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Sample records for caracterizacao clinica radiografica

  1. Clinical, radiographic and scintigraphic aspects of the trapeziometacarpal osteoarthritis; Caracterizacao clinica, radiografica e cintilografica da osteoartrose trapeziometacarpiana

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    Kaziyama, Helena Hideko Seguchi

    1996-12-31

    Trapeziometacarpal osteoarthritis occurs mainly in women during the menopausal period. It is related to manual activities and is usually bilateral. The onset is insidious and the evolution is slow and progressive. It is characterized by of strength and pain in the basis of the thumb resulting in limitation of the use and function of the hand. The diagnosis of this condition is based on the physical examination. The manouver of compression axial-rotation of the trapezimetacarpal joint is a common positive finding. Typical findings of osteoarthritis are present in the radiological studies. Scintigraphic images have a predictive value. The early diagnosis is important to avoid the risk factors and to prevent disabilities of the hand. (author) 102 refs., 18 figs., 10 tabs.

  2. Possibilities of radiographic digitalisation in dental clinics; Possibilidades de digitalizacao radiografica na clinica odontologica

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    Zenobio, Madelon A.F. [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN), Belo Horizonte, MG (Brazil); Zenobio, Elton Goncalves [Pontificia Univ. Catolica de Minas Gerais, Belo Horizonte, MG (Brazil)

    2002-07-01

    In the evolution diagnostic processes by image, the improvement of the intrabucal radiographic sensibility generated and digitalized is today, of great expressiveness in the evolution and effectiveness in the odontological area. This methodology applicability as a possibility of a more precise and accurate diagnostic formulation among other advantages, justifies this technique use. This paper intends to, thorough the literature magazine and clinic case presentations to show its applicability in the daily odontological clinic, and specially, in the periodonty area. (author)

  3. Acta Clinica Croatica: napredak korak po korak

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    Ramljak, Gordana

    2014-01-01

    Časopis Acta Clinica Croatica počeo je izlaziti 1962. godine na hrvatskom jeziku pod nazivom Anali Bolnice Dr. M. Stojanović. Godine 1995. naziv časopisa se mijenja u današnji, a svi radovi se objavljuju na engleskom jeziku. Godine 2000. objavljuje se i mrežna (online) verzija. U radu se prati razvoj časopisa od 1962. do 2012. godine temeljem analize vrste i broja radova, broja citata te broja domaćih i stranih autora u indeksnoj i citatnoj bazi SCOPUS (u tri razdoblja). Isti su parametri ana...

  4. An evening at "La Clinica del Pueblo".

    Science.gov (United States)

    Shefsky, M L

    1986-01-01

    This article describes a typical evening at the Clinica del Pueblo in the Hispanic neighborhood of Adams-Morgan in Washington, D.c. The Clinical del Pueblo began operating in 1983 in response to the urgen medical needs of Central American refugees arriving in the Washington D.c. area. The refugees bring with them severe trauma, fear, and health problems caused by the civil was and exacerbated by inadequate or non-existant health services. Approximately 80,000 Salvadoran refugees live in the area. They do not receive adequate health care for 3 reasons. 1) Because the US goverment is unwilling to recognize them as true refugees, they live with the constant threat of deportatin back to the violence from which they have fled. 2) Refugees lack the ability to pay for private care. 3) Langauage and culture create frightening barriers to health care for the refugees. For those who do seek care, these barriers can lead to the inadequate or incomplete diagnoses and poor compliance and follow-up. Plenty International and the Central American Refugee Center responded to these problems by organizing a free clinic to provide not only medical care but also a training course for volunteers. The director of the clinic organizes the course, the classes are taught by a variety of people including the clinic's volunteer physicians, nurses, and public health educators as well as graduates of previus training courses and people from the wider community. The services of the clinic reach only a small portion of the population in need. However, the fact that free medical services are now available to some Central American refugees make the Clinica del Pueblo an important program.

  5. The first century of the "clinica del lavoro" in Milan.

    Science.gov (United States)

    Bertazzi, Pier Alberto; Foà, Vito

    2005-01-01

    The Clinica del Lavoro was created in Milan at the beginning of the 20th century by Luigi Devotto, who deemed it essential for physicians and health researchers to get involved in the life and health problems of working populations. The main roles of the Clinica del Lavoro were to educate medical students and train physicians; study actual workplaces, examine health and safety hazards and their noxious effects; and create initiatives and services to protect and promote workers' health. Important scientific contributions were made in several fields, including chemical carcinogenesis, effects of mineral and biologicalfibers, mechanism of action of silica dust, methods for the detection and measurements of toxic substances in both the work environment and workers' biological media.

  6. Book review. Semeiologia Clinica Veterinaria. (a cura di Paolo Ciaramella

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    Manuel Graziani

    2014-09-01

    Full Text Available Il grado di specializzazione raggiunto nel settore clinico veterinario non è dissimile da quello presente in campo umano, soprattutto se si pensa agli animali d'affezione che sono oramai considerati parte integrante di una società moderna e civile in cui anche il fattore benessere animale ha acquisito importanza non secondaria, in particolare nell'allevamento degli animali da reddito. In questo contesto è sempre più richiesta la figura di uno specialista competente e aggiornato, in grado di risolvere in modo adeguato le problematiche che gli vengono proposte, in un mercato in concorrenza che non contempla imperizia, inesperienza e ignoranza professionale. Lo studio della semeiologia clinica è uno dei primi passi di questo lungo e affascinate cammino che permette di apprendere un metodo di analisi sistematico, affidabile, efficiente e accurato per educare il futuro medico veterinario verso le procedure della buona pratica clinica. La semeiotica insegna ad allenare i propri sensi: a guardare attraverso l'osservazione diretta e indiretta, a sentire ascoltando suoni o rumori, a percepire sensazioni tattili e, non da ultimo, a saper discernere con cognizione e competenza quando ricorrere alle indagini strumentali e di laboratorio; sempre e comunque nella consapevolezza che non possono in nessun modo sostituire l'esame fisico diretto del paziente. Paolo Ciaramella, professore ordinario di Clinica Medica Veterinaria all'Università Federico II di Napoli, presenta così il volume che ha curato: "L'idea di questo libro ha preso forma durante un simposio di medicina interna tenutosi a Torino nel 2008. Con alcuni colleghi presenti si pensò alla possibilità di elaborare un nuovo testo di Semeiotica Medica che potesse ampliare e aggiornare il glorioso Messieri e Moretti, non tanto perché esso avesse perduto il suo valore intrinseco, quanto piuttosto perché nel corso degli anni sono cambiate la patologia animale e con essa la semeiotica e la clinica

  7. Acta Clinica Croatica: progress of a journal step by step.

    Science.gov (United States)

    Ramljak, Gordana

    2014-03-01

    The journal Acta Clinica Croatica (ACC) was founded in 1962 under the title Anali Bolnice Dr. M. Stojanović. In 1995, the title of the journal was changed into its present form and ever since all papers have been published in English. In 2000, the electronic (online) edition of the ACC was released in addition to the print version. The paper presents development of the journal from 1962 to 2012 based on the analysis of the following SCOPUS citation index parameters: type and number of documents published in the journal; number of citations; and number of domestic and foreign authors. The studied period was analyzed in three time segments: the period from 1995 to 1999, the period from 2000 to 2006 and the period from 2007 to 2012. The same parameters were analyzed in the Web of Science/SCI-Expanded bibliographic and citation index for the 2007-2012 period. The increasing number of documents, authors (both domestic and foreign) and citations demonstrates gradual rise in the quality, visibility and impact of the journal. The fifty years of experience show that a goal, at first very distant and almost unachievable, may be reached by progressing step by step.

  8. Oncology patients hospitalized in the Clinicas Hospital Dr. Manuel Quintela

    International Nuclear Information System (INIS)

    This work was carried out by a nursery licensed group in the Clinicas Hospital - Dr. Manuel Quintela.The nature and functioning of Services and the allocation of resources, are essential for the analysis of the Survey of the hospitalized oncology patients in the Institution. To develop a model of care that constitutes a health care as well as teaching and research in the country regarding the quality of care was defined the following topics: lower risks for the patient, safer care, personal trained and specialized to promote relationship between the offering and the person receiving the service. The assessment and management performance of the services involved in the operation are the result of the degree of user satisfaction. Objective: To determine the human and material necessary for the care of cancer resources users, considering their number, treatment, complications and nursing care derived from each pathology and stage of disease. Methodology: A comparative descriptive study of the same population was conducted in two transverse sections in relation to two different times which are based on the design of a form that allowed hospitalized to collect information on users 6/12/03 and 6/16/04. Other instruments used were the clinical history and the daily census staff Patients and Nursing Division. Results and conclusions: A comparative descriptive analysis already mentioned are: increased internships and cancer patients; between 50 and 64 is the highest number of patients; diagnoses Face and Neck and maintain the Digestive System more cases; the number of patients doubles and Hematology Neurological from one to another period. Chemotherapy is the treatment choice and there is a decrease in the surgical and medical; more patients in the study; in the origin, Montevideo has the largest number of patients followed by Canelones. Line of nursing intervention will be carried out in short, medium and long term

  9. Characterization for DRX and FTIR of the surface of UWMWPE for critical applications; Caracterizacao por DRX e FTIR da superficie PEUAPM do para aplicacoes clinicas

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    Medeiros, Keila M. de; Araujo, E.M.; Lira, H.L., E-mail: keilamm@ig.com.b [Universidade Federal de Campina Grande (UAEMat/UFCG), PB (Brazil). Unidade Academica de Engenharia de Materiais; Patricio, Aline C.L.; Lima, Carlos A.P. de [Universidade Estadual da Paraiba (DQ/UEPB), Campina Grande, PB (Brazil). Dept. de Quimica

    2009-07-01

    Biomaterials is the result of the application of the science of the materials to the medicine, understands a new and important spectrum of the knowledge - Science of Biomaterials. The principal aspects that determine the acting of a bio material in the human body are three: biocompatibility, mechanical properties and degradation. This work had the objective to modify and to oxidate the surface of ultra-high molecular weight polyethylene (UHMWPE). It was utilized for this modification water sandpapers and for oxidation the hydrogen peroxide (H{sub 2}O{sub 2}). The surface of UHMWPE it was modified with water sandpapers of numbers 180, 600 and 1200 mesh and oxidated with the H{sub 2}O{sub 2} in different concentrations of 35 and 60%. The samples already with its modified surfaces had been submitted to the characterization using itself the following techniques: diffraction de ray-X and Fourier transform infra-red spectroscopy. The physical modification (sanded) and chemistry (H{sub 2}O{sub 2}) of the surface of UHMWPE was important because it looks for improving the interaction techniques of the implants with the bone. (author)

  10. Construction of a homogeneous phantom for radiographic image standardization; Construcao de um fantoma homogeneo para padronizacao de imagens radiograficas

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    Pina, Diana Rodrigues de

    1996-12-31

    The principle of radiodiagnosis consists in the fact the X-ray beam is attenuated at different degrees by distinct tissues. For this reason, the anatomical structures have distinct radiological opacities, that produce the radiographic image. The progresses in radiology are related to the development if new radiographic image formation systems that enable an amplification in the quality, with low dose and/or risk to the patient. The objective of this work is the sensitometric valuation of a screen-film combination, that is still the most used, for the standardization, of radiographic images. Thinking about this, were constructed homogeneous phantoms of the chest, skull and pelvis, for the calibration of X-ray beams, with the purpose of obtaining radiographic images of good quality, basing in the routine of a radiodiagnosis service and in the scientific knowledge. Questions were approached about the choice of the suitable equipment, that allow the obtention of k Vp and m As combinations, to produce radiographic images of good quality, and the reproduction of these combinations to any conventional equipment of diagnostic X-rays. Also presented are the comparison of the doses imparted by these combinations and those used in routine of the Hospital das Clinicas da Faculdade de Medicina de Ribeirao Preto`s radiodiagnosis service. (author) 24 refs., 27 figs., 12 tabs.

  11. OC ToGo: bed site image integration into OpenClinica with mobile devices

    Science.gov (United States)

    Haak, Daniel; Gehlen, Johan; Jonas, Stephan; Deserno, Thomas M.

    2014-03-01

    Imaging and image-based measurements nowadays play an essential role in controlled clinical trials, but electronic data capture (EDC) systems insufficiently support integration of captured images by mobile devices (e.g. smartphones and tablets). The web application OpenClinica has established as one of the world's leading EDC systems and is used to collect, manage and store data of clinical trials in electronic case report forms (eCRFs). In this paper, we present a mobile application for instantaneous integration of images into OpenClinica directly during examination on patient's bed site. The communication between the Android application and OpenClinica is based on the simple object access protocol (SOAP) and representational state transfer (REST) web services for metadata, and secure file transfer protocol (SFTP) for image transfer, respectively. OpenClinica's web services are used to query context information (e.g. existing studies, events and subjects) and to import data into the eCRF, as well as export of eCRF metadata and structural information. A stable image transfer is ensured and progress information (e.g. remaining time) visualized to the user. The workflow is demonstrated for a European multi-center registry, where patients with calciphylaxis disease are included. Our approach improves the EDC workflow, saves time, and reduces costs. Furthermore, data privacy is enhanced, since storage of private health data on the imaging devices becomes obsolete.

  12. [The role of the "Clinica del Lavoro Luigi Devoto" in international research].

    Science.gov (United States)

    Bertazzi, P A; Forni, Alessandra M

    2003-01-01

    During its long history, the Clinica del Lavoro Luigi Devoto has produced numerous internationally recognized scientific contributions in the specific field of occupational medicine and health, and in other broader areas as, for example, immunology, toxicology, cytogenetics. Pivotal in this activity was the figure of Enrico C. Vigliani, director of the Clinica for over 35 years. We mention here, in particular, the results of the study of "early" markers of lead intoxication; the research on the carcinogenicity of benzene and aromatic amines; the study of the pathogenesis of silicosis and byssinosis; the study of cytogenetic damage after exposure to industrial toxic chemicals; the technical research for dust abatement in mines. Such research also played a major role in the development of pulmonary medicine, toxicology and immunology in Italy, and conferred scientific dignity on the newborn "industrial hygiene" discipline thanks to the work of Nicola Zurlo. Today, the Clinica's research is maintained at international standards especially by the work of thematic Research Centers recently established within the Clinica, covering fields such as occupational and environmental toxicology, occupational oncology, ergonomics, respiratory disease and allergy, psycho-social risk factors. These Centers are also devoted to the development of innovative methods in epidemiology, toxicology, psychology, molecular biology, and ergonomic measurement for the identification and evaluation of health risks at work.

  13. Evaluation of skin entry kerma in radiological examinations at the Hospital de Clinicas, Parana, Brazil

    International Nuclear Information System (INIS)

    This paper evaluates the skin entry dose of pediatric and adults patients when submitted to radiological examinations at the Hospital de Clinicas do Parana, Brazil, as part integrate of the data assessment of International Atomic Energy Agency (IAEA) for Latin America. It was performed measurements of dose for evaluation of skin entry kerma in pediatric patients in thorax AP/PA examinations, adults of thorax in AP/PA, cranio caudal mammography and median lateral and patients of computerized tomography in examination of head, thorax and abdomen. The obtained data demonstrate the necessity of verification of diagnostic analysis standards. The great value amplitudes demonstrate the incompatibility of examination executions with those recommended by the literature. The dose values presented partially inside the range recommended and the other over the expected for the due examination when compared with the literature

  14. Neurosurgical experience with tumours of the pineal region at Clinica Puerta de Hierro.

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    Vaquero, J; Ramiro, J; Martínez, R; Bravo, G

    1992-01-01

    The clinicopathological experience with 50 cases of pineal region tumours at Clinica Puerta de Hierro is presented. In this series, 88% of the patients were evaluated by CT-scan. Pineal region tumours make up approximately 0.7% of the intracranial expansive processes in the Spanish population. The largest group of lesions appearing in this localization is that of the germinomas (38%), followed by nontumoural lesions (20%) and tumours generally considered to be of the vicinity, such as meningiomas, gliomas and metastases (18%), tumours of the pineal parenchyma (14%), and non-germinoma germinal tumours (10%). In our series, in addition to an intracranial hypertension syndrome, an ophthalmological and, to a minor degree, an endocrinological syndrome predominate in germ-cell tumours, with a cerebellar syndrome appearing in gliomas of the pineal region. All the patients in the series diagnosed as having a germinoma and treated by irradiation are alive, and free of disease, after follow-up ranging from 2 to 20 years (mean: 8 years). The experience obtained with the present series supports the opinion that, in radiosensitive tumours, surgical resection adds no therapeutic benefit to treatment with radiotherapy alone. We suggest that when dealing with a tumour of the pineal region, CT-scan and clinical assessment now permit an initial selection of patients susceptible to surgery as a first therapeutic option, indicating those patients who, because they are considered to have either a "probable germinoma" or a "tumour of uncertain diagnosis", should undergo stereotaxic biopsy or trial radiotherapy and, only when this has proved a failure, should be subjected to open surgery.

  15. Automated Import of Clinical Data from HL7 Messages into OpenClinica and tranSMART Using Mirth Connect.

    Science.gov (United States)

    Camacho Rodriguez, Juan Carlos; Stäubert, Sebastian; Löbe, Matthias

    2016-01-01

    Electronic data capture (EDC) tools are designed to simplify data acquisition, improving data quality and managing clinical data electronically. Some data are collected from the laboratory information management system (LIMS), which is an important data source for a study. OpenClinica is an open source clinical data management system (CDMS) for web-based electronic data capture (EDC), which is used widely in academic clinical research. TranSMART is also an open source web-based platform used for the management and analysis of different data types common in clinical and translational research. Many LIMS use the Health Level 7 standard - Version 2.x (HL7) as a message exchange protocol. In this paper, we implement Mirth Connect as a Communication Server (CS) to convert these HL7 messages either to Operational Data Model (ODM) data for the automatic import in OpenClinica or tabular-delimited text format files, whose data is uploaded in tranSMART using the tMDataLoader tool. PMID:27577395

  16. Evaluation of skin entry kerma in radiological examinations at the Hospital de Clinicas, Parana, Brazil; Avaliacao de kerma de entrada na pele em exames radiologicos no Hospital de Clinicas do Parana, Brasil

    Energy Technology Data Exchange (ETDEWEB)

    Porto, Lorena E.; Schelin, Hugo R.; Santos, Amanda C. dos; Bunick, Ana Paula; Paschuk, Sergei; Denyak, Valeriy [Universidade Tecnologica Federal do Parana (UTFPR), Curitiba, PR (Brazil); Tilly Junior, Joao G. [Universidade Federal do Parana (UFPR), Curitiba, PR (Brazil). Hospital de Clinicas; Khoury, Helen J., E-mail: khoury@ufpe.b [Universidade Federal de Pernambuco (UFPE/DEN), Recife, PE (Brazil). Dept. de Energia Nuclear

    2011-10-26

    This paper evaluates the skin entry dose of pediatric and adults patients when submitted to radiological examinations at the Hospital de Clinicas do Parana, Brazil, as part integrate of the data assessment of International Atomic Energy Agency (IAEA) for Latin America. It was performed measurements of dose for evaluation of skin entry kerma in pediatric patients in thorax AP/PA examinations, adults of thorax in AP/PA, cranio caudal mammography and median lateral and patients of computerized tomography in examination of head, thorax and abdomen. The obtained data demonstrate the necessity of verification of diagnostic analysis standards. The great value amplitudes demonstrate the incompatibility of examination executions with those recommended by the literature. The dose values presented partially inside the range recommended and the other over the expected for the due examination when compared with the literature

  17. Comparative study of bridge plate associated to the intramedullary pin and the dynamic compression plate on the experimental osteotomy fixation of femoral in rabbits (Oryctolagus cuniculus). Clinical, radiographic, histological and scintigraphy analyses; Estudo comparativo da placa em ponte associada ao pino intramedular e da placa de compressao dinamica na fixacao de osteotomia experimental em femur de coelhos (Oryctolagus cuniculus). Analises clinica, radiografica, histologica e cintilografica

    Energy Technology Data Exchange (ETDEWEB)

    Borges, Natalie Ferreira

    2011-07-01

    The objectives were to benchmark and monitor the fracture healing of femoral osteotomy in rabbits after fixation with dynamic compression plate and bridge plate associated with intramedullary pin. Were used 14 New Zealand rabbits, four months old with mean weight of 3.5 pounds, from the Experimental Farm Professor Helio Barbosa of the Veterinary School of Minas Gerais Federal Univ. (UFMG). The animals were randomly divided into two groups (I and II). All rabbits underwent osteotomy across the middle third of right femur. In the group I was made to fix the osteotomy with the bridge plate (BP) associated with intramedullary pin, introduced the technique of minimal invasion. In group II, we used dynamic compression plate (DCP) via the conventional approach. Both groups were evaluated clinical, radiographic, histologic and scintigraphic findings. Clinical assessments were performed weekly until the 12{sup th} postoperative week and radiographic examinations were performed before, immediately after, at 15, 30, 45, 60 and 90 days. The bone scintigraphy were performed before and at 20, 50 and 90 days after surgery to monitor the bone metabolism qualitatively and quantitatively. Observed perfusion and bone healing process. After 90 days of study, there was histopathologic evaluation of the osteotomized area and the insertion of screws. In the region of the osteotomy was observed predominance of trabecular bone in group I and group II, the predominance of bone osteons, compatible with the original bone. On insertion of the screws did not differ between groups and there was cortical discontinuity, little necrosis and local hemorrhage. The two types of fixation have led to consolidation within the scheduled period, maturing in early fixation with DCP fixation compared with BP. Scintigraphy demonstrated by the indices of activity and image characteristics, the process of bone healing was significantly greater in animals undergoing early fixation with DCP. (author)

  18. La clinica parapsicologica

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    Evrard Renaud

    2007-09-01

    Full Text Available Gli ultimi due decenni hanno visto nascere una disciplina nuova: l'accoglienza e il sostegno psicologico delle persone che vivono esperienze eccezionali. Avere l'impressione di vivere in una casa abitata, testimoniare l’apparizione di OVNI, interrogarsi sulle possibilità di influenze telepatiche o anche conservare per sé la sensazione irreale di uscire “fuori dal corpo”, sono alcuni esempi di ciò che provano queste persone. L'eterogeneità di queste testimonianze le classifica spesso nella categoria delle "esperienze vissute come paranormali". Se tali resoconti sono sempre pervenuti agli esperti, si deve ai recenti lavori di ripristino dell'ascolto di queste persone.

  19. La clinica parapsicologica

    OpenAIRE

    Evrard Renaud

    2007-01-01

    Gli ultimi due decenni hanno visto nascere una disciplina nuova: l'accoglienza e il sostegno psicologico delle persone che vivono esperienze eccezionali. Avere l'impressione di vivere in una casa abitata, testimoniare l’apparizione di OVNI, interrogarsi sulle possibilità di influenze telepatiche o anche conservare per sé la sensazione irreale di uscire “fuori dal corpo”, sono alcuni esempi di ciò che provano queste persone. L'eterogeneità di queste testimonianze le classifica spesso nella cat...

  20. Verso una pedagogia clinica

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    Giancarla Sola

    2010-07-01

    Full Text Available The author begins by posing a question: What does it mean to speak of clinical teaching, moving from an analysis covering his bases? Then offers a possible answer: first, it means trying to understand what is at the basis of clinical teaching, or what funds this knowledge. It is therefore to investigate the concepts advance the fundamentals of this science, forming and supporting his research, his criticism, his speech. This is necessary to understand how scientific education is born and takes shape in a more practical and problematic context, always in relation with the many dimensions of the subject.

  1. Maternal and perinatal results of preeclamsia before 31 weeks of gestation at clinica maternidad Rafael calvo cartagena, colombia

    Directory of Open Access Journals (Sweden)

    Mogollon-Saker Sandra Patricia

    2011-12-01

    Full Text Available Hypertensive disorders in pregnancy are associated to a high rate of maternal andperinatal morbidity and mortality.Objective: To describe maternal and perinatal results in pre-eclamptic women withdelivery before 36 weeks of gestation.Methods: A retrospective, descriptive, study to assess maternal and perinatal results inpre-eclamptic women with delivery before 36 weeks of gestation, at ClinicaMaternidadRafael Calvo between January and December 2009.Results: Clinical charts of 47 patients and 43 products were analyzed. There were fourstillbirths. Maternal findings: mean age was 24 years, mean gestational age was 31weeks, 55% had parity >1, 49% had no prenatal control, 56% received corticosteroidsfor pulmonary maturation, and the more frequent complication was abruption placentae(13%. Cesarean delivery was most frequent. 14% required intermediate critical carefor hemodynamic monitoring. No maternal death occurred. Neonatal findings: averagebirth weight was 1602 grams, average Apgar at 1’ was 6 and 5’ was 8. 86% of babiesrequired neonatal critical care (NICU. Mean length of stay at NICU was 18 days. Themost frequent morbidity was respiratory distress secondary to hyaline membranedisease (50%. Besides, this syndrome was first cause of neonatal mortality. Neonatalmortality was 19%.Conclusion: Severe preeclampsia before 36 weeks of gestation increases the ratesof maternal and perinatal morbidity and mortality. Expectant management can berecommended case by case under medical criteria.. A close monitorizationand maternaland neonatal critical care infrastructure is needed to support these patients.RESUMEN:Los trastornos hipertensivos del embarazo están asociados a altas tasas de morbilidady mortalidad materna y perinatal.Objetivos: Describir los resultados materno perinatales obtenidos en las pacientes conpreeclampsia severa lejos del término.Metodología: Se realizo estudio retrospectivo, descriptivo, para evaluar los resultadosobtenidos y

  2. [The scientific progress of the "Clinica del Lavoro Luigi Devoto" as seen through the contents of the journal "La Medicina del Lavoro". ].

    Science.gov (United States)

    Foà, V; Camerino, Donatella

    2003-01-01

    On occasion of the Centenary of the "Clinica del Lavoro Luigi Devoto", its researchers suggested that awareness of its historical identity and scientific development should constitute the basis for the future of the Institution. The directors of the Institute who have succeeded one to the other over the years have left a vivid report of the vast amount of work developed in several research fields and also of the original results achieved with significant impact on the scientific community and on society. Content analysis of "La Medicina del Lavoro" allowed us to shed light on strong bonds existing between manufacturing techniques, work organization and health, in the different political and social periods in which they developed. Many actions have been defined and several research subjects have been renewed (according to current demands and new methodological possibilities) between the past and the present, nevertheless many new approaches need to be taken in the fields of epidemiology, indoor air quality, ergophthalmology, muskuloskeletal disorders, environmental and molecular toxicology, and further research will be undertaken thanks to the potential of this discipline for the future. The aim of this report is also to express our thanks to all the medical and non-medical staff who have made their contribution over 100 years of engagement.

  3. [The centenary of the founding of the "Clinica del Lavoro Luigi Devoto" in Milan (1902-2002). The oldest health organization in the world for the study, treatment, and prevention of occupational diseases].

    Science.gov (United States)

    Grieco, A

    2003-01-01

    The foundation of the Clinica del Lavoro by Luigi Devoto cannot be dated back to the specific date of an event or, worse, to the official inauguration as has happened so far. It can rather be considered as a process started on November 20, 1902 (date of the first resolution by the Milan Municipality Council), continuing with the national law n. 365 of July 9, 1905, then with the laying of the first stone on December 11, 1907 bearing the motto of the Milanese School "In aliis vivimus, movemur et sumus" and finally the official inauguration on March 20, 1910. The Founder Luigi Devoto was born in 1864 at Borzonasca (Genoa) and took a degree of medicine and surgery at the Genoa University in 1888. After a period in Prague and then in Genoa, he was appointed temporary teacher of medical pathology in Pavia. He published several scientific contributions in different fields of occupational health (lead intoxication, ankylostomiasis, strain cardiopathy, etc.) and in other branches (tuberculosis, pellagra, etc.) that he considered as indirectly work-related diseases. He died in Milan in 1936. Three issues characterize the ingenious intuition of Luigi Devoto and his thirty-year direction of the Clinica del Lavoro: 1. Full respect for the principles of discipline and scientific method suggested by Bernardino Ramazzini; 2. The extremely broad conception of the diseases that had to be considered as "workers' diseases"; 3. The constant social attention towards the application of scientific knowledge also through workers' information and updating of regulations to improve working conditions. Many of the conflicts and events associated with the foundation of the Clinica del Lavoro can be summarized in the name chosen by the Founder. Actually to those asking why "Clinic of Work" and not "Clinic of Workers", Devoto used to reply that it was work that was ill and therefore it was necessary to treat the work to prevent workers' illnesses.

  4. [The preparation and characterization of fine dusts carried out in the Clinica del Lavoro di Milano in support of experimental studies].

    Science.gov (United States)

    Occella, E; Maddalon, G; Peruzzo, G F; Foà, V

    1999-01-01

    This paper aims to illustrate the conditions selected at the Clinica del Lavoro of the University of Milan to prepare and analyze a large number of fine dust samples produced over a period of about 50 years, that were initially used for studies within the Clinic performed in its own facilities, and since 1956 were sent to other Italian and overseas laboratories (Luxembourg, UK, Germany, Norway, Sweden, South Korea, USA). The total quantity of material distributed (with maximum size 7-10 microns) was about 2 kg and consisted of the following mineral and artificial compounds: quartz, HF-treated quartz, tridymite, HF-treated tridymite, cristobalite, chromite, anthracite, quartz sand for foundry moulds, sand from the Lybian desert, vitreous silica, pumice, cement, as well small quantities of metallic oxides, organic resins, chrysotile, crocidolite, fibres (vitreous, cotton and polyamidic). About half of the entire quantity of dusts produced consisted of partially HF-treated tridymite. Initially, research on the etiology of silicosis used quartz dust samples, simply sieved or ventilated (consisting of classes finer than 0.04 mm, containing a 15-20% respirable fraction). From 1956 to 1960 the dusts were produced by manual grinding in an agate mortar, below about 10 microns, starting from quartz from Quincinetto (near Ivrea, Province of Turin), containing about 99.5% quartz: particle size and composition were checked using an optical-petrographic technique, with identification of the free and total silica content. Subsequently, the dusts used for biological research were obtained by grinding coarse material with a cast iron pestle and planetary mills, agate and corundum jars. The grinding products were sized by means of centrifugal classification, using the selector developed by N. Zurlo, ensuring control of dust size both optically and by means of wet levigators and hydraulic classifiers (in cooperation with the Institute of Mines of Turin Polytechnic School). After 1990

  5. Clinical manifestations of peripheral nervous system involvement in human chronic chagas disease Manifestaciones clinicas de compromiso del sistema nervioso periférico en el estádio crônico de la enfermedad de Chagas

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    Osvaldo Genovese

    1996-06-01

    Full Text Available We conducted a clinical and electromyographical study in patients with Chagas' disease in the indeterminate or chronic stages of the illness. Altogether 841 patients were examined. Only 511 were admitted within the protocol; the remainder patients were rejected because they showed other causes able to damage the nervous system. Fifty two (10.17% out of the 511 patients showed signs and symptoms of peripheral nervous system involvement in the form of sensory impairment and diminished tendon jerks suggesting the presence of neuropathy. Forty five of them were submitted to a conventional electromyographical examination. Fifteen of mem showed normal results, while the remainder 30 disclosed a reduced interference pattern, being most of the remaining motor unit potentials fragmented or poliphasic, reduced sensory and motor conduction velocities and diminished amplitude of the sensory action potential. The findings suggest that some chagasic patients in the indeterminate or chronic stages of the disease may develop a clinical mild sensory-motor peripheral neuropathy.El estúdio presente fue diseftado con ei objeto de pesquizar Ia existência de manifestaciones clinicas en pacientes afectados por enfermedad de Chagas, en estádio indeterminado o crônico, que tuviesen, ai menos, 2 reacciones serologicas positivas. En total fueron examinados 841 enfermos. De ellos solo 511 fueron admitidos en ei protocolo; los restantes fueron rechazados por mostrar Ia presencia de otras causas que hubiesen podido danar su sistema nervioso. Dentro de los 511 pacientes admitidos, 52 (10.17% evidenciaron alteraciones objetivas y subjetivas de Ia sensibilidad y disminucion de los reflejos osteotendinosos. Estos signos y sintomas, que sugieren la presencia de neuropatia, podian combinarse de diferente manera. Como complemento dei examen clinico, se efectuo estúdio electromiografico convencional en 45 de estos pacientes. En 15 los hallazgos fueron normales, en tanto que en

  6. Mastite clinica caprina causada por Arcanobacterium pyogenes

    OpenAIRE

    F. Garino Jr; R.A.T. Matos; E.G Miranda Neto; J.N.N. Bernardino; E.D. Santos; G.M.N. Aguiar

    2012-01-01

    This paper reports the occurrence of goat mastitis due to Arcanobacterium pyogenes in Paraiba State - Brazil. The diagnosis was confirmed by clinical symptoms and microbiological culture. Amastectomywasperformedasclinical treatment.

  7. Mastite clinica caprina causada por Arcanobacterium pyogenes

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    F. Garino Jr

    2012-08-01

    Full Text Available This paper reports the occurrence of goat mastitis due to Arcanobacterium pyogenes in Paraiba State - Brazil. The diagnosis was confirmed by clinical symptoms and microbiological culture. Amastectomywasperformedasclinical treatment.

  8. Dialogo tra Epistemologia Clinica ed Epistemologia antropologica

    Directory of Open Access Journals (Sweden)

    Maurizia Tinti

    2013-12-01

    Full Text Available Il viaggio può assumere funzioni diverse se osservato all’interno delle discipline psicoterapeutica e antropologica: da un lato è un tipo di cura, mentre dall’altro permette lo studio di culture altre. Questo confronto introduce la comparazione tra l’esperienza della follia e quella della cultura, analizzate attraverso lo sguardo critico di Foucault e della critica post-moderna in antropologia. Esperienze, queste, che hanno in comune il fatto di essere il prodotto di discorsività “scientifiche”, positiviste, che hanno assunto un certa autorità nel parlare di determinate alterità – il medico con il “suo” folle e l’antropologo con il “suo” selvaggio –, e che sono state esperite lungo la storia delle due discipline, particolarmente in età moderna, quando stabilirono il loro apparato epistemologico e metodologico. Con la post-modernità, si realizzò quindi una svolta epistemologica secondo cui il ricercatore e l’analisi da lui prodotta non possono essere oggettivi: tanto la soggettività dello studioso quanto quella dell’oggetto di analisi contribuiscono a modificare il contesto e l’interazione tra i soggetti. La psicoterapia e l’antropologia verranno quindi considerate sul piano fenomenologico, e la produzione di sapere diverrà polifonica e condivisa.

  9. Dialogo tra Epistemologia Clinica ed Epistemologia antropologica

    OpenAIRE

    Maurizia Tinti

    2013-01-01

    Il viaggio può assumere funzioni diverse se osservato all’interno delle discipline psicoterapeutica e antropologica: da un lato è un tipo di cura, mentre dall’altro permette lo studio di culture altre. Questo confronto introduce la comparazione tra l’esperienza della follia e quella della cultura, analizzate attraverso lo sguardo critico di Foucault e della critica post-moderna in antropologia. Esperienze, queste, che hanno in comune il fatto di essere il prodotto di discorsività “scientific...

  10. Workshop Euratom Directive 97/43. New trends in radiation protection in clinical practice, in research and in regulation; Giornata di studio La Direttiva Europea 97/43: nuovi orientamenti per la radioprotezione nella pratica clinica, nella ricerca e nel quadro normativo

    Energy Technology Data Exchange (ETDEWEB)

    Mazzei, F. [ed.] [Istituto Superiore di Sanita' , Rome (Italy). Lab. di Fisica

    1999-07-01

    The Euratom Directive 97/43 on health protection of individuals against the dangers of ionizing radiation in relation to medical exposure is presented. In particular the following topics are focused, with a multidisciplinary approach, on: diagnostic reference levels in radiodiagnostics and nuclear medicine; radiation protection in paediatrics, in interventional radiology and in computer tomography; radiation protection radiotherapy, radiation protection in medical research; radiation protection in prenatal and neonatal exposure; radiation protection in medical-legal exposures. [Italian] Il rapporto raccoglie una presentazione della Direttiva Euratom 97/43 riguardante la protezione sanitaria delle persone contro i pericoli delle radiazioni ionizzanti connessi a esposizioni mediche. In particolare sono affrontati in modo interdisciplinare i seguenti argomenti: livelli diagnostici di riferimento in radiodiagnostica e in medicina nucleare; radioprotezione nelle esposizioni in eta' pediatrica, in radiologica interventistica e in tomografia computerizzata; radioprotezione in radioterapia; radioprotezione nella ricerca scientifica clinica; radioprotezione nell'esposizione in eta' prenatale e neonatale; esposizioni potenziali e radioprotezione nelle esposizioni medico-legali.

  11. Individualization of radiographic techniques in computerized radiology; Individualizacao das tecnicas radiograficas em radiologia computadorizada

    Energy Technology Data Exchange (ETDEWEB)

    Abrantes, M.E.S.; Oliveira, A.H. de, E-mail: marcosabrantes2003@yahoo.com.br [Universidade Federal de Minas Gerais (DEN/UFMG), Belo Horizonte, MG (Brazil). Departamento de Engenharia Nuclear; Feliz, W.F.; Stoppa, L.G.; Paiva, O.A. [Universidade Federal de Minas Gerais (UFADTI/UFMG), Belo Horizonte, MG (Brazil). Hospital das Clinicas. Unidade Funcional Apoio Diagnostico e Terapeutica por Imagem; Oliveira, G.A.P. [Universidade Federal de Minas Gerais (DEN/UFMG), Belo Horizonte, MG (Brazil). Departamento de Anatomia e Imagem

    2015-07-01

    This work aims to produce information for image quality implementation in a radiology sector based on previous assessments of the images by questionnaires, acceptance and quality, as step of recognition of the parameters used in radiographic techniques. After this research data raised were divided into male group, female, PA and PF thickness, body mass index, type of biotypes, anthropomorphic parameters, body evaluation associated with the constant tension and additional filtration. The results show the predominance of the 35 and 40 constant with additional filtering from 0.5 to 1.5 mmAl, voltage for male gender (PA PF) 86-92 kV and 96-112 kV voltage for female gender of 85-98 kV and 96-112 kV, respectively. The load applied to the tube for males (PA and PF) is between 5-10 and 5-16 mA.s mA.s and for females (PA and PF) is between 6.3 to 8 mA.s and 9-14 mA.s.

  12. Isolation of Pseudomonas aeruginosa strains from dental office environments and units in Barretos, state of São Paulo, Brazil, and analysis of their susceptibility to antimicrobial drugs Isolamento de cepas de Pseudomonas aeruginosa provenientes do meio ambiente e de equipos dentarios em clinicas dentarias em Barretos, São Paulo, Brasil; analises da susceptibilidade das cepas a drogas antimicrobianas

    Directory of Open Access Journals (Sweden)

    Ana Claudia de Oliveira

    2008-09-01

    Full Text Available A wide variety of opportunistic pathogens has been detected in the tubing supplying water to odontological equipment, in special in the biofilm lining of these tubes. Among these pathogens, Pseudomonas aeruginosa, one of the leading causes of nosocomial infections, is frequently found in water lines supplying dental units. In the present work, 160 samples of water, and 200 fomite samples from forty dental units were collected in the city of Barretos, State of São Paulo, Brazil and evaluated between January and July, 2005. Seventy-six P. aeruginosa strains, isolated from the dental environment (5 strains and water system (71 strains, were tested for susceptibility to six antimicrobial drugs most frequently used against P. aeruginosa infections. Susceptibility to ciprofloxacin, followed by meropenem was the predominant profile. The need for effective means of reducing the microbial burden within dental unit water lines is emphasized, and the risk of exposure and cross-infection in dental practice, in special when caused by opportunistic pathogens like P. aeruginosa, are highlighted.Uma ampla variedade de patógenos oportunistas tem sido detectadas nos tubos de alimentação de água dos equipos odontológicos, particularmente no biofilme formado na superfície do tubo. Entre os patógenos oportunistas encontrados nos tubos de água, Pseudomonas aeruginosa é reconhecida como uma das principais causadoras de infecções nosocomiais. Foram coletadas 160 amostras de água e 200 amostras de fomites em quarenta clinicas odontológicas na cidade de Barretos, São Paulo, Brasil, durante o período de Janeiro a Julho de 2005. Setenta e seis cepas de P. aeruginosa, isoladas a partir dos fomites (5 cepas e das amostras de água (71 cepas, foram analisadas quanto à susceptibilidade à seis drogas antimicrobianas freqüentemente utilizadas para o tratamento de infecções provocadas por P. aeruginosa. As principais suscetibilidades observadas foram para a

  13. ESTUDIO DE VIABILIDAD DE UNA CLINICA PRIVADA EN GUINEA ECUATORIAL

    OpenAIRE

    TEN ROLDÁN, CARLOTA

    2012-01-01

    El presente documento contiene un estudio de viabilidad sobre un proyecto consistente en la construcción de una clínica privada en Guinea Ecuatorial, concretamente en la ciudad de Bata, la más poblada del país. Esta idea surge de un propósito real de llevar a cabo dicho proyecto por parte de un inversor nativo de Guinea Ecuatorial.La metodología empleada para llevar a cabo dicha tarea ha sido elaboración de un estudio del entorno, analizando las características demográficas y económicas del p...

  14. Ruolo ed organizzazione della microbiologia clinica di domani

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    Giorgio Mucignat

    2006-12-01

    Full Text Available Infectious diseases continue to represent an important preventive and clinical problem especially in the light of the emergence of new pathogens, of the return of infrequent pathogens and of the increased risk of infective pathologies associated with migratory flow. Another critical point is represented by the possible insurgence of infections due to agents used in bioterrorism. More than ever it is indispensable for our country to define a network of structures able to give an organized response to these relevant problems both in terms of prevention and assistance. It is therefore important to define a protocol for clinical microbiology on a national basis that responds to different levels of activity. Keeping in mind that the fundamental objectives of microbiology are: - diagnosis of infective diseases - determination of resistance to antimicrobic drugs as a valid instrument to allow the clinician to proceed with specific treatment - control of infection spreading in the sanitary structures (hospital infections - to develop front line defence in new infections and bioterrorism, in collaboration with the department of prevention - to be a reference centre for specific training The principals on which one must base the reorganization are essentially three: 1. to configurate the microbiology service on the basis of real needs of the local population 2. to give qualitatively optimal results in real time 3. supporting “good clinical practice” to assure adequate patient results and acceptable costs for the regionale sanitary system (SSR The organization of microbiology should therefore foresee a microbiology department, structured on a provincial basis or a vast area including a structured centralized complex with peripheral structures (even simplified. This must integrate actively with the department of prevention in regard to the dynamics of infectious diseases in the territory and with the Division of Infectious Diseases (where this exists. In parallel an active interaction with research structures (IRCCS and University present in the territory to enable the coordinated implementation of the guidelines of research and its relapse on diagnostic exams. Keeping in mind that the quality of diagnostic performance is closely linked to the professional experience of the operators it is good practice centralizing some diagnostic procedures by identifying a reference centre. In a regional network organized in this way it is important to include a coordinating structure, since it is necessary to activate a complete level of communication, information exchange, activity planning, and complete problem solving.

  15. ENFERMEDAD DE VOGT KOYANAGI HARADA EN UNA SERIE CLINICA DE PACIENTES. EN RED DE SALUD UC: CLASIFICACION Y EVOLUCION CLINICA.

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    Enzo Castiglione A.

    2007-12-01

    Full Text Available La enfermedad de Vogt - Koyanagi - Harada (VKH es una panuveítisgranulomatosa bilateral con compromiso extraocular enel sistema auditivo, meníngeo y piel (1. Clínicamente se puedepresentar por ojo rojo profundo, bilateral, dolor ocular o compromisode la agudeza visual. Los hallazgos del examen clínicodependerán del estadío clínico de la enfermedad. Hay manifestacionestempranas como coroiditis (con o sin uveítis anterior o hiperemiadel disco óptico o desprendimientos retinales serosos,como también manifestaciones de enfermedad tardías: despigmentaciónocular, cicatrices coriorretinales o uveítis recurrente.Los tratamientos propuestos son múltiples: desde la observaciónhasta la corticoterapia por distintas vías de administración,inmunomoduladores, antimetabolitos o agentes alquilantes,dado que es desconocido el tratamiento más efectivo con lasmenores complicaciones a largo plazo. El diagnóstico diferencialincluye formas graves de retinopatía central serosa, traumaocular penetrante (quirúrgico o accidental y diversas causas deuveítis posterior y pan uveítis. Con el fin de definir poblacioneshomogéneas de pacientes con VKH para comenzar a desarrollarestudios clínicos y establecer de mejor manera su diagnóstico,tratamiento y pronóstico, en el año 2001 fueron replanteadoslos criterios diagnósticos de VKH por un comité internacional,determinando categorías de la enfermedad (2. Así, la enfermedadde VKH puede clasificarse como completa (enfermedad ocularmás compromiso de tegumentos y neurológicos, incompleta(enfermedad ocular más compromiso de tegumentos o compromisoneurológico y probable (enfermedad ocular pura.Nuestro objetivo fue clasificar a los pacientes con VKH evaluadosen la Red de Salud UC según los criterios del Comité Internacionalpara el estudio de la Enfermedad de VKH y evaluar susrespuestas a tratamiento y desarrollo de complicaciones.

  16. Legionnaires' disease in the renal transplant unit of "Hospital das Clinicas, FMUSP": during a five year period (1988-1993 Doença dos legionários na Unidade de Transplante Renal (UTR do Hospital das Clínicas FMUSP, no período de 1988 a 1993

    Directory of Open Access Journals (Sweden)

    Neusa Augusta de Oliveira Mazieri

    1994-06-01

    Full Text Available Several reports have related Legionella pneumophila with pneumonia in renal transplant patients, however this association has not been systematically documented in Brazil. Therefore this paper reports the incidence, by serologycal assays, of Legionella pneumophila serogroup 1 in these patients during a five year period. For this purpose sera from blood samples of 70 hospitalized patients with pneumonia from the Renal Transplant Unit of Hospital das Clinicas, FMUSP collected at the acute and convalescent phase of infection were submitted to indirect immunofluorescence assay (IFA to demonstrate anti-Legionella pneumophila serogroup 1 antibodies. Of these 70 patients studied during the period of 1988 to 1993,18 (25.71 % had significant rises in specific antibody titers for Legionella pneumophila serogroup 1. Incidence was interrupted following Hospital water decontamination procedures, with recurrence of infections after treatment interruption. In this study, the high susceptibility (25.71% of immunodepressed renal transplant patients to Legionella pneumophila serogroup 1 nosocomial infections is documented. The importance of the implementation and maintenance of water decontamination measures for prophylaxis of the infection is also clearly evident.Embora vários trabalhos tem mostrado a presença de Legionella pneumophila associado a pneumopatias infecciosas em transplantados renais, tal associação não fora antes realizado de maneira sistemática no Brasil. Os autores julgaram oportuno a determinação da incidência por comprovação sorológica da Legionella pneumophila sorogrupo 1 em transplantados renais num período de 5 anos. Para tanto amostras de soros de 70 pacientes com pneumopatia infecciosa internados na UTR do HC-FMUSP, colhidos na fase aguda e convalescente da infecção, foram submetidas à reação de imunofluo-rescência indireta para pesquisa de anticorpos anti-Legionella pneumophila sorogrupo 1. Dos 70 pacientes

  17. Quality control of orthocromatic radiographic films: comparative study. Control de calidad de peliculas radiograficas ortocromaticas: estudio comparativo

    Energy Technology Data Exchange (ETDEWEB)

    Carrasco, F.; Flores, A.; Ruiz Cruces, R.; Sendra, F.; Diez de los Rios, A.

    1994-01-01

    Orthocromatic films allows to reduce the dose per radiographic examination due to the use of rare earth green light emitting screens. In this work, seven X-ray orthocromatic films have been studied by means of light sensitometry, x-ray sensitometry and spatial resolution test. Three different screens were used. The films SHX55-G and Trimax XDA showed a base plus fog (0,29) higher than the others (0,22-0,26). When green light sensitometry was substituted by blue light sensitometry, base plus fog did not show variations, but speed decreased in all cases 10-17%. Films speed showed a strong dependence with the combined screen and the selected kilo voltage. The faster combinations at 80, 70 and 60 kVp were Lanex Regular/Trimax XDA, FG-8/SHX55-G and SHX-GD800/SHX55-G respectively. The slower film was Ortho-TG. All films showed and average gradient (G) at 70 kVp between, 1,77 and 2,00, except the film Super HR-G (G<1,69) and Trimax XLA (G<1,51). The film Trimax XDA obtained the best values of spatial resolution. Some data, in terms ob absolute speed are given, to compare the films of this study with other from a previous study about conventional blue sensitive films. (Author)

  18. Methodology to evaluation of the density in radiographic image; Metodologia para avaliacao de densidade em imagem radiografica

    Energy Technology Data Exchange (ETDEWEB)

    Louzada, M.J.Q. [UNESP, Aracatuba, SP (Brazil). Curso de Medicina Veterinaria; Pela, C.A. [Sao Paulo Univ., Ribeirao Preto, SP (Brazil). Faculdade de Filosofia, Ciencias e Letras; Belangero, W.D. [Universidade Estadual de Campinas, SP (Brazil). Faculdade de Ciencias Medicas; Santos-Pinto, R. [UNESP, Aracatuba, SP (Brazil). Faculdade de Odontologia

    1998-12-01

    This study was designed in order to optimize the optical densitometry technique in radiographic images by the setorization of the characteristic curves of the radiographic films. We used 24 radiographs of a stepped aluminium wedge that were taken without rigorous control development and manually revealed. The densitometric values of the steps images and its thickness, for each radiographic, was utilized to generate its particular mathematics expressions that represent its characteristic densitometric curves and then it were used for setorization. The densitometric values were obtained by a Macbeth TD528 densitometer. The study showed an optimization in the representation of the relationship between the optical density of the steps images of the wedge and its correspondent thickness, provided by the setorization, with mean square error around 10{sup -5}. This optimization will allow the use of this methodology in quantitative evaluations of bone mass, by radiographic images. (author)

  19. Optimization of radiation protection in gamma radiography facilities; Otimizacao do sistema de radioprotecao nas instalacoes radiograficas de gamagrafia

    Energy Technology Data Exchange (ETDEWEB)

    Antonio Filho, Joao

    1999-07-01

    To determine optimized dose limits for workers, a study of optimization of radiation protection was undertaken in gamma radiography facilities closed, using the Technique Multiple Attributes Utility Analysis. A total of 217 protection options, distributed in 34 irradiation scenarios for tree facility types ( fixed open, moveable and closed (bunker) were analyzed. In the determination of the optimized limit dose, the following attributes were considered; costs of the protection barriers, costs attributed to the biological detriment for different alpha (the reference value of unit collective dose), size of the isolation area, constrained limits dose of annual individual equivalent doses and collective dose. The variables studied in the evaluation included: effective work load, type and activity of the sources of radiation ({sup 192}Ir and {sup 60}Co), source-operator distance related to the characteristic of the length of the command cable and the guide tube, type and thickness of the materials used in the protection barriers (concrete, barite, ceramic, lead, steel alloy and tungsten). The optimal analytic solutions obtained in the optimization process that resulted in the indication of the optimized dose limit were determined by means of a sensitivity analysis and by direct and logic evaluations, thus, independent of the values of the monetary coefficient attributed to the biological detriment, of the annual interest rate applied to the protection cost and of the type of installation studied, it was concluded that the primary limit of annual equivalent dose for workers (now 50 mSv) can be easily reduced to an optimized annual dose limit of 5 mSv. (author)

  20. Study on radiographic and minerals characteristics of renal calculus; Estudo das caracteristicas radiograficas e minerais de calculos renais

    Energy Technology Data Exchange (ETDEWEB)

    Fernandes, Marco A.R., E-mail: mfernandes@fmb.unesp.b [Universidade Estadual Paulista Julio de Mesquita Filho (FMB/UNESP), Botucatu, SP (Brazil). Fac. de Medicina. Dept. de Dermatologia e Radioterapia; Goldberg, Jose [Universidade Estadual Paulista Julio de Mesquita Filho (FMB/UNESP), Botucatu, SP (Brazil). Fac. de Medicina. Dept. de Urologia; Sakate, Makoto [Universidade Estadual Paulista Julio de Mesquita Filho (FMB/UNESP), Botucatu, SP (Brazil). Fac. de Medicina. Dept. de Doencas Tropicais e Diagnostico por Imagem; Louzada, Mario J.Q. [Universidade Estadual Paulista Julio de Mesquita Filho (UNESP), Aracatuba, SP (Brazil). Curso de Medicina Veterinaria; Fernandes, Marco F.S. [Santa Casa de Misericordia de Sao Jose do Rio Preto, SP (Brazil). Dept. de Cirurgia Geral

    2010-07-01

    Radiological Images of kidneys stones were analyzed, quantifying the optical density (D.O.) and the blackening degree in the radiographic film of the samples. Studies of the literature, analyses of samples and interviews with specialists of the Center of Sciences and Technologies of Materials (CCTM) of the Institute of Energy and Nuclear Researches (IPEN/CNEN-SP), after crystallographic analysis for absorption techniques and diffraction of ray-X, showed that D.O. of the stones it is more directly dependent of their dimensions of what of their contents concentration. It is the researchers' consensus that as larger D.O. of the radiographic image of the calculation renal, larger her density (g/cm{sup 3}) and therefore larger the importance of the application of an appropriate energy for the fragmentation of the calculation. This energy, supplied by the equipment extracorporeal shock wave lithotripsy (ESWL) it depends on several parameters inside the ones which the anatomy and the patient's position and of the own limitations of the lithotripsy equipment. This interpretation, at least for the analyzed samples, it disappoints a simplistic correlation among the parameters of the shock waves used in the lithotripsy procedures and the measures of D.O. and characteristics minerals. Another restriction factor is the discrepancy of the radiological image the kidneys stones camped in the patient, surrounded by the organs and interposed bone structures, and gotten her through the analysis of the fragments expelled after the accomplishment of ESWL, which present great variety of granulations. (author)

  1. Osteosarcoma and chondrosarcoma: radiographic differentiation by means of computed tomography; Osteossarcoma e condrossarcoma - diferenciacao radiografica por meio da tomografia computadorizada

    Energy Technology Data Exchange (ETDEWEB)

    Tossato, Patricia dos Santos; Pereira, Amanda Caceres; Cavalcanti, Marcelo Gusmao Paraiso [Sao Paulo Univ., SP (Brazil). Faculdade de Odontologia. Dept. de Estomatologia

    2002-03-01

    The purpose of this paper was to associate and compare the radiographic patterns of osteosarcoma and those of chondrosarcoma by means of computed tomography (CT). Computed tomographs of five cases of osteosarcoma and five cases of chondrosarcoma of the head and neck region were analyzed. The sensitivity of CT was calculated based on the results of histopathological examinations. We concluded that CT can facilitate the establishment of the final diagnosis since it is possible to distinguish the individual characteristics of osteosarcomas and chondrosarcomas in that exam. (author)

  2. Chemical characterization of marajoara ceramics; Caracterizacao quimica da ceramica marajoara

    Energy Technology Data Exchange (ETDEWEB)

    Toyota, Rosimeiri Galbiati

    2009-07-01

    In this study the elemental concentration of Ce, Co, Cr, Cs, Eu, Fe, Hf, K, La, Lu, Na, Nd, Rb, Sc, Sm, Ta, Tb, Th, U, Yb and Zn were determined by instrumental neutron activation analysis (INAA) in 204 fragments of Marajoara archaeological ceramics, of which 156 were provided by the Archaeology and Ethnology Museum of Sao Paulo University (MAE) and 48 were provided by Dr. Denise Pahl Schaan, Marajo Museum curator. Also, 9 contemporary ceramics produced and marketed at Marajo Island were analyzed. Electron paramagnetic resonance (EPR) analyses were performed in 8 archaeological samples and 1 contemporary sample in order to identify the burning temperature of the samples. X-ray diffraction (XRD) analyses were performed in 13 archaeological samples and 2 contemporary samples for the investigation of their mineralogical composition. Mahalanobis distance was used for the study of outlier while modified filter was used for the study of the temper added to the ceramic paste. Result interpretation was performed using cluster analysis, principal components analysis and discriminant analysis. Procrustes analysis was used for variable selection and it showed that the Ce, Fe, Eu, Hf, K and Th variables are adequate for the characterization of the analyzed samples. The comparative study among the archaeological and contemporary ceramics showed the arrangement of two well-defined and close groups for the archaeological samples and a third, distant group for the contemporary ones. This result indicates that the archaeological and contemporary ceramics differ in their composition. EPR and XRD analysis were inconclusive for the differentiation of archaeological and contemporary ceramics. (author)

  3. Energetic characterization of Amazonian biomass; Caracterizacao energetica de biomassas amazonicas

    Energy Technology Data Exchange (ETDEWEB)

    Feitosa Netto, Genesio Batista; Oliveira, Antonio Geraldo de Paula; Coutinho, Hebert Willian Martins; Nogueira, Manoel Fernandes Martins; Rendeiro, Goncalo [Universidade Federal do Para (UFPA), Belem, PA (Brazil). Dept. de Engenharia Mecanica

    2006-07-01

    In order to asses the potentiality of Amazon biomasses to generate power, either to supply electric energy to the grid or as fuel to plants supplying power for off-grid location, data for their proximate analysis must be available. A literature review on the subject indicated a lack of information and data concerning typical Amazon rain forest species. This work aimed to characterize (proximate analysis) 43 Amazon species in order to evaluate the energy resource from woody biomass wastes in Amazon region. Higher heating value, carbon, volatile and ash contents were measured in a dry basis. The measurements were performed obeying the following Brazilian standards, NBR 6923, NBR 8112, NBR 8633, NBR 6922. (author)

  4. Obtention and characterization of biodiesel; Obtencao e caracterizacao do biodiesel

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Leonidas B.O. dos; Caitano, Moises; Aranda, Donato A.G.; Mothe, Cheila G. [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil)

    2004-07-01

    Biodiesel is an ester resulting from the transesterification reaction of an alcohol and an oil obtained from biomass. The products of the transesterification are an ester and the glycerol. The biodiesel and the petroleum commercial diesel have similar properties, and they can be mixed and used in diesel motors. The use of biodiesel will allow a better exploration of the energetic potential of our cultures. The biodiesel has some advantages compared to others combustibles, such as adaptability to usual diesel motors and non-generation of NO{sub x} and SO{sub x} compounds. Many experiments with biodiesel have been made in Brazil since the 70's. This work made samples of biodiesel by transesterification batch reactions to many blends of soybean oil and residual fry oil, at room temperature, using mechanical mixture or magnetic agitation by a magnetic stirrer, using as catalysts sodium methoxide and potassium hydroxide. For each obtained sample tests to determine the Acidity Index (ABNT-MB-74), Saponification Index (ABNT-MB-75), Iodine Wijz Index (ABNT-MB- 77), thermal analysis by DTA and TG (TA Instruments SDT 2960, 30 to 800 deg C, 10 deg C/min at nitrogen atmosphere) and rheological test (Haake RS 150 Rheo Stress rheometer) were done. (author)

  5. Lesões desportivas no atletismo: comparação entre informações obtidas em prontuários e inquéritos de morbidade referida Lesiones deportivas en el atletismo: comparacion entre las informaciones obtenidas en historias clinicas y consultas de la morbilidad referida Sports injuries in track and field: comparison between information obtained in medical records and reported morbidity inquires

    Directory of Open Access Journals (Sweden)

    Carlos Marcelo Pastre

    2004-02-01

    ões desportivas para a população investigada.Para comprender las lesiones deportivas (LD es necesario cuantificarlas, asociandolas a factores causales particulares al esporte. Aún así, faltan registros sobre estas patologías en las instituciones deportivas, sobretodo en el atletismo brasileño, donde pocos son los clubes que poseen servicios de asistencia de la salud. La ausencia de tales registros, estudios en el área de Salud Pública, se utilizan otros recursos epidemiológicos para colectas, tales como las consultas de morbilidad referida. A partir de esta escasez de información y de la facilidad de obtención de datos junto a los propios atletas, se objetivó, para esta pesquisa, levantar informaciones sobre las LD referidas por los atletas de alto rendimento, retrocediendo ocho meses, y comparándolas con los registros de historias clínicas. Por lo tanto, fueron tomados veinticinco atletas de elite, dieciseis de género masculino y nueve del femenino, con edades de 25,7 ± 4,4 años, altura de 1,74 ± 0,10 m, peso 70,4 ± 13,15 kg e tiempo médio de entrenamiento de 8,38 ± 4,06 años. Dos fisioterapeutas fueron entrenados separadamente para recolectar información sobre LD. Uno de ellos en historias clinicas y el otro de los propios atletas a través de entrevistas (Interrogatorio de Morbidade Referida - IMR. El estudio de concordancia de respuestas para las dos formas de colecta fué realizado por el test de proporción binomial, estabeleciendose límites de 95% de confianza para la concordancia. Los resultados mostraron que en todas las variables estudiadas los valores estaban dentro de los límites de confianza estabelecidos para los tests estadísticos, siendo: 88,33% para las variables tipo de lesión o agravio y mecanismo de lesión o aumento de los síntomas, 90% para la variable calidad del reintegro a las actividades deportivas el 91,67% para las variables local anatómico y período de entrenamiento. Se concluye por lo tanto, que ha habido una elevada

  6. Digital systems to acquire radiological imaging. Characteristics and quality control; Sistemas digitales de adquisicion de imagenes radiograficas. Caracteristicas y Control de Calidad

    Energy Technology Data Exchange (ETDEWEB)

    Torres Cabrera, R.; Hernando Gonzalez, I.

    2006-07-01

    Due to its special characteristics, quality control in digital radiographic systems is very important, even more than in conventional film-screen systems. Differences between digital and analogical images,a in terms of dynamics range, spatial and contrast resolution, and the flexibility of data post-processing require some actions to maintain clinical images in an optimum quality level. Revision 1 of the Spanish Protocol of Quality Control in Diagnostic Radiology includes a chapter dedicated to the quality control of these digital systems for the acquisition of radiographic images. In this paper the different parameters for quality control procedures are described. Also some difficulties to be concerned about (absence of levels of tolerance, access to the raw-data images and related information, availability of use anthropomorphic phantoms, etc, etc) are noted, as well as the most significant aspects of the differences in relation to the ana logical systems. (Author) 15 refs.

  7. Study of an optimization protocol for radiographic techniques in computerized radiology; Estudo de um protocolo de otimizacao para as tecnicas radiograficas em radiologia computadorizada

    Energy Technology Data Exchange (ETDEWEB)

    Abrantes, Marcos Eugenio Silva

    2015-07-01

    This work is designed to produce information for the improvement of image quality to deployment in a radiology department based on previous reviews of the images by questionnaires of acceptance and quality e recognition of the parameters used in chest radiographic techniques. The data collected were divided by male, female, PA and LAT thickness, body mass index, biotypes, anthropomorphic parameters and body evaluation associated with constant voltage and the additional filtration. The results show the predominance of 35 and 40 constants with additional filtration from 0.5 to 1.5 mmAl, voltage in male: (PA and LAT) 86-92 kV and 96-112 kV, female: 85-98 kV and 96-112 kV. The charge applied to the tube for males: (PA and LAT) 5-10 mA.s and 5-16 mA.s, female: (PA and LAT) 6.3-8 mA.s and 9-14 mA.s. Absorbed doses for males: (PA and PF) 0.04-0.17 mGy and 0.03-0.19 mGy and from female (PA and PF) from 0.03-0.22 mGy and 0, 04-0.17 mGy. This procedure can be used in radiology department to implement and acceptance in the quality of images. (author)

  8. Evaluation of X ray attenuation by means of radiographic images; Avaliacao da atenuacao da radiacao X por meio de imagens radiograficas

    Energy Technology Data Exchange (ETDEWEB)

    Barros, Frieda Saicla, E-mail: saicla@utfpr.edu.b [Universidade Tecnologica Federal do Parana (UTFPR), Curitiba, PR (Brazil); Paredes, Ramon S.C., E-mail: ramon@ufpr.b [Universidade Federal do Parana (UFPR), Curitiba, PR (Brazil); Godoi, Walmor C., E-mail: walmor.godoi@gmail.co [Faculdade de Tecnologia Camoes (FATEC), Curitiba, PR (Brazil); Souza, Gabriel Pinto de [Universidade Estadual Paulista (UNESP), SP (Brazil)

    2011-07-01

    This paper's main goal is to adopt a qualitative methodology to evaluate the attenuation of x-radiation through X-ray images in polymeric materials plus residual lead. To determinate the images it was initially used an experimental setup at the Laboratory for Materials Diagnostics LACTEC. These results correspond to a more qualitative analysis, even with quantitative answers. Through analysis of radiographic images we can measure the intensity of radiation that goes through the plate, making possible to establish a relationship between the attenuation coefficient and the thickness of the material. (author)

  9. Development of a computer code for shielding calculation in X-ray facilities; Desenvolvimento de um codigo computacional para calculos de blindagem em salas radiograficas

    Energy Technology Data Exchange (ETDEWEB)

    Borges, Diogo da S.; Lava, Deise D.; Affonso, Renato R.W.; Moreira, Maria de L.; Guimaraes, Antonio C.F., E-mail: diogosb@outlook.com, E-mail: deise_dy@hotmail.com, E-mail: raoniwa@yahoo.com.br, E-mail: malu@ien.gov.br, E-mail: tony@ien.gov.br [Instituto de Engenharia Nuclear (IEN/CNEN-RJ), Rio de Janeiro, RJ (Brazil)

    2014-07-01

    The construction of an effective barrier against the interaction of ionizing radiation present in X-ray rooms requires consideration of many variables. The methodology used for specifying the thickness of primary and secondary shielding of an traditional X-ray room considers the following factors: factor of use, occupational factor, distance between the source and the wall, workload, Kerma in the air and distance between the patient and the receptor. With these data it was possible the development of a computer program in order to identify and use variables in functions obtained through graphics regressions offered by NCRP Report-147 (Structural Shielding Design for Medical X-Ray Imaging Facilities) for the calculation of shielding of the room walls as well as the wall of the darkroom and adjacent areas. With the built methodology, a program validation is done through comparing results with a base case provided by that report. The thickness of the obtained values comprise various materials such as steel, wood and concrete. After validation is made an application in a real case of radiographic room. His visual construction is done with the help of software used in modeling of indoor and outdoor. The construction of barriers for calculating program resulted in a user-friendly tool for planning radiographic rooms to comply with the limits established by CNEN-NN-3:01 published in September / 2011.

  10. Radiographic evaluation of adenoidal size in children: methods of measurement and parameters of normality; Avaliacao radiografica da adenoide em criancas: metodos de mensuracao e parametros da normalidade

    Energy Technology Data Exchange (ETDEWEB)

    Araujo Neto, Severino Aires de [Centro de Assistencia Integral a Saude da Mulher (CAISM), Campinas, SP (Brazil)]. E-mail: severinoaires@hotmail.com; Queiroz, Suelio Marinho de [Tomovale, Sao Jose dos Campos, SP (Brazil); Baracat, Emilio Carlos Elias [Universidade Estadual de Campinas, SP (Brazil). Faculdade de Ciencias Medicas. Dept. de Pediatria; Pereira, Ines Minniti Rodrigues [Universidade Estadual de Campinas, SP (Brazil). Faculdade de Ciencias Medicas. Dept. de Radiologia

    2004-12-01

    Radiograph of the nasopharynx is still the most commonly used imaging method to investigate the adenoidal tissue. Due to the variety and complexity of proposed methods to measure the adenoid size, some radiologists prefer subjective evaluation, which can, however, be imprecise and inaccurate. We review and describe several methods to determine the adenoid size, taking into account the practicity, accuracy and precision with the aim of pointing out the best methods to be applied in daily routine practice. (author)

  11. A clinica como pratica arborifica e rizomorfica do trabalho em enfermagem cirurgica

    Directory of Open Access Journals (Sweden)

    Lenice Dutra de Sousa

    2013-12-01

    Full Text Available Foi realizada uma pesquisa qualitativa e exploratória, na forma de um estudo de caso, em uma unidade de internação cirúrgica de um hospital universitário, que objetivou analisar o trabalho do enfermeiro sob a ótica da produção de cuidados em saúde e do exercício da clínica. Os sujeitos do estudo foram seis enfermeiros e foram realizadas observações não participantes, pesquisa documental e entrevistas em profundidade com posterior análise textual discursiva. Verificou-se que o trabalho da enfermagem é organizado segundo duas perspectivas interconectadas e interdependentes: a do modelo clínico, que compõe a estrutura-mestre de sua prática, e uma estrutura composta por elementos múltiplos e heterogêneos. O modelo clínico de assistência organiza-se como uma estrutura centrada que possibilita a resolutividade das necessidades biológicas e atua como base para a conexão de outros saberes e práticas que expandem o fazer do enfermeiro por meio de interligações com o ambiente.

  12. SOIL-TRANSMITTED HELMINTHS IN CHILDREN WITH CLINICA L SYMPTOMS OF INFECTION

    Directory of Open Access Journals (Sweden)

    Rudramuneswara Swamy

    2013-04-01

    Full Text Available ABSTRACT: The study was conducted to know the prevalence of s oil-transmitted helminths (STH in children aged 1-14 years attending outpati ents and inpatients from both urban and rural background. Out of the 550 stool samples exami ned, 450 were from the study group and 100 from the control group. All the 450 children of the study group presented one or more of the classical symptoms like abdominal pain, low grade fever, diarrhoea, dysentery, constipation and pica. Hundred children from the control group did not have any classical symptoms. Thirty five per cent from the study group and 21 per cent fro m the control group were found positive for one or more of the helminthic infection. The prevalence of Ascaris lumbricoides, Trichuris tr ichiura, Ancylostoma duodenale & Necator americanus (hookworm, Hymenolepis nana and Enterobius vermicularis were 27%, 15%, 0.4%, 2% and 0.22%, respectively in the study g roup and 15%, 10%, 4%, 2%, and 2%, respectively in the control group. Strongyloides ster coralis was not found either in the study or control groups. Helminthic infections were more comm on in 7-9 years of age group, urban children with low socio-economic strata, and with m ale preponderance. Majority of children who harboured STH were suffering from abdominal pain and low grade fever. Total 450 clinical samples (control group examined b y direct wet mount, saturated salt floatation, and formalin-ether sedimentation; and o nly 391 samples examined by Kato-Katz semiquantitative techniques. Twenty six per cent posi tive by direct wet mount, 35% by both saturated salt floatation and formalin-ether sedime ntation whereas 38% of the samples were found positive by Kato-Katz semiquantitative techniq ue. In conclusion, concentration techniques like saturated salt floatation and forma lin-ether sedimentation are the best diagnostic tools to get authentic and reliable resu lts and to rule out fallacious inference caused by relying only on direct wet mount preparation, whe reas Kato-Katz, a semiquantitative technique is the best diagnostic method to know the prevalence and intensity of the STH infection. This technique is simple, rapid, reliable, and mild infections can also be detected. No special equipment and expertise are needed and it can be performed in the field survey.

  13. Radio sterilized human ligaments and their clinical application;Ligamentos humanos radioesterilizados y su aplicacion clinica

    Energy Technology Data Exchange (ETDEWEB)

    Luna Z, D.; Reyes F, M. L. [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico); Diaz M, I.; Hernandez R, G., E-mail: daniel.luna@inin.gob.m [Centro Estatal de Trasplantes del Estado de Mexico, Pablo Sidar No. 602, Col. Universidad, 50130 Toluca, Estado de Mexico (Mexico)

    2009-10-15

    The ligaments are human tissues that are used in the transplantation area. A ligament is an anatomical structure in band form, composed by resistant fibers that connect the tissues that unite the bones with the articulations. In an articulation, the ligaments allow and facilitate the movement inside the natural anatomical directions, while it restricts those movements that are anatomically abnormal, impeding lesions that could arise of this type of movements. The kneecap ligament is a very important tissue in the knee mobility and of walking in the human beings. This ligament can injure it because of automobile accidents, for sport lesions or illnesses, and in many cases the only form of recovering the knee movement is carried out a transplant with the purpose of replacing the damage ligament by allo gen kneecap ligament processed in specialized Tissue Banks where the tissue is sterilized with gamma radiation of {sup 60}Co at very low temperatures, obtaining high quality ligaments for clinical application in injured patients. The kneecap ligaments are processed in the Tissue Banks with a segment of kneecap bone, a segment of tibial bone, the contained ligament between both bones and in some cases a fraction of the quadriceps tendon. In this work is given a description of the selection method of the tissue that includes the donor's serologic control, the kneecap ligament processing in the Radio Sterilized Tissues Bank, its sterilization with gamma radiation of {sup 60}Co, also it is indicated like the clinical application of the allo gen ligament was realized in a hasty patient and whose previous crossed ligament was injured. Finally the results are presented from the tissue obtaining until the clinical application of it is, and in this case is observed a favorable initial evolution of the transplantation patient. (Author)

  14. Corrimentos vaginais em gestantes: comparacao da abordagem sindromica com exames da pratica clinica da enfermagem

    Directory of Open Access Journals (Sweden)

    Thais Marques Lima

    2013-12-01

    Full Text Available Estudo avaliativo de abordagem quantitativa, com amostra de 104 gestantes, com o objetivo de comparar os achados de infecções vaginais em gestantes obtidos por meio do fluxograma de corrimento vaginal com exames presentes na prática clínica da Enfermagem. Os dados foram coletados por meio de entrevista e exame ginecológico realizados de janeiro a julho de 2011. O fluxograma não se mostrou eficaz na identificação de candidíase e tricomoníase, apresentou baixa sensibilidade (0,0%; 50% e valor preditivo positivo (0,0%; 3,6% para as duas infecções e baixa especificidade para tricomoníase (46%. Mostrou-se satisfatório para vaginose bacteriana, com alta sensibilidade (100%, valor preditivo negativo (100% e acurácia (74%. Conclui-se que o emprego do fluxograma precisa ser reavaliado, visto que não foi eficaz em identificar infecções importantes em gestantes. Os esforços para o desenvolvimento de testes eficazes devem ser contínuos, com intuito de prevenir a disseminação de infecções e reduzir tratamentos desnecessários.

  15. Applicazione della spettrometria di massa MALDI-TOF in microbiologia clinica

    OpenAIRE

    Piergianni, Maddalena

    2016-01-01

    Riassunto La spettrometria di massa (MS) nata negli anni ’70 trova oggi, grazie alla tecnologia Matrix-Assisted Laser Desorption Ionization-Time of Flight (MALDI-TOF), importanti applicazioni in diversi settori: biotecnologico (per la caratterizzazione ed il controllo di qualità di proteine ricombinanti ed altre macromolecole), medico–clinico (per la diagnosi di laboratorio di malattie e per lo sviluppo di nuovi trattamenti terapeutici mirati), alimentare ed ambientale. Negli ultimi ann...

  16. Epidemiology of septic arthritis of the knee at Hospital das Clinicas, Universidade de Sao Paulo

    Directory of Open Access Journals (Sweden)

    Camilo Partezani Helito

    2014-01-01

    Full Text Available Background: Septic arthritis is an infrequent disease although very important due to the possibility of disastrous outcomes if treatment is not adequately established. Adequate information concerning the epidemiology of septic arthritis is still lacking due to the uncommon nature of the disease as well as the struggle to establish a correct case-definition. Objective: To epidemiologically characterize the population seen at Hospital das Clínicas, University of São Paulo with a diagnosis of septic arthritis between 2006 and 2011. Methods: Sixty-one patients diagnosed with septic arthritis of the knee between 2006 and 2011 were retrospectively evaluated. The patients' clinical and epidemiological characteristics, the microorganisms that caused the infection and the patients' treatment and evolution were analyzed. Results: Septic arthritis of the knee was more common among men, with distribution across a variety of age ranges. Most diagnoses were made through positive synovial fluid cultures. The most prevalent clinical comorbidities were systemic arterial hypertension and diabetes mellitus, and the most commonly reported joint disease was osteoarthritis. Staphylococcus aureus was the prevailing pathogen. Fever was present in 36% of the cases. All patients presented elevation in inflammatory tests. Gram staining was positive in only 50.8% of the synovial fluid samples analyzed. Six patients presented complications and unfavorable evolution of their condition. Conclusion: S. aureus is still the most common pathogen in acute knee infections in our environment. Gram staining, absence of fever and normal leukocyte count cannot be used to rule out septic arthritis.

  17. Fracture liaison service in a non-regional orthopaedic clinic--a cost-effective service.

    LENUS (Irish Health Repository)

    Ahmed, M

    2012-01-01

    Fracture liaison services (FLS) aim to provide cost-effective targeting of secondary fracture prevention. It is proposed that a dedicated FLS be available in any hospital to which a patient presents with a fracture. An existing orthopaedic clinic nurse was retrained to deliver a FLS. Proformas were used so that different nurses could assume the fracture liaison nurse (FLN) role, as required. Screening consisted of fracture risk estimation, phlebotomy and DXA scanning. 124 (11%) of all patients attending the orthopaedic fracture clinic were reviewed in the FLS. Upper limb fractures accounted for the majority of fragility fractures screened n=69 (55.6%). Two-thirds of patients (n=69) had reduced bone mineral density (BMD). An evidence based approach to both non-pharmacological and pharmacotherapy was used and most patients (76.6%) receiving pharmacotherapy received an oral bisphosphonate (n=46). The FLS has proven to be an effective way of delivering secondary prevention for osteoporotic fracture in a non-regional fracture clinic, without increasing staff costs.

  18. CONSENTIMIENTO INFORMADO EN LA PRÁCTICA CLINICA: RETOS DEL PERSONAL DE SALUD

    Directory of Open Access Journals (Sweden)

    Francisco Javier Bonilla Escobar

    2012-01-01

    Full Text Available El consentimiento informado es una herramienta cotidiana en la práctica clínica; para comprenderlo se requiere de un proceso formativo y acadé- mico que genere las actitudes para proponer consentimientos informados éticamente aceptables y que estos abarquen la perspectiva del paciente. El consentimiento requiere de un uso adecuado y de su entendimiento por parte del paciente como del profesional de salud que lo administra, siendo de utilidad ética y legal, motivo por el cual no debe ser subestimado. Es importante que dicho conocimiento implique en forma clara el reconoci- miento tanto del médico como del paciente de la(s intervención(es, de las posibles consecuencias y situaciones a las que pudiera estar expuesto. Este artículo es una revisión al respecto del consentimiento informado, partiendo de su historia, evolución e implicaciones para el personal de la salud en general, con el objetivo de orientar e informar sobre su uso y evolución en la práctica clínica. El área bioética y los temas concernientes al consentimiento informado son necesidades de difusión e investigación en Latinoamérica para la protección del paciente y la buena práctica del personal de salud.

  19. CONSENTIMIENTO INFORMADO EN LA PRÁCTICA CLINICA: RETOS DEL PERSONAL DE SALUD

    Directory of Open Access Journals (Sweden)

    Francisco Javier Bonilla Escobar

    2013-08-01

    Full Text Available El consentimiento informado es una herramienta cotidiana en la práctica clínica; para comprenderlo se requiere de un proceso formativo y académico que genere las actitudes para proponer consentimientos informados éticamente aceptables y que estos abarquen la perspectiva del paciente. El consentimiento requiere de un uso adecuado y de su entendimiento por parte del paciente como del profesional de salud que lo administra, siendo de utilidad ética y legal, motivo por el cual no debe ser subestimado. Es importante que dicho conocimiento implique en forma clara el reconocimiento tanto del médico como del paciente de la(s intervención(es, de las posibles consecuencias y situaciones a las que pudiera estar expuesto. Este artículo es una revisión al respecto del consentimiento informado, partiendo de su historia, evolución e implicaciones para el personal de la salud en general, con el objetivo de orientar e informar sobre su uso y evolución en la práctica clínica. El área bioética y los temas concernientes al consentimiento informado son necesidades de difusión e investigación en Latinoamérica para la protección del paciente y la buena práctica del personal de salud.

  20. Two patients walk into a clinic...a genomics perspective on the future of schizophrenia

    Directory of Open Access Journals (Sweden)

    Corvin Aiden P

    2011-11-01

    Full Text Available Abstract Progress is being made in schizophrenia genomics, suggesting that this complex brain disorder involves rare, moderate to high-risk mutations and the cumulative impact of small genetic effects, coupled with environmental factors. The genetic heterogeneity underlying schizophrenia and the overlap with other neurodevelopmental disorders suggest that it will not continue to be viewed as a single disease. This has radical implications for clinical practice, as diagnosis and treatment will be guided by molecular etiology rather than clinical diagnostic criteria.

  1. [Food status peculiarities, anthropometric, clinica and biochemical indices at professional sportsmen].

    Science.gov (United States)

    Gapparova, K M; Nikitiuk, D B; Zaĭnudinov, Z M; Tserekh, A A; Chekhonina, Iu G; Golubeva, A A; Sil'vestrova, G A; Rusakova, D S; Grigor'ian, O N

    2011-01-01

    Under steady state conditions in 66 athletes involved in weightlifting, bodybuilding, judo and taekwondo have studied features of the metabolic status. Data on matter-of-fact nutrition, body weight content within the inter-competition period, energy exchange, clinical and biochemical indices and physical acceptability indices were analyzed. As a result, the decrease indexes of metabolism at all the sportsmen and high-level caloric value at sportsmen who are engaged in weightlifting, which corresponds their energy expenditures, was revealed.

  2. [Alarming signs and symptoms in the early diagnostics of late onset Pompe disease: super omnia clinica].

    Science.gov (United States)

    Nikitin, S S; Kurbatov, S A; Bredelev, V A; Kovalchuk, M O

    2015-01-01

    Pompe disease (PD) is a rare autosomal recessive muscle lysosomal glycogenosis caused by a deficiency of acid-α-glucosidase. There are two main forms of the disease: aggressive infantile PD started within the first year of life with a severe enzyme deficiency and multiorgan involvement, and late onset PD (LOPD) with progressive signs and symptoms including predominant proximal, axial muscle weakness and respiratory insufficiency started at any time from 1 till 75 years and older. Usually due to physician's unawareness, most adults with PD are diagnosed with great delay. The typical features and early nonspecific signs in four patients, aged between 35 and 72 years, with confirmed LOPD are delineated and discussed in correspondence with the age of first signs, age development of muscle weakness, distribution and age of final diagnosis. The disorders for differential diagnosis and spectrum of conditions that expanded the possibility of PB are listed. The fluorometrically analyzed level of acid α-glucosidase from dried blood spots is considered to be the first choice diagnostic method for clinically suspected cases of LOPD.

  3. The equivalent Histograms in clinical practice; Los histogramas equivalentes en la practica clinica

    Energy Technology Data Exchange (ETDEWEB)

    Pizarro Trigo, F.; Teijeira Garcia, M.; Zaballos Carrera, S.

    2013-07-01

    Is frequently abused of The tolerances established for organ at risk [1] in diagrams of standard fractionation (2Gy/session, 5 sessions per week) when applied to Dose-Volume histograms non-standard schema. The purpose of this work is to establish when this abuse may be more important and realize a transformation of fractionation non-standard of histograms dosis-volumen. Is exposed a case that can be useful to make clinical decisions. (Author)

  4. Coronary CT: clinical indications and future directions; Tomografia de coronarias: indicacoes clinicas e perspectivas futuras

    Energy Technology Data Exchange (ETDEWEB)

    Nomura, Cesar H.; Serpa, Bruna S.; Kay, Fernando U.; Szarf, Gilberto; Passos, Rodrigo B.; Neto, Roberto S.; Chate, Rodigo C.; Funar, Marcelo B., E-mail: cesarnomura@gmail.com [Hospital Israelita Albert Einstein, Sao Paulo, SP (Brazil); Cury, Roberto C. [Hospital Samaritano, Sao Paulo, SP (Brazil)

    2011-01-15

    Multidetector computed tomography (MDCT) has started its implementation in cardiology with calcium quantification of coronary plaques in the study without contrast, using the calcium score, demonstrating an important independent predictor of future cardiac events. The examination with intravenous contrast, coronary angiography, appeared later as a noninvasive method for evaluation of anatomy and obstructive coronary disease, characterizing the degree of stenosis and the presence of non calcified atherosclerotic plaques, assessing not only the lumen, but also the vessel wall. With the advent of new machines with more detectors and higher temporal resolution has been a reduction in radiation dose and the possibility of new applications. (author)

  5. Two patients walk into a clinic...a genomics perspective on the future of schizophrenia

    LENUS (Irish Health Repository)

    Corvin, Aiden P

    2011-11-11

    Abstract Progress is being made in schizophrenia genomics, suggesting that this complex brain disorder involves rare, moderate to high-risk mutations and the cumulative impact of small genetic effects, coupled with environmental factors. The genetic heterogeneity underlying schizophrenia and the overlap with other neurodevelopmental disorders suggest that it will not continue to be viewed as a single disease. This has radical implications for clinical practice, as diagnosis and treatment will be guided by molecular etiology rather than clinical diagnostic criteria.

  6. Hidroxiapatita Porosa Coralina Hap-200. 15 Años de Aplicaciones Clinicas

    Directory of Open Access Journals (Sweden)

    Ramón González Santos

    2005-01-01

    Full Text Available La Hidroxiapatita Porosa Coralina HAP-200 es un biomaterial de implante óseo desarrollado en Cuba hace más de 15 años y se ha aplicado con éxito como sustituto del injerto óseo y como implante ocular integrado. En el presente trabajo se brinda una información resumida de los principales resultados obtenidos en la etapa de desarrollo y aplicaciones clínicas del mismo. Este biomaterial en forma de bloques y esferas con diferentes dimensiones así como granulados con distintos tamaños de las partículas ha sido evaluado teniendo en cuenta todos los parámetros de su comportamiento "in vivo" tanto preclínico como clínico según exigen las normas de evaluación y registro de biomateriales del CCEEM del MINSAP de Cuba. Se han realizado varios protocolos de ensayos clínicos, tanto controlados como multicéntricos, de postproducción, de seguimiento y estudio del comportamiento clínico a largo plazo, de extensión e introducción en el sistema nacional de salud así como los estudios y diseño del sistema productivo y de gestión de la calidad que avalan la obtención de varios certificados de registro sanitario tanto en Cuba como en el extranjero así como los certificados de buenas prácticas de fabricación. Durante los 15 años de aplicaciones clínicas en Cuba se han tratado 9 613 pacientes en las especialidades de estomatología, incluyendo la cirugía maxilofacial, 783 personas han recibido implantes oculares y 2 592 han sido tratadas por defectos óseos de los huesos largos y otros en ortopedia y traumatología. Solo se ha reportado un 3,2 % de fracaso de los implantes por diferentes causas asociadas al tratamiento quirúrgico y en ningún caso por causa del biomaterial, demostrando este último una excelente biocompatibilidad con integración e incorporación a la dinámica natural del tejido óseo al cabo del tiempo. Los resultados obtenidos son excelentes tanto desde el punto de vista de las características y propiedades del biomaterial como de su comportamiento ¿in vivo¿ y el impacto en la salud y calidad de vida de nuestra población.

  7. Production and characterization of ceramics for armor application; Producao e caracterizacao de ceramicas para blindagem balistica

    Energy Technology Data Exchange (ETDEWEB)

    Alves, J.T.; Lopes, C.M.A. [Instituto Tecnologico de Aeronautica (ITA), Sao Jose dos Campos, SP (Brazil). Div. de Engenharia Mecanica-Aeronautica; Assis, J.M.K.; Melo, F.C.L., E-mail: cmoniz@iae.cta.b [Instituto de Aeronautica e Espaco (IAE), Sao Jose dos Campos, SP (Brazil). Div. de Materiais

    2010-07-01

    The fabrication of devices for ballistic protection as bullet proof vests and helmets and armored vehicles has been evolving over the past years along with the materials and models used for this specific application. The requirements for high efficient light-weight ballistic protection systems which not interfere in the user comfort and mobility has driven the research in this area. In this work we will present the results of characterization of two ceramics based on alumina and silicon carbide. The ceramics were produced in lab scale and the specific mass, scanning electron microscopy (SEM) microstructure, Vickers hardness, flexural resistance at room temperature and X-ray diffraction were evaluated. Ballistic tests performed in the selected materials showed that the ceramics present armor efficiency. (author)

  8. Production and characterization of composite stone; Processamento e caracterizacao de pedra composta

    Energy Technology Data Exchange (ETDEWEB)

    Leirose, G.D. [Universidade Federal de Ouro Preto (UFOP), MG (Brazil); Lameiras, F.S., E-mail: danileirose@yahoo.com.br [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte, MG (Brazil)

    2012-07-01

    Composite stone is a product similar to natural granite or marble, produced with particles of these materials. This material is used like natural stone as lining. The fabrication of artificial stones using residues of banded iron formations is a promising alternative to its actual destination (storage in dam). This research aims the characterization of composite stone to prove the efficacy of this kind of processing. It was used first, natural quartz as a raw material. The patterns of the samples were confirmed by IR spectra and XRD patterns, ensuring the reproducibility of processing applied. Moreover, this material is homogeneous, with low porosity and high flexural strength, confirmed by its structural characterization. Thus, it can be affirmed that the process chosen is suitable, enabling the application of this methodology to the use of waste. (author)

  9. Socio environmental characterization of the planned electric power system; Caracterizacao socioembiental do sistema eletrico planejado

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2006-07-01

    The following aspects are covered by this chapter: reference alternative of the generation system; socio environmental analysis of the enterprise generations; reference configuration of the transmission system.

