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Sample records for cardiopatia isquemica determinacion

  1. Left ventricle function in patients with ischemic cardiopathy: determination of the expulsion fraction of the left ventricle with gated-SPECT. Experience in the CMN 20 de Noviembre ISSSTE; Funcion ventricular izquierda en pacientes con cardiopatia isquemica: determinacion de la fraccion de expulsion del ventriculo izquierdo con gated-SPECT. Experiencia en el CMN 20 de Noviembre ISSSTE

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    Mendoza, L.; Puente, A.; Hernandez, T.; Jimenez, L. [Departamento de Medicina Nuclear y Cardiologia, Hospital CMN 20 de Noviembre, ISSSTE, 03000 Mexico D.F. (Mexico)

    2007-07-01

    The objective of this work is to correlate the expulsion fraction of the left ventricle (FEVI) obtained by means of g-SPECT and other diagnostic methods: ECO 2D and ventriculography for heart catheterization (CTT). (Author)

  2. Prevailing of ischemia cardiopathy, demonstrated by gammagraphy in less than 40 years old persons and its association with risk factors; Prevalencia de cardiopatia isquemica, demostrada por gammagrafia en menores de 40 anos y su asociacion con factores de riesgo

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    Cano G, M.A.; Castillo M, L.; Orea T, A. [Departamento de Medicina Nuclear, Departamento de Cardioiogia del Insitituto Nacional de Ciencias Medicas y Nutricion Salvador Zubiran. Mexico Distrito Federal (Mexico)

    2005-07-01

    The Coronary Arterial Illness (EAC) is the first cause of death of those Mexicans. Among their numerous risk factors it highlights the age with more bias starting from the 45 years. The objective of this investigation was to determine the prevailing of ischemic cardiopathy (Cl) and heart attack to the myocardium (IAM) in fellows smaller than 40 years and to identify risk factors. The study of myocardial perfusion (EPM) it is a non invasive study and of great sensibility and specificity that it allows to detect obstructive coronary lesions. The used method was retrospective-traverse Study in 125 patients smaller than 40 years. Files of patients to who EPM had been practiced with Technetium 99m-SESTAMlBI, protocol of one day, were revised, where its were analyzed the short and long axis (vertical and horizontal). General data, somatometry, emotional profile analysis, lipids and glucose profiles were gathered. Results. The population conformed it 53% women and 47% men with average of 31.9 year-old age of corporal mass index (IMC) 25.1 kg/cm{sup 2}. 46% of abnormal studies was obtained, of which 35% was compatible with ischemic cardiopathy (Cl) and 11% with heart attack to the myocardium (IAM). The characteristics of these were: age 31.6{+-}6 Vs 32.6{+-}5.9 years; IMC 25.4{+-}7.0 Vs 24.4{+-}3.34 kg/cm{sup 2}; stature 161.6{+-}9.8 Vs 165.5{+-}9.7cm; TAS 139.1{+-}29.2 Vs. 115{+-}13.4 mm Hg, TAD 84.5{+-}17.4 Vs. 75{+-}9.4 mm Hg; civil state married 65.5% (p=0.005) Vs single 57%; bigger depression 32% Vs anxiety 28%, in the group of patients with Cl and IAM, respectively. In the IAM population it was found an additional IRC 21% (p=0.030), HAS 21% (p=0.025) and drug addiction 21% (p=0.002). The rest of the results didn't show significant differences. Conclusion: Only 6.5% of the patients that went to EPM-{sup 99m}Tc-SESTAMIBl in a 6 year-old lapse, were smaller than 40 years. 71% of them was referred by prechordal pain in who almost the half it was evidenced Cl or IAM. In this investigation besides the well-known risk factors for EAC, the masculine kind; to suffer IRC, HAS; hypertriglyceridemia; the use of illicit drugs and the civil state favored the presence of EAC in young. (Author)

  3. Cambios en el perfil hemodinámico al instaurar la ventilación mecánica en pacientes con cardiopatia isquemica y enfermedad coronaria. Medición con bioreactancia torácica

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    Rodríguez, Ivon Johanna

    2012-01-01

    Introducción. La respiración puede afectar el rendimiento cardiaco, ciclo a ciclo a través de los efectos de la presión y del volumen intrapulmonar sobre las determinantes de la función cardiovascular. De esta manera, Las interacciones corazón-pulmón determinan el funcionamiento cardiovascular y la capacidad del corazón de adaptarse a nuevas condiciones de carga. Objetivo. Identificar los cambios en el perfil hemodinámico al instaurar la ventilación mecánica en pacientes con cardiopatía isqué...

  4. Mortalidade materna por cardiopatia Maternal mortality due to heart disease

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    Helvécio N. Feitosa

    1991-12-01

    Full Text Available Realizou-se estudo retrospectivo da mortalidade materna por cardiopatia, no período de janeiro de 1979 a dezembro de 1989. Dentre um total de 16.423 internações, houve 694 gestantes com o diagnóstico de cardiopatia (4,2%. No mesmo período, ocorreram 51 óbitos maternos, correspondendo a um coeficiente de mortalidade materna de 428,2/100.000 nascidos vivos. Houve 12 óbitos maternos por cardiopatia. A análise estatística permitiu a identificação de alguns fatores associados a maior risco de morte nas pacientes cardiopatas: primeira gravidez, primiparidade, ausência de assistência pré-natal, realização de cirurgia cardíaca anterior à gravidez e/ou na gestação. O maior número de mortes ocorreu no puerpério. A classificação funcional (NYHA não se constituiu em parâmetro seguro para avaliar o prognóstico materno, pois 91,7% dos casos de óbito foram incluídos no grupo considerado favorável (classes I e II ao iniciar a gestação.A retrospective study on maternal mortality in pregnant women with cardiac disease over a period of eleven years (January 1979 to December 1989 was undertaken. The objetive was an analysis of the main aspects of this association. Cardiac disease was diagnosed in 694 patients (4.2% of a total of 16,423 admitted to the Obstetrics Department of the Escola Paulista de Medicina. As for etiology, rheumatic disease (52.3%; Chagas's disease (19.3% and congenital disease (8.1% were the most frequent causes. There were 51 maternal deaths, according to FIGO's definition (1967, corresponding to a maternal mortality rate of 428.2/100,000 livebirths during the same period. Twelve of these maternal deaths were due to cardiac disease (maternal mortality rate of 100.8/100,000 livebirths. The statistical analysis identified the following aspects associated with maternal mortality among patients with cardiac disease: primigravida, lack of adequate prenatal care, and cardiac surgery performed previously to and

  5. Cardiopatias congênitas e malformações extracardíacas

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    Rosana Cardoso M. Rosa

    2013-06-01

    Full Text Available OBJETIVO: Revisar a associação entre cardiopatias congênitas e malformações extracardíacas. FONTES DE DADOS: A pesquisa incluiu artigos científicos presentes nos portais Medline, Lilacs e SciELO, utilizando-se os descritores "congenital heart disease", "congenital heart defects", "congenital cardiac malformations", "extracardiac defects" e "extracardiac malformations". Foram incluídos os artigos de séries de casos que exploravam especificamente a associação entre cardiopatias congênitas e malformações extracardíacas. SÍNTESE DOS DADOS: A cardiopatia congênita é responsável por cerca de 40% dos defeitos congênitos, sendo uma das malformações mais frequentes e a de maior morbimortalidade. Malformações extracardíacas são observadas em 7 a 50% dos pacientes com cardiopatia congênita, trazendo um risco ainda maior de comorbidade e mortalidade e tornando a cirurgia cardíaca mais arriscada. Diferentes estudos têm tentado avaliar a presença de anormalidades extracardíacas em pacientes portadores de cardiopatia congênita. Dentre as alterações descritas, destacam-se aquelas do trato urinário. Contudo, não houve um estudo que tenha avaliado do mesmo modo todos os pacientes. CONCLUSÕES: Anormalidades extracardíacas são frequentes em pacientes com cardiopatia congênita, sendo que os portadores de tais alterações podem apresentar um risco maior de morbimortalidade. Consequentemente, alguns autores vêm discutindo a importância e o custo-benefício da triagem destas crianças à procura de outras malformações por meio de exames complementares.

  6. Embolia cerebral na cardiopatia crônica chagásica

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    Abdo Badim

    1966-03-01

    Full Text Available Depois de breve análise sôbre a cardiopatia crônica chagásica e os fenômenos tromboembólicos dela decorrentes, o autor apresenta um exemplar da espécie com manifestações cerebrais, caracterizadas por afasia motora e hemiplegia sensitivo-motora, de predominância cefalobraquial. Foi o caso estudado sob os aspectos clínico, laboratorial e radiológico, os quais conduziram de modo inequívoco ao diagnóstico.

  7. Analysis of the relationship cost-effectiveness of the myocardial gammagraphy studies and the impact to the total expenditure by diagnostic of ischemic cardiopathy; Analisis de la relacion costo-efectividad de los estudios de gamagrafia miocardica e impacto al gasto total por diagnostico de cardiopatia isquemica

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    Valenzuela F, A.G.; Perez C, J.P. [Servicio de Cardiologia Nuclear, Hospital cardiologia CMN, IMSS, Mexico D.F. (Mexico); Arreola O, H. [Fundacion Mexicana para la Salud, Mexico D.F. (Mexico); Valenzuela F, A.A. [Unidad de Epidemiologia Hospitalaria, IMSS, Mexico D.F. (Mexico); Soto M, H. [UAEM, Toluca, Estado de Mexico (Mexico); Arguero S, R. [Director del Hospital de Cardiologia, IMSS, Mexico D.F. (Mexico)

    2005-07-01

    Recent advances in pharmacology, diagnostic and invasive procedures provide a series of modalities that diminish the morbidity and increase the long term survival in the patients that have suffered a heart attack to myocardium. The stratification by risk is an essential element for the handling of the survivors of heart attack to myocardium. In their attention it is looked for to optimize the therapeutic benefit, to diminish the unnecessary diagnostic and therapeutic procedures and to improve the efficiency. For example, a coronariography in sick with heart attack to myocardium it is not cost-effective if not is clinically suitable. Of there that from the institutional point of view, this is, of the Mexican Institute of the Public Health, they are required of appropriate reference approaches and counter reference to grant to the sick person, the best service that is the one in this case the diagnostic and the handling of the ischemic cardiopathy with the smallest waste of resources. The estimation of the annual survival is the base of the stratification, it constitutes the angular stone of the early handling of the heart attack to myocardium. The goal for the clinical would be to identify patients with intermediate risk, since, this risk makes them candidates to therapy interventionist. As long as those with low risk won't require intervention. This would allow the decrease of rates by revenues of heart attack to myocardium, and therefore to diminish the hospital staying rates. The Nuclear Cardiology (myocardial gammagraphy) it is not the only invasive method available to evaluate the myocardial perfusion in sick in who coronary illness is suspected. When the myocardial gammagraphy is carried out in appropriate population, the cost it diminishes because it restricts the necessity of additional invasive evaluations. This because the nuclear cardiology has predictive value so much for the mortality like to detect myocardial viability. Based on these probabilities, the doctor it could recommend diagnostic tests more sensitive and by this more cost-effective. The goal of this study was to design a model that compared cost-effectiveness of the gammagraphy in the diagnosis of the coronary illness by means of computed tomography by emission of simple protons (SPECT). (Author)

  8. Las determinaciones genéricas en los procesos adaptativos

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    Pérez Bowie, José Antonio

    2011-04-01

    Full Text Available The translation of a literary text to the screen is usually conditioned by many factors derivated from the new context in which the adapted title must work. Among these we can count the conditions imposed on the original text by the cinematographic genre serving as a model in the translation process. This paper examines the problem and analizes three spanish films of the postwar period in which the literary work experiments an important transformation to adapted to exigences of cinematographic model.

    El traslado de un texto literario a la pantalla suele estar condicionado por diversos factores derivados del nuevo contexto en el que el título adaptado debe funcionar. Entre ellos están los condicionamientos que ejerce sobre la obra originaria el género cinematográfico que sirve de modelo para el proceso adaptador. En el presente trabajo se reflexiona sobre esas determinaciones y se analizan tres ejemplos del cine español de postguerra en los cuales la obra literaria sufre una transformación considerable para adecuarse a las exigencias del modelo cinematográfico elegido.

  9. Cardiopatia fetal e estratégias de enfrentamento Fetal heart disease and coping strategies

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    Gláucia Rosana Guerra Benute

    2011-09-01

    Full Text Available OBJETIVOS: Avaliar as estratégias de enfrentamento (coping das gestantes frente ao diagnóstico de cardiopatia fetal. MÉTODOS: Foram entrevistadas 50 gestantes que receberam o diagnóstico de cardiopatia fetal. Para a coleta de dados utilizou-se uma entrevista semidirigida e o Inventário de Estratégia de Coping. A entrevista foi realizada, em média, 22 dias após terem recebido o diagnóstico. RESULTADOS: Ao investigar como se sentiam em relação ao bebê, 56,0% relataram preocupação e fragilidade, enquanto que as demais (44,0% afirmaram estarem felizes e bem. As estratégias mais utilizadas pelas gestantes foram: resolução de problemas (73,0%, suporte social (69,1%, fuga/esquiva (62,7%, e a estratégia menos utilizada foi a de afastamento (17,3%. Constatou-se que as mulheres com companheiro, utilizaram mais a estratégia de resolução de problemas (pPURPOSE: To evaluate the coping strategies of women facing a diagnosis of fetal heart disease. METHODS: We interviewed 50 women who had received a diagnosis of fetal heart disease. For data collection we used a semi-directed and Coping Strategy Inventory. The interview was conducted, on average, 22 days after the diagnosis. RESULTS: When asked how they felt about the baby, 56.0% reported concern and fragility, while the remaining 44.0% said they were happy and well. The strategies most used by women were problem solving (73.0%, social support (69.1% and escape/avoidance (62.7%, and the least used strategy was removal (17.3%. It was found that women with partners, as well as those with 1 or 2 children, used more the problem-solving strategy (p<0.05. CONCLUSIONS: The active coping strategies, focused on problem solving and seeking social support, coupled with the responsibility and the need for specific care for the survival and welfare of the baby, brought about a closer relationship with the pregnancy, strengthening the maternal-fetal bond.

  10. Strain bidimensional na cardiopatia de Takotsubo Two-dimensional strain in Takotsubo cardiomyopathy

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    Carlos Bellini G. Gomes

    2010-08-01

    Full Text Available Este relato apresenta o seguimento tardio de um caso de cardiomiopatia de Takotsubo com boa evolução clínica e melhora da função sistólica global ventricular esquerda. Contudo, observou-se persistência de significativa disfunção sistólica regional longitudinal que foi avaliada por meio de nova técnica ecocardiográfica (speckle tracking, com as medidas do strain (S e strain rate (SR correspondentes. Ressaltamos a importância desse novo método para o acompanhamento dessa cardiopatia, pois permite identificar os pacientes que persistem com disfunção sistólica e que possivelmente serão beneficiados com a manutenção da terapêutica clínica.This report presents the late follow-up of a case of Takotsubo cardiomyopathy with good clinical outcome and improved left ventricular global systolic function. However, there was persistence of significant regional longitudinal systolic dysfunction evaluated using a new echocardiographic technique (speckle tracking, with corresponding measures of strain (S and strain rate (SR. We emphasize the importance of this new method to monitoring this cardiomyopathy, since it identifies patients with persistent systolic dysfunction who will possibly benefit from maintenance of clinical therapy

  11. Incidência de acidente cerebro-vascular embólico na cardiopatia chagásica crônica

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    A. Spina-França

    1974-09-01

    Full Text Available A incidência de acidente vascular cerebral embólico na cardiopatia chagásica crônica foi avaliada a partir de duas séries consecutivas de casos: a primeira compreendendo 63 pacientes com cardiopatia chagásica crônica e, a segunda, 84 pacientes com acidentes cerebrovasculares, 59 dos quais de tipo não hemorrágico. Em relação aos casos de cardiopatia chagásica crônica a incidência de acidente vascular cerebral embólico mostrou-se da ordem de 3,17%; em relação aos acidentes cerebrovasculares, da ordem de 4,76% e quando considerados apenas aqueles de tipo não hemorrágico, da ordem de 6,78%.

  12. Prevalência de dislipidemia em população infantil com cardiopatia congênita

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    Gabriela Fuenmayor

    2013-09-01

    Full Text Available A dislipidemia é um dos grandes fatores de risco associados a doenças cardiovasculares. Poucos são os dados relacionados ao impacto da cardiopatia congênita na prevalência da dislipidemia na população pediátrica. O objetivo deste estudo foi avaliar o perfil lipídico de crianças portadoras de cardiopatia congênita seguidas em um centro de referência. Foram incluídos 52 pacientes pediátricos que tiveram perfil lipídico, metabólico e clínico determinados entre janeiro de 2011 e julho de 2012. Com média de idade de 10,4 ± 2,8 anos e predominância do sexo masculino (1,38:1, nossa população apresentou 53,8% de pacientes com aumento no colesterol total e 13,4% (IC 95% de 6,6-25,2% de crianças que também apresentavam LDL > 130 mg/dL, caracterizando dislipidemia. Dos pacientes com dislipidemia, só doisforam classificados como obesos. Concluímos que a presença de cardiopatia congênita não confere risco aumentado associado à presença de dislipidemia, devendo o rastreamento nessa população seguir as mesmas diretrizes da população pediátrica normal, as quaistambém independem do estado nutricional da criança.

  13. Cardiopatia congênita no adulto: perfil clínico ambulatorial no Hospital das Clínicas de Ribeirão Preto

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    Amaral,Fernando; Manso,Paulo Henrique; Granzotti,João Antonio; Vicente, Walter Villela de Andrade; Schmidt, Andre

    2010-01-01

    FUNDAMENTO: Experiências de serviços em adultos com cardiopatias congênitas não têm sido relatadas no nosso meio. OBJETIVO: Descrever o perfil clínico básico de adultos com cardiopatias congênitas atendidos ambulatorialmente em centro terciário. MÉTODOS: Anotaram-se dados referentes a idade, sexo, procedência, diagnóstico principal e diagnósticos secundários de 413 pacientes atendidos durante sete anos. RESULTADOS: G1 (não tratados): 195 pacientes, 51% mulheres, 57% entre 14 e 30 anos, 80% re...

  14. Evolução da cardiopatia experimentalmente induzida em coelhos infectados com Trypanosoma cruzi

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    Florêncio Figueiredo

    1985-09-01

    Full Text Available Coelhos jovens de ambos os sexos (1-2 meses de idade, outbred, inoculados com tripomastigotas da cepa Colômbia de Trypanosoma cruzi desenvolveram lesões cardíacas, macro e microscópicas, além de características parasitológicas e imunológicas, muito semelhantes às observadas na doença de Chagas humana, tanto na fase aguda como na fase crônica. Na fase aguda a síndrome cardíaca caracteriza-se macroscopicamente por discreta cardiomegalia, com dilatação de câmaras direitas, e miscroscopicamente por miocardite focal pouco acentuada; na fase crônica, por cardiomegalia moderada ou acentuada, com hipertrofia e dilatação de câmaras e adelgaçamento da ponta (aneurisma apical, predominantemente do ventrículo esquerdo, e por miocardite focal, cóm áreas de necrose miocitolítica e degeneração de miocélulas, associadas a infiltrado inflamatório, principalmente composto de linfócitos, e fibrose intersticial. Devido à reprodução de aspectos da doença cardíaca chagásica humana em tempo relativamente curto, à simplicidade, à disponibilidade para múltiplos pesquisadores e ao baixo custo, o modelo representado pelo coelho constitui uma alternativa para estudos dos mecanismos, patologia e tratamento da cardiopatia chagásica.

  15. Evolução dos conhecimentos sôbre a cardiopatia da doenca de Chagas: revisão crítica da literatura

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    Francisco S. Laranja

    1949-12-01

    Full Text Available Foi feita uma revisão critica da literatura sobre cardiopatia da Doença de Chagas, discutindo-se os principais aspectos clínicos desta cardiopatia á luz da experiência por nós adquirida nestes últimos anos. A evolução dos conhecimentos clínicos sobre esquisotripanose pode ser sintetisada em três fases: a A primeira corresponde á descoberta da doença, feita por Chagas, e á descrição por ele e seus primeiros colaboradores das manifestações clínicas essenciais da nova entidade mórbida, na qual distinguiu a forma aguda e várias formas crônicas. b Na segunda fase, a pesquisa orientou-se essencialmente pela busca dos casos de infecção aguda, havendo considerável duvida a respeito da realidade clinica das formas crônicas da infecção. Durante um longo período raros casos de cardiopatia crônica foram publicados. Ate o momento acual (1948 encontram-se na literatura estrangeira 134 casos de cardiopatia crônica chagásica, dos quais 9 autopsiados; ate fins de 1944, o numero de casos publicados no Brasil, fora de Lassance, era de 45, dos quais 3 autopsiados. c A terceira fase ou fase atual, tende a caracterisar-se por um interesse particular nos casos de infecção crônica, orientando-se porém a pesquisa cli¬nica essencialmente pelas manifestações da cardiopatia. Contribuições recentes de ordem clínica e experimental trouxeram ampla confirmação as idéias de Chagas a respeito desta cardiopatia e colocaram-na em posição de entidade clinica de realidade indiscutível. Sua importância social esta sendo determinada e os dados disponíveis já lhe apontam relevante significação em certas regiões. Mais de 600 casos de cardiopatia crônica chagásica foram publicados no Brasil nestes últimos quatro anos.

  16. Anormalidades cromossômicas entre pacientes com cardiopatia congênita

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    Patrícia Trevisan

    2013-12-01

    Full Text Available FUNDAMENTO: As anormalidades cromossômicas (ACs representam importante causa de cardiopatia congênita (CC. OBJETIVO: Determinar a frequência, os tipos e as características clínicas de ACs identificadas em uma amostra prospectiva e consecutiva de pacientes com CC. MÉTODO: Nossa amostra foi composta por pacientes com CC avaliados em sua primeira hospitalização em uma unidade cardíaca de tratamento intensivo de um hospital pediátrico de referência do sul do Brasil. Todos os pacientes foram submetidos à avaliação clínica e citogenética, através do cariótipo de alta resolução. Os defeitos cardíacos foram classificados segundo Botto e cols. Na análise estatística utilizou-se o qui-quadrado, o teste exato de Fisher e odds ratio (p < 0,05. RESULTADOS: Nossa amostra foi composta de 298 pacientes, 53,4% do sexo masculino, com idades variando de um dia a 14 anos. Anormalidades cromossômicas foram observadas em 50 pacientes (16,8%, sendo que 49 deles eram sindrômicos. Quanto às ACs, 44 delas (88% eram numéricas (40 pacientes com +21, dois com +18, um com triplo X e um com 45,X e seis (12% estruturais [dois pacientes com der(14;21, +21, um com i(21q, um com dup(17p, um com del(6p e um com add(18p]. O grupo de CCs mais associado a ACs foi o do defeito de septo atrioventricular. CONCLUSÕES: ACs detectadas pelo cariótipo são frequentes entre pacientes com CC. Assim, os profissionais - especialmente aqueles que trabalham em serviços de cardiologia pediátrica - devem estar cientes das implicações que a realização do cariótipo pode trazer, tanto para o diagnóstico, tratamento e prognóstico desses pacientes como para o seu aconselhamento genético.

  17. Evolução da cardiopatia experimentalmente induzida em coelhos infectados com Trypanosoma cruzi

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    Florêncio Figueiredo

    1985-09-01

    Full Text Available Coelhos jovens de ambos os sexos (1-2 meses de idade, outbred, inoculados com tripomastigotas da cepa Colômbia de Trypanosoma cruzi desenvolveram lesões cardíacas, macro e microscópicas, além de características parasitológicas e imunológicas, muito semelhantes às observadas na doença de Chagas humana, tanto na fase aguda como na fase crônica. Na fase aguda a síndrome cardíaca caracteriza-se macroscopicamente por discreta cardiomegalia, com dilatação de câmaras direitas, e miscroscopicamente por miocardite focal pouco acentuada; na fase crônica, por cardiomegalia moderada ou acentuada, com hipertrofia e dilatação de câmaras e adelgaçamento da ponta (aneurisma apical, predominantemente do ventrículo esquerdo, e por miocardite focal, cóm áreas de necrose miocitolítica e degeneração de miocélulas, associadas a infiltrado inflamatório, principalmente composto de linfócitos, e fibrose intersticial. Devido à reprodução de aspectos da doença cardíaca chagásica humana em tempo relativamente curto, à simplicidade, à disponibilidade para múltiplos pesquisadores e ao baixo custo, o modelo representado pelo coelho constitui uma alternativa para estudos dos mecanismos, patologia e tratamento da cardiopatia chagásica.Male and female out bred young rabbits (1-2 months of age inoculated with trypomastigote forms of the Colombia strain of T. cruzi have been shown to develop cardiac pathologic changes, besides parasitologícal and immunological features, very similar to those observed in both acute and chronic phases of Chagas' disease in man. In the acute phase the cardiac syndrome is characterized grossly by slight cardiomegaly, with dilatation of the right chambers and microscopically by discretefocal myocarditis: in the chronic phase, by moderate ormarked cardiomegaly, with hypertrophy and dilatation of all chambers, and thinning of the ventricularapex (apical aneurysm, particularly of the left ventricle, andstriking

  18. Mapeamento epicárdico da taquicardia ventricular sustentada em cardiopatias não isquêmicas

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    Geórgia Guedes da Silva

    2011-02-01

    Full Text Available FUNDAMENTO: A complexidade dos circuitos reentrantes relacionados às taquicardias ventriculares diminui os índices de sucesso dos procedimentos de ablação por radiofrequência. OBJETIVO: Avaliar se o mapeamento epicárdico com múltiplos eletrodos realizado simultaneamente com o mapeamento endocárdico auxilia na ablação da taquicardia ventricular (TV sustentada em pacientes com cardiopatia não isquêmica. MÉTODOS: Vinte e seis pacientes com TV sustentada recorrente, sendo 22 (84,6% com cardiopatia chagásica crônica, dois (7,7% com cardiomiopatia dilatada idiopática e dois (7,7% portadores de displasia arritmogênica do ventrículo direito, foram submetidos a mapeamento epicárdico com dois ou três microcateteres, com 8 eletrodos cada, simultaneamente ao mapeamento endocárdico convencional. Utilizou-se cateter com ponta de 4 mm para ablação com radiofrequência (RF realizada durante a TV induzida. RESULTADOS: Das 33 TVs induzidas, 25 foram mapeadas e 20 tiveram sua origem definida. Onze com origem epicárdica e 9 endocárdica. A estimulação ventricular programada não induziu TV sustentada em 11 (42,0% dos 26 pacientes após a ablação. Eventos como recorrência da TV e morte ocorreram em 10,0% dos pacientes submetidos à ablação com sucesso, e em 59,0% dos insucessos, em seguimento ambulatorial médio de 357 ± 208 dias. CONCLUSÃO: Circuitos subepicárdicos são frequentes em pacientes com cardiopatia não isquêmica. O mapeamento epicárdico com múltiplos cateteres realizado simultaneamente com o mapeamento endocárdico contribui para a identificação destes circuitos em um mesmo procedimento.

  19. Síndrome de deleção 22q11.2 e cardiopatias congênitas

    OpenAIRE

    Rafael Fabiano M. Rosa; Zen, Paulo Ricardo G.; Graziadio, Carla; Paskulin,Giorgio Adriano

    2011-01-01

    OBJETIVO: Revisar as características clínicas, etiológicas e diagnósticas da síndrome de deleção 22q11 e sua associação com as cardiopatias congênitas. FONTES DOS DADOS: Foram pesquisados artigos científicos presentes nos portais Medline, Lilacs e SciELO, utilizando-se descritores específicos como "22q11", "DiGeorge syndrome", "velocardiofacial syndrome", "congenital heart defects" e "cardio-vascular malformations". O período adotado para a revisão foi de 1980 a 2009. SÍNTESE DOS DADOS: As ma...

  20. Terapia gênica para cardiopatia isquêmica: revisão de ensaios clínicos

    OpenAIRE

    Eibel, Bruna; Rodrigues, Clarissa G.; Giusti, Imarilde I.; Ivo A Nesralla; Prates,Paulo R . L.; Roberto T. Sant'Anna; Nance B. Nardi; Kalil, Renato A. K.

    2011-01-01

    Cardiopatia isquêmica grave com angina refratária a formas convencionais de tratamento apresenta-se em uma crescente incidência. Para tratar angina refratária, terapias alternativas na tentativa de redução da isquemia miocárdica e alívio de sintomas têm sido estudadas. Neste contexto, a terapia gênica representa uma opção, pela possibilidade de induzir angiogênese, estabelecer circulação colateral e reperfundir miocárdio isquêmico. Diversos ensaios clínicos têm sido conduzidos e, com exceção ...

  1. Incidência da cardiopatia chagásica em 15.000 necrópsias consecutivas e sua associação com os «megas»

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    A. J. A. Barbosa

    1970-08-01

    Full Text Available Os AA. estudaram, a incidência da cardiopatia chagásica em 15.000 necrópsias consecutivas e sua associação com os megas. Em 875 cardiopatias chagásicas houve 145 casos de megas, ou seja, 16,56%, com predominância do sexo masculino. No branco houve maior incidência (55 de megas do que no mulato (53 e no negro (31 dentre 858 cardiopatias chagásicas. Em 848 cardiopatias chagásicas, 85,78% eram de indivíduos que faleceram entre 21 e 60 anos. O maior número de cardiopatias (120 ou 14,14% e de "megas'' (21 ou 15,78% foi encontrado nos indivíduos entre 36 a 40 anos. Os nossos resultados mostram uma incidência diferente da associação cardiopatia-mega, em comparação da observada em outras regiões do País e em outros países da América do Sul.

  2. Alterações neurológicas nas cardiopatias congênitas um estudo neuropatológico

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    S. Rosemberg

    1992-03-01

    Full Text Available Estudo neuropatológico foi realizado em 190 autópsias consecutivas de pacientes com cardiopatias congênitas: 116 casos foram operados (grupo cirúrgico, GCg e os 74 restantes formam o grupo clínico (GCI. Alterações neuropatológicas foram observadas em 71 casos (41 no GCg e 30 no GCI. Entretanto, a maior parte dos 129 casos com exame normal morreu nas primeiras 72 horas após a cirurgia ou os eventos clínicos responsáveis pela morte. Quase todas as alterações foram hipóxico-isquêmicas. Infartos, únicos ou múltiplos, foram encontrados em 41 casos (23 no GCg e 18 no GCI. Mecanismo embólico foi detectado em 12 casos. Alterações hipóxicas difusas estavam presentes em 17 casos (10 no GCg e 7 no GCI. Hemorragias foram encontradas em 11 (6 no GCg e 5 no GCI. Em 17 casos (5 no GCI e 12 no GCg, o quadro foi o de uma leucomalacia periventricular. Todos os casos eram concernentes a crianças abaixo de 6 meses de idade. Em 7 casos, alterações inflamatórias foram detectadas (micro-abscessos difusos em 6 e abscesso de lobo frontal em 1. Quase todos os casos em ambos os grupos apresentaram complicações clínicas, isoladas ou associadas, potencialmente danosas para o cérebro, como parada cardíaca, baixo débito cardíaco, hipoxemia e insuficiência respiratória. Foi impossível determinar, em cada caso, a magnitude do fator ou fatores responsáveis pelo padrão neuropatológico correspondente. Não houve diferenças do padrão neuropatológico entre as cardiopatias com hiper ou hipofluxo pulmonar.

  3. O conduto valvulado bovino contegra, um biomaterial para o tratamento cirúrgico de cardiopatias congênitas

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    Shi-Min Yuan

    Full Text Available O Contegra, um enxerto de veia jugular bovina, tem sido amplamente utilizado como biomaterial de preferência no tratamento cirúrgico das cardiopatias congênitas, especialmente como um conduto para a reconstrução da via de saída ventricular direita. Este artigo tem como objetivo fazer uma revisão abrangente sobre os desfechos clínicos do Contegra. Foram recuperados, coletados e analisados, relatos de Contegra publicados desde 2002. Havia 1.718 Contegra, aplicados em 1.705 pacientes. Os tamanhos dos condutos foram de 8-22 mm. As idades dos pacientes foram de recém-nascidos até 74,5 anos, com prevalência de pacientes pediátricos. O diagnóstico primário foi cardiopatia congênita em todos os casos, sendo os três diagnósticos principais: tetralogia de Fallot, tronco arterioso e atresia pulmonar, que representaram 25,6%, 16,7% e 13,1%, respectivamente. O Contegra foi utilizado como enxerto tubular na posição pulmonar em 1635 (95,9% pacientes, como remendo monocúspide em 12 (0,7%, como enxerto na posição da valva pulmonar ou monocúspide em 40 (2,3%, e, como conduto artéria pulmonar-veia cava inferior na operação de Fontan, em 18 (1,1% pacientes, respectivamente. O reimplante de conduto foi realizado em 141 (8,3% pacientes, 33,8 ± 37 (8,6-106,8 meses após a inserção do conduto inicial. A plástica do conduto foi necessária em seis (0,4% e a reintervenção em 83 (4,9% dos pacientes. As indicações do reimplante do conduto incluíram estenose importante da anastomose distal, pseudoaneurisma da anastomose proximal e regurgitação importante do conduto. Quanto ao bom desempenho, disponibilidade e longevidade, o Contegra é um biomaterial adequado para a reconstrução da via de saída ventricular direita e como remendo para reparo de comunicação interventricular, mas não é apto para a operação de Fontan.

  4. Acidentes vasculares cerebrais embólicos na cardiopatia chagásica crônica

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    Israel Nussenzveig

    1953-12-01

    Full Text Available Os autores apresentam oito casos de cardiopatia crônica chagásica, comprovada pela reação de Machado-Guerrero, em cuja evolução ocorreram acidentes vasculares cerebrais. Discutem a etiología dêsses acidentes, afastando os fatôres etiológicos conhecidos e formulando a hipótese de embolia cerebral a partir de trombose mural cardíaca. Quatro casos foram fatais, tendo sido necropsiados. Em dois dêles os achados anátomo-patológicos vieram comprovar a hipótese, enquanto, dos dois restantes, em um havia concomitantemente artériosclérose cerebral difusa e no outro verificou-se amolecimento cerebral, na ausência de qualquer dos fatôres etiológicos conhecidos, mas não havia trombose nas cavidades esquerdas do coração; é lembrada a possibilidade de trombo mural fracamente aderido ao endocárdio, que se tivesse desprendido in totum. Embora não tivessem conseguido a comprovação de sua hipótese, os autores são de opinião que êste foi o mecanismo patogênico nos 8 casos apresentados e chamam a atenção para a doença de Chagas como fator etiológico da embolia cerebral.

  5. Cotidiano da gravidez de risco por cardiopatia: estudo fenomenológico das relações assistenciais

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    Thaís Vasconselos Amorim

    Full Text Available RESUMO Objetivo: Desvelar o cotidiano das relações assistenciais do ser-aí-mulher na gravidez de alto risco por doença cardíaca. Métodos: Pesquisa qualitativa fenomenológica. Dezessete participantes foram entrevistadas em instituição referência para risco materno e os significados expressos foram analisados à luz do pensamento de Martin Heidegger. Resultados: As mulheres significaram terem sido cobradas pelos médicos por engravidarem e; saberem que o cardiologista dá o parecer, mas o obstetra é quem vai decidir a via de parto. Conclusão: Evidenciaram-se relações assistenciais pautadas na ótica fisiopatológica de acompanhamento gestacional e invisibilidade da equipe de enfermagem junto à gestante. Se por um lado os resultados apontam a necessidade de transcender para uma relação existencial que considera a mulher como ser-aí dotada de possibilidades, por outro anuncia a importância do cuidado de enfermagem congruente às necessidades de gestantes portadoras de cardiopatia na perspectiva de se fazer percebido e anunciado pelo ser-cuidado.

  6. Perfil de adolescentes e adultos portadores de cardiopatia congênita atendidos em ambulatório da especialidade no Conjunto Hospitalar de Sorocaba

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    Jéssica Vasques Rodrigues Almenara

    2014-10-01

    Full Text Available Introdução: Adolescentes e adultos portadores de cardiopatias congênitas têm hoje expectativa de vida crescente em todo o mundo, graças aos avanços da medicina no que diz respeito a novas técnicas cirúrgicas ou métodos para diagnóstico precoce; Objetivos: Caracterizar o perfil de adolescentes e adultos portadores de cardiopatias congênitas atendidos no ambulatório de Cardiologia Pediátrica do CHS, por período de 10 meses, e estimular criação de ambulatório para seu atendimento especializado; Metodologia: Preenchimento, pelo pesquisador, de uma Ficha Clínica elaborada de acordo com itens considerados essenciais para descrição do perfil dos pacientes, durante entrevistas realizadas nos atendimentos, mediante assinatura do Termo de Consentimento pelo sujeito de pesquisa, e posteriormente, através de consulta aos prontuários. Resultados: Através de estatística descritiva, foram caracterizados perfis de 76 pacientes, com idades de 12 a 57 anos, média de 17 e mediana de 15. As cardiopatias mais frequentes foram comunicação interventricular (22,4% e estenose aórtica (17,1%. Concomitantemente, 76,3% dos entrevistados não apresentavam sintomas. Os pacientes foram agrupados de acordo com a classificação funcional N.Y.H.A, tendo predominado os da classe I (80,3%, e também categorizados quanto ao quadro evolutivo. Conclusões: A criação ambulatórios especializados para atender essa população pode proporcionar melhor prognóstico e tratamento, controle dos sintomas e melhora na qualidade de vida.

  7. Malformações detectadas pelo ultrassom abdominal em crianças com cardiopatia congênita

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    Rosana Cardoso Manique Rosa

    Full Text Available FUNDAMENTO: Malformações extracardíacas podem estar presentes em pacientes com cardiopatia congênita (CC, trazendo maior risco de comorbidade e mortalidade. OBJETIVO: Verificar a frequência e os tipos de anormalidades abdominais detectadas em crianças com e sem CC através do ultrassom abdominal (USA, comparar os pacientes quanto a seus achados dismórficos/citogenéticos e realizar uma estimativa do custo-benefício da triagem pelo USA. MÉTODOS: Foi realizado um estudo transversal com controle. Os casos consistiram de pacientes com CC admitidos pela primeira vez em uma unidade de terapia intensiva pediátrica; os controles consistiram de crianças sem CC submetidas ao USA no hospital logo após cada caso. Todos os pacientes com CC foram submetidos ao USA, ao cariótipo de alta resolução e à hibridização in situ fluorescente (FISH para microdeleção 22q11.2. RESULTADOS: USA identificou anormalidades clinicamente significativas em 12,2% dos casos e em 5,2% dos controles (p = 0,009, com um poder de significância de 76,6%. A maioria das malformações com significado clínico foi de anomalias renais (10,4% nos casos e 4,9% nos controles, p = 0,034. No Brasil, o custo de um exame de USA pelo Sistema Único de Saúde é de 21 dólares. Uma vez que anormalidades clinicamente significativas foram observadas em um a cada 8,2 pacientes com CC, o custo para identificar uma criança afetada foi de 176 dólares. CONCLUSÃO: Pacientes com CC apresentam uma frequência significativa de anomalias detectadas pelo USA, um método diagnóstico barato e não invasivo, com boa sensibilidade. O custo da triagem para esses defeitos é consideravelmente menor que o custo para tratar as complicações do diagnóstico tardio de malformações abdominais, como a doença renal.

  8. Morbilidade psiquiátrica e psicopatológica nos adolescentes e jovens adultos com cardiopatias congénitas

    OpenAIRE

    Vieira, Daniela Castro

    2010-01-01

    A doença cardíaca congénita encontra-se frequentemente na população mundial de recém-nascidos e, portanto, é necessário abordar esta temática com a devida atenção e preocupação. Sabendo que esta malformação está presente desde o nascimento, torna-se fundamental sensibilizar todos os técnicos de saúde inseridos nas mais diversas equipas médicas, para que esta patologia não seja apenas detectada anos mais tarde. Parece ser consensual que os doentes com cardiopatias congénitas apresentam níve...

  9. Operação de Blalock-Taussig modificada para o tratamento paliativo de cardiopatias congênitas com hipofluxo pulmonar

    OpenAIRE

    Miguel A Maluf; Andrade, José Carlos S.; Carvalho,Antônio; Catani,Roberto; Vega,Hermínio; José L. Andrade; Silva, Célia; Werther B. de Carvalho; Buffolo,Ênio

    1995-01-01

    De janeiro de 1990 a novembro de 1994, 72 pacientes portadores de cardiopatias congênitas com hipofluxo pulmonar foram submetidos à operação de Blalock-Taussig. A idade variou entre 2 dias e 11 anos (M:9,0 meses); 44 (61,1%) eram do sexo masculino e 28 (38,8%) do feminino; 38 (52,8%) casos portadores de tétrade de Fallot; 7 (9,7%) atresia pulmonar com septo interventricular íntegro (AP c/ SIVI); 6 (8,4%) transposição das grandes artérias (TGA) + estenose pulmonar (EP); 6 (8,4%) atresia tricús...

  10. Comparação do desfecho entre a cardiopatia chagásica e a miocardiopatia dilatada idiopática

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    Amanda Pires Barbosa

    2011-12-01

    Full Text Available FUNDAMENTO: Pouco se sabe sobre o desfecho dos pacientes com cardiopatia chagásica, em comparação aos pacientes com miocardiopatia dilatada idiopática na era contemporânea. OBJETIVO: Comparar o desfecho dos pacientes chagásicos com insuficiência cardíaca sistólica crônica decorrente da cardiopatia chagásica ao observado em pacientes com MDI na era contemporânea. MÉTODOS: Foi incluído um total de 352 pacientes (246 com cardiomiopatia chagásica e 106 com miocardiopatia dilatada idiopática, seguidos prospectivamente em nossa Instituição, de janeiro de 2000 a janeiro de 2008. Todos os pacientes receberam tratamento clínico contemporâneo padrão. RESULTADOS: Na análise multivariada com o modelo de risco proporcional de Cox, o uso da digoxina (relação de risco = 3,17; intervalo de confiança de 95%, de 1,62 a 6,18; p = 0,001 necessitou de suporte inotrópico (relação de risco = 2,08; intervalo de confiança de 95%, de 1,43 a 3,02; p < 0,005. A fração de ejeção do ventrículo esquerdo (relação de risco = 0,97; intervalo de confiança de 95%, de 0,95 a 0,99; p < 0,005 e a etiologia da cardiopatia chagásica (relação de risco = 3,29; intervalo de confiança de 95%, de 1,89 a 5,73; p < 0,005 foram associadas positivamente à mortalidade, enquanto a terapia com betabloqueadores (relação de risco = 0,39; intervalo de confiança de 95%, de 0,26 a 0,56; p < 0,005 foi associada negativamente à mortalidade. A probabilidade de sobrevida para pacientes com cardiomiopatia chagásica em oito, 24 e 49 meses foi de 83%, 61% e 41%, respectivamente. Já para pacientes com cardiomiopatia dilatada idiopática, foi de 97%, 92% e 82%, respectivamente (p < 0,005. CONCLUSÃO: Na era atual do tratamento da insuficiência cardíaca, os pacientes com cardiomiopatia chagásica têm um desfecho pior em comparação aos pacientes com cardiomiopatia dilatada idiopática.

  11. eNOS se correlaciona com a biogênese mitocondrial em corações com cardiopatia congênita e cianose

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    Juan Xiao

    2012-09-01

    Full Text Available FUNDAMENTO: O programa de biogênese mitocondrial no coração parece apresentar remodelação adaptativa após estresse biomecânico e oxidativo. Os mecanismos adaptativos que protegem o metabolismo do miocárdio durante a hipóxia são coordenados, em parte, pelo óxido nítrico (NO. OBJETIVO: Observar a biogênese mitocondrial e expressão do óxido nítrico sintase (NOS em corações de cardiopatia congênita com cianose; discutir a resposta mitocondrial à hipóxia crônica do miocárdio. MÉTODOS: Foram investigados 20 pacientes com defeitos cardíacos cianóticos (n = 10 ou acianóticos (n = 10. Foram estudadas amostras do miocárdio na via de saída ventricular direita, tomadas durante a operação. A análise morfométrica de mitocôndrias foi realizada por microscopia eletrônica de transmissão. A relação mtDNA/nDNA foi determinada com PCR em tempo real. Os níveis de transcrição da subunidade I da citocromo c oxidase (COXI, coativador-1α do receptor γ ativado por proliferador de peroxissoma (PGC-1α, o fator respiratório nuclear 1 (NRF1, e fator de transcrição mitocondrial A (Tfam foram detectados por reação em cadeia da polimerase via transcriptase reversa (RT-PCR ativado por fluorescência em tempo real. Os níveis proteicos de COXI e nNOS, iNOS e eNOS foram medidos por técnica de Western Blot. RESULTADOS: A densidade volumétrica mitocondrial (Vv e a densidade numérica (Nv foram significativamente elevadas em pacientes com cianose, em comparação com a cardiopatia congênita acianótica. MtDNA elevada e suprarregulação dos níveis de COXI, PGC-1 α, NRF1 e Tfam mRNA foram observadas em pacientes cianóticos. Os níveis de proteína de COXI e eNOS foram significativamente maiores no miocárdio de pacientes cianóticos que nos de acianóticos. Os níveis de transcrição do PGC-1α se correlacionam com os níveis de eNOS. CONCLUSÃO: A biogênese mitocondrial é ativada no miocárdio da via de saída ventricular na

  12. Evolução da cardiopatia chagásica crônica I - influência da parasitemia

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    José Borges Pereira

    1992-06-01

    Full Text Available No período de 8 anos (1982-1990 foi avaliada a evolução da cardiopatia chagásica crônica (CCC,pelo estudo eletrocardiográfico de repouso, edaparasitemiapeloxenodiagnóstico em 279pacientes, 85 homens e 194mulheres, com idades de 7a 76 anos (média = 42,6 anos, todos do municípios de Virgem da Lapa, Estado de Minas Gerais, Brasil. De acordo com os resultados dos eletrocardiogramas classificamos a evolução da CCC em inalterada (El - quando não havia mudança no padrão inicial do traçado, progressiva (EP - quando havia mudança de normal para alterado ou pelo agravamento das alterações € regressiva (ER - quando havia normalização ou redução da gravidade das alterações. De acordo com os resultados dosxenodiagnósticos (mínimo de 3 e máximo de 8 por paciente, 120 pacientes foram considerados com parasitemia positiva - um ou mais exames positivos e 159 com parasitemia negativa - todos os exames negativos. Os resultados mostraram: a EI em 172 (61,6% pacientes, EP em 99 (35,5% e ER em 8 (2,9%, sem diferença significativa entre o tipo de evolução e o tipo de parasitemia; ba EP foi crescente com a idade tanto no grupo com parasitemia positiva como no grupo com parasitemia negativa e significativamente maior nos homens emrelação ásmulheres, independentemente do tipode parasitemia. Com estes achados podemos afirmar que o aparecimento ou a progressão da CCC não se mostraram associadas ao tipo de parasitemia, mas sim ao sexo masculino e ao aumento da idade dos pacientes, sugerindo que a parasitemia não está relacionada com o agravamento da cardiopatia chagásica crônica.

  13. Avaliação do tratamento cirúrgico da cardiopatia congênita em pacientes com idade superior a 16 anos

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    Luiz Fernando Caneo

    2012-05-01

    Full Text Available FUNDAMENTO: O número crescente de crianças com cardiopatias congênitas em evolução demanda maior preparo dos profissionais e das instituições que as manuseiam. OBJETIVO: Descrever o perfil dos pacientes com idade superior a 16 anos com cardiopatia congênita operados e analisar os fatores de risco preditivos de mortalidade hospitalar. MÉTODOS: Mil, quinhentos e vinte pacientes (idade média 27 ± 13 anos foram operados entre janeiro de 1986 e dezembro de 2010. Foram realizadas análise descritiva do perfil epidemiológico da população estudada e análise dos fatores de risco para mortalidade hospitalar, considerando escore de complexidade, ano em que a cirurgia foi realizada, procedimento realizado pelo cirurgião pediátrico ou não e presença de reoperação. RESULTADOS: Ocorreu um crescimento expressivo no número de casos a partir do ano 2000. A média do escore de complexidade foi 5,4 e os defeitos septais corresponderam a 45% dos casos. A mortalidade geral foi 7,7% e o maior número de procedimentos (973 ou 61,9% com maior complexidade foi realizado por cirurgiões pediátricos. Complexidade (OR 1,5, reoperação (OR 2,17 e cirurgião pediátrico (OR 0,28 foram fatores de risco independentes que influenciaram a mortalidade. A análise multivariada mostrou que o ano em que a cirurgia foi realizada (OR 1,03, a complexidade (OR 1,44 e o cirurgião pediátrico (OR 0,28 influenciaram no resultado. CONCLUSÃO: Observa-se um número crescente de pacientes com idade superior a 16 anos e que, apesar do grande número de casos simples, os mais complexos foram encaminhados para os cirurgiões pediátricos, que apresentaram menor mortalidade, em especial nos anos mais recentes. (Arq Bras Cardiol. 2012; [online].ahead print, PP.0-0

  14. Avaliação de fatores de risco para cardiopatia isquêmica e valor prognóstico de critérios diagnósticos de cardiopatia isquêmica em pacientes com Diabetes Mellito tipo 2

    OpenAIRE

    André Fernando Pinto Rodrigues Neto

    2000-01-01

    O diabete melito (DM) está associado a um aumento de 2 a 3 vezes na prevalência de doença cardiovascular, sendo a cardiopatia isquêmica (CI) a principal causa de morte em pacientes com DM tipo 2 (DM2). Em pacientes com DM2, a avaliação dos fatores de risco e a análise completa dos métodos diagnósticos capazes de alterar o prognóstico cardiovascular não estão estabelecidos de forma definitiva. O objetivo deste estudo foi avaliar os fatores de risco relacionados ao desenvolvimento de eventos ca...

  15. Parâmetros Ecocardiográficos e Sobrevida na Cardiopatia Chagásica com Disfunção Sistólica Importante

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    Daniela do Carmo Rassi

    2014-04-01

    Full Text Available Fundamento: O ecocardiograma fornece dados importantes na avaliação cardiológica de pacientes em insuficiência cardíaca. A identificação de parâmetros ecocardiográficos na cardiopatia chagásica grave auxiliaria na implementação terapêutica e na avaliação prognóstica. Objetivo: Correlacionar parâmetros ecocardiográficos com desfecho mortalidade cardiovascular em pacientes com fração de ejeção 70,71 mL/m2 foi associado ao aumento significativo na mortalidade (log rank p < 0,0001. Conclusão: O volume indexado do átrio esquerdo mostrou-se como único fator de predição independente de mortalidade nesta população de pacientes chagásicos e com disfunção sistólica importante.

  16. Potenciação pós-extra-sistólica na cardiopatia chagásica crônica: estudo com ventriculografia de contraste radiológico

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    Brandão José Mário M.

    2005-01-01

    Full Text Available OBJETIVO: Determinar a existência e freqüência do fenômeno da potenciação pós-extra-sistólica em áreas miocárdicas discinérgicas de pacientes com cardiopatia chagásica crônica estudados por ventriculografia de contraste radiológico. MÉTODOS: Análise retrospectiva semiquantitativa da ventriculografia de contraste radiológico em pacientes com cardiopatia chagásica crônica, consecutivamente estudados para avaliação de mecanismos de taquicardia ventricular. RESULTADOS: De 72 pacientes inicialmente incluídos, apenas em 20 o ventriculograma foi analisável para os propósitos do estudo. O fenômeno da potenciação pós-extra-sistólica foi verificado em 11 (55% desses pacientes, obtendo-se melhora de 15,31% no escore de contração, da situação basal para a de pós-extra-sístole (p= 0,0001. Sua ocorrência verificou-se mesmo em segmentos ventriculares com déficit intenso de contratilidade. CONCLUSÃO: O fenômeno da potenciação pós-extra-sistólica é verificável em proporção significante de pacientes com cardiopatia chagásica crônica em que, angiograficamente, foi possível analisar o fenômeno, indicando a existência de reserva contrátil, potencialmente recrutável, em regiões ventriculares, exibindo discinergia acentuada. Estudos adicionais para se entender os mecanismos subjacentes são requeridos.

  17. Cardiopatia congênita no adulto: perfil clínico ambulatorial no Hospital das Clínicas de Ribeirão Preto Congenital heart disease in adults: outpatient clinic profile at the Hospital das Clínicas of Ribeirão Preto

    OpenAIRE

    Fernando Amaral; Paulo Henrique Manso; João Antonio Granzotti; Walter Villela de Andrade Vicente; Andre Schmidt

    2010-01-01

    FUNDAMENTO: Experiências de serviços em adultos com cardiopatias congênitas não têm sido relatadas no nosso meio. OBJETIVO: Descrever o perfil clínico básico de adultos com cardiopatias congênitas atendidos ambulatorialmente em centro terciário. MÉTODOS: Anotaram-se dados referentes a idade, sexo, procedência, diagnóstico principal e diagnósticos secundários de 413 pacientes atendidos durante sete anos. RESULTADOS: G1 (não tratados): 195 pacientes, 51% mulheres, 57% entre 14 e 30 anos, 80% re...

  18. Evolução da cardiopatia chagásica crônica I - influência da parasitemia

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    José Borges Pereira

    1992-06-01

    Full Text Available No período de 8 anos (1982-1990 foi avaliada a evolução da cardiopatia chagásica crônica (CCC,pelo estudo eletrocardiográfico de repouso, edaparasitemiapeloxenodiagnóstico em 279pacientes, 85 homens e 194mulheres, com idades de 7a 76 anos (média = 42,6 anos, todos do municípios de Virgem da Lapa, Estado de Minas Gerais, Brasil. De acordo com os resultados dos eletrocardiogramas classificamos a evolução da CCC em inalterada (El - quando não havia mudança no padrão inicial do traçado, progressiva (EP - quando havia mudança de normal para alterado ou pelo agravamento das alterações € regressiva (ER - quando havia normalização ou redução da gravidade das alterações. De acordo com os resultados dosxenodiagnósticos (mínimo de 3 e máximo de 8 por paciente, 120 pacientes foram considerados com parasitemia positiva - um ou mais exames positivos e 159 com parasitemia negativa - todos os exames negativos. Os resultados mostraram: a EI em 172 (61,6% pacientes, EP em 99 (35,5% e ER em 8 (2,9%, sem diferença significativa entre o tipo de evolução e o tipo de parasitemia; ba EP foi crescente com a idade tanto no grupo com parasitemia positiva como no grupo com parasitemia negativa e significativamente maior nos homens emrelação ásmulheres, independentemente do tipode parasitemia. Com estes achados podemos afirmar que o aparecimento ou a progressão da CCC não se mostraram associadas ao tipo de parasitemia, mas sim ao sexo masculino e ao aumento da idade dos pacientes, sugerindo que a parasitemia não está relacionada com o agravamento da cardiopatia chagásica crônica.During eight years (1982-1990 the evolution of chronic chagasic cardiopathy and its relation to parasitemia was evaluated in 279patientes. 85 men and 194 women, studied by resting eletrocardiography and xenodiagnosis. All patients were residents in Virgem da Lapa, State of Minas Gerais, Brazil and their ages varied from 7 to 76 years (average 42.6y. According

  19. O carvedilol potencializa o efeito antioxidante das vitaminas E e C na cardiopatia chagásica crônica

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    Patrícia Budni

    2013-10-01

    Full Text Available FUNDAMENTO: A doença de Chagas continua a ser uma importante doença endêmica no país, sendo o acometimento cardíaco a sua manifestação mais grave. OBJETIVO: Verificar se o uso concomitante de carvedilol potencializará o efeito antioxidante das vitaminas E e C na atenuação do estresse oxidativo sistêmico na cardiopatia chagásica crônica. MÉTODOS: Foram estudados 42 pacientes com cardiopatia chagásica, agrupados de acordo com a classificação modificada de Los Andes, em quatro grupos: 10 pacientes no grupo IA (eletrocardiograma e ecocardiograma normais: sem envolvimento do coração, 20 pacientes do grupo IB (eletrocardiograma normal e ecocardiograma anormal: ligeiro envolvimento cardíaco, oito pacientes no grupo II (eletrocardiograma e ecocardiograma anormais, sem insuficiência cardíaca: moderado envolvimento cardíaco e quatro pacientes no grupo III (eletrocardiograma e ecocardiograma anormais com insuficiência cardíaca: grave envolvimento cardíaco. Os marcadores de estresse oxidativo foram medidos no sangue, antes e após um período de seis meses de tratamento com carvedilol e após seis meses de terapia combinada com vitaminas E e C. Os marcadores foram: atividades da superóxido dismutase, catalase, glutationa peroxidase, glutationa S-transferase e redutase, mieloperoxidase e adenosina deaminase, e os níveis de glutationa reduzida, de espécies reativas do ácido tiobarbitúrico, proteína carbonilada, vitamina E e óxido nítrico. RESULTADOS: Após o tratamento com carvedilol, todos os grupos apresentaram diminuições significativas dos níveis de proteína carbonilada e glutationa reduzida, enquanto os níveis de óxido nítrico e atividade da adenosina aumentaram significativamente apenas no grupo menos acometido (IA. Além disso, a maioria das enzimas antioxidantes mostrou atividades diminuídas nos grupos menos acometidos (IA e IB. Com a adição das vitaminas ao carvedilol houve diminuição dos danos em prote

  20. EFECTOS DE LA ESTIMULACION DEL PUNTO DE ACUPUNTURA FENGLONG (E40) SOBRE EL NIVEL DE COLESTEROL PLASMATICO

    OpenAIRE

    SANDOVAL QUIROZ, ENRIQUE

    2010-01-01

    LA ADA POR LAS CIFRAS DE COLESTEROL PLASMAHIPERCOLESTEROLEMIA, DETERMINTICO IGUAL O MAYOR A 200 MG POR DL, ES UN FACTOR DE RIESGO IMPORTANTE PARA LA ENFERMEDAD CARDIOVASCULAR. EN MEXICO EL 43.3 POR CIENTO DE LOS ADULTOS MAYORES DE 20 ANOS, LA PRESENTAN. LA MORTALIDAD POR ENFERMEDAD CARDIOVASCULAR, QUE INCLUYE LA CARDIOPATIA ISQUEMICA, LA ENFERMEDAD VASCULAR CEREBRAL Y LA HIPERTENSION ARTERIAL, OCUPA LA PRIMERA CAUSA DE MORTALIDAD GENERAL EN NUESTRO PAIS. EL OBJETIVO DEL PRESENTE ESTUDIO, ...

  1. Estudo pareado da cardiopatia chagásica no Rio Grande do Sul, Brasil Matched study of Chagas' cardiopathy in Rio Grande do Sul, Brazil

    Directory of Open Access Journals (Sweden)

    Giovanni Baruffa

    1985-12-01

    Full Text Available São estudados 666 pares de indivíduos, sendo 344 masculinos e 322 femininos, com sorologia positiva/negativa para doença de Chagas, obtidos em inquérito sorológico-eletrocardiográfico entre populações rurais não selecionadas de 17 municípios do sul Rio Grande do Sul, Brasil. Na análise dos eletrocardiogramas foram consideradas só as alterações sugestivas de cardiopatia chagásica: bloqueio átrio-ventricular de 1º, e 2º e 3º, BCRD isolado ou associado ao HBAE, HBAE isolado, extrasístoles ventriculares freqüentes e/ou polifocais e/ou bigeminadas e trigeminadas; alterações de ST e T; zonas eletricamente inativas. Com este critério apresentaram eletrocardiogramas alterados 201 pessoas soropositivas (30,2% e 66 soronegativas (9,9%. O gradiente de 20,3%, sendo 21,5% nos homens e 18,9% nas mulheres, mostrou-se significativo ao nível de p A study of 666 matched pairs (344 males and 322 females with positive/negative complement fixation test for Chagas' disease is reported. The pairs were obtained at random by a serological and eletrocardiographical study among rural people of an endemic area in Southern Rio Grande do Sul, Brazil (17 municipalities. Besides non specific ECG alterations, the following abnormalities suggestive of Chagas' aetiology were found: atrio-ventricular complete or incomplete block; right bundle branch block either isolated or in association with left hemiblock; frequent and/or polyfocal and/or bigeminated or trigeminated premature beats; abnormalities in ST and T; eletrically inactive areas. According to these criteria 201 seropositive (30.2% and 66 seronegative (9.9% individuals showed abnormal ECG signs. The 20.3% gradient, (21.5% in male and 18.9% in female pairs, of the matched pairs was significant at p < 0,001 level. According to these results, a significant prevalence of eletrocardiografical abnormalities suggesting chagastic cardiomiopathy occurs in seropositive individuals.

  2. Adultos com cardiopatia congênita submetidos à primeira cirurgia: prevalência e resultados em um hospital terciário Adults with congenital heart disease undergoing first surgery: prevalence and outcomes at a tertiary hospital

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    Gustavo Alves de Mello

    2012-12-01

    Full Text Available INTRODUÇÃO: O tratamento cirúrgico da cardiopatia congênita em adultos apresentou importante crescimento nos últimos anos. Contudo, ainda assim, o número de pacientes que atingem a idade adulta sem tratamento cirúrgico adequado permanece elevado. OBJETIVO: Avaliar os resultados hospitalares e diagnósticos dos pacientes adultos com cardiopatia congênita submetidos à primeira operação. MÉTODOS: Estudo retrospectivo, que analisou prontuários de pacientes operados para correção de cardiopatia congênita com idade maior ou igual a 18 anos. O critério de exclusão foi cirurgia para reoperação. Foi analisado o período entre dezembro de 2007 e dezembro de 2010, com inclusão de 79 pacientes. RESULTADOS: Os defeitos do septo atrial foram os mais prevalentes (53,1%, seguidos de comunicação interventricular (15,2%, coarctação da aorta (6,3% e canal atrioventricular parcial (6,3%. Treze (16,4% pacientes apresentavam doença associada adquirida e 14 pacientes (17,7%, congênita. Trinta e três (41,8% pacientes apresentavam hipertensão pulmonar. O tempo médio de internamento em UTI e hospitalar foi de 3,9 e 14,5 dias, respectivamente. Complicações ocorreram em 18 (22,8% pacientes, sendo as infecciosas as mais comuns. A mortalidade hospitalar foi de dois (2,5% pacientes. CONCLUSÃO: O tratamento da cardiopatia congênita em adultos como primeira cirurgia apresentou resultado bastante favorável. Contudo, em nossa série, houve maior tempo de internamento em UTI e hospitalar.INTRODUCTION: Surgical treatment of congenital heart disease in adults showed a significant growth in recent years. But even so, the number of patients who reach adulthood without adequate surgical treatment remains high. OBJECTIVE: To demonstrate the results and hospital diagnoses of adult patients with congenital heart disease underwent the first surgery. METHODS: A retrospective analysis of records of patients operated for correction of congenital heart

  3. Variabilidade entre cardiologistas na abordagem aos pacientes em prevenção secundária da cardiopatia isquêmica Variability among cardiologists in the management of patients under secondary prevention of ischemic heart disease

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    Ricardo Stein

    2004-09-01

    Full Text Available OBJETIVO: Comparar o manejo dos pacientes com cardiopatia isquêmica, atendidos por cardiologistas em ambulatório geral de cardiologia, com aquele realizado em ambulatório específico de cardiopatia isquêmica, dando ênfase à solicitação do perfil lipídico e ao tratamento farmacológico prescrito. MÉTODOS: Dados obtidos de prontuário médico de 52 pacientes consecutivos atendidos no ambulatório de cardiopatia isquêmica (grupo I e de 43 acompanhados no ambulatório de cardiologia geral (grupo II, sendo o diagnóstico anatômico de cardiopatia isquêmica, condição básica para sua inclusão. Considerou-se critério para dislipidemia, colesterol total > 200mg/dl e/ou LDL colesterol > 100 mg/dl em pacientes em uso ou não de hipolipemiantes e o uso de drogas hipolipemiantes, mesmo quando os níveis de colesterol total e/ou LDL colesterol eram OBECTIVE: To compare the management of patients with ischemic heart disease being followed up in a general cardiology outpatient clinic with that of patients being followed up in an outpatient clinic specific for ischemic heart disease, emphasizing the lipid profile and the pharmacological treatment prescribed. METHODS: Data were collected from the medical records of 52 patients consecutively treated in the outpatient clinic for ischemic heart disease (group I and of 43 patients treated in the general cardiology outpatient clinic (group II, the anatomical diagnosis of ischemic heart disease being the basic condition for their inclusion in the study. The criteria for dyslipidemia were as follows: total cholesterol > 200 mg/dL or LDL-cholesterol > 100 mg/dL, or both, in patients using or not lipid-lowering drugs, and the use of lipid-lowering drugs, even when the total cholesterol or LDL-cholesterol levels were < 200 mg/dL and 100 mg/dL, respectively, or both. The Fisher exact test was used for comparing the variables, and a 2-tailed p < 0.05 was accepted as significant. RESULTS: Demographic

  4. Operação de Blalock-Taussig modificada para o tratamento paliativo de cardiopatias congênitas com hipofluxo pulmonar Blalock-Taussig operation for palliative treatment of congenital heart disease with low pulmonary flow

    OpenAIRE

    Miguel A Maluf; Andrade, José Carlos S.; Antônio Carvalho; Roberto Catani; Hermínio Vega; José L. Andrade; Célia Silva; Werther B. de Carvalho; Ênio Buffolo

    1995-01-01

    De janeiro de 1990 a novembro de 1994, 72 pacientes portadores de cardiopatias congênitas com hipofluxo pulmonar foram submetidos à operação de Blalock-Taussig. A idade variou entre 2 dias e 11 anos (M:9,0 meses); 44 (61,1%) eram do sexo masculino e 28 (38,8%) do feminino; 38 (52,8%) casos portadores de tétrade de Fallot; 7 (9,7%) atresia pulmonar com septo interventricular íntegro (AP c/ SIVI); 6 (8,4%) transposição das grandes artérias (TGA) + estenose pulmonar (EP); 6 (8,4%) atresia tricús...

  5. Síndrome de deleção 22q11.2 e cardiopatias congênitas 22q11.2 deletion syndrome and congenital heart defects

    OpenAIRE

    Rafael Fabiano M. Rosa; Zen, Paulo Ricardo G.; Carla Graziadio; Giorgio Adriano Paskulin

    2011-01-01

    OBJETIVO: Revisar as características clínicas, etiológicas e diagnósticas da síndrome de deleção 22q11 e sua associação com as cardiopatias congênitas. FONTES DOS DADOS: Foram pesquisados artigos científicos presentes nos portais Medline, Lilacs e SciELO, utilizando-se descritores específicos como "22q11", "DiGeorge syndrome", "velocardiofacial syndrome", "congenital heart defects" e "cardio-vascular malformations". O período adotado para a revisão foi de 1980 a 2009. SÍNTESE DOS DADOS: As ma...

  6. Ischemic heart disease in women La cardiopatía isquémica en la mujer A cardiopatia isquêmica na mulher

    Directory of Open Access Journals (Sweden)

    David Sancho Cantus

    2011-12-01

    feminino e masculino. Existem diferenças de gênero na apresentação, na evolução e na maneira como a doença é abordada. Este trabalho teve como objetivo principal revisar a literatura sobre a DC e o seu enfoque de gênero. Os autores pesquisaram diferentes textos caracterizados por uma abordagem qualitativa, publicados entre 2003 e 2009, nas bases de dados PubMed, IME, CUIDEN e CINAHL. Como principais resultados são identificados os fatores que dificultam o diagnóstico precoce da doença isquêmica nas mulheres, e as possíveis consequências desse diagnóstico tardio são apontadas. Nos 56 textos selecionados, inicialmente mostra-se a dificuldade da mulher relacionada ao reconhecimento dos primeiros sintomas da doença coronária, e a baixa percepção do risco dessa doença. É necessária maior sensibilização sobre a cardiopatia isquêmica (CI, para se reduzir o elevado índice de morbidade e mortalidade.

  7. The need of alkalinity determination in the characterization of rain; Necesidad de la determinacion de la alcalinidad en la caracterizacion de la lluvia

    Energy Technology Data Exchange (ETDEWEB)

    Pal Verma, Mahendra [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1998-01-01

    In this paper is presented the alkalinity determination of the carbonic species in the rain waters by the Gran titration method. The alkalinity values obtained by this method in low electric conductivity waters are fairly reliable. Also, the existing studies on the characterization of acid rains, are discussed. [Espanol] En este trabajo se presenta la medicion de la alcalinidad y la determinacion de las especies carbonicas en las aguas de lluvia por el metodo de la titulacion de Gran. Los valores de alcalinidad obtenidos por este metodo en las aguas de baja conductividad electrica son bastante confiables. Asimismo, se discuten los estudios existentes sobre la caracterizacion de la lluvia acida en la republica mexicana.

