WorldWideScience

Sample records for avaliacao por metodos

  1. CONSERVACION DE MANZANAS GRANNY SMITH MINIMAMENTE PROCESADAS POR METODOS COMBINADOS

    OpenAIRE

    GALLEGUILLOS CANALES, PAMELA CRISTINA; GALLEGUILLOS CANALES, PAMELA CRISTINA

    2011-01-01

    Se ha demostrado que el consumo de frutas y hortalizas tiene un efecto beneficioso para la salud. Debido a su alto contenido de antioxidantes, constituye una de las maneras más efectivas para reducir el riesgo de enfermedades crónicas no transmisibles (Speisky, 2006; Block et al., 1992; Knekt et al., 1997; Ness y Powles, 1997; Doll, 1990; Wang et al., 1996; Del Caro et al., 2004). El aumento de muertes por enfermedades como cáncer, diabetes y enfermedades cardiovasculares, ha llevado a ent...

  2. Persistent hyperplastic primary vitreous: imaging evaluation; Persistencia hiperplastica do vitreo primitivo: avaliacao por metodos de imagem

    Energy Technology Data Exchange (ETDEWEB)

    Jacob, Beatriz Mahmud; Teixeira, Kim-Ir-Sen Santos; Figueiredo, Sizenildo da Silva; Nobrega, Bruno Barcelos da [Universidade Federal de Goias, Goiania (Brazil). Hospital das Clinicas. Dept. de Diagnostico por Imagem]. E-mail: biamjacob@hotmail.com

    2003-06-01

    Persistent hyperplastic primary vitreous (PHPV) is a congenital developmental anomaly of the eye that primarily affects premature infants. PHPV results from failure of regression of the embryogenic primary vitreous and hyaloid vasculature, and proliferation of connective tissue. Three types of PHPV may be found: anterior, posterior and a combination of anterior and posterior. The clinical findings include leukocoria (white pupillary reflex) and microphthalmic eye. This anomaly is usually unilateral and unassociated with other systemic findings. The differential diagnosis between PHPV and other ocular diseases may be difficult due to similar features such as leukocoria, detached retina, retinal folds and cataract. Other diseases with similar features include retinoblastoma, isolated congenital cataract, retinopathy of prematurity and pseudo gliomas or leukocorias. Direct visualization of the remnants of the fetal hyaloid vascular system offers the best evidence of PHPV. However, diagnosis using the ophthalmoscope is sometimes impossible because of opaque tissues. In this circumstance an indirect visualization by ultrasound, computed tomography or magnetic resonance imaging may be useful. These imaging methods provide valuable information for the differentiation from other diseases, particularly retinoblastoma. The authors present a review of the literature and an iconographic study of the imaging findings in patients with PHPV. (author)

  3. Intussusception in children: imaging evaluation and therapeutic approach; Intussuscepcao em criancas: avaliacao por metodos de imagem e abordagem terapeutica

    Energy Technology Data Exchange (ETDEWEB)

    Cunha, Fabio Motta da; Figueiredo, Sizenildo da Silva; Nobrega, Bruno Barcelos da; Monteiro, Soraya Silveira; Lederman, Henrique Manoel [Universidade Federal de Sao Paulo (UNIFESP/EPM), SP (Brazil). Dept. de Diagnostico por Imagem]. E-mail: brunoradiol@hotmail.com; Oliveira, Galba Leite [Irmandade Santa Casa de Misericordia de Sao Paulo, SP (Brazil). Dept. de Diagnostico por Imagem

    2005-05-15

    Intussusception is a medical emergency that occur with higher frequency in children under 2 years of age. Diagnosis can be difficult as the classical triad of abdominal pain, jelly stools and palpable abdominal mass is seen in less than 50% of the patients. However, the diagnosis of intussusception can be established with variable degree of accuracy using plain abdominal x-ray films, ultrasound, computed tomography or barium (or air/saline) enema. Some of these imaging methods are also useful during treatment of this condition. The authors present a review of the literature and a pictorial essay of the imaging findings in patients with intussusception. In addition, a discussion on the current and controversial issues related to the treatment of intussusception is presented. (author)

  4. Validation of Hiriart equation to compute steam production by the lip pressure method; Validacion de la ecuacion de Hiriart para calculo de gasto de vapor por el metodo de presion de labio

    Energy Technology Data Exchange (ETDEWEB)

    Flores Armenta, Magaly [Gerencia de Proyectos Geotermoelectricos de la Comision Federal de Electricidad, Morelia (Mexico)

    1996-09-01

    Mainly in new geothermal wells, it is necessary to evaluate the production in a very fast, simple and not expensive way, to know the convenience to install surface equipment, such as silencers and separators, to drive the steam to the commercial gathering system. In practice, one of the most known methods is the lip pressure one, which requires a simple set of installations. The objective of this paper is to validate the steam flow rate calculated by the lip pressure method, with respect to the ASME method. The ASME method is known for its accuracy, and is done by measuring the steam and liquid after a high pressure separator, by an orifice plate of known diameter and a triangular weir. Results of the validation show up the feasibility of application of the lip pressure method by using a simple adjustment equation. Percentage of mistake results less than 1%, without any notable influence of the production enthalpy. That equation to be applied in a general case, is as follows: Q{nu} =(20642)(F*P*D{sup 2}/{radical}h-2000). For the particular case of the Los Azufres geothermal field, the equation is: Q{nu}= 810*P*D{sup 2} [Espanol] En los pozos geotermicos, principalmente en los nuevos, es necesario evaluar su produccion de manera rapida, sencilla y economica, para determinar la conveniencia de instalar equipo superficial, como separadores, silenciadores, etc., que permita la integracion del vapor al sistema comercial de generacion electrica. Para fines practicos uno de los metodos mas conocidos es el de presion de labio, que solo requiere un arreglo sencillo de instalaciones superficiales. En este documento se validan y ajustan los calculos de produccion de vapor por ese metodo de presion de labio, con respecto a las mediciones exactas efectuadas con el metodo ASME. Este ultimo es reconocido internacionalmente por su precision, y se lleva a cabo separando la mezcla obtenida en superficie en un recipiente a presion para medir el vapor a traves de una placa de orificio

  5. Factors application of MW-mile method and participation in the allocation of charges by the drills use in electricity markets; Aplicacion de los factores de participacion y del metodo de MW-milla en la asignacion de cargos por uso de redes de transmision en mercados de electricidad

    Energy Technology Data Exchange (ETDEWEB)

    Alba-Gomez, L; Tovar-Hernandez, J. H; Gutierrez-Alcaraz, G [Instituto Tecnologico de Morelia, Michoacan (Mexico)]. E-mail: horaciotovar@mexico.com; ggutier@itmorelia.edu.mx

    2007-04-15

    Use of network allocation costs by shift factors and MW-Mile method is reported in this paper. Conventional shift factors are computed based on DC power flow. DC power flow requires to selecting a slack bus in order to avoid matrix singularity. Therefore, shift factors are slack bus dependent. In order to evade slack bus dependency, two approaches are considered. [Spanish] Este trabajo presenta la asignacion de costos por uso de red mediante la aplicacion de Factores de Participacion (FP) y el metodo de MW-Milla. Los FP clasicos son calculados a partir del modelo lineal de flujos de potencia para lo que se requiere de establecer un nodo de referencia a fin de eliminar la singularidad de la matriz de coeficientes. Por lo tanto, los FP son dependientes de la asignacion del nodo de referencia. Dos metodos alternativos para evitar la dependencia del nodo compensador en la obtencion de los factores de participacion son presentados.

  6. Metodo de quantificação de nucleotideos por HPLC-MS/MS e avaliação da atividade de analogos de sildenafil sobre fosfodiesterase

    OpenAIRE

    Raquel Lorenzetti

    2007-01-01

    Resumo: No presente trabalho foi padronizado um novo método para a dosagem da atividade de fosfodiesterase in vitro, por HPLC-MS/MS. Este novo método conseguiu apresentar exatidão, precisão, sensibilidade e rapidez nas análises; monitorando os nucleotídeos (AMP, GMP, AMPc e GMPc). O desenvolvimento de novos fármacos derivados de um protótipo aponta para a obtenção de moléculas com um melhor perfil farmacocinético ou uma melhor relação estrutura-atividade. Atualmente o sildenafil é considerad...

  7. Contents evaluation of some essential and toxic elements in children and elders diet by neutron activation analysis; Avaliacao do conteudo de alguns elementos essenciais e toxicos em dietas de criancas e idosos pelo metodo de analise por ativacao com neutrons

    Energy Technology Data Exchange (ETDEWEB)

    Maihara, Vera Akiko

    1996-12-31

    Essential and toxic elements in the 19 diet samples from pre-school children and 23 diet samples from elderly people, have been determined by neutron activation analysis. The diet samples were collected by duplicate portion method. A radiochemical separation procedure was developed and applied for determining Cd, Co, Cr, Fe, Mo, Sb, U, Th, W and Zn, based on retention of these elements in a Chelex-100 resin. In the case of As and Se, the procedure was based on retention in inorganic exchanger TDO (tin dioxide). The contents of proteins, lipids and carbohydrates were also analysed. The results have been presented and discussed 135 refs., 29 figs., 36 tabs.

  8. Contents evaluation of some essential and toxic elements in children and elders diet by neutron activation analysis; Avaliacao do conteudo de alguns elementos essenciais e toxicos em dietas de criancas e idosos pelo metodo de analise por ativacao com neutrons

    Energy Technology Data Exchange (ETDEWEB)

    Maihara, Vera Akiko

    1997-12-31

    Essential and toxic elements in the 19 diet samples from pre-school children and 23 diet samples from elderly people, have been determined by neutron activation analysis. The diet samples were collected by duplicate portion method. A radiochemical separation procedure was developed and applied for determining Cd, Co, Cr, Fe, Mo, Sb, U, Th, W and Zn, based on retention of these elements in a Chelex-100 resin. In the case of As and Se, the procedure was based on retention in inorganic exchanger TDO (tin dioxide). The contents of proteins, lipids and carbohydrates were also analysed. The results have been presented and discussed 135 refs., 29 figs., 36 tabs.

  9. Sacroiliitis: imaging evaluation; Sacroiliite: avaliacao por imagem

    Energy Technology Data Exchange (ETDEWEB)

    Montandon, Cristiano; Teixeira, Kim-Ir-Sen Santos [Clinicas da Imagem e Multimagem, Goiania, GO (Brazil); Costa, Marlos Augusto Bitencourt; Carvalho, Tarcisio Nunes; Montandon Junior, Marcelo Eustaquio [Universidade Federal de Goias, Goiania, GO (Brazil). Faculdade de Medicina. Dept. de Diagnostico por Imagem]. E-mail: cmontandon@terra.com.br

    2007-01-15

    Sacroiliitis is a non-infectious inflammatory process involving the sacroiliac joint, and is a diagnostic criterion for seronegative spondyloarthropathies. Imaging methods are of great value for confirming the diagnosis of this condition. The present study is a review of cases included in didactic files and in the literature to illustrate the anatomy, techniques, and main imaging findings in x-ray, computed tomography and magnetic resonance imaging for determining the diagnosis of sacroiliitis, also approaching main differential diagnoses. (author)

  10. Neutron Investigation of Magnon Spectrum in Haematite; Etude du Spectre de Magnons dans l'Hematite, au Moyen des Neutrons; Nejtronnoe issledovanie spektra magnona v gematite; Estudio, por Metodos Neutronicos, del Espectro de Magnones en la Hematita

    Energy Technology Data Exchange (ETDEWEB)

    Dimitrijevic, Z.; Rzany, H.; Todorovic, J.; Wanic, A. [Institute for Nuclear Physics Cracow (Poland)

    1965-04-15

    -Sign y 126 Degree-Sign , respectivamente. Un acuerdo satisfactorio entre la teoria y los datos experimentales disponibles se tiene cuando SJ{sub 1} = SJ{sub 2} = 5,1 meV. Ademas de la rama magnonica acustica, los calculos han revelado la existencia de una rama optica, pero el estudio de esta no pudo llevarse a cabo por el metodo de difraccion neutronica. (author) [Russian] byli provedeny v Vincha na reaktore RA s ispol'zovaniem kristallicheskogo nejtronnogo spektrometra. Rassejanie monohromaticheskih nejtronov ({lambda} = 1.314A) proizvodilos' na krupnom monokristalle gematita ({alpha}-Fe{sub 2}O{sub 3}). Issledovalis' uglovye raspredelenija neuprugo rassejannyh nejtronov. Dlja rjada razlichnyh nepravil'nyh uglov kristalla AO byla izmerena shirina G puchka rassejannyh nejtronov (tak nazyvaemogo konusa rassejanija). Jetot konus rassejanija byl pripisan javleniju poverhnostnogo rassejanija magnona vokrug tochki obratnoj reshetki [1,1,1] . Dlja rjada skorostej magnona byla rasschitana i sravnena s jeksperimental'nymi tochkami zavisimost' G ot nepravil'nogo ugla. Ustanovleno, chto velichina skorosti v napravlenii [111] ravna 25,5 11,0 km/sek. Byla obnaruzhena strukturnaja anizotropija dispersionnogo sootnoshenija magnona. Bylo najdeno, chto skorost' javljaetsja bolee vysokoj v napravlenijah rasprostranenija parallel'nyh osi [111] i chto kachestvenno ona horosho soglasuetsja s bolee rannimi izmerenijami (Riste i dr.) dajushhimi v = 38km/sek. Obnaruzhit' v akusticheskoj oblasti jenergii magnona sushhestvovanie razryva jenergeticheskoj krivoj Eg ne udalos'. Bylo rasschitano, chto velichina E dolzhna byt' nizhe 1 Mjev. Pri pomoshhi formalizma Uollase byli rasschitany dispersionnye sootnoshenija magnona v gematite. Pri jetom ishodili ije predpolozhenija, chto sushhestvujut dva ne stremjashhihsja k nulju integrala obmena J{sub 1} i J{sub 2}. J{sub 1} i J{sub 2} oznachajut svjaz' sverhobmennoj jenergii mezhdu spinami sosednih ionov zheleza, svjazannyh ionom kisloroda. Ugly svjazi

  11. Imperfect twinning - evaluation by imaging methods; Gemelidade imperfeita - avaliacao pelos metodos de imagem

    Energy Technology Data Exchange (ETDEWEB)

    Teixeira, Arildo Correa; Julio, Hamilton [Parana Univ., Curitiba, PR (Brazil). Hospital das Clinicas. Disciplina de Ginecologia e Obstetricia; Mazer, Sergio; Urban, Linei Augusta Brolini Delle [Parana Univ., Curitiba, PR (Brazil). Hospital das Clinicas. Servico de Radiologia]. E-mail: lineiurban@hotmail.com

    2003-02-01

    Conjoined twins are rare malformations and a challenge for both radiologists and pediatric surgeons. Antenatal evaluation is essential for the identification of anatomic fusions and other associated abnormalities, which will enable an adequate surgical planning and the assessment of fetal prognosis. The authors present the clinical and imaging findings of thoracopagus twins, joined by the anterior portion of the thorax, sharing the heart and the liver. Diagnosis was made by ultrasonography and confirmed with fetal magnetic resonance imaging. (author)

  12. CUSTOS DE PRODUÇÃO DE GADO BOVINO EM REGIME DE CONFINAMENTO: ANALISE DO METODO DE CUSTEIO POR ABSORÇÃO EM UMA PROPRIEDADE RURAL EM TANGARA DA SERRA-MT

    Directory of Open Access Journals (Sweden)

    Monica Aparecida Burgos Alexandre Pinto

    2014-06-01

    Full Text Available A pecuária de corte é uma importante atividade econômica desenvolvida no Brasil, informações do Ministério da Agricultura dão conta de que a carne bovina, dentre outras carnes produzidas neste país, deverá ter um aumento na produção em 12,6 milhões de toneladas até 2019, isso se deve ao adequado uso das pastagens por meio de técnicas agronômicas modernas e de investimentos em genética, acarretando uma menor utilização de áreas. Este trabalho foi confeccionado com o objetivo de analisar os custos de produção na terminação do gado de corte em regime de confinamento, através do emprego do método de custeio. A metodologia utilizada para a presente pesquisa envolveu estudo de caso de uma propriedade rural, localizada no município de Tangará da Serra-MT. Através de informações coletadas na fazenda, levantou-se o custo do confinamento, bem como a identificação dos elementos que possuem maior influência em relação ao custo de produção na atividade. Foram considerados dois quantitativos de animais confinados, sendo 12.000 animais, durante o ciclo de manejo de 2011 e 11.000 animais, durante o ciclo de manejo de 2012. No resultado da pesquisa verificou-se que os componentes do custo operacional efetivo exerceram maior influência sobre os custos da atividade de confinamento de gado, destacando-se em ordem decrescente: a aquisição de animais, a alimentação. Em relação a essa atividade mostrou-se rentável, tendo como vantagem de destaque o reduzido custo da aquisição boi magro, pois veio de uma filial do grupo, e outro fator foi a alta no preço do período que foi realizado a venda. Conclui-se que a atividade tem condições de se manter em longo prazo se continuar com planejamento adequado.

  13. Electrochemical performance in the hydrogen evolution reaction of Ni-TR (TR= La, Ce) materials synthesized using the solid state reaction method; Desempeno electroquimico en la reaccion de evolucion de hidrogeno de materiales de electrodo Ni-TR (TR = La, Ce) sintetizados por el metodo de reaccion de estado solido

    Energy Technology Data Exchange (ETDEWEB)

    Torres-Huerta, A. M.; Dominguez-Crespo, M. A.; Ramirez-Meneses, E.; Yanez-Zamora, C. [CICATA, IPN, Altamira, Tamaulipas (Mexico); Avila-Garcia, I. [IPN, ESIQIE, UPALM, Mexico, D.F. (Mexico)]. E-mail: mdominguezc@ipn.mx; adcrespo2000@yahoo.com.mx

    2009-09-15

    relacionados con su operacion. El material de electrodo con mayor electroactividad es el Pt, pero debido a su costo elevado se han tenido que buscar electrocatalizadores alternativos con un balance entre costo y actividad. Uno de los materiales que mas se ha utilizado es el Niquel en conjunto con algunas de sus aleaciones. Este material ha demostrado un buen desempeno utilizando bajos sobrepotenciales en reacciones tradicionales como las reacciones de evolucion de hidrogeno (REH) y oxigeno (REO), asi como una alta resistencia a la corrosion y bajo costo. Particularmente, aleaciones binarias y ternarias han demostrado un incremento importante en la actividad de la REH al compararla con los materiales en su estado puro o masivo. Por esta razon, en la busqueda de nuevas alternativas con una aceptable eficiencia al compararla con los materiales a bajo costo, en este trabajo se obtuvieron materiales Ni-TR (TR = La, Ce) por el metodo de reaccion de estado solido, a partir de: a) acetilacetonatos metalicos y b) polvos metalicos. Estos materiales se sinterizaron durante 3 h a diferentes temperaturas (795 o 920 , 1000 y 1200 grados centigrados) a fin de evaluar su efecto en el desempeno electroquimico de los electrocatalizadores. La caracterizacion estructural y morfologica de materiales se realizo por las tecnicas de DRX y MEB, respectivamente. Asimismo, el desempeno electroquimico de los materiales de electrodo se evaluo en la REH utilizando voltametria ciclica (VC) y curvas potenciodinamicas. Los resultados obtenidos muestran que a bajas temperaturas se obtiene una mezcla de oxidos (NiO, CeO{sub 2} y LaNiO{sub 3}); sin embargo a medida que la temperatura de sinterizado se incrementa, se alcanza la formacion de las aleaciones NiO-CeO{sub 2} y NiO-LaNiO{sub 3}, respectivamente. Al mismo tiempo se observo una clara dependencia de la actividad electrocatalitica con la fuente obtencion de estos materiales (Ni-TR).

  14. Ni{sub 0,5}Zn{sub 0,5}Fe{sub 2}O{sub 3} ferrite synthesized by combustion and Pechini method for use in nanomedicine: methods evaluation; Ferrita Ni{sub 0,5}Zn{sub 0,5}Fe{sub 2}O{sub 3} sintetizada por reacao de combustao e metodo Pechini para uso na nanomedicina: avaliacao dos metodos

    Energy Technology Data Exchange (ETDEWEB)

    Albuquerque, I.L.T. de; Nascimento, A.L.C.; Costa, A.C.F.M., E-mail: allana.layla@gmail.com [Universidade Federal de Campina Grande (UFCG), PB (Brazil). Unidade Academica de Engenharia de Materiais

    2016-07-01

    The objective of this work was to synthesize the Ni0.5Zn0.5Fe2O3 ferrite by combustion reaction and Pechini method, and to evaluate structural characteristics and magnetic behavior for its use in nanomedicine. The synthesized ferrite was characterized by DRX, BET, TG and magnetic properties. According to the results of XRD, the Ni{sub 0,5}Zn{sub 0,5}Fe{sub 2}O{sub 3} ferrite synthesized by both methods presented nano crystallite sizes, high crystallinity, surface area, stable at high temperatures and with high saturation magnetization, being higher in the ferrite synthesized by combustion reaction. Both methods produced materials that could be used in nanomedicine.

  15. Diffusion Parameters of BeO by the Pulsed Neutron Method; Calcul des Parametres de Diffusion de BeO par la Methode des Neutrons Pulses; Opredelenie diffuzionnykh parametrov BeO s pomoshch'yu metoda impul'snykh nejtronov; Determinacion de los Parametros de Difusion en el BeO por el Metodo de los Neutrones Pulsados

    Energy Technology Data Exchange (ETDEWEB)

    Joshi, B. V.; Nargundkar, V. R.; Subbarao, K. [Atomic Energy Establishment Trombay, Bombay (India)

    1965-08-15

    la position et la longueur du compteur d'une part, la position de la source d'autre part, il est possible d'eliminer la plupart des harmoniques spatiaux. Il est egalement possible de tenir compte de n'importe quel bruit de fond constant pour le calcul de la constante de decroissance. Il faut eviter les laplaciens tres eleves afin de ne pas avoir d {sup h}armoniques du temps. Tous les harmoniques qui restent sont rendus inoperants par un retard en temps adequat. Les auteurs ont determine la constante de decroissance du mode fondamental de la population de neutrons thermiques pour plusieurs laplaciens. Ils discutent les conditions a remplir pour une determination exacte de la constante du refroidissement par diffusion C. Pour la glucine, ils ont obtenu les constantes suivantes: {lambda}{sub 0} (constante d'absorption) = 156, 02 {+-} 4, 37 s{sup -1}. D (coefficient dediffusion) = (1,3334 {+-} 0,0128) * 10{sup 5} cm{sup 2}/s, C (constante du refroidissement de diffusion) = (-4,8758 {+-} 0,5846) * 10{sup 5} cm{sup 4}/s. Les auteurs ont etudie le role que peut jouer, dans la determination des parametres de diffusion, le fait que la contribution du terme en B{sup 6} est neglige; ils montrent qu'il est considerable. Ce serait la probablement la cause des ecarts entre les valeurs de C obtenues pour un meme ralentisseur par differents chercheurs. (author) [Spanish] Los autores describen el empleo del metodo de los neutrones pulsados para determinar con precision los parametros de difusion en moderadores. Con ayuda de este metodo, han obtenido los parametros de difusion en el BeO. Las rafagas de neutrones se generaron mediante un acelerador en cascada pulsando la fuente ionica y empleando la reaccion Be (d, n). Como detector se utilizo un contador proporcional de BF{sub 3} enriquecido. Los autores demuestran que por seleccion adecuada de la posicion y longitud del contador y de la ubicacion de la fuente, pueden eliminarse la mayoria de los armonicos espaciales. En el calculo de

  16. The use of stochastic method for the calculation of liquid-vapor multicomponent equilibrium and the contribution of groups theory for the evaluation of fugacity coefficient; Uso de um metodo estocastico para calculo do equilibrio liquido-vapor de sistemas multicomponentes e avaliacao de uma abordagem por contribuicao de grupos para o calculo do coeficiente de fugacidade

    Energy Technology Data Exchange (ETDEWEB)

    Cavalcanti, Rafaelly L.; Oliveira, Jackson A. [Universidade Federal do Rio Grande do Norte (UFRN), Natal, RN (Brazil). Dept. de Engenharia Quimica; Rojas, Leopoldo O.A. [Centro de Tecnologias do Gas (CTGAS), Natal, RN (Brazil)

    2008-07-01

    This work has the main objective of evaluating the mathematical model developed by Jaubert e Mutelet (2004) in terms of the prediction capacity for the calculation of the vapor-liquid equilibrium (VLE). This model is based on Peng-Robinson equation of state (EOS) and it considers the binary interaction parameters (Kij(T)) estimated by a contribution group method and dependent of the temperature. The model proposed by Jaubert e Mutelet (2004), named PPR78 (Predictive Peng-Robinson), was implemented in this work by using the Fortran language. An optimization approach based on the stochastic algorithm of Particle Swarm Optimization (PSO) was used in order to calculate the vapor-liquid equilibrium. Simulations were accomplished for several binary systems and the results were concordant with some experimental data of the investigated systems. However, for some systems different from those presented by Jaubert and Mutelet (2004), the model presented low prediction capacity. In spite of the great demand of computational performance, the algorithm PSO demonstrated robustness during the calculation of VLE and it assured convergence in most of the cases. (author)

  17. Utilization of radiometric method in evaluation of wear on human dental enamel in vitro by dental porcelain glazed and polished; Utilizacao do metodo radiometrico na avaliacao in vitro do desgaste provocado ao esmalte dental humano por porcelanas dentais glazeadas e polidas

    Energy Technology Data Exchange (ETDEWEB)

    Adachi, Lena Katekawa; Campos, Tomie Nakakuki de; Adachi, Eduardo Makoto [Sao Paulo Univ., SP (Brazil). Faculdade de Odontologia. Dept. de Protese]. E-mail: katekawa@usp.br; Saiki, Mitiko [Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil)]. E-mail: mitiko@curiango.ipen.br

    2005-07-01

    The dental porcelain is a material commonly used in prosthesis. Disadvantages of dental porcelain use include possibility to cause tooth or dental materials wear. Before its use in the mouth, surfaces are treated with polishing and/or glazing. This research used the radiometric method to verify the influence of these surface treatments on the porcelains of commercial brands: Ceramco II, Noritake and Finesse. This method was originally developed for dentifrice abrasiveness evaluation. Five specimens of dental enamel and 10 specimens of each porcelain (5 glazed, 5 polished) were used. The dental enamel was flattened and irradiated with neutrons from the IEA-R1 (IPEN/CNEN) nuclear reactor. Then it was weared by each porcelain in sliding motion, with water. After 2,500 cycles for each porcelain specimen, the released enamel residue was measured. The enamel wear was evaluated by measuring beta activity of {sup 32}P transferred to water from the irradiated tooth. Results varied from 2.57 to 5.81 {mu}g of enamel /mm{sup 2} weared surface. There was no statistical difference ({alpha}=0.05) between dental enamel wear caused by the same porcelains glazed or polished. The results suggest that adequate surface finishing depend on the type of dental porcelain. (author)

  18. Calcaneal tendon: imaging findings; Tendao calcaneo: avaliacao por imagem

    Energy Technology Data Exchange (ETDEWEB)

    Montandon, Cristiano; Fonseca, Cristiano Rezio; Montandon Junior, Marcelo Eustaquio [Colegio Brasileiro de Radiologia e Diagnostico por Imagem, Sao Paulo, SP (Brazil)]. E-mail: crismontandon@hotmail.com; Lobo, Leonardo Valadares; Ribeiro, Flavia Aparecida de Souza; Teixeira, Kim-Ir-Sen Santos [Goias Univ., Goiania, GO (Brazil). Hospital de Clinicas. Dept. de Diagnostico por Imagem e Anatomia Patologica

    2003-12-01

    We reviewed the radiological and clinical features of 23 patients with calcaneal tendon diseases, who were submitted to ultrasound or magnetic resonance imaging. The objective of this study was to characterize the lesions for a precise diagnosis of calcaneal tendon injuries. A wide range of calcaneal tendon diseases include degenerative lesions, inflammation of the peritendinous tissue such as peritendinitis and bursitis, and rupture. Imaging methods are essential in the diagnosis, treatment and follow-up of calcaneal tendon diseases. (author)

  19. Microscale adaptation of the potentiometric method with ion-selective electrode for the quantification of fluoride; Adaptacion a microescala del metodo potenciometrico con electrodo ion selectivo para la cuantificacion de fluoruro

    Energy Technology Data Exchange (ETDEWEB)

    Guevara Ruiz, Paulina; Ortiz Perez, Maria Deogracias [Laboratorio de Bioquimica, Facultad de de Medicina, Universidad Autonoma de San Luis Potosi, San Luis Potosi, San Luis Potosi, (Mexico)]. E-mail: mdortiz@uaslp.mx

    2009-05-15

    muestra necesarios, disminuya costo y substancias de desecho. Se valido el metodo potenciometrico establecido en la NMX-AA-077-SCFI-2001, asi como el metodo a microescala propuesto en este trabajo; posteriormente, se compararon ambos metodos mediante graficos y calculos estadisticos. Ademas se analizaron por ambos metodos 125 muestras de agua embotellada de venta en la ciudad de San Luis Potosi. Los datos de la validacion del metodo fueron optimos para su desempeno. Los resultados de la determinacion en las muestras de agua embotellada por ambos metodos, indican que la modificacion a microescala es estadisticamente comparable al metodo potenciometrico con electrodo ion selectivo. El metodo propuesto a microescala es apropiado para su utilizacion, con una reduccion de 95 % en costo y desechos generados.

  20. Pulsed and Static Neutron Measurements in Light-Water and Heavy-Water Exponentials; Mesures par les Methodes Pulsee et Statique dans les Ensembles Exponentiels a Eau Legere et a Eau Lourde; Izmerenie impul'snykh i staticheskikh nejtronov v ehksponentsial'nykh ustanovkakh s obychnoj i tyazheloj vodoj; Mediciones por los Metodos Pulsados y Estaticos en Conjuntos Exponenciales de Agua Ligera y Agua Pesada

    Energy Technology Data Exchange (ETDEWEB)

    Parkinson, T. F.; Perez, R. B.; Fry, D. N.; Hartley, R. H.; Smith, S. P.D.; Diaz, N. J. [University of Florida, Gainesville, FL (United States)

    1964-04-15

    deduce mediante una formula sencilla en la que intervienen {lambda}{sub 0}, k{sub {infinity}} {tau}, L{sup 2} y B{sup 2} en la cual B{sup 2} satisface la ecuacion critica de dos zonas. La probabilidad de ausencia de escape de los neutrones rapidos se expreso por la teoria de la edad de Fermi. El metodo de calculo consistio en asignar un valor aproximado a la constante de desintegracion {lambda}, y en operar luego por iteracion hasta encontrar un valor de B{sup 2} compatible con la ecuacion critica y las condiciones limite. Tambien se ensayaron dos otroe modelos, a saber: Modelo B: Se imagina un sistema de dos zonas y un solo grupo en el que el factor B{sup 2}{sub g} del nucleo de Fermi se toma como laplaciano geometrico del sistema desnudo equivalente, teniendo en cuenta la economia del reflector. Modelo C: Se imagina un sistema desnudo de dos grupos en el que se tiene en cuenta la economia del reflector. Al comparar las constantes de desintegracion calculadas y obtenidas experimentalmente, se comprueba que solo asegura una concordancia satisfactoria el modelo A. Esto permite llegar a las siguientes conclusiones: 1. La presencia del reflector ejerce una influencia considerable sobre la fisica del sistema pulsado. La hipotesis segun la cual se admite una economia debida al reflector no es valida en todos los casos. 2. El valor de la constante de decrecimiento {lambda} depende en gran medida del valor atribuido a la probabilidad de ausencia de escape de los neutrones rapidos. Los experimentos indican que la tecnica de los neutrones pulsados permite determinar k{sub {infinity}} en conjuntos heterogeneos de pequeflas dimensiones. Los autores estan llevando a cabo trabajos con barras huecas de uranio que permiten simular el empleo de refrigerantes organicos. (author) [Russian] Dolgoe vremja dlja opredelenija material'nogo laplasiana razmnozhajushhej sredy ispol'zovalsja jeksponencial'nyj jeksperiment. Sovsem nedavno dlja izmerenija sobstvennogo znachenija vremeni {lambda}, iz

  1. Estudio numerico y experimental del proceso de soldeo MIG sobre la aleacion 6063--T5 utilizando el metodo de Taguchi

    Science.gov (United States)

    Meseguer Valdenebro, Jose Luis

    improvement on mechanical properties in aluminum metal joint. Los procesos de soldadura por arco electrico representan unas de las tecnicas mas utilizadas en los procesos de fabricacion de componentes mecanicos en la industria moderna. Los procesos de soldeo por arco se han adaptado a las necesidades actuales, haciendose un modo de fabricacion flexible y versatil. Los resultados obtenidos numericamente en el proceso de soldadura son validados experimentalmente. Los principales metodos numericos mas empleados en la actualidad son tres, metodo por diferencias finitas, metodos por elementos finitos y metodo por volumenes finitos. El metodo numerico mas empleado para el modelado de uniones soldadas, es el metodo por elementos finitos, debido a que presenta una buena adaptacion a las condiciones geometricas y de contorno ademas de que existe una diversidad de programas comerciales que utilizan el metodo por elementos finitos como base de calculo. Este trabajo de investigacion presenta un estudio experimental de una union soldada mediante el proceso MIG de la aleacion de aluminio 6063-T5. El metodo numerico se valida experimentalmente aplicando el metodo de los elementos finitos con el programa de calculo ANSYS. Los resultados experimentales obtenidos son: las curvas de enfriamiento, el tiempo critico de enfriamiento t4/3, geometria del cordon, microdurezas obtenidas en la union soldada, zona afectada termicamente y metal base, dilucion del proceso, areas criticas intersecadas entre las curvas de enfriamiento y la curva TTP. Los resultados numericos son: las curvas del ciclo termico, que representan tanto el calentamiento hasta alcanzar la temperatura maxima y un posterior enfriamiento. Se calculan el tiempo critico de enfriamiento t4/3, el rendimiento termico y se representa la geometria del cordon obtenida experimentalmente. La zona afectada termicamente se obtiene diferenciando las zonas que se encuentran a diferentes temperaturas, las areas criticas intersecadas entre las

  2. Evaluation of methods for wax determination in crude oil; Avaliacao de metodos de determinacao de parafinas em petroleo

    Energy Technology Data Exchange (ETDEWEB)

    Dias, Julio Cesar M.; Silva, Maria do Socorro A.J. da; Vasconcellos, Rosa C.U. [PETROBRAS S.A., Rio de Janeiro, RJ (Brazil). Centro de Pesquisas; Tamanqueira, Juliana B. [Fundacao Gorceix, Ouro Preto, MG (Brazil)

    2008-07-01

    Determining the wax content of crude oil is of great importance for petroleum industry, especially for production, storage and transportation of crude oils. Many different methodologies of wax determining are available in the technical literature. However, the selection of the most suitable method must be in accordance with the aim of the analysis and observing the specificities of each technique. The purpose of this work was to determine the performance of different techniques of wax determining applied to characterization of precipitation properties of waxy compounds in crude oils. Twelve samples of crude oils proceeding from the main Brazilian oil producing sedimentary basins were selected for this study. These samples were analyzed by three important analytical techniques of wax determining: precipitation by cooled solvent; liquid chromatography with precipitation by cooled solvent; and liquid chromatography followed by gas chromatography. Differential scanning calorimetry data related to the wax crystallization in these oils were used as parameters of validation. The results obtained in this study indicate that the liquid chromatography followed by gas chromatography method has the best performance for wax determining in crude oils. (author)

  3. Method to allow the estimation of heat transfer coefficients in solar stills; Metodo para determinar coeficientes locales de transferencia de calor en destiladores solares

    Energy Technology Data Exchange (ETDEWEB)

    Rubio Cerda, Eduardo; Porta Gandara, Miguel A [CIBNOR, Mexico D.F (Mexico); Fernandez Zayas, Jose Luis [UNAM Mexico, D.F. (Mexico)

    2000-07-01

    This work reports an experimental method that allows to estimate the heat transfer coefficients in the neighborhood of walls or flat plates subject to convective transport phenomena. This method can be applied to a great variety of thermal systems since it is based on the knowledge of the border condition for the temperature at the surface of the plate, and the temperature profile that characterize the dimensionless coefficient of heat transfer in the fluid, according to its definition given by the Nusselt number. The approach of this work are the foundations of the method and the system that has been developed to apply it, that incorporates automatic acquisition equipment for continuos monitoring of the information and elements to control the parameters of interest. In addition, the experimental cavities on which the method will be evaluated are discussed, considering two different scales, as well as experiments in cavities filled with air, and with a mixture of air and steam water, as is the case for solar distillation. [Spanish] En este trabajo se presenta un metodo que permite determinar de manera experimental coeficientes de transferencia de calor por conveccion. Este metodo puede ser aplicado a una gran variedad de sistemas termicos ya que se fundamenta en el conocimiento de la condicion de frontera para la temperatura en la superficie de la placa, y del perfil de temperaturas que caracteriza el coeficiente adimensional de transferencia de calor en el fluido, de acuerdo a la definicion de este, dada por el numero de Nusselt. El trabajo que aqui se reporta esta enfocado a la fundamentacion del metodo y al equipamiento que se ha desarrollado para instrumentarlo, que incorpora equipos automaticos de adquisicion continua de informacion y elementos de control para los parametros de interes. Se presentan ademas, las cavidades experimentales sobre las que sera evaluado el metodo, que considera dos escalas diferentes, asi como experimentos en cavidades llenas de aire

  4. Scienza e conoscenza: sul valore del metodo scientifico

    Directory of Open Access Journals (Sweden)

    Riccardo Luciano Appolloni

    2014-05-01

    Full Text Available L’antico problema di riconoscere una forma di conoscenza oggettivae fondata è ancora vivo; in questo scritto cercheremo di capire se la scienza moderna possa essere una forma di conoscenza tale e, quindi, privilegiata. A tal fine ci serviremo del pensiero di alcuni epistemologi e scienziati. In particolare, nel trattare il problema del valore epistemologico del metodo scientifico, non potremo esimerci dal fare i conti con l’anarchismo metodologico di Paul K. Feyerabend, verso il quale l’esito del presente articolo sarà fondamentalmente critico. A partire dai fecondi spunti di questo filosofo, tenteremo dapprima di analizzare i caratteri distintivi della scienza e del suo metodo rispetto ad altre forme di sapere; quindi, cercheremo di individuare alcuni limiti della conoscenza razionale.

  5. Il metodo storico nella critica testuale

    OpenAIRE

    Giangrande, Giusseppe

    2008-01-01

    Se ofrecen ejemplos de cómo es posible explicar por medio de un enfoque histórico pasajes controvertidos de autores griegos y latinos. Passages of Greek and Latin authors which many a critic cannot understand can often be explained by placing them in the proper historical perspective.

  6. Torque calculation in the induction motor with the finite element method; Calculo del par en el motor de induccion con el metodo del elemento finito

    Energy Technology Data Exchange (ETDEWEB)

    Castillo Diaz, Ramon

    2002-06-15

    In this work the method of the finite element is applied to the bi-dimensional analysis of the induction motor in operation in steady state, excited by sine sources of laminar currents and sine sources of voltage. The analysis is focused mainly in the calculation of the electromagnetic torque. The topics of electromagnetic theory are covered and in an idealized model of the induction motor, analytically and numerically with the method of the finite element, in the variant method of Galerkin, the vectorial potential and the torque are calculated. The results obtained with the analytical and numerical methods are compared. Three formulations are developed to calculate the torque with the method of the finite element, using triangular elements of first order, based in the equation of force of Lorentz, the Maxwell tensor and the principle of the virtual work. Finally, a motor of induction of real characteristics is simulated, assuming it is connected to a three-phase voltage source. In this motor it is analyzed the convergence and the evolution in the results obtained of the torque with different discretions, and the torque-velocity performance curve is calculated. [Spanish] En este trabajo se aplica el metodo del elemento finito al analisis bidimensional del motor de induccion en operacion en estado estable, excitado por fuentes de corriente laminar senoidales y fuentes de voltaje senoidales. El analisis se enfoca principalmente en el calculo del par electromagnetico. Se tratan los topicos de teoria electromagnetica involucrados y en un modelo idealizado del motor de induccion, se calculan analitica y numericamente con el metodo del elemento finito, en la variante metodo de Galerkin, el potencial vectorial y el par. Se comparan resultados obtenidos con los metodos analiticos y numericos. Se desarrollan tres formulaciones para calcular el par con el metodo del elemento finito, utilizando elementos triangulares de primer orden, basadas en la ecuacion de fuerza de

  7. Valoracion economica ambiental de la calidad del aire por emisiones industriales en la ciudad de quevedo,ecuador

    OpenAIRE

    Espol; Cabrera Casillas, Elvis Antonio; Lozano Mendoza, Pedro Harrys

    2017-01-01

    El objetivo principal del estudio es realizar una valoracion economico ambiental por la mejora de la calidad del aire en quevedo, para esto se elaboro un escenario hipotètico utilizando el metodo de valoracion contingente en su formato dicotomico doble. Guayaquil CAMBIO CLIMATICO

  8. A modification of the method for determining current efficiency of aluminium electrolytic cells; Modification de la methode permettant de determiner le rendement des cuves dans la production d'aluminium par electrolyse; Izmenenie metoda opredeleniya ehffektivnosti toka v alyuminievykh ehlektroliticheskikh bakakh; Modificacion del metodo para determinar el rendimiento de las celdas utilizadas en la produccion de aluminio por electrolisis

    Energy Technology Data Exchange (ETDEWEB)

    Pradzynski, A [Institute of Basic Technical Problems, Polish Academy of Sciences. Warsaw (Poland); Orman, Z [Institute of Nonferrous Metals, Gliwice (Poland)

    1962-01-15

    de faciliter l'application de cette methode dans les usines d'aluminium et d'eviter toutes les restrictions et tous les dangers qu'entraine la manipulation, en dehors des laboratoires speciaux pour l'etude des radioisotopes, de sources radioactives non scellees. De l'or inactif a ete introduit dans' l'alliage type et dans le bain de la cuve electrolytique. La concentration d'or dans les echantillons d'alliage type et dans les echantillons preleves dans la cuve a ete mesuree apres irradiation de ces echantillons dans un reacteur nucleaire. (author) [Spanish] El procedimiento para determinar el rendimiento de las celdas para la produccion de aluminio por electrolisis fue descrito inicialmente por Rempel y col. y fue perfeccionado por Bozoky y col. que emplearon el radioisotopo {sup 198}Au. Este procedimiento consiste en preparar aleaciones tipo de aluminio con {sup 198}Au y medir la elevada actividad especifica de muestras de la aleacion con un tubo Geiger-Mueller, introduciendo plomo como absorbente entre el tubo y la muestra. Los autores midieron la actividad especifica de la aleacion tipo despues de diluirla con una cantidad conocida de aluminio puro. De esta manera, las muestras de aleacion tipo diluida y las muestras tomadas en la celda electrolitica tienen una actividad especifica del mismo orden de magnitud, que puede ser medida sin necesidad de absorbente. Los autores han recurrido al analisis por radiactivacion con objeto de facilitar la aplicacion de este procedimiento en las fabricas de aluminio y evitar las restricciones y los peligros que supone la utilizacion de fuentes de radiacion no encerradas fuera .de los laboratorios de radioisotopos. El procedimiento consiste en introducir oro inactivo en la aleacion tipo y en la masa fundida de la celda electrolitica. Se extraen muestras de la aleacion y del electrolito y, despues de irradiarlas en un reactor nuclear, se determina la concentracion de oro. (author) [Russian] Metod opredeleniya ehffektivnosti toka v

  9. Method by chromatography of gases for the determination of made up of alcoholic fermentation in pineapple fruits (Ananas comosus [L.] Merr); Metodo por cromatografia de gases para la determinacion de compuestos de fermentacion alcoholica en frutos de pina (Ananas comosus [L.] Merr)

    Energy Technology Data Exchange (ETDEWEB)

    Murillo Williams, A

    2001-07-01

    The pineapple (Ananas comosus) it is used in the entire world for the fresh consumption or for processed products (canned, frozen, dehydrated). it is cultivated in a wide range of countries and in extreme latitudes.The factors of quality include: maturity, stability, size uniformity, absence of microbial deterioration, absence of burns for the sun, absence of blows, damage for insects and breaking, crowns, color, longitude and integrity. The factors that determine the longevity of a product can be physiologic or pathological. The physiologic conditions refer to the processes of degradation of the fabrics after the crop, while the pathological ones involve the attack of mushrooms and bacteria. In the case of the pineapple, a physiologic problem exists, called black heart, internal brewing (IB), brown endogenic stain ({sup m}ancha cafe endogena{sup ,} MCE) or chilling injury (CI) that can happen in any part of the world where it is cultivated. This problem has associated to the exhibition from the pineapple to low temperatures, so it is a challenge to manage a fruit like the pineapple that it cannot tolerate low temperatures without problems. In studies made about the physiologic changes that happen during the storage in controlled atmospheres in fruits, it has been observed that the ethanol and the acetaldehyde are volatile compounds associated with metabolic post-crop changes and that they have implication in the quality of the product. (author) [Spanish] La pina (Ananas comosus) se utiliza en todo el mundo para el consumo fresco o para productos procesados (enlatados, congelados, deshidratados). Se cultiva en un amplio rango de paises y en latitudes extremas. Los factores de calidad incluyen: madurez, firmeza, uniformidad de tamano, ausencia de deterioro microbiano, ausencia de quemaduras por el sol, ausencia de golpes, dano por insectos y quebraduras, corona, color, longitud e integridad. Los factores que determinan la longevidad de un producto pueden ser

  10. Method of identifying the friction of rotors using the wavelet transform; Metodo para identificar el rozamiento de rotores utilizado la transformada wavelet

    Energy Technology Data Exchange (ETDEWEB)

    Jauregui Correa, Juan Carlos; Rubio Cerda, Eduardo; Gonzalez Brambila, Oscar [CIATEQ, A.C., Queretaro (Mexico)

    2007-11-15

    The modern processes of signal analysis that measure mechanical vibrations are based on the fast transform of Fourier (FFT), nevertheless, this method is not able to identify transient phenomena nor of nonlinear nature. Although many efforts have been made to try to identify these phenomena in the frequency spectra, it is not possible to correlate the spectra with the physical characteristics of this type of phenomena. Within these phenomena on the rubbing of a rotor against the housing or trunnion of a bearing, this phenomenon has a nonlinear behavior, as it is demonstrated in this paper. In the first part a method based on the of signal analysis type wavelets is presented and how this technique can be used to predict transient and nonlinear phenomena. Once defined the method, its application in the identification of the friction of rotors is demonstrated. With this, one demonstrates that the method presented in this paper allows to also identifying in real time the rubbing phenomenon and also that it can be used as an of analysis technique in the preventive maintenance systems. [Spanish] Los procesos modernos de analisis de senales que miden vibraciones mecanicas se basan en la transformada rapida de Fourier (FFT por sus siglas en ingles), sin embargo, este metodo no es capaz de identificar fenomenos transitorios ni de naturaleza no lineal. A pesar de que se han hecho muchos esfuerzos para tratar de identificar estos fenomenos en los espectros de frecuencia, no es posible correlacionar el espectro con las caracteristicas fisicas de este tipo de fenomenos. Dentro de estos fenomenos sobre el rozamiento de un rotor contra la carcasa o munon de una chumacera, este fenomeno tiene un comportamiento no lineal, como se demuestra en este trabajo. En la primera parte se presenta un metodo basado en el analisis de senales tipo wavelets y como esta tecnica puede utilizarse para predecir fenomenos transitorios y no lineales. Una vez definido el metodo, se demuestra su

  11. Dose estimation by biological methods; Estimacion de dosis por metodos biologicos

    Energy Technology Data Exchange (ETDEWEB)

    Guerrero C, C; David C, L; Serment G, J; Brena V, M [Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    1997-07-01

    The human being is exposed to strong artificial radiation sources, mainly of two forms: the first is referred to the occupationally exposed personnel (POE) and the second, to the persons that require radiological treatment. A third form less common is by accidents. In all these conditions it is very important to estimate the absorbed dose. The classical biological dosimetry is based in the dicentric analysis. The present work is part of researches to the process to validate the In situ Fluorescent hybridation (FISH) technique which allows to analyse the aberrations on the chromosomes. (Author)

  12. Synovial chondromatosis of the shoulder: imaging findings; Osteocondromatose sinovial no ombro: achados por metodos de imagem

    Energy Technology Data Exchange (ETDEWEB)

    Terazaki, Carlos Renato Ticianelli; Trippia, Carlos Henrique; Caboclo, Maria Fernanda Sales Ferreira; Medaglia, Carla Regina Miranda, E-mail: reticianelli@hotmail.com [Hospital Sao Vicente (FUNEF), Curitiba, PR (Brazil). Servico de Radiologia e Diagnostico por Imagem; Trippia, Cesar Rodrigo [Hospital Sao Vicente (FUNEF), Curitiba, PR (Brazil)

    2014-01-15

    Synovial chondromatosis is a benign condition characterized by synovial proliferation and metaplasia, with development of cartilaginous or osteocartilaginous nodules within a joint, bursa or tendon sheath. In the shoulder, synovial osteochondromatosis may occur within the glenohumeral joint and its recesses (including the tendon sheath of the biceps long head), and in the subacromial-deltoid bursa. Such condition can be identified either by radiography, ultrasonography or magnetic resonance imaging, showing typical features according to each method. Radiography commonly shows ring-shaped calcified cartilages and periarticular soft tissues swelling with erosion of joint margins. Ultrasonography demonstrates hypoechogenic cartilaginous nodules with progressive increase in echogenicity as they become calcified, with development of posterior acoustic shadow in case of ossification. Besides identifying cartilaginous nodules, magnetic resonance imaging can also demonstrate the degree of synovial proliferation. The present study is aimed at describing the imaging findings of this entity in the shoulder. (author)

  13. Microbicidas Metodo de Prevencion en VIH/SIDA Controlado por Mujeres.

    Science.gov (United States)

    Ruiz, Cindy; Torres, Viviana; Cianelli, Rosina; Ferrer, Lilian

    2009-03-01

    HIV/AIDS continues to expand throughout the world, and in recent times has had a severe impact on the number of women living with HIV. Access to methods of prevention for HIV/AIDS around the world is limited and for many women may not be feasible. Examples of such methods are sexual abstinence, which though recognized as an effective method of prevention is difficult for many women to achieve. Mutual fidelity is another option, but many women cannot control the sexual behavior of their partners. Finally, the male condom continues to be an available method of HIV prevention for sexually active people. However, in many places, gender inequality, social norms, and economic disparities severely limit women's capacity to negotiate the use of a condom with their partner. For this reason, an urgent need exists to develop a product for the prevention of HIV/AIDS that can be handled by women. Microbicides, products that can reduce HIV risk when applied intravaginally, hold promise for stopping the advance of HIV/AIDS, especially when considering that women can make their own decisions about whether to use them when other methods of prevention are not available. The objective of the current literature review was to understand the scientific advances related to microbicides in the prevention of HIV/AIDS in women through the analysis of available literature in this area. Interest in this topic emerged from the need to contribute to women's health and HIV/AIDS prevention. To achieve this review's objective, a search was carried out in multiple databases, including OVID, PUBMED, PROQUEST, and CINAHL, as well as published materials from organizations related to this area such as UNAIDS and CONASIDA, and literature available from the Internet. Upon completion of the literature review, it was concluded that microbicides are an effective method for preventing HIV/AIDS for women as well as their partners. Although they have a high level of acceptance among the female population, the majority of microbicides are still in clinical studies, requiring further evaluation for their safe use in humans. There are 3 microbicides in the final phases of clinical studies that will soon be available on the market. One of these was found to be 60% effective in protecting against the transmission of HIV and was used by women in 50% of their sexual activity, which resulted in avoiding approximately 2.5 million new HIV infections in men, women, and children over a 3-year period.

  14. Conocimiento y uso de metodos anticonceptivos por la poblacion femenina de una zona de salud

    Directory of Open Access Journals (Sweden)

    Maroto de Agustín Alicia

    1998-01-01

    Full Text Available FUNDAMENTO: El uso de métodos anticonceptivos está en relación, entre otros, con factores demográficos, sociales, económicos, educativos e ideológicos. El objetivo de este trabajo es conocer qué métodos anticonceptivos conocen las mujeres en edad fértil, así como la prevalencia de su uso. MÉTODOS: A partir del listado de tarjeta sanitaria se seleccionaron mediante muestreo sistemático 389 de las 5800 mujeres en edad fértil (15-45 años asignadas a un centro de salud. Previo envío de una carta, comunicando el motivo del estudio, se contactó telefónicamente con ellas para la realización de una encuesta, la cual incluía preguntas acerca del conocimiento y uso de métodos anticonceptivos, características socioculturales y actividad sexual. Las mujeres que no tenían teléfono fueron citadas en el centro de salud. RESULTADOS: Se contactó con 178 mujeres, de las que participaron 166 (tasa de respuesta de 42,7%. De ellas utilizaban algún método anticonceptivo 86 (51,8%; IC:44,2-59,4%. Sin embargo, entre mujeres con riesgo de embarazo no deseado, la prevalencia de uso era del 70,5% (IC: 62,4-78,6%, destacando el hecho de que en el grupo de mujeres de 40 a 45 años sólo utilizaran anticonceptivos el 45,4%, con una frecuencia significativamente inferior a los otros grupos de edad. Los métodos más conocidos eran el preservativo (90,4%, los contraceptivos orales (89,2% y el dispositivo intrauterino (78,3%, siendo escaso el conocimiento de otros métodos. CONCLUSIONES: La tasa de utilización de métodos anticonceptivos en mujeres con riesgo de embarazo no deseado es aceptable, si bien entre 40 y 45 años es llamativamente baja. Los métodos más conocidos son el preservativo, los contraceptivos orales y el dispositivo intrauterino.

  15. Porous oxides synthesized by the combustion method; Oxidos porosos sintetizados por el metodo de combustion

    Energy Technology Data Exchange (ETDEWEB)

    Lugo L, V

    2005-07-01

    The result of this work, seeks to be a contribution for the treatment of radioactive wastes, with base to the sorption properties that present those porous oxides, synthesized by a method that allows to increase the sorption capacity. The main objective of the present investigation has been the modification of the structural characteristics of the oxides of Fe, Mg and Zn to increase its capacity of sorption of {sup 60} Co in particular. It was studied the effect of the synthesis method by combustion in the inorganic oxides; the obtained solids were characterized using the following techniques: X-ray diffraction (XRD), scanning electron microscopy (SEM), semiquantitative elementary analysis by Dispersive energy spectroscopy (EDS) and determination of surface area by the Brunauner-Emmett-Teller method (BET). Also was carried out batch type experiments for the sorption of Co{sup 2+}, with the purpose of studying the sorption capacity of each one of the prepared oxides. In accordance with that previously exposed, the working plan that was carried out in this investigation is summarized in the following stages: 1. Preparation of inorganic oxides by two different methods, studying the effect of the temperature in the synthesis process. 2. Characterization of the inorganic oxides by XRD, by means of which those were chosen the solids with better properties. 3. Characterization of the inorganic oxides by SEM and EDS where it was studied the morphology of the synthesized materials and the semiquantitative elemental composition. 4. Realization of a sorption experiment type Batch with non radioactive Co{sup 2+} to simulate the sorption of {sup 60} Co and determination of the sorption capacity by means of neutron activation of the non radioactive cobalt. 5. Determination of the surface area by the (BET) technique of the inorganic oxides with better sorption properties. (Author)

  16. LE «SOTTIGLIEZZE DI CERTA DIDATTICA SUPERLATIVA» DELLA GRAMMATICA ELEMENTARE: STORIA (ATTESTATA DEL METODO RAFFORZISTA (1814-1914

    Directory of Open Access Journals (Sweden)

    Michela Dota

    2018-03-01

    Full Text Available Il contributo ripercorre la storia e le peculiarità del metodo rafforzista, metodo glottodidattico per l’insegnamento della lettura e della scrittura. Il metodo, nato in Italia nel primo Ottocento, nell’epoca postunitaria era praticato nelle scuole elementari soprattutto dell’Italia meridionale, nonché nelle scuole reggimentali e in alcuni istituti per sordomuti. Le sue fondamenta, aberranti rispetto alla norma ortografica e ortoepica tradizionale, lo resero obiettivo di un tenace ostracismo da parte del Ministero dell’Istruzione pubblica, sostenuto per questa occasione da due tra i più eminenti glottologi dell’epoca: Graziadio Isaia Ascoli e Francesco Lorenzo Pullè. Il metodo finì per estinguersi nel secondo decennio del Novecento.   The history of the “metodo rafforzista” for teaching Italian (1814-1914 This article retraces the history and peculiarities of the “metodo rafforzista”, a language teaching method developed in Italy during the first part of 1800s. In the post-Unitarian period, it was used in elementary schools, especially in Southern Italy, and also in military schools and in some institutes for the Deaf and Dumb. Orthographic and orthoepic models proposed by the “metodo rafforzista” diverged from rules of traditional Italian grammar. The method, supported by Graziadio Isaia Ascoli and Francesco Lorenzo Pullè, two of the most distinguished Italian linguists at that time, was subsequently rejected by the Ministry of Public Education, and it vanished during the second half of 1900s.

  17. Density evaluation by computerized tomography in plain soils over different manipulation systems; Avaliacao da densidade pelo metodo da tomografia computadorizada de um planossolo sob diferentes sistemas de manejo

    Energy Technology Data Exchange (ETDEWEB)

    Pedrotti, Alceu [Lavras Univ., MG (Brazil). Dept. de Ciencia do Solo; Pauletto, Eloy Antonio [Pelotas Univ., RS (Brazil). Dept. de Solos; Crestana, Silvio [Empresa Brasileira de Pesquisa Agropecuaria (EMBRAPA), Sao Carlos, SP (Brazil). Centro Nacional de Pesquisa e Desenvolvimento de Instrumentacao Agropecuaria (CNPDIA)

    1996-08-01

    The objective of this paper is the evaluation of a plain soil density in different culture systems determined by X ray computerized tomography.It was observed a larger variation in densities in soils profiles analysed. The identification of layers is better utilising computerized tomography than others technic 1 fig.

  18. Photoluminescence evaluation of TiO{sub 2} synthesized by Pechini method; Avaliacao da fotoluminescencia do TiO{sub 2} sintetizado pelo metodo Pechini

    Energy Technology Data Exchange (ETDEWEB)

    Araujo, D.S.; Diniz, V.C.S.; Dantas, J.; Araujo, P.M.A.G.; Costa, A.C.F.M., E-mail: dagobertoufcg@gmail.com [Universidade Federal de Campina Grande (UFCG), PB (Brazil). Programa de Pos-Graduacao em Ciencia e Engenharia de Materiais; Viana, R.S.; Junior, S.A. [Universidade Federal de Pernambuco (UFPE), Recife, PE (Brazil). Dept. Quimica Fundamental; Torquato, R.A. [Universidade Federal da Paraiba (UFPB), Joao Pessoa, PB (Brazil). Dept. de Engenharia de Materiais

    2017-07-15

    Titanium dioxide (TiO{sub 2}) stands out for use in various applications mainly due to its properties of thermal and chemical stability and its excellent optical properties. However, these properties are dependent on the type and phase morphology, which is related to the TiO{sub 2} processing method. Thus, this paper proposed to synthesize TiO{sub 2} nanoparticles by polymeric precursor method with different polymorphs, and evaluate the influence of these phases in the photoluminescent properties. For this, the stoichiometric molar proportions of citric acid:metallic cations of 1:1, 2:1, 3:1, 4:1 and 5:1 were investigated. The nanoparticles were characterized by X-ray diffraction (XRD), infrared spectroscopy, textural analysis, scanning electron microscopy (SEM), excitation and emission spectroscopy and determination of the band gap by UV-Vis diffuse reflectance spectroscopy. The presence of anatase and rutile was confirmed by XRD in different proportions for each sample. The agglomerate size increased with the citric acid/metal cations ratio as observed by SEM. Concerning photoluminescence, the maximum intensity in the emission spectrum occurred at the wavelength of 533 nm for the 3:1 sample and the maximum intensity in the excitation spectrum occurred for the 2:1 sample at the wavelength of 451 nm. (author)

  19. Covering localization, mapping and evaluation of ducts, using Pipeline Current Mapper Methods (PCM); Localizacao, mapeamento e avaliacao de revestimento de dutos, utilizando o metodo Pipeline Current Mapper (PCM)

    Energy Technology Data Exchange (ETDEWEB)

    Furquim, Antonio Jorge [ESTEIO Engenharia e Aerolevantamentos S.A., Curitiba, PR (Brazil)

    2005-07-01

    Esteio Engenharia e Aerolevantamentos S.A., together with the PETROBRAS - Petroleo Brasileiro S.A., comes accomplishing the Location, Geo positioning, Mapping and Inspection of the Coating in more than 5.000 km of pipes in several areas of the country. The works come being executed seeking the obtaining of the real position of Ducts (They-Built) and the conditions in that meets the coating of the same ones. The risings base on the method Pipeline Current Mapper (PCM), using the equipment of production of Radio detection to locate and to inspect the conditions of the coating. This work presents the results, analyses, precision, benefits and difficulties found during the execution of the surveying. (author)

  20. Evaluation of the reconstruction method and effect of partial volume in brain scintiscanning; Avaliacao do metodo de reconstrucao e efeito do volume parcial em cintilografia cerebral

    Energy Technology Data Exchange (ETDEWEB)

    Pinheiro, Monica Araujo

    2016-10-01

    Alzheimer's disease is a neurodegenerative disorder, on which occurs a progressive and irreversible destruction of neurons. According to the World Health Organization (WHO) 35.6 million people are living with dementia, being recommended that governments prioritize early diagnosis techniques. Laboratory and psychological tests for cognitive assessment are conducted and further complemented by neurological imaging from nuclear medicine exams in order to establish an accurate diagnosis. The image quality evaluation and reconstruction process effects are important tools in clinical routine. In the present work, these quality parameters were studied, and the effects of partial volume (PVE) for lesions of different sizes and geometries that are attributed to the limited resolution of the equipment. In dementia diagnosis, this effect can be confused with intake losses due to cerebral cortex atrophy. The evaluation was conducted by two phantoms of different shapes as suggested by (a) American College of Radiology (ACR) and (b) National Electrical Manufacturers Association (NEMA) for Contrast, Contrast-to-Noise Ratio (CNR) and Recovery Coefficient (RC) calculation versus lesions shape and size. Technetium-99m radionuclide was used in a local brain scintigraphy protocol, for proportions lesion to background of 2:1, 4:1, 6:1, 8:1 and 10:1. Fourteen reconstruction methods were used for each concentration applying different filters and algorithms. Before the analysis of all image properties, the conclusion is that the predominant effect is the partial volume, leading to errors of measurement of more than 80%. Furthermore, it was demonstrate that the most effective method of reconstruction is FBP with Metz filter, providing better contrast and contrast to noise ratio results. In addition, this method shows the best Recovery Coefficients correction for each lesion. The ACR phantom showed the best results assigned to a more precise reconstruction of a cylinder, which does not occur with spherical lesions in the NEMA simulator. The obtained RC values can be applied to correct the lesions quantification for different sizes and intake relations, assisting medical staff in the quantification process and an accurate diagnosis. Each Nuclear Medicine Service should establish its own RC levels to improve quality of the service provided to the population. (author)

  1. Method for evaluating the applicability and application rate wastes in soil; Metodo para avaliacao da aplicabilidade e taxa de aplicacao de residuos em solo

    Energy Technology Data Exchange (ETDEWEB)

    Linhares, Monica Moreira [Partime (Brazil); Seabra, Paulo Negrais [PETROBRAS, Rio de Janeiro, RJ (Brazil). Centro de Pesquisas

    1991-01-01

    Land treatment of refinery solid wastes has been practiced in the last few years by some PETROBRAS refineries. The biodegradation process is dynamic and complex, and incorrect monitoring may destroy the potential of the soil. Due to great differences both in terms of soils and of residues, each case must be monitored individually. We therefore developed a monitoring method for land farming systems based on the impact of the waste on indigenous soil microbial populations. The method is extremely simple, requiring only a gas chromatograph to evaluate the CO{sub 2} evolution, and can detect possible causes for low efficiency biodegradation processes. Conditions should then be altered, to ensure adequate functioning of the system.The method also allows for determination of the applicability of candidate wastes and of acceptable waste application rates in soil. (author) 2 refs., 7 figs.

  2. Evaluation of occupational exposure in interventionist procedures using Monte Carlo Method; Avaliacao das exposicoes dos envolvidos em procedimentos intervencionistas usando metodo Monte Carlo

    Energy Technology Data Exchange (ETDEWEB)

    Santos, William S.; Neves, Lucio P.; Perini, Ana P.; Caldas, Linda V.E., E-mail: williathan@yahoo.com.br [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil); Belinato, Walmir; Maia, Ana F. [Universidade Federal de Sergipe (UFS), Sao Cristovao, SE (Brazil). Departamento de Fisica

    2014-07-01

    This study presents a computational model of exposure for a patient, cardiologist and nurse in a typical scenario of cardiac interventional procedures. In this case a set of conversion coefficient (CC) for effective dose (E) in terms of kerma-area product (KAP) for all individuals involved using seven different energy spectra and eight beam projections. The CC was also calculated for the entrance skin dose (ESD) normalized to the PKA for the patient. All individuals were represented by anthropomorphic phantoms incorporated in a radiation transport code based on Monte Carlo simulation. (author)

  3. Method of evaluation of diagnostics reference levels in computerized tomography; Metodo de avaliacao de niveis de referencia de radiodiagnostico em tomografia computadorizada

    Energy Technology Data Exchange (ETDEWEB)

    Vega, Walter Flores

    1999-04-01

    Computerized tomography is a complex technique with several selectable exposition parameters delivering high doses to the patient. In this work it was developed a simple methodology to evaluate diagnostic reference levels in computerized tomography, using the concept of Multiple Scan Average Dose (MSAD), recently adopted by the Health Ministry. For evaluation of the MSAD, a dose distribution was obtained through a measured dose profile on the axial axis of a water phantom with thermoluminescence dosemeters, TLD-100, for different exam technique. The MSAD was evaluated hrough two distinct methods. First, it was evaluated by the integration of the dose profile of a single slice and, second, obtained by the integration on central slice of the profile of several slices. The latter is in of accordance with the ionization chamber method, suggesting to be the most practical method of dose evaluation to be applied in the diagnostic reference level assessment routine for CT, using TLDs. (author)

  4. Magnetic resonance imaging evaluation of traumatic muscle injuries; Avaliacao por ressonancia magnetica das injurias musculares traumaticas

    Energy Technology Data Exchange (ETDEWEB)

    Dias, Elisa Pompeu [Santa Casa de Misericordia do Rio de Janeiro, RJ (Brazil); Marchiori, Edson [Universidade Federal Fluminense, Niteroi, RJ (Brazil). Dept. de Radiologia; Coutinho Junior, Antonio Carlos; Domingues, Romulo Cortes; Domingues, Romeu Cortes [Centro Medico Barrashopping, Rio de Janeiro, RJ (Brazil). Clinica de Diagnostico por Imagem (CDPI)

    2001-12-01

    We evaluated 43 magnetic resonance scans of the leg or thigh of patients suffering from sports trauma. Strains were the most frequent lesions observed. These lesions presented iso- or hypointense signal on T1 and hyperintense signal on T2 images, and were classified according to the intensity of the injury of the fibers into grades 1, 2 and 3. The second most common lesions in these series were contusions that appeared iso- or hypointense on T1 and hyperintense on T2 images. Fibrosis was also observed as low signal lesions on T1 and T2 images. (author)

  5. Cerebral toxoplasmosis in AIDS - computerized tomography evaluation; Toxoplasmose cerebral na SIDA - avaliacao por tomografia computadorizada

    Energy Technology Data Exchange (ETDEWEB)

    Alves, Regina Coeli Fonseca [Universidade Federal Fluminense, Niteroi, RJ (Brazil). Hospital Universitario Antonio Pedro. Servico de Radiologia; Narchiori, Edson [Universidade Federal Fluminense, Niteroi, RJ (Brazil). Dept. de Radiologia

    1999-06-01

    Cerebral toxoplasmosis is a disease that affects many AIDS's patients. FOr this paper 46 patients with confirmed cases of cerebral toxoplasmosis who did a CT scan between March, 1994 and September, 1997 were examined. Single lesions were found in 28.3% of the patients. The lesions were more frequently detected in the basal ganglia and the frontal lobes. No lesion was larger than 4 cm. As regards the contrast enhancing of the lesions on a CT scan we observed that 54.5% of the lesions had a ring-like contrast enhancing, 36.4% had a nodular contrast enhancing and 6% had a heterogeneous form. After the 21st day of treatment we noticed an improvement in the aspect of the patients'lesions. The improvement of the lesions could be seen through a reduction of the edematous halo, a reduction of the lesion size and a modification in the contrast enhancing on the CT scan. The CT scan was an important method to demonstrate the lesions compatibility enhancing on the CT scan. The CT scan was an important method to demonstrate the lesions compatibility with cerebral toxoplasmosis, as well as to monitor these patients during treatment. (author)

  6. Imaging assessment of osteitis pubis; Avaliacao por imagem da osteite pubica

    Energy Technology Data Exchange (ETDEWEB)

    Lopes, Alexia Abuhid; Ferreira, Ana Paula Alves; Leite, Ana Rachel Albuquerque de Moura; Guido, Daniela Araujo; Rodrigues, Rogeria Nobre [Axial Centro de Imagem, Belo Horizonte, MG (Brazil)]. E-mail: ce@cidbh.com.br; Araujo, Rodrigo Otavio Dias [Minas Tenis Clube, Belo Horizonte, MG (Brazil); Lasmar, Rodrigo Campos Pace [Faculdade de Ciencias Medicas de Minas Gerais, Belo Horizonte, MG (Brazil). Curso de Fisioterapia

    2005-10-15

    Objective: to assess the physiopathological aspects of osteitis pubis and the findings seen on imaging methods, emphasizing the usefulness of Flamingo view radiographs and the diagnostic aspects of Magnetic resonance images. Material and Method: magnetic resonance images of ten patients (eight of them professional athletes) referring symptoms in the inguinal regional were retrospectively evaluated. For some of these patients Flaming view radiographs were performed. Results: in all studied patients magnetic resonance imaging was the only diagnostic method capable of showing the different phases os osteitis pubis, from acute cases with pubic bone marrow edematous changes to chronic cases with involvement of other pelvic joints. Flamingo view radiographs were performed in six patients and three of them were diagnosed with vertical pubis symphyseal instability greater than 2 mm of vertical displacement. This diagnosis was confirmed by instability tests using orthopedic manoeuvres. Conclusion: magnetic resonance imaging was the most helpful method for the diagnosis of different phases of osteitis pubis whereas conventional X-ray was inconclusive in the initial phases. Flamingo view radiographs were extremely important to show vertical instability of the pubic symphysis, which in combination with osteitis pubis can be the cause of failure of nonoperative treatment. (author)

  7. Computed tomography evaluation of mast cell tumours; Avaliacao por tomografia computadorizada dos mastocitomas

    Energy Technology Data Exchange (ETDEWEB)

    Lorigados, Carla Aparecida Batista; Matera, Julia Maria; Macedo, Thais; Pinto, Ana Carolina Brandao Fonseca, E-mail: clorigados@usp.br [Universidade de Sao Paulo (USP), SP (Brazil). Faculdade de Medicina Veterinaria e Zootecnia. Dept. de Cirurgia

    2012-07-01

    The mast cell tumours are common tumours of the canine skin. Computed tomography (CT) has assumed an important role in tumours evaluation and staging. The aim of this study was to evaluate the role of CT as a method of assessing characteristics of mast cell tumors. Ten dogs with mast cell tumor were evaluated. CT was performed before and after the intravenous injection of hydro soluble ionic iodine. Attenuation, contrast enhancement, cleavage with adjacent tissues and the unidimensional measurement of each lesion was determined in it maximum diameter, in transversal plane. Concerning the attenuation characteristic, 50% were homogeneous and 50% heterogeneous. The contrast enhancement was homogeneous in 50% of cases, heterogeneous in 40% and peripheral in 10%. Fifty percent of the tumours showed loss of plane of cleavage and 30% partial loss. This information can help in directing the patients that will be undergoing chemotherapy or surgery. (author)

  8. Gastroesophageal reflux diagnosis by scintigraphic method - a comparison among different methods; Diagnostico de refluxo gastro-esofagico por metodo cintilografico - correlacao com outros metodos

    Energy Technology Data Exchange (ETDEWEB)

    Cruz, Maria das Gracas de Almedia; Penas, Maria Exposito; Maliska, Carmelindo; Fonseca, Lea Miriam B. da; Lemme, Eponina M.; Campos, Deisy Guacyaba S.; Rebelo, Ana Maria de O.; Martinho, Maria Jose R.; Dias, Vera Maria [Hospital Universitario Clementino Fraga Filho, Rio de Janeiro, RJ (Brazil). Servico de Medicina Nuclear

    1996-07-01

    The gastroesophageal reflux disease is characterized by the return of gastric liquid to the esophagus which can origin the reflux esophagitis. The aim is to evaluate the contribution of dynamic quality scintigraphy of reflux (CTR) in the diagnosis of DRGE. We studied a ground of sick people with typical symptoms and compared the results given by digestive endoscopy (EDA), the histopathology and 24 hours pHmetry. There have been evaluated 24 healthy individuals and 97 who were sick. The first ones were submitted to CTR. In 20 controlled and 34 patients, the reflux index (IR) was determined by the evaluation of the reflux material percentage in relation to the basal activity. All the sick patients were submitted to CTR and EDA. This one classified them in: group A with esophagitis 45 patients (46,4%) where 14 did the biopsy of the third segment/part from the esophagus and 16 did the long pHmetry and group B without esophagitis = 52 patients (53.6%), 26 did the biopsy and 36 the pHmetry. In group A the CTR was positive in 38 (84%), the biopsy showed esophagitis in 11 (78,6%) and the pHmetry showed normal reflux in 14 (87,5%). The positivity of the same exams in group B were of 42 (81%), 11 (42,3%) and 19 (53%) respectively. The IR were determined to the controls and the measure to the patients were of 59% and 106% respectively as p<0,0001 (test from Mann Whitney). The correlation of CTR with the other methods showed sensitivity of 84,1%, specificity of 95,8%, positive predictive value of 98,3% and negative predictive value of 67,7%. As it was showed the authors concluded that the scintigraphy method can confirm the diagnosis of DRGE in patients of typical symptomology which canbe recommended by the initial of investigation method in these conditions. (author)

  9. Application of the identification methods from Hilbert and Prony to the study of oscillatory phenomena in electrical power systems; Aplicacion de los metodos de identificacion de Hilbert y Prony al estudio de fenomenos oscilatorios en sistemas electricos de potencia

    Energy Technology Data Exchange (ETDEWEB)

    Andrade Soto, Manuel Antonio

    2002-10-15

    In the present thesis work the application of identification techniques is investigated based on methods of spectral analysis to the study of the instantaneous characteristics of signals obtained by means of digital simulation of the dynamic behavior of the power system. The study focuses on the perspectives developed from two different approaches of analysis: the use of lineal methods of spectral analysis and the use of methods of non-lineal analysis, based on the concept of an analytical signal. The developed tools are applied to the study of two phenomena of electromechanical origin of different characteristics in complex power systems. A comparison between the results obtained is performed for these techniques and the possibility of its application is discussed for the problem of on-line identification in power systems. [Spanish] En el presente trabajo de tesis se investiga la aplicacion de tecnicas de identificacion basadas en metodos de analisis espectral al estudio de las caracteristicas instantaneas de senales obtenidas mediante simulacion digital del comportamiento dinamico del sistema de potencia. El estudio se centra en las aproximaciones desarrolladas desde dos enfoques distintos de analisis: la utilizacion de metodos lineales de analisis espectral y la utilizacion de metodos de analisis no lineal, basados en el concepto de una senal analitica. Las herramientas desarrolladas se aplican al estudio de dos fenomenos de origen electromecanico de caracteristicas distintas en sistemas complejos de potencia. Se hace una comparacion entre los resultados obtenidos por estas tecnicas y se discute la posibilidad de su aplicacion al problema de identificacion en linea en sistemas de potencia.

  10. Determinación de aminas aromaticas por cromatografia liquida de alta resolución.

    OpenAIRE

    Gutiérrez Bouzán, Mª Carmen; Crespi Rosell, Martí

    1989-01-01

    Este trabajo consiste en la puesta a punto del metodo analítico para la determinación por cromatografia liquida de alta resolución (HPLC) de las aminas aromáticas empleadas más frecuentemente en la fabricación de colorantes sulfurosos: m-tolilendiamina, p-fenilendiamina, o-toluidina, p-toluidina, anilina, p-aminofenol, difenilamina, y p-hidroxidifenilamina. La longitud de onda de detección es de 260 nm. El principal objetivo del presente estudio es la consecución de un método de análisis p...

  11. Critical Consideration of the Methods of Calculation Used in the Evaluation of the Absorbed Dose to the Skin in Cases of External Contamination; Observations Critiques sur les Methodes de Calcul Utilisees pour l'Evaluacion de la Dose Absorbee par la Peau en Cas de Contamination Externe; 041a 0420 0414 ; Observaciones Criticas Sobre los Metodos de Calculo Utilizados para Evaluar la Dosis Absorbida por la Piel en Caso de Contaminacion Externa

    Energy Technology Data Exchange (ETDEWEB)

    Casnati, E.; Breuer, F. [Gruppo di Dosimetria e Standardizzazione, CNEN, Centro di Studi Nucleari della Casaccia, Rome (Italy)

    1965-06-15

    resultats permettent de conclure que, dans la geometrie consideree, on peut determiner par des formules de type exponentielle, d'une part la dose imputable aux rayons beta et, d'autre part, la dose imputable aux rayons gamma pour la couche basale de la peau;- on peut considerer les resultats comme acceptables du point de vue de la radioprotection. (author) [Spanish] La dosis absorbida, suele calcularse mediante la formula de Loevinger cuando se trate de particulas beta mientras que para las radiaciones electromagneticas se recurre habitualmente a una formula exponencial. En la memoria, los autores se proponen examinar si en el caso de contaminacion cutanea puede considerarse satisfactorio el empleo de una formula exponencial (la formula de Rossi y Ellis) y de una formula similar para calcular la dosis beta y la dosis gamma, respectivamente. Con este objeto, se han comparado los resultados.obtenidos para este tipo especial de geometria por medio de la formula de Rossi y Ellis y con la formula de Loevinger para partfculas beta; por lo que respecta a la radiacion gamma, se han comparado los valores obtenidos mediante la formula exponencial y con otras dos formulas mas complejas, que se ajustan a las condiciones de acumulacion fotonica maxima nula, respectivamente. Estos resultados permiten sacar la conclusion de que, dadas las condiciones geometricas de que se trata, pueden determinarse mediante la formula de tipo exponencial tanto la dosis de radiacion beta como la dosis de radiacion gamma en la dermis. Los resultados son aceptables desde el punto de vista de la proteccion radiologica. (author) [Russian] Obychno pri podschete dozy ispol'zuetsja formula Laevingera dlja chastic i jeksponencial'naja formula dlja jelektromagnitnyh izluchenij. V doklade rassmatrivaetsja vopros o tom, mozhno li schitat' udovletvoritel'nym ispol'zovanie jeksponencial'noj formuly (podobnoj formule Rossi i Jellisa) i analogichnyh formul pri podschete sootvetstvenno beta- i gamma-dozy. S jetoj cel

  12. DOLOČITEV POVRŠINSKE NAPETOSTI Z METODO KAPILARNEGA DVIGA DVOFAZNIH SISTEMOV

    OpenAIRE

    Kravanja, Gregor

    2014-01-01

    Namen magistrske naloge je bil postavitev merilne naprave in razvoj nove metode merjenja površinske napetosti s kapilarnim dvigom dvofaznih sistemov v okolici kritične točke. Za pridobitev natančnih in primerljivih meritev je bilo potrebno poznati natančni notranji premer tankih kapilar. Določili smo ga z metodo laserskega tipanja na nemški koordinatni merilni napravi ZEISS tipa UMC-850 s pomočjo merilne programske opreme CALYPSO 5.1.4. Za merjenje ravnotežne višine smo uporabili računalniški...

  13. Impacto orcamentario da utilizacao do Metodo Canguru no cuidado neonatal

    Directory of Open Access Journals (Sweden)

    Aline Piovezan Entringer

    2013-10-01

    Full Text Available OBJETIVO Estimar o impacto orçamentário da utilização do Método Canguru na rede municipal de saúde. MÉTODOS Um modelo de decisão analítico foi desenvolvido para simular os custos do Método Canguru e Unidade Intermediária Neonatal no Rio de Janeiro, RJ, em 2011. A população de referência foi constituída pelos recém-nascidos estáveis clinicamente, que podem receber assistência nas duas modalidades de cuidado. O impacto orçamentário foi estimado para uma coorte hipotética de 1.000 recém-nascidos elegíveis em um ano. A proporção de recém-nascidos elegíveis que recebem assistência nas duas modalidades foi obtida por coleta de dados nas maternidades incluídas no estudo. As probabilidades dos eventos e o consumo de recursos de saúde, no período da assistência, foram incorporados ao modelo. Cenários foram desenvolvidos para refletir a adoção do método Canguru em maior ou menor escala. RESULTADOS A utilização do Método Canguru significou redução de gastos equivalente a 16% em um ano, se todos os recém-nascidos elegíveis fossem assistidos por esse método. CONCLUSÕES A opção Método Canguru é de menor custo comparado com a da Unidade Intermediária Neonatal. A análise de impacto orçamentário da utilização desse método no Sistema Único de Saúde indicou economia importante para o período de um ano.

  14. Application of numerical analysis methods to thermoluminescence dosimetry; Aplicacion de metodos de analisis numerico a la dosimetria por termoluminiscencia

    Energy Technology Data Exchange (ETDEWEB)

    Gomez Ros, J M; Delgado, A

    1989-07-01

    This report presents the application of numerical methods to thermoluminescence dosimetry (TLD), showing the advantages obtained over conventional evaluation systems. Different configurations of the analysis method are presented to operate in specific dosimetric applications of TLD, such as environmental monitoring and mailed dosimetry systems for quality assurance in radiotherapy facilities. (Author) 10 refs.

  15. Carbon/Clay nanostructured composite obtained by hydrothermal method; Compositos nanoestruturados carbono/argila obtidos por metodo hidotermico

    Energy Technology Data Exchange (ETDEWEB)

    Barin, G.B.; Bispo, T.S.; Gimenez, I.F.; Barreto, L.S., E-mail: gabriela.borin@gmail.co [Universidade Federal de Sergipe (UFS), Aracaju, SE (Brazil). Programa de Pos-Graduacao em Ciencia e Engenharia de Materiais; Souza Filho, A.G. [Universidade Federal do Ceara (UFC), Fortaleza, CE (Brazil). Dept. de Fisica

    2010-07-01

    The development of strategies for converting biomass into useful materials, more efficient energy carrier and / or hydrogen storage is shown a key issue for the present and future. Carbon nanostructure can be obtained by severe processing techniques such as arc discharge, chemical deposition and catalyzed pyrolysis of organic compounds. In this study we used hydrothermal methods for obtaining nanostructured composites of carbon / clay. To this end, we used coir dust and special clays. The samples were characterized by infrared spectroscopy, X-ray diffraction and Raman. The presence of the D band at 1350 cm{sup -1} in the Raman spectrum shows the formation of amorphous carbon with particle size of about 8.85 nm. (author)

  16. PREVALENCIA DE BOCIO ENDEMICO POR EL METODO ECOGRAFICO, DETERMINACION DE YODURIAS y YODO EN SAL EN ESCOLARES DEL PARAGUAY.