  10. Characterization of grog of bricks; Caracterizacao de chamote de blocos de vedacao

    Energy Technology Data Exchange (ETDEWEB)

    Candido, V.S.; Pinheiro, R.M.; Monteiro, S.N.; Vieira, C.M.F. [Universidade Estadual do Norte Fluminense Darcy Ribeiro (LAMAV/CCT/UENF), Campos dos Goytacazes, RJ (Brazil). Lab. de Materiais Avancados

    2010-07-01

    This work aims to characterize a waste of red ceramic, grog, generated from the milling of defective pieces of bricks fired in a Hoffmann type furnace by a industry from Campos dos Goytacazes-RJ. The grog was tested for X-ray diffraction, X-ray fluorescence, thermogravimetric and differential thermal analysis, dilatometry, sieving and sedimentation by gravity and optical microscopy. The results indicated that the grog is predominantly constituted of quartz, muscovite mica and hematite. The presence of kaolinite indicates that the bricks were fired at low temperatures, below 600 deg C. Finally, the characterization results indicated that the grog presents itself as an alternative non plastic material to be used in mixtures with clays for the production of red ceramics. (author)

  11. Magnetic ionic liquids: synthesis and characterization; Liquidos ionicos magneticos: sintese e caracterizacao

    Energy Technology Data Exchange (ETDEWEB)

    Medeiros, Anderson M.M.S.; Parize, Alexandre L.; Oliveira, Vanda M.; Neto, Brenno A.D.; Rubim, Joel C. [Universidade de Brasilia (LMC/IQ/UnB), DF (Brazil). Inst. de Quimica. Lab de Materiais e Combustiveis

    2010-07-01

    The synthesis of magnetic ionic liquids (MILs) based on the stable dispersions of magnetic nanoparticles (MNPs) of {gamma}-Fe{sub 2}O{sub 3}, Fe{sub 3}O{sub 4}, and CoFe{sub 2}O{sub 4} in the ionic liquid 1-n-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (BMI.NTf{sub 2}) is reported. The MNPs were obtained by the coprecipitation method. The surface of the {alpha}-Fe{sub 2}O{sub 3}, Fe{sub 3}O{sub 4}, and CoFe{sub 2}O{sub 4} MNPs with mean sizes (XRD) of 9.3, 12.3, and 11.0 nm, respectively were functionalized by 1-n-butyl-3-(3'-trimethoxypropylsilane)- imidazolium chloride. The non functionalized and functionalized MNPs were further characterized by Raman, FTIR-ATR, and FTNIR spectroscopy and by TGA. The stability of the MILs was assigned to the formation of at least one monolayer of the surface modifier agent that mimics the structure of the BMI.NTf{sub 2} IL. (author)

  12. Gelatin/chitosan biofilm: preparation and characterization; Biofilme gelatina/quitosana: preparacao e caracterizacao

    Energy Technology Data Exchange (ETDEWEB)

    Trindade, Luciane da C.; Nunes, Raquel A.; Diniz, Nadie K.S. [Engenharia de Materiais, Universidade Federal de Campina Grande - UFCG, Campina Grande, PB (Brazil); Braga, Carla R.C. [Programa de Pos-graduacao em Ciencia e Engenharia de Materiais da UFCG, Campina Grande, PB (Brazil); Silva, Suedina M. de Lima, E-mail: suedina@dema.ufcg.edu.br [Unidade Academica de Engenharia de Materiais da UFCG, Campina Grande (Brazil)

    2011-07-01

    In this study, gelatin, chitosan and gelatin/chitosan bio films using the ratio of gelatin/chitosan (50/50) were prepared by casting method. The bio films prepared were characterized by X-ray diffraction, scanning electron microscopy and dissolution ratio. According to the results, the incorporation of chitosan into gelatin indicate the decrease of crystallinity of chitosan, a compact structure without large pores and that the dissolution of gelatin/chitosan film is little influenced by hot water than gelatin films. (author)

  13. Characterization of nanocomposites PHBV/attapulgite organophilic; Caracterizacao de nanocompositos PHBV/atapulgita organofilica

    Energy Technology Data Exchange (ETDEWEB)

    Silva, L.C.A.; Barreto, L.S., E-mail: lilianealcantara@msn.co [Universidade Federal de Sergipe (UFS), Sao Cristovao, SE (Brazil). Programa de Pos-graduacao em Ciencia e Engenharia de Materiais; Thire, R.M.S.M. [Coordenacao dos Programas de Pos-Graduacao de Engenharia (PEMM/COPPE/UFRJ), Rio de Janeiro, RJ (Brazil). Programa de Engenharia Metalurgica e de Materiais

    2010-07-01

    Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) - PHBV is a biodegradable polyester which have been studied as an option for the production of disposable goods. This thermoplastic has some disadvantages that limit its use in industrial scale applications: the relative difficulty of processing, high degree of crystallinity and high cost of production relative to conventional polymers. An alternative to improve the properties of PHBV is the incorporation of small amounts of clay to the polymer. The aim of this work was to produce and characterize PHBV nanocomposites reinforced with organophilic attapulgite in different compositions. Natural attapulgite was modified with hexadecylmethylammonium chloride. The nanocomposites were characterized by XRD, SEM and Thermal analysis. It was observed reduction of the degree of crystallinity, melting and glass transition temperatures and the thermal stability of polymer in function on the addition of clay to the matrix of the PHBV. The best results were obtained for PHBV films containing 3% and 5% attapulgite. These films presented a slight increasing in processing window and decreasing in crystalline temperature and in degree of crystallinity as compared to pure PHBV. (author)

  14. Materials characterization by photoelectron spectroscopy; Caracterizacao de materiais por espectroscopia de fotoeletrons

    Energy Technology Data Exchange (ETDEWEB)

    Nascente, P.A.P., E-mail: nascente@ufscar.b [Universidade Federal de Sao Carlos (DEMa/UFSCar), SP (Brazil). Dept. de Engenharia de Materiais

    2010-07-01

    Low energy electrons are suitable for investigating surfaces due to their low mean free path in solids, which correspond to a few atomic layers (0.5 to 3.0 nm), and could be used in one of the following ways: incident electrons cause the emission of backscattered and secondary electrons and the electrons are excited by irradiated photons. The first case includes the emission of Auger electrons, while photoemission corresponds to the second case. X-ray photoelectron spectroscopy (XPS) is one of the most used surface analysis techniques since it is able to identify not only the surface constituents but also their chemical states. XPS can be employed in several areas of science and engineering, but in this report it will be presented only few examples of its use in the characterization of metallic materials, with an emphasis on thin films of noble and transition metals. (author)

  15. Thermodegradation of biodiesel: thermoanalytical and rheological characterization; Degradacao termica de biodiesel: caracterizacao termoanalitica e reologica

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Everson L.; Carvalho, Laura H.; Araujo, Gilmar T.; Gadelha, Tatiana S. [Universidade Federal de Campina Grande (UFCG), PB (Brazil)

    2008-07-01

    Brazil is a country of extensive agricultural land and great oil consumption and these factors favor biodiesel production in this country. In order for diesel/biodiesel mixtures to be effectively employed in diesel engines, a rigid quality control of these mixtures is needed. Biodiesel and mixtures must have their quality monitored with respect to oxidative resistance, thermal stability, fluidity and volatility, properties which can be modified by the adverse transport and stock conditions prior to consumption. Oxidation is the main degradation mechanism of products under transport and stock conditions, which can lead to significant economical losses. In this work sought the thermal degradation of neat biodiesel, synthesized in our laboratories was monitored. Thermal aging was conducted at 210 deg C for up to 1000 h. Virgin and thermally degraded samples were characterized by rheological measurements (in different shear conditions); FTIR; density and by color changes. We concluded that the soy biodiesel was successfully synthesized and that thermal exposure caused thermal-oxidative degradation of the biodiesel sample, significantly changing its properties as a function of thermal exposure times. (author)

  16. Bio-inspired synthesis and characterization of superparamagnetic particles; Sintese e caracterizacao bioinspirada de particulas superparamagneticas

    Energy Technology Data Exchange (ETDEWEB)

    Castro, Vinicius F., E-mail: vfc_mg@yahoo.com.br [Universidade Federal de Itajuba (UNIFEI), MG (Brazil); Queiroz, Alvaro A.A. [Universidade Federal de Itajuba (UNIFEI), MG (Brazil). Centro de Estudos e Inovacao em Materiais Biofuncionais Avancados

    2012-08-15

    This paper discusses the bio-inspired synthesis of type YFeAl ferrites encapsulated into polyglycerol dendrimers (PGLD) generation 3. The structure and morphological properties of the system YFeAl/PGLD was characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The magnetic properties were studied through the techniques of Moessbauer spectroscopy and magnetization. The cytotoxicity of the nanoparticles encapsulated in dendrimers PGLD G3 at the cell membrane was studied against mammalian cell line CHO.K1 measuring the amount of lactate dehydrogenase (LDH) released by the cell damage. Microscopy TEM and XRD analysis indicate that spherical nanoparticles were obtained highly crystalline and monodisperse with size 20 nm

  17. Characterization of clay of Vitoria da Conquista - BA - Brazil; Caracterizacao de uma argila caulinitica por Rietveld

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, O.M.; Zandonadi, A.R.; Martins, M.V. Surmani; Carrio, J.A.G.; Munhoz Junior, A.H., E-mail: orley10@yahoo.com.br [Universidade Presbiteriana Mackenzie, Sao Paulo, SP (Brazil)

    2011-07-01

    Kaolinitic clays are vastly used in ceramic industry. Kaolinitic clay that are not coloured after firing are very useful in the production of ceramics because of their aesthetic aspect after firing. In this work clay material from Vitoria da Conquista (South- West Bahia, Brazil) was characterized by several techniques. The differential Scanning Calorimetry (DSC) shows a kaolinite characteristic curve with an endothermic peak at 492 deg C, which corresponds to the kaolinite - metakaolinite transformation. The transformation of alpha to beta quartz characterized by a 573 deg C peak was also observed in DSC. The samples were also characterized by water absorption and x rays powder diffraction. The 1100 deg C burned samples were tested by flexural strength. (author)

  18. Characterization of hydroxyapatite substituted with silicon; Caracterizacao de hiroxiapatita substituida com silicio

    Energy Technology Data Exchange (ETDEWEB)

    Silva, H.M. da; Soares, G.A., E-mail: helena@metalmat.ufrj.b [Universidade Federal do Rio de Janeiro (COPPE/UFRJ), RJ (Brazil). Coordenacao dos Programas de Pos-graduacao em Engenharia. Lab. de Biomateriais para Engenharia Ossea; Mateescu, M.; Anselme, K. [Universite de Haute-Alsace (UHA/IS2M), Mulhouse (France). Inst. de Science des Materiaux; Palard, M.; Champion, E. [Universite de Limoges (France). Fac. des Sciences et Techniques

    2009-07-01

    Incorporation of silicon (Si) ions into hydroxyapatite structure (HA) influences on physical, chemical and physiological properties. Some studies reported the improved bioactivity Si substitution, and it also accelerates the biomineralization process. The main objective of this work is to characterize stoichiometric hydroxyapatite and hydroxyapatite substituted with 1.13% in weight of Si (SiHA) using a wet precipitation method followed by a heat treatment. SEM/EDS, AFM, DRX and FTIR analyses were used to characterize the samples. EDS and FTIR results confirmed the presence of Si. Silicon induces small changes on crystal structure of HA, not detected on X-ray diffraction patterns of sintered tablets of SiHA and HA. No secondary phases were observed, that indicates the Si had entered the HA lattice. (author)

  19. Synthesis and characterization of new ionic liquids; Sintese e caracterizacao de novos liquidos ionicos

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, L.M.C. de; Mattedi, S.; Boaventura, J.S., E-mail: luanaufrn@hotmail.co [Universidade Federal da Bahia (UFBA), Salvador, BA (Brazil). Escola Politecnica. Programa de Pos-Graduacao em Engenharia Quimica; Iglesias, M. [Universidade Federal da Bahia (UFBA), Salvador, BA (Brazil). Escola Politecnica. Programa de Pos-Graduacao em Engenharia Quimica; Universidad de Santiago de Compostela (Spain). Escuela Tecnica Superior de Ingenieria. Dept. de Ingenieria Quimica

    2010-07-01

    In recent years, ionic liquids have been highlighted for its potential in various industrial applications. Among them, the salts of Broensted has a promising profile for the low toxicity, low cost and simple synthesis. This paper presents the synthesis and characterization of new salts of Bronsted with branched (lactate) or large chain anions (oleate) for future use as additives promoters of proton conductivity in fuel cells of ethanol. Experimental data were measured for density, sound velocity and conductivity of pure ionic liquids and mixtures. The density decreases linearly with increasing temperature, and sound velocity shows a similar trend, but not linear. The conductivity increases according to the Arrhenius model with activation energy less than 10 J/mol. Tests NMR, FTIR and TGA confirm ionic structure and thermal stability up to 165 deg C. (author)

  20. Mullite process and characterization for radome applications; Obtencao e caracterizacao de mulita para radomes

    Energy Technology Data Exchange (ETDEWEB)

    Silverio, G.R., E-mail: gustavorsilverio@hotmail.com [Universidade de Sao Paulo (USP/EEL/DEMAR), Lorena, SP (Brazil). Escola de Engenharia. Departamento de Engenharia de Materiais; Piorino Neto, F.; Melo, F.C.L.; Junqueira, C.C.M.; Assis, J.M.K.; Gambin, E. [Instituto de Aeronautica e Espaco (IAE/AMR/AEL), Sao Jose dos Campos, SP (Brazil)

    2012-07-01

    Mullite is an aluminosilicate with potential for application in aerospace radomes. The study was based on three compositions with sintering in air at different temperatures. The mullite formation was evaluated by X-ray diffraction Was measured Vickers hardness, density, shrinkage rate, fracture toughness was calculated and the coefficient of thermal expansion. The electromagnetic characterization was performed following the method of Hakki Colemann. Microstructural characterization was performed by scanning electron microscopy. The best results were divided into two compositions sintered at 1600 ° C and 1650 ° C with up to 97% densification. (author)

  1. Hydrogeological characterization of Itataia mine, Ceara, Brazil; Caracterizacao hidrogeologica da jazida de Itataia, CE

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Jose Roberto de Alcantara e

    2003-07-01

    This work analyzes the geological-geotechnical-geophysical behavior, aiming to define the characteristics of a karstic-fissural aquifer in the mid-northern region of the State of Ceara, named as Itataia Phosphor-Uranium Deposit. This area is constituted of marbles and gneisses from Itataia Group, which are morphologically located at a higher point to the south and at a lower point to the north, related to Paleoproterozoic Era. Fracture system led to the implantation of two karstic marble phases, being the oldest from Cambrian Period and the most recent from Tertiary/Quaternary Period. Porosity is secondary to fractures, fissures and crushed zones which act as hydraulic channels for groundwater flow. Major geophysics defined conducting lines are controlled by normal fractures and faults in both N70 deg E and N80 deg W directions, and secondarily in both N10 deg E and N30 deg W directions, dipping 70 deg -85 deg into the northern quadrant of the main axes. Fault characteristics are typical of graben and horst patterns. Rocks in the area are distributed into three classes of geotechnical massif: healthy rock, moderately altered and fractured rock, and strongly altered and fractured rock. The latter occurs predominantly in the center of the area, from the soil surface to an average depth of 150 meters. Groundwater flow is characterized by fractures which enlarged by the karstic phenomenon dissolution, and then become closer as deeper they are. This flow may be slower or even discontinue in light of silty-argillaceous alteration material that fill the open fracture gaps. Water level is not lower than 5 m or higher than 90 m, averaging by 30 m ali over the area. The synoptic piezometry map shows a general south-north direction; however in the southwestern portion - the recharge zone - it takes the south direction, while in the southeastern portion it takes the southeast direction. (author)

  2. Preparation and characterization of bentonite organo clay; Preparacao de caracterizacao de argilas bentonitas organofilicas

    Energy Technology Data Exchange (ETDEWEB)

    Bertagnolli, C.; Almeida Neto, A.F. [Universidade Estadual de Campinas (UNICAMP), SP (Brazil). Fac. de Engenharia Quimica. Lab. de Engenharia Ambiental; Silva, M.G.C., E-mail: meuris@feq.unicamp.b [Universidade Estadual de Campinas (UNICAMP), SP (Brazil). Fac. de Engenharia Quimica

    2009-07-01

    Bentonite clays organically modified have great potential use for environmental remediation, especially in the separation of organic compounds from the water. The aim of this work was the preparation of organophilic clays from 'Verde-Lodo' bentonite clay with the quaternary ammonium salts cetyl-pyridinium chloride and benzalkonium chloride. The materials obtained were characterized by XRD, thermogravimetric analyses, Helium picnometry, SEM and energy dispersive X-ray techniques. The results show consistently successful synthesis of the organoclay through the increase in the basal spacing, as well as salt elimination picks and presence of carbon and chlorine in the modified clays; they are inexistent elements in the natural clay. (author)

  3. Synthesis and characterization of biomorphic ceramics; Sintese e caracterizacao de ceramicas biomorficas

    Energy Technology Data Exchange (ETDEWEB)

    Rambo, Carlos Renato

    2001-07-01

    Biotemplating represents a recently developed technology for manufacturing of biomorphous ceramics from naturally grown plant structures. This approach allows the production of ceramic materials with cellular structure, where the microstructural features of the ceramic product are similar to the native plant. After processing, the biomorphic ceramic exhibits directed pore morphology in the micrometer range. Biomorphic SiC fibers were produced from bamboo by carbothermal reduction of SiO{sub 2} originally present in the bamboo structure. Bamboo pieces were heated up to 1500 deg C in argon to promote the reaction between carbon and silica. Biomorphic alumina, mullite and zirconia ceramics were manufactured via the sol-gel route by repeated infiltration of low viscous oxide precursors (sols) into rattan, pine and bamboo structures. The raw samples were pyrolyzed at 800 deg C in nitrogen for 1h and subsequently annealed at 1550 deg C in air. The microstructure and physical properties of the biomorphic ceramics were characterized by X-ray diffraction (XRD) and high temperature-XRD, scanning electron microscopy (SEM), porosimetry and picnometry. Thermal analysis (TGA/DTA) was performed on the infiltrated samples in order to evaluate the reactions and the total weight loss during the thermal process. The mechanical properties were evaluated by compressive strength tests. In contrast to conventional processed ceramic foam of similar porosity, the microstructure highly porous biomorphic ceramics shows uniaxial pore morphology with anisotropic properties. These properties are favorable for applications in catalyst support, filters or low-density heat insulation structures, or as biomaterials. (author)

  4. Naphthenic acid characterization and distribution in crude oils; Caracterizacao e distribuicao de acidos naftenicos em petroleos

    Energy Technology Data Exchange (ETDEWEB)

    Guimaraes, Regina C.L.; Gomes, Alexandre de O. [PETROBRAS S.A., Rio de Janeiro, RJ (Brazil)

    2008-07-01

    Naphthenic acid corrosion was observed for the first time during the distillation process of some kind of crude oils in 1920. Recent reports about naphthenic acid corrosion have been found in China, India, Venezuela, Eastern Europe, Russia and the USA. In Brazil, heavy and acid crude oil processing is rising. Some brazilian crude oils have TAN around 3,0 mg KOH/g. The presence of relatively high levels of naphthenic acids in crude oils is a bane of petroleum refiners; and more recently, of producers as well, who have reported problems during production with calcium and sodium naphthenate . Essentially, these acids which are found to greater or lesser extent in virtually all crude oils are corrosive and tend to cause equipment failures, lead to high maintenance costs and may pose environmental disposal problems. In order to give these information to PETROBRAS, The Research and Development Center of PETROBRAS (CENPES) has been working in house and with brazilian universities developing analytical technicians to know better molecular structures and distribution of these acids compounds in crude oils. This work presents the actual methods and some results from these developments. (author)

  5. Design and construction of ophthalmic simulators for clinical applications; Projeto e confeccao de simuladores oftalmicos para aplicacoes clinicas

    Energy Technology Data Exchange (ETDEWEB)

    Sanchez, Andrea

    2006-07-01

    This work presents a calculational methodology for dose determination in human eye structures, such as: sclera, choroid, retina, lens, vitreous body, optic nerve and disc, and cornea, as well as tumor due to treatment to the eye plaques. A human eye model was constructed taking into consideration its main structural and dimension characteristics. Beyond that a mathematical model for the Co-60 and 1-125 plaques with all geometric details were built employing the MCNP-4C code. This model is able to calculate the axial and radial doses in any point of the eye and for each of its structures. An acrylic eye simulator was also built with the aim to obtain experimental results for the both model validations. This simulator is made of an acrylic sphere split into foils of 1 mm thickness which allow the introduction of a radiographic film to measure the axial and radial doses. The experimental data were used to validate the MCNP-4C results. The data from the mathematical model will serve as the basis to build a data bank for all the eye structures allowing different position and sizes of tumor as well as the replacement of all ophthalmic plaques used in the treatment. This data bank will be the principal part for the construction of a national software for the dose calculation and can be of great help for a reliable treatment system planning in radiotherapy/brachytherapy. (author)

  6. Positron Emission Tomography (PET) in the oncologic clinical practice; Tomografia por Emision de Positrones (PET) en la practica clinica oncologica

    Energy Technology Data Exchange (ETDEWEB)

    Serna M, J.A.; Luviano, C.; Martinez V, D. [Hospital Angeles del Pedregal Mexico DF (Mexico); Maldonado S, A. [Centro PET Complutense, Madrid (Spain)

    2005-07-01

    We intended to determine the frequency with that the computer axial tomography (TAC), it was able to visualize the lesions extra neoplasia detected by the PET tomography in patients with fully identified primary malignant neoplasia. (Author)

  7. La day surgery centralizzata: l’appropriatezza clinica e organizzativa come leva di creazione di valore sanitario

    Directory of Open Access Journals (Sweden)

    Bruno Vogliolo

    2001-12-01

    Full Text Available In the last years Public Health Service has been trying to find out solutions in order to improve its health value added creation capacity. The implementation of the Day-surgery division mainly aims to follow that direction, since it enables the improvement of the ratio between efficacy, quality and healthcare suitability and on the other hand efficiency, costs and modality of better resources utilization. The centralization of Day-surgery activities proposes some innovative characteristics, concerning that it introduces an organizational model focused on needs and it performs the separation of the clinic and therapeutic activities from the ones involving the assistance. Both economic and qualitative advantages deriving from the changes stand out in term of: - high possibility of activities’ scheduling; - improved customer satisfaction; - rationalisation of day-hospital recovery, with positive effects on the inpatients; - improved hospital economic stability. This study was carried out with the support of the multiple-skill group composed of doctors, nurses, administrative staff as well as experts in the field of organisation with an aim to provide the full outline of the necessary competences. The proposed discussion reflects the multidisciplinary view of the problem and different perspectives. Each of them regards particular aspects and implications indicated as following: - clinical perspective, related to the possibility of day-surgery interventions both from the medical and the anaesthetic point of view; - organisational perspective, which refers to the possible day-surgery models in conjunction with the organisational model and their peculiarities; - operative perspective, which consist of the analysis of the ideal structural dimension, flows of activities among all services involved and the analysis of the productive capability; (number of necessary beds, staff dimension and a relapse of the operation activities needs; - economic perspective, focused mainly to provide the final valuation on the capacity of the project to contribute to the improvement of the hospital.

  8. Determinação da flora microbiana do centro cirurgico do Hospital de Clinicas da Universidade Federal do Parana

    OpenAIRE

    Guérios, José Roberto Ribeiro

    2013-01-01

    Resumo: Com o objetivo de determinar a flora microbiana existente no centro cirúrgico Universidade Federal do Paraná, rea1izaram-se 100 culturas para vários cirúrgico, água proveniente pública, possível contaminação. 90,0%) 30,0%) lavabos, 6 amostras (60,0%) dos laringoscópios, 6 amostras (60,0%) das sondas endotraqueais, 4 amostras (40,0%) dos tubos dos respiradores, 3 amostras (30,0%) das bacias com álcool iodado, 2 amostras (20,0%) dos campos cirúrgicos e 10 amostras (100,0%) dos colchões ...

  9. Actinomicose cerebral: observação anatomo-clinica e revisão da literatura brasileira

    Directory of Open Access Journals (Sweden)

    Luciano de Souza Queiroz

    1975-12-01

    Full Text Available Os autores relatam a observação anátomo-clínica de um paciente de 33 anos, com síndrome de hipertensão intracraniana e hemiparesia à direita. O líquido cefalorraqueano revelava discreta hipercitose linfomonocitária. A autópsia mostrou três abscessos cerebrais, com edema difuso mais intenso no hemisfério cerebral esquerdo, sem leptomeningite purulenta. O exame histopatológico demonstrou grãos actinomicóticos nos abscessos cerebrais e pulmonares. A literatura brasileira sobre neuroactinomicose é analisada, com encontro de seis casos, publicados entre 1934 e 1946. São discutidos aspectos clínicos e anátomo-patológicos relevantes dos casos nacionais.

  10. Leitura rapida do KDIGO 2012: Diretrizes para avaliacao e manuseio da doenca renal cronica na pratica clinica

    Directory of Open Access Journals (Sweden)

    Gianna Mastroianni Kirsztajn

    2014-03-01

    Full Text Available Os autores desta "leitura rápida" apresentam os dados que consideraram mais relevantes na versão 2012 do KDIGO referente à avaliação e manuseio da doença renal crônica. Não se trata da opinião dos autores, mas sim de uma apresentação mais concisa das diretrizes, que podem ser úteis na prática clínica.

  11. Calculation of the thicknesses of the walls of the radiographic inspection building of the NKS enterprise; Calculo de los espesores de los muros del edificio de inspeccion radiografica de la empresa NKS

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez A, G.; Gutierrez R, C

    1983-07-15

    During the month of February, 1983, the Structural Civil Department of the Latin American of Engineering, S.A. de C.V. company (LATISA), outline to the Engineering and Industry Applications Management of the ININ that the industrial group NKS had taken charge them the design of a building where it would lodge a linear electron accelerator of 4 MeV, one source of Co-60 of 30 Ci and an X-ray equipment, tube type, of range of 60 to 300 KV and that to make the design they required to know the necessary thickness of the walls, doors and roof to protect to the workers, outside of the building, of the X and gamma radiations generated by the sources mentioned during the radiographic inspections of metal-mechanical pieces. (Author)

  12. Correction of the counting up number by dead time in detector systems for radiograph images; Correccion del numero de conteos por tiempo muerto en sistemas detectores para imagenes radiograficas

    Energy Technology Data Exchange (ETDEWEB)

    Cerdeira E, A. [Telital Spa, Trieste (Italy); Cicuttin, A. [Laboratory of Microprocessors, ICTP-INFN, Trieste (Italy); Cerdeira, A.; Estrada, M.; Luca, A. de [Depto. de Ingenieria Electrica, 07000 Mexico D.F. (Mexico)

    2002-07-01

    The effect of the dead time in a detection system by counting up of particles and the contribution of this error in the final image resolution is analysed. It is given a statistical criteria for the optimization of electronic parameters such as dead time and counting up memory which help in the implementation of these systems with the minimum necessary characteristics which satisfy the resolution requirements. (Author)

  13. Development of practical digital radiographic image viewing and commitment dose/image quality; Desarrollo de practicas de visualizacion de imagenes radiograficas digitales y su compromiso dosis/calidad de imagen

    Energy Technology Data Exchange (ETDEWEB)

    Chinillach Ferrando, N.; Salvador, R.; Diez, S.; Reinado, D.; Cortina, T.; Lopez, F. J.; Jover, A.; Cebrian, R.; Gonzalez, R.; Dalmases, F.; Romero, C.; Rosello, J.

    2011-07-01

    Today it is essential to use X-ray diagnosis in health, so it is essential that professionals have a strong background in all aspects of radiological images dependent. It is also necessary to understand the dependence between dose and image quality and thus introduce the concept of optimization in the performance of radiologic studies, from a simple test to a complex, establishing a dependency between patient dose and the aim of the study to be performed.

  14. Determination of bone mineral density of the distal extremity of the radio in Rottweiller, by radiographic optic densitometry;Determinacao da densidade mineral ossea da extremidade distal do radio de caes da raca Rottweiller, por meio da densitometria optica radiografica

    Energy Technology Data Exchange (ETDEWEB)

    Alves, Jefferson Douglas Soares, E-mail: radiologia@unifeob.edu.b [Fundacao de Ensino Octavio Bastos (UNIFEOB), Sao Joao da Boa Vista, SP (Brazil). Fac. de Medicina e Veterinaria; Sterman, Franklin de Almeida [Universidade de Sao Paulo (USP), Butanta, SP (Brazil). Fac. de Medicina Veterinaria e Zootecnia. Dept. de Cirurgia

    2010-06-15

    This study allowed the standardization of the bone mineral density (BMD) of the distal extremity of the radio of 36 dogs adults in Rottweiler breed by radiographic optic densitometry. The limbs of the animals were radiographed with scale of aluminum that served as a reference. The radiographs images were digitalized and analyzed by a computer program for comparison of gray tones between the standard image and the image of the reference scale radiographed with the bone. Afterwards the values of density were expressed in millimeters of aluminum. Also studied the correlations between BMD and the sex, weight and external measures as the length of spine, height of the animal and circumference the distal extremity of the limb in study. The mean values and standard deviations of the bone mineral density of the distal extremity of the radio were: for the metaphyseal region the average of BMD of 7,88+-0,89 mmAl, the diaphyseal region 1 the average of BMD of 8,58+-0,80 mmAl and for diaphyseal region 2 of BMD of 9,00+-0,74 mmAl. (author)

  15. Poly(vinylpyrrolidone)/silver nanoparticles: preparation and characterization; Nanoparticulas de prata/poli(vinilpirrolidona): obtencao e caracterizacao

    Energy Technology Data Exchange (ETDEWEB)

    Andrade, P.F.; Goncalves, M.C. [Instituto de Quimica - UNICAMP, Campinas, SP (Brazil)], e-mail: patandrade@iqm.unicamp.br

    2010-07-01

    In this work silver nanoparticles were prepared by chemical reduction method using PVP as dispersant agent. The formation of silver nanoparticles was investigated by UV-vis optical spectroscopy and X-ray diffraction. FT-IR spectroscopy confirmed the formation of Ag/PVP complex. The transmission electron microscopy images indicated that the concentration of Ag{sup +} precursor influenced the nanoparticles dispersion and size distribution significantly. The results indicated that dispersed nanoparticles with uniform size distribution can be prepared by this methodology to obtain polymeric nano composites. (author)

  16. Preparation, characterization and certification of uranium isotope reference materials; Preparacao, Caracterizacao e certificacao de materiais de referencia isotopicos de uranio

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira Junior, Olivio Pereira de

    2006-07-01

    This work describes the preparation, characterization and certification of a set of uranium isotope reference materials ranging from 0.5 to 20.0 % of {sup 235}U in mass. The most important concepts of metrology in chemical measurements were applied so that the certified quantities in these materials could be directly traceable to the International System of Units (SI). As a consequence of this approach, these materials can be used in the instruments calibration, estimation of measurement uncertainty, method validation, assessment of performance of analysts, quality control routines and interlaboratory comparison programmes. The most advanced methods and techniques in mass spectrometry, that is, gas source mass spectrometry (GSMS), thermal ionisation mass spectrometry (TIMS) and inductively coupled plasma mass spectrometry (ICPMS) were investigated to identify which are the dominant components in the uncertainty and to quantify its contribution to the final value of the measurement uncertainty of the isotopic ratio. The results obtained were then compared to verify which are the methods and techniques associated to the lowest measurement uncertainty values. The isotope amount ratio n({sup 235}U)/n({sup 238}U) was certified in the materials produced to expanded uncertainties ranging from 0.02 to 0.10 % and the ratios n({sup 234}U)/n({sup 238}U) and n({sup 236}U)/n({sup 238}U), to uncertainties ranging from 0.03 to 2.20 %. These values fully comply to the requirements of the isotopic characterization of nuclear fuel as well as the analysis of environmental samples for nuclear safeguards. (author)

  17. Nickel coating electroplated characterization with and without carbon nanotubes; Caracterizacao de niquel eletrodepositado na presenca de nanotubos de carbono

    Energy Technology Data Exchange (ETDEWEB)

    Lopes, A.C.; Banczek, E.P.; Cunha, M.T.; Rodrigues, P.R.P. [Universidade Estadual do Centro-Oeste, Guarapuava, PR (Brazil). Dept. de Quimica; Costa, I. [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil); Terada, M. [Universidade de Sao Paulo (EPUSP), SP (Brazil). Escola Politecnica. Dept. de Engenharia Metalurgica e de Materiais

    2010-07-01

    The metals have great application, but when their properties are not suitable they should be improved through treatments to increase corrosion resistance, mechanical and wear. The metals electrodeposition such as nickel is one of treatment options. This study aims the development a nickel coating with and without (CNT), obtained by electrodeposition on aluminum alloy AA6061. The nickel electrodeposition was performed with cyclic voltammetry and chronoamperometry. Open circuit potential and anodic polarization curves were carried out samples characterization. The microstructure and the chemical composition of the M{sub x}O{sub z} coating were studied using the scanning electron microscopy, energy dispersion spectroscopy and X-ray diffraction. The results indicated that the nickel coating improve the corrosion resistance of aluminum in the presence of CNT. (author)

  18. Characterization of a new sealer MTA/HAp; Caracterizacao de um novo cimento endodontico MTA/HAp

    Energy Technology Data Exchange (ETDEWEB)

    Barros, C.M.B.; Oliveira, S.V.; Costa, A.C.F.M. [Universidade Federal de Campina Grande (UFCG), PB (Brazil); Dantas, D.C.R.E.; Fontes, L.B.C. [Universidade Estadual da Paraiba (UEPB), PB (Brazil); Viana, K.M.S., E-mail: kalineviana@ect.ufrn.br [Universidade Federal do Rio Grande do Norte (UFRN), Natal, RN (Brazil)

    2012-07-01

    Filling materials (cement-based calcium hydroxide, amalgam, glass ionomer and IRM) are often used as sealers. However, none of them meets the desirable characteristics of a suitable sealing material. This study aims to characterize the new sealer, MTA/HAp from the incorporation of 5% by weight of synthetic hydroxyapatite to the MTA and to investigate the influence of the addition of HAp on the characteristic structural, chemical and consistency of the MTA. For this, we used MTA Angelus ® and HAp synthesized in the laboratory. We used the ratio by mass 95%MTA/5%HAp, where the hydroxyapatite added the characteristic of the MTA osteoconduction. The tests were performed: XRD, XRF and consistency. The results showed that both the new cement had the same crystalline phases as the same chemical composition of its precursors, yet having suitable consistency (plastic mass) of a sealer as well as the pure MTA. (author)

  19. Mineralogical characterization of Brazilians attapulgite to magnetic nano composites uses; Caracterizacao mineralogica de atapulgitas brasileiras para utilizacao em nanocompositos magneticos

    Energy Technology Data Exchange (ETDEWEB)

    Middea, Antonieta; Neumann, Reiner, E-mail: amiddea@cetem.gov.br [Centro de Tecnologia Mineral - CETEM, Rio de Janeiro, RJ (Brazil); Spinelli, Luciana S.; Lucas, Elizabete F. [Universidade Federal do Rio de Janeiro, Instituto de Macromoleculas, Laboratorio de Macromoleculas e Coloides na Industria de Petroleo, Rio de Janeiro, RJ (Brazil)

    2011-07-01

    Magnetic polymeric nano composites represent a potential alternative in the treatment of contaminated water. This work aims to investigate the potential of uses of a Brazilian clay (an attapulgite), abundant in the northeast, in the preparation of polymeric nano composites for application in the removal of organic material present in aquifers, using magnetic field. The techniques used for mineralogical characterization were X-ray diffraction (XRD) and scanning electron microscopy (SEM) coupled with energy dispersive spectroscopy (EDS). The results showed the presence of palyigorskite in all samples as well as other mineral phases (quartz, kaolinite, smectite and anatase). The microscopic analysis permitted to identify the fibrous appearance of palyigorskite. The presence of palyigorskite is a strong indication of the possible use of attapulgite in obtaining magnetic nano composites by the adsorption of iron ion to the surface. (author)

  20. Synthesis and characterization of sulfonated polyesters derived from glycerol; Sintese e caracterizacao de poliesteres sulfonados obtidos a partir do glicerol

    Energy Technology Data Exchange (ETDEWEB)

    Fiuza, R.A.; Jose, N.M.; Boaventura, J.S. [Universidade Federal da Bahia (IQ/UFBA), Salvador, BA (Brazil). Inst. de Quimica; Fiuza, R.P. [Universidade Federal da Bahia (EP/UFBA), Salvador, BA (Brazil). Escola Politecnica. Curso de Mestrado em Engenharia Quimica

    2010-07-01

    In this work were synthesized polyesters from glycerol and acid sulfonated phthalic previously. The materials were characterized by DSC, TGA, FTIR, SEM, XRD and XRF. The results showed effective sulfonation of phthalic acid. The presence of sulfonic groups promoted strong changes in the crystallinity of the new material makes the lens. The polyesters made from phthalic acid sulfonated combine characteristics such as heat resistance and groups that drivers potentiate the electrolyte for application in fuel cells proton exchange membrane and also for gas separation. (author)

  1. Characterization of granite waste for use in red ceramic; Caracterizacao de residuo de granito para utilizacao em ceramica vermelha

    Energy Technology Data Exchange (ETDEWEB)

    Aguiar, M.C.; Monteiro, S.N.; Vieira, C.M.F., E-mail: mari@uenf.br [Universidade Estadual do Norte Fluminense (UENF/LAMAV), Campos dos Goytacazes, RJ (Brazil). Laboratorio de Materiais Avancados; Borlini, M.C. [Centro de Tecnologia Mineral (CETEM), Cachoeiro de Itapemirim, ES (Brazil). Centro Avancado

    2011-07-01

    This work aims to study the characterization of the granite waste from the city of Santo Antonio de Padua-RJ for the use in red ceramic. The chemical, physical and morphological characterization of the waste was performed by chemical analysis, X-ray diffraction, particle size distribution, thermal analysis and scanning electron microscopy (SEM). The results indicated that this waste is a material with great potential to be used as a component of ceramic body due to its capacity to act as flux during the firing, and to improve the properties of the ceramic when is incorporate. (author)

  2. Characterization of poly pyrrole/montmorillonite electro polymerised onto Pt; Caracterizacao de filmes PPy/montmorilonita eletropolimerizados sobre Pt

    Energy Technology Data Exchange (ETDEWEB)

    Castagno, K.R.L., E-mail: katiarlc@pelotas.ifsul.edu.b [Instituto Federal Sul-rio-grandense (IFSul), RS (Brazil). Dept. de Quimica; Azambuja, D.S.; Dalmoro, V.; Mauller, R.S. [Universidade Federal do Rio Grande do Sul (UFRGS), Pelotas, RS (Brazil). Inst. de Quimica

    2010-07-01

    In this study films of polypyrrole/montmorillonite (PPy/MT) were electropolymerized on platinum in order to evaluate the performance of this technique in the preparation of nanocomposite materials and to determine the thermal properties and conductivity of the composites. The films were synthesized from a solution containing pyrrole, dodecylbenzene sulfonate, acid and two types of clays: montmorillonite-Na + (MT-Na) and montmorillonite-30B (MT-M). The characterization of the films we have used FT-IR, TEM, XRD, TGA, DSC and resistivity measurement by the four-point van der Pauw method. The study showed that the adopted method of exfoliation and the electropolymerization method used, allows obtaining nanocomposite materials. Analyses of FT-IR, TEM and XRD show that the clays are exfoliated in the polymer matrix. Thermal analysis of the films indicates that the addition of clay reflects an enhancement in the thermal properties of the matrix of PPy, but decreases the conductivity of the same. (author)

  3. Preparation and characterization of hybrid materials from natural chrysotile; Preparacao e caracterizacao de materiais hibridos a partir da crisotila natural

    Energy Technology Data Exchange (ETDEWEB)

    Giraldelli, M.G.; Silva, M.L.C.P., E-mail: marciogiraldelli@hotmail.co [Universidade de Sao Paulo (EEL/USP), Lorena, SP (Brazil). Escola de Engenharia

    2010-07-01

    Special attention has been given to the development of new materials from natural chrysotile. This fiber has about 40% silicon oxide in its structure with an outer layer of brucite (MgOH{sub 2}). With the aim of obtaining a material with a more uniform structure, acid leaching was performed to remove the outer layer of brucite, resulting in a silicon oxide hydrate. This material was used as support for the deposition of Nb{sub 2}O{sub 5}.nH{sub 2}O. The Nb{sub 2}O{sub 5}.nH{sub 2}O was prepared by conventional precipitation using as starting material niobium metallic. In this study, we performed the synthesis and characterization of the material SiO{sub 2}.nH{sub 2}O / Nb{sub 2}O{sub 5}.nH{sub 2}O 1:1. Both chrysotile as niobium are widely available national resources, which confirms the economic viability of resource use. The materials studied were characterized by XRD, SEM and TG/DTG. (author)

  4. Characterization of AA7050 aluminium alloy processed by ECAP; Caracterizacao da liga de aluminio AA7050 processada por ECAP

    Energy Technology Data Exchange (ETDEWEB)

    Cardoso, K.R.; Guido, V. [Universidade do Vale do Paraiba (UNIVAP), Sao Jose dos Campos, SP (Brazil). Inst. de Pesquisa e Desenvolvimento; Travessa, D.N. [Empresa Brasileira de Aeronautica (EMBRAER), Sao Jose dos Campos, SP (Brazil); Jorge Junior, A.M. [Universidade Federal de Sao Carlos (DEMa/UFSCar), SP (Brazil). Dept. de Engenharia de Materiais

    2010-07-01

    The commercial AA7050 aluminium alloy in the solution heat treated condition (W) was processed by ECAP through route A. Two pressing temperatures (room and 150 deg C and velocities (5 and 30mm/min) were used, as well as different number of passes. The effect of such variables on the microstructure evolution was evaluated using optical and transmission electron microscopy with EDX microanalysis, and xray diffraction. It was found that the microstructure has been refined by ECAP, as a result of subgrains formed within deformation bands. ECAP at 150 deg C resulted in intense precipitation of plate like {eta} phase, which evolves to equiaxial morphology as the number of passes increases. (author)

  5. Synthesis, characterization and thermal behavior of rare earth amido sulfonates; Sintese, caracterizacao e comportamento termico de amidossulfonatos de terras raras

    Energy Technology Data Exchange (ETDEWEB)

    Luiz, Jose Marques; Nunes, Ronaldo Spezia, E-mail: jmluiz@feg.unesp.br [Universidade Estadual Paulista Julio Mesquita Filho (UNESP), Guaratingueta, SP (Brazil). Faculdade de Engenharia. Departamento de Fisica e Quimica; Matos, Jivaldo do Rosario [Universidade de Sao Paulo (USP), SP (Brazil). Instituto de Quimica

    2013-09-01

    Hydrated compounds prepared in aqueous solution by reaction between amidosulfonic acid [H{sub 3}NSO{sub 3}] and suspensions of rare earth hydroxycarbonates [Ln{sub 2}(OH){sub x}(CO{sub 3}){sub y}.zH{sub 2}O] were characterized by elemental analysis (% Ln, % N and % H), infrared spectroscopy (FTIR) and thermogravimetry (TG). The compounds presented the stoichiometry Ln(NH{sub 2}SO{sub 3}){sub 3}.xH{sub 2}O (where x = 1, 5, 2.0 or 3.0). The IR spectra showed absorptions characteristic of H{sub 2}O molecules and NH{sub 2}SO{sub 3} groups. Degree of hydration, thermal decomposition steps and formation of stable intermediates of the type [Ln{sub 2}(SO{sub 4}){sub 3}] and (Ln{sub 2}O{sub 2}SO{sub 4}), besides formation of their oxides, was determined by thermogravimetry. (author)

  6. Rheological characterization of nanocomposites Nylon 6/bentonite clay; Caracterizacao reologica de nanocompositos de poliamida 6/argila bentonitica

    Energy Technology Data Exchange (ETDEWEB)

    Silva, T.R.G.; Fernandes, P.C.; Oliveira, S.V., E-mail: taci_gouveia@yahoo.com.b [Universidade Federal de Campina Grande (UFCG), PB (Brazil). Curso de Pos-Graduacao em Ciencia e Engenharia de Materiais; Araujo, E.M.; Melo, T.J.A. [Universidade Federal de Campina Grande (UFCG), PB (Brazil). Unidade Academica de Engenharia de Materiais

    2010-07-01

    Polymer nanocomposites are a class of materials that have been widely used in various applications. Among them, has been emphasizing the preparation of polymer films with barrier properties for applications in polymer membranes. In this work, nanocomposites of nylon 6/bentonite clay were obtained from a Homogenizer, in the ratios of 1, 3 and 5 wt% clay. The Brasgel PA bentonite clay was treated organically with Praepagen HY salt, to make it organophilic. By X-ray diffraction (XRD), it was showed that the efficiency of the incorporation of salt in the clay. The rheological curves showed that for the AST clay the torque did not change when compared with the pure nylon 6, while for the clay ACT, the torque increased gradually with the percentage of clay. (author)

  7. Synthesis and characterization of type silicoaluminophosphates catalytic support; Sintese e caracterizacao de suportes cataliticos do tipo silicoaluminofosfatico

    Energy Technology Data Exchange (ETDEWEB)

    Leite, C.E.T.; Carvalho, M.W.N.C.; Pereira, K.R.O., E-mail: carlosedisio@hotmail.co [Universidade Federal de Campina Grande (UFCG), PB (Brazil). Unidade Academica de Engenharia Quimica. Lab. de Catalise, Adsorcao e Biocombustiveis

    2010-07-01

    The refining processes, the catalytic hydrocracking is the future of diesel oil in Brazil and the first units are already scheduled to be inaugurated. Among the catalysts used in this process, silicoaluminophosphates (SAPO's) have considerable potential for use as they have been effective in the isomerization of n-alkanes, the isomerization of olefins and alkylation of aromatics. Because of this, the objective is to develop catalysts that will be used in hydrocracking reactions. The media like SAPO-5 were synthesized with different ratios silicon/aluminum, which is used as a catalytic support and have the function of crack organic molecules, since it has acidic character. The materials were characterized by techniques: X-ray diffraction, chemical analysis and textural by BET. After summarizing the media found that they had agreements with the crystalline phases presented in the literature.(author)

  8. Synthesis and characterization of hydroxyapatite-doped silver nanoparticles; Sintese e caracterizacao de hidroxiapatita dopada com nanoparticulas de prata

    Energy Technology Data Exchange (ETDEWEB)

    Andrade, Flavio Augusto Cavadas da Silva; Rollo, Joao Manuel Domingos de Almeida, E-mail: flavio.andrade@usp.br [Universidade de Sao Paulo (EESC/FMRP/IQSC/USP), Sao Carlos, SP (Brazil). Programa de Pos-Graduacao Interunidades Bioengenharia; Rigo, Eliana Cristina da Silva; Vercik, Andres; Vercik, Luci Cristina de Oliveira; Valencia, German Ayala; Ferreira, Leticcia Gaviao [Universidade de Sao Paulo (USP), Pirassununga, SP (Brazil). Faculdade de Zootecnia e Engenharia de Alimentos. Departamento de Ciencias Basicas

    2012-07-01

    Hydroxyapatite-doped silver nanoparticles was obtained by immersing the powder in increasing dilutions of a solution containing AGNPS which were synthesized in different times and were characterized by UV-vis spectroscopy. The X-ray diffraction (XRD)studies demonstrate no change in the major phase of HA. Scanning Electron Microscopy (SEM) revealed morphological characteristics of powders after doping and the presence of silver was confirmed by energy dispersive X-ray (EDAX) analysis.The antibacterial effect of the doped powders was evaluated using strain of Staphylococcus aureus by disc-diffusion test. The zone of inhibition was found to vary with the amount of silver nanoparticle in the doped powder even for low concentrations of AgNPs. These results indicate that the method of immersion hydroxyapatite in solutions containing AgNPs is promising to obtain bioactive materials with low cytotoxicity and antibacterial effects. (author)

  9. Characterization of products of combustion of mineral coal; Caracterizacao de produtos solidos da combustao do carvao mineral

    Energy Technology Data Exchange (ETDEWEB)

    Pinheiro, H.S.; Albuquerque, J. S. V.; Sales, J.C.; Nogueira, R.E.F.Q., E-mail: hs.pinheiro@metalmat.ufc.br [Universidade Federal do Ceara (UFCE), Fortaleza, CE (Brazil). Centro de Tecnologia. Departamento de Engenharia Metalurgica e de Materiais

    2011-07-01

    During the burning of coal in power plants, various types of waste or by products are generated. These materials have been the subject of several studies. They contain ashes and have many technological applications, such as in the production of various types of ceramic pieces. The objective of this work was to study the feasibility of adding the coal combustion products as filler for ceramics. X-ray fluorescence analysis was used to identify and quantify the proportions of the elements contained in the sample and x-ray diffraction to identify the phases present. The analysis by X-ray diffraction revealed a diffraction pattern of silicon sulfide, calcium silicate and sulfide phases of Aluminium, Potassium and Titanium. X-ray fluorescence analysis showed silica (37.14%), calcium (21.86%), aluminum (14.69%) and sulfur (8.70%). These results show characteristics of materials with potential for incorporation in ceramic bodies, provided that some processing is done to eliminate the sulfur. (author)

  10. Chemistry characterization and samples beryllium process impurity determination; Caracterizacao quimica e determinacao de impurezas de amostras de processo de berilio

    Energy Technology Data Exchange (ETDEWEB)

    Carvalho, Leonel Mathry de

    1992-12-01

    Brazil is the greatest world producer of beryl (3 Be O.Al{sub 2}O{sub 3}.6SiO{sub 2}) and has recently begun to produce beryllium compounds by means of a pilot plant constructed at Governador Valadares city (Minas Gerais - Brazil). The aim of this work was the determination of trace level impurities and macro constituents in the tenth % range to support analytical control process of plant production and characterization of beryllium compounds. The impurities separations and purification process was developed by two steps procedure. The first one using EDTA complexation has separated and reduced some impurities to less than 1 {mu}g/ml level. In the second one it was used a chelating resin (Chelex 100) and the separation efficiency was about 75 to 97 % related with the element tested. High pure berylium oxide standard was obtained from purification of Be(OH)2. The R X fluorescence presented only traces of Cu and Si < 1 % Fe and Mn, Zn, Ca, Al, Na and S were completely removed. The beryllium content was determined by direct atomic emission spectroscopy in argon plasma (Dcp) and compared with classic gravimetric method as Be O. The results were in agreement (49,2+/-0,2 % and 48,3+/-0,1 % respectively) between 95 % of confidence. A low temperature gravimetric method for beryllium determination was also studied using Oxine with microwave furnace. A total of 24 elements including macro and trace level were determined by Dcp and/or spectrophotometric methods. The Be/B separation was studied using anionic resin in poly alcohols medium. A more detailed study of equilibrium conditions is necessary. This work was realized at Laboratorio de Analise Mineral (LAM) of Comissao Nacional de Energia Nuclear - Rio de Janeiro (CNEN). (author)

  11. Characterization of electric arc furnace dust aiming reuse; Caracterizacao da poeira de aciaria eletrica visando o seu reaproveitamento

    Energy Technology Data Exchange (ETDEWEB)

    Grillo, F.F.; Oliveira, E.B.G.; Oliveira, J.R. de, E-mail: fgrillo@ifes.edu.b [Instituto Federal de Ciencia e Tecnologia do Espirito Santo (IFES), Vitoria, ES (Brazil); Telles, V.B.; Tenorio, J.A.S. [Universidade de Sao Paulo (USP), SP (Brazil)

    2010-07-01

    This work aims to study the characterize of steelmaking dust, from the primary refining of steel in Electric Arc Furnace, in order to verify feasibility of reuse through the addition of hot metal in the form of briquette. The techniques used to characterize the dust was chemical analyses, size separation tests, X-ray diffraction analyses (XRD), Scanning Electron Microscopy (SEM). After characterization, was the calculation of reductant considering the complete reduction of iron oxides and then to briquetting. The waste sample is composed essentially of spherical particles and has a very small particle size (85% below 10 {mu}m). The XRD has presented compounds such as ZnFe{sub 2}O{sub 4}, Fe{sub 3}O{sub 4}, ZnO e SiO{sub 2}. This work showed that its possible recovery approximately 92% of metal iron from dust generated during steelmaking.This (author)

  12. Characterization of the inclusion complex ropivacaine: {beta}-cyclodextrin; Caracterizacao do complexo de inclusso ropivacaina: {beta}-ciclodextrina

    Energy Technology Data Exchange (ETDEWEB)

    Fraceto, Leonardo Fernandes [Universidade Estadual Paulista Julio de Mesquita Filho, Sorocaba, SP (Brazil). Dept. de Engenharia Ambiental]. E-mail: leonardo@sorocaba.unesp.br; Goncalves, Marcos Moises [Universidade de Sorocaba, SP (Brazil); Moraes, Carolina Morales; Araujo, Daniele Ribeiro de; Zanella, Luciana; Paula, Eneida de [Universidade Estadual de Campinas (UNICAMP), Campinas, SP (Brazil). Inst. de Biologia. Dept. de Bioquimica; Pertinhez, Thelma de Aguiar [Universidade de Parma (Italy). Dept. de Medicina Experimental

    2007-09-15

    Ropivacaine (RVC) is a widely used local anesthetic. The complexation of RVC with {beta}-cyclodextrin ({beta}-CD) is of great interest for the development of more efficient local anesthetic formulations. The present work focuses on the characterization of the RVC:{beta}-CD complex by nuclear magnetic resonance (NMR). The stoichiometry of the complex is 1:2 RVC:{beta}-CD. DOSY-NMR shows that the association constant is 55.5 M{sup -1}. Longitudinal relaxation time results show that RVC changes its mobility in the presence of {beta}-CD. This study is focused on the physicochemical characterization of inclusion complexes that are potentials options for pain treatment. (author)

  13. Characterization of ionizing radiation effects on human skin allografts; Caracterizacao dos efeitos da radiacao ionizante em pele humana para aloenxerto

    Energy Technology Data Exchange (ETDEWEB)

    Bourroul, Selma Cecilia

    2004-07-01

    The skin has a fundamental role in the viability of the human body. In the cases of extensive wounds, allograft skin provides an alternative to cover temporarily the damaged areas. After donor screening and preservation in glycerol (above 85%), the skin can be stored in the Skin Banks. The glycerol at this concentration has a bacteriostatic effect after certain time of preservation. On the other hand, skin sterilization by ionizing radiation may reduces the quarantine period for transplantation in patients and its safety is considered excellent. The objectives of this work were to establish procedures using two sources of ionizing radiation for sterilization of human skin allograft, and to evaluate the skin after gamma and electron beam irradiation. The analysis of stress-strain intended to verify possible effects of the radiation on the structure of preserved grafts. Skin samples were submitted to doses of 25 kGy and 50 kGy in an irradiator of {sup 60}Co and in an electron beam accelerator. Morphology and ultra-structure studies were also accomplished. The samples irradiated with a dose of 25 kGy seemed to maintain the bio mechanic characteristics. The gamma irradiated samples with a dose of 50 kGy and submitted to an electron beam at doses of 25 kGy and 50 kGy presented significant differences in the values of the elasticity modulus, in relation to the control. The analysis of the ultramicrographies revealed modifications in the structure and alterations in the pattern of collagen fibrils periodicity of the irradiated samples. (author)

  14. Bauxite and bauxite residue, characterization and electron microscopy study; Bauxita e seu residuo, caracterizacao e estudo por microscopia eletronica

    Energy Technology Data Exchange (ETDEWEB)

    Antunes, M.L.P.; Conceicao, F.T., E-mail: malu@sorocaba.unesp.br [Universidade Estadual Paulista Julio de Mesquita Filho (UNESP), Sorocaba, SP (Brazil); Toledo, S.P.; Kiyohara, P.K. [Universidade de Sao Paulo (IF/LME/USP), SP (Brazil)

    2012-07-01

    Through the Bayer process, bauxite is refined and alumina is produced. In this process, a highly alkaline residue, red mud is generated and its disposal represents an environmental problem. The aim of this paper is to present the characterization of Brazilian bauxite and Brazilian red mud by: X-ray diffraction, specific surface area, chemical composition analysis by ICP-MS, transmission electron microscopy (TEM) and energy dispersive X-ray spectrometry (EDS), and scanning electron microscopy (SEM) and discuss possible applications of this residue. The results identify as a constituent of both materials: Al{sub 2}O{sub 3}, Fe{sub 2}O{sub 3}, TiO{sub 2} and SiO{sub 2} and the presence of Na{sub 2}O in residue. The analysis by electron microscopy of Bauxite shows particles with hexagonal shape and red mud shows small particles size. (author)

  15. Characterization of clay of Santa Maria Madalena-RJ (Brazil); Caracterizacao do solo do municipio de Santa Maria Madalena

    Energy Technology Data Exchange (ETDEWEB)

    Freitas, R.A.; Borges, B.F.; Rosario, S. do; Alexandre, J.; Beiral, W.V.; Anderson, R.B.; Pessanha, E.F., E-mail: jonas@uenf.br, E-mail: wevuenf@yahoo.com.br [Universidade Estadual do Norte Fluminense Darcy Ribeiro (LECIV/UENF), Campos dos Goytacazes, RJ (Brazil). Laboratorio de Engenharia Civil

    2011-07-01

    The city of Santa Maria Madalena, located in the mountainous region of Rio de Janeiro State, has a region of rocky and extensive area of native forest. Its economy is primarily intended for farming, agriculture and tourism. Characterization studies were conducted in this region, aiming to determine the optimal production process for its application in the ceramics industry. The tests were conducted in the laboratories of the Universidade Estadual Norte Fluminense Darcy Ribeiro - UENF and were determined and the physical, chemical and mineralogical characteristic. Were performed Granulometric Analysis, Atterberg Limit, Chemical Analysis, X Ray Diffraction. The specimens used in evidence were extruded and then fired at the following temperatures: 750 ° C and 850 ° C, and subsequently conducted measurements of absorption, linear shrinkage and resistance to flexion-compression. (author)

  16. Characterization of natural fiber from agricultural-industrial residues; Caracterizacao de fibras naturais provenientes de residuos agroindustriais

    Energy Technology Data Exchange (ETDEWEB)

    Prado, Karen S.; Spinace, Marcia A.S., E-mail: marcia.spinace@ufabc.edu.br [Centro de Ciencias Naturais e Humanas, CCNH, Universidade Federal do ABC - UFABC, Campus de Santo Andre, SP (Brazil)

    2011-07-01

    Natural fibers show great potential for application in polymer composites. However, instead of the production of inputs for this purpose, an alternative that can also minimize solid waste generation is the use of agro-industrial waste for this purpose, such as waste-fiber textiles, rice husks residues and pineapple crowns. In this work the characterization of these three residues and evaluate their properties in order to direct the application of polymer composites. Was analyzed the moisture, density, scanning electron microscopy, X-ray diffraction and thermogravimetric analysis of the fibers. The results show that the use of these wastes is feasible both from an environmental standpoint and because its properties suitable for this application. (author)

  17. Characterization of film-converter screens systems for neutron radiography; Caracterizacao de sistemas filme-conversor para radiografia com neutrons

    Energy Technology Data Exchange (ETDEWEB)

    Andrade, Marcos Leandro Garcia

    2002-07-01

    In general a good quality radiography is that one able to furnish high contrast and sharp edge images. Technically 'high contrast' means high capability to discern material thickness and 'sharp edges', high resolution power. In the present work the optimal conditions to obtain neutron radiography images by using the following film-converter screen systems, Kodak-AA/Gd vaporated; Kodak-AA/Gd metallic; Kodak-AA/LiF; Min-R/GdS{sub 2}O{sub 4}, have been determined. The irradiations were performed in a radiographic facility which was designed and constructed by the neutron radiography working group and is installed at the beamhole 08 of the IEA-R1 nuclear research reactor of the IPEN-CNEN/SP. In order to determine such conditions, the start point was to evaluate the neutron exposure interval for which the optical contrast is maximal and so quantify the sensitivity or capability to discern material thickness, as well as the spatial resolution achieved in the radiographic image, for these systems. The best results have been obtained for the Kodak-AA/Gd vaporated system which is able to discern, for example, 0,024 cm of lucite, with a maximal resolution of 22{mu}m. The radiography images presently obtained in IPEN-CNEN/SP have similar quality when compared to the ones from several other research centers, around the world, whose making use of the same film-converter screens systems. (author)

  18. Extraction and characterization of crude oil asphaltenes sub fractions; Extracao e caracterizacao de subfracoes de asfaltenos de petroleo

    Energy Technology Data Exchange (ETDEWEB)

    Ferreira, Silas R.; Calado, Lucas S.; Honse, Siller O.; Mansur, Claudia R.E.; Lucas, Elizabete F., E-mail: silas@ima.ufrj.br [Universidade Federal do Rio de Janeiro, Instituto de Macromoleculas, Laboratorio de Macromoleculas e Coloides na Industria de Petroleo, Rio de Janeiro, RJ (Brazil)

    2011-07-01

    Asphaltenes from crude oil have been studied for a long time. However, until today their chemical structures and physical-chemical properties are not well established. Nowadays, it is accepted that asphaltenes are dispersed in the crude oil as macro structures, which are mainly constituted of some condensed aromatic rings (about 6-20), containing aliphatic or naphthenic groups. The asphaltenes are also defined as the crude oil fraction that is insoluble in low molar mass n-alkanes and soluble in aromatic solvents, like benzene and toluene In order to investigate the molecular structure, in this work the asphaltenes were separated by using a different procedure as that normally described in the literature and characterized by infrared spectrometry, nuclear magnetic resonance, x-ray fluorescence, elemental analyses and particle size and size distribution. The difference in subfractions polarity can be attributed not only to the aromaticity changes but also to the content of elements, such as N, O, Fe, V, Si e Ni. (author)

  19. Synthesis and characterization of tungsten or calcium doped PZT ceramics; Sintese e caracterizacao do PZT dopado com W ou Ca

    Energy Technology Data Exchange (ETDEWEB)

    Santos, D.M.; Caracas, L.B.; Noronha, R.G.; Santos, M.M.T. dos [Universidade Federal do Maranhao (UFMA), Sao Luis, MA (Brazil). Dept. de Desenho e Tecnologia. Curso de Desenho Industrial; Paiva-Santos, C.O., E-mail: denilson@ufma.b [Universidade Estadual Paulista (IQ/UNESP), Araraquara, SP (Brazil). Inst. de Quimica

    2009-07-01

    Pure and doped (tungsten or calcium) PZT ceramics were prepared by association of the polymeric precursor and partial oxalate method. The phase formation was investigated by thermal analysis (TG/DSC) and X-ray diffraction (XRD). The affect of W or Ca doping PZT and their electrical properties was evaluated. Substitution of W by Ti and Ca by Pb leads to an increase of Curie temperature and broadening of dielectric constant. A typical hysteresis loop was observed at room temperature and the remnant polarization was increased with the content of W and Ca. (author)

  20. Production and characterization of poly(styrene-co-methylmethacrylate);Producao e caracterizacao de poliestireno-co-metacrilato de metila

    Energy Technology Data Exchange (ETDEWEB)

    Augustinho, Tiago R.; Coan, Thais; Abarca, Silvia A.C.; Testoni, Alex A.S.; Baumgarten, Bruno P.; Machado, Ricardo A.F., E-mail: tiagoqmc@gmail.co [Universidade Federal de Santa Catarina (UFSC), Florianopolis (Brazil). Dept. de Engenharia Quimica e Alimentos

    2009-07-01

    Polystyrene (PS) is a polymer used in diverse industrial segments. It is easy to process and has a low cost when compared to other materials. However, PS has low mechanical resistance, which limits its application in some areas. Thus, a methodology that is sufficiently used is the synthesis of a copolymer, formed of two or more monomers to get products that have characteristics that are not possible to obtain with only one monomer. In this work, the styrene and methyl methacrylate monomers had been carried through reactions of copolymerization by means of polymerization in suspension using (MMA) with styrene in a bigger percentage. MMA was selected for being a monomer that results in a polymeric configuration more resistant than the PS. The copolymerization was proven to occur by infra-red spectroscopy (IR) and Nuclear Magnetic Resonance (NMR). Different analyses were performed using different initiators, weight molar and conversion studies. (author)

  1. Development and characterization of the lead iodide semiconductor detector; Desenvolvimento e caracterizacao do detector semicondutor de iodeto de chumbo

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Icimone Braga de

    2001-07-01

    A methodology for purification and growth of PbI{sub 2} crystal as well as for its characterization as a room temperature radiation detector was developed in this work. Commercial salts were purified using the zone refining method and, for the purified material growth, the Bridgman method was used. To calculate the purification efficiency, studies of the decrease impurities concentrations were made in the salts and in three sections of the materials purified, using the neutron activation analysis technique. The results showed that the impurities segregate preferentially in the ingot final section. A significant decrease of the impurities concentration in function of the purification pass number was observed. The grown crystals presented good crystalline quality according to the results of the X-ray diffraction analysis. To evaluate the crystal as a semiconductor detector, measurements of dark leakage current, resistivity and the response of ({sup 241}Am) alpha particle and ({sup 241}Am, {sup 57}Co, {sup 133}Ba and {sup 137}Cs) gamma rays were carried out. The radiation response is strongly dependent on the crystals purity. The crystals purified with 500 passes exhibited energy resolution of 10% for {sup 241} Am alpha particle and the gamma rays resolution was compatible with the literature. The photosensibility of the PbI{sub 2} crystal found in the wavelength from 400 to 600 nm range suggests an another application at this crystal as a photodetector to be coupled to scintillators. (author)

  2. Dosimetric characterization of a commercial two-dimensional array detector; Caracterizacao dosimetrica de um detector matricial bidimensional comercial

    Energy Technology Data Exchange (ETDEWEB)

    Gialluisi, Bruno L.; Santos, Gabriela R. dos; Sales, Camila P. de; Resende, Guilherme R.A.; Habitzreuter, Angela B.; Rodrigues, Laura N., E-mail: brunogialluisi@gmail.com [Universidade de Sao Paulo (HCFMRP/USP), Sao Paulo, SP (Brazil). Hospital das Clinicas. Servico de Radioterapia

    2013-04-15

    This paper investigates the dosimetric characteristics and performance of an array detector commercially available. The device is the I'mRT MatriXX® which is a two-dimensional detector array used in the verification of complex radiotherapy plans. It consists of 1,020 parallel plate ion chamber arranged in a 32x32 grid. Dose linearity was studied and its response was linear within the range of 5 to 1000 MU (R{sup 2} = 1). Dose rate dependence showed a maximum deviation of 0,62% comparatively with readings to 320 cGy/min. The detector stability was verified through repeated irradiations. Output factors matched well with measurements made with a Farmer chamber with an average deviation of 1,54%. The detector's effective point of measurement was determined and the inverse square law was also verified with a percentage deviation smaller than 3%. The results show that this detector can be used for quality control in IMRT thus reducing the time spent in the dosimetric verification of radiation fields. (author)

  3. XPS utilization in the characterization of glycerol based polyesters; Utilizacao de XPS na caracterizacao de poliesteres a base de glicerol

    Energy Technology Data Exchange (ETDEWEB)

    Brioude, M.M.; Miranda, C.S.; Pereira, R.; Ohara, L.; Bargiela, P.; Rocha, M.G.M.C.; Jose, N.M., E-mail: mgcr@ufba.b [Universidade Federal da Bahia (UFBA), Salvador, BA (Brazil). Escola Politecnica. Inst. de Quimica

    2010-07-01

    X-ray photoelectron spectroscopy-XPS allows the determination of all elements of the periodical table, except hydrogen and helium, and is a very used technique for the polymers characterization, its spectra constitutes a 'fingerprint' of the material. Two samples of polymers were prepared from glycerol and fumaric acid and glycerol and terephthalic acid, with a molar ratio of 1:1 and 1:1.5. The general spectra show the presence of carbon and oxygen, the main components of the polymer. From the binding energies values of the C1s and O1s high resolution spectra it was possible to determine the carbon functional groups. Their concentration were determined and the presence of the aromatic carbon in the terephthalic polyesters was observed, and also similar proportions of aliphatic carbon and ester groups in the fumaric acid polyesters. For both polyesters, an amount of carboxyl group appears, indicating the terminal non-reacted groups. These results were confirmed qualitatively by FTIR. (author)

  4. Obtaining and characterization of composites PHBV/attapulgite;Obtencao e caracterizacao de compositos de PHBV/atapulgita

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Liliane C.A.; Thire, Rossana M.S.M., E-mail: lilianealcantara@ms [Universidade Federal de Sergipe (UFS), Sao Cristovao, SE (Brazil); Barreto, Ledjane S. [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil)

    2009-07-01

    In this paper, poly (3-hydroxybutyrate-co-3-hydroxyvalerate)/attapulgite (PHBV/AT) composites were prepared by solution intercalation method. The microstructure and thermal properties of the composites were studied by X-ray diffraction and thermogravimetric analyses. Experimental results suggest the insertion of the polymeric chains in the channels of the clay. There were no significant changes in the thermogravimetric profile of the films due to the presence of attapulgite. (author)

  5. Preparation and characterization of the fish reference material; Preparacao e caracterizacao de um material de referencia de peixe

    Energy Technology Data Exchange (ETDEWEB)

    Ulrich, Joao Cristiano

    2011-07-01

    The certified reference materials (CRMs) play an important role in obtaining measurement results traceable to the International System of Units, through an unbroken chain of comparisons. Thus, the demand for new certified reference materials (CRMs) increases every day in all areas of knowledge. The availability of reference materials, mainly in Brazil is still incipient, given that the demand far exceeds the available variety of these materials. The amount of certified reference materials available in the country is insufficient to meet the need of the scientific community and demands for development of new methodologies. Among the many areas in need of reference materials, we highlight the importance for the food trade balance for these products within the country. The certification of food products, intended both for export and for domestic consumption, requires analysis methods that provide precise and accurate results to ensure product quality. This paper describes the preparation and certification of a reference material in the fish matrix in mercury and methylmercury. The study brings together since the stage of material selection, preparation, development of homogeneity and stability studies and characterization. The certification was performed by means of measurements using two analytical techniques, flow injection analysis - cold vapor atomic absorption spectrometry (FIA-CV-AAS) and isotope dilution applied to mass spectrometry (IDMS), which is a primary method. In this work the standards of the ISO 30 (ABNT 30-34) and ISO Guide 35 was used as the basis for the preparation and characterization of the material. For the calculation of uncertainties was used the GUM and Eurachem guide. As a result, was produced and certified a lot of material in relation to the concentration of mercury (Hg = 0.271 {+-} 0.057 mg g{sup -1}) and methylmercury (MeHg = 0.245 {+-} 0.038 mg g{sup -1}), and informational values of lead and arsenic. (author)

  6. Development of software for management of radioactive waste in biological research and clinical assistance; Desenvolvimento do software para gerenciamento de rejeitos radioativos em pesquisa biologica e assistencia clinica

    Energy Technology Data Exchange (ETDEWEB)

    Maciel, Bianca; Mattos, Maria Fernanda S.S.; Medeiros, Regina B. [Universidade Federal de Sao Paulo (UNIFESP/EPM), Sao Paulo, SP (Brazil). Dept. de Diagnostico por Imagem. Nucleo de Protecao Radiologica; Franca Junior, Jose Antonio de, E-mail: fernanda@cfhr.epm.b, E-mail: rbitelli@cfhr.epm.b, E-mail: jafjunior@unifesp.b [Universidade Federal de Sao Paulo (UNIFESP/EPM), Sao Paulo, SP (Brazil). Dept. de Tecnologia da Informacao. Div. de Sistema de Informacao

    2011-10-26

    This paper describes the development of software which facilitates the automation of this process by mean of the Safety Analysis Report generating a data base allowing the statistic analysis and elaboration of radioactive wastes inventory. The software was developed in PHP language and the information is stored in a data base generated in Oracle and organized in different tables which allows to calculate the storage time of waste and to register the specificities of radioisotopes, cadastral data of the professionals which handle that radioisotope and also the characteristics of handling laboratories. That tool collaborates for a effective control on the use of radioisotopes in research laboratories and assistance areas as well

  7. Hepatic hemangio-endothelioma: radiological findings and clinical evolution of a case; Hemangioendotelioma hepatico: aspectos radiologicos e evolucao clinica de um caso

    Energy Technology Data Exchange (ETDEWEB)

    Carvalho Neto, Arnolfo de; Souza, Carolina Althoff; Yanaga, Ricardo Hideki [Parana Univ., Curitiba, PR (Brazil). Hospital de Clinicas. Servico de Radiologia; Albonei, Mara [Parana Univ., Curitiba, PR (Brazil). Hospital de Clinicas. Dept. de Pediatria]. E-mail: carolina_althoff@hotmail.com

    2003-02-01

    Vascular tumors encompass a spectrum of lesions, which may vary from benign hemangiomas to malignant angio sarcomas. Hemangio-endotheliomas can be considered intermediary between these two types of lesions. We report a case of hepatic hemangio endothelioma in a newborn female and review the most important aspects of this disease. (author)

  8. Trattamento fisioterapico secondo le linee guida KNGF Vs trattamento di ginnastica dolce nella malattia di Parkinson: valutazione clinica in studio randomizzato

    OpenAIRE

    Dipasquale, .

    2010-01-01

    ABSTRACT Objectives: To obtain preliminary data on the effects of specific physiotherapy in Parkinson Disease (PD) and to determine whether improved performance is accompanied by reduction of disability, improvement of the quality of life, improvement of mood, reduction of pain, improvement of walk (speed and number of footsteps), reduction of falls. Design: randomised controlled trial Setting: Melegnano Hospital – Neurology Departement Participants:40 patients with PD, 2 years...

  9. La farmacoutilizzazione delle statine nella pratica clinica: risultati di uno studio di popolazione condotto su database amministrativi e di medici di medicina generale

    Directory of Open Access Journals (Sweden)

    Mirko Di Martino

    2003-05-01

    Full Text Available In spite of findings of large-scale clinical trials which showed an overall reduction of morbidity and mortality from coronary heart disease in patients treated with 3-hydroxy-3-metylglutaryl coenzyme-A reductase inhibitors (statins, relatively little is still known about the real prevalence of treatment in general practice setting, particularly in patients with a high cardiovascular risk. The objective of this study was to investigate among patients with cardiovascular risk profile estimated according to the Framingham Heart Prediction Risk Study, the percentage of those exposed to statins, and the proportion of patients reaching total cholesterol (TC target levels. A cross-sectional analysis was conducted on a large cohort of patients listed in the administrative databases of the Local Health Unit of Ravenna (total resident population of 356,000. In 2001, every single patient who received a prescription for a statin, and/or with a recorded plasma TC level, and/or with a hospital admission for cardiovascular reasons (identified by ICD-9 code, and/or with a clinical appraisal based on the presence of cardiovascular risk factors, was defined eligible. Sebsequently, pharmaceutical, and nosocomial databases, were cross-linked with that of 50 general practitioners in order to assess the pharmacoutilization of statins on a patient-by-patient basis. A cohort of 9,208 patients with a well documented cardiovascular risk profile were analyzed. The mean age of those patients was 57 (SD=17 years and 42% of them was male. On the basis of raised TC levels and cardiovascular risk profiles, patients for whom a statin treatment was suggested amounted to 7,233. However, the number of those who received statins was significantly lower (n = 1,343, corresponding to 18.6%. In those exposed to statins, just a small group of patients reached a level of TC below 190 mg/dl (n = 271, equivalent to 20.2%. In the group of treated who did not achieve recommended TC target levels, 31.7% (n = 340 of patients was at very high cardiovascular risk. Moreover, among all patients with high plasma TC levels (n=5,890, there was a 45.7% (n = 2,690 who did not received any lipid lowering drug even though they had a high cardiovascular risk profile. Results from large population-based administrative databases suggest a remarkable level of undertreatment among patients with cardiovascular risk factors. Furthermore, many patients did not achieve recommended TC target levels with their statin treatment. Pharmacoutilization of statins in general practice reveals the need of a more careful pursuing of therapeutic goals.

  10. EUSEBIO VARGAS VÉLEZ: PROFESSOR AND RESEARCHER IN THE CLINICA DE VIAS URINARIAS Y UROLOGÍA OF THE UNIVERSIDAD DE CARTAGENA (IN SPANISH

    Directory of Open Access Journals (Sweden)

    Sierra-Merlano Rita Magola

    2014-01-01

    Full Text Available The analysis of the discourses of the professionals constitutes a useful tool in the study of the medico-scientific production in the context of the medical historiography. It is emphasized in Hobsbawm´s words: “for the reconstruction of the environment and the temperament of an epoch” and of its actors, when nobody exists to remember them. A product of historical research is presented, part of the doctoral thesis “The medical professionals in the Universidad de Cartagena. Period 1908-1962. A Model of medical professional: state, centralist, anatomo-clinical and individual”. The medical discourse of Eusebio Vargas Vélez was searched in books of enrollments, tests of subjects, certificates and thesis, in the archives and libraries of the Facultad de Medicina of the Universidad de Cartagena, Colombia, in the publications of the Colombian medico-scientific societies, in hospitals in the city and in the personal archives of professors and graduates. Nine publications, seven scientific texts and five letters to education authorities were found. Five of them are related with urologic clinic. Eusebio Vargas Vélez although was educated under the medical French influence, he appropriated himself of the North American one. He was compromised with the advance of the science and the technology applied to the medicine, especially of the urology. He led the education and expansion of the discipline in the local and national area when the half of the 20th century was approaching. Rev. cienc.biomed. 2014;5(1:161-170 KEYWORDS History of Medicine, Urology; Prostate, Prostatectomy

  11. Schistosomiasis of the central nervous system: clinical and radiologic correlation; Apresentacoes da esquistossomose no sistema nervoso central: correlacao clinica e radiologica

    Energy Technology Data Exchange (ETDEWEB)

    Faria, Andreia Vasconcelos; Cerqueira, Elza Maria Figueiras Pedreira de; Reis, Fabiano; Menezes Neto, Jose Ribeiro; Zanardi, Veronica de Araujo [Universidade Estadual de Campinas, SP (Brazil). Faculdade de Ciencias Medicas. Dept. de Radiologia]. E-mail: andrea.vf@ig.com.br; Pirani, Clodoaldo; Damasceno, Benito Pereira [Universidade Estadual de Campinas, SP (Brazil). Faculdade de Ciencias Medicas. Dept. de Neurologia

    2002-02-01

    We report four cases of patients with schistosomiasis in the central nervous system and describe and correlate the radiologic findings with clinical manifestations. In one patient, cerebral involvement presented as a pseudotumoral lesion confirmed by autopsy. Three other patients had schistosomiasis in the spinal cord characterized by an intramedullary mass and radicular and leptomeningeal enhancement after administration of gadolinium. Our findings show the importance of considering schistosomiasis in the differential diagnosis of intramedullary or cerebral lesions in patients of endemic areas of schistosomiasis. (author)

  12. Valutazione analitica e applicazione clinica di un metodo Real Time PCR per il dosaggio della carica virale di Epstein-Barr virus

    Directory of Open Access Journals (Sweden)

    Maria Teresa Bortolin

    2004-03-01

    Full Text Available We assessed the performance of a Real Time PCR assay to be used for EBV viremia evaluation in clinical specimens. Sensitivity and intra-/interassay reproducibility were evaluated by using DNA serial dilutions from the Namalwa cell line. EBV DNA was analyzed in serum samples from 39 patients (pts with undifferentiated type nasopharyngeal carcinoma (UCNT, from 5 infectious mononucleosis (IM pts and from 18 healthy donors. Results obtained by Real Time PCR were compared with those obtained by quantitative competitive (QC-PCR assay.We thereafter measured the dynamics of EBV DNA load in 5 HIV-seropositive (HIV+ and 9 HIV-seronegative (HIV-, as controls pts with lymphoma, treated with high-dose chemotherapy (HCT followed by autologus stem-cell transplantation (ASCT. We found a sensitivity of 100% at 10 EBV copies. The Spearman correlation for both the intra- and the interassay reproducibility was statistically significant (r=0.99; p20 copies/reaction and >30% for EBV viral loads <20 copies/reaction. No EBV DNA was detected in healthy donors. Higher EBV DNA loads were found by Real Time PCR (range 1173-46328 copies/ml than by QC-PCR (range 450-5000 copies/ml (p<0.05. 54% of UCNT and 100% of IM pts were EBV DNA positive. Two HIV+(40% and 2 HIV-(22% pts with lymphoma had detectable EBV viremia during the follow-up. The Real Time PCR is a suitable technique for high-throughput screening and frequent monitoring of patients at risk for developing EBV-associated diseases.

  13. Picture archiving and communication systems (PACS) in clinical practice. Implantacion de un sistema de archivo y comunicacion de imagen (PACS) en la practica clinica

    Energy Technology Data Exchange (ETDEWEB)

    Carreo Pedemonte, J.C.; Piqueras Pardellans, J.; Lucaya Layret, J.

    1994-01-01

    Picture archiving and communication systems (PACS) were developed as a technological response to the complex management of the growing amount of information generated by the different diagnostic imaging methods. This article documents the process of the progressive implementation, starting in January 1991, of the first complete PACS installed in our country. The system installed in our center is composed of acquisition modules for all the imaging methods (computed radiography, ultrasound, computed tomography, digital fluoroscopy and magnetic resonance), a central processing unit, an automatic optical disk for storage and a network of image viewing and diagnostic stations. The preliminary results obtained with its implementation demonstrate that PACS provide a series of functional advantages, especially at the image storage and display levels. In spite of these conveniences, the present high costs of acquisition and maintenance, together with certain technical problems as a result of its complexity, will signify that its generalized application for all imaging methods will not become a reality at most centers in the near future. (Author)

  14. Radiological protection in the interventional techniques: experience in the Pain Clinic of the CIMEQ; Proteccion radiologica en las tecnicas intervencionistas: experiencia en la Clinica del Dolor del CIMEQ

    Energy Technology Data Exchange (ETDEWEB)

    Guerrero C, M. C.; Benitez N, P. P.; Gonzalez G, Y. [Centro de Investigaciones Medico Quirurgicas, Av. 216 Esq. 11B, Playa Siboney, 6096 La Habana (Cuba); Martinez G, A.; Gonzalez R, N. [Centro de Proteccion e Higiene de las Radiaciones, Carretera de la Cantera, Victoria II, Km. 21.5 Guanabacoa, La Habana (Cuba); Sanchez Z, L. R., E-mail: mayka@infomed.sld.cu [Hospital C. Q. Hermanos Ameijeiras, San Lazaro 701, Centro Habana, La Habana (Cuba)

    2014-08-15

    The Pain Clinic of the CIMEQ offers treatment to patients with different pathologies, using interventional techniques as the radiology like visual guide to reach the target structure and to apply the election technique. The personnel that carry out these procedures are inserted in the program of radiological surveillance of the institution, reason for which a radiological event could be detected where the main physician responsible of the service was implied. In this work the results of an investigation are presented realized with the objective of to know the causes of the event and to determine the necessary measures to avoid that this repeats again. The investigation was oriented to three fundamental aspects: medical exam of the affected worker; evaluation of the operational procedures from the radiological protection view point; and dosimetric measurements simulating the real conditions of work for which were used ionization chamber, radiometer and PMMA mannequin. As a result of the medical exam was detected that the main physician of the service did not use during the execution of all the procedures the extremities dosimetry and that he presented a radio induced erythema in the right hand, reason for which he was separated of the activity with ionizing radiations, until the conclusion of the investigation. With relationship to the evaluation of the operational procedures from the radiological protection view point, was verified that the medical physician not carried out any collimation of the beam and he was located in the positions where the dose rate reached the maximum values, frequently introducing the hands in the direct beam; that which implied an overexposure of the superior extremities and a not optimized exposure for whole body. This result was proven with the realized experimental measurements, which gave dose estimated values in extremities of the order of the deterministic effects. The investigation facilitated to introduce modifications in the operational procedures from the radiological protection view point that allowed optimizing the occupational exposure and to avoid the appearance of deterministic effects on the workers of this practice. Parallel was carried out the completion of the protection individual media and working media that allowed the proper application of the mentioned procedures were substituted. On the other hand, this investigation pointed to that the personnel training in radiological protection matter and the control of the occupational exposure in the interventional techniques are indispensable for the safe performance of the medical practice. (author)

  15. Gestion informatica en la dirección clinica hospitalaria. aplicación a un servicio de urología

    OpenAIRE

    Uria González-Tova, Juan

    2004-01-01

    La evolución y transformación de los sistemas públicos de salud han hecho necesaria una descentralización y una mayor autonomía en la gestión hospitalaria para poder mantener los compromisos de eficacia, eficiencia y calidad en las prestaciones sanitarias.· La autonomía en la gestión ha de llegar al nivel de cada Servicio o Unidad funcional, implicando de mayor manera al profesional sanitario en el análisis de su actividad diaria y los diferentes parámetros que la componen, para una mejora ...

  16. Evolution of sensitivity to fosfomycin in bacteria isolated in 1973, 1974 and 1975 in the Servicio de Microbiologia y Epidemiologia of the 'Clinica Puerta de Hierro', Madrid.

    Science.gov (United States)

    Dámaso, D; Moreno-López, M; Martínez-Beltrán, J

    1977-01-01

    The bacteriostatic activity of fosfomycin was studied in vitro against 1,243 clinical isolations of gram-positive cocci and 4,086 isolations of gram-negative bacilli that were obtained in 1973, 1974 and in the period from January to May of 1975. MIC was determined by the agar diffusion method, quantifying it by means of the standard curve that was worked out with the strain of E. coli NCTC 10,418. A slight increase in resistance was observed in the gram-positive cocci: 64 mug/ml were inhibitory for 63% of the 249 isolations obtained in 1973, 59.1% of the 716 isolations obtained in 1974, and 57.5% of the 278 isolations from 1975. A slight loss of sensitivity was also observed in the gram-negative bacilli: the aforementioned concentration of fosfomycin inhibited 36% of the 742 isolations from 1973, 33.6% of the 2,387 isolations from 1974 and 32.6% of the 957 isolations from 1975. 933 g of this antibiotic were consumed in our hospital in 1973, 4,203 g in 1974 and 957 g in 1975. The consumption rate per patient per year was 0.15, 0.72 and 0.20 g, respectively. In conclusion, although no change was observed in the sensitivity of some bacterial strains to fosfomycin, the overall study indicates a slight decrease in the sensitivity, although it does not apparently have any relationship to the consumption of fosfomycin in our hospital.

