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Sample records for experimental iii aspectos

  1. Cómo realizar una comunicación científica. Aspectos tipográficos (III

    Directory of Open Access Journals (Sweden)

    Gutierrez Couto, U

    2005-09-01

    Full Text Available Resumen: El objetivo de este artículo es revisar los principales aspectos tipográficos para facilitar la legibilidad y la facilidad de lectura en la Web de un texto científico escrito.Abstract: The aim of this paper is review main typographical aspects to improve the legibility and readability of a scientific writing in the Web.

  2. Theoretical and experimental spectroscopic studies of the first highly luminescent binuclear hydrocinnamate of Eu(III), Tb(III) and Gd(III) with bidentate 2,2'-bipyridine ligand

    Energy Technology Data Exchange (ETDEWEB)

    Marques, Lippy F.; Correa, Charlane C.; Garcia, Humberto C. [Departamento de Química-ICE, Universidade Federal de Juiz de Fora, Juiz de Fora-MG 36036-330 (Brazil); Martins Francisco, Thiago [Departamento de Física-ICEx, Universidade Federal de Minas Gerais, Pampulha, Belo Horizonte-MG 30123-970 (Brazil); Ribeiro, Sidney J.L. [Instituto de Química, Universidade Estadual Paulista Júlio de Mesquita Filho-UNESP, CP 355, Araraquara-SP 14801-970 (Brazil); Dutra, José Diogo L.; Freire, Ricardo O. [Pople Computational Chemistry Laboratory, Departamento de Química, Universidade Federal de Sergipe, São Cristóvão-SE 49100-000 (Brazil); Machado, Flávia C., E-mail: flavia.machado@ufjf.edu.br [Departamento de Química-ICE, Universidade Federal de Juiz de Fora, Juiz de Fora-MG 36036-330 (Brazil)

    2014-04-15

    In this paper, the synthesis of three new binuclear lanthanide (III) complexes [Ln{sub 2}(cin){sub 6}(bpy){sub 2}] (Ln=Eu (1), Tb (2), Gd (3), cin=hydrocinnamate anion; bpy=2,2'-bipyridine), and their complete characterization, including single crystal X-ray diffraction, FTIR spectroscopy and thermal analysis (TGA/DTA) are reported. In especial, photophysical properties of Eu(III) complex have been studied in detail via both theoretical and experimental approaches. Crystal structures of 1–3 reveal that all compounds are isostructural and that each lanthanide ion is nine-coordinated by oxygen and nitrogen atoms in an overall distorted tricapped trigonal-prismatic geometry. Eu(III) complex structure was also calculated using the Sparkle model for lanthanide complexes and the intensity parameters (Ω{sub 2}, Ω{sub 4}, and Ω{sub 6}), calculated from the experimental data and from Sparkle/PM3 model. The theoretical emission quantum efficiencies obtained for Sparkle/PM3 structures are in excellent agreement with the experimental values, clearly attesting to the efficacy of the theoretical models. The theoretical procedure applied here shows that the europium binuclear compound displays a quantum yield about 65% suggesting that the system can be excellent for the development of efficient luminescent devices. Highlights: • First binuclear Ln{sup 3+}-hydrocinnamate have been synthesized and characterized. • Eu{sup 3+}, Tb{sup 3+} and Gd{sup 3+} complexes photoluminescence properties were investigated. • Theoretical approaches for Eu{sup 3+} complex luminescence has been performed. • An energy level diagram is used to establish the ligand-to-metal energy transfer. • 65% Quantum yield suggests an excellent system for luminescent devices.

  3. Specialist committee's review reports for experimental fast reactor JOYO' MK-III performance tests

    International Nuclear Information System (INIS)

    Yamashita, Kiyonobu; Okubo, Toshiyuki; Kamide, Hideki

    2004-02-01

    Performance tests (startup-physics tests and power elevation tests) were planed for experimental fast reactor 'JOYO' MK-III where irradiation performances were upgraded by power increase from 100 to 140 MW. The reactor safety committee of O-arai Engineering Center has established a specialist committee for 'JOYO' MK-III Performance Tests at the first meeting of 2003 on 23th. April 2003, to accomplish the tests successfully. Subjects of the specialist committee were reviews of following items covering a wide range. 1) Contents of modification works. 2) Reflections of functional test results to the plant and facilities. 3) Reflections of safety rule modification to instruction and manual for operation. 4) Quality assurances and pre-calculation for performance test. 5) Inspection plan and its results. 6) Adequacy of performance test plan. 7) Confirmation of performance test results. Before test-starts, the specialist committee has confirmed by reviewing the items from 1) to 6) based on explanations and documents of the Division of Experimental Reactor, that the test plan and pre-inspections are adequate. After the tests, the specialist committee had confirmed by reviewing the item 7) in the same way, that the each test result satisfies the corresponding criterion. The specialist committee has concluded from these review's results before and after the tests that the 'JOYO' MK-III Performance Tests were carried out appropriately. Besides, the first criticality of the JOYO MK-III was achieved on 2nd. July 2003, and the continuous full power operation was carried on 20th. Nov. 2003. Finally, all performance tests were completed by the pass of the last governmental pre-serviced inspection (dose rate measurement during the shut down condition). (author)

  4. Aspectos que interfieren en la movilidad estudiantil

    Directory of Open Access Journals (Sweden)

    María Mercedes Ramírez-Ordoñez

    2014-12-01

    Full Text Available Objetivo: Identificar los aspectos que interfieren en la realización de movilidad estudiantil. Materiales y Métodos: Esta investigación es cuantitativa de tipo descriptivo transversal por conveniencia, constituida por 243 estudiantes que hacen parte de un programa de enfermería en una institución de educación superior X, de los cuales se entrevistaron a 237. Para la recolección de la información se diseñó un cuestionario donde se evalúa el aspecto económico, académico y familiar y su interferencia con el programa de movilidad de la institución. Para su estructuración se realizó revisión bibliográfica, evaluación de expertos, alfa de cronbach y prueba piloto. Resultados: El aspecto económico ocupa el primer lugar en interferir en la movilidad estudiantil con un 73%, es importante resaltar que la población encuestada pertenece al estrato 2 por lo tanto cuentan con pocos recursos. El segundo lugar fue para el aspecto académico con un 63.45% y en menor dimensión el aspecto familiar con 26%; el 77% manifiesta tener un interés por participar del programa de movilidad, de los cuales el 43.78% prefiere el nivel internacional, el 29,79 % nacional y ambas opciones el 25,95%. Conclusiones: Al relacionar los aspectos económicos, académicos y familiares con el total de la población se encontró que solo el 12% de los estudiantes cumplen la totalidad de estos requisitos y pueden participar de la movilidad estudiantil.

  5. Experimental studies and tests on An(III)/Ln(III) separation using the TODGA extractant

    Energy Technology Data Exchange (ETDEWEB)

    Heres, Xavier; Sorel, Christian; Miguirditchian, Manuel; Cames, Beatrice; Hill, Clement; Bisel, Isabelle; Espinoux, Denis; Viallesoubranne, Carole; Baron, Pascal; Lorrain, Brigitte [CEA/DEN/MAR/DRCP, Marcoule, BP17171, 30207 Bagnols/Ceze (France)

    2009-06-15

    Minor actinide recycling by separation and transmutation is worldwide considered as one of the most promising strategies to reduce the inventory of radioactive waste, thus contributing to make nuclear energy more sustainable. One of the different options investigated at the CEA Marcoule and within the ACSEPT project (a European collaborative project partly funded by the 7. EURATOM Framework Program) to separate trivalent minor actinide (Am(III)-Cf(III)) from the fission and activation products contained in PUREX raffinates is the TODGA process, which consists in: 1. Co-extracting trivalent 4f and 5f elements from highly acidic PUREX raffinates by a mixture of TODGA (tetraoctyl-diglycolamide) and TBP (tributyl-phosphate), dissolved in HTP (hydrogenated tetra-propene). 2. Selectively stripping the trivalent minor actinides by a hydrophilic poly-aminocarboxylic acid used as a complexing agent in a buffered aqueous solution, while the trivalent lanthanides are kept in the organic solvent thanks to a sodium nitrate salting-out effect. 3. Stripping the lanthanides in a diluted nitric acid solution. The major difficulty of this TODGA separation process is to tune the pH in a very narrow range of operating conditions in the second step, because of the high sensitivity of the performances of the flow-sheet vs pH. This difficulty was however overcome. This paper describes the development of the TODGA process from experimental studies to hot test implementation in shielded cells of the ATALANTE facility, including (i) the optimization of the extraction system (both the formulation of the organic solvent and those of the aqueous scrubbing and stripping solutions), (ii) the implementation of a cold test in small scale mixer-settlers in the G1 facility (MARCEL loop), using a surrogate feed composed of major fission products, (iii) the validation of some steps of the process, using a surrogate feed, spiked with Am-241 and Eu-152, and similar laboratory contactors (medium activity

  6. Removal of Cr(III ions from salt solution by nanofiltration: experimental and modelling analysis

    Directory of Open Access Journals (Sweden)

    Kowalik-Klimczak Anna

    2016-09-01

    Full Text Available The aim of this study was experimental and modelling analysis of the nanofiltration process used for the removal of chromium(III ions from salt solution characterized by low pH. The experimental results were interpreted with Donnan and Steric Partitioning Pore (DSP model based on the extended Nernst-Planck equation. In this model, one of the main parameters, describing retention of ions by the membrane, is pore dielectric constant. In this work, it was identified for various process pressures and feed compositions. The obtained results showed the satisfactory agreement between the experimental and modelling data. It means that the DSP model may be helpful for the monitoring of nanofiltration process applied for treatment of chromium tannery wastewater.

  7. Osteossarcoma parosteal: aspectos na radiologia convencional

    OpenAIRE

    Nanci Neto,Francisco; Marchiori,Edson; Vianna,Alberto Domingues; Aymoré,Ierecê Lins; Almeida,Ana Luiza Brito de; Irion,Klaus L.; Collares,Felipe Birchal

    2007-01-01

    OBJETIVO: Avaliar os achados clínicos mais importantes do osteossarcoma parosteal e descrever os seus aspectos mais comuns na radiologia convencional. MATERIAIS E MÉTODOS: Estudo retrospectivo com 26 pacientes com osteossarcoma parosteal, provenientes do arquivo do Clube do Osso, Rio de Janeiro, RJ, e análise dos principais achados clínicos e aspectos radiológicos. RESULTADOS: A doença predominou em pacientes do sexo feminino e teve idade média de acometimento na terceira década de vida. Os a...

  8. Aspectos histopatológicos do útero de ratas utilizadas como modelo experimental de endometrite

    Directory of Open Access Journals (Sweden)

    Liriane Baratella-Evêncio

    2006-12-01

    Full Text Available Os progestágenos constituem-se em importantes reguladores da atividade funcional e estrutural do sistema reprodutor feminino. Em medicina veterinária a prescrição de drogas que atuam neste sistema, como o acetato de medroxiprogesterona, tem diversas finalidades, como servir de instrumento no manejo reprodutivo ou no controle farmacológico do ciclo estral, tratamento de patologias ou limitação e controle da fertilidade. Considerando-se sua importância e sua freqüente utilização, realizamos o presente trabalho que teve por objetivo, estudar a morfologia e morfometria do útero de ratas utilizadas como modelo experimental de endometrite. Para a realização deste estudo foram utilizadas 36 ratas albinas da linhagem wistar, induzidas hormonalmente à endometrite através do tratamento com diferentes doses de acetato de medroxiprogesterona e divididas em 04 grupos: Grupo I (ratas não tratadas com acetato de medroxiprogesterona e avaliadas aos 10, 20 e 30 dias do experimento; Grupos II, III e IV (ratas tratadas com 0,75 mg, 1,5 mg e 4,5 mg de acetato de medroxiprogesterona respectivamente e, avaliadas aos 10, 20 e 30 dias do experimento. De acordo com nossos resultados podemos concluir que o endométrio dos grupos tratados apresentaram-se pouco desenvolvidos. Quanto ao número de glândulas endometriais observou-se uma maior quantidade no Grupo I (controle do que nos grupos II, III e IV (tratados. Estes resultados evidenciam que houve hipotrofia endometrial, metaplasia celular para o tipo cúbico e a formação de projeções papilares no útero de ratas.

  9. Aspectos clínicos, ultra-sonográficos e venográficos da tromboflebite jugular experimental em equinos

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    Carlos Alberto Hussni

    2012-07-01

    Full Text Available A tromboflebite jugular ocorre frequentemente em equinos, decorrendo geralmente de processos mórbidos associados à iatrogenia, podendo levar a perda de função, edema cefálico, diminuição do desempenho atlético e ainda causar o óbito. Esta enfermidade nos equinos apesar de frequente é pouco conhecida quanto à sua evolução e tratamentos. O objetivo deste trabalho foi avaliar a evolução da tromboflebite jugular experimental em equinos, quanto às alterações clínicas e estruturais envolvidas na enfermidade, observando-se os aspectos clínicos, ultra-sonográficos e venográficos no contexto do trombo e do vaso, quanto à possibilidade de recanalização do trombo produzido e da vascularização compensatória. A tromboflebite da veia jugular foi induzida, unilateralmente, em 05 equinos nos quais previamente à indução da tromboflebite e diariamente após foram observadas manifestações clínicas e realizados exames ultra-sonográficos. Venografias foram feitas nos momentos pré-indução, na indução e a cada seis dias após a indução da tromboflebite, verificando-se a recanalização do trombo oclusivo e a presença de vasos na drenagem sanguínea compensatória. Observou-se a ocorrência de edema moderado das regiões parotídea, massetérica e supra-orbitária e discreto edema submandibular que reduziram até o 6º dia, permanecendo apenas discreto aumento parotídeo. O ingurgitamento da jugular cranial a região da indução permaneceu durante todo o período de avaliação. A porção caudal à tromboflebite mostrou ingurgitamento frente ao garrote na entrada do tórax desde o primeiro dia após a indução. Os exames ultra-sonográficos mostraram formação de trombo oclusivo total durante todo o período de observação em 3 animais e o restabelecimento parcial do fluxo na jugular em 2 animais e a presença de vasos colaterais conduzindo o sangue da porção cranial para a porção caudal à obstrução. As venografias

  10. Hacia lenguajes de metamodelado orientados a aspectos

    OpenAIRE

    Reina Quintero, Antonia María; Torres Valderrama, Jesús; Toro Bonilla, Miguel

    2006-01-01

    En este artículo se propone la extensión de los lenguajes de metamodelado con constructores de la orientación a aspectos. Tras justificar brevemente el interés que en la actualidad está teniendo el metamodelado, y sentar las bases necesarias para entender la propuesta, se presenta, a través de ejemplos, la necesidad de extender un lenguaje de metamodelado como Kermeta con conceptos introducidos en el ámbito de la orientación a aspectos

  11. Aspectos biopsicosociales asociados al embarazo adolescente

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    Regina Cogollo Jiménez

    2012-12-01

    Full Text Available Introducción: El embarazo en la adolescencia, es un evento inesperado, sorpresivo. Este artículo establece la importancia de identificar los aspectos biopsicosociales asociados al embarazo adolescente en las embarazadas asistentes al programa de Control Prenatal de una Empresa Social del Estado de nivel 1 en Montería en 2009, para comprender las actitudes y los comportamientos asociados a esta etapa tan temprana. Materiales y Métodos: Es un estudio descriptivo, cuantitativo, de corte transversal. Población y muestra: 30 adolescentes embarazadas asistentes al Programa, el muestreo por conveniencia. Se utilizó la encuesta y la observación directa, previa autorización del Director de la empresa. Resultados: Caracterización de la población: predominó la edad de 15 a 19 años (adolescencia tardía, uniones libres, baja escolaridad debido a la deserción escolar, ingreso económico menor al salario mínimo legal vigente. Aspectos Biológicos: la menarquía a temprana edad (9 a 14 años, y en ella la mitad de los embarazos. La mayoría de los segundos embarazos terminaron en parto, la minoría en cesárea y aborto. La captación para los controles prenatales fue tardía, algunas no cumplieron con las citas programadas. Aspectos Psicológicos: inestabilidad con la pareja al enterarse del embarazo, tuvieron soporte familiar moral y económico, abandonaron sus estudios y presentaron malestares como estrés, depresión y tristeza. Aspectos Sociales: predominó la convivencia con la familia extensa. Hubo aceptación en el colegio y en los amigos. Discusión y Conclusiones: Se plantean estrategias para disminuir estos aspectos: elaboración de una cartilla sobre “Cuidado de la adolescente embarazada”, creación de espacios de reflexión, jornadas lúdicas educativas, entre otros. (Rev Cuid 2012; 3(3:385-93.Palabras clave: Embarazo en Adolescencia, Bienestar Materno, Atención Prenatal. (Fuente: De

  12. A physically-based constitutive model for SA508-III steel: Modeling and experimental verification

    International Nuclear Information System (INIS)

    Dong, Dingqian; Chen, Fei; Cui, Zhenshan

    2015-01-01

    Due to its good toughness and high weldability, SA508-III steel has been widely used in the components manufacturing of reactor pressure vessels (RPV) and steam generators (SG). In this study, the hot deformation behaviors of SA508-III steel are investigated by isothermal hot compression tests with forming temperature of (950–1250)°C and strain rate of (0.001–0.1)s −1 , and the corresponding flow stress curves are obtained. According to the experimental results, quantitative analysis of work hardening and dynamic softening behaviors is presented. The critical stress and critical strain for initiation of dynamic recrystallization are calculated by setting the second derivative of the third order polynomial. Based on the classical stress–dislocation relation and the kinetics of dynamic recrystallization, a two-stage constitutive model is developed to predict the flow stress of SA508-III steel. Comparisons between the predicted and measured flow stress indicate that the established physically-based constitutive model can accurately characterize the hot deformations for the steel. Furthermore, a successful numerical simulation of the industrial upsetting process is carried out by implementing the developed constitutive model into a commercial software, which evidences that the physically-based constitutive model is practical and promising to promote industrial forging process for nuclear components

  13. A physically-based constitutive model for SA508-III steel: Modeling and experimental verification

    Energy Technology Data Exchange (ETDEWEB)

    Dong, Dingqian [National Die & Mold CAD Engineering Research Center, Shanghai Jiao Tong University, 1954 Huashan Rd., Shanghai 200030 (China); Chen, Fei, E-mail: feechn@gmail.com [National Die & Mold CAD Engineering Research Center, Shanghai Jiao Tong University, 1954 Huashan Rd., Shanghai 200030 (China); Department of Mechanical, Materials and Manufacturing Engineering, University of Nottingham, Nottingham NG7 2RD (United Kingdom); Cui, Zhenshan, E-mail: cuizs@sjtu.edu.cn [National Die & Mold CAD Engineering Research Center, Shanghai Jiao Tong University, 1954 Huashan Rd., Shanghai 200030 (China)

    2015-05-14

    Due to its good toughness and high weldability, SA508-III steel has been widely used in the components manufacturing of reactor pressure vessels (RPV) and steam generators (SG). In this study, the hot deformation behaviors of SA508-III steel are investigated by isothermal hot compression tests with forming temperature of (950–1250)°C and strain rate of (0.001–0.1)s{sup −1}, and the corresponding flow stress curves are obtained. According to the experimental results, quantitative analysis of work hardening and dynamic softening behaviors is presented. The critical stress and critical strain for initiation of dynamic recrystallization are calculated by setting the second derivative of the third order polynomial. Based on the classical stress–dislocation relation and the kinetics of dynamic recrystallization, a two-stage constitutive model is developed to predict the flow stress of SA508-III steel. Comparisons between the predicted and measured flow stress indicate that the established physically-based constitutive model can accurately characterize the hot deformations for the steel. Furthermore, a successful numerical simulation of the industrial upsetting process is carried out by implementing the developed constitutive model into a commercial software, which evidences that the physically-based constitutive model is practical and promising to promote industrial forging process for nuclear components.

  14. Temporal development of cross-neutralization between HTLV-III B and HTLV-III RF in experimentally infected chimpanzees

    NARCIS (Netherlands)

    Goudsmit, J.; Thiriart, C.; Smit, L.; Bruck, C.; Gibbs, C. J.

    1988-01-01

    Sera from chimpanzees inoculated respectively with HTLV-III B, LAV, HTLV-III RF and brain tissue from an AIDS patient were analysed for neutralizing activity by two methods: a cell fusion inhibition test (CFI) using HTLV-III B infected cells as inoculum and CD4+ cells as target and a replication

  15. Aspectos gerais do poliestireno

    OpenAIRE

    Montenegro, Ricardo Sá Peixoto; Serfaty, Moysés Elias

    2002-01-01

    O presente trabalho pretende dar uma visão geral e atualizada do poliestireno, o mais antigo termoplástico fabricado comercialmente no mundo. Apresenta-se uma visão simplificada do cenário mundial, da América do Sul e do Brasil, bem como alguns aspectos das tecnologias de fabricação e ambiental. Bibliografia: p. 136

  16. Advanced Experimental Analysis of Controls on Microbial Fe(III) Oxide Reduction - Final Report - 09/16/1996 - 03/16/2001; FINAL

    International Nuclear Information System (INIS)

    Roden, Eric E.

    2001-01-01

    Considering the broad influence that microbial Fe(III) oxide reduction can have on subsurface metal/organic contaminant biogeochemistry, understanding the mechanisms that control this process is critical for predicting the behavior and fate of these contaminants in anaerobic subsurface environments. Knowledge of the factors that influence the rates of growth and activity of Fe(III) oxide-reducing bacteria is critical for predicting (i.e., modeling) the long-term influence of these organisms on the fate of contaminants in the subsurface, and for effectively utilizing Fe(III) oxide reduction and associated geochemical affects for the purpose of subsurface metal/organic contamination bioremediation. This research project will refine existing models for microbiological and geochemical controls on Fe(III) oxide reduction, using laboratory reactor systems that mimic, to varying degrees, the physical and chemical conditions of the subsurface. Novel experimental methods for studying the kinetics of microbial Fe(III) oxide reduction and measuring growth rates of Fe(III) oxide-reducing bacteria will be developed. These new methodologies will be directly applicable to studies on subsurface contaminant transformations directly coupled to or influenced by microbial Fe(III) oxide reduction

  17. Toxicologia do tolueno: aspectos relacionados ao abuso

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    Forster Letícia M.K.

    1994-01-01

    Full Text Available O tolueno está presente em muitos produtos de uso doméstico e industrial e é o principal solvente envolvido no abuso de substâncias e na exposição ocupacional. O problema mais grave no estudo de patologias relacionadas ao tolueno é que este está geralmente associado, em suas preparações comerciais, a outras substâncias. O potencial tóxico do tolueno foi abordado nos seguintes aspectos: parâmetros farmacológicos; características físico-químicas; exposição; estudos clínicos; diagnóstico; pesquisa experimental; tolerância e dependência; efeitos agudos e crônicos; neurotoxicidade; teratogenicidade; doenças psiquiátricas; carcinogenicidade e tratamento. Conclui-se ser de grande importância e urgência que se realizem estudos clínicos com amostras maiores para definição mais precisa das conseqüências do uso crônico

  18. Toxicologia do tolueno: aspectos relacionados ao abuso

    Directory of Open Access Journals (Sweden)

    Letícia M.K. Forster

    1994-04-01

    Full Text Available O tolueno está presente em muitos produtos de uso doméstico e industrial e é o principal solvente envolvido no abuso de substâncias e na exposição ocupacional. O problema mais grave no estudo de patologias relacionadas ao tolueno é que este está geralmente associado, em suas preparações comerciais, a outras substâncias. O potencial tóxico do tolueno foi abordado nos seguintes aspectos: parâmetros farmacológicos; características físico-químicas; exposição; estudos clínicos; diagnóstico; pesquisa experimental; tolerância e dependência; efeitos agudos e crônicos; neurotoxicidade; teratogenicidade; doenças psiquiátricas; carcinogenicidade e tratamento. Conclui-se ser de grande importância e urgência que se realizem estudos clínicos com amostras maiores para definição mais precisa das conseqüências do uso crônico

  19. Study on core flow distribution of the reference core design Mark-III of experimental multi-purpose VHTR

    International Nuclear Information System (INIS)

    Satoh, Sadao; Arai, Taketoshi; Miyamoto, Yoshiaki; Hirano, Mitsumasa

    1977-01-01

    Concerning the coolant flow distribution between fuel channels and other flow paths in the core, designated as Reference Core Mark-III of the Multi-purpose Experimental Very High Temperature Reactor, thermal analysis has been made of the control rods and other steel structures around the core to find the coolant flow rates (bypass flow) necessary to cool them to their safe operating temperatures. Calculations showed that adequate cooling could be achieved in the Mark-III Core by the bypass flow of 8% of the total reactor coolant flow, 4% each for the control-rod channels and for other structures. The thermal and coolant flow design bases, including the assumption of a 10% bypass flow, were thus confirmed to first approximation. (auth.)

  20. Má oclusão Classe III de Angle com discrepância ântero-posterior acentuada Angle Class III malocclusion with severe anteroposterior disharmony

    Directory of Open Access Journals (Sweden)

    Marcos Alan Vieira Bittencourt

    2009-02-01

    Full Text Available A má oclusão Classe III de Angle é caracterizada por uma discrepância dentária ântero-posterior, que pode ou não estar acompanhada por alterações esqueléticas. Em geral, o aspecto facial fica bastante comprometido, sendo justamente esse fator, na maioria das vezes, que motiva o paciente a procurar pelo tratamento. Este caso foi apresentado à Diretoria do Board Brasileiro de Ortodontia e Ortopedia Facial (BBO, representando a categoria 4, ou seja, uma má oclusão com discrepância ântero-posterior acentuada, Classe III, com ANB menor ou igual a -2º, como parte dos requisitos para a obtenção do título de Diplomado pelo BBO.Angle Class III malocclusion is characterized by an anteroposterior dental discrepancy which may or may not be accompanied by skeletal changes. In general, distressed by a significantly compromised facial aspect, patients tend to seek treatment. This case was presented to the Brazilian Board of Orthodontics and Facial Orthopedics (BBO, as representative of Category 4, i.e., a malocclusion with severe anteroposterior discrepancy, Class III, and ANB Angle equal to or smaller than -2º, as part of the requirements for obtaining the BBO Diploma.

  1. QUALIS PERIODIC EVALUATION: ANALYSIS OF QUALIS UPGRADE IN MEDICINE III.

    Science.gov (United States)

    Jukemura, José; Diniz, Márcio Augusto

    2015-01-01

    To evaluate the preliminary results related to journals up-grade that was used by Medicine III, through opportunity offered by Capes to all agency areas programs. Were used area document of Medicine I, II and III, besides other relevant topics available online at Capes site, between 2009 and 2013. The research was focused to answer two questions: 1) the stratification of Qualis is similar in the three areas of medicine? and 2) the evolution of Qualis in Medicine III was higher? Medicine III showed an increase in its Qualis classification and is publishing in journals with higher impact factors, virtually the same as the Medicine I and II. The area showed the strongest growth in recent three-year periods. Avaliar os resultados preliminares sobre a Medicina III do up-grade oportunizado pela Capes para todas as áreas. Foram utilizados os documentos de áreas e os relevantes ao tema disponíveis online no site da Capes entre 2009 e 2013. Procurou-se focar a pesquisa em dois aspectos para responder duas perguntas: 1) a estratificação do Qualis é semelhante nas três áreas da medicina? e 2) a evolução do Qualis da Medicina III foi maior? A Medicina III apresentou evolução em sua classificação Qualis e está publicando em revistas com maior fator de impacto e é praticamente igual ao da Medicina I e II. A área foi a que apresentou maior evolução nestes últimos triênios.

  2. Berkeley Nuclear Laboratories Reactor Physics Mk. III Experimental Programme. Description of facility and programme for 1971

    Energy Technology Data Exchange (ETDEWEB)

    Nunn, R M; Waterson, R H; Young, J D

    1971-01-15

    Reactor physics experiments have been carried out at Berkeley Nuclear Laboratories during the past few years in support of the Civil Advanced Gas-Cooled Reactors (Mk. II) the Generating Board is building. These experiments are part of an overall programme whose objective is to assess the accuracy of the calculational methods used in the design and operation of these reactors. This report provides a description of the facility for the Mk. III experimental programme and the planned programme for 1971.

  3. Presentación del Libro, “Epilepsia. Aspectos Clínicos y Psicosociales”.

    Directory of Open Access Journals (Sweden)

    Carlos Medina Malo

    2006-12-01

    aspectos biológicos. Es excelente porque muestra el equipo que reunió el Dr. Medina, a los integrantes de la Liga contra la Epilepsia, que se ve reflejada en ese aspecto biopsicosocial de la persona con epilepsia.

  4. Atenção à mulher mastectomizada: discutindo os aspectos ônticos e a dimensão ontológica da atuação da enfermeira no Hospital do Câncer III Atención a la mujer mastectomizada: discutiendo los aspectos ónticos y la dimensión ontológica de la actuación de la enfermera en el Hospital del Cáncer III Care to mastectomized woman: discussing ontic aspects and the ontological dimension in nurses performance at a Cancer Hospital

    Directory of Open Access Journals (Sweden)

    Teresa Caldas Camargo

    2003-10-01

    Full Text Available Esta reflexão aborda os aspectos relativos às dimensões ôntica e ontológica, que constituem e, portanto, permeiam o cenário da atuação da enfermeira junto à cliente com câncer de mama, submetida à mastectomia. A análise reflexiva foi desenvolvida considerando tanto a experiência profissional como enfermeira assistencial do Hospital do Câncer III (HC III do Instituto Nacional de Câncer (INCA, como pelo apoio de um referencial teórico filosófico obtido ao cursar o mestrado e o doutorado em Enfermagem. Numa atitude compreensiva e de interpretação fenomenológica, pretende-se refletir sobre as ações assistenciais da enfermeira na rotina do espaço institucional e apontar possibilidades da ação assistencial a partir da dimensão existencial das pessoas envolvidas. Nesse sentido, ênfase é dada à atuação da enfermeira junto à cliente, que não se traduz apenas na aplicação de técnicas científicas, orientações e informações, mas também percebe, compreende e cuida da mulher cidadã em sua singularidade.Esta reflexión discute los aspectos relacionados con las dimensiones óntica y ontológica, que constituyen y por lo tanto forman el escenario de la actuación de la enfermera con la mujer sometida a la mastectomía. El análisis reflexivo fue desarrollado teniendo en cuenta tanto la experiencia profesional como enfermera asistencial del Hospital del Câncer III (HC III, del Instituto Nacional de Cáncer (INCA, como por el apoyo de un referencial teórico filosófico obtenido durante la maestría y el doctorado en enfermería. Con una actitud comprensiva y de interpretación fenomenológica, se intenta reflejar las acciones asistenciales de la enfermera en el espacio institucional y apuntar las posibilidades de la acción asistencial partiendo de la dimensión existencial de las personas comprometidas. Desde este punto de vista, el énfasis está en la actuación de la enfermera con la mujer mastectomizada, la que no

  5. Electrochemical reduction of Eu (III) in propionic media

    International Nuclear Information System (INIS)

    Brotto, M.E.; Rabockai, T.

    1988-01-01

    Some chronopotentiometric studies of Eu (III) electro-reducion in propionic media that suggests the presence of two parallel rections: Eu (III) → Eu (II) and Eu (III) → Eu (II) → Y are presented. Some experimental data, such Eu (III) reducion, electrolysis of solutions and ionic power of the system are discussed. (M.J.C.) [pt

  6. Study of Type III ELMs in JET

    Energy Technology Data Exchange (ETDEWEB)

    Sartori, R [EFDA Close Support Unit, Garching, 2 Boltzmannstrasse, Garching (Germany); Saibene, G [EFDA Close Support Unit, Garching, 2 Boltzmannstrasse, Garching (Germany); Horton, L D [Association Euratom-IPP, MPI fuer Plasmaphysik, 2 Boltzmannstrasse, Garching (Germany); Becoulet, M [Association Euratom-CEA, CE Cadarache, F-13108 St Paul-lez-Durance, CEDEX (France); Budny, R [PPPL, Princeton University, PO Box 451, Princeton, NJ 08543 (United States); Borba, D [Associacao EURATOM/IST, Centro de Fusao Nuclear, 1096 Lisbon, CODEX (Portugal); Chankin, A [Association Euratom-IPP, MPI fuer Plasmaphysik, 2 Boltzmannstrasse, Garching (Germany); Conway, G D [Association Euratom-IPP, MPI fuer Plasmaphysik, 2 Boltzmannstrasse, Garching (Germany); Cordey, G [EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon, OX14 3DB (United Kingdom); McDonald, D [EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon, OX14 3DB (United Kingdom); Guenther, K [EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon, OX14 3DB (United Kingdom); Hellermann, M G von [FOM-Rijnhuizen, Ass. Euratom-FOM, TEC, PO Box 1207, 3430 BE Nieuwegein (Netherlands); Igithkanov, Yu [Max-Planck-Institute for Plasma Physics, Teilinstitut Greifswald, EURATOM Ass., D-17491, Greifswald (Germany); Loarte, A [EFDA Close Support Unit, Garching, 2 Boltzmannstrasse, Garching (Germany); Lomas, P J [EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon, OX14 3DB (United Kingdom); Pogutse, O [EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon, OX14 3DB (United Kingdom); Rapp, J [EFDA Close Support Unit, Culham, Abingdon OX14 3DB (United Kingdom)

    2004-05-01

    This paper presents the results of JET experiments aimed at studying the operational space of plasmas with a Type III ELMy edge, in terms of both local and global plasma parameters. In JET, the Type III ELMy regime has a wide operational space in the pedestal n{sub e} - T{sub e} diagram, and Type III ELMs are observed in standard ELMy H-modes as well as in plasmas with an internal transport barrier (ITB). The transition from an H-mode with Type III ELMs to a steady state Type I ELMy H-mode requires a minimum loss power, P{sub TypeI}. P{sub TypeI} decreases with increasing plasma triangularity. In the pedestal n{sub e} - T{sub e} diagram, the critical pedestal temperature for the transition to Type I ELMs is found to be inversely proportional to the pedestal density (T{sub crit} {proportional_to} 1/n) at a low density. In contrast, at a high density, T{sub crit}, does not depend strongly on density. In the density range where T{sub crit} {proportional_to} 1/n, the critical power required for the transition to Type I ELMs decreases with increasing density. Experimental results are presented suggesting a common mechanism for Type III ELMs at low and high collisionality. A single model for the critical temperature for the transition from Type III to Type I ELMs, based on the resistive interchange instability with magnetic flutter, fits well the density and toroidal field dependence of the JET experimental data. On the other hand, this model fails to describe the variation of the Type III n{sub e} - T{sub e} operational space with isotopic mass and q{sub 95}. Other results are instead suggestive of a different physics for Type III ELMs. At low collisionality, plasma current ramp experiments indicate a role of the edge current in determining the transition from Type III to Type I ELMs, while at high collisionality, a model based on resistive ballooning instability well reproduces, in term of a critical density, the experimentally observed q{sub 95} dependence of the

  7. Optimization of a new polymeric chromium (III) membrane electrode based on methyl violet by using experimental design.

    Science.gov (United States)

    Kazemi, Sayed Yahya; Hamidi, Akram sadat; Asanjarani, Neda; Zolgharnein, Javad

    2010-06-15

    Plackett-Burman and Box-Behnken designs were applied as experimental design strategies to screen and optimize the influence of membrane ingredients on the electrode performance. A new poly(vinyl chloride) membrane sensor for Cr(III) based on methyl violet as an ionophore was planned. The major variables to find a model for achieving the best Nernstian slope as response were: PVC, plasticizers, methyl violet, KpClTPB, pH, conditioning time and internal solution concentration. Plackett-Burman design was used to screen the main factors and Box-Behnken response surface was led to find a model for optimizing the response. The optimized membrane electrode shows a Nernstian slope for chromium (III) ions over a wide linear range from 1.99x10(-6) to 3.16x10(-2)molL(-1) and a slope of 19.5+/-0.1mVdecade(-1) of activity. It would be successfully applied in the pH range from 3.5 to 6.5 with detection limit of 1.77x10(-6)molL(-1) (0.092mgL(-1)). The response time of the sensor is about 8s and the membrane can be used for more than 6 weeks without any deviation. The relative standard deviations (R.S.D.) for six replicate the measurements of 1.0x10(-4) and 1.0x10(-3)molL(-1) of Cr(III) were 3.2 and 3%, respectively. The electrode revealed comparatively good selectivity with respect to many cations including alkali earth, transition and heavy metal ions. The electrode was successfully used as an indicator in the potentiometric titration of Cr(III) with EDTA and was also applied to the direct determination chromium (III) content of spiked water and soil samples.

  8. Separation of valence forms of chromium(III) and chromium(VI) by coprecipitation with iron(III) hydroxide

    International Nuclear Information System (INIS)

    Nazirmadov, B.; Khamidov, B.O.; Egorova, L.A.

    1989-01-01

    The sorption of 9.62·10 -5 M of Cr (III) and Cr (VI) with iron hydroxide in 1 M potassium nitrate and potassium chloride was investigated in relation to the pH of the medium. Experimental data on the sorption of chromium(III) and chromium(VI) with iron(III) hydroxide made it possible to determine the region of practically complete concentration of Cr (III) and Cr (VI) (pH = 3-6.5). The results from spectrophotometric investigations, calculated data on the distribution of the hydroxocationic forms of chromium(III) and the anions of chromium(IV), and their sorption by iron-(III) hydroxide made it possible to characterize the sorbability of the cationic and anionic forms of chromium in various degrees of oxidation. On this basis a method was developed for the separation of chromium(III) and chromium(VI) by coprecipitation on iron(III) hydroxide and their separation from the iron(III) hydroxide support

  9. Human DPP III – Keap1 Interactions: A Combined Experimental And Computational study

    Directory of Open Access Journals (Sweden)

    Mario Gundić

    2016-06-01

    Full Text Available Kelch-like ECH associated protein 1 (Keap1 is a cellular sensor for oxidative stress and a negative regulator of the transcription factor Nrf2. Keap1 and Nrf2 control expression of nearly 500 genes with diverse cytoprotective functions and the Nrf2-Keap1 signaling pathway is a major regulator of cytoprotective responses to oxidative and electrophilic stress. It was found that the metallopeptidase dipeptidyl peptidase III (DPP III contributes to Nrf2 activation by binding to Keap1, probably by binding to the Kelch domain, and thereby influences Nrf2 activity in cancer. We here first determined that the KD of the DPP III-Kelch domain complex is in the submicromolar range. In order to elucidate the molecular details of the DPP III – Kelch interaction we then built models of the complex between human DPP III and the Keap1 Kelch domain and performed coarse-grained and atomistic simulations of the complexes. In the most stable complexes, the ETGE motif in the DPP III flexible loop binds near the central pore of the six-blade β-propeller Kelch domain. According to the preliminary HD exchange experiments DPP III binds to the more unstructured end of Kelch domain. According to the results of MD simulations DPP III binding to the Kelch domain does not influence the overall DPP III structure or the long-range domain fluctuations. We can conclude that DPP III forms the stable complexes with the Keap1 Kelch domain by inserting the flexible loop into the entrance to the central pore of the six blade β-propeller Kelch domain at its more unstructured, N-terminus. This work is licensed under a Creative Commons Attribution 4.0 International License.

  10. Aspectos psicosociales en universitarias embarazadas

    OpenAIRE

    Estupiñán-Aponte, María R.; Rodríguez-Barreto, Lucía

    2009-01-01

    Objetivo Determinar los aspectos psicosociales relacionados con el embarazo en estudiantes universitarias.Metodología A partir de la revisión de archivos y el muestreo intencional, se seleccionaron 68 estudiantes que tuvieron un embarazo adolescente. Mediante relatos de vida y entrevistas en profundidad se analizan las implicaciones del embarazo en la condición personal, familiar y académica.Resultados Durante el primer trimestre de embarazo, se generan crisis y ajustes en la estructura famil...

  11. Vesicular stomatitis virus (indiana 2 serotype as experimental model to study acute encephalitis – morphological features Vírus da estomatite vesicular (sorotipo indiana 2 como modelo experimental para o estudo de encefalite aguda – aspectos morfológicos

    Directory of Open Access Journals (Sweden)

    Florêncio Figueiredo Cavalcanti Neto

    2003-10-01

    Full Text Available The Vesicular Stomatitis Virus (VSV is a Vesiculovirus of the Rhabdoviridae family that infects mammals and causes vesicular lesions similar to those of foot-and-mouth disease. VSV experimental encephalitis can be induced in rodents and the symptoms are similar to those observed in rabies. However, the lesions observed in the animals´ encephalon are different. Inclusion bodies are not observed. There is necrosis, particularly in the region of the olfactory bulb, and, in some cases, ventriculitis. It was observed that the time pattern of VSV dissemination and the morphological aspects of the lesions are similar to those described in literature. The virus seems to be disseminated through the brain ventricles, being multiplied in the ependyma cells and in the neurons, besides using retrograde and anterograde transport. It was noticed that, due to the facility of virus manipulation, this experimental model has been used in innumerable research studies in several fields. If, on the one hand there are plenty of reports on the infection pathogenesis, on the other hand there are many gaps involving, for instance, aspects about virus transmission, recovery of infected animals and participation of glial cells in the acute as well as in the recovery phases.   O vírus da estomatite vesicular (VEV é um Vesiculovírus da família Rhabdoviridae que infecta mamíferos e causa lesões vesiculares semelhantes às observadas na febre aftosa. A encefalite experimental pode ser induzida em roedores e os sintomas são semelhantes aos observados na raiva; entretanto, as lesões observadas no encéfalo dos animais são diferentes. Corpúsculos de inclusão não são observados, há necrose especialmente da região do bulbo olfatório e em alguns casos, ventriculite. Observamos que o padrão temporal de disseminação do VEV e os aspectos morfológicos das lesões são similares aos descritos na literatura. O vírus parece se disseminar através dos ventr

  12. Effect of pH on stability constants of Am(III)- and Cm(III)- humate complexes

    International Nuclear Information System (INIS)

    Samadfam, Mohammad; Jintoku, Takashi; Sato, Seichi; Ohashi, Hiroshi; Mitsugashira, Toshiaki; Hara, Mitsuo; Suzuki, Yoshimitsu

    1999-01-01

    The apparent stability constants of Am(III)- and Cm(III)-humate complexes were determined by dialysis method at ionic strength 0.1 in the pH range from 3.3 to 5.7 under N 2 bubbling. The Am(III) and Cm(III) loadings were about 10 -7 and 10 -10 mol/dm 3 . The concentrations of Am-241 and Cm-242 tracers were measured by α-spectrometry. It was found that the apparent stability constants were almost identical for both the Am(III)-humate and Cm(III)-humate complexes. The apparent stability constants showed a small pH-dependence, increasing from 10 4.6 at pH 3.3 to 10 5.1 at pH 5.7. The ionization of acidic functional groups of humic acid is possibly the primary factor. Above pH 6, the dialysis membrane was no langer permeable to Am(III) and Cm(III) ions and the apparent stability constant could not be experimentally obtained. The apparent stability constants between pH 6 and pH 8.5 were evaluated by considering that both binary metal-humate and ternary metal-hydroxo-humate complexes exist at pHs above 6. It was assumed that mono-hydroxo-humate complex Am(OH)HA and Cm(OH)HA are the major ternary complexes that exist below pH 9. The overall stability constants for Am(III)- and Cm(III)-humate complexes increased from 10 5.7 at pH 6 to 10 7.2 at pH 8. This implies that the formation of metal-hydroxo-humate species is preferred over the formation of hydroxide species. The apparent overall stability constants can be easily incorporated into geochemical modeling of trivalent actinide migration. The results of the present study show that the apparent stability constants determined experimentally at pH≤6 do not represent the complexation properties at higher pHs and the formation of ternary complexes should be considered in speciation calculations of radionuclides at terrestrial environment. (J.P.N.)

  13. Rock Fracture Toughness Study Under Mixed Mode I/III Loading

    Science.gov (United States)

    Aliha, M. R. M.; Bahmani, A.

    2017-07-01

    Fracture growth in underground rock structures occurs under complex stress states, which typically include the in- and out-of-plane sliding deformation of jointed rock masses before catastrophic failure. However, the lack of a comprehensive theoretical and experimental fracture toughness study for rocks under contributions of out-of plane deformations (i.e. mode III) is one of the shortcomings of this field. Therefore, in this research the mixed mode I/III fracture toughness of a typical rock material is investigated experimentally by means of a novel cracked disc specimen subjected to bend loading. It was shown that the specimen can provide full combinations of modes I and III and consequently a complete set of mixed mode I/III fracture toughness data were determined for the tested marble rock. By moving from pure mode I towards pure mode III, fracture load was increased; however, the corresponding fracture toughness value became smaller. The obtained experimental fracture toughness results were finally predicted using theoretical and empirical fracture models.

  14. Fatigue crack growth in mixed mode I+III+III non proportional loading conditions in a 316 stainless steel, experimental analysis and modelization of the effects of crack tip plasticity

    International Nuclear Information System (INIS)

    Fremy, F.

    2012-01-01

    This thesis deals with fatigue crack growth in non-proportional variable amplitude mixed mode I + II + III loading conditions and analyses the effects of internal stresses stemming from the confinement of the plastic zone in small scale yielding conditions. The tests showed that there are antagonistic long-distance and short-distance effects of the loading history on fatigue crack growth. The shape of loading path, and not only the maximum and minimum values in this path, is crucial and, by comparison, the effects of contact and friction are of lesser importance. Internal stresses play a major role on the fatigue crack growth rate and on the crack path. An approach was developed to analyze the elastic-plastic behavior of a representative section of the crack front using the FEA. A model reduction technic is used to extract the relevant information from the FE results. To do so, the velocity field is partitioned into mode I, II, III elastic and plastic components, each component being characterized by an intensity factor and a fixed spatial distribution. The calculations were used to select seven loading paths in I + II and I + II + III mixed mode conditions, which all have the same amplitudes for each mode, the same maximum, minimum and average values. These paths are supposed to be equivalent in the sense of common failure criteria, but differ significantly when the elastic-plastic behavior of the material is accounted for. The results of finite element simulations and of simulations using a simplified model proposed in this thesis are both in agreement with experimental results. The approach was also used to discuss the role of mode III loading steps. Since the material behavior is nonlinear, the nominal loading direction does not coincide with the plastic flow direction. Adding a mode III loading step in a mode I+II fatigue cycle, may, in some cases, significantly modify the behaviour of the crack (crack growth rate, crack path and plastic flow). (author)

  15. Complexation of trivalent actinides and lanthanides with hydrophilic N-donor ligands for Am(III)/Cm(III) and An(III)/Ln(III) separation; Komplexierung von trivalenten Actiniden und Lanthaniden mit hydrophilen N-Donorliganden zur Am(III)/Cm(III)- bzw. An(III)/Ln(III)-Trennung

    Energy Technology Data Exchange (ETDEWEB)

    Wagner, Christoph

    2017-07-24

    the decadentate Am(III) selective complexing agent H{sub 4}TPAEN (N,N,N{sup '}N{sup '}-tetrakis[(6-carboxypyridin-2-yl)methyl]ethylenediamine) were investigated using TRLFS. The conditional stability constants of these complexes differ by 1.9 orders of magnitude. This is in excellent agreement with the separation factor derived from solvent extraction (SF{sub Eu(III)/Cm(III)} ∼ 100). The complexation of M(III) with H{sub 4}TPAEN is driven by the high positive reaction entropy. PTD (2,6-bis[1-(propan-1-ol)-1,2,3-triazol-4-yl]pyridine) is a charge neutral, CHON compatible complexing agent designed for the selective complexation of An(III). 1:1, 1:2 and 1:3 complexes with Cm(III) and Eu(III) were characterized in aqueous solution at pH 3 and in 0.44 mol/L HNO{sub 3}. The difference of Δlogβ{sub 3} = 4 for the Cm(III) complexes in the different media is primarily caused by the protonation of PTD. Ionic strength effects and the concurring complexation of Cm(III) by nitrate contribute to a lesser extent. In solvent extraction lower separation factors were observed than calculated from the difference of the logβ{sub 3} values of Cm(III) and Eu(III) (SF(experimental){sub Eu(III)/Cm(III)} ∼ 200 vs. SF(calculated){sub Eu(III)/Cm(III)} ∼ 1000). This was proven to be caused by the presence of lower coordinated species during solvent extraction. The {sup 5}D{sub 0} → {sup 7}F{sub 0} transition of more than 20 Eu(III)-BT(B)P/BTPhen complexes was studied. A correlation between the shift of the {sup 7}F{sub 0} emission band and the number of coordinating N-donors was established, allowing to easily identify the stoichiometry of Eu(III) N-donor complexes. Furthermore, the strong nephelauxetic effect observed is an excellent proof of a covalent share in the Eu(III)-N-donor bond.

  16. Aspectos subjetivos relacionados con la violencia intrafamiliar. Caso municipio de Sabaneta Antioquia

    Directory of Open Access Journals (Sweden)

    Naidalis Yadira Martínez

    2016-01-01

    Full Text Available El artículo identifica las interacciones en aspectos familiares y subjetivos. En el artículo se desarrollan los aspectos subjetivos de las dinámicas familiares que justifican el uso y la implementación de la violencia intrafamiliar, se da cuenta de la naturalización de la violencia intrafamiliar en la interacción de los grupos familiares, convirtiéndola en un elemento de la relación que se establece entre los miembros de la familia. En el análisis realizado se identifican aspectos coyunturales asociados a situaciones que se vivieron en la dinámica de la familia de origen, pero que al momento han sido pocas las condiciones que permiten la modi- ficación de estas conductas ya que las familias han asumido estas expresiones de violencia intrafamiliar como parte de sus vidas.

  17. Exploración de repositorios de software y análisis de potenciales extensiones a aspectos

    Directory of Open Access Journals (Sweden)

    Graciela Beatriz Vidal

    2014-06-01

    Full Text Available Tanto el Desarrollo basado en Componentes como el Desarrollo de Software orientado a Aspectos son enfoque propuestos para abordar diversos problemas que surgen en el proceso de desarrollo de aplicaciones. Ambos enfoques tienen como objetivo el reuso de software, ante esta situación surge la necesidad de que componentes y aspectos compartan un espacio común en el cual puedan ser publicados, recuperados y reutilizados. Los repositorios actuales parecen no proveer aspectos de manera explícita, en ocasiones los aspectos son utilizados para especificar el componente, pero no son reusables. La tarea de publicar y recuperar componentes es muy compleja, existen diversos métodos de publicación y recuperación a tal fin. En este trabajo se exploraron diferentes repositorios analizando criterios al igual que se exponen los métodos de publicación y recuperación con el fin de determinar si es posible la adaptación o extensión de los repositorios a aspectos.

  18. Ethanol mediated As(III) adsorption onto Zn-loaded pinecone biochar: Experimental investigation, modeling, and optimization using hybrid artificial neural network-genetic algorithm approach.

    Science.gov (United States)

    Zafar, Mohd; Van Vinh, N; Behera, Shishir Kumar; Park, Hung-Suck

    2017-04-01

    Organic matters (OMs) and their oxidization products often influence the fate and transport of heavy metals in the subsurface aqueous systems through interaction with the mineral surfaces. This study investigates the ethanol (EtOH)-mediated As(III) adsorption onto Zn-loaded pinecone (PC) biochar through batch experiments conducted under Box-Behnken design. The effect of EtOH on As(III) adsorption mechanism was quantitatively elucidated by fitting the experimental data using artificial neural network and quadratic modeling approaches. The quadratic model could describe the limiting nature of EtOH and pH on As(III) adsorption, whereas neural network revealed the stronger influence of EtOH (64.5%) followed by pH (20.75%) and As(III) concentration (14.75%) on the adsorption phenomena. Besides, the interaction among process variables indicated that EtOH enhances As(III) adsorption over a pH range of 2 to 7, possibly due to facilitation of ligand-metal(Zn) binding complexation mechanism. Eventually, hybrid response surface model-genetic algorithm (RSM-GA) approach predicted a better optimal solution than RSM, i.e., the adsorptive removal of As(III) (10.47μg/g) is facilitated at 30.22mg C/L of EtOH with initial As(III) concentration of 196.77μg/L at pH5.8. The implication of this investigation might help in understanding the application of biochar for removal of various As(III) species in the presence of OM. Copyright © 2016. Published by Elsevier B.V.

  19. A binuclear Fe(III)Dy(III) single molecule magnet. Quantum effects and models.

    Science.gov (United States)

    Ferbinteanu, Marilena; Kajiwara, Takashi; Choi, Kwang-Yong; Nojiri, Hiroyuki; Nakamoto, Akio; Kojima, Norimichi; Cimpoesu, Fanica; Fujimura, Yuichi; Takaishi, Shinya; Yamashita, Masahiro

    2006-07-19

    The binuclear [FeIII(bpca)(mu-bpca)Dy(NO3)4], having Single Molecule Magnet (SMM) properties, belonging to a series of isostructural FeIIILnIII complexes (Ln = Eu, Gd, Tb, Dy, Ho) and closely related FeIILnIII chain structures, was characterized in concise experimental and theoretical respects. The low temperature magnetization data showed hysteresis and tunneling. The anomalous temperature dependence of Mössbauer spectra is related to the onset of magnetic order, consistent with the magnetization relaxation time scale resulting from AC susceptibility measurements. The advanced ab initio calculations (CASSCF and spin-orbit) revealed the interplay of ligand field, spin-orbit, and exchange effects and probed the effective Ising nature of the lowest states, involved in the SMM and tunneling effects.

  20. O exercício físico e os aspectos psicobiológicos El ejercicio físico y los aspectos psicobiológicos Physical exercise and the psychobiological aspects

    Directory of Open Access Journals (Sweden)

    Marco Túlio de Mello

    2005-06-01

    Full Text Available O objetivo desta revisão é trazer parte dos estudos sobre um assunto pouco explorado: a relação entre o exercício físico e os aspectos psicobiológicos. A importância da compreensão desses aspectos e como eles afetam a qualidade de vida do ser humano é o que estimula as pesquisas sobre esse assunto. A literatura destaca que a prática regular de exercício físico traz resultados positivos não somente ao sono e aos seus possíveis distúrbios, mas também aos aspectos psicológicos e aos transtornos de humor, como a ansiedade e a depressão, e aos aspectos cognitivos, como a memória e a aprendizagem. Contudo, há indivíduos que se envolvem na prática de exercícios físicos com tal intensidade e/ou freqüência ou, ainda, fazem uso de drogas ilícitas que podem trazer prejuízos à saúde, como, por exemplo, o dependente de exercício físico e o usuário de esteróides anabolizantes. O exercício físico provoca alterações fisiológicas, bioquímicas e psicológicas, portanto, pode ser considerado uma intervenção não-medicamentosa para o tratamento de distúrbios relacionados aos aspectos psicobiológicos.El objetivo de esta revisión es trazer parte de los estudios sobre un asunto poco explorado: la relación ejercicio físico y los aspectos psicobiológicos. La importancia de la comprensión de estos aspectos y como ellos afectan la calidad de vida del ser humano és lo que estimula las pesquisas sobre este asunto. La literatura destaca que la práctica regular del ejercicio físico trae resultados positivos no solamente al sueño y a los posibles distúrbios, más también a los aspectos psicológicos y los trastornos del humor, como la ansiedad y la depresión, y los aspectos cognitivos, como la memoria y el aprendizaje. Con todo hay individuos que se envuelven en la práctica de ejercícios físicos con tal intensidad y / o frecuencia o, donde, hacen usos de drogas ilícitas que pueden traer perjuicios a la salud, como

  1. Room-temperature ballistic transport in III-nitride heterostructures.

    Science.gov (United States)

    Matioli, Elison; Palacios, Tomás

    2015-02-11

    Room-temperature (RT) ballistic transport of electrons is experimentally observed and theoretically investigated in III-nitrides. This has been largely investigated at low temperatures in low band gap III-V materials due to their high electron mobilities. However, their application to RT ballistic devices is limited by their low optical phonon energies, close to KT at 300 K. In addition, the short electron mean-free-path at RT requires nanoscale devices for which surface effects are a limitation in these materials. We explore the unique properties of wide band-gap III-nitride semiconductors to demonstrate RT ballistic devices. A theoretical model is proposed to corroborate experimentally their optical phonon energy of 92 meV, which is ∼4× larger than in other III-V semiconductors. This allows RT ballistic devices operating at larger voltages and currents. An additional model is described to determine experimentally a characteristic dimension for ballistic transport of 188 nm. Another remarkable property is their short carrier depletion at device sidewalls, down to 13 nm, which allows top-down nanofabrication of very narrow ballistic devices. These results open a wealth of new systems and basic transport studies possible at RT.

  2. Predicting Efficient Antenna Ligands for Tb(III) Emission

    Energy Technology Data Exchange (ETDEWEB)

    Samuel, Amanda P.S.; Xu, Jide; Raymond, Kenneth

    2008-10-06

    A series of highly luminescent Tb(III) complexes of para-substituted 2-hydroxyisophthalamide ligands (5LI-IAM-X) has been prepared (X = H, CH{sub 3}, (C=O)NHCH{sub 3}, SO{sub 3}{sup -}, NO{sub 2}, OCH{sub 3}, F, Cl, Br) to probe the effect of substituting the isophthalamide ring on ligand and Tb(III) emission in order to establish a method for predicting the effects of chromophore modification on Tb(III) luminescence. The energies of the ligand singlet and triplet excited states are found to increase linearly with the {pi}-withdrawing ability of the substituent. The experimental results are supported by time-dependent density functional theory (TD-DFT) calculations performed on model systems, which predict ligand singlet and triplet energies within {approx}5% of the experimental values. The quantum yield ({Phi}) values of the Tb(III) complex increases with the triplet energy of the ligand, which is in part due to the decreased non-radiative deactivation caused by thermal repopulation of the triplet. Together, the experimental and theoretical results serve as a predictive tool that can be used to guide the synthesis of ligands used to sensitize lanthanide luminescence.

  3. Criptococose pulmonar: aspectos na tomografia computadorizada

    Directory of Open Access Journals (Sweden)

    Silva Ana Carina Gamboa da

    2003-01-01

    Full Text Available A criptococose pulmonar é uma doença causada pelo Criptococcus neoformans, um fungo unimórfico que possui distribuição mundial, existindo na mesma forma tanto no seu habitat natural quanto em animais e humanos. A doença possui apresentações clínica e patológica variáveis e pode manifestar-se tanto em pacientes com a imunidade normal como em imunocomprometidos, que representam a maioria dos casos. Neste trabalho são analisados os aspectos encontrados nas tomografias computadorizadas do tórax de 14 pacientes com criptococose pulmonar confirmada. Os achados mais freqüentes na tomografia do tórax foram as massas e os nódulos pulmonares. Outros aspectos observados foram as áreas de escavação, as consolidações, o espessamento do interstício peribroncovascular e o reticulado difuso. Massa pulmonar foi o achado isolado mais comum (64,2%, seguido dos nódulos isolados ou múltiplos (35,7%. Doença pulmonar difusa foi vista em apenas 14,2% dos casos. Os lobos superiores foram os mais comprometidos, sendo a doença mais comum nas regiões anteriores. A tomografia do tórax permitiu avaliar com precisão o grau de comprometimento do parênquima pulmonar.

  4. Modelling Eu(III) speciation in a Eu(III)/PAHA/α-Al2O3 ternary system

    International Nuclear Information System (INIS)

    Janot, Noemie; Reiller, Pascal E.; Benedetti, Marc F.

    2013-01-01

    In this work, modelling of Eu(III) speciation in a ternary system, i.e., in presence of purified Aldrich humic acid (PAHA) and α-Al 2 O 3 , is presented. First, the mineral surface charge is measured by potentiometric titrations and then described using the CD-MUSIC model. This model is also used to describe Eu(III) binding to the α-Al 2 O 3 surface at different pH values, ionic strength and mineral concentrations. Time resolved luminescence spectroscopy (TRLS) is then used to study the binding of Eu(III) to PAHA at pH 4 with different humic acid concentrations. The spectra are used to calculate a spectroscopic 'titration curve', used to determine Eu(III)/PAHA binding parameters in the NICA-Donnan model. Following a previous study (Janot et al., Water Res. 46, 731-740), modelling of the ternary system is based upon the definition of two PAHA pools where one fraction remains in solution and the other is adsorbed onto the mineral surface, with each possessing different proton and metal binding parameters. The modification of protonation behaviour for both fractions is examined using spectrophotometric titrations of the non adsorbed PAHA fraction at different organic/mineral ratios. These data are then used to describe Eu(III) interactions in the ternary system: Eu(III) re-partitioning in the ternary system is calculated for different pH, ionic strength and PAHA concentrations, and results are compared to experimental observations. The model is in good agreement with experimental data, except at high PAHA fractionation rates. Results show that organic complexation dominates over a large pH range, with the predominant species existing as the surface-bound fraction. Above pH 8, Eu(III) seems to be mostly complexed to the mineral surface, which is in agreement with previous spectroscopic observations (Janot et al., Environ. Sci. Technol. 45, 3224-3230). (authors)

  5. Contenedores: Aspectos tecnicos, biologicos y economicos

    Science.gov (United States)

    Tara Luna; Thomas D. Landis; R. Kasten Dumroese

    2012-01-01

    La elección del contenedor es una de las consideraciones más importantes al establecer un nuevo vivero o empezar a producir una especie nueva. El tipo y tamaño de contenedor no sólo determina la cantidad de agua y nutrientes minerales que están disponibles para el crecimiento de una planta, sino que también afecta otros aspectos operativos del vivero, como el tamaño de...

  6. Meningites bacterianas no lactente aspectos neurológicos

    Directory of Open Access Journals (Sweden)

    M. Valeriana L. de Moura-Ribeiro

    1990-06-01

    Full Text Available Aspectos clínicos, neurológicos e laboratoriais das meningites bacterianas agudas no lactente são criticamente analisados em função da experiência da autora. São apresentadas considerações fisiopatológicas sobre os eventos que ocorrem na fase aguda desses processos.

  7. ASPECTOS NORTEADORES NA ORIENTAÇÃO DE MONOGRAFIA A DISTÂNCIA

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    monica seixas mello

    2012-12-01

    Full Text Available O objetivo do presente estudo é analisar os aspectos norteadores na orientação de monografia na modalidade a distância a partir de relato de experiência em curso de pó-graduação Lato Sensu em Gestão Pública., constatando-se que na orientação a distância em ambientes virtuais de aprendizagem as interações entre professor e aluno observam os seguintes aspectos: pedagógico, gerencial, social e técnico Palavras-chaves: educação, distância, orientação, monografia, pos-graduação.

  8. CMPO-calix[4]arenes and the influence of structural modifications on the Eu(III), Am(III), Cm(III) separation

    International Nuclear Information System (INIS)

    Peters, C.; Braekers, D.; Desreux, J.F.; Kasyan, O.; Miroshnichenko, S.; Rudzevich, V.; Boehmer, V.

    2008-01-01

    The syntheses of new calix[4]arenes featuring CMPO groups on the wide rim are reported and the extraction of Am(III) and Eu(III) from concentrated HNO 3 aqueous phases are discussed with reference to the properties of the symmetric tetra-CMPO derivative 1. All extraction studies were conducted in the same experimental conditions which allows to directly compare the dependence of the distribution coefficients of various calixarenes on the acid concentration (0.1 M 3 ] < 5 M). Calix[4]arene 1 becomes a very poor extractant if the length of the aliphatic chain between the amide and phosphine oxide groups of CMPO is increased, if the bridging methylene groups are replaced by sulfur atoms or if the macrocyclic cavity size is increased. By contrast, mixed amide - CMPO calix[4]arenes are nearly as effective than 1. Moreover, Am(III)/Cm(III) separation coefficients between 1.5 and 3 have been obtained with unsymmetrical calix[4]arenes of type 1 with different aliphatic chains grafted on the narrow rim. Guidelines to anticipate the extraction ability of calix[4]arenes remain elusive because of the intricate solution behavior of these compounds. (orig.)

  9. Aspectos sociotécnicos das TI & Relacionamento Humano & Sinergia

    Directory of Open Access Journals (Sweden)

    Sergio Vieira Holtz Filho

    2008-06-01

    Full Text Available As Tecnologias de Informação (TI estão entre os principais agentes de mudança sociais. Para gerir tais mudanças, uma miríade de áreas do conhecimento humano têm muito a contribuir para a abordagem dos aspectos sociotécnicos das TI e promover sinergia. Como uma organização empresarial atua no sentido de provocar mudanças no comportamento das pessoas, visando a melhoria contínua, esse processo de mudança provocada chama-se aprendizagem. Isto posto, neste artigo apresentaremos resultados observados em empresas em processo de reengenharia e submetidas a utilização de metodologias integradas (PDCA, Método Paulo Freire e Roteiro Integração de Equipes, abordando os aspectos sociotécnicos das TI & relacionamentos humanos pela praxe da pedagogia como elemento de sinergia.

  10. La gestión por procesos, su surgimiento y aspectos teóricos

    Directory of Open Access Journals (Sweden)

    Daysi Ruiz - Fuentes

    2013-01-01

    Full Text Available Abordó aspectos históricos y teóricos relacionados con la gestión por procesos, se precisa las potencialidades de su aplicación para el perfeccionamiento de la dirección de las empresas. Presentó un análisis de diferentes definiciones de este término a partir del c ual se determinan las regularidades que lo caracterizan. Se puntualizan algunos aspectos teóricos vinculados con esta forma de gestión empresarial.

  11. La gestión por procesos, su surgimiento y aspectos teóricos

    OpenAIRE

    Daysi Ruiz-Fuentes; Rosa Mercedes Almaguer-Torres; Isabel Cristina Torres-Torres; Alejandro Miguel Hernández-Peña

    2014-01-01

    Abordó aspectos históricos y teóricos relacionados con la gestión por procesos, se precisa las potencialidades de su aplicación para el perfeccionamiento de la dirección de las empresas. Presentó un análisis de diferentes definiciones de este término a partir del c ual se determinan las regularidades que lo caracterizan. Se puntualizan algunos aspectos teóricos vinculados con esta forma de gestión empresarial.

  12. Nitrato-complexes of Y(III), La(III), Ce(III), Pr(III), Nd(III), Sm(III), Gd(III), Tb(III), Dy(III) and Ho(III) with 2-(2'-pyridyl) benzimidazole

    Energy Technology Data Exchange (ETDEWEB)

    Mishra, A; Singh, M P; Singh, V K

    1982-05-01

    The nitrato-complexes, (Y(PyBzH)/sub 2/(NO/sub 3/)/sub 2/)NO/sub 3/.H/sub 2/O and Nd, Sm, Gd, Tb, Dy, Ho ; n=1-3, m=0-0.5 ; PyBzh=2-(2 -pyridyl)benzimidazole) are formed on interaction of the ligand with metal nitrates in ethanol. The electrical conductance values (116-129 ohm/sup -1/cm/sup 2/mol/sup -1/) suggest 1:1 electrolyte-nature of the complexes. Magnetic moment values of Ce(2.53 B.M.), Pr(3.62 B.M.), Nd(3.52 B.M.), Sm(1.70 B.M.), Gd(8.06 B.M.), Tb(9.44 B.M.), Dy(10.56 B.M.) and Ho(10.51 B.M.) in the complexes confirm the positive state of the metals. Infrared evidences are obtained for the existance of both coordinated (C/sub 2/v) and uncoordinated (D/sub 3/h) nitrate groups. Electronic absorption spectra of Pr(III)-, Nd(III)-, Sm(III)-, Tb(III)-, Dy(III)- and Ho(III)-complexes have been analysed in the light of LSJ terms.

  13. Nitrato-complexes of Y(III), La(III), Ce(III), Pr(III), Nd(III), Sm(III), Gd(III), Tb(III), Dy(III) and Ho(III) with 2-(2'-pyridyl) benzimidazole

    International Nuclear Information System (INIS)

    Mishra, A.; Singh, M.P.; Singh, V.K.

    1982-01-01

    The nitrato-complexes, [Y(PyBzH) 2 (NO 3 ) 2 ]NO 3 .H 2 O and Nd, Sm, Gd, Tb, Dy, Ho ; n=1-3, m=0-0.5 ; PyBzh=2-(2 -pyridyl)benzimidazole] are formed on interaction of the ligand with metal nitrates in ethanol. The electrical conductance values (116-129 ohm -1 cm 2 mol -1 ) suggest 1:1 electrolyte-nature of the complexes. Magnetic moment values of Ce(2.53 B.M.), Pr(3.62 B.M.), Nd(3.52 B.M.), Sm(1.70 B.M.), Gd(8.06 B.M.), Tb(9.44 B.M.), Dy(10.56 B.M.) and Ho(10.51 B.M.) in the complexes confirm the terpositive state of the metals. Infrared evidences are obtained for the existance of both coordinated (C 2 v) and uncoordinated (D 3 h) nitrate groups. Electronic absorption spectra of Pr(III)-, Nd(III)-, Sm(III)-, Tb(III)-, Dy(III)- and Ho(III)-complexes have been analysed in the light of LSJ terms. (author)

  14. Sb(III)-Imprinted Organic-Inorganic Hybrid Sorbent Prepared by Hydrothermal-Assisted Surface Imprinting Technique for Selective Adsorption of Sb(III)

    Science.gov (United States)

    Zhang, Dan; Zhao, Yue; Xu, Hong-Bo

    2018-03-01

    Sb(III)-imprinted organic-inorganic hybrid sorbent was prepared by hydrothermal-assisted surface imprinting technique and was characterized by Fourier transform infrared spectroscopy, scanning electron microscopy coupled to an energy dispersive spectrometer and N2 adsorption/desorption isotherms. Hydrothermal-assisted process can improve the selectivity of the Sb(III)-imprinted hybrid sorbent for Sb(III) due to stable control of temperature and pressure. The Sb(III)-imprinted hybrid sorbent IIS indicated higher selectivity for Sb(III), had high static adsorption capacity of 37.3 mg g-1 for Sb(III), displayed stable adsorption capacity in pH range from 4 to 8, reached an rapid adsorption equilibrium within 30 min. According to the correlation coefficient ( r 2 > 0.99), the experimental data fitted better the pseudo-second-order kinetic model and Langmuir equilibrium isotherm.

  15. Aspectos nutricionales de la anorexia nerviosa

    OpenAIRE

    Delgado Santirso, Pablo

    2017-01-01

    El estudio que se presentará en las siguientes líneas pretende la actualización de los datos sobre los aspectos nutricionales de uno de los principales Trastornos de la Conducta Alimentaria (TCA), la Anorexia Nerviosa (AN), así como aportar información acerca de sus características generales, etiopatogenia, evaluación y diagnóstico y tratamiento. Se centrará fundamentalmente en las medidas higiénico-dietéticas necesarias del tratamiento nutricional y en el establecimiento de la función del di...

  16. Estilo de vida materno e aspectos nutricionais do pré-escolar

    OpenAIRE

    Érica Bezerra Nobre

    2016-01-01

    INTRODUÇÃO: Muitos dos comportamentos de saúde envolvidos no aparecimento das doenças crônicas não comunicáveis são originados na infância sob influência dos pais. A mãe é a pessoa mais envolvida na educação e nos cuidados de saúde da criança. O estilo de vida (EdV) é um determinante social da saúde. Nunca se compreendeu características de EdV materno associadas com aspectos da nutrição infantil. OBJETIVO: Verificar a associação dos EdV materno comportamental e não comportamental com aspectos...

  17. Aspectos prosódicos da fala de sujeitos parkinsonianos

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    Lourenço Chacon

    2001-02-01

    Full Text Available

    Problemas de prosódia na fala de parkinsonianos têm sido apontados nos estudos sobre parkinsonismo. Contudo, nesses estudos a prosódia é freqüentemente desvinculada dos fatores comunicativos da fala. O propósito deste artigo foi investigar fatores comunicativos relacionados a aspectos prosódicos da fala de sujeitos com doença de Parkinson. As amostras 'de fala foram extraídas de conversas espontâneas de dois sujeitos parkinsonianos, do sexo masculino. A análise mostrou que os elementos prosódicos ocorreram em diversas combinações, possibilitando a identificação de: a atos de fala; b alguns aspectos da organização conversacional; e c diferentes vozes no discurso. Foram destacadas algumas implicações desses resultados para uma melhor compreensão da atividade verbal em condições patológicas, bem como para avaliação, diagnóstico e terapia de parkinsonianos.

  18. Aspectos ergonômicos e estatísticos no projeto de um carro do metrô

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    Costa Neto Pedro Luiz de Oliveira

    2002-01-01

    Full Text Available Este artigo descreve experimentos realizados como parte de um trabalho envolvendo aspectos do projeto de um carro para uma nova linha do Metrô de São Paulo. Nele são considerados aspectos ergonômicos relacionados com a posição de barras de segurança e assentos, bem como aspectos estatísticos relacionados com o fluxo de passageiros entrando e saindo do carro na estação. Nesse estudo, é de particular interesse o uso da técnica do quadrado latino na análise de regressão múltipla, como forma de reduzir o porte do experimento.

  19. Synthesis, characterization and stability of Cr(III) and Fe(III) hydroxides

    International Nuclear Information System (INIS)

    Papassiopi, N.; Vaxevanidou, K.; Christou, C.; Karagianni, E.; Antipas, G.S.E.