    OpenAIRE

    Jara Y, Jorge A; Pretell, Eduardo A; Zaracho de Irazusta, Juana; Goetting, Sonia; Riveros, Claudia

    2004-01-01

    Paraguay, país mediterráneo ubicado en el corazón de America del Sur, con una superficie de 406.542 Km2 y con una población de 5,8 millones de habitantes importa toda la sal que consume de países cercanos como la Argentina, Brasil y Chile. En el presente estudio observacional, de tipo descriptivo utiliza el método ecográfico para determinar el tamaño y las características de la glándula tiroides, se examinaron 1034 escolares de ambos sexos de 13 distritos del país y fue realizado durante 3 me...

  17. Reconstruction of the limit cycles by the delays method; Reconstruccion de ciclos limite por el metodo de los retardos

    Energy Technology Data Exchange (ETDEWEB)

    Castillo D, R.; Ortiz V, J. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico); Calleros M, G. [CFE, CNLV, Alto Lucero, Veracruz (Mexico)]. e-mail: rcd@nuclear.inin.mx

    2003-07-01

    The boiling water reactors (BWRs) are designed for usually to operate in a stable-lineal regime. In a limit cycle the behavior of the one system is no lineal-stable. In a BWR, instabilities of nuclear- thermohydraulics nature can take the reactor to a limit cycle. The limit cycles should to be avoided since the oscillations of power can cause thermal fatigue to the fuel and/or shroud. In this work the employment of the delays method is analyzed for its application in the detection of limit cycles in a nuclear power plant. The foundations of the method and it application to power signals to different operation conditions are presented. The analyzed signals are: to steady state, nuclear-thermohydraulic instability, a non linear transitory and, finally, failure of a controller plant . Among the main results it was found that the delays method can be applied to detect limit cycles in the power monitors of the BWR reactors. It was also found that the first zero of the autocorrelation function is an appropriate approach to select the delay in the detection of limit cycles, for the analyzed cases. (Author)

  18. Laser cladding to select new glassy alloys; Uso do metodo de revestimento por laser na selecao de novas ligas vitreas

    Energy Technology Data Exchange (ETDEWEB)

    Medrano, L.L.O.; Afonso, C.R.M.; Kiminami, C.S.; Gargarella, P., E-mail: eomedranos@hotmail.com [Universidade Federal de Sao Carlos (UFSCar), SP (Brazil). Departamento de Engenharia de Materiais; Vilar, R. [Instituto Superior Tecnico, Departamento de Engenharia Quimica, Lisboa (Portugal); Ramasco, B. [Whirlpool Latin America, Rio Claro, SP (Brazil)

    2016-07-01

    A new experimental technique used to analyze the effect of compositional variation and cooling rate in the phase formation in a multicomponent system is the laser cladding. This work have evaluated the use of laser cladding to discover a new bulk metallic glass (BMG) in the Al-Co-Zr system. Coatings with composition variation have made by laser cladding using Al-Co-Zr alloys powders and the samples produced have been characterized by X ray diffraction, microscopy and energy-dispersive X-ray spectroscopy. The results did not show the composition variation as expected, because of incomplete melting during laser process. It was measured a composition variation tendency that allowed the glass forming investigation by the glass formation criterion λ+Δh{sup 1/2}. The results have showed no glass formation in the coating samples, which prove a limited capacity of Zr-Co-Al system to form glass (author)

  19. Thermochemical methods for the treatment of oil contaminated sand; Metodo termoquimico para tratamento de areia contaminada por oleo

    Energy Technology Data Exchange (ETDEWEB)

    Pimenta, Rosana C.G.M. [Fundacao Jose Bonifacio, Rio de Janeiro, RJ (Brazil); Khalil, Carlos N. [PETROBRAS S.A., Rio de Janeiro, RJ (Brazil)

    2003-07-01

    The Nitrogen Generating System (SGN in Portuguese) is a thermochemical method first developed for cleaning and removal of paraffin deposits in production and export pipelines. SGN is based on a redox chemical reaction between two salts which is catalyzed in acidic pH. The reaction is strongly exothermic and its products are nitrogen, sodium chloride, water and heat. All reaction products are harmless to the environment. In January 2000 there was a major oil spill in Guanabara Bay, Rio de Janeiro, which contaminated 2400 tons of sand. This work, developed at PETROBRAS Research Center (CENPES), was based on SGN technology which has been adapted for cleaning contaminated sand and recovering of spilled oil. By combining simultaneous effects of the SGN treatment such as heating, turbulence and floatation, one can remove, within 98% of efficiency, spilling oil from contaminated sand and removed oil can be securely returned to refining process. SGN technology has proved to be efficient, fast, low cost and ecologically correct method for cleaning contaminated sand and can be applied in loco right after a contamination event. (author)

  20. Thermochemical method for the treatment of oil contaminated sand; Metodo termoquimico para tratamento de areia contaminada por oleo

    Energy Technology Data Exchange (ETDEWEB)

    Pimenta, Rosana C.G.M. [Fundacao Gorceix, Ouro Preto, MG (Brazil)]|[PETROBRAS S.A., Rio de Janeiro, RJ (Brazil); Khalil, Carlos N. [PETROBRAS, Rio de Janeiro, RJ (Brazil). Centro de Pesquisas (CENPES)

    2004-07-01

    In January 2000 there was a major oil spill in Guanabara Bay, Rio de Janeiro, which contaminated 2400 tons of sand. This work, based on NGS (Nitrogen Generating System) technology, was adapted for cleaning contaminated sand and recovering of spilled oil. NGS is a thermochemical method first developed for removal of paraffin deposits in production and export pipelines. The method is based on a strongly exothermic redox chemical reaction between two salts catalyzed in acidic pH. The reaction products are harmless to the environment and consist of nitrogen, sodium chloride, water and heat. By combining simultaneous effects of the treatment such as heating, turbulence and floatation, one can remove, within 98% of efficiency, spilling oil from contaminated sand. After treatment, removed oil can be securely returned to refining process. The method has proved to be efficient, fast, low cost and ecologically correct method for cleaning contaminated sand and can be applied in place right after a contamination event. (author)

  1. Correlacion entre metodos de analisis de Zn disponible en cuatro ordenes de suelos de Costa Rica

    Directory of Open Access Journals (Sweden)

    Eloy Molina

    2001-01-01

    Full Text Available Se realizo una comparación entre métodos analisis del Zn disponible en 4 ordenes de sue- Analytilos de Costa Rica (Ultisoles, Vertisoles, Andisoles Inceptisoles, 25 de c/u, utilizando las siguientes soluciones extractoras: Olsen Modificado, Meh- lich 3, Morgan Modificado, DTPA y HC1. Las cantidades de Zn extrafdas dependieron de la natu- raleza qufmica de la solucion extractora. El HCl presento los contenidos mas altos de Zn en los chasuelos, excepto en Vertisoles. Las soluciones que hicontienen el agente quelante EDTA (Olsen Modi- ficado y Mehlich`3, extrajeron niveles interme- Modidios de Zn, en tanto que los metodos que contie- Den el quelato DTPA (Morgan Modificado y DT - PA, obtuvieron los valores mas bajos. Las corre- laciones de Zn extrafble entre los 5 metodos fue- signifirOD significativas en la mayona de los casos, tanto nivel de orden de suelos como en el conjunto de indivilos 100 suelos analizados. Los coeficientes de co- rrelacion mas altos, se presentaron entre Mehlich Morgan Modificado y DTPA. Las correlaciones Modifueron consistentes en los 4 ordenes, 10 que indica que estas soluciones poseen un amplio margen de adaptacion a diferentes tipos de suelo, siendo una caractenstica ventajosa para la selección de un metodo de analisis. El Olsen Modificado fue mas slighteficiente para la extraccion de Zn en suelos de pH ligeramente acido 0 neutro (Vertisoles e Inceptiso- les, que en suelos acidos (Ultisoles y Andisoles. EI HCI extrajo cantidades muy aItas de Zn que Moraparentementestan relacionadas con formas no disponibles para lag plantas. Se concluye que lag soluciones Mehlich 3, Morgan Modificado y DT - PA son semejantes en la forma de extraer Zn dispo- Dible, y podrian seT una altemativa para sustituir el metoda tradicional de Olsen Modificado utilizado en Costa Rica. Sin embargo,la eficiencia de ellas no puede seT establecida sino a traves de log estudios de correlacion contra rendimiento en invernadero y campo.

  2. Some Non-Destructive Testing Methods Applicable to Sintered Materials; Quelques Methodes d'Essais Non Destructifs Applicables aux Materiaux Frittes; Nekotorye metody nedestruktivnykh ispytanii, primenimye k spechennym materialam; Algunos Metodos de Ensayo No Destructivo Aplicables a los Materiales Sinterizados

    Energy Technology Data Exchange (ETDEWEB)

    Labusca, Elena; Mirion, I.; Andreescu, N.; Alecu, M.; Biscoveanu, I. [Institut de Physique Atomique, Bucarest (Romania)

    1965-10-15

    solides frittes, a l'aide de la metallographie et de la microscopie electronique. Ces methodes mettent en evidence l'homogeneite de la structure, les dimensions et l'orientation des grains, la presence de defauts divers (inclusions, pores) et revolution meme du processus de frittage, y compris la formation des cristaux, la croissance granulaire, etc. Dans quelques cas, on peut combiner l'examen microscopique a des essais de microdurete. Cet examen de la structure microcristalline represente l'une des methodes principales de controle qualitatif des materiaux frittes, et ne peut etre remplace par aucun autre moyen d'investigation. 2. Controle du degre de consolidation, qui determine essentiellement la qualite des materiaux frittes. Ce controle est effectue par la mesure de quelques proprietes, telles que la conductibilite electrique et thermique, en correlation avec la densite, etant donne que la conductibilite des materiaux frittes est directement porportionnelle au degre de frittage. On a essaye aussi une methode adequate de controle de la porosite; on a obtenu des donnees experimentales interessantes, surtout au point de vue de la porosite libre, laquelle est susceptible aux inclusions gazeuses. Le memoire contient des donnees experimentales concernant l'application de ces methodes de controle a quelques materiaux frittes interessants pour la technologie nucleaire. (author) [Spanish] Teniendo en cuenta la estructura granular especifica de los materiales sinterizados, elaborados a partir de polvos, cuyo proceso de consolidacion se desarrolla en funcion del tratamiento de sinterizacion, los autores han estudiado algunos metodos para verificar el grado de sinterizacion y controlar ciertas propiedades. Entre los metodos no destructivos utilizados, se mencionan en la presente memoria: 1. Examen de la estructura cristalina de los solidos sinterizados por metalografia y microscopfa electronica. Estos metodos ponen de manifiesto el giado de homogeneidad estructural, la dimension

  3. Osservazioni sul principio di legalità come idea e come metodo nell’esperienza giuridica della Chiesa

    Directory of Open Access Journals (Sweden)

    Beatrice Serra

    2012-10-01

    SOMMARIO: 1. Introduzione - 2. – La struttura essenziale del concetto di legalità e la sua realizzazione radicale nel diritto della Chiesa. - 3. L’idea di legalità come “regola che sta prima” nel ius commune e la sua coesistenza con un approccio empirico, essenzialmente giurisprudenziale e dottrinale, di costruzione del diritto. Il principio di legalità come metodo di produzione del diritto nel pensiero giuridico moderno- 4. Il legame storico-concettuale fra il principio di legalità e i Codici moderni - 5. Il Codex iuris canonici del 1917 e il principio di legalità come metodo di costruzione del ius ecclesiae in funzione della certezza del diritto - 6. (segueUlteriori riflessi della prima codificazione canonica sul principio di legalità.:

  4. AIDS related thoracic lymphoma: evaluation by computed tomography; Linfoma toracico na sindrome da imunodeficiencia adquirida: avaliacao por tomografia computadorizada

    Energy Technology Data Exchange (ETDEWEB)

    Siciliano, Antonio Alexandre de Oliveira [Hospital Universitario Clementino Fraga Filho, Rio de Janeiro, RJ (Brazil). Servico de Radiodiagnostico; Marchiori, Edson [Universidade Federal, Rio de Janeiro, RJ (Brazil). Curso de Pos-graduacao em Radiologia

    2000-02-01

    The authors reviewed five cases of patients with acquired immunodeficiency syndrome (AIDS) related lymphoma to describe the thoracic findings on computed tomography. The patients were followed at Hospital Universitario Clementino Fraga Filho, Hospital Universitario Antonio Pedro and Hospital da Lagoa, from November, 1989 to March 1998. Epidemiological, clinical and pathological data from these patients were quiet variable and pulmonary nodules and masses, hilar and mediastinal lymphadenopathy, and thoracic wall masses were observed. AIDS related lymphomas involving the chest are pleomorphic and most commonly extranodal. (author)

  5. Imaging assessment of isolated lesions affecting cranial nerve III; Avaliacao por imagem das lesoes isoladas do III par craniano

    Energy Technology Data Exchange (ETDEWEB)

    Garcia, Marcelo de Mattos [Colegio Brasileiro de Radiologia e Diagnostico por Imagem (CBR), Sao Paulo, SP (Brazil)]. E-mail: cidbh@cidbh.com.br; Martins, Jose Carlos Tadeu [Sociedade Brasileira de Neuroradiologia, Sao Paulo, SP (Brazil)

    2005-05-15

    The aim of this study is to review the anatomy and main pathologic conditions affecting cranial nerve III using imaging studies, particularly magnetic resonance imaging. Imaging methods are essential in the evaluation of patients with suspected lesions of the oculomotor nerve once signs and symptoms are unspecific and a large number of diseases can affect cranial nerve III. A brief review of the literature is also presented. (author)

  6. Evaluation of essential minerals in carioquinha beans by EDXRF; Avaliacao de minerais essenciais em feijao carioquinha por EDXRF

    Energy Technology Data Exchange (ETDEWEB)

    Paula, Ellen Cristina Alves de; Aquino, Reginaldo R. [Faculdades Metropolitanas Unidas (FMU), Sao Paulo, SP (Brazil); Scapin, Marcos A. [Instituto de Pesquisas Energeticas e Nucleares (IPEN-CNEN/SP), Sao Paulo, SP (Brazil)

    2013-07-01

    In this study, the levels of essential minerals in the carioquinha beans were analyzed by Energy Dispersive X-ray Fluorescence technique (EDXRF), searching determine the possible minerals, quantities and the correlation among different sources of same variety and the possible contribution of each to the human diet.

  7. Unilateral pulmonary veins atresia: evaluation by computed tomography; Atresia unilateral das veias pulmonares: avaliacao por tomografia computadorizada

    Energy Technology Data Exchange (ETDEWEB)

    Eifer, Diego Andre; Arsego, Felipe Veras, E-mail: felipesoarestorres@gmail.com [Hospital de Clinicas de Porto Alegre (HCPA), RS (Brazil). Serv. de Radiologia; Torres, Felipe Soares [Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS (Brazil). Escola de Medicina

    2013-11-15

    Unilateral pulmonary vein atresia is a rare congenital condition. In addition to cardiac malformations or pulmonary hypertension, patients may present with recurrent pulmonary infections or hemoptysis in childhood or adolescence. The authors report a case where the typical findings of such condition were observed at computed tomography in an adult patient. (author)

  8. Pulmonary leukemic involvement: high-resolution computed tomography evaluation; Comprometimento pulmonar nas leucemias: avaliacao por tomografia computadorizada de alta resolucao

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Ana Paola de [Universidade Federal, Rio de Janeiro, RJ (Brazil). Faculdade de Medicina. Programa de Pos-graduacao em Radiologia; Marchiori, Edson [Universidade Federal Fluminense, Niteroi, RJ (Brazil). Dept. de Radiologia; Souza, Junior, Arthur Soares [Faculdade de Medicina de Sao Jose do Rio Preto (FAMERP), SP (Brazil). Dept. de Radiologia

    2004-12-01

    Objective: To evaluate the role of high-resolution computed tomography (HRCT) in patients with leukemia and pulmonary symptoms, to establish the main patterns and to correlate them with the etiology. Materials and Methods: This is a retrospective study of the HRCT of 15 patients with leukemia and pulmonary symptoms. The examinations were performed using a spatial high-resolution protocol and were analyzed by two independent radiologists. Results: The main HRCT patterns found were ground-glass opacity (n=11), consolidation (n=9), airspace nodules (n=3), septal thickening (n=3), tree-in-bud pattern (n=3), and pleural effusion (n=3). Pulmonary infection was the most common finding seen in 12 patients: bacterial pneumonia (n=6), fungal infection (n = 4), pulmonary tuberculosis (n=1) and viral infection (n=1). Leukemic pleural infiltration (n=1), lymphoma (n=1) and pulmonary hemorrhage (n=1) were detected in the other three patients. Conclusion: HRCT is an important tool that may suggest the cause of lung involvement, its extension and in some cases to guide invasive procedures in patients with leukemia. (author)

  9. Evaluation of essential minerals in pumpkin seeds by EDXRF; Avaliacao de minerais essenciais em sementes de abobora moranga por EDXRF

    Energy Technology Data Exchange (ETDEWEB)

    Boaro, Flavia Araujo; Zacari, Cristiane Z. [Faculdades Metropolitanas Unidas (FMU), Sao Paulo, SP (Brazil); Scapin, Marcos A.; Aquino, Reginaldo R. [Instituto de Pesquisas Energeticas e Nucleares (IPEN-CNEN/SP), Sao Paulo, SP(Brazil)

    2013-07-01

    Pumpkin seeds, marketed in the Municipal Market of Sao Paulo, Brazil, were analyzed using the Energy Dispersive of X-ray Fluorescence technique (EDXRF) seeking to evaluate the content of the main essential minerals present in these seeds, and their contribution to human nutrition.

  10. Avaliacao de projeto de promocao da saude para adolescentes

    Directory of Open Access Journals (Sweden)

    Jovino Oliveira Ferreira

    2013-06-01

    Full Text Available OBJETIVO: Avaliar programa de promoção de atividade física e de escolhas alimentares entre adolescentes. MÉTODOS: Estudo transversal realizado com 911 adolescentes de 13 a 18 anos de idade, de escolas públicas de Goiânia, GO, em 2010. Os participantes foram divididos em dois grupos: intervenção (escolas participantes do Projeto Viver Saudável e controle. Foram considerados como atividade física: deslocamento, aulas de educação física na escola, atividade física fora da escola e no lazer. Foram definidos como ativos aqueles que acumularam 300 ou mais minutos por semana. Quanto às escolhas alimentares, foi classificado como adequado o consumo de alimentos protetores em cinco ou mais dias da semana. Foram realizadas análises estatísticas com teste de Qui-quadrado de Pearson. RESULTADOS: A maioria dos adolescentes foi identificada como inativos ou insuficientemente ativos, com 65,7% no grupo intervenção e 65,2% no grupo controle, sem diferenças significativas entre os grupos e com prevalência maior entre o sexo feminino. Pouco mais da metade dos adolescentes consumiam alimentos protetores da saúde em cinco ou mais dias da semana, sendo 56,6% e 50,4%, respectivamente, nos grupos intervenção e controle (p = 0,373. CONCLUSÕES: A ausência de diferenças quanto a escolhas alimentares e prática de atividade física entre os grupos intervenção e controle indica que o projeto Viver Saudável precisa ser reavaliado visando melhorar a efetividade no cumprimento dos seus objetivos.

  11. Efecto de la fuente nitrogenada sobre la capacidad de degradacio?n del petro?leo diesel 2 por Pseudomonas sp.

    OpenAIRE

    Otiniano-Garci?a, Ne?lida Milly

    2013-01-01

    Gran parte del desarrollo creciente de la sociedad moderna y contempora?nea se fundamenta en la explotacio?n de petro?leo, el aumento de la demanda de este hidrocarburo, implica un alto riesgo de derrames accidentales que pueden ser minimizados, mas no totalmente eliminados. La preocupacio?n por el medio ambiente aumento? despue?s de los grandes derrames que causaron graves dan?os en el ecosistema; en consecuencia, se desa- rrollaron te?cnicas que incluyen me?todos fi?sicos, qui?micos y biolo...

  12. Atlas de aves: Un metodo para documentar distribucion y seguir poblaciones

    Science.gov (United States)

    Robbins, C.S.; Dowell, B.A.; Dawson, D.K.; Alvarez-Lopez, Humberto; Kattan, Gustavo; Murcia, Carolina

    1988-01-01

    Los Atlas de Aves son proyectos nacionales o regionalies para trazar en mapas la distribucion en reproduccion de cada especie de ave. Ese procedimiento se esta usando en Europa, Australia, Nueva Zelanda, Norteamerica, y partes de Africa. El tama?o de los cuadrados varia de medio grado de latitud y Iongitud hasta 5 x 5 km. El trabajo de campo de cada proyecto exige aproxlmadamente cinco a?os, pero los aficionados pueden llevar a cabo la mayor parte del trabajo. Es posible almacenar los resultados en un computador personal. Hay muchos beneficios: (I) se presenta la distribucion corriente de las aves de la nacion, del estado, o de la Iocalidad; (2) se desarrolla nueva informacion especialmente sobre especies raras o en peligro; (3) se descubren areas que tienen una avlfauna sobresaliente o habitats raros y ayuda a su proteccion, (4) se documentan cambios de dlstribucion; (5) se pueden usar para documentar cambios de poblacion, especialmente en los tropicos donde otros metodos son mas dificiles de usar porque hay muchas especies y no hay muchos observadores calificados en la identificacion de sonidos de las aves; (6) son proyectos buenos de investigacion para estudiantes graduados; (7) los turistas y los jefes de excursiones de historia natural pueden contribuir con muchas informaciones

  13. Study radiolabeling of urea-based PSMA inhibitor with 68-Galliu: Comparative evaluation of automated and not automated methods; Estudo de radiomarcacao com Galio-68 do inibidor de PSMA baseado em ureia: avaliacao comparativa de metodo automatizado e nao automatizado

    Energy Technology Data Exchange (ETDEWEB)

    Alcarde, Lais Fernanda

    2016-07-01

    The methods for clinical diagnosis of prostate cancer include rectal examination and the dosage of the prostatic specific antigen (PSA). However, the PSA level is elevated in about 20 to 30% of cases related to benign pathologies, resulting in false positives and leading patients to unnecessary biopsies. The prostate specific membrane antigen (PSMA), in contrast, is over expressed in prostate cancer and founded at low levels in healthy organs. As a result, it stimulated the development of small molecule inhibitors of PSMA, which carry imaging agents to the tumor and are not affected by their microvasculature. Recent studies suggest that the HBED-CC chelator intrinsically contributes to the binding of the PSMA inhibitor peptide based on urea (Glu-urea-Lys) to the pharmacophore group. This work describes the optimization of radiolabeling conditions of PSMA-HBED-CC with {sup 68}Ga, using automated system (synthesis module) and no automated method, seeking to establish an appropriate condition to prepare this new radiopharmaceutical, with emphasis on the labeling yield and radiochemical purity of the product. It also aimed to evaluate the stability of the radiolabeled peptide in transport conditions and study the biological distribution of the radiopharmaceutical in healthy mice. The study of radiolabeling parameters enabled to define a non-automated method which resulted in high radiochemical purity (> 95 %) without the need for purification of the labeled peptide. The automated method has been adapted, using a module of synthesis and software already available at IPEN, and also resulted in high synthetic yield (≥ 90%) specially when compared with those described in the literature, with the associated benefit of greater control of the production process in compliance with Good Manufacturing Practices. The study of radiolabeling parameters afforded the PSMA-HBED-CC-{sup 68}Ga with higher specific activity than observed in published clinical studies (≥ 140,0 GBq/μmol), with a sufficiently long stability, which will enable transport to clinics for use in diagnostic imaging. Biodistribution and pharmacokinetic profiles of the radiolabeled peptide were consistent with those founded in the literature. We concluded that PSMA-HBED-CC-{sup 68}Ga, important diagnostic tool for prostate cancer imaging with PET, can be produced by either automated or not automated method with high radiochemical purity, high synthetic yield and stability of the radiopharmaceutical. (author)

  14. Use of the 3DVH Software as a complementary method of IMRT pretreatment evaluation; Utilizacao do Software 3DVH como metodo complementar de avaliacao de pre-tratamento de IMRT

    Energy Technology Data Exchange (ETDEWEB)

    Lyra, Jesse G.P.; Bruning, Fabio F.; Funchal, Melissa; Toledo, Hugo V.; Bornatto, Pricila; Fernandes, Tatiane C.O., E-mail: jesse_lyra@hotmail.com [Hospital Erasto Gaertner / Liga Paranaense de Combate ao Cancer (LPCC), Departamento de Radioterapia, Curitiba, PR (Brazil)

    2013-04-15

    The aim of this study is to compare the method of treatment planning evaluation for IMRT using the gamma index to the method of the 3DVH Software. The 3DVH Software was used with the MapCheck2 detector 2D array under a 6MV x-ray beam of linear accelerator equipped with 120 leafs MLC. Nine treatment plans of prostate patients chose randomly and fully anonimatize were performed in the Eclipse planning system, using the AAA calculation algorithm in IMRT sliding window technique. These plans were approved and treated according to the gamma analysis criteria of the institution. The comparisons were made in absolute dose and normalized at maximum dose for each field and then with the 3DVH Software the Dmax, Dmean, D15%, D25%, D35% and D50% parameters for the bladder and rectum, Dmean for the bulb, Dmax for the femur and D95% for the PTV were evaluated. In the planar analysis by field, the plans studied had a minimum of 97.5% approval. The PTV-related differences have relative variation from 1.3 to 2.2%, that is, greater coverage than expected for this structure. For the organs at risk, the relative differences observed were between -5.3 to 25.8%, which could result in a non-approved plan if these variations are close to the clinical tolerances of the OAR. The results show that even a plan compatible with greater than or equal to 95% of the points, the gamma analysis does not give enough information if this plan can or cannot be approved for treatment and that there is a need for more detailed verification of the plan which considers not only the planar evaluation, but also the evaluation of the DVH measured, and the 3DVH Software proved be adequate for this analysis. (author)

  15. Evaluation of the shield calculation adequacy of radiotherapy rooms through Monte Carlo Method and experimental measures; Avaliacao da adequacao do calculo de blindagens de salas de radioterapia atraves do metodo de Monte Carlos e medidas experimentais

    Energy Technology Data Exchange (ETDEWEB)

    Meireles, Ramiro Conceicao

    2016-07-01

    The shielding calculation methodology for radiotherapy services adopted in Brazil and in several countries is that described in publication 151 of the National Council on Radiation Protection and Measurements (NCRP 151). This methodology however, markedly employs several approaches that can impact both in the construction cost and in the radiological safety of the facility. Although this methodology is currently well established by the high level of use, some parameters employed in the calculation methodology did not undergo to a detailed assessment to evaluate the impact of the various approaches considered. In this work the MCNP5 Monte Carlo code was used with the purpose of evaluating the above mentioned approaches. TVLs values were obtained for photons in conventional concrete (2.35g / cm{sup 3}), considering the energies of 6, 10 and 25 MeV, respectively, first considering an isotropic radiation source impinging perpendicular to the barriers, and subsequently a lead head shielding emitting a shaped beam, in the format of a pyramid trunk. Primary barriers safety margins, taking in account the head shielding emitting photon beam pyramid-shaped in the energies of 6, 10, 15 and 18 MeV were assessed. A study was conducted considering the attenuation provided by the patient's body in the energies of 6,10, 15 and 18 MeV, leading to new attenuation factors. Experimental measurements were performed in a real radiotherapy room, in order to map the leakage radiation emitted by the accelerator head shielding and the results obtained were employed in the Monte Carlo simulation, as well as to validate the entire study. The study results indicate that the TVLs values provided by (NCRP, 2005) show discrepancies in comparison with the values obtained by simulation and that there may be some barriers that are calculated with insufficient thickness. Furthermore, the simulation results show that the additional safety margins considered when calculating the width of the primary barrier of radiotherapy rooms are conservative. They also show that the attenuation provided by the patient's body decreases with increased energy, with the highest attenuation being 0.54, for the energy of 6 MeV. (author)

  16. Evaluation of fracture toughness in dental ceramics using indentation and SEVNB (Single Edge V-Notched Beam)-method; Avaliacao da tenacidade a fratura de ceramicas dentarias atraves do metodo de entalhe - SEVNB (Single Edge V-Notched Beam)

    Energy Technology Data Exchange (ETDEWEB)

    Santos, L.A.; Santos, C.; Souza, R.C.; Ribeiro, S. [Universidade de Sao Paulo (DEMAR/EEL/USP), Lorena, SP (Brazil). Escola de Engenharia de Lorena. Dept. de Engenharia de Materiais. Polo Urbo-Industrial; Strecker, K. [Universidade Federal de Sao Joao del-Rei (DME/UFSJ), MG (Brazil). Dept. de Materiais Eletricos; Oberacker, R. [Karlsruhe Univ. (Germany)

    2009-07-01

    In this work, the fracture toughness of different ceramics based on Al{sub 2}O{sub 3} and ZrO{sub 2} were evaluated using, comparatively two methods, Vickers indentation and SEVNB (Single Edge V-Notched Beam) method. Al{sub 2}O{sub 3}, ZrO{sub 2}(3%Y{sub 2}O{sub 3}) micro-particled and ZrO{sub 2}(3%Y{sub 2}O{sub 3}) nanometric, ZrO{sub 2}-Al{sub 2}O{sub 3} and Al{sub 2}O{sub 3}-ZrO{sub 2} composites were sintered at different temperatures. Samples were characterized by relative density, X-ray diffraction, SEM, and mechanical evaluation by hardness, bending strength and fracture toughness obtained by ickers indentation and SEVNB-method. The results were presented comparing the densification and microstructural results. Furthermore, the advantages and limitations of each method were discussed. (author)

  17. Evaluation of human dental loss caused by carbamide peroxide bleacher compared with phosphoric acid conditioning - radioactive method; Avaliacao da perda dental humana com o uso do clareador peroxido de carbamida comparado ao condicionamento com acido fosforico - metodo radiometrico

    Energy Technology Data Exchange (ETDEWEB)

    Adachi, Eduardo Makoto; Yousseff, Michel Nicolau [Sao Paulo Univ., SP (Brazil). Faculdade de Odontologia. Dept. de Dentistica; Saiki, Mitiko [Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil). Lab. de Analise por Ativacao Neutronica

    2002-07-01

    The radiometric method was applied to the evaluation of dental loss caused by carbamide peroxide when it is applied on the surface layers of enamel and dentin tissues. Also the dental loss caused by the etching with 37% phosphoric acid procedure used in aesthetic restoration was assessed for comparison with those results obtained. The tooth samples irradiated with a P standard in a thermal neutron flux of the nuclear reactor were placed in contact with 10% carbamide peroxide or with 37% phosphoric acid solution. The radioactivity of {sup 32} P transferred from the radioactive teeth to the bleaching gel or to etching acid was measured using a Geiger Muller detector to calculate the mass of P removed in this treatment and losses were calculated after obtaining their P concentrations. Results obtained indicated that enamel and dentin exposed to carbamide peroxide bleaching agent lose phosphorus. The extent of enamel loss was smaller than that obtained for dentin. In the case of acid etching, there was no difference between the results obtained for enamel and dentin loss. Also the dentin loss obtained after a treatment of 30 applications of 10% carbamide peroxide was the same magnitude of that one application of 37% phosphoric acid. (author)

  18. Cost effective method for valuation of impacts caused by greenhouse gases emissions for oil and gas companies; Metodo de custo-efetividade para avaliacao de impactos causados pelas emissoes de gases de efeito estufa em empresas de oleo e gas

    Energy Technology Data Exchange (ETDEWEB)

    Carneiro, Elisa Vieira [Petroleo Brasileiro S.A. (PETROBRAS), Rio de Janeiro, RJ (Brazil); Barros, Sergio Ricardo da Silveira [Universidade Federal Fluminense (LATEC/UFF), Niteroi, RJ (Brazil). Mestrado em Sistemas de Gestao

    2012-07-01

    The objective of this work is to apply the method of cost-effectiveness in economic evaluation of new investment projects, based on information about reducing greenhouse gases emissions. In the context of the commitment of companies with the Climate Change and Sustainability, this work is important and contributes to the oil and gas industry, because it integrates information on reducing emissions of greenhouse gases in negative Net Present Value (NPV) projects, helping the portfolio manager on decision making between alternative projects. In this article, examples are given of two investment projects, in which the cost effectiveness methodology is applied, considering the reduction of emission of greenhouse gases such as additional environmental benefit, or cost avoidance, in an adjusted model of the economic viability analysis of meritorious projects. (author)

  19. Evaluation of radio-induced DNA damage and their repair in human lymphocytes by comet assay or single cell gel electrophoresis; Avaliacao do dano radioinduzido no DNA e reparo em linfocitos humanos pelo metodo do cometa (single cell gel electrophoresis)

    Energy Technology Data Exchange (ETDEWEB)

    Nascimento, Patricia A. do; Suzuki, Miriam F.; Okazaki, Kayo [Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil)

    1997-12-01

    The comet assay, also called single cell gel electrophoresis technique, permits to evaluate quantitatively DNA breakage induced by chemical and physical agents at the level of the single cell. The present paper refers to the construction of dose-response curves to DNA damage and repair studies in human peripheral lymphocytes, utilizing the comet assay for the radiosensitivity analysis. So, the blood samples were obtained from healthy donors (40-50 year old), irradiated in a {sup 60} Co source (GAMMACEL 220) with doses of 0.17, 0.25, 0.57, 1.10, 2.12 and 4.22 Gy (0.59 Gy/min.) and processed 1 and 24 hours after the exposition. Results obtained showed a increase in the total lenght of comet (DNA migration) as a function of radiation dose in samples processed 1 and 24 hours after the treatment. The DNA lesion in irradiated lymphocytes with 4.22 Gy (means value of 101.4 {mu}m) were 3.4 times higher than in the untreated lymphocytes (mean value of 30 {mu}m) instead of 24 hours after the irradiation were 1.5 times higher (mean value of 46.3 {mu}m). This reduction on DNA repair occurred in these cells. It was also possible visualized the presence of subpopulations of the cells with different sensitivity and repair capacity to ionizing radiation in these donors. (author). 8 refs., 3 figs.

  20. Recovery of the external anticorrosion protection systems of onshore pipelines - evaluation methods and practical results; Recuperacao de sistemas de protecao anticorrosiva externa de dutos terrestres - metodos de avaliacao e resultados praticos

    Energy Technology Data Exchange (ETDEWEB)

    Castinheiras, Wilson; Koebsch, Andre; Silva, Flavio A. da [PETROBRAS S.A., Rio de Janeiro, RJ (Brazil)

    2003-07-01

    The rehabilitation of an old pipeline means to increase its lifetime, making it safety to operate in the necessaries conditions to transport the product. The pipe steel wall evaluation, related to it thickness reduction, due to, basically, internal and external corrosion, is fundamental to guide its rehabilitation. The techniques used to this evaluation are 'pig' and specials field survey. These last surveys are realized over the soil surface (digs is not necessary to access the pipeline or the pipeline operation is not necessary to stop) and objective to verify the pipeline coating and Cathodic Protection System conditions. Due to the actual authors experience, this paper will only treat of the Rehabilitation of the External Anti corrosive Protection System (coating and cathodic protection) of onshore pipelines. This paper present the techniques current attenuation, ON-OFF pipe-to-soil potential close interval survey and DCVG and same practical results obtained with the application of these techniques on the Sergipe/Bahia gas pipeline. (author)

  1. Subsurface microbial ecology. Epi fluorescence direct counts; Ecologia microbica del sottosuolo: metodo di conta diretta in epifluorescenza

    Energy Technology Data Exchange (ETDEWEB)

    Barra Caracciolo, A.; Silvestri, C.; Creo, C.; Izzo, G. [ENEA, Centro Ricerche Casaccia, Rome (Italy). Dipt. Ambiente

    1998-07-01

    To the aim of recognize the importance of microorganisms in affecting or even determining the fate of xenobiotics in the subsurface environment evaluating bacteria concentration in a subsurface ecosystem, the report discusses a soil sample treatment method which has been developed for epi fluorescence direct counting with DAPI. [Italian] Lo studio discute un metodo di trattamento del campione per la conta diretta in epifluorescenza con un marcatore selettivo per il DNA, il DAPI, al fine di quantificare la concentrazione batterica del sottosuolo e studiare il ruolo dei microrganismi nella biodegradazione delle molecole esogene, ancora poco indagato.

  2. A review of calculation methods for fast and intermediate reactors; Expose des methodes pour le calcul de reacteurs a neutrons rapides et intermediaires; Obzor metodov rascheta reaktorov na promezhutochnykh i bystrykh nejtronakh; Estudio panoramico de los metodos de calculo de los reactores rapidos e intermedios

    Energy Technology Data Exchange (ETDEWEB)

    Marchuk, G I [Akademiya Nauk, Moskva, Union of Soviet Socialist Republics (Russian Federation)

    1962-03-15

    de ecuaciones fundamentales y conjugadas de la teoria de los multigrupos. Expone luego diversas aplicaciones de la teoria de la perturbacion a los problemas del calculo fisico del reactor. Examina los metodos numericos de resolucion de las ecuaciones fundamentales y conjugadas que expresan el funcionamiento del reactor sobre la base del metodo de los armonicos esfericos. Explica asimismo como se utiliza el metodo de las caracteristicas en la solucion de problemas relativos a la masa critica del reactor. Describe los metodos de calculo de los reactores con moderadores que contienen hidrogeno y, por fin, expone las bases de un modelo efectivo fundado en la teoria de un solo grupo, aplicable al reactor. (author) [Russian] Obsuzhdaetsya razvitie metodov rascheta yadernykh reaktorov na promezhutochnykh i bystrykh nejtronakh. Rassmatrivayuts ya razlichnye postanovki zadach fizicheskogo rascheta. Obsuzhdaetsya uchet rezonansnykh ehffektov. Vvodyatsya v rassmotrenie mnogogruppovy e sistemy 'osnovnykh i sopryazhennykh uravnenij. Daetsya razlichnoe primenenie teorii vozmushchenij k zadacham fizicheskogo rascheta reaktora. Rassmatrivayuts ya chislennye metody resheniya osnovnykh i sopryazhennykh uravnenij reaktora v priblizhenii metoda sfericheskikh garmonik. Daetsya primenenie metoda kharakteristik k resheniyu zadach na kriticheskuyu massu reaktora. Izlagayutsya metody rascheta reaktorov s vodorodsoderzhashchim i zamedlitelyami . Izlagayutsya osnovy ehffektivnoj odnogruppovoj modeli reaktora. (author)

  3. Seismic pressure effect on retaining walls; Presiones generadas por sismo en muros de retencion

    Energy Technology Data Exchange (ETDEWEB)

    Bonola, Isaac; Aviles, Javier [Instituto Mexicano de Tecnologia del Agua, Jiutepec, Morelos (Mexico)

    2006-04-15

    Retaining walls are auxiliary works used in different hydraulic structures. In seismically active areas, the dynamic pressures generated by the backfill must be appropriately evaluated at the design stage. Currently, a number of methods for estimating the seismic response of this type of works are available; however, most of them are simplified and not all the parameters involved have been examined. In this paper, a hybrid boundary and finite element method is presented for gravity walls in which the backfill can be represented by a horizontally layered medium. The effect of lateral extension of the backfill can be included in the model by introducing a vertical boundary coupling the movement of the backfill with that of the surrounding soil. The wave propagation analysis in the layered medium is carried out for both horizontal and vertical harmonic excitation; the latter excitation may cause important responses under certain situations. To illustrate the applicability of the proposed method, results for two numerical examples are presented: one for dry backfill and other for saturated backfill, considering in both cases the variations of dynamic properties of the soil with the depth. [Spanish] Los muros de retencion son estructuras auxiliares utilizadas en distintas obras hidraulicas. En zonas sismicas, las presiones dinamicas generadas por el relleno deben evaluarse adecuadamente en la etapa de diseno. Actualmente existen numerosos metodos para estimar la respuesta sismica de este tipo de estructuras; sin embargo, la mayoria de ellos son simplificados y no todos los parametros involucrados han sido examinados. En este trabajo se presenta un metodo hibrido de frontera y elemento finito para muros de gravedad en el que el relleno puede representarse por un medio estratificado horizontalmente. En el modelo puede incluirse el efecto de la extension lateral del relleno, introduciendo una frontera vertical que acopla el movimiento del relleno con el del suelo

  4. Wielandt method applied to the diffusion equations discretized by finite element nodal methods; Metodo de Wielandt aplicado a las ecuaciones de difusion discretizadas por metodos nodales de elemento finito

    Energy Technology Data Exchange (ETDEWEB)

    Mugica R, A.; Valle G, E. del [IPN, ESFM, 07738 Mexico D.F. (Mexico)]. e-mail: mugica@esfm.ipn.mx

    2003-07-01

    Nowadays the numerical methods of solution to the diffusion equation by means of algorithms and computer programs result so extensive due to the great number of routines and calculations that should carry out, this rebounds directly in the execution times of this programs, being obtained results in relatively long times. This work shows the application of an acceleration method of the convergence of the classic method of those powers that it reduces notably the number of necessary iterations for to obtain reliable results, what means that the compute times they see reduced in great measure. This method is known in the literature like Wielandt method and it has incorporated to a computer program that is based on the discretization of the neutron diffusion equations in plate geometry and stationary state by polynomial nodal methods. In this work the neutron diffusion equations are described for several energy groups and their discretization by means of those called physical nodal methods, being illustrated in particular the quadratic case. It is described a model problem widely described in the literature which is solved for the physical nodal grade schemes 1, 2, 3 and 4 in three different ways: to) with the classic method of the powers, b) method of the powers with the Wielandt acceleration and c) method of the powers with the Wielandt modified acceleration. The results for the model problem as well as for two additional problems known as benchmark problems are reported. Such acceleration method can also be implemented to problems of different geometry to the proposal in this work, besides being possible to extend their application to problems in 2 or 3 dimensions. (Author)

  5. Ultra-high-speed oscillographic techniques; Techniques d'oscillographie ultra-rapide; Metody sverkhskorostnoj ostsillografii; Metodos oscilograficos ultrarrapidos

    Energy Technology Data Exchange (ETDEWEB)

    Abercrombie, S; Elphick, B; Foster, H [Atomic Weapons Research Establishment, Aldermaston (United Kingdom)

    1962-04-15

    100 {Omega}; e) Des resistances de complement a large bande, destinees a l'extraction des signaux de declenchement de la base de temps; / ) Des bases de temps fournissant des signaux de l'ordre de quelques nanosecondes et comportant des dispositifs de declenchement et de suppression du faisceau; g) Un appareil de prise de vues a grande ouverture. En conclusion, le memoire examine certaines applications de l'electronique nucleaire. (author) [Spanish] Despues de un resumen historico de los metodos de utilizacion de oscilografos para senales transitorias de alta velocidad, los autores examinan sus limites de aplicacion practica. En la memoria se pasa revista a los tubos de rayos catodicos apropiados para estos oscilografos, tomando en cuenta especialmente los tipos de deflexion por onda progresiva. En la memoria se estudian los siguientes componentes de un oscilografo completo para senales transitorias: a) Un tubo de rayos catodicos con deflexion por onda progresiva con conexion coaxial balanceada y una anchura de banda de 2 GHz; b) Un transformador inversor de fase con una impedancia caracteristica de 100 y 50 {Omega} y una anchura de banda de 1,5 kHz a 1,5 GHz; c) Resistencias de terminacion coaxial para frecuencias del orden de los GHz; d) Condensadores de acoplamiento compensados para usarlos en lineas coaxiales con frecuencias comprendidas entre 5 kHz y 3 GHz y 100 {Omega} de impedancia caracteristica; e) Atenuadores resistivos de banda ancha, para la extraccion de senales de disparo de base de tiempos; f) Bases de tiempo del orden de los nanosegundos, con dispositivos disparadores y supresores ; g) Una camara de gran apertura. Finalmente, los autores examinan las aplicaciones de estos oscilografos en la electronica nuclear. (author) [Russian] Posle kratkogo opisaniya ostsillograficheskogo metoda izucheniya sverkhskorostnykh perekhodnykh izluchenij obsuzhdayutsya prakticheskie vozmozhnosti ehtogo apparata. Daetsya obzor podkhodyashchikh katodnykh ehlektronnykh lamp

  6. Application techniques of coatings by thermal projection; Tecnicas de aplicacion de recubrimientos por proyeccion termica

    Energy Technology Data Exchange (ETDEWEB)

    Porcayo Calderon, Jesus [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1995-12-31

    The coatings applied by thermal projection have an important number of applications in different industries (chemical, oil, electric, nuclear, etc.). The main purpose of the protection by means of coatings is to alter the surface characteristics of a component so as to resist corrosive environments, abrasion and erosion, among others. The coatings can be applied by different methods, but due to the fact that its characteristics appreciably differ from the base metal, it is important the knowledge of its properties when a coating is selected for a specific use. In this article the characteristics of the applied coatings by thermal projection, the factors that affect its performance and the principal application techniques, are described. [Espanol] Los recubrimientos aplicados por proyeccion termica tienen un numero importante de aplicaciones en diferentes industrias (quimica, petrolera, electrica, nuclear, etc.). El proposito principal de la proteccion por medio de recubrimientos es alterar las caracteristicas de la superficie de un componente de manera que resista ambientes corrosivos, abrasion y erosion, entre otros. Los recubrimientos pueden aplicarse por diferentes metodos, pero debido a que sus propiedades difieren apreciablemente de las del metal base, es importante el conocimiento de sus propiedades cuando se selecciona un recubrimiento para un uso especifico. En este articulo se describen las caracteristicas de los recubrimientos aplicados por proyeccion termica, los factores que afectan su desempeno y las principales tecnicas de aplicacion.

  7. Application techniques of coatings by thermal projection; Tecnicas de aplicacion de recubrimientos por proyeccion termica

    Energy Technology Data Exchange (ETDEWEB)

    Porcayo Calderon, Jesus [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1996-12-31

    The coatings applied by thermal projection have an important number of applications in different industries (chemical, oil, electric, nuclear, etc.). The main purpose of the protection by means of coatings is to alter the surface characteristics of a component so as to resist corrosive environments, abrasion and erosion, among others. The coatings can be applied by different methods, but due to the fact that its characteristics appreciably differ from the base metal, it is important the knowledge of its properties when a coating is selected for a specific use. In this article the characteristics of the applied coatings by thermal projection, the factors that affect its performance and the principal application techniques, are described. [Espanol] Los recubrimientos aplicados por proyeccion termica tienen un numero importante de aplicaciones en diferentes industrias (quimica, petrolera, electrica, nuclear, etc.). El proposito principal de la proteccion por medio de recubrimientos es alterar las caracteristicas de la superficie de un componente de manera que resista ambientes corrosivos, abrasion y erosion, entre otros. Los recubrimientos pueden aplicarse por diferentes metodos, pero debido a que sus propiedades difieren apreciablemente de las del metal base, es importante el conocimiento de sus propiedades cuando se selecciona un recubrimiento para un uso especifico. En este articulo se describen las caracteristicas de los recubrimientos aplicados por proyeccion termica, los factores que afectan su desempeno y las principales tecnicas de aplicacion.

  8. Survey of Pulsed Neutron Source Methods for Multiplying Media; Methodes des Neutrons Pulses Pour l'Etude des Milieux Multiplicateurs; Obzor metodov s ispol'zovaniem istochnikov impul'snykh nejtronov dlya razmnozhayushchej sredy; Estudio Panoramico de los Metodos de Empleo de Fuentes de Neutrons Pulsados en Medios Multiplicadores

    Energy Technology Data Exchange (ETDEWEB)

    Garelis, E. [General Electric Company, Vallecitos Atomic Laboratory, Pleasanton, CA (United States)

    1965-10-15

    -Small-L ). Il discute en outre l'emploi des methodes qui sont fondees sur la reponse a des impulsions pseudoaleatoires et utilisent une correlation entre l'entree et la sortie, pour la determination de la fonction de Green d'un milieu multiplicateur. H montre que les renseignements obtenus par ces methodes sont identiques a ceux fournis par les methodes de la source puisee a repetition, ce qui permet d'appliquer aux premieres les procedes qui ont ete mis au point pour les secondes. (author) [Spanish] En los ultimos afios ha habido dos tendencias principales acerca de la manera mas eficaz de medir la reactividad de parada, empleando fuentes de neutrones pulsados: la primera preconizaba el empleo de metodos tradicionales de medicion con fuentes neutronicas reiteradamente pulsadas, y la segunda propugnaba la aplicacion de metodos basados en una tecnica seudoaleatoria de respuesta a los impulsos, utilizando una correlacion entre los datos de entrada y los de salida. La informacion obtenida con una y otra tecnica es la misma; en teoria, ambos metodos sirven para determinar la funcion de respuesta. Se resefia el desarrollo de las tecnicas de empleo de fuentes de neutrones pulsados aplicadas a sistemas termicos con miras a medir la reactividad, desde los primeros intentos de Sjoestrand hasta el reciente metodo (k{beta}/ Script-Small-L ). Con el metodo usual de empleo de estas fuentes, la propiedad que se procuia determinar es la funcion de Green del conjunto subercritico empleado, es decir, la respuesta del reactor a una fuente de neutrones de funcion delta. El decrecimiento exponencial (e{sup {alpha}t}) de la funcion de Green proporciona una constante de decrecimiento de los neutrones instantaneos que es independiente del espacio. El autor examina los metodos para obtener el valor de la reactividad partiendo de la medida de a, como por ejemplo el metodo de la medicion de la criticidad por neutrones retardados a y el reciente metodo (k{beta}/ Script-Small-L ). Seguidamente examina el

  9. Sizing an isolated wind-solar-fuel cell generation system based on the particle swarm optimization method; Dimensionamiento de un sistema de generacion aislado eolico-solar-celda de combustible basado en el metodo de optimizacion de enjambre de particulas

    Energy Technology Data Exchange (ETDEWEB)

    Sanchez-Huerta, V; Ramirez-Arredondo, Juan M. [Universidad de Quintana Roo, Chetumal, Quintana Roo (Mexico)]. E-mail: vsanchez@gdl.cinvestav.mx; Arriaga-Hurtado, L. G. [CIDETEQ, Queretaro (Mexico)

    2009-09-15

    Sizing an electric energy system requires an analysis of investment, maintenance and operating costs. In the case of a generation system that uses renewable sources, optimal capacity becomes more complex compared to a conventional system, because of the randomness of renewable resources (wind, solar) and the still high costs of wind and photovoltage generator modules. This work presents the optimal sizing of a wind-solar-fuel cell generation system, minimizing the costs of the system while satisfying the energy demands of an isolated charge. The optimization method used is based on an evolutionary programming technique known as particle swarms (PSO-particle swarm optimization). The generation of energy with a hybrid system is discussed, based on the profile of insolation and wind availability at the site, with the objective of satisfying a specific electric demand. [Spanish] El dimensionamiento de un sistema de generacion de energia electrica requiere un analisis de los costos de inversion, mantenimiento y operacion. En el caso de un sistema de generacion que utiliza fuentes renovables la capacidad optima resulta mas compleja con respecto a un sistema convencional, debido a la aleatoriedad de los recursos renovables (eolico, solar), y a los aun altos costos de generadores eolicos y modulos fotovoltaicos. En este trabajo se presenta el dimensionamiento optimo de un sistema de generacion eolico-solar-celda de combustible minimizando los costos del sistema que satisfaga la energia demandada por una carga aislada. El metodo de optimizacion utilizado esta basado en una tecnica de programacion evolutiva conocida como enjambre de particulas (PSO por sus siglas en ingles: particle swarm optimization). Se plantea la generacion de energia del sistema hibrido con base a la insolacion y el perfil del viento disponible en sitio, con objeto de satisfacer una demanda electrica determinada.

  10. COMPARACIÓN DEL ESTADIO FETAL OBTENIDO POSTMORTEM MEDIANTE DOS METODOS ANTROPOMETRICOS. Comparación del estadio fetal obtenido postmortem mediante dos metodos antropometricos

    Directory of Open Access Journals (Sweden)

    Mirta M Aliendo

    2016-03-01

    Full Text Available En la etapa fetal se observa un rápido incremento de la masa corporal y de todas las dimensiones. La literatura evidencia discrepancias sobre los criterios para determinar el estadio fetal post-mortem, en relación a los parámetros morfométricos utilizados, por lo que nuestro objetivo fue comparar la medición morfológica directa (vertex-coxis, tabla de Hansmann con la ultrasonografía (medición del fémur, para establecer el grado de confiabilidad en la determinación post-mortem del estadío fetal. Se utilizaron 120 fetos: 1 grupo A (60 fetos estadificado ecográficamente y 2 grupo B (60 fetos estadificado por tabla de Hansmann. A ambos grupos se le realizaron múltiples mediciones siguiendo parámetros probados según la literatura internacional. Se utilizó calibre de precisión. Parámetros evaluados: longitud vertex-coxis, circunferencia cefálica, diámetro cefálico occipito-frontal, biparietal, longitud mentón-vertex, perímetro toráxico-transverso, circunferencia abdomi-nal y longitudes de brazo, antebrazo, mano, muslo, pierna y pie. Estos valores fueron agrupados por semanas, obteniéndose la media y aplicándose la prueba t de Student. Los resultados demostraron que la diferencia entre los parámetros medidos en el grupo A y en el grupo B eran significativas en todas las semanas, por lo que se observa disparidad en la determinación del estadio fetal por ecografía y los registros correspondientes a la medición vertex-coxis (tabla de Hansmann postmortem. Concluímos que los resultados obtenidos por ambas modalidades de medición son diferentes para una misma edad gestacional y, por ende, resultaría más apropiado referirse a fetos con ciertas dimensiones según alguno de estos parámetros que a “edad gestacional”.In fetal stage, body mass and measurements quickly increase. Scientific literature shows differences on the criteria to determine the post-mortem fetal stage, depending on morphometric parameters. Our objective

  11. Comparative Study of the Methods Used for the Computer Resolution of Composite Gamma-Ray Spectra; Etude Comparative des Methodes Utilisees pour la Resolution de Spectres Gamma Complexes au Moyen d'un Ordinateur; Sravnitel'noe izuchenie metodov razresheniya sostavnykh gamma-spektrov pri pomoshchi schetno-reshayushchego ustrojstva; Estudio Comparativo de los Metodos Aplicados para Resolver Espectros Gamma Complejos Mediante Calculadoras

    Energy Technology Data Exchange (ETDEWEB)

    DeHaan, A. Jr.; Leventhal, L.; Benson, P. [Tracerlab, Richmond, CA (United States)

    1965-10-15

    'a resolution; 2. Resolution du pic sans elimination; 3. Etablissement d'un ensemble d'equ'ations lineaires simultanees du meme ordre que le nombre de radionucleides presents dans le melange et solution de ces equations; 4. Evaluation des concentrations non connues par la methode des moindres carres, classique ou ponderee; 5. Combinaison des methodes statistiques et des methodes des moindres carres utilisant la regression lineaire multiple progressive, en s'efforcant d'integrer des processus decisifs dans l'analyse. Pour chaque methode d'analyse appliquee a des melanges de radionucleides, les auteurs fournissent une estimation statistique des erreurs de mesure de la concentration des radionucleides. (author) [Spanish] La resolucion de mezclas complejas de emisores gamma se ha simplificado gracias al empleo de espectrometros gamma muy perfeccionados en asociacion con calculadoras numericas. En la actualidad, los laboratorios pueden en general disponer de estos instrumentos o tener facilmente acceso a ellos. En la memoria se examinan los metodos seguidos en el laboratorio de los autores para determinar la concentracion de cada radionuclido emisor gamma contenido en muestras de precipitaciones radiactivas, y se comparan los resultados obtenidos por los diferentes metodos matematicos aplicables a las muestras compuestas. Los datos proporcionados por las calculadoras se comparan con los resultados obtenidos por analisis radioquimico de la muestra. Se han analizado muestras binarias por los metodos mencionados, operacion que se extendio despues a las mezclas integradas por muchos componentes. Se ha elaborado un metodo de computo que normaliza los espectros gamma para reducir al mfnimo el efecto de la deriva del espectrometro a largo plazo, y representa el espectro segun un sistema de coordenadas, una de las cuales es la energia. Se han investigado los efectos de un 'fotopico imprevisto', de una componente de intensidad cero y de picos superpuestos en la resolucion segun los

  12. Celulitis por citomegalovirus

    Directory of Open Access Journals (Sweden)

    A. Ruiz Lascano

    2002-12-01

    Full Text Available Las lesiones cutáneas por citomegalovirus (CMV son infrecuentes y a menudo una manifestación tardía de una enfermedad sistémica, que generalmente anuncia un curso fatal. Comunicamos un caso de celulitis por CMV: una mujer de 70 años con trasplante renal efectuado 1 mes antes de la consulta, terapia inmunosupresora con ciclosporina A y metilprednisona. La paciente ingresó por fiebre, dolor e impotencia funcional en pierna derecha. Comprobamos la existencia de una placa de 8 por 4 cm eritematoedematosa. La tratamos con antibióticos sin mejoría, por lo que realizamos un estudio histopatológico de piel que mostró cambios citopáticos compatibles con infección por CMV. Los cultivos bacteriológicos y micológicos fueron negativos. La inmunohistoquímica específica para CMV y el estudio de reacción en cadena de la polimerasa (PCR de la biopsia de piel fueron positivas, al igual que la antigenemia. El tratamiento con ganciclovir produjo la mejoría del cuadro clínico. En la literatura revisada no hemos encontrado la celulitis como manifestación de enfermedad cutánea por CMV.

  13. Control Methods Used in the Department of Metallurgy for Structure and Fuel Elements; Methodes de Controle Utilisees au Departement de Metallurgie pour les Elements de Structure et les Elements Combustibles; Metody kontrolya struktury toplivnykh ehlementov v departamente metallurgii; Metodos de Control Utilizados en el Departamento de Metalurgia para los Elementos Estructurales y Combustibles

    Energy Technology Data Exchange (ETDEWEB)

    Destribats, Marie-Therese; Allain, C.; Prot, A.; Thome, P. [Centre d' Etudes Nucleaires de Saclay (France)

    1965-09-15

    reactores indujeron a utilizar y a perfeccionar numersos metodos no destructivos destinados a inspeccionar los distintos materiales que intervienen en la construccion de esos reactores; en particular radiografia y gamma- grafia, metodos ultrasonicos y empleo de corrientes de Foucault.. A continuacion se enumeran las operaciones de control llevadas a cabo durante la construccion de reactores pertenecientes a las familias EdF (grafito-gas) y EL 4 (agua pesada), y de elementos colaminados; se hace hincapie en ciertos aspectos caracteristicos de estos metodos, algunos de los cuales son ya bien conocidos. Familia EdF: metodos ultrasonicos para medir el espesor de las paredes de tubos de uranio o aleacion de uranio ; localizacion de las cavidades en esos tubos por gammagraffa; empleo de medios ultrasonicos para control de los tratamientos termicos a que se someten los tubos; empleo de procedimientos ultrasonicos para buscar fallas (inclusiones, grietas) en las palanquillas y barras con que se elaboran las vainas de Mg-Zr; control de la estanqueidad de los elementos mediante exudacion de helio. EL4: uso de metodos ultrasonicos y corrientes de Foucault para medir espesores de pared en tubos de Zircaloy, sean de fuerza o de guia; empleo de metodos ultrasonicos para inspeccionar tubos de fuerza de Zircaloy y vainas de acero inoxidable; radiografia al vacio de vainas de Be; control de la estanqueidad de barras huecas mediante exudacion de helio. Elementos colimados: medida del espesor de vainas mediante el empleo de corrientes de Foucault pulsadas; verificacion de la posicion del alma en tubos y placas mediante radiografia, recuento gamma y aplicacion de corrientes de Foucault pulsadas; control de la homogeneidad del combustible por recuento gamma; deteccion de defectos en barras de Zr-U mediante procedimientos ultrasonicos y gammagraficos; determinacion de las zonas despegadas en placas, empleando metodos ultrasonicos, corrientes de Foucault pulsadas y medicion de resistividad. Estos

  14. Applied methods for mitigation of damage by stress corrosion in BWR type reactors; Metodos aplicados para la mitigacion del dano por corrosion bajo esfuerzo en reactores BWR

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez C, R.; Diaz S, A.; Gachuz M, M.; Arganis J, C. [Instituto Nacional de Investigaciones Nucleares, Gerencia de Ciencia de Materiales, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    1998-07-01

    The Boiling Water nuclear Reactors (BWR) have presented stress corrosion problems, mainly in components and pipes of the primary system, provoking negative impacts in the performance of energy generator plants, as well as the increasing in the radiation exposure to personnel involucred. This problem has caused development of research programs, which are guided to find solution alternatives for the phenomena control. Among results of greater relevance the control for the reactor water chemistry stands out particularly in the impurities concentration and oxidation of radiolysis products; as well as the supervision in the materials selection and the stresses levels reduction. The present work presents the methods which can be applied to diminish the problems of stress corrosion in BWR reactors. (Author)

  15. Trace element determination study in human hair by neutron activation analysis; Estudo da determinacao de elementos traco em cabelos humanos pelo metodo de analise por ativacao com neutrons

    Energy Technology Data Exchange (ETDEWEB)

    Frazao, Selma Violato

    2008-07-01

    Human hair analysis studies have been subject of continuous interest due to the fact that they can be used as an important tool to evaluate trace element levels in the human body. These determinations have been carried out to use hair for environmental and occupational monitoring, to identify intoxication or poisoning by toxic metals, to assess nutritional status, to diagnose and to prevent diseases and in forensic sciences. Although hair analysis presents several advantages over other human tissue or fluid analyses, such as organ tissue, blood, urine and saliva, there are some controversies regarding the use of hair analysis data. These controversies arise from the fact that it is difficult to establish reliable reference values for trace elements in hair. The purpose of this study was to evaluate the factors that affect element concentrations in hair samples from a population considered healthy and residing in the Sao Paulo metropolitan area. The collected human head hair was cut in small pieces, washed, dried and analyzed by neutron activation analysis (NAA). Aliquots of hair samples and synthetic elemental standards were irradiated at the IEA-R1 nuclear research reactor for 16 h under a thermal neutron flux of about 5x10{sup 12} n cm{sup -2} s{sup -1} for As, Br, Ca, Co, Cr, Cs, Cu, Fe, K, La, Na, Sb, Sc, Se and Zn determinations. The induced gamma activities of the standards and samples were measured using a gamma ray spectrometer coupled to an hiperpure Ge detector. For quality control of the results, IAEA- 85 Human Hair and INCT-TL-1 Tea Leaves certified reference materials (CRMs) were analyzed. Results obtained in these CRMs presented for most of elements, good agreement with the values of the certificates (relative errors less than 10%) and good precision (variation coefficients less than 13.6%). Results of replicate hair sample analysis showed good reproducibility indicating homogeneity of the prepared sample. Results obtained in the analyses of dyed and non-dyed hair showed that element adsorption or desorption occurs due to the dye. Analysis of hair samples collected from different regions of the head presented significant differences for the elements Fe, Sc, Se and Cr, indicating the importance of defining head regions for hair sample collection. Results of hair analysis from individuals residing in Sao Paulo metropolitan area showed individual differences for age, gender and natural hair color. Results obtained in this population also showed, that the mean element concentrations found are within the literature values. (author)

  16. Synthesis of barium titanate crystalline nanoparticles using hydrothermal microwave method; Obtencao de nanoparticulas cristalinas de titanato de bario usando metodo hidrotermal assistido por microondas

    Energy Technology Data Exchange (ETDEWEB)

    Souza, A.E.; Silva, R.A.; Teixeira, S.R. [Universidade Estadual Paulista (DFQB/FCT/UNESP), Presidente Prudente, SP (Brazil). Dept. de Fisica, Quimica e Biologia. Lab. de Compositos e Ceramicas Funcionais; Moreira, M.L. [Universidade Federal de Sao Carlos (LiEC/UFSCAR), SP (Brazil). Lab. Interdisciplinar de Eletroquimica e Ceramica; Volanti, D.P.; Longo, E. [Universidade Estadual Paulista (LiEC/UNESP), Araraquara, SP (Brazil). Lab. Interdisciplinar de Eletroquimica e Ceramica

    2009-07-01

    The hydrothermal microwave method (HTMW) was used in the synthesis of barium titanate (BaTiO{sub 3}) nanoparticles. The solution was prepared in deionized water by using titanium (IV) isopropoxide (C{sub 12}H{sub 28}O{sub 4}Ti), barium chloride (BaCl{sub 2}.2H{sub 2}O) and potassium hydroxide (KOH). Afterwards it was heated in an adapted conventional microwave oven. The system is composed of a temperature controller with thermocouple, a hermetic camera of reaction made of teflon, a manometer and a safety valve. The solution was heated to 140 deg C, at a 140 deg C/min heating rate, and maintained at this temperature for 40 minutes. The obtained ceramic powder was characterized by using X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). The XRD data confirms the formation of a high crystalline ceramic material with perovskite structure. The FE-SEM images reveal morphologies with dimensions varying from 27 to 54 nm. (author)

  17. Determination of the biodiesel acidity index by potentiometric titration by using different methods; Determinacao do indice de acidez de biodiesel por titulacao potenciometrica utilizando-se diferentes metodos

    Energy Technology Data Exchange (ETDEWEB)

    Goncalves, Mary Ane; Sobral, Sidney Pereira; Borges, Paulo Paschoal [Instituto Nacional de Metrologia, Normalizacao e Qualidade Industrial (DIMCI/INMETRO), Duque de Caxias, RJ (Brazil). Diretoria de Metrologia Cientifica e Industrial], E-mail: magoncalves@inmetro.gov.br

    2009-07-01

    This work determined the index of the soybean/fat bio diesel through the potentiometric titration. Four different methods were used with variation of solvent and electrodes. The results were compared by F and t (Student) and it was verified that they were agreed in a 95% confidence interval.

  18. Analysis of mercury and selenium in biological samples by neutron activation analysis; Analise de mercurio e selenio em materiais biologicos pelo metodo de analise por ativacao com neutrons

    Energy Technology Data Exchange (ETDEWEB)

    Catharino, Marilia Gabriela Miranda

    2002-07-01

    In the present work, hair samples from populations suspected of contamination by mercury, in the localities of Serra do Navio, Vila Nova and Tartarugalzinho, in the State of Amapa, were analyzed. Hair samples of children under odontopediatric treatment were also analyzed for mercury, in order to study the possibility of transfer of mercury from the dental amalgam and also to obtain data of hair mercury in a control population of children. Another step of the work was the development of a method for the determination of selenium, by using the short-lived radioisotope {sup 77}mSe. After the certification of the method it was applied to the analysis of hair, nails and a vitamin supplement. A comparison was made with the results obtain ed by using the long-lived radioisotope of selenium, {sup 75}Se. The results obtained for mercury in the hair samples of populations living in the State of Amapa have shown that the mercury concentrations in these populations are much higher than in the controls. As for the hair samples of children under treatment with mercury amalgam, no significant differences were found in the concentrations of mercury after the treatment. On the other hand, these data were important to obtain data for a control population of children. The results obtained by using the radioisotope {sup 77}mSe showed that the method developed was suitable for the analyzed matrixes and the results were similar to the ones obtained by employing the usual AANI method, with the radioisotope {sup 75}Se. (author)

  19. Standardization of the method for measurement of plasma estrone by radioimmunoassay; Padronizacao do metodo de dosagem de estrona plasmatica por radioimunoensaio

    Energy Technology Data Exchange (ETDEWEB)

    Vilanova, M.S.V.; Moreira, A.C.; Sala, M.M. de; Sa, M.F.S. de [Sao Paulo Univ., Ribeirao Preto, SP (Brazil). Faculdade de Medicina

    1994-10-01

    The present paper has as objective standardize a radioimmunoassay method for measurement of plasma estrone. Ethyl ether was used for plasma extraction. The sensitivity (Minimal detectable dose) was 3,7 pg/tube; the reproducibility (inter assay error) was 8,6%; the precision (intra assay error) was 4,1%. As a biological control the plasma estrone was ml and in 24 patients with polycystic ovarian syndrome (median = 77,9 pg/ml). (author). 6 refs, 2 figs, 2 tabs.

  20. Sequential method for the assessment of innovations in computer assisted industrial processes; Metodo secuencial para evaluacion de innovaciones en procesos industriales asistido por computadora

    Energy Technology Data Exchange (ETDEWEB)

    Suarez Antola, R [Universidad Catolica del Uruguay, Montevideo (Uruguay); Artucio, G [Ministerio de Industria Energia y Mineria. Direccion Nacional de Tecnologia Nuclear, Montevideo (Uruguay)

    1995-08-01

    A sequential method for the assessment of innovations in industrial processes is proposed, using suitable combinations of mathematical modelling and numerical simulation of dynamics. Some advantages and limitations of the proposed method are discussed. tabs.

  1. Synthesis of lithium silicates generators of tritium by a modified method of combustion; Sintesis de silicatos de litio generadores de tritio por un metodo modificado de combustion

    Energy Technology Data Exchange (ETDEWEB)

    Cruz G, D

    2003-07-01

    The ceramics of lithium have been proposed as generating materials of tritium through the following reaction: {sup 6} Li + {sup 1} n {yields} {sup 4} He + {sup 3} H . In previous works carried out by Pfeiffer and collaborators, the lithium silicates generators of tritium were prepared using the following methods: reactions of solid state, precipitation and sol-gel synthesis. Although those methods have advantages, it is required of heating at high temperatures (900 C during four hours) to be able to obtain the crystalline compounds. Those products found in these works were diverse crystallization forms of the lithium silicates and of SiO{sub 2}, such as, Li{sub 2}SiO{sub 3}, Li{sub 2}Si{sub 2}0{sub 5}, Li{sub 4}SiO{sub 4}, and quartz (SiO{sub 2}). The combustion method uses exothermic reactions to take place ceramic compounds. The precursor solutions are mixtures of the nitrate of metal oxidizer and the fuels (urea, glycine, carbohydrazide). However the reported method in the literature, it is not useful to prepare lithium silicates, for what was modified using non oxidizers compounds. The lithium hydroxide (LiOH) and the silicic acid (H{sub 2}SiO{sub 3}) they were the compounds non oxidizers used, and the urea (CH{sub 4}N{sub 2}O) it was the one fuel. They were carried out two series of experiments; inside the series 1 of experiments are varied the molar ratio of lithium hydroxide and urea (LiOH : H{sub 2}SiO{sub 3} = 1, 2 and 3, LiOH : CH{sub 4}N{sub 2}O = 1, 2, 3, 4 and 5) and the prepared mixtures were taken to one muffle previously preheated to a temperature of 450 C during 5 minutes. In the series 2 of experiments was studied the effect of the temperature and of the washed with distilled water in the prepared samples with the following molar ratios: LiOH : H{sub 2}SiO{sub 3} : CH{sub 4}N{sub 2}O = 1:1:3, 2:1:3, 3:1:3 and 3:1:6, those which were heated to temperatures from 450 C up to 750 C and were washed. The obtained samples were characterized by X-ray diffraction (XRD), Infrared spectroscopy (I S), semiquantitative elemental analysis (EDS) and Thermal gravimetric analysis (TGA). It was found that the molar ratios more adequate of LiOH : H{sub 2}SiO{sub 3} : CH{sub 4}N{sub 2}O to produce Li{sub 2}SiO{sub 3} were: 3:1:3 and 3:1:6. The present carbonates in the powders prepared were eliminated in the second series by heating of the mixture to higher temperatures (650 C), or for washed of the same distilled water. The urea in excess produced coesite (SiO{sub 2}) as main product in the ceramics. Presently work was obtained, in accordance with the results, a sample of lithium silicate (Li{sub 2}SiO{sub 3}) not polluted with any type of compound that it contained coal. (Author)

  2. Sintering kinetics and mass transport in ceramic engobes; Cinetica de sinterizacion y transporte de masa en engobes ceramicos por el metodo Pechini

    Energy Technology Data Exchange (ETDEWEB)

    Dal Bo, M.; Boschi, A. O.; Hotza, D.

    2013-10-01

    This work is concerned to study the sintering rate and mass transport mechanism in ceramic engobes. Specimens of engobes were prepared from a determined formulation by slip casting. Sintering was carried in two steps: (i) at constant heating rate of 7.5 degree centigrade/min and (ii) with an isothermal treatment, during 120 min. According to the dilatometric curves obtained with the engobe sintering during isothermal treatment, the dominant sintering mechanism and the rate of reactions, between the 775 and 975 degree centigrade, were determined. The results showed that between 775 and 800 degree centigrade, the sintering rate can be described by ln[d({Delta}L/L{sub 0})/dt] = -5.64 + 1.77.E10{sup -}3T. At higher temperatures, from 850 to 975 degree centigrade, this rate can be expressed by ln[d({Delta}L/L{sub 0})/ dt] = -30.73 + 3.E10{sup -}2T. The dominant transport mass mechanisms were the grain rearrangement, solution-precipitation and grain boundaries reaction. (Author)

  3. Analysis of the zirconia structure by `ab initio` and Rietveld methods; Analise da estrutura da zirconia por metodos `Ab initio` e de Rietveld

    Energy Technology Data Exchange (ETDEWEB)

    Bechepeche, A.P.; Nasar, R.S.; Longo, E. [Sao Carlos Univ., SP (Brazil). Dept. de Quimica; Treu Junior, O.; Varela, J.A. [UNESP, Araraquara, SP (Brazil). Inst. de Quimica

    1995-12-31

    The zirconia was doped with 0,113 mol of Mg O e 0,005 mol of Ti O{sub 2}, and it was calcined in 1550{sup d}eg C and it was analyzed by XRD. The results shows that pure zirconia contains 96,19% of monoclinic phase and 3,18% of cubic. However, the doping magnesia stabilizes the zirconia in 17,24 of monoclinic; 29,63 of tetragonal and 53,13% of cubic phase. The addition of titanium in zirconia gives 25,85% of tetragonal phase and 37,66% of cubic, and this shows the no stabilizing action of this transition metal. By the other side, the results with ab-initio calculating shows the same tendency resulting in the next values of total energy: pure zirconia - monoclinic -11.316,86ua; tetragonal -8742,09 ua and cubic -8742,80 ua and Zr O{sub 2} Ti O{sub 2} system - monoclinic -9463,02 ua, tetragonal -9459,39 ua and cubic -9459,97 ua (author) 3 figs., 2 tabs.

  4. Methods for fitting of efficiency curves obtained by means of HPGe gamma rays spectrometers; Metodos de ajuste de curvas de eficiencia obtidas por meio de espectrometros de HPGe

    Energy Technology Data Exchange (ETDEWEB)

    Cardoso, Vanderlei

    2002-07-01

    The present work describes a few methodologies developed for fitting efficiency curves obtained by means of a HPGe gamma-ray spectrometer. The interpolated values were determined by simple polynomial fitting and polynomial fitting between the ratio of experimental peak efficiency and total efficiency, calculated by Monte Carlo technique, as a function of gamma-ray energy. Moreover, non-linear fitting has been performed using a segmented polynomial function and applying the Gauss-Marquardt method. For the peak area obtainment different methodologies were developed in order to estimate the background area under the peak. This information was obtained by numerical integration or by using analytical functions associated to the background. One non-calibrated radioactive source has been included in the curve efficiency in order to provide additional calibration points. As a by-product, it was possible to determine the activity of this non-calibrated source. For all fittings developed in the present work the covariance matrix methodology was used, which is an essential procedure in order to give a complete description of the partial uncertainties involved. (author)

  5. Coincidence in the dose estimation in a OEP by different methods; Coincidencia en la estimacion de dosis en un POE por diferentes metodos

    Energy Technology Data Exchange (ETDEWEB)

    Guerrero C, C.; Arceo M, C.; Brena V, M. [ININ, Km. 36.5, Carretera Mexico-Toluca, 52750 La Marquesa, Estado de Mexico (Mexico)]. e-mail: cgc@nuclear.inin.mx

    2007-07-01

    The case of an apparent overexposure to radiation according to that indicated for the thermoluminescent dosemeter 81.59 mSv (TLD) of a occupationally exposed hard-working (POE), for that was practiced the study of biological dosimetry. The estimated dose was 0.12 Gy with which was proven the marked dose registration by the TLD dosemeter. It was concluded that both doses are the same ones. (Author)

  6. Trace element determination in human bones using the neutron activation analysis method; Determinacao de elementos traco em ossos humanos pelo metodo de analise por ativacao com neutrons

    Energy Technology Data Exchange (ETDEWEB)

    Kramarski, Sila; Saiki, Mitiko [Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil); Borelli, Aurelio [Sao Paulo Univ., SP (Brazil). Faculdade de Medicina. Lab. de Nutricao Humana; Batalha, Joao R.F. [Universidade de Mogi das Cruzes, SP (Brazil). Faculdade de Medicina

    1997-10-01

    This work presents the results obtained in the analysis of rib bone samples from normal human individuals by applying instrumental neutron activation analysis. In these analyses, the elements Br, Cl, Fe, K, Mg, Na, Rb, Sr and Zn were found at the ppm level and the elements Ca and P at the level of percentage. The precision and the of the results were evaluated by using biological reference materials NIST SRM 1577a Bovine Liver, IAEA A-11 Milk powder, NIES CRM 9 Sargasso e NIES CRM 10A Rice Flour Unpolished. (author). 5 refs., 3 tabs.

  7. Computer simulating for oil fields with artificial elevation method by electrical submersible pump; Simulacao computacional para pocos de petroleo com metodo de elevacao artificial por bombeio centrifugo submerso

    Energy Technology Data Exchange (ETDEWEB)

    Batista, Evellyne da Silva; Maitelli, Andre Laurindo [Universidade Federal do Rio Grande do Norte (UFRN), Natal, RN (Brazil); Costa, Rutacio de Oliveira [PETROBRAS S.A., Natal, RN (Brazil). Unidade de Negocio RN/CE; Barbosa, Tiago de Souza [Universidade Federal do Rio Grande do Norte (UFRN), Natal, RN (Brazil). Dept. de Engenharia de Computacao

    2008-07-01

    The architecture heterogeneities and petrophysical properties of carbonate reservoirs result from a combination of platform morphology, related depositional environments, relative sea level changes and diagenetic events. The reservoir layering built for static and dynamic modelling purposes should reflect the key heterogeneities (depositional or diagenetic) which govern the fluid flow patterns. The layering needs to be adapted to the goal of the modelling, ranging from full field computations of hydrocarbon volumes, to sector-based fine-scale simulations to test the recovery improvement. This paper illustrates various reservoir layering types, including schemes dominated by depositional architecture, and those more driven by the diagenetic overprint. The examples include carbonate platform reservoirs from different stratigraphic settings (Tertiary, Cretaceous, Jurassic and Permian) and different regions (Europe, Africa and Middle East areas). This review shows how significant stratigraphic surfaces (such as sequence boundaries or maximum flooding) with their associated facies shifts, can be often considered as key markers to constrain the reservoir layering. Conversely, how diagenesis (dolomitization and karst development), resulting in units with particular poroperm characteristics, may significantly overprint the primary reservoir architecture by generating flow units which cross-cut depositional sequences. To demonstrate how diagenetic processes can create reservoir bodies with geometries that cross-cut the depositional fabric, different types of dolomitization and karst development are illustrated. (author)

  8. Optical coherence tomography signal analysis: LIDAR like equation and inverse methods; Analise de sinais de tomografia por coerencia optica: equacao LIDAR e metodos de inversao

    Energy Technology Data Exchange (ETDEWEB)

    Amaral, Marcello Magri

    2012-07-01

    Optical Coherence Tomography (OCT) is based on the media backscattering properties in order to obtain tomographic images. In a similar way, LIDAR (Light Detection and Range) technique uses these properties to determine atmospheric characteristics, specially the signal extinction coefficient. Exploring this similarity allowed the application of signal inversion methods to the OCT images, allowing to construct images based in the extinction coefficient, original result until now. The goal of this work was to study, propose, develop and implement algorithms based on OCT signal inversion methodologies with the aim of determine the extinction coefficient as a function of depth. Three inversion methods were used and implemented in LABView{sup R}: slope, boundary point and optical depth. Associated errors were studied and real samples (homogeneous and stratified) were used for two and three dimension analysis. The extinction coefficient images obtained from the optical depth method were capable to differentiate air from the sample. The images were studied applying PCA and cluster analysis that established the methodology strength in determining the sample's extinction coefficient value. Moreover, the optical depth methodology was applied to study the hypothesis that there is some correlation between signal extinction coefficient and the enamel teeth demineralization during a cariogenic process. By applying this methodology, it was possible to observe the variation of the extinction coefficient as depth function and its correlation with microhardness variation, showing that in deeper layers its values tends to a healthy tooth values, behaving as the same way that the microhardness. (author)

  9. Studies of trace element determinations in nails by neutron activation analysis method; Estudo de elementos traco em unhas pelo metodo de analise por ativacao com neutrons

    Energy Technology Data Exchange (ETDEWEB)

    Aguiar, Amilton Reinaldo; Saiki, Mitiko [Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil)

    1996-07-01

    The purpose of this work was to develop the neutron activation analysis for trace element determinations in nails in order to apply this method to the study of the cystic fibrosis disease. It was verified that the elements Al, As, Br, Ca, Cd, Cl, Co, Cr, Cu, Fe, K, Mg, Mn, Na, Se and Zn can be determined by using short and long irradiations with thermal neutron flux from 10{sup 11} to 10{sup 13} n.cm{sup -2}.{sup -1} at the IEA-R1 nuclear research reactor. The washing solutions of triton-X100, NH{sub 4} OH and acetone were tested in order to eliminate external contaminants from the nail samples. The nail analyses of the individual fingers from both of hands showed that the samples must be collected from all the fingers from both of hands to have a representative sample. The precision and the accuracy of the results were also examined by analyzing NIES 10C Rice Flour, IUPAC Bowen's Kale and NIST 1572 Citrus Leaves reference materials. (author)

  10. Vasoactive intestinal peptide (VIP) labelling with iodine-131 by direct method; Marcacao do peptideo intestinal vasoativo (VIP) com iodo-131 por metodo direto

    Energy Technology Data Exchange (ETDEWEB)

    Colturato, M.T.; Silva, C.P.G. da; Araujo, E.B. [Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil). Centro de Radiofarmacia

    2002-07-01

    The Vasoactive Intestinal Peptide (VIP) is a 28-amino acid polypeptide with a great numbers of receptors in tumoral cells, including adenocarcinomas and pancreatic and colon carcinomas. The VIP molecule contains two tyrosine residues, in positions 10 and 22, that are theoretically equally susceptible to iodination, The VIP was labeled with 131-iodine by direct method using Iodogen as oxidant agent: 15.03 mmol VIP + 0.10 nmol KI + [{sup 131} I]NaI + 13.9 mmol Iodogen; the final volume was adjust to 100 {mu}L using 0.2 M phosphate buffer, pH 7.5 and the reaction proceed with stirring for 30 minutes at room temperature. The radiochemical purity was determined by electrophoresis (Whatman 1MM paper; 0.05 M barbital buffer; pH 8.6; 150 V; 40 minutes) that indicates low percent of free 131-iodine. The high performance liquid chromatography (HPLC) system using RPC{sup 18}, 10 {mu}m, 4 x 250mm column, was able to separate the different radiochemical species, only when an isocratic mixture of acetonitrile: 0.1% trifluoroacetic acid (27:73) was used, with 0.5 mL/min. flux. (author)

  11. Dating of Chichen Itza ceramics by the method of thermoluminescence; Datacion de ceramica de Chichen Itza por el metodo de termoluminiscencia

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez M, P.R.; Mendoza A, D.; Cuapio O, L.A. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico); Ramirez L, A.; Schaaf, P. [Instituto de Geofisica-UNAM, 04510 Mexico D.F. (Mexico); Chung, H. [Dept. of Anthropology, Duksung University, Seoul (Korea, Republic of); FFL-UNAM, 04510 Mexico D.F. (Mexico)

    2005-07-01

    In this work we present some results about thermoluminescent dating of some archaeological ceramic samples belonging to Chichen Itza, Yucatan, Mexico: CH11, CH13, CH14 and CH15. The analysis was realized using the fine grained mode in a Daybreak model 1100 reader Tl System. The radioisotopes that contribute in the accumulate annual dose in ceramic samples ({sup 40} K, {sup 238} U, {sup 232} Th) were determined by means of techniques such as Energy Dispersive X-ray Spectroscopy (EDS) and Neutron Activation Analysis (NAA), while the artificial irradiation of samples was carried out with a {sup 90} Sr source beta radiation. The resulting mean CH11 ceramic sample was 934 {+-}45 years old, CH13 was 465 {+-} 26, CH14 was 888 {+-} 34 and CH15 was 867 {+-} 42. These results are in agreement with results obtained through other methods. (Author)

  12. Determination of the fast neutrons spectra by the Elastic scattering method (n, p); Determinacion del espectro de neutrones rapidos por el metodo de la dispersion elastica (n, p)

    Energy Technology Data Exchange (ETDEWEB)

    Elizalde D, J

    1973-07-01

    This work consists in determining the fast neutron spectra emitted by a Pu-Be isotopic source. The implemented technique is based in the spectrometry (n, p). This consists in making to fall on a fast neutrons beams (polyenergetic) over a thin film of hydrogenated material, detecting the spectra of emitted protons at a fix angle. The polyethylene film and the used solid state detector are inside of a vacuum chamber. The detector is placed at 30 degree with respect to direction of the incident neutrons beam. The protons spectra is stored in a multichannel. the energy is obtained with the prior calibration of the system. The data processing involves the transformation of the protons spectra observed at the falling on neutrons spectra over the film. The energy of the neutrons is related with that of the protons, according to the collision kinematical equations. The cross section of elastic collision of the neutrons with the hydrogen atoms is obtained from literature. Applying these relations to the observed spectra it is obtained the falling on neutron spectra over the film. (Author)

  13. Validation of a method to determine methylmercury in fish tissues using gas chromatography; Validacion de un metodo para determinar metilmercurio en tejido de pescado por cromatografia de gases

    Energy Technology Data Exchange (ETDEWEB)

    Vega Bolannos, Luisa O; Arias Verdes, Jose A; Beltran Llerandi, Gilberto; Castro Diaz, Odalys; Moreno Tellez, Olga L [Instituto de Nutricion e Higiene de los Alimentos, La Habana (Cuba)

    2000-07-01

    We validated a method to determine methylmercury in fish tissues using gas chromatography with an electron capture detector as described by the Association of Official Analytical Chemist (AOAC) International. The linear curve range was 0.02 to 1 g/ml and linear correlation coefficient was 0.9979. A 1 mg/kg methylmercury-contaminated fish sample was analyzed 20 times to determine repeatability of the method. The quantification limit was 0.16 mg/kg and detection limit was 0.06 ppm. Fish samples contaminated with 0.2 to 10 mg/kg methylmercury showed recovery indexes from 94.66 to 108.8%.