  17. Porous bone radio sterilized chips and their clinical application in vertebral arthrodesis; Chips de hueso esponjoso radioesterilizados y su aplicacion clinica en arthrodesis vertebral

    Energy Technology Data Exchange (ETDEWEB)

    Luna Z, D. [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico); Ortega E, J.; Zayas M, L. A. [Instituto de Salud del Estado de Mexico, Centro Medico Lic. Adolfo Lopez Mateos, Av. Nicolas San Juan s/n, Ex-Hacienda La Magdalena, 50170 Toluca, Estado de Mexico (MX); Diaz M, I., E-mail: daniel.luna@inin.gob.mx [Centro Estatal de Trasplantes del Estado de Mexico, Pablo Sidar No. 602, Col. Universidad, 50130 Toluca, Estado de Mexico (MX)

    2011-11-15

    The diseases of the muscle-skeletal tissue are the main cause of physical disability which affects in the entire world to millions of people. The bone is part of the muscle-skeletal tissue and the spine is a group of bones that are located in the dorsal part of the human body. At present the spine lesions are varied as those that people suffer when they have automobile accidents of for fallen, mainly in the major adults, if the spine lesions are not treated appropriately they can have consequences to short or long term. A procedure that has been useful for the spine lesions is the vertebral arthrodesis. The tissue banks are places where is obtained bone of distinct origin for clinical use, the chips of porous bone are obtained in banks of specialized tissues which are sterilized with gamma radiation of cobalt-60, the use of this bone type has been demonstrated that these help in the recovery of patients that suffer spine fracture. In this work the process of procurement of human bone is presented, just as the process of its transformation in chips form and its sterilization method. At the end a case of a young patient is presented who suffers an automobile accident and was treated by the vertebral arthrodesis technique of spine, using chips of porous bone for his recovery. (Author)

  18. Analysis of imaging findings and clinical abnormalities in patients with lymphoma; Analise de achados de imagem e alteracoes clinicas em pacientes com linfoma

    Energy Technology Data Exchange (ETDEWEB)

    Caldas, Flavio Augusto Ataliba; Montomiya, Carolina Tsumori [Faculdade de Medicina de Marilia, SP (Brazil)]. E-mail: flavio_caldas@hotmail.com; Silva, Helena Cristina da [Faculdade de Medicina de Marilia, SP (Brazil). Hospital de Clinicas

    2002-04-01

    Computed tomography is currently the method of choice for the diagnostic and staging of lymphomas. Computed tomography enables accurate measurements of both tumor extent and volume and provides information that can be used to plan an appropriate strategy for the treatment. The purpose of the present article is to describe and analyze the chest and abdomen computed tomography and ultrasound findings in HIV-negative patients with lymphoma. Clinical abnormalities, such as the reason the patient sought medical assistance already showing evidence of lymphocytic disease (not yet diagnosed at this point) and the physical examination abnormalities seen on the first consultation were also studied. This study comprised 30 patients: 40% with non-Hodgkin lymphoma, 46,6% with Hodgkin lymphoma, 10% with Burkitt's lymphoma and 3,3% with lymphoblastic lymphoma. (author)

  19. Laser diagnostic and therapy of dental caries: the clinic point of view; Laser diagnostico e tratamento da carie dental: uma visao clinica

    Energy Technology Data Exchange (ETDEWEB)

    Paiva, Priscila Faria

    2001-07-01

    Dental caries's diagnosis is a major dentistry problem from the clinic point of view. The laser beam on the region of 655 nm induces the fluorescence of the compounds present in the hard tissue, quantifying differences between sound and carious enamel and dentine. Diagnodent (Kavo, Germany), showed to be effective regarding dental caries's diagnosis in the present research sampling. The Er:YAG laser (Kavo Key Laser 2, Germany) performed efficient cavity preparations in caries lesions of I and V class type, using up energies that ranged from 300 mJ to 350 mJ with 4 Hz repetition rate for the enamel; and from 250 mJ to 300 mJ with 4 Hz repetition rate for the dentine, and with 80 mJ with 6 Hz of repetition rate for laser conditioning. In the Er:YAG laser preparations no patient was anesthetized even when there were deeper cavities, and the maximum degree of pain ( which ranged from 0 to 10) was 4. In the control group with conventional high-speed drill two patients were anesthetized and the maximum degree of pain was 7. Restorations performed by conventional method of composite were equally satisfying both in caries groups of I and V class type and in the control group. The laser application in the operative dentistry office as a new method of diagnosis and dental preparations should be a good alternative to the use of the conventional dental drill. Nevertheless, dentistry practice has a lot to improve from technology progress, as well as new researches on laser dentistry are necessary in a long term. New types of lasers will come about and will increasingly improve the dental practice assistance and procedures quality. (author)

  20. Correlação clinica entre a mielopatia cervical e o índice de Torg Correlation between the clinic and the index of cervical myelopathy Torg

    Directory of Open Access Journals (Sweden)

    Agnaldo Rogério Lozorio

    2012-01-01

    Full Text Available OBJETIVO: A mielopatia cervical é uma disfunção da medula espinhal relacionada a degeneração típica do envelhecimento, cuja patologia se relaciona com a isquemia e compressão da medula. Muitos são os problemas clínicos apresentados por portadores de mielopatia, nos casos mais graves este acometimento pode levar a para ou tetraplegia quando não tratado. Devido a patologia primária desta doença ser causada por compressão gerando isquemia medular, julgamos poder existir uma correlação entre o grau de compressão e clínica dos pacientes portadores de mielopatia cervical, porém não encontramos nenhum estudo na literatura que realizou esta correlação, por existir esta dúvida na literatura é que objetivamos em nosso estudo analisar a correlação entre o grau do comprometimento clínico dos pacientes com mielopatia cervical e o índice de Torg. MÉTODOS: Estudo prospectivo, de caráter descritivo, avaliados 46 pacientes, realizado mensuração radiográfica do índice de Torg e análise clínica através da escala de JOA e Nurick. RESULTADOS: Dos 46 pacientes, 100% apresentaram Torg OBJECTIVE: Cervical myelopathy is a spinal cord dysfunction related to degeneration typical of aging. Its primary pathology is related to ischemia and spinal cord compression. Patients with myelopathy present many clinical problems; more severe cases may lead to quadriplegia if not treated in a timely manner. Because the primary pathology of this disease is caused by compression, thus generating spinal cord ischemia, we believed there must be a correlation between the degree of compression and the clinical assessment of patients with cervical myelopathy, but we did not find any study in the literature that made this correlation. Because there is doubt the literature we aimed, in our study, to analyze the correlation between the degree of clinical impairment of patients with cervical myelopathy and the Torg index. METHODS: A prospective, descriptive study, evaluating 46 patients, in which radiographic measurements of the Torg index were performed, with clinical analysis through the Nurick and JOA scale. RESULTS: Of the 46 study patients included in the study, 100% presented a Torg score <0.8. The decrease in Torg values was directly proportional to clinical worsening on the Nurick and JOA scale. CONCLUSIONS: The degree of clinical impairment in patients with cervical myelopathy is directly related to the degree of spinal canal stenosis. Level of Evidence I, Prognostic Studies - Investigating the effect of the characteristics of a patient on the outcome of the disease.

  1. [Congenital toxoplasmosis: clinical manifestation, treatment and follow-up] [Article in Italian] • Il neonato con toxoplasmosi congenita: clinica, terapia e follow-up

    Directory of Open Access Journals (Sweden)

    Lina Bollani

    2014-01-01

    Full Text Available Toxoplamosis is a parasitic zoonosis which occurs worldwide, but is prevalent in Europe, South America and Africa. When infection occurs for the first time during pregnancy, mother to child transmission of the parasite can cause congenital toxoplasmosis. Rate of congenital infection ranges from less than 0.1 to approximately 1 per 1,000 live births. The risk of transmission depends on the gestational age at the time of maternal infection. A diagnosis of congenital toxoplasmosis is usually considered in infants who present: hydrocephalus, chorioretinitis, and intracranial calcifications, but this triade is very rare. Approximately 85% of the infants with congenital toxoplasmosis are clinically normal at birth; however, sequelae of infection may become apparent only months or even years later. Chorioretinitis is the main complication of congenital toxoplasmosis, late onset retinal lesions and relapse can appear many years after birth, but the overall ocular prognosis is satisfactory when infection is identified and treated accordingly. Fortunately, serious neonatal forms and severe neurological impairment have become rare, but prompt treatment of children with convulsions, abnormal muscle tone, hydrocephalus, may improve the prognosis and result in almost normal outcome. For infants who have congenital toxoplasmosis, treatment soon after birth for 1 year with pyrimetamine, sulfadiazine and leukoverin led to remarkable resolution of serious, active disease. A long follow-up is necessary to assess the long-term outcome of children and young adults with congenital toxoplasmosis, that is favourable for the majority of cases. Epidemiological surveillance needs to be improved in order to determine the effectiveness of prevention programs.Articoli Selezionati del “3° Convegno Pediatrico del Medio Campidano” · Guspini · 25 Maggio 2013Guest Editor: Roberto Antonucci

  2. Clinical manifestations in patients with computerized tomography diagnosis of neurocysticercosis; Manifestacoes clinicas de pacientes com diagnostico de neurocisticercose por tomografia computadorizada

    Energy Technology Data Exchange (ETDEWEB)

    Pfuetzenreiter, Marcia Regina [Universidade do Estado de Santa Catarina (UDESC), Florianopolis, SC (Brazil). Dept. de Medicina Veterinaria Preventiva e Tecnologia]. E-mail: a2mrp@cav.udesc.br; Avila-Pires, Fernando Dias de [Santa Catarina Univ., Florianopolis, SC (Brazil). Dept. de Saude Publica

    1999-09-01

    A survey was conducted in the urban area of Lages using patients who had been submitted to a computed tomography of the skull in the period of March-December, 1996, for different reasons. Forty-two patients with a provisional diagnosis of neurocysticercosis, and 57 negatives were personally interviewed by one of the authors (Pfuetzenreiter), using a semi-structured procedure. More individuals with a provisional diagnostic of neurocysticercosis reported clinical manifestations related to this infection than those found negative. this difference is more marked among women, except in relation to convulsions, more frequently reported by men (19.05%) than by women (7.14%). The greater percentage of inactive forms (83.33%0 and a longer history of perceived symptoms among those positives suggest that the condition is not new. (author)

  3. Prevalence of vaginal and rectal colonization by Streptococcus agalactiae in pregnant women with preterm labor in Clinica Maternidad Rafael Calvo for the period August 2011 to January 2012

    Directory of Open Access Journals (Sweden)

    Reyes-Ramos Niradiz

    2013-06-01

    Full Text Available Introduction: to be premature is the main cause of perinatal morbimortality, identifyingto the infections during the pregnancy as cause of preterm labor. It has been describedthat colonization of pregnant women by the bacteria Streptococcus agalactiae entailsunfavorable effects about the maternal and neonatal health.Objective: to determine the frequency of vaginal and rectal colonization by Streptococcusagalactiae and its susceptibility to antibiotics in pregnant women with preterm labor.Methods: with prior informed consent, vaginal and rectal specimens were taken to pregnantwomen with preterm labor who admitted to the Clínica Maternidad Rafael Calvo, Cartagena,Colombia, between August 1st, 2011 and January 31st, 2012. The isolations of S.agalactiae were gotten by means of culture in selective medium CHROMagar™ StrepB. Theconfirmation of the specie was carried out by means of CRP with specific primers. Proofsof antibiotic susceptibility were done with Kirby-Bauer methods. Additionally, a form wasapplied to register socio-demographic data and medical record. As an independent variablewas used the colonization, which was correlated with socio-demographic and obstetric dataand with prenatal results. Telephonic follow-up was done for one month.Results: 93 patients were included in the study. A prevalence of 37.6% for vaginal andrectal colonization by Streptococcus agalactiae was found. 15 (16.1% newborns presentedneonatal sepsis. There were not found statistically significant differences in the perinatalresults between the colonized and not colonized groups. There were found statistically significantdifferences in the gestational age between early preterm and late preterm births.Conclusions: Although the occurrence of neonatal sepsis was associated with being earlypremature, there was not association with the colonization status by Streptococcus agalactiaein the mother. It is required the realization of studies that orientate to establishif antibiotic prophylaxis against this bacteria in the population of pregnant women withearly preterm labor contributes to reduce the rate of early-onset neonatal sepsis. Additionalstudies are needed which allow us to establish if the colonization by Streptococcusagalactiae is a risk factor for neonatal sepsis in late preterm birth. Rev.cienc.biomed.2013;4(1:20-30RESUMENIntroducción: la prematurez es causa principal de morbimortalidad perinatal, señalándosea las infecciones durante el embarazo como causa de parto pretérmino. Se ha descritoque la colonización de gestantes por la bacteria Streptococcus agalactiae conlleva efectosdesfavorables sobre la salud materno-neonatal.Objetivo: determinar la frecuencia de colonización a nivel vaginal y rectal por la especieStreptococcus agalactiae y su susceptibilidad a antibióticos, en gestantes con trabajo departo pretérmino.Metodología: previo consentimiento informado, se tomaron muestras vaginales y rectalesa gestantes con trabajo de parto pretérmino que ingresaron a la Clínica Maternidad RafaelCalvo, Cartagena, Colombia, entre 1 de agosto 2011 y 31 de enero de 2012. Los aislamientosde S. agalactiae se obtuvieron mediante cultivo en medio selectivo CHROMagar™Strep B. La confirmación de la especie se realizó mediante PCR con cebadores específicos.Se realizaron pruebas de susceptibilidad a antibióticos mediante el método Kirby-Bauer.Adicionalmente, se aplicó un formulario para registrar datos sociodemográficos e historialmédico. Se utilizó como variable independiente la colonización, la cual se correlacionó condatos sociodemográficos, obstétricos y resultados perinatales. Se hizo seguimiento telefónicopor un mes.Resultados: se incluyeron en el estudio 93 pacientes, determinándose una prevalenciade colonización vaginal y rectal por Streptococcus agalactiae del 37.6%. Entre los reciénnacidos, 15 (16.1% presentaron sepsis neonatal. No se encontraron diferencias estadísticamentesignificativas entre los grupos de colonizadas y no colonizadas en lo concerniente a los resultados perinatales. Al tomar en cuenta la edad gestacional se identificaron diferenciasestadísticamente significativas entre pretérminos tempranos y pretérminos tardíos.Conclusión: aunque la ocurrencia de sepsis neonatal estuvo asociada a prematuridadtemprana, no se encontró asociación con el estado de colonización por Streptococcus agalactiaeen la madre. Se requiere la realización de estudios dirigidos a establecer si la profilaxisantibiótica contra esta bacteria en la población de embarazadas con trabajo de partopretérmino temprano contribuye a reducir la tasa de sepsis neonatal temprana. Se necesitanestudios adicionales que permitan establecer si la colonización por S. agalactiae esun factor de riesgo para sepsis neonatal en pre-términos tardíos. Rev.cienc.biomed.2013;4(1:20-30

  4. ISO 9001 certification in the clinical dosimetry process in physics medical service; Certificacion ISO9001 en el proceso de dosimetria clinica en un servicio de fisica medica

    Energy Technology Data Exchange (ETDEWEB)

    Font Gomez, J. A.; Andres Redondo, M. M.; Gandia Martinez, A.; Jimenez Albericio, F. J.; Mengual Gil, M. A.

    2013-07-01

    The objective of this work is to simply name a series of procedures that are part of the certification and technical instructions (manuals about how to perform specific tasks) without going into details. (Author)

  5. MonitorNet: studio italiano osservazionale multicentrico per la valutazione del profilo rischio-beneficio dei farmaci biologici nella pratica clinica reumatologica

    Directory of Open Access Journals (Sweden)

    S. Bombardieri

    2011-06-01

    Full Text Available Over the last decade, several new biologic agents have become available for the treatment of patients with rheumatoid arthritis (RA, psoriatic arthritis (PsA, ankylosing spondylitis (AS and psoriasis (Ps. In contrast to conventional disease modifying anti-rheumatic drugs (DMARDs, these biological agents have rapid onset of action and pronounced disease reducing activity when administered as monotherapy or in combination with MTX. Pre-registration randomised clinical trials have compared biological agents against placebo over a limited time span (1-3. Wider use of biologics has resulted in reports of a wide range of adverse events (4, including evidence of reactivation of latent tuberculosis, increased incidence...

  6. Alienacion de la Madre, Psicopatoligia y la Practica Clinica en Mexico. (Alienation of the Mother, Psychopathology, and the Practice Clinic in Mexico).

    Science.gov (United States)

    Diaz-Guerrero, Rogelio; And Others

    1979-01-01

    The study related the role of the maternal figure to the affective behavior of the Mexican. Two hundred adolescents judged the concept of "Insult to the Mother" in relation to other similarly charged affective concepts, e.g., "death", "suicide", "drunkenness", etc. Results showed that "Insult to the Mother" was viewed very negatively. (NQ)

  7. Discussão genetico-clinica sobre a Síndrome de Apert: a propósito de um caso

    Directory of Open Access Journals (Sweden)

    Aguinaldo Gonçalves

    1976-09-01

    Full Text Available Após breve introdução sobre a síndrome de Apert, é relatado um caso clínico, sendo destacada a conduta genético-clínica. A discussão revela como os aspectos genéticos envolvidos orientam o raciocínio clínico.

  8. Ultrasonographic and clinical features of fetal cholelithiasis. Three case reports; La litiasi biliare fetale: Diagnosi ecografica e interpretazione clinica. Descrizione di tre casi

    Energy Technology Data Exchange (ETDEWEB)

    Agnifili, Alessio; Gola, Piersante; Marino, Maria; Verzaro, Roberto; Carducci, Giuseppe; Mancini, Ermanno; Rizzo, Franz Maria [L`Aquila, Univ. (Italy). Scuola di Specializzazione in Chirurgia dell`Apparato Digerente en Endoscopia Digestiva; Carducci, Augusto; Biasini, Giancarlo [L`Aquila, Univ. (Italy). Servizio di Medicina Nucleare

    1997-04-01

    Fetal cholelithiasis was first diagnosed in 1983 and since then there have been only few reports about the presence of gallstones in the fetus. Maternal conditions, fetal or obstetrical predisposing risk factors have been proposed to have a causative role, by the pathogenesis of fetal gallstones remains unknown. Clinical sequelae of fetal gallstones are poorly understood as well as the role of fetal cholelithiasis in predisposing the adult to gallstones. They report on 3 patients whose cholelithiasis was diagnosed by obstetrical ultrasonography. Repeated ultrasound scans were performed in each patient until resolution of the US images. The goal of US was to correctly identify the number, size and US features of the material within the gallbladder. The presence of distal shadowing or comet-tail artifact was assess. Multiple, small echogenic foci without distal shadowing were recognized in the fetal gallbladder in their patients. In the third case echogenic foci disappeared during pregnancy. In all the cases, US showed no biliary tract abnormality, and neither the mothers nor the patients had clinical or laboratory findings consistent with liver or biliary diseases. The authors discuss a diagnostic protocol to detect and follow-up gallstones in the perinatal period by ultrasonography. In their experience, fetal cholelithiasis confirmed to be a self-limiting disease without complications and did not require any form of therapy. However a close follow-up is indicated in these patients until spontaneous resolution is demonstrated by US.

  9. Management units radio physics hospital clinic: New management model; Unidades de gestion clinica de radiofisica hospitalaria, ¿nuevo modelo de gestion?

    Energy Technology Data Exchange (ETDEWEB)

    Iborra Oquendo, M.; Angulo Pain, E.; Castro Ramirez, I.; Quinones Rodriguez, L. A.; Urena Llinares, A.; Richarter Reina, J. M.; Lupiani Castellanos, J.; Ramos Caballero, L. I.

    2011-07-01

    Clinical management in the Andalusian Health Service is a process of organizational design that allows professionals to incorporate the management of resources used in their own clinical practice. In the Clinical Management Units activity develops according to different objectives, among them: encourage the involvement of health professionals in managing the centers, enhance continuity of care between the two levels of care, improve work organization and raise patient satisfaction.

  10. Lo studio FAST: FAringotonsillite STreptococcica in età pediatrica Impatto farmacoeconomico delle Linee Guida dell’American Academy of Pediatrics sulla pratica clinica di 600 pediatri italiani

    Directory of Open Access Journals (Sweden)

    G. L. Colombo

    2002-06-01

    Full Text Available The American Academy of Pediatrics (AAP has recently published its new guidelines for the treatment of pediatric tonsillopharyngitis; a diagnostic test for the detection of streptococci is recommended, followed by a treatment with penicillins (10 days or cephalosporins (5 days in case of positivity, and by no treatment otherwise. The success of a guideline, in general, depends on its diffusion in practice and on its adaptability to different local settings. The aim of the present study (FAST was the evaluation of the clinical and economical impact of the application of the AAP guidelines in the Italian reality. The study was conducted with the cooperation of 600 pediatricians, uniformly distributed on the Italian territory, and involved 3072 patients. The pediatricians were left free to decide whether to follow the guidelines or not. The results of the analysis indicate that only some 20% of the pediatricians adhered to the suggested protocol; the total cost (calculated in the perspective of the National Health System, with a time horizon of about 3 months per patient, nonetheless, resulted inferior in the group treated according to the proposed protocol (50,45 • vs. 53,30 •. Furthermore, a lower incidence of complications occurred in these patients. Among the “off-protocol” behaviors, two showed particularly evident misuse of health resources: inappropriate treatment after test positivity (59,15 •/patient, and treatment after test negativity (14% of the total population. Another interesting, although not surprising, result of this study was the evidence that penicillins are as effective as cephalosporins in the short-term, but significantly inferior in terms of complications, positivity for streptococci at the control test, and complications detected at follow-up.

  11. Breast cancer only detected at US. Incidental finding or clinical evidence?; Le neoplasie mammarie visualizzabili solo con esame ecografico. Reperti incidentali o realta' clinica?

    Energy Technology Data Exchange (ETDEWEB)

    Nori, J.; Masi, A.; Boeri, C.; Vivian, A.; Nori Bufalini, F. [Azienda Ospedaliera Careggi, Florence (Italy). Unita' Operativa di Radiodiagnostica 2; Cariti, G. [Florence Univ., Florence (Italy). Dipt. di Ginecologia e Ostetricia

    2000-06-01

    Mammography is the only technique of proven efficacy in the early diagnosis of breast cancer, even though its sensitivity is much lower in breasts that are dense or with a high parenchymal-stroma component. In the past malignant breast nodules detected at US in patients with negative mammographic and physical findings were considered incidental findings, but more recent papers report increasing numbers of breast cancers detected only at US. It was investigated the yield of US performed as a diagnostic complement in asymptomatic women with mammographic findings that were either negative or poorly readable because of dense breast. 13 women were examined: 37 to 55 years old (mean 47): 9 of them were asymptomatic and 4 had poorly specific physical findings. The patients underwent physical examination, mammography, US, micro histologic biopsy with 14G needles under US guidance and surgery. Fourteen breast lesions 7.0-15 mm in diameter were detected only by US. Mammography (2 or 3 standard views) was negative in all cases. The lesions detected only by US (10% of all carcinomas) were typified with US-guided needle biopsy and finally confirmed surgically. Though obtained in a small series, the results seem to suggest that US should be included in the diagnostic work-up, especially of women with dense breast. Also, any hypoechoic lesion detected at breast US in clinically asymptomatic women with negative mammographic findings should be further investigated with US, needle aspiration or core biopsy to make the final diagnosis. [Italian] Si intende con questo lavoro valutare l'utilita' dell'esame ecografico, eseguito come completamento diagnostico in donne clinicamente negative e con mammografia negativa o comunque scarsamente leggibile in relazione alla elevata densita' del parenchima mammario (mammelle dense). Tredici donne con eta' compresa tra 37 e 55 anni (eta' media 47 anni) asintomatiche o con quadri clinici vaghi o comunque non orientativi per patologia neoplastica della mammella hanno eseguito esame clinico, mammografia, ecografia mammaria, prelievo microistologico ecoguidato e intervento operatorio. Quattordici neoplasie mammarie, con dimensioni comprese tra 7 e 15 mm sono state evidenziate solo ecograficamente. La mammografia eseguita nelle 2 o 3 incidenze abituali, e' risultata sempre negativa. Le lesioni neoplastiche evidenziate solamente con l'esame ecografico (10% di tutti i carcinomi) sono state caratterizzate con biopsia istologica con ago da 14G e definitivamente confermate con intervento chirurgico. I risultati ottenuti permettono di suggerire che l'esame ecografico debba essere metodica da includere nell'iter diagnostico nelle donne con mammelle scarsamente leggibili. Le lesioni nodulari ipoecogene sospette rilevate all'esame ecografico in una donna con visita e mammografia negative meritano di essere ulteriormente approfondite (controllo con ecografia, agoaspirazione per citologia o biopsia istologica con ago) al fine di ottenere la definitiva caratterizzazione.

  12. The role of the medical physic on radiologic, hemodynamic and surgery unit at Hospital das Clinicas de Porto Alegre, Rio Grande do Sul State, Brazil; Atuacao do fisico medico nos servicos de radiologia, hemodinamica e unidade de bloco cirurgico no Hospital de Clinicas de Porto Alegre

    Energy Technology Data Exchange (ETDEWEB)

    Bacelar, A.; Furtado, A.P.A.; Krebs, E.M.; Oliveira, S.S.; Lima, A.A.; Jacques, L.C.; Silveira, C.S. [Hospital das Clinicas, Porto Alegre, RS (Brazil). Grupo de Pesquisa e Pos-graduacao em Fisica Medica

    1996-12-31

    The activities executed by the medical physic in the radiologic, hemodynamic and surgery unit are presented. Topics such as organization of a radiologic protection project and a quality assurance program, monthly information of the individual doses, sanitary inspection and training of the professionals involved are emphasized. The methodology and results are briefly presented 2 refs.

  13. Use of semiconductor detector c-Si microstrip type in obtaining the digital radiographic imaging of phantoms and biological samples of mammary glands; Empleo de detector semiconductor de c-Si del tipo microbandas en la obtencion de imagenes radiograficas digitales de maniquies y muestras biologicas de mamas

    Energy Technology Data Exchange (ETDEWEB)

    Leyva, A.; Cabal, A.; Pinera, I.; Abreu, Y.; Cruz, C. M. [Centro de Estudios Avanzados y Desarrollo Nuclear, C. Habana, Cuba (Cuba); Montano, L. M.; Diaz, C. C.; Fontaine, M. [IPN, Centro de Investigaciones y Estudios Avanzados, Mexico D. F. (Mexico); Ortiz, C. M. [ISSSTE, Hospital General Tacuba, Clinica de Mama y Gineco-oncologia, Mexico D. F. (Mexico); Padilla, F. [Instituto Superior de Tecnologias y Ciencias Aplicadas, C. Habana, Cuba (Cuba); De la Mora, R. [Centro de Control Estatal de Equipos Medicos, C. Habana, Cuba (Cuba)], e-mail: aleyva@ceaden.edu.cu

    2009-07-01

    The present work synthesizes the experimental results obtained in the characterization of 64 micro strips crystalline silicon detector designed for experiments in high energies physics, with the objective of studying its possible application in advanced medical radiography, specifically in digital mammography and angiography. The research includes the acquisition of two-dimensional radiography of a mammography phantom using the scanning method, and its comparison with similar images simulated mathematically for different X rays sources. The paper also shows the experimental radiography of two biological samples taken from biopsies of mammas, where it is possible to identify the presence of possible pathological lesions. The results reached in this work point positively toward the effective possibility of satisfactorily introducing those advanced detectors in medical digital imaging applications. (Author)

  14. Image quality control of mammography equipment -Mammography System MX-300- of the Teachers Hospital of UNSA and dose measurement in breasts with radiographic films; Control de calidad de imagen del equipo de mamografia -Mammography System MX-300- del Hospital de Docentes de la UNSA y medicion de dosis en mamas con peliculas radiograficas

    Energy Technology Data Exchange (ETDEWEB)

    Quispe F, L. K.; Vega R, J., E-mail: karinaqflores839@gmail.com [Universidad Nacional de San Agustin, Escuela Profesional de Fisica, Arequipa (Peru)

    2015-10-15

    This work is part of medical imaging for the evaluation of quality. Will have an accredited breast phantom Rmi-156 that allows evaluating the image quality of mammography equipment and through a series of techniques and processes that will submit to mammography films we obtain characteristic curves, which allows to evaluate different parameters that will serve for our study. Images were acquired with different k Vp and m As of the equipment, also with different thicknesses of the breast phantom. Also we want to use the lowest possible dose for obtaining our images. In this paper we develop a simple protocol that aims to unify the conditions under which are acquired the images for later evaluation. By obtaining these characteristic curves demonstrate that the Kodak film is the most suitable for our study because it requires lower dose for obtaining our images. (Author)

  15. Flow characteristics in stepped spillways with 1V: 0,75H slope; Caracterizacao do escoamento sobre vertedouros em degraus de declividade 1V: 0,75H

    Energy Technology Data Exchange (ETDEWEB)

    Sanagiotto, Daniela Guzzon; Marques, Marcelo Giulian [Universidade Federal de Santa Maria (UFSM), RS (Brazil). Dept. de Engenharia Sanitaria e Ambiental. Centro de Tecnologia], E-mail: dsanagiotto@gmail.com

    2011-07-15

    Stepped spillways are structures characterized by the significant resistance imposed to the flow and by the increase in the energy dissipation associated with the friction inserted by the steps. Stepped chutes conduct to economical designs of downstream protection structures in comparison to the ones required in conventional chute spillways (smooth chute). In this work measurements were carried out in physical models of spillways with 1V: 0.75H (53,13 deg) slope and steps height of (1) 0.03 m; (2) 0.06 m and (3) 0.09 m and in a smooth chute with the same slope. The models were installed in a channel with 0.40 m wide and 2.44 m height, evaluating specific discharges between 0.027 and 0.700 m{sup 3}/s/m, that, for a 1:10 scale, corresponds to discharges between 0.8 and 22.1 m{sup 3}/s/m in prototype. According to the results, a methodology was defined for the evaluation of the inception point of air entrainment, the friction factor and the energy dissipation along the flume. (author)

  16. Dosimetric properties characterization of silicon diodes used in photon beam radiotherapy; Caracterizacao das propriedades dosimetricas de diodos de silicio empregados em radioterapia com fotons

    Energy Technology Data Exchange (ETDEWEB)

    Bizetto, Cesar Augusto

    2013-07-01

    In the current work it was studied the performance of epitaxial (EPI) and float zone (FZ) silicon diodes as on-line dosimeters for megavoltage (EPI diode) and orthovoltage (EPI and FZ diode) photon beam radiotherapy. In order to be used as dosimeters the diodes were enclosed in black polymethylmethacrylate (PMMA) probes. The devices were then connected, on photovoltaic mode, to an electrometer KeithleyÒ 6517B to allow measurements of the photocurrent. The irradiations were performed with 6 and 18 MV photon beams (Siemens PrimusÒ linear accelerator), 6 and 15 MV (Novalis TXÒ) and 10, 25, 30 and 50 kV of a Pantak / Seifert X ray radiation device. During the measurements with the Siemens PrimusÒ the diodes were held between PMMA plates placed at 10.0 cm depth. When using Novalis TXÒ the devices were held between solid water plates placed at 50 cm depth. In both cases the diodes were centered in a radiation field of 10 x 10 cm{sup 2}, with the source-to-surface distance (SSD) kept at 100 cm. In measurements with orthovoltage photon beams the diodes were placed 50.0 cm from the tube in a radiation field of 8 cm diameter. The dose-rate dependency was studied for 6 and 15 MV (varying the dose-rate from 100 to 600 monitor units per minute) and for the 50 kV beam by varying the current tube from 2 to 20 mA. All devices showed linear response with dose rate and, within uncertainties the charge collected is independent of dose rate. The current signals induced showed good instantaneous repeatability of the diodes, characterized by coefficients of variation of current (CV) smaller than 1.14% (megavoltage beams) and 0.15% for orthovoltage beams and coefficients of variation of charge (CV) smaller than 1.84% (megavoltage beams) and 1.67% (orthovoltage beams). The dose response curves were quite linear with linear correlation coefficients better than 0.9999 for all diodes. (author)

  17. Dosimetric properties characterization of silicon diodes used in photon beam radiotherapy; Caracterizacao das propriedades dosimetricas de diodos de silicio empregados em radioterapia com feixe de fotons

    Energy Technology Data Exchange (ETDEWEB)

    Bizetto, Cesar Augusto

    2013-07-01

    In the current work it was studied the performance of epitaxial (EPI) and float zone (FZ) silicon diodes as on-line dosimeters for megavoltage (EPI diode) and orthovoltage (EPI and FZ diode) photon beam radiotherapy. In order to be used as dosimeters the diodes were enclosed in black polymethylmethacrylate (PMMA) probes. The devices were then connected, on photovoltaic mode, to an electrometer Keithley Registered-Sign 6517B to allow measurements of the photocurrent. The irradiations were performed with 6 and 18 MV photon beams (Siemens Primus Registered-Sign linear accelerator), 6 and 15 MV (Novalis TX Registered-Sign ) and 10, 25, 30 and 50 kV of a Pantak / Seifert X ray radiation device. During the measurements with the Siemens Primus the diodes were held between PMMA plates placed at 10.0 cm depth. When using Novalis TX Registered-Sign the devices were held between solid water plates placed at 50 cm depth. In both cases the diodes were centered in a radiation field of 10 x 10 cm{sup 2}, with the source-to-surface distance (SSD) kept at 100 cm. In measurements with orthovoltage photon beams the diodes were placed 50.0 cm from the tube in a radiation field of 8 cm diameter. The dose-rate dependency was studied for 6 and 15 MV (varying the dose-rate from 100 to 600 monitor units per minute) and for the 50 kV beam by varying the current tube from 2 to 20 mA. All devices showed linear response with dose rate and, within uncertainties the charge collected is independent of dose rate. The current signals induced showed good instantaneous repeatability of the diodes, characterized by coefficients of variation of current (CV) smaller than 1.14% (megavoltage beams) and 0.15% for orthovoltage beams and coefficients of variation of charge (CV) smaller than 1.84% (megavoltage beams) and 1.67% (orthovoltage beams). The dose response curves were quite linear with linear correlation coefficients better than 0.9999 for all diodes. (author)

  18. Physicochemical characterization of ceramics from Sao Paulo II archaeological site; Caracterizacao fisico-quimica da ceramica do sitio arqueologico Sao Paulo II

    Energy Technology Data Exchange (ETDEWEB)

    Ribeiro, Rogerio Baria

    2013-08-01

    Archaeometry is a consolidated field with a wide application of nuclear analytical techniques for the characterization, protection, and restoration of archaeological pieces. This project aimed at studying the elementary chemical composition of 70 ceramic fragments samples from Sao Paulo II archaeological site, located along the Solimoes River channel, next to Coari city, in Brazilian Amazon. The characterization of samples was performed by neutron activation analysis (NAA). By the determination of 24 elements in the ceramic fragments ( Ce, Co, Cr, Cs, Eu, Fe, Hf, K, La, Lu, Na, Nd, Sb, Sm. Rb, Se, Ta, Tb, Th, U, Yb and Zn), it was possible to define groups of samples regarding the similarity/dissimilarity in elementary chemical composition. For such a task, the multivariate statistical methods employed were cluster analysis (C A), principal component analysis (PCA) and discriminant analysis (DA). Afterwards, seven ceramic fragments were selected based on the groups previously established, for the characterization of the site temporal horizon. Those ceramic fragments were analyzed by thermoluminescence (TL) and EPR for dating purposes. The firing temperatures were determined by electron paramagnetic resonance (EPR) technique, in order to infer about some aspects of the ceramic manufacture employed by the ancient peoples that lived in Sao Paulo 11. By the results obtained in this study, it was possible to identify the quantity of clay sources employed by the ceramists and the age of the ceramic pieces. Therefore, the results of this research may contribute to the study on the occupation dynamics in the pre-colonial Brazilian Amazon. (author)

  19. Synthesis and characterization of polypropylene/graphite nano composite preparation for in situ polymerization; Sintese e caracterizacao de nanocompositos polipropileno/grafite obtidos pela polimerizacao in situ

    Energy Technology Data Exchange (ETDEWEB)

    Montagna, L.S.; Fim, F. de C.; Galland, G.B. [Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS (Brazil). Inst. de Quimica; Basso, N.R.S., E-mail: nrbass@pucrs.b [Pontificia Universidade Catolica do Rio Grande do Sul (PUC-RS), Porto Alegre, RS (Brazil)

    2010-07-01

    This paper presents the synthesis of polypropylene/graphite nanocomposites through in situ polymerization, using the metallocene catalyst C{sub 20}H{sub 16}Cl{sub 2}Zr (dichloro(rac-ethylenebis(indenyl))zircon(IV)). The graphite nanosheets in nano dimensions were added to the polymer matrix in percentages of 0.6;1.0;4.2;4.8 and 6.0% (w/w). The TEM images indicated that the thickness of graphite nanosheets ranged from 4 to 60 nm and by means of XRD analysis it was observed that the physical and chemical treatment did not destroyed the graphite layers. The presence of nanosheets did not decrease the catalytic activity of the nanocomposites. TEM images and XRD analysis of nanocomposites showed a good dispersion of the graphite nanosheets in the polypropylene matrix. (author)

  20. Synthesis and characterization of nanocomposite powders of calcium phosphate/silica-gel; Sintese e caracterizacao de pos nanoestruturados de fosfato de calcio/silica-gel

    Energy Technology Data Exchange (ETDEWEB)

    Muller, D.T.; Delima, S.A. [Universidade do Estado de Santa Catarina (UDESC), Joinville, SC (Brazil). Dept. de Engenharia Mecanica; Santos, R.B.M.; Camargo, N.H.A., E-mail: dem2nhac@joinville.udesc.b [Universidade do Estado de Santa Catarina (UDESC), Joinville, SC (Brazil). Programa de Pos Graduacao em Ciencia e Engenharia de Materiais

    2009-07-01

    In the recent years ceramics of calcium phosphate are pointed out as an outstanding material in substitution and regeneration in defects from osseous tissue, in reason of their similar mineralogical characteristics of apatite of bone structure. However, the challenge with phosphate calcium ceramics find out about the mechanical properties and the development of biomaterials similar of the bone structure, what sometimes is not so easy, about fragile materials. The aim of this work focused in synthesis and characterization nanocomposites powders of calcium phosphate/silica-gel with percentages 1, 2, 3 e 5% of nanometric silica. The method synthesis used for the compositions elaboration was dissolution-precipitation. The presented results are related with the optimization to method elaboration of nanostructured powders, the mineralogical characterization with X-ray diffraction, thermal behavior with thermal differential analysis, differential scanning calorimetry here is ADT and dilatometer. The scanning electronic microscopy was used to help of morphological characterization the nanostructured powders and the surfaces from body test recovered from the mechanical test. (author)

  1. Morphologic characterization and quantitative analysis on in vitro bacteria by nuclear techniques of measurement; Caracterizacao morfologica e analise quantitativa de bacterias in vitro por tecnicas nucleares de medidas

    Energy Technology Data Exchange (ETDEWEB)

    Lopes, Joana D' Arc Ramos

    2001-10-01

    The great difficulty to identify microorganisms (bacteria) from infectious processes is related to the necessary time to obtain a reliable result, about 72 hours. The purpose of this work is to establish a faster method to characterize bacterial morphologies through the use of neutron radiography, which can take about 5 hours. The samples containing the microorganisms, bacteria with different morphologies, after the appropriate microbiologic procedures were incubated with B{sup 10} for 30 minutes and soon after deposited in a plate of a solid detector of nuclear tracks (SSNTD), denominated CR-39. To obtain the images relative to bacteria, the detector was submitted to the flow of thermal neutrons of the order of 2.2 x 10{sup 5} n/cm{sup 2}.s from the J-9 channel of the Reactor Argonauta (IEN/CNEN). To observe the images from bacteria in each sample under an optical microscope, the sheets were chemically developed. The analysis of the images revealed morphologic differences among the genera (Gram positive from Gram-negative and coccus from bacillus), in samples containing either isolated or mixed bacteria. We thus verified the viability of the technique to achieve morphological characterization of different microorganisms. A quantitative approach seemed also to be feasible with the technique. The whole process took about 2 hours. (author)

  2. Superficial characterization of titanium league when submitted to abrasive blasting; Caracterizacao superficial de titanio liga ao ser submetido a tratamento de jateamento

    Energy Technology Data Exchange (ETDEWEB)

    Suzuki, L.Y.; Leite, I.V.; Szesz, E.M.; Siqueira, C.J.M., E-mail: lsuzuki@neoortho.com.b [Universidade Federal do Parana (UFPR), Curitiba, PR (Brazil)

    2010-07-01

    Commercially pure titanium and some of its alloys exhibit a good biocompatibility. These characteristics are frequently used in the manufacture of orthopedic and dental implants. It is possible to modify its surface making it the bioactive using various methods, such as deposition of hydroxyapatite by plasma spray and increasing the roughness of the surface by abrasive blasting. This work is to modify the surface of titanium alloy Ti6Al4V ELI (ASTM F136: 02a) for abrasive blasting and study the morphology, crystallographic phases and the mechanical characteristics of the surface obtained. For such purpose, SEM images, diffraction of X-rays and tests of risk produced by nanoindenter. The sandblasting was done using alumina powder and blasting time of 6s. The morphology of the surfaces of Ti6Al4V ELI changed after sandblasting with increased roughness. It is possible to conclude that after sandblasting the titanium surface do not have a ductile behavior. (author)

  3. Obtaining and characterization of films of stereo complexes PLLA-PDLA; Obtencao e caracterizacao de filmes de estereocomplexos de PLLA-PDLA

    Energy Technology Data Exchange (ETDEWEB)

    Goncalves, R.P.; Dias, M.L.; Picciani, P.H.S., E-mail: raquelpires@ima.ufrj.b [Universidade Federal do Rio de Janeiro (IMA/UFRJ), RJ (Brazil). Inst. de Macromoleculas Professora Eloisa Mano

    2010-07-01

    Polilactides stereorregulars as poly (L-lactide) (PLLA) has wide application in biomedical and packaging, but despite the structure regular, have relatively low crystallization rate, which limits some applications. The formation of stereocomplexes the mixture of PLLA with poly (D-lactide) (PDLA) has been a strategy used to modify the crystalline structure of these materials, which has an important role in controlling its degradation. In this work we prepared films of PLLA and PDLA alone and their mixtures, aiming to produce stereocomplexes. The PLLA and PDLA were synthesized using different catalysts: tin octoate and calcium methoxide, to investigate the effect of microstructure of polymers in the formation of stereocomplex. The films were obtained by pressing at different temperatures. The materials were characterized by X-ray diffraction and GPC. The results indicate that stereocomplexes with different characteristics are obtained when synthesized with two types of catalysts. (author)

  4. Synthesis and characterization of Aluminium and Lanthanum hydro-complexes by multinuclear NMR; Sintese e caracterizacao de hidroxocomplexos de AI e La por RMN multinuclear

    Energy Technology Data Exchange (ETDEWEB)

    Leite, Sidnei Quezada M.; Dieguez, Lidia C. [Universidade Federal, Rio de Janeiro, RJ (Brazil). Coordenacao dos Programas de Pos-graduacao de Engenharia; San Gil, Rosane A.S. [Universidade Federal, Rio de Janeiro, RJ (Brazil). Inst. de Quimica

    1997-12-31

    Evidence suggest that the presence of Lanthanum ions in aluminium chloride solutions during base addition cause the formation of complexes which can promote the formation of an unknown macro-cation. These compounds when mixed to smectites are supposed to yield materials of high thermal stability. In order to contribute to the study of this phenomenon, aqueous solutions of aluminium and lanthanum were analysed by nuclear magnetic resonance. The methodology is presented. Results are presented 5 refs., 2 figs., 2 tabs.

  5. Obtention and characterization of chitin and chitosan from M. rosenbergii; Obtencao e caracterizacao de quitina e quitosana a partr de M. rosenbergii

    Energy Technology Data Exchange (ETDEWEB)

    Battisti, Marcos V.; Campana Filho, Sergio P. [Sao Paulo Univ., Sao Carlos, SP (Brazil). Inst. de Quimica]. E-mail: scampana@iqsc.sc.usp.br

    2001-07-01

    Chitin was extracted from previously ground shells of Macrobrachium rosenbergii by applying acid and alkaline treatments, aiming at its demineralization and deprotenization, respectively. Its characteristics and properties were compared with those exhibited by commercial samples of chitin. Commercial chitosan and samples produced by the deacetylation of chitin obtained from M. rosenbergii shells were also compared. Average degrees of acetylation and intrinsic viscosities of the chitosan were determined by {sup 1}H NMR spectroscopy and by capillary viscosimetry, respectively. The results show that the chitin extracted from Macrobrachium rosenbergii has a lower content of inorganic materials as compared to commercial samples but the chitosan obtained from the former chitin sample is very similar to commercial chitosan. (author)

  6. Synthesis and characterization of gold nanoparticles as diagnostic and therapeutic tool; Sintese e caracterizacao de nanoparticulas de ouro como ferramenta terapeutica e diagnostica

    Energy Technology Data Exchange (ETDEWEB)

    Costa, Pryscila Rodrigues da

    2012-07-01

    Nanomedicine covers the use of nanoparticles to the targeted site of action as platforms for building imaging and therapeutic agents against cancer and other human diseases. In particular, gold nanoparticles (AuNp's) have proven to be efficient for the diagnosis and therapy. Interest in the development of AuNp's is due to their extraordinary physical and chemical properties resulting from the effect of its size in the nanoscale, to have an area of easy modification and the radioactive {gamma} and {beta} emitter ({sup 198}Au; E{gamma} = 0,411 MeV, {beta}{sub max} = 0,96 MeV; T{sub 1/2} = 2,69 days), having the advantage of being able to be applied as a diagnostic tool for molecular photon emission tomography (SPECT) using only a small amount of radioactive gold . In this study were synthesized AuNp's, whose surface is functionalized with a biocompatible polymer (modified polyethylene glycol) and folic acid in order to render them stealth and specific tumors that over express the folate receptors. The techniques of Dynamic Light Scattering (DLS), zeta potential ({zeta}), transmission electron microscopy (TEM) and UV-Visible absorption spectroscopy were employed to characterization of the size and geometry of the nanoparticles, in addition to confirming its binding to thiol -PEG and PEG-thiol Folate. The results of UV-Visible and TEM showed the formation of dispersed AuNp's ranging in size from 8-12 nm with a strong absorption around 520 nm, relating to a maximum of surface plasmon resonance. DLS results showed a hydrodynamic diameter of 10 and 14 nm. The (pH {approx} 5.0 to 6.0) ranged {zeta} potential values of the dispersions prepared between -16.2 and -42.1 mV, indicating stable colloidal suspensions. To determine the real concentration of gold in the samples, it was used neutron activation in the nuclear reactor TRIGA MARK I IPR-R1 CDTN / CNEN of Belo Horizonte. Biocompatibility studies in vitro and in vivo of the samples were carried out showing that they have low toxicity in the models used. We evaluated studies of the internalization of gold nanoparticles functionalized with thiol-PEG-folate-FITC in cells over expressing folate receptors. It was found that the nanoparticles are able to enter the cell, is distributed throughout the cytoplasm and nucleus. According to the results obtained, it can be concluded that it was produced gold nanoparticles dispersed stealth and specific for tumors that overexpression folate. (author)

  7. Modification and characterization of the AISI 410 martensitic stainless steels surface; Modificacao e caracterizacao da superficie do aco inoxidavel martensitico AISI 410

    Energy Technology Data Exchange (ETDEWEB)

    Bincoleto, A.V.L. [Universidade Federal de Sao Carlos (PPG-CEM/UFSCar), SP (Brazil). Programa de Pos-Graduacao em Ciencia e Engenharia de Materiais; Nascente, P.A.P. [Universidade Federal de Sao Carlos (DEMa/UFSCar), SP (Brazil). Dept. de Engenharia de Materiais

    2010-07-01

    Steam turbines are used in the generation of more than half the electric energy produced in the world nowadays. It is important the study which aims to improve the efficiency by means of the optimization of leaks and of the aerodynamic profiles, as well as to maintain the integrity of the components. The martensitic stainless steels are widely employed due to the combination of their good mechanical properties with higher corrosion resistance. However, their lower wear resistance and their poor tribological behavior limit their use, since they decrease the component life time. In order to evaluate the improvement in the performance of the AISI 410 stainless steel, several process of surface modification were employed. Five samples were produced: the first one was not treated, the second one received liquid nitriding, the third, gas nitriding, the forth, thermal aspersion of tungsten carbide, and the fifth, boronizing. The samples were characterized by optical microscopy, surface microhardness, and X-ray diffractometry. (author)

  8. Methodology for the analysis and characterization of the demand side energy resources; Metodologia para analise e caracterizacao dos recursos energeticos do lado da demanda

    Energy Technology Data Exchange (ETDEWEB)

    Baitelo, Ricardo Lacerda; Udaeta, Miguel Edgar Morales [Universidade de Sao Paulo (USP), SP (Brazil). Dept. de Energia e Automacao Eletricas. Grupo de Energia; Burani, Geraldo Francisco; Grimoni, Jose Aquiles Baesso [Universidade de Sao Paulo (USP), SP (Brazil). Inst. de Energia e Eletrotecnica

    2006-07-01

    This abstract aims at describing briefly a model for the assessment of demand side energy resources This model intends to comprehend every kind of action and measure related to demand side management and energy conservation, evaluating them in a holistic way, into four dimensions: technical-economical, environmental, social and political. Different aspects regarding the resources are also accounted, such as energetic potentials (theoretical, accomplishable and economic). At last, scenarios concerning the introduction of evaluated resources through a period of time are elaborated. (author)

  9. Spectroscopic and thermal characterization of bovine enamel and dentine using the photoacoustic effect; Caracterizacao espectroscopica e termica de esmalte e dentina bovinos utilizando o efeito fotoacustico

    Energy Technology Data Exchange (ETDEWEB)

    Stolf, Sandro Fernando

    2003-07-01

    The optical and thermal properties of dental tissues determine the nature and extent of the tissue response through the processes of absorption, transmission, reflection and scattering of the laser light and the heat produced by the absorption of that light. The spectroscopic characterization of bovine dentine and enamel, and the determination of the thermal diffusivity were the aim of this study. The photoacoustic spectra from these tissues were obtained in the Near-Infrared range 900 - 2500 nm, which is the clinical range for odontological application of most lasers. Photoacoustic spectra were taken from block, slices and powder of enamel and dentine. Also photoacoustic spectra were registered before and after 2, 5 and 10 h of topical fluoride (2.26%) application. Using the same technique spectra were taken from dentine and enamel after irradiation with Nd:YAG, Er:YAG, Ho:YLF and CO{sub 2}. It is evident from the results that the presence of O-H in the composition of hydroxyapatite and the water present in the teeth tissue make the obtention of spectrum from components other than O-H bond a very difficult task. In this way, only bands assigned to overtones and combinations of O-H stretch were observed. The thermal diffusivity of the bovine dentine was also measured using the photoacoustic technique. The thermal diffusivity is the physical quantity which measures the rate of heat diffusion throughout the sample. For higher values of the thermal diffusivity the heat diffusion and temperature rise will be faster. As there is many studies devoted to the processes of heat transfer throughout dental tissues using bovine teeth, it is important the determination of its thermal diffusivity. The measured value was found to be a = 2.0 ({+-}0.1).1O{sup -3} cm{sup 2}/s for the both direction, perpendicular and parallel to the dentinal tubules. These {sup a}lues indicate that there is no difference between the thermal diffusivities for the both directions. (author)

  10. Characterization of clays used in the red ceramics industry at Itabaianinha-SE (Brazil); Caracterizacao das argilas utilizadas na industria de ceramica vermelha em Itabaianinha-SE

    Energy Technology Data Exchange (ETDEWEB)

    Azevedo, T.F.; Andrade, C.E.C. de; Santos, C.R. dos; Barreto, L.S., E-mail: thiago_figueiredo91@yahoo.com.br [Nucleo de Ciencia e Engenharia de Materiais, Sao Cristovao, SE (Brazil)

    2011-07-01

    The Local Cluster of red ceramic industry in the state of Sergipe comprises Itabaianinha-SE, Itabaiana and Baixo Sao Francisco municipalities (Propria and Santana do Sao Francisco). The city of Itabaianinha concentrates a large number of ceramics and potteries producing ceramic bricks and tiles. The study was conducted in a red ceramic industry of the region. The focus of this work was an incremental innovation in the process and product. It was analyzed three types of clays used for manufacturing of ceramic bricks (barro preto, diamante and jardim). The samples were prepared by pressing and heat treated between 600 ° C - 1100 C °. The samples characterization was by thermogravimetry, X-ray diffraction and physical tests (water absorption, linear retraction and three points flection). The clays are composed mainly of kaolinite, illite-muscovite and quartz. The results showed that the Barro Preto clay showed better results in retraction, absorption and mechanical strain. (author)

  11. Kinetic characterization and of recrystallization of the aluminum alloy 6063 after S work hardening treatment; Caracterizacao e cinetica de recristalizacao da liga de aluminio 6063 apos tratamentos termomecanicos

    Energy Technology Data Exchange (ETDEWEB)

    Esposito, Iara Maria

    2006-07-01

    The aluminum 6063 alloy possesses a great industrial interest, presenting characteristics that justify its frequent use, when compared to the other aluminum alloys: the precipitation hardening and high cold work capacity. These alloys present high ductility, that allows their use in operations with high deformation degrees, as the cold work. The objective of this work is to show comparative analysis of the hardness Vickers of the commercial aluminum 6063 alloy, after cold work with different area reduction degree and thermal treatment. Considering the frequent utilization aluminium 6063 alloy, this work studies the characterization and recrystallization of this alloy, after the plastic deformation in different area reduction degrees, thermal treatment and convenient treatment times - Thermo mechanic Treatments. (author)

  12. Synthesis and characterization of activated carbon materials for natural gas storage; Sintese e caracterizacao de materiais carbonosos ativados para armazenamento de gas natural

    Energy Technology Data Exchange (ETDEWEB)

    Coutinho, A.R.; Mendez, M.O.; Capobianco, G. [MULTIVACUO Industria e Comercio de Filtros Ltda., Campinas, SP (Brazil); Otani, C.; Petraconi, G.; Maciel, H.; Massi, M.; Urruchi, W. [Centro Tecnico Aeroespacial, Sao Jose dos Campos, SP (Brazil). Inst. Tecnologico de Aeronautica; Campos, F.B. [PETROBRAS S.A., Rio de Janeiro, RJ (Brazil). Centro de Pesquisas (CENPES); Campos, M.F.; Furin, R. [PETROBRAS S.A., Rio de Janeiro, RJ (Brazil)

    2004-07-01

    The activated carbon (AC) materials are characterized by a highly porous structure and high specific surface area, giving the capacity to adsorb molecules in liquid and gaseous phase. The present work has the objectives: project and construction of a pilot plant for production of 30 kg/month of AC; development of hybrid process of AC production using physical and/or chemical activation and cold plasma. The biomass raw materials are used, like pinnus wood and macadamia shell. The samples are prepared in form of grains or briquettes, and inserted in reactor inside of the furnace for the pre-activation process. This process is realized in temperatures of 600 deg C - 900 deg C, with heating rates of 1 deg C.min{sup -1} - 10 deg C.min{sup -1}, using different flow rate of inert gas (200 ml.min{sup -1} - 1000 ml.min{sup -1}); with two kinds of a activating agent: steam and CO{sub 2}. After the withdrawal of the samples of the reactor, the samples are submitted to the final process of activation, in oxidant plasma reactor, varying the following process parameters: pressure, gas flow rate, power and residence time. The chemical activation process consists of adding to the raw material the activating agents, as ZnCl{sub 2}, KOH, and others, in varied ratios. The AC had been characterized by: scanning electronic microscopy (SEM), specific surface area (SSA) by the BET and DR techniques. The preliminary results presents AC produced by the chemical activation with a SSA of 1700 m{sup 2}.g{sup -1} and pore volume of 0,8 cm{sup 3}.g{sup -1}, with average pore diameter of 2,0 nm and burn-off degree of 50%. The AC prepared by plasma process shown values of SSA up to 3200 m{sup 2}.g{sup -1}. (Project supported by Rede Gas Energia - PETROBRAS TC 540.4.049.03-0). (author)

  13. Physical Characterization Of High Amylose/Pectin Mixtures Cross-Linked With Sodium Trimetaphosphate; Caracterizacao fisica de misturas alta amilose/pectina reticuladas com trimetafosfato de sodio

    Energy Technology Data Exchange (ETDEWEB)

    Carbinatto, F.M.; Cury, B.S.F.; Evangelista, R.C., E-mail: curybsf@fcfar.unesp.b [UNESP, Araraquara, SP (Brazil). Fac. de Ciencias Farmaceuticas

    2010-07-01

    Some researches have reported that pectin and high amylose mixtures presented superior mechanical properties in relation to those of the isolated polymers. In this work, mixtures at different ratios (1:4; 1:1) of pectin and high amylose were crosslinked with sodium trimetaphosphate at different degrees by varying reaction conditions. All samples were characterized by rheological and X-ray diffraction analyses. Samples without cross-linker were prepared as control. The oscillatory dynamic tests showed that all samples exhibited predominant elastic behavior, although cross-linked samples presented higher G' values, suggesting that crosslinking by phosphorylation resulted in more strength structures. The diffractograms showed that cross-linked samples underwent structural modifications that resulted in increase of crystallinity due to cross-linking process. (author)

  14. Characterization of the Ni-45wt% Ti shape memory alloy rapidly solidified; Caracterizacao da liga Ni-45wt%Ti com efeito de memoria de forma solidificadas rapidamente

    Energy Technology Data Exchange (ETDEWEB)

    Anselmo, G.C.S.; Castro, W.B. de; Araujo, C.J. de, E-mail: walman@dem.ufcg.edu.b [Universidade Federal de Campina Grande (UAEM/UFCG), PB (Brazil). Unidade Academica de Engenharia Mecanica

    2010-07-01

    One important challenge of microsystems design is the implementation of miniaturized actuation principles efficient at the micro-scale. Shape memory alloys (SMAs) have early on been considered as a potential solution to this problem as these materials offer attractive properties like a high-power to weight ratio, large deformation and the capability to be processed at the micro-scale. shape memory characteristics of Ni-45wt%Ti alloy ribbons prepared by melt spinning were investigated by means of differential scanning calorimetry and X-ray. In these experiments particular attention has been paid to change the velocity of cooling wheel from 30 to 50 m/s. Then the cooling rates of ribbons were controlled. The effect of this cooling rate on martensitic transformation behaviors and structure are discussed. (author)

  15. Structural characterization of aquatic humic substance extracted from Itapanhau and Ribeira de Iguape rivers; Caracterizacao estrutural das substancias humicas aquaticas extraidas dos Rios Itapanhau e Ribeira de Iguape

    Energy Technology Data Exchange (ETDEWEB)

    Goveia, Danielle; Rocha, Julio Cesar [UNESP, Araraquara, SP (Brazil). Inst. de Quimica; Oliveira, Luciana Camargo de [Universidade Federal de Sao Carlos (UFSCar), Sorocaba, SP (Brazil); Morais, Leandro Cardoso de; Campos, Valquiria de; Fraceto, Leonardo Fernandes; Rosa, Andre Henrique [UNESP, Sorocaba, SP (Brazil). Dept. de Engenharia Ambiental

    2011-07-01

    The knowledge of the structure characteristic of the Organic Matter is important for the understanding of the natural process. In this context aquatic humic substances (principal fraction) were isolated from water sample collected from the two distinct rivers, using procedure recommended for International Humic Substances Society and characterized by elemental analysis, electron paramagnetic resonance and nuclear magnetic resonance (1{sup 3C} NMR). The results were interpreted using principal component analysis (PCA) and the statistical analyses showed different in the structural characteristics of the aquatic humic substances studied. (author)

  16. Synthesis of zeolites from boiler fly ash: physical, chemical and mineralogical characterization; Sintese de zeolitas a partir de cinza volante de caldeiras: caracterizacao fisica, quimica e mineralogica

    Energy Technology Data Exchange (ETDEWEB)

    Rocha Junior, C.A.F.; Santos, S.C.A.; Souza, C.A.G., E-mail: augustorocha2@gmail.com [Programa de Pos Graduacao em Engenharia Quimica (PPEQ-UFPA), Belem, PA (Brazil); Angelica, R.S.; Neves, R.F. [Programa de Pos-Graduacao em Geologia e Geoquimica, Instituto de Geociencias (PPGG-IG-UFPA), Ananindeua, PA (Brazil)

    2012-01-15

    Along the years, worldwide industrial development has causing a growing generation of residues, bringing potentials environmental problems. A study of the characteristics of these wastes, as well as the development of techniques for their use in new processes becomes indispensable for the environment preservation. The main purpose of this work is to evaluate the possible use of two important industrial residues from the Amazon region for zeolite synthesis: (a) the fly ash (particle size < 100 {mu}m) that comes from burning of mineral coal in boiler; and (b) the micro silica, a by-product of the reaction between quartz and coal in the production of metallic silicon and alloys iron-silicon.The following chemical, physical and mineralogical characterization methods were carried out: X-ray diffractometry, X-ray fluorescence, scanning electron microscopy, granulometric analysis, differential thermal and thermogravimetric analysis (DTA-TG). The analyses were carried out at the following conditions: 60, 100, 150 and 190 deg C, Na{sub 2}O/Al{sub 2}O{sub 3} molar ratio of 5 and Si/Al molar ratio ranging from 2.12 to 15, and reaction time of 24 h. The results of the fly characterization demonstrate its enormous potential as raw material for the zeolite synthesis. SiO{sub 2} and Al{sub 2}O{sub 3} represent more than 50% of its composition, mineralogical phases defined, low humidity content, low particle size (d{sub 90} < 10 {mu}m), among others. Mineralogical analyses of the synthesized products showed the formation of some zeolite types, as follow: analcime, phillipsite, sodalite, zeolite P and tobermorite. The results show that the mixture fly ash-micro silica in these reaction conditions point to a promising material for zeolite synthesis (author)

  17. Characterization of the main automotive gasoline compounds by using gas chromatography; Caracterizacao dos principais componentes da gasolina automotiva atraves de cromatografia gasosa

    Energy Technology Data Exchange (ETDEWEB)

    Assis, Julio Cesar Rosa; Jaeger, Helena Valli; Almeida, Selmo Queiroz; Teixeira, Leonardo Sena Gomes; Pontes, Luiz Antonio Magalhaes; Vitor Sobrinho, Eledir; Guimaraes, Paulo Roberto Britto; Vianna, Regina Ferreira [Universidade Salvador - UNIFACS, Salvador, BA (Brazil). Dept. de Engenharia e Arquitetura]. E-mail: julio.assis@posgrad.unifacs.br

    2003-07-01

    Gasoline is composed of a number of hydrocarbons of varied structure and different functional groups, which have a marked influence on the final quality of the former. It is thus important to identify the main components of gasoline and how they influence some of its characteristics. This research work is concerned with the development of a technique, based on gas chromatography, for the separation and identification of more than 350 organic compounds likely to be present in gasoline. The study involved 50 gasoline samples collected at gas stations located in Salvador-Bahia (Brazil). The hydrocarbons identified were classified according to their main functional groups and compositions were obtained via a statistical treatment of the raw data. The results have shown that the gasoline used in Salvador has isopentane as the prevalent saturated compound, while m-xylene and methyl-butene are the most frequently found aromatic and olefin, respectively. (author)

  18. Multi-wire detector characterization for daily quality control on IMRT; Caracterizacao de um detector planar de multiplos fios para controle de qualidade diario de tratamentos com IMRT

    Energy Technology Data Exchange (ETDEWEB)

    Ferrari, Vilma A.; Watanabe, Erika Y.; Santos, Gabriela R.; Menegussi, Gisela, E-mail: vilmaferrari@uol.com.br [Instituto do Cancer do Estado de Sao Paulo (ICESP), SP (Brazil). Setor de Radioterapia

    2012-08-15

    Several dosimetry devices are being developed for quality control of radiation treatments using modern techniques as, for example, the Intensity Modulated Radiation Therapy (IMRT). The main function of these devices are to daily quality control of treatments of patients submitted to IMRT technique. The aim of this study is to characterize a type of planar multi-wire detector - DAVID (PTW) - for use in clinical practice. It was evaluated the influence of the system in the radiation beam by measuring the absorption factors and surface dose. We also analyzed the dose-linearity, reproducibility, the dependence with the dose rate and the angle of the linac head. Small errors in the position of the multi-leaf were inserted to evaluate the sensitivity of the system. The results showed that the detector can absorb up to 6.7% of the dose, depending of the energy beam and the field size. A significant increase in surface dose was observed, indicating that individual analysis is necessary for each patient. The system showed good reproducibility, linear response with dose, low dependence with dose rate and low dependence with the angle of the linac head. When small errors were inserted in the position of the multi-leaf, the system was able to detect them. Thus, the detector DAVID proved to be suitable for daily verification of IMRT treatments. (author)

  19. Characterization of a extrapolation chamber in standard X-ray beam, radiodiagnosis level; Caracterizacao de uma camara de extrapolacao em feixes padroes de raios X, nivel radiodiagnostico

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Eric A.B. da; Caldas, Linda V.E., E-mail: ebrito@usp.b [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2011-10-26

    The extrapolation chamber is a ionization chamber used for detection low energy radiation and can be used as an standard instrument for beta radiation beams. This type of ionization chamber have as main characteristic the variation of sensible volume. This paper performs a study of characterization of a PTW commercial extrapolation chamber, in the energy interval of the qualities of conventional radiodiagnostic

  20. Isolation and characterization of soluble sulfated polysaccharide from the red seaweed Glucaric cornea; Isolamento e caracterizacao do polissacarideo sulfatado soluvel extraido da alga vermelha Gracilaria cornea

    Energy Technology Data Exchange (ETDEWEB)

    Melo, Marcia R.S.; Freitas, Ana L.P. [Ceara Univ., Fortaleza, CE (Brazil). Dept. de Bioquimica e Biologia Molecular]. E-mail: rubiamelo@yahoo.com; Feitosa, Judith P.A.; Paula, Regina C.M. de [Ceara Univ., Fortaleza, CE (Brazil). Dept. de Quimica Organica e Inorganica]. E-mail: judith@dqoi.ufc.br

    2001-07-01

    The composition, structure and rheological properties of soluble sulphated polysaccharide Glucaric cornea from Brazilian red seaweeds were investigated. The main components of polysaccharide were 3,6-anhydrogalactose (24.7%) and galactose (64.6%). In addition, minor components as 6-O-methyl-galactose (8.5%), glucose (1.5%), xylose (0.7%) and sulfated groups (4.8%) were detected. Comparison between sulphates content determined by Ft-IR spectroscopy and micro elemental analysis was made. Data from {sup 13}C NMR and FT-IR provided evidence of sulphation in C-4 and C-6 of galactose. No gelation with 1.5, 2.0 and 3.0 % (w/v) aqueous solution was observed, even cooled up to 4 deg C. GPC indicated two majors polysaccharide fractions of M{sub pk} 7.4 x 10{sup 4} and 1.8 x 10{sup 4} g/mol and a minor fraction of M{sub pk} 2.1 x 10{sup 6} g/mol. (author)

  1. Crystallographic characterization of cement pastes hydrated with NaCl; Caracterizacao cristalografica de pastas de cimento hidratadas com NaCl

    Energy Technology Data Exchange (ETDEWEB)

    Melo, Carina Gabriela de Melo e; Martinelli, Antonio Eduardo; Melo, Dulce Maria Araujo; Melo, Marcus Antonio de Freitas; Melo, Vitor Rodrigo de Melo e [Universidade Federal do Rio Grande do Norte (UFRN), Natal, RN (Brazil)

    2012-07-01

    One of the major current challenges faced by oil companies is the exploration of pre salt basins. Salt layers deposited upon the evaporation of ocean water and continental separation are mainly formed by NaCl and isolate immense oil reservoirs. The mechanical stability and zonal isolation of oil wells that run through salt layers must be fulfilled by cement sheaths saturated with NaCl to assure chemical compatibility between cement and salt layer. The present study aimed at evaluating the effect of NaCl addition on the hydration of oil well cement slurries as well as identifying the nature of crystalline phases present in the hardened cement. To that end, cement slurries containing NaCl were mixed, hardened and characterized by X-ray diffraction. The results revealed that the presence of NaCl affects the formation of hydration products by the presence of Friedel's salt. The intensity of the corresponding peaks increase as the contents of NaCl in the slurry increase. High concentrations of NaCl in Portland slurries increase the setting time of cement and the presence of Friedel's salt decreases the strength of the hardened cement. (author)

  2. Characterization of Nafion ionomer and its change due to X radiation; Caracterizacao do ionomero Nafion e sua modificacao por irradiacao de raios X

    Energy Technology Data Exchange (ETDEWEB)

    Almeida, Selma Helena de

    1996-07-01

    In this study, first the characterization of Nafion-117 membranes in the acid form (Nafion-H) and in the salt forms (Na{sup +}, K{sup +}, Rb{sup +} and Cs{sup +}) was performed. In another step, the X-ray effects on membranes (Nafion-H and Nafion-Na) were investigated. The samples were irradiated with X-ray, at 160 kGy/h, with 80-1280 kGy dosages. The characterization of samples (irradiated and unirradiated samples) was performed by X-ray diffractometry, vibrational spectroscopy (photoacoustic in infrared region and Raman scattering), electronic absorption spectroscopy (UV/Vis), electronic paramagnetic resonance spectroscopy (EPR) and thermal analysis (TG and DCS). The studies showed that the membranes submitted to high temperature or to hydration structural changes, as evidence by IR and UV/Vis spectra and DSC curves. This behavior can be assigned to the reorganization of the clusters, resulting in redistribution of the ions and reorientation of the polymers. UV/Vis spectra and DSC curves indicates that the conformational changes induced by temperature and hydration effect continue to occur slowly in the membrane due to relaxation of the polymer. TG analysis indicated that the thermal decomposition mechanism by Nafion-H is different from the mechanism by Nafion-Na. Nafion-H membranes degraded in at least three stages, while Nafion-Na membranes, which showed higher thermal stability than Nafion-H, degraded in only one stage. For irradiation dose higher than 320 kGy, the samples became brittle, which enhanced with increasing doses. This behavior indicates that the predominant effect was the chain scission. The results obtained by different technique showed that the main effects of X-rays on Nafion membranes are the following: decrease in the mechanical properties, peroxy radical production, formation of unsaturated species (C=C and C=O), scissions in the C-O and C-S bonds and SO{sub 2} production. The Nafion-Na membrane showed higher thermal stability and higher resistance to X-ray compared to Nafion-H. UV/Vis and IR spectra of the irradiated samples revealed that additional degradation continues to occur for long time after irradiation process. (author)

  3. For production of ceramic plates coating using waste kaolin, granite and marble; Caracterizacao de residuos de caulim, granito e marmore para uso em massas ceramicas

    Energy Technology Data Exchange (ETDEWEB)

    Sales, J.L.; Morais, C.R.S.; Lima, L.M.R.; Altidis, M.E.D., E-mail: josyanne27@yahoo.com.br [Universidade Federal de Campina Grande (UFCG), PB (Brazil)

    2011-07-01

    The objective is to benefit and characterize waste from kaolin, marble and granite studying their thermal properties and spectroscopic in employment perspective on ceramic production of flooring boards. The residues were benefited through the process of dry grinding mill in greyhounds and passed through sieve 0.074 mm (ABNT No. 200), observing their suitability for the formulation of ceramic pastes. Tests were performed physicochemical characterization (particle size analysis, X-ray fluorescence and X-ray diffraction) and thermal (differential thermal analysis and thermogravimetry). The results showed that these residues showed satisfactory properties for the purpose for which it proposes, and contribute to reducing environmental impacts, allowing the reuse of the production of ceramic plates (author)

  4. Characterization of quartzite waste and their application on red ceramic; Caracterizacao de residuo de quartzitos e sua aplicacao em ceramica vermelha

    Energy Technology Data Exchange (ETDEWEB)

    Babisk, M.P.; Vidal, F.W.H., E-mail: mbabisk@cetem.gov.br [Centro de Tecnologia Mineral (CETEM/MCT), Rio de Janeiro, RJ (Brazil); Vieira, C.M.F.; Ribeiro, W.S. [Universidade Estadual do Norte Fluminense Darcy Ribeiro (UENF), Campos dos Goytacazes, RJ (Brazil)

    2012-07-01

    The incorporation of industrial waste into red ceramic have been used currently in the search for alternative raw materials, and also seeking for an environmentally friendly waste disposal that pollute. During the process of beneficiation of dimension stone, there are significant losses of material and waste generation, which have been placed inappropriately in nature, with no provision for use or reuse. The quartzite is geologically classified as a metamorphic rock composed almost entirely of quartz grains. The aim of this study is to characterize and evaluate the applicability of quartzite waste in the red ceramic. Incorporations were studied up to 40% by weight of waste in the ceramics body and the results indicated that the residue of quartz is a material with great potential to be used as a component in a red ceramic. (author)

  5. Characterization of red ceramic pastes incorporated with sugarcane bagasse ash wastes; Caracterizacao de massa ceramica vermelha incorporada com residuo de cinzas de bagaco de cana-de-acucar

    Energy Technology Data Exchange (ETDEWEB)

    Faria, K.C.P.; Gurgel, R.F.; Holanda, J.N.F., E-mail: katiacpfaria@hotmail.co, E-mail: holanda@uenf.b [Universidade Estadual do Norte Fluminense (LAMAV/UENF), Campos dos Goytacazes, RJ (Brazil). Lab. de Materiais Avancados. Grupo de Materiais Ceramicos

    2010-07-01

    The alcohol industry is one sector that stands out most in the Brazilian agribusiness. Currently there is an increasing demand for sugar and ethanol for use as fuel. The processes of manufacturing these products generate large amounts of waste, the sugarcane bagasse ash waste one of the most abundant. For its chemical and mineralogical characteristics, this waste has aroused the interest of its reuse in the field of red ceramic. This study analyzes the characteristics of a red ceramic paste incorporated with up to 20 wt.% of waste. The following characteristics were performed: chemical composition, X-ray diffraction, particle size, morphology, and Atterberg limits. The results show that the incorporation of sugarcane bagasse ash waste influences the physical-chemical and mineralogical characteristics of red ceramic paste. (author)

  6. Characterization of the profile of energy consumption in isolated regions of Mozambique; Caracterizacao do perfil de consumo energetico em regioes isoladas de Mocambique

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Afonso Henriques Moreira; Cruz, Ricardo A. Passos da; Magalhaes, Ricardo Nogueira

    2008-07-01

    This article summarizes the characterization of energy demand in isolated regions of Mozambique, the result of a work for government of that country. In essence, the profile does not differ much from Brazilian reality in poor regions, except for tribal characteristics, absent here. The importance of anthropogenic energy and almost no zoogenic energy are still points of major difference between the two realities.

  7. Characterization of an electronic system for Image acquisition portal to open field dosimetry; Caracterizacao de um sistema eletronico de aquisicao de imagem portal para dosimetria em radioterapia

    Energy Technology Data Exchange (ETDEWEB)

    Barbi, Gustavo L.; Oliveira, Harley F.; Bertucci, Edenyse C.; Amaral, Leonardo L.; Borges, Leandro F., E-mail: gustavobarbi@usp.br [Universidade de Sao Paulo (USP), Ribeirao Preto, SP (Brazil). Hospital das Clinicas. Centro de Ciencias das Imagens e Fisica Medica

    2012-08-15

    The objective was to characterize and enable an electronic portal imaging device (EPID) to use like a portal dosimetry device - PDI, in non-transit mode, without interposition of scattering between the beam and EPID for measurement to open fields. The images as well as the DICOM header data are extracted from software ImageJ and the information are used in the basic algorithm for converting pixel to dose. The linearity and reproducibility of response were analyzed, and the maximum deviation found of 2,3% to 800 monitor units (MU) for linearity and -0,9% for reproducibility of signal measured daily. A 512x512 matrix with a resolution of 0,8mm was established to restore the shape of beam from the image. The field size dependence was evaluated, by obtaining the ratio of total scattering of ionization chamber and EPID. Finally, a calibration factor of 28470.88{+-}170.73 pixel/cGy was established for the central area of the image. Comparative analyzes between the PDI, radiochromic film and array of ionization chambers (MatriXX) showed good agreement for fields greater then 5 x 5 cm{sup 2} to reestablishment of form field and dose, however, for fields between 3x3 cm{sup 2} and 5x5 cm{sup 2}, the agreement to shape of beam was best established by film. (author)

  8. Morphological characterization of nanocomposites of membrane PEI/regional clay; Caracterizacao morfologica de membranas de nanocompositos de PEI/argila regional

    Energy Technology Data Exchange (ETDEWEB)

    Medeiros, Vanessa da N.; Leite, Amanda M.D.; Paz, Rene A. da; Araujo, Edcleide M., E-mail: vanismedeiros@gmail.com [Dept. de Engenharia de Materiais, Universidade Federal de Campina Grande - UFCG, Campina Grande, PB (Brazil); Pessan, Luiz A. [Universidade Federal de Sao Carlos - UFSCar, Sao Carlos, SP (Brazil)

    2011-07-01

    The interest in the nanotechnology development in the last decade allows the increase in the nanocomposite area due to the special properties presented by these materials. In the nanocomposite, the nanometric particles are dispersed in the polymer matrix. The membrane separation process, although is recently, is increasing in applications such as purification, fractioning and concentration of substances in several industries. The membranes to gas separation present specific advantages when compared with conventional separation process (such as, cryogenic distillation and adsorption). The aim of this work is to prepare plane membrane by evaporation-precipitation method. These membranes were obtained from polyetherimide (PEI) with bentonite clay from Paraiba/Brazil. The results showed that by XRD, it can be observed there is not practically intercalation of polymer molecules between the layers of clay and was seen by SEM that the membranes have dense structures, ie, favorable for application in gas separation. (author)

  9. Preparation and characterization of organoclays for use in polymer nanocomposites; Preparacao e caracterizacao de argilas bentoniticas organofilicas para a utilizacao em nanocompositos polimericos

    Energy Technology Data Exchange (ETDEWEB)

    Nobrega, K.C. [Universidade Federal de Campina Grande (UEMa/UFCG), PB (Brazil). Unidade Academica de Engenharia de Materiais; Leite, A.M.D.; Souza, D.D. de; Araujo, E.M.; Melo, T.J.A. de [Universidade Federal de Campina Grande (DEMa/UFCG), PB (Brazil). Dept. de Engenharia de Materiais

    2010-07-01

    The aim of this work is to obtain organoclays from a sodium bentonite clay using two organic salts, Cetremide and Dodigen, and characterize them for nanocomposites use. The obtained results by X-ray diffraction (XRD) confirmed the obtaining of organoclay, since the originally submitted sodium bentonite interlayer distance of 12,81 A, and the cation exchange when it made with two different quaternary ammonium salts (Cetremide and Dodigen), the distance expanded to 18,48 A in both treatments, indicating the effective intercalation of the organic cation. By means of infrared spectroscopy (FTIR), it was observed the appearance of adsorption bands related to the CH{sub 2} and CH{sub 3} groups, confirming the presence of chains of organic salts from the clay, no significant structural differences between the clays treated with different salts. (author)

  10. Application of the semantic import approach for characterization of geological contacts; Aplicacao da abordagem da importacao semantica (IS) para caracterizacao de contatos geologicos

    Energy Technology Data Exchange (ETDEWEB)

    Moreira, Fabio Roque da Silva; Almeida Filho, Raimundo de; Camara, Gilberto [Instituto Nacional de Pesquisas Espaciais (INPE), Sao Jose dos Campos, SP (Brazil)]. E-mails: fmoreira@ltid.inpe.br; rai@ltid.inpe.br; gilberto@dpi.inpe.br

    2001-07-01

    This work describes the use of semantic import approach (SI) as a way to characterize the sort of geological boundaries in GIS projects. The technique applies fuzzy sets to represent the nature of the lithological boundary (defined and inferred) in a spatial inference modelling study for mapping potential areas for radioactive mineral prospecting in the Pocos de Caldas alkaline complex. (author)

  11. Characterization of polyurethane/organophilic montmorillonite nanocomposites by low field NMR; Caracterizacao de nanocompositos de poliuretano/montmorilonita organofilica por RMN de baixo campo

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Marcos Anacleto da [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil). Laboratorio de Nanocompositos Polimericos; Tavares, Maria I.B.; Nascimento, Suelen A.M.; Rodrigues, Elton J. da R [Universidade Federal do Rio de Janeiro (NUCAT/PEQ/COPPE/UFRJ), RJ (Brazil). Laboratorio de Nanocompositos Polimericos

    2012-07-01

    Polyurethanes are important and versatile materials, mainly due to some of their properties, such as high resistance to abrasion and tearing, excellent absorption of mechanical shocks and good flexibility and elasticity. However, they have some drawbacks as well, such as low thermal stability and barrier properties. To overcome these disadvantages, various studies have been conducted involving organophilic polyurethane/montmorillonite nanocomposites. The investigation of the structure of polyurethane/clay nanocomposites has mainly been done by X-ray diffraction (XRD) and transmission electron microscopy (TEM). In this work, PU/clay nanocomposite films obtained by solution intercalation were studied. The nanocomposites were characterized by XRD and low-field nuclear magnetic resonance (LF-NMR). The LF-NMR measurements, with determination of the spin-lattice relaxation time of the hydrogen nucleus, supplied important information about the molecular dynamics of these nanocomposites. The X-ray diffraction measurements validated the results found by NMR. The thermal stability of the material was also determined by thermogravimetric analysis (TGA) under an inert atmosphere. A slight improvement in this stability was observed in the nanocomposite in comparison with polyurethane (author)

  12. Preparation and characterization of bentonite clays mixture destined to the removal of heavy metals; Preparacao e caracterizacao da mistura de argilas bentoniticas destinadas a remocao de metais pesados

    Energy Technology Data Exchange (ETDEWEB)

    Almeida Neto, A.F. de; Silva, M.G.C. da, E-mail: ambrosio@feq.unicamp.b [Universidade Estadual de Campinas (UNICAMP), SP (Brazil). Fac. de Engenharia Quimica. Dept. de Termofluidodinamica

    2009-07-01

    In this work a mixture was prepared with 50% wt. of the Bofe and Verde-lodo clays. The characterization methods used they were: thermal analyses (TG and DTG), X-ray diffraction, fisissorption of N{sub 2}, scanning electron microscopy and X-ray energy dispersive spectroscopy. The rehearsals of adsorption we accomplished in system of finite bath using as adsorbent the mixture loamy in natura or it mixes calcined. Starting from TG and DTG a thermal treatment was accomplished to 500 deg C of the loamy mixture. Through the results of the copper adsorption, it was verified that mixes loamy it provokes chemical precipitation of the copper while the calcined sample presents amount metal adsorbed around 7.31 mg of copper/g of adsorbent. The value of removal percentage obtained by the calcined sample it was of 63.02%. (author)

  13. The importance of using diffraction of X ray in clays characterization; A importancia da utilizacao da difracao de raios X na caracterizacao de argilas

    Energy Technology Data Exchange (ETDEWEB)

    Piccoli, R.; Nascimento, G.C.; Vitoretti, P.P.; Wernck, A.S.W., E-mail: rosaura@sc.senai.b [SENAI, Criciuma, SC (Brazil). Centro de Tecnologia em Ceramica; Perdona, C.R. [Universidade Barriga Verde, Cocal do Sul, SC (Brazil). Curso de Engenharia Ceramica; Perucchi, P. [Universidade do Extremo Sul Catarinense, Criciuma, SC (Brazil). Curso de Ciencia e Engenharia de Materiais

    2009-07-01

    The objective of this work is to demonstrate how the identification of crystalline phases and deg of crystallinity by diffractometry technique of X-ray (XRD) combined with chemical analysis of a sample can help in the study and characterization of raw materials, mainly those used in ceramic compositions. This study also aims to address the inherent limitations of this technique in relation to types of crystalline phases present in the sample of interest for analysis. (author)

  14. Characterization of acai seeds as a feedstock for electricity generation via gasification; Caracterizacao do caroco de acai como insumo para geracao de eletricidade via gaseificacao

    Energy Technology Data Exchange (ETDEWEB)

    Seye, Omar; Souza, Rubem Cesar Rodrigues de; Bacellar, Atlas Augusto; Morais, Marcia Rodrigues de [Universidade Federal do Amazonas (CDEAM/UFAM), Manaus, AM (Brazil). Fac. de Tecnologia. Centro de Desenvolvimento Energetico Amazonico], emails: omar_seye@hotmail.com, rubem_souza@yahoo.com.br, abacellar@ufam.edu.br, marcia_morais2004@yahoo.com.br

    2008-07-01

    This work presents an overview of the characterization physical-chemistry and energy of the aca pit used as input in process of generation of electricity through gasification. Acai pits analyses were accomplished with relationship to the acai pit drying, energy content, proximate and ultimate analyses, size, TGA experiments, bulk density. It was observed that the acai pit can be used as bioenergy but, it presents a low energy content (16,36 MJ/kg) in relationship that of the ' typical' biomass (21 MJ/kg ) and this is not due to the ash content that is very low (1,15%), but yes, the only composition that resembles each other more the Carbohydrates than to the typical composition of the usual biomass. The average diameter of 10 pits chosen at random was 9.5 mm. The acai pits have an angle of repose of {approx}20 degrees, making them ideal for feeding into gasification and combustion processes. (author)

  15. Characterization of silicates and calcium carbonates applied to high-dose dosimetry; Caracterizacao de silicatos e carbonatos de calcio aplicados a dosimetria de doses altas

    Energy Technology Data Exchange (ETDEWEB)

    Vila, Gustavo Barreto

    2012-07-01

    The predominant isomorphous form in the biominerals studied in this work (oyster shell, coral, mother of pearl and shell) was aragonite. The appearance of the calcite phase occurred at 500 deg C at a heating rate of 10 deg {sup C}/s for all samples except for the coral sample, which was 400 deg C, independent of the heating rate. The most abundant element in the biominerals samples was Ca in the CaO form, and in the silicates (tremolite, diopside and rhodonite) Si in the SiO form. The most common trace element observed in the biominerals samples was Fe. The analyses of electron paramagnetic resonance showed lines of Mn{sup 2+} in the coral and mother-of-pearl samples before irradiation. In the case of the irradiated samples, the defects found were CO{sub 2}{sup -}, CO{sub 3}{sup 3-}, CO{sub 3}{sup -} and SO{sub 2}{sup -}, in the g range between 2.0010 and 2.0062. In the analyses by optical absorption of biominerals, transitions due to the presence of Mn in the samples were found. A thermoluminescent (TL) peak at approximately 140 deg C was found for the biominerals and at 180 deg C for silicates, which intensity depends directly on the dose. For samples exposed to different types of radiation, the TL peak occurred at lower temperatures. From the dose-response curves obtained for these materials, it was possible to determine a linear range for which their application in high dose dosimetry becomes possible. Taking into account the radiation type, among biominerals and silicates, the lowest detectable dose (40mGy) to gamma radiation was achieved for oyster shell samples using the measuring technique of optically stimulated luminescence (OSL). Using beta radiation, for diopside and tremolite samples the lowest detectable dose of 60mGy was obtained. For all samples, using the TL, OSL and thermally stimulated exoelectron emission (TSEE) techniques in alpha, beta and gamma radiation beans a good response reproducibility was obtained. Therefore, the samples characterized in this work are suitable to be used as high dose detectors/dosimeters. (author)

  16. Characterization of polypropylene films modified for using as ion exchange membrane; Caracterizacao de filmes de polipropileno modificados para uso como membrana trocadora de protons

    Energy Technology Data Exchange (ETDEWEB)

    Zen, H.A.; Geraldes, A.N.; Parra, D.F.; Geraldo, A.B.C.; Araujo, S.G.; Lugao, A.B.; Linardi, M. [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2006-07-01

    This paper presents previous results of polypropylene films modified by graft process via ionising radiation. The styrene monomer was used in the graft process in presence of toluene as 100%, 80% and 20% proportions of styrene. The samples were irradiated in a cobalt-60 source at 40 and 80 doses. The TGA, DSC, FTIR characterizations were made and degree of grafting (DOG) was determinate. The results of DOG were confirmed by the FTIR analysis although the most samples were less thermal stable. (author)

  17. Chemical characterization of Xanthan biopolymers synthesized by Xanthomonas campestris pv pruni strains; Caracterizacao quimica de biopolimeros sintetizados por Xanthomonas campestris pv pruni

    Energy Technology Data Exchange (ETDEWEB)

    Moreira, Angelita da S.; Vendruscolo, Claire T.; Furlan, Ligia [Universidade Federal de Pelotas, RS (Brazil). Centro de Biotecnologia]. E-mail: angelita@ufpel.tche.br; claire@ufpel.tche.br; ligia@ufpel.tche.br; Galland, Griselda [Rio Grande do Sul Univ., Porto Alegre, RS (Brazil). Inst. de Qumica

    2001-07-01

    In this work we describe the characterisation of Xanthan biopolymers synthesized by two Xanthomonas campestris pv pruni strains, in aerobic fermentation. By chromatography on TLC we could notice the presence of Mannose monomer in higher proportion in the 82 strain with relation to the another ones. The viscosity results showed the temperature dependence. The 06 and 82 strains had their viscosity increased whereas for the 87 strain we could observe a reduction with temperature increasing. The {sup 13}C NMR spectrum of 87 strain showed the characteristic signals at approximately 92.8, 70.4 and 61.4 ppm, attributed to C1, C4 and C6 from glucose monomer, with higher intensity. (author)

  18. Synthesis and characterization of zeolite material from coal ashes modified by surfactant; Sintese e caracterizacao de material zeolitico de cinzas de carvao modificado por surfactante

    Energy Technology Data Exchange (ETDEWEB)

    Fungaro, D.A., E-mail: dfungaro@ipen.b [Instituto de Pesquisas Energeticas e Nucleares (CQMA/IPEN/CNEN-SP), Sao Paulo, SP (Brazil). Centro de Quimica e Meio Ambiente; Borrely, S.I. [Instituto de Pesquisas Energeticas e Nucleares (CTR/IPEN/CNEN-SP), Sao Paulo, SP (Brazil). Centro de Tecnologia das Radiacoes

    2010-07-01

    Coal ash was used as starting material for zeolite synthesis by means of hydrothermal treatment. The surfactant-modified zeolite (SMZ) was prepared by adsorbing the cationic surfactant hexadecyltrimethylammonium bromide (HDTMA-Br) on the external surface of the zeolite from coal ash. The zeolite structure stability was monitored during the characterization of the materials by FTIR, XDR and SEM. The structural parameters of surfactant-modified zeolite are very close to that of corresponding non-modified zeolite which indicates that the crystalline nature of the zeolite remained intact after required chemical treatment with HDTMA-Br molecules and heating treatment for drying. The most intense peaks in the FTIR spectrum of HDTMA-Br were observed in SMZ spectrum confirming adsorption of surfactant on zeolites. (author)

  19. Synthesis, characterization and electrical properties of solid electrolyte for solid oxide fuel cell; Preparacao, caracterizacao e propriedades eletricas de eletrolito solido para celula a combustivel de oxido solido

    Energy Technology Data Exchange (ETDEWEB)

    Berton, Marco Antonio Coelho; Garcia, Carlos Mario; Matos, Jeferson Hrenechen [Instituto de Tecnologia para o Desenvolvimento (LACTEC), Curitiba, PR (Brazil)], Emails: felsky@latec.org.br, garcia@latec.org.br, jeferson.h@latec.org.br

    2010-04-15

    Solid electrolytes of BaCe{sub 08}Gd{sub O29} were prepared by the polymeric precursor method. X-ray diffraction data shows a single phase with orthorhombic crystalline structure. The densification process was followed by scanning electronic microscopy and apparent density measurements. The apparent density was developed for different temperatures of sintering, reaching > 96% for sintered temperature of 1550 {sup 0}C deg . The electrochemical impedance analysis was development in the temperature of 400-700 deg C, in air atmosphere at 700 deg C a value of 30,6 mS.cm{sup -1} was obtained. The results of conductivity have confirmed the gadolinium doped barium cerate has a great potential for use as solid electrolyte for intermediate temperature solid oxide fuel cell, at experimental controlled conditions. (author)

  20. Structural analysis and magmatism characterization of the Major Gercino shear zone, Santa Catarina State, Brazil; Analise estrutural e caracterizacao do magmatismo da zona de cisalhamento Major Gercino, SC

    Energy Technology Data Exchange (ETDEWEB)

    Passarelli, Claudia Regina

    1996-12-31

    This work describes the geometric and kinematic characteristics of the Major Gercino Shear Zone (MGSZ) in the Canelinha-Garcia area. This shear zone is one of the major lineaments that affect all southern Brazilian precambrian terrains. In Santa Catarina State, it separates, along its whole extension, the supracrustal rocks of the Brusque belt (northern part) from the Granitoid belt (southern). This zone is characterized by a regional NE trend and a dextral sense of movement where ductile-brittle structures predominate. The MGSZ is composed of two mylonitic belts separated by granitoid rocks probably associated to the development of the shear zone. Both shear zones show cataclastic to ultra mylonitic rocks, but mylonites and protomylonites conditions at high strain rate. The calc-alkaline granitoids present in the area can be grouped in two granitoid associations with meta to peraluminous affinities. The Rolador Granitoid Association is characterized by grayish porphyritic biotite-monzogranites and the Fernandes Granitoid Association by coarsed-grained to porphyritic pinkish amphibole-syenogranites. The U-Pb and Rb-Sr ages range from 670 to 590 Ma with the Sr{sup 87} / Sr{sup 86} initial ratios suggesting a crustal contribution in the generation of these rocks. The importance of the pure shear component is also emphasized by the results of the Fry method. Many z axes of the strain ellipses are at high angle to the shear foliation. Symmetric porphyroclasts also corroborate this hypothesis. The micaceous minerals formed during the shear development indicate K-Ar ages around 555 {+-} 15 Ma. Brittle reactivations of the shear zone have been placed by K-Ar in fine-fraction materials at Triassic time (215 {+-} 15 Ma.) 220 refs., 107 figs., 18 tabs., 4 maps

  1. Fishing activity characterization in areas under influence of seismic activity; Caracterizacao da atividade pesqueira em areas sob influencia da atividade sismica

    Energy Technology Data Exchange (ETDEWEB)

    Fuse, Izabel Yukimi; Zanella, Joao Francisco Illa Font; Eliseire Junior, Dirceu; Pereira, Edisio [Hidrosfera Oceanografia e Meio Ambiente, Rio de Janeiro, RJ (Brazil); Souza, Sergio Augusto Coelho de; Ferraz, Alexandre; Costa, Leandro Soares da; Vidal, Leonardo; Duppre, Mauricio [Okeanos Consultoria e Meio Ambiente Ltda. (Brazil); Uller, George [CGG do Brasil, Rio de Janeiro, RJ (Brazil)

    2004-07-01

    Seismic surveys are an important method in prospecting for oil and gas reservoirs in the marine environment. The ELPN/IBAMA has required that companies develop an adequate social programme in parallel with the seismic surveys to establish a better interaction with the communities influenced by these operations and reduce possible negative effects. Between January and October 2003, CGG Brazil studied coastal communities in the following areas. BM-CE-1 e BM -CE-2, Ceara; Fragata, BM-ES-5 e BM-ES-6, Espirito Santo; BM BAR-1 e BM BAR-3, Maranhao and BM-C-25 and BM-C-16 off Campos basin. Communities and groups that could potentially be influenced by the surveys were visited to mitigate direct and indirect impacts. Preliminary results show that fisheries were the main group to be monitored. A standard questionnaire was used to characterize the local fisheries and interviews were held with fishermen, boat owners and members of the fishery industries (n=422). In Ceara the fishery is typically handmade and occurs in water depths up to 200 meters. The main boat propulsion is sail and the 'Cacoeira' is the most popular gear used. Off Espirito Santo, small and medium motored boats are usually used and line is the main gear among the fishermen. At Barreirinhas (Maranhao), boats are usually up to 14 meters long, and operate in water depths of up to 120 metres. Again the 'cacoeira' is the proffered gear. We concluded that Programs carried out by CGG reached their purpose. This is confirmed by low incident rate between seismic ships and the fisheries fleet. (author)

  2. Methodological development and characterization of welded joints in Poly (vinylidene fluoride) (PVDF); Desenvolvimento metodologico e caracterizacao de juntas soldadas de PVDF

    Energy Technology Data Exchange (ETDEWEB)

    Cedrola, S.M.L.; Costa, M.F. da; Pasqualino, I.P., E-mail: samanta@metalmat.ufrj.b [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil)

    2010-07-01

    Pipelines are of great concern in the transport sector of oil and gas industries, mainly due to the natural internal aging process caused by contact with the different transported fluids. Installation of polymeric pipes called liners is a good option for rehabilitation of long segments of deteriorated pipelines. Among the potential materials for such application is Poly (vinylidene fluoride) (PVDF). Meanwhile the installation process cannot be carried out in one single step and the polymeric pipe must be cut in sections that are welded during the installation process. In this research welding methodology was studied aiming to optimize welding conditions and the mechanical properties of the joined materials. The first step was processing the PVDF via compression molding on different conditions. Then, the sample was cut and butt-welded. Welding parameters such as, time control, temperature and contact pressure were studied. Afterwards, the stress-strain properties of the welded material was evaluated and physical characterization was carried by x-ray diffraction (DRX). (author)

  3. Silica-gel structural characterization during the initial phases of gelation and drying; Caracterizacao estrutural de geis de silica durante as etapas iniciais de gelacao e secagem

    Energy Technology Data Exchange (ETDEWEB)

    Ferreira, Max Passos

    1996-12-31

    For centuries, glasses and ceramics have been made via melting or solid state reactions at temperatures above 100 deg C. The sol-gel process offers new approaches to the synthesis of glasses and ceramics, combining control of composition and structure at the molecular level with the ability to shape materials in bulk, powder, fiber and thin-film forms. The growth of sol-gel technology research is due to the many unique features of that class of materials. Major applications include optical elements and integrated optical devices, ceramic filters, membranes, supercondutors, magnetic, catalytic and manostructured materials to antioxidant, anticorrosion coatings and composite and biomedical materials. In this work a variety of techniques like spectroscopy, Raman spectroscopy, ultraviolet-visible spectroscopy, light scattering nuclear magnetic resonance, X ray diffraction and nitrogen adsorption have been employed to investigate the initial phase of the sol-gel transition of gamma ray irradiated tetramethoxysilane (TMOS) solutions and non-irradiated TMOS solution and to get information about the structure of the silica gels obtained under different gelation conditions. Typically the tetramethoxysilane solutions were prepared using a molar ratio of TMOS to demineralized water of 1 to 16. Some experiments were made under catalysed conditions. The mixing was carried out at room temperature. The turbidity and light scattering experiments on the polycondensation of tetramethoxysilane show that exists no drastic difference in the gelling time of a gamma ray irradiated and a non-irradiated TMOS+H{sub 2}O (1+16 M) solution. In the absence of a catalyst, the gelling time for both reactions occurs in about 3.30 h. When HNO{sub 3} (o.03 M) was used, the gelling time observed was 3 days. Raman and ultraviolet-visible spectroscopy show no drastic difference during the initial phase at the sol-gel transition under ambient temperature/pressure and under gamma radiation. The gels heated-treated at 70 deg C appeared to be almost completely amorphous with no evidence of peaks attributable to crystalline materials, with average pore radii usually around 11 A. The surface areas found ranged from {approx} 460 M{sup 2}. G{sup -1} (gelation under magnetic field) to {approx} 770 M{sup 2}. g{sup -1} (polymerization under catalysed condition and gelation under gamma radiation) while the total pore volume ranged from 0.27 cm{sup -3}.g{sup -1} (gelation under magnetic field) to 0.43 cm{sup -3}.g{sup -1} (polymerization under catalysed condition and gelation under gamma radiation). (author) 151 refs., 34 figs., 7 tabs.