  8. Conhecimento dos pais sobre profilaxia de endocardite infecciosa em crianças portadoras de cardiopatias congênitas Parents' knowledge of infective endocarditis in children with congenital heart disease

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    Fabiana Haag

    2011-09-01

    Full Text Available INTRODUÇÃO: As diretrizes para profilaxia de endocardite infecciosa mudaram, mas muitas cardiopatias congênitas seguem sendo consideradas de alto risco para o desenvolvimento da doença. OBJETIVO: Avaliar o conhecimento dos pais ou responsáveis pelas crianças e adolescentes portadores de cardiopatias atendidos em um serviço de referência no estado do Rio Grande do Sul, Brasil, sobre endocardite infecciosa e sua profilaxia. MÉTODOS: Estudo transversal com 90 pacientes portadores de cardiopatias congênitas em acompanhamento ambulatorial regular. O conhecimento dos pais foi avaliado com o uso de questionário específico e os demais dados foram obtidos por meio da revisão de prontuários. RESULTADOS: A mediana da idade dos pacientes foi de 5,6 anos (3 meses - 14 anos e 7 meses, sendo 57,7% do sexo masculino. A mediana de tempo de acompanhamento no serviço foi de 3,49 anos (1,20-7,38 anos. Os anos de estudo formal dos pais apresentaram média de 7,67 ± 3,25 anos. De acordo com o escore previamente estabelecido, o conhecimento dos pais entrevistados foi considerado satisfatório em 37,7% dos casos, regular, em 33,3% e insatisfatório, em 28,8%. Houve correlação significativa entre o índice de conhecimento dos pais e tempo de acompanhamento das crianças no serviço (r=0,584; PINTRODUCTION: The guidelines to prophylaxis of infectious endocarditis changed, but many congenital heart diseases continue to be considered as high risk for the development of the disease. OBJECTIVE: To evaluate the knowledge of parents or guardians of children and adolescents with congenital heart disease seen at a referral center in Rio Grande do Sul, Brazil on infective endocarditis and its prevention. METHODS: Cross-sectional study with 90 patients with congenital heart defects in regular outpatient treatment. The parents' knowledge was assessed using a specific questionnaire and other data were obtained through medical records. RESULTS: The median age of

  9. Síndrome de deleção 22q11 e cardiopatias congênitas complexas 22q11.2 deletion syndrome and complex congenital heart defects

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    Rafael Fabiano Machado Rosa

    2011-02-01

    Full Text Available OBJETIVO: Verificar a frequência da síndrome de deleção 22q11 (SD22q11 entre pacientes portadores de cardiopatia congênita do tipo complexa. MÉTODOS: A amostra foi constituída por uma coorte prospectiva e consecutiva de pacientes com cardiopatia complexa em sua primeira hospitalização em uma unidade de tratamento intensivo cardiológica de um hospital pediátrico. Para cada paciente foi preenchida uma ficha de avaliação, com coleta de dados clínicos, e realizado o cariótipo de alta resolução e técnica de hibridização in situ fluorescente (FISH com pesquisa de microdeleção 22q11. Os defeitos cardíacos foram classificados por um cardiologista participante do estudo. RESULTADOS: A amostra foi composta de 66 pacientes. Quanto à análise cariotípica, alterações foram observadas em cinco pacientes (7,6%; contudo, nenhum deles apresentava deleção 22q11. A avaliação pela técnica de FISH pôde ser realizada com sucesso em 65 pacientes, sendo que a microdeleção 22q11 foi identificada em dois (3,1%. Dos 66 pacientes com defeitos complexos, 52 eram portadores de malformações do tipo conotruncal, sendo que em 51 a pesquisa para microdeleção 22q11 foi realizada. Os dois pacientes portadores da microdeleção 22q11 fizeram parte deste grupo, representando uma frequência de 3,9%. Eles apresentavam tetralogia de Fallot. CONCLUSÃO: A SD22q11 é uma anormalidade frequente entre pacientes com cardiopatias congênitas complexas e conotruncais. Variações da frequência da SD22q11 entre os estudos parecem estar associadas, principalmente, com a forma adotada para a seleção da amostra e às características da população em análise.OBJECTIVE: Investigate the frequency of 22q11 deletion syndrome among patients with complex congenital heart disease. METHODS: A prospective and consecutive cohort of patients with complex heart defects was evaluated in their first hospitalization at a cardiac intensive care unit of a pediatric

  10. O papel da biopsia pulmonar na indicação cirúrgica de cardiopatias congénitas The role of lung biopsy in the decision-making process for congenital heart disease

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    Solange Bordignon

    1992-12-01

    Full Text Available Objetivando relacionar o aspecto morfológico dos vasos pulmonares com os dados clínicos para auxiliar na decisão da cirurgia de cardiopatias congênitas com hipertensão pulmonar severa, em casos previamente avaliados por critérios clínicos, angiográficos e/ou hemodinâmicos, foram realizadas, de 1980 a 1991, no Instituto de Cardiologia do Rio Grande do Sul, 49 biópsias pulmonares. As idades dos pacientes variaram de 5m a 28a6m (média = 7a7m e os diagnósticos foram: CIV (16, PCA (3, CIVe ESubAo (1, PCA e CIV (2, PCA e Cl A (1 DSAV (7, DSAV incompl. e PCA (1, PCA e CoAo (1, Inter Arco Ao com PCA e CIV e/ou ESupraM e Anel SubAo (2, DVSVD com CIV e/ou PCA (6, DVSVE e EP (1, ATe ESubP. (1, TGV (1, TGV corrigida e CIV (1 e truncus arteriosus (5. Houve 3 (6,1 % óbitos no pós-operatório da biopsia. Baseado na classificação de Heath-Edwards, foram para correção cirúrgica 11 pacientes com cardiopatias simples (CIV, PCA, DSAV, cuja mortalidade foi 36,4%. Dez pacientes com cardiopatias complexas (DVSVD, DVSVE, TGV, truncus, inter arco Ao foram para cirurgia, com mortalidade de 30%. A evolução pós-operatória tardia foi favorável em 13 (62% pacientes. Conclui-se que a biopsia pulmonar pode ser útil na indicação cirúrgica das cardiopatias congênitas com hipertensão pulmonar severa e, por envolver riscos, sua utilização deve ser criteriosa. E valiosa para os pacientes que apresentam dúvidas quanto ao grau de doença vascular pulmonar ou quanto à natureza das lesões e o estudo clínico e hemodinâmico não são esclarecedores, ou mesmo quando apontarem para a contra-indicação cirúrgica.Open lung biopsy has been performed in patients with congenital heart disease and severe pulmonary hypertension in order to complement the decision-making process for surgical correction. All patients had clinical, hemodynamic and angiographic evaluation previously and would not be surgical candidates by conventional criteria. The 49 patients

  11. Rastreamento e diagnóstico ecocardiográfico das arritmias e cardiopatias congênitas fetais Screening and echocardiographic diagnosis of arrhythmias and congenital heart diseases in the fetus

    Directory of Open Access Journals (Sweden)

    Sandra Regina Marques Carvalho

    2006-05-01

    Full Text Available OBJETIVO: analisar os resultados obtidos em programa de rastreamento e diagnóstico de arritmias e cardiopatias congênitas centrado em uma unidade terciária e determinar a importância do diagnóstico precoce na evolução fetal e neonatal. MÉTODOS: foram analisados os resultados da avaliação cardíaca fetal efetuada em 1159 gestantes em dois níveis diferentes. Nível I: uso da ultra-sonografia morfológica com o objetivo de rastrear a presença de alteração cardíaca, sem estabelecer um diagnóstico diferencial. Nível II: por ecocardiograma fetal com o objetivo de diagnosticar as cardiopatias fetais existentes. Os resultados da detecção de arritmias bem como da avaliação das alterações estruturais foram comparados, sendo estabelecidas a sensibilidade e a especificidade para ambos os níveis no pré-natal, ao exame pós-natal ou à necropsia. A concordância entre ambos os níveis foi calculada pelo índice kappa. RESULTADOS: as arritmias detectadas no nível I foram confirmadas em todos os casos e não houve falso-negativos, sendo que em cinco pacientes houve necessidade de tratamento intra-útero. A detecção das alterações estruturais obtidas no nível I teve sensibilidade de 72% e especificidade de 98%, com 28% de falso-positivos. No nível II estes parâmetros foram, respectivamente, de 100 e 99%. De acordo com o coeficiente kappa de 57%, um grau de concordância de categoria moderada foi observado entre ambos os níveis. Das cardiopatias congênitas da nossa série 51% necessitaram intervenção farmacológica ou invasiva no período neonatal. CONCLUSÃO: o estudo ultra-sonográfico obstétrico é fundamental no rastreamento das alterações cardíacas fetais. O ecocardiograma fetal apresentou alto índice de sensibilidade e especificidade no diagnóstico das arritmias e cardiopatias congênitas, possibilitando o tratamento precoce das alterações graves.PURPOSE: to analyze the results of a screening and diagnostic

  12. Operação de Blalock-Taussig modificada para o tratamento paliativo de cardiopatias congênitas com hipofluxo pulmonar Blalock-Taussig operation for palliative treatment of congenital heart disease with low pulmonary flow

    Directory of Open Access Journals (Sweden)

    Miguel A Maluf

    1995-09-01

    Full Text Available De janeiro de 1990 a novembro de 1994, 72 pacientes portadores de cardiopatias congênitas com hipofluxo pulmonar foram submetidos à operação de Blalock-Taussig. A idade variou entre 2 dias e 11 anos (M:9,0 meses; 44 (61,1% eram do sexo masculino e 28 (38,8% do feminino; 38 (52,8% casos portadores de tétrade de Fallot; 7 (9,7% atresia pulmonar com septo interventricular íntegro (AP c/ SIVI; 6 (8,4% transposição das grandes artérias (TGA + estenose pulmonar (EP; 6 (8,4% atresia tricúspide (AT + EP; 6 (8,4% dupla via de entrada (DVE do ventrículo direito (VD ou ventrículo esquerdo (VE + (EP; 3 (4,2% transposição corrigida das grandes artérias (TCGA + comunicação interventricular (CIV + EP; 2 (2,7% dupla via de saída (DVS de VD ou VE + EP; 2 (2,7% defeito septal atrioventricular (DSAV + EP; 2 (2,7% isomerismo direito (D ou (E + EP. Os critérios de indicação foram: a neonatos com cardiopatias "dueto dependente"; b lactentes com piora de cianose ou crise de hipoxia; c crianças durante a infância com cardiopatias sem chance de uma correção biventricular. A técnica empregada foi a operação de Blalock-Taussig modificada, interpondo prótese entre artéria subclávia e artéria pulmonar. A prótese de Polytetrafluoroethylene (PTFE foi usada em 69 (94,5% casos, veia umbilical em 3 (4,1% casos e artéria mamária bovina em 1 (1,4% caso. Durante o ato operatório foi administrada dose única de heparina (1mg x kg peso, não sendo neutralizada no pós-operatório (PO e no seguimento tardio, dispensado o uso de anticoagulantes ou antiagregantes plaquetários. Houve 8 (11,1% óbitos no PO imediato: 5 (6,9% casos por obstrução da prótese (3 foram reoperados, 2 (2,7% casos por morte súbita (AP c/ SIVI e 1 (1,3% devido a processo infeccioso pulmonar. A obstrução da prótese como principal causa de óbito esteve diretamente relacionada à anatomia dos vasos (calibre da artéria subclávia e pulmonar e ou problemas de técnica cir

  13. Exhaustividad de la notificación de los casos de sida en Cataluña: un estudio basado en las solicitudes de determinaciones de linfocitos CD4 y en la prescripción de antirretrovirales

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    García de Olalla Rizo Patricia

    1998-01-01

    Full Text Available FUNDAMENTO: Determinar la tasa de notificación de SIDA en Cataluña. MÉTODO: Se utilizan como fuentes de contraste las solicitudes de las determinaciones de linfocitos T CD4+ y la prescripción de antirretrovirales en siete hospitales universitarios de Cataluña entre el 1 de enero y el 31 de junio de 1994. Se consideró que un caso no estaba declarado cuando en la historia clínica existía un diagnóstico de sida (según la definición de Europa 93 y dicho caso no se encontraba incluido en el registro de sida de Cataluña. RESULTADOS: De los 1.370 casos analizados, se detectaron 50 casos de sida no declarados. La tasa de notificación global fue del 98,6%, con un intervalo de confianza del 95% (IC del 95%:98,2-99,0. La mayoría de los casos no declarados eran hombres (72% con una edad media de 37,3 años (DS:11,8, el 52% eran usuarios de drogas por vía parenteral (UDVP, siendo la tuberculosis extrapulmonar la enfermedad diagnóstica más frecuente (16%, el 81,4% presentaban un nivel de linfocitos T CD4+ menor o igual a 200 células /mm3. El 92% de estos casos se detectaron a partir de los registros de determinaciones de linfocitos T CD4+. CONCLUSIONES: La exhaustividad detectada se considera adecuada. Se recomienda usar los registros de determinaciones linfocitarias para este tipo de estudios.

  14. Ecuaciones para eliminar la interferencia de sueros hemolisados, ictéricos e hiperglucémicos en las determinaciones rutinarias de química clínica

    OpenAIRE

    Martha A. Sánchez Rodríguez; Rosa Colunga Reyes; Ma. del Pilar Cedillo Martínez

    2002-01-01

    Introducción: Las muestras hemolisadas, ictéricas o hiperglucémicas, pueden modificar cuantitativamente los resultados de una medición analítica por interferencia, ya que los métodos utilizados para las determinaciones en química clínica están basados en técnicas espectrofotométricas. Objetivo: Cuantificar la interferencia in vitro producida por la presencia en el suero de glucosa, bilirrubina y hemoglobina, a diferentes concentraciones, en las técnicas de urea, creatinina, ácido úrico y cole...

  15. Tratamento das cardiopatias congênitas em Sergipe: proposta de racionalização dos recursos para melhorar a assistência Heart defects treatment in Sergipe: propose of resources' rationalization to improve care

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    Debora Cristina Fontes Leite

    2012-06-01

    Full Text Available OBJETIVO: Avaliar o tratamento das cardiopatias congênitas realizadas de 2000 a 2009. MÉTODOS: A amostra constituiu-se de todos os pacientes submetidos a correção cirúrgica para cardiopatias congênitas por dez anos em Sergipe, Brasil. Os pacientes foram operados em três hospitais localizados na cidade de Aracaju (SE, Brasil, capital do estado de Sergipe. O estudo foi dividido em dois períodos, definidos pela data do início da centralização das cirurgias. As variáveis coletadas foram: faixa etária, gênero, diagnóstico pós-operatório, destino, tipo de cirurgia e hospital em que foi realizado o procedimento e a classificação RACHS -1. RESULTADOS: No período I, a estimativa do déficit de cirurgia foi de 69%, ocorrendo decréscimo no período II para 55,3%. O diagnóstico pós-operatório mais frequente foi de fechamento de comunicação interventricular (20,5%, fechamento de canal arterial (20,2% e da comunicação interatrial (19%. Houve correlação estatisticamente significativa entre mortalidade esperada pelo RACHS-1 e a observada na amostra. A avaliação do RACHS-1 como fator preditor da mortalidade hospitalar por meio da curva ROC demonstrou área de 0,860 IC 95% 0,818 a 0,902, com P OBJECTIVE: This study aims evaluate the treatment of congenital heart disease conducted from 2000 to 2009. METHODS: The sample consisted of all patients undergoing surgical correction for congenital heart disease for ten years in Sergipe, Brazil. The patients were operated in three hospitals located in the city of Aracaju, capital of the state of Sergipe (Brazil. The study was divided into two periods defined by the start date of centralization of surgery. The variables collected were: age, sex, postoperative diagnosis, destination, type of surgery and hospital where the procedure was performed and the classification RACHS -1. RESULTS: In the period I, the estimate deficit of surgery was 69% decrease occurring in the period II to 55.3%. The

  16. Comparação do desfecho entre a cardiopatia chagásica e a miocardiopatia dilatada idiopática Comparison of outcome between Chagas cardiomyopathy and idiopathic dilated cardiomyopathy

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    Amanda Pires Barbosa

    2011-12-01

    Full Text Available FUNDAMENTO: Pouco se sabe sobre o desfecho dos pacientes com cardiopatia chagásica, em comparação aos pacientes com miocardiopatia dilatada idiopática na era contemporânea. OBJETIVO: Comparar o desfecho dos pacientes chagásicos com insuficiência cardíaca sistólica crônica decorrente da cardiopatia chagásica ao observado em pacientes com MDI na era contemporânea. MÉTODOS: Foi incluído um total de 352 pacientes (246 com cardiomiopatia chagásica e 106 com miocardiopatia dilatada idiopática, seguidos prospectivamente em nossa Instituição, de janeiro de 2000 a janeiro de 2008. Todos os pacientes receberam tratamento clínico contemporâneo padrão. RESULTADOS: Na análise multivariada com o modelo de risco proporcional de Cox, o uso da digoxina (relação de risco = 3,17; intervalo de confiança de 95%, de 1,62 a 6,18; p = 0,001 necessitou de suporte inotrópico (relação de risco = 2,08; intervalo de confiança de 95%, de 1,43 a 3,02; p BACKGROUND: Little is known about the outcome of patients with Chagas cardiomyopathy in comparison to that of patients with Idiopathic Dilated Cardiomyopathy in the contemporary era. OBJECTIVE: To compare the outcome of chagasic patients with chronic systolic heart failure secondary to Chagas cardiomyopathy with that observed in patients with IDC in the contemporary era. METHODS: A total of 352 patients (246 with Chagas cardiomyopathy, 106 with Idiopathic Dilated Cardiomyopathy prospectively followed at our Institution from January, 2000 to January, 2008 were included. All patients received standard contemporary medical therapy. RESULTS: In Cox proportional hazards model multivariate analysis, digoxin use (Hazard Ratio=3.17; 95% Confidence Interval 1.62 to 6.18; p=0.001, need of inotropic support (Hazard Ratio=2.08; 95% Confidence Interval 1.43 to 3.02; p<0.005, left ventricular ejection fraction (Hazard Ratio=0.97; 95% Confidence Interval 0.95 to 0.99; p<0.005, and Chagas cardiomyopathy etiology

  17. Nutritional status of children with congenital heart disease Estado nutricional de niños con cardiopatías congénitas Estado nutricional de crianças com cardiopatias congênitas

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    Flávia Paula Magalhães Monteiro

    2012-12-01

    de Apgar. La desnutrición crónica se refirió a los niños del sexo femenino con edades mayores. CONCLUSIÓN: se evidencia la necesidad de realizar estrategias nutricionales que posibiliten mejor pronóstico, en la tentativa de ampliar las atenciones de enfermería dirigidos a estos niños.OBJETIVO: caracterizar o estado nutricional e verificar variáveis que predizem alterações nutricionais em crianças portadoras de cardiopatias. MÉTODO: trata-se de estudo transversal, realizado em duas instituições de saúde, de janeiro a junho de 2009, utilizando formulário com questões nutricionais. Selecionaram-se 132 crianças menores de dois anos e que apresentavam cardiopatia congênita, excluindo-se aquelas com outras doenças graves. RESULTADO: os valores de percentis e escores Z predominantes concentraram-se dentro da faixa de normalidade. Entretanto, os valores de escores Z apresentaram variações negativas com desvio para a esquerda. Na análise de fatores preditores, a ocorrência de desnutrição imediata e aguda esteve relacionada à diminuição da prega cutânea subescapular, a desnutrição imediata relacionou-se ao elevado escore de Apgar. A desnutrição crônica referiu-se às crianças do sexo feminino com idademaior. CONCLUSÃO: evidencia-se a necessidade de realizar estratégias nutricionais que possibilitem melhor prognóstico, na tentativa de ampliar os cuidados de enfermagem direcionados a essas crianças.

  18. Estudo comparativo entre o método convencional e o método da peroxidase anti-peroxidase na pesquisa do parasitismo tissular na cardiopatia chagásica crônica

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    A. J. A. Barbosa

    1986-04-01

    Full Text Available Na maioria dos chagásicos crônicos o Trypanosoma cruzi não é detectado no tecido ou apresenta se com extrema raridade, mesmo quando é pesquisado exaustivamente. Sendo os métodos utilizados, até então, inespecíficos para a demonstração do T. cruzi, propôs-se no presente trabalho proceder ao estudo comparativo entre o método convencional (HE e o método imunocitoquímico pela peroxidase anti-peroxidase (PAP, na avaliação quantitativa do parasitismo. Selecionaram-se 3 casos de cardiopatia chagásica crônica e, de um mesmo fragmento de cada caso, obtiveram se cortes que foram corados pelo H.E. (média de 100 cortes por caso e, consecutivamente, outros que foram corados pelo PAP (média de 70 cortes por caso. O caso n.° 1 foi autopsiado em 1952 e apresentava parasitismo freqüente. Nos demais, o exame rotineiro foi negativo. Obtiveram-se os seguintes resultados expressos em n.° de ninhos/100 cortes, respectivamente, corados pelo H.E. e pelo P.A.P. (HE/PAP. Caso n.° 1 - 80/171; caso n.° 2 = 5/116 e caso n.° 3 = 1/2. Os resultados mostram que o método imunocitoquímico empregado, além de facilitar o diagnóstico do parasitismo, demonstra também pequenos ninhos de amastigotas que dificilmente seriam diagnosticados pelos métodos convencionais; além disso mostrou-se útil mesmo em tecido incluídos em parafina há longo tempo.

  19. Padrão circadiano dos episódios de taquicardia ventricular em portadores de cardiopatia chagásica Circadian pattern of ventricular tachycardia episodes in patients with chagas heart disease

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    Mauricio Abello

    2007-02-01

    Full Text Available Cardiomiopatia chagásica crônica (CCC causa arritmias ventriculares e morte súbita, sendo a mais freqüente causa de óbito em muitas áreas endêmicas1,2. A variação circadiana na incidência de arritmias ventriculares e morte súbita difere de acordo com o substrato (p. ex: picos matinais e noturnos na cardiopatia isquêmica e na cardiomiopatia dilatada não-chagásica. Cardioversores-desfibriladores implantáveis de terceira geração (CDI conseguem registrar o dia e a hora de cada episódio de taquicardia ventricular (TV, permitindo uma análise dos padrões de ocorrência de taquiarritmias. O objetivo deste estudo foi avaliar a variação circadiana da TV espontânea em portadores de CCC tratados com CDI.Chronic Chagas' cardiomyopathy (CCM causes ventricular arrhythmias and sudden death, and constitutes the most frequent cause of death in many endemic areas1,2. The circadian variation in the incidence of ventricular arrhythmias and sudden death differs according to the substrate (e.g., morning and evening peaks in ischemic heart disease and non-Chagasic dilated cardiomyopathy. Third generation implantable cardioverter defibrillators (ICDs have the ability to store the time and date of each ventricular tachycardia (VT episode, enabling the patterns of ventricular tachyarrhythmia occurrence to be analyzed. The aim of our study was to evaluate the circadian variation of spontaneous VT in recipients of an ICD with CCM.

  20. Realce Tardio miocárdico por Ressonância Magnética Cardíaca pode identificar risco para Taquicardia Ventricular na Cardiopatia Chagásica Crônica

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    Ronaldo Peixoto de Mello

    2012-05-01

    Full Text Available FUNDAMENTO: Testes invasivos e não invasivos têm sido usados para identificar risco para Taquicardia Ventricular (TV em pacientes com Cardiopatia Chagásica Crônica (CCC. Ressonância Magnética Cardíaca (RMC pela técnica do Realce Tardio (RT pode ser útil para selecionar pacientes com disfunção ventricular global ou segmentar, com alto grau de fibrose e maior risco para TV clínica. OBJETIVO: Melhorar a identificação de elementos preditivos de TV em pacientes com CCC. MÉTODO: Quarenta e um pacientes com CCC foram pesquisados, sendo 30 (72% do sexo masculino, com média de idade de 55,1 ± 11,9 anos. Vinte e seis pacientes apresentavam histórico de TV (grupo TV, e 15 não apresentavam TV (grupo NTV. Todos os pacientes incluídos tinham RT e disfunção segmentar ventricular. Volume, porcentagem de comprometimento da espessura da parede ventricular em cada segmento, e distribuição de RT foi determinado em cada caso. RESULTADOS: Não houve diferença estatística em termos de volume de RT entre os dois grupos: grupo TV = 30,0 ± 16,2%; grupo NTV = 21,7 ± 15,7%; p = 0,118. A probabilidade de TV foi maior se duas ou mais áreas contíguas de fibrose transmural estivessem presentes, sendo um fator preditor de TV clínica (RR 4,1; p = 0,04. A concordância entre os observadores foi de 100% nesse critério (p < 0,001. CONCLUSÃO: A identificação de dois ou mais segmentos de RT transmural por RMC está associado com a ocorrência de TV clínica em pacientes com CCC. Portanto, a RMC melhora a estratificação de risco na população estudada. (Arq Bras Cardiol. 2012; [online].ahead print, PP.0-0

  1. O conduto valvulado bovino contegra, um biomaterial para o tratamento cirúrgico de cardiopatias congênitas The contegra valved bovine conduit: a biomaterial for the surgical treatment of congenital heart defects

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    Shi-Min Yuan

    2012-01-01

    Full Text Available O Contegra, um enxerto de veia jugular bovina, tem sido amplamente utilizado como biomaterial de preferência no tratamento cirúrgico das cardiopatias congênitas, especialmente como um conduto para a reconstrução da via de saída ventricular direita. Este artigo tem como objetivo fazer uma revisão abrangente sobre os desfechos clínicos do Contegra. Foram recuperados, coletados e analisados, relatos de Contegra publicados desde 2002. Havia 1.718 Contegra, aplicados em 1.705 pacientes. Os tamanhos dos condutos foram de 8-22 mm. As idades dos pacientes foram de recém-nascidos até 74,5 anos, com prevalência de pacientes pediátricos. O diagnóstico primário foi cardiopatia congênita em todos os casos, sendo os três diagnósticos principais: tetralogia de Fallot, tronco arterioso e atresia pulmonar, que representaram 25,6%, 16,7% e 13,1%, respectivamente. O Contegra foi utilizado como enxerto tubular na posição pulmonar em 1635 (95,9% pacientes, como remendo monocúspide em 12 (0,7%, como enxerto na posição da valva pulmonar ou monocúspide em 40 (2,3%, e, como conduto artéria pulmonar-veia cava inferior na operação de Fontan, em 18 (1,1% pacientes, respectivamente. O reimplante de conduto foi realizado em 141 (8,3% pacientes, 33,8 ± 37 (8,6-106,8 meses após a inserção do conduto inicial. A plástica do conduto foi necessária em seis (0,4% e a reintervenção em 83 (4,9% dos pacientes. As indicações do reimplante do conduto incluíram estenose importante da anastomose distal, pseudoaneurisma da anastomose proximal e regurgitação importante do conduto. Quanto ao bom desempenho, disponibilidade e longevidade, o Contegra é um biomaterial adequado para a reconstrução da via de saída ventricular direita e como remendo para reparo de comunicação interventricular, mas não é apto para a operação de Fontan.Contegra, a bovine jugular vein graft, has been widely used as a preferable biomaterial in the surgical treatment of

  2. O conduto valvulado bovino contegra, um biomaterial para o tratamento cirúrgico de cardiopatias congênitas The contegra valved bovine conduit: a biomaterial for the surgical treatment of congenital heart defects

    Directory of Open Access Journals (Sweden)

    Shi-Min Yuan

    2012-12-01

    Full Text Available O Contegra, um enxerto de veia jugular bovina, tem sido amplamente utilizado como biomaterial de preferência no tratamento cirúrgico das cardiopatias congênitas, especialmente como um conduto para a reconstrução da via de saída ventricular direita. Este artigo tem como objetivo fazer uma revisão abrangente sobre os desfechos clínicos do Contegra. Foram recuperados, coletados e analisados, relatos de Contegra publicados desde 2002. Havia 1.718 Contegra, aplicados em 1.705 pacientes. Os tamanhos dos condutos foram de 8-22 mm. As idades dos pacientes foram de recém-nascidos até 74,5 anos, com prevalência de pacientes pediátricos. O diagnóstico primário foi cardiopatia congênita em todos os casos, sendo os três diagnósticos principais: tetralogia de Fallot, tronco arterioso e atresia pulmonar, que representaram 25,6%, 16,7% e 13,1%, respectivamente. O Contegra foi utilizado como enxerto tubular na posição pulmonar em 1635 (95,9% pacientes, como remendo monocúspide em 12 (0,7%, como enxerto na posição da valva pulmonar ou monocúspide em 40 (2,3%, e, como conduto artéria pulmonar-veia cava inferior na operação de Fontan, em 18 (1,1% pacientes, respectivamente. O reimplante de conduto foi realizado em 141 (8,3% pacientes, 33,8 ± 37 (8,6-106,8 meses após a inserção do conduto inicial. A plástica do conduto foi necessária em seis (0,4% e a reintervenção em 83 (4,9% dos pacientes. As indicações do reimplante do conduto incluíram estenose importante da anastomose distal, pseudoaneurisma da anastomose proximal e regurgitação importante do conduto. Quanto ao bom desempenho, disponibilidade e longevidade, o Contegra é um biomaterial adequado para a reconstrução da via de saída ventricular direita e como remendo para reparo de comunicação interventricular, mas não é apto para a operação de Fontan.Contegra, a bovine jugular vein graft, has been widely used as a preferable biomaterial in the surgical treatment of

  3. Síndrome de deleção 22q11.2 e cardiopatias congênitas 22q11.2 deletion syndrome and congenital heart defects

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    Rafael Fabiano M. Rosa

    2011-06-01

    Full Text Available OBJETIVO: Revisar as características clínicas, etiológicas e diagnósticas da síndrome de deleção 22q11 e sua associação com as cardiopatias congênitas. FONTES DOS DADOS: Foram pesquisados artigos científicos presentes nos portais Medline, Lilacs e SciELO, utilizando-se descritores específicos como "22q11", "DiGeorge syndrome", "velocardiofacial syndrome", "congenital heart defects" e "cardio-vascular malformations". O período adotado para a revisão foi de 1980 a 2009. SÍNTESE DOS DADOS: As malformações cardíacas são os defeitos congênitos observados mais frequentemente ao nascimento e representam um problema importante de Saúde Pública. Dentre suas principais causas conhecidas destaca-se a síndrome de deleção 22q11, também chamada de síndrome de DiGeorge, síndrome velocardiofacial e CATCH22. Trata-se de uma doença autossômica domi-nante caracterizada por um fenótipo altamente variável, o que dificulta em muito seu reconhecimento clínico. Além disso, a maior parte dos pacientes apresenta uma microdeleção identificada principalmente por técnicas de citogenética molecular, como a hibridização in situ fluorescente, pouco disponíveis em nosso meio. De forma similar a outras síndromes, a síndrome de deleção 22q11 associa-se a certos defeitos cardíacos específicos, no caso os do tipo conotruncal. Apesar disso, não há ainda na literatura um consenso sobre quais os pacientes com car-diopatia congênita que deveriam ser investigados para a síndrome de deleção 22q11. CONCLUSÕES: Cardiologistas e cirurgiões cardíacos, espe-cialmente pediátricos, devem estar cientes das peculiaridades e dos cuidados dispensados à síndrome de deleção 22q11. Os indivíduos com a síndrome apresentam comumente alterações envolvendo vários sistemas, o que pode levar a dificuldades e a complicações durante seu manejo clínico e cirúrgico.OBJECTIVE: To review clinical, etiological and diagnostic characteristics of

  4. Determinaciones termogravimétricas y de calor específico de un concentrado comercial de ulexita, entre temperatura ambiente y 1.000 ºC

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    Flores, H. R.

    2006-12-01

    Full Text Available The important amount of hydration water in the ulexite (NaCaB5O9.8H2O, allows using calcination methods to increase its B2O3 content. This paper analyses the thermal decomposition reaction of a preconcentrated ulexite through weight loss measurements, which occur during the heating of samples until 1000 ºC. Determinations of heat content at each temperature were made using an isoperibol calorimeter. The mean specific heat was calculated from these values, and its dependence on temperature was determined. The maximum weight loss was about 32.5 % and the specific heat obtained was 1,13 kJ/kgºC for solid samples and 1,38 kJ/kgºC for fluid samples.The results are useful for the design of the industrial process, in order to determine the thermal requirements for heating calcined ulexite, and to obtain smelted ulexite.

    El elevado contenido de agua de hidratación de la ulexita (NaCaB5O9.8H2O permite utilizar la calcinación como método de concentración. En este trabajo se analiza la reacción de descomposición térmica de un preconcentrado de ulexita a través de determinaciones de la pérdida de peso ocurrida durante el calentamiento de la muestra hasta 1000 ºC. Por otra parte, se ha determinado el valor del calor sensible a cada temperatura ensayada mediante un calorímetro tipo isoperibol y se ha calculado el calor específico medio de la muestra calcinada, así como su variación con la temperatura. Se obtuvieron pérdidas de peso de 32,5 % y valores del calor específico de 1,13 kJ/kgºC para muestras sólidas y 1,38 kJ/kgºC para las fluidas. Los resultados son de utilidad para el diseño del proceso industrial, para la determinación del requerimiento térmico para el calentamiento de ulexita calcinada y para la obtención de una frita.

  5. {sup 99m}TC tetrofosmin cardiac tomography after nitrate administration in patients with coronary artery disease and left ventricular dysfunction; Tomografia cardiaca {sup 99m}Tc tetrofosmina dopo somministrazione di nitrati in pazienti con cardiopatia ischemica e disfunzione ventricolare sinistra

    Energy Technology Data Exchange (ETDEWEB)

    Menna, F.; Acampa, W.; Florimonte, L.; Ferro, A.; Borrelli, G.; Mainolfi, C.; Cuocolo, A. [Naples Univ. Federico II, Naples (Italy). Dipt. di Scienze Biomorfologiche e Funzionali; Consiglio Nazionale delle Ricerche, Naples (Italy). Centro per la Medicina Nucleare; IRCCS Neuromed, Pozzilli, IS (Italy)

    2000-04-01

    The work examines twenty-two patients with coronary artery disease, previous myocardial infarction and LV dysfunction, using the technetium-99m ({sup 99m}Tc) tetrofosmin (SPECT) associated with nitrate administration in the detection of hypoperfused but still viable myocardium. The method allows the detection of this disease. [Italian] Il lavoro analizza i risultati degli esami condotti su 22 pazienti con cardiopatia ischemica cronica e ridotta funzione ventricolare sinistra sottoposti a tomografia computerizzata con emissione di fotone singolo (SPECT) cardiaca con tecnezio-99m ({sup 99m}Tc) tetrofosmina associata alla somministrazione di nitrati nella differenziazione tra tessuto miocardico ipoperfuso ma ancora vitale e tessuto miocardico necrotico. La metodologia usata consente di identificare la presenza di tessuto miocardico vitale in territori vascolari severamente ipoperfusi.

  6. QUALIDADE DE VIDA EM GESTANTES COM CARDIOPATIA

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    Silmara Meneguin

    2013-01-01

    Full Text Available Investigación descriptiva, exploratoria y transversal con objeto de describir la calidad de vida percibida en gestantes con cardiopatía. El Índice de Calidad de Vida de Ferrans y Powers fue aplicado en 42 pacientes, a partir del segundo trimestre de embarazo, entre enero del 2008 y marzo del 2009. Fueron usados la estadística descriptiva, análisis de variancia y test t de Student. La mediana del score total de calidad de vida fue relativamente alta (23,9 y el dominio socioeconómico el más comprometido (22,9. Fue observada tendencia entre embarazo no planeado y dominio socioeconómico (p=0,065. La calidad de vida de estos pacientes puede ser considerada buena pero, cuando el embarazo no fue planeado, contribuye para empeorar la dimensión socioeconómica. El embarazo de alto riesgo no influenció la calidad de vida, ya que la misma estuvo vinculada a significados de felicidad, satisfacción y realización personal. DESCRIPTORES: Calidad de vida. Gestación. CarInvestigación descriptiva, exploratoria y transversal con objeto de describir la calidad de vida percibida en gestantes con cardiopatía. El Índice de Calidad de Vida de Ferrans y Powers fue aplicado en 42 pacientes, a partir del segundo trimestre de embarazo, entre enero del 2008 y marzo del 2009. Fueron usados la estadística descriptiva, análisis de variancia y test t de Student. La mediana del score total de calidad de vida fue relativamente alta (23,9 y el dominio socioeconómico el más comprometido (22,9. Fue observada tendencia entre embarazo no planeado y dominio socioeconómico (p=0,065. La calidad de vida de estos pacientes puede ser considerada buena pero, cuando el embarazo no fue planeado, contribuye para empeorar la dimensión socioeconómica. El embarazo de alto riesgo no influenció la calidad de vida, ya que la misma estuvo vinculada a significados de felicidad, satisfacción y realización personal.

  7. Malformações detectadas pelo ultrassom abdominal em crianças com cardiopatia congênita Malformations detected by abdominal ultrasound in children with congenital heart disease

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    Rosana Cardoso Manique Rosa

    2012-01-01

    Full Text Available FUNDAMENTO: Malformações extracardíacas podem estar presentes em pacientes com cardiopatia congênita (CC, trazendo maior risco de comorbidade e mortalidade. OBJETIVO: Verificar a frequência e os tipos de anormalidades abdominais detectadas em crianças com e sem CC através do ultrassom abdominal (USA, comparar os pacientes quanto a seus achados dismórficos/citogenéticos e realizar uma estimativa do custo-benefício da triagem pelo USA. MÉTODOS: Foi realizado um estudo transversal com controle. Os casos consistiram de pacientes com CC admitidos pela primeira vez em uma unidade de terapia intensiva pediátrica; os controles consistiram de crianças sem CC submetidas ao USA no hospital logo após cada caso. Todos os pacientes com CC foram submetidos ao USA, ao cariótipo de alta resolução e à hibridização in situ fluorescente (FISH para microdeleção 22q11.2. RESULTADOS: USA identificou anormalidades clinicamente significativas em 12,2% dos casos e em 5,2% dos controles (p = 0,009, com um poder de significância de 76,6%. A maioria das malformações com significado clínico foi de anomalias renais (10,4% nos casos e 4,9% nos controles, p = 0,034. No Brasil, o custo de um exame de USA pelo Sistema Único de Saúde é de 21 dólares. Uma vez que anormalidades clinicamente significativas foram observadas em um a cada 8,2 pacientes com CC, o custo para identificar uma criança afetada foi de 176 dólares. CONCLUSÃO: Pacientes com CC apresentam uma frequência significativa de anomalias detectadas pelo USA, um método diagnóstico barato e não invasivo, com boa sensibilidade. O custo da triagem para esses defeitos é consideravelmente menor que o custo para tratar as complicações do diagnóstico tardio de malformações abdominais, como a doença renal.BACKGROUND: Extracardiac malformations may be present in patients with congenital heart disease (CHD, bringing greater risk of comorbidity and mortality. OBJECTIVE: Verify frequency

  8. Malformações detectadas pelo ultrassom abdominal em crianças com cardiopatia congênita Malformations detected by abdominal ultrasound in children with congenital heart disease

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    Rosana Cardoso Manique Rosa

    2012-12-01

    Full Text Available FUNDAMENTO: Malformações extracardíacas podem estar presentes em pacientes com cardiopatia congênita (CC, trazendo maior risco de comorbidade e mortalidade. OBJETIVO: Verificar a frequência e os tipos de anormalidades abdominais detectadas em crianças com e sem CC através do ultrassom abdominal (USA, comparar os pacientes quanto a seus achados dismórficos/citogenéticos e realizar uma estimativa do custo-benefício da triagem pelo USA. MÉTODOS: Foi realizado um estudo transversal com controle. Os casos consistiram de pacientes com CC admitidos pela primeira vez em uma unidade de terapia intensiva pediátrica; os controles consistiram de crianças sem CC submetidas ao USA no hospital logo após cada caso. Todos os pacientes com CC foram submetidos ao USA, ao cariótipo de alta resolução e à hibridização in situ fluorescente (FISH para microdeleção 22q11.2. RESULTADOS: USA identificou anormalidades clinicamente significativas em 12,2% dos casos e em 5,2% dos controles (p = 0,009, com um poder de significância de 76,6%. A maioria das malformações com significado clínico foi de anomalias renais (10,4% nos casos e 4,9% nos controles, p = 0,034. No Brasil, o custo de um exame de USA pelo Sistema Único de Saúde é de 21 dólares. Uma vez que anormalidades clinicamente significativas foram observadas em um a cada 8,2 pacientes com CC, o custo para identificar uma criança afetada foi de 176 dólares. CONCLUSÃO: Pacientes com CC apresentam uma frequência significativa de anomalias detectadas pelo USA, um método diagnóstico barato e não invasivo, com boa sensibilidade. O custo da triagem para esses defeitos é consideravelmente menor que o custo para tratar as complicações do diagnóstico tardio de malformações abdominais, como a doença renal.BACKGROUND: Extracardiac malformations may be present in patients with congenital heart disease (CHD, bringing greater risk of comorbidity and mortality. OBJECTIVE: Verify frequency

  9. O significado de ser mãe de um filho portador de cardiopatia: um estudo fenomenológico El significado de ser madre de un hijo portador de cardiopatía: un estudio fenomenológico The meaning of being a mother of a child with a heart disease: a phenomenological study

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    Ribeiro Carine

    2006-03-01

    Full Text Available Este estudo teve por objetivo compreender a vivência da mãe que possui um filho portador de cardiopatia congênita. Para tal, utilizei-me da abordagem fenomenológica. O estudo foi realizado com mães de crianças com cardiopatia congênita cianótica internadas no Centro de Cardiologia Infantil de um hospital público de Campo Grande - MS. Foram realizadas dez entrevistas abertas com a seguinte questão norteadora: O que é para você ter um filho com problema no coração?. A análise compreensiva das falas possibilitou a construção de três cate-gorias: "Descobrindo a doença: estar diante do desconhecido"; "Convivendo com a cardiopatia: ser com o filho na doença" e "Acreditando em uma força maior: a sustentação necessária". O impacto da doença para a mãe inicia-se com o nascimento do filho. Sentimentos, como desespero, culpa e insegurança, são descritos como presentes. É em Deus, porém, que ela busca a sustentação necessária para trilhar esse novo caminho. Caminho de dor e de fé.En este estudio se tuvo por objetivo comprender la vivencia de la madre que posee un hijo portador de cardiopatía congénita. Fue utilizado el abordaje fenomenológico y el estudio realizado con madres de niños con cardiopatía congénita cianótica internados en el Centro de Cardiología Infantil de un hospital público de Campo Grande - MS. Fueron realizadas diez entrevistas abiertas con la siguiente pregunta orientadora: ¿que es para ud. tener un hijo con problema en el corazón?. El análisis comprensivo de los discursos posibilitó la construcción de tres categorías: "Des-cubriendo la enfermedad: estar delante de lo desconocido"; "Conviviendo con la cardiopatía: ser con el hijo en la enfermedad" y "Creyendo en una fuerza mayor: el sustento necesario". El impacto de la enfermedad para la madre se inicia con el nacimiento del hijo. Sentimientos tales como desesperación, culpa e inseguridad, son descritos como presentes. Es en Dios, no

  10. Pode a correção cirúrgica de cardiopatias pediátricas e congênitas conviver com baixa mortalidade?: revisão de 10 anos de experiência com 1088 cirurgias Can surgical correction of congenital heart diseasse go along with low mortality?: 10 year experience in 1088 surgeries

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    Danton R. da Rocha Loures

    1987-04-01

    Full Text Available Em um período de 10 anos, de novembro de 1976 a novembro de 1986, foram realizadas 1088 cirurgias, em pacientes com cardiopatias pediátricas, com menos de 15 anos de idade, e em pacientes com cardiopatias congênitas. Foram corrigidos, com o auxílio da CEC, 670 casos e, com cirurgia clássica, 418 casos. Foram reoperados 111 pacientes (10,2%. Pacientes com lesões valvares adquiridas e com menos de 15 anos de Idade, analisados neste trabalho, compreenderam 120 casos (11,1%. A mortalidade hospitalar global foi de 10,4%, sendo 11,2% com auxílio de CEC e 9,1% sem CEC. Foi observada uma queda de mortalidade, nos anos de 1985 e 1986, correspondendo a 6,8% e 5,7%, respectivamente. Nesse período de 2 anos, foram realizadas 179 cirurgias, sendo corrigidas 54 cardiopatias congênitas cianóticas, com 7 óbitos (12,9%, e 125 acianóticas, com 2 óbitos (1,6%. A maior mortalidade ocorreu no primeiro ano de vida (20,7%, havendo uma diminuição do número de óbitos nas outras faixas etárias, especialmente acima do quarto ano de vida. A análise dos fatores que influíram na diminuição da mortalidade revelou: indicação mais freqüente de cirurgias pediátricas no primeiro ano de vida, análise cuidadosa da anatomia cirúrgica, definições precisas do momento da intervenção e técnicas de cirurgia, melhor proteção miocárdica, condições físicas e médicas no pós-operatório e maior experiência cirúrgica.From November 1976 to November 1986,1088 cardiac surgeries were performed in patients younger than fifteen years old. In 670 cases we used extracorporeal circulation, and in 418 we performed surgery without extracorporeal circulation. One hundred and eleven (10.2% patients were reoperated. One hundred and twenty (11.1% patients had acquired valvular heart disease. The total hospital mortality was 10.4%; 11.2% after extracorporeal circulation and 9.1% without it. We observed a decrease in the mortality rate in the years 1985 and 1986

  11. Aprotinina preserva plaquetas em crianças com cardiopatia congênita acianogênica operadas com circulação extracorpórea? Does aprotinin preserve platelets in children with acyanogenic congenital heart disease undergone surgery with cardiopulmonary bypass?

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    Cesar Augusto Ferreira

    2009-09-01

    Full Text Available OBJETIVO: Avaliação dos efeitos hemostáticos e plaquetários em crianças submetidas a correção de cardiopatias congênitas acianogênicas com circulação extracorpórea que receberam aprotinina. MÉTODOS: Estudo prospectivo randomizado em crianças de 30 dias a 4 anos de idade, submetidas a correção de cardiopatia congênita acianogênica, com circulação extracorpórea (CEC e divididas em dois grupos, um denominado Controle (n=9 e o outro, Aprotinina (n=10. Neste, a droga foi administrada antes e durante a CEC. A disfunção hemostática foi analisada por marcadores clínicos e bioquímicos. Foram consideradas significantes as diferenças com POBJECTIVE: Evaluation of the hemostatic and platelets effects in children with acyanogenic congenital heart disease undergone on-pump surgery who received aprotinin. METHODS: A prospective randomized study was performed on children aged 30 days to 4 years who had undergone correction of acyanogenic congenital heart disease using cardiopulmonary bypass (CPB and were divided into two groups: Control (n=9 and Aprotinin (n=10. In the Aprotinin Group the drug was administered before and during CPB and the hemostatic dysfunction was analyzed by clinical and biochemical markers. Differences were considered to be significant when P<0.05. RESULTS: The groups were similar regarding demographic and intraoperative variables, except for a greater hemodilution in the Aprotinin Group. The drug presented no benefit regarding time of mechanical pulmonary ventilation, stay in the postoperative intensive care unit and hospital, or regarding the use of inotropic drugs and renal function. Platelet concentration was preserved with the use of Aprotinin, whereas thrombocytopenia occurred in the Control Group since the initiation of CPB. Blood loss was similar for both groups. There were no complications with the use of Aprotinin. CONCLUSION: Aprotinin quantitatively preserved the blood platelets in children with

  12. Teste ergométrico e o Holter de 24 horas na detecção de arritmias ventriculares complexas em diferentes estádios da cardiopatia chagásica crônica Exercise testing and 24 hours Holter monitoring in the detection of complex ventricular arrhythmias in different stages of chronic Chagas' heart disease

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    Roberto Coury Pedrosa

    2004-10-01

    Full Text Available Comparou-se o teste ergométrico com Holter de 24 horas na detecção de arritmias ventriculares complexas em diferentes estádios da cardiopatia chagásica crônica. Avaliados 71 pacientes sem outras doenças associadas, idade=51±10,3, metade mulheres. Divididos em quatro grupos conforme o grau de acometimento cardíaco. A estatística esta discriminada no corpo do trabalho. Ao Holter, no grupo IA as arritmias ventriculares complexas foram detectadas em 4,3%, IB em 25%, II em 55% e no grupo III em 90%. Nos grupos II e III não houve diferença entre os exames na detecção de arritmias ventriculares complexas (p=NS. Nos grupos IA e IB, houve uma concordância de 100% no teste ergométrico na não detecção de arritmias ventriculares complexas entre dois observadores. No grupo II, a concordância foi de 70% (kappa=0,368, p=0,003 e de 90% (kappa=0,78, p=0,002 no grupo III. Foi observado diferenças na presença de arritmias ventriculares complexas entre os pacientes dos grupos em fase inicial e avançada da cardiopatia chagásica crônica. Nos pacientes dos grupos II e III não houve diferença entre os dois exames na detecção das arritmias ventriculares complexas. Pacientes dos grupos IA e IB é razoável indicar Holter e/ou o teste ergométrico na ocorrência de progressão da doença.To detect complex ventricular arrhythmias in different stages of chronic chagasic cardiopathy, the results of exercise testing to 24 hours Holter monitoring have been compared. We evaluated a group of 71 patients, half women, aged 51±10.3, with no others associated diseases. These patients were separated in 4 groups according to degree of cardiac involvement. Statistical data can be found elsewhere in the study. In group IA, Holter monitoring detected 4.3% of complex ventricular arrhythmias, group IB 25%, group II 55% and group III 90%. We found no difference between Holter and exercise testing in the detection of complex ventricular arrhythmias in groups II

  13. O papel do ecocardiograma como método isolado na indicação cirúrgica de pacientes portadores de cardiopatia congênita The role of echocardiography as an isolated method for indicating surgery in patients with congenital heart disease

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    Lilian Maria Lopes

    2005-05-01

    Full Text Available OBJETIVO: Determinar a acurácia diagnóstica do ecocardiograma, analisando prospectivamente, o valor do método na indicação cirúrgica sem cateterismo em portadores de cardiopatia congênita, através da comparação do diagnóstico ecocardiográfico com os achados intra-operatórios e/ou do estudo invasivo. MÉTODOS: De fevereiro/2000 a janeiro/2001, foram acompanhados 493 pacientes cardiopatas congênitos com indicação cirúrgica, submetidos a ecocardiograma com mapeamento de fluxo em cores para decisão terapêutica. Os resultados foram comparados aos achados cirúrgicos e/ou de cateterismo quando realizado para complementação diagnóstica. RESULTADOS: Dos pacientes estudados, 94,3% (465 casos foram submetidos à correção da cardiopatia congênita apenas com o ecocardiograma e sem cateterismo diagnóstico. O estudo invasivo foi realizado para complementação diagnóstica em 28 (5,6% casos, o tratamento cirúrgico realizado em mais de 95% dos casos e o cateterismo terapêutico em 3,6%. Os achados do ecocardiograma se confirmaram em 464 (94,1% dos casos, demonstrando uma alta acurácia do método. Ocorreram 8 (1,6% casos de falso positivos e 39 (7,9% casos de falso negativos. Segundo os cirurgiões, nenhum dos erros diagnósticos levaram a complicações ou afetaram os resultados cirúrgicos adversamente. CONCLUSÃO: O ecocardiograma se mostrou método sensível e seguro para indicação cirúrgica, dispensando, muitas vezes, a realização de estudo invasivo, ficando este, restrito aos casos de complementação diagnóstica ou terapêutica.OBJECTIVE: To determine the diagnostic accuracy of echocardiography for indicating surgery without catheterization in patients with congenital heart disease through a prospective analysis and comparison of the echocardiographic diagnosis with the intraoperative findings, or invasive study, or both. METHODS: From February 2000 to January 2001, 493 patients with congenital heart diseases indicated

  14. The epidemiologic profile and prevalence of cardiopathy in Trypanosoma cruzi infected blood donor candidates, Londrina, Paraná, Brazil Perfil epidemiológico e prevalência de cardiopatia em candidatos a doador de sangue infectados por Trypanosoma cruzi, Londrina, Paraná, Brasil

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    Divina Seila de Oliveira-Marques

    2005-12-01

    Full Text Available To describe the epidemiologic profile and prevalence of cardiopathy in 163 Trypanosoma cruzi serum positive blood donor candidates, a descriptive study was carried out between August, 1996 and November, 1997 at the Londrina State University Chagas Disease Outpatient Clinic. The profile found was: young, average age 42.95 ± 8.62 years; male (65%; Caucasian (84%; low level of schooling; low family income; agricultural worker (26%; born in the state of Paraná (67%; from rural areas (85%; migrated to the city (85%; and the vector as the main mechanism of transmission. During the clinical characterization a chronic cardiac form was found in 38% of the patients and classified as cardiac suggestive form in 21% and little suggestive of Chagas disease in 17%. No significant difference was found among age group distribution, sex and the presence of cardiac symptoms in patients with or without cardiopathy. This study emphasizes the importance of expanding medical services to areas with a greater prevalence of infected individuals, in a hierarchical manner and aiming at decentralization.Objetivando-se traçar o perfil epidemiológico e a prevalência de cardiopatia, realizou-se estudo descritivo em 163 candidatos a doador de sangue infectados por Trypanosoma cruzi, atendidos no período de agosto de 1996 a novembro de 1997 no ambulatório de doença de Chagas do Hospital de Clínicas da Universidade Estadual de Londrina. O perfil epidemiológico foi de paciente jovem, média de idade de 42,95 ± 8,62 anos, sexo masculino (65%, raça branca (84%, baixa escolaridade, baixa renda familiar, agricultor (26%, natural do estado do Paraná (67%, de zona rural (85%, residindo atualmente em zona urbana (85%, sendo o vetorial o principal mecanismo de transmissão. A forma crônica cardíaca, encontrada em 38% foi classificada em forma cardíaca sugestiva de doença de Chagas em 21% e pouco sugestiva em 17% dos pacientes. Não houve diferença significativa na

  15. Funções autonômica cardíaca e mecânica ventricular na cardiopatia chagásica crônica assintomática Cardiac autonomic and ventricular mechanical functions in asymptomatic chronic chagasic cardiomyopathy

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    Daniel França Vasconcelos

    2012-02-01

    Full Text Available FUNDAMENTO: A associação das funções autonômica cardíaca e ventricular sisto-diastólica variavelmente alteradas ainda é controversa e pouco explorada na cardiopatia chagásica crônica. OBJETIVO: Avaliar em que extensão as funções autonômica cardíaca e mecânica ventricular estão alteradas e se ambas estão relacionadas na cardiopatia chagásica assintomática. MÉTODOS: EM 13 cardiopatas chagásicos assintomáticos e 15 indivíduos normais (grupo controle, foram avaliadas e correlacionadas a modulação autonômica da variabilidade da frequência cardíaca durante cinco minutos, nos domínios temporal e espectral, nas posições supina e ortostática, e a função ventricular com base em variáveis morfofuncionais Doppler ecocardiográficas. A análise estatística empregou o teste de Mann-Whitney e a correlação de Spearman. RESULTADOS: Em ambas as posições, os índices temporais (p = 0,0004-0,01 e as áreas espectrais total (p = 0,0007-0,005 e absoluta, de baixa e alta frequências (p = 0,0001-0,002, mostraram-se menores no grupo chagásico. O balanço vagossimpático mostrou-se semelhante em ambas as posturas (p = 0,43-0,89. As variáveis ecocardiográficas não diferiram entre os grupos (p = 0,13-0,82, exceto o diâmetro sistólico final do ventrículo esquerdo que se mostrou maior (p = 0,04, correlacionando-se diretamente com os reduzidos índices da modulação autonômica global (p = 0,01-0,04 e parassimpática (p = 0,002-0,01, nos pacientes chagásicos, em posição ortostática. CONCLUSÃO: AS DEpressões simpática e parassimpática com balanço preservado associaram-se apenas a um indicador de disfunção ventricular. Isso sugere que a disfunção autonômica cardíaca pode preceder e ser independentemente mais severa que a disfunção ventricular, não havendo associação causal entre ambos os distúrbios na cardiopatia chagásica crônica.BACKGROUND: The association of variably altered cardiac autonomic and

  16. Mapeamento epicárdico da taquicardia ventricular sustentada em cardiopatias não isquêmicas Mapeo epicárdico de la taquicardia ventricular sostenida en cardiopatías no isquémicas Epicardial mapping of sustained ventricular tachycardia in nonischemic heart disease

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    Geórgia Guedes da Silva

    2011-02-01

    Full Text Available FUNDAMENTO: A complexidade dos circuitos reentrantes relacionados às taquicardias ventriculares diminui os índices de sucesso dos procedimentos de ablação por radiofrequência. OBJETIVO: Avaliar se o mapeamento epicárdico com múltiplos eletrodos realizado simultaneamente com o mapeamento endocárdico auxilia na ablação da taquicardia ventricular (TV sustentada em pacientes com cardiopatia não isquêmica. MÉTODOS: Vinte e seis pacientes com TV sustentada recorrente, sendo 22 (84,6% com cardiopatia chagásica crônica, dois (7,7% com cardiomiopatia dilatada idiopática e dois (7,7% portadores de displasia arritmogênica do ventrículo direito, foram submetidos a mapeamento epicárdico com dois ou três microcateteres, com 8 eletrodos cada, simultaneamente ao mapeamento endocárdico convencional. Utilizou-se cateter com ponta de 4 mm para ablação com radiofrequência (RF realizada durante a TV induzida. RESULTADOS: Das 33 TVs induzidas, 25 foram mapeadas e 20 tiveram sua origem definida. Onze com origem epicárdica e 9 endocárdica. A estimulação ventricular programada não induziu TV sustentada em 11 (42,0% dos 26 pacientes após a ablação. Eventos como recorrência da TV e morte ocorreram em 10,0% dos pacientes submetidos à ablação com sucesso, e em 59,0% dos insucessos, em seguimento ambulatorial médio de 357 ± 208 dias. CONCLUSÃO: Circuitos subepicárdicos são frequentes em pacientes com cardiopatia não isquêmica. O mapeamento epicárdico com múltiplos cateteres realizado simultaneamente com o mapeamento endocárdico contribui para a identificação destes circuitos em um mesmo procedimento.FUNDAMENTO: La complejidad de los circuitos reentrantes relacionados a las taquicardias ventriculares disminuye los índices de éxito de los procedimientos de ablación por radiofrecuencia. OBJETIVO: Evaluar si el mapeo epicárdico con múltiples electrodos realizado simultáneamente con el mapeo endocárdico ayuda en la ablaci

  17. Diagnostic methods in ischemic necrosis of the femoral head. Metodos de diagnostico en la necrosis isquemica de la cabeza femoral

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    Parra Blanco, J.A.; Pagola Serrano, M.A.; Delgado Macias, M.T. (Hospital Universitario Marques de Valdecilla, Santander (Spain))

    1994-01-01

    Ischemic necrosis of the femoral head (INFH) must be diagnosed at an early stage of development, when therapeutic approaches such as forage biopsy or osteotomy can prevent or slow the normal progression of the disease to arthrosis. In this article, on the basis of the pathological changes that characterize process, we review the advantages and limitations of the principal diagnostic techniques (table I) currently employed in the study of INFH. (Author)

  18. Síndrome brânquio-óculo-facial (BOFS e cardiopatias congênitas Síndrome branquio óculo facial (BOFS y cardiopatías congénitas Branchio-oculo-facial syndrome (BOFS and congenital heart defects

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    Rafael Fabiano Machado Rosa

    2009-02-01

    Full Text Available Relatamos aqui o caso de um menino com 43 dias de vida, apresentando síndrome brânquio-óculo-facial (BOFS e cardiopatia congênita. Na avaliação clínica, ele possuía retardo de crescimento, pregas epicânticas, fendas palpebrais pequenas, telecanto, base nasal alargada, fenda labial falsa (pseudocleft, micrognatia, orelhas displásicas e rotadas posteriormente, fendas branquiais, pescoço curto e alado, mamilo extranumerário, hipotonia e reflexos tendinosos profundos diminuídos. A ecocardiografia verificou presença de um defeito do septo atrioventricular completo do tipo A e persistência do canal arterial. Essa descrição fortalece a possibilidade de que defeitos cardíacos congênitos possam fazer parte do espectro de anormalidades observado na BOFS.Relatamos en este estudio el caso de un niño con 43 días de vida, que presentaba síndrome branquio óculo facial (BOFS y cardiopatía congénita. En la evaluación clínica, revelaba retardo de crecimiento, pliegues epicánticos, hendiduras palpebrales pequeñas, telecanto, base nasal ensanchada, hendidura labial falsa (pseudocleft, micrognatia, orejas displásicas y rotadas posteriormente, hendiduras branquiales, cuello corto y alado, pezón extranumerario, hipotonía y reflejos tendinosos profundos diminuidos. La ecocardiografía verificó la presencia de un defecto del septo atrioventricular completo del tipo A y conducto arterial persistente. Dicha descripción fortalece la posibilidad de que defectos cardiacos congénitos puedan forman parte del espectro de anormalidades observado en la BOFS.We report the case of a 43-day-old boy with branchio-oculo-facial syndrome (BOFS and congenital heart defect. On clinical examination, he presented growth retardation, epicanthal folds, small palpebral fissures, telecanthus, broadened nasal bridge, lip pseudocleft, micrognathia, dysplastic and posteriorly-rotated ears, branchial clefts, short and webbed neck, supernumerary nipple, hypotonia

  19. Cardiopatia chagásica crônica causando insuficiência cardíaca congestiva na infância: estudo clínico e histopatológico de um caso, com ênfase para as lesões dos sistemas excito-condutor e nervoso autônomo intracardíaco

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    Ademir Rocha

    1993-12-01

    Full Text Available Descreve-se caso de cardiopatia chagásica em menino de nove anos, natural e procedente do sulde Goiás, que desenvolveu insuficiência cardíaca congestiva quatro meses antes do óbito. As reações sorológicaspara doença de Chagas eram reagentes, epositivo o xenodiagnóstico. Os eletrocardiogramas mostraram taquicardia sinusal, extra-sístoles ventriculares e supraventriculares, hemibloqueio anterior esquerdo, bloqueio completo do ramo direito e sinais de sobrecarga de câmaras. O exame ecocardiográfico evidenciou dilatação de câmaras com hipocontratilidade difusa. O quadro se agravou progressivamente, complicando-se por vários episódios pneumônicos, o último dos quais provocou o óbito. A necrópsia, verificou-se, no coração, inflama ção crônica dos três folhetos, com miocardite crônica fibrosante predominando no septo interventricular e no ventrículo esquerdo. As estruturas componentes do sistema excito-condutor mostraram processoflogístico crônico, essencialmente exsudativo, ora discreto, ora moderado. No sistema nervoso autônomo intracardíaco constataram-se focos esparsos de discreta periganglionite crônica, e raros fenômenos degenerativos dos neurônios sem despopulação neuronal.A case of decompensated chagasic cardiopathy in a nine-year-old boy from the south of the State of Goiás, is described. He developed congestive heart failure four months before death. The sorological reaction for Chagas ' disease and the xenodiagnosis were positive. Electrocardiograms showed sinusal tachycardia, ventricular and supraventricular extrasystoles, left anterior hemiblock, complete right bundle branch block and signs of chambers overload. The echocardiogram demonstraded chamber dilatation with diffuse hypocontractility. He presented a downhill course complicated with several pneumonic episodes, the last one just before death. At necropsy, the heart, exhibited a chronicpancarditis with fibrosing chronic myocarditis involving

  20. Associação de HLA-DR2 com cardiopatia crônica em uma população da região noroeste do Estado do Paraná, Brasil Association of HLA-DR2 with chronic chagasic cardiopathy in a population at Paraná Northeast region, Brazil

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    Ricardo Alberto Moliterno

    2002-04-01

    Full Text Available A doença de Chagas é um dos maiores problemas que afetam a saúde pública no Brasil e outros países latino americanos. No entanto, poucos trabalhos avaliaram a susceptibilidade genética a esta doença. Como genes de resposta imune estão localizados no Complexo de Histocompatibilidade HLA, decidimos estudar a associação entre os antígenos HLA e a forma cardíaca da doença de Chagas, que parece apresentar um componente auto-imune importante. Trinta e cinco pacientes e 72 controles residentes na região noroeste do estado do Paraná foram utilizados neste estudo. Métodos estatísticos clássicos foram usados para comparar as freqüências HLA entre pacientes e controles. Os dados confirmam uma associação primária com HLA-DR2 (48.4%vs12.3%; Pc=0,0011 e secundária com HLA-B7 (31.4%vs8.3%; Pc=0.033. Concluindo, uma associação positiva entre DR2 e cardiopatia chagásica crônica foi demonstrada numa população de brancos brasileiros, reforçando a hipótese do envolvimento de fatores genéticos na susceptibilidade à forma cardíaca da doença de ChagasChagas’ disease is one of the major problems concerning public health in Brazil and other Latin American countries. Nevertheless, few studies have addressed the genetic susceptibility to this disease. As immune response genes are located into the HLA system, there was a good reason to study the association between HLA antigens and the cardiac form of Chagas’ disease. Thirty-five patients and seventy-two normal individuals, living in the State of Paraná northern region, Brazil, were used as test and control groups, respectively. Classical statistical methods were used to compare HLA frequencies between these groups. Data confirmed a positive primary association with HLA-DR2 (48.4%vs12.3%; Pc=0,0011 and a secondary association with HLA-B7 (31.4%vs8.3%; Pc=0.033. In conclusion, a positive association between DR2 and chronic chagasic cardiopathy was demonstrated in the caucasian

  1. Monitorização materno-fetal durante procedimento odontológico em portadora de cardiopatia valvar Monitoreo maternofetal durante procedimiento odontológico en portadora de cardiopatía valvular Maternal-fetal monitoring during dental procedure in patients with heart valve disease

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    Itamara Lucia Itagiba Neves

    2009-11-01

    Full Text Available FUNDAMENTO: Os efeitos da anestesia local em odontologia com lidocaína e epinefrina, sobre parâmetros cardiovasculares de gestantes portadoras de valvopatias e seus conceptos, não estão esclarecidos. OBJETIVO: Avaliar e analisar parâmetros da cardiotocografia, de pressão arterial e eletrocardiográficos da gestante portadora de doença valvar reumática, quando submetida à anestesia local com 1,8 ml de lidocaína 2% sem vasoconstritor e com epinefrina 1:100.000, durante procedimento odontológico restaurador. MÉTODOS: Realizamos monitorização ambulatorial da pressão arterial, eletrocardiografia ambulatorial materna e cardiotocografia de 31 portadoras de cardiopatia reumática, entre a 28ª e 37ª semana de gestação, divididas em dois grupos conforme presença ou não do vasoconstritor RESULTADOS: Demonstrou-se redução significativa dos valores de frequência cardíaca materna nos dois grupos, durante o procedimento, quando comparado aos demais períodos (p 0,05. O mesmo ocorreu (p > 0,05 com número de contrações uterinas, nível e variabilidade da linha de base e número de acelerações da frequência cardíaca fetal. CONCLUSÃO: O uso de 1,8 ml de lidocaína 2% associado à adrenalina mostrou-se seguro e eficaz em procedimento odontológico restaurador durante a gestação de mulheres com cardiopatia valvar reumática.FUNDAMENTO: Los efectos de la anestesia local en odontología con lidocaína y epinefrina, sobre los parámetros cardiovasculares de gestantes portadoras de valvulopatías y sus conceptos, no son claros. OBJETIVO: Evaluar y analizar parámetros de la cardiotocografía, de la presión arterial y electrocardiográficos de la gestante portadora de enfermedad valvular reumática, al someterse a anestesia local con 1,8 ml de lidocaína 2% sin vasoconstrictor y con epinefrina 1:100.000, durante procedimiento odontológico restaurador. MÉTODOS: Realizamos monitoreo ambulatorio de la presión arterial

  2. Carvedilol atenua o estresse oxidativo na cardiopatia chagásica crônica Carvedilol atenúa el estrés oxidativo en la cardiopatía chagásica crónica Carvedilol attenuates oxidative stress in chronic chagasic cardiomyopathy

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    Patrícia Budni

    2012-03-01

    Full Text Available FUNDAMENTO: Há cada vez mais evidências sugerindo que doença de Chagas envolve dano oxidativo e contribui para a progressão da doença cardíaca. OBJETIVO: Avaliar o efeito do carvedilol sobre marcadores de estresse oxidativo na doença de Chagas crônica. MÉTODOS: A população de estudo incluiu 42 pacientes com cardiopatia chagásica e os biomarcadores de estresse oxidativo foram medidos antes e após um período de seis meses de tratamento com carvedilol (37,5 mg/dia. Os pacientes foram considerados de acordo com a classificação de Los Andes, e a atividade da superóxido dismutase, catalase, glutationa peroxidase, S-transferase e redutase, mieloperoxidase e adenosina deaminase; e os níveis de glutationa reduzida, de espécies reativas do ácido tiobarbitúrico, proteína carbonil, vitamina E e óxido nítrico foram medidos no sangue. RESULTADOS: Após o tratamento com carvedilol, todos os grupos apresentaram reduções significativas nos níveis de proteína carbonil e glutationa reduzida, enquanto os níveis de óxido nítrico e atividade da adenosina aumentaram significativamente somente no grupo IA. Além disso, a maioria das enzimas antioxidantes apresentou diminuição de suas atividades, nos grupos IA e IB. CONCLUSÃO: Os dados sugerem que o tratamento com carvedilol foi eficaz na atenuação do dano oxidativo, um efeito que pode ser particularmente importante em doença de Chagas crônica com cardiopatia.FUNDAMENTO: Hay cada vez más evidencias sugiriendo que la enfermedad de Chagas envuelve daño oxidativo y contribuye a la progresión de la enfermedad cardíaca. OBJETIVO: Evaluar el efecto del carvedilol sobre marcadores de estrés oxidativo en la enfermedad de Chagas crónica. MÉTODOS: La población de estudio incluyó 42 pacientes con cardiopatía chagásica y los biomarcadores de estrés oxidativo fueron medidos antes y después de un período de seis meses de tratamiento con carvedilol (37,5 mg/día. Los pacientes fueron

  3. Síncope em pacientes com extra-sístoles de via de saída de ventrículo direito e sem cardiopatia estrutural aparente Syncope in patients with right ventricle outflow tract premature beats and no apparent structural cardiopathy

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    Ana Cristina Ludovice

    2006-11-01

    Full Text Available OBJETIVO: Estudar a prevalência de síncope neurocardiogênica em pacientes com síncope inexplicada e extra-sístoles ventriculares (EV, com morfologia de via de saída de ventrículo direito (VSVD sem cardiopatia estrutural aparente. MÉTODOS: Noventa pacientes (66 mulheres, idade média de 40,2 ± 16,95 anos com EV monomórficas com origem na VSVD foram avaliados prospectivamente. Cinqüenta e quatro pacientes apresentavam síncopes ou pré-síncopes associadas ou não a palpitações; 27 apresentavam palpitações sem pré-síncope ou síncope, e 9 eram assintomáticos. Todos foram submetidos a ecocardiograma, ECG de alta resolução, ressonância magnética cardíaca e teste de esforço para afastar cardiopatia estrutural e taquicardia ventricular adrenérgico-dependente, e a monitorização com Holter e monitor de eventos sintomáticos para correlacionar os sintomas com a arritmia. A investigação de suscetibilidade a síncope neurocardiogênica foi avaliada pelo teste de inclinação (TI. Os grupos foram comparados quanto a sexo, idade, freqüência e complexidade das extra-sístoles, com e sem esforço físico, resultado do TI e evolução clínica. RESULTADOS: No grupo com síncope e pré-síncope, o TI foi positivo em 38% dos casos e nos grupos com palpitações e assintomáticos, em 11% (p = 0,0257. Após orientação e tratamento da síncope neurocardiogênica, 85% dos pacientes com síncope e pré-sincope e TI positivo permaneceram assintomáticos durante seguimento médio de 40 meses. Dois pacientes com síncope e TI negativos apresentaram taquicardia ventricular sustentada espontânea durante a evolução clínica. CONCLUSÃO: A prevalência de síncope neurocardiogênica em pacientes com EV idiopáticas de VSVD é alta. Pacientes com síncope recorrente inexplicada e EV idiopáticas devem ser mantidos sob investigação.OBJECTIVE: Study the prevalence of neurocardiogenic etiology in patients with unexplained syncope and

  4. Determining the optimal dose of Fenton reagent in a leachate treatment by Fenton-adsorption; Determinacion de la dosis optima de reactivo Fenton en un tratamiento de lixiviados por Fenton-adsorcion

    Energy Technology Data Exchange (ETDEWEB)

    Mendez Novelo, Roger Ivan; Pietrogiovanna Bronca, Jose Alfredo; Santos Ocampo, Beatriz; Sauri Riancho, Maria Rosa; Giacoman Vallejos, German; Castillo Borges, Elba Rene [Universidad Autonoma de Yucatan, Facultad de Ingenieria, Merida, Yucatan (Mexico)]. E-mail: mnovelo@uady.mx

    2010-07-01

    tipo Fenton-adsorcion con el que se obtuvieron mejores resultados que con otros tratamientos fisicoquimicos o biologicos reportados en la literatura. El proceso Fenton consiste en tratar la carga contaminante con una combinacion de H{sub 2}O{sub 2} y FeSO4 en condiciones acidas. Se evaluo si la filtracion de los lodos producidos durante el proceso Fenton es un proceso mas eficiente que la sedimentacion. Se determino el tiempo de contacto optimo de la oxidacion Fenton, asi como la dosis optima de los reactivos usados en funcion de la DQO del lixiviado, mediante la determinacion de las mejores relaciones [Fe{sup 2+}]/[H{sub 2}O{sub 2}] y [DQO]/[H{sub 2}O{sub 2}]. Despues de optimizar el proceso, se filtraron las muestras oxidadas y se ensayo la adsorcion mediante columnas empacadas con carbon activado granular. Se concluyo que el lodo generado por el proceso Fenton se remueve mas eficientemente mediante filtracion que por sedimentacion. Los tiempos de contacto optimos fueron de 5 min para la remocion de la DQO y una hora para la remocion de color, tiempo elegido para proteger el carbon activado. Las mejores relaciones para [Fe{sup 2+}]/[H{sub 2}O{sub 2}] y [DQO]/[H{sub 2}O{sub 2}] fueron 0.6 y 9, respectivamente. La eficiencia maxima de remocion despues del proceso de adsorcion fue de 98.9 % para la DQO y 100 % para el color. El indice de biodegradabilidad final alcanzado despues de las pruebas de Fenton-adsorcion fue de 0.24.