  14. ESTUDIO CONFORMACIONAL EN ALGUNAS 1,3-OXAZINAS Y 1,3-BENZOXAZINAS EMPLEANDO METODOS TEORICOS.

    OpenAIRE

    HURTADO OCAMPO, SANDRA MARCELA; HURTADO OCAMPO, SANDRA MARCELA

    2007-01-01

    En la década del cincuenta, resultados experimentales entregados por Urbanski y colaboradores [1] pusieron en evidencia propiedades antituberculósicas y antitumorales en compuestos del tipo 5-nitro-R-N-1 ,3- oxazínicos. Como resultado de un proceso relati 187p.

  15. Electrocardiografo por computadora

    OpenAIRE

    Tinoco Hernandez, Rosanna; Paredes Bejarano, Margarita; Romero Chaglia, Norman; Yapur Auad, Miguel Eduardo

    2009-01-01

    El presente trabajo trata sobrees el diseño y la implementación de un graficador de señales cardiacas por computadora, para lo cual diseñamos un circuito electrónico capaz de recibir la senal analógica proveniente de la actividad electrica del corazón , amplificarla, y luego convertirla en una señal digital para ser procesada por software y finalmente ser graficada, siendo posible así observar la señal cardiaca en el monitor de un computador como un tren de pulsos. Cabe destacar que par...

  16. Indice por Materias

    Directory of Open Access Journals (Sweden)

    Montoya H Luz Marina

    1982-09-01

    Full Text Available Un índice es una lista de palabras o frases indicadores asociados que permite la ubicación de material al interior de un libro o una publicación, en este caso será por el nombre de la materia.

  17. Soil Moisture Measurement through Time Domain Reflectometry (TDR). Irrigation Application; Medicion de la humedad del suelo por reflectometria en el dominio temporal (TDR). Aplicacion en irrigacion

    Energy Technology Data Exchange (ETDEWEB)

    Quinonez Pedroza, Hector E.; Ruelle, Pierre; Nemeth Ildiko [Cemagre, (France)

    2002-03-01

    limitado debido a que estos metodos afrontan seros problemas (elevados costos de los lisimetros y del aspersor de neutrones, asi como se severa reglamentacion y el rango de validez limitado de los tensiometros, etcetera) que dificultan sus generalizacion, ademas, las mediciones de tales metodos generalmente son puntuales y discontinuas. La reflectometria en el dominio temporal (TDR) se presenta como una alternativa viable a tales metodos por su precision y por la continuidad de las mediciones. En el presente trabajo se presenta la evaluacion de la humedad del suelo por el metodo neutronico y TDR en un cultivo de maiz irrigado por gravedad en surcos cerrados. Los resultados muestran que si bien las determinaciones absolutas de la humedad presentan diferencias en los perfiles de 30 a 90 cm, las variaciones de la humedad son similares en todos los casos y responden de manera consecuente con los aportes de agua a la evapotranspiracion. Se pone de manifiesto la limitacion del aspersor de neutrones por la discontinuidad de las mediciones, en contraste con la continuidad de la TDR, que permite el analisis detallado de los fenomenos de infiltracion y evapotranspiracion a escalas instantaneas de tiempo.

  18. Flow measurement in a 170-MW hydraulic turbine using the Gibson method; Medicion del flujo de una turbina hidraulica de 170 MW utilizando el metodo Gibson

    Energy Technology Data Exchange (ETDEWEB)

    Urquiza, Gustavo [Universidad Autonoma del Estado de Morelos (Mexico); Adamkowski, Adam [The Szewalski Institute of Fluid-Flow Machinery (Poland); Kubiak, Janusz; Sierra, Fernando [Universidad Autonoma del Estado de Morelos (Mexico); Janicki, Waldemar [The Szewalski Institute of Fluid-Flow Machinery (Poland); Fernandez, J. Manuel [Comision Federal de Electricidad (Mexico)

    2007-07-15

    This paper describes the methodology applied for measuring water flow through a 170-MW hydraulic turbine. The flow rate was measured using the pressure-time method, also known as the Gibson method. This method uses the well-known water hammer phenomenon in pipelines; in turbine penstocks, for instance. The version of this method used here is based on measuring, during total stop of the water stream, the time-history of pressure change in one section of the turbine penstock and relate it to the pressure in the upper reservoir to which the penstock is connected. The volumetric flow rate is determined from the relevant integration of the measured temporary pressure rise. Flow measurement was possible this way because the influence of the penstock inlet was negligible as far as an error of the measurement is concerned. The length of the penstock was 300 m. Previous experience and a standard IEC-41-1991 were the criteria adopted and applied. A fast and efficient acquisition system, including a 16 bit card, was used. The flow rate was calculated using a computer program developed and tested on several cases. The results obtained with the Gibson method were used for calibration of the on-line flow measuring system based on the Winter-Kennedy method as one of the index methods. This method is very often used for continuous monitoring of the flow rate through hydraulic turbines, when the calibration has been done on site by using the results of measurements obtained by the absolute method. Having measured the flow rate and output power, the efficiency was calculated for any operating conditions. A curve showing the best operating conditions based on the highest efficiency is presented and discussed. The details of the instrumentation, its installation, and the results obtained are discussed in the paper. [Spanish] Este articulo describe la metodologia aplicada para la medicion del flujo en una turbina hidraulica de 170 MW. El flujo se midio utilizando el metodo de presion

  19. A Comparison of Radioisotope Methods for River Flow Measurement; Comparaison de methodes radioisotopiques de mesure du debit des cours d'eau; Sravnenie radioizotopnykh metodov izmereniya rechnykh stokov; Comparacion de los metodos radioisotopicos para medir el caudal de los rios

    Energy Technology Data Exchange (ETDEWEB)

    Clayton, C. G.; Smith, D. B. [Wantage Research Laboratory Atomic Energy Research Establishment Wantage, Berks (United Kingdom)

    1963-08-15

    consequent d'aucune utilite comme indicateur dans la mesure du debit d'un cours d'eau s'il n'est pas employe avec un entraineur; mais avec un entraineur, on observe une amelioration marquee de l'exactitude des resultats. {sup 24}Na et {sup 82}Br n'ont accuse aucune adsorption a des distances bien superieures a celles qui sont necessaires pour assurer une brassage lateral; dans la riviere la plus lente, toutefois, on a note, a plus de 660 m du point d'injection, une certaine diminution de {sup 24}Na. Le memoire contient quelques observations sur la dispersion laterale et longitudinale qui, a une certain degre, influe sur l'application generale des methodes radioisotopiques a la mesure du debit des cours d'eau. Les auteurs parviennent a la conclusion que les trois methodes donnent des resultats satisfaisants. Ils preferent, en fin'de compte, la methode d'echantillonnage continue, car elle donne les resultats les plus exacts pour, la quantite minimum d'indicateur. (author) [Spanish] Los autores han empleado los procedimientos de dilucion, muestreo continuo y recuento total en un estudio comparativo de los metodos radioisotopicos de medicion de caudales fluviales en el arroyo Aylburton, en Gloucestershire, y en los rios Usway Burn y Alwin, en Northumberland. Se trata de tres tios de caracteristicas geologicas diferentes, cuyos caudales oscilan entre 2,5 1/s y 3 m{sup 3}/s. En todos los metodos de medicion de caudales que emplean indicadores, la distancia entre el punto en que se efectua la medicion y el punto en que se anade el indicador tiene que ser suficientemente grande para que se produzca una mezcla lateral completa. Por otra parte, no debe ser excesiva para evitar que la dipersion longitudinal supere cierto valor o que se pierda parte del indicador por adsorcion en el lecho fluvial. La dispersion depende de las caracteristicas hidraulicad de la corriente y es inherente al metodo. Por su parte, la adsorcion depende del indicador elegido y de las caracteristicas geologicas

  20. Flow in potential cascades by means of the finite element method; Flujo en cascadas potenciales mediante el metodo del elemento finito

    Energy Technology Data Exchange (ETDEWEB)

    Sosa Cordero, Rodolfo; Fernandez Valencia, Gonzalo [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1987-12-31

    This article presents a mathematical model and its solution by means of the finite element method with approximate Garlekin formulation, for the flow analysis in a circular cascade, in a surface of revolution current of a turbo- machine, that can be axial, mixed or radial. To the revolution surface an agreed transformation is applied to obtain a plane, eliminating in this form one term in the equation succeeding in avoiding an iterative solution. Likewise, the finite element method allows to solve the equation in partial derivatives of the elliptical type in its quasi-harmonic form. Additionally, the method followed to introduce the contour conditions is presented; specially, the Kutta-Joukowsky conditions and the one of periodicity, which distinguishes this problem from the classical problems of ideal flows evaluated in the contour. [Espanol] En este articulo se presenta un modelo matematico y su solucion mediante el empleo del metodo del elemento finito con formulacion aproximada de Galerkin, para el analisis del flujo en una cascada circular, en una superficie de corriente de revolucion de una turbomaquina, que puede ser axial, mixta o radial. A la superficie de revolucion se le aplica una transformacion conforme para obtener un plano, eliminando de esta forma un termino en la ecuacion logrando evitar la solucion iterativa. Asimismo, el metodo del elemento finito permite resolver la ecuacion en derivadas parciales del tipo eliptico en su forma cuasiarmonica. Se presenta, ademas, el metodo seguido para introducir las condiciones de contorno; en especial, las condiciones de Kutta-Joukowsky y la de periodicidad, que distinguen a este problema de los problemas clasicos de flujos ideales valuados en el contorno.

  1. Flow in potential cascades by means of the finite element method; Flujo en cascadas potenciales mediante el metodo del elemento finito

    Energy Technology Data Exchange (ETDEWEB)

    Sosa Cordero, Rodolfo; Fernandez Valencia, Gonzalo [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1986-12-31

    This article presents a mathematical model and its solution by means of the finite element method with approximate Garlekin formulation, for the flow analysis in a circular cascade, in a surface of revolution current of a turbo- machine, that can be axial, mixed or radial. To the revolution surface an agreed transformation is applied to obtain a plane, eliminating in this form one term in the equation succeeding in avoiding an iterative solution. Likewise, the finite element method allows to solve the equation in partial derivatives of the elliptical type in its quasi-harmonic form. Additionally, the method followed to introduce the contour conditions is presented; specially, the Kutta-Joukowsky conditions and the one of periodicity, which distinguishes this problem from the classical problems of ideal flows evaluated in the contour. [Espanol] En este articulo se presenta un modelo matematico y su solucion mediante el empleo del metodo del elemento finito con formulacion aproximada de Galerkin, para el analisis del flujo en una cascada circular, en una superficie de corriente de revolucion de una turbomaquina, que puede ser axial, mixta o radial. A la superficie de revolucion se le aplica una transformacion conforme para obtener un plano, eliminando de esta forma un termino en la ecuacion logrando evitar la solucion iterativa. Asimismo, el metodo del elemento finito permite resolver la ecuacion en derivadas parciales del tipo eliptico en su forma cuasiarmonica. Se presenta, ademas, el metodo seguido para introducir las condiciones de contorno; en especial, las condiciones de Kutta-Joukowsky y la de periodicidad, que distinguen a este problema de los problemas clasicos de flujos ideales valuados en el contorno.

  2. Apendicitis por Paracoccidioides brasiliensis

    Directory of Open Access Journals (Sweden)

    Ana Beatriz MUÑOZ URRIBARRI

    2006-01-01

    Full Text Available La paracoccidioidomicosis es la micosis más prevalente en Sudamérica. La forma aguda afecta el sistema fagocítico mononuclear de niños y personas inmunocomprometidas. El compromiso gastrointestinal es frecuente y su patogenia implica diseminación hematógena y linfática. La linfadenomegalia abdominal causa obstrucción intestinal y abdomen agudo. En este artículo damos a conocer el caso de un niño con compromiso gastrointestinal por apendicitis. Este es el primer caso reportado de apendicitis por esta patología. (Rev Med Hered 2006;17:58-60.

  3. METODO PROPUESTO PARA LA PREDICCION DE TENSIONES ADMISIBLES EN ZAPATAS CIMENTALDAS EN ARENAS

    OpenAIRE

    DIAZ SEGURA; EDGAR GIOVANNY; DIAZ SEGURA; EDGAR GIOVANNY

    2010-01-01

    La evidencia experimental ha demostrado que la mayoría de las metodologías actuales no son capaces de predecir las cargas de diseño de zapatas en suelos no cohesivos con un grado aceptable de precisión. En el presente estudio se propone un método sencillo y realista para estimar la carga de diseño de zapatas rígidas cimentadas en arenas sometidas a una carga estática vertical. Se adoptó como criterio de diseño el propuesto por Terzaghi et al. (1996), basado en limitar a 16 mm e...

  4. METODO PROPUESTO PARA LA PREDICCION DE TENSIONES ADMISIBLES EN ZAPATAS CIMENTADAS EN ARENAS

    OpenAIRE

    DIAZ SEGURA, EDGAR GIOVANNY; DIAZ SEGURA, EDGAR GIOVANNY

    2010-01-01

    La evidencia experimental ha demostrado que la mayoría de las metodologías actuales no son capaces de predecir las cargas de diseño de zapatas en suelos no cohesivos con un grado aceptable de precisión. En el presente estudio se propone un método sencillo y realista para estimar la carga de diseño de zapatas rígidas cimentadas en arenas sometidas a una carga estática vertical. Se adoptó como criterio de diseño el propuesto por Terzaghi et al. (1996), basado en limitar a 16 mm el asentamiento ...

  5. Evaluation of peach palm (Bactris gasipaes Kunth) processed by radiation; Avaliacao do palmito pupunha (Bactris gasipaes Kunth) processado por radiacao ionizante

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Priscila Vieira da

    2009-07-01

    The peach palm can be obtained from several species of palms, but the peach palm has attracted great interest by producers, as has characteristics of precocity, rusticity and tillering, producing a palm-quality differentiating it from other palmettos for their sweet flavor and yellowish . The food irradiation has been used as a treatment to ensure microbiological food safety of products to avoid infection. Its use combined with minimal processing could increase the safety and quality of minimally processed vegetables. We aimed at evaluating the effect of gamma radiation and electron beams to control bacteria; assess the physical characteristics through analysis of color and texture in peach palm in natura minimally processed and subjected to ionizing radiation stored at 8 deg C as well as evaluating the sensory characteristics. The results in the microbiological analysis showed that ionizing radiation promotes reduction of microbial load in both treatments. In the analysis of color we can conclude that among all the treatments the sample irradiated with 1.5 kGy showed more differences when compared with the other samples. Observing texture characteristics we could conclude that irradiation changed the texture of the palm, unlike the treatment by electron beams that showed no difference between samples. For the sensory analysis, the gamma radiation with dose of 1.5 kGy, induced changes in sensory properties to the attributes and overall appearance. The dose of 1 kGy caused no significant difference, so a recommended dose for the irradiation of the studied product. (author)

  6. Experimental dosimetric evaluation of inhomogeneity effects caused by thoracic vertebrae; Avaliacao dosimetrica experimental de efeitos de inomogeneidade causados por vertebras toracicas

    Energy Technology Data Exchange (ETDEWEB)

    Castro, Andre L.S.; Thompson, Larissa; Campos, Tarcisio P.R., E-mail: radioterapia.andre@gmail.com [Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG (Brazil). Departamento de Engenharia Nuclear; Instituto de Radioterapia Sao Francisco, Belo Horizonte, MG (Brazil); Centro de Tratamento em Radioterapia, Betim, MG (Brazil)

    2017-11-01

    The presence of tissue inhomogeneities alters the absorbed dose distribution, which magnitude depends on the physical properties of these tissues and the quality of the radiation. Incorrect assessment of dose distribution may affect local tumor control or increase the normal tissue complication probabilities. The aim of this study was to investigate the influence of the thoracic vertebrae inhomogeneous effects on the dose absorbed by the surrounding soft tissue. The values predicted by the treatment planning system (TPS) were compared to the experimental measurements with EBT-2 radiochromic films positioned on a simulator consisting of only water and inserted axially into a thoracic phantom made of synthetic bone and water. There was a significant change in the dose distribution pattern, increased absorbed dose at the bone-soft tissue interface and high point doses adjacent to the bone compared to the results obtained for the films in homogeneous medium and TPS. The experimental measurements in the water agreed with the TPS within 1.0% with respect to the modal dose whereas the biggest difference found for the medium containing the vertebrae was of 4.6%, however, both values are within the experimental uncertainty. (author)

  7. Magnetic resonance imaging pre- and postoperative evaluation of tetralogy of Fallot; Avaliacao pre e pos-operatoria da tetralogia de Fallot por ressonancia magnetica

    Energy Technology Data Exchange (ETDEWEB)

    Bernardes, Renata Junqueira Moll; Simoes, Luiz Carlos [Instituto Nacional de Cardiologia (INC), Rio de Janeiro, RJ (Brazil). Servico de Cardiologia da Crianca e do Adolescente; Marchiori, Edson [Universidade Federal Fluminense, Niteroi, RJ (Brazil). Faculdade de Medicina. Dept. de Radiologia]. E-mail: edmarchiori@bol.com.br; Bernardes, Paulo Manuel de Barros; Gonzaga, Maria Beatriz Albano Monzo [Rede Labs/D' Or, Rio de Janeiro, RJ (Brazil)

    2004-08-01

    The purpose of this study was to assess the usefulness of magnetic resonance imaging (MRI) in the pre- and postoperative evaluation of patients with tetralogy of Fallot. Twenty patients aged 1 to 29 years were prospectively evaluated with black-blood and contrast-enhanced angiographic techniques, 11 with the classic form of tetralogy of Fallot and 9 with tetralogy of Fallot and pulmonary atresia. MRI studies provided adequate visualization of the aorta that was classified as dilated or not dilated, and definition of its position in all cases. The use of contrast-enhanced MR angiographic techniques provided excellent imaging of the main right and left pulmonary arteries. The results suggest that MRI, including contrast-enhanced angiography techniques, is a useful tool in the evaluation of patients with tetralogy of Fallot before and after cardiac surgery since it provides important anatomical information that is not always obtained with echocardiography. MRI can be considered an alternative to cardiac catheterization, particularly in the evaluation of the pulmonary vascular anatomy. (author)

  8. Assessing the quality of energy supplied by small renewable energy systems; Avaliacao da qualidade da energia fornecida por sistemas renovaveis isolados de pequeno porte

    Energy Technology Data Exchange (ETDEWEB)

    Galhardo, Marcos Andre Barros; Pinho, Joao Tavares [Universidade Federal do Para (UFPA), Belem, PA (Brazil). Grupo de Estudos e Desenvolvimento de Alternativas Energeticas], e-mail: galhardo@ufpa.br, E-mail: jtpinho@ufpa.br

    2004-07-01

    This paper makes an analysis of the power quality supplied by small renewable energy systems with energy storage in a battery bank and its DC/AC conversion by an inverter. It is shown that the power quality supplied by stand-alone renewable systems depends on the used inverter, specially of its voltage waveform, the load supplied and the voltage level in the battery bank, which has a direct influence on the value of the rms output voltage of the inverter. For these analysis, measurements are presented for typical loads used in these systems as illumination, TV, refrigerator, etc., and combinations of these loads, supplied by different waveforms. (author)

  9. Properties of altered soils by alkaline solution: contribution in the performance evaluation of repositories; Propriedades de solos alterados por solucao alcalina: contribuicao na avaliacao de desempenho de repositorios

    Energy Technology Data Exchange (ETDEWEB)

    Calabria, Jaqueline Alves de Almeida

    2015-07-01

    The radioactive wastes from nuclear technology applications must be properly disposed in a repository, during the necessary time to ensure the human and the environment protection. The surface systems are largely considered for disposal of low and intermediate level radioactive waste, but generally require the use of engineering barriers to control the radionuclides release. An important engineering barrier is the backfill which is situated between the package and structural material, and has the functions of reducing the water infiltration and to promote the retardation of the radionuclide migration, among others. Therefore, the material to be used as backfill such as clays, cement, soils, rocks, must has good sorption, permeability and mechanical properties. The selection of the material will depend also largely on the material availability and installation design. The concrete is also used in the construction of repository, and its interaction with water induces its degradation, resulting in a high pH solution. This solution interacts with the backfilling materials promoting mineralogical alterations that results in significant changes in their key properties and performance as safety component of the repository. In this work, five Brazilian soils of Minas Gerais state, selected according to their generic characteristics along with information from Sistema Brasileiro de Classificacao de Solos (SiBCS) were investigated concerning their potential use as backfilling material in a superficial repository by the determination of retention capacity for cesium and iodine. Sorption-related parameters, used in the performance assessment of the soils, were obtained from experimental data fitting to different sorption isotherms models. The soil that showed the best sorption of Cs, was a clay soil that presented distribution coefficient (K{sub d}) of 90.5 mL.g{sup -1} and maximum sorption capacity (Q{sub max}) of 18.372 mg.g{sup -1}. Regarding the iodine, the sorption was very low for all evaluated samples (less than 20% after 10 days of equilibrium), being the best performance one, the nitosoil sample whose K{sub d} values varied from 11.78 to 63.05 mL.g{sup -1}. In a subsequent step, the clay soil, was submitted to the alkaline solution interaction, in order to investigate possible alterations on the sorption properties and hydraulic conductivity of this soil. Using the sorption parameters, obtained from data fitted isotherms, the retardation factor, R, was estimated for the samples before and after the interaction. It was demonstrated that the alkaline alteration promotes damages to sorption properties of Cs, once the R became significantly smaller (about 1000 times) after the interaction. The hydraulic conductivity in turn increased slightly (3,91x10{sup -8} cm.s{sup -1} to 5,08 x 10{sup -8} cm.s{sup -1}). It was concluded that these changes were due, mainly, to the dissolution of minerals present in the clay soil (kaolinite and quartz), associated with the incorporation of K and Ca from the alkaline solution, resulting, probably, in the formation of hydrated calcium silicate phases. Additionally, the effects of alkaline solution on the properties of a commercial bentonite were studied. Contrary to the clay soil, it was observed a gain in the sorption characteristics, with K{sub d} (Cs) increasing from 760.05 mL.g{sup -1}to 1311.80 mL.g{sup -1}and Q{sub max} from 36.32 mg.g{sup -1}to 52.13 mg.g{sup -1}, with the corresponding increase in the retardation coefficient, R. The dissolution of the clay minerals from the initial sample and the incorporation of Mg, K e Ca coming from the alkaline solution, generating smectite of different kinds, were considered as the main mineralogical changes responsible for the modifications in sorption parameters. The different behavior between the two evaluated samples, soil and bentonite, confirms that the nature and extension of changes observed, when mineral samples interact with alkaline solution, depend on the chemical/mineralogical composition of the solid material, among other factors. (author)

  10. Assessment in dogs tympanic bulla, through virtual tomographic endoscopy; Avaliacao de bulas timpanicas em caes, por meio da endoscopia tomografica virtual

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Luciana Carandina da; Sabino, Emanuelle Guidugli, E-mail: lucianacarandina@uol.com.br [Universidade Estadual Paulista Julio de Mesquita Filho (UNESP), Botucatu, SP (Brazil). Faculdade de Medicina Veterinaria. Dept. de Reproducao Animal e Radiologia Veterinaria; Vulcano, Luiz Carlos; Machado, Vania Maria de Vasconcelos [Universidade Estadual Paulista Julio de Mesquita Filho (UNESP), Botucatu, SP (Brazil). Faculdade de Medicina Veterinaria

    2012-07-01

    Dogs usually have problems related to the auditory canal. For the diagnosis of these pathologies, it is necessary a physical examination and, in some cases radiographic examination and computed tomography. The tympanic bulla is not easily visualized radiographically, since there is many structures of the brain overlaying the image obtained. The computed tomography has been the technique of choice to assess this structure faithfully. A new alternative assessment of the tympanic bulla is tomographic virtual endoscopy, which allows an improvement of the image obtained through the virtual tomographic technique. This paper provides information on the use of computed tomography, and a new technique, tomographic virtual endoscopy, in order to make the improvement of these techniques, and prove the reliability of these changes in the diagnosis of ear canals of dogs. Therefore, we performed the computed tomography of the tympanic bulla on healthy animals, and later performed image reconstruction in three-dimensional (3D) mode for virtual endoscopy. (author)

  11. Ultrasound stress measurements for API X65 pipes; Avaliacao por ultra-som das tensoes impostas em tubo API X-65

    Energy Technology Data Exchange (ETDEWEB)

    Medeiros, Raimundo C.; Santos, Ramon Loback Medeiros [TRANSPETRO - PETROBRAS Transporte S.A., Rio de Janeiro, RJ (Brazil); Bittencourt, Marcelo S.Q.; Lamy, Carlos A. [Instituto de Engenharia Nuclear (IEN), Rio de Janeiro, RJ (Brazil); Donato, Guilherme V.P. [PETROBRAS S.A., Rio de Janeiro, RJ (Brazil)

    2003-07-01

    Risks of damages or even premature collapse of buried pipelines caused by their interaction with geologically unstable soils are well-established phenomena. Therefore, both monitoring and measurements of the actual loads transmitted by the soil to the pipeline are mandatory requirements, and define the necessity of developing new nondestructive techniques capable to carry out through evaluations of these loads in field. The aim of this paper has been placed on the presentation of a cutting-edge ultrasonic technology applied to stress measurements. To accomplish this purpose a series of ultrasonic tests were conducted on tensile specimens extracted from API 5L Grade X-65 steel pipe to determine its acoustic birefringence. The results have evidenced the acoustic birefringence to be a technique sufficiently consistent and, consequently, it shall be considered as a promising tool for the evaluation of the structural integrity of metallic structures in the near future. In addition, it was also observed that the use of this technique allows measuring the residual stress resulting from the pipe manufacturing process. (author)

  12. Radiographic and tomographic study of the elbow joint in dogs; Avaliacao morfologica e morfometrica da articulacao umerorradioulnar em caes atraves de exames radiograficos e por tomografia computadorizada

    Energy Technology Data Exchange (ETDEWEB)

    Sendyk-Grunkraut, Alessandra; Martin, Claudia M.; Souza, Alexandre N.A.; Patricio, Geni Cristina F.; Lorigados, Carla A.B.; Matera, Julia M.; Fonseca-Pinto, Ana C.B.C., E-mail: anacarol@usp.br [Universidade de Sao Paulo (FMVZ/USP), SP (Brazil). Faculdade de Medicina Veterinaria e Zootecnia

    2017-02-15

    Elbow dysplasia disease includes an united anconeal process, fragmented medial coronoid process, osteochondrosis of humeral trochlea, articular incongruity and degenerative joint disease. The aim of this study was to present detailed morphologic and morphometric aspects of the elbow joint in dog in clinical and correlate with radiographic and tomographic (CT) exam. Inter-observer variation for articular incongruity measurements by CT, comparative analysis in the radiographic exam, angle in ulnar notch and its comparative analysis between radiographic and tomographic agreement examination in 44 elbow of dogs with different ages were evaluated. The statistics analyses included the kappa coefficient and interclass correlation and Fischer's test and McNemar's test. It was evidenced that individual performance of each radiographic incidence had poor agreement with the tomographic exam, suggesting that the accomplishment of more than two radiograph views are needed. There was no agreement between the three evaluators in the ulnar notch angle at radiographic and tomographic exams. However, there was good/moderate agreement for articular incongruity measurement in the sagittal plane between evaluators. It was possible to conclude that none of the five radiographic incidences was better than the others for radiographic analysis because each incidence had a better identification of a particular elbow compartment; measurements at the tomographic exam to evaluate radioulnar incongruity had no reproductiveness in the frontal plane, but in sagittal plan had a good/moderate agreement between observers and the angle in ulnar notch presented no repeatability at radiographic exam and no reproductiveness at tomographic exam. (author)

  13. Evaluation of thermoplastic starch/MMT nanocomposites by nuclear magnetic resonance (NMR); Avaliacao de nanocompositos de amido termoplastico e argila por RMN

    Energy Technology Data Exchange (ETDEWEB)

    Schlemmer, D.; Rodrigues, Tiago C.A.F.; Resck, I.S.; Sales, M.J.A., E-mail: danielas@unb.b [Universidade de Brasilia (LabPol/UnB), DF (Brazil). Inst. de Quimica. Lab. de Pesquisa em Polimeros

    2010-07-01

    Starch has been studied for replace petrochemical plastics for short shelf life. However, the starch films have limitations: sensitivity to moisture and poor mechanical strength. This can be improved by incorporating loads such as montmorillonite, forming nanocomposites. Nanocomposites were prepared with 1, 3, 5 and 10% of montmorillonite, using vegetable oils of Brazilian Cerrado as plasticizers. The NMR spectra of oils are similar, but the intensities of the signals varying with the proportion of fatty acids. The molar mass of the oils was also calculated by NMR. The spectrum of CP/MAS {sup 13}C NMR for starch presented a duplet in 97 and 98 ppm, on the amorphous domains of C-1, indicating a crystal type A. The spectra of the nanocomposites are similar to those of starch and oils. No new peaks appear, suggesting that there are no strong chemical bonds between components. (author)

  14. 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)

  15. Imaging of acquired non-traumatic cochlear lesions: iconographic essay; Avaliacao por imagem das lesoes cocleares adquiridas (nao-traumaticas): ensaio iconografico

    Energy Technology Data Exchange (ETDEWEB)

    Garcia, Marcelo de Mattos; Gonzaga, Juliana Gontijo [Clinica Axial - Centro de Imagem, Belo Horizonte, MG (Brazil)]. E-mail: cidbh@cidbh.com.br; marcelogarcia@superig.com.br

    2006-04-15

    Different non-traumatic acquired cochlear lesions are shown in this article with imaging methods. They may be responsible for neuro sensorial hearing loss or vertigo. The method of choice is computed tomography when evaluating the osseous labyrinth whereas magnetic resonance imaging has superior resolution in the studies of the membranaceous labyrinth. (author)

  16. Evaluation of maximum absorbed dose for accompanying patients in nuclear medicine establishments; Avaliacao da dose maxima absorvida por acompanhantes de pacientes em servicos de medicina nuclear

    Energy Technology Data Exchange (ETDEWEB)

    Cabral, Geovanna; Amaral, Ademir; Hazin, Clivis A. [Pernambuco Univ., Recife, PE (Brazil). Dept. de Energia Nuclear; Lima, Ricardo A.; Nogueira, Maria S. [Centro Regional de Ciencias Nucleares (CRCN), Recife, PE (Brazil); Lopes, Ferdinand [Centro de Medicina Nuclear de Pernambuco (CEMUPE), Recife, PE (Brazil); Guimaraes, Maria Ines C.C. [Sao Paulo Univ., SP (Brazil). Centro de Medicina Nuclear

    2001-07-01

    In nuclear medicine, radioisotopes are bound to various pharmaceuticals for use in diagnostic and therapeutic applications. These unsealed sources are administered in various forms to patients, who remain radioactive for hours or days, and represent a source of potential radiation exposure for others. Thus, in nuclear medicine departments, radiation protection of workers and members of the public (especially persons accompanying patients) must consider this exposure. In this study, thermoluminescent dosimeters were given to various persons who were accompanying patients in two nuclear medicine departments in Recife, Pernambuco State, Brazil. Exposure results are given, and issues regarding exposure conditions and times for members of the public in these departments are discussed. (author)

  17. Magnetic resonance imaging textural evaluation of posterior cranial fossa tumors in childhood; Avaliacao textural por ressonancia magnetica dos tumores da fossa posterior em criancas

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Joelson Alves dos; Costa, Maria Olivia Rodrigues da; Otaduy, Maria Concepcion Garcia; Lacerda, Maria Teresa Carvalho de; Leite, Claudia da Costa [Sao Paulo Univ., SP (Brazil). Faculdade de Medicina. Dept. de Radiologia]. E-mail: joelson_alves@ig.com.br; Matsushita, Hamilton [Sao Paulo Univ., SP (Brazil). Faculdade de Medicina. Dept. de Neurologia

    2004-08-01

    Objective: To distinguish healthy from pathological tissues in pediatric patients with posterior cranial fossa tumors using calculated textural parameters from magnetic resonance images. Materials And Methods: We evaluated 14 pediatric patients with posterior cranial fossa tumors using the software MaZda to define the texture parameters in selected regions of interest representing healthy and pathological tissues based on T2-weighted magnetic resonance images. Results: There was a statistically significant difference between normal and tumoral tissues as well as between supposedly normal tissues adjacent and distant from the tumoral lesion. Conclusion: Magnetic resonance textural evaluation is an useful tool for determining differences among various tissues, including tissues that appear apparently normal on visual analysis. (author)

  18. Evaluation of poly(vinylpyrrolidone) and collagen by Low Field Nuclear Magnetic Resonance Spectroscopy; Avaliacao da polivinilpirrolidona e do colageno por ressonancia magnetica nuclear de baixo campo

    Energy Technology Data Exchange (ETDEWEB)

    Costa, Paula de M.; Tavares, Maria I.B. [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil). Inst. de Macromoleculas Professora Eloisa Mano]. E-mail: pmcosta@ima.ufrj.br

    2005-07-01

    Blends of natural and synthetic polymers represent a new class of materials with better mechanical properties and biocompatibility than those of the single components. Collagen and poly(vinylpyrrolidone) are well known for their important biological properties. The blending of collagen with poly(vinylpyrrolidone) makes it possible to obtain new materials in which strong interactions between the synthetic and biological components occur. Do to the excellent biocompatibility of these polymers, this blend has been much studied intending biomedical applications. And a one technique that can provide important information on molecular mobility, compatibility and even evaluate the interactions that can occur with these polymers is the Low Field Nuclear Magnetic Resonance Spectroscopy. Thus, the purpose of this work is to evaluate collagen and poly(vinylpyrrolidone) by Low Field Nuclear Magnetic Resonance Spectroscopy. From the values of relaxation times obtained, we can conclude that these materials have different interactions, and different mobility domains, confirming the heterogeneity and complexity of these materials. (author)

  19. Chemical and microbiological assessments of the multi mixture treated by gamma radiation; Avaliacao quimica e microbiologica da multimistura tratada por irradiacao gama

    Energy Technology Data Exchange (ETDEWEB)

    Goncalves, Cinthia Graciele

    2008-07-01

    In Brazil, the multi mixture have being used since the eighties as an alternative against severe infantile malnutrition of the poorest population. However, its use is still reason of controversies mainly due to: the presence of anti nutritional factors, the microbiological quality and the nutritional value. Considering the routine use of multi mixture in the region, this work aimed to evaluate samples of multi mixture were collected in the metropolitan area of the City of Belo Horizonte/MG for determining the anti nutritional factors (phytic and oxalic acids), the microbiological quality, the centesimal and mineral composition, and still the induced effect in these factors of the gamma radiation. For the analyses, the samples passed by the process of gamma irradiation at doses of: 2, 4, 6, 8 and 10 kGy and then were evaluated anti nutritional factors (phytic acid and oxalic), the microbiological quality (yeasts and molds, Salmonella, Coagulase positive Staphylococcus, Bacillus cereus, coliform to 45 deg C) to full percentage (moisture, ash, proteins, carbohydrates and lipids) and the efficiency of the method of Paramagnetic Electronic Resonance (EPR) in the detection of irradiated samples. The mineral composition of the samples was carried out by the irradiation by Neutronic Activation. The methods used were searched in literature. The obtained results suggest that the concentration of the phytic and oxalic acids can not be appropriated for the children with severe nutritional deficit and that it would be necessary additional control in their daily ingestion due to the absorption of essential minerals. In general the samples had presented acceptable microbiological quality for consumption, except by one of it. The data of the centesimal and mineral composition, in the usually recommended portions, showed lower concentration than recommended for children. Any significant alteration in phytic and oxalic acids as well as in the centesimal composition were detected after gamma irradiation. The electronic paramagnetic resonance can be detected irradiated samples. (author)

  20. Evaluation by instrumented indentation of the damage caused by gamma radiation on polymeric materials; Avaliacao por indentacao instrumentada dos danos causados pela radiacao gama em materiais polimericos

    Energy Technology Data Exchange (ETDEWEB)

    Rosa, M.P.; Azevedo, E.C.; Miquelin, C.A.; Soboll, D.S., E-mail: helunica@yahoo.com.b [Universidade Tecnologica Federal do Parana (DAFIS/UTFPR), Curitiba, PR (Brazil). Dept. Academico de Fisica

    2010-07-01

    Several materials with densities close to water are used as phantoms in dosimetry. Such materials are damaged because they are exposed to radiation, the surface layers suffer the largest changes. This damage can be assessed by instrumented indentation. This paper investigates the variations in hardness and elastic modulus of samples of polymethyl-methacrylate, polyvinyl chloride, polyacetal and polypropylene before and after being irradiated with gamma radiation dose 500 Gy, using a Nanoindeter XP, with applied loads between 1 mN and 400 mN. The results are discussed correlating the variations in the mechanical properties of polymers with their applications. (author)

  1. Evaluation of peach palm (Bactris gasipaes Kunth) processed by radiation;Avaliacao do palmito pupunha (Bactris gasipaes Kunth) processado por radiacao ionizante

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Priscila Vieira da

    2009-07-01

    The peach palm can be obtained from several species of palms, but the peach palm has attracted great interest by producers, as has characteristics of precocity, rusticity and tillering, producing a palm-quality differentiating it from other palmettos for their sweet flavor and yellowish . The food irradiation has been used as a treatment to ensure microbiological food safety of products to avoid infection. Its use combined with minimal processing could increase the safety and quality of minimally processed vegetables. We aimed at evaluating the effect of gamma radiation and electron beams to control bacteria; assess the physical characteristics through analysis of color and texture in peach palm in natura minimally processed and subjected to ionizing radiation stored at 8 deg C as well as evaluating the sensory characteristics. The results in the microbiological analysis showed that ionizing radiation promotes reduction of microbial load in both treatments. In the analysis of color we can conclude that among all the treatments the sample irradiated with 1.5 kGy showed more differences when compared with the other samples. Observing texture characteristics we could conclude that irradiation changed the texture of the palm, unlike the treatment by electron beams that showed no difference between samples. For the sensory analysis, the gamma radiation with dose of 1.5 kGy, induced changes in sensory properties to the attributes and overall appearance. The dose of 1 kGy caused no significant difference, so a recommended dose for the irradiation of the studied product. (author)

  2. High performance liquid chromatography (HPLC) evaluation of carotenoids in irradiated guavas; Avaliacao por cromatografia liquida de alta eficiencia (CLAE) de carotenoides em goiabas irradiadas

    Energy Technology Data Exchange (ETDEWEB)

    Lima, Keila S. Cople; Vital, Helio C. [Centro Tecnologico do Exercito (CTEx), Rio de Janeiro, RJ (Brazil). Secao de Defesa Nuclear]. E-mail: keilacople@ig.com.br; Lima, Antonio L. Santos; Pereira, Maria Helena G. [Centro Tecnologico do Exercito (CTEx), Rio de Janeiro, RJ (Brazil). Secao de Quimica]. E-mail: stolima@ipd.eb.br; Godoy, Ronoel L. Oliveira; Fonseca, Marcos J.O. [Embrapa Agroindustria de Alimentos, Rio de Janeiro, RJ (Brazil)]. E-mail: ronoel@ctaa.embrapa.br

    2005-07-01

    The use of ionizing gamma irradiation has shown very effective as an auxiliary technology for the decrease of post-harvest waste, grains disinfestation, pathogenic microorganisms control, increase in shelf life for meats, fruits, vegetables and bulbs and tubercles sprouts inhibition, maintaining nutritional quality. The carotenoids are pigments widely found in fruits and vegetables and are beneficial to human being health. This work was undergone using the irradiator with cesium source at the Army Technological Center, Brazil, with maximum dose rate of 2 kGy per hour. The objective is to evaluate the low gamma radiation doses (0.5, 1.0 and 1.5 kGy) influence in the total carotenoid and content lycopene in guavas CV Pal uma, with excellent weight classification. The total carotenoid content was extracted from the guava with acetone and moved to petroleum ether and determined by spectrophotometer at 450 nm. The determination of lycopene was accomplished by HPLC. The results showed that, in spite of lycopene loss with irradiation, the best dose was 0.5 kGy. (author)

  3. Evaluation of thermal stability of paraffin wax by differential scanning calorimetry; Avaliacao da estabilidade termica de parafina por calorimetria diferencial de varredura

    Energy Technology Data Exchange (ETDEWEB)

    Godinho, K.O.; Silva, A.G.P.; Holanda, J.N.F. [Universidade Estadual do Norte Fluminense (LAMAV/UENF), Campos dos Goytacazes, RJ (Brazil). Grupo de Materiais Ceramicos], Email: holanda@uenf.br

    2010-07-01

    Phase change materials for heat storage are used as passive solar energy storage materials, which can be impregnated into construction materials. In this work the thermal stability (heating/cooling cycle) of the paraffin wax was investigated using differential scanning calorimetry. The latent heat and fusion temperature were determined for the following thermal cycles: 0, 30, 180 and 360. The thermal stability for paraffin wax infiltrated in support of gypsum was also determined. The experimental results showed that the paraffin wax showed good thermal stability in the states pure and infiltrated for up to 360 thermal cycles. (author)

  4. Analysis of an in-line diesel production system through event driven simulation; Avaliacao do esquema de producao em linha de diesel atraves da simulacao por eventos discretos

    Energy Technology Data Exchange (ETDEWEB)

    Monteiro, Gilsa P.; Naegeli, Guilherme S.T. [PETROBRAS S.A., Rio de Janeiro, RJ (Brazil). Centro de Pesquisas (CENPES); Santos, Nilza M.Q. [PETROBRAS S.A., Mataripe, Salvador, BA (Brazil). Refinaria Landulfo Alves (RLAM); Netto, Joaquim D.A. [DNV Energy Solutions, Porto Alegre, RS (Brazil)

    2008-07-01

    The interactions between refining processes (such as distillation, hydrotreatment, etc.) and typical transfer and storage operations (mixtures, decantation, storage, etc.) provide a high complexity to the refineries production systems of petroleum derivatives. These production systems are characterized by many aspects, such as: blending rules, feed composition, petroleum campaigns, storage tanks limitations, continuous and batch processes interactions, etc. Besides these operational aspects, the equipment and systems' reliability has strong influence on the level of production goals achievement and petroleum derivatives quality specification. Looking for a higher economic efficiency and in order to provide refineries with orientation about resources optimization for their petroleum derivatives' production systems, the development of a methodology capable of being applied since the design phase to identify systems limitations and improvement opportunities, considering all the raised aspects, is a very important task. With this objective, this article presents the main points of an evaluation that was conducted during the conceptual design for a diesel in-line blending production system proposed by a Brazilian refinery, detailing the main steps of the methodology that was developed through this analysis, based on discrete event simulation. (author)

  5. Evaluation of performance of food packagings when treated with ionizing radiation; Avaliacao do desempenho de embalagens para alimentos quando submetidas a tratamento por radiacao ionizante

    Energy Technology Data Exchange (ETDEWEB)

    Moura, Esperidiana Augusta Barretos de

    2006-07-01

    In this study the mechanical properties (tensile strength and percentage elongation at break and penetration resistance), optical properties, gas oxygen and water vapor permeability, the overall migration tests into aqueous food simulant (3% aqueous acetic acid) and fatty food simulant (n-heptane), as well as the formation of volatile radiation product tests were used to evaluate the effects of ionizing radiation (gamma irradiation or electron-beam irradiation) on commercial monolayer and multilayer flexible plastics packaging materials. These films are two typical materials produced in Brazil for industrial meat packaging, one of them is a monolayer low-density polyethylene (LDPE) and other is a multilayer co extruded low-density polyethylene (LDPE), ethylene vinyl alcohol (EVOH), polyamide (PA) based film (LDPE/EVOH/PA). Film samples were irradiated with doses up to 30 kGy, at room temperature and in the presence of air with gamma rays using a {sup 60}Co facility and electron beam from 1.5 MeV electrostatic accelerator. Alterations of these properties were detected according to the dose applied initially eight day after irradiation took place and new alterations of these values when the properties were evaluate two to three months after irradiation process. The results showed that scission reactions are higher than cross-linking process for both studied films, irradiated with gamma rays and electron beam. The evaluated properties of the irradiated films were not affected significantly with the dose range and period studied. The monolayer Unipac PE-60 and the multilayer Lovaflex CH 130 films can be used as food packaging materials for food pasteurization and in the sterilization process of by ionizing radiation using a gamma facilities and electron beam accelerators in commercial scale. (author)

  6. Enzymes evaluation for the polymeric filter cake removal; Avaliacao de enzimas para remocao de reboco formado por fluidos polimericos de base agua

    Energy Technology Data Exchange (ETDEWEB)

    Kameda, Etel; Coelho, Maria Alice Z. [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil). Escola de Quimica; Langone, Marta A.P. [Universidade do Estado do Rio de Janeiro (UERJ), RJ (Brazil). Inst. de Quimica; Queiroz Neto, Joao C. de [PETROBRAS, Rio de Janeiro, RJ (Brazil). Centro de Pesquisas (CENPES)

    2004-07-01

    In the drilling wells in horizontal or complex configurations, the drilling fluid contact with the productive zone can reduce the productivity by fluid invasion in the borehole wall. Drilling fluids usually comprise natural polymers as starch and xanthan gum. These polymers are deposited as the filter-cake on the wellbore wall. A common approach to remove this filter-cake is the application of acids or strong oxidative solutions. However, these are non-specific species which will react with any encountered that is acid soluble or oxidizable. An alternative is the use of enzymatic preparations that are able to hydrolyze such polymers. The enzymes catalyze only certain specific substrates, are inherently environmentally friendly, the enzymatic degradation rate is slower than that achieved by the oxidative species, so the enzymes produces an uniform filter cake degradation. In this work, the kinetic behaviors of an enzymatic filter-cake breaker and a commercial thermo stable enzymatic complex were analyzed. Both kinetic profiles were very similar, as well as its electrophoresis analysis. The protein in each product showed identical molecular weight. The commercial enzymatic complex stability remained 58.56% of enzymatic activity after 30 days at 40 deg C. Stability at wellbore conditions can be considered similar for both products. At 65 deg C they showed the same enzymatic activity after 8 hours. After 3 hours at 80 deg C, the commercial enzymatic complex remained 29.89% of the initial activity and the filter-cake breaker 61.73%, while at 95 deg C remained 4.39% and 11.60% of the initial activity, respectively, after 15 minutes. (author)

  7. Proteinas do liquido cefalorraqueano: I. Estudo comparativo entre metodos de concentração

    Directory of Open Access Journals (Sweden)

    Lucia M. Singer Vermes

    1983-03-01

    Full Text Available No intuito de escolher entre métodos de concentração, aplicáveis ao LCR, aquele que, não provocando desnaturação de proteínas, seja o mais exato, preciso e de fácil aplicação em laboratórios de rotina, foram estudados quatro procedimentos: diálise contra solução de goma-arábica, centrífugo-ultrafiltração, absorção de substâncias de baixo peso molecular por gel seco de poliacrilamida e ultrafiltração sob pressão positiva. Concluiu-se que a diálise contra solução de goma-arábica, por ser preciso, relativamente exato, simples e pouco oneroso, é o mais satisfatório dentre os métodos estudados.

  8. Apendicitis por Paracoccidioides brasiliensis.

    OpenAIRE

    MUÑOZ URRIBARRI, Ana Beatriz; CHAPARRO DAMMERT, Eduardo; FERRUFINO LLACH, Juan Carlos; VASQUEZ FLORES, Luciola

    2012-01-01

    La paracoccidioidomicosis es la micosis más prevalente en Sudamérica. La forma aguda afecta el sistema fagocítico mononuclear de niños y personas inmunocomprometidas. El compromiso gastrointestinal es frecuente y su patogenia implica diseminación hematógena y linfática. La linfadenomegalia abdominal causa obstrucción intestinal y abdomen agudo. En este artículo damos a conocer el caso de un niño con compromiso gastrointestinal por apendicitis. Este es el primer caso reportado de apendicitis p...

  9. Meningitis por Streptococcus suis

    OpenAIRE

    Geffner Sclarsky, D. E.; Moreno Muñoz, R.; Campillo Alpera, Mª.S.; Pardo Serrano, F.J.; Gómez Gómez, A.; Martínez-Lozano, Mª.D.

    2001-01-01

    La infección humana por Streptococcus suis (S. suis) es una zoonosis, con un riesgo ocupacional conocido y que suele presentarse como meningitis purulenta, que tiene baja mortalidad y frecuentes secuelas de hipoacusia y ataxia. Se han publicado menos de 150 casos humanos desde el informe original de hace 30 años. Hay una reconocida distribución geográfica viviendo la mayoría de los afectados en el norte de Europa y el sudeste Asiático. En España se han comunicado dos pacientes con enfermedad ...

  10. Por mil devaluados pesos

    Directory of Open Access Journals (Sweden)

    Annie Rodríguez Collázos

    2013-03-01

    Full Text Available El estudio de lo popular y lo urbano hasta ahora se ha centrado en el comportamiento y en algunas relaciones de los habitantes con su entorno. “Por mil devaluados pesos. Publicidad popular y urbana”, pretende explorar las formas de publicidad, dispersas en diferentes espacios populares y urbanos en Bogotá, identificando esquemas y formas características de sus propios códigos comunicativos; se centran en un objeto de estudio consistente en las estrategias publicitarias y los códigos comunicativos en los mensajes publicitarios populares en las subculturas de San Victorino, 7 de Agosto y Sanandresito de San José.

  11. Proposed method for the hydraulic design of ski-jump energy dissipators in dam spillways considering the occurrence of scour holes downstream of the structure; Metodo propuesto para el diseno hidraulico de trampolines empleados como disipadores de energia en aliviaderos para presas, considerando la ocurrencia del cono de socavacion al pie del mismo

    Energy Technology Data Exchange (ETDEWEB)

    Pardo-Gomez, Rafael [Centro de Investigaciones Hidraulicas (Cuba)

    2008-04-15

    Ski-jump energy dissipators are widely used in hydraulic engineering because of their well-known effectiveness. Nevertheless, some uncertainty exits associated with the dimensions of the scour hole appearing downstream of the structure. This paper presents a new method for solving this problem. This method includes spillway stability checking as part of the design process and also stability checking of any other construction near the energy dissipation zone. [Spanish] Los disipadores de energia tipo trampolin tienen amplia utilizacion en la practica de la ingenieria hidraulica por su probada eficacia; sin embargo, su diseno esta sujeto a cierto grado de incertidumbre en cuanto a la prediccion de las dimensiones del cono de socavacion que habra de producirse aguas abajo de la estructura. En el presente trabajo se muestra un metodo novedoso, mediante el cual el autor soluciona el aspecto antes referido, toda vez que se incluye como parte del proceso de diseno la comprobacion de la estabilidad del propio aliviadero o de cualquier otra obra cercana a la zona de disipacion de energia.

  12. Rapid Methods of Determining Internal Radioactive Contamination; Methodes Rapides Permettant d'Evaluer la Contamination Radioactive Interne; 0411 042b 0414 ; Metodos Rapidos para Determinar la Contaminacion Radiactiva Interna

    Energy Technology Data Exchange (ETDEWEB)

    Sedlet, J.; Fairman, W. D.; Robinson, J. J. [Industrial Hygiene and Safety Division, Argonne National Laboratory, Argonne, IL (United States)

    1965-06-15

    de rayos X in vivo, recuento gamma y de rayos X en muestras de excreta y de sangre no preparadas, y separacion radioquimica de la muestras de excreta y de la sangre, seguidas de recuento. Los autores examinan el campo de aplicacion, las restricciones y la sensibilidad de cada metodo, asi como el tiempo requerido para determinados radionuclidos, incluyendo actfnidos, productos de fision corrientes y emisores beta de baja energia. Indican los metodos aplicados con prioridad; un metodo se considera adecuado cuando permite detectar en algunas horas una dosis absorbida equivalente a la menor carga corporal admisible que especifica la Comision Internacional de Proteccion Radiologica. Aunque esta sensibilidad no es necesaria en todos los casos, deberia ser siempre suficiente y, en general, puede alcanzarse. Las mayores dificultades se encuentran con los emisores alfa y los emisores beta puros de baja energia ya que, en general, la carga corporal en estos nuclidos debe determinarse por analisis radioquimico de la sangre y los excreta. La memoria describe los procedimientos de separacion radioquimica desarrollados y utilizados en el Laboratorio Nacional de Argonne para la determinacion rapida de estos nuclidos. Por otra parte, la memoria examina algunos de los problemas que se plantean para calcular las cargas corporales poco despues de la absorcion a partir de los indices de excrecion. Durante este periodo, las concentraciones varian rapidamente y en forma desconocida para muchos nuclidos importantes. Cuando la absorcion ha sido muy elevada o muy reducida, no es necesario determinar inmediata y exactamente las cargas corporales. No obstante, existe para cada radionuclido un grado intermedio de absorcion que exige determinar rapidamente y con exactitud suficiente la carga corporal para decidir si es necesario proceder a un tratamiento. La memoria discute las propiedades y los factores que dificultan la valoracion de los elementos osteofilos en caso de accidente. (author

  13. Origin identification for Cantona, Puebla, obsidians by the analysis method of neutron activation (NAA); Identificacion de procedencia para obsidianas de Cantona, Puebla, por el metodo de analisis por activacion neutronica (AAN)

    Energy Technology Data Exchange (ETDEWEB)

    Tellez N, A. L.

    2013-07-01

    There are tests that most of the obsidian worked in the workshops of Cantona, Puebla, is coming from the mineral deposits of Oyameles-Zaragoza, but also has been detected obsidian that macroscopically belongs to other mineral deposits. The present work has as purpose to determine the provenance of an obsidian sample obtained in the Cantona Site to know if there was the presence of obsidian of other mineral deposits. For the study the neutron activation analysis was used to identify the presence of other deposits. An explanation on the treatment to the selected pieces is included, the preparation of the same ones for its irradiation in the nuclear reactor, the counting and statistical study of the results. Finally the results of the selected samples are presented, indicating their origin places, that time comes and the interpretation of the results is given. (Author)

  14. Contact stress by the method of finite elements of the steel AISI 1045 hardened by roller; Tensiones de contacto por el metodo de elementos finitos del acero AISI 1045 endurecido por rodillo

    Energy Technology Data Exchange (ETDEWEB)

    Fernandez-columbie, T.; Rodriguez-Gonzalez, I.; Alcantara-Borges, D.; Fernandez-Guilarte, E.

    2012-11-01

    In this paper, the tense-deformational behavior is analyzed by means of simulation using the finite element method for AISI 1045 cold rolled deformed steel. ANYSYS V.10 software was used in this study. Revolution number, compressive strength and tool feed rate were the variables considered in the deformation process. They allowed determining the contact stress of the deformed material. The material used was 30 mm diameter and 100 mm length. Samples of 30 mm diameter and 3 mm thickness were prepared for the optical microscopic observation, which were compared to the results obtained from the simulation. The tensile status of the deformed samples was evaluated as from the reduction of the average size of the grains as per the strength applied. This study intends to show that the cold hardening method is a surface hardening option. (Author)

  15. A comparative analysis of the EEDF obtained by Regularization and by Least square fit methods; Un analisis comparativo de la EEDF obtenido por metodos de regularizacion y por un ajuste de minimos cuadrados

    Energy Technology Data Exchange (ETDEWEB)

    Gutierrez T, C.; Flores Ll, H. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    2004-07-01

    The second derived of the characteristic curve current-voltage (I - V) of a Langmuir probe (I - V) is numerically calculated using the Tikhonov method for to determine the distribution function of the electrons energy (EEDF). One comparison of the obtained EEDF and a fit by least square are discussed (LS). The I - V experimental curve is obtained in a plasma source in the electron cyclotron resonance (ECR) using a cylindrical probe. The parameters of plasma are determined of the EEDF by means of the Laframboise theory. For the case of the LS fit, the obtained results are similar to those obtained by the Tikhonov method, but in the first case the procedure is slow to achieve the best fit. (Author)

  16. Preparation of standard mixtures of gas hydrocarbons in air by the diffusion dilution method; Preparacion de mezclas patrones de hidrocarburos gaseosos en aire por el metodo de dilucion por difusion

    Energy Technology Data Exchange (ETDEWEB)

    Garcia, M R; Perez, M M

    1979-07-01

    An original diffusion system able to produce continuously gaseous samples is described. This system can generate samples with concentrations of benzene in air from 0.1 to 1 ppm a reproducible way. The diffusion dilution method used Is also studied. The use of this diffusion system has been extended to the preparation of binary mixtures (benzene-toluene). Whit a secondary dilution device is possible preparing these mixtures over a wide range of concentrations (0.11 to 0.04 ppm for benzene and 0.06 to 0.02 for toluene). (Author) 7 refs.

  17. Sepsis por shigella flexneri

    Directory of Open Access Journals (Sweden)

    César Cabrera C

    2005-04-01

    Full Text Available Se presenta un caso raro de sepsis por Shigella flexneri en una paciente de 45 años de edad quien estando hospitalizada para el estudio de un tumor cerebral, requirió el uso de manitol y dosis altas de corticoides; luego de ello presenta deposiciones líquidas con moco y sangre, desarrolla síndrome de respuesta inflamatoria sistémica, luego se aísla Shigella flexneri en el hemocultivo; recibió tratamiento antibiótico con ciprofloxacina. Se describen las características del caso y se comenta de acuerdo con la revisión de literatura.

  18. Portable exhausters POR-004 SKID B, POR-005 SKID C, POR-006 SKID D storage plan

    International Nuclear Information System (INIS)

    Nelson, O.D.; Keller, G.M.

    1997-01-01

    This document provides a storage plan for portable exhausters POR-004 SKID B, POR-005 SKID C, AND POR-006 SKID D. The exhausters will be stored until they are needed by the TWRS (Tank Waste Remediation Systems) Saltwell Pumping Program. The storage plan provides criteria for portable exhauster storage, periodic inspections during storage, and retrieval from storage

  19. Non-Destructive Methods for Determining Burn-Up in Nuclear Fuel; Methodes Non Destructives d'Evaluation du Taux de Combustion dans le Combustible Nucleaire; Metody opredeleniya vygoraniya v yadernom toplive bez razrusheniya obraztsa; Metodos No Destructivos para Determinai el Grado de Combustion de los Elementos Combustibles Nucleares

    Energy Technology Data Exchange (ETDEWEB)

    McGonnagle, W. J. [Illinois Institute of Technology, Chicago, IL (United States)

    1966-02-15

    repercute en los calculos que pueden efectuarse. Otra de las dificultades de la determinacion no destructiva consiste en la presencia de intensos campos de radiaciones que contribuyen al 'ruido' defondo dela medicion. La preparacion de patrones eficaces es dificil. Aunque en el estado actual de la tecnica carezcan de la precision deseada, los metodos no destructivos para determinar el grado de combustion resultan utiles sobre todo cuando es preciso obtener rapidamente valores aproximados sin que el costo de la operacion resulte excesivo. Para determinar el grado de combustion se han empleado, se estan estudiando o se han propuesto diversos metodos no destructivos. Se han empleado varios tipos de espectrometro -el de cristal curvo, el magnetico de Compton, el de coincidencia de Compton y el de centelleo- para analizar la radiacion gamma proveniente del material radiactivo formado durante el proceso de fision. Entre otros metodos no destructivos cabe mencionar la activacion de laminas, la transmision neutronica, el analisis por activacion, la medicion de rayos gamma de captura y la medicion de neutrones rapidos y retardados. En la memoria se exponen los principios basicos de cada uno de los instrumentos y de los metodos mencionados y se formulan observaciones sobre su sensibilidad y sus inconvenientes. . El autor propone metodos no destructivos basados en el empleo de isotopos estables producidos durante el proceso de fision. Con el empleo de esos isotopos los datos relativos a las irradiaciones precedentes tienen una importancia secundaria y los relativos al tiempo de enfriamiento no tienen ninguna. Ademas, para los productos estables de fision se dispone de datos nucleares mas precisos. Entre los isotopos estables producidos durante el proceso de fision, los mas utiles parecen ser el circonio, el molibdeno, el rutenio y el neodimio. En la memoria se analizan todos los metodos propuestos. (author) [Russian] Metody kolichestvennogo izmerenija vygoranija toplivnyh jelementov v

  20. Pressure surge generated by start up of pumping equipment in pipes to pressure. Application to a real case; Transitorios hidraulicos generados por arranque de equipo de bombeo en conducciones a presion. Aplicacion a un caso real

    Energy Technology Data Exchange (ETDEWEB)

    Carmona Paredes, L.G.; Carmona Paredes, R.B. [Instituto de Ingenieria, UNAM, Mexico, D.F. (Mexico)

    2000-12-01

    Water closed conduits are commonly designed with special attention paid to pressure surges due to pumping failures. In some particular cases, such at the Rio Yaqui-Guaymas water pipeline system, pressure surges due to pumping start ups are as high and dangerous as those produced by pumping failures. New subroutines were thus developed and included in the Closed Conduit Flow Transient Model developed by the Instituto de Ingenieria of the Universidad Nacional Autonoma de Mexico. This paper presents the mathematical model and its numerical solution using the Method of Characteristics and the Newton-Raphson Method. With the new modeling system it is possible to evaluate the pressure fluctuation time series due to start up at any pumping system. Using this new system a reliable explanation of bursts at the Rio Yaqui-Guaymas system could be set forth. [Spanish] Al disenar conducciones a presion, es comun que se preste especial atencion a los transitorios hidraulicos generados por paros de emergencia de los equipos de bombeo. En el acueducto rio Yaqui-Guaymas, Sonora, Mexico, los transitorios generados al poner en marcha los equipos de bombeo son tan importantes como los producidos por disparo de bombas. En el Instituto de Ingenieria de la UNAM, se desarrollo e implanto en su programa de simulacion de transitorios hidraulicos en tuberias a presion una subrutina para simular el arranque de equipos de bombeo. El modelo matematico esta formado por el conjunto de ecuaciones dinamica y de continuidad, asi como la condicion de frontera que describe el arranque de las bombas. Se reescriben las ecuaciones dinamica y de continuidad, con el metodo de las caracteristicas y se plantea un sistema de ecuaciones no lineales, el cual se resuelve con el metodo de las caracteristicas y se plantea un sistema de ecuaciones no lineales, el cual se resuelve con el metodo de newton-raphson. La simulacion del arranque de las bombas del acueducto en estudio, arroja valores de las cargas

  1. Control Multivariable por Desacoplo

    Directory of Open Access Journals (Sweden)

    Fernando Morilla

    2013-01-01

    Full Text Available Resumen: La interacción entre variables es una característica inherente de los procesos multivariables, que dificulta su operación y el diseño de sus sistemas de control. Bajo el paradigma de Control por desacoplo se agrupan un conjunto de metodologías, que tradicionalmente han estado orientadas a eliminar o reducir la interacción, y que recientemente algunos investigadores han reorientado con objetivos de solucionar un problema tan complejo como es el control multivariable. Parte del material descrito en este artículo es bien conocido en el campo del control de procesos, pero la mayor parte de él son resultados de varios años de investigación de los autores en los que han primado la generalización del problema, la búsqueda de soluciones de fácil implementación y la combinación de bloques elementales de control PID. Esta conjunción de intereses provoca que no siempre se pueda conseguir un desacoplo perfecto, pero que sí se pueda conseguir una considerable reducción de la interacción en el nivel básico de la pirámide de control, en beneficio de otros sistemas de control que ocupan niveles jerárquicos superiores. El artículo resume todos los aspectos básicos del Control por desacoplo y su aplicación a dos procesos representativos: una planta experimental de cuatro tanques acoplados y un modelo 4×4 de un sistema experimental de calefacción, ventilación y aire acondicionado. Abstract: The interaction between variables is inherent in multivariable processes and this fact may complicate their operation and control system design. Under the paradigm of decoupling control, several methodologies that traditionally have been addressed to cancel or reduce the interactions are gathered. Recently, this approach has been reoriented by several researchers with the aim to solve such a complex problem as the multivariable control. Parts of the material in this work are well known in the process control field; however, most of them are

  2. A reverse method to estimate initial temperatures in geothermal reservoirs; Un metodo inverso para estimacion de la temperatura inicial de yacimientos geotermicos

    Energy Technology Data Exchange (ETDEWEB)

    Garcia Gutierrez, Alfonso [Instituto de Investigaciones Electricas, Gerencia de Geotermia, Cuernavaca, Morelos (Mexico)]. E-mail: aggarcia@iie.org.mx; Ramos Alcantara, Jose R. [Centro Nacional de Investigacion y Desarrollo Tecnologico, Departamento de Ingenieria Mecanica, Cuernavaca, Morelos (Mexico); Arellano Gomez, Victor M. [Instituto de Investigaciones Electricas, Gerencia de Geotermia, Cuernavaca, Morelos (Mexico)

    2010-01-15

    A method is presented for estimating the initial temperature in geothermal-reservoir formations. The method is based on control theory where the measured temperatures or temperature logs are compared with corresponding simulated temperatures for different times with the well closed. The comparison is made using a control algorithm that makes changes to the originally assumed reservoir temperatures and performs iterations until the best fit between the temperature logs and the simulated temperatures is obtained. The simulation of fluid transport and heat in the well includes the processes of circulation and stop in the presence of circulation losses, modeled on macroscopic balances of momentum and energy. The transport processes in the formation regard the reservoir as an isotropic porous medium and fluid flow is described by Darcy's law. This model generates the fields of temperatures, pressures and speeds as a function of time and space. The method was tested with data from well LV-3 in Las Tres Virgenes geothermal field, Baja California Sur, Mexico. The estimated temperatures of the undisturbed formation-or initial temperatures-are compared within {+-}15 degrees Celsius with the measured temperatures, which is an acceptable outcome from an engineering point of view. [Spanish] Se presenta un metodo para la estimacion de la temperatura inicial en las formaciones de yacimientos geotermicos. El metodo se basa en la teoria de control donde las temperaturas medidas o registros de temperatura se comparan con las correspondientes temperaturas simuladas a diferentes tiempos con el pozo cerrado. La comparacion se hace usando un algoritmo de control el cual hace cambios a las temperaturas de yacimiento originalmente supuestas y realiza iteraciones hasta que se obtiene el mejor ajuste entre los registros de temperatura y las temperaturas simuladas. La simulacion del transporte de fluidos y calor en el pozo incluye los procesos de circulacion y paro en presencia de

  3. Dose assessment in pediatric computerized tomography; Avaliacao de doses em tomografia computadorizada pediatrica

    Energy Technology Data Exchange (ETDEWEB)

    Vilarinho, Luisa Maria Auredine Lima

    2004-07-01

    The objective of this work was the evaluation of radiation doses in paediatric computed tomography scans, considering the high doses usually involved and the absence of any previous evaluation in Brazil. Dose values were determined for skull and abdomen examinations, for different age ranges, by using the radiographic techniques routinely used in the clinical centers investigated. Measurements were done using pencil shape ionization chambers inserted in polymethylmethacrylate (PMMA) phantoms. These were compact phantoms of different diameters were specially designed and constructed for this work, which simulate different age ranges. Comparison of results with published values showed that doses were lower than the diagnostic reference levels established to adults exams by the European Commission. Nevertheless, doses in paediatric phantoms were higher than those obtained in adult phantoms. The paediatric dose values obtained in Hospitals A and B were lower than the reference level (DRL) adopted by SHIMPTON for different age ranges. In the range 0 - 0.5 year (neonatal), the values of DLP in Hospital B were 94 por cent superior to the DRL For the 10 years old children the values of CTDI{sub w} obtained were inferior in 89 por cent for skull and 83 por cent for abdomen examinations, compared to the values published by SHRIMPTON and WALL. Our measured CTDI{sub w} values were inferior to the values presented for SHRIMPTON and HUDA, for all the age ranges and types of examinations. It was observed that the normalized dose descriptors values in children in the neonatal range were always superior to the values of doses for the adult patient. In abdomen examinations, the difference was approximately 90% for the effective dose (E) and of 57%.for CTDI{sub w} . (author)

  4. L’utilizzo della ricostruzione nella comunicazione del patrimonio archeologico. L’approccio, il metodo, le finalità e alcuni spunti di discussione.

    Directory of Open Access Journals (Sweden)

    Elena Bacci

    2010-05-01

    In questo contributo si focalizza l’attenzione sulla ricostruzione grafica e virtuale del patrimonio e sulle sensazioni che la ricostruzione evoca nel fruitore del messaggio culturale. La ricostruzione si attua mediante la collaborazione tra archeologo e illustratore e costituisce un momento di verifica visiva dell’interpretazione archeologica e uno strumento di comunicazione del dato archeologico fruibile a più livelli. Ciò avviene grazie allo scambio costante di informazioni (dati scientifici e proposte di ricostruzione e il confronto che ne deriva determina i metodi e le fasi di avanzamento del progetto. Il metodo si basa sull’integrazione delle immagini 3D con il disegno tradizionale ed è finalizzato alla trasposizione del dato archeologico, in modo tale da garantire alla ricostruzione il duplice requisito di soddisfazione estetica e credibilità scientifica.

  5. Evaluation of the of thermal shock resistance of a castable containing andalusite aggregates by thermal shock cycles; Avaliacao da resistencia ao dano por choque termico por ciclagem de um concreto refratario contendo agregados de andaluzita

    Energy Technology Data Exchange (ETDEWEB)

    Garcia, G.C.R.; Santos, E.M.B.; Ribeiro, S., E-mail: girribeiro@yahoo.com.br [Universidade de Sao Paulo (DEMAR/EEL/USP), Lorena, SP (Brazil). Escola de Engenharia de. Departamento de Engenharia de Materiais; Resende, W.S. [Industrias Brasileiras de Artigos Refratarios (IBAR), Lorena, SP (Brazil); Rodrigues, J.A. [Universidade Federal de Sao Carlos (UFSCar), SP (Brazil)

    2011-07-01

    The thermal shock resistance of refractory materials is one of the most important characteristics that determine their performance in many applications, since abrupt and drastic differences in temperature can damage them. Resistance to thermal shock damage can be evaluated based on thermal cycles, i.e., successive heating and cooling cycles followed by an analysis of the drop in Young's modulus occurring in each cycle. The aim of this study was to evaluate the resistance to thermal shock damage in a commercial refractory concrete with andalusite aggregate. Concrete samples that were sintered at 1000 deg C and 1450 deg C for 5 hours to predict and were subjected to 30 thermal shock cycles, soaking in the furnace for 20 minutes at a temperature of 1000 deg C, and subsequent cooling in circulating water at 25 deg C. The results showed a decrease in Young's modulus and rupture around 72% for samples sintered at 1000 ° C, and 82% in sintered at 1450 ° C. The refractory sintered at 1450 deg C would show lower thermal shock resistance than the refractory sintered at 1000 deg C. (author)

  6. Dyes removal of textile wastewater onto surfactant modified zeolite from coal ash and evaluation of the toxic effects; Remocao de corantes de efluente textil por zeolita de cinzas de carvao modificada por surfactante e avaliacao dos efeitos toxicos

    Energy Technology Data Exchange (ETDEWEB)

    Ferreira, Patricia Cunico

    2015-07-01

    Zeolites synthesized from fly and bottom ashes and modified with hexadecyltrimethylammonium (HDTMA) were used as adsorbent to remove dyes - Solophenyl Navy (SN) and Solophenyl Turquoise (ST) and their hydrolysed forms Solophenyl Navy Hydrolysed (SNH) and Solophenyl Turquoise Hydrolysed (STH), from simulated textile wastewater. The HDTMA-modified fly zeolite (ZMF) and HDTMA-modified bottom zeolite (ZMB) were characterized by different techniques, as X-ray fluorescence spectrometry, X-ray diffraction and scanning electron microscopy, etc. The ZMF and ZMB presented negative charge probably due to the formation of a partial bilayer of HDTMA on exchangeable active sites on the external surface of unmodified zeolite. Initial dye concentration, contact time and equilibrium adsorption were evaluated. The adsorption kinetic for SN, ST, SNH and STH onto the zeolites followed the pseudo second-order model. The equilibrium time was 20 min for SN and ST and 30 min for SNH and STH, respectively. Langmuir, Freundlich and Temkin models were applied to describe the adsorption isotherms. Adsorption of the dyes were best described by the Langmuir model, with exception to SN/ZPM, SNH/ZPM and SNH/ZLM systems that followed Freundlich model. The maximum adsorption capacities were 3,64; 3,57; 2,91 e 4,93 for SN, ST, SNH e STH by ZLM, respectively and 0,235; 0,492; 1,26 e 1,86 by ZPM, in this order. The best performance for hydrolyzed dyes has been attributed to reduction of the size of dyes molecules during the hydrolysis process. Acute toxicity of the dyes to a different organism were evaluated by different test-organisms. Waterflea, Ceriodaphnia dubia showed EC50 value of 1,25; 54,5; 0,78 and 2,56 mgL{sup -1} for SN, ST, SNH and STH, respectively. The plant Lemna minor showed EC50 values of 18,9; 69,4; 10,9 and 70,9 mgL{sup -1} for SN, ST, SNH and STH, respectively. Midges larvae of Chironomus tepperi showed EC50 values of 119 and 440 mgL{sup -1} for SN and ST, respectively. Regarding the adsorption process, acute effects were substantially reduced after adsorption treatment of aqueous solution with SN and ST by ZMF, as well as their hydrolysed forms, showing no toxicity after removal of 100% of colour. After treatment with ZPM there was an increase of the toxicity, with exception of SHN and STH dyes that do not show toxicity after the treatment. Toxicity Identification Evaluation tests (TIE) were realized in order to identify what substances were causing the observed toxicity for the SN, ST and the leached of ZMF and ZMB. The acute effects were significantly reduced after manipulation with Solid-Phase Extraction (SPE) and Ethylenediaminetetraacetic acid (EDTA) for the leached of ZMB and ZMF. The dyes showed reduced in the toxicity after manipulation with EDTA indicating that the toxicants are mostly cationic metals. (author)

  7. Instrumentos em Lingua Brasileira de Sinais para avaliacao da qualidade de vida da populacao surda

    Directory of Open Access Journals (Sweden)

    Neuma Chaveiro

    2013-06-01

    Full Text Available OBJETIVO: Construir a versão em Língua Brasileira de Sinais dos instrumentos WHOQOL-BREF e WHOQOL-DIS para avaliar a qualidade de vida da população surda brasileira. MÉTODOS: Utilizou-se metodologia proposta pela Organização Mundial da Saúde (WHOQOL-BREF e WHOQOL-DIS para a construção dos instrumentos adaptados para população surda em Língua Brasileira de Sinais (Libras. A pesquisa para execução do instrumento consistiu de 13 etapas: 1 criação do sinal qualidade de vida; 2 desenvolvimento das escalas de respostas em Libras; 3 tradução por um grupo bilíngue; 4 versão reconciliadora; 5 primeira retrotradução; 6 produção da versão em Libras a ser disponibilizada aos grupos focais; 7 realização dos grupos focais; 8 revisão por um grupo monolíngue; 9 revisão pelo grupo bilíngue; 10 análise sintática/semântica e segunda retrotradução; 11 reavaliação da retrotradução pelo grupo bilíngue; 12 filmagem da versão para o software; 13 desenvolvimento do software WHOQOL-BREF e WHOQOL-DIS em Libras. RESULTADOS: Características peculiares da cultura da população surda apontaram a necessidade de adaptações na metodologia de aplicação de grupos focais quando compostos por pessoas surdas. As convenções ortográficas da escrita das línguas sinalizadas não estão consolidadas, o que trouxe dificuldades em registrar graficamente as etapas de tradução. As estruturas linguísticas que causaram maiores problemas de tradução foram as que incluíram expressões idiomáticas do português, muitas sem conceitos equivalentes entre o português e a Libras. Foi possível construir um software do WHOQOL-BREF e WHOQOL-DIS em Libras. CONCLUSÕES: O WHOQOL-BREF e o WHOQOL-DIS em Libras possibilitarão que os surdos se expressem autonomamente quanto a sua qualidade de vida, o que permitirá investigar com maior precisão essas questões.

  8. Avaliacao da Relacao entre a Doenca Hepatica Nao Gordurosa e CAD utilizando TCMF

    Directory of Open Access Journals (Sweden)

    Duran Efe

    2014-01-01

    Full Text Available Fundamento: Alguns fatores de risco para a aterosclerose são acompanhados pela doença hepática gordurosa não alcoólica (DHGNA. Desejamos usar a tomografia computadorizada multi-fatias (TCMF como a técnica para encontrar relação entre a DHGNA e a doença arterial coronariana (DAC. Objetivo: A relação entre a DHGNA e a DAC foi investigada através de TCMF. Métodos: Um total de 372 indivíduos com ou sem sintomas cardíacos, que foram submetidos à angiografia por TCMF, foram incluídos no estudo. Os pacientes foram divididos em dois grupos, de acordo com a presença da DHGNA. Os segmentos arteriais coronarianos foram avaliados visualmente via angiografia por TCMF. Com base no grau de estenose arterial coronariana, aqueles com placas ausentes ou mínimas foram considerados como normais, enquanto aqueles que apresentavam estenose de menos do que 50% e no mínimo uma placa foram considerados como portadores da doença arterial coronariana não obstrutiva (não-obsDAC. Os pacientes que apresentaram no mínimo uma placa e estenose arterial coronariana de 50% ou mais foram considerados como portadores de doença arterial coronariana obstrutiva (obsDAC. A DHGNA foi determinada de acordo com o protocolo de TCMF, utilizando a densidade hepática. Resultados: De acordo com a densidade hepática, o número de pacientes com doença hepática gordurosa não alcoólica (grupo 1 foi de 204 (149 homens, 54,8% e com fígado normal (grupos 2 foi de 168 (95 homens, 45.2%. Houve 50 (24,5% não-obsDAC e 57 (27,9% casos de obsDAC no Grupo 1, e 39 (23,2% não-obsDAC e 23 (13,7% casos de obsDAC no Grupo 2. Conclusões: O presente estudo utilizando TCMF demonstrou que a frequência da doença arterial coronariana em pacientes com NAFDL foi significativamente superior do que nos pacientes em NAFDL.

  9. Double-Sampling Method for Carrying Out Quality Control of a Fabrication Process; Methode du Double Echantillonnage pour le Controle de la Qualite d'un Procede de Fabrication; Metod dvukh obraztsov dlya osushchestvleniya kontrolya za kachestvom v protsesse izgotovleniya; Metodo de Muestreo Doble para el Control de Calidad de un Proceso de Fabricacion

    Energy Technology Data Exchange (ETDEWEB)

    Cerrolaza, J. A.; Lago, A.; Montojo, Rosa M. [Junta de Energia Nuclear, Madrid (Spain)

    1966-02-15

    taille des echantillons et le degre de controle sont determines en fonction des risques inherents a la premiere et a la deuxieme condition. Bien que cette methode soit applicable, elle est fort peu pratique quand il s'agit de controler des pieces de reacteurs, car les echantillons qu'elle exige sont de dimensions excessives. Le memoire expose une methode analogue a celle de Cave mais qui consiste a etablir un double echantillonnage dans lequel la taille moyenne de l'echantillon est beaucoup plus reduite. (author) [Spanish] La fabricacion de componentes que han de ser empleados en reactores nucleares presenta dos caracteristicas fundamentales que condicionan el proceso: la exigencia de una calidad muy elevada que limita a valores muy bajos el porcentaje de piezas defectuosas admisibles, y el coste muy alto de cada uno de los componentes. Estas dos condiciones obligan a que el control durante la fabricacion posea una curva de operacion con potencia muy elevada, y, por otra parte, a que el numero de piezas destruidas en cada inspeccion sea un pequeno como se pueda, siempre que se cumpla la condicion anterior. Los metodos usuales de control, basados en fijar el riesgo de primera especie, no son aplicables, ya que en general su eficacia no es suficiente. Cave ha desarrollado un metodo en que, tanto el tamano de las muestras como los limites de control, se fijan en funcion de los riesgos de primera y segunda especie. Este metodo, si bien es aplicable, resulta poco practico en el control de componentes para reactores, ya que se necesitan muestras de un tamano excesivamente grande. En el presente trabajo se desarrolla un metodo semejante al de Cave, pero en el que se establece un muestreo doble, con lo que el tamano medio de la muestra es mucho mas reducido. (author) [Russian] Pri izgotovlenii komponentov dlja ispol'zovanija v reaktorah reshajushhee znachenie imejut dva osnovnyh faktora, a imenno: neobhodimost' obespechit' ochen' vysokoe kachestvo, dopuskajushhee lish' ochen

  10. Porøse materialer

    DEFF Research Database (Denmark)

    Hansen, Ernst Jan de Place

    2000-01-01

    Dette undervisningsnotat er en samling af noter, der refererer til den indledende del af kurset Materialmekanik og Porøse materailer på Insitut for Bærende Konstruktiner og Materialer (BKM).......Dette undervisningsnotat er en samling af noter, der refererer til den indledende del af kurset Materialmekanik og Porøse materailer på Insitut for Bærende Konstruktiner og Materialer (BKM)....