  4. Physical-chemical characterization of sediments from Lapa Grande de Taquaracu archaeological site, MG; Caracterizacao fisico-quimica de sedimentos do sitio arqueologico Lapa Grande de Taquaracu, MG

    Energy Technology Data Exchange (ETDEWEB)

    Tudela, Diego Renan Giclioti

    2013-07-01

    In this project the elemental concentrations of Ce, Co, Cr, Cs, Eu, Fe, Hf, K, La, Lu, Na, Nd, Rb, Sc, Sm, Ta, Tb, Th, U, Yb and Zn were determined by instrumental neutron activation analysis (INAA) in 60 sediment samples from Lapa Grande de Taquaracu archaeological site, located in MG State. The samples were provided by Dr. Astolfo Gomes de Mello Araujo from the Museum of Archaeology and Ethnology, University of Sao Paulo. This site is a palaeoindian rockshelter located near Lagoa Santa karst with characteristics which could be used to test karst abandonment model during the Middle Holocene related to dry conditions. The results of elemental concentrations, interpreted by multivariate statistical analysis, showed the formation of three different compositional and well-defined groups. The variable selection study by means of Procrusts analysis was also carried out. X-ray diffraction (XRD) analyses were also performed in 8 samples to study their mineralogical composition and they showed that there are distinctions in crystalline structure between the samples of the three elemental compositional groups, being quartz, calcite, dolomite and mica the main crystalline phases present in the samples. (author)

  5. Preparation and characterization of polymer nanocomposites based on chitosan and clay minerals; Preparacao e caracterizacao de nanocompositos polimerico baseados em quitosana e argilo minerais

    Energy Technology Data Exchange (ETDEWEB)

    Fiori, Ana Paula Santos de Melo; Gabiraba, Victor Parizio; Praxedes, Ana Paula Perdigao [Instituto Federal de Alagoas (IFAL), Marechal Deodoro, AL (Brazil); Nunes, Marcelo Ramon da Silva; Balliano, Tatiane L.; Silva, Rosanny Christhinny da; Tonholo, Josealdo; Ribeiro, Adriana Santos, E-mail: aribeiro@qui.ufal.br [Universidade Federal de Alagoas (UFAL), Maceio, AL (Brazil)

    2014-09-15

    In this work nanocomposites based on chitosan and different clays were prepared using polyethyleneglycol (PEG) as plasticizer. The samples obtained were characterized by Fourier Transform Infrared Spectroscopy (FTIR), X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), thermogravimetric analysis (TGA/DTG) and by mechanical characterization (tensile test) with the aim of investigating the interactions between chitosan and clay. The nanocomposite films prepared using sodium bentonite (Ben) showed an increase of 81.2% in the maximum tensile stress values and a decrease of 16.0% in the Young’s modulus when compared to the chitosan with PEG (QuiPEG) films, evidencing that the introduction of the clay into the polymer matrix provided a more flexible and resistant film, whose elongation at break was 93.6% higher than for the QuiPEG film. (author)

  6. Characterization and comparison of a agricultural and forestry residues for energy purpose; Caracterizacao e comparacao de residuos agricolas e florestais para a producao de energia

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Jofran Luiz de; Silva, Jadir Nogueira da; Pereira, Emanuele Graciosa; Machado, Cassio Silva; Bezerra, Maria da Conceicao Trindade [Universidade Federal de Vicosa (UFV), MG (Brazil). Dept. de Engenharia Agricola], Emails: jofranluiz@yahoo.com.br, jadir@ufv.br

    2010-07-01

    The large volume of waste generated by the industry of wood processing and agriculture is a problem existing in almost all regions of Brazil. Several environmental problems occur as contamination of soil and groundwater due to the accumulation and improper disposal of residues from forestry and agriculture industries. Brazil has agricultural and economic conditions to develop and take advantage of technologies to use wood and other biomass for energy purposes, for being privileged in terms of territorial extension, sunlight and water, essential factors for biomass production on a large scale. The wood chips and coffee husks are low cost residues, renewable and sometimes under utilized, they are environmentally friendly and potentially capable of generating heat, steam and electric power, thus they can contribute as an alternative fuel for generation of energy. In this context, this study aims to characterize and compare residues from the production of coffee and furniture industry. The biomasses were characterized and analyzed for density, heating value, proximate analysis (volatiles, ash and fixed carbon) and elemental composition. Results indicates large energy potential for coffee husks, with HHV equals to 18,6 MJ/Kg slightly higher than the HHV of the eucalyptus chip (17,3 MJ/Kg). (author)

  7. Biochemical and pharmacological characterization of irradiated crotamine by gamma rays of {sup 60}Co; Caracterizacao bioquimica e farmacologica da crotamina irradiada por raios gama de {sup 60}Co

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Karina Corleto

    2014-07-01

    The serum production in Brazil, the only effective treatment in cases of snakebites, uses horses that although large size, have reduced l lifespan compared with horses not immunized. Ionizing radiation has been shown as an excellent tool in reducing the toxicity of venoms and toxins isolated, and promote the achievement of better immunogens for serum production, and contributing to the welfare of serum-producing animals. It is known, however, that the effects of ionizing radiation on protein are characterized by various chemical modifications, such as fragmentation, cross-linking due to aggregation and oxidation products generated by water radiolysis. However, the action of gamma radiation on toxins is not yet fully understood structurally and pharmacologically, a fact that prevents the application of this methodology in the serum production process. So we proposed in this paper the characterization of crotamine, an important protein from the venom of Crotalus durissus terrificus species, irradiated with {sup 60}Co gamma rays. After isolating the toxin by chromatographic techniques and testing to prove the obtaining of pure crotamine, it was irradiated with gamma rays and subjected to structural analysis, Fluorescence and Circular Dichroism. Using high hydrostatic pressure tests were also conducted in order to verify that the conformational changes caused by radiation suffer modifications under high pressures. From the pharmacological point of view, muscle contraction tests were conducted with the objective of limiting the action of crotamine in smooth muscle as well as the change in the action of toxin caused structural changes to the front. Analysis of Circular Dichroism and Fluorescence showed changes in structural conformation of crotamine when subjected to gamma radiation and that such changes possibly occurring in the secondary and tertiary structure of the protein. The observed in pharmacological tests showed that the irradiated crotamine was less effective in lowering the vas deferens twitch in rats in comparison to native crotamine. In addition, the behavior of irradiated toxin in tonic contraction, modulated by noradrenaline, was different from that observed for the native toxin. (author)

  8. Chemical characterization of the gels produced by the diazotrophic bacteria Rhizobium tropici and Mesorhizobium sp; Caracterizacao quimica dos geis produzidos pelas bacterias diazotroficas Rhizobium tropici e Mesorhizobium sp.

    Energy Technology Data Exchange (ETDEWEB)

    Monteiro, Nilson Kobori [Departamento de Engenharia e Tecnologia de Alimentos, Instituto de Biociencias, Letras e Ciencias Exatas, Universidade Estadual Paulista, Sao Jose do Rio Preto - SP (Brazil); Aranda-Selverio, Gabriel; Exposti, Diego Tadeu Degli; Silva, Maria de Lourdes Corradi da [Departamento de Fisica, Quimica e Biologia, Faculdade de Ciencias e Tecnologia, Universidade Estadual Paulista, Presidente Prudente - SP (Brazil); Lemos, Eliana Gertrudes Macedo; Campanharo, Joao Carlos [Departamento de Tecnologia, Faculdade de Ciencias Agrarias e Veterinaria, Universidade Estadual Paulista, Jaboticabal - SP (Brazil); Silveira, Joana Lea Meira [Departamento de Bioquimica e Biologia Molecular, Universidade Federal do Parana, Curitiba - PR (Brazil)

    2012-07-01

    The exopolysaccharides with characteristics of gel produced by Rhizobium tropici (EPSRT) and Mesorhizobium sp (EPSMR) are acidic heteropolysaccharide composed mainly of glucose and galactose in a molar ratio of 4:1 and 5:1 respectively, with traces of mannose ({approx} 1%). Chemical analysis showed the presence of uronic acid, pyruvate and acetyl-substituents in the structures of both polymers. Experiments of gel permeation chromatography and polyacrylamide gel electrophoresis showed that EPSRT and EPSMR are homogeneous molecules with low grade of polydispersity. The EPS were characterized using spectroscopic techniques of FT-IR, {sup 1}H and {sup 13}C-NMR. (author)

  9. Characterization of pulsed x-ray beams for tests of electronic dosemeter performance; Caracterizacao de feixes de raios X pulsados para testes de desempenho de dosimetros eletronicos

    Energy Technology Data Exchange (ETDEWEB)

    Guimaraes, Margarete C.; Silva, Teogenes A. da, E-mail: mcg@cdtn.br, E-mail: silvata@cdtn.br [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte, MG (Brazil). Curso de Pos-Graduacao em Ciencias e Tecnologia das Radiacoes, Materiais e Minerais

    2013-10-01

    Electronic dosimeters, due to direct reading, have been increasingly used for individual or area monitoring for purposes of radiation protection in X-ray fields used in diagnostic radiology. Deficiencies of performance in pulsed beams of such dosimeters have been published, which are not detected by the calibration procedures and performance tests established by international standards only for continuous beams of radiation. In Brazil, there are no performance requirements of dosimeters in pulsed beams, or a laboratory that performs testing for reliability in the use of dosimeters. This study aims to characterize the X-ray machine Medical VMI 800 Plus in the Laboratory Calibration of Dosimeters of CDTN/CNEN - Brazilian CNEN institute - and study the feasibility of its use for performance testing of electronic dosimeters. (author)

  10. Resveratrol-loaded poly({epsilon}-caprolactone) microparticles: preparation and characterization; Microparticulas de poli({epsilon}-caprolactona) contendo resveratrol: preparacao e caracterizacao

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2011-07-01

    Resveratrol-loaded poly({epsilon}-caprolactone) (PCL) microparticles were obtained by simple emulsion/solvent evaporation method. Three drug-loaded formulations were prepared with the aim of investigating the influence of composition on the encapsulation efficiency. Morphological and spectroscopic methods were performed for these materials. The microparticles revealed residual moisture close to 1.5% and encapsulation efficiency above 80%. Spherical shape and smooth surface were observed by SEM. No pores were either verified. Resveratrol-loaded microparticles showed an average particle size of around 50 {mu}m. X-ray diffraction analysis demonstrated that the microencapsulation reduced the drug crystallinity. The FTIR results suggest that no chemical bond was formed between polymer and drug. (author)

  11. Characterization of TPS/PHBV blends prepared in the presence of maleated PHBV; Caracterizacao de blendas TPS/PHBV preparadas em presenca de PHBV maleatado

    Energy Technology Data Exchange (ETDEWEB)

    Magalhaes, Natalia F.; Andrade, Cristina T., E-mail: ctandrade@ima.ufrj.br [Instituto de Macromoleculas Professora Eloisa Mano/Universidade Federal do Rio de Janeiro, RJ (Brazil)

    2011-07-01

    Maleated derivatives of poly(3-hydroxybutyrate-3-hydroxyvalerate) (PHBV) were obtained in an internal mixer in the presence of maleic anhydride and benzoyl peroxide, and characterized by infrared spectroscopy. Extruded blends of cornstarch and PHBV were prepared with and without the addition of maleated PHBV. Although the X-ray diffractograms had revealed decreased crystallinity, the micrographs obtained by scanning electron microscopy indicated that the addition of the maleated derivatives led to a partial compatibilization. (author)

  12. Preliminary characterization in the development of the nano composite low density polyethylene with attapulgite clay; Caracterizacao preliminar no desenvolvimento de nanocompositos polietileno de baixa densidade/argila atapulgita

    Energy Technology Data Exchange (ETDEWEB)

    Domingos, Luanda G.; Rego, Jose K.M.A. do [Universidade Federal do Rio Grande do Norte, Programa de Pos-graduacao em Ciencia e Engenharia de Materiais, PPGCEM/UFRN, Natal, RN (Brazil); Ito, Edson N. [Universidade Federal do Rio Grande do Norte, Depto de Engenharia de Materiais, DEMat/UFRN, Natal, RN(Brazil); Acchar, Wilson [Universidade Federal do Rio Grande do Norte, Depto de Fisica, DF/UFRN, Natal, RN (Brazil)

    2011-07-01

    The aim of this study was a preliminary study of the physical, thermal and rheological properties of the materials to be used in the development of nano composite low density polyethylene (LDPE) with Brazilian attapulgite clay (ATP), with and without the use of a compatibilizing agent interfacial, polyethylene grafted with maleic anhydride (PE-g-MAH). The materials were characterized by X-ray diffraction (XRD), thermogravimetry (TG) and torque rheometry. The materials were characterized and potentially could be developed polymeric nano composites with technological applications using attapulgite fibers in the nanometer scale. (author)

  13. EPR response characterization of drugs excipients for applying in accident dosimetry; Caracterizacao da resposta RPE dos excipientes dos medicamentos para aplicacao em dosimetria de acidente

    Energy Technology Data Exchange (ETDEWEB)

    Marczewski, Barbara S.; Rodrigues Junior, Orlando; Galante, Ocimar L.; Costa, Zelia M. da; Campos, Leticia L. [Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil)

    2002-07-01

    Some drugs are widely used by the population and can be employed to dose retrospective. The carbohydrates (saccharides), commonly used as excipients in the pharmaceutical industry, produce a quantity of free radicals after gamma irradiation, making them useful for dosimetry in emergency or accident situations that imply in dose evaluation from the materials found nearly or in contact with victims. In general, EPR signal from pulverized pills of some drugs are very complex due to the variety of components in the formulation. Because of this fact, some pharmaceutical excipients identified in the pill composition were also analysed by EPR spectrometry. On the counter drugs were studied: Cebion glucose, AAS, Aspirina, Conmel, Lacto-Purga and sugar substitutive ZeroCal. The excipients were: lactose, amide, anhydrous glucose and magnesium stearate. In some samples the number of radicals produced increased with the dose, showing a linear response for a dose range of interest and an adequate sensibility for dosimetry in accident cases.

  14. Characterization of a clay from Vitoria da Conquista, Bahia, Brazil, by thermal analysis; Caracterizacao de uma argila de Vitoria da Conquista, BA, por analise termica

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, O.M.; Zandonadi, A.R.; Martins, M.V. Surmani; Carrio, J.A.G.; Munhoz Junior, A.H. [Universidade Presbiteriana Mackenzie, Sao Paulo, SP (Brazil)

    2010-07-01

    Kaolinitic clays are vastly used in ceramic industry. Light coloration burned clays are very useful in the coatings production because of their aesthetic. In this work clay material from Vitoria da Conquista (south-west Bahia, Brazil) was characterized by various techniques. Differential Scanning Calorimetry (DSC) shows a kaolinite characteristic curve with an endothermic peak at 492 deg C, which corresponds to the kaolinite - metakaolinite transformation. Transformation alpha to beta quartz is characterized by a 573 deg C peak. The samples were also characterized by water absorption and x rays powder diffraction. The 1100 deg C burned samples were tested by rupture tension with acceptable results. (author)

  15. Microstructural characterization of Ta-Si alloy as cast; Caracterizacao microestrutural de ligas Ta-Si no estado bruto de fusao

    Energy Technology Data Exchange (ETDEWEB)

    Silva, A.A.A.P. da; Coelho, G.C.; Nunes, C.A.; Suzuki, P.A.; Borges, S.P.T., E-mail: antonioaaps@gmail.co [Universidade de Sao Paulo (EEL/USP), Lorena, SP (Brazil). Escola de Engenharia; Faria, M.I.S.T. [Centro Universitario de Volta Redonda (UNIFOA), RJ (Brazil)

    2010-07-01

    Recent experimental studies developed in our group involving systems containing transition metals and silicon differed from the phase diagrams actually accepted. The objective of this study is to experimentally re-evaluate the invariant reactions involving liquid phase of the binary Ta-Si. Samples with different compositions were melted in arc furnace with non-consumable tungsten electrode in the copper crucible cooled water under argon atmosphere and titanium getter, using materials of high purity (minimum purity of 99.5% Ta and 99.999% Si). The samples were melted four times to ensure the microstructural and compositional homogeneity. The microstructures of the samples as cast were characterized by scanning electron microscopy (SEM/EDS) and X-ray diffraction (XRD). The results of this analysis led to a proposal for the phase diagram of Ta-Si slightly different than the diagram currently accepted. (author)

  16. Synthesis and characterization of alumina precursor and alumina to be used as nano composite; Sintese e caracterizacao de precursores de alumina e alumina para uso em nanocompositos

    Energy Technology Data Exchange (ETDEWEB)

    Antunes, M.L.P., E-mail: malu@sorocaba.unesp.b [Universidade Estadual Paulista Julio de Mesquita Filho (UNESP), Sorocaba, SP (Brazil); Santos, H. Souza [Universidade de Sao Paulo (IF/USP), SP (Brazil). Inst. de Fisica; Santos, P. Souza [Universidade de Sao Paulo (EP/USP), SP (Brazil). Escola Politecnica

    2009-07-01

    With the evolution of nanomaterials technology, mainly in the 90s, it was possible to observe produced composites with alumina matrix and nanomaterial as reinforcing materials. It results in a significant improvement of mechanical proprieties of these composites. Thenceforth the study of synthesis and characterization of nanostructured materials has attracted great scientific interest. In this perspective, the aim of this work is to present an experimental procedure to obtain nordstrandite (aluminum hydroxide) with nanometric dimensions. Nordstrandite synthesis, obtained by the reaction of slightly amalgamated aluminum foil with aqueous ethylene glycol, which allows the control of the size of crystal produced. This control could be confirmed by X-Ray Diffraction and Electron Microscopy. Thermal transformation study is also presented. This study allowed the identification of transition aluminas that have potential to produce nanometric aluminas. (author)

  17. Characterization of microstructure and catalytic of cerium oxide obtained by colloidal solution; Caracterizacao da microestrutura e da atividade catalitica de oxido de cerio obtido por solucao coloidal

    Energy Technology Data Exchange (ETDEWEB)

    Senisse, C.A.L.; Bergmann, C.P.; Alves, A.K., E-mail: carolinasenisse@hotmail.com [Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alege, RS (Brazil). Lab. de Materiais Ceramicos

    2012-07-01

    This study investigated to obtain particles of cerium oxide, for use as catalysts for the combustion of methane using the technique of through polymeric colloidal solution. Obtaining the colloidal system is based on hydrolysis of salts such as cerium acetylacetonate, cerium nitrate in the presence of additives such as polyvinylbutyral (PVB), polyvinylpyrrolidone (PVP) and polyvinyl acetate (PVA), at concentrations of 5, 10 and 15% in aqueous or alcoholic medium. These solutions containing ions of interest were subjected to a heat treatment at 650° C for 30 minutes, with heating rate of 2 ° C/ min. After heat treatment, the fibers were characterized according to their morphology, surface area, crystallinity, weight loss and catalytic activity. Samples obtained from cerium acetylacetonate were more reactive than the cerium nitrate to the combustion of methane, as showed greater conversions and higher temperatures reached during the process, which is of utmost importance since the combustion catalytic methane is used for generating thermal energy. After the reaction with methane, the samples underwent significant change in surface area, probably due to the intensity of combustion reactions of the nitrate and the generation of heat involved in this reaction, which gave rise to coarse particles. During the combustion process using the obtained from particles of cerium acetylacetonate, there was the release of large quantities of nitrogen compared to the results of assays with the particles obtained with cerium nitrate. (author)

  18. Characteristics of the radiochromic film Gafchromictm EBT3 model for use in brachytherapy; Caracterizacao do filme radiocromico Gafchromictm modelo EBT3 para uso em braquiterapia

    Energy Technology Data Exchange (ETDEWEB)

    Luvizotto, Jessica

    2015-07-01

    Brachytherapy is a radiotherapy treatment modality using radioactive sealed sources within walking distance of the tumor, reducing the risk of applying an unwanted dose to adjacent healthy tissues. For brachytherapy is reliable, it is necessary to establish a dosimetric practices program aimed at determining the optimal dose of radiation for this radiotherapy practice. This paper presents the application of two methodologies for the dosimetry using radiochromic films. Experimental measurements were performed with EBT3 films in phantoms consisting of homogeneous and heterogeneous material (lung, bone and soft tissue) built especially for dose measurements in brachytherapy. The processing and analysis of the resulting images of the experimental procedure were performed with ImageJ software and MATLAB. The results were evaluated from comparisons dose of experimental measurements and simulations obtained by the Monte Carlo method. (author)

  19. 2D seismostratigraphic inversion applied to a thin reservoir characterization; Inversao sismoestratigrafica 2D aplicada a caracterizacao de um reservatorio delgado

    Energy Technology Data Exchange (ETDEWEB)

    Rocha, Antonio Carlos de Almeida

    1998-12-01

    The purpose of this work is to estimate thin reservoir properties even without counting on a good quality and a homogeneous database. Following a regional geological setting, well data such as logs, reports, cores had led to an interpretation of the depositional model in which the sandstone interval is inserted as an filling an incised valley system. This knowledge is essential to provide elements for a final work judgement. The main geological properties were then extracted from logs. The geophysical approach has counted on a 1D modeling of the main well acoustic parameters and a 2D Seismostratigraphic Inversion with a {alpha} priori acoustic impedance, which was able to enhance the frequency content of the original data. After the interpretation of the inverted data, seismic attributes were then extracted. A multivariate statistics was performed in order to establish which correlations between geological and seismic would be carried forward. An Ordinary Kriging was applied to the 2D seismic attributes. The External Drift Kriging was used to derive maps of the geological properties with the constraint of seismic variables. The final geological properties maps are similar in shape and coherent with the depositional model proposed. (author)

  20. Mono terpenes characterization by {sup 1} H and {sup 13} C-1 NMR; Caracterizacao de monoterpenos por RMN - {sup 1} H e de {sup 13} C-1

    Energy Technology Data Exchange (ETDEWEB)

    Araujo, Martha T. de [Universidade Federal Fluminense, Niteroi, RJ (Brazil). Dept. de Fisico-Quimica; Silveira, Carmen L.P. [Universidade Federal Fluminense, Niteroi, RJ (Brazil). Dept. de Quimica Organica; Mcchesney, James D. [Mississippi Univ., University, MS (United States). Research Inst. of Pharmaceutical Sciences

    1991-12-31

    Artemisinine, a new lactone sesquiterpene containing one peroxide binding, is the main anti malarial agent obtained from the Artemisia annua L. Viewing to obtain a simple synthetic route for artemisinic acid preparation, which is the key intermediary for total synthesis of this type of anti malarial agent, R-carvone has been chosen as starting material. The S-carvone was used as model for reaction optimization and preparation of derivatives to be used for NMR studies. The main objective of this work is the signalling of the {sup 13} C and {sup 1} H NMR spectra, using the 2 D-COSY and 2 D-Hector spectra 4 refs., 3 figs., 1 tab

  1. Characterization of chemical compounds for dosimetry of the radiation in industrial processes; Caracterizacao de compostos quimicos para dosimetria das radiacaoes em processos industriais

    Energy Technology Data Exchange (ETDEWEB)

    Galante, Ana Maria Sisti

    1999-07-01

    Different chemical compounds have been studied to optimize dosimetric systems in irradiation processes. In this study 2,3,5 Triphenyl -2H- Tetrazolium Chloride, Brilliant Cresyl Blue, Bromocresol Green and Potassium Nitrate were investigated for their merits or faults, for {sup 60} Co gamma field, in order to verify if can be considered as dosimeters. Fricke solution was used as reference dosimeter to determine absorption dose rates at the gamma facilities.Only Bromocresol Green and Potassium Nitrate are recommended for dosimetry purposes since the main characteristics were achieved. The other two compounds could be used in dosimetry with changes in their formulation. Bromocresol Green and potassium Nitrate are reproducible and radiation sensitive for absorbed doses from 300 Gy to 150 kGy Bromocresol Green was used in liquid form and Potassium Nitrate was prepared in solid pellets form. Spectrophotometry in the visible region was used as the main detection technique, which allows relating optical absorption, before and after irradiation, with the absorbed dose. The maximum absorption wavelength for each compound was observed at 450-460nm for bromocresol Green and 546nm for Potassium Nitrate. Dose calibration curves are linear for both compounds in all dose intervals. When irradiated with accelerated electrons, with energies between o,9 MeV and 1,5MeV, optical absorption intensification, of about 2,6 times, was observed when comparing results for Potassium Nitrate, with those for gamma rays. All the evaluations are presented in this work. (author)

  2. Characterization and evaluation of residue 'grits' of the cellulose industry; Caracterizacao e avaliacao do resisduo 'grits' da industria de celulose

    Energy Technology Data Exchange (ETDEWEB)

    Destefani, A.Z.; Santos, M.M.; Holanda, J.N.F. [Universidade Estadual do Norte Fluminense Darcy Ribeiro (LAMAV/CCT/UENF), Campos dos Goytacazes, RJ (Brazil). Lab. de Materiais Avancados

    2010-07-01

    The cellulose industry generates huge amounts of solid waste residue called 'grits'. These wastes have been willing over time in landfills near the mills. However, this type of disposal is not environmentally friendly and can cause degradation and environmental pollution. In addition, environmental legislation increasingly severe and the high costs of landfill have led the search for new alternatives for final disposition of this abundant waste. In this context, this study is to characterize waste grits, generated by the cellulose industry in the region of Aracruz-ES. The residue samples were characterized in terms of chemical composition, X-ray diffraction, particle size distribution and thermal analysis (DTA and TGA). The characterization of the residual 'grits' demonstrated its potential as a feedstock for production of soil-cement bricks. (author)

  3. Synthesis and characterization of zeolite from coal ashes modified by cationic surfactant; Sintese e caracterizacao de zeolita de cinzas de carvao modificada por surfactante cationico

    Energy Technology Data Exchange (ETDEWEB)

    Fungaro, D.A.; Borrely, S.I., E-mail: dfungaro@ipen.br [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2012-01-15

    Zeolite synthesized from coal fly ash was modified with different concentrations (2 and 20 mmol.L{sup -1}) of hexadecyltrimethylammonium bromide (HDTMA-Br). The Non-Modified Zeolite (NMZ) and Surfactant-Modified Zeolites (SMZ) were characterized by X-ray fluorescence spectrometry, X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy, thermogravimetric analysis, among others. The SMS presented negative charge probably due to the formation of a partial bilayer of HDTMA on exchangeable active sites on the external surface of NMZ. A decrease in surface area was observed for SMZ as compared to NMZ indicating zeolite surface coverage with HDTMA-Br molecules. The crystalline nature of the zeolite remained intact after adsorption of surfactant and heating for drying. FTIR analysis indicated that there were no significant changes in the structure of the zeolite after adsorption of surfactant. (author)

  4. Characterization of two clays - attapulgite and sepiolite - before and after acid activation; Caracterizacao de duas argilas - atapulgita e sepiolita - antes e apos ativacao acida com HCl

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, R.N.; Soares, G.A., E-mail: renataoliveira@poli.ufrj.b [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil). Centro de Tecnologia; Barreto, L.S. [Universidade Federal de Sergipe (UFS), Sao Cristovao, SE (Brazil)

    2009-07-01

    Among the special clays, two of them are distinguished by their large surface area: attapulgite and sepiolite. Although, being natural clays, when they are removed from the formation sites, their structural channels may be filled of impurities. The process done to clean these channels is called acid activation. The present work aim to treated samples from both clays by using 3M and 5M HCl solution under ultrasonic waves for 1 hour. The characterization of the clays before and after activation was carried out by SEM/EDS, XRD and surface area measure by method BET. The acid treatments employed were too aggressive, in special that with 5M HCl solution, which results in partial lixiviation of these clays. (author)

  5. Characterization of deactivated catalytic cracking catalyst and evaluation as absorbent material; Caracterizacao de catalisador de craqueamento catalitico desativado e avaliacao como material adsorvente

    Energy Technology Data Exchange (ETDEWEB)

    Valt, R.B.G.; Kaminari, N.M.S.; Cordeiro, B.; Ponte, M.J.J.S.; Ponte, H.A. [Universidade Federal do Parana (UFPR), Curitiba, PR (Brazil)

    2010-07-01

    One of the main uses of catalysts in the petroleum industry is in step catalytic cracking, which after use and regeneration cycles generates large quantities of waste material. In this research the deactivated FCC catalyst was characterized before and after the electrokinetic remediation process, in order to assess the change of its structure and possible adsorptive capacity. Analyses of X-Ray Fluorescence Spectroscopy, Scanning Electron Microscopy and BET surface area measurement were performed. The analysis showed no structural change due to the process employed and that electrokinetic remediation has recovered 42% of adsorption capacity of the material, by removing about 89% of heavy metals adhered initially in the catalyst surface. (author)

  6. Purification and characterization of a gentiohexaose obtained from botryosphaeran by partial acid hydrolysis; Purificacao e caracterizacao de uma gentioexaose obtida de botriosferana por hidrolise acida parcial

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Iara Ribeiro; Monteiro, Nilson Kobori; Martinez, Paula Felippe; Izeli, Nataly Lino; Vasconcelos, Ana Flora Dalberto; Cardoso, Marilsa de Stefani; Silva, Maria de Lourdes Corradi da [UNESP, Presidente Prudente, SP (Brazil). Faculdade de Ciencias e Tecnologia. Dept. de Fisica, Quimica e Biologia]. E-mail: corradi@fct.unesp.br; Barbosa, Aneli de Melo [Universidade Estadual de Londrina (UEL), PR (Brazil). Dept. de Bioquimica e Biotecnologia; Dekker, Robert F.H. [Universidad de Castilla-La Mancha-IRICA, Ciudad Real (Spain); Silva, Gil Valdo Jose da; Moraes, Luis Alberto Beraldo de [Universidade de Sao Paulo (USP), Ribeirao Preto, SP (Brazil). Faculdade de Filosofia, Ciencias e Letras. Dept. de Quimica

    2008-07-01

    A hexa-oligosaccharide was obtained by partial acid hydrolysis from botryosphaeran, an exopolysaccharide (EPS) {beta}(1{yields}3; 1{yields}6)-D-glucan type, produced by the ascomyceteous fungus Botryosphaeria rhodina. The oligosaccharide was purified by gel filtration and charcoal-Celite column chromatography and the analysis was followed by HPAEC/ PAD. The structure was determined by NMR spectroscopy and mass spectrometry, which showed that the oligosaccharide consists of six {beta}-D-glucopyranosyl units O-6 substituted (gentiohexaose). (author)

  7. Physical-chemistry characterization of oil and biodiesel from Crambe abyssinica Hochst; Caracterizacao fisico-quimica do oleo e do biodiesel de DE Crambe abyssinica Hochst

    Energy Technology Data Exchange (ETDEWEB)

    Jasper, Samir Paulo; Biaggioni, Marco Antonio Martin; Silva, Paulo Roberto Arbex; Seki, Andre Satoshi; Saath, Reni [Universidade Estadual Paulista (FCA/UNESP), Botucatu, SP (Brazil). Fac. de Ciencias Agronomicas], E-mail: jasper@fca.unesp.br

    2010-07-01

    Currently, the production of biodiesel in the world is growing so rapidly, this interest and demand for biodiesel promote an increase in demand for raw materials, or lipids. Biodiesel is a substitute for diesel oil obtained by transesterification, acid or base, of the lipids present in oils and fats. The Crambe abyssinica Hochst is species plant that has attracted interest of Brazilian producers due to oil content, rusticity and mechanized cultivation, mainly as a crop of winter it becomes an option for most farmers in this period. This study aimed to characterize physical-chemical oil and biodiesel from Crambe abyssinica Hochst, in accordance with Resolution n. 42 of the ANP. The analysis of fatty acids of oil crambe showed high concentration of unsaturated fatty acids, which may not be suitable for the use of biodiesel in very cold regions, where it is used pure or in mixtures with diesel in large proportions. The biodiesel produced from Crambe abyssinica Hochst be revealed within the standards established by the National Agency of Petroleum, Natural Gas and Biofuels. (author)

  8. Application of artificial neural networks on the characterization of radioactive waste drums; Aplicacao de redes neurais artificiais na caracterizacao de tambores de rejeito radioativo

    Energy Technology Data Exchange (ETDEWEB)

    Potiens Junior, Ademar Jose; Hiromoto, Goro, E-mail: apotiens@ipen.b, E-mail: hiromoto@ipen.b [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2011-10-26

    The methodology consist of system simulation of drum-detector by Monte Carlo for obtention of counting efficiency. The obtained data were treated and a neural artificial network (RNA) were constructed for evaluation of total activity of drum. For method evaluation measurements were performed in ten position parallel to the drum axis and the results submitted to the RNA. The developed methodology showed to be effective for isotopic characterization of gamma emitter radioactive wastes distributed in a heterogeneous way in a 200 litters drum. The objective of this work as to develop a methodology of analyse for quantification and localization of radionuclides not homogeneous distributed in a 200 liters drum based on the mathematical techniques

  9. Isolation and characterization of delta toxin from the venom of Crotalus durissus terrificus; Isolamento e caracterizacao da delta toxina do veneno de Crotalus durissus terrificus

    Energy Technology Data Exchange (ETDEWEB)

    Campos, Lucelia de Almeida

    2006-07-01

    The Crotalus durissus terrificus venom has been so far described as being of low complexity, with four major components described: convulxin, gyroxin, crotoxin and crotamine. In recent studies, other components of this venom were characterized as, for example, an analgesic factor. In 1980, Vital Brazil predicted the existence of a toxin which could be involved in platelet aggregation, and named it delta toxin. However, this toxin has never been isolated or characterized. The aim of the present work was to purify and characterize this toxin. After FPLC size exclusion chromatography followed by reverse phase HPLC, an homogeneous fraction was obtained, with a molecular weight of 14,074.92 Da. When analyzed by SOS-PAGE, this toxin presented an anomalous behavior, with a molecular weight of 14 kDa, while in 2D gels, spots around 40 kDa and with an isoelectrical point between 4 and 5 were observed suggesting isoforms with glicosilation microheterogeneity. After trypsin digestion, the fragments were submitted to the swissprot databank showing high homology (43% coverage, 15 matching peptides) with trocarin, a prothrombin activator from Tropidechis carinatus. These data were further confirmed by aminoacid analysis. The toxin was tested for its ability to activate factor II and X using synthetic substrates. Our data indicate a direct activation of factor X. The same toxin also behaved as a potent direct platelet aggregation activator on washed platelets. Assays with specific inhibitors indicate that neither metalloproteinase, nor serinoproteinase or t lectin domains are involved in the aggregating activity, since EDTA, benzamidin and D-galactose did not inhibit the toxin. In the present work, we were able to identify, purify and characterize a new toxin from the brazilian rattlesnake. It behaved as predicted by Vital-Brazil and displayed direct factor X activating properties, also inducing platelet aggregation, even at low concentrations. Our data also indicate that it is probably a homotrimer with the subunities linked by hydrophobic and/or electrostatic interactions. (author)

  10. Biochemical and immunological characterization of the main products of crotoxin irradiation; Caracterizacao bioquimica e imunologica dos principais produtos gerados pela irradiacao de crotoxina

    Energy Technology Data Exchange (ETDEWEB)

    Nascimento, Nanci do

    1995-07-01

    Irradiation of crotoxin and its subunits with 2,000 Gy of {gamma}-rays from {sup 60} Co source leads to aggregation and generation of lower molecular wight breakdown products. Aggregates separated by gel filtration retain at least part of their higher-ordered structure, based on their reactivity with monoclonal antibodies known to react with conformation epitopes in native crotoxin. These same aggregates can serve as antigens to raise antisera that cross-reacts and neutralizes crotoxin. Compared with native crotoxin, aggregates appears less myotoxic, are largely devoid of phospholipase activity, and are virtually non-toxic in mice. These results indicate that irradiation of toxic proteins can promote significant detoxification, but still retain many of the original antigenic and immunological properties of native crotoxin. (author)

  11. Microstructural characterization of titanium dental implants by electron microscopy and mechanical tests; Caracterizacao microestrutural de implantes dentarios de titanio por microscopia eletronica e ensaios mecanicos

    Energy Technology Data Exchange (ETDEWEB)

    Helfenstein, B.; Muniz, N.O.; Dedavid, B.A., E-mail: bruhelfenstein@hotmail.co [Pontificia Univ. Catolica do Rio Grande do Sul (FE/PUC/RS), Porto Alegre, RS (Brazil). Fac. de Engenharia; Gehrke, S.A. [Universidade Federal de Santa Maria (FE/UFSM), RS (Brazil). Fac. de Engenharia; Vargas, A.L.M. [Parque Tecnologico da PUCRS (TECNOPUC/GEPSI), Porto Alegre, RS (Brazil). Grupo de Estudos de Propriedades de Superficies e Interfaces

    2010-07-01

    Mini screw types for titanium implants, with differentiated design, were tested for traction and torsion for behavior analysis of the shape relative to the requirements of ASTM F136. All implants showed mechanical tensile strength above by the standard requirement, being that 83.3% of them broke above the doughnut, in support of the prosthesis. Distinct morphologies in ruptured by mechanical tests, were obtained. However, both fracture surfaces showed fragile comportments. Metallographic tests, x-ray diffraction (XRD) and microhardness were used for microstructural characterization of material, before and after heat treatment. The presences of {beta} phase in screw surface after quenching treatment proves that the thermal treatment can contribute for mechanical resistance in surface implants. (author)

  12. Synthesis and characterization of semi-IPNs based on PVP and PLLA; Sintese e caracterizacao de semi-IPNs envolvendo os homopolimeros PVP e PLLA

    Energy Technology Data Exchange (ETDEWEB)

    Camilo, A.P.R.; Mano, V., E-mail: mano@ufsj.edu.b [Universidade Federal de Sao Joao del Rei (UFSJ), MG (Brazil). Dept. de Ciencias Naturais; Felisberti, M.I. [Universidade Estadual de Campinas (IQ/UNICAMP), SP (Brazil). Inst. de Quimica

    2010-07-01

    The specific interest in the synthesis of semi-IPNs based on PLLA and PVP homopolymers due to the fact these are biodegradable and biocompatible, which allows us to infer applications in the medical field as sutures, implants, matrices for controlled release of drugs etc. The objective was to prepare a multicomponent material amphiphile in the form of semi-interpenetrating polymer networks, based on poly (L-lactide), PLLA, hydrophobic homopolymer, and poly (vinylpyrrolidone), PVP, hydrophilic component. The preparation of semi-IPN combined the polymerization and crosslinking of N-vinylpyrrolidone in the presence of poly (L-lactide). The products were characterized by spectroscopic and thermal methods. (author)

  13. Planning of experimental removal of cadmium in finite bath system using the chocolate clay B as adsorbent; Caracterizacao de adsorvente (argila chocolate B) visando a remocao de cadmio

    Energy Technology Data Exchange (ETDEWEB)

    Mota, J.D.; Rodrigues, M.G.F.; Lima, W.S.; Souza, R.S., E-mail: wsl_20@yahoo.com.br, E-mail: meiry@deq.ufcg.edu.br [Universidade Federal de Campina Grande (LABNOV/UFCG), PB (Brazil). Unidade Academica de Engenharia Quimica. Lab. de Desenvolvimento de Novos Materiais

    2012-07-01

    The smectite clays are characterized by having a high cation exchange capacity and ability to remove metal ions. They have great industrial importance, for its abundance and low cost. The first part of this work was to characterize the clay called Chocolate B through the techniques of X-Ray Diffraction, X-Ray Spectroscopy and Energy Dispersive Physical Adsorption of Nitrogen. The second part of the work aims to evaluate the significance of the variables: pH and initial concentration on removal of cadmium in a batch system. In the experimental design used was a 2{sup 2} factorial analysis with the addition at the central point, and evaluated the percentage of removal (Rem%) and removal capacity (EQF). XRD results corroborating the chemical analysis (EDX), characterized as a B Chocolate smectite clays. Statistical analysis showed a strong influence of variable pH on the removal of cadmium. (author)

  14. Characterization of poly(3-hydroxybutyrate) mats obtained by electro spinning method;Caracterizacao das mantas de poli(3-hidroxibutirato) obtidas pelo metodo de eletrofiacao

    Energy Technology Data Exchange (ETDEWEB)

    Goncalves, Joel; Branciforti, Marcia C.; Bretas, Rosario E.S.; Agnelli, Jose A.M., E-mail: joel13br@hotmail.co [Universidade Federal de Sao Carlos (UFScar), SP (Brazil). Dept. de Engenharia de Materiais

    2009-07-01

    Nanofibers of poly-3-hydroxybutyrate (PHB) were produced by electro spinning of chloroform/dimethylformamide (90 / 10% v/v) solutions. The influence of the solution concentration on the processing, morphology and properties of the nanofibers was evaluated. The nanofibers were characterized by wide-angle X-ray diffraction. The nanofibers morphology was evaluated by scanning electron microscopy (SEM). The thermal properties of the nanofibers were analyzed by differential scanning calorimetry (DSC). The results show that the obtained PHB nanofibers exhibit small average diameter (<500 nm) and narrow diameter distribution. A decrease in the fibers average diameters of PHB fibers with the decrease of the solution concentration was observed. The nanofibers were observed to be less crystalline than pure polymer. (author)

  15. Anti static agent characterization in polypropylene by using combined instrumental techniques; Caracterizacao de agente antiestatico em polipropileno atraves de tecnicas instrumentais combinadas

    Energy Technology Data Exchange (ETDEWEB)

    Gibertoni, Eliezer; Monteiro, Marcos R. [Sao Carlos Univ., SP (Brazil). Centro de Caracterizacao e Desenvolvimento de Materiais; Agnelli, Jose Augusto Marcondes [Sao Carlos Univ., SP (Brazil). Dept. de Engenharia de Materiais

    1999-07-01

    Antistatic agents are substances with are added to plastics molding formulations or to the surface of molded articles to minimize the accumulation of static electricity. The analysis and characterization of an antistatic agent in polypropylene using combined techniques provides very specific and detailed information. (author)

  16. Chemical characterization of polymeric surge arresters and insulators used in high voltage lines; Caracterizacao quimica de para-raios e isoladores utilizados em linhas de alta tensao

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira Junior, Joao B. de; Castro Junior, Joao B. de; Silva, Maria Elisa S.R. e; Freitas, Roberto F.S.; Sousa, Ricardo G. de [Lab. de Ciencia e Tecnologia de Polimeros, Dept. de Engenharia Quimica da EE.UFMG, Belo Horizonte, MG (Brazil); Souza, Breno P.G. de [CEMIG Distribuicao S/A, Belo Horizonte, MG (Brazil)], e-mail: bpgsouza@gmail.com

    2011-07-01

    In the last two decades, traditional porcelain and glass surge arresters and insulators, used in the electrical system, have been replaced by polymeric materials. For this type of application it is recommended that these devices have a high resistance to environmental stresses and impacts without suffering degradation process. Considering the environmental conditions these polymers are exposed to, when used for this purpose, studies of their chemical composition are needed. In this work, polymeric materials present in surge arresters and insulators used in electrical system were chemically characterized by Fourier Transform Infrared Spectroscopy (FTIR). FTIR analysis showed that the samples tested are made of poly(dimethylsiloxane) - PDMS (silicone) and additives such as alumina trihydrated [Al (OH)3] and calcium carbonate. (author)

  17. Characterization of isolated communities: application in the city of Ubatuba, Sao Paulo state, Brazil; Caracterizacao de comunidades isoladas: aplicacao em comunicade de Ubatura/SP

    Energy Technology Data Exchange (ETDEWEB)

    Ferreira, Maria Julita Guerra [Secretaria de Estado de Energia, Recursos Hidricos e Saneamento (SERHS), Sao Paulo, SP (Brazil)], e-mail: mjulita@sp.gov.br; Pilla, Adelina Teixeira Fonseca de [Equilibrio, Desenvolvimento Ambiental Ltda., Sao Paulo, SP (Brazil)], e-mail: adelina.fonseca@uol.com.br

    2004-07-01

    This paper presents a methodology for characterization of isolated communities, developed on a consultant work for the Ministry of Mines and Energy - MME. It still presents the application of this methodology of analysis on a isolated community in the city of Ubatuba, Sao Paulo state. (author)

  18. Characterization, analysis and dating of archaeological ceramics from the Amazon basin through nuclear techniques; Caracterizacao, analise e datacao de ceramicas arqueologicas da Bacia Amazonica atraves de tecnicas nucleares

    Energy Technology Data Exchange (ETDEWEB)

    Latini, Rose Mary

    1998-07-01

    The aim of this work is to contribute to the research in the reconstruction of part of the pre-history of the Amazon Basin by means of an analytical methods combined with multivariate analysis, given a analytic basis that can be continued by the archaeological work, through the identification, classification, provenance and dating the ceramics found in different archaeological sites of the Hydro graphic Basin of the Purus river. Neutron activation analysis in conjunction multivariate statistical methods were used for the identification and classification and thermoluminescence was used for the dating. Chemical composition results were in better agreement with archaeological classification for the archaeologically define Iquiri, Quinan and Xapuri phases and less characteristics the Iaco and Jacuru archaeological phase were not well characterized. An homogeneous group was established by most of the samples collected from the Los Angeles Archaeological Site (LA) and was distinct from all the other groups analysed. The provenance studies made with ceramics collected at this site shows that they were made with clay from nearby river (Rio Ina). From the LA ceramics dating the average date of site occupation was 1660 years. The ceramic dating results from the external wall of a circular earth wall construction confirm the relation with the local pre-history. Beyond the Acre material two urns were dated from the Archaeological Site Morro Grande and Sao Jose at Araruama, Rio de Janeiro. (author)

  19. Experimental characterization of a radiant porous burner for low temperatures using natural gas; Caracterizacao experimental de um queimador poroso radiante a gas natural para baixas temperaturas

    Energy Technology Data Exchange (ETDEWEB)

    Catapan, Rafael C.; Hissanaga, Newton Junior; Pereira, Fernando M.; Oliveira Junior, Amir A.M. de [Universidade Federal de Santa Catarina (UFSC), Florianopolis, SC (Brazil). Dept. de Engenharia Mecanica; Serfaty, Ricardo [PETROBRAS, Rio de Janeiro, RJ (Brazil). Centro de Pesquisas (CENPES); Freire, Luiz G.M. [PETROBRAS - RedeGasEnergia, RJ (Brazil)

    2004-07-01

    This article describes the experimental characterization of a radiant porous burner for temperatures between 500 deg C and 900 deg C. These low temperature radiant burners can be used in many practical applications as drying of paper and wood, plastic coating, food cooking and ambient heating. Two different configurations of silicon carbide porous ceramic foams were tested: one with a radian reflecting region (RRR) at the outlet and another without this region. Both configurations were able to sustain the reaction with equivalent ratio under 0,35. The configuration with a reflecting region was able to sustain flames with a minimum power of 60 kW/m{sup 2} and the other configuration with 100 W/m{sup 2}.The configuration with the RRR reached minimum superficial temperatures about 100 deg C lower than the other one. These results show that the reflecting region increases the heat recirculation inside the porous burner. The radiant efficiency varied from 20% to 35% for both burners. (author)

  20. Synthesis and characterization of NiO nanoparticles by Pechini method; Sintese e caracterizacao de nanoparticulas de NiO pelo metodo Pechini

    Energy Technology Data Exchange (ETDEWEB)

    Nascimento, A.; Ribeiro, M.A.; Costa, A.C.F.M.; Gama, L. [Universidade Federal de Campina Grande (UFCG), PB (Brazil). Dept. de Engenharia de Materiais; Bernardi, M.I.B. [Universidade de Sao Paulo (IFSC/USP), Sao Carlos, SP (Brazil). Inst. de Fisica

    2009-07-01

    In recent years, ultrafine magnetic particles of NiO have attracting the attention because of its unknown behavior, enormous scientific potential and technological application. Some of its more important properties are accented magnetic moments, double dynamic exchange, quantization of wave of spin and etc. In this context, this work has for objective to synthesize and to characterize nanoparticles of NiO for the Pechini method. The powder was analyzed by X-rays diffraction. The results of scanning electron microscopy, adsorption of nitrogen. The analysis of X-rays diffraction of the sample showed single-phase peaks of NiO, with crystallite size close to 38 nm. The surface area was 6.44 m{sup 2}/g. The image from scanning electron microscopy shows soft homogeneous agglomerates. The Pechini synthesis was efficient in the production of powders of NiO nano metrics and single-phase. (author)

  1. FTIR Spectroscopy characterization of PVC films grafted and heparinized by gamma radiation; Caracterizacao de fimes de PVC enxertados e heparinizados via radiacao gama por espectroscopia FTIR

    Energy Technology Data Exchange (ETDEWEB)

    Panzarini, Luz C.G.A. [Centro Universitario da FEI, Sao Bernardo do Campo, SP (Brazil). Dept. de Engenharia Quimica]. E-mail: luz_con@yahoo.com.br; Guedes, Selma M.L. [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2005-07-01

    Polymeric biomaterials with surface hemo compatibility properties had been successfully synthesized by the grafting of hydrophilic monomers onto commercial polymeric films by the simultaneous gamma irradiation process. In this work was studied the simultaneous gamma irradiation of flexible PVC films in systems containing the hydrophilic monomer DMAEMA in different concentrations (30% and 45%) and heparin sodium salt aqueous solution (0,25% w/v). The irradiation of the samples was carried out in a {sup 60}Co source, with doses of 0-16 kGy and dose rates of 0,5 to 0,8 kGy h{sup -1}. The grafted copolymers obtained by this method were characterized by FTIR-ATR and PAS spectroscopy in both DMAEMA studied concentrations. The graft copolymer characterization, accomplished by FTIR-PAS evidenced the largest grafting levels for the irradiated samples with 45% of DMAEMA, however heparin presence was only evident on irradiated samples with 30% of DMAEMA. This studies shows that the grafting of the monomer occurs in the surface of the films and the excess of the grafting difficult the heparin linkages in the polymeric matrix. (author)

  2. Mineralogical characterization of the argillaceous material from the Municipality of Santa Barbara, Para, Brazil; Caracterizacao mineralogica de material argiloso proveniente do municipio de Santa Barbara, Para, Brasil

    Energy Technology Data Exchange (ETDEWEB)

    Hildebrando, E.A., E-mail: edemarino@ufpa.b [Universidade Federal do Para (UFPA), Maraba, PA (Brazil). Fac. de Engenharia de Materiais. Lab. de Materiais Ceramicos; Sheller, T.; Angelica, R.S. [Universidade Federal do Para (UFPA), Belem, PA (Brazil). Fac. de Geologia. Inst. de Geociencias; Neves, R.S. [Universidade Federal do Para (UFPA), Belem, PA (Brazil). Fac. de Engenharia Quimica. Inst. de Tecnologia

    2009-07-01

    In the present work were investigated mineralogical phases in a material with argillaceous characteristic of the region of Genipauba, Santa Barbara, State of Para. Characterization of the collected sample was performed by X-ray diffraction (XRD), differential thermal analysis (DTA), thermogravimetric analysis (TG) and infrared spectroscopy (IR). The results of the assays indicate the presence of the clay minerals like kaolinite and muscovite, as well as minerals as quartz and anatase. (author)

  3. Polymeric foam characterization for packing use for radioactive wastes transportation; Caracterizacao de espuma polimerica para uso em embalagens para transporte de rejeitos radioativos

    Energy Technology Data Exchange (ETDEWEB)

    Mourao, Rogerio Pimenta [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN), Belo Horizonte, MG (Brazil)] E-mail: mouraor@urano.cdtn.br; Mattar Neto, Miguel [Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil)] E-mail: mmattar@net.ipen.br

    2002-07-01

    Impact limiters are sacrificial components widely used to protect radioactive waste packages against damage arising from falls, fires and collisions with protruding objects. Several materials have been used as impact limiter filling: wood, expanded cement and polymeric foams. One of the most popular materials among package designers is the petroleum rigid polyurethane foam, owing to its toughness, workability, low specific weight, low costs and commercial availability. In Brazil, a new foam was developed using the polymer extracted from the castor-oil plant (Ricinus communis), a renewable source. Besides, no greenhouse gases are used during its manufacture. For a better performance, a detailed knowledge of the foam physical and mechanical properties is essential. A relatively vast amount of data about regular polymeric foams can be found in the literature and in several manufacturers' brochures, but no data has been published so far about the properties of the castor-oil foam. This paper presents the testing program carried out as part of ongoing research program aimed at developing a packaging for the transport of radioactive wastes. The results obtained reveal that the castor-oil foam has a mechanical behavior similar to that of regular foams, with good property reproducibility and homogeneity. (author)

  4. Synthesis and characterization of poly(styrene-co-methyl methacrylate); Sintese e caracterizacao do poli(estireno-co-metacrilato de metila)

    Energy Technology Data Exchange (ETDEWEB)

    Augustinho, Tiago R.; Abarca, Silvia A.C.; Machado, Ricardo A.F. [Departamento de Engenharia Quimica e Alimentos - Universidade Federal de Santa Catarina - UFSC, Florianopolis, SC (Brazil)

    2011-07-01

    Polystyrene (PS) is nowadays commonly used due its advantages over competitors. PS presents a lower cost when compared with Acrylonitrile Butadiene Styrene (ABS) and with Polyethylene Tere-phthalate (PET), and can be easier processed than polypropylene (PP). At expandable form (EPS), can be used as projective equipment, thermal insulation, floating boards, refrigerators, isothermal, and low cost applications such as packaging and disposable material. Searching for more resistant materials and with a low cost, researches with copolymers materials are being developed. In this study, copolymerization reactions were carried out by suspension polymerization using monomers styrene and methyl methacrylate (MMA) with styrene. Styrene was in the highest percentage in relation to the MMA. The MMA was selected because is a monomer that presents a higher resistance than PS. The copolymerization was confirmed by performing infrared spectroscopy (IR), nuclear magnetic resonance of hydrogen (RMN{sup 1}H), differential scanning calorimetry (DSC) and thermogravimetry (TGA). (author)

  5. Chemical and radiological characterization of meals served by the COSEAS (USP-SP); Caracterizacao quimica e radiologica de refeicoes servidas pelo COSEAS/USP-SP

    Energy Technology Data Exchange (ETDEWEB)

    Favaro, Deborah Ines Teixeira [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), SP (Brazil). Centro do Reator de Pesquisas. Lab. de Analise por Ativacao Neutronica], e-mail: defavaro@ipen.br; Chioccola, Gabriella Saitta; Bortoli, Maritsa; Cozzolino, Silvia Maria Franciscato [Universidade de Sao Paulo (USP), SP (Brazil). Faculdade de Ciencias Farmaceuticas. Lab. de Alimentos e Nutricao Experimental; Taddei, Maria Helena [Comissao Nacional de Energia Nuclear (CNEN), Pocos de Caldas, MG (Brazil). Coordenacao do Laboratrio de Pocos de Caldas (COLAB); Mazzilli, Barbara Paci [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), SP (Brazil). Div. de Radiometria Ambiental

    2009-01-15

    This study presents the results obtained for the chemical and radiological analyses of lunch meals served in the cafeteria at the University of Sao Paulo-USP (COSEAS restaurant) in Brazil, on 5 non-consecutive days. On each of the five days, the meals were collected in triplicate and then freeze-dried for analysis totalizing 15 samples. The determination of the proximate composition complied with the AOAC standardized methodologies. The content of Ca, Fe, K, Na, Se, and Zn was determined by instrumental neutron activation analysis and the method validation was performed by certified reference materials analyses. Based on the concentration data, the daily intake of each mineral was calculated (corresponding to 40% of the total daily intake) and compared to the new recommendations set by the National Research Council (USA) considering the 19-30 year-old women range group. Comparing the average values obtained in this study with the recommended values, it was possible to verify that for macronutrients and the micronutrients Fe, Se, and Zn the recommendations were followed; for Ca and K they were deficient and exceeded the recommendation value for Na. The radionuclides {sup 40}K, {sup 60}Co, {sup 137}Cs, and {sup 131}I were determined by gamma spectrometry; {sup 90}Sr by liquid scintillation and {sup 210}Po, {sup 234}U, {sup 232}Th, {sup 238}U, {sup 235}U, {sup 228}Th, {sup 230}Th, and {sup 232}Th by alpha spectrometry. All radionuclides are present in concentrations below the limits set by the Food and Agriculture Organization (FAO). (author)

  6. Physico-chemical characterization of biodiesel from pests attacked corn oil; Caracterizacao fisico-quimica do biodiesel de oleo de milho danificado por pragas

    Energy Technology Data Exchange (ETDEWEB)

    Carvalho, Fabia M.; Correa, Paulo C.; Martins, Marcio A.; Santos, Silmara B.; Damian, Amanda D. [Universidade Federal de Vicosa (UFV), MG (Brazil)], Emails: copace@ufv.br, aredes@ufv.br, syllmara@vicosa.ufv.br

    2009-07-01

    The biodiesel is a renewable energy source alternative to fossil fuels. The biodiesel synthesis can be made by many types of triglycerides transesterification, it is possible to use this biofuel in vehicles if it has the quality required from Agencia Nacional de Petroleo, Gas Natural e Biocombustiveis (ANP). Searching an application for pests attacked corn, there is feasibility technical for the biodiesel production from this corn oil. The biodiesel synthesis was made through ethyl transesterification process with alkaline catalyst using ethanol. The biodiesel physical-chemical characterization was performed using ANP methods. (author)

  7. Production and characterization of setting hydraulic cements based on calcium phosphate; Obtencao e caracterizacao de cimentos de fosfato de calcio de pega hidraulica

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Luci C. de; Rigo, Eliana C.S.; Santos, Luis A dos; Boschi, Anselmo Ortega [Sao Carlos Univ., SP (Brazil). Dept. de Engenharia de Materiais; Carrodeguas, Raul G. [Universidad de La Habana, Habana (Cuba). Centro de Biomateriales

    1997-12-31

    Setting hydraulic cements based on calcium phosphate has risen great interest in scientific literature during recent years due to their total bio compatibility and to the fact that they harden `in situ`, providing easy handling and adaptation to the shape and dimensions of the defect which requires correction, differently from the predecessors, the calcium phosphate ceramics (Hydroxy apatite, {beta}-tri calcium phosphate, biphasic, etc) in the shape of dense or porous blocks and grains. In the work, three calcium-phosphate cement compositions were studied. The resulting compositions were characterized according to the following aspects: setting times, pH, mechanical resistance, crystalline phases, microstructure and solubility in SBF (Simulated Body Fluid). The results show a potential use for the compositions. (author) 6 figs., 4 tabs.

  8. Synthesis and characterization of barium titanate, doped with europium and neodymium; Sintese e caracterizacao de titanato de bario, dopados com europio e neodimio

    Energy Technology Data Exchange (ETDEWEB)

    Sousa, Fernanda L.C.; Cabral, Alciney M.; Silva, Ademir O.; Oliveiro, Joao B.L., E-mail: nanda_louise@yahoo.com.br [Universidade Federal do Rio Grande do Norte (UFRN), Natal (Brazil). Instituto de Quimica

    2013-07-01

    This work aims at synthesize and characterize mixed oxides in Barium Titanium matrix in doping with Neodymium and Europium analyzing thermogravimetric curves, characteristic bands at infrared region of the polymer complex, which are intermediates to mixed oxides, and identify the formation thereof, and the crystallinity using XRD analysis.

  9. Characterization of nanoclays dispersion in NBR nanocomposites by X-ray diffractograms;Caracterizacao da dispersao de nanoargilas em nanocompositos de NBR por difratografias de raios-X

    Energy Technology Data Exchange (ETDEWEB)

    Sousa, Fabiula D.B.; Scuracchio, Carlos H.; Mantovani, Gerson L., E-mail: fabiulasousa@gmail.co [Universidade Federal do ABC (CECS/UFABC), Santo Andre, SP (Brazil). Centro de Engenharia Modelagem e Ciencias Sociais Aplicadas

    2009-07-01

    The main objective of this work is the study of nanoclays dispersion in NBR nanocomposites by X-ray diffraction. Nitrile rubbers NBR 3330 and NBR 3350 were used, both with 33%wt of acrylonitrile and with different Mooney viscosity. The nanoclays were bentonite, organically modified montmorillonite (Cloisite 30B{sup R}) and sodic montmorillonite. The results showed that the intercalation state of the filler had influence of both, the type of treatment at which clay was submitted and the molar mass of the polymer. (author)

  10. Preparation and characterization of blends containing silk fibroin and chitosan;Obtencao e caracterizacao de blendas de fibroina de seda e quitosana

    Energy Technology Data Exchange (ETDEWEB)

    Moraes, Mariana A. de; Nogueira, Grinia M.; Weska, Raquel F.; Beppu, Marisa M., E-mail: beppu@feq.unicamp.b [Universidade Estadual de Campinas (FEQ/UNICAMP), SP (Brazil). Faculdade de Engenharia Quimica

    2009-07-01

    The aim of this study was to prepare and characterize blend membranes of silk fibroin and chitosan. Moreover, a conformation of fibroin to a more stable form induced by the addition of chitosan was verified. Blend membranes of fibroin/chitosan were prepared in different proportions and had their crystallinity, structural conformation and thermal stability characterized. The results of crystallographic analysis (XRD) indicated the tendency to higher structural organization caused by the addition of chitosan. FTIR showed that, mainly in a content of chitosan of only 25%, fibroin is present in a more stable form. Thermal analyzes indicate that fibroin is thermally stable and that when its proportion in the blend increases, the temperature in which the degradation is initiated also does so. (author)

  11. Synthesis and characterization of dense membranes of silk fibroin with glycerin;Sintese e caracterizacao de membranas densas de fibroina de seda com glicerina

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Mariana F.; Moraes, Mariana A. de; Weska, Raquel F.; Nogueira, Grinia M.; Beppu, Marisa M., E-mail: beppu@feq.unicamp.b [Universidade Estadual de Campinas (FEQ/UNICAMP), SP (Brazil). Faculdade de Engenharia Quimica

    2009-07-01

    The addition of plasticizers seeks improvements in mechanical properties of dense membranes of silk fibroin with possible interactions by hydrogen bonds. The aim of the present study was to produce and characterize dense membranes of silk fibroin containing glycerin in two different concentrations. The characterization of the membranes was performed from scanning electron microscopy (SEM), mechanical traction tests, infrared spectroscopy (FTIR-ATR) and X-ray diffraction (XRD). The results indicated that the addition of glycerin allowed obtaining homogeneous and more crystalline membranes and improved their properties of elongation. (author)

  12. Characterization of different cassava samples by nuclear magnetic resonance spectroscopy; Caracterizacao de diferentes amostras de mandioca por espectroscopia de ressonancia magnetica nuclear

    Energy Technology Data Exchange (ETDEWEB)

    Iulianelli, Gisele C.V.; Tavares, Maria I.B., E-mail: gisele@ima.ufrj.br [Centro de Tecnologia, Instituto de Macromoleculas Professora Eloisa Mano, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ (Brazil)

    2011-07-01

    Cassava root (Manihot esculenta Crantz) is grown in all Brazilian states, being an important product in the diet of Brazilians. For many families of the North and Northeast states, it may represent the main energy source. The cassava root flour has high levels of starch, in addition to containing fiber, lipids and some minerals. There is, however, great genetic variability, which results in differentiation in its chemical composition and structural aspect. Motivated by the economic, nutritional and pharmacological importance of this product, this work is aimed at characterizing six cassava flour samples by NMR spectroscopy. The spectra revealed the main chemical groups. Furthermore, the results confirmed differences on chemical and structural aspect of the samples. For instance, the F1 sample is richer in carbohydrates, while the F4 sample has higher proportion of glycolipids, the F2 sample has higher amylose content and the F6 sample exhibits a greater diversity of glycolipid types. Regarding the molecular structure, the NMR spectra indicated that the F1 sample is more organized at the molecular level, while the F3 and F5 samples are similar in amorphicity and in the molecular packing. (author)

  13. Characterization of Sr{sub 2}Fe{sub 2}O{sub 5} ferrite; Processamento e caracterizacao de hexaferrita de estroncio

    Energy Technology Data Exchange (ETDEWEB)

    Monteiro Filho, F.; Rocha, W.A.; Correa, R.R. [Centro Federal de Educaco Tecnologica do Maranhao (CEFET-MA), Sao Luis, MA (Brazil). Programa de Pos-Graduacao em Engenharia de Materiais; Almeida, R.M.; Paschoal, C.W.A. [Universidade Federal do Maranhao (UFMA), Sao Luis, MA (Brazil). Dept. de Fisica

    2009-07-01

    In the present work, the Sr{sub 2}Fe{sub 2}O{sub 5} ferrite was obtained by the high energy milling technique using a milling power of 4:1 under different times (1, 5 and 10h). The product was calcined, grounded for the particles size reduction and sintered at temperatures of 1100, 1200 and 1300 deg C. Further, x-ray diffraction and scanning electron microscopy experiments were carried out in order to identify the phases and analyze the particles morphology, respectively. DC electrical conductivity measurements indicated that the strontium ferrite behaves as a semiconductor. At low temperatures, the bands conduction mechanism predominated; while the load carrier mobility diminished at high temperatures. The electrical conductivity of the strontium ferrite samples changed from 15.2 to 85({Omega}cm){sup -1}, and its resistivity assumed values between 0.012 to 0.066({Omega}cm). (author)

  14. Characterization of steel grit recovered from ornamental rocks waste by magnetic separation; Caracterizacao da granalha de aco recuperada do residuo de rochas ornamentais por separacao magnetica

    Energy Technology Data Exchange (ETDEWEB)

    Junca, E.; Telles, V.B.; Rodrigues, G.F.; Oliveira, J.R. de; Tenorio, J.A.S., E-mail: eduardojunca@gmail.co [Universidade de Sao Paulo (USP), SP (Brazil). Dept. de Engenharia Metalurgica e de Materiais; Instituto Federal de Ciencia e Tecnologia do Espirito Santo (IFES), Vitoria, ES (Brazil)

    2010-07-01

    The aim of this work is characterization of steel grit recovered from ornamental rock waste by magnetic separation. The magnetic separation was realized in three steps: first, using a high intensity wet magnetic separator, which used only the remaining magnetic field of equipment. In the second step, the magnetic material obtained in the first phase was subjected to a new manual magnetic separation using rare earth magnets. In a third step, magnetic material obtained with rare earth magnets was subjected to manual magnetic separation using ferrite magnets. After the magnetic separation, the material was sent to characterization which was obtained by chemical analysis, scanning electron microscopy, X-ray diffraction and size analysis. The size analysis showed that the concentrate range from 0,5 to 563,67 {mu}m with 4 wt.% over 100 {mu}m and content metallic iron of 93 wt%. (author)

  15. Treatment and characterization of fiber licuri for synthesis of polymeric composites; Tratamento e caracterizacao da fibra de licuri para sintese de compositos polimericos

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, J.C.; Miranda, C.S.; Carvalho, R.F.; Jose, N.M.; Boaventura, J.S., E-mail: jamersonoliveira1@hotmail.co [Universidade Federal da Bahia (GECIM/UFBA), Salvador, BA (Brazil). Inst. de Quimica. Grupo de Energia e Ciencias dos Materiais

    2010-07-01

    Natural fibers are materials of increasing use of polymeric composites, due to several advantageous properties compared to synthetic fibers: low cost, density, toxicity and excellent biodegradability. Licuri fiber is widely used in the manufacture of handicrafts, with a wide range of possible applications. Before this, characterize the properties of the fiber is of great interest economic, technological and social. This study characterized the fibers in nature, which were washed with water, treated with 5% H{sub 2}SO{sub 4} or 5% NaOH. Techniques were used FTIR, DSC, TGA and XRD, as well as analysis of surface reactivity of the acid and base. All treatments altered the surface of licuri, exposing reactive sites. It was observed that sodium hydroxide licuri changed significantly, as expected. These results are very significant for the recovery of a natural fiber (licuri), abundant in poor regions of the country. (author)

  16. Antimicrobial compounds in polyethylene films - characterization and content measurement techniques;Compostos antimicrobianos em filme de polietileno - tecnicas de caracterizacao e quantificacao

    Energy Technology Data Exchange (ETDEWEB)

    Pires, Marcia; Santos, Ramon V.; Perao, Leandro; Ellwangler, Manoela W.; Nonemacher, Regina F.; Moraes, Lilian T. de; Gorski, Sandro; Staub, Simone, E-mail: marcia.pires@braskem.com.b [Braskem S.A., Triunfo, RS (Brazil). III Polo Petroquimico. Centro de Tecnologia e Inovacao; Petzhold, Cesar L. [Universidade Federal do Rio Grande do Sul (PGCIMAT/UFRGS), Porto Alegre, RS (Brazil). Pos-Graduacao em Ciencia dos Materiais

    2009-07-01

    Developments have been done in the packaging market to attend the continuous changes in consumer demands and also to keep safety and shelf life of products during transportation and storage. Active packaging is the most innovative concepts in the market. It has been defined as a packaging that changes its conditions to extend shelf life. The objective of this work is the production and characterization of active polyethylene films with antimicrobial compounds. The initial results show that analytical techniques as RX fluorescence and FTIR can be used to characterize and quantify these compounds in polyethylene films. (author)

  17. Cloning, periplasmic expression, purification and structural characterization of human ribosomal protein L10; Clonagem, expressao, purificacao e caracterizacao estrutural da proteina ribossomal L10 humana recombinante

    Energy Technology Data Exchange (ETDEWEB)

    Pereira, Larissa Miranda

    2009-07-01

    The ribosomal protein L10 (RP L10) is a strong candidate to be included in the class of tumor suppressor proteins. This protein, also denominated as QM, is known to participate in the binding of ribosomal subunits 60S and 40S and the translation of mRNAs. It has a molecular weight that varies between 24 and 26 kDa and an isoelectric point of (pI) 10.5. The sequence of the protein QM is highly conserved in mammals, plants, invertebrates, insects and yeast which indicates its critical functions in a cell. As a tumor suppressor, RP L10 has been studied in strains of Wilm's tumor (WT-1) and tumor cells in the stomach, where was observed a decrease in the amount of its mRNA. More recently, the RP L10 was found in low amounts in the early stages of prostate adenoma and showed some mutation in ovarian cancer, what indicates its role as a suppressor protein in the development of these diseases. It has also been described that this protein interacts with c-Jun and c-Yes inhibiting growth factors and consequently, cell division. This work has an important role on the establishment of soluble expression of QM to give base information for further studies on expression that aim to evaluate the specific regions where it acts binding the 60S and 40S ribosomal subunits and translation, as well as its binding to proto-oncogenes. The cDNA for QM protein was amplified by PCR and cloned into periplasmic expression vector p3SN8. The QM protein was expressed in E. coli BL21 (DE3) in the region of cytoplasm and periplasm, the best condition was obtained from the expression of the recombinant plasmid QM p1813{sub Q}M at 25 degree C or 30 degree C, the soluble protein was obtained with small amounts of contaminants. The assays of secondary structure showed that the QM protein is predominantly alpha-helix, but when it loses the folding, this condition changes and the protein is replaced by {beta}- sheet feature. (author)

  18. Characterization of composite high density polyethylene and layered zirconium phosphate; Caracterizacao de composito de polietileno de alta densidade (HDPE) e fosfato de zirconio lamelar

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2011-07-01

    Zirconium phosphate (ZrP) (2 w%), synthesized by direct precipitation method, was used in the preparation of composite with high density polyethylene (HDPE), through extrusion processing in the molten state. Wide angle x-ray diffraction (WAXD), stress-strain mechanical analysis and scanning electron microscopy (SEM) techniques were used for ZrP, neat polymer and composite mechanical and morphologic characterization. Although there was a slight increase in the Young modulus, WAXD and SEM analysis showed that the intercalation of the HDPE matrix in the filler galleries did not occur, probably due to the insufficient lamellae spacing to intercalate the polymer chains. Then, a microcomposite was achieved. (author)

  19. Valoración histológica e histomorfométrica de un nuevo biomaterial, B-TCP+HA y colágeno tipo I : estudio experimental en conejos de Nueva Zelanda

    OpenAIRE

    García Callejas, María Esperanza

    2014-01-01

    OBJETIVOS 1- : Valoración histologica del comportamiento del B-TCP + HA + colágeno tipo I a distintas concentraciones vs control en defectos óseos alveolares en tibias de conejo a los 30, 60 y 90 días 2-Valoración radiografica del comportamiento del B-TCP + HA + colágeno tipo I vs control en defectos óseos alveolares en las tibias de conejo a los 30, 60 y 90 días. 3-Comprobar si los implantes del...

  20. Influence of quality control in clinical detectability of microcalcifications and fibers in several mammographic units; Influencia do controle de qualidade na detectabilidade clinica de fibras e microcalcificacoes em diversas unidades mamograficas

    Energy Technology Data Exchange (ETDEWEB)

    Medeiros, R.B.; Alves, F.F.R.; Ruberti, E.M.; Fingerman, F.; Elias, S.; Pavani, C.; Pires, S.R. [Universidade Federal de Sao Paulo (UNIFESP/EPM), SP (Brazil)]. E-mail: rbitelli@cfhr.epm.br

    2001-07-01

    Our goal is to know the clinical detectability (Pdet) of fibers and microcalcifications in several mammographic units. Images under routine techniques conditions were done in 8 equipment using the quality control and statistical phantoms. The Pdet was computed from the ALVIM's images that were read by 3 specialists, on the basis of levels reliable. The images have allowed to identify microcalcifications, fibers and masses {>=} 0.165; 0.53 and 3.16 mm, respectively for 0.86{<=}D.O{<=}2,05. The results of the Pdet have varied from 0.786 to 0.864 and have demonstrated the importance of the quality assurance program in the microcalcifications detection. (author)

  1. Use of clinical practice as a motivating tool of radioprotection teaching and radiopharmacology in early semesters of pharmacy course; Uso da pratica clinica como ferramenta motivadora de ensino de radioprotecao e radiofarmacologia em semestres iniciais em cursos de farmacia

    Energy Technology Data Exchange (ETDEWEB)

    Andrighetto, Daniela; Lüdke, Everton, E-mail: daniela.andrighetto@hotmail.com, E-mail: evertonludke@gmail.com [Universidade Federal de Santa Maria (CCNE/DEFIS/UFSM), RS (Brazil). Departamento de Fisica

    2014-07-01

    The research teaching methods aimed at the success of the higher education student in pharmacology and medicine courses in technical expertise in the fields of radiological protection, radiopharmacology and interventional radiology is extremely important in view of the progress of these sectors. The objective of this work is to propose a methodological sequence of teaching work with first-year students of pharmacy and medicine courses within a biophysical discipline where the integrated knowledge to clinical practice can be used for this purpose. The methodology was to assess individual learning of a group of N = 49 students of the first half in the age group of 17-19 years through conceptual acquisition by the traditional method of 'blackboard and chalk' and developed method that includes four pedagogical moments focused on the area health. An analysis of the evaluation student performance through Variance Analysis of a pathway showed improved scores with respect to the performance of application issues of knowledge concerning radiation protection and biological mechanisms of radiation with respect to the method of 'blackboard and chalk' with p < 0.05. Therefore, work with students with respect to the content in the form of six steps of clinical interest are a promising technique for radiation protection education in the early grades of college courses with experimental effectiveness.

  2. Pineal metastasis as first clinical manifestation of colorectal adenocarcinoma: case report Metástase pineal como primeira manifestação clinica de adenocarcinoma colorretal: relato de caso

    Directory of Open Access Journals (Sweden)

    RICARDO RAMINA

    1999-03-01

    Full Text Available Cerebral metastases from colorectal adenocarcinomas occur in 8% of the cases. Diagnosis is usually made when primary disease and widespread metastases are already known. We report the case of a patient with single metastases in the pineal region as the first clinical manifestation of a colorectal adenocarcinoma. A 48-year-old female with Parinaud's syndrome for 15 days prior her admission was evaluated in our clinic. She had no symptoms or signs of colorectal disease. MRI examination revealed an heterogeneous lesion with peritumoral gadolinium enhancement, located in the pineal region. The tumor was radically resected through an infratentorial/supracerebellar approach. Histology showed metastatic carcinoma and immunohistochemical examination showed gastrointestinal tract adenocarcinoma. Metastases to the pineal region are extremely rare and should be considered in the differential diagnosis of tumors of this region.Metástases cerebrais derivadas de adenocarcinomas colorretais ocorrem em 8% dos casos. Geralmente a doença primária e as metástases em outros órgãos já são conhecidas quando do momento das manifestações neurológicas. Descrevemos um caso de metástase única na região pineal que promoveu a primeira manifestação clínica de adenocarcinoma colorretal. Uma mulher de 48 anos de idade apresentava há quinze dias de sua admissão ao nosso serviço diplopia e síndrome de Parinaud . O exame de ressonância magnética revelou lesão heterogênea localizada na região pineal. O tumor foi completamente retirado por acesso infratentorial/supracerebelar. O exame histológico revelou tumor metastático indiferenciado e o exame imuno-histoquímico demostrou adenocarcinoma do trato gastrointestinal moderadamente diferenciado. Metástases para a região pineal são extremamente raras e devem ser consideradas no diagnóstico diferencial de tumores nesta região.

  3. Development and clinical implementation of a global software use and analysis of radiochromic s films; Desarrollo e implementacion clinica de un software global de uso y analisis de peliculas radiocromicas

    Energy Technology Data Exchange (ETDEWEB)

    Gimeno Olmos, J.; Martinez Fernandez, J. M.; Pastor Sanchis, V.; Gonzalez Perez, V.; Guardino de la Flor, C.; Dolores Alemany, V. de los; Crispin Contreras, V.

    2011-07-01

    The aim of this study was to gather information in one solution the different processes that occur with the use of radiochromic films: calibration, reading, corrections, step-absorbed dose, dose distribution analysis and comparison with reference distributions.