  5. Evolution of nursing diagnoses for children with congenital heart disease Evolución de los diagnósticos enfermeros de niños con cardiopatías congénitas Evolução dos diagnósticos de enfermagem de crianças com cardiopatias congênitas

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    Viviane Martins da Silva

    2006-08-01

    diagnósticos de enfermagem em crianças portadoras de cardiopatias congênitas. Estudo longitudinal desenvolvido nos meses de julho a novembro de 2004. A amostra foi composta por 45 crianças internadas em um hospital da rede pública do município de Fortaleza, acompanhadas durante quinze dias de internamento. No período efetivaram-se seis avaliações diagnósticas. Foram encontrados 21 diagnósticos de enfermagem. Entre os diagnósticos, seis evidenciaram maiores oscilações em suas trajetórias de ocorrência no tempo: Padrão respiratório ineficaz, Intolerância à atividade, Desobstrução ineficaz das vias aéreas, Hipertermia, Padrão de sono perturbado e Risco para intolerância à atividade. Foram construídos cinco modelos paramétricos no domínio do tempo, com vistas a predizer a ocorrência desses diagnósticos de enfermagem. Conclui-se que o conhecimento da evolução temporal das respostas do indivíduo pode direcionar os cuidados de enfermagem para as reais necessidades do cliente.

  6. Alterações da função pulmonar após tratamento cirúrgico de cardiopatias congênitas com hiperfluxo pulmonar Changes in pulmonary function after surgical treatment of congenital heart disease with pulmonary hyperflow

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    Lilian Goraieb

    2008-08-01

    Full Text Available FUNDAMENTO: Análise das condições pulmonares dos pacientes no pós-operatório de cirurgia cardíaca pediátrica. OBJETIVO: Avaliar o comportamento da complacência pulmonar e resistência da via aérea nos pacientes portadores de cardiopatias congênitas com hiperfluxo pulmonar, submetidos a tratamento cirúrgico com auxílio de circulação extracorpórea. MÉTODOS: Avaliaram-se, durante a cirurgia, 35 pacientes com medidas de complacência estática e resistência da via aérea, em quatro instantes distintos. As medidas pulmonares foram feitas de forma não-invasiva, com o método de oclusão da via aérea ao final da inspiração e uso de fórmulas matemáticas específicas. As variáveis observadas e relacionadas às alterações pulmonares foram: no período pré-operatório, idade, peso e relação entre fluxo sangüíneo sistêmico e pulmonar; no intra-operatório, tempos de perfusão, de anóxia e temperatura mínima; no pós-operatório, tempo de ventilação mecânica e de permanência na unidade de terapia intensiva. RESULTADOS: Ao final da cirurgia, a complacência pulmonar mostrou aumento significativo imediato (p BACKGROUND: Analysis of pulmonary status of pediatric patients in the postoperative phase of cardiac surgery. OBJECTIVE: To assess pulmonary compliance and airway resistance in patients with congenital heart disease and pulmonary hyperflow submitted to surgical treatment with the use of extracorporeal circulation. METHODS: Thirty-five patients were evaluated during surgery with measurements of static compliance and airway resistance at four different timepoints. Pulmonary measurements were performed non-invasively using end-inspiratory airway occlusion and specific mathematical formulas. The variables examined and related to pulmonary changes were: preoperative - age, weight, and relationship between systemic and pulmonary blood flow; intraoperative - perfusion times, anoxia times and minimum temperature; postoperative

  7. Aumento do índice de massa corporal em relação a variáveis clínicas e laboratoriais quanto ao sexo em indivíduos sem evidências de cardiopatia Gender-related associations of increased body mass index with clinical and laboratory variables in individuals with no evidence of heart disease

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    Fernando Araújo

    2007-06-01

    Full Text Available FUNDAMENTO: Na prática clínica, atendemos pacientes com diversos índices de massa corporal (IMC, desde pacientes com sobrepeso até pacientes obesos. Esse achado pode ser a única anormalidade clínica aparente. OBJETIVO: Avaliar as variáveis clínicas e laboratoriais associadas com aumento do IMC em mulheres e homens assintomáticos, sem qualquer indício de cardiopatia, a fim de obter dados para substanciar recomendações médicas, em uma amostra de estudo da nossa prática diária. MÉTODOS: Foram estudados indivíduos entre 14 e 74 anos de idade (média de 40,5 anos; 295 eram homens (43,1% e 389 eram mulheres (56,9%. As relações entre IMC estratificado por sexo e as variáveis clínicas e laboratoriais foram analisadas por meio do coeficiente de correlação de Spearman e regressão linear múltipla. RESULTADOS: A média do IMC das mulheres (26,15 kg/m² e dos homens (26,33 kg/m² não apresentou diferença estatisticamente significante. No modelo de regressão linear múltipla, a relação colesterol total/fração HDL-colesterol (CT/HDL-C (beta= 1,1320; p BACKGROUND: In clinical practice, the patients we care for display a wide range of body mass indices, from lean to obese. This finding may be the sole apparent clinical abnormality. OBJECTIVE: To evaluate clinical and laboratory variables that might be associated with increased body mass index in asymptomatic men and women with no evidence of heart disease, to provide data to substantiate medical recommendations in a study sample from our everyday practice. METHODS: The subjects aged 14 to 74 years (mean 40.6 years, 295 men (43.1% and 389 women (56.9% The associations between body mass index stratified by gender and clinical and laboratory variables were analyzed using the Spearman correlation coefficient and multiple linear regression. RESULTS: The mean body mass index (BMI did not differ significantly between women (26.15 Kg/m² and men (26.33 Kg/m². In the multiple linear

  8. Análise inicial do uso de enxerto tubular orgânico L-D-Hydro - (Eato L-D-Hydro para realização de Blalock-Taussig modificado nas cardiopatias congênitas com hipofluxo pulmonar Initial analysis of the use of the L-D-Hydro (Eato L-D-Hydro organic tubular graft for performing the modified Blalock-Taussig procedure in congenital heart diseases with decreased pulmonary blood flow

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    Wilson Luiz da Silveira

    2005-03-01

    Full Text Available OBJETIVO: Analisar os resultados iniciais da utilização do enxerto tubular orgânico, utilizados para anastomoses sistêmico-pulmonares. MÉTODOS: De março/2002 a abril/2003, 10 pacientes foram submetidos à realização de shunt sistêmico pulmonar tipo Blalock-Taussig modificado utilizando um novo tipo de enxerto biológico originado da artéria mesentérica bovina tratada com poliglicol denominado L-D-Hydro. A idade variou de 3 dias a 7 anos e 60% dos pacientes eram do sexo masculino. O diagnóstico das cardiopatias foi determinado pela ecocardiografia, todos apresentando sinais clínicos de hipóxia severa (cianose. As cardiopatias foram: tetralogia de Fallot (40%, atresia tricúspide (50%, defeito do septo atrioventricular (10%. RESULTADOS: Em 10 pacientes, ocorreu um óbito por sepse e em nove houve melhora imediata na saturação de O2 ao oxímetro de pulso e da pressão parcial de oxigênio à gasometria arterial. Nenhum paciente apresentou obstrução do shunt no pós-operatório imediato ou qualquer outra complicação. Todos os pacientes mostraram shunt pérvio ao exame ecocardiográfico no pós-operatório imediato e tardio, realizado no 3º mês de pós-operatório. Nenhum paciente apresentou sangramento no intra e pós-operatório. CONCLUSÃO: O enxerto tubular L-D-HYDRO demonstrou ser promissor para a realização de shunt sistêmico pulmonar, como alternativa para produtos inorgânicos existentes no mercado, entretanto, temos de ter maior número de implantes e acompanhamento tardio para uma avaliação definitiva.OBJECTIVE: To analyze the initial results of the use of an organic tubular graft for systemic-pulmonary anastomoses. METHODS: From March 2002 to April 2003, 10 patients underwent systemic-pulmonary shunt of the modified Blalock-Taussig type, using a new type of biological graft originating from the bovine mesenteric artery treated with polyglycol, the so-called L-D-Hydro. The patients' ages ranged from 3 days to 7

  9. Efeitos da mudança de modo de estimulação ventricular para atrioventricular sobre a qualidade de vida em pacientes com cardiopatia chagásica e bloqueio atrioventricular na troca eletiva do gerador de pulsos Health-related quality of life in patients with Chagas' cardiomiopathy and complete atrioventricular block at elective pulse generator replacement: effects of pacing mode upgraded from VVI to DDD

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    Luiz Antonio Castilho Teno

    2005-03-01

    Full Text Available OBJETIVO: Avaliar os efeitos da mudança de modo de estimulação ventricular para atrioventricular sobre a qualidade de vida em pacientes com cardiopatia chagásica e bloqueio atrioventricular, na troca eletiva do gerador de pulsos. MÉTODO: No período de 8 de setembro de 2001 a 18 de março de 2004, no Instituto do Coração da Faculdade de Medicina da Universidade de São Paulo e no Hospital de Beneficência Portuguesa de Ribeirão Preto, foram estudados comparativamente sob estimulação ventricular e atrioventricular 27 pacientes com cardiopatia chagásica e bloqueio atrioventricular, com indicação de troca eletiva do gerador de pulsos. Os pacientes foram analisados na inclusão do estudo e alternadamente no modo ventricular e atrioventricular em duas fases com duração de 90 dias, considerando-se o comportamento clínico, avaliado pela qualidade de vida. A análise estatística foi realizada na condição basal, modo VVI e modo DDD, utilizando-se o teste de variância para medidas repetidas, considerando-se nível de significância de 0,05. RESULTADOS: Não foram detectadas diferenças de comportamento na qualidade de vida, avaliada pela capacidade funcional pelo estado geral e pela vitalidade, entre os dois modos de estimulação cardíaca estudados. Ocorreram três casos de complicações relacionadas à mudança de modo de estimulação: dois casos de taquiarritmias atriais conduzidas pelo marcapasso e um caso de deslocamento de eletrodo atrial. CONCLUSÕES: A análise comparativa da estimulação ventricular com a atrioventricular, na troca eletiva do gerador, demonstrou que não houve diferença de comportamento clínico sobre a qualidade de vida.OBJECTIVE: Health-related quality of life in patients with Chagas' cardiomyopathy and complete atrioventricular block at elective pulse generator replacement: effects of pacing mode upgraded from VVI to DDD. METHOD: From September 8, 2001 to March 18, 2004, at the Instituto do Cora

  10. Modelo de cuidado transicional à mãe da criança com cardiopatia congênita Modelo de atención transicional a la madre del niño con cardiopatía congénita Model of maternal transitional care to mothers of a child with congenital heart disease

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    Daniele Laís Brandalize Rocha

    2009-06-01

    Full Text Available OBJETIVOS: Desvelar o significado da vivência materna no processo de transição de doença-saúde do filho com cardiopatia congênita; identificar os comportamentos apresentados pela mãe durante a vivência e propor um modelo de cuidado transicional à mãe, à luz da teoria de enfermagem de Roy. MÉTODOS: Pesquisa qualitativa, desenvolvida por meio do método de pesquisa-cuidado, com entrevista semi-estruturada de 10 mães que acompanhavam seus filhos no pós-operatório de cirurgia cardíaca em hospital pediátrico. RESULTADOS: Pela análise de conteúdo de Bardin foram apreendidas seis Unidades de Contexto e onze Unidades de Significação que revelaram alterações sofridas pelas mães em sua vida pessoal e familiar durante a vivência materna do processo de transição de saúde-doença do filho. CONCLUSÕES: O enfermeiro, ao conhecer o processo de transição vivenciado pela mãe auxilia a mobilizar os recursos que possui para o enfrentamento e adaptação à nova situação pela aplicação do modelo de cuidado transicional.OBJETIVOS: Develar el significado de la vivencia materna en el proceso de transición de enfermedad-salud del hijo con cardiopatía congénita; identificar los comportamientos presentados por la madre durante la vivencia y proponer un modelo de cuidado de transición a la madre, a la luz de la teoría de enfermería de Roy. MÉTODOS: Investigación cualitativa, desarrollada por medio del método de investigación-cuidado, con entrevista semi-estructurada a 10 madres que acompañaban a sus hijos en el post-operatorio de cirugía cardíaca en un hospital pediátrico. RESULTADOS: Por el análisis de contenido de Bardin (1991 se elaboraron seis Unidades de Contexto y once Unidades de Significado que revelaron alteraciones sufridas por las madres en su vida personal y familiar durante la vivencia materna del proceso de transición de salud-enfermedad del hijo. CONCLUSIONES: El enfermero, al conocer el proceso de transici

  11. Avaliação dos resultados tardios da operação de derivação cavo-pulmonar bidirecional, no tratamento paliativo de cardiopatias congênitas com câmara ventricular única Assessment of late results of bidirecional cavopulmonary shunt on paliative treatment of congenital heart disease with functional isolated ventricular chamber

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    Miguel Angel Maluf

    1994-06-01

    Full Text Available No período de março de 1990 a janeiro de 1994, 17 pacientes com idades de 1 a 13 anos (média: 7 anos, portadores de cardiopatias congênitas com câmara ventricular única funcionante, foram submetidos a operação de derivação cavo-pulmonar bidirecional. Nove pacientes tinham atresia tricúspide (AT, 7 do tipo lb, 1 tipo le e 1 tipo Mb. Cinco pacientes tinham dupla via de entrada ventricular tipo ventrículo direito (DVEVD; 2 com comunicação interventricular(CIV múltipla+hipoplasiado VD; 1 com atresia pulmonar com septo interventricular íntegro (APc/SIVI. Nove (52,9% pacientes tinham operações paliativas prévias. A operação foi realizada com auxílio da circulação extracorpórea (CEC em 12 (70,5% casos e mediante derivação do fluxo sangüíneo da veia cava superior (VCS para o átrio direito (AD em 5 (29,5% casos. Em todos os casos a VCS foi anastomosada à artéria pulmonar direita (APD, interrompendo o fluxo sangüíneo para o pulmão, fechando a valva pulmonar e ligando a derivação de Blalock-Taussig pérvio. Houve 3 (17,6% óbitos no pós-operatório imediato (POI e 2 (14,2% no pós-operatório tardio (POT. Doze (70,5% pacientes estão em acompanhamento clínico, com um tempo de evolução de 2 a 46 meses. Um paciente foi submetido ao 2º tempo da operação, tunelizando a veia cava inferior (VCI para a APD, com sucesso. A avaliação do fluxo da derivação cavo-pulmonar bidirecional está sendo realizada pela ecodopplercardiografia e ressonância nuclear magnética e a perfusão pulmonar mediante cintilografia radioisotópica. A indicação do 2º tempo da operação obedece à própria evolução clínica e avaliação da saturação arterial durante a cicioergometria. A derivação cavo-pulmonar bidirecional permite uma adaptação progressiva do fluxo venoso para o pulmão, diminuindo a sobrecarga de volume do ventrículo, preparando o paciente para a derivação venosa total.From March 1990 to January 1994, 17

  12. Estudo comparativo da ultrafiltração convencional e associação de ultrafiltração convencional e modificada na correção de cardiopatias congênitas com alto risco cirúrgico Comparative study of standard ultrafiltration and its association with modification for the correction of high surgical risk congenital heart diseases

    Directory of Open Access Journals (Sweden)

    Miguel Angel MALUF

    1999-07-01

    Full Text Available A necessidade de correção cirúrgica de má-formações cardíacas complexas, que requerem tempos prolongados de circulação extracorpórea (CEC aumentou a morbimortalidade devido a retenção hídrica e reação inflamatória sistêmica. O objetivo deste estudo é comparar a evolução pós-operatória imediata de pacientes submetidos a ultrafiltração convencional (UFC durante a CEC e ultrafiltração modificada (UFM após CEC. Quarenta e um pacientes submetidos a correção cirúrgica de cardiopatias congênitas foram divididos em 2 grupos: G1: 21 pacientes com idade de 15 dias a 36 meses (mediana: 11 meses e peso de 3,6 a 13,5 kg (M: 7,27 ± 3,07, operados entre 1996 e 1997, foram submetidos a UFC. G2: 20 pacientes com idade de 9 dias a 36 meses (mediana: 5,5 meses e peso entre 2,2 e 12 kg (M: 5,7 ± 2,5, operados entre 1997 e 1998, foram submetidos a UFC+UFM. Dentre as operações mais freqüentes temos: ventriculosseptoplastia, 15 (36,5% casos; operação de Jatene, 10 (24,3% casos; correção de defeito septal A-V total, 7 (17,0% casos etc. A análise estatística de idade, peso e complexidade cirúrgica mostrou semelhança entre os grupos. Houve 6 (28,5% óbitos no G1 e 4 (20% no G2, (p=0,71. O volume médio ultrafiltrado no G1 (UFC foi 143,3 ml e no G2 (UFC+UFM foi 227,0 ml, (pSurgical correction of complex cardiac malformations that require extended extracorporeal circulation (ECC increase morbidity/mortality due to water retention and systemic inflammatory reaction. The purpose of this study is to compare the immediate postoperative evolution of patients submitted to conventional ultrafiltration (CUF during ECC and modified ultrafiltration (MUF after ECC. Forty-one patients submitted to surgical correction of congenital cardiac disease were divided into 2 groups: G1 - 21 patients with ages from 15 days to 36 months (median 11 months and weighing from 3.6 kg (M: 7.27 ± 3.07, operated on between 1996 and 1997 were submitted to CUF

  13. Características de los cuidadores de niños con cardiopatías congénitas complejas y su calidad de vida Características dos cuidadores de crianças com cardiopatias congênitas complexas e sua qualidade de vida Characteristics of care takers for children with complex congenital heart defects and the quality of life of the former

    Directory of Open Access Journals (Sweden)

    ELIZABETH ROMERO MASSA

    2010-06-01

    Full Text Available Objetivo: establecer la relación entre las características y la calidad de vida de los cuidadores familiares de niños con cardiopatías congénitas. Método: estudio analítico transversal. Se midió la calidad de vida con el instrumento propuesto por Ferrell et ál. (1997, "Medición de la calidad de vida de un miembro familiar que brinda cuidados a un paciente". Los cuidadores se caracterizaron con la encuesta "Caracterización de los cuidadores", diseñada por el grupo de Cuidado al Paciente Crónico, de la Universidad Nacional de Colombia. Para estimar la asociación entre las características de los cuidadores y las dimensiones de la calidad de vida se utilizó el análisis a través de los intervalos de confianza, considerando una diferencia de promedios significativa aquella en la cual que su intervalo de confianza no pasa por 0. Resultados: participaron 91 cuidadores familiares principales de niños con cardiopatías congénitas complejas de la ciudad de Cartagena. Incluyen la asociación entre las características de los cuidadores y los cuatro aspectos del bienestar que evalúan la calidad de vida según Ferrel. Las características que mostraron mayor asociación con las dimensiones de la calidad de vida fueron edad, nivel socioeconómico, tiempo de cuidado y ser único cuidador. Conclusiones: al asociar las características de los cuidadores con la calidad de vida de los mismos se encontró que el nivel socioeconómico y ser único cuidador guarda asociación con el bienestar psicológico reportado, mientras que ser único cuidador se asocia en forma significativa con la dimensión social.Objetivo: estabelecer a relação entre as características e a qualidade de vida dos cuidadores familiares de crianças com cardiopatias congênitas. Método: estudo analítico transversal. A qualidade de vida foi medida mediante o instrumento proposto por Ferrell et ál. (1997, "Medição da qualidade de vida de um membro familiar que cuida de

  14. Perfil das crianças submetidas à correção de cardiopatia congênita e análise das complicações respiratórias Perfil de los niños sometidos a la corrección de cardiopatía congénita y análisis de las complicaciones respiratorias Profile of children undergoing congenital heart surgery and analysis of their respiratory complications

    Directory of Open Access Journals (Sweden)

    Priscila Mara N. Oliveira

    2012-01-01

    Full Text Available OBJETIVO: Descrever as características demográficas e clínicas de crianças submetidas à cirurgia de correção de cardiopatia congênita (CC em um hospital universitário, comparando pacientes com e sem complicações respiratórias no pós-operatório. MÉTODOS: Estudo retrospectivo, realizado por meio de consulta de prontuários de crianças submetidas à cirurgia corretiva de CC em hospital universitário brasileiro no período de novembro de 2006 a setembro de 2007. Foram analisados dados relativos a idade, sexo, peso, comorbidades e tipo de CC das crianças incluídas no estudo, comparando pacientes com e sem complicações respiratórias no pós-operatório. Foram utilizados o teste de Mann-Whitney e exato de Fisher, considerando-se significante pOBJETIVO: Describir las características demográficas y clínicas de niños sometidos a la cirugía de corrección de cardiopatía congénita (CC en un hospital universitario, comparando pacientes con y sin complicaciones respiratorias en el post-operatorio. MÉTODOS: Estudio retrospectivo, realizado por medio de consulta de prontuarios de niños sometidos a la cirugía correctiva de CC, en el Hospital de Clínicas de la Universidad Estadual de Campinas (Unicamp, en el periodo de noviembre de 2006 a septiembre de 2007. Se analizaron datos relativos a la edad, sexo, peso, comorbidades y tipo de CC de los niños incluidos en el estudio, comparando pacientes con y sin complicaciones respiratorias en el post-operatorio. Se utilizaron el test de Mann-Whitney y el exacto de Fisher, considerándose significante pOBJECTIVE: To describe the profile of children that undergo surgical correction of congenital heart disease (CHD in a university hospital and to compare patients with and without postoperative respiratory complications. METHOD: This observational analytical study reviewed the records of children that underwent corrective surgery for CHD a Brazilian University Hospital during 11 months. The

  15. Volatile organic compounds determination in the atmosphere of Mexico City by the use of optical systems and non conventional methods; Determinacion de compuestos organicos volatiles en la atmosfera de la Ciudad de Mexico mediante el uso de sistemas opticos y metodos convencionales

    Energy Technology Data Exchange (ETDEWEB)

    Ruiz, Maria Esther; Arriaga, Jose Luis; Garcia, Isidoro [Gerencia de Ciencias de Ambiente, Instituto Mexicano del Petroleo, Mexico, D.F. (Mexico)

    1996-04-01

    . Las tres tecnicas ofrecen diferentes ventajas para la determinacion de las especies en la atmosfera, las muestras en canisteres nos dan la concentracion total de los COV y la concentracion de mas de 200 especies diferentes asi como tambien permiten la determinacion de CO y CH{sub 4}. El muestreo en cartuchos puede utilizarse para detectar emisiones ocasionales. Por otro lado el DOAS es un medio para seguir la evolucion de especies selectas durante periodos largos que permite analizar la influencia de los parametros meteorologicos como la velocidad y direccion del viento, sobre la concentracion de cada contaminante. Los resultados que aqui se presentan se obtuvieron mediante la colaboracion del grupo de Ciencias del Ambiente del Instituto Mexicano del Petroleo (GCA-IMP) con otros grupos.

  16. Redução do período de internação e de despesas no atendimento de portadores de cardiopatias congênitas submetidos à intervenção cirúrgica cardíaca no protocolo da via rápida The reduction in hospital stay and costs in the care of patients with congenital heart diseases undergoing fast-track cardiac surgery

    Directory of Open Access Journals (Sweden)

    Alfredo Manoel da Silva Fernandes

    2004-07-01

    Full Text Available OBJETIVO: Avaliar o atendimento de cardiopatas congênitos e cardiopatas isquêmicos submetidos à cirurgia cardíaca no protocolo de atendimento na via rápida (fast-track recovery em relação ao convencional. MÉTODOS: Avaliada a movimentação de 175 pacientes, 107 (61% homens e 68 (39% mulheres, idades entre 0,3-81 anos nas diferentes unidades hospitalares. RESULTADOS: A taxa de alta das diferentes unidades hospitalares por unidade de tempo, dos cardiopatas congênitos atendidos no protocolo da via rápida em relação ao convencional foi: a 11,3 vezes a taxa de alta quando assistidos no protocolo da via convencional, quanto ao tempo de permanência no centro cirúrgico; b 6,3 vezes quanto à duração da intervenção cirúrgica; c 6,8 vezes quanto à duração da anestesia; d 1,5 vezes quanto à duração da perfusão; e 2,8 vezes quanto à permanência na unidade de recuperação pós-operatória I; f 6,7 vezes quanto à permanência no hospital (período de tempo entre a data da internação e a data da alta; g 2,8 vezes quanto à permanência na unidade de internação pré-operatória; h 2,1 vezes quanto à permanência na unidade de internação após a alta da recuperação pós-operatória; i associada com redução de despesas pré e pós-operatórias. A diferença não foi significativa nos portadores de cardiopatia isquêmica. CONCLUSÃO: Verificou-se redução do período de internação e de despesas no atendimento dos pacientes submetidos à intervenção cirúrgica cardíaca no protocolo da via rápida.OBJECTIVE: To assess the care provided to patients with congenital heart diseases and ischemic heart diseases undergoing cardiac surgery according to the fast-track recovery protocol compared with those undergoing the conventional procedure. METHODS: The transfer of patients from one hospital unit to another was assessed for 175 patients, 107 (61% men and 68 (39% women, with ages ranging from 0.3 to 81 years. RESULTS: The

  17. The federal law of the Revenue Agency responsibility, the national oil industry and the determination of the average price of the Mexican mixture for export: implications and limitations; La ley federal de responsabilidad hacendaria, la industria petrolera nacional y la determinacion del precio promedio de la mezcla mexicana de exportacion: implicaciones y limitaciones

    Energy Technology Data Exchange (ETDEWEB)

    Baltierra, Lauro; Huerta, Carlos E.; Ruiz Alarcon, Fluvio Cesar [LX legislatura, Camara de Diputados, Mexico, D.F. (Mexico)

    2006-11-15

    en la economia del pais, al propiciar un proceso de financiarizacion del sector, asi como las implicaciones que se originan de la fijacion inamovible del precio del petroleo por disposicion legal. Como ello limita las potestades constitucionales de la Camara de Diputados al negarle la facultad, que ejercia hasta la expedicion de la Ley, para evaluar las estimaciones del Ejecutivo Federal respecto al precio promedio de la mezcla mexicana de exportacion. En el primer apartado se realiza un balance de como el Presupuesto de Egresos de la Federacion se proyecta como un instrumento para frenar la inversion publica en el sector petrolero. En el segundo se atienden aspectos relacionados con la estimacion de precio del petroleo a partir de la Ley de Federal de Presupuesto y Responsabilidad Hacendaria, senalando las incongruencias que significa establecer una formula para la determinacion del mismo. En un tercer apartado, se tratan la subvaluacion de los precios del crudo como factor clave para el uso discrecional de los excedentes petroleros. En el cuarto apartado, se analizan los Criterios Generales de Politica Economica para el ano 2007, que conforme a la nueva Ley Federal de Presupuesto y Responsabilidad Hacendaria fueron remitidos a la Camara de Diputados por el Ejecutivo Federal en el mes de abril. Por ultimo, se presentan las estimaciones de la mezcla mexicana de exportacion para 2007 que a consideracion de los autores oscilara entre 50 y 51 dolares como promedio anual.

  18. Determination of heat losses in the Cerro Prieto, Baja California, geothermal field steam transportation network based on the thermal insulation condition of the steam pipelines; Determinacion de perdidas de calor en la red de transporte de vapor del campo geotermico de Cerro Prieto, Baja California, con base en el estado fisico del aislamiento termico de vaporductos

    Energy Technology Data Exchange (ETDEWEB)

    Ovando Castelar, Rosember; Garcia Gutierrez, Alfonso; Martinez Estrella, Juan Ignacio [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)]. E-mail: rovando@iie.org.mx; Canchola Felix, Ismael; Jacobo Galvan, Paul; Miranda Herrera, Carlos; Mora Perez, Othon [Comision Federal de Electricidad, Gerencia de Proyectos Geotermoelectricos, Residencia General de Cerro Prieto, Mexicali, B.C. (Mexico)

    2011-07-15

    . En este trabajo se analiza el impacto del estado fisico del aislamiento termico sobre las perdidas de calor en las tuberias de la red de vaporductos del CGCP y se estima la magnitud de estas perdidas mediante la aplicacion de un metodo iterativo. Este metodo permitio determinar la temperatura de superficie con base en un balance de calor que considera los tres mecanismos basicos de transferencia de calor: conduccion, conveccion y radiacion termica. Finalmente, con base en la determinacion de longitudes y diametros para cada estado de aislamiento de los vaporductos y en las condiciones de operacion globales de la red, se cuantifican las perdidas de calor a traves de los aislantes para toda la red de transporte. Los resultados obtenidos permitieron evaluar la magnitud de estas perdidas en comparacion con la perdida global de energia que ocurre durante el transporte de vapor desde los pozos hasta las plantas de generacion electrica.

  19. Determinacion de Caracteristicas Opticas del Telescopio OAN150

    Science.gov (United States)

    Galan, M. J.; Cobos, F. J.

    1987-05-01

    En el Observatorio de Calar Alto, en Almería, España, está ubicado un telescopio de 15O-cms de diámetro -construído por REOSC- perteneciente al Observatorio Astronómico Nacional, con sede en Madrid, España. La infraestructura técnica del OAN ha sido tradicionalmente débil y actualmente se está haciendo un esfuerzo por fortalecerla. Existe una información muy limitada del telescopio en general; de su óptica en particular se conocían los valores de los parámetros principales pero sin saber si éstos corresponden a valores teóricos ó de construcción. Por ello se consideró necesario iniciar una investigación para conocer en detalle los valores reales de las componentes ópticas del telescopio, obteniéndose algunos resultados de interés. El primario del telescopio OANl5O es aproximadamente F/3 y el siste ma en su conjunto es F/8.2, con su sistema corrector de campo. En términos generales, la imagen es satisfactoria en todo el campo y, sin sistema corrector, la imagen axial también es buena. En un futuro muy cercano se piensa diseñar instrumentación adicional para este telescopio. Conocer con mayor precisión sus características puede ser de gran utilidad para tal fin, pues se efectúan los cálculos considerando conjuntamente al telescopio y al instrumento.

  20. FATORES DE RISCO PARA QUEDAS EM PACIENTES HOSPITALIZADOS COM CARDIOPATIA ISQUÊMICA

    Directory of Open Access Journals (Sweden)

    Nila Larisse Silva de Albuquerque

    2013-01-01

    Full Text Available El propósito del estudio fue identificar la presencia de diagnósticos de enfermería Riesgo de Caídas en personas con cardiopatía isquémica en hospital de Fortaleza, Ceará, Brasil. Estudio descriptivo y cuantitativo, cuyos datos fueron recogidos de julio/2010 a febrero/2011, a través de entrevistas, examen físico y consulta con registros médicos. Fueron investigados el perfil sociodemográfico y clínico del paciente y check-list con factores de riesgo del diagnóstico de enfermería. De los 86 investigados, 56,5% eran del sexo masculino, con media de 63,95(± 12,6 años de edad. Los participantes poseían más de dos factores de riesgo para caídas, 46,5% presentaban entre seis y nueve factores concurrentes. Entre los factores de riesgo, se destacaron: uso de antihipertensivos (98,8%, dificultad visual (66,3% e insomnio (54,3%. En este contexto, enfermeros deben planear la atención para prevención de caídas, especialmente en pacientes con cardiopatía isquémica en entorno hospitalario.

  1. Ventriculectomia parcial: um novo conceito no tratamento cirúrgico de cardiopatias em fase final

    OpenAIRE

    Batista,Randas J. V; Santos,José Luiz Verde dos; Franzoni,Marcos; Araujo,A. C. F; Takeshita,Noriaki; Furukawa,Murilo; Bochino,Lise; Precoma,Dalton; Neri,Paulo; Thome,Lisias; Oliveira, Eduardo; Carvalho,Rosane; Marco A Cunha

    1996-01-01

    A melhora clínica da função cardíaca pós aneurismectomia de ventrículo esquerdo e/ou cardiomioplastia com o músculo grande dorsal parece ser, ao menos parcialmente, devida ao remodelamento do ventrículo esquerdo. Através de pesquisa em nosso laboratório experimental com carneiros, demonstramos que o aumento do diâmetro do ventrículo é mais importante que a perda de massa muscular para a deterioração da função ventricular. Sabendo-se que em miocardiopatia dilatada não ocorre aumento de massa m...

  2. Os estilos de vida nos doentes com cardiopatia isquémica

    OpenAIRE

    Lopes, Maria Amélia Santos; Duarte, João Carvalho, co-orient.; Dias, António Madureira, orient.

    2012-01-01

    Enquadramento: Os estilos de vida estão associados às doenças cardiovasculares e à mortalidade. Os benefícios da promoção de estilos de vida saudáveis na prevenção das doenças cardiovasculares são inequívocos, bem conhecidos pela comunidade científica e divulgados à população em geral. Contudo, as evidências de estilos de vida não saudáveis continuam a marcar uma tendência nas populações, principalmente nas sociedades ocidentais. Objetivos: verificar que estilos de vida apre...

  3. Avaliação pulmonar em crianças portadoras de cardiopatia congênita acianótica e hiperfluxo pulmonar através de tomografia computadorizada Evaluación pulmonar en niños portadores de cardiopatía congénita acianótica e hiperflujo pulmonar a través de tomografía computadorizada Computed tomography in pulmonary evaluation of children with acyanotic congenital heart defect and pulmonary hyperflow

    Directory of Open Access Journals (Sweden)

    Solange Gimenez

    2009-10-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: Disfunção respiratória é frequente em crianças com cardiopatias congênitas acianóticas com hiperfluxo pulmonar (CCAHP, porém pouco é conhecido sobre a estrutura pulmonar destes pacientes. O objetivo deste estudo foi quantificar os volumes de gás e tecido e a distribuição da aeração pulmonar nesta população. MÉTODOS: Após aprovação do Comitê de Ética institucional e obtenção do consentimento escrito pós-informado, foram obtidas tomografias computadorizadas torácicas em sete crianças com CCAHF. As imagens pulmonares direita e esquerda foram contornadas em todas as imagens e os volumes e pesos pulmonares foram computados a partir dos dados volumétricos. As comparações entre esquerda e direita foram analisadas usando teste t de Student pareado e as correlações através de regressão exponencial. RESULTADOS: A idade mediana foi 20 meses e o peso foi de 9,9 kg. Volume pulmonar total (VPT foi de 66,7 ± 23,1 mL.kg-1, o de tecido 33,5 ± 15,7 mL.kg-1 e o de gás 33,1 ± 8,3 mL.kg-1. O pulmão direito representou 57,9% e o pulmão esquerdo 42,1% do VPT (p JUSTIFICATIVA Y OBJETIVOS: La disfunción respiratoria es frecuente en niños con cardiopatías congénitas acianóticas con hiperflujo pulmonar (CCAHP, sin embargo, se conoce muy poco sobre la estructura pulmonar de esos pacientes. El objetivo de este estudio, fue cuantificar los volúmenes de gas y tejido y la distribución de la aeración pulmonar en esa población. MÉTODOS: Después de la aprobación por parte del Comité de Ética Institucional y de la obtención del consentimiento escrito informado, se obtuvieron tomografías computadorizadas torácicas en siete niños con CCAHF. Las imágenes pulmonares derecha e izquierda fueron perfiladas en todas las imágenes, y los volúmenes y los pesos pulmonares fueron computados a partir de los datos volumétricos. Las comparaciones entre izquierda y derecha fueron analizadas usando el test t de

  4. Effects of JPEG data compression on magnetic resonance imaging evaluation of small vessels ischemic lesions of the brain; Efeitos da compressao de dados JPEG na avaliacao de lesoes vasculares cerebrais isquemicas de pequenos vasos em ressonancia magnetica

    Energy Technology Data Exchange (ETDEWEB)

    Kuriki, Paulo Eduardo de Aguiar; Abdala, Nitamar; Nogueira, Roberto Gomes; Carrete Junior, Henrique; Szejnfeld, Jacob [Universidade Federal de Sao Paulo (UNIFESP/EPM), SP (Brazil). Dept. de Diagnostico por Imagem]. E-mail: paulokuriki@gmail.com

    2006-01-15

    Objective: to establish the maximum achievable JPEG compression ratio without affecting quantitative and qualitative magnetic resonance imaging analysis of ischemic lesion in small vessels of the brain. Material and method: fifteen DICOM images were converted to JPEG with a compression ratio of 1:10 to 1:60 and were assessed together with the original images by three neuro radiologists. The number, morphology and signal intensity of the lesions were analyzed. Results: lesions were properly identified up to a 1:30 ratio. More lesions were identified with a 1:10 ratio then in the original images. Morphology and edges were properly evaluated up toa 1:40 ratio. Compression did not affect signal. Conclusion: small lesions were identified ( < 2 mm ) and in all compression ratios the JPEG algorithm generated image noise that misled observers to identify more lesions in JPEG images then in DICOM images, thus generating false-positive results.(author)

  5. Cardiovascular risk factors in chronic treatment with antipsychotic agents used in primary care.

    Science.gov (United States)

    Mundet-Tudurí, Xavier; Iglesias-Rodal, Manuel; Olmos-Domínguez, Carmen; Bernard-Antoranz, M Lluïsa; Fernández-San Martín, M Isabel; Amado-Guirado, Ester

    2013-12-01

    Objetivo. Comparar la prevalencia de factores de riesgo cardiovascular (FRCV) y eventos vasculares en pacientes tratados con antipsicoticos, comparandolos con los no tratados. Sujetos y metodos. Estudio descriptivo transversal de pacientes atendidos en atencion primaria de la ciudad de Barcelona y tratados con antipsicoticos entre el 2008 y el 2010, comparandolos con una poblacion no tratada. Se registraron las variables antropometricas y clinicas y los FRCV. Se estudio por separado a pacientes adultos y ancianos, y a los tratados con antipsicoticos tipicos y atipicos. Resultados. Un total de 14.087 pacientes habian sido tratados con antipsicoticos (63,4% atipicos). El mas prescrito fue la risperidona. Se aparejaron 13.724 pacientes de la misma edad y genero, pero no tratados (n total = 27.811). Los tratados con antipsicoticos presentaron una prevalencia superior de obesidad (16,9% frente a 10,6%), tabaquismo (22,2% frente a 11,1%), diabetes mellitus (16% frente a 11,9%) y dislipemia (32,8% frente a 25,8%) (p adultos (odds ratio = 2,33) como en los ancianos (odds ratio = 1,64). La prevalencia de cardiopatia isquemica fue similar en ambos grupos (odds ratio = 0,97). No se observaron diferencias significativas entre los tratados con un antipsicotico tipico o atipico. Conclusiones. Los pacientes tratados con antipsicoticos presentaron una mayor prevalencia de FRCV (diabetes, obesidad y tabaquismo). La presencia de ictus fue superior entre los tratados con antipsicoticos. No se detectaron diferencias importantes entre los pacientes tratados con antipsicoticos tipicos y atipicos.

  6. Aspectos raciais dos "megas" e da cardiopatia na doença de Chagas crônica

    Directory of Open Access Journals (Sweden)

    Lineu José Miziara

    1981-06-01

    Full Text Available O estudo de 724 pacientes chagásicos crônicos mostrou que a insuficiência cardíaca congestiva é mais freqüente e de aparecimento mais precoce nos pacientes de raça negra do que nos brancos. A ocorrência de "megas" foi ligeiramente inferior nos chagásicos negros não sendo estatisticamente significativa a diferença observada. A maior freqüência de insuficiência cardíaca nos pretos parece estar relacionada a características biológicas do tecido conjuntivo que condicionam uma resposta fibrosante mais acentuada no miocârdio agredido pela Tripanossomose. Estas observações estariam de acordo com outros estudos sobre a doença de Chagas que admitem ser a denervação o fator mais importante para o aparecimento dos "megas" e a inflamação com fibrose miocârdica acentuada um elemento básico para explicar a insuficiência cardíaca.The study of 724 patients with chronic chagas's disease showed that the cardiac faiture is more frequent and appears earlier in negroes patients when compared to white patients. The occurrence of "megas" was slightly lover in the negroes but the difference was not statisticaiiy significant. The higher frequency of cardiac faiture in the negrões seems to be caused by biological characteristics of the conective tissue which respond to trypanossomiasis with a more severe degree of fibrosis. These findings agree with other reports on Chagas's disease in which it is admitted that the "megas" are chiefly the result of dennervation and cardiac faiture is principally caused by infiammation with myocardial fibrosis.

  7. Gastrostomia endoscópica em pacientes com cardiopatia complicada Percutaneous endoscopic gastrostomy in cardiologic complicated patients

    Directory of Open Access Journals (Sweden)

    Celso CUKIER

    2000-10-01

    Full Text Available Pacientes cardiopatas complicados com isquemia cerebral e insuficiência cardíaca necessitam terapia nutricional enteral prolongada por se apresentarem em situação de risco nutricional. Complicações advindas do uso prolongado da sonda nasoenteral poderiam ser evitadas com a execução da gastrostomia endoscópica. Esta é alternativa técnica para acesso ao tubo digestivo em nutrição enteral. O objetivo deste estudo foi avaliar o tempo de indicação para gastrostomia endoscópica em pacientes com nutrição enteral com uso de sonda nasoenteral e as principais complicações do procedimento. Doze pacientes foram submetidos a gastrostomia endoscópica, sendo oito do sexo masculino. A idade média foi de 62,42 + 22,10 anos. A indicação principal foi síndrome isquêmica cerebral após parada cardiorespiratória por patologia clínica (sete pacientes ou cirurgia cardiovascular complicada (cinco. O tempo médio para indicação da gastrostomia endoscópica foi de 35,58 + 26,79 dias após introdução da nutrição enteral. Não houve intercorrências com o procedimento e, no período pós-operatório tardio, ocorreu infecção do orifício de inserção da gastrostomia endoscópica em um caso, resolvida com cuidados locais. Em conclusão, a gastrostomia endoscópica é técnica segura, com baixa incidência de complicações. Pode ser realizada em ambulatório, no leito do paciente, ou em centro de terapia intensiva e sua indicação deveria ser mais precoce.Complicated cardiologic patients with brain ischemia and heart failure need long term enteral nutrition. Long term nasoenteral tuibe feeding may cause complications that could be avoided with percutaneous endoscopic gastrostomy. The aim of this study was to evaluate the indications for percutaneous endoscopic gastrostomy and its main complications. Twelve patients were submitted to percutaneous endoscopic gastrostomy (eight male with main age of 62,42 ± 22,10 years old. Brain ischemia was the main indication of percutaneous endoscopic gastrostomy and occurred after 35,58 ± 26,79 days, after iniciated enteral nutrition. There were no complications during procedure. On late post operatory period there were local infection in one cases, treated with local care. In conclusion, percutaneous endoscopic gastrostomy is a secure technique with low incidence of complications and its indication should be earlier.

  8. Valvoplastia mitral em pacientes jovens com cardiopatia reumática Mitral valvuloplasty in young patients with rheumatic heart disease

    Directory of Open Access Journals (Sweden)

    Fernando Antônio Fantini

    1992-06-01

    Full Text Available No período, de setembro de 1988 a janeiro de 1992, 56 pacientes com até 20 anos de idade (4 a 20 anos, média de 12,7 com insuficiência mitral pura ou predominante de etiologia reumática foram submetidos a valvoplastia mitral. Noventa e quatro por cento dos pacientes estavam em classe funcional III ou IV da NYHA. A técnica cirúrgica básica usada em todos os pacientes foi a anuloplastia assimétrica preconizada por Reed et alii 31, associada em 69,7% dos casos a outros procedimentos sobre as cúspides e aparelho subvalvar mitral. Dois pacientes foram submetidos, concomitantemente, a plastia da valva tricúspide e 4 a troca da valva aórtica. Estudo ecodopplercardiográfico per-operatório foi utilizado após a correção em todos os casos e mostrou ausência de lesões residuais em 76% dos pacientes e insuficiência mitral discreta nos demais. Náo houve mortalidade hospitalar. Ecopplercardiograma realizado antes da alta hospitalar mostrou boa correlação com o estudo per-operatório. Foi possível colher informações do seguimento tardio de 53 pacientes. Ocorreu 1 óbito tardio três meses após a cirurgia, por morte súbita. Quatro pacientes foram reoperados e submetidos a troca valvar: uma paciente no 4º mês de pós-operatório (PO, por falha primária do procedimento, e outros três no 6º, 34º e 38º meses de PO, por comprovada recidiva da cardite reumática. Os demais encontram-se em classe funcional I e II (NYHA. Concluímos, baseados nos resultados apresentados, que a anuloplastia mitral assimétrica é um excelente procedimento para pacientes jovens com valvopatia reumática, constituindo-se numa boa alternativa à troca de valva ou implante de anéis, sendo, no entanto, extremamente importante o controle de recidivas da doença reumática.From September 1988 to July 1990, 56 patients under 20 years of age (mean 12.7 ± 5.12 years with pure or predominant mitral valve regurgitation secondary to rheumatic valve disease, underwent mitral valvuloplasty. Ninety-three percent of the patients were in functional class III ou IV (NYHA. The basic surgical technique used in all patients was a modified measured assy metric anuloplasty which was associated in 69.7% of the cases with another plastic procedure. Intraoperative echodopplercardiography was always used and showed a good correlation with the postoperatoty echo studies, with 64% of the patients free from residual lesions. There was no hospitalar mortality. Fifty-three (94.6% patients were followed from 1 to 40 months (mean 16.3%. There was one sudden death 3 months after the operation. Four patients were reoperated upon, 3 of whom due to recurrent rheumatic carditis. The remainder are in functional class I or II (NYHA. We conclude based on these early results that assymetric mitral anuloplasty is an excellent procedure for young patients with rheumatic heart disease, being a good alternative to valve replacement or ring implantations.

  9. Determination of Tc-99 in radioactive wastes; Determinacion de Tc-99 en desechos radiactivos

    Energy Technology Data Exchange (ETDEWEB)

    Rivera S, A. A.

    2015-07-01

    Tc-99 is a fission product and one of the most important radionuclides from the view point of safety assessment for the disposal of radioactive waste because of its long half-life (2.1 x 10{sup 5} years) and high mobility in soil-water systems, if this is released into the environment in significant quantities can concentrate on plants and animals. Tc-99 is a pure beta emitter with a maximum energy of 292 KeV, so their quantification imposes destructive methods to be analyzed by liquid scintillation. Therefore the quantification of Tc-99 in ion exchange resins requires of the mineralization of these and separation of Tc-99 of other radioisotopes present in the resin. Therefore the object of this thesis is to develop a quantification method of Tc-99 content in spent exchange resins. So in order to track the behavior of technetium during digestion exchange resins and radiochemical separation, given its high volatility, in this work the {sup 99m}Tc is used. To determine the degree of mineralization of the resins, an analysis was performed by chromatography. Subsequently the method used to determine the percentage of {sup 99m}Tc aerosolized during mineralization of resin is described. After the method for the radiochemical separation of {sup 99m}Tc is presented by liquid-liquid extraction using crown ether as extractant; for this testing was performed by varying the molarity of the extractant, the ratio of solvent extractant, type of digestion of the resin and the presence of Sr-85, in order to study the behavior of {sup 99m}Tc in the presence of this radioisotope. Finally, a track beta spectra of a sample of {sup 99m}Tc eluted from a generator {sup 99}Mo/{sup 99m}Tc function of time was performed. (Author)

  10. Movimientos Propios y Determinacion de Pertenencia en el Cumulo Abierto NGC 2587

    Science.gov (United States)

    Bustos Fierro, I. H.; Calderón, J. H.

    The main aim of this work is the development and testing of a method for the astrometric measurement of photographic plates using a CCD camera as a digitizing device. This method is useful for the measurement of first epoch positions from more than 3000 plates in the vault of the Observatorio Astronómico de Córdoba, most of them more than 80 years old, in order to determine accurate proper motions. The developed method is applied to a Carte du Ciel plate in order to obtain positions of 4172 stars at epoch 1917.13 with errors about 0.20arcsec. By combining these positions with USNO-B1.0 and UCAC2 proper motions with accuracies around 2mas/year were determined for 4061 stars in a square field 2deg sided contaning the open clustes NGC 2587. Projected stellar density is studied in order to locate the cluster. Membership probabilities were determined from the proper motions by means of a non-parametric method and Monte Carlo simulations. 31 probable members were identified within 15arcmin around the projected overdensity asumed as the cluster, 22 of them within 10arcmin.

  11. DETERMINACION CUANTITATIVA DEL ESTADO ENERGETICO CON NEUROMETER EN PACIENTES Y CAMBIOS EN SU TRATAMIENTO CON ACUPUNTURA

    OpenAIRE

    RAMIREZ MONDRAGON, MERIT

    2009-01-01

    SE REALIZO ESTUDIO CLINICO INTERVENSIONISTA, DESCRIPTIVO, LONGITUDINAL, PROSPECTIVO, ABIERTO, TETRAETAPICO, PARA VER CAMBIOS ENERGETICOS DE 30 PACIENTES 22 MUJERES Y 8 HOMBRES TRATADOS CON ACUPUNTURA EN LA CLINICA DE ACUPUNTURA DEL HOSPITAL 20 DE NOVIEMBRE DEL ISSSTE. SE LES PRACTICO HISTORIA CLINICA Y MEDICION ENERGETICA CON EL NEUROMETRO PARA EVALUAR EL ESTADO ENERGETICO EL CUAL SE REPRESENTA EN UNA GRAFICA A PARTIR DE LOS VALORES TOMADOS DE LOS PUNTOS DE ACUPUNTURA DETERMINADOS POR EL...

  12. Determination of the thermal conductivity of metallic coatings; Determinacion de la conductividad termica de recubrimientos metalicos

    Energy Technology Data Exchange (ETDEWEB)

    Uc Way, Manuel Eugenio

    1998-02-01

    Due to the corrosion by high temperature there is a serious problem of unavailability and efficiency of the steam generators in the thermoelectric power stations. One of the parts that is more affected by this phenomenon is the superheater tube banks. In order to diminish this problem it is intended to apply to these tubes a metallic coating nickel and chromium based (80Ni20Cr), the deposition of the coating is made by the method of thermal spraying of powders by flame. The coating thickness once it has been deposited is of the order of 500mm, it is doubtless that the thermal flow between gases of combustion and the fluid conducted in the tubes is affected. That is why it is important to know the thermal conductivity of the coating in order to evaluate the impact that it has in the operation of the steam generator. This necessity is the one that gives rise to the present thesis project, in which a technique that allows to measure the thermal conductivity of the coating is designed. The experimentation is carried out taking as departure point the ASTM norm E1225-87 and is adapted to the characteristics of the material to prove. A test piece of stainless steel 316 was designed to measure the thermal flow that traverses the coating. First the experimental installation was characterized in order to determine its reliability. Later the experimentation was made finding an average thermal conductivity of 2.09{+-}0.72 W/m K in the temperature interval of 110-180 Celsius degrees. This value is 12.3% inferior to the corresponding one of a solid metal of the same composition. If we consider that in the high temperature banks of the steam generators the thermal flow is in the interval from 15.000 to 100.000 W/m{sup 2} and a coating thickness of the order of 500mm it would cause that this material would introduce a temperature difference of 0.6 to 4 Celsius degrees, respectively. Please note that for the highest thermal flow a maximum affectation of 4 Celsuis degrees is obtained. This value is small when it is compared with the effect that introduces the deposition of slag in these banks of tubes, that is in the order of 50 to 250 Celsuis degrees approximately, for this interval of thermal flows. [Espanol] Debido a la corrosion por alta temperatura se tiene un serio problema por indisponibilidad y eficiencia de los generadores de vapor en las centrales termoelectricas. Una de las partes mas afectadas por este fenomeno son los bancos de tubos de los sobrecalentadores. Con el objeto de disminuir dicho problema se pretende aplicar a los tubos antes mencionados un recubrimiento metalico a base de niquel y cromo (80Ni20Cr), la deposicion del recubrimiento se hace por el metodo de termorrociado de polvos por flama. El espesor del recubrimiento una vez que ha sido depositado es del orden de 500mm, es indudable que el flujo termico entre los gases de combustion y el fluido conducido en los tubos se ve afectado. Por esto es importante conocer la conductividad termica del recubrimiento a fin de evaluar el impacto que se tiene en el funcionamiento del generador de vapor. Esta necesidad es la que da lugar al presente proyecto de tesis, en el cual se disena una tecnica que permite medir la conductividad termica del recubrimiento. La experimentacion se lleva a cabo tomando como punto de partida la norma E1225-87 de la ASTM y se adecua a las caracteristicas del material a probar. Se diseno una probeta de acero inoxidable 316 para medir el flujo termico que atraviesa el recubrimiento. Primero se caracterizo la instalacion experimental a fin de determinar su confiabilidad. Posteriormente se realizo la experimentacion encontrandose una conductividad termica promedio de 12.09{+-}0.72 W/m K en el intervalo de temperatura de 110-180 grados Celsius. Este valor es 12.3% inferior al correspondiente a un metal solido de la misma composicion. Si consideramos que en los bancos de alta temperatura de los generadores de vapor el flujo termico se encuentra en el intervalo de 15,000 a 100,000 W/m2 y un espesor de recubrimiento del orden de 500mm se tendria que dicho material introduciria una diferencia de temperatura de 0.6 a 4 grados Celsius, respectivamente. Notese que para el mas alto flujo termico se tiene una afectacion maxima de 4 grados Celsius. Este valor es pequeno cuando se le compara con el efecto que introduce la deposicion de escoria en dichos bancos de tubos que es del orden de 50 a 250 grados Celsius aproximadamente para dicho intervalo de flujos termicos.

  13. Spectrographic Determination of Trace Constituents in Rare Earths; Determinacion espectrografica de impurezas en tierras raras

    Energy Technology Data Exchange (ETDEWEB)

    Capdevila, C.; Alvarez, F.

    1962-07-01

    A spectrographic method was developed for the determination of 18 trace elements in lanthanum, cerium, praseodimium, neodimium and samarium compounds. The concentrations of the impurities cover the range of 0,5 to 500 ppm. Most of these impurities are determined by the carrier distillation method. Several more refractory elements have been determined by total burning of the sample with a direct current arc or by the conduction briquet excitation technique with a high voltage condensed spark. The work has been carried out with a Hilger Automatic Large Quartz Spectrograph. (Author) 5 refs.

  14. Determination of carbonyl compounds in air by HPLC; Determinacion de compuestos carbonilicos en aire por HPLC

    Energy Technology Data Exchange (ETDEWEB)

    Garcia, S.; Perez, R.M.; Campos, A.; Gonzalez, D.

    1995-07-01

    A method for the determination of seven carbonyl compounds in air is presented. The procedure involve sampling of air by a Sep-Pak Cartridge impregnated with 2,4-dinitrophenylhydrazine. Elution was done with 3 mL of acetonitrile and the eluate was diluted to 5 mL. The analysis was done by HPLC with UV detection and external standard method quantification. It has been achieved relative standard deviations about 5% and detection limits of 80 ng/cartridge for formaldehyde, acetaldehyde and acetoacetonitrile. Three different types of samples (rural, urban, petrol emission) were successfully analyzed. (Author) 12 refs.

  15. Determinacion de periodos fundamentales del suelo mediante vibraciones ambientales en el municipio de Humacao, Puerto Rico

    Science.gov (United States)

    Cintron Aponte, Rommel

    La tecnica de Nakamura ha sido utilizada a nivel mundial para determinar periodos fundamentales del suelo. La tecnica consiste en calcular y graficar cocientes espectrales H/V de vibraciones ambientales registradas sobre el suelo. Mediciones de vibraciones ambientales fueron tomadas en 151 lugares dentro del municipio de Humacao, localizado al este de Puerto Rico. Los datos se procesaron utilizando espectros de Fourier y espectros de potencia. La tecnica fue validada al compararla con los resultados de cocientes espectrales H/V de registros de sismos debiles y tambien con una modelacion numerica realizada con datos de un ensayo "downhole". Las graficas de los cocientes espectrales H/V fueron divididas en casos y grupos, los cuales dependen de la facilidad para identificar el periodo fundamental pico y amplitudes en frecuencias menores de 1 Hz, respectivamente. Los resultados obtenidos con ambos espectros fueron comparados y se concluye que los mismos se complementan para proveer resultados mas confiables. Se crearon mapas de periodos fundamentales, factores de amplitud, isoperiodos y clasificacion sismica de sitio. Los mapas de isoperiodos fueron realizados en las zonas mas pobladas sobre depositos de suelo. El mapa de periodos fundamentales del suelo mostro buena correlacion con la geologia local. El mapa de clasificacion sismica derivado de periodos de sitio fue comparado con el mapa de clasificacion sismica derivado de barrenos geotecnicos. El mapa de clasificacion obtenido de periodos puede sobreestimar un poco algunas clasificaciones del suelo. Sin embargo, este mapa puede proveer un estimado aproximado de la velocidad de onda de corte promedio del suelo hasta una profundidad de 100 pies (30 metros).

  16. Determination of the TLD-100 physical parameters; Determinacion de parametros fisicos del TLD-100

    Energy Technology Data Exchange (ETDEWEB)

    Paucar J, J.; Picon C, C. [Instituto Nacional de Enfermedades Neoplasicas. INEN. Av. Angamos Este 2520, Lima 34 (Peru)

    1998-12-31

    This study was realized in the Physics service at the Radiotherapy Department of the National Institute of Neoplasic Diseases in Lima, Peru, it was determined the activation energy, the kinetic order and the frequency factor of the fifth peak of the TLD-100 thermoluminescent spectra using different algorithms. This was carried out in parallel with the implementation and design of a software and an interface associated with the Tl lecturer which allows a semiautomatic control for a thermoluminescent lecturer process. (Author)

  17. Determination of 230Th in soils; Determinacion de 230Th en suelos

    Energy Technology Data Exchange (ETDEWEB)

    Alvarez, A.; Palomares, J.

    1988-07-01

    A method for the determination of 230Th in environmental soils is described. Hydroxides formed, previous fusion with sodium peroxide are dissolved with HNO3 8N. The thorium is coprecipitated with F3La and purified by anion exchange (AG 1x8 50-100 mesh). Thorium is electroplated onto a stainless steel disc, 230xh is counted by alpha spectrometry and 234'fn u;;ed as tracer by beta counting. The chemical yield for 1g of soil sample is 60-80%. Minimum detectable activities are about 2 mBq/g.

  18. Quantitative spectrographic determination of zirconium minerals; Determinacion espectrografica cuantitative de circonio en minerales

    Energy Technology Data Exchange (ETDEWEB)

    Rocal Adell, M.; Alvarez Gonzalez, F.; Fernandez Cellini, R.

    1958-07-01

    The method described in the following report permits the quantitative determination of zirconium in minerals and rocks in a 0,02-100% of ZrO{sub 2} concentration rate. The excitation is carried out by a 10 ampere continuous current arc among carbon electrodes, and placing the sample in a crater of 2 mm depth. For low concentrations a dilution of the sample with the same weight as its own in carbon powder and with 1/25 of its weight of Co{sub 3}O{sub 4} (internal patron) is carried out. Line Zr 2571,4, Co 2585,3 and Co 2587,2 are used. (Author) 6 refs.

  19. DETERMINACION DEL COEFICIENTE DE DIFUSIÓN DEL AGUA EN SEMILLAS DE AMARANTHUS CRUENTUS REHUMECTADAS

    Directory of Open Access Journals (Sweden)

    María L. Balmaceda

    2015-01-01

    Full Text Available En este trabajo se estima experimentalmente los coeficientes de difusión efectivos de agua en semillas de amaranto rehumectadas para posteriores estudios del rendimiento y calidad del popeado o reventado del grano. Las semillas se rehumectaron por inmersión en agua a temperaturas de 11, 35 y 50 °C durante intervalos de tiempo de 0.5, 1, 2 y 4 h, determinándose gravimétricamente la humedad adquirida en cada condición estudiada. Para estimar el coeficiente de difusión se empleó el modelo difusional basado en la solución analítica de la segunda ley de Fick, considerando a la semilla de amaranto como una esfera de radio 0.6 mm. Se midieron las humedades de equilibrio en las condiciones estudiadas luego de un tiempo de 24 h de rehumectación. Los resultados obtenidos fueron similares a los encontrados por otros autores para semillas de quinua y otras variedades de amaranto, con características semejantes. Los valores de los coeficientes de difusión efectivos aumentaron con el incremento de la temperatura.

  20. Determination of the neutron mass; Determinacion de la masa del neutron

    Energy Technology Data Exchange (ETDEWEB)

    Amador V, P.; Chacon R, A.; Arcos P, A.; Rodriguez N, S.; Pinedo S, A.; Vega C, H.R. [Unidad Academica de Estudios Nucleares, Cipres 10, Fracc. La Penuela, 98068 Zacatecas (Mexico)]. e-mail: paus2281@yahoo.com.mx

    2005-07-01

    The binding energy of the deuteron was measured and it was determined the neutron mass starting from the nuclear reaction, {sup 1}{sub 0} n + {sup 1}{sub 1} H {yields}{sup 2}{sub 1} D + {gamma}. The produced photon is soon a gamma ray that is emitted when the hydrogen captures a thermal neutron. The photon energy was measured using two spectrometric systems for gamma rays. A system with a detector of NaI(TI) of 3'' x 3'' and the other one with a High-purity Germanium detector. The first detector has a bigger efficiency and a smaller resolution in comparison with the second detector. The energy of the measured photon is the binding energy of the deuteron. With the measurement of the photon energy and the masses of the proton and of the deuterium it was determined the neutron mass. The value of the mass obtained with both systems it was compared with the value reported in the literature. The nuclear reaction was induced in a volume of paraffin that it was bombing with a source {sup 239} PuBe whose activity is of 3.7 x 10{sup 10} Bq. (Author)

  1. Spectrographic determination of impurities in magnesium metal; Determinacion espectrografica de impurezas en magnesio

    Energy Technology Data Exchange (ETDEWEB)

    Capdevila, C.; Diaz-Guerra, J. P.

    1979-07-01

    The spectrographic determination of trace quantities of Al, B, Cd, Co, Cr, Cu, Fe, Li, Hn, Mo, Ni and Si in magnesium metal is described. Samples are dissolved with HNO{sub 3} and calcinate into MgO. In order to avoid losses of boron NH{sub 4}OH is added to the nitric solution. Except for aluminium and chromium the analysis is performed through the use of the carrier distillation technique. These two impurities are determined by burning to completion the MgO. Among the compounds studied as carriers (AgCl, AgF, CsCl, CuF{sub 2}, KCl and SrF{sub 2}) AgCl allows, In general, the best volatilization efficiency. Lithium determination is achieved by using KC1 or CsCl. Detection limits, on the basis of MgO, are in the range 0,1 to 30 ppm, depending on the element. (Author) 8 refs.

  2. Spectrographic determination of impurities in uranium tetrafluoride; Determinacion espectrografica de impurezas en tetrafluoruro de uranio

    Energy Technology Data Exchange (ETDEWEB)

    Capdevila Perez, C.; Roca Adell, M.; Alvarez Gonzalez, F.

    1967-07-01

    A carrier distillation method for the determination of Ag, Al, As, B, Cd, Cr, Cu, Fe, Mg, Mn, Ni, Pb, and Si in uranium tetrafluoride was develop ped. the previous addition of 25% Y{sub 2}3 prevents the excitation of uranium by conversion of the volatile UF{sub 4} into U{sub 3}0{sub 8} during the arc discharge. NaCl or Ga{sub 2}0{sub 3}, containing Ge and V as internal standards, are used as carriers, and samples are arced in 10 Amp. d.c. arc in a graphite anode cup. 7 mm diameter, 10 mm deep, being the weight of charge 300 mg. (Author) 14 refs.

  3. Fluorescence uranium determination; Determinacion de uranio por fluorescencia. I. Proyecto de equipo y comprobacion

    Energy Technology Data Exchange (ETDEWEB)

    Fernandez Cellini, R.; Crus Castillo, F. de la; Barrera Pinero, R.

    1960-07-01

    An equipment for analysis of uranium by fluorescence was developed in order to determine it at such a low concentration that it can not be determined by the most sensible analytical methods. this new fluorimeter was adapted to measure the fluorescence emitted by the phosphorus sodium fluoride-sodium carbonate-potasium carbonate-uranyl, being excited by ultraviolet light of 3,650 A the intensity of the light emitted was measure with a photomultiplicator RCA 5819 and the adequate electronic equipment. (Author) 19 refs.

  4. Rapid determination of effluent pollution by potentiometry; Determinacion rapida de la polucion de efluentes por potenciometria

    Energy Technology Data Exchange (ETDEWEB)

    Gil Rodriguez, M. [Esc. Tec. Sup. Ing. C. C. y P. Madrid (Spain)

    1998-12-31

    In this paper we are showing a analytical procedure of rapid determination of Biochemical Oxygen Demand, BOD, of effluents by potentiometry, that consumes about 30 minutes versus 5 days for classical procedure. It is expound kinetics equations of measurement evolution of BOD and the two analytical device more frequently used for its analysis. It is showing the design and performance of measurement device of rapid BOD. Vessel design constituted by two parts, one is a decantation funnel with communications in its wide and narrow sites, other is a measurement piece where fits both probe and gas inlet, that design helps liquid flow to probe impeding direct contact with the gas. The meter device in this analytical procedure is the Oxidation Reduction Potential meter, ORP, it is represented by Pt parallel KCI (3 M), Ag Cl (sat) Ag. (Author) 15 refs.

  5. Determination of palladium by flame photometry; Determinacion de paladio por fotometria de llama

    Energy Technology Data Exchange (ETDEWEB)

    Parallada Bellod, R.

    1964-07-01

    A study on the determination of palladium by lame photometry, fixing the most convent experimental conditions and using solvents to increase the emission of this elements is carried out. Among the organic solvents, acetone has been found the most efficient. The interferences produced by anions and cations have also been studied and an analytical method is related, in which lines of calibration of 0 to 100 ppm palladium re used. (Author) 7 refs.

  6. Fluorimetric determination of uranium in water; Determinacion fluorimetrica de uranio en aguas

    Energy Technology Data Exchange (ETDEWEB)

    Acosta L, E. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)]. e-mail: eal@nuclear.inin.mx

    1992-02-15

    The fluorimetric method for the determination of microquantities of uranium in water is described. This method covers the determination of uranium in water in the interval from 0.2 to 50 ppm on 50 ml. of radioactive base sample. These limits can be variable if the volume of the aliquot one of the base sample is changed, as well as the volume of the used aliquot one for to the final determination of uranium. (Author)

  7. Determination of Pu in soil samples; Determinacion de Pu en muestras de suelo

    Energy Technology Data Exchange (ETDEWEB)

    Torres C, C. O.; Hernandez M, H.; Romero G, E. T. [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico); Vega C, H. R., E-mail: carioli_32907@hotmail.com [Universidad Autonoma de Zacatecas, Unidad Academica de Estudios Nucleares, Cipres No. 10, Fracc. La Penuela, 98068 Zacatecas, Zac. (Mexico)

    2016-10-15

    The irreversible consequences of accidents occurring in nuclear plants and in nuclear fuel reprocessing sites are mainly the distribution of different radionuclides in different matrices such as the soil. The distribution in the superficial soil is related to the internal and external exposure to the radiation of the affected population. The internal contamination with radionuclides such as Pu is of great relevance to the nuclear forensic science, where is important to know the chemical and isotopic compositions of nuclear materials. The objective of this work is to optimize the radiochemical separation of plutonium (Pu) from soil samples and to determine their concentration. The soil samples were prepared using acid digestion assisted by microwave; purification of Pu was carried out with AG1X8 resin using ion exchange chromatography. Pu isotopes were measured using ICP-SFMS. In order to reduce the interference due to the presence of {sup 238}UH {sup +} in the samples, a solvent removal system (Apex) was used. In addition, the limit of detection and quantification of Pu was determined. It was found that the recovery efficiency of Pu in soil samples ranges from 70 to 93%. (Author)

  8. Determination of electrodebiles parameters of quark b; Determinacion de los parametros electrodebiles del quark b

    Energy Technology Data Exchange (ETDEWEB)

    Chamizo Llatas, M.