  11. Avaliacao de interacoes medicamentosas potenciais em prescricoes da atencao primaria de Vitoria da Conquista (BA, Brasil

    Directory of Open Access Journals (Sweden)

    Danyllo Fabio Lessa Leao

    2014-01-01

    Full Text Available As interações medicamentosas são fatores de risco para a ocorrência de reações adversas a medicamentos. Este estudo teve o objetivo de avaliar as interações medicamentosas potenciais em prescrições da atenção primária de Vitória da Conquista (BA, visando preencher a lacuna de conhecimento sobre essa temática no Brasil. Foram coletadas informações sobre diversas variáveis de prescrições oriundas da atenção primária e as interações medicamentosas avaliadas a partir dos bancos de dados do Medscape e Micromedex(r. Verificou-se ainda a frequência de polifarmácia e associação desta com a ocorrência de interações medicamentosas. Os resultados mostraram frequência de 48,9% de interações medicamentosas, 74,9% delas de gravidade moderada ou maior, e 8,6% de prescrições em polifarmácia que, em teste qui-quadrado, mostrou associação positiva com ocorrência de interações medicamentosas potenciais (p < 0,001. As prescrições oriundas da atenção primária de Vitória da Conquista (BA apresentaram uma alta frequência de interações medicamentosas, porém faz-se necessária a análise de outros fatores de risco para ocorrência destas nesse nível de atenção à saúde.

  12. A method for optimization of patient dose estimation in conventional radiology; Un metodo per l'ottimizzazione della stima della dose al paziente nella radiologia tradizionale

    Energy Technology Data Exchange (ETDEWEB)

    Tofani, A.; Del Corona, A. [Azienda Unita' Sanitaria Locale 6, Livorno (Italy). Unita' Ospedaliera di Fisica Sanitaria; Niespolo, A. [Azienda Ospedaliera Pisana, Pisa (Italy). Unita' Ospedaliera di Fisica Sanitaria

    2000-05-01

    found to depend on the average body surface, a parameter which takes into account both patient height and mass. Thus, determining the normalization factor for each projection and each view allows to estimate the absorbed dose under different geometrical conditions. The method has been verified by considering four of the most common X-ray procedures (chest AP, cervical spine LAT, lumbar spine AP and head LAT). The average error on dose estimation is about 13 %. In the very next future the method will be extended to all the projections and views of ICRP Report no. 34, and we plant to integrate the described algorithm in a computer program devoted to the automatic computation of patient dose. [Italian] Il metodo raccomandato dalla International Commission on Radiological Protection (ICRP) nel suo Report n. 34(1982) per il calcolo della dose al paziente negli esami di radiodiagnostica e' basato su dati dosimetrici tabulati ottenuti mediante simulazioni Monte Carlo su fantocci antropomorfi descritti da semplici funzioni matematiche. Nel caso del calcolo della dose per un paziente adulto, le limitazioni principali di questo metodo sono due: in primo luogo i parametri geometrici dell'esame - e in particolare la distanza fuoco-pellicola e il formato della pellicola- sono fissi, e questo rende problematico l'utilizzo dei dati dosimetrici nelle condizioni effettive in cui si e' svolto l'esame, che in genere non coincideranno con quelle standard ICRP. Inoltre quando le dimensioni e la massa del paziente differiscono sensibilmente da quelle del fantoccio utilizzato nelle simulazioni (il cosidetto uomo di riferimento, di altezza pari a 174 cm e massa di 70,9 Kg) il metodo ICRP puo' portare a errori considerevoli nella stima della dose. Lo scopo del presente lavoro e' quello di indicare una possibile via di uscita per superare queste limitazioni. L'algoritmo proposto in questo lavoro si basa sull'applicazione del metodo suggerito da Huda e

  13. Fundamentos del metodo cientifico

    Directory of Open Access Journals (Sweden)

    Badii, M. H.

    2004-01-01

    Full Text Available El objetivo de esta obra no radica en realizar una búsqueda exhaustiva de la literatura en el tema, sino, sentar las bases del método científico, notando los aspectos filosóficos e éticos de la ciencia. Se presentan los conceptos y definiciones fundamentales relacionados con la metodología de la investigación científica. Se maneja el concepto de la toma de los datos válidos como un requisito básico en cualquier trabajo científico. Se pone a disposición del lector un modelo denominado el ECOEE que es una herramienta poderosa para establecer puntos de comparación e discusión entre los resultados de diferentes trabajos científicos. Finalmente, ofrece unas sugerencias de que hacer o no hacer en cuanto a realizar un trabajo de investigación.

  14. Methodology for the accelerated simulation of the deterioration that by atmospheric corrosion appears in electronic equipment; Metodologia para la simulacion acelerada del deterioro que por corrosion atmosferica se presenta en equipo electronico

    Energy Technology Data Exchange (ETDEWEB)

    Ortiz Prado, A.; Schouwenaars, R.; Cerrud Sanchez, S.M. [Facultad de Ingenieria, UNAM, Mexico, D.F. (Mexico)

    2002-12-01

    The corrosion resistance of systems and electronic parts which are designed to work in atmospheric conditions have been tested for decades; some of these methods were the Cyclic Humidity Test, Field Tests and Salt Spray (Fog) Testing, the latter was one of the most popular methods. However, the salt spray test and most of the other existing methods do not show strong relationships with the real conditions of service. For this reason, it is necessary to develop appropriated methods and equipment for the accelerated simulation of real atmospheric corrosion phenomena. This article seeks to demonstrate the need to develop a test and the necessary equipment to reproduce the damage in electronic systems and equipment by atmospheric corrosion. [Spanish] Para la evaluacion de la resistencia a la corrosion de sistemas y equipo electronico que trabajaran bajo condiciones de deterioro generadas por el medio ambiente, se han aplicado una serie de ensayos, donde el mas popular es el de camara de niebla salina. Sin embargo, este y otros que se han elaborado para tal efecto no tienen ninguna relacion con las condiciones reales de servicio, por lo que es necesario un metodo de evaluacion que permita simular de forma acelerada los fenomenos de deterioro por efectos ambientales. Este articulo pretende demostrar la necesidad de desarrollar una prueba, que en forma acelerada, reproduzca el dano que sufre el material por efecto de la atmosfera; el cual se orienta a la evaluacion de equipo electrico y electronico.

  15. An Appraisal of Analytical Methods for Plutonium and their Applications to the Analysis of Nuclear Materials; Evaluation des Methodes Analytiques de Dosage du Plutonium et de Leur Application a l'Analyse des Matieres Nucleaires; Otsenka analiticheskikh metodov opredeleniya plutoniya i ikh primenenie dlya analiza yadernykh materialov; Metodos Analiticos de Determinacion del Plutonio y su Empleo en el Analisis de Materiales Nucleares

    Energy Technology Data Exchange (ETDEWEB)

    Milner, G. W.C.; Phillips, G. [Atomic Energy Research Establishment, Harwell, Berks. (United Kingdom)

    1966-02-15

    respectifs de la dissolution dans des melanges d'acides mineraux courants et de la dissolution faisant appel a des procedes de fusion, avec des exemples a l'appui. Les auteurs decrivent aussi les procedes utilises et les resultats obtenus, pour l'analyse des alliages Pu-U, Pu-Ce-Co et Pu-U-Mo, des oxydes et carbures de Pu-U, et des cermets de carbure de Pu-U contenant Fe, Mo et Cr. Ces matieres sont l'aboutissement de recherches metallurgiques destinees a mettre au point des combustibles nucleaires. (author) [Spanish] Para determinar el contenido de plutonio de los materiales nucleares existen diversos metodos. Si se trata de cantidades del orden del miligramo se pueden emplear la espectrofotometria diferencial por el color del Pu (III), la gravimetria basada en el PuO2{sub ,} si recuento gamma y metodos de oxidorreduccion como las valoraciones potenciometricas o amperimetricas y la culombiometria de potencial controlado. Si se trata de microgramos son preferibles el recuento alfa, la dilucion isotopica o las tecnicas polarograficas. Teniendo en cuenta que unos metodos son mas adecuados que otros para ciertos tipos de muestra, el analista tiene que resolver un dificil problema de seleccion a fin de obtener ios mejores resultados posibles. Los autores exponen las ventajas y las limitaciones puestas de manifiesto por los anos de experiencia en la A.E.R.E. y formulan observaciones acerca de la exactitud y la precision de los metodos, su sensibilidad y otras cuestiones de especial interes. Como algunos de esos metodos exigen la separacion previa del plutonio, los autores estudian el empleo de las tecnicas de intercambio anionico y de cromatografia en fase inversa, y en particular su conveniencia para el analisis de muestras radiactivas. Examinan los muchos problemas que han surgido al analizar por estos metodos, aleaciones, productos ceramicos y cermets de plutonio en diversos sistemas que contenian uranio, torio, hierro, cromo, molibdeno, cerio y cobalto. La memoria trata

  16. Indirect Determination of Half-Lives of Short-Lived Fission Gases Using a Gas Flow Method; Determination Indirecte des Courtes PeRiodes de Produits de Fission Gazeux, par une Methode a Courant Gazeux; 041a 041e 0421 0412 0415 041d 041d 041e 0415 041e 041f 0420 0415 0414 0415 041b 0415 041d 0418 0415 041f 0415 0420 0418 041e 0414 041e 0412 041f 041e 041b 0423 0420 0410 0421 041f 0410 0414 0410 041a 041e 0420 041e 0422 041a 041e 0416 0418 0412 0423 0429 0418 0425 0413 0410 0417 041e - 041e 0411 0420 0410 0417 041d 042b 0425 041f 0420 041e 0414 0423 041a 0422 041e 0412 0414 0415 041b 0415 041d 0418 042f 0421 0418 0421 041f 041e 041b 042c 0417 041e 0412 0410 041d 0418 0415 041c 041c 0415 0422 041e 0414 041e 0412 0413 0410 0417 041e 0412 041e 0413 041e 041f 041e 0422 041e 041a 0410 ; Determinacion Indirecta del T 1/2 de los Cases de Fision de Periodo Corto por un Metodo de Circulacion

    Energy Technology Data Exchange (ETDEWEB)

    Patzelt, P.; Herrmann, G. [Institut fuer Anorganische Chemie und Kernchemie der Universitaet Mainz, Mainz, Federal Republic of Germany (Germany)

    1965-07-15

    decroissance des pics gamma appropriees. Les chiffres indiques representent les valeurs moyennes d'un certain nombre d'experiences et resultent d'un mode de ponderation tel que W{sub i} Tilde-Operator 1/o{sup 2}. Tous les calculs ont ete effectues au centre d'ordinateurs de l'Universite de Mayence. (author) [Spanish] Dado que el estudio de la distribucion de las cafgas en la fision nuclear requiere la determinacion de los rendimientos primatios de los diferentes productos de fision, que por lo general son de periodo corto o derivan de precursores de periodo corto, es preciso poder llevar a cabo separaciones muy rapidas y eficaces de los eslabones contiguos de una cadena de fision. Aprovechando el poder de emanacion sumamente elevado de ciertos compuestos de uranio, se pueden practicar con gran facilidad separaciones de los gases en mas de una docena de cadenas de productos de fision. Pero el calculo de los rendimientos y del poder de emanacion efectivo de blancos en forma de capas gruesas pueden resultar considerablemente afectados por los datos relativos al periodo de los gases. En consecuencia, los autores han determinado con gran precision los periodos de los isotopos {sup 93}Kr y {sup 131}Xe a {sup 143}Xe aplicando un metodo basado en la velocidad de circulacion de estos gases, junto con una tecnica perfeccionada de carga de electrodos. Efectuaron mediciones basadas en la cantidad de productos activos de desintegracion de periodo largo depositada en los electrodos. La velocidad de circulacion, el tiempo de irradiacion y de enfriamiento, asi como los aparatos de recuento se escogieron de forma que facilitaba grandemente la medicion de cada uno de los productos descendientes. En algunos casos, fue indispensable, por razones de selectividad radioquimica, proceder a separaciones. Los resultados obtenidos son: {sup 89}Kr, 3.11 {+-} 0.06 min: {sup 90}Kr, 32.1 {+-} 0.8 s; {sup 91}Kr, 8.36 {+-} 0.15 s; {sup 92}Kr, 1,92 {+-} 0.07 s; {sup 93}Kr, 1.17 {+-} 0.04 s; {sup 137}Xe, 3

  17. Las cosas por su nombre

    OpenAIRE

    Storani, Emilia

    2017-01-01

    El artículo propone indagar sobre los modos y diferentes formatos que se utilizan tanto en la escritura como en la lectura, para articular con las luchas por la identidad de género. La Ley de Identidad de Género ha sido un puntapié clave para pensarnos a nosotros mismos culturalmente y para pensar a los demás. Pero, ¿cómo mencionamos, escribimos y leemos las diferentes identidades? La escritura, también es un mundo transformador para quienes bregan por una sociedad más libre y sin prejuicios....

  18. Ptose palpebral causada por Paquidermoperiostose

    Directory of Open Access Journals (Sweden)

    Patricia Regina de Pinho Tavares

    2014-08-01

    Full Text Available A paquidermoperiostose é uma síndrome caracterizada por acometimento cutâneo e ósseo, e em alguns casos ocorre comprometimento palpebral leve. É uma síndrome rara, idiopática ou hereditária, com provável herança autossômica dominante de penetrância variável. Descreve-se o caso de um paciente com ptose grave por paquidermoperiostose elucidando sua fisiopatologia e conduta cirúrgica aplicada.

  19. Diverticulitis yeyunal perforada por enterolito.

    OpenAIRE

    Marenco De la Cuadra, Beatriz; Gomez-Rosado, Juan-Carlos; Capitan-Morales, Luis-Cristobal; Valdés Hernández, Javier; Reyes-lopera, N.J. De los

    2012-01-01

    La diverticulosis yeyunal es una enfermedad adquirida rara. Casi el 60-70% keeps asymptomátic or Con síntomas crónicos inespecíficos, aunque puede presentarse como un abdomen agudo. La perforación debida a enterolitos es una causa extremadamente rara do complicación, y puede producirse por la impactación de ésta contra la pared intestinal. Presentamos caso de un varón de 82 años que acude a urgencias por un dolor súbito abdominal, difuso, con irritación peritoneal, leucocitosis con neutro...

  20. Mortalidad intrahospitalaria por accidente cerebrovascular

    OpenAIRE

    Federico Rodríguez Lucci; Virginia Pujol Lereis; Sebastián Ameriso; Guillermo Povedano; María F. Díaz; Alejandro Hlavnicka; Néstor A. Wainsztein; Sebastián F. Ameriso

    2013-01-01

    La mortalidad global por accidente cerebrovascular (ACV) ha disminuido en las últimas tres décadas, probablemente debido a un mejor control de los factores de riesgo vascular. La mortalidad hospitalaria por ACV ha sido tradicionalmente estimada entre 6 y 14% en la mayoría de las series comunicadas. Sin embargo, los datos de ensayos clínicos recientes sugieren que esta cifra sería sustancialmente menor. Se revisaron datos de pacientes internados con diagnóstico de ACV del Banco de Datos de Str...

  1. Disintegration-Rate Determination by 4 {pi} Counting; Determination du taux de desintegrations par comptage 4 {pi}; Opredelenie skorosti raspada pri pomotsi 4 {pi} schetchikov; Determinacion de la velocidad de desintegracion por recuento 4 {pi}

    Energy Technology Data Exchange (ETDEWEB)

    Pate, Brian D [Chemistry Department, Washington University, St. Louis, MO (United States)

    1960-06-15

    The history of the development of the 4 {pi} counting method is reviewed. The unique properties of the 4 {pi} counter system are described and the criteria are specified which place disintegration rate measurements, made with the system, on an absolute basis. The types of radioactive decay process to which the method is applicable are outlined, together with the various errors to which a given measurement is liable. Departure of response probability from unity, absorption of radiation in the source-mounting system, and source self-absorption are discussed in detail. (author) [French] L'auteur fait l'historique des progres de la methode de comptage 4 {pi}. Il decrit les proprietes remarquables du dispositif de comptage 4 {pi} et precise les conditions dans lesquelles les mesures du taux de desintegration se font avec ce dispositif sur une base absolue. Il donne un apercu des types de processus de desintegration radioactive, ainsi que de diverses erreurs auxquelles est sujette une mesure donnee. Il examine en detail le cas ou la probabilite de reponse s'ecarte de l'unite, l'absorption des rayonnements dans le support de la source et l'autoabsorption de la source. (author) [Spanish] En la memoria el autor expone el desarrollo del metodo de recuento 4 {pi}. Describe las caracteristicas particulares de este metodo y explica las razones por las que las mediciones de la velocidad de desintegracion efectuadas segun ese procedimiento tienen un caracter absoluto. Se indican, asimismo, los tipos de procesos de desintegracion radiactiva a los que se puede aplicar el metodo, asi como los diferentes defectos de que puede adolecer una medicion determinada. Tambien se estudia detenidamente el caso en que la probabilidad de respuesta no es igual a la unidad, la absorcion de radiaciones en el soporte de la fuente y la autoabsorcion de la misma. (author) [Russian] Daetsya obzor istorii razvitiya metoda scheta s pomoshch'yu 4 {pi} schetchikov. Privoditsya opisanie unikal'nykh svojstv

  2. Electronic methods for discriminating scintillation shapes; Methodes electroniques de discrimination des formes des impulsions issues de scintillateurs; Ehlektronnye metody diskriminatsii form stsintillyatsii; Metodos electronicos de discriminacion de forma de impulsos de centelleo

    Energy Technology Data Exchange (ETDEWEB)

    Forte, M; Konsta, A; Maranzana, C [European Atomic Energy Community, CCR, ISPRA (Italy)

    1962-04-15

    ne doit se faire qu'entre deux types d'impulsions seulement (neutrons et rayons gamma, par exemple), on a egalement envisage l'emploi de reseaux passifs qu'il serait possible d'ameliorer et de simplifier. Les auteurs ont fait l'essai de quelques reseaux; ils sont notamment parvenus, en presence d'un bruit de fond du a des rayons gamma, a realiser la discrimination dans des scintillateurs liquides de protons de recul ne delivrant que de faibles impulsions (quelques dizaines de photo-electrons) et celle de fragments de capture de neutrons dans des scintillateurs liquides contenant du bore. Certains de ces reseaux ont pu fonctionner avec des impulsions de meme polarite issues de deux des dernieres dynodes, et meme avec les impulsions de sortie delivrees par une seule electrode. Il y a la une possibilite interessante pour les cas ou il est indique d'utiliser l'anode separement, par exemple pour le cycle de synchronisation. (author) [Spanish] Como ya se ha senalado, la forma de los impulsos emitidos por un centelleador, que es caracteristica del tipo de particula excitante (electron, proton, particulas alfa, etc.), puede convertirse en una amplitud de impulso como parametro independiente. Ello permite determinar, utilizando un analizador multicanal, la composicion de un haz mixto de particulas que excite el centelleador. Este metodo se ha aplicado con exito empleando varios centelleadores de tipo organico e inorganico. Los autores describen con detalle las tecnicas electronicas utilizadas para convertir la forme de los impulsos. En el caso mas sencillo de discriminacion entre solo dos clases de impulsos (por ejemplo, discriminacion de neutrones y rayos gamma), se ha estudiado la conveniencia de utilizar redes pasivas, susceptibles de nuevos perfeccionamientos y simplificaciones. Se han ensayado varios tipos de redes y el principal resultado obtenido consiste en la discriminacion, en presencia de un fondo gamma, de los protones de retrocesco en centelleadores liquidos

  3. DESAJUSTE EDUCATIVO POR REGIONES EN COLOMBIA: ¿COMPETENCIA POR SALARIOS O POR PUESTOS DE TRABAJO?

    Directory of Open Access Journals (Sweden)

    Maribel Castillo Caicedo

    2007-06-01

    Full Text Available Este trabajo aporta una perspectiva del fenómeno de la sobreeducación, entendida como un desajuste por exceso, entre el nivel educativo alcanzado por el individuo y el exigido por el puesto de trabajo en el cual se desempeña; esto se debe a que existe una demanda laboral estrecha de puestos de trabajo para personas calificadas en Colombia. Se analizan las contribuciones empíricas existentes y el debate sobre las mismas; se examinan las teorías que permiten explicar la existencia de un desajuste educativo y se realiza una revisión de la literatura internacional y nacional sobre el tema. Adicionalmente, se plantean una serie de hipótesis para desarrollar un esquema que permita determinar el comportamiento del individuo en el fenómeno de la sobreeducación.

  4. The Application of Various Nondestructive Testing Methods to Fuel Elements of the Orgel Type; Application des Differentes Methodes d'Essais Non Destructifs aux Elements Combustibles du Type Orgel; Primenenie razlichnykh nedestruktivnykh metodov ispytanij k toplivnym ehlementam tipa ''orgel''; Aplicacion de Distintos Metodos de Ensayo No Destructivo a los Elementos Combustibles de Tipo Orgel

    Energy Technology Data Exchange (ETDEWEB)

    Bonnet, P.; Jansen, J. [EURATOM, C.C.R., Ispra (Italy)

    1965-09-15

    y externos empleando captadores neumaticos, y registro de los resultados. 2. Medicion de espesores empleando metodos de resonancia ultrasonica o bien rayos y (contrato Euratom- Istituto Sperimentale Metalli Leggeri). 3. Control de la flecha. 4. Ensayos con tubos de aletas. La deteccion de fallas en vainas lisas ha sido tambien objeto de trabajos y se ha adoptado un criterio de rechazo segun la finalidad a que las vainas se destinan. a) Se estudiara la creacion de defectos artificiales, en funcion de la nocividad de los defectos reales en el SAP. Los estudios preliminares han puesto de manifiesto una gran sensibilidad a los defectos longitudinales, creados generalmente al producirse la transformacion, y debidos a inclusiones de gran tamano. b) Ensayos con metodos ultrasonicos. Defectos longitudinales: Se compara el metodo de 2 captadores con el de un solo captador y se ponen de manifiesto las limitaciones inherentes a la utilizacion de cada uno de ellos. Defectos transversales: Se presenta una breve descripcion del metodo de captador unico aplicado a este problema. Arrastre mecanico: Se describe un banco mecanico tipo laboratorio para estudiar los criterios de ensayo y un banco de tipo semi-industrial para pasaje de los tubos e inspeccion continua de los mismos, con registro de los defectos. Se explican las dificultades con que se tropezo en su construccion y puesta a punto, y los medios empleados para superarlas. c) Ensayos radiograficos. Este metodo sera objeto de una memoria especial; se senalan aquf solamente los resultados obtenidos en tubos de fuerza o vainas. d) Ensayos diversos. Los ensayos finales con elementos combustibles completos pueden clasificarse en dos categorias: Bruebas de estanqueidad empleando helio, desarrolladas por la SOGEV. Un dispositivo permite inspeccionar al mismo tiempo 4 o 6 elementos combustibles, o bien 2 o 3 por separado. Ensayos radiograficos clasicos. Se hace hincapie en el estudio de las soldaduras y se establecen las condiciones

  5. Consanguinidad por isonimia en Salta

    Directory of Open Access Journals (Sweden)

    Albeza, María V.

    2007-01-01

    Full Text Available Se estimó el coeficiente de parentesco por isonimia para localidades de la Puna, Valle Calchaquí y Valle de Lerma, a fin de evaluar diferentes factores evolutivos que podrían estar afectando la composición genética de la población. A partir de los apellidos de las parejas consignadas en fuentes primarias de información, se estimó la isonimia conyugal o marital, el coeficiente total Ft y sus componentes Fr (inbreeding azaroso y Fn (inbreeding no azaroso. De las localidades estudiadas, en la Puna se ha detectado sólo una pareja isónima en una de ellas, en el Valle Calchaquí, tres y ninguna en el Valle de Lerma. Tanto en el Valle Calchaquí como en el de Lerma, se han estimado valores negativos de Ft, y en la Puna se registran los valores más elevados. En las localidades estudiadas no se cumple el supuesto de transmisión patrilineal de apellidos por lo que los valores de Fr y por ende de Ft podrían estar subestimados. Es por ello que sería necesario contar con información desde otras vertientes metodológicas para corroborar, complementar y manejar cuidadosamente el análisis de los datos y las conclusiones que se obtienen.

  6. Celulitis por citomegalovirus Cytomegalovirus cellulitis

    Directory of Open Access Journals (Sweden)

    A. Ruiz Lascano

    2002-12-01

    Full Text Available Las lesiones cutáneas por citomegalovirus (CMV son infrecuentes y a menudo una manifestación tardía de una enfermedad sistémica, que generalmente anuncia un curso fatal. Comunicamos un caso de celulitis por CMV: una mujer de 70 años con trasplante renal efectuado 1 mes antes de la consulta, terapia inmunosupresora con ciclosporina A y metilprednisona. La paciente ingresó por fiebre, dolor e impotencia funcional en pierna derecha. Comprobamos la existencia de una placa de 8 por 4 cm eritematoedematosa. La tratamos con antibióticos sin mejoría, por lo que realizamos un estudio histopatológico de piel que mostró cambios citopáticos compatibles con infección por CMV. Los cultivos bacteriológicos y micológicos fueron negativos. La inmunohistoquímica específica para CMV y el estudio de reacción en cadena de la polimerasa (PCR de la biopsia de piel fueron positivas, al igual que la antigenemia. El tratamiento con ganciclovir produjo la mejoría del cuadro clínico. En la literatura revisada no hemos encontrado la celulitis como manifestación de enfermedad cutánea por CMV.Cutaneous lesions in CMV infection are rare, often a late manifestation of systemic infection, and usually herald a fatal course. A 70 year-old woman received a kidney transplantation one month before consulting and immunosuppressive therapy that included cyclosporine A and methylprednisone. She complained of fever, local pain in her right leg, and an erythematous and swelling plaque. She was treated with intravenous antibiotics without improvement. A skin biopsy was performed and the tissue obtained was sent for bacterial and fungal cultures as well as for histological examination. Cultures were negative. The biopsy showed CMV cytopathic changes. Immunoperoxidase staining was positive for CMV and polymerase chain reaction (PCR testing revealed CMV DNA. She was treated with ganciclovir with resolution of the lesion. CMV cellulitis is a rare cutaneous manifestation

  7. Development of an analytic method for arsenic's determination in lime and tortilla; Desarrollo de un metodo analitico para determinacion de arsenico en cal y tortilla

    Energy Technology Data Exchange (ETDEWEB)

    Huato Soberanis, Julio; Ogura, Tetsuya [Universidad Autonoma de Guadalajara, Guadalajara, Jalisco (Mexico)

    1995-02-01

    A spectrophotometric method to determine As in tortilla and lime has been optimized, modifying the AsH{sub 3} generator. The reaction between arsin (AsH{sub 3}){sub 4} and diethyldithiocarbamate of Ag (AgDDC); was followed spectrophotometrically. The conditions under which the As remains in the ash during the calcination of the tortillas were studied. It was found that when they were heated in a quartz tube with a careful control of the air flow and oxygen, as well as the heating temperature, the arsenic loss in minimized. [Spanish] Se ha optimizado el metodo para determinar As en la tortilla y cal mediante espectrometria en el visible del color producido en la reaccion entre Arsina (AsH{sub 3}){sub 4} y dietilditiocarbamato de plata (AgDDC); modificando el generador de AsH{sub 3}. Se han buscado las condiciones en las que el arsenico permanece en las cenizas de la calcinacion de las tortillas; encontrandose que las tortillas deben calentarse en un tubo de cuarzo con control del flujo de aire y oxigeno asi como de la temperatura de calentamiento.

  8. Assessment of the synthesis conditions for nano-Bi{sub 4}Ti{sub 3}O{sub 12} production by the combustion route; Avaliacao das condicoes de sintese para producao de nano-Bi{sub 4}Ti{sub 3}O{sub 12} pelo metodo de combustao

    Energy Technology Data Exchange (ETDEWEB)

    Dias, Jeferson A.; Nascimento, Cassia C.; Oliveira, Jessica A.; Morelli, Marcio R., E-mail: jeferson.unifal@gmail.com [Universidade Federal de Sao Carlos (UFSCar), SP (Brazil)

    2016-07-01

    The bismuth titanate has interesting optoelectronic properties. Its production in nanometric scale is important due to the demand of miniaturized electronic devices and greater synthesization facility. This study aims at the evaluation of synthesis parameters for nano-Bi{sub 4}Ti{sub 3}O{sub 12} production by the combustion route. For that, the materials were synthesized and calcined at 600°C, 700°C and 800°C. The materials were posteriorly characterized by X-Ray diffraction, SEM, DSC-TGA, FTIR; DRS and impedance spectroscopy. The results have demonstrated that the combustion method was effective for nanocrystalline powders production, which also showed high levels of purity. Particles size growth was observed for high treatment temperatures. Low level of residual organic matter was determined and the high electrical resistivity was observed. The temperature of 600°C was enough to produce particles with optimal properties. Therefore, the results have confirmed the efficacy of combustion route to produce nanometric Bi{sub 4}Ti{sub 3}O{sub 12}. (author)

  9. Recent Radiochemical Procedures for Bio-Assay Studies at Trombay; Methodes Radiochimiques d'Analyse Biologique Employees a Trombay; Nedavno razrabotannye v trombee radiokhimicheskie metody dlya biologicheskikh issledovanij; Regientes Metodos Radioquimicos Aplicados al Analisis Biologico en Trombay

    Energy Technology Data Exchange (ETDEWEB)

    Kamath, P. R.; Bhat, I. S.; Rudran, Kamala; Iyengar, M. A.R.; Koshy, Elizabeth; Waingankar, Urmila S.; Khanolkar, Vasanti S. [Health Physics Division, Atomic Energy Establishment Trombay, Bombay (India)

    1964-10-15

    travaux accomplis au laboratoire d'analyses biologiques depuis 1958. (author) [Spanish] El laboratorio de analisis biologicos de Trombay efectua anualmente cerca de dos mil analisis de orina para determinar diferentes radionuclidos, siendo los isotopos de mayor interes el {sup 232}Th, {sup 228}Th, {sup 226}Ra, {sup 224}Ra, {sup 228}Ra, U natural, productos de fision y {sup 239}Pu, asip como el {sup 60}Co, {sup 32}P, {sup 131}I, {sup 32}P, {sup 137}Cs, {sup 3}H, {sup 90}Sr, etc. El analisis rapido de un gran numero de muestras de baja actividad exige el perfeccionamiento de tecnicas especiales, sobre todo cuando se desea un alto grado de especificidad, unido a un elevado rendimiento. La' orina presenta una matriz muy complicada, con una elevada proporcion de sustancias organicas complejantes y contenido variable de sales. Los procedimientos de calcinacion por via humeda exigen un tiempo considerable y resultan engorrosos cuando se han de destruir muestras de aproximadamente 1 a 1,5 l. El trabajo deseribe algunos metodos recientemente desarrollados en el laboratorio de los autores y proporciona detalles de estudios sobre indicadores que han intervenido en el desarrollo de aquellos metodos. Radio-228: Se mide el mesotorio contenido en la orina despues de separar el {sup 228}Ac en equilibrio radiactivo. El radio presente en la orina se coprecipita con BaSO{sub 4}, teniendose en cuenta que sigue formandose {sup 228}Ac. El precipitado se disuelve en acido perclorico despues de anadir como portadores Pb, Bi y La. Los sulfatos insolubles se precipitan con H{sub 2}SO{sub 4} diluido y el {sup 228}Ac que permanece en solucion, despues de ser arrastrado con F{sub 3}La, se somete a recuento de actividad beta y se comprueba la disminucion de actividad. La cantidad de {sup 228}Ra se calcula a partir de la actividad observada en el {sup 228}Ac despues de introducir la oportuna correccion para tener en cuenta la desintegracion y el rendimiento de la recuperacion quimica. Torio: El trabajo

  10. Esporotricosis diagnosticada por el laboratorio

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    Nelly Ordóñez

    1989-06-01

    Full Text Available De 1976 a 1989 se han diagnosticado 40 casos de esporotricosis en el laboratorio de Micología del Instituto Nacional de Salud. La enfermedad se presentó en pacientes entre 4 y 52 años y tuvo predilección por el sexo masculino: 35 de 40 (87,5%; las formas clínicas más frecuentes fueron la cutánea fija, 18 de 40 (45%, y la linfocutánea, 17 de 40 (42,5%, con localización mayor en miembros superiores, 18 de 40 (45%. El diagnóstico se estableció por el aislamiento del Sporothrix schenckii en 35 de 38 pacientes (92%; los otros dos pacientes se diagnosticaron empleando otras técnicas: inmunofluorescencia directa, intradermorreacción y aglutinación en tubo.

  11. Miasis cutanea por cordylobia anthropophaga

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    Alkorta Gurrutxaga Miriam

    2001-01-01

    Full Text Available El incremento progresivo en el número de personas que viajan a países tropicales ha hecho que las enfermedades importadas adquieran una relevancia cada vez mayor. Las miasis (o infestaciones por larvas de moscas cutáneas se encuentran entre este tipo de enfermedades siendo especialmente frecuentes en países tropicales. A propósito de la observación de un caso de miasis cutánea masiva por Cordylobia antropophaga, que ocurrió en una mujer de 34 años de edad al volver de un viaje a Senegal, se ha efectuado una revisión de los casos de miasis cutáneas forunculoides importadas publicados en España, así como de la biología, patología, tratamiento y prevención de la miasis humana por Cordylobia anthropophaga. El caso referido, se caracterizó por la infestación con un número inusualmente elevado de larvas, no sospechándose su etiología hasta la fase final de la enfermedad. La emergencia continuada de larvas (se recogieron 91 generó en la paciente un estado de ansiedad importante. Finalmente, la eliminación de las larvas provocó una rápida mejoría de la paciente. Aunque los casos de miasis cutánea no tienen la gravedad de otras enfermedades importadas, su conocimiento es necesario desde el punto de vista preventivo, diagnóstico y terapeútico. Es importante proceder a la identificación morfológica de las larvas diferenciándolas de otro tipo de miasis con implicaciones terapéuticas diferentes.

  12. Sintese fotoquimica de polipirrol em membranas microporosas de PVDF : um novo metodo para obter compositos condutores eletricos

    OpenAIRE

    Ruth Marlene Campomanes Santana

    1995-01-01

    Resumo: Este trabalho descreve em linhas gerais um novo método de obter compósitos condutores de polipirrol (PPy)/Poli(fluoreto de vinilideno) (PVDF), polimerização via luz UV induzida em presença de um adequado fotogerador de ácido (PAG), compostos tais como os sais de Ferro-areno e Trifenil sulfônio ou compostos geradores orgânicos tal como a triazina clorinada. Estudos Gravimétricos confirmados por Análise Termogravimé-trico (TGA), tem mostrado que o rendimento da polimerização insidente n...

  13. Abdome agudo por obstrução por ileobiliar

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    Márcia Cristina de Alencastro

    Full Text Available OBJETIVO: descrever a experiência na abordagem dos doentes com abdome agudo por obstrução por IB, desde o diagnóstico até o tratamento definitivo. MÉTODOS: estudo retrospectivo incluindo todos os casos de IB tratados em um período de 23 anos. De acordo com a abordagem cirúrgica realizada, os pacientes foram divididos em dois grupos (1 enterolitotomia com colecistectomia no segundo momento; e (2 enterolitotomia, colecistectomia e abordagem da fístula. RESULTADOS: Doze pacientes foram incluídos, sendo 11 mulheres (91,6%, com média de idade de 72,2 anos. Todos os pacientes apresentavam doenças associadas, principalmente hipertensão arterial sistêmica (75%. Dois pacientes não apresentavam sintomas significativos de obstrução intestinal. O diagnóstico de IB foi realizado em seis pacientes (50% antes da laparotomia. O grupo 1 foi constituído de oito pacientes e o grupo 2 de quatro, e a morbidade foi, respectivamente, 33,3% e 8,3%. A mortalidade foi 16,6% (um paciente de cada grupo. CONCLUSÃO: O manejo do IB deve ser individualizado. O tratamento da obstrução mediante remoção do cálculo biliar por enterotomia proximal é a escolha inicial para o tratamento do IB. A colecistectomia e a correção da fístula bilioentérica podem ser realizadas juntamente com a remoção do cálculo, no entanto, em pacientes com comorbidades significativas, esses procedimentos devem ser realizados posteriormente.

  14. The Comparative Accuracy of the 4 {pi} Liquid Scintillation Counting Method of Radioisotope Standardization; L'exactitude comparee de la methode de comptage 4 {pi} a scintillateurs liquides pour l'etalonnage des radioisotopes; Sravnitel'naya tochnost' 4 {pi} zhidkogo stsintillatsionnogo metoda podscheta standartiziruemykh radioizotopov; Exactitud del metodo de recuento con centelleador liquido 4 {pi} para normalizar radioisotopos, comparada con la de otros metodos

    Energy Technology Data Exchange (ETDEWEB)

    Steyn, J [National Physical Research Laboratory, Pretoria (South Africa)

    1960-06-15

    The accuracy of the 4 {pi} liquid scintillation counting method of standardizing {beta} emitters was compared to 4 l{pi} {beta}-{gamma} coincidence counting for the nuclides Co{sup 60}, I{sup 131} and Au{sup 198}. For P{sup 32} the liquid counting results were compared to 4 {pi} proportional counting. The efficiency of the liquid scintillation counting method was found to be energy dependent, dropping to about 97.5% for Co{sup 60} which was the lowest energy {beta} emitter investigated. (author) [French] La precision de la methode de comptage 4 {pi} a scintillateurs liquides pour l'etalonnage des emetteurs {beta} a ete comparee au comptage par coincidences 4 {pi} {beta}-{gamma} pour le So{sup 60}, le I{sup 131} et le Au{sup 198}. Dans le cas du P{sup 32}, les resultats du comptage au liquide ont ete compares a ceux du comptage 4 {pi} proportionnel. On a constate que le rendement de la methode de comptage a scintillateurs liquides variait en fonction de l'energie emise et qu'il descendait a environ 97.5% pour le Co{sup 60} qui, de tous les emetteurs {beta} etudies, emet l'energie la plus faible. (author) [Spanish] El autor compara la precision del metodo de recuento con centelleador iquido 4 {pi} para normalizar emisores {beta} con la del metodo de coincidencias {beta}-{gamma} 4 {pi}, para los siguientes nuclidos: So{sup 60}, I{sup 131} y Au{sup 198}. En el caso del P{sup 32}, confronta los resultados del primer metodo con los obtenidos mediante el recuento proporcional 4 {pi}. Comprueba que la eficacia del metodo de recuento con centelleador liquido depende de la energia y desciende al 97.5%, aproximadamente, para el Co{sup 60}, que fue el emisor {beta} mas debil que se investigo. (author) [Russian] Tochnost' 4 {pi} zhidkogo stsintillyatsionnog o metoda podscheta standartiziruemogo {beta}-izluchatelya sravnivalas' s 4 {pi} {beta}-{gamma} metodom podscheta na sovpadeniyakh dlya izotopov So{sup 60}, I{sup 131} i Au{sup 198}. Dlya R{sup 32} rezultaty zhidkogo

  15. Desajuste educativo por regiones en Colombia: ¿competencia por salarios o por puestos de trabajo?

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    Castillo Caicedo Maribel

    2007-08-01

    Full Text Available Este trabajo aporta una perspectiva del fenómeno de la sobreeducación,
    entendida como un desajuste por exceso, entre el nivel educativo alcanzado
    por el individuo y el exigido por el puesto de trabajo en el cual se
    desempeña; esto se debe a que existe una demanda laboral estrecha de
    puestos de trabajo para personas calificadas en Colombia. Se analizan las
    contribuciones empíricas existentes y el debate sobre las mismas; se
    examinan las teorías que permiten explicar la existencia de un desajuste
    educativo y se realiza una revisión de la literatura internacional y
    nacional sobre el tema. Adicionalmente, se plantean una serie de hipótesis
    para desarrollar un esquema que permita determinar el comportamiento
    del individuo en el fenómeno de la sobreeducación.

  16. Muerte materna por malaria grave por Plasmodium vivax

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    Nancy Arróspide

    Full Text Available Se presenta el caso de una mujer de 19 años con 29 semanas de gestación, procedente de Llumpe (Ancash con antecedentes de viajes a las localidades de Chanchamayo (Junín y Rinconada (Ancash. Ingresó al Hospital de Chacas (Ancash por presentar mal estado general, deshidratación, dificultad respiratoria, ictericia, sensación de alza térmica y dolor abdominal, tuvo reporte de: hemoparásitos 60% en frotis sanguíneo. Fue transferida al Hospital Ramos Guardia (Huaraz donde presentó mayor dificultad respiratoria, coluria, hematuria, disminución del débito urinario y reporte de Plasmodium (+, luego fue transferida al Hospital Cayetano Heredia (Lima donde ingresó a la Unidad de Cuidados Intensivos (UCI, con evolución a falla multiorgánica, óbito fetal y muerte materna. Se confirmó infección por Plasmodium vivax. Destacamos la importancia de mejorar nuestras capacidades de diagnóstico y manejo para brindar un tratamiento adecuado y oportuno.

  17. Determinação e padronização da vitamina E e seus isomeros : comparação entre o metodo de cromatografia liquida de alta eficiencia (CLAE) e o metodo espectrofotometrico por redução de ions cupricos

    OpenAIRE

    Andrea Scabora Boix Caro

    2002-01-01

    Resumo: A presente Tese visou estudar a determinação da vitamina E, estabelecendo uma comparação entre o método clássico modificado com um outro método de determinação, a cromatografia líquida de alta eficiência (CLAE).Para efeito de comparação foram utilizados cinco tipos de amostras diferentes: suplementos vitamínicos, óleos vegetais, DDOS, farinha de germe de trigo e fígados liofilizados de ratos. Os resultados encontrados nos métodos avaliados diferiram quanto ao tipo de isômero encontrad...

  18. Blind method of clustering for the evaluation of the dose received by personnel in two methods of administration of radiopharmaceuticals; Metodo ciego de clusterizacion para la evaluacion de la dosis recibida por el personal en dos metodos de administracion de radioformacos

    Energy Technology Data Exchange (ETDEWEB)

    VerdeVelasco, J. M.; Gonzalez Gonzalez, M.; Montes Fuentes, C.; Verde Velasco, J.; Gonzalez Blanco, F. J.; Ramos Pacho, J. A.

    2013-07-01

    The difficulty for the injection of drugs marked with radioactive isotopes while syringe is located within the lead protector does that in many cases staff do it chooses to use the syringe outside the lead protector, increasing therefore the dose of radiation received. In our service raises the possibility of using a different methodology, channeling a pathway through a catheter, which allows administer, in all cases, with the syringe within the lead guard. We will check if significant differences can be seen both in the dose absorbed by the staff as in the time it takes to perform the administration of the drug using the method proposed compared injection without guard. (Author)

  19. Non-Destructive Testing Methods Applied to Multi-Finned SAP Tubing for Nuclear-Fuel Elements; Essais Non Destructifs de Gaines a Ailettes, en Poudre d'Aluminium Frittee, pour Elements Combustibles; Nedestruktivnye metody ispytaniya rebristykh trub iz spechennogo alyuminikiog'o poroshka dlya yadernykh toplivnykh ehlementov; Metodos de Ensayo No Destructivo Aplicados a Tubos de SAP con Aletas Multiples Destinados a Elementos Combustibles

    Energy Technology Data Exchange (ETDEWEB)

    Lund, S. A. [Danish Central Welding Institution, Copenhagen (Denmark); Knudsen, P. [Danish Atomic Energy Commission, Research Establishment, Risoe (Denmark)

    1965-09-15

    Energia Atomica de Dinamarca ha emprendido el estudio de un reactor de potencia con refrigerante organico y moderador de agua pesada. Los correspondientes elementos combustibles consisten en haces de 19 barras formadas por pastillas de dioxido de uranio sinterizado, encerradas en tubos de producto de aluminio sinterizado (SAP), de 2 m de longitud, provistos de aletas helicoidales. Para obtener condiciones optimas de transmision de calor y mantener la integridad del elemento combustible durante el funcionamiento del reactor, es necesario contar con tubos de muy alta calidad. Se citan dos ejemplos que ponen de manifiesto las estrechas tolerancias dimensionales adoptadas. Para asegurar una calidad adecuada de los tubos, se establecio un control de calidad muy estricto, basado en gran medida en la aplicacion de metodos no destructivos. Se describen en esta memoria las tecnicas desarrolladas para medir el espesor de pared y los diametros, y para descubrir defectos. La compleja seccion transversal, con 24 aletas, impide aplicar metodos ultrasonicos o de comentes de Foucault para medir el espesor de la pared. Por consiguiente, se desarrollo un calibre registrador de rayos beta, cuyo funcionamiento se basa en la atenuacion sufrida por la radiacion beta proveniente de una fuente de {sup 90}Sr colocada en el interior del tubo. Para el registro continuo del espesor de la pared del tubo con seccion transversal mas simple, de 12 aletas, se utiliza un metodo ultrasonico de resonancia por inmersion. Los diametros interno y externo (entre puntos de aletas) se registran de manera continua mediante calibres neumaticos rapidos. Las fallas se detectan mediante la tecnica de eco de impulsos ultrasonicos, y examinando los tubos con corrientes de Foucault. El metodo ultrasonico permite descubrir facilmente las fisuras transversales, pero hasta ahora ha sido imposible utilizarlo para la deteccion de defectos longitudinales. Por consiguiente, ademas del ensayo ultrasonico, se aplica el examen con

  20. Miasis ocular por Oestrus ovis

    Directory of Open Access Journals (Sweden)

    María Beltrán F

    2006-01-01

    Full Text Available Se presentan tres casos de miasis ocular (dos adultos y un niñoprocedentes de zonas ganaderas de la provincia de Huaura,departamento de Lima,que acudieron al Hospital Regional de Huacho por presentar el ojo rojo,fotofobia, edema palpebral y sensación de cuerpo extraño;se extrajeron larvas adheridas al canto interno del ojo,las cuales se recibieron en el Instituto Nacional de Salud y fueron identificadas como Oestrus ovis .

  1. Data Evaluation Problems in the Pulsed Neutron Source Method; Problemes d'Evaluation des Donnees dans les Applications de la Methode de la Source Pulsee; Problemy otsenki dannykh pri primenenii metoda istochnika impul'snykh nejtronov; Problemas de Evaluacion de Datos en el Metodo de la Fuente de Neutrones Pulsados

    Energy Technology Data Exchange (ETDEWEB)

    Pal, L.; Bod, L.; Szatmary, Z. [Central Research Institute for Physics, Hungarian Academy of Sciences, Budapest (Hungary)

    1965-08-15

    moyen de transport dans de nombreuses matieres hydrogenees. (author) [Spanish] Desde hace mas de diez anos se viene empleando el metodo de los neutrones pulsados para determinar los parametros de difusion de los neutrones termicos. Este metodo ha resultado especialmente idoneo para el estudio de los moderadores hidrogenados. Los autores dan los resultados de las mediciones hechas en agua, benceno, tolueno, xileno, ciclohexano, n-hexano y difenilo, y examinan los metodos para evaluar con el minimo error los parametros de difusion de interes partiendo de los datos obtenidos en las mediciones. Se examina detenidamente, tanto en el plano teorico como en el experimental, el efecto de tiempo de vuelo que se manifiesta por razones tecnicas cuando se investigan moderadores a elevadas temperaturas, y que influye en el valor de la constante de desintegracion, y se exponen las condiciones geometricas en que se ha de operar para obtener resultados satisfactorios. Los autores determinan tambien el efecto que sobre la constante de desintegracion ejerce el tiempo muerto del detector neutronico y del amplificador, y demuestran que es despreciable cuando [i(t) {tau}]{sup 2} << 1, siendo i/t/dt el numero de neutrones detectados en el intervalo de tiempo/t, t + dt/, y {tau} el tiempo muerto. Se evaluo la constante de desintegracion empleando el metodo de la maxima probabilidad. Para determinar inequivocamente la funcion de probabilidad, se eligio un analizador multicanal que acumulaba como maximo una sola senal por ciclo de analisis y por canal. Se comprobo que la incorporacion del parametro caracteristico del fondo a la funcion de probabilidad tiene primordial importancia. Los parametros de la funcion de maxima probabilidad se evaluaron en una calculadora aplicando el metodo de iteracion de Newton. Cuando no se tiene debidamente en cuenta el fondo, este puede causar una mayor contaminacion aparente de armonicos, la cual, a su vez, puede interpretarse como un fondo aparente. Por ello es

  2. Modificação do metodo "kindling" para obtenção de status epilepticus experimental em ratos

    Directory of Open Access Journals (Sweden)

    Carlos J. Reis de Campos

    1980-03-01

    Full Text Available Foi utilizada em nova espécie animal (ratos, uma modificação do método "kindling", introduzida por Taber e col. (1977 para obtenção de status epilepticus experimental. Para isso foram implantados mediante cirurgia estereotáxica, eletrodos duplos, torcidos no hipocampo dorsal de 12 ratos machos albinos. Esses animais foram submetidos, após uma semana de pós-operatório, a 1 segundo de estimulação elétrica de baixa intensidade em forma intermitente, um estímulo por minuto durante 2 horas, desenvolvendo-se em prazo de 30 minutos um estado de epilepsia eletrográfica e comportamental duradoura. Vários padrões de descargas epilépticas eletrográficas foram observados bem como manifestações convulsivas tônico-clônicas. Os animais que foram submetidos a novas sessões de estimulação após 7 e 14 dias mostraram aumento de atividade epiléptica demonstrando uma modificação plástica do hipocampo do rato submetido a estimulação elétrica a qual perdura no tempo. O método permite a obtenção de "kindling" em tempo bem mais curto (horas, comparativamente às técnicas anteriormente descritas (dias, tornando-se um promissor modelo de epilepsia para testes de drogas anticonvulsivantes e para o estudo dos mecanismos fisiopatológicos e bioquímicos envolvidos na descarga epiléptica.

  3. Hipoglucemia inducida por carcinoma adrenal

    Directory of Open Access Journals (Sweden)

    Jimena Soutelo

    2013-08-01

    Full Text Available El carcinoma suprarrenal es una neoplasia maligna infrecuente y de mal pronóstico. La presentación clínica más común es originada por la producción hormonal excesiva, mientras que el desarrollo de hipoglucemia sintomática es excepcional. Presentamos el caso de una mujer de 37 años que ingresó al hospital por síntomas de hipoglucemias graves, hipertensión arterial, hipopotasemia y amenorrea secundaria. En el laboratorio se halló hipoglucemia con insulina inhibida y niveles de andrógenos en rango tumoral. La tomografía computarizada (TC de abdomen y pelvis mostró voluminosa formación heterogénea de aspecto sólido sin plano de clivaje con respecto al parénquima hepático e intenso realce con contraste. Luego de la extirpación de la masa retroperitoneal, evolucionó con valores de glucemia y potasemia normales, estabilizó la presión arterial y recuperó los ciclos menstruales.

  4. La curiosidad por la naturaleza

    Directory of Open Access Journals (Sweden)

    José Vicente Rodríguez

    2016-07-01

    Full Text Available Esta actitud es un instrumento estratégico para estimular procesos de desarrollo realmente sostenibles, donde se aproveche la admiración que nos embarga al conocer y apreciar lo que nos rodea para responsablemente utilizar y conservar nuestros recursos naturales. Con esta reflexión deseo resaltar esa motivación de escudriñar lo desconocido, que fue también la virtud que propició el desarrollo de la personalidad de Francisco José de Caldas y Tenorio, uno de nuestros primeros y connotados sabios colombianos, y en cuyo honor se constituyó la revista de divulgación científica más importante del país, que en estos momentos cumple 76 años de existencia. Caldas tuvo curiosidad por todo lo que existía en su entorno; inicialmente en su natal Popayán, donde se maravilló por lo natural, lo que lo motivó y llevó más allá de su tierra a formar parte de la mayor empresa de exploración científica adelantada en ese entonces en territorio americano: la primera Expedición Botánica al nuevo Reino de Granada, de José Celestino Mutis.

  5. Mortalidad por meningitis por Pasteurella canis. Oportunidades de aprendizaje

    Directory of Open Access Journals (Sweden)

    Ana Rosa Ropero Vera

    2016-01-01

    Full Text Available La meningitis bacteriana es una enfermedad importante de distribución mundial, causa mayor y sustancial de mortalidad y morbilidad en países en desarrollo. La Organización Mundial de la Salud (OMS sostiene que la meningitis es una de las diez afecciones principales del ser humano y debe ser considerada como una emergencia infectológica; por eso es fundamental reconocer que esta enfermedad es causa de muerte en niños de todo el mundo, sin distinción de raza, nivel económico o sociocultural. Se realizó una investigación de caso en menor de 53 días de nacido, que cumplía con los criterios clínicos y de laboratorio compatible con meningitis bacteriana, con el propósito de analizar y fortalecer la toma de decisiones en salud pública por parte de la secretaría local de salud del municipio de Valledupar (Colombia. Entre los hallazgos se encontró antecedentes infecciosos en el menor, coloración de Gram y cultivo de LCR, en el que se identificó cocobacilos Gram negativos, que fueron aislados como agente causal Pasteurella canis. Este estudio pretende sensibilizar a los prestadores de salud para que cuenten con personal altamente capacitado para brindar tratamientos adecuados y prevenir complicaciones en la meningitis bacteriana en niños, y así disminuir la posibilidad de secuelas o muerte, tanto en pacientes con compromiso inmunológico o sin este.

  6. Pressure surges generated by the polling out of pumping equipment in conduction by pressure. Application of a real case; Transitorios hidraulicos generados por arranque de equipos de bombeo en conducciones a presion. Aplicacion a un caso real

    Energy Technology Data Exchange (ETDEWEB)

    Carmona-Perales, L. G.; Carmona-Perales, R. B. [Universidad Nacional Autonoma de Mexico, Mexico, D.F. (Mexico)

    2000-12-01

    Water closed conduits are commonly designed with special attention paid to pressure surges due to pumping failures. In some particular cases, such at the Rio Yaque-Guaymas water pipeline system, pressure surges due to pumping start up are as high and dangerous as those produced by pumping failures. New subroutines were thus developed and included in the Closed Conduit Flow Transient Model developed by the Instituto de Ingenieria of the Universidad Nacional Autonoma de Mexico. This paper presents the mathematical model and its numerical solution using the Method of Characteristics and the Newton-Raphson Method. With the new modelling system it is possible to evaluate the pressure fluctuation time series due to start up at any pumping system. Using this new system a reliable explanation of bursts at the Rio Yaqui-Guaymas pipeline system could be set forth. [Spanish] Al disenar conducciones a presion, es comun que se presente especial atencion a los transitorios hidraulicos generados por paros de emergencia de los equipos de bombeo. En el acueducto rio Yaqui-Guaymas, Sonora, Mexico, los transitorios generados al poner en marcha los equipos de bombeo son tan importantes como los productos por disparo de bombas. En el Instituto de Ingenieria de la UNAM, se desarrollo e implanto en un programa de simulacion de transitorios hidraulicos en tuberias a presion una subrutina para simular el arranque de equipos de bombeo. El modelo matematico esta formado por el conjunto de ecuaciones dinamica y de continuidad, asi como la condicion de frontera que describe el arranque de las bombas. Se rescriben las ecuaciones dinamicas y de continuidad, con el metodo de las caracteristicas y se plantea un sistema de ecuaciones no lineales, el cual se resuelve con el metodo de Newton-Raphson. La simulacion del arranque de las bombas del acueducto en estudio, arroja valores de las cargas piezom ricas maximas y minimas mayores que la resistencia de la tuberia y menores que la topografia del

  7. Seroprevalencia de rubeola en Colombia: un analisis por cohorte de nacimiento

    Directory of Open Access Journals (Sweden)

    Doracelly Hincapie-Palacio

    2013-12-01

    Full Text Available OBJETIVO : Estimar la seroprevalencia de rubéola y factores asociados. METODOS : Estudio de seroprevalencia poblacional con una muestra aleatoria de 2.124 individuos de seis a 64 años, representativa por edad, sexo y área en Medellín, Colombia, 2009. Se analizó la asociación de variables biológicas y socioeconómicas con la seroprotección para rubéola, según la cohorte del año de nacimiento antes (1954 a 1990 y después (1991 a 2003 del inicio de la vacunación universal. Se determinaron los títulos de IgG con pruebas de alta sensibilidad (AxSYM ® Rubella IgG – Laboratorio Abbott y especificidad (VIDAS RUB IgG II ® – Laboratorio BioMerieux. Se estimaron proporciones y promedios ponderados derivados de un muestreo complejo incluyendo un factor de corrección por las diferencias en la participación por sexo. Se analizó la asociación de la protección por grupos de variables biológicas y sociales con un modelo de regresión logística, según la cohorte de nacimiento. RESULTADOS : Los títulos promedio de IgG fueron más altos en los nacidos antes del inicio de la vacunación (media 110 UI/ml; IC95% 100,5;120,2 que en los nacidos después (media 64 UI/ml; IC95% 54,4;72,8, p = 0,000. La proporción de protección fue creciente de 88,9% en los nacidos en 1990-1994, de 89,2% en 1995-1999 y de 92,1% en 2000 a 2003, posiblemente relacionado con la administración del refuerzo desde 1998. En los nacidos antes del inicio de la vacunación, la seroprotección estuvo asociada con el antecedente de contacto con casos (RD 2,6; IC95% 1,1;5,9, el estado de salud (RD 2,5; IC95% 1,05;6,0, el nivel de escolaridad (RD 0,2; IC95% 0,08;0,8 y los años de residencia del hogar en el barrio (RD 0,96; IC95% 0,98;1,0, luego de ajustar por todas las variables. En los nacidos después se asoció con el tiempo de sueño efectivo (RD 1,4; IC95%1,09;1,8 y el estado de salud (RD 5,5; IC95%1,2;23,8. CONCLUSIONES : La vacunación masiva generó un cambio en

  8. Automatic Inspection of Co-Laminated Elements; Controle Automatique d'Elements Colamines; Avtomaticheskij kontrol' ul'trazvukom sovmestno prokatannykh ehlementov; Metodo para la Verificacion Automatica de Elementos Colaminados

    Energy Technology Data Exchange (ETDEWEB)

    Destribats, Marie-Therese [Centre d' Etudes Nucleaires de Saclay (France); Dory, J. [Realisations Ultrasoniques Meaux (S. et M.) (France)

    1965-09-15

    'un disque rotatif. Chaque traducteur est mis en service tous les 1/6 de tour par l'intermediaire de relais commandes par des secteurs aimantes. De la sorte, le pinceau ultrasonore decrit sur la surface de la plaque une serie d'arcs de cercle jointifs. La quantite d'energie transmise a travers la plaque est mesuree avec precision en chaque point. Le resultat de la mesure est applique a un enregistreur special qui donne une reproduction en vraie grandeur de l'element examine (le papier de l'enregistreur est de type ordinaire; l'inscription s'effectue au moyen de papier carbone). Sur l'enregistrement obtenu, les defauts apparaissent sous forme de taches foncees. L'appareillage peut fonctionner, soit en tout ou rien avec un seuil de marquage predetermine, soit en demi-teintes. Les traducteurs, dont la frequence peut varier de 3 a 15 MHz, sont excites par des impulsions breves. Les traducteurs utilisies, en titanate de baryum, ont un diametre de 3 mm. Le pas d'exploration est variable de 0,3 a 0,6 mm, la vitesse lineaire etant de 5 a 20 mm par seconde. L'ensemble peut recevoir des elements ayant les dimensions maximales suivantes: largeur 150 mm, longueur 2000 mm, epaisseur 25 mm. Les essais effectues jusqu'a ce jour ont permis de determiner des zones decollees de 0,5mm diametre dans de elements de 2 mm d'epaisseur. (author) [Spanish] Se describe en esta memoria un aparato automatico destinado a verificar, por un metodo ultrasoniso, la calidad de las vainas fabricadas con elementos colaminados. Estos elementos movidos por rodillos pasan bajo el haz ultrasonico sumergidos en una cuba de acero inoxidable llena de agua. Un reflector auxiliar permite utilizar los mismos transductores para la emision y la recepcion. La exploracion de las placas se lleva a cabo mediante seis transductores dispuestos en la periferia de un disco rotativo. Los transductores entran en funcion uno tras otro, cada 1/6 de vuelta, por intermedio de un sistema reles accionados por sectores imanados. De esta

  9. Mortalidad intrahospitalaria por accidente cerebrovascular

    Directory of Open Access Journals (Sweden)

    Federico Rodríguez Lucci

    2013-08-01

    Full Text Available La mortalidad global por accidente cerebrovascular (ACV ha disminuido en las últimas tres décadas, probablemente debido a un mejor control de los factores de riesgo vascular. La mortalidad hospitalaria por ACV ha sido tradicionalmente estimada entre 6 y 14% en la mayoría de las series comunicadas. Sin embargo, los datos de ensayos clínicos recientes sugieren que esta cifra sería sustancialmente menor. Se revisaron datos de pacientes internados con diagnóstico de ACV del Banco de Datos de Stroke de FLENI y los registros institucionales de mortalidad entre los años 2000 y 2010. Los subtipos de ACV isquémicos se clasificaron según criterios TOAST y los ACV hemorrágicos en hematomas intrapanquimatosos, hemorragias subaracnoideas aneurismáticas, malformaciones arteriovenosas y otros hematomas intraparenquimatosos. Se analizaron 1514 pacientes, 1079 (71% con ACV isquémico (grandes vasos 39%, cardioembólicos 27%, lacunares 9%, etiología indeterminada 14%, otras etiologías 11% y 435 (29% con ACV hemorrágico (intraparenquimatosos 27%, hemorragia subaracnoidea 30%, malformaciones arteriovenosas 25% y otros hematomas espontáneos 18%. Se registraron 38 muertes intrahospitalarias (17 ACV isquémicos y 21 ACV hemorrágicos, representando una mortalidad global del 2.5% (1.7% en ACV isquémicos y 4.8% en ACV hemorrágicos. No se registraron muertes asociadas al uso de fibrinolíticos endovenosos. La mortalidad intrahospitalaria en pacientes con ACV isquémico y hemorrágico en nuestro centro fue baja. El manejo en un centro dedicado a las enfermedades neurológicas y el enfoque multidisciplinario por personal médico y no médico entrenado en el cuidado de la enfermedad cerebrovascular podrían explicar, al menos en parte, estos resultados.

  10. Herida precordial por arma blanca

    OpenAIRE

    Marcelo F. Jiménez; Nuria Novoa; José Luis Aranda; Gonzalo Varela

    2005-01-01

    Varón de 42 años con esquizofrenia paranoide. Intento de suicidio con tres autolesiones por arma blanca (Fig. 1). Fue traído al hospital en estado consciente, taquicárdico, taquipneico y con tensión arterial (TA) de 140/90 mmHg. Fue trasladado al quirófano, donde se practicó una toracotomía axilar izquierda sin extraer el arma. Durante la intervención se apreciaron tres heridas incisas, dos no penetrantes, hemotórax de 150 ml, herida pericárdica de 4 cm, sin lesiones cardíacas. La hoja del ar...

  11. Industrial Ultrasonic Inspection of Stainless-Steel Claddings for the EL4 Reactor; Controle Industriel par Ultrasons des Gaines en Acier Inoxydable du Reacteur EL4; Promyshlennyj kontrol' obolochechnykh trub iz nerzhaveyushchej stali reaktora dlya EL4 s pomoshch'yu ul'trazvukovogo metoda; Metodos Ultrasonicos para Control Industrial de las Vainas de Acero Inoxidable del Reactor EL4

    Energy Technology Data Exchange (ETDEWEB)

    Prot, A. C.; Foulquoer, H. E.; Peyrot, J. P. [Centre d' Etudes Nucleaires de Saclay (France)

    1965-09-15

    del metodo a utilizar representa un proceso delicado, cuyas consideraciones fundamentales se exponen en el presente trabajo. Una vez elegido el metodo y puesto a punto en el laboratorio, surgen dos nuevos problemas: Transposicion a escala industrial. Necesidad de tener siempre presente la calidad que puede alcanzarse en la industria, en relacion con normas de aceptacion definidas de manera mas o menos arbitraria. En la practica, ello obliga a realizar un estudio estadistico sobre partidas de tubos de diversos origenes y clasificarlos teniendo en cuenta umbrales de aceptacion de distintos grados de severidad. Como se ve en el trabajo, el numero de tubos a controlar es muy superior al previsto inicialmente. Este hecho indujo a estudiar una maquina de control automatico, capaz de satisfacer al mismo tiempo las exigencias de la cantidad y las propias del tipo de control seleccionado; estas ultimas son por lo general de orden mecanico y requieren una construccion especialmente esmerada. El conjunto de estas consideraciones llevo a concebir una maquina capaz de satisfacer sin dificultad las necesidades de una cadena de fabricacion'de elementos combustibles. Las posibilidades de esta maquina estan estrechamente ligadas a las caracteristicas del material descontrol escogido, sobre todo al rendimiento de los circuitos electronicos correspondientes a los aparatos de control por metodos ultrasonicos y al de los transductores utilizados. Se deduce del presente estudio, por otra parte, que el material corriente no responde al problema sino de manera muy imperfecta, y que se debe encarar desde ya el proyecto de un aparato especial para este tipo de control. (author) [Russian] Uluchshenie rabochih harakteristik reaktorov trebuet primenenija tshhatel'no razrabotannyh i strogo kontroliruemyh materialov. Odnim iz aspektov jetogo kontrolja javljaetsja kachestvo ispol'zuemyh pokrytij dlja trub, mehanicheskoe sostojanie kotoryh predstavljaet soboj sushhestvennyj faktor rentabel

  12. Analytical Evaluation to Determine Selected PAHs in a Contaminated Soil With Type II Fuel; Metodo Optimizado de Extraccion por Ultrasonidos para la Determinacion de PAHs Seleccionados en un Suelo Contaminado con Fuel de Tipo II

    Energy Technology Data Exchange (ETDEWEB)

    Garcia Alonso, S.; Perez Pastor, R. M.; Sevillano Castano, M. L.; Garcia Frutos, F. J.

    2010-10-21

    A study on the optimization of an ultrasonic extraction method for selected PAHs determination in soil contaminated by type II fuel and by using HPLC with fluorescence detector is presented. The main objective was optimize the analytical procedure, minimizing the volume of solvent and analysis time and avoiding possible loss by evaporation. This work was carried out as part of a project that investigated a remediation process of agricultural land affected by an accidental spillage of fuel (Plan Nacional I + D + i, CTM2007-64 537). The paper is structured as: Optimization of wavelengths in the chromatographic conditions to improve resolution in the analysis of fuel samples. Optimization of the main parameters affecting in the extraction process by sonication. Comparison of results with those obtained by accelerated solvent extraction. (Author) 3 refs.

  13. Determination of rare earth and uranium in reference biological materials certified by the method of neutron activation analysis; Determinacao de terras raras e de uranio em materiais biologicos de referencia certificados pelo metodo de analise por ativacao com neutrons

    Energy Technology Data Exchange (ETDEWEB)

    Pereira, Lais H.P.; Saiki, Mitiko, E-mail: laispaciulli@gmail.com, E-mail: mitiko@ipen.br [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2013-07-01

    The objective of this study was to evaluate the precision and accuracy of the determinations of Sc, La, Ce, Nd, Sm, Eu, Tb, Yb, Lu and U in certified reference materials (CRMs). To solve the problem of interference from fission products of U in the determination of lanthanides were obtained correction factors for this interference for {sup 140}La, {sup 141}Ce, {sup 143}Ce, {sup 153}Sm and {sup 147}Nd. The experimental procedure of Neutron Activation Analysis consisted of irradiating aliquots of each of the CRMs with synthetic standards of elements under thermal neutron flux of the IEA-R1 nuclear reactor, followed by gamma-ray spectrometry using a high-resolution hyperpurity GE detector. The analyzes of CRMs indicate good accuracy and precision of results, demonstrating the feasibility of applying of established procedure in NAA of elements studied in organic vegetable matrices.

  14. Reshaping of computational system for dosimetry in neutron and photons radiotherapy based in stochastic methods - SISCODES; Remodelagem do sistema computacional para dosimetria em radioterapia por neutrons e fotons baseado em metodos estocasticos - SISCODES

    Energy Technology Data Exchange (ETDEWEB)

    Trindade, Bruno Machado

    2011-02-15

    This work shows the remodeling of the Computer System for Dosimetry of Neutrons and Photons in Radiotherapy Based on Stochastic Methods . SISCODES. The initial description and status, the alterations and expansions (proposed and concluded), and the latest system development status are shown. The SISCODES is a system that allows the execution of a 3D computational planning in radiation therapy, based on MCNP5 nuclear particle transport code. The SISCODES provides tools to build a patient's voxels model, to define a treatment planning, to simulate this planning, and to view the results of the simulation. The SISCODES implements a database of tissues, sources and nuclear data and an interface to access then. The graphical SISCODES modules were rewritten or were implemented using C++ language and GTKmm library. Studies about dose deviations were performed simulating a homogeneous water phantom as analogue of the human body in radiotherapy planning and a heterogeneous voxel phantom, pointing out possible dose miscalculations. The Soft-RT and PROPLAN computer codes that do interface with SISCODES are described. A set of voxels models created on the SISCODES are presented with its respective sizes and resolutions. To demonstrate the use of SISCODES, examples of radiation therapy and dosimetry simulations for prostate and heart are shown. Three protocols were simulated on the heart voxel model: Sm-153 filled balloon and P-32 stent, to prevent angioplasty restenosis; and Tl-201 myocardial perfusion, to imaging. Teletherapy with 6MV and 15MV beams were simulated to the prostate, and brachytherapy with I-125 seeds. The results of these simulations are shown on isodose curves and on dose-volume histograms. The SISCODES shows to be a useful tool for research of new radiation therapy treatments and, in future, can also be useful in medical practice. At the end, future improvements are proposed. I hope this work can contribute to develop more effective radiation therapy treatments. (author)

  15. H{sub 2} as source of renewable energy: production through catalytic methods by means of the reforming of methanol; H{sub 2} como fuente de energia renovable: produccion por metodos cataliticos mediante el reformado de metanol

    Energy Technology Data Exchange (ETDEWEB)

    Perez H, R; Lopez, P; Gutierrez M, A; Gutierrez W, C; Mondragon G, G; Mendoza A, D [ININ, Departamento de Tecnologia de Materiales, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico); Angeles Ch, C [Instituto Mexicano del Petroleo, Programa de Ingenieria Molecular, Eje Central Lazaro Cardenas Norte 152, Col. San Bartolo Atepehuacan, 07730 Mexico D. F. (Mexico); Arenas A, J., E-mail: raul.perez@inin.gob.m [UNAM, Instituto de Fisica, Ciudad Universitaria, 04510 Mexico D. F. (Mexico)

    2010-07-01

    The fuel cells transform the chemical energy stored in the connection H-H of the H{sub 2} molecule in electric energy and water vapor when is combines with the oxygen. Even when the hydrogen has a high potential as energy source, its handling is difficult (storage and transport). This has motivated the search of hydrogen production methods in situ starting from liquid fuels like the methanol or ethanol through the reaction of reforming. The methanol is a fuel of easy availability for fuel cells with electronic applications and of transport. Although the methanol energy density is approximately half of the gasoline and diesel, it is more reagent and can be used directly in fuel cells or can also be reformed to low temperatures for the hydrogen obtaining to be used in fuel cells of proton exchange. In this article the results obtained of the systems, Cu-Ni/ZrO{sub 2} and Ag-Au(1-D)-CeO{sub 2} are presented and can be competitive to generate H{sub 2} and being used in the fuel cells to generate energy. (Author)

  16. Preparation and LSC Standardization of ''89Sr (DNP) Using the CIEMAT/NIST Method; Preparacion del ''89Sr(DNP) y calibracion por centelleo liquido, mediante el metodo CIEMAT/NIST

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez Barquero, L.; Los Arcos Merino, J. M.; Grau Malonda, A.

    1994-07-01

    A procedure for preparation of liquid scintillation counting samples of the strontium DNP complex, labelled with ''89Sr, is described, the chemical quench, the counting stability and spectral evolution of this compound is studied in six scintillators, Toluene, Toluene-alcohol, Dioxane-naphthalene, HiSafe II, Ultima- Gold and Instagel. The liquid scintillation standardization of 89Sr-DNP by the CIEMAT/NIST method, using HiSafe II and Ultima-Gold scintillators, has been carried out. The discrepancies between experimental and computed efficiencies are lower than 0.38% and 0.48%, respectively. The solution has been standardized in terms of activity concentration to an overall uncertainty of 0,38%. (Author) 10 refs.

  17. Liquid Scintillation Counting Standardization of {sup 2}2NaCl by te CIEMAT/NIST method; Calibracion por Centelleo Liquido del ''22NaCl, mediante el metodo CIEMAT/NIST

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez Barquero, L.; Grau Carles, A.; Grau Malonda, A.

    1995-07-01

    We describe a procedure for preparing a stable solution of ''22NaCl for liquid scintillation counting and its counting stability and spectral evolution in Insta-Gel''R is studied. The solution has been standardised in terms of activity concentration by the CIEMAT/NIST method with discrepancies between experimental and computed efficiencies lower than 0.4 % and an overall uncertainty of 0.35 %. (Author) 4 refs.

  18. Liquid scintillation counting standardization of 125I in organic and inorganic samples by the CIEMAT/NIST method; Calibracion por centelleo liquido del 125I en muestras inorganicas y organicas, mediante el metodo CIEMAT/NIST

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez Barquero, L.; Grau Malonda, A.; Los Arcos Merino, J. M.; Grau Carles, A.

    1994-07-01

    The liquid scintillation counting standardization of organic and inorganic samples of ''I25I by the CIEMAT/NIST method using five different scintillators is described. The discrepancies between experimental and computed efficiencies are lower than 1.4% and 1.7%, for inorganic and organic samples, respectively, in the interval 421-226 of quenching parameter. Both organic and inorganic solutions have been standardized in terms of activity concentration to an overall uncertainty of 0.76%. (Author) 14 refs.

  19. Synthesis and characterization of Ni-CeO{sub 2} catalysts by the hydrothermal method; Sintesis y caracterizacion de catalizadores de Ni-CeO{sub 2} por el metodo hidrotermal

    Energy Technology Data Exchange (ETDEWEB)

    Lazcano O, I.

    2013-07-01

    At the present time the necessity exists to reduce the level of atmospheric pollutants, because these are the main originators of such problems as: the greenhouse effect, acid rain, global heating, among others and that are affecting the human being seriously. In this context, is necessary to look for new solutions that contribute to the improvement of the problems without appealing to limitations in the energy production, because this would imply a non only delay in the economic development, but also in the cultural, technological and of research in our country. An alternative for the energy solution is the use of renewable fuels, because they will decrease the production costs with the time, as well as to diminish the dependence of the fossil fuels, contributing this way to the improvement of the environment quality. The use of the hydrogen as an alternating fuel to the petroleum, is intends as energy solution. The objective of the present work is to develop Ni-CeO{sub 2} catalysts through the hydrothermal method for the hydrogen production starting from the partial oxidation reaction of methanol for the clean fuel generation that does not produce polluting emissions to the environment. As well as, to determine the importance of the metallic load in the catalytic activity for which catalysts to 1 and 2% in weight of Ni were prepared. To achieve these objective different techniques were used to characterize the prepared catalysts, as: Temperature Programmed Reduction to evidence the metal-support interaction, Scanning Electron Microscopy (Sem) to determine the morphology of the catalysts, Surface Area (Bet) with respect to the adsorption-desorption of N{sub 2} and X-Rays Diffraction (XRD) to know the crystalline structure of the catalysts. Also the catalytic properties (activity and selectivity) were studied under the reaction: CH{sub 3}OH + 1/2 O{sub 2} obtaining as products to the CO{sub 2} + 2H{sub 2}, with the help of the multi-tasks equipment Rig-100 that operated to temperatures among 200 at 450 C. In the results was observed that the Ni-CeO{sub 2} catalyst to 2% in nickel weight was more efficient in the interval of 275 to 400 C regarding the catalyst to 1% of Ni and the CeO{sub 2} matrix. (Author)

  20. Visualisation of Proficiency Test Exercise by Means of Kiri Plots. Informatics Application; Metodo de Visualizacion de los Resultados de las Pruebas de Capacitacion por medio de la Grafica de Kiri. Aplicacion Informatica

    Energy Technology Data Exchange (ETDEWEB)

    Gasco, C.; Trinidad, J. A.

    2012-09-13

    This report describes the visualisation procedure of the proficiency tests by means of Kiri Plots, based on three tests: z-score, zeta-score and the relative uncertainty outlier. The results assessment of the intercomparison exercises and proficiency tests among Spanish environmental radioactivity laboratories and Spanish Nuclear Power Plants Laboratories is performed by Environmental Radioactivity and Radiological Surveillance Unit following the ISO-43 e ISO/ IUPAC standards and applying the z-score test. The application of new graphics methods and tests to a better evaluation of uncertainties reported by Labs is described in this paper. An informatics programme has been developed in Visual Basic for applications that allows the graphic representation of Tables and Figures automatically in an excel-sheet and later statistical simulations changing the ratios between the reference value uncertainties and the concentration activities values from the participants laboratories. (Author) 26 refs.

  1. Development of a new technic for breast attenuation correction in myocardial perfusion scintigraphy using computational methods; Desenvolvimento de uma nova tecnica para correcao da atenuacao por tecidos moles em cintilografia de perfusao miocardica utilizando metodos computacionais

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Anderson de

    2015-07-01

    Introduction: One of the limitations of nuclear medicine studies are false-positive results that lead to unnecessary exams and procedures associated to morbidity and costs to the individual and society. One of the most frequent causes for reducing the specificity of myocardial perfusion imaging (MPI) is photon attenuation, especially by breast in women. Objective: To develop a new technique to compensate the photon attenuation by women breasts in myocardial perfusion imaging with {sup 99m}Tc-sestamibi, using computational methods. Materials and methods: A procedure was proposed which integrates Monte Carlo simulation, computational methods and experimental techniques. Initially, were obtained the chest attenuation correction percentages using a phantom Jaszczak and breast attenuation percentages by Monte Carlo simulation method, using the EGS4 program. The percentages of attenuation correction were linked to individual patients' characteristics by an artificial neural network and a multivariate analysis. A preliminary technical validation was done by comparing the results of the MPI and catheterism (CAT), before and after applying the technique to 4 patients. The t test for parametric data, Wilcoxon, Mann-Whitney and X{sup 2} for the others were used. Probability values less than 0.05 were considered statistically significant. Results: Each increment of 1 cm in the thickness of breast was associated to an average increment of 6% on photon attenuation, while the maximum increase related to breast composition was about 2%. The average chest attenuation percentage per unit was 2.9%. Both, the artificial neural network and linear regression, showed an error less than 3% as predictive models for percentage of female attenuation. The anatomical-functional correlation between MPI and CAT was maintained after the use of the technique. Conclusion: Results suggest that the proposed technique is promising and could be a possible alternative to other conventional methods employed today. (author)

  2. Irradiation alternative method of manganese sulfate solution by a Pu-Be source for efficiency measurements; Metodo alternativo de irradiacao da solucao de sulfato de manganes por uma fonte de Pu-Be para medicoes de eficiencia

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Fellipe Souza da; Martins, Marcelo Marques; Pereira, Walsan Wagner, E-mail: fellipess@ird.gov.br [Instituto de Radioprotecao e Dosimetria (IRD/CNEN-RJ), Rio de Janeiro, RJ (Brazil)

    2015-07-01

    This study intends to create an alternative irradiation system from a Plutonium-Beryllium source for manganese sulphate solution using the Monte Carlo code. Thus seeking to eliminate the issue of institutes that do not have reactors or particle accelerators in its infrastructure, in order to optimize and provide independence for them to carry out efficiency measurements of MnSO{sub 4} solution in their own locality. The Monte Carlo simulations defined the technical features of this new system so that the solution reaches the maximum neutron capture by manganese in solution. (author)

  3. Zinc oxide films impurified with Ti and prepared by the Sol-gel method; Peliculas de oxido de zinc impurificadas con Ti y preparadas por el metodo Sol-gel

    Energy Technology Data Exchange (ETDEWEB)

    Tirado G, S. [ESFM-IPN, 07738 Mexico D.F. (Mexico); Cazares R, J.M.; Maldonado, A. [CINVESTAV-IPN, A.P. 14-740, 07000 Mexico D.F. (Mexico)

    2006-07-01

    Titanium-doped zinc oxide thin films have been prepared on silicon substrate using the Sol-Gel technique. The structural, morphology, electrical and optical properties of such thin films were studied as a function of titanium concentration (0.5, 1 and 1.5 %) and the thin films thickness. Zinc acetate dihydrate and titanium (VI)-oxy acetylacetonate were used as precursor materials, using 2-methoxyethanol and monoethanolamine as via. The X-ray diffraction spectra show polycrystalline films in all the cases. It can see for all the thin films a preferential growth along the (002) planes where the titanium concentration and also the thin films thickness play an important rule. No structural changes are observed at all. The surface morphology studied shows as the grain size decreases when thin thickness is increases. For titanium concentration of 0.5, 1 and 1.5 % values the grains size increase also. The thin films thickness for titanium concentration of 1.5 % was 500 nm (4v), 400 nm (3v), 180 nm (2v) and 130 nm (1v), values obtained from cross-section micrographs. Highly resistive samples are obtained for substrate soda-lime even showing high transmittance. Better physical properties are required for gas sensors or semitransparent electrodes and other possible applications. (Author)

  4. Neutron Skyshine in shielding projects of radiotherapy: comparison between theoretical approach and simulation by Monte Carlo method; 'Skyshine' de neutrons em projetos de blindagens de radioterapia: comparacao entre abordagem teorica e simulacao por metodo de Monte Carlo

    Energy Technology Data Exchange (ETDEWEB)

    Falcao, R.C.; Facure, A. [Comissao Nacional de Energia Nuclear (CNEN), Rio de Janeiro, RJ (Brazil); Santini, E.S. [Comissao Nacional de Energia Nuclear (CNEN), Rio de Janeiro, RJ (Brazil); Centro Brasileiro de Pesquisas Fisicas (CBPF), Rio de Janeiro, RJ (Brazil); Silva, A.X. [Coordenacao dos Programas de Pos-Graduacao de Engenharia (PEN/COPPE/UFRJ), RJ (Brazil). Programa de Engenharia Nuclear

    2005-07-01

    In this work, the MCNP code is used to simulate the transport of neutrons in a room of radiotherapy, whose shieldings are designed according to the method of skyshine (scattering in the atmosphere). The simulations are compared with the results obtained from empirically established expressions, which are normally used for designing the ceilings of the rooms facilities, ensuring that dose rates (neutrons + photons) around them do not exceed the maximum limits allowed by the standards of the CNEN. Good agreement is observed between the doses calculated according to these expressions and those obtained through simulation by Monte Carlo in the case of rooms without ceiling, and an overestimate of the calculations by a factor 2 or 3 in relation to the simulations, in the case of rooms with ceiling.