    2014-01-01

    Highlights: • Fe(III)–Cr(III) hydroxides enhance groundwater quality better than pure Cr(III) compounds. • Crystalline Cr(OH) 3 ·3H 2 O was unstable, with a solubility higher than 50 μg/l. • Amorphous Cr(OH) 3 (am) was stable with a solubility lower than 50 μg/l in the range 5.7 0.75 Cr 0.25 (OH) 3 , the stability region was extended to 4.8 3 ·xH 2 O whereas in the presence of iron the precipitate is a mixed Fe (1−x) Cr x (OH) 3 phase. In this study, we report on the synthesis, characterisation and stability of mixed (Fe x ,Cr 1−x )(OH) 3 hydroxides as compared to the stability of Cr(OH) 3 . We established that the plain Cr(III) hydroxide, abiding to the approximate molecular formula Cr(OH) 3 ·3H 2 O, was crystalline, highly soluble, i.e. unstable, with a tendency to transform into the stable amorphous hydroxide Cr(OH) 3 (am) phase. Mixed Fe 0.75 Cr 0.25 (OH) 3 hydroxides were found to be of the ferrihydrite structure, Fe(OH) 3 , and we correlated their solubility to that of a solid solution formed by plain ferrihydrite and the amorphous Cr(III) hydroxide. Both our experimental results and thermodynamic calculations indicated that mixed Fe(III)–Cr(III) hydroxides are more effective enhancers of groundwater quality, in comparison to the plain amorphous or crystalline Cr(III) hydroxides, the latter found to have a solubility typically higher than 50 μg/l (maximum EU permitted Cr level in drinking water), while the amorphous Cr(OH) 3 (am) phase was within the drinking water threshold in the range 5.7 0.75 Cr 0.25 (OH) 3 hydroxides studied were of extended stability in the 4.8 < pH < 13.5 range

  20. Aspectos Técnicos en la Producción de Caucho Hevea

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    Uribe Henao Alfonso

    1950-09-01

    Full Text Available El propósito primordial de este trabajo es el de hacer una exposición de los principales factores o aspectos técnicos que deben tenerse en cuenta en el planeamiento y desarrollo del cultivo de la Hevea, para poder obtener de él en la forma más económica el máximo beneficio. Se ha dacio preferencia a los aspectos técnicos concernientes al Hevea de mayor importancia, sin pretender exponerlos todos. No es pues su objetivo dar a conocer todos aquellos detalles y sistemas aconsejables y necesarios en su explotación que pudieran considerarse como principios elementales, y que más bien vienen a ser prácticas corrientes del cultivo.

  1. Adsorption behavior of Am(III) on granite

    International Nuclear Information System (INIS)

    Zhang Yingjie; Feng Xiaogui; Liang Junfu; Chen Jing; Su Rui; Wang Ju; Liu Chunli

    2009-01-01

    The adsorption behavior of Am(III) on granite (sampled from drilling well BS01 at Beishan (BS) area--a potential candidate site for China's high-level radioactive waste repository, the granite sample's depth about 300 m) was studied in BS03 well groundwater by a batch technique at (25±1) degree C. The influences of pH, sulphate ion, total carbonate ion, humic acid, and concentration of the Am(III) on the adsorption behavior were also studied, and the possible adsorption mechanism was discussed. Experimental results show that the adsorption distribution rate of Am(III) on granite increases with increasing pH of aqueous phase. The chemical composition of the groundwater is the main factor which influences the species of Am(III) and adsorption behavior. The adsorption mechanism of Am(III) on granite is surface complexation. The adsorption isotherm of Am(III) on granite can be described by Freundlich's equation. (authors)

  2. Aspectos ultra-estruturais da forma epimastigota do Trypanosoma cruzi em meio LIT

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    Wanderley de Souza

    1975-06-01

    Full Text Available E feito um estudo da ultra-estrutura da forma epismastigota do Trypanosoma cruzi mantida em meio de cultivo acelular. O núcleo das formas em divisão apresenta um aspecto homogêneo. Microtúbulos intranucleares são observados durante a divisão. No entanto, a membrana nuclear permanece íntegra. O citoplasma apresenta-se com vacúolos de dimensões e aspectos variados. Com o método do ácido periódico-tiosemicarbazida-proteinato de prata, polissacaríáeos e/ou glicoproteínas foram localizados na membrana celular e na membrana que delimita certos vacúolos citoplasmáticos.

  3. Aspectos de regulación sanitaria en Brasil

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    Jose Carlos Buzanello

    2016-06-01

    Full Text Available Mira a algunos aspectos de la regulación de los servicios de saneamiento en Brasil, específicamente la política de regulación resultante del proceso de reforma del Estado de 1995. Cuestiona los resultados de la productividad de los servicios de agua y alcantarillado de los concesionarios y el alcance de estas medidas al consumismo usuario.

  4. Aspectos éticos de la obesidad

    OpenAIRE

    de Santiago Martín, Sandra

    2016-01-01

    El sobrepeso y la obesidad se están convirtiendo en uno de los problemas de salud de mayor preocupación, convirtiéndose en los últimos años en una verdadera pandemia mundial. Los objetivos de esta revisión bibliográfica son analizar los aspectos éticos de la obesidad, desde el punto de vista de la familia y la sociedad, las buenas prácticas sanitarias, los principios bioéticos y de los derechos del paciente obeso. Para realizar este trabajo de investigación se accedieron a las bases de ...

  5. Aspectos puntuales del estado vegetativo persistente

    OpenAIRE

    Hodelín Tablada, Ricardo

    2013-01-01

    El estado vegetativo persistente es una condición clínica caracterizada por la ausencia completa de conciencia sobre uno mismo y el entorno, unido a ciclos de sueño-vigilia, con preservación total o parcial de las funciones hipotalámicas y autonómicas del tallo encefálico. En el presente artículo, el autor discute aspectos puntuales sobre la entidad clínica, basado en su experiencia y en la revisión de la bibliografía sobre el tema; igualmente se exponen elementos clínicos y epidemiológicos d...

  6. Magnetic anisotropy of dysprosium(III) in a low-symmetry environment: a theoretical and experimental investigation.

    Science.gov (United States)

    Bernot, Kevin; Luzon, Javier; Bogani, Lapo; Etienne, Mael; Sangregorio, Claudio; Shanmugam, Muralidharan; Caneschi, Andrea; Sessoli, Roberta; Gatteschi, Dante

    2009-04-22

    A mixed theoretical and experimental approach was used to determine the local magnetic anisotropy of the dysprosium(III) ion in a low-symmetry environment. The susceptibility tensor of the monomeric species having the formula [Dy(hfac)(3)(NIT-C(6)H(4)-OEt)(2)], which contains nitronyl nitroxide (NIT-R) radicals, was determined at various temperatures through angle-resolved magnetometry. These results are in agreement with ab initio calculations performed using the complete active space self-consistent field (CASSCF) method, validating the predictive power of this theoretical approach for complex systems containing rare-earth ions, even in low-symmetry environments. Susceptibility measurements performed with the applied field along the easy axis eventually permitted a detailed analysis of the temperature and field dependence of the magnetization, providing evidence that the Dy ion transmits an antiferromagnetic interaction between radicals but that the Dy-radical interaction is ferromagnetic.

  7. Insight into the Extraction Mechanism of Americium(III) over Europium(III) with Pyridylpyrazole: A Relativistic Quantum Chemistry Study.

    Science.gov (United States)

    Kong, Xiang-He; Wu, Qun-Yan; Wang, Cong-Zhi; Lan, Jian-Hui; Chai, Zhi-Fang; Nie, Chang-Ming; Shi, Wei-Qun

    2018-05-10

    Separation of trivalent actinides (An(III)) and lanthanides (Ln(III)) is one of the most important steps in spent nuclear fuel reprocessing. However, it is very difficult and challenging to separate them due to their similar chemical properties. Recently the pyridylpyrazole ligand (PypzH) has been identified to show good separation ability toward Am(III) over Eu(III). In this work, to explore the Am(III)/Eu(III) separation mechanism of PypzH at the molecular level, the geometrical structures, bonding nature, and thermodynamic behaviors of the Am(III) and Eu(III) complexes with PypzH ligands modified by alkyl chains (Cn-PypzH, n = 2, 4, 8) have been systematically investigated using scalar relativistic density functional theory (DFT). According to the NBO (natural bonding orbital) and QTAIM (quantum theory of atoms in molecules) analyses, the M-N bonds exhibit a certain degree of covalent character, and more covalency appears in Am-N bonds compared to Eu-N bonds. Thermodynamic analyses suggest that the 1:1 extraction reaction, [M(NO 3 )(H 2 O) 6 ] 2+ + PypzH + 2NO 3 - → M(PypzH)(NO 3 ) 3 (H 2 O) + 5H 2 O, is the most suitable for Am(III)/Eu(III) separation. Furthermore, the extraction ability and the Am(III)/Eu(III) selectivity of the ligand PypzH is indeed enhanced by adding alkyl-substituted chains in agreement with experimental observations. Besides this, the nitrogen atom of pyrazole ring plays a more significant role in the extraction reactions related to Am(III)/Eu(III) separation compared to that of pyridine ring. This work could identify the mechanism of the Am(III)/Eu(III) selectivity of the ligand PypzH and provide valuable theoretical information for achieving an efficient Am(III)/Eu(III) separation process for spent nuclear fuel reprocessing.

  8. Bases epistemológicas da psicologia cognitiva experimental

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    Carmem Beatriz Neufeld

    Full Text Available O presente artigo tem como objetivo analisar as bases epistemológicas da Psicologia Cognitiva Experimental. Inicialmente serão traçados alguns dos pressupostos da Psicologia Cognitiva, dentro da abrangência da Ciência Cognitiva e sua relação com o Cognitivismo. Serão retomados alguns aspectos históricos que serão relacionados com os pressupostos das teorias e suas influências na aplicação das mesmas. A partir destes aspectos, serão levantados alguns dos pressupostos filosóficos que marcaram a transição de modelos em ciência, enfocando por fim a emergência da Ciência Cognitiva. O presente trabalho conclui enfocando os argumentos pró e contra a revolução cognitiva enquanto quebra de paradigma com o Behaviorismo.

  9. Aspectos comportamentais na gestão de projetos: uma análise bibliométrica (1988-2014

    Directory of Open Access Journals (Sweden)

    Diane Aparecida dos Reis Silva

    Full Text Available Resumo A demanda por gerentes de projetos é crescente. Um dos principais fatores que impactam no desempenho desse profissional relaciona-se ao aspecto comportamental, ou seja, àquele em que as relações e o entendimento entre os indivíduos de um grupo são fundamentais. Ante essa problemática, o objetivo deste trabalho foi realizar uma análise bibliométrica sobre aspectos comportamentais na gestão de projetos, buscando identificar as relações entre aspectos comportamentais e o gerenciamento de projetos. Para tanto, utilizou-se a metodologia bibliométrica: as bases de dados que compõem a amostra foram coletadas em ISI Web of Science e Scopus, desde que os artigos da Scopus também estivessem na base principal da ISI Web of Science. As análises sugerem ou evidenciam que os aspectos comportamentais, o “lado humano”, se apresenta como fator essencial para o sucesso na gestão de projetos.

  10. ASPECTOS ERGONÔMICOS E POSTURAIS EM CENTRO DE MATERIAL

    Directory of Open Access Journals (Sweden)

    Neusa Maria Cosía Alexandre

    Full Text Available Determinados fatores ambientais inadequados podem provocar lesões na coluna vertebral. Este trabalho discute certos aspectos ergonômicos e posturais específicos em Centro de Material com o objetivo de desenvolver uma consciência crítica a respeito dos efeitos do local de trabalho sobre a saúde.

  11. Prediction of ROSA-III experiment

    International Nuclear Information System (INIS)

    Soda, Kunihisa

    1978-06-01

    ROSA-III experiment with the simulated BWR system is to investigate thermal hydraulic behavior as well as ECCS performance in a postulated loss-of-coolant accident. RUN 701 assumes average core power, high and low pressure core sprays and low pressure injection of ECCS. Prediction of experiment RUN 701 was made with computer code RELAP-4J. The results indicate the need for ROSA-III pump characteristics to be clarified and for liquid level formation model to be improved. Comparison of the prediction results with the experimental data should reveal the areas of modifications in calculation model. (auth.)

  12. Aspectos da tomografia computadorizada craniana na neurocisticercose na infância

    Directory of Open Access Journals (Sweden)

    Marilisa M. Guerreiro

    1989-06-01

    Full Text Available Os autores relatam aspectos tomográficos da neurocisticercose na infância a propósito da análise de 27 exames em 18 pacientes, que foram distribuídos em três grupos segundo o quadru clínico e os achados tomográficos. O grupo 1 foi caracterizado basicamente por epilepsias e calcificações. O grupo 2 caracterizou-se por hipertensão intracraniana e diversos aspectos tomográficos: edema, cistos e nódulos em três pacientes; hidrocefalia e calcificações em dois pacientes e normal em um paciente. O grupo 3 consistiu clinicamente de epilepsia e cefaléia, com vários padrões tomográficos. Os resultados são discutidos à luz da literatura disponível.

  13. Algunos aspectos éticos en la práctica de la obstetricia

    Directory of Open Access Journals (Sweden)

    DR. P. Sergio Valenzuela

    2014-11-01

    Full Text Available La obstetricia ejercida en el contexto clínico asistencial es una fuente permanente de cuestionamientos éticos para los especialistas. En este artículo, que tiene carácter de ensayo, se aborda una primera parte introductoria, que da cuenta de la dimensión antropológica del cuidado obstétrico. Luego se destaca la necesidad de referirse a un número mayor de principios en la fundamentación del quehacer obstétrico. Por último, profundiza principalmente en los aspectos éticos de su ejercicio como obstetricia de urgencia y la ética del diagnóstico; quedando aspectos importantes para discutir en una futura oportunidad.

  14. Planificación estratégica: aspectos introductorios (I)

    OpenAIRE

    Galindo Reyes, Fuensanta Carmen; De la Varga Salto, José María

    2016-01-01

    Transparencias como material docente para la asignatura de Administración de Organizaciones. Se corresponden con la etapa primera del proceso administrativo de las organizaciones, la planificación estratétiga. En concreto, incluyen aspectos introductorios relacionados con los conceptos y elementos principales de la planificación estratégica. Planificación estratégica

  15. The UK MK III GCR experimental physics programme at AEE Winfrith

    Energy Technology Data Exchange (ETDEWEB)

    Johnstone, I

    1972-06-15

    The UK programme of reactor physics experiments in support of the Mk III GCR project started in 1968/69 and has now reached its third main phase. The overall programme is broadly summarised in this report.

  16. Ultrastructural aspects of experimental cryptosporidiosis in pigs Aspectos ultraestruturais da criptosporidiose experimental em suínos

    Directory of Open Access Journals (Sweden)

    A.P.F.R.L. Bracarense

    1999-10-01

    Full Text Available The aim of this work was to determine ultrastructural changes on the intestinal mucosa and associated lymphoid tissues after an experimental infection with Cryptosporidium sp. Twelve piglets dosed orally with 1×10(6 oocysts were slaughtered on days 3, 6, 9 and 12 after inoculation. The ultrastructural lesions in the intestinal cells were irregular with thickened microvilli, cytoplasmic protrusions and vacuolation, swollen mitochondria, hypertrophic organelles and nuclei. The lymphocytes of the Peyer’s patches occasionally were mitotic with a larger number of lymphoblasts in the inoculated animals.O presente estudo teve por objetivo investigar as alterações ultraestruturais da mucosa intestinal e do tecido linfóide associado na inoculação experimental de Cryptosporidium sp. Doze leitões foram inoculados experimentalmente por via oral com 1×10(6 oocistos e sacrificados 3, 6, 9 e 12 dias depois. Ao exame ultraestrutural de células intestinais observou-se espessamento e irregularidade de microvilosidades, citoplasma vacuolizado e com protrusões, edema mitocondrial, hipertrofia de organelas citoplasmáticas e do núcleo. Nas placas de Peyer observou-se ocasionalmente mitose de células linfóides, verificando-se maior número de células blásticas.

  17. Aspectos sociales de la malaria importada en Latinoamérica

    Directory of Open Access Journals (Sweden)

    Alfonso J. Rodríguez-Morales

    2008-04-01

    Full Text Available La malaria continúa siendo un grave problema de salud pública mundial, ya no sólo en países endémicos, sino comenzando a representar un dilema médico en países distantes por la llegada de casos importados. Ahora bien, aun cuando en términos de las disciplinas médicas convencionales se ha publicado muchos estudios clínico-epidemiológicos y reportes de caso, los aspectos sociales, que parecerían obvios en el contexto de la malaria importada por supeditarse a la migración de la población, no han sido exhaustivamente explorados en relación con este fenómeno. Por estas razones, en esta revisión se analiza los aspectos sociales relacionados con el fenómeno de la malaria importada con énfasis al contexto epidemiológico de América Latina.

  18. Aspectos éticos en Pediatría, las inmunodeficiencias primarias

    Directory of Open Access Journals (Sweden)

    Martha Leonor Paradoa Pérez

    2012-12-01

    Full Text Available Las inmunodeficiencias primarias son enfermedades genéticas, caracterizadas por infecciones crónicas devastadoras que conllevan a la muerte, al desarrollo de tumores y a enfermedades autoinmunes, y la mayoría de estas enfermedades cursan en la edad pediátrica. Desde la última década del pasado siglo, el desarrollo de la tecnología, el surgimiento del Proyecto del Genoma Humano y la profundización en los aspectos bioéticos, han dado lugar a especificidades en la atención médica e investigativa del paciente pediátrico y del que desarrolla una enfermedad inmunológica. Este trabajo recoge los aspectos bioéticos más importantes y los dilemas éticos con los que se enfrenta el inmunólogo pediátrico en la atención al paciente con inmunodeficiencia primaria, el cual demanda la atención de, prácticamente, todas las especialidades pediátricas.

  19. Aspectos geopolíticos en el desarrollo de la zona franca industrial de Ilo

    OpenAIRE

    Cardenas Nuñez, Gilberto; Cardenas Nuñez, Gilberto

    1994-01-01

    El presente trabajo de Tesis enfatiza el aspecto geopolítico en el desarrollo de la Zona franca Industrial de Ilo (ZOFRI-IL0). La razón de tal énfasis es simple: por este aspecto específicamente es que se creó la ZOFRI-ILO. En consecuencia, el tratamiento del tema tiene que ver con la influencia geopolítica en las sucesivas etapas de su desarrollo, considerando sus posibilidades de desarrollo a futuro en el marco de las tendencias internacionales de la globalización de la economía mundial. ...

  20. Ion beam nanopatterning of III-V semiconductors: consistency of experimental and simulation trends within a chemistry-driven theory.

    Science.gov (United States)

    El-Atwani, O; Norris, S A; Ludwig, K; Gonderman, S; Allain, J P

    2015-12-16

    Several proposed mechanisms and theoretical models exist concerning nanostructure evolution on III-V semiconductors (particularly GaSb) via ion beam irradiation. However, making quantitative contact between experiment on the one hand and model-parameter dependent predictions from different theories on the other is usually difficult. In this study, we take a different approach and provide an experimental investigation with a range of targets (GaSb, GaAs, GaP) and ion species (Ne, Ar, Kr, Xe) to determine new parametric trends regarding nanostructure evolution. Concurrently, atomistic simulations using binary collision approximation over the same ion/target combinations were performed to determine parametric trends on several quantities related to existing model. A comparison of experimental and numerical trends reveals that the two are broadly consistent under the assumption that instabilities are driven by chemical instability based on phase separation. Furthermore, the atomistic simulations and a survey of material thermodynamic properties suggest that a plausible microscopic mechanism for this process is an ion-enhanced mobility associated with energy deposition by collision cascades.

  1. Thermodynamic model for solution behavior and solid-liquid equilibrium in Na-Al(III)-Fe(III)-Cr(III)-Cl-H2O system at 25°C

    Science.gov (United States)

    André, Laurent; Christov, Christomir; Lassin, Arnault; Azaroual, Mohamed

    2018-03-01

    The knowledge of the thermodynamic behavior of multicomponent aqueous electrolyte systems is of main interest in geo-, and environmental-sciences. The main objective of this study is the development of a high accuracy thermodynamic model for solution behavior, and highly soluble M(III)Cl3(s) (M= Al, Fe, Cr) minerals solubility in Na-Al(III)-Cr(III)-Fe(III)-Cl-H2O system at 25°C. Comprehensive thermodynamic models that accurately predict aluminium, chromium and iron aqueous chemistry and M(III) mineral solubilities as a function of pH, solution composition and concentration are critical for understanding many important geochemical and environmental processes involving these metals (e.g., mineral dissolution/alteration, rock formation, changes in rock permeability and fluid flow, soil formation, mass transport, toxic M(III) remediation). Such a model would also have many industrial applications (e.g., aluminium, chromium and iron production, and their corrosion, solve scaling problems in geothermal energy and oil production). Comparisons of solubility and activity calculations with the experimental data in binary and ternary systems indicate that model predictions are within the uncertainty of the data. Limitations of the model due to data insufficiencies are discussed. The solubility modeling approach, implemented to the Pitzer specific interaction equations is employed. The resulting parameterization was developed for the geochemical Pitzer formalism based PHREEQC database.

  2. Kinetic of liquid-liquid extraction for uranyl nitrate and actinides (III) and lanthanides (III) nitrates by amide extractants

    International Nuclear Information System (INIS)

    Toulemonde, V.; CEA Centre d'Etudes de la Vallee du Rhone, 30 -Marcoule

    1995-01-01

    The kinetics of liquid-liquid extraction by amide extractants have been investigated for uranyl nitrate (monoamide extractants), actinides (III) and lanthanides (III) nitrates (diamide extractants). The transfer of the metallic species from the aqueous phase to the organic phase was studied using two experimental devices: ARMOLLEX (Argonne Modified Lewis cell for Liquid Liquid Extraction) and RSC (Rotating Stabilized Cell). The main conclusions are: for the extraction of uranyl nitrate by DEHDMBA monoamide, the rate-controlling step is the complexation of the species at the interface of the two liquids. Thus, an absorption-desorption (according to Langmuir theory) reaction mechanism was proposed; for the extraction of actinides (III) and lanthanides (III) nitrates in nitric acid media by DMDBTDMA diamide, the kinetic is also limited by interfacial reactions. The behavior of Americium and Europium is very similar as fare as their reaction kinetics are concerned. (author)

  3. Formación en recreación en Colombia: aspectos fundamentales para el estudio

    Directory of Open Access Journals (Sweden)

    Juan Manuel Carreño Cardozo

    2010-12-01

    Full Text Available El escrito presenta la reflexión fundamental de la investigación Estado del arte de los conceptos de recreación en Colombia, en Instituciones de educación técnica-tecnológica y de pregrado en recreación y afines originado en la línea de Investigación formar - Formación de Maestros en Recreación3 del programa Licenciatura en Recreación de la Facultad de Educación Física en la Universidad Pedagógica Nacional. La reflexión contiene los aspectos fundamentales que se postulan en la investigación para el acercamiento de la formación profesional en recreación en Colombia. Con este fin se desarrollan: I. La construcción de objetos sobre formación, II. La formación profesional en recreación, III. Marcos normativos y lineamientos y IV. investigaciones previas. Sobre estos apartes se pretende establecer una base de antecedentes que faciliten la aproximación de la formación en recreación como espacio particular de estudio, orientada a la consolidación del campo de la recreación, articulado a sus posibilidades laborales y académicas.

  4. Aspectos “Subjetivos” do Fetichismo da Mercadoria Cultural no Ensaio Sobre Música Popular de T. W. Adorno

    Directory of Open Access Journals (Sweden)

    Fábio César da Silva

    2017-05-01

    Full Text Available Neste artigo, apresento uma leitura do ensaio Sobre Música Popular (1941 de T. W. Adorno (1903-1969, enfatizando os aspectos “subjetivos” do fetichismo da mercadoria cultural. Considero aspectos “subjetivos” do fetichismo quando se enfatiza o consumo de mercadorias. Esse ensaio fez parte dos resultados de pesquisa de rádio da Universidade de Princeton, feita nos Estados Unidos entre 1938 a 1940, cujo objetivo era analisar as programações radiofônicas. Focarei a leitura na seção Teoria do Ouvinte, pois nela Adorno enfatizou esses aspectos “subjetivos” por meio de análises específicas do consumo da música popular americana supondo seus modos de recepção.

  5. Isothiocyanato complexes of Gd(III), Tb(III), Dy(III) and Ho(III) with 2-(2'-pyridyl)benzimidazole

    Energy Technology Data Exchange (ETDEWEB)

    Mishra, A; Singh, V K

    1982-01-01

    Six-coordinated complexes of the type (Ln(PyBzH)/sub 2/NCS.H/sub 2/O) (NCS)/sub 2/.nH/sub 2/O/mC/sub 2/H/sub 5/OH (Ln = Gd(III), Tb(III), Dy(III) and Ho(III), n=1-2; m=1) have been prepared from Ln(NCS)/sub 6//sup 3 -/. The room temperature magnetic moment values confirm the terpositive state of the lanthanide ions. Infrared spectra suggest the N-coordination of thiocyanate group. Electronic spectral studies of Tb(III), Dy(III) and Ho(III) complexes have been made in terms of LSJ term energies. 13 refs.

  6. Structure of metal-rich (001) surfaces of III-V compound semiconductors

    DEFF Research Database (Denmark)

    Kumpf, C.; Smilgies, D.; Landemark, E.

    2001-01-01

    The atomic structure of the group-III-rich surface of III-V semiconductor compounds has been under intense debate for many years, yet none of the models agrees with the experimental data available. Here we present a model for the three-dimensional structure of the (001)-c(8x2) reconstruction on In......(8 x 2) reconstructions of III-V semiconductor surfaces contain the same essential building blocks....

  7. Los aspectos socioculturales de la migración en la frontera norte

    Directory of Open Access Journals (Sweden)

    Oscar Priego Hernández

    2011-12-01

    Full Text Available México se considera el país de emigrantes más importante del mundo y Estados Unidos el principal país de inmigrantes. Su posición geográfica en la frontera Norte lo convierten atractivo para los flujos migratorios de los países centroamericanos. Hoy enfrenta los retos de la crisis financiera internacional de los últimos años que afecta las economías y las relaciones bilaterales. Este trabajo consiste en realizar un estudio de la problemática de los aspectos socioculturales provocada por la migración de personas, analizar fortalezas y debilidades, identificar los nuevos aspectos de la migración y proponer alternativas para mejorar las condiciones de vida de los migrantes mexicanos.

  8. Kinetic of liquid-liquid extraction for uranyl nitrate and actinides (III) and lanthanides (III) nitrates by amide extractants; Cinetique d`extraction liquide-liquide du nitrate d`uranyle et des nitrates d`actinides (III) et de lanthanides (III) par des extractants a fonction amide

    Energy Technology Data Exchange (ETDEWEB)

    Toulemonde, V [CEA Centre d` Etudes Nucleaires de Saclay, 91 -Gif-sur-Yvette (France); [CEA Centre d` Etudes de la Vallee du Rhone, 30 -Marcoule (France). Dept. d` Exploitation du Retraitement et de Demantelement

    1995-12-20

    The kinetics of liquid-liquid extraction by amide extractants have been investigated for uranyl nitrate (monoamide extractants), actinides (III) and lanthanides (III) nitrates (diamide extractants). The transfer of the metallic species from the aqueous phase to the organic phase was studied using two experimental devices: ARMOLLEX (Argonne Modified Lewis cell for Liquid Liquid Extraction) and RSC (Rotating Stabilized Cell). The main conclusions are: for the extraction of uranyl nitrate by DEHDMBA monoamide, the rate-controlling step is the complexation of the species at the interface of the two liquids. Thus, an absorption-desorption (according to Langmuir theory) reaction mechanism was proposed; for the extraction of actinides (III) and lanthanides (III) nitrates in nitric acid media by DMDBTDMA diamide, the kinetic is also limited by interfacial reactions. The behavior of Americium and Europium is very similar as fare as their reaction kinetics are concerned. (author). 89 refs.

  9. Design studies for the Mark-III core of experimental multi-purpose VHTR

    International Nuclear Information System (INIS)

    Yasuno, Takehiko; Miyamoto, Yoshiaki; Mitake, Susumu; Shindo, Ryuiti; Arai, Taketoshi

    1979-08-01

    The Mark-III core in the first conceptual design made in 1975 is a fundamental core for VHTR. Subsequently, further design studies were made fuel loading scheme and control rod withdrawal sequence for the core to increase its safety margin (shutdown margin, etc.) and operational margin (minimum Reynolds number, maximum fuel temperature, etc.). It was shown that the Mark-III should exhibit the performance expected of VHTR, unless changes are made in the preconditions for its nuclear, thermal-hydraulic design. Also, the needs as below were indicated: (1) reasonable core design criteria and guidelines, (2) fuel-loading-scheme requirements in fuel management, fuel misloading and reactor operation, (3) confirmation on precision of the core design method and its further refinement. (author)

  10. Planificación estratégica: aspectos introductorios (II)

    OpenAIRE

    Galindo Reyes, Fuensanta Carmen; De la Varga Salto, José María

    2016-01-01

    Transparencias como material docente para la asignatura de Administración de Organizaciones. Se corresponden con la etapa primera del proceso administrativo de las organizaciones, la planificación estratégica. En concreto, incluyen aspectos introductorios relacionados con el análisis del entorno y el análisis interno, así como con el concepto y las características de los objetivos estratégicos.

  11. Synthesis, characterization and stability of Cr(III) and Fe(III) hydroxides

    Energy Technology Data Exchange (ETDEWEB)

    Papassiopi, N.; Vaxevanidou, K.; Christou, C.; Karagianni, E.; Antipas, G.S.E., E-mail: gantipas@metal.ntua.gr

    2014-01-15

    Highlights: • Fe(III)–Cr(III) hydroxides enhance groundwater quality better than pure Cr(III) compounds. • Crystalline Cr(OH){sub 3}·3H{sub 2}O was unstable, with a solubility higher than 50 μg/l. • Amorphous Cr(OH){sub 3}(am) was stable with a solubility lower than 50 μg/l in the range 5.7 < pH < 11. • For mixed Fe{sub 0.75}Cr{sub 0.25}(OH){sub 3}, the stability region was extended to 4.8 < pH < 13.5. -- Abstract: Chromium is a common contaminant of soils and aquifers and constitutes a major environmental problem. In nature, chromium usually exists in the form of two oxidation states, trivalent, Cr(III), which is relatively innocuous for biota and for the aquatic environment, and hexavalent, Cr(VI) which is toxic, carcinogenic and very soluble. Accordingly, the majority of wastewater and groundwater treatment technologies, include a stage where Cr(VI) is reduced to Cr(III), in order to remove chromium from the aqueous phase and bind the element in the form of environmentally stable solid compounds. In the absence of iron the final product is typically of the form Cr(OH){sub 3}·xH{sub 2}O whereas in the presence of iron the precipitate is a mixed Fe{sub (1−x)}Cr{sub x}(OH){sub 3} phase. In this study, we report on the synthesis, characterisation and stability of mixed (Fe{sub x},Cr{sub 1−x})(OH){sub 3} hydroxides as compared to the stability of Cr(OH){sub 3}. We established that the plain Cr(III) hydroxide, abiding to the approximate molecular formula Cr(OH){sub 3}·3H{sub 2}O, was crystalline, highly soluble, i.e. unstable, with a tendency to transform into the stable amorphous hydroxide Cr(OH){sub 3}(am) phase. Mixed Fe{sub 0.75}Cr{sub 0.25}(OH){sub 3} hydroxides were found to be of the ferrihydrite structure, Fe(OH){sub 3}, and we correlated their solubility to that of a solid solution formed by plain ferrihydrite and the amorphous Cr(III) hydroxide. Both our experimental results and thermodynamic calculations indicated that mixed Fe(III)–Cr(III

  12. Eugenia vinculada a aspectos bioéticos: uma revisão integrativa

    Directory of Open Access Journals (Sweden)

    Vanessa Cruz Santos

    Full Text Available O objetivo do estudo é analisar o que versam as produções científicas sobre eugenia, vinculando-as com aspectos bioéticos. Trata-se de uma revisão integrativa de literatura. Os dados foram coletados nas bases de dados Lilacs e SciELO, por meio dos descritores: eugenia, etnia e saúde, ética e bioética. Para a análise e posterior síntese dos artigos foi utilizada figura sinóptica. Verificou-se que a eugenia viola os direitos humanos, contradiz com o princípio da solidariedade e coloca em risco a diversidade humana. Conclui-se que houve déficit de artigos que abordem aspectos bioéticos vinculados à eugenia, assim, este estudo poderá contribuir para a reflexão sobre essa articulação.

  13. Complexes of 4-chlorophenoxyacetates of Nd(III), Gd(III) and Ho(III)

    International Nuclear Information System (INIS)

    Ferenc, W.; Bernat, M; Gluchowska, H.W.; Sarzynski, J.

    2010-01-01

    The complexes of 4-chlorophenoxyacetates of Nd(III), Gd(III) and Ho(III) have been synthesized as polycrystalline hydrated solids, and characterized by elemental analysis, spectroscopy, magnetic studies and also by X-ray diffraction and thermogravimetric measurements. The analysed complexes have the following colours: violet for Nd(III), white for Gd(III) and cream for Ho(III) compounds. The carboxylate groups bind as bidentate chelating (Ho) or bridging ligands (Nd, Gd). On heating to 1173K in air the complexes decompose in several steps. At first, they dehydrate in one step to form anhydrous salts, that next decompose to the oxides of respective metals. The gaseous products of their thermal decomposition in nitrogen were also determined and the magnetic susceptibilities were measured over the temperature range of 76-303K and the magnetic moments were calculated. The results show that 4-chlorophenoxyacetates of Nd(III), Gd(III) and Ho(III) are high-spin complexes with weak ligand fields. The solubility value in water at 293K for analysed 4-chlorophenoxyacetates is in the order of 10 -4 mol/dm 3 . (author)

  14. Aspectos valorizados por porfissionais de enfermagem na higiene pessoal e na higiene corporal do paciente

    Directory of Open Access Journals (Sweden)

    Elóide André Oliveira

    2003-10-01

    Full Text Available Survey descritivo, com o qual se objetivou identificar que aspectos da higiene corporal são valorizados pelos componentes da equipe de enfermagem, na higiene corporal pessoal e na higiene corporal do paciente. A pesquisa foi desenvolvida em oito instituições públicas de saúde e a amostra foi composta por 126 profissionais de enfermagem, correspondendo a 12,8% do total de 986 componentes das equipes de enfermagem destas instituições. Na higiene corporal pessoal, chamou a atenção o fato de que os cuidados com as unhas e com os cabelos tenham suplantado, no número de citações dos profissionais de enfermagem, aspectos básicos como o cuidado com as mãos. Na higiene corporal do paciente, o banho foi o aspecto considerado mais importante pelas três categorias profissionais; a higiene oral, pelas(os enfermeiras(os e auxiliares de enfermagem; e as unhas, pelas(os enfermeiras(os e técnicas(os de enfermagem.

  15. Chicken line-dependent mortality after experimental infection with three type IIxIII recombinant Toxoplasma gondii clones.

    Science.gov (United States)

    Schares, G; Herrmann, D C; Maksimov, P; Matzkeit, B; Conraths, F J; Moré, G; Preisinger, R; Weigend, S

    2017-09-01

    Three genetically different clones of Toxoplasma gondii, also different in mouse virulence, were studied by experimental infection in chickens. For the experiments, four chicken lines were used, which differed in phylogenetic origin and performance level: two white egg layer lines, one with high laying performance (WLA), one with low (R11) and two brown layer lines, also displaying high (BLA) and low (L68) egg number. Chickens were intraperitoneally infected with three different T. gondii isolates representing type IIxIII recombinant clones, i.e. showing both, type II- and type III-specific alleles. These clones (K119/2 2C10, B136/1 B6H6, K119/2 A7) had exhibited virulence differences in a mouse model. In chickens, a significantly higher mortality was observed in white layer lines, but not in brown layer lines, suggesting that differences in the phylogenetic background may influence the susceptibility of chickens for toxoplasmosis. In addition, antibody (IgY) levels varied in surviving chickens at 31 days post infection. While low to intermediate antibody levels were observed in white layers, intermediate to high levels were measured in brown layers. Infection with a T. gondii clone showing low chicken virulence resulted in higher antibody levels in all chicken lines compared to infection with T. gondii clones of intermediate or high chicken virulence. This was in agreement with the parasite load as determined by real-time PCR. Overall, results show that progeny resulting from natural sexual recombination of T. gondii clonal lineages, may differ in their virulence for mice and chickens. Copyright © 2016 Elsevier Inc. All rights reserved.

  16. Aspectos bioéticos del consentimiento informado en investigación con población vulnerable

    Directory of Open Access Journals (Sweden)

    Fabio Alberto Garzón Díaz

    2009-01-01

    Full Text Available El presente artículo es el resultado de 10 años de investigación en el tema del Consentimiento Informado en Investigación Biomédica. Este artículo presenta un análisis sistemático de los aspectos teóricos y prácticos del consentimiento informado en personas y poblaciones vulnerables. Aborda la cuestión a partir de todos los ángulos pertinentes, desde el histórico hasta el jurídico, pasando por la fundamentación filosófica, psicológica, antropológica y didáctica del consentimiento informado. La profundidad en el recorrido por los aspectos teóricos se ve complementada por la presentación de los aspectos más prácticos, que llega hasta la formulación de propuestas muy concretas para la mejora del consentimiento informado.

  17. Interpretation of recovery stage III in gold. [Electron irradiation

    Energy Technology Data Exchange (ETDEWEB)

    Seeger, A.; Frank, W. (Max-Planck-Institut fuer Metallforschung, Stuttgart (Germany, F.R.). Inst. fuer Physik; Stuttgart Univ. (Germany, F.R.). Inst. fuer Theoretische und Angewandte Physik)

    1983-05-01

    The paper compares a recent investigation of Stage-III recovery on electron-irradiated gold by Sonnenberg and Dedek with earlier work on cold-worked or quenched gold. The experimental results of Sonnenberg and Dedek are found to be in excellent agreement with those of Schuele, Seeger, Schumacher, and King, who showed that in Au Stage III is due to the migration of an elementary intrinsic point defect with migration enthalpy Hsup(III) = (0.71 +- 0.02)eV. Since the monovacancy migration enthalpy Hsub(IVsup(M)) = (0.83 +- 0.02)eV obtained by Schuele et al. has been confirmed by other workers and independent techniques, it is concluded that Hsup(III) represents the migration enthalpy of isolated self-interstitials.

  18. Evidence for vacancy migration in stage III for copper

    International Nuclear Information System (INIS)

    Antesberger, G.; Sonnenberg, K.; Wienhold, P.; Coltman, R.R.; Klabunde, C.E.; Williams, J.M.

    1975-01-01

    Specimens doped with interstitial clusters and single vacancies have been annealed isochronally through the temperature range of stage III. Combining this annealing with a test irradiation after each annealing step reactions of mobile single test interstitials with the doping defects were studied. These reactions provide information about the variation of the doping defect structure during annealing. The experimental results suggest that vacancy clusters are formed in stage III

  19. Aspectos biopsicossociais na surdocegueira Bio psycho social aspects in deaf blindness

    Directory of Open Access Journals (Sweden)

    Susana Maria Mana de Aráoz

    2008-04-01

    Full Text Available O presente artigo tem por objetivo discutir aspectos biopssicossociais referentes a pessoas com surdocegueira e suas famílias com o objetivo trazer a tona estas questões que se tem mostrado importantes para o desenvolvimento dos atendimentos aos surdocegos. Está baseado em dados bibliográficos de pesquisas com pais e outras divulgações abordando as causas que são, principalmente, Rubéola Congênita, prematuridade, infecções, acidentes, síndromes genéticas ou não. Coloca as conseqüências das mesmas, o desenvolvimento educacional alcançado e as necessidades das famílias em aspectos ligadas às áreas da saúde, educação, lazer, segurança e inclusão social. Também trata da adaptação das famílias ao impacto produzido pela surdocegueira tendo em conta aspectos orgânicos, afetivo-relacional, sócio-culturais e de produtividade. Reflete sobre a necessidade da divulgação dos conhecimentos e da ação conjunta de todas as partes envolvidas nos mais diversos aspectos da vida dos surdocegos para conseguir o desenvolvimento dos atendimentos para os surdocegos.The objective of the present article is to discuss bio-psycho-social aspects related to people with deaf blindness and their families so as to highlight those issues that have become important for the development of working methods in deaf blindness. It is based on bibliographic data found in research with parents of deaf blind children and other publications that deal with the causes of the condition. The main causes are congenital German measles, prematurity, infection, genetic or non genetic syndromes. The authors discuss the results of the various presentations, the expected educational development and the needs of the families in aspects related to health, education, leisure, safety and social inclusion. They also discusses issues of family adaptation to the impact produced by deaf blindness, taking into account organic, social-cultural, affect and inter

  20. Thermodynamic model for solution behavior and solid-liquid equilibrium in Na-Al(III-Fe(III-Cr(III-Cl-H2O system at 25°C

    Directory of Open Access Journals (Sweden)

    André Laurent

    2018-03-01

    Full Text Available The knowledge of the thermodynamic behavior of multicomponent aqueous electrolyte systems is of main interest in geo-, and environmental-sciences. The main objective of this study is the development of a high accuracy thermodynamic model for solution behavior, and highly soluble M(IIICl3(s (M= Al, Fe, Cr minerals solubility in Na-Al(III-Cr(III-Fe(III-Cl-H2O system at 25°C. Comprehensive thermodynamic models that accurately predict aluminium, chromium and iron aqueous chemistry and M(III mineral solubilities as a function of pH, solution composition and concentration are critical for understanding many important geochemical and environmental processes involving these metals (e.g., mineral dissolution/alteration, rock formation, changes in rock permeability and fluid flow, soil formation, mass transport, toxic M(III remediation. Such a model would also have many industrial applications (e.g., aluminium, chromium and iron production, and their corrosion, solve scaling problems in geothermal energy and oil production. Comparisons of solubility and activity calculations with the experimental data in binary and ternary systems indicate that model predictions are within the uncertainty of the data. Limitations of the model due to data insufficiencies are discussed. The solubility modeling approach, implemented to the Pitzer specific interaction equations is employed. The resulting parameterization was developed for the geochemical Pitzer formalism based PHREEQC database.

  1. Comparison with experiment of COMETHE III-L fuel rod behaviour predictions

    International Nuclear Information System (INIS)

    Vliet, J. van; Billaux, M.

    1983-01-01

    A comparison is presented between experimental results and COMETHE III-L fuel rod behaviour predictions. The first part of the paper focuses on mechanical aspects, with as main experiments, AECL X-264 and Studsvik Interramp. The second part presents the results of a wide FGR benchmarking campaign, with a reference to previous COMETHE versions. It appears that the variance between experiment and calculation has decreased by a factor four when the III-J version was improved into the III-L version. As conclusion, some COMETHE III-L calculations are presented in order to illustrate its capability of predicting fuel rod performance limits. (author)

  2. Fate of circulating amino-terminal propeptide of type III procollagen in conscious pigs

    DEFF Research Database (Denmark)

    Jensen, L T; Henriksen, Jens Henrik Sahl; Risteli, J

    1993-01-01

    The amino-terminal propeptide of type III procollagen (PIIINP, M(r) 42,000) is a promising marker for the formation of type III collagen of granulation tissue in experimental and clinical studies. The disposal kinetics of circulating PIIINP is, however, almost unknown. In conscious pigs with a th......The amino-terminal propeptide of type III procollagen (PIIINP, M(r) 42,000) is a promising marker for the formation of type III collagen of granulation tissue in experimental and clinical studies. The disposal kinetics of circulating PIIINP is, however, almost unknown. In conscious pigs...... of the plasma disappearance curve originated from the formation and disappearance of a high and a low molecular weight (MW) fraction as part of the degradation of PIIINP. The high MW fraction (approximately M(r) 90,000) was similar to a previously described, but not further characterized, PIIINP immunoreactive...

  3. Linguagem e aspectos visuo-espaciais : uma abordagem neurolinguistica

    OpenAIRE

    Carla Queiroz Pereira

    2006-01-01

    Resumo: O objetivo deste trabalho de pesquisa é investigar como o sujeito JS - não afásico após sofrer três acidentes vasculares cerebrais isquêmicos (AVCi?s) que lesionaram regiões parieto-occipitais de ambos os hemisférios cerebrais - realiza determinadas atividades lingüístico-cognitivas que envolvem aspectos vísuo-espaciais relacionados ao corpo, à escrita, à leitura de textos e de horas. Com base na Neurolingüística discursivamente orientada, na Neuropsicologia luriana e nas bases biológ...

  4. Epidermal Growth Factor Receptor Variant III (EGFRvIII) Positivity in EGFR-Amplified Glioblastomas: Prognostic Role and Comparison between Primary and Recurrent Tumors.

    Science.gov (United States)

    Felsberg, Jörg; Hentschel, Bettina; Kaulich, Kerstin; Gramatzki, Dorothee; Zacher, Angela; Malzkorn, Bastian; Kamp, Marcel; Sabel, Michael; Simon, Matthias; Westphal, Manfred; Schackert, Gabriele; Tonn, Jörg C; Pietsch, Torsten; von Deimling, Andreas; Loeffler, Markus; Reifenberger, Guido; Weller, Michael

    2017-11-15

    Purpose: Approximately 40% of all glioblastomas have amplified the EGFR gene, and about half of these tumors express the EGFRvIII variant. The prognostic role of EGFRvIII in EGFR -amplified glioblastoma patients and changes in EGFRvIII expression in recurrent versus primary glioblastomas remain controversial, but such data are highly relevant for EGFRvIII-targeted therapies. Experimental Design: EGFR -amplified glioblastomas from 106 patients were assessed for EGFRvIII positivity. Changes in EGFR amplification and EGFRvIII status from primary to recurrent glioblastomas were evaluated in 40 patients with EGFR -amplified tumors and 33 patients with EGFR -nonamplified tumors. EGFR single-nucleotide variants (SNV) were assessed in 27 patients. Data were correlated with outcome and validated in 150 glioblastoma patients from The Cancer Genome Atlas (TCGA) consortium. Results: Sixty of 106 EGFR -amplified glioblastomas were EGFRvIII-positive (56.6%). EGFRvIII positivity was not associated with different progression-free or overall survival. EGFRvIII status was unchanged at recurrence in 35 of 40 patients with EGFR -amplified primary tumors (87.5%). Four patients lost and one patient gained EGFRvIII positivity at recurrence. None of 33 EGFR- nonamplified glioblastomas acquired EGFR amplification or EGFRvIII at recurrence. EGFR SNVs were frequent in EGFR -amplified tumors, but were not linked to survival. Conclusions: EGFRvIII and EGFR SNVs are not prognostic in EGFR -amplified glioblastoma patients. EGFR amplification is retained in recurrent glioblastomas. Most EGFRvIII-positive glioblastomas maintain EGFRvIII positivity at recurrence. However, EGFRvIII expression may change in a subset of patients at recurrence, thus repeated biopsy with reassessment of EGFRvIII status is recommended for patients with recurrent glioblastoma to receive EGFRvIII-targeting agents. Clin Cancer Res; 23(22); 6846-55. ©2017 AACR . ©2017 American Association for Cancer Research.

  5. Formation constants of Sm(III), Dy(III), Gd(III), Pr(III) and Nd(III) complexes of tridentate schiff base, 2-[(1H-benzimidazol-2-yl-methylene) amino] phenol

    International Nuclear Information System (INIS)

    Omprakash, K.L.; Chandra Pal, A.V.; Reddy, M.L.N.

    1982-01-01

    A new tridentate schiff base, 2- (1H-benzimidazol-2-yl-methylene)amino phenol derived from benzimididazole-2-carbo-xaldehyde and 2-aminophenol has been synthesised and characterised by spectral and analytical data. Proton-ligand formation constants of the schiff base and metal-ligand formation constants of its complexes with Sm(III), Dy(III), Gd(III), Nd(III) and Pr(III) have been determined potentiometrically in 50% (v/v) aqueous dioxane at an ionic strength of 0.1M (NaClO 4 ) and at 25deg C using the Irving-Rossotti titration technique. The order of stability constants (logβ 2 ) is found to be Sm(III)>Dy(III)>Gd(III)>Pr(III)>Nd(III). (author)

  6. Formation constants of Sm(III), Dy(III), Gd(III), Pr(III) and Nd(III) complexes of tridentate schiff base, 2-((1H-benzimidazol-2-yl-methylene) amino) phenol

    Energy Technology Data Exchange (ETDEWEB)

    Omprakash, K L; Chandra Pal, A V; Reddy, M L.N. [Osmania Univ., Hyderabad (India). Dept. of Chemistry

    1982-03-01

    A new tridentate schiff base, 2- (1H-benzimidazol-2-yl-methylene)amino phenol derived from benzimididazole-2-carbo-xaldehyde and 2-aminophenol has been synthesised and characterised by spectral and analytical data. Proton-ligand formation constants of the schiff base and metal-ligand formation constants of its complexes with Sm(III), Dy(III), Gd(III), Nd(III) and Pr(III) have been determined potentiometrically in 50% (v/v) aqueous dioxane at an ionic strength of 0.1M (NaClO/sub 4/) and at 25deg C using the Irving-Rossotti titration technique. The order of stability constants (log..beta../sub 2/) is found to be Sm(III)>Dy(III)>Gd(III)>Pr(III)>Nd(III).

  7. Una plataforma multiagente para la búsqueda de recursos educacionales considerando aspectos culturales

    Directory of Open Access Journals (Sweden)

    Bender, Cristina

    2006-01-01

    Full Text Available En este trabajo se propone una arquitectura multiagente para la recuperación de recursos educacionales, que ayude a los usuarios a encontrar cursos que se adecuen a sus características personales y aspectos culturales. En este trabajo, se considera como aspectos culturales a las características que permiten distinguir las preferencias de estudiantes pertenecientes a distintas regiones geográficas. La plataforma multiagente planteada incluye varios tipos de agentes que tienen funcionalidades diferentes. En particular, se modela el Educational Resources Finder Agent como un agente BDI Graduado. Este agente se encarga de la recuperación de los mejores cursos de acuerdo al perfil de cada estudiante. Se describe el sistema multiagente completo y se presenta un ejemplo ilustrativo del proceso de búsqueda.

  8. ASPECTOS AMBIENTALES EN LA EXPERIMENTACIÓN QUÍMICA PARA PREVENIR RIESGOS A LA SALUD Y AL AMBIENTE

    Directory of Open Access Journals (Sweden)

    María O. Peña O.

    2011-01-01

    Full Text Available Un aspecto ambiental se considera como cualquier material o elemento físico o químico que el hombre arroja al agua, al aire y al suelo o que interactúe con el ambiente y propicie un riesgo para la salud y para el medio ambiente. Los residuos originados durante el desarrollo de actividades relacionadas con la experimentación química, aunque en una proporción menor que en un proceso industrial, ellos pueden ser residuos peligrosos al medio ambiente. Los aspectos ambientales se asocian con las actividades de generación de residuos, derrames, emisión a la atmósfera, el consumo de recursos naturales y ruido. Este estudio tuvo como objetivo proponer directrices para identificar y clasificar a los residuos que son generados en una experimentación química e introducir aspectos de seguridad para la salud y para el medio ambiente dentro de los procedimientos analíticos. Se inició con una evaluación diagnóstica sobre el conocimiento de la normativa en materia de gestión de los residuos o desechos, dirigida a técnicos y profesores que realizan actividades en ocho laboratorios para la enseñanza de la Química. Se siguió con la selección de un procedimiento analítico, como caso estudio, para revisar y aplicar estrategias de reusar, reciclar y reducir la generación de los residuos. Se encontró un desconocimiento de la normativa ambiental, representada por el 73% de los encuestados y un escaso tratamiento de residuos. Se concluye que la extensión de aspectos ambientales en los procedimientos analíticos puede ayudar a prevenir la contaminación ambiental, a fortalecer aspectos toxicológicos, de seguridad y de prevención de riesgos laborales.

  9. LABORATORIO DE HORMONAS: ASPECTOS PRÁCTICOS

    Directory of Open Access Journals (Sweden)

    René E. Díaz T., DR.

    2015-11-01

    Full Text Available Las técnicas de laboratorio de análisis hormonales han experimentado grandes progresos en las últimas décadas, actualmente se pueden realizar determinaciones hormonales con gran precisión y automatización, sin embargo, existen muchos elementos que es necesario tener en consideración al momento de interpretar un examen hormonal. El elegir el examen adecuado para la condición que estamos estudiando, el conocer sus limitaciones y potenciales falsos positivos y negativos es parte del conocimiento que es fundamental tener como clínicos. En este artículo se pretende entregar una breve revisión de las principales determinaciones hormonales, orientado a aspectos que puedan ser de utilidad al médico no especialista en su práctica clínica.

  10. Spectrophotometric and pH-Metric Studies of Ce(III, Dy(III, Gd(III,Yb(III and Pr(III Metal Complexes with Rifampicin

    Directory of Open Access Journals (Sweden)

    A. N. Sonar

    2011-01-01

    Full Text Available The metal-ligand and proton-ligand stability constant of Ce(III, Dy(III, Gd(III,Yb(III and Pr(III metals with substituted heterocyclic drug (Rifampicin were determined at various ionic strength by pH metric titration. NaClO4 was used to maintain ionic strength of solution. The results obtained were extrapolated to the zero ionic strength using an equation with one individual parameter. The thermodynamic stability constant of the complexes were also calculated. The formation of complexes has been studied by Job’s method. The results obtained were of stability constants by pH metric method is confirmed by Job’s method.

  11. Complexes of lanthanum(III), cerium(III), samarium(III) and dysprosium(III) with substituted piperidines

    Energy Technology Data Exchange (ETDEWEB)

    Manhas, B S; Trikha, A K; Singh, H; Chander, M

    1983-11-01

    Complexes of the general formulae M/sub 2/Cl/sub 6/(L)/sub 3/.C/sub 2/H/sub 5/OH and M/sub 2/(NO/sub 3/)/sub 6/(L)/sub 2/.CH/sub 3/OH have been synthesised by the reactions of chlorides and nitrates of La(III), Ce(III), Sm(III) and Dy(III) with 2-methylpiperidine, 3-methylpiperidine and 4-methylpiperidine. These complexes have been characterised on the basis of their elemental analysis, and IR and electronic reflectance spectra. IR spectral data indicate the presence of coordinated ethanol and methanol molecules and bidentate nitrate groups. Coordination numbers of the metal ions vary from 5 to 8. 19 refs.

  12. Spectroscopic investigations on the complexation of Cm(III) and Eu(III) with organic model ligands and their binding mode in human urine (in vitro); Spektroskopische Untersuchungen zur Komplexbildung von Cm(III) und Eu(III) mit organischen Modellliganden sowie ihrer chemischen Bindungsform in menschlichem Urin (in vitro)

    Energy Technology Data Exchange (ETDEWEB)

    Heller, Anne

    2011-10-26

    In case of incorporation, trivalent actinides (An(III)) and lanthanides (Ln(III)) pose a serious health risk to humans. An(III) are artificial, highly radioactive elements which are mainly produced during the nuclear fuel cycle in nuclear power plants. Via hazardous accidents or nonprofessional storage of radioactive waste, they can be released in the environment and enter the human food chain. In contrast, Ln(III) are nonradioactive, naturally occurring elements with multiple applications in technique and medicine. Consequently it is possible that humans get in contact and incorporate both, An(III) and Ln(III). Therefore, it is of particular importance to elucidate the behaviour of these elements in the human body. While macroscopic processes such as distribution, accumulation and excretion are studied quite well, knowledge about the chemical binding form (speciation) of An(III) and Ln(III) in various body fluids is still sparse. In the present work, for the first time, the speciation of Cm(III) and Eu(III) in natural human urine (in vitro) has been investigated spectroscopically and the formed complex identified. For this purpose, also basic investigations on the complex formation of Cm(III) and Eu(III) in synthetic model urine as well as with the urinary relevant, organic model ligands urea, alanine, phenylalanine, threonine and citrate have been performed and the previously unknown complex stability constants determined. Finally, all experimental results were compared to literature data and predictions calculated by thermodynamic modelling. Since both, Cm(III) and Eu(III), exhibit unique luminescence properties, particularly the suitability of time-resolved laser-induced fluorescence spectroscopy (TRLFS) could be demonstrated as a method to investigate these metal ions in untreated, complex biofluids. The results of this work provide new scientific findings on the biochemical reactions of An(III) and Ln(III) in human body fluids on a molecular scale and

  13. Aspectos podológicos en la Encuesta Nacional de Salud

    Directory of Open Access Journals (Sweden)

    Antonio Martínez Sabater

    Full Text Available Objetivo: la Encuesta Nacional de Salud (ENS es el instrumento para detectar el nivel de salud de la población, por lo que se plantea como objetivo el análisis de las diferentes ediciones para valorar la presencia de los aspectos podológicos y de la figura del profesional de podología en la atención a las personas mayores. Metodología: se ha realizado un análisis de contenido de las diferentes ENS tras la recopilación de las diferentes ediciones (8. Después de la lectura en profundidad y análisis por parte de dos investigadores, se han cumplimentado las fichas de análisis y se han categorizado los diferentes transcriptores, y se ha realizado el análisis e interpretación de la información encontrada. Resultados: en las diferentes ediciones no aparece ninguna mención a la profesión de podología; sí que aparecen referencias a otras figuras como naturópatas, quiroprácticos, entre otros. En relación con los descriptores sobre las afecciones de los pies, solo aparece una referencia en la edición de 1987. No obstante, la referencia a aspectos podológicos es prácticamente inexistente. Conclusiones: la ENS es el instrumento básico para conocer el estado de salud de la población general, pero presenta limitaciones al omitir los aspectos podológicos que suponen una merma en el diagnóstico de las necesidades y, por consiguiente, en la calidad de vida de las personas, principalmente mayores. Al igual que ocurre con la cartera de servicios del SNS, obvia a los/as profesionales formados para la atención básica de los problemas podológicos en el equipo de salud.

  14. Toxicologia do tolueno: aspectos relacionados ao abuso Toluene toxicology: abuse aspects

    Directory of Open Access Journals (Sweden)

    Letícia M.K. Forster

    1994-04-01

    Full Text Available O tolueno está presente em muitos produtos de uso doméstico e industrial e é o principal solvente envolvido no abuso de substâncias e na exposição ocupacional. O problema mais grave no estudo de patologias relacionadas ao tolueno é que este está geralmente associado, em suas preparações comerciais, a outras substâncias. O potencial tóxico do tolueno foi abordado nos seguintes aspectos: parâmetros farmacológicos; características físico-químicas; exposição; estudos clínicos; diagnóstico; pesquisa experimental; tolerância e dependência; efeitos agudos e crônicos; neurotoxicidade; teratogenicidade; doenças psiquiátricas; carcinogenicidade e tratamento. Conclui-se ser de grande importância e urgência que se realizem estudos clínicos com amostras maiores para definição mais precisa das conseqüências do uso crônicoToluene, present in many industrial and domestic products, is the main solvent involved in solvent abuse and occupational exposure. The main problem in studying toluene-related pathologies is the fact that it is frequently combined with other substances. This review focuses on its potential toxicity. The following subjects are discussed: pharmacologic parameters; physico-chemical features; exposure; clinical trials; experimental research; diagnosis; tolerance and dependence; acute and chronic effects; neurotoxicity; teratogenicity; psychiatric disorders; carcinogenicity; and treatment. It is concluded that is important more research on larger population samples with a view to better definition of the consequences.of chronic use should be undertaken.

  15. Aspectos psicossociais da homofobia intrafamiliar e saúde de jovens lésbicas e gays

    Directory of Open Access Journals (Sweden)

    Juliana Perucchi

    2014-03-01

    Full Text Available O número de pesquisas sobre diferentes aspectos da homofobia cresceu nos últimos dez anos. Entretanto, há uma carência de estudos que analisem os aspectos psicossociais que envolvem as experiências de jovens lésbicas e gays mediante situações de violência e os desdobramentos destas na sua saúde. O presente artigo busca relatar os resultados de uma pesquisa que objetivou analisar como se constituem as situações de homofobia no âmbito das relações familiares vividas por jovens lésbicas e gays, analisando os aspectos psicossociais dos processos de ruptura ou afastamento temporário ou permanente do vínculo familiar. A hipótese confirmada ao longo desses anos de pesquisa é de que o preconceito se articula no contexto familiar como dispositivo de legitimação da violência e, consequentemente, ocasiona a ruptura do vínculo, o afastamento temporário ou permanente entre jovens lésbicas e gays e seus familiares, levando, muitas vezes, à saída ou à expulsão da casa dos pais em circunstâncias complexas e, frequentemente, dolorosas.

  16. Aspectos éticos da experimentação animal Aspectos éticos de la experimentación animal Ethics and animal experiments

    Directory of Open Access Journals (Sweden)

    Taylor Brandão Schnaider

    2003-04-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: O tema abordado é de suma importância, pois almeja-se que o ser humano atinja seu bem-estar físico, mental, social e espiritual, sem esquecer os sagrados direitos de todos os animais. A maioria dos códigos internacionais que tratam das normas de pesquisa na área da saúde cita que a pesquisa desenvolvida em seres humanos deve estar fundamentada na experimentação prévia realizada em animais, em laboratórios ou em outros fatos científicos. O presente artigo tem por objetivo explanar os aspectos éticos da experimentação animal. CONTEÚDO: Os autores revêem os conceitos de dissertação e tese, tese experimental, ensaio experimental ou experiência piloto e de biotério. A seguir fazem uma retrospectiva histórica acerca da primeira tentativa para se estabelecer normas em relação à pesquisa experimental, ocorrida em meados do século XIX em Londres. É ressaltado que alguns critérios definidos àquela época persistem até o presente. A primeira comissão de ética em pesquisa animal foi criada na Suécia em 1979, e a seguir nos EUA em 1984. No Brasil, os comitês de ética em pesquisa animal foram constituídos a partir da década de noventa. Desde maio de 1979 existe a Lei Federal 6638 que estabelece normas para a prática didático-científica da vivissecção de animais. Essa lei, entretanto, ainda aguarda regulamentação. Além dela, tramitam no Congresso Nacional alguns anteprojetos dispondo sobre o uso de animais para atividades de ensino e pesquisa. Finalmente, são apresentadas na íntegra as normas adotadas pelo Colégio Brasileiro de Experimentação Animal e a Declaração Universal dos Direitos dos Animais. CONCLUSÕES: Os docentes, pós-graduandos, residentes e graduandos de uma Faculdade de Medicina, envolvidos em pesquisas realizadas em animais, devem conhecer os princípios éticos que visam proteger os animais selecionados para a realização de um trabalho científico.JUSTIFICATIVA Y

  17. Inner-sphere and outer-sphere complexes of yttrium(III), lanthanum (III), neodymium(III), terbium(III) and thulium(III) with halide ions in N,N-dimethylformamide

    International Nuclear Information System (INIS)

    Takahashi, Ryouta; Ishiguro, Shin-ichi

    1991-01-01

    The formation of chloro, bromo and iodo complexes of yttrium(III), and bromo and iodo complexes of lanthanum(III), neodymium(III), terbium(III) and thulium(III) has been studied by precise titration calorimetry in N,N-dimethylformamide (DMF) at 25 o C. The formation of [YCl] 2+ , [YCl 2 ] + , [YCl 3 ] and [YCl 4 ] - , and [MBr] 2+ and [MBr 2 ] + (M = Y, La, Nd, Tb, Tm) was revealed, and their formation constants, enthalpies and entropies were determined. It is found that the formation enthalpies change in the sequence ΔH o (Cl) > ΔH o (l), which is unusual for hard metal (III) ions. This implies that, unlike the chloride ion, the bromide ion forms outer-sphere complexes with the lanthanide(III) and yttrium(III) ions in DMF. Evidence for either an inner- or outer-sphere complex was obtained from 89 Y NMR spectra for Y(ClO 4 ) 3 , YCl 3 and YBr 3 DMF solutions at room temperature. (author)

  18. Gas-phase infrared spectrum of phosphorus (III) oxycyanide, OPCN: experimental and theoretical investigations

    Science.gov (United States)

    Allaf, Abdul. W.; Kassem, M.; Alibrahim, M.; Boustani, Ihsan

    1999-03-01

    An attempt was made to observe the gas-phase infrared spectrum of Phosphorus (III) oxycyanide, OPCN for the first time. This molecule was produced by an on-line process using phosphorus (III) oxychloride, OPCl as precursor passed over heated AgCN. The products were characterised by the infrared spectra of their vapours. The low resolution gas-phase Fourier transform infrared spectrum shows two bands centered at 2165 and 1385 cm -1. These bands are assigned to, ν1 (CN stretch) and ν2 (OP stretch), respectively. Ab initio self-consistent-field (SCF) molecular orbital (MO) and Møller-Plesset second order perturbation theory (MP2) calculations were performed to determine the geometry, total energy and vibrational frequencies of OPCN.

  19. El maltrato infantil: aspectos psicológicos y programas de tratamientos

    OpenAIRE

    González Díaz, Adriana

    2013-01-01

    La presente revisión recoge los aspectos psicológicos derivados del maltrato infantil. Expone la tipología, así la evaluación psicológica de los menores en estos casos y las patologías asociadas al maltrato. Finalmente se exponen los principales programas de intervención y tratamiento en estos casos

  20. La obesidad: aspectos psicológicos y conductuales

    OpenAIRE

    Bersh, Sonia

    2006-01-01

    Introducción: La obesidad es un problema médico de creciente gravedad por su morbilidad y su alta y creciente prevalencia. Objetivo: Realizar una revisión actualizada acerca de la obesidad y su tratamiento, con énfasis en los aspectos de mayor interés para la práctica psiquiátrica. Resultados: La obesidad es una enfermedad crónica de difícil manejo y alta tasa de recurrencia, que se asocia con complicaciones médicas graves. Los factores psicológicos y conductuales son muy relevantes en el cur...

  1. ALGUNOS ASPECTOS A CONSIDERAR SOBRE LA SEXUALIDAD DEL ADULTO MAYOR

    Directory of Open Access Journals (Sweden)

    Zoila Edith Hernández Zamora

    2008-12-01

    Full Text Available La presente investigación expone, a partir de una serie de entrevistas realizadas a una muestra de adultos mayores, aspectos relativos a la satisfacción general en la vida, así como las actitudes, conocimientos y prácticas de la sexualidad de un grupo de adultos mayores que asisten regularmente a una estancia diurna de la ciudad de Xalapa, Veracruz, México, misma que fue diseñada especialmente para este grupo etario. Se encontraron diferencias estadísticamente significativas entre la actitud hacia el ejercicio de la sexualidad de las personas mayores entre los hombres y las mujeres de la muestra, y entre .las personas que tienen pareja con relación a las que no tienen; así como que hay una diferencia estadísticamente significativa entre aquellas personas que tiene una o ninguna enfermedad y las que tienen dos o más enfermedades con respecto a su frecuencia de actividad sexual. Es de resaltar la escasez de conocimientos sobre aspectos básicos de la sexualidad que poseen estas personas mayores, lo que hace necesario el establecimiento de programas educativos que incluyan al personal de salud y a los mismos senectos.

  2. ASPECTOS BASICOS DEL DERECHO ADUANERO PARA ESTUDIANTES DE PREGRADO

    OpenAIRE

    Castro Rangel, Jesus David; Garcia Vargas, Kristhell; Sepulveda Mora, Myriam

    2008-01-01

    La presente investigación comprende un estudio en un grado fundamental y a nivel general del Derecho Aduanero y una herramienta pedagógica dirigida a facilitar, a los alumnos de Pregrado de la Universidad Libre de Cúcuta, el entendimiento y aprendizaje de los aspectos básicos del Derecho Aduanero, teniendo en cuenta que Cúcuta es una zona fronteriza. El estudiante a través del presente trabajo encontrará las herramientas que le permitirán ubicarse dentro del contexto aduanero y...

  3. Light-induced reduction of rhodium(III) and palladium(II) on titanium dioxide dispersions and the selective photochemical separation and recovery of gold(III), platinum(IV), and rhodium(III) in chloride media

    Energy Technology Data Exchange (ETDEWEB)

    Borgarello, E.; Serpone, N.; Emo, G.; Harris, R.; Pelizzetti, E.; Minero, C.

    1986-12-03

    Irradiation of aqueous TiO/sub 2/ dispersions containing palladium(II) or rhodium(III) chloride salts with AM1 simulated sunlight leads to the photoreduction of these metals, which are deposited on the semiconductor particle surface. Oxygen is detrimental to the photoreduction of rhodium(III) but not the photoreduction of palladium(II). However, in both cases the reduction process is most efficient if the solution contains CH/sub 3/OH, which acts to scavenge valence band holes of the illuminated TiO/sub 2/ semiconductor. The selective photoreduction and recovery of precious metals from a dilute solution (as might be found in industrial wastes) have been investigated for a mixture of gold(III), platinum(IV), and rhodium(III) chloride salts as a function of various parameters (pH, presence or absence of O/sub 2/, presence or absence of a hole scavenger, and the concentration of the semiconductor). At pH 0, gold is easily separated from platinum and rhodium. The rate of photoreduction of gold(III) on TiO/sub 2/ is nearly independent of the concentration of the semiconductor, under the experimental conditions employed; the limiting rate is 2.7 x 10/sup -7/ M s/sup -1/. The potential utility of this selective photochemical technique is discussed.

  4. Solvent extraction of anionic chelate complexes of lanthanum(III), europium(III), lutetium(III), scandium(III), and indium(III) with 2-thenoyltrifluoroacetone as ion-pairs with tetrabutylammonium ions

    International Nuclear Information System (INIS)

    Noro, Junji; Sekine, Tatsuya.

    1992-01-01

    The solvent extraction of lanthanum(III), europium(III), lutetium(III), scandium(III), and indium(III) in 0.1 mol dm -3 sodium nitrate solutions with 2-thenoyltrifluoroacetone (Htta) in the absence and presence of tetrabutylammonium ions (tba + ) into carbon tetrachloride was measured. The extraction of lanthanum(III), europium(III), and lutetium(III) was greatly enhanced by the addition of tba + ; this could be explained in terms of the extraction of a ternary complex, M(tta) 4 - tba + . However, the extractions of scandium(III) and indium(III) were nearly the same when tba + was added. The data were treated on the basis of the formation equilibrium of the ternary complex from the neutral chelate, M(tta) 3 , with the extracted ion-pairs of the reagents, tta - tba + , in the organic phase. It was concluded that the degree of association of M(tta) 3 with the ion-pair, tta - tba + , is greater in the order La(tta) 3 ≅ Eu(tta) 3 > Lu(tta) 3 , or that the stability of the ternary complex in the organic phase is higher in the order La(tta) 4 - tba + ≅ Eu(tta) 4 - tba + > Lu(tta) 4 - tba + . This is similar to those of adduct metal chelates of Htta with tributylphosphate (TBP) in synergistic extraction systems. (author)

  5. Aspectos moleculares da anemia falciforme

    Directory of Open Access Journals (Sweden)

    Galiza Neto Gentil Claudino de

    2003-01-01

    Full Text Available No presente artigo abordaram-se vários aspectos relacionados à natureza molecular da anemia falciforme, desordem hematológica de caráter hereditário que acomete expressivo número de indivíduos em várias regiões do mundo. As pesquisas realizadas em torno desta patologia da hemácia, ao longo de quase um século, a partir de 1910, cooperaram para a criação de um novo e importante segmento da ciência, denominado biologia molecular. A descoberta dos polimorfismos da mutação (GAT->GTG no gene que codifica a cadeia beta da hemoglobina, originando diferentes haplótipos da doença, permitiu um melhor e mais amplo conhecimento em torno da heterogeneidade clínica nos pacientes falcêmicos. Analisando a hemoglobina na sua estrutura normal e mutante, sua produção e evolução, pode-se ter um entendimento mais completo da fisiopatologia desta doença e da sua complexidade clínica.

  6. Statistical optimization of synthesis procedure and characterization of europium (III) molybdate nano-plates

    Energy Technology Data Exchange (ETDEWEB)

    Pourmortazavi, Seied Mahdi [Malek Ashtar University of Technology, Faculty of Material and Manufacturing Technologies, P. O. Box 16765-3454, Tehran (Iran, Islamic Republic of); Rahimi-Nasrabadi, Mehdi [Imam Hossein University, Nano Science Center, Tehran (Iran, Islamic Republic of); Fazli, Yousef [Islamic Azad University, Department of Chemistry, Faculty of Science, Arak Branch, Arak (Iran, Islamic Republic of); Mohammad-Zadeh, Mohammad [Sabzevar University of Medical Sciences, Department of Physiology and Pharmacology, School of Medicine, Sabzevar (Iran, Islamic Republic of)

    2015-06-15

    Europium (III) molybdate nano-plates were synthesized in this work via chemical precipitation route involving adding of europium (III) ion solution to the aqueous solution of molybdate reagent. Effects of some reaction variables such as concentrations of europium and molybdate ions, flow rate of europium reagent, and reactor temperature on the diameter of the synthesized europium (III) molybdate nano-plates were experimentally investigated by orthogonal array design. The results showed that the size of europium (III) molybdate nano-plates can be optimized by adjusting the concentrations of europium (III) and molybdate ions, as well as the reactional temperature. Europium (III) molybdate nano-plates prepared under the optimum conditions were characterized by X-ray powder diffraction, scanning electron microscopy, and Fourier transform infrared spectroscopy. (orig.)

  7. Aspectos Comportamentais no Julgamento Profissional dos Auditores Independentes

    Directory of Open Access Journals (Sweden)

    José Emerson Firmino

    2013-12-01

    Full Text Available Alguns estudos evidenciam que a adoção das International Financial Reporting Standards (IFRS proporcionou melhorias na qualidade das informações contábeis. Mas, o conjunto de Procedimentos descritos nas IFRSs é fortemente afetado pelo julgamento profissional dos contadores. O mesmo fato ocorre com o auditor, que deve avaliar se a aplicação das normas resulta em fair presentation. Esse julgamento dependerá da interpretação do auditor sobre o nível de probabilidade associada a determinadas expressões presentes no texto das normas contábeis. Alguns autores evidenciam que existem diferenças significativas na interpretação das expressões verbais de probabilidade entre os auditores e que aspectos comportamentais estão influenciando a emissão do parecer de auditoria. Diante desse cenário, o objetivo deste estudo foi investigar como se comportam os auditores no julgamento de situações subjetivas, inseridos em um cenário pessimista ou otimista, no momento da avaliação dos critérios de reconhecimento e/ou mensuração, quando da execução dos trabalhos da auditoria. A amostra desta pesquisa é composta por 258 auditores independentes com registro de responsáveis técnicos junto à Comissão de Valores Mobiliários (CVM. Os resultados obtidos, por intermédio da análise das respostas dos auditores para situações subjetivas, sugerem que o julgamento do auditor em situações de subjetividade é influenciado por aspectos comportamentais, sendo que eles podem apresentar opiniões distintas em seus relatórios.