    1995-07-01

    In the present work we analyze the process e{sup e{yields}}bb with the data collected during 1991 and 1992 by the Z,3 detector situated in the LEP e{sup es}torage-ring (CERN). From the measurements of the cross-sections and the charge asymmetry we determine the parameters of the b quark in the framework of the Standard Model. Finally, we parametrize the possible deviations from the model an obtain upper and lower. limits for the mass of the t quark. (Author) 23 refs.

  9. Dose determination in computed tomography; Determinacion de dosis en tomografia computada

    Energy Technology Data Exchange (ETDEWEB)

    Descamps, C.; Garrigo, E.; Venencia, D. [Fundacion Marie Curie, Instituto Privado de Radioterapia, Departamento de Fisica Medica, Obispo Oro 423, X5000BFI Cordoba (Argentina); Gonzalez, M. [Universidad Nacional de Cordoba, Facultad de Ciencias Exactas, Fisicas y Naturales, Av. Velez Sarsfield 299, Corboba (Argentina); Germanier, A., E-mail: agermani@ceprocor.uncor.edu [Ministerio de Ciencia y Tecnologia, Ceprocor, Alvarez de Arenas 230, X5004AAP Barrio Juniors, Cordoba (Argentina)

    2011-10-15

    In the last years the methodologies to determine the dose in computed tomography have been revised. In this work was realized a dosimetric study about the exploration protocols used for simulation of radiotherapy treatments. The methodology described in the Report No. 111 of the American Association of Medical Physiques on a computed tomograph of two cuts was applied. A cylindrical phantom of water was used with dimensions: 30 cm of diameter and 50 cm of longitude that simulates the absorption and dispersion conditions of a mature body of size average. The doses were determined with ionization chamber and thermoluminescent dosimetry. The results indicate that the dose information that provides the tomograph underestimates the dose between 32 and 35%.

  10. Determining biomass in biological processes; Determinacion de la biomasa en procesos biologicos

    Energy Technology Data Exchange (ETDEWEB)

    Arnaiz, C.; Isac, L.; Lebrato, J. [Universidad de Sevilla (Spain)

    2000-07-01

    Evaluation of biomass concentration is an important problem encountered in many microbial and other bioprocesses. Many direct and indirect methods have been developed using physical and biochemical techniques. In this work various methods are discussed taking into the consideration their practical importance, usefulness and constrains in application. (Author) 11 refs.

  11. Rapid determination of filamentous microorganisms in activated sludge; Determinacion rapida de microorganismos filamentosos en fangos activados

    Energy Technology Data Exchange (ETDEWEB)

    Arnaiz, C.; Jimenez, C.; Estevez, F. [Empresa Municipal de Abastecimiento y Saneamiento de Aguas de Sevilla (Spain)

    1999-07-01

    Despite many methods available biomass estimation of a bioprocess may sometimes become laborious and impracticable. Samples containing filamentous organisms, as in Wastewater Treatment Plants, present special counting difficulties. If they are abundant they may need to be estimated separately. In this work a counting method for these organisms is show. The main goal is to improve chlorination of activated sludge suffering bulking or foaming through a quantitative record of filamentous bacteria. (Author) 12 refs.

  12. Spectrophotometric determination of silica in water. Low range; Determinacion espectrofotometrica de silicio en aguas. Rango bajo

    Energy Technology Data Exchange (ETDEWEB)

    Acosta L, E. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)]. e-mail: eal@nuclear.inin.mx

    1992-07-15

    The spectrophotometric method for the determination of the silica element in water, demineralized water, raw waters, laundry waters, waters treated with ion exchange resins and sea waters is described. This method covers the determination of the silica element in the interval from 20 to 1000 {mu}g/l on 50 ml. of base sample. These limits its can be variable if the size of the used aliquot one is changed for the final determination of the silica element. (Author)

  13. Obesidad e indicadores antropométricos en una muestra de varones con Síndrome Coronario Agudo, en un Área de Salud que incluye reclusos: estudio caso-control

    Directory of Open Access Journals (Sweden)

    A. Martín-Castellanos

    2015-06-01

    Full Text Available Objetivos: la obesidad es un factor de riesgo cardiovascular con alta prevalencia, y relacionado con la cardiopatia isquemica. El objetivo fue analizar mediante antropometria, una muestra de varones con Síndrome Coronario Agudo (SCA diagnosticado en un hospital de referencia penitenciaria, y un grupo control. Material y método: estudio caso-control en un Área de Salud que integraba a un Centro Penitenciario. Los participantes fueron 204 varones, 102 infartados y un control por cada caso. Se midió peso, talla, cintura minima (CC, cintura umbilical (CU y cadera. Se calcularon el IMC y otros indicadores. Se realizo un análisis descriptivo y se obtuvieron las áreas bajo la curva (ABC "receiver operating characteristich", las odds ratio (OR, y las correlaciones en SCA. Resultados: la obesidad presentó mayor prevalencia en SCA (31,4% vs 9,1%; OR: 4,7, otros indicadores mostraron asociación discriminatoria: IMC (ABC: 0,699; OR: 3,9, CC (ABC: 0,750; OR: 6,3, CU (ABC: 0,777; OR: 10, talla inversa (ABC: 0,619; OR: 2,1, índice cintura/cadera (ABC: 0,832; OR: 11,6; índice CU/cadera (ABC: 0,857; OR: 15,6, índice CU/talla (ABC: 0,800; OR: 8,9. Las correlaciones entre las cinturas y los índices cintura-talla fueron fuertes (todas r >0,90; p <0,001. Discusión: los indicadores antropométricos de obesidad están asociados al SCA. La CU es la medida simple más asociada. El IMC presenta una asociación débil; el índice CU/talla presenta alto poder discriminatorio y la mejor correlación antropométrica de riesgo, apoyando su uso en la identificación de varones con riesgo de infarto de miocardio tanto en la población general como penitenciaria.

  14. Assessment and epidemiology of Chagas' disease in patients treated in Araguaina - Tocantins; Avaliacao e epidemiologia da cardiopatia chagasica em pacientes atendidos em Araguaina - Tocantins

    Energy Technology Data Exchange (ETDEWEB)

    Correa, Valeria Rita

    2010-07-01

    Chagas disease (AD) was described by Carlos Chagas in 1909. It is caused by a parasite T. cruzi, transmitted by bugs, by blood transfusion, vertical and orally. The DC has two phases: acute and chronic. The evolution to the cardiac form occurs in about 30% of chronic cases and is the largest cause of mortality in chronic Chagas disease. The aim of this study was to Chagas' disease in patients of Tocantins, compared with other heart patients and asymptomatic from the standpoint of non-invasive exams using radiant energies such as echocardiography and ECG and RX. The descriptive study included 80 patients, 20 chronic form of Chagas disease, 20 indeterminate, 20 with other heart diseases, and 20 controls. There was a prevalence of 9.5% of chagasic patients treated in outpatient cardiology at Araguaina Tocantins, and 7.3% in chronic and 2.21% in the indeterminate. Of the chronic patients in the study 50% had mega esophagus and megacolon 4 (20%). Most patients had no family history of AD, nor was a smoker or drinker. Major electrocardiographic abnormalities found refer to driving. The evaluation of ICT, the chronic chagasic showed that increased by 40% of patients, 40% had esophageal changes and 20% of patients had megacolon s. The echocardiogram was abnormal in 42%). 27% of patients had EF below 55% changed. Changes in segmental contractility and Asynchrony septum were found in 80% of chronic Chagas disease. In 80% of the patients was observed diastolic dysfunction. The valvular changes occurred in 75%. Electrocardiographic abnormalities occurred in 80% of patients with CCC, while the other heart had ECG changes. Arterial hypertension had an incidence of 45% in patients with CCC and 40% in FCI. The systolic and diastolic ventricular dysfunction was more prevalent in groups that had an abnormal ECG and arrhythmia. Observed that the group of chagasic decreased ejection fraction is correlated to a higher incidence of arrhythmias besides diastolic dysfunction and related increased atrio-left, ICT correlates with LV size and EF and LA. The abnormal ECG also are related to the dysfunction. (author)

  15. Normal behaviour of circulatory parameters during exercise. Reference values for heart rate and systemic blood pressure. The ECCIS Project data. Epidemiologia e Clinica della Cardiopatia Ischemica Silente.

    Science.gov (United States)

    Menghini, F; Dally, L; Fazzini, P F; Menotti, A; Prati, P L; Rovelli, F; Antoniucci, D; Seccareccia, F

    1995-08-01

    The study of simultaneous variations in heart rate (HR) and systemic blood pressure is of great interest in ergometric practice complementing the analysis of the ST segment by ECG. This paper examines data proceeding from 500 consecutive, normal, exercise stress tests with the aim of offering reference values on the step-by-step behaviour of HR, systolic and diastolic blood pressure (SBP, DBP) during exercise in a normal population. The sample comes from a large epidemiological study (ECCIS Project) conducted on 4842 healthy, working men, aged 40-59, which proposes to identify, by a 3 stage procedure, subjects with totally asymptomatic coronary artery disease (type I silent ischemia). A further aim of our paper is to examine the influence of some physiological variables (age, height, weight, body mass index, resting HR, SBP and DBP) on the response to effort of HR, SBP and DBP; reciprocal HR/SBP adjustment during exercise; maximal attained workload and recovery time. Due to a preliminary observation that the rate of step-by-step increase in HR and SBP is inversely related to total duration, the population was split into 4 groups according to exercise tolerance (defined by maximal attained workload) to elaborate reference values. Furthermore our data demonstrate that: 1) SBP increases more rapidly with respect to HR for older and heavier subjects; 2) Exercise tolerance is inversely related to age, baseline HR and SBP, and directly related to weight and height; 3) return to baseline conditions, during recovery, is quicker for subjects with better exercise tolerance and lower baseline HR, SBP and weight.

  16. Custo anual do manejo da cardiopatia isquêmica crônica no Brasil: perspectiva pública e privada

    Directory of Open Access Journals (Sweden)

    Ribeiro Rodrigo A.

    2005-01-01

    Full Text Available OBJETIVO: Estimar o custo anual do manejo da doença arterial coronária (DAC em valores do SUS e convênios. MÉTODOS: Estudo de coorte, incluindo pacientes ambulatoriais com DAC comprovada. Considerou-se para estimar custos diretos: consultas, exames, procedimentos, internações e medicamentos. Valores de consultas e exames foram obtidos da tabela SUS e da Lista de Procedimentos Médicos (LPM. Valores de eventos cardiovasculares foram obtidos de internações em hospital público e privado com estas classificações diagnósticas em 2002. O preço dos fármacos utilizado foi o de menor custo no mercado. RESULTADOS: Os 147 pacientes (65?12 anos, 63% homens, 69% hipertensos, 35% diabéticos e 59% com IAM prévio tiveram acompanhamento médio de 24?8 meses. O custo anual médio estimado por paciente foi de R$ 2.733,00, pelo SUS, e R$ 6.788,00, para convênios. O gasto com medicamentos ($ 1.154,00 representou 80% e 55% dos custos ambulatoriais, e 41% e 17% dos gastos totais, pelo SUS e para convênios, respectivamente. A ocorrência de evento cardiovascular teve grande impacto (R$ 4.626,00 vs. R$ 1.312,00, pelo SUS, e R$ 13.453,00 vs. R$ 1.789,00, para convênios, p<0,01. CONCLUSÃO: O custo médio anual do manejo da DAC foi elevado, sendo o tratamento farmacológico o principal determinante dos custos públicos. Essas estimativas podem subsidiar análises econômicas nesta área, sendo úteis para nortear políticas de saúde pública.

  17. PREVENCIÓN SECUNDARIA DE CARDIOPATIA ISQUÉMICA A NIVEL LIPÍDICO EN ATENCIÓN PRIMARIA ARAGON. ESTUDIO PRECIAR

    Directory of Open Access Journals (Sweden)

    A.A. Martínez Hernández

    2001-01-01

    Full Text Available Fundamento: A pesar de la evidencia existente sobre la eficacia de la prevención secundaria, modificando los estilos de vida o utilizando los diversos fármacos que han mostrado su beneficio clínico en pacientes coronarios, la información disponible sobre el manejo terapéutico de estos pacientes en el ámbito de la atención primaria en nuestro país es escasa y poco precisa. El objetivo de este estudio es conocer el estado de la prevención secundaria de la enfermedad coronaria desde el punto de vista del control de los lípidos. Métodos: Se revisaron las historias clínicas de todas las personas diagnosticadas en algún momento de su vida de patología cardiovascular isquémica; incluyéndose en este apartado el infarto agudo de miocardio y el ángor, dentro de 11 cupos de 3 Centros de Salud urbanos del área II de Zaragoza. La población global era de 19.692 pacientes, encontrándose 388 casos de cardiopatía isquémica, de los datos recogidos de las historias. Resultados: Estudiando los datos sobre el control lipídico, el 60.8% de los casos analizados en este estudio presentaba un perfil lipídico completo en el último año. De estos 236 pacientes solamente el 4,7% tenía el LDL < 100, teniendo que limitar a un c-LDL < 130 el objetivo de control para encontrar un 31,3% de pacientes con un control subóptimo de este parámetro. Conclusiones: Los resultados de nuestro estudio revelan que el diagnóstico de las dislipemias, así como el control del resto de factores de riesgo cardiovascular en prevención secundaria no se han adecuado en gran medida a los criterios de calidad de este proceso asistencial y señalan, en consecuencia, la existencia de un amplio margen de mejora.

  18. Competências do enfermeiro na promoção da saúde de indivíduos com cardiopatias crônicas

    Directory of Open Access Journals (Sweden)

    Virna Ribeiro Feitosa Cestari

    Full Text Available RESUMO Objetivo: identificar as competências do enfermeiro relacionadas à promoção da saúde de indivíduos com cardiopatas crônicas, à luz do Consenso de Galway. Método: revisão integrativa da literatura, com busca de artigos publicados entre os anos de 2010 e 2014, nas bases de dados LILACS, BDENF, IBECS; e no portal PubMed, em fevereiro de 2015. Os 21 artigos selecionados foram analisados de acordo com os oito domínios de competências: Catalisar mudanças, Liderança, Avaliação das necessidades, Planejamento, Implementação, Avaliação do impacto, Defesa de direitos e Parcerias. Resultados: todos os domínios de competências foram contemplados nas intervenções do enfermeiro na promoção da saúde de cardiopatas crônicos, sendo o Planejamento e a Avaliação os mais evidenciados. Conclusão: os resultados desta pesquisa destacaram o enfermeiro como agente capaz de operar a gestão do cuidado, com vistas a melhorar articulação deste último com o trabalho e educação e, desta maneira, a assistência à saúde da população.

  19. Factors de risc emergents en cardiopatia isquèmica. Paper dels marcadors d'oxidació lipídica

    OpenAIRE

    Gómez Pérez, Miquel

    2014-01-01

    1. Gómez M, Valle V, Arós F, Sanz G, Sala J, Fiol M, Bruguera J, Elosua R, Molina L, Martí H, Covas MI, Rodríguez-Llorián A, Fitó M, Suárez-Pinilla MA, Amezaga R, Marrugat J. Ldl oxidada, lipoproteína(a) y otros factores de riesgo emergentes en el infarto agudo de miocardio (estudio Fortiam). Rev Esp Cardiol.2009; 62:373-82 (Impact Factor 2,746) (ISSN: 0300-8932) 2. Gómez M, Molina L, Bruguera J, Sala J, Masià R, Muñoz-Aguayo D, Tomás M, Heredia S, Blanchart G, Gaixas S, Vila J, Fitó M; Ox...

  20. Factors de risc emergents en cardiopatia isquèmica. Paper dels marcadors d'oxidació lipídica

    OpenAIRE

    Gómez Pérez, Miquel; Cladellas Capdevila, Mercè

    2014-01-01

    1. Gómez M, Valle V, Arós F, Sanz G, Sala J, Fiol M, Bruguera J, Elosua R, Molina L, Martí H, Covas MI, Rodríguez-Llorián A, Fitó M, Suárez-Pinilla MA, Amezaga R, Marrugat J. Ldl oxidada, lipoproteína(a) y otros factores de riesgo emergentes en el infarto agudo de miocardio (estudio Fortiam). Rev Esp Cardiol.2009; 62:373-82 (Impact Factor 2,746) (ISSN: 0300-8932) 2. Gómez M, Molina L, Bruguera J, Sala J, Masià R, Muñoz-Aguayo D, Tomás M, Heredia S, Blanchart G, Gaixas S, Vila J, Fitó M; Oxidi...

  1. Ventriculectomia parcial: um novo conceito no tratamento cirúrgico de cardiopatias em fase final Partial ventriculectomy: a new concept for surgical treatment of end stage cardiopathies

    Directory of Open Access Journals (Sweden)

    Randas J. V Batista

    1996-03-01

    Full Text Available A melhora clínica da função cardíaca pós aneurismectomia de ventrículo esquerdo e/ou cardiomioplastia com o músculo grande dorsal parece ser, ao menos parcialmente, devida ao remodelamento do ventrículo esquerdo. Através de pesquisa em nosso laboratório experimental com carneiros, demonstramos que o aumento do diâmetro do ventrículo é mais importante que a perda de massa muscular para a deterioração da função ventricular. Sabendo-se que em miocardiopatia dilatada não ocorre aumento de massa muscular, reduzimos o diâmetro do ventrículo para o normal, em uma série consecutiva de pacientes com esta lesão. No período de 1984 a 1995, foram operados com esta nova técnica, denominada, então, "Ventriculectomia Parcial", 103 pacientes portadores de miocardiopatias complexas e insuficiência cardíaca congestiva (NYHA IV. A operação é baseada na lei de Laplace (T=P.11.D e consistiu na remoção de uma fatia de músculo da parede lateral do ventrículo esquerdo, iniciando-se na ponta deste, estendendo-se entre os músculos papilares e terminando próximo ao anel mitral. A cirurgia é realizada sob circulação extracorpórea normotérmica e não se utiliza cardioplegia. "Todos os pacientes foram avaliados pré-operatoriamente com ecodopplercardiografia e ventriculografia digital, os quais revelaram fração de ejeção The clinical improvement of cardiac function post left ventricular aneurysmectomy and/or cardiomyoplasty with the latissimus dorsi muscle seems to be due to the remodeling of the left ventricle. We did some experiments with sheep in our laboratory and we concluded that the increment of ventricular diameter is more deleterious than loss of muscle mass to the ventricular function. Since there is no increment in muscle mass to the dilated hearts, we reduced their diameter to accomplish a better ventricular function in a series of very sick patients with dilated hearts. From 1984 to 1995, 103 patients with complex cardiac problems and end stage congestive heart failure (NYHA IV with dilated cardiomyopathy underwent "Partial Ventriculectomy". The operation was based on Laplace's law (T-P.II.D and consisted of removal of a large wedge of muscle from the lateral wall of the left ventricle beginning at the apex and extending between the papillary muscles, ending proximal to the mitral annulus. The operation was performed under normothermic cardiopulmonary bypass and no cardioplegia was used. Pre-operative left ventriculography and echocardiography showed global hypocontractility of the hearts with ejection fraction lower than 20% in all patients who were considered candidates for cardiac transplantation. Males were predominant (n=73 and the age varied from 19 to 74 years. The pathologies were: viral miocarditis (n=12; post miocardioplasty (n=1; Chagas' disease (n=15; valvular disease (n=38; ischemic disease (n=16; idiopathic (n=21. Hospital mortality (30 days post operative (n=13: pulmonary embolus (n=4; renal failure (n=5; bleeding (n=4. Late deaths (after 30 days post-operative (n=10: arhythmia (n=6; "cardiac failure" (n=2; unknown (n=2; 8 patients required reoperation for bleeding. There were no infection and none required IAPB. All patients had nipride and 19 needed inotropics. Post-op ventriculographies and echocardiographies showed improvement of EF (from 100% to 300%. In conclusion, this new technique "Partial Ventriculectomy", with it's purpose of reducing the ventricular diameter, may benefit patients with end stage heart failure. And this new concept may, in our experience, give the patient improvement in his clinical status and increase life span.

  2. Relação entre Fibrose e Arritmias Ventriculares na Cardiopatia Chagásica sem Disfunção Ventricular

    Directory of Open Access Journals (Sweden)

    Eduardo Marinho Tassi

    2014-06-01

    Full Text Available Fundamento: Pacientes com doença de Chagas com alteração segmentar apresentam pior prognóstico independentemente da fração de ejeção ventricular esquerda. A ressonância magnética cardíaca é atualmente o melhor método para detecção de alteração segmentar e para avaliação de fibrose miocárdica. Objetivo: Quantificar a fibrose, por meio do realce tardio, pela ressonância magnética cardíaca, em pacientes com doença de Chagas com fração de ejeção ventricular esquerda preservada ou minimamente comprometida (> 45% e detectar padrões de dependência entre fibrose, alteração segmentar e fração de ejeção ventricular esquerda na presença de arritmia ventricular. Métodos: Foram realizados eletrocardiograma, teste ergométrico, Holter e ressonância magnética cardíaca em 61 pacientes, separados em três grupos: (1 eletrocardiograma normal e ressonância magnética cardíaca sem alteração segmentar; (2 eletrocardiograma alterado e ressonância magnética cardíaca sem alteração segmentar; e (3 ressonância magnética cardíaca com alteração segmentar independentemente de alteração no eletrocardiograma. Resultados: O número de pacientes com arritmia ventricular em relação ao número total de pacientes em cada grupo, a porcentagem de fibrose e a fração de ejeção ventricular esquerda foram, respectivamente: no primeiro grupo, 4/26, 0,74% e 74,34%; no segundo grupo, 4/16, 3,96% e 68,5%; e no terceiro grupo, 11/19, 14,07% e 55,59%. Arritmia ventricular foi encontrada em 31,1% dos pacientes. Aqueles com e sem arritmia ventricular apresentaram fração de ejeção ventricular esquerda média de 59,87% e 70,18%, respectivamente, e fibrose de 11,03% e 3,01%, respectivamente. Das variáveis alteração segmentar, grupos, idade, fração de ejeção ventricular esquerda e fibrose, a última foi a única significativa para a presença de arritmia ventricular, com ponto de corte de 11,78% para massa fibrosada (p < 0,001. Conclusão: Mesmo em pacientes com doença de Chagas com fração de ejeção ventricular esquerda preservada ou minimamente comprometida, a instabilidade elétrica pode estar presente. Fibrose é a variável mais importante para a presença de arritmia ventricular, sendo sua quantidade proporcional à complexidade dos grupos.

  3. Transplante de células mesenquimais de tecido adiposo na cardiopatia chagásica crônica experimental

    Directory of Open Access Journals (Sweden)

    Ticiana Ferreira Larocca

    2013-05-01

    Full Text Available FUNDAMENTO: A doença de Chagas, causada pelo protozoário Trypanosoma cruzi, é uma das mais importantes causas de insuficiência cardíaca na América Latina. A terapia celular vem sendo investigada como uma possível opção terapêutica para pacientes com doenças cardiovasculares. OBJETIVO: O objetivo deste estudo foi avaliar os efeitos da terapia com células-tronco mesenquimais em um modelo experimental de cardiomiopatia chagásica crônica. MÉTODOS: Camundongos C57BL/6 foram infectados com 1000 tripomastigotas da cepa Colombiana de T. cruzi e, após seis meses de infecção, foram tratados com células-tronco mesenquimais derivadas de tecido adiposo humano (CTTAs ou com meio DMEM (controle. O grupo tratado recebeu duas injeções intraperitoneais de CTTAs (1x106 células / dose, com um mês de intervalo entre as duas doses. Antes e após 1 e 2 meses de tratamento, os animais chagásicos e controles normais foram submetidos à eletrocardiograma e teste ergoespirométrico. Todos os animais foram sacrificados sob anestesia após 2 meses de tratamento, para análise histopatológica do coração. RESULTADOS: Não foi observada melhora de arritmias e da função cardiovascular no grupo tratado com CTTAs, porém secções de corações de camundongos deste grupo apresentaram uma redução significativa do número de células inflamatórias (p < 0,0001 e da área de fibrose (p < 0,01 em comparação com animais chagásicos tratados com DMEM. CONCLUSÃO: Deste modo, conclui-se que a administração de CTTAs por via intraperitoneal é capaz de reduzir inflamação e fibrose no coração de camundongos cronicamente infectados por T. cruzi, porém não teve efeitos na função cardíaca dois meses após o transplante.

  4. Determination of carbon in uranium and its compounds; Determinacion de carbono en uranio metal y sus compuestos

    Energy Technology Data Exchange (ETDEWEB)

    Perez-Garcia, M. M.

    1972-07-01

    This paper collects the analytical methods used our laboratories for the determination of carbon in uranium metal, uranate salts and the oxides, fluorides and carbides of uranium. The carbon is usually burned off in a induction or resistance oven under oxygen flow. The CO{sub 2} is collected in barite solution. Where it is backtitrated with potassium biphthalate. (Author)

  5. Photostability Assessment in Amorphous-Silicon Solar Cells; Determinacion de la Fotoestabilidad en Celulas Solares de Silicio Amorfo

    Energy Technology Data Exchange (ETDEWEB)

    Gandia, J. J.; Carabe, J.; Fabero, F.; Jimenez, R.; Rivero, J. M. [Ciemat, Madrid (Spain)

    2000-07-01

    The present status of amorphous-silicon-solar-cell research and development at CIEMAT requires the possibility to characterise the devices prepared from the point of view of their stability against sunlight exposure. Therefore a set of tools providing such a capacity has been developed. Together with an introduction to photovoltaic applications of amorphous silicon and to the photodegradation problem, the present work describes the process of setting up these tools. An indoor controlled-photodegradation facility has been designed and built, and a procedure has been developed for the measurement of J-V characteristics in well established conditions. This method is suitable for a kinds of solar cells, even for those for which no model is still available. The photodegradation and characterisation of some cells has allowed to validate both the new testing facility and method. (Author) 14 refs.

  6. Determination of {sup 60}Co sorption in natural clinoptilolite; Determinacion de la sorcion de {sup 60}Co en clinoptilolita natural

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez B, E.; Granados C, F. [Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    1997-07-01

    It was studied the clinoptilolite behavior coming from a deposit in Taxco, Guerrero in hydration and stabilization conditions with sodium for determining its sorption properties. The ion exchange process was carried out through gamma spectrometry using a CoCl{sub 2} solution marked with {sup 60} Co at p H 6.5 in different contact times. It was observed a maximum sorption of 0.408 m eq Co{sup +2}/g mineral, from 0.314 m eq Co{sup +2}/g mineral correspond at ion exchange. (Author)

  7. Determinants of labor safety management in Spanish companies; Determinacion de la gestion de la seguridad laboral en las empresas espanolas

    Energy Technology Data Exchange (ETDEWEB)

    Fernandez Muniz, B.; Montes Peon, J. M.; Vazquez Ordas, C. J.

    2011-07-01

    Managing health and safety risks in an integrated way with the operations of the organization has been of increasing importance in recent years. This approach reduces accident rates, reducing losses and improves the firm's productivity. However, very little attention has been paid to analyse the organizational factors that favour or limit the implementation of the safety management system in firms. In an attempt to address this gap in the literature, the present study focuses on the identification of the characteristics of the organization that encourage the development of this system. The results show that several factors, as firm's size, previous experience on quality and environmental management or internationalisation, among others, have a positive influence on safety management system. (Author) 62 refs.

  8. Determinaciones de parámetros de diseño para lagunas de alta velocidad con residuales pesqueros

    OpenAIRE

    Teresita de Jesús Romero López; Celia Rodríguez Pérez de Agreda

    2006-01-01

    Debido a la necesidad de conservar el medio ambiente circundante y muy especialmente las aguas interiores y costeras, se estudian diferentes sistemas de tratamiento de las aguas de desecho para su aplicación en instalaciones que carezcan de ellas. En el caso muy especial de la industria pesquera, donde solamente 14 establecimientos poseen tratamiento de los 42 activos hasta la fecha, se requiere del estudio y rápida puesta en marcha de alternativas que logren disminuir la carga contaminante h...

  9. Quantitative spectrographic determination of traces of manganese in ferric oxide; Determinacion espectrografica cuantitativa de trazas de manganeso en oxido ferrico

    Energy Technology Data Exchange (ETDEWEB)

    Capdevila, C.; Roca, M.

    1968-07-01

    In order to enhance the sensitivity, different electrode types and sweeping substances have been studied. Graphite anodes, with 5 x 2,5, 4 x 4,5, 4 x 8 and 7 x 10 mm crater, as well as CuF{sub 2}, AgCl, ZnO and graphite powder as sweeping materials, have been tested. A JACO-Ebert grating spectrograph and 10 amp. d.c. arc have been employed, choosing the proper exposure times from moving-plate studies. Using 4 x 4,5 mm electrodes and 75% AgCl a detection limit of 0,2 ppm is attainable. (Author) 7 refs.

  10. Plutonium determination in urine by techniques of mass spectrometry; Determinacion de plutonio en orina por tecnicas de espectrometria de masas

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez M, H. [ININ, Departamento de Quimica, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico); Yllera de Ll, A., E-mail: hector.hernandez520@gmail.com [Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas, Departamento de Medio Ambiente, Av. Complutense 22, 28040 Madrid (Spain)

    2013-10-15

    The objective of this study was to develop an analytic method for quantification and plutonium reappraisal in plane tables of alpha spectrometry be means of the mass spectrometry technique of high resolution with plasma source inductively coupled and desolvator Aridus (Aridus-Hr-Icp-Ms) and mass spectrometry with accelerator (AMS). The obtained results were, the recovery percentage of Pu in the plane table was of ∼ 90% and activity minimum detectable obtained with Aridus-Hr-Icp-Ms and AMS was of ∼ 3 and ∼ 0.4 f g of {sup 239}Pu, respectively. Conclusion, the results demonstrate the aptitude of the Aridus-Hr-Icp-Ms and AMS techniques in the Pu reappraisal in plane tables with bigger speed and precision, improving the values notably of the activity minimum detectable that can be obtained with the alpha spectrometry (∼ 50 f g of {sup 239}Pu). (author)

  11. Determination of thermal neutrons diffusion length in graphite; Determinacion de la Longitud de Difusion de los Neutrones Termicos en Grafito

    Energy Technology Data Exchange (ETDEWEB)

    Garcia Fite, J.

    1959-07-01

    The diffusion length of thermal neutrons in graphite using the less possible quantity of material has been determined. The proceeding used was the measurement in a graphite pile which has a punctual source of rapid neutrons inside surrounded by a reflector medium (paraffin or water). The measurement was done in the following conditions: a) introducing an aluminium plate between both materials. b) Introducing a cadmium plate between both materials. (Author) 91 refs.

  12. Element determination of fine particles in environmental aerosols using PIXE; Determinacion elemental de paticulas finas en aerosoles ambientales usando PIXE

    Energy Technology Data Exchange (ETDEWEB)

    Garcia O, B. [ITT, 50000 Toluca (Mexico); Aldape U, F. [ININ, 52750 La Marquesa, Estado de Mexico (Mexico)]. e-mail: gaolivab@gmail.com

    2007-07-01

    The Mexico city is classified as one of the more populated cities of the world which presents a decrease in the air quality and that gives place to a severe problematic in atmospheric pollution. To cooperate in the solution of this problem it is necessary to carry out studies that allow a better knowledge of the atmosphere of the city. This study presents the results of a monitoring campaign of fine particle carried out from September 21 to December 12, 2001 in three sites of the Mexico City center area. The samples were collected every third day with a collector type unit of heaped filters (Gent). The analysis of these samples was carried out in the 2 MV accelerator of the National Institute of Nuclear Research (ININ) applying the PIXE technique and with this analysis its were identified in the samples approximately 15 elements in each one of the 3 sites and was calculated the concentration in that its were present. With these results a database was created and by means of it mathematical treatment the Enrichment factor (FE), the time series of each element and the multiple correlation matrix were evaluated. The obtained results showed that the Civil Registration site (Salto del Agua) it was the more polluted coinciding that to a bigger concentration of activities a bigger increase in the pollution is generated. (Author)

  13. Anaerobic digestion of vinasses: determination of biomass; Digestion anaerobia de vinazas de vino: determinacion de la biomasa viable

    Energy Technology Data Exchange (ETDEWEB)

    Solera, R.; Romero, L.; Salles, D.

    2002-07-01

    In this paper, we studied the thermophilic anaerobic treatment of vinasses. The viable bacterial population was quantified by soil medium plating techniques, employing an anaerobic chamber for spreading into plates and subsequent incubation of inoculated plates. This technique has been applied to the measurement of the microbial population contained in both single and tow-stage, laboratory-scale reactors. In the single-stage process the main reaction steps-acidogenesis and methano genesis-take place in the same reactor, while in the two-stage process they take place in separate reactors. (Author) 11 refs.

  14. Determinaciones de Parámetros de Diseño para Lagunas de Alta Velocidad con Residuales Pesqueros.

    Directory of Open Access Journals (Sweden)

    Teresita de Jesús Romero López

    2005-01-01

    Full Text Available Debido a la necesidad de conservar el medio ambiente circundante y muy especialmente las aguas interiores y costeras, se estudian diferentes sistemas de tratamiento de las aguas de desecho para su aplicación en instalaciones que carezcan de ellas. En el caso muy especial de la industria pesquera, donde solamente 14 establecimientos poseen tratamiento de los 42 activos hasta la fecha, se requiere del estudio y rápida puesta en marcha de alternativas que logren disminuir la carga contaminante hasta valores permisibles. Por tales motivos, además del estudio que se realizó a diferentes escalados para explorar y proponer un sistema de tratamiento por laguna de alta velocidad con microalgas del género Chlorella, se calcularon ecuaciones tanto empíricas como cinéticas a partir de los valores de Demanda Bioquímica de Oxígeno (DBO, con el objetivo de facilitar la predicción de la eficiencia del sistema en sí, así como su diseño. Para el cálculo de las ecuaciones empíricas se tuvieron en consideración las cargas orgánicas superficiales aplicadas y removidas (COa y COr y las cargas orgánicas volumétricas aplicadas y removidas (COva y COvr. Por otra parte, se comprobó que la ecuación de primer orden para un sistema en batch se ajusta al proceso depurador que ocurre en los mismos, siendo el valor promedio obtenido para la constante cinética del proceso 0,47 d¿1. Los resultados logrados en este estudio demuestran las grandes posibilidades que tienen las lagunas de alta velocidad para el tratamiento de las aguas residuales de la industria pesquera cubana, además de aportar una herramienta de gran valor para su diseño.

  15. Structural determination of some uranyl compounds by vibrational spectroscopy; Determinacion estructural de algunos compuestos de uranilo por espectroscopia vibracional

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez S, A.; Martinez Q, E

    1990-07-15

    The vibrational spectra of different uranyl compounds has been studied and of it spectral information has been used the fundamental asymmetric vibrational frequency, to determine the length and constant bond force U=O by means of the combination of the concept of absorbed energy and the mathematical expression of Badger modified by Jones. It is intended a factor that simplifies the mathematical treatment and the results are compared with the values obtained for other methods. (Author)

  16. Spectrographic determination of strontium in yttrium-90 solutions; Determinacion espectrografica de estroncio en soluciones de itrio-90

    Energy Technology Data Exchange (ETDEWEB)

    Roca, M.; Capdevila, C.

    1970-07-01

    The copper spark method has been used for determining strontium in the concentration range 1-100 g/ml in yttrium-90 solutions containing 0,5 % or thereabouts of ammonium citrate. The influence of the citric acid as well as the ammonium citrate with regard to 2N HCL solutions has been studied: the citric acid enhances the line intensities of strontium. The employment of either barium or lanthanum as reference element compensates for this enhancement. Because of the increase in sensitivity mentioned above, the study of influence of the citric acid has been extended and several impurities usually determined in radioisotope solutions have been considered. (Author) 4 refs.

  17. Determination of elasticity module for deep clays formations; Determinacion del modulo de elasticidad de formaciones arcillosas profundas

    Energy Technology Data Exchange (ETDEWEB)

    Celada Tamames, B.; Galera Fernandez, J.M.; Rodriguez Soto, A. [Geocontrol, S.A. Madrid (Spain); Varona Eraso, P. [Itasca Consulting Group, Minneapolis (Spain)

    1995-07-01

    This report summarizes the work in order to know the elasticity module of deep clays. The study is supported on numerical data, laboratory testing and in situ testing. To measure the deformation of clays drilling of more than 300 m. were made.

  18. Volatile organic compound (VOC) determination in working atmospheres; Determinacion de compuestos organicos volatiles (VOC) en ambiente laboral

    Energy Technology Data Exchange (ETDEWEB)

    Blass A, Georgina; Panama T, Luz A; Corrales C, Deyanira [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2003-07-01

    The present work describes, in a synthesized way, the implementation and application of procedures based on the normativity related to the subject of the volatile organic compounds (Volatile Organic Compounds VOC), that allow to sample, quantify and evaluate the present contamination in the working atmosphere of a refinery due to the fugitive emissions of VOC and other substances. In accordance with the corresponding normativity, more than 189 organic compounds denominated dangerous air polluting agents (Hazardous Air Pollutants, HAP) can be found in a working atmosphere, but they are the 11 main HAP that can be found in a refinery. In the present article the work made for the sampling and quantification of 5 of the 11 dangerous polluting agents of the air: benzene, toluene, xylene, iso-octane and naphthalene. [Spanish] El presente trabajo describe, de manera sintetizada, la implementacion y aplicacion de procedimientos basados en la normatividad relacionada al tema de los compuestos organicos volatiles (Volatil Organic Compounds, VOC), que permiten muestrear, cuantificar y evaluar la contaminacion presente en el ambiente laboral de una refineria debido a las emisiones fugitivas de VOC y otras sustancias. De acuerdo con la normatividad correspondiente, mas de 189 compuestos organicos denominados contaminantes peligrosos del aire (Hazardous Air Pollutants, HAP), pueden ser encontrados en un ambiente laboral, pero son 11 los principales HAP que pueden ser hallados en una refineria. En el presente articulo se informa el trabajo realizado para el muestreo y cuantificacion de 5 de los 11 contaminantes peligrosos del aire: benceno, tolueno, xileno, iso-octano y naftaleno.

  19. Quantitative spectrographic determination of traces of germanium in lignite; Determinacion Espectrografica Cuantitativa de trazas de Germanio en Lignitos

    Energy Technology Data Exchange (ETDEWEB)

    Martin, M.; Roca, M.

    1972-07-01

    A burning technique in a d.c. arc at 10 amp has been employed. The standards have been prepared from a natural lignite with a low germanium content. In order to enhance sensitivity, AgCl, K{sub 2}SO{sub 4}, CuF{sub 2}, Sb{sub 2}S{sub 3} and Bi{sub 2}S{sub 3} have been tested as sweeping materials. Using 2% CuF{sub 2} a detection limit of 1 ppm germanium is attainable. Bi, Cu, Sb and Sn have been studied as internal standards: the former leads to the, highest precision (1 6%). Results show good agreement with those obtained by the addition method. (Author) 6 refs.

  20. METODOLOGIAS ANALITICAS PARA LA DETERMINACION DE ANTIMONIO TOTAL EN SUELOS Y VEGETALES Y PARA SU ESPECIACION REDOX EN SUELOS.

    OpenAIRE

    FUENTES PEREZ, EDWAR

    2002-01-01

    Este trabajo presenta la optimización de metodologías analíticas destinadas a la determinación de antimonio total en muestras ambientales sólidas de suelos y vegetales. Estas metodologías incluyeron como técnicas de cuantificación la espectroscopia de abs 216p.

  1. DETERMINACION DEL POTENCIAL DE LA ZONA DE VILCABAMBA SECTOR PINTOBAMBA – CHOQEZAFRA, COMO AREA NATURAL PROTEGIDA CUSCO - 2008

    OpenAIRE

    CANDIA GOMEZ, ALFREDO

    2015-01-01

    LAS ÁREAS NATURALES PROTEGIDAS CÓMO SE CREARON CUÁNTAS ÁREAS EXISTEN QUÉ ES UN ÁREA NATURAL PROTEGIDA PARA QUÉ SE CREA UN ÁREA NATURAL PROTEGIDA NIVELES DE ADMINISTRACIÓN DE LAS ÁREAS NATURALES PROTEGIDAS CLASES DE ÁREAS NATURALES PROTEGIDAS INSTRUMENTOS QUE SE UTILIZAN PARA EL MANEJO DE ÁREAS NATURALES PROTEGIDAS CATEGORÍAS ESPECÍFICAS DE ÁREAS QUE EXISTEN ZONIFICACIÓN DE UNA ÁREA NATURAL PROTEGIDA INSTRUMENTOS DE PLANIFICACIÓN USOS PARA LA GESTIÓN DEL ÁREA NATURAL PROTEGIDA SISTEMA NACIONAL...

  2. Determination of cyanobacteria toxins (microcystins): current situation; Problematica y situacion actual de la determinacion de toxinas de cianobacterias: microcistinas

    Energy Technology Data Exchange (ETDEWEB)

    Moreno Navarro, I. M.; Pichardo Sanchez, S.; Carmean Fernandez, A. M. [Universidad de Sevilla (Spain)

    2003-07-01

    A review of the different biological and chemical methods developed to determine cyano bacterial toxins, microcystins (MC), in freshwater has been carried out. However, any of them have been accepted as a standard method by the official environmental agencies. Biological methods as the mouse bioassays, immunoassays or protein phosphatase, inhibition assays are used as screening methods to detect MC. Analytical methods as High Performance Liquid Chromatography (HPLC) or Capillary Electrophoresis (CE), with different detectors, allow to identify and quantify the individual toxins produced by different cyano bacterial species. (Author) 40 refs.

  3. Determination of radon levels in Mexico City; Determinacion de niveles de radon en la Ciudad de Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Pena G, P

    1992-01-15

    The study of the determination of radon levels in the houses room in Mexico City is part of the project Emanometry of the radon. To carry out this study, the passive method was used, which consists of: thin film dosemeter of cellulose nitrate, container of the same one and spark accountant. The method is based on the mensurations of exhibition of the number of marks of alpha track is of the open type and it allows to average the radon activity along several weeks and it presents low concentrations. This study was carried out in 4 periods of exhibition of 3 months each one. (Author)

  4. Escalas y determinaciones en la reforma a la propiedad de los energéticos: México

    Directory of Open Access Journals (Sweden)

    Luis Alberto Luna Gómez

    2016-02-01

    Full Text Available La reforma energética aprobada el año 2013 en México es parte de la política de posicionamiento global del Estado Nacional de Competencia para atraer la inversión de capitales nacionales y extranjeros, siendo no sólo promotor, sino socio de dichos capitales. Esta acción determina la producción del territorio en diferentes escalas, aquí se expone la global y local. El método de investigación deductivo se basa en el análisis del fenómeno a partir del bagaje conceptual desarrollado por la geografía crítica, teniendo como foco de atención la estructura como determinante de la acción. La presente investigación se centra en las transformaciones espaciales provocadas en México por la reforma energética. Las transformaciones espaciales se derivaron del espacio concebido a partir de la representación y especulación, con la finalidad de acumular la máxima ganancia. En dicha acción se relacionan diferentes actores sociales. Dichos actores conducen sus propósitos de forma conciente o inconciente en fases subsecuentes de acumulación que se enmarcan, espacial y temporalmente en el Estado Nacional de Competencia el cual busca promover la estacionalidad del capital financiero dentro de sus fronteras, basado en la política de posicionamiento.

  5. Determination of {sup 40}K in water samples; Determinacion del {sup 40}K en muestras de agua

    Energy Technology Data Exchange (ETDEWEB)

    Delgado, C. E.; Miranda C, L.; Cuevas J, A. K.; Vega C, H. R., E-mail: rmfranccesco0223@hotmail.com [Universidad Autonoma de Zacatecas, Unidad Academica de Estudios Nucleares, Cipres No. 10, Fracc. La Penuela, 98068 Zacatecas (Mexico)

    2014-10-15

    The natural water used for human consumption comes from different sources, which may contain suspended solids in varying proportions. In groundwater, the source of suspended solids is related to the dissolution of mineral strata by the waters and leaching of rocks. Also, the radioactivity could concentrate on the bodies of slow-moving water that eventually could present a risk to ecosystems, as well as for the consumer. The water usually contains several natural radionuclides as: tritium, radon, radio, uranium isotopes, etc. The objective of this study was to evaluate the concentration of {sup 40}K in water from different areas of Zacatecas state (Mexico). Four water samples were taken in triplicate from different areas; the {sup 40}K concentration was measured with a spectrum metric system of gamma radiation with NaI (Tl) scintillation detector of 7.62 cm. In the measuring process a standard was prepared using water and KCl analytic grade where the {sup 40}K concentration is 6.25 mol/Lt adding 250 mg/ml of potassium. Also the system was calibrated in energy using 3 point sources of {sup 137}Cs, diameter {sup 22}Na and 7.62 cm of height, using containers Marinelli and {sup 60}Co. In the obtained spectra was observed that the photon of 1.432 MeV that emits the {sup 40}K when decaying is the most important. The highest concentration was of 123 ± 5.2 Bq/lt and the lowest was of 9 ± 0.4 Bq/lt. Under the standards of drinking water, an amount of {sup 40}K deposits an effective dose which contributes to annual dose received by people. (Author)

  6. Determination of degradation conditions of exchange resins containing technetium; Determinacion de condiciones de degradacion de resinas de intercambio conteniendo tecnecio

    Energy Technology Data Exchange (ETDEWEB)

    Rivera S, A.; Monroy G, F.; Quintero P, E., E-mail: aa_1190@hotmail.com [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico)

    2014-10-15

    The quantification of Tc-99 in spent exchange resins, coming from nuclear power plants, is indispensable to define their administration. The Tc-99 is a pure beta emitter of 210000 years of half-life, volatile and of a high mobility in water and soil. For this reason, the objective of this work is to establish a digestion method of ionic exchange resins containing technetium that retains more than 95% of this radioisotope. Mineralization tests were carried out of a resin Amberlite IRN-150 by means of an oxidation heat, in acid medium, varying the resin mass, the medium volume, the media type, the temperature and the digestion time. The digested samples were analyzed by gas chromatography to estimate the grade of their degradation. The {sup 99m}Tc was used as tracer to determine the technetium percentage recovered after mineralizing the resin. The digestion process depends on the temperature and the resin mass. At higher temperature better mineralization of samples and to greater resin mass to a constant temperature, less degradation of the resin. The spectra beta of the {sup 99m}Tc and {sup 99}Tc are presented. (Author)

  7. Uranium potentiometer determination in inactive atmosphere with ferric sulfate; Determinacion poteniometrica de uranio en atmosfera inerte con sulfato ferrico

    Energy Technology Data Exchange (ETDEWEB)

    Fernandez Cellini, R.; Alonso Lopez, J.

    1956-07-01

    Potentiometric titration of Uranium with (SO{sub 4}){sub 3} Fe{sub 2}, using Cd as reducing agent has been studied; acidity and sensibility of this reaction are fixed. This method yields good results for uranite group, removing previously phosphate by ion exchange with Amberlite IR-120. (Author)

  8. Determinacion de las relaciones polimorficas entre Teladorsagia circumcincta (Stadelmann, 1894 y Teladorsagia trifurcata (Ransom, 1907 en condiciones experimentales

    Directory of Open Access Journals (Sweden)

    G. Morales

    1985-03-01

    Full Text Available En el presente estudio se demostró que Teladorsagia circumcincta (Stadelmann, 1894 y T. trifurcata (Ransom, 1907, nemátodes Trichostrongylidae de la sub-família Ostertagiinae, parasitan un espectro de hospedadores similares. La ausencia de barreras reproductivas entre T. trifurcata y T. circumcincta, así como la estabilización rápida de las proporciones de las dos entidades en el seno de la población, evidencia que T. trifurcata es un morfo de T. circumcincta.It is shown in this study that two species of nematodes: Teladorsagia circumcincta (Stadelmann, 1894 and T. trifurcata (Ransom, 1907, (Nemátoda, Trichostrongylidae, subfamily Ostertagiinae, have a similar range of host species. Furthermore, the abscence of reproductive barriers, as well as the fact that both forms soon reach stable proportions in the host population, indicate that T. trifurcata is a morph of T. circumcincta.

  9. Spectrographic determination of impurities in enriched uranium solutions; Determinacion espectrografica de impurezas en soluciones de uranio enriquecido

    Energy Technology Data Exchange (ETDEWEB)

    Capdevila, C.; Roca, M.

    1980-07-01

    A spectrographic procedure for the determination of trace amounts of Al, B, Ba, Be, Bi, Ca, Cd, Co, Cr, Cu, Fe, K, L i , Hg, Mn, Mo, Na, Nb, Ni, P, Pb, Ru, Sb, Sn, Sr, Ti, V, Zn, and Zr in enriched uranyl nitrate solutions from the reprocessing of spent nuclear fuels is described. After removal of uranium by either TBP or TNOA solvent extraction, the aqueous phase Is analysed by the graphite spark technique. TBP is adequate for all impurities, excepting boron and phosphorus; both of these elements can sat is factory be determined by using TNOA after the addition of mannitol to avoid boron losses. (Author) 4 refs.

  10. Determining biomass in biological processes. Methods for wastewater biological treatment; Determinacion de la biomasa en procesos biologicos

    Energy Technology Data Exchange (ETDEWEB)

    Arnaiz, C.; Isaac, L.; Lebrato, J. [Universidad Politecnica de Sevilla (Spain)

    2000-07-01

    Biomass concentration and activity are two important parameters for the successful design and control of biological processes in wastewater treatment. Widely used parameter for biomass characterization is dry weight concentration. This parameter is, however, not sufficient to describe biomass activity. Improved analytical methods are needed in order to understand the physiological behaviour of the biomass. In this work, conventional and advanced analytical methods for biomass determination in wastewater treatment are reviewed. (Author) 27 refs.

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

    Energy Technology Data Exchange (ETDEWEB)

    Garcia Castrejon, Juan Carlos

    2008-09-15

    The steam flow induced vibrations in turbines is a common problem during the operation of 300 MW turbines and it is one of the problems that requires solution to develop 1 GW steam turbines. The flow induced vibration is caused because there is an interaction between blades and the flow field. Blades are subjected to the forces caused by the flow field, but also the flow field is affected by the blades and its movement. The nozzle wakes cause uneven pressure field downstream and produces alternating forces on blades which lead to blade vibrations. Some of the vibrations originated in this way may damage the blades and affect the turbine performance. The forces acting on blades (and causing forced vibrations) as a result of the variations in the flow field in the axial rotor-stator clearance are studied in this project. These forces were determined applying computer fluid dynamics (CFD) in two turbine stages. The CFD analysis was carried out in the Curtis stage and in the last stage, using 2D and 3D models. An important part of the analysis is focused on discussing the pressure field variation, because this variation caused the forces acting on blades. The flow field was resolved using CFD and the computed pressure field was integrated around the blades to get the forces acting on blades. These computed dynamical forces were analyzed using a FFT analysis and the results were used in the blade useful life estimation and in the investigation of the failure causes of these blades. In every turbine stage the RNG - turbulence model and the sliding mesh method was used to deal with the blade motion. The 3D models were resolved using parallel computation in a cluster of 6 AMD 64 Opteron processors of 2412.36 MHz and 8 Gb of RAM. The results of the simulation in both stages get the pressure field behavior in the axial rotor-stator clearance and determine the force acting on the blades. These results showed that both, the pressure field and the force magnitude acting on blades, has a harmonic pattern. The pressure field variation as time function is uniform: the peaks and valleys across the axial clearance are always in phase. However the instant picture of the pressure field it's different: the peaks and valleys are not in phase and the number of peaks and valley changed across the clearance. In the case of the forces acting on blades, a Fourier on the forces calculated was used to determine the coefficients and frequency of a Fourier equation which can be used to calculate the alternating stresses on the blade in order to predict the useful life blades. [Spanish] Las vibraciones inducidas por flujo de vapor en turbinas representan uno de los problemas que enfrenta la operacion de turbinas de vapor cuya capacidad rebasa los 300 MW. Ademas estas constituyen uno de los limites tecnologicos para el desarrollo de turbinas de vapor de mas de 1 GW. Este tipo de fenomeno tiene su origen en la interaccion del rotor con el fluido que se encuentra en sus proximidades. El flujo de vapor dentro de la turbina es complejo, ya que es turbulento e inestable. A medida que el flujo pasa una etapa de estator o de rotor, se generan secundarios, vortices en los filos de salida, estelas con caracteristicas de flujo diferentes al flujo principal en los pasajes. Estas variaciones en el flujo son las que inducen vibraciones forzadas en los alabes. Ademas existen varios factores que contribuyen a la aplicacion de vibraciones en alabes inducidas por flujo como son: inestabilidad del flujo de vapor en los claros de los sellos, secuencia de apertura de las valvulas, estelas de las toberas, obstrucciones en algunas de las toberas y diferente espaciamiento en las toberas. Las vibraciones por flujo pueden ser peligrosas si su frecuencia coincide con la frecuencia natural del sistema, provocando efectos mas nocivos que las vibraciones por desbalance o por desalineamiento, pues tienen amplitudes mas grandes y provocan esfuerzos alternantes en los componentes del rotor, lo que lleva a fracturas de los componentes por fatiga. Este trabajo estudia y calcula las fuerzas de excitacion de las vibraciones inducidas por flujo. Se realiza el analisis del flujo, en dos etapas diafragma-rotor de una turbina de vapor, con base en el Modelado Computacional de Dinamica de Fluidos (MCDF). Las etapas de la turbina bajo estudio son la primera etapa o paso Curtis y la ultima etapa o etapa de baja presion de la Turbina. El paso Curtis esta formado por alabes pequenos y el flujo esta sometido a altas presiones. El ultimo paso esta compuesto por alabes grandes y el flujo esta sometido a bajas presiones. El MCDF resuelve numericamente las ecuaciones que representan la dinamica de fluidos y se obtiene la variacion del campo de presion en el claro axial rotor-estator causada por la interaccion de las estelas del borde de salida de los diafragmas con el movimiento de los alabes. La variacion del campo de presion induce fuerzas en los alabes ocasionando vibraciones forzadas. En cada una de las etapas se realizaron simulaciones en 2D y 3D, que se resolvieron en funcion del tiempo, usando el modelo de turbulencia RNG - y la tecnica de malla deslizante, para simular el movimiento de los alabes. Los modelos en 3D se resolvieron usando computo en paralelo en un cluster compuesto por 6 procesadores AMD Optaron e 64 bits, 2412.36 MHz y 8Gb de memoria RAM. Los resultados de las simulaciones en las dos etapas, permitieron obtener el comportamiento del campo de presion en el claro axial tobera-rotor y las fuerzas que este campo induce sobre los alabes. La fuerza sobre los alabes fue calculada usando un codigo que se ejecutaba en cada paso temporal de la simulacion, esta fuerza fue posteriormente analizada usando la transformada rapida de Fourier para obtener la fuerza sobre los alabes como una expresion matematica. Usar el MCDF para obtener las fuerzas que actuan sobre los alabes y que son inducidas por flujo representa una ventaja sobre otros metodos de calculo que usan geometrias simplificadas en 2D y caracteristicas de flujo promedio, y no toman en cuenta la geometria real de las turbinas ni consideran que el flujo sea no homogeneo. Ademas con el MCDF se obtiene que las fuerzas inducidas son ondulatorias (cambian en su magnitud con respecto al tiempo), otros metodos de calculo solo muestran una fuerza constante en el tiempo. Finalmente el estudio de la presion en el claro axial tobera-rotor mostro que cuando los alabes estan en movimiento, el campo de flujo para una region dada del claro es completamente ondulatorio con sus picos o valles en fase. Cambiando solo la amplitud de las ondas. Pero instantaneamente el campo de presion tienen una forma diferente alturas, asi como tambien el numero de picos y valles en cada perfil cambia en el sentido del claro.

  12. Determination of mercury in dentists through Neutron activation analysis; Determinacion de mercurio en odontologos mediante Analisis por activacion neutronica

    Energy Technology Data Exchange (ETDEWEB)

    Padilla M, M.A.; Granados C, F. [Instituto Nacional de Investigaciones Nucleares, Departamento de Quimica, A.P. 18-1027, C.P. 11801 Mexico D.F. (Mexico)

    2000-07-01

    It was determined the mercury levels in urine through Neutron activation analysis to 25 dentists who have been exposed to mercury by several time periods, because of the routine manipulations of amalgams. The determined concentrations of mercury were less to 10 {mu} g Hg/l of urine. The results were founded inside the safety limits reported in the literature. The mercury levels in the dentists are associated with a wide variety of factors that contribute to their exposure as: number of years of dental practice, number of amalgams manipulated between others. (Author)

  13. Fluorimetric determination of uranium in zirconium and zircaloy alloys; Determinacion fluorimetrica de uranio en aleaciones de zirconio y zircaloy

    Energy Technology Data Exchange (ETDEWEB)

    Acosta L, E. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)]. e-mail: eal@nuclear.inin.mx

    1991-05-15

    The objective of this procedure is to determine microquantities of uranium in zirconium and zircaloy alloys. The report also covers the determination of uranium in zirconium alloys and zircaloy in the range from 0.25 to 20 ppm on 1 g of base sample of radioactive material. These limit its can be variable if the size of the used aliquot one is changed for the final determination of uranium. (Author)

  14. Spectrophotometric determination of fluorides in water with Hach equipment; Determinacion espectrofotometrica de fluoruros en aguas con equipo Hach

    Energy Technology Data Exchange (ETDEWEB)

    Acosta L, E. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)]. e-mail: eal@nuclear.inin.mx

    1994-11-15

    The spectrophotometric method for the determination of the fluoride ion in water, demineralized water, raw waters, laundry waters and waters treated with ion exchange resins , using the technique and the SPADNS coloring indicated in the operation manual of the Hach equipment is described. This method covers the determination of the fluoride ion in the range from 0 to 2 mg/l on 25 ml. of radioactive base sample. These limits can be variable if the size of the used aliquot one is changed for the final determination of the fluoride ion. (Author)

  15. Spectrophotometric determination of silica in water with Hach equipment; Determinacion espectrofotometrica de silicio en aguas con equipo Hach

    Energy Technology Data Exchange (ETDEWEB)

    Acosta L, E. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)]. e-mail: eal@nuclear.inin.mx

    1992-06-15

    The method for the determination of the silica element in water, demineralized water, raw waters, laundry waters, waters treated with ion exchange resins and sea waters using the indicated technique in the operation manual of the Hach equipment with a DR/3 spectrophotometer is described. This method covers the determination of the silica element in the interval from 0 to 1.5 mg/l on 50 ml. of base sample. These limits its can be variable if the size of the used aliquot one is changed for the final determination of the silica element. (Author)

  16. Determination of some heavy metals in wetlands by PIXE; Determinacion de algunos metales pesados en jales por medio de PIXE

    Energy Technology Data Exchange (ETDEWEB)

    Ramirez O, J.; Rios M, C. [UAZ, 98160 Zacatecas (Mexico)

    2008-07-01

    In this work the results of the analysis are presented, using the PIXE technique (Proton Induced X-ray Emission), in soil samples of the El Bordo, Vetagrande, Zacatecas, before and after subjecting them to a lixiviation process for the recovering of gold, silver and mercury. This community is part of the mining region nearer to the Zacatecas city municipality, region in which the mining exploitation dates from the colonial time. During almost 350 years the 'yard benefit' method was used or amalgamation with mercury, process that besides having used big quantities of mercury, generated a great quantity of mineral waste calls 'mine wetlands', those that were accumulating, crawled by the rains, toward the streams that end in the prey 'The Pedernalillo'. The dispersion of wetlands them it has extended from the prey until the communities of Tacoaleche, Zoquite, Lampotal and El Bordo, embracing an approximate area of 16 x 2 Km{sup 2} and forming with the course of the time an accumulated of several millions of tons. In order to determining if the process of recovery of gold, silver and mercury make soluble to other contained metals in these wastes, samples were gathered in an area of 600 m{sup 2} in the community of The Border, Vetagrande, Zacatecas. Half of the samples were subjected to the lixiviation process in a local metal recovery plant and the other part was analyzed without processing. The analysis of both types of samples by means of the PIXE was carried out in the University of Arizona in Tucson. (Author)

  17. DETERMINACION DEL ORIGEN Y MECANISMO DE CONTAMINACION POR METALES Y METALOIDES EN LOS SUELOS DEL VALLE DE PUCHUNCAVÍ (Chile)

    OpenAIRE

    Parra Vargas, Sonnia MarbelL

    2013-01-01

    El impacto ambiental que sobre el suelo está ejerciendo el hombre ha originado que su contaminación sea uno de los problemas medio ambientales que está recibiendo una constante atención en los últimos años. La contaminación del suelo en Chile ha sido causada principalmente por elementos traza que emiten diversas actividades industriales, los cuales pueden contaminar al suelo por vía aérea a través de la deposición de material particulado de diferente granulometría y por emisiones gaseosas....

  18. Utilidad de un programa de rehabilitación en la prevención secundaria de la discapacidad del adulto mayor con cardiopatía isquémica : Centro Médico Naval, mayo 2002-mayo 2003

    OpenAIRE

    Santayana Calisaya, Nives Zoraida

    2009-01-01

    Objetivo: Determinar la mejora en la independencia en actividades de la vida diaria asociada a una mejor capacidad funcional en pacientes adultos mayores cardiopatía isquemica que asisten a un programa de Rehabilitación cardiaca fase II. Material y Métodos: Estudio prospectivo longitudinal en pacientes adultos mayores con antecedente de enfermedad isquemica compensada derivados al servicio de Medicina Física y Rehabilitación del Centro Medico Naval; se evaluaron los parámetros de la prueba...

  19. [Stroke in children. Experience in an emergency service].

    Science.gov (United States)

    Huici-Sánchez, Malka; Escuredo-Argullós, Laura; Trenchs-Sáinz de la Maza, Victoria; Luaces-Cubells, Carles

    2014-08-01

    Objetivos. Describir las caracteristicas de la enfermedad cerebrovascular (ECV) en pacientes atendidos en un servicio de urgencias pediatrico y detectar diferencias clinicas segun sea isquemica o hemorragica. Pacientes y metodos. Estudio retrospectivo, analitico observacional, realizado en el servicio de urgencias pediatrico de un hospital de tercer nivel. Se incluyen pacientes entre 1 mes y 18 años de edad atendidos en el servicio durante 10 años (enero de 2001 a diciembre de 2011) con diagnostico final de ECV. Se excluyen las hemorragias por traumatismos o secundarias a tumores, las trombosis de senos venosos y los pacientes no atendidos en el servicio. Resultados. Se incluyen 61 pacientes, 39 (63,9%) de sexo masculino, con una mediana de edad de 4,6 años (rango: 1,3 meses-17,5 años). De ellos, 26 (42,6%) presentan ECV isquemica y 35 (57,4%) ECV hemorragica. La cefalea (n = 20; 57,1%; p = 0,008) y los vomitos (n = 25; 71,4%; p = 0,001) son mas frecuentes en la ECV hemorragica, y la hemiparesia (n = 17; 65,4%; p < 0,001) y la paralisis facial (n = 7; 26,9%; p = 0,001), en la ECV isquemica. Las principales causas de la ECV hemorragica son las malformaciones arteriovenosas (n = 17; 38,6%), y las de la ECV isquemica, las arteriopatias (n = 6; 42,3%). Al alta, 27 (44,3%) presentaban diferentes grados de discapacidad y 6 (9,8%) fallecieron. Conclusiones. La ECV es una entidad poco frecuente, aunque presenta una elevada morbimortalidad. Se observa un ligero predominio de la ECV hemorragica y se comprueba que la ECV hemorragica se presenta mas con signos de hipertension intracraneal, y la isquemica, con focalidad neurologica.

  20. Distrofia miotônica e cardiopatia: comportamento dos eventos arrítmicos e dos distúrbios da condução Myotonic dystrophy and heart disease: behavior of arrhythmic events and conduction disturbances

    Directory of Open Access Journals (Sweden)

    Silvana Angelina D'Orio Nishioka

    2005-04-01

    Full Text Available OBJETIVO: Estudar a prevalência e a evolução natural dos eventos arrítmicos e distúrbios da condução, correlacionar o defeito genético com achados cardiovasculares, avaliar a mortalidade cardíaca, freqüência e fatores preditivos de morte súbita, correlacionar a gravidade do envolvimento neuromuscular e cardíaco e definir o papel do estudo eletrofisiológico (EEF, na distrofia miotônica. MÉTODOS: Realizados periodicamente avaliação clínica e exames complementares, exame genético, eletrocardiograma, ecocardiograma e Holter (exceto exame genético em 83 pacientes consecutivos com tempo médio de seguimento de 42±30,63 meses, sendo o estudo eletrofisiológico realizado em 59 casos. RESULTADOS: Taquiarritmia atrial foi observada em 10 (12% pacientes, taquicardia ventricular não sustentada (TVNS em 14 (17%, bloqueio átrio-ventricular (BAV 1º grau em 24 (29%, bloqueio de ramo esquerdo (BRE em 19 (23%, bloqueio de ramo direito (BRD em 13 (16%. Sintomas, aumento do intervalo PR, alargamento do QRS, fração de ejeção do ventrículo esquerdo (FEVE 70ms em 34% e >100ms em 11% (pós-procainamida. CONCLUSÃO: A prevalência dos eventos arrítmicos e distúrbios da condução foi de 50% a 80% após 6 anos, não se correlacionando ao defeito genético, sendo o flutter atrial, a arritmia sustentada mais freqüente. O envolvimento cardíaco aumentou com a piora da doença neuromuscular, mas essa progressão foi mais rápida que a neuromuscular. A mortalidade total foi baixa (11% e morte súbita ocorreu em metade dos casos. EEF identificou grupo de risco para implante de marcapasso.OBJECTIVE: To study the prevalence and natural evolution of arrhythmic events and conduction disturbances in myotonic dystrophy; to correlate the genetic defect with cardiovascular findings; to assess cardiac mortality, frequency, and predictive factors of sudden death; to correlate the severity of the neuromuscular and cardiac involvement; and to define the role of the electrophysiological study (EPS, in myotonic dystrophy. METHODS: Periodic clinical assessment and the following tests were performed in 83 consecutive patients with a mean follow-up of 42±30.63 months: complementary examinations, genetic tests, electrocardiography, echocardiography, and Holter; electrophysiological study was performed in 59 cases. RESULTS: Atrial tachyarrhythmia was observed in 10 (12% patients, NSVT in 14 (17%, first-degree AVB in 24 (29%, LBBB in 19 (23%, and RBBB in 13 (16%. Symptoms, an increase in the PR interval, QRS enlargement, LVEF 70 ms in 34% and > 100 ms in 11% (postprocainamide. CONCLUSION: The prevalence of arrhythmic events and conduction disturbances ranged from 50% to 80% after 6 years, and did not correlate with the genetic defect. Atrial flutter was the most common sustained arrhythmia. Cardiac involvement increased as the neuromuscular disease became aggravated, but progression of the cardiac involvement was more rapid than that of the neuromuscular disease. Overall mortality was low (11% and sudden death occurred in half of the cases. The EPS identified a group at risk for pacemaker implantation.

  1. Determination of copper in geological materials by X-ray fluorescence; Determinacion de cobre en materiales geologicos mediante fluorescencia de rayos X

    Energy Technology Data Exchange (ETDEWEB)

    Roca, M.; Bayon, A.

    1981-07-01

    X-ray fluorescence has been applied to the determination of copper content of geological materials in the concentration range of 0.01 to % CuO. A molybdenum target tube Is used, samples being presented in finely-ground powder form. Various methods for the correction for background and Instrumental copper interferences have been considered. To correct for matrix effects different tube scattered primary radiations have been tested as references or internal standards. MoK(41 - (C) provides the most suitable results. The use of influence empirical coefficients for the effect of iron on copper and of mass absorption coefficients has also been considered. For samples with a high content of lead, several procedures to correct for I t s influence have been investigated. Comparison between data obtained by X-ray fluorescence and wet-chemical techniques indicated good agreement. (Author) 6 refs.

  2. Determination of the particle size distribution in a powder using radiotracers; Determinacion de la distribucion de tamano de particulas en un polvo utilizando radiotrazadores

    Energy Technology Data Exchange (ETDEWEB)

    Revilla D, R

    1974-07-01

    To determine experimentally the particle size distribution in a powder the meshed method is generally used. This method has the disadvantage that in the obtained distribution is not observed at detail the fine structure of such distribution. In this work, a method for obtaining the distribution of particle size using radiotracers is presented. In the obtained distribution by this method it is observed with more detail the fine structure of the distribution, comparing with the obtained results by the classical method of meshed. The radiotracer method has major resolution for the experimental determination mentioned. In the chapter 1, it is done a brief analysis about theoretical aspects related with the method. In the first part it is analysed the particle behavior (sedimenting) in a fluid. The second part treats the relating with the radioactivity of an activated material as well as its detection. In the chapter 2, a description of the method is done also the experimental problems to applying to the alumina crystals sample are discussed. In the chapter 3 the obtained results and the mistake calculations in such results are showed. Finally, in the chapter 4 the conclusions and recommendations are given which is possible to obtain better results and improve to those in this work were obtained. (Author)

  3. Determination of leveled costs of electric generation for gas plants, coal and nuclear; Determinacion de costos nivelados de generacion electrica para plantas de gas, carbon y nucleares

    Energy Technology Data Exchange (ETDEWEB)

    Alonso V, G.; Palacios H, J.C.; Ramirez S, J.R.; Gomez, A. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)]. e-mail: galonso@nuclear.inin.mx

    2005-07-01

    The present work analyzes the leveled costs of electric generation for different types of nuclear reactors known as Generation III, these costs are compared with the leveled costs of electric generation of plants with the help of natural gas and coal. In the study several discount rates were used to determine their impact in the initial investment. The obtained results are comparable with similar studies and they show that it has more than enough the base of the leveled cost the nuclear option it is quite competitive in Mexico. Also in this study it is also thinks about the economic viability of a new nuclear power station in Mexico. (Author)

  4. Factors determining field of tapered beams in a unit stereotactic radiosurgery; Determinacion de factores campo de haces conicos en una unidad de radiocirugia estereotaxica

    Energy Technology Data Exchange (ETDEWEB)

    Brosed Aguillon, M. L.; Casal Mesa, M. D.; Forastero, C.; Sanchez Reyes, A.

    2013-07-01

    The difficulty of measuring small fields in radiosurgery, obliges the use of different detectors for measuring these beams tapered. Measures with two different detectors, should be coupled, through a middle ground, in which both detectors have a similar response. The objective will be to determine the factors of field of all the cones and the comparison with the results of other authors. (Author)

  5. Determination of total alpha activity index in samples of radioactive wastes; Determinacion del indice de actividad alfa total en muestras de desechos radiactivos

    Energy Technology Data Exchange (ETDEWEB)

    Galicia C, F. J.