  5. Transmission of Helicobacter pylori via water for human consumption. Determination by means of the molecular method using PCR; Helicobacter pylori, su transmision a traves de las aguas para el consumo humano. Determinacion por metodo molecular con la PCR

    Energy Technology Data Exchange (ETDEWEB)

    Amo, A. J.; Moreno, C.; Apraiz, D.; Catalan, V. [LABAQUA. Alicante (Spain)

    1998-12-31

    Helicobacter pylori is the cause of chronic gastritis, duodenal ulcers and stomach cancer. Its natural reservoirs and transmission mechanisms are still little understood. The gastro-oral route-especially vomiting and regurgitation-is one transmission path, especially in young children and babies. It has been found in some patients saliva and dental plaque, which suggests a possible oral-oral contagion route. The discovery of H. Pylori human excrement points to a faecal-oral route as the main transmission pathway via water for human consumption. It is therefore important to develop detection methods such as isolation by culture and polymerase chain reaction (PCR) to effectively monitor this pathogen in human drinking water. (Author) 30 refs.

  6. Analysis of the thermoluminescent signal in the hydroxyapatite synthesized by the sol-gel method; Analisis de la senal termoluminiscente en la hidroxiapatita sintetizada por el metodo sol gel

    Energy Technology Data Exchange (ETDEWEB)

    Mendoza A, D.; Gonzalez, P.R. [ININ, A.P. 18-1027, 11801 Mexico D.F. (Mexico); Lobato, M.; Rubio, E.; Rodriguez L, V. [Fac. de Ingenieria Quimica, BUAP, Av. San Claudio y 18 Sur, Col. San Manuel, 72570 Puebla (Mexico); Custodio, E. [Universidad Juarez Autonoma de Tabasco, DACB, Carr. Cunduacan-Jalpa Km. 1.5, 86680 Tabasco (Mexico)

    2004-07-01

    The physical properties of the ceramics are related with the chemical bonds and the crystalline structure, because the elements that constitute it can be united by ionic bonds or partially ionic giving a covalent character, this last causes that the outer layer is full of electrons. This property makes that the ceramic ones become interesting materials for thermoluminescent applications, as it demonstrates through the recent works presented on the hydroxyapatite that is a ceramic biomaterials that has shown an interesting thermoluminescent signal when being exposed to gamma radiation. In this sense, this work presents the thermoluminescent signal analysis induced by the UV and gamma radiation in a particular type of hydroxyapatite synthesized by sol gel method in which the temperature synthesis is varied. The final thermoluminescent sensitivity of materials is correlated with the crystalline degree, which is analysed through X-ray diffraction. (Author)

  7. Contribution to the spectrographic determination of impurities in uranium by the carrier distillation method; Nuevas aportaciones a la determinacion espectrografica de impurezas en materiales de uranio por el metodo de distilacion fraccionada con portador

    Energy Technology Data Exchange (ETDEWEB)

    Capdevila, C

    1967-07-01

    The carrier distillation method for the determination of impurities in uranium has been modified in order to get a greater sensitivity. Electrodes 9.5 mm. diam. with a crater 7 mm. diam. and 10 mm. deep have been used, being the weigh of charge 300 mg.. The elements considered were: Al, As, B, Ca, Cd, Co, Cr, Cu, Fe, Mg, Mn, Mo, Ni, P, Pb, Si, Sn, Ti and V, over the range 0.01 to 30 ppm. (Author) 13 refs.

  8. Molecular structure determination of cyclooctane by Ab Initio and electron diffraction methods in the gas phase; Determinacao da estrutura molecular do ciclooctano por metodos Ab Initio e difracao de eletrons na fase gasosa

    Energy Technology Data Exchange (ETDEWEB)

    Almeida, Wagner B. de [Minas Gerais Univ., Belo Horizonte, MG (Brazil). Dept. de Quimica

    2000-10-01

    The determination of the molecular structure of molecules is of fundamental importance in chemistry. X-rays and electron diffraction methods constitute in important tools for the elucidation of the molecular structure of systems in the solid state and gas phase, respectively. The use of quantum mechanical molecular orbital ab initio methods offer an alternative for conformational analysis studies. Comparison between theoretical results and those obtained experimentally in the gas phase can make a significant contribution for an unambiguous determination of the geometrical parameters. In this article the determination for an unambiguous determination of the geometrical parameters. In this article the determination of the molecular structure of the cyclooctane molecule by electron diffraction in the gas phase an initio calculations will be addressed, providing an example of a comparative analysis of theoretical and experimental predictions. (author)

  9. Catalyst synthesis PD/SiO{sub 2} and PD/C by irradiation microwave method; Sintese de catalisador PD/SiO{sub 2} e PD/C por metodo de irradiacao micro-ondas

    Energy Technology Data Exchange (ETDEWEB)

    Sant' Anna, L.S.; Franceschi, E.; Egues, S.; Santos, M.L.; Dariva, C.; Borges, G.R., E-mail: leonardo-se@hotmail.com [Universidade Tiradentes (UNIT), Aracaju, SE (Brazil). Nucleo de Estudos em Sistemas Coloidais

    2016-07-01

    The synthesis of nanoparticulate materials has been developed over the years, in order to propose new routes or routes more efficient in the process. The application of microwave irradiation applied in this work allowed to show that metal catalysts may be generated in a faster reaction time compared to conventional mechanical agitation techniques. Catalysts using palladium acetate (OAc){sub 2} supported on charcoal and commercial silica were synthesized. The solvent used for the preparation was 40 ml of ethanol at a temperature of 100 ° C and 300 W power. The synthesis time was 2 to 5 minutes. The synthesized material was calcined and characterized by ICP, XRD, TEM and BET obtained metal content ranged from 1.1 to 4.1% of the metal support. The particle size was between 7 and 9 nm. The surface areas of the carriers were reduced on its surface due to the metal impregnation. (author)

  10. Validation of uncertainty of weighing in the preparation of radionuclide standards by Monte Carlo Method; Validacao da incerteza de pesagens no preparo de padroes de radionuclideos por Metodo de Monte Carlo

    Energy Technology Data Exchange (ETDEWEB)

    Cacais, F.L.; Delgado, J.U., E-mail: facacais@gmail.com [Instituto de Radioprotecao e Dosimetria (IRD/CNEN-RJ), Rio de Janeiro, RJ (Brazil); Loayza, V.M. [Instituto Nacional de Metrologia (INMETRO), Rio de Janeiro, RJ (Brazil). Qualidade e Tecnologia

    2016-07-01

    In preparing solutions for the production of radionuclide metrology standards is necessary measuring the quantity Activity by mass. The gravimetric method by elimination is applied to perform weighing with smaller uncertainties. At this work is carried out the validation, by the Monte Carlo method, of the uncertainty calculation approach implemented by Lourenco and Bobin according to ISO GUM for the method by elimination. The results obtained by both uncertainty calculation methods were consistent indicating that were fulfilled the conditions for the application of ISO GUM in the preparation of radioactive standards. (author)

  11. Development of and horizontal seams wining system by means of galleries and chambers; Demostracion de un Sistema de Explotacion de Capas Horizontales por el Metodo de Pilares y Galerias Trazadas Integramente con Maquinas de Ataque Puntual

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2000-07-01

    The project Development of an horizontal seams wining system by means of galleries and chambers aimed on the solution of a mining problem kept unresolved during the last 35 years in Carrasconte mine, owned by the society Minero Siderurgica de Ponferrada, in the coal yield of Villablino, Leon, Spain. The problem was a horizontal seam, with a width from 2,5 to 3,5 m, with two specific characteristics; one, roof and floor extremely rigid, with a 30 m sandstone stratum by roof that practically could highly restrict the long wall face conventional system, and the other, an intercalation of shale with a width of 1,2 m and a hardness of near 400 kg/cm2 that required a suitable winning system. By means of investigation with galleries carried out by continuous miners the real width of shale intercalation was stated, an then suitable systems adopted as this width varied. So, short wall faces in areas with minimum shale were disposed, and in t areas with maximum shale width, two long wall faces each one in each different vein were designed. At the end, the borders of reserves were recovered by the conventional system of galleries and chambers. This development project has allowed to recover more than a million tons in three years by systems suitable to the different conditions of the seam. (Author)

  12. Optimizing the mercury mass measurement in industrial electrolytic cells by the radio-tracer method at ININ; Optimizacion de la medicion de masa de mercurio en celdas electroliticas industriales por el metodo de radiotrazado en el ININ

    Energy Technology Data Exchange (ETDEWEB)

    Valle R, J.; Angeles C, A., E-mail: Ing.valle.r@hotmail.com [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico)

    2014-10-15

    One method used in the production of chlorine and sodium is the use of electrolytic cells for the separation of chlorine and sodium from the brine; the industries apply very intense electromagnetic fields in this process. The electrolytic cells use mercury as electrode. In a chlorine production plant inventories are determined by total amount of mercury in the plant annually, since mercury losses are large and a very important parameter is to control the mass of mercury for it is necessary to measure with great precision the losses made. There are several methods to determine the mass of mercury ranging from take samples and weigh, but this involves continuous interruption of the process creating downtimes which in turn represent economic losses giving a result delimiting productivity for the industrial sector. An alternative and attractive method is to use a radioactive tracer whose principle has a similar behavior to study objective. The inert mercury has to be neutron activated in a nuclear reactor to having the characteristics of a tracer; the result makes one of the isotopes of mercury. The tracer is transported taking into account the recommendations of the Comision Nacional de Seguridad Nuclear y Salvaguardias (Mexico), then it is injected into the electrolytic cells mixing with the mercury in the system. By a relative radioactivity measurement and one sample by gamma spectrometry per interest cell, the mass of mercury without stopping the process is obtained. For optimal use of radio-tracer method must be taken into account as important features: irradiation time of mercury, counting conditions, vial geometry, sample volume, sample cells, mixing time and half-life of the tracer. (Author)

  13. Comparison in the determination of absorbed dose by biological and physical methods to patients in treatment of cardiac intervention; Comparacion en la determinacion de dosis absorbida por metodos biologicos y fisicos a pacientes en tratamiento de intervencionismo cardiaco

    Energy Technology Data Exchange (ETDEWEB)

    Guerrero C, C.; Arceo M, C., E-mail: citlali.guerrero@inin.gob.mx [ININ, Departamento de Biologia, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico)

    2014-10-15

    The use of less invasive procedures, lower risk and quick recovery as cardiac intervention have proven to be an efficient alternative to reestablish the correct bloodstream of the patient. In this case the patient is subjected to values of absorbed dose above to which is subjected in a study with X-rays for medical diagnosis, and this can cause radiation injuries to the skin. The target organ, in this case can be exposed to doses of 2 Gy above. Different methods to estimate the dose were use, physical by Radiochromic film, as biological by dicentric analysis. Both methods provided additional information demonstrating thus the risk in the target organ and the patient. The most reliable biological indicator of exposure to ionizing radiation is the study of chromosomal aberrations, specifically dicentric in human lymphocytes. This test allowed establishing the exposure dose depending of the damage. (Author)

  14. Petroleum reservoir fault reactivation problem analysis through finite element viscodamage model; Analise de problema de reativacao de falha em reservatorio de petroleo por modelo de viscodano via metodo dos elementos finitos

    Energy Technology Data Exchange (ETDEWEB)

    Fernandes, Julliana de P.V.; Guimaraes, Leonardo J. do N.; Gomes, Igor F.; Pontes Filho, Ivaldo Dario da S. [Universidade Federal de Pernambuco (UFPE), Recife, PE (Brazil)

    2008-07-01

    Recently, many new constitutive models for geomechanical materials were developed taking into account its complex behavior. The continuum damage mechanics, formulated according to irreversible thermodynamics principles, can be used to model materials subjected to degradation of its mechanical properties. Reservoir depletion may result in compaction and subsidence that induces fault reactivation, among others consequences. The fault reactivation problem in petroleum reservoirs has been widely studied as its changes completely the flow regime in subsurface. Isotropic damage model can be used to model the fault reactivation process, where its hydro-mechanical properties (stiffness and permeability) are affected during the reservoir production. In this paper, a fault reactivation case in a synthetic reservoir is presented and a sensibility analysis is carried out to identify the main variables that influence this process. (author)

  15. Method for evaluation of doses from ingestion of polonium, bismuth and lead as natural radioactive material(NORM); Metodo de evaluacion de dosis por ingestion de polonio, bismuto y plomo como materiales radiactivos naturales

    Energy Technology Data Exchange (ETDEWEB)

    Pena, Vanessa; Puerta, Anselmo; Morales, Javier, E-mail: vpenam@ullal.edu.co, E-mail: japuerta@unal.edu.co, E-mail: jmorales@unal.cdu.co [Universidad Nacional de Colombia, Medellin (Colombia). Grupo de Fisica Radiologica

    2013-07-01

    In this work was carried out an evaluation of dose from ingestion of radioactive daughters of radon (lead, bismuth and polonium), taking into account ages from three months up to adult men, using the new model of the human alimentary tract HATM and methodology of calculating doses proposed by the ICRP publication 103, which allows the estimation of dose based on the concentration of the radionuclide present in the diet or in the water of consumption.

  16. Modelos de desarrollo de software de exportacion en el contexto de una region emergente: Caso area metropolitana de Monterrey, analisis de campo por el metodo de regresion lineal multiple.

    Directory of Open Access Journals (Sweden)

    Torres, F.

    2009-01-01

    Full Text Available The objective of this document is to give to know the advantages that the different successful development models have offered for companies development of export software, making a synthesis from the CMM, until arriving to the CMMI, without stopping to make a critical analysis on the two models that have identified the critical factors for the export of software of the called countries of "3I" that they have demonstrated its success in this segment like: the model of factors of success for the software export (Heeks and Nicholson, 2002 and the model Oval (Carmel, E., 2003b, giving the minimum recommendations to the Mexican companies, developments of software export, have the competitiveness required in the international environment. This work is the result of the bibliographical revision of the models of software development and it is part of the doctoral thesis, about a sample of 40 companies developments of software export and the critical factors: Standard technological, Capacity of technological innovation, Formation of human capital, financial Capital and Support in investigation and development, with the purpose of identifying the opportunity areas to improve their international competitiveness, besides the economic results that can be obtained. The present study is based on the application of the statistical technique of the model of multiple lineal regressions, giving the following values: R= 0.549, 2 R =0.302, 2 R Ajus = 0.275. The positioning of the companies Mexican developments of software export and, in the particular case in the Metropolitan Area of the City of Monterrey, in the world market of software and related services, it will depend: that the company has a model to develop software export; of the consolidation of managerial associations of TI for the development of the export software and of the development of managerial consortia of export software in the Metropolitan Area of the City of Monterrey that they come to consolidate this industry in the northeast of the country.

  17. Dating of the archaeological site 'El Tigre' by the thermoluminescent method; Fechamiento del sitio arqueologico 'El Tigre' por el metodo de termoluminiscencia

    Energy Technology Data Exchange (ETDEWEB)

    Portilla, R. De la [ENAH, Periferico Sur y Zapote, 14030 Mexico D.F. (Mexico); Gonzalez, P.R.; Mendoza, D. [ININ, 52750 La Marquesa, Ocoyoacac, Estado de Mexico (Mexico); Vargas, E. [Instituto de Investigaciones Antropologicas, UNAM, 04510 Mexico D.F. (Mexico); Ramirez, A. [Instituto de Geofisica, UNAM, 04510 Mexico D.F. (Mexico)

    2007-07-01

    Full text: The dating of pre hispanic pottery, is supported by techniques such as stratigraphy, typology, in physical and chemical procedures, as the analysis of {sup 14}C and the thermoluminescence (TL). The last one permits us obtain absolute dating of archaeological pottery with an acceptable precision. In this work we apply the applied the thermoluminescent technique to verify the age of the Pre-Classic and Classic Terminal periods proposed for the archaeological site 'El Tigre', Campeche. The samples were obtained during a work period and the radiation of the ground of background (emitted by the ground), as well as the contribution of the cosmic radiation was measured with thermoluminescent dosemeters of LiF: Mg,Cu,P + PTFE, put in the sample zone. The preliminary results indicate that not all the analyzed samples can be dated. The viability of the dating of the samples is discussed based on the fact and function of the presence of certain crystalline phases such as calcite and quartz. The discussion is complemented emphsizing the importance of handling the conditions of handling of samples. (Author)

  18. Analytical method of Kr-85 determination, using cryogenic concentration and separation and liquid scintillation counting; Desarrollo del metodo de concentracion y se paracion criogenica cromatografica y medida radiactiva por centelleo liquido de Kr-85

    Energy Technology Data Exchange (ETDEWEB)

    Heras, M C; Perez, M M; Grau, A

    1983-07-01

    The method used in the Laboratory of the JEN for the determination of Kr-85 levels in gaseous effluents of nuclear power and in the atmosphere is described. Samples of air, collected in metallic cylinders, are introduced into a gas-solid chromatographic separation system which resolves Kr from the other air components. The separated Kr ia dissolved in a toluene based scintillation cocktail, and the Kr-85 content is determined by liquid scintillation counting. (Author)

  19. Spectra and depth-dose deposition in a polymethylmethacrylate breast phantom obtained by experimental and Monte Carlo method; Espectros e deposicao de dose em profundidade em phantom de mama de polimetilmetacrilato: obtencao experimental e por metodo de Monte Carlo

    Energy Technology Data Exchange (ETDEWEB)

    David, Mariano G.; Pires, Evandro J.; Magalhaes, Luis A.; Almeida, Carlos E. de; Alves, Carlos F.E., E-mail: marianogd08@gmail.com [Universidade do Estado do Rio de Janeiro (UERJ), RJ (Brazil). Lab. Ciencias Radiologicas; Albuquerque, Marcos A. [Coordenacao dos Programas de Pos-Graduacao de Engenharia (COPPE/UFRJ), RJ (Brazil). Instituto Alberto Luiz Coimbra; Bernal, Mario A. [Universidade Estadual de Campinas (UNICAMP), SP (Brazil). Instituto de Fisica Gleb Wataghin; Peixoto, Jose G. [Instituto de Radioprotecao e Dosimetria (IRD/CNEN-RJ), Rio de Janeiro, RJ (Brazil)

    2012-08-15

    This paper focuses on the obtainment, using experimental and Monte Carlo-simulated (MMC) methods, of the photon spectra at various depths and depth-dose deposition curves for x-rays beams used in mammography, obtained on a polymethylmethacrylate (PMMA) breast phantom. Spectra were obtained for 28 and 30 kV quality-beams and the corresponding average energy values (Emed) were calculated. For the experimental acquisition was used a Si-PIN photodiode spectrometer and for the MMC simulations the PENELOPE code was employed. The simulated and the experimental spectra show a very good agreement, which was corroborated by the low differences found between the Emed values. An increase in the Emed values and a strong attenuation of the beam through the depth of the PMMA phantom was also observed. (author)

  20. 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)

  1. Synthesis of the lithium metatitanate, Li{sub 2}TiO{sub 3}, by the modified combustion method; Sintesis del metatitanato de litio, Li{sub 2}TiO{sub 3}, por el metodo modificado de combustion

    Energy Technology Data Exchange (ETDEWEB)

    Cruz, D.; Bulbulian, S. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico); Pfeiffer, H. [IIM-UNAM, A.P. 70-360, 04510 Mexico D.F. (Mexico)]. e-mail: sb@nuclear.inin.mx

    2005-07-01

    A modified combustion method to obtain Li{sub 2}TiO{sub 3} it was used, a compound to be used in fusion reactors like tritium generator material. To obtain Li{sub 2}TiO{sub 3} were proven different molar ratios of lithium hydroxide (LiOH), titanium oxide (TiO{sub 2}) and urea (CO(NH{sub 2}){sub 2}), as well as different heating temperatures (550, 650 and 750 C). The characterization of the products it was carried out using X-ray diffraction, Scanning electron microscopy and Thermal gravimetric analysis. The sample prepared with a molar ratio Li: Ti: urea = 2.75: 1: 3 was the one that presented as only product the Li{sub 2}TiO{sub 3}. The particle size and the morphology found in the Li{sub 2}TiO{sub 3}, showed similar particle size and morphology to the TiO{sub 2} used as precursor. (Author)

  2. TiO{sub 2} synthesized by the method of polymeric precursor (Pechini): structure of the intermediate resine; TiO{sub 2} sintetizado por el metodo de precursor polimerico (Pechini): estructura de la resina intermedia

    Energy Technology Data Exchange (ETDEWEB)

    Vargas, M. A.; Granco, Y.; Ochoa, Y.; Ortegon, Y.; Rodriguez Paez, J. E.

    2011-07-01

    In this work, the polymeric precursor method (Pechini method) was used to synthesize titanium dioxide. This process allowed a bigger control on the purity of the oxide and the crystalline phase present in the material. In this case, the principal phase was anatase. The resine obtained in this process was characterized using NMR and IR spectroscopy to determine their structure. With this information we proposed a resine structure model. To finish the process, the resin was thermally treated to obtain TiO{sub 2}. This oxide was characterized using different techniques: ray-X diffraction (RDX) and electron microscopy (TEM and SEM). The results indicated that the TiO{sub 2} anatase phase can be obtained at 450 degree centigrade with a particle size <100nm. (Author) 10 refs.

  3. A study on chemical element determinations in human nails by neutron activation analysis; Estudo sobre determinacao de elementos quimicos em unhas humanas pelo metodo de analise por ativacao com neutrons

    Energy Technology Data Exchange (ETDEWEB)

    Sanches, Thalita Pinheiro

    2012-07-01

    Nail analyses have been the object of study in order to assess the levels of elements accumulated in the human organism and to use this tissue to monitor environmental and occupational exposure, to evaluate the nutritional status, to verify intoxication by toxic metals and to diagnose or to prevent diseases. Nail analyses present advantages due to easy sample collection, storage, transportation and this tissue provides element level accumulation over time. However, there is controversy regarding the application of nail analysis data due to difficulties to establish reliable reference values or element concentration ranges as control values. The objective of this study was to evaluate the factors that can affect nail element concentrations for further sample analyses of a group of individuals by applying neutron activation analysis (NAA). Fingernails and toenails collected from adult individuals of both genders, aged 18 to 71 years, living in the Sao Paulo Metropolitan Region were cut in small fragments, cleaned and dried for analyses. Samples and element standards were irradiated for 16 h under a thermal neutron flux of about 4.5 x 10{sup 12} n cm{sup -2} s{sup -1} at the IEA-R1 nuclear research reactor followed by gamma ray spectrometry. Element concentrations for As, Br, Ca, Co, Cr, Cs, Fe, K, La, Na, Rb, Sb, Sc, Se and Zn were determined. For quality control of the analytical results, certified reference materials were analysed and the results showed good accuracy and precision with relative errors and relative standard deviations lower than 5.1 % and 11.6 %, respectively. Preliminary assays indicated that the contribution due to impurities from plastic involucres used in the irradiation as well as those from nail polishes is very low and could be considered negligible. Results from the nail sample cleaning process using distinct procedures indicated that HNO{sub 3} solution may cause sample dissolution. Sample homogeneity was verified by analysis of a sample in replicate. A comparison of finger and toenail results indicated significant differences (p= 0.05) for the elements Br, Co and Zn. Element concentration comparisons were also made with gender, age and body mass index (BMI) parameters and for the most part showed no significant differences. The differences were found for Zn concentrations when compared between genders in fingernail, for Cs when compared between ages in fingernail. Elements concentrations obtained for both finger and toenail samples presented wide variability and they were of the same order of magnitude or within ranges as those reported in published literature. (author)

  4. Use of activation analysis method for determining trace elements in human nail clippings; Aplicacao do metodo de analise por ativacao a determinacao de elementos tracos em aparas de unhas humanas

    Energy Technology Data Exchange (ETDEWEB)

    Aguiar, Amilton Reinaldo; Saiki, Mitiko [Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil)

    1999-11-01

    This work presents results obtained in nail clipping samples analyses. These nail samples were collected from healthy group of individuals and from patients with cystic fibrosis disease. Irradiation of nail clippings was carried out with a thermal neutron flux from 10{sup 11} to 10{sup 13} n.cm{sup -2}.s{sup -1} at the IEA-R1m nuclear research reactor and the elements Al, As, Br, Ca, cd, Cl, Co, Cr, Cu, Fe, K, Mg, Mn, Na, Se and Zn were determined. The results obtained for healthy group were within the range of concentrations published, for normal population. However for several elements, the group of patients presented higher concentrations than those presented for healthy individuals. The precision and the accuracy of the results were evaluated by analyzing reference materials NIST 1577b Bovine Liver and 1566a Oyster Tissue. (author) 6 refs., 4 tabs.

  5. Neutron activation analysis applied to the determination of trace elements in human nails; Aplicacao do metodo de analise por ativacao com neutrons a determinacao de elementos traco em unhas humanas

    Energy Technology Data Exchange (ETDEWEB)

    Aguiar, Amilton Reinaldo

    2001-07-01

    There is a considerable interest in the determination of trace elements in human nails in order to use this tissue as a monitor of nutritional and healthy status of individuals, of occupational exposure diseases and of the environmental contamination. In this work, instrumental neutron activation analysis was applied to determine trace elements in finger nail clippings to make comparisons between the elemental concentrations obtained in nails from healthy individuals of a control group and those from cystic fibrosis (CF) patients. Firstly, a protocol for sample collection and preparation for analysis was established. Finger and toe nail samples from CF patients were collected at the Instituto da Crianca of Medicine School, University of Sao Paulo, SP. The nail samples from control group were collected from healthy adults and from children living in Sao Paulo city, SP. These samples were cleaned by stirring them witha a diluted Triton X100 solution and then by washing with distilled water and acetone. The analytical procedure consisted of irradiation nail samples and elemental standards in the IEA-R1m nuclear reactor under thermal neutro flux of about 10{sup 12} n cm{sup -2} s{sup -1}, for short and long period irradiations. The activities of the radionuclides were measured using a gamma-ray spectrometer comprising an hyperpure Ge detector and associated electronic system. The biological reference materials Bovine Liver 1577b and Oyster Tissue 1566a, both from National Institute of Standards and Technology, USA were analysed in order to evaluate the accuracy and precision of the results. The analysis of variance (ANOVA) and F-test at the significance level of 5% were used to make a comparison between the sets of results obtained in this work. In the comparison of the results obtained for finger and toe nails from CF patients, the Br concentrations were higher in finger nails that those obtained for toe nails. For the control group of children, the finger nails presented different levels of Br, Cl, Cr, Cu and Fe from those obtained for the toe nails and in the case of control group of adults, significant differences were obtained for Cr, Cl, Cu, K, Mg and Se. Concentrations of elements found in nails from control group of children were significantly different from those obtained for CF group for some elements. These two groups of individuals presented different concentrations of Br and Cr for toe nails and of Cl, Cr, K and Na for finger nails. The highest levels obtained for Cl and Na in nails from CF patients indicate the viability of using these analysis in the diagnosis of this disease. Comparisons between the results of nail samples from control group of children with those obtained for adults also indicated significant differences. Besides, the levels of the elements obtained in this work for nail samples from CF and control groups are within the range values presented in the literature. The elemental concentrations obtained in the analysis of hair samples indicated a good correlation with those obtained for nail samples. (author)

  6. Grafting to Polymethylmethacrylate by the Radiation-Peroxidation Method; Greffage sur le polymethacrylate de methyle par la methode de la radioperoxydation radiochimique; Privivanie k polimetilmetakripatu po metodu radiatsionnogo peroksidirovaniya; Injertos en el polimetilmetacrilato por el metodo de peroxidacion radioinducida

    Energy Technology Data Exchange (ETDEWEB)

    Kircher, J. F.; Markle, R. A.; Lieberman, R.; Sleimers, F. A.; Leininger, R. I. [Batelle Memorial Institute, Columbus, OH (United States)

    1963-11-15

    Studies of the radiation-peroxidation of polymethylmethacrylate (PMMA) are discussed in relation to the subsequent grafting of vinyl pyrrolidone to the peroxidized polymer. The peroxidation has been investigated as a function of dose, PMMA molecular weight, and irradiation temperature. It is shown that low molecular weight PMMA is more effectively peroxidized and grafted at doses of a few megarads than a relatively high molecular weight polymer. It is also observed that increasing the temperature to about the glass sansition also increases peroxidation and grafting. The results are explained in terms to the effects of temperature and molecular weight on the mobility of polymer and fragment radicals. (author) [French] Le memoire decrit les resultats d'etudes sur la radioperoxydation du polymethacrylate de methyle (PMAM) et le greffage ulterieur de vinyle pyrrolidone sur le polymere peroxyde. On a etudie la peroxydation en fonction de la dose du poids moleculaire du PMAM et de la temperature d'irradiation. Les auteurs montrent qu'un polymethacrylate de methyle a poids moleculaire faible est plus facilement peroxyde et greffe a des doses de quelques megarad que ne l'est un polymere a poids moleculaire relativement eleve. Il a egalement ete observe qu'en augmentant la temperature jusqu'au point de passage a l'etat vineux, la peroxydation et les quantites de copolymere greffe augmentent egalement. L'explication des resultats est donnee en fonction des effets de la temperature et du poids moleculaire sur la mobilite du polymere et des radicaux. (author) [Spanish] Los autores examinan los resultados de estudios de la peroxidacion radioinducida del polimetilmetacrilato (PMMA), en relacion con el injerto subsiguiente de vinilpirrolidona en el polimero peroxidado. Han investigado la peroxidacion en funcion de la dosis, del peso molecular del PMMA y de la temperatura de irradiacion. Demuestran que al aplicar dosis de algunos megairad el PMMA de bajo peso molecular se peroxida e injerta con mayor facilidad que un polimero de peso molecular relativamente elevado. Se observa tambien que al elevar la temperatura hasta alcanzar al punto de transicion de la fase vidriosa aumenta el grado de peroxidacion y de injerto. Los autores proponen una explicacion de los resultados, basada en los efectos de la temperatura y del peso molecular sobre la movilidad del polimero y de los radicales. (author) [Russian] Issledovano radiatsionnoe okislenie polimetilmetakrilata (RMMA) v perekisnoe soedinenie v svyazi s posleduyushchim privivaniem pirrolidonvinila k perekisnomu polimeru. Peroksidirovanie issledovano v zavisimosti ot velichiny dozy, molekulyarnogo vesa RMMA i temperatury izlucheniya. Pokazano, chto RMMA s malym molekulyarnym vesom bolee ehffektivno okislyaetsya do perekisi i privivaetsya pri obluchenii dozami v neskol'ko megarad, chem polimer so sravnitel'no bol'shim molekulyarnym vesom. Otmecheno takzhe, chto povyshenie temperatury primerno do temperatury perekhoda stekla v zhidkoe sostoyanie intensifitsiruet protsessy okisleniya do perekisej i privivaniya. Rezul'taty ob{sup y}asneny, iskhodya iz vliyaniya temperatury i molekulyarnogo vesa na podvizhnost' polimera i oskolochnye radikaly. (author)

  7. 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)

  8. 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)

  9. Dating of pre hispanic ceramics from the archaeological zone of Zoque by thermoluminescence method; Datacion de ceramica prehispanica de la zona arqueologica Zoque por el metodo de termoluminiscencia (TL)

    Energy Technology Data Exchange (ETDEWEB)

    Valdes, J.V. [UAEM, Facultad de Quimica, 50120 Toluca, Estado de Mexico (Mexico); Gonzalez, P.R.; Mendoza, D.; Tenorio, D. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico); Terreros, E. [Museo Templo Mayor, INAH, Seminario No. 8, Col. Centro, 06060 Mexico D.F. (Mexico); Ramirez, A. [Instituto de Geofisica, UNAM, 04510 Mexico D.F. (Mexico)

    2007-07-01

    Full text: The dating of pre hispanic ceramics resides permitting us to located them in a certain period of the history; allows us to verify it origin. The thermoluminescence is a technique that permits us to estimate the absolute age of the archaeological samples. The present work is directed in determining the age by the method of thermoluminescence of archaeological samples of the grotto of Concubac, located in the Serrana Region of Tabasco. To determine the mineralogical composition of the samples, analysis of diffraction of X rays and Energy Dispersive X-ray Spectroscopy (EDS) have been conducted. The radiation emitted by the ground where the samples were buried and the contribution of the cosmic radiation was measured with thermoluminescent dosimeters of LiF:Mg,Cu,P+PTFE. The feasibility of dating of the studied samples is broadly disputed in function of the contents of minerals, as well as the procedure and management of the sample. (Author)

  10. Validation of quantitative {sup 1}H NMR method for the analysis of pharmaceutical formulations; Validacao de metodo quantitativo por RMN de {sup 1}H para analises de formulacoes farmaceuticas

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Maiara da S. [Universidade de Sao Paulo (USP), Sao Carlos, SP (Brazil). Instituto de Quimica; Colnago, Luiz Alberto, E-mail: luiz.colnago@embrapa.br [Embrapa Instrumentacao, Sao Carlos, SP (Brazil)

    2013-09-01

    The need for effective and reliable quality control in products from pharmaceutical industries renders the analyses of their active ingredients and constituents of great importance. This study presents the theoretical basis of Superscript-One H NMR for quantitative analyses and an example of the method validation according to Resolution RE N. 899 by the Brazilian National Health Surveillance Agency (ANVISA), in which the compound paracetamol was the active ingredient. All evaluated parameters (selectivity, linearity, accuracy, repeatability and robustness) showed satisfactory results. It was concluded that a single NMR measurement provides structural and quantitative information of active components and excipients in the sample. (author)

  11. Influence of irradiation on the degradation speed of pre servants of sliced pineapple preserved by a combined method; Influencia de la irradiacion sobre la velocidad de degradacion de preservantes en rodajas de pina conservadas por metodos combinados

    Energy Technology Data Exchange (ETDEWEB)

    Garcia A, A; Castro, D; Espinosa, R; Gonzalez, E; Fernandez, L; Garcia R, M O

    1996-12-31

    In the fulfillment of this study, pineapple of the spanish red variety, cut in 1.0 - 1.5 cm slices, were used. The product was sunken in a saccharose syrup with the addition of sodium methabisulphite and potassium sorbate and packed in polyethylene bags and latter irradiated with 0.2 and KGy doses. The behavior of potassium sorbate with two addition levels is similar during storage at room temperature for the studied irradiation doses. The degradation process of sodium methabisulphite takes place almost totally at one month storage. Unlike of potassium sorbate there exist no meaning differences between sulfur dioxide in irradiated and nonirradiated samples.It is concluded that the irradiation process cause an increasing in the degradation of potassium sorbate basically at the beginning of the storage, while seems no exert some effect on the sodium methabisulphite degradation. (Author).

  12. Estimaciones de Prevalencia del VIH por Género y Grupo de Riesgo en Tijuana, México: 2006

    Science.gov (United States)

    Iñiguez-Stevens, Esmeralda; Brouwer, Kimberly C.; Hogg, Robert S.; Patterson, Thomas L.; Lozada, Remedios; Magis-Rodriguez, Carlos; Elder, John P.; Viani, Rolando M.; Strathdee, Steffanie A.

    2010-01-01

    OBJETIVO Estimar la prevalencia del VIH en adultos de 15-49 años de edad en Tijuana, México - en la población general y en subgrupos de riesgo en el 2006. METODOS Se obtuvieron datos demográficos del censo Mexicano del 2005, y la prevalencia del VIH se obtuvo de la literatura. Se construyó un modelo de prevalencia del VIH para la población general y de acuerdo al género. El análisis de sensibilidad consistió en estimar errores estándar del promedio-ponderado de la prevalencia del VIH y tomar derivados parciales con respecto a cada parámetro. RESULTADOS La prevalencia del VIH es 0.54%(N = 4,347) (Rango: 0.22%–0.86%, (N = 1,750–6,944)). Esto sugiere que 0.85%(Rango: 0.39%–1.31%) de los hombres y 0.22%(Rango: 0.04%–0.40%) de las mujeres podrían ser VIH-positivos. Los hombres que tienen sexo con hombres (HSH), las trabajadoras sexuales usuarias de drogas inyectables (MTS-UDI), MTS-noUDI, mujeres UDI, y los hombres UDI contribuyeron las proporciones más elevadas de personas infectadas por el VIH. CONCLUSIONES El número de adultos VIH-positivos entre subgrupos de riesgo en la población de Tijuana es considerable, marcando la necesidad de enforcar las intervenciones de prevención en sus necesidades específicas. El presente modelo estima que hasta 1 en cada 116 adultos podrían ser VIH-positivos. PMID:19685824

  13. Metodos estadisticos empleados en los articulos originales publicados sobre tabaquismo en cuatro revistas medicas espanõlas (1985-1996

    Directory of Open Access Journals (Sweden)

    García López José Antonio

    2000-01-01

    Full Text Available Fundamento: Siendo el tabaquismo un tema prioritario de investigación y habiéndose incrementado el uso de técnicas estadísticas en las publicaciones biomédicas, se describen las técnicas estadísticas utilizadas y se cuantifica la accesibilidad estadística en los artículos originales sobre tabaquismo publicados en cuatro revistas médicas españolas. Métodos: Estudio descriptivo retrospectivo de los 154 artículos originales sobre tabaquismo publicados en las revistas Atención Primaria, Medicina Clínica (Barcelona, Revista Española de Salud Pública y Revista Clínica Española, en el período de 1985 a 1996. Un único observador codificó las técnicas estadísticas en 14 categorías de acuerdo con la clasificación elaborada por Carré et al (1995 a partir de la clasificación establecida por Emerson y Colditz (1983. Para el estudio de la accesibilidad estadística se estableció como referencia el conocimiento de técnicas bivariables, hasta regresión lineal simple. Resultados: El 81,8% de los originales utilizaron la estadística inferencial. Las categorías estadísticas más frecuentemente utilizadas fueron las "Tablas de contingencia" (37,0%, "Estadística descriptiva" (18,2% y "Tablas de vida y análisis de supervivencia" (9,7%. Un lector familiarizado con técnicas bivariables tuvo acceso estadístico al 96,0% de los originales de Revista Española de Salud Pública, al 86,2% de Atención Primaria, al 66,7% de Medicina Clínica (Barcelona y al 33,3% de Revista Clínica Española. Este mismo lector tuvo acceso al 100% de los originales publicados en el trienio 1985-87 y al 68,1% en el 1994-96. Conclusiones: La utilización de técnicas estadísticas varía en función del tema y diseño de investigación, de la revista y del año de publicación. La disminución de la accesibilidad estadística hace necesario identificar el perfil del lector estándar en nuestro país para adaptar sus conocimientos a las exigencias de la

  14. Miotoxicidade por organofosforados Organophosphate myotoxicity

    Directory of Open Access Journals (Sweden)

    Maria J. Cavaliere

    1996-06-01

    Full Text Available Os organofosforados são um grupo de compostos químicos amplamente utilizados em agropecuária como inseticidas, ocasionando intoxicações acidentais em animais e humanos, e mesmo sendo utilizados em tentativas de suicídio. A toxicidade desses produtos decorre sobretudo de insuficiência cárdio-respiratória por compromentimento do sistema nervoso autônomo. Sabe-se que alguns destes compostos induzem em animais de experimentação e em humanos, uma miopatia caracterizada por degeneração de células musculares, comprometendo sobretudo a musculatura respiratória. Baseado no fato de que este comprometimento contribui para a piora da função respiratória, propõe-se um protocolo de avaliação rotineira de miotoxicidade por compostos organofosforados, através de uma bateria mínima e suficiente de colorações e reações histoquímicas para quantificação da necrose muscular. Utilizaram-se como modelo experimental, grupos de ratos albinos (Wistar intoxicados com o organofosforado paraoxon, com e sem antídotos (atropina ou pralidoxima. Verificou-se nos grupos tratados com paraoxon e paraoxon mais atropina, necrose de fibras musculares no diafragma, que atingia em determinadas áreas até 15% das fibras. No grupo tratado com paraoxon mais pralidoxima, a necrose foi mínima, evidenciando o papel mioprotetor deste último antídoto.Organophosphates comprise a group of chemical compounds extensively used in farming as insecticides, which cause accidental poisoning in animals and men and are also used in suicide attempts. The toxicity of these compounds is due especially to the cardiac and respiratory impairment in consequence of autonomic nervous system disorders. However, it is known that some of these products induce a myopathy in experimental animals and humans. This myopathy is characterized by muscle cell degeneration, involving above all the respiratory muscles. Based on the fact that this involvement certainly enhances the

  15. Scanning Study of 700 Livers Evaluation of Existing Diagnostic Procedures; Etude Scintigraphique de 700 Foies (Evaluation des Procedures Actuelles de Diagnostic); Issledovanie pecheni 700 bol'nykh s pomoshch'yu skennirovaniya; Exploracion Hepatica de 700 Pacientes (Evaluacion de los Metodos Actuales De Diagnostico); Exploracion Hepatica de 700 Pacientes (Evaluacion de los Metodos Actuales de Diagnostico)

    Energy Technology Data Exchange (ETDEWEB)

    Czerniak, P. [Radium and Isotope Institute, Government Hospital, Tel-Hashomer (Israel)

    1964-10-15

    regeneracion completa. 3. Despues de una derivacion porta-cava, la imagen del higado es mas pequena y la del bazo mas grande, incluso cuando el estado general es satisfactorio. 4. Los agentes citostaticos pueden ser momentaneamente eficaces para ciertas lesiones hepaticas difusas. 5. Ha ocurrido a veces que al explorar de nuevo una lesion dudosa esta ha aparecido como una lesion macroscopica o ha desaparecido totalmente. Por tanto, la epoca en que se efectua la exploracion puede afectar al diagnostico, . Conclusiones: 1. La exploracion hepatica puede considerarse como metodo muy util para el diagnostico clfnico, morfologico y topografico en hepatopatologia. 2. Los resultados pueden mejorarse: a) utilizando aparatos perfeccionados o tecnicas de exploracion estereoscopica, y b) estableciendo una eficaz colaboracion entre el clinico y el cirujano. (author) [Russian] Provodilis' klinicheskie issledovanija, laboratornye analizy, rentgenograficheskoe obsledovanie i skennirovanie pecheni 700 bol'nyh. Za bol'nymi bylo ustanovleno nabljudenie, i v bol'shinstve sluchaev v konechnom itoge diagnoz podtverdilsja. Takim obrazom byla dana ocenka provedennym issledovanijam. Skennirovanie pecheni proizvodilos' s pomoshh'ju bengal'skoj rozy i polivinilpirolidona, mechennyh zolotom-198 i jodom-131 . Pomimo klassicheskogo AR-metoda dlja opredelenija ra- dioizotopnyh kojefficientov pecheni primenjalis' special'nye metody, takie kak treh ili dvuhploskostnoe stereoskennirovanie i kombinirovannoe izotopnoe issledovanie s pomoshh'ju mechennoj zolotom-198 i jodom-131 bengal'skoj rozy. Bol'nye byli razdeleny na vosem' klinicheskih grupp, i sootvetstvenno proizvodilsja sbor i ocenka diagnosticheskih dannyh. Daetsja kratkoe izlozhenie rezul'tatov jetogo issledovanija. V kazhdoj klinicheskoj gruppe analizy provodilis' otdel'no. Naprimer, v 95%iz 65 sluchaev jehinokokkovoj bolezni byl obnaruzhen ogranichennyj uchastok porazhenija. Rentgenovskoe obsledovanie vyjavilo obizvestvlenie tol'ko v 35%jetih sluchaev

  16. Herida precordial por arma blanca

    Directory of Open Access Journals (Sweden)

    Marcelo F. Jiménez

    2005-04-01

    Full Text Available Varón de 42 años con esquizofrenia paranoide. Intento de suicidio con tres autolesiones por arma blanca (Fig. 1. Fue traído al hospital en estado consciente, taquicárdico, taquipneico y con tensión arterial (TA de 140/90 mmHg. Fue trasladado al quirófano, donde se practicó una toracotomía axilar izquierda sin extraer el arma. Durante la intervención se apreciaron tres heridas incisas, dos no penetrantes, hemotórax de 150 ml, herida pericárdica de 4 cm, sin lesiones cardíacas. La hoja del arma blanca penetraba a través del diafragma produciendo una herida incisa en el lóbulo hepático izquierdo (Fig. 2. Se extrajo el arma y se suturó la laceración hepática. El paciente fue trasladado el cuarto día a la Unidad de Psiquiatría.

  17. por láser

    Directory of Open Access Journals (Sweden)

    Mayra Garcimuño

    2013-01-01

    Full Text Available En el presente trabajo, la técnica Espectroscopia de plasmas producidos por láser (Laser-induced breakdown spectroscopy –LIBS– se aplicó a la determinación cuan- titativa de Na en agua natural dulce, de interés en agricultura para el estudio de la alcalinidad de aguas de regadío. Para efectuar el análisis, se prepararon soluciones con concentraciones conocidas del analito, se mezclaron con óxido de calcio y se compactaron en pastillas sólidas. Los plasmas se produjeron en aire a presión atmos- férica utilizando un láser pulsado Nd:YAG. Se construyó una curva de calibración y se calculó el límite de detección. Se analizaron muestras de agua natural y los resultados se compararon con los obtenidos mediante espectroscopia de absorción atómica. Se demostró la factibilidad del método para la determinación de Na en agua natural dulce.

  18. Osteomalacia inducida por tumor: hemangiopericitoma rinosinusal

    Directory of Open Access Journals (Sweden)

    Enriqueta M. Serafini

    2013-02-01

    Full Text Available La osteomalacia inducida por tumor es una rara enfermedad del metabolismo óseo caracterizada por el aumento en la excreción de fosfato a nivel renal seguido de hipofosfatemia. Es causada por agentes fosfatúricos producidos por determinados tumores. La resección total del tumor resulta en la completa reversión de las anormalidades bioquímicas, la desaparición de las manifestaciones clínicas y los hallazgos en los estudios por imágenes. Presentamos el caso de un varón de 61 años con cuadro clínico y laboratorio compatibles con osteomalacia oncogénica inducida por tumor mesenquimático de localización rinosinusal. En nuestro caso el diagnóstico histológico correspondió a una neoplasia de tipo vascular: hemangiopericitoma.

  19. Casipoemas por Navidad : (1969-2010)

    OpenAIRE

    Sena Medina, Guillermo

    2011-01-01

    PRESENTACIÓN AL AIRE DE LA POESÍA RELIGIOSA Y NAVIDEÑA DE GUILLERMO SENA MEDINA Constituye un gran honor hacer la presentación de Guillermo Sena Medina por un doble motivo; por la larga y sincera amistad que nos une desde hace muchos años al socaire de nuestra común afición por la Historia, como cronistas oficiales de nuestros municipios; y, sobre todo y particularmente, por su rica y profunda personalidad como hombre de letras, nacida de su aún más rica y profunda personalidad humana. A...

  20. ANÁLISIS ESTRUCTURAL Y MORFOLÓGICO DE PELÍCULAS DE NITRURO DE ALUMINIO OBTENIDAS POR DEPOSICIÓN DE LÁSER PULSADO

    Directory of Open Access Journals (Sweden)

    Jaime Andrés Pérez Taborda

    2010-01-01

    Full Text Available En este trabajo, se presentan los resultados preliminares de peliculas nanoestructuradas de nitruro de aluminio (AlN, que fueron depositadas con el metodo de deposicion por laser pulsado (PLD. Al efecto, se utilizo un laser Nd:YAG (¿É=1064nm, que impacto un blanco de aluminio de alta pureza (4N, en una atmosfera de nitrogeno. Se utilizaron como sustratos portaobjetos de vidrio, Si3N4 (100 y Si (100. El tiempo de deposicion fue de 15 minutos a una fluencia del laser 7 J/cm2 y a temperatura ambiente. El espesor de las peliculas fue de 50 nm medido con un perfilometro. Para estudiar la influencia del nitrogeno en las peliculas delgadas de AlN, se vario la presion del gas ambiente entre (3 y 4 mTorr. Igualmente se estudió la influencia del sustrato en las propiedades morfológicas de las películas delgadas de AlN. La nanoestructura de las películas se determinó mediante microscopia electrónica de barrido (SEM, y microscopia de fuerza atómica (AFM; la composición química, utilizando la técnica de espectroscopía de rayos X por dispersión de energía (EDX. La estructura cristalina fue estudiada con difracción de rayos X (DRX, para la película de 4 mTorr sobre un sustrato de Si3N4 (100, y se encontró una estructura policristalina con reflexiones de los planos (002, asociados a la estructura tipo wurtzita del AlN.

  1. Avaliacao da espessura medio-intimal em pacientes com doenca renal cronica nao dialitica: estudo prospectivo de 24 meses

    Directory of Open Access Journals (Sweden)

    Andrea Gaspar Marcos

    2014-03-01

    Full Text Available Introdução: O aumento da espessura média-intimal (EMI avaliada por ultrassom é um preditor de risco cardiovascular na população geral. Porém, em pacientes com doença renal crônica nos estágios iniciais, essa associação ainda não está bem estabelecida. Objetivo: Avaliar a associação EMI com a ocorrência de eventos cardiovasculares e mortalidade em pacientes nos estágios iniciais da doença renal crônica. Métodos: A análise post hoc de uma coorte de pacientes nos estágios 2-4 da DRC. Foram avaliados dados laboratoriais, ultrassom da artéria carótida e tomografia coronariana no início do estudo e a ocorrência de óbito, em seguimento por 24 meses. Resultados: Um total de 117 pacientes (57 ± 11 anos, 61% sexo masculino foram avaliados. A taxa de filtração glomerular foi 36 ± 17 mL/min, 96% dos pacientes eram hipertensos, 23% diabéticos e 27% obesos. Calcificação arterial coronariana esteve presente em 48% dos pacientes, sendo mais prevalente em pacientes nos estágios mais avançados da DRC (p = 0,02. EMI foi 0,6 mm (0,4-0,7 mm. Comparado aos pacientes com EMI < 0,6mm, aqueles com EMI ≥ 0,6 mm eram mais velhos (p = 0,001, apresentavam maior prevalência do sexo masculino (p = 0,001, menor taxa de filtração glomerular (p = 0,01 e maior proporção de pacientes com calcificação (p = 0,001. Não foi observada relação entre a espessura média-intimal e a ocorrência de evento cardiovascular e óbito. Conclusão: A espessura médio-intimal em pacientes DRC se associou à calcificação coronariana, mas não à ocorrência de eventos cardiovasculares e óbito, em um seguimento de 24 meses.

  2. Hematoquecia letal por angiostrongilosis abdominal

    Directory of Open Access Journals (Sweden)

    Gerzain Rodríguez

    2000-06-01

    Full Text Available Una niña indigena de 4 años de edad, procedente de Carurú, Vaupés, un municipio semiselvático de 2.000 habitantes, presentó hematoquecia repetida con sincope y muerte 4 días después, a pesar de recibir transfusiones sanguíneas. El estudio postmortem descubrió dos masas de 3-4 cm de diámetro en el ileon distal que, al microscopio, correspondieron a inflamación severa de toda la pared intestinal, rica en eosinofilos y en granulomas con células gigantes que circunscribian y fagocitaban huevos y larvas de Angiostrongylus costaricensis, helminto situado también dentro de las arterias de la submucosa, vasos que presentaban engrosamiento de la intima y focos con inflamación granulomatosa con eosinófilos. La niña no presentó leucocitosis ni eosinofilia. Este es el segundo caso de angiostrongilosis de esta región. El primero fue el de una mujer indigena de 34 años también con hematoquecia anemizante. La angiostrongilosis abdominal se diagnosticó por primera vez en Colombia en 1979, en un niño de 5 años, de Dagua, Valle. La niña aquí presentada es el sexto paciente con esta entidad en Colombia. La hematoquecia como manifestación predominante de la angiostrongilosis es extraordinaria para una enfermedad parasitaria; se ha registrado solamente en tres ocasiones anteriores. La abundancia de cristales de Charcot-Leyden, que se tiñen muy bien con la coloración de Ziehl-Neelsen o de Fite-Faraco, en los infiltrados de la pared intestinal. sugiere que su búsqueda en las heces puede ser una ayuda en el diagnóstico de casos sospechosos. pues, los huevos y las larvas no se eliminan en las heces y el diagnóstico definitivo de la angiostrongilosis es histopatológico. Revisamos las caracteristicas clinicas, parasitológicas e histopatológicas de esta parasitosis que será más prevalente en Colombia a medida que los médicos. especialmente los patólogos, la conozcan mejor.

  3. New processing techniques for radioisotopes at Oak Ridge National Laboratory; Production de radioisotopes: nouvelles techniques employees au Laboratoire national d'Oak Ridge; Novye tekhnologicheskie metody polucheniya radioizotopov v Okridzhskoj natsional'noj laboratorii; Nuevos metodos de preparacion de radioisotopos aplicados en el Oak Ridge National Laboratory

    Energy Technology Data Exchange (ETDEWEB)

    Butler, T A; Lamb, E; Rupp, A F [Oak Ridge National Laboratory, Oak Ridge, TN (United States)

    1962-01-15

    une activite de 235 c/g. La poudre a ete comprimee en pastilles, que l'on a ensuite agglomerees pour leur donner une consistance ceramique. Le prometheum-147 a ete produit en quantites de l'ordre du kilocurie par combinaison des techniques de precipitation et d'echanges d'ions. Un procede d'extraction par solvant pour separer le prometheum-147 d'autres terres rares a ete experimente sur de tres faibles quantites. Quelques grammes de technetium-99 ont ete recuperes dans les produits de fission des effluents par precipitation et extraction par solvant combinees. Le technetium avait une purete chimique superieure a 99,9% et une purete radiochimique superieure a 99,99%. La purification du strontium-90 par elimination des contaminants les plus importants, a l'aide d'un systeme d'extraction continu par solvant, a ete demontree sur de tres petites quantites. En partant d'un produit contenant 95% de calcium inerte, on a obtenu du strontium a 98% de purete. On a ensuite traite le strontium-90 pour obtenir des elements ceramiques de titanate de strontium. (author) [Spanish] Entre los adelantos mas recientes introducidos en el programa de preparacion de radioisotopos del Oak Ridge National Laboratory se cuenta el desarrollo de nuevos metodos y el mejoramiento de procedimientos ya establecidos para la obtencion de cerio-144, promecio-147, tecnecio-99 y estroncio-90. Se ha producido experimentalmente cerio-144 en escala de los kiloeuries. Se recupero mas del 98% de cerio con una pureza superior al 99%. Este cerio se siguio purificando hasta obtener oxido de cerio puro en forma pulverulenta de actividad especifica igual a 235 e/g. Este polvo se comprimio en pastillas y se sinterizo para obtener un material ceramico denso. El promecio-147 se obtuvo en cantidades de kiloeuries aplicando un metodo combinado de precipitacion e intercambio ionico. Se ensayo la extraccion de vestigios de elementos con disolventes para separar el promecio-147 de otras tierras raras. Gracias a una

  4. Encefalopatía por priones

    Directory of Open Access Journals (Sweden)

    Carlos Colegial

    1999-01-01

    Full Text Available Las encefalopatías espongiformes por priones son enfermedades neurodegenerativas que pueden ser esporádicas o transmisibles, ya sea por mecanismos infecciosos o hereditarios. Su investigación ha planteado enormes retos y en el recorrido histórico en busca de su causa dos médicos han recibido el premio Nobel de Medicina: Carleton Gajdusek, por sus trabajos en Nueva Guinea donde describió la transmisión infecciosa por ritos canibalísticos, que llevó a estudios de transmisión experimental en chimpancés y a su teoría de los "virus lentos" (por el largo período de incubación de la enfermedad.

  5. Evaluation of standard and use tendency of image diagnosis exams in Brazil with emphasis in pediatric computerized tomography; Avaliacao do padrao e tendencia de uso de exames de diagnostico por imagem no Brasil com enfase em tomografia computadorizada pediatrica

    Energy Technology Data Exchange (ETDEWEB)

    Dovales, Ana Cristina Murta

    2016-07-01

    There is little information on developing countries about the use of diagnostic imaging procedures and the doses associated with radiological examinations. This study assessed the pattern and trend of diagnostic imaging usage in outpatients of the Brazilian Unified Health System (SUS) by modality and examined body part. Emphasis was given to computed tomography (CT) scans for which the analysis was extended to the private health care sector and included the evaluation of age at examination distribution, and dose estimation for children and young adults. Information on the use of diagnostic imaging procedures among SUS outpatients was obtained from the Outpatient Information System (SIA) of the Department of Information Technology of SUS (DATASUS). Data on the use of CT in the private health care sector were extracted from the Radiological Information Systems (RIS) of 25 private radiology services in 8 Brazilian cities. Effective doses and absorbed doses on organs of interest were estimated individually for 4,497 patients younger than 20 years of age using CT scan technical parameters and Monte Carlo simulations of radiation transport. Between 2002 and 2012 it was observed that conventional radiology was the most frequent modality of diagnostic imaging in SUS outpatients, but more sophisticated modalities, such as CT and magnetic resonance imaging, had the highest growth rates over the study period. The most frequent CT scan in SUS outpatients between 2001 and 2011 was the head/neck exam, but abdomen/pelvis examinations were the ones that grew the most. Patients up to 20 years of age made approximately 13% and 9% of the CT examinations between 2008 and 2014 in the public and private health care systems, respectively. About one-third of the private-sector patients had more than one CT scan in this period. There was great variation in doses, even for the same type of procedure in patients of the same age group. The highest mean effective dose was 13.5 mSv estimated for abdomen/pelvis CT in children younger than one year of age. The highest absorbed doses were estimated for the brain after head/neck CT (23.8 to 29.0 mGy), which was the most common type of CT in children and young adults in the study period. The intense increase, the magnitude of the estimated doses and the large proportion of pediatric CT scans in Brazil point out to the need for initiatives to promote appropriate justification and optimization of these examinations in Brazil. (author)

  6. Evaluation of the physico-chemical properties of nanocomposites of low density linear polyethylene and organophilic montmorillonite obtained by fusion; Avaliacao das propriedades fisico-quimicas de nanocompositos de polietileno linear de baixa densidade e montmorilonita organofilica obtidos por fusao

    Energy Technology Data Exchange (ETDEWEB)

    Arndt, Aline; Sandrin, Bianca M.; Pezzin, A.P.T., E-mail: anapezzin@yahoo.com.br [Universidade da Regiao de Joinville (UNIVILLE), SC (Brazil); Meier, Marcia M. [Universidade do Estado de Santa Catarina (UESC), Joinville, SC (Brazil). Departamento de Quimica; Balzer, Palova S. [Centro Universitario Unisociesc, Joinville, SC (Brazil). Departamento de Engenharia Mecanica; Tavares, Maria I.B. [Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, RJ (Brazil). Laboratorio de Solucoes em Ralaxometria

    2016-07-01

    In this project they were produced and characterized nanocomposite organoclay applied to linear low density polyethylene in order to improve their physicochemical properties. Samples were produced by means of extrusion and injection process, varying proportions of nanoclay (2; 2.5; 3.0 and 3.5%) in LLDPE. Samples nanocomposites were characterized by TGA, DSC and Flammability test (UL-94). The TGA analysis showed that adding nanoclay increased thermal stability, especially for LLDPE / OMMT2,0 sample increased thermal stability at 4.4%. By DSC it was found that samples with nanoclay incorporation did not affect the Tm of LLDPE, though the increase of nanoclay raised the degree of crystallinity of the samples 52.7% in LLDPE / 2.5 OMMT sample. The flammability results show that the sample LLDPE / OMMT 2.0 showed a decrease of 37.77% in the flame propagation velocity. The NMR showed that the samples up LLDPE / 2.5 OM has an exfoliated nanocomposite formation. (author)

  7. Assessment of influence of OSL dosimeters in the skin dose in radiotherapy: study for Monte Carlo simulation; Avaliacao da influencia de dosimetros OSL na dose na pele em radioterapia: estudo por simulacao Monte Carlo

    Energy Technology Data Exchange (ETDEWEB)

    Schuch, Franciely F.; Nicolucci, Patricia, E-mail: franschuch@yahoo.com.br [Universidade de Sao Paulo (USP), Ribeiraoo Preto, SP (Brazil)

    2017-11-01

    The interest in optically stimulated luminescence (OSL) dosimetry materials is growing due to its potential use in quality control in Radiotherapy. The use of these dosimeters for in vivo dosimetry, however, may influence the dose to the skin and deeper tissues in the patient. The goal of this study is to evaluate the influence of the OSL Al{sub 2}O{sub 3} material in dose deposited in the skin and deep in Radiotherapy. Monte Carlo simulation is used to evaluate this purpose when OSL dosimeters of Al{sub 2}O{sub 3} are positioned on the skin surface of the patient. Percentage depth dose curves for clinical beams of 6 and 10 MV were simulated with and without the presence of the dosimeter on the surface of a water phantom. The results showed a decrease of doses in regions close to the surface of the skin. In the build-up region, the maximum decreases of dose produced by the presence of the dosimeters were 52,5% and 47,5% for the 6 and 10 MV beams, respectively. After the build-up region, there are not significant changes in the doses for any of the used beams. The differences of doses found are due to the influence of the dosimetric material on the relative fluence of electrons near the end surface of the dosimeter. Thus, the results showed that the presence of the dosimetric material on the surface interferes on the skin dose. However, these dosimeters do not cause dose variations in depths of clinical interest, allowing its application in routine in vivo dosimetry in Radiotherapy. (author)

  8. Social environmental and economic evaluation diagnosis through application of MADSA (Social and Environmental Evaluation Matrix) customization; Diagnostico de desempenho socioambiental e economico por meio da customizacao da MADSA (Matriz para Avaliacao de Desempenho Socioambiental)

    Energy Technology Data Exchange (ETDEWEB)

    Ziliotto, Marco Aurelio B.; Villa, Alessandra T.; Padilha, Simone L. Vieira; Canaverde, Patricia Margue [Instituto ECOPLAN, General Carneiro, PR (Brazil); Sanqueta, Carlos Roberto [Universidade Federal do Parana (UFPR), Curitiba, PR (Brazil)

    2004-07-01

    The present paper reports a social, environment and economic diagnosis in an oil and energy organization, in the enlargement of its plant. Attending to some previous requirements made by this company, the diagnosis was accomplished making use of an innovative evaluation tool called MADSA{sup R} (Social and Environmental Evaluation Matrix). Through the customization of this tool, it was possible to evaluate, systematically, the performance of the engaged companies hired by the organization to implement its enterprise, based on proposed actions in QSMS - Quality, Safety, Environment and Health. The performance evaluation was supported by the employees', the organization, its clients' and the local community perception. MADSA{sup R} methodology made it possible to measure the accomplished gain through proposed actions. The development of a performance indicator allowed the comparison between achieved results and accomplished investments. It was concluded that MADSA{sup R} provided subsidies to elaborate an action plan to improve the organization achievements, since it was able to represent the strategy of the organization, to guide and standardize actions, to identify and quantify points to be made better of. (author)

  9. The use of dynamic computation systems in the evaluation of the damages caused by oil spill; O uso de sistemas computacionais dinamicos na avaliacao dos danos causados por derrames de petroleo

    Energy Technology Data Exchange (ETDEWEB)

    Barbosa, Luiz H.C.; Laurino, Luiz S.; Muelbert, Jose H. [Fundacao Universidade Federal do Rio Grande (FURG), RS (Brazil)

    2004-07-01

    Estuarine areas are zones of great environmental risk characterized as great sensitivity to oil and oil products spills. Traditionally, Geographic Information Systems (GIS) are used to evaluate these possible impacts. However, for some groups of organisms, like plankton, the spatial limitations of GIS become inadequate because their distributions exhibits temporal variability and are associated with dynamic environmental factors. Having this in mind, the development of a specific tool is necessary to supply this need. For the development of this tool, data of fish larvae and eggs (ichthyoplankton) from the Lagoa dos Patos Estuary (RS) were chosen as an initial group for the development of a Plankton Diagnostic System (SIDIPLA). These groups have an accentuated sensitivity to oil spills. This impact could directly affect the environment quality and indirectly the local fishing resource. SIDIPLA is elaborated from data reports covering every estuarine area and graphs are generated containing abundance of the species of fish larvae and eggs from the geographical position, season, temperature and salinity; selected by the user from an Internet page (http://corvina.lei.furg.br/sidipla). Several simulations demonstrated the strength of the system and its easy use. Furthermore this tool can be implemented in different places of the Brazilian coast and different groups of organisms. (author)

  10. Evaluation of oil and grease removal by adsorptive polymeric resins in semi-industrial scale: influence of temperature; Avaliacao da remocao de oleos e graxas por resinas polimericas adsorventes em escala semi-industrial: influencia da temperatura

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Luis F.S. de; Silva, Carla M.F. da; Queiros, Yure G.C.; 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)], e-mail: elucas@ima.ufrj.br

    2011-07-01

    The aim of this study was to evaluate the performance of polymeric resins packed in a fixed bed eluted in semi-industrial scale for oil and greases removal disposed in synthetic oily water in different temperature conditions. For this work, columns packed with vinyl and acryl polymer-base were tested and their efficiency of oil removal was evaluated by fluorimetry technique in two different temperatures: 25 and 60 deg C, in a flow rate condition of 200 mL/min. The experimental results were very good: the removal efficiencies were above 98% in both cases. At 60 deg C, the system keep the efficiency for a longer time: no significant loss in the efficiency was observed after eluting 1,000 times of the column bed volume at 25 deg C and 2,000, at 60 deg C. This result characterizes a great potential of application in the industry. (author)

  11. Evaluation of mercury contamination in sediments from Santos - Sao Vicente Estuarine system, in period of 1996 -2000; Avaliacao da contaminacao por mercurio dos sedimentos do Estuario Santos - Sao Vicente, no periodo de 1996-2000

    Energy Technology Data Exchange (ETDEWEB)

    Hortellani, Marcos Antonio

    2003-07-01

    The distribution of mercury contamination in the Santos - Sao Vicente Estuarine System was observed through the analysis of seventy seven surface sediments samples collected in two series. In different periods and points, since the Channel of Piacaguera, the head of the system, , through the estuarine arms of Santos and Sao Vicente as far as the Bay of Santos, about 30 Km downstream, and in different mangrove areas, including industrial and harbor influence zones. The obtained values ranged from 0.03 to 1.19 {mu}g g {sup -1} About 90% of the samples of the first series collected among 1997-1998 and 50% of the second series collected among 1999-2000 presented levels of Hg > 0,13 {mu}g g {sup -1} ,limit considered by the Canadian legislation and adopted by CETESB, below which doesn't happen adverse effect in the biological community. And about 35% of samples of the first series and 11 % of the second series presented concentrations of Hg > 0.698 {mu}g g {sup -1} probable level of occurrence of adverse effect in the biological community. These results indicate an increase of the mercury levels caused by the industrial, port and urban activities. The mercury concentration in sediments was determined by using an Atomic Absorption Spectrophotometer, coupling with a flow injection system by a cold vapor generation, using a manual injection valve (FIA-CVAAS). The estimate of the uncertainties associated to this procedure was calculated. The following elements were also determined: Fe, Al, Zn, Ni, Pb, Cd, Cr and Co in 46 samples of the second series, by atomic absorption spectrometry. In order to verify possible relationship among all the investigated elements in the samples sediments, was carried out a statistical study, using the SPSS-8.0 software. Pearson correlation and Principal Component's analysis were used for with the objective to identify of major relationship for additional exploration of the general behavior of the data. (author)

  12. Hyperbranched polyester: single route synthesis, characterization and evaluation as impact modifier of an epoxy resin; Poliester hiperramificado: sintese por uma rota simples, caracterizacao e avaliacao como modificador de impacto de uma resina epoxi

    Energy Technology Data Exchange (ETDEWEB)

    Miranda, B.H.S.; Sousa, A.R., E-mail: rangel@deii.cefetmg.br [Centro Federal de Educacao Tecnologica de Minas Gerais (DEMAT/CEFET-MG), Belo Horizonte (Brazil). Departamento de Engenharia de Materiais; Alves, A.P.P.; Silva, G.G. [Universidade Federal de Minas Gerais (UFMG), Belo Horizonte (Brazil). Departamento de Quimica. Lab. de Materiais Polimericos Multicomponentes

    2015-07-01

    Two hyperbranched polyesters were obtained using glycerol and adipic acid as monomers, they were characterized through nuclear magnetic resonance ({sup 13}C NMR) to branching degree determination, size exclusion chromatography to molar mass obtention and thermogravimetric analysis (TGA) to evaluate the thermal stability. The polyesters synthesized were added to epoxy resin, at 10% by weight, to evaluate the implication on mechanical properties, impact and stress strain, and thermal (glassy transition temperature - Tg). We observed that rising the synthesis time from 6 to 15,5 hours the degree of branching, molar mass and thermal stability of the polyester increased. The addition of hyperbranched polyesters did not change the mechanical properties of epoxy resin significantly, but the Tg was reduced. (author)

  13. Evaluation of demand for water and electricity for papaya micro sprinkler irrigation system in Paraiba state, Brazil; Avaliacao das demandas de agua e energia eletrica para mamao irrigado por microaspersao no estado da Paraiba

    Energy Technology Data Exchange (ETDEWEB)

    Lopes, Riuzuani Michelle Bezerra Pedrosa; Dantas Neto, Jose; Farias, Soahd Arruda Rached Farias; Azevedo, Carlos Alberto Vieira de [Universidade Federal de Campina Grande (UAEAG/UFCG), PB (Brazil). Centro de Tecnologia e Recursos Naturais. Unidade Academica de Engenharia Agricola], Emails: riuzuani@yahoo.com.br, zedantas@deag.ufcg.edu.br, soahd_rached@hotmail.com, cazevedo@deag.ufcg.edu.br

    2010-07-01

    This study aimed to conduct an assessment on the demands for water and electricity for fruit irrigated by micro sprinkler irrigation in agricultural planning. We obtained the demands of gross water and electricity for papaya in 15 municipalities spread over the Rio Paraiba-PB, which was used by micro irrigation system with 90% application efficiency. The city of Joao Pessoa is the place to lower water consumption, requiring 32.9% of the amount required for papaya in Exile, which had the highest annual and daily evapotranspiration, combined with the lowest annual rainfall likely at a 75 % probability. The municipalities were chosen because they had a greater variance in terms of climate, in order to examine various irrigation demands. In Exile is a necessary volume of water-to 8.006,9 m{sup 3}.ha{sup -1}.year{sup -1} to produce one hectare of papaya while in Joao Pessoa need to 2.712,89 m{sup 3}.ha-1.year{sup -1}. The consumption of electricity in the city of Desterro is higher among the cities studied, necessitating 2.009,0 kW.ha{sup -1}.ano{sup -1} to produce one hectare of papaya, while in Joao Pessoa we only need 876,54 kW.ha {sup -1}.ano{sup -1} (author)

  14. Computed tomography prospective study of pleural-pulmonary changes after abdominal surgery : assessment of associated risk factors; Estudo prospectivo por tomografia computadorizada das alteracoes pleuro-pulmonares apos cirurgia abdominal: avaliacao dos fatores de risco associados

    Energy Technology Data Exchange (ETDEWEB)

    Rossi, Luis Antonio [Pontificia Univ. Catolica de Sao Paulo, SP (Brazil). Centro de Ciencias Medicas e Biologicas]. E-mail: luizrossimd@uol.com.br; Bromberg, Sansom Henrique [Instituto de Assistencia Medica ao Servidor Publico Estadual de Sao Paulo (IAMSPE), Sao Paulo, SP (Brazil). Curso de Pos-graduacao em Gastroenterologia Cirurgica

    2005-07-01

    Postoperative pleural-pulmonary changes (PPC) are very common following elective abdominal surgery, resolving without clinical manifestations in most patients. The incidence and risk factors associated are unknown. Objective: to determine the incidence of PPC and possible association with risk factors using computerized tomography (CT). Material and method: thirty seven patients submitted to elective abdominal surgery were prospectively analyzed using CT performed in the preoperative period and 48 hours after surgery. The PPC was scored from 0 to III. The risk factors evaluated were: age, sex, obesity, smoking history, alcoholism, comorbid conditions, cancer, ASA classification, duration of surgery, surgical incision type and number of days of hospitalization. Results: Pleura effusion was detected by CT in 70.3% (26/37) of the patients and pulmonary atelectasis in 75.5% (28/37). Grade I and II PPC was found in 59.5% (22/37) of the patients and grade III in 21.6% (8/37). Two (5.4%) of these patients developed serious pulmonary complications whereas one patient died. Surgery due to cancer, class ASA >2, longitudinal incision and > 15 cm showed statistical significance and were associated with pleural effusion. The hospitalization was over 2.4 longer for patients with PPC. Conclusion: PPC is frequently seen in patients submitted to abdominal surgery. The use of the CT for the detection of pulmonary atelectasis and pleural effusion proved to be effective. Most cases of PPC are self-limited, resolving without symptoms. (author)

  15. Response pattern's of immunoglobulins evaluation in different lineages of mice infected with T. cruzi; Avaliacao do padrao de resposta de imunoglobulinas em diferentes linhagens de camundongos frente a infeccao por T.cruzi

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Andreia dos Santos

    2006-07-01

    The present work has employed different mice lineages (A/J, C57BL/6, B6AF1, BXA1 and BXA2) that were challenged with different doses of T. cruzi. The objective was to evaluate the pattern of immunoglobulins response presented by resistant and susceptible mice to T. cruzi as well as the lineages developed from the matting between them. So that evaluation was done by using lineages serums' sample, analyzed by ELISA's method. In agreement with the results observed all the lineages presented higher response to IgG2a and IgG2b, if compared with the titles to IgG1. IgG1 immunoglobulins involve a type Th2 pattern response which expressed allergic immunological responses, while IgG2 involves a pattern response Th1 that expresses cellular immunological response. The different lineages used in this research also presented different immunological response pattern by the infection with T. cruzi. Mice of the lineage C57BL/6 are resistant to the infection, while the animals of the lineage A/J are susceptible. The animals of the lineage B6AF1 are more resistant to the infection than their original parental C57BL/6. The immunological response developed by hybrid mice present traces of both susceptible and resistant parental A/J and C57BL/6, respectively. The animals of the lineage BXA1 can be considered resistant to the infection, but they don't present the same control as that presented by those of the lineages B6AF1 and C57BL/6. The animals of the lineage BXA2 can be considered susceptible to the infection, but they can control it for a long period, surviving like this, longer than the animals of the lineage A/J. In addition it was observed that the IgG2b immunoglobulins are very important to the resistance of mice to T. cruzi infection. (author)

  16. Evaluation of the contamination risk by {sup 241}AM from lightning rods disposed at uncontrolled garbage dump; Avaliacao da contaminacao provocada por para-raios radioativos de americio-241 descartados em lixoes

    Energy Technology Data Exchange (ETDEWEB)

    Marumo, Julio Takehiro

    2006-07-01

    Radioactive lightning rods were manufactured in Brazil until 1989, when the licenses for using radioactive sources in these products were lifted by the national nuclear authority. Since then, radioactive devices have been replaced by Franklin type one and collected as radioactive waste. However, only 23 percent of the estimated total number of installed rods was delivered to Brazilian Nuclear Commission (Comissao Nacional de Energia Nuclear - CNEN). This situation is of concern as there is a possibility of the rods being discarded as domestic waste, considering that in Brazil, 63.6 percent of the municipal solid waste is disposed at uncontrolled garbage dump, according to Instituto Brasileiro de Geografia e Estatistica (IBGE) in 2000. In addition, americium, the most common employed radionuclide, is classified as a high toxicity element, when ingested or inhaled. In the present study, it was performed migration experiments of Am-241 by lysimeter system in order to evaluate the risk of contamination caused by radioactive lightning rods disposed as a common solid waste. Sources removed from lightning rods were placed inside lysimeters filled with organic waste, collected at the restaurant of Instituto de Pesquisas Energeticas e Nucleares, IPEN-CNEN/SP, and the generated leachate was periodically analyzed to determine its characteristics such as pH, redox potential, solid content and concentration of the radioactive material. Microbial growth was also evaluated by counting the number of colony forming units. The equivalent dose to members of the public has been calculated considering the ingestion of drinking water, the most probable mode of exposure. The final result was about 145 times below the effective dose limit of 1 mSv.year-1 for members of the public, established by the International Commission on Radiological Protection (ICRP), demonstrating that the risk caused by lightning rods disposed at uncontrolled garbage dump is low. (author)

  17. Evaluation of the susceptibility to corrosion by pites of supermartensitic stainless steel with different superficial finishing; Avaliacao da susceptibilidade a corrosao por pites do aco inoxidavel supermartensitico com diferentes acabamentos superficiais

    Energy Technology Data Exchange (ETDEWEB)

    Freitas, Mario Jose Bueno de Souza

    2015-07-01

    The objective of this study is to evaluate the susceptibility by pitting corrosion in a supermartensitic stainless steel (13%Cr) with different surface finishes, in an environment that simulates the conditions found in the range of the Brazilian marine subsoil before the dense layer of salt - the so-called pre-salt. In this study were conducted electrochemical tests of potentiodynamic anodic polarization and electrochemical impedance spectroscopy (EIS) in environment containing 35, 50 and 190 g/L of NaCl and dissolved oxygen concentrations <10, 100 and 500ppb. Were also used the techniques of Moessbauer spectroscopy and EDS (Energy Dispersive Spectrometry) coupled to a scanning electron microscope (SEM) for microstructural characterization of 13%Cr steel. It was observed by the electrochemical tests, the increase in the concentration of chloride ions in solution makes the studied steel more susceptible to localized corrosion. It was also observed that the material showed less susceptibility to pitting corrosion when its surface was less rough. (author)

  18. Combined discrete nebulization and microextraction process for molybdenum determination by flame atomic absorption spectrometry (FAAS); Avaliacao da combinacao da nebulizacao discreta e processos de microextracao aplicados a determinacao de molibdenio por espectrometria de absorcao atomica com chama (FAAS)

    Energy Technology Data Exchange (ETDEWEB)

    Oviedo, Jenny A.; Jesus, Amanda M.D. de; Fialho, Lucimar L.; Pereira-Filho, Edenir R., E-mail: erpf@ufscar.br [Universidade Federal de Sao Carlos (UFSCar), SP (Brazil). Departamento de Quimica

    2014-04-15

    Simple and sensitive procedures for the extraction/preconcentration of molybdenum based on vortex-assisted solidified floating organic drop microextraction (VA-SFODME) and cloud point combined with flame absorption atomic spectrometry (FAAS) and discrete nebulization were developed. The influence of the discrete nebulization on the sensitivity of the molybdenum preconcentration processes was studied. An injection volume of 200 μ resulted in a lower relative standard deviation with both preconcentration procedures. Enrichment factors of 31 and 67 and limits of detection of 25 and 5 μ L{sup -1} were obtained for cloud point and VA-SFODME, respectively. The developed procedures were applied to the determination of Mo in mineral water and multivitamin samples. (author)

  19. Evaluation of natural rubber from IAC series clones by solid state {sup 13}C NMR; Avaliacao da borracha natural de clones da serie IAC por {sup 13}C RMN no estado solido

    Energy Technology Data Exchange (ETDEWEB)

    Martins, Maria A.; Moreno, Rogerio M.B.; Goncalves, Paulo S. [Instituto Agronomico de Campinas, SP (Brazil). Centro de Cafe e Plantas Tropicais. Programa Seringueira]. E-mails: paulog@iac.sp.gov.br; mariaalice@cnpdia.embrapa.br; Forato, Lucimara A.; Colnago, Luiz A.; Mattoso, Luiz H.C. [EMBRAPA Instrumentacao Agropecuaria, Sao Carlos, SP (Brazil)]. E-mail: colnago@cnpdia.embrapa.br; forato@cnpdia.embrapa.br; rogerio@cnpdia.embrapa.br; mattoso@cnpdia.embrapa.br; Job, Aldo E. [Universidade Estadual Paulista (UNESP), Presidente Prudente, SP (Brazil). Departamento de Fisica, Quimica e Biologia

    2005-07-01

    Agronomic Institute (IAC) and EMBRAPA Agricultural Instrumentation (EMBRAPA/CNPDIA) have been studied Hevea species in order to increase the production of the natural rubber and to develop new clones more appropriated to Brazil's soil and climate. Structural characterization of natural rubber [Hevea brasiliensis (Willd. ex Adr. de Juss.) Muell. - Arg.] from new clones of the IAC series (IAC 300, 301, 302, 303, 35, 40, and 56) and from RRIM 600 clone has been studied by high-resolution solid-state {sup 13}C NMR and by single pulse technique. The results have shown that the application of solid-state {sup 13}C NMR using the single pulse technique is a powerful tool to study natural rubber. The spectra obtained through this technique confirmed that natural rubber from all clones studied are cis-1,4-polyisoprene (author) form.(author)

  20. Evaluation of rheological behavior and sensory properties of ready to eat salad dressings submitted to irradiation; Avaliacao do comportamento reologico e das propriedades sensoriais de molhos comerciais para salada tratados por irradiacao

    Energy Technology Data Exchange (ETDEWEB)

    Gallo, Juliana Maria Altavista Sagretti

    2013-08-01

    This study evaluated the rheological behavior of 11 salad dressings ready to eat, processed by gamma irradiation, at doses: 3 kGy and 5 kGy. This assessment was made by rheograms traced by measurements of viscosity and shear stress by shear rate. Mathematical parameters obtained from these measures also contributed to the conclusion of the behavior exhibited and for choosing the best mathematical model applicable to them. The measurements were performed on a Brookfield viscometer Model LVDV - III. The Neslab thermal bath was used to maintain ambient temperature during the whole analysis. This study protocol was done in two stages. In step 1, the evaluation was performed soon after the samples have been irradiated when these were close to their dates of manufacture. In phase 2 the samples were reassessed after a period of storage, near the expiration date of their validity. Simultaneously pH measurement was performed to evaluate their stability in the face of treatment and sensory analyzes of two salad dressings were studied, in order to verify the acceptance of these when submitted to irradiation. The shear-thinning behavior was confirmed for all dressings through the mathematical model, the power law, that best model apply to this, in both phases. The irradiation at the absorbed doses studied did not influence this behavior. The results of sensory evaluation indicated good acceptance of irradiated sauces for the tasters. (author)

  1. 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.