  8. Effects of ionic strength on the coordination of Eu(III) and Cm(III) to a Gram-negative bacterium, Paracoccus denitrificans

    International Nuclear Information System (INIS)

    Ozaki, T.; Ohnuki, T.; Kimura, T.; Francis, A.J.

    2006-01-01

    We studied the effect of ionic strength on the interactions of Europium(III) and Curium(III) with a Gram-negative bacterium Paracoccus denitrificans. Bacterial cells grown in 0.5-, 3.5-, and 5.0% NaCl were used in adsorption experiments and laser experiments that were performed at the same ionic strengths as those in the original growth media. The distribution ratio (log K d ) for Eu(III) and Cm(III) was determined at pHs 3-5. To elucidate the coordination environment of Eu(III) adsorbed on P. denitrificans, we estimated the number of water molecules in the inner sphere and strength of the ligand field by time-resolved laser-induced fluorescence spectroscopy (TRLFS) at pHs 4-6. The log K d of Eu(III) and Cm(III) increased with an increase of pH at all ionic strengths because there was less competition for ligands in cells with H + at higher pHs, wherein less H + was present in solution: cation adsorption generally occurs through an exchange with H + on the functional groups of coordination sites. No significant differences were observed in the log K d of Eu(III) and Cm(III) at each pH in 0.5-, 3.5-, and 5.0% NaCl solutions, though competition for ligands with Na + would be expected to increase at higher NaCl concentrations. The log K d of Eu(III) was almost equivalent to that of Cm(III) under all the experimental conditions. TRLFS showed that the coordination environments of Eu(III) did not differ from each other at 0.5-, 3.5-, and 5.0% NaCl at pHs 4-6. TRLFS also showed that the characteristic of the coordination environment of Eu(III) on P. denitrificans was similar to that on a halophile, Nesterenkonia halobia, while it significantly differed from that on a non-halophile, Pseudomonas putida. These findings indicate that the number of coordination sites for Eu(III) on P. denitrificans, whose cell surface may have similar structures to that of halophiles, increased with increasing ionic strength, though their structure remained unchanged. (orig.)

  9. Adsorption of Cr(III) from Aqueous Solution using Borax Sludge.

    Science.gov (United States)

    Senberber, Fatma Tugce; Yildirim, Meral; Mermer, Nevin Karamahmut; Derun, Emek Moroydor

    2017-09-01

    Borax sludge is the waste produced by a trommel sieve in the borax production process and is used as an adsorbent for Cr(III) removal. The effects of various parameters, including pH, initial Cr(III) concentration and contact time were investigated for batch adsorption of Cr(III). The experimental results obtained were applied to different adsorption isotherms and kinetic models. The results indicated that the Temkin isotherm (R2 = 0.9749) was most suitable to explain the adsorption characteristics of borax sludge, and the removal of Cr(III) was achieved by a physisorption process. The overall kinetic data fitted the pseudo-second order rate model (R2 = 0.9990). According to thermodynamic studies, which were carried out at different temperatures, changes in enthalpy (ΔH) and entropy (ΔS) values for Cr(III) adsorption by borax sludge were determined to be 69.395 kJ/mol and 0.276 kJ/mol K, respectively. The study implied that borax sludge could be used as an alternative adsorbent in the adsorption of Cr(III) from aqueous solutions.

  10. Sparkle/PM3 for the modeling of europium(III), gadolinium(III), and terbium(III) complexes

    International Nuclear Information System (INIS)

    Freire, Ricardo O.; Rocha, Gerd B.; Simas, Alfredo M.

    2009-01-01

    The Sparkle/PM3 model is extended to europium(III), gadolinium(III), and terbium(III) complexes. The validation procedure was carried out using only high quality crystallographic structures, for a total of ninety-six Eu(III) complexes, seventy Gd(III) complexes, and forty-two Tb(III) complexes. The Sparkle/PM3 unsigned mean error, for all interatomic distances between the trivalent lanthanide ion and the ligand atoms of the first sphere of coordination, is: 0.080 A for Eu(III); 0.063 A for Gd(III); and 0.070 A for Tb(III). These figures are similar to the Sparkle/AM1 ones of 0.082 A, 0.061 A, and 0.068 A respectively, indicating they are all comparable parameterizations. Moreover, their accuracy is similar to what can be obtained by present-day ab initio effective core potential full geometry optimization calculations on such lanthanide complexes. Finally, we report a preliminary attempt to show that Sparkle/PM3 geometry predictions are reliable. For one of the Eu(III) complexes, BAFZEO, we created hundreds of different input geometries by randomly varying the distances and angles of the ligands to the central Eu(III) ion, which were all subsequently fully optimized. A significant trend was unveiled, indicating that more accurate local minima geometries cluster at lower total energies, thus reinforcing the validity of sparkle model calculations. (author)

  11. ASPECTOS BIOLÓGICOS DAS PRINCIPAIS AMEBAS DE VIDA-LIVRE DE IMPORTÂNCIA MÉDICA

    Directory of Open Access Journals (Sweden)

    Paulo Henrique Matayoshi Calixto

    2014-08-01

    Full Text Available O objetivo desta revisão é de compilar informações sobre os principais aspectos das amebas de vida-livre (AVL. Para tal, foram consultados artigos depositados no PubMed, entre os anos de 1947 a 2014. As AVL são protozoários amplamente distribuídos no ambiente. Apesar de não serem considerados parasitos clássicos, tais como o Trypanosoma cruzi, as AVL são responsáveis por infecções oportunistas e não oportunistas em seres humanos e animais. Entre todas as AVL, apenas três gêneros são conhecidamente capazes de infectar o homem e outros animais, são eles Balamuthia, Naegleria e Acanthamoeba. Felizmente, as infecções por AVL são extremamente raras. Espécies desses gêneros são responsáveis por infecções fatais, tais como: i Acanthamoeba causa a encefalite amebiana granulomatosa (EAG, além de causar ceratites e infecções de pele, rins e pulmões; ii Balamuthia mandrillaris também provoca o mesmo tipo de encefalite; iii Naegleria fowleri é o agente etiológico da meningoencefalite amebiana primária (MAP. Palavras-chave: Amebas de vida-livre; Balamuthia mandrillaris; Naegleria fowleri; Acanthamoeba spp.; encefalite amebiana. DOI: http://dx.doi.org/10.18561/2179-5746/biotaamazonia.v4n2p124-129

  12. SORPTION OF Au(III BY Saccharomyces cerevisiae BIOMASS

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    Amaria Amaria

    2010-07-01

    Full Text Available Au(III sorption by S. cerevisiae biomass extracted from beer waste industry was investigated. Experimentally, the sorption was conducted in batch method. This research involved five steps: 1 identification the functional groups present in the S. cerevisiae biomass by infrared spectroscopic technique, 2 determination of optimum pH, 3 determination of the sorption capacity and energy, 4 determination of the sorption type by conducting desorption of sorbed Au(III using specific eluents having different desorption capacity such as H2O (van der Waals, KNO3 (ion exchange, HNO3 (hydrogen bond, and tiourea (coordination bond, 5 determination of effective eluents in Au(III desorption by partial desorption of sorbed Au(III using thiourea, NaCN and KI. The remaining Au(III concentrations in filtrate were analyzed using Atomic Absorption Spectrophotometer. The results showed that: 1 Functional groups of S. cerevisiae biomass that involved in the sorption processes were hydroxyl (-OH, carboxylate (-COO- and amine (-NH2, 2 maximum sorption was occurred at pH 4, equal to 98.19% of total sorption, 3 The sorption capacity of biomass was 133.33 mg/g (6.7682E-04 mol/g and was involved sorption energy 23.03 kJ mol-1, 4 Sorption type was dominated by coordination bond, 5 NaCN was effective eluent to strip Au(III close to 100%.   Keywords: sorption, desorption, S. cerevisiae biomass, Au(III

  13. Aspectos motivacionais e afetivos na mediação de professores alfabetizadores

    Directory of Open Access Journals (Sweden)

    Azevedo, Cleomar

    2010-01-01

    Full Text Available Este artigo é o resultado de uma pesquisa que parte da seguinte questão: o que diferencia o professor que obtém sucesso no processo de alfabetização? Levanto a hipótese que na mediação os aspectos motivacionais e afetivos são componentes que se fazem presente na atuação desses professores alfabetizadores. O objetivo desta pesquisa foi o de levantar os aspectos motivacionais e afetivos na mediação do processo de alfabetização, através da fala de professores alfabetizadores. Foram entrevistados 18 professores com a premissa de serem bons alfabetizadores. Investigar o que mobiliza e caracteriza a ação dos docentes, que mesmo possuindo inúmeras variáveis que interfiram negativamente nesse processo, conseguem obter êxito no desenvolvimento da alfabetização de seus alunos é uma possibilidade de levantar questões voltadas à problemática da aprendizagem do processo de alfabetização

  14. MCMI-III Grossman personality facets among partner-violent men in prison

    Directory of Open Access Journals (Sweden)

    Ismael Loinaz

    2012-01-01

    Full Text Available La personalidad es uno de los aspectos más importantes y complejos en la evaluación del comportamiento violento. Investigaciones recientes sobre violencia contra la pareja destacan la necesidad de describir tipologías de agresores con el objetivo de poder adaptar las intervenciones psicológicas. El Inventario Clínico Multiaxial de Millon (MCMI-III es un instrumento de elección en el contexto clínico-forense y las facetas de Grossman son la última aportación internacional a esta herramienta. Estas permiten un diagnóstico más molecular y pueden proporcionar una mayor capacidad predictiva de la violencia. El presente estudio examina las facetas de Grossman del MCMI-III en 175 agresores de pareja en prisión. Los resultados sugieren la existencia de tres perfiles de personalidad, que difieren en la gravedad de su sintomatología, de menor (grupo 1; 27% a mayor patología (Grupo 3; 30%. El grupo 3 muestra alteraciones relacionadas con facetas paranoides, sádicas, antisociales, negativistas y límites, todas ellas relacionadas con el comportamiento violento. Este grupo muestra significativamente más violencia psicológica y coerción sexual menor (autoinformada en la Conflict Tactis Scales, CTS-2 pero no se dan diferencias respecto a la violencia física. Se discute la utilidad de las facetas de la personalidad para la intervención en la violencia de pareja.

  15. Satisfacción con el aspecto dental general y tratamientos deseados en estudiantes universitarios

    Directory of Open Access Journals (Sweden)

    Clarisse Virginia Díaz Reissner

    2015-08-01

    Full Text Available La apariencia dental es considerada un componente de la belleza facial, que al ser restaurada por el odontólogo, podría influir con un efecto positivo en la valoración personal y la calidad de vida. El objetivo del estudio fue determinar la satisfacción general con la apariencia dental en estudiantes de las carreras de Artes Visuales y Diseño de Indumentaria del Instituto Superior de Arte de la Facultad de Arquitectura Diseño y Arte de la Universidad Nacional de Asunción, matriculados en el 2014. Se aplicó un cuestionario que contenía preguntas sobre datos demográficos, satisfacción con el aspecto dental general y con diversos aspectos dentales, así como también sobre el tratamiento estético deseado. La muestra quedó conformada por 108 estudiantes, que corresponde al 49,1% de la población. Se observó que el 48,2% se encontraba insatisfecho con el aspecto general de sus dientes, siendo los tratamientos de elección: blanqueamiento (63,9% y ortodoncia (47,2%. Los factores predisponentes a la insatisfacción fueron residir en Gran Asunción e interior del país y percibir sus dientes como desalineados. Por otro lado, favoreció la satisfacción el haberse sentirse a gusto con el color de sus dientes.

  16. Evidence of Type-II Band Alignment in III-nitride Semiconductors: Experimental and theoretical investigation for In0.17Al0.83N/GaN heterostructures

    Science.gov (United States)

    Wang, Jiaming; Xu, Fujun; Zhang, Xia; An, Wei; Li, Xin-Zheng; Song, Jie; Ge, Weikun; Tian, Guangshan; Lu, Jing; Wang, Xinqiang; Tang, Ning; Yang, Zhijian; Li, Wei; Wang, Weiying; Jin, Peng; Chen, Yonghai; Shen, Bo

    2014-01-01

    Type-II band alignment structure is coveted in the design of photovoltaic devices and detectors, since it is beneficial for the transport of photogenerated carriers. Regrettably, for group-III-nitride wide bandgap semiconductors, all existing devices are limited to type-I heterostructures, owing to the unavailable of type-II ones. This seriously restricts the designing flexibility for optoelectronic devices and consequently the relevant performance of this material system. Here we show a brandnew type-II band alignment of the lattice-matched In0.17Al0.83N/GaN heterostructure from the perspective of both experimental observations and first-principle theoretical calculations. The band discontinuity is dominated by the conduction band offset ΔEC, with a small contribution from the valence band offset ΔEV which equals 0.1 eV (with being above). Our work may open up new prospects to realize high-performance III-Nitrides optoelectronic devices based on type-II energy band engineering. PMID:25283334

  17. Experimental and Computational Evidence for the Mechanism of Intradiol Catechol Dioxygenation by Non-Heme Iron(III) Complexes

    Science.gov (United States)

    Jastrzebski, Robin; Quesne, Matthew G; Weckhuysen, Bert M; de Visser, Sam P; Bruijnincx, Pieter C A

    2014-01-01

    Catechol intradiol dioxygenation is a unique reaction catalyzed by iron-dependent enzymes and non-heme iron(III) complexes. The mechanism by which these systems activate dioxygen in this important metabolic process remains controversial. Using a combination of kinetic measurements and computational modelling of multiple iron(III) catecholato complexes, we have elucidated the catechol cleavage mechanism and show that oxygen binds the iron center by partial dissociation of the substrate from the iron complex. The iron(III) superoxide complex that is formed subsequently attacks the carbon atom of the substrate by a rate-determining C=O bond formation step. PMID:25322920

  18. Uranium (III)-Plutonium (III) co-precipitation in molten chloride

    Science.gov (United States)

    Vigier, Jean-François; Laplace, Annabelle; Renard, Catherine; Miguirditchian, Manuel; Abraham, Francis

    2018-02-01

    Co-management of the actinides in an integrated closed fuel cycle by a pyrochemical process is studied at the laboratory scale in France in the CEA-ATALANTE facility. In this context the co-precipitation of U(III) and Pu(III) by wet argon sparging in LiCl-CaCl2 (30-70 mol%) molten salt at 705 °C is studied. Pu(III) is prepared in situ in the molten salt by carbochlorination of PuO2 and U(III) is then introduced as UCl3 after chlorine purge by argon to avoid any oxidation of uranium up to U(VI) by Cl2. The oxide conversion yield through wet argon sparging is quantitative. However, the preferential oxidation of U(III) in comparison to Pu(III) is responsible for a successive conversion of the two actinides, giving a mixture of UO2 and PuO2 oxides. Surprisingly, the conversion of sole Pu(III) in the same conditions leads to a mixture of PuO2 and PuOCl, characteristic of a partial oxidation of Pu(III) to Pu(IV). This is in contrast with coconversion of U(III)-Pu(III) mixtures but in agreement with the conversion of Ce(III).

  19. Benign childhood epilepsy with centro-temporal spikes: correlation between clinical, cognitive and EEG aspects Epilepsia benigna da infância com pontas centrotemporais: correlação entre aspectos clínicos, eletrencefalográficos e cognitivos

    Directory of Open Access Journals (Sweden)

    Lineu Corrêa Fonseca

    2007-09-01

    Full Text Available Benign childhood epilepsy with centro-temporal spikes (BECTS is a form of epilepsy with no demonstrable anatomical lesion showing spontaneous seizure remission. During the active phase of the disease the children may show cognitive deficits. The objective of this study was to assess, in children with BECTS, the relationship between clinical-EEG aspects and performance in the school performance test (SPT, Raven's progressive matrixes test and the Wechsler Intelligence Scale for Children (WISC-III. Forty-two 7 to 11 year old children were included and the following tests carried out: anamnesis, neurological examination, electroencephalogram (EEG, SPT, Raven's test and WISC-III. The children with BECTS had normal IQ values but showed inferior performance in the SPT more frequently than "healthy" children, paired with respect to age and maternal scholastic level. There was moderate positive correlation between WISC-III results and the age when the seizures started and the educational level of the parents. On the other hand, aspects linked to the epileptic nature of BECTS, such as the number of seizures, time since last seizure and the number and lateralization of the centro-temporal spikes on the EEG, showed no correlation with the neuropsychological tests.A epilepsia benigna da infância com pontas centrotemporais (EBICT é uma forma de epilepsia na qual não existem lesões anatômicas demonstráveis e há remissão espontânea das crises. Na fase ativa da epilepsia as crianças podem apresentar déficits cognitivos. O objetivo deste estudo foi avaliar, em crianças com EBICT, a relação entre aspectos clínico-eletrencefalográficos e o desempenho no teste de desempenho escolar (TDE, no teste das matrizes progressivas de Raven e na Escala Wechsler de Inteligência para Crianças (WISC-III. Foram incluídas 42 crianças de 7 a 11 anos de idade. Foram realizados: anamnese, exame neurológico, eletrencefalograma (EEG, TDE, teste de Raven e WISC-III

  20. Atitudes frente a aspectos relevantes da prática médica: estudo transversal randomizado com alunos de segundo e sexto anos

    Directory of Open Access Journals (Sweden)

    Adriana Rainha Mascia

    Full Text Available Estudo transversal com duas amostras randomizadas de 50 alunos do segundo e 50 do sexto ano de graduação em Medicina. Foi aplicado um questionário com questões abertas e a escala "Instrumento de avaliação de atitudes de estudantes de medicina frente a aspectos relevantes da prática médica" (Colares, 2002. A escala contém 52 questões referentes à: 1. Aspectos psicológicos e emocionais nas doenças orgânicas e mentais; 2. Manejo de situações relacionadas à morte; 3. Atenção primária à saúde; 4. Aspectos relacionados à doença mental; 5. Contribuição do médico ao avanço científico da medicina; 6. Outros aspectos relacionados à atuação médica e às políticas de saúde. As atitudes são categorizadas em positivas, negativas e conflitantes. Observou-se que os estudantes apresentaram atitudes positivas frente a pelo menos três dos seis aspectos abordados; os alunos do segundo ano e do sexto ano apresentaram diferença estatisticamente significativa (chi² = 6,901, g.l. = 1, p < 0,05 nas atitudes relacionadas ao fator 2 (manejo de situações relacionadas à morte.

  1. Oxidation of Ce(III) in Foam Decontaminant by Ozone

    Energy Technology Data Exchange (ETDEWEB)

    Jung, Chong Hun; Yoon, I. H.; Choi, W. K.; Moon, J. K.; Yang, H. B. [Korea Atomic Energy Research Institute, Daejeon (Korea, Republic of); Lee, J. S. [Gachon University, Seongnam (Korea, Republic of)

    2016-10-15

    A nanoparticle-based foam decontaminant is composed of a surfactant and nanoparticles for the generation and maintenance of foam, and a chemical decontamination agent made of Ce(IV) dissolved in nitric acid. Ce(IV) will be reduced to Ce(III) through the decontamination process. Oxidizing cerium(III) can be reused as a decontamination agent, Ce(IV). Oxidation treatment technology by ozone uses its strong oxidizing power. It can be regarded as an environmentally friendly process, because ozone cannot be stored and transported like other industrial gases (because it quickly decays into diatomic oxygen) and must therefore be produced on site, and used ozone can decompose immediately. The ozonation treatment of Ce(III) in foam decontaminant containing a surfactant is necessary for the effective regeneration of Ce(III). Thus, the present study was undertaken to determine the optimal conditions for ozonation treatment in the regeneration of Ce(III) into Ce(IV) in the nanoparticle-based foam decontaminant containing surfactant. This study was undertaken to determine the optimal conditions for ozonation treatment in the regeneration of Ce(III) to Ce(IV) in nanoparticle-based foam decontaminant containing a TBS surfactant. The oxidation conversion rate of Ce(III) was increased with an increase in the flow rate of the gas mixture and ozone injection amount. The oxidation time required for the 100% oxidation conversion of Ce(III) to Ce(IV) at a specific ozone injection amount can be predicted from these experimental data.

  2. Oxidation of Ce(III) in Foam Decontaminant by Ozone

    International Nuclear Information System (INIS)

    Jung, Chong Hun; Yoon, I. H.; Choi, W. K.; Moon, J. K.; Yang, H. B.; Lee, J. S.

    2016-01-01

    A nanoparticle-based foam decontaminant is composed of a surfactant and nanoparticles for the generation and maintenance of foam, and a chemical decontamination agent made of Ce(IV) dissolved in nitric acid. Ce(IV) will be reduced to Ce(III) through the decontamination process. Oxidizing cerium(III) can be reused as a decontamination agent, Ce(IV). Oxidation treatment technology by ozone uses its strong oxidizing power. It can be regarded as an environmentally friendly process, because ozone cannot be stored and transported like other industrial gases (because it quickly decays into diatomic oxygen) and must therefore be produced on site, and used ozone can decompose immediately. The ozonation treatment of Ce(III) in foam decontaminant containing a surfactant is necessary for the effective regeneration of Ce(III). Thus, the present study was undertaken to determine the optimal conditions for ozonation treatment in the regeneration of Ce(III) into Ce(IV) in the nanoparticle-based foam decontaminant containing surfactant. This study was undertaken to determine the optimal conditions for ozonation treatment in the regeneration of Ce(III) to Ce(IV) in nanoparticle-based foam decontaminant containing a TBS surfactant. The oxidation conversion rate of Ce(III) was increased with an increase in the flow rate of the gas mixture and ozone injection amount. The oxidation time required for the 100% oxidation conversion of Ce(III) to Ce(IV) at a specific ozone injection amount can be predicted from these experimental data

  3. Estudo do comportamento de RSU em uma célula experimental e suas correlações com aspectos microbiológicos, físicos e químicos Behavior study of MSW in an experimental cell and its correlations with microbiological, physical and chemical aspects

    Directory of Open Access Journals (Sweden)

    Veruschka Escarião Dessoles Monteiro

    2006-09-01

    Full Text Available Células experimentais (lisímetros possibilitam entender o comportamento de aterros de RSU e representam uma técnica bastante interessante para obter parâmetros de projetos, dimensionamento e construção de aterros, além do mais pode fornecer contribuições na área de saneamento através de monitoramento de processos. O objetivo deste trabalho é avaliar o processo biodegradativo dos resíduos depositados em uma célula experimental correlacionando parâmetros como recalque, temperatura e contagem de microrganismos. O monitoramento mostrou que há uma relação entre estes parâmetros. Verificou-se que a temperatura no lisímetro variou no decorrer do processo possivelmente devido às mudanças de fases de decomposição dos resíduos. Os estudos vislumbram uma nova abordagem para recalques em RSU mostrando a ocorrência de três fazes distintas de deformações verticais e a íntima ligação de processos biodegradativos e aspectos mecânicos.Experimental cells (lysimeters make possible to understand the landfill behavior of MSW and represent a very interesting technique for the obtainment of projects parameters, design and constructions of landfills. Besides that, they provide contributions to the sanitation area through processes monitoring. The purpose of this paper is to evaluate the solid waste biodegradation process deposited in an experimental cell correlating parameters like settlement, temperature and microorganisms counting. The monitoring showed that there is a relation between these parameters. It was observed that the temperature in the lysimeter varied in the course of the process, possibly because of the changes in the stages of the solid waste decomposition. The studies descry a new approach to settlements in MSW showing that there are three different stages of vertical deformations and the close connection of biodegradation processes and mechanical aspects.

  4. Direito a moradia e inclusão social: aspectos positivos e negativos do "programa minha casa minha vida"

    OpenAIRE

    Desordi, Jordana Laís; Strücker, Bianca

    2016-01-01

    O presente artigo pretende analisar aspectos conceituais e doutrinários referentes ao direito à moradia e à inclusão social, fazendo referência aos aspectos positivos e negativos do programa habitacional brasileiro “Minha Casa Minha Vida” (PMCMV). A pesquisa dá ênfase ao PMCMV, momento em que é analisada a legislação que cria e institui o Programa em suas duas versões existentes até este momento. Destaca-se, ainda, os reflexos que o programa causou ao proporcionar o acesso do indivíduo a sua ...

  5. A import??ncia dos aspectos psicomotores na educa????o infantil

    OpenAIRE

    Silva, ??talo Cardoso Barreto da

    2016-01-01

    Introdu????o: Os aspectos psicomotores proporcionam atribui????es significativas para o desenvolvimento do aluno e pode ainda contribuir para sua evolu????o cognitiva, o tornando h??bil para realiza????o de diferentes movimentos. A educa????o f??sica escolar tem o poder de criar, estimular uma ampla gama de a????es motoras, novas viv??ncias que iriam estimular e desenvolver as crian??as. Criando tamb??m a capacidade de inclus??o, diversidade, respeito entre elas e quem as cerca. Objetivo: O p...

  6. Synthesis, structural characterization, luminescent properties and theoretical study of three novel lanthanide metal-organic frameworks of Ho(III), Gd(III) and Eu(III) with 2,5-thiophenedicarboxylate anion

    Energy Technology Data Exchange (ETDEWEB)

    Marques, Lippy F. [Instituto de Química, Universidade do Estado do Rio de Janeiro, Rio de Janeiro 20550-013 (Brazil); Correa, Charlane C. [Departamento de Química-ICE, Universidade Federal de Juiz de Fora, Juiz de Fora-MG, 36036-330 (Brazil); Ribeiro, Sidney J.L.; Santos, Molíria V. dos [Institute of Chemistry, São Paulo State University − UNESP, CP 355 Araraquara-SP 14801-970 Brazil (Brazil); Dutra, José Diogo L.; Freire, Ricardo O. [Pople Computational Chemistry Laboratory, Departamento de Química, Universidade Federal de Sergipe, São Cristóvão-SE 49100-000 (Brazil); Machado, Flávia C., E-mail: flavia.machado@ufjf.edu.br [Departamento de Química-ICE, Universidade Federal de Juiz de Fora, Juiz de Fora-MG, 36036-330 (Brazil)

    2015-07-15

    In this paper, the synthesis of three new metal-organic frameworks of lanthanides (LnMOFs) ([Ln{sub 2}(2,5-tdc){sub 3}(dmso){sub 2}]·H{sub 2}O){sub n} (Ln=Ho (1); Gd (2); Eu (3); 2,5-tdc=2,5-thiophenedicarboxylate anion; dmso=dimethylsulfoxide), and their complete characterization, including single crystal X-ray diffraction, FTIR spectroscopy and thermogravimetric analysis are reported. In especial, photophysical properties of Eu(III) complex have been studied in detail via both theoretical and experimental approaches. Crystal structure of (1) reveals that each lanthanide ion is seven-coordinated by oxygen atoms in an overall distorted capped trigonal – prismatic geometry. The 2,5-tdc{sup 2−} ligands connect four Ln(III) centers, adopting (κ{sup 1}–κ{sup 1})–(κ{sup 1}–κ{sup 1})–μ{sub 4} coordination mode, generating an 8-connected uninodal 3D network. In addition, theoretical studies for Eu(III) complex were performed using the Sparkle model for lanthanide complexes. - Graphical abstract: Three new metal-organic frameworks of lanthanides (LnMOFs) ([Ln{sub 2}(2,5-tdc){sub 3}(dmso){sub 2}]·H{sub 2}O){sub n} (Ln=Ho (1); Gd (2); Eu (3); 2,5-tdc=2,5-thiophenedicarboxylate anion; dmso=dimethylsulfoxide), were synthesized and their complete characterization, including single crystal X-ray diffraction, FTIR spectroscopy and thermogravimetric analysis are reported. In especial, photophysical properties of Eu(III) complex have been studied in detail via both theoretical and experimental approaches. - Highlights: • Three new LnMOFs were synthesized and fully characterized. • Ho{sup 3+}, Gd{sup 3+} and Eu{sup 3+} complexes photoluminescence properties were investigated. • Theoretical approaches for Eu{sup 3+} complex luminescence has been performed. • An energy level diagram is used to establish the ligand-to-metal energy transfer. • These metal−organic frameworks can act as light conversion molecular devices.

  7. Tillandsia recurvata L. (Bromeliaceae: aspectos farmacognósticos

    Directory of Open Access Journals (Sweden)

    Alex Lucena de Vasconcelos

    2013-01-01

    Full Text Available A cobertura superior das florestas tropicais, formada pelas copas das árvores, constitui um ambiente de extrema diversidade vegetal. Contribuindo com a grande riqueza dessas florestas encontram-se as espécies botânicas epífitas, cuja importância pode ser observada do ponto de vista ecológico, faunístico, etnobotânico e até mesmo farmacológico. Dentre as espécies adaptadas à vida epifítica podemos citar as bromeliáceas, que compõem uma das famílias mais representativas dessa flora com elevada variabilidade genética. Tillandsia recurvata é uma espécie epífita cosmopolita, nativa, adaptada a habitats áridos, utilizada para o tratamento de diversas doenças, mas pouco se tem publicado a respeito das comprovações científicas de suas propriedades. O presente trabalho revisa os aspectos etnofarmacológicos, atividades biológicas e compostos químicos relacionados à espécie em questão, pertencente à Bromeliaceae. A partir do levantamento de dados realizado, observa-se que esta se trata de uma espécie de conhecido uso popular no tratamento de diferentes distúrbios, com alguns estudos farmacológicos que comprovam suas propriedades terapêuticas. Do ponto de vista químico observa-se a presença de terpenos, flavonoides e derivados cinâmicos em sua constituição, em que alguns compostos isolados ilustram a potencialidade desta espécie como fonte de biomoléculas de interesse. Todos estes aspectos considerados nesta revisão contribuem para o conhecimento a respeito da importância biológica e o potencial terapêutico acerca dos metabólitos desta promissora espécie.

  8. Defects and oxidation of group-III monochalcogenide monolayers

    Science.gov (United States)

    Guo, Yu; Zhou, Si; Bai, Yizhen; Zhao, Jijun

    2017-09-01

    Among various two-dimensional (2D) materials, monolayer group-III monochalcogenides (GaS, GaSe, InS, and InSe) stand out owing to their potential applications in microelectronics and optoelectronics. Devices made of these novel 2D materials are sensitive to environmental gases, especially O2 molecules. To address this critical issue, here we systematically investigate the oxidization behaviors of perfect and defective group-III monochalcogenide monolayers by first-principles calculations. The perfect monolayers show superior oxidation resistance with large barriers of 3.02-3.20 eV for the dissociation and chemisorption of O2 molecules. In contrast, the defective monolayers with single chalcogen vacancy are vulnerable to O2, showing small barriers of only 0.26-0.36 eV for the chemisorption of an O2 molecule. Interestingly, filling an O2 molecule to the chalcogen vacancy of group-III monochalcogenide monolayers could preserve the electronic band structure of the perfect system—the bandgaps are almost intact and the carrier effective masses are only moderately disturbed. On the other hand, the defective monolayers with single vacancies of group-III atoms carry local magnetic moments of 1-2 μB. These results help experimental design and synthesis of group-III monochalcogenides based 2D devices with high performance and stability.

  9. Spectroscopic investigations on the complexation of Cm(III) and Eu(III) with organic model ligands and their binding mode in human urine (in vitro)

    International Nuclear Information System (INIS)

    Heller, Anne

    2011-01-01

    In case of incorporation, trivalent actinides (An(III)) and lanthanides (Ln(III)) pose a serious health risk to humans. An(III) are artificial, highly radioactive elements which are mainly produced during the nuclear fuel cycle in nuclear power plants. Via hazardous accidents or nonprofessional storage of radioactive waste, they can be released in the environment and enter the human food chain. In contrast, Ln(III) are nonradioactive, naturally occurring elements with multiple applications in technique and medicine. Consequently it is possible that humans get in contact and incorporate both, An(III) and Ln(III). Therefore, it is of particular importance to elucidate the behaviour of these elements in the human body. While macroscopic processes such as distribution, accumulation and excretion are studied quite well, knowledge about the chemical binding form (speciation) of An(III) and Ln(III) in various body fluids is still sparse. In the present work, for the first time, the speciation of Cm(III) and Eu(III) in natural human urine (in vitro) has been investigated spectroscopically and the formed complex identified. For this purpose, also basic investigations on the complex formation of Cm(III) and Eu(III) in synthetic model urine as well as with the urinary relevant, organic model ligands urea, alanine, phenylalanine, threonine and citrate have been performed and the previously unknown complex stability constants determined. Finally, all experimental results were compared to literature data and predictions calculated by thermodynamic modelling. Since both, Cm(III) and Eu(III), exhibit unique luminescence properties, particularly the suitability of time-resolved laser-induced fluorescence spectroscopy (TRLFS) could be demonstrated as a method to investigate these metal ions in untreated, complex biofluids. The results of this work provide new scientific findings on the biochemical reactions of An(III) and Ln(III) in human body fluids on a molecular scale and

  10. Doublet III: status and future plans

    International Nuclear Information System (INIS)

    Rawls, J.M.

    1980-04-01

    A synopsis is presented of the experimental results from the ohmic heating phase of Doublet III, with emphasis on the production of good target plasmas for the upcoming neutral beam injection phase. The program plan for the device over the life of the US-Japan cooperative program is discussed, as is the status of the preliminary investigation into replacing the present vacuum vessel by one better suited for ETF simulation

  11. Jeroky Mbaekua - aspectos da etnoarte indígena.

    Directory of Open Access Journals (Sweden)

    Oseias de Oliveira

    2015-06-01

    Full Text Available A idéia de arte compartilhada na cultura ocidental tradicionalmente tem sido entendida a partir de elementos conceituais e categorizações que não podem ser aplicados na cultura indígena. Assim, considerar a arte indígena significa observar sua complexidade, de forma a perpassar todas as instâncias da vida desses sujeitos. Desta forma, o texto busca discutir aspectos da etnoarte indígena que não é focada em uma noção de arte centralizada e homogeneizadora mas, sim atenta à uma perspectiva que busca contemplar melhor o seu modo de construção de símbolos, significados e representações culturais.

  12. Tabaco y salud infantil: un aspecto no suficientemente valorado

    OpenAIRE

    Rubio, Ivonne; Kanopa, Virginia

    2015-01-01

    La campaña que se desarrolla en Uruguay contra el consumo de tabaco enfatiza sobre los efectos nocivos que produce el cigarrillo en la salud de la población adulta que fuma y en fumadores pasivos. La disminución de afecciones cardiovasculares como el infarto de miocardio y del cáncer de pulmón ha mostrado resultados alentadores en relación a la disminución del número de consumidores, si bien aún no se ha logrado el descenso esperado. La campaña enfoca varios aspectos dirigidos a la presentaci...

  13. Electrosorption of As(III) in aqueous solutions with activated carbon as the electrode

    Science.gov (United States)

    Dai, Min; Xia, Ling; Song, Shaoxian; Peng, Changsheng; Rangel-Mendez, Jose Rene; Cruz-Gaona, Roel

    2018-03-01

    The electrosorption of As(III) in aqueous solutions by using activated carbon (AC) as the electrode was studied in this work. This study was performed through the measurements of adsorption and desorption, Cyclic Voltammetry (CV), Electrochemical Impedance Spectroscopy (EIS) and X-ray photoelectron spectra (XPS). Three parameters, applied voltage, solution pH and initial As(III) concentration, on the electrosoprtion of As(III) were investigated. The experimental results have demonstrated that the electrosorption followed three steps: migration of As(III) to the anode, oxidation of As(III) to As(V) and accumulation of As(V) in the electric double layers of the anode. The electrodorption capacity increased with increasing applied voltage and initial As(III) concentration, whereas the effect of pH was complicated for the variation of arsenite species and the competition of OH-. The oxidation of As(III) increased with the increasing voltage and pH due to the increasing redox potential acted on As(III). The electrosorption served to reduce the toxicity of arsenic and was a promising technology for As(III) removal from water.

  14. Calidad de servicio (QoS en procesos: Escenarios de procesamiento con aspectos

    Directory of Open Access Journals (Sweden)

    Hector Manuel Soto Pérez

    2016-12-01

    En resumen el presente trabajo estudia conceptos básicos de calidad de servicio y algunos de sus marcos de aplicación siguiendo un enfoque aspectual. Planteando posibles casos de uso genéricos para aplicar mejoras en la prestación de la QoS mediante aspectos en la planificación y gestión de recursos de aplicaciones tradicionales.

  15. Sobressalto patológico: aspectos clínicos e eletrencefalográficos

    Directory of Open Access Journals (Sweden)

    Frederico Dahne Kliemann

    1967-06-01

    Full Text Available Os autores relatam o caso de um paciente apresentando crises de sobressalto provocadas por estímulos auditivos, sensitivos e visuais, sem crises epilépticas espontâneas nem retardo psicomotor. Estudam os aspectos clínicos e eletrencefalográficos e revisam a situação da entidade entre as assim chamadas epilepsias reflexas.

  16. ANÁLISIS DE LA TRAZABILIDAD DESDE LA PERSPECTIVA DE LA ORIENTACIÓN A ASPECTOS

    Directory of Open Access Journals (Sweden)

    Marta Silvia Tabares

    Full Text Available En este artículo se presenta un análisis acerca de la trazabilidad de los intereses de un sistema de software, desde el enfoque del desarrollo de software orientado a aspectos. Para esto se abordarán los conceptos generales de trazabilidad, de la orientación a aspectos y de las características que esta técnica puede proveer para verificar la fiabilidad y evolución de los requisitos en el proceso de desarrollo de software. Tratar la trazabilidad desde este enfoque pretende orientar al desarrollador a identificar elementos generales para determinar la traza de los intereses de corte transversal cuando estos afectan otros intereses del sistema y a su vez cómo diferentes piezas de un artefacto de software asociadas a este tipo de intereses han evolucionado y afectado a otras a lo largo del ciclo de vida de desarrollo.

  17. Rorschach and the WAIS-III after one and two years of psychotherapy O teste de Rorschach e a Escala WAIS-III após um e dois Anos de psicoterapia

    Directory of Open Access Journals (Sweden)

    Latife Yazigi

    2011-01-01

    Full Text Available This study aimed at identifying what aspects of personality are modified after one and two years of psychoanalytic psychotherapy in adults attending a free university healthcare service in São Paulo, Brazil. The instruments were the Rorschach and the WAIS-III tests which were administered before and after one and two years of treatment. The participants were 34 adult individuals, both genders. After one year of psychotherapy in the Rorschach method there was an increase in effective and adaptive interpersonal relationship, an enhancement in sensitiveness related to the capacity of modulating affect, the need for close contact as well as the arousal of feelings of discomfort associated with intensification of self-regard, and a decrease in narcissistic tendencies. As well as in WAIS-III, there was an increase in motivation, attention and speed processing.O estudo teve por objetivo identificar quais aspectos da personalidade são modificados após um e dois anos de psicoterapia psicanalítica em adultos atendidos em um serviço público de saúde mental de uma universidade em São Paulo, no Brasil. Os instrumentos utilizados foram o Rorschach e a Escala de Inteligência Wechsler para adultos (WAIS-III, os quais foram administrados antes e após um e dois anos de tratamento. Os participantes foram 34 indivíduos adultos, de ambos os sexos. No Rorschach, após um ano de psicoterapia, ocorreu melhora da relação interpessoal adaptada e efetiva, melhora na sensibilidade relacionada à capacidade de modular afeto e da necessidade de contato mais próximo, e surgimento de sentimentos de desconforto associados à intensificação de auto-observação e diminuição de tendências narcisistas. No WAIS-III houve aumento de motivação, melhora atencional e de velocidade de processamento.

  18. Experimental analysis of the power curve sensitivity test series at ROSA-III

    International Nuclear Information System (INIS)

    Koizumi, Y.; Iriko, M.; Yonomoto, T.; Tasaka, K.

    1985-01-01

    The rig of safety assessment (ROSA)-III facility is a volumetrically scaled (1/424) boiling water reactor (BWR/6) system with an electrically heated core designed for integral LOCA and ECCS tests. Seven recirculation pump suction line break LOCA experiments were conducted at the ROSA-III facility in order to examine the effect of the initial stored heat of a fuel rod on the peak cladding temperature (PCT). The break size was changed from 200% to 5% in the test series and a failure of a high pressure core spray (HPCS) diesel generator was assumed. Three power curves which represented conservative, realistic and zero initial stored heat, respectively, were used. In a large break LOCA such as 200% or 50% breaks, the initial stored heat in a fuel rod has a large effect on the cladding surface temperature because core uncovery occurs before all the initial stored heat is released, whereas in a small break LOCA such as a 5% break little effect is observed because core uncovery occurs after the initial stored heat is released. The maximum PCTs for the conservative initial stored heat case was 925 K, obtained in the 50% break experiment, and that for the realistic initial stored heat case was 835 K, obtained in the 5% break experiment. (orig./HP)

  19. Experimental determination of the energy levels of the antimony atom (Sb II), ions of the antimony (Sb II, Sb III), mercury (Hg IV) and cesium (Cs X)

    International Nuclear Information System (INIS)

    Arcimowicz, B.

    1993-01-01

    The thesis concerns establishing the energy scheme of the electronic levels, obtained from the analysis of the investigated spectra of antimony atom and ions (Sb I, Sb II, Sb III) and higher ionized mercury (Hg IV) and cesium (Cs X) atoms. The experimental studies were performed with optical spectroscopy methods. The spectra of the elements under study obtained in the spectral range from visible (680 nm) to vacuum UV (40 nm) were analysed. The classification and spectroscopic designation of the experimentally established 169 energy levels were obtained on the basis of the performed calculations and the fine structure analysis. The following configurations were considered: 5s 2 5p 2 ns, 5s 2 5p 2 n'd, 5s5p 4 of the antimony atom, 5s 2 5pns, 5s 2 5pn'd, 5s5p 3 of the ion Sb II, 5s 2 ns, 5s 2 n'd, 5s5p 2 of the on Sb III, 5d 8 6p of the ion Hg IV 4d 9 5s and 4d 9 5p Cs X. A reclassification was performed and some changes were introduced to the existing energy level scheme of the antimony atom, with the use of the information obtained from the absorption spectrum taken in the VUV region by the ''flash pyrolysis'' technique. The measurements of the hyperfine splittings in 19 spectral lines belonging to the antimony atom and ions additionally confirmed the assumed classification of the levels involved in these lines. The energy level scheme, obtained for Sb III, was compared to the other ones in the isoelectronic sequence starting with In I. On the basis of the analysis of the Hg IV spectrum it was proved that ground configuration of the three times ionized mercury atom is 5d 9 not 5d 8 6s as assumed until now. The fine structure, established from the analysis of the spectra of the elements under study was examined in multiconfiguration approximation. As a result of the performed calculations the fine structure parameters and wavefunctions were determined for the levels whose energy values were experimentally established in the thesis. (author). 140 refs, 22 figs, 17

  20. Prótesis dental en el paciente anciano: aspectos relevantes

    OpenAIRE

    Almeida, Erika Oliveira de; Silva, Eulália Maria Martins da; Falcón Antenucci, Rosse Mary; Freitas Junior, Amílcar Chagas

    2014-01-01

    Para el paciente anciano la prótesis dental es una integradora familiar, social, mantenedora de la salud general y elevadora de la expectativa de vida. Algunos cambios fisiológicos, patológicos y funcionales que ocurren con los elementos dentales en la tercera edad pueden repercutir en el tratamiento protésico. La siguiente revisión de literatura destaca los aspectos  fundamentales que deben ser considerados en el tratamiento protésico de pacientes ancianos. Se destacan las particularidades d...

  1. Intrinsic Instability of Cs2In(I)M(III)X6 (M = Bi, Sb; X = Halogen) Double Perovskites: A Combined Density Functional Theory and Experimental Study.

    Science.gov (United States)

    Xiao, Zewen; Du, Ke-Zhao; Meng, Weiwei; Wang, Jianbo; Mitzi, David B; Yan, Yanfa

    2017-05-03

    Recently, there has been substantial interest in developing double-B-cation halide perovskites, which hold the potential to overcome the toxicity and instability issues inherent within emerging lead halide-based solar absorber materials. Among all double perovskites investigated, In(I)-based Cs 2 InBiCl 6 and Cs 2 InSbCl 6 have been proposed as promising thin-film photovoltaic absorber candidates, with computational examination predicting suitable materials properties, including direct bandgap and small effective masses for both electrons and holes. In this study, we report the intrinsic instability of Cs 2 In(I)M(III)X 6 (M = Bi, Sb; X = halogen) double perovskites by a combination of density functional theory and experimental study. Our results suggest that the In(I)-based double perovskites are unstable against oxidation into In(III)-based compounds. Further, the results show the need to consider reduction-oxidation (redox) chemistry when predicting stability of new prospective electronic materials, especially when less common oxidation states are involved.

  2. THE WIDESPREAD OF Fe(III)-REDUCING BACTERIA IN NATURAL ECOSYSTEMS OF ECUADOR.

    Science.gov (United States)

    Tashyrev, O B; Govorukha, V M

    2015-01-01

    The widespread of Fe(III)-reducing microorganisms in natural ecosystems of Ecuador of La Favorita, Tungurahua volcano and Papallacta areas was experimentally proved. High efficiency of microbial precipitation of soluble iron compounds was also demonstrated. Obtained results indicate the potential ability of Fe(III)-reducing microorganisms to influence the formation of carbon and iron vector fluxes in ecosystems, as well as development of effective biotechnologies of water purification from iron compounds.

  3. Aspectos metodologicos de la medición en el sitio de ocurrencia de lesiones por accidentes de tráfico

    Directory of Open Access Journals (Sweden)

    Híjar-Medina Martha C.

    1997-01-01

    Full Text Available Os acidentes de trânsito de veículos a motor representam problema de saúde pública, em nível mundial. No México, a pesquisa, nesse campo, é limitada e a metodologia para seu estudo é pouco desenvolvida. Na literatura científica internacional são escassos os artigos que discutem os aspectos metodológicos de pesquisa nesse campo. Assim, realizou-se estudo com o objetivo de apresentar alguns aspectos metodológicos úteis para os interessados em pesquisar lesões por acidentes de trânsito. Foram discutidos aspectos sobre como medir, no local de ocorrência, as variáveis básicas para o estudo dessas lesões, tais como: se o motorista sofreu ou não lesões, uso de cinto de segurança, velocidade e consumo de álcool.

  4. Thermodecomposition of lanthanides (III) and ytrium (III) glucoheptonates

    International Nuclear Information System (INIS)

    Giolito, J.

    1987-01-01

    The lanthanides (III) and yttrium (III) glucoheptonates as well the D-glucoheptono 1-4 lactone were studied using common analytical methods, elemental microanalysis of carbon and hydrogen, thermogravimetry and differential scanning calorimetry. These compounds were prepared from the reaction between the lanthanides (III) and yttrium (III) hydroxides and glucoheptonic acid aqueous solution obtained by means of the delta lactone hydrolysis of this acid. After stoichiometric reaction the compounds were precipitated by the addition of absolute ethanol, washed with the same solvent and dried in desiccator. Thermogravimetric the (TG) curves of the lanthanides glucoheptonates of the ceric group present thermal profiles with enough differences permitting an easy caracterization of each compound and the yttrium (III) glucoheptonate TG curve showed a great similarity with the erbium (III) compound TG curve. The differential scanning calometry (DSC) curves showed endothermic and exothermic peaks by their shape, height and position (temperature) permit an easy and rapid identification of each compound specially if DSC and TG curves were examined simultaneously. (author) [pt

  5. The Moessbauer effect in Fe(III) HEDTA, Fe(III) EDTA, and Fe(III) CDTA compounds

    International Nuclear Information System (INIS)

    Prado, F.R.

    1989-01-01

    The dependence of Moessbauer spectra with pH value of Fe(III)HEDTA and Fe(III)CDTA compounds is studied. Informations on formation processes of LFe-O-FeL (L=ligand) type dimers by the relation of titration curves of Fe(III)EDTA, Fe(III)HEDTA and Fe(III)CDTA compounds with the series of Moessbauer spectra, are obtained. Some informations on Fe-O-Fe bond structure are also obtained. Comparing the titration curves with the series of Moessbauer spectra, it is concluded that the dimerization process begins when a specie of the form FeXOH α (X = EDTA, HEDTA, CDTA; α = -1, -2) arises. (M.C.K.) [pt

  6. [Cephalometric analysis in cases with Class III malocclusions].

    Science.gov (United States)

    Rak, D

    1989-01-01

    Various orthodontic class III anomalies, classified into several experimental groups, and eugnathic occlusions serving as controls were studied by roentgencephalometry. The objective of the study was to detect possible distinctions in the quantitative values of two variables chosen and to select the variables which most significantly discriminate the group of class III orthodontic anomalies. Attempts were made to ascertain whether or not there were sex-related differences. The teleroentgenograms of 269 examines, aged 10-18 years, of both sexes were analyzed. The experimental group consisted of 89 examinees class III orthodontic anomalies. The control group consisted of 180 examines with eugnathic occlusion. Latero-lateral skull roentgenograms were taken observing the rules of roentgenocephalometry. Using acetate paper, the drawings of profile teleroentgenograms were elaborated and the reference points and lines were entered. A total of 38 variables were analyzed, of which there were 10 linear, 19 angular, and 8 variables were obtained by mathematical calculation; the age variable was also analyzed. In statistical analyses an electronic computer was used. The results are presented in tables and graphs. The results obtained showed that: --compared to the findings in the control group, the subjects in the experimental group displayed significant changes in the following craniofacial characteristics a negative difference in the position of the apical base of the jaw, manifest concavity of the osseous profile and diminished convexity of the profile of soft parts, retroinclination of the lower incisors, mandibular prognathism, increased mandibular angle and increased mandibular proportion compared to maxillary and the anterior cranial base; --with regard to the sex of the examinees, only four linear variables of significantly discriminating character were selected, so that in can be concluded that there were no significant sex differences among the morphological

  7. Aspectos de diseño de un entorno de programación colaborativo

    Directory of Open Access Journals (Sweden)

    David Bracho

    2008-12-01

    Full Text Available ResumenLa programación colaborativa, o programación en par, es una de las áreas más estudiadas actualmente debido a su impacto en el proceso de desarrollo de software. El propósito de la presente investigación consistió en determinar los aspectos básicos de diseño que un entorno de programación colaborativo debe ofrecer a los desarrolladores. La metodología utilizada consistió en realizar un análisis documental sobre la propuesta de Lussier acerca de la programacióncolaborativa con la finalidad de determinar los aspectos de diseño, estructura e implementación de este tipo de entornos. Como resultado se obtuvo que desde el punto de vista del diseño, la comunicación entre desarrolladores, la revisión de código y la construcción del proyecto de software son los principales aspectos a considerar, y desde el punto de vista de la implementación se propone utilizar el modelo cliente - servidor y una arquitectura multiplataforma.AbstractCollaborative programming or pair programming is today one of the most studied areas, because of its impact on the software developing process. The purpose of the present investigation was to determine the basic design aspects that a collaborative programming environment must offer to developers. The methodology used was a documental review of Lussier’s work about collaborative programming, to determine the design aspects, the structure and the implementation aspects of this type of environments. As result, from the design point of view, the communication between developers, code review and the construction of software project are the basic aspects to consider, and from the implementation point of view, the use of the client - server model and a multiplatform architecture are proposed.

  8. Tumores em animais de produção: aspectos comparativos

    OpenAIRE

    Ramos,Adriano Tony; Souza,Arlete Benta de; Norte,Diego Mollerke; Ferreira,João Luiz Montiel; Fernandes,Cristina Gevehr

    2008-01-01

    Com o objetivo de realizar um estudo retrospectivo de tumores em animais de produção (bovinos, ovinos, eqüinos e suínos), foi realizada uma revisão nos casos suspeitos de neoplasmas recebidos pelo Laboratório Regional de Diagnóstico da Faculdade de Veterinária da Universidade Federal de Pelotas num período de 24 anos (1978-2002). Os aspectos epidemiológicos dos neoplasmas nessas espécies foram relatados, e uma classificação concisa para padronizar a nomenclatura, seguindo padrões internaciona...

  9. Spectroscopic and thermodynamic study of the complexation of Cm(III) and Eu(III) with hydrophilic bis-triazinyl pyridines

    International Nuclear Information System (INIS)

    Ruff, Christian

    2013-01-01

    In the present work the complexation of Cm(III) and Eu(III) with a hydrophilic 2,6-bis-(1,2,4-triazinyl)-pyridine (aq-BTP) is studied. Aq-BTP complexes actinides(III) selectively over lanthanides(III) in nitric acid solution. The object of this work is the identification and the spectroscopic and thermodynamic characterization of the Cm(III) and Eu(III) complex species present in solution. The results should contribute to a better fundamental understanding of the driving force behind BTPs selectivity towards trivalent actinides on a molecular level. Time-resolved laser fluorescence spectroscopy (TRLFS), luminescence and UV/Vis spectroscopy are applied. Information on the structure of M(III)-aq-BTP complex species is obtained from density functional theory. Three different M(III) complex species containing one, two or three aq-BTP ligands are identified in H 2 O at pH 3.0. Relative fluorescence intensity factors are determined for each of the [M(aq-BTP) n ] complexes (M = Cm(III)/Eu(III), n = 1 - 3). These factors are required to quantify the complexes. The stability constant logβ 3 of the [Cm(aq-BTP) 3 ] complex (which is the one relevant to extraction processes) is two orders of magnitude higher than that of the corresponding Eu(III) complex. This difference is in agreement with the separation factor (SF Am(III)/Eu(III) = 150) determined experimentally by liquid-liquid extraction. The difference in the stability constants originates from the different reaction enthalpies for the formation of the [M(aq-BTP) 3 ] complexes. These results represent the thermodynamic driving force for the aq-BTPs selectivity towards trivalent actinides over lanthanides. Comparing the stability constants of the [M(aq-BTP) n ] species (M = Cm(III)/Eu(III), n = 1 - 3) shows an increasing selectivity with increasing number of coordinated aq-BTP ligands. Hence, high selectivity is achieved if the f-element ions are fully coordinated by nine N-donor atoms (three aq-BTP ligands). A less

  10. Transferrable monolithic III-nitride photonic circuit for multifunctional optoelectronics

    Science.gov (United States)

    Shi, Zheng; Gao, Xumin; Yuan, Jialei; Zhang, Shuai; Jiang, Yan; Zhang, Fenghua; Jiang, Yuan; Zhu, Hongbo; Wang, Yongjin

    2017-12-01

    A monolithic III-nitride photonic circuit with integrated functionalities was implemented by integrating multiple components with different functions into a single chip. In particular, the III-nitride-on-silicon platform is used as it integrates a transmitter, a waveguide, and a receiver into a suspended III-nitride membrane via a wafer-level procedure. Here, a 0.8-mm-diameter suspended device architecture is directly transferred from silicon to a foreign substrate by mechanically breaking the support beams. The transferred InGaN/GaN multiple-quantum-well diode (MQW-diode) exhibits a turn-on voltage of 2.8 V with a dominant electroluminescence peak at 453 nm. The transmitter and receiver share an identical InGaN/GaN MQW structure, and the integrated photonic circuit inherently works for on-chip power monitoring and in-plane visible light communication. The wire-bonded monolithic photonic circuit on glass experimentally demonstrates in-plane data transmission at 120 Mb/s, paving the way for diverse applications in intelligent displays, in-plane light communication, flexible optical sensors, and wearable III-nitride optoelectronics.

  11. Neodymium Recovery by Chitosan/Iron(III Hydroxide [ChiFer(III] Sorbent Material: Batch and Column Systems

    Directory of Open Access Journals (Sweden)

    Hary Demey

    2018-02-01

    Full Text Available A low cost composite material was synthesized for neodymium recovery from dilute aqueous solutions. The in-situ production of the composite containing chitosan and iron(III hydroxide (ChiFer(III was improved and the results were compared with raw chitosan particles. The sorbent was characterized using Fourier transform infrared spectroscopy (FTIR and scanning electron microscopy-energy dispersive X-ray analyses (SEM-EDX. The equilibrium studies were performed using firstly a batch system, and secondly a continuous system. The sorption isotherms were fitted with the Langmuir, Freundlich, and Sips models; experimental data was better described with the Langmuir equation and the maximum sorption capacity was 13.8 mg g-1 at pH 4. The introduction of iron into the biopolymer matrix increases by four times the sorption uptake of the chitosan; the individual sorption capacity of iron (into the composite was calculated as 30.9 mg Nd/g Fe. The experimental results of the columns were fitted adequately using the Thomas model. As an approach to Nd-Fe-B permanent magnets effluents, a synthetic dilute effluent was simulated at pH 4, in order to evaluate the selectivity of the sorbent material; the overshooting of boron in the column system confirmed the higher selectivity toward neodymium ions. The elution step was carried out using MilliQ-water with the pH set to 3.5 (dilute HCl solution.

  12. Sorption of trace amounts of gallium (III) on iron (III) oxide

    International Nuclear Information System (INIS)

    Music, S.; Gessner, M.; Wolf, R.H.H.

    1979-01-01

    The sorption of trace amounts of gallium(III) on iron(III) oxide has been studied as a function of pH. Optimum conditions have been found for the preconcentration of traces of gallium(III) by iron(III) oxide. The influence of surface active substances and of complexing agents on the sorption of trace amounts of gallium(III) on iron(III) oxide has been also studied. (orig.) [de

  13. Sorption of trace amounts of gallium (III) on iron (III) oxide

    Energy Technology Data Exchange (ETDEWEB)

    Music, S; Gessner, M; Wolf, R H.H. [Institut Rudjer Boskovic, Zagreb (Yugoslavia)

    1979-01-01

    The sorption of trace amounts of gallium(III) on iron(III) oxide has been studied as a function of pH. Optimum conditions have been found for the preconcentration of traces of gallium(III) by iron(III) oxide. The influence of surface active substances and of complexing agents on the sorption of trace amounts of gallium(III) on iron(III) oxide has been also studied.

  14. Gas-phase infrared spectrum of phosphorus (III) oxycyanide, OPCN: Experimental and theoretical and theoretical investigations

    International Nuclear Information System (INIS)

    Allaf, A.W.; Kassem, M.; Alibrahim, M.

    1999-01-01

    An attempt was made to observe the gas-phase infrared spectrum of phosphorus (III) oxycyanide, OPCN for the first time. This molecule was produced by on-line process using phosphorus (III) oxychloride, OPCI as precursor passed over heated Ag CN. The products were characterised by the infrared spectra of their vapours. The low resolution gas-phase Fourier transform infrared spectrum shows two bands at 2165 and 1385 cm -1 . These bands are assigned to ν 1 (C≡N stretch) and ν 2 (O=P stretch), respectively. Ab initio self-consistent-field (SCF) molecular orbital (MO) and Moeller - Plesset second order perturbation theory (MP2) calculations were performed to determine the geometry, total energy and vibrational frequencies of OPCN. (authors)

  15. Aspectos relativos a la salud laboral y los riesgos psicosociales de los equipos de proyectos

    OpenAIRE

    Donate Fernández, Alejandro

    2013-01-01

    Es el objetivo del presente trabajo presentar una serie de directrices relacionadas con la salud laboral y los riesgos psicosociales de los equipos de proyectos y, en algunos aspectos centrándose en el principal responsable: el director de proyecto.

  16. WISC-III e WAIS-III na avaliação da inteligência de cegos WISC-III/WAIS-III en ciegos WISC-III and WAIS-III in intellectual assessment of blind people

    Directory of Open Access Journals (Sweden)

    Elizabeth do Nascimento

    2007-12-01

    Full Text Available Diante da escassez de pesquisas nacionais e de testes psicológicos destinados a avaliar pessoas cegas, desenvolveu-se um estudo psicométrico com as escalas verbais dos testes WISC-III e WAIS-III. Após as adaptações de alguns estímulos e das instruções, os testes foram aplicados em crianças (N = 120 e adultos (N = 52 residentes em Belo Horizonte. Os resultados indicaram que as escalas verbais modificadas apresentam uma boa consistência interna (alfa> 0,80. Além disso, a investigação da validade fatorial identifica a presença clara de apenas um componente. Este componente explica 81% e 64% para o WISC-III e WAIS-III, respectivamente. Conclui-se que as adaptações a que se procedeu não afetaram a estrutura fatorial das escalas. Deste modo, os profissionais poderão utilizar as escalas modificadas para avaliar a inteligência de pessoas cegas.Frente a la escasez de investigaciones nacionales asi como la ausencia de tests psicológicos que evaluen personas ciegas, se ha desarrollado un estudio psicometrico com la escalas verbales del WISC-III y WAIS-III. Posteriormente a las adaptaciones de algunos estímulos y de las instrucciones, las escalas fueron aplicadas a una muestra de niños (n=120 y de adultos (n=52 residentes en la ciudad de Belo Horizonte-Brasil. Los resultados indican que las escalas verbales modificadas presentan una alta fiabilidad (alpha >0,80 asi como la presencia clara de un unico componente responsable por 81% y 64% de la variancia del WIC-III e WAIS-III respectivamente. Se ha concluido que las modificaciones efectuadas no han comprometido la estructura factorial de las escalas verbales. Por tanto, los profesionales psicólogos pueden utilizar las escalas modificadas para la evaluación de la inteligencia de personas portadoras de ceguera.Owing to the almost lack of a national research on psychological testing for the evaluation of blind people, a psychometric study has been developed with the WISC-III and WAIS-III

  17. Dor neuropática central após lesão medular traumática: capacidade funcional e aspectos sociais

    OpenAIRE

    Vall, Janaina; Braga, Violante Augusta Batista

    2005-01-01

    Estudo de caso comparativo com o objetivo de avaliar a capacidade funcional e os aspectos sociais de dois pacientes, ambos com lesão medular traumática, sem e com dor neuropática central associada, respectivamente. Para avaliar a capacidade funcional, foi utilizado como instrumento o Functional Independence Measure ou Escala de Independência Funcional. E para avaliar os aspectos sociais foi construído o ecomapa de cada paciente, preconizado pelo modelo Calgary de avaliação de famílias. Ambos ...

  18. New Tunneling Features in Polar III-Nitride Resonant Tunneling Diodes

    Directory of Open Access Journals (Sweden)

    Jimy Encomendero

    2017-10-01

    Full Text Available For the past two decades, repeatable resonant tunneling transport of electrons in III-nitride double barrier heterostructures has remained elusive at room temperature. In this work we theoretically and experimentally study III-nitride double-barrier resonant tunneling diodes (RTDs, the quantum transport characteristics of which exhibit new features that are unexplainable using existing semiconductor theory. The repeatable and robust resonant transport in our devices enables us to track the origin of these features to the broken inversion symmetry in the uniaxial crystal structure, which generates built-in spontaneous and piezoelectric polarization fields. Resonant tunneling transport enabled by the ground state as well as by the first excited state is demonstrated for the first time over a wide temperature window in planar III-nitride RTDs. An analytical transport model for polar resonant tunneling heterostructures is introduced for the first time, showing a good quantitative agreement with experimental data. From this model we realize that tunneling transport is an extremely sensitive measure of the built-in polarization fields. Since such electric fields play a crucial role in the design of electronic and photonic devices, but are difficult to measure, our work provides a completely new method to accurately determine their magnitude for the entire class of polar heterostructures.

  19. Aspectos cuantitativos de los programas universitarios de administración de empresas en Colombia

    Directory of Open Access Journals (Sweden)

    Carlos Henao Restrepo

    1991-05-01

    Full Text Available RESUMEN La estabilización o el crecimiento en la oferta universitaria de este programa, en términos  cuantitativos como cualitativos, es uno de los aspectos críticos para las instituciones que postulan mejoras de calidad dentro de las nuevas reglas del mercado educativo.

  20. Extraction and separation studies of Ga(III, In(III and Tl(III using the neutral organophosphorous extractant, Cyanex-923

    Directory of Open Access Journals (Sweden)

    P. M. DHADKE

    2003-07-01

    Full Text Available The neutral extractant, Cyanes-923 has been used for the extraction and separation of gallium(III, indium(III and thallium(III from acidic solution. These metal ions were found to be quantitatively extracted with Cyanex-923 in toluene in the pH range 4.5–5.5, 5.0–6.5 and 1.5–3.0, respectively, and from the organic phase they can be stripped with 2.0 mol dm-3 HNO3, 3.0 mol dm-3 HNO3 and 3.0 mol dm-3 HCl, respectively. The effect of pH equilibration period, diluents, diverse ions and stripping agents on the extraction of Ga(III, In(III and Tl(III has been studied. The stroichiometry of the extracted species of these metal ions was determined on the basis of the slope analysis method. The reaction proceed by solvation and the probable extracted species found were [MCl3. 3Cyanex-923] [where M = Ga(III or In(III ] and [HTlCl4. 3Cyanex-923]. Based on these results a sequential procedure for the separation of Ga(III, In(III and Tl(III from each other was developed.

  1. Study of Stoichiometry and Stability of some Fe(III)-Amino Acid Complexes

    International Nuclear Information System (INIS)

    Latif, S.; Shirin, K.; Nisar, S.; Zahida, T. M.

    2005-01-01

    The complexation of ferric with three amino acids (Glycine, Glutamic acid and Aspartic acid) was studied spectrophotometrically and potentiometrically at pH 5.0 and in aqueous medium. The stoichiometry was calculated spectrophotometrically using mole ratio method and is found to be ML3 for Fe (III)-Glycine and ML2 for Fe (III)-Glutamate for Fe (III)-Glutamate and Aspartate complex. The stabilities of these complexes were calculated spectrophotometrically and potentiometrically. The experimental results of potentiometric titrations were treated by well known computer program B EST . The values were further refined till least sigma fit i.e. 0.03. The complexes were not formed under normal conditions. Each complex was studied at more than one wavelength and no kmax was obtained because Fe (III) solution and the complexes absorb in similar wavelength region. The formation constants of all these complexes are not very high shows weak complexation of Fe (III) with these amino acids. (author)

  2. Removal of lead from aqueous solutions by using the natural and Fe(III)-modified zeolite

    International Nuclear Information System (INIS)

    Kragović, Milan; Daković, Aleksandra; Sekulić, Živko; Trgo, Marina; Ugrina, Marin; Perić, Jelena; Gatta, G. Diego

    2012-01-01

    In the present study, the sorption of lead by the natural and Fe(III)-modified zeolite (clinoptilolite) is described. The characterization of the natural zeolite-rich rock and the Fe(III)-modified form was performed by chemical analysis, point of the zero charge (pH pzc ), X-ray powder diffraction, applying the Rietveld/RIR method for the quantitative phase analysis, and scanning electron microscopy. The effects of sorbents dose and the initial lead concentrations on its sorption by two sorbents were investigated. For both sorbents, it was determined that at lower initial concentrations of lead, ion exchange of inorganic cations in zeolites with lead, together with uptake of hydrogen dominated, while at higher initial lead concentrations beside these processes, chemisorption of lead occurred. Significantly higher sorption of lead was achieved with Fe(III)-modified zeolite. From sorption isotherms, maximum sorbed amounts of lead, under the applied experimental conditions, were 66 mg/g for the natural and 133 mg/g for Fe(III)-modified zeolite. The best fit of experimental data was achieved with the Freundlich model (R 2 ≥ 0.94).

  3. Application of the subchannel analysis code COBRA III C for liquid sodium

    International Nuclear Information System (INIS)

    Nissen, K.L.

    1981-01-01

    The subchannel-analysis code COBRA III C was developed to gain knowledge of mass flow and temperature distribution in rod bundles of light water reactors. A comparison of experimental results for the temperature distribution in a 19 rod bundle with calculations done by the computer program shows the capability of COBRA III C to handle liquid sodium cooling. The code needs sodium properties as well as changed correlations for turbulent mixing and heat transfer at the rod. (orig.) [de

  4. Potentiometric studies on some ternary complexes of Nd(III), Sm(III), Gd(III) and Ho(III) with cyclohexanediaminetetraacetic acid as primary ligand

    International Nuclear Information System (INIS)

    Marathe, D.G.; Munshi, K.N.

    1983-01-01

    The formation constants of the ternary complexes of neodymium(III), samarium(III), gadlonium(III) and holmium(III) with cyclohexanediaminetetraacetic acid (CyDTA) as primary ligand and dihydroxynaphthalene (DHN), dihydroxynaphthalene-6-sulphonic acid (DHNSA) and cateechol-3,5-disulphonic acid (CDSA) as secondary ligands have been investigated by potentiometric titration technique. The secondary ligands have been investigated by potentiometric titration technique. The values of formation constants of 1:1:1 ternary chelates are reported at three different temperatures, and at a fixed ionic strength, μ = 0.1 M (NaClO 4 ). (author)

  5. Solvent effects on extraction of aluminum(III), gallium(III), and indium(III), with decanoic acid

    International Nuclear Information System (INIS)

    Yamada, Hiromichi; Hayashi, Hisao; Fujii, Yukio; Mizuta, Masateru

    1986-01-01

    Extraction of aluminum(III) and indium(III) with decanoic acid in 1-octanol was carried out at 25 deg C and at an aqueous ionic strength of 0.1 mol dm -3 (NaClO 4 ). Monomeric and tetrameric aluminum(III) decanoates and monomeric indium(III) decanoate are responsible for the extraction. From a comparison of the present results with those obtained from the previous works, the polymerization of the extracted species was found to be more extensive in benzene than in 1-octanol, and the metal decanoates were highly polymerized in the following order in both solvents: Al > Ga > In. (author)

  6. Responsabilidad de directores de sociedades en Estados Unidos. Aspectos procesales

    Directory of Open Access Journals (Sweden)

    Héctor José Miguens

    2015-01-01

    El objeto de este artículo es describir este régimen en su totalidad y realizar un juicio crítico de las normas que rigen las acciones procesales de la responsabilidad de los directores de sociedades comerciales en el derecho societario en Estados Unidos. La metodología utilizada en este trabajo responde a la sistemática de los autores norteamericanos citados, que se caracteriza por centrarse en los aspectos prácticos, la solución de problemas particulares y el comentario crítico de la jurisprudencia aplicable a la cuestión.

  7. Aspectos das relações interpessoais em Freud: questionamentos morais

    OpenAIRE

    Virginia Helena Ferreira da Costa

    2014-01-01

    O objetivo principal da dissertação é problematizar, a partir de textos de Freud, o prolongamento de expectativas e fantasias próprias da infância em aspectos sociais e políticos da vida adulta. Para tanto, as relações interpessoais são consideradas mediante dois pontos de vista da teoria freudiana, a saber, o do desenvolvimento individual e das relações e estruturas sociais. Como pano de fundo para tal problemática, são abordadas a experiência edípica infantil e a situação de desamparo como ...

  8. Aspectos psicológicos del paciente con cáncer

    Directory of Open Access Journals (Sweden)

    R. Labarca B.

    2017-05-01

    Full Text Available El profundo cambio que ha experimentado lamedicina en los últimos años, ha traído como consecuencia un deterioro en la relación médico-paciente. La consecuencia de este hecho es un distanciamiento entre médico y enfermo, situación que afecta seriamente a los pacientes con enfermedades incurables o terminales. El presente artículo revisa los aspectos psicológicos principales del enfermo con cáncer y concluye que la única actitud que cabe ante el enfermo canceroso es la verdadera relación médico-paciente.

  9. ASPECTOS REPRODUCTIVOS EN MUJERES PORTADORAS DE MUTACIONES GENÉTICAS BRCA

    OpenAIRE

    Dr. Octavio Peralta; Dr. Tulio Rodríguez; Dra. Adela Camus

    2017-01-01

    Se analizan diferentes aspectos reproductivos en mujeres portadoras de mutaciones genéticas BRCA. Se revisa la evidencia científica del riesgo que agrega el uso de anticoncepción hormonal a mujeres con diferentes niveles de riesgo concluyendo que con las formulaciones recientes después del 2010 no hay aumento del riesgo de cáncer de mama. En portadoras de mutaciones BRCA, el uso prolongado antes de los 25 años se asocia a un leve mayor riesgo de diagnóstico temprano de cáncer de mama. Se a...

  10. EMPREENDEDORISMO CORPORATIVO - ASPECTOS DE INOVAÇÃO E MUDANÇA ORGANIZACIONAL

    Directory of Open Access Journals (Sweden)

    Luciana Gehlen

    2016-11-01

    Full Text Available Este artigo analisa o conceito de empreendedorismo corporativo – conhecido também como empreendedorismo interno ou intra-empreendedorismo, seus aspectos relacionados aos fatores de criatividade, inovação e mudança organizacional como fatores de competitividade das organizações, bem como o perfil do empreendedor corporativo e o ambiente organizacional necessário para que o empreendedorismo interno aconteça. Palavras-chave: empreendedorismo corporativo, empreendedorismo interno, intra-empreendedorismo, inovação, mudança organizacional.

  11. Impacto de las redes sociales e internet en la adolescencia: aspectos positivos y negativos

    Directory of Open Access Journals (Sweden)

    L. Elías Arab, Dr.

    2015-01-01

    Full Text Available Este artículo presenta una revisión teórica del impacto, tanto positivo como negativo, de las redes sociales en los adoles- centes y de la relación directa entre esto y el uso o abuso de las nuevas tecnologías. A su vez, se establece el vínculo entre las formas de utilizarlas y las características psicológi- cas individuales, los desarrollos previos de personalidad y el control parental. Se toma como punto de partida el desa- rrollo adolescente asociado a la construcción de la identidad juvenil en el contexto de un nuevo paradigma comunica- cional (cibercomunicación, donde el límite entre lo públi- co y lo privado se torna cada vez más difuso. Se expone la terminología propia de las redes sociales y se pone énfasis en las estrategias de supervisión y control adulto. Se deta- llan los aspectos positivos que las nuevas tecnologías ofre- cen (diversas oportunidades de aprendizaje, entretención, socialización, desarrollo de habilidades, creatividad y me- jora de la motivación al aprendizaje especialmente en ado- lescentes, entre otros y los aspectos negativos asociados (distanciamiento afectivo, pérdida de límites en la comuni- cación y pérdida de la capacidad de escucha, entre otros. Este artículo destaca la necesidad de entregar y estimular modelos de comunicación social reales y una educación en el uso de las nuevas tecnologías. El objetivo es actualizar y orientar a profesionales de la salud sobre los aspectos posi- tivos y/o negativos de las redes sociales en los adolescentes.