    2015-07-01

    This study aimed to develop a methodology of preparation and quantification of samples containing radionuclides beta and/or alpha emitters, to determine the rates of alpha and beta total activity of radioactive waste samples. For this, a device of planchettes preparer was designed, to assist the planchettes preparation in a controlled environment and free of corrosive vapors. Planchettes were prepared in three means: nitrate, carbonate and sulfate, to different mass thickness, natural uranium (alpha and beta emitter) and in case of Sr-90 (beta emitter pure) only in half nitrate; and these planchettes were quantified in an alpha/beta counter, in order to construct the self-absorption curves for alpha and beta particles. These curves are necessary to determine the rate of alpha-beta activity of any sample because they provide the self-absorption correction factor to be applied in calculating the index. Samples with U were prepared with the help of the device of planchettes preparer and subsequently were analyzed in the proportional counter Mpc-100 Pic brand. Samples with Sr-90 were prepared without the device to see if there was a different behavior with respect to obtaining mass thickness. Similarly they were calcined and carried out count in the Mpc-100. To perform the count, first the parameters of counter operating were determined: operating voltages for alpha and beta particles 630 and 1500 V respectively, a count routine was generated where the time and count type were adjusted, and counting efficiencies for alpha and beta particles, with the aid of calibration sources of {sup 210}Po for alphas and {sup 90}Sr for betas. According to the results, the counts per minute will decrease as increasing the mass thickness of the sample (self-absorption curve), adjusting this behavior to an exponential function in all cases studied. The minor self-absorption of alpha and beta particles in the case of U was obtained in sulfate medium. The self-absorption curves of Sr-90 follow the same trend as U for beta particles. (Author)

  6. X-Ray Fluorescence Spectrometry. II Determination of Uranium in ores; Espectrometria de fluorescencia de Rayos X. II-Aplicacion a la determinacion de uranio en minerales

    Energy Technology Data Exchange (ETDEWEB)

    Bermudez Polonio, J.; Crus Castillo, F. de la; Fernandez Cellini, R.

    1961-07-01

    A method of analysis of uranium in ores by X-ray spectrometry was developed, using the internal standard technique. Strontium was found to be the most suitable internal standard for general use. A Norelco Philips X-ray fluorescent spectrometer was used in this work, equipped with a lithium fluoride crystal acting as a diffraction grating analyzer. The intensity of the uranium-L {alpha}{sub 1} spectral line is calculated and related to corresponding strontium-K{sub {alpha}} spectral line, both detected with a Scintillation Counter. (Author) 31 refs.

  7. Experimental determination of nuclear parameters for RP-0 reactor core; Determinacion experimental de los parametros nucleares para el nucleo tipo MTR del reactor nuclear RP-0

    Energy Technology Data Exchange (ETDEWEB)

    Cajacuri, Rafael A. [Sao Paulo Univ., SP (Brazil). Inst. de Fisica

    2000-07-01

    In the nuclear reactor for investigations RP-0 which is in Lima, Peru, that is a open pool class reactor with 1 to 10 watts of power and as a nuclear fuel uranium 238 enriched to 20% constituted by elements of Material Testing Reactor fuel class. This has reflectors of graphite and moderator of water demineralized. In 1996/1997 was measured in this reactor the following parameters: position of the control bar that make critic the reactor, critic height of moderator, excess of reactivity of the nucleus, parameter of reactivity for vacuum, parameter of reactivity for temperature, reactivity of its control bar, levels of doses in the reactor. (author)

  8. APLICACIÓN DE LA HERRAMIENTA FRAX® PARA LA DETERMINACION DEL RIESGO DE FRACTURA EN MUJERES DE UN ÁMBITO RURAL

    Directory of Open Access Journals (Sweden)

    Rafael Gómez Navarro

    2010-01-01

    Resultados: El número final de mujeres estudiadas fue 76, su edad media 67,9 ± 13,4. El riesgo absoluto de fractura osteoporótica fue del 8,1 ± 7,9 y el riesgo de fractura de cadera del 3,7 ± 5,3. Se recomendó solicitar DEXA en 9 (11,8% y plantear el inicio de tratamiento en 3 (3,9%. Para 9 mujeres (>84 años, la Guía no establecía recomendaciones. El número necesario de mujeres a cribar para indicar la realización de una DEXA es 8,4 y de 25,3 para iniciar un tratamiento. Se inició en los 3 casos recomendados y en otra mujer más para la que la Guía no emitía recomendación. Conclusiones: La herramienta FRAX® nos ha facilitado determinar de una manera sencilla el riesgo absoluto de fractura osteoporótica y de cadera de las mujeres de nuestra población lo que nos ha ayudado a decidir iniciar tratamiento antirresortivo casi en el 4 % de las estudiadas.

  9. Location and determination of steps of capacitors in shunt for distribution power lines; Localizacion y determinacion de pasos de capacitores en derivacion para lineas de distribucion

    Energy Technology Data Exchange (ETDEWEB)

    Pampin Vergara, Gabriela; Sarmiento Uruchurtu, Hector [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2001-07-01

    A methodology is presented to determine the optimal location of the capacitor banks in shunt for distribution networks. The proposed tool allows knowing the bank type to install (fixed, disconnect able or of pass), as well as the electrical parameters of the feeder and the economic benefit that the banks of capacitors represent, with a minimum of input data. Its development in a spreadsheet allows the analysis of numerous alternatives in an easy way. The method is based on that the structure of the feeders of distribution is, generally, of radial type, with which, and by means of an iterative process, the optimal location of the capacitor banks in shunt is looked for. The type of bank is determined based of the demand, as well as the number of steps. The results of the analysis in feeders of the network of the central area are shown. [Spanish] Se presenta una metodologia para determinar la localizacion optima de los bancos de capacitores en derivacion en redes de distribucion. La herramienta propuesta permite conocer el tipo de banco a instalar (fijo, desconcectable o de paso), asi como los parametros electricos del alimentador y el beneficio economico que representan los bancos de capacitores, con un minimo de datos de entrada. Su desarrollo en una hoja de calculo permite el analisis de numerosas alternativas de manera facil. El metodo se basa en que la estructura de los alimentadores de distribucion es, por lo general, de tipo radial, con lo cual, y por medio de un proceso iterativo, se busca la localizacion optima de los bancos de capacitores en derivacion. Se determina el tipo de banco en funcion de la demanda, asi como el numero de pasos. Se muestran resultados del analisis en alimentadores de la red del area central.

  10. Determination of optimal doses of radiation for the plant breeding of pseudo cereals; Determinacion de dosis optimas de radiacion para el mejoramiento de seudocereales

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez J, J. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico); Gomez P, L. [Universidad Nacional Agraria La Molina, Lima (Peru)]. e-mail: jgj@nuclear.inin.mx

    2005-07-01

    With the purpose of promoting the use of the radiations for the plant breeding of pseudo cereals, it was determined a simple and economic method that allows the quick selection of radiation dose that induce in the vegetable organisms the changes wanted. For it it was work with quinua seeds (Chenopodium quinoa Willd.) an Andean pseudo cereal that, due to their nutritious and physiologic characteristics it is considered by the FAO like one of the foods of the future and for the NASA like an organism that is good to remove the carbon dioxide from the atmosphere and at the same time, to generate food, oxygen and water for the crew during the space missions of long duration and that it has already improved by means of the radiation application. The proposed method consists on the evaluation, of the embryonic structures (radicule, hypocotyl and cotyledons) in the irradiated seeds as well as of the development of root, primary shaft and true leaves in the plants. The changes in the growth, form, number and color of the structures as well as the time of appearance of each one, allow to predict the morphological changes and inclusive some physiologic ones that will have the mature organisms, so that in only three weeks it is possible to select the doses more appropriate. (Author)

  11. Comparaci\\'on de tres t\\'ecnicas distintas con datos reales de pozo, en la determinaci\\'on de la permeabilidad

    CERN Document Server

    Torres, Julio

    2013-01-01

    We have used three different techniques for permeability prediction from porosity data in well PX12 at El Lago de Maracaibo. One of these techniques is statistical and is based in Fuzzy Logic. Another has been developed by H. Pape et al, based in Fractal Theory and the Kozeny-Carman equations, and the other one is an empirical model obtained in 1949 by Tixier. We have used 100% of the permeability-porosity data to obtain the predictor equations in each case. We have found bet- ter results with the statistical approach. The results obtained from the fractal model and the Tixier equations are similar in this case. We have also taken randomly 25% of the data to obtain the pre- dictor equations. In this case the best results are those obtained with fractal theory.

  12. Determination of the efficiency curve for a Si-Li detector; Determinacion de la curva de eficiencia para un detector de Si-Li

    Energy Technology Data Exchange (ETDEWEB)

    Aldape U, F.; Oliver, A.; Montenegro, E.C. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    1986-02-15

    In this work it is carried out a new calibration method for an X-rays detection system for PIXE analysis. This method it bases on the parametric expression introduced by Gallaher and Cipola in which the efficiency curve is obtained adjusting the parameters that they represent the solid angle, the attenuation in the absorbers of low Z and the absorption in the sensitive region of the detector, starting from calibrated radioactive sources, in those which those ray-X emitted its are in most of E > 10 KeV. In the region E < 10 Kev, the quantity of experimental points is poor and also, due to the absorption problems, its are the points where greater experimental error is made. (Author)

  13. Determination of NAPL contamination and evolution of remediation by means nuclear techniques; Determinacion de contaminacion NAPL y evolucion de remediacion mediante tecnicas nucleares

    Energy Technology Data Exchange (ETDEWEB)

    Balcazar, M.; Pena, P.; Lopez, A.; Flores, J. H.; Villegas, D. [ININ, 52750 La Marquesa, Estado de Mexico (Mexico); Schubert, M.; Knoller, K. [UFZ, Helmholtz Centre for Environmental Research-UFZ, Permoserstr. 15, 04318 Leipzig (Germany)]. e-mail: mbg@nuclear.inin.mx

    2008-07-01

    In this work the application of two nuclear techniques is presented: Natural radioactive tracer and stable isotopics tracer, that allow the localization and delimitation of the contamination in ground and underground water for hydrocarbons denominated NAPL. The work was carry out on the whole and with access permission to facilities and technical information, in a storage center and distribution of fuel of hydrocarbons where occurred a spill for hydrocarbons, approaching actions of remediation that allow to the date to fulfill the normative one applicable. By means of measurement of {sup 222} Rn, in situ, it was possible to be related its ground concentration to the degree of contamination previously determined; the evaluation of {sup 222} Rn in underground water in group with the determination of stable isotope {delta}{sup 34}S, {delta}{sup 18}O and {delta}{sup 13}C as well as the dissolved inorganic coal allowed to locate the contamination source in underground water to 100 m of depth in the aquifer and to determine the existence of a natural bioremediation. (Author)

  14. Determination of Cr and Cd concentration adsorbed by chicken feathers; Determinacion de concentracion de Cr y Cd adsorbido por plumas de pollo

    Energy Technology Data Exchange (ETDEWEB)

    Lopez M, A.; Cuapio O, L.A.; Cardenas P, S.; Balcazar, M. [ININ, 52750 La Marquesa, Estado de Mexico (Mexico); Jauregui, V.; Bonilla P, A. [ITA, Aguascalientes (Mexico)

    2008-07-01

    In this work the results of the samples analysis of chicken feathers are presented, used as adsorber of the heavy metals Cd and Cr present in water solutions with well-known concentrations of these metals. It was used the Neutron Activation Analysis technique (AAN), using the TRIGA Mark-III reactor of the Nuclear Center of Mexico. The obtained results they show the advantages of having a versatile installation for the analysis of this type of samples. By means of the analysis of the results, it was determined the feasibility of using chicken feathers like adsorber of these metals present in polluted waters, additionally, it was detected the presence of others polluting elements in the inputs to prepare the reference solutions as well as in the processes, so much of preparation of the feathers like of the metals adsorption. (Author)

  15. DETERMINACION DE DIFERENCIAS EN RIESGO DE RECEPCION Y DISEMINACION DE INFLUENZA AVIAR ALTAMENTE PATOGENA EN ZONAS DE PRORITARIAS PARA EL INGRESO DE ESTA ENFERMEDAD A CHILE

    OpenAIRE

    2010-01-01

    La influenza aviar altamente patógena (IAAP) se reconoce como una enfermedad animal prioritaria a nivel mundial, postulándose diversos mecanismos para expl icar la diseminación global de este virus. La estructura de los sectores productivos avícolas, y la forma en que son mantenidas las aves en di stintos países, puede ser un punto clave para el entendimiento de la epidemiología de la IAAP. Dentro de ellos. los sistemas productivos de traspatio (SPT) podrían tener un rol prepon...

  16. Direct determination of uranium in human urine by Icp-SFMS; Determinacion directa de uranio en orina humana por ICP-SFMS

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez M, H. [ININ, Departamento de Quimica, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico); Yllera de Ll, A., E-mail: hector.hernandez520@gmail.com [Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas, Departamento de Medio Ambiente, Av. Complutense 22, 28040 Madrid (Spain)

    2013-10-15

    The success of the measurement and the evaluation of the internal exposure are highly dependent of the effective capacities for the radiation measurement in biological samples (mainly urine and the feces). Usually, during the samples bioassay of human urine, a pre-concentration and purification of the radionuclides is carried out previously to the quantitative analysis. These stages, as the analysis time are the main source of uncertainty in the measurement process. In the uranium case, this is not necessary when are used mass spectrometry techniques, in particular, Mass Spectrometry of Magnetic Sector with Inductively Coupled Plasma (Icp-SFMS). This work presents the results obtained for the uranium analysis in samples of human urine during the participation in the inter-comparison exercises of the Association pour la Promotion de Controle de Qualite des Analyses de Biologie Medicale en Radiotoxicologie (PROCORAD) in the period 2010 and 2011. The analyses were realized directly in the diluted urine samples (dilution factor 1:20) in 5% of HNO{sub 3}. The obtained results, were normalized to the total urine sample (V = 0.5 L), these values coincide with the waited reference values of uranium in the urine sample. Additionally, were calculated the detection limits of {sup 235}U= 0.049 x 10{sup -3} μg L{sup -1} and {sup 238}U= 7.37 x 10{sup -3} μg L{sup -1}. (author)

  17. Determination of the costs of the nuclear desalination using the DEEP code from IAEA; Determinacion de los costos de la desalacion nuclear utilizando el codigo DEEP del OIEA

    Energy Technology Data Exchange (ETDEWEB)

    Ramirez S, J.R.; Palacios H, J.C.; Alonso V, G. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)]. e-mail: jrrs@nuclear.inin.mx

    2005-07-01

    The desalination of seawater is being an important solution to satisfy the demands of drinking water to population's centers that have hydric resources very limited, like it is the case of some Arab countries and arid regions of the planet, in where they have settled desalination plants that use as energy source to those fossil fuels or nuclear energy plants. Taking into account that the desalination of seawater is a process that consumes a lot of thermal and/or electric energy, it is necessary to quantify the costs of the supply and that of the desalination plant for different options and technologies, looking for this way the but appropriate for the specific conditions of the region where it has planned the desalination of seawater. In this report the three technologies but promising for the desalination are described and by means of the DEEP code the costs of production of water and energy are evaluated, using as thermal source different types of power nuclear reactors. It was obtained according to DEEP that the costs of the electricity generation for the considered reactors are around 40 USD/MWh. With these costs of electric power generation and using the DEEP code is obtained that the costs of production of drinking water are around 1 USD/m{sup 3}. (Author)

  18. Determination of low concentrations of thorium in geological materials by X-ray fluorescence; Determinacion de bajas concentraciones de torio en materiales geologicos mediante fluorescencia de rayos X

    Energy Technology Data Exchange (ETDEWEB)

    Roca, M.; Bayon, A.

    1981-07-01

    An X-ray fluorescence method for the determination of thorium in geological samples down to 2 ppm ThO{sub 2} has been developed. To achieve this determination limit an exposed area of the sample 42.5 mm in diameter is used, working with a molybdenum target tube operated at 90 kV and 30 m A. Corrections for background and line interference of the Rb K{alpha} radiation have been carefully considered and empirical correction coefficients calculated. (Author) 3 refs.

  19. Determination of the load state of lead-acid batteries using neural networks; Determinacion del estado de carga de baterias plomo-acido utilizando redes neuronales

    Energy Technology Data Exchange (ETDEWEB)

    Cristin V, Miguel A; Ortega S, Cesar A [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2005-07-01

    The charge of lead-acid batteries (LAB), as in any other type of batteries, consists of replacing the energy consumed during the discharge. Nevertheless, as no physical or chemical process is good enough to totality recharge a battery, it is necessary to supply to it more than the 100% of the energy demanded during its discharge. A critical factor to make a suitable load control of the batteries is to determine its own state of load. That is to say, to have an efficient load control, it is necessary to count on means that allow to accurately determining the residual capacity of the battery to deliver load. This one is the one of the aspects of greater interest in the research centers around world. For this reason, in this work it was pretended to develop a calculation algorithm of the state of load of batteries based on a fuzzy-neural network that could calculate the state of load without using the battery current as an input. This is because one of the main problems for the designers of battery load controllers is the correct supervision of the current that circulates around the system in all the rank of operation of the same one because the sensors do not have a linear behavior. [Spanish] La recarga de baterias plomo-acido (BPA), como cualquier otro tipo de baterias, consiste en reponer la energia consumida durante la descarga. Sin embargo, como ningun proceso fisico o quimico es lo bastante eficiente para recargar a totalidad una bateria, es necesario suministrarle mas del 100% de la energia demandada durante su descarga. Un factor critico para realizar un adecuado control de carga de las baterias, es determinar su propio estado de carga. Es decir, para tener un control de carga eficiente, es necesario contar con un medio que permita determinar con precision la capacidad remanente de la bateria para entregar carga. Este es uno de los aspectos de mayor interes en los centros de investigacion alrededor el mundo. Por tal razon, en este trabajo se propuso desarrollar un algoritmo de calculo del estado de carga de baterias basado en una red neuro-difusa que pudiera calcular el estado de carga sin utilizar la corriente de la bateria como entrada. Ello se debe a que uno de los principales problemas para los disenadores de controladores de carga de bateria es la correcta supervision de la corriente que circula por el sistema en todo el rango de operacion del mismo pues los sensores no tienen un comportamiento lineal.

  20. Informe sobre el avance del proyecto de determinaciones de V sen i para todas las estrellas B más brillantes que 6.5 mag.

    Science.gov (United States)

    Abt, H.; Levato, H.

    Se ha finalizado con la determinación de V sen i para todas las estrellas B más brillantes que 6.5 mag y al norte de -30 grados de declinación. Esta muestra involucra casi 1000 estrellas. Las observaciones fueron realizadas desde KPNO. Mientras tanto, se ha completado desde CASLEO la observación de 350 estrellas B más brillantes que 6.5 mag. al sur de -30 grados. Además de la determinación de la rotación axial se determinan, en los casos posibles, los anchos equivalentes de las líneas 4471 Ådel He I y 4481 Ådel Mg II.

  1. Direct reading spectrochemical determination of aluminium, iron and silicon in fluorite; Determinacion espectroquimica de lectura directa de aluminio, hierro y silicio en fluorita

    Energy Technology Data Exchange (ETDEWEB)

    Roca, M.

    1966-07-01

    A quantitative spectrochemical method for the determination of Al, Fe and Si in fluorite has been worked out. The sample was supported in a graphite electrode with crater of 5 mm. in diameter, 2,5 mm deep, and burned by a d.c. are in a direct reading spectrometer. The excitation of samples has been studied without dilution as well as using graphite powder as diluent in the ratios 1:1, 1:4, and 1:9; the latter factor was chosen. Ag, Ca, Co, Cr, Mo and Sn were tested as internal standards. It has not been found any significant inter element effect. It is necessary to use natural fluorite as base material for the standards. (Author) 5 refs.

  2. Verificación analítica para las determinaciones de cromo hexavalente en aguas por espectrofotometría

    Directory of Open Access Journals (Sweden)

    Carlos Alberto Severiche Sierra

    2013-06-01

    Full Text Available En la actualidad la prestación de servicios analíticos de laboratorios, toma de forma ascendente más auge y utilidad. El efecto de un análisis de aguas es forjar resultados correctos y confiables, siendo la verificación de ensayos uno de los aspectos más importantes y factor clave para conseguir este propósito. La determinación de cromo hexavalente en aguas por colorimetría con la difenilcarbazida es la metodología analítica más usada y útil que se conoce en el ámbito científico técnico, principalmente, por su alta selectividad y también debatida por su reacción a las interferencias. En el presente estudio se hizo la valoración analítica del método espectrofotométrico para la determinación de cromo hexavalente en aguas; el objetivo de este trabajo fue confirmar correctamente la aplicación del método para el análisis de aguas. Se trabajaron muestras de diferentes tipos de agua: potable, residual y superficial, siguiéndose estrictamente los protocolos de verificación. Se encontraron resultados satisfactorios en precisión y exactitud con el fin de emitir resultados confiables y reales de la muestra analizada.

  3. Determination comparative study of esophageal cancer treatments with helical tomotherapy; Determinacion estudio comparativo de tratamientos de cancer de esofago con tomoterapia helicoidal, IMRT dinamica y 3DCRT

    Energy Technology Data Exchange (ETDEWEB)

    Pinto Monedero, M.; Sanchez Rubio, P.; Rodriguez Romero, R.

    2013-07-01

    The aim of this study was to compare the effectiveness of treatments dynamic intensity modulated radiation therapy and helical tomotherapy in cases of esophageal cancer, in terms of PTV coverage and dose reduction in OARs compared to 3D conformal radiotherapy treatments. (Author)

  4. DESARROLLO DE METODOLOGIAS ANALITICAS PARA LA DETERMINACION DE HIODROCARBUROS AROMATICOS POLICICLICOS EN ALIMENTOS GRASOS MEDIANTE ESPECTROSCOPIA DE FLUORESCENCIA Y CALIBRACION MULTIVARIADA

    OpenAIRE

    ALARCON RODRIGUEZ, FRANCIS PAMELA

    2013-01-01

    Los hidrocarburos aromáticos policíclicos (PAHs), generados por combustión incompleta de materia orgánica, presentan particular interés debido a sus características cancerígenas y/o mutagénicas. Para el ser humano una de las vías de exposición a los PAHs es el consumo de alimentos grasos como los aceites vegetales. Los principales problemas de la determinación de PAHs en estas matrices oleosas son su baja concentración y la presencia de diversos interferentes. En general, su determin...

  5. Determination of interplanar distances starting from diffraction spectra for PC microcomputer; Determinacion de distancias interplanares a partir de espectros de difraccion para microcomputadora PC

    Energy Technology Data Exchange (ETDEWEB)

    Macias B, L.R

    1991-07-15

    The objective of this work, consists in that starting of a digitized diffraction spectra result of the structural analysis technique, it is possible by means of the analysis of a computer program, to detect the diffraction peaks and well-known the wavelength to obtain the values of the interplanar distances to be compared with the JCPDS (Joint Committee on Powder Diffraction Standards). (Author)

  6. BUSQUEDA Y CARACTERIZACION DE BACTERIOFAGOS ESPECIFICOS PARA AGGREGATIBACTER ACTINOMYCETEMCOMITANS Y FUSOBACTERIUM NUCLEATUM: DETERMINACION DEL EFECTO BACTERIOLITICO SOBRE ESTAS BACTERIAS EMBEBIDAS EN UNA BIOPELICULA DENTAL

    OpenAIRE

    CASTILLO RUIZ, MARIO HERNAN

    2012-01-01

    Las enfermedades periodontales asociadas a la placa dental son un importante problema de salud pública, tanto en nuestro país como en todo el mundo. Se estima que en Chile la prevalencia de esta enfermedad en la población adulta es mayor al 90%. Los tratamientos actuales son largos y en algunos casos muy costosos lo que impide que todas las personas tengan acceso a ellos. La etiología de las enfermedades periodontales es atribuida tanto a factores del hospedero como a la placa dental, que cor...

  7. Design quality control of the activity determination total alpha liquid effluents; Diseno de control de calidad de la determinacion de actividad alfa total en efluentes liquidos

    Energy Technology Data Exchange (ETDEWEB)

    Yague, L.; Alvarez, A.; Navarro, N.; Noguerales, C.

    2011-07-01

    The total alpha activity index is the joint action of all alpha emissions in a sample. This is a very useful in designing the analytical control of liquid effluent into the environment. Presents the design of quality control applied to the determination of total alpha activity.

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

    Energy Technology Data Exchange (ETDEWEB)

    Elizalde D, J

    1973-07-01

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

  9. Determination of the local flow in a BWR by means of neutron noise analysis; Determinacion del caudal local en un BWR por medio del analisis de ruido neutronico

    Energy Technology Data Exchange (ETDEWEB)

    Ruiz E, J.A.; Castillo D, R.; Rojas S, A. [ININ, 52750 La Marquesa, Estado de Mexico (Mexico); Blazquez M, J. [CIEMAT, Madrid (Spain); Calleros M, G. [CFE, Alto Lucero, Veracruz (Mexico)]. e-mail: jare@nuclear.inin.mx

    2007-07-01

    The signal to noise of the local power of range monitors (LPRM for their initials in English) its are used to estimate the reactor power, but this signal includes information of the dynamic behavior of a boiling water reactor. An interesting parameter that one can obtain by means of the data of the local power monitors is the resistance time of the holes. That to make with the measures of these times that are inversely proportional to the local flow? It can be carried out a 'local surveillance' of the flow. In this work a relationship that allows to obtain the permanency time of the holes in the refrigeration channel in the reactor core with base in the mensurations of the index of the decay ratio and of the characteristic frequency value of the reactor of the neutronic signal in stationary state. The method of the first minimum of the transfer function between two detectors of neutron flow to different height to obtain the local residence time of the holes is also presented. For the determination of the permanency time of the holes in the refrigeration channel obtained signals of the backs of the SIIP of special sampling of the Unit 2 of Laguna Verde Central during 2006 were used. Firstly its were preconditioning the power signals and the signals of the neutronic noise to which are applied the first minimum method in the transfer function were obtained. Later on the STABIL code was used which contains an autoregressive model to obtain the DR and the frequency, with those that the holes residence times were determined. (Author)

  10. DETERMINACION DE LA INCIDENCIA DE LA ENTONACION EN LA PRODUCCION Y PERCEPCION DE ORACIONES DECLARATIVAS CON FOCALIZACION DE TIPO CONTRASTIVA EN HABLANTES DE ESPAÑOL DE CONCEPCION

    OpenAIRE

    RUIZ MELLA; MAGALY SILVIA

    2011-01-01

    El presente trabajo es un estudio de fonética acústica orientado hacia el análisis de la función informativa de foco en el plano pragmático. Este estudio se enmarca dentro de un proyecto de investigación, cuyo propósito es describir la integración de los componentes acústicos, sintácticos y textuales en la producción de focos marcados y su organización tipo lógica del español de Chile. Entre los objetivos de este proyecto interdisciplinario estaba el de abordar desde un punto de vist...

  11. Determination of the mechanical properties of the hydrides of zirconium by nano indentation techniques; Determinacion de las propiedades mecanicas de los hidruros de circonio mediante tecnicas de nanoindentacion

    Energy Technology Data Exchange (ETDEWEB)

    Ruiz Hervias, J.; Rico, A.; Martin Rengel, M. A.

    2013-07-01

    The mechanical properties of nuclear fuel cladding may be affected by the presence of hydrides. In most studies until now, the average mechanical properties of the zirconium matrix and the hydrides have been measured. In this paper, nano indentation techniques were used to assess the mechanical properties of both phases, namely the zirconium hydrides and matrix, separately. To this end, pre-hydrided cladding samples with 150 and 1200 ppm hydrogen were employed, and the elastic modulus, hardness and yield stress were obtained for both phases.

  12. Determination of isodose curves in Radiotherapy using an Alanine/ESR dosemeter; Determinacion de curvas de isodosis en Radioterapia usando un dosimetro de Alanina/ESR

    Energy Technology Data Exchange (ETDEWEB)

    Chen, F.; Baffa, O.; Graeff, C.F.O. [Departamento de Fisica e Matematica. Universidade de Sao Paulo FFCLRP. 14040-901 Ribeirao Preto-SP (Brazil)

    1998-12-31

    It was studied the possible use of an Alanine/ESR dosemeter in the isodose curves mapping in normal treatments of Radiotherapy. It was manufactured a lot of 150 dosemeters with base in a mixture of D-L Alanine dust (80 %) and paraffin (20 %). Each dosemeter has 4.7 mm diameter and 12 mm length. A group of 100 dosemeters of the lot were arranged inside 50 holes of the slice 25 of the phantom Rando Man. The phantom irradiation was realized in two opposed projections (AP and PA) in Co-60 equipment. A group of 15 dosemeters was take of the same lot for obtaining the calibration curve in a 1-20 Gy range. After irradiation the signal of each dosemeter was measured in an ESR spectrometer operating in the X-band ({approx} 9.5 GHz) and the wideness of Alanine ESR spectra central line was correlated with the radiation dose. The wideness dose calibration curve resulted linear with a correlation coefficient 0.9996. The isodose curves obtained show a profile enough similar at comparing with the theoretical curves. (Author)

  13. Determination of the geothermal well damage from its production tests; Determinacion del dano en pozos geotermicos a partir de sus pruebas de produccion

    Energy Technology Data Exchange (ETDEWEB)

    Aragon Aguilar, Alfonso; Izquierdo Montalvo, Georgina; Arellano Gomez, Victor [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2011-06-13

    In this work the evolution is described that undergoes the factor of damage in a well during its productive stage, which is identifiable from the diminution in the characteristics of its production. It is mentioned that during the productive stage of wells, its declination is, in many occasions, synonymous of the damage presence. Traditionally, the damage effect is determined from the equations for analysis of the transitory tests of pressure. Nevertheless, the execution of this type of tests requires relatively long periods of time to obtain the stabilization of the well and of significant costs. By the previous facts the development of techniques to determine the damage from production tests was initiated. In this article is presented the curve-type of geothermal inflow affected by the damage, from which the value of this one in a geothermal well for the time in which its test of production is realized can be determined. A methodology is proposed to determine the damage effect in the well using the proposed curve-type and its applicability with examples of test measurements of well discharge is demonstrated in Mexican geothermal fields. From the conducted analyses it is found that the numerical value of the damage determined in selected wells increases based on the time of exploitation, which indicates a deterioration of its productive characteristics. The previous statements aid to constitute a technical endorsement for the decision making, on the pertinent actions that can be executed in the well. [Spanish] En este trabajo se describe la evolucion que sufre el factor de dano en un pozo durante su etapa productiva, el cual es identificable a partir de la disminucion en las caracteristicas de su produccion. Se menciona que durante la etapa productiva de los pozos, su declinacion es, en muchas ocasiones, sinonimo de la presencia de dano. Tradicionalmente, el efecto de dano se determina a partir de las ecuaciones para analisis de las pruebas transitorias de presion. Sin embargo, la ejecucion de este tipo de pruebas requiere de periodos relativamente largos de tiempo para lograr la estabilizacion del pozo y de costos significativos. Por lo anterior se empezaron a desarrollar tecnicas para determinar el dano a partir de pruebas de produccion. En este articulo se presenta la curva-tipo de influjo geotermico afectada por dano, a partir de la cual se puede determinar el valor de este en un pozo geotermico para el tiempo en que se realiza su prueba de produccion. Se propone la metodologia para determinar el efecto de dano en el pozo usando la curva-tipo propuesta y se demuestra su aplicabilidad con ejemplos de mediciones de pruebas de descarga en pozos de campos geotermicos mexicanos. De los analisis efectuados se encuentra que el valor numerico del dano determinado en los pozos seleccionados aumenta en funcion del tiempo de explotacion, lo cual indica un deterioro en sus caracteristicas productivas. Lo anterior ayuda a conformar un respaldo tecnico para la toma de decisiones, sobre las acciones pertinentes que pueden ejecutar en el pozo.

  14. Spectrographic determination of metallic impurities in organic coolants for nuclear reactors; Determinacion espectrografica de impurezas metalicas en refrigerantes organicos para reactores nucleares

    Energy Technology Data Exchange (ETDEWEB)

    Martin Munoz, M.; Alvarez Gonzalez, F.

    1969-07-01

    A spectrochemical method for determining metallic impurities in organic coolants for nuclear reactors is given. The organic matter in solid samples is eliminated by controlled distillation and dry ashing in the presence of magnesium oxide as carrier. Liquid, samples are vacuum distillated. The residue is analyzed by carrier distillation and by total burning techniques. The analytical results are discussed and compared with those obtained destroying the organic matter without carrier and using the copper spark technique. (Author) 12 refs.

  15. Electron density and temperature determination in a Tokamak plasma using light scattering; Determinacion de la densidad y temperatura electronicas en un Tokamak mediante difusion luminosa

    Energy Technology Data Exchange (ETDEWEB)

    Perez-Navarro Gomerz, A.; Zurro Hernandez, B.

    1976-07-01

    A theoretical foundation review for light scattering by plasmas is presented. Furthermore, we have included a review of the experimental methods for electron density and temperature measurements, with spatial and time resolution, in a Tokamak plasma using spectral analysis of the scattered radiation. (Author) 13 refs.

  16. Fluor determination by alkaline hydrolysis of the uranium and thorium fluorides; Determinacion de fluor por hidrolisis alcalina en fluoruros de uranio y torio

    Energy Technology Data Exchange (ETDEWEB)

    Barrachina Gomez, L.; Gasco Sanchez, L.

    1961-07-01

    The alkaline hydrolysis of the uranium and thorium fluorides is studded and a new method for the determination of the fluoride, on the basis of a indirect volumetric titration with standard soda, is proposed. The compounds that may influence the hydrolysis of the uranium fluoride and that may be occasionally found in it as impurities are also studied. the method can be applied to the uranium fluoride except when there is a great quantity of F{sub 2}UO{sub 2} or UO{sub 3} present in the sample. (Author) 20 refs.

  17. Analysis of inflow in geothermal wells to determine their maximum flow; Analisis del influjo en pozos geotermicos para la determinacion de sus flujos maximos

    Energy Technology Data Exchange (ETDEWEB)

    Aragon-Aguilar, Alfonso; Izquierdo-Montalvo, Georgina; Pal-Verma, Mahendra; Santoyo-Gutierrez, Socrates [Instituto de Investigaciones Electricas (Mexico); Moya-Acosta, Sara L [Centro Nacional de Investigacion y Desarrollo Tecnologico (Mexico)

    2009-01-15

    Inflow performance relationships developed for petroleum and geothermal reservoirs are presented. Four of them were selected to be used in this work. Such relationships were developed considering features of a typical geothermal system. The performance of the selected relationships was assessed using data from production tests in several wells of different fields. A methodology is presented to determine the value of the maximum flow (W{sub max}) from the inflow relationships; its application is demonstrated using the data of the 10 production tests. It was found that the calculated value of W{sub max} under stabilization conditions may be related to the reservoir response. In general, there is a good agreement between the calculated values of W{sub max} from the different methods. The differences in the W{sub max} values vary within 10%. It was found that the stability in the calculated values of W{sub max} as a response of the reservoir is a function of the flow magnitude. So, the wells with flow greater than 200 t/h reach the stability of W{sub max} at openings 50% less of their total capacity. [Spanish] Se presentan las relaciones del comportamiento de influjo desarrolladas para yacimientos petroleros y geotermicos. Se seleccionaron cuatro de ellas para usar en este trabajo. Tales relaciones fueron desarrolladas considerando condiciones de un sistema geotermico tipico. Se analizo el comportamiento de las relaciones escogidas utilizando datos de pruebas de produccion de varios pozos de diferentes campos. Se presenta una metodologia para determinar el valor del flujo maximo (W{sub max}) a partir de las relaciones de influjo; se demuestra su aplicabilidad usando los datos de diez pruebas de produccion. Se encontro que el valor de W{sub max} calculado bajo condiciones de estabilizacion se puede relacionar con la respuesta del yacimiento. En general se encuentra buena concordancia entre los valores calculados de W{sub max} usando los diferentes metodos. Las diferencias en los valores de W{sub max} varian dentro de 10%. Se encontro que la estabilidad en los valores calculados de W{sub max} como una respuesta del yacimiento es funcion de la magnitud del flujo. Asi para pozos con flujos mayores de 200t/h, la estabilidad en los valores de W{sub max} se alcanza a aperturas menores del 50% de su capacidad total.

  18. Commercial sugar, an alternative dosemeter for the dose determination in radiological emergency conditions; Azucar comercial, un dosimetro alternativo para la determinacion de dosis en situaciones de emergencia radiologica

    Energy Technology Data Exchange (ETDEWEB)

    Urena N, F.; Galindo, S. [Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    1997-07-01

    It was carried out the dosimetric evaluation of commercial sugar, with the purpose to determine the feasibility to be able to use this type of substance as a dosimetric material in cases to present some radiological emergency cases. The studied parameters using the Electron Paramagnetic Resonance (EPR) technique were: pre-doses signal or depth signal, dose-response stability, reproducibility, reliability and signal clearing decreasing. (Author)

  19. Determinacion de las características fisicas y propiedades mecanicas de papa cultivada en Colombia Determination of physical characteristics and mechanical properties of potatoes cultivated in Columbia

    Directory of Open Access Journals (Sweden)

    Germán V. Buitrago

    2004-04-01

    Full Text Available El objetivo del proyecto es determinar las propiedades físico-mecánicas de tres variedades de papa (criolla, pastusa y capiro, necesarias para el diseño y operación de maquinaria para siembra, cosecha, postcosecha y para el adecuado almacenamiento del producto. Se midieron propiedades físicas como: dimensiones axiales, esfericidad, redondez, ángulo de reposo, densidad real, densidad aparente y porosidad. Igualmente se determinaron propiedades mecánicas tales como: resistencia a la compresión, al corte, al punzonamiento y coeficiente de fricción. Se tomaron como factores de variación para cada variedad, el tamaño y el tiempo de toma de las observaciones (cada 15 días durante 90 días, utilizando el método por bloques completamente aleatorios. Los datos fueron sometidos a un análisis estadístico de varianzas, utilizando el método Duncan. Las propiedades físicas variaron de manera similar, de tal manera que la esfericidad y la redondez aumentava a medida que el tamaño disminuye. La porosidad es superior al 48% y el ángulo de reposo es el característico de formas aproximadamente esféricas para las tres variedades analizadas. La principal influencia sobre la variabilidad en las propiedades mecánicas es el cambio en el contenido de humedad; también se detectó una pérdida de turgencia con el paso del tiempo que genera mayor elasticidad en el tubérculo, lo cual le permite soportar mayores cargas. La variedad Criolla presenta una resistencia entre tres y cinco veces mayor al corte, punzonamiento y compresión, con relación a las variedades Capiro y Pastusa.The aim of this work is to determine the physical and mechanical properties of three varieties of potatoes (Criolla, Pastusa and Capiro, in order to use them in the design and management of sowing, harvest and postharvest machines and adopt storage time of potato. Some of the physical properties like: axial dimensions, sphericity, roundness, repose angle, apparent density, real density and porosity were measured, as well as the mechanical properties like: compression, punction and cut strength and friction coefficient. The factor of variation such as size and the sampling time (every 15 days during 3 months were involved for each variety of potato using a completely random block design. The data were analyzed statistically through the analysis of variance by the Duncan´s method. The physical properties varied in similar way, the sphericity and roundness increased when the size reduced. The porosity is higher than 48% while the repose angle obtained is characteristic of approximately spherical shapes for three analyzed varieties. The principal influence over the variability in the mechanical properties is the change in the moisture content, besides, a turgency loss was observed during the storage time that provides more elasticity in the tuber which permit the tuber to bear higher loads. The Criolla variety showed a strength between three to five times more than Capiro and Pastusa varieties in cut, punction and compression test.

  20. Determination of effective dose in pediatric radiodiagnostic in Medellin-Colombia; Determinacion de la dosis efectiva en radiodiagnostico pediatrico en Medellin-Colombia

    Energy Technology Data Exchange (ETDEWEB)

    Garzon, William J., E-mail: wjaramig@gmail.com [Instituto Tecnologico Metropolitano (ITM), Medellin (Colombia); Aramburo, Javier M.; Jimenez, Angelmiro A.; Ortiz, Anselmo P., E-mail: jmorales@unal.edu.co, E-mail: aarrieta@unal.edu.co, E-mail: japuerta@unal.edu.co [Universidad Nacional de Colombia (UNAL), Medellin (Colombia)

    2013-10-01

    In order to know the effective dose in pediatric X-ray exams of chest, entrance surface dose measurements were performed for ages 1,5 and 10 years in the largest pediatric hospital in the city of Medellin, Colombia. The effective dose was obtained from applying the conversion coefficients to measures of the entrance surface dose (ESD) in 306 radiographic studies in AP and LAT I projections. The results were validated with PCXMC 2.0 computer program and other work reported in the literature. (author)

  1. Development of an expert system for preheating temperatures determination. Desarrollo dse uns sistema experto para la determinacion de temperatura de precalentamiento

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, E.; Silva, M.; Gonalvez, P.; Fernandez, A.A. (Oporto Univ. (Portugal) Facultad de Ingenieria)

    1989-01-01

    This work describes the development of an expert system designed to control the cold fissuration phenomenon caused by H{sup 2} on welded joints of carbonated, C-Mn and light alloy steels, obtained through fusion welding (manual electric arc, MIG/MAG, TIG and submerged arc). This system, implemented in PROLOG language, allows a quick and simple calculation of preheating temperatures. The aim of this system, which does not require programming knowledge to be updated, is to help welding engineers to design welding procedures which are safe as regards to the joint resistance to cold fissuration. Being an expert system, the user has the opportunity to obtain interactive explanations about the way any conclusions are obtained, as well as information about the concepts and parameters on which the reasoning is based.(Author)

  2. Determination of the effective delayed neutron fraction in the Coral-I Reactor; Determinacion de la fraccion efectiva de neutrones retardados en el Reactor Coral-1

    Energy Technology Data Exchange (ETDEWEB)

    Francisco, J. L. de; Perez-Navarro, A.; Rodriguez-Mayquez, E.

    1973-07-01

    The effective delayed neutron fraction, {beta} eff, has been determined from the measurement of E / {beta}{sup 2}, by means of reactor noise analysis in the time domain, and the neutron detector efficiency, {epsilon}. For the {epsilon} measurement it is necessary to determine the fission rate in the reactor. This value can be obtained from the absolute measurement of the fission rate per cm{sup 3}, at a certain point of the reactor, and the determination of these two values ratio, which has been calculated by the Monte Cario method and also measured with results in good agreement. (Author)

  3. Application of laser-produced-plasmas to determination of carbon content in steel; Aplicacion de los plasmas generados por laser a la determinacion de carbono en aceros

    Energy Technology Data Exchange (ETDEWEB)

    Ortiz, M.; Aragon, C.; Aguilera, J. A.; Campos, J.

    1994-07-01

    This paper describes an analytical method to determine carbon content in solid and molten steel. It is based on the study of the emission spectrum from a Nd-YAG laser produced plasma. The light emitted from the plasma is focused to the entrance slit of a spectrometer and detected by an OMA III system. For every laser pulse an spectral range of 100 A are recorded. With the use of time-resolved spectroscopy a precision of 1.6 % and a detection limit of 65 ppm of carbon content in steel have been obtained. These values are similar to those of other accurate conventional techniques but using optics fiber and laser excitation it is possible to made sample calibrations in hostile environments. Also, as the analysis are made in real time changes in sample composition can be measured without stopping production processes. (Author) 26 refs.

  4. X-Ray Fluorescence Spectrometry. I.- Determination of thorium in ores; Espectrometria de fluorescencia de rayos X. A.- Aplicacion a la determinacion de torio en minerales

    Energy Technology Data Exchange (ETDEWEB)

    Bermudez Polonio, J.; Crus Castillo, F. de la; Fernandez Cellini, R.

    1961-07-01

    A X-ray spectrometric method has been developed for analysis of thorium in ores in the range of concentration from 0.01 to 0.5 percent ThO{sub 2}, using selenium as a internal standard. The concentration of thorium is determined in a working curve prepared by plotting the percentage of ThO{sub 2} against the ratio intensity of the Th L{alpha}{sub 1} line to Sek{sub {beta}}1 line. (Author) 17 refs.

  5. The determination of phosphorus in uranium minerals and resulting solutions; Determinacion de fosforo en minerales de uranio y soluciones procedentes de su beneficio

    Energy Technology Data Exchange (ETDEWEB)

    Petrement Eguiluz, J. C.; Rarellada Bellod, R.; Fernandez Cellini, R.

    1964-07-01

    Interferences of several elements present in Spanish uranium minerals in the phosphorus determination by the spectrophotometrical method of the molibdovanada te phosphoric acid are studied. A method is described with a previous separation of these element by a cationic resin. This method is successfully applied to the phosphorus determination in acid or alkaline lixiviation solutions of uranium minerals, as well as in the evaluates of ion exchange resins used used technically for the concentration of solutions with a low uranium content. (Author) 11 refs.

  6. Monte Carlo simulation: tool for the calibration in analytical determination of radionuclides; Simulacion Monte Carlo: herramienta para la calibracion en determinaciones analiticas de radionucleidos

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez, Jorge A. Carrazana; Ferrera, Eduardo A. Capote; Gomez, Isis M. Fernandez; Castro, Gloria V. Rodriguez; Ricardo, Niury Martinez, E-mail: cphr@cphr.edu.cu [Centro de Proteccion e Higiene de las Radiaciones (CPHR), La Habana (Cuba)

    2013-07-01

    This work shows how is established the traceability of the analytical determinations using this calibration method. Highlights the advantages offered by Monte Carlo simulation for the application of corrections by differences in chemical composition, density and height of the samples analyzed. Likewise, the results obtained by the LVRA in two exercises organized by the International Agency for Atomic Energy (IAEA) are presented. In these exercises (an intercomparison and a proficiency test) all reported analytical results were obtained based on calibrations in efficiency by Monte Carlo simulation using the DETEFF program.

  7. DETERMINACION DE LA INCIDENCIA DE LA ENTONACION EN LA PRODUCCION Y PERCEPCION DE ORACIONES DECLARATIVAS CON FOCALIZACION DE TIPO CONTRASTIVA EN HABLANTES DE ESPAÑOL DE CONCEPCION

    OpenAIRE

    RUIZ MELLA, MAGALY SILVIA

    2011-01-01

    El presente trabajo es un estudio de fonética acústica orientado hacia el análisis de la función informativa de foco en el plano pragmático. Este estudio se enmarca dentro de un proyecto de investigación , cuyo propósito es describir la integración de los componentes acústicos, sintácticos y textuales en la producción de focos marcados y su organización tipo lógica del español de Chile. Entre los objetivos de este proyecto interdisciplinario estaba el de abordar desde un punto de vista exclus...

  8. Determination of the dose index in computerized tomography using thermoluminescent dosemeters; Determinacion del indice de dosis en tomografia computada usando dosimetros termoluminiscentes

    Energy Technology Data Exchange (ETDEWEB)

    Azorin, J.C.; Calderon, A. [Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada-IPN, 11500 Mexico D.F. (Mexico); Azorin, J. [UAM-I, 09340 Mexico D.F. (Mexico)

    2004-07-01

    In this work the obtained results of the determination of the dose index are presented in thorax studies in computed tomography and helical tomography carried out in Mexico using thermoluminescent dosemeters of LiF: Mg,Cu,P + Ptfe developed and manufactured in our country. The results showed that under similar conditions of irradiation and operation (pitch = 1), significant differences don't exist among the doses absorbed measures in the phantom due to the two types of used tomographs. (Author)

  9. Analytical methods for 2,4-D (Dichlorophenoxyacetic acid) determination; Metodos analiticos para la determinacion del 2,4-D (Acido diclorofenoxiacetico)

    Energy Technology Data Exchange (ETDEWEB)

    Martinez G, M.S.M

    1999-06-01

    The 2,4-D herbicide is one of the main pesticides for controlling the bad grass in crops such as the water undergrowth. In Mexico the allowed bound of this pesticide is 0.05 mg/l in water of 2,4-D so it is required to have methods trusts and exacts, which can used in order to detected low concentration of it. In this work we show some for the conventional techniques and for establishing the 2,4-D concentrations. The UV-Vis spectrometer and liquids chromatography due that they are the most common used nowadays. Beside, we introduce a now developed technique, which is based on the neutronic activation analysis. Though use of the UV-Vis spectrometer technique it was possible target the concentrations interval between 1 and 200 mg/l. In the liquids chromatography interval was between 0.1 and 0.9, and by the neutronic activation analysis the interval was between 0.01 and 200 mg/l. (Author)

  10. A model for the determination of the nominal potential for a linear accelerator; Un modelo para la determinacion del potencial nominal de un acelerador lineal

    Energy Technology Data Exchange (ETDEWEB)

    Gutt, F.; Silva, P.; Guerrero, R.; Diaz, J.; Colmenares, J. [Instituto Venezolano de Investigaciones Cientificas (IVIC), Laboratorio Secundario de Calibracion Dosimetrica (LSCD), Apartado 21827, Caracas 1020 A (Venezuela)

    1998-12-31

    The objective of the present work is to find a physical mathematical model based on the reason of the dose percentages at 10 and 20 cm depth, at 100 cm DFS and a 10 x 10 cm{sup 2} field. It was utilized literature data of new manufactured accelerators and those are in use in hospitals, which allow to prove the model under different conditions. Our objective consists only to obtain a model that verifies the nominal potential for a linear accelerator, but without pretending that such a model to be used to calculate any one factor to determination of absorbed dose. (Author)

  11. Determination of potassium by means of the {sup 40}K measurement; Determinacion de potasio mediante la medicion del {sup 40}K

    Energy Technology Data Exchange (ETDEWEB)

    Escareno J, E.; Vega C, H. R., E-mail: edmundoej@hotmail.com [Universidad Autonoma de Zacatecas, Unidad Academica de Estudios Nucleares, Cipres No. 10, Fracc. La Penuela, 98068 Zacatecas (Mexico)

    2011-11-15

    The concentration of total potassium through the gamma-rays measurement of 1461 KeV emitted during the disintegration of the {sup 40}K was determined. In the nature three isotopes of the K exist: {sup 39}K, {sup 41}K and {sup 40}K, this last is radioactive with a half life of 1.2 x 10{sup 9} years. The {sup 40}K isotope is in a relationship of 0.0117% with regard to the K, this characteristic is used with the purpose of estimating the total quantity of potassium. The potassium has a very important paper in the growth and the reproduction of animals and plants. Due to the secular equilibrium, the emission of {gamma}-rays is proportional to the concentration of K. In this work a group of calibration sources were prepared and a spectrometry system was characterized with NaI(Tl) to determine the concentration of total K. (Author)

  12. Development of Methodologies from Determination of Organic Components from Atmospheric Aerosol; Desarrollo de Metodologias para la Determinacion de Componentes Organicos del Aerosol Atmosferico

    Energy Technology Data Exchange (ETDEWEB)

    Pindado, O.; Perez, R.; Garcia, R.; Barrado, A. I.; Sevillano, M. L.; Gonzalez, D.

    2006-07-01

    It is presented method for the organic compound determination, such as n-alkanes, PAH's, alcohols and fatty acids that are comprised the particulate matter of aerosol. The procedure is based on sampling the particulate matter over quartz fibre filters that will be extracted by means of the Soxhiet technique, and later they will be divided by means of silicagel column. PAH's is analyzed by means of HPLCm whereas the rest is analyzed by GC-MS and for it, acids and alcohol must be previously derivatized with BSTFA.12 samples took shelter of fractions PMIO and PM2.5 of the aerosol of country side like application of the method. (Author) 60 refs.

  13. DETERMINACION DE LOS CONSTITUYENTES VOLÁTILES DE LA ALBAHACA (Ocimum spp MEDIANTE DOS MÉTODOS DE EXTRACCIÓN

    Directory of Open Access Journals (Sweden)

    Elizabeth Murillo Perea

    2010-10-01

    Full Text Available Se estudió la influencia de dos métodos de extracción: HIDRODESTILACIÓN (HD Y FLUIDO SUPERCRÍTICO (EES, en la composición química del aceite esencial de tres especies de albahaca: Ocimumamericanutn, O. basilicimiy O. mínimum. Los extractos fueron analizados por cromatografía de gases-espectrometría de masas (CG/EM. Al analizar comparativamente los constituyentes presentes, se encuentran diferencias cualitativas y cuantitativas. Los extractos supercríticos contienen compuestos de alto peso molecular, entre ellos esteres de linalol, presentes sólo en O.basilicum y O.mínimum. En estas especies el contenido de linalol en sus hidrodestilados es mayor que en los extractos supercríticos, indicando posible hidrólisis de los esteres en el proceso de HD. Para las tres especies se definió como quimiotipo "Cinamato de metilo", por ser el compuesto más abundante en todos los extractos. En O.basilicum y O.minimum se determinó además el subtipo "Cinamato de metilo > linalol", el cual no ha sido reportado en extractos de otros orígenes.

  14. Determination of the degradation constant and endogenous constant and endogenous respiration using a respirometric technique. Determinacion de la constante de degradacion y respiracion endogena mediante una tecnica respirometrica

    Energy Technology Data Exchange (ETDEWEB)

    Menendez Gutierrez, C.; Perez Olmo, J.

    1993-08-01

    Using the common basic equation for expressing the activated sludge process, it was established that where the sludge is more than 5 days old, employing the total biomass descomposition speed coefficient (kb) may lead to EDAR design errors. It should be replaced by the coefficient for the degradable biomass (kj) which is relatively quick and easy to determine. (Author) 5 refs.

  15. Determination of the dose around an ovoid for treatments in intracavitary brachytherapy Hdr; Determinacion de la dosis alrededor de un ovoide para tratamientos en braquiterapia intracavitaria HDR

    Energy Technology Data Exchange (ETDEWEB)

    Rivera M, T. [IPN, Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Legaria No. 694, Col. Irrigacion, 11500 Mexico D. F. (Mexico); Velasco V, R. A. E. [Hospital Central Militar, Periferico y Ejercito Nacional s/n, Lomas de Sotelo, 11200 Mexico D. F. (Mexico); Serrano F, A. K. [Hospital Juarez de Mexico, Av. Instituto Politecnico Nacional No. 5190, Col. Magdalena de las Salinas, 03220 Mexico D. F. (Mexico); Azorin N, J., E-mail: trivera@ipn.m [Universidad Autonoma Metropolitana, Unidad Iztapalapa, Av. San Rafael Atlixco No. 186, Col. Vicentina, 09340 Mexico D. F. (Mexico)

    2010-09-15

    On this work the results of the dosimetric measurements are presented around an ovoid of 2 cm diameter. The measurements were carried out using a water mannequin, an ovoid, a radiation gamma source of {sup 192}Ir and thermoluminescent dosemeters. The dosimetry was realized in the direction of the rectum and bladder. To know the effect of the shielding of the devices type Manchester in the dose, the thermoluminescent dosemeters were irradiated to a radiation gamma source of {sup 192}Ir contained in the Gamma med Plus equipment. The planning was realized normalizing the calculation to 2.5 cm from the applicator center on the transverse plane (2.5, 0, 0). The results show that the dose distribution for an ovoid without shielding is more uniform in the transversal plane to the source axis. The results were compared with the calculated results by means of the planning system BrachyVision. While the absorbed dose distribution around an ovoid with shielding is completely anisotropic. This anisotropic is due to the shielding. (Author)

  16. Determination of Sn in 99{sup m}Tc Radiopharmaceutical Kits by Polarographic Methods; Determinacion de Estano en Radiofarmacos de 99{sup m}Tc mediante Metodos Polarograficos

    Energy Technology Data Exchange (ETDEWEB)

    Castro, M.; Cruz, J.; Sanchez, M.

    2009-07-01

    Kits of 99{sup m}Tc radiopharmaceuticals are used in nuclear medicine for diagnosis of different diseases. Sn (II) is one of the essential components in their formulations, which is used for reduction 99{sup m}Tc-pertechnetate in cold kits for on-site preparation 99{sup m}Tc-pertechnetate radiopharmaceuticals. Usually, these cold kits contain different additives (complexing agents, antioxidants, buffers, etc.) and the amount of Sn (II) varies from kit to kit. The determination of Sn in these products is essential in assessing their quality. We report here the development of a new polarographic method for the determination of Sn (II) and total Sn in representative radiopharmaceuticals kits (for the content of Sn and chemical composition) produced at the Center of Isotopes of Cuba (CENTIS). These methods were validated by analysis of variance and recovery techniques. From the results of the validation, the characteristic functions of uncertainties and fits are considered for the established methods, which give the necessary evidences to demonstrate the usefulness of these methods according to the current trends in Analytical Chemistry. This work provides practical results of great importance for CENTIS. After the speciation of Sn in the MAG3 radiopharmaceuticals kit is inferred that the production process is affected by uncontrolled factors that influence in the product stability, which demonstrates the necessity for analytical tools for the characterization of products and processes. (Author) 57 refs.

  17. Determination of radiation levels by neutrons in an accelerator for radiotherapy; Determinacion de niveles de radiacion por neutrones en un acelerador para radioterapia

    Energy Technology Data Exchange (ETDEWEB)

    Paredes G, L.; Salazar B, M.A. [Instituto Nacional de Investigaciones Nucleares, Apdo. Postal 18-1027, 11801 Mexico D.F. (Mexico); Genis S, R. [Fundacion Clinica Medica Sur, Puente de Piedra 150, Col. Torriello Guerra, Tlalpan 14050, Mexico D.F. (Mexico)

    1998-12-31

    It was determined the radiation levels by neutrons due to photonuclear reactions ({gamma}, n) which occur in the target, levelling filter, collimators and the small pillow blinding of a medical accelerator Varian Clinac 2100C of 18 MeV, using thermoluminescent dosemeters UD-802AS and US-809AS. The experimental values were presented for the patient level, inside and outside of the radiation field, as well as for the small pillow. (Author)

  18. Determination of {sup 40} K in food and whole body; Determinacion de {sup 40} K en alimentos y en cuerpo entero

    Energy Technology Data Exchange (ETDEWEB)

    Quintero P, E.; Alfaro L, M.M.; Valentin A, G.; Rojas M, V.P. [ININ, 52750 La Marquesa, Estado de Mexico (Mexico)

    2007-07-01

    We present the concentration of radioactivity of {sup 40}K, in samples of some foods consumed by the population settled down in the area of influence of the Nuclear Center of Mexico, using the foods more representative of this area. We also present the concentration of this radioisotope in the human body classified by ages and sex. (Author)

  19. Simultaneous determination of Cr, Ni and V in urine by electrothermal atomic absorption spectrometry (ET AAS); Determinacion simultanea de Cr, Ni y V en orina mediante et aas

    Energy Technology Data Exchange (ETDEWEB)

    Alvarez, Maria A.; Hermida, Jeymi [Universidad Central de Venezuela, Caracas (Venezuela, Bolivarian Republic of). Escuela de Quimica. Centro de Quimica Analitica

    2011-07-01

    A procedure for the simultaneous determination of Cr, Ni, and V in urine by electrothermal atomic absorption spectrometry (ET AAS) was optimized by factorial design, and performed at a pyrolysis and atomization temperatures of 1300 and 2500 deg C, respectively, using 15 {mu}g de Mg(NO{sub 3}){sub 2} as chemical modifier. Characteristics mass of 14, 6 and 220 {rho}g and detection limits of the method of 0.07, 0.38 and 0.75 {mu}g L{sup -1} were obtained for Cr, Ni and V respectively. The methodology was validated using a Liphochek Urine Metals Control sample (Bio-Rad) (P=0.05). The methodology was applied to samples of voluntary Venezuelan people, not environmentally exposed to specific emissions, and results ranging from < LOD-1.1 and 1.3-3.3 {mu}g L{sup -1} was observed for Cr and V, respectively, and not detectable levels for Ni. (author)

  20. Spectrophotometric determination of zinc in impure solutions; Determinacion Espectrofotometrica de Zinc en muestras de rio-Tinto prvia estracciond el Ditizonato con Tetracloruro

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez Hernandez, B.; Reyes Tamaral, A.

    1972-07-01

    A dithizone colorimetric method is described for determining zinc concentrations of 0.001 to 5 g/l in aqueous solutions from Rio Tinto Mines, containing copper, iron and other impurities. Citrate, cyanide and bis-(2hydroxyethyl)-dithiocarbamate are added to the aqueous sample of masking several metals, and zinc is extracted at pH 5 with a solution of dithizone in carbon tetrachloride. Excess of dithizone is removed with sodium sulphide, and optical density of zinc dithionate in organic solution is measured at 5.35 nm. Calibration curves obey Beer's law up to 0.5 micro Zn/ml. (Author) 5 refs.

  1. Determinacion de la bioactividad y la resistencia a la compresion de bloques de Poliapatita Determination of the bioactivity and the compression resistance of Poliapatita

    Directory of Open Access Journals (Sweden)

    Haney Castro Fernández

    2010-01-01

    Full Text Available Poliapatita® is a composite in study formed by HAP-200®, CaCO3 and POVIAc®. The aims of this work were the determination of the bioactivity and the compression resistance (CR of biomaterial. The composite was put in contact with a Simulated Body Fluid (28 days at 37 ºC to evaluate the formation of an superficial apatite layer similar to the bone mineral composition; and to see how diminished the CR in conditions similar to implantation. The bioactivity was evaluated mainly by Scanning Electron Microscopy, Energy-dispersive X-ray Spectroscopy. The composite studied was bioactive and fulfills the requierement of CR asked by ISO 13779-1:2001.

  2. An Optimised Method to Determine PAHs in a Contaminated Soil; Metodo Optimizado para la Determinacion de PAHs en un Suelo Contaminado

    Energy Technology Data Exchange (ETDEWEB)

    Garcia Alonso, S.; Perez Pastor, R. M.; Sevillano castano, M. L.; Escolano Segovia, O.; Garcia Frutos, F. J.

    2007-07-20

    An analytical study is presented based on an optimised method to determine selected polycyclic aromatic hydrocarbons (PAHs) by High Performance Liquid Chromatography (HPLC) with fluorescence detection. The work was focused to obtain reliable measurements of PAH in a gas work contaminated soil and was performed in the frame of the project 'Assessment of natural remediation technologies for PAHs in contaminated soils' (Spanish Plan Nacional l+D+i, CTM 2004-05832-CO2-01): First assays were focused to evaluate an initial proposed procedure by sonication extraction in the contaminated soil. Afterwards to extend the efficiency and reduce solvent and time consuming of extraction procedures, the more relevant parameters that affect the extraction step were investigated. A comparison between sonication and microwave procedures was done, and the influence of sample grinding was studied. In general, both extraction techniques led on comparable results, although sonication procedure needs to be more carefully optimised. Finally, as a final application of the optimised method, the effect of particle size on relative distribution of selected PAHs in the contaminated soil was investigated. Relative abundance of more volatile PAHs showed a decreasing according to lower grain size, while relative abundance of less volatile compounds indicated an increasing of concentration levels for lower grain size. (Author) 10 refs.

  3. Methods of Uranium Determination in solutions of Tributyl Phosphate and Kerosene; Metodos de determinacion de uranio en soluciones de fosfato de tributilo y queroseno

    Energy Technology Data Exchange (ETDEWEB)

    Petrement Eguiluz, J.; Palomares Delgado, F.

    1962-07-01

    A new analytical method for the determination of uranium in organic solutions of tributyl phosphate and kerosene is proposed. In this method the uranium is reectracted from the aqueous phase by reduction with cadmium in acid solution. The uranium can be determined in this solution by the usual methods. In case of very diluted solutions, a direct spectrophtometrical determination of uranium in the organic phase with dibenzoylmethane is proposed. (Author) 21 refs.

  4. Analytical Comparison of Miniaturized Methods for Selected PAH Determination in Clean Waters; Comparacion Analitica de 4 Metodos Miniaturizados de Determinacion de PAHs mediante HPLC en Aguas

    Energy Technology Data Exchange (ETDEWEB)

    Garcia, S.; Perez, R. M.; Fernandez, O.

    2012-04-11

    A study on the comparison and evaluation of 4 miniaturized extraction methods for the determination of selected PAHs in clear waters is presented. Four types of liquid-liquid extraction were used for chromatographic analysis by HPLC/ FD. The main objective was the optimization and development of simple, rapid and low cost methods, minimizing the use of extracting solvent volume. The work also includes a study on the scope of the methods developed at low and high levels of concentration. (Author) 13 refs.

  5. Experimental petrology for the thermobarometric determination of mineral paragenesis: the fluid inclusions; Petrologia experimental para la determinacion termobarometrica de paragenesis minerales: las inclusiones fluidas

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez Partida, Eduardo; Torres Rodriguez, Vicente; Birkle, Peter [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1994-05-01

    There is a great number of phenomena in nature in which some fluid participates as the main component. Such is the case of oil deposits formation, of metallic minerals, geothermal systems, metamorphic and diagenetic deposits. The common denominator of all of them is that in some part of their stages important physico-chemical processes occurred in the related fluids, leaving evidence of such phenomena in the fluid inclusions. The Geothermal Department has petrologic vanguard tools for reservoir problems resolution, since it has laboratories for the study on fluid inclusions by means of the technique called cryoscopic-microthermometry that permits the definition of physico-chemical conditions of the brine that participated or participates in the hydrothermal systems formation. The method simultaneously permits to know the characteristics of the initial brine that participated in the interaction water-rock phenomenon, observe the boiling phenomena, and determine conditions of initial pressure in the reservoirs. [Espanol] Existe un gran numero de fenomenos en la naturaleza en los que participa algun fluido como componente principal. Tal es el caso de la formacion de yacimientos de petroleo, de minerales metalicos, de sistemas geotermicos, yacimientos metamorficos y diageneticos. El comun denominador de todos ellos es que en alguna de sus etapas ocurrieron procesos fisicoquimicos importantes en los fluidos relacionados, quedando evidencia de tales fenomenos en las inclusiones fluidas. El Departamento de Geotermia cuenta con herramientas petrologicas de vanguardia para la resolucion de problemas en yacimientos, ya que tiene laboratorios para el estudio de las inclusiones fluidas por medio de la tecnica denominada microtermometria-crioscopica que permite definir condiciones fisicoquimicas de la salmuera que participo o participa en la formacion de sistemas hidrotermales. El metodo permite simultaneamente conocer las caracteristicas de la salmuera inicial que participo en el fenomeno de interaccion aguaroca, observar fenomenos de ebullicion y determinar condiciones de presion inicial en los yacimientos.

  6. Biological assay of chromatin dispersal simplified for determining absorbed dose of ionizing radiation; Ensayo biologico simplificado de dispersion de cromatina para la determinacion de dosis de radiacion ionizante

    Energy Technology Data Exchange (ETDEWEB)

    Galaz, S.; Perez, G.; Stockert, J. C.; Blazquez-Castro, A.

    2011-07-01

    Currently, the production of nuclear halos chromatin dispersion methods is a good procedure for nuclear analysis by in situ hybridization (Wiegant et al., 1992, Gerdes et al. 1994), to detect apoptosis, DNA fragmentation and cell death rates in cell cultures (Fernandez et al., 2005, Enciso et al. 2006). It is customary to display the nuclear halos by fluorescence microscopy using propidium iodide, ethidium bromide or DAPI (Gerdes et al., 1994, Sestili et al. 2006). Using this technique based on a modified protocol of fast halo assay [FHA],(Sestili et al. 2006), has developed a simplified method to quantify the cytogenetic damage induced by ionizing radiation (dispersion test chromatin in agarose thin smear), which allows visualization of halos after staining for light microscopy or fluorescence and correlating the ratio: total area occuped by the halo nucleus / nucleus (halo-core index [IHN] ) with radiation dose.

  7. Determination of effective dose for workers hemodynamics service using double dosimetry; Determinacion de la dosis efectiva para los trabajadores del servicio de hemodinamica usando doble dosimetria

    Energy Technology Data Exchange (ETDEWEB)

    Ruiz Lopez, M. A.; Lobato Munoz, M.; Jodar Lopez, C. A.; Ramirez Ros, J. C.; Jerez Sainz, M. I.; Pamos Urena, M.; Carrasco Rodriguez, J. L.

    2013-07-01

    The use of an additional dosimeter at the level of the neck above the lead apron we can provide an indication of the dose in the head (the Crystal dose). In addition, it is possible to combine the two readings of the dosimeter to provide an improved estimate of the effective dose. In the hemodynamics service of our Hospital we have maintained a worker for 3 years with the double dosimetry read monthly. With the readings from these dosimeters will do following algorithms, several estimates of the effective dose to see if, with working conditions that occur in this service, it would be necessary to extend this practice to the rest of the workers to get a better estimation of effective dose. (Author)

  8. Determination of the extinction factor in function of the density of dislocations; Determinacion del factor de extincion en funcion de la densidad de dislocaciones

    Energy Technology Data Exchange (ETDEWEB)

    Macias B, L.R

    1991-12-15

    There are exist three basic types of crystalline lattice defects: point, line (or dislocations) and surface defects. Such defects may be incorporated intentionally to produce desired mechanical and physical properties. This report presents a FORTRAN language program to calculate the extinction factor in samples of polycrystalline copper as function of the dislocations density. (Author)

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

    Energy Technology Data Exchange (ETDEWEB)

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

    1995-02-01

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

  10. Determination of the response of a NaI(Tl) detector; Determinacion de la respuesta de un detector de NaI(Tl)

    Energy Technology Data Exchange (ETDEWEB)

    Vega C, H.R.; Manzanares A, E.; Hernandez D, V.M.; Chacon R, A. [Universidad Autonoma de Zacatecas, A.P. 336, 98000 Zacatecas (Mexico)]. e-mail: fermineutron@yahoo.com

    2006-07-01

    By means of Monte Carlo calculations it was determined the response of a scintillator of NaI (Tl) of 7.62 {phi} x 7.62 cm to monoenergetic gamma rays of 0.2 to 3.5 MeV. The response allows to determine the spectra of height of pulses of the monoenergetic photons. This type of calculations was also carried out for photons emitted by sources of Cs-137, Co-60, Na-22, Na-24 and {sup 239} PuBe, with the purpose of reproducing the gamma spectra obtained with this type of detecting. In the calculations the detector was modelled as a NaI cylinder with Al cover and the base of lucite; due to the absence of reliable information on the quantity of thallium in the calculations this information was omitted: for photons whose energy is greater to 1.022 MeV the presence of the gamma peak of the simple escape and twice is observed. The source was modelled as punctual and was located to 5 cm along the axial axis of the detector. To verify the calculations its were carried out measurements with a spectrometer with a scintillator of 7.62 {phi} x 7.62 cm. In the measured spectra the sum peak is observed, while in those calculated it doesn't appear; because the simultaneous detection of photons of different energy doesn't happen each photon since, in single form, it is followed until its complete absorption in the scintillator or when it escapes from the volume of the detector. To reproduce the sum peak and to obtain height spectra of pulses similar to those measured, the sum photons were introduced in the calculations. With the purpose of that Monte Carlo calculation it reproduces the scattering around the photopeak it was used a gaussian function in each photopeak whose characteristics were obtained starting from the experimental data. The calculation of the response of a scintillator allows to establish the capacity of the measurement of the gamma radiation as well as to distinguish the real events of those that appear by the limitations of the detection process. (Author)

  11. Determinacion de parámetros y simulación matemática del proceso de secado de cacao (Theobroma cacao

    Directory of Open Access Journals (Sweden)

    Fanny Villamizar de Borrero

    2011-06-01

    Full Text Available Estudio sobre la producción de cacao en Colombia, y el incremento notable, debido principalmente al aumento en el área cultivada y a los mayores rendimientos por hectárea obtenidos.