  2. Evaluation of Portland cement from X-ray diffraction associated with cluster analysis; Avaliacao de cimento Portland a partir da difracao de raios X associada a analise por agrupamento

    Energy Technology Data Exchange (ETDEWEB)

    Gobbo, Luciano de Andrade, E-mail: luciano.gobbo@panalytical.com [Panalytical Brasil, Sao Paulo, SP (Brazil); Montanheiro, Tarcisio Jose, E-mail: tarcisio.montanheiro@gmail.com [Instituto Geologico, Secretaria de Estado do Meio Ambiente, Sao Paulo, SP (Brazil); Montanheiro, Filipe, E-mail: flpmontanheiro@gmail.com [Universidade Estadual Paulista (LEBAC/UNESP), Rio Claro, SP (Brazil). Departamento de Geologia Aplicada. Lab. de Estudos de Bacias; Sant' Agostino, Lilia Mascarenhas, E-mail: agostino@usp.br [Universidade de Sao Paulo (USP), SP (Brazil). Instituto de Geociencias. Departamento de Geologia Sedimentar e Ambiental

    2013-12-15

    The Brazilian cement industry produced 64 million tons of cement in 2012, with noteworthy contribution of CP-II (slag), CP-III (blast furnace) and CP-IV (pozzolanic) cements. The industrial pole comprises about 80 factories that utilize raw materials of different origins and chemical compositions that require enhanced analytical technologies to optimize production in order to gain space in the growing consumer market in Brazil. This paper assesses the sensitivity of mineralogical analysis by X-ray diffraction associated with cluster analysis to distinguish different kinds of cements with different additions. This technique can be applied, for example, in the prospection of different types of limestone (calcitic, dolomitic and siliceous) as well as in the qualification of different clinkers. The cluster analysis does not require any specific knowledge of the mineralogical composition of the diffractograms to be clustered; rather, it is based on their similarity. The materials tested for addition have different origins: fly ashes from different power stations from South Brazil and slag from different steel plants in the Southeast. Cement with different additions of limestone and white Portland cement were also used. The Rietveld method of qualitative and quantitative analysis was used for measuring the results generated by the cluster analysis technique. (author)

  3. Study of uptake and endocytosis of gamma rays-irradiated crotoxin by mice peritoneal macrophages; Avaliacao do mecanismo de captacao e endocitose de crotoxina submetida a acao da radiacao, por macrofagos peritoneais de camundongos

    Energy Technology Data Exchange (ETDEWEB)

    Cardi, Bruno Andrade

    1999-07-01

    The purpose was to investigate the uptake and endocytosis of 2000 Gy {sup 60}Co irradiated crotoxin through mouse peritoneal macrophages, correlating with native one and another non related protein, the ovalbumin. Native (CTXN) or 2000 Gy {sup 60} Co {gamma}-rays (dose rate 540 Gy/hour) irradiated crotoxin (CTXI) or ovalbumin processed of same manner (OVAN - OVAI) were offered to mouse peritoneal macrophages and their uptake was evaluated by immunohistochemistry and quantitative in situ ELISA. The involvement of scavenger receptors (ScvR) was evaluated by using blockers drugs (Probuco-PBC or Dextran Sulfate - SD) or with nonspecific blocking using fetal calf serum (FBS). The morphology and viability of macrophages were preserved during the experiments. CTXI showed irradiation-induced aggregates and formation of oxidative changing were observed on this protein after gamma rays treatment. By immunohistochemistry we could observe heavy stained phagocytic vacuole on macrophages incubated with CTXI, as compared with CTXN. Quantitatively by in situ ELISA, the sema pattern was observed, displaying a 2-fold CTXI incorporation. In presence of PBC or SD we could find a significant decrease of CTXI uptake but not of CTXN. However the CTXN uptake was depressed by FBS, not observed with CTXI. OVA, after gamma rays treatment, underwent a high degradation suffering a potent incorporation and metabolism by macrophages, with a major uptake of OVAI in longer incubation (120 minutes). Gamma rays ({sup 60} Co) produced oxidative changes on CTX molecule, leading to a uptake by ScvR-mice peritoneal macrophages, suggesting that the relation antigen-presenting cells and gamma rays-modified proteins are responsible for the better immune response presented by irradiated antigens. (author)

  4. Response pattern's of immunoglobulins evaluation in different lineages of mice infected with T. cruzi; Avaliacao do padrao de resposta de imunoglobulinas em diferentes linhagens de camundongos frente a infeccao por T.cruzi

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Andreia dos Santos

    2006-07-01

    The present work has employed different mice lineages (A/J, C57BL/6, B6AF1, BXA1 and BXA2) that were challenged with different doses of T. cruzi. The objective was to evaluate the pattern of immunoglobulins response presented by resistant and susceptible mice to T. cruzi as well as the lineages developed from the matting between them. So that evaluation was done by using lineages serums' sample, analyzed by ELISA's method. In agreement with the results observed all the lineages presented higher response to IgG2a and IgG2b, if compared with the titles to IgG1. IgG1 immunoglobulins involve a type Th2 pattern response which expressed allergic immunological responses, while IgG2 involves a pattern response Th1 that expresses cellular immunological response. The different lineages used in this research also presented different immunological response pattern by the infection with T. cruzi. Mice of the lineage C57BL/6 are resistant to the infection, while the animals of the lineage A/J are susceptible. The animals of the lineage B6AF1 are more resistant to the infection than their original parental C57BL/6. The immunological response developed by hybrid mice present traces of both susceptible and resistant parental A/J and C57BL/6, respectively. The animals of the lineage BXA1 can be considered resistant to the infection, but they don't present the same control as that presented by those of the lineages B6AF1 and C57BL/6. The animals of the lineage BXA2 can be considered susceptible to the infection, but they can control it for a long period, surviving like this, longer than the animals of the lineage A/J. In addition it was observed that the IgG2b immunoglobulins are very important to the resistance of mice to T. cruzi infection. (author)

  5. Evaluation of solubility in simulated lung fluid of metals present in the sludge from a metallurgical industry to produce metallic zinc; Avaliacao da solubilidade em liquido pulmonar simulado dos metais presentes no rejeito gerado por uma industria metalurgica de zinco

    Energy Technology Data Exchange (ETDEWEB)

    Lima, Rosilda Maria Gomes de

    2012-07-01

    The objective of this study was to determine the solubility parameters (rapid and slow dissolution rates, rapid and slow dissolution fractions) metal particles present in a pile of sludge accumulated under exposure to weathering from the Cia Mercantil Inga, located at the Ilha da Madeira, Sepetiba Bay, Rio de Janeiro. Plant samples collected in the neighboring of the pile and bioindicators placed in the region and collected after some months indicated that the inhabitants of Ilha da Madeira have been exposed to trace elements such zinc, cadmium, mercury and lead, produced during the processing of zinc minerals (hemimorphite - Zn{sub 4}(OH){sub 2}Si{sub 2}O{sub 7}.H{sub 2}O, and willemite - Zn{sub 2}SiO{sub 4}). A static dissolution test in vitro was used to determine the solubility parameters using a simulated lung fluid (SLF), on a time basis ranging from 10 min to 1 year. The metal concentrations in the sludge samples and in the SLF were determined using Particle Induced X-rays Emission (PIXE). In conclusion, this study confirms the harmful effects on the neighboring population of the airborne particles containing these metals that came from the sludge. The solubility parameters obtained for Zn, Cd, Cr, Ni and Mn present in the rapid dissolution fraction in SLF were 0.945; 0.473; 0.226; 0.300 and 0.497, respectively, and the corresponding times for half life of dissolution of the rapid fraction were f{sub r} = 2.082 days; f{sub r} = 0.09 days; f{sub r} = 0.37 days; f{sub r} = 0.332 days ad f{sub r} = 0.99 days; for the slow dissolution fraction times were f{sub r} = 146.95 days; f{sub r} = 63 days; f{sub r} = 86.64 days; f{sub r} = 79.66 days and f{sub r} = 59.84 days. These values indicate that these metals present a moderate absorption level in SLF, and may be classified as M type, according to the International Commission on Radiological Protection (ICRP). The use of solubility parameters allowed a better description of the kinetic behaviour of the sludge in the human body and, therefore, a better evaluation of the worker’s risk to inhalation of airbone particles containing Zn, Cd, Cr, Ni and Mn. (author)

  6. Evaluation of ensemble atmospheric simulations in oil dispersion models at Itaguai Port region; Avaliacao do uso de resultados numericos de previsao atmosferica por conjunto na modelagem da dispersao de oleo na regiao do Porto de Itaguai

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Renato Goncalves dos; Silva, Mariana P.R.; Silva, Ricardo Marcelo da; Torres Junior, Audalio R. [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil). Lab. de Modelagem de Processos Marinhos e Atmosfericos (LAMMA); Landau, Luiz [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil). Lab. de Metodos Computacinais em Engenharia (LAMCE); Sa, Reginaldo Ventura de; Hochleitner, Fabio; Correa, Eduardo Barbosa [AQUAMET Meteorologia e Projeto de Sistemas, Rio de Janeiro, RJ (Brazil)

    2008-07-01

    This work discusses the use of numerical prediction using ensemble as boundary condition in pollutants dispersion models, applied in a hypothetical case of an oil spill occurrence in Itaguai Port. The Princeton Ocean Model (POM) has been used to simulate hydrodynamics and NICOIL Eulerian model to forecast oil spill dispersion, and ensemble wind forecast from Global Forecast System (GFS), aiming to assess the importance of this parameter variability in oil dispersion at sea. The wind scenarios using ensemble members has showed significant dispersion when compared to control simulation, demonstrating that the uncertainty in the atmospheric modeling can generate considerable variations in the placement of the final spot of oil. The region of interest was the Sepetiba Bay, located on the southern coast of the Rio de Janeiro state; because of port operations carried out around the Port of Itaguai where they can, eventually, oil leaks occur. (author)

  7. Evaluation of ambient radiation levels in positron emission tomography/computed tomography in microPET/CT laboratory; Avaliacao dos niveis de radiacao ambiental no laboratorio de tomografia por emissao de positrons acoplada a tomografia computadorizada, microPET/CT

    Energy Technology Data Exchange (ETDEWEB)

    Sarmento, Daniele Martins

    2016-11-01

    Micro PET/CT scanner is an essential tool generally used for small animal molecular imaging. Fluorine-18-labeled fluorodeoxyglucose is the most widely used radioisotope in this technique. The present study aimed to evaluate the radiation levels in a micro PET/CT research laboratory of the Radiopharmacy Center at IPEN-CNEN / SP, in order to accomplish both national standards and international recommendations. The radioprotection team has classified the laboratory as supervised area; even this laboratory does not require the adoption of specific measures for protection and safety, should be done regular re-evaluation of the conditions of occupational exposures. Workplace monitoring and individual control assessment were carried out to ensure the radiological protection of all workers directly involved in handling the scanner. Initially, there was conducted a radiometric survey, as well as measurements of the external radiation level in the workplace and its surroundings. To achieve this goal, there were placed nine thermoluminescent dosimeters of CaSO{sub 4}:Dy in preselected locations. Monthly evaluations of the occupationally exposed individuals were carried out through the use of TL dosimeters, ported in the workers' chest. Moreover, whole body measurements were performed every six months. The study period was about two-years which started in April 2014. All tests to evaluate micro PET/CT performance were based on the standard protocol of the equipment in accordance with the standard developed by the Animal PET Standard Task Force. Present study's results demonstrated that the ambient radiation levels (ambient and effective estimated radiation dose), as well as the effective shielding equipment are both adequate. This study emphasizes that it is essential to strictly follow the principles of radioprotection in workplace, whenever researches involve radioactive unsealed sources. (author)

  8. Radiation effects evaluation for electrons sheaf in packages resistance in a Lasioderma serricorne, Plodia interpunctella and Sitophilus zeamais; Avaliacao dos efeitos da radiacao por feixe de eletrons na resistencia de embalagens a Lasioderma serricorne, Plodia interpunctella e Sitophilus zeamais

    Energy Technology Data Exchange (ETDEWEB)

    Alves, Juliana Nazare

    2011-07-01

    The plagues of stored products consist of a man problem, depreciating products and causing economical damages. Among these curses we have Lasioderma serricorne (F. 1792), Sitophilus zeamais (M. 1855) and Plodia interpunctella (H. 1813) known by infesting stored products as: grains, brans, flours, coffee, tobacco, dried fruits and spices. These curses perforate and penetrate the packages, ovipositing over the substratum. In this context the package plays a fundamental part, preventing the contact and curses' proliferation in the packed product. So, to protect the packed product and to prolong its shelf life, the package should have good mechanical resistance to tension and perforation, good sealing, good barrier properties and should not transfer odors nor strange flavors to the packed product. The ionizing radiation can cause structural changes in polymer packages, these changes are caused by the scission processes and reticulation of the polymers chains. These are concurrent processes and the predominance of one over the other depends on the chemical structure of the polymer, the irradiation conditions and specific factors of the material that will absorb the energy. This work had the objective to evaluate the changes in mechanical properties of package structures used to store granola, cereal bar and pasta, as well as its resistance to perforation by L. serricorne, P. interpunctella and S. zeamais, when submitted to electrons sheaf radiation. In this methodology were used five structures of commercially utilized packages to store granola, cereal bar and pasta composed by (Polypropylene bi-oriented metallic/Polypropylene bi-oriented coextruded - BOPPmet/BOPP 50 {mu}m), (Polypropylene bi-oriented/Polypropylene - BOPP/PP 50 {mu}m), Poli (ethylene terephthalate) metallic/Polypropylene bi-oriented coextruded - PETmet/BOPP 32 {mu}m), Poli (ethylene terephthalate) /Polypropylene - PET/PP1 72 {mu}m), Poli (ethylene terephthalate)/Polypropylene - PET/PP2 32 {mu}m). The structures of packaging were submitted to radiation doses between 0, 10, 20 and 60 kGy, in one electron accelerator of 1,5 M and V, 25 mA and 37,5 kW, dose tax of 11,22 kGy / s, room temperature and air presence . Eight days, Two and Six months after irradiations, mechanical resistance experiment were accomplished to tension and elongating in rupture, sealing resistance and perforation resistance, all based in respective ASTM norms. The perforation experiment by insects were realized in an acclimatized room, where irradiated samples in doses of 0, 10, 20 and 60 kGy were sealed containing 40 g of granola, 40 g of pasta and cereal bar in number of nine by experiment, and equally divided in three plastic screened boxes by studied dose. In each box 20 adults of each insect were added in for 60 days, when the packages were evaluated to verify possible perforations. The differences between the sample results were statistically evaluated by ANOVA (p<0.05). The results showed that concerning the perforation resistance by L. serricorne, P. interpunctella and S. zeamais the polymeric structures evaluated showed low resistance by insects perforation before and after the treatment. BOPPmet/BOPP (50 {mu}m), PETmet/BOPP (32 {mu}m), PET/PP1 (72 {mu}m) and PET/PP2 (32 {mu}m) structures showed significant losses in mechanical properties studied. The BOPP/PP (50 {mu}m) showed the best set of answers in mechanical properties to the radiation treatment with electrons sheaf up to 10 kGy doses. Among the mechanical properties evaluated, sealing was the most affected by ionizing radiation, has shown, in general, increasing losses with radiation dose. (author)

  9. Dose evaluation due to the effluent liberation by medical installations at city of Rio de Janeiro, Brazil; Avaliacao de doses devido a liberacao de efluentes por instalacoes medicas na cidade do Rio de Janeiro

    Energy Technology Data Exchange (ETDEWEB)

    Shu, Jane; Rochedo, Elaine R.R., E-mail: jshu@cnen.gov.b, E-mail: erochedo@cnen.gov.b [Comissao Nacional de Energia Nuclear (CODIN/CNEN), Rio de Janeiro, RJ (Brazil). Coordenacao de Instalacoes Nucleares; Heilbron, Paulo F.L., E-mail: paulo@cnen.gov.b [Comissao Nacional de Energia Nuclear (COREJ/CNEN), Rio de Janeiro, RJ (Brazil). Coordenacao de Rejeitos; Crispim, Verginia R., E-mail: verginia@con.ufrj.b [Coordenacao dos Programas de Pos-Graduacao de Engenharia (COPPE/UFRJ), Rio de Janeiro, RJ (Brazil). Programa de Engenharia Nuclear

    2011-10-26

    This paper, the city of Rio de Janeiro was taken as a case study. It was processed deterministic and probabilistic simulations vor evaluation of the dose in two exposure sceneries, one of them referring to public members exposure and the other relative to exposure of sewage sanitary treatment plant workers. The results showed that at present the doses for inhabitants of the city and operators of treatment station are lower to dose limit established for the public, the approach presently in use in Brazil is not sufficient to accomplish whit international requirements and the regulation should be revised to be adopted specific values for each radionuclide

  10. Assessment of atmospheric metallic pollution in the metropolitan region of Sao Paulo, Brazil, employing Tillandsia usneoides L. as biomonitor; Avaliacao da poluicao atmosferica por metais na regiao metropolitana de Sao Paulo, Brasil, utilizando a bromelia Tillandsia usneoides L. como biomonitor

    Energy Technology Data Exchange (ETDEWEB)

    Nogueira, Claudio Ailton

    2006-07-01

    Tillandsia usneoides L. is an epiphytic bromeliad that lives on trees or other kinds of inert substrates, absorbing water and nutrients directly from the environment without roots. Due to its morphological and physiological characteristics, this species accumulates the pollutants present in the atmosphere. In the present work, Tillandsia usneoides was used as a bio monitor of metal atmospheric pollution in Sao Paulo, Brazil, which is the biggest city in South America with a population of 18 million inhabitants and a strong industrial activity. The urban area is polluted by industrial emissions but, according to the Environmental Protection Agency of the State of Sao Paulo (CETESB), the governmental agency of air quality control, regularly occurring emissions from about 7.8 million motor vehicles provide the principal source of air pollution. The Tillandsia samples were collected from an unpolluted area and were exposed bimonthly in 10 sites of the city with different pollution levels and in a control site. After exposure, trace metals were analyzed in the plant by instrumental neutron activation analysis and ICP-MS (Pb, Cd, Co, Cu, Ni, Sb e V). The results of the investigation showed a notable concentration of Co and Ni in the plants exposed in an industrial area where there is a metal processing plant, which produces about 600 tons/year of Co and 16,000 tons/year of Ni. Copper and chromium were equally distributed in industrial regions and in sites near heavy traffic avenues, suggesting that these elements can be associated to both vehicular and industrial sources. A high accumulation of Cd in the plant exposed in industrial areas indicates industrial activities as the main source of this element. For Pb, no evident sources could be identified so far as it was spread evenly along the monitoring sites. Traffic-related elements such as Zn, Ba and Sb presented high concentrations in plants exposed in sites near to heavy traffic avenues (cars, buses and trucks) and may be associated to vehicular sources. For Zn, the highest contents were related to industrial zones and this element can be associated to the presence of anthropogenic emission sources. The rare earth elements, Fe and Rb, probably have soil particles as main source. (author)

  11. Evaluation of area monitor response for neutrons in radiation field generated by a 15 MV clinic accelerator; Avaliacao da resposta dos monitores de area para neutrons em campo de radiacao gerado por um acelerador clinico de 15 MV

    Energy Technology Data Exchange (ETDEWEB)

    Salgado, Ana Paula

    2011-07-01

    The clinical importance and usage of linear accelerators in cancer treatment increased significantly in the last years. Coupled with this growth came the concern about the use of accelerators with energies over to 10 MeV which produce therapeutic beam contaminated with neutrons generated when high-energy photons interact with high-atomic-number materials such as tungsten and lead present in the accelerator itself. At these facilities, measurements of the ambient dose equivalent for neutrons present difficulties owing to the existence of a mixed radiation field and possible electromagnetic interference near the accelerator. The Neutron Laboratory of the IRD - Brazilian Institute for Radioprotection and Dosimetry, aiming to evaluate the survey meters performance at these facilities, initiated studies of instrumentation response in the presence of different neutron spectra. Neutrons sources with average energies ranging from 0.55 to 4.2 MeV, four different survey meters and one ionization chamber to obtain the ratio between the dose due to neutrons and gamma radiation were used in this work. The evaluation of these measurements, performed in a 15 MV linear accelerator room is presented. This work presents results that demonstrate the complexity and care needed to make neutrons measurements in radiotherapy treatment rooms containing high energy clinical accelerators. (author)

  12. In vitro evaluation of ionizing radiation effects in bone tissue by FTIR spectroscopy and dynamic mechanical analysis; Avaliacao in vitro dos efeitos da radiacao ionizante em tecido osseo bovino por espectroscoia ATR-FTIR e analise dinamica-mecanica

    Energy Technology Data Exchange (ETDEWEB)

    Veloso, Marcelo Noronha

    2013-07-01

    Ionizing radiation from gamma radiation sources or X-ray generators is frequently used in Medical Science, such as radiodiagnostic exams, radiotherapy, and sterilization of haloenxerts. Ionizing radiation is capable of breaking polypeptidic chains and causing the release of free radicals by radiolysis.of water. It interacts also with organic material at the molecular level, and it may change its mechanical properties. In the specific case of bone tissue, studies report that ionizing radiation induces changes in collagen molecules and reduces the density of intermolecular crosslinks. The aim of this study was to verify the changes promoted by different doses of ionizing radiation in bone tissue using Fourier Transform Infrared Spectroscopy (FTIR) and dynamic mechanical analysis (DMA). Samples of bovine bone were irradiated using Cobalt-60 with five different doses: 0.01 kGy, 0.1 kGy, 1 kGy, 15 kGy and 75 kGy. To study the effects of ionizing irradiation on the chemical structure of the bone, the sub-bands of amide I, the crystallinity index and relation of organic and inorganic materials, were studied. The mechanical changes were evaluated using the elastic modulus and the damping value. To verify whether the chemical changes and the mechanical characteristics of the bone were correlated, the relation between the analysis made with spectroscopic data and the mechanical analysis data was studied. It was possible to evaluate the effects of different doses of ionizing radiation in bone tissue. With ATR-FTIR spectroscopy, it was possible to observe changes in the organic components and in the hydroxyapatite crystals organization. Changes were also observed in the elastic modulus and in the damping value. High correlation with statistical significance was observed among (amide III + collagen)/{sub v1,v3}, PO{sub 4}{sup 3-} and the delta tangent, and among 1/FHWM and the elastic modulus. (author)

  13. Emerging comorbidities in Graves' disease patients treated with radioiodine with more than 10 years of follow-up; Avaliacao do surgimento de comorbidades em pacientes com doenca de Graves tratados com iodo radioativo em acompanhamento por mais de 10 anos

    Energy Technology Data Exchange (ETDEWEB)

    Azevedo, Fernanda Vieira Ramalho de; Blotta, Francisco Gomes da Silva; Goirgetta, Juliana Malheiros; Vaisman, Mario [Universidade Federal do Rio de Janeiro (HUCFF/UFRJ), RJ (Brazil). Hospital Universitario Clementino Fraga Filho. Faculdade de Medicina. Servico de Endocrinologia; Noe, Rosangela [Universidade Federal do Rio de Janeiro (HUCFF/UFRJ), RJ (Brazil). Bioestatistica da Divisao de Pesquisa

    2013-05-01

    Objectives: To evaluate the occurrence of cardiovascular disease and malignant tumors and the mortality rate in patients who received radioiodine treatment for hyperthyroidism due to Graves' disease with at least ten years of follow-up. Materials and methods: The medical records of all patients who were treated with I{sup 131} for Graves' disease at Hospital Universitario Clementino Fraga Filho, Universidade Federal do Rio de Janeiro, were reviewed retrospectively, between January, 1981 and November, 1999. Results: Data from 107 patients (14 men and 93 women), with median age of 54 years were analyzed. Comparing the group of patients who were treated with I{sup 131} therapy with a group of euthyroid patients post-treatment with antithyroid drugs, a significant increase in the occurrence of hypertension and dyslipidemia was observed, but not in mortality rate. Conclusion: To evaluate the real influence of the treatment with radioactive iodine in the occurrence of these comorbidities and the mortality rate, we need a longer follow-up. The age and time of exposure to the effects of hyperthyroidism seem to influence the occurrence of these comorbidities. (author)

  14. 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)

  15. Portable exhauster POR-007/Skid E and POR-008/Skid F storage plan

    International Nuclear Information System (INIS)

    Nelson, O.D.

    1998-01-01

    This document provides storage requirements for 1,000 CFM portable exhausters POR-O07/Skid E and POR-008/Skid F. These requirements are presented in three parts: preparation for storage, storage maintenance and testing, and retrieval from storage. The exhauster component identification numbers listed in this document contain the prefix POR-007 or POR-008 depending on which exhauster is being used

  16. The Role of Non-Destructive Testing in the Los Alamos Reactor Programme; Role des Essais Non Destructifs dans le Programme de Reacteurs de los Alamos; Rol' nedestruktivnykh ispytanij materialov v Los-Alamosskoj reaktornoj programme; Papel de los Metodos de Ensayo No Destructivo en el Programa de Reactores de Los Alamos

    Energy Technology Data Exchange (ETDEWEB)

    Tenney, G. H. [University of California, Los Alamos Scientific Laboratory, Los Alamos, NM (United States)

    1965-10-15

    temperature UHTREX, actuellement en construction, on a etudie par microiadiogiaphie et au moyen de microscopes electroniques des grains de carbure d'uranium enrobes de carbone pyrolytique, d'un diametre de 150 {mu}m, pour evaluer la translocation de l'uranium en fonction de la temperature. On determine la quantite et l'uniformite de la charge d'uranium dans les elements au graphite d'UHTREX au moyen de compteurs a scintillation specialement concus. Environ 90% des travaux effectues a ce sujet n'ont encore fait l'objet d'aucune publication. (author) [Spanish] El Laboratorio Cientifico de Los Alamos, explotado por la Universidad de California por encargo de la Comision de Energia Atomica de los Estados Unidos, viene ocupandose desde hace mas de veinte afios del proyecto, diseno y construccion de reactores nucleares de cuatro tipos generales; a saber, de investigacion, de potencia, de propulsion espacial y para conjuntos criticos. El llamado Grupo de ensayos no destructivos colabora practicamente en todas las actividades y proyectos del laboratorio. En la presente memoria se exponen algunos de los metodos de ensayo no destructivo y sus aplicaciones, establecidos para uso en el programa de reactores. El programa LAPRE (Los Alamos Power Reactor Experiment) se basa en el empleo de una solucion de fosfato de uranio a alta temperatura. La solucion es muy corrosiva y todas las piezas que entren en contacto con ella deben ir revestidas de oro. Durante el proceso de produccion de chapa de oro laminada a partir de lingotes, se han utilizado procedimientos radiograficos especiales para inspeccionar el metal. Las juntas soldadas se examinaron del mismo modo, y ademas se establecio un metodo para comprobar la presencia de impurezas incrustadas en la superficie de la chapa de oro. El concepto fundamental en que se basa el programa LAMPRE (Los Alamos Molten Plutonium Reactor Experiment) es la utilizacion como combustible de plutonio metalico liquido en vez de solido. El combustible esta

  17. Concepciones y concepciones alternativas de estudiantes universitarios/as de biologia y futuros maestros/as de Ciencia de escuela secundaria sobre la teoria de evolucion biologica por seleccion natural

    Science.gov (United States)

    Morales Ramos, Egda M.

    La teoria de evolucion biologica (TEB) por seleccion natural es uno de los conceptos unificadores mas importantes del curriculo de Biologia. En Puerto Rico se han hecho pocas investigaciones que abunden sobre las concepciones y concepciones alternativas (CA) que tienen los estudiantes universitarios/as de Biologia y los maestros/as de Ciencia del nivel secundario sobre esta teoria. La politica publica educativa actual establece mediante documentos normativos como los Estandares de contenido y Expectativas de grado del Programa de Ciencias [Puerto Rico Core Standards] la ensenanza de esta teoria. Sin embargo, no se encontraron preguntas sobre la seleccion natural en los ejercicios de practica provistos por el Departamento de Educacion para las pruebas estandarizadas lo cual puede influir para que no se ensene adecuadamente. Las preguntas de investigacion fueron 1. ¿Cuales son las concepciones y concepciones alternativas de estudiantes universitarios/as y de los futuros maestros y maestras de Ciencia sobre la TEB? 2. ¿Cuales conceptos que seleccionan los estudiantes universitarios/as y los futuros maestros y maestras de Ciencia sobre la TEB coinciden con lo aceptado como valido por la comunidad cientifica? y 3. ¿Como comparan las respuestas de la prueba original. v. Entendiendo el cambio biologico que mide concepciones y CA sobre la TEB por seleccion natural, con las de la traducida al idioma espanol? Se utilizo el metodo cuantitativo con un diseno de investigacion transversal por encuesta. La tecnica principal para recopilar los datos fue una prueba con doce items, que formo parte de un instrumento para el cual se recopilaron diversas fuentes de evidencia acerca de su validez. Las muestras estuvieron formadas por 69 estudiantes de Ciencias Naturales y por 16 estudiantes futuros maestros y maestras del nivel secundario de la UPR-RP. Se utilizaron estadisticas descriptivas, analisis de Ji cuadrado y se calcularon los coeficientes alfa de Cronbach y de Spearman

  18. Verdad por definición

    OpenAIRE

    Garrido Garrido, Julián

    1997-01-01

    Not available.La verdad por definición es un tipo peculiar de verdad científica, distinguible de las verdades lógicas, matemáticas y empíricas. La definición, por su parte, designa diversos procedimientos de asignación de significado, cuyas diferencias exigen una adjetivación cuidadosa: definiciones ostensivas y operacionales, definiciones de diccionario y definiciones teóricas. Pero sólo las del último tipo son verdaderas por definición. En el presente artículo se precisa el concepto formal ...

  19. Síndrome de Munchausen por mandato

    OpenAIRE

    Esteban, Miguel A.; Pérez, Miriam R.; Bracco, Anahí

    2006-01-01

    El Síndrome de Munchausen por mandato, "un trastorno ficticio, por el cual la enfermedad del niño es inducida, promovida o provocada por la persona más próxima a él, generalmente su madre", es todavía mal conocido y su génesis imperfectamente comprendida. Esta comunicación está destinada a esclarecer al pediatra esta patología, con elevada morbilidad y secuelas, como así también de altísima mo...

  20. Determination of forces induced by steam flow in turbines; Determinacion de fuerzas inducidas por flujo de vapor en turbinas

    Energy Technology Data Exchange (ETDEWEB)

    Garcia Castrejon, Juan Carlos

    2008-09-15

    rotor, lo que lleva a fracturas de los componentes por fatiga. Este trabajo estudia y calcula las fuerzas de excitacion de las vibraciones inducidas por flujo. Se realiza el analisis del flujo, en dos etapas diafragma-rotor de una turbina de vapor, con base en el Modelado Computacional de Dinamica de Fluidos (MCDF). Las etapas de la turbina bajo estudio son la primera etapa o paso Curtis y la ultima etapa o etapa de baja presion de la Turbina. El paso Curtis esta formado por alabes pequenos y el flujo esta sometido a altas presiones. El ultimo paso esta compuesto por alabes grandes y el flujo esta sometido a bajas presiones. El MCDF resuelve numericamente las ecuaciones que representan la dinamica de fluidos y se obtiene la variacion del campo de presion en el claro axial rotor-estator causada por la interaccion de las estelas del borde de salida de los diafragmas con el movimiento de los alabes. La variacion del campo de presion induce fuerzas en los alabes ocasionando vibraciones forzadas. En cada una de las etapas se realizaron simulaciones en 2D y 3D, que se resolvieron en funcion del tiempo, usando el modelo de turbulencia RNG - y la tecnica de malla deslizante, para simular el movimiento de los alabes. Los modelos en 3D se resolvieron usando computo en paralelo en un cluster compuesto por 6 procesadores AMD Optaron e 64 bits, 2412.36 MHz y 8Gb de memoria RAM. Los resultados de las simulaciones en las dos etapas, permitieron obtener el comportamiento del campo de presion en el claro axial tobera-rotor y las fuerzas que este campo induce sobre los alabes. La fuerza sobre los alabes fue calculada usando un codigo que se ejecutaba en cada paso temporal de la simulacion, esta fuerza fue posteriormente analizada usando la transformada rapida de Fourier para obtener la fuerza sobre los alabes como una expresion matematica. Usar el MCDF para obtener las fuerzas que actuan sobre los alabes y que son inducidas por flujo representa una ventaja sobre otros metodos de calculo

  1. Avaliação da composição corporal em adolescentes obesos: o uso de dois diferentes métodos Evaluación de la composición corporal en adolescentes obesos: uso de dos metodos diferentes Body composition evaluation in obese adolescents: the use of two different methods

    Directory of Open Access Journals (Sweden)

    Marco Túlio de Mello

    2005-10-01

    Full Text Available A pletismografia é um método rápido e fácil para determinação da composição corporal que utiliza a relação inversa entre pressão e volume. O objetivo do presente estudo foi o de comparar os valores obtidos com o método pletismografia com os valores observados com o DEXA em uma população de adolescentes obesos. Participaram da amostra 88 adolescentes pós-púberes de ambos os sexos, com idades entre 15 e 19 anos (17,01 ± 1,6 ingressantes de um programa de atividade física multidisciplinar. Os voluntários foram submetidos a uma avaliação da composição corporal em dias distintos dentro da mesma semana, pelo método de pletismografia e outra avaliação pelo método DEXA. Quando os métodos foram comparados, não se observaram diferenças significativas entre eles; além disso, foram observadas correlações significativas entre os parâmetros comuns dos dois métodos (massa magra, massa gorda (kg e massa gorda (%, r = 0,88 p La pletismografía es un método rápido y fácil para la determinación de la composición corporal que utiliza la relación inversa entre la presión y el volumen. El objetivo del presente estudio fué el de comparar los valores obtenidos con el metodo pletismografia con los valores observados con el DEXA en una población de adolescentes obesos. Participaron de la muestra 80 adolescentes post púberes de ambos sexos, con edades entre los 15 y los 19 años (17,01±1,6 iniciantes en un programa de actividad física multidisciplinar. Los voluntarios fueron sometidos a una evaluación de la composición corporal en días distintos dentro de la misma semana, por el método de pletismografia y otra evaluación por el método DEXA. Cuando se compararon los métodos, no fueron observadas diferencias significativas entre ellos, además de ello, fueron observadas correlaciones entre los parámetros comunes a los dos métodos (masa magra, masa grasa (kg y masa gorda (%, r = 0,88 p Plethysmography is an easy and

  2. Greenhouse gases emissions inventory in 2005 by the Mexican energy sector; Inventario de emisiones en 2005 de gases de efecto invernadero por el sector energetico mexicano

    Energy Technology Data Exchange (ETDEWEB)

    Flores Velazquez, R.; Munoz Lerdo Carranza, R.; Villalba Valle, D. [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)]. E-mail: rfv@iie.org.mx; rml@iie.org.mx; danviva17@yahoo.com.mx

    2010-01-15

    In the present work, it is estimated the greenhouse gases (GHG, GEI in this paper) emissions in 2005 by the consumption and/or transformation of energy in Mexico. This document is not official, and it is used as reference the fuel consumption reported in the Balance National de Energia 2005 published by the Secretaria de Energia. In this way, it is standardized the emission source that will be used in the near future to estimated the official 2005 GHG Emissions Inventory. In order to solve the absence of own emission factors in Mexico, it is used the default global emission factors proposed by the Intergovernmental Panel for Climate Change. The Sectorial Method was used to estimate the GHG emissions taking in account the fuel consumption in each subsector considered in the energy sector. It was found that the transport and energy industries sector had the most GHG emissions, and that Mexico as a non-industrialized country had lower per capita emissions that developed countries. [Spanish] En este trabajo se calcularon las emisiones de Gases de Efecto de inventario (GEI's) del 2005 por la seccion de consumo y/o transformacion de energia en Mexico. El documento obtenido no es oficial, y como referencia, se utiliza el consumo de combustible que refiere el Balance Nacional de Energia 2005, publicado por la Secretaria de Energia. Con esto, se estandarizan las fuentes de emision que en algun momento usara el Inventario Nacional de Emisiones de GEI's 2005. Para resolver la falta de factores de emision propios de Mexico, se recurre a los factores globales de emision propuestos como valores por omision por el Panel Intergubernamental de Cambio Climatico. Para la estimacion de las emisiones de GEI's se utilizo el Metodo Sectorial tomando en consideracion el consumo de combustible de cada uno de los subsectores en que se encuentra dividido el sector energetico. Se encontro que los sectores transporte y de la industria de la transformacion de energia son los que

  3. La pintura vista por un pintor joven

    Directory of Open Access Journals (Sweden)

    Fuentes Pozo, Pedro

    2000-01-01

    Full Text Available Not available

    El pintor se define a lo largo del tiempo como un artista en mutación influenciado por la sociedad de su momento y por su propio mundo interior Esto ha contribuido a la creación de distintos estilos pictóricos y a una evolución que conlleva la despreocupación por el aspecto formal en aras de una introspección al mundo interior En el cambio constante se refleja la búsqueda del artista que valida la intemporalidad del arte. Así, el verdadero artista sobrevive al aplauso o rechazo de la crítica, convirtiéndose en un verdadero hombre renancentista preocupado por el hallazgo del conocimiento universal.

  4. 14 Nobel, preocupados por el CERN

    CERN Multimedia

    Rivera, A

    2003-01-01

    "E l presidente del Consejo del CERN (Laboratorio Europeo de Fisica de Particulas, junto a Ginebra), Maurice Bourquin, ha recibido una carta firmada por un grupo de cientificos muy especiales: 14 premios Nobel de Fisica" (1 page).

  5. Micetoma por Nocardia brasiliensis: reporte de caso

    Directory of Open Access Journals (Sweden)

    Miriam Guevara R

    2003-07-01

    Full Text Available Se presenta el caso de un paciente peruano, agricultor, con una infección cutánea de origen traumático causada por Nocardia brasiliensis, que evolucionó hacia la amputación del miembro inferior afectado. El diagnóstico se realizó por examen directo y cultivo del espécimen.

  6. Tatuaje por amalgama. Reporte de un caso

    Directory of Open Access Journals (Sweden)

    Luis Fang Mercado

    2012-01-01

    Full Text Available El tatuaje por amalgama se origina por el depósito en el tejido conectivo subepitelial de fragmentos de amalgama resultado de procedimientos iatrogénicos por parte del operador. La profundidad a la que se encuentren albergados los residuos de este material influye en la presentación clínica de las lesiones. Radiográficamente se pueden identificar los fragmentos mientras tengan diámetros razonables; histológicamente se pueden observar las partículas de amalgama como gránulos oscuros, sólidos e irregulares dispuesto entre los haces de colágeno y vasos sanguíneos. Este artículo refiere el caso clínico de un paciente que presentó pigmentación por amalgama en mucosa vestibular, originada por una porción de amalgama usada como material obturador en una apicectomía del 11 realizada con anterioridad. Teniendo en cuenta las consideraciones clínicas y radiográficas se optó por realizar una segunda apicectomía con obturación retrógrada con MTA del 11. Durante el procedimiento quirúrgico se cureteó y adelgazó la cara interna del colgajo mucoperióstico para tratar de disminuir el grado de pigmentación.

  7. The Control of Fast Reactors: Current Methods and Future Prospects; Controle des Reacteurs a Neutrons Rapides. Methodes Actuelles et Perspectives d'Avenir; Upravlenie reaktorami na bystrykh nejtronakh. sushchestvuyushchie metody i dal'nejshie perspektivy; Control de Reactores Rapidos: Metodos Actuales y Perspectivas

    Energy Technology Data Exchange (ETDEWEB)

    Loewenstein, W. B. [Argonne National Laboratory, IL (United States)

    1964-06-15

    examina los actuales mecanismos de control de los reactores de neutrones rapidos. En la medida de lo posible aprovechan el control por medio de fugas neutronicas. Si este metodo no es aplicable se suele recurrir al control por desplazamiento de los materiales del cuerpo. Igualmente se recurre a un control limitado utilizando un absorbente. Ninguno de estos metodos presenta ventajas considerables cuando se aplica a los'grandes reactores de potencia regeneradores, a menos que la razon interna de regeneracion (del cuerpo) sea muy elevada. Se requerira mucha habilidad para utilizar metodos de control basados en el empleo de un absorbente o en el desplazamiento espectral sin afectar en grado apreciable la economia neutronica deseada y a menudo necesaria. El autor cita algunos resultados preliminares obtenidos con sistemas perfeccionados. La reactividad de control viene determinada por los requisitos relativos a la parada del reactor, al ciclo del combustible (exceso de reactividad) y, en menor medida, por la realimentacion dominante. Pueden especificarse perfectamente los requisitos relativos al exceso de reactividad para un ciclo de combustible determinado, pero esos requisitos varian de modo considerable en otros sistemas similares que funcionen con distintos ciclos de combustible. A partir de ciertos limites, pueden fijarse casi arbitrariamente les requisitos relativos al exceso de reactividad. Sin embargo, existen algunas consideraciones generales que rigen la determinacion de este parametro. Se tienen en cuenta dichas consideraciones al examinar la reactividad de control en los actuales reactores de neutrones rapidos comparandola a la cantidad realmente necesaria para el funcionamiento de reactores de potencia regeneradores y neutrones rapidos. El autor cita parametros tipicos de potencia y de realimentacion en funcion de la temperatura a fin de determinar su influencia en los requisitos relativos a la reactividad de control. Los metodos utilizados para predecir la

  8. Temperature and pressure control in the discharge of refrigeration systems cooled by shell and tube condensers; Control de presion y temperatura de descarga en sistemas de refrigeracion enfriados por condensadores de casco y tubo

    Energy Technology Data Exchange (ETDEWEB)

    Fernandez Martinez, R. [Asociacion de Ingenieros Egresados de la Universidad Autonoma Metropolitana, Mexico D. F. (Mexico)

    1995-12-31

    In the selection of a refrigeration equipment, the evaporator and condenser load conditions must be perfectly known, that is, the amount of heat energy that we have to reject from our space to cool in base to the temperature and mass to refrigerate. This situation carries on to the selection of the adequate compressor. But nevertheless the temperature conditions of the environment play an important roll in the behavior of the entire refrigeration system, altering in many cases the working conditions of each one of the components and therefore the functioning of the refrigeration system. This paper presents a method for controlling the behavior of each one of the components of the refrigeration system that perform in accordance with their design characteristics. [Espanol] En la seleccion de un equipo de refrigeracion, se deben conocer perfectamente las condiciones de carga del evaporador y del condensador, es decir la cantidad de calor que debemos de eliminar de nuestro medio a refrigerar, en base a la temperatura y masa a refrigerar. Esta situacion conlleva a la eleccion del compresor adecuado. Mas sin embargo, las condiciones de temperatura ambiente, juegan un papel importante en el comportamiento de todo el sistema de refrigeracion, alterando en muchos casos las condiciones de trabajo de cada uno de los componentes y por ende el funcionamiento del sistema de refrigeracion. El presente trabajo presenta un metodo para controlar el comportamiento de cada uno de los componentes dentro del sistema de refrigeracion para que trabajen de acuerdo a su diseno.

  9. Temperature and pressure control in the discharge of refrigeration systems cooled by shell and tube condensers; Control de presion y temperatura de descarga en sistemas de refrigeracion enfriados por condensadores de casco y tubo

    Energy Technology Data Exchange (ETDEWEB)

    Fernandez Martinez, R [Asociacion de Ingenieros Egresados de la Universidad Autonoma Metropolitana, Mexico D. F. (Mexico)

    1996-12-31

    In the selection of a refrigeration equipment, the evaporator and condenser load conditions must be perfectly known, that is, the amount of heat energy that we have to reject from our space to cool in base to the temperature and mass to refrigerate. This situation carries on to the selection of the adequate compressor. But nevertheless the temperature conditions of the environment play an important roll in the behavior of the entire refrigeration system, altering in many cases the working conditions of each one of the components and therefore the functioning of the refrigeration system. This paper presents a method for controlling the behavior of each one of the components of the refrigeration system that perform in accordance with their design characteristics. [Espanol] En la seleccion de un equipo de refrigeracion, se deben conocer perfectamente las condiciones de carga del evaporador y del condensador, es decir la cantidad de calor que debemos de eliminar de nuestro medio a refrigerar, en base a la temperatura y masa a refrigerar. Esta situacion conlleva a la eleccion del compresor adecuado. Mas sin embargo, las condiciones de temperatura ambiente, juegan un papel importante en el comportamiento de todo el sistema de refrigeracion, alterando en muchos casos las condiciones de trabajo de cada uno de los componentes y por ende el funcionamiento del sistema de refrigeracion. El presente trabajo presenta un metodo para controlar el comportamiento de cada uno de los componentes dentro del sistema de refrigeracion para que trabajen de acuerdo a su diseno.

  10. Evolution of NADPH-cytochrome P450 oxidoreductases (POR) in Apiales - POR 1 is missing

    DEFF Research Database (Denmark)

    Andersen, Trine Bundgaard; Hansen, Niels Bjørn; Laursen, Tomas

    2016-01-01

    The NADPH-dependent cytochrome P450 oxidoreductase (POR) is the obligate electron donor to eukaryotic microsomal cytochromes P450 enzymes. The number of PORs within plant species is limited to one to four isoforms, with the most common being two PORs per plant. These enzymes provide electrons to ...... (available from the SRA at NCBI). All three genes were shown to be functional upon reconstitution into nanodiscs, confirming that none of the isoforms are pseudogenes....

  11. Qualitative analysis by X ray fluorescence of impurities in materials used as air filters; Analisis cualitativo por fluorescencia de rayos X de impurezas en materiales utilizados como filtros de aire

    Energy Technology Data Exchange (ETDEWEB)

    Lartigue G, J; Munoz M, G; Navarrete T, M [Universidad Nacional Autonoma de Mexico, Mexico, D.F. (Mexico)

    1995-06-01

    A qualitative analysis of impurities in 5 materials commonly used as air filters was performed with 2 aims: to compare them, in regard to their impurities and to set a methodology to identify spectroscopically, in a short time (1000 seconds), those impurities in order to subtract the blanks signal from that one generated by the collected sample. Some papers on air filters impurities (cellulose, polycarbonate and glass fiber) were found in literature. In one case, the analysis was performed by energy-dispersive X ray fluorescence, tube generated method. In this work it was employed the same method but a radioisotope (Cd-109) was used as primary source. This was applied to 2 of the above mentioned materials as well as to nylon, teflon and quartz. The glass fiber filter had the highest impurity level: Ca, Ba, Pb, Zn, Sr, Rb, and Fe (0.5 {mu}gFe/cm{sup 2}, measured by Atomic Absorption Spectroscopy). The teflon filter had the lowest impurity level. The developed procedure is fast, precise and reproducible and it may be applied also to wastewaters filters. [Spanish] Se realizo el analisis cualitativo de impurezas en cinco materiales comunmente utilizados como filtros de aire, con dos propositos: compararlos en base a sus impurezas y establecer una metodologia que permitiera, en muy corto tiempo (1000 segundos), identificar espectroscopicamente las impurezas a fin de restar la senal del blanco de aquella que genera eventualmente la muestra. En la bibliografia se encontraron algunas publicaciones acerca de impurezas en filtros de aire (celulosa, pollicarbonato y fibra de vidrio), determinadas principalmente por Absorcion Atomica. En un caso, tal determinacion se realizo por Fluorescencia de Rayos X generados en tubo de descargas y detectados por dispersion de energia. En este trabajo se empleo el mismo metodo de Fluorescencia de Rayos X detectados por dispersion de energia pero generados por un radioisotopo (Cd-109) y se aplico a dos de los tres materiales antes

  12. Acuerdo por la discreción

    Directory of Open Access Journals (Sweden)

    Yeny Serrano

    2006-01-01

    Full Text Available En este artículo se propone un análisis del texto del Acuerdo por la discreción firmado en 1999 por 32 directores de medios de comunicación para “elevar el nivel de calidad y responsabilidad en el cubrimiento y difusión de hechos violentos”. Se analizan los factores que impiden que este Acuerdo produzca cambios efectivos en la práctica profesional informativa y se presenta un modelo (Lemieux, 2000 que tiene en cuenta las variables que influyen en la producción del discurso informativo mediático.

  13. ANTIOXIDANTES: MICRONUTRIENTES EN LUCHA POR LA SALUD

    OpenAIRE

    Zamora S, Juan Diego

    2007-01-01

    Los antioxidantes son sustancias químicas que se caracterizan por impedir o retrasar la oxidación de diversas sustancias principalmente de los ácidos grasos cuyas reacciones se producen tanto en los alimentos como en el organismo humano, en el cual puede provocar alteraciones fisiológicas importantes desencadenantes de diversas enfermedades. Otra de las funciones de los antioxidantes es facilitar el uso fisiológico del oxígeno por parte de las mitocondrias celulares, ayudando a reducir los ef...

  14. Alarma activada por control remoto selectivo.

    OpenAIRE

    Eguíluz Morán, Luis Ignacio; Lara Santillán, Pedro María; Mañana Canteli, Mario

    1995-01-01

    La finalidad de esta invención consiste en disponer de una alarma que bien evite el robo de objetos ligeros y portátiles por el procedimiento que se conoce como "del tirón" --es decir, arrebatar algo y salir corriendo--, bien permita identificar un equipaje entre otros. La originalidad del dispositivo reside en la activación/desactivación del dispositivo de sonido por control remoto, así como la posibilidad de seleccionar el sonido de salida dependiendo de su finalidad. Se reivindica como de ...

  15. PANORAMA LATINOAMERICANO DEL PAGO POR SERVICIOS AMBIENTALES

    Directory of Open Access Journals (Sweden)

    González T. Ángela

    2008-07-01

    Full Text Available Este documento busca proveer al lector de algunos elementos para el análisis y reflexión en torno al pago por servicios ambientales. Para ello, en primera instancia, aborda algunos conceptos básicos relacionados con economía ambiental, seguido de temas como la valoración económica de servicios ambientales y la implementación de mecanismos de pago por algunos de ellos. Lo anterior esta enriquecido con experiencias o estudios de caso a nivel latinoamericano y colombiano.

  16. Reactor Physics Development for Advanced Gas-Cooled Reactors; Recherches en Physique des Reacteurs, pour des Reacteurs Perfectionnes Refroidis par un Gaz; Razrabotka metodov v oblasti reaktornoj fiziki dlya usovershenstvovannogo reaktora s gazovym okhlazhdeniem; Progresos de la Fisica de los Reactores de Tipo Avanzado Refrigerados por Gas

    Energy Technology Data Exchange (ETDEWEB)

    Moore, J. [United Kingdom Atomic Energy Authority (United Kingdom)

    1964-04-15

    para la produccion de energia nucleoelectrica con fines civiles. La principal finalidad de la memoria es describir el considerable trabajo que entrano el desarrollo de metodos teoricos adecuados para calcular: a) la distribucion del flujo y el balance de la reactividad en un cuerpo complejo, b) la distribucion de la potencia en geometrias complejas del combustible, y c) el efecto de la irradiacion sobre los ciclos del combustible y la distribucion de la potencia. A modo de introduccion se menciona la informacion experimental y los metodos teoricos que constituye el resultado de los trabajos con sistemas uranio-magnox, y los datos experimentales comunicados por el British Industries Collaborative Experimental Programma (BICEP), en los que se baso el desarrollo de los metodos teoricos que se han aplicado a los reactores AGR. Con el fin de determinar loe parametros del reticulado del AGR y comprobar los metodos teoricos establecidos para cuerpos de reactor heterogeneos, se ha empleado el conjunto critico APEX y el reactor HERO de energia nula, tanto con reticulados normales como con combinaciones de perturbadores tales como barras de control. Los metodos teoricos desarrollados y empleados hasta ahora se conocen por el nombre de 'hetrecontrol' y 'FTD2'. Se prepararon experimentos para comprobar algunos detalles de las caracteristicas de estos metodos y se han analizado mediciones efectuadas en las instalaciones APEX y HERO con varios cuerpos de 'reactor' de diversos tamanos con el fin de determinar series coherentes de constantes reticulares que concuerden con los resultados experimentales. Seguidamente, a estas constantes puramente empiricas se aplicaron los metodos 'hetrecontrol' y 'FTD2' para planear la puesta en marcha y elegir el esquema de carga del reactor AGR de Windscale. La memoria menciona las tecnicas experimentales comprobadas y las que se han desarrollado para resolver los problemas particulares que se presentaron. Reviste particular interes el examen de los

  17. Experience with a New Colour-Scintillographic Method for Diagnosing Liver Tumours and Inflammatory Liver Disorders; Experience d'une Nouvelle Methode d'Enregistrement Scintigraphique en Couleurs, pour le Diagnostic des Tumeurs Hepatiques et des Affections Inflammatoires du Foie; Opyt ispol'zovaniya novogo metoda tsvetnoj'' stsintigrafii dlya diagnostiki pechenochnykh opukholej i vospalitel'nykh protsessov pecheni; Ensayo de un Nuevo Metodo de Registro Centelleografico Policromo, para el Diagnostico de Tumores Hepaticos y de Inflamaciones del Higado

    Energy Technology Data Exchange (ETDEWEB)

    Sparchez, T.; Gheorghescu, B.; Steclaci, A.; Merculiev, E.; Popovici, M. [Clinique Medicale, Bucarest (Romania)

    1964-10-15

    que le noir represente l'activite maximum, situee au centre du foie ou le parenchyme est plus epais. Les couleurs intermediaires correspondent aux differentes zones d'isoradioactivite. Les auteurs ont etudie, a l'aide de cette methode, 150 cas de tumeurs hepatiques malignes (primitives et secondaires) et de tumeurs benignes, 80 cas d'hepatite chronique et de cirrhose et 50 cas normaux. Dans la majorite descas, ils ont utilise l'or-198 colloiedal (Amersham-Angleterre) injecte par voie intraveineuse. Ils ont effectue parallelement, dans un grand nombre de cas, des mecanogrammes, photoscintigrammes en blanc et noir et scintigrammes en couleurs. Le diagnostic a ete verifie par ponction, laparoscopie, laparophoto ou cinematographie, ponction biopsique, intervention chirurgicale ou necropsie. La methode scintigraphique en couleurs permet de mieux distinguer les variations d'intensite de la radioactivite, c'est-a-dire la desorganisation ou la substitution du parenchyme hepatique par processus tumoraux. (author) [Spanish] Para obtener imagenes que reflejasen mejor los detalles de la estructura del parenquima hepatico modificado por la enfermedad, los autores adaptaron al aparato Scanner-Tracerlab un dispositivo gracias al cual se pueden obtener diagramas hepaticos en siete colores. Cada color, elegido arbitrariamente, corresponde a un numero dado de impulsos y representa zonas de isorradiactividad, es decir, de tejido hepatico de volumen relativamente igual. En el centelleograma policromo, el blanco representa la radiactividad de fondo, mientras que el negro representa la actividad maxima, situada en el centro del higado, donde el parenquima es mas espeso. Los colores intermedios corresponden a las diferentes zonas de isorradiactividad. Recurriendo a este metodo, los autores estudiaron 150 casos de tumores hepaticos malignos (primitivos y secundarios) y de tumores benignos, 80 casos de hepatitis cronica y de cirrosis, y 50 casos normales. En la mayoria de los casos utilizaron

  18. Elements of a thermic method of preparing beta-sources with fused carriers, including strontium-90; Elements d'une methode thermique de preparation de sources beta avec des entraineurs fondus, y compris le strontium-90; Osnovy termicheskogo metoda prigotovleniya beta-istochnikov s plavlennymi nositelyami, vklyuchayushchimi strontsij-90; Bases de un metodo termico de preparacion de fuentes beta con portadores fundidos, incluido el estroncio-90

    Energy Technology Data Exchange (ETDEWEB)

    Bogdanov, N I; Zakharova, K P; Zimakov, P V; Kulichenko, V V

    1962-01-15

    comprises entre 100 et 1000{sup o}C, et expliquent le choix des parametres de base du procede employe. Ils precisent les fondements de la methode qui consiste a monter une preparation vitreuse contenant la quantite necessaire de {sup 90}Sr, sur des supports de forme et dimensions diverses en acier, ceramique et autres matieres. Enfin, les auteurs examinent les parametres de base qui permettent l'exploitation sure et sans danger des differents types de sources, et ils donnent des renseignements sur les sources de {sup 90}Sr preparees par la methode thermique. (author) [Spanish] Las fuentes de radiaciones ionizantes basadas en el radioisotopo {sup 90}Sr se utilizan ampliamente en la industria para los dispositivos y sistemas de control y regulacion automaticos. La preparacion de las fuentes consiste en la deshidratacion de una mezcla formada por una solucion radiactiva de nitrato de estroncio, y compuestos tales como el anhidrido borico, silice, alumina, etc. Por calentamiento de la mezcla deshidratada a temperaturas elevadas, se obtiene una masa fundida muy fluida que, una vez fria, da una masa vitrea que contiene la cantidad requerida de {sup 90}Sr. Los autores presentan datos y examinan los resultados obtenidos al estudiar la deshidratacion del sistema SrO - B{sub 2}O{sub 3}- SiO{sub 2} a temperaturas comprendidas entre 100 y 1000{sup o} C; tambien explican su eleccion de los parametros basicos del proceso tecnologico. Exponen en lineas generales un metodo que consiste en montar sobre acero, materiales ceramicos u otras sustancias, de distintas formas y dimensiones, una masa vitrea que contenga la cantidad requerida de {sup 90}Sr. La memoria estudia los parametros fundamentales para lograr una explotacion regular y segura de los distintos tipos de fuente, y presenta datos relativos y fuentes de {sup 90}Sr preparadas por el metodo termico. (author) [Russian] Istochniki ioniziruyushchikh izluchenij na osnove radioizotopa Sr''9''0 shiroko primenyayutsya v priborakh i skhemakh

  19. Pedro Teixeira y su viaje por Mesopotamia

    Directory of Open Access Journals (Sweden)

    Fuente del Pilar, José Javier

    2005-04-01

    Full Text Available Pedro Teixeira es un integrante notable de la ilustre nómina de los viajeros portugueses que, a finales del s, XVI y principios del XVII, ensancharon para Occidente las fronteras del mundo. Su conocimiento en España se debe a la publicación en 1994 de su obra «Relaciones del Origen, Descendencia y Sucesión de los Reyes de Persia, y de Harmuz, y de un viaje hecho por el autor dende la India hasta Italia por tierra», en edición realizada por el profesor Eduardo Barajas Sala, lamentablemente fallecido en 1997. En este artículo se ofrece una reseña biográfica de Pedro Teixeira, y un análisis del viaje narrado por el autor en la última parte de sus «Relaciones »: el que desde Ormuz le conducirá, a través de Mesopotamia, hasta la costa del Mediterráneo.…

  20. UNA APROXIMACION A LOS DETERMINANTES SOCIOECONOMICOS DE LA MORTALIDAD INFANTIL Y DE NIÑEZ EN BOLIVIA: USO DE METODOS INDIRECTOS DE CALCULO DE MORTALIDAD Y ANALISIS BIVARIADO

    Directory of Open Access Journals (Sweden)

    Pamela Córdova

    2016-01-01

    Full Text Available A pesar de las importantes mejoras en los resultados de salud infantil y de niñez durante el Siglo XXI en América Latina, las tasas de mortalidad infantil y de niñez permanecen inaceptablemente altas en Bolivia encontrándose entre las más elevadas la región, solo por debajo de Haití, dirigiéndose a una deficiente salud infantil y de niñez. Estos resultados requieren de evidencia científica sobre la mejor manera de hacer frente a sus determinantes. Este estudio aproxima, teóricamente, mediante el marco teórico propuesto por Mosley-Chen y Sastry, los determinantes de la mortalidad infantil y de niñez en Bolivia enfocados en características individuales, del hogar y contextual. Además se examina de manera preliminar los niveles y magnitudes de la mortalidad mediante el uso de métodos directos e indirectos de estimación mediante la técnica propuesta por la versión Trussel y la versión Palloni-Heligman del Método de Brass y se realiza un análisis bivariado que da cuenta de relaciones existentes entre la mortalidad infantil y de niñez y las variables a nivel del hogar, individual y contextual relacionado con las políticas públicas.

  1. Determination of {sup 60} Co by means of Neutron Activation Analysis in the sorption of Co in synthesized porous oxides by the combustion method; Determinacion de {sup 60} Co por medio de AAN en la sorcion de Co en oxidos porosos sintetizados por metodo de combustion

    Energy Technology Data Exchange (ETDEWEB)

    Lugo, V.; Bulbulian, S.; Urena, F. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)]. e-mail: violelugo@yahoo.es

    2005-07-01

    Recently inorganic materials are investigating as sorbent of radioactive pollutants present in water. The inorganic oxides belong to this group of materials. A quick method exists for the obtaining of inorganic oxides, denominated combustion method that could be used to produce porous oxides successfully with good properties for the sorption of radioactive ions. In this investigation, iron oxides, magnesium and zinc were synthesized obtained by the combustion method, comparing them with those synthesized by the calcination method, using two different synthesis temperatures. The obtained solids were characterized by scanning electron microscopy (Sem), by X-ray diffraction (XRD) and by semiquantitative elemental analysis (EDS). After the characterization, the crystalline oxides synthesized by both methods, to temperature of 800 C, were evaluated as sorbents in the removal of Co{sup 2+} ions, through experiments in batch, and using neutron activation analysis, determining the sorption percentage, with this it was concluded that the magnesium oxide produced by combustion it is more effective in the removal of Co{sup 2+} ions than that synthesized by calcination. It was determined the surface area of the magnesium oxides, obtaining a surface area greater for the synthesized oxide by combustion method. (Author)

  2. Labeling of vasoactive intestinal peptide (VIP) and VIP 10-28 fragment with radioiodine by direct method. Comparative study of the kinetics biodistribution and affinity for neuroendocrine tumor cells; Marcacao do peptideo intestinal vasoativo (VIP) e do fragmento VIP10-28 com radioiodo por metodo direto. Estudo comparativo da cinetica de biodistribuicao e da afinidade por celulas de tumor neuroendocrino

    Energy Technology Data Exchange (ETDEWEB)

    Colturato, Maria Tereza

    2005-07-01

    In the progress of the Nuclear Medicine, many protein based radiopharmaceuticals have been developed in the last years using antibodies and, more recently, biologically active natural peptides or similar synthetic peptides. In the search for agents with specificity for the target tissue in tumors detection, it was verified that small sequences of amino acids may interact with selective sites, with homogenous distribution, fast accumulation in tissues and fast blood clearance when compared to the antibodies. Among the peptides used in the diagnosis of tumors, Vasoactive Intestinal Peptide (VIP) has been studied. VIP labeled with iodine-123 is applied in the images of intestinal adenocarcinoma and endocrine tumors. The molecule of VIP contains two tyrosine residues, in the positions 10 and 22 that are, theoretically, equally susceptible to radioiodination for direct method. The objective of this work was to produce VIP labeled with radioiodine (iodine-123), in order to introduce to the brazilian medical class this radiopharmaceutical of interest for the diagnosis and recurrence of tumors that express specific receptors. In an unpublished way, the work studied the labeling and the kinetic distribution of the VIP fragment (VIP 10-28) and verified its potential as radiopharmaceutical applied in the identification of tumors that express VIP receptors. After the choice of the appropriated technique for labeling VIP and VIP 10-28 with radioiodine, using Ceremonial T as oxidant agent and sodium metabisulfite as reducing agent, the quality control procedures were accomplished (electrophoresis and high performance liquid chromatography, HPLC) for radiochemical purity determination as well as the separation of the radiochemical species obtained. Labeling and quality control procedures applied were efficient and accurate. [{sup 131}I]VIP and [{sup 131}l]VIP 10-28 were obtained with high radiochemical purity (> 95%). The purification studies to remove free radioiodine in the labeling mixture (simple purification) and to produce the radiopharmaceutical with high specific activity (complex purification and HPLC), were both efficient in the separation of the species in the reaction mixtures, as demonstrated by quality control procedures. Biological distribution studies were accomplished by venous administration of the radiopharmaceuticals in laboratory animals: biodistribution study of [{sup 131}I]VIP and [{sup 131}I]VIP 10-28 in normal Swiss mice, [{sup 131}I]VIP not purified and purified in Swiss mice with tumor and [{sup 131}I]VIP and [{sup 131}I]VIP 10-28 in Nude mice with tumor, scintigraphic images of [{sup 131/123}I]VIP and [{sup 123}I]VIP 10-28 in Swiss and Nude mice and Wistar rats with tumor. In vitro studies were accomplished to determine the percentage of [{sup 131}I]VIP and [{sup 131}I]VIP 10-28 bound to plasmatic proteins, stability study of [{sup 131}I]VIP and [{sup 131}I]VIP 10-28 in human plasma and the affinity and internalization of [{sup 131}I]VIP and [{sup 131}I]VIP 10-28 by tumour adenocarcinoma cells of human rectal colon (HT-29). All biological distribution studies demonstrated that both [{sup 131/123}I]VIP and [{sup 131/123}I]VIP 10-28 showed fast blood clearance, low renal and liver uptake, relative uptake in thyroid, showing in vivo dehalogenation and good uptake in tumour. Comparative biological distribution of the radiopharmaceuticals showed high uptake in the stomach for both peptides. The blood clearance of the fragment was slower, and influences the visualization of the tumour mass. The radiopharmaceuticals, [{sup 123}I]VIP and [{sup 123}I]VIP 10-28, were obtained with high radiochemical purity, but with low radiochemical yield when comparing with labeling procedures using iodine-131. Quality control assays of [{sup 123}I]Na indicated that the presence of radiochemical and radionuclide impurities influenced on labeling results. (author)

  3. Effect of the crystallinity in the Tl signal induced by the gamma radiation in Al{sub 2}O{sub 3}: Eu obtained by the sol gel method; Efecto de la cristalinidad en la senal Tl inducida por la radiacion gamma en Al{sub 2}O{sub 3}: Eu obtenida por el metodo sol gel

    Energy Technology Data Exchange (ETDEWEB)

    Mendoza A, D.; Gonzalez M, P.R. [ININ, Gerencia de Ciencias de Materiales. Carr. Mexico-Toluca Km. 36.5, 52045 Ocoyoacac (Mexico); Custodio, E. [Universidad Juarez Autonoma de Tabasco, DACB, Carr. Cunduacan-Jalpa, km. 1.5, 86680 Tabasco (Mexico); Rubio, E.; Rodriguez L, V. [Facultad de Ingenieria Quimica, BUAP. Av. San Claudio y 18 Sur Col. San Manuel. C. P. 72570.C.U. Puebla (Mexico)

    2004-07-01

    In this work the synthesis and characterization process of Al{sub 2}O{sub 3} and Al{sub 2}O{sub 3}: Eu by sol gel method is reported. A previous thermal treatment at 500 and 1000 C on the material powder type showed a notable influences on the thermoluminescent signal induced by the gamma radiation, such that the intensity thermoluminescent signal produced by samples with thermal treatment at 1000 C is much bigger that thermoluminescent signal produced by samples thermal treatment at 500 C. In order to explain this behavior, an analysis for X-ray diffraction and electron microscopy was also realized. The results show a notably influence of the crystalline array and the microstructure on the thermoluminescent behavior of the alumina. (Author)

  4. Correlation of the glomerular filtration rate by the Gates scintigraphy method and by the creatinine purification in urine of 24 hours; Correlacion de la tasa de filtracion glomerular por el metodo gamagrafico de Gates y por la depuracion de creatinina en orina de 24 horas

    Energy Technology Data Exchange (ETDEWEB)

    Gomez A, E

    2003-07-01

    The kidney is an important organ that makes that exist equilibrium inside the organism. In it' s multiple functions, one that interests us to know is the glomerular filtration rate (GFR). To know this, exist laboratory and scintigraphy studies like the scintigraphy with technique of Gates and the creatinine purification in urine of 24 hours. The files of 44 patients were studied, which were clinically candidates to kidney donors healthy (25 women and 19 men) with ages that varied from the 18 years to the 54 years ( 35.1 years), with a weight of 43 kilograms to 94 kilograms (68.95 Kg) and with a corporal surface of 1.29 to 2.08 m{sup 2} (1.70 m{sup 2}). These patients underwent study protocols with creatinine purification and with renal scintigraphy. The glomerular filtration rate obtained by creatinine purification varied from 51.9 ml/min. to 156 ml/min. and the GFR obtained by scintigraphy varied from 3.6 ml/min. to 155.2 ml/min. Once obtained the gathering of data the test of Student was applied to compare the averages of both distributions and the analysis of lineal regression to determine the coefficients of correlation of the complete group. (Author)

  5. Oxygen reduction using platinum electrocatalysts prepared by liquid phase photo-deposition; Reduccion de oxigeno mediante electrocatalizadores de platino preparados por foto-deposicion en fase liquida

    Energy Technology Data Exchange (ETDEWEB)

    Ruiz-Camacho, B.; Perez-Galindo, J. A.; Valenzuela, M. A.; Gonzalez-Huerta, R. G. [Instituto Politecnico Nacional, ESIQIE, Mexico D.F. (Mexico)]. E-mail: rosgonzalez_h@yahoo.com.mx

    2009-09-15

    difraccion de rayos-X, quimisorcion de hidrogeno y microscopia electronica de transmision. El estudio electroquimico se realizo con las tecnicas de voltamperometria ciclica y electrodo de disco rotatorio. Se utilizo Pt E-tek como catalizador de referencia. Con los resultados de difraccion de rayos-X se identificaron los picos del platino correspondientes a las fases cristalinas (111) y (200), cuya intensidad fue mayor cuando se utilizo el H{sub 2}PtCl{sub 6} respecto al Pt(acac){sub 2}. De las pruebas de quimisorcion de hidrogeno y microscopia electronica de transmision, se encontro que el menor tamano de particula (1-5 nm) y la mayor dispersion metalica se obtuvo al utilizar Pt(acac){sub 2} como precursor de platino y foto-deposicion en fase liquida, asi mismo se encontro que este material presento la mejor respuesta electroquimica, mostrando un potencial a circuito abierto de 0.96 V y un sobre-potencial de 0.05 V respecto al H{sub 2}PtCl{sub 6} y de 0.22 V respecto al catalizador obtenido por el metodo de impregnacion.

  6. Conservación por calor

    OpenAIRE

    Cobos García, Angel; Díaz Rubio, Olga

    2011-01-01

    Esta unidade didáctica denominada Conservación por calor forma parte da materia «Tecnoloxía do procesado de alimentos» que se impartirá no primeiro semestre do 2º curso do Grao en Nutrición Humana e Dietética. A materia estrutúrase en diferentes unidades didácticas, tratando cada unha delas as diferentes tecnoloxías de procesado dos alimentos, tanto de conservación coma de transformación. A presente unidade didáctica aborda a conservación dos alimentos por calor. Este método permite destruír ...

  7. Celulitis por cuerpo extraño

    Directory of Open Access Journals (Sweden)

    Miguel B. Carrasco Guzmán

    2016-01-01

    Full Text Available Las infecciones de la piel y el tejido celular subcutáneo surgen como un grupo importante de afecciones con una alta morbilidad en edades pediátricas, generalmente relacionada con traumatismo y cuerpos extraños. Se presenta el caso de una escolar femenina de 6 años de edad, con síntomas y signos clínicos que sugieren celulitis en el muslo derecho,  por su evolución tórpida se le realizó el estudio ultrasonográfico que confirmó el diagnóstico etiológico de una celulitis secundaria a un traumatismo, provocada por la introducción de un gran cuerpo extraño, que pasó inadvertido para a familia de la menor.

  8. MIASIS CUTÁNEA POR CORDYLOBIA ANTHROPOPHAGA

    Directory of Open Access Journals (Sweden)

    Miriam Alkorta Gurrutxaga

    2001-01-01

    Full Text Available El incremento progresivo en el número de personas que viajan a países tropicales ha hecho que las enfermedades importadas adquieran una relevancia cada vez mayor. Las miasis (o infestaciones por larvas de moscas cutáneas se encuentran entre este tipo de enfermedades siendo especialmente frecuentes en países tropicales. A propósito de la observación de un caso de miasis cutánea masiva por Cordylobia antropophaga, que ocurrió en una mujer de 34 años de edad al volver de un viaje a Senegal, se ha efectuado una revisión de los casos de miasis cutáneas forunculoides importadas publicados en España, así como de la biología, patología, tratamiento y prevención de la miasis humana por Cordylobia anthropophaga. El caso referido, se caracterizó por la infestación con un número inusualmente elevado de larvas, no sospechándose su etiología hasta la fase final de la enfermedad. La emergencia continuada de larvas (se recogieron 91 generó en la paciente un estado de ansiedad importante. Finalmente, la eliminación de las larvas provocó una rápida mejoría de la paciente. Aunque los casos de miasis cutánea no tienen la gravedad de otras enfermedades importadas, su conocimiento es necesario desde el punto de vista preventivo, diagnóstico y terapeútico. Es importante proceder a la identificación morfológica de las larvas diferenciándolas de otro tipo de miasis con implicaciones terapéuticas diferentes.

  9. Compostos antimicrobianos produzidos por Streptomyces Spp.

    OpenAIRE

    Silva, Ingrid Reis da

    2012-01-01

    O aumento crescente de bact?rias resistentes a antibi?ticos incentiva ? pesquisa por novas subst?ncias antibacterianas. Diante disso, a sele??o de microrganismos com potencial para a produ??o de novos compostos antimicrobianos tem sido amplamente estudada. Dentre estes microrganismos uma especial aten??o ? dada aos actinomicetos que apresentam capacidade de produzir uma variedade de compostos bioativos como antibi?ticos, antif?ngicos, antitumorais entre outros compostos que pod...

  10. Amar por cartas - este inferno de amara

    Directory of Open Access Journals (Sweden)

    Matildes Demetrio dos Santos

    1999-10-01

    Full Text Available Este trabalho tem por objetivo estudar o amor nas Folhas caídas e nas Cartas de amor à Viscondessa da Luz, de Almeida Garrett.Seus poemas cheios de erotismo e sensua lidade, inspirados numa mulher casada, Rosa Montúrar Infante, escandalizaram a sociedade portuguesado sécu lo XIX. Suas cartas de amor, em segredo, criavam uma ficção de características místicas.

  11. Por un humor ético

    Directory of Open Access Journals (Sweden)

    Victor Paramo Valero

    2016-04-01

    Full Text Available Ética del humor es una obra original, abundantemente documentada, de contenido científico y filosófico, que aborda un problema de gran importancia en los actuales estudios de éticas aplicadas. La ética del humor es una nueva ética aplicada que pretende comprender el fenómeno del humor a la luz de sus implicaciones éticas. Como señala el autor, Juan Carlos Siurana, reputado experto en el ámbito de la filosofía práctica, el interés por el humor es un interés por la ética. En la obra no presenta una nueva teoría filosófica del humor –las cuales se han venido sucediendo, al menos, desde los Diálogos de Platón–, sino una nueva teoría ética, que toma al humor como objeto principal de análisis. Por tanto, la finalidad es realizar una aportación dentro del ámbito de la ética. Para ello se nutre de distintos estudios psicológicos, biológicos, fisiológicos y neurológicos sobre el humor, así como de clásicas obras de filosofía que han abordado esta cuestión.

  12. El aprendizaje visto por los estudiantes venezolanos

    Directory of Open Access Journals (Sweden)

    Berta Elena Barrios

    2015-01-01

    Full Text Available En el siguiente trabajo se presentan los resultados de un estudio sobre las con-cepciones del aprendizaje de un grupo de estudiantes venezolanos de educa-ción primaria y media. Se trató de replicar el instrumento y procedimiento deanálisis utilizado por los investigadores Berry y Sahlberg (1996, con el objetivode caracterizar cómo conciben el aprendizaje estudiantes venezolanos entre 11y 15 años de edad y compararlo con sus pares ingleses y finlandeses. El análi-sis de resultados se basó en los criterios propuestos por dichos autores, deno-minados Pasos para un Buen Aprendizaje. Los hallazgos indican que los estu-diantes venezolanos conciben el aprendizaje como memorizar conocimientos,básicamente escolares, enseñados por los docentes. Las concepciones deambas poblaciones se ubican en una visión pasiva del aprendizaje. Se discutela vinculación de las concepciones del aprendizaje con las prácticas de la escuela.

  13. Eritema multiforme mayor desencadenado por antimicrobianos

    Directory of Open Access Journals (Sweden)

    Ronaldo de Carvalho Raimundo

    2010-03-01

    Full Text Available El eritema multiforme, aparece como una enfermedad sistémica con la participación de la piel y las membranas mucosas en relación con varios factores como las infecciones bacterianas o virales, y en particular la administración de drogas, analgésicos y antibióticos en general. Se presenta un paciente masculino de 29 años de edad con eritema multiforme mayor desencadenado por antimicrobianos con la aparición de lesiones vesiculares-bulloso-ulcerosas en las regiones de los labios, encías, la lengua y la mucosa genital en tratamiento de una infección del tracto urinario con norfloxacino 400 mg por una semana. Fue realizado un tratamiento de soporte con el uso de colutorios para la higienización bucal y pomada a base de corticoide para protección de las úlceras, antihistamínicos y orientación nutricional de dieta líquida hipercalórica e hiperproteica. Este síndrome está caracterizado como un proceso eruptivo buloso agudo que compromete la calidad de vida del paciente y no hay pruebas de laboratorio específicas por lo que su diagnóstico debe estar basado en la revisión minuciosa de la anamnesis y en los hallazgos clínicos.

  14. Methods for the control of NOx and particles in the combustion; Metodos para el control de NOx y particulas en la combustion

    Energy Technology Data Exchange (ETDEWEB)

    Romo Millares, Cesar A. [Instituto de Investigaciones Electrica, Cuernavaca (Mexico)

    1996-12-31

    This present the techniques and equipment of control of transmissions for thermoelectric power stations appear that have mayor possibilities of being considered in the future immediate within the national energetic panorama and the frame established by the environmental normative. The subject polluting compounds to overhaul are oxides of nonburned nitrogen and particles [Espanol] Se presentan las tecnicas y equipos de control de emisiones para centrales termoelectricas que tienen mayores posibilidades de ser consideradas en el futuro inmediato dentro del panorama energetico nacional y el marco establecido por la normatividad ambiental. Los compuestos contaminantes sujetos a revision son los oxidos de nitrogeno y las particulas inquemadas

  15. Methods for the control of NOx and particles in the combustion; Metodos para el control de NOx y particulas en la combustion

    Energy Technology Data Exchange (ETDEWEB)

    Romo Millares, Cesar A [Instituto de Investigaciones Electrica, Cuernavaca (Mexico)

    1997-12-31

    This present the techniques and equipment of control of transmissions for thermoelectric power stations appear that have mayor possibilities of being considered in the future immediate within the national energetic panorama and the frame established by the environmental normative. The subject polluting compounds to overhaul are oxides of nonburned nitrogen and particles [Espanol] Se presentan las tecnicas y equipos de control de emisiones para centrales termoelectricas que tienen mayores posibilidades de ser consideradas en el futuro inmediato dentro del panorama energetico nacional y el marco establecido por la normatividad ambiental. Los compuestos contaminantes sujetos a revision son los oxidos de nitrogeno y las particulas inquemadas

  16. Seguridad del paciente en Radioterapia Intraoperatoria: Impacto de los elementos controlados por el Radiofisico

    Science.gov (United States)

    Tarjuelo, Juan Lopez

    Introduccion: En la administracion de la radioterapia intervienen profesionales y equipos de tratamiento, por lo que existe el riesgo de error y se precisa que dicho equipamiento funcione conforme a lo esperado. A los radiofisicos les corresponde participar en las actividades de garantia o aseguramiento de la calidad, incluyendo el control de calidad de los equipos, y en la evaluacion de los riesgos asociados. La radioterapia intraoperatoria (RIO) es una tecnica radioterapica de intensificacion de dosis, altamente selectiva, dirigida a volumenes anatomicos restringidos durante el tratamiento quirurgico oncologico, basada en la administracion de una dosis absorbida alta por medio de un haz de electrones tras el examen visual directo del lecho tumoral. Como incorporar los ultimos avances en el refuerzo de la seguridad en radioterapia es una tarea ambiciosa y compleja, resulta mas concreta y de inmediata aplicacion su introduccion en la RIO. El objetivo es analizar los elementos que reducen los riesgos y aumentan la seguridad en la RIO y su dosimetria, y valorar la funcion del radiofisico en esta labor. Material y metodos: Se emplearon el planificador Radiance de GMV y el acelerador lineal de los tratamientos de RIO Elekta Precise, controlado con el verificador diario de haces Daily QA Check 1090 y medido con las camaras de ionizacion PPC 40, FC65-G y FC65-P de PTW-Freiburg, a su vez verificadas con fuentes radiactivas adecuadas de estroncio-90 modelos CDP y CDC de IBA Dosimetry. Se realizo un analisis de modos de fallo y efectos (failure mode and effect analysis, FMEA) con el fin de identificar los elementos que forman la RIO y aplicar las herramientas necesarias para la minimizacion de los riesgos y la mejora de la seguridad en la tecnica. Se estudiaron las verificaciones diarias de dicho acelerador Precise con el control estadistico de procesos (statistical process control, SPC) y se simularon intervenciones para devolverlo al estado llamado en control. El SPC

  17. Structural Insights into the PorK and PorN Components of the Porphyromonas gingivalis Type IX Secretion System.

    Science.gov (United States)

    Gorasia, Dhana G; Veith, Paul D; Hanssen, Eric G; Glew, Michelle D; Sato, Keiko; Yukitake, Hideharu; Nakayama, Koji; Reynolds, Eric C

    2016-08-01

    The type IX secretion system (T9SS) has been recently discovered and is specific to Bacteroidetes species. Porphyromonas gingivalis, a keystone pathogen for periodontitis, utilizes the T9SS to transport many proteins including the gingipain virulence factors across the outer membrane and attach them to the cell surface via a sortase-like mechanism. At least 11 proteins have been identified as components of the T9SS including PorK, PorL, PorM, PorN and PorP, however the precise roles of most of these proteins have not been elucidated and the structural organization of these components is unknown. In this study, we purified PorK and PorN complexes from P. gingivalis and using electron microscopy we have shown that PorN and the PorK lipoprotein interact to form a 50 nm diameter ring-shaped structure containing approximately 32-36 subunits of each protein. The formation of these rings was dependent on both PorK and PorN, but was independent of PorL, PorM and PorP. PorL and PorM were found to form a separate stable complex. PorK and PorN were protected from proteinase K cleavage when present in undisrupted cells, but were rapidly degraded when the cells were lysed, which together with bioinformatic analyses suggests that these proteins are exposed in the periplasm and anchored to the outer membrane via the PorK lipid. Chemical cross-linking and mass spectrometry analyses confirmed the interaction between PorK and PorN and further revealed that they interact with the PG0189 outer membrane protein. Furthermore, we established that PorN was required for the stable expression of PorK, PorL and PorM. Collectively, these results suggest that the ring-shaped PorK/N complex may form part of the secretion channel of the T9SS. This is the first report showing the structural organization of any T9SS component.

  18. Structural Insights into the PorK and PorN Components of the Porphyromonas gingivalis Type IX Secretion System.

    Directory of Open Access Journals (Sweden)

    Dhana G Gorasia

    2016-08-01

    Full Text Available The type IX secretion system (T9SS has been recently discovered and is specific to Bacteroidetes species. Porphyromonas gingivalis, a keystone pathogen for periodontitis, utilizes the T9SS to transport many proteins including the gingipain virulence factors across the outer membrane and attach them to the cell surface via a sortase-like mechanism. At least 11 proteins have been identified as components of the T9SS including PorK, PorL, PorM, PorN and PorP, however the precise roles of most of these proteins have not been elucidated and the structural organization of these components is unknown. In this study, we purified PorK and PorN complexes from P. gingivalis and using electron microscopy we have shown that PorN and the PorK lipoprotein interact to form a 50 nm diameter ring-shaped structure containing approximately 32-36 subunits of each protein. The formation of these rings was dependent on both PorK and PorN, but was independent of PorL, PorM and PorP. PorL and PorM were found to form a separate stable complex. PorK and PorN were protected from proteinase K cleavage when present in undisrupted cells, but were rapidly degraded when the cells were lysed, which together with bioinformatic analyses suggests that these proteins are exposed in the periplasm and anchored to the outer membrane via the PorK lipid. Chemical cross-linking and mass spectrometry analyses confirmed the interaction between PorK and PorN and further revealed that they interact with the PG0189 outer membrane protein. Furthermore, we established that PorN was required for the stable expression of PorK, PorL and PorM. Collectively, these results suggest that the ring-shaped PorK/N complex may form part of the secretion channel of the T9SS. This is the first report showing the structural organization of any T9SS component.