  12. Manganese associated nanoparticles agglomerate of iron(III) oxide: synthesis, characterization and arsenic(III) sorption behavior with mechanism.

    Science.gov (United States)

    Gupta, Kaushik; Maity, Arjun; Ghosh, Uday Chand

    2010-12-15

    Three samples of manganese associated hydrous iron(III) oxide (MNHFO), prepared by incinerating metal hydroxide precipitate at T (± 5)=90, 300 and 600°C, showed increase of crystalline nature in XRD patterns with decreasing As(III) removal percentages. TEM images showed the increase of crystallinity from sample-1 (MNHFO-1) to sample-3 (MNHFO-3). Dimensions (nm) of particles estimated were 5.0, 7.0 and 97.5. Optimization of pH indicated that MNHFO-1 could remove aqueous As(III) efficiently at pH between 3.0 and 7.0. Kinetic and equilibrium data of reactions under the experimental conditions described the pseudo-second order and the Langmuir isotherm equations very well, respectively. The Langmuir capacity (q(m)) estimated was 691.04 mmol kg(-1). The values of enthalpy, Gibb's free energy and entropy changes (ΔH(0)=+23.23 kJ mol(-1), ΔG(0)=-3.43 to -7.20 kJ mol(-1) at T=283-323K, ΔS(0)=+0.094 kJ mol(-1)K(-1)) suggested that the reaction was endothermic, spontaneous and took place with increasing entropy. The As(III) sorbed by MNHFO-1 underwent surface oxidation to As(V), and evidences appeared from the XPS and FTIR investigations. MNHFO-1 packed column (internal diameter: 1.0 cm, height: 3.7 cm) filtered 11.5 dm(3) groundwater (105 μg As dm(-3)) with reducing arsenic concentration to ≤ 10 μg dm(-3). Copyright © 2010 Elsevier B.V. All rights reserved.

  13. Evidências neuropsicológicas da existiência de um nódulo de aspecto

    Directory of Open Access Journals (Sweden)

    Celso Novaes

    2012-11-01

    Full Text Available Assumindo que todas as línguas naturais compartilham das mesmascategorias funcionais, mostrando assim um alto grau de uniformidade,este trabalho apresenta algumas evidências neuropsicológicas quedizem respeito à dissociação entre a expressão lingüística de tempoe a expressão lingüística de aspecto, em indivíduos com patologiada linguagem – afasia de Broca. Essas evidências nos permitemdefender a hipótese de que a camada flexional seria formada de pelomenos duas subcamadas, sendo uma dessas a camada que projetaindependentemente os traços de aspecto. Essa hipótese vem aoencontro da proposta de Pollock (1989 de que a camada flexionalseria constituída de dois nódulos e da proposta de Chomsky (1995de que somente os traços semanticamente interpretáveis nas interfaceslingüísticas projetariam uma categoria funcional.

  14. Aspectos ergonômicos relacionados com o ambiente e equipamentos hospitalares Aspectos ergonómicos relacionados con el ambiente y aparatos hospitalarios Ergonomic aspects of the hospital working environment and equipment

    Directory of Open Access Journals (Sweden)

    Neusa Maria Costa Alexandre

    1998-10-01

    Full Text Available A ergonomia tem sido difundida como uma das mais importantes estratégias para reduzir os problemas originados por situações de trabalho que causam lesões no sistema músculo-esquelético. O presente trabalho discute determinados aspectos do ambiente como espaço de trabalho, altura da superfície de trabalho, limites de alcance e equipamentos, relacionando-os com as atividades ocupacionais da enfermagem.La ergonomía ha sido difundida como una de las más importantes estratégias para disminuir los problemas originados por situaciones de trabajo que causan lesiones en el sistema musculosquelético. El presente trabajo discute determinados aspectos del ambiente como espacio de trabajo, altura de la superficie de trabajo, limites del alcance y aparatos, relacionándolos con las actividades ocupacionales de enfermería.Ergonomics has been one of the most important strategies for reducing musculoskeletal injuries caused by working conditions. The present report discusses particular aspects of the working environment such as work space, working heights, as well as the limits of reach and of the equipment used, and attempts to relate these to the occupational activities in nursing.

  15. Synthesis and characterization of La(III), Pr(III), Nd(III), Sm(III), Eu(III), Gd(III), Tb(III) and Dy(III) complexes of 2-acetylfuran-2-thenoylhydrazone

    International Nuclear Information System (INIS)

    Singh, B.; Singh, Praveen K.

    1998-01-01

    The reaction of 2-acetylfuran-2-thenoylhydrazone(afth) with Ln(III) trichlorides yields complexes of the type [Ln(afth)Cl 2 (H 2 O)(EtOH)]Cl, [Ln(III) = La, Pr, Nd, Sm, Eu, Gd, Tb and Dy]. The complexes have been characterized by molar conductance, magnetic susceptibility and TGA and DTA measurements, magnetic susceptibility and TGA and DTA measurements, FAB mass, infrared, proton NMR, electronic absorption and emission spectra. The terbium complex is found to be monomer from the FAB mass spectrum. The IR and NMR spectra suggest neutral tridentate behaviour of the Schiff base. A coordination number seven is proposed around the metal ions. Emission spectra suggest C 3v , symmetry around the metal ion with capped octahedron geometry for the europium complex. (author)

  16. Cinema novo e sua relação com o Modernismo literário: reflexões sobre aspectos similares

    Directory of Open Access Journals (Sweden)

    Julierme Morais

    2017-07-01

    Full Text Available No presente artigo visamos problematizar a relação entre os movimentos culturais brasileiros do Cinema Novo e do Modernismo literário, buscando demonstrar como o movimento cinematográfico potencializado nos anos de 1960 possui alguns aspectos similares ao movimento literário iniciado oficialmente na Semana de Arte Moderna de 1922. Para tanto, abordamos dois aspectos fundamentais. A saber: a adoção das conquistas artísticas de vanguarda, acompanhada da desintegração da linguagem artística tradicional, e a busca da “legítima” expressão artística nacional.

  17. Characterization of biosorption process of As(III) on green algae Ulothrix cylindricum

    International Nuclear Information System (INIS)

    Tuzen, Mustafa; Sari, Ahmet; Mendil, Durali; Uluozlu, Ozgur Dogan; Soylak, Mustafa; Dogan, Mehmet

    2009-01-01

    Arsenic (As) is generally found as As(III) and As(V) in environmental samples. Toxicity of As(III) is higher than As(V). This paper presents the characteristics of As(III) biosorption from aqueous solution using the green algae (Ulothrix cylindricum) biomass as a function of pH, biomass dosage, contact time, and temperature. Langmuir, Freundlich and Dubinin-Radushkevich (D-R) models were applied to describe the biosorption isotherm of As(III) by U. cylindricum biomass. The biosorption capacity of U. cylindricum biomass was found as 67.2 mg/g. The metal ions were desorbed from U. cylindricum using 1 M HCl. The high stability of U. cylindricum permitted 10 times of adsorption-elution process along the studies with a slightly decrease about 16% in recovery of As(III) ions. The mean free energy value evaluated from the D-R model indicated that the biosorption of As(III) onto U. cylindricum biomass was taken place by chemical ion-exchange. The calculated thermodynamic parameters, ΔG o , ΔH o and ΔS o showed that the biosorption of As(III) onto U. cylindricum biomass was feasible, spontaneous and exothermic under examined conditions. Experimental data were also tested in terms of biosorption kinetics using pseudo-first-order and pseudo-second-order kinetic models. The results showed that the biosorption processes of As(III) followed well pseudo-second-order kinetics.

  18. Mapa perceptual no contexto empresarial: aspectos relevantes para a sua elaboração

    Directory of Open Access Journals (Sweden)

    Luiza Venzke Bortoli

    2017-08-01

    Full Text Available Em um ambiente competitivo, torna-se indispensável posicionar-se melhor do que os concorrentes a fim de manter-se no mercado. O mapa perceptual é uma técnica que auxilia na visualização da posição que uma empresa ocupa no mercado em que está inserida. Os benefícios gerados por essa técnica já são vastamente difundidos no mercado consumidor, mas podem auxiliar executivos em tomadas de decisão a respeito do posicionamento de produtos e serviços no mercado industrial (B2B. Esta pesquisa tem por objetivo ressaltar aspectos relevantes a serem considerados na elaboração do mapa perceptual no contexto empresarial. Para verificar a aplicação do mapa perceptual no B2B, foi escolhida uma empresa, cujo principal serviço era o inventário de mercadorias, que presta serviços a outras empresas, em especial varejistas. Para a elaboração do mapa, detectou-se dois atributos relevantes: a percepção sobre o custo do inventário para a empresa contratante; e a percepção sobre a contribuição estratégica do inventário para a gestão da empresa. Ao analisar as percepções dos profissionais quanto aos atributos, verificou-se diferenças decorrentes do setor em que trabalham, indicando que o pesquisador não deve estar restrito ao setor responsável pelo serviço analisado, mas deve obter uma visão ampla do funcionamento organizacional. Com o melhor entendimento da dinâmica organizacional da empresa contratante, a empresa prestadora de serviço pode construir sua proposta de valor para um serviço, posicionando-o de acordo com as percepções do mercado, obtendo maior vantagem competitiva. Como resultado deste estudo, sugere-se que, ao desenvolver o mapa perceptual para o B2B, o pesquisador atente-se para os seguintes pontos: i setor em que o respondente da pesquisa trabalha; ii presença de setores diretamente ligados ao serviço analisado ; iii setores que possam dialogar frequentemente com o responsável pelo serviço em foco; iv

  19. Preparation and characterisation of mixed ligand complexes of Co(III), Fe(III) and Cr(III) containing phthalimide and phenols

    International Nuclear Information System (INIS)

    Miah, M.A.J.; Islam, M.S.; Pal, S.C.; Barma, T.K.

    1996-01-01

    Some novel mixed ligand complexes of Co(III), Fe(III) and Cr(III) containing phthalimide as primary and 2-aminophenol and 3-aminophenol as secondary ligands have been synthesized and characterised on the basis of elemental analyses, conductivity and magnetic measurements and infrared and electronic spectral studies. Complexes containing 2-aminophenol are 1:1 electrolyte in N,N dimethylformamide. Spectral studies indicate that all the complexes exhibit octahedral geometry. The complexes have the general composition; K[M(pim)/sub 2/(L)/sub 2/]; where m=Co(III), Fe(III) and Cr(III), pim-anion of phthalimamide and L=anion of 2-aminophenol and 3-aminophenol. (author)

  20. La Entomofagia en México. Algunos aspectos culturales

    Directory of Open Access Journals (Sweden)

    Felipe Carlos Viesca González

    2009-01-01

    Full Text Available En este trabajo se abordan aspectos culturales del consumo de insectos con fines alimenticios en México y el mundo; particularmente se analiza la entomofagia en la época prehispánica y nuestros días, así como las causas por las cuales ha disminuido el consumo de estos artrópodos. Se explica porqué se ha creado una aversión hacia los insectos en diversos países y algunas regiones de México. Se reflexiona acerca del valor nutritivo de los insectos y las distintas culturas que han hecho posible que sobreviva esta práctica culinaria en el centro y sur del territorio nacional, algunas formas de preparar platillos basados en insectos, así como los problemas que enfrenta actualmente esta costumbre alimenticia entre los mexicanos y sus perspectivas.

  1. 9,10-phenanthrenesemiquinone radical complexes of ruthenium(III), osmium(III) and rhodium(III) and redox series.

    Science.gov (United States)

    Biswas, Manas Kumar; Patra, Sarat Chandra; Maity, Amarendra Nath; Ke, Shyue-Chu; Weyhermüller, Thomas; Ghosh, Prasanta

    2013-05-14

    Reactions of 9,10-phenanthrenequinone (PQ) in toluene with [M(II)(PPh3)3X2] at 298 K afford green complexes, trans-[M(PQ)(PPh3)2X2] (M = Ru, X = Cl, 1; M = Os, X = Br, 2) in moderate yields. Reaction of anhydrous RhCl3 with PQ and PPh3 in boiling ethanol affords the dark brown paramagnetic complex, cis-[Rh(PQ)(PPh3)2Cl2] (3) in good yields. Diffusion of iodine solution in n-hexane to the trans-[Os(PQ) (PPh3)2(CO)(Br)] solution in CH2Cl2 generates the crystals of trans-[Os(PQ)(PPh3)2(CO)(Br)](+)I3(-), (4(+))I3(-)), in lower yields. Single crystal X-ray structure determinations of 1·2toluene, 2·CH2Cl2 and 4(+)I3(-), UV-vis/NIR absorption spectra, EPR spectra of 3, electrochemical activities and DFT calculations on 1, 2, trans-[Ru(PQ)(PMe3)2Cl2] (1Me), trans-[Os(PQ)(PMe3)2Br2] (2Me), cis-[Rh(PQ)(PMe3)2Cl2] (3Me) and their oxidized and reduced analogues including trans-[Os(PQ)(PMe3)2(CO)(Br)](+) (4Me(+)) substantiated that 1-3 are the 9,10-phenanthrenesemiquinone radical (PQ(˙-)) complexes of ruthenium(III), osmium(III) and rhodium(III) and are defined as trans/cis-[M(III)(PQ(˙-))(PPh3)2X2] with a minor contribution of the resonance form trans/cis-[M(II)(PQ)(PPh3)2X2]. Two comparatively longer C-O (1.286(4) Å) and the shorter C-C lengths (1.415(7) Å) of the OO-chelate of 1·2toluene and 2·CH2Cl2 and the isotropic fluid solution EPR signal at g = 1.999 of 3 are consistent with the existence of the reduced PQ(˙-) ligand in 1-3 complexes. Anisotropic EPR spectra of the frozen glasses (g11 = g22 = 2.0046 and g33 = 1.9874) and solids (g11 = g22 = 2.005 and g33 = 1.987) instigate the contribution of the resonance form, cis-[Rh(II)(PQ)(PPh3)2Cl2] in 3. DFT calculations established that the closed shell singlet (CSS) solutions of 1Me and 2Me are unstable due to open shell singlet (OSS) perturbation. However, the broken symmetry (BS) (1,1) Ms = 0 solutions of 1Me and 2Me are respectively 22.6 and 24.2 kJ mole(-1) lower in energy and reproduced the experimental bond

  2. Aspectos legales al utilizar las principales redes sociales en Colombia

    Directory of Open Access Journals (Sweden)

    Manuel Adolfo Alvarado Carmona

    2017-01-01

    Full Text Available Se analizaron los aspectos legales al utilizar las dos principales redes sociales en Colombia como los son facebook y twitter. Cuando un usuario se conecta a cualquiera de las redes sociales debe hacerlo de forma responsable porque de lo contrario puede incurrir en la violación de la normatividad Colombiana en la cual se encuentran los delitos informáticos, la protección de la información y los datos, injuria y calumnia, ciberacoso y derechos de autor. Se determinaron los problemas que conllevan cuando no se utiliza bien la información en las redes sociales en el ámbito jurídico.

  3. Experimental evidence for cobalt(III)-carbene radicals: key intermediates in cobalt(II)-based metalloradical cyclopropanation

    NARCIS (Netherlands)

    Lu, H.; Dzik, W.I.; Xu, X.; Wojtas, L.; de Bruin, B.; Zhang, X.P.

    2011-01-01

    New and conclusive evidence has been obtained for the existence of cobalt(III)-carbene radicals that have been previously proposed as the key intermediates in the underlying mechanism of metalloradical cyclopropanation by cobalt(II) complexes of porphyrins. In the absence of olefin substrates,

  4. Biological activity of Fe(III) aquo-complexes towards ferric chelate reductase (FCR).

    Science.gov (United States)

    Escudero, Rosa; Gómez-Gallego, Mar; Romano, Santiago; Fernández, Israel; Gutiérrez-Alonso, Ángel; Sierra, Miguel A; López-Rayo, Sandra; Nadal, Paloma; Lucena, Juan J

    2012-03-21

    In this study we have obtained experimental evidence that confirms the high activity of aquo complexes III and IV towards the enzyme FCR, responsible for the reduction of Fe(III) to Fe(II) in the process of iron acquisition by plants. The in vivo FCR assays in roots of stressed cucumber plants have shown a higher efficiency of the family of complexes III and a striking structure-activity relationship with the nature of the substituent placed in a phenyl group far away from the metal center. The results obtained in this work demonstrate that all the aquo compounds tested interact efficiently with the enzyme FCR and hence constitute a new concept of iron chelates that could be of great use in agronomy.

  5. ASPECTOS CLÍNICOS DA INTOXICAÇÃO EXPERIMENTAL DE BOVINOS PELOS FRUTOS DE Stryphnodendron fissuratum MART. (“ROSQUINHA”

    Directory of Open Access Journals (Sweden)

    Adriano Felipe Arantes

    2006-10-01

    Full Text Available Neste experimento foram utilizados quinze bovinos machos, mestiços, com idades entre dez e quatorze meses, pesando entre 96 e 214 kg e divididos em três grupos, com cinco animais cada. Os animais dos grupos I, II e III foram submetidos à ingestão forçada de 30g/kg, 20g/kg e 10g/kg de peso vivo de frutos triturados de Stryphnodendron fissuratum (“rosquinha”, respectivamente, em uma única parcela. Um animal de cada grupo foi considerado como controle e, portanto, não recebeu o tratamento estabelecido para o seu respectivo grupo. Observaram-se algumas variações clínicas relacionadas à dose e ao tempo, contudo o quadro tóxico caracterizou-se predominantemente, nos três grupos, por apatia, pêlos eriçados, atonia ou hipotonia rumenal, anorexia, ausência de ruminação, fezes pastosas ou sob a forma de cíbalos, fétidas e algumas vezes enegrecidas. Subseqüentemente, observaram-se bruxismo, mugido prolongado, sialorréia espumosa, movimentos vazios de apreensão de alimentos, desidratação, lacrimejamento, midríase com reflexo pupilar presente, mania de lamber de forma contínua objetos ou partes do corpo, principalmente membros anteriores, incoordenação, tremores do pescoço e cabeça, posicionamento em decúbito external com a cabeça desviada em direção ao flanco ou apoiada no solo pelo muflo nasal. Os animais intoxicados dos grupos I, II e III vieram a óbito nos intervalos de 2 a 5 dias, 3 a 8 dias e 6 a 11 dias, respectivamente. PALAVRAS-CHAVE: Bovino, plantas tóxicas, Stryphnodendron fissuratum.

  6. Audición espacial en ambientes reverberantes: aspectos teóricos relevantes

    OpenAIRE

    Claudia Arias; Oscar A. Ramos

    2003-01-01

    En ambientes reverberantes el sonido se propaga en múltiples direcciones sufriendo cambios físicos de importancia. El sistema auditivo debe se capaz de resolver la competencia perceptual que se produce entre el sonido original y sus reflexiones. En este artículo se presentan aspectos teóricos relevantes de la audición espacial con especial tratamiento del efecto precedente. Se trata de una estrategia inconciente que el individuo utiliza para enfrentar la información sonora conf...

  7. Selective transport of Fe(III) using ionic imprinted polymer (IIP) membrane particle

    Science.gov (United States)

    Djunaidi, Muhammad Cholid; Jumina, Siswanta, Dwi; Ulbricht, Mathias

    2015-12-01

    The membrane particles was prepared from polyvinyl alcohol (PVA) and polymer IIP with weight ratios of 1: 2 and 1: 1 using different adsorbent templates and casting thickness. The permeability of membrane towards Fe(III) and also mecanism of transport were studied. The selectivity of the membrane for Fe(III) was studied by performing adsorption experiments also with Cr(III) separately. In this study, the preparation of Ionic Imprinted Polymer (IIP) membrane particles for selective transport of Fe (III) had been done using polyeugenol as functional polymer. Polyeugenol was then imprinted with Fe (III) and then crosslinked with PEGDE under alkaline condition to produce polyeugenol-Fe-PEGDE polymer aggregates. The agrregates was then crushed and sieved using mesh size of 80 and the powder was then used to prepare the membrane particles by mixing it with PVA (Mr 125,000) solution in 1-Methyl-2-pyrrolidone (NMP) solvent. The membrane was obtained after casting at a speed of 25 m/s and soaking in NaOH solution overnight. The membrane sheet was then cut and Fe(III) was removed by acid to produce IIP membrane particles. Analysis of the membrane and its constituent was done by XRD, SEM and size selectivity test. Experimental results showed the transport of Fe(III) was faster with the decrease of membrane thickness, while the higher concentration of template ion correlates with higher Fe(III) being transported. However, the transport of Fe(III) was slower for higher concentration of PVA in the membrane. IImparticles works through retarded permeation mechanism, where Fe(III) was bind to the active side of IIP. The active side of IIP membrane was dominated by the -OH groups. The selectivity of all IIP membranes was confirmed as they were all unable to transport Cr (III), while NIP (Non-imprinted Polymer) membrane was able transport Cr (III).

  8. Medicina Genómica Aspectos éticos, legales y sociales del Genoma Humano

    Directory of Open Access Journals (Sweden)

    Rodolfo E. Ávila

    2011-01-01

    Full Text Available La Medicina Genómica es el uso de la inf ormación de los genomas y sus deriv ados (ARN, proteínas y met abolitos que permite guiar la toma de decisiones médicas, es un c omponente clave de la medicina personalizada. La Medicina Genómica permite conocer la cartografía del genoma hum ano y proporciona una valiosa información a tener en cuenta a la hora de detect ar genes implicados en ciert as enfermedades. Esto conlleva a que en la actualidad nos centremos más en la predicción de patologías que en l a prevención, por lo que la tendencia es que en el futuro la Medicina Genómica acabe desbancando a la Medicina P reventiva. El Proyecto Genoma Humano presenta diversas aplicaciones que, al no tener una clara cobert ura legal, traen consigo un nuevo paradigma con problemas éticos, sociales y legales que la comunidad científica trat a de resolver para compaginar los aspectos morales con el progreso en la investigación. El objetivo del presente trabajo es describir brevemente los aspectos éticos, legales y sociales del Genoma Humano.

  9. Thermodynamic data for predicting concentrations of Pu(III), Am(III), and Cm(III) in geologic environments

    Energy Technology Data Exchange (ETDEWEB)

    Rai, Dhanpat; Rao, Linfeng; Weger, H.T.; Felmy, A.R. [Pacific Northwest National Laboratory, WA (United States); Choppin, G.R. [Florida State University, Florida (United States); Yui, Mikazu [Japan Nuclear Cycle Development Inst., Tokai Works, Tokai, Ibaraki (Japan)

    1999-01-01

    This report provides thermodynamic data for predicting concentrations of Pu(III), Am(III), and Cm(III) in geologic environments, and contributes to an integration of the JNC chemical thermodynamic database, JNC-TDB (previously PNC-TDB), for the performance analysis of geological isolation system for high-level radioactive wastes. Thermodynamic data for the formation of complexes or compounds with hydroxide, chloride, fluoride, carbonate, nitrate, sulfate and phosphate are discussed in this report. Where data for specific actinide(III) species are lacking, the data were selected based on chemical analogy to other trivalent actinides. In this study, the Pitzer ion-interaction model is mainly used to extrapolate thermodynamic constants to zero ionic strength at 25degC. (author)

  10. Study of III-V semiconductor band structure by synchrotron photoemission

    International Nuclear Information System (INIS)

    Williams, G.P.; Cerrina, F.; Anderson, J.; Lapeyre, G.J.; Smith, R.J.; Hermanson, J.; Knapp, J.A.

    1982-01-01

    Angle-resolved synchrotron photoemission studies of six III-V semiconductors have been carried out. For emission normal to the (110) plane of these materials, peaks in the experimental spectra were identified with the bands involved in the transitions, and the critical point energies X 3 , X 5 , and Σ 1 /sup min/, were determined. The data indicate that k perpendicular is conserved in the transitions. Comparison of the data with theoretical bands permits an evaluation of k perpendicular associated with the experimentally observed transition, and from this information the bands were plotted out

  11. Luminescence study on solvation of americium(III), curium(III) and several lanthanide(III) ions in nonaqueous and binary mixed solvents

    International Nuclear Information System (INIS)

    Kimura, T.; Nagaishi, R.; Kato, Y.; Yoshida, Z.

    2001-01-01

    The luminescence lifetimes of An(III) and Ln(III) ions [An=Am and Cm; Ln=Nd, Sm, Eu, Tb and Dy] were measured in dimethyl sulfoxide(DMSO), N,N-dimethylformamide(DMF), methanol(MeOH), water and their perdeuterated solvents. Nonradiative decay rates of the ions were in the order of H 2 O > MeOH > DMF > DMSO, indicating that O-H vibration is more effective quencher than C-H, C=O, and S=O vibrations in the solvent molecules. Maximal lifetime ratios τ D /τ H were observed for Eu(III) in H 2 O, for Sm(III) in MeOH and DMF, and for Sm(III) and Dy(III) in DMSO. The solvent composition in the first coordination sphere of Cm(III) and Ln(III) in binary mixed solvents was also studied by measuring the luminescence lifetime. Cm(III) and Ln(III) were preferentially solvated by DMSO in DMSO-H 2 O, by DMF in DMF-H 2 O, and by H 2 O in MeOH-H 2 O over the whole range of the solvent composition. The order of the preferential solvation, i.e., DMSO > DMF > H 2 O > MeOH, correlates with the relative basicity of these solvents. The Gibbs free energy of transfer of ions from water to nonaqueous solvents was further estimated from the degree of the preferential solvation. (orig.)

  12. Luminescence studies of Sm(III) and Cm(III) complexes in NaSCN/DHDECMP extraction systems

    CERN Document Server

    Chung, D Y; Kimura, T

    1999-01-01

    Laser-induced fluorescence (LIF) studies of Sm(III) and Cm(III) complexes in the NaSCN/DHDECMP solvent extraction system were carried out. Luminescence lifetimes were measured to determine the number of water molecules coordinated to Sm(III), Tb(III), Dy(III), and Cm(III) in the sodium thiocyanate solution and in the DHDECMP phase. The hydration number of Sm(III), Tb(III), Dy(III), and Cm(III) in the sodium thiocyanate solution decreased linearly with increasing sodium thiocyanate concentration. The hydration numbers of Sm(III), Dy(III), and Cm(III) in the DHDECMP phase decreased with increasing sodium thiocyanate concentration. The water molecules in the inner coordination sphere of Sm(III) and Dy(III) extracted into the DHDECMP were not completely removed at low sodium thiocyanate concentration but decreased with increasing sodium thiocyanate concentration. However, in the case of Cm(III) extracted into the DHDECMP phase from the sodium thiocyanate solution, there was no water in the inner coordination sphe...

  13. Iron(III) protoporphyrin IX-single-wall carbon nanotubes modified electrodes for hydrogen peroxide and nitrite detection

    International Nuclear Information System (INIS)

    Turdean, Graziella L.; Popescu, Ionel Catalin; Curulli, Antonella; Palleschi, Giuseppe

    2006-01-01

    Iron(III) protoporphyrin IX (Fe(III)P), adsorbed either on single-walled carbon nanotubes (SWCNT) or on hydroxyl-functionalized SWCNT (SWCNT-OH), was incorporated within a Nafion matrix immobilized on the surface of a graphite electrode. From cyclic voltammetric measurements, performed under different experimental conditions (pH and potential scan rate), it was established that the Fe(III)P/Fe(II)P redox couple involves 1e - /1H + . The heterogeneous electron transfer process occurred faster when Fe(III)P was adsorbed on SWCNT-OH (∼11 s -1 ) than on SWCNT (∼4.9 s -1 ). Both the SWCNT-Fe(III)P- and SWCNT-OH-Fe(III)P-modified graphite electrodes exhibit electrocatalytic activity for H 2 O 2 and nitrite reduction. The modified electrodes sensitivities were found varying in the following sequences: S SWCNT-OH-Fe(III)P = 2.45 mA/M ∼ S SWCNT-Fe(III)P = 2.95 mA/M > S Fe(III)P = 1.34 mA/M for H 2 O 2 , and S SWCNT-Fe(III)P = 3.54 mA/M > S Fe(III)P 1.44 mA/M > S SWCNT-OH-Fe(III)P = 0.81 mA/M for NO 2 -

  14. Association of Eu(III) and Cm(III) with Bacillus subtilis and Halobacterium salinarum

    International Nuclear Information System (INIS)

    Ozaki, Takuo; Kimura, Takaumi; Ohnuki, Toshihiko; Yoshida, Zenko

    2002-01-01

    Adsorption behavior of Eu(III) and Cm(III) by Bacillus subtilis and Halobacterium salinarum was investigated. Both microorganisms showed almost identical pH dependence on the distribution ratio (K d ) of the metals examined, i.e., K d of Eu(III) and Cm(III) increased with an increase of pH. The coordination state of Eu(III) adsorbed on the microorganisms was studied by time-resolved laser-induced fluorescence spectroscopy (TRLFS). The coordination states of Eu(III) adsorbed on the B. subtilis and H. salinarum was of different characteristics. H. salinarum exhibited more outer-spherical interaction with Eu(III) than B. subtilis. (author)

  15. Bulls semen quality of Aberdeen Angus and Brangus-Ibagé breeds after experimental testicular degeneration induced by dexamethasone

    OpenAIRE

    Horn, Marilise Mesquita; Moraes, José Carlos Ferrugem; Galina, Carlos Salvador

    1999-01-01

    Foi administrada dexametasona para indução de degeneração testicular experimental em touros de uma raça taurina pura (Aberdeen Angus) e de sua sintética derivada (Brangus-Ibagé). O objetivo deste estudo foi o de averiguar a diferença de sensibilidade na função gametogênica em frente à degeneração experimental. Para tal, foram avaliados os aspectos físicos e morfológicos do sêmen. Os dados obtidos foram analisados considerando o dia de coleta e genótipo. Os resultados revelaram que os dois gru...

  16. Aspectos claves relacionados con la gestión del e.Learning

    OpenAIRE

    Francisco Lupiáñez Villanueva

    2006-01-01

    La introducción y uso de las Tecnologías de la Información y la Comunicación, especialmente Internet, en el ámbito de la salud, la medicina y los sistemas sanitarios enfrenta a todos los agentes e instituciones ante numerosos retos. La educación y la formación, como actividades claves tanto de la sociedad de la información como de los sistemas sanitarios, también se ven afectadas por este proceso de cambio. La finalidad de este artículo es identificar y analizar algunos de los aspectos claves...

  17. ASPECTOS TAXONÔMICOS, FITOGEOGRÁFICOS E USOS DE Pectis uniaristata DC. var. jangadensis (S.Moore) Keil (ASTERACEAE)

    OpenAIRE

    PEREIRA, ARILDO GONÇALO; NETO, GERMANO GUARIM

    2014-01-01

    Este trabalho discute os aspectos taxonômicos, fitogeográficos e outros relacionados à Pectis uniaristata var. jangadensis (S. Moore) Keil (Asteraceae) uma planta de ocorrência na vegetação do cerrado e do pantanal de Mato Grosso.

  18. Tratamiento Temprano de la Maloclusión Clase III con aparatología Ortopédica: Reporte de caso con 7 años de control

    Directory of Open Access Journals (Sweden)

    Alzate-J

    2014-01-01

    Full Text Available Una de las maloclusiones más complejas de diagnosticar y de tratar es la maloclusión clase III.\tSe caracteriza por una alteración en la relación sagital de los maxilares, ya sea por una deficiencia o retrusión maxilar o por un prognatismo o macrognatismo mandibular, o bien sea una combinación de las anteriores. La etiología es multifactorial y es debida a una interacción de factores hereditarios y ambientales. Se presenta una paciente de 4 años de edad, sexo femenino, con patrón hereditario de clase III en su familia materna. Relación esquelética clase III con mandíbula aumentada en longitud, protruida, rotando posterior y maxilar superior retruído. Tipo de crecimiento vertical, con un perfil recto y mordida cruzada anterior y posterior unilateral izquierda. Se instauró tratamiento con aparatología ortopédica durante el periodo de dentición decidua hasta la dentición permanente, para lograr así, equilibrar el crecimiento maxilomandibular. Uno de los aspectos clínicos más complicados del manejo ortopédico de la maloclusión clase III es la recidiva después del período de tratamiento activo; sin embargo en nuestra paciente se consiguen cambios a nivel esquelético, dental y estéticos que se mantuvieron durante el tratamiento

  19. Sorption of Cr(III) ion from aqueous solution by two kinds of modified diatomite.

    Science.gov (United States)

    Li, Er; Zeng, Xiangying

    2012-01-01

    Raw diatomite modified by microemulsion (DMM) and manganese oxide (MnD) were used for the removal of Cr(III) ions from aqueous solution. The characteristics and performance of these two types of modified diatomite on Cr(III) ion adsorption were compared. The results indicate that the Cr(III) ion adsorption capacities of diatomite were considerably improved after modifications by manganese oxide (MnO) and microemulsion. The surface area of MnD was increased because of the formation of MnO on the diatomite surface, and that of DMM was promoted owing to the existence of the hydrolyzed aromatic acid. Because of the stronger surface ionized function, the adsorption performance of Cr(III) ions in DMM was better than that in MnD. Within the experimental range of pH (i.e. 2.2-6.3), the Cr(III) ion removal of DMM (35-70%) was higher than that of MnD (33-59%) owing to the different electrostatic forces between the Cr(III) ion and the surface of the modified diatomite. The Cr(III) ion removal in MnD and DMM was improved with the increase of synthetic solution concentration in volumes from 0 to 2,500 mL.

  20. Spectrophotometric Determination of Chromium (III) in Egyptian 11 manite from phosphate solution using Ewes as a selective adsorbent

    International Nuclear Information System (INIS)

    Abdu, A. A.

    2012-12-01

    Egyptian white sand (EWS) was used as an adsorbent for the selective separation of Cr(III) from phosphate solution to be determined colorimetrically using 1,5-diphenylcarbazide. The experimental factors affecting maximum selective adsorption/desorption of Cr(III) on / from EWS were the amount of adsorption (g), pH of initial concentration of Cr(III) in solution, contact time temperature and initial concentration of Cr(III) in solution were investigated. No effect of [PO 4 ] 3- , Ti(IV) and Fe(III) on Cr(III) sorption were verified. Accuracy and relative standard deviations (RSD) were acceptable for all analyses. The maximum sorption capacity, Q e , of adsorbed Cr(III) per gram of sand was 93.5 mg/g, at EWS concentration 20 g/1, pH 0.8 contact time 120 min and temperature 30 o C for adsorption of Cr(III) on EWS and pH 0.4, contact time 6 min and temperature 25o C for desorption of Cr(III) from EWS. (Author)

  1. Sorption of small amounts of europium(III) on iron(III) hydroxide and oxide

    International Nuclear Information System (INIS)

    Music, S.; Gessner, M.; Wolf, R.H.H.

    1979-01-01

    The sorption of small amounts of europium(III) on iron(III) hydroxide and oxide has been studied as a function of pH. The mechanism of sorption is discussed. Optimum conditions have been found for the preconcentration of small or trace amounts of europium(III) by iron(III) hydroxide and oxide. The influence of complexing agents (EDTA, oxalate, tartrate and 5-sulfosalicylic acid) on the sorption of small amounts of europium(III) on iron(III) oxide has also been studied. (author)

  2. Adsorption of gold (III) from aqueous solutions on bagasse ash

    International Nuclear Information System (INIS)

    Hussain, G.; Khan, M.A.

    2011-01-01

    To assess the potential of cheap biomass materials for the recovery of gold from industrial, and electroplating waste water effluents, adsorption of gold (III) from dilute solutions of hydrochloric acid on bagasse ash has been studied under various experimental conditions by using batch technique. Percentage extraction of gold (III) on bagasse ash was determined from its distribution coefficients as a function of contact time, pH, adsorbent, adsorbate concentrations, and temperature. The uptake of gold (III) by bagasse ash is time, pH, metal concentration, amount of adsorbate, and temperature dependent. Adsorption data have been interpreted in terms of Langmuir, and the Freundlich equations. Thermodynamic parameters for the adsorption of gold (III) on bagasse ash have been determined at three different temperatures. The positive value of heat of adsorption; delta H 44.52 kJ/mol shows that the adsorption of gold (III) on bagasse ash is endothermic where as the negative value of delta G = -0.5303 kJ/mol at 318 K shows the spontaneity of the process. Delta G becomes more negative with increase in temperature which shows that the adsorption is more favorable at higher temperatures. Under the optimal adsorption conditions the adsorption capacity of gold is 0.70 mg /g of the adsorbent out of which 0.65 mg of gold gets desorbed with 0.1 % thiourea solution. (author)

  3. Structure and luminescent investigation of new Ln(III)-TTA complexes containing N-methyl-ε-caprolactam as ligand

    Energy Technology Data Exchange (ETDEWEB)

    Borges, Alex Santos, E-mail: alexb@ifes.edu.br [Coordenadoria de Química e Biologia, IFES, Vitória, ES 29040-780 (Brazil); Caliman, Ewerton Valadares [Coordenadoria de Engenharia Metalúrgica, IFES, Vitória, ES 29040-780 (Brazil); Dutra, José Diogo L. [Departamento de Química Fundamental, UFPE, Recife, PE 50590-470 (Brazil); Da Silva, Jeferson G. [Departamento de Farmácia, UFJF, Governador Valadares, MG 35010-17 (Brazil); Araujo, Maria Helena, E-mail: maria.araujo@pq.cnpq.br [Departamento de Química, UFMG, Belo Horizonte, MG 31270-901 (Brazil)

    2016-02-15

    The synthesis and photoluminescent properties of Ln(III)-TTA complexes (Ln=Eu(III) and Sm(III) ions; TTA=3-thenoyltrifluoroacetonate) with N-methyl-ε-caprolactam (NMC) are reported. The Ln complexes were characterized by elemental analysis, complexometric titration with EDTA and infrared spectroscopy. The molecular structures of the [Eu(TTA){sub 3}(NMC)(H{sub 2}O)] and [Sm(TTA){sub 3}(NMC)(H{sub 2}O)]·H{sub 2}O compounds were determined by single crystal X-ray crystallography. In these structures, the three TTA molecules are coordinated to the metal in anionic form as bidentate ligands, while the H{sub 2}O and NMC molecules are coordinated to the metal in neutral form as monodentated ligands. The coordination polyhedron around the Ln(III) atom can be described as square antiprismatic molecular geometry. The geometry of the [Eu(TTA){sub 3}(NMC)(H{sub 2}O)] complex was optimized with the Sparkle/RM1 model for Ln(III) complexes, allowing analysis of intramolecular energy transfer processes of the Eu(III) compound. The spectroscopic properties of the 4f{sup 6} intraconfigurational transitions of the Eu(III) complex were then studied experimentally and theoretically. The low value of emission quantum efficiency of {sup 5}D{sub 0} emitting level (η) of Eu(III) ion (ca. 36%) is due to the vibrational modes of the water molecule that act as luminescence quenching. In addition, the luminescence decay curves, the experimental intensity parameters (Ω{sub λ}), lifetimes (τ), radiative (A{sub rad}) and non-radiative (A{sub nrad}) decay rates, theoretical quantum yield (q{sub cal}) were also determined and discussed. - Highlights: • New Ln-TTA complexes with lactam were obtained and their luminescence investigated. • Jablonsky diagram for the Eu(III) complex shows the main channel for the IET process. • Data confirm the potentiality of the Eu(III) complex to produce red luminescence. • LUMPAC has provided useful information on the luminescence of the Eu(III

  4. Aspectos Éticos de la Investigación Clínica en seres humanos Clinic research in human beings: Ethical aspect

    Directory of Open Access Journals (Sweden)

    Carlos M Albornoz López del Castillo

    2003-08-01

    Full Text Available La ética de la experimentación con seres humanos no es sólo una de las áreas fundamentales de la bioética, sino también una de las problemáticas que le dieron origen. Se describen en este trabajo algunas implicaciones éticas de la experimentación en seres humanos; se analizan el origen y evolución de la bioética, los aspectos regulatorios para la realización de ensayos clínicos y su valoración moral, los tipos de experimentación; la realidad mundial y cubana en cuanto a investigación clínica y tecnología y el consentimiento informado. Se concluye que el criterio ético fundamental de las investigaciones en seres humanos es su disposición al servicio del hombreThe ethics of experimentation with human beings is not only one of the fundamental areas of bioethics, but also one of the problems that originated this field. In this work some ethical implications of experimentation in human beings are described; the origin and evolution of bioethics are analyzed, the regulatory aspects for the realization of clinical trials and their moral valuation, the experimentation types; international and Cuban reality as for clinical investigation and technology and the informed consent. It is assumed that the fundamental ethical approach of the investigations with human beings is its disposition to serve mankind

  5. Stability hierarchy between Piracetam forms I, II, and III from experimental pressure-temperature diagrams and topological inferences.

    Science.gov (United States)

    Toscani, Siro; Céolin, René; Minassian, Léon Ter; Barrio, Maria; Veglio, Nestor; Tamarit, Josep-Lluis; Louër, Daniel; Rietveld, Ivo B

    2016-01-30

    The trimorphism of the active pharmaceutical ingredient piracetam is a famous case of polymorphism that has been frequently revisited by many researchers. The phase relationships between forms I, II, and III were ambiguous because they seemed to depend on the heating rate of the DSC and on the history of the samples or they have not been observed at all (equilibrium II-III). In the present paper, piezo-thermal analysis and high-pressure differential thermal analysis have been used to elucidate the positions of the different solid-solid and solid-liquid equilibria. The phase diagram, involving the three solid phases, the liquid phase and the vapor phase, has been constructed. It has been shown that form III is the high-pressure, low-temperature form and the stable form at room temperature. Form II is stable under intermediary conditions and form I is the low pressure, high temperature form, which possesses a stable melting point. The present paper demonstrates the strength of the topological approach based on the Clapeyron equation and the alternation rule when combined with high-pressure measurements. Copyright © 2015 Elsevier B.V. All rights reserved.

  6. Electrochemistry of carbonaceous materials; 1. Oxidation of Sardinian coal by Fe(III) ions

    Energy Technology Data Exchange (ETDEWEB)

    Tomat, R.; Salmaso, R.; Zecchin, S. (CNR-Instituto di Polarografia ed Elettrochimica Preparativa, Padova (Italy))

    1992-04-01

    Oxidation of subbitiminous coal (Sulcis basin, Sardinia, Italy) by Fe(III) ions in aqueous H{sub 2}SO{sub 4} solution was investigated over a wide temperature range (20-80{degree}C). Experimental results are in accord with a reaction scheme involving a reversible complex between coal particles and Fe(III) ions as a first step in the oxidation process. At low coal concentration, the reaction rate follows first-order kinetics in both coal and ferric ions (overall second order), while at sufficiently high coal concentration, the reaction rate is consistent with first-order kinetics in Fe(III) concentration, appearing to be independent of coal concentration. The kinetic results obtained give preliminary information on the advantageous use of the Fe(III)/slurried coal reaction system to depolarize the anodic compartment of an electrolysis cell, for the production of H{sub 2}. 11 refs., 5 figs.

  7. Optimization of magnetic field system for glass spherical tokamak GLAST-III

    International Nuclear Information System (INIS)

    Ahmad, Zahoor; Ahmad, S; Naveed, M A; Deeba, F; Javeed, M Aqib; Batool, S; Hussain, S; Vorobyov, G M

    2017-01-01

    GLAST-III (Glass Spherical Tokamak) is a spherical tokamak with aspect ratio A = 2. The mapping of its magnetic system is performed to optimize the GLAST-III tokamak for plasma initiation using a Hall probe. Magnetic field from toroidal coils shows 1/ R dependence which is typical with spherical tokamaks. Toroidal field (TF) coils can produce 875 Gauss field, an essential requirement for electron cyclotron resonance assisted discharge. The central solenoid (CS) of GLAST-III is an air core solenoid and requires compensation coils to reduce unnecessary magnetic flux inside the vessel region. The vertical component of magnetic field from the CS in the vacuum vessel region is reduced to 1.15 Gauss kA −1 with the help of a differential loop. The CS of GLAST can produce flux change up to 68 mVs. Theoretical and experimental results are compared for the current waveform of TF coils using a combination of fast and slow capacitor banks. Also the magnetic field produced by poloidal field (PF) coils is compared with theoretically predicted values. It is found that calculated results are in good agreement with experimental measurement. Consequently magnetic field measurements are validated. A tokamak discharge with 2 kA plasma current and pulse length 1 ms is successfully produced using different sets of coils. (paper)

  8. Monte-Carlo simulation of crystallographical pore growth in III-V-semiconductors

    International Nuclear Information System (INIS)

    Leisner, Malte; Carstensen, Juergen; Foell, Helmut

    2011-01-01

    The growth of crystallographical pores in III-V-semiconductors can be understood in the framework of a simple model, which is based on the assumption that the branching of pores is proportional to the current density at the pore tips. The stochastic nature of this model allows its implementation into a three-dimensional Monte-Carlo-simulation of pore growth. The simulation is able to reproduce the experimentally observed crysto pore structures in III-V-semiconductors in full quantitative detail. The different branching probabilities for different semiconductors, as well as doping levels, can be deduced from the specific passivation behavior of the semiconductor-electrolyte-interface at the pore tips.

  9. Experimental investigation of aluminum complexing with sodium ion and of gallium and iron (III) speciation in natural solutions

    International Nuclear Information System (INIS)

    Diakonov, Igor

    1995-01-01

    The aim of this work is to acquire thermodynamic data on the aqueous complexes forming between sodium and aluminum, gallium and hydroxide, and iron (III) and hydroxide. These data will provide for a better understanding of the transport and distribution of these elements in surface and hydrothermal fluids. Stability constants of the sodium-aluminate complex (Na Al(OH) 4 deg.) were obtained from boehmite solubility measurements at temperatures from 125 to 350 deg. C in alkaline solutions containing from 0.1 to 1 mol/L sodium. Complementary potentiometric measurements were performed with a sodium selective electrode, between 75 and 200 deg C (the potentiometric study was carried out by Gleb Pokrovski). Analyses of these data within the framework of the revised Helgeson-Kirkham-Flowers (HKF) model allowed determination of the HKF parameters for Na Al(OH) 4 deg. and calculation of its thermodynamic properties to 800 deg. C and 5 kb. The results of this work show that Na Al(OH) 4 deg. complex formation increases significantly the solubility of aluminum-bearing minerals and consequently aluminum mobility in hydrothermal fluids. Gallium speciation in surface and hydrothermal fluids is dominated by the negatively charged species, Ga(OH) 4 - . The thermodynamic properties of this species were determined from of OEGaOOH solubility measurements as a function of pH and temperature from 25 to 250 deg. C. In general, the variation of gallium aqueous speciation with pH is similar to that of aluminum other than at temperatures less than 200 deg. C over the pH range 3 - 6. This difference can account for the independent behavior of gallium versus aluminum in numerous low temperature natural systems. The thermodynamic properties of Fe(OH) 3 deg. which dominates the speciation of Fe(III) in surface waters and Fe(OH) 4 - were determined from hematite solubility measurements as a function of pH, oxygen pressure and temperature from 110 to 300 deg. C. The available thermodynamic data on

  10. Summary report of the experimental fast reactor JOYO MK-III performance test

    International Nuclear Information System (INIS)

    Maeda, Yukimoto; Aoyama, Takafumi; Yoshida, Akihiro

    2004-03-01

    An upgrading project (MK-III project) was started to improve the irradiation capability of the experimental fast reactor JOYO. In this project, core replacement and increase of the reactor thermal power by the factor 1.4 were necessary for increasing the maximum fast neutron flux by the factor 1.3 and doubling the capacity for irradiation rigs. The modification of the cooling system that included the replacement of the main intermediate heat exchangers and the dump heat exchangers was completed in September 2000. After a series of system function tests, the performance test, of which objective is to fully characterize the upgraded core and heat transfer system, was started in June 2003. Twenty eight tests were selected and carried out as performance test, in order to confirm that the whole plant satisfy the design criteria and have sufficient characteristics (data necessary for safe and steady operation, core management, reactor control and monitoring) as an irradiation bed. After attaining the initial criticality of the core on 2nd July 2003, core characteristics (the excess reactivity, the isotherm temperature reactivity coefficient, the power reactivity coefficient and so on), plant characteristics (the plant heat balance, the adjustment of the temperature control system, the plant behavior at transient), shielding characteristics (dose rate distribution). As the result, it was confirmed that all the criteria regulated was satisfied and the core and plant have sufficient margins for full power operation, which was increased by the factor 1.4. Especially, nuclear analysis accuracy was verified by comparing the calculation with measured core characteristics of the initial core which consists of fifty five fresh fuel subassemblies. The operational data which is supposed to be useful for developing in-core anomaly detection system were also obtained. The operation manual and training simulator and design of next reactor development were revised based on the results

  11. Effects upon metabolic pathways and energy production by Sb(III and As(III/Sb(III-oxidase gene aioA in Agrobacterium tumefaciens GW4.

    Directory of Open Access Journals (Sweden)

    Jingxin Li

    Full Text Available Agrobacterium tumefaciens GW4 is a heterotrophic arsenite [As(III]/antimonite [Sb(III]-oxidizing strain. The As(III oxidase AioAB is responsible for As(III oxidation in the periplasm and it is also involved in Sb(III oxidation in Agrobacterium tumefaciens 5A. In addition, Sb(III oxidase AnoA and cellular H2O2 are also responsible for Sb(III oxidation in strain GW4. However, the deletion of aioA increased the Sb(III oxidation efficiency in strain GW4. In the present study, we found that the cell mobility to Sb(III, ATP and NADH contents and heat release were also increased by Sb(III and more significantly in the aioA mutant. Proteomics and transcriptional analyses showed that proteins/genes involved in Sb(III oxidation and resistance, stress responses, carbon metabolism, cell mobility, phosphonate and phosphinate metabolism, and amino acid and nucleotide metabolism were induced by Sb(III and were more significantly induced in the aioA mutant. The results suggested that Sb(III oxidation may produce energy. In addition, without periplasmic AioAB, more Sb(III would enter bacterial cells, however, the cytoplasmic AnoA and the oxidative stress response proteins were significantly up-regulated, which may contribute to the increased Sb(III oxidation efficiency. Moreover, the carbon metabolism was also activated to generate more energy against Sb(III stress. The generated energy may be used in Sb transportation, DNA repair, amino acid synthesis, and cell mobility, and may be released in the form of heat.

  12. Mixed ligand complexes of some of the rare earths. La(III)-, Pr(III)- or Nd-(III)-CDTA-Hydroxy Acids

    Energy Technology Data Exchange (ETDEWEB)

    Rana, H S; Tandon, J P [Rajasthan Univ., Jaipur (India). Chemical Labs.

    1975-11-01

    Biligand complexes of the 1:1 Ln(III)-1,2-diaminocyclohexane-tetraacetic acid (CDTA) chelate with hydroxy acids (where hydroxy acids = salicylic acid (SA); Sulphosalicylic acid (SSA) and 8-hydroxyquinoline-5-sulphonic acid (HQSA)) have been investigated by potentiometric titration. Their formation constants have been calculated (..mu..=0.1M-KNO/sub 3/; and t=30+-1 deg C) as 4.60 +-0.03, 5.46+-0.03, 5.87+-0.05; 3.12+-0.04, 3.95+-0.05, 4.42+-0.07; 2.73+-0.06, 3.45+-0.05 and 3.90+-0.08 for Ln(III)-CDTA-SA,-SSA, and -HQSA respectively (where Ln=La, Pr or Nd). The value of log Ksub(MAB) follows the order: La(III)).

  13. Influence of the diluents on the extraction behaviour of Eu(III), and tm (III) by thenoytrifluoro acetone and/or 18-crown-6 or 15-crown-5 from nitrate aqueous medium. Vol. 3

    Energy Technology Data Exchange (ETDEWEB)

    Shehata, F A; El-Hefny, N; Aly, H F [Hot Laboratories Center, Atomic Energy Authority, Cairo (Egypt)

    1996-03-01

    The effects of different diluents on the synergistic extraction of Eu(III), and Tm (III) by thenoyltrifluoroacetone (HTTA) and/or 18-crown-5 was investigated from nitrate aqueous medium. For these systems, it is found that the diluent affects the extracted species in the organic phase. The composition of the extracted species have been proposed on the basis of slope analysis method. With HTTA alone, the stoichiometry of the extracted species was found to be M(TTA){sub 3} or M(NO{sub 3}) (TTA){sub 2} (HTTA) where M=Eu(III) or Tm(III). With HTA-Crown mixture the extracted species were M(TTA){sub 3}. CE or M(NO{sub 3}) (TTA){sub 2}. CE. The respective extraction and formation constants were evaluated. Different thermodynamic parameters of Eu (III), and Tm (III) extraction were determined from the experimental results. The variations obtained in the distribution was explained in terms of the interaction between the solute and the diluents. Correlations between the extraction and formation constants of the extracted species of Eu and Tm and the physicochemical parameter of the diluents used are given and discussed. 3 figs.,1 tab.

  14. Aspectos sociopsicológicos del climaterio y la menopausia

    Directory of Open Access Journals (Sweden)

    Dayana Couto Núñez

    2014-10-01

    Full Text Available El climaterio y la menopausia adquieren mayor trascendencia con el transcurso del tiempo. Al respecto, el concepto de calidad de vida se ha ido convirtiendo en un aspecto importante cuando la mujer climatérica se presenta ante el especialista, en busca de un mayor bienestar posible. En la edad mediana, el organismo se torna más frágil como consecuencia de las variaciones fisiológicas naturales del climaterio y la repercusión del contexto social sobre la persona, cuya sobrecarga física y mental favorece la aparición de procesos que deterioran la salud femenina y hacen más crítico el cuadro sintomático en este período, todo lo cual puede agravarse si existen un trastorno psicogénico previo y algunos elementos desfavorables del medio circundante

  15. Aspectos claves-tiempo dependientes que amenazan la vida en el prehospitalario

    Directory of Open Access Journals (Sweden)

    Patricio A. Cortés P., Dr.

    2011-09-01

    En esta misma perspectiva, la resolución de oportunidad y calidad se logra apuntando hacia los aspectos claves-tiempo dependientes que amenazan la vida del paciente, siendo estos clínicos (parocardiorespiratorio, compromiso de la vía aérea y la ventilación, compromiso de la perfusión tisular y el enfrentamiento al dolor torácico con su expresión máxima que es el síndrome coronario agudo, como también organizacionales (entre algunos la presencia de médicos en el Prehospitalario (Ph o el uso de determinados recursos sensibles como el traslado heliportado.

  16. Enhancement of the fluorescence of the samarium (III) complex by gadolinium (III)

    International Nuclear Information System (INIS)

    Yun-Xiang, C.; Zhang-Hua, L.

    1988-01-01

    The increase in sensitivity and selectivity of reactions in which colored species are formed by the addition of different metal ions is an area of research that has recently been developed. This phenomenon, which is sometimes called cocolaration effect, has been explained by the formation of mixed metal complex. The authors found an analogous phenomenon of reactions forming fluorescent complexes. The complexes of Sm(III)-thenoyltrifluoroacetone (TTA)-phenanthroline (Phen)-Triton-X-100 (TX-100) and Gd(III) (or La(III), Lu(III) and Y(III))-TTA-Phen-TX-100 had practically no fluorescence separately. Instead, a fluorescence-enhancement phenomenon caused by adding Gd or La, Lu and Y ions to the system was observed for the first time. The intensity of the enhanced fluorescence of Sm(III) complex was increased in the following order: La< Y< Lu< Gd. By analogy with cocoloration effect, the authors call this new fluorescence-enhancement phenomenon the co-fluorescence effect. The object of this work was to study the enhancement effect of Gd(III) on the fluorescence of the Sm(III)-TTA-Phen-TX-100 system. The recommended fluorimetric method has been applied to the determination of trace amounts of samarium in ytterbium oxide with satisfactory results. A general reaction mechanism for the system studied was proposed

  17. Presencia, tendencias y aspectos diferenciadores de la formación sobre derechos de autor en la alfabetización informacional a nivel universitario

    OpenAIRE

    Uribe Tirado, Alejandro

    2010-01-01

    Objetivo. Analizar la presencia de la temática de los derechos de autor, de los aspectos legales de la información académica y científica, en distintos programas, cursos o programas de aprendizaje de alfabetización informacional (ALFIN) de diferentes universidades alrededor del mundo, para identificar las tendencias y aspectos diferenciadores que se están presentando en la actualidad respecto a la formación en estas temáticas en relación con la información digital. También se a...

  18. Inactivation of Laccase by the Attack of As (III) Reaction in Water.

    Science.gov (United States)

    Hu, Jinyuan; Lu, Kun; Dong, Shipeng; Huang, Qingguo; Mao, Liang

    2018-03-06

    Laccase is a multicopper oxidase containing four coppers as reaction sites, including one type 1, one type 2, and two type 3. We here provide the first experimental data showing that As (III) can be effectively removed from water and transformed to As (V) through reactions mediated by laccase with the presence of oxygen. To this end, the As (III) removal, As (V) yields, total protein, active laccase, and copper concentrations in the aqueous phase were determined, respectively. Additionally, electron paramagnetic resonance spectra and UV-vis spectra were applied to probe possible structural changes of the laccase during the reaction. The data offer the first evidence that laccase can be inactivated by As (III) attack thus leading to the release of type 2 copper. The released copper has no reactivity with the As (III). These findings provide new ideas into a significant pathway likely to master the environmental transformation of arsenite, and advance the understanding of laccase inactivation mechanisms, thus providing a foundation for optimization of enzyme-based processes and potential development for removal and remediation of arsenite contamination in the environment.

  19. Los Derechos de admisión y permanencia en los partidos políticos : aspectos constitucionales

    OpenAIRE

    Escobar Roca, Guillermo

    1993-01-01

    En este trabajo se estudia un doble aspecto del Derecho de partidos (la admisión y permanencia en los mismos), seguramente no central, pero cuyo correcto tratarniento jurídico puede coadyuvar a la ruptura de la impermeabilidad característica de estas organizaciones, formalmente privadas pero que desempeñan funciones públicas.

  20. Aspectos Farmacológicos y Socioculturales del consumo de hoja de coca en indígenas Koguis respecto al consumo de cocaína en ambientes urbanos

    Directory of Open Access Journals (Sweden)

    Katiuska Vera Zambrano

    2002-07-01

    Full Text Available La investigación compara los aspectos farmacológicos y socioculturales del consumo de la hoja de coca en indígenas Kogui de la Sierra Nevadade Santa Marta en Colombia frente a los aspectos farmacológicos y socioculturales del  consumo de cocaína en los ambientes urbanos, relacionados con los conceptos de tolerancia y dependencia a sustancias psicoactivas. Los resultados aportan al desarrollo  y diseño de programas de prevención, tratamiento y reducción de riesgo y daño en fármaco dependencia, al igual que sugiere la inclusión de aspectos relevantes en futuras políticas sociales de prevención en drogas.

  1. Metallothionein (MT)-III

    DEFF Research Database (Denmark)

    Carrasco, J; Giralt, M; Molinero, A

    1999-01-01

    Metallothionein-III is a low molecular weight, heavy-metal binding protein expressed mainly in the central nervous system. First identified as a growth inhibitory factor (GIF) of rat cortical neurons in vitro, it has subsequently been shown to be a member of the metallothionein (MT) gene family...... injected rats. The specificity of the antibody was also demonstrated in immunocytochemical studies by the elimination of the immunostaining by preincubation of the antibody with brain (but not liver) extracts, and by the results obtained in MT-III null mice. The antibody was used to characterize...... the putative differences between the rat brain MT isoforms, namely MT-I+II and MT-III, in the freeze lesion model of brain damage, and for developing an ELISA for MT-III suitable for brain samples. In the normal rat brain, MT-III was mostly present primarily in astrocytes. However, lectin staining indicated...

  2. Aspectos ultra-sonográficos da trombose da veia porta Ultrasonographic features of portal vein thrombosis

    Directory of Open Access Journals (Sweden)

    Márcio Martins Machado

    2006-04-01

    Full Text Available A trombose da veia porta pode estar associada a várias alterações, como a presença de tumores (por exemplo: hepatocarcinoma, doença metastática hepática e carcinoma do pâncreas, pancreatite, hepatite, septicemia, trauma, esplenectomia, derivações porto-cava, estados de hipercoagulabilidade (por exemplo: gravidez, em neonatos (por exemplo: onfalite e cateterização da veia umbilical e desidratação aguda. Os autores discutem, neste artigo, os aspectos ultra-sonográficos da trombose de veia porta e alguns aspectos de relevância clínica.Portal vein thrombosis may be associated with many alterations, such as the presence of tumors (for example, hepatocellular carcinoma, metastatic liver disease and carcinoma of the pancreas as well as pancreatitis, hepatitis, septicemia, trauma, splenectomy, portacaval shunts, hypercoagulable conditions (for example, pregnancy, in neonates (for example, omphalitis and umbilical vein catheterization and in acute dehydration. The authors discuss herein the sonographic features of portal vein thrombosis as well as some aspects of clinical relevance.

  3. Importância da microcirurgia experimental para transplantes de órgãos The importance of experimental microsurgery for transplantation

    Directory of Open Access Journals (Sweden)

    Paulo Ney Aguiar Martins

    2003-01-01

    Full Text Available A microcirurgia experimental é uma área relativamente nova e seu desenvolvimento foi um marco importante para o desenvolvimento da pesquisa imunológica e de técnicas cirúrgicas de transplante, pois permitiu a utilização de modelos animais de pequeno porte; mais apropriados para pesquisa, e com menor custo. A microcirurgia exige bastante habilidade técnica e treinamento continuo. Além disso contribui para formação do cirurgião de transplantes na medida que promove o desenvolvimento de habilidade manual, interesse científico e cooperação interdisciplinar. Esse artigo relata alguns aspectos históricos, a importância e as vantagens e limitações da microcirurgia experimental.Microsurgery was an hallmark for the transplantation immunological research and development of surgical techniques because it allowed the use of rodent models, which are more appropriate for research and more cost-effective. Microsurgery demands high technical skills and continuous training, and helps transplantation surgeons; since it promotes the development of surgical skills, scientific interest and interdisciplinary cooperation. This article reviews some aspects of the history, advantages and limitations of experimental microsurgery and its importance for the development of transplantation surgery.

  4. Effect of ionizing radiation on the activity of restriction nucleases PvuII and HindIII

    International Nuclear Information System (INIS)

    Luzova, M.; Michaelidesova, A.; Davidkova, M.

    2014-01-01

    The research is focused on the influence of the ionizing radiation on the activity of the restriction enzymes PvuII and HindIII. Enzymes PvuII and HindIII are restriction endonucleases of type II. These enzymes can be found in bacteria and they have a significant role in defense mechanisms of bacteria against viruses. They cleave DNA double helix at specific recognition palindromic sequences in the presence of cofactor Mg 2+ . PvuII cleaves the sequence CAG↓CTG and HindIII cleaves the sequence A↓AGCTT in marked places. Plasmid pcDNA3 has been used as the DNA substrate for the whole experimental study. It is 5446 base pairs (bp) long, circular DNA molecule and it contains three recognition sites for enzyme PvuII and one recognition site for enzyme HindIII. After the correct interaction of pcDNA3 with PvuII, we thus have three plasmid fragments with lengths 1069, 1097 and 3280 bp. When HindIII is incubated with this plasmid, we shall obtain the linear form of the DNA plasmid.The method for processing the cleaved DNA samples is the agarose gel electrophoresis. The activity of the irradiated enzymes decreases with increasing dose of radiation, because a part of the enzymes is deactivated due to induced radiation damage. To determine effect of radiation quality, samples were irradiated using proton and gamma sources. The results of our experimental study will be presented and discussed with respect to molecular structure of both enzymes and particular sites of radical damage influencing their function. (authors)

  5. Elasto-dynamic analysis of a gear pump-Part III: Experimental validation procedure and model extension to helical gears

    Science.gov (United States)

    Mucchi, E.; Dalpiaz, G.

    2015-01-01

    This work concerns external gear pumps for automotive applications, which operate at high speed and low pressure. In previous works of the authors (Part I and II, [1,2]), a non-linear lumped-parameter kineto-elastodynamic model for the prediction of the dynamic behaviour of external gear pumps was presented. It takes into account the most important phenomena involved in the operation of this kind of machine. The two main sources of noise and vibration are considered: pressure pulsation and gear meshing. The model has been used in order to foresee the influence of working conditions and design modifications on vibration generation. The model's experimental validation is a difficult task. Thus, Part III proposes a novel methodology for the validation carried out by the comparison of simulations and experimental results concerning forces and moments: it deals with the external and inertial components acting on the gears, estimated by the model, and the reactions and inertial components on the pump casing and the test plate, obtained by measurements. The validation is carried out comparing the level of the time synchronous average in the time domain and the waterfall maps in the frequency domain, with particular attention to identify system resonances. The validation results are satisfactory globally, but discrepancies are still present. Moreover, the assessed model has been properly modified for the application to a new virtual pump prototype with helical gears in order to foresee gear accelerations and dynamic forces. Part IV is focused on improvements in the modelling and analysis of the phenomena bound to the pressure evolution around the gears in order to achieve results closer to the measured values. As a matter of fact, the simulation results have shown that a variable meshing stiffness has a notable contribution on the dynamic behaviour of the pump but this is not as important as the pressure phenomena. As a consequence, the original model was modified with the

  6. Sorption behavior of europium(III) and curium(III) on the cell surfaces of microorganisms

    International Nuclear Information System (INIS)

    Ozaki, T.; Kimura, T.; Ohnuki, T.; Yoshida, Z.; Gillow, J.B.; Francis, A.J.

    2004-01-01

    We investigated the association of europium(III) and curium(III) with the microorganisms Chlorella vulgaris, Bacillus subtilis, Pseudomonas fluorescens, Halomonas sp., Halobacterium salinarum, and Halobacterium halobium. We determined the kinetics and distribution coefficients (K d ) for Eu(III) and Cm(III) sorption at pH 3-5 by batch experiments, and evaluated the number of water molecules in the inner-sphere (N H 2 O ) and the degree of strength of ligand field (R E/M ) for Eu(III) by time-resolved laser-induced fluorescence spectroscopy (TRLFS). Exudates from C. vulgaris, Halomonas sp., and H. halobium had an affinity for Eu(III) and Cm(III). The log K d of Eu(III) and Cm(III) showed that their sorption was not fully due to the exchange with three protons on the functional groups on cell surfaces. The halophilic microorganisms (Halomonas sp., Halobacterium salinarum, H. halobium) showed almost no pH dependence in log K d , indicating that an exchange with Na + on the functional groups was involved in their sorption. The ΔN H 2 O (= 9 - N H 2 O ) for Eu(III) on C. vulgaris was 1-3, while that for the other microorganisms was over 3, demonstrating that the coordination of Eu(III) with C. vulgaris was predominantly an outer-spherical process. The R E/M for Eu(III) on halophilic microorganisms was 2.5-5, while that for non-halophilic ones was 1-2.5. This finding suggests that the coordination environment of Eu(III) on the halophilic microorganisms is more complicated than that on the other three non-halophilic ones. (orig.)

  7. Sorption behavior of europium(III) and curium(III) on the cell surfaces of microorganisms

    Energy Technology Data Exchange (ETDEWEB)

    Ozaki, T.; Kimura, T.; Ohnuki, T.; Yoshida, Z. [Advanced Science Research Center, Japan Atomic Energy Research Inst., Ibaraki (Japan); Gillow, J.B.; Francis, A.J. [Environmental Sciences Dept., Brookhaven National Lab., Upton, NY (United States)

    2004-07-01

    We investigated the association of europium(III) and curium(III) with the microorganisms Chlorella vulgaris, Bacillus subtilis, Pseudomonas fluorescens, Halomonas sp., Halobacterium salinarum, and Halobacterium halobium. We determined the kinetics and distribution coefficients (K{sub d}) for Eu(III) and Cm(III) sorption at pH 3-5 by batch experiments, and evaluated the number of water molecules in the inner-sphere (N{sub H{sub 2}O}) and the degree of strength of ligand field (R{sub E/M}) for Eu(III) by time-resolved laser-induced fluorescence spectroscopy (TRLFS). Exudates from C. vulgaris, Halomonas sp., and H. halobium had an affinity for Eu(III) and Cm(III). The log K{sub d} of Eu(III) and Cm(III) showed that their sorption was not fully due to the exchange with three protons on the functional groups on cell surfaces. The halophilic microorganisms (Halomonas sp., Halobacterium salinarum, H. halobium) showed almost no pH dependence in log K{sub d}, indicating that an exchange with Na{sup +} on the functional groups was involved in their sorption. The {delta}N{sub H{sub 2}O} (= 9 - N{sub H{sub 2}O}) for Eu(III) on C. vulgaris was 1-3, while that for the other microorganisms was over 3, demonstrating that the coordination of Eu(III) with C. vulgaris was predominantly an outer-spherical process. The R{sub E/M} for Eu(III) on halophilic microorganisms was 2.5-5, while that for non-halophilic ones was 1-2.5. This finding suggests that the coordination environment of Eu(III) on the halophilic microorganisms is more complicated than that on the other three non-halophilic ones. (orig.)

  8. Experimental transition probabilities for several spectral lines arising from the 5d10 6s{8s, 7p, 5f, 5g} electronic configurations of Pb III

    International Nuclear Information System (INIS)

    Alonso-Medina, A.

    2010-01-01

    Transition probabilities for 30 spectral lines, arising from the 5d 10 6s{8s, 7p, 5f, 5g} electronic configurations of Pb III (20 measured for the first time), have been experimentally determined from measurements of emission line intensities in a plasma lead induced by ablation with a Nd:YAG laser. The line intensities were obtained with the target placed in molecular argon at 6 Torr, recorded at a 400 ns delay from the laser pulse, which provides appropriate measurement conditions, and analysed between 200 and 700 nm. They are measured when the plasma reaches local thermodynamic equilibrium (LTE). The plasma under study had an electron temperature (T) of 21,400 K and an electron number density (N e ) of 7x10 16 cm -3 . The influence of self-absorption has been estimated for every line, and plasma homogeneity has been checked. The values obtained were compared with previous experimental values and theoretical estimates where possible.

  9. Removal of Chromium (III from Water by Using Modified and Nonmodified Carbon Nanotubes

    Directory of Open Access Journals (Sweden)

    Muataz Ali Atieh

    2010-01-01

    Full Text Available This study was carried out to evaluate the environmental application of modified and nonmodified carbon nanotubes through the experiment removal of chromium trivalent (III from water. The aim was to find the optimal condition of the chromium (III removal from water under different treatment conditions of pH, adsorbent dosage, contact time and agitation speed. Multi wall carbon nanotubes (MW-CNTs were characterized by field emission scanning electron microscopy (FE-SEM and transmission electron microscopy (TEM. The diameter of the carbon nanotubes produced varied from 20–40 nm with average diameter of 24 nm and 10 micrometer in length. Adsorption isotherms were used to model the adsorption behavior and to calculate the adsorption capacity of the absorbents. The results showed that, 18% of chromium (III removal was achieved using modified carbon nanotubes (M-CNTs at pH 7, 150 rpm, and 2 hours for a dosage of 150 mg of CNTs. The removal of Cr (III is mainly attributed to the affinity of chromium (III to the physical and chemical properties of the CNTs. The adsorption isotherms plots were well fitted with experimental data.

  10. Aspectos discursivos em As Bruxas de Salem: peça e filme

    OpenAIRE

    Pinheiro, Eder Sergio

    2009-01-01

    Esta pesquisa, cujo título é Aspectos Discursivos em As Bruxas de Salem: eça e Filme, propõe discutir a transposição da linguagem escrita, neste caso, as rubricas da peça de teatro para a linguagem fílmica, devido a problemática das duas linguagens se diferenciarem, convergirem-se e cruzarem-se ao mesmo tempo. Deste modo, dois fragmentos foram escolhidos para análise, sendo eles: um trecho da peça escrita As Bruxas de Salem (1953) e outro do filme (1976), ambos os trechos são correspondent...

  11. CLIMATERIO Y POSTMENOPAUSIA: ASPECTOS EDUCATIVOS A CONSIDERAR SEGUN LA ETAPA DEL PERIODO

    OpenAIRE

    ARAYA GUTIERREZ,ALEJANDRA; URRUTIA SOTO,MARIA TERESA; CABIESES VALDES,BALTICA

    2006-01-01

    El periodo del climaterio es una etapa de transición en la vida de la mujer caracterizada por cambios físicos, psicológicos y sociales. Es una etapa dinámica marcada por la repercusión de los cambios hormonales, principalmente por la paulatina disminución de los estrógenos. La presente revisión bibliográfica describe las características generales del periodo, cambios que ocurren y aspectos a educar en las mujeres durante el climaterio y la postmenopausia, con el propósito de dar una visión ac...

  12. Estudo dos aspectos éticos dos transplantes na América Latina

    OpenAIRE

    Virgínia Maria Coelho de Holanda; Francélia Loureiro Nery; Marta Barrozo Azevedo; Tânia Cristina Botelho Mendes

    1994-01-01

    Respeitando recomendações da OMS, foi feito estudo retrospectivo comparativo das Legislações de 16 Países da América Latina, a saber Argentina, Bolívia, Brasil, Colômbia, Costa Rica, Chile, Cuba, Equador, Guatemala, Honduras, México, Panamá, Paraguai, Peru, República Dominicana e Venezuela, do período de 1963 a 1992, enfatizando-se os aspectos éticos referentes a doação, determinação da morte, conflito de interesses, seleção do receptor, comercialização e intercâmbio internacional de órgãos. ...