  12. Determining the activity of transuranic in granulometric fractions of contaminated soils; Determinacion de la actividad de transuranicos en las fracciones granulometricas de tierras contaminadas

    Energy Technology Data Exchange (ETDEWEB)

    Saez Vergara, J. C.; Aragon del Valle, A.; Correa Garces, E.; Burgos Garcia, D.; Lanzas Sanchez, M. R.; Hervella Blazquez, M.; Sancho Llerandi, C.

    2011-07-01

    This paper presents the experimental media and some results obtained by the Unit of radiologically contaminated land reclamation (URTRC) of CIEMAT in the characterization of soils contaminated with Pu and Am.

  13. Spectrophotometric method for the determination of thorium in UO{sub 2} pellets; Metodo espectrofotometrico para la determinacion de torio en pastillas de UO{sub 2}

    Energy Technology Data Exchange (ETDEWEB)

    Acosta L, E. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)]. e-mail: eal@nuclear.inin.mx

    1995-04-15

    This report presents a procedure with the description of the spectrophotometric method for the determination of the thorium element in uranium products including powders and pellets of uranium dioxide. Quantities can be determined starting from 1 ppm. (Author)

  14. Determination of uranium traces in fuel cans of nuclear reactors; Determinacion de trazas de uranio en vainas de combustible de reactores nucleares

    Energy Technology Data Exchange (ETDEWEB)

    Acosta L, C.E.; Benavides M, A.M.; Sanchez P, L.A.; Nava S, G.F. [Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    1997-07-01

    The objective of this work is to quantify the uranium content that as impurity can be found in zircon and zircaloy alloys which are used in the construction of fuel cans. The determination of this serves as a quality control measure due to that the increment of uranium content in alloy, diminishing the corrosion resistance. The fluorimetric method was used to do this determination. It is a very sensitive, reliable, rapid method also high reproducibility and repeatability as well as low detection limits (0.25 mg/kg). (Author)

  15. Ley natural, determinatio y derecho positivo: Lo indiferente y las determinaciones del legislador Natural law, determinatio and positive law: The indifferent and the determinations of the legislator

    Directory of Open Access Journals (Sweden)

    Sebastián Contreras Aguirre

    2011-09-01

    Full Text Available Uno de los tópicos principales de la teoría clásica del derecho natural es el de la relación entre derecho natural y positivo. Para todos los autores clásicos, el derecho positivo encuentra su origen en los principios universales del derecho, que Santo Tomás ha llamado lex naturalis. Pero estos principios universales del derecho son tan generales e inespecíficos, que para formar parte de un ordenamiento jurídico concreto (en una comunidad política concreta necesitan de alguna especificación. Este modo de «especificar» los preceptos naturales de moralidad es lo que se llama determinación, que es el tema de nuestro trabajo.One of the main topics of classical iusnaturalism is the relation between natural law and positive law. For all the classics, positive law originates from the universal principles of law, that Aquinas calls lex naturalis. But these universal principles of law are so general and nonspecific, that to be part of a particular justice system (in a particular political community needs some specification. This form of «specify» the natural precepts of morality is called determination, that is the topic of our work.

  16. Spectrophotometric Determination of Microamounts of Uranium previous Extraction with TBP-MIC; Determinacion Espectrofotometrica de Microcantidades de Uranio previa extraccin con Metilisobutilcetona-Fosfato de Tributilo

    Energy Technology Data Exchange (ETDEWEB)

    Vera Palomino, J.; Palomares Delgado, F.; Petrement, J.; Fernandez Cellini, R.

    1962-07-01

    Selective extraction of uranium in nitric acid medium with a mixture of Tbp-MIC (1:10) has been achieved. Aluminium nitrate was used as salting agent. Complexing agents were added in order to avoid extraction of impurities. Extraction conditions have been studied so that extraction is almost practically complete in a single run. (Author) 19 refs.

  17. Determination of the components of uncertainty for a dosimetry system in radiation protection; Determinacion de las componentes de incertidumbre para un sistema de dosimetria en radio proteccion

    Energy Technology Data Exchange (ETDEWEB)

    Lopez, F., E-mail: flopez@unan.edu.ni [Universidad Nacional Autonoma de Nicaragua, Managua (Nicaragua); Cabral, T.S.; Peixoto, J.G. [Instituto de Radioprotecao e Dosimetria (IRD/CNEN-RJ), Rio de Janeiro, RJ (Brazil)

    2013-07-01

    This work is about the theoretical calculation of uncertainties associated to the dosimetry of photons of a {sup 137}Cs source that will be used in a Dosimetry Laboratory. In this case recognition of the influence quantities that provide most uncertainty and the right choice of resolution of auxiliary equipment to obtain the smallest uncertainties according to the laboratory. (author)

  18. Validação de um modelo teórico usado no cuidado da família que tem um filho com cardiopatia Validación de un modelo teórico usado en el cuidado de la familia con un hijo con cardiopatia Validation of a theoretical model applied on the care of families with a child with cardiopathy

    Directory of Open Access Journals (Sweden)

    Yelma Jacob

    2006-09-01

    Full Text Available Validar o modelo teórico"Buscando preservar a integridade da unidade familiar"; aplicando-o à situação da família que vivencia a situação. A coleta de dados decorreu por meio de entrevistas com seis familiares que vivenciaram a experiência de ter um filho que sofreu uma intervenção cirúrgica cardíaca, cujas perguntas foram pautadas no referido modelo, tendo como foco a experiência familiar, durante o tempo da cirurgia cardíaca. Os dados gerados foram analisados de acordo com a Teoria Fundamentada nos Dados. Pela análise comparativa dos resultados dos dois estudos, foi possível validar o modelo teórico para a experiência da família que vivencia a cirurgia cardíaca do filho. Em função da natureza específica da experiência, dois novos temas emergiram: vivendo uma experiência solitária e tendo superado uma etapa, ampliando o modelo teórico original.Validar el modelo teórico "Buscando preservar la integridad de la unidad familiar"; aplicándolo a la situación de la familia que vivencia la situación de cirugía cardiaca de un hijo. La recolección de datos se llevó a cabo por medio de entrevistas a seis familiares que vivenciaron la experiencia de tener un hijo que sofrió una intervención quirúrgica cardiaca, cuyas preguntas fueron basadas en el referido modelo, teniendo como foco la experiencia familiar, durante el tiempo de la cirugía cardiaca. Los datos generados fueron analizados de acuerdo con la Teoría Fundamentada en los Datos. Resultados - Por el análisis comparativo de los resultados de los dos estudios, fue posible validar el modelo teórico para la experiencia de la familia que vivencia la cirugía cardiaca del hijo. En función de la naturaleza específica de la experiencia, emergieron dos nuevos temas: viviendo una experiencia solitaria y habiendo superado una etapa, ampliando así el modelo teórico original.This article is based on a survey aimed at validating the theoretical model "Trying to preserve the integrity of the family unit" by applying it to the situation of families living through the experience of having a child undergoing heart surgery. Data was collected through interviews with six family members who had gone through that experience. The questions were laid out according to the model, focusing on the family experience during the time of heart surgery. The data was analyzed according to the Grounded Theory. Results showed that it is possible to validate the theoretical model for the experience of families who had a child undergoing heart surgery through the comparative analysis of the results of both studies. Because of the specific nature of the experience, two new themes emerged: living a lonely experience and overco-ming a phase, thus widening the original theoretical model.

  19. Determination of {sup 2}30Th (Ionium) in uranium ores and wastes from uranium reprocessing. IV. Calculation of ionium separation yield; Determinacion de {sup 2}39Th (Ionio) en minerales y residuos del procesado de Uranio. IV: Determinacion del rendimiento en la separacion del {sup 2}30 Th

    Energy Technology Data Exchange (ETDEWEB)

    Galiano Sedano, J. A.; Acena Barrenechea, M. L.

    1974-07-01

    For determining ionium ({sup 2}30Th) in minerals and uranium processing wastes by precipitation with fluorhidric acid, using lanthanum as carrier, and selective extraction with tenoytrifluoroacetone (TTA) followed by radiometric determination of the isolated nuclide, it is necessary the use of a tracer since the chemical yield of the separation ranges between wide limits. In this paper, the use of the beta-emitter {sup 2}34Th as the most convenient tracer is discussed. Equations are derived for correcting for counting errors introduced by other thorium isotopes which are present either in the sample or in the tracer, as well as for calculating the chemical yield of the separation. These equations have been experimentally checked by ionium determinations carried out with different types of samples. (Author) 18 refs.

  20. Doenças periodontais em pacientes com doença isquêmica coronariana aterosclerótica, em Hospital Universitário Periodontal disease in patients with ischemic coronary atherosclerosis at a University Hospital

    OpenAIRE

    Ana Lúcia Azevedo Barilli; Afonso Dinis Costa Passos; José Antônio Marin-Neto; Laércio Joel Franco

    2006-01-01

    OBJETIVO: Verificar a freqüência das doenças periodontais (DP) em pacientes com cardiopatia isquêmica. As DP representam grave problema de saúde pública odontológica, com distribuições diferenciadas quanto a gravidade, faixa etária, tipo de infecção, comorbidades e fatores de risco. MÉTODOS: Foram examinados 480 pacientes no Ambulatório de Cardiopatia Isquêmica do Hospital das Clínicas da Faculdade de Medicina de Ribeirão Preto da Universidade de São Paulo, e 154 pacientes sem cardiopatia na ...

  1. Determination of concentration of radon, volatile organic compounds (VOC) and water chemistry in springs near to Popocatepetl volcano; Determinacion de la concentracion de radon, VOCs y Quimica del agua en manantiales cercanos al volcan Popocatepetl

    Energy Technology Data Exchange (ETDEWEB)

    Pena, P.; Segovia, N.; Lopez M, B.E.; Cisniega, G. [ININ, A.P. 18-1027, 11801 Mexico D.F. (Mexico); Valdes, C.; Armienta, M.A.; Mena, M. [Instituto de Geofisica, UNAM, 04510 Mexico D.F. (Mexico)

    2004-07-01

    Popocatepetl volcano is a high-risk active volcano in Central Mexico where the highest population density in the country is settled. Radon in the soil and groundwater together with water chemistry from samples of nearby springs is analysed as a function of the 2002-2003 volcanic activity. Soil radon indicated fluctuations related both the meteorological parameters and sporadic explosive events. Groundwater radon showed essentially differences in concentration due to the specific characteristics of the studied springs. Water chemistry showed stability along the monitoring period indicating also differences between springs. No anthropogenic pollution from volatile organic compounds was observed. (Author)

  2. Geological determination of the limits, area and volume of the geothermal reservoir of the Los Humeros geothermal field, Puebla, Mexico; Determinacion geologica de los limites, area y volumen del yacimiento geotermico de Los Humeros, Puebla, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Castillo Hernandez, Daniel [Gerencia de Proyectos Geotermoelectricos, Comision Federal de Electricidad, Morelia, Michoacan (Mexico)

    1999-08-01

    A geologic analysis to determine the limits, area and volume of the exploitable reservoir of the Los Humeros Geothermal Field, in Puebla, Mexico was carried out. We defined the structural boundaries, both at surface and at deep that seem to control the distribution of the fluids of high enthalpy and favor or limit the production of steam. With 40 wells drilled to date, an average thickness of the lithological producer Unit of 1 163 m has been estimated. A surface of 12.54 km{sup 2} was calculated, that with the estimated thickness, gives a volume of the reservoir of 14.6 km{sup 3}. We consider that there are two main production sectors in the Geothermal Field: The Central Collapse and The Mastaloya Corridor. [Spanish] Se realizo un analisis geologico para determinar los limites, area y volumen del yacimiento explotable del campo geotermico de Los Humeros en Puebla, Mexico. Se definen las barreras estructurales, tanto superficiales como del subsuelo, que controlan la distribucon de los fluidos de alta entalpia que favorecen o limitan la produccion de vapor. Con los 40 pozos perforados hasta la fecha, se estima un espesor promedio de la unidad productora de 1 163 m. Se calculo una superficie de 12.54 km{sup 2}, la que con el espesor mencionado, da un volumen del yacimiento de 14.6 km{sup 3}. Se plantea que dentro del campo existen dos sectores principales de produccion. El Colapso Central y el Corredor de Mastaloya.

  3. The radioactive equilibrium and determination methods for ratio e Ra/U; Desequilibrio Radiactivos-1. Metodo {sub {beta}}-{gamma}. Determinacion de la razon eRa/U. Valoracion del contenido en U{sub 3}O{sub 8}

    Energy Technology Data Exchange (ETDEWEB)

    Mingarro, E.

    1966-07-01

    The main problems concerning the radioactive non-equilibrium on minerals and a simultaneous counting procedure for {beta}- and {gamma}- activities developed to solve those problems, are described. (Author)

  4. Natural radioactivity levels and danger ratio in cements, concretes and mortars used in construction; Determinacion de niveles radiactivos naturales e indices de peligrosidad en cementos, hormigones y morteros utilizados en construccion

    Energy Technology Data Exchange (ETDEWEB)

    Meneses, J.; Pacheco, C.; Avila, J. M.; Miro, C.

    2010-07-01

    We have determined the natural radiation level in three types of adhesive cements, five types of concrete and two types of mortars of different strength normally used in the construction field. Of these materials, both concrete and mortars were prepared in our laboratories, cements the contrary were of a commercial nature.

  5. Determining the sustainability of ceramic and glass industry using environmental management tools; Determinacion de la sostenibilidad de la industria mineral de la ceramica y del vidrio mediante herramientas de gestion ambiental

    Energy Technology Data Exchange (ETDEWEB)

    Espi Rodriguez, J. A.

    2011-07-01

    In the last few years we have seen the creation of an everyday larger and varied series of are creating large and varied series of environmental management tools used to analyze and classify environmentally each mineral and its physical, economic and environmental circumstances. Thus we now, count with the Material Flow Analysis (MFA) of a mining operation, the Life Cycle Analysis (LCA), Energy and Exergy Analysis, Cost Benefit Environmental Analysis, Carbon Footprints, the Best Available Technology (BTA) and many others able to analyze and classify ore deposit site types, availability of resources, environmental impact conditions, transparency in communication and almost all crucial aspects related with the environmental geometry of the mining production process. This paper focuses on the application of some management tools that best fit to the minerals used in the ceramic and glass industry. (Author) 12 refs.

  6. Determination of silver, gold, zinc and copper in mineral samples by various techniques of instrumental neutron activation analysis; Determinacion de plata, oro, zinc y cobre en muestras minerales mediante diversas tecnicas de analisis por activacion de neutrones instrumental

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez R, N. I.; Rios M, C.; Pinedo V, J. L. [Universidad Autonoma de Zacatecas, Unidad Academica de Estudios Nucleares, Cipres No. 10, Fracc. La Penuela, 98068 Zacatecas, Zac. (Mexico); Yoho, M.; Landsberger, S., E-mail: neisla126@hotmail.com [University of Texas at Austin, Nuclear Engineering Teaching Laboratory, Austin 78712, Texas (United States)

    2015-09-15

    Using the method of instrumental neutron activation analysis, mineral exploration samples were analyzed in order to determine the concentrations of silver, gold, zinc and copper; these minerals being the main products of benefit of Tizapa and Cozamin mines. Samples were subjected to various techniques, where the type of radiation and counting methods were chosen based on the specific isotopic characteristics of each element. For calibration and determination of concentrations the comparator method was used, certified standards were subjected to the same conditions of irradiation and measurement that the prospecting samples. The irradiations were performed at the research reactor TRIGA Mark II of the University of Texas at Austin. The silver concentrations were determined by Cyclical Epithermal Neutron Activation Analysis. This method in combination with the transfer pneumatic system allowed a good analytical precision and accuracy in prospecting for silver, from photo peak measurement 657.7 keV of short half-life radionuclide {sup 110}Ag. For the determination of gold and zinc, Epithermal Neutron Activation Analysis was used, the photo peaks analyzed corresponded to the energies 411.8 keV of radionuclide {sup 199}Au and 438.6 keV of metastable radionuclide {sup 69m}Zn. On the other hand, copper quantification was based on the photo peak analysis of 1039.2 keV produced by the short half-life radionuclide {sup 66}Cu, by Thermal Neutron Activation Analysis. The photo peaks measurement corresponding to gold, zinc and copper was performed using a Compton suppression system, which allowed an improvement in the signal to noise relationship, so that better detection limits and low uncertainties associated with the results were obtained. Comparing elemental concentrations the highest values in silver, zinc and copper was for samples of mine Tizapa. Regarding gold values were found in the same range for both mines. To evaluate the precision and accuracy of the methods used, various geological reference materials with satisfactory results according to the certified values were analyzed. (Author)

  7. Determination of Carbon-14 in environmental samples by mixing 14CO{sub 2} with a liquid scintillator; Determinacion de carbono-14 en muestras ambientales por incorporacion de 14CO{sub 2} a un centelleador liquido

    Energy Technology Data Exchange (ETDEWEB)

    Garcia, M. R.; Gomez, V.; Heras, M. C.; Beltran, M. A.

    1990-07-01

    A method for the determination of Carbon-14 (14CO2) in environmental samples has been developed. The method use the direct absorption of the carbon dioxide into Carbosorb, followed with incorporation of the mixture (Carbosorb-CO2) to the liquid scintillator. The results obtained to apply this method and the benzene synthesis, usual in our laboratory, are discussed and compared. The method of collection of atmospheric samples is also described. (Author) 10 refs.

  8. An Evaluation of Uncertainty Associated to Analytical Measurements of Selected Polycyclic Aromatic Compounds in Ambient Air; Estudio sobre las Incertidumbres Asociadas al Metodo de Determinacion de PAC's Seleccionados en Muestras de Aire Ambiente

    Energy Technology Data Exchange (ETDEWEB)

    Barrado, A. I.; Garcia, S.; Perez, R. M.

    2013-06-01

    This paper presents an evaluation of uncertainty associated to analytical measurement of eighteen polycyclic aromatic compounds (PACs) in ambient air by liquid chromatography with fluorescence detection (HPLC/FD). The study was focused on analyses of PM{sub 1}0, PM{sub 2}.5 and gas phase fractions. Main analytical uncertainty was estimated for eleven polycyclic aromatic hydrocarbons (PAHs), four nitro polycyclic aromatic hydrocarbons (nitro-PAHs) and two hydroxy polycyclic aromatic hydrocarbons (OH-PAHs) based on the analytical determination, reference material analysis and extraction step. Main contributions reached 15-30% and came from extraction process of real ambient samples, being those for nitro- PAHs the highest (20-30%). Range and mean concentration of PAC mass concentrations measured in gas phase and PM{sub 1}0/PM{sub 2}.5 particle fractions during a full year are also presented. Concentrations of OH-PAHs were about 2-4 orders of magnitude lower than their parent PAHs and comparable to those sparsely reported in literature. (Author) 7 refs.

  9. Determination of kinetic parameters in Tl dosemeters of LiF: Mg, Cu, P + PTFE developed in the ININ; Determinacion de parametros cineticos en dosimetros Tl de LiF: Mg, Cu, P + PTFE desarrollados en el ININ

    Energy Technology Data Exchange (ETDEWEB)

    Basurto G, B.S

    2002-07-01

    The objective of this work, is the one of determining the kinetic parameters of the dosemeter of LiF: Mg, Cu, P + Ptfe; starting from the curves Tl obtained at being irradiated with alpha radiation ({alpha}), beta ({beta}) and gamma ({gamma}). As like to compare its sensitivity with each radiation type, considering the sensitivity of the TLD-100 as the unit. In the Chapter 1, the fundamental structure of the matter is described, making emphasis in the different radiation types, and their interaction with this. In the Chapter 2, the units are described but used in the dosimetry of the radiation. In the Chapter 3, the basic concepts of the phenomenon of Tl are described and those are explained characteristic of the deconvolution method to determine the kinetics of the one phenomenon. In the Chapter 4, the methodology is detailed that was used in the elaboration of this thesis work, describing the material Tl that were considered like reference, as well as the sources of ionizing radiation, with those that the dosemeters were irradiated and the equipment in the one that the curves Tl was obtained. Reference is made to the software used to carry out the deconvolution of the curves Tl that were obtained in the one experimental development. In the Chapter 5, the obtained results of this study are presented, showing the tables of homogenization of dosemeters and the reading of the same one; they are observed the curves Tl obtained to different radiation doses (alpha, beta and gamma), the intensity Tl in function of the dose. Also they are tabulated, the obtained results in the kinetic parameters of the three different study materials (TLD-100H, USA; TLD-100, USA and LiF: Mg, Cu, P + Ptfe developed in the l.N.l.N). They are analyzed shortly for each material Tl their sensitivity to the ionizing radiation as well as their kinetic parameters. The obtained results showed that the Tl dosemeters of LiF: Mg,Cu,P + Ptfe, they presented a bigger sensitivity that the TLD-100 when being irradiated with gamma radiation of {sup 60} Co, in air. While when being irradiated with the same type of radiation, but in phantom of water, their sensitivity was lightly smaller. To the being irradiated with beta radiation of {sup 90} Sr, the relative sensitivity diminished and it was considerably smaller when being irradiated with alpha radiation of {sup 244} Cm. (Author)

  10. Benzene Synthesis for ''14C Measurements and Evaluation of Uncertainty in Mollusk Shells; Sintesis de Benceno para la Determinacion de C''14 y Evaluacion de su Incertidumbre en Conchas de Moluscos

    Energy Technology Data Exchange (ETDEWEB)

    Romero del Hombrebueno, B.; Simon, M. A.; Larena, P.

    2002-07-01

    This work describes the method and instrumentation used by Environmental Isotopes laboratory of the CIEMAT Analytical Chemistry Laboratory (DIAE) for the synthesis of benzene from carbonates of mollusk shells and the liquid scintillation counting of ''14C for radiocarbon dating in these samples. The usefulness of mollusk shells for ''14 C dating are considered. (Author)

  11. {sup 222} Rn determination and physicochemical characteristic and biological in aquifers in the Toluca Valley; Determinacion de {sup 222} Rn y caracteristicas fisicoquimicas y biologicas en acuiferos del Valle de Toluca

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez A, A

    1998-10-01

    Concentration levels of {sup 222} Rn and {sup 226} Rn have been analyzed in water samples from boreholes belonging to the drinking water supply system around Toluca, Mexico. The {sup 222} Rn source is the decay of {sup 226} Rn within the solid matrix of the aquifer. The study was performed during the dry and rainy seasons. {sup 222} Rn concentration was determined by the liquid scintillation technique, {sup 226} Rn was determined by gamma spectrometry, the physicochemical parameters and bacteriological analysis were performed by conventional chemical techniques. Solubilized trace elements were determined by Inductively Coupled Plasma - Mass Spectrometry (Icp-Ms). The radon level fluctuations at the boreholes in Toluca city and Almoloya spring indicated differences in the radon content. At borehole Lodos Prietos 2, the temperature and radon level were systematically the highest in comparison with the other boreholes and the spring indicating a contribution of a regional flow to the water of this particular borehole. The result for {sup 226} Rn, the average {sup 222} Rn observed during the sampling period, no correspondence occurs between the radium and the radon content indicating that, radon is not supported by radium, but is incorporated into the water through fissures in the rocks in contact with the water. The radon levels obtained in house faucets which water is supplied by boreholes decrease as a function of the distance from the source borehole to the house. With the chemical composition of each one of the studied boreholes and spring a Piper diagram was draw indicating the kind of water. The boreholes and spring can be classified as bicarbonate calcium/magnesium. Almost no fluctuation on time was observed in the chemical species and trace elements only a slight increase was observed at the end of the rain season. At Almoloya, spring pollution with coliform bacteria and nitrates showed an anthropogenic contribution to the water deterioration probable and fertilizers and detritus. Most of the studied water samples were potable, however at Lodos Prietos 2 borehole the fluorine concentration was higher than the established norm. (Author)

  12. Separation of oily materials in radioactive waste waters by flotation. Determination of operation and control parameters; Separacion de materiales oleosos en aguas residuales radiactivas por flotacion. Determinacion de parametros de operacion y control

    Energy Technology Data Exchange (ETDEWEB)

    Ortiz O, H.B.; Flores E, R.M. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)]. e-mail: huemantzin@prodigy.net.mx

    2003-07-01

    In this work the determination of the operation and control parameters (air/solids ratio G/S, retention time {theta}, pressure P and de pressurized volume of mixed air-water V), of the flotation system used in the treatment of oleaginous residual water (polluted mainly with {sup 60} Co) coming from the decontamination process of worn out oils, using as response parameters the concentration of oleaginous material and the residual turbidity. The obtained results allowed to observe the dependence of G/S with the pressure and volume of air-water given. At the same time it was settled down that the set of operation conditions that offers the greater separation percentage of G As and turbidity in the smallest time, they are those obtained by V{sub 2} = 0.0012 m{sup 3} and P{sub 2} = 620 kPa, (G/S = 0.30 - 0.35, = 14-16 min) for what were employees as the ideal values of operation and control in the flotation system. As long as, the concentration of total Co is found under 1 mgL{sup -1}. Finally, the selected flotation system showed high separation levels of {sup 60} Co, whose specific activity are below of 0.007 BqmL{sup -1}. (Author)

  13. Plasma density determination by microwave interferometry .- The 2 mm interferometer of the TJ-1 Tokamak; Determinacion de la densidad de un plasma por interferometria de microondas. El interferometro de 2 mm del Tokamak TJ-1

    Energy Technology Data Exchange (ETDEWEB)

    Martin, R.; Manero, F.

    1984-07-01

    In this paper a description is given of the microwave interferometer used for measuring the plasma electronic density in the TJ-1 Tokamak of Fusion Division of JEN. The principles of the electronic density measurement are discussed in detail, as well as those concerning the determination of density pro files from experimental data. A description of the interferometer used in the TJ-1 Tokamak is given, together with a detailed analysis of the circuits which constitute the measuring chain. The working principles of the klystron reflex and hybrid rings are also presented. (Author) 23 refs.

  14. Determination of tolerances in the positioning of the treatment table from an image-guided system; Determinacion de tolerancias en el posicionamiento de la mesa de tratamiento a partir de un sistema de imagen guiada

    Energy Technology Data Exchange (ETDEWEB)

    Perez Moreno, J. M.; Zucca Aparicio, D.; Fernandez leton, P.; Garcia Ruiz-Zorrilla, J.; Minanbres Moro, A.

    2011-07-01

    The use of techniques of image-guided radiotherapy (TGRT) aims to reduce the uncertainties associated with patient positioning. One of the techniques more recent development is the cone beam CT (CBCT), consisting of the acquisition of volumetric images of the patient by a detector integrated into the linear accelerator. By analyzing the results of all sessions of treatment to all patients in which the positioning has been carried out with image-guided system MV CBCT have been determined tolerance tables for translational coordinates of the table treatment based on pathology and immobilization system used. (Author)

  15. Study of tellurium determination through volatile hydride and direct introduction to a plasma spectrometer of low power. Estudio de la determinacion de Teluro mediante la generacion e introduccion de su hidruro en plasmas de acoplamiento inductivo (ICP) de baja potencia

    Energy Technology Data Exchange (ETDEWEB)

    Lopez Molinero, A.; Barriovero, O.; Lechon, J.M.; Castillo, J.R. (Universidad de Zaragoza. Facultad de Ciencias. Departamento de Quimica Analitica. Zaragoza (Spain))

    1993-01-01

    Tellurium has been determined by AES-ICP at 214,282 nm with a detection limit of 4 ng/ml and a relative standard deviation (r.s.d.) of 3.0/. These performances have been attained via generation of the volatile hydride and direct introduction to a plasma spectrometer of low power. This analytical method has been applied to Te determination in plastic additives. (Author) 17 refs.

  16. Determination of internal pressure and the backfill gas composition of nuclear fuel rods; Determinacion de la presion interna y la composicion del gas de llenado de barras de combustible nuclear

    Energy Technology Data Exchange (ETDEWEB)

    Garcia C, M.A.; Cota S, G.; Merlo S, L.; Fernandez T, F. [Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    1997-07-01

    An important consideration in the nuclear fuel manufacturing is the measurement of the helium atmosphere pressure and its composition analysis inside the nuclear fuel rod. In this work it is presented a system used to measure the internal pressure and to determine the backfill gas composition of fuel rods. The system is composed of an expansion chamber provided of a seals system to assure that when rod is drilled, the gas stays contained inside the expansion chamber. The system is connected to a pressure measurement digital system: Baratron MKS 310-AHS-1000. Range 1000 mm Hg from which the pressure readings are taken when this is stabilized in all the system. After a gas sample is sent toward a Perkin Elmer gas chromatograph, model 8410 with thermal conductivity detector to get the corresponding chromatogram and doing the necessary calculations for obtaining the backfill gas composition of the rod in matter. (Author)

  17. Problems of interference and geometry of the detectors in a beam tube for the determination of the neutron spectra; Problemas de interferencia y geometria de los detectores en un tubo de haces para la determinacion del espectro de neutrones

    Energy Technology Data Exchange (ETDEWEB)

    Paredes G, L.C

    1991-11-15

    The detector materials were selected and proved for the thermal, intermediate and quick energy intervals of the neutron spectra, in the radial tube RW-2 to 1 MW of thermal power during 5 min, being obtained good results respect to the activation of the thin sheets. However, since the exhibition speed, of each experimental arrangement after it irradiation that was of the order of 2 R/h, it was considered that may be more convenient the irradiation, separated from each thin sheet, for that which it was selected the SINCA irradiation system, because it simplified the activities related with the individual irradiation of the thin sheets and the count of the same ones. It was found that the selection, the geometric arrangement and measurement of the activities of the used thin sheets, its are the three factors that more affect the input data of the SAND II code that it will be used in our case for the determination of the neutron spectra of the Reactor. (Author)

  18. An effective and economic system for the determination of biogas production in discontinuous assays; Sistema effectivo y economico parala determinacion de la produccion de biogas en ensayos en discontinuo

    Energy Technology Data Exchange (ETDEWEB)

    Ferrer, I.; Fornes, O.; Ferrer, O.; Gordillo, M. A.; Font, X.

    2004-07-01

    Methodology for the determination of anaerobic biodegradability or toxicity assays is well described in bibliography. However a certain lack of information exists regarding the experimental assembly for the realization of such assays. In this article the experimental setup is described in detail, as well as the cost of a system for the determination of biogas production in toxicity or biodegradability anaerobic assays. (Author) 10 refs.

  19. Determination of the best operation point of a solar pumping systems user to water a crop; Determinacion del punto optimo de funcionamiento dinamico en equipos de bombeo solar utilizados para riegos

    Energy Technology Data Exchange (ETDEWEB)

    Cuadros, E.; Silos, I.; Marcos, A.; Lopez-Rodriguez, F.

    2004-07-01

    In this article it is estimated the best operation point of a solar pumping system used to water a crop. This point depends on 1) the climate characteristic of the zone, 2) the watering demands of the crop and, 3) the characteristic of the solar pumping system, like flow-area-height-frequency of the inversor-variator. In this work are analyzed and commented the results obtained from the group of pressure/height curves of a 1 HP pump powered by a 1.100 W photovoltaic system according to the frequency of the inversor /variator, during the summer time. (Author)

  20. Correction for the interference of strontium in the determination of uranium in geologic samples by X-ray fluorescence; Correccion de la interferencia del estroncio en la determinacion del uranio en materiales geologicos mediante fluorescencia de rayos X

    Energy Technology Data Exchange (ETDEWEB)

    Roca, M.; Bayon, A.

    1981-07-01

    A suitable empirical algorithm for the correction for the spectral interference of the SrK{alpha} on the UL{alpha} line has been derived. It works successfully for SrO concentrations up to 8% with a minimum detectable limit of 20 ppm U{sub 3}O{sub 8}. X-ray spectrometry procedure allows also the determination of the SrO contents of the samples. A program in BASIC language for data reduction has been written. (Author) 3 refs.

  1. Determination of the neutrons energy spectrum in the central thimble of the reactor core TRIGA Mark III; Determinacion del espectro de energia de los neutrones en el dedal central del nucleo del reactor TRIGA Mark III

    Energy Technology Data Exchange (ETDEWEB)

    Parra M, M. A.; Luis L, M. A. [Universidad Autonoma Metropolitana, Unidad Azcapotzalco, Division de Ciencias Basicas, Av. San Pablo No. 180, Col. Reynosa Tamaulipas, 02200 Mexico D. F. (Mexico); Raya A, R.; Cruz G, H. S., E-mail: roberto.raya@inin.gob.mx [ININ, Departamento del Reactor, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico)

    2013-10-15

    This work presents the measurement of the neutrons spectrum in energies in the central thimble of the reactor TRIGA Mark III to a power of 1 MW in stationary state, with the core in the center of the pool. To achieve this objective, several thin sheets were irradiated (one at the time) in the same position of the core. The activation probes were selected in such a way that covered the energy range (1 x 10{sup -10} to 20 MeV) of the neutrons spectrum in the reactor core, for this purpose thin sheets were used of {sup 197}Au, {sup 58}Ni, {sup 115}In, {sup 24}Mg, {sup 27}Al, {sup 58}Fe, {sup 59}Co and {sup 63}Cu. After the irradiation, the high energy gamma emissions of the activated thin sheets were measured by means of gamma spectrometry, in a counting system of high resolution, with a Hyper pure Germanium detector, obtaining this way the activity induced in the thin sheets whose magnitude is proportional to the intensity of the neutrons flow, this activity together to a theoretical initial spectrum are the main entrance data of the computational code SANDBP (Hungarian version of the code Sand-II) that uses the unfolding method for the calculation of the spectrum. (Author)

  2. Influence of geometry calibration in the determination of gamma emitters in active carbon filters; Influencia de la geometria de calibracion en la determinacion de emisores gamma en filtros de carbon activo

    Energy Technology Data Exchange (ETDEWEB)

    Laurado Tarrago, M.; Tent Petrus, J.

    2013-07-01

    Testing laboratories participate in external quality controls. For these controls are useful it is necessary to eliminate factors that can introduce sources of variability in the results. A factor to consider in this paper as a source of variability is the calibration geometry chosen for the correct quantification of the activity concentrations. This work contains the results of the intercomparison exercise and from them analysed the effect of the geometry of calibration used in the quantification of activity concentrations present in the activated carbon filter. (Author)

  3. Using Bromocresol Purple to Determine Fecal Coliforms with the Most Probable Number Technique; Utilizacion de purpura de bromocresol para la determinacion de coliformes fecales con la tecnica del numero mas probable (NMP)

    Energy Technology Data Exchange (ETDEWEB)

    Vazquez Borges, E.; Mendez Novelo, R.

    2003-07-01

    The object of this piece of research was to determine the reliability of using bromocresol purple as an indicator for determining fecal coliforms by means of the most probable number (MPN) technique using multiple tubes and comparing the results obtained in this way with those obtained using the traditional technique of the formation of carbon dioxide in a Durham tube. Twelve samples of different types of water were analysed using sets of nine tubes, one with a Durham tube and another with the addition of bromocresol purple. In the former case, a reaction was jadged as positive (indicating the presence of coliforms) if CO{sub 2} was formed in the Durham tube. In the latter case, the reaction was considered as positive if a change in colour-from purple to yellow-of the culture medium was observed. A statistical analysis was performed to determine the significant differences in the sensitivity and specificity of both methods. (Author)

  4. An X-ray fluorescence method for the determination of small quantities el elements collected on filters; Determinacion de pequenas concentraciones de elementos en filtros por espectrometria de fluorescencia de rayos X

    Energy Technology Data Exchange (ETDEWEB)

    Diaz-Guerra, J. P.; Bayon, A.

    1981-07-01

    An X-ray fluorescence method for the determination of As, Ba, Co, Cr, Cu, Fe, Hg, Mn, Ni, Pb, Se, U, V and Zn collected on P.V.C. filters in concentration ranges from 0,6 to 1000{mu}g, depending on the element, is described. A sequential automatic spectrometer with a chromium tube is used for tho Ba determination, while As, Hg, Pb, Se and U are bottler determined with a molybdenum one. For the rest of the elements a tungsten target is preferred. The interferences between AsK{sup {alpha}}{sub 1},2- PbL{sup {alpha}}{sub 1},2 and CrK{sup {alpha}}{sub 1},2-Vk{beta}{sub 1},3 lines are corrected by applying specific coefficients. The radial variation of the primary X-ray beam intensity on the irradiated surface has been specially studied with chromium, gold, molybdenum and tungsten tubes. For that purpose different x-ray wavelengths in the range 9,89 A to 0,56 A have been selected. The curves obtained show a rather high heterogeneity for the excitation source. This conclusion implies the need for an homogeneous distribution of elements on the filter. (Author) 7 refs.

  5. Determination of rubidium and strontium in geological materials by X-Ray fluorescence spectrometry; Determinacion de rubidio y estroncio en materiales geologicos mediante espectrometria de fluorescencia de rayos X

    Energy Technology Data Exchange (ETDEWEB)

    Roca, M.

    1979-07-01

    In order to determine whole-rock ages by the Rb/Sr procedure, an X-ray fluorescence spectrometry method for the determination of both elements has been developed. The samples are pressed into boric acid backed and ringed pellets with this material as a binding agent. Matrix corrections are made following the determination od the mass absorption coefficients, based on the intensity of the Compton-scattered peak of MoK{alpha}. or MoK{beta}{sub 1}.3. The U. S. Geological Survey granodiorite GSP-1 is used as a reference standard. Spectral-line interferences have been carefully studied and the empirical correction factors determined. A BASIC language program for calculating the Rb and Sr concentrations and the Rb/Sr ratios has been written. (Author) 7 refs.

  6. Spectrographic Determination of Impurities in Ceramic Materials for Nuclear fusion Reactors. II. Analysis of Magnesium Aluminate; Determinacion Espectrografia de Impurezas en materiales Ceramicos para Fusion Nuclear. II. Analisis de Aluminato de Magnesio

    Energy Technology Data Exchange (ETDEWEB)

    Rucandio, M. I.; Roca, M.; Melon, A.

    1990-07-01

    The determination of minor and trace elements in the magnesium aluminate, considered as possible material in thermonuclear fusion reactors, has been studied. The concentration ranges are 0.1 - 0.3 % for Ca, SI and Y, and at the ppm level for Co, Cr, Fe, Hf, K, Li, Mn, Na, Ni, Se, Ta, Ti, V and Zr. Atomic emission spectroscopy with direct current are excitation and photographic detection has been employed. For Hf, Ta and Zr the use of 40% of copper fluoride as a carrier and of Nb as internal standard provide suitable sensitivities and precessions, while for the rest of elements the best results are obtained with graphite powder in different proportions and Rb or Sn as internal standard. (Author)4 refs.

  7. Determination of the solid consumption in the transport of sands in sea beds with gold 198; Determinacion del gasto solido en el transporte de arenas en lechos marinos con oro 198

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez A, G

    1983-07-01

    The study of the movement of sediments in sea beds, is necessary when one plans to build a port. Among the techniques used for this studies, it is the radiotracer balance that gives an useful estimation of the quantity of sediment that it moves per day and by meter (perpendicular to the displacement). The main objectives of this work are: to) to present the characteristics of the obtaining of the used radiotracer, describing details those used safety measures, b) to describe the handling of the radiotracer and it radiological safety, during the transport and injection in the sea bottom, c) description of the detection way and the used equipment, d) to describe the information processing obtained in the field and finally, e) the estimate of the solid consumption and the determination of the direction and speed of displacement of those sediments in the sea bottom, in front of the Tabasco coast, to be used jointly with the information obtained by means of other techniques so that one can make a good planning of the operations of dredging during the construction and later on the maintenance of the Dos Bocas marine terminal. The first step is to obtain the radiotracer that in this case was sand of uniform grain metric, marked superficially with Gold-198. The second step is to transport the sand to the place of interest, to place it in the injection equipment and to deposit it in the sea bottom. The third step is to detect the radiotracer in the sea bed, from a craft that drags a sled, which takes mounted a scintillation detector of sodium iodide activated with thallium NaI(Tl) (probe). The fourth step is to process the field information and to obtain the corresponding results. (Author)

  8. Application of the exact distribution pj{sub k} in the determination of kinetic parameters in a reactor; Aplicacion de la distribucion exacta p{sub k} a la determinacion de parametros cineticos de un reactor

    Energy Technology Data Exchange (ETDEWEB)

    Alca Ruiz, F.

    1982-07-01

    In this report one distribution of neutron counts obtained by a detector placed in a reactor is studied in order to be used in the determination of reactor kinetic parameters such as {beta}/{lambda} and reactivities. The parameters accuracy from this new method is compared with the Feynman and Mogilner method, based too in Reactor Neutron Noise Analysis. These three methods have been applied to JEN-2 reactor and the better accuracy and faster collection of experimental data give some interest to the new method which only requires a good footing code. (Author) 68 refs.

  9. Determination of the kinetic parameters of K{sub 2}Y F{sub 5}: Tb; Determinacion de los parametros cineticos de K{sub 2}Y F{sub 5}: Tb

    Energy Technology Data Exchange (ETDEWEB)

    Gallegos, A.A. [CICATA-IPN, Legaria 694, Col. Irrigacion, 11500 Mexico D.F. (Mexico); Khaidukov, N.M. [Kurnakov Institute of General and Inorganic Chemistry, Moscow (Russian Federation); Azorin, J. [UAM-I, 09340 Mexico D.F. (Mexico)

    2005-07-01

    In this work the K{sub 2}Y doped materials with percentages of 0.01 and 0.2 of F{sub 5} and, 0.8 and 0.99 of Tb{sup 3+} were studied to determine the kinetic parameters (activation energy and frequency factor) of TL peaks with the purpose of comparing those sensitive qualities of the materials at the doping with TR and their candidacy for tests of TL dosimetry (linearity of the response with the absorbed dose and the reproducibility of the measures of the dose). The samples were irradiated with a beta source of {sup 90} Sr/{sup 90} Y, to ambient temperature, giving its a dose of 236.6 mGy, later the kinetic parameters with different experimental procedures were determined: isothermal decay to ambient temperature and erased of peaks not desired to greater temperature than the ambient. The glow curves (TL curves) were obtained with an TL analyzer Harshaw 4000, with interface to CPU for the handling of the data of the curves, which were treated with the curve form method and the models of: Chen first approach and Chen modified, corrected Lushchik approach and Grossweiner approach, to calculate the kinetic parameters of the sample. (Author)

  10. Joint economic dispatch of energy and reserve. Reserve requirements determination from seconds considering the system dynamical behavior; Despacho economico conjunto de energia y reserva. Determinacion optima del requerimiento de reserva de segundos considerando el comportamiento dinamico del sistema

    Energy Technology Data Exchange (ETDEWEB)

    Castillo, R.A.; Vargas, A. [Universidad Nacional de San Juan (Argentina). Inst. de Energia Electrica]. E-mail: Rolcas@iee.unsj.edu.ar; Avargas@iee.unsj.edu.ar

    2001-07-01

    This paper presents a new methodology for calculation the joint economic dispatch of energy and Rotating Reserve of Seconds(RRS), taken into account the dynamical response from the system when facing different disturbances. This method not only assigns the electric power and RRS in the generation units in an optimal way, as well as determines the required optimum level for the system. The problem is not linear and can be solved using an iterative lineal procedure. Finally, it is made a comment involving the responsibilities which correspond to each generation unit with respect to the RRS system requirements.

  11. Analysis of polycyclic aromatic hydrocarbons I. Determination by gas chromatography with glass and fused silica capillary columns; Analisis de Hidrocarburos aromaticos policiclicos. I. Determinacion por cromatografia de gases con columnas capilares de vidrio de silice fundida

    Energy Technology Data Exchange (ETDEWEB)

    Perez, M. M.; Gonzalez, D.

    1987-07-01

    A study of the analysis by gas chromatography of aromatic polycyclic hydrocarbons is presented. The separation has been carried out by glass and fused silica capillary column. The limitations and the advantages of the procedure are discussed in terms of separation efficiency, sensitivity and precision. (Author) 17 refs.

  12. Determination of the dose in eyes lens by TLD, in PET/CT by technicians in PET/CT service; Determinacion de la dosis en cristalino por medio de TLD, en personal tecnico de servicio PET/CT

    Energy Technology Data Exchange (ETDEWEB)

    Marino, Emiliano A., E-mail: eam.marino@gmail.com [Universidad Nacional de Cuyo (UNC), Rio Negro (Argentina). Instituto Balseiro; Arenas, German M. [Fundacion Escuela de Medicina Nuclear (FUESMEN), Mendoza (Argentina)

    2013-11-01

    This work was supported, on the one hand, in a part of the project ORAMED which consisted of a design of a TLD dosimeter for measurements of Hp (3) in areas close to the lens, for interventional radiology physicians. On the other hand, Berhens work proposes using calibrated TLDs Hp (0.07) and Hp (10) to estimate Hp (3) crystal. This resulted in dosimeters calibrated using Hp (10) slab, and mount them on glasses, to estimate the dose to the lens of the technical staff of the Service PET / CT. The value obtained 29mSv/year of Lens Dose Equivalent exceeds the recommended limit. We also demonstrate that, under the current working conditions, the values of Hp (3) reported from whole body dosimeter does not represent faithfully the lens dose.

  13. Kinetic study of the biological treatment in waste water treatment plant; Iniciacion a la determinacion por respirometria de medidas de control y relaciones cineticas basicas del reactor biologico de una estacion depuradora de aguas residuales

    Energy Technology Data Exchange (ETDEWEB)

    Serrano, J. E.

    2003-07-01

    The kinetic study of the biological treatment may help determine the speed in which the microorganisms metabolise a specific substrate and then we can obtain the necessary information to figure out the calculations for the dimensions of a biological reactor. Since the wastewater treatment should not be an exact science, a new generation of respirometry systems, based on simple methods, allow us to go through these parameters from a practical and efficient stance. To this end, in this work, we have selected the most simple calculation methods in order to create an easy and friendly background. Respirometry is the window through which we can observe active sludge life. Other systems, not based on the genuine biological activity of the sludge, no not reflect the actual state and reactions taking place in the biological reactor. For all the aforesaid reasons, the new generation of Respirometry may be considered as a fundamental tool for control, surveillance and kinetic parameter performance. (Author)

  14. Determination of the dose rate to the center of the irradiation chamber of the Gamma cell 220 AECL; Determinacion de la razon de dosis al centro de la camara de irradiacion del Gammacell 220 AECL

    Energy Technology Data Exchange (ETDEWEB)

    Zuazua G, M.P

    1991-11-15

    To determine the dose rate at the center of the irradiation chamber of the Gamma cell 220 AECL, two different spectrophotometers for to measure the absorbency of the irradiated dosemeters were used. In the first one dosimetry, the absorbency of the irradiated Fricke solution was read in the Varian-UV-visible spectrophotometer Series 634 of the Applied Research Management. For the second dosimetry it was used the Shimadzu UV-visible spectrophotometer belonging to the Special Projects Department. The obtained results in this study are presented. (Author)

  15. Determination of the radon concentration in soil and ground water and its association with the seismicity; Determinacion de la concentracion del radon en suelo y agua subterranea y su asociacion con la sismicidad

    Energy Technology Data Exchange (ETDEWEB)

    Pena, P.; Segovia, N. [ININ, A.P. 18-1027, 11801 Mexico D.F. (Mexico); Azorin, J. [UAM-I, 09340 Mexico D.F. (Mexico)

    2003-07-01

    The coast of the Mexican Pacific is one of the seismic areas more active of the world due to the subduction of the badges of Coconuts and Rivera under the badge of North America. The earthquakes that happen in this part of Mexico they are of great magnitude and they affect to the central plateau of the country where finds the biggest population density. On the other hand the coast of the Gulf of Mexico presents one relatively low seismic activity. It is in this region where it is the nuclear plant of Laguna Verde (PNLV) and the studies of seismicity of the area should be carried out for questions of nuclear security. One carries out a study of fluctuations of the concentration of the radon in floor and it dilutes underground in the mentioned areas using accustomed to detectors of nuclear appearances (LR-115). Possibly they were also used detecting automatic (Clipperton sounds out). In some cases it was analysed the gamma radiation in soil using thermoluminescent dosemeters (CaSO{sub 4}: Dy + Ptfe). The mineralogical composition of rock samples was obtained, by means of technical conventional and Electron scanning microscopy and an X-ray diffractometer. The study one carries out along the coast of Guerrero, from Guacamayas, Mich. until Marquelia, Gro., of 1993 at 1998 and in the coast of the Gulf of Mexico, in the PNLV and their surroundings, of 1994 at 1996. The fluctuations of the radon concentration and of the gamma radiation, were analysed in function of the local seismic activity, the meteorological parameters and those characteristic geologic. In the area of the PNLV, the results showed that in general the averages of those value of the radon concentration, as much in floor as in water, they were low. A station located in a flaw area (New Ranch) the one that I present the values was but high of radon concentration, corresponding those but first floor to the PNLV. The seismic activity during the one period of sampling was sporadic and of low intensity and alone one could observe that the flaw area the one that had values bigger than the radon concentration was. Some variations of the concentration of the radon could be correlated with the meteorological parameters and those characteristic geologic. The anomalies of the values of the concentration of the radon were presented in general during the rainy season. In the coast of the Pacific one observes an intense seismic activity (M>4) in the period of sampling. The concentration of the radon in floor measured in long periods of time didn't respond with picks one to one to the local earthquakes, but it showed a global increase in an area of high seismic activity. The variations of the radon concentration and of the radiation gamma they showed a strong correlation among if. The differences in the composition of the rocks were reflected in you differ so much in the radon emanation like in the levels of radiation gamma in the area studied. The fluctuations of the concentration of the radon in floor showed occasionally dependence with the meteorological parameters, the same as in the area of the Gulf, the maximum values were obtained mainly in the rainy season. (Author)

  16. Determination of patterns of interplanar distances starting from crystalline parameters for the Cyber computer of the ININ; Determinacion de patrones de distancias interplanares a partir de parametros cristalinos para la computadora Cyber del ININ

    Energy Technology Data Exchange (ETDEWEB)

    Macias B, L.R

    1991-03-15

    In this report a program in Fortran language that reproduces the pattern of the Joint Committee on Powder Diffraction Standards is presented and that it can be applied to identify non well-known samples such as in those that only by means of articles or other sources the values of the parameters of the elementary cell are lightly known and by this way the correspondent diffraction pattern can be accurately generated. (Author)

  17. Spectrographic Determination of Impurities in Ceramic Materials for Nuclear Fusion Reactors. I. Analysis of Alumina; Determinacion Espectrografica de impurezas en materiales ceramicos para fusion nuclear. I.- Analisis de alumina

    Energy Technology Data Exchange (ETDEWEB)

    Rucandio, M. I.; Roca, M.; Melon, A.

    1990-07-01

    The determination of minor and trace elements in the aluminium oxide considered as possible ceramic material in thermonuclear fusion reactors has been studied. The concentration ranges are 0.1 - 0.3 * for Ca, Si and Y, and at the ppm level for Co, Cr, Fe, Hf, K, Li, Mg, Mn, Na, Ni, Se, Ta, Ti, V and Zr. Atomic emission spectroscopy with direct current ore excitation and photographic detection has been employed. For Hf, Mg, Ta, Ti, V and Zr the use of 40% of copper fluoride as a carrier and of Nb as lnternal standard provide suitable sensitivities and precessions, while for the rest of elements the bent results are obtained with graphite powder in different proportions and Rb or Sn as internal standard. (Author) 7 refs.

  18. ESTUDIO DE ESTABILIDAD DE 2,6-TADAP Y DE SU PRODUCTO DE DESCOMPOSICION 2,6-DAPEMA, UTILIZADOS COMO LIGANTES CROMOFOROS EN EL DESARROLLO DE METODOS ANALITICOS PARA LA DETERMINACION DE METALES DEL GRUPO DEL PLATINO

    OpenAIRE

    SOTO SALAZAR, CESAR ANTONIO

    2003-01-01

    Uno de los hechos de mayor impacto a nivel ambiental de los últimos treinta años, ha sido la introducción de convertidores catalíticos en los automóviles, para mejorar la combustión de los combustibles, logrando disminuir en cierto grado la contaminación atmosférica. La combustión incompleta de hidrocarburos produce compuestos inestables, dañinos para al organismo humano y para la vida en general. En virtud de lo anterior, es necesario el desarrollo de métodos de análisis simples y efic...

  19. Dynamic simulation of a pumping system using the wind power and determination of the aeolian resources; Simulacion dinamica de un sistema de bombeo utilizando la potencia del viento y determinacion de recursos eolicos

    Energy Technology Data Exchange (ETDEWEB)

    Velasco Lozano, Miguel

    2002-05-15

    The present investigation project pretends toward analyze the possibility of pumping water using Aeolian energy from the Soto la Marina River to the Contadero Lagoon, through an eight kilometers channel. In order to obtain this objective it is necessary to analyze diverse configurations for Aeolian energy converters as well as to determine the Aeolian potential of the site. An isolated Aeolian energy pumping system will be analyzed, that is to say, without interconnection with the electric power network and another interconnected with this network. In addition, with the installation of meteorological monitoring stations a partial evaluation of the Aeolian resource in the zone will be made. This research project was born as a result of an invitation of the Dr. Eric Gustafson, President of Conservation Mexico A.C. and of Ing. Virgilio Garza, President of the Vigia Group, to participate in a project called Laguna Flamingo. Such project deals with the restoration of a habitat of aquatic birds in the Contadero Lagoon, property of Ing. Virgilio Garza in Soto la Marina, Tamaulipas, Mexico. [Spanish] El presente proyecto de investigacion pretende analizar la posibilidad de bombear agua utilizando energia eolica desde el rio Soto La Marina hasta la laguna Contadero, a traves de un canal de 8 km. Para lograr este objetivo es necesario analizar diversas configuraciones de convertidores de energia eolica asi como determinar el potencial eolico del sitio. Se analizara un sistema de bombeo con energia eolica operando aislado, es decir, sin interconexion con la red electrica y otro interconectado con dicha red. Ademas, con la instalacion de estaciones de monitoreo meteorologico se realizara una evaluacion parcial del recurso eolico en la zona. Este proyecto de investigacion nacio a raiz de una invitacion del Dr. Eric Gustafson, Presidente de Conservacion Mexico A.C. y del Ing. Virgilio Garza, Presidente del grupo Vigia, para participar en un proyecto llamado Laguna Flamingo. Tal proyecto trata de la restauracion de un habitat de aves acuaticas en la laguna Contadero, propiedad del Ing. Virgilio Garza en Soto La Marina, Tamaulipas, Mexico.

  20. Determination of the facade potentially collecting areas in urban places by means of a computational graphic model; Determinacion del area de fachadas potencialmente colectoras, en medios urbanos, a traves de un modelo grafico computacional

    Energy Technology Data Exchange (ETDEWEB)

    Mesa, Nestor A; Cortegoso, Jose L; De rosa, Carlos [Centro Regional de Investigaciones Cientificas y Tecnnologicas (CRICYT) Mendoza (Argentina)

    2000-07-01

    In Argentina almost 30% of the total end-use energy is consumed by the building sector. Within it, for residential use, the most usual fuel is natural gas. According to a 1997 survey, the known reserves would last approximately 32 years at the present rate of consumption. It is therefore essential to asses the performance of the building stock, in relation to energy conservation and the access to renewable energy resources, in order to plan the future urban development within the scope of maximum achievable energetic and environmental sustainability compatible whit the present urban morphology. The particular features of environments within the urban system, may significantly condition the access to and the availability of climatic resources. When the technical feasibility of a specific climatic design, for a new or refurbished building is analyzed, it is necessary to asses the available solar potential and potentially collecting areas, particularly within high density urban environment, where the shadows cast by tall neighboring buildings can significantly reduce solar access. A graphic-computational model developed for the purpose is described; it is a precise and easy to use tool. Departing from the loading of the buildings volumes coordinates, of a given urban environment and the solar position it will draw axonometric perspectives as seen from the sun. It will then calculate the areas, normal to the sun beams of the radiation prisms impinging on every building facade, for any hour or day of the year. The model was developed within the environment of the AutoCADR program. [Spanish] Del total de los recursos energeticos consumidos en la Argentina casi el 30% corresponde al uso domestico, de ese total a escala residencial el mas utilizado para la calefaccion es el gas natural, contando en la actualidad, segun estudios realizados en el ano 1997, con un volumen de reserva para unos 32 anos, manteniendose la tasa de consumo actual. Esto hace imprescindible conocer el comportamiento del parque edificio, en lo referente a la conservacion de energia y el acceso a los recursos energeticos renovables, para planificar el crecimiento urbano dentro de un marco de maxima sustentabilidad energetico ambiental compatible con la actual morfologia urbana. Las particulares caracteristicas de la estructura urbana, condicionan de manera significativa el acceso y la disponibilidad de recursos climaticos. Cuando se analiza la viabilidad de un diseno bioclimatico en un edificio nuevo o en el reciclado de uno existente es necesario conocer el potencial solar disponible, ademas de las areas colectoras potenciales, sobre todo en ambitos urbanos de alta densidad, donde la incidencia de los volumenes edilicios vecinos, sobre el acceso al sol es notable. Se describe un metodo grafico computacional de alta precision y de facil manejo que, a partir de la carga de una volumetria edilicia y de los valores de posicion solar, permite obtener perspectivas axonometricas vistas desde el sol, dando como resultado, superficies de secciones normales a la direccion de los rayos solares incidentes sobre cada fachada asoleada, para cualquier hora y dia del ano. La rutina del metodo se desarrolla dentro del ambiente de programacion de AutoCAD{sup R}, por considerar que dicho entorno, es uno de los mas utilizados en el medio del diseno asistido por computadora, lo que permite obtener un resultado facilmente transferible.

  1. Determination of the water quality and radon content in wells located at the Cuitzeo basin, Michoacan; Determinacion de la calidad del agua y contenido de radon en pozos localizados en la Cuenca de Cuitzeo, Michoacan

    Energy Technology Data Exchange (ETDEWEB)

    Alfaro, R.; Segovia, N.; Pena, P.; Lopez, M.B.E. [Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico); Martinez, V. [CIRA-UAEM, Cerro de Coatepec s/n, Ciudad Universitaria, Toluca, Estado de Mexico (Mexico); Armienta, M.A. [IGFUNAM, 04510 Mexico D.F. (Mexico); Rangel, J. [CNA Av. Acueducto 3626 Col. Ocolusen, Morelia, Michoacan (Mexico); Seidel, J.L. [ISTEEM, M.S.E. Montpellier (France)

    2001-07-01

    Major elements, trace elements, presence of microorganisms and, radon content in wells located in urban and rural zones around the Cuitzeo lake at the Lerma River basin in Mexico were determined. The techniques to determine the parameters were the liquid scintillation method for {sup 222} Rn, Icp-Ms for trace elements, conventional chemical analysis for major components and the counting in slide for the bacteriological determination. The average concentration of radon oscillated between 0.88 and 4.75 Bq/lt which, indicated a fast transit from the reload toward the spring exit. The major components and trace elements are analysed considering the geological characteristics of the sites in study. Faecal coliforms were not found. (Author)

  2. Development of a simplified methodology for the isotopic determination of fuel spent in Light Water Reactors; Desarrollo de una metodologia simplificada para la determinacion isotopica del combustible gastado en reactores de agua ligera

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez N, H.; Francois L, J.L. [FI-UNAM, 04510 Mexico D.F. (Mexico)]. e-mail: hermilo@lairn.fi-b.unam.mx

    2005-07-01

    The present work presents a simplified methodology to quantify the isotopic content of the spent fuel of light water reactors; their application is it specific to the Laguna Verde Nucleo electric Central by means of a balance cycle of 18 months. The methodology is divided in two parts: the first one consists on the development of a model of a simplified cell, for the isotopic quantification of the irradiated fuel. With this model the burnt one is simulated 48,000 MWD/TU of the fuel in the core of the reactor, taking like base one fuel assemble type 10x10 and using a two-dimensional simulator for a fuel cell of a light water reactor (CPM-3). The second part of the methodology is based on the creation from an isotopic decay model through an algorithm in C++ (decay) to evaluate the amount, by decay of the radionuclides, after having been irradiated the fuel until the time in which the reprocessing is made. Finally the method used for the quantification of the kilograms of uranium and obtained plutonium of a normalized quantity (1000 kg) of fuel irradiated in a reactor is presented. These results will allow later on to make analysis of the final disposition of the irradiated fuel. (Author)

  3. Determination of mercury in urine through Neutron activation analysis in dentists, as a measure of occupational exposure; Determinacion de mercurio en orina mediante analisis por activacion neutronica en odontologos, como una medida de exposicion ocupacional

    Energy Technology Data Exchange (ETDEWEB)

    Padilla M, M.A

    2000-07-01

    The mercury level was studied in urine to a dentists group belonging at the Universidad Autonoma del Estado de Mexico to determine the grade of contamination to the exposure of this element during their occupational activity. It was used the Neutron activation analysis which is an analytical method based in the irradiation with neutrons toward a stable nuclide. This can suffer a nuclear transformation to produce a radioactive nuclide and so it will be able to realize a quantitative analysis of itself. The TRIGA Mark III Reactor at the Nuclear Center in Mexico was used to realize this type of analysis due to the neutron fluxes which can be obtained as well as to the facilities in the irradiation of the sample.The purpose of this work is to determine the concentrations of mercury in the occupational exposed personnel such as dentists and so giving the recommendations of safety required to their production. (Author)

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

    Energy Technology Data Exchange (ETDEWEB)

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

    1998-12-31

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

  5. Monitoring organo chlorine pesticides in surface and ground water in San Juan (Argentina); Determinacion de pesticiddas organoclorados en aguas superficiales y subterraneas de la provincia de San Juan (Argentina)

    Energy Technology Data Exchange (ETDEWEB)

    Omar, B.; Suero, E.; Augusto, M.; Gimenez, M.; Flores, N.

    2003-07-01

    The level of contamination with organo chlorine pesticides and the occurrence of their degradation products in the basins of the two main rivers. San Juan and Jackal, of the Province of San Juan, Argentina, were determined. Surface and groundwater samples from both river basins were evaluated by capillary GC and results confirmed with Mass Spectrometry. Chemicals investigated were 16 organo chlorine pesticides. For a total number of 314 samples, the percentage of positive samples ranged from 68.6% for Heptachlor to 16% for Aldrin. concentration values and the percentage of positive samples in groundwater were significantly lower than those found in surface water. Samples taken in different seasons did not show significant differences. (Author) 18 refs.

  6. The use of halogen carriers and buffers in the spectrographic determination of boron in carbonaceous materials and their combustion products; Empleo de agentes halogenantes y reguladores en la determinacion espectrografica de Boro en carbones y productos derivados

    Energy Technology Data Exchange (ETDEWEB)

    Rucandio, M. I.; Martin, M.; Roca, M.

    1992-07-01

    For the determination of boron in carbonaceous materials (high purity graphite, coals and their processed products, such as ashes and slags from thermoelectric power plants) by atomic emission spectroscopy with direct current are excitation and photographic recording, the behaviour of the analyte in the presence of halide compounds or spectrochemical buffers has been studied. Among the halides, cupric fluoride at a low concentration (2%) becomes very suitable for the graphite analysis, and at a higher concentration (25 %) for coals, being necessary in this case to carry out a dilution of samples with graphite. Strontium carbonate as a spectrochemical buffer allows to analyse satisfactorily coals and their combustion products. (Author) 13 refs.

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

    Energy Technology Data Exchange (ETDEWEB)

    Capdevila, C.

    1967-07-01

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

  8. Establishment of the conditions for the determination of the concentration of the uranyl ion in perchloric media by Fluorescence; Establecimiento de las condiciones para la determinacion de la concentracion del ion uranilo en medio perclorico por Fluorescencia

    Energy Technology Data Exchange (ETDEWEB)

    Contreras R, A.; Ordonez R, E.; Fernandez V, S.M. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)]. e-mail: contraida@yahoo.com.mx

    2004-07-01

    The influence of the p H is reported in the spectra of luminescence of the ion uranyl in sodium perchlorate 2M. The best spectra were observed to ph <3 that to neutral and basic p Hs this is explained by the present species. They were carried out four calibration curves for the uranyl in perchloric acid media, taking into account the area under the curve, the maximum height of two characteristic peaks of this ion, in those that one observes a better correlation with the maximum height of the peak located to 486.7 nm. (Author)

  9. Determination of the angular dependence of the detector matrix Matrix X-evolution of IBA; Determinacion de la dependencia angular del detector matricicial Matrix-X-evolution de IBA

    Energy Technology Data Exchange (ETDEWEB)

    Mateos, J. C.; Luis, F. J.; Sanchez, G.; Herrados, M.

    2011-07-01

    The objective of this work consists in determining the correction for the angular dependence of the detector-Evolution Matrix x matrix (IBA, Germany), when used in the multi cube dummy (IBA, Germany), verification of treatment VMAT IMRT, using the software OP'IMRT (IBA, Germany).

  10. Determination of fecal bacteriophages fecales from pre-potable waters using a simple membrane filtration technique; Determinacion de bacteriofagos fecales en aguas pre-potables por la tecnica de filtracion por membrana

    Energy Technology Data Exchange (ETDEWEB)

    Luque, A.; Basanta, A. [EMASESA. Sevilla (Spain); Fuentes, M. V.; Alonso, M. C.; Borrego, J. J. [Universidad de Malaga (Spain)

    2000-07-01

    A modification of the simple filtration technique used for the detection and enumeration of fecal bacteriophages from pre-treated and treated drinking water is described. The filters and equipments used are similar to those employed for the classical bacterial indicator analysis, and the titer of bacteriophages may be recorded in only 6 hours. The proposed modification is based on the elimination of the bacterial decontamination of the water sample by use the selective medium mFC agar; and, in addition, an optimal visualization of the lysis plaques is obtained in this medium, which avoid the use of specific stains like triphenyl tetrazolium chloride (TTC). On the other hand, the proposed modification of the technique presents a high accuracy, since bacteriophage titers of<10 pfu/100 ml of water are detected. (Author) 46 refs.

  11. Quantitative determination of alpha-quartz in airborne dust samples by x-ray diffraction; Determinacion cuantitativa de cuarzo-alfa en polvo atmosferico mediante difraccion de rayos X

    Energy Technology Data Exchange (ETDEWEB)

    Bayon, A.; Roca, M.

    1982-07-01

    The quantitative determination by X-ray diffractometry of alpha-quartz In airborne respirable dust samples on silver membrane filters is considered. A cobalt anode X-ray tube Is employed. NiO is used as Internal standard In order to compensate for both the variations of specimen absorption and the effect due to the nonuniformity of the incident X-ray beam and to the incomplete homogeneity on the filters of samples and standards. (Author) 17 refs.

  12. Determination of mean molecular weights in organic reactor coolants. III. Differential cryoscopy with thermoelectric thermometer; Determinacion de masas moleculares medias en refrigerantes nucleares organicos. III-Crioscopia diferencial con termometro termoelectrico

    Energy Technology Data Exchange (ETDEWEB)

    Becerro, E.; Carreira, M.

    1968-07-01

    The solubility problems raised by some components of the polymeric residue of irradiated polyphenolic coolants, which make it necessary to operate with very small samples, have been solved by means of a differential cryoscopic technique using a thermoelectric thermometer (thermal) as sensitive element. The method is based on the direct measurement of the difference between the freezing points of the investigated solution and of a reference solution whose concentration may be changed at will. The change of {delta} V (mV) versus c(molal) is linear, the equivalent point being determined either analytically or graphically depending on the required accuracy. The method has been tested by measurements on pure polyphenyls, using diphenyl ether as solvent. It has been also applied to the main prospective coolants for the DON reactor. Working with 10{sup 2} molal solutions the accuracy is better than {+-} 2 per cent. (Author) 2 refs.

  13. Comparación de las determinaciones de glucosa en sangre por química seca y química húmeda: su influencia en la toma de decisiones terapéuticas

    OpenAIRE

    Ma. Eugenia Dávila-Esqueda; Rosendo Silva-Ruiz; Flavio Martínez-Morales; Yazmin Rivera-Berlanga

    2000-01-01

    Objetivo: Determinar la variabilidad entre la determinación de glucosa por química seca y química húmeda y su importancia en el manejo del paciente diabético. Material y métodos: Se determinó glucosa en 106 pacientes diabéticos, en el analizador portátil con tira reactiva (Química Seca ) y por el método enzimático secuencial de glucosa oxidasa y peroxidasa ( GOD/POD ). Se incluyeron pacientes que acudieron a su control al hospital. El grado de correlación entre los dos métodos se estableció, ...

  14. Determination of {sup 222}Rn and its physico-chemical and biological characteristics in aquifers of Toluca valley; Determinacion de {sup 222}Rn y caracteristicas fisicoquimicas y biologicas en acuiferos del Valle de Toluca

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez, A.; Aranda, P.; Ceballos, S.; Cruz, D.; Jauregui, B.; Lopez, R.; Pena, P.; Salazar, S.; Segovia, N.; Tamez, E. [Instituto nacional de Investigaciones Nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    1997-07-01

    In this work it is realized a geochemical study which includes the evaluation of {sup 222} Rn concentration in drinking water wells at Toluca city and a spring water of Almoloya de Juarez municipality at State of mexico. the same is studied about evolution of {sup 222} Rn concentration in water of the hydrating which supply it to those wells. the geochemical evaluation also covers the determination of major and minor elements or trace and the biological analysis of water. The study includes two seasonal cycles, the low water mark one and other the rainy for being able to evaluate the aquifers reloading effects in the water composition. (Author)

  15. Determination of Drucker-Prager failure criterion of α-SiC green compacts; Determinacion del criterio de rotura de Drucker-Prager de compactos en verde de α-SiC

    Energy Technology Data Exchange (ETDEWEB)

    Achiaga, B.; Barea, R.; Candela, N.