  19. Utilizacion del metodo de hidrolisis de los amilostatolitos para el diagnostico de resistencia al calor, la sequia y la salinidad en el tomate

    Directory of Open Access Journals (Sweden)

    Jorge A. Sánchez

    2000-01-01

    Full Text Available Se propone 5 indices de calidad que penni- ten estimar certerarnentel nivel de calidad y po- tencial productivo de una plantaci6n forestal. £1 primer indice es el de calidad general y debe uti- lizarse preferiblemente en plantaciones no ralea- das. £ste indiceproducira valores de 1.0-4.0. Valo- res cercanos a 1 serlin de plantaciones de la mas al- ta calidad. £1 segundo es el de calidad de cosecha y se basa en la cantidad de individuos presentes por ha de calidad 1 y 2. Una plantaci6n con 400 indi- viduos de calidad 1 +2 seria excelente y con menos de 200 individuos seria de mala calidad. £1 tercero es el de calidad maxima, que busca reflejar en que proporci6n la plantaci6n se aproxima al maximo numero posible de individuos de calidad 1 y de 40 cm de dap que puede contener una plantaci6n fo- festal ala cosecha; es basado en N 1=250 Y genera harvalores porcentuales, donde una plantaci6n con >90% seria excelente y 1600 trozas/ha de calidad 1+2 son excelentes y aquellas <800 trozas son inaceptables. Por ultimo se incluye el indice de calidad de productividad, que permite valorar la calidad de una plantaci6n en

  20. Vasculitis inducida por metimazol: Reporte de caso

    Directory of Open Access Journals (Sweden)

    Miguel Pinto

    2011-07-01

    Full Text Available Se reporta el caso de una paciente con enfermedad de Graves, que presentó vasculitis asociada al uso de metimazol. Mujer de 14 años, que acudió a consulta por presentar intolerancia al calor, tremor distal y palpitaciones. El examen físico mostró bocio difuso, y el perfil tiroideo, TSH suprimida y hormonas tiroideas elevadas. Los anticuerpos antiperoxidasa tiroidea fueron positivos. Se inició tratamiento con metimazol y beta bloqueadores. Después de 20 días, la paciente regresó por presentar malestar general, fiebre, poliartralgia, lesiones cutáneas maculopapulares y edema de miembros inferiores. Los anticuerpos antinucleares fueron negativos y los anticuerpos anticitoplasma de los neutrófilos (ANCA, positivos. Se suspendió el metimazol y se inició prednisona. Después de 10 días de tratamiento, las molestias desaparecieron y la paciente recibió I 131.Las vasculitis asociadas al uso de tionamidas son poco frecuentes, no dependen de la dosis y están asociadas a la presencia de anticuerpos tipo ANCA. Clásicamente, afectan a los vasos pequeños de la piel; sin embargo, también pueden afectar los riñones y pulmones. El cuadro clínico se caracteriza por artralgias y mialgias. En algunos casos puede ocurrir insuficiencia renal de grado variable. En la mayoría de casos, el cuadro remite con la suspensión de la droga; pero, en algunos se requiere el uso de glucocorticoides o inmunosupresores.(Rev Med Hered 2011;22:147-150.

  1. Cefaleia por uso excessivo de medicamentos

    Directory of Open Access Journals (Sweden)

    Ariane Maria Fonseca MIRANDA

    2015-01-01

    Full Text Available Uma variante da cefaleia crônica diária, a cefaleia por uso excessivo de medicamentos é uma manifestação clínica de frequência ≥ 15 dias por mês, durante 3 meses. Possui um diagnóstico deficiente e um tratamento dividido em etapas, sendo a desintoxicação, a etapa de fundamental importância. Este artigo apresenta uma revisão sobre o tema, contribuindo para o esclarecimento das principais manifestações clínicas, principais teorias envolvendo sua fisiopatologia e a terapêutica farmacológica empregada. A metodologia utilizada foi uma revisão de publicações europeias e americanas, no período de 2001 a 2013, nos idiomas português, inglês e espanhol. Todos os medicamentos utilizados no tratamento sintomático das cefaleias são capazes de cronificar uma cefaleia preexistente, desde que sejam utilizados excessivamente, de forma regular e continuada. A suspensão de tais agentes terapêuticos resultará em melhoria na maioria dos pacientes, porém pode ser necessária a introdução de uma terapia de suporte de transição e/ou terapia profilática. Os tratamentos nao farmacológicos, quando associados ao farmacológico, ampliam a possibilidade de resultados satisfatórios, evitando recaídas.

  2. Intoxicación por Superwarfarinas

    OpenAIRE

    Patricia Crecente Otero; Jorge Luis Torres Triana; Ronald Macías Casanova; Luis Manuel Sánchez Rodríguez

    2012-01-01

    Las denominadas superwarfarinas se desarrollaron a partir de la década de 1970 como solución a las resistencias que habían desarrollado los roedores a los raticidas hasta entonces existentes1. Sus principales ventajas son su mayor potencia (hasta 100 veces más potentes que la warfarina)2 y el disponer de una semivida más larga (hasta 6-8 semanas). Presentamos el caso de un paciente varón que ingresa en nuestro servicio de Medicina Interna por otorragia y hematuria para estudio. Como único ant...

  3. Intoxicación ocupacional por mercurio

    OpenAIRE

    Augusto V Ramírez

    2008-01-01

    El mercurio, metal pesado ampliamente utilizado por el hombre, es muy tóxico; produce daño al sistema nervioso central, perturbaciones del comportamiento y lesiones renales. Se acumula en todos los seres vivos y no es esencial para ningún proceso biológico. La toxicidad del mercurio está directamente relacionada con su estado químico. El metilmercurio es la forma más dañina, con efectos neurotóxicos en adultos y en fetos de madres expuestas. El mercurio metálico no es menos tóxico. Las sales ...

  4. Refrigeración solar por eyector

    OpenAIRE

    Pizarro Romanillos, Raúl

    2014-01-01

    La finalidad de este trabajo es el estudio de un método de refrigeración que ayude a reducir el impacto medioambiental que producen otros sistemas de refrigeración más convencionales. Este método consiste en combinar la energía del Sol, que es renovable y gratuita, con un sistema de refrigeración por eyección que, a pesar de no tener alta eficiencia, tiene importantes ventajas como la de tener un bajo coste y una menor complejidad que otros sistemas. Para comenzar el estudio se hará un bre...

  5. Osteonecrosis de hueso maxilar inducida por bisfosfonatos

    OpenAIRE

    Vera Sempere, Francisco José

    2016-01-01

    Los bisfosfonatos son un grupo de fármacos, análogos de los pirofosfatos, utilizados en administración oral en el tratamiento de la osteoporosis, así como en formulaciones intravenosas para el tratamiento del dolor óseo y de la hipercalcemia ligada a la enfermedad tumoral metastasica (generalmente en el contexto de mieloma múltiple / cáncer de mama o próstata avanzados), actuando como un inhibidor de la reabsorción ósea, mediada por osteoclastos, así como de la apoptosis de los osteobl...

  6. Estudio del desgaste por deslizamiento en bronces

    OpenAIRE

    Carlos Holguín; John Coronado

    2007-01-01

    Se evaluaron tres bronces: SAE 67, nacional y americano usados típicamente como material de la chumacera en los molinos de caña de azúcar. Se realizaron pruebas desgaste por deslizamiento bajo la norma G77 usando bloques de bronce, anillos de acero SAE 1045 y aceite como lubricante. El tribómetro se calibró usando los anillos de acero SAE 4620 y se usó acero de herramienta SAE O1 para los bloques. Se realizaron metalografías, durezas y rugosidad de los materiales estudiados. El bronce naciona...

  7. Por uma arte no mundo da vida

    Directory of Open Access Journals (Sweden)

    Rachel Costa

    2016-12-01

    Full Text Available O artigo visa debater a análise colocada por Jacinto Lageira no texto “As razões do agir, contribuição a uma poética da ação”. O debate se estabelece no que concerne ao problema da autonomia da arte e suas consequências, tendo em vista a necessidade de pensar possibilidades contemporâneas para a experiência estética que pressuponham o mundo material. Isso é realizado a partir da teoria dos gestos do filósofo Vilém Flusser.

  8. Formação por ciclos

    OpenAIRE

    Nedbajluk,Lidia

    2006-01-01

    Artigo desenvolvido a partir dos estudos de Mestrado na Universidade Federal do Paraná, na linha de pesquisa Currículo, Conhecimento e Saberes nas Práticas Escolares, investigando a Formação por Ciclos. Analisa a diversidade de termos utilizados como complemento ao termo ciclos no ensino fundamental (Ciclos de Aprendizagem; Escola em Ciclos; Ensino em Ciclos; Ciclos de Desenvolvimento; Ciclos de Formação; Ciclo de Estudos) e esclarece a inadequação do uso dos mesmos indistintamente. Considera...

  9. Development of a chromatographic method for the study of the stability and compatibility of Mexican fuel oils; Desarrollo de un metodo cromatografico para el estudio de estabilidad y compatibilidad de combustoleos mexicanos

    Energy Technology Data Exchange (ETDEWEB)

    Blass Amador, Georgina; Panama Tirado, Luz Angelica [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1992-11-01

    compatibility of fuel oil mixes. [Espanol] En Mexico, la mayoria de la energia electrica producida proviene del uso de combustibles residuales pesados conocidos como combustoleos los cuales han sufrido disminuciones en la calidad debido a una combinacion de factores, entre los que destaca el de los cambios en el proceso de refinacion. Es necesario desarrollar metodos que sean capaces de indicar la inestabilidad (formacion de sedimento o incremento en viscosidad durante el almacenamiento o calentamiento) o incompatibilidad (formacion de sedimento al mezclar dos o mas) de los combustoleos utilizados en las centrales termoelectricas. El objetivo de este trabajo fue el desarrollar una prueba alternativa para el estudio de la compatibilidad y/o estabilidad de combustoleos mexicanos empleando cromatografia de liquidos de alta resolucion (CLAR) y asi poder determinar aspectos estructurales del combustoleo que determinan su estabilidad. Dado que la formacion de sedimentos ocurre cuando el poder disolvente del combustible es inadecuado para mantener los asfaltenos en solucion, es importante conocer la medida del poder disolvente o aromaticidad del diluyente; asi pues, la primera parte de este trabajo se centro en la determinacion del perfil de compuestos aromaticos de los diluyentes de los combustoleos, la otra parte se dedico a la determinacion del perfil de distribucion de los pesos moleculares de los asfaltenos presentes en los combustoleos. Los perfiles de la fraccion aromatica, asi como los de distribucion de pesos moleculares se determinaron empleando cromatografia de liquidos, en la que se empleo una variedad de columnas y de disolventes. Se efectuo una combinacion de pruebas de rutina tales como contenido de asfaltenos, equivalencia de tolueno, viscosidad, etcetera con el fin de obtener correlaciones con el metodo cromatografico desarrollado. En este articulo se discute solo la seccion correspondiente a la obtencion del perfil de contenidos de aromaticos de los combustoleos. Se

  10. Identification of some chemical constituents of Indigofera hirsuta Linn. (Fabaceae) by HPLC-ESI-MS (TOF) and evaluation of the anti radical activity; Identificacao de alguns constituintes quimicos de Indigofera hirsuta Linn. (Fabaceae) por de alguns constituintes quimicos de Indigofera hirsuta Linn. (Fabaceae) por CLAE-IES-EM (TOF) e avaliacao da atividade antirradicalar

    Energy Technology Data Exchange (ETDEWEB)

    Moura, Adriana Candido da Silva; Vilegas, Wagner; Santos, Lourdes Campaner dos [Universidade Estadual Paulista (UNESP), Araraquara, SP (Brazil). Inst. de Quimica.Dept. de Quimica Organica

    2011-07-01

    A rapid analytical approach, suitable to characterize the compounds present in the aqueous and methanol extracts prepared from the aerial parts of Indigofera hirsute, was developed. The method based on high-performance liquid chromatography coupled to mass spectrometry, electrospray positive ionization and detection by time of flight (HPLC-ESI-MS-TOF) identified, tryptophan, uracil, rutin, kempferol-3-O{beta}{sub -}-D-glucopyranoside, gallic acid and methyl gallate. The antiradical activity of this extract was evaluated using DPPH assay, with gallic acid as antiradical pattern. The study revealed the antiradical activity of methyl galatte (EC{sub 50} = 5 {+-} 0.3 {mu}g mL{sup -1}) gallic acid (EC{sub 50} = 5 {+-} 0.2 {mu}g mL{sup -1}) and rutin (EC{sub 50} = 21.6 {+-} 0.6 {mu}g m L{sup -1}), isolated from methanol extract (EC{sub 50} = 67.7 {+-} 0.9 {mu}g mL{sup -1}), which showed strong antiradical activity. (author)

  11. Ablation of burned skin with ultra-short pulses laser to promote healing: evaluation by optical coherence tomography, histology, {mu}ATR-FTIR and Nonlinear Microscopy; Ablacao de pele queimada com laser de pulsos ultra-curtos para promocao da cicatrizacao: avaliacao por tomografia por coerencia optica, histologia, {mu}ATR-FTIR e microscopia nao-linear

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Moises Oliveira dos

    2012-07-01

    Burns cause changes in the anatomical structure of the skin associated with trauma. The severity of the burn injury is divided into first, second and third-degree burns. The third-degree burns have been a major focus of research in search of more conservative treatments and faster results in repair for a functional and cosmetically acceptable. The conventional treatment is the use of topical natural or synthetic skin graft. An alternative therapy is the laser ablation process for burned tissue necrosis removal due to the no mechanical contact, fast application and access to difficult areas. The purpose of this study is to evaluate the feasibility of using high intensity femtosecond lasers as an adjunct treatment of burned patients. For this study, 65 Wistar rats were divided into groups of five animals: healthy skin, burned skin, two types of treatment (surgical debridement or femtosecond laser ablation) and four different times in the healing process monitoring. Three regions of the back of the animals were exposed to steam source causing third-degree burn. On the third day after the burn, one of the regions was ablated with high intensity ultrashort laser pulses ({lambda} = 785 nm, 90 fs, 2 kHz and 10 {mu}J/ pulse), the other received surgical debridement, and the last was considered the burn control. The regions were analyzed by optical coherence tomography (OCT), histology, attenuated total reflectance infrared spectroscopy using Fourier transform ({mu}-ATR-FTIR), two-photon excitation fluorescence microscopy (TPEFM) and second harmonic generation technique (SHG) on days 3, 5, 7 and 14 pos-treatments. The results showed that with the laser irradiation conditions used it was possible to remove debris from third degree burn. The techniques used to characterize the tissue allowed to verify that all treatments promoted wound healing. On the fourteenth day, the regeneration curve showed that the attenuation coefficient of laser ablated tissue converges to the values of healthy skin, but collagen fibers have not yet reached the same organization of those in the healthy skin. (author)

  12. Evaluation of immunity and protection induced in experimental models by soluble extract of Toxoplasma gondii tachyzoites irradiated by {sup 60}Co; Avaliacao da imunidade e protecao induzida em modelos experimentais por extrato soluvel de taquizoitos de Toxoplasma gondii irradiado por {sup 60}Co

    Energy Technology Data Exchange (ETDEWEB)

    Costa, Andrea da

    2013-07-01

    Toxoplasmosis affects 1/3 of the human population and only a vaccine for veterinary use. Gamma radiation alters the proteins making them more immunogenic by oxidation and better antigen presentation in the absence of adjuvants. Radiate soluble extract of RH strain tachyzoites of T. gondii (AgTg), and evaluate its use as a vaccine in BALB/c. Doses below 500Gy not affected and destroyed 2000Gy doses above extract, whereas animals immunized with irradiated extract at 1000, 1500 and 2000Gy had more of specific IgG avidity , compared to native AgTg (p<0,05) . AgTg 1500GY the immunized animals had increased proliferation of splenocytes, phenotyped as CD3+CD4+, CD3+CD8+ and B-lymphocytes immunized animals compared to the native AgTg . Animals immunized by AgTg 1500GY after challenge with strain ME- 49 cystogenic showed lower number of brain cysts and greater survival after challenge with virulent RH. Ionizing radiation in extracts of T. gondii increases the immune response and immune memory in the absence of adjuvants. (author)

  13. Tribological evaluation for experimental design Al{sub 2}O{sub 3} obtained via low pressure injection moulding (LPIM); Avaliacao tribologica por planejamento experimental da Al{sub 2}O{sub 3} obtida via moldagem por injecao em baixa pressao (MIBP)

    Energy Technology Data Exchange (ETDEWEB)

    Dotta, A.L.B.; Costa, C.A.; Farias, M.C.M. [Universidade de Caxias do Sul (UCS), RS (Brazil); Cunha, M.A da, E-mail: alinebandotta@gmail.com [Universidade Federal do Rio Grande do Sul (UFRGS), Caxias do Sul, RS (Brazil)

    2016-07-01

    This work represents the tribological study of Al{sub 2}O{sub 3} obtained by LPIM using the experimental design technique to evaluate the interaction of the tribological parameters with the friction and wear. The LPIM process was performed at 90 °C for 24 h. The average friction coefficient for the factorial experimental design varied significantly with the load and the speed when Al{sub 2}O{sub 3} was tested with the steel counter body. In general, the wear coefficient was lower for the tribological pair Al{sub 2}O{sub 3}-steel, in which occurred the formation of an iron oxide tribofilm on the surface. As for the Al{sub 2}O{sub 3}-Al{sub 2}O{sub 3} pair, an intergranular fracture of the surface occurred, in addition to the presence of material adhered on the tracks. (author)

  14. Evaluation of seawater contamination with benzene, toluene and xylene in the Ubatuba north coast, SP region, and study of their removal by ionizing radiation; Avaliacao da contaminacao da agua do mar por benzeno, tolueno e xileno na regiao de Ubatuba, litoral norte (SP) e estudo da degradacao destes compostos por radiacao ionizante

    Energy Technology Data Exchange (ETDEWEB)

    Almeida, Kelly Cristina Santana de

    2006-07-01

    A major concern with leaking petroleum is the environmental contamination by the toxic and low water-soluble components such as benzene, toluene, and xylenes (BTX). These hydrocarbons have relatively high pollution potential because of their significant toxicity. The objective of this study was to evaluate the contamination of seawater by the main pollutants of the output and transport of petroleum, such as benzene, toluene, and xylene, and their removal by the exposure to the ionizing radiation. The studied region was Ubatuba region, SP, between 23 deg 26'S and 23 deg 46'S of latitude and 45 deg 02'W and 45 deg 11'W of longitude, area of carry and output of petroleum, and samples were collected from November, 2003 to July, 2005. For BTX in seawater analysis, the Purge and Trap concentrator with FIDGC detector showed significantly higher sensibility than Head Space concentrator with MSGC detector. The minimal detected limits (MDL) obtained at FIDGC were of 0.50 {mu}g/L for benzene, 0.70 {mu}g/L for toluene, and 1.54 {mu}g/L for xylene, and the obtained experimental variability was 15%. While the concentrator type Headspace system with MS detector showed higher MLD, about of 9.30 mg/L for benzene, 8.50 mg/L for toluene, and 9.80 mg/L for xylene, and 10% of experimental variability. In the studied area the benzene concentration varied from 1.0 {mu}g/L to 2.0 {mu}g/L, the concentration of toluene varied from < 0.70 {mu}g/L to 3.24 {mu}g/L and the maximum value of xylene observed was of 2.92 {mu}g/L. The seawater samples contaminated with BTX standard and exposed to ionizing radiation using a source of {sup 60}Co, presented a removal from 10% to 40% of benzene at 20 kGy absorbed doses and concentration of 35.1 mg/L and 70.2 mg/L, respectively; from 20% to 60% of toluene removal with 15 kGy absorbed dose and from 20% to 80% of xylene with 15 kGy absorbed dose in similar concentrations. (author)

  15. Assessment of environmental impact of ultraviolet radiation or electron beam cured print inks on plastic packaging materials; Avaliacao do impacto ambiental gerado por tintas graficas curadas por radiacao ultravioleta ou feixe de eletrons em materiais para embalagens plasticas convencionais ou biodegradaveis pos-consumo

    Energy Technology Data Exchange (ETDEWEB)

    Bardi, Marcelo Augusto Goncalves

    2014-07-01

    The high level of pollution generated by the inadequate disposal of polymeric materials has motivated the search for environmentally friendly systems and techniques such as the application of biodegradable polymers and the replacement of the solvent-based paint systems by those with high solids content, based water or cured by radiation, practically free of volatile organic compounds. However, the cured polymer coatings are neither soluble nor molten, increasing the complexity of the reprocessing, recycling and degradation. Thus, this work aimed to develop print inks modified with pro-degrading agents, cured by ultraviolet radiation or electron beam, for printing or decoration in plastic packaging products of short lifetime, which are biodegradable or not. Six coatings (varnish and inks in five colors: yellow, blue, white, black and red), three pro-degrading agents (cobalt stearate, cerium stearate and manganese stearate), five polymeric substrates (Ecobras®, low density polyethylene and its respective modifications with pro-degrading agents). The coatings were applied to the substrates and cured by ultraviolet radiation or electron beam, resulting in 180 samples. These materials were then exposed to accelerated aging chamber, type 'QUV', and composting in natural environment. In order to assess the effects of the polymer coatings on the degradation process of the specimens, only the yellow and black samples were exposed to a controlled composting environment via respirometry, reducing to 16 the number of samples. The organic compound generated by the biodegradation process was analyzed by the ecotoxicity tests. It was observed that the coating layer acted as a barrier that inhibits degradation of the plastic when exposed to weathering. The addition of pro-degrading agents promoted acceleration in the degradation process, promoting the migration of the metal ion to the medium without affecting the final quality of the organic compost. (author)

  16. Evaluation of essential trace elements in preterm and full term milk and childhood formulas by neutron activation analysis; Avaliacao dos teores de elementos essenciais no leite materno de maes de recem-nascidos prematuros e a termo e em formulas infantis por meio da analise por ativacao com neutrons

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Paola de Souza

    2009-07-01

    Many studies have emphasized the need of trace elements during infancy and their adequate availability in human milk. Deficiency of minor and trace elements can lead to various disorders in infants. During early childhood trace element requirements, are more critical due to faster growth rates. In this study, Ca, Cl, Fe, K, Mg, Mn, Na, Se and Zn were determined in human colostrum samples from mothers of preterm and full-term newborns. Samples were collected by manual expression from the first to the fifth day after birth. After collection, human colostrum samples were frozen and freeze-dried for analyses. Few of the most commonly commercialized were also analyzed. The essential element concentrations were determined in 30 colostrum samples and 17 milk formula brands by Instrumental Neutron Activation Analysis. Multivariate analyses were applied and the results were separated in two clusters. However the separation was not related to the corresponding gestational age. Results of this study showed that the concentration levels of the essential element Ca, K and Na in the milk formula samples analyzed were in agreement with the printed information on the labels. All concentration levels were also within ANVISA and Codex Allimentarius recommended values and thus adequate for infant nutritional needs. (author)

  17. Evaluation of seawater contamination with benzene, toluene and xylene in the Ubatuba north coast, SP region, and study of their removal by ionizing radiation; Avaliacao da contaminacao da agua do mar por benzeno, tolueno e xileno na regiao de Ubatuba, litoral norte (SP) e estudo da degradacao destes compostos por radiacao ionizante

    Energy Technology Data Exchange (ETDEWEB)

    Almeida, Kelly Cristina Santana de

    2006-07-01

    A major concern with leaking petroleum is the environmental contamination by the toxic and low water-soluble components such as benzene, toluene, and xylenes (BTX). These hydrocarbons have relatively high pollution potential because of their significant toxicity. The objective of this study was to evaluate the contamination of seawater by the main pollutants of the output and transport of petroleum, such as benzene, toluene, and xylene, and their removal by the exposure to the ionizing radiation. The studied region was Ubatuba region, SP, between 23 deg 26'S and 23 deg 46'S of latitude and 45 deg 02'W and 45 deg 11'W of longitude, area of carry and output of petroleum, and samples were collected from November, 2003 to July, 2005. For BTX in seawater analysis, the Purge and Trap concentrator with FIDGC detector showed significantly higher sensibility than Head Space concentrator with MSGC detector. The minimal detected limits (MDL) obtained at FIDGC were of 0.50 {mu}g/L for benzene, 0.70 {mu}g/L for toluene, and 1.54 {mu}g/L for xylene, and the obtained experimental variability was 15%. While the concentrator type Headspace system with MS detector showed higher MLD, about of 9.30 mg/L for benzene, 8.50 mg/L for toluene, and 9.80 mg/L for xylene, and 10% of experimental variability. In the studied area the benzene concentration varied from 1.0 {mu}g/L to 2.0 {mu}g/L, the concentration of toluene varied from < 0.70 {mu}g/L to 3.24 {mu}g/L and the maximum value of xylene observed was of 2.92 {mu}g/L. The seawater samples contaminated with BTX standard and exposed to ionizing radiation using a source of {sup 60}Co, presented a removal from 10% to 40% of benzene at 20 kGy absorbed doses and concentration of 35.1 mg/L and 70.2 mg/L, respectively; from 20% to 60% of toluene removal with 15 kGy absorbed dose and from 20% to 80% of xylene with 15 kGy absorbed dose in similar concentrations. (author)

  18. Calculos de potenciais de ionização de algumas bases e aza-analogas utilizando o metodo semi-empirico HAM/3

    OpenAIRE

    Jose Jair Vianna Cirino

    1994-01-01

    Resumo: Inicialmente procedeu-se a otimização de geometrias das bases purinas guanina, 8-azaguanjna, xantina, 8-azaxantina e hipoxantina com o uso dos métodos semi-empíricos MNDO, AMI e MNDO-PM3. Nesta etapa também fez-se uso de métodos ab initio utilizando o conjunto de base cep-31G. Os potenciais de ionização dos elétrons do caroço das bases purinas foram calculados posteriormente por meio do método semi-empírico HAM/3 empregando as geometrias otimizadas pelos métodos semi-empíricos na etap...

  19. Nodulose por Metotrexato Methotrexate Induced Nodulosis

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    Fernanda Guidolin

    2005-08-01

    Full Text Available A nodulose por metotrexato (MTX é um dos efeitos colaterais pouco conhecidos do uso desse medicamento em doses baixas. Embora classicamente descrita em casos de artrite reumatóide, tem aparecido, também, em outras doenças reumáticas. Descreve-se aqui um caso de nodulose por MTX em uma paciente com artrite reumatóide soropositiva, que utilizava esse medicamento há um ano, com bom controle do processo articular. Segue-se uma breve revisão sobre o assunto.Methotrexate-induced nodulosis is a rare side effect of this drug when it is used in low doses. Although classically described in rheumatoid arthritis patients, it may also appear in other rheumatic disorders. We describe a seropositive rheumatoid arthritis patient who developed methotrexate-induced nodulosis after using this drug for a year, with good control of articular symptoms. This case presentation is followed by a brief revision on the subject.

  20. Investigando o Consumo de Lazer por Idosos

    Directory of Open Access Journals (Sweden)

    Marcelo de Rezende Pinto

    2015-06-01

    Full Text Available A partir da constatação de que ainda são incipientes os estudos que buscam investigar a perspectiva cultural do consumo, atrelada à percepção de que pouco se pesquisou sobre o consumo de lazer de consumidores da terceira idade, o artigo tem por objetivo geral apresentar resultados de uma pesquisa empírica cujo objetivo foi investigar como as experiências de consumo nas atividades de lazer por indivíduos da terceira idade interagem com o sistema cultural e simbólico envolvido no fluxo da vida social cotidiana. Para se atingir esses objetivos, adotou-se uma perspectiva interpretativa de investigação, a partir de uma abordagem etnográfica. Os resultados parecem indicar que os processos sociais, desde a construção de relacionamentos entre familiares, amigos e vizinhos até a construção de redes de convivência com integrantes dos clubes de terceira constituem-se os principais processos presentes nas atividades de lazer desses indivíduos.

  1. Reacciones adversas por antiinflamatorios no esteroideos

    Directory of Open Access Journals (Sweden)

    Luisa Ivet Sánchez Ricardo

    2011-03-01

    Full Text Available Se realizó un estudio descriptivo y transversal en el Consultorio Médico de la Familia No. 28 perteneciente al Policlínico Universitario y Docente "Dr. Mario Muñoz Monroy" desde el 1ro. de junio al 31 de diciembre de 2008, con el objetivo de detectar las reacciones adversas más frecuentes provocadas por el consumo de antiinflamatorios no esteroideos. El universo estuvo constituido por 105 pacientes que asistieron a consulta en el tiempo de estudio y de estos se seleccionó una muestra de 60 pacientes, a quienes se les aplicó un cuestionario de preguntas donde se recogieron las variables de análisis. .Las mujeres resultaron las que más antiinflamatorios consumieron y en el rango de edades de 31-59 años. Las reacciones adversas que más se reportaron fueron la epigastralgia y la hipertensión arterial, así mismo se comprobó la automedicación en algunos pacientes.

  2. Hipotiroidismo inducido por Amiodarona: Reporte de caso

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    Jorge Luis Salinas Arce

    2012-03-01

    Full Text Available Se describe el caso de una mujer de 57 años de edad, con diagnóstico de síndrome de Wolf Parkinson White, en tratamiento con amiodarona 200 mg/día; que acudió por presentar palpitaciones, fatiga y aumento de sueño. Al examen físico no se encontró bocio, pero los reflejos osteotendinosos estaban prolongados. Los exámenes auxiliares mostraron TSH elevado, T4 libre disminuido y anticuerpos antiperoxidasa tiroidea negativos. Se suspendió la amiodarona y se inició levotiroxina. Después de dos meses; los niveles de TSH y T4 libre eran normales y la paciente no presentaba molestias. La amiodarona está asociada a diversos efectos adversos que pueden limitar su uso. Entre estos efectos adversos, se describe el hipotiroidismo inducido, que se caracteriza por TSH elevado, T4 libre disminuido y síntomas inespecíficos como fatiga, intolerancia al frío y piel seca. El tratamiento de elección es la levotiroxina.

  3. Lucro por ação

    Directory of Open Access Journals (Sweden)

    Gabriel Moreira Campos

    2001-08-01

    Full Text Available Este trabalho tem por objetivo demonstrar os principais conceitos acerca do Lucro por Ação (Earnings per Share, o qual se apresenta como um quociente de grande utilidade nas entidades. Serão demonstrados aspectos sobre o assunto presentes no Brasil, bem como as normas aplicáveis nos Estados Unidos, emanadas do Financial Accounting Standards Board (FASB, e as normas internacionais, emanadas do International Accounting Standards Committee (IASC. De forma a possibilitar uma visualização mais completa dos conceitos envolvidos, serão desenvolvidos exemplos de sua aplicação. O Lucro (Resultado por Ação pode ser calculado em sua forma básica e em sua forma diluída. Na forma básica, não são considerados os efeitos dos instrumentos potencialmente dilutivos, ao passo que, no cálculo do Lucro (Resultado por Ação Diluído, são. Como instrumentos financeiros potencialmente dilutivos temos as ações preferenciais conversíveis, as debêntures conversíveis e os bônus de subscrição, que podem ser convertidos em ações ordinárias, caracterizando, assim, o próprio potencial dilutivo desses instrumentos. Dessa forma, o trabalho em questão foi dividido em três partes principais, sendo que nas duas últimas constam os referidos exemplos de cálculo do Lucro por Ação em sua forma básica e em sua forma diluída: • aspectos observados no Brasil; • normas emanadas do FASB; • normas emanadas do IASC.The objective of this paper is to demonstrate the principal concepts about Earnings per Share, which is presented as a quotient of great usefulness for the companies. The subject is presented in three parts: in the first part, we will demonstrate relevant aspects that are present in Brazil. In the second part, the applicable standards in the United States will be discussed, which are issued by the Financial Accounting Standards Board (FASB. In the third part, the international standards are dealt with, which are issued by the

  4. Some Possibilities of the Eddy-Current Method for Multi-Parameter Testing of Structural Components; Quelques Possibilites Offertes par la Methode des Courants de Foucault pour le Controle de Nombreux Parametres des Elements de Construction; Nekotorye vozmozhnosti metoda vikhrevykh tokov dlya mnogoparametrovogo kontrolya ehlementov konstruktsij; Algunas Posibilidades que Brinda el Metodo de las Corrientes de Foucault para Controlar Numerosos Parametros de los Elementos de Construccion

    Energy Technology Data Exchange (ETDEWEB)

    Vjahorev, V. G.; Gerasimov, V. G.; Deniskin, V. P.; Trahtenberg, L. I.; Shkarlet, Ju. M. [Gosudarstvennyj Komitet po Ispol' zovaniju Atomnoj Jenergii SSSR, Moskva, SSSR (Russian Federation)

    1965-09-15

    donnees calculees et experimentales, les auteurs indiquent diverses possibilites de realisation de detecteurs a courants de Foucault de frequence unique permettant le controle avec modification simultanee de plusieurs parametres. (author) [Spanish] Los autores demuestran que los problemas del control no destructivo de diversos parametros se plantean en la tecnologia nuclear segun ciertas leyes y que el metodo de las corrientes de Foucault se adapta particularmente a la solucion de varios de esos problemas. Los autores justifican la utilizacion de modelos electricos para resolver problemas de control con ayuda de una larga bobina hueca. Presentan formulas y exponen un metodo para el calculo de detectores a base de corrientes parasitas. Describen un dispositivo que permite verificar el espesor de las paredes de tubos; en este dispositivo, el desplazamiento del tubo a controlar no ejerce influencia alguna sobre los resultados de las mediciones, gracias al empleo de un monitor accionado por una senal dependiente de la fase de tension del detector. En calidad de detector se ha empleado un dispositivo destinado al control de los tubos de un autogenerador despues de haber incluido en su circuito una bobina de ensayo. Partiendo de datos calculados y experimentales, los autores senalan diversas posibilidades de realizacion de detectores a base de corrientes de Foucault de frecuencia unica, que permiten efectuar el control con modificacion simultanea de varios parametros. (author) [Russian] Pokazana zakonomernost' voznikno- venija zadach o nerazrushajushhem mnogoparametrovom kontrole v jadernoj tehnologii i celeso- obraznost' reshenija nekotoryh iz nih metodom vihrevyh tokov. Obosnovano primenenie jelektricheskih modelej dlja reshenija zadach kontrolja s ispol'zovaniem dlinnoj prohodnoj katushki. Privodjatsja raschetnye formuly i izlagaetsja metodika rascheta nakladnyh toko- vihrevyh datchikov. Opisana shema pribora dlja kontrolja tolshhiny stenki trub, v kotorom vlijanie pereme

  5. New Methods and Facilities for the Measurement of Physical Properties of Reactor Components and Irradiated Materials; Nouveaux Procedes et Instruments de Mesure des Proprietes Physiques des Elements de Reacteur et des Matieres Irradiees; Novye metody i sredstva izmereniya fizicheskikh s vojstv komponentov reaktora i obluchennykh materialov; Nuevos Metodos y Equipos para Medir Propiedades Fisicas de Componentes de Reactor y de Materiales Irradiados

    Energy Technology Data Exchange (ETDEWEB)

    Foerster, F.; Mueller, P. [Institut Dr. Foerster, Reutlingen, Federal Republic of Germany (Germany)

    1965-09-15

    zone 'chaude ' du reacteur. Ils discutent la relation entre la conductivite electrique et la dose d'irradiation. Les auteurs decrivent un instrument de mesure de la permeabilite, de la remanence et de la force co- ercitive en fonction des contraintes mecaniques, de la deformation elastique et inelastique et de la dose d'irradiation. Ils donnent des mesures de la variation des proprietes magnetiques en fonction des contraintes elastiques et de la deformation inelastique. Ils etudient les effets de l'irradiation sur la permeabilite et sur la force coercitive. Les auteurs decrivent un instrument permettant la mesure rapide et la lecture directe de la permeabilite des elements en acier inoxydable. Ils expliquent la correlation entre la permeabilite et la teneur en ferrite {Delta}. Us discutent certaines mesures du pourcentage de ferrite {Delta} dans les soudures de tubes en acier inoxydable ainsi que certaines mesures de precipitation de ferrite {Delta} en fonction de la deformation inelastique (forgeage a la main d'elements combustibles pour reacteurs). (author) [Spanish] Se describe un intrumento para medir y registrar en forma totalmente automatica el modulo de Young, el modulodecorte y la capacidad de amortiguamiento, en funcion de la temperatura y el tiempo. El modulo de Young se determina excitando muestras de diversos tamanos con sus frecuencias naturales, mientras que la capacidad de amortiguamiento se mide en funcion de la libre atenuacion de la vibracion, o bien por la anchura media de la curva de resonancia. Se presentan ejemplos de medidas de la recuperacion despues de provocar danos por irradiaciones y deformaciones plasticas asf como grado de grafitacion. Se describe la deteccion de fallas y variaciones de densidad en barras de grafito. Se explica, ademas, un metodo para investigar la retencion de pastillas de UO{sub 2} en tubos austenfticos de pared delgada. Se describe un horno especial para estudiar el comportamiento elastico e inelastico de muestras

  6. Theorical and experimental study of the induced forces by the mixed, divergent, convergent and straight labyrinth of seal systems on the steam turbines, gas turbines and compressor rotors; Estudio teorico-experimental de las fuerzas inducidas por los sistemas de sellos de laberinto rectos, convergentes, divergentes y mixtos sobre los rotores de turbinas de vapor, turbinas de gas y compresores

    Energy Technology Data Exchange (ETDEWEB)

    Salazar San Andres, Octavio Ramon

    1991-12-31

    A theoretical and experimental research is conducted in order to determine the labyrinth seal forces, as well as the stiffness and damping coefficients for straight, convergent, divergent, and combined shapes on turbine and compressor rotors. The mathematical model is deduced on the basis of the single volume method and its solution is obtained by the perturbation procedure. The validation is achieved with published results. Experimental work carried out on a test bench is described in the text. This involved labyrinth seals with straight, convergent, and divergent profiles, as the published information relating to mixed type is sufficient to perform the evaluation. The conclusions demonstrate that the model is able to predict and determine the performance of labyrinth seals based on forces and rotordynamic coefficients for static and dynamic motions. Finally, tests on real steam turbines of 300 MW are recommended. In this case the high pressures and use of wheels with strips on the periphery and supported by the upper part of blades, increase the susceptibility of self excited subsynchronous vibrations. [Espanol] Se presenta una investigacion teorica-experimental relacionada con la obtencion y validacion de un modelo matematico capaz de predecir las fuerzas y los coeficientes de rigidez y amortiguamiento de los sellos de laberinto de tipo recto, convergente, divergente y mixto que se emplean en turbinas y compresores tanto terrestres como aereos. El modelo matematico propuesto se deduce a partir del metodo de un solo volumen y su solucion se obtiene a traves de metodos perturbatorios. La validacion del mismo se consigue al comparar con resultados experimentales publicados en revistas especializadas y con los datos medidos en un banco de pruebas cuya descripcion se incluye en el trabajo, cualculado para sellos rectos, convergentes y divergentes, ya que la informacion publicada respecto al tipo mixto o combinado es suficiente. Las conclusiones de la investigacion

  7. La Violencia Latinoamericana vista por los Economistas

    Directory of Open Access Journals (Sweden)

    Salama Pierre

    2003-08-01

    Full Text Available

    Salama, Pierre. "La Violencia Lationoamericana vista por los Economistas", Cuadernos de Economía, V. XXII, n. 38, Bogotá, 2003 páginas 179-198.

    Este articulo sintetiza los estudios económicos publicados recientemente sobre la violencia en América Latina y analiza las causas suceptibles a acrecentarla: pobreza, desigualdad de los ingresos en nivel y variación, impunidad, diferencia entre la probabilidad de ser arrestado y la severidad de la pena impuesta, y narcotrafico. Sin embargo, la explicación de la violencia no se limitará a los factores económicos, puesto que el autor privilegia un enfoque inspirado en la antropología y la sociología.

  8. Toxicidad por óxido de etileno

    Directory of Open Access Journals (Sweden)

    Téllez M. Jairo A.

    1993-08-01

    Full Text Available

    El óxido de etileno, es un compuesto epóxido gaseoso, ampliamente utilizado en nuestro medio como agente esterilizante y de desinfección en instituciones hospitalarias. Los estudios realizados en varios países han demostrado efectos sobre la salud humana, caracterizados por  hipersensibilidad dérmica, irritación del tracto respiratorio, irritación ocular, excitación del S.N.C. y se asocia con presencia de abortos expontáneos, aberraciones cromosómicas e irritación crónica de laringe y tráquea en personal expuesto ocupacionalmente.

  9. Infeções alimentares por Campylobacter

    OpenAIRE

    Neto, Carlota Duarte Castro

    2017-01-01

    Dissertação para obtenção do grau de Mestre no Instituto Superior de Ciências da Saúde Egas Moniz Após o isolamento bem-sucedido em fezes na década de setenta do século passado (1972), Campylobacter tornou-se rapidamente a espécie bacteriana mais comumente associada a doenças diarreicas em todo o mundo. A infeção por Campylobacter provoca um espectro de doenças, incluindo enterite aguda, infeções extra-gastrointestinais e complicações pós-infeciosas. A doença gastrointestinal autolimita...

  10. fluidizado por proceso autotérmico

    Directory of Open Access Journals (Sweden)

    ZULAMITA ZAPATA BENABITHE

    2005-01-01

    Full Text Available El presente trabajo se basa en el estudio de la producción de carbón activado a partir de carbón mineral subbituminoso en un reactor de lecho fluidizado por proceso autotérmico. El carbón utilizado provino de la región de Amagá (Antioquia - Colombia y fue activado en dos reactores de lecho fluidizado de diferente diámetro interno, 10 cm y 22 cm. Los valores del área superficial específica y el volumen de poro de las muestras activadas fueron determinados a partir de las isotermas de N2 y CO2. Los resultados experimentales mostraron que los valores de áreas superficiales BET y DR y del Índice de Yodo se encontraron alrededor de 460 m2/g (SBET, 490 m2/g (SDR y 460 mg I2/g carbón.

  11. Metodo integrado para la gestion de Universidades basado en el Balanced Scorecard (bsc y el modelo europeo de calidad (efqm: caso U.C.S.M.

    Directory of Open Access Journals (Sweden)

    Edwing Jesús Ticse Villanueva

    2010-06-01

    Full Text Available http://dx.doi.org/10.5007/1983-4535.2010v3n1p01   El presente Trabajo realiza la propuesta de un Método Integrado  que permite mejorar la competitividad en la Gestión de las Universidades, este método se basa: En una herramienta de Gestión Estratégica: el Balanced Scorecard (BSC, que fue creada por Kaplan y Norton en 1992; y En el Modelo  Europeo de Calidad (EFQM, que fue desarrollado como un Modelo de Excelencia en 1991. La metodología utilizada consiste en analizar las características, ventajas y limitaciones del BSC y el EFQM para aplicarlos simultáneamente en la gestión de Tomando como base los 9 criterios del EFQM, se desarrolla un Mapa Estratégico del BSC, para que se alineen todas las perspectivas hacia el logro de los Objetivos Estratégicos de la Organización. El método integrado planteado se aplica en el caso de la Universidad Católica de Santa María (Arequipa- Perú, donde se analiza las ventajas que implicaría la implementación del mismo

  12. Metodo integrado para la gestion de Universidades basado en el Balanced Scorecard (bsc y el modelo europeo de calidad (efqm: caso U.C.S.M.

    Directory of Open Access Journals (Sweden)

    Horacio Vicente Barreda Tamayo

    2010-12-01

    Full Text Available El presente Trabajo realiza la propuesta de un Método Integrado que permite mejorar la competitividad en la Gestión de las Universidades, este método se basa: En una herramienta de Gestión Estratégica: el Balanced Scorecard (BSC, que fue creada por Kaplan y Norton en 1992; y En el Modelo Europeo de Calidad (EFQM, que fue desarrollado como un Modelo de Excelencia en 1991. La metodología utilizada consiste en analizar las características, ventajas y limitaciones del BSC y el EFQM para aplicarlos simultáneamente en la gestión de Tomando como base los 9 criterios del EFQM, se desarrolla un Mapa Estratégico del BSC, para que se alineen todas las perspectivas hacia el logro de los Objetivos Estratégicos de la Organización. El método integrado planteado se aplica en el caso de la Universidad Católica de Santa María (Arequipa- Perú, donde se analiza las ventajas que implicaría la implementación del mismo.

  13. Aplicación del metodo delphi en el diseño de una investigación cuantitativa sobre el fenómeno FABLAB

    Directory of Open Access Journals (Sweden)

    Mª Elena García-Ruiz

    2018-05-01

    Full Text Available La facilidad de acceso a la tecnología ha propiciado la llegada de una nueva revolución industrial que capacita a los ciudadanos para dejar de ser meros usuarios y convertirse en creadores y constructores de sus propios bienes, apoyándose en las tendencias sociales basadas en la cultura colaborativa. El surgimiento de los Fablab -Fabrication Laboratory- como entornos que potencian dichas capacidades en los usuarios ha sido decisiva en esta democratización tecnológica, y sigue un ritmo creciente incesante, extendiéndose de forma llamativa por todo el planeta. A través de siete etapas, descritas en este artículo, se presenta el proceso de construcción y validación de la herramienta de obtención de información denominada FabLab Global Survey con el objetivo de conocer y caracteriza el fenómeno FabLab. La falta de referentes teóricos y la limitada bibliografía académica sobre el tema hace necesario el diseño de dicha herramienta basándonos en aportaciones de los expertos en el fenómeno FabLab y, para ello, se consideró adecuada su validación mediante el método Delphi, ya que permite la transmisión de la información subjetiva aportada por los expertos, respetando sus peculiaridades. El reto al que nos enfrentamos como investigadores estriba en nuestra capacidad de transformar los resultados obtenidos para su valoración a través de herramientas analíticas cuantitativas. Para compensar y equilibrar la subjetividad de las opiniones expresadas por el panel de expertos mediante escalas nominales, se emplea el Modelo de Torgerson, que permite un reescalamiento de la escala original cualitativa en una escala de intervalo (cuantitativa verificando la equivalencia entre ellas. Asimismo, y una vez contrastada la adecuación de la escala utilizada, se realiza un análisis cuantitativo y cualitativo de las aportaciones generadas por el grupo de expertos que permiten perfilar las características del cuestionario resultante. La

  14. Uso de métodos anticoncepcionais entre adolescentes universitários El uso de metodos anticonceptivos en adolescentes universitarios Use of contraceptive methods among university adolescents

    Directory of Open Access Journals (Sweden)

    Aline Salheb Alves

    2008-04-01

    Full Text Available Objetivou-se identificar o uso de métodos anticoncepcionais entre adolescentes, ingressantes de uma universidade pública paulista e descrever o perfil desses universitários quanto a algumas características sócio-demográficas. Foi utilizado um questionário e a amostra foi composta por 295 adolescentes. Relataram ter iniciado atividade sexual 48,8%. A idade média para o início foi aos 17 anos, e a maioria relatou ter usado um método contraceptivo. O método mais utilizado foi o preservativo e este em combinação com a pílula, principalmente. Observou-se que os adolescentes buscam informações, seja através de profissionais da saúde, professores, ou através de livros, com destaque para a mídia. Conclui-se que os universitários iniciam atividade sexual mais tardiamente e buscam conhecimento sobre anticoncepção.El objetivo de este trabajo es identificar el uso de los métodos anticonceptivos entre adolescentes, alumnos de una universidad paulista, y describir su perfil basados en algunas características socio-demográficas. Se utilizó un cuestionario aplicado a 295 adolescentes. El 48,8% relataron haber iniciado actividad sexual. En media, la edad para el inicio son los 17 años y la mayoría afirma haber usado métodos anticonceptivos. El más utilizado fue, principalmente, el preservativo combinado con la píldora. Se observó que los adolescentes buscan información consultando a profesionales de la salud, profesores o a través de libros, y sobretodo por los medios de comunicación. Se concluye que los universitarios inician su actividad sexual más tarde y buscan conocimiento sobre métodos anticonceptivos.The objective of this study was to identify the use of contraceptive methods among teenagers at a public University in São Paulo, as well as to describe their profile concerning social and demographic characteristics. A questionnaire was used and the sample was composed by 295 teenagers. The initiation of sexual activity

  15. Autoagresión por quemaduras

    Directory of Open Access Journals (Sweden)

    Iris Montes de Oca

    1996-04-01

    Full Text Available Se realizó un estudio epidemiológico transversal en los casos de autoagresión por quemaduras, que acudieron al Cuerpo de Guardia del Servicio de Quemados del Hospital "Dr. Ernesto Guevara de la Serna", durante el período comprendido entre los meses de febrero de 1993 y febrero de 1994, con la finalidad de determinar el comportamiento de algunas variables de interés en estos casos. El universo de estudio lo constituyeron 57 casos, cuya información se recolectó de la gráfica general del paciente quemado (Modelo 71-05 y de los registros estadísticos del Servicio de Quemados del Hospital. Como fundamentales resultados y conclusiones se obtienen las siguientes: la mayor frecuencia de casos se encontró en las edades comprendidas entre 15 y 24 años; el sexo femenino resultó ser el más afectado en todos los grupos de edades. La cocina fue el lugar donde se efectuó el acto con mayor frecuencia. Se encontró un alto grado de asociación entre la supervivencia y la presencia de antecedentes de intentos suicidas. Presentaron la mayor incidencia por municipios los de Puerto Padre y Jobabo; el alcohol y el kerosene fueron los agentes causales más utilizados. En la casuística predominaron los grandes quemados.A transversal epidemiological study of the cases of self-aggression by burns, who received medical attention at the Emergency Department of the Burns Service of the "Dr. Ernesto Guevara de la Serna" Hospital from February, 1993 to February, 1994, was carried out aimed at determining the behaviour of some variables of interest in these cases. Fifty seven cases were studied and the information was collected from the general graph of the burn patient (Model 71-05, and from the statistical records of the Burns Service of the hospital. The main results and conclusions reached are the following: the highest frequency of cases was found in ages between 15 and 24; women were the most affected in all age groups; and kitchen was the place where the

  16. Nefrectomía simple por puerto único (LESS) asistida por robot (da Vinci)

    OpenAIRE

    CASTILLO C,OCTAVIO A; VIDAL M,IVAR; SEPÚLVEDA T,FRANCISCO

    2011-01-01

    Introducción: La cirugía mínimamente invasiva en urología avanza rápidamente y la cirugía laparo-endoscópica a través de puerto único (LESS) no es la excepción. Esta técnica por vía laparoscópica presenta mucha dificultad y requiere de un cirujano laparoscópico experimentado debido a la falta de triangulación y el cruce de los instrumentos. Los beneficios del sistema quirúrgico da Vinci® han sido introducidos recientemente en LESS. Presentamos dos casos de nefrectomía LESS asistida por robot....

  17. Consumo Voluntario de Forraje por Rumiantes en Pastoreo Consumo Voluntario de Forraje por Rumiantes en Pastoreo

    Directory of Open Access Journals (Sweden)

    José Mejía Haro

    2012-02-01

    Full Text Available The variation in voluntary forage intake is undoubtedly the major dietary factor determining level and efficiency of ruminant production. This variation is bigger and least predictable for grazing ruminants. Range ruminant productivity and efficiency is relatively low due, partly, to intake limitations; productivity could probably be increased most by increasing intake. Distension of the reticulo-rumen wall is the primary intake regulation mechanism of low-quality roughages in range ruminants, digestibility and rate of ingest passage also affect voluntary intake. Body size and metabolic bodysize as well affect intake of grazing animals. Kind and amount of supplementation, forage availability, and grazing intensity have been related to voluntary forage intake. La variación en el consumo voluntario de forraje es indudablemente el principal factor dietario que determina el nivel y eficiencia de producción en un rumiante. Esta variación es mayor y muy difícil de predecir bajo condiciones de pastoreo. La productividad y eficiencia de rumiantes en pastoreo es relativamente baja debido, en parte, a las limitaciones en el consumo; la productividad probablemente se podrá incrementar si se incrementa el consumo. La distensión de la pared del rumenretículo es el principal mecanismo de regulación del consumo de forrajes de baja calidad en rumiantes en pastoreo, aunque la digestibilidad y la tasa de pasaje también afectan el consumo voluntario. Igualmente, el consumo se ve afectado por el tamaño corporal y peso metabólico del animal, por la cantidad y tipo de suplemento ofrecido, por la disponibilidad de forraje y por la intensidad del pastoreo.

  18. Determination of selenium and zinc in rat plasma by instrumental neutron activation analysis; Determinacion de selenio y zinc en plasma mediante analisis por activacion neutronica instrumental

    Energy Technology Data Exchange (ETDEWEB)

    Munoz A, Luis

    1998-12-31

    To evaluate the effects on the thyroid function when simple or multiple zinc, selenium and iodine deficiency are induced, research was carried out in laboratory animals. For simultaneously determining the Zn and Se concentration in rat plasma, an instrumental neutron activation analysis technique was applied. A clean laboratory, was used for the preparation of samples. High purity materials were used for sample collection and storage. Irradiation, decay and counting parameters were optimized to obtain the best sensitivity, accuracy and precision analysis. The Zn and Se concentrations were determined from the peak area of gamma-rays of 1115 and 265 KeV respectively. The analytical methodology used was validated with standard reference materials. The procedure used for the analysis, including the phases of collection, treatment of the samples and analytical determination was considered suitable for the study of trace elements in biological samples, especially plasma. (author). Dissertation to obtain the title of Bachelor in Chemistry; 46 refs., 12 figs., 17 tabs. [Espanol] Con el proposito de evaluar los efectos que se producen sobre la funcion tiroidea cuando se induce un deficiencia simple o multiple de zinc, selenio y yodo, se llevo a cabo una investigacion en animales de experimentacion. Se aplico la tecnica de analises por activacion neutronica instrumental para la determinacion de Se y Zn en plasma de ratas. Se utilizo un laboratorio limpio clase 100 para la preparacion de las muestras y se emplearon materiales de alta pureza para su recoleccion y almacenamiento. Se optimizaron los parametros de irradiacion, decaimiento y conteo de las muestras con el proposito de alcanzar la mejor sensibilidad, exactitud y precision analitica. Las concentracion de Se y Zn fueron determinadas evaluando las areas de los fotopicos de 265 y 1115 KeV respectivamente. El metodo analitico fue validado utilizando materiales de referencia. El procedimiento utilizado para el analisis

  19. Intoxicación ocupacional por mercurio

    Directory of Open Access Journals (Sweden)

    Augusto V Ramírez

    2008-03-01

    Full Text Available El mercurio, metal pesado ampliamente utilizado por el hombre, es muy tóxico; produce daño al sistema nervioso central, perturbaciones del comportamiento y lesiones renales. Se acumula en todos los seres vivos y no es esencial para ningún proceso biológico. La toxicidad del mercurio está directamente relacionada con su estado químico. El metilmercurio es la forma más dañina, con efectos neurotóxicos en adultos y en fetos de madres expuestas. El mercurio metálico no es menos tóxico. Las sales de mercurio inorgánico afectan directamente al riñón. Clínicamente, en la exposición ocupacional a mercurio se encuentra la triada clásica: temblor, alteración de la personalidad y estomatitis. En los últimos años se ha demostrado también alteración en la visión cromática. La exposición aguda se evalúa midiendo el mercurio en la sangre, mientras que la exposición crónica y ocupacional se determina mejor dosándolo en orina homogenizada de 24 horas. Los quelantes del metal -BAL, sus derivados o la D-penicilamina- son usados para tratar la intoxicación aguda o crónica.

  20. Histeria ainda hoje, por quê?

    Directory of Open Access Journals (Sweden)

    Dayse Santos Costa

    2016-04-01

    Full Text Available Resumo Estudo teórico que teve o propósito de discutir a histeria na contemporaneidade, considerando as mudanças culturais que podem ter acorrido desde a fundação da psicanálise até hoje. A discussão teve como cerne os apontamentos de Charles Melman, posto que seja um psicanalista que vem pensando a posição do sujeito nas condições da cultura ocidental atual. Foram destacados aspectos que nos conduziram a elaborar um pensamento em torno de como a neurose histérica aparece no contexto contemporâneo. Partimos do princípio de que sofremos uma mutação cultural, na qual passamos de uma cultura propensa à neurose para uma propensa à perversão. Tal concepção determina que lidamos com sujeitos que funcionam sob a ordem de uma nova economia psíquica e que em decorrência assistimos a expressão de uma histeria coletiva que, por sua vez, seria espaço de reivindicação dos sujeitos, a fim de requisitar um paradeiro e reinventar um pai que já esteja destituído.

  1. Identidad e interculturalidad: un horizonte por visitar

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    Marian Pérez Bernal

    2016-01-01

    Full Text Available En el presente trabajo mantenemos que el concepto de identidad defendido por Amin Maalouf puede ser una interesante vía para conseguir una aproximación entre las distintas culturas capaz de conducirnos a un diálogo fructífero que nos permitan gestionar la multiculturalidad actual. Defendemos que las culturas sean vistas como escenas de debate y contestación en constante proceso de construcción y reconstrucción y en las que siempre primen unos valores que nos conciernen a todos y que han de ser irrenunciables.In this paper, it is stated that the concept of identity defended by Amin Maalouf could be an interesting way to achieve a rapprochement amongst different cultures. This could lead to a fruitful dialog allowing to manage today’s multiculturalism. It is also defended that cultures should be considered as instruments of debate and reply on a continuous process of construction and reconstruction. However, cultures should not prevail over a series of values that concern to all of us and that should be inalienable.

  2. Libertad, igualdad, sostenibilidad. Por un ecofeminismo ilustrado

    Directory of Open Access Journals (Sweden)

    Puleo, Alicia H.

    2008-06-01

    Full Text Available This article presents the proposal of an enlightened Ecofeminism and defines it as an ethic-political thinking about human relations to Nature. It aims at ecojustice and sustainability, which are characterized through the criticism of prejudice, through the principles of equality and autonomy, and through the nominalist conceptualization of gender, intercultural dialogue and the sensible acceptance of science and technique. The enlightened Ecofeminism universalizes virtues such as caring for the human and non-human Nature, and defends a compassionate moral towards the radical finitude of the world.

    En este artículo se presenta la propuesta de un ecofeminismo ilustrado entendido como reflexión ético-política sobre las relaciones de los humanos con la Naturaleza. Orientado a la ecojusticia y la sostenibilidad, el ecofeminismo ilustrado se caracterizaría por la crítica al prejuicio, la defensa de los principios de igualdad y autonomía, la conceptualización nominalista del género, el diálogo intercultural, la aceptación prudente de la ciencia y la técnica, la universalización de las virtudes del cuidado aplicadas a los humanos y al resto de la Naturaleza, y una moral de la compasión frente a la radical finitud del mundo.

  3. Estudio electrofisiologico en la neuropatia por Vincristina

    Directory of Open Access Journals (Sweden)

    Olga P. Sanz

    1975-12-01

    Full Text Available Diez pacientes afectados por diversas patologías que requerían tratamiento crónico con Vincristina, fueron sometidos a estudios electrofisiológicos en los que se valoró: el número de unidades motoras (UM funcionantes en los músculos de la eminencia tenar, los valores de los incrementos medios de UM, velocidad de conducción motora y su latencia residual en el nervio mediano, la velocidad de conducción sensitiva del mismo nervio y el estado de la transmisión neuromuscular. Los valores obtenidos fueron comparados con grupos controles. Los resultados mostraron disminución del número de UM; las UM remanentes presentaron amplitud reducida junto a otras cuyo tamaño no superaba el del grupo control, hecho que sugiere la incapacidad de lograr una reinervación adecuada. Las velocidades de conducción motora y sensitiva mostraron valores diminuídos, con mayor compromiso en los segmentos distales. Junto a estos datos se halló respuesta miasteniforme al estímulo repetitivo. Todos estos resultados permiten postular la existencia de un compromiso de la unidad motora, abarcando todos sus segmentos, en pacientes intoxicados con Vincristina.

  4. Validation of the methodology for the quantitative determination of lead in cosmetics dyes available in the national market by atomic absorption spectroscopy with flame; Validacion de la metodologia para la determinacion cuantitativa de plomo en tintes cosmeticos disponibles en el mercado nacional por espectroscopia de absorcion atomica con llama

    Energy Technology Data Exchange (ETDEWEB)

    Silva Trejos, Paulina [Univ. de Costa Rica, Escuela de Quimica, telefono 2511-4870, fax 2253-5020 (Costa Rica)], E-mail: stpaulinita@gmail.com

    2008-07-15

    The analytical methodology was validated to quantify lead in cosmetics dyes available on the national market, by the method of atomic absorption spectroscopy with flame. The samples were digested by wet digestion with HNO{sub 3} to 65% m/m in a microwave oven, the percentage of recovery for the digestion of samples of 0,25 g and 0,45 g in 5,00 mL was of 100,5{+-}0,5. The field of optimal linearity detection limit was 5,0 mg/L with a correlation coefficient of 0,9998. The limits of detection and quantification limits determined graphically by the method of row errors for linear regression of 0,12{+-}0,02 mg/L and 0,21{+-}0,02 mg/L, respectively. Precision was evaluated determining the repeatability as standard deviation of five replicas of a positive dye for lead, according to the definition of the ISO, 2{radical}2*, and obtained a value of 2,3. The veracity was determined through percentages of recovery assessed, adding aliquots of lead patterns to dye samples and compared with the same mass to which they are not make additions. The dye samples were obtained at point of sale, such as pharmacies, beauty suppliers, supermarkets, sales of natural products and the central market of San Jose. The dyes tested contain lead acetates active ingredient, these are: Doni, Mont D'Or, Matador y Siempre Joven; they are produced locally, Youthair brand and American manufacturing. (author) [Spanish] La metodologia analitica fue validada para determinar cuantitativamente el plomo en tintes cosmeticos disponibles en el mercado nacional, por el metodo de espectroscopia de absorcion atomica con llama. Las muestras se dirigieron por digestion humeda con HNO{sub 3} al 65% m/m en horno de microondas; el porcentaje de recuperacion para la digestion de muestras de 0,25 g y 0,45 g en 5,00 mL fue de 100,5{+-}0,5. El ambito de linialidad optimo fue del limite de deteccion de 5,0 mg/L con un coeficiente de correlacion de 0,9998. Los limites de deteccion y los limites de cuantificacion

  5. A Quick Method of Measuring and Analyzing {beta} Emitters in Solution of Very Low-Level Specific Activity; Remarques sur une technique rapide de mesure et d'analyse d'emetteurs {beta} en solution de tres faible activite specifique; Zamechaniya o bystroj tekhnike izmereniya i analize izluchatelej {beta}-chastits v rastvore s ochen' slaboj spetsificheskoj aktivnost'yu; Observaciones sobre un metodo rapido de medicion y analisis de emisores {beta} en soluciones de muy baja actividad especifica

    Energy Technology Data Exchange (ETDEWEB)

    Le Gallic, Y; Grinberg, B; Thenard, M [Centre d' Etudes Nucleaires de Saclay (France)

    1960-06-15

    vaina de contadores conectados en anticoincidencia con los primeros. 2. Ademas enumeran las posibilidades y campos de utilizacion del metodo que: a) especialmente en el caso de los emisores {beta} blandos, permite medir actividades especificas mucho mas bajas que cuando se utilizan contadores para liquidos; b) permite descubrir las sustancias radiactivas presentes como impurezas en determinados radioelementos (por ejemplo, 2/10 000 de P{sup 32} en S{sup 35}); c) para la mayor parte de los radioelementos permite medir, sin necesidad de proceder a una concentracion previa, actividades especificas de igual orden de magnitud que los limites de tolerancia actualmente admitidos. (author) [Russian] 1. Opisanie mekhanizma izmereniya so slabym fonom prednaznachennog o dlya izmereniya radioaktivnykh produktov v zhidkom sostoyanii, kotoryj sostoit v osnovnom iz dvukh ploskikh schetchikov s odnim oknom i odnogo ploskogo schetchika s dvumya oknami, raspolozhenny kh parallel'no drug k DRUGU i izolirovanny kh vnutri zashchitnoj obolochkoj schetchikov, vstavlen- nykh takim obrazom, chtoby oni ne sovpadali s pervymi. 2. Vozmozhnosti i oblasti ispol'zovaniya metoda: a) ehtot metod pozvolyaet izmerit' gorazdo bolee slabuyu spetsificheskuyu aktivnost', chem ehto vozmozhno s zhidkotnymi schetchikami, v chastnosti s izluchatelyami ne zhestkikh {beta}-chastits; b) ehtot metod pozvolyaet obnaruzhivat' radioaktivnye primesi vnutri radioehlementa (napr. 2/10 OOO R{sup 32} v S{sup 35}); s) ehtot metod pozvolyaet dlya bol'shinstva radioehlemento v izmeryat' bez predvaritel'no j kontsentratsii spetsificheskuyu aktivnost' sootvetstvenno ravnuyu prinyatym v nastoyashchee v nastoyashchee vremya predel'nym dopuskam. (author)

  6. Itinerarios Didácticos por la isla de Lanzarote

    OpenAIRE

    Becerra-Ramírez, Rafael; González Cárdenas, Elena; Gosálvez, Rafael U.; Escobar Lahoz, Estela; Dóniz-Páez, Javier

    2013-01-01

    Con la confección de esta guía de itinerarios didácticos por la isla de Lanzarote pretendemos contribuir a un mayor conocimiento de las características geográficas de este espacio dominado por las formas volcánicas que caracterizan un paisaje modificado por la mano del hombre que convive con los volcanes y los usa, tradicionalmente como soporte de sus cultivos, y modernamente como base de la industria turística. Los itinerarios didácticos por la isla de Lanzarote son la adaptación de los t...

  7. Scattering of Neutrons by Liquid Bromine; Diffusion des neutrons par le brome liquide; R; Dispersion de neutrones por bromo liquido

    Energy Technology Data Exchange (ETDEWEB)

    Coote, G E; Haywood, B C [Atomic Energy of Canada Ltd., Chalk River, Ontario (Canada)

    1963-01-15

    energetica de los neutrones dispersos fue medida para angulos comprendidos entre 10{sup o} y 160{sup o}, mediante el metodo del tiempo de vuelo. La distribucion angular cbnfirma los resultados obtenidos en un estudio anterior por Caglioti. Los espectros fueron expresados en la forma correspondiente a la ''ley de dispersion'' S({alpha},{beta}) de Egelstaff y analizados para derivar la distribucion generalizada de frecuencias p({beta}) de los movimientos atomicos en el liquido. La funcion p({beta}) tiene un pico poco pronunciado, cuyo maximo corresponde a {beta}{approx}0,3 y no parece presentar saltos en el intervalo 0 < {beta} < 0,8 medido; la forma general de la curva confirma la descripcion del liquido como ''cuasi-cristalino''. Los autores examinan las dificultades que presenta la normalizacion absoluta de la funcion p({beta}). (author)

  8. Investigation of multi-phases dynamic systems by means of optical and electrochemical methods; Investigacion de sistemas dinamicos multifasicos mediante metodos opticos y electroquimicos

    Energy Technology Data Exchange (ETDEWEB)

    Sarmiento Martinez, Oscar

    2008-09-15

    de la degradacion metalica en muestras de aluminio durante los estados iniciales de procesos de oxidacion en soluciones acuosas, sin medir contacto fisico alguno. Adicionalmente, se desarrollo un modelo matematico el cual permite, a partir de los desplazamientos ortogonales que ocurren en la superficie del metal durante la reaccion anodica, encontrar la perdida o crecimiento del espesor de la capa metalica de la muestra a partir del conteo de franjas de interferencia. En la presente tesis doctoral, se presentan resultados experimentales y numericos referentes a ciertos procesos de corrosion en diferentes sistemas electroquimicos utilizando simultaneamente el monitoreo optico mediante interferometria de Michelson y el monitoreo electroquimico mediante curvas de polarizacion. Se analiza la informacion tanto cualitativa como cuantitativa de importantes parametros fisicos relacionados con los procesos de corrosion y su dinamica, asi como la formacion de patrones de interferencia cuyo contraste optico se pierde con el paso de tiempo, para subitamente reaparecer y con ello nuevamente la aparicion del patron de interferencia inicial. Por otro lado, se desarrollo un modelo matematico a partir del sistema optico-electroquimico, el cual permite cuantificar mediante parametros opticos la perdida de material o crecimiento de oxido en metales, permitiendo reproducir las curvas electroquimicas mediante el conteo de maximos de interferencia. Finalmente, y de acuerdo a conceptos de la teoria de sistemas dinamicos no lineales, se analizan y discuten los parametros fisicos dinamicos no lineales relativos a la existencia de soluciones complejas de tipo caotico con base en los datos obtenidos de los procesos de corrosion en soluciones acuosas e hidrocarburos observados durante el monitoreo optico-electroquimico de nuestro sistema.

  9. Úlceras por presión causadas por dispositivos clínicos

    OpenAIRE

    Iglesias Ruisánchez, Sandra

    2017-01-01

    Las úlceras por presión (UPP) son lesiones comunes en los pacientes hospitalizados, especialmente en las unidades de cuidados intensivos (UCI). Los enfermos críticos tienen un riesgo elevado de desarrollar UPP, debido principalmente a la limitación de la movilidad, disminuyendo su capacidad para cambiar activamente su posición en la cama o asiento. Además, el efecto de fármacos anestésicos y sedantes, puede causar una pérdida de la percepción sensorial cutánea. Los diferentes dispositivos clí...

  10. Thermal Shock Tests on UO{sub 2} Small Spheres; Essais de choc thermique sur des elements spheriques de UO{sub 2}; Ispytaniya nebol'shikh sharikov iz UO{sub 2} teplovykh udarom; Ensayo de pequenas esferas de UO{sub 2} por choque.termico

    Energy Technology Data Exchange (ETDEWEB)

    Perona, G.; Brutto, E.; Galbusera, U.; Palladino, G.; Sesini, R. [Centro Informazioni Studi Esperienze, Milan (Italy)

    1963-11-15

    elements a des contraintes analogues a celles qu'ils subissent dans la pile. Les auteurs exposent un procede dans lequel les elements spheriques sont soumis a un choc thermique et ils indiquent la maniere dont on parvient a simuler des contraintes directement comparables a celles qui existent dans le reacteur. Comme il s'agit de spheres de petite dimension, la difficulte consiste a produire des refroidisseurs dont le coefficient de transmission superficielle est tres eleve. Les auteurs exposent les methodes experimentales utilisees et les resultats obtenus. Le procede decrit par les auteurs presente un interet particulier dans le domaine de la recherche technologique, car il permet d'ameliorer les caracteristiques des spheres de l'UO{sub 2} au moyen de produits d'addition. En fait, il permet de controler par une seule operation de mesure l'effet global auquel on s'interesse. (author) [Spanish] Si en un reactor-se utilizan como combustible pequenas esferas de UO{sub 2} en contacto con el refrigerante, es preciso conocer el valor maximo de la tension termica que. debido a las condiciones de trabajo en el reactor, las pequenas esferas son capaces de soportar sin romperse. Estas condiciones pueden evaluarse si se conocen las propiedades fisicas del material. Pero en razon del considerable numero de propiedades que intervienen, y habida cuenta de la incertidumbre que siempre existe respecto de cada una de ellas, es preferible ensayar directamente las esferas sometiendolas a tensiones analogas a las que estan expuestas en el reactor. En la memoria se estudia un metodo de ensayo de dichas esferas por choque termico y se indican las condiciones en que tal metodo permite reproducir tensiones termicas directamente comparables con las reinantes en el reactor. En cuanto a las pequenas esferas, la dificultad estriba en lograr condiciones de refrigeracion en las que el coeficiente de transmision superficial de calor sea muy elevado. Se describen los metodos experimentales aplicados y se

  11. Mujeres por la utilidad de la virtud

    Directory of Open Access Journals (Sweden)

    Nancy Rodríguez Pupo

    2014-08-01

    Full Text Available La mujer cubana ostenta una vasta tradición combativa y es ejemplo de entereza, abnegación, sacrificio y compromiso social. Quien se acerque a la historia de nuestro proceso nacional-liberador a todo lo largo de su devenir, constatará su presencia como forjadoras de la nación. Integrante fundamental de la sociedad, la mujer hizo suyas las ansias libertadoras y desempeñó un rol importante en aras de crear una patria común. Se trata de entender que en lo más mínimo su papel fue de “retaguardia”, sino todo lo contrario, su trabajo fue necesario y en no pocas ocasiones empuñó las armas y con valentía gritó ¡viva Cuba libre!, incluso a cambio de su vida, como lo protagonizó la tunera Mercedes Varona. El ejemplo de la mujer cubana y particularmente tunera, es imperecedero en su doble función de ser social y generadora de nuevas vidas, con amplias posibilidades de realización personal y profesional luego de 1959. Su actuación se manifiesta en cada actividad del sector de la salud pública como médica, enfermera, técnica, profesora y estomatóloga, así como también en otros puestos de trabajo no menos necesarios. Ellas con altruismo, solidaridad, responsabilidad y humanismo, son continuadoras de las mejores tradiciones científicas, patrióticas y revolucionarias de nuestro pueblo. Esta edición se dedica al 8 de marzo, día internacional de la mujer, las homenajeamos y recordamos la obra de Laura Martínez Carvajal, primera médica cubana, quien desafió los prejuicios de su época o Isabel Rubio que puso sus conocimientos de medicina farmacéutica al servicio del Ejército Libertador, en el que alcanzó los grados de capitana de sanidad; por citar dos entre las grandes. Otras féminas de la localidad ejercieron en la manigua sus dotes de parteras o enfermeras, tal el caso de Anita Cruz, magnífica artillera, quien estuvo al frente de un hospital de campaña durante la guerra. Allí curó heridas, infecciones, disenter

  12. Impacto do manejo da água na toxidez por ferro no arroz irrigado por alagamento

    Directory of Open Access Journals (Sweden)

    Fabiana Schmidt

    2013-10-01

    Full Text Available A toxidez por ferro é o distúrbio nutricional de maior ocorrência em arroz (Oryza sativa L. cultivado em sistemas alagados, derivada da quantidade excessiva de íons ferrosos (Fe2+ gerados pela redução de óxidos de ferro em solos alagados. Em experimento conduzido em casa de vegetação, foram avaliados os efeitos de manejos da água de irrigação na dinâmica de redução de um Planossolo e na manifestação da toxidez por ferro em arroz. Os tratamentos dispostos em blocos completos ao acaso com quatro repetições constaram de cinco manejos da água: T1- início do alagamento no estádio V2-V3 do arroz; T2- início do alagamento no estádio V6-V7; T3- T1 e drenagem no estádio V10-V11; T4- T2 e drenagem no estádio V10-V11; e T5- T1 e drenagens nos estádios V7-V8 e V10-V11. O atraso do início do alagamento para o estádio V6-V7 do arroz manteve os valores do Eh da solução do solo mais elevados, promovendo menor disponibilidade de Fe2+ na solução do solo e deslocando a máxima liberação de Fe2+ na solução do solo para estádios fenológicos mais avançados do arroz. A realização de drenagens ao longo do ciclo vegetativo do arroz promoveu a reoxidação do solo, que ocasionou o aumento dos valores de Eh e redução da concentração de Fe2+ na solução do solo. O uso de drenagens durante o período vegetativo do arroz foi eficiente no controle da toxidez por excesso de ferro, em arroz cultivado em solo alagado.

  13. Verificación de la contaminación del maíz por flatoxina B1

    Directory of Open Access Journals (Sweden)

    Lisa Vallone

    2010-10-01

    Full Text Available “Aflaflesh” es un instrumento computarizado, diseñado para combinar un metodo de adquisición de datos visuales, con sofisticados sistemas operativosde software y análisis de imágenes. Esto, mediante la exposicion de la fluorescencia de maíz sometido a la radiación UV, ya que si hay contaminación con aflatoxinas B1, es posible transformar directamente el número de pixeles de la fluorescencia, en la concentración de AFB1 correspondiente.

  14. Ansiedad percibida por los pacientes hospitalizados por quemaduras, en una Unidad de Quemados

    Directory of Open Access Journals (Sweden)

    M. Alcázar-Gabás

    2014-06-01

    Full Text Available El presente trabajo, pretende describir el estado de ansiedad que experimentan los pacientes ingresados en una Unidad de Quemados. Uno de los factores clave en los cuidados del paciente quemado es una buena atención psicológica. La realidad demuestra que es el profesional de enfermería quien observa los síntomas emocionales durante los primeros días de ingreso y trata de responder a esa demanda de cuidado. Pretendemos, a través de la medición del nivel de ansiedad que perciben los pacientes ingresados en la Unidad de Quemados elegida para nuestro estudio durante el primer semestre del año 2009, identificar a aquellos que estén en riesgo de padecer mayores niveles de ansiedad durante su hospitalización, para así poder establecer un plan de cuidados adaptado a las necesidades emocionales de cada uno. Los resultados obtenidos nos permiten concluir que los pacientes quemados ingresados en la Unidad de Quemados presentaron niveles elevados de ansiedad que son superiores entre la población femenina, así como en aquellos pacientes con lesiones de mayor extensión. Determinamos también que los pacientes ingresados por quemaduras en la Unidad de Quemados a estudio fueron mayoritariamente varones, de nacionalidad española, residentes en medio urbano con una media de edad de 50 años, siendo las quemaduras producidas por llama en accidentes domésticos la causa más frecuente.

  15. Escenarios de costos generados por el uso del costeo variable

    OpenAIRE

    Zea Lourido, Felipe

    2013-01-01

    Este trabajo demuestra cómo el costeo absorbente, considerado por expertos en la materia, uno de los métodos de costeo usado frecuentemente por las organizaciones, con el propósito de determinar el valor de los inventarios y del costo de productos vendidos que intervienen en el estado de resultados para usuarios externos (stakeholders), al compararlo con el costeo variable, preferido por algunos administradores para toma de decisiones internas y usado en la preparación del estado de resultado...

  16. Itinerarios didácticos por la isla de Tenerife

    OpenAIRE

    Becerra Ramírez, María Carmen; Javier Dóniz-Páez; González Cárdenas, Elena; Gosálvez, Rafael U.; Becerra-Ramírez, Rafael; Escobar Lahoz, Estela

    2013-01-01

    Con la elaboración de esta guía de Itinerarios Didácticos por la isla de Tenerife pretendemos contribuir a un mayor conocimiento de las características geográficas de un espacio dominado por las formas y formaciones volcánicas que caracterizan un paisaje fuertemente modificado por la actividad humana. El hombre convive y usa lo que los volcanes le ofrecen, tradicionalmente como soporte de sus cultivos o de su actividad ganadera,y modernamente como base de la industria turística. Los itiner...

  17. Topoplastia de Cvintal assistida por laser de femtossegundo

    Directory of Open Access Journals (Sweden)

    Alexandre Takayoshi Ishizaki

    2013-06-01

    Full Text Available Apresentamos um relato de astigmatismo tardio progressivo pós-transplante de córnea para ceratocone, associado à afinamento periférico na junção doador-receptor, o que presumidamente pode ser considerado como recorrência da ectasia. O caso foi tratado por meio de Topoplastia de Cvintal assistida por laser de femtossegundo para a confecção da incisão com geometria "top hat", seguido de sutura com ajuste per-operatório guiado por ceratoscopia.

  18. Selección de Recursos Humanos por Competencias

    OpenAIRE

    Sánchez Domingo, Cristina

    2013-01-01

    Los objetivos de este trabajo son, por un lado conocer en qué consisten los procesos de valoración y selección de personas desde el enfoque de las competencias laborales. Para ello, ha sido preciso profundizar en el estudio del concepto de “competencia laboral”, y comprender qué es la Gestión de Recursos Humanos por Competencias, en cuyo seno se encuentra la propia Selección de Recursos Humanos. Por otra parte, un segundo objetivo del trabajo es conocer el grado de implantación de la Selecció...

  19. Orlando Castellanos. La pasión por la radio

    OpenAIRE

    Castellanos Molina, Orlando, 1930-1998

    2004-01-01

    Documento sonoro en el que se recogen entrevistas realizadas a Orlando Castellanos por Miguel Ángel de la Guardia, Miladys Ochoa, Fernando Rodríguez Sánchez (Ciego de Ávila), Ángel Ferrera, Boshmonar, Jaime Almiral, Radio Umbral de Santiago de Chile, Franco Carbón, Luis Toledo Sande y Estrella Díaz. Esta grabación pertenece a la colección Palabra Viva, desarrollada por el Centro Cultural Pablo de la Torriente Brau, a partir de las entrevistas realizadas por el periodista Orlando Castellanos. ...

  20. The Role of Non-Destructive Testing in Test-Reactor Operation at the National Reactor Testing Station; Role des Essais Non Destructifs dans l'Exploitation des Reacteurs d'Essai au Centre National d'Essais de Reacteurs; Rol' nedestruktivnykh ispytanij pri ehkspluatatsii ispytatel'nykh reaktorov na natsional'noj stantsii po ispytaniyam reaktorov; Papel de los Metodos No Destructivos en la Explotacion de los Reactores de la National Reactor Testing Station

    Energy Technology Data Exchange (ETDEWEB)

    Francis, W. C.; Brown, E. S.; Burdick, E. E.; Gibson, G. W.; Tingey, F. H. [Phillips Petroleum Company, Atomic Energy Division, Idaho Falls, Idaho (United States)

    1965-10-15

    'un densimetre, permettent de determiner la distribution du combustible. On a habituellement recours a la radiographie des soudures pour les parties constitutives des reacteurs et des boucles d'essai. Le dispositif perfectionne de mesure de la reactivite (Advanced Reactivity Measurement Facility, ARMF) permet de determiner, pour chaque cycle de reacteur, l'irradiation du combustible et l'empoisonnement dans des specimens. Une application assez peu courante pour un assemblage critique est la mesure de la teneur en bore du combustible dans l'assemblage critique d'essai en genie des reacteurs (Engineering Test Reactor Critical Facility, ETRC). Le controle par courants de Foucault et par des procedes mecaniques de l'espacement des plaques de combustible et la mesure par courants de Foucault de l'epaisseur de l'oxydation (corrosion) sur les plaques irradiees ont donne d'excellents resultats. Des methodes complementaires qui ont fait leurs preuves sont l'inspection par liquide penetrant et les essais a l'azote liquide pour les craquelures superficielles, les essais par recuit thermique pour les souitlures et l'exploration par rayons gamma des plaques irradiees. On a recours a l'essai hydraulique d'un echantillon statistique d'elements combustibles pour verifier l'integrite structurale, notamment la resistance de la liaison entre les plaques de combustible et la gaine. Des efforts constants sont deployes pour ameliorer les methodes actuelles et mettre au point de nouveaux procedes de controle non destructif. (author) [Spanish] Los reactores de ensayo de la National Reactor Testing Station suponen una enorme inversion (superior a 100 millones de dolares) y la necesidad de explotarlos en condiciones de seguridad obliga a proceder a un control de calidad muy estricto de los componentes nucleares y de ensayo, especialmente en lo que respecta a los elementos combustibles y de control. Por tanto, los metodos no. destructivos son fundamentales para determinar la calidad de estos componentes

  1. Inventory Methods in a Conversion Plant; Methodes d'Inventaire dans un Etablissement de Transformation; Metody inventarizatsij na predpriyatii po pererabotke yadernykh materialov; Metodos de Inventario en una Planta de Transformacion

    Energy Technology Data Exchange (ETDEWEB)

    Billy, G. [Commissariat a l' Energie Atomique, Paris (France)

    1966-02-15

    inventarios es la de salvaguardar los intereses de la Comision, evaluar la cuantia de las perdidas y controlar las medidas adoptadas para el almacenaje de los desechos. Para el recuento de las existencias el inspector puede efectuar materialmente el inventario, participar en el o comprobarlo. Este ultimo procedimiento es el que da mejores resultados. Las operaciones de recuento, precedidas de una reunion preparatoria para fijar las modalidades, se efectuan en dos tiempos: la comprobacion del inventario ponderal y la comprobacion de la contabilidad fisica. Las cuestiones que pueden plantearse durante el inventario se refieren a las discrepancias en el peso y el contenido, la eleccion del equipo de pesada, los residuos y la evaluacion de las perdidas. Los metodos de inventario no deben diferir de un pais a otro. Parece preferible subrayar las dificultades que se presentan durante las operaciones y estudiar en comun los medios para evitarlas. (author) [Russian] Osnovnymi zadachami inventarizacii javljajutsja: sobljudenie interesov Komissariata; opredelenie razmerov poter'; kontrol' mer, prinimaemyh dlja hranenija othodov. Inspektirujushhee lico mozhet provodit' fakticheskuju inventarizaciju, uchastvovat' v nej ili proverjat' ee. Jetot poslednij metod daet nailuchshie rezul'taty. Operacii po uchetu, kotorym predshestvuet podgotovitel'noe soveshhanie dlja opredelenija sposobov ucheta, provodjatsjav dva jetapa: snachala proverjaetsja nalichie po vesu, azatemdoku mentacija. Voprosy, voznikajushhie v svjazi s inventarizaciej i kasajushhiesja vesa, soderzhanija poko- vok, vybora vesov dlja vzveshivanija, normy othodov i ocenki poter', razreshajutsja otpravite- lem i poluchatelem. Metody inventarizacii v odnom gosudarstve ne dolzhny sil'no otlichat'sja ot takovyh v drugom gosudarstve. Neobhodimo podcherknut' trudnosti, voznikajushhie v processe inven- tarizacii, i zhelatel'nost' otyskanija sovmestnyh putej ih preodolenija. (author)

  2. Elasticidad precio de la demanda por autopistas interurbanas en Chile

    Directory of Open Access Journals (Sweden)

    Rodrigo Sanes

    2013-01-01

    transporte depende de la información que se disponga respecto a la elasticidad precio de la demanda por el uso de puentes, túneles y carreteras. El objetivo de este trabajo es estimar la elasticidad precio de la demanda por el uso de autopistas interurbanas en Chile utilizando el método de regresiones aparentemente no relacionadas (SUR y un panel de 48 datos mensuales obtenidos a partir de 21 plazas de peajes (48 x 21. Nuestros resultados muestran que, aún controlando por el precio de la gasolina y el nivel de actividad económica, la demanda por el uso de carreteras resulta ser muy inelástica al precio del peaje, con valores que oscilan entre -0,17 para automóviles y -0,05 para camiones.