  13. Experimental fast reactor JOYO MK-III functional test. Primary auxiliary cooling system test

    International Nuclear Information System (INIS)

    Karube, Koji; Akagi, Shinji; Terano, Toshihiro; Onuki, Osamu; Ito, Hideaki; Aoki, Hiroshi; Odo, Toshihiro

    2004-03-01

    This paper describes the results of primary auxiliary cooling system, which were done as a part of JOYO MK-III function test. The aim of the tests was to confirm the operational performance of primary auxiliary EMP and the protection system including siphon breaker of primary auxiliary cooling system. The items of the tests were: (Test No.): (Test item). 1) SKS-117: EMP start up test. 2) SKS-118-1: EMP start up test when pony motor running. 3) SKS-121: Function test of siphon breaker. The results of the tests satisfied the required performance, and demonstrated successful operation of primary auxiliary cooling system. (author)

  14. Transuranium perrhenates: Np(IV), Pu(IV) and (III), Am (III)

    International Nuclear Information System (INIS)

    Silvestre, Jean-Paul; Freundlich, William; Pages, Monique

    1977-01-01

    Synthesis in aqueous solution and by solid state reactions, crystallographical characterization and study of the stability of some transuranium perrhenates: Asup(n+)(ReO 4 - )sub(n) (A=Np(IV), Pu(IV), Pu(III), Am(III) [fr

  15. Sequential separation of copper(II), silver(I) and gold(III) (Paper No. RA-10)

    International Nuclear Information System (INIS)

    Amlani, A.M.; Turel, Z.R.

    1990-02-01

    A sequential separation procedure for the separation of Cu(II), Ag(I) and Au(III) employing solvent extraction technique of these three elements with 1, 2, 3-benzotriazole into chloroform under different experimental conditions has been developed. (author). 1 tab

  16. Relacionamentos de Marketing em Empresas Varejistas: Aspectos Positivos e Negativos

    Directory of Open Access Journals (Sweden)

    Cléria Donizete da Silva Lourenço

    2013-09-01

    Full Text Available O objetivo deste trabalho é compreender as relações de trocas comerciais sob a ótica dos clientes, funcionários e proprietários de empresas varejistas. A pesquisa, de natureza qualitativa, foi feita utilizando-se como método a etnografia. Os dados foram coletados em cinco empresas varejistas de um município de pequeno porte no Sul de Minas Gerais – um supermercado, uma farmácia, uma panificadora, um posto de combustíveis e uma loja de hortifrutigranjeiros – durante o período de um ano (dez/2008 a dez/2009. A observação participante e a entrevista em profundidade foram utilizadas como técnicas de coleta de dados. Para tratamento dos mesmos, utilizou-se a análise de conteúdo. Por meio da análise empreendida, identificou-se que os relacionamentos de marketing são compostos tanto por aspectos positivos quanto negativos. Contudo, os aspectos positivos são predominantes, especialmente pelo fato de que o cultivo de relacionamentos nas empresas varejistas analisadas é uma ocorrência natural, podendo, portanto, ser caracterizado como “genuíno”. Em termos teóricos, uma das principais descobertas feitas nesta pesquisa é que o relacionamento de marketing pode trazer também implicações negativas para as empresas confirmando as descobertas de Grayson and Ambler (1999 quando eles afirmam que o marketing de relacionamento pode trazer benefícios, mas também desvantagens inerentes. Em termos gerenciais, há que se ressaltar o papel fundamental que os funcionários exercem na construção de relacionamentos duradouros. Sendo assim, maior atenção deveria ser dispensada ao desenvolvimento de habilidades de relacionamentos daqueles que estão face a face com o cliente. DOI: 10.5585/remark.v12i3.2513

  17. Mathematical models applied to the Cr(III) and Cr(VI) breakthrough curves.

    Science.gov (United States)

    Ramirez C, Margarita; Pereira da Silva, Mônica; Ferreira L, Selma G; Vasco E, Oscar

    2007-07-19

    Trivalent and hexavalent chromium continuous biosorption was studied using residual brewer Saccharomyces cerevisiae immobilized in volcanic rock. The columns used in the process had a diameter of 4.5 cm and a length of 140 cm, working at an inlet flow rate of 15 mL/min. Breakthrough curves were used to study the yeast biosorption behavior in the process. The saturation time (ts) was 21 and 45 h for Cr(III) and Cr(VI), respectively, and a breakthrough time (tb) of 4 h for Cr(III) and 5 h for Cr(VI). The uptake capacity of the biosorbent for Cr(III) and Cr(VI) were 48 and 60 mg/g, respectively. Two non-diffusional mathematical models with parameters t0 and sigma were used to adjust the experimental data obtained. Microsoft Excel tools were used for the mathematical solution of the two parameters used.

  18. Magnetooptical investigations on ferromagnetic III-V-semiconductors; Magnetooptische Untersuchungen an ferromagnetischen III-V-Halbleitern

    Energy Technology Data Exchange (ETDEWEB)

    Winter, Andreas

    2009-07-23

    III-Mn-V-semiconductors the Fermi-level is located far below the edge of the valence band and therefore optical transitions between different valence band levels are possible (which is not the case for pure III-V-systems). These transitions exhibit large transition rates and dominate the observed effects. Because all Landau levels in the valence band are shifted in the same direction by the external magnetic field the energy-differences for the transitions mostly do not change with the external field. The large exchange induced splitting between quasi continua of Landau states with different spin orientation which is proportional to the magnetization separates the transition energies for left and right hand circularly polarized light and thereby generates the observed magnetooptical effects. By fitting the aforementioned kp-theory to the experimental data it has been possible to determine the absolute value of the exchange integral between localized electrons in the Mn-ions and the free holes. (orig.)

  19. El aspecto lúdico en la enseñanza del ELE

    Directory of Open Access Journals (Sweden)

    Varela, Patricia

    2010-10-01

    Full Text Available Jugar y aprender son dos acciones íntimamente relacionadas, de forma que su complementación da lugar a un ambiente ameno en clase haciendo que el alumno se sienta más cómodo y abierto al aprendizaje. El objetivo de este artículo es analizar la importancia de la motivación en el alumno y los medios con los que contamos los docentes para desarrollarla de la forma más amena posible. Tendremos en cuenta la importancia del aspecto lúdico en la enseñanza del español como lengua extranjera y a la vez poner en práctica diversas posibilidades de aplicación del mismo

  20. Feasibility analysis of As(III) removal in a continuous flow fixed bed system by modified calcined bauxite (MCB)

    International Nuclear Information System (INIS)

    Bhakat, P.B.; Gupta, A.K.; Ayoob, S.

    2007-01-01

    This study examine the feasibility of As(III) removal from aqueous environment by an adsorbent, modified calcined bauxite (MCB) in a continuous flow fixed bed system. MCB exhibited excellent adsorption capacity of 520.2 mg/L (0.39 mg/g) with an adsorption rate constant 0.7658 L/mg h for an influent As(III) concentration of 1 mg/L. In a 2 cm diameter continuous flow fixed MCB bed, a depth of only 1.765 cm was found necessary to produce effluent As(III) concentration of 0.01 mg/L, from an influent of 1 mg/L at a flow rate of 8 mL/min. Also, bed heights of 10, 20, and 30 cm could treat 427.85, 473.88 and 489.17 bed volumes of water, respectively, to breakthrough. A reduction in adsorption capacity of MCB was observed with increase in flow rates. The theoretical service times evaluated from bed depth service time (BDST) approach for different flow rates and influent As(III) concentrations had shown good correlation with the corresponding experimental values. The theoretical breakthrough curve developed from constantly mixed batch reactor (CMBR) isotherm data also correlated well with experimental breakthrough curve

  1. Miastenia grave: aspectos históricos Myasthenia gravis: historical aspects

    Directory of Open Access Journals (Sweden)

    FRANCISCO MARCOS B. CUNHA

    1999-06-01

    Full Text Available Foram pesquisados aspectos históricos da miastenia grave desde as primeiras descrições da doença em 1672, pelo clínico inglês Thomas Willis. São descritas as dificuldades encontradas no manuseio dos primeiros pacientes diagnosticados. Pesquisaram-se fatos históricos ligados à investigação da doença, o tratamento, bem como curiosidades pouco citadas na literatura.We studied historical aspects of myasthenia gravis starting from its first description by the English physician, Sir Thomas Willis, in 1672. We also describe the difficulties in managing triating the first diagnosed patient. Historical facts related to the investigation and the initial treatment of this disorder as well as curiosities seldom mentioned in the literature are part of this paper.

  2. Spectroscopic characterization of III-V semiconductor nanomaterials

    Science.gov (United States)

    Crankshaw, Shanna Marie

    III-V semiconductor materials form a broad basis for optoelectronic applications, including the broad basis of the telecom industry as well as smaller markets for high-mobility transistors. In a somewhat analogous manner as the traditional silicon logic industry has so heavily depended upon process manufacturing development, optoelectronics often relies instead on materials innovations. This thesis focuses particularly on III-V semiconductor nanomaterials, detailed characterization of which is invaluable for translating the exhibited behavior into useful applications. Specifically, the original research described in these thesis chapters is an investigation of semiconductors at a fundamental materials level, because the nanostructures in which they appear crystallize in quite atypical forms for the given semiconductors. Rather than restricting the experimental approaches to any one particular technique, many different types of optical spectroscopies are developed and applied where relevant to elucidate the connection between the crystalline structure and exhibited properties. In the first chapters, for example, a wurtzite crystalline form of the prototypical zincblende III-V binary semiconductor, GaAs, is explored through polarization-dependent Raman spectroscopy and temperature-dependent photoluminescence, as well as second-harmonic generation (SHG). The altered symmetry properties of the wurtzite crystalline structure are particularly evident in the Raman and SHG polarization dependences, all within a bulk material realm. A rather different but deeply elegant aspect of crystalline symmetry in GaAs is explored in a separate study on zincblende GaAs samples quantum-confined in one direction, i.e. quantum well structures, whose quantization direction corresponds to the (110) direction. The (110) orientation modifies the low-temperature electron spin relaxation mechanisms available compared to the usual (001) samples, leading to altered spin coherence times explored

  3. The sorption of inorganic arsenic on modified sepiolite: Effect of hydrated iron(III-oxide

    Directory of Open Access Journals (Sweden)

    Ilić Nikola I.

    2014-01-01

    Full Text Available The sorption of inorganic arsenic species, As(III and As(V, from water by sepiolite modified with hydrated iron(III oxide was investigated at 25 °C through batch studies. The influence of the initial pH value, the initial As concentrations, the contact time and types of water on the sorption capacity was investigated. Two types of water were used, deionized and groundwater. The maximal sorption capacity for As(III from deionized water was observed at initial and final pH value 7.0, while the bonding of As(V was observed to be almost pH independent for pH value in the range from 2.0 to 7.0, and the significant decrease in the sorption capacity was observed at pH values above 7.0. The sorption capacity at initial pH 7.0 was about 10 mg gˉ1 for As(III and 4.2 mg gˉ1 for As(V in deionized water. The capacity in groundwater was decreased by 40 % for As(III and by 20 % for As(V. The Langmuir model and pseudo-second order kinetic model revealed good agreement with the experimental results. The results show that Fe(III-modified sepiolite exhibits significant affinity for arsenic removal and it has a potential for the application in water purification processes. [Projekat Ministarstva nauke Republike Srbije, br. III 45019, III 43009 i TR 37010

  4. Roman wall-painting technical aspects | Aspectos técnicos de la pintura mural romana | Aspectos técnicos de la pintura mural romana

    Directory of Open Access Journals (Sweden)

    Lorenzo Abad Casal

    1982-12-01

    Full Text Available Se estudian diversos aspectos técnicos de la pintura mural romana: composición de los morteros, sistemas de unión entre las diversas capas, trazados previos, técnica pictórica y técnicas de conservación y restauración. Todo ello se plasma en una serie de gráficas que ilustran las técnicas romanas y su evolución a través de los siglos. | Etude des divers aspects techniques de la peinture murale romainne: composition des mortiers, systèmes d'union entre les différents couches, dessins préparatoires, technique de la peinture et procedés de conservation et de restauration. Un resumé sous forme graphique permet une vision synoptique de l'évolution des techniques de peinture romaine au cours des siècles.

  5. Dor neuropática central após lesão medular traumática: capacidade funcional e aspectos sociais Dolor neuropático central después de lesión medular traumática: capacidad funcional y aspectos sociales Central neuropathic pain after traumatic spinal cord injury: functional capacity and social aspects

    OpenAIRE

    Janaina Vall; Violante Augusta Batista Braga

    2005-01-01

    Estudo de caso comparativo com o objetivo de avaliar a capacidade funcional e os aspectos sociais de dois pacientes, ambos com lesão medular traumática, sem e com dor neuropática central associada, respectivamente. Para avaliar a capacidade funcional, foi utilizado como instrumento o Functional Independence Measure ou Escala de Independência Funcional. E para avaliar os aspectos sociais foi construído o ecomapa de cada paciente, preconizado pelo modelo Calgary de avaliação de famílias. Ambos ...

  6. BIOÉTICA Y DISCAPACIDAD PSIQUIÁTRICA: ASPECTOS CLÍNICOS Y JURÍDICOS BIOETICA E INCAPACIDADE PSIQUIÁTRICA: ASPECTOS CLÍNICOS E JURÍDICOS BIOETHICS AN PSYCHIATRIC DISSABILITY: CLINICAL AND JURIDICAL APECTS

    Directory of Open Access Journals (Sweden)

    Laura Rueda Castro

    2003-01-01

    Full Text Available La presente monografía busca establecer un nexo interdisciplinario entre la bioética y los aspectos clínicos y jurídicos que se conectan en la atención, protección y rehabilitación de las personas afectadas por enfermedades psiquiátricas. El análisis se centra en aquellas personas adultas, privadas de razón como consecuencia de un proceso psicopatológico, titulares de todos sus derechos civiles, pero que, por motivos de la enfermedad, se encuentran con dificultades para ejercerlosA presente monografia busca estabelecer nexo interdisciplinar entre bioética e aspectos clínicos e jurídicos na atenção, proteção e reabilitação de pessoas portadoras de enfermidades psiquiátricas. A análise é centrada em pacientes adultos privados de razão em decorrência de processo psicopatológico, titulares de todos direitos civis, mas que, em função da enfermidade, encontram-se em dificuldades para exercê-losThis monography seeks to establish an interdisciplinary link between bioethics and the clinical and juridical aspects that connect with attention, protection and rehabilitation of persons with psychiatric illness. The analysis is centered those adults, on deprived of reasoning because of a psycopathologic process, entitled to civil rights, but with dificulties to exercise them due to their illness

  7. ROSA-III 200% double-ended break integral test RUN 901

    International Nuclear Information System (INIS)

    Nakamura, Hideo; Tasaka, Kanji; Koizumi, Yasuo; Anoda, Yoshinari; Kumamaru, Hiroshige; Murata, Hideo; Suzuki, Mitsuhiro; Shiba, Masayoshi

    1984-02-01

    This report presents the experimental data of RUN 901, a 200% double-ended break test at the recirculation pump suction line with the ROSA-III test facility. The ROSA-III test facility is a volumetrically scaled (1/424) system of the BWR/6. The facility has the electrically heated core, the break simulator and the scaled ECCS (Emergency Core Cooling System). The MSIV closure and the ECCS actuation were tripped by the liquid level in the upper downcomer. The channel inlet flows were measured by differential pressure transducers installed at the channel inlet orifices of the fuel assembly No.4. The PCT (Peak Cladding Temperature) was 780 K occured during the blowdown phase in RUN 901. The whole core was quenched after the ECCS actuation and the effectiveness of ECCS has been confirmed. (author)

  8. Positional stability experiment and analysis of elongated plasmas in Doublet III

    International Nuclear Information System (INIS)

    Yokomizo, Hideaki

    1984-04-01

    Control systems of the plasma position and shape on Doublet III are explained and experimental results of vertical stability of elongated plasmas are reviewed. Observed results of the vertical instability are qualitatively compared with the predictions from the simplified model and quantitatively compared with the numerical calculations based on a more realistic model. Experiments are in reasonable agreement with the theoretical analyses. (author)

  9. PROTEUS Experimental data

    International Nuclear Information System (INIS)

    Perret, G.

    2013-01-01

    This presentation gives an overview of the PROTEUS experimental programme performed at PSI over more than 30 years. In the 1970's the Gas-Cooled Fast Reactor (GCFR) experiments were essentially designed to improve the nuclear data in the fast energy range. The light water reactor experiments performed in the 1980's (HCLWR) and until 2006 (LWR-PROTEUS, Phases I, II and III) allowed to study various configurations for PWR and BWR. More information is available on the PROTEUS web site at http://proteus.web.psi.ch

  10. Output commitment through product bundling : Experimental evidence

    NARCIS (Netherlands)

    Hinloopen, Jeroen; Mueller, Wieland; Normann, Hans-Theo

    We analyze the impact of product bundling in experimental markets. One firm has monopoly power in a first market but competes with another firm la Cournot in a second market. We compare treatments where the multi-product firm (i) always bundles, (ii) never bundles, and (iii) chooses whether to

  11. Gold(III) complexes with 2-substituted pyridines as experimental anticancer agents: solution behavior, reactions with model proteins, antiproliferative properties.

    Science.gov (United States)

    Maiore, Laura; Cinellu, Maria Agostina; Nobili, Stefania; Landini, Ida; Mini, Enrico; Gabbiani, Chiara; Messori, Luigi

    2012-03-01

    Gold(III) compounds form a family of promising cytotoxic and potentially anticancer agents that are currently undergoing intense preclinical investigations. Four recently synthesized and characterized gold(III) derivatives of 2-substituted pyridines are evaluated here for their biological and pharmacological behavior. These include two cationic adducts with 2-pyridinyl-oxazolines, [Au(pyox(R))Cl(2)][PF(6)], [pyox(R)=(S)-4-benzyl-2-(pyridin-2-yl)-4,5-dihydrooxazole, I; (S)-4-iso-propyl-2-(pyridin-2-yl)-4,5-dihydrooxazole, II] and two neutral complexes [Au(N,N'OH)Cl(2)], III, and [Au(N,N',O)Cl], IV, containing the deprotonated ligand N-(1-hydroxy-3-iso-propyl-2-yl)pyridine-2-carboxamide, N,N'H,OH, resulting from ring opening of bound pyox(R) ligand of complex II by hydroxide ions. The solution behavior of these compounds was analyzed. These behave as classical prodrugs: activation of the metal center typically takes place through release of the labile chloride ligands while the rest of the molecule is not altered; alternatively, activation may occur through gold(III) reduction. All compounds react eagerly with the model protein cyt c leading to extensive protein metalation. ESI MS experiments revealed details of gold-cyt c interactions and allowed us to establish the nature of protein bound metal containing fragments. The different behavior displayed by I and II compared to III and IV is highlighted. Remarkable cytotoxic properties, against the reference human ovarian carcinoma cell lines A2780/S and A2780/R were disclosed for all tested compounds with IC(50) values ranging from 1.43 to 6.18 μM in the sensitive cell line and from 1.59 to 10.86 μM in the resistant one. The common ability of these compounds to overcome cisplatin resistance is highlighted. The obtained results are thoroughly discussed in the frame of current knowledge on cytotoxic gold compounds. Copyright © 2011 Elsevier Inc. All rights reserved.

  12. The coupling of thermochemistry and phase diagrams for group III-V semiconductor systems. Final report

    Energy Technology Data Exchange (ETDEWEB)

    Anderson, T.J.

    1998-07-21

    The project was directed at linking the thermochemical properties of III-V compound semiconductors systems with the reported phase diagrams. The solid-liquid phase equilibrium problem was formulated and three approaches to calculating the reduced standard state chemical potential were identified and values were calculated. In addition, thermochemical values for critical properties were measured using solid state electrochemical techniques. These values, along with the standard state chemical potentials and other available thermochemical and phase diagram data, were combined with a critical assessment of selected III-V systems. This work was culminated with a comprehensive assessment of all the III-V binary systems. A novel aspect of the experimental part of this project was the demonstration of the use of a liquid encapsulate to measure component activities by a solid state emf technique in liquid III-V systems that exhibit high vapor pressures at the measurement temperature.

  13. On the structure and spin states of Fe(III)-EDDHA complexes.

    Science.gov (United States)

    Gómez-Gallego, Mar; Fernández, Israel; Pellico, Daniel; Gutiérrez, Angel; Sierra, Miguel A; Lucena, Juan J

    2006-07-10

    DFT methods are suitable for predicting both the geometries and spin states of EDDHA-Fe(III) complexes. Thus, extensive DFT computational studies have shown that the racemic-Fe(III) EDDHA complex is more stable than the meso isomer, regardless of the spin state of the central iron atom. A comparison of the energy values obtained for the complexes under study has also shown that high-spin (S = 5/2) complexes are more stable than low-spin (S = 1/2) ones. These computational results matched the experimental results of the magnetic susceptibility values of both isomers. In both cases, their behavior has been fitted as being due to isolated high-spin Fe(III) in a distorted octahedral environment. The study of the correlation diagram also confirms the high-spin iron in complex 2b. The geometry optimization of these complexes performed with the standard 3-21G* basis set for hydrogen, carbon, oxygen, and nitrogen and the Hay-Wadt small-core effective core potential (ECP) including a double-xi valence basis set for iron, followed by single-point energy refinement with the 6-31G* basis set, is suitable for predicting both the geometries and the spin-states of EDDHA-Fe(III) complexes. The presence of a high-spin iron in Fe(III)-EDDHA complexes could be the key to understanding their lack of reactivity in electron-transfer processes, either chemically or electrochemically induced, and their resistance to photodegradation.

  14. Solution chemistry of Mo(III) and Mo(IV): Thermodynamic foundation for modeling localized corrosion

    International Nuclear Information System (INIS)

    Wang Peiming; Wilson, Leslie L.; Wesolowski, David J.; Rosenqvist, Joergen; Anderko, Andrzej

    2010-01-01

    To investigate the behavior of molybdenum dissolution products in systems that approximate localized corrosion environments, solubility of Mo(III) in equilibrium with solid MoO 2 has been determined at 80 deg. C as a function of solution acidity, chloride concentration and partial pressure of hydrogen. The measurements indicate a strong increase in solubility with acidity and chloride concentration and a weak effect of hydrogen partial pressure. The obtained results have been combined with literature data for systems containing Mo(III), Mo(IV), and Mo(VI) in solutions to develop a comprehensive thermodynamic model of aqueous molybdenum chemistry. The model is based on a previously developed framework for simulating the properties of electrolyte systems ranging from infinite dilution to solid saturation or fused salt limit. To reproduce the measurements, the model assumes the presence of a chloride complex of Mo(III) (i.e., MoCl 2+ ) and hydrolyzed species (MoOH 2+ , Mo(OH) 2 + , and Mo(OH) 3 0 ) in addition to the Mo 3+ ion. The model generally reproduces the experimental data within experimental scattering and provides a tool for predicting the phase behavior and speciation in complex, concentrated aqueous solutions. Thus, it provides a foundation for simulating the behavior of molybdenum species in localized corrosion environments.

  15. Basel III D: Swiss Finish to Basel III

    OpenAIRE

    Christian M. McNamara; Natalia Tente; Andrew Metrick

    2014-01-01

    After the Basel Committee on Banking Supervision (BCBS) introduced the Basel III framework in 2010, individual countries confronted the question of how best to implement the framework given their unique circumstances. Switzerland, with a banking industry that is both heavily concentrated and very large relative to the size of its overall economy, faced a special challenge. It ultimately adopted what is sometimes referred to as the “Swiss Finish” to Basel III – enhanced requirements applicable...

  16. Experimental and Computational Evidence for the Mechanism of Intradiol Catechol Dioxygenation by Non- Heme Iron(III) Complexes

    NARCIS (Netherlands)

    Jastrzebski, Robin; Quesne, Matthew G.; Weckhuysen, Bert M.; de Visser, Sam P.; Bruijnincx, Pieter C. A.

    2014-01-01

    Catechol intradiol dioxygenation is a unique reaction catalyzed by iron-dependent enzymes and nonheme iron(III) complexes. The mechanism by which these systems activate dioxygen in this important metabolic process remains controversial. Using a combination of kinetic measurements and computational

  17. Cr(VI) retention and transport through Fe(III)-coated natural zeolite

    Energy Technology Data Exchange (ETDEWEB)

    Du, Gaoxiang [School of Materials Science and Technology, China University of Geosciences, Beijing 100083 (China); Li, Zhaohui, E-mail: li@uwp.edu [School of Materials Science and Technology, China University of Geosciences, Beijing 100083 (China); Geosciences Department, University of Wisconsin-Parkside, Kenosha, WI 53144 (United States); Department of Earth Sciences, National Cheng Kung University, 1 University Road, Tainan 70101, Taiwan (China); Liao, Libing [School of Materials Science and Technology, China University of Geosciences, Beijing 100083 (China); Hanson, Renee; Leick, Samantha; Hoeppner, Nicole [Geosciences Department, University of Wisconsin-Parkside, Kenosha, WI 53144 (United States); Jiang, Wei-Teh [Department of Earth Sciences, National Cheng Kung University, 1 University Road, Tainan 70101, Taiwan (China)

    2012-06-30

    Graphical abstract: Breakthrough curves of Cr(VI) from columns packed with raw zeolite (a) and Fe(III)-zeolite (b). The solid line in (b) is the HYDRUS-1D fit to the observed data with adsorption term only, while the dashed line in (b) includes a reduction term in the HYDRUS-1D fit. Highlights: Black-Right-Pointing-Pointer Zeolite modified with Fe(III) could be used for adsorption and retention of Cr(VI). Black-Right-Pointing-Pointer The Fe present on zeolite was in an amorphous Fe(OH){sub 3} form. Black-Right-Pointing-Pointer A Cr(VI) adsorption capacity of 82 mg/kg was found on Fe(III)-zeolite. Black-Right-Pointing-Pointer A Cr(VI) retardation factor of 3 or 5 was determined from column and batch studies. - Abstract: Cr(VI) is a group A chemical based on the weight of evidence of carcinogenicity. Its transport and retention in soils and groundwater have been studied extensively. Zeolite is a major component in deposits originated from volcanic ash and tuff after alteration. In this study, zeolite aggregates with the particle size of 1.4-2.4 mm were preloaded with Fe(III). The influence of present Fe(III) on Cr(VI) retention by and transport through zeolite was studied under batch and column experiments. The added Fe(III) resulted in an enhanced Cr(VI) retention by the zeolite with a capacity of 82 mg/kg. The Cr(VI) adsorption on Fe(III)-zeolite followed a pseudo-second order kinetically and the Freundlich adsorption isotherm thermodynamically. Fitting the column experimental data to HYDRUS-1D resulted in a retardation factor of 3 in comparison to 5 calculated from batch tests at an initial Cr(VI) concentration of 3 mg/L. The results from this study showed that enhanced adsorption and retention of Cr(VI) may happen in soils derived from volcanic ash and tuff that contains significant amounts of zeolite with extensive Fe(III) coating.

  18. The Aerodynamics of Heavy Vehicles III : Trucks, Buses and Trains

    CERN Document Server

    Orellano, Alexander

    2016-01-01

    This volume contains papers presented at the International conference “The Aerodynamics of Heavy Vehicles III: Trucks, Buses and Trains” held in Potsdam, Germany, September 12-17, 2010 by Engineering Conferences International (ECI). Leading scientists and engineers from industry, universities and research laboratories, including truck and high-speed train manufacturers and operators were brought together to discuss computer simulation and experimental techniques to be applied for the design of more efficient trucks, buses and high-speed trains in the future.   This conference was the third in the series after Monterey-Pacific Groove in 2002 and Lake Tahoe in 2007.  The presentations address different aspects of train aerodynamics (cross wind effects, underbody flow, tunnel aerodynamics and aeroacoustics, experimental techniques), truck aerodynamics (drag reduction, flow control, experimental and computational techniques) as well as computational fluid dynamics and bluff body, wake and jet flows.

  19. Depressão na infância e adolecência: aspectos sociais

    OpenAIRE

    Lúcia Helena Siqueira Barbosa

    1987-01-01

    Este trabalho contém três partes. Uma primeira intitulada Introdução. Uma segunda focalizada sob o título de Material Clínico :apresentação, comentários e considerações sobre a prática do Serviço Social e, uma terceira, Considerações Finais. A primeira tenta discutir dois pontos: - algumas considerações sobre o conceito de depressão na infância e adolescência: caracterização de quadros clínicos com aspectos depressivos nítidos, mais ou menos "puros" e de "reações depressivas", em que tais asp...

  20. Estudo dos aspectos éticos dos transplantes na América Latina

    Directory of Open Access Journals (Sweden)

    Virgínia Maria Coelho de Holanda

    1994-06-01

    Full Text Available Respeitando recomendações da OMS, foi feito estudo retrospectivo comparativo das Legislações de 16 Países da América Latina, a saber Argentina, Bolívia, Brasil, Colômbia, Costa Rica, Chile, Cuba, Equador, Guatemala, Honduras, México, Panamá, Paraguai, Peru, República Dominicana e Venezuela, do período de 1963 a 1992, enfatizando-se os aspectos éticos referentes a doação, determinação da morte, conflito de interesses, seleção do receptor, comercialização e intercâmbio internacional de órgãos.

  1. Structure and stability of hexa-aqua V(III) cations in vanadium redox flow battery electrolytes.

    Science.gov (United States)

    Vijayakumar, M; Li, Liyu; Nie, Zimin; Yang, Zhenguo; Hu, JianZhi

    2012-08-07

    The vanadium(III) cation structure in mixed acid based electrolyte solution from vanadium redox flow batteries is studied by (17)O and (35/37)Cl nuclear magnetic resonance (NMR) spectroscopy, electronic spectroscopy and density functional theory (DFT) based computational modelling. Both computational and experimental results reveal that the V(III) species can complex with counter anions (sulfate/chlorine) depending on the composition of its solvation sphere. By analyzing the powder precipitate it was found that the formation of sulfate complexed V(III) species is the crucial process in the precipitation reaction. The precipitation occurs through nucleation of neutral species formed through deprotonation and ion-pair formation process. However, the powder precipitate shows a multiphase nature which warrants multiple reaction pathways for precipitation reaction.

  2. Binary and ternary chelates of Sc(III), Y(III) and La(III) with ethylenediamine tetraacetic acid as primary ligand and substituted salicylic acids as secondary ligands

    Energy Technology Data Exchange (ETDEWEB)

    Pandey, A K; Chandra, M; Agarwala, B V; Dey, A K [Allahabad Univ. (India). Chemical Labs.

    1980-02-01

    Study of ternary complex formation of several tripositive metal ions viz. Sc(III), Y(III) and La(III) with ethylenediamine tetraacetic acid (EDTA) as a primary ligand and 5-chlorosalicylic acid (CSA) or 3,5-dibromosalicylic acid (DBSA) as secondary ligands by pH-metric titration technique is reported. The stability order of metal chelates with respect to ligands is observed to be DBSA>CSA and with respect to metal ions Sc(III)>Y(III)>La(III).

  3. Semiconducting III-V compounds

    CERN Document Server

    Hilsum, C; Henisch, Heinz R

    1961-01-01

    Semiconducting III-V Compounds deals with the properties of III-V compounds as a family of semiconducting crystals and relates these compounds to the monatomic semiconductors silicon and germanium. Emphasis is placed on physical processes that are peculiar to III-V compounds, particularly those that combine boron, aluminum, gallium, and indium with phosphorus, arsenic, and antimony (for example, indium antimonide, indium arsenide, gallium antimonide, and gallium arsenide).Comprised of eight chapters, this book begins with an assessment of the crystal structure and binding of III-V compounds, f

  4. Aproximación Neuropsicológica al Constructo de Empatía: Aspectos Cognitivos y Neuroanatómicos

    Directory of Open Access Journals (Sweden)

    Vanessa Arán Filippetti

    2012-01-01

    Full Text Available Los modelos integradores definen a la empatía como un constructo multidimensional que incluye aspectos afectivos (EA; empatía afectiva y aspectos cognitivos (EC; empatía cognitiva. El objetivo del presente trabajo es exponer el estado del arte de la asociación entre la empatía y las funciones ejecutivas (FE y tratar de proponer una integración de las ideas al respecto. Para esto, se adopta un marco conceptual y se revisan estudios que conciben a la EA y a la EC como aspectos complementarios pero diferenciados tanto desde el punto de vista funcional como neurobiológico; ambos componentes se activarían conjuntamente durante la interacción social, pero podrían actuar por separado tal como se evidencia, por ejemplo, en el daño cerebral y en la psicopatología. Desde una perspectiva multidimensional, la relación empatía-FE podría explicarse a partir de la relación ECfTeoría de la MenteFE, así como mediante un modelo que admita la influencia de procesos top-down - a través de funciones ejecutivas - en el proceso empático. Adoptar una visión multidimensional de la empatía no sólo es relevante desde el punto de vista funcional, sino que aporta evidencia significativa para el diagnóstico, la evaluación y la comprensión del déficit empático en la clínica neurológica y psiquiátrica.

  5. Nonlinear generation of the fundamental radiation of interplanetary type III radio bursts

    International Nuclear Information System (INIS)

    Chian, A.C.L.; Alves, M.V.

    1988-01-01

    A new generation mechanism of interplanetary type III radio bursts at the fundamental electron plasma frequency is discussed. It is shown that the electromagnetic oscillating two-stream instability, driven by two oppositely propagating Langmuir waves, can account for the experimental observations. In particular, the major difficulties encountered by the previously considered electromagnetic decay instability are removed. 19 references

  6. Development of a C3-symmetric benzohydroxamate tripod: Trimetallic complexation with Fe(III), Cr(III) and Al(III)

    Science.gov (United States)

    Baral, Minati; Gupta, Amit; Kanungo, B. K.

    2016-06-01

    The design, synthesis and physicochemical characterization of a C3-symmetry Benzene-1,3,5-tricarbonylhydroxamate tripod, noted here as BTHA, are described. The chelator was built from a benzene as an anchor, symmetrically extended by three hydroxamate as ligating moieties, each bearing O, O donor sites. A combination of absorption spectrophotometry, potentiometry and theoretical investigations are used to explore the complexation behavior of the ligand with some trivalent metal ions: Fe(III), Cr(III), and Al(III). Three protonation constants were calculated for the ligand in a pH range of 2-11 in a highly aqueous medium (9:1 H2O: DMSO). A high rigidity in the molecular structure restricts the formation of 1:1 (M/L) metal encapsulation but shows a high binding efficiency for a 3:1 metal ligand stoichiometry giving formation constant (in β unit) 28.73, 26.13 and 19.69 for [M3L]; Mdbnd Fe(III), Al(III) and Cr(III) respectively, and may be considered as an efficient Fe-carrier. The spectrophotometric study reveals of interesting electronic transitions occurred during the complexation. BTHA exhibits a peak at 238 nm in acidic pH and with the increase of pH, a new peak appeared at 270 nm. A substantial shifting in both of the peaks in presence of the metal ions implicates a s coordination between ligand and metal ions. Moreover, complexation of BTHA with iron shows three distinct colors, violet, reddish orange and yellow in different pH, enables the ligand to be considered for the use as colorimetric sensor.

  7. Novel solid phase extraction procedure for gold(III) on Dowex M 4195 prior to its flame atomic absorption spectrometric determination

    International Nuclear Information System (INIS)

    Tuzen, Mustafa; Saygi, Kadriye O.; Soylak, Mustafa

    2008-01-01

    A method for solid phase extraction (SPE) of gold(III) using Dowex M 4195 chelating resin has been developed. The optimum experimental conditions for the quantitative sorption of gold(III), pH, effect of flow rates, eluent types, sorption capacity and the effect of diverse ions on the sorption of gold(III) have been investigated. The chelating resin can be reused for more than 100 cycles of sorption-desorption without any significant change in sorption of gold(III) ions. The recovery values for gold(III) and detection limit (LOD) of gold were greater than 95% and 1.61 μg L -1 , respectively. The preconcentration factor was 31. The relative standard deviation of the method was -1 . The proposed method has been applied for the determination of gold(III) in some real samples including water, soil and sediment samples

  8. Modelo integral de productividad, aspectos importantes para su implementación

    Directory of Open Access Journals (Sweden)

    Jorge Eduardo Medina Fernández de Soto

    2010-08-01

    Full Text Available El Modelo Integral busca la optimización de la productividad, a partir de los objetivos estratégicos empresariales y el análisis y mejoramiento de la propuesta de valor para el cliente, identificando el nivel de operación óptimo y los recursos tangibles realmente necesarios. También identifica los procesos empresariales de creación de valor y es una guía hacia el desarrollo de la propuesta de valor. Además, analiza las inversiones necesarias para las nuevas propuestas de valor, buscando un crecimiento estratégico sostenible. El artículo explica en primer lugar los fundamentos y componentes del modelo y luego algunos aspectos importantes para su implementación.

  9. Modeling of the adsorptive removal of arsenic(III) using plant biomass: a bioremedial approach

    Science.gov (United States)

    Roy, Palas; Dey, Uttiya; Chattoraj, Soumya; Mukhopadhyay, Debasis; Mondal, Naba Kumar

    2017-06-01

    In the present work, the possibility of using a non-conventional finely ground (250 μm) Azadirachta indica (neem) bark powder [AiBP] has been tested as a low-cost biosorbent for the removal of arsenic(III) from water. The removal of As(III) was studied by performing a series of biosorption experiments (batch and column). The biosorption behavior of As(III) for batch and column operations were examined in the concentration ranges of 50-500 µg L-1 and 500.0-2000.0 µg L-1, respectively. Under optimized batch conditions, the AiBP could remove up to 89.96 % of As(III) in water system. The artificial neural network (ANN) model was developed from batch experimental data sets which provided reasonable predictive performance ( R 2 = 0.961; 0.954) of As(III) biosorption. In batch operation, the initial As(III) concentration had the most significant impact on the biosorption process. For column operation, central composite design (CCD) was applied to investigate the influence on the breakthrough time for optimization of As(III) biosorption process and evaluation of interacting effects of different operating variables. The optimized result of CCD revealed that the AiBP was an effective and economically feasible biosorbent with maximum breakthrough time of 653.9 min, when the independent variables were retained at 2.0 g AiBP dose, 2000.0 µg L-1 initial As(III) concentrations, and 3.0 mL min-1 flow rate, at maximum desirability value of 0.969.

  10. A comparative study of ion exchange properties of antimony (III) tungstoselenite with those of antimony (III) tungstate and antimony (III) selenite

    International Nuclear Information System (INIS)

    Janardanan, C.; Nair, S.M.K.

    1996-01-01

    A new inorganic ion exchanger, antimony (III) tungstoselenite, has been prepared and characterised. Its exchange capacity and distribution coefficients for various metal ions and the effects of temperature and electrolyte concentrations on ion exchange capacity have been compared with antimony (III) tungstate and antimony (III) selenite. Six binary separations using the exchanger have been carried out. (author). 7 refs., 1 tab

  11. Fluorimetric determination of samarium(III) and europium(III) in neodymium oxide by separation with a resin column

    Energy Technology Data Exchange (ETDEWEB)

    Shaorong Liu; Jian Meng (Beijing Research Institute of Chemical Engineering and Metallurgy (China)); Wenhua Liu (General Research Institute for Non-Ferrous Metals (China))

    1992-08-24

    When thenoyltrifluoroacetone-phenanthroline-Triton X-100 is used to determine samarium(III) and europium(III) fluorimetrically, only a limited amount of neodymium(III) can be tolerated. By using an on- line separation which can partially separate neodymium(III) from samarium(III), a practical and convenient method was developed to detect samarium(III) at concentrations >0.05% and europium(III) at concentrations >0.005% in neodymium oxide. (author). 7 refs.; 4 figs.; 3 tabs.

  12. Fluorimetric determination of samarium(III) and europium(III) in neodymium oxide by separation with a resin column

    International Nuclear Information System (INIS)

    Shaorong Liu; Jian Meng; Wenhua Liu

    1992-01-01

    When thenoyltrifluoroacetone-phenanthroline-Triton X-100 is used to determine samarium(III) and europium(III) fluorimetrically, only a limited amount of neodymium(III) can be tolerated. By using an on- line separation which can partially separate neodymium(III) from samarium(III), a practical and convenient method was developed to detect samarium(III) at concentrations >0.05% and europium(III) at concentrations >0.005% in neodymium oxide. (author). 7 refs.; 4 figs.; 3 tabs

  13. A consistent set of thermodynamic constants for americium (III) species with hydroxyl and carbonate

    International Nuclear Information System (INIS)

    Kerrisk, J.F.; Silva, R.J.

    1986-01-01

    A consistent set of thermodynamic constants for aqueous species, and compounds of Am(III) with hydroxyl and carbonate ligands has been developed. The procedure used to develop these constants involved establishing a value for one formation constant at a time in a sequential order, starting with the hydrolysis products and hydroxide solids, and then proceeding to carbonate species. The EQ3NR chemical-equilibrium model was used to test the constants developed. These constants are consistent with most of the experimental data that form their basis; however, considerable uncertainty still exists in some aspects of the Am(III) data

  14. La actitud crítica un aspecto fundamental en la educación

    Directory of Open Access Journals (Sweden)

    Eduard Mauricio Wong Jaramillo

    2016-03-01

    Full Text Available En este artículo se reflexiona sobre el papel de la actitud crítica en la educación, dado que la capacidad de pensar por sí mismo y decidir de acuerdo con criterios racionales son aspectos decisivos que todo estudiante debe desarrollar, con el fin de propiciar sujetos que evalúen el saber. Otra razón que la hace necesaria es que la enseñanza pretende incentivar la formación de personas autónomas, que participen activamente en la vida política, social y cultural, aspectos que implican el ejercicio crítico y reflexivo. En la primera parte del documento se presentan algunos rasgos que identifican a la educación crítica, en tanto modelo que propende por formar seres humanos que piensen por sí mismos. Luego, se indaga acerca del fomento de prácticas educativas que permiten el desarrollo de competencias lógicas y argumentativas dado que la actitud crítica implica una evaluación racional. Por último, se resalta el papel de la filosofía y de la ciencia, pues en ellas se promueven deliberaciones sobre problemas teóricos y prácticos. En conclusión, la necesidad de estimular la actitud crítica es un elemento prioritario que la educación debe tener en cuenta, si lo que desea es promover seres humanos y sociedades que enfrenten de forma racional los problemas actuales

  15. Biochemical investigation of yttrium(III) complex containing 1,10-phenanthroline: DNA binding and antibacterial activity.

    Science.gov (United States)

    Khorasani-Motlagh, Mozhgan; Noroozifar, Meissam; Moodi, Asieh; Niroomand, Sona

    2013-03-05

    Characterization of the interaction between yttrium(III) complex containing 1,10-phenanthroline as ligand, [Y(phen)2Cl(OH2)3]Cl2⋅H2O, and DNA has been carried out by UV absorption, fluorescence spectra and viscosity measurements in order to investigate binding mode. The experimental results indicate that the yttrium(III) complex binds to DNA and absorption is decreasing in charge transfer band with the increase in amount of DNA. The binding constant (Kb) at different temperatures as well as thermodynamic parameters, enthalpy change (ΔH°) and entropy change (ΔS°), were calculated according to relevant fluorescent data and Vant' Hoff equation. The results of interaction mechanism studies, suggested that groove binding plays a major role in the binding of the complex and DNA. The activity of yttrium(III) complex against some bacteria was tested and antimicrobial screening tests shown growth inhibitory activity in the presence of yttrium(III) complex. Copyright © 2013 Elsevier B.V. All rights reserved.

  16. Aspectos morfológicos da placenta da preguiça, Bradypus variegatus Shinz, 1825

    OpenAIRE

    Marleyne José Afonso Accyoli Lins Amorin; Maria Angélica Miglino; Adelmar Afonso Amorin Júnior; Tatiana Carlesso dos Santos

    2003-01-01

    Estudaram-se os aspectos morfológicos da placenta e das membranas fetais de 03 placentas de bichos-preguiça (Bradypus variegatus), adultas e prenhes, originárias da Zona da Mata do Estado de Pernambuco. Essas estruturas foram obtidas de 03 fêmeas doadas pela Universidade Federal de Pernambuco, das quais duas encontravam-se congeladas e a terceira foi colhida mediante realização de cirurgia cesariana, onde mãe e feto foram preservados. Depois de descongeladas, as placentas foram fixadas em sol...

  17. Interaction of Eu(III) and Cm(III) with mucin. A key component of the human mucosa

    International Nuclear Information System (INIS)

    Wilke, Claudia; Barkleit, Astrid

    2017-01-01

    To evaluate the potential health risks caused by the ingestion of lanthanides (Ln) and actinides (An), investigations into the chemical behavior of these metals in the human gastrointestinal tract are necessary. Mucin is an important part of the protective mucosa layer in the digestive system. We have recently reported that mucin interacts strongly with Eu(III) and Cm(III), representatives of Ln(III) and An(III), respectively, under in vivo conditions. In order to investigate the complexation behavior of this protein with Ln(III)/An(III), TRLFS measurements were performed on Eu(III)/Cm(III)-mucin solutions with different protein concentrations and at different pH. The results indicate the formation of at least two independent mucin species. At higher pH, the formation of hydroxide species was also observed.

  18. Interaction of Eu(III) and Cm(III) with mucin. A key component of the human mucosa

    Energy Technology Data Exchange (ETDEWEB)

    Wilke, Claudia; Barkleit, Astrid [Helmholtz-Zentrum Dresden-Rossendorf e.V., Dresden (Germany). Chemistry of the F-Elements

    2017-06-01

    To evaluate the potential health risks caused by the ingestion of lanthanides (Ln) and actinides (An), investigations into the chemical behavior of these metals in the human gastrointestinal tract are necessary. Mucin is an important part of the protective mucosa layer in the digestive system. We have recently reported that mucin interacts strongly with Eu(III) and Cm(III), representatives of Ln(III) and An(III), respectively, under in vivo conditions. In order to investigate the complexation behavior of this protein with Ln(III)/An(III), TRLFS measurements were performed on Eu(III)/Cm(III)-mucin solutions with different protein concentrations and at different pH. The results indicate the formation of at least two independent mucin species. At higher pH, the formation of hydroxide species was also observed.

  19. Syntheses, structures, and magnetic properties of a family of heterometallic heptanuclear [Cu5Ln2] (Ln = Y(III), Lu(III), Dy(III), Ho(III), Er(III), and Yb(III)) complexes: observation of SMM behavior for the Dy(III) and Ho(III) analogues.

    Science.gov (United States)

    Chandrasekhar, Vadapalli; Dey, Atanu; Das, Sourav; Rouzières, Mathieu; Clérac, Rodolphe

    2013-03-04

    Sequential reaction of the multisite coordination ligand (LH3) with Cu(OAc)2·H2O, followed by the addition of a rare-earth(III) nitrate salt in the presence of triethylamine, afforded a series of heterometallic heptanuclear complexes containing a [Cu5Ln2] core {Ln = Y(1), Lu(2), Dy(3), Ho(4), Er(5), and Yb(6)}. Single-crystal X-ray crystallography reveals that all the complexes are dicationic species that crystallize with two nitrate anions to compensate the charge. The heptanuclear aggregates in 1-6 are centrosymmetrical complexes, with a hexagonal-like arrangement of six peripheral metal ions (two rare-earth and four copper) around a central Cu(II) situated on a crystallographic inversion center. An all-oxygen environment is found to be present around the rare-earth metal ions, which adopt a distorted square-antiprismatic geometry. Three different Cu(II) sites are present in the heptanuclear complexes: two possess a distorted octahedral coordination sphere while the remaining one displays a distorted square-pyramidal geometry. Detailed static and dynamic magnetic properties of all the complexes have been studied and revealed the single-molecule magnet behavior of the Dy(III) and Ho(III) derivatives.

  20. Upgrading program of the experimental fast reactor Joyo

    International Nuclear Information System (INIS)

    Yoshida, A.; Yogo, S.

    2001-01-01

    The experimental fast reactor Joyo finished its operation as an irradiation core in June, 2000. Throughout the operation of MK-I (breeder core) and MK-II (irradiation core), the net operation time has exceeded 60,000 hours. During these operations there were no fuel failures or serious plant problems. The MK-III modification program will improve irradiation capability to demonstrate advanced technologies for commercial Fast Breeder Reactor (FBR). When the MK-III core is started, it will support irradiation tests in feasibility studies for fast reactor and related fuel cycle research and development in Japan. (authors)

  1. Analysis, by Relap5 code, of boron dilution phenomena in a Small Break Loca Transient, performed in PKL III E 2.2 test

    International Nuclear Information System (INIS)

    Rizzo, G.; Vella, G.

    2007-01-01

    The present work is finalized to investigate the E2.2 thermal-hydraulics transient of the PKL III facility, which is a scaled reproduction of a typical German PWR, operated by FRAMATOME-ANP in Erlangen, Germany, within the framework of an international cooperation (OECD/SETH project). The main purpose of the project is to study boron dilution events in Pressurized Water Reactors and to contribute to the assessment of thermal-hydraulic system codes like Relap5. The experimental test PKL III E2.2 investigates the behavior of a typical PWR after a Small Break Loss Of Coolant Accident (SB-LOCA) in a cold leg and an immediate injection of borated water in two cold legs. The main purpose of this work is to simulate the PKL III test facility and particularly its experimental transient by Relap5 system code. The adopted nodalization, already available at Department of Nuclear Engineering (DIN), has been reviewed and applied with an accurate analysis of the experimental test parameters. The main result relies in a good agreement of calculated data with experimental measures for a number of main important variables. (author)

  2. La dispepsia funcional: Aspectos biopsicosociales, evaluación y terapia psicológica

    Directory of Open Access Journals (Sweden)

    Stefano Vinaccia Alpi

    2008-09-01

    Full Text Available Se abordan los aspectos conceptuales del trastorno gastrointestinal Dispepsia funcional (DP, en lo que se refiere a su definición, prevalencia, clasificación y diagnóstico.; las causas y consecuencias de la DF desde una perspectiva biopsicosocial (variables socioeconómicas, demandas psicosociales, evaluación cognitiva y estrategias de afrontamiento, personalidad y comportamiento, mecanismos psicobiológicos, calidad de vida, tratamiento y evolución; la evaluación psicológica de la DF desde la perspectiva procesual; y la intervención psicológica, con énfasis en el enfoque cognitivo conductual.

  3. Structural Characterization of Am(III)- and Pu(III)-DOTA Complexes.

    Science.gov (United States)

    Audras, Matthieu; Berthon, Laurence; Berthon, Claude; Guillaumont, Dominique; Dumas, Thomas; Illy, Marie-Claire; Martin, Nicolas; Zilbermann, Israel; Moiseev, Yulia; Ben-Eliyahu, Yeshayahu; Bettelheim, Armand; Cammelli, Sebastiano; Hennig, Christoph; Moisy, Philippe

    2017-10-16

    The complexation of 1,4,7,10-tetrazacyclodecane-1,4,7,10-tetraacetic acid (DOTA) ligand with two trivalent actinides (Am 3+ and Pu 3+ ) was investigated by UV-visible spectrophotometry, NMR spectroscopy, and extended X-ray absorption fine structure in conjunction with computational methods. The complexation process of these two cations is similar to what has been previously observed with lanthanides(III) of similar ionic radius. The complexation takes place in different steps and ends with the formation of a (1:1) complex [(An(III)DOTA)(H 2 O)] - , where the cation is bonded to the nitrogen atoms of the ring, the four carboxylate arms, and a water molecule to complete the coordination sphere. The formation of An(III)-DOTA complexes is faster than the Ln(III)-DOTA systems of equivalent ionic radius. Furthermore, it is found that An-N distances are slightly shorter than Ln-N distances. Theoretical calculations showed that the slightly higher affinity of DOTA toward Am over Nd is correlated with slightly enhanced ligand-to-metal charge donation arising from oxygen and nitrogen atoms.

  4. Types I and III procollagen extension peptides in serum respond to fracture in humans

    DEFF Research Database (Denmark)

    Joerring, S; Jensen, L T; Andersen, G R

    1992-01-01

    Markers of types I and III collagen turnover were measured in serial blood samples in 16 patients with a Colles' fracture. The collagen markers were the carboxy-terminal extension peptide of type I procollagen (PICP) and the amino-terminal extension peptide of type III procollagen (PIIINP......). Significant increases were found of PIIINP within 1 week and of PICP within 2 weeks. This sequential appearance of PIIINP and PICP was found to be in agreement with the appearance of types III and I collagen during early fracture healing as demonstrated in previous animal experimental studies. PICP had...... levelled off after 9 months, whereas PIIINP remained elevated. Osteocalcin, a serum marker of osteoblast activity, increased within 1 week and levelled off after 9 months. Correlations between the change in osteocalcin and those in PICP and PIIINP, respectively, were weak. These new biochemical markers may...

  5. Synthesis, structure, luminescent, and magnetic properties of carbonato-bridged Zn(II)2Ln(III)2 complexes [(μ4-CO3)2{Zn(II)L(n)Ln(III)(NO3)}2] (Ln(III) = Gd(III), Tb(III), Dy(III); L(1) = N,N'-bis(3-methoxy-2-oxybenzylidene)-1,3-propanediaminato, L(2) = N,N'-bis(3-ethoxy-2-oxybenzylidene)-1,3-propanediaminato).

    Science.gov (United States)

    Ehama, Kiyomi; Ohmichi, Yusuke; Sakamoto, Soichiro; Fujinami, Takeshi; Matsumoto, Naohide; Mochida, Naotaka; Ishida, Takayuki; Sunatsuki, Yukinari; Tsuchimoto, Masanobu; Re, Nazzareno

    2013-11-04

    Carbonato-bridged Zn(II)2Ln(III)2 complexes [(μ4-CO3)2{Zn(II)L(n)Ln(III)(NO3)}2]·solvent were synthesized through atmospheric CO2 fixation reaction of [Zn(II)L(n)(H2O)2]·xH2O, Ln(III)(NO3)3·6H2O, and triethylamine, where Ln(III) = Gd(III), Tb(III), Dy(III); L(1) = N,N'-bis(3-methoxy-2-oxybenzylidene)-1,3-propanediaminato, L(2) = N,N'-bis(3-ethoxy-2-oxybenzylidene)-1,3-propanediaminato. Each Zn(II)2Ln(III)2 structure possessing an inversion center can be described as two di-μ-phenoxo-bridged {Zn(II)L(n)Ln(III)(NO3)} binuclear units bridged by two carbonato CO3(2-) ions. The Zn(II) ion has square pyramidal coordination geometry with N2O2 donor atoms of L(n) and one oxygen atom of a bridging carbonato ion at the axial site. Ln(III) ion is coordinated by nine oxygen atoms consisting of four from the deprotonated Schiff-base L(n), two from a chelating nitrate, and three from two carbonate groups. The temperature-dependent magnetic susceptibilities in the range 1.9-300 K, field-dependent magnetization from 0 to 5 T at 1.9 K, and alternating current magnetic susceptibilities under the direct current bias fields of 0 and 1000 Oe were measured. The magnetic properties of the Zn(II)2Ln(III)2 complexes are analyzed on the basis of the dicarbonato-bridged binuclear Ln(III)-Ln(III) structure, as the Zn(II) ion with d(10) electronic configuration is diamagnetic. ZnGd1 (L(1)) and ZnGd2 (L(2)) show a ferromagnetic Gd(III)-Gd(III) interaction with J(Gd-Gd) = +0.042 and +0.028 cm(-1), respectively, on the basis of the Hamiltonian H = -2J(Gd-Gd)ŜGd1·ŜGd2. The magnetic data of the Zn(II)2Ln(III)2 complexes (Ln(III) = Tb(III), Dy(III)) were analyzed by a spin Hamiltonian including the crystal field effect on the Ln(III) ions and the Ln(III)-Ln(III) magnetic interaction. The Stark splitting of the ground state was so evaluated, and the energy pattern indicates a strong easy axis (Ising type) anisotropy. Luminescence spectra of Zn(II)2Tb(III)2 complexes were observed, while those

  6. WISC-III e WAIS-III na avaliação da inteligência de cegos WISC-III/WAIS-III en ciegos WISC-III and WAIS-III in intellectual assessment of blind people

    OpenAIRE

    Elizabeth do Nascimento; Carmen Elvira Flores-Mendoza

    2007-01-01

    Diante da escassez de pesquisas nacionais e de testes psicológicos destinados a avaliar pessoas cegas, desenvolveu-se um estudo psicométrico com as escalas verbais dos testes WISC-III e WAIS-III. Após as adaptações de alguns estímulos e das instruções, os testes foram aplicados em crianças (N = 120) e adultos (N = 52) residentes em Belo Horizonte. Os resultados indicaram que as escalas verbais modificadas apresentam uma boa consistência interna (alfa> 0,80). Além disso, a investigação da vali...

  7. Analysis of the SPERT III E-core experiment using the EUREKA-2 code

    International Nuclear Information System (INIS)

    Harami, Taikan; Uemura, Mutsumi; Ohnishi, Nobuaki

    1986-09-01

    EUREKA-2, a coupled nuclear thermal hydrodynamic kinetic code, was adapted for the testing of models and methods. Code evaluations were made with the reactivity addition experiments of the SPERT III E-Core, a slightly enriched oxide core. The code was tested for non damaging power excursions including a wide range of initial operating conditions, such as cold-startup, hot-startup, hot-standby and operating-power initial conditions. Comparisons resulted in a good agreement within the experimental errors between calculated and experimental power, energy, reactivity and clad surface temperature. (author)

  8. Dark matter detection - III

    International Nuclear Information System (INIS)

    Zacek, Viktor

    2015-01-01

    The quest for the missing mass of the universe has become one of the big challenges of todays particle physics and cosmology. Astronomical observations show that only 1% of the matter of the Universe is luminous. Moreover there is now convincing evidence that 85% of all gravitationally observable matter in the Universe is of a new exotic kind, different from the 'ordinary' matter surrounding us. In a series of three lectures we discuss past, recent and future efforts made world- wide to detect and/or decipher the nature of Dark Matter. In Lecture I we review our present knowledge of the Dark Matter content of the Universe and how experimenters search for it's candidates; In Lecture II we discuss so-called 'direct detection' techniques which allow to search for scattering of galactic dark matter particles with detectors in deep-underground laboratories; we discuss the interpretation of experimental results and the challenges posed by different backgrounds; In Lecture III we take a look at the 'indirect detection' of the annihilation of dark matter candidates in astrophysical objects, such as our sun or the center of the Milky Way; In addition we will have a look at efforts to produce Dark Matter particles directly at accelerators and we shall close with a look at alternative nonparticle searches and future prospects. (author)

  9. Microbial reduction of Fe(III) and turnover of acetate in Hawaiian soils.

    Science.gov (United States)

    Küsel, Kirsten; Wagner, Christine; Trinkwalter, Tanja; Gössner, Anita S; Bäumler, Rupert; Drake, Harold L

    2002-04-01

    Soils contain anoxic microzones, and acetate is an intermediate during the turnover of soil organic carbon. Due to negligible methanogenic activities in well-drained soils, acetate accumulates under experimentally imposed short-term anoxic conditions. In contrast to forest, agricultural, and prairie soils, grassland soils from Hawaii rapidly consumed rather than formed acetate when incubated under anoxic conditions. Thus, alternative electron acceptors that might be linked to the anaerobic oxidation of soil organic carbon in Hawaiian soils were assessed. Under anoxic conditions, high amounts of Fe(II) were formed by Hawaiian soils as soon as soils were depleted of nitrate. Rates of Fe(II) formation for different soils ranged from 0.01 to 0.31 micromol (g dry weight soil)(-1) h(-1), but were not positively correlated to increasing amounts of poorly crystallized iron oxides. In general, sulfate-reducing and methanogenic activities were negligible. Supplemental acetate was rapidly oxidized to CO2 via the sequential reduction of nitrate and Fe(III) in grassland soil (obtained near Kaena State Park). Supplemental H2 stimulated the formation of Fe(II), but H2-utilizing acetogens appeared to also be involved in the consumption of H2. Approximately 270 micromol Fe(III) (g dry weight soil)(-1) was available for Fe(III)-reducing bacteria, and acetate became a stable end product when Fe(III) was depleted in long-term incubations. Most-probable-number estimates of H2- and acetate-utilizing Fe(III) reducers and of H2-utilizing acetogens were similar. These results indicate that (i) the microbial reduction of Fe(III) is an important electron-accepting process for the anaerobic oxidation of organic matter in Fe(III)-rich Hawaiian soils of volcanic origin, and (ii) acetate, formed by the combined activity of fermentative and acetogenic bacteria, is an important trophic link in anoxic microsites of these soils.

  10. GeNF - Experimental report 2008

    Energy Technology Data Exchange (ETDEWEB)

    Pranzas, Philipp Klaus; Mueller, Martin; Willumeit, Regine; Schreyer, Andreas [GKSS-Forschungszentrum Geesthacht GmbH (Germany). Inst. fuer Materialforschung

    2009-12-11

    At the Geesthacht Neutron Facility GeNF about 182 experiments were performed in 2008 by GKSS and by or for external users, partners or contractors. In most cases the measurements were performed and analysed in cooperation by the guests, by GKSS staff or by the permanent external user group staff. The activities, which are based on a proposal procedure and on the in house R and D program, are reported in 76 contributions in the present annual experimental report for the year 2008. The contributions may contain several combined experiments. During 2008 the GKSS research reactor FRG-1 achieved an operation time of 175 days at the full 5 MW reactor power providing a neutron flux of ca. 1.4.10{sup 14} thermal neutrons/cm{sup 2} s. The focus of the in house R and D work at GeNF instruments in 2008 was the characterisation of nanostructures in engineering materials, the analysis of stresses and textures in welds and technical structures at SANS-2, DCD, ARES-2 and TEX-2, the structural investigation of hydrogen containing substances such as polymers, colloids and biological macromolecules at SANS-1 as well as the characterisation of magnetic thin films at NeRo, PNR, POLDI and ROeDI. The modern experiment control hardware (e.g. sample environments, like magnets, cryostats or furnaces) and software based on LabView was continuously improved on all instruments. In the appendices I and II the experimental reports of the GKSS outstation at the FRM II are attached as well as of the GKSS outstation at DESY. The massive activity at the FRM II outstation is documented by the increasing number of REFSANS reports, accumulated to nine. Three reports show the activities of GKSS in the field of texture measurement at the instrument STRESS-SPEC. The instrument HARWI II at the synchrotron storage ring DORIS III at DESY is accepted very well by the community and is heavily overbooked in all fields (tomography, diffraction, etc.). After an 8-month shutdown period for an upgrade in the frame

  11. GeNF - Experimental report 2008

    International Nuclear Information System (INIS)

    Pranzas, Philipp Klaus; Mueller, Martin; Willumeit, Regine; Schreyer, Andreas

    2009-01-01

    At the Geesthacht Neutron Facility GeNF about 182 experiments were performed in 2008 by GKSS and by or for external users, partners or contractors. In most cases the measurements were performed and analysed in cooperation by the guests, by GKSS staff or by the permanent external user group staff. The activities, which are based on a proposal procedure and on the in house R and D program, are reported in 76 contributions in the present annual experimental report for the year 2008. The contributions may contain several combined experiments. During 2008 the GKSS research reactor FRG-1 achieved an operation time of 175 days at the full 5 MW reactor power providing a neutron flux of ca. 1.4.10 14 thermal neutrons/cm 2 s. The focus of the in house R and D work at GeNF instruments in 2008 was the characterisation of nanostructures in engineering materials, the analysis of stresses and textures in welds and technical structures at SANS-2, DCD, ARES-2 and TEX-2, the structural investigation of hydrogen containing substances such as polymers, colloids and biological macromolecules at SANS-1 as well as the characterisation of magnetic thin films at NeRo, PNR, POLDI and ROeDI. The modern experiment control hardware (e.g. sample environments, like magnets, cryostats or furnaces) and software based on LabView was continuously improved on all instruments. In the appendices I and II the experimental reports of the GKSS outstation at the FRM II are attached as well as of the GKSS outstation at DESY. The massive activity at the FRM II outstation is documented by the increasing number of REFSANS reports, accumulated to nine. Three reports show the activities of GKSS in the field of texture measurement at the instrument STRESS-SPEC. The instrument HARWI II at the synchrotron storage ring DORIS III at DESY is accepted very well by the community and is heavily overbooked in all fields (tomography, diffraction, etc.). After an 8-month shutdown period for an upgrade in the frame of the

  12. Further Analysis on the Mystery of the Surveyor III Dust Deposits

    Science.gov (United States)

    Metzger, Philip; Hintze, Paul; Trigwell, Steven; Lane, John

    2012-01-01

    The Apollo 12 lunar module (LM) landing near the Surveyor III spacecraft at the end of 1969 has remained the primary experimental verification of the predicted physics of plume ejecta effects from a rocket engine interacting with the surface of the moon. This was made possible by the return of the Surveyor III camera housing by the Apollo 12 astronauts, allowing detailed analysis of the composition of dust deposited by the LM plume. It was soon realized after the initial analysis of the camera housing that the LM plume tended to remove more dust than it had deposited. In the present study, coupons from the camera housing have been reexamined. In addition, plume effects recorded in landing videos from each Apollo mission have been studied for possible clues.

  13. Richard III

    DEFF Research Database (Denmark)

    Lauridsen, Palle Schantz

    2017-01-01

    Kort analyse af Shakespeares Richard III med fokus på, hvordan denne skurk fremstilles, så tilskuere (og læsere) langt henad vejen kan føle sympati med ham. Med paralleller til Netflix-serien "House of Cards"......Kort analyse af Shakespeares Richard III med fokus på, hvordan denne skurk fremstilles, så tilskuere (og læsere) langt henad vejen kan føle sympati med ham. Med paralleller til Netflix-serien "House of Cards"...

  14. NMR and TRLFS studies of Ln(iii) and An(iii) C5-BPP complexes.

    Science.gov (United States)

    Adam, Christian; Beele, Björn B; Geist, Andreas; Müllich, Udo; Kaden, Peter; Panak, Petra J

    2015-02-01

    C5-BPP is a highly efficient N-donor ligand for the separation of trivalent actinides, An(iii), from trivalent lanthanides, Ln(iii). The molecular origin of the selectivity of C5-BPP and many other N-donor ligands of the BTP-type is still not entirely understood. We present here the first NMR studies on C5-BPP Ln(iii) and An(iii) complexes. C5-BPP is synthesized with 10% 15 N labeling and characterized by NMR and LIFDI-MS methods. 15 N NMR spectroscopy gives a detailed insight into the bonding of C5-BPP with lanthanides and Am(iii) as a representative for trivalent actinide cations, revealing significant differences in 15 N chemical shift for coordinating nitrogen atoms compared to Ln(iii) complexes. The temperature dependence of NMR chemical shifts observed for the Am(iii) complex indicates a weak paramagnetism. This as well as the observed large chemical shift for coordinating nitrogen atoms show that metal-ligand bonding in Am(C5-BPP) 3 has a larger share of covalence than in lanthanide complexes, confirming earlier studies. The Am(C5-BPP) 3 NMR sample is furthermore spiked with Cm(iii) and characterized by time-resolved laser fluorescence spectroscopy (TRLFS), yielding important information on the speciation of trace amounts of minor complex species.

  15. Separation by liquid-liquid extraction of actinides(III) from lanthanides(III) using new molecules: the picolinamides; Separation par extraction liquide-liquide des actinides(III) des lanthanides(III) par de nouvelles molecules: les picolinamides

    Energy Technology Data Exchange (ETDEWEB)

    Cordier, P Y [CEA Marcoule, Departement de Recherche en Retraitement et en Vitrification, 30 - Bagnols-sur-Ceze (France); [Clermont-Ferrand-2 Univ., 63 - Aubiere (France)

    1996-07-01

    In the field of long-lived radionuclides separation from waste generated during spent fuel reprocessing, the picolinamides have been chosen as potential extractants for the selective extraction of actinides (III) from lanthanides (III). The first studies initiated on the most simple molecule of the picolinamide family, namely 2-pyridinecarboxamide, pointed out that in an aqueous media the complexation stability constant between this ligand and Am(III) is roughly 10 times higher than the ones corresponding to Ln(III). The synthesis of lipophilic derivatives of 2-pyridinecarboxamide leaded to extraction experiments. The extraction of metallic cation by lipophilic picolinamides, according to a solvatation mechanism, is strongly dependent on the nature of the amide function: a primary amide function (group I) leads to a good extraction; on the contrary, there is a decrease for secondary (group II) and tertiary (group III) amide functions. From a theoretical point of view, this work leads finally to the following conclusions: confirmation of the importance of the presence of soft donor atoms within the extractants (nitrogen in our case) for An(III)/Ln(III). Also, sensitivity of this soft donor atom regarding the protonation reaction; prevalence in our case of the affinity of the extractant for the metallic cation over the lipophilia of the extractant to ensure good distribution coefficients. The extraction and Am(III)/Ln(III) separation performances of the picolinamides from pertechnetic media leads to the design of a possible flowsheet for the reprocessing of high level liquid waste, with the new idea of an integrated technetium reflux. (author) 105 refs.

  16. Extraction behaviour of Am(III) and Eu(III) from nitric acid medium in TEHDGA-HDEHP impregnated resins

    Energy Technology Data Exchange (ETDEWEB)

    Saipriya, G.; Kumar, T. [Bhabha Atomic Research Centre Facilities, Kalpakkam (India). Kalpakkam Reprocessing Plant; Kumaresan, R.; Nayak, P.K.; Venkatesan, K.A.; Antony, M.P. [Indira Gandhi Center for Atomic Research, Kalpakkam (India). Fuel Chemistry Div.

    2016-07-01

    The extraction behaviour of Am(III) and Eu(III) from nitric acid medium was studied in the solvent impregnated resins containing extractants such as tetra-bis(2-ethylhexyl)diglycolamide (TEHDGA) or bis-(2-ethylhexyl)phosphoric acid (HDEHP) or mixture of TEHDGA+HDEHP. The rate of extraction of Am(III) and Eu(III) from 1 M nitric acid and the effect of various parameters, such as the concentration of nitric acid in aqueous phase and concentration of TEHDGA and HDEHP in resin phase, on the distribution coefficient of Am(III) and Eu(III) was studied. The distribution coefficient of Am(III) and Eu(III) in HDEHP-impregnated resin decreased and that in TEHDGA-impregnated resin increased, with increase in the concentration of nitric acid. However, in (TEHDGA+HDEHP) - impregnated resin, synergic extraction was observed at lower nitric acid concentration and antagonism at higher nitric acid concentration. The mechanism of Am(III) and Eu(III) extraction in the combined resin was investigated by slope analysis method. The extraction of various metal ions present in the fast reactor simulated high-level liquid waste was studied. The separation factor of Am(III) over Eu(III) was studied using citrate-buffered diethylenetriaminepentaacetic acid (DTPA) solution.

  17. Characterization of the lanthanum(III) and europium(III) trichloroacetate complexes extracted with 18-crown-6

    International Nuclear Information System (INIS)

    Imura, H.; Saito, Y.; Ohashi, K.; Meguro, Y.; Yoshida, Z.; Choppin, G.R.

    1996-01-01

    Extraction of lanthanide(III) ions with 18-crown-6 (18C6) and trichloroacetate (tca) has been studied. The composition, hydration, and structure of the La(III) and Eu(III) complexes extracted into 1,2-dichloroethane were investigated by using several methods such as the liquid-liquid distribution technique, conductimetry, Karl Fisher titration, laser luminescence spectroscopy, and 1 H NMR. The La(III) complex was found to be a monohydrate, La(tca) 3 (18C6)(H 2 O), while that of Eu(III) was a mixture of a monohydrate and a dihydrate, i.e., Eu(tca) 3 (18C6)(H 2 O) and Eu(tca) 3 (18C6)(H 2 O) 2 . The origin of the selectivity by 18C6 which gives much higher extractability of La(III) than of Eu(III) is explained by considering the hydration and probable structure of their complexes. 12 refs., 5 figs., 4 tabs

  18. Aspectos psicosociales del embarazo en la adolescencia, año 2000

    Directory of Open Access Journals (Sweden)

    Elena Ávila Gálvez

    2002-12-01

    Full Text Available Se realizó un estudio explicativo-observacional, de tipo estudio de casos y controles, en adolescentes entre 10 y 19 años, del sexo femenino, provenientes del Policlínico Docente "Wilfredo Pérez Pérez", en el año 2000, compartidos en 2 grupos: el estudio, con 53 casos que se embarazaron, y el control con 106 adolescentes que no lo hicieron. Se compararon diferentes aspectos de la sexualidad, esfera familiar y sociodemográficos, con el fin de determinar la influencia de algunos aspectos psicosociales del embarazo en la adolescencia. La mayoría de las adolescentes del grupo estudio se incluían en la adolescencia tardía, con inestabilidad en la pareja, mejor nivel de instrucción de los padres, mayor porcentaje que no estudiaba ni trabajaba, con padres divorciados, criadas solamente por la madre, de familias disfuncionales, con inicio precoz de la actividad sexual sin anticonceptivos, con problemas psicológicos que se enmarcaban en el hogar y la familia.An explanatory-observational case-control type-study was performed on female adolescents aged 10-19 years from "Wilfredo Pérez Pérez Teaching Polyclinics in the year 2000. They were divided into two groups: the study group comprising 53 pregnant patients and the control group including 106 adolescents who were not pregnant. Several aspects related to sexuality, family environment and also socio-demographic questions were compared to determine the impact of some psychosocial aspects of pregnancy in adolescence. Most of the adolescents in the study group were in their late adolescence, they had no permanent partner, their parents had a higher level of education; a high number of them neither studied nor worked, their parents were mostly divorced, they were raised by their mothers only, they were from dysfunctional families, with early beginning of sexual intercourse without contraceptives and psychological problems involving the family and the house.