  4. Avaliação clínica da vertebroplastia percutânea transpedicular Evaluación clinica de la vertebroplastia transpedicular percutánea Clinic evaluation of transpedicular percutaneous vertebroplasty

    Directory of Open Access Journals (Sweden)

    André Rafael Hubner

    2011-01-01

    Full Text Available OBJETIVO: Avaliar a eficácia do efeito analgésico da vertebroplastia com polimetilmetacrilato (PMMA e da estabilização vertebral obtida nos pacientes com fraturas vertebrais patológicas e realizar uma revisão detalhada da técnica da vertebroplastia percutânea, analisando suas indicações. MÉTODOS: Análise retrospectiva de 64 procedimentos de vertebroplastia percutânea em 46 pacientes. Foram realizadas avaliações dos prontuários e das radiografias pré e pós-operatórias e em nova consulta de rotina, na qual foi aplicado o questionário de dor (escala analógica visual da dor. RESULTADOS: Entre os 46 pacientes analisados, 37 (80,4% eram do sexo feminino e 9 (19,6% do sexo masculino, com média de idade de 71 anos (desvio-padrão +/- 9,2, variando de 50 a 90 anos. Foram operados 64 níveis, com predomínio do segmento toracolombar, sendo realizadas 17 (26,6% vertebroplastias a maioria em pedículos de T12. Trinta e um pacientes (67,4% apresentaram apenas um nível fraturado, 12 (26,1% apresentaram 02 níveis operados e três pacientes (6,5% apresentaram 03 ou mais níveis operados. O diagnóstico de osteoporose foi o mais comum (33 casos, 71,7%. Quanto ao alívio da dor no pós-operatório, houve um alto índice de satisfação de 90 a 100% em 37 (80% pacientes. CONCLUSÃO: A vertebroplastia demonstra ser um procedimento eficaz no tratamento da dor por fratura patológica de coluna, sendo tamb��m utilizada em investigação diagnóstica (biópsia óssea. É um procedimento seguro com baixas taxas de complicações.OBJETIVO: Evaluar la eficacia del efecto analgésico y estabilización vertebral de la vertebroplastia con polimetilmetacrilato (PMMA en pacientes con fracturas patológicas de la columna vertebral, y realizar una revisión detallada de la técnica de vertebroplastia percutánea, analizando sus indicaciones. MÉTODOS: Evaluación retrospectiva de 64 fracturas tratadas en 46 pacientes sometidos a vertebroplastia percutánea en el período de enero de 2000 a diciembre de 2008. Los pacientes fueron evaluados por las historias clínicas, por las radiografías pre y postoperatorias y consultas de rutina en las cuales se realizaron encuestas de dolor (escala universal visual del dolor. RESULTADOS: 37 (80,4% eran mujeres y 9 (19,6% eran varones, con edad promedio de 71 años (desvío estándar de + / - 9,2, que oscila entre 50 y 90 años. 64 niveles fueron operados, con predominio de lo segmento torácico-lumbar, se realizaron 17 (26,6% la mayoría en pedículos vertebroplastia de T12. Treinta y un pacientes (67,4% tenían sólo un nivel de fractura, 12 pacientes (26,1% tenían 02 niveles y 03 (6,5% pacientes tenían 03 o más niveles de fractura. El diagnóstico de osteoporosis fue el más común (33 casos, el 71,7%. Cuanto al alivio del dolor postoperatorio, hubo un alto índice de satisfacción de 90 a 100% en 37 (80% pacientes. CONCLUSIÓN: La vertebroplastia es un procedimiento que probó ser eficaz en el tratamiento del dolor por fractura patológica de la columna, y también se utiliza con fines de diagnóstico (biopsia de hueso. Es un procedimiento seguro y tiene bajas tasas de complicaciones.OBJECTIVE: This paper evaluates the analgesic effect and obtained vertebral stability of percutaneous vertebroplasty with polymethylmethacrylate (PMMA in patients with vertebral pathological fractures, and performs a detailed revision of this technique. METHODS: A retrospective analysis of 64 percutaneous vertebroplasty procedures in 46 patients was performed. Patients were evaluated by medical records, pre and post-operative radiographs, and by pain status (visual analog pain scale. RESULTS: 37 (80.4% patients were female and 9 (19.6% male, with mean age of 71 years (standard deviation + / - 9.2, ranging from 50 to 90 years. Sixty-four levels were treated, with a predominance of thoracic-lumbar segment, the majority 17 (26.6% of vertebroplaties at T12 pedicle. Thirty-one patients (67.4% presented only one fractured level, 12 patients (26.1% presented 02 levels and three (6.5% presented 03 or more treated levels. Osteoporosis was the most common diagnosis (33 cases, 71.7%. A high satisfaction rate of 90 to 100% was observed to the majority of patients when considering relief of pain postoperatively. CONCLUSIONS: Vertebroplasty has proven to be an effective procedure to treat pain caused by pathological fracture, and it is also used for diagnostic investigation (bone biopsy. The technique is secure and has provided low complications rates.

  5. Temporal evolution of the environmental dose remaining in a clinical irradiation bunker after the cessation of irradiation; Evolucion temporal de la Dosis ambiental remanente en un bunker de irradiacion clinica tras el cese de la irradiacion

    Energy Technology Data Exchange (ETDEWEB)

    Ruiz Egea, E.; Sanchez Carrascal, M.; Torres Pozas, S.; Monja Ray, P. de la; Perez Molina, J. L.; Madan Rodriguez, C.; Luque Japon, L.; Morera Molina, A.; Hernandez Perez, A.; Barquero Bravo, Y.; Morengo Pedagna, I.; Oliva Gordillo, M. C.; Martin Olivar, R.

    2011-07-01

    In this paper we try to quantify the dose emitted by different radioactive processes that occur in the head of a clinical linear accelerator and the patient is irradiated, or walls of the bunker, converted into tertiary sources of radiation trying to establish the origin of the came in different parts of the bunker.

  6. Enfermedad neumocócica invasiva en adultos : Cambios en la presentación clinica y evolución tras la introducción del la vacuna neumococica conjugada heptavalente en niños

    OpenAIRE

    Burgos Cibrián, Joaquín

    2012-01-01

    La introducción de la vacuna neumocócica conjugada ha modificado los serotipos causantes de enfermedad neumocócica invasiva (ENI). El objetivo de este estudio fue analizar las diferencias en la presentación clínica entre la época pre y postvacunal. Realizamos un estudio observacional de todos los adultos hospitalizados con ENI, entre 1997 y 2001 (periodo prevacunal), y de 2006 a 2009 (periodo postvacunal). Comparamos la incidencia, la distribución de serotipos y la presentación clínica entre ...

  7. Contributions to the problems of generalization in the phonological intervention: a clinical approach Contribuições para os problemas de generalização em intervenção fonológica: uma abordagem clinica

    Directory of Open Access Journals (Sweden)

    Víctor M. Acosta Rodríguez

    2007-03-01

    Full Text Available PURPOSE: to describe the procedure which could be useful for teachers and speech therapists engaged within a school context, in the treatment of the phonological mistakes exhibited by children during their primary-school education. It is an attempt to present an intra-subject study and to observe the generalization suffered by the untrained phonemes and processes during the training of a phoneme. METHODS: two children with phonological impairment participated in this research. A Test of Phonology Acosta et al. (1998 was used for the analysis of the simplifications and, later on, an intervention program by minimal pairs was applied. RESULTS: the results seem to indicate that the treatment should start with the process affecting more phonemes and that the most difficult; for example, the phoneme where the process is compulsory applied, should be chosen as the one to be trained. CONCLUSION: the results showed that treatment must begin with the process that affects a major number of phonemes which have more difficulty in their production.OBJETIVO: descrever procedimento de intervenção fonológica. MÉTODOS: duas crianças com transtorno fonológico participaram do estudo. Foi aplicada a prova de Fonologia de Acosta et al. (1998 para o levantamento das simplificações e, posteriormente, aplicado o programa de intervenção por pares mínimos. RESULTADOS: observou-se generalização dos fonemas e processos fonológicos não treinados durante o tratamento. CONCLUSÃO: os resultados indicam que o tratamento deve começar por aqueles processos que afetam um maior número de fonemas e que apresentam maior dificuldade em sua produção.

  8. Influence of the curve density relative electron in dosimetry clinic in treatments stereo tactics; Influencia de la curva de densidad electronica relativa en la dosimetria clinica en tratamientos estereotaxicos

    Energy Technology Data Exchange (ETDEWEB)

    Moreno Saiz, C.; Benitez Villegas, E. M.; Casado Villalon, F. J.; Parra Osorio, V.; Bodineau Gil, C.; Garcia Pareja, S.

    2013-07-01

    The objective of this study is to analyze the difference between clinical dosimetry in the treatments with radiosurgery and stereotactic radiotherapy fractional obtained from the relative Electron density curve (Schneider 1996) tabulated and provided with the scanner's radiation therapy. (Author)

  9. Specialized consultant in radiological safety to the south central hospital of high speciality, PEMEX. IV. - October of 2001; Asesoria especializada en seguridad radiologica a la clinica al hospital central sur de alta especialidad, PEMEX. IV.- Octubre de 2001

    Energy Technology Data Exchange (ETDEWEB)

    Angeles C, A.; Vizuet G, J.; Benitez S, J. A.; Garcia A, J.; Rodriguez A, F

    2002-01-15

    The south central hospital of high speciality, dependent of PEMEX, It request consultant of the ININ to be able to maintain their sanitary license for the use of X-ray equipment for the radiologic diagnostic.The proposal of the ININ was to be a program of technical attendance, schedule monthly to be able to solve the observations that are presented in the use of those equipment, and that the hospital can conserve its respective sanitary license.(Author)

  10. Dissection of the sentry ganglion by laparoscopic boarding in patients with cervix uterine cancer clinical stages IA2 at IIB; Diseccion de ganglio centinela por abordaje laparoscopico en pacientes con cancer cervicouterino etapas clinicas IA2 a IIB

    Energy Technology Data Exchange (ETDEWEB)

    Valdez U, J.J.; Pichardo M, P.A.; Cortes M, G.; Escudero de los Rios, P. [Hospital de Oncologia. Centro Medico Nacional Siglo XXI. IMSS, Mexico D.F. (Mexico)

    2005-07-01

    The obtained results in presently study demonstrate that the feasibility of the detection of the sentry ganglion in cervix uterine cancer using a boarding by laparoscopic via, being necessary the use of twice labelled as much with patent blue and radioisotope (colloid of labelled rhenium with {sup 99m}Tc, total dose of 3 MCi) to achieve the identification of the ganglion. (Author)

  11. Specialized consultant in radiological safety to the Reforma peripheral clinic, PEMEX. - I. - May-June of 2003; Asesoria especializada en seguridad radiologica a la clinica periferica Reforma, PEMEX.- I.- Mayo-Junio de 2003

    Energy Technology Data Exchange (ETDEWEB)

    Torres P, A.; Garcia A, J.; Rodriguez A, F

    2003-07-15

    The Reforma peripheral clinic, dependent of PEMEX, It request consultant of the ININ to be able to maintain their sanitary license for the use of X-ray equipment for the radiologic diagnostic.The proposal of the ININ was to be a program of technical attendance, schedule monthly to be able to solve the observations that are presented in the use of those equipment, and that the clinic can conserve its respective sanitary license.(Author)

  12. Specialized consultant in radiological safety to the Reforma peripheral clinic, PEMEX. - IV. - November and December of 2002; Asesoria especializada en seguridad radiologica a la clinica periferica Reforma, PEMEX.- IV.- Noviembre y Diciembre de 2002

    Energy Technology Data Exchange (ETDEWEB)

    Angeles C, A.; Hernandez C, J. E.; Rodriguez A, F.; Garcia A, J

    2003-02-15

    The Reforma peripheral clinic, dependent of PEMEX, It request consultant of the ININ to be able to maintain their sanitary license for the use of X-ray quipment for the radiologic diagnostic.The proposal of the ININ was to be a program of technical attendance, schedule monthly to be able to solve the observations that are presented in the use of those equipment, and that the clinic can conserve its respective sanitary license.(Author)

  13. Specialized consultant in radiological safety to the clinical north central hospital of high speciality, PEMEX. IV. - December of 2001; Asesoria especializada en seguridad radiologica a la clinica hospital central norte de alta especialidad, PEMEX. IV.- Diciembre de 2001

    Energy Technology Data Exchange (ETDEWEB)

    Angeles C, A.; Vizuet G, J.; Benitez S, J. A.; Garcia A, J.; Rodriguez A, F

    2002-01-15

    The clinical north central hospital of high speciality, dependent of PEMEX, It request consultant of the ININ to be able to maintain their sanitary license for the use of X-ray equipment for the radiologic diagnostic.The proposal of the ININ was to be a program of technical attendance, schedule monthly to be able to solve the observations that are presented in the use of those equipment, and that the hospital can conserve its respective sanitary license.(Author)

  14. Specialized consultant in radiological safety to the Reforma peripheral clinic, PEMEX. - III. - September and October of 2002; Asesoria especializada en seguridad radiologica a la clinica periferica Reforma, PEMEX.- III.- Septiembre y Octubre de 2002

    Energy Technology Data Exchange (ETDEWEB)

    Angeles C, A.; Rodriguez A, F.; Garcia A, J

    2003-02-15

    The Reforma peripheral clinic, dependent of PEMEX, It request consultant of the ININ to be able to maintain their sanitary license for the use of X-ray equipment for the radiologic diagnostic.The proposal of the ININ was to be a program of technical attendance, schedule monthly to be able to solve the observations that are presented in the use of those equipment, and that the clinic can conserve its respective sanitary license.(Author)

  15. Specialized consultant in radiological safety to the Macuspana peripheral clinic, PEMEX. - IV. - November and December of 2002; Asesoria especializada en seguridad radiologica a la clinica periferica Macuspana, PEMEX.- IV.- Noviembre y Diciembre de 2002

    Energy Technology Data Exchange (ETDEWEB)

    Angeles C, A.; Hernandez C, J. E.; Garcia A, J.; Rodriguez A, F

    2003-02-15

    The Macuspana peripheral clinic, dependent of PEMEX, It request consultant of the ININ to be able to maintain their sanitary license for the use of X-ray equipment for the radiologic diagnostic.The proposal of the ININ was to be a program of technical attendance, schedule monthly to be able to solve the observations that are presented in the use of those equipment, and that the clinic can conserve its respective sanitary license.(Author)

  16. Clinical characterization of OSL dosimeters for use in dosimetry of teletherapy beams in conventional fractionation; Caracterizacion clinica de dosimetros OSL para su uso en dosimetria de haces de teleterapia en fraccionamiento convencional

    Energy Technology Data Exchange (ETDEWEB)

    Lopez V, A.; Gutierrez M, J. G.; Rivera M, T. [IPN, Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Av. Legaria No. 694, Col. Irrigacion, 11500 Mexico D. F. (Mexico); Velazquez T, J. J., E-mail: jggm25@yahoo.com.mx [Centro Medico Nacional Siglo XXI, Hospital de Oncologia, Departamento de Fisica Medica, Av. Cuauhtemoc No. 330, Col. Doctores, 06720 Mexico D. F. (Mexico)

    2015-10-15

    Optically stimulated materials are increasingly used for dosimetry in clinical settings; to be sure of the obtained reading their proper clinical characterization is necessary. Is important to know the homogeneity of a batch, reproducibility, be exposed to the same conditions of irradiation repeatedly and other dependences that could present such as energy, angular, the type of radiation which are exposed and the dose deposited in them. For characterization they were designed and implemented tests for each of the factors of interest, taking into account the need for them (calculations, manufacture of mannequins, conditions, practicality, etc.) It was shown that we can apply this dosimetry in clinical practice within a radiotherapy center, relying on the readings and practicality. (Author)

  17. Dosimetry characterization and clinical application of Exa skin: Bolus of high of high density for use with photons; Caracterizacion dosimetrica y aplicacion clinica de Exaskin: bolus de alta densidad para uso con fotones

    Energy Technology Data Exchange (ETDEWEB)

    Ortiz Seidel, M.; Velazquez Miranda, S.

    2013-07-01

    Bolus of high density eXaSkin of density 1.6 g/cm{sub 3} is calculated correctly in the planning systems, is easy to use and generates optimum coupling with the radiation area, at the same time which is easily reproducible in their placement, avoiding the use of electron beams. On the other hand its behavior varies very slightly with the presence of air gaps. (Author)

  18. 舍雷肽酶肠溶片对慢性鼻窦炎的疗效观察%ClinicaI Effects of Serrapeptase Enteric-coated Tablets in Treatment of Chronic Sinusitis

    Institute of Scientific and Technical Information of China (English)

    陈柏芝

    2009-01-01

    目的 观察舍雷肽酶肠溶片对慢性鼻窦炎疾病肿胀的疗效及安全性.方法 五官门诊慢性鼻窦炎病例60例,随机分为2组.实验组30例,入诊当天开始服药,每次1片,每日3次,饭后用温开水整片吞服.总疗程为14 d,并同时口服克林霉素0.3 g,每日2次(bid),共服6 d.对照组30例,入诊当天只服用克林霉素0.3 g,bid,共服6 d.观察治疗后第7、14 d,患者窦内部分炎症脓性分泌物、黏膜上皮化的变化,同时测试鼻窦肿胀程度.结果 治疗后7 d实验组和对照组窦内部分炎症脓性分泌物及黏膜上皮化的变化比较有显著差异(P<0.01),术后14 d,实验组治愈率明显高于对照组,差异有非常显著意义(P<0.01).2组均无严重不良反应发生.结论 舍雷肽酶肠溶片可明显缩短慢性鼻窦炎软组织肿胀程度和时间,效果可靠,且不良反应较轻.

  19. Analysis of the systems for management of radioactive wastes from nuclear medicine clinics of the city of Recife, Pernambuco, Brazil; Analise dos sistemas de gerenciamento de rejeitos radioativos de clinicas de medicina nuclear da cidade de Recife, PE

    Energy Technology Data Exchange (ETDEWEB)

    Lira, Renata Farias de; Lopes, Ferdinand de Jesus; Passos, Robson Silva; Silva, Valeria Cosma Bento da; Belo, Igor Burgo, E-mail: renatafariasdelira@hotmail.co, E-mail: ferdinand.lopes@oi.com.b, E-mail: robson.passos@hotmail.co, E-mail: Valleria_@hotmail.co, E-mail: Igor.burgo@gmail.co [Instituto Federal de Educacao, Ciencia e Tecnologia de Pernambuco, Recife, PE (Brazil); Santos, Marcus Aurelio Pereira dos, E-mail: masantos@cnen.gov.b [Centro Regional de Ciencias Nucleares (CRCN-NE/CNEN-PE), Recife, PE (Brazil)

    2009-07-01

    In nuclear medicine compounds marked with radionuclides, called radiopharmaceuticals, for obtention diagnostic information and for diseases treatment. The physicochemical characteristics of the radiopharmaceuticals determine his fixation at target-organ, and the physical characteristics determine the compound application in diagnostic or therapy. The handling of radiopharmaceuticals generates solid, liquid and gas wastes. The presence of these wastes implies in a adequate management according to regulation standards established by the Brazilian Nuclear Energy Commission (CNEN). The objective of safe management of radioactive wastes is to protect the human being and the preservation of the environment, limiting possible radiological impacts for the future generation, and comprehend a set of technical and administrative activities involved in the collection, segregation, handling, conditioning, transportation, storage, control and elimination, or the final deposition. This work intends to verify if the radioactive waste management systems from the nuclear medicine clinics at the city of Recife are conformal with te normative regulations issued by the CNEN. The initial obtained results are used to elaboration of conformal verification spreadsheet and its application in six nuclear medicine clinics at Recife

  20. Importance of the effective atomic number (Z{sub eff}) of TL materials for radiation dosimetry in clinical applications; Importancia del numero atomico efectivo (Z{sub eff}) de materiales TL para dosimetria de la radiacion en aplicaciones clinicas

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez M, P.R. [ININ, 52750 La Marquesa, Estado de Mexico (Mexico)]. e-mail: pgm@nuclear.inin.mx

    2008-07-01

    The electric power generation, it has been one of the radiation applications of bigger weight, mainly in developed countries. Another sector of more impact is without a doubt that of the medicine. However, for a sure operation with radiations, those international organisms of radiological safety, exist every time more precise detection systems. The thermoluminescent dosimetry is one of the more reliable methods for this purpose, for that several groups of investigators from different parts of the world, they have guided its investigations in the development of new TL materials. However, to avoid underestimate or overestimation of the measured dose with the use of these materials, it should take into account it effective atomic number (Z{sub eff}) it is well known that some TL materials considered as equivalent to the tissue, presents smaller TL intensity when being irradiated with low energy photons, while the TL material known as not equivalent to the tissue, they present the supra sensitivity effect for this radiation type. Nowadays, the estimate of the Z{sub eff} has not been clear, in this work the Z{sub eff} is determined by means of the traditional methods and an own method is presented for its determination. The results of the TL signal of different materials, when being irradiated with photons of effective energy between 24 keV and 1.25 MeV and their relationship with their calculated Z{sub eff} are also presented. (Author)

  1. Administered activities of {sup 18}F-FDG PET clinics in pediatrics patients in Brazil- preliminary study; Atividades administradas de {sup 18}F-FDG aos pacientes pediatricos nas clinicas PET no Brasil - estudo preliminar

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Cassio Miri, E-mail: cmo@cdtn.br [Universidade Federal de Minas Gerais (PCTN/UFMG), Belo Horizonte, MG (Brazil). Pos-Graduacao em Ciencias e Tecnicas Nucleares; Silva, Teogenes A. da, E-mail: silvata@cdtn.br [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte, MG (Brazil); Sa, Lidia V. de, E-mail: lidia@ird.gov.br [Instituto de Radioprotecao e Dosimetria (IRD/CNEN-RJ), Rio de Janeiro, RJ (Brazil)

    2013-07-01

    A survey was conducted among the Brazilian clinical PET, with the purpose of investigating the activities administered to pediatric oncology patients and assess whether significant differences between the protocols adopted. In addition, this survey can cooperate to the suggestion diagnostic reference levels (DRLs) in nuclear medicine. Although the methodology for delivering doses by most clinics be based on patient's weight, the results showed variations of up to 191, 6% between the activities administered in clinics, even for similar devices. The average value of the distribution of activities reported was 4.46 {+-} 1,6 MBq /kg. These data demonstrate the need for harmonization and optimization of {sup 18}F-FDG/PET procedures, as well as training for professionals involved in the clinical routine.

  2. Gingival healing after gingivectomy procedure and low intensity laser irradiation. A clinical and biometrical study in anima nobile; Reparacao gengival apos a tecnica de gengivectomia e aplicacao de laser em baixa intensidade. Avaliacao clinica e biometrica em humanos

    Energy Technology Data Exchange (ETDEWEB)

    Amorim, Jose Claudio Faria

    2001-07-01

    For the present study seven patients presenting periodontal disease were selected in a way that they required the performance of gingivectomy procedure in the region of premolars in both sides, being this in the upper or lower region. After the surgical procedure one side was submitted to low intensity laser radiation, wavelength 685 nm, power 50 mW and fluency of 4J/cm{sup 2}, contact mode. The other side was used as a control, not receiving any laser irradiation. Healing process for both sides, was clinically and biometrically evaluated and compared using photographs for the periods: pre-operative, immediate post-operative, 3, 7,14,21, 28 and 35 days. The analysis was performed by 3 specialists in Periodontology considering aspects of healing. Results were submitted to statistical analysis. Biometrical evaluation showed improvement of healing for the period of 21 and 28 days in the lased group. Clinical evaluation showed better reparation mainly after the third day for the active group. Laser group was considered to present an improved healing when compared to the control group. (author)

  3. Clinical and morphologic evaluation of Er:YAG laser action at the front of cervical dentinal hypersensitivity; Avaliacao clinica e morfologica da acao do laser de Er:YAG frente a hipersensibilidade dentinaria cervical

    Energy Technology Data Exchange (ETDEWEB)

    Rocha, Dalva Maria

    2001-07-01

    This work was achieved in vivo and in vitro to evaluate the efficiency of Er:YAG laser in the cervical dentinal hypersensitivity treatment (HSDC). The Clinical study was achieved in patients with HSDC. The treatment was realized in five sessions: the first for selection, the second for exams (clinic and X-Ray) and trying to remove the etiologic factors that could cause the HSDC. The third and fourth sessions were subjected to the radiation with that protocol: 60 mJ energy ,2 Hz frequency, 6 mm out of focus, under air cooling, 20 seconds each application which the same was repeated four times with one minute breaks, which scanning movements and without using anaesthetics. The fifth was evaluation. The patients were evaluated and registered in a subject scale of pain 0 to 3, in the beginning and end of each session of irradiation, and one month after the last session. The results showed that for the irradiated group occurs significant differences in the beginning of each session and between. For the control group did not occur significant differences in the beginning and after each session, but did show a difference between the sessions. As the control group as the irradiated group, had reduction of sensibility between the session. For the morphologic study nine teeth were selected, 7 molars and 2 pre-molars from operative dentistry discipline. Half of the surface was irradiated with Er:YAG laser, the same protocol used in vivo, and the other half was used as a control without receiving any laser irradiation. Subsequently, specimens were prepared for SEM examinations. The results showed that laser treated surfaces showed a reduction of dentine tubular diameter with partial or total closure of the dentine tubules. For the control group, it was observed bigger amounts smear layer and open dentine tubular. The results obtained indicated that the Er:YAG laser can contribute to the HSDC treatment. (author)

  4. Spatial map dose of nuclear medicine service of the Clinical Hospital of Botucatu, SP, Brazil; Mapa espacial de dose do servico de medicina nuclear do Hospital das Clinicas de Botucatu

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Caio V.; Mendonca, Caroline; Silva, Eduardo T.; Moriguchi, Sonia M.; Koga, Katia H., E-mail: caiov_oliveira@yahoo.com.br [Universidade Estadual Paulista Julio de Mesquita Filho (UNESP), Botucatu, SP (Brazil). Faculdade de Medicina

    2013-12-15

    This study was conducted to describe levels of occupational and environmental exposure of the Nuclear Medicine Service of the Clinical Hospital of Botucatu. To this end, measurements were made of the radiometric levels of points strategically defined, in all the environments, for a period of six months, sampling different days and times, during operation normal routine of the sector. The results allow to estimate the expected dose for each environment, comparing them to the dose limitation established by the National Commission of Nuclear Energy (CNEN), allowing better targeting of occupationally exposed individuals, indicating the points where the occupation should be the minimum required, enabling the reduction of risks to potential exposures. (author)

  5. Elements determination of clinical relevance in biological tissues Dmd{sup mdx}/J dystrophic mice strains investigated by NAA; Determinacao de elementos de relevancia clinica em tecidos biologicos de camundongos distroficos Dmd{sup mdx}/J por AAN

    Energy Technology Data Exchange (ETDEWEB)

    Metairon, Sabrina

    2012-07-01

    In this work the determination of chemistry elements in biological tissues (whole blood, bones and organs) of dystrophic mice, used as animal model of Duchenne Muscular Dystrophy (DMD), was performed using analytical nuclear technique. The aim of this work was to determine reference values of elements of clinical (Ca, Cl, K, Mg, Na) and nutritional (Br and S) relevance in whole blood, tibia, quadriceps and hearts from Dmdmdx/J (10 males and 10 females) dystrophic mice and C57BL/6J (10 males) control group mice, using Neutron Activation Analysis technique (NAA). To show in more details the alterations that this disease may cause in these biological tissues, correlations matrixes of the DMD{sup mdx}/J mouse strain were generated and compared with C57BL/6J control group. For this study 119 samples of biological tissue were irradiated in the IEA-R1 nuclear reactor at IPEN (Sao Paulo, Brazil). The concentrations of these elements in biological tissues of Dmd{sup mdx}/J and C57B/6J mice are the first indicative interval for reference values. Moreover, the alteration in some correlation coefficients data among the elements in the health status and in the diseased status indicates a connection between these elements in whole blood, tibia, quadriceps and heart. These results may help the researchers to evaluate the efficiency of new treatments and to compare the advantages of different treatment approaches before performing tests in patients with muscular dystrophy. (author)

  6. Security in inserting data into the system scheduler registration and verification and medical history; Seguridad en la insercion de los datos del planificador en el sistema de registro y verificacion y en la historica clinica

    Energy Technology Data Exchange (ETDEWEB)

    Camara, A.; Martinez, D.; Melchor, M.; Candela, F.; Asensio, M.; Gil, S.; Borreda, V.

    2011-07-01

    A critical process Service Radio physics and Radiation Protection is to manage the data resulting from the treatment planning of Radiation Oncology, including both its insertion in the registration and verification of the linear accelerator (data that will be treated later patients) as its final registration in the medical record.

  7. Nd:YAG laser in caries prevention: a clinical study; Avaliacao clinica da eficiencia do laser de Nd:YAG associado ao fluor fosfato acidulado na prevencao de caries de sulcos e fissuras de criancas e adolescentes

    Energy Technology Data Exchange (ETDEWEB)

    Boari, Heloisa Gomes Dimiranda

    2000-07-01

    The caries prevention by using laser irradiation has been investigated during the last 30 years. The Nd: YAG laser associated with acidulated phosphate fluoride has been shown as a very promising technique for enamel caries prevention. The aim of this work was to clinically evaluate the efficiency of Nd: YAG laser associated with acidulated phosphate fluoride in pit and fissure caries prevention of children and adolescents. In this work it was determined the dye that enhance the effect of Nd: YAG laser in enamel. It was selected 242 pre-molar and molar teeth from 33 children and adolescents, aged from 7 to 15 years old. The selected teeth were free from caries or decalcification marks (active white marks) to the clinical and radiographic exams. The teeth were divided into two groups: the first group was laser irradiated and their homologous remained as a control. The right side teeth were dye-assisted Nd:YAG laser irradiated. The dye solution was a moisture of dust coal and equal parts of water and alcohol. The irradiation conditions were 60 mJ/10 Hz, optical fiber in contact mode, with diameter of 300 {mu}m, resulting in an energy density of 84,9 J/cm{sup 2}. The oclusal surface of the teeth was completely irradiated, specially on the slopes and in the deepest part of the pits and fissures. This procedure was repeated three times. In the sequence it was applied the acidulated phosphate fluoride for 4 minutes. On the left side teeth - control group- only acidulated phosphate fluoride was applied for the same time. The final examination considered the presence of caries and active white marks after a period of one year. There were statistical significant differences (p < 0.01) between the lased + fluoride group and the non irradiated group. The present study concluded that the technique used in this work can be an alternative clinical method for caries prevention. (author)

  8. Accounting of costs in a service of physical health. Relative units of value in dosimetry clinic in teletherapy; Contabilidad de costes en un servicio de fisica medica. Unidades relativas de valor en dosimetria clinica en teleterapia

    Energy Technology Data Exchange (ETDEWEB)

    Font Gomez, J. A.; Gandia Martinez, A.; Jimenez Albericio, F. J.; Andres Redondon, M. M.; Mengual Gil, M. A.

    2013-07-01

    A single - although laborious - start in the economic and clinical management of our units can be come to the knowledge of the time invested in the tasks functional, having to differentiate them, name them and even encrypt them. The time spent in performing the tasks multiplied by the annual number of these will indicate the resources necessary to achieve our objectives. In addition, pooling the values of times that members of the Unit provide analysed inter-workers dispersal, their causes and possible solutions. The establishment of relative units of value in any process benefits all workers involved in the process since it allows to know the dispersion of the times that each person employed in the development of the tasks. (Author)

  9. Ventilatory-perfusory pulmonary scintigraphy as non invasive election procedure in patients with clinical suspicion of pulmonary thrombo emboli; Centelleografia pulmonar ventilatoria-perfusoria, como procedimiento no invasivo de eleccion en pacientes con sospecha clinica de tromboembolia pulmonar

    Energy Technology Data Exchange (ETDEWEB)

    Altamirano L, J

    2004-07-01

    30 patients were studied with suspicion of pulmonary thrombo emboli PTE, in a period of 9 months (January-September of 1992), 20 women and 10 men, with an age range of 26 to 88 years, average of 57.59 18.89. With respect to the clinical data, 24 presented breathing inadequacy (80%). 16 tachycardia (54%), 15 with thoracic pain (50%) and 4 with hemoptysis (13%). Of the cabinet studies, 12 presented electrocardiographic changes (IF, QIII, and TIII) (40%), 14 presented abnormalities in arterial gases. In the thorax tele, 8 presented abnormality; as spill, pneumonia, diaphragmatic elevation, etc. (26.6%) and of 14 the result was not reported (46 6%). They were carried out in all the patients, the ventilatory studies and perfusories in that order. A Siemens mark scintillation camera was used, with a collimator of low energy and of high resolution; the information was stored in a floppy disk, and later on they were printed in radiographic plaques of high resolution. The ventilatory study was carried out with 30 mCi of {sup 99m} Tc-DTPA, in radio aerosol form, emitted by a micro nebulizer, to which was applied a pressure of oxygen of 10 ml-min; during 10 to 15 minutes. They took projections antero, posterior, oblique antero left and right, oblique posterior left and right, each one with an acquisition of 150000 counts, or during 5 minutes. Later on and remaining the patient in supine position, was carried out the perfusory study, applying 3-4 mCi of {sup 99} Tc-MAA for endo venous via; they took the same projections that the ventilatory study, but with a density of information greater (500 000 counts each one). Both studies are printed in a radiographic plaque of high resolution, with which is interpreted and the study is filed. (Author)

  10. Gunshot wounds to the head. Correlations between CT and clinical findings, neurosurgical treatment and long-term sequels; Traumi cranio-encefalici da proiettile: correlazione tra tomografia computerizzata, clinica, trattamento neurochirurgico e sequele a distanza

    Energy Technology Data Exchange (ETDEWEB)

    Salzano, A.; Nocera, V. [Ospedale S. Giovanni di Dio, Frattamaggiore, NA (Italy). Servizio di Radiologia; De Rosa, A.; Nunziata, A. [Ospedale Loreto Mare, Neaples (Italy). Servizio di Radiologia; Rossi, E.; Brunese, L. [Universita' degli Studi Federico II, Neaples (Italy). Ist. di Scienze Radiologiche; Tuccillo, M. [Azienda Ospedaliera di Rilievo Nazionale A. Cardarelli, Neaples (Italy). Servizio di Radiologia; Grassi, R. [Seconda Universita' degli Studi, Neaples (Italy). Ist. di Radiologia

    2000-03-01

    With the aim of demonstrating the usefulness of computerised tomography (CT) findings in the planning of brain neurosurgery in gunshot victims, for prompt and successful treatment, 30 patients with brain gunshot wounds were examined with CT over 5 years. The mortality rate of firearm wounds of the skull base was 34% higher than that of the hemisphere; this is due to carotid hemorrhage and midbrain damage. Such traumas require emergency radiological diagnosis and neurosurgical treatment because of their severity and early irreversible complications. Complex operations and skilled surgeons may prevent disabling postoperative sequels. CT findings are indispensable and must be correctly interpreted. The radiologist and the neurosurgeon must collaborate closely and both must consider several diagnostic factors affecting surgical planning. [Italian] Scopo dello studio e' stato quello di dimostrare l'utilita' della semeiologia della tomografia computerizzata in relazione con la pianificazione dell'intervento neochirurgico, al fine di attuare con tempestivita' interventi chirurgici soddisfacenti e meno lesivi. Lo studio comprende 30 casi di lesioni cranio-encefaliche da arma da fuoco esaminate con tomografia computerizzata nel periodo di 5 anni. Materiali e metodi utilizzati sono analiticamente descritti. L'esperienza dimostra che nelle lesioni da arma da fuoco del basicranio si nota una mortalita' del 34% superiore rispetto a quelle piu' craniali come quelle emisferiche in relazione a emorragie carotidee e lesioni tronco-mesencefaliche. Tali traumi esigono diagnosi radiologica e terapia neurochirurgica d'urgenza per la gravita' e le precoci complicanze irreversibili. Cio' richiede interventi complessi e manualita' esperte e rapide al fine di evitare sequele postoperatorie invalidanti. La corretta e indispensabile interpretazione dei segni radiologici della tomografia computerizzata deve avvenire in stretta collaborazione tra il radiologo e il neurochirurgo, ed entrambi devono tenere conto di una vasta gamma di fattori diagnostici, prognostici e di strategia terapeutica, che influenzano il tipo di decisionalita' e di aggressivita' chirurgica.

  11. ERI and initial clinical experience with dosimetry check, a commercial software for dosimetry in vivo volumetric; ERI y experiencia clinica inicial con dosimetry check, un software comercial para dosimetria in vivo volumetrica

    Energy Technology Data Exchange (ETDEWEB)

    Pujades Claumarchirant, M. C.; Gimeno Olmos, J.; Garcia Martinez, T.; Carmona Meseguer, V.; Lliso Valverde, F.; Palomo Llinares, R.; Ballester Pallares, F.; Perez Calatayud, J.

    2013-07-01

    The objective of this work is to study the differences in dose at a point of reference between the result of calculation of dose and the planning system to establish a level of uncertainty of the system. In addition, evaluates its use in clinical routine and presents results obtained with the first patients. (Author)

  12. Clinic implementation of method Zacarias for the correction of errors of convergence of optimization of IMRT in lung; Implementacion clinica del metodo Zacarias para la correccion de errores de convergencia de optimizacion en la IMRT en pulmon

    Energy Technology Data Exchange (ETDEWEB)

    Pardo Perez, E.; Molina Lopez, M. Y.; Ruiz Maqueda, S.; Castro Novais, J.; Counago Lorenzo, F.

    2013-07-01

    The implemented procedure is acceptable per a unit of radiophysic since it does not increase planning time in more than 30 - 45 minutes. Plans thus obtained show an improvement in dosimetric parameters for a small increase in the complexity of the plan, without appreciable increase risk organ doses. (Author)

  13. OCTAVIUS 4D: Commissioning and routine clinical use of a device for VMAT verifications; OCTAVIUS 4D: establecimiento del estado de referencia inicial y uso en rutina clinica de un dispositivo para verifiicaciones VMAT

    Energy Technology Data Exchange (ETDEWEB)

    Gimeno Olmos, J.; Candela Juan, C.; Palomo Linares, R.; Carmona Meseguer, V.; Lliso Valverde, F.; Ballester Pallares, F.; Perez Calatayud, J.

    2015-07-01

    Purpose: To commission OCTAVIUS 4D and its arrays 729 and 1000 SRS for VMAT patient-specific QA verifications, and to provide clinical results obtained with this device. Methods: The performance of both arrays was analysed by evaluating: homogeneity, linearity, reproducibility and leakage current. The accuracy of the dose reconstruction of OCTAVIUS 4D with array 729 was evaluated through ion chamber measurements at several points of interest. The performance of both arrays was compared for the same clinical plans. Finally, results of the 3D gamma analysis performed in our hospital for more than 900 patient plans are provided. Results: Both arrays present good homogeneity, linearity, reproducibility, and negligible leakage current. Dose differences between OCTAVIUS-calculated doses and ion chamber measurements or TPS-calculated doses were within 2% for single field plans, and within 4% for clinical plans. The mean value of the local gamma passing rate (3%/3 mm) of clinical plans verified with array 729 is 89.7%, whereas for 1000 SRS it is 97.8%. Conclusions: OCTAVIUS 4D provides accurate 3D dose reconstructions from 2D dose measurements. Clinical results here presented may be used to establish reference levels for VMAT verifications with this device. (Author)

  14. WITHDRAWN: Corrigendum to "High-sensitive cardiac troponin I (hs-cTnl) values in patients with stable cardiovascular disease: An initial foray" [Clinica Chimica Acta 411 (2010) 812--817].

    Science.gov (United States)

    Schulz, Olaf; Reinicke, Markus; Berghoefer, Gunnar H; Bensch, Ricarda; Kraemer, Jochen; Schimke, Ingolf; Jaffe, Allan S

    2010-05-18

    This article has been withdrawn at the request of the author(s) and/or editor. The Publisher apologizes for any inconvenience this may cause. The full Elsevier Policy on Article Withdrawal can be found at http://www.elsevier.com/locate/withdrawalpolicy.

  15. Method for calibration of asymmetric jaws in hemi fields techniques and effects in clinical practice; Metodo para la calibracion de las mandibulas asimetricas en tecnicas de hemicampos y efectos en la practica clinica

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez Masgrau, V.; Sempau Roma, J.; Abella Cereigido, R.; Lopez Sanchez, M.; Perez Fernandez, M.; Gonzalez Leyba, M.; Artigues Pedrola, M.

    2013-07-01

    This paper presents a method improved very significantly the accuracy of calibration, providing a good homogeneity of the dose distribution in the area of union of fields. Also evaluates the effect that has this new calibration in clinical practice. (Author)

  16. Octavius 4D: Initial state of reference and clinical implementation of a new equipment for checks VMAT; Octavius 4D: Estado de referencia inicial e implementacion clinica de un nuevo equipamiento para verificaciones VMAT

    Energy Technology Data Exchange (ETDEWEB)

    Eno Olmos, J.; Carmona Mesequer, V.; Lliso Vlaverde, F.; Garcia Martinez, M. t.; Pujades Claumarchiran, M. C.; Palomo Llinares, R.; Ballester Pallares, F.; Perez-Calatayud, J.

    2013-07-01

    The objective of this work is the establishment of the State of initial reference of a new system of measurement with the above capabilities, as well as the evaluation of its use in clinical routine. (Author)

  17. Clinica Study of Doppler Characteristic about Aminiotic Fluid Flow of Normal Fetal Breathing%正常胎儿呼吸羊水流超声频谱特征的临床研究

    Institute of Scientific and Technical Information of China (English)

    董卫江; 谢小岚; 张京成

    2011-01-01

    Objective To explore the clinic value of Doppler spectrum characteristic about aminiotic fluid flow of fetal breathing. Methods 306 fetuses whose gestational age from 15~40 weeks were included. The aminiotic fluid flow in the extra-pulmonary respiratory track was detectde by Doppler ultrasound , and the Doppler spectrum and relevant parameter were obtained. Results All the Doppler spectrums were divided into 4 types, the type of spectrum was related to the gestational age. The type Ⅰ Doppler spectrum,and the breath out time/the breath in time (Tout/Tin) ra tio=0. 58±0. 05 marked fetal lung maturity. Conclusions Ultrasoud can effectively detecting Dopple spectrum of the aminiotic fluid flow of the fetal breathing . It was a effective method to evaluate the maturation of fetal lung.%目的 探讨超声检测胎儿呼吸羊水流多普勒频谱特征的临床意义.方法 随机选择妊娠15~40周306例胎儿,应用超声检测胎儿外呼吸道的呼吸羊水流,获得频谱图及相关参数.结果 胎儿呼吸羊水流频谱分为4种类型,频谱类型与孕周有关,Ⅰ型频谱及呼出波时间/吸人波时间(Tout/Tin)比值在0.58±0.05是胎肺成熟的标志.结论 超声能有效地检测出胎儿呼吸羊水流的频谱,可以作为临床评估胎肺成熟度的有效方法.

  18. Characterization of manganese phases in mineral processing products of the Azul Mine, Carajas. Metallurgical implications; Caracterizacao de fases manganesiferas em produtos de beneficiamento da Mina do Azul, Carajas. Implicacoes metalurgicas

    Energy Technology Data Exchange (ETDEWEB)

    Pereira, G.; Fernandez, O.J.Ch., E-mail: pereiragilcimar@hotmail.co, E-mail: ochoque.fernandez@gmail.co [Instituto Federal de Ciencia e Tecnologia do Para (IFPA), Belem, PA (Brazil). Curso de Engenharia de Materiais; Costa, M.L. da, E-mail: mlc@ufpa.b [Universidade Federal do Para (UFPA), Belem, PA (Brazil). Inst. de Geociencias

    2010-07-01

    Were characterized the manganese phases of the processing products using ore microscopy and x-ray diffraction, in order to contribute with new data and help the processing operations of the mine. Cryptomelane is the main manganese mineral in products, and pyrolusite and nsutite are in minor proportion. Were observed distinctive textures of the cryptomelane and others manganese phases, it were formed in different geological times and therefore affecting the operations in mineral processing, principally, comminution. The observed mineralogical variations affect too the unit operations when expand the pit. (author)

  19. Software development for a orifice plate characterization used in the oil and gas industry; Desenvolvimento de um 'software' para caracterizacao de placas de orificio utilizadas na industria do petroleo

    Energy Technology Data Exchange (ETDEWEB)

    Andreas, N. Andreas [Universidade Federal de Itajuba (UNIFEI), MG (Brazil)

    2008-07-01

    The petroleum industry is an economic area that has a strong impact, because this, the information precision is one of the most important facts and it is able to be defined with software simulation. The knowledge of the exactly quantify of petroleum is fundamental, and then the instrumentation is essential for this measurement. There are many mechanisms to measure the volume flow, and one of the most used is the Orifice Plates, which has been more common in the Natural Gas Industry. The software development goal is the characterization of these Orifice Plates, allowing that the constant, which characterizes certain Plate, to be determined without Labor instruments, for that the software has an actualized database. But, the software needs some variables, that are responsible for the environment characteristics and the used material, to calculate the constant of the Orifice Plate, for example, fluid viscosity, environment temperature and kind of the Orifice Plate. The utilized equations in this software are based on the Stolz II equations. This tool is able to facilitate the work in petroleum industry, besides it is done for mobile applications, allowing analyses in real time. (author)

  20. Characterization of isolated biomass of the fermentation processes for ethanol production for use as biofuels; Caracterizacao da biomassa isolada de processos fermentativos de producao de etanol para uso como biocombustiveis

    Energy Technology Data Exchange (ETDEWEB)

    Steckelberg, Claudia; Andrietta, Maria da Graca Stupiello; Andrietta, Silvio Roberto [Universidade Estadual de Campinas (CPQBA/UNICAMP), SP (Brazil). Centro Pluridisciplinar de Pesquisas Quimicas, Biologicas e Agricolas. Div. de Biotecnologia e Processos], Email: claudia@cpqba.unicamp.br

    2006-07-01

    This study has had the purpose of enhancing the knowledge on the dominant strains of ethanol fermentation process biomass to use as bio fuel. The attributes studied were: numerical taxonomy (Griffits, 1981) and fermentative performance. The results have showed that all strains have presented good fermentative characteristics. All strains have been classified as Saccharomyces. In this genus were found the follow species: chevalieri, coreanus cerevisiae. If the classification according Barnet (1992) is considered, all of them are representative of S. cerevisiae. (author)

  1. Synthesis, characterization and study of the magnetic properties of a coordination polymer containing cobalt(II) and copper(II); Sintese, caracterizacao e estudo das propriedades magneticas de um polimero de coordenacao contendo cobalto(II) e cobre(II)

    Energy Technology Data Exchange (ETDEWEB)

    Cunha, Tamyris T. da; Stumpf, Humberto O.; Pereira, Cynthia L.M., E-mail: cynthialopes@ufmg.br [Departamento de Quimica, Instituto de Ciencias Exatas, Universidade Federal de Minas Gerais, Belo Horizonte, MG (Brazil); Pires, Heber S.; Oliveira, Luiz F.C. de [Departamento de Quimica, Instituto de Ciencias Exatas, Universidade Federal de Juiz de Fora, MG (Brazil); Pedroso, Emerson F. [Departamento de Quimica, Centro Federal de Educacao Tecnologica de Minas Gerais, Belo Horizonte, MG (Brazil); Nunes, Wallace C. [Instituto de Fisica, Universidade Federal Fluminense, Niteroi, RJ (Brazil)

    2012-07-01

    This work describes the synthesis and characterization of two new compounds with ligand opy (N-(2-pyridyl)oxamate): the copper(II) precursor [Me{sub 4}N]{sub 2}[Cu(opy){sub 2}].5H{sub 2}O and Co{sup II} Cu{sup II} coordination polymer {l_brace}[Co Cu(opy){sub 2}]{r_brace}{sub n}x4nH{sub 2}O. This latter compound was obtained by reaction of [Me{sub 4}N]{sub 2}[Cu(opy){sub 2}].5H{sub 2}O and CoCl{sub 2}.6H{sub 2}O in water. The heterobimetallic Co{sup II} Cu{sup II} chain was characterized by elemental analysis, IR spectroscopy, thermogravimetry and magnetic measurements. Magnetic characterization revealed typical behavior of one-dimensional (1D) ferrimagnetic chain as shown in the curves of temperature (T) dependence of magnetic susceptibility ({chi}{sub M}), in the form of {chi}{sub M}T versus T, and dependence of magnetization (M) with applied field (H). (author)

  2. Synthesis and characterization of copolymers 4,5-dihydroisoxazole and (-)-menthyl acrylates; Sintese e caracterizacao de copolimeros de cadeia lateral derivados de acrilatos de 4,5-di-hidroisoxazol e do (-)-mentol

    Energy Technology Data Exchange (ETDEWEB)

    Passo, Joel A.; Merlo, Aloir A. [Universidade Federal do Rio Grande do Sul, Porto Alegre, RS (Brazil). Inst. de Quimica; Eccher, Juliana; Bechtold, Ivan H. [Universidade Federal de Santa Catarina, Florianopolis, SC (Brazil). Campus Universitario Trindade. Dept. de Fisica; Kelly, Stephen M., E-mail: aloir@iq.ufrgs.br [University of Hull, Hull (United Kingdom). Dept. of Chemistry

    2012-07-01

    Five monomers 5-[4-(5-cyano-4,5-dihydroisoxazol-3-yl)phenoxy]undecyl acrylate (7a); n-alkyl 3-{l_brace}4-[5-(acryloyloxyundecyl)oxyphenyl]{r_brace}-4,5-dihydroisoxazole-5-carboxylate (7b,c for n-butyl and n-hexyl, respectively); 3-{l_brace}4-[5-(acryloyloxyundecyl) oxyphenyl]{r_brace}-4,5-dihydroisoxazole-5-carboxylic acid (7d) and (1R,2S,5R)-2-isopropyl-5-methylcyclohexyl acrylate (9) and the corresponding copolymers 10a-d,11 and homopolymers 12 from 7a and 13 from 9 were designed and synthesized. Except for acrylate 9 which is derived from (-)-menthol, all of the monomers belong to the series containing the isoxazoline ring linked to the acrylate unit by a flexible spacer chain of eleven methylene units. They presented low glass temperature and despite birefringence behavior, these copolymers showed no mesomorphic properties. (author)

  3. Radiation beans characterization and implantation for study of lead equivalent individual protection device used in radiodiagnostic practices; Caracterizacao e implantacao de feixes de radiacao para estudo de dispositivos de protecao individual com equivalencia em chumbo utilizados em praticas de radiodiagnostico

    Energy Technology Data Exchange (ETDEWEB)

    Pereira, Leslie Silva

    2004-07-01

    The protective shielding (IPC) must be used by occupationally exposed professionals, patients and volunteers, in order to optimize the doses who receive due to radiological practices. International and national norms establish the methodology to be adopted for determination of the IPC attenuation. In this work, the IPC had been submitted to X-rays beams with known characteristics, standardized for determination of their attenuation equivalent thickness by comparison to an experimental lead attenuation slope. This comparison technique allowed insurance estimative of the IPC attenuation equivalent thickness in mm of lead. Thus, it was possible to verify the conformity of the attenuation equivalent thickness determined experimentally and the value of the thickness indicated by the manufacturer. To carry out this work, it was necessary the implementation of experimental setups stated in the specifics norms, the study of the X-rays beams original features and the determination of combined additional filters, in order to allow the X-ray equipment used operates in compliance with Norm IEC 61331-1 IEC. The radiation quality selected is characterized by a 100 kV voltage and a 0.25 mm of copper overall filtration. The implementation of this radiation quality it was carried through of its first and second HVL (Half Value Layer). Thus, a methodology according to the international Norms has been implemented in the laboratory. The results of the present work provide suitable and useful information about radiation beams features related to the determination techniques of the attenuation properties. Once implemented the procedures for conformity evaluation of the protection devices, it will be possible to carry out specific quality control tests, which will be helpful to manufacturers, customers, as well as authorities in the radiological protection and health areas. (author)

  4. PLZT (9/65/35) sintering and characterization through the Pechini and partial oxalate processes; Sintese e caracterizacao de PLZT(9/65/35) via processo Pechini e oxalato parcial

    Energy Technology Data Exchange (ETDEWEB)

    Cerqueira, Marinalva [Rio Grande do Norte Univ., Natal, RN (Brazil). Dept. de Quimica; Nasar, Ricardo Silveira [Rio Grande do Norte Univ., Natal, RN (Brazil). Dept. de Fisica Teorica e Experimental; Leite, Edson Roberto; Longo, Elson [Sao Carlos Univ., SP (Brazil). Dept. de Quimica; Varela, Jode Arana [UNESP, Araraquara, SP (Brazil). Dept. de Quimica

    1996-12-31

    Zr Ti O{sub 4} obtained by the Pechini method was used as precursor for obtaining PLZT. An aqueous solution of oxalic acid was prepared with ZT, Pb (NO{sub 3}){sub 2} and La{sub 2} O{sub 3} particles. After the Pb C{sub 2} O{sub 4} and La{sub 2} O{sub 3} precipitation on ZT, the material was calcined and x-ray diffraction (XRD) showed the cubic phase of PLZT. This material was sintered in two steps and density about 8.0 g/cm{sup 3} were obtained. After second sintering XRD showed the occurrence of tetragonal and rhombohedral phases. This was caused by an estequiometric deviation, however the material showed a high optical transparency. (author) 11 refs., 6 figs., 1 tab.

  5. Monitoring and characterization of organic reactive species in the atmosphere: a tool for management of air quality; Monitoramento e caracterizacao de especies organicas reativas na atmosfera: uma ferramenta para gestao da qualidade do ar

    Energy Technology Data Exchange (ETDEWEB)

    Moreira, Andrea; Almeida, Jose Claudino; Loureiro, Luciana [PETROBRAS, Rio de Janeiro, RJ (Brazil). Centro de Pesquisas (CENPES). Monitoramento Atmosferico; Moreira, Lino [TRANSPETRO, Rio de Janeiro, RJ (Brazil); Grosjean, Daniel; Grosjean, Eric [DGA Inc., Ventura, CA (United States)

    2004-07-01

    The present paper briefly reports some monitoring campaigns carried out in Rio de Janeiro Metropolitan Area through 1999 a 2001, and presents some benchmarking with the study that took place in Porto Alegre from 1996 a 1999. These studies were developed through CENPES research projects, with partnership with local academy, international consultants, local environmental agencies and the environmental secretaries from the two cities. The main goal of both studies was to speciate and characterize the Volatile Organic Compounds (VOC's) present in the urban environments of both locations in order to assess the overall atmospheric reactivity and the ozone production potentials. Highest priority was given to the locations in which vehicular emissions played important role, once the core objective of both projects was to supply technical information on the atmospheric impact of motor fuels, with special emphasis on gasoline. With the continuation of Rio de Janeiro monitoring campaigns and the inclusion of Sao Paulo in the project as an additional monitoring area, the intention is to grant enough technical input and information to establish a data bank of ambient air concentrations of speciated reactive VOC's, fully customized to the Brazilian urban scenario, aiming to go farther in the realm of atmospheric chemistry and atmospheric reactivity. In essence, the effort devoted to raise local and experimental information on air quality and vehicle emissions aims to build sound scientific basis to technically support environmental management policies of best cost-effectiveness targeting secondary pollutants control in the urban atmospheres (author)

  6. Preparation and characterization of sugar cane bagasse fiber modified with nanoparticles of zirconium oxide; Preparacao e caracterizacao de fibras de bagaco de cana modificadas com nanoparticulas de oxido de zirconio

    Energy Technology Data Exchange (ETDEWEB)

    Carvalho, K.C.C. de; Mulinari, D.R.; Voorwald, H.C.J.; Cioffi, M.O.H., E-mail: kcccarvalho@hotmail.com.b [UNESP, Guaratingueta, SP (Brazil). Fac. de Engenharia. Dept. de Materiais e Tecnologia(FEG)

    2010-07-01

    The sugar cane bagasse fiber are renewable materials and have great application potential when used as reinforcement in a polymer matrix to give rise to composite materials and as supports for adsorption of heavy metals. This paper therefore describes the preparation and characterization of bleached and hydrated zirconium oxide modified sugar cane bagasse fiber by conventional precipitation method. Through the technique of electron microscopy we observed the presence of oxide nanoparticles on the fiber surface, proving the efficiency of the conventional precipitation method. With the X-ray diffraction analysis it was determined a decrease of 6.2% in the crystallinity index of modified fibers when compared to the bleached fibers showing the deposition of amorphous zirconium oxide on the fiber surface. (author)

  7. Chemical characterization of bottom ashes generated during combustion of a Colombian mineral coal in a thermal power plant; Caracterizacao quimica das cinzas de fundo originadas pela combustao, em usina termoeletrica, de um carvao mineral do nordeste da Colombia

    Energy Technology Data Exchange (ETDEWEB)

    Pinheiro, H.S.; Nogueira, R.E.F.Q.; Lobo, C.J.S.; Nobre, A.I.S.; Sales, J.C.; Silva, C.J.M., E-mail: hspfisica@hotmail.com [Universidade Federal do Ceara (UFC), Fortaleza, CE (Brazil). Centro de Tecnologia. Dept. de Engenharia Metalurgica e de Materiais

    2012-07-01

    Bottom ashes generated during combustion of a mineral coal from Colombia were characterized by X-ray fluorescence spectrometry and X-ray diffraction. The interest in this particular coal is due to the fact that it will be used by a thermal power plant in Ceara, Northeastern Brazil, where it could produce over 900 tons of different residues/combustion products every day. Results from Xray fluorescence allowed identification and quantification of elements present in the sample: silicon (59,17%), aluminum (13,17%), iron (10,74%), potassium (6,11%), titanium (2,91%), calcium (4,97%), sulphur (0,84%) and others (2,09%). The X-ray diffraction revealed patterns from silica, mullite, calcium sulphate and hydrated sodium. Results obtained so far indicate that the material is a potential raw-material for use in the formulation of ceramic components (author)

  8. Characterization of waste ceramic process for lost wax casting for employment as pozzolan; Caracterizacao do residuo de casca ceramica do processo de fundicao por cera perdida para emprego como pozolana

    Energy Technology Data Exchange (ETDEWEB)

    Machado, C.F.; Moravia, W.G., E-mail: carineferreiramachado@yahoo.com.br [Centro Federal de Educacao Tecnologica de Minas Gerais (CEFET/MG), Belo Horizonte, MG (Brazil). Departamento de Materiais

    2012-07-01

    There are about 30 companies of Lost Wax Casting in Brazil, and each one of them disposes around 50 to 100 tons of waste ceramic shell monthly. This work is concerned in the physical, chemical and microstructural characterization to evaluated the reactivity of this material. It was analyzed also the environmental risk of the material. The tests were made with a ceramic shell ground to evaluate the aspect of sustainable waste. In the physical characterization of the waste the density, specific surface area and distribution of the particle size were analyzed. In the chemical characterization, the powder was subjected to essays of fluorescence and pozzolanic activity. As for microstructural characterization scanning electron microscopy and Xray diffraction were carried out. The analysis of results shows that the ceramic shell powder is classified as non-inert waste, II-A Class, with density of 2,59 g/cm³. (author)

  9. Production and characterization of red mud based on glasses for the immobilization of nuclear wastes; Obtencao e caracterizacao de vidros a base de lama vermelha visando a imobilizacao de rejeitos nucleares

    Energy Technology Data Exchange (ETDEWEB)

    Vieira, Heveline

    2015-07-01

    Glasses based on red mud, a residual material from bauxite processing, were developed and characterized in this work. In order to promote its use, a minimum 60 wt% of red mud was used in the production of the glasses. According to XRD results, materials containing considerable amorphous phases were produced when using red mud as raw material. These amorphous phases were observed even though crystalline phases associated to Fe coming from the red mud itself were present. The material denominated 60L40S, which has a nominal composition of 60 wt% red mud showed the best properties comparing with the others compositions studied. However, these materials presented a high melting temperature. Changes in the composition of this material were made with the objective of lowering this temperature. Results indicated that the changes made to the material were successful in the reduction of the melting temperature. However, a reduction in the chemical properties of the resulting material was observed. Elements usually found in the chemical composition of nuclear wastes were added to the glasses produced. It was done with the objective of determining the effect of these elements on the chemical and physical properties of the red mud based glasses obtained. It was found that it was possible to add up to 15 wt% of these elements to the materials produced. The addition of these simulant materials promoted a reduction in the melting temperature of the resulting material. Above 15 wt%, the added elements precipitate in the structure of the resulting material. Even though the reduction in the chemical durability of the 60L40S material when simulant elements were added, it was observed that this material contained the simulant elements confined in its structure when in contact with water. This is a promising result, since it indicates that the 60L40S has the potential to immobilize elements from nuclear wastes . (author)

  10. Synthesis and characterization of ZSM-12 type zeolytic catalysts by using different aluminium sources in the petroleum industry; Sintese e caracterizacao de catalisadores zeoliticos do tipo ZSM-12 utilizando diferentes fontes de aluminio na industria do petroleo

    Energy Technology Data Exchange (ETDEWEB)

    Moraes, Marilia R.F.S.; Jesus, Daniela B.; Souza, Marcelo J.B. [Universidade Federal de Sergipe (UFS), Sao Cristovao, SE (Brazil). Dept. de Engenharia Quimica; Santos, Consuelo D.; Machado, Sanny W.M.; Pedrosa, Anne M. Garrido [Universidade Federal de Sergipe (UFS), Sao Cristovao, SE (Brazil). Dept. de Quimica

    2010-12-15

    The main objective was to synthesize and characterize ZSM-12 zeolites from different sources of aluminium, using hydrothermal method and characterize the catalysts synthesized by X-ray diffractions, thermal analysis and infrared absorption spectroscopy. The X-ray diffractogram showed the formation of zeolites of the family pantasil crystalline. Thermogravimetric curves and FTIR spectra were utilized by monitoring the removal of template and by monitoring the maintenance of zeolite structure. (author)

  11. Characterization of an extrapolation chamber and radiochromic films for verifying the metrological coherence among beta radiation fields; Caracterizacao de uma camara de extrapolacao e filmes radiocromicos para verificacao da coerencia metrologica entre campos padroes de radiacao beta

    Energy Technology Data Exchange (ETDEWEB)

    Castillo, Jhonny Antonio Benavente

    2011-07-01

    The metrological coherence among standard systems is a requirement for assuring the reliability of dosimetric quantities measurements in ionizing radiation field. Scientific and technologic improvements happened in beta radiation metrology with the installment of the new beta secondary standard BSS2 in Brazil and with the adoption of the internationally recommended beta reference radiations. The Dosimeter Calibration Laboratory of the Development Center for Nuclear Technology (LCD/CDTN), in Belo Horizonte, implemented the BSS2 and methodologies are investigated for characterizing the beta radiation fields by determining the field homogeneity, the accuracy and uncertainties in the absorbed dose in air measurements. In this work, a methodology to be used for verifying the metrological coherence among beta radiation fields in standard systems was investigated; an extrapolation chamber and radiochromic films were used and measurements were done in terms of absorbed dose in air. The reliability of both the extrapolation chamber and the radiochromic film was confirmed and their calibrations were done in the LCD/CDTN in {sup 90}Sr/{sup 90}Y, {sup 85}Kr and {sup 147}Pm beta radiation fields. The angular coefficients of the extrapolation curves were determined with the chamber; the field mapping and homogeneity were obtained from dose profiles and isodose with the radiochromic films. A preliminary comparison between the LCD/CDTN and the Instrument Calibration Laboratory of the Nuclear and Energy Research Institute / Sao Paulo (LCI/IPEN) was carried out. Results with the extrapolation chamber measurements showed in terms of absorbed dose in air rates showed differences between both laboratories up to de -I % e 3%, for {sup 90}Sr/{sup 90}Y, {sup 85}Kr and {sup 147}Pm beta radiation fields, respectively. Results with the EBT radiochromic films for 0.1, 0.3 and 0.15 Gy absorbed dose in air, for the same beta radiation fields, showed differences up to 3%, -9% and -53%. The beta radiation field mappings with radiochromic films in both BSS2 showed that some of them were not geometrically aligned. (author)

  12. Characterization by X ray diffraction of deleterious phases precipitated in a super duplex stainless steel; Caracterizacao por difracao de raios X de fases deleterias precipitadas em aco inoxidavel superduplex

    Energy Technology Data Exchange (ETDEWEB)

    Pardal, Juan M.; Tavares, Sergio S. Maior; Fonseca, Maria P. Cindra; Montenegro, Talles Ribeiro, E-mail: juanpardal@vm.uff.b [Universidade Federal Fluminense (PGEMEC/UFF), Niteroi, RJ (Brazil). Programa de Pos-graduacao em Engenharia Mecanica; Dias, Antonio Jose N.; Almeida, Sergio L. de [Instituto Nacional de Tecnologia (INT), Rio de Janeiro, RJ (Brazil). Div. de Materiais Ceramicos e Metalicos. Lab. de Tecnologia de Materiais

    2010-07-01

    In this work the identification and quantification of deleterious phases in two super duplex stainless steels grade UNS S32750, with quite different grain sizes, was performed by X-ray diffraction. The materials were isothermally aged in the 800 . 950 deg C range. Direct comparison method was used to quantify the ferrite phase in each sample. The amount of deleterious phases ({sigma}, {chi} and {gamma}2) formed was calculated by the difference of the amount of ferrite phase measured in each specimen to the amount of ferrite initially measured in the un-aged steel. The results obtained give an useful contribution to the understanding of kinetics of deleterious phases precipitation in super duplex steels. (author)

  13. Characterization of dental cement obtained from a glass prepared by the polymeric precursor method; Caracterizacao de cimento odontologico obtido a partir de um vidro preparado pelo metodo dos precursores polimericos

    Energy Technology Data Exchange (ETDEWEB)

    Bertolini, Marcio Jose; Zaghete, Maria Aparecida; Gimenes, Rossano; Paiva-Santos, Carlos de Oliveira [UNESP, Araraquara, SP (Brazil). Inst. de Quimica]. E-mail: marciobert@yahoo.com.br; Palma-Dibb, Regina Guenka [Sao Paulo Univ., Ribeirao Preto, SP (Brazil). Faculdade de Odontologia

    2005-09-15

    Glass ionomer cements are glass and polymer composite materials. These materials currently find use in dentistry. The purpose of this work is to obtain glass powders based on the composition 4.5SiO{sub 2} - 3Al{sub 2}O{sub 3} - 2CaO to be used in dentistry. The powders were prepared by a chemical route at 700 deg C. The properties of glass ionomer cements obtained from powders prepared at 700 deg C were studied. Diametral tensile strength and microhardness were evaluated for the experimental glass ionomer cements and a commercial material. It was concluded that the properties of experimental cements were similar to those of the commercial ones. (author)

  14. Synthesis and characterization of an additive type super plasticizers obtained from plastics cups of polystyrene; Sintese e caracterizacao de um aditivo tipo superplastificantes obtido a partir de copos plasticos de poliestireno

    Energy Technology Data Exchange (ETDEWEB)

    Araujo, Carolina G.L.; Freire, Carolina B.; Tello, Cledola C. de O., E-mail: carolina_gabriela316@yahoo.com.br, E-mail: cbf@cdtn.br, E-mail: tellocc@cdtn.br [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN/CNEN-BH), Belo Horizonte, MG (Brazil)

    2013-07-01

    This paper aims to describe the synthesis of an additive type superplasticizer from alternative material - plastic cups used of polystyrene - and characterize it physically and chemically in order to verify their efficiency and compare it with a commercial use superplasticizer. Following the search, the synthesized superplasticizer is used in mortars to assess their efficiency.

  15. Development of methodology for characterization of cartridge filters from the IEA-R1 using the Monte Carlo method; Desenvolvimento de uma metodologia para caracterizacao do filtro cuno do reator IEA-R1 utilizando o Metodo Monte Carlo

    Energy Technology Data Exchange (ETDEWEB)

    Costa, Priscila

    2014-07-01

    The Cuno filter is part of the water processing circuit of the IEA-R1 reactor and, when saturated, it is replaced and becomes a radioactive waste, which must be managed. In this work, the primary characterization of the Cuno filter of the IEA-R1 nuclear reactor at IPEN was carried out using gamma spectrometry associated with the Monte Carlo method. The gamma spectrometry was performed using a hyperpure germanium detector (HPGe). The germanium crystal represents the detection active volume of the HPGe detector, which has a region called dead layer or inactive layer. It has been reported in the literature a difference between the theoretical and experimental values when obtaining the efficiency curve of these detectors. In this study we used the MCNP-4C code to obtain the detector calibration efficiency for the geometry of the Cuno filter, and the influence of the dead layer and the effect of sum in cascade at the HPGe detector were studied. The correction of the dead layer values were made by varying the thickness and the radius of the germanium crystal. The detector has 75.83 cm{sup 3} of active volume of detection, according to information provided by the manufacturer. Nevertheless, the results showed that the actual value of active volume is less than the one specified, where the dead layer represents 16% of the total volume of the crystal. A Cuno filter analysis by gamma spectrometry has enabled identifying energy peaks. Using these peaks, three radionuclides were identified in the filter: {sup 108m}Ag, {sup 110m}Ag and {sup 60}Co. From the calibration efficiency obtained by the Monte Carlo method, the value of activity estimated for these radionuclides is in the order of MBq. (author)

  16. Characterization of gadolinia-doped ceria with manganese addition synthesized by the cation complexation technique; Caracterizacao de ceria-gadolinia e ceria-gadolinia-manganes sintetizados pelo metodo de complexacao de cations

    Energy Technology Data Exchange (ETDEWEB)

    Yang, J.D.; Muccillo, R.; Muccillo, E.N.S., E-mail: enavarro@usp.b [Instituto de Pesquisas Energeticas e Nucleares (CCTM/IPEN/CNEN-SP), Sao Paulo, SP (Brazil). Centro de Ciencia e Tecnologia de Materiais; Rocha, R.A. [Universidade Federal do ABC (CEMCSA/UFABC), Santo Andre, SP (Brazil). Centro de Engenharia, Modelagem e Ciencias Sociais Aplicadas

    2010-07-01

    Ceria-based compounds may be used for several technological applications like catalysts, grinding media and materials for electrolyte and electrodes in solid oxide fuel cells. For most of these applications fine powders are required. In this work, nanostructured ceria powders containing 20 mol % gadolinia with and without manganese addition were synthesized by the cation complexation technique. The prepared powders were calcined at 600 deg C for thermal decomposition of the metal citrate precursors. Results of X-ray diffraction, scanning electron microscopy and specific surface area evidenced the role of manganese on physical characteristics of the nanostructured materials. The cation complexation technique revealed to be a promising method for obtaining nanostructured powders with high yield and suitable physical properties for several technological applications. (author)

  17. Characterization of barite and crystal glass as attenuators in X-ray and gamma radiation shieldings; Caracterizacao da barita e do vidro cristal como atenuadores na blindagem das radiacoes X e gama

    Energy Technology Data Exchange (ETDEWEB)

    Almeida Junior, Airton Tavares de

    2005-03-15

    Aiming to determine the barium sulphate (BaSO{sub 4}) ore and crystal glass attenuation features, both utilized as shieldings against ionizing X and gamma radiations in radiographic installations, a study of attenuation using barite plaster and barite concrete was carried out, which are used, respectively, on wall coverings and in block buildings. The crystal glass is utilized in screens and in windows. To do so, ten plates of barite plaster and three of barite concrete with 900 cm{sup 2} and with an average thickness ranging from 1 to 5 cm, and three plates of crystal glass with 323 cm{sup 2} and with thicknesses of 1, 2 and 4 cm were analyzed. The samples were irradiated with X-rays with potentials of 60, 80, 110 and 150 kilovolts, and also with {sup 60}Co gamma rays. Curves of attenuation were obtained for barite plaster and barite concrete (mGy/mA.min) and (mGy/h), both at 1 meter, as a function of thickness and curve of transmission through barite plaster and barite concrete as a function of the thickness. The equivalent thicknesses of half and tenth value layers for barite plaster, barite concrete and crystal glass for all X-Ray energies were also determined. (author)

  18. Dating and characterization of archaeological ceramics of the Araruama area at Rio de Janeiro, Brazil; Datacao e caracterizacao de ceramicas arqueologicas da regiao de Araruama no Estado do Rio de Janeiro

    Energy Technology Data Exchange (ETDEWEB)

    Vinagre Filho, Ubirajara M. [Instituto de Engenharia Nuclear (IEN), Rio de Janeiro, RJ (Brazil); Bellido, Alfredo V.B.; Latini, Rose M. [Universidade Federal Fluminense, Niteroi, RJ (Brazil). Inst. de Quimica; Buarque, Angela [Museu Nacional, Rio de Janeiro, RJ (Brazil); Rossi, Alexandre M. [Centro Brasileiro de Pesquisas Fisicas (CBPF), Rio de Janeiro, RJ (Brazil)

    2000-07-01

    Ceramic of three archaeological sites (Serrano, Morro Grande, and condominium Bela Vista) of the Araruama area (Rio de Janeiro/Brazil), are being dated by the thermoluminescence technique. These ceramics are being characterized, in your elementary chemical composition, by INAA. Preliminary results are presented and the samples treatment method is described. (author)

  19. Microstructural characterization of IF steel after severe plastic deformation via ARB and subsequent heat treatment; Caracterizacao microestrutural de um aco IF apos deformacao plastica severa via ARB e posterior recozimento

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, F.C.; Abrantes, A.L.A.; Lins, J.F.C., E-mail: cristinafo2@hotmail.co [Universidade Federal Fluminense (PPGEM/UFF), Volta Redonda, RJ (Brazil). Programa de Pos-graduacao em Engenharia Metalurgica

    2010-07-01

    This study aimed to evaluate the microstructural evolution of a titanium stabilized IF steel deformed to warm through the ARB process for 5 consecutive cycles and then annealing at 600 deg C for 1 h. The material was characterized with the aid of the techniques of scanning electron microscopy and electron backscatter diffraction (Electron Backscatter Diffraction - EBSD). An intense process of microstructural refinement was observed in the deformed material and the phenomenon of dynamic recovery was predominant. It can be concluded that the annealing of severely deformed material was not sufficient for a complete recrystallization of the microstructure. (author)

  20. Chemical characterization of minerals from a commercial vitamin supplement using X-ray fluorescence and a portable equipment; Caracterizacao quimica de minerais em um suplemento vitaminico comercial por fluorescencia de raios X com equipamento portatil

    Energy Technology Data Exchange (ETDEWEB)

    Lopes, Fabio; Parreira, Paulo S.; Appoloni, Carlos R., E-mail: bonn@uel.b [Universidade Estadual de Londrina (UEL), PR (Brazil). Dept. de Fisica. Lab. de Fisica Nuclear Aplicada; Melquiades, Fabio L., E-mail: fmelquiades@unicentro.b [Universidade Estadual do Centro Oeste (UNICENTRO), Guarapuava, PR (Brazil). Dept. de Fisica

    2007-07-01

    Vitamins and mineral supplements are largely consumed by adult population; nevertheless, research has indicated that an inadequate ingestion of supplements may be more harmful than beneficial to the human body. This way, it is important to know the elemental chemical composition of such products. The technique employed in this work was energy dispersive X-ray fluorescence (EDXRF), using a portable equipment. The validation of the method was carried out by analysing two certified reference materials: SRM-1832 e 1833. Three samples of coated compressed tablets were selected, ground and then reconstructed in the form of pastile. The concentrations found, and their respective experimental errors, in mug g{sup -1}, were: Cl (22.4 +- 4.40), K (26.0 +- 1.15), Ca (148.7 +- 3.25), Mn (2.9 +- 0.54), Fe (6.3 +- 0.36), Cu(4.0 +- 0.14), Zn (70.9 +- 1.88), Se (0.1 +- 0.01), Br (0.2 +- 0.02), Sr (0.2 +- 0.01) and Mo (0.1 +- 0.01). It was possible to determine the detection limit for the elements Ca (0.29), Fe (0.09), Cu(0.05) e Zn(0.22), in mug g{sup -1}. From the eleven elements found in the analysed supplement sample, three (Cl, Br e Sr) were not mentioned in the product printed instructions (bull) and other three mentioned elements (V, Cr, Ni) have not been detected.

  1. Chemical characterization of composites developed from glycerol and dicarboxylic acids rein forced with piassava fiber; Caracterizacao quimica de compositos desenvolvidos a partir do glicerol e acidos dicarboxilicos reforcados com fibra de piacava

    Energy Technology Data Exchange (ETDEWEB)

    Miranda, Cleidiene S.; Oliveira, Jamerson C.; Guimaraes, Danilo H.; Jose, Nadia M., E-mail: cleidienesm@gmail.com [Universidade Federal da Bahia, Instituto de Quimica, GECIM - Programa de Pos-Graduacao em Engenharia Quimica, Salvador, BA (Brazil); Carvalho, Ricardo F. [Universidade Federal da Bahia, Escola Politecnica, Mestrado em Engenharia Ambiental Urbana, Salvador, BA (Brazil)

    2011-07-01

    In search of alternative technologies that enable the use of products with lower environmental impact, This study aims to develop a composite polymer-based piassava fiber. The sludge, waste and byproduct of commercial uses currently being used as reinforcement in polymer matrices, due to presence of lignocellulosic materials. The matrix polymer used was synthesized from glycerol with dicarboxylic acids, in order to open future perspectives on the use of glycerin generated from purified biodiesel production plastics. Composites with 2, 5, 10 wt% of piassava fiber cut into 5 mm raw and treated were obtained a mixture of solution. The materials were characterized by TGA, DSC, XRD and SEM. It was observed that the material under study is promising for the industrial market, because it has good compatibility with natural fibers allowing wider application of fiber natural and glycerol, producing semicrystalline composites and with good thermal properties. (author)

  2. Project, construction and characterization of ionization chambers for use as standard systems in X and gamma radiation beams; Projeto, construcao e caracterizacao de camaras de ionizacao para utilizacao como sistemas padroes em feixes de radiacao X e gama

    Energy Technology Data Exchange (ETDEWEB)

    Perini, Ana Paula

    2013-07-01

    Ionization chambers present some advantages in relation to other dosimeters: easiness of handling, low energy dependence and high precision. The advantages associated to ionization chambers and the large number of diagnostic radiology exams and therapeutic treatments motivated the development of this PhD program. In this project ionization chambers were developed and characterized to be applied in diagnostic radiology and therapy beam dosimetry, with high precision and performance, in compliance with international recommendations. They were assembled in a simple way, utilizing low-cost national materials, so they can be reproduced and applied at calibration laboratories. The project of these ionization chambers presents some differences in relation to commercial ionization chambers, as the materials utilized and geometrical arrangements. Besides the development of the ionization chambers to be utilized in standard X-ray beam dosimetry as work standard systems, two graphite parallel-plate ionization chambers were developed and characterized to be applied as reference standard systems for determining the air kerma rates of gamma radiation sources. Comparing the air kerma rates determined with the reference standard of the Calibration Laboratory of IPEN, a Farmer ionization chamber, with the values of the air kerma rates obtained with the graphite ionization chambers, the maximum differences obtained were only 1.7% and 1.2% for the G1 and G2 graphite ionization chambers, respectively. Moreover, these ionization chambers presented correction factors close to 1.000, which is ideal for an ionization chamber be characterized as a reference standard system. (author)

  3. Study of ceramics from circular archaeological sites of Amazonic Basin by geochemical methods: dating and characterization; Estudo de ceramicas de sitios arqueologicos circulares da Bacia Amazonica por meio de metodos geoquimicos: datacao e caracterizacao

    Energy Technology Data Exchange (ETDEWEB)

    Nicoli, Ieda Gomes

    2000-09-01

    The aim of this work is to examine by means of characterization and dating pottery recently discovery inside archaeological sites recognized with circular earth structure in Acre State - Brazil which may contribute to the research in the reconstruction of part of the pre-history of the Amazonic Basin. These sites are located mainly in the Hydrographic Basin of High Purus River. Three of them were strategic chosen which provide the ceramics: Lobao, in Sena Madureira County at north; Alto Alegre, in Rio Branco County at east and Xipamanu I, in Xapuri County at south. The X-ray diffraction mineral analysis made possible to identify two types of crystal structures of ceramic minerals: quartz and M-Kaolinite. Neutron activation analysis in conjunction with multivariate statistical methods were applied for the ceramic characterization and classification. An homogeneous group was established by all sherds collected from Alto Alegre and was distinct from all the other two groups analyzed. Some of the sherds collected from Xipamanu I appeared in Lobao's urns, probably because they had the same fabrication process. The Lobao's urns presented a homogeneous group. Geochronology of these materials was carried out by Thermoluminescence. The Xipamanu I was the oldest site and Lobao the youngest. The average age of Xipamanu I and Alto Alegre were 2600 and 2070 years respectively. The average age of of occupation was 400 years to Alto Alegre and 970 years to Xipamanu I. The most probably date for Lobao was 1880 years. (author)

  4. Researches, development and characterization of dosimetric materials for monitoring in irradiation processes with high doses; Pesquisa, desenvolvimento e caracterizacao de materiais dosimetricos para monitoramento em processos de irradiacao com doses altas

    Energy Technology Data Exchange (ETDEWEB)

    Galante, Ana Maria Sisti

    2003-07-01

    Dosimetric materials that can be produced in Brazil with material acquired in the national market to replace the imported dosimeters used in radiation processing were developed in this work. Mixtures of potassium nitrate and sensitizers compounds as manganese dioxide, barium nitrate and potassium bromide were prepared in the pellet form. Dosimetric characteristics such as dose-response useful range, sensitivity, environmental conditions and dose rate influences were evaluated in {sup 60}Co gamma radiation fields. Dyed polymethylmethacrylate detectors were also produced and its dosimetric characteristics were evaluated. The main characteristics evaluated in this case were: dose response useful range sensitivity, environmental conditions, dose rate influences and radiation energy dependence in gamma radiation fields and accelerated electrons beam of 0.8 to 1.5 MeV. The applied analytic technique was spectrophotometry. The calibration was performed in the irradiation facilities belonging to IPEN and certified by the International Atomic Energy Agency by means of the program IDAS (International Dose Assurance Service ) using the Fricke dosimeter. The mixture of potassium nitrate and manganese dioxide presented the best results and a wide dose range between 200 and 600 kGy. The response of the developed polymethylmethacrylate detectors are similar to the imported detectors and the dose range is characteristic to each detector and depends on the dye added in its formulation. (author)

  5. Synthesis and characterization of polyurethanes derived from cyclodextrins and poli (ethyleneglycol); Sintese, caracterizacao e avaliacao da capacidade de inclusao de poliuretanos derivados de cicodextrina e poli(etileno)glicol

    Energy Technology Data Exchange (ETDEWEB)

    Araujo, Marcia V.G. de; Vieira, Joao V.F.; Zawadzki, Sonia F., E-mail: zawadzki@ufpr.br [Universidade Federal do Parana - UFPR, Dept. de Quimica, Lab. de Polimeros Sinteticos (LABPOL), Curitiba, PR (Brazil)

    2011-07-01

    Cyclodextrins are natural cyclic oligosaccharides that have the ability to form inclusion complexes with various chemical species. In this work, the polymers with beta-cyclodextrin (BCD) or hydroxypropyl-beta-cyclodextrin (HPBCD) were synthesized from the reaction with poly (ethylene) glycol (PEG400, PEG1500, PEG4000) and diisocyanate, toluene 2,4 and 3,6 (TDI) in a solution of dimethylformamide (DMF). The polymers were characterized by infrared Fourier transform spectroscopy (FTIR), thermogravimetric analysis (TGA) and X-ray diffraction (XRD). The encapsulation capacity was evaluated by calorimetric method of discoloration of the alkaline solution of phenolphthalein. FTIR analysis revealed that assignments confirmed the formation of urethane linkages. TGA was evidenced by the mass loss in three stages and the evaluation results by XRD showed a crosslinking process. The evaluation of the encapsulation capacity of the units of the cyclodextrin crosslinked polymer showed that encapsulation increased proportionally to the mass of polymer used. (author)

  6. Characterization of TiO{sub 2} thin films obtained by metal-organic chemical vapour deposition; Caracterizacao de filmes finos de TiO{sub 2} obtidos por deposicao quimica em fase vapor

    Energy Technology Data Exchange (ETDEWEB)

    Carriel, Rodrigo Crociati

    2015-07-01

    Titanium dioxide (TiO{sub 2}) thin films were grown on silicon substrate (100) by MOCVD process (chemical deposition of organometallic vapor phase). The films were grown at 400, 500, 600 and 700 ° C in a conventional horizontal equipment. Titanium tetraisopropoxide was used as source of both oxygen and titanium. Nitrogen was used as carrier and purge gas. X-ray diffraction technique was used for the characterization of the crystalline structure. Scanning electron microscopy with field emission gun was used to evaluate the morphology and thickness of the films. The films grown at 400 and 500°C presented anatase phase. The film grown at 600ºC presented rutile besides anatase phase, while the film grown at 700°C showed, in addition to anatase and rutile, brookite phase. In order to evaluate the electrochemical behavior of the films cyclic voltammetry technique was used. The tests revealed that the TiO2 films formed exclusively by the anatase phase exhibit strong capacitive character. The anodic current peak is directly proportional to the square root of the scanning rate for films grown at 500ºC, suggesting that linear diffusion is the predominant mechanism of cations transport. It was observed that in the film grown during 60 minutes the Na+ ions intercalation and deintercalation easily. The films grown in the other conditions did not present the anodic current peak, although charge was accumulated in the film. (author)

  7. Characterization and zircon SHRIMP U-Pb geochronology of the subvolcanic rocks from Yarumalito Porphyry System, Marmato District, Colombia; Caracterizacao e geocronologia SHRIMP U-Pb em zircao das rochas subvulcanicas do sistema porfiro Yarumalito, Distrito de Marmato, Colombia

    Energy Technology Data Exchange (ETDEWEB)

    Henrichs, Isadora A.; Frantz, Jose Carlos; Marques, Juliana C.; Castoldi, Marco S., E-mail: isahenrichs@gmail.com, E-mail: jose.frantz@ufrgs.br, E-mail: juliana.marques@ufrgs.br [Universidade Federal do Rio Grande do Sul (UFRS), Porto Alegre, RS (Brazil). Instituto de Geociencias; Ordonez-Carmona, Oswaldo, E-mail: oswaldo.geologo@gmail.com [Universidad Nacional de Colombia, Medellin (Colombia). Facultad de Minas; Sato, Kei, E-mail: keisato@usp.br [Universidade de Sao Paulo (USP), Sao Paulo, SP (Brazil). Centro de Pesquisas Geocronologicas

    2014-09-15

    The mining District of Marmato, located in the Central Cordillera, is considered one of the oldest gold districts in Colombia and its exploration dates back to the Inca’s times, being exploited regularly for more than a thousand years. Inserted in this context lies the Yarumalito porphyry system (YPS), characterized to concentrate ore in structure related veins and stockworks. The YPS is related to the Miocene magmatism of the Combia Formation. In this paper, the subvolcanic rocks directly associated with the mineralized zones were described in order to obtain U-Pb ages in zircon to the intrusions. Selected samples from two fertile intrusions, one andesitic (more abundant in the area) and other dioritic (more restricted), were carefully described and dated by SHRIMP. The results points to a very restricted interval for the ages, with weighted average {sup 206}Pb/{sup 238}U varying from 7,00 ± 0,15 Ma for the andesitic porphyry and 6.95 ± 0.16 Ma for the dioritic porphyry. These results constrain the Yarumalito system to the final stages of the Combia magmatism and suggest a brief period for the crystallization of the mineralized subvolcanic rocks in the area and in the Marmato District. (author)

  8. Synthesis and characterization of ZSM-5 and calcined kaolin evaluation using the content of structure-directing; Sintese e caracterizacao da zeolita ZSM-5 utilizando caulim calcinado e avaliacao do teor de direcionador de estrutura

    Energy Technology Data Exchange (ETDEWEB)

    Rodrigues, J.J.; Silva, V.J. da; Rodrigues, M.G.F., E-mail: jocielys@yahoo.com.br [Universidade Federal de Campina Grande (LABNOV/UAEQ/UFCG), PB (Brazil). Unidade Academica de Engenharia Quimica. Lab. de Desenvolvimento de Novos Materiais

    2012-07-01

    This study aims to evaluate the effect of the structure-directing content, tetrapropylammonium bromide, on the structural and morphological characteristics of ZSM-5 zeolite obtained using calcined kaolin as silicon and aluminum. The samples were characterized by XRD, EDX, SEM and Physics Adsorption N{sub 2}. Trough X ray diffraction patterns was possible to observed the formation of the structure of ZSM-5 with intense peaks and well-defined characteristic of crystalline. The micrographs showed that the samples consist of agglomerates and/or aggregates of particles characteristic of the MFI structure typical of ZSM-5 zeolite. And through the adsorption-desorption isotherms physical N2 was possible to observe that the samples show hysteresis type I typical of microporous materials with specific surface areas of 218 and 222 m{sup 2}/g. Therefore, the use of calcined kaolin to obtain ZSM-5 zeolite was effective. (author)

  9. Synthesis and characterization of nanocomposites based on polyurethane in aqueous dispersions with non-modified hydrophilic clays; Sintese e caracterizacao de nanocompositos a base de poliuretanos em dispersoes aquosas com argilas hidrofilicas nao-modificadas

    Energy Technology Data Exchange (ETDEWEB)

    Miranda, G.S.; Delpechi, M.C.; Santo, W.L.E., E-mail: mcd@uerj.b [Universidade do Estado do Rio de Janeiro (UERJ), RJ (Brazil)

    2010-07-01

    Several studies involving the formation of polyurethane nanocomposites employing clays of montmorillonite modified. This involves the presence of quaternary ammonium salts, the cation exchange needed to increase the interlayer space of clays that incorporate more than one step to the process, generates a higher cost. In this paper the synthesis of nanocomposite polyurethanes dispersed in water allowed not only the production of materials less harmful to the environment, but also the incorporation of hydrophilic clays, calcium and sodium in nature, without any modifications. Dispersions produced from 0.5, 1.0 and 2.5% clay (on the mass of prepolymer) were characterized in terms of total solids content, the films obtained by casting were evaluated for adhesiveness, diffraction X-rays, scanning electron microscopy. Most systems showed intercalated and partially exfoliated structures. (author)

  10. Co-coagulation of the NBR latex and clay aqueous suspension: preparation and characterization;Co-coagulacao de latex de NBR e suspensao aquosa de argila: preparacao e caracterizacao

    Energy Technology Data Exchange (ETDEWEB)

    Reis, Raquel S.; Brum, Elisson; Silva, Vanessa M. [Nitriflex S/A Industria e Comercio, Rio de Janeiro, RJ (Brazil); Souza, Diego H.S.; Gomes, Ailton de S.; Nunes, Regina C.R., E-mail: rcnunes@ima.ufrj.b [Universidade Federal do Rio de Janeiro (IMA/UFRJ), RJ (Brazil). Inst. de Macromoleculas Profa. Eloisa Mano

    2009-07-01

    Blends of nitrile rubber (NBR) and sodium montmorillonite (MMT-Na) were prepared by co-coagulation of the NBR latex with aqueous suspension of clay. The content of MMT was varied from 0 to 7 phr and different mixtures were analyzed by X-ray diffraction, light scattering, gel content, thermogravimetric analysis and the oscillating disk rheometer. The different methods used indicated that there was formation of a structure interspersed in the mixtures studied, and that increasing the content MMT-Na enhances the values obtained. Rheological measurements on compositions with NBR showed the influence of clay on increasing the time of healing in terms of its content, as is the gel content and the thermal resistance. All results were compared to composition of NBR without MMT. (author)

  11. Production and characterization of self-reducing briquettes to be used as metallic charge at Companhia Siderurgica de Tubarao; Producao e caracterizacao de briquetes auto-redutores a serem utilizados como carga metalica na Companhia Siderurgica de Tubarao

    Energy Technology Data Exchange (ETDEWEB)

    Gama Bentes, Marcos A. da [Companhia Siderurgica de Tubarao (CST), Serra, ES (Brazil); Resende, Caio S.; D`Abreu, Jose C. [Pontificia Univ. Catolica do Rio de Janeiro, RJ (Brazil). Dept. de Ciencia dos Materiais e Metalurgia

    1996-12-31

    The present work investigates the initial steps for characterization and production of self-reducing briquettes to be manufactured from a mixture of residues, which are generated in the various industrial processes at Companhia Siderurgica de Tubarao. The main development consists of three main stages, encompassing the development and production of self-reducing briquette and the investigation of its reduction in both solid and liquid phases. The produced briquette can be used as an alternative metallic and recarburizing raw material to be charged in the converters, or substituting the cooling scrap added in the steel ladles. Furthermore, this material can be eventually be applied to the new developed technologies for iron and steel production. The results of briquetting agglomeration studies of various mixtures containing iron and carbon rich materials are presented, as well the metallization rates, which were obtained in the gas-solid reduction furnaces for the briquettes of different residue compositions. Finally, the liquid phase experiments to be carried out in a vacuum induction furnace are discussed. (author) 9 refs., 15 figs., 3 tabs.