  3. Elasticidad precio de la demanda por autopistas interurbanas en Chile

    Directory of Open Access Journals (Sweden)

    Rodrigo Saens

    2013-07-01

    Full Text Available La efectividad de un esquema de tarificación vial para optimizar el uso de infraestructura de transporte depende de la información que se disponga respecto a la elasticidad precio de la demanda por el uso de puentes, túneles y carreteras. El objetivo de este trabajo es estimar la elasticidad precio de la demanda por el uso de autopistas interurbanas en Chile utilizando el método de regresiones aparentemente no relacionadas (SUR y un panel de 48 datos mensuales obtenidos a partir de 21 plazas de peajes (48 x 21. Nuestros resultados muestran que, aún controlando por el precio de la gasolina y el nivel de actividad económica, la demanda por el uso de carreteras resulta ser muy inelástica al precio del peaje, con valores que oscilan entre -0,17 para automóviles y -0,05 para camiones.

  4. Osteoporosis secundaria y Osteoporosis inducida por glucocorticoides (OIG

    Directory of Open Access Journals (Sweden)

    Elías Forero Illera

    2006-01-01

    Full Text Available La osteoporosis es un problema de salud pública importante a nivel mundial, y su prevalencia está aumentando. La osteoporosis secundaria se puede producir por varias patologías y el uso de ciertos medicamentos. Los glucocorticoides son un grupo de fármacos usados extensamente en la práctica médica debido a su indiscutible utilidad. La osteoporosis inducida por glucocorticoides es un problema de salud pública. Aunque la patogénesis de la pérdida producida por los glucocorticoides en el hueso no se conoce totalmente, investigaciones recientes han proporcionado nuevas conocimientos en los mecanismos de estos fármacos a nivel celular y molecular. Diversas guías han sido propuestas por diversos grupos para el tratamiento de la OIG; desafortunadamente, las guías del tratamiento no se utilizan adecuadamente en los pacientes.

  5. Higiene mental: conferencia dictada por la Radiodifusora Nacional

    Directory of Open Access Journals (Sweden)

    Francisco Gómez Pinzón

    1941-01-01

    tiene extraordinaria trascendencia para el país por sus vastas repercusiones sobre el futuro de nuestro pueblo, y que, sin embargo ha sido negligentemente olvidado por las autoridades y deliberadamente ignorado por los sectores cultos e ilustrados de nuestra sociedad. Me refería entonces a la curva ascendente que, no sólo entre nosotros sino en todos los países civilizados, han seguido en su propagación las enfermedades nerviosas y mentales, y que hace contraste con la disminución progresiva de las demás afecciones y en especial de las infecto-contagiosas, que están a punto de ser dominadas por la técnica cada día más perfecta de la medicina preventiva. Hoy quiero ocuparme de algunos aspectos de este mismo tema que apenas alcanzaron a ser esbozados en mi conferencia anterior.

  6. San Sebastian, vista por Paret y Alcázar

    Directory of Open Access Journals (Sweden)

    María Castilla Albisu

    2013-07-01

    Full Text Available Luis Paret y Alcázar pintó una serie de vistas panorámicas de puertos del litoral Cantábrico, por encargo del rey Carlos III. El objetivo de este trabajo es ahondar en la vida de este pintor para así comprender mejor su obra. A pesar de los estudios realizados por algunos historiadores quedan todavía incógnitas por descubrir relativas a la vida y al trabajo de este artista. Al acercarse a la figura de Paret y Alcázar hay que preguntarse por qué habiendo sido uno de los pintores más prometedores de su tiempo, su figura ha caído en un triste olvido.

  7. Polución por material particulado fino (PM 2,5) incrementa las hospitalizaciones por insuficiencia cardiaca

    OpenAIRE

    Castro, Pablo; Vera, Jeanette; Cifuentes, Luis; Wellenius, Gregory; Verdejo, Hugo; Sepúlveda, Luis; Vukasovic, José Luis; Llevaneras, Silvana

    2010-01-01

    Antecedentes: Estudios recientes han reportado una asociación entre la contaminación ambiental por material particulado (PM) y el riesgo de hospitalizaciones de pacientes con insuficiencia cardiaca (IC). La región metropolitana de nuestro país constituye un área geográfica en la cual la contaminación es especialmente relevante, asociándose a incrementos periódicos en la morbimortalidad por causa respiratoria. Sin embargo el efecto de la polución por PM en la morbilidad de pacientes con IC no ...

  8. CARACTERÍSTICAS DA VIOLÊNCIA SEXUAL SOFRIDA POR CRIANÇAS ASSISTIDAS POR UM PROGRAMA DE APOIO

    OpenAIRE

    KELLY LINHARES VASCONCELOS; ADRIANA GOMES NOGUEIRA FERREIRA; ELIANY NAZARÉ OLIVEIRA; DANIELLE D\\u2019ÁVILA SIQUEIRA; PATRÍCIA NEYVA DA COSTA PINHEIRO

    2010-01-01

    En Brasil, las estadísticas de la violencia sexual contra niños están lejos de reflejar la verdadera realidad actual debido a la baja notificación de los casos. La finalidad de este estudio fue caracterizar el abuso sexual sufrido por niños asistidos por el Programa Sentinela y el perfil del agresor, en Sobral-Ceará, en el periodo que va del 2002 al 2006. La muestra no probabilística intencional fue compuesta por 50 víctimas de abuso sexual y de las mismas, el 66% es del sexo femenino, con pr...

  9. Pronóstico de la diarrea por rotavirus

    Directory of Open Access Journals (Sweden)

    Mota-Hernández Felipe

    2001-01-01

    Full Text Available Objetivo. Comparar la gravedad de la diarrea por rotavirus (RV y por no rotavirus. Material y métodos. Estudio transversal en 520 lactantes con diarrea aguda, efectuado entre octubre de 1994 y marzo de 1995 en siete centros del primer nivel de atención en cinco estados de México. El diagnóstico de RV se realizó con ensayo inmunoenzimático o por electroforesis. El análisis se hizo a través de medidas de tendencia central. Los resultados se presentan como promedio y desviación estándar o mediana o variación. Resultados. Se aisló RV en 264 lactantes (50.7% con predominio en varones de 6 meses a un año. Las manifestaciones clínicas fueron significativamente diferentes entre el grupo rotavirus positivo y el grupo rotavirus negativo en mediana de evacuaciones por 24 horas, frecuencia de vómitos, temperatura > 38° C, deshidratación y calificación de gravedad, respectivamente. Conclusiones. Estos resultados mostraron peor pronóstico por mayor gravedad de la diarrea por RV en lactantes, con relación a otra etiología. El texto completo en inglés de este artículo está disponible en: http://www.insp.mx/salud/index.html

  10. The PorX response regulator of the Porphyromonas gingivalis PorXY two-component system does not directly regulate the Type IX secretion genes but binds the PorL subunit.

    Directory of Open Access Journals (Sweden)

    Maxence S Vincent

    2016-08-01

    Full Text Available The Type IX secretion system (T9SS is a versatile multi-protein complex restricted to bacteria of the Bacteriodetes phylum and responsible for the secretion of surface attachment of diverse proteins that participate to S-layer formation, gliding motility or pathogenesis. The T9SS is poorly characterized but a number of proteins involved in the assembly of the secretion apparatus in the oral pathogen Porphyromonas gingivalis have been identified based on genome substractive analyses. Among these proteins, PorY and PorX encode typical two-component system (TCS sensor and CheY-like response regulator respectively. Although the porX and porY genes do not localize at the same genetic locus, it has been proposed that PorXY form a bona fide TCS. Deletion of the porX in P. gingivalis causes a slight decrease of the expression of a number of other T9SS genes, including sov, porT, porP, porK, porL, porM, porN and porY. Here, we show that PorX and the soluble cytoplasmic domain of PorY interact. Using electrophoretic mobility shift, DNA-protein co-purification and heterologous host expression assays, we showed that PorX does not bind and does not directly regulate expression of the T9SS genes. Finally, we show that PorX interacts with the cytoplasmic domain of PorL, a component of the T9SS membrane core complex and propose that the CheY-like PorX protein might be involved in the dynamics of the T9SS.

  11. The PorX Response Regulator of the Porphyromonas gingivalis PorXY Two-Component System Does Not Directly Regulate the Type IX Secretion Genes but Binds the PorL Subunit

    Science.gov (United States)

    Vincent, Maxence S.; Durand, Eric; Cascales, Eric

    2016-01-01

    The Type IX secretion system (T9SS) is a versatile multi-protein complex restricted to bacteria of the Bacteriodetes phylum and responsible for the secretion or cell surface exposition of diverse proteins that participate to S-layer formation, gliding motility or pathogenesis. The T9SS is poorly characterized but a number of proteins involved in the assembly of the secretion apparatus in the oral pathogen Porphyromonas gingivalis have been identified based on genome substractive analyses. Among these proteins, PorY, and PorX encode typical two-component system (TCS) sensor and CheY-like response regulator respectively. Although the porX and porY genes do not localize at the same genetic locus, it has been proposed that PorXY form a bona fide TCS. Deletion of porX in P. gingivalis causes a slight decrease of the expression of a number of other T9SS genes, including sov, porT, porP, porK, porL, porM, porN, and porY. Here, we show that PorX and the soluble cytoplasmic domain of PorY interact. Using electrophoretic mobility shift, DNA-protein co-purification and heterologous host expression assays, we demonstrate that PorX does not bind T9SS gene promoters and does not directly regulate expression of the T9SS genes. Finally, we show that PorX interacts with the cytoplasmic domain of PorL, a component of the T9SS membrane core complex and propose that the CheY-like PorX protein might be involved in the dynamics of the T9SS. PMID:27630829

  12. Desenvolvimento de um kit de irrigação por microtubos com moto-bomba propulsionada por energia solar

    OpenAIRE

    Luiz Ricardo Sobenko

    2016-01-01

    O bombeamento de água por meio da energia solar vem se mostrando uma alternativa para localidades onde outras fontes de energia não estão disponíveis ou são limitadas. Torna-se interessante aliar essa alternativa a um sistema de irrigação que opera com vazão e pressão relativamente baixas, como a irrigação localizada por microtubos, possibilitando assim a obtenção de alta eficiência. No presente trabalho teve-se por objetivo dimensionar e avaliar um kit de irrigação por microtubos, alimentado...

  13. Nuclear magnetic resonance in the evaluation of the disk luxation in the temporomandibular articulation conditioned for degenerative osseous changes; Resonancia magnetica nuclear en la valoracion de la luxacion discal en la articulacion temporomandibular condicionada por cambios degenerativos oseos

    Energy Technology Data Exchange (ETDEWEB)

    Marchegiani, Silvio; Guzman Urquhart, Romel; Marangoni, Alberto; Alvarez, Federico; Surur, Alberto [Sanatorio Allende, Cordoba (Argentina). Servicio de Diagnostico por Imagenes

    2006-07-01

    incidencia de la patologia de acuerdo al sexo, relacionar las luxaciones del disco interarticular con los cambios degenerativos oseos, relacionar la falta de reduccion del disco luxado en la apertura bucal, con los cambios degenerativos oseos, y evaluar la utilidad de la RM en el estudio de la articulacion temporo-mandibular. Material y metodo: Se evaluaron 215 pacientes, estudiados desde enero de 1999 a agosto de 2004. Se excluyeron a pacientes portadores de material ferromagnetico o que presentaron sindrome de claustrofobia. Se utilizo un equipo Elscint de 2 tesla de campo magnetico, con bobina especifica y secuencias T1 y T2 con supresion grasa. Se evaluaron: luxaciones (reductibles y no reductibles), cambios degenerativos oseos, osteocondritis, cambios degenerativos discales, perforaciones discales, y lesiones retrodiscales. Resultados: De los 215 pacientes, se analizaron 175 pacientes que presentaron anormalidades en el estudio por IRM. Los 40 pacientes restantes fueron excluidos por presentar un estudio de (IRM) normal. De estos 175 pacientes, 146 fueron mujeres y 29 hombres. La luxacion mas comun fue la anterior y la demostracion de las lesiones articulares y la artrosis por IRM fue satisfactoria en todos los casos. Discusion: en nuestro trabajo la disfuncion de la ATM mas comun fue la luxacion anterior, concordando con otros autores. Se encontro una relacion exacta entre las luxaciones no reductibles, con cambios degenerativos oseos. Conclusion: Se demuestra que la IRM es el examen de eleccion para evaluar la ATM. El sexo femenino es el mas afectado por este tipo de patologia. La luxacion del disco es la alteracion mas frecuente encontrada en la disfuncion de la ATM, demostrando que en pacientes con osteofitosis marginales del condilo no fue posible la reduccion del disco. (autor)

  14. Neuropatia experimental por DDT: análise de nervo por microdissecção de fibras

    Directory of Open Access Journals (Sweden)

    Edison Matos Nóvak

    1984-09-01

    Full Text Available Estudou-se o nervo gênito-femural do rato albino submetido a intoxicação crônica por DDT, administrado por 180 dias na dose de 5 mg/kg de peso via oral. Os resultados mostraram proporção anormal de fibras tipo C, sendo sugerido ocorrer degeneração tipo axonal determinada pelo DDT.

  15. Uses and updating of the Benders method in the integer-mixed programming in the planning of the electric power systems expansion; Usos y actualizacion del metodo de Benders en la programacion entera-mixta y en la planeacion de la expansion de los sistemas electricos de potencia

    Energy Technology Data Exchange (ETDEWEB)

    De la Torre Vega, Eli

    1997-04-01

    of some potential improvements that the proposed method has. [Espanol] En el primer capitulo se presenta la deduccion de los cortes de Benders partiendo de las propiedades de la dualidad. Tambien se presentan las propiedades de los cortes de Benders asi como el algoritmo inicial de Benders para resolver cualquier problema de programacion lineal entera-mixta. En el segundo capitulo, se presenta el problema de la planeacion de la expansion de los medios de generacion y transmision en un sistema electrico de potencia, las distintas estructuras de la programacion matematica a que da lugar y como se puede adaptar el metodo de Benders a estas. En el tercer capitulo se presentan las aportaciones teoricas de este trabajo: a) Como inicializar el problema maestro para aprovechar la experiencia adquirida despues de haber resuelto un problema similar, de modo que se pueda resolver mas eficientemente, la sucesion de problemas de programacion lineal entero-mixtos que surgen al resolver el problema de la planeacion de la expansion de los medios de generacion y transmision en un sistema electrico de potencia. b) Como generar un problema maestro cuya solucion optima continua corresponda al optimo continuo del problema entero-mixto, de modo que la busqueda de soluciones enteras se realice en la vecindad del optimo continuo. c) Como generar una solucion entera, cercana al optimo continuo del problema entero-mixto, que tenga mucha probabilidad de ser factible, y que quizas sea la solucion optima entera, en un tiempo menor al que se requiere para resolverlo en forma exacta. Ademas, se presentan otras ideas que se le pueden incorporar al metodo de Benders. A fin de mostrar la efectividad de las ideas propuestas, en el capitulo 4 se presentan los resultados obtenidos al resolver varios problemas usando: 1. El metodo de Benders in actualizacion, 2. El metodo de Ramificacion y Acotamiento, 3. La actualizacion de Benders al agregar restricciones y 4. La actualizacion de Benders al considerar

  16. Por y para en los manuales de ELE

    Directory of Open Access Journals (Sweden)

    Sidoti, Rossana

    2008-12-01

    Full Text Available La oposición por / para es una de las cuestiones gramaticales que comportan mayor dificultad a la hora de acercarse al estudio del español como L2 sobre todo cuando remiten a conceptos lingüísticos difíciles de entender por no tener ésta referente alguno en el mundo extralingüístico. Si, por un lado, nos resulta fácil entender lo que tiene un referente en el mundo concreto; por otro, no podemos advertir el referente extralingüístico de preposiciones como por / para, si este no existe. Si las preposiciones son elementos abstractos, difíciles de aferrar de por sí, podemos sólo examinar los elementos que éstas ponen en relación y en qué contextos esta relación se determina. Para poder utilizar con precisión las dos preposiciones, es importante no reducirlas a una sola preposición como ocurre en otros idiomas, y sobre todo no relacionarlas sólo a los conceptos de causa y finalidad. Este trabajo se propone individualizar los manuales de español como lengua extranjera más utilizados en las universidades italianas para luego comparar las distintas fuentes de información sobre por / para y exponer comentarios, reflexiones y sugerencias sobre el tema con el fin de precisar en qué medida se puede mejorar lo que los manuales reducen o generalizan, puesto que para los estudiantes de ELE estos representan una herramienta valiosa a la que acudir.

  17. Il metodo mitico e i cattivi pensieri

    Directory of Open Access Journals (Sweden)

    Elio Franzini

    2012-05-01

    Full Text Available Moving from a definition of his « mythical method», the essay aims to outline the so-called «Philosophy of Art» of Paul Valéry. It sketches a portrait of the French author as an authentic philosopher of phenomenology able to define in a non-abstract way what must be intended with «aesthetics».

  18. Le narrazioni come metodo di indagine sociologica

    Directory of Open Access Journals (Sweden)

    Rita Bichi

    2012-04-01

    Full Text Available L'incontro trentino ha dimostrato l'interesse crescente dei giovani sociologi per lo sviluppo dei metodi narrativi e la capacità che questi hanno di essere efficaci nell'analisi di svariati temi, dai racconti di malattia alle narrazioni identitarie, dallo studio di lavoro e organizzazioni a quello delle migrazioni, di genere e memoria. Tuttavia, l'interesse della sociologia italiana va visto in un quadro di sviluppo più ampio a livello europeo e americano dove, a partire dagli anni '90, l'intervento di alcuni autori come Lyotard, Bruner e Macintyre, ha sancito quella che alcuni autori hanno definito svolta narrativa. La sociologia, infatti, tende sempre più a valorizzare la narrazione come processo di conoscenza peculiare che è attivato costantemente nella vita quotidiana; la "rivoluzione" risiede nel fatto che la narrazione diventa oggetto della sociologia e la disciplina stessa valorizza il suo uso sia come strumento di indagine scientifica, sia come modo di conoscere che come modo di comunicare, rivendicando la legittimità scientifica all'ascolto della parola diretta degli individui coinvolti all'interno delle ricerche di stampo sociologico.

  19. The isotope-dilution method of fluorine microestimation; Microdosage du fluor pur dilution isotopique; Mikroopredelenie ftora no metodu razbavleniya izotopov; Microvaloracion del fluor por dilucion isotopica

    Energy Technology Data Exchange (ETDEWEB)

    Kudahl, J N; Fremlin, J H; Hardwick, J L [Department of Physics, University of Birmingham (United Kingdom)

    1962-01-15

    des matieres organiques peuvent etre reduites en cendres en toute securite si des ions de calcium ou de magnesium sont presents. La precision de la methode ne depend pas de la concentration du fluorure jusqu'a concurrence de valeurs representant une fraction d'une ppm. (author) [Spanish] El vidrio adsorbe los iones fluoruro de las soluciones acidas, y si estas soluciones contienen menos de 100 ppm de fluor, la cantidad adsorbida varia muy regularmente en funcion de la concentracion. El metodo empleado por los autores consiste en anadir a cada uno de los integrantes ele una serie de soluciones acidas, que pueden contener unos miligramos, o menos, de fluoruro, un cierto volumen de una solucion del isotopo inestable {sup 18}F libre de portador. Si estas soluciones se aplican a un area determinada de vidrio, parte del {sup 18}F es adsorbida y puede ser fijada elevando el pH una vez alcanzado el equilibrio. La radiactividad del vidrio constituye una medida de la cantidad total de fluoruro presente sobre el vidrio, y puede utilizarse para trazar una isotermia de adsorcion de la cual se puede deducir el contenido en fluor de una solucion desconocida de la serie. Luego de estudiar los efectos del pH de la presencia de iones calcio y fosfato, los autores ban comprobado que las sustancias organicas pueden ser calcinadas sin peligro alguno siempre que se encuentreu presentes iones calcio o magnesio. La precision del metodo no depende de la concentracion de fluoruro siempre que esta sea inferior a 1 ppm. (author) [Russian] Ion ftora iz kislotnogo rastvora adsorbiruetsya na steklo, i dlya rastvorov, soderzhashchikh menee 100 chastej ftora na million, adsorbiruemoe kolichestvo izmenyaetsya ochen' regulyarno v zavisimosti ot kontsentratsii. K kazhdomu iz kislotnykh rastvorov ftora v dannoj serii, ne prevyshayushchikh po vesu neskol'kikh milligrammov, a to i men'she, dobavlyaetsya nekotoryj ob{sup e}m svobodnogo ot nositelej rastvora neustojchivogo izotopa F{sup 18}. Esli rastvory

  20. Riesgos antrópicos generados por la actividad minera

    Directory of Open Access Journals (Sweden)

    Ana Violeta Argüello Mejía

    2013-10-01

    Full Text Available Las actividades productivas generan riesgos antrópicos [1] a mediano y largo plazo. La zona de estudio se ubica en las Parroquias de Pomasqui, San Antonio y Calacalí, donde se han producido riesgos debido a las actividades humanas, en este caso, por la explotación de las canteras para abastecer el mercado de la construcción del Distrito Metropolitano de Quito. La investigación propone determinar los riesgos antrópicos generados por la actividad minera. Los pobladores de la zona identifican que la minería artesanal en sus inicios constituyó una fuente de trabajo, donde sus familias también se involucraban. Actualmente, se observa que en la mayoría de las canteras se utiliza maquinaria especializada y no participan los trabajadores de la zona. Los taludes de las canteras son de 80o y 90o grados, generando amenazas para los trabajadores y moradores de las viviendas aledañas. Uno de los mayores impactos es la contaminación del aire, sin embargo, el suelo y los cursos de agua están siendo afectados por los desperdicios que produce la actividad minera. La población, que está expuesta permanentemente al polvo ocasionado por las canteras y al transporte de material, acusa enfermedades de tipo respiratorio. Así mismo, el ruido ocasionado por el transporte constituye una molestia constante para los pobladores.

  1. Angular distributions of fast neutrons scattered by Al, Si, P, S and Zn; Distributions angulaires des neutrons rapides diffuses par Al, Si, P, S et Zn; Usloviya raspredeleniya bystrykh nejtronov, rasseyannykh alyuminiem, kremniem, fosforom i tsinkom; Distribuciones angulares de neutrones rapidos dispersados por Al, Si, P, S y Zn

    Energy Technology Data Exchange (ETDEWEB)

    Tstjkaija, K; Tanaka, S; Maeuyama, M; Tomita, Y [Japan Atomic Energy Research Institute, Tokai-Mtjea (Japan)

    1962-03-15

    Differential scattering cross-sections of Al, Si, P, S and Zn for fast neutrons have been measured in an energy range of 3.4 to 4.6 MeV by using the time-of-flight method. Angular distributions of the inelastically scattered neutrons are nearly isotropic in all cases. These results are discussed on the basis of the Hauser-Feshbach theory. (author) [French] Les sections efficaces differentielles de diffusion de Al, Si, P, S et Zn pour des neutrons rapides ont ete mesurees dans la gamme d'energies de 3,4 a 4,6 MeV, en employant la methode du temps de vol. Les distributions angulaires des neutrons diffuses inelastiquement sont presque isotropes dans tous les cas. Les auteurs analysent ces resultats en se fondant sur la theorie de Hauser-Feshbach. (author) [Spanish] Los autores han medido por el metodo del tiempo de vuelo las secciones eficaces diferenciales de dispersion del Al, Si, P, S y Zn para neutrones rapidos de energia comprendida entre 3,4 y 4,6 MeV. Las distribuciones angulares de los neutrones dispersados inelasticamente son casi isotropicas en todos los casos. Los autores analizan los resultados obtenidos basandose en la teoria de Hauser-Feshbach . (author) [Russian] Differentsial'no e sechenie rasseyaniya alyuminiya, kremniya, fosfora, sery i tsinka dlya bystrykh nejtronov izmereno v diapazone ehnergii ot 3,4 do 4,6 Megaehlektronvol't ispol'zovanie m metoda vremeni proleta. Uglovye raspredeleniya neuprugo rasseyannykh nejtronov yavlyayutsya pochti vo vsekh sluchayakh izotropnymi. Jeti rezul'taty obsuzhdayutsya na osnove teorii Hauzera-Feshbakha. (author)

  2. Monte Carlo simulation of the dose distribution around the {sup 125}I model 6711 seed as function of radius of the silver cylinder using the Penelope code; Simulacion por el Metodo de Monte Carlo de la distribucion de dosis alrededor de la semilla de {sup 125}I modelo 6711 en funcion del radio del cilindro de plata usando el codigo Penelope

    Energy Technology Data Exchange (ETDEWEB)

    Nerio, U. [Universidad de Cordoba, Monteria (Colombia); Instituto Nacional de Cancerologia, Bogota (Colombia); Chica, L. [Universidad Nacional de Colombia, Bogota (Colombia); Paul, A. [Universite de la Mediterranee, Marseille (France)

    2004-07-01

    The Monte Carlo method is applied to find the dose rates distribution in tissue around {sup 125} I seeds model 6711 as a function of the silver cylinder radius, R{sub sc} (0.017, 0.021, 0.025, 0.029 and 0.033) cm are used as radius values. It is found here that the dose rate at any point within the tissue decreases as R{sub sc} increases. The relative difference of dose rate that produced by the standard R{sub sc} seed, is less than 5%, for seeds with Rsc between 0.017 and 0.033 cm. (author)

  3. Preparation of Pt Ru/C + rare earths by the method of reduction by alcohol for the electro-oxidation of ethanol; Preparacao de eletrocatalisadores PtRu/C + terras raras pelo metodo da reducao por alcool para a eletro-oxidacao do etanol

    Energy Technology Data Exchange (ETDEWEB)

    Tusi, M M; Rodrigues, R M.S.; Spinace, E V; Oliveira Neto, A., E-mail: aolivei@ipen.b, E-mail: espinace@ipen.b [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2010-07-01

    PtRu/C electrocatalyst was prepared in a single step, while that PtRu/85%C-15%Ce, PtRu/85%C-15%La, PtRu/85%C-15%Nd and PtRu/85%C-15%Er electrocatalyst were prepared in a two step. In the first step a Carbon Vulcan XC72 + rare earth supports were prepared. In the second step PtRu electrocatalyst were prepared by an alcohol-reduction process using ethylene glycol as solvent and reducing agent and supported on Vulcan XC72 + earth rare. The obtained electrocatalysts were characterized by EDAX, XRD and chronoamperometry. The electro-oxidation of ethanol was studied by chronoamperometry at room temperature. PtRu/85%C- 15%Ce electrocatalyst showed a significant increase of performance for ethanol oxidation compared to PtRu/C electrocatalyst. (author)

  4. Morphological and structural characterization of the Zn{sub 0,9}Mn{sub 0,1}O powder synthesized by combustion reaction and Pechini; Caracterizacao estrutural e morfologica de pos de Zn{sub 0,9}Mn{sub 0,1}O sintetizados por reacao de combustao e metodo Pechini

    Energy Technology Data Exchange (ETDEWEB)

    Ribeiro, M A; Torquato, R; Simoes, A N; Costa, A C.F.M.; Gama, L [Universidade Federal de Campina Grande (DEMA/UFCG), PB (Brazil). Dept. de Engenharia dos Materiais; Kiminami, R H.G.A. [Universidade Federal de Sao Carlos (DEMA/UFSCar), SP (Brazil). Dept. de Engenharia de Materiais

    2009-07-01

    Zinc oxide, due to the piezoelectric and electro-optical characteristics, is used in application such as, chemical sensor, varistor, transparent conductive thin film and DMS. The aim of this work is to evaluate and compare structural and morphological characteristics of nanometric powders of Zn{sub 0,9}Mn{sub 0,1}O prepared by chemical synthesis of combustion reaction and Pechini method. The powders were characterized by XRD, SEM and BET. The XRD data shown to both studied method the presence of ZnO phase with hexagonal structure and without second phase. The powder prepared by combustion reaction presented 9% of reduction in crystallinity and 42% of increase in surface area in comparison with the powder prepared by Pechini method. The morphological analysis of the powder showed that both method produce powders with soft agglomerates constituted by nano size particles. (author)

  5. k{sub 0}-INAA application at IPEN Neutron Activation Laboratory by using the k{sub 0}-IAEA program: biological sample analysis; Aplicacao do metodo k{sub 0}-INAA no Laboratorio de Analise por Ativacao com Neutrons do IPEN utilizando o programa k{sub 0}-IAEA: analise de amostras biologicas

    Energy Technology Data Exchange (ETDEWEB)

    Puerta, Daniel Correa

    2013-07-01

    The results obtained in the application of the k{sub 0}-standardization method at LAN-IPEN for biological matrices analysis, by using the k{sub 0}-IAEA software, provided by the International Atomic Energy Agency (IAEA), are presented. The flux parameters f and a of the IEA-R1 reactor were determined for the pneumatic irradiation facility and for one selected irradiation position, 24B/shelf2, for short and long irradiations, respectively. In order to obtain these parameters, the bare triple-monitor method with {sup 197}Au-{sup 96}Zr-{sup 94}Zr was used. In order to evaluate the accuracy and precision of the methodology, the biological reference materials Peach Leaves (NIST SRM 1547), Mixed Polish Herbs (INCT-MPH-2) e Tomato Leaves (NIST SRM 1573a) were analyzed. The statistical criteria Relative Errors (bias, %), Coefficient of Variation (CV) and U-score were applied to the obtained results (mean of six replicates). The relative errors (bias, %) in relation to certified values, were, for most elements, in the range of 0 e 30. The Coefficients of Variation were below 20%, showing a good reproducibility of the results. The U-score test showed that all results, except Na in Peach Leaves and in Tomato Leaves, were within 95% confidence interval. These results point out to a promising use of the k{sub 0}-INAA method at LAN-IPEN for biological sample analysis. (author)

  6. Alternative method of portable irradiation of manganese sulphate solution by an plutonium-beryllium source for manganese sulphate bath efficiency measurements; Metodo alternativo de irradiacao portatil da solucao de sulfato de manganes por uma fonte de plutonio-berilio para medicoes de eficiencia do banho de sulfato de manganes

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Fellipe Souza da; Martins, Marcelo Marques; Pereira, Walsan Wagner, E-mail: fellipess@ird.gov.br [Instituto de Radioprotecao e Dosimetria (IRD/CNEN-RJ), Rio de Janeiro, RJ (Brazil)

    2016-07-01

    This study intends to create an alternative irradiation system from a Plutonium-Beryllium source for manganese sulphate solution using the Monte Carlo code. Thus seeking to eliminate the issue of institutes that do not have reactors or particle accelerators in its infrastructure, in order to optimize and provide independence for them to carry out efficiency measurements of MnSO{sub 4} solution in their own locality. The Monte Carlo simulations defined the technical features of this new system so that the solution reaches the maximum neutron capture by manganese in solution. (author)

  7. Manufacturing and characterization of ceramic pigment Zn{sub 1-x}Fe{sub x}Cr{sub 2}O{sub 4} by synthetic non conventional methods; Fabricacion y caracterizacion del pigmento ceramico Zn{sub 1-x}Fe{sub x}Cr{sub 2}O{sub 4} por metodos de sintesis no convencionales

    Energy Technology Data Exchange (ETDEWEB)

    Nieves, Leidy Johana Jaramillo; Baena, Oscar Jaime Restrepo, E-mail: ojrestre@unal.edu.co [Universidad Nacional de Colombia, Medellin (Colombia). Facultad de Minas

    2012-07-01

    The ceramic pigment with structure Zn{sub 1-x}Fe{sub x}Cr{sub 2}O{sub 4} (x = 0, 0.5, 1) was synthesized by non conventional methods of coprecipitation assisted by ultrasound and milling of high energy. This pigment was characterized by XRD, XRF, SEM, UV-VIS spectrophotometry and CIELab colorimetry. The aim of this work was studied two alternative methods to the traditional method of synthesis, evaluating the pigment properties, varying the stoichiometry, such as structure, composition, morphology and colorimetric coordinates. The results showed that is possible to obtain the desired crystalline structure at temperatures below 1000 ° C in both cases, also expected hues are obtained according to each stoichiometry, which shows the advantages of using methods non conventional when produce these pigments, since it has a higher controlling the composition, stoichiometry and is obtained at temperatures below compared with traditional ceramic method.

  8. Method for determining microamounts of uranium in solutions from copper ores, by liquid-liquid extraction and spectrophotometry with arsenazo III.; Metodo para determinar microcantidades de uranio en disoluciones de minerales de cobre, por extraccion liquido-liquido y espectrofotometria con arsenazo III

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez, B.

    1972-07-01

    A spectrophotometric method is described for determining small amounts of uranium in aqueous solutions from copper ores. Uranium is quantitatively separated in a single extraction by a solution of tri-n-octylphosphine oxide in benzene, using ethylendiaminetetracetic acid and sodium fluoride as complexing agents, for improving the selectivity of the procedure. An aliquot of the extract is diluted with a hydrocolloidal solution of arsenazo III. Optical density is measured at 650 nm. (Author) 3 refs.

  9. Application of the efficiency tracing method to the liquid scintillation metrology of 3H and 14C dual-labelled samples; Aplicacion del metodo de la figura de merito a la metrologia por centelleo liquido de muestras doblemente marcadas con 3H y 14C.

    Energy Technology Data Exchange (ETDEWEB)

    Martin-Casallo, M. T.; Los Arcos, J. M.; Grau, A.

    1989-07-01

    Two calculation procedures have been tested for the application of the efficiency tracing method to the activity determination of 3H and 14C dual- -labelled samples in the liquid scintillation metrology. A procedure Ieads to the statement of a linear equations system as a function of the quenching parameter, while the other one uses a least-square algorithm to fit the total count rate against the quenching parameter. The first procedure is strongly sensitive to the statistical uncertainty on the partial efficiencies and produces discrepancies which may reach more than 100% compared to the real values. The second procedure leads to more reliable results, showing discrepancies between 0.1% and 0.6% for the 3H activity and between 0.6% and 5% for the 14C activity, as that the efficiency tracing method can be applied to the metro- logy of dual-labelled samples of 3H and 14C by means of this procedure. (Author) 7 refs.

  10. Fabrication of targets for transmutation of americium : synthesis of inertial matrix by sol-gel method. Procedure study on the infiltration of a radioactive solutions; Fabricacion de blancos para la transmutacion de americio: sintesis de matrices inertes por el metodo sol-gel. Estudio del procedimiento de infiltracion de disoluciones radiactivas

    Energy Technology Data Exchange (ETDEWEB)

    Fernandez Carretero, A [Universidad Complutense de Madrid (Spain)

    2002-07-01

    Transmutation and incineration are innovative options in the management and disposal of fission products and actinides. nevertheless, the fabrication of targets for transmutation and incineration of actinides and fission products require a reconsideration of conventional processes (mechanical blending) and the development of new procedures compatible with the high activity of these materials. This work presents th R and D of a new fabrication method called INRAM (Infiltration of Radioactive Materials) based on the infiltration of an actinide solution in a porous non radiotoxic material in the form of a pellet (up to 12% An), or beads (up to 40% An) produced by sol-gel. The first method have been used for the fabrication of spinel (MgAl{sub 2}O{sub 4}) targets containing 11% Am, which have been irradiated in HFR-Petten (358.4 full power days). Post-test burn-up calculations showed that at the end of the irradiation the initial Am-241 concentration was reduced to 4%. The fraction of the initial americum atoms that have been fissioned is 28%. The main advantage of the INRAM method is that matrices with low or zero activity can be fabricated and formed into the required shape in an unshielded facility. This method offers other advantages over conventional ones, such as the active wastes are reduced, is easy to automate, adoptable to telemanipulation and dust free, which facilitate operator intervention and minimise radiation exposure to the personal. In addition, the infiltrant needs only be present in liquid form, i. e. it could be transferred directly from the reprocessing plant for fabrication into targets without conversion into-solid form. In order to optimise the infiltration process in depth investigations of all important process parameters, e. g. infiltration kinetics and metal (pu, Am) concentration in the feed solution, and also on extensive study or powder metallurgy parameters for the preparation of high quality fuel pellets with a high density, have been made. In addition a new and unexpected phase formed by the reaction of americium with spinel during the high temperature synthesis process has been identified. This new phase could provide a unique menas to stabilise Am in one particular oxidation state. (Author)

  11. 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)

  12. Elaboration of Co-60 sources on gilding vyns, with beta efficiencies 80 % or better and its activity measure by the coincidences method; Elaboracion de fuentes de Co-60 sobre vyns dorado, con eficiencias beta del 80 % o mejor y su medida de actividad por el metodo de coincidencias

    Energy Technology Data Exchange (ETDEWEB)

    Cortes P, A.; Tejera R, A.; Becerril V, A.; Ortiz C, A

    1991-12-15

    The measuring technique of radioactive activity by the coincidences method 4 {pi} {beta}{sup -} {gamma} it requires of the elaboration of radioactive sources on thin supports in order to flows the biggest percentage of beta particles, those of the order of the 80 % or but. In this work a procedure for the elaboration of this type of sources, with gilding Vyns is reported. (Author)

  13. Comparison among structural characteristics of Ce{sub 1-x}Cu{sub x}O{sub 2} nanocatalysts obtained by two methods of distinct synthesis; Comparacao entre as caracteristicas estruturais dos nanocatalisadores Ce{sub 1-x}Cu{sub x}O{sub 2} obtidos por dois metodos de sintese distintos

    Energy Technology Data Exchange (ETDEWEB)

    Neiva, L.S.; Bispo, A.; Santos, P.T.A.; Costa, A.C.F.M.; Gama, L., E-mail: lucianna@dema.ufcg.edu.b [Universidade Federal de Campina Grande (UFCG), PB (Brazil). Dept. de Engenharia de Materiais; Mascarenhas, A.J.S. [Universidade Federal da Bahia (UFBA), Salvador, BA (Brazil). Inst. de Quimica

    2009-07-01

    The objective this work is to synthesize nano catalysts Ce{sub 1-x}Cu{sub x}O{sub 2} type by the synthesis methods of the combustion reaction and Pechini. The value of the concentration (x) of the element dope (Cu) varies between 0,1 and 0,5 mols. It intends evaluate that form the synthesis method influences in the physical structural characteristics of this material. nano catalysts were characterized by ray- X diffraction. The results showed nano catalysts formation with a formed structure for the most part by the phase CeO{sub 2}, as it was expected, since this is the hostess matrix of the element dope (Cu). Nano catalysts obtained by the method Pechini presents crystallinity larger deg, according with patterns of ray-X. Thus, it was concluded that synthesis employee method the kind in the methodology, as well as the value of the concentration of the element dope has influence on the final structural characteristics of the developed material. (author)

  14. Calibration of SPND/Rhodium device for mapping the neutron fluence in the IEA-R1 reactor by means of the activation foil method; Calibracao de um dispositivo de mapeamento de fluxo de neutrons - SNPD/Rodio no reator IEA-R1, por meio do metodo de ativacao de folhas

    Energy Technology Data Exchange (ETDEWEB)

    Ricci Filho, Walter; Dias, Mauro S.; Tondin, Julio B.M.; Koskinas, Marina F. [Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil)

    2002-07-01

    The IEA-R1 reactor has undergone a modernization to increase its operating power to 5 MW, in order to allow a more efficient production of radioisotopes. The objective of this work is to provide the reactor with flux monitoring device using a rhodium Self-Powered Neutron Detector (SPND). The work presents the results obtained with Rhodium-SPND in several irradiation positions inside the reactor core. A calibration procedure has been performed by means of {sup 197} Au activation foils, with and without cadmium cover, in order do measure the thermal and epithermal neutron fluxes. (author)

  15. Fitting of two and three variant polynomials from experimental data through the least squares method. (Using of the codes AJUS-2D, AJUS-3D and LEGENDRE-2D); Ajuste de polinomios en dos y tres variables independientes por el metodo de minimos cuadrados. (Desarrollo de los codigos AJUS-2D, AJUS-3D y LEGENDRE-2D)

    Energy Technology Data Exchange (ETDEWEB)

    Sanchez Miro, J J; Sanz Martin, J C

    1994-07-01

    Obtaining polynomial fittings from observational data in two and three dimensions is an interesting and practical task. Such an arduous problem suggests the development of an automatic code. The main novelty we provide lies in the generalization of the classical least squares method in three FORTRAN 77 programs usable in any sampling problem. Furthermore, we introduce the orthogonal 2D-Legendre function in the fitting process. These FORTRAN 77 programs are equipped with the options to calculate the approximation quality standard indicators, obviously generalized to two and three dimensions (correlation nonlinear factor, confidence intervals, cuadratic mean error, and so on). The aim of this paper is to rectify the absence of fitting algorithms for more than one independent variable in mathematical libraries. (Author) 10 refs.

  16. Study of the free and proteic amino acids content in potato tubers by fours different methods of preservation, and stored during five months; Estudio del contenido en aminoacidos libre y proteicos en tuberculos de patata tratados por cuatro metodos de conservacion y almacenados durante cinco meses

    Energy Technology Data Exchange (ETDEWEB)

    Fernandez Gonzalez, J; Aguirre Alfaro, A

    1976-07-01

    The present work studies the qualitative and quantitative content in free and proteic aminoacids of the potato tubers stored during five months. The results obtained in tubers treated with maleic hydrazide, isopropyl carbanilate (IPC), refrigeration and gamma irradiation, are compared with those from tubers control without treatment. There are no significant differences in the relative proportion of the aminoacids from the tubers treated by different methods, but they do exist significant differences when compared with the non treated controls. (Author) 46 refs.

  17. Regional assessment of seismically induced slope instabilities in the Lorca Basin (Murcia): Implementation of New marks method in a GIS; Evaluacion regional de inestabilidades de ladera por efecto sismico en la Cuenca de Lorca (Murcia): Implementacion del metodo de Newmark en un SIG

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez Peces, M. J.; Garcia Mayordomo, J.; Azanon Hernandez, J. M.; Jabaloy Sanchez, A.

    2008-07-01

    The Lorca Basin (Murcia, SE Spain) exhibits a high seismic activity because some of the most active faults in Spain have been identified in the surroundings of this basin and there are well known cases of rock-falls associated to specific earthquakes (e.g., Mula 1999, Bullas 2002, La Paca 2005). In this area, we have used a geographic information system (GIS) to develop an implementation for the Newmarks sliding rigid block method at a regional scale. In addition, we have particularly proposed a new small variation of Newmarks method to consider soil and topographic amplification effects. Subsequently, we produce Newmark displacement maps for both deterministic and probabilistic seismic scenarios in the Lorca Basin. The estimation of static safety factor for each pixel of study area has allowed obtaining the critical acceleration (ac) map that represents seismically induced slope instability susceptibility. The obtained Newmark displacement maps allowed us to identify areas with the highest potential seismic hazard as well as interesting areas for future particular studies. The results predict the majority of identified instabilities in previous studies (mainly, rock-falls) and rock-falls associated with specific earthquakes with values of Newmark displacement lower than 2 cm. Larger instabilities and landslides occur with Newmark displacement higher than 2 cm assuming that a great earthquake (Mw=6.7-6.8) take place. (Author)

  18. Dosimetric impact of the variation of the conversion feature of hounsfield units to mass density in the simulation by the method of Monte Carlo in radiotherapy treatment; Impacto dosimetrico de la variacion de la funcion de conversion de unidades hounsfield a densidad de masa en la simulacion por el metodo de Monte Carlo de un tratamiento de radioterapia

    Energy Technology Data Exchange (ETDEWEB)

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

    2013-07-01

    The study focuses on linear transformations which are made on the study of TC to get the array of mass densities, and how affects the variation of these transformations in clinical dosimetry. (Author)

  19. Evaluation and standardization of neutron activation analysis according to the K{sub 0} method in the RP-10 reactor; Evaluacion y estandarizacion del analisis por activacion neutronica segun el metodo del K{sub 0} en el reactor nuclear RP-10

    Energy Technology Data Exchange (ETDEWEB)

    Montoya R, E

    1995-06-01

    It has been characterized and standardized an irradiation of the RP-10 Research Nuclear Reactor for use of the K{sub 0} method of neutron activation analysis using the Hoegdahl convention; also it has been evaluate the behaviour of such method in regard to the accuracy and precision of the results obtained in the quantitative multi elemental analysis of several certified materials of reference. In order to prove that the analytical method is totally under statistical control, it has been used the Heydorn method. It has been verified that the method is exact, precise and reliable to determine the aluminium, antimuonium, arsenic, bromine, calcium, chloride, copper, magnesium, manganese, sodium, titanium, vanadium, zinc and other elements. Also, they are discussed, in regard to the use of K{sub 0} constants, the different formalisms employed to calculate the integral of the reaction rate by nucleus in the activation. (author). 58 refs., 18 tabs., 6 figs.

  20. Study on water-sediment interaction in samples from Rio das Velhas - Minas Gerais State - Brazil using instrumental neutron activation analysis, and argon plasma coupled mass spectroscopy; Estudo da interacao agua-sedimento em amostras do Rio das Velhas - MG utilizando os metodos: analise por ativacao neutronica instrumental (INAA) e espectrometria de massa acoplada a um plasma de argonio (ICP-MS)

    Energy Technology Data Exchange (ETDEWEB)

    Veado, Maria Adelaide R.V.; Oliveira, Arno H. de [Minas Gerais Univ., Belo Horizonte, MG (Brazil). Dept. de Engenharia Nuclear; Revel, G.; Pinte, G. [CEA Centre d`Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France). Lab. d`Analyse par Activation Pierre Sue; Toulhoat, P. [CEA Centre d`Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France). Unite Mixte de Recherche Analyse et Environnement

    1999-11-01

    Sorption of the metallic elements in aqueous solutions in surface of the hydroxides affects the transport of heavy elements in the freshwaters. Sorption and the chemistry of the hydroxides are important studies for knowledge in geology, waters and waste treatment, and environment studies. In the industrial mining region areas, the river surface waters are subject to modifications in its physical and chemistries properties: pH, DBO, conductivity and alkalinity. Instrumental neutron activation analysis and inductively coupled plasma-mass spectrometry (ICP-MS), have ben used for the determination of toxic heavy metals and others pollutants in the Das Velhas river in State of Minas Gerais, in south-east Brazil. Water samples were collected with acidification on site, which provoked a change of its natural pH. Consequently, metallic elements associated to hydroxides and to particles in suspension were liberated. The objective of this paper is to show the different behavior of any elements, in water of Das Velhas river, with relation of its chemical forms (cations or anions), the solubility degree, the pH and the presence of rare earth elements. (author) 11 refs., 10 figs.; e-mail: adelaide at nuclear.ufmg.br; heeren at nuclear.ufmg.br; grevel at drecam.cea.fr; pierre.toulhoat at cea.fr

  1. Synthesis and characterization of Al{sub 2}O{sub 3} obtained from the polymeric precursor method using glycerin as a poly alcohol; Sintese e caracterizacao de Al{sub 2}O{sub 3} obtida por meio do metodo dos precursores polimericos utilizando glicerina como polialcool

    Energy Technology Data Exchange (ETDEWEB)

    Elicker, C.; Gaier, M.; Almeida, S.R.; Vieiraaa, B.M.; Ratmann, C.W.R.; Pereira, C.M.P. de; Cava, S.S. [Universidade Federal de Pelotas (UFPel), Pelotas, RS (Brazil); Egea, J.J. [Consejo Superior de Investigaciones Cientificas, Madrid (Spain)

    2014-07-01

    In this study, calcium aluminate was synthesized using glycerin to replace ethylene glycol in the polymeric precursor method. The resulting resin was pre-calcined in a muffle at 300 °C for 2 h and the resulting material was calcined at 900 °C for 2 h. The powders were analyzed by XRD, SEM and EDX, TEM, Micro-Raman and IR. The results demonstrated the possibility of using glycerin as an alternative to ethylene glycol in the polymeric precursor method. (author)

  2. Determination of Kr-85 in environmental samples and gaseous effluents from nuclear industries using the standard method; Aplicacion del metodo de concentracion separacion y medida radiactiva por centelleo liquido de Kr-85 en muestras ambientales y en efluentes gaseosos de la industria nuclear

    Energy Technology Data Exchange (ETDEWEB)

    Heras, M c; Perez, M M

    1983-07-01

    The determination of the Kr-85 activity in environmental samples and gaseous effluents from Spanish Nuclear Power Stations is described. The method employed has been published elsewhere. The determinations has been carried out in environmental samples token at JEN Laboratories (Madrid) and the Nuclear Power Stations, Jose Cabrera (Zorita), Garona and Vandellos. Also samples of gaseous effluents of the three plants has been analyzed. Values of the Kr-85 environmental background activity in the Almaraz Nuclear Power Stations, has been determined, before the beginning of its nuclear activity. In this paper the sampling equipment used is described and the values found of Kr-85 activity in all the samples in given. (Author) 29 refs.

  3. Application of the optimum reactive power dispatch to the cost establishment for the support voltage in a power electrical system for generalized dispatch; Aplicacion del despacho optimo de potencia reactiva al establecimiento del costo por el soporte de voltaje en un sistema electrico de potencia con despacho centralizado

    Energy Technology Data Exchange (ETDEWEB)

    Barragan Gomez, Sergio Baruch

    2004-05-15

    de operacion. Por lo tanto existe la necesidad de determinar un costo por el soporte de voltaje de los generadores, ya que esta accion es considerada como un servicio auxiliar y es retribuida de manera independiente. En este trabajo, se utiliza el metodo del gradiente para solucionar el despacho de potencia reactiva y determinar el costo por el soporte de voltaje de cada generador participante en el sistema. El despacho de potencia reactiva esta sujeto a restricciones de igualdad que representan las ecuaciones de balance de potencia activa y reactiva de cada nodo y a restricciones de desigualdad que corresponden a los limites en los perfiles de voltaje de todos los nodos del sistema. Las restricciones de igualdad se consideran dentro del problema de optimizacion con el metodo de los multiplicadores de Lagrange y las restricciones de desigualdad a partir de funciones de penalizacion cuadraticas. El costo total por el soporte de voltaje de cada generador esta formado por un costo fijo y un costo variable. El costo fijo se calcula a partir del factor de recuperacion anual del capital invertido en el generador. El costo variable depende de las condiciones de operacion y del costo por perdida de oportunidad del generador. Para determinar el costo total por el soporte de voltaje de los generadores, se considera que el mercado de potencia activa ya ha sido resuelto con anterioridad a traves de un despacho economico de potencia activa. Los sistemas utilizados para la evaluacion del programa desarrollado son: el sistema de 5 nodos y el sistema de 30 nodos de la IEEE.

  4. Measurements of {sup 131}I-Labelled Triiodothyronine Uptake by a Resin as a Means of Diagnosing Iodine-Basedow Produced by Intramuscular Administration of Iodized Oil in an Area of Endemic Goitre; Utilidad de la Prueba de la Captacion de Triyodotironina Marcada con {sup 131}I por Resina en el Diagnostico de Yod-Basedow Producido por la Administracion Intramuscular de Aceite Yodado, en una Area de Bocio Endemico

    Energy Technology Data Exchange (ETDEWEB)

    Fierro-Benitez, R.; Ramirez, I. [Instituto de Ciencias Nucleares, Escuela Politecnica Nacional y Facultad de Medicina, Universidad Central, Quito (Ecuador)

    1970-02-15

    nodular goitres. Among the indices which proved useful for this diagnosis were BEI, T{sub 4}, BMR and, among the various tests with radioiodine (uptake, conversion ratio, PBI %/1/d, urinary excretion, saliva/total plasma, saliva/PBI, salivary clearance, KSCN suppression test) only the measurements of T{sub 3} - {sup 131}I uptake by resin. (author) [Spanish] Les autores efectuaron la administracion intramuscular de aceite yodado con el fin de estudiar sus efectos profilacticos sobre el bocio endemico y defectos asociados, tales como el cretinismo endemico, etc., en areas en las que por su aislamiento, etc,, los metodos tradicionales ofrecen serias limitaciones. Este sistema se us6 en Nueva Guinea; los resultados alli obtenidos indicaron que el metodo redujo la prevalencia del bocio y que su ejecucion era segura y practica. Mas, dado lo remoto del lugar, fue imposible continuar las observaciones y no hubo informacion en cuanto a la efectividad del aceite yodado en reducir la incidencia de los defectos acociados con la endemia. El programa se inicio en Ecuador en Marzo 1966 en la poblacion total de dos comunidades rurales de la region andina. El ultimo control se efectuo tres anos despues. Se inyecto ethiodol (37% de aceite yodado; cada cm3 con un contenido de 450 mg de yodo; Fougera, Hicksville, L.I., N. Y. EE. UU.) por via intramuscular: 2 cm{sup 3} a los sujetos de 12 anos de edad en adelante, y dosis proporcionalmente menores a los mas jovenes. El ethiodol produjo cambios profundos en el comportamiento fisiologico de la tiroides. La captacion de I se deprimio durante 6 meses, para luego mantenerse normal. Igualmente, y desde los primeros controles, el BEI y la T{sub 4} se tornaron y mantuvieron normales, lo cual demostro que inclusive durante los primeros meses la glandula mantenia una capacidad normal para elaborar tironinas, es decir en ellas no se produjo el efecto descrito por Wolff y Chaikoff. El PBI y BII se mantuvieron altos en todos los controles. La excrecion

  5. Itinerario de la Patria: por tierras del golfo lejano

    Directory of Open Access Journals (Sweden)

    Adel López Gómez

    1965-06-01

    Full Text Available Veinticinco años atrás solo primaba en estas infinitudes el imperio de la selva. Desde Dabeiba tórrido hasta Turbo sudoroso y lacustre se empleaba casi una semana a lomo de mula o a quimba de peatón, por una sombría trocha de miasmas y de lodo, abierta a machete por entre la áspera e interminable manigua. Por allí pasaron una y otra vez los pálidos hombres de nuestros enganches, cuando en 1939 iniciamos, a la orilla del Golfo de Urabá, la ingente tarea de construír una carretera hacia el interior para poner al alcance de las llantas antioqueñas la orilla salvaje del Atlántico maicero.

  6. Micetoma pulmonar por Scedosporium sp, reporte de dos casos

    Directory of Open Access Journals (Sweden)

    José G. Somocurcio

    2009-07-01

    Full Text Available Se reporta los dos primeros casos de micetoma pulmonar por Scedosporium sp, en el Perú, tratados quirúrgicamente en el Hospital Nacional Hipólito Unanue. Se practicó resección pulmonar debido a micetoma pulmonar de donde se tomó muestras que fueron enviadas a microbiología y anatomía patológica para cultivo y estudio histopatológico. Se identificó el moho Scedosporium sp en dos pacientes con secuelas cavitarias por tuberculosis, quienes presentaron tos y hemoptisis de dos meses y tres años de evolución, respectivamente. Radiológicamente las cavidades estaban ocupadas por una "bola fúngica". La histopatología indicó presencia de abundantes hifas, indistinguibles de las de Aspergillus sp, mientras que la inmunodifusión para Aspergillus fue negativa.

  7. Retinitis por citomegalovirus en un paciente con VIH

    Directory of Open Access Journals (Sweden)

    Alena de los Ángeles Vejerano Duany

    Full Text Available La retinitis por citomegalovirus es la infección ocular más frecuente en pacientes con un recuento de linfocitos CD4 inferior a 200 por µL. El aspecto oftalmoscópico de las lesiones se caracteriza, en la mayoría de los casos, por infiltrados retinianos resultados de la necrosis retiniana producida por citomegalovirus y el edema en asociación con hemorragias. Estas lesiones se disponen, por lo general, siguiendo las arcadas vasculares temporales con invasión hacia la mácula. Se presentó una paciente de 24 años de edad, femenina, blanca, ama de casa, con antecedentes patológicos personales oculares sin datos de interés, y antecedentes patológicos personales generales de ser diagnosticadas con VIH. Hace cuatro años que comenzó con tratamiento antirretroviral, y tuvo cambios de tratamiento en dos ocasiones. El último fue impuesto en mayo del año 2011, con el cual presentó mala adherencia terapéutica, y comenzó desde entonces a presentar disminución de su peso corporal de forma marcada en breve período de tiempo. Refiere que desde hace unos meses comenzó a presentar una disminución progresiva de la agudeza visual en el ojo derecho, acompañado de visión borrosa. Adquiere gran importancia este caso, ya que ante la supervivencia de los pacientes con sida, va a ser cada vez más frecuente la aparición de las afecciones oculares relacionadas con esta enfermedad. Dentro de ellas se encuentran las infecciones oportunistas mayores como la retinitis por citomegalovirus.

  8. ¿Por qué hay canciones que perduran?

    Directory of Open Access Journals (Sweden)

    Josune Albisu Barandiaran

    2015-11-01

    Full Text Available El principal objetivo de este artículo es analizar una canción, Txoria txori, para deducir cuales han sido las principales características que la han convertido en “Himno popular”, permitiéndola perdurar en el tiempo. Dentro de las principales características, dos han sido verdaderamente reseñables: por una parte, la plasticidad, y por otra, la sencillez y estructura clara de la canción.

  9. Responsabilidad civil por accidentes en espectáculos taurinos

    OpenAIRE

    Caballero Moreno, María Araceli

    2016-01-01

    El trabajo versa sobre la responsabilidad civil aplicada al campo de los espectáculos taurinos, explicando el régimen de responsabilidad aplicable, regulado en el art. 1.902 de nuestro Código Civil, centrándose especialmente en quién debe asumir la responsabilidad en caso de producirse daños a los espectadores del festejo por los propios animales, si la propia víctima por haber llevado a cabo una conducta imprudente aplicando la teoría de la asunción del riesgo o los organizadores del festejo...

  10. Mortalidad por paludismo en Colombia, 1979-2008

    OpenAIRE

    Pablo Chaparro; Julio Padilla

    2012-01-01

    Introducción. En Colombia, el paludismo representa un grave problema de salud pública. Se estima que, aproximadamente, 60 % de la población se encuentra en riesgo de enfermar o de morir por esta causa. Objetivo. Describir la tendencia de la mortalidad por paludismo en Colombia desde 1979 hasta 2008. Materiales y métodos. Se llevó a cabo un estudio descriptivo para determinar la tendencia de las tasas de mortalidad. Las fuentes de información fueron las bases de datos de las defunciones...

  11. Por qué todas las cuentas son falsas

    OpenAIRE

    Aerde, Michel van

    1994-01-01

    Los principales criterios para evaluación y decisión, en la sociedad actual, son inspirados por cálculos económicos. Mucho nos preocupamos de cuentas pero muy poco nos preguntamos de lo que es el dinero. Muy poco reflexionamos filosóficamente, ontológicamente, sobre la naturaleza misma del dinero. ¿Qué es esto que pretende ser la base de nuestra sociedad? El dinero es mentiroso por naturaleza. Es una representación de mucha vida, que no puede ser representada. El dinero es peligroso, se convi...

  12. Riesgos antrópicos generados por la actividad minera

    OpenAIRE

    Ana Violeta Argüello Mejía; Enriqueta Cantos Aguirre; Jorge Vitery Moya

    2013-01-01

    Las actividades productivas generan riesgos antrópicos [1] a mediano y largo plazo. La zona de estudio se ubica en las Parroquias de Pomasqui, San Antonio y Calacalí, donde se han producido riesgos debido a las actividades humanas, en este caso, por la explotación de las canteras para abastecer el mercado de la construcción del Distrito Metropolitano de Quito. La investigación propone determinar los riesgos antrópicos generados por la actividad minera. Los pobladores de la zona identifican qu...

  13. Elasticidad precio de la demanda por autopistas interurbanas en Chile

    OpenAIRE

    Rodrigo Sanes; German Lobos

    2013-01-01

    La efectividad de un esquema de tarificación vial para optimizar el uso de infraestructura de transporte depende de la información que se disponga respecto a la elasticidad precio de la demanda por el uso de puentes, túneles y carreteras. El objetivo de este trabajo es estimar la elasticidad precio de la demanda por el uso de autopistas interurbanas en Chile utilizando el método de regresiones aparentemente no relacionadas (SUR) y un panel de 48 datos mensuales obtenidos a partir de 21 plazas...

  14. Contractura axilar por quemadura tratada con Integra®

    OpenAIRE

    Roa G,Ricardo; Las Heras F,Rocío; Piñeros B,José L; Correa S,Gerardo; Norambuena B,Hernán; Marré N,Diego

    2011-01-01

    Las quemaduras axilares severas son un accidente infrecuente que evolucionan a la retracción generando deficiencias cosméticas y funcionales. Estas cicatrices son difíciles de tratar por las características anatómicas del área, donde la corrección de un vector de movimiento puede alterar otro. Objetivo: Mostrar nuestros resultados utilizando el sustituto cutáneo Integra® en el tratamiento de cicatrices retráctiles axilares por quemadura. Pacientes y Métodos: Se recolectaron antecedentes médic...

  15. Síndrome oculoglandular de Parinaud causada por esporotricose

    OpenAIRE

    Ribeiro,Alexandre Sampaio de Abreu; Bisol,Tiago; Menezes,Marcela Sant'Ana

    2010-01-01

    A síndrome oculoglandular de Parinaud é uma doença ocular rara causada por diferentes agentes etiológicos, entre eles bactérias, vírus e fungos. É caracterizada por uma conjuntivite granulomatosa, acompanhada de linfadenopatia pré-auricular adjacente e pode trazer sequelas caso não seja prontamente tratada. Neste artigo é relatado o caso de uma jovem técnica de enfermagem e estudante de medicina veterinária apresentando a síndrome oculoglandular de Parinaud causada pelo fungo Sporothrix schen...

  16. Mastitis bovina causada por Staphylococcus coagulasa negativos

    OpenAIRE

    Bonetto, César C.

    2014-01-01

    El presente Trabajo de Tesis se desprende como una línea de investigación del grupo de la UNRC dedicado al estudio de la problemática de la mastitis bovina tanto en aspectos básicos como aplicados con estudios genéticos, epidemiológicos y de virulencia de los principales microorganismos involucrados en la mastitis bovina. Staphylococccus coagulasa negativo (SCN) es un grupo bacteriano formado por varias especies que por lo general eran considerados flora oportunista de la piel y age...

  17. Una vuelta al mundo por la educación

    OpenAIRE

    Francisco Amat, Andrea; Molins, María

    2008-01-01

    La Barcelona World Race es una nueva regata vuelta al mundo con dos tripulantes por embarcación y sin escalas en ningún puerto. El pisto letazo de salida se dio el pasado 11 de noviem bre en el Port Olimpic de Barcelona, lugar a donde regresarán los navegantes tras recorrer 25.000 millas, es decir 47.000 kilómetros, por los océanos más hostiles y desafiantes del mundo en monocascos de última generación de la clase IMOCA Open 60. En esta primera edición, participan nueve equipos y uno de ellos...

  18. Neumonitis por hipersensibilidad en la ciudad de México

    Directory of Open Access Journals (Sweden)

    Carrillo-Rodríguez José G.

    2000-01-01

    Full Text Available OBJETIVO: Determinar la asociación entre la zona urbana de origen del paciente en la ciudad de México y la prevalencia de neumonitis por hipersensibilidad inducida por antígeno aviario. MATERIAL Y MÉTODOS: Se trata de un estudio de casos y controles realizado en el Instituto Nacional de Enfermedades Respiratorias, en la ciudad de México, en el año de 1999. Se estudiaron 109 casos con neumonitis por hipersensibilidad y 184 controles: de éstos, 39, con fibrosis pulmonar idiopática; 63, con tuberculosis pulmonar, y 82, con asma. La ciudad de México y las zonas conurbadas se dividieron en cinco zonas geográficas: centro, noreste, sureste, noroeste y el suroeste. Se calcularon las prevalencias de las diferentes enfermedades por zona urbana de los pacientes que participaron en el estudio; como medida de asociación, se estimó la razón de momios, con un intervalo de confianza al 95%. Asimismo, se realizó regresión logística múltiple ajustando por edad, sexo y estrato socioeconómico. RESULTADOS: Ochenta casos de neumonitis por hipersensibilidad se concentraron en el sur del noreste de las zonas conurbadas y la parte norte del sureste de la ciudad de México, 48 y 32, respectivamente (RM= 3.86, IC 95% 2.17-6.96. Treinta y seis controles de asma se localizaron en el suroeste de la ciudad de México, zona donde se ubica el Intituto Nacional de Enfermedades Respiratorias (p<0.05 y cuatro en la zona conurbada. Los controles de tuberculosis pulmonar y fibrosis pulmonar idiopática estuvieron dispersos en la ciudad de México y en las zonas conurbadas. CONCLUSIONES: La zona sur del noreste y el norte de la sureste están asociadas a la neumonitis por hipersensibilidad. Las causas de esta asociación no parece ser geográfica, pero existe el antecedente de que esa zona fue basurero de la ciudad, por lo que partículas orgánicas en el ambiente pudieran coadyuvar a la aparición de esta enfermedad.

  19. Hydrogen absorption in Mg1.95Ti0.05Ni0.95Cu0.05 alloy prepared with mechanical alloying and thermal treatment; Absorcion de hidrogeno en la aleacion Mg1.95Ti0.05Ni0.95Cu0.05 preparada por aleado mecanico y tratamiento termico

    Energy Technology Data Exchange (ETDEWEB)

    Martinez, Juan Bonifacio; Urena Nunez, Fernando [Instituto Nacional de Investigaciones Nucleares, Ocoyoacac, Estado de Mexico (Mexico)]. E-mail: juan.bonifacio@inin.gob.mx

    2009-09-15

    This work presents hydrogen absorption in quaternary alloy Mg1.95Ti0.05Ni0.95Cu0.05 obtained by the mechanical alloying method, followed by thermal treatment in ultra-high pure argon atmosphere. The composition of the phases, microstructure and morphology of ground powders and with thermal treatment were characterized by DRX, SEM/EDS and TEM. After 20 hours of mechanical grinding and recooked at 300 degrees Celsius/1h in argon atmosphere, the quaternary alloy has a Mg{sub 2}Ni crystalline hexagonal structure with a crystallite size under 10 nm. The absorption measurements were performed under a pressure of 0.2 to 1.2 MPa at a temperature of 200 degrees Celsius in a micro-reactor. The quantification of absorption-desorption of hydrogen in the intermetallic was conducted in a TGA-DSC simultaneous calorimeter. Metallic hydride-dehydride powder was characterized with SEM and XRD. [Spanish] En este trabajo se presenta la absorcion de hidrogeno en la aleacion cuaternaria Mg1.95Ti0.05Ni0.95Cu0.05 obtenida por el metodo de aleado mecanico, seguida de tratamiento termico en atmosfera de argon de ultra alta pureza. La composicion de las fases, microestructura y morfologia de los polvos molidos y con tratamiento termico fue caracterizada por DRX, SEM/EDS y TEM. Despues de 20 h de molienda mecanica con recocido a 300 grados Celsios/1h en atmosfera de argon, la aleacion cuaternaria tiene una estructura cristalina hexagonal Mg{sub 2}Ni con tamano de cristalito menor a 10 nm. Las mediciones de absorcion fueron realizadas bajo una presion de 0.2 a 1.2 MPa a una temperatura de 200 grados Celsios en un micro-reactor. La cuantificacion de absorcion-desorcion de hidrogeno en el intermetalico se realizo en un calorimetro simultaneo TGA-DSC. Se determino que la cantidad maxima absorbida de hidrogeno en la aleacion cuaternaria fue de 3.24% en peso cuando la presion fue de 0.8 MPa a dicha temperatura. Polvos metalicos hidrurados-deshidrurados se caracterizaron por SEM y XRD.

  20. Tritium Labelling by Means of Uranium Hydride; Marquage au Tritium au Moyen d'Hydrure d'Uranium; 0414 0435 0447 ; Marcacion con Tritio por Medio de Hidruro de Uranio

    Energy Technology Data Exchange (ETDEWEB)

    Felter, R. E.; Currie, L. A. [Pennsylvania State University, University Park, PA (United States)

    1962-02-15

    exponiendo la sustancia organica en fase vapor al tritiuro de uranio caliente. En los experimentos realizados con n-pentano y con etileno, se obtienen como principal producto las moleculas originales tritiadas. Las velocidades de incorporacion del tritio oscilaron entre el 0,2 y el 10 por ciento (del tritio inicial) por hora. Los autores han demostrado que la reaccion no se debe a efectos quimicos de las radiaciones, sino que se produce directamente entre los atomos de tritio de la superficie y el hidrocarburo. Ademas de aprovechar rapidamente en la marcacion una parte considerable del tritio presente, el metodo ofrece otra ventaja notable por la facilidad con que por simple enfriamiento del aparato hasta la temperatura ambiente, se puede eliminar de la fase gaseosa el tritio que no haya reaccionado con los vapores del hidrocarburo. (author) [Russian] Rassmatrivaetsja novyj i -jeffektivnyj metod vvedenija tritija v organicheskie molekuly. Mechenie pro- izvoditsja oblucheniem organicheskih parov s pomoshh'ju nagretogo tritidachrana. Pri opytah s n-pentanom i jetilenom glavnymi mechenymi produktami byli tritiro- vannye materinskie molekuly. Stepen pogloshhenija tritija kolebalas' pri- merno ot 0,2 do 10,0% (pervonachal'nogo kolichestva tritija) v chas. Bylo pokazano, chto mehanizm reakcii ne javljaetsja rezul'tatom radiacionnoj himii, a skoree prjamoj reakciej atomov vodoroda s poverhnosti s uglevodoro- dom. Pomimo bystrogo mechenija znachitel'noj ' dolej prisutstvujushhego tritija metod imeet eshhe odno unikal'noe dostoinostvo: tritij, ne vstupivshij v reak- ciju s organicheskim parom, legko ustranjaetsja iz gazovoj fazy prostym ohlazhde- niem reaktivnogo sosuda do komnatnoj temperatury. (author)

  1. Electrochemical study of oxygen reduction reaction in Pt/C catalysts synthesized by photo-deposition; Estudio electroquimico de la reaccion de reduccion de oxigeno en catalizadores de Pt/C sintetizados por fotodeposito

    Energy Technology Data Exchange (ETDEWEB)

    Perez-Galindo, J. A.; Ruiz-Camacho, B.; Valenzuela-Zapata, M. A.; Gonzalez-Huerta, R. G. [IPN, ESIQIE, Mexico, D.F. (Mexico)]. E-mail: rosgonzalez_h@yahoo.com.mx

    2009-09-15

    interaccion entre estos dos componentes ha recibido mucha atencion en los ultimos anos. Esta interaccion es considerada como la responsable en los efectos de crecimiento de la estructura y la disminucion de la dispersion de las particulas del metal sobre el soporte, provocando un bajo desempeno global y un menor tiempo de vida util de la pila. Las propiedades del soporte se ven acentuadas en los catalizadores catodicos, donde se lleva a cabo la reaccion de reduccion de oxigeno por las condiciones de operacion que se tienen, actualmente se estan investigando sintesis que mejoren la interaccion metal-soporte y asi aumentar el tiempo de vida de la pila de combustible. En este trabajo se presenta el estudio electroquimico de catalizadores de tamano nanometrico de platino soportado en carbon (Pt/C) sintetizados por el metodo de Foto-deposito Quimico para determinar su efecto catalitico y estabilidad en la reaccion de reduccion de oxigeno en medio acido. Se utilizo como precursor de platino el C{sub 10}H{sub 14}O{sub 4}Pt (Pt(acac)2). El estudio electroquimico se realizo con las tecnicas de voltamperometria ciclica y electrodo de disco rotatorio observando que los catalizadores sintetizados presentan un comportamiento similar al Pt ETek. El estudio cinetico mostro un potencial a circuito abierto de 0.96 V, con una pendiente de Tafel de 73 mV dec-1 y a una corriente de 0.1 mA cm-2 se tiene un potencial de 0.91 V. Los autores agradecen el apoyo al ICYTDF (proyecto PICS08-37) y al IPN (Proyecto SIP-20090433).

  2. Two-phase characteristics of the feeding fluid of Cerro Prieto IV wells (Mexico) obtained by gas equilibrium; Caracteristicas bifasicas del fluido de alimentacion de pozos de Cerro Prieto IV (Mexico), obtenidas por equilibrio gaseoso

    Energy Technology Data Exchange (ETDEWEB)

    Barragan-Reyes, Rosa Maria; Arellano-Gomez, Victor Manuel; Portugal-Marin, Enrique [Instituto de Investigaciones Electricas (Mexico); De Leon-Vivar, Jesus [Comision Federal de Electricidad, Residencia General de Cerro Prieto, B.C (Mexico)

    2008-10-15

    The gas composition of fluids produced by CP IV geothermal wells from the Cerro Prieto field was studied in order to identify different types of fluids entering the wells by estimating their temperature and excess steam. A method based on the Fischer Tropsch reaction and H2S equilibrium with pyrite-pyrrhotite as mineral buffer (FTHSH3) was used. The results for the reservoir natural state indicated the presence of fluids with heterogeneous reservoir temperature (between 275 and 310 degrees Celsius) and excess steam values, which were found from negative (boiled liquid that has lost steam when flowing to the well) to one (steam phase with zero liquid saturation). The study for individual wells in which boiling processes were identified, showed that through time, the feeding fluids consist of a two-phase mixture with different liquid/steam proportions. Also, the results suggested that a steam phase could occur at CP IV which is added to the feeding fluid, depending on the operation conditions of the wells. The origin of this steam could be the boiling of the deeper liquid due to a pressure drop. [Spanish] Se estudio la composicion gaseosa de los fluidos producidos por pozos geotermicos del sector CP IV del campo de Cerro Prieto para tratar de distinguir aportes de fluidos diferentes mediante la estimacion de su temperatura de yacimiento y del exceso de vapor. Se utilizo un metodo de equilibrio gaseoso basado en la reaccion de Fischer Tropsch y el equilibrio combinado pirita-pirrotita (FT-HSH3). Los resultados obtenidos indican que en el estado inicial del yacimiento existen fluidos que muestran heterogeneidad en los valores de temperatura de yacimiento (entre 275 y 310 grados Celsius), asi como en el exceso de vapor con valores desde negativos (liquido que despues de ebullir ha perdido vapor en su trayecto hacia el pozo) hasta uno (vapor con cero saturacion de liquido). El estudio individual de los pozos con fenomenos de ebullicion muestra que a traves del tiempo

  3. Condutas adotadas por técnicos de enfermagem após ocorrência de erros de medicação Conductas adoptadas por técnicos de enfermería después de ocurrir errores de medicación Conducts adopted by nursing technicians after the occurrence of medication errors

    Directory of Open Access Journals (Sweden)

    Jânia Oliveira Santos

    2010-06-01

    Full Text Available OBJETIVO: Identificar e analisar as condutas adotadas por técnicos de enfermagem após a ocorrência de erros de medicação. MÉTODOS: Estudo descritivo, de abordagem qualitativa, realizado com 23 técnicos de enfermagem de um hospital de ensino de Goiânia-GO. Os dados foram coletados através de entrevistas semi-estruturadas gravadas e analisadas segundo os pressupostos de Bardin. RESULTADOS: Os resultados evidenciaram duas categorias: tomando condutas relacionadas à comunicação do erro (ao médico, à enfermeira, registrando no prontuário e não comunicando o erro e adotando condutas direcionadas ao paciente (observação do paciente, monitorização e minimização das consequências. CONCLUSÃO: Ressalta-se a necessidade de que as instituições de saúde adotem uma cultura de transparência em relação aos erros de medicação, com a criação de políticas e padronizações para notificação, divulgação e fortalecimento de medidas preventivas.OBJETIVO: Identificar y analizar las conductas adoptadas por técnicos de enfermería después de ocurrir errores de medicación. METODOS: Se trata de un estudio descriptivo con abordaje cualitativo, realizado en 23 técnicos de enfermería de un hospital de enseñanza, en la ciudad de Goiania, estado de Goiás. Los datos fueron recolectados a través de entrevistas semiestructuradas grabadas y analizadas según los conceptos de Bardin. RESULTADOS: Los resultados evidenciaron dos categorías: tomando conductas relacionadas a la comunicación del error (al médico, a la enfermera, registrando en la ficha y no comunicando el error y, adoptando conductas dirigidas al paciente (observación del paciente, monitorización y minimización de las consecuencias. CONCLUSIÓN: Se resalta la necesidad de que las instituciones de salud adopten una cultura de transparencia en relación a los errores de medicación, con la creación de políticas y la estandarización de las notificaciones, con la

  4. Uso das diretrizes para tratamento da úlcera por pressão por enfermeiros de um hospital geral

    Directory of Open Access Journals (Sweden)

    Elaine Maria Leite Rangel

    2009-03-01

    Full Text Available Este estudo objetivou identificar a freqüência do uso das diretrizes para o tratamento da úlcera por pressão(UP por enfermeiros de um hospital geral no interior do estado de São Paulo. É transversal de caráterdescritivo com análise quantitativa de dados. Amostra de 25 enfermeiros. Para a coleta de dados utilizou-se uminstrumento, construído a partir das diretrizes para o tratamento da UP. As questões foram relacionadas aostipos de intervenções usadas pelos enfermeiros para o tratamento da UP em estágio I, II, com necrose e comtecido de granulação. Para UP em estágio I, 24 (96% enfermeiros sempre realizavam a mudança de decúbito.Nas úlceras em estágio II a utilização de óleos vegetais na ferida era realizada sempre por 10 (40%enfermeiros e o curativo de hidrocolóide nunca era utilizado por 12 (57,1% enfermeiros. Em UP com necrose alimpeza com povidine era realizada por 4 (17,4% enfermeiros às vezes. Para o desbridamento, 16 (64% àsvezes utilizavam papaína e 15 (71,4% às vezes utilizavam colagenase. Em úlceras com tecido de granulaçãosempre era utilizado o soro fisiológico por 25 (100% enfermeiros. Houve variação nas práticas para otratamento da UP e falta de adesão às diretrizes.

  5. System design description for portable 1,000 CFM exhauster Skids POR-007/Skid E and POR-008/Skid F

    International Nuclear Information System (INIS)

    Nelson, O.D.

    1998-01-01

    The primary purpose of the two 1,000 CFM Exhauster Skids, POR-007-SKID E and POR-008-SKID F, is to provide backup to the waste tank primary ventilation systems for tanks 241-C-106 and 241-AY-102, and the AY-102 annulus in the event of a failure during the sluicing of tank 241-C-106 and subsequent transfer of sluiced waste to 241-AY-102. This redundancy is required since both of the tank ventilation systems have been declared as Safety Class systems

  6. Del significado responsabilidad de los socios en las compañías mercantiles por acciones y por cuotas.

    Directory of Open Access Journals (Sweden)

    Jorge Payome Suárez

    2003-01-01

    Full Text Available El comentario presentado, además de constituir una guía útil para los socios de compañías mercantiles por acciones y por cuotas, en un aspecto de indudable importancia para ellos, cual es el de su eventual responsabilidad, se erige como una herramienta provechosa para estudiantes y profesionales interesados en el tema. La experiencia académica y docente del autor del ensayo aseguran un análisis autorizado de la materia.

  7. La mortalidad por enfermedades del corazón y por reumatismo en la ciudad de bogotá

    OpenAIRE

    Bejarano, Jorge

    2012-01-01

    La alta cifra de mortalidad por enfermedades cardio-vasculares está indicando la urgencia de una campana para contener sus avances. De todas las adquisiciones sanitarias, ninguna ha tenido el alcance y los resultados admirables de los centros o dispensarios destinados al tratamiento de una enfermedad y a la educación del enfermo. Nadie podrá pues, dudar que los dispensarios o consultorios de enfermedades cardio-vasculares, sea una de las armas más eficaces en la lucha contra la mortalidad por...

  8. Signos Vitales de los CDC-Muertes por intoxicación por alcohol (Alcohol Poisoning Deaths)

    Centers for Disease Control (CDC) Podcasts

    2015-01-06

    Este podcast se basa en la edición de enero del 2015 del informe Signos Vitales de los CDC. En los Estados Unidos, mueren en promedio seis personas cada día debido a la intoxicación por alcohol. Infórmese sobre lo que puede hacer para prevenir los atracones de alcohol y las intoxicaciones por alcohol.  Created: 1/6/2015 by National Center for Chronic Disease Prevention and Health Promotion (NCCDPHP).   Date Released: 1/6/2015.

  9. Levantamiento del proceso de registros contables por causación de las cuentas por cobrar a clientes

    OpenAIRE

    Mayele-Rodríguez, Luz

    2013-01-01

    De igual forma el Proyecto de Mejora de Procesos a elaborar, desarrollar e implementar en el Área Administrativa y Financiera del Centro de Pinturas Automotriz “LMS”, es realizar el levantamiento del Proceso de Registros Contables por Causación de las cuentas por cobrar a clientes. Lo anterior se puede desarrollar a partir de un poder de negociación con proveedores que incluye entre otros los siguientes factores : El plazo alcanzado en la negociación de compras de insumos, materias primas, co...

  10. "Efecto del ingreso obtenido por el socio industrial por concepto de alimentos en la sociedad en nombre colectivo"

    OpenAIRE

    Adame Alba, Nayzeth

    2011-01-01

    Hoy en día la excesiva carga tributaria en nuestro país, nos obliga a buscar alternativas factibles y seguras, en el cumplimiento de las obligaciones fiscales, por ello, debemos aprovechar la existencia de figuras jurídicas útiles para la optimización de recursos financieros dentro del marco de ley, es el caso de la sociedad en nombre colectivo, que nos permite la existencia de socios industriales que a su vez, el ingreso que perciben por concepto de alimentos se encuentra exento de impuestos...

  11. La discapacidad entre poblaciones refugiadas y afectadas por conflictos

    OpenAIRE

    Reilly, Rachael

    2010-01-01

    La Comisión de Mujeres Refugiadas lanzó en el año 2007 un importante proyecto de investigación para evaluar la situación de las personas con discapacidad entre las poblaciones desplazadas o afectadas por conflictos.

  12. Rotura neumática de colon por aire comprimido

    OpenAIRE

    VITÓN H,REBECA; QUADROS B,PEDRO; RODRÍGUEZ M,JOSÉ ANTONIO

    2010-01-01

    La ruptura del colon causada por aire comprimido a alta presión es rara. A propósito de un caso se revisan los mecanismos de producción, tipos de roturas, clínica, diagnóstico y tratamiento de estos traumatismos.