  19. Aspectos médicos, genéticos y psicosociales del síndrome Usher

    OpenAIRE

    Dyce Gordon, Elisa; Mapolón Arcendor, Yolanda; Santana Álvarez, Jorge

    2011-01-01

    Fundamento: el síndrome Usher es una enfermedad genética, que se caracteriza por hipoacusia neurosensorial progresiva bilateral congénita, pérdida de visión debida a la retinosis pigmentaria y en ocasiones presenta también trastornos vestibulares. Objetivo: describir los principales aspectos médicos, genéticos y psicosociales presentes en los pacientes con síndrome Usher. Método: se realizó un estudio descriptivo transversal en 14 pacientes con diagnóstico de síndrome Usher atendidos en el Ce...

  20. Conjecturas da Epistemológia Jurídica e Aspectos da Teoria da Linguagem

    OpenAIRE

    Oliveira, Rita de Cássia Cartelli de; Cesumar; Motta, Ivan Dias; Cesumar

    2008-01-01

    Apresentar-se-ão reflexões em torno da epistemologia jurídica e alguns aspectos da teoria da linguagem; a necessidade de acompanhamento e aprimoramento da linguagem jurídica, para que o direito não se distancie da realidade, mantendo-se apenas como um sistema do status quo; uma breve análise de algumas teorias da ciência do direito e da linguagem; as especificidades dos termos lingüísticos para a análise da ciência do direito, pautada na contemporaneidade sob a perspectiva humanista, buscando...

  1. Aspectos da aposentadoria por tempo de serviço nos estados-partes do Mercosul

    OpenAIRE

    Oliveira, Aldemir de.

    2008-01-01

    Tese (doutorado) - Universidade Federal de Santa Catarina, Centro de Ciências Jurídicas. Programa de Pós-Graduação em Direito. O objeto desta tese são os aspectos da Aposentadoria por tempo de serviço nos Estados-Partes do MERCOSUL. A escolha do tema é dar uma contribuição jurídica, para que os trabalhadores mercosulinos, em especial argentinos, paraguaios e uruguaios, na qualidade de segurados obrigatórios, por prestarem, ou terem prestado serviços, nesses territórios, e sujeitos à legis...

  2. BWR 2 % main recirculation line break LOCA tests RUNs 915 and 920 without HPCS in ROSA-III program

    International Nuclear Information System (INIS)

    Suzuki, Mitsuhiro; Nakamura, Hideo; Anoda, Yoshinari; Kumamaru, Hiroshige; Yonomoto, Taisuke; Koizumi, Yasuo; Tasaka, Kanji

    1987-03-01

    This report presents the experimental results of BWR LOCA integral tests, RUNs 915 and 920, which are performed in the ROSA-III program simulating 2 % main recirculation line break LOCA tests with and without pressure control system operation. The ROSA-III test facility simulates a BWR system with volume scale of 1/424 and has four half-length electrically heated fuel bundles, two active recirculation loops, four types of ECCS's, and steam and feedwater systems. The report presents (1) the experimental results of 2 % small break LOCA phanomena in the ROSA-III system and (2) the effects of the pressure control system on the LOCA phenomena. The pressure control system contributed to (A) prevent bulk flashing in the early blowdown phase, (B) early closure of MSIV by L2 level trip, (C) early actuation of ADS by L1 level trip. However, the core thermal responses of the two tests were similar because of the similar mass inventory in PV after the ADS actuation in both tests. (author)

  3. ZnCl{sub 2}-activated biochar from biogas residue facilitates aqueous As(III) removal

    Energy Technology Data Exchange (ETDEWEB)

    Xia, Dong; Tan, Fen; Zhang, Chuanpan [Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, and The Key Laboratory for Synthetic Biotechnology of Xiamen City, Xiamen University, Xiamen 361005 (China); Jiang, Xiuli; Chen, Zheng; Li, Heng [Environmental Science Research Center, College of the Environment & Ecology, Xiamen University, Xiamen 361110 (China); Zheng, Yanmei [Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, and The Key Laboratory for Synthetic Biotechnology of Xiamen City, Xiamen University, Xiamen 361005 (China); Li, Qingbiao [Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, and The Key Laboratory for Synthetic Biotechnology of Xiamen City, Xiamen University, Xiamen 361005 (China); Environmental Science Research Center, College of the Environment & Ecology, Xiamen University, Xiamen 361110 (China); Wang, Yuanpeng, E-mail: wypp@xmu.edu.cn [Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, and The Key Laboratory for Synthetic Biotechnology of Xiamen City, Xiamen University, Xiamen 361005 (China)

    2016-07-30

    Highlights: • The ZnCl{sub 2}-activated biochar from the biogas residue of pig manure showed an excellent ability to remove As(III). • ZnCl{sub 2}-activated biochar had a large BET surface area and well-distributed pore structure. • Zinc played a dominant role in the removal of As(III) by forming Zn-O-As(III). - Abstract: Biochars prepared from biogas residue using different chemical activators were investigated for their As(III) adsorption properties. The results indicated that the original biochars did not exhibit significant As(III) adsorption. However, ZnCl{sub 2}-activated biochar, which possessed the largest specific surface area, 516.67 cm{sup 2}/g, and exhibited a perfectly porous texture, showed excellent performance in a 500 μgL{sup −1} solution of As(III). Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy were utilized to identify the mechanism of As(III) adsorption by ZnCl{sub 2}-activated biochar. Adsorption was found to occur mainly through ligand exchange of the hydroxyl in Zn-OH to form Zn-O-As(III), as well as through porous adsorption. As a low-cost adsorbent, the adsorption process was well fitted using a pseudo-second-order model, with an R{sup 2} > 0.993. The adsorption process was fast, requiring nearly 90 min to reach adsorption equilibrium. Batch adsorption experimental results indicated that ZnCl{sub 2}-activated biochar has a maximum adsorption capacity of 27.67 mg/g at pH 7.0, and the adsorption process followed the Freundlich isotherm model well, with an R{sup 2} > 0.994. In addition, the current work demonstrated the efficiency of using ZnCl{sub 2}-activated biochar adsorbent to treat As(III)-contaminated water.

  4. Purification of chicken carbonic anhydrase isozyme-III (CA-III) and its measurement in White Leghorn chickens.

    Science.gov (United States)

    Nishita, Toshiho; Tomita, Yuichiro; Yorifuji, Daisuke; Orito, Kensuke; Ochiai, Hideharu; Arishima, Kazuyosi

    2011-11-26

    The developmental profile of chicken carbonic anhydrase-III (CA-III) blood levels has not been previously determined or reported. We isolated CA-III from chicken muscle and investigated age-related changes in the levels of CA-III in blood. CA-III was purified from chicken muscle. The levels of CA-III in plasma and erythrocytes from 278 female chickens (aged 1-93 weeks) and 68 male chickens (aged 3-59 weeks) were determined by ELISA. The mean level of CA-III in female chicken erythrocytes (1 week old) was 4.6 μg/g of Hb, and the CA-III level did not change until 16 weeks of age. The level then increased until 63 weeks of age (11.8 μg/g of Hb), decreased to 4.7 μg/g of Hb at 73 weeks of age, and increased again until 93 weeks of age (8.6 μg/g of Hb). The mean level of CA-III in erythrocytes from male chickens (3 weeks old) was 2.4 μg/g of Hb, and this level remained steady until 59 weeks of age. The mean plasma level of CA-III in 1-week-old female chickens was 60 ng/mL, and this level was increased at 3 weeks of age (141 ng/mL) and then remained steady until 80 weeks of age (122 ng/mL). The mean plasma level of CA-III in 3-week-old male chickens was 58 ng/mL, and this level remained steady until 59 weeks of age. We observed both developmental changes and sex differences in CA-III concentrations in White Leghorn (WL) chicken erythrocytes and plasma. Simple linear regression analysis showed a significant association between the erythrocyte CA-III level and egg-laying rate in WL-chickens 16-63 weeks of age (p < 0.01).

  5. A Reforma do Ordo Missae no Vaticano II: aspectos históricos teológicos e pastorais (The Reform of the Ordo Missae Vatican II: historical aspects theological and pastoral

    Directory of Open Access Journals (Sweden)

    Vanderson de Sousa Silva

    2012-10-01

    Full Text Available No presente artigo tratar-se-á da reforma do Ordo Missae perpetrado pelo Concílio Ecumênico Vaticano II (1962-1965, em seus aspectos históricos e teológicos, bem como as incidências pastorais da mesma. Buscar-se-á como delimitação somente analisar a reforma do Ordo Missae, no que tange as Orações Eucarísticas implementadas pela reforma conciliar, especialmente ao problema da ‘reforma’ do Ordo Missae, do Cânon Romano e das novas Orações Eucarísticas. Em suma, vislumbra-se a reforma litúrgica, os aspectos teológicos da Sacrosanctum Concilio e o ‘problema do Cânon’. O Concílio optou por retornar às fontes, redescobriu as Anáforas Eucarísticas Ocidentais e Orientais e adaptou-as nas Novas Orações Eucarísticas: a Anáfora de Hipólito de Roma em sua obra Traditio Apostolica que foi adaptada para ser a Oração Eucarística II; a Oração Eucarística III é inspirada na liturgia galicana e moçarábica; a Oração Eucarística IV de inspiração na Anáfora de Basílio e no Brasil somente, a Oração Eucarística V. Palavras-chave: Ordo Missae. Concílio Vaticano II. Orações Eucarísticas.  Abstract: The Reform Ordo Missae Vatican II: historical, ,theological and pastoral aspects. This article deals with the reform of the Ordo Missae held by the Second Vatican Council (1962-1965, in their historical and theological aspects, as well as its pastoral implications. The text will analyze the reform of Ordo Missae regarding the Eucharistic Prayers implemented by the Conciliar reform, especially the problem of 'reform' of the Ordo Missae, the Roman Canon and new Eucharistic Prayers. In short, this analysis aims to liturgical reform, the theological aspects of Sacrosanctum council and the 'problem of the canon'. The council opted to return to the sources, rediscovered the Eucharistic Anaphoras and adapted them in New Eucharistic Prayers: the Anaphora of Hippolytus of Rome in his Traditio Apostilica which was adapted for

  6. Implante Autólogo Ovariano no Omento Maior: Estudo Experimental Ovarian Autotransplantation to the Greater Omentum: Experimental Model

    Directory of Open Access Journals (Sweden)

    Luiz Ronaldo Alberti

    2002-01-01

    Full Text Available Objetivos: avaliar os aspectos morfofuncionais de ovários implantados no omento maior, bem como a melhor técnica para implantação do ovário: se íntegro ou fatiado. Métodos: foram divididas aleatoriamente 40 ratas Wistar com ciclos estrais normais em quatro grupos: Grupo I (n = 5, controle - laparotomia; Grupo II (n = 5, ooforectomia total bilateral; Grupo III (n = 15, implante autólogo íntegro no omento maior e Grupo IV (n = 15, implante autólogo fatiado no omento maior. Realizaram-se esfregaços vaginais nos 3º e 6º mes pós-operatório e estudos histológicos dos implantes ovarianos, avaliando-se: degeneração, fibrose, reação inflamatória, angiogênese, cistos foliculares, desenvolvimento folicular e corpos lúteos. Resultados: os animais do Grupo I ciclaram normalmente. As ratas do Grupo II não apresentaram ciclo, permanecendo em diestro. No Grupo III, 11 ratas permaneceram em diestro, três apresentaram ciclos incompletos e apenas uma ciclou normalmente. No Grupo IV, três animais não ciclaram, oito tiveram esfregaços vaginais incompletos e quatro ciclaram normalmente. Os achados histológicos dos animais pertencentes ao Grupo III evidenciaram histoarquitetura normal em dez ratas, porém nas outras cinco, houve degeneração ovariana. No Grupo IV, 14 ratas tiveram ovários com histoarquitetura preservada e em apenas uma houve sinais de degeneração. Conclusões: o implante autólogo ovariano no omento maior foi viável, obtendo-se melhor preservação morfofuncional com a implantação de fatias.Purpose: in order to maintain the gonadal function after oophorectomy, morphofunctional aspects of ovarian autotransplantation to the greater omentum and the best kind of implantation, intact or sliced, were investigated. Methods: forty cycling female Wistar rats were randomly divided into four groups: Group I (n = 5, control - laparotomy; Group II (n = 5, bilateral oophorectomy; Group III (n = 10, intact ovarian

  7. ASPECTOS SEMÁNTICOS EN LOS ENTORNOS VIRTUALES DE FORMACIÓN

    Directory of Open Access Journals (Sweden)

    Ana Vanessa Leguízamo León

    2010-07-01

    Full Text Available La semántica es un elemento necesario en cualquier actividad de aprendizaje, independientemente del contexto en el que nos encontremos. Los entornos virtuales de formación, como instituciones sociales mediadas por tecnología, tienen también una semántica asociada, que muchas veces es poco valorada por las personas que los diseñan. El componente semántico en estos entornos facilita la negociación de significados, que debe ocurrir para que los estudiantes puedan apropiarse de conocimiento y asociarlo con alguno de los patrones semánticos que ya posee, o crear uno nuevo. Se muestran aquí los aspectos semánticos que deben estar presentes en los entornos virtuales de formación, para situar al estudiante en el contexto semántico propuesto por el docente y que lo conduzca a un aprendizaje significativo.

  8. Aspectos biológicos y control de un gracilláriido (Gracillariidae: Lepidóptera) en Caesalpinia spinosa (Mol.) Kuntze (1898), en Cajamarca, Perú

    OpenAIRE

    Murga Orrillo, Hipólito; Abanto Rodriguez, Carlos; Polo Vargas, Ana Rosa

    2016-01-01

    Se tuvo por objetivo determinar aspectos biológicos, identificar enemigos naturales, y establecer periodos oportunos de control de un gracillariido plaga de tara. Los aspectos biológicos y los enemigos naturales se evaluaron en campo y en laboratorio, los periodos oportunos de control se determinó por interacción hospedero-plaga. Los resultados, el huevo dura 7,8 días y mide 0,34x0,21mm; la larva presenta 4 instares y dura 35,7 días, variando de medidas entre 1o y 4o instar de 0,09 a 0,65 mm ...

  9. Extraction and stripping of neodymium (III) and dysprosium (III) by TRUEX solvent

    International Nuclear Information System (INIS)

    Rout, Alok; Venkatesan, K.A.; Antony, M.P.; Srinivasan, T.G.; Vasudeva Rao, P.R.

    2009-01-01

    McCabe-Thiele diagram for the extraction and stripping of Nd (III) and Dy (III) by TRUEX solvent has been constructed to determine the number of stages required for complete extraction and stripping. (author)

  10. Coherent-potential approximation for the lattice vibrations of mixed III-V crystals

    International Nuclear Information System (INIS)

    Kleinert, P.

    1984-01-01

    The coherent-potential approximation (CPA) is applied to the lattice dynamics of some III-V mixed crystals. The calculations are based on an eleven-parameter rigid-ion model (RIM 11). Explicit results are reported for the one-mode system In/sub 1-c/Ga/sub c/P and the two mixed-mode crystals In/sub 1-c/Ga/sub c/Sb and GaSb/sub 1-c/As/sub c/. Both, the reflectivity spectra and the composition dependence of vibrations at the GAMMA and X points are compared with existing experimental data. Force-constant changes are considered by the virtual-crystal approximation (VCA). The CPA theory is uniquely successful for III-V mixed-mode systems, which appear to switch from one-mode to two-mode behaviour. (author)

  11. Importancia de los aspectos psicosociales en la enfermedad celíaca

    Directory of Open Access Journals (Sweden)

    Trini Fragoso Arbelo

    2002-06-01

    Full Text Available Se revisan los conceptos clínicos actuales sobre la enfermedad celíaca. Se definen con precisión los términos enfermedad celíaca activa, silente, latente y potencial. Se enfatiza en los aspectos psicosociales que influyen en su tratamiento y se trazan pautas generales acerca del manejo integral de los pacientes afectados, dada la importancia de la dieta sin gluten de por vida como único tratamiento.The current clinical concepts of celiac disease are reviewed. The terms active, silent, latent and potential related to celiac disease are accurately defined. Emphasis is made on the psychosocial aspects influencing its treatment and general guidelines are drawn on the comprehensive management of the patients suffering from this disease, given the importance of diet without gluten as the only lifelong treatment.

  12. The removal of toxic metals from liquid effluents by ion exchange resins. Part IV: Chromium(III)/H+ /Lewatit SP112

    International Nuclear Information System (INIS)

    Alguacil, F.J.

    2017-01-01

    This investigation presented results on the removal of chromium(III), from aqueous solution in the 0-5 pH range, using Lewatit SP112 cationic exchange resin. Several aspects affecting the ion exchange process were evaluated, including: the influence of the stirring speed, temperature, pH of the solution, resin dosage and aqueous ionic strength. The selectivity of the system was tested against the presence of other metals in the aqueous solution, whereas the removal of chromium(III) from solutions was compared with results obtained using multiwalled carbon nanotubes as adsorbents. From the batch experimental data, best fit of the results is obtained with the Langmuir model, whereas the ion exchange process is best explained by the pseudo-second order model, moreover, experimental data responded well to the film-diffusion controlled model. Elution of the chromium(III) loaded into the resin is well accomplished by the use of sodium hydroxide solutions. [es

  13. Hydration structure of Ti(III) and Cr(III): Monte Carlo simulation ...

    African Journals Online (AJOL)

    Classical Monte Carlo simulations were performed to investigate the solvation structures of Ti(III) and Cr(III) ions in water with only ion-water pair interaction potential and by including three-body correction terms. The hydration structures were evaluated in terms of radial distribution functions, coordination numbers and ...

  14. Photon-ion spectrometer PIPE at the Variable Polarization XUV Beamline of PETRA III

    International Nuclear Information System (INIS)

    Schippers, S; Ricz, S; Buhr, T; Hellhund, J; Müller, A; Klumpp, S; Martins, M; Flesch, R; Rühl, E; Lower, J; Jahnke, T; Metz, D; Schmidt, L Ph H; Dörner, R; Ullrich, J; Wolf, A

    2012-01-01

    The photon-ion spectrometer PIPE is currently being installed as a permanent end station at beamline P04 of the PETRA III synchrotron radiation source. Various state-of-the-art experimental techniques will be available for studies of gaseous matter with circularly and linearly polarized synchrotron radiation with photon energies in range the 100–3000 eV.

  15. Systematic theoretical investigation of the zero-field splitting in Gd(III) complexes: Wave function and density functional approaches

    Energy Technology Data Exchange (ETDEWEB)

    Khan, Shehryar, E-mail: sherkhan@fysik.su.se; Odelius, Michael, E-mail: odelius@fysik.su.se [Department of Physics, Stockholm University, AlbaNova University Center, S-106 91 Stockholm (Sweden); Kubica-Misztal, Aleksandra [Institute of Physics, Jagiellonian University, ul. Reymonta 4, PL-30-059 Krakow (Poland); Kruk, Danuta [Faculty of Mathematics and Computer Science, University of Warmia and Mazury in Olsztyn, Sloneczna 54, Olsztyn PL-10710 (Poland); Kowalewski, Jozef [Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, S-106 91 Stockholm (Sweden)

    2015-01-21

    The zero-field splitting (ZFS) of the electronic ground state in paramagnetic ions is a sensitive probe of the variations in the electronic and molecular structure with an impact on fields ranging from fundamental physical chemistry to medical applications. A detailed analysis of the ZFS in a series of symmetric Gd(III) complexes is presented in order to establish the applicability and accuracy of computational methods using multiconfigurational complete-active-space self-consistent field wave functions and of density functional theory calculations. The various computational schemes are then applied to larger complexes Gd(III)DOTA(H{sub 2}O){sup −}, Gd(III)DTPA(H{sub 2}O){sup 2−}, and Gd(III)(H{sub 2}O){sub 8}{sup 3+} in order to analyze how the theoretical results compare to experimentally derived parameters. In contrast to approximations based on density functional theory, the multiconfigurational methods produce results for the ZFS of Gd(III) complexes on the correct order of magnitude.

  16. Adsorption of Sr(II) and Eu(III) on Na-rectorite. Effect of pH, ionic strength, concentration and modelling

    Energy Technology Data Exchange (ETDEWEB)

    Hu, J.; Wang, X.K. [School of Nuclear Science and Engineering, North China Electric Power Univ., BJ (China); Key Lab. of Novel Thin Film Solar Cells, Inst. of Plasma Physics, Chinese Academy of Sciences, Hefei (China); Chen, C.L.; Sheng, G.D.; Li, J.X. [Key Lab. of Novel Thin Film Solar Cells, Inst. of Plasma Physics, Chinese Academy of Sciences, Hefei (China); Chen, Y.X. [School of Nuclear Science and Engineering, North China Electric Power Univ., BJ (China)

    2010-07-01

    The surface charge characteristics of Na-rectorite (NaAl{sub 4}[Si,Al]{sub 8}O{sub 20}(OH){sub 4}.nH{sub 2}O;) were studied by potentiometric acid-base titrations. Sr(II) and Eu(III) adsorptions on Na-rectorite as a function of pH, ionic strength, and Sr(II)/Eu(III) concentrations were carried out to investigate the surface interactions between Sr(II)/Eu(III) with Na-rectorite. The results indicated that the adsorptions of Sr(II) and Eu(III) on Na-rectorite increased with increasing pH and decreased with increasing ionic strength and initial Sr(II)/Eu(III) concentrations, and that the affinity of Na-rectorite for Eu(III) was much higher than for Sr(II). The experimental data of Sr(II)/Eu(III) adsorption were simulated by the diffuse-layer model (DLM) well with the aid of FITEQL 3.2. Simultaneous adsorptions of Sr(II) and Eu(III) on Na-rectorite were also modeled using the DLM. The adsorption mechanisms of Sr(II) and Eu(III) on Na-rectorite may be dominated by ion exchange interaction at low pH or moderate pH, and by surface complexation interaction at high pH. (orig.)

  17. Structural characterization of the Actinides (III) and (IV) - DOTA complexes

    International Nuclear Information System (INIS)

    Audras, Matthieu

    2014-01-01

    The polyamino-carboxylate anions have been identified as compounds of interest in the operations of actinide separation, in actinide migration in the environment and in human radio-toxicology. The structural characterization of complexes formed between actinides and polyamino-carboxylates ligands is essential for a better understanding of actinide-ligands interactions. Among the polyamino-carboxylate anions, the DOTA ligand (1,4,7,10-tetraaza-cyclododecane tetraacetic acid) is described as a very strong complexing agent of the lanthanides(III), but has been little studied with actinides. The objective of this thesis is to describe the complexes formed between the actinides (III) and (IV) and the DOTA ligand, and compare them with the lanthanide complexes. For this, an approach has been introduced to characterize the complexes by complementary analytical techniques (spectrophotometry, electro-spray ionization mass spectrometry, NMR, EXAFS, electrochemistry), but also by calculations of theoretical chemistry to help the interpretation of the experimental data. The formation of a 1:1 complex is observed with the actinides(III) (plutonium and americium) as for lanthanides(III): rapid formation of intermediate species which evolves slowly towards the formation of a limit complex. Within this complex, the cation is located inside the cavity formed by the ligand. Four nitrogen atoms and four oxygen atoms from the carboxylate functions are involved in the coordination sphere of the cation. However, differences were observed in the bond lengths formed between the cation and the nitrogen atoms (the bonds are somewhat shorter in the case of actinide complexes) as well as the complexation kinetics, which is slightly faster for the actinides(III) than for lanthanide(III) ions of equivalent radius. The same behavior was observed in solution upon complexation of actinides(IV) (uranium, plutonium and neptunium): slow formation of a 1:1 complex (actinide(IV):ligand) in wherein the

  18. Aspectos éticos e estratégias para a participação voluntária da criança em pesquisa Aspectos éticos y estrategias para la participación voluntaria de niños en la investigación Ethical issues and strategies for the voluntary participation of children in research

    Directory of Open Access Journals (Sweden)

    Cecília Helena de Siqueira Sigaud

    2009-12-01

    Full Text Available A literatura de saúde tem abordado os aspectos éticos da investigação com seres humanos há décadas, mas ainda há desafios a serem reconhecidos e superados, tais como os referentes à pesquisa com crianças. Este artigo apresenta e discute aspectos éticos da pesquisa com crianças. Descreve estratégias de abordagem conformes às necessidades infantis, segundo seu processo de desenvolvimento e características individuais, para garantir a participação voluntária da criança na pesquisa.La literatura de salud ha tratado de los aspectos éticos de la investigación con seres humanos hace décadas, pero aun hay retos que deben ser reconocidos y superados, tales como los referentes a la investigación con la población infantil. Este artículo presenta y discute aspectos éticos de la investigación con niños y niñas. Describe estrategias de abordaje adecuadas a las necesidades infantiles, según su proceso de desarrollo y características individuales, para garantizar la participación voluntaria de niños y niñas en investigaciones.Ethical issues about research with human beings have been addressed in health literature since decades. In spite of this, it is necessary to enhance actions to face many challenges, like the ones related to investigation of childhood. This paper presents and discusses ethical issues in research with children. It describes some strategies to perform with children, considering their developmental process and individual characteristics, in order to guarantee their voluntary participation in research.

  19. Extraction Separation of Am(III) and Eu(III) with Thermo-sensitive Gel introducing TPEN Derivatives

    International Nuclear Information System (INIS)

    Kenji Takeshita; Yoshio Nakano; Tatsuro Matsumura; Atsunori Mori

    2008-01-01

    A thermal-swing chromatographic process using a thermo-sensitive gel co-polymerized with NIPA (N-isopropyl-acrylamide) and TPPEN (N,N,N',N'-tetrakis(4-propenyl-oxy-2-pyridyl-methyl)ethylenediamine) was studied for the separation of Am(III) from Eu(III). First, the radiolysis of the TPPEN-NIPA gel was tested by the γ-ray irradiation and the α nuclide adsorption. The extraction separation of Am(III) was not influenced in the radioactive environment of the proposed process. Next, the TPPEN-NIPA gel was immobilized in porous silica particles and the applicability of the gel-immobilized silica to the proposed process was tested. Am(III) was extracted selectively in the gel-immobilized silica at 5 deg. C and the separation factor of Am(III) over Eu(III) was evaluated to be 3.7. The distribution ratio of Am(III) was reduced to less than 1/20 by increasing temperature from 5 deg. C to 40 deg. C. These results indicate that the TPPEN-NIPA gel is applicable to the thermal-swing chromatographic process for the minor actinide recovery. (authors)

  20. Kinetics and mechanism of RuIII catalysed oxidation of 1,2,3,4-tetrahydro-naphthalene (tetralin) by CeIV in aqueous nitric acid medium

    International Nuclear Information System (INIS)

    Vijaya Bhaskar Rao, N.; Anand Rao, M.

    2009-01-01

    The kinetics and mechanism of Ru III catalysed oxidation of 1,2,3,4-tetrahydronaphthalene (tetralin) by Ce IV in aqueous nitric acid to tetralone under the conditions (TL) > > (Ce IV ) at different temperatures (30-50 deg C) have been studied in 3.0 mol dm -3 nitric acid medium. The experimentally observed rate law conforms to -d(Ce IV )/dt = kK(Ce IV )(TL)(Ru III )/l + K(TL) + K(Ru III ). (author)

  1. Novel solid phase extraction procedure for gold(III) on Dowex M 4195 prior to its flame atomic absorption spectrometric determination

    Energy Technology Data Exchange (ETDEWEB)

    Tuzen, Mustafa [Gaziosmanpasa University, Faculty of Science and Arts, Chemistry Department, 60250 Tokat (Turkey)], E-mail: mtuzen@gop.edu.tr; Saygi, Kadriye O. [Gaziosmanpasa University, Faculty of Science and Arts, Chemistry Department, 60250 Tokat (Turkey); Soylak, Mustafa [Erciyes University, Faculty of Science and Arts, Chemistry Department, 38039 Kayseri (Turkey)

    2008-08-15

    A method for solid phase extraction (SPE) of gold(III) using Dowex M 4195 chelating resin has been developed. The optimum experimental conditions for the quantitative sorption of gold(III), pH, effect of flow rates, eluent types, sorption capacity and the effect of diverse ions on the sorption of gold(III) have been investigated. The chelating resin can be reused for more than 100 cycles of sorption-desorption without any significant change in sorption of gold(III) ions. The recovery values for gold(III) and detection limit (LOD) of gold were greater than 95% and 1.61 {mu}g L{sup -1}, respectively. The preconcentration factor was 31. The relative standard deviation of the method was <5%. The adsorption capacity of the resin was 8.1 mg g{sup -1}. The proposed method has been applied for the determination of gold(III) in some real samples including water, soil and sediment samples.

  2. Variation in plasmonic (electronic) spectral parameters of Pr (III) and Nd (III) with varied concentration of moderators

    Energy Technology Data Exchange (ETDEWEB)

    Mishra, Shubha, E-mail: shubhamishra03@gmail.com [School of Studies in Physics, Vikram University, Ujjain (M. P.) (India); Limaye, S. N., E-mail: snl222@yahoo.co.in [Department of Chemistry, Dr. H.S. Gour University, A Central University, Sagar (M.P.) (India)

    2015-07-31

    It is said that the -4f shells behave as core and are least perturbed by changes around metal ion surrounding. However, there are evidences that-4f shells partially involved in direct moderator interaction. A systematic investigation on the plasmonic (electronic) spectral studies of some Rare Earths[RE(III).Mod] where, RE(III) = Pr(III),Nd(III) and Mod(moderator) = Y(III),La(III),Gd(III) and Lu(III), increased moderator concentration from 0.01 mol dm{sup −3} to 0.025 mol dm{sup −3} keeping the metal ion concentration at 0.01mol dm{sup −3} have been carried out. Variations in oscillator strengths (f), Judd-Ofelt parameters (T{sub λ}),inter-electronic repulsion Racah parameters (δE{sup k}),nephelauxetic ratio (β), radiative parameters (S{sub ED},A{sub T},β{sub R},T{sub R}). The values of oscillator strengths and Judd-Ofelt parameters have been discussed in the light of coordination number of RE(III) metal ions, denticity and basicity of the moderators. The [RE(III).Mod] bonding pattern has been studies in the light of the change in Racah parameters and nephelauxetic ratio.

  3. Purification of chicken carbonic anhydrase isozyme-III (CA-III and its measurement in White Leghorn chickens

    Directory of Open Access Journals (Sweden)

    Nishita Toshiho

    2011-11-01

    Full Text Available Abstract Background The developmental profile of chicken carbonic anhydrase-III (CA-III blood levels has not been previously determined or reported. We isolated CA-III from chicken muscle and investigated age-related changes in the levels of CA-III in blood. Methods CA-III was purified from chicken muscle. The levels of CA-III in plasma and erythrocytes from 278 female chickens (aged 1-93 weeks and 68 male chickens (aged 3-59 weeks were determined by ELISA. Results The mean level of CA-III in female chicken erythrocytes (1 week old was 4.6 μg/g of Hb, and the CA-III level did not change until 16 weeks of age. The level then increased until 63 weeks of age (11.8 μg/g of Hb, decreased to 4.7 μg/g of Hb at 73 weeks of age, and increased again until 93 weeks of age (8.6 μg/g of Hb. The mean level of CA-III in erythrocytes from male chickens (3 weeks old was 2.4 μg/g of Hb, and this level remained steady until 59 weeks of age. The mean plasma level of CA-III in 1-week-old female chickens was 60 ng/mL, and this level was increased at 3 weeks of age (141 ng/mL and then remained steady until 80 weeks of age (122 ng/mL. The mean plasma level of CA-III in 3-week-old male chickens was 58 ng/mL, and this level remained steady until 59 weeks of age. Conclusion We observed both developmental changes and sex differences in CA-III concentrations in White Leghorn (WL chicken erythrocytes and plasma. Simple linear regression analysis showed a significant association between the erythrocyte CA-III level and egg-laying rate in WL-chickens 16-63 weeks of age (p

  4. Tres reformas educativas europeas: Reino Unido, Francia y España: aspectos comparativos.

    Directory of Open Access Journals (Sweden)

    Inmaculada Egido Gálvez

    1997-01-01

    Full Text Available Desde una perspectiva unicamente aproximativa, este trabajo lleva a cabo un breve repaso de las reforrnas realizadas en los ultimos afios en el sistema educativo de tres paises europeos: Reino Unido, Francia y Espana. Tras la consideracion de los principales cambios introducidos por las leyes de reforma en relaci6n con la estructura del sistema, el curriculum, el profesorado y el gobiemo y la administraci6n de la educacion, se presenta lavaloraci6n crftica de algunos de los aspectos mas relevantes de las reformas. Por ultimo, se realizan algunas reflexiones globales derivadas de la comparaci6n entre los tres casos tratados

  5. Equilibrio liquido-liquido-vapor de misturas ternarias : algoritimo de calculo e aspectos termodinamicos

    OpenAIRE

    Maria Helena Cano de Andrade

    1991-01-01

    Resumo: Este trabalho é uma contribuição ao estudo de processos de separação envolvendo fases em equilibrio liquido-liquido-vapor. Os seguintes aspectos são abordados: (1) desenvolvimento de um algoritmo eficiente de cálculo de flash liquido-liquido-vapor e sua aplicação para gerar diagramas de fases e em cálculos de destilação; (2) avaliação da utilização de parâmetros binários do modelo UNIQUAC obtidos de dados bifásicos em cálculos trifásicos de misturas ternárias; (3) medidas experimentai...

  6. Recirculation pump suction line 2.8% break integral test at ROSA-III with HPCS failure, RUN 984

    International Nuclear Information System (INIS)

    Suzuki, Mitsuhiro; Anoda, Yoshinari; Tasaka, Kanji; Kumamaru, Hiroshige; Nakamura, Hideo; Yonomoto, Taisuke; Murata, Hideo; Shiba, Masayoshi

    1984-06-01

    This report presents the experimental data of 2.8% suction line break test RUN 984 at ROSA-III, which was conducted as one of counterpart tests to FIST program sponsored by GE, EPRI and USNRC. The similarity study between the ROSA-III and FIST tests is on the way. The report also presents the information on the ROSA-III test facility, experiment results and the effects of the ADS flow rate and the MSIV trip level comparing with the previously conducted ROSA-III small break tests, RUNs 920 and 922. Major conclusions obtained are as follows. (1) Change of the MSIV trip level from L2 to L1 gives delay of MSIV closure and longer actuation of pressure control system in a small break LOCA. (2) Larger ADS flow gives faster depressurization rate and earlier ECCS actuation, which results in shorter fuel rod dryout period and lower PCT. (author)

  7. Reductive immobilization of U(VI) in Fe(III) oxide-reducing subsurface sediments: Analysis of coupled microbial-geochemical processes in experimental reactive transport systems. Final Scientific/Technical Report-EMSP 73914

    International Nuclear Information System (INIS)

    Eric E. Roden Matilde M. Urrutia Mark O. Barnett Clifford R. Lange

    2005-01-01

    (VI) reduction is likely to be less efficient in natural soils and sediments than would be inferred from studies with synthetic Fe(III) oxides. A key implication of these findings is that production of Fe(II)-enriched sediments during one-time (or periodic) stimulation of DMRB activity is not likely to permit efficient long-term abiotic conversion of U(VI) to U(IV) in biogenic redox barriers designed to prevent far-field subsurface U(VI) migration. Instead our results suggest that ongoing DMRB activity will be required to achieve maximal U(VI) reduction efficiency, and emphasize the need for detailed understanding of patterns of DMRB growth, colonization, and maintenance in physically and chemically heterogeneous subsurface environments in order to predict the effectiveness of subsurface U(VI) bioremediation operations. A final ''capstone'' aspect of experimental work on the project was to examine the potential for sustained coupled Fe(III) oxide and U(VI) reduction in experimental flow-through reactor systems (i.e. sediment columns and ''semicontinuous culture'' systems) that are conceptually analogous to hydrologically-open subsurface environments. The results conclusively demonstrated the potential for sustained removal of U(VI) from solution via DMRB activity in excess of the U(VI) sorption capacity of the natural mineral assemblages as determined in abiotic controls. In addition, the abundance of sorbed U(VI) (a potential long-term source of U(VI) to the aqueous phase) was much lower in the biotic vs. abiotic systems. The latter results agree with other project findings which demonstrated the capacity for G. sulfurreducens to reduce sorbed U(VI). Throughout the project we have developed and refined a variety of reaction-based models of coupled Fe(III) oxide/U(VI) reduction, including a generalized model which accounts for the population dynamics of various respiratory microbial functional groups. These models have been employed in numerical simulations of both batch bench

  8. VIABILIDADE ECONÔMICA DE PROJETOS E ASPECTOS PARTICULARES EM EMPREENDIMENTOS TIPO PROJECT FINANCE APLICADOS A INVESTIMENTOS MEDIANTE PARCERIA PÚBLICO-PRIVADA EM INFRAESTRUTURA DE TRANSPORTES

    Directory of Open Access Journals (Sweden)

    Alexandre da Costa Pereira

    2013-01-01

    Full Text Available O artigo tem por objetivo destacar aspectos relacionados com a análise da viabilidade de projetos de infraestrutura de transportes, aplicados a estudos de ampliação de capacidade de sistemas de transporte, sendo destacado no trabalho o aspecto da relevante importância da participação da iniciativa privada como parceira nos investimentos em infraestrutura. São abordados os métodos e estudos de viabilidade técnica e econômica, empréstimos, financiamentos e aspectos particulares a estudos para avaliação de projetos na área de infraestrutura de transportes. Como método para a avaliação de viabilidade financeira de projetos de concessões em investimentos em infraestrutura foi escolhido o Project Finance, tanto por seu potencial para a obtenção de parâmetros fundamentais para a tomada de decisão sobre alternativas de investimento, notadamente em projetos que considerem a participação privada como importante na viabilização do projeto, como para a análise de fatores intervenientes no risco de um investimento em obras de infraestrutura de transportes.

  9. Transtornos alimentares: o papel dos aspectos culturais no mundo contemporâneo Transtornos alimentarios: el papel de los aspectos culturales en el mundo contemporáneo Eating disorders: the role of cultural aspects in the contemporary world

    Directory of Open Access Journals (Sweden)

    Leticia Langlois Oliveira

    2010-09-01

    Full Text Available Os transtornos alimentares são patologias caracterizadas primordialmente pelo medo mórbido de engordar. Vários são os fatores envolvidos tanto na etiologia quanto na manutenção e na gravidade dessas doenças, principalmente fatores individuais, familiares e culturais. Em relação a estes últimos, salienta-se o papel dos aspectos históricos, estéticos, midiáticos, transculturais, socioeconômicos, raciais e de gênero. Pesquisas atuais realizadas em diversas culturas demonstram a existência de uma relação entre esses fatores e os índices de anorexia nervosa e bulimia nervosa. A busca por um padrão estético globalizado (magreza, segundo a literatura, tem um papel central no aumento do número de casos. O objetivo deste artigo é apresentar uma discussão teórica acerca dos aspectos culturais envolvidos no aumento do número de casos de transtornos alimentares. Este trabalho pretende também destacar a necessidade de que profissionais de diversas áreas estejam atentos para os perigos do padrão de beleza atual, a fim de potencializar intervenções preventivas.Los transtornos alimentarios son patologías caracterizadas primordialmente por el miedo mórbido de engordar. Varios son los factores involucrados ya sea en la etiología cuanto en la manutención y en la gravedad de esas enfermidades: individuales, familiares y culturales. Con relación a esos últimos, se resalta el papel de los aspectos históricos, estéticos, midiáticos, transculturales, socio económicos, raciales y de género. Investigaciones actuales realizadas en diferentes culturas muestran la existencia de una relación entre esos factores y los índices de anorexia nervosa y bulimia nervosa. El objetivo de ese artículo es presentar una discusión a cerca de los aspectos culturales involucrados en el aumento del número de casos de transtornos alimentarios. Ese trabajo pretende también destacar la necesidad de que profesionistas de diversas áreas estean

  10. Redox equilibria in the In(III)-In(I)-In system in aqueous KBr solutions, I. potentiometric and coulometric study

    International Nuclear Information System (INIS)

    Malyszko, E.; Malyszko, J.

    1993-01-01

    The reproportionation of In(I) ions in acidic potassium bromide solutions was studied by means of the coulometric and potentiometric method. The formal potentials of the In(III)/In(I), In(III)/In and In(I)/In redox couples as well as the equilibrium constants of the reaction In(III) + 2 In 3 In(I) were determined at a background electrolyte concentration ranging from 1 to 4 mol dm -3 . Based on the experimental results, a scheme of the reproportionation reaction was proposed with regard to the participation of bromide ions. In addition, the diffusion coefficient of In(I) ions was determined using the chronopotentiometric technique

  11. Aspectos socioeconómicos y familiares asociados en niños y adolescentes obesos

    Directory of Open Access Journals (Sweden)

    William José González Cabriles

    2013-01-01

    Full Text Available El estudio es transversal y correlacional donde se analizaron las variables socioeconómicas y familiares de una muestra no probabilística, constituida por 528 familias de niños con obesidad exógena, de 2 a 18 años, provenientes de diversos sectores del país, atendidos en la consulta de primera del Centro de Atención Nutricional Infantil Antímano. El objetivo fue determinar los aspectos socioeconómicos y familiares asociados en niños y adolescentes con obesidad que asistieron al Centro. Los datos se procesaron con el programa SPSS 9.0. Se analizaron las distribuciones de frecuencias y el estadístico Chi-cuadrado para probar asociación entre las variables. El nivel de significancia fue 95%. En las familias de niños obesos se encontró que la mayoría de los jefes de familia eran obesos; las familias con pobreza extrema y la población infantil mayor de 15 años presentaron mayor sedentarismo; por último, las madres en general no participaron en la toma de decisiones en la compra de alimentos y no poseían nociones de alimentación equilibrada que les permitieran planificar la compra de alimentos. Estos aspectos se erigen como claves para ser abordados y resueltos por el trabajador social durante la intervención con el fin de favorecer la recuperación nutricional del niño obeso y su familia.

  12. Recent operational history of the new Sandia Pulsed Reactor III (SPR III)

    International Nuclear Information System (INIS)

    Schmidt, T.R.; Estes, B.F.; Reuscher, J.A.

    1977-01-01

    The Sandia Pulsed Reactor III (SPR III) is a fast-pulse research reactor which was designed and built at Sandia Laboratories and achieved criticality in August 1975. The reactor is now characterized and is in an operational configuration. The core consists of 18 fuel plates (258 kg fuel mass) of fully enriched uranium alloyed with 10 wt.% molybdenum. It is arranged in an annular configuration with an inside diameter of 17.78 cm, an outside diameter of 29.72 cm, and a height of 35.9 cm. The reactor core uses reflectors of copper and aluminum for control and an external bolting arrangement to secure the fuel plates. SPR III and SPR II are operated on an interchangeable basis using the same facility and control system. As of June 1977, SPR III has had over 240 operations with core temperatures up to 541 0 C

  13. Effect of Ligand Substitution around the Dy(III) on the SMM Properties of Dual-Luminescent Zn-Dy and Zn-Dy-Zn Complexes with Large Anisotropy Energy Barriers: A Combined Theoretical and Experimental Magnetostructural Study.

    Science.gov (United States)

    Costes, Jean Pierre; Titos-Padilla, Silvia; Oyarzabal, Itziar; Gupta, Tulika; Duhayon, Carine; Rajaraman, Gopalan; Colacio, Enrique

    2016-05-02

    The new dinuclear Zn(II)-Dy(III) and trinuclear Zn(II)-Dy(III)-Zn(II) complexes of formula [(LZnBrDy(ovan) (NO3)(H2O)](H2O)·0.5(MeOH) (1) and [(L(1)ZnBr)2Dy(MeOH)2](ClO4) (3) (L and L(1) are the dideprotonated forms of the N,N'-2,2-dimethylpropylenedi(3-methoxysalicylideneiminato and 2-{(E)-[(3-{[(2E,3E)-3-(hydroxyimino)butan-2-ylidene ]amino}-2,2-dimethylpropyl)imino]methyl}-6-methoxyphenol Schiff base compartmental ligands, respectively) have been prepared and magnetostructurally characterized. The X-ray structure of 1 indicates that the Dy(III) ion exhibits a DyO9 coordination sphere, which is made from four O atoms coming from the compartmental ligand (two methoxy terminal groups and two phenoxido bridging groups connecting Zn(II) and Dy(III) ions), other four atoms belonging to the chelating nitrato and ovanillin ligands, and the last one coming to the coordinated water molecule. The structure of 3 shows the central Dy(III) ion surrounded by two L(1)Zn units, so that the Dy(III) and Zn(II) ions are linked by phenoxido/oximato bridging groups. The Dy ion is eight-coordinated by the six O atoms afforded by two L(1) ligands and two O atoms coming from two methanol molecules. Alternating current (AC) dynamic magnetic measurements of 1, 3, and the previously reported dinuclear [LZnClDy(thd)2] (2) complex (where thd = 2,2,6,6-tetramethyl-3,5-heptanedionato ligand) indicate single molecule magnet (SMM) behavior for all these complexes with large thermal energy barriers for the reversal of the magnetization and butterfly-shaped hysteresis loops at 2 K. Ab initio calculations on 1-3 show a pure Ising ground state for all of them, which induces almost completely suppressed quantum tunnelling magnetization (QTM), and thermally assisted quantum tunnelling magnetization (TA-QTM) relaxations via the first excited Kramers doublet, leading to large energy barriers, thus supporting the observation of SMM behavior. The comparison between the experimental and theoretical

  14. Characterization of ribonuclease III from Brucella.

    Science.gov (United States)

    Wu, Chang-Xian; Xu, Xian-Jin; Zheng, Ke; Liu, Fang; Yang, Xu-Dong; Chen, Chuang-Fu; Chen, Huan-Chun; Liu, Zheng-Fei

    2016-04-01

    Bacterial ribonuclease III (RNase III) is a highly conserved endonuclease, which plays pivotal roles in RNA maturation and decay pathways by cleaving double-stranded structure of RNAs. Here we cloned rncS gene from the genomic DNA of Brucella melitensis, and analyzed the cleavage properties of RNase III from Brucella. We identified Brucella-encoding small RNA (sRNA) by high-throughput sequencing and northern blot, and found that sRNA of Brucella and Homo miRNA precursor (pre-miRNA) can be bound and cleaved by B.melitensis ribonuclease III (Bm-RNase III). Cleavage activity of Bm-RNase III is bivalent metal cations- and alkaline buffer-dependent. We constructed several point mutations in Bm-RNase III, whose cleavage activity indicated that the 133th Glutamic acid residue was required for catalytic activity. Western blot revealed that Bm-RNase III was differently expressed in Brucella virulence strain 027 and vaccine strain M5-90. Collectively, our data suggest that Brucella RNase III can efficiently bind and cleave stem-loop structure of small RNA, and might participate in regulation of virulence in Brucella. Copyright © 2016 Elsevier B.V. All rights reserved.

  15. Aspectos psicológicos en el cáncer ginecológico

    Directory of Open Access Journals (Sweden)

    María Eugenia Olivares Crespo

    2004-01-01

    Full Text Available En el presente trabajo se abordan los aspectos psicológicos concomitantes a la patologíaoncológica ginecológica. De forma habitual estas pacientes están sometidas a diferentes modalidadesterapéuticas que provocan efectos acumulativos. En términos generales, el tratamiento deelección es quirúrgico, principalmente mastectomía e histerectomía. Estos tratamientos quirúrgicosprovocan efectos antes, durante y después de los mismos. Entre los que cabe citar: alteraciones sexuales, cambios en la imagen corporal, infertilidad y menopausia inducida. Para concluir, seespecifican los procedimientos terapéuticos psicológicos del proceso, tanto del diagnóstico como deltratamiento quirúrgico y de los efectos derivados del mismo.

  16. Aspectos do Desenvolvimento Político e Econômico da Guyana

    Directory of Open Access Journals (Sweden)

    Iuri Cavlak

    2014-07-01

    Full Text Available Este artigo visa analisar alguns aspectos do desenvolvimento político e econômico da Guyana, pequeno país sul-americano situado no extremo norte do subcontinente. Tendo seu passado ligado a Holanda e a Inglaterra, a Guyana só conquistou sua independência em 1966, num contexto de avanço dos movimentos sociais, empolgados na construção de uma nova nação, e oposição dos Estados Unidos, tentando frear a difusão das ideias socialistas e o apego da política externa guianense ao bloco soviético. A busca por uma economia nacionalizada e planejada foi constante, embora com resultados deveras aquém do esperado.

  17. Advances in experimental seismic engineering

    International Nuclear Information System (INIS)

    Muthumani, K.; Gopalakrishnan, N.; Sathish Kumar, K.; Iyer, Nagesh R.

    2011-01-01

    Seismic testing plays a key role in better understanding physical phenomena, validating and improving analysis and design methods, and qualifying sensitive equipment. There are several different experimental techniques that can be used to test the response of structures to verify their seismic performance. These include (i) Quasi-static testing (ii) Shake table testing, (iii) Effective force testing (iv) Pseudodynamic testing and (v) Real-time dynamic hybrid testing. The sophisticated shaking table facilities and modern data acquisition and processing methods using high speed computers have made it possible to improve the accuracy and reliability of the experimental data, and to increase the number of gauge points, thus yielding a more detailed picture of the structural behavior. Lifeline structures like nuclear power plants and thermal power

  18. Aspectos genéticos del procesamiento de antígenos intracelulares

    Directory of Open Access Journals (Sweden)

    Beatriz Martínez

    1993-03-01

    Full Text Available La activación de los linfocitos T (LT, un aspecto fundamental en la generación de la respuesta inmune (RI, se produce mediante el contacto de sus receptores antigénicos (TCR con un complejo formado por un péptido derivado del antígeno y una molécula del complejo mayor de Histocompatibilidad (MHC, HLA en el humano sobre la superficie de una célula presentadora de antígenos (APC. El origen del péptido puede ser exógenooextracelular, como sucede con la mayoría de los antígenos presentados por las moléculas MHC clase II, o endógeno (intracelular, como es el caso de las proteínas virales. sintetizadas por la célula y presentadas por las moléculas MHC Clase.

  19. Um aspecto da diversidade cultural do caboclo amazônico: a religião

    OpenAIRE

    Maués, Raymundo Heraldo

    2005-01-01

    ESTE TRABALHO trata de um aspecto da diversidade cultural do caboclo amazônico, isto é, a religião. Esta se constitui numa espécie de catolicismo popular, que mantém relações com o xamanismo nativo - a pajelança cabocla -, e que se originou de antigas práticas e crenças dos índios Tupinambás, que habitaram parte da região amazônica no período colonial, bem como de influências portuguesas e africanas.HIS PAPER deals with a particular aspect of the Amazon caboclo's cultural diversity, namely, r...

  20. Aspectos psicosociales en el embarazo en mujeres menores de edad en España

    OpenAIRE

    Ibáñez Blanco, Raquel

    2015-01-01

    Me decidí a realizar mi Trabajo de Fin de Grado sobre los aspectos fisiológicos y emocionales en mujeres menores de edad porque considero que la gestación es uno de los momentos claves en la vida de cualquier mujer. Esta situación se ve llevada al extremo cuando tiene lugar en una menor de edad. Aunque en principio pueda parecer algo lejano y puntual, podremos comprobar que es una situación más habitual de lo que esperamos. Además de los importantes cambios anatómicos y fisiológicos que se pr...

  1. Antithrombin III blood test

    Science.gov (United States)

    ... medlineplus.gov/ency/article/003661.htm Antithrombin III blood test To use the sharing features on this page, ... a protein that helps control blood clotting. A blood test can determine the amount of AT III present ...

  2. Increases In Plasma Urea And Creatinine In Experimental ...

    African Journals Online (AJOL)

    Alterations in both plasma urea and creatinine levels were monitored over a period of twenty eight (28) days in experimentally infected rabbits. A total of 15 animals were randomly divided into three groups of n=5. The groups were control (group I), infected and treated (group II) and infected but untreated (group III) ...

  3. EXPERIMENTAL RESULTS OF THE NEPHELINE PHASE III STUDY

    Energy Technology Data Exchange (ETDEWEB)

    Fox, K.; Edwards, T.

    2009-11-09

    This study is the third phase in a series of experiments designed to reduce conservatism in the model that predicts the formation of nepheline, a crystalline phase that can reduce the durability of high level waste glass. A Phase I study developed a series of glass compositions that were very durable while their nepheline discriminator values were well below the current nepheline discriminator limit of 0.62, where nepheline is predicted to crystallize upon slow cooling. A Phase II study selected glass compositions to identify any linear effects of composition on nepheline crystallization and that were restricted to regions that fell within the validation ranges of the Defense Waste Processing Facility (DWPF) Product Composition Control System (PCCS) models. However, it was not possible to identify any linear effects of composition on chemical durability performance for this set of study glasses. The results of the Phase II study alone were not sufficient to recommend modification of the current nepheline discriminator. It was recommended that the next series of experiments continue to focus not only on compositional regions where the PCCS models are considered applicable (i.e., the model validation ranges), but also be restricted to compositional regions where the only constraint limiting processing is the current nepheline discriminator. Two methods were used in selecting glasses for this Phase III nepheline study. The first was based on the relationship of the current nepheline discriminator model to the other DWPF PCCS models, and the second was based on theory of crystallization in mineral and glass melts. A series of 29 test glass compositions was selected for this study using a combination of the two approaches. The glasses were fabricated and characterized in the laboratory. After reviewing the data, the study glasses generally met the target compositions with little issue. Product Consistency Test results correlated well with the crystallization analyses in

  4. Complexation and molecular modeling studies of europium(III)-gallic acid-amino acid complexes.

    Science.gov (United States)

    Taha, Mohamed; Khan, Imran; Coutinho, João A P

    2016-04-01

    With many metal-based drugs extensively used today in the treatment of cancer, attention has focused on the development of new coordination compounds with antitumor activity with europium(III) complexes recently introduced as novel anticancer drugs. The aim of this work is to design new Eu(III) complexes with gallic acid, an antioxida'nt phenolic compound. Gallic acid was chosen because it shows anticancer activity without harming health cells. As antioxidant, it helps to protect human cells against oxidative damage that implicated in DNA damage, cancer, and accelerated cell aging. In this work, the formation of binary and ternary complexes of Eu(III) with gallic acid, primary ligand, and amino acids alanine, leucine, isoleucine, and tryptophan was studied by glass electrode potentiometry in aqueous solution containing 0.1M NaNO3 at (298.2 ± 0.1) K. Their overall stability constants were evaluated and the concentration distributions of the complex species in solution were calculated. The protonation constants of gallic acid and amino acids were also determined at our experimental conditions and compared with those predicted by using conductor-like screening model for realistic solvation (COSMO-RS) model. The geometries of Eu(III)-gallic acid complexes were characterized by the density functional theory (DFT). The spectroscopic UV-visible and photoluminescence measurements are carried out to confirm the formation of Eu(III)-gallic acid complexes in aqueous solutions. Copyright © 2016 Elsevier Inc. All rights reserved.

  5. Investigation of the separation of americium(III) and europium(III) by high-speed countercurrent chromatography

    International Nuclear Information System (INIS)

    Wu, J.F.; Jin, Y.R.; Xu, Q.C.; Wang, S.L.; Zhang, L.X.

    2005-01-01

    The long-lived actinides are the important elements in the radioactive waste ;disposal. Because the ions semi diameter and chemical properties of trivalent actinides(III) and trivalent lanthanides(III) are very similar, the separation between them is very difficult. Yang Yu-Sheng put forward the actinides(III) are softer acid than the lanthanides(III), so the actinides(III) are more easily extracted by the soft extractant contain sulfur or nitrogen than the lanthanides(III). Some research have been done on the separation between actinides(III) and lanthanides(III) using the extractants contain sulfur or nitrogen. The results show that satisfactory separation efficiency was gained. Countercurrent Chromatography (CCC) have many specific advantages, such as free from solid support, permit large sample volume and high flow rate, which is useful in the preconcentration of inorganic solute and inorganic preparation. Some studies were done on the separation of lanthanides or-other inorganic elements by HSCCC, the high-purity reagents prepared by HSCCC or CPC turned out to be successful. In present paper, the investigation of separation between Americium (III) and Euricium (III) by High-Speed Countercurrent Chromatography (HSCCC) were made. The extractant used in the work was prepared by ourselves, which is of the soft extractant contrain sulfur. The effects of separation condition on the separation efficiency of Am and Eu by HSCCC were investigated using dichlorophenyl dithiophosphinic acid in xylene as the stationary phase and 0.1 mol/L NaClO4 as mobile phase, respectively. The results show that mutual separation between Am and Eu can be accomplished. The separation factor increases with the increasing of the concentration of extractant and the pH value of the mobile phase, further more, minishing the flow rate of the mobile phase can also improves the separation efficiency between Am and Eu. The nearly base separation was gained when the flow rate is 0.35 ml/min, the

  6. Articulación de fones en individuos clase esqueletal I,II y III Speech patterns in skeletal class I, II and III subjects

    Directory of Open Access Journals (Sweden)

    Pía Villanueva

    2009-09-01

    Full Text Available OBJETIVO: determinar los patrones de articulación de fones consonánticos en sujetos de habla española chilena clases I, II y III esqueletal; comparar las diferencias fonéticas que existan entre clases esqueletales. MÉTODOS: se seleccionaron 54 individuos que cumplían con los criterios de inclusión determinados mediante un examen clínico intraoral y a través del análisis de Ricketts, y se conformaron los grupos de estudio de pacientes clases esqueletales I, II y III. Se les realizó un examen fonoarticulatorio estandarizado para determinar los fones modificados y el patrón articulatorio compensatorio realizado. RESULTADOS: se observaron cambios en el punto de articulación de fones consonánticos en las tres clases esqueletales, con diferencias significativas en los grupos de fones anteriores y medios entre pacientes clases I y II, sólo en el grupo de los fones anteriores entre pacientes I y III. Entre pacientes clases II y III no se observaron diferencias significativas. Se reportan modificaciones y compensaciones cualitativamente distintas entre las clases esqueletales. CONCLUSIONES: en relación a pacientes clase I, los pacientes clase II o III, presentan distinto grado de modificación en el punto de articulación de fones consonánticos. Las diferencias observadas se relacionan con los patrones esqueletales propios de cada clase.PURPOSE: to determine the consonant phonemes articulation patterns in Chilean skeletal class I, II and III Spanish speakers and compare their phonetic differences. METHODS: fifty-four skeletal class I, II and III subjects were selected, based on intraoral clinical examination and Ricketts cephalometric analysis, constituting the study groups. A standardized phonoarticulatory test was applied to each patient to determine the modified phonemes and their compensatory patterns. RESULTS: the findings indicate changes in articulation in all three groups. Significant differences were found in anterior and medium

  7. Aspectos éticos en la investigación cualitativa con niños

    Directory of Open Access Journals (Sweden)

    Luisa Fernanda Moscoso Loaiza

    2018-01-01

    Full Text Available La incorporación de los niños como participantes de estudios investigativos es una práctica más frecuente en la actualidad debido a la necesidad de conocer y entender su visión acerca de las experiencias de vida, lo que plantea nuevos retos y responsabilidades que se centran principalmente en las consideraciones éticas y metodológicas de la investigación. Este artículo describe los aspectos éticos que deben ser tenidos en cuenta en la investigación cualitativa con niños. Es un artículo de revisión con búsqueda sistemática en bases de datos, incluyendo artículos científicos, libros y literatura gris. Asimismo, se abordan las consideraciones éticas que se encuentran implicadas desde la vinculación de los niños como participantes, hasta la obtención de la información y la socialización de los resultados. Para la investigación se seleccionó la información relevante en torno a ocho temas conforme al proceso investigativo. Con esto se evidenció que la cuestión ética constituye un aspecto central en el momento de iniciar y desarrollar cualquier estudio investigativo, por lo que está presente desde su planteamiento hasta su finalización. Pudo concluirse que el cumplimiento de los criterios de rigor metodológico, como la dependencia, credibilidad, transferibilidad y confirmación, asegura la calidad de la investigación cualitativa con niños, y esto permite la adecuada aplicación de los principios éticos de beneficencia y no maleficencia, justicia, autonomía y confidencialidad.

  8. Atores profissionais e estudantes de teatro: aspectos vocais relacionados à prática

    Directory of Open Access Journals (Sweden)

    Juliana Richinitti Vilanova

    Full Text Available RESUMO Objetivo: identificar e comparar, em atores profissionais e estudantes de teatro, os aspectos relacionados à prática profissional, ao uso profissional da voz, hábitos e cuidados vocais, hábitos de saúde e condições ambientais no trabalho. Métodos: participaram 60 sujeitos de ambos os sexos, subdivididos em 2 grupos: Grupo Profissional - atores profissionais de teatro e Grupo Alunos - alunos de teatro sem experiência profissional teatral. Ambos os grupos responderam a um questionário que abordou aspectos relacionados à prática profissional, à voz, hábitos vocais, de saúde, condições ambientais e cuidados vocais. Resultados: os indivíduos do Grupo Profissional apresentaram maior ocorrência de rouquidão; maior ocorrência dos hábitos de usar a voz profissional quando está gripado, em posturas corporais e com respiração inadequadas, gritar, e permanecer em local com mofo ou pouca ventilação, fechado e empoeirado, e realizar ensaio em local diferente do local do espetáculo. O hábito de saúde de ingerir bebidas geladas foi maior no Grupo Alunos. O número de sujeitos que não possuem dificuldade em cena e que realizam aquecimento vocal é significantemente maior no Grupo Profissional. O tipo de aquecimento realizado significantemente mais pelo Grupo Profissional foi som de "s", respiração costo-diafragmática, som basal e vogais. Conclusão: constatou-se que ambos os grupos realizam hábitos prejudiciais e estão expostos a ambiente de trabalho inadequado para saúde vocal. Estes dados apontam a necessidade de ações de saúde vocal, a fim de minimizar o risco de alterações vocais nos profissionais e preparar os estudantes para o aumento da demanda vocal.

  9. Aspectos disautonômicos da porfiria aguda intermitente: a propósito de seis casos

    Directory of Open Access Journals (Sweden)

    Charles P. Tilbery

    1979-06-01

    Full Text Available Foram estudados seis casos de porfiria aguda intermitente, sendo enfocados os aspectos disautonômicos apresentados durante a longa permanência hospitalar dos doentes (média de 64 dias. Foram observados taquicardia sinusal e hipertensão arterial (4 casos, parada cardíaca (3 casos e depressão respiratória (5 casos. Os autores tecem comentários a propósito da fisiopatologia destas alterações e chamam a atenção sobre o prognóstico sombrio da porfiria aguda intermitente.

  10. Algunos aspectos de la Reforma al Código de Procedimiento Laboral (Ley 712 de 2001

    Directory of Open Access Journals (Sweden)

    Armando Rojas

    2002-01-01

    Full Text Available El pasado 9 de junio entró en vigencia la ley 712 del 2001, ley quereformó algunos aspectos del código procesal del trabajo que ahora sellama código procesal del trabajo y de la seguridad social. La razón desu creación obedeció a la necesidad de actualizar un estatuto procesal demás de cincuenta años a la práctica procesal de la actualidad, necesitadade la urgente descongestión de los procesos en los despachos judiciales

  11. Aspects of resistance to experimental infection with Trypanosoma cruzi; Aspectos da resistencia a infecao experimental com Trypanosoma cruzi

    Energy Technology Data Exchange (ETDEWEB)

    Dias, Viviane Liotti

    2010-07-01

    Chagas disease, a zoonosis caused by the protozoan Trypanosoma cruzi, has a wide distribution in Latin America and extends from the southern part of the United States to Argentina. A number of 10 million of infected people is estimated and another 25 million exposed to the risk. Although discovered over a century, Chagas disease is still a serious infection that causes great socioeconomic impact, with no effective treatment at the chronic phase and in which, a lack of scientific knowledge can be observed. The main goal of this work was that obtaining and using consomic strain of mice, the resistance could be investigated. Consomic strains were produced by programmed mating, in which the animals were monitored with DNA polymorphic markers, and one of his chromosomes was replaced by his homologue from another strain. As parental, were used, the inbred strains C57BL/6/J Unib with resistant phenotype (donor) and as receiver, the A/JUnib strain, that has a susceptible phenotype. These models were used to produce five consomic strains: for the chromosomes 7 (CSs7), 11 (CSs11), 14 (CSs14), 17 (CSs17) and 19 (CSs19), described by Passos et al. (2003) as important in controlling infection caused by the Y strain of T. cruzi. In experimental testing, the consomics were inoculated intraperitoneally at doses of 10{sup 1}, 10{sup 2}, 10{sup 3} and 10{sup 4} using as control, animals from both parental lines. In all consomics, resistance was higher than that observed in the susceptible parental. In a second protocol, the consomics were mated with scheduled associations and the progenies were challenged with inocula employing increasing doses of trypomastigotes. The resistance observed in this group was also higher than that observed in the parental with susceptible phenotype. The observed results demonstrate that the use of the consomic strains that were produced order to assess the contribution of each chromosome in the resistance, as well as the effects of association between

  12. Formation constants of lanthanide(III)- aminopolycarboxylate- ATP mixed ligand complexes and their systematics

    International Nuclear Information System (INIS)

    Verma, Sangeeta; Limaye, S.N.; Saxena, M.C.

    1993-01-01

    Formation constants (log Ksub(MAL)sup(MA), log Ksub(ML)sup(M) and log Ksub(ML)sup(ML) of mixed ligand lanthanide(III) complexes of the type [Ln(III).A.ATP[ 2 , where LN(III)=La 3+ , Ce 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Eu 3+ , Gd 3+ , Tb 3+ or Dy 3+ ' A=NTA(nitrilotriacetate) or HEDTA (2-hydroxyethylethylenediamine triacetate) and ATP=adenosine 5'-triphosphate (L), and of the binary [Ln(III).ATP[ and [Ln(III).(ATP) 2 [ complexes have been determined by potentiometric pH titrations using the Irving-Rossotti approach at three temperatures 20, 30 and 40 degC and at a fixed ionic strength, I=0.2 mol dm -3 (NAclO 4 ). The solution stabilities (log Ksub(MAL)sup(MA) values) are influenced by the electrostatic effect involved in ternary complexation and increase with temperature. The enthalpy factor (ΔH) has been found to be small but unfavourable and the entropy factor (ΔS) large and favourable. The log Ksub(MAL)sup(MA) values lie in the order NTA>HEDTA with respect to A and La 3+ 3+ 3+ 3+ 3+ 3+ >Gd 3+ 3+ 3+ with respect to lanthanides. Tetrad effect is present in the formation constant values; its magnitude has been found to lie in the sequence f 7 >f 3 -f 4 ≅ f 10 -f 11 for the Ln(III) ions. Systematics in the formation constant values has been further studied by evaluating changes in the inter-electronic repulsion Racah parameters, extra stabilisation of specific 4f 9 -configurations and nephelauxetic ratio using experimental values of the formation constants. (author). 24 refs., 2 figs., 3 tabs

  13. TiO2-photocatalyzed As(III) oxidation in a fixed-bed, flow-through reactor.

    Science.gov (United States)

    Ferguson, Megan A; Hering, Janet G

    2006-07-01

    Compliance with the U.S. drinking water standard for arsenic (As) of 10 microg L(-1) is required in January 2006. This will necessitate implementation of treatment technologies for As removal by thousands of water suppliers. Although a variety of such technologies is available, most require preoxidation of As(III) to As(V) for efficient performance. Previous batch studies with illuminated TiO2 slurries have demonstrated that TiO2-photocatalyzed AS(III) oxidation occurs rapidly. This study examined reaction efficiency in a flow-through, fixed-bed reactor that provides a better model for treatment in practice. Glass beads were coated with mixed P25/sol gel TiO2 and employed in an upflow reactor irradiated from above. The reactor residence time, influent As(III) concentration, number of TiO2 coatings on the beads, solution matrix, and light source were varied to characterize this reaction and determine its feasibility for water treatment. Repeated usage of the same beads in multiple experiments or extended use was found to affect effluent As(V) concentrations but not the steady-state effluent As(III) concentration, which suggests that As(III) oxidation at the TiO2 surface undergoes dynamic sorption equilibration. Catalyst poisoning was not observed either from As(V) or from competitively adsorbing anions, although the higher steady-state effluent As(III) concentrations in synthetic groundwater compared to 5 mM NaNO3 indicated that competitive sorbates in the matrix partially hinder the reaction. A reactive transport model with rate constants proportional to incident light at each bead layer fit the experimental data well despite simplifying assumptions. TiO2-photocatalyzed oxidation of As(III) was also effective under natural sunlight. Limitations to the efficiency of As(III) oxidation in the fixed-bed reactor were attributable to constraints of the reactor geometry, which could be overcome by improved design. The fixed-bed TiO2 reactor offers an environmentally

  14. Estado nutricional y aspectos alimentarios de mujeres indígenas del departamento de Presidente Hayes, Paraguay

    OpenAIRE

    Gloria Echagüe; Valentina Díaz; Laura Mendoza; Pamela Mongelos; Graciela Giménez; Malvina Paez; Florentina Laspina; Amalia Castro; María Isabel Rodríguez; Patricia Araújo; Wilberto Castro; Ramón Marecos; Santiago Evers; Gerardo Deluca; Alejandra Picconi

    2015-01-01

    Introducción: Las comunidades indígenas presentan un mayor riesgo de inseguridad alimentaria y malnutrición, menor disponibilidad de recursos, y una creciente dependencia de alimentos más baratos aunque con un alto grado de procesamiento. Objetivo: Identificar el estado nutricional y aspectos alimentarios en mujeres indígenas de tres comunidades del Departamento de Presidente Hayes, Chaco Paraguayo. Metodología: Estudio observacional de diseño transversal con componente analítico, que incluyó...

  15. La ingeniería de requisitos orientada a aspectos: una experiencia de aplicación en un sistema de ayuda en línea

    Directory of Open Access Journals (Sweden)

    MARTA S. TABARES

    2007-01-01

    Full Text Available La Ingeniería de Rrequisitos Orientada a Aspectos provee enfoques para la elicitación y especificación de los asuntos y asuntos transversales en etapas tempranas de desarrollo de software. Este artículo presenta un caso de estudio para evaluar un modelo de la separación multidimensional de asuntos orientados a aspectos. Con el caso de estudio, se revisan sus características para la elicitación, análisis y trazabilidad de requisitos, así como algunas limitaciones del modelo y cómo este puede ser adaptado al proceso de desarrollo. Además, planteamos un conjunto de argumentos que podrían promover el desarrollo y evolución de este modelo

  16. Heterobimetallic gadolinium(III)-iron(III) complex of DTPA-bis(3-hydroxytyramide)

    International Nuclear Information System (INIS)

    Parac-Vogt, Tatjana N.; Kimpe, Kristof; Binnemans, Koen

    2004-01-01

    A derivative of diethylenetriamine-N,N,N',N'',N''-pentaacetic acid (DTPA), carrying two catechol functional groups has been synthesised by the reaction between DTPA-bis(anhydride) and 3-hydroxytyramine (dopamine). The ligand DTPA-bis(3-hydroxytyramide), [DTPA(HTA) 2 ], is able to form stable heterobimetallic complexes with gadolinium(III) and iron(III) ions. The gadolinium(III) occupies the internal coordination cage of DTPA formed by three nitrogens, two carboxylate and two amide oxygens, while the [Fe(NTA)(H 2 O) 2 ] (nitrilotriacetic acid, NTA) binds to catechol units by the substitution of two water ligands. The formation of polymeric species was avoided by using the tripodal NTA ligand. The heterobimetallic complex was characterised by means of visible absorption spectroscopy, electron spray ionisation-mass spectrometry (ESI-MS), and nuclear magnetic resonance (NMR) spectroscopy

  17. Separation of yttrium (III) from lanthanoids (III) by solvent extraction with substituted N-Alkylcarbonyl-N-phenylhydroxylamines

    International Nuclear Information System (INIS)

    Haraguchi, K.; Ogata, T.; Nakagawa, K.; Saitoh, T.; Kamidate, T.; Watanabe, H.

    1996-01-01

    A series of substituted N-alkylcarbonyl-N-phenylhydroxylamines(R-PHAs) were synthesized and utilized for the extraction of yttrium(III) and lanthanoids(III) in order to obtain effective extractants for the separation of yttrium(III) from the lanthanoids(III) and the mutual separation of the lanthanoids(III). The distribution ratio of yttrium(III) and the lanthanoids(III) between the carbon tetrachloride and the aqueous phases was measured as functions of the pH and the extractant concentration at 298 K at an ionic strength of 0.1 (NaNO 3 ). Yttrium(III) and the lanthanoids(III) were extracted with R-PHAs(HL) as self-adducted chelates of the form, ML 3 (HL) x , where 'x' is 1, 2 or 3 depending on the extraction system. The extractability of the metal ions decreased in the order of R-PHA having a primary, a secondary and a tertiary alkyl substituent attached to the carbonyl group because of the steric hindrance of the alkyl group. The separation factors for both Yb/Eu and Yb/Y pairs increased with increasing branching of the alkyl group of R-PHA. The excellent selectivity of R-PHAs having a tertiary alkyl group was attributable to a greater inductive effect of the tertiary alkyl group than those of the primary and secondary alkyl groups. The substituents at the phenyl group of R-PHAs gave no significant effect on the selectivity, while the extractability was enhanced considerably by introduction of electron withdrawing substituents at appropriate positions of the phenyl group of R-PHAs. (authors)

  18. Separation by liquid-liquid extraction of actinides(III) from lanthanides(III) using new molecules: the picolinamides

    International Nuclear Information System (INIS)

    Cordier, P.Y.