  12. Methyl biodiesel from Dipteryx lacunifera: preparation, characterization and effect of antioxidant on the oxidation stability; Biodiesel metilico de Dipteryx lacunifera: preparacao, caracterizacao e efeito de antioxidantes na estabilidade a oxidacao

    Energy Technology Data Exchange (ETDEWEB)

    Araujo, Francisca Diana da Silva; Moura, Carla Veronica Rodarte de; Chaves, Mariana H., E-mail: mariana@ufpi.edu.b [Universidade Federal do Piaui (UFPI), Teresina, PI (Brazil). Dept. de Quimica

    2010-07-01

    The objective of this work was to study the potentialities of Dipteryx lacunifera Ducke seeds oil for biodiesel production. The yield in oil was of 46.11 {+-} 0.37%. Methyl biodiesel was prepared by base catalyzed transesterification yielding 88.13% and percentage conversion of triglycerides to corresponding methyl ester of 89.1%. The addition of the tertiary butylhydroquinone (TBHQ, 50 ppm), butylated hydroxytoluene (BHT, 50 ppm) and cashew nut shell liquid (CNSL, 2000 ppm) antioxidants in the biodiesel contributed to the increase of the induction period of 2.97 h for 8.08; 6.06 and 6.02 h, respectively. (author)

  13. Neutron field characterization in the installation for BNCT study in the IEA-R1 reactor; Caracterizacao do campo de neutrons na instalacao para estudo em BNCT no reator IEA-R1

    Energy Technology Data Exchange (ETDEWEB)

    Carneiro Junior, Valdeci

    2008-07-01

    This work aims to characterize the mixed neutron and gamma field, in the sample irradiation position, in a research installation for Boron Neutron Capture Therapy (BNCT), in the IPEN IEA-R1 reactor. The BNCT technique has been studied as a safe and selective option in the treatment of resistant cancerigenous tumors or considered non-curable by the conventional techniques, for example, the Glioblastoma Multiform - a brain cancerigenous tumor. Neutron flux measurements were carried out: thermal, resonance and fast, as well as neutron and gamma rays doses, in the sample position, using activation foils detectors and thermoluminescent dosimeters. For the determination of the neutron spectrum and intensity, a set of different threshold activation foils and gold foils covered and uncovered with cadmium irradiated in the installation was used, analyzed by a high Pure Germanium semiconductor detector, coupled to an electronic system suitable for gamma spectrometry. The results were processed with the SAND-BP code. The doses due to gamma and neutron rays were determined using thermoluminescent dosimeters TLD 400 and TLD 700 sensitive to gamma and TLD 600, sensitive to neutrons. The TLDs were selected and used for obtaining the calibration curves - dosimeter answer versus dose - from each of the TLD three types, which were necessary to calculate the doses due to neutron and gamma, in the sample position. The radiation field, in the sample irradiation position, was characterized flux for thermal neutrons of 1.39.10{sup 8} {+-} 0,12.10{sup 8} n/cm{sup 2}s the doses due to thermal neutrons are three times higher than those due to gamma radiation and confirm the reproducibility and consistency of the experimental findings obtained. Considering these results, the neutron field and gamma radiation showed to be appropriated for research in BNCT. (author)

  14. Characterization and standardized radiation qualities deployment - NBR IEC 61225 - in a animal irradiator; Caracterizacao e implantacao de qualidades de radiacao pradronizadas - NBR IEC 61225 - em um irradiador de animais

    Energy Technology Data Exchange (ETDEWEB)

    Carvalho, Samara; Magalhaes, Luis Alexandre Goncalves, E-mail: samaracarvalho@gmail.com [Universidade do Estado do Rio de Janeiro (LCR/UERJ), Rio de Janeiro, RJ (Brazil). Lab. de Ciencias Radiologicas; Pereira, Leslie [Instituto de Radioprotecao e Dosimetria (IRD/CNEN-RJ), Rio de Janeiro, RJ (Brazil)

    2015-07-01

    The present work consisted in the determination of additional aluminum filters, so that the Animal Irradiator of the Laboratory of Radiological Sciences-UERJ can operate in accordance with standard IEC 61267: 2005. In order to perform the measurements necessary for the determination of these filters, it was developed an additional filter positioning system coupled to the X-ray tube. The determination of these filters was performed to obtain the first half value layer (HVL) according to the window with the values given by the IEC 61267: 2005. It was used IPEN SRS-78 (Institute of Physics and Engineering in Medicine) software for the estimation of the total amount of the additional filtration through the measurements values of the first HVL. (author)

  15. Synthesis and characterization of Pt-Sn-Ni alloys to application as catalysts for direct ethanol fuel cells; Sintese e caracterizacao de ligas de Pt-Sn-Ni para aplicacao como caztalisadores em celulas a combustivel do tipo DEFC

    Energy Technology Data Exchange (ETDEWEB)

    Silva, E.L. da; Correa, P.S.; Oliveira, E.L. de; Takimi, A.S.; Malfatti, C.F., E-mail: celia.malfatti@ufrgs.b [Universidade Federal do Rio Grande do Sul (LAPEC/UFRGS), Porto Alegre, RS (Brazil). Programa de Pos-Graduacao em Engenharia Mecanica. Lab. de Pesquisa em Corrosao; Radtke, C. [Universidade Federal do Rio Grande do Sul (IQ/UFRGS), Porto Alegre, RS (Brazil). Inst. de Quimica

    2010-07-01

    Direct ethanol fuel cells (DEFCs) have been the focus of recent research due its application in mobile energy sources. In order to obtain the maximum efficiency from these systems, it is necessary the total ethanol oxidation, which implies in C-C bond break. Different catalysts described in literature are employed with this intent. This work consists in studying PtSnNi catalysts supported on carbon Vulcan XC72R, to application in DEFCs. Thus, it was used the impregnation/reduction method, varying the atomic proportion among Pt, Sn and Ni. The alloys were characterized by X-Ray Diffraction, Cyclic Voltammetry and Transmission Microscopy. Preliminary results show that predominant structure on the catalysts is the face centered cubic platinum and the densities currents are dependent on the platinum amount. (author)

  16. Methodology to characterize an unsampled oil interval, integrating PVT (Pressure/Volumen/Temperature) analysis and production log; Metodologia para caracterizacao de oleo de intervalo nao-amostrado, integrando analise PVT e perfil de producao

    Energy Technology Data Exchange (ETDEWEB)

    Marcon, Diogo Reato; Souza, Ana Paula Martins de; Vieira, Alexandre J.M. [PETROBRAS, Rio de Janeiro, RJ (Brazil)

    2008-07-01

    This work presents a new methodology for characterizing an unsampled oil interval, using basically production log data and PVT analyses available in the well. The methodology was applied to a real case, where the live oil samples were collected during a well test run in three different depths, revealing some evidence of a compositional grading due to gravity. Each individual sample was a mixture of the fluid produced from the reservoir bottom to the sampling point, since the whole interval was perforated and the isolation had to be made with a packer. The first sample was corresponding to the mixture of lower and all upper oils. The other two samples are only the heavier and that oil with part of the one from the upper interval. In order to identify the fluid properties from the upper interval, needed for production development studies, the following procedure was devised: equation-of-state tuning, reproducing the sampled fluid properties; conversion of volumetric flowrates from production log into mass and molar flowrates; flowrate ratio calculation, between the upper and lower intervals; upper interval fluid composition estimative; upper interval fluid properties simulation, using the previously tuned equation-of-state, thus generating what was considered a representative, synthetic PVT analysis. (author)

  17. Synthesis and characterization of sulfonic acid membranes based on interpenetrating polymer networks for application in fuel cells; Sintese e caracterizacao de membranas sulfonadas baseadas em redes polimericas interpenetrantes para aplicacao em celulas a combustivel

    Energy Technology Data Exchange (ETDEWEB)

    Blanco, Lyzed Toloza; Loureiro, Felipe A.M.; Rocco, Ana Maria [Grupo de Materiais Condutores e Energia, Escola de Quimica, Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil)], e-mail: amrocco@eq.ufrj.br; Pereira, Robson Pacheco [Instituto de Ciencias Exatas, Universidade Federal Fluminense (UFF), Volta Redonda, RJ (Brazil)

    2011-07-01

    In the present work, the synthesis and characterization of sulfonic membranes based on interpenetrating polymer networks (IPN). In order to obtain such systems, the diglycidyl ether of bisphenol A (DGEBA) was polymerized in presence of polyethyleneimine (PEI). These membranes were submitted to sulfonation reactions, originating IPN-SO{sub 3}H membranes. The characterization by FTIR evidenced the formation of a Semi-IPN structure, while sulfonation reactions resulted in systems containing -SO{sub 3}H groups covalently bonded to the chains. The membranes exhibited water retention up to 200 degree C, in a temperature range sufficient for application in PEMFC under hydration. (author)

  18. Aging and characterization of PVC compound used as flat-panel of a low cost solar collector; Envelhecimento e caracterizacao de compostos de PVC usado em placas de coletores solares de baixo custo

    Energy Technology Data Exchange (ETDEWEB)

    Prado, Bruna R.; Pinto, Tatiana T.; Bartoli, Julio R. [Depto. de Tecnologia de Polimeros, Faculdade de Engenharia Quimica/Universidade Estadual de Campinas. FEQ/UNICAMP, SP (Brazil)], e-mail: bartoli@feq.unicamp.br; Fernandes, Elizabeth G. [Tezca P and D Celulas Solares (Brazil)

    2011-07-01

    Regardless the excellent amount of solar irradiation in Brazil, the development and production of solar water heating systems did not reach the low-income families yet. The relatively high cost of conventional solar water heaters is still the main reason to prevent it. The development of a low cost solar water heater (around US$ 200), easy technology, was the scope of previous work. All-plastic solar collector prototypes were developed using unplasticized Poly (vinyl chloride) ceiling panels and tubes, commodities from building engineering. Nevertheless, the main thermal and photo degradation mechanisms for PVC are well known; the unusual application of PVC as solar collector materials should need a specific investigation on environmental aging. This work presents a study on outdoor aging and characterization of PVC flat-plate absorber of solar collectors after 5 years on use. (author)

  19. Study and characterization of dosimeter LiF:Mg,Cu,P for using in aeronautical dosimetry; Estudo e caracterizacao do dosimetro de LiF:Mg,Cu,P para utilizacao em dosimetria aeronautica

    Energy Technology Data Exchange (ETDEWEB)

    Flavia, Hanna, E-mail: hannasantana.f@gmail.com [Universidade Paulista (UNIP), Sao Jose dos Campos, SP (Brazil); Federico, Claudio; Lelis, Odair; Pereira, Heloisa; Pereira, Marlon, E-mail: claudiofederico@ieav.cta.br [Instituto de Estudos Avancados (EFA-A/IEAV), Sao Jose dos Campos, SP (Brazil). Div. de Fisica Aplicada

    2014-07-01

    The effects of cosmic ionizing radiation incidents in aircraft components and crews has been a source of concern and motivated increasingly studies and improvements in the area. The low dose rates involved in this radiation field in aircraft flight altitudes imply Dosimetric necessity of using materials with high efficiency of detection, to enable studies lower cumulative doses resulting in shorter routes or lower altitude. The choice of thermoluminescent dosimeters LiF: Mg, Cu, P was done by having a detection efficiency of about fifteen times higher than its predecessor (LiF: Mg, Ti), and therefore, applied in very low doses dosimetry, and environmental dosimetry . The implementation of the use of pair dosimetric TLD-600H and 700H-TLD will serve as support for testing and studies on the effects of low doses of cosmic radiation in environmental dosimetry applied in the aviation environment in the usual flight altitudes. In this paper are presented the results of development of a methodology for dosimetry low doses of gamma radiation and neutrons using the pair dosimetric TLD-600H and 700H-TLD. The results demonstrate a sensitivity of dosimeters well above the dosimeters LiF: Mg, Ti confirming its suitability for dosimetry of low doses.

  20. Polymeric membranes obtained from S-PEEK for application in PEM fuel cells; Caracterizacao de membranas polimericas obtidas a partir dos S-PEEK para aplicacao em celulas combustiveis do tipo PEM

    Energy Technology Data Exchange (ETDEWEB)

    Barreto, Ednardo G.; Fiuza, Raildo A.; Catao, Ronei S.; Jose, Nadia M.; Boaventura, Jaime S. [Universidade Federal da Bahia (UFBA), Salvador, BA (Brazil). Inst. de Quimica], e-mail: ednardobarreto@yahoo.com.br, e-mail: raildofiuza@gmail.com, e-mail: roneicatao@ig.com.br, e-mail: nadia@ufba.br, e-mail: bventura@ufba.br; Pepe, Yuri [Universidade Federal da Bahia (UFBA), Salvador, BA (Brazil). Inst. de Fisica

    2007-07-01

    This work had the objective to develop and to characterize S-PEEK membranes (sulfonated poly ether ether ketone) through chemical and electrochemical analyses. Conductivity test in function of the frequency and tension had been carried through; as well as, the open circuit tension of a fuel cell using the S-PEEK as electrolyte. Additional tests included TGA (Thermogravimetric Analysis), water absorption test, DSC (Differential Scanning Calorimetry), as tools to characterize conducting, thermal and mechanical proprieties of polymeric membrane. (author)

  1. Synthesis and characterization of a new complex binuclear of binuclear of Pd(II) containing the antibiotic oxy tetracycline; Sintese e caracterizacao de um novo complexo bimetalico de Pd(II) contendo o antibiotico oxitetraciclina

    Energy Technology Data Exchange (ETDEWEB)

    Guerra, Wendell, E-mail: wg@iqufu.ufu.b [Universidade Federal de Uberlandia (UFU), MG (Brazil). Inst. de Quimica; Fontes, Ana Paula Soares [Universidade Federal de Juiz de Fora (UFJF), MG (Brazil). Dept. de Quimica; Pereira-Maia, Elene Cristina [Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG (Brazil). Dept. de Quimica

    2010-07-01

    This article reports the synthesis and characterization of a new binuclear complex of palladium (II) containing the antibiotic oxytetracycline. The complex was characterized by the usual techniques of analysis. With respect to sites of coordination, the IR spectral data suggests the involvement the oxygen of the amide group and the oxygen of the neighbor hydroxyl group at ring A and to the carbonyl oxygen at C11 and the hydroxyl group at C12. (author)

  2. New routes of preparation of polyaniline films and dosimetric characterization for high-doses gamma radiation; Novas rotas de preparacao de filmes de polianilina e caracterizacao dosimetrica para radiacao gama em altas doses

    Energy Technology Data Exchange (ETDEWEB)

    Pacheco, Ana Paula Lima

    2003-08-15

    This work presents a new conducting polymeric material based on polyaniline thin films that will be used in the confection of dosimetric devices. On preparation of the films a homogeneous and viscous solution of poly (acrylic acid) and MnO{sub 2} is deposited on PMMA surface, which after dried, is immersed in an acid aniline solution. The films formed present low resistivity (6.10{sup 2} {omega}m), good mechanical resistance and adherence on the electrodes. The films were characterized by infrared spectroscopy, conductivity measurements and manganese elemental analyses. The resistance variations show linear correlation (r{sup 2} = 0,9928) with gamma irradiation dose in the range of 1000 to 6000 Gy, with medium error less than 5% and sensitivity response. The dosimetric devices present as advantage real time measurements, low cost, use in calibration of industrial radioactive sources. Moreover, this composite could in future replace Fricke dosimeter and its applications. A calibration curve is showed for PANI dosimeter, here proposed, to use at high gamma doses. (author)

  3. Technological characterization of basaltic rocks of Canoas I Hydroelectric Power Plant, Paranapanema river, Sao Paulo - Parana states, Brazil; Caracterizacao tecnologica das rochas basalticas da Usina Hidroeletrica Canoas I, Rio Paranapanema, SP/PR

    Energy Technology Data Exchange (ETDEWEB)

    Marrano, Antonio

    1997-07-01

    Basaltic litotypes from the rock mass foundation of Canoas I Hydroelectric Power Plant were submitted to technological characterization tests, in order to verify their suitability as construction material. Physical and mechanical properties (density, porosity, water absorption, ultrasonic velocity, compressive and splitting tensile strength, among others) were determined, besides petrographic analyses. Weather ability tests were also performed, not only through wetting-drying cycles and by immersion in ethylene glycol but by outdoor exposure as well, using crushed and core drilled specimens. Detailed procedures for the weather ability test using core specimens from rotary drilling are given. It is analyzed the influence of a geological feature (fault zone, about 10 meters thick and 20 degrees dip), that occurs in the rock mass foundation, on the technological properties of these rocks. Basaltic litotypes selected as construction material are then pointed out. (author)

  4. Study of characterization of trace elements in marine shells of Sambaqui: correlation between recent and old shells; Estudo de caracterizacao de elementos tracos em conchas marinhas de Sambaqui: correlacao entre conchas recentes e antigas

    Energy Technology Data Exchange (ETDEWEB)

    Gomez, Mauro Roger Batista Pousada; Rocha, Flavio Roberto; Silva, Paulo Sergio Cardoso da, E-mail: mauro_bpgomez@yahoo.com.br [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2013-07-01

    Calcium carbonate of recent and ancient C. rhizophorae oyster shells was analyzed for the determination of trace elements by instrumental neutron activation analysis. The ancient shells belong to a Sambaqui located in Cananeia region, South of Sao Paulo state and the recent ones are from an oyster production farm in the same region Studies related to the element concentrations in molluscs shell has been done as a tentative of establishing the element concentrations with palio-environmental factor. In this study it was aimed to verify differences in the elemental constitution of recent and ancient oyster shells that present potential for being used as indicator of marine changes. Results indicated that the elements Br, Ce, La, Na, Sm and An are higher in recent shells and the elements Cr, Fe Sc and Th are higher in ancient shells. Statistical analyses performed indicated that the enrichment of the light rare earth elements related to Ca are possibly good candidates for these palio-environmental studies. (author)

  5. Characterization of diesel oil mixtures with soy oil used for activation of engines of internal combustion; Caracterizacao de misturas de oleo diesel com oleo de soja reutilizado para acionamento de motores de combustao interna

    Energy Technology Data Exchange (ETDEWEB)

    Siqueira, Wagner da Cunha; Fernandes, Haroldo Carlos; Teixiera, Mauri Martins; Abrahao, Selma Alves; Leite, Daniel Mariano [Universidade de Vicosa, (DEA/UFV), MG (Brazil). Dept. de Engenharia Agricola], Emails: wagner.siqueira@ufv.br, haroldo@ufv.br, mauri@ufv.br, selma.abrahao@ufv.br, daniel.mariano@ufv.br

    2011-07-01

    Alternative energy sources have been studied in several countries, with emphasis on ways of obtaining and using more efficient. The objective of this work to evaluate and characterize mixtures of diesel oil (DO) with soybean oil reused (OSR), the ratios of 0, 25, 50, 75, and 100% of OSR in relation to specific gravity index viscosity and calorific value. To determine the specific gravity was used beaker, thermometer and a balance for each mixture was adjusted a regression model to estimate the bulk density as a function of temperature (25 to 90 deg C). We analyzed the viscosity of the mixtures using an orifice-type viscometer Saybolt, through regression analysis models were fit to estimate the viscosity as a function of temperature, heating the OSR 100% from 40 to 90 deg C decreased by up 90.4% to its viscosity. The tests were performed calorimetric using a bomb calorimeter determines the calorific value , the variation in calorific value followed a descending order with respect to OD with the increasing content of OSR. The OSR is efficient for use in internal combustion engines in small proportions. (author)

  6. Characterization of a Planetary Boundary Layer model to evaluate radionuclides releases in nuclear installations; Caracterizacao de um modelo de camada limite planetaria para avaliar liberacoes de radionuclideos em instalacoes nucleares

    Energy Technology Data Exchange (ETDEWEB)

    Molnary, Leslie de

    1993-07-01

    A two layer bulk model is used to simulate numerically the time and spatial evolution of concentration of radionuclides in the Planetary Boundary Layer (PBL) for convective and stable conditions. In this model, the closure hypothesis are based on the integrated version of the Turbulent Kinetics Energy (TKE) equation (Smeda,1979). This type of model was adopted here because it is numerically simple to be applied operationally in routine and emergency support systems of atmospheric releases at nuclear power plants, and the hypothesis of the efficiency of the vertical mixing seems to be physically reasonable to simulated PBL evolution for high wind conditions and stable conditions in Subtropical latitudes regions. In order to validate the model to the nuclear power plants of the Centro Experimental Aramar (CEA), located in Ipero, State of Sao Paulo, Brazil, numerical simulations were carried out with initial and boundary conditions based on vertical profiles of temperature and horizontal wind speed and direction obtained from tethered balloon soundings, synoptic charts at 850 hPa and surface observations. Comparisons between a 24 hour long numerical simulation and observations indicate that the model is capable of reproduce the diurnal evolution of temperature and horizontal wind during the convective regime. During stable conditions, the slab model was able to simulate the intensity of the surface inversion as a difference between the mixed layer and surface temperatures. The simulated mixed layer height matches with observations during the convective and stable regime. A daytime release of radionuclides was simulated for CEA region and the results indicated that the maximum relative concentration reaches a distance about 15 Km in 1 hour, varing from 100 times background at the moment of the release to 15 times the background. For night releases, the maximum concentration reaches the same distance in 45 minutes, varing from 100 to 30 times the background values. (author)

  7. Characterization of a free-air ionization chamber in direct X-ray beams as used in mammography; Caracterizacao de uma camara de ionizacao de ar-livre em feixes diretos de raios X utilizados em mamografia

    Energy Technology Data Exchange (ETDEWEB)

    Lima, Mateus Hilario de

    2014-08-01

    At this work stability and characterization tests were undertaken on a Victoreen free-air ionization chamber, model 481. The tests were realized using direct X-ray beams as a contribution for its establishment as a primary standard system of the quantity air kerma. The characterization tests were: saturation curve, ion collection efficiency, polarity effect, response linearity with the air kerma rate and response linearity with the chamber volume variation. The ion collection efficiency allowed the determination of the ion recombination factor. Most of the test results showed agreement with the limits established by international standards. Furthermore, the air attenuation factors for the mammography beams with aluminum and molybdenum filters were obtained. The factors for photon transmission and scattering at the diaphragm edges were also determined for mammography beams with aluminum filter and for the standard beam with molybdenum filter. (author)

  8. OSBRA right of way characterization in Vila Estrutural, Brasilia, Brazil; Caracterizacao de faixa do OSBRA na Vila Estrutural em Brasilia - evidencia de uma nova relacao da TRANSPETRO com a comunidade

    Energy Technology Data Exchange (ETDEWEB)

    Brito, Walderes Lima de; Castro, Newton Camelo de [TRANSPETRO - PETROBRAS Transporte S.A., Rio de Janeiro, RJ (Brazil); Braga, Gilberto Vieira [PETROBRAS S.A., Rio de Janeiro, RJ (Brazil)

    2005-07-01

    In this project we will introduce the relationship experience between TRANSPETRO and Vila Estrutural community, located in Guara, D.C., what we consider a social responsibility practice and an important tool of the integrity maintenance of right of way pipelines, considering the risks caused by other people actions. In this specific case, Vila Estrutural is the most critical one, of Sao Paulo - Brasilia pipelines (OSBRA): irregular occupations, with an estimated population by 25,000 people, with an inhabit strangle and development constructions tendency in the straight ahead direction of pipelines. To deal with this reality, OSBRA management created a strategy called 'Acquaintance Communication', increasing the knowledge about the community (diagnostic), promoting to yours employees an acquaintance culture (qualifying); developing communications strategies with those that live nearby right of the pipelines way (relationship); and finally, building the stonemason of the characterization of the right of way pipelines as a real device and right of the way protection (framing). This work is lined up with the idea of an integrated communication, using many strategies (visits, meetings, argument groups, etc.), constituting in a corporative social responsibility practice, admitting the community right of information and knowing it the right manner of living nearby the right of way pipeline, resulting in the equipment integrity, asserting the community safety and environment maintenance. (author)

  9. Dosimetry characterization of the commercial CaF{sub 2} for beta radiation of {sup 90}Sr + {sup 90}Y; Caracterizacao dosimetrica de CaF{sub 2} comercial para radiacao beta de {sup 90}Sr + {sup 90}Y

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Mercia L.; Caldas, Linda V.E. [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)], e-mail: mlolivei@ipen.br, e-mail: lcaldas@ipen.br

    2003-07-01

    This work studies the dosimetric characteristics of the CaF{sub 2} commercial dosimetry for detection of {sup 90}Sr + {sup 90}Y beta radiation for using in the calibration of flat and concave appliers. Were determined the repetitiousness and linearity of answers of the samples, and their calibration curves.

  10. Synthesis and characterization of particles derived of poly(vinyl alcohol) (PVA) for treatment of embolization and chemoembolization;Sintese e caracterizacao de particulas derivadas de poli(alcool vinilico) (PVA) para embolizacao e quimioembolizacao

    Energy Technology Data Exchange (ETDEWEB)

    Semenzim, Vinicius L.; Basso, Glaucia G.; Passos, Rodrigo A.; Nery, Jose G. [UNESP, Sao Jose do Rio Preto, SP (Brazil); Agreli, Guilherme; Oliveira, Ana P.M.L.; Kawasaki-Oyama, Rosa S.; Braile, Domingo M., E-mail: nery@ibilce.unesp.b [Braile Biomedica Industria e Comercio Representacoes S.A., Sao Jose do Rio Preto, SP (Brazil)

    2009-07-01

    The most effective way to treat cancerous tumors is by surgically removing them. However in some types of cancer, such as liver and uterine cancer, more than two-thirds of patients have no indication for surgery due to the size and location of the tumor, such as into the blood vessels. Doctors and researchers have invested in alternative and less invasive methods such as chemoembolization. The objectives of this research project are the synthesis and characterization of poly(vinyl alcohol) (PVA) particles for use in cancer treatment. PVA particles will be combined with chemotherapeutic agent Doxorubicin, drug commonly used in the treatment of cancers and carcinomas. The particles, obtained by controlled polymerization reaction followed by saponification, were characterized by SEM, XRD and NMR-CP/MAS. The functionalization of the particles with the drug is the next step of this study. (author)

  11. Development and characterization of two-component albedo based neutron individual monitoring system using thermoluminescent detectors; Desenvolvimento e caracterizacao de um sistema de monitoracao individual de neutrons tipo albedo de duas componentes usando detectores termoluminescentes

    Energy Technology Data Exchange (ETDEWEB)

    Martins, Marcelo Marques

    2008-07-01

    A TLD-albedo based two-component neutron individual monitoring system was developed and characterized in this work. The monitor consists of a black plastic holder, an incident neutron boron loaded shield, a moderator polyethylene body (to increase its response), two pairs of TLD-600 and TLD-700 (one pair to each component) and an adjustable belt. This monitoring system was calibrated in thermal neutron fields and in 70 keV, 144 keV, 565 keV, 1.2 MeV and 5 MeV monoenergetic neutron fields. In addition, it was calibrated in {sup 252C}f(D{sub 2}O), {sup 252}Cf, {sup 241}Am-B, {sup 241}Am-Be and {sup 238}Pu-Be source fields. For the latter, the lower detection levels are, respectively, 0.009 mSv, 0.06 mSv, 0.12 mSv, 0.09 mSv and 0.08 mSv. The participation in an international intercomparison sponsored by IAEA with simulated workplace fields validated the system. The monitoring system was successfully characterized in the ISO 21909 standard and in an IRD - the Brazilian Institute for Radioprotection and Dosimetry - technical regulation draft. Nowadays, the neutron individual system is in use by IRD for whole body individual monitoring of five institutions, which comprehend several activities. (author)

  12. Synthesis and characterization of Tin / Titanium mixed oxide nanoparticles doped with lanthanide for biomarking; Sintese e caracterizacao de nanoparticulas de oxido misto de estanho/titanio dopadas com lantanideos para marcacao biologica

    Energy Technology Data Exchange (ETDEWEB)

    Paganini, Paula Pinheiro

    2012-07-01

    This work presents the synthesis, characterization and photo luminescent study of tin and titanium mixed oxide nanoparticles doped with europium, terbium and neodymium to be used with luminescent markers on biological systems. The syntheses were done by co-precipitation, protein sol-gel and Pechini methods and the nanoparticles were characterized by infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy, X-ray diffraction and X-ray absorption spectroscopy. The photo luminescent properties studies were conducted for luminophores doped with europium, terbium and neodymium synthesized by coprecipitation method. For luminophore doped with europium it was possible to calculate the intensity parameters and quantum yield and it showed satisfactory results. In the case of biological system marking it was necessary the functionalization of these particles to allow them to bind to the biological part to be studied. So the nanoparticles were functionalized by microwave and Stoeber methods and characterized by infrared spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray diffraction obtaining qualitative response of functionalization efficacy. The ninhydrin spectroscopic method was used for quantification of luminophores functionalization. The photo luminescent studies of functionalized particles demonstrate the potential applying of these luminophores as luminescent markers. (author)

  13. Chemical and physicochemical characterization of vermicompost from bovine manure and evaluation of competitive adsorption of cadmium and lead; Caracterizacao quimica e fisico-quimica de vermicomposto de esterco bovino e avaliacao da adsorcao competitiva por cadmio e chumbo

    Energy Technology Data Exchange (ETDEWEB)

    Lamim, Soraida Sozzi Miguel [Juiz de Fora Univ., MG (Brazil). Dept. de Quimica; Jordao, Claudio Pereira; Brune, Walter; Pereira, Jose Luis [Vicosa Univ., MG (Brazil). Dept. de Quimica

    1996-09-01

    The chemical and physicochemical characterization of vermicompost from bovine manure has been studied. It was examined the pH and cation exchangeable capacity (CTC), moistness, ash, organic carbon, total nitrogen, lignin, cellulose and metal concentrations, among other characteristics. The vermicompost was then applied to the retention and competition of metal pollutants (Cd and Pb) from metal nitrate solutions. The retention was affected by both the pH and time of adsorption, while the competitive character of these metals for the substrate was not relevant to each pH examined. (author) 46 refs., 4 figs., 7 tabs.

  14. Characterization of jade and silicates of the jade family for application in radiation dosimetry; Caracterizacao do jade e dos silicatos da familia do jade para aplicacao em dosimetria das radiacoes

    Energy Technology Data Exchange (ETDEWEB)

    Melo, Adeilson Pessoa de

    2007-07-01

    The main dosimetric properties of jade and of Brazilian silicates of the jade family were studied for application in radiation dosimetry of high doses. Jade is a common denomination of two different silicates: jadeite, Na Al(Si{sub 2}O{sub 6}), and nephrite, Ca{sub 2}(Mg, Fe){sub 5}(Si{sub 4}O{sub 11}){sub 2} (OH){sub 2}, that belong to the subclasses of the pyroxenes and amphiboles respectively. The jade samples studied in this work were from: Austria, New Zealand, United States and Brazil. The Brazilian silicates of the jade family studied in this work were the amphiboles: tremolite,Ca{sub 2}Mg{sub 5}(Si{sub 4}O{sub 11}){sub 2}(OH){sub 2} e actinolite, Ca{sub 2}Fe{sub 5}(Si{sub 4}O{sub 11}){sub 2}(OH){sub 2}; and the pyroxenes: rhodonite, MnSiO{sub 3} and diopside, Ca Mg(Si{sub 2}O{sub 6}). The mineralogical and chemical composition of these materials were obtained using the neutron activation analysis and X-ray diffraction techniques. The main dosimetric properties (emission curves, calibration curves, reproducibility, lower detection limits, angular and energy dependence, etc) were studied using the thermoluminescent (T L), thermally stimulated exo-emission (TSEE) and electronic paramagnetic resonance (EPR) techniques. The jade-Teflon and the silicate-Teflon samples present two T L peaks around 115 deg C (peak 1) and 210 deg C (peak 2). The calibration curves of the studied materials present a linear behaviour between 0.5 Gy and 1 kGy. The TSEE emission peak occurs at 240 deg C for all samples, and the calibration curves present a sub linear behaviour between 100 Gy and 20 kGy. In the case of the EPR technique, only jade USA has a potential application for radiation dosimetry. A static computational simulation of the most probable intrinsic and extrinsic defects in rhodonite was also realized. Among the basic defects, the Schottky defects of rhodonite are the most probable to occur and, among the extrinsic defects, the divalent and trivalent dopants present the best possibility of inclusion in rhodonite. (author)

  15. Characterization of raw materials to obtain the mass for white ware, using waste glass; Caracterizacao de materiais-primas visando a obtencao de massas para ceramica branca, utilizando residuos de vidro plano

    Energy Technology Data Exchange (ETDEWEB)

    Cavalcanti, M.S.L. [Universidade Federal de Campina Grande (CCT/UFCG), PB (Brazil). Centro de Ciencias e Tecnologia; Porto, V.S.; Meneses, R.L; Albuquerque, A.V.; Guedes, B.F.R.; Morais, C.R.S.; Santana, L.N.L. [Universidade Federal de Campina Grande (CCT/UFCG), PB (Brazil). Centro de Ciencias e Tecnologia. Unidade Academica de Engenharia de Materiais

    2009-07-01

    A major problem faced in the post modern society is the huge amount of glass, accumulated in landfills cities. The glass material is one hundred percent recyclable and has the property to act as fluxes as well as feldspar. Given this premise, this study aimed to characterize materials - raw materials and waste glass regional plan for development of ceramic bodies with the similar behavior produced industrially, using shards of glass to partially replace the feldspar. The materials - raw materials used were clay, ball clay, kaolin, quartz, feldspar and shard of glass, being characterized by the techniques: chemical analysis, size analysis, differential thermal analysis vibrational spectroscopy in the infrared region, the Ray-Diffraction X and scanning electron microscopy. The results showed that the waste had higher rates of vitreous oxides fluxes and similar. (author)

  16. Synthesis and characterization of poly(methyl methacrylate-co-vinyl acetate) and its evaluation as filtrate reducer; Sintese e caracterizacao de poli(metacrilato de metila-co-acetato de vinila) e sua avaliacao como redutor de filtrado

    Energy Technology Data Exchange (ETDEWEB)

    Nunes, Rita de Cassia P.; Pires, Renata V.; Segtovich, Iuri V.; Lucas, Elizabete F. [Universidade Federal do Rio de Janeiro, Instituto de Macromoleculas, Laboratorio de Macromoleculas e Coloides na Industria de Petroleo, (UFRJ), RJ (Brazil)], e-mail: repires@ima.ufrj.br

    2011-07-01

    The drilling of petroleum well is extremely important and requires the use of suitable drilling fluids in order to ensure an efficient operation without causing rock damage. Specific polymers have been used in controlling infiltration during drilling, ensuring the operation success. In this work, spherical microparticles of poly(methyl methacrylate-co-vinyl acetate) (PMMA-VAc), prepared by suspension polymerization, were evaluated in terms of their performance in controlling filtrate loss of aqueous fluids. A filter press test with ceramic disc, simulating the rock, was used. The performance of the synthesized materials was compared to that of commercial polymers. It was observed that the performance of the material is directly associated to the relation between particle size and pore size of rock specimen. Furthermore, when the particle size is suitable, the rubbery characteristic of the material produces a more efficient filter cake, for filtrate control. (author)

  17. Synthesis and characterization of pigments of hematite, obtained through a by-product of the siderurgy industry; Sintese e caracterizacao de pigmento de hematita, obtido atraves de um subproduto da industria siderurgica

    Energy Technology Data Exchange (ETDEWEB)

    Prim, S.R.; Folgueiras, M.V.; Lima, M.A. de, E-mail: dem6srp@joinville.udesc.b [Universidade Estadual de Santa Catarina (PGCEM/UDESC), Joinville, SC (Brazil). Programa de Pos-Graduacao em Ciencia e Engenharia de Materiais

    2009-07-01

    In the ceramic industry of tooting, whose selection is strongly influenced by the visual aspect of the decorated surface, the color becomes one of the most important characteristic for the too tings. With the purpose of seeking new pigments that replace or optimize the already known, news method to synthesis are being researched, such as new pigments system and also the incorporation of new raw materials. In this form, in the present work search to study the possibility of use of a by-product deriving from of the siderurgical industry, that introduces high grades of the Fe{sub 2}O{sub 3}. For that different contests of the residue were added in one matrix of silica in the hape of quartz, and homogenized using conventional milling and high energy milling. The material obtained after heating treatment in temperature that varied between 1050 and 1300 deg C was characterization by x-ray diffractometry, differential thermal analysis and scanning electron microscopy. The results shown the feasibility of the process depend of the control of the variables temperature and condition of milling in the quality of material obtained. (author)

  18. The role of inversion for acoustic impedance in the seismic characterization process of reservoirs; O papel da inversao para a impedancia acustica no processo de caracterizacao sismica de reservatorios

    Energy Technology Data Exchange (ETDEWEB)

    Sancevero, Sergio Sacani; Remacre, Armando Zaupa; Portugal, Rodrigo de Souza [Dept. de Geologia e Recursos Naturais (DGRN), Inst. de Geociencias, Universidade Estadual de Campinas (UNICAMP), SP (Brazil)], E-mails: sacani@ige.unicamp.br, armando@ige.unicamp.br, portugal@ige.unicamp.br

    2006-10-15

    The reservoir characterization process can be defined as the three-dimensional and quantitative determination of structure and petrophysical properties of the oil field. The use of 3D seismic data in the reservoir characterization process has become more frequent mainly in the identification of the shape and the size of the sand bodies that constitute the reservoir. However, in some situations as the deep water turbidity reservoirs of Campos Basin, that are characterized by a complex distribution of sand bodies and sub seismic thickness, the use of the conventional seismic amplitude data can result in serious mistakes in the definition of reservoir model. To solve the problem of the vertical seismic resolution limitation, is necessary to build an integrated model that use all information available about the reservoir. The most effective way to integrate the seismic data in the reservoir characterization process is by using acoustic impedance models, obtained by seismic inversion. The aim of this work is to show how the seismic inversion to acoustic impedance can support and improve the characterization of the reservoirs, when comparing the results obtained by the application of two seismic inversion methods, the recursive inversion and the constrained sparse-spike inversion. The seismic inversion methods are applied in a wedge synthetic reference model, that represent some features find in the deep water turbidity reservoir, like stratigraphic thinning and pinch-outs. Based on these results we can see the advantages in use the seismic inversion methods in the determination of geometry of sand bodies and in the calculation of petrophysical properties, and as a consequence more accuracy models can be generated and the forecasts about the behavior of the field can be done in most effective way. (author)

  19. Physicochemical characterization of sludge obtained in a UASB reactor: influence on the energetic utilization in the pyrolysis process; Caracterizacao fisico-quimica de lodo obtido em um reator UASB: influencia no aproveitamento energetico em processo de pirolise

    Energy Technology Data Exchange (ETDEWEB)

    Carvalho, Murillo Barros de [Universidade Federal do Tocantins (UFT), Palmas, TO (Brazil)], Email: murillopur@yahoo.com.br; Vieira, Glaucia Eliza Gama; Cardoso, Aderlanio da Silva; Silveira, Dyego Amaral; Figueiredo, Radson Lima [Universidade Federal do Tocantins (LEDBIO/UFT), Palmas, TO (Brazil). Lab. de Ensaios e Desenvolvimento de Biomassas e Biocombustiveis

    2010-07-01

    In biological treatment processes of domestic sewer it leaves of the organic matter is converted and another is absorbed being part of the microbial biomass denominated generic of mud biological or secondary composed mainly of biological solids, and that for that reason can also be denominated of sewage sludge. To give a maintainable final destiny for that residue has been one of the great challenges of the sanitation in the last years. Great part of that material is destined unproductive some are incinerated, others are disposed in sanitary embankments. This work had as objective the physiochemical characterization of the digested sludge, virgin and free from oxide of calcium (CaO), produced in the reactor UASB, of ETE Vila Uniao located in the city of Palmas-TO, for the destination as raw material for energy use in pyrolysis process. The collected sample was taken drought and stabilized to be analyzed at the laboratory LEDBIO/UFT where they were studied the particle, tenor of ashes, humidity and volatile density and sequential extraction for soxhlet. Found in the biomass loud tenor of volatile (56,72%), carbon fastens low (5,21%) and a considerable tenor of ashes (32,78%), what suggests that that sludge, in agreement with the comparisons of the literature, can obtain good incomes in pyrolysis process, especially incomes in bio-oil and coal. (author)

  20. Technological characterization of a mineral deposit. A case study: the niobium of Catalao I, Goias State, Brazil; Caracterizacao tecnologica de um deposito mineral. Um estudo de caso: o niobio de Catalao I, Goias

    Energy Technology Data Exchange (ETDEWEB)

    Sant`Agostino, Lilia Mascarenhas

    1996-12-31

    This thesis presents a contribution to the subject of ore technological characterization integrated to orebody context, regarding sample, ore characteristics, ore types definition and distribution through the mineral occurrence, and ore reserves modeling using technological parameters. A professional experience in this specialization based a conceptual discussion of the matter, supported by a practical approach. The initial approach is the subject definition, and it`s importance for technological and economical feasibility studies, in all phases of mining research and development, as a tool for beneficiation alternatives definition. The multidisciplinary aspect of the knowledge involved for ore characterization is remarked, considering that is an interface segment to be conduced interactively with others. It is an applied mineralogy, that needs some geological and some ore dressing imputes. After the general considerations about importance and applicability, it follows a methodological approach of laboratory procedures and analytical techniques, as a result of practical experience acquired in the study of several ores. The main points discussed are related with criterion to organized laboratory preparation scheme and to select appropriated analytical techniques, without detailing them, for what some specialized bibliography is indicated. Finalizing the theoretical explanation, there is a concise description about computers resources for 3D orebody modeling, and integrated software applied for geology and mining. For illustration, it is exposed a complex ore case study: niobium mineralization associated with the alkaline-carbonatitic occurrence of Catalao I, located in Goias State, Brazil. Besides the explanation of laboratory procedures and methods applied, results treatment and interpretation are emphasized, under both characterization and economic point of view. (author) 135 refs., 57 figs., 38 tabs.

  1. Synthesis and characterization of rare earth molybdates nanoparticles for detection of specific prostatic cancer (PSA); Preparacao e caracterizacao de nanoparticulas de molibdatos de terras raras para deteccao do antigeno especifico da prostata (PSA)

    Energy Technology Data Exchange (ETDEWEB)

    Dias, Clarissa Lombardi

    2013-07-01

    The interest in using rare earths to investigate the properties and functions of biochemical systems as well as to determinate biological substances has increased in several fields, including biomarkers in immunology (fluoro immunoassays). Nowadays the use of lanthanides in the diagnosis of various diseases have become more important through the development of commercial diagnostic kits. As main feature, these rare earths can show a long lifetime, photo stability and emission bands of atomic like behavior and well defined, in the visible region, demonstrating unique advantages when compared to other luminescent species. The present work had as its goal to synthesize rare earth molybdates by the co-precipitation method as well as to characterize these materials by X-ray diffraction, near infrared spectroscopy, thermogravimetric analysis, scanning electronic microscopy, transmission electronic microscopy and luminescent studies. In this work, three different studied were developed: the influence of the vortex speed variation during co-precipitation in the structure of the final product, morphology and luminescence properties; the influence of the annealing temperature also in the structure, morphology and luminescence properties; and the influence of concentration of the doping in the luminescence properties. Another important step of this work was the functionalization of nanoparticles using an organosilane (APTES) to coat and establish points for binding the particles to biological species. It was proved that this process was very efficient by the characterization results and the silica incorporation was well succeeded. Specific prostatic cancer (PSA) was then linked to the functionalized nanoparticles to diagnostic prostatic cancer by fluoroimmunoassay and levels for detection were established. (author)

  2. Electrothermal and microstructural characterization of varistors ceramics used in high-voltage surge arresters; Caracterizacao eletrotermica e microestrutural de ceramicas varistoras utilizadas em para-raios de altas tensoes

    Energy Technology Data Exchange (ETDEWEB)

    Barbosa, Flavio Bittencourt; Furtado, Jose G. de Melo [Centro de Pesquisas de Energia Eletrica (CEPEL), Rio de Janeiro, RJ (Brazil); Nobrega, Maria C. de S. [Universidade Federal do Rio de Janeiro (COPPE/UFRJ), RJ (Brazil). Coordenacao dos Programas de Pos-Graduacao de Engenharia

    2008-07-01

    In this work is studied the electrothermal behavior of varistor ceramic blocks used in high voltage surge arresters of transmission and distribution lines, relating this behavior to microstructural characteristics of the studied varistor ceramics. We studied blocks of zinc oxide varistors with nominal voltage of 4.0 kV, by and voltage-capacitance characterization curves, reference voltage test, impulse residual voltage, polarization tests and induced degradation tests. On the other hand, the microstructural characterization was made by scanning electron microscopy and energy-dispersive spectroscopy. The obtained results allow to correlate the behavior of the resistive component of the leakage current with the microstructural characteristics of the studied varistors, specially in pre-breakdown region. (author)

  3. Synthesis and characterization of cement slurries additives with epoxy resins - kinetics, thermodynamic and calorimetric analysis; Sintese e caracterizacao de pastas de cimento aditivadas com resinas epoxi - analises cineticas, termodinamicas e calorimetricas

    Energy Technology Data Exchange (ETDEWEB)

    Tavares, A.M.G.; Andrade Junior, M.A.S.; Cestari, A.R.; Vieira, E.F.S., E-mail: macleybiane@gmail.co [Universidade Federal de Sergipe (UFS), Sao Cristovao, SE (Brazil)

    2010-07-01

    Cement has been used in the world, presenting a wide versatility. However, due to its chemical nature, it is subject to several types of chemical damages, especially for agents of acidic nature. With the purpose of increase its life-time, new cement slurries have been modified with the addition of specific additives. The objective of this work is to modify cement slurries with epoxy resins, which promote higher resistance of those materials in relation to acid attacks. Three cement slurries were synthesized with epoxy resins and a standard slurries, which was composed by cement and water. After 30 days of hydration, the samples were characterized by XDR, FTIR and thermal analysis (TG and DSC). The hydration processes of the cement slurries were studied by heat-conduction microcalorimetry. A kinetic study of HCl interaction with the new slurries were performed by the batch methodology at 25, 35, 45 e 55 deg C. It was verified that the addition of the polymers delayed the processes of hydration of the slurries, decreasing the flow of heat released as a function of the amount of added resin and, increased the resistance of those slurries to the acid attack. (author)

  4. The geomechanical characterization of the rocky mass foundation of the Tijuco Alto hydroelectric power plant, Ribeira River, Sao Paulo/Parana States, Brazil; Caracterizacao geomecanica do Macico de Fundacao da UHE Tijuco Alto (Rio Ribeira - SP/PR)

    Energy Technology Data Exchange (ETDEWEB)

    Figueiredo, Amarilis Lucia Casteli de

    1996-07-01

    This work has as its main objective the geomechanical characterization on the future rocky mass foundation of the Tijuco Alto dam, sited at the Ribeira river, in the cities of Ribeirao, Sao Paulo state and Adrianopolis, Parana state, Brazil, owned by the Companhia Brasileira de Aluminio (Brazilian company of Aluminium). To reach that target, field studies were made to qualify the geotechnical parameters of the rocky mass, in the axis area open galleries. It was also used in situ deformability and stress test results performed in those galleries, that were reinterpreted for a better adaptation of the mass values. The knowledge of the mass inherent characteristics together with the laboratories test results, allowed for the geomechanical classification applications in several different gallery sectors. The geomechanical data obtained allowed through mathematical expressions, to reach the rocky mass values correlations of interest to the work (deformability and strength), that could be compared to the in situ test results. That analysis permitted, besides the classification critical system evaluation, the geomechanical characterization of the rocky mass, focusing its ability to the dam arch construction. (author)

  5. Bee waxes: a model of characterization for using as base simulator tissue in teletherapy with photons; Ceras de abelha: um modelo de caracterizacao para sua utilizacao como tecido simulador base em teleterapia com fotons

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Rogerio Matias Vidal da; Souza, Divanizia do Nascimento

    2011-10-26

    This paper presents a model of characterization and selection of bee waxes which makes possible to certify the usage viability of that base simulator tissue in the manufacture of appropriated objects for external radiotherapy with mega volt photon beams. The work was divide into three stages, where was evaluated physical and chemical properties besides the aspects related to the capacity of beam attenuation. All the process was carefully accompanied related to the wax origin such as the bee specimen and the flora surrounding the beehives. The chemical composition of the waxes is similar to others simulators usually used in radiotherapy. The behavior of mass attenuation coefficient in the radiotherapeutic energy range is comparable to other simulators, and consequently to the soft tissue. The proposed model is efficient and allows the affirmative that the usage of determined bee wax as base simulator tissue is convenient

  6. Preliminary characterization of the rare earth ore from the Barra do Itapirapua, Sao Paulo and Parana states, Brazil. Detail 1 area; Caracterizacao preliminar do minerio de terras raras da Barra do Itapirapua, SP/PR - area de detalhe 1

    Energy Technology Data Exchange (ETDEWEB)

    Lorenzi, M.L.B.; Lorenzi, V.E.; Kahn, H

    1996-12-31

    The main rare earth mineralization on Barra do Itapirapua Alkaline-Carbonatitic Complex is related to the weathering mantle of the Serrana Body carbonatite plug - detail 1 area. The present work describes the preliminary RE ore types established from correlation between geological observations, geochemical weathering profile and mineralogical studies. Mineralogical studies, comprising around 40 thin section analysis, were performed by scanning electron microscopy (SEM) with energy dispersive systems (EDS). (author) 5 refs., 2 figs., 1 tab.

  7. Characterization and study of the behavior of wire Ti-Ni with shape memory effect enables manufacture of actuators; Estudo da caracterizacao e do comportamento de fios de Ti-Ni com efeito memoria de forma viabilizando fabricacao de atuadores

    Energy Technology Data Exchange (ETDEWEB)

    Pina, E.A.C.; Araujo Filho, O.O. de; Urtiga Filho, S.L.; Gonzalez, C.H., E-mail: kikipina@hotmail.co [Universidade Federal de Pernambuco (DEM/CTG/UFPE), Recife, PE (Brazil). Centro de Tecnologia e Geociencias. Dept. de Engenharia Mecanica

    2010-07-01

    This work aims to characterize the wire commercial Ti-Ni of 1.27 mm in diameter with shape memory effect for the development of helical springs with the function of sensor / actuator. After heat treatment, the transformation temperatures, the presence of precipitates, the degree of damping, maximum stress of rupture, modulus of elasticity, the presence of phase R, the behavior of the alloy under tension, will be analyzed and compared in each situation. For characterization we used several methods including: heat treatment, Differential Scanning Calorimetry (DSC), tensile, dynamic mechanical analysis (DMA), X-ray diffraction, thermomechanical cycling. The wires were cut into pieces and heat-treated at 400 deg C with variation of time in muffle furnaces and quenching in water at 25 deg C. (author)

  8. Microstructural characterization of porous titanium foams using gamma-ray transmission and X-ray microtomography techniques; Caracterizacao microestrutural de espumas porosas de titanio atraves das tecnicas de transmissao de raios gama e microtomografia de raios X

    Energy Technology Data Exchange (ETDEWEB)

    Moreira, Anderson C.; Appoloni, Carlos R., E-mail: sandersoncamargo@yahoo.com.b, E-mail: appoloni@uel.b [Universidade Estadual de Londrina (UEL), PR (Brazil). Dept. de Fisica; Oliveira, Marize V. [Instituto Nacional de Tecnologia (INT), Rio de Janeiro, RJ (Brazil); Fernandes, Celso P., E-mail: celso@lmpt.ufsc.b [Universidade Federal de Santa Catarina (UFSC), Florianopolis (Brazil). Dept. de Engenharia Mecanica. Lab. de Meios Porosos e Propriedades Termofisicas

    2007-07-01

    The study of porous materials with various applications, for example in medicine, in the petroleum industry, in metallurgy, and others, has been receiving special attention of the scientific community. This has led to the increase of research related to different techniques for structural characterization of these materials. In the present work, three samples of titanium foam have been analysed by gamma-ray transmission (GRT), and two from the samples have also been analysed by X-ray microtomography. The samples structurally characterized in this work have surgical applications for treating bone diseases and orthopaedic traumas. The experimental array for GRT included an automated micrometric table for sample moving, Am-241 source (59.53 keV, 100 mCi), 2 mm diameter collimators, NaI(Tl) detector and adequate nuclear electronics. For the X-ray microtomography technique, the experimental configuration included a SkysCan 1172 with an X-ray tube (20-100kV e 0-250 muA), a 10Mpixel CCD detector (4000x2300) and a system for moving the samples; the detector allows an image resolution of 0.8 mum. The images generated by the microtomographic system were analysed using IMAGO. This software allows the determination of geometric parameters of the material such as pore size distribution, total porosity, and self-correlation function for the tridimensional reconstruction of the sample to be used in computer simulations. Porosity data for sample Ti-1, obtained from both techniques, were in good agreement. The total average porosities determined, by gamma transmission, for each of the three samples, were: phi{sub 1}=53.47 +- 0.36%, phi{sub 2}=55.95 +- 0.3% and phi{sub 3}=56.80 +- 0.56%, and the one determined by X-ray microtomography was phi{sub 1}=53.47 +- 0.36%. The pore size distribution for the T-1 sample, by X-ray microtomography, showed that 57% of the porous phase has pore sizes ranging from 20-80 mum

  9. Characterization of Amazon fibers of the peach palm, balsa, and babassu by XDR, TGA and NMR; Caracterizacao das fibras amazonicas de pupunha, babacu e balsa atraves de DRX, TG e RMN

    Energy Technology Data Exchange (ETDEWEB)

    Martins, Maria A.; Marconcini, Jose M., E-mail: mariaalice@cnpdia.embrapa.br [Embrapa Instrumentacao, Sao Carlos-SP (Brazil); Morelli, Carolina L.; Marinelli, Alessandra L.; Bretas, Rosario E.S. [Universidade Federal de Sao Carlos - UFSCar, Sao Carlos, SP (Brazil)

    2011-07-01

    The aim of this work was to present the results by testing X-ray diffraction (XRD), thermogravimetric analysis (TG), nuclear magnetic resonance (NMR) and determining the moisture content of the peach palm, balsa and babassu fibers for assessing the feasibility of composite materials. The fibers of peach palm, balsa and babassu showed characteristic chemical structure of lignocellulosic material, and good thermal stability up to 220 deg C. The fiber with the highest crystallinity index (Ic) is the peach palm (72%) and the less crystalline is the babassu (37%), while the balsa fibers have Ic equal to 64%. The results have shown that these fibers can be used in the manufacture of composite materials. (author)

  10. {sup 1}H-NMR characterization of cellulose acetate obtained from sugarcane bagasse; Caracterizacao de acetato de celulose obtido a partir do bagaco de cana-de-acucar por {sup 1}H-RMN

    Energy Technology Data Exchange (ETDEWEB)

    Cerqueira, Daniel A., E-mail: daniel.cerqueira@ufba.b [Universidade Federal da Bahia (UFBA), Salvador, BA (Brazil). Inst. de Ciencias Ambientais e Desenvolvimento Sustentavel; Rodrigues Filho, Guimes [Universidade Federal de Uberlandia (UFU), MG (Brazil). Inst. de Quimica; Carvalho, Rui de A. [Universidade de Coimbra (Portugal). Dept. de Bioquimica; Valente, Artur J.M. [Universidade de Coimbra (Portugal). Dept. de Quimica

    2010-07-01

    Cellulose from sugarcane bagasse was used for synthesizing cellulose acetate with different degrees of substitution, which were characterized by {sup 1}H-NMR through the relationship between the peak areas of the hydrogen atoms of the acetate groups (-(C=O)OCH{sub 3}) and the peaks of the hydrogen bonded to the carbon atoms of the glycosidic rings. Suppression of some signals was carried out in order to remove the residual water resonance in the materials and those related to impurities in cellulose triacetate as well. A deconvolution method for the computation of the degree of substitution of acetylation is proposed. The degrees of substitution for the cellulose samples were 2.94 and 2.60, in good agreement with those obtained by chemical determination through an acid-base titration. (author)

  11. Synthesis and characterization of chitosan-graft-poly(acrylic acid)/rice husk ash hydrogels composites; Sintese e caracterizacao de hidrogeis compositos de cinza da casca de arroz e quitosana enxertada com poli(acido acrilico)

    Energy Technology Data Exchange (ETDEWEB)

    Rodrigues, Francisco H.A. [Universidade Estadual Vale do Acarau - UVA, Sobral, CE (Brazil); Lopes, Gabriel V.; Pereira, Antonio G.B.; Fajardo, Andre R.; Muniz, Edvani C. [Universidade Estadual de Maringa - UEM, PR (Brazil)

    2011-07-01

    According to environmental concerns, super absorbent hydrogel composites were synthesized based on rice husk ash (RHA), an industrial waste, and Chitosan-graft-poly(acrylic acid). The WAXS and FTIR data confirmed the syntheses of hydrogel composites. The effect of crystalline or amorphous RHA on water uptake was investigated. It was found that the RHA in crystalline form induces higher water capacity (W{sub eq}) of composites hydrogels due to the fact that the intra-interactions among silanol groups on RHA make available new sites in the polymer matrix, which could interact to water. (author)

  12. Preparation and characterization of polymer blends based on recycled PET and polyester derived by terephthalic acid; Preparacao e caracterizacao de blendas polimericas a base de PET reciclado e poliester derivado do acido tereftalico

    Energy Technology Data Exchange (ETDEWEB)

    Ohara, L.; Miranda, C.S.; Fiuza, R.P.; Luporini, S.; Carvalho, R.F.; Jose, N.M., E-mail: leandro.ohara@gmail.co [Universidade Federal da Bahia (GECIM/UFBA), Salvador, BA (Brazil). Inst. de Quimica. Grupo de Energia e Ciencias dos Materiais

    2010-07-01

    Environmentally friendly materials, made from industrial waste, are being increasingly used as a solution to the growing amount of waste generated by society, but also as a cheaper alternative to replace conventional materials for use in construction. In this work were investigated the properties of polymer blends based on recycled PET and a polyester derived from terephthalic acid and glycerin, a co-product of biodiesel. The samples were characterized by XRD, TGA, DSC, FTIR and SEM. The polyester synthesized showed a degradation event near 300 deg C. The blends with higher ratio of PET showed thermal behavior similar to pure PET. The X-ray diffraction showed that the polymer blends are semicrystalline materials. The micrographs presents the presence of a smooth surface, indicating the possibility of miscibility between the arrays. Therefore, the blending makes possible the fabrication of low-cost materials with applications in several areas. (author)

  13. Characterization of cellulose acetate obtained from sugarcane bagasse by {sup 1}H-NMR; Caracterizacao de acetato de celulose obtido a partir do bagaco de cana-de-acucar por {sup 1}H-RMN

    Energy Technology Data Exchange (ETDEWEB)

    Cerqueira, Daniel A.; Rodrigues Filho, Guimes, E-mail: d.a.cerqueira@gmail.co [Universidade Federal de Uberlendia (IQ/UFU), MG (Brazil). Inst. de Quimica; Carvalho, Rui A. [Universidade de Coimbra (UC) (Portugal). Dept. de Bioquimica; Valente, Artur J.M. [Universidade de Coimbra (UC) (Portugal). Dept. de Quimica

    2009-07-01

    Cellulose from sugarcane bagasse was used for synthesizing cellulose acetate with different degrees of substitution, which were characterized by {sup 1}H-NMR through the relationship between the peak areas of the hydrogen atoms present at the acetate groups (-(C=O)OCH{sub 3} ) and the peaks of the hydrogen bonded to the carbon atoms of the glycosidic rings. Suppression was carried out in order to remove the peak of residual water in the materials and the peak related to impurities in cellulose triacetate. Degree of substitution values obtained through the resonance deconvolution were compared to those obtained by chemical determination through an acid-base titration. The determined degrees of substitution of the cellulose samples were 2.94 and 2.60. (author)

  14. Hardness and microstructural characterization of API 5L X70 steel pipes welded by HF/ERW process; Caracterizacao microestrutural e de dureza em tubos de aco API 5L X70 soldados pelo processo HF/ERW

    Energy Technology Data Exchange (ETDEWEB)

    Calcada, Mauricio Vieira; Voorwald, Herman Jacobus Cornelis; Nascimento, Marcelino Pereira do [UNESP, Guaratingueta, SP (Brazil). Faculdade de Engenharia

    2010-07-01

    The materials that stand in the manufacture of steel pipes are called API, that should have, high mechanical resistance, high corrosion resistance, high fatigue resistance, good weldability, and other properties. Thus, the purpose of this project was to evaluate the microstructure and hardness of welded joints by the HF/ERW process of API 5L X70 steel pipes. The microstructural analysis was performed using a surface finish with grit sizes from 220 to 25 {mu}m e polishing with diamond paste from 9 {mu}m to 0.05 {mu}m; the revelation was made with 3% Nital attack. The Vickers hardness was performed across the welded joint by 33 points to indentation. The results were: 80.5 {+-} 3.4% of ferrite and 19.5 {+-} 3.4% of perlite for microanalysis. As for hardness, the values were: 215.69 HV10 for weld line, 218.65 HV10 for ZTA and 218.95 HV10 for base metal. (author)

  15. Preparation and physico-chemical characterization of inclusion complexes between local anesthetics and hydroxypropyl-{beta}-cyclodextrin; Preparacao e caracterizacao fisico-quimica de complexos de inclusao entre anestesicos locais e hidroxipropil-{beta}-ciclodextrina

    Energy Technology Data Exchange (ETDEWEB)

    Moraes, Carolina Morales; Abrami, Priscila; Goncalves, Marcos Moises; Andreo Filho, Newton [Universidade de Sorocaba, SP (Brazil); Fernandes, Sergio Antonio; Paula, Eneida de [Universidade Estadual de Campinas (UNICAMP), SP (Brazil). Inst. de Biologia. Dept. de Bioquimica; Fraceto, Leonardo Fernandes [UNESP, Sorocaba, SP (Brazil). Dept. de Engenharia Ambiental]. E-mail: leonardo@sorocaba.unesp.br

    2007-07-15

    S(-) Bupivacaine (S(-)BVC) and Lidocaine (LDC) are widely used local anesthetics (LA). Hydroxypropyl {beta}-cyclodextrin (HP-{beta}-CD) is used as a drug-carrier system. The aim of this work was to characterize inclusion complexes between LA and HP-{beta}-CD. The affinity constants determined at different pHs show favourable complexation. The release kinetics experiments showed that S(-)BVC and LDC changed the released profiles in the presence of HP-{beta}-CD. Nuclear magnetic resonance experiments gave information about the interaction between LA and the cyclodextrin cavity. This study focused on the physicochemical characterization of drug-delivery formulations that come out as potentially new therapeutic options for pain treatment. (author)

  16. Structural and morphological characterization of TiO{sub 2} powders prepared using Pechini and combustion reaction; Caracterizacao estrutural e morfologica de nanopos de TiO{sub 2} preparados pelo metodo Pechini e por reacao de combustao

    Energy Technology Data Exchange (ETDEWEB)

    Ribeiro, P.C.; Almeida, E.P.; Costa, A.C.F.M. da; Lira, H.L., E-mail: pollyanacae@yahoo.com.b [Universidade Federal de Campina Grande (UFCG), PB (Brazil). Dept. de Engenharia de Materiais; Kiminami, R.H.G.A. [Universidade Federal de Sao Carlos (UFSCar), SP (Brazil). Dept. de Engenharia de Materiais

    2010-07-01

    TiO{sub 2} is a semiconductor oxide and polymorphic and can exist in three crystallographic forms: anatase, rutile and broquita, and forms anatase and rutile are the major interests in scientific research. Thus, this study aims to synthesize TiO{sub 2} by Pechini methods and combustion reaction and to evaluate the influence of synthesis methods in structural and morphological characteristics of the samples. The nanopowders were characterized by X-ray diffraction, nitrogen adsorption, and particle size distribution and scanning electron microscopy. The results of X-ray diffraction showed that the samples obtained by the Pechini method showed the single phase anatase with crystallite size of 20 nm and surface area of 49.44 m{sup 2}/g, whereas the samples synthesized by combustion reaction using glycine as fuel showed the rutile phase as major phase and traces of anatase phase, with crystallite size of 65 nm and surface area 4.34 m{sup 2}/g. (author)

  17. Incorporation of metals (Pt-Ni-Ru) in the zeolite ZSM-5 through ion exchange competitive: synthesis and characterization; Incorporacao de metais (Pt-Ni-Ru) na zeolita ZSM-5 atraves da troca ionica competitiva: sintese e caracterizacao

    Energy Technology Data Exchange (ETDEWEB)

    Barbosa, A.S.; Rodrigues, M.G.F., E-mail: antusiasb@hotmail.com [Universidade Federal de Campina Grande (UFCG), PB (Brazil). Departamento de Engenharia Quimica; Grau, J.M. [Instituto de Investigaciones en Catalisis y Petroquimica (INCAPE/FIQ/UNL-CONICET), Santa Fe (Argentina)

    2012-07-01

    Zeolites are very important materials due to their high specific surface area. Moreover, they are suitable for use as catalyst support. Noble metals supported on zeolites have been widely used as catalysts in the petrochemical industry. This paper was prepared and characterized, a powder aiming its use in heterogeneous catalysis. Support was used as ZSM-5 and the method of incorporation of the metals (Ru-PtNi) was competitive ion exchange. The materials (ZSM-5 and Pt-Ni-Ru/ZSM-5) were characterized by spectrophotometry Energy Dispersive X-ray (EDX), X-Ray Diffraction (XRD) and nitrogen physisorption (BET method). Based on the results of X-ray diffraction, it is possible to demonstrate the preservation of the structure of zeolite ZSM-5 after the competitive ion Exchange with metals (Ru-Pt-Ni) and calcination. The dispersion of metals on ZSM-5 did not change the textural characteristics of the zeolite. (author)

  18. Microstructural characterization of industrial foams by gamma ray transmission and X-ray microtomography; Caracterizacao microestrutural de espumas industriais por transmissao de raios gama e microtomografia de raios X

    Energy Technology Data Exchange (ETDEWEB)

    Rodrigues, Luiz Eduardo

    2004-07-01

    This work presents the total porosity measurements of the aluminum and silicon carbide (SiC) foams samples. For porosity determination the gamma ray transmission and X-ray microtomography with conic beam techniques were used. These methods have more advantage than conventional ones, because they are non destructive and provide more details of the analyzed material porous structure. The aluminum foam samples with 10, 20, 30, 40 and 45 ppi (pores per inch) and SiC ceramic foam samples with 20, 30, 45, 60, 75, 80 and 90 ppi were analysed by gamma transmission. The SiC 60, 75 and 90 ppi samples were also analyzed by X-ray microtomography. For the gamma ray transmission measurements it was used an {sup 241} Am source (59.53 keV), a NaI(Tl) scintillation detector, collimators, a XYZ micrometric table and standard gamma spectrometry electronics connected to a multichannel analyzer, at the LFNA/UEL. For the X-ray microtomographic measurements, the Fein Focus X-ray system of the Nuclear Instrumentation Laboratory of the COPPE, located at the Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, was used. This equipment provide us images with micrometric resolution (53.48 {mu}m) using a conic X-ray beam and bidimensional detection. The microtomographic images were pre-processed and analyzed by the Imago software, developed at Porous Media and Materials Thermophysical Properties Laboratory (LMPT) of the Mechanical Engineering Department, located at Universidade Federal de Santa Catarina, Florianopolis, SC. Employing the The Imago software it was calculated the total porosity, pore size distribution and autocorrelation function C(u) of the binarized microtomographic images of the each sample. The microtomographic 3-D image of each sample was compared with 3-D image reconstructed by the Gaussian truncated method. This method generates a periodic 3-D porous structure by using of the autocorrelation function of one 2-D cross sectional image of the sample. (author)

  19. Microstructural characterization of porous materials by X-ray microtomography and gamma ray transmission techniques; Caracterizacao da microestrutura de materiais porosos por microtomografia de raios X e transmissao de raios gama

    Energy Technology Data Exchange (ETDEWEB)

    Moreira, Anderson Camargo

    2006-07-01

    This work presents the application of the X-ray microtomography and gamma ray transmission techniques for the microstructure characterization of different kinds of materials. Total porosity, pore size distribution and the two point correlation functions were measured. The two point correlation function, which allows the reconstruction of 3D models, was carried out for two samples. Seven ceramic tablets of Alumina (Al{sub 2}O{sub 3}), seven tablets of Boron Carbide (B{sub 4}C), three samples of sedimentary rocks and one sample of Titanium foam were analyzed. The experimental set up for the Gamma Ray Transmission technique consisted of: a 2'' x 2'' crystal NaI(Tl) detector, an {sup 241} Am radioactive source (59,53 keV, 100 mCi), an automatic micrometric table for the sample XZ movement and standard gamma spectrometry electronics. Two microtomography systems were used: a Fein Focus system, constituted by an X-ray tube, operated at 160 kV and 0.3 to 1.1 mA, a CCD camera and the movement sample system, and a Skyscan system, model 1072, with a X-ray tube operated at 100 kV and 100{mu}A, and a CCD camera. The ceramic tablets, analyzed by the gamma ray transmission technique presented results for most of the porosities data with smaller confidence intervals and inside the intervals supplied by the tablets manufacturer. The Titanium porous sample was analyzed by the two techniques, its microtomography images achieved a resolution of 17{mu}m, obtained employing the Fein Focus system. For both techniques, this sample showed high porosity, which allows its application for this purpose. The sandstones samples were analyzed by the Skyscan system, achieving resolutions of 19{mu}m, 11{mu}m and 3.8{mu}m for each sample, respectively. The resolutions of 11{mu}m and 3.8{mu}m were the ones that generated better 2D sections for the respective samples and, consequently, more reliable porosities. The 3.8{mu}m resolution was the one that best quantified the pore size distribution data, showing information not shown by the 11{mu}m resolution, showing that pores with 15 to 45{mu}m radius are predominant, constituting 57% of the porous phase of this sample, and 1 % are just constituted by pores with radius up to 3.8{mu}m. These results show that resolution better than 3.8{mu}m could be necessary only for specific cases. (author)

  20. Physical-chemical properties of the gasoline-ethanol flex-fuel by infrared adsorption spectroscopy; Caracterizacao fisico-quimica do combustivel flexivel (gasolina + AEHC) por espectroscopia de infravermelho

    Energy Technology Data Exchange (ETDEWEB)

    Pires, Camila Reis; Araujo, Antonio Sousa de [Universidade Federal do Rio Grande do Norte, Natal, RN (Brazil). Dept. de Quimica. Lab. de Combustiveis e Lubrificantes

    2004-07-01

    Gasoline and ethanol are the components studied in the Flex-Fuel technology, in order to provide an innovative and alternative new option of vehicular fuel. To determine their conformity, these fuels were previously analyzed according to the following ANP regulations: density, alcoholic tenor, octane number and distillation. In order to obtain Flex-Fuel samples, the proportions of 20, 40, 60 and 80 vol% of alcohol in gasoline were mixed and homogenized. The obtained mixtures were submitted to the same analysis for evaluation of the physical-chemical behavior. The physical-chemical characterization of the Flex-Fuel was carried out by infrared spectroscopy, using an equipment Fuel Analyzer, manufactured by Petrospec model GS1000, in agreement with the MB 457, D 2700, D2699 rules, and the obtained data: MON (motor method), RON (method researches), and IAD were compared to the results of a type 'C' gasoline. In this work, infrared (IR) absorption spectroscopy showed to be a good tool to readily estimate the octane number of gasoline-ethanol fuel. From IR spectroscopy, was established a method to derive the octane number from the intensities of absorption bands related to methyl, methylene and aromatic compounds, by considering the absorption groups with C-H stretching vibration. According to the Flex-Fuel technology, the obtained results showed that the addition of moisturized ethanol increases the octane number, for instance, for each 5% of alcohol in gasoline an increase of ca. 2% in the octane was observed. (author)

  1. 3D geostatistic modelling of the acoustic impedance for the characterization of Namorado oil field, Brazil; Modelagem geoestatistica 3D da impedancia acustica para a caracterizacao do Campo de Namorado

    Energy Technology Data Exchange (ETDEWEB)

    Vidal, Alexandre Campane; Sancevero, Sergio Sacani; Remacre, Armando Zaupa; Costanzo, Caetano Pontes [UNICAMP, Instituto de Geociencias, Dept. de Geologia e Recursos Naturais, Campinas, SP (Brazil)], E-mails: vidal@ige.unicamp.br, sacani@ige.unicamp.br, geden@ige.unicamp.br, caetano.costanzo@gmail.com

    2007-07-15

    The aim of this work is analyze the vertical seismic resolution of the turbidity reservoir of Namorado Field. In this work the seismic modeling was accomplished using the convolution method. The wavelet used was the Ricker type with dominant frequency of 20 hz, 35 hz and 50 hz. The results show that wavelet with frequencies of 35 hz and 50 hz have better seismic resolution than wavelets of 20 hz, however all frequencies delimit top and base of the reservoir. From the acoustic impedance model, obtained from the synthetic seismogram, was possible, knowing the correlation of this variable with reservoir rocks, determine the distribution of reservoir facies. For that was used the geostatistical analysis that still enabled the studies regarding to the scenarios analysis by means of the application of stochastic methods. (author)

  2. Impregnation of 12-tungstophosphoric acid on silica - part I: determination of impregnation parameters, characterization and evaluation of catalytic activity; Impregnacao do acido 12-fosfotungstico em silica - parte I: determinacao de parametros de impregnacao, caracterizacao e avaliacao da atividade catalitica

    Energy Technology Data Exchange (ETDEWEB)

    Scroccaro, Karine Isabel; Tanobe, Valcineide Oliveira de Andrade; Cocco, Lilian Cristina; Yamamoto, Carlos Itsuo, E-mail: karineisabel@yahoo.com.br [Universidade Federal do Parana, Curitiba, PR (Brazil). Centro Politecnico. Dept. de Engenharia Quimica; Wypych, Fernando [Universidade Federal do Parana, Curitiba, PR (Brazil). Centro Politecnico. Dept. de Quimica

    2012-07-01

    Catalyst based on Kegging-type heteropolyacids (H{sub 3}PW{sub 12}O{sub 40} - HPA), supported on SiO{sub 2} (H{sub 3}PW), were prepared by the impregnation method under different thermal treatment conditions. The materials were characterized by different instrumental techniques and used as catalysts in the methyl esterification reactions of stearic acid. Using the catalyst with 15% of HPA, conversions higher than 60% were obtained after 2 h of reaction at 65 deg C. Recovery studies using hot-filtration with ethanol at 75 deg C showed satisfactory activity for two additional reaction cycles. (author)

  3. Characterization of Maytenus ilicifolia samples by {sup 1}H NMR relaxation in the solid state; Caracterizacao dos constituintes polimericos da Maytenus ilicifolia por relaxacao nuclear de {sup 1}H por RMN no estado solido

    Energy Technology Data Exchange (ETDEWEB)

    Preto, Monica S. de M.; Tavares, Maria I.B., E-mail: mibt@ima.ufrj.br [Universidade Federal do Rio de Janeiro (IMA/UFRJ), RJ (Brazil). Inst. de Macromoleculas Professora Eloisa Mano. Lab de Ressonancia Magnetica Nuclear; Sebastiao, Pedro J.O. [Departamento de Fisica, Instituto Superior Tecnico, Lisboa (Portugal)

    2011-07-01

    The Maytenus ilicifolia (espinheira-santa) is a popular medicinal plant with different uses. It is native of South America and can be found in Brazil. In the Brazilian market it is possible found products labeled as M. ilicifolia. So far, the studies published in the literature involve the modification of the natural materials and do not concern the comparison between commercial the raw natural materials. Different non-destructive NMR techniques can be used to study natural materials. In this work it is presented a characterization study by Fast Field Cycling of the {sup 1}H spin-lattice relaxation time (T{sub 1}) NMR, in the frequency range 100 khz-10 MHz. The results obtained in two commercial M. ilicifolia samples and one control sample collected in natura are compared. It was intended to study the possibility to elaborate a characterization method using FFCNMR suitable for the verification of authenticity and/or evaluation of tampering on products. The differences detected by FFCNMR relaxometry were confirmed by thermogravimetric analysis and infrared spectroscopy. (author)

  4. Preparation of EVA/silica nano composites characterized with solid state nuclear magnetic resonance; Obtencao de nanocomposito de EVA/SILICA e caracterizacao por ressonancia magnetica nuclear no estado solido

    Energy Technology Data Exchange (ETDEWEB)

    Passos, Adriano A.; Tavares, Maria I.B.; Neto, Roberto C.P.; Moreira, Leonardo A.; Ferreira, Antonio G., E-mail: mibt@ima.ufrj.br [Centro de Tecnologia, Instituto de Macromoleculas Professora Eloisa Mano, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ (Brazil)

    2011-07-01

    Nano composites of poly(ethylene-co-vinyl acetate)/silica (SiO{sub 2}) with dimensions of ca. 40 nm were prepared via solution intercalation employing chloroform as a solvent. They were mainly characterized with nuclear magnetic resonance spectroscopy (NMR) employing carbon-13 (polymeric matrix), silicon-29 (nanoparticles) and through the determination of the proton spin-lattice relaxation time in the rotating frame (T{sub 1{rho}H}) (polymer matrix). From the NMR results it was inferred that up to 5% of silica in mass a well dispersed nano composite was obtained, owing to a strong interaction between silica and the EVA matrix. (author)

  5. Preparation and characterization of high density polyethylene and residual fibre of Attalea funifera Mart (piacava) composites; Preparacao e caracterizacao de compositos de polietileno de alta densidade com residuos de fibras de piacava da especie Attalea funifera Mart

    Energy Technology Data Exchange (ETDEWEB)

    Agrela, Sara P.; Guimaraes, Danilo H.; Jose, Nadia M., E-mail: saraagrela@hotmail.co [Universidade Federal da Bahia (GECIM/IQ/UFBA), Salvador, BA (Brazil). Inst. de Quimica. Grupo de Energia e Ciencias dos Materiais; Carvalho, Gleidson G.P. [Universidade Federal da Bahia (UFBA), Salvador, BA (Brazil). Escola de Medicina Veterinaria. Dept. de Producao Animal; Carvalho, Ricardo F. [Universidade Federal da Bahia (EP/UFBA), Salvador, BA (Brazil). Escola Politecnica. Curso de Mestrado em Engenharia Ambiental Urbana

    2009-07-01

    The use of natural fiber reinforcement thermoplastic polymer is continuously increasing. This fact is manly due to its advantages as low cost, availability, recyclability, low energy demand and then environmental appeal if compared to synthetics fibers. The composites were prepared in different fiber volume ratios (5%, 10% and 20%) mixed with high density polyethylene (HDPE) and heated at 190 deg C. Thermogravimetric analysis and differential scanning calorimetry were used to investigate thermal stability. The composites structure was characterized by Fourier Transform Infrared spectroscopy, X-ray diffractometry. Fiber and residue of piassava (Attalea funifera Mart) chemical composition were determined by Van Soest Method. The results indicate that thermo stability of the composites of HDPE prepared with fiber volume ratios up to 20% is only slightly lowered. (author)

  6. Hemocyte characterization of Nasutitermes coxipoensis (Holmgren) (Isoptera: Termitidae) workers and hemocyte evaluation after parasitism by Metarhizium anisopliae; Caracterizacao dos hemocitos de operarios de Nasutitermes coxipoensis (Holmgren) (Isoptera: Termitidae) e avaliacao hemocitaria apos parasitismo por Metarhizium anisopliae

    Energy Technology Data Exchange (ETDEWEB)

    Cunha, Franklin M.; Wanderley-Teixeira, Valeria; Albuquerque, Auristela C. [Universidade Federal Rural de Pernambuco (UFRPE), Recife, PE (Brazil). Programa de Pos-Graduacao em Entomologia Agricola], e-mail: ukento@yahoo.com.br; Teixeira, Alvaro A.C. [Universidade Federal Rural de Pernambuco (UFRPE), Recife, PE (Brazil). Dept. de Morfologia e Fisiologia Animal], e-mail: valeria@dmfa.ufrpe.br, e-mail: auritermes@yahoo.com.br; Alves, Luiz C. [Universidade Federal de Pernambuco (UFPE), Recife, PE (Brazil). Lab. de Imunopatologia Keizo Asami (LIKA); Lima, Elza A.L.A. [Universidade Federal de Pernambuco (UFPE), Recife, PE (Brazil). Dept. de Micologia. Lab. de Controle Biologico

    2009-03-15

    We aimed to characterize the morphology and ultrastructure of hemocytes of Nasutitermes coxipoensis (Holmgren) workers and to quantify the cell types 24h, 48h and 72h after inoculation with Metarhizium anisopliae. Six hemocytes types were identified, plasmatocyte, granulocyte, spherulocyte, prohemocyte, adipohemocyte and eonocytoid Hemocytes did not present any morphological alteration at the several observation periods, but they did have a change in their abundance, as observed for spherulocytes, adipohemocytes and eonocytoids at all intervals, and for plasmatocytes and granulocytes at 48h after host inoculation. We argue on the possible reasons and implications of the observed changes. (author)

  7. Technological characterization of clays from the city of Anapolis. Goias, Brazil, for the usage in ceramic products; Caracterizacao tecnologica de argilas do municipio de Anapolis, Goias, Brasil, para a utilizacao em produtos ceramicos

    Energy Technology Data Exchange (ETDEWEB)

    Chrispim, Z.M.P.; Alves, M.G.; Ramos, I.S.; Silva, A.L.; Fraga, F.A., E-mail: lezira@ig.com.b [Universidade Estadual do Norte Fluminense Darcy Ribeiro (LECIV/CCT/UENF), Campos dos Goytacazes, RJ (Brazil). Engenharia Civil; Almeida, L.L.P. de [Universidade Estadual do Norte Fluminense Darcy Ribeiro (LAMAV/CCT/UENF), Campos dos Goytacazes, RJ (Brazil). Lab. de Materiais Avancados

    2010-07-01

    The city of Annapolis is located 48 kilometers from the capital, Goiania, in Goias Center Mesorregion, which forms part of the Annapolis-Brasilia-Goiania axis, with an economy focused on manufacturing industry, pharmaceuticals, ceramics, wholesale and automobile industry, having a population of 335, 960 inhabitants (IBGE, 2009). The objective of this work is the physical and mineralogical characterization of three samples of clay of that region. The clays were characterized by granulometry determining distribution, Atterberg limits, chemical composition, X-ray diffraction and differential thermal analysis and thermogravimetry. Samples (cps) were obtained by extrusion and fired at 750 deg, 950 deg and 1050 deg C. After the burning process it was determined the water absorption, bending rupture's modulus. The analyzed results show the physical and mineralogical composition of raw materials and concluded that this characterization allows to estimate that the three samples are appropriate or not for the production of ceramic products.(author)

  8. Synthesis and characterization of YIG (Y{sub 3}Fe{sub 5}O{sub 12}); Sintese e Caracterizacao do YIG (Y{sub 3}Fe{sub 5}O{sub 12})

    Energy Technology Data Exchange (ETDEWEB)

    Fernandes, T.S.M.; Silva, M.A.S. da; Simao, S.H.C; Sombra, A.S.B., E-mail: supersainara@yahoo.com.br [Universidade Federal do Ceara (UFC), Fortaleza, CE (Brazil); Sales, J.C. [Universidade Estadual Vale do Acarau (UVA), Sobral, CE (Brazil)

    2012-07-01

    The objective of this work is to study the formation of the ceramic material YIG (Y{sub 3}Fe{sub 5}O{sub 12}) calcined in three types of calcining temperature and measurement by X-ray of powder calcined. The YIG was prepared by the conventional solid state method on a high-energy mill planetary (Fritsch Pulverisette 5), using amounts of Stoichiometric of the Y{sub 2}O{sub 3} (Aldrich 99%) and Fe{sub 2}O{sub 3} (Merck 99%), which were the dried milled for 1h at 370 rpm (revolutions per minute). The milled powder was calcined in a resistive furnace at 1100 ° C, 1200 ° C and 1300 ° C for 5h. The measuring of X-rays was done using the calcined powders. The refinement showed that YIG is formed without the presence of secondary phases in all the temperatures tested, the Scherrer equation showed that the samples have a small particle size.