    2016-08-01

    This paper is concerned with the mechanical behaviour of compacted ceramic green components of two α-SiC with different particle size-shape and purity with the purpose of evaluate the Drucker-Prager criterion in both material. Compaction pressures were between 60 and 100 MPa. The green compact were evaluated by two tests such as diametrical compression and uniaxial compression for different relative densities. These models are used both for die design as for parts design. The results show the different compression behaviour caused by the particles shape of each material. (Author)

  16. Determination and analysis of the physical chemical characteristics of witness coupons of boral for the CNLV; Determinacion y analisis de las caracteristicas fisico quimicas de cupones testigo de boral para la CNLV

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez M, J.L.; Aguilar H, F.; Rivero G, T.; Carrillo M, R. [ININ, Apdo. Post 18-1027, Col Escandon, 11801 Mexico D.F. (Mexico)]. E-mail: jlgm@nuclear.inin.mx; fah@nuclear.inin.mx; trg@nuclear.inin.mx; racm@nuclear.inin.mx

    2004-07-01

    The burnt fuel elements that are extracted in each charging of the Units 1 and 2 of the Nuclear Power Plant of Laguna Verde, are deposited in shelves placed in the storage reservoir designed for this end. Each cell or storage shelf has a structure type cage. Among the cells neutron absorber material is placed, (Boral), what allows to avoid the possible criticality that could settle down when accumulating in the storage the irradiated fuel elements. This boral has been designed to maintain its characteristics of thermal neutron absorber during a lifetime of the plant. To check that the wings and the Boral have not suffered some degradation or some change due to the environmental conditions in the warehouse, it is necessary to watch over their physical and chemical characteristics periodically, what is carried out by a surveillance program based on Badges or manufactured witness coupons of the same material that the wings. The badges witness are embedded in a special wing, which is placed in the place with more radiation in the pool. In this work the laboratory tests carried out in the ININ to the coupon witness 03 of the Unit 2, (II-03) are described, being presented the results and obtained conclusions. (Author)

  17. Spectrophotometric determination of aluminium in presence of iron with eriochrome cyanine R. Essays with a decolorated reagent; Determinacion espectrofotometrica de aluminio en presencia de hierro con eriocromocianina R. Ensayos con un reactivo decolorado

    Energy Technology Data Exchange (ETDEWEB)

    Barrachina Gomez, M.; Gasco Sanchez, L.; Fernandez Cellini, R.

    1962-07-01

    The behaviour of the extinction coefficient of aqueous solutions of Eriochrome Cyanine R is studied. It is found that at pH 5-6 the diluted acid solutions decolorate rapidly according to an exponential law (538 m{mu}). The fact that the decoloree solutions go on still reacting with the aluminium has. (Author) 12 refs.

  18. Determination of dissolved oxygen in saline waters applying mathematical methods and as a membrane electrode sensor; Determinacion de oxigeno disuelto en aguas salinas aplicando modelos matematicos y como sensor electrodo de membrana

    Energy Technology Data Exchange (ETDEWEB)

    Mayari, R.; Espinosa, M. C.; Ruiz, M. [Centro Nacional de Investigaciones Ceintificas. La Habana (Cuba); Romero, E. [Universidad de Huelva (Spain)

    2000-07-01

    This work shows as specific methodology for the determination of dissolved oxygen in saline waters that allows to consider the variations of temperature and of concentration of salts. Both factors influence the solubility of the gases in water, making possible in place measurements, in bodies of water with content of salts unto of the concentration of sea water, with greater dependability. The mathematical models obtained are shown, the errors due to equipment, as well as the results obtained when applying this methodology in saline waters with diverse levels of contamination this allows to discern when the decrease of dissolved oxygen levels is due to an increase in the salinity or to an increase in the contamination of the water body. (Author) 7 refs.

  19. Application of digital image processing to determine the causes of failures in SAE 1018 carbon steel; Aplicacion del procesamiento digital de imagenes para la determinacion de las causas que provocan fallas en el acero al carbono SAE 1018

    Energy Technology Data Exchange (ETDEWEB)

    Bolanos-Rodriguez, E [Escuela Superior de Tizayuca, Universidad Autonoma del Estado de Hidalgo, Tizayuca, Hidalgo (Mexico)]. E-mail: bola7112@yahoo.com.mx; Gonzalez-Islas, J.C. [Universidad Tecnologica de Tulancingo, Tulancingo, Hidalgo (Mexico)]. E-mail: juanc.gonzalez@utec-tgo.edu.mx; Felipe-Riveron, E.M. [Centro de Investigacion en Computacion, Instituto Politecnico Nacional, Mexico, D.F. (Mexico)]. E-mail: edgardo@cic.ipn.mx

    2013-03-15

    The research is focused on determining the causes of failures in the SAE 1018 carbon steel that is used in pipes carrying drinking water. Digital processing of images captured by photomicrographs by scanning electron microscopy coupled with the technique of X-ray microanalysis. The results demonstrate that the low quality of the raw materials and the manufacturing process of steel are the reasons for the occurrence of cracks observed in the material. [Spanish] La investigacion se centra en determinar las causas que provocan fallas en el acero al carbono SAE 1018 que es utilizado en tuberias que transportan agua potable. Se emplea el procesamiento digital de imagenes de las microfotografias captadas por medio de microscopia electronica de barrido, unido a la tecnica de microanalisis de rayos X. Los resultados obtenidos demuestran que la baja calidad de las materias primas y el proceso de manufactura del acero son las razones de la ocurrencia de fisuras observadas en el material.

  20. Analytical Issues on the Determination of Carotenoids in Microalgae by Liquid Chromatography with Diode Array Detector; Aspectos Analiticos sobre la Determinacion de Compuestos Carotenoides en Microalgas mediante Cromatografia de Liquidos con Detector de Diodos

    Energy Technology Data Exchange (ETDEWEB)

    Garcia, S.; Perez, R. M.

    2012-04-11

    A preliminary study of literature review on the determination of carotenoids in microalgae samples by HPLC with diode array detector is presented. Main objective has been focused to compile data from literature and based on the main aspects of the analytical methodology used in the determination of these compounds. The work is structured as follows and affecting major analytical difficulties: Procurement and commercial availability of standard solutions. Stage of sample treatment. Chromatographic analysis. (Author) 19 refs.

  1. Determination of the detection efficiency of a HPGe detector by means of the MCNP 4A simulation code; Determinacion de la eficiencia de deteccion de un detector HPGe mediante el codigo de simulacion MCNP 4A

    Energy Technology Data Exchange (ETDEWEB)

    Leal, B. [Centro Regional de Estudios Nucleares, A.P. 579C, 98068 Zacatecas (Mexico)

    2004-07-01

    In the majority of the laboratories, the calibration in efficiency of the detector is carried out by means of the standard sources measurement of gamma photons that have a determined activity, or for matrices that contain a variety of radionuclides that can embrace the energy range of interest. Given the experimental importance that has the determination from the curves of efficiency to the effects of establishing the quantitative results, is appealed to the simulation of the response function of the detector used in the Regional Center of Nuclear Studies inside the energy range of 80 keV to 1400 keV varying the density of the matrix, by means of the application of the Monte Carlo code MCNP-4A. The adjustment obtained shows an acceptance grade in the range of 100 to 600 keV, with a smaller percentage discrepancy to 5%. (Author)

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

    Energy Technology Data Exchange (ETDEWEB)

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

    2010-10-21

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

  3. Implementation in laboratories of Latin America of procedures of harmonized essay for the determination of the radioactive contamination of food; Implementacion en laboratorios de Latinoamerica de procedimientos de ensayo armonizados para la determinacion de la contaminacion radiactiva de alimentos

    Energy Technology Data Exchange (ETDEWEB)

    Fernandez G, I.M. [CPHR (Cuba); Iglicki, F.A. [CNEA (Argentina); Aguirre G, J. [CNSNS, (Mexico); Melo F, A.C. de [Instituto de Radioprotecao e Dosimetria, (Brazil); Tomicic M, I.J. [Comision Chilena de Energia Nuclear, (Chile); Loria M, L.G. [Centro de Investigacion en Ciencias Atomicas Nucleares y Moleculares, (Costa Rica); Diodati, J.M. [ARN, Av. Del Libertador 8250, Buenos Aires (1429), (Argentina); Vasquez B, L.R. [Comision Ecuatoriana de Energia Atomica, (Ecuador); Alarcon S, F.A. [Centro de Investigaciones y Aplicaciones Nucleares, El Salvador (El Salvador); Civil, M. [Laboratoire Veterinaire et de Controle de Qualite des Aliments, (Haiti); Naut M, B.C. [Universidad Autonoma de Santo Domingo, Republica Dominicana (Dominican Republic); Odino M, M.R. [Direccion Nacional de Energia y Tecnologia Nuclear (Uruguay); Flores M, Y.R. [Direccion General de Energia Atomica, (Venezuela); Rossbach, M. [International Atomic Energy Agency, (Austria)]. e-mail: isis@cphr.edu.cu

    2006-07-01

    In Latin America, nowadays, it is not had harmonized essay procedures for the determination of radioactive contaminants in foods. Equally, the great diversity of institutions that in each country are devoted to carry out this control and the difference in the level that its possess the same ones in quality matter, its impose the necessity to implant a Quality Management System on the base of harmonized technical criteria that its help to obtain reliable analytical results. With this end, it was proposed and it was approved the ARCAL LXXIX regional project: 'Harmonization of the technical and specific requirements of quality for the control of the radioactive contamination of foods'. In this work the aspects more significant of the design and content of the Manual of technical procedures for the determination of radioactive contaminants in foods, elaborated in the marks of the one referred project are presented. The same one includes eight procedures for the previous treatment of the samples, the spectrometric determination of gamma emitters radionuclides, the determination of the alpha activity indexes and total beta, of {sup 131} I, {sup 89,90} Sr, {sup 226} Ra, {sup 238,} {sup 239} Pu and {sup 3} H, using different methodologies validated in the region. The actions carried out to implement this Manual are also exposed. (Author)

  4. Spectrophotometric determination of uranium with arsenazo previous liquid-liquid extraction and colour development in organic medium; Determinacion espectrofotometrica de uranio con arsenazo, previa extraccion y desarrollo del color en medio organico

    Energy Technology Data Exchange (ETDEWEB)

    Palomares Delgado, F.; Vera Palomino, J.; Petrement Eguiluz, J. C.

    1964-07-01

    The determination of uranium with arsenazo is hindered by a great number of cation which form stable complexes with the reactive and may given rise to serious interferences. By studying the optimum conditions of uranium the extraction be means of tributylphosphate solutions dissolved in methylisobuthylketone, under conditions for previous masking of the interfering cations, an organic extract was obtained containing all the uranium together with small amounts of iron. The possible interference derived from the latter element is avoided by reduction with hydroxylammoniumchlorid followed by complex formation of the Fe(II)-ortophenantroline compound in alcoholic medium. (Author) 17 refs.

  5. Determination of average molecular weights on organic reactor coolants. II.-Freezing point depression method for diphenyl-ether solutions; Determinacion de masas moleculares medias en refrigerantes nucleares organicos. II.- Crioscopia de disoluciones en eter difenilico

    Energy Technology Data Exchange (ETDEWEB)

    Carreira, M.

    1965-07-01

    In order to reduce limitations of solubility, the cryoscopic method developed for benzene solutions of polyphenyl mixtures has been extended to diphenyl-ether solutions by introducing some modifications imposed by the physico-chemical properties of this solvent. The Nernsto theory of Beckman's method has been revised, taking into account the heat-transfer characteristics of the system, and the results of that analysis have been used to fix upon the design parameters of a cryoscopic apparatus for measurements on diphenyl-ether solutions. (Author) 9 refs.

  6. Spectrophotometric determination of Fe(II) in Geological Materials by Using Ferrozine as Cromogenic Reagent; Determinacion Espectrofotometria de Fe(II) en Materiales Geologicos Utilizando Ferrozina como Reactivo Cromogenico

    Energy Technology Data Exchange (ETDEWEB)

    Sanchez, D. M.; Martin, R.; Marin, J.; Morante, R.; Gutierrez, L.; Bayon, A. [Ciemat, Madrid (Spain)

    2000-07-01

    A rapid and sensitive spectrophotometric method for the determination of labil ferrous iron in geological materials is described. Samples are trated by boiling with hydrochloric acid for 60 min. in an atmosphere of carbon dioxide. Systematic erroneous results due to high concentrations of ferric iron are resolved. The limit of detection for the method was 0.02% of FeO. International standard granites analysed by the proposed method showed recoveries ranged from 81-102%. (Author) 9 refs.

  7. Determination of damage and In vivo DNA repairing through the unicellular in gel electrophoresis technique; Determinacion del dano y la reparacion del ADN In vivo mediante la tecnica de electroforesis unicelular en gel

    Energy Technology Data Exchange (ETDEWEB)

    Mendiola C, M.T.; Morales R, P. [Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    1997-07-01

    The experimental conditions were standardized for the unicellular in gel electrophoresis technique setting up (EUG) at the Cellular Radiobiology laboratory. Preliminary experiments were realized with human cells and mouse which were exposed to ionizing radiation or hydroxide peroxide (H{sub 2}O{sub 2}) to induce DNA damage and to verify the technique performance. It was analysed the In vivo repairing kinetics of induced damage by gamma radiation in mouse leukocytes which were exposed to {sup 137} Cs source and taking samples of peripheric blood of the tail of each mouse at different exposure times and processing them for EUG. In function of the cells proportion with damage in each time it was determined the existence of fast repairing mechanism at the first 15 minutes followed by a slight increase in the damage and a late repairing stage between 30 and 90 minutes. It was analysed this behavior and the potentiality of this In vivo system. (Author)

  8. Regression models in the determination of the absorbed dose with extrapolation chamber for ophthalmological applicators; Modelos de regresion en la determinacion de la dosis absorbida con camara de extrapolacion para aplicadores oftalmologicos

    Energy Technology Data Exchange (ETDEWEB)

    Alvarez R, J.T.; Morales P, R

    1992-06-15

    The absorbed dose for equivalent soft tissue is determined,it is imparted by ophthalmologic applicators, ({sup 90} Sr/{sup 90} Y, 1850 MBq) using an extrapolation chamber of variable electrodes; when estimating the slope of the extrapolation curve using a simple lineal regression model is observed that the dose values are underestimated from 17.7 percent up to a 20.4 percent in relation to the estimate of this dose by means of a regression model polynomial two grade, at the same time are observed an improvement in the standard error for the quadratic model until in 50%. Finally the global uncertainty of the dose is presented, taking into account the reproducibility of the experimental arrangement. As conclusion it can infers that in experimental arrangements where the source is to contact with the extrapolation chamber, it was recommended to substitute the lineal regression model by the quadratic regression model, in the determination of the slope of the extrapolation curve, for more exact and accurate measurements of the absorbed dose. (Author)

  9. Practical determination of alkalinity in waters and usefulness of the saturation-equilibrium indexes; Determinacion practica de la alcalinidad de un agua y utilidad de los indices de sturacion y equilibrio

    Energy Technology Data Exchange (ETDEWEB)

    Marin Galvin, R.; Rodriguez Mellado, J. M. [Universidad de Rabanales. Cordoba (Spain)

    2000-07-01

    A practical study related to the carbonic equilibrium has been carried out over 24 natural and treated waters. In this way, carbonic equilibrium is undoubtedly essential to lead the physicochemical behaviour of aquatic systems. Experimental results demonstrate that alkalinity analysis by Gran's titulation yield values 75% lower than those obtained by alkalimetric titulation (AT). Nevertheless, determination of the end valoration point is more objective with Gran's than with alkalimetric titulation. Thus, Gran's could be a better technique to measure alkalinity values lower than 200 mg/l of HCO3-and TAC for higher values. On the other way, the calculated values of equilibrium pH (pHE) and Langelier's and Ryznar's indexes (iL and iR) inform qualitatively about the carbonic behaviour in the 60% of studied waters. Moreover, the time of 48 hours applied in the calcite assay must be increased up to around 7 days to yield results more consistent according to the practical carbonic behaviour of waters. Finally, it is necessary to carry out deeper studies about alkalinity of waters to obtain sounder conclusions. (Author) 7 refs.

  10. Determination of silicon and chromium content in gray cast iron by the Van der Pauw method; Determinacion del contenido de silicio y cromo en fundiciones grises mediante el metodo de Van der Pauw

    Energy Technology Data Exchange (ETDEWEB)

    Tremps, E.; Enrique, J. L.; Moron, C.; Garcia, A.; Gomez, A.

    2013-07-01

    In this paper we show a system based on the resistivity measurement of samples of gray cast iron by the Van der Pauw method to calculate the silicon content in the samples. Twenty five trials have been carried out, studying resistive and metallographic characteristics of the samples. This has demonstrated that it is possible to obtain, by this method, the silicon content in molten flat with low content of alloying elements, also the content of chromium in series smelters where the rate of silicon remains constant. (Author)

  11. Determination of the level of water in the core of reactors PWR using neutron detectors signal ex core; Determinacion del nivel del agua del nucleo de reactores PWR usando la senal de detectores neutronicos excore

    Energy Technology Data Exchange (ETDEWEB)

    Bernal, A.; Abarca, A.; Miro, R.; Verdu, G.

    2014-07-01

    The level of water from the core provides relevant information of the neutronic and thermal hydraulic of the reactor as the power, k EFF and cooling capacity. In fact, this level monitoring can be used for prediction of LOCA and reduction of cooling that can cause damage to the core. There are several teams that measure a variety of parameters of the reactor, as opposed to the level of the water of the core. However, the detectors 'excore' measure fast neutrons which escape from the core and there are studies that demonstrate the existence of a relationship between them and the water level of the kernel due to the water shield. Therefore, a methodology has been developed to determine this relationship, using the Monte Carlo method using the MCNP code and apply variance reduction techniques based on the attached flow that is obtained using the method of discrete ordinates using code TORT. (Author)

  12. Determination of the stability constants of lanthanum, praseodymium, europium, erbium and lutetium complexes with chloride ions; Determinacion de las constantes de estabilidad de los complejos de lantano, praseodimio, europio, erbio y lutecio con iones cloruro

    Energy Technology Data Exchange (ETDEWEB)

    Fernandez R, E. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    2008-07-01

    The stability constants of La{sup 3+}, Pr{sup 3+}, Eu{sup 3+}, Er{sup 3+} and Lu{sup 3+} chloride complexes were determined in perchloric acid media using a liquid-liquid extraction method. The dinonyl napthalene sulfonic acid in n-heptane was used as extractant. The lanthanide (Ln) concentrations were measured by a radiochemical (Eu and Lu) and a spectrophotometric (La, Pr, and Er) methods. In the last method, xylenol orange was used for the determinations at ph 6. The stability constants of lanthanum, praseodymium, erbium and lutetium chloride complexes were determined in 2, 3 and 4 M ionic strength and europium in 1, 2 and 3 M, at 303 K. The fitting of experimental data to the equations for the calculation of the stability constants, was carry out considering both one chemical species (LnCl{sup 2+}) or two chemical species (LnCl{sup 2+} and LnCl{sub 2}{sup +}). The Specific Ion Interaction Theory was applied to the values of log {beta}{sup I}{sub Ln},{sub Cl} and the first stability constants at zero ionic strength were calculated by extrapolation. The same theory could not be applied to the log {beta}{sup I}{sub Ln},{sub 2Cl}, due to its low abundance and the values determined for the stability constants were similar. The distribution diagrams of the chemical species were obtained using the program MEDUSA and considering log {beta}{sup I}{sub Ln},{sub CI}, log {beta}{sup I}{sub Ln},{sub 2CI} values obtained in this work and the hydrolysis constants taken from the literature. The lanthanide chloride complexes are present in solution at specific conditions of ionic strength, concentration and in the absence of hydrolysis. The log {beta}{sup I}{sub Ln},{sub Cl} data were related to the charge density and the corresponding equations were obtained. These equations could be used to determine the stability constants along the lanthanide series. (Author)

  13. Determination of the ratio between phosphorus and uranium in surface waters selected in the State of Mexico; Determinacion de la relacion entre fosforo y uranio en cuerpos de agua seleccionados en el Estado de Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Ordonez R, E

    2001-07-01

    The agricultural regions lately, they have suffered a severe contamination for the big ones quantities of chemical fertilizers and of pesticides applied to improve their production and quality, increasing these in areas with temperatures but you lower that the average. For the importance of the physicochemical processes that they are made in the waters to settle down surface near to agricultural fields, the physicochemical characteristics were analysed of these waters to determine the contributions that they carry out the phosphate fertilizers that are carried by the escorrentia toward the borders and to make a pursuit of their variability during an agricultural cycle, in times of the summertime and of rains, as well as to observe the effect of the depth in these physicochemical properties. Its were sampling three borders and a spring that it served of white, all them located in the suburbs of the Xinantecatl (Nevado de Toluca), municipality of Zinacantepec, State of Mexico, area with the temperatures but drops registered in the region. They were carried out samplings in the first days of the months of April, July and November. The points of those sampled borders were the influent, the effluent and 3 different depths (lm, 3m and 5m). where was not possible sampling all the points, its were sampling only the one influent and the effluent. The selected physicochemical parameters were the temperature, the pH, the conductivity electric and the one oxygenates dissolved This determination in situ you carries out with a team portable of type Check-Mate, of interchangeable electrodes. The certain anions they were phosphates, nitrates, sulfates and bicarbonates; the measurement of the concentration of anions, one carries out for ultraviolet-visible light spectroscopy and titration. The cations analysed they were sodium, potassium, iron, calcium and magnesium. The cations concentration was determined by atomic absorption spectroscopy. The determination of the uranium concentration it was made by means of neutron activation analysis. The physicochemical parameters diminished of value in the temporary analysis, as long as those anions and the cations didn't show a behavior defined in this same analysis, while in the analysis in depth these parameters presented minimum changes. In the modelling one for computer packages, the results of the speciation analysis chemistry, by means of the Medusa program, they revealed that the species of uranium in solution but abundant they were phosphate uranyl monoacid, tris uranyl carbonate and bis uranyl carbonate and, in smaller proportion, the species of aqueous uranyl hydroxide. The characterization of waters for the program GWW gave as a result that the facies but representative it was the bicarbonate magnesia. In the study of the quality of the one it dilutes with ends of agricultural watering, they were classified as capable for this purpose. The analysis statistical one carries out with base in the correlation coefficient whose value among the uranium and the match is moderated in three sampling points. (Author)

  14. Determination of the dose rapidity of a {sup 90} Sr beta radiation source using thermoluminescent dosemeters; Determinacion de la rapidez de dosis de una fuente de radiacion beta de {sup 90}Sr usando dosimetros termoluminiscentes

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez M, P.R.; Azorin N, J.; Rivera M, T. [Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    2000-07-01

    The thermoluminescent dosemeters developed in Mexico, have been used efficiently in environmental and personal dosimetry. When the dose rate of some source is not known can be estimated with the use of thermoluminescent dosemeters taking in account the geometrical array used in the irradiations for reproducibility of the results in posterior irradiations. In this work it was estimated the dose rate of a {sup 90} Sr-{sup 90} Y beta radiation source which is property of the Nuclear Sciences Institute, UNAM, therefore it was l ended to the Metropolitan Autonomous University- Iztapalapa Unit for the characterization of new Tl materials, taking account of the institutional collaboration agreements. (Author)

  15. Determination of lead in clay enameled by X-ray fluorescence technique in Total reflection and by Scanning Electron Microscopy; Determinacion de plomo en esmaltado de barro por Fluorescencia de rayos X en reflexion total y Microscopia Electronica de Barrido

    Energy Technology Data Exchange (ETDEWEB)

    Zarazua O, G.; Carapia M, L. [Instituto Nacional de Investigaciones Nucleares, C.P. 52045 Estado de Mexico (Mexico)

    2000-07-01

    This work has the objective of determining lead free in the glazed commercial stewing pans using the X-ray fluorescence technique in Total reflection (FRX) and the observation and semiquantitative determination of lead by Analytical Scanning Electron Microscopy (ASEM). (Author)

  16. Determination of cross-section starting from a decay curve composed of two halves lives; Determinacion de la seccion eficaz a partir de una curva de decaimiento compuesta de dos vidas medias

    Energy Technology Data Exchange (ETDEWEB)

    Martinez Q, E.; Aguilera, E.F. [Instituto Nacional de Investigaciones Nucleares, Departamento del Acelerador, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    1998-07-01

    It is presented a method developed to determine the cross section of 3n channel of the fusion reaction {sup 6} He + {sup 209} Bi which is based in the {alpha} decay curve of residual nucleus, {sup 212} At. (Author)

  17. Analytical Evaluation to Determine Selected PAHs by HPLC in a Type 2 Fuel; Evaluacion Analitica de 4 Metodos de Determinacion de PAHs medianteHPLC en un Fuel de Tipo II

    Energy Technology Data Exchange (ETDEWEB)

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

    2009-05-21

    An evaluation of analytical parameters to determine selected PAHs in a fuel oil type II by HPLC coupled to fluorescence and diode detectors is presented. The study was focused on four conventional treatments of these kinds of oil samples and the main objective was giving a measure of confidence level of PAH results in the fuel oil. This study was performed in the frame of the project Assessment of natural attenuation of PAHs in agricultural soil contaminated with fuel from an accidental spill (Spanish National Plain I+D+I, CTM2007-64537). This paper is presented as follows: Analysis of reference material 1582 (NIST) by using the four kinds of sample treatments of interest. Application of variance analysis to compare results obtained from type II fuel by using each sample treatment and chromatographic detector. Finally, a statistic calculation was performed to measure uncertainty components in chromatographic analysis. (Author)

  18. Determination of Fe-55 and Ni-63 in Environmental Samples. Analytical Problems. Characteristic Limits. Automatized Calculation; Determinacion de 55{sup F}e y 63{sup N}i en Muestras Ambientales. Problemas Analiticos. Limites Caracteristicos. Calculo Automatizado

    Energy Technology Data Exchange (ETDEWEB)

    Gasco, C.; Navarro, N.; Gonzalez, P.; Heras, M. C.; Gapan, M. P.; Alonso, C.; Calderon, A.; Sanchez, D.; Morante, R.; Fernandez, M.; Gajate, A.; Alvarez, A.

    2008-08-06

    The Department of Vigilance Radiologica y Radiactividad Ambiental from CIEMAT has developed an appropriate analytical methodology for Fe-55 and Ni-63 sequential determination in environmental samples based on the procedure used by RIS0 Laboratories. The experimental results obtained in the mayor and minor elements behaviour (soil and air constituents) in the different types of resins used for separating Fe-55 and Ni-63 are showed in this report. The measuring method of both isotopes by scintillation counting has been optimized with Ultima Gold liquid with different concentrations of stable element Fe and Ni. The decontamination factors of different gamma-emitters are experimentally determined in this method with the presence of soil matrix. The Fe-55 and Ni-63 activity concentrations and their associated uncertainties have been calculated from the counting data and sample preparation. A computer application has been implemented in Visual Basic in excel sheets for: (I) obtaining the counting data from spectrometer and counts in each window, (II) representing graphically the background and sample spectrums, (III) determining the activity concentration and its associated uncertainty and (IV) calculating the characteristic limits using ISO 11929 (2007) with various confidence levels. (Author) 30 refs.

  19. Sampling procedure, receipt and conservation of water samples to determine environmental radioactivity; Procedimiento para el muestreo, recepcion y conservacion de muestras de agua para la determinacion de la radiactividad ambiental

    Energy Technology Data Exchange (ETDEWEB)

    Herranz, M.; Navarro, E.; Payeras, J. (and others)

    2009-07-01

    The present document informs about essential goals, processes and contents that the subgroups Samling and Samples Preparation and Conservation believe they should be part of the procedure to obtain a correct sampling, receipt, conservation and preparation of samples of continental, marine and waste water before qualifying its radioactive content.

  20. Determination of gamma radioactivity in aerosols in air for environmental radiological surveillance; Determinacion en continuo de la radiactividad gamma en aerosoles en aire con fines de vigilancia radiologica ambiental

    Energy Technology Data Exchange (ETDEWEB)

    Blas, A. de; Toral, J.; Riego, A.; Sanchez, J.; Sanchez, R.; Tapia, C.; Batalla, E.

    2012-07-01

    The objective is the development of a detection equipment of gamma radiation in aerosols in the atmosphere. Equipment allows periodic spectrometry continuously, identifying the gamma emitters and their corresponding specific activity. This team consists of a compact instrumentation and scintillation detector.

  1. Spectrographic determination of impurities in ammonium hydrogen fluoride samples. II. Study of the behaviour of the added matrices; Determinacion espectrografica de impurezas en bibluoruro amonico. II. Estudio del comportamiento de las matrices adicionadas

    Energy Technology Data Exchange (ETDEWEB)

    Alduan, F. A.; Roca, M.; Capdevila, C.

    1979-07-01

    In order to account for the variations In the shape of the excitation-volatilization' curves and the values of the line intensities of the different impurities determined in ammonium bifluoride, the behaviour of the added matrices (graphite, 63203, GeO{sub 2}, MgO and ZnO) has been considered. With this aim the influence of the added matrices on the are discharge parameters (temperature and electronic concentration) and on the exhaustion rate of the electrode load as a function of the excitation time has been studied. On the other hand, the curve of variation of the line intensity of the metallic component of each matrix versus time has been obtained and the residues in the electrode cavity have been investigated by X-ray powder diffraction. (Author) 7 refs.

  2. Simultaneous determination of Ra-226, natural uranium and natural thorium by gamma-ray spectrometry INa(Ti), in solid samples.; Determinacion de U (Natural), Th (Natural) y Ra-226 en diversos materiales, mediante espectrometria con INa (TI)

    Energy Technology Data Exchange (ETDEWEB)

    Salvador, S.; Navarro, T.; Alvarez, A.

    1991-07-01

    A method has been developed to determine activities of Ra-226, natural uranium and natural thorium by gamma-ray spectrometry. The measurement system has been calibrated using standards specially prepared at the laboratory. It is necessary to assume secular equilibrium in the samples, between Ra-226 and Th-232 and its daughters nuclides, and between U-238 and its immediate daughter Th-234, as the photo peaks measured are those of the daughters. The results obtained indicate that this method can of ter replace the radiochemical techniques used to measure activities in this type of sample. The method has been successfully used to determine these natural isotopes in samples from uranium mills. (Author) 9 refs.

  3. Preparation and determination of the luminescent characteristics of ZrO{sub 2} in powder; Preparacion y determinacion de las caracteristicas luminiscentes del ZrO{sub 2} en polvo

    Energy Technology Data Exchange (ETDEWEB)

    Rivera M, T. [ESIME-IPN Unidad Culhuacan Mexico D.F. (Mexico); Olvera T, L.; Azorin N, J.; Soto E, A.M.; Velazquez O, C.; Campero C, A. [UAM-I, 09340 Mexico D.F. (Mexico)

    2004-07-01

    In this work the luminescent characteristics of the ZrO{sub 2} are presented using the method of Thermally Stimulated Luminescence (TSL), also called thermoluminescence (Tl). The powders of ZrO{sub 2} were obtained by two preparation methods: for precipitation and for evaporation of Sol-gel. The luminescent characteristics of the ZrO{sub 2} are determined using a lamp of radiation of UV light and a radiation source of beta particles of {sup 90}Sr/{sup 90}Y. Using the method of thermal stimulation the curve representative thermoluminescent of the previously irradiated material was obtained. The curve Tl of the ZrO{sub 2} irradiated with UV light presents a maximum in 180 C. Likewise, the spectrum of the curve Tl of the ZrO{sub 2} irradiated with particles beta presents a maximum centered in 181 C. While using gamma radiation like excitement source one has a spectrum with a peak centered in 184 C. When subjecting the materials obtained by sol-gel to a process of calcination at 1000 C for 24 hours a curved Tl it presents with two maxim in 185 and in 290 C respectively. The intensity of the response induced in the material it is a decisive factor to continue studying the dosimetric characteristics of the ZrO{sub 2} what allows to consider it as a potential material to use it in the beta particle dosimetry and of the UV light using the thermoluminescence method (Tl). (Author)

  4. Preparation and determination of kerma for Iridium 192 sources of low dose rate for brachytherapy; Preparacion y determinacion del kerma de fuentes de iridio-192 de baja tasa de dosis para braquiterapia

    Energy Technology Data Exchange (ETDEWEB)

    Tendilla, J.I.; Tovar M, V.; Mitsoura, E.; Aguilar H, F.; Alanis M, J. [Instituto Nacional de Investigaciones Nucleares, C.P. 52045-1, Salazar, Esrado de Mexico, D.F. (Mexico)

    2000-07-01

    The practice of Brachytherapy with Iridium-192 sources of low dose rate (0.4 - 0.8 Gy/h) is a technique used in the treatment of diverse illnesses. in this work the preparation, quality control and calibration are presented in terms of kerma in air of Iridium-192 using as target these recycled Iridium-Platinum wires. The targets were obtained as decayed sources of different radio therapeutical centers in the country and they were characterized by Scanning electron microscopy in order to determine their chemical composition. Subsequently it was developed an experimental design to establish the effect of neutron flux, geometrical array and irradiation time over the activity and percentage of the sources homogeneity. The homogeneity was determined by auto radiography and by Gamma spectroscopy. Once the optimal irradiation conditions were established, it is determined the apparent activity and kerma in air using a well type ionization chamber with traceability to a primary laboratory. Iridium-192 sources were obtained with an average homogeneity 96 %, apparent activity 282.129 {+-} 0.531 M Bq and kerma in air 0.03200 {+-} 0.00006 m Gy m/h A. (Author)

  5. Determination of stresses caused by fluctuation of acoustic load in the steam dryers of a BWR; Determinacion de esfuerzos originados por fluctuacion de carga acustica en los secadores de vapor de un reactor BWR

    Energy Technology Data Exchange (ETDEWEB)

    Centeno P, J.; Quezada G, S.; Prieto G, A.; Vazquez R, A.; Espinosa P, G. [Universidad Autonoma Metropolitana, Unidad Iztapalapa, Av. San Rafael Atlixco No. 186, Col. Vicentina, 09340 Mexico D. F. (Mexico); Nunez C, A., E-mail: javcuami26@hotmail.com [Comision Nacional de Seguridad Nuclear y Salvaguardias, Dr. Jose Ma. Barragan No. 779, Col. Narvarte, 03020 Mexico D. F. (Mexico)

    2014-10-15

    The extended power up-rate (EPU) in a nuclear power plant cause various problems in BWR components also in the steam system. This due to increased steam flow generated in the reactor and is conveyed to the turbine by the four main steam lines (MSL). One of the most serious problems is the generation of acoustic pressure loads in the metal structure of the steam dryer which eventually leads to fatigue failure and even the appearance of cracks, and in turn it causes loose parts that are entrained by the steam and transported in the MSL. This problem is due to the fluctuation of load acoustics caused by the union of the safety or relief valves (SRV) with the MSL, spreading through these to reach the reactor pressure vessel (RPV) where the effect of resonance of the acoustic wave is amplified and impacts directly in the supporting structure of the steam dryer, skirt and the panels where the mixture liquid-steam is dried, by centrifugation effect and runoff of liquid water. Efforts in the steam dryer operating conditions of EPU for two cases will be analyzed in this work, the first is before the installation of Acoustic Side Branch (ASB), and in the second case we consider the installation of said ASB in the standpipes of SRV. The analysis was performed with numerical experiments on a platform for computational fluid dynamics with virtual geometries previously designed based on the actual components of the reactor and steam system. The model to study is delimited by the top of the RPV, the steam dryer and a section of each of the four MSL with ten standpipes of SRV. With the obtained data and considering the mechanical-structural properties of the steam dryer material, we can evaluate the mechanical resistance to impacts by acoustic pressure load and its possible deformation or cracking. (Author)

  6. Application of the methodology of surface of answer in the determination of the PCT in the simulation of a LOFT; Aplicacion de la metodologia de superficies de respuesta en la determinacion del PCT en la simulacion de un LOFT

    Energy Technology Data Exchange (ETDEWEB)

    Alva N, J. [IPN, Escuela Superior de Fisica y Matematicas, Departamento de Ingenieria Nuclear, Av. IPN s/n, Col. Lindavista, Mexico 07738 D.F. (Mexico); Ortiz V, J.; Amador G, R. [ININ, 52750 La Marquesa, Estado de Mexico (Mexico)]. e-mail: neriaesfm@gmail.com

    2008-07-01

    This article summarizes the main typical of the methodology of surfaces and answer (MSA) and its connections with the lineal regression analysis. Also, an example of the application of MSA in the prediction of the principle cladding temperature (PCT) of a combustible assembly of a nuclear reactor, whose used data were taken from the simulation of a LOFT (Loss Of Fluid Test) during a course of experts. The made prediction will be used like one first approach to predict the behavior of the PCT, this is made in order to diminish the time of calculation when realizing the executions of codes thermal hydraulics of better estimation. The present work comprises of the theoretical base of the project in charge to delineate a methodology of uncertainty analysis for codes of better estimation, employees in the thermal hydraulics analysis and safety of plants and nuclear reactors. The institutions that participate in such project are: ININ, CFE, IPN and CNSNS, is possible to mention that this project is sponsored by the IAEA. (Author)

  7. Determination of absorbed dose in crystalline and thyroid gland with irradiation protocols applied in orthopantomography equipment for dental examination; Determinacion de dosis absorbida en cristalino y glandula tiroides con protocolos de irradiacion aplicados en equipos de ortopantomografia para panoramica dental

    Energy Technology Data Exchange (ETDEWEB)

    Munoz A, A. A.; Ramirez A, L. M. [Instituto Tecnologico Metropolitano, Grupo de Investigacion e Innovacion Biomedica, Medellin, Antioquia (Colombia); Sosa A, M. A.; Azorin V, J. C.; Vallejo H, M. A. [Universidad de Guanajuato, Departamento de Fisica, Loma del Bosque 103, Lomas del Campestre, 37150 Leon, Guanajuato (Mexico)

    2016-10-15

    Ionizing radiations are very useful in the medical field for the diagnostic use of different pathologies. Currently there are different technologies for diagnostic imaging using conventional X-ray, computed tomography, mammography, angiography, dental panoramic X-ray, among others. However, it should be noted that exposure to radiation in this type of diagnostic tests has increased considerably in recent years, because radiological examinations are not always carried out according to the actual clinical needs of each patient, increasing the risk to develop cancer. In this paper, the absorbed dose in the lens and thyroid gland was measured with the help of TLD-100 dosimeters located in a PMMA phantom adapted for orthopantomography (dental panoramic X-ray) equipment in 5 hospitals; using the parameters pre-configured for normal adult for irradiation. A Harshaw 3500 equipment was used to read the dosimeters, obtaining a value of 1.324 ± Sd 0.01 mGy for crystalline and 1.044 ± Sd 0.03 mGy values which are intended to be validated under other conditions and protocols. (Author)

  8. Determination of activity by gamma spectrometry of radionuclides present in drums of residues generated in nuclear centrals; Determinacion de actividad por espectrometria gamma de radionucleidos presentes en tambores de residuos generados en centrales nucleares

    Energy Technology Data Exchange (ETDEWEB)

    Aguiar, J.C.; Fernandez, J. [Autoridad Regulatoria Nuclear, Av. Del Libertador 8250, Ciudad Autonoma de Buenos Aires (Argentina)]. e-mail: jaguiar@cae.arn.gov.ar

    2006-07-01

    The generation of radioactive residuals in nuclear centrals as CNA I (Atucha I Nuclear Central) and CNE (Embalse Nuclear Central) makes that the measurement of those radionuclides has been a previous stage to the waste management. A method used in those nuclear centrals it is the gamma spectrometry with HPGe detectors, previous to the immobilization of the residual in a cemented matrix, with this the contact with the external agents and its possible dispersion to the atmosphere in the short term is avoided. The ARN (Nuclear Regulatory Authority) of Argentina it carries out periodically intercomparisons and evaluations of the measurement and procedures systems used in the nuclear power stations for the correct measurement and determination of activity of radioactive residuals by gamma spectrometry. In this work an independent method of measurement is exposed to the nuclear power stations. To determine the activity of the residuals by gamma spectrometry deposited in drums, it is required of the precise knowledge of the efficiency curve for such geometry and matrix. Due to the RNA doesn't have a pattern of these characteristics, a mathematical model has been used to obtain this efficiency curve. For it, it is necessary to determine previously: 1) the geometric efficiency or solid angle sustained by the source-detector system (drum-detector) applying a mathematical model described in this work. 2) To estimate the auto-attenuation factor that present the photons in the cemented matrix, these calculations are carried out with a simple equation and its are verified with the Micro Shield 6.10 program. The container commonly used by these nuclear power stations its are drums for 220 liters constructed with SAE 1010 steel and with a thickness of 0.127 cm, with an approximate weight 7.73 Kg., internal diameter of 57.1 cm, and height: 87 cm. The results obtained until the moment register a discrepancy from 5 to 10% with relationship to the measurements carried out by the nuclear power stations. (Author)

  9. Avance de la interpretación Geotectónica del emplazamiento del plutón granítico de Madridejos (Toledo, basada en determinaciones gravimétricas

    Directory of Open Access Journals (Sweden)

    Berjamín, J. F.

    1986-10-01

    Full Text Available The outcrops and subsurface geometry of Madridejos granitic body, has been studied using gravimetric and geological methods.
    This pluton is emplaced in a border of Urda-Consuegra antiform, this structure is high modification in the border where the pluton is emplaced.

    En función de datos gravimétricos y geológicos se establecen los límites del plutón granítico de Madridejos, tanto superficialmente como en profundidad.
    Este plutón se aloja en un extremo del domo de Urda-Consuegra, estructura a la que modifica sustancialmente.

  10. Calibration of a Gamma Spectrometry System Used for the Determination of Cs-137 in Spanish Soils; Puesta a Punto de un sistema de Expectrometria Gamma para la Determinacion de Cs-137 en Suelos Espanoles

    Energy Technology Data Exchange (ETDEWEB)

    Barreraa, M.; Romero, M. L.; Valino, F.

    2008-07-01

    The document describes the methodology used at CIEMAT in order to determine, by gamma spectrometry, the background levels of the radionuclide Cs-137 in soils of the Spanish peninsular territory. the work is a part of an extensive research project developed jointly by the University of the Basque Country (UPV-EHU) and the CIEMAT, endellite Content and migration of radiocaesium and radiostrontium in Spanish soils, which is funded by the Plan I+D of the Spanish Nuclear Security Council (CSN). The objective of the project is to establish the reference levels of man-made radionuclides in Spanish soils, with respect to which the evaluation of a possible posterior accidental release of radioactive material could be appraised. The activity concentration of the fission products Cs-137 has been determined in 34 soil cores extracted from representative Spanish soils type zones. This publication describes the experimental system employed, its calibration, the particular conditions applied to perform the measurements, as well as the experimental validation of the methodology. The activity profiles and inventories of the radioactive element so obtained are also presented. The estimation of the background Cs-137 reference levels, will provide a basis for later applications as the study of the spatial distribution in the region, the determination of the correlation between the deposited activity and the meteorological conditions, or the calculation of the specific migration parameters of the radioactive elements in Mediterranean conditions. (Author) 15 refs.

  11. A Simple Analytical Method Using HPLC with Fluorescence Detection to Determine Selected Polycyclic Aromatic Compounds in Filter Samples; Metodo Analitico Sencillo para la Determinacion de Compuestos Aromaticos Policiclicos en Muestras de Filtros mediante HPLC con Detector de Fluorescencia

    Energy Technology Data Exchange (ETDEWEB)

    Garcia, S.; Perez, R. M.

    2014-06-01

    A study on the comparison and evaluation of a miniaturized extraction method for the determination of selected PACs in sample filters is presented. The main objective was the optimization and development of simple, rapid and low cost methods, minimizing the use of extracting solvent volume. The work also includes a study on the intermediate precision. (Author)

  12. Flat friction tests applied to austenic stainless steels with several surface finish. Analysis of adhesion conditions in friction; Ensayos de rozamiento plano sobre aceros inoxidables austeniticos con diferente acabado superficial. Determinacion de las condiciones de adhesion en el rozamiento

    Energy Technology Data Exchange (ETDEWEB)

    Coello, J.; Miguel, V.; Ferrer, C.; Calatatyd, A.; Martinez, A.

    2008-07-01

    The main purpose of this work is to evaluate the tribological behaviour of austenic stainless steels AISI 304 with bright surface finishing (B). The assays have been carried out in flat faced dies system with mineral oil of 200 cts viscosity, S{sub 2}Mo grease and in dry conditions. The relationship between friction coefficient and pressure and velocity has been established for the mineral oil as lubricant. In these conditions, a strong adhesive tendency has been found in boundary lubrication regime. The results obtained here, show us that S{sub 2}Mo grease leads to lowest values for the friction coefficient. A minor adhesive behaviour tendency for AISI 316 steel, harder than 304 grades, has been found. A relevant plowing phenomena has been observed for the more critical friction conditions tried out. A surface hardener is produced as a consequence of that. (Author) 19 refs.

  13. Determination of parameters of image quality a system of image guided radiotherapy based on CBCT; Determinacion de los parametros de calidad de imagen de un sistema de imagen guiada en radioterapia basado en CBCT

    Energy Technology Data Exchange (ETDEWEB)

    Gutierrez Ramos, S.; Luis Simon Florencio, J.; Rodriguez Alarcon, C.; Vicent Granado, D.; Herrador Cordoba, M.

    2013-07-01

    In modern radiotherapy image-guided treatments constitute one of the fundamental advances. Therefore the knowledge of the goodness of its operation is essential for the correct application of the treatment. The objective of this study is to determine the quality parameters of a system of image guided recently acquired by our Center, and compare them with those specified by the manufacturer and those published in the literature. (Author)

  14. Determination of the flows profile in the role of power in the central thimble of TRIGA Mark III Reactor; Determinacion del perfil de flujos en funcion de la potencia en el dedal central del Reactor Triga Mark III

    Energy Technology Data Exchange (ETDEWEB)

    Garcia F, A.

    2010-07-01

    The overall objective of the thesis project is to determine the flow profiles sub cadmic and epi cadmic in the central thimble to different powers and operation times of TRIGA Mark III Reactor, using activation foils as detectors. In the reactor operation, it is necessary to know the neutron flow profile for to realize other tasks as: the radioisotopes production, research in reactors physics and fuel burning. The distribution of the neutron flow, accurately reflects what is happening in the reactor core, plus the flows value in this distribution is directly related to the power generated. For this reason it is performed the sub cadmic flow measurement with energies between 0 and 0.4 eV (energy of the cadmium cut E{sub cd} approx 0.4 eV) and epi cadmic flow with energies greater than 0.4 eV, in the central thimble powers to the powers of 10, 100 W, 1, 10 100 Kw and 1 MW. The method used is known as flakes activation, which is to be arranged by placing flakes ( 3 mm of diameter and 0.0508 mm of thickness) of a given material (either Au, In, Cu, Mn, etc.) into an aluminum tube outside diameter equal to 6.35 mm, alternating flakes with lids covered and discovered of cadmium (3.4 mm of diameter and 0.508 mm of thickness) and separated by lucite pieces of 3 mm of diameter and 25.4 mm in length. After irradiating the flakes for some time, is measured the gamma activity of each of them, using a hyper pure germanium detector of high resolution. Already known gamma activity, proceed to calculate the epi cadmic and sub cadmic flows using a computer program in Fortran language, called Caflu. (Author)

  15. Determination of the stability of the uranyl ion sipped in {tau}-hydrogen phosphate of zirconium in sodic form; Determinacion de la estabilidad del ion uranilo sorbido en {tau}-hidrogenofosfato de zirconio en forma sodica

    Energy Technology Data Exchange (ETDEWEB)

    Ordonez R, E.; Fernandez V, S.M. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico); Drot, R.; Simoni, E. [Universite de Paris-Sud-XI, Institut de Physique Nucleaire d' Orsay, Groupe de radiochimie, Bat. 100, 91406 Orsay (France)]. e-mail: edo@nuclear.inin.mx

    2005-07-01

    The stability of the uranyl sipped in the zirconium {tau}-hydrogen phosphate in sodic form ({tau}-NaZrP), was carried out characterizing the complexes formed by Laser spectroscopy in the visible region and by X-ray photoelectron spectroscopy. The material was prepared by a new synthesis technique working in nitrogen atmosphere and to low temperatures. The sorption of the uranyl ion was made in acid media with concentrations of 10{sup -4} and 10{sup -5} of uranyl nitrate and with ion forces of 0.1 and 0.5 M of NaClO{sub 4}. The spectra of induced fluorescence with laser (TRLFS) show that the uranyl is fixed in very acid media in three well differentiated species, to pH less acid, the specie of long half life disappears and are only those of short half life. The results of the binding energy obtained by XPS indicate that the binding energy of the uranyl confer it a stable character to the complex formed in the {tau}-NaZP, that makes to this material appropriate to retain to the uranyl in solution to high ion forces and in acid media. (Author)

  16. Determination of Am-241 in lung and bone by gamma spectrometry with semiconductor detectors LEGe; Determinacion de Am- 241 en pulmon y hueso por espectrometria gamma con detectores de semiconductor LEGe

    Energy Technology Data Exchange (ETDEWEB)

    Perez Lopez, B.

    2014-07-01

    Americium is produced from neutron absorption plutonium atoms within nuclear reactors. The work of dismantling and decontamination of the installations and radioactive waste management makes workers exposed acquire risk of internal exposure and therefore can incorporate Am-241 in his body. (Author)

  17. Determination of Th and U by neutron activation for gamma spectrometry calibration in situ; Determinacion de Th y U por activacion neutronica para calibracion de espectrometria gamma in situ

    Energy Technology Data Exchange (ETDEWEB)

    Nava M, F.; Rios M, C.; Mireles G, F.; Saucedo A, S.; Davila R, I.; Pinedo, J. L. [Universidad Autonoma de Zacatecas, Unidad Academica de Estudios Nucleares, Cipres No. 10, Fracc. La Penuela, 98060 Zacatecas (Mexico); Landsberger, S., E-mail: iqnava@hotmail.com [University of Texas at Austin, Nuclear Engineering Teaching Laboratory, Pickle Research Campus, R9000 Austin, Texas 78712 (United States)

    2012-10-15

    Using the analysis by neutron activation to determine the profile of the thorium and uranium concentration calibration factors were obtained for their use in the gamma spectrometry in situ. Three sites were selected (San Ramon, Villa de Cos y la Zacatecana) and the analysis by activation was development in the Laboratory of Nuclear Engineering Teaching of the Texas University in Austin with the nuclear reactor Ut-TRIGA. Starting from the gamma spectra in situ, the areas of normalized photo-pick of the radioisotopes were: {sup 208}Tl and {sup 228}Ac for the thorium series and {sup 214}Pb and {sup 214}Bi for the uranium series. The averages of the factors found in units of (cpm/Bq/Kg) are of 105.63{+-}8.32 and 75.87{+-}4.61 for the thorium and uranium, respectively. (Author)

  18. Radioactive wastes repository in Temascalapa, State of Mexico, public opinion. Determination of health effects; Repositorio de residuos radiactivos en Temascalapa Estado de Mexico, Opinion publica. Determinacion de efectos en la salud

    Energy Technology Data Exchange (ETDEWEB)

    Solis Tinoco, E

    1998-12-31

    Nuclear waste usually concerns public about the impact on public health and the environment. In Mexico, such interest exists, particularly in the Temascalapa Municipality, Mexico where a low level waste repository recognized by the IAEA, has been functioning since 1972. Maquixco repository is located at 42 Kilometers northeast of Mexico City. Although the environmental radiological monitoring records have demonstrated negligible impact on the environment, in 1998 an unusual public polemic on radioactive health effects appeared among Temascalapa residents. This paper presents a research performed during 1998 with the participation of the National Nuclear Research Institute of Mexico and the National Autonomous University of Mexico. The research design allowed the involvement of local authorities, as a way of stimulate public participation. The research was performed in nine locations of the Temascalapa Municipality, it was focused on public polemics, associated to Maquixco repository as well as trying to identify demographic factors that exert influence on public attitudes. There are also presented the results of personal dosimetry analysis performed on a four hundred residents sample of this Municipality. (Author)

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

    Energy Technology Data Exchange (ETDEWEB)

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

    2014-10-15

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

  20. Analysis of a calculation method for the determination of the value of safety or control bars; Analisis de un metodo de calculo para la determinacion del valor de barras de seguridad o control

    Energy Technology Data Exchange (ETDEWEB)

    Aguilar H, F.; Torres A, C.; Filio L, C. [ININ, Gcia. de Reactores, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    1982-09-15

    Due to the control or safety bars in a nuclear reactor are constituted by strongly absorbent materials, the Diffusion Theory like tool for the calculation of bar values is not directly applicable, should it use the Transport Theory. However the speed and economy of the Diffusion codes for the reactors calculation, those make attractiveness and by this reason its are used in the determination of characteristic parameters and even in the determination of bar values, not without before to make some theoretical developments that allow to make applicable this theory. The application of the Diffusion Theory in strongly absorbent media is based on the use of some effective cross sections distinct from the real ones obtained when imposing the reason that among the flow and it gradient in the external surface of such media (control element in general, bar type or flagstone) be similar to the one obtained using Transport Theory in all the control region (multiplicative and absorbent media) with those real cross sections. The effective cross sections were obtained of the Leopard-NUMICE cell code which has incorporate the respective calculation theory of effective cross sections. Later these constants its were used in the bidimensional diffusion code Exterminator-II, simulating in it, the distribution of safety or control bars. From the cell code its were also obtained the respective constants of the homogeneous fuel cell. The results as soon as those obtained bar values of the diffusion code, its were compared with some experimental results obtained in the R{phi} Swedish reactor of natural uranium and heavy water. In this work an analysis of the bar value of one of them, trying to determine the applicability of the method is made. (Author)

  1. Determination of the physical parameters of the nuclear subcritical assembly Chicago 9000 of the IPN using the Serpent code; Determinacion de los parametros fisicos del conjunto subcritico nuclear Chicago 9000 del IPN usando el codigo SERPENT

    Energy Technology Data Exchange (ETDEWEB)

    Arriaga R, L.; Del Valle G, E. [IPN, Escuela Superior de Fisica y Matematicas, Av. Instituto Politecnico Nacional s/n, U.P. Adolfo Lopez Mateos, Col. San Pedro Zacatenco, 07738 Mexico D. F. (Mexico); Gomez T, A. M., E-mail: guten_tag_04@hotmail.com [ININ, Departamento de Sistemas Nucleares, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico)

    2013-10-15

    For the Serpent code was developed the three-dimensional model corresponding to the nuclear subcritical assembly (S A) Chicago 9000 of the Escuela Superior de Fisica y Matematicas del Instituto Politecnico Nacional (ESFM-IPN). The model includes: a) the core, formed by 312 aluminum pipes that contain 5 nuclear fuel rods (natural uranium in metallic form), b) the multi-perforated plates where they penetrate the inferior part of each pipe to be able to remain in vertical form, c) water, acting as moderator and reflector, and d) the recipient lodging to the core. The pipes arrangement is hexagonal although the transversal section of the recipient that lodges to the core is circular. The entrance file for the Serpent code was generated with the data provided by the manual of the S A use about the composition and density of the fuel rods and others obtained in direct form of the rods, as the interior and external diameter, mass and height. Of the obtained physical parameters, those more approached to that reported in the manual of the subcritical assembly are the effective multiplication factor and the reproduction factor η. The differences can be because the description of the fuel rods provided by the manual of the S A use do not correspond those that are physically in the S A core. This difference consists on the presence of a circular central channel of 1.245 diameter centimeters in each fuel rod. The fuel rods reported in the mentioned manual do not have that channel. Although the obtained results are encouraging, we want to continue improving the model to incorporate in this the detectors, defined this way by the Serpent code, which could determine the existent neutrons flux in diverse points of interest like the axial or radial aligned points and to compare these with those that are obtained in an experimental way when a generating neutrons source (Pu-Be) is introduced. Added to this effort the cross sections for each unitary cell will be determined, so that these are used in a transport code developed in the ESFM-IPN. (Author)

  2. Uranium Determination in Samples from Decommissioning of Nuclear facilities Related to the First Stage of Nuclear Fuel Cycle; Determinacion de Uranio en Muestras Procedentes del Desmantelamiento de Instalaciones de la Primera Parte del Cielo del Combustible Nuclear

    Energy Technology Data Exchange (ETDEWEB)

    Alvarez, A.; Correa, E.; Navarro, N.; Sancho, C. [Ciemat, Madrid (Spain); Angeles, A.

    2000-07-01

    An adequate workplace monitoring must be carried out during the decommissioning activities, to ensure the protection of workers involved in these tasks. In addition, a large amount of waste materials are generated during the decommissioning of nuclear facilities. Clearance levels are established by regulatory authorities and are normally quite low. The determination of those activity concentration levels become more difficult when it is necessary to quantify alpha emitters such as uranium, especially when complex matrices are involved. Several methods for uranium determination in samples obtained during the decommissioning of a facility related to the first stage of the nuclear fuel cycle are presented in this work. Measurements were carried out by laboratory techniques. In situ gamma spectrometry was also used to perform measurements on site. A comparison among the different techniques was also done by analysing the results obtained in some practical applications. (Author)

  3. Analysis by neutron activation in moss samples for the determination of Cr, Se, As and Hg; Analisis por activacion neutronica en muestras de musgos para la determinacion de Cr, Se, As y Hg

    Energy Technology Data Exchange (ETDEWEB)

    Mejia C, R.; Garcia R, G. [Instituto Tecnologico de Toluca, Departamento de Posgrado, Av. Tecnologico s/n, Fraccionamiento La Virgen, 52149 Metepec, Estado de Mexico (Mexico); Lopez R, C.; Avila P, P.; Longoria G, L. C., E-mail: rosario.mejia@inin.gob.mx [ININ, Departamento del Reactor, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico)

    2012-10-15

    This research work, presents a study of environmental monitoring in the Metropolitan Area of Toluca Valley using as bio-monitors to the mosses (bryophytes) native of different sites, analyzing the concentrations of As, Cr, Hg and Se, present in its structure. The analysis technique used to identify and to quantify to these elements was the Analysis by Neutron Activation, a nuclear analytic technique that allowed determining the concentrations at track level for its great versatility. Likewise the morphological study of the bryophyte Leskea angustata is presented by scanning electron microscopy. (Author)

  4. Uncertainty Evaluation and Influence of Gran Size to Determine PAHs in a Contaminated Soil; Influencia del Tamano de Particula de un Suelo Contaminado en las Incertidumbres Asociadas al Metodo de Determinacion de PAHs

    Energy Technology Data Exchange (ETDEWEB)

    Garcia Alonso, S.; Perez Pastor, R. M.; Escolano Segoviano, O.; Garcia Frutos, F. J.

    2007-07-20

    An evaluation of uncertainty associated to PAH determination in a contaminated soil is presented. The work was focused to measure the influence of grain size on concentration deviations and give a measure of result confidence of PAHs in the gasworks contaminated soil. This study was performed in the frame of the project 'Assessment of natural remediation technologies for PAHs in contaminated soils'(Spanish Plan Nacional I+D+i, CTM 2004-05832-CO2-01). This paper is presented as follows: A brief introduction which describes the main uncertainty contributions associated to chromatographic analysis. Afterwards, a statistic calculation was performed to measure each uncertainty component. Finally, a global uncertainty was calculated and the influence of grain size and distribution of compounds according to volatility was evaluated. (Author) 10 refs.

  5. EURADOS action for determination of americium in skull measures in vivo and Monte Carlo simulation; Accion EURADOS para la determinacion de americio en craneo mediante medidas in-vivo y simulacion Monte Carlo

    Energy Technology Data Exchange (ETDEWEB)

    Lopez Ponte, M. A.; Navarro Amaro, J. F.; Perez Lopez, B.; Navarro Bravo, T.; Nogueira, P.; Vrba, T.

    2013-07-01

    From the Group of WG7 internal dosimetry of the EURADOS Organization (European Radiation Dosimetry group, e.V.) which It coordinates CIEMAT, international action for the vivo measurement of americium has been conducted in three mannequins type skull with detectors of Germanium by gamma spectrometry and simulation by Monte Carlo methods. Such action has been raised as two separate exercises, with the participation of institutions in Europe, America and Asia. Other actions similar precede this vivo intercomparison of measurement and modeling Monte Carlo1. The preliminary results and associated findings are presented in this work. The laboratory of the body radioactivity (CRC) of service counter of dosimetry staff internal (DPI) of the CIEMAT, it has been one of the participants in vivo measures exercise. On the other hand part, the Group of numerical dosimetry of CIEMAT is participant of the Monte Carlo2 simulation exercise. (Author)

  6. Determination and Distribution of Critical Loads: Application to the Forest Soils in the Autonomous Region of Madrid; Determinacion y Distribucion de Cargas Criticas: Aplicacion a los Suelos forestales de la comunidad Autonoma de Madrid

    Energy Technology Data Exchange (ETDEWEB)

    Sousa, M.; Schmid, T.; Rabago, I. [Ciemat, Madrid (Spain)

    2000-07-01

    The critical loads of acidity and sulphur have been determined for forest soils within the north and north-west of the Autonomous Region of Madrid. The SMB-CCE and SMB-PROFILE Steady state models have been applied using a 1 km x 1 km resolution. the forest ecosystems have been characterised according to the soil and forest type, slope and climatic data using a Geographic Information System. In order to estimate the critical loads, processes such as weathering rate of the parent material, atmospheric deposition, critical alkalinity leaching rate and nutrients absorbed by the vegetation have been considered. In general the forest soils present high critical load values for acidity and sulphur. The more sensitive zones are found in the north of the Sierra of Guadarrama. Independent of the applied methods, the results are associated to the types of soils where Leptosols have the lowest. Cambisoles and Regosoles intermediate and luvisoles the most elevated values. (Author) 40 refs.

  7. Determination of nitrogen in wheat flour through Activation analysis using Fast neutron flux of a Thermal nuclear reactor; Determinacion de nitrogeno en harina de trigo mediante analisis por activacion empleando el flujo de neutrones rapidos de un reactor nuclear termico

    Energy Technology Data Exchange (ETDEWEB)

    Ramirez G, T

    1976-07-01

    In this work is done a technical study for determining Nitrogen (protein) and other elements in wheat flour Activation analysis, with Fast neutrons from a Thermal nuclear reactor. Initially it is given an introduction about the basic principles of the methods of analysis. Equipment used in Activation analysis and a brief description of the neutron source (Thermal nuclear reactor). The realized experiments for determining the flux form in the irradiation site, the half life of N-13 and the interferences due to the sample composition are included too. Finally, the obtained results by Activation and the Kjeldahl method are tabulated. (Author)

  8. Determination of low concentrations of pyridine in piperidine by gas chromatography and infrared spectroscopy; Determinacion de bajas concentraciones de piperidina en piridina por cromatografia de gases y espectroscopia infrarroja

    Energy Technology Data Exchange (ETDEWEB)

    Perez Garcia, M. M.; Parellada Bellod, R.

    1979-07-01

    This paper describes the determination of low amounts of piperidine in pyridine in the concentration range of 0-5%. After an exhausting review of the bibliography on the column selection, the chromatographic separation and determination are made on the following column: 27% Pennwalt- 223; 4% KOH on Gas-Chrom R; 80-100 mesh with flame ionization detector. The retention indexes of both compounds and tho Rohrschneider constants of the phase used are calculated. The minimum detection limit achieved for piperidine is 0,25%. (Author) 25 refs.

  9. Determination of the experimental setup suitable for the evaluation of two-dimensional distributions of doses using the Map check; Determinacion del montaje experimental idoneo para la evaluacion de distribuciones bidimensionales de dosis empleando el Mapcheck

    Energy Technology Data Exchange (ETDEWEB)

    Chinillach Ferrando, N.; Tortosa Oliver, R. A.; Lorente Franco, L.; Morales Marco, J. C.; Solar Catalan, P.; Andreu Martinez, F. J.

    2013-07-01

    During the process of commissioned and implementation of IMRT module we ask which would be the experimental set-up for the evaluation of the two-dimensional dose distributions using an array of detectors, taking into account the different possibilities offered by the materials available in the service, which allow as to provide three different configurations. The objective of the study is to determine which of the three offered us better results for checks of the two-dimensional distributions of dose in IMRT treatments, taking into account the workload involved in each method. (Author)

  10. Determination of times maximum insulation in case of internal flooding by pipe break; Determinacion de los tiempos maximos de aislamiento en caso de inundacion interna por rotura de tuberia

    Energy Technology Data Exchange (ETDEWEB)

    Varas, M. I.; Orteu, E.; Laserna, J. A.

    2014-07-01

    This paper demonstrates the process followed in the preparation of the Manual of floods of Cofrentes NPP to identify the allowed maximum time available to the central in the isolation of a moderate or high energy pipe break, until it affects security (1E) participating in the safe stop of Reactor or in pools of spent fuel cooling-related equipment , and to determine the recommended isolation mode from the point of view of the location of the break or rupture, of the location of the 1E equipment and human factors. (Author)

  11. Determination of conversion factors and efficiency for GM detectors used in measurements of surface pollution; Determinacion de factores de conversion y eficiencia para detectores GM empleados en medicion de contaminacion superficial

    Energy Technology Data Exchange (ETDEWEB)

    Ayala G, J.; Alvarez R, J.T. [Instituto Nacional de Investigaciones Nucleares, Laboratorio Secundario de Calibracion Dosimetrica, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    1999-07-01

    One of the objectives of the Radiation protection, is to observe with the National and as International standardization referring to the ICRP dose limitation system (ICRP 26, ICRP 60). In this work it was treated the problem corresponding about how to determine the conversion factor of cpm/mR/h and the absolute efficiency {epsilon}, for a Geiger-Muller equipment with thin window. This equipment is used for the beta particle detection. Thus the correct use of calibration factors and the procedures to convert cpm in Bq is expedited and also to apply the ISO procedure for to evaluate contaminated surfaces. (Author)

  12. Determination of the conversion coefficient for ambient dose equivalent, H(10), from air kerma measurements; Determinacion del coeficiente de conversion para la dosis equivalente ambiental, H*(10), a partir de mediciones de kerma en aire

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez J, F. [UNAM, Facultad de Ciencias, Circuito Exterior, Ciudad Universitaria, 04510 Ciudad de Mexico (Mexico); Alvarez R, J. T., E-mail: trinidad.alvarez@inin.gob.mx [ININ, Departamento de Metrologia de Radiaciones Ionizantes, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico)

    2015-09-15

    Namely the operational magnitudes can be determined by the product of a conversion coefficient by exposure air kerma or fluence, etc. In particular in Mexico for the first time is determined the conversion coefficient (Cc) for operational magnitude Environmental Dose Equivalent H(10) by thermoluminescence dosimetry (TLD) technique. First 30 TLD-100 dosimeters are calibrated in terms of air kerma, then these dosimeters are irradiated inside a sphere ICRU type of PMMA and with the aid of theory cavity the absorbed dose in PMMA is determined at a depth of 10 mm within the sphere D{sub PMMA}(10), subsequently absorbed dose to ICRU tissue is corrected and the dose equivalent H(10) is determined. The Cc is determined as the ratio of H(10)/K{sub a} obtaining a value of 1.20 Sv Gy{sup -1} with a u{sub c}= 3.66%, this being consistent with the published value in ISO-4037-3 of 1.20 Sv Gy{sup -1} with a u{sub c}= 2%. (Author)

  13. Determination of the neutron spectra in the treatment room of a linear accelerator for radiotherapy; Determinacion de los espectros de neutrones en la sala de tratamiento de un acelerador lineal para radioterapia

    Energy Technology Data Exchange (ETDEWEB)

    Vega C, H.R. [Universidad Autonoma de Zacatecas, Cuerpo Academico de Radiobiologia, A.P. 336, 98000 Zacatecas (Mexico); Barquero, R. [Hospital Universitario Rio Hortega, Valladolid (Spain); Mendez, R.; Iniguez, M.P. [Depto. de Fisica Teorica, Atomica, Molecular y Nuclear, Universidad de Valladolid, 47011 Valladolid (Spain)

    2003-07-01

    By means of a series of measures and Monte Carlo calculations the dosimetric characteristics of the photoneutrons have been determined that take place in volume to a linear accelerator of radiotherapy of 18 MV, LINAC, mark Siemens Mevatron model. The measures were carried out with thermoluminescent dosemeters TLD 600 and TLD 700 that were naked exposed and confined with cover of Cd and Sn, inside a sphere of paraffin and inside spheres Bonner. (Author)

  14. Determination of Cd and Pb in canned pineapple by atomic absorption spectroscopy using a graphite oven; Determinacion de Cd y Pb en pina enlatada por espectrometria de absorcion atomica utilizando horno de grafito

    Energy Technology Data Exchange (ETDEWEB)

    Linares P, G.; Sanchez P, L.; Benavides M, A.; Acosta L, C. [Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    1997-07-01

    Owing to the food susceptibility to be contaminated it is necessary to realize pursuit studies or frequent monitoring about the content of certain metals which represent health risks by its toxicological effects in the human being and another living organisms. In this work the cadmium and lead concentrations are determined in six national brands of canned pineapple analysing separately sugar sirup and the fruit. (Author)

  15. Determination of trace amounts of selenium in minerals and rocks by flame less atomic-absorption spectrometry; Determinacion de selinio en minerales y rocas por espectrometria de absorcion atomica

    Energy Technology Data Exchange (ETDEWEB)

    Alduan, F. A.; Capdevilla, C.

    1980-07-01

    The determination of trace amounts of selenium In silicate rocks and feldspar by solvent extraction and graphite furnace atomic-absorption spectrometry has been stu- died. Sodium diethyl-ditio carbamate and ammonium pyrrolidine dithiocarbamate have been tried as chelating agents. The best results are achieved when selenium is extracted Into carbon tetrachloride as the sodium diethyldithiocarbamate complex. The method allows to detect 0,75 ppm of selenium in the sample. Recoveries are about 100%. (Author) 7 refs.

  16. Determination of metallic impurities in raw materials for radioisotope production by atomic absorption spectroscopy; Determinacion de trazas metalicas en amterias primas para la produccion de radioisotopos por espectroscopia de absorcion atomica

    Energy Technology Data Exchange (ETDEWEB)

    Roca, M.; Alvarez, F.; Capdevila, C.