    1996-07-01

    In the field of long-lived radionuclides separation from waste generated during spent fuel reprocessing, the picolinamides have been chosen as potential extractants for the selective extraction of actinides (III) from lanthanides (III). The first studies initiated on the most simple molecule of the picolinamide family, namely 2-pyridinecarboxamide, pointed out that in an aqueous media the complexation stability constant between this ligand and Am(III) is roughly 10 times higher than the ones corresponding to Ln(III). The synthesis of lipophilic derivatives of 2-pyridinecarboxamide leaded to extraction experiments. The extraction of metallic cation by lipophilic picolinamides, according to a solvatation mechanism, is strongly dependent on the nature of the amide function: a primary amide function (group I) leads to a good extraction; on the contrary, there is a decrease for secondary (group II) and tertiary (group III) amide functions. From a theoretical point of view, this work leads finally to the following conclusions: confirmation of the importance of the presence of soft donor atoms within the extractants (nitrogen in our case) for An(III)/Ln(III). Also, sensitivity of this soft donor atom regarding the protonation reaction; prevalence in our case of the affinity of the extractant for the metallic cation over the lipophilia of the extractant to ensure good distribution coefficients. The extraction and Am(III)/Ln(III) separation performances of the picolinamides from pertechnetic media leads to the design of a possible flowsheet for the reprocessing of high level liquid waste, with the new idea of an integrated technetium reflux. (author)

  19. A imagem do Brasil no discurso do New York Times. Aspectos sociais

    Directory of Open Access Journals (Sweden)

    Maria Inez Mateus Dota

    2010-01-01

    Full Text Available Este texto presenta un análisis de las noticias publicadas en el periódico The New York Times, versión digital, entre los meses de enero y junio de 2004. Al relacionarlas con los aspectos sociales del Brasil se intenta ver cuál es la imagen que ese periódico muestra del Brasil. El artículo adopta como fundamentos teóricos y metodológicos el análisis del discurso, principalmente las contribuiciones de Bell (1991, Fairclough (1995 y 2001, Fowler (1991 y Sousa (2004, discute las estrategias discursivas usadas para representar al Brasil y examina qué elementos escoge y los recursos de lenguaje que son empleados para la producción de los textos analizados.

  20. Removal of arsenic from water using manganese (III) oxide: Adsorption of As(III) and As(V).

    Science.gov (United States)

    Babaeivelni, Kamel; Khodadoust, Amid P

    2016-01-01

    Removal of arsenic from water was evaluated with manganese (III) oxide (Mn2O3) as adsorbent. Adsorption of As(III) and As(V) onto Mn2O3 was favorable according to the Langmuir and Freundlich adsorption equilibrium equations, while chemisorption of arsenic occurred according to the Dubinin-Radushkevich equation. Adsorption parameters from the Langmuir, Freundlich, and Temkin equations showed a greater adsorption and removal of As(III) than As(V) by Mn2O3. Maximum removal of As(III) and As(V) occurred at pH 3-9 and at pH 2, respectively, while removal of As(V) in the pH range of 6-9 was 93% (pH 6) to 61% (pH 9) of the maximum removal. Zeta potential measurements for Mn2O3 in As(III) was likely converted to As(V) solutions indicated that As(III) was likely converted to As(V) on the Mn2O3 surface at pH 3-9. Overall, the effective Mn2O3 sorbent rapidly removed As(III) and As(V) from water in the pH range of 6-9 for natural waters.

  1. Design studies of back up cores for the experimental multi-purpose VHTR, (1)

    International Nuclear Information System (INIS)

    Yasuno, Takehiko; Miyamoto, Yoshiaki; Mitake, Susumu

    1982-09-01

    For the Experimental Multi-Purpose Very High Temperature Reactor, design studies have been made of two backup cores loaded with new type fuel elements. The purpose is to improve core operational characteristics of the standard design core (Mark-III core) consisting of pin-in-block type fuel element having externally cooled hollow fuel rods. The first backup core (semi-pin fuel core) is composed of fuel elements with internally cooled fuel pins, and the second core (multihole fuel core) is composed of multihole fuel elements, which can be adopted for the experimental VHTR as the substitution of the standard Mark-III fuel element. Either of the cores has 73 fuel columns and 4 m height. The arrangement of active core and reactor internal structure is same as that in the standard design core. These backup cores meet almost all design requirements of the VHTR and increase the margins for some important design items in comparison with the standard core (Mark-III core). This report describes the overall characteristics of nuclear, thermal-hydraulic, fuel and safety, and structural consideration for these cores. (author)

  2. Qualidade do sêmen de touros das raças Aberdeen Angus e Brangus-Ibagé em frente à degeneração testicular experimental induzida por dexametasona

    OpenAIRE

    Horn,Marilise Mesquita; Moraes,José Carlos Ferrugem; Galina,Carlos Salvador

    1999-01-01

    Foi administrada dexametasona para indução de degeneração testicular experimental em touros de uma raça taurina pura (Aberdeen Angus) e de sua sintética derivada (Brangus-Ibagé). O objetivo deste estudo foi o de averiguar a diferença de sensibilidade na função gametogênica em frente à degeneração experimental. Para tal, foram avaliados os aspectos físicos e morfológicos do sêmen. Os dados obtidos foram analisados considerando o dia de coleta e genótipo. Os resultados revelaram que os dois gru...

  3. Aspectos neuropsicológicos da depressão Aspectos neuropsicológicos de la depresión Neuropsychological aspects of depression

    Directory of Open Access Journals (Sweden)

    Marcia Rozenthal

    2004-08-01

    Full Text Available Este artigo objetiva rever os principais achados neuropsicológicos na depressão, procurando diferenciar o tipo unipolar do bipolar, com ou sem psicose, tanto nos períodos de fase aguda quanto nos períodos intercríticos. Procurou-se, ainda, correlacionar os achados neuropsicológicos descritos na literatura consultada com os seus correlatos neuroanatômicos e neurofuncionais, ressaltando-se as áreas frontais e seus principais circuitos. Considerando-se estudos neuropsicológicos dos transtornos afetivos, algumas alterações têm se mostrado mais consistentes, sendo descritas disfunções importantes nas fases críticas, mas também no paciente assintomático. Nestas, interessam principalmente os aspectos atentivos e mnêmicos e o funcionamento executivo. Estudos desta natureza têm profundas implicações terapêuticas, apontando para a necessidade de desenvolver outras técnicas coadjuvantes, tais como reabilitação cognitiva e intervenções psicossociais, tornando o tratamento mais abrangente e incisivo nestes casos.Este artículo tiene por objetivo revisar los principales hallazgos neuropsicológicos en la depresión, procurando diferenciar sus formas de presentación unipolar y bipolar, con o sin sintomatología psicótica, tanto en el cuadro agudo como en los periodos inter-críticos. Busca, además, correlacionar los hallazgos neuropsicológicos descritos en la literatura consultada con los aspectos neuroanatómicos y neurofuncionales, destacando el área cortical frontal y sus circuitos principales. Considerándose estudios neuropsicológicos en trastornos afectivos, algunas alteraciones de atención, memoria y de funciones ejecutivas se han presentado más frecuentemente, siendo descritas en los periodos de crisis y también en el paciente asintomático. Estudios de esa naturaleza tienen profundas implicaciones terapéuticas, señalando además la necesidad de desarrollar otras técnicas terapéuticas coadyuvantes, tales como la

  4. ASPECTOS FINANCIEROS DE LA REFORMA LOCAL

    Directory of Open Access Journals (Sweden)

    Amable Corcuera Torres

    2015-01-01

    Full Text Available En este trabajo se analizan los aspectos jurídico-financieros más relevantes que incluye la Ley 27/2013, de 27 de diciembre, de racionalización y sostenibilidad de la Administración Local. Las nuevas medidas incluidas en la citada Ley afectan tanto a los ingresos de los entes locales como a sus gastos. Al respecto, se abordan cuestiones relativas a los efectos económicos de la fusión de municipios, la supresión general de licencias, el contenido de los planes económico-financieros, el cálculo del coste efectivo de los servicios, el redimensionamiento del sector público local, la novedosa atribución a la Junta de Gobierno Local de la competencia para aprobar ciertos actos financieros, la disolución de entidades de ámbito territorial inferior al Municipio que no presenten sus cuentas antes de 31 de diciembre de 2014 o la posibilidad de reducir la deuda comercial o financiera a través de la venta de patrimonio público del suelo. In this work the most important legal and financial aspects including the Law 27/2013, of 27 December, rationalization and sustainability of local government are analyzed. The new measures included in that Act affect both the income of local authorities and their expenses. In this regard, issues concerning the economic effects of the merger of municipalities, the general abolition of licenses, the content of financial plans, the calculation of the actual cost of services, the local public sector downsizing, the novel addresses allocation to the Local Government of the power to grant certain financial actions, the dissolution of entities below the Municipality territory who do not submit their accounts before December 31, 2014 or the possibility of reducing the commercial or financial debt through the sale of public land heritage.

  5. Bronquiolite constritiva: aspectos tomográficos e correlação anatomopatológica

    Directory of Open Access Journals (Sweden)

    Nobre Luiz Felipe

    2002-01-01

    Full Text Available Os autores relatam os principais aspectos da bronquiolite constritiva na tomografia computadorizada de alta resolução (TCAR do tórax em ins e expiração, e os comparam aos achados anatomopatológicos, mediante estudo de três casos da doença em mulheres com idade entre 29 e 46 anos que apresentavam dispnéia incaracterística, de caráter progressivo, encaminhadas para realização de espirometria, TCAR do tórax e biópsia pulmonar. A TCAR do tórax em ins e expiração demonstrou, em dois casos, padrão de atenuação em mosaico difuso, acentuado na expiração. No terceiro caso foram observados nódulos centrolobulares, não sendo realizado estudo em expiração. O material histopatológico demonstrou estenose importante de luzes bronquiolares por espessamento fibroso da lâmina própria e atrofia do epitélio bronquiolar, alterações diagnósticas da bronquiolite constritiva. A realização de TCAR do tórax em ins e expiração mostrou-se de fundamental importância na suspeição de doenças relacionadas à obstrução de pequenas vias aéreas, sendo o aspecto de atenuação em mosaico na expiração característico da topografia periférica das lesões. O diagnóstico de bronquiolite constritiva deve ser confirmado por biópsia pulmonar por meio de toracotomia.

  6. Aspectos Contábeis dos Créditos de Carbono: Estudo com Autores Nacionais

    Directory of Open Access Journals (Sweden)

    Vanderlei dos Santos

    2013-12-01

    Full Text Available O estudo objetiva verificar o entendimento de autores nacionais no que concerne à classificação, forma de reconhecimento e mensuração das operações com créditos de carbono. O estudo de natureza descritiva foi realizado em 2011, por meio de pesquisa de levantamento ou survey, com abordagem quantitativa. Utilizou-se o questionário como instrumento de coleta de dados, que foi enviado a 23 pesquisadores nacionais que possuem publicação de artigos relacionados à contabilização dos créditos de carbono em periódicos nacionais. Obtiveram-se nove respostas, que constituíram numa amostra por acessibilidade. Para a análise dos dados obtidos optou-se pelo uso da técnica da entropia informacional. Os resultados do estudo mostraram que, quanto à classificação dos créditos de carbono, há um entendimento maior entre os autores de que se trata de ativos especiais e que não podem ser considerados como commodity. Observou-se que não há consenso entre os autores em classificar os créditos de carbono como ativo intangível ou estoque. Deste modo, concluiu-se que ainda existem divergências no entendimento dos autores analisados no que concerne aos aspectos contábeis das operações com créditos de carbono. O artigo contribui principalmente na medida em que busca consolidar diferentes opiniões de autores, que pesquisam sobre a temática, demonstrando aspectos convergentes e divergentes, além de enfatizar lacunas para desenvolver pesquisas futuras.

  7. Apuntes sobre globalización: aspectos culturales, tecnológicos y económicos

    Directory of Open Access Journals (Sweden)

    Mayden Solano Jiménez

    2014-01-01

    Full Text Available La internacionalización de las economías con una consecuente apertura de mercados, la modernización de los organismos tanto públicos como privados, el incremento en la competitividad, las privatizaciones, la reducción del tamaño del Estado y el enlazamiento de las economías; bien por la vía de la regionalización económica de áreas continentales o la integración de mercados en los que intervienen las más disímiles zonas geográficas del mundo; son algunas características propias del reacomodamiento o nuevo orden mundial. Dentro de este contexto, el presente artículo busca analizar el fenómeno de la globalización desde los aspectos: cultural, económico y tecnológico; los cuales han permeado varios sectores de la sociedad global, generando una interrelación e integración entre diversos actores, en donde no sólo confluye el Estado- nación, también da cabida a otros actores del Sistema Internacional. Por lo cual, se analiza el comportamiento de la aldea global y la cultura dentro del fenómeno de la globalización a partir de aspectos económicos y tecnológicos, resaltando la importancia de los medios de comunicación o la llamada era de la información, el mercado financiero global y por último, el papel que juega el proceso de integración y la necesidad de reestructurar las principales instituciones internacionales.

  8. Ferromagnetic dinuclear mixed-valence Mn(II)/Mn(III) complexes: building blocks for the higher nuclearity complexes. structure, magnetic properties, and density functional theory calculations.

    Science.gov (United States)

    Hänninen, Mikko M; Välivaara, Juha; Mota, Antonio J; Colacio, Enrique; Lloret, Francesc; Sillanpää, Reijo

    2013-02-18

    A series of six mixed-valence Mn(II)/Mn(III) dinuclear complexes were synthesized and characterized by X-ray diffraction. The reactivity of the complexes was surveyed, and structures of three additional trinuclear mixed-valence Mn(III)/Mn(II)/Mn(III) species were resolved. The magnetic properties of the complexes were studied in detail both experimentally and theoretically. All dinuclear complexes show ferromagnetic intramolecular interactions, which were justified on the basis of the electronic structures of the Mn(II) and Mn(III) ions. The large Mn(II)-O-Mn(III) bond angle and small distortion of the Mn(II) cation from the ideal square pyramidal geometry were shown to enhance the ferromagnetic interactions since these geometrical conditions seem to favor the orthogonal arrangement of the magnetic orbitals.

  9. Aspectos metodológicos na construção de projetos de pesquisa em Nutrição Clínica

    Directory of Open Access Journals (Sweden)

    Deyliane Aparecida De almeida Pereira

    2014-10-01

    Full Text Available O objetivo deste texto é fomentar a reflexão e a crítica no processo de elaboração de projetos de pesquisa em nutrição clínica. São apresentados aspectos relativos a evidências, validade e confiabilidade dos resultados dos estudos nesse campo. É imprescindível que ocorra adequado planejamento da pesquisa, desde a definição do delineamento e do tipo do experimento, passando pelos aspectos éticos, escolha da população e cálculo do tamanho amostral até a avaliação da factibilidade dos riscos envolvidos na sua condução. Após a coleta das informações, as etapas seguintes correspondem à descrição dos resultados, análise estatística, verificação da consistência desses resultados e, ao final, sua adequada interpretação.

  10. La Participación Transnacional en los Aspectos Religiosos de las Fiestas del Santo Patrón en una Comunidad Michoacana

    Directory of Open Access Journals (Sweden)

    Sergio M. Martínez

    2007-12-01

    Full Text Available En este trabajo de investigación se analiza la participación transnacional en las mayordomías y en los aspectos religiosos durante las fiestas patronales de San Miguel Arcángel en un pueblo de la rivera del Lago de Pátzcuaro, Michoacán. Mediante un acercamiento etnográfico colaborativo en que los investigadores han participado activamente y han tomado apuntes durante los días de la fiesta se ha involucrando la descripción densa y análisis reflexivo de cada uno de los eventos religiosos. Al final se han triangulado los resultados para concluir que participación transnacional en esta comunidad es de suma importancia en varios aspectos, pero especialmente para mantener los vínculos religiosos de los emigrantes y lugareños y de la participación en el culto al santo patrón de futuras generaciones que transmigran entre México—Estados Unidos.

  11. Carbonato-bridged Ni(II)2Ln(III)2 (Ln(III) = Gd(III), Tb(III), Dy(III)) complexes generated by atmospheric CO2 fixation and their single-molecule-magnet behavior: [(μ4-CO3)2{Ni(II)(3-MeOsaltn)(MeOH or H2O)Ln(III)(NO3)}2]·solvent [3-MeOsaltn = N,N'-bis(3-methoxy-2-oxybenzylidene)-1,3-propanediaminato].

    Science.gov (United States)

    Sakamoto, Soichiro; Fujinami, Takeshi; Nishi, Koshiro; Matsumoto, Naohide; Mochida, Naotaka; Ishida, Takayuki; Sunatsuki, Yukinari; Re, Nazzareno

    2013-06-17

    Atmospheric CO2 fixation of [Ni(II)(3-MeOsaltn)(H2O)2]·2.5H2O [3-MeOsaltn = N,N'-bis(3-methoxy-2-oxybenzylidene)-1,3-propanediaminato], Ln(III)(NO3)3·6H2O, and triethylamine occurred in methanol/acetone, giving a first series of carbonato-bridged Ni(II)2Ln(III)2 complexes [(μ4-CO3)2{Ni(II)(3-MeOsaltn)(MeOH)Ln(III)(NO3)}2] (1Gd, 1Tb, and 1Dy). When the reaction was carried out in acetonitrile/water, it gave a second series of complexes [(μ4-CO3)2{Ni(II)(3-MeOsaltn)(H2O)Ln(III)(NO3)}2]·2CH3CN·2H2O (2Gd, 2Tb, and 2Dy). For both series, each Ni(II)2Ln(III)2 structure can be described as two di-μ-phenoxo-bridged Ni(II)Ln(III) binuclear units bridged by two carbonato CO3(2-) units to form a carbonato-bridged (μ4-CO3)2{Ni(II)2Ln(III)2} structure. The high-spin Ni(II) ion has octahedral coordination geometry, and the Ln(III) ion is coordinated by O9 donor atoms from Ni(II)(3-MeOsaltn), bidentate NO3(-), and one and two oxygen atoms of two CO3(2-) ions. The NO3(-) ion for the first series roughly lie on Ln-O(methoxy) bonds and are tilted toward the outside, while for the second series, the two oxygen atoms roughly lie on one of the Ln-O(phenoxy) bonds due to the intramolecular hydrogen bond. The temperature-dependent magnetic susceptibilities indicated a ferromagnetic interaction between the Ni(II) and Ln(III) ions (Ln(III) = Gd(III), Tb(III), Dy(III)) for all of the complexes, with a distinctly different magnetic behavior between the two series in the lowest-temperature region due to the Ln(III)-Ln(III) magnetic interaction and/or different magnetic anisotropies of the Tb(III) or Dy(III) ion. Alternating-current susceptibility measurements under the 0 and 1000 Oe direct-current (dc) bias fields showed no magnetic relaxation for the Ni(II)2Gd(III)2 complexes but exhibited an out-of-phase signal for Ni(II)2Tb(III)2 and Ni(II)2Dy(III)2, indicative of slow relaxation of magnetization. The energy barriers, Δ/kB, for the spin flipping were estimated from the Arrhenius

  12. Supersymmetric type-III seesaw mechanism: Lepton flavor violation and LHC phenomenology

    OpenAIRE

    Hirsch, Martin; Porod, Werner; Staub, Florian; Weiss, Christian H.

    2013-01-01

    We study a supersymmetric version of the type-III seesaw mechanism considering two variants of the model: a minimal version for explaining neutrino data with only two copies of 24 superfields and a model with three generations of 24-plets. The latter predicts, in general, rates for mu -> e gamma inconsistent with experimental data. However, this bound can be evaded if certain special conditions within the neutrino sector are fulfilled. In the case of two 24-plets, lepton flavor violation cons...

  13. Formación en recreación en Colombia: aspectos fundamentales para el estudio

    OpenAIRE

    Juan Manuel Carreño Cardozo; Narda Dioselina Robayo Fique

    2010-01-01

    El escrito presenta la reflexión fundamental de la investigación Estado del arte de los conceptos de recreación en Colombia, en Instituciones de educación técnica-tecnológica y de pregrado en recreación y afines originado en la línea de Investigación formar - Formación de Maestros en Recreación3 del programa Licenciatura en Recreación de la Facultad de Educación Física en la Universidad Pedagógica Nacional. La reflexión contiene los aspectos fundamentales que se postulan en la investigación p...

  14. CCDC 1049111: Experimental Crystal Structure Determination : Pyrazolium trans-tetrachlorido-bis(1H-pyrazole)-osmium(iii)

    KAUST Repository

    Kuhn, Paul-Steffen; Bü chel, Gabriel E.; Jovanović, Katarina K.; Filipović, Lana; Radulović, Siniša; Rapta, Peter; Arion, Vladimir B.

    2015-01-01

    An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

  15. CCDC 1049112: Experimental Crystal Structure Determination : Indazolium trans-tetrachlorido-bis(2H-indazole)-osmium(iii)

    KAUST Repository

    Kuhn, Paul-Steffen; Bü chel, Gabriel E.; Jovanović, Katarina K.; Filipović, Lana; Radulović, Siniša; Rapta, Peter; Arion, Vladimir B.

    2015-01-01

    An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

  16. Apontamentos sobre educação e trabalho no Brasil contemporâneo: aspectos da contrarreforma educacional

    Directory of Open Access Journals (Sweden)

    Fabiana de Cássia Rodrigues

    2017-12-01

    Full Text Available O presente artigo articula a temática da educação e trabalho com os desafios brasileiros em sua inserção na divisão internacional do trabalho, segundo as especificidades de sua formação social, marcada pelo capitalismo dependente e subdesenvolvido. Partimos da formulação das seguintes questões: De que educação necessitam os trabalhadores na realidade brasileira atual, segundo a ótica do capital? O esvaziamento de conteúdos e sentidos da educação estaria em consonância com as mudanças na estrutura ocupacional brasileira? A simplificação dos conteúdos trabalhados na escola traz quais exigências à formação docente? A fim de discuti-las a redação foi dividida em duas partes. Na primeira parte do texto, partiremos dos retrocessos atuais na estrutura produtiva, procurando evidenciar as suas determinações históricas. Coloca-se também em destaque as diretrizes educacionais formuladas pelos organismos multilaterais em consonância com as mudanças na estrutura ocupacional brasileira que contribuem para explicar as políticas que esvaziam a formação das trabalhadoras e trabalhadores. Na segunda parte, trataremos de aspectos da política educacional brasileira que materializam as perspectivas dos organismos multilaterais para a educação no contexto social brasileiro. Foram abordados três aspectos: 1 A elaboração da Base Nacional Comum Curricular; 2 As novas diretivas para formação de professores; 3 O Projeto Escola Sem Partido como mecanismo de pressão para minimizar o caráter formativo da escola. Percebemos que os três aspectos em questão articulados promovem um esvaziamento da escola e da formação de professores de conhecimentos científicos e político-culturais, contrários às reivindicações educacionais na luta pela redemocratização nos anos de 1980, conformando, desse modo, um movimento de contrarreforma.

  17. Aspectos más significativos en la revisión de proyectos de cimientos y estructuras de edificación

    Directory of Open Access Journals (Sweden)

    Gómez Hermoso, Jesús

    2000-08-01

    Full Text Available This document show all important aspects on the foundation and structure building project check. No speaking about calculation problems, it enumerate the qualities aspects that could be checked and all that have major effect in a good project and construction quality. It considerers at first, the relation between the structure and the architecture and the equipment building, and with the urbanistic aspects and the soil characteristics. Later, it talks about the typical aspects of structure, like materials, actions, general calculation and the checking of different elements (fancing pile, supports , beams and slabs. It speaks about concrete, metallic and wood structures.En el presente artículo se muestran todos aquellos aspectos que se consideran importantes en la revisión del proyecto de la cimentación y la estructura de un edificio. Sin entrar en problemas concretos de cálculo, se enumeran los aspectos cualitativos que han de comprobarse y se subrayan todos aquéllos que pueden tener una mayor repercusión en la buena calidad del proyecto y de la obra. Se tiene en cuenta, en primer lugar, la interrelación de la estructura con la arquitectura y las instalaciones del edificio, así como la que tiene (junto a la cimentación con el entorno urbanístico y las características del terreno. Posteriormente se tratan los aspectos más propios del proyecto de estructura, como son los materiales, las acciones, el cálculo general y la comprobación de los distintos elementos (zapatas, pilotes, encepados. pilas. vigas y forjados. Junto a las estructuras de hormigón armado se analizan las metálicas y las de madera laminada encolada.

  18. Analysis of gas-liquid metal two-phase flows using a reactor safety analysis code SIMMER-III

    International Nuclear Information System (INIS)

    Suzuki, Tohru; Tobita, Yoshiharu; Kondo, Satoru; Saito, Yasushi; Mishima, Kaichiro

    2003-01-01

    SIMMER-III, a safety analysis code for liquid-metal fast reactors (LMFRs), includes a momentum exchange model based on conventional correlations for ordinary gas-liquid flows, such as an air-water system. From the viewpoint of safety evaluation of core disruptive accidents (CDAs) in LMFRs, we need to confirm that the code can predict the two-phase flow behaviors with high liquid-to-gas density ratios formed during a CDA. In the present study, the momentum exchange model of SIMMER-III was assessed and improved using experimental data of two-phase flows containing liquid metal, on which fundamental information, such as bubble shapes, void fractions and velocity fields, has been lacking. It was found that the original SIMMER-III can suitably represent high liquid-to-gas density ratio flows including ellipsoidal bubbles as seen in lower gas fluxes. In addition, the employment of Kataoka-Ishii's correlation has improved the accuracy of SIMMER-III for gas-liquid metal flows with cap-shape bubbles as identified in higher gas fluxes. Moreover, a new procedure, in which an appropriate drag coefficient can be automatically selected according to bubble shape, was developed. Through this work, the reliability and the precision of SIMMER-III have been much raised with regard to bubbly flows for various liquid-to-gas density ratios

  19. Interpretation of recovery Stage III in gold: a comment on the paper of A. Seeger and W. Frank

    Energy Technology Data Exchange (ETDEWEB)

    Sonnenberg, K.; Dedek, U.; Ehrhart, P.; Schilling, W. (Kernforschungsanlage Juelich G.m.b.H. (Germany, F.R.). Inst. fuer Festkoerperforschung)

    1983-09-01

    The attempt of Seeger and Frank to reinterpret the annealing in recovery Stage III in gold in terms of the mobile single interstitial is discussed. Considering the experimental data of Stage III in irradiated samples and for the annealing stage observed in quenching samples around room temperature, it is concluded that the assignment of the recovery in these two stages to two different elementary defects is unjustified. It is further demonstrated that the interpretation of recovery Stage III by interstitial migration is in conflict with the direct observations of vacancies migrating in this stage and that the interpretation of the recovery measurements in radiation doped gold by the two interstitial model leads to inconsistencies. The attempt to interpret recovery Stage III in gold by interstitial migration must therefore be rejected and the activation energy of 0.71 eV measured for this stage must be attributed to the migration energy of single vacancies.

  20. Determination of As(III and As(V in waters by chronopotentiometric stripping analysis

    Directory of Open Access Journals (Sweden)

    Švarc-Gajić Jaroslava V.

    2006-01-01

    Full Text Available Arsenic is a naturally occurring toxic and carcinogenic element. The degree of the toxicity depends on its chemical form and the concentration. Application of a sensitive, selective, simple and rapid method for detection and monitoring of different oxidation states of arsenic in waters is of great importance because main route of population exposure is through drinking water. In this work chronopotentiometric stripping analysis (CSA was used for the determination of As(III and As(V in tap, well, river and rain waters from Vojvodina (Serbia. Gold film electrode on the glassy carbon support was used as the working electrode. The experimental parameters of the technique were investigated and optimized. Detection limit of the method for the electrolysis time of 600 s was 2 μg/dm3 of As(III.

  1. Complexes between lanthanide (III) and yttrium (III) picrates and tetra methylene sulfoxide as ligand

    International Nuclear Information System (INIS)

    Silva, M.A.A. da.

    1991-01-01

    The preparation and characterization of addition compounds between lanthanide (III) and yttrium (III) picrates and tetra methylene sulfoxide as ligand were described. The adducts were prepared in the molar relation 1 (salt): 3(ligand) in ethanol. They are microcrystalline with more intense color than those of their respective hydrated salts. At room temperature conditions they are non hygroscopic and do not present perceptible alterations. They became slightly opalescent, when heated between 363 and 423 K. At higher temperatures under several heating ratios, the behavior shown is the same: melting between 439 and 472 K. The characterization of the compounds was made by elemental analysis, electrolytic conductance measurements, X-ray powder patterns, infrared spectroscopy, visible electronic absorption and emission spectra of the neodymium (III) and europium (III), respectively. (author). 116 refs., 17 tabs., 11 figs

  2. Aspectos fundamentais no desenvolvimento de sistemas microemulsionados contendo anfotericina B para uso oftálmico

    Directory of Open Access Journals (Sweden)

    Walteçá Louis Lima Silveira

    2013-01-01

    Full Text Available A exemplo do que ocorre com outros fármacos, a biodisponibilidade da anfotericina B (AmB através da via ocular repreesenta um grande desafio para a pesquisa científica. Na verdade, a baixa biodisponibilidade apresentada por tal molécula é devido, principalmente, a presença das barreiras oculares que impedem a absorção deste fármaco para os tecidos internos. A toxicidade associada a este fármaco, assim como a sua baixa capacidade em permear a córnea íntegra também consiste em um problema associado ao seu uso clínico. Novos veículos seguros e eficazes para a liberação ocular da AmB são, portanto, necessários. As microemulsões (MEs aparecem como um interessante sistema devido à sua transparência, estabilidade termodinâmica e favorável viscosidade. O conhecimento do processo de formação das MEs contendo AmB, assim como a compreensão de toda a sua caracterização físicoquímica correspondem a aspectos importantes para se determinar as condições favoráveis para que estes sistemas venham a ser empregados como colírios. Esta revisão tem como objetivo, portanto, abordar este tema enfatizando os principais aspectos relacionados com a utilização de MEs como sistemas de liberação para a AmB através da via tópica oftálmica.

  3. Diversos aspectos atinentes a la esclavitud en Buenos Aires derivados del análisis de las fuentes notariales, 1821-1830

    Directory of Open Access Journals (Sweden)

    Miguel A. Rosal

    2004-11-01

    Full Text Available El presente trabajo constituye un avance de la investigación sobre el negro porteño a partir de la segunda década post-revolucionaria, a través de la consulta de los distintos registros de los Protocolos Notariales, conservados en el Archivo General de la Nación. En síntesis, el artículo pretende ilustrar aspectos que quizá no hayan merecido la necesaria atención por parte de los investigadores de la problemática afroporteña durante el período independiente; nos referimos al análisis del fenómeno de la manumisión, preciada o graciosa, de la libertad futura condicional, de la figura del negro propietario de bienes inmuebles y de esclavos, como así también de los testamentos de las personas "de color". Parece útil, entonces, intentar estos estudios que nos podrán iluminar sobre aspectos poco o nada conocidos de los morenos y pardos de Buenos Aires durante el siglo XIX.

  4. Investigation of the State of Radionuclides in Ultramicroconcentrations by the Method of a Horizontal Zone Electrophoresis in a Free Electrolyte. Ions of In(III) in Aqueous Solutions

    CERN Document Server

    Bontchev, G D; Priemyshev, A N; Bozhikov, G A; Filossofov, D V; Ivanov, P I; Maslov, O D; Milanov, M V; Dmitriev, S N

    2000-01-01

    Using the electromigration method in a free electrolyte the behaviour of In(III) in some water solutions has been investigated. Data on electrophoretic mobility of In(III) as well as its complexes with DTPA and EDTA in a wide range of pH and temperature have been collected. On the basis of experimental results the diffusion coefficient of In(III) and concentration stability constant of a complex [InDTPA]^2- have been estimated.

  5. Aspectos de la infección urinaria en el adulto

    Directory of Open Access Journals (Sweden)

    Daisy María Contreras Duverger

    1998-02-01

    Full Text Available Se realiza una revisión bibliográfica de aspectos importantes de la infección urinaria inespecífica, que se consideran de interés para la mejor preparación del médico general integral. Se describen las terminologías microbiológicas y las utilizadas para evaluar la respuesta al tratamiento, así como la clasificación más actual de esta entidad. Se mencionan los tipos de tratamiento y las drogas más utilizadas, y se enfatiza en el uso de las quinolonasIt is made a bibliographic review of some important aspects of unspecific urinary infection that are considered of interest for a better training of the general comprehensive physician. A description is made of the microbiological terminolgies and of those used to evaluate the response to the treatment, as well as of the latest classification of this disease. The different types of treatment and the most used drugs are mentioned here. Emphasis is made on the use of quinolines

  6. Aspecto de la Agricultura Intensiva en la Provincia de Ocaña, Departamento Norte de Santander.

    Directory of Open Access Journals (Sweden)

    Obregón Botero Rafael

    1941-10-01

    Full Text Available Un inteligente sentido de lógica deducción, unido al patriótico esfuerzo por el mejoramiento de su tierra, llevó al Dr. Luis Carvajalino Jácome a la conclusión de que el problema de la agricultura intensiva en la Provincia de Ocaña (Santander del Norte presentaba aspectos tan diversos y complejos, que quiso por todos los medios interesar a los Gobiernos Nacional y Departamental en una favorable solución. Fue así como en el cumplimiento de un programa de resurgimiento progresivo de la industria agrícola, este conocido profesional nortesantandereano pidió al Ministerio de la Economía Nacional se comisionara a un Fitopatólogo y a un Entomólogo para estudiar los problemas surgidos del creciente aumento de plagas y enfermedades en la región y especialmente el decaimiento que por estos factores notábase en la industria cebollera. Atendiendo a la insinuación, el Ministerio de la Economía tuvo a bien encargarnos de tan interesante comisión y para el mejor cumplimiento a nuestro juicio, estudiamos y observamos con algún detenimiento los diferentes aspectos de su agricultura. Estas observaciones y conclusiones las queremos presentar y ofrecer como una modesta cooperación al programa de progreso en cuyos resultados finales están empeñados tanto sus dirigentes como el pueblo de Santander. A pesar de que nuestra misión se limitaba al estudio de la sanidad de los cultivos, quisimos hacer extensivas las observaciones a otros puntos de vital importancia, toda vez que las modalidades de la región presentaban aspectos de un problema que pudiéramos llamar nuevo para nuestra agricultura nacional. Quizás el cultivo del café en las tierras del Quindío tienen un verdadero aspecto de agricultura intensiva con caracteres de económica importancia, pero aparte de ésta y de contadas regiones del país, nos atrevemos a opinar que la localidad ahora descrita se perfila como exponente de la futura agricultura intensiva a la cual

  7. Surdez súbita idiopática: aspectos etiológicos e fisiopatogênicos Idiopathic sudden sensorineural hearing loss: etiopathogenic aspects

    Directory of Open Access Journals (Sweden)

    Paulo Roberto Lazarini

    2006-08-01

    Full Text Available Vários fatores têm sido postulados como causa da surdez súbita idiopática. Por meio de uma revisão bibliográfica foi feita uma análise crítica quanto aos aspectos etiológicos e fisiopatogênicos desta manifestação clínica. Estudos atuais sugerem que os distúrbios vasculares, a ruptura de membranas da orelha interna e as doenças auto-imunes são possíveis causas, mas a afecção viral tem recebido maior atenção nos últimos anos, embora ainda pouco se conheça sobre os mecanismos da surdez súbita idiopática. Os vírus podem causar a perda súbita da audição na infecção aguda, mas a forma latente, com uma possível reativação viral, também tem sido considerada no mecanismo de agressão à cóclea. Apesar de uma alteração da viscosidade sangüínea poder explicar a perda auditiva, estudos experimentais e clínicos não mostram sinais de ossificação e de fibrose na cóclea ou de ruptura de membranas do labirinto. Estes fatos contrapõem, respectivamente, a teoria vascular e a da fístula labiríntica. A eventual presença de anticorpos contra a orelha interna sugere que a surdez súbita idiopática possa ser de natureza auto-imune, fato este também não confirmado pela falta de relação entre os aspectos clínicos e morfológicos da doença auto-imune e da perda auditiva. A surdez súbita idiopática é, ainda, um tema controverso e obscuro em diversos aspectos.Several factors have been postulated to elicit the etiology of idiopathic sudden sensorineural hearing loss. Through a bibliographic review, we made a critical analysis of the different etiopathogenic aspects of its clinical manifestation. The most recent studies concerning the possible causes of sudden hearing loss suggest vascular disorders, rupture of the inner ear membrane and autoimmune diseases; however, viral infections have received a great deal of attention in recent years. Little is known about the mechanism of sudden hearing loss. Viruses can cause

  8. DSM-III-R and religion.

    Science.gov (United States)

    Post, S G

    1992-07-01

    The interpretation of religion in DSM-III-R contains considerable negative bias and contributes to unfair stereotypes of religious persons. Particularly new religious movements and religious conversion are unfairly interpreted under the DSM-III-R heading, 'Dissociative Disorder Not Otherwise Specified'. It is suggested that a more balanced and respectful interpretation of religion is needed in DSM-III-R, since psychiatry through its official nomenclature should not contribute to social intolerance of religious nonconformity.

  9. Origin of SMM behaviour in an asymmetric Er(III) Schiff base complex: a combined experimental and theoretical study.

    Science.gov (United States)

    Das, Chinmoy; Upadhyay, Apoorva; Vaidya, Shefali; Singh, Saurabh Kumar; Rajaraman, Gopalan; Shanmugam, Maheswaran

    2015-04-11

    An asymmetric erbium(III) Schiff base complex [Er(HL)2(NO3)3] was synthesized which shows SMM behaviour with an Ueff of 5.2 K. Dipolar interaction in 1 significantly reduced upon dilution which increases the barrier height to 51.5 K. Ab initio calculations were performed to shed light on the mechanism of magnetization relaxation.

  10. Sindrome de Landau Kleffner aspectos clinicos, eletrencefalograficos e psicossociais : estudo de seguimento a longo prazo

    OpenAIRE

    Marcos Henrique Coelho Duran

    2008-01-01

    Resumo: Objetivos: A Síndrome de Landau-Kleffner (SLK) é uma entidade rara, caracterizada por epilepsia e afasia. Ocorre em crianças com aquisição normal da linguagem, geralmente, entre 3 e 7 anos de idade. A evolução a longo prazo é controversa e pouco estudada. O presente estudo tem como objetivo verificar a evolução em uma série de sujeitos com diagnóstico de SLK, enfocando os aspectos clínicos, eletrencefalográficos, psicossociais e da qualidade de vida. Métodos: Trata-se de um estudo tra...

  11. Aspectos históricos de libros relevantes de la historia de la pediatría

    OpenAIRE

    Vargas Rubiano, Alfonso

    2010-01-01

    El comité Editorial de Pediatría, Diagnostico y Tratamiento, me ha solicitado la redacción del Prólogo para su segunda edición, "deseando que se haga mención de algunos aspectos históricos del desarrollo de la Pediatría en la Universidad Nacional de Colombia y la contribución a éste proceso del profesor José Ignacio Barberi y del Hospital de la Misericordia." Para cumplir tan obligante invitación de los profesores Edgar Rojas, Hector Ulloque, Fernando Sarmiento y Carlos Medina, he revisado la...

  12. Placentação em cutias (Dasyprocta aguti, CARLETON, M.D.): aspectos morfológicos

    OpenAIRE

    Rodrigues, Rosângela Felipe; Miglino, Maria Angelica; Ferraz, Rosa Helena dos Santos; Morais-Pinto, Luciano de

    2003-01-01

    A cutia é um roedor silvestre, encontrado no sul da América Central e em regiões tropicais da América do Sul, principalmente nas regiões norte, nordeste e sudeste do Brasil. Estes animais fornecem proteína de origem animal e por isso, apresentam importância sócio-econômica para as regiões do norte e nordeste do Brasil. Para o presente trabalho foram utilizadas sete placentas de cutias (Dasyprocta aguti), em diferentes fases da gestação. Nos aspectos morfológicos a placenta da cutia apresenta ...

  13. Aspectos significativos surgidos de la experiencia de haber sido responsable de un evento adverso en salud

    Directory of Open Access Journals (Sweden)

    Augusto Hernán Ferreira-Umpiérrez

    2014-01-01

    Full Text Available Objetivo: conocer los aspectos significativos para las enfermeras sobre su experiencia de haber sido responsables de un evento ad- verso en salud. Materiales y métodos: estudio cualitativo exploratorio, con el enfoque de la hermenéutica dialéctica. Se utilizó la técnica de análisis de contenido. Muestra constituida por doce enfermeras que tuvieron al menos una experiencia de responsabilidad ante un evento adverso con un paciente, y por cuatro supervisores de enfermería con responsabilidad de supervisión al ocurrir el evento adverso. Resultados: bajo el enfoque de la hermenéutica dialéctica, el análisis de los datos permitió construir las siguientes categorías relacio- nadas con la organización de salud y los recursos humanos: el contexto organizacional, el desconocimiento del proceso de notifi cación, la sobrecarga de trabajo, la ausencia de descanso. Conclusiones: reconocer la importancia del contexto organizacional donde se desarrollan los cuidados, el desconocimiento del proceso de notificación como aspecto por mejorar, la sobrecarga de trabajo y la ausencia d e descanso del personal. Es necesario profundizar en el tema mediante investigaciones y desarrollo de intervenciones que promuevan la cult ura de seguridad en la atención sanitaria, con implicaciones en la práctica y para la formación de las enfermeras.

  14. Determination of Cu(III) and Cu(II)+Cu(III) in superconducting copper ceramics

    International Nuclear Information System (INIS)

    Nedelcheva, T.; Kostadinova, L.; Stoyanova-Ivanova, A.; Ivanova, I.

    1992-01-01

    Copper(III) and total copper in superconducting Y-Ba-Cu oxide and related compounds can be determinated by two successive iodimetric titrations after the sample has been dissolved under Ar in HCl/KI medium. First, the iodine equivalent to copper(III) is titrated with Na 2 S 2 O 3 solution at pH 4.8, copper(II) being masked with EDTA. The total copper is then determined in the same solution by demasking with acid and iodide, followed by iodimetric titration. The method is both accurate and reproducible. The relative standard deviations for 1.074% copper(III) and 23.37% total copper are 0.8% and 0.3%, respectively. (orig.)

  15. Ensino da Arte na escola pública e aspectos da política educacional: contexto e perspectivas Enseñanza del arte en la escuela pública y aspectos de la política educacional: contexto y perspectivas Teaching of art at public schools and educational politics aspects: contexts and perspectives

    Directory of Open Access Journals (Sweden)

    Karina Barra Gomes

    2008-12-01

    Full Text Available Este artigo procura ampliar constatações e considerações que abrangem o ensino da Arte na escola pública e aspectos da política educacional. Nossa inquietação, quanto ao percurso do ensino artístico no país e a sua realidade nos dias atuais, levounos a contextualizá-lo a aspectos da política educacional, associando o ensino a questões que incitam a conscientização dos professores de Arte, sua atuação e o envolvimento com a prática pedagógica diante das condições educacionais que nos permite viver a política educacional marcada pela globalização e pela pós-modernidade.Este artículo busca ampliar constataciones y consideraciones que abarcan la enseñanza del Arte en la escuela pública y aspectos de la política educacional. Nuestra inquietud con relación al curso de la enseñanza artística en el país y su realidad en los días actuales nos llevó a contextualizarla a aspectos de la política educacional, asociando la enseñanza a cuestiones que incitan la concientización de los profesores del Arte, su actuación y el envolvimiento con la práctica pedagógica frente a las condiciones educacionales que nos permite vivir la política educacional, marcada por la globalización y por la pos-modernidad.This article aims to amplify the evidences and considerations that deal with the teaching of Art in public schools and also with some public politics aspects. Our worries about the teaching of Art path in this country and its reality nowadays has driven us to conceptualize it with some educational politics aspects, associating the teaching of Art to subjects that stir teachers' awareness, their performance and their involvement in pedagogic practices in the pedagogic conditions, that allowed us to live the pedagogic politics which are marked by globalization and postmodernism.

  16. Speciation of Am(III)/Eu(III) sorbed on γ-alumina. Effect of metal ion concentration

    International Nuclear Information System (INIS)

    Kumar, S.; Tomar, B.S.; Godbole, S.V.

    2013-01-01

    The present paper describes the speciation of Am(III)/Eu(III) sorbed on γ-alumina, and its evolution with changing metal ion concentration, studied using batch sorption experiment, time resolved fluorescence spectroscopy (TRFS), extended X-ray absorption fine structure (EXAFS) and surface Complexation modeling (SCM). Though numerous studies exist in the literature on the speciation of trivalent actinides and lanthanides on alumina surface, the mechanism of sorption at high metal ion concentrations is not yet fully understood. Batch sorption experiments of Am(III) on γ-alumina under varying condition of pH (3-10), ionic strength (0.005-0.1 M NaClO 4 ) and metal ion concentration (10 -7 -10 -4 M) were performed. Higher metal ion concentration was achieved by the addition of Eu(III) considering it as an analogue of Am(III). Time resolved fluorescence spectroscopy (TRFS) study of Eu(III) sorbed on γ-alumina at the metal ion concentration of 5.0 x 10 -5 M was carried out over pH 4 to 7. TRFS showed the presence of two surface species, with distinctly different fluorescence decay life times. The shorter lifetime value and its changing pattern with pH indicate the surface species corresponding to this component to be monodentate species > AlOAm 2+ and its hydrolyzed forms. The sorbed Eu 3+ species corresponding to the longer lifetime value has 2-3 water molecules in its first coordination sphere and is multidentate in its binding on alumina surface. Extended X-ray absorption fine structure (EXAFS) measurement of Eu:γ-Al 2 O 3 sorption systems at pH 6.18 and 7.15 corroborate the existence of two surface complexes. Further it suggests the edge sharing bidentate binding of Eu on AlO 6 octahedra as the co-ordination mode of the higher lifetime component. Surface Complexation Modeling (SCM) of Am(III)/Eu(III) sorption onto γ-alumina at pH ≤7 has been carried out using these two surface species. 2-pK surface complexation modeling coupled with constant capacitance model

  17. Historical and social aspects of halitosis Los aspectos históricos y sociales de halitosis Aspectos históricos e sociais da halitose

    Directory of Open Access Journals (Sweden)

    Marina Sá Elias

    2006-10-01

    Full Text Available Buccal odors have always been a factor of concern for society. This study aims to investigate the historical and social base of halitosis, through systematized research in the database BVS (biblioteca virtual em saúde - virtual library in health and also in books. Lack of knowledge on how to prevent halitosis allows for its occurrence, limiting quality of life. As social relationships are one of the pillars of the quality of life concept, halitosis needs to be considered a factor of negative interference. Education in health should be accomplished with a view to a dynamic balance, involving human beings' physical and psychological aspects, as well as their social interactions, so that individuals do not become jigsaw puzzles of sick parts.Los olores bucales siempre han sido un factor de preocupación para la sociedad, y ellos todavía son ahora. El objetivo de este estudio es hacer una base histórica y social en la halitosis. Fue efectuada una investigación sistematizada en la base de datos BVS (biblioteca virtual em saúde - la biblioteca virtual en salud y también en los libros. La ignorancia en cómo prevenir la halitosis permite su ocurrencia, que limita la calidad de vida. Siendo las relaciones sociales uno de los pilares del concepto de calidad de vida, es necesario considerar la halitosis un factor de interferencia negativa. La educación en salud se debe llevar a cabo buscando un equilibrio dinámico, involucrando los aspectos físicos y psicológicos del ser humano, así como sus interacciones sociales, para que los individuos no se vuelvan rompecabezas de partes enfermas.O problema referente aos odores bucais sempre foi fator de preocupação para a sociedade e ainda hoje se mostra presente. O objetivo do presente estudo foi realizar um embasamento histórico e social sobre a halitose. Para tanto, foi feita busca sistematizada, selecionando artigos por meio da base de dados BVS (Biblioteca Virtual em Saúde e também pesquisa em

  18. Highly Sensitive Aluminium(III) Ion Sensor Based on a Self-assembled Monolayer on a Gold Nanoparticles Modified Screen-printed Carbon Electrode.

    Science.gov (United States)

    See, Wong Pooi; Heng, Lee Yook; Nathan, Sheila

    2015-01-01

    A new approach for the development of a highly sensitive aluminium(III) ion sensor via the preconcentration of aluminium(III) ion with a self-assembled monolayer on a gold nanoparticles modified screen-printed carbon electrode and current mediation by potassium ferricyanide redox behavior during aluminium(III) ion binding has been attempted. A monolayer of mercaptosuccinic acid served as an effective complexation ligand for the preconcentration of trace aluminium; this led to an enhancement of aluminium(III) ion capture and thus improved the sensitivity of the sensor with a detection limit of down to the ppb level. Under the optimum experimental conditions, the sensor exhibited a wide linear dynamic range from 0.041 to 12.4 μM. The lower detection limit of the developed sensor was 0.037 μM (8.90 ppb) using a 10 min preconcentration time. The sensor showed excellent selectivity towards aluminium(III) ion over other interference ions.

  19. Organometallic neptunium(III) complexes.

    Science.gov (United States)

    Dutkiewicz, Michał S; Farnaby, Joy H; Apostolidis, Christos; Colineau, Eric; Walter, Olaf; Magnani, Nicola; Gardiner, Michael G; Love, Jason B; Kaltsoyannis, Nikolas; Caciuffo, Roberto; Arnold, Polly L

    2016-08-01

    Studies of transuranic organometallic complexes provide a particularly valuable insight into covalent contributions to the metal-ligand bonding, in which the subtle differences between the transuranium actinide ions and their lighter lanthanide counterparts are of fundamental importance for the effective remediation of nuclear waste. Unlike the organometallic chemistry of uranium, which has focused strongly on U(III) and has seen some spectacular advances, that of the transuranics is significantly technically more challenging and has remained dormant. In the case of neptunium, it is limited mainly to Np(IV). Here we report the synthesis of three new Np(III) organometallic compounds and the characterization of their molecular and electronic structures. These studies suggest that Np(III) complexes could act as single-molecule magnets, and that the lower oxidation state of Np(II) is chemically accessible. In comparison with lanthanide analogues, significant d- and f-electron contributions to key Np(III) orbitals are observed, which shows that fundamental neptunium organometallic chemistry can provide new insights into the behaviour of f-elements.

  20. Globalización: aspectos políticos, económicos y sociales

    Directory of Open Access Journals (Sweden)

    Jambell García

    2010-01-01

    Full Text Available En el artículo se exploran las dimensiones políticas, económicas y sociales del proceso de globalización. La revisión documental, bibliográfica y hemerográfica, permite identificar los aspectos que involucra este fenómeno mundial. Como resultado se observa que mientras persista el actual esquema de reproducción capitalista a escala global, la globalización tenderá a favorecer más a un pequeño grupo de países altamente desarrollados, en detrimento de la mayoría de la población del planeta, haciendo difícil superar los retos del desarrollo humano. Se concluye la necesidad de un cambio de paradigma y de comportamiento por parte de la sociedad para alcanzar un desarrollo económico y social equitativo.

  1. Game, game, game and again game, de Jason Nelson: aspectos da contemporaneidade

    Directory of Open Access Journals (Sweden)

    Flavio Pereira Senra

    2016-01-01

    Full Text Available Embora pensadores como o escritor Mario Vargas Llosa afirmem que os tempos hodiernos têm como característica principal a frivolidade, por conta da velocidade e quantidade de informações a serem digeridas diariamente, artistas em sua pulsão criativa exploram tais paradoxos de grandeza/pequenez em suas obras de arte. Este artigo visa apreender na obra Game, game, game and again game aspectos da contemporaneidade, como o conceito de lúdico e a enorme gama de entretenimentos voltados a um público imerso na indústria da cultura, através da forma como eles são trabalhados junto a conceitos como interatividade como forma de coautoria da obra de arte, finitude artística e permanência no meio digital, e transmidialidade na criação estética.

  2. Audición espacial en ambientes reverberantes: aspectos teóricos relevantes

    Directory of Open Access Journals (Sweden)

    Claudia Arias

    2003-01-01

    Full Text Available En ambientes reverberantes el sonido se propaga en múltiples direcciones sufriendo cambios físicos de importancia. El sistema auditivo debe se capaz de resolver la competencia perceptual que se produce entre el sonido original y sus reflexiones. En este artículo se presentan aspectos teóricos relevantes de la audición espacial con especial tratamiento del efecto precedente. Se trata de una estrategia inconciente que el individuo utiliza para enfrentar la información sonora conflictiva de los espacios reverberantes. Es el fenómeno perceptual de fusión espacial que ocurre cuando dos sonidos similares se presentan desde diferentes lugares, separados por un breve retardo de tiempo. El individuo escucha sólo un sonido que localiza según la dirección del sonido que llegó primero

  3. Impact of Eu(III) on mammalian cells as a function of its speciation

    Energy Technology Data Exchange (ETDEWEB)

    Sachs, Susanne; Heller, Anne; Geipel, Gerhard; Bernhard, Gert [Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstr. 400, 01328 Dresden (Germany)

    2014-07-01

    toxicity of U(VI) onto rat kidney cells [3]. In the presence of fetal bovine serum (FBS) as nutrient component, Eu(III) is stabilized in solution by complexation with serum proteins as strong complexing agents and shows a low cytotoxicity. In contrast to that, in the absence of FBS, Eu(III) forms hardly soluble species that are dominated by phosphate ligands. In this binding form, Eu(III) exerts a significantly higher cytotoxicity. The presence of an excess of citrate, as strong complexing ligand, influences the Eu(III) speciation and decreases its toxicity in the absence of FBS. Independent of its speciation, Eu(III) seems to be predominantly bound to the cell surface and does not significantly enter the cells. Under the applied experimental conditions, the tolerance of FaDu cells versus Eu(III) appears to be not significantly influenced by the presence of {sup 152}Eu, indicating no additional radio-toxic effect. (authors)

  4. Diglycolic acid modified zirconium phosphate and studies on the extraction of Am(III) and Eu(III) from dilute nitric acid medium

    Energy Technology Data Exchange (ETDEWEB)

    Selvan, B. Robert; Suneesh, A.S.; Venkatesan, K.A.; Antony, M.P. [Indira Gandhi Centre for Atomic Research, Kalpakkam (India). Fuel Chemistry Division; Dasthaiah, K.; Gardas, R.L. [Indian Institute of Technology - Madras, Chennai (India). Dept. of Chemistry

    2017-06-01

    Diglycolic acid modified zirconium phosphate (ZrP-DGA) was prepared and studied for the extraction of Am(III) and Eu(III) from dilute nitric acid medium. The distribution coefficient (K{sub d}, mL.g{sup -1}) of Am(III) and Eu(III) was measured as a function of time, pH and concentration of Eu(III) ion etc. The K{sub d} of Am(III) and Eu(III) increased with increase of pH, reached a maximum value of distribution coefficient at pH 1.5 - 2, followed by decrease in K{sub d} values. Rapid extraction of Am(III) and Eu(III) in ZrP-DGA was observed followed by the establishment of equilibrium occurred in 100 min. Kinetics of extraction was fitted in to pseudo second order rate equation. The amount of Eu(III) loaded in ZrP-DGA increased with increase in the concentration of Eu(III) ion in aqueous phase and the isotherm was fitted in to Langmuir and Freundlich adsorption models. The extraction of Am(III) in ZrP-DGA was higher as compared to Eu(III) and the interference of Eu(III) on the extraction of Am(III) was studied. The distribution coefficient of some lanthanides in ZrP-DGA was measured and the K{sub d} of lanthanides increased across the lanthanide series. The extracted trivalent metal ions were recovered in three contacts of loaded ZrP-DGA with 0.5 M nitric acid.

  5. A comprehensive study of g-factors, elastic, structural and electronic properties of III-V semiconductors using hybrid-density functional theory

    Science.gov (United States)

    Bastos, Carlos M. O.; Sabino, Fernando P.; Sipahi, Guilherme M.; Da Silva, Juarez L. F.

    2018-02-01

    Despite the large number of theoretical III-V semiconductor studies reported every year, our atomistic understanding is still limited. The limitations of the theoretical approaches to yield accurate structural and electronic properties on an equal footing, is due to the unphysical self-interaction problem that mainly affects the band gap and spin-orbit splitting (SOC) in semiconductors and, in particular, III-V systems with similar magnitude of the band gap and SOC. In this work, we report a consistent study of the structural and electronic properties of the III-V semiconductors by using the screening hybrid-density functional theory framework, by fitting the α parameters for 12 different III-V compounds, namely, AlN, AlP, AlAs, AlSb, GaN, GaP, GaAs, GaSb, InN, InP, InAs, and InSb, to minimize the deviation between the theoretical and experimental values of the band gap and SOC. Structural relaxation effects were also included. Except for AlP, whose α = 0.127, we obtained α values that ranged from 0.209 to 0.343, which deviate by less than 0.1 from the universal value of 0.25. Our results for the lattice parameter and elastic constants indicate that the fitting of α does not affect those structural parameters when compared with the HSE06 functional, where α = 0.25. Our analysis of the band structure based on the k ṡ p method shows that the effective masses are in agreement with the experimental values, which can be attributed to the simultaneous fitting of the band gap and SOC. Also, we estimate the values of g-factors, extracted directly from the band structure, which are close to experimental results, which indicate that the obtained band structure produced a realistic set of k ṡ p parameters.

  6. Quantum Calculations of Electron Tunneling in Respiratory Complex III.

    Science.gov (United States)

    Hagras, Muhammad A; Hayashi, Tomoyuki; Stuchebrukhov, Alexei A

    2015-11-19

    The most detailed and comprehensive to date study of electron transfer reactions in the respiratory complex III of aerobic cells, also known as bc1 complex, is reported. In the framework of the tunneling current theory, electron tunneling rates and atomistic tunneling pathways between different redox centers were investigated for all electron transfer reactions comprising different stages of the proton-motive Q-cycle. The calculations reveal that complex III is a smart nanomachine, which under certain conditions undergoes conformational changes gating electron transfer, or channeling electrons to specific pathways. One-electron tunneling approximation was adopted in the tunneling calculations, which were performed using hybrid Broken-Symmetry (BS) unrestricted DFT/ZINDO levels of theory. The tunneling orbitals were determined using an exact biorthogonalization scheme that uniquely separates pairs of tunneling orbitals with small overlaps out of the remaining Franck-Condon orbitals with significant overlap. Electron transfer rates in different redox pairs show exponential distance dependence, in agreement with the reported experimental data; some reactions involve coupled proton transfer. Proper treatment of a concerted two-electron bifurcated tunneling reaction at the Q(o) site is given.

  7. Post-test analysis of ROSA-III experiment Run 702

    International Nuclear Information System (INIS)

    Koizumi, Yasuo; Kikuchi, Osamu; Soda, Kunihisa

    1980-01-01

    The purpose of the ROSA-III experiment with a scaled BWR test facility is to examine primary coolant thermal-hydraulic behavior and performance of ECCS during a posturated loss-of-coolant accident of BWR. The results provide information for verification and improvement of reactor safety analysis codes. Run 702 assumed a 200% split break at the recirculation pump suction line under an average core power without ECCS activation. Post - test analysis of the Run 702 experiment was made with computer code RELAP4J. Agreement of the calculated system pressure and the experiment one was good. However, the calculated heater surface temperatures were higher than the measured ones. Also, the axial temperature distribution was different in tendency from the experimental one. From these results, the necessity was indicated of improving the analytical model of void distribution in the core and the nodalization in the pressure vassel, in order to make the analysis more realistic. And also, the need of characteristic test was indicated for ROSA-III test facility components, such as jet pump and piping form loss coefficient; likewise, flow rate measurements must be increased and refined. (author)

  8. Effect of alkali cations on two-dimensional networks of two new quaternary thioarsenates (III) prepared by a facile surfactant-thermal method

    Energy Technology Data Exchange (ETDEWEB)

    Yan, Dongming [School of Civil and Architectural Engineering, Zhejiang University, Hangzhou 310058 (China); Hou, Peipei; Liu, Chang [State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027 (China); Chai, Wenxiang [College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018 (China); Zheng, Xuerong [State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027 (China); Zhang, Luodong [School of Civil and Architectural Engineering, Zhejiang University, Hangzhou 310058 (China); Zhi, Mingjia; Zhou, Chunmei [State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027 (China); Liu, Yi, E-mail: liuyimse@zju.edu.cn [State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027 (China)

    2016-09-15

    Two new quaternary thioarsenates(III) NaAg{sub 2}AsS{sub 3}·H{sub 2}O (1) and KAg{sub 2}AsS{sub 3} (2) with high yields have been successfully prepared through a facile surfactant-thermal method. It is interesting that 2 can only be obtained with the aid of ethanediamine (en), which indicates that weak basicity of solvent is beneficial to the growth of 2 compared with 1. Both 1 and 2 feature the similar two-dimensional (2D) layer structures. However, the distortion of the primary honeycomb-like nets in 2 is more severe than that of 1, which demonstrates that Na{sup +} and K{sup +} cations have different structure directing effects on these two thioarsenates(III). Both experimental and theoretical studies confirm 1 and 2 are semiconductors with band gaps in the visible region. Our success in preparing these two quaternary thioarsenates(III) proves that surfactant-thermal technique is a powerful yet facile synthetic method to explore new complex chalcogenides. - Graphical abstract: Two new quaternary thioarsenates(III) NaAg{sub 2}AsS{sub 3}·H{sub 2}O (1) and KAg{sub 2}AsS{sub 3} (2) with high yields have been successfully prepared through a facile surfactant-thermal method. X-ray single crystal diffraction analyses demonstrate that Na{sup +} and K{sup +} cations have different structure directing effects on these two thioarsenates(III). Both experimental and theoretical studies confirm 1 and 2 are semiconductors with band gaps in the visible region. Display Omitted - Highlights: • NaAg{sub 2}AsS{sub 3}⋅H{sub 2}O (1) and KAg{sub 2}AsS{sub 3} (2) were prepared through surfactant-thermal method. • Crystal structures show Na{sup ±} and K{sup ±} have different structure directing effects. • The weak basicity of solvent is benefit to the growth of 2 compared with 1. • Experimental and theoretical studies confirm 1 and 2 are semiconductors.

  9. Spin-crossover in an iron(III)-bispidine-alkylperoxide system.

    Science.gov (United States)

    Bautz, Jochen; Comba, Peter; Que, Lawrence

    2006-09-04

    The iron(II) complex of a tetradentate bispidine ligand with two tertiary amines and two pyridine groups (L = dimethyl [3,7-dimethyl-9,9'-dihydroxy-2,4-di-(2-pyridyl)-3,7-diazabicyclo nonan-1,5-dicaboxylate]) is oxidized with tert-butyl hydroperoxide to the corresponding end-on tert-butylperoxo complex [Fe(III)(L)(OOtBu)(X)]n+ (X = solvent, anion). UV-vis, resonance Raman, and EPR spectroscopy, as a function of the solvent, show that this is a spin-crossover compound. The experimentally observed Raman vibrations for both low-spin and high-spin isomers are in good agreement with those computed by DFT.

  10. Simultaneous removal of Ni(II), As(III), and Sb(III) from spiked mine effluent with metakaolin and blast-furnace-slag geopolymers.

    Science.gov (United States)

    Luukkonen, Tero; Runtti, Hanna; Niskanen, Mikko; Tolonen, Emma-Tuulia; Sarkkinen, Minna; Kemppainen, Kimmo; Rämö, Jaakko; Lassi, Ulla

    2016-01-15

    The mining industry is a major contributor of various toxic metals and metalloids to the aquatic environment. Efficient and economical water treatment methods are therefore of paramount importance. The application of natural or low-cost sorbents has attracted a great deal of interest due to the simplicity of its process and its potential effectiveness. Geopolymers represent an emerging group of sorbents. In this study, blast-furnace-slag and metakaolin geopolymers and their raw materials were tested for simultaneous removal of Ni(II), As(III) and Sb(III) from spiked mine effluent. Blast-furnace-slag geopolymer proved to be the most efficient of the studied materials: the experimental maximum sorption capacities for Ni, As and, Sb were 3.74 mg/g, 0.52 mg/g, and 0.34 mg/g, respectively. Although the capacities were relatively low due to the difficult water matrix, 90-100% removal of Ni, As, and Sb was achieved when the dose of sorbent was increased appropriately. Removal kinetics fitted well with the pseudo-second-order model. Our results indicate that geopolymer technology could offer a simple and effective way to turn blast-furnace slag to an effective sorbent with a specific utilization prospect in the mining industry. Copyright © 2015 Elsevier Ltd. All rights reserved.

  11. Adsorption of La(III) onto GMZ bentonite. Effect of contact time, bentonite content, pH value and ionic strength

    International Nuclear Information System (INIS)

    Yonggui Chen; Changsha University of Science and Technology, Changsha; Chunming Zhu; Weimin Ye; Yanhong Sun; Huiying Duan; Dongbei Wu

    2012-01-01

    Bentonite has been studied extensively because of its strong adsorption capacity. A local Na-bentonite named GMZ bentonite, collected from Gaomiaozi County (Inner Mongolia, China), was selected as the first choice of buffer/backfill material for the high-level radioactive waste repository in China. In this research, the adsorption of La (III) onto GMZ bentonite was performed as a function of contact time, pH, solid content and metal ion concentrations by using the batch experiments. The results indicate that the adsorption of La (III) on GMZ bentonite achieves equilibration quickly and the kinetic adsorption follows the pseudo-second-order model; the adsorption of La (III) on the adsorbent is strongly dependent on pH and solid content, the adsorption process follows Langmuir isotherm. The equilibrium batch experiment data demonstrate that GMZ bentonite is effective adsorbent for the removal of La (III) from aqueous solution with the maximum adsorption capacity of 26.8 mg g -1 under the given experimental conditions. (author)

  12. Prediction of ROSA-III experiment Run 702

    International Nuclear Information System (INIS)

    Koizumi, Yasuo; Soda, Kunihisa; Kikuchi, Osamu.

    1978-11-01

    The purpose of the ROSA-III experiment with a scaled BWR test facility is to examine primary coolant thermalhydraulic behavior and performance during a postulated loss-of-coolant accident of BWR. The results provide information for verification and improvement of reactor safety analysis codes. Run 702 assumes a recirculation line double ended break at the pump suction with average core power and no ECCS. Prediction of the Run 702 experiment was made with computer code RELAP-4J. What determine the coolant behavior are mixture level in the downcomer and flowrates and flow directions at jet pump drive flow nozzle, jet pump suction and discharge. There is thus the need for these measurements to compare predicted results with experimental ones. The liquid level formation model also needs improvement. (author)

  13. Triglyceride-rich lipoprotein metabolism in women: roles of apoC-II and apoC-III.

    Science.gov (United States)

    Ooi, Esther M; Chan, Dick C; Hodson, Leanne; Adiels, Martin; Boren, Jan; Karpe, Fredrik; Fielding, Barbara A; Watts, Gerald F; Barrett, P Hugh R

    2016-08-01

    Experimental data suggest that apolipoprotein (apo) C-II and C-III regulate triglyceride-rich lipoprotein (TRL) metabolism, but there are limited studies in humans. We investigated the metabolic associations of TRLs with apoC-II and apoC-III concentrations and kinetics in women. The kinetics of plasma apoC-II, apoC-III and very low-density lipoprotein (VLDL) apoB-100 and triglycerides were measured in the postabsorptive state using stable isotopic techniques and compartmental modelling in 60 women with wide-ranging body mass index (19·5-32·9 kg/m(2) ). Plasma apoC-II and apoC-III concentrations were positively associated with the concentrations of plasma triglycerides, VLDL1 - and VLDL2 -apoB-100 and triglyceride (all P triglyceride concentration and VLDL1 triglyceride PR, while apoC-II fractional catabolic rate (FCR) was positively associated with VLDL1 triglyceride FCR (all P triglyceride kinetics. ApoC-III PR, but not FCR, was positively associated with VLDL1 triglyceride, and VLDL2 -apoB-100 and triglyceride concentrations (all P triglyceride kinetics. In multivariable analysis, including homoeostasis model assessment score, menopausal status and obesity, apoC-II concentration was significantly associated with plasma triglyceride, VLDL1 -apoB-100 and VLDL1 triglyceride concentrations and PR. Using the same multivariable analysis, apoC-III was significantly associated with plasma triglyceride and VLDL1 - and VLDL2 -apoB-100 and triglyceride concentrations and FCR. In women, plasma apoC-II and apoC-III concentrations are regulated by their respective PR and are significant, independent determinants of the kinetics and plasma concentrations of TRLs. © 2016 Stichting European Society for Clinical Investigation Journal Foundation.

  14. Radiometric titration of thallium(III) with EDTA

    International Nuclear Information System (INIS)

    Rao, V.R.S.; Pulla Rao, Ch.; Tataiah, G.

    1978-01-01

    Radioactive solutions containing very small amounts of thallium(III) can be determined by radiometric titration using ammonia as hydrolysing agent. Aqueous solution of thallium(I) (both inactive and radioactive) is treated with bromine water till the appearance of the brown colour of bromine, and the solution is warmed to 80 deg C to expel the excess bromine. By this procedure all thallium(I) is quantitatively oxidised to thallium(III). An aqueous solution of ammonia is added to precipitate thallium(III) as thallic oxide. It is then filtered, washed with water to free it from bromide and then dissolved in 2N HCl and the solution is then standardised. 2 ml of this solution is transferred to a 20 ml volumetric flask, 1 ml of radioactive thallium(III) solution to be standardised is added as well as incremental amounts of EDTA solution and mixed thoroughly. Uncomplexed thallium(III) is then precipitated by the addition of an ammonia solution and diluted to 20 ml. Required amount of this mixture is centrifuged. The beta activity of the supernatant aliquot is measured using a GM counter. Quantitative determination of Tl(III) in the range of 1-10 μM can be carried out. The interference of cations such as Au(III), iron(III), Ga(III) can be eliminated by pretreatment of the Tl(III) solution before carrying out radiometric titration. The results obtained are reproducible and accurate to +-3%. (T.I.)

  15. Single-molecule magnetism in three related {Co(III)2Dy(III)2}-acetylacetonate complexes with multiple relaxation mechanisms.

    Science.gov (United States)

    Langley, Stuart K; Chilton, Nicholas F; Moubaraki, Boujemaa; Murray, Keith S

    2013-06-17

    Three new heterometallic complexes with formulas of [Dy(III)2Co(III)2(OMe)2(teaH)2(acac)4(NO3)2] (1), [Dy(III)2Co(III)2(OH)2(teaH)2(acac)4(NO3)2]·4H2O (2), and [Dy(III)2Co(III)2(OMe)2(mdea)2(acac)4(NO3)2] (3) were characterized by single-crystal X-ray diffraction and by dc and ac magnetic susceptibility measurements. All three complexes have an identical "butterfly"-type metallic core that consists of two Dy(III) ions occupying the "body" position and two diamagnetic low-spin Co(III) ions occupying the outer "wing-tips". Each complex displays single-molecule magnet (SMM) behavior in zero applied magnetic field, with thermally activated anisotropy barriers of 27, 28, and 38 K above 7.5 K for 1-3, respectively, as well as observing a temperature-independent mechanism of relaxation below 5 K for 1 and 2 and at 3 K for 3, indicating fast quantum tunneling of magnetization (QTM). A second, faster thermally activated relaxation mechanism may also be active under a zero applied dc field as derived from the Cole-Cole data. Interestingly, these complexes demonstrate further relaxation modes that are strongly dependent upon the application of a static dc magnetic field. Dilution experiments that were performed on 1, in the {Y(III)2Co(III)2} diamagnetic analog, show that the slow magnetic relaxation is of a single-ion origin, but it was found that the neighboring ion also plays an important role in the overall relaxation dynamics.

  16. III-V microelectronics

    CERN Document Server

    Nougier, JP

    1991-01-01

    As is well known, Silicon widely dominates the market of semiconductor devices and circuits, and in particular is well suited for Ultra Large Scale Integration processes. However, a number of III-V compound semiconductor devices and circuits have recently been built, and the contributions in this volume are devoted to those types of materials, which offer a number of interesting properties. Taking into account the great variety of problems encountered and of their mutual correlations when fabricating a circuit or even a device, most of the aspects of III-V microelectronics, from fundamental p

  17. Antithrombin III for critically ill patients

    DEFF Research Database (Denmark)

    Allingstrup, Mikkel; Wetterslev, Jørn; Ravn, Frederikke B

    2016-01-01

    PURPOSE: Antithrombin III (AT III) is an anticoagulant with anti-inflammatory properties. We assessed the benefits and harms of AT III in critically ill patients. METHODS: We searched from inception to 27 August 2015 in CENTRAL, MEDLINE, EMBASE, CAB, BIOSIS and CINAHL. We included randomized...... participants). However, for all other outcome measures and analyses, the results did not reach statistical significance. CONCLUSIONS: There is insufficient evidence to support AT III substitution in any category of critically ill participants including those with sepsis and DIC. AT III did not show an impact...

  18. History of HERMES III diode to z-pinch breakthrough and beyond :

    Energy Technology Data Exchange (ETDEWEB)

    Sanford, Thomas Williamlou.

    2013-04-01

    HERMES III and Z are two flagship accelerators of Sandias pulsed-power program developed to generate intense -ray fields for the study of nuclear radiation effects, and to explore high energy-density physics (including the production of intense x-ray fields for Inertia Confinement Fusion [ICF]), respectively. A diode at the exit of HERMES III converts its 20-MeV electron beam into -rays. In contrast, at the center of Z, a z-pinch is used to convert its 20-MA current into an intense burst of x-rays. Here the history of how the HERMES III diode emerged from theoretical considerations to actual hardware is discussed. Next, the reverse process of how the experimental discovery of wire-array stabilization in a z-pinch, led to a better theory of wirearray implosions and its application to one of the ICF concepts on Z--the DH (Dynamic Hohlraum) is reviewed. Lastly, the report concludes with how the unexpected axial radiation asymmetry measured in the DH is understood. The first discussion illustrates the evolution of physics from theory-to-observationto- refinement. The second two illustrate the reverse process of observationto- theory-to refinement. The histories are discussed through the vehicle of my research at Sandia, illustrating the unique environment Sandia provides for personal growth and development into a scientific leader.