  9. Synthesis and characterization of ceramics BNO (BiNbO4) added to 10% of CuO; Sintese e caracterizacao da ceramica BNO (BiNBO{sub 4}) adicionada com 10% de CuO

    Energy Technology Data Exchange (ETDEWEB)

    Sales, A.J.M.; Silva, P.M.O.; Rodrigues Junior, C.A., E-mail: jeffsales.brasil@gmail.com [Universidade Federal do Ceara (DETI/UFC), Fortaleza, CE (Brazil). Dept. de Teleinformatica; Sales, J.C.; Silva, M.A.S. da [Universidade Estadual Vale do Acarau (UVA), Sobral, CE (Brazil); Sombra, A.S.B. [Universidade Federal do Ceara (LOCEM/UFC), Fortaleza, CE (Brazil). Dept. de Fisica. Lab. de Telecomunicacoes e Ciencias e Engenharia de Materiais

    2012-07-01

    The study of the synthesis and structural characterization of ceramic BiNbO4 and behavior of density when added 10% by weight of CuO, with a view to applications in ceramic capacitors, are presented in this work. The BiNbO4 was prepared by conventional ceramic method. The milled powders were calcined for 2 hours at 850 °C for 3 hours and characterized by using a diffractometer Rigaku DMAXB of Co-α radiation. A more detailed characterization by XRD was performed using the program DBWS9807a using the Rietveld refinement of crystal structures, which confirmed the achievement of the α-BNO phase with orthorhombic structure. Were produced buks with the calcined powder, they were sintered at 925 °C. In order to study the grain morphology and distribution of pores in the ceramic body, the surface of the sample by adding 10% of CuO was analyzed by Scanning Electron Microscopy which confirmed a better densification. (author)

  10. Characterization of the oligosaccharide structure of human glycosylated prolactin (G-hPRL) native and recombinant; Caracterizacao da estrutura oligossacaridica de prolactina glicosilada humana (G-hPRL) nativa e recombinante

    Energy Technology Data Exchange (ETDEWEB)

    Marcos Vinicius Nucci Capone

    2013-07-01

    Human prolactin (hPRL) is a polypeptide hormone secreted by the anterior pituitary under the regulation of the hypothalamus, involved in a variety of biological processes such as mammary gland development and lactation. The recombinant product is important in medical diagnosis and treatment of failure of lactation. This hormone may occur in the form of non-glycosylated protein (NGhPRL) and glycosylated (G-hPRL) with molecular weights of approximately 23 and 25 kilodalton (kDa), respectively; has a single N-glycosylation site located at asparagine (Asn) position 31, which is partially occupied, thus being a particularly interesting model of glycosylation. The biological activity of G-hPRL is lower compared to NG-hPRL (~4 times) and its physiological function is not well defined: the portion of carbohydrate appears to have an important role in the hormone biosynthesis, secretion, biological activity, and plasma survival of the hormone. The main objective of this study was to compare the structures of N-glycans present in glycosylated pituitary prolactin (G-hPRL-NHPP) with those present in the recombinant. To obtain the recombinant G-hPRL the production was performed in laboratory scale from Chinese hamster ovary cells (CHO), genetically modified and adapted to growth in suspension. Cycloheximide (CHX), whose main effect was to increase the ratio G-hPRL/NG-hPRL from 5% to 38% was added to the culture medium, thereby facilitating the purification of G-hPRL. The G-hPRL was purified in two steps, a cation exchanger followed by a purification by reversed-phase high performance liquid chromatography (RP-HPLC) which demonstrated the efficient separation of the two isoforms of hPRL. Recombinant G-hPRL-IPEN was well characterized by several techniques confirming its purity and biological activity, including comparisons with other reference preparation of pituitary origin purchased from the {sup N}ational Hormone & Peptide Program (NHPPU. S.){sup .} The composition of N-glycans present in the G-hPRL, produced by CHO cells, and that of native G-hPRL, produced by the human pituitary gland, were also determined for the first time, allowing the two structures of carbohydrates to be compared and thus, achieving one of the main goals of this project. Among the main differences in N-glycan structures, we highlight the low presence of sialic acid (NeuAc) and the high percentage of sulfated glycans (74.0%) and of fucose (Fuc) (93.3%) in the pituitary sample and the tendency of the recombinant preparation to present glycans with higher molecular weight and less isoforms variation. (author)

  11. Synthesis and characterization of polyaniline/clay conducting nanocomposites for use in protective coatings; Sintese e caracterizacao de nanocompositos condutores de polianilina/argila para utilizacao em revestimentos protetores

    Energy Technology Data Exchange (ETDEWEB)

    Baldissera, A.F.; Ferreira, C.A.; Senisse, C.A.L.; Oliveira, L.S., E-mail: alebaldissera@hotmail.co [Universidade Federal do Rio Grande do Sul (LAPOL/UFRGS), Porto Alegre, RS (Brazil). Lab. de Materiais Polimericos

    2010-07-01

    Nanomaterials have been shown highly promising materials for various technological applications. In engineering, may be noted the polymer nanocomposites, which are a new class of composite materials, where a nanoclay, or charge with nanometric dimensions, is dispersed in a polymer matrix at low concentration or volume. The clays are more common and when added in quantities less than 5% in the nanocomposites, cause a significant increase in these properties, such as mechanical, optical, magnetic barrier, and especially permeability and flammability. In this context, this work aimed at obtaining the polymeric nanocomposites of polyaniline (PAni) with different commercial clays (cloisite Na{sup +}, 10A and 30B). The preparation of PAni-MMT nanocomposites was performed by in situ polymerization of aniline in acidic (HCl). Electrical conductivity measurements, infrared spectroscopy and X-ray diffraction were some of the techniques used to characterize the nanocomposites. (author)

  12. Physical characterisation of particles and rheological of a heterogeneous system used in low-pressure injection moulding; Caracterizacao fisica de particulas e reologica de um sistema heterogeneo utilizado em moldagem de pos por injecao a baixa pressao

    Energy Technology Data Exchange (ETDEWEB)

    Zampieron, Joao Vicente

    2002-07-01

    The powder injection moulding process is a recent technology, which offers as advantages a high production of complex geometry metal parts, with low cost, where secondary operations of machinery are unnecessary. The main of this thesis was centered on a coarse powders feedstock injection. The process begins with the composition of the mass, that is the combination of metal powders with organic binders. The following steps succeed injection in moulds, debinding, sintering and, if necessary, cleaning. For the formulation of the feedstock it is indispensable the characterisation of the powders. This is little mentioned in the open literature and brings up controversy among authors. At first, a series of powders characterisations of AISI 316 L stainless steel (below 25 {mu}m) was adopted. The next step was to characterise the rheological behaviour of the feedstock using different rheological apparatus, so as to find the most appropriate equipment to the low-pressure powder injection molding process. The mass has to present a favourable rheological behaviour, which is low viscosity. The results of the physical characterisation were correlated among themselves and with the rheological characterisation. This was undertaken with the purpose of finding agreement among their values. Finally, the possibility of injection of water and gas atomised stainless steel coarse powders feedstock was studied. This presents as main advantage, the reduction of costs for the process. According to the literature, only powders with size below 25 {mu}m are possible to be injected. Hence, starting from the physical characterisation of particles and rheological characterisation of the feedstock, the formulation of an appropriate mass was found for the coarse powders. These coarse powders were characterised by particles below 45 {mu}m. In this case it was necessary to alter drastically the feedstock composition, using high amounts of wax, which lead to unstable rheological conditions. But, it was verified that feedstock constituted of coarse metallic powders which were gas atomised, are injectable, although, these powders resulted in samples with a high porosity level, while, coarse water atomised powders did not present work conditions, being therefore, discarded. (author)

  13. Characterization of the wind behavior in Botucatu-SP region (Brazil) by Weibull distributing; Caracterizacao do comportamento eolico da regiao de Botucatu-SP atraves da distribuicao de Weibull

    Energy Technology Data Exchange (ETDEWEB)

    Gabriel Filho, Luis Roberto Almeida [Universidade Estadual Paulista (CE/UNESP), Tupa, SP (Brazil). Coordenacao de Estagio; Cremasco, Camila Pires [Faculdade de Tecnologia de Presidente Prudente, SP (Brazil); Seraphim, Odivaldo Jose [Universidade Estadual Paulista (FCA/UNESP), Botucatu, SP (Brazil). Fac. de Ciencias Agronomicas; Cagnon, Jose Angelo [Universidade Estadual Paulista (FEB/UNESP), Bauru, SP (Brazil). Faculdade de Engenharia

    2008-07-01

    The wind behavior of a region can be described by frequency distribution that provide information and characteristics needed for a possible deployment of wind energy harvesting in the region. These characteristics, such as the annual average speed, the variance and shunting line standard of the registered speeds and the density of aeolian power average hourly, can be gotten by the frequency of occurrence of determined speed, that in turn must be studied through analytical expressions. The more adjusted analytical function for aeolian distributions is the function of density of Weibull, that can be determined by numerical methods and linear regressions. Once you have determined this function, all wind characteristics mentioned above may be determined accurately. The objective of this work is to characterize the aeolian behavior in the region of Botucatu-SP and to determine the energy potential for implementation of aeolian turbines. For the development of the present research, was used an Monitorial Young Wind anemometer of Campbell company installed a 10 meters of height. The experiment was developed in the Nucleus of Alternative Energies and Renewed - NEAR of the Laboratory of Agricultural Energize of the Department of Agricultural Engineering of the UNESP, Agronomy Sciences Faculty, Lageado Experimental Farm, located in the city of Botucatu - SP. The geographic localization is defined by the coordinates 22 deg 51' South latitude (S) and 48 deg 26' Longitude West (W) and average altitude of 786 meters above sea level. The analysis was carried through using registers of speed of the wind during the period of September of 2004 the September of 2005. After determined the distribution of frequencies of the hourly average speed of the wind, it was determined function of associated Weibull, thus making possible the determination of the annual average speed of the wind (2,77 m/s), of the shunting line standard of the registered speeds (0,55 m/s), of the coefficient of variation (20%) and of the density of aeolian power average hourly (24,58 W/m{sup 2}). (author)

  14. Micellar copolymerization of poly(acrylamide-g-propylene oxide): rheological evaluation and solution characterization; Copolimerizacao micelar de poli(acrilamida-g-oxido de propileno): avaliacao reologica e caracterizacao de suas solucoes

    Energy Technology Data Exchange (ETDEWEB)

    Sadicoff, Bianca L.; Brandao, Edimir M.; Lucas, Elizabete F. [Universidade Federal, Rio de Janeiro, RJ (Brazil). Inst. de Macromoleculas]. E-mail: elucas@ima.ufrj.br; Amorim, Marcia C.V. [Universidade Estadual, Rio de Janeiro, RJ (Brazil). Inst. de Quimica

    2001-06-01

    Graft copolymers of polyacrylamide and poly(propylene oxide) were synthesized by a micellar copolymerization technique. The rheological properties of the copolymers solutions were evaluated and compared with literature data for solutions of the same copolymers, synthesized by solution polymerization. The effect of hydrophobe content, salt addition and surfactant addition on the rheological properties were also investigated. Increasing hydrophobe content resulted in higher solution viscosities in the semi-dilute regime. Upon addition of salts, the hydrophobic groups associated to minimize their exposure to water. In the semi-dilute region, higher contents of surfactant added resulted in lower reduced viscosities of the polymer solutions. The copolymers were qualitatively characterized by infra-red spectrometry. (author)

  15. Fractioning of sodium polyphosphate and characterization by {sup 31}P NMR: a experience to physical-chemistry lessons; Fracionamento de polifosfato de sodio e caracterizacao por RMN de 31P: um experimento para aulas de Fisico-Quimica

    Energy Technology Data Exchange (ETDEWEB)

    Lima, Emilia Celma de Oliveira; Alcantara, Glaucia Braz Alcantara; Damasceno, Fernando Cruvinel, E-mail: elima@quimica.ufg.b [Universidade Federal de Goias (UFG), Goiania, GO (Brazil). Inst. de Quimica; Moita Neto, Jose Machado [Universidade Federal do Piaui (UFPI), Teresina, PI (Brazil). Dept. de Quimica; Galembeck, Fernando [Universidade Estadual de Campinas (UNICAMP), SP (Brazil). Inst. de Quimica

    2010-07-01

    This text describes an experiment on fractional precipitation of a polymer together with determination of average degree of polymerization by NMR. Commercial sodium polyphosphate was fractionated by precipitation from aqueous solution by adding increasing amounts of acetone. The polydisperse salt and nine fractions obtained from it were analyzed by {sup 31}P nuclear magnetic resonance and the degree of polymerization of the salts and of the fractions were calculated. Long-chain sodium polyphosphate was also synthesized and analyzed. This experiment was tested in a PChem lab course but it can be used also to illustrate topics of inorganic polymers and analytical chemistry. (author)

  16. Characterization of soybean phosphatidylcholine purity by {sup 1}H and {sup 31}P NMR; Caracterizacao da pureza de fosfatidilcolina da soja atraves de RMN de {sup 1}H e de {sup 31}P

    Energy Technology Data Exchange (ETDEWEB)

    Mertins, Omar; Sebben, Marcelo; Schneider, Paulo Henrique; Pohlmann, Adriana Raffin; Silveira, Nadya Pesce da [Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS (Brazil). Dept. de Quimica]. E-mail: nadya@iq.ufrgs.br

    2008-07-01

    A strategy is proposed to evaluate the purity of phosphatidylcholine from soybean lecithin, obtained by extraction or column chromatography, using the integrals ratio of {sup 1}H NMR spectra. Integrals of methylene signals, around 1.3 and 1.6 ppm, are added and divided by the integral of the choline methyl groups, around 3.3 ppm. Before purification, a ratio of 19.68 {+-} 1.37 was determined. Using extraction, a ratio of 10.70 {+-} 0.61 was found, while from column chromatography, a value of 2.99 {+-} 0.25 was detected. {sup 31}P NMR of standard phosphatidylcholine showed signals at -0.2 and -0.9 ppm, whereas the purified one showed a single signal at -0.9 ppm. (author)

  17. Study and development of nanocomposites PBT/bentonite clay treated by ionizing radiation: preparation and characterization; Estudo e desenvolvimento de nanocompositos PBT/argila bentonita tratados por radiacao ionizante: preparacao e caracterizacao

    Energy Technology Data Exchange (ETDEWEB)

    Sartori, Mariana do Nascimento

    2014-07-01

    This work describes the preparation and characterization of composites based on poly (butylene terephthalate) - PBT and brazilian modified clay prepared by the melt intercalation. PBT nanocomposites with 3 and 5 % by weight of organically modified clay, by the addition of a quaternary ammonium salt, were prepared by extrusion using a twin-screw extruder machine. After the extrusion process, the materials were injected to obtain specimens tests samples for the characterization tests. Part of the specimens samples were irradiated using an electron beam accelerator with 1.5 MeV at room temperature in the presence of air. Samples of pure PBT and irradiated and non-irradiated nanocomposites were characterized by mechanical tests of tensile, flexural and impact, heat distortion temperature (HDT), X - ray diffraction (XRD), scanning electron microscopy (SEM), melt flow index (MFI) thermogravimetry (TG) and differential scanning calorimetry (DSC) and the correlation between the properties was discussed. The results showed that the addition of clay, in both percentages, promoted an increase greater than 50 % in tensile strength at break and a gain of around 35% in heat distortion temperature when compared to the pure polymer. The treatment with ionizing radiation of electron beam at the doses used in this study showed no significant changes in material properties. (author)

  18. Quantitative characterization of the sequential mers distribution in styrene-butadiene copolymers by {sup 13} C; Caracterizacao quantitativa da distribuicao sequencial dos meros em copolimeros de estireno e butadieno por RMN de {sup 13} C

    Energy Technology Data Exchange (ETDEWEB)

    Canevarolo, Sebastiao [Sao Carlos Univ., SP (Brazil). Dept. de Engenharia de Materiais

    1996-06-01

    Various types and grades of styrene-butadiene co-polymers were analysed by {sup 13} C-NMR: random SBR, blocked SSBR (a styrene block is introduced in the random SBR chain) and SBS triblock copolymers. It was determined the styrene content (%), the styrene-butadiene mers distribution in terms of the S-B and B-S-B sequences content (characteristics of the random portions of the chain) and also the isomers content in the butadiene phase. (author)

  19. Production and characterization of bio plastics from potato starch, poly-hydroxybutyrate and poly-hydroxybutyrate-co-valerate;Producao e caracterizacao de bioplasticos a partir de amido de batata, poli-hidroxibutirato e poli-hidroxibutirato-co-valerato

    Energy Technology Data Exchange (ETDEWEB)

    Mendes, Fernanda M.; Curvelo, Antonio A.S., E-mail: fernanda@iqsc.usp.b [Universidade de Sao Paulo (IQ/USP), Sao Carlos, SP (Brazil). Inst. de Quimica

    2009-07-01

    This work describes the study of thermoplastic starch (TPS) blends obtained from potato starch (plasticised with glycerol) with biodegradable polymers poly-hydroxybutyrate (PHB) and poly-hydroxybutyrate-co-valerate (PHB V). For this purpose it were developed several formulations with TPS/PHB, TPS/PHB V and TPS/PHB/PHB V prepared by physical mixing and water and glycerol as plasticizers. The amount of glycerol was 30% based on starch (dry basis). The starting materials (starch, PHB and PHB V) were characterized by scanning electron microscopy and X-ray diffraction. Then, it was determined the optimal processing conditions for the samples, performed by using an intensive mixer. The materials were hot pressed to produce the standardized samples employed in the characterizations: mechanical testing (tensile strength), dynamic-mechanical thermal analysis (DMTA), scanning electron microscopy and X-ray diffractometry. (author)

  20. Construction and characterization in vitro of a bicistronic retroviral vector coding endostatin and interleukin-2 for use in gene therapy; Construcao e caracterizacao in vitro de um vetor retroviral bicistronico codificando endostatina e interleucina-2 para utilizacao em terapia genica

    Energy Technology Data Exchange (ETDEWEB)

    Calvo, Fernanda Bernardes

    2009-07-01

    Gene therapy has been used in preclinical studies and clinical trials in order to alleviate or cure a disease. Retroviral vectors are a tool for gene transfer is widely used. Bicistronic vectors are an attractive alternative for treatment of complex diseases. A variety of options exists to simultaneously express two genes in genetically modified cells. The most common approach relies on bicistronic vectors in which the genes are linked to each other by an internal ribosome entry site allowing co-translational expression of both cistrons. Endostatin, the C-terminal fragment of collagen XVIII, is a potent angiogenesis inhibitor. At present, ES has been widely used in anti-angiogenic in a variety of experimental tumor models, and clinical trials to test it as an anti-tumor agent are already under way. Immunotherapy has been used as adjuvant treatment for tumors and has been used in several preclinical studies and clinical trials. The objective of this project was to construct and characterize 'in vitro' an IRES-based bicistronic retroviral vector encoding endostatin and interleukin-2. The construction of the vector was performed in three stages, the final construction was analyzed by restriction analysis and sequencing. Packaging cells were prepared. The endostatin and interleukin-2 levels were determined by Dot blot. Monocistronic and bicistronic mRNA expression were analyzed by real time RT-PCR. Bicistronic vector showed high levels of virus trites, ranging from 4.20x10{sup 5} to 1.53x10{sup 6}UFC/ml. Secreted levels of endostatin and interleukin-2 ranged from 1.08 to 2.08{mu}g/10{sup 6}cells.24h and 0.66 - 0.89{mu}g/10{sup 6}cells.24h, respectively. The mRNA expression of ES in the NIH3T3 clone pLend-IRES-IL2SN was 2 times higher than the level presented by the NIH3T3 clone pLendSN. The endostatin promoted inhibition (40%) of endothelial cell proliferation. Interleukin-2 promoted a proliferation of 10.6% lymphocytes CD4 and 8.9% of CD8. We conclude that the IRES bicistronic vector provides a powerful tool for studies of cell biology of cancer and new therapeutic strategies. (author)

  1. Preparation and characterization of electrocatalysts based on palladium for electro-oxidation of alcohols in alkaline medium; Preparacao e caracterizacao de eletrocatalisadores a base de paladio para oxidacao eletroquimica de alcoois em meio alcalino

    Energy Technology Data Exchange (ETDEWEB)

    Brandalise, Michele

    2012-07-01

    In this study Pd/C, Au/C, PdAu/C, PdAuPt/C, PdAuBi/C and PdAuIr/C electrocatalysts were prepared by the sodium borohydride reduction method for the electrochemical oxidation of methanol, ethanol and ethylene glycol. This methodology consists in mix an alkaline solution of sodium borohydride to a mixture containing water/isopropyl alcohol, metallic precursors and the Vulcan XC 72 carbon support. The electrocatalysts were characterized by energy dispersive X-ray (EDX), X-ray diffraction (XRD), transmission electron microscopy (TEM) and cyclic voltammetry. The electrochemical oxidation of the alcohols was studied by chronoamperometry using a thin porous coating technique. The mechanism of ethanol electro-oxidation was studied by Fourier Transformed Infrared (FTIR) in situ. The most effective electrocatalysts were tested in alkaline single cells directly fed with methanol, ethanol or ethylene glycol. Preliminary studies showed that the most suitable atomic composition for preparing the ternary catalysts is 50:45:05. Electrochemical data in alkaline medium show that the electrocatalysts PdAuPt/C (50:45:05) showed the better activity for methanol electro oxidation, while PdAuIr/C was the most active for ethanol oxidation and PdAuBi/C (50:45:05) was the most effective for ethylene glycol oxidation in alkaline medium. These results show that the addition of gold in the composition of electrocatalysts increases their catalytic activities. The spectroelectrochemical FTIR in situ data permitted to conclude that C-C bond is not broken and the acetate is formed. (author)

  2. Characterization of the natural radioactivity of materials used in civil construction or the Curitiba, Parana state, Brazil, metropolitan region; Caracterizacao da radioatividade natural de materiais utilizados na construcao civil da regiao metropolitana de Curitiba

    Energy Technology Data Exchange (ETDEWEB)

    Perna, Allan F.N.; Martins, Patricia; Paschuk, Sergei A.; Correa, Janine N.; Claro, Flavia Del, E-mail: sergei@utfpr.edu.br [Universidade Tecnologica Federal do Parana (UTFPR), Curitiba, PR (Brazil); Rocha, Zildete; Santos, Talita O., E-mail: rochaz@cdtn.br [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte, MG (Brazil)

    2011-07-01

    This paper performs an analysis of the natural radioactivity of construction materials (mainly the {sup 222}Rn) which are present in human environment. The main objective of the study is to characterize different building materials which come from the metropolitan region of the Curitiba related to the exhalation of {sup 222}Rn. The applied methodology analyse the samples of ceramic brick, plaster mortar, and fine lime from the concentration measurements of radon using CR-39 type detectors, and gamma spectrometry analysis

  3. Development of a impact limiter for radioactive material transport packages - characterization of the polymeric material used; Desenvolvimento de amortecedor de impacto para embalagens para transporte de material radioativo - caracterizacao do material polimerico utilizado

    Energy Technology Data Exchange (ETDEWEB)

    Mourao, Rogerio Pimenta [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN), Belo Horizonte, MG (Brazil)]. E-mail: mouraor@urano.cdtn.br; Mattar Neto, Miguel [Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil)]. E-mail: mmattar@net.ipen.br

    2000-07-01

    Impact limiters are sacrificial components widely used to protect radioactive waste packages against damages arising from falls, fires and collisions with protruding objects. Several materials have been used as impact limiter filling: wood, aluminum honeycomb, and metallic or polymeric foams. Besides, hollow structures are also used as shock absorbers, either as a single shell or as a tube array. One of the most popular materials among package designers is rigid polyurethane foam, owing to its toughness, workability, low specific weight, low costs and commercial availability. In Brazil, a foam developed using the polymer extracted from the castor oil plant (Ricinus communis) is being studied as a potential impact limiter filling. For a better performance of this material, it is necessary to minimize the impact limiter dimensions without compromising the package safety. For this, a detailed knowledge of the foam physical and mechanical properties is essential. A relatively vast amount of data about regular polymeric foams can be found in the literature and in foreign manufacturers brochures, but no data has been published about the properties of the castor oil foam. This paper presents data gathered in an ongoing research program aiming at the development of a Type-B packaging. Foam samples were submitted to uniaxial static compression tests and to hydrostatic tests. The results obtained reveal that the castor oil foam has a mechanical behavior similar to that of regular foams, with good property reproducibility and homogeneity. (author)

  4. Study of (Fe/HZM-5) catalyst be used in the Fischer-Tropsch synthesis: preparation and characterization; Estudo do catalisador (Fe/HZSM-5) a ser utilizado na sintese de Fischer-Tropsch: preparacao e caracterizacao

    Energy Technology Data Exchange (ETDEWEB)

    Gonzaga, Arthur C. [Universidade Estadual do Maranhao (UEMA0), MA (Brazil); Sousa, Bianca V. de; Lima, Wellington S.; Rodrigues, Meiry G.F. [Universidade Federal de Campina Grande (UFCG), PB (Brazil). Unidade Academica de Engenharia Quimica

    2008-07-01

    In this work it was developed an iron catalyst supported on the ZSM-5 zeolite to be used in the Fischer-Tropsch Synthesis (FTS). The NH{sub 4}{sup +}ZSM-5 zeolitic support was submitted to the wet impregnation, using the 0.1 M of the Fe(NO{sub 3}){sub 3}.9H{sub 2}O solution to obtain the Fe/NH{sub 4}{sup +}ZSM-5 sample in the content of iron 5% wt. After, the material was submitted for the drying process and in the following, for the calcination one, obtaining the Fe/HZSM-5 form. The EDS characterization analyses showed that in the Fe/HZSM-5 sample the iron is in the Fe{sub 2}O{sub 3} form and that the impregnation and calcination processes did not cause significant exchanges in the zeolitic support framework. The results of the N{sub 2} physical adsorption of the 5% Fe/HZSM-5 showed the presence of the micropores and mesopores. From these results, the obtained material (5% Fe/HZSM-5) presents a great potential to be used like a catalyst in the FTS. (author)

  5. Method of semi-automatic high precision potentiometric titration for characterization of uranium compounds; Metodo de titulacao potenciometrica de alta precisao semi-automatizado para a caracterizacao de compostos de uranio

    Energy Technology Data Exchange (ETDEWEB)

    Cristiano, Barbara Fernandes G.; Dias, Fabio C.; Barros, Pedro D. de; Araujo, Radier Mario S. de; Delgado, Jose Ubiratan; Silva, Jose Wanderley S. da, E-mail: barbara@ird.gov.b, E-mail: fabio@ird.gov.b, E-mail: pedrodio@ird.gov.b, E-mail: radier@ird.gov.b, E-mail: delgado@ird.gov.b, E-mail: wanderley@ird.gov.b [Instituto de Radioprotecao e Dosimetria (IRD/CNEN-RJ), Rio de Janeiro, RJ (Brazil); Lopes, Ricardo T., E-mail: ricardo@lin.ufrj.b [Universidade Federal do Rio de Janeiro (LIN/COPPE/UFRJ), RJ (Brazil). Coordenacao dos Programas de Pos-Graduacao de Engenharia. Lab. de Instrumentacao Nuclear

    2011-10-26

    The method of high precision potentiometric titration is widely used in the certification and characterization of uranium compounds. In order to reduce the analysis and diminish the influence if the annalist, a semi-automatic version of the method was developed at the safeguards laboratory of the CNEN-RJ, Brazil. The method was applied with traceability guaranteed by use of primary standard of potassium dichromate. The standard uncertainty combined in the determination of concentration of total uranium was of the order of 0.01%, which is better related to traditionally methods used by the nuclear installations which is of the order of 0.1%

  6. Chemometrics application in fuel's MTR type chemical characterization by X-ray fluorescence; Aplicacao da quimiometria para caracterizacao quimica de combustiveis tipo MTR por fluorescencia de raios-X

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Clayton Pereira da

    2012-07-01

    In Brazil and worldwide the nuclear power has occupied a prominent position with many applications in industry, power generation, environment and medicine, improving the quality of tests and treatments, therefore people's lives. Uranium is the main element used in nuclear facilities and it s employed as base material to generation of electricity in the manufacture of radiopharmaceuticals. In the '50s, during the Cold War, the then newly created International Atomic Energy Agency proposed to oversee nuclear facilities and encourage the manufacture of nuclear fuels with low-enriched uranium (LEU) fuel came then type Material Test Reactor (MTR), manufactured initially in U{sub 3}O{sub 8} and U{sub 3}Si{sub 2} later, both dispersed in aluminum. The use of this technology requires a constant improvement of all processes involving the manufacture of MTR subject to several international protocols, which seek to ensure the reliability of the fuel from the standpoint of practical and environmental. In this context, the control of impurities, from the point of view of neutron economy, directly affects the quality of any nuclear fuel, so strict control is necessary. The literature has reported procedures which, beyond generating residues, are lengthy and costly, they need calibration curve and consequently reference materials. The aim of this work is to establish and validate a methodology for nondestructive quantitative chemical analysis, low cost and analysis time, as well as minimize the generation of waste, for multielement determination of major constituents (Utotal and Si) and impurities (B, Mg, Al, Cr, Mn, Fe, Co, Ni, Cu, Zn, Mo, Cd and others) present in U3O8 and U{sub 3}Si{sub 2}, meeting the needs of nuclear reactors in the nuclear fuel qualification type MTR. For that purposes, will be applied the X-ray fluorescence technique which allows fast chemical and nondestructive analysis, aside from sample preparation procedures that do not require previous chemical treatments (dissolving, digesting, and others). To corrections like effects of spectral and matrix were applied and evaluated the fundamental parameter method, univariate calibration curve and multivariate calibration. The results were compared by means of statistical tests in accordance with ISO 17025 in MRCs (123 (1-7) and 124 (1-7)) MCRs of U{sub 3}O{sub 8} from New Brunswick Laboratory (NBL) and 16 U{sub 3}Si{sub 2} samples provided by CC of IPEN/CNEN-SP. The chemometrics is a promising method to determination of minor and major constituents on the U3Si2 and U3O8 basis nuclear fuel, because the precision and accuracy are statistically equal volumetric analysis, gravimetric and ICPOES methods. (author)

  7. Dosimetric characterization of the PTW Seven29 dosimeter and Octavius Phantom for IMRT quality control; Caracterizacao dosimetrica do dosimetro PTW Seven29 e Octavius Phantom para controle de qualidade em IMRT

    Energy Technology Data Exchange (ETDEWEB)

    Goncalves, Leandro R.; Habitzreuter, Angela B.; Santos, Gabriela R.; Watanabe, Erica Y.; Silva, Marco A.; Menegussi, Gisela; Rodrigues, Laura N.; Furnari, Laura, E-mail: leandrorg11@hotmail.com [Instituto do Cacer do Estado de Sao Paulo (ICESP), SP (Brazil). Servico de Radioterapia

    2012-12-15

    Techniques like IMRT, VMAT and tomotherapy has been used to improve dose conformity in the target, while sparing adjacent normal tissues. The complexity of this techniques challenge to correctly verify the dose delivery, in an independent way. Matrix detectors have been used for this purpose. Although, to exactly understand the dosimeter response and to identify his limitations, characterization measurements need to be performed. These dosimeters, for instance, can present angular dependence. Phantoms has been designed to, when used together the detector, eliminate this angular dependence. The aim of this work was to characterize PTW Seven 29 dosimeter and also his use with Octavius Phantom (PTW). The dosimeter showed reproducible with 0.25% the biggest standard deviation, good dose linearity and dose rate independence. Differences for output factors were obtained (<6%), but a clinical case measurement showed that the set can be used for IMRT verification. When used with Octavius Phantom the dosimeter showed low angular dependence. (author)

  8. Fabrication and electrical characterization of polyaniline-silicon heterojunction for gamma radiation dosimetry application; Fabricacao e caracterizacao eletrica de heterojuncoes de polianilina - silicio para aplicacao em dosimetria de radiacao gama

    Energy Technology Data Exchange (ETDEWEB)

    Laranjeira, Jane Maria Goncalves

    2004-08-15

    In this work a technique has been developed to fabricate high quality polyaniline-silicon heterojunction diodes for use as gas and/or ionizing radiation sensors. Polyaniline thin films (40 nm thick) produced by spin-coating on silicon substrates, were the active part of the junction structure. The devices presented excellent reproducibility of their electrical characteristics with high rectification ratio, 60,000 at {+-}1.0 V, and typical reverse current at - 1.0 V of 3 nA at 295 K. A G/I x G plot has been used to analyze the current-voltage characteristics, yielding typical series resistance of 4 k{omega} {+-} 5% and ideality factor in a range of 1,9 {+-} 0.5%. The heterojunction diode presents high sensitivity to gamma radiation in the dose range of 3 x 10{sup -2} to 7 kGy with a linear response in the forward and reverse bias. The excellent electrical characteristics together with the linear response with the dose, strongly suggest the application of this device for spectrometry or dosimetry of high doses of gamma radiation. These devices presented high sensitivity to gas moistures such as ammonia, nitric acid and trichloroethylene. In both cases the sensitivity was observed through shifts of the current-voltage curves, which can be easily monitored to provide a calibration curve of the sensor either as a radiation dosimeter or as a gas sensor for use in applications for gas monitoring or radiation dosimetry. Several aspects of the reliability physics of silicon-polyaniline heterojunction, such as degradation effects induced by local heating, charge trapping and temperature changes, have been discussed. These results further confirm the quality of the devices electrical characteristics and their suitability for radiation and gas sensors applications. Another interesting results presented in this work was the use of polyemeraldine nanofilms (thickness in the range 30-50 nm) deposited by 'spin coating' on glass substrates as an optical dosimeter for gamma radiation based on the color change of the polymer. The nanofilms devices were characterized by UV visible absorption spectroscopy. The deep blue color, characteristic of undoped polyaniline films before irradiation, becomes subsequently green as the film is being irradiated, and the film absorption coefficient exhibits a linear dependence with the logarithm of the irradiation dose from I to 10 kGy. (author)

  9. Lighting measurement station: measurements of natural lighting for characterization of sky and zenith illuminance; Estacao de medicao de iluminacao: medicao de niveis de iluminacao natural para caracterizacao de iluminancias de ceu e luminancia de zenite

    Energy Technology Data Exchange (ETDEWEB)

    Souza, Roberta Vieira Goncalves de [Minas Gerais Univ., Belo Horizonte, MG (Brazil). Escola de Arquitetura. Dept. de Tecnologia da Arquitetura e do Urbanismo]. E-mail: roberta@arq.ufmg.br; Pereira, Fernando Oscar Ruttkay [Santa Catarina Univ., Florianopolis, SC (Brazil). Dept. de Arquitetura. Lab. de Conforto Ambiental]. E-mail: feco@arq.ufsc.br

    2002-07-01

    This paper describes the assembly of a standard station for measuring the day lighting for evaluation of the natural light availability. The mounting and data obtention form will also be described from a standard IDMP day lighting station for measuring the data from measuring zenith, horizontal, and vertical illuminance of the sky and vertical irradiance for the cardinal points.

  10. Description of station waste water treatment and study of reclaiming industry ceramic red; Caracterizacao de residuos de estacao de tratamento de agua e estudo de reaproveitamento na industria de ceramica vermelha

    Energy Technology Data Exchange (ETDEWEB)

    Yadava, Y.P.; Rego, S.A.B.C.; Junior, B.S.; Bezerra, L.P.; Ferreira, R.A.S., E-mail: yadava@ufpe.br [Universidade Federal de Pernambuco (UFPE), PE (Brazil)

    2012-07-01

    So that the water meets potability standards required by the laws it passes through various treatment processes which generate waste called WTS (Water Treatment Sludge). This sludge is disposed of without any processing, however, environmental agencies and the public are demanding alternatives to this situation. Knowing this, this study aims to characterize the sludge from the Water Treatment Plant Botafogo and analyze its viability as a feedstock in the manufacture of red bricks. (author)

  11. Polymers and composites synthesis and characterization for application on PEM type fuel cells; Sintese e caracterizacao de polimeros e compositos para aplicacao em celulas a combustivel do tipo PEM

    Energy Technology Data Exchange (ETDEWEB)

    Fiuza, Raigenis da Paz; Souza, Daniele Ribeiro; Barreto, Ednardo Gomes; Boaventura Filho, Jaime Soares; Jose, Nadia Mamede [Universidade Federal da Bahia (UFBA), Salvador, BA (Brazil)]. E-mail: raigenis@gmail.com

    2006-07-01

    The PEM (proton exchanging membrane) type fuel cell presents good potential for the energy production without the residue generation. However, its manufacture presents high costs for commercial application, mainly due to the electrolyte. Sulfonated Peek (polish-ether-ether-ketone) supported or auto immobilized the in a silicone matrix is an interesting alternative as electrolyte for PEM fuel cells. The commercial PEEK in powder form was functionalized with sulfuric acid, giving the SPEEK (Sulfonated PEEK). The membranes were produced by hot pressing the SPEEK immobilized in a silicone matrix produced by the sol-gel process. The membranes obtained were characterized by DRX, FTIR, TGA, MEV, DSC and protonic conductivity measurements. (author)

  12. Viscoelastic characterization of carbon fiber-epoxy composites by creep and creep rupture tests; Caracterizacao viscoelastica por meio de ensaios de fluencia e ruptura por fluencia de compositos polimericos de matriz de matriz de resina epoxidica e fibra de carbono

    Energy Technology Data Exchange (ETDEWEB)

    Farina, Luis Claudio

    2009-07-01

    One of the main requirements for the use of fiber-reinforced polymer matrix composites in structural applications is the evaluation of their behavior during service life. The warranties of the integrity of these structural components demand a study of the time dependent behavior of these materials due to viscoelastic response of the polymeric matrix and of the countless possibilities of design configurations. In the present study, creep and creep rupture test in stress were performed in specimens of unidirectional carbon fiber-reinforced epoxy composites with fibers orientations of 60 degree and 90 degree, at temperatures of 25 and 70 degree C. The aim is the viscoelastic characterization of the material through the creep curves to some levels of constant tension during periods of 1000 h, the attainment of the creep rupture envelope by the creep rupture curves and the determination of the transition of the linear for non-linear behavior through isochronous curves. In addition, comparisons of creep compliance curves with a viscoelastic behavior prediction model based on Schapery equation were also performed. For the test, a modification was verified in the behavior of the material, regarding the resistance, stiffness and deformation, demonstrating that these properties were affected for the time and tension level, especially in work temperature above the ambient. The prediction model was capable to represent the creep behavior, however the determination of the equations terms should be considered, besides the variation of these with the applied tension and the elapsed time of test. (author)

  13. Obtaining of PA 6/Ni ferrite composites. Structural characterization by XRD of the ferrites powders and composites;Obtencao de compositos de PA 6/ferrita Ni. Caracterizacao estrutural por DRX dos pos de ferrita e dos compositos

    Energy Technology Data Exchange (ETDEWEB)

    Bezerra, Daniella C.; Gouveia, Taciana R. de; Leite, Amanda M.D.; Costa, Ana Cristina F.M.; Araujo, Edcleide M., E-mail: daniellacibele@gmail.co [Universidade Federal de Campina Grande (UFCG), PB (Brazil). Unidade Academica de Engenharia de Materiais

    2009-07-01

    In general, the ferrites are absorbers of electromagnetic radiation and have the versatility to be manufactured with different geometries, or be used in the form of polycrystalline ferrites (sintered sample), or composites of ferrite (in addition of the powder appropriate matrix). The nylon 6, in turn, belongs to a class of polymers, attractive for applications in engineering due to the combination of properties such as dimensional stability, good resistance to impact without notch and excellent chemical resistance. The objective of this study was to characterize structurally the Ni ferrite powders and nylon 6/ Ni ferrite composites obtained by X-ray diffraction (DRX). The Ni ferrite powders were mixed with a polymer matrix of nylon 6 in internal mixer Haake Blucher at a temperature of 240 deg C and 60 rpm, at concentrations of 10 and 30 wt.% of Ni ferrite powders. For both concentrations we observed the characteristic diffraction peaks of ferrite and nylon 6. (author)

  14. Chemical-mineralogical characterization and Moessbauer spectroscopy of aquamarine from Pedra Azul, Northeast of Minas Gerais; Caracterizacao quimico-mineralogica e espectroscopia Moessbauer de agua-marinha da regiao de Pedra Azul, nordeste de Minas Gerais

    Energy Technology Data Exchange (ETDEWEB)

    Viana, Rubia Ribeiro; Jordt-Evangelista, Hanna [Ouro Preto Univ., MG (Brazil). Escola de Minas. Dept. de Geologia]. E-mail: rubia@degeo.ufop.br; hanna@degeo.ufop.br; Costa, Geraldo Magela da [Ouro Preto Univ., MG (Brazil). Dept. de Quimica]. E-mail: magela@iceb.ufop.br

    2001-03-01

    Aquamarines from three pegmatites located the vicinities of the Pedra Azul city, Minas Gerais state, were investigated in terms of chemical composition, physical properties and Moessbauer spectroscopy. The small lenticular pegmatite bodies are usually less than 5 m wide and exhibit a conspicuous mineralogical and textural zoning. The last thermal event in these pegmatites, determined by K-Ar method in muscovite, is of Neo proterozoic age, coincident with the late stages of the Brasiliano tectono- metamorphic cycle. Chemical analyses showed that sodium is the alkali with higher contents in the aquamarines, thus enabling their classification as sodic beryls. In zoned samples there is an increase of Fe as well as Mn from center to border, while no systematic variation could be detected for other elements. The specific gravity of 2.72 to 2.80 g/cm{sup 3} is higher than the values determined for samples from other pegmatites of Minas Gerais. The refraction indices are ne=1.569 - 1.579 and NW= 1.573 - 1.581 and the birefringence varies from 0.002 to 0.008. The refraction indices increase with the Be O content. The color of aquamarines varies from medium to light blue, sometimes greenish blue. Moessbauer spectra obtained at room temperature and at 80 K show that Fe{sup 2+} is the main chromophore-ion and suggest that the iron is present in octahedral sites as well as in the structural channels. Moessbauer spectra also indicate that the incorporation of Fe{sup 3+} may cause a shift from deep blue to light blue colors. Based on their aquamarine composition the pegmatites were classified as barren, poor in rare alkalis (Li, Rb, Cs) and therefore little differentiated. The relatively simple mineralogy and the lack of lithium minerals such as lepidolite and spodumene confirm this classification. Thus, the composition of beryl can be used as a tracer for the prospection of pegmatites with different degrees of differentiation and consequently with different types of mineralization. (author)

  15. Proposal of a methodology to be applied for the characterization of external exposure risk of employees in nuclear medicine services; Proposta de uma metodologia para caracterizacao de risco de exposicao externa de funcionarios de servicos de medicina nuclear

    Energy Technology Data Exchange (ETDEWEB)

    Simoes, Rafael Figueiredo Pohlmann

    2010-07-01

    Nuclear medicine procedure requires the administration of radioactive material by injection, ingestion or inhalation. After incorporation, the patient becomes a mobile source of radiation and, after their examination; they can irradiate everyone on their way out of the Nuclear Medicine Service (NMS). A group of workers in this path is considered a critical group, but there are no conviction on this classification, because there are not measurements available. Thus, workers claiming for occupationally exposed individual's (OEI) rights are common. Employers are always in a complex situation, because if they decided to undertake the individual external monitoring of the critical working groups, the Court considers all as OEI and employers are taxed. On the other hand, if they do not provide monitoring, it is impossible to prove that these workers were not exposed to effective doses higher than individual annual public's limit and they lose the actions, too. This work proposes a methodology to evaluate, using TLD environmental monitors, air kerma rate at critical staff points in a NMS. This method provides relevant information about critical groups' exposure. From these results, the clinic or hospital may prove technically, without individual monitoring of employees, the classification of areas and can estimate the maximum flow of patients in the free areas which guarantees exposures below the public individual dose limit. This methodology has been applied successfully to a private clinic in Rio de Janeiro, which operates a NMS. The only critical group that received exposure statistically different from clinic background radiation was that on the antechamber of the NMS. This is a site that should be characterized as a supervised area and the group of workers in this environment as OEI, as the estimated extrapolated annual effective dose in this position was 1.2 +- 0.7 mSv/year, above the public annual limit (1,0 mSv/year). Normalizing by the number of patients, it can be seen that on average each patient contributes to the effective dose with about 1.0 {mu}Sv at this point, considering the conditions of the clinic at the time of analysis. Therefore, the maximum number of patients that could be attended in this area as a free area would be 1000 patients per year. (author)

  16. Characterization of barium titanate powder doped with sodium and potassium ions by using Rietveld refining; Caracterizacao do po de titanato de bario dopado com ions sodio e potasio com o refinamento de Rietveld

    Energy Technology Data Exchange (ETDEWEB)

    Andrade, M.C.; Assis, J.T.; Pereira, F.R., E-mail: mcalixto@iprj.uerj.b [Universidade do Estado do Rio de Janeiro (IPRJ/UERJ), Nova Friburgo, RJ (Brazil). Instituto Politecnico; Araujo, J.C. [Universidade do Estado do Rio de Janeiro (FFP/UERJ), Sao Goncalo, RJ (Brazil). Fac. de Formacao de Professores; Moreira, E.L.; Moraes, V.C.A.; Lopes, A.R. [Centro Brasileiro de Pesquisas Fisicas (CBPF/MCT), Rio de Janeiro, RJ (Brazil)

    2009-07-01

    A solid-reaction synthesis of doped barium titanate was done by employing barium carbonates, sodium, potassium and titanium oxides with classic procedures. Rietveld refining of X ray diffraction data of perovskite samples with tetragonal symmetry was applying and show good agreement. Besides, the treatment performed from 600 deg C produces nanocrystals of barium titanate with average size of 33 nm. The presence of endothermic peaks related to BaTiO{sub 3} formation at relatively low temperatures was determined by thermal analysis. A pseudo-Voigt Thompson-Cox-Hastings function was used to fit the standard samples of barium titanate. The Rietveld method has showed be efficient to detect the influences of temperature and doping on barium titanate microstructures. (author)

  17. Synthesis, characterization and study of activity inhibitory of new dialkylphosphorylhdrazones on the growth of trypanosomatids; Sintese, caracterizacao e estudo da atividade inibitoria de novas dialquilfosforilarilidrazonas sobre o crescimento de tripanossomatideos

    Energy Technology Data Exchange (ETDEWEB)

    Nogueira, Andrea Janaina M.; Lima, Marco Edilson F. de; DaCosta, Joao Batista N., E-mail: dacosta@ufrrj.br [Universidade Federal Rural do Rio de Janeiro (UFRRJ), Seropedica, RJ (Brazil). Inst. de Ciencias Exatas. Dept. de Quimica; Alves, Eliomara Sousa Sobral; Anjos, Danielle Oliveira dos; Vannier-Santos, Marcos Andre; Lanfredi-Rangel, Adriana [Fundacao Oswaldo Cruz, Salvador, BA (Brazil). Centro de Pesquisas Goncalo Moniz

    2011-07-01

    A new series of dialkylphosphorylhydrazones was synthesized through the condensation of aromatic aldehydes with different phosphorylhydrazines. All synthesized compounds were characterized by IR, {sup 1}H-NMR, {sup 13}C-NMR and {sup 31}P-NMR spectroscopies. The in vitro investigation of the activity of these compounds against Leishmania amazonensis promastigotes and epimastigotes of T. cruzi, showed an efficient inhibition of proliferation, at non toxic concentrations to mammalian cells. The results have shown some derivatives as potential antiparasitic agents against trypanosomatids. (author)

  18. Characterization of the load. The experience of the COPEL in acquisition of the load shape typology of its customers; Caracterizacao da carga. A experiencia da COPEL na obtencao da tipologa de carga de seus consumidores

    Energy Technology Data Exchange (ETDEWEB)

    Doria, Ricardo Jose; Nakamura, Satoru; Santos, Nelson Mendes da S.; Fonseca, Carlos Eugenio Lacerda; Batalha, Lucio Flavio; Michelotti, Aristeu; Yokaichiya, Tomaz Hisatoshi; Steudel, Luiz Cesar; Born, Paulo Henrique Siqueira; Koprik, Wilson Jose; Nasser, Ivana Costa; Salmazo, Clovis Tadeu [Companhia Paranaense de Energia (COPEL), Curitiba, PR (Brazil)

    1994-12-31

    This work describes the experience of the COPEL in acquisition of the load shape typology of its customers. It also presents the complete methodology to the survey and analysis of the load shape of its customers in the low voltage 9 refs., 3 figs., 1 tabs.

  19. Water isotopic characterization of hypersaline formation of a petroleum field Reconcavo basin, Brazil; Caracterizacao isotopica de aguas de formacao hipersalinas de um campo de petroleo da Bacia do Reconcavo, Brasil

    Energy Technology Data Exchange (ETDEWEB)

    Teles, Danilo Ribeiro de Sa; Azevedo, Antonio Expedito Gomes de, E-mail: danilosateles@yahoo.com.br, E-mail: expedito@ufba.br [Universidade Federal da Bahia (UFBA), Salvador, BA (Brazil). Inst. de Fisica. Centro de Pesquisa em Geofisica e Geologia; Santos, Christian Pereira Lopes dos, E-mail: cplsgs@gmail.com [Instituto Federal Baiano, Salvador, BA (Brazil)

    2010-04-15

    Formation water is the water present in reservoir rock pores, produced together with petroleum. Usually it is hyper saline with concentrations that can be higher than 250 g/l of dissolved solids. The concentration of the dissolved elements and the isotopic composition of the water and of some of the dissolved elements can be excellent tracers to study the dynamic of underground fluid flux, the mixing of distinct sources and the origin of salinization of these waters. This work reports the isotopic composition ({delta}{sup 2}H , {delta}{sup 18}O) and electrical conductivity (EC) of formation waters from 10 wells of a petroleum field of the Reconcavo Basin, looking for their evolution, interaction with the minerals and rocks and reservoir interconnection. The samples have electric conductivity ranging from 84 to 137 mS/cm, with conductivity increasing with depth of production zone. It is observed an enrichment of deuterium and oxygen-18 with the depth of production zone, probably due to water-rock interactions that were probably increased by higher temperatures of the deeper levels and longer residence times. The samples from the production zone between 1450 to 1520 m, drained by 7 of the 10 wells sampled, show a small range in isotopic composition and in electric conductivity, indicating homogeneity in this level of the reservoir. In the shallow level of 450 m the values of {delta}{sup 2}H , {delta}{sup 18}O and EC are lower, with isotopic composition similar to the oceanic water, possibly representing the original water that entered the reservoir during the sedimentation of the basin. (author)

  20. Evaluating factorial kriging for seismic attributes filtering: a geostatistical filter applied to reservoir characterization; Avaliacao da krigagem fatorial na filtragem de atributos sismicos: um filtro geoestatistico aplicado a caracterizacao de reservatorios

    Energy Technology Data Exchange (ETDEWEB)

    Mundim, Evaldo Cesario

    1999-02-01

    In this dissertation the Factorial Kriging analysis for the filtering of seismic attributes applied to reservoir characterization is considered. Factorial Kriging works in the spatial, domain in a similar way to the Spectral Analysis in the frequency domain. The incorporation of filtered attributes via External Drift Kriging and Collocated Cokriging in the estimate of reservoir characterization is discussed. Its relevance for the reservoir porous volume calculation is also evaluated based on comparative analysis of the volume risk curves derived from stochastic conditional simulations with collocated variable and stochastic conditional simulations with collocated variable and stochastic conditional simulations with external drift. results prove Factorial Kriging as an efficient technique for the filtering of seismic attributes images, of which geologic features are enhanced. The attribute filtering improves the correlation between the attributes and the well data and the estimates of the reservoir properties. The differences between the estimates obtained by External Drift Kriging and Collocated Cokriging are also reduced. (author)

  1. Characterization of commercial ceramic adsorbents and their application on naphthenic acids removal of petroleum distillates; Caracterizacao de adsorventes ceramicos comerciais e sua aplicacao na remocao de acidos naftenicos de destilados de petroleo

    Energy Technology Data Exchange (ETDEWEB)

    Silva, J.P.; Senna, L.F. de; Lago, D.C.B. do; Silva Junior, P.F. da; Figueiredo, M.A.G. de; Dias, E.G. [Universidade do Estado do Rio de Janeiro (UERJ), RJ (Brazil)], e-mail: julia_psi@yahoo.com.br; Chiaro, S.S.X. [PETROBRAS S.A., Rio de Janeiro, RJ (Brazil). Centro de Pesquisas (CENPES)

    2006-07-01

    One denominates 'naphthenic acids' to the mixture of carboxylic acids that is present in petroleum oil, and is directly responsible for its acidity and corrosiveness in liquid phase during the refine process. These acids are also presents in distilled fraction of petroleum, causing several problems in final products quality. A possible way to remove them from petroleum distilled fractions is the adsorption in porous materials. However, the published results indicate that ion exchange resins would be the best adsorbents for this process, which would probably increase its cost. In this work, two commercial adsorbents (clay and activated alumina) were characterized by a set of physical-chemistry techniques and evaluated concerning their capacity of removing naphthenic acids from a light petroleum fraction. It was also verified the influence of a previous thermal treatment to the adsorption in their physical-chemistry characteristics and its properties. (author)

  2. Preparation, characterization and evaluation of electrocatalysts supported on functionalized carbon black for polymer exchange membrane fuel cell applications; Preparacao, caracterizacao e avaliacao de eletrocatalisadores suportados em carbono funcionalizado para aplicacao em celulas a combustivel tipo PEM

    Energy Technology Data Exchange (ETDEWEB)

    Carmo, Marcelo do

    2008-12-18

    The fuel cell technology associated with the growing exigency of low environmental impact energy became prosperous in the world energy scenery. The fuel cell is basically a device that converts directly the chemical energy of a fuel into electrical and thermal energy with a continuous operation by the constant feed of a fuel. Especially, the carbon black Vulcan XC72 is usually employed as an electro catalyst support, and some factors as an accessible and high surface area in order to get maximum particles dispersion, pore size, adequate pore distribution and the presence of functional groups in the carbon black surface are considered fundamental characteristics for an innovative materials development. However, the Vulcan XC72 still reveals insufficient conditions for these purposes. This study consists in the preparation and in the physical chemical characterization of functionalized carbon black by hydrogen peroxide and by polymeric chains with proton conduction properties, and its posterior utilization as electro catalyst support for PEMFC and DMFC application. After the carbon functionalization, an improvement in the carbon black dispersion in water media was observed, a beneficial effect for electro catalyst preparation. It was also observed, that the functional groups and the polymeric chains worked as stabilizers in the particle growing, producing much more homogeneous electrocatalysts, exhibiting smaller average particle size. Especially, in the case of polymeric chains functionalization, a decrease in the ohmic drop was observed for this system, attributed to an improvement in the proton transference. (author)

  3. Dual Utilization of Medical Services by Low Income Latino Families: An Exploratory Investigation.

    Science.gov (United States)

    Coe, Merilyn

    1985-01-01

    Interviews with 50 low income family members who used two health care providers--Kaiser Health Maintenance Organization and La Clinica de La Raza--were used to study how cost, need, access, services, and culture affected choice of provider. Cultural affinity seemed to influence decisions to use and pay for La Clinica's services. (JHZ)

  4. EL ESTRÉS CRÓNICO Y LA MEDICIÓN PSICOMÉTRICA DEL DISTRÉS EMOCIONAL PERCIBIDO EN MEDICINA Y PSICOLOGÍA CLINICA DE LA SALUD/ CHRONIC STRESS AND THE MEASUREMENT OF PERCEIVED EMOTIONAL DISTRESS IN MEDICINE & HEALTH PSYCHOLOGY

    Directory of Open Access Journals (Sweden)

    Manolete S. Moscoso*

    2011-02-01

    Full Text Available RESUMENEl propósito central de este artículo es presentar el Inventario de Distrés Emocional Percibido (IDEP e indicar su utilidaden el área de la psicología clínica de la salud. Se presenta un marco conceptual coherente y multidimensional acerca deldistrés emocional percibido. Los resultados del análisis factorial de componentes principales con rotaciones promaxclaramente indican que el IDEP es un instrumento psicométrico que presenta una descripción válida y confiable del distrésemocional percibido en pacientes con diagnóstico de cáncer. Dichas observaciones sugieren que el IDEP provee informaciónsignificativa acerca de los diferentes factores multidimensionales del distrés emocional percibido. Nuestra intención es queeste reporte empírico estimule la investigación psicométrica en Latinoamérica con la intención de replicar los resultadosobservados en el presente estudio de investigación.ABSTRACTThe central purpose of this study is to describe the Perceived Emotional Distress Inventory (PEDI and point out itsusefulness in the field of health psychology. The conceptual framework that guided the development of the PEDI, factorstructure, internal consistency, and construct validity are reported. Item responses were examined by Factor Analyses ofPrincipal Components with promax rotations. The PEDI presents three subscales that assesses Anxiety/Depression,Hopelessness, and Anger Expression as components of perceived emotional distress in cancer patients. We also discussthe important implications of replicating these results in the different regions of Latin America.

  5. Programa de tratamento integral de pacientes crônicos do Hospital de Clinicas da Universidade do Estado do Rio de Janeiro: I - Etapa diagnóstica A programme for comprehensive treatment of chronic hospital patients at the Rio de Janeiro State University Hospital: I - The diagnostic phase

    Directory of Open Access Journals (Sweden)

    Hésio de Albuquerque Cordeiro

    1977-03-01

    Full Text Available O estudo sobre redundância de hospitalização, baseado no conceito de dependência aos cuidados de enfermagem, evidenciou que, em 99 pacientes que permaneceram 25 ou mais dias internados, foram redundantes em algum momento da internação, representando um desperdício de 1094 leitos-dia (30,17% do total de leitos-dia consumidos por este grupo de pacientes . Estudou-se, também, um grupo de 102 pacientes com acompanhados durante uma semana, identificando-se 60 pacientes (59% com hospitalização desnecessária. Não se verificou diferenças estatisticamente significativas entre os grupos de pacientes redundantes e não redundantes em relação às variáveis sócio-demográficas estudadas. As condições que contribuíram com maior número de dias de redundância foram neoplasias, doenças do aparelho respiratório (pneumopatia complicada e doença pulmonar obstrutiva crônica, fraturas, hipertensão arterial com ou sem insuficiência cardíaca, acidente vascular cerebral e cirrose hepática. Face a magnitude do desperdício de recursos decorrentes da hospitalização desnecessária e riscos para o paciente da permanência prolongada no hospital, é recomendada a implantação de programas experimentais para tratamento domiciliar de pacientes crônicos.A study on redundant days of hospitalization based on the concept of nursing care dependence showed that among the 99 patients studied 68 demonstrated redundant days during their hospitalization of 25 or more days. This implies a wastage of 1094 bed-days. In another study a group of 102 patients and redundancy was identified in 60 patients. There was no significant statistical difference between the redundant and non-redundant patients according to the social and demographic variables studies. Five diseases were found to be more frequent among the redundant patients: respiratory diseases, fractures, arterial hypertension with or without cardiac failure, cerebral strokes and hepatic cirrhosis. Considering the grea wastage of material and financial resources and the risks of a long-term hospitalization for patients, it is recommended that experimental home care programmes for a more reasonable treatment of chronic patients should be tested.

  6. Práticas da psicologia clínica em face do sofrimento psíquico causado pelo desemprego contemporâneo Prácticas de psicologia clinica frente al sufrimiento psíquico causado por el desempleo contemporáneo Psychology clinical practices towards psychological suffering caused by contemporary unemployment

    Directory of Open Access Journals (Sweden)

    Daniel Abs

    2010-06-01

    Full Text Available Este estudo objetivou compreender as práticas da Psicologia Clínica em face do sofrimento psíquico causado pelo desemprego contemporâneo. Para tanto, foram entrevistados 8 psicólogos da região metropolitana de Porto Alegre, abordando os seus entendimentos sobre as temáticas de trabalho e desemprego, as suas consequências para a subjetividade dos pacientes, as intervenções utilizadas, o auxílio da abordagem teórica nessas intervenções e as possíveis contribuições da Psicologia em relação ao fenômeno estudado. Foi realizada análise de conteúdo para os dados coletados. Os enunciados foram agrupados em quatro temáticas, com as respectivas categorias: Trabalho, Desemprego, Intervenções sobre o desemprego na clínica e Lugar da Psicologia em face do desemprego. Os enunciados destacaram a falta de operadores clínicos para se lidar com esse fenômeno. Concluiu-se que o desemprego é uma temática da clínica psicológica contemporânea, e que esta necessita produzir operadores capazes de, na clínica, dar conta de fenômenos contemporâneos que estão emergindo, como o desemprego. Concluiu-se igualmente que são necessários mais estudos abordando essa temática.Este estudio tuvo el objetivo de comprender las prácticas de Psicología Clínica frente al sufrimiento psíquico causado por el desempleo contemporáneo. Para tal, fueron entrevistados 8 psicólogos de La región metropolitana de Porto Alegre, abordando sus entendimientos de las temáticas de trabajo y desempleo, consecuencias estas para la subjetividad de los pacientes, intervenciones utilizadas, auxilio del abordaje teórico en estas y posibles contribuciones de la Psicología frente al fenómeno estudiado. Fueron realizados análisis del contenido para los datos colectados. Los enunciados fueron agrupados en cuatro temáticas, con sus respectivas categorias: Trabajo, Desempleo, Intervenciones sobre el desempleo en la clínica y lugar de la Psicología frente al desempleo. Los enunciados destacaron la falta de operadores clínicos para lidar con ese fenómeno. Ese estudio concluyó que el desempleo es una temática de la Clínica Psicológica contemporánea, y que hay una necesidad de producirse operadores que den cuenta, en la clínica, de fenómenos contemporáneos que están emergiendo, como el desempleo, y que más estudios son necesarios acercándose a esta temática.This paper aims at understanding the practices of Clinical Psychology towards psychological suffering caused by contemporary unemployment. To this end, eight psychologists from Porto Alegre outskirts were interviewed. They were asked about their understanding of issues regarding work and unemployment and consequences to patients' subjectivity, intervention practices they used and the relationship of these interventions to theories and possible contributions of psychology towards the phenomenon under scrutiny. Content analysis was used to study the data collected during the interviews.Psychologists' utterances have been divided in four groups based on the following categories: work, unemployment, interventions towards unemployment and psychology's contributions to unemployment. The author concludes that clinical psychology needs to prepare professionals who are able to deal, in their clinical practices, with ever emerging contemporary phenomena such as unemployment. It is also highlighted that more investigations on this area of study are necessary.

  7. Clinical evolution of patients hospitalized due to the first episode of Acute Coronary Syndrome Evolución clínica de pacientes internados debido el primer episodio de la Síndrome Aguda de las Coronarias Evolução clinica de pacientes internados em decorrência do primeiro episódio da Síndrome Coronariana Aguda

    Directory of Open Access Journals (Sweden)

    Gislaine Pinn Gil

    2012-10-01

    Full Text Available AIM: to assess the clinical evolution of patients hospitalized due to the first episode of Acute Coronary Syndrome (ACS according to its clinical manifestation. METHODS: data were collected from 234 patients, hospitalized between May 2006 and July 2009 due to the first episode of an ACS, by consulting their medical records. RESULTS: 234 patients were hospitalized, 140 (59.8% due to Acute Myocardial Infarction (AMI. In the group with AMI, 19.3% presented complications, against 12.8% in the group with Unstable Angina (UA (p=0.19. Angioplasty levels were higher among patients with AMI than with UA (p=0.02 and coronary artery bypass graft surgery was more frequent among UA patients (p=0.03. The majority (227; 97% survived after the coronary event. Among the seven patients who died during the hospitalization, four had AMI (2.9% and three UA (3.2%. CONCLUSIONS: A larger number of complications were found among infarction victims and the accomplishment of coronary artery bypass graft surgery differed between the groups.OBJETIVO: evaluar la evolución clínica de pacientes internados por el primer episodio del Síndrome Aguda de Coronarias según su manifestación clínica. MÉTODOS: Fueron colectados datos de 234 pacientes internados entre mayo de 2006 y julio de 2009 debido el primer episodio de una ACA mediante consultas a los prontuarios. RESULTADOS: La mayoría (59,8% internó debido al Infarto Agudo del Miocardio (IAM. En el grupo con IAM, 19,3% presentaron complicaciones y 12,8% en el grupo con Angina Inestable (AI(p=0,19. La realización de angioplastia fue mayor entre los pacientes con IAM de lo que con AI (p=0,02 y la cirugía de revascularización fue más realizada entre los pacientes con AI (p=0,03. La mayoría (227; 97% sobrevivió al evento de las coronarias. Entre los siete pacientes que murieron en la internación, cuatro tenían IAM (2,9% y tres AI (3,2%. CONCLUSIONES: Hubo mayor número de complicaciones entre los infartados y la realización de revascularización del miocardio fue diferente en los dos grupos.OBJETIVO: avaliar a evolução clínica de pacientes internados pelo primeiro episódio da síndrome coronariana aguda (SCA, segundo sua manifestação clínica. MÉTODOS: foram coletados dados de 234 pacientes internados entre maio de 2006 e julho de 2009, em decorrência do primeiro episódio de uma SCA, mediante consultas aos prontuários. RESULTADOS: a maioria (59,8% foi internada devido ao infarto agudo do miocárdio (IAM. No grupo com IAM, 19,3% apresentaram complicações e 12,8% no grupo com angina instável (AI (p=0,19. A realização de angioplastia foi maior entre os pacientes com IAM do que com AI (p=0,02 e a cirurgia de revascularização foi mais realizada entre os pacientes com AI (p=0,03. A maioria (227 - 97% sobreviveu ao evento coronariano. Entre os sete pacientes que morreram na internação, quatro tinham IAM (2,9% e três AI (3,2%. CONCLUSÕES: houve maior número de complicações entre os infartados e a realização de revascularização do miocárdio foi diferente nos dois grupos.

  8. Isolation of Pseudomonas aeruginosa strains from dental office environments and units in Barretos, state of São Paulo, Brazil, and analysis of their susceptibility to antimicrobial drugs Isolamento de cepas de Pseudomonas aeruginosa provenientes do meio ambiente e de equipos dentarios em clinicas dentarias em Barretos, São Paulo, Brasil; analises da susceptibilidade das cepas a drogas antimicrobianas

    OpenAIRE

    Ana Claudia De Oliveira; Renato Pariz Maluta; Ariel Eurides Stella; Everlon Cid Rigobelo; José Moacir Marin; Fernando Antonio Ávila

    2008-01-01

    A wide variety of opportunistic pathogens has been detected in the tubing supplying water to odontological equipment, in special in the biofilm lining of these tubes. Among these pathogens, Pseudomonas aeruginosa, one of the leading causes of nosocomial infections, is frequently found in water lines supplying dental units. In the present work, 160 samples of water, and 200 fomite samples from forty dental units were collected in the city of Barretos, State of São Paulo, Brazil and evaluated b...

  9. APOE epsilon4 and Alzheimer's disease: positive association in a Colombian clinical series and review of the Latin-American studies Asociación positiva entre APOE épsilon4 y demencia de Alzheimer en una serie clinica en Bogotá (Colombia y revision de los estudios latinoamericanos

    Directory of Open Access Journals (Sweden)

    Martine Jacquier

    2001-03-01

    Full Text Available OBJECTIVE: As the strength of the association between the APOE epsilon4 allele and Alzheimer's disease (AD varies across ethnic groups, we studied if there was such an association in Colombian patients. METHOD: We performed apolipoprotein E (APOE genotyping in a clinical sample of 83 unrelated AD patients, predominantly late-onset (>65 yrs including familial ( n =30 and sporadic AD cases (n= 53 diagnosed according to NINCDS-ADRDA criteria and assessed by a multi-disciplinary team. Control subjects (n = 44 had no significant cognitive impairment by medical interview and neuro-psychological testing. RESULTS: We found a high association (OR= 5.1 95%CI 1.9 -13.6 between APOE epsilon4 and AD, in this series with predominantly late-onset cases with familial aggregation in 24 cases (28.9%. A significant negative association was found between epsilon2 and AD (OR= 0.2 95% CI 0.05-0.75. CONCLUSION: Further population-based surveys in Colombia are warranted to precise a possible dose effect of APOE epsilon4.OBJETIVO: Como la fortaleza de la asociación entre el alelo épsilon4 del gen APOE y la enfermedad de Alzheimer (EA difiere entre grupos étnicos, quisimos evaluar si esta asociación existe en pacientes colombianos. MÉTODOS: Realizamos una genotipificación para el gen de la apolipoproteina E (APOE en una muestra clínica de 83 pacientes con EA no relacionados, de inicio predominantemente tardío (> 65 años, incluyendo casos familiares (n=30 y esporádicos (n=53 diagnosticados según los criterios del NINCDS-ADRDA y evaluados por un equipo multi-disciplinario. Los sujetos control (n= 44 no presentaban deterioro cognoscitivo de acuerdo con la entrevista médica y la evaluación neuropsicológica. RESULTADOS: Hallamos una alta asociación (OR= 5.1; IC95% 1.9- 13.6 entre APOE épsilon4 y EA en la serie de casos de inicio tardío y con agregación familiar en 24 sujetos (28.9%. Una asociación negativa, estadísticamente significativa, fue encontrada entre épsilon2 y EA (OR= 0.2; IC95% 0.05-0.75. CONCLUSIÓN: En Colombia son necesarios futuros estudios con base poblacional para poder precisar la existencia o no de un efecto de dosis de APOE épsilon4.

  10. Evaluation of conventional x-ray diagnostic equipment and radiological protection systems of hospitals and clinics installed in Recife city, Brazil; Avaliacao dos equipamentos de raios-X diagnostico convencionais e dos sistemas de protecao radiologica de clinicas e hospitais da cidade de Recife

    Energy Technology Data Exchange (ETDEWEB)

    Passos, Robson Silva

    1999-05-15

    Diagnostic radiology is the main contributor to the man-made exposure of general population. Since Quality Assurance (QA) programs ensure high quality diagnostic images with the lowest possible radiation dose to the patient, it has been recommended that all introduce QA programs for their radiological facilities. Consequently it is important to check the adequacy of equipment operating parameters in diagnostic radiography facilities, to ensure that a high quality of service is delivered. The purpose of this study was to evaluate the operating conditions of diagnostic units installed in Recife, Pernambuco. The study included 31 X-ray units from both public and private diagnostic services. The following parameters were evaluated: coincidence between the luminous and radiation fields; alignment of the radiation beam; agreement between the real and preset values of kVp and exposure time; filtration; half value lower (HVL); luminance of the view box; uniformity of the luminance; illuminance of the environment. The results showed that 20% of the equipment surveyed exhibited discrepancies between the luminous and radiation fields greater than 2% of the source to skin distance. The test of kilovoltage showed that 48% of the units do not fulfill the acceptability criteria, presenting discrepancies higher than {+-} 10% between the measured and preset values. The results of the accuracy of the timer indicated that 81% of the equipment surveyed present a discrepancy greater than {+-} 10% between the time selected in the control panel and actual exposure time.The test of the filtration shown that, in 20% of the equipment, this was inferior to 2,5 mm Al. The test of the luminance of view box shown that 96% of the equipment, shown a luminance lower of 2.000 cd/m{sup 2}. Related to the test of the uniformity of the luminance, 81 % of the equipment shown a variation of the uniformity higher then 10%. The test of the iluminancy of the environment shown that 61 % of the equipment presented on iluminancy level out of the gap between 50 and 100 lux. The results of this survey showed that a high percentage of the equipment surveyed demonstrated inadequate operating conditions, reinforcing the need to implement quality control protocols in conventional x-ray units located in Recife. (author)

  11. Association among nursing diagnoses, demographic variables, and clinical characteristics of patients with high blood pressure Asociación entre diagnósticos de enfermería y variables sociales/clinicas en pacientes hipertensos Associação entre diagnósticos de enfermagem e variáveis sociais/clínicas em pacientes hipertensos

    Directory of Open Access Journals (Sweden)

    Francisca de Fátima Vasconcelos

    2007-09-01

    Full Text Available OBJECTIVES: To analyze the association among diagnoses, demographic variables, and clinical characteristics of patients with high blood pressure. METHODS: The data were collected in 67 patients from a primary care unit in Fortaleza, Brazil. The NANDA Taxonomy was used to determine the nursing diagnoses. Data analysis consisted of Fisher's exact test, Chi-square test, and likelihood ratio test. RESULTS: Fifty four nursing diagnoses were identified; fifteen were above the 75th percentile. Ineffective individual therapeutic regimen management and number of medication, sleep pattern disturbance and marital status, activity intolerance and education, activity intolerance and time of diagnoses, sexual dysfunction and gender, sexual dysfunction and education, risk for falls and age, marital status and time of diagnoses, chronic pain and marital status all had significant association coefficients. CONCLUSION: Some demographic characteristics were associated with nursing diagnoses.OBJETIVO: Analizar la asociación estadística entre diagnósticos y características sociales / clínicas de pacientes hipertensos. MÉTODOS: Los datos fueron recolectados en una unidad básica de salud de Fortaleza-Ceará con 67 pacientes. La identificación de los diagnósticos se llevó a cabo según la taxonomía de la NANDA. Para el análisis de los datos se utilizó test de Fisher, Chi-Cuadrado de Pearson y Razón de Verosemejanza. RESULTADOS: Se encontró 54 diagnósticos de enfermería y 15 sobre el percentil 75. Se verificó asociación estadística entre: Control eficaz del régimen terapéutico y número de medicamentos; Patrón de sueño perturbado y estado civil; Intolerancia a la actividad y escolaridad y años de diagnóstico; Disfunción sexual y sexo y escolaridad; Riesgo para caídas y edad, estado civil y tiempo de diagnóstico de la enfermedad; Dolor crónico y estado civil. CONCLUSIÓN: Algunas características demográficas están asociadas a la ocurrencia de diagnósticos de enfermería.OBJETIVO: Analisar a associação estatística entre diagnósticos e características sociais / clínicas de pacientes hipertensos. MÉTODOS: Os dados foram coletados numa unidade básica de saúde de Fortaleza-Ce com 67 pacientes. A identificação dos diagnósticos foi procedida segundo a taxonomia da NANDA. Para análise dos dados utilizou-se testes de Fisher, Qui-Quadrado de Pearson e Razão de Verossimilhança. RESULTADOS: Encontrou-se 54 diagnósticos de enfermagem e 15 acima do percentil 75. Verificou-se associação estatística entre: Controle eficaz do regime terapêutico e número de medicamentos; Padrão de sono perturbado e estado civil; Intolerância à atividade e escolaridade e anos de diagnóstico; Disfunção sexual e sexo e escolaridade; Risco para quedas e idade, estado civil e tempo de diagnóstico da doença; Dor crônica e estado civil. CONCLUSÃO: Algumas características demográficas estão associadas à ocorrência de diagnósticos de enfermagem.

  12. Comparative analysis between two-dimensional (2D) and three-dimensional (3D) MRI acquisitions - clinical applications for the evaluation of the knees in juvenile rheumatoid arthritis (JRA); Analise comparativa entre aquisicao tri (3D) e bidimensional (2D) em ressonancia magnetica - aplicabilidade clinica em joelhos em artrite reumatoide juvenil (ARJ)

    Energy Technology Data Exchange (ETDEWEB)

    Doria, Andre S. [Hospital das Clinicas, Sao Paulo, SP (Brazil). Inst. de Radiologia; Rebelo, Marina de Sa [Hospital das Clinicas, Sao Paulo, SP (Brazil). Instituto do Coracao. Servico de Informatica; Castro, Claudio Campi de [Hospital das Clinicas, Sao Paulo, SP (Brazil). Instituto do Coracao. Servico de Ressonancia Magnetica] [and others

    2000-06-01

    In this cross-sectional study in patients with juvenile rheumatoid arthritis the authors compare two-dimensional evaluation of the maximum synovial diameter on post-contrast axial T1-weighted SE (spin-echo) sequences with volumetric (three-dimensional assessment) on post-contrast axial T1-weighted SPIR (spectral presaturation with inversion recovery) SE sequences. With the aim of determining their cost-effectiveness these two methods of assessment were compared to clinical and laboratorial parameters, as well as the presence of synovial enhancement seen on magnetic resonance imaging. (author)

  13. EL ESTRÉS CRÓNICO Y LA MEDICIÓN PSICOMÉTRICA DEL DISTRÉS EMOCIONAL PERCIBIDO EN MEDICINA Y PSICOLOGÍA CLINICA DE LA SALUD/ CHRONIC STRESS AND THE MEASUREMENT OF PERCEIVED EMOTIONAL DISTRESS IN MEDICINE & HEALTH PSYCHOLOGY

    OpenAIRE

    Manolete S. Moscoso

    2011-01-01

    RESUMENEl propósito central de este artículo es presentar el Inventario de Distrés Emocional Percibido (IDEP) e indicar su utilidaden el área de la psicología clínica de la salud. Se presenta un marco conceptual coherente y multidimensional acerca deldistrés emocional percibido. Los resultados del análisis factorial de componentes principales con rotaciones promaxclaramente indican que el IDEP es un instrumento psicométrico que presenta una descripción válida y confiable del distrésemocional ...

  14. Collimator with compensated filtration: clinical adaptation for recommendation 4f of the EU about the radiation protection in oral dental radiology; Colimador con filtracion compensada: adaptacion clinica para alcanzar la recomendacion 4F de la Union Europea sobre proteccion radiologica al paciente en radiologia odontologica

    Energy Technology Data Exchange (ETDEWEB)

    Alcaraz, M.; Garcia-Vera, C.; Bravo, C. La; Morant, J. J.; Armedo, D. Y.; Canteras, M.

    2006-07-01

    Recent recommendations by the European Union (2004) for performing lateral cranial cephalometry (LCC) state that collimation should be maximized so that only those tissues necessary are irradiated when performing clinical diagnoses, although the fact that many manufacturers do not incorporate these elements in their equipment design has been recognised (recommendations 4f). Aim: the manufacture and utilization of a collimator with a pre-patient compensating filter for LLC which may be used in most extraoraldental radiology units, as well as determining the reduction in the dose of radiation absorbed by more sensitive tissues exposed to said clinical exploration. Making use of mannequins, phantom and craniums, we constructed a collimator with a compensating filter and established the necessary technical, dosimetric and quality specifications for its clinical use. Subsequently, we studied 16 patients referred for cephalometric study, determining the radiation dose (TLDs) in both the patients (crystalline lens, frontal lobe, parotid/submaxillary/thyroid glands and brain) and in the radiographic film, as well as in different parts of the collimator/filter. Al presented we are aiming for its clinical use by carrying out LCC in another 16 patients referred of orthodontic treatment but with the pre-a patient introduction of the tested collimator with the compensating filter as a substitute for the usual technique. The collimation reduced the field or radiation by some 40% and with that, so too the radiated tissues. The compensating filter reduced the dose in tissues by some 34.2. Our collimator has allowed the radiological image to be obtained with only one third the usual radiation dose. The dose reaching the film shies only between 17% less than in the usual technique and didn't alter its diagnostic capacity. A reduction of 61,6% of the dose administered to the patient is achieved by incorporating the collimator and filter to most radiological equipment without the need for renovating or substituting existing apparatus. (Author)

  15. Clinical evaluation of the low intensity laser antialgic action of GaAlAs ({lambda}=785 nm) in the treatment of the temporomandibular disorders; Avaliacao clinica da acao antialgica do laser em baixa intensidade de arseneto de galio e aluminio ({lambda}=785 nm) no tratamento das disfuncoes da articulacao temporo-mandibular

    Energy Technology Data Exchange (ETDEWEB)

    Sanseverino, Nelly Tichauer Maluf

    2001-07-01

    The therapy with laser emitting low intensity has been currently used in the most diverse fields of medicine as therapeutic conduct for pain. It is a non invasive, painless, non-thermal and aseptic type therapy, without any collateral effects, having a good cost/benefit relationship. However, for the therapy with low-intensity laser to result in positive effects, a correct diagnosis is fundamental, as well as a protocol of adequate application. n odontology, the majority of patients diagnosed with temporomandibular disorders (TMD), present pain and limitations in the movements of the jaw. In this work, a GaAlAs laser emitting low intensity, was used, {lambda}=785 nm, in patients having a dysfunction of the temporomandibular joint with a complaint of pain. Twenty patients were divided into two groups. The group treated received laser therapy in the temporomandibular articulations and in the muscles affected. The dose applied was 45 J/cm{sup 2}, while the ten patients in the control group received 0 J/cm{sup 2}, in a total of nine applications, carried out three times a week, during three weeks. he evaluation of the patients was made through clinical examinations of manual palpation of the masseter, temporal, cervical, posterior neck and sternocleidomastoid muscles, and measurements of opening and laterality of the mouth. The results obtained showed a diminishing of the pain and an increase of the mandibular mobility in the patients treated, when compared to the control group. These results point to this therapy as being an important tool in the treatment of pain in patients with a dysfunction in the TMJ, indicating this therapeutic modality as a co-adjuvant in these treatments. (author)

  16. [Hand-foot-mouth disease: its course in the city of Milan (1980-86). Epidemiologic study gathered from the records of the community and scholastic ambulatory services of the Istituto di Clinica Dermatologic I and Dermatologia Pediatrica of the University].

    Science.gov (United States)

    Sala, F; Mansi, M; Greppi, F; Ferrari, L; Perotta, E; Andreani, B

    1989-03-01

    Hand-foot-mouth disease: the Authors describe the epidemiological observations in a period of seven years made in a big urban area of Milan. They point out the periodic course of hand-foot and mouth disease, which is present in particular during May and November and particularly in children under six years. The Authors point out the difference between males and females and they try to correlate their dates with those gathered from the study of the literature.

  17. Existe diferença no estadiamento entre doentes operados de câncer colorretal no sistema previdenciário e na clinica privada? There is any difference in staging between patients operated on for colorectal cancer in public or private hospital?

    Directory of Open Access Journals (Sweden)

    Rodrigo Cuiabano Paes Leme

    2007-06-01

    Full Text Available OBJETIVO: Avaliar se existe diferença no estadiamento de doentes submetidos à ressecção intestinal por câncer colorretal no sistema previdenciário e na clínica privada. MÉTODO: Foram estudados de forma retrospectiva 41 doentes (16 homens e 25 mulheres com idade média de 59,4 anos operados no sistema previdenciário (SP e 33 doentes (18 homens e 15 mulheres com idade média de 60,8 anos operados na clínica privada (CP. Foram avaliados o estadiamento TNM, a frequência de operações de urgência, de operações paliativas e do uso de colostomia. RESULTADOS: Não se observou diferença entre o estadiamento dos dois grupos. A frequência de operações de urgência foi 26,8% no SP e 12,1% na CP (p=0,100. As operações paliativas ( 19,5% SP x 6,1% CP e o uso de colostomia ( 26,8 SP X 15,2 CP foram maiores no sistema previdenciário porém os valores não foram estatisticamente significantes, valores de p=0,087 e p=0,352 respectivamente. CONCLUSÃO: Não há diferença significante entre o estadiamento TNM de doentes operados no sistema previdenciário e privado.BACKGROUND: To examine whether there is any difference in staging between patients operated on for colorectal cancer in public or private hospital. METHODS: This study included 41 patients (16 men and 25 women, mean age of 59.4 years old who underwent colorectal resection for adenocarcinoma in public hospital (PU and 33 patients (18 men and 15 women, mean age 60.8 years old operated in private hospital (PR. They were evaluated regarding the TNM stage, mode of presentation (elective or emergency, type of resection (curative or palliative and the use of colostomy. RESULTS: There was no significant difference in the staging among the two groups. Emergency presentation were 26.8% in the PU group and 12.1% in the PR group (p=0.100. Palliative resection (19.5% PU x 6.1% PR and the use of colostomy (26.8% PU X 15.2% PR were more frequently in the patients operated in public hospital but differences were not significant, p=0.087 and p=0.352 respectively. CONCLUSION: These findings demonstrate that there was no significant difference in staging between patients operated on for colorectal cancer in public or private hospital.

  18. Study of the positioning of the films of the MLC by a Test of bands and your influence in the clinic dosimetry in IMRT; Estudio del posicionamiento de las laminas del MLC mediante un test de bandas y su influencia en la dosimetria clinica en IMRT

    Energy Technology Data Exchange (ETDEWEB)

    Serrano Zabaleta, S.; Millan Cebrian, E.; Calvo Carrillo, S.; Alba Escorihuela, V.; Garcia Romero, A.; Ortega Pardina, P.; Canella Anoz, M.; Hernandez Vitoria, A.

    2015-07-01

    We performed a test of adjacent bands inspired by the proposed in AAPM Report No. 72, we provides a parameter characterizing the state of the MLC as to the actual position of its blades. This test has been validated by studying repeatability and reproducibility and has found the correlation between the parameter and creep detected by the ILD. Subsequently it has studied the impact of changes in the positioning of the blades on clinical dosimetry in IMRT patients, reconstructing the patient dose by Matrix Evolution team and Compass software, IBA Dosimetry. (Author)

  19. Resultados do exame anátomo-patológico e "Polymerase Chain Reaction (PCR)" na forma clinica e subclinica da infecção anal pelo Papilomavirus Humano (HPV): estudo em quatro grupos de pacientes Histopathological and PCR results for clinical and subclinical forms of HPV anal infection: study of four groups of patients

    OpenAIRE

    João Carlos Magi; Marcos Ricardo da Silva Rodrigues; Geanna Mara Lino e Silva de Resende Guerra; Maria Cecília Costa; Anderson da Costa Lino Costa; Luisa Lina Villa; Galdino José Sitonio Formiga

    2006-01-01

    O Papilomavírus Humano tem alta incidência na população. O objetivo deste trabalho é o estudo dos resultados encontrados no exame anatomo-patológico e no PCR das formas clínica e subclínica da infecção anal por HPV em quatro grupos de pacientes. MÉTODO: Foram estudados 10 pacientes com prurido anal idiopático, seis com infecção genital pelo HPV, tratada, seis com condiloma anal tratado e oito com condiloma anal. As verrugas foram biopsiadas nos oito pacientes com condiloma e feito exame de an...

  20. Resultados do exame anátomo-patológico e "Polymerase Chain Reaction (PCR" na forma clinica e subclinica da infecção anal pelo Papilomavirus Humano (HPV: estudo em quatro grupos de pacientes Histopathological and PCR results for clinical and subclinical forms of HPV anal infection: study of four groups of patients

    Directory of Open Access Journals (Sweden)

    João Carlos Magi

    2006-12-01

    Full Text Available O Papilomavírus Humano tem alta incidência na população. O objetivo deste trabalho é o estudo dos resultados encontrados no exame anatomo-patológico e no PCR das formas clínica e subclínica da infecção anal por HPV em quatro grupos de pacientes. MÉTODO: Foram estudados 10 pacientes com prurido anal idiopático, seis com infecção genital pelo HPV, tratada, seis com condiloma anal tratado e oito com condiloma anal. As verrugas foram biopsiadas nos oito pacientes com condiloma e feito exame de anuscopia de alta resolução com biópsia dirigida nos outros 22 pacientes. O material foi encaminhado para exame anátomo-patológico e depois, a partir do mesmo bloco de parafina, foi feito o exame de PCR. Resultados: O anátomo-patológico foi positivo para HPV em todos os pacientes, sendo que nos oito com condiloma confirmou-se a forma clínica e em 22 diagnosticou-se a subclínica com 13 casos de neoplasia intraepitelial associada. O PCR foi positivo em 91,9% dos 22 pacientes da forma subclínica ao anátomo-patológico e em 87,5% dos oito pacientes da forma clínica. O tipo predominante nos casos de HPV anal subclínico foi o 16 e o predominante nas verrugas foi o 11. CONCLUSÕES: O exame anátomo-patológico foi positivo para HPV em todos os pacientes, propiciando também o diagnóstico de 13 casos de neoplasia intraepitelial, sendo dois de carcinoma "in situ". O PCR foi positivo em 91,9% dos pacientes da forma subclínica ao anátomo-patológico e em 87,5% da forma clínica ao anátomo-patológico. O tipo predominante da forma subclinica foi o 16 e das verrugas foi o 11.The purpose of this study is to analyze the results found in the pathological examination and PCR test for clinical and subclinical HPV anal infections in four groups of patients. Methods: The four groups studied were: ten patients with idiopathic anal pruritus, six with treated HPV genital infection, six with treated anal condyloma, and eight with anal condyloma. Eight patients with condyloma underwent wart biopsy, and high-resolution anoscopy with directed biopsy was performed in the remaining 22 patients. Paraffin wax embedded biopsy specimens were sent to pathological analysis, and later PCR was carried out on the same samples. Results: Through the pathological examination, the presence of HPV is positive in all patients studied: clinically in the eight patients with condyloma, and subclinically in the others 22. Thirteen of these 22 patients presented and associated intraepithelial neoplasia. PCR was positive in 91,9% of the 22 patients those who presented the subclinical infection at pathology examination and 87,5% of the eight patients that presented the clinical infection the most common type of anal subclinical HPV infection was HPV-16 and HPV-11 when warts were presented. Conclusions: Pathological findings related to HPV were presented in all patients studied, and 13 cases were diagnosed two of them were carcinoma in situ. PCR was positive in 91,9% of patients presenting the subclinical infection, and in 87,5% with the clinical infection was HPV-16, and for warts HPV-11.