  19. First-principles study of the structural and electronic properties of III-phosphides

    Energy Technology Data Exchange (ETDEWEB)

    Ahmed, Rashid [Centre for High Energy Physics, University of the Punjab, Lahore 54590 (Pakistan)], E-mail: rasofi@hotmail.com; Fazal-e-Aleem [Centre for High Energy Physics, University of the Punjab, Lahore 54590 (Pakistan); Hashemifar, S. Javad; Akbarzadeh, Hadi [Department of Physics, Isfahan University of Technology, Isfahan 84156 (Iran, Islamic Republic of)

    2008-05-01

    We use density functional theory and different forms of the exchange-correlation approximation to calculate the structural and electronic properties of tetrahedrally coordinated III-phosphide semiconductors. The computed results for structural properties using generalized gradient approximation (GGA) agree well with the experimental data. For reliable description of energy band gap values, another form of GGA developed by Engel and Vosko has been applied. As anticipated, boron phosphide was found to be the hardest compound due to the strong B-P covalent bonding.

  20. A view from Cheyenne Mountain: Generation III's perspective of Keystone III.

    Science.gov (United States)

    Bliss, Erika; Cadwallader, Kara; Steyer, Terrence E; Clements, Deborah S; Devoe, Jennifer E; Fink, Kenneth; Khubesrian, Marina; Lyons, Paul; Steiner, Elizabeth; Weismiller, David

    2014-01-01

    In October 2000 the family of family medicine convened the Keystone III conference at Cheyenne Mountain Resort. Keystone III participants included members of Generation I (entered practice before 1970), Generation II (entered 1970-1990), and Generation III (entered after 1990). They represented a wide range of family physicians, from medical students to founders of the discipline, and from small-town solo practice to academic medicine. During the conference, the three generations worked together and separately thinking about the past, present, and future of family medicine, our roles in it, and how the understanding of a family physician and our discipline had and would continue to evolve. After the conference, the 10 Generation III members wrote the article published here, reflecting on our experiences as new physicians and physicians in training, and the similarities and differences between our experiences and those of physicians in Generations I and II. Key similarities included commitment to whole-person care, to a wide scope of practice, to community health, and to ongoing engagement with our discipline. Key differences included our understanding of availability, the need for work-life balance, the role of technology in the physician-patient relationship, and the perceptions of the relationship between medicine and a range of outside forces such as insurance and government. This article, presented with only minor edits, thus reflects accurately our perceptions in late 2000. The accompanying editorial reflects our current perspective.

  1. Stark shift measurements of Xe II and Xe III spectral lines

    International Nuclear Information System (INIS)

    Cirisan, M; Pelaez, R J; Djurovic, S; Aparicio, J A; Mar, S

    2007-01-01

    Stark shift measurements of singly and doubly ionized Xe spectral lines are presented in this paper. Shifts of 110 Xe II lines and 42 Xe III lines are reported, including a significant number of new results. A low-pressure-pulsed arc with 95% of He and 5% of Xe was used as a plasma source. All measurements were performed under the following plasma conditions: electron density (0.2-1.4) x 10 23 m -3 and electron temperature 18 000-23 000 K. The measured Stark shifts are compared with other experimental and theoretical data

  2. Differential expression of metallothioneins in the CNS of mice with experimental autoimmune encephalomyelitis

    DEFF Research Database (Denmark)

    Espejo, C; Carrasco, J; Hidalgo, J

    2001-01-01

    Multiple sclerosis is an inflammatory, demyelinating disease of the CNS. Metallothioneins-I+II are antioxidant proteins induced in the CNS by immobilisation stress, trauma or degenerative diseases which have been postulated to play a neuroprotective role, while the CNS isoform metallothionein......-III has been related to Alzheimer's disease. We have analysed metallothioneins-I-III expression in the CNS of mice with experimental autoimmune encephalomyelitis. Moreover, we have examined the putative role of interferon-gamma, a pro-inflammatory cytokine, in the control of metallothioneins expression...

  3. Aspectos nutricionais relacionados ao ciclo menstrual Nutritional aspects related to menstrual cycle

    Directory of Open Access Journals (Sweden)

    Helena Alves de Carvalho SAMPAIO

    2002-09-01

    Full Text Available O objetivo da presente revisão é apresentar os principais tópicos discutidos na literatura quanto à associação da nutrição com o ciclo menstrual, contribuindo para a implementação do atendimento nutricional de mulheres. São revisados aspectos referentes à fisiologia da menstruação, alterações metabólicas durante o ciclo menstrual e comportamentos alimentares associados a ele. Considerando-se o ciclo menstrual dividido em duas fases, a folicular e a lútea, é nesta última que são descritas mais alterações, como retenção de água, elevação de peso, aumento de demanda energética, modificações no perfil lipídico e no metabolismo de vitamina D, cálcio, magnésio e ferro, hipersensibilidade emocional, dores generalizadas e mudança do comportamento alimentar. Em relação a este último item, podem ocorrer maior ingestão energética e o desenvolvimento de compulsões alimentares, principalmente por chocolate, doces e alimentos muito salgados. É fundamental que todos os aspectos citados sejam investigados durante a consulta nutricional, a fim de serem adotadas condutas mais específicas.The aim of the present review is to show the most important topics discussed in literature about the association between nutrition and menstrual cycle, contributing to improve the nutritional care for women. Aspects related to physiology of the menstruation, metabolic changes and feeding behavior during the menstrual cycle are reviewed. Considering the menstrual cycle divided in two phases, follicular and luteal, it is in this last one that more alterations are described, like fluid retention, weight gain, increase in caloric needs, modifications in the lipid profile and in the metabolism of vitamin D, calcium, magnesium and iron, emotional hypersensitivity, aches and changes in feeding behavior. In relation to this last item, it can occur a higher caloric intake and the development of food cravings, mainly for chocolate, candies and

  4. Aspectos psicobiológicos do comportamento alimentar Psychobiological aspects of feeding behavior

    Directory of Open Access Journals (Sweden)

    Rosana Passos Beinner Cambraia

    2004-06-01

    Full Text Available Esta revisão aborda alguns aspectos psicobiológicos ligados à manifestação do comportamento alimentar, e tem como objetivo evidenciar a relação entre os principais processos neuropsicológicos e a neurociência nutricional. Algumas estruturas neurais estão associadas ao controle alimentar por mecanismos distintos e correlatos que ocorrem no hipotálamo, hipocampo e em outras áreas como no cerebelo, bulbo olfatório, glândulas pituitária e pineal que exercem funções distintas, porém influênciam o comportamento alimentar, intermediadas geralmente por neurotransmissores comuns. Os precursores dos neuroquímicos apresentam funções específicas, sendo a influência na alimentação relevante no contexto comportamental da escolha de alimentos. Os processos sensoriais na alimentação como paladar, olfato, visão e audição interagem entre si e com outras estruturas e vias neurais, participando também do controle do apetite e da saciedade, que culminam na iniciação e no término da alimentação. A interação entre aspectos neurais no processo de consumo de alimento promove a manifestação do comportamento alimentar específico para cada espécie em seu ambiente.This review shows how some psychobiological aspects are related to feeding behavior manifestation, and has as it objective to provide evidence as to the relation between neuropsychological processes and nutritional neuroscience. Several neural structures are associated with alimentary controls, which are distinct but correlated mechanisms; for example: hypothalamus, hypocampus, cerebellum, olfactory bulb, pituitary and pineal glands, all presenting distinct functions, but affecting feeding behavior directly or indirectly through common neurotransmitters. Neurochemical precursors present specific functions and their influence on feeding is evident in behavioral food selection. The sensory processes in feeding, principally taste, olfaction, vision and hearing, interact with

  5. Antithrombin III for critically ill patients

    DEFF Research Database (Denmark)

    Allingstrup, Mikkel; Wetterslev, Jørn; Ravn, Frederikke B

    2016-01-01

    Background: Critical illness is associated with uncontrolled inflammation and vascular damage which can result in multiple organ failure and death. Antithrombin III (AT III) is an anticoagulant with anti-inflammatory properties but the efficacy and any harmful effects of AT III supplementation...... in critically ill patients are unknown. This review was published in 2008 and updated in 2015.  Objectives: To examine: 1. The effect of AT III on mortality in critically ill participants. 2. The benefits and harms of AT III. We investigated complications specific and not specific to the trial intervention......, bleeding events, the effect on sepsis and disseminated intravascular coagulation (DIC) and the length of stay in the intensive care unit (ICU) and in hospital in general.  Search methods: We searched the following databases from inception to 27 August 2015: Cochrane Central Register of Controlled Trials...

  6. Removal of chromium(III) from tannery wastewater using activated carbon from sugar industrial waste.

    Science.gov (United States)

    Fahim, N F; Barsoum, B N; Eid, A E; Khalil, M S

    2006-08-21

    Chromium is commonly found in huge quantities in tannery wastewaters. For this reason, the removal and recovery of the chromium content of tannery wastewaters is crucial for environmental protection and economic reasons. Removal and recovery of chromium were carried out by using low-cost potential adsorbents. For this purpose three types of activated carbon; C1, the waste generated from sugar industry as waste products and the others (C2, C3) are commercial granular activated carbon, were used. The adsorption process and extent of adsorption are dependent on the physical and chemical characteristics of the adsorbent, adsorbate and experimental condition. The effect of pH, particle size and different adsorbent on the adsorption isotherm of Cr(III) was studied in batch system. The sorption data fitted well with Langmuir adsorption model. The efficiencies of activated carbon for the removal of Cr(III) were found to be 98.86, 98.6 and 93 % for C1, C2 and C3, respectively. The order of selectivity is C1>C2>C3 for removal of Cr(III) from tannery wastewater. Carbon "C1" of the highest surface area (520.66 m(2)/g) and calcium content (333.3 mg/l) has the highest adsorptive capacity for removal of Cr(III). The results revealed that the trivalent chromium is significantly adsorbed on activated carbon collected from sugar industry as waste products and the method could be used economically as an efficient technique for removal of Cr(III) and purification of tannery wastewaters.

  7. Development and application of a method for Cr(III) determination in dairy products by HPLC-ICP-MS.

    Science.gov (United States)

    Hernandez, Fanny; Jitaru, Petru; Cormant, Florence; Noël, Laurent; Guérin, Thierry

    2018-02-01

    This study describes the development of an analytical approach for the determination of Cr(III) in dairy products by microwave assisted extraction, complexation in situ by ethylenediaminetetraacetate (EDTA) and high performance liquid chromatography hyphenated to inductively coupled plasma-mass spectrometry (HPLC-ICP-MS). The extraction step was optimised by using an experimental design. A limit of quantification of 38µgkg -1 dry weight (d.w.) was obtained whereas the bias (%) measured ranged from 10 to 18%. The repeatability and intermediate precision varied between 1.2-5.0% and 7.5-13.5%, respectively. The method was applied to the analysis of several dairy samples beforehand characterized in terms of Cr(VI) and total chromium (Cr total ). Cr(III) concentrations ranged from <13 to 255µgkg -1 d.w. The results showed a good agreement between Cr(III) and Cr total concentration levels. Copyright © 2017 Elsevier Ltd. All rights reserved.

  8. Aspectos históricos da vulcanização Historical aspects of vulcanization

    Directory of Open Access Journals (Sweden)

    Helson M. da Costa

    2003-06-01

    Full Text Available As borrachas, para serem convertidas em materiais úteis do ponto de vista de aplicações, precisam ser misturadas a alguns ingredientes, os quais vão lhes dar as características desejadas para, então, serem vulcanizadas. Neste artigo, os aspectos históricos da vulcanização são abordados bem como a evolução dos aditivos essenciais à maioria das formulações.Rubbers, to be turned into useful materials from the commercial applications point of view, need the addition of a few other ingredients which, upon vulcanization, will impart the desired characteristics to the material. In this paper, historical aspects of vulcanization are revised as well as the evolution of the additives used in most of the formulations.

  9. Aspectos biopsicosociales que inciden en la salud del adulto mayor Bio-psycho social aspects shattering elderly health

    OpenAIRE

    Aida Chong Daniel

    2012-01-01

    El presente trabajo trata acerca de algunos factores biosicosociales que inciden en la salud del adulto mayor, se parte del concepto de que el envejecimiento no es un proceso de causa única, sino el resultado de una compleja asociación de interacciones y modificaciones estructurales y funcionales, entre lo biológico, lo psicológico y lo socio-ambiental. Teniendo en cuenta estos elementos el objetivo de este trabajo es exponer algunos aspectos que inciden en la salud del adulto mayor, para que...

  10. Aspectos económicos del aislamiento acústico

    Directory of Open Access Journals (Sweden)

    Amarilla, Beatriz C.

    1990-12-01

    Full Text Available The general objective of this study was to analyze the soundproofing/cost ratio with different building alternatives for interior walls and floors. This technical-economic study was divided into three parts: — Dividing walls (environmental noises — Floors (impact noises — Special Solutions (double walls, floating floors, etcetera The results show that in developing countries the most costly solutions are not always the best for housing, as far as soundproofing is concerned. A good knowledge of the economic aspects related to this matter allows obtaining a good quality at a moderate cost, which is a priority in this type of country.

    El objetivo general de este trabajo fue el de analizar el comportamiento de la relación costo-aislamiento acústico en soluciones constructivas alternativas para muros interiores y entrepisos. Este estudio técnico-económico comprende tres partes: * Muros divisorios (ruidos aéreos. * Entrepisos (ruidos de impacto. * Soluciones especiales (muros de doble hoja, pisos flotantes, etc. Se llega a la conclusión que, en los países en desarrollo, no siempre las mejores soluciones para la vivienda, desde el punto de vista acústico, son las de mayor costo. Conocer en profundidad los aspectos económicos de esta cuestión significa poder lograr una buena calidad con costos moderados, lo cual constituye una prioridad en este tipo de países.

  11. Addition compounds of lanthamide (III) and yttrium (III) hexafluorophosphates and N,N - dimethylformamide

    International Nuclear Information System (INIS)

    Braga, L.S.P.

    1983-01-01

    Addition compounds of lanthanide (III) and yttrium (III) hexafluorophosphates and N-N-Dimetylformamide are described to characterize the complexes, elemental analysis, melting ranges, molar conductance measurements, X-ray powder patters infrared and Raman spectra, TG and DTA curves, are studied. Information concerning the decomposition of the adducts through the thermogravimetric curves and the differential thermal analysis curves is obtained. (M.J.C.) [pt

  12. Characterization of Fe (III)-reducing enrichment culture and isolation of Fe (III)-reducing bacterium Enterobacter sp. L6 from marine sediment.

    Science.gov (United States)

    Liu, Hongyan; Wang, Hongyu

    2016-07-01

    To enrich the Fe (III)-reducing bacteria, sludge from marine sediment was inoculated into the medium using Fe (OH)3 as the sole electron acceptor. Efficiency of Fe (III) reduction and composition of Fe (III)-reducing enrichment culture were analyzed. The results indicated that the Fe (III)-reducing enrichment culture with the dominant bacteria relating to Clostridium and Enterobacter sp. had high Fe (III) reduction of (2.73 ± 0.13) mmol/L-Fe (II). A new Fe (III)-reducing bacterium was isolated from the Fe (III)-reducing enrichment culture and identified as Enterobacter sp. L6 by 16S rRNA gene sequence analysis. The Fe (III)-reducing ability of strain L6 under different culture conditions was investigated. The results indicated that strain L6 had high Fe (III)-reducing activity using glucose and pyruvate as carbon sources. Strain L6 could reduce Fe (III) at the range of NaCl concentrations tested and had the highest Fe (III) reduction of (4.63 ± 0.27) mmol/L Fe (II) at the NaCl concentration of 4 g/L. This strain L6 could reduce Fe (III) with unique properties in adaptability to salt variation, which indicated that it can be used as a model organism to study Fe (III)-reducing activity isolated from marine environment. Copyright © 2015 The Society for Biotechnology, Japan. Published by Elsevier B.V. All rights reserved.

  13. Simultaneous Oxidation and Sequestration of As(III) from Water by Using Redox Polymer-Based Fe(III) Oxide Nanocomposite.

    Science.gov (United States)

    Zhang, Xiaolin; Wu, Mengfei; Dong, Hao; Li, Hongchao; Pan, Bingcai

    2017-06-06

    Water decontamination from As(III) is an urgent but still challenging task. Herein, we fabricated a bifunctional nanocomposite HFO@PS-Cl for highly efficient removal of As(III), with active chlorine covalently binding spherical polystyrene host for in situ oxidation of As(III) to As(V), and Fe(III) hydroxide (HFO) nanoparticles (NPs) embedded inside for specific As(V) removal. HFO@PS-Cl could work effectively in a wide pH range (5-9), and other substances like sulfate, chloride, bicarbonate, silicate, and humic acid exert insignificant effect on As(III) removal. As(III) sequestration is realized via two pathways, that is, oxidation to As(V) by the active chlorine followed by specific As(V) adsorption onto HFO NPs, and As(III) adsorption onto HFO NPs followed by oxidation to As(V). The exhausted HFO@PS-Cl could be refreshed for cyclic runs with insignificant capacity loss by the combined regeneration strategy, that is, alkaline solution to rinse the adsorbed As(V) and NaClO solution to renew the host oxidation capability. In addition, fixed-bed experiments demonstrated that the HFO@PS-Cl column could generate >1760 bed volume (BV) effluent from a synthetic As(III)-containing groundwater to meet the drinking water standard (nanocomposites, HFO@PS-N and HFO@D201 could only generate 450 and 600 BV effluents under otherwise identical conditions.

  14. Rationalization of paclitaxel insensitivity of yeast β-tubulin and human βIII-tubulin isotype using principal component analysis

    Directory of Open Access Journals (Sweden)

    Das Lalita

    2012-08-01

    Full Text Available Abstract Background The chemotherapeutic agent paclitaxel arrests cell division by binding to the hetero-dimeric protein tubulin. Subtle differences in tubulin sequences, across eukaryotes and among β-tubulin isotypes, can have profound impact on paclitaxel-tubulin binding. To capture the experimentally observed paclitaxel-resistance of human βIII tubulin isotype and yeast β-tubulin, within a common theoretical framework, we have performed structural principal component analyses of β-tubulin sequences across eukaryotes. Results The paclitaxel-resistance of human βIII tubulin isotype and yeast β-tubulin uniquely mapped on to the lowest two principal components, defining the paclitaxel-binding site residues of β-tubulin. The molecular mechanisms behind paclitaxel-resistance, mediated through key residues, were identified from structural consequences of characteristic mutations that confer paclitaxel-resistance. Specifically, Ala277 in βIII isotype was shown to be crucial for paclitaxel-resistance. Conclusions The present analysis captures the origin of two apparently unrelated events, paclitaxel-insensitivity of yeast tubulin and human βIII tubulin isotype, through two common collective sequence vectors.

  15. The spectrometer PERKEO III and the decay of free neutrons; Das Spektrometer PERKEO III und der Zerfall des freien Neutrons

    Energy Technology Data Exchange (ETDEWEB)

    Maerkisch, B.M.

    2006-10-18

    The Standard Model of particle physics describes neutron decay with three parameters. In contrast to that, a multitude of observables are accessible experimentally. With precision measurements sensitive tests of the Standard Model are thus possible. The neutron decay spectrometer PERKEO III was designed and built as part of this work. It will replace its predecessor PERKEO II, which has reached its systematical and statistical limits. With the new instrument measurements with continuous and pulsed neutron beams become feasible. This either provides an increase in statistics of up to two orders of magnitude, or eliminates the two major instrument specific sources of systematical corrections. In our first measurement in winter 2006/2007, the available event rate will be used to determine weak magnetism from the electron asymmetry A. Previously, this value was not statistically accessible in neutron decay. Systematics are analyzed with the help of our measurement with PERKEO II. For this measurement PERKEO III will be installed at the neutron guide H113 at the Institute Laue-Langevin, Grenoble. The neutron beam from this guide is characterized and a model is given, which allows the rapid calculation of beam profiles and absolute event rates from such a beam. In preparation of a future neutron decay instrument the reflective properties of two non-magnetic neutron mirrors were measured. (orig.)

  16. Fusion Power Demonstration III

    International Nuclear Information System (INIS)

    Lee, J.D.

    1985-07-01

    This is the third in the series of reports covering the Fusion Power Demonstration (FPD) design study. This volume considers the FPD-III configuration that incorporates an octopole end plug. As compared with the quadrupole end-plugged designs of FPD-I and FPD-II, this octopole configuration reduces the number of end cell magnets and shortens the minimum ignition length of the central cell. The end-cell plasma length is also reduced, which in turn reduces the size and cost of the end cell magnets and shielding. As a contiuation in the series of documents covering the FPD, this report does not stand alone as a design description of FPD-III. Design details of FPD-III subsystems that do not differ significantly from those of the FPD-II configuration are not duplicated in this report

  17. The amide III vibrational circular dichroism band as a probe to detect conformational preferences of alanine dipeptide in water.

    Science.gov (United States)

    Mirtič, Andreja; Merzel, Franci; Grdadolnik, Jože

    2014-07-01

    The conformational preferences of blocked alanine dipeptide (ADP), Ac-Ala-NHMe, in aqueous solution were studied using vibrational circular dichroism (VCD) together with density functional theory (DFT) calculations. DFT calculations of three most representative conformations of ADP surrounded by six explicit water molecules immersed in a dielectric continuum have proven high sensitivity of amide III VCD band shape that is characteristic for each conformation of the peptide backbone. The polyproline II (PII ) and αR conformation of ADP are associated with a positive VCD band while β conformation has a negative VCD band in amide III region. Knowing this spectral characteristic of each conformation allows us to assign the experimental amide III VCD spectrum of ADP. Moreover, the amide III region of the VCD spectrum was used to determine the relative populations of conformations of ADP in water. Based on the interpretation of the amide III region of VCD spectrum we have shown that dominant conformation of ADP in water is PII which is stabilized by hydrogen bonded water molecules between CO and NH groups on the peptide backbone. Copyright © 2014 Wiley Periodicals, Inc.

  18. Gd(III)-nanodiamond conjugates for MRI contrast enhancement

    Science.gov (United States)

    Manus, Lisa M.; Mastarone, Daniel J.; Waters, Emily A.; Zhang, Xue-Qing; Schultz-Sikma, Elise A.; MacRenaris, Keith W.; Ho, Dean

    2010-01-01

    A Gd(III)-nanodiamond conjugate [Gd(III)-ND] was prepared and characterized, enabling detection of nanodiamonds by MR imaging. The Gd(III)-ND particles significantly reduced the T1 of water protons with a per-Gd(III) relaxivity of 58.82 ± 1.18 mM−1s−1 at 1.5 Tesla (60 MHz). This represents a tenfold increase compared to the monomer Gd(III) complex (r1 = 5.42 ± 0.20 mM−1s−1) and is among the highest per-Gd(III) relaxivities reported. PMID:20038088

  19. Aspectos negativos no modelo de reporte proposto pela GRI: a opinião das organizações que reportam

    Directory of Open Access Journals (Sweden)

    Thiago Ferreira-Quilice

    2015-12-01

    Full Text Available RESUMO O objetivo neste estudo foi identificar aspectos negativos no modelo de reporte proposto pelo Global Reporting Initiative (GRI, na opinião dos funcionários responsáveis pelo reporte. A importância deste estudo reside no fato de que poucos trabalhos investigam os relatórios de sustentabilidade a partir desse ponto de vista, e por oferecer ao GRI pontos específicos para serem melhorados. A pesquisa foi conduzida por meio da análise de conteúdo das respostas de 27 empresas à seguinte questão: que aspectos negativos você identifica no modelo de reporte proposto pelo GRI? Essa questão foi enviada a todas as empresas brasileiras que publicaram o relatório GRI, referente ao ano-base 2010, entre os anos 2011 e 2013. Como resultado, os respondentes consideraram que as empresas têm dificuldade em entender o modelo proposto pelo GRI, o qual foi considerado complexo, ambíguo e flexível demais, o que dificulta a padronização e a comparação entre os relatórios. Esse fato tem implicações para o GRI, que poderia propor uma metodologia mais simples e menos flexível.

  20. ASPECTOS DA PRODUÇÃO CIENTÍFICA SOBRE CONTROLE GERENCIAL

    Directory of Open Access Journals (Sweden)

    Cleyton de Oliveira Ritta

    2017-09-01

    Full Text Available O objetivo geral da pesquisa é avaliar aspectos da produção científica sobre controle gerencial na perspectiva da contabilidade gerencial nos periódicos internacionais da base de dados da Web of Science, disponíveis até 2014. A pesquisa caracteriza-se como descritiva com abordagem quantitativa por meio de estudo bibliométrico. Os procedimentos de coleta resultaram em 32 artigos disponíveis em 8 periódicos. Os resultados da pesquisa mostraram que: maioria dos artigos foi do tipo empírico e de natureza exploratória. O foco das pesquisas tem como temas a funcionalidade de artefatos contábeis e da estrutura do sistema de controle gerencial. A teoria da Contingência foi a principal base teórica do constructo dos artigos. Conclui-se que as pesquisas sobre controle gerencial possuem amplo campo de assuntos para futuras pesquisas. Os fenômenos organizacionais contemporâneos e as novas estruturas organizacionais demandam por estudos exploratórios para compreender a função do sistema de controle gerencial na condução dos negócios.

  1. Timely management of developing class III malocclusion

    Directory of Open Access Journals (Sweden)

    M R Yelampalli

    2012-01-01

    Full Text Available Timing of orthodontic treatment, especially for children with developing class III malocclusions, has always been somewhat controversial, and definitive treatment tends to be delayed for severe class III cases. Developing class III patients with moderate to severe anterior crossbite and deep bite may need early intervention in some selected cases. Class III malocclusion may develop in children as a result of an inherent growth abnormality, i.e. true class III malocclusion, or as a result of premature occlusal contacts causing forward functional shift of the mandible, which is known as pseudo class III malocclusion. These cases, if not treated at the initial stage of development, interfere with normal growth of the jaw bases and may result in severe facial deformities. The treatment should be carried out as early as possible for permitting normal growth of the skeletal bases. This paper deals with the selection of an appropriate appliance from the various current options available for early intervention in developing class III malocclusion through two case reports.

  2. Experimental Adsorption Isotherm of Methane onto Activated Carbon at Sub- and Supercritical Temperatures

    KAUST Repository

    Rahman, Kazi Afzalur; Loh, Wai Soong; Yanagi, Hideharu; Chakraborty, Anutosh; Saha, Bidyut Baran; Chun, Won Gee; Ng, Kim Choon

    2010-01-01

    This paper presents the experimentally measured adsorption isotherm data for methane onto the pitch-based activated carbon type Maxsorb III for temperatures ranging from (120 to 220) K and pressures up to 1.4 MPa. These data are useful to study

  3. Experimental measurement of the refrigerant temperature of the TRIGA Mark III reactor of the ININ

    International Nuclear Information System (INIS)

    Gallardo S, L.F.; Alonso V, G.

    1991-08-01

    With the object of knowing the axial temperature profile of the refrigerant in the core of the TRIGA Mark III reactor of the ININ, the temperatures of this, at the enter, in the center and the exit of the core were measured, in the positions: west 2, north 2 and south 1. This was made by means of the thermo pars introduction mounted in aluminum guides, connected to a measurer of digital temperature, whose resolution is of ± 0.1 C. The measurements showed a bigger heating of the refrigerant in the superior half of the core, that which suggests that the axial profile of temperature of the reactor is not symmetrical with respect to the center or that those temperature measurements in the center are not correct. (Author)

  4. Hybrid III-V/silicon lasers

    Science.gov (United States)

    Kaspar, P.; Jany, C.; Le Liepvre, A.; Accard, A.; Lamponi, M.; Make, D.; Levaufre, G.; Girard, N.; Lelarge, F.; Shen, A.; Charbonnier, P.; Mallecot, F.; Duan, G.-H.; Gentner, J.-.; Fedeli, J.-M.; Olivier, S.; Descos, A.; Ben Bakir, B.; Messaoudene, S.; Bordel, D.; Malhouitre, S.; Kopp, C.; Menezo, S.

    2014-05-01

    The lack of potent integrated light emitters is one of the bottlenecks that have so far hindered the silicon photonics platform from revolutionizing the communication market. Photonic circuits with integrated light sources have the potential to address a wide range of applications from short-distance data communication to long-haul optical transmission. Notably, the integration of lasers would allow saving large assembly costs and reduce the footprint of optoelectronic products by combining photonic and microelectronic functionalities on a single chip. Since silicon and germanium-based sources are still in their infancy, hybrid approaches using III-V semiconductor materials are currently pursued by several research laboratories in academia as well as in industry. In this paper we review recent developments of hybrid III-V/silicon lasers and discuss the advantages and drawbacks of several integration schemes. The integration approach followed in our laboratory makes use of wafer-bonded III-V material on structured silicon-on-insulator substrates and is based on adiabatic mode transfers between silicon and III-V waveguides. We will highlight some of the most interesting results from devices such as wavelength-tunable lasers and AWG lasers. The good performance demonstrates that an efficient mode transfer can be achieved between III-V and silicon waveguides and encourages further research efforts in this direction.

  5. Use of Fe(III) oxalate for oxidativewastewater treatment; Einsatz von Fe(III)-Oxalat zur chemisch-oxidativen Abwasserbehandlung

    Energy Technology Data Exchange (ETDEWEB)

    Kim, S.M.; Vogelpohl, A. [Clausthal Univ., Clausthal-Zellerfeld (Germany). Inst. fuer Thermische Verfahrenstechnik

    1998-08-01

    Iron(III)-oxalate was used as an iron catalyst for the Photo Fenton reaction. Iron(III) oxalations ([Fe(C{sub 2}O{sub 4}){sub 3}]{sup 3-}) are reduced to Fe(II) by irradiation using near UV-light ({lambda} = 300 - 400 nm) or visible light ({lambda} > 400 nm). At the same time, CO{sub 2}{sup -} or C{sub 2}O{sub 4}{sup -}-radicals originate, which cause the secondary reduction of Fe(III) to Fe(II). By means of the photolytically regenerated Fe(II) ions, hydroxyl radicals are increasingly formed, so that the degradation of organic substances is accelerated. The work aimed to assess the catalytic effect of Fe(III) oxalate for photochemical oxidation processes and to establish the parameters influencing further treatment of leachate from a municipal waste sanitary landfill by means of technical-scale experiments. (orig.) [Deutsch] In der vorliegenden Arbeit wurde Eisen(III)-Oxalat als Eisenkatalysator fuer die Photo-Fenton-Reaktion eingesetzt. Eisen(III)-Oxalationen ([Fe(C{sub 2}O{sub 4}){sub 3}]{sup 3-}) werden durch Strahlung mit nahem UV-Licht ({lambda}=300 bis 400 nm) oder mit sichtbarem Licht ({lambda}>400 nm) zu Fe(II) reduziert. Gleichzeitig entstehen CO{sub 2}{sup .-} oder C{sub 2}O{sub 4}{sup .-}-Radikale, die eine sekundaere Reduktion von Fe(III) zu Fe(II) bewirken. Mit Hilfe der photolytiisch regenerierten Fe(II)-Ionen werden vermehrt Hydroxylradikale gebildet und damit die Abbaugeschwindigkeit der organischen Substanzen beschleunigt. Ziel der hier vorgestellten Arbeit war es, die katalytische Wirkung von Fe(III)-Oxalat fuer photochemische Oxidationsverfahren abzuschaetzen und die Einflussparameter zur weitergehenden Behandlung eines Deponiesickerwassers aus Hausmuelldeponie anhand von Technikumsversuchen zu ermitteln. (orig.)

  6. Aspectos clínico-patológicos e controle da paratuberculose em rebanho bovino leiteiro

    Directory of Open Access Journals (Sweden)

    Elise M Yamasaki

    2010-11-01

    Full Text Available A paratuberculose ou doença de Johne é uma enterite granulomatosa causada por Mycobacterium avium subsp. paratuberculosis. Descrevem-se os aspectos epidemiológicos, clínico-patológicos e laboratoriais da paratuberculose em rebanho bovino leiteiro no município de Rio Claro, região Sul do Estado do Rio de Janeiro. No período de 2006 a 2009, oito vacas adultas da raça Girolanda apresentaram diarreia crônico-intermitente e perda progressiva de peso. À necropsia, observaram-se linfonodos mesentéricos aumentados de volume e úmidos ao corte, vasos linfáticos subserosos das alças intestinais proeminentes, serosa do intestino com aspecto anelado e cerebroide e a mucosa espessada, pregueada e com aspecto microgranular. À microscopia havia, desde o duodeno até o reto, inflamação granulomatosa difusa, marcada dilatação dos vasos linfáticos no ápice das vilosidades, linfangiectasia e linfangite granulomatosa na submucosa, muscular e serosa. A inflamação granulomatosa também foi vista nos linfonodos mesentéricos. A coloração de Ziehl-Neelsen revelou variável quantidade de bacilos álcool-ácido resistentes no interior de macrófagos, de células gigantes de Langhans e livres na mucosa e submucosa dos intestinos delgado e grosso e em linfonodos mesentéricos. Em alguns animais, a lâmina própria da mucosa, principalmente do jejuno e íleo exibia acentuada hipertrofia. Mycobacterium avium subsp. paratuberculosis foi isolado em cultivo bacteriano de Herrold com micobactina, a partir de amostras de fezes, de raspado de mucosa intestinal e de leite e identificado pela técnica de PCR IS900. Através da avaliação sorológica semestral, foram analisadas 298 vacas do mesmo rebanho a partir de três anos de idade, observou-se cerca de 40% de animais reagentes ao teste ELISA indireto no período estudado. O diagnóstico da paratuberculose foi baseado nos dados clínico-patológicos, na sorologia, no isolamento e identificação do

  7. Modelización numérica y mejora del sistema de medida en una instalación experimental docente de golpe de ariete

    OpenAIRE

    Martínez Fernández, José Luis

    2016-01-01

    En el laboratorio del departamento de Ingeniería Térmica y de Fluidos se dispone de una instalación experimental de golpe de ariete en la que es conveniente revisar y mejorar el sistema de medida. Paralelamente se desarrollará un modelo numérico mediante el método de las características que reproduzca en mayor medida los fenómenos transitorios producidos. Ambos aspectos del trabajo deben converger y permitir enriquecer el contenido de las prácticas realizables en la instalación y la com...

  8. Sistema de indicadores ambientales de la Universidad Nacional (2008-2011. Aspectos de significancia: electricidad, agua, combustible y teléfono

    Directory of Open Access Journals (Sweden)

    David Benavides Ramírez

    2013-03-01

    Full Text Available Como parte de los esfuerzos ambientales llevados a cabo por la Universidad Nacional (UNA de Costa Rica, incluyendo todas sus dependencias, oficinas, centros y sedes y el Programa UNA Campus Sostenible, nuestra institución ha consolidado en el tiempo un Sistema de Indicadores Ambientales con aspectos de significancia enmarcados en un Programa de Gestión Ambiental Institucional (PGAI, el cual mide el desempeño ambiental de la institución desde 2008, generando iniciativas como la campaña “Únase al ahorro”, la cual busca disminuir la facturación de los servicios públicos. Por medio de la aplicación de esta herramienta de evaluación ambiental, la Dirección de Gestión de Calidad Ambiental (DIGECA-MINAET y la UNA han establecido una medición del desempeño ambiental de forma estandarizada e integrada en cuatro aspectos ambientales que se mencionan a continuación: • Consumo eléctrico • Consumo de agua • Consumo de combustibles • Uso del teléfono Las principales características del modelo que impulsa el PGAI se basan en los conceptos de integración y sostenibilidad, que analizan los aspectos ambientales mencionados y las actividades asociadas para su mitigación y minimización, con el fin de llegar a una ecoeficiencia en la operatividad propia de la Universidad. Recientemente, la UNA presentó la “Actualización del Plan de Gestión Ambiental Institucional” ante la DIGECA-MINAET, el cual cumple de manera satisfactoria con lo requerido por esta Dirección, según lo establecido en el Decreto Ejecutivo 36499-S-MINAET. Se debe mencionar que este proceso se ha llevado a cabo gracias a la colaboración y participación activa de toda la comunidad universitaria y que se deben redoblar esfuerzos para continuar con esta visión ambiental propia y pionera de la UNA hacia los nuevos retos ambientales.

  9. Synthesis of Er(III)/Yb(III)-doped BiF3 upconversion nanoparticles for use in optical thermometry.

    Science.gov (United States)

    Du, Peng; Yu, Jae Su

    2018-03-23

    The authors describe an ethylene glycol assisted precipitation method for synthesis of Er(III)/Yb(III)-doped BiF 3 nanoparticles (NPs) at room temperature. Under 980-nm light irradiation, the NPs emit upconversion (UC) emission of Er(III) ions as a result of a two-photon absorption process. The temperature-dependent green emissions (peaking at 525 and 545 nm) are used to establish an unambiguous relationship between the ratio of fluorescence intensities and temperature. The NPs have a maximum sensitivity of 6.5 × 10 -3  K -1 at 619 K and can be applied over the 291-691 K temperature range. The results indicate that these NPs are a promising candidate for optical thermometry. Graphical abstract Schematic of the room-temperature preparation of Er(III)/Yb(III)-doped BiF 3 nanoparticles with strongly temperature-dependent upconversion emission.

  10. Effects of a Combination Therapy of Sclerostin Antibody III and Raloxifene on Bone Formation Markers in Ovariectomized Rats

    International Nuclear Information System (INIS)

    Allam, H. I. G.

    2016-01-01

    Objective: To determine the systemic effect of sclerostin monoclonal antibody (Scl-AbIII) administration on markers of bone formation and compare it with a combination of sclerostin antibody and raloxifene. Study Design: Experimental study. Place and Duration of Study: Medical College Animal House at King Khaled University Hospital, Riyadh, Saudi Arabia, from January to November 2014. Methodology: Forty-five female rats were divided into 5 groups equally; 1 control group and 4 groups of ovariectomized (OVX) rats: control OVX rats and OVX rats treated by Scl-AbIII, raloxifene or Scl-AbIII+raloxifene one month after ovariectomy, continued for 4 weeks. At the end of treatment, serum levels of Bone Specific Alkaline Phosphatase (BSAP), alkaline phosphatase, osteocalcin, Insulin-like Growth Factor-1 (IGF-1), Parathyroid Hormone (PTH), Ca/sup 2+/ and phosphorus were measured. Uterus was weighed and body weight change was calculated. Results: Scl-AbIII or raloxifene treatment produced significant increase of serum BSAP, osteocalcin, IGF-1, PTH and Ca/sup 2+/ levels. Raloxifene, either alone or combined with Scl-AbIII attenuated the decrease in uterus wet weight, and the increase in body weight seen in OVX rats. Combination therapy of Scl-AbIII, and raloxifene produced significant increase of serum alkaline phosphatase, osteocalcin and IGF-1 levels than treatment with either Scl-AbIII or raloxifene alone. Conclusion: Combination therapy of Scl-AbIII and raloxifene is an attractive strategy to enhance bone formation and can offer better gain over treatment with either one of them alone. Confirmation of these preliminary observations must await careful long-term studies. (author)

  11. Scanning tunneling microscopy III theory of STM and related scanning probe methods

    CERN Document Server

    Güntherodt, Hans-Joachim

    1996-01-01

    Scanning Tunneling Microscopy III provides a unique introduction to the theoretical foundations of scanning tunneling microscopy and related scanning probe methods. The different theoretical concepts developed in the past are outlined, and the implications of the theoretical results for the interpretation of experimental data are discussed in detail. Therefore, this book serves as a most useful guide for experimentalists as well as for theoreticians working in the filed of local probe methods. In this second edition the text has been updated and new methods are discussed.

  12. ATLAS experimental equipment. November 1983 workshop and present status

    International Nuclear Information System (INIS)

    1984-01-01

    The latest workshop was held in November 1983 with the purpose of presenting an overview of the experimental stations planned for ATLAS, describing the current status of each individual apparatus, soliciting final input on devices of the first phase (i.e. on those that will be ready when beams from ATLAS become available in late Spring of 1985), and discussing and collecting new ideas on equipment for the second phase. There were short presentations on the status of the various projects followed by informal discussions. The presentations mainly concentrated on new equipment for target area III, but included some descriptions of current apparatus in target area II that might also be of interest for experiments with the higher-energy beams available in area III. The meeting was well attended with approx. 50 scientists, approximately half of them from institutions outside Argonne. The present proceedings summarize the presentations and discussions of this one-day meeting. In addition we take the opportunity to include information about developments since this meeting and an update of the current status of the various experimental stations. We would like to emphasize again that outside-user input is extremely welcome

  13. Mechanistic basis for high stereoselectivity and broad substrate scope in the (salen)Co(III)-catalyzed hydrolytic kinetic resolution.

    Science.gov (United States)

    Ford, David D; Nielsen, Lars P C; Zuend, Stephan J; Musgrave, Charles B; Jacobsen, Eric N

    2013-10-16

    In the (salen)Co(III)-catalyzed hydrolytic kinetic resolution (HKR) of terminal epoxides, the rate- and stereoselectivity-determining epoxide ring-opening step occurs by a cooperative bimetallic mechanism with one Co(III) complex acting as a Lewis acid and another serving to deliver the hydroxide nucleophile. In this paper, we analyze the basis for the extraordinarily high stereoselectivity and broad substrate scope observed in the HKR. We demonstrate that the stereochemistry of each of the two (salen)Co(III) complexes in the rate-determining transition structure is important for productive catalysis: a measurable rate of hydrolysis occurs only if the absolute stereochemistry of each of these (salen)Co(III) complexes is the same. Experimental and computational studies provide strong evidence that stereochemical communication in the HKR is mediated by the stepped conformation of the salen ligand, and not the shape of the chiral diamine backbone of the ligand. A detailed computational analysis reveals that the epoxide binds the Lewis acidic Co(III) complex in a well-defined geometry imposed by stereoelectronic rather than steric effects. This insight serves as the basis of a complete stereochemical and transition structure model that sheds light on the reasons for the broad substrate generality of the HKR.

  14. Studies of Binary Complexes of Tripodal Ligand cis,cis-1,3,5-tris(methylaminocyclohexane with Cr(III and Fe(III

    Directory of Open Access Journals (Sweden)

    S. Esakki Muthu

    2005-01-01

    Full Text Available The formation of binary complexes of Cr(III and Fe(III with a tripodal ligand cis,cis-1,3,5-tris(methylaminocyclohexane (tmach (L has been investigated in solution. The overall stability constants of tmach with Cr(III and Fe(III were determined by potentiometric method at an ionic strength of 0.1 M NaClO4 at 25±1°C in aqueous medium. The formation of species like MLH25+, MLH4+, ML3+, ML(OH2+ and ML(OH3 were observed. Fe(III was found to form more stable complexes than Cr(III. Molecular mechanics calculations were performed to explain the mode of coordination in solution.

  15. Mechanisms for Fe(III) oxide reduction in sedimentary environments

    Science.gov (United States)

    Nevin, Kelly P.; Lovely, Derek R.

    2002-01-01

    Although it was previously considered that Fe(III)-reducing microorganisms must come into direct contact with Fe(III) oxides in order to reduce them, recent studies have suggested that electron-shuttling compounds and/or Fe(III) chelators, either naturally present or produced by the Fe(III)-reducing microorganisms themselves, may alleviate the need for the Fe(III) reducers to establish direct contact with Fe(III) oxides. Studies with Shewanella alga strain BrY and Fe(III) oxides sequestered within microporous beads demonstrated for the first time that this organism releases a compound(s) that permits electron transfer to Fe(III) oxides which the organism cannot directly contact. Furthermore, as much as 450 w M dissolved Fe(III) was detected in cultures of S. alga growing in Fe(III) oxide medium, suggesting that this organism releases compounds that can solublize Fe(III) from Fe(III) oxide. These results contrast with previous studies, which demonstrated that Geobacter metallireducens does not produce electron-shuttles or Fe(III) chelators. Some freshwater aquatic sediments and groundwaters contained compounds, which could act as electron shuttles by accepting electrons from G. metallireducens and then transferring the electrons to Fe(III). However, other samples lacked significant electron-shuttling capacity. Spectroscopic studies indicated that the electron-shuttling capacity of the waters was not only associated with the presence of humic substances, but water extracts of walnut, oak, and maple leaves contained electron-shuttling compounds did not appear to be humic substances. Porewater from a freshwater aquatic sediment and groundwater from a petroleum-contaminated aquifer contained dissolved Fe(III) (4-16 w M), suggesting that soluble Fe(III) may be available as an electron acceptor in some sedimentary environments. These results demonstrate that in order to accurately model the mechanisms for Fe(III) reduction in sedimentary environments it will be necessary

  16. Instalação de uma pequena bacia experimental florestal: estudo de caso da bacia do Rio Araponga

    Directory of Open Access Journals (Sweden)

    Aline de Almeida Mota

    Full Text Available RESUMO O presente trabalho detalha aspectos importantes a serem observados nos procedimentos de seleção e caracterização de uma bacia experimental florestal e instalação de um sistema de monitoramento hidrológico, com enfoque em fluviometria, pluviometria e tensiometria. Para tanto, utilizou-se a experiência adquirida no estudo de caso da bacia experimental do Rio Araponga (ARA, localizada no município de Rio Negrinho (SC. O levantamento dos pontos de nascentes e confluências permitiu a extração da rede de drenagem mais próxima da realidade considerando a base cartográfica disponível (escala 1:10.000. A determinação dos locais adequados dos aparelhos de monitoramento hidrológico foi possível somente com levantamento topográfico mais detalhado (escala 1:5.000.

  17. Instalação de uma pequena bacia experimental florestal: estudo de caso da bacia do Rio Araponga

    Directory of Open Access Journals (Sweden)

    Aline de Almeida Mota

    2016-10-01

    Full Text Available RESUMO O presente trabalho detalha aspectos importantes a serem observados nos procedimentos de seleção e caracterização de uma bacia experimental florestal e instalação de um sistema de monitoramento hidrológico, com enfoque em fluviometria, pluviometria e tensiometria. Para tanto, utilizou-se a experiência adquirida no estudo de caso da bacia experimental do Rio Araponga (ARA, localizada no município de Rio Negrinho (SC. O levantamento dos pontos de nascentes e confluências permitiu a extração da rede de drenagem mais próxima da realidade considerando a base cartográfica disponível (escala 1:10.000. A determinação dos locais adequados dos aparelhos de monitoramento hidrológico foi possível somente com levantamento topográfico mais detalhado (escala 1:5.000.

  18. Nitrile hydration by thiolate- and alkoxide-ligated Co-NHase analogues. Isolation of Co(III)-amidate and Co(III)-iminol intermediates.

    Science.gov (United States)

    Swartz, Rodney D; Coggins, Michael K; Kaminsky, Werner; Kovacs, Julie A

    2011-03-23

    Nitrile hydratases (NHases) are thiolate-ligated Fe(III)- or Co(III)-containing enzymes, which convert nitriles to the corresponding amide under mild conditions. Proposed NHase mechanisms involve M(III)-NCR, M(III)-OH, M(III)-iminol, and M(III)-amide intermediates. There have been no reported crystallographically characterized examples of these key intermediates. Spectroscopic and kinetic data support the involvement of a M(III)-NCR intermediate. A H-bonding network facilitates this enzymatic reaction. Herein we describe two biomimetic Co(III)-NHase analogues that hydrate MeCN, and four crystallographically characterized NHase intermediate analogues, [Co(III)(S(Me2)N(4)(tren))(MeCN)](2+) (1), [Co(III)(S(Me2)N(4)(tren))(OH)](+) (3), [Co(III)(S(Me2)N(4)(tren))(NHC(O)CH(3))](+) (2), and [Co(III)(O(Me2)N(4)(tren))(NHC(OH)CH(3))](2+) (5). Iminol-bound 5 represents the first example of a Co(III)-iminol compound in any ligand environment. Kinetic parameters (k(1)(298 K) = 2.98(5) M(-1) s(-1), ΔH(‡) = 12.65(3) kcal/mol, ΔS(‡) = -14(7) e.u.) for nitrile hydration by 1 are reported, and the activation energy E(a) = 13.2 kcal/mol is compared with that (E(a) = 5.5 kcal/mol) of the NHase enzyme. A mechanism involving initial exchange of the bound MeCN for OH- is ruled out by the fact that nitrile exchange from 1 (k(ex)(300 K) = 7.3(1) × 10(-3) s(-1)) is 2 orders of magnitude slower than nitrile hydration, and that hydroxide bound 3 does not promote nitrile hydration. Reactivity of an analogue that incorporates an alkoxide as a mimic of the highly conserved NHase serine residue shows that this moiety facilitates nitrile hydration under milder conditions. Hydrogen-bonding to the alkoxide stabilizes a Co(III)-iminol intermediate. Comparison of the thiolate versus alkoxide intermediate structures shows that C≡N bond activation and C═O bond formation proceed further along the reaction coordinate when a thiolate is incorporated into the coordination sphere.

  19. Specific Reagent for Cr(III): Imaging Cellular Uptake of Cr(III) in Hct116 Cells and Theoretical Rationalization.

    Science.gov (United States)

    Ali, Firoj; Saha, Sukdeb; Maity, Arunava; Taye, Nandaraj; Si, Mrinal Kanti; Suresh, E; Ganguly, Bishwajit; Chattopadhyay, Samit; Das, Amitava

    2015-10-15

    A new rhodamine-based reagent (L1), trapped inside the micellar structure of biologically benign Triton-X 100, could be used for specific recognition of Cr(III) in aqueous buffer medium having physiological pH. This visible light excitable reagent on selective binding to Cr(III) resulted in a strong fluorescence turn-on response with a maximum at ∼583 nm and tail of that luminescence band extended until 650 nm, an optical response that is desired for avoiding the cellular autofluorescence. Interference studies confirm that other metal ions do not interfere with the detection process of Cr(III) in aqueous buffer medium having pH 7.2. To examine the nature of binding of Cr(III) to L1, various spectroscopic studies are performed with the model reagent L2, which tend to support Cr(III)-η(2)-olefin π-interactions involving two olefin bonds in molecular probe L1. Computational studies are also performed with another model reagent LM to examine the possibility of such Cr(III)-η(2)-olefin π-interactions. Presumably, polar functional groups of the model reagent LM upon coordination to the Cr(III) center effectively reduce the formal charge on the metal ion and this is further substantiated by results of the theoretical studies. This assembly is found to be cell membrane permeable and shows insignificant toxicity toward live colon cancer cells (Hct116). Confocal laser scanning microscopic studies further revealed that the reagent L1 could be used as an imaging reagent for detection of cellular uptake of Cr(III) in pure aqueous buffer medium by Hct116 cells. Examples of a specific reagent for paramagnetic Cr(III) with luminescence ON response are scanty in the contemporary literature. This ligand design helped us in achieving the turn on response by utilizing the conversion from spirolactam to an acyclic xanthene form on coordination to Cr(III).

  20. Experimental results of two stage harmonic generation with picosecond pulses on the Stanford Mark III FEL

    International Nuclear Information System (INIS)

    Hooper, B.A.; Utah Univ., Salt Lake City; Stanford Univ., CA; Benson, S.V.; Madey, M.J.; Cutolo, A.; Naples Univ.

    1988-01-01

    We report experimental results on upper harmonic conversion using a lithium niobate and a beta barium borate crystal to quadruple the FEL light up into the visible and near infrared. The effects of finite linewidth, birefringent walk-off, and group velocity walk-off on conversion efficiency will be discussed with reference to the experimental results. (orig.)

  1. Aspectos claves relacionados con la gestión del e.Learning

    Directory of Open Access Journals (Sweden)

    Francisco Lupiáñez Villanueva

    Full Text Available La introducción y uso de las Tecnologías de la Información y la Comunicación, especialmente Internet, en el ámbito de la salud, la medicina y los sistemas sanitarios enfrenta a todos los agentes e instituciones ante numerosos retos. La educación y la formación, como actividades claves tanto de la sociedad de la información como de los sistemas sanitarios, también se ven afectadas por este proceso de cambio. La finalidad de este artículo es identificar y analizar algunos de los aspectos claves relacionados con la introducción de las TIC e Internet en el ámbito de la educación médica continuada desde el punto de vista organizacional. Esta visión nos permite combinar factores pedagógicos, tecnológicos y organizativos. Todos ellos necesarios a la hora de abordar las complejas interacciones que se producen en la implantación de un proyecto de e.Learning.

  2. Aspectos claves relacionados con la gestión del e.Learning

    Directory of Open Access Journals (Sweden)

    Francisco Lupiáñez Villanueva

    2006-12-01

    Full Text Available La introducción y uso de las Tecnologías de la Información y la Comunicación, especialmente Internet, en el ámbito de la salud, la medicina y los sistemas sanitarios enfrenta a todos los agentes e instituciones ante numerosos retos. La educación y la formación, como actividades claves tanto de la sociedad de la información como de los sistemas sanitarios, también se ven afectadas por este proceso de cambio. La finalidad de este artículo es identificar y analizar algunos de los aspectos claves relacionados con la introducción de las TIC e Internet en el ámbito de la educación médica continuada desde el punto de vista organizacional. Esta visión nos permite combinar factores pedagógicos, tecnológicos y organizativos. Todos ellos necesarios a la hora de abordar las complejas interacciones que se producen en la implantación de un proyecto de e.Learning.

  3. Aspectos estructurales del comercio fronterizo entre México y Estados Unidos

    Directory of Open Access Journals (Sweden)

    Bernardo González-Aréchiga

    1985-01-01

    Full Text Available El objetivo de esta presentación es discutir algunos aspectos estructurales de la frontera y someter a discusión la estrategia de investigación del Departamento de Estudios Económicos de CEFNOMEX. Aquí se explica cómo la frontera norte cuenta con una estructura comercial dual con patrones variables de consumo de servicios en Estados Unidos, tales como los educacionales, médicos, asistenciales, etc., que han afectado a la creación de una infraestructura local, y que la zona fronteriza del norte de México exhibe importantes distorsiones estructurales que deben estudiarse para entender sus funcionamiento económico. Es importante mejorar la base informativa con recolección directa. La investigación económica de la región requiere tanto del estudio de sus instituciones, como del monitoreo constante y cuidadoso de sus signos vitales. Una estrategia adecuada de investigación debe combinar ambos y aprovechar las complementariedades de los dos tipos de estudio.

  4. ESTUDIO DE ASPECTOS RELEVANTES DE LOS HABITANTES DE CAZUCÁ (SECTOR 4

    Directory of Open Access Journals (Sweden)

    Gregorio Clavijo Parrado

    2007-01-01

    Full Text Available Esta investigación de tipo descriptivo tuvo como objetivo general el acercamiento a la realidad social, económi - ca y demográfica de un sector de la comunidad de Cazucá, en aspectos considerados relevantes, tales como: vivienda, educación, ocupación, ingresos, gastos, edad y otros. Aunque la observación de campo se realizó en el sector cuatro de Cazucá (Soacha/Cundinamarca, se podría considerar como una muestra representativa de lo que podría estar sucediendo con el total de la comunidad. Dadas las características socioeconómicas de las familias, como unidades de observación, los resultados de - tectaron su vulnerabilidad a través de dimensiones tangibles y no tangibles relacionadas con la pobreza que, posteriormente, podrían ser objeto de indagación más profunda. Los resultados se socializarán con la comunidad y con las entidades y organismos que en Cazucá están o estén adelantando programas culturales, educativos, microempresariales y otros.

  5. Gender differences in Class III malocclusion.

    Science.gov (United States)

    Baccetti, Tiziano; Reyes, Brian C; McNamara, James A

    2005-07-01

    This study evaluated gender differences in the cephalometric records of a large-scale cross-sectional sample of Caucasian subjects with Class III malocclusion at different developmental ages. The purpose also was to provide average age-related and sex-related data for craniofacial measures in untreated Class III subjects that are used as reference in the diagnostic appraisal of the patient with Class III disharmony. The sample examined consisted of 1094 pretreatment lateral cephalometric records (557 female subjects and 537 male subjects) of Caucasian Class III individuals. The age range for female subjects was between three years six months and 57 years seven months. The male subject group ranged from three years three months to 48 years five months. Twelve age groups were identified. Skeletal maturity at different age periods also was determined using the stage of cervical vertebral maturation. Gender differences for all cephalometric variables were analyzed using parametric statistics. The findings of the study indicated that Class III malocclusion is associated with a significant degree of sexual dimorphism in craniofacial parameters, especially from the age of 13 onward. Male subjects with Class III malocclusion present with significantly larger linear dimensions of the maxilla, mandible, and anterior facial heights when compared with female subjects during the circumpubertal and postpubertal periods.

  6. Revisión de algunos aspectos importantes

    Directory of Open Access Journals (Sweden)

    J. A. Ávila

    2012-01-01

    Full Text Available El soporte nutricional adecuado y oportuno contribuye en la reducción del riesgo de infecciones, mejora la función inmune y el pronóstico del paciente; es por esto que se destaca la importancia de mantener un adecuado estado nutricional en los pacientes críticamente enfermos. Con este propósito, el presente documento resalta el valor de la nutrición parenteral y su papel en aquellos animales con desnutrición presente o prevista, siempre y cuando la vía enteral no esté disponible o sea insuficiente; esto, en razón de su metabolismo alterado, el cual predispone a un mayor catabolismo mus-cular. La correcta elaboración de un plan nutricional debe tener en cuenta aspectos de gran importancia como la evaluación integral de los hallazgos históricos, clínicos y paraclínicos, con el fin de detectar el grado o riesgo de desnutrición; por su parte, la selección del tipo de nutrición más adecuada y el tipo de solución por emplear, son variables igualmente relevantes pues varían según cada caso particular, dependiendo de la condición del paciente y el tipo de patologías asociadas. Así pues, el cálculo de los requerimientos calóricos y la manera en que estos serán suplementados, son variables que deben manejarse con cautela, con el fin de no exceder la capacidad metabólica y desencadenar complicaciones que representen mayor morbilidad y mortalidad. Por úl-timo, es importante resaltar que la nutrición parenteral debe descontinuarse tan pronto como sea posible para disminuir los problemas relacionados con la misma, como la atrofia gastrointestinal.

  7. Structural Properties of the Cr(III)-Fe(III) (Oxy)Hydroxide Compositional Series: Insights for a Nanomaterial 'Solid Solution'

    International Nuclear Information System (INIS)

    Tang, Y.; Zhang, L.; Michel, F.M.; Harrington, R.; Parise, J.B.; Reeder, R.J.

    2010-01-01

    Chromium(III) (oxy)hydroxide and mixed Cr(III)-Fe(III) (oxy)hydroxides are environmentally important compounds for controlling chromium speciation and bioaccessibility in soils and aquatic systems and are also industrially important as precursors for materials and catalyst synthesis. However, direct characterization of the atomic arrangements of these materials is complicated because of their amorphous X-ray properties. This study involves synthesis of the complete Cr(III)-Fe(III) (oxy)hydroxide compositional series, and the use of complementary thermal, microscopic, spectroscopic, and scattering techniques for the evaluation of their structural properties. Thermal analysis results show that the Cr end member has a higher hydration state than the Fe end member, likely associated with the difference in water exchange rates in the first hydration spheres of Cr(III) and Fe(III). Three stages of weight loss are observed and are likely related to the loss of surface/structural water and hydroxyl groups. As compared to the Cr end member, the intermediate composition sample shows lower dehydration temperatures and a higher exothermic transition temperature. XANES analysis shows Cr(III) and Fe(III) to be the dominant oxidation states. XANES spectra also show progressive changes in the local structure around Cr and Fe atoms over the series. Pair distribution function (PDF) analysis of synchrotron X-ray total scattering data shows that the Fe end member is nanocrystalline ferrihydrite with an intermediate-range order and average coherent domain size of ∼27 (angstrom). The Cr end member, with a coherent domain size of ∼10 (angstrom), has only short-range order. The PDFs show progressive structural changes across the compositional series. High-resolution transmission electron microscopy (HRTEM) results also show the loss of structural order with increasing Cr content. These observations provide strong structural evidence of chemical substitution and progressive structural

  8. New method for simultaneous determination of Fe(II) and Fe(III) in water using flow injection technique

    International Nuclear Information System (INIS)

    Kozak, J.; Gutowski, J.; Kozak, M.; Wieczorek, M.; Koscielniak, P.

    2010-01-01

    The method exploits the possibilities of flow injection gradient titration in a system of reversed flow with spectrophotometric detection. In the developed approach a small amount of titrant (EDTA) is injected into a stream of sample containing a mixture of indicators (sulfosalicylic acid and 1,10-phenanthroline). In acid environment sulfosalicylic acid forms a complex with Fe(III), whereas 1,10-phenanthroline forms a complex with Fe(II). Measurements are performed at wavelength λ = 530 nm when radiation is absorbed by both complexes. After injection EDTA replaces sulfosalicylic acid and forms with Fe(III) more stable colourless complex. As a result, a characteristic 'cut off' peak is registered with a width corresponding to the Fe(III) concentration and with a height corresponding to the Fe(II) concentration. Calibration was performed by titration of four two-component standard solutions of the Fe(II)/Fe(III) concentrations established in accordance with 2 2 factorial plan. The method was tested with the use of synthetic samples and then it was applied to the analysis of water samples taken from artesian wells. Under optimized experimental conditions Fe(II) and Fe(III) were determined with precision less than 0.8 and 2.5% (RSD) and accuracy less than 3.2 and 5.1% (relative error) within the concentration ranges of 0.1-3.0 and 0.9-3.5 mg L -1 of both analytes, respectively.

  9. A role of copper(II) ions in the enhancement of visible and near-infrared lanthanide(III) luminescence

    International Nuclear Information System (INIS)

    Eliseeva, Svetlana V.; Golovach, Iurii P.; Liasotskyi, Valerii S.; Antonovich, Valery P.; Petoud, Stéphane; Meshkova, Svetlana B.

    2016-01-01

    Most of the existing optical methods for Cu II detection rely on a “turn-off” approach using visible lanthanide(III) luminescence. In this work we present an innovative molecular systems where the podands bis(2-hydrazinocarbonylphenyl) ethers of ethylene glycol (L1) and diethylene glycol (L2) have been designed, synthesised and tested with an ultimate goal to create a "turn-on" lanthanide(III)-based molecular probe for the specific detection of Cu II ions based on both visible (Tb III , Eu III ) and near-infrared (Nd III , Yb III ) emission. Quantum yields of the characteristic Ln III emission signals increases by at least two-orders of magnitude upon addition of Cu II into water/acetonitrile (9/1) solutions of LnL (L=L1, L2) complexes. A detailed investigation of ligand-centred photophysical properties of water/acetonitrile (9/1) solutions of CuL, GdL and GdCuL complexes revealed that the presence of Cu II ions does not significantly affect the energy positions of the singlet (32,260 cm −1 ) and triplet (25,640–25,970 cm −1 ) states, but partially or fully eliminates the singlet state quenching through an electron transfer mechanism. This effect increases the probability of intersystem crossing leading to enhanced triplet-to-singlet emission ratio and to longer triplet state lifetimes. The redox activity of hydrazine moieties and their ability to reduce Cu II to Cu I has been indicated by a qualitative assay with neocuproine. Finally, the probe demonstrates a good selectivity towards Cu II over other transition metal ions: the addition of divalent Zn II , Cd II , Pd II , Ni II , Co II or trivalent Fe III , Ga III , In III ion salts into solutions of TbL either does not affect emission intensity or increases it to a maximum of 2–3 times, while, under similar experimental conditions, the presence of Cu II results in a 20- to 30-times lanthanide luminescence enhancement. This new strategy results in a versatile and selective optical platform for the

  10. {CoIII2DyIII2} single molecule magnet with two resolved thermal activated magnetization relaxation pathways at zero field.

    Science.gov (United States)

    Funes, Alejandro V; Carrella, Luca; Rentschler, Eva; Alborés, Pablo

    2014-02-14

    The new complex [Co(III)2Dy(III)2(OMe)2(teaH)2(Piv)6] in the {Co(III)2Dy(III)2} family, shows two well resolved thermal activated magnetization relaxation pathways under AC experiments in zero DC field. Fitted crystal field parameters suggest that the origin of these two pathways relies on two different excited mJ sub-levels.

  11. Estudo polarográfico sobre a determinação de Fe(III utilizando-se a técnica da polarografia de pulso diferencial Polarographic study about the determination of Fe(III using the technique of differencial pulse polarography

    Directory of Open Access Journals (Sweden)

    Luiz Manoel Aleixo

    2001-12-01

    Full Text Available A differential pulse polarographic study with the objective to determine iron (III in presense of copper (II in a supporting electrolyte based on citrate - EDTA was made. The best experimental conditions found were a supporting electrolyte of citrate 0.25 mol L-1, EDTA 0.050 mol L-1 and KNO3 0.50 mol L-1, pH 5.00. In this media iron (III showed a polarographic peak in -0.08 V and the copper (II in -0.34 V, both vs. Ag/AgCl (saturated KCl. Thus, a analytical method was developed and applied to determine iron (III in brass alloy, a matrix were copper is in large excess over iron. The results obtained showed no interference of copper in the iron determination. The value of 0.21% of iron in the sample alloy composition was obtained and the method was validated by atomic absortion and recovery test, and the results exhibited a good agreement with the proposed method.

  12. Outcome of tyrosinaemia type III.

    Science.gov (United States)

    Ellaway, C J; Holme, E; Standing, S; Preece, M A; Green, A; Ploechl, E; Ugarte, M; Trefz, F K; Leonard, J V

    2001-12-01

    Tyrosinaemia type III is a rare disorder caused by a deficiency of 4-hydroxyphenylpyruvate dioxygenase, the second enzyme in the catabolic pathway of tyrosine. The majority of the nine previously reported patients have presented with neurological symptoms after the neonatal period, while others detected by neonatal screening have been asymptomatic. All have had normal liver and renal function and none has skin or eye abnormalities. A further four patients with tyrosinaemia type III are described. It is not clear whether a strict low tyrosine diet alters the natural history of tyrosinaemia type III, although there remains a suspicion that treatment may be important, at least in infancy.

  13. REPRESENTAÇÕES DE UM GRUPO DE DOCENTES SOBRE DROGAS: ALGUNS ASPECTOS

    Directory of Open Access Journals (Sweden)

    Cláudia Virginia Galindo Cavalcante

    Full Text Available O abuso de drogas é atualmente um grave problema de saúde pública e a escola básica deve contribuir com a sua prevenção. O objetivo do trabalho foi identificar as representações sociais dos professores de um grupo de professores de educação básica sobre drogas. Utilizamos como instrumento de coleta de dados um formulário que continha a seguinte sentença: Para você, drogas são... , aplicado a um grupo de 75 docentes. Utilizando procedimentos da análise de conteúdo buscamos identificar alguns aspectos das representações destes profissionais. Verificamos que estes entendem drogas como algo extremamente maléfico, que produz danos muitas vezes irreversíveis. Programas de formação inicial e continuada devem levar em consideração estas representações e colaborar na ampliação destas.

  14. Aspectos históricos e socioculturais da população surda

    Directory of Open Access Journals (Sweden)

    Soraya Bianca Reis Duarte

    2013-12-01

    Full Text Available Resgata, contextualiza e caracteriza os aspectos sócio-históricos e culturais da comunidade surda que usa a Língua Brasileira de Sinais com enfoque no modelo socioantropológico. O objetivo deste estudo foi realizar a revisão bibliográfica em livros-textos e artigos científicos disponíveis na Biblioteca Virtual de Saúde, independentemente da data de publicação. Foram encontrados 102 artigos e 53 livros, dos quais 33 livros-textos e 26 artigos (quatro da base de dados Lilacs e 22 da Medline constituíram a amostra. Hoje, em contraste com o passado, há leis que asseguram o direito de comunicação e atendimento por meio da Língua Brasileira de Sinais. É urgente a repercussão, aceitação e inserção, nas políticas de saúde, do que estabelecem as leis brasileiras.

  15. The effect of diluents on the extraction of Sm(III using N,N,N’,N’-tetrabutylmalonamide

    Directory of Open Access Journals (Sweden)

    SUN SI-XIU

    2004-09-01

    Full Text Available A study has been made of the extraction of samarium(III from nitrate solutions using N,N,N’,N’-tetrabutylmalonamide (TBMA in a series of diluents. The dependence of the extraction distribution on the concentrations of aqueous nitric acid, lithium nitrate and organic TBMA was investigated. The experimental results showed that the extraction efficiency of TMBA in different diluents for Sm(III increases in the order: chloroform, carbon tetrachloride, benzene, xylene, toluene, cyclohexane, n-hexane, n-octane. The stoichiometry of the extracted species conform to Sm(NO33.3TBMA in all the employed diluents. The interaction between extractant or extracted species and diluent is discussed and a quantitative expression relating the extraction constant and the parameters of the diluent has been established.

  16. Burnable poison calculations for Mk.III gas-cooled reactor systems

    Energy Technology Data Exchange (ETDEWEB)

    Gubbins, M E

    1971-02-15

    A method of calculating the reactivity and burn-up hisotry of a Mk.III GCR system containing burnable poisons has been described. The method allows for poison-fuel interaction. Using the method it has been shown that burn-up of the poison under a constant incident flux can give errors of the order of 1-2 niles. A calculation using the method described will take about 50% longer than a straightforward fuel burn-up calculation in the same number of groups. The multi-cell approach has a potential for handling greater geometrical complexity. It is intended to compare the method against experiment as soon as suitable experimental results become available.

  17. Cuidadores de crianças com câncer: aspectos da vida afetados pela atividade de cuidador Cuidantes de niños con cáncer: aspectos de la vida afectados por la actividad de cuidar Caregivers of children with cancer: aspects of life affectcet by the caregiver role

    Directory of Open Access Journals (Sweden)

    Ana Raquel Medeiros Beck

    2007-12-01

    Full Text Available Pretendeu-se, neste estudo, descrever como as atividades relacionadas ao cuidar afetam a vida de cuidadores de crianças com câncer, o grau de dependência da criança para desempenhar as atividades de vida diária (AVD, o grau de ajuda recebida de outros e o quanto alguns aspectos da vida do cuidador são afetados pela atividade de cuidar. O estudo foi descritivo, comparativo e transversal. Foram entrevistados 50 cuidadores de crianças entre três e dez anos num hospital infantil, referência no tratamento de doenças onco-hematológicas, em Campinas, SP. As atividades relacionadas ao cuidar ocasionaram sérios prejuízos na vida dos cuidadores. Portanto, avaliar estes aspectos pode auxiliar o enfermeiro a evidenciar, amenizar e planejar a assistência aos cuidadores de crianças com câncer.Se pretendió en este estudio describir de que forma las actividades relacionadas al cuidar afectan la vida de los cuidantes de niños con cáncer, el grado de dependencia del niño para desempeñar las actividades de la vida diaria (AVD, el grado de ayuda recibida de otros, y en que medida algunos aspectos da la vida del cuidante eran afectados por la actividad de cuidar. El estudio fué descriptivo, comparativo y transversal. Fueron entrevistados 50 cuidantes de niños entre 3 y 10 años en un hospital infantil modelo en el tratamiento de dolencias onco-hematológicas, en Campinas, SP. Las actividades relacionadas al cuidar ocasionaron serios daños en la vida de los cuidantes. Por lo tanto, evaluar estos aspectos puede auxiliar al enfermero a identificar, amenizar y planear la asistencia a los cuidantes de niños con cáncer.This study aimed at demonstrating that the caregiving role affected the lives of caregivers of children with cancer, the child's degree of dependence regarding the performance of daily life activities (DLA, the degree of help offered by others and the degree to which some aspects of the caregiver's life were affected by caregiving

  18. Determination of stability constants of iron(III and chromium(III-nitrilotriacetate-methyl cysteine mixed complexes by electrophoretic technique

    Directory of Open Access Journals (Sweden)

    Brij Bhushan Tewari

    2004-06-01

    Full Text Available The stability constants of Fe(III and Cr(III with methyl cysteine and nitrilotriacetate (NTA were determined by paper electrophoretic technique. Beside binary ternary complexes have also been studied, in which nitrilotriacetate and methyl cysteine acts as primary and secondary ligand, respectively. The stability constants of mixed ligand complexes metal (M-nitrilotriacetate-methyl cysteine have been found to be 5.72 plus or minus 0.09 and 5.54 plus or minus 0.11 (log K values for Fe(III and Cr(III complexes, respectively, at 35 oC and ionic strength 0.1 M.

  19. Physico-chemical characterization of mixed-ligand complexes of Mn(III based on the acetylacetonate and maleic acid and its hydroxylamine derivative

    Directory of Open Access Journals (Sweden)

    Cakić Suzana M.

    2005-01-01

    Full Text Available Two new Mn(III mixed-ligand complexes with two acetylacetonate (acac ligands and one maleate ligand and its hydroxylamine derivative of the general formula [Mn(C5H7O22L] were prepared. Their structure was established by using elemental analysis, FTIR and UV/VIS spectroscopic methods, as well as magnetic measurement. Replacement of the acetylacetonate ligand by the corresponding acid ligand has been confirmed in Mn(III acetylacetonate. Based on the obtained experimental data and literature indications, structural formulae to these compounds were assigned.

  20. El consulado genovés de Sevilla (siglos XIII-XV. Aspectos jurisdiccionales, comerciales y fiscales

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    José Damián GONZÁLEZ ARCE

    2011-02-01

    Full Text Available El presente artículo analiza el funcionamiento del consulado genovés de Sevilla, entre los siglos XIII y XV, a partir de los privilegios concedidos por los reyes castellanos y otros documentos donde se contienen noticias sobre la actividad de estos italianos. En primer lugar, se estudian las competencias jurisdiccionales de dicho consulado y las facultades judiciales de sus cónsules. Luego son descritas las actividades mercantiles de la colonia ligur en el marco del consulado, así como otros aspectos ligados al comercio, como seguros y transportes. Y, finalmente, las exacciones fiscales a las que fueron sometidas esta colonia y las mercancías con las que traficó.