  1. 哌替啶-氟哌利多防治腰麻下剖宫产术寒战及胃牵拉痛的临床研究%Clinica research of pethidine and droperidor on chills and analgesia stomach-involving undergoing parturient with spinal epidural ansthesia

    Institute of Scientific and Technical Information of China (English)

    罗水莲

    2010-01-01

    目的 探讨哌替啶-氟哌利多防治腰麻下行剖宫产术寒战及胃牵拉痛的临床效果.方法 选择腰麻行剖宫产术患者ASAI~Ⅱ 160例,随机平均分成四组,每组40例,胎儿取出后即刻,A组静脉注射哌替啶25 mg和氟哌利多1.25 mg,B组静脉注射哌替啶50 mg和氟哌利多2.5 mg,C组静脉注射哌替啶10 mg和氟哌利多0.5 mg,D组静脉注射0.9%氯化钠2 ml.观察注药时(T0)、注药后5 min(T1)、10 min(T2)、20 min(T3)时平均动脉压(MBP)、血氧饱和度(SpO2)、心率(HR)、呼吸(RR),患者术中术后出现寒战的例数,停止寒战的时间,注药后患者RSS评分,患者术中清理腹腔时胃牵拉痛的VAS评分.结果 A组MBP、SpO2、HR、RR比A、C、D组平稳(P﹤0.05);注药后5min C组5例,D组33例有寒战,明显多于A、B组(P﹤0.01);术中RSS评分,评2~3分,A组例数明显多于其他组(P﹤0.01);A组患者胃牵拉痛的VAS评分明显低于C、D组(P﹤0.01).结论 哌替啶25 mg和氟哌利多1.25 mg合剂是有效防治腰麻下剖宫产术寒战及清理腹腔时胃牵拉痛的最优剂量.%Objective To investigate the clinical effectiveness of pethidine and droperidor on chills and analgesia stomach- involving undergoing parturient with spinal epidural ansthesia. Methods 160 cases of parturient women with shivering(all under combined-spinal epidural anesthesia,ASAI~Ⅱ) were divided randomly into four groups.childbirth immediate: group A ( 40 cases) treated with 25 mg pethedine and 1.25 mg droperidor; group B (40 cases) treated with 50 mg pethedine and 2.5 mg droperidor ;group C (40 cases) treated with 10 mg pethedine and 0.5 mg droperidor;group D treated with 2 ml 0.9% sodium chloride. Observe four groups patients inject drug (T0)、after 5 min inject drug (T1)、10 min(T2)、20 min(T3) MBP、SpO2、HR、RR,the cases with shivering undergoing parturient, the time of shivering arrest,the RSS scores of the patient after inject drug, the VAS scores of the patient analgesia stomach- involving. Results The MBP、SpO2、HR、RR have 22 and 12 cases of on shivering after treatment at 5 min that is more best dose (25 mg pethedine and 1.25 mg droperidor) of the effect of treatment on chills and analgesia stomach- involving undergoing parturient with spinal epidural ansthesia.

  2. 禁食、轮替疗法配合药物治疗食物不耐受的慢性荨麻疹的疗效观察%ClinicaI observations on the chronic urticaria with food specific IgG positive treatment by fasting and spell.

    Institute of Scientific and Technical Information of China (English)

    杨啸宇; 邱雄; 金泽龙; 汪平; 牟双梦; 杨闯; 陆小琴; 陈德宇

    2012-01-01

    Objective To observe the effects of fasting and spell combined with antihistamines therapy on the chronic urticaria with food specific IgG positive. Methods The cases were divided into three groups, group A was 30 cases of chronic urticaria with food specific IgG negative which were treated by mizolastine and ketotifen, group B was 30 cases of chronic urticaria with food specific IgG positive which were treated the same treatment as group A, group C was 30 cases of chronic urticaria with food specific IgG positive which were treated by mizolastine and ketotifen, simultaneously fasting and spell. The effects of three groups should be observed after 2 and 6 months treatment. The data analyzed by SPSS 17. 0 software. Results After two months treatment, the effective rate of the group A and C were no significant difference, but two of them were significant different from group B. After 6 months treatment, the effective rates of group A and C were no significant difference. , while the effective rates and the cure rates of group A and C were higher than group B. Conclusion The result show that the fasting and spell combined with antihistamines therapy was better for the chronic urticaria with food specific IgG positive. This treatment was worth popularizing.%目的 旨在采用禁食、轮替疗法联合药物对食物特异性IgG阳性的慢性荨麻疹患者进行治疗,观察其疗效.方法 慢性荨麻疹患者分为A、B、C 3组,A组为食物耐受组30例,采用咪唑斯叮、酮替芬治疗;B组为食物不耐受组30例,同样采用咪唑斯叮、酮替芬治疗;C组也为食物不耐受组30例,采用咪唑斯叮、酮替芬治疗同时,配合禁食轮替疗法.治疗2、6个月后观察其疗效,结果应用SPSS17.0统计软件包作统计学分析.结果 治疗2个月后A组与C组的有效率相差不大,差异无统计学意义,不过均优于B组;治疗6个月后,A组与C组的有效率差异无统计学意义,但均优于B组.痊愈率也明显高于B组.结论 使用禁食、轮替疗法联合药物对食物特异性IgG阳性的慢性荨麻疹患者进行治疗效果更好,值得推广.

  3. In ricordo di Vittorio Bianchi

    Directory of Open Access Journals (Sweden)

    Maurizio Cutolo

    2011-09-01

    Full Text Available Vittorio Bianchi fu Ernesto e fu Mary Sbertoli naque a Cogoleto (Genova il 17 febbraio 1919. Laureato in Medicina e Chirurgia presso l’Università di Genova nel 1943 con lode fu Allievo interno della Clinica Medica di Genova negli anni 1942 e 1943, Assistente Volontario alla Clinica Medica di Perugia, quindi della Clinica Medica di Genova negli anni seguenti dove fu nominato Assistente di ruolo per concorso nel 1950. Successivamente Assistente di ruolo alla Patologia Medica diretta dal prof. Aminta Fieschi nel periodo 1954- 1969....

  4. Associations between selected allergens, phthalates, nicotine, polycyclic aromatic hydrocarbons, and bedroom ventilation and clinically confirmed asthma, rhinoconjunctivitis, and atopic dermatitis in preschool children

    DEFF Research Database (Denmark)

    Callesen, M.; Bekö, Gabriel; Weschler, Charles J.;

    2014-01-01

    Previous studies, often using data from questionnaires, have reported associations between various characteristics of indoor environments and allergic disease. The aim of this study has been to investigate possible associations between objectively assessed indoor environmental factors and clinica...

  5. Eesti nimekaim ilukirurg jagab enesekindlust / Peep Pree ; intevjueerinud Priit Pullerits

    Index Scriptorium Estoniae

    Pree, Peep, 1958-

    2006-01-01

    Vestlus Tartu esteetilise kirurgia erakliiniku Clinica juhatajaga tööst, vastutustundest, ebaõnnestumistest. Kommenteerivad Tartu linnapea Laine Jänes ja Tartu Ülikooli arstiteaduskonna emeriitprofessor Ennu Sepp

  6. Cost effectiveness of home ultraviolet B phototherapy for psoriasis : economic evaluation of a randomised controlled trial (PLUTO study)

    NARCIS (Netherlands)

    Koek, Mayke B. G.; Sigurdsson, Vigfus; van Weelden, Huib; Steegmans, Paul H. A.; Bruijnzeel-Koomen, Carla A. F. M.; Buskens, Erik

    2010-01-01

    Objective To assess the costs and cost effectiveness of phototherapy with ultraviolet B light provided at home compared with outpatient ultraviolet B phototherapy for psoriasis. Design Cost utility, cost effectiveness, and cost minimisation analyses performed alongside a pragmatic randomised clinica

  7. Cortical mapping with navigated transcranial magnetic stimulation in low-grade glioma surgery

    OpenAIRE

    Paiva WS; Teixeira MJ; Marcolin MA; Cabrera HN; Fonoff ET

    2012-01-01

    Wellingson S Paiva1, Erich T Fonoff1, Marco A Marcolin2, Hector N Cabrera1, Manoel J Teixeira11Division of Functional Neurosurgery, Hospital das Clinicas, 2TMS Laboratory of the Psychiatry Institute, Hospital das Clinicas, University of São Paulo School of Medicine, São Paulo, BrazilAbstract: Transcranial magnetic stimulation (TMS) is a promising method for both investigation and therapeutic treatment of psychiatric and neurologic disorders and, more recently, for brain ...

  8. Characterization and obtainment of thin films based on N,N,N-trimethyl chitosan and heparin through the technical layer-by-layer; Caracterizacao e obtencao de filmes finos de N,N,N-trimetil quitosana e heparina atraves da tecnica layer-by-layer

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2011-07-01

    Thin films of Heparin (HP) and N,N,N-trimethyl chitosan (TMC) with a high degree of quaternization (DQ) were obtained at pH 7.4 through the layer-by-layer (LbL) technique. Polystyrene (PS) was oxidized with aqueous solution of sodium persulfate and subsequently employed as substrate. The characterization of TMC and the respective determination of DQ were performed through {sup 1}H NMR spectroscopy. The thin films de TMC/HP were characterized by FTIR-ATR and AFM. Both techniques confirmed the adsorption of TMC and HP in surface of the PS. The increasing of the bilayers provides a decrease of the projections and/or roughness, further of minimizing the depressions at the surface of the films. Studies of thin films the base of TMC/HP prepared from the LbL technique has not been reported in the literature. It is expected that the thin films of TMC/HP present anti-adhesive and antimicrobial properties. (author)

  9. Growth and characterization of fluoride monocrystalline fibres of the type LiY{sub 1-x} RE{sub x}F{sub 4} (RE=rare-earths); Crescimento e caracterizacao de fibras monocristalinas de fluoretos do tipo LiY{sub 1-x} TR{sub x}F{sub 4} (TR=terras raras)

    Energy Technology Data Exchange (ETDEWEB)

    Espirito Santo, Ana Maria do

    2005-07-01

    In this work we present the growth and characterization of LiF pure and rare-earth doped (Er and Nd) yttrium-lithium tetra-fluoride (LiYF{sub 4} or YLF) by the micropulling- down technique (muPD). The use of this technique is original for the present purpose. A mu-PD prototype in the resistive mode was firstly built to understand the most important operational parameters. A commercial equipment was later installed and specifically modified to grow fluoride fibres. Regular and transparent single-crystalline fibres of LiF (diameter of 0.6 mm and length up to 150 mm) were obtained. LiF crystalline fibres as a potential laser media presented the same spectroscopic properties of bulk crystals. The influence of capillary and crucible shapes, growth atmosphere and start composition stoichiometry on the growth process of YLF fibers were also investigated. In general, the fluorides are very sensitive to moisture contamination. The growth atmosphere plays an important role on the stoichiometry deviation. Since this fluoride melts incongruently, any compositional changes influences the solidification behavior of the material. Additionally, a limited pulling rate is required to the YLF phase formation and to the compositional homogeneity along the fiber. Homogeneous and regular section YLF fibres, with diameters between 0.5 to 0.8 mm and up to 60 mm in length, were obtained in a suitable and reproducible growth process. Er-doped (with nominal concentration of 10 and 40 mol%) and Nd-doped (with nominal concentration of 1.7 mol%) fibres were also successfully grown. Er-doped fibres were crack-free and the dopant concentration was practically uniform along the YLF phase. However, Nd-doped fibres presented a short initial transient in its concentration. The Nd distribution coefficient was evaluated as 0.58 for the YLF fibre. This value is greater than those estimated for YLF bulk crystals grown by normal freezing processes. The optical properties of the YLF:Nd fibres were similar to those observed in bulk crystals, which drive to consider the YLF:Nd fibres as an important material to build compact all-solid-state lasers directly pumped by diodes. (author)

  10. Investigation of barium-calcium aluminate process to manufacture and characterize impregnated thermionic cathode for power microwave devices; Investigacao do processo de obtencao de aluminatos de bario e calcio para construcao e caracterizacao de catodos termionicos impregnados para aplicacao em dispositivos de microondas de potencia

    Energy Technology Data Exchange (ETDEWEB)

    Higashi, Cristiane

    2006-07-01

    In the present work it is described the barium calcium aluminate manufacture processes employed to produce impregnated cathodes to be used in a traveling-wave tube (TWT). The cathodes were developed using a tungsten body impregnated with barium and calcium aluminate with a 5:3:2 proportion (molar). Three different processes were investigated to obtain this material: solid-state reaction, precipitation and crystallization. Thermal analysis, thermogravimetry specifically, supported to determine an adequate preparation procedure (taking into account temperature, time and pyrolysis atmosphere). It was verified that the crystallization showed a better result when compared to those investigated (solid-state reaction and precipitation techniques - formation temperature is about 1000 deg C in hydrogen atmosphere), whereas it presented the lower formation temperature (800 deg C) in oxidizing atmosphere (O{sub 2}). It was used the practical work function distribution theory (PWFD) of Miram to characterize thermionic impregnated cathode. The PWFD curves were used to characterize the barium-calcium aluminate cathode. PWFD curves shown that the aluminate cathode work function is about 2,00 eV. (author)

  11. Synthesis and characterization of ceramic pigments based on oxides of chromium and iron, on TiO{sub 2}; Sintese e caracterizacao de pigmentos ceramicos a base de oxidos de cromo e de ferro, depositados sobre TiO{sub 2}

    Energy Technology Data Exchange (ETDEWEB)

    Silva, E.M. da; Galvao, S.B.; Paskocimas, C.A., E-mail: everlania_siva@yahoo.com.br [Universidade Federal do Rio Grande do Norte (UFRN), Natal, RN (Brazil)

    2011-07-01

    This work used oxides of chromium and iron, as precursors of the synthesis of ceramic pigments. The synthesis is based on the dissolution of citric acid as a complexing agent, addition of metal oxides, such as ion chromophores; polymerization with ethylene glycol and doping with titanium oxide. Passing through pre-calcination, breakdown, calcination at different temperatures (900 and 1100 ° C), resulting in pigments: green for pigment chrome deposited on TiO{sub 2} and orange for iron on TiO{sub 2}. Noticing an increase in the opacity with increasing temperature. The thermal analysis (TG and DTA), evaluated their thermal behavior, the XRD revealed the formation of crystalline phases as Iron Titanate and Chrome Titanate; SEM showed the formation of hexagonal particles for both oxides. Thus, the synthesized oxides were within the requirements for application as ceramic pigments. (author)

  12. Preparation and characterization of Nafion - TiO{sub 2} composite electrolytes for application in proton exchange membrane fuel cells; Preparacao e caracterizacao de eletrolitos compositos Nafion - TiO{sub 2} para aplicacao em celulas a combustivel de membrana de troca protonica

    Energy Technology Data Exchange (ETDEWEB)

    Matos, Bruno Ribeiro de

    2008-11-06

    The fabrication and characterization of Nafion - TiO{sub 2} composites, and the use of such electrolytes in PEM (Proton Exchange Membrane) fuel cell operating at high temperature (130 deg C) were studied. The operation of a PEM fuel cell at such high temperature is considered as an effective way to promote fast electrode reaction kinetics, high diffusional transport, and high tolerance to the carbon monoxide fuel contaminant. The polymer Nafion{sup R} is the most used electrolyte in PEM fuel cells due to its high proton conductivity. However, the proton transport in Nafion is dependent on the water content in the polymeric membrane. The need of absorbed water in the polymer structure limits the operation of the fuel cell to temperatures close to 100 deg C, above which Nafion exhibits a fast decrease of the ionic conductivity. In order to increase the performance of the electrolyte operating at high temperatures, Nafion-TiO{sub 2} composites have been prepared by casting. The addition of titania hygroscopic particles to the polymeric matrix aims at the enhancement of the humidification of the electrolyte at temperatures above 100 deg C. Three types of titania particles with different specific surface area and morphology have been investigated. Nafion-based composites with the addition of titania nanoparticles, in the 2.5-15 wt.% range, with nearly spherical shape and specific surface area up to approx. 115 m{sup 2}g{sup -1} were found to have higher glass transition temperature than the polymer. Such an increase improves the stability of the electrolyte during the fuel cell operation at high temperatures. The addition of titania-derived nanotubes results in a pronounced increase of the performance of PEM fuel cell operating at 130 deg C. In this composite, the high specific surface area and the tubular shape of the inorganic phase are responsible for the measured increase of both the absorption and retention of water of the composite electrolyte. Nonetheless, the polarization curves of fuel cell using the composite electrolytes exhibited an increase of the ohmic polarization associated with the addition of the insulating titania particles. As the chemical structure of Nafion was observed to be insensitive to the addition of the inorganic particles, the high performance of the composite electrolytes is a result of competing effects: the decrease of the electrical conductivity and a higher thermal stability or water absorption/retention capacity. The experimental results suggest that the Nafion-TiO{sub 2} composites are promising electrolytes for PEM fuel cells operating at temperatures above approx. 100 deg C. (author)

  13. Characterization of Lanthanum Ferric Cobaltite doped with Strontium (LSCF) films deposited by spray-pyrolysis for application as cathode in PaCOS-TI; Caracterizacao de filmes de CFLE depositados por spray-pirolise para utilizacao como catodo em PaCOS-TI

    Energy Technology Data Exchange (ETDEWEB)

    Almeida, L.S.; Guimaraes, V.F.; Paes Junior, H.R. [Universidade Estadual do Norte Fluminense Darcy Ribeiro (UENF), Campos dos Goytacazes, RJ (Brazil). Lab. de Materiais Avancados], Emails: laryssadsa@yahoo.com.br, valtencyguimaraes@yahoo.com.br, herval@uenf.br

    2010-07-01

    The lanthanum ferric cobaltite doped with strontium (LSCF) is a ceramic material with the perovskite structure that stands out in the field of research for its use as cathode in solid oxide fuel cells at intermediate temperatures (IT-SOFC). The films were synthesized by spray-pyrolysis technique on 8% mol Yttria stabilized zirconia (YSZ) substrates. It was studied the influence of heat treatment temperatures (600-1000 deg C) on the properties of the films under the conditions of treatment during four hours. Samples were tested electrically by measuring the variation of electrical conductivity with temperature, structurally by X-ray diffraction (XRD) and morphologically by scanning electron microscopy (SEM). The films heat treated at 700 deg C for 4 hours showed better performance for application as cathode. (author)

  14. Comparative evaluation between montmorillonite clay/LLDPE and potassium hexaniobate/LLDPE nanocomposites: characterization of mechanical and transport properties; Avaliacao comparativa entre os nanocompositos de argila motmorilonita/LLDPE e com hexaniobato de potassio/LLDPE: caracterizacao das propriedades mecanicas e de transporte

    Energy Technology Data Exchange (ETDEWEB)

    Komatsu, Daniel; Otaguro, Harumi, E-mail: daniikom@yahoo.com.br [Universidade Federal de Sao Carlos (UFSCar), SP (Brazil). Departamento de Quimica; Ruvolo Filho, Adhemar C. [Universidade Federal de Sao Carlos (UFSCar), SP (Brazil). Departamento de Engenharia de Materiais

    2014-06-01

    Linear low density polyethylene-montmorillonite clay and linear low density polyethylene-organophilic niobate nanocomposites were obtained from dilution of masterbatch with 20% w/w of fillers in the LLDPE matrix by melt intercalation using a twin-screw extruder, obtaining nanocomposites with 1.5% up to 10.0% w/w of filler. In this study mechanical and water vapor and oxygen permeation tests were used to characterize the nanocomposites. In mechanical tests an increase of modulus values and decrease of toughness value by increasing concentration of montmorillonite clay were observed. The behavior of LLDPE-organophilic niobate nanocomposites was similar to LLDPE-montmorillonite clay nanocomposites but softer due to hexaniobate structure. The distribution of the organoclay is more homogeneous than organophilic niobate to concentrations below 10.0% filler using the SEM/FEG. It is possible to see a decrease in the permeability value with increasing concentration of montmorillonite clay for both gases used. In the LLDPE-organophilic niobate nanocomposites a decrease of permeability value occurs followed by an increase of permeability value for both gases used, with increasing concentration of organophilic niobate. Furthermore, it was observed that the polarity of the gas used is an important factor in the diffusion process through the nanocomposite. (author)

  15. Nanostructured synthetic hydroxyapatite and dental enamel heated and irradiated by ER,CR:YSGG: characterized by FTIR and XRD; Hidroxiapatita sintetica nanoestruturada e esmalte dental aquecidos e irradiados por laser de Er,Cr:YSGG: caracterizacao por FTIR e por DRX

    Energy Technology Data Exchange (ETDEWEB)

    Rabelo Neto, Jose da Silva

    2009-07-01

    The study evaluate the physical changes and/or chemical that occurs in synthetic hydroxyapatite (HAP) and in enamel under action of thermal heating in oven or laser irradiation of Er,Cr:YSGG that may cause changes in its structure to make them more resistant to demineralization aiming the formation of dental caries. The synthetic HAP was produced by reaction of solutions of Ca(NO{sub 3}) and (NH{sub 4}){sub 2}HPO{sub 4} with controlled temperature and pH. The enamel powder was collected from the bovine teeth. Samples of powder enamel and synthetic HAP were subjected to thermal heating in oven at temperatures of 200 deg C, 400 deg C, 600 deg C, 800 deg C and 1000 deg C. For the laser irradiation of materials, were made with 5,79 J/cm{sup 2} of irradiation, 7,65 J/cm{sup 2}, 10,55 J/cm{sup 2} and 13,84 J/cm{sup 2} for synthetic HAP and 7,53 J/cm{sup 2}, 10,95 J/cm{sup 2}, and 13,74 J/cm{sup 2} for the enamel. The samples were evaluated by X-ray diffraction (XRD) for analysis of crystallographic phases and analysis by the Rietveld method, to determine their respective proportions in the material, as well as results of changes of the lattice unit cell parameters (axis-a, axis-c and volume), crystallites sizes and the occupation rate of sites of Ca and P atoms. The samples were analyzed by Fourier transform infrared spectroscopy (FTIR), which should compositional changes due to treatment related to carbonate, phosphate, adsorbed water and hydroxyl radicals content. The infrared was used to measure the surface temperature generated by the laser beam in the solid samples of enamel. Besides the major hydroxyapatite crystallographic phases, there was formations of octa calcium phosphate (OCP) and phase {beta} of tricalcium phosphate ({beta}-TCP ) in enamel heated at 800 deg C. There was reduction of the axis-a, volume and size of crystallites to the temperatures between 400 degree C and 600 deg C and also on laser irradiated samples. Above the temperature of 600 degree C it is observed the effect in the lattice parameters. The Ca/P relation in all the samples decreased. The enamel samples irradiated by 7,53 J/cm{sup 2} showed Ca/P equal to 1,6817 and by 13,74 J/cm{sup 2} Ca/P was 1,6831. Spectroscopy results showed that both the heating and laser irradiation cause changes primarily in the bands of carbonate, water adsorbed and hydroxyl and the crystallographic changes of the lattice may be correlated with changes in carbonate in the sites of hydroxyl and phosphates. The effects of heating in oven and laser irradiation causes reduction of carbonate content, and this effect was more evident in laser irradiated samples, there was also decreases in water and adsorbed hydroxyl contents. All these changes alter the properties of the material, as its solubility and therefore affect the demineralization process and can be useful for caries prevention as well as dental erosion prevention. (author)

  16. Hydrochemical characterization of groundwaters in projected hydroelectric power plant areas: Taquari-Antas Basin/RS, Brazil; Caracterizacao hidrogeoquimica de agua subterranea em area de influencia de futuras instalacoes de usinas hidreletricas - bacia hidrografica do rio Taquari-Antas/RS, Brasil

    Energy Technology Data Exchange (ETDEWEB)

    Scopel, Rejane Maria; Teixeira, Elba Calesso; Binotto, Raquel Barros [Fundacao Estadual de Protecao Ambiental Henrique Luis Roessler, Porto Alegre, RS (Brazil)]. E-mail: gerpro.pesquisa@fepam.rs.gov.br

    2005-06-01

    The identification and characterization of the hydrochemistry of the groundwaters has been done for seven wells. The sampling occurred during three bimonthly campaigns. The results classified the waters as of the calcium bicarbonated type for the majority of the samples, except for one well, whose composition is of the sodium bicarbonated type. The major ions found and how they determine the quality parameters are consistent with the reactions of mineral dissolution of the majority of volcanic rocks and the reactions with intrusion of alkaline rock in only one well. Anomalous values of nitrate in some wells alert to the impact of especially polluting sources at the time the reservoirs of the hydroeletric plant were formed. (author)

  17. Production and characterization of compounds based on MgB{sub 4}O{sub 7} for application in dosimetry; Producao e caracterizacao de compostos a base de MgB{sub 4}O{sub 7} para aplicacao em dosimetria

    Energy Technology Data Exchange (ETDEWEB)

    Souza, Luiza Freire de

    2016-07-01

    Many materials with luminescent properties are used for ionizing radiation dosimetry through the thermoluminescence (TL) and optically stimulated luminescence (OSL) techniques. Detectors based on lithium fluoride (LiF), calcium sulphate (CaSO{sub 4}) and aluminum oxide (Al{sub 2}O{sub 3}), doped or codoped with various elements, are the TL or OSL commercial dosimeters most widely used currently. However, several researches are focused to the development of new TL /OSL materials in intention to enhance the dosimetric properties, in view that no TL/OSL dosimeter has all the ideal characteristics for monitoring the radiation. In this context, magnesium tetraborate (MgB{sub 4}O{sub 7}), which has been presented in the literature as a material for dosimetry TL, was investigated in this work. As there are no reports on the structural characterization of this material or regarding to its applicability on OSL dosimetry, the proposal of the present work was to develop compounds based on MgB{sub 4}O{sub 7}, with different doping, by solid state synthesis. It was made the structural, optical, TL and OSL characterization of the compound to verify it feasibility for application on radiation dosimetry. Initially, it was determined the calcination temperature and time for MgB{sub 4}O{sub 7} formation, with the use of thermal analyses and x ray diffraction. The ideal calcination was found at 900 °C for 7 hours. It were produced , in powder form, the compounds: MgB{sub 4}O{sub 7}, MgB{sub 4}O{sub 7}:Dy, MgB{sub 4}O{sub 7}:Dy,Li, MgB{sub 4}O{sub 7}:Ce, MgB{sub 4}O{sub 7}:Ce,Li, MgB{sub 4}O{sub 7}:Nd and MgB{sub 4}O{sub 7}:Nd,Li. For TL and OSL analyses it were produced pellets sintering at 950 °C for 2 hours. The radioluminescence (RL) analyses of MgB{sub 4}O{sub 7}:Dy and MgB{sub 4}O{sub 7}:Dy,Li shows wavelength emissions at 490, 590, 670 and 760 nm. For MgB{sub 4}O{sub 7}:Ce and MgB{sub 4}O{sub 7}:Ce,Li RL was observed wide emission band in the ultraviolet region. For the MgB{sub 4}O{sub 7}:Nd and MgB{sub 4}O{sub 7}:Nd,Li RL were not observed emission from the ultraviolet to infrared. With the results obtained from the TL characterization, it were also discussed aspects such as: effect of sintering and dopant concentrations in emissions, influence of doping and codoping with Li in MgB{sub 4}O{sub 7} matrix, thermal treatment reuse, TL signal reproducibility, dose response curve , relative sensitivity and it were analyzed the kinetic parameters of the TL emission curves. The OSL analyses of MgB{sub 4}O{sub 7}:Dy,Li,MgB{sub 4}O{sub 7}:Ce,Li and MgB{sub 4}O{sub 7}:Nd,Li indicated that the compounds have high cross section for photoionization to the wavelength emitted by blue LEDs, and from three compounds analyzed the MgB{sub 4}O{sub 7}: Ce,Li showed greater intensity. The partial preheating and partial cleaning methods allowed to elucidate the OSL phenomenology in compounds. (author)

  18. Development and characterization of AlCrN coated Si{sub 3}N{sub 4} ceramic cutting tool; Desenvolvimento e caracterizacao de ferramentas ceramicas de Si{sub 3}N{sub 4} revestidas com AlCrN

    Energy Technology Data Exchange (ETDEWEB)

    Souza, J.V.C.; Nono, M.C.A.; Machado, J.P.B., E-mail: vitor@las.inpe.b [Instituto Nacional de Pesquisas Espaciais (INPE), Sao Jose dos Campos, SP (Brazil); Silva, O.M.M. [Centro Tecnico de Aeronautica (CTA-IAE/AMR), Sao Jose dos Campos, SP (Brazil). Inst. de Aeronautica e Espaco. Div. de Materiais; Pimenta, M. [Balzers, Jundiai, SP (Brazil); Sa, F.C.L. [Centro Universitario de Volta Redonda (UNIFOA), RJ (Brazil)

    2010-07-01

    Ceramic cutting tools are showing a growing market perspective in terms of application on machining operations due to their high hardness, wear resistance, and machining without a cutting fluid, therefore are good candidates for cast iron and Nickel superalloys machining. The objective of the present paper was the development of Si{sub 3}N{sub 4} based ceramic cutting insert, characterization of its physical and mechanical properties, and subsequent coating with AlCrN using a PVD method. The characterization of the coating was made using an optical profiler, XRD, AFM and microhardness tester. The results showed that the tool presented a fracture toughness of 6,43 MPa.m{sup 1/2} and hardness of 16 GPa. The hardness reached 31 GPa after coating. The machining tests showed an improvement on work piece roughness when machining with coated insert, in comparison with the uncoated cutting tool. Probably this fact is related to hardness, roughness and topography of AlCrN. (author)

  19. Characterization of chemical elements in soil submitted to different systems use and management by energy dispersive x-ray fluorescence spectrometry (EDXRF); Caracterizacao dos niveis de elementos quimicos em solo, submetido a diferentes sistemasde uso e manejo, utilizando espectrometria de fluorescencia de raios-X por energia dispersiva (EDXRF)

    Energy Technology Data Exchange (ETDEWEB)

    Wastowski, Arci Dirceu; Rosa, Genesio Mario da; Cherubin, Mauricio Roberto; Rigon, Joao Paulo Gonsiorkiewicz, E-mail: wastowski@smail.ufsm.b [Universidade Federal de Santa Maria (UFSM), Frederico Westphalen, RS (Brazil). Centro de Educacao Superior Norte do Rio Grande do Sul

    2010-07-01

    This study aimed to evaluate the chemical elements levels in soil, submitted to different management systems and use by the Energy Dispersive X-Ray Fluorescence Spectrometry - EDXRF. The systems were T1 - agroforestry (SAF), T2 - native field (CN), T3 - native forest (NM), T4 - tillage forest (PF); T5 - conventional tillage system (SPC) and T6 - system tillage (NT). Samples were collected at 0-10 and 10-20 cm, dried and ground for analysis in EDX-720. The soil showed no difference in the average concentrations of chemical elements analyzed in the profiles, but the systems presented different concentrations of metal elements, and T3 had the highest K, Ca and Zn at 0-10 cm and higher contents of K, Ca, Cu, Zn and Mn in the layer of 10-20 cm. (author)

  20. Characterization of residues of effluent treatment plant from lapping process of soda-lime glass and its application in the production of concrete; Caracterizacao de residuo de estacao de tratamento de efluentes de processo de lapidacao de vidro sodo-calcico e sua aplicacao na producao de concreto

    Energy Technology Data Exchange (ETDEWEB)

    Antonio, Aline Pignaton; Calmon, Joao Luiz; Tristao, Fernando Avancini, E-mail: apignaton@hotmail.com, E-mail: calmonbarcelona@gmail.com, E-mail: fernandoavancini@ct.ufes.br [Universidade Federal do Espirito Santo (UFES), Vitoria, ES (Brazil). Programa de Pos-Graduacao em Engenharia Civil

    2012-07-01

    This study enunciates the physical, chemical and mineralogical composition of the residue from the process of ETE cutting of soda-lime glasses and its application in concrete as a replacement to the weight of CPV ARI RS cement, at levels of 0, 5, 10, 15 and 20%. Tests were performed on fresh and hardened (ages 3, 7, 28 and 300 days). The results were compared and statistically analyzed. In the fresh state, reductions in the amount of exuding water and consistency were observed. The results of compressive strength were statistically different, while the results for the tensile strength by diametrical compression and modulus of elasticity results were belonging to homogeneous groups. Beneficial effects the levels of residue on the cementitious matrix and the transition zone of concrete were identified by SEM, particularly concrete in S15.

  1. Clays as green catalysts in the cholesterol esterification: spectroscopic characterization and polymorphs identification by thermal analysis methods. An interdisciplinary laboratorial proposal for the undergraduate level; Argilas como catalisadores verdes na esterificacao do colesterol: caracterizacao espectroscopica e identificacao de polimorfos por metodos de analise termica. Uma proposta laboratorial interdisciplinar para o primeiro ciclo universitario

    Energy Technology Data Exchange (ETDEWEB)

    Maria, Teresa M R.; Nunes, Rui M. D.; Pereira, Mariette M.; Eusebio, M. Ermelinda S. [Universidade de Coimbra, Coimbra (Portugal). Dept. de Quimica], e-mail: troseiro@ci.uc.pt

    2009-07-01

    A laboratory experiment that enables the professor to introduce the problematic of sustainable development in pharmaceutical chemistry to undergraduate students is proposed, using a simple synthetic procedure. Cholesteryl acetate is prepared by the esterification of cholesterol using Montmorillonite K10 as heterogeneous catalyst. Cholesterol and cholesteryl acetate are characterized by spectroscopic ({sup 1}H RMN, {sup 13}C RMN, FTIR) and thermal analysis techniques. The thermal methods are used to introduce the concepts of polymorphism and the nature of mesophases. (author)

  2. Synthesis and characterization of magnetic cobalt ferrite nanoparticles covered with 3-aminopropyltriethoxysilane for use as hybrid material in nano technology; Sintese e caracterizacao de nanoparticulas magneticas de ferrita de cobalto recobertas por 3-aminopropiltrietoxissilano para uso como material hibrido em nanotecnologia

    Energy Technology Data Exchange (ETDEWEB)

    Camilo, Ruth Luqueze

    2006-07-01

    Nowadays with the appear of nano science and nano technology, magnetic nanoparticles have been finding a variety of applications in the fields of biomedicine, diagnosis, molecular biology, biochemistry, catalysis, etc. The magnetic functionalized nanoparticles are constituted of a magnetic nucleus, involved by a polymeric layer with active sites, which ones could anchor metals or selective organic compounds. These nanoparticles are considered organic inorganic hybrid materials and have great interest as materials for commercial applications due to the specific properties. Among the important applications it can be mentioned: magneto hyperthermia treatment, drugs delivery in specific local of the body, molecular recognition, biosensors, enhancement of nuclear magnetic resonance images quality, etc. This work was developed in two parts: 1) the synthesis of the nucleus composed by superparamagnetic nanoparticles of cobalt ferrite and, 2) the recovering of nucleus by a polymeric bifunctional 3-aminopropyltriethoxysilane. The parameters studied in the first part of the research were: pH, hydroxide molar concentration, hydroxide type, reagent order of addition, reagent way of addition, speed of shake, metals initial concentrations, molar fraction of cobalt and thermal treatment. In the second part it was studied: pH, temperature, catalyst type, catalyst concentration, time of reaction, relation ratios of H{sub 2}O/silane, type of medium and the efficiency of the recovering regarding to pH. The products obtained were characterized using the following techniques X-ray powder diffraction (DRX), transmission electronic microscopy (TEM), scanning electronic microscopy (SEM), spectroscopy of scatterbrained energy spectroscopy (DES), atomic emission spectroscopy (ICP-AES), thermogravimetric analysis (TGA/DTGA), Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC) and magnetization curves (VSM). (author)

  3. Characterization of array scintillation detector for follicle thyroid 2D imaging acquisition using Monte Carlo simulation; Caracterizacao de uma matriz detectora cintiladora para aquisicao de imagem 2D da regiao folicular da glandula tireoide por emissao radioativa usando simulacao Monte Carlo

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Carlos Borges da

    2007-05-15

    The image acquisition methods applied to nuclear medicine and radiobiology are a valuable research study for determination of thyroid anatomy to seek disorders associated to follicular cells. The Monte Carlo (MC) simulation has also been used in problems related to radiation detection in order to map medical images since the improvement of data processing compatible with personnel computers (PC). This work presents an innovative study to find out the adequate scintillation inorganic detector array that could be coupled to a specific light photo sensor, a charge coupled device (CCD) through a fiber optic plate in order to map the follicles of thyroid gland. The goal is to choose the type of detector that fits the application suggested here with spatial resolution of 10 {mu}m and good detector efficiency. The methodology results are useful to map a follicle image using gamma radiation emission. A source - detector simulation is performed by using a MCNP4B (Monte Carlo for Neutron Photon transport) general code considering different source energies, detector materials and geometries including pixel sizes and reflector types. The results demonstrate that by using MCNP4B code is possible to searching for useful parameters related to the systems used in nuclear medicine, specifically in radiobiology applied to endocrine physiology studies to acquiring thyroid follicles images. (author)

  4. Hydrodynamic characterization of an alluvial soil for the Cajueiro Reservoir in Tuparetama-PE (Brazil), by using the internal drainage method; Caracterizacao hidrodinamica de um solo aluvial do Acude Cajueiro em Tuparetama-PE utilizando-se o metodo da drenagem interna

    Energy Technology Data Exchange (ETDEWEB)

    Robalinho, Aviani Maria Bezerra

    2000-10-01

    The determination of the hydraulic properties of an alluvial soil in Cajueiro reservoir has been carried out in two experimental plots of 3.5 m x 3.5 m, installed in the opposite banks of the brook in which is located the dam, (Tuparetama Country, Pernambuco). For the determination of the hydraulic conductivity as a function of the soil water volumetric content K({theta}), the internal driainage method proposed by Hillel et al. (1972) has been applied. The soil-water retention curves h ({theta}) have been determined through the experimental data of volumetric water content and pressure obtained in field experiments. The h ({theta}) and K ({theta}) curves have been fitted to van Genuchten's closed - form equations (1980), using the Burdine's model, and Brooks and Corey's model, respectively. The volumetric water content, matric potential, and total water content estimates have been fitted to two analytical functions: one being composed by the addition of three exponentials terms the other composed and by representation the reverse of the power functions. The latter has been preferred due to its smoother representation between the fast and the slow its drainage phases. Considering the hydraulic behavior, three different layers have been identified in the soil profiles of the two experimental parcels A2 and B4 in the alluvial soil Cajueiro reservoir. The second layer of the soil profile in parcel A2 turned out the more pemeable than the other two layers. As to the soil profile in parcel B4, the first layer turned out more conductive than the other layers. However, the biggest volumetric water content variations were due to the differences found in the texture and structure of the soil profiles under study. The hydrodynamic characterization of the two soil profiles, A2 and B4, brings significant elements for the simulation of scenarios related to the soil of water transport processes. It is of particular importance the study of scenarios related to the shallow soil layers, which are conditioning to agricultural developments and soil conservation. These studies are aimed at efficient crops management while the water level in the reservoir drops down. (author)

  5. Developpement and characterization of an DL-Alanine Gel to be applied in the measurement of the dose distribution with the Spectrophotometry Technique; Desenvolvimento e caracterizacao de um gel alanima para aplicacao na medida da distribuicao da dose de radiacao usando a tecnica de espectrofotometria

    Energy Technology Data Exchange (ETDEWEB)

    Mizuno, Erick Yukio

    2007-07-01

    The aim of this work is to develop a DL-Alanine, Fe-II based gel dosimeter to be applied in the dosimetry of the Co-60 gamma-radiation fields in the dose range of radiation therapy procedures. The aminoacid DL-Alanine is dissolved in an acid solution containing the Fe-II and added to the gel. A series of essays was performed with different chemicals and different procedures were made to evaluate the behavior of the obtained dosimetric gel as function of the time. The absorption spectra, before and after the irradiation, present maximum in 457 nm and 588 nm, respectively. These two peaks correspond to absorption wavelengths of the chemical species Fe-II and Fe-III, respectively, both species being in equilibrium. With the irradiation, the formation of the radicals that oxide the Fe-II into Fe-III occurs, altering the chemical balance of both species - hence the increase of the Fe-III - and causing the gel to change its tonality, in such a way that it is possible to determine the absorbed dose. In the analysis of the spectra and respective dose-response curves it was observed that the dosimetric gel shows linearity in dose range of 0.5 to 40 Gy. From the obtained linearity results, stability and lower detectable dose - 0,3 Gy - it is possible to conclude that the present DL-Alanine, Fe-II based dosimetric gel presents an excellent potential to the application to which it is proposed, namely, the determination of the dose fields in radiation therapy and its future application as a standard in the determination of these fields, in 3D, using the Magnetic Resonance Imaging. (author)

  6. Obtainment and characterization of Al{sub 2}O{sub 3} ceramic membranes applied to the produced water treatment in petroleum wells; Obtencao, caracterizacao de membranas ceramicas de Al{sub 2}O{sub 3} aplicadas para o tratamento de agua de producao em pocos petroliferos

    Energy Technology Data Exchange (ETDEWEB)

    Santos, J.J.M. dos; Cela, B.; Melo, G.N.; Timoteo Junior, J.F. [Universidade Federal do Rio Grande do Norte (PPGCEM/UFRN), Natal, RN (Brazil). Programa de Pos-Graduacao em Ciencia e Engenharia de Materiais; Paskocimas, C.A.; Floreoto, N.T. [Universidade Federal do Rio Grande do Norte (DEM/UFRN), Natal, RN (Brazil). Dept. de Engenharia de Materiais

    2008-07-01

    The use of filter membranes is widely disseminated in industry and in sanitation companies to the high quality process and use of membrane systems to treat and reuse wastewater. This work aimed the obtaining and characterization of conventional alumina membranes produced through the Slip Casting process, calcined at the temperature of 1000 deg C, heating rate used was 2 deg C/min., then the samples with starch were sintered at 1200 deg C and the ones without starch at 1300 deg C and 1400 deg C with the same heating rate used at the calcination step. The techniques used for the membranes material characterization were scanning electron microscopy (SEM), the method of Archimedes. The efficiency of the membranes was examined by the spectrophotometry methods, suspended solids and the oil concentration of the produced water samples previously treated by the oil industry. (author)

  7. Characterization of {sup 60}Co and {sup 137}Cs beams from irradiator Shepherd 81 - 14D of LNMRI/IRD in radiation protection; Caracterizacao dos feixes de {sup 60}Co and {sup 137}Cs do Irradiador Shepherd 81 - 14D do LNMRI/IRD em radioprotecao

    Energy Technology Data Exchange (ETDEWEB)

    Silva, C.N.M. da; Cabral, T.S., E-mail: cosme@ird.gov.br [Instituto de Radioprotecao e Dosimetria (IRD/CNEN-RJ), Rio de Janeiro, RJ (Brazil)

    2015-07-01

    The objective of this work is the characterization of {sup 60}Co beams and the {sup 137}Cs irradiator Shepherd 81-14D acquired by the National Metrology Laboratory of Ionising Radiation of the Institute of Radiation Protection and Dosimetry (LNMRI /IRD), for use in calibration of measuring instruments of gamma radiation in air kerma and ambient dose equivalent, irradiation of films and TLD's. Field homogeneity measurements were carried out, calculated input and output time of the source and commissioning of sources. (author)

  8. Preparation and characterization of Pt Sn / C-rare earth and PtRu / C-rare earth using an alcohol reduction process for ethanol electron-oxidation; Preparacao e caracterizacao de eletrocatalisadores PtSn/C-terras raras e PtRu/C-terras raras para a eletro-oxidacao do etanol

    Energy Technology Data Exchange (ETDEWEB)

    Rodrigues, Rita Maria de Sousa

    2011-07-01

    The electro catalyst PtRu / C-rare earth and PtSn/C-rare earth (20 wt%) were prepared by alcohol reduction method using H{sub 2}PtCl{sub 6}.6H{sub 2}O Ru Cl xH{sub 2}O, SnCl{sub 2}.2H{sub 2}O as a source of metals 85 % Vulcan - 15 % rare earth as a support and, finally, ethylene glycol as reducing agent. The electrocatalysts were characterized physically by X-ray diffraction (XRD), energy dispersive X-ray (EDX), and transmission electron microscopy (TEM). Analyses by EDX showed that the atomic ratios of different electrocatalysts, prepared by alcohol reduction method are similar to the nominal starting compositions indicating that this methodology is promising for the preparation of electrocatalysts. In all the XRD patterns for the prepared electrocatalysts there is a broad peak at about 2{theta} = 25{sup o}, which is associated with the carbon support and four additional diffraction peaks at approximately 2{theta} = 40{sup o}, 47{sup o}, 67{sup o} e 82{sup o}, which in turn are associated with the plans (111), (200), (220) e (311), respectively, of face-centered cubic structure (FCC) platinum. The results of X-ray diffraction also showed average crystallite sizes between 2.0 and 4.0 nm for PtSn e 2,0 a 3,0 para PtRu. The studies for the electrochemical oxidation of ethanol in acid medium were carried out using the technique of chronoamperometry in a solution 0,5 mol.L-1 H{sub 2}SO{sub 4}, + 1,0 mol.L-1 de C{sub 2}H{sub 5}OH. The polarization curves obtained in the fuel cell unit, powered directly by ethanol, are in agreement with the results of voltammetry and chronoamperometry noting the beneficial effect of rare earths in the preparation of electrocatalysts and attesting that the electrocatalysts PtSn/C are more effective than PtRu/C for the oxidation of ethanol.

  9. Preparation and characterization of PVA/SSA membranes with Al{sub 2}O{sub 3} nanoparticles for fuel cell applications; Preparacao de caracterizacao de membranas de PVAL/SSA na presenca de nanoparticulas de Al{sub 2}O{sub 3} para aplicacao em celulas de combustivel

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Paula N.; Pires, Alfredo T.N. [Grupo de Estudo em Materiais Polimericos - POLIMAT - UFSC, Florianopolis, SC (Brazil); Catarino, Margarida; Brandao, Lucia; Tanaka, Alfredo; Mendes, Adelio [Faculdade de Engenharia da Universidade do Porto, Porto (Portugal)

    2011-07-01

    In the present study, PVA/SSA membranes were prepared with and without the addition of Al{sub 2}O{sub 3} nanoparticles. Sulfosuccinic acid (SSA) was used as the crosslinking agent. Membranes were prepared with different amounts of SSA (26, 43 and 55 wt.%) and with 5 and 10 wt.% of nanoparticles. Crosslinking was performed at 90 degree C during 1.5 h. Membranes were analyzed by infrared spectroscopy, thermal analysis, water absorption, ion exchange capacity (IEC) and proton conductivity. The results showed that control of the crosslinking conditions, IEC value, water absorption and polymer structure are of significant importance to obtain a set of properties suitable for application in proton exchange membrane fuel cells. (author)

  10. XRD (X-Ray Diffraction) and nitrogen adsorption characterization of Ni-Pt/mordenite catalysts; Caracterizacao por EDX (Espectrometria de Raios-X), DRX (Difracao de Raios-X) e adsorcao de nitrogenio de catalisadores Ni/Pt/mordenita visando sua aplicacao na isomerizacao de n-hexano

    Energy Technology Data Exchange (ETDEWEB)

    Martins, Geovana do Socorro V.; Sousa, Bianca V.; Rodrigues, Meiry Glaucia F. [Universidade Federal de Campina Grande (UFCG), PB (Brazil)

    2008-07-01

    The search for molecules of high octane arose great interest in the isomerization processes. Catalysts to the zeolite base have been wide developed for the n-paraffins isomerization. In this work, bimetallic bifunctional catalysts supported on Mordenite zeolite were prepared samples containing 60Pt40Ni (wt.%) metal (Pt). The catalysts were obtained by competitive ion exchange using aqueous solutions of [Pt(NH{sub 3}){sub 4}]Cl{sub 2} and Ni(NH{sub 3}){sub 6}]Cl{sub 2} complexes. The EDS characterization analyses showed incorporation of the nickel and platinum mordenite zeolite. The diffractograms showed competitive ion exchange and calcination processes did not provoke appreciable changes in the zeolitic support framework. The peaks attributed to nickel and platinum oxides was possible to observe in the bimetallic catalysts 60Ni40Pt/MOR. The results of the N{sub 2} physical adsorption of the 60Ni40Pt/MOR showed that it did not have modification in the superficial area of the catalysts. (author)

  11. Development of an optimized algorithm for the characterization of microflow using speckle patterns present in optical coherence tomography signal; Desenvolvimento de um algoritimo otimizado para caracterizacao de fluxos microfluidicos utilizando padroes de speckle presentes no sinal de tomografia por coerencia optica

    Energy Technology Data Exchange (ETDEWEB)

    Pretto, Lucas Ramos de

    2015-07-01

    This work discusses the Optical Coherence Tomography system (OCT) and its application to the microfluidics area. To this end, physical characterization of microfluidic circuits were performed using 3D (three-dimensional) models constructed from OCT images of such circuits. The technique was thus evaluated as a potential tool to aid in the inspection of microchannels. Going further, this work paper studies and develops analytical techniques for microfluidic flow, in particular techniques based on speckle pattern. In the first instance, existing methods were studied and improved, such as Speckle Variance - OCT, where a gain of 31% was obtained in processing time. Other methods, such as LASCA (Laser Speckle Contrast Analysis), based on speckle autocorrelation, are adapted to OCT images. Derived from LASCA, the developed analysis technique based on intensity autocorrelation motivated the development of a custom OCT system as well as an optimized acquisition software, with a sampling rate of 8 kHz. The proposed method was, then, able to distinguish different flow rates, and limits of detection were tested, proving its feasibility for implementation on Brownian motion analysis and flow rates below 10 μl/min. (author)

  12. Study and characterization of the hexa ferrite Ba{sub 2}Co{sub 2}Fe{sub 12}O{sub 22} (Co{sub 2}-Y); Sintese e caracterizacao da hexaferrita Ba{sub 2}Co{sub 2}Fe{sub 12}O{sub 22} (Co{sub 2}-Y)

    Energy Technology Data Exchange (ETDEWEB)

    Pires Junior, G.F.M.; Rodrigues, H.O. [Universidade Federal do Ceara (DETI/UFC), Fortaleza, CE (Brazil). Dept. de Teleinformatica; Sales, J.C [Universidade Estadual Vale do Acarau (UVA), Fortaleza, CE (Brazil). Dept. de Engenharia; Sancho, E.O. [Universidade Federal do Ceara (UFC), Fortaleza, CE (Brazil). Dept. de Engenharia de Materiais; Sombra, A.S.B. [Universidade Federal do Ceara (LOCEM/UFC), Fortaleza, CE (Brazil). Dept. de Fisica. Lab. de Telecomunicacoes e Ciencias e Engenharia de Materiais

    2009-07-01

    The objective of this work is to synthesize and to characterize the Hexaferrita Ba2Co{sub 2}Fe{sub 12}O{sub 22} (Co{sub 2}Y). The Y-type Hexaferrita (Co{sub 2}Y) was prepared by the ceramic conventional method. The mixed powder by 1 h was calcined at 1050 deg C for 3 h. After of the calcination the powders were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) using a diffractometer DMAXB of the Rigaku (Japan), CuK{sub {alpha}} radiation ({lambda}=1.5405 angstrom) in a tax of 0.5 deg /min and linear band (20 deg at 80 deg) in 2{theta}. The characterization more detailed by XRD was made using the DBWS9807a program that uses the method of Rietveld for refinement of crystalline structures and confirmed the isolated attainment of the phase (Co{sub 2}Y) with hexagonal crystalline structure (a = b = 5,8560 angstrom and c = 43,4977 angstrom; {alpha} = {beta} = 90 deg and {gamma} = 120 deg) with density and volume of the unit cell calculated of 5.45 g/cm{sup 3} and 1292,3 angstrom respectively. (author)

  13. Synthesis and characterization of nano structures of Silica SBA-16 containing Gadolinium-159 as potential nanoparticulated system for cancer therapy; Sintese e caracterizacao de nanoestruturas de Silica SBA-16 contendo Gadolinio-159 como potencial sistema nanoparticulado para o tratamento do cancer

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Andre Felipe de

    2013-07-01

    Cancer is a leading cause of death worldwide, and malignant neoplasms of the lung, stomach, liver, colon and breast in greater numbers. And recently observed in the literature a large number of reviews where new materials, especially nanoparticle, has been studied as drug carriers and radioisotopes applied to cancer treatment. How mesoporous materials based on silica, thanks to its huge surface area and biocompatibility, have been studied intensively providing broad applications in various areas, the use of nanostructured silica SBA-16 might be a carrier specific radioisotope accumulate in the cells malignant. Thus the aim of this study is to develop in vitro studies using SBA-16 can selectively concentrate in malignant cells therapeutic amounts of the radioisotope Gadolinium-159 escorting them to death. This work was performed orderly synthesis of mesoporous silica, SBA-16 and incorporating the complex Gd-DTPA-BMA, as well as chemical and structural characterization. The techniques used to analyze the occurrence of the incorporation of the gadolinium complex in the silica matrix were elemental analysis (CHN), atomic emission spectroscopy (ICP-AES), infrared spectroscopy (FTIR), nitrogen adsorption (BET), small-angle X-ray scattering (SAXS) and thermogravimetric analysis (TG). To analyze the morphology of pure silica used the scanning electron microscopy (SEM) and transmission electron microscopy (TEM). By photon correlation spectroscopy (PCS) it was possible to obtain a measure of mean particle size, the polydispersity index (PDI) of the silica SBA-16, and the zeta potential by laser Doppler anemometry (LDA). The results of incorporation analyzed by ICP-AES indicated that the material SBA-16 had a higher rate of incorporation of gadolinium (93%). The release kinetics in simulated body fluid, showed considerable stability and low release (1%). The mesoporous silica SBA-16 showed cell viability in direct contact with cell culture. Samples with gadolinium incorporated in the silica matrix after irradiation showed no significant cytotoxic activity, implying that these studies should improved so that more research in nanobiotechnology are performed. (author)

  14. Chemical recycling of post-consumer PET: structural characterization of terephthalic acid and the effect of Alkaline Hydrolysis at low temperature; Reciclagem quimica do PET pos-consumo: caracterizacao estrutural do acido tereftalico e efeito da hidrolise alcalina em baixa temperatura

    Energy Technology Data Exchange (ETDEWEB)

    Fonseca, Talitha Granja; Almeida, Yeda Medeiros Bastos de; Vinhas, Gloria Maria, E-mail: gmvinhas@yahoo.com.br [Universidade Federal de Pernambuco (UFPE), Recife, PE (Brazil). Dept. de Engenharia Quimica

    2014-09-15

    Due to the environmental impact caused by PET packaging disposal, this material recycling has been thoroughly discussed and evaluated. In particular, chemical recycling enables achievement of the monomers that are used in PET resin manufacture: ethylene glycol (EG) and terephthalic acid (PTA). Therefore, studies for this process optimization are important from environmental and economic points of view. The present study investigated certain parameters that influence the depolymerization reaction of PET post-consumer via alkaline hydrolysis in order to obtain PTA. Assays were performed at 70 °C by varying the concentration of sodium hydroxide and the reaction time. The best results were obtained at 10.82 mol L{sup -1} NaOH and 9 h reaction time. Consequently, it was possible to prove this process viability, once analyses by infrared and nuclear magnetic resonance confirmed that PTA was obtained in all reactions performed. (author)

  15. Employment of MCNP in the study of TLDS 600 and 700 seeking the implementation of radiation beam characterization of BNCT facility at IEA-R1; Emprego do MCNP no estudo dos TLDS 600 e 700 visando a implementacao da caracterizacao do feixe de irradiacao da instalacao de BNCT do IEA-R1

    Energy Technology Data Exchange (ETDEWEB)

    Cavalieri, Tassio Antonio

    2013-07-01

    Boron Neutron Capture Therapy, BNCT, is a bimodal radiotherapy procedure for cancer treatment. Its useful energy comes from a nuclear reaction driven by impinging thermal neutron upon Boron 10 atoms. A BNCT research facility has been constructed in IPEN at the IEA-R1 reactor, to develop studies in this area. One of its prime experimental parameter is the beam dosimetry which is nowadays made by using activation foils, for neutron measurements, and TLD 400, for gamma dosimetry. For mixed field dosimetry, the International Commission on Radiation Units and Measurements, ICRU, recommends the use of pair of detectors with distinct responses to the field components. The TLD 600/ TLD 700 pair meets this criteria, as the amount of {sup 6}Li, a nuclide with high thermal neutron cross section, greatly differs in their composition. This work presents a series of experiments and simulations performed in order to implement the mixed field dosimetry based on the use of TLD 600/TLD 700 pair. It also intended to compare this mixed field dosimetric methodology to the one so far used by the BNCT research group of IPEN. The response of all TLDs were studied under irradiations in different irradiation fields and simulations, underwent by MCNP, were run in order to evaluate the dose contribution from each field component. Series of repeated irradiations under pure gamma field and mixed field neutron/gamma field showed differences in the TLD individual responses which led to the adoption of a Normalization Factor. It has allowed to overcome TLD selection. TLD responses due to different field components and spectra were studied. It has shown to be possible to evaluate the relative gamma/neutron fluxes from the relative responses observed in the two Regions of Interest, ROIs, from TLD 600 and TLD 700. It has also been possible to observe the TLD 700 response to neutron, which leads to a gamma dose overestimation when one follows the ICRU recommended mixed field dosimetric procedure. Dose response curves were obtained for the distinct types of TLDs for pure gamma and mixed fields. This work recommends the TLD 600/TLD 700 pair methodology for mixed field dosimetry, due to present a better precision than the one based on TLD 400, however one has to be careful to avoid gamma dose super estimation. (author)

  16. Characterization of clays found in soils of the indian territories in Rio Grande do Sul State by using the {sup 57} Fe Moessbauer spectroscopy; Caracterizacao de argilas encontradas em solos de terras indigenas do RS com o auxilio da espectroscopia Moessbauer de {sup 57} Fe

    Energy Technology Data Exchange (ETDEWEB)

    Perez, C.A.S.; Gobbi, D.; Marcos, J.L.N. [Universidade de Passo Fundo, RS (Brazil), Inst. de Ciencias Exatas e Geociencias; Paduani, C. [Santa Catarina Univ., Florianopolis, SC (Brazil). Dept. de Fisica; Ardisson, J.D. [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN), Belo Horizonte, MG (Brazil)

    2004-06-01

    Clay samples collected from soils of indian territories of the middle plateau in Rio Grande do Sul were analyzed with the aim to obtain characterization data and technical parameters for their potential use as raw material for ceramic products. The mineralogical study in samples by using the X-ray diffraction technique demonstrated that the predominant clay mineral is kaolinite. Others minerals as quartz and rutile also are present in small amounts. Chemical analysis shows low percentages for oxides of Mg, Mn, K, Na, Ca, Cu and Zn (overall percentages smaller than 0.97%). The samples also were analyzed with the {sup 57} Fe Moessbauer spectroscopy. The Moessbauer spectra at room temperature confirm the presence of the mineral kaolinite. At 77 K they reveal the existence of the minerals goethite and hematite as ultrafine magnetic particles in a superparamagnetic state. The physical tests performed in the samples show that these soils are very fine material and present appropriate granulometric characteristics and plasticity, which can be taken in advantage for the production of materials for construction or production of ornamental artifacts. (author)

  17. Characterization of kaolin wastes from kaolin mining industry from the amazon region as raw material for pozzolans production; Caracterizacao dos residuos cauliniticos das industrias de mineracao de caulim da amazonia como materia-prima para producao de pozolanas de alta reatividade

    Energy Technology Data Exchange (ETDEWEB)

    Barata, M.S.; Angelica, R.S., E-mail: msb@amazon.com.br, E-mail: angelica@ufpa.br [Instituto de Geociencias, Universidade Federal do Para, Belem, PA (Brazil)

    2012-01-15

    Capim and Jari are the two most important kaolin mining districts of the Brazilian Amazon region. They encompass the major Brazilian reserves of high quality kaolin for the paper coating industry. The kaolin is mined and processed by three major companies responsible for about 500,000 ton of a residue mainly composed of kaolinite. The wastes come mainly from the centrifugation phase of the kaolin beneficiation process and their final destinations are huge sedimentation basins that occupy large areas. The main purpose of this work is to evaluate the physical, chemical and mineralogical characteristics of the kaolin wastes processed from the Capim and Jari region, in order to obtain meta kaolinite, a high reactive pozzolans for the cement industry. When incorporated to ordinary Portland cement such pozzolans increases the concrete and mortars performance. All the residues studied in this work were characterized by means of: X-ray diffraction analysis, differential thermal analysis, infrared spectroscopy, scanning electron microscopy, X-ray fluorescence spectrometry and laser diffraction. Both residues are mainly constitutes by at least 92% of low granulometry kaolinite with specific surface area above 8 m2 /g and mean diameter below 1 {mu}m. Free silica (quartz) contents are below 3%. The high concentration of kaolinite in these residues dispenses rigid control parameters for removal of impurities usually employed in pozzolans production. The Jari kaolin exhibits high disordered kaolinite in comparison with the high ordered kaolinite of the Capim region and gives rise to higher desidroxilation degree at lower temperatures. It points to energy saving and reducing costs during the production of a pozzolans. The results are satisfactory and reveal that both kaolin wastes are excellent raw material for the production of high reactive meta kaolin. (author)

  18. Study and characterization of ceramic materials from natural origin for application in jewellery design using laser texturing as innovation; Estudo e caracterizacao de materiais ceramicos de origem natural para aplicacao no design de joias utilizando a texturizacao a laser como diferencial de inovacao

    Energy Technology Data Exchange (ETDEWEB)

    Elesbao, T.R.; Carus, L.A.; Tabarelli, A.C.; Vieira, R.P.; Takimi, A.S., E-mail: taianeelesbao@hotmail.com [Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS (Brazil). Departamento de Materiais

    2012-07-01

    Technological development has been largely responsible for changes in the jewelry market. Seeking to contribute to the development of new products, this study analyzed the technique of laser texturing, aiming to add commercial and aesthetic values to the mother of pearl, material used in the jewelry field. The methodology was divided into physico-chemical characterization of the mother-of-pearl and of the resulting residue of laser texturing and analysis of the interaction of laser with the surface of the mother-of-pearl. The characterizations carried out were: Infrared spectroscopy, X-ray diffraction, thermogravimetric analysis and scanning electron microscopy. Results indicate that the studied material is composed mainly by the aragonite crystal phase, different from that resulting residue from texturing process. Although the process remove some of the gem material, the effect water characteristic of the mother-of-pearl is maintained, suggesting that technology combined with research and design can increase the value of this material. (author)

  19. Stability evaluation and chemical characterization of different vegetable oils viewing the search for candidates for certified reference materials for bio diesel; Avaliacao da estabilidade e caracterizacao quimica de diferentes oleos vegetais visando a busca de candidatos a materiais de referencia certificado (MRC) para biodiesel

    Energy Technology Data Exchange (ETDEWEB)

    Cruz, Georgiana F. da; Fonseca, Mauricio G.; Goncalves, Lenise V.F.; Silva, Regina Celia F. da; Silva, Fernanda M.R. da; Rodrigues, Janaina M. [Instituto Nacional de Metrologia, Normalizacao e Qualidade Industrial (LABOR/INMETRO), Duque de Caxias, RJ (Brazil). Lab. de Analises Organicas; Leal, Rodrigo V.P. [Instituto Nacional de Metrologia, Normalizacao e Qualidade Industrial (LAMBOC/INMETRO), Duque de Caxias, RJ (Brazil). Lab. de Motores, Combustiveis e Lubrificantes], Email: rvleal@inmetro.gov.br; Cunha, Valnei S. [Instituto Nacional de Metrologia, Normalizacao e Qualidade Industrial (DIMCI/INMETRO), Duque de Caxias, RJ (Brazil). Diretoria de Metrologia Cientifica e Industrial

    2009-07-01

    Viewing the characterization of the various vegetable oils aiming to obtain a data bank that allows the production of certified reference materials for bio diesel of different blends, a study of chemical-physical characterization of different oils and derivative of bio diesel.

  20. Stratigraphy sequence analysis application for multi scalar characterization of paralic reservoirs - an example in the Guata group (E O-Permian) of the Parana Basin, in the state of Rio Grande do Sul, Brazil; Aplicacao da estratigrafia de sequencias para caracterizacao multiescalar de reservatorios paralicos - um exemplo no Grupo Guata (EO-Permiano) da Bacia do Parana, no Rio Grande do Sul, Brasil

    Energy Technology Data Exchange (ETDEWEB)

    Kuechle, Juliano [Rio Grande do Sul Univ., Porto Alegre, RS (Brazil). Inst. de Geociencias. Curso de Pos-graduacao em Geociencias]. E-mail: juk666@zipmail.com.br; Holz, Michael [Rio Grande do Sul Univ., Porto Alegre, RS (Brazil). Inst. de Geociencias]. E-mail: michael.holz@ufrgs.br

    2003-07-01

    Detailed stratigraphic analysis of the Early Permian Rio Bonito and Palermo Formations of the Parana Basin in the region of Sao Gabriel County has been used for a study on reservoir characterization of paralic sandstones. Two main depositional systems were recognized, a fluvial-dominated delta system and a wave-dominated barrier island system. The succession is divided in two third-order depositional sequences, enclosing thirteen fourth-order para sequences. This high-resolution stratigraphic framework was the base for a multi scale approach on reservoir characterization of the sandstone bodies. Reservoir heterogeneities are discussed, staring from the scale of depositional sequence (heterogeneity level 1), passing down to heterogeneity at the scale of systems tracts (heterogeneity level 2) and finalizing with an approach at para sequence scale (heterogeneity level 3). Main control on heterogeneity at the first level is base-level variation as generating mechanism for un conformities at the sediment type and rate. At the second level, the reservoir heterogeneity is controlled by the lateral and vertical variations in thickness of particular systems within the different systems tracts, and at the third level, the heterogeneity occurs controlling reservoir continuity and connectivities between reservoirs. The study supplies a model which is useful as a predictive tool for similar geologic settings in producing oil fields. (author)

  1. Thermal, mechanics and electrical characterization of the Al-0,6%Mg-08%Si alloy refined and modified with different copper contents; Caracterizacao termica, mecanica e eletrica da liga Al-0,6% Mg-0,8% Si refinada e modificada com diferentes teores de cobre

    Energy Technology Data Exchange (ETDEWEB)

    Freitas, E.S. [Universidade Federal do Para (UFPA), Belem, PA (Brazil)], Email: mmanufreitas@gmail.com; Marques, P.R.R.; Santos, W.L.R.; Kamizono, K.A.; Quaresma, J. Maria V.

    2009-07-01

    The aluminum, magnesium and silicon alloys form a very important group, utilized as casted form and worked alloys, especially in 6201 alloy series. These alloys show applicability on cables and wires fabrication to electrical energy transmission. The present work analyzes the copper content variation and its influence in electrical conductivity, tensile strength and in studied alloy ductility. The refined Al-0,6% Mg-0,8% Si studied alloy was modified with the following contents: [0,05; 0,10; 0,20 e 0,30]% Cu and unidirectional solidified. The test specimen were machined to 10 mm diameter and rolled to 3,98 mm, whose deformation rate was 60,2%. The obtained wires were mechanical, electrical and structural characterized and the mechanical and electrical characterization results were associated to fractures of evaluated micro cavities. The highest observation was the Cu content in alloy increases the TS, decreases electrical conductivity and increases liquidus isotherm's velocity, forming micro cavities. (author)

  2. Yb{sup 3+}:Sr{sub 5}(VO{sub 4}){sub 3}F: Crystal growth, spectroscopic characterization and laser development; Yb{sup 3+}:Sr{sub 5}(VO{sub 4}){sub 3}F: Crescimento, caracterizacao espectroscopica e desenvolvimento do laser

    Energy Technology Data Exchange (ETDEWEB)

    Bustamante, Andrea Nora Pino

    1999-07-01

    Crystal growth, spectroscopic characterization and laser development of Yb{sup 3+}:SVAP [Sr{sub 5}(VO{sub 4}){sub 3}F] was performed to demonstrate for the first time, operation of tunable laser emission centered at 1120 nm. Initially, SVAP crystals were grown with high dopant concentrations, up to 6.0 mol % of Yb{sub 2} O{sub 3} in the melt, in order to investigate the material for potential laser operation at a new laser wavelength. Additional research was performed to alleviate highly doped SVAP crystals of defects previously observed. Basic spectroscopic characterization including absorption and luminescent properties were measured to better understand the behavior of Yb{sup 3+} ions in SVAP. Based upon these studies, discussion of the 1120 nm laser transition is presented as it arises from a ground state vibrational level. Investigations of the charge compensation process and the optical parameters as a function of dopant concentration are also presented. The laser development of Yb{sup 3+}:SVAP included continuous and pulsed modes of operation of the 1044 nm and 1120 nm transitions. Initial laser action of the 1044 nm transition was achieved using a Yi: Saphire laser pump source in order to compare with previously results. Further development of a diode-pumped Yb{sup 3+}:SVAP laser system demonstrated continuously tunable laser operation from 1103 nm for the first time. The laser investigations also proved that this high gain media does provide continuous wave laser action at 1044 nm and 1120 simultaneously without significant gain depletion. (author)

  3. Characterization of Zn-bearing chlorite by Moessbauer and infrared spectroscopy - occurrence associated to the Pb-Zn-Ag deposits of Canoas, PR, Brazil; Caracterizacao de clorita portadora de Zn por espectroscopia Moessbauer e espectroscopia infravermelho - uma ocorrencia associada ao deposito de Pb-Zn-Ag de Canoas, PR, Brasil

    Energy Technology Data Exchange (ETDEWEB)

    Imbernon, Rosely Aparecida Liguori [Universidade de Sao Paulo (EACH/USP), SP (Brazil). Escola de Artes, Ciencias e Humanidades; Blot, Alain [Institut de Recherche pour le Developpement (IRD), Paris (France); Pereira, Vitor Paulo [Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS (Brazil). Inst. de Geociencias; Franco, Daniel Ribeiro, E-mail: imbernon@usp.br, E-mail: brotalain@free.fr, E-mail: vitor.pereira@ufrgs.br, E-mail: drfranco@on.br [Observatorio Nacional do Brasil (COGE/ON), Rio de Janeiro, RJ (Brazil). Coordenacao de Geofisica

    2011-06-15

    In order to provide new insights on mineralogical aspects of geochemical mapping/natural processes related to the chlorite formation (e.g. crystallochemistry and mechanisms of formation of these materials, which has been applied in different studies of environmental profiles), we investigated chlorite samples associated to the Pb-Zn-Ag sulfide ore from Canoas 1 deposit (Vale do Ribeira, state of Parana, Brazil). By means of Moessbauer (MS) and infrared (IV) spectroscopy, we addressed some issues as those related to the chloritization processes, as well as how Zn would be incorporated into its crystalline structure. Results carried out by ME and IV spectroscopy clearly pointed out for a chlorite occurrence, which in fact incorporates Zn into its structure and also alters the structural patterns for this mineral. Moreover, ME data sets indicated the presence of Fe which is located only in octahedral sites, in trans-configuration, and the Zn emplacement by the chloritization process also occurs in the brucite layer. (author)

  4. Synthesis and characterization of inorganic ion exchangers based on mixed oxide tin-titanium to be used in recovery of cadmium and nickel and photoluminescent studies; Sintese e caracterizacao de trocadores ionicos inorganicos a base de oxidos mistos estanho-titanio para utilizacao na recuperacao de cadmio e niquel e estudos fotoluminescentes

    Energy Technology Data Exchange (ETDEWEB)

    Paganini, Paula Pinheiro

    2007-07-01

    This work presents the synthesis, characterization and adsorption studies of inorganic ion exchangers based on mixed tin-titanium oxide for recovery of cadmium and nickel metals from aqueous effluents, discarded in the environment mainly through Ni-Cd battery. The exchangers were synthesized by sol-gel modified method using a mixture of tin(IV) chloride and titanium(III) chloride and ammonium hydroxide, as precursors reagents. The materials obtained: SnO{sub 2}/TiO{sub 2} and SnO{sub 2}/TiO{sub 2}:Eu{sup 3+} were characterized by infrared spectroscopy, thermal analysis, scattering electronic microscopy (SEM), X-ray powder diffraction (XRD) (powder method) and electronic spectroscopy (excitation and emission) for the europium doped exchanger. The same materials also were synthesized in polymeric matrix too and can be used in column, because the synthesized materials showed crystals size in nano metric scale. It was determined by the distribution ratios for metals taking as parameters the influence of pH, the concentration of metals (by adsorption isotherms) and the contact time (by adsorption kinetic). The inorganic ion exchanger presented high exchange capacity with adsorption percent above 90 por cent for the studied conditions, quickly kinetic, heterogeneous exchange surfaces, physic adsorption and spontaneous process of exchange. To the doped exchanger spectroscopy properties were studied and also it was calculated the intensity parameters and it was found a satisfactory quantum yield. (author)

  5. Development and characterization of monolithic fuel miniplate alloy U-2.5Zr-7.5Nb, coated in zircaloy; Desenvolvimento e caracterizacao do combustivel nuclear tipo placa monolitico da liga U-2,5Zr-7,5Nb revestido em zircaloy

    Energy Technology Data Exchange (ETDEWEB)

    Machado, Geraldo Correa

    2014-06-01

    The autocthonal production of nuclear fuel in Brazil for test and research reactors is restricted to MTR (Material Test Reactor) fuel type dispersion plate, using U3Si2 alloy, coated and dispersed in aluminum, developed by IPEN-SP for use in IEA-R1 reactor. Moreover, the UO{sub 2} fuel rod type for power reactors is manufactured by Rezende (RJ) with a German technology by INB under license. Currently, Brazil is performing two programs of developing reactors. Currently, Brazil is developing two reactors. One of them is the development, by CNEN, the Brazilian Multipurpose Reactor (RMB), for testing, research and radioisotope production. The other one is the development a power reactor for naval propulsion, conducted by the Brazilian Navy. This dissertation presents the development and characterization of monolithic fuel miniplate alloy U-2.5Zr-7.5Nb, coated in zircaloy (ZRY), on a laboratory scale. Due to its innovative features and properties, this fuel can be used as fuel in both test reactors, research and producing radioisotopes for power reactors as small and medium sizes. Thus, this high potential fuel can be used in domestic reactors currently under development. The development of monolithic fuel plate type is made using the technique called 'picture-frame' where a sandwich composed of a monolith alloy U-2.5Zr- 7.5Nb coupled to a frame and coated sheets of Zry is obtained. The alloy U-2.5Zr-7.5Nb was obtained by melting in an induction furnace and then was cast into rectangular ingots of graphite, thus achieving an ingot with approximate dimensions of 170 x 50 x 60 mm. The obtained ingot was hot rolled at 850 ºC, with a 50 % reduction in thickness, in order to refine the raw structure of fusion. Samples cut from the alloy U-2.5Zr-7.5Nb, with dimensions 20 x 20 x 6 mm were placed in frames and plates Zry and joined by TIG (Tungsten Inert Gas) under an atmosphere of argon, obtaining a set of 10 mm thick, 45 mm wide and 100 mm long. The sandwiches were hot rolled to achieve miniplates with a thickness of 2mm. Finally, the miniplates were cold rolled, with a total reduction of 10%, with a final thickness of 1.8 mm. The alloy U-2,5Zr-75Nb was characterized by physical and microstructural techniques Vickers microhardness, phase analysis by X-ray diffraction and microstructure by optical and scanning electron microscopy. The miniplate was characterized by physical and microstructural techniques of X-ray radiography, blistering test, bending test, analysis of metallurgical union of meat and coating spectrometric energy dispersive X-ray, microstructure by optical and scanning electron, phase analysis of the meat by X-ray and Vickers microhardness. It was possible to obtain the alloy U-2.5Zr-7.5Nb with retained γ phase and low carbon content. Miniplates obtained by hot and cold rolling process showed vii good results as colamination between core/cladding and between their coats, retention of γ phase in the alloy remained after the process. (author)

  6. Studies of the development and characterization of the Cu-Ni-Pt and Cu-Ni-Sn alloys for electro-electronic uses; Estudos do desenvolvimento e caracterizacao das ligas Cu-Ni-Pt e Cu-Ni-Sn para fins eletro-eletronicos

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Luis Carlos Elias da

    2006-07-01

    The Cu and its alloys have different applications in the owed modern society the excellent electric properties, thermal conductivity, resistance to the corrosion and other properties. These applications can be in valves, pipes, pots for absorption of solar energy, radiators for automobiles, current driver, electronic driver, thermostats elements and structural parts of nuclear reactors, as, for example, reels for field toroidal for a reactor of nuclear coalition. The alloys used in nuclear reactors, we can highlight Cu-Be, Cu-Sn and Cu-Pt. Ni and Co frequently are added to the Cu alloys so that the solubility is moved for temperatures more elevated with relationship to the binary systems of Cu-Sn and Cu-Pt. The addition of Ni-Pt or Ni-Sn to the Cu in the same or inferior percentages to 1,5% plus thermomechanical treatments changes the properties of the copper. We studied the electric conductivity and hardness Vickers of the Cu-Ni-Pt and Cu-Ni-Sn and compared with the electrolytic Cu. In the proposed flowcharts, breaking of the obtaining of the ingot, we proceeded with thermo mechanical treatments. (author)

  7. Synthesis and characterization of nanostructured powders of hydroxyapatite and of three-calcium {beta} phosphate: elaboration of two phase compositions for application in the orthopedics and traumatology; Sintese e caracterizacao de pos nanoestruturados de hidroxiapatita e de fosfato tricalcico {beta}: elaboracao de composicoes bifasicas para aplicacoes na ortopedia e traumatologia

    Energy Technology Data Exchange (ETDEWEB)

    Dalmonico, G.M.L.; Pinheiro, D.M.; Camargo, N.H.A.; Orzechowki, L.G.; Goncalves, A.F.; Melnik, V.; Jesus, J.; Gemelli, E. [Universidade do Estado de Santa Catarina (UDESC), Joinville, SC (Brazil). Centro de Ciencias Tecnologicas], e-mail: gidalmonico@gmail.com

    2010-07-01

    This paper synthesized nano structured hydroxyapatite and three calcium {beta} phosphate, for elaboration of two phase compositions of HA/TCP in the concentration in volume of 80% HA/20% TCP-{beta}, 60% HA/40% TCP-{beta} and 50% HA/50% TCP-{beta}. For phase mixing realization, the method of mechanical fragmentation by attritor mill were used. The material recovered from the process of mechanical fragmentation was dried in rotate evaporator, supplying the two phase compositions. The preliminary studies shown the obtention of nano metric powders and a good phase dispersions inside the two phase compositions. (author)

  8. Multi-wall carbon nanotubes/epoxy resin composites characterization of the starting materials and evaluation of thermal and electrical conductivity;Compositos resina epoxi/nanotubos de carbonos de paredes multiplas: caracterizacao dos materiais de partida e avaliacao das condutividades eletrica e termica

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Wellington Marcos da

    2009-07-01

    In this study we investigate the electrical and thermal properties of I) composite materials fabricated with O, I, 0,5 and I wt% of concentric multi-wall carbon nanotubes/epoxy resin (MWNT) dispersed randomly in the resin; 2) MWNT buckypaper/resin composite materials; 3) and neat MWNT buckypaper. Initially, we use the techniques of thermogravimetry, infrared spectroscopy, nuclear magnetic resonance, energy dispersive spectroscopy, x-ray fluorescence, scanning and transmission electron microscopy for a broadening characterization of the starting materials, to evaluate its morphology, purity, chemical composition and structure, in order to optimize the properties of crosslinked resin and, consequently, of the composite systems. Important parameters such as the average molecular mass and the equivalent weight of epoxy resin (DGEBA) were determined by {sup 1}H-NMR analysis and, after that, resin/curing agent relations with Phr 10, 15, 20 and 53,2 were elaborated and investigated by thermogravimetry, the resin/curing agent relation with Phr 10 showed to be the most thermally stable. This stoichiometric relation was used to elaborate the composites. We have evaluated that the effect of adding 10 wt% of the solvent acetone to the epoxy resin preparation does not alter its properties so we have adopted two routes to fabricate the composites. In the first route we used 10 wt% of acetone and, in the second the MWNT were dispersed in the matrix without using the solvent. However, no significant difference was observed for the dispersion of the bundle tubes in both systems. The electrical conductivity of the composites and buckypapers was evaluated by impedance spectroscopy and the thermal conductivity by the flash laser flash method. Only the buckypapers presented high values for electrical conductivity (10{sup 3} S.m{sup -1}). The composite systems presented values of 10{sup -3} S.m{sup -1}, only a bit different from the value of the crosslinked resin. For thermal conductivity, the values for the composite systems were below the determined value for the crosslinked resin. (author)

  9. Structural and morphological characterization of TiO{sub 2}-ZrO{sub 2} powders obtained by the polymeric precursors method; Caracterizacao estrutural e morfologica de pos de TiO{sub 2}-ZrO{sub 2} obtidos pelo metodo dos precursores polimericos

    Energy Technology Data Exchange (ETDEWEB)

    Ribeiro, M.A.; Gama, L.; Bispo, A.; Neiva, L.S., E-mail: m_aparecidaribeiro@yahoo.com.b [Universidade Federal de Campina Grande (DEMa/UFCG), PB (Brazil). Dept. de Engenharia de Materiais; Bernardi, M.I.B. [Universidade de Sao Paulo (IFSC/USP), Sao Carlos, SP (Brazil). Inst. de Fisica; Kiminami, R.H.G.A. [Universidade Federal de Sao Carlos (DEMa/UFSCar), SP (Brazil). Dept. de Engenharia de Materiais

    2010-07-01

    This work aims to characterize the structure and morphology of TiO{sub 2}-ZrO{sub 2} powders obtained by polymeric precursor method. For this we studied the following compositions: 0.25, 0.5 and 0.75 moles of Zr and calcined at 800 deg C for one hour. The powders obtained were characterized by XRD, SEM and nitrogen adsorption (BET). The analysis of X-ray diffraction showed that the powders had a phase of TiO{sub 2} in the anatase form and a tetragonal phase of ZrO{sub 2}. The crystallite size was between 8, 13 and 11 nm respectively. The analysis of scanning electron microscopy showed the growth of ZrO{sub 2} nanoparticles and that these comprise spherical agglomerates of less than 100 nm. Particle size determined by the BET ranging 28.1-29.5 nm, showing thereby the character of nanosized powders. (author)

  10. Characterization of cylinder liners produced with hypereutectic Al-Si alloys and investigation of corrosion behaviour in synthetic automotive condensed solution; Caracterizacao de camisas de cilindro em ligas Al-Si hipereuteticas e investigacao do comportamento de corrosao em meio de condensado sintetico automotivo

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Hamilta de Oliveira

    2006-07-01

    In the present study four hypereutectic Al-Si alloys, three produced by spray forming and one by casting, were characterized for microhardness, roughness, microstructure, texture and corrosion resistance in a synthetic automotive condensed solution (SACS). Two of the spray formed alloys tested were obtained from cylinder liners and the other was laboratory made. Spray forming involves alloy atomization and droplets deposition on a substrate, previous to the solidification of all of the droplets. This process favours the production of materials with a fine microstructure free of macrosegregation that is related to improved hot workability. The microstructure characterization of the four alloys revealed the presence of porosities in the laboratory made alloy. All the three alloys produced by spray forming showed a homogeneous distribution of primary precipitates. The microstructure of one of the alloys showed eutectic microstructure, indicating that this alloy was fabricated by casting. In the cylinder liners, the surface roughness was measured and the microhardness of all the alloys was also evaluated. Furthermore, the laboratory made alloy was hot and cold rolled. Texture determinations were carried out to investigate the correlation between the alloy type and their fabrication process. The texture investigation indicated that the fine distribution of primary silicon phase in the alloy hindered the development of texture typical of aluminium alloys deformation, even after severe mechanical work, such as those used in the conversion of pre-formed in cylinder liners. The surface roughness results indicated typical characteristics of the surface finishing used, honing or chemical etching. The microhardness results were dependent on the fabrication process used, with higher microhardness associated to the eutectic alloy comparatively to the spray formed ones. All hypereutectic alloys were tested for corrosion resistance using electrochemical impedance spectroscopy in two electrolytes, SACS with pH 3.3 and SACS with pH 11. The four tested alloys showed similar corrosion mechanisms in the acid electrolyte (SACS pH 3.3). The intense attack of the aluminium matrix occurred in ali tested alloys and the primary silicon phase was unattacked and appeared as emerging from the surface after corrosion immersion test. The primary silicon particles acted as cathodic sites. The alloy 2 showed the highest corrosion resistance among the tested alloys in both electrolytes, SACS pH 3.3 and SACS pH 11. In this last medium, a layer of corrosion products formed on all the alloys, and the results indicated different mechanisms for the aluminium matrix corrosive attack and growth of the deposited layer on the alloys surface. The kinetics of aluminium matrix attack was apparently slower in the alloy 2 than for the other alloys, resulting in the formation of a more compact layer of corrosion products, leading to diffusion controlled interfacial processes for longer test periods. The layer of corrosion products on the other three alloys (1, 3, and 4) had more defects and for these alloys diffusional controlled interfacial processes were not as significant as for alloy 2. (author)

  11. Association of bioassays and molecular characterization to select new Bacillus thuringiensis isolates effective against Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae); Associacao de bioensaios e caracterizacao molecular para selecao de novos isolados de Bacillus thuringiensis efetivos contra Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae)

    Energy Technology Data Exchange (ETDEWEB)

    Fatoretto, Julio C.; Sena, Janete A.D.; Lemos, Manoel V.F. [UNESP, Jaboticabal, SP (Brazil). Faculdade de Ciencias Agrarias e Veterinarias. Dept. de Biologia Aplicada a Agropecuaria; Barreto, Marliton R. [Universidade Federal do Mato Grosso (UFMT), Cuiaba, MT (Brazil). Inst. Universitario do Norte Matogrossense (IUNMAT)]. E-mail: mrbarreto@pop.com.br; Junior Boica, Arlindo L. (UNESP), Jaboticabal, SP (Brazil). Faculdade de Ciencias Agrarias e Veterinarias. Dept. de Fitossanidade)

    2007-09-15

    The fall armyworm, Spodoptera frugiperda (J. E. Smith), is one of the main corn pests and Bacillus thuringiensis is important in its control because of its entomopathogenic property. The objective of this study was the molecular characterization of B. thuringiensis isolates for cry1 locus presence and the assessment of the efficiency of these isolates in controlling S. frugiperda caterpillars. Gral-cry1 was used in the PCR analyses to confirm the presence of the cry1 locus in 15 isolates. A 3 x 108 spore/ml suspension bathed the diet used to feed 30 caterpillars per isolate, with three replications. The cry1 locus type genes of the different isolates were identified for five gene subclasses; linear regression analyses were carried out to ascertain possible associations between the presence of an individual cry1 locus gene and high levels of toxicity. All the DNAs amplified with Gral-cry1 presented an amplification product with the expected size. Regarding the levels of insecticide efficiency against the cob worm, 41 isolates presented 100% mortality and 16 presented an index between 70% and 90%. The cry1Ab gene was present in 80 isolates, cryb in 69 isolates, cry1Ac in all the isolates and cryv and cry1E in 93 and 27 isolates, respectively. The values regarding the individual effect of each gene on caterpillar mortality were significant at 1% probability for the cry1Ac and cry1E genes. (author)

  12. Synthesis and characterization of lanthanum manganite films for using in solid oxide fuel cells for operation at intermediate temperatures; Sintese e caracterizacao de filmes de manganita de lantanio para utilizacao em pilhas a combustivel de oxido solido para operacao em temperaturas intermediarias

    Energy Technology Data Exchange (ETDEWEB)

    Gama, L.M.; Paes Junior, H.R. [Laboratorio de Materiais Avancados - LAMAV - Universidade Estadual do Norte Fluminense - UENF, Campos dos Goytacazes, RJ (Brazil)

    2010-07-01

    This work aims to investigate the effects of doping and thermal processing of LaMnO{sub 3}, La{sub 0},{sub 8}Sr{sub 0},{sub 2}MnO{sub 3} e La{sub 0},{sub 8}Ca{sub 0},{sub 2}MnO{sub 3} films deposited by spray-pyrolysis technique on their structural, morphological and electrical properties, seeking its application as cathode in solid oxide fuel cells for operation in intermediate temperatures (IT-SOFC). These films were deposited on ferritic stainless steel type AISI 444. The thermal processing of the films was accomplished in air with treatment temperature of 900 degree or 1000 degree during 2 hours. The characterization by Xray diffraction revealed that the thermal processing propitiated the formation of the expected phases with the structure of perovskite. The analysis of surface morphology showed that doping provides an increase in porosity. Electrical characterization showed that Sr-doped films showed higher conductivity values and an activation energy of the conduction process of 0,41 eV. (author)

  13. Geochemistry and Nd-Sr isotopic signatures of the Pensamiento G