    1969-07-01

    Atomic absorption spectrometry has been used for the determination of traces of calcium in scandium oxide, copper in zinc, iron in cobalt oxide, manganese In ferric oxide, nickel in copper and zinc in gallium oxide. The influences on the sensitivities arising from the hollow cathode currents, the gas pressures and the acid concentrations have been considered. A study of the interferences from the metallic matrices has also been performed, the interference due to the absorption of the manganese radiation by the atoms of iron being the most outstanding . In order to remove the interfering elements and increase sensitivity, pre-concentration methods have been tested. The addition methods has also been used. (Author) 14 refs.

  17. Diferentes padronizações do teste da caminhada de seis minutos como método para mensuração da capacidade de exercício de idosos com e sem cardiopatia clinicamente evidente Different patterns for the 6-minute walk test as a test to measure exercise ability in elderly with and without clinically evident cardiopathy

    Directory of Open Access Journals (Sweden)

    Clênia Oliveira Araújo

    2006-03-01

    Full Text Available OBJETIVOS: Avaliar a correlação do consumo de oxigênio pico (VO2pico, no teste cardiopulmonar, com a distância percorrida no teste da caminhada de seis minutos (TC6 em idosos saudáveis e com infarto do miocárdio (IM. MÉTODOS: Avaliados 30 indivíduos, idade entre 65 e 87 anos (76,03 ± 4,75, divididos em 2 grupos: Grupo I - 14 com doença cardíaca clinicamente evidente (DCCE Grupo II - 16 sem DCCE. Foram submetidos ao teste cardiopulmonar (TCP e a 2 tipos de TC6. As variáveis mensuradas foram: a freqüência cardíaca (FC e respiratória (FR, pressão arterial (PA, distância percorrida (DP, e a percepção subjetiva de esforço de BORG. RESULTADOS: O estudo mostrou uma forte correlação das distâncias percorridas, em ambas as formas do (TC6, com o VO2pico obtido no TCP, em todos idosos incluídos neste estudo. Na comparação entre os TC6, quando aplicado com acompanhamento (TC6ac e sem acompanhamento (TC6s, foi observada diferença estatisticamente significante, com maiores valores médios da DP, da FC e FR, e da percepção subjetiva de esforço no TC6ac, em ambos os grupos. Além disso, a FC atingida ao final do esforço, no TC6ac, foi semelhante à obtida no TCP máximo (p OBJECTIVES: Evaluate the correlation between peak oxygen consumption (VO2peak, from cardiopulmonary test with the distance covered in the six-minute walk test (6MWT in healthy elderly and with myocardial infarction (MI. METHODS: Thirty individuals were studied, with age range 65 - 87 years (76, 03± 4,75, divided into 2 groups: Group I - 14 with clinically evident coronary heart disease (CHD and Group II - 16 without clinically evident CHD. They were submitted to cardiopulmonary test (CPT and 2 types of 6MWT, standard test 6MWTs. Variables measure at rest and exertion were heart rate (HR and respiratory rate (RR, blood pressure (BP, distance covered (DC, and Borg’s rate subjective perceived exertion (RPE. RESULTS: The study showed significant, strong correlation between distances covered for both 6MWT, and (VO2peak obtained from cardiopulmonary test (CPT for all elderly included in the study. When comparing the 6MWT with physiotherapist support (6MWTphy and without support (6MWTw, statistically significant difference was observed, with higher average values of the DC, of the RH and RR and Borg’s RPE in the 6MWTphy, both of the groups. Addtionally, the RH reached at final the exertion in 6MWTphy was similar to that obtained in CPT (p<0,05 suggesting that the 6MWT stimulates higher cardiovascular performance. CONCLUSION: 6MWTw, adopted a worldwide, by being submaximal imposes lower cardiovascular overburden as compared to 6MWTphy and is probably safer for elderly who are cardiopaths.

  18. Ecocardiografia-doppler e parâmetros hemodinâmicos em cardiopatias congênitas com hiperfluxo pulmonar Ecocardiografia-doppler y parámetros hemodinámicos en cardiopatías congénitas con hiperflujo pulmonar Doppler echocardiography and hemodynamic parameters in congenital heart disease with increased pulmonary flow

    Directory of Open Access Journals (Sweden)

    Zilma Verçosa de Sá Ribeiro

    2010-05-01

    Full Text Available FUNDAMENTO: A predição de dados de hemodinâmica pulmonar, a partir de avaliação não invasiva, poderia isentar alguns portadores de defeitos septais cardíacos congênitos da avaliação invasiva pré-operatória (cateterismo. OBJETIVO: Verificar, em avaliação simultânea, se dados obtidos pela ecocardiografia-Doppler poderiam predizer aspectos da condição hemodinâmica pulmonar em tais pacientes. MÉTODOS: Parâmetros ecocardiográficos relacionados ao fluxo sistólico pulmonar e sistêmico e ao fluxo em veia pulmonar foram relacionados a dados hemodinâmicos em 30 pacientes consecutivos com defeitos septais cardíacos (idade entre 4 meses e 58 anos, mediana 2,2 anos; pressão arterial pulmonar média entre 16 e 93 mmHg. RESULTADOS: As variáveis integral velocidade-tempo do fluxo sistólico em via de saída de ventrículo direito (VTI VSVD > 22 cm e do fluxo em veia pulmonar (VTI VP > 20 cm foram preditivos de níveis RVP/RVS 27 cm e VTI VP > 24 cm, a especificidade foi superior a 0,90 e a razão de chances 2,29 e 4,47 respectivamente. A razão entre os fluxos pulmonar e sistêmico (Qp/Qs > 2,89 e > 4,0, estimativas ecocardiográficas foi útil na predição de valores Qp/Qs > 3,0 pelo cateterismo (especificidade de 0,78 e 0,91, razão de chances 1,14 e 2,97, respectivamente. CONCLUSÃO: Em portadores de defeitos septais cardíacos, a ecocardiografia-Doppler é capaz de identificar aqueles em situação de aumento de fluxo e baixos níveis de resistência vascular pulmonar.FUNDAMENTO: La predicción de datos de la hemodinamia pulmonar, a partir de la evaluación no invasiva, podría eximir a algunos portadores de defectos septales cardíacos congénitos de la evaluación invasiva preoperatoria (cateterismo. OBJETIVO: Verificar, en evaluación simultánea, si los datos obtenidos mediante ecocardiografía-Doppler podrían predecir aspectos de la condición hemodinámica pulmonar en esos pacientes. MÉTODOS: Parámetros ecocardiográficos relacionados al flujo sistólico pulmonar y sistémico y al flujo en la vena pulmonar fueron relacionados a datos hemodinámicos en 30 pacientes consecutivos con defectos septales cardíacos (edad entre 4 meses y 58 años, mediana 2,2 años; presión arterial pulmonar media entre 16 y 93 mmHg. RESULTADOS: Las variables integral velocidad-tiempo del flujo sistólico en la vía de salida del ventrículo derecho (VTIVSVD > 22 cm y del flujo en la vena pulmonar (VTIVP > 20 cm fueron predictivas de niveles RVP/RVS 27 cm y VTIVP > 24 cm, la especificidad fue superior a 0,90 y la razón de chances 2,29 y 4,47 respectivamente. La razón entre los flujos pulmonar y sistémico (Qp/Qs > 2,89 y > 4,0, estimaciones ecocardiográficas fue útil para la predicción de valores Qp/Qs > 3,0 por cateterismo (especificidad de 0,78 y 0,91, razón de chances 1,14 y 2,97, respectivamente. CONCLUSIÓN: En portadores de defectos septales cardíacos, la ecocardiografía-Doppler es capaz de identificar aquellos en situación de aumento de flujo y bajos niveles de resistencia vascular pulmonar.BACKGROUND: The prediction of pulmonary hemodynamic data from non-invasive assessment could exempt some patients with congenital cardiac septal defects from preoperative invasive assessment (catheterization. OBJECTIVE: To determine, in simultaneous assessment, whether data obtained from Doppler echocardiography could predict aspects of pulmonary hemodynamics in such patients. METHODS: Echocardiographic parameters related to systolic and systemic pulmonary flow and pulmonary venous flow were related to hemodynamic data in 30 consecutive patients with cardiac septal defects (aged 4 months to 58 years, median 2.2 years, mean pulmonary artery pressure between 16 and 93 mmHg. RESULTS: The velocity-time integrals of systolic flow in right ventricle outflow tract (VTI RVOT > 22 cm and pulmonary venous flow (VTI VP > 20 cm predicted PVR/SVR 27 cm and VTI PV > 24 cm values, the specificity was higher than 0.90 and odds ratio 2.29 and 4.47 respectively. The ratio between pulmonary and systemic flows (Qp/Qs > 2.89 and > 4.0, echocardiographic estimates was useful in predicting Qp/Qs > 3.0 values through catheterization (specificity of 0.78 and 0.91, odds ratio 1.14 and 2.97, respectively. CONCLUSION: In patients with cardiac septal defects, Doppler echocardiography is able to identify those at increased flow and low pulmonary vascular resistance.

  19. Polimorfismo K121Q do gene ENPP1 e cardiopatia isquêmica em pacientes com diabete melito Polimorfismo K121Q del gen ENPP1 y cardiopatía isquémica en pacientes con diabetes melitus ENPP1 K121Q polymorphism and ischemic heart disease in diabetic patients

    Directory of Open Access Journals (Sweden)

    Milene Moehlecke

    2010-02-01

    Full Text Available FUNDAMENTO: O gene ecto-nucleotídeo pirofosfatase/fosfodiesterase 1 (ENPP1 é um gene candidato à resistência insulínica. A resistência à insulina é um componente importante da síndrome metabólica e tem sido implicada no desenvolvimento de doença cardíaca isquêmica (DCI. OBJETIVO: Avaliar a associação entre o polimorfismo K121Q do gene ENPP1 e a presença da DCI em pacientes caucasianos com diabete melito (DM tipo 2. MÉTODOS: Estudo transversal foi realizado em pacientes com DM tipo 2 (n=573; 50,6% homens; idade 59,5±10,4 anos. DCI foi definida pela presença de angina ou infarto agudo do miocárdio pelo questionário cardiovascular da Organização Mundial da Saúde e/ou alterações compatíveis no ECG (código Minnesota ou cintilografia miocárdica. O polimorfismo K121Q foi genotipado através da técnica de PCR e digestão enzimática. RESULTADOS: DCI esteve presente em 209 (36,5% pacientes. A frequência dos genótipos KK, KQ e QQ entre os pacientes com DCI foi 60,8%, 34,4% e 4,8%, semelhante à distribuição dos genótipos entre os pacientes sem DCI (64,0%, 32,7% e 3,3%, P = 0,574. Não se observou diferença nas características clínicas ou laboratoriais entre os três genótipos, nem em relação à presença de síndrome metabólica. CONCLUSÃO: Nenhuma associação foi encontrada entre o polimorfismo K121A do gene ENPP1 e a presença de DCI ou características fenotípicas de resistência insulínica.FUNDAMENTO: El gen ecto-nucleótido pirofosfatasa/fosfodiesterasa 1 (ENPP1 es un gen candidato a la resistencia insulínica. La resistencia a la insulina es un componente importante del síndrome metabólico y ha sido involucrada en el desarrollo de enfermedad cardiaca isquémica (ECI. OBJETIVO: Evaluar la asociación entre el polimorfismo K121Q del gen ENPP1 y la presencia de ECI en pacientes caucásicos con diabetes melitus (DM tipo 2. MÉTODOS: SE Realizó un estudio transversal en pacientes con DM tipo 2 (n=573; 50,6% hombres; edad 59,5±10,4 años. Se definió la ECI por la presencia de angina o infarto agudo de miocardio mediante el cuestionario cardiovascular de la Organización Mundial de la Salud y/o alteraciones compatibles en el ECG (código Minnesota o centellograma miocárdico. El polimorfismo K121Q fue genotipificado mediante la técnica de PCR y digestión enzimática. RESULTADOS: La ECI estuvo presente en 209 (36,5% pacientes. La frecuencia de los genotipos KK, KQ y QQ entrel os pacientes con ECI fue del 60,8%, 34,4% y 4,8%, semejante a la distribución de los genotipos entre los pacientes sin ECI (64,0%, 32,7% y 3,3%, P = 0,574. No se observó diferencia en las características clínicas o de laboratorio entre los tres genotipos, ni en relación con la presencia de síndrome metabólico. CONCLUSIÓN: No se encontró ninguna asociación entre el polimorfismo K121A del gen ENPP1 y la presencia de ECI o características fenotípicas de resistencia insulínica.BACKGROUND: The ecto-nucleotide pyrophosphatase/phosphodiesterase 1 (ENPP1 gene is a candidate gene for insulin resistance. Insulin resistance is a major component of metabolic syndrome (MetS and has been implicated in ischemic heart disease (IHD. OBJECTIVE: To evaluate the association between the K121Q polymorphism of the ENPP1 gene and IHD in white patients with type 2 diabetes mellitus (DM. METHODS: A cross-sectional study was performed in type 2 DM patients (n = 573, 50.6% males, age 59.5±10.4 years. IHD was defined by the presence of angina or myocardial infarction according to the Worth Health Organization cardiovascular questionnaire and/or compatible electrocardiographic (Minnesota Code, or perfusional abnormalities in myocardial scintigraphy. The K121Q polymorphism of ENPP1 gene was genotyped using PCR-based methods and restriction enzyme digestion. RESULTS: IHD was present in 209 (36.5% patients. The distribution of KK, KQ and QQ genotypes among patients with IHD was 60.8%, 34.4% and 4.8%, not different from the genotype distribution in the group without IHD (64%, 32.7% and 3.3%, P=0.574. No difference was found in the clinical and laboratory characteristics between the three genotypes, neither regarding the prevalence of Metabolic Syndrome. CONCLUSION: No association was found between polymorphism K121A of ENPP1 gene and the presence of IHD.

  20. Eventos catastróficos associados ao tratamento da comunicação interatrial tipo ostium secundum: razões para não se subestimar este tipo de cardiopatia congênita Catastrophic events associated to the surgical treatment of ostium secundum atrial septal defects: reasons for not underestimating this type of congenital cardiopathy

    Directory of Open Access Journals (Sweden)

    Paulo Roberto B. Evora

    2004-12-01

    Full Text Available OBJETIVO: O presente trabalho clínico foi motivado pela frustrante experiência de quatro pacientes operados para o tratamento cirúrgico da comunicação interatrial tipo ostium secundum (CIA-II, que vieram a falecer em condições extremamente dramáticas. MÉTODO: Estudo retrospectivo embasado em dados de prontuários. As pesquisas bibliográficas incluíram: tromboembolismo paradoxal (cerebral, pulmonar ou mesentérico, malformações vasculares do sistema nervoso central e conexões anômalas das veias cavas. Estas pesquisas da literatura foram embasadas em possíveis eventos, inesperados e catastróficos, que levaram quatro pacientes ao óbito. RESULTADOS: Os quatros pacientes, todos do sexo feminino, foram submetidos a atriosseptorrafia com tempo de parada cardíaca isquêmica inferior a 20 minutos, em circulação extracorpórea. As causas de óbito foram: isquemia intestinal não-oclusiva, ruptura de aneurisma cerebral de artéria comunicante anterior, cor pulmonale com hipertensão arterial e tromboembolismo e um provável tromboembolismo cerebral em uma criança que precisou ser reoperada pela drenagem da veia cava inferior em átrio esquerdo. CONCLUSÃO: A lição final deste trabalho é: "Não subestime a comunicação interatrial em cirurgia cardíaca!".OBJECTIVE: The present article was motivated by the frustrating experiences with four patients who underwent surgical treatment of ostium secundum atrial septal defect (ASD-II and who died in extremely dramatic circumstances. METHOD: This is a retrospective study based on clinical data. The bibliographical researche included: paradoxical thromboembolism (cerebral, lung or mesenteric, central nervous system vascular malformations and anomalous vena cava connections. This research was based on possible events, unexpected and catastrophic, that could have directly caused the patients' deaths. RESULTS: All patients were female, the operations were performed under cardiopulmonary bypasses with less than 20 minutes of aortic cross-clamping. The causes of death were: non-occlusive intestinal ischemia, rupture of a cerebral aneurysm of the anterior communicating artery, cor pulmonale associated with pulmonary arterial hypertension and thromboembolism and probable cerebral thromboembolism in a child that needed to be reoperated to correct anomalous inferior vena cava drainage into the left atrium. CONCLUSION: Even being technically easy to treat, death due to atrial septal defects in extremely dramatic circumstances is possible, so "Do not underestimate the atrial septal in congenital heart surgery".

  1. Caso 4/2003 - Paciente de 61 anos, portadora de cardiopatia da doença de Chagas, com disfunção ventricular, taquicardia ventricular recorrente e marcapasso cardíaco, que apresentou morte em assistolia após ressecção cirúrgica de aneurisma de ponta

    Directory of Open Access Journals (Sweden)

    Franco Fábio Gazelato

    2003-01-01

    Full Text Available A 61 year-old Chagasic woman, with previous left ventricular systolic disfunction, ventricular tachychardia and cardiac pacemaker, presented cardiac arrest in asystolia after surgical ressection of apical aneurysm.

  2. Estudio sobre la influencia de la dieta y la actividad física en el perfil lipídico de sujetos vegetarianos

    OpenAIRE

    Delgado Fernández, Manuel

    2013-01-01

    La dieta lactovegetariana se presenta como más favorable para prevenir el riesgo de cardiopatía isquemica en relación a la dieta omnívora y ovolactovegetariana, para sujetos sedentarios sanos de ambos sexos. El cambio a dieta ovolactovegetariana desde dieta omnívora origina disminución de los valores de colesterol total y hdl-colesterol, sin variaciones en el perfil cineantropometrico y capacidad aeróbica. Los sujetos vegetarianos consumen menos grasa saturada y colesterol en relación a sujet...

  3. Estudio sobre la influencia de la dieta y la actividad f??sica en el perfil lip??dico de sujetos vegetarianos

    OpenAIRE

    Delgado Fern??ndez, Manuel

    1992-01-01

    La dieta lactovegetariana se presenta como m??s favorable para prevenir el riesgo de cardiopat??a isquemica en relaci??n a la dieta omn??vora y ovolactovegetariana, para sujetos sedentarios sanos de ambos sexos. El cambio a dieta ovolactovegetariana desde dieta omn??vora origina disminuci??n de los valores de colesterol total y hdl-colesterol, sin variaciones en el perfil cineantropometrico y capacidad aer??bica. Los sujetos vegetarianos consumen menos grasa saturada y colesterol en relaci??n...

  4. [Gelastic seizures as the presenting symptom of infarction of the cingulate gyrus].

    Science.gov (United States)

    Egea-Lucas, I; Martinez-Mondejar, E; Piqueres-Vidal, C F; Frutos-Alegria, M T

    2015-09-01

    Introduccion. Las crisis gelasticas son crisis epilepticas poco frecuentes en las que la risa inapropiada es la manifestacion principal. Su etiologia es diversa. No hemos encontrado en la bibliografia ningun caso de risa patologica claramente epileptica relacionada con ictus, aunque hay multiples descripciones de risa patologica no epileptica como sintoma prodromico en pacientes con ictus (fou rire prodromique). Presentamos un caso de infarto del giro cingulado que curso con crisis gelasticas al inicio y durante la evolucion del proceso clinico. Caso clinico. Mujer de 81 años, que bruscamente presento episodios de dificultad para la expresion verbal con desconexion del medio, acompañados de accesos de risa inmotivada e incontrolable de duracion inferior a cinco minutos. Tras los episodios, tenia bajo nivel de consciencia. Coincidiendo con alguno de ellos, se observaron tambien movimientos involuntarios de los miembros superiores. La resonancia desvelo la existencia de una lesion isquemica aguda del territorio del giro cingulado izquierdo y el electroencefalograma puso de manifiesto la existencia de actividad epileptogena frontal y temporal anterior izquierda. Conclusiones. El perfil clinico, los resultados de las exploraciones complementarias y la respuesta al tratamiento antiepileptico permiten afirmar que los episodios descritos en esta paciente corresponden a crisis gelasticas relacionadas con una lesion isquemica aguda del giro cingulado izquierdo.

  5. Anestesia para correção de tetralogia de Fallot em paciente adulto: relato de caso

    OpenAIRE

    Lorentz,Michelle Nacur; Gontijo Filho,Bayard

    2007-01-01

    JUSTIFICATIVA E OBJETIVOS: A cardiopatia congênita é um dos problemas mais comuns ao nascimento acometendo 1 a 1,5 em cada 10.000 nascidos vivos. Atualmente mais de 85% das crianças com cardiopatias congênitas chegam à idade adulta em parte devido aos novos tratamentos, mas sobretudo em virtude da tendência de se realizarem correções cirúrgicas mais precoces. Por outro lado, é raro encontrar um adulto com tetralogia de Fallot (T4F) não-corrigida. O objetivo do presente relato foi descrever um...

  6. Avaliação comparativa dos efeitos do anlodipino e da pimobendana na insuficiência valvar crônica de mitral em cães

    OpenAIRE

    Orson Nobumitsu Kamakura

    2016-01-01

    A insuficiência valvar crônica de mitral (IVCM) é a principal cardiopatia de cães, correspondendo a 75-85% dos casos de cardiopatias. É causada pela degeneração mixomatosa da valva mitral (endocardiose de mitral) sendo, então, uma doença degenerativa adquirida e que pode ocasionar a insuficiência cardíaca congestiva (ICC). Pode acometer qualquer raça de cão, mas é mais frequentemente observada nas raças de pequeno porte, dentre as quais, Poodle miniatura, Spitz Alemão, Dachshund, Yorkshire Te...

  7. Alterações do pericárdio na fase crônica da tripanossomíase cruzi humana e nas fases aguda e crônica da moléstia experimental

    Directory of Open Access Journals (Sweden)

    P. Raso

    1971-06-01

    Full Text Available Os Autores estudam as alterações do pericárdio, especialmente do pericárdio visceral na cardiopatia chagásica, confrontando-se com as alterações, observadas em outras cardiopatias (reumáticas e hipertensivas. Analisam as alterações pericárdicas no camundongo experimentalmente infectado e discutem especialmente a natureza e a gênese das lesões, a evolução e a correlação dos vários aspectos morfológicos entre si.

  8. Miocárdio não compactado, Doença de Chagas e disfunção: relato de caso

    OpenAIRE

    Mello,Ronaldo Peixoto de; Szarf,Gilberto; Nakano,Edson; Dietrich, Cristiano; Cirenza,Claudio; Angelo A. V. de Paola

    2010-01-01

    Relatamos a associação entre a cardiopatia associada ao miocárdio não compactado do ventrículo esquerdo (MNCVE) à cardiopatia chagásica crônica (CCC) em paciente com clínica de insuficiência cardíaca, acidente vascular cerebral isquêmico e arritmia cardíaca. As imagens típicas de MNCVE e CCC foram documentadas pela ressonância magnética cardíaca (RMC).

  9. Cirurgia valvar mitral e da comunicação interatrial: abordagem minimamente invasiva ou por esternotomia

    OpenAIRE

    Castro Neto,Josué V.; Emanuel Melo; Juliana Fernandes; Regina Gomes; Caroline Freitas; João Machado; Francisco Martins; Aloísio Barbosa; Bernardo Oliveira; Cesar Gondim

    2012-01-01

    FUNDAMENTO: Para diminuir o trauma cirúrgico em procedimentos cardiovasculares, técnicas Minimamente Invasivas (MI) foram alternativamente introduzidas. OBJETIVO: Comparar o acesso cirúrgico MI com a Esternotomia Mediana (EM) para tratar a cardiopatia valvar mitral (VM) e a Comunicação Interatrial (CIA). MÉTODOS: Estudo prospectivo onde quarenta pacientes foram submetidos a cirurgia para correção de cardiopatia VM ou CIA. Foram divididos em: grupo A (GA) (n = 20), de acesso por minitoracotomi...

  10. Cirurgia valvar mitral e da comunicação interatrial: abordagem minimamente invasiva ou por esternotomia Mitral valve and atrial septal defect surgery: minimally invasive or sternotomy approach

    OpenAIRE

    Castro Neto,Josué V.; Emanuel Melo; Juliana Fernandes; Regina Gomes; Caroline Freitas; João Machado; Francisco Martins; Aloísio Barbosa; Bernardo Oliveira; Cesar Gondim

    2012-01-01

    FUNDAMENTO: Para diminuir o trauma cirúrgico em procedimentos cardiovasculares, técnicas Minimamente Invasivas (MI) foram alternativamente introduzidas. OBJETIVO: Comparar o acesso cirúrgico MI com a Esternotomia Mediana (EM) para tratar a cardiopatia valvar mitral (VM) e a Comunicação Interatrial (CIA). MÉTODOS: Estudo prospectivo onde quarenta pacientes foram submetidos a cirurgia para correção de cardiopatia VM ou CIA. Foram divididos em: grupo A (GA) (n = 20), de acesso por minitoracotomi...

  11. Calculus of radiolytic products generation in water due to alpha radiation. Determination of the spent nuclear fuels matrix alteration rate Determination of velocity of spent fuel matrix; Calculo de la generacion de productos radioliticos en agua por radiacion {alpha}. Determinacion de la velocidad de alteracion de la matriz del combustible nuclear gastado

    Energy Technology Data Exchange (ETDEWEB)

    Quinones, J.; Serrano, J.; Diaz Arocas, P.; Rodriguez Almazan, J. L. [Ciemat. Madrid (Spain); Bruno, J.; Cera, E.; Merino, J.; Esteban, J. A.; Martinez-Esparza, A. [Enresa. Madrid (Spain)

    2000-07-01

    The generation of radiolytic products as a result of alpha radiation in the surface of the spent fuel is a key process in order to understand how the it becomes degraded in repository conditions. The present work has established a radiolytic model based on a set of reactions involving fuel oxidation-dissolution and radiolytic products recombination. It also includes the decrease of the dose rates as the main alpha emitters decay away. Four cases, with varying parameters of the system, have been assessed. The results show a decrease in both the concentration of the radiolytic products in the gap water and the degradation of the fuel matrix. It has been estimated that in the period of the evaluation (10''6 years) up to 52% of the pellet is altered in the conservative cases, whereas only 11% is altered in the realistic cases. No significant differences were observed when the carbonates reactions were included in the system. (Author)

  12. The biological degradation as an energy option, determination of the effects of the aerobic phase on the subsequent production of biogas in a sanitary landfill; La degradacion biologica como una opcion energetica, determinacion de los efectos de la fase aerobia sobre la subsecuente produccion de biogas en un relleno sanitario

    Energy Technology Data Exchange (ETDEWEB)

    Aguilar Juarez, Oscar [Asesoria de Servicios Ambientales del Bajio (ASSB), (Mexico)

    2010-07-01

    The present work deals with the energy evaluation of biological processes as energy source and is based on works concerning laboratory, pilot and field research. The objective of the research is to integrate the effect of the aerobic phase during the process of degradation of organic residues (basically the organic fraction of domestic residues), where the last aim is the biogas production. The usefulness of the results is reflected in the suitable estimation of the filling of a sanitary landfill considering the composition of the residues deposited and the effects that this management will have on the run-up time of the same and the velocity of biogas production. Finally, integrates a reflection on the intrinsic energy implications of the process and of the biogas yielding, which is evaluated as well as energy source. [Spanish] El presente trabajo trata sobre la valoracion energetica de procesos biologicos como fuente de energia y se basa en trabajos de investigacion a nivel de laboratorio, piloto y de campo. El objetivo de la investigacion es integrar el efecto de la fase aerobia durante el proceso de degradacion de residuos organicos (basicamente la fraccion organica de residuos domesticos), donde el fin ultimo es la produccion de biogas. La utilidad de los resultados se refleja en la estimacion adecuada del llenado de un relleno sanitario considerando la composicion de los residuos ahi depositados y los efectos que tendra esta gestion sobre el tiempo de estabilizacion de los mismos y la velocidad de produccion de biogas. Finalmente, se integra una reflexion sobre las implicaciones energeticas intrinsecas al proceso y del rendimiento de biogas, el cual a su vez es valorizado como fuente de energia.

  13. Determination of lutetium (III) hydrolysis constants in the middle of ion force 1M sodium chloride at 303 K; Determinacion de las constantes de hidrolisis del lutecio (III), en medio de fuerza ionica 1M de cloruro de sodio, a 303 K

    Energy Technology Data Exchange (ETDEWEB)

    Jimenez R, M.; Solache R, M.J. [Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico); Ramirez G, J.J.; Rojas H, A. [Universidad Autonoma Metropolitana-Iztapalapa, Mexico D.F. (Mexico). Dept. de Quimica

    1997-07-01

    With the purpose to complete information about the lutetium (III) hydrolysis constants here is used the potentiometric method to determine those in the middle of ion force 1M sodium chloride at 303 K. (Author)

  14. Development of an analytical model for the determination of {sup 60}Co in aqueous samples by atomic absorption and gamma spectrometry techniques; Elaboracion de un modelo analitico para la determinacion de {sup 60}Co en muestras acuosas mediante tecnicas de absorcion atomica y espectrometria gamma

    Energy Technology Data Exchange (ETDEWEB)

    Solis A, N. A.

    2015-07-01

    The applications of the nuclear energy in industry and medicine generate radioactive wastes that must be isolated and confined in order to limit its spread in the biosphere. These types of wastes are generated in hospitals, industry, research centers and nuclear power plants (during de fuel cycle). The radioactive elements (radionuclides) cannot be destroyed by any known method, either chemical or mechanical. Its final destruction is produced by radioactive decay, which makes them stable isotopes, or nuclear transmutation being bombarded with atomic particles. Consequently, the radioactive waste management is to control the radioactive discharges and reduce to tolerable limits, eliminating of effluents and wastes the radionuclides of interest, concentrating them so they can be stored or evacuated so that later not appear in dangerous concentration in the biosphere. In Mexico, the main generators of radioactive wastes are the nuclear power plant of Laguna Verde in Veracruz, Hospitals of the public and private sector, in addition Instituto Nacional de Investigaciones Nucleares (ININ) some institutes and facilities of the UNAM and Instituto Politecnico Nacional (IPN) and industries among others. The aqueous radioactive wastes, particularly those from the nuclear power plants contain traces of cobalt-60. Currently there is no model or analytical technique for the separation of this radionuclide, so it became necessary to develop an analytical model for separation and facilitate their disposal. In this paper was shown that atomic absorption and gamma spectrometry techniques can separate the active concentration of the inactive, which is important because the total concentration can be associated through direct relationships with the wear of metal parts of the nuclear reactor, since the metal alloys of the same reactor containing a fraction of cobalt. Also this analytical and mathematical model that can be reproducible and applicable to full sets of samples and that this correlation can be interpreted graphically to obtain approximate values for active or inactive cobalt concentration. (Author)

  15. Determination of the extractive capacity of para-tert butyl calix[8]arene octa-phosphinoylated towards uranyl ions from an aqueous-acidic-salty medium; Determinacion de la capacidad extractiva del p-ter-butilocalix[8]areno octa-fosfinoilado hacia iones uranilo de un medio acuo-acido salino

    Energy Technology Data Exchange (ETDEWEB)

    Serrano V, E. C.

    2011-07-01

    The extraction properties of octa-phosphinoylated para-tert butyl calix[8]arene (prepared in the laboratory) in chloroform towards uranyl ions from an aqueous-acidic-salty medium (HNO{sub 3}-3.5 NaNO{sub 3}) containing uranyl nitrate salt, was investigated. Two spectroscopic techniques UV/Vis and Luminescence were used for this study. The latter permitted analyze the fluorescence from the uranyl ions influenced by the surrounding medium. Both permitted to learn about the power of this calixarene as extractant towards the mentioned ions. Its extraction ability or capability using this calixarene at 5.91 x 10{sup -4} M towards the uranyl ions was 400% as determined by UV/Vis while fluorescence revealed 100% of uranyl ion extraction. A closed analysis of the results obtained by using these techniques revealed that the stoichiometry of the main extracted species was 1calixarene:2 uranyl ions. The loading capacity of the calixarene ligand towards the uranyl ions was also investigated using both techniques. UV/Vis resulted to be inadequate for quantifying exactly the loading capacity of the calixarene whereas luminescence was excellent indeed, using a 5.91 x 10{sup -4} M calixarene concentration, its loading capacity was 0.157 M of free uranyl ions from 0.161 M of uranyl ions present in the aqueous-acidic-salty medium. The extracts from the ability and capacity studies were concentrated to dryness, purified and the dried extracts were analyzed by infrared and neutron activation analysis. By these techniques it was demonstrated that during the extraction of the uranyl ions by the calixarene ligand they form thermodynamically and kinetically stable complexes, since in the solid state, the 1:2, calixarene; uranyl ions stoichiometry was kept with the minimum formula: (UO{sub 2}){sub 2}B{sub 8}bL{sup 8}(NO{sub 3}){sub 4}(H{sub 2}O){sub 4}CHCl{sub 3}(CH{sub 3}OH){sub 3} the methanol molecules come from its purification. It is proposed that B{sub 8}bL{sup 8} calixarene in chloroform medium is a good extractant for the treatment of nuclear wastes or radioactive wastes containing uranium in a rich aqueous-acidic-salty medium. (Author)

  16. Optimized Analytical Method to Determine Gallic and Picric Acids in Pyrotechnic Samples by Using HPLC/UV (Reverse Phase); Optimizacion del Metodo Analitico mediante HPLC/UV Operando en Fase Inversa para la Determinacion de Acido Galico y Acido Picrico en Muestras de Origen Pirotecnico

    Energy Technology Data Exchange (ETDEWEB)

    Garcia Alonso, S.; Perez Pastor, R. M.

    2013-10-01

    A study on the optimization and development of a chromatographic method for the determination of gallic and picric acids in pyrotechnic samples is presented. In order to achieve this, both analytical conditions by HPLC with diode detection and extraction step of a selected sample were studied. (Author)

  17. Analytical Procedure Development to Determine Polycyclic Aromatic Compounds in the PM{sub 2}.5-PM{sub 1}0 Fraction of Atmospheric Aerosols; Desarrollo de una Metodologia Analitica para la Determinacion de Compuestos Aromaticos Policiclicos en las Fracciones PM{sub 2}.5-PM{sub 1}0 del Aerosol Atmosferico

    Energy Technology Data Exchange (ETDEWEB)

    Barrado, A. I.; Garcia, S.; Perez, R. M.

    2013-06-01

    This paper presents an optimized and validated analytical methodology for the determination of various polycyclic aromatic compounds in ambient air using liquid chromatography with fluorescence detection. This analysis method was applied to samples obtained during more than one year in an area of Madrid. Selected compounds have included thirteen polycyclic hydrocarbons considered priorities by the EPA, and hydroxylated derivatives, which have been less investigated in air samples by liquid chromatography with fluorescence detection. We have characterized and compared the concentration ranges of compounds identified and studied seasonal and monthly variations. In addition, the techniques have been applied to study multivariate correlations, factor analysis and cluster analysis to extract as much information as possible for interpretation and more complete and accurate characterization of the results and their relationship with meteorological parameters and physicochemical. (Author) 50 refs.

  18. Optimization of methodology by X-ray fluorescence for the metals determination in aquatic plants of the high course of the Lerma river; Optimizacion de la metodologia por fluorescencia de rayos X para la determinacion de metales en plantas acuaticas del curso alto del Rio Lerma

    Energy Technology Data Exchange (ETDEWEB)

    Albino P, E.

    2015-07-01

    The high course of the Lerma river has a pollution problem in its hydrological system due to discharges of urban wastewater and industrial areas; the pollutants that affect the hydrological system are metals, which are absorbed by living organisms and probably incorporated into the food chain. For this reason in this work the technique of X-ray fluorescence total reflection was applied in six species of aquatic plants that grow in the high course of the Lerma river: Arroyo Mezapa (Eichhornia crassipes, Juncus efusus, Hydrocotyle, Schoenoplectus validus) Ameyalco river (Lemna gibba) and Atarasquillo river (Berula erecta) in order to evaluate the metals concentration (Cr, Mn, Fe, Ni, Cu, Zn and Pb) as well as the translocation factor and bioaccumulation factor for each aquatic species. According to the results, was observed that the highest concentration of metals is located in the deeper parts; metals which present a significant concentration are Mn and Fe in the six species of aquatic plants. According to the translocation factor the species having a higher translocation of metals are: Juncus efusus in Mn (1.19 mg/L) and Zn (1.31 mg/L), Hydrocotyle (1.14 mg/L), the species Eichhornia crassipes not show translocation. For bioaccumulation factor, was observed that the most bioaccumulation of metals is found in the soluble fraction of the six species of aquatic plants, especially Fe followed of Cu and Zn. Also was considered that the Berula erecta plant had a higher bioaccumulation of metals such as Cr, Mn, Fe, Cu and Zn so it can be considered as a hyper-accumulating species of these elements. With the results can be considered that the technique of X-ray fluorescence total reflection is 95% reliable to determine the concentration of metals within the structures of the aquatic plants used for this study. (Author)

  19. Determination of the state of operating mechanical stresses acting on surface piping with problems of differential collapses in the Venta de Carpio Terminal; Determinacion del estado de esfuerzos mecanicos actuantes en tuberias superficiales con problemas de hundimientos diferenciales en la Terminal Venta de Carpio

    Energy Technology Data Exchange (ETDEWEB)

    Neri B, Ernesto R; Garcia E, Nairoby [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2004-07-01

    The Venta de Carpio Terminal is located in the Northern part of the old Texcoco Lake, State of Mexico, in highly compressible soil. In it, it is received, regulated, measured and distributed natural gas, LP gas and PEMEX Refinacion products that are supplied to distribution terminals of and consumption centers located in the central area of the country, that encompasses the states of Puebla, Tlaxcala, Mexico, Hidalgo, Queretaro and a small part of the Federal District. The construction of the Venta de Carpio station dates from 1960; since then, it has presented important regional settlements, mainly due to the water extraction of the subsoil, that have imposed deformations to the piping systems connected to the surface facilities that have been piloted in the terminal. Equally, other surface piping systems and facilities present deformations by differential settlement between their supports. [Spanish] La Terminal Venta de Carpio se ubica en la parte norte del antiguo Lago de Texcoco, Estado de Mexico, en terreno altamente compresible. En ella, se recibe, regula, mide y distribuye gas natural, gas LP y productos de Pemex Refinacion que se suministran a terminales de distribucion y centros de consumo localizados en el area central del pais, que comprende los estados de Puebla, Tlaxcala, Mexico, Hidalgo, Queretaro y una pequena parte del Distrito Federal. La construccion de la estacion Venta de Carpio data de 1960; desde entonces, se han presentado asentamientos regionales importantes debidos, principalmente a la extraccion de agua del subsuelo, que han impuesto deformaciones a los sistemas de tuberias conectados con las instalaciones superficiales que han sido piloteadas en la terminal. De igual modo, otros sistemas de tuberias e instalaciones superficiales presentan deformaciones por hundimientos diferenciales entre sus apoyos.

  20. Determinaciones de isótopos estables en restos humanos de la región Cantábrica : Aportación al estudio de la dieta de las poblaciones del Mesolítico y el Neolítico

    Directory of Open Access Journals (Sweden)

    Pablo Arias Cabal

    2005-01-01

    Full Text Available Se presentan los resultados de una serie de análisis de isótopos estables de carbono y el nitrógeno realizados sobre colágeno de huesos humanos del Paleolítico Superior, el Mesolítico, el Neolítico, la Edad del Bronce y las Edades Media y Moderna. Como en otras zonas de la Europa atlántica, en la región Cantábrica se constata un fuerte incremento del consumo de proteínas de origen marino durante el Mesolítico, y un regreso a una dieta básicamente terrestre en el Neolítico. La variabilidad constatada en las muestras mesolíticas permite plantear la coexistencia de grupos que explotaban los recursos marinos y otros centrados en las zonas interiores.

  1. A radiochemical procedure for a low-level measurement of ''241Am in environmental samples using a supported functional organo phosphorus extractant; Metodo analitico para la determinacion de ''241Am en muestras biologicas y sedimentos marinos mediante uso de una columna con extractante organico

    Energy Technology Data Exchange (ETDEWEB)

    Gasco, C.; Anton, M. P.; Alvarez, A.; Navarro, N.; Salvador, S.

    1994-07-01

    The transuranides analysis in environmental samples is carried out by CIEMAT using standardized methods based on sequential separation with ionic-exchange resins. The americium fraction is purified through a two-layer ion exchange column and lately in an anion-exchange column in nitric acid methanol medium. The technique is time consuming and the results are not completely satisfactory (low recovery and loss of a-resolution) for some samples. The chemical compound CMPO (octyl(phenyl)-N,N-diisobutyl carbomoylmethyiphosphine oxide) dissolved in TPB (tributyl phosphate) and supported on an inert substrate has been tested directly for ''241Am analysis by a large number of laboratories. A new method that combines both procedures has been developed. The details of the improved procedure are described in this paper. The advantages of its application to environmental samples (urine, faeces and sediments) are discussed. The utilization of standard samples, with americium certified concentrations confirms the reliability of our measurements. (Author) 8 refs.

  2. Application of the pM{sup '}-pC{sub H} diagrams in the determination of hydrolysis constants of the lanthanides; Aplicacion de los diagramas pM{sup '}-pC{sub H} en la determinacion de las constantes de hidrolisis de los lantanidos

    Energy Technology Data Exchange (ETDEWEB)

    Lopez G, H.; Jimenez R, M.; Solache R, M. [Instituto Nacional de Investigaciones Nucleares, Departamento de Quimica, A.P. 18-1027, 11801 Mexico D.F. (Mexico); Rojas H, A. [Universidad Autonoma Metropolitana, Departamento de Quimica, Area de Quimica Analitica (Mexico)

    2001-07-01

    The pM{sup '}-pC{sub H} diagrams allowed to determine the saturation and non-saturation zones of Lu(OH){sub 3} in solid phase and those were applied for determining the hydrolysis and lutetium solubility constants, using the radioactive isotope Lu-177. The first constant of hydrolysis was also determined by the potentiometric method in absence of solid phase. (Author)

  3. Study on generation and granulometry of a standard aerosol of CINa for use in determinations of filtration efficiency of absolute filters; Estudio sobre la generacion y granulometria de un aerosol patron de CINa para la determinacion de eficacias filtrantes de filtros absolutos

    Energy Technology Data Exchange (ETDEWEB)

    Milla, E.

    1978-07-01

    This work has as objective the study of the conditions of generation and granulometry of an aerosol generated by atomizing with compressed a i r a solution of CINa in water in order to obtain particles, CINa cubes. The droplets of the spray formed are dried in a stream of air, acting as a carrier, inside the pipe of a bank of test filters. The granulometric analysis has been carried out by sampling in the gaseous phase. A dispersion photometer was used that yields the size spectrum of particles. The variables concerned in generation, whose influence on aerosol granulometry were analyzed are: characteristic diameter of atomizer unit, pressure of compressed air of generation, concentration of saline solution, temperature of air carrier, length of bank pipe, sampling position across a section, length of sampling duct and ratio between speeds in pipe and duct. (Author) 50 refs.

  4. Determination of uranium and {sup 2}10Po in the river Odiel to assess the radioactive impact of acid mine drainage; Determinacion de uranio y {sup 2}10Po en el rio Odiel para valorar el impacto radiactivo de los drenajes acidos mineros

    Energy Technology Data Exchange (ETDEWEB)

    Manjon, G.; Lehritani, M.; Mantero, J.; Diaz Frances, I.; Garcia-Tenorio, R.

    2013-07-01

    Since 1986 this research group has been monitoring of radioactive environmental impact in the estuary of the river Odiel, generated by the factories of production of phosphoric acid from Huelva, that emitting NORM waste. Once closed factories, is observed a second source of contamination: mining drains. To verify this source have been studied concentration levels of natural radionuclides in the waters and sediments of the river Odiel, in areas that are incorporated drains. (Author)

  5. A acurácia da determinação do VO2max e do limiar anaeróbio La exactitud en la determinacion del VO2máx y del umbral anaerobico Accuracy of VO2max and anaerobic threshold determination

    Directory of Open Access Journals (Sweden)

    Paulo Cesar N Granja Filho

    2005-06-01

    Full Text Available São raros estudos que tratam da acurácia de parâmetros de trocas gasosas durante o esforço, com a população brasileira. OBJETIVO: Determinar a confiabilidade do consumo máximo de oxigênio (VO2max e do limiar anaeróbio (LAn, assim como, a objetividade do segundo (LAn em adultos jovens saudáveis. MÉTODOS: Foram aplicados dois testes de esforço máximo, a partir dos quais dois observadores independentes determinaram o LAn através do método de inspeção visual. Os dados foram tratados por meio da análise de regressão, coeficiente de correlação intraclasse (CCI, ANOVA com dois fatores com teste post hoc de Tukey e teste t pareado para alfa Son raros los estudios que tratan de la exactitud de los parámetros de cambios gaseosos durante el esfuerzo con la población brasileña. OBJETIVO: Determinar la confiabilidad del consumo máximo de oxigeno (VO2max y del umbral anaeróbico (LAn, así como la objetividad del segundo, (LAn en adultos jovenes saludables. MÉTODOS: Fueron aplicados dos tests de esfuerzo máximo, a partir de los cuales dos observadores independientes determinaron el LAn a través del método de inspección visual. Los datos fueron tratados por medio del análisis de regresión, coeficiente de relación intraclase (CCI, ANOVA com dos factores con test post hoc de Tukey y el test t apareado para alfa Studies on the accuracy of the gas exchange and ventilation parameters during exertion involving the Brazilian population are scarce in literature. OBEJCTIVE: To determine the reliability of the maximal oxygen intake (VO2max and anaerobic threshold (AnT, as well as the objectivity of the AnT determination in Brazilian healthy youth adults. METHODS: Two tests of maximal exertion were applied. Two independent observers applied the visual inspection method for the AnT determination. The data were compared by means of the regression analysis, intraclass correlation coefficient (ICC, two-way ANOVA and the paired t-test for an alpha < 0.05. The intra-observer and intra-subject variabilities were determined by means of the typical error (s and variation coefficient (VC. RESULTS: No significant differences between tests for the VO2max and AnT determination as well as between observers in AnT determination were observed. The new VO2max presented ICC = 0.97, s = ± 0.14 L • min-1, and VC = ± 5.5%. The AnT presented ICC = 0.90, s = ± 0.14 L • min-1, and VC = ± 9.2%. The inter-observers AnT determination presented ICC = 0.95, s = 0.1 L • min-1 and VC = 5.6%. CONCLUSION: The VO2max and the AnT are reliable measurements, and the AnT determination was demonstrated to be an objective method in the population studied.

  6. Spectrographic determination of boron and silicon in uranium tetrafluoride: Study of the chemical reactions in the electrode cavity when ZnO is used as a uranium excitation suppressor; Determinacion espectrografica de Boro y Silicio en Tetrafluoruro de Unraio: Estudio de las reacciones quimicas que tienen lugar en el crater del electrodo al autilizar ZnO como supresor de la excitacion del Uranio

    Energy Technology Data Exchange (ETDEWEB)

    Alduan, F. A.; Capdevila, C.; Rosa, M.

    1973-07-01

    A method has been developed for determining traces of boron and silicon in uranium tetrafluoride. Use is made of zinc oxide to decrease the volatilization of uranium and achieve high sensitivities. The thermochemical reactions which occur in the anode cavity during the arcing process have been investigated. UO{sub 2} and a uranium, zinc and fluorine compound, both less volatile than uranium tetrafluoride, are formed. (Author)

  7. Polarographic determination of Iodide and Iodate, in Solutions Coming from Aerosols in Fission Products Containment Studies in Nuclear Power Stations; Determinacion Polarografica de Especies de Iodo (Ioduro y Iodato) en Soluciones Procedentes de Aerosoles, para Estudios de Contencion de Productos de Fision en Centrales Nucleares

    Energy Technology Data Exchange (ETDEWEB)

    Sanchez, M.; Ballesteros, O.; Fernandez, M.; Clavero, M.; Gonzalez, A. M. [Ciemat, Madrid (Spain)

    2000-07-01

    A polarographic method is described for the iodine species determination, iodide and iodate in water solutions. the iodate can be determined by differential pulse polarography. Calibration curves and the detection and determination limits have been obtained. Iodides is oxidized to iodate with sodium hypochlorite and the excess of oxidizing agent is destroyed with sodium sulphide. The concentration of iodide is calculated as the difference between the concentration of iodate in the sample before and after the oxidation. As an application, species of iodine in samples coming from the experimental plants GIRS (Gaseous Iodine Removal by Sprays) of Nuclear Fission Department of the CIEMAT, dedicated to fission products containment studies in nuclear power station, were determined. (Author) 10 refs.

  8. Determination of the neutron fluence in the welding of the 'Core shroud' of the BWR reactor core; Determinacion de la fluencia neutronica en las soldaduras del 'core shroud' del nucleo de un reactor BWR

    Energy Technology Data Exchange (ETDEWEB)

    Lucatero, M.A.; Xolocostli M, J.V.; Gomez T, A.M.; Palacios H, J.C. [ININ, 52750 Ocoyoacac, Estado de mexico (Mexico)]. e-mail: mal@nuclear.inin.mx

    2006-07-01

    With the purpose of defining the inspection frequency, in function of the embrittlement of the materials that compose the welding of the 'Core Shroud' or encircling of the core of a BWR type reactor, is necessary to know the neutron fluence received for this welding. In the work the calculated values of neutron fluence accumulated maxim (E > 1 MeV) during the first 8 operation cycles of the reactor are presented. The calculations were carried out according to the NRC Regulatory Guide 1.190, making use of the DORT code, which solves the transport equation in discreet ordinate in two dimensions (xy, r{theta}, and rz). The results in 3D were obtained applying the Synthesis method according to the guide before mentioned. Results are presented for the horizontal welding H3, H4, and H5, showing the corresponding curves to the fluence accumulated to the cycle 8 and a projection for the cycle 14 is presented. (Author)

  9. Neural network design with combined backpropagation and creeping random search learning algorithms applied to the determination of retained austenite in TRIP steels; Diseno de redes neuronales con aprendizaje combinado de retropropagacion y busqueda aleatoria progresiva aplicado a la determinacion de austenita retenida en aceros TRIP

    Energy Technology Data Exchange (ETDEWEB)

    Toda-Caraballo, I.; Garcia-Mateo, C.; Capdevila, C.

    2010-07-01

    At the beginning of the decade of the nineties, the industrial interest for TRIP steels leads to a significant increase of the investigation and application in this field. In this work, the flexibility of neural networks for the modelling of complex properties is used to tackle the problem of determining the retained austenite content in TRIP-steel. Applying a combination of two learning algorithms (backpropagation and creeping-random-search) for the neural network, a model has been created that enables the prediction of retained austenite in low-Si / low-Al multiphase steels as a function of processing parameters. (Author). 34 refs.

  10. Experimental determination of the constant of Sieverts and values diffusion for H{sub 2} and D{sub 2} in LiPb eutectico; Determinacion experimental de la constante de Sieverts y valores de difusion para H{sub 2} y D{sub 2} en LiPb eutectico

    Energy Technology Data Exchange (ETDEWEB)

    Moral, N.; Martinez, P. M.; Wirth, E.; Moreau, S.; Perlado, J. M.; Sedano, L.

    2010-07-01

    The hydrogen transport parameters as constant diffusivity Sieverts and a lithium-lead alloy are key magnitudes for measuring the level of tritium in the control Breeding Blanket (BE, Regenerating wrap) and for the design of auxiliary systems BB. We have used the technique of isovolumetric Desorption (ID) to investigate the behavior of hydrogen PCTPro{sub 2}000a using commercial equipment, SETARAM manufactured by Measurements were conducted at 112 and D{sub 2} in different samples do LiPb alloy, one provided by the commercial house Stachow GmBH and the other produced in laboratories IPUL-labs (Latvia). The experiment temperature range was between 300 and 400 degree centigrade and a pressure 0.I5MPa lOOhPa. [31 experimental device and transport parameters obtained, diffusivity and solubility of hydrogen in lithium-lead are presented and discussed.

  11. Construction of an external electrode for determination of electrochemical corrosion potential in normal operational conditions of an BWR type reactor for hot cells; Construccion de un electrodo externo para determinacion del potencial de corrosion electroquimico en condiciones normales de operacion de un reactor tipo BWR para celdas calientes

    Energy Technology Data Exchange (ETDEWEB)

    Aguilar T, J.A.; Rivera M, H.; Hernandez C, R. [Departamento de Sintesis y Caracterizacion de Materiales, Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    2001-07-01

    The behavior of the corrosion processes at high temperature requires of external devices that being capable to resist a temperature of 288 Centigrade and a pressure of 80 Kg/cm{sup 2}, to give stable and reproducible results of some variable and resisting physically and chemically the radiation. The external electrode of Ag/AgCl fulfils all the requirements in the determination of the electrochemical corrosion potential under normal operational conditions of a BWR type reactor in hot cells. (Author)

  12. Determination of Rn{sup 222} in samples of well water and domicile of the cities of Chihuahua and Aldama, Mexico; Determinacion de Rn{sup 222} en muestras de agua de pozos y domicilio de las ciudades de Chihuahua y Aldama, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Villalba, L.; Colmenero S, L.; Montero C, M.E. [Centro de Investigacion en Materiales Avanzados (CIMAV), Av. Miguel de Cervantes Saavedra 120, 31109 Chihuahua (Mexico)]. e-mail: lourdes.villalba@cimav. edu. mx

    2004-07-01

    The study of the content of dissolved Rn{sup 222} is presented in underground water and of domicile of the cities of Chihuahua and Aldama of the State of Chihuahua. The existence of the Rn{sup 222} in the underground waters comes from its constant production in the rocks of the terrestrial bark. It has been determined that the radon is a noble gas of more solubility in the water, this solubility induces high concentrations in underground water, as well as bigger risk to the health in the human body once ingested or inhaled. Of the 32 wells studied in the cities of Chihuahua and Aldama, the content of dissolved Rn{sup 222} in the water of 22 of them is bigger than 11 Bq/l and of 73 studied samples of water of domiciles 47 show bigger values that 11 Bq/l. These radon contents are attributable to the uraniferous rocks present in the aquifers. (Author)

  13. A geodetic coseismic fault-slip model for the May, 11{sup t}h 2011 Lorca earthquake using radar interferometry and GPS; Determinacion geodesica del deslizamiento de falla para el terremoto de Lorca del 11 de Mayo de 2011 usando interferometria radar y GPS

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez, P. J.; Tiampo, K. F.; Palano, M.; Cannovo, F.; Fernandez, J.

    2012-07-01

    The Alhama de Murcia Fault (AMF) is a compound multi-segmented oblique left-lateral fault system. The AMF is one the longest faults in the Eastern Betics Shear zone (Southeastern Spain). In the last decades its seismogenic potential has been carefully evaluated based on paleoseismological data. On May 11{sup t}h, 2011 a moderate (Mw 5.1) earthquake shook the region, causing nine casualties and severe damage in Lorca city (Murcia region). The early reported location of the aftershock sequence did not draw any particular trend; furthermore in-situ geology surveys did not identify any surface coseismic slip-related ground deformation. In order to provide better seismic hazard assessments, we need to locate and, if possible, characterize the fault-slip distribution that generated this earthquake. In this work, we detected small but significant ground deformation close to the epicentral area of the Lorca earthquake by using geodetic (satellite radar interferometry and GPS) data. Geodetic data was processed by using a stack of differential radar interferograms (corrected for a known long-term subsidence contribution), daily GPS estimated coordinates and high-rate 1-Hz GPS data. We jointly inverted the detected static coseismic displacements for the fault plane geometry parameters by using a rectangular dislocation model embedded in a homogeneous elastic half-space. The best-fitting fault plane closely follows the geologically derived AMF geometry (NE-SW strike trend and dipping {approx}70 degree centigrade to NW). Later, the obtained model geometry was extended and divided into patches to allow for a detailed analysis of the fault slip distribution pattern. Slip distribution indicates that slip occurred in a main patch 4-5 km long with reverse and left lateral motion (with peak fault slip magnitude of {approx}20 cm). However, the modelling results also indicate that fault slip occurred close to the surface along the centre and southwest of the city of Lorca. The shallower character of the slip and the effect of a finite dynamic rupture fault arrest probably caused the relatively intense ground acceleration recorded in the city of Lorca ({approx}0.4g) and increased the building damage. This study also represents the first modern geodetic ally observed ground deformation signature due to seismic activity in the Iberian Peninsula. (Author) 33 refs.

  14. Determination {sup 230}Th by ICP-MS for the control of activities of restoration of an area of land contaminated with uranium mining sterile; Determinacion de {sup 230}Th mediante ICP-MS durante el control de las actividades de restauracion de un area de terreno contaminada con esteriles de mineria de uranio

    Energy Technology Data Exchange (ETDEWEB)

    Yague, L.; Conde, E.; Navarro, N.; Fernandez, M.; Ortiz, M. I.; Noguerales, C.; Gasco, C.

    2013-07-01

    In 2012, within the activities for the Project PIMIC (CIEMAT) took out the first stage of restoration of a contaminated area. This is an area which had a residual contamination due to burial tailings uranium mining. The activities have been: elimination of the arboreal mass, excavation of the ground and earthmoving. The methodology applied is described in this work and is based on the combination of gamma spectrometry technique and development of a method of analysis {sup 230}Th by ICP-MS. (Author)

  15. Determinacion de la configuracion E-Z de los acidos Fumarico y Maleico. Un experimento orientado a incentivar el desarrollo de la investigacion cientifica en alumnos de Pregrado Determination of the E-Z fumaric and maleic acids configuration. An experiment designed to develop scientific research abilities in undergraduates students

    Directory of Open Access Journals (Sweden)

    Carlos Bustos

    2000-08-01

    Full Text Available In this work we intend to eliminate the idea that laboratory exercises seem like cookbooks. That is, exercises shall be presented as a problematic situation. Based on observation and experimentation, the students should determine the E-Z configuration of maleic and fumaric acids. The basis of this laboratory exercise is the acid-catalyzed isomerization of maleic acid to fumaric acid. Students are given the starting material, reagents and the experimental procedure. They are told that the starting material is a dicarboxylic acid containing a C=C double bond of formula C4H4O4. Students determine melting points, solubilities, acidity and chromatographic patterns for both the starting material and the product, so that a configuration of each acid can be proposed. This type of experiment yields excellent results, because the students are left to deduce that maleic acid is less stable than fumaric acid. Additionally, they conclude that maleic acid is the "Z" isomer and fumaric acid is the "E" isomer. Finally, this laboratory exercise allows the students to develop simultaneously their critical-thinking skills with the respective laboratory techniques and not to see chemistry as recipes to be followed.

  16. Sensitivity analysis of the influence of the medium energy and initial fluence FWHM of electron determining a Bremsstrahlung photon spectrum of a linear accelerator; Analisis de sensibilidad de la influencia de la energia media FWHM de la influencia inicial de electrones en la determinacion de un espectro de fotones Bremsstrahlung de un acelerador lineal

    Energy Technology Data Exchange (ETDEWEB)

    Juste, B.; Miro, R.; Verdu, G.; Diez, S.; Campayo, J. M.

    2012-11-01

    A correct dose calculation in patient under radiotherapy treatments requires and accurate description of the radiation source. The main goal of the present work is to study the effects of initial electron beam characteristics on Monte Carlo calculated absorbed dose distribution for a 6 MeV linac photon beam. To that, we propose a methodology to determine the initial electron fluence before hitting the accelerator target for an Elektra Precis a medical linear accelerator. The method used for the electron radiation source description is based on a Software for Uncertainty and Sensitivity Analysis (SUSA) and Monte Carlo simulations using the MCNP5 transport code. This electron spectrum has been validated by means of comparison of its resulting depth dose curve in a water cube with experimental data being the mean difference below the 1%. (Author)

  17. Study of the influence of the composition and density of the cement for the determination of the efficiency to the extent of using homogeneous packages ISOCS; Estudio de la influencia de la composicion y densidad del cemento para la determinacion de la eficiencia en la medida de bultors homogeneos mediante ISOCS

    Energy Technology Data Exchange (ETDEWEB)

    Marijuan, M. J.; Suarez-Navarro, J. A.; Esteban-Limenez, M. A.; Quinones, J.

    2013-07-01

    This work has studied the influence of the composition and density of the matrix, so as distance drum-detector in the determination of counting efficiencies, using Canberra [11-13], software ISOCS on drums with homogeneous residues. Also, efficiencies determined experimentally curves have been compared and using such software. The studies were carried out with the drum in a static position and with twist. A container prepared with soil samples was employed for the validation of the technical upgraded in the sample preparation laboratory and measured by the technique of segmented gamma spectrometry and the proposal in this paper. With the studies has established a methodology to determine the efficiency of measurement drums with waste homogeneous with twist.

  18. Study of an X-ray fluorescence thin film method for the determination of uranium in low activity solutions; Estudio de un metodo de fluorescencia de rayos X en capa delgada para la determinacion del uranio en soluciones de baja actividad

    Energy Technology Data Exchange (ETDEWEB)

    Diaz-Guerra, J. P.

    1980-07-01

    The application of the X-ray fluorescence thin film technique to the uranium determination in nitric solutions for a concentration range from 1 g/l to 100 g/l and activity levels under 5 mCi/ml is studied. The most suited excitation and measurement conditions are also studied and the uranium matrix effect correction, which is performed through the double dilution, {alpha}{sub U}U interaction coefficient calculation and internal standard methods, is discussed. The specimen preparation is satisfactorily accomplished by using P.V.C. filters fixed on aluminium supports. (Author) 18 refs.

  19. Analysis of sodium metal by X-ray fluorescence spectrometry (I). Determination of Hf, Mo, Nb, Ta, Ti, V and Zr; Analisis de sodio metal por espectrometria de fluorescencia de rayos X. Determinacion de Hf, Mo, Nb, Ta, Ti, V y Zr

    Energy Technology Data Exchange (ETDEWEB)

    Diaz-Guerra, J. P.

    1981-07-01

    A method allowing the determination of trace quantities of Hf, Mo, Nb, Ta, Ti, Vi and Zr in sodium metal previous transformation into Na{sub 2}S0{sub 4} is described. The enrichment of the impurities is performed through a coprecipitation technique in sulfuric medium by using Fe{sup 3}+ as a collector and cupferron or phenyfluorone as the precipitating reagent. The matrix influence and the best concentration of the collector (10/{mu}/ml), adequate pH (1,3 or 4, respectively) and optimum filter type (Millipore BSWP02500 or BDWP04700, respectively) have been studied, as well as the precipitation recoveries corresponding to the reagent above. It has been demonstrated the batter efficiency of the cupferron for determining all the Impurities. Detection limits range from 0.01 to 0.2 ppm., depending on the element, for samples 4 g in weight. An automatic spectrometer attached to a 16 K minicomputer and X-ray tube with a gold anode (2250-2700 W) are used. The Interferences between the lines ZrK{alpha} (2{sup n}d order) - HfL{alpha} and TiK{beta} - VK {alpha} have been studied and the respective correction coefficients have been deduced. (Author) 8 refs.

  20. A empiric expression to interpret the approximation of {lambda} cI phages to E. coli C{sub 6}00 bacteria; Determinacion experimental de la cinetica de laproximacion del fago /{lambda}cl a la bacteria E. coli C{sub 6}00 Expression empirica interpretativa del proceso

    Energy Technology Data Exchange (ETDEWEB)

    Garces, F.; Vidania, R. de

    1984-07-01

    In general the process of adsorption of phages to bacteria is considered in the bibliography as an statistical process. In this work we use an empiric expression which allows to interpret the approximation of {lambda}cI pages to E. coli C{sub 6}00 bacteria. This expression introduces some changes respect to a pure statistical description of the approximation process. (Author) 26 refs.

  1. Sensitivity analysis the influence of the average energy and FWHM of the initial fluence electrons in the determination of a spectrum of photons Bremsstrahlung of a linear accelerator; Analisis de sensibilidad de la influencia de la energia media y FWHM de la fluencia inicial de electrones en la determinacion de un espectro de fotones Bremsstrahlung de accelerador lineal

    Energy Technology Data Exchange (ETDEWEB)

    Justo, B.; Miro, R.; Verdu, G.; Diez, S.; Campayo, J. M.

    2011-07-01

    The main objective of this work is to study the effects of the initial beam characteristics of electrons in the absorbed dose distribution calculated by Monte Carlo for a photons beam of 6 MeV emitted by a medical linear accelerator.

  2. Optimization of the Analytical Method Using HPLC with Fluorescence Detection to Determine Selected Polycyclic Aromatic Compounds in Clean Water Samples; Optimizacion del Metodo Analitico mediante HPLC con Detector de Fluorescencia para la Determinacion de Ciertos Compuestos Aromaticos Policiclicos en Muestras de Aguas Limpias

    Energy Technology Data Exchange (ETDEWEB)

    Garcia Alonso, S.; Perez Pastor, R. M.

    2013-10-01

    A study on the comparison and evaluation of 3 miniaturized extraction methods for the determination of selected PACs in clear waters is presented. Three types of liquid-liquid extraction were used for chromatographic analysis by HPLC with fluorescence detection. The main objective was the optimization and development of simple, rapid and low cost methods, minimizing the use of extracting solvent volume. The work also includes a study on the scope of the methods developed at low and high levels of concentration and intermediate precision. (Author)

  3. Determination of the adaptive response induced In vivo by gamma radiation and its relation with the sensibility to the damage induction in the DNA and with the repairing capacity; Determinacion de la respuesta adaptativa inducida In vivo por radiacion gamma y su relacion con la sensibilidad a la induccion de dano en el ADN y con la capacidad de reparacion

    Energy Technology Data Exchange (ETDEWEB)

    Mendiola C, M.T

    2002-07-01

    The kinetics of damage induction and repair at different doses as well as the adaptive response induced by gamma ray exposure were determined in murine leukocytes in vivo. The damage-repair kinetics were established after the exposure to 0.5, 1.0 or 2.0 Gy in a {sup 137}Cs source. Peripheral blood samples were obtained from the tails of mice, the percentage of damaged cells and the DNA migration in each one were analyzed by the single cell gel electrophoresis (SCG) technique or comet assay. Results indicated that there was an induction of approximately 75% comets with the doses of 1.0 and 2.0 Gy, which was considerably reduced to 22% and 42% respectively during the first 15 minutes. This evidences the presence of a rapid repair process and suggests that leucocytes are genetically well prepared to repair this kind of damage. After 15 minutes, a second increase in the percentage of damaged cells that was proportional to dose occurred, which seems to represent the breaks produced during the repair of other kind of lesions. After that a second reduction was observed, reaching values near to the basal ones, except with the dose of 2.0 Gy. The kinetics obtained with the dose of 0.5 Gy was similar to that established with 1.0 Gy, but in this case the initial damage was 50 % lower. Besides, the adaptive response was observed after the exposure of the mice to an adaptive dose of 0.01 Gy and to a challenge dose of 1.0 Gy 60 minutes later. The pretreatment reduced the percentage of damaged cells caused by the challenge dose to one third approximately, and also diminished this parameter produced during the late repair process. This indicates that the early adaptive response is caused, instead of by an increment in repair, by the induction of a process that protects DNA from damage induction by radiation, i.e synthesis of substances that increase the scavenging of free radicals. (Author)

  4. Determination of the dosimetric properties of ZrO{sub 2}: Cu and it use in the ultraviolet radiation dosimetry; Determinacion de las propiedades dosimetricas de ZrO{sub 2}: Cu y su empleo en la dosimetria de la radiacion ultravioleta

    Energy Technology Data Exchange (ETDEWEB)

    Molina P, D. [Centro de Proteccion e Higiene de las Radiaciones, Apdo. Postal 6195, La Habana (Cuba); Olvera T, L.; Azorin N, J.; Barrera S, M.; Soto E, A.M. [UAM-I, Av. San Rafael Atlixco 186, 09340 Mexico D.F. (Mexico); Rivera M, T. [Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Unidad Legaria del IPN, Av. Legaria 694, 11500 Mexico D.F. (Mexico)]. e-mail: daniel@cphr.edu.cu

    2006-07-01

    In this work the experimental results of studying the thermoluminescent characteristics (TL) of the zirconium oxide doped with copper (ZrO{sub 2}: Cu) exposed to ultraviolet light of wavelength in the interval of 200-400 nm are presented. The material in powder form was prepared using the sol-gel method. The dosimetric characteristics studied includes the emission curve TL (curved TL), the thermoluminescent response in function of the wavelength, the minimum dose detectable and the lineality of the response. The TL response of the ZrO{sub 2}: Cu in function of the wavelength presents two maxima, in 260 and 290 nm, respectively. The TL curve of the ZrO{sub 2}: Cu showed two peaks, in 120 and 170 C, respectively, being its similar form for all the studied wavelengths. The response in function of the spectral irradiance results to be lineal in the interval from 160 to 2300 mJ/cm{sup 2}. The obtained results when studying the TL properties of ZrO{sub 2}: Cu exposed to the ultraviolet radiation show that it gathers dosimetric characteristics prominent to be used as an ultraviolet radiation dosemeter. (Author)

  5. Determination of the dose to patient due to the verification of radiotherapy treatments with x-ray image volume (CBCT); Determinacion de la dosis a paciente debida la de verificacion de tratamientos de radioterapia con imagen volumetrica de rayos x (CBCT)

    Energy Technology Data Exchange (ETDEWEB)

    Sanchez Carmona, G.; Luis Simon, F. J.; Mateos Perez, J. C.; Herrador Cordoba, M.

    2011-07-01

    The increasingly widespread use of image-guided radiotherapy (IGRT) has rigged a dose delivery additional patient is prescribed by your radiation treatment. The aim of this study is to determine the dose to the patient when the positioning is verified by X-ray image volumetric (Cone Beam CT)(CBCT) in the treatment of prostate volume by rotational therapy (VMAT) in our center.

  6. Determination of K{sub ps} and {beta}{sub 1,H} in a wide interval of initial concentrations of lutetium; Determinacion de K{sub ps} y {beta}{sub 1,H} en un amplio intervalo de concentraciones iniciales del lutecio

    Energy Technology Data Exchange (ETDEWEB)

    Lopez-G, H.; Jimenez R, M.; Solache R, M. [ININ. Apdo. Postal 18-1027, Mexico D.F. (Mexico); Rojas H, A. [UAM-I, A.P. 55-534, 09340, Mexico. D.F. (Mexico)

    2006-07-01

    solubility product constants and the first of lutetium hydrolysis in the interval of initial concentration of 3.72 X 10{sup -5} to 2.09 X 10{sup -3} M of lutetium, in a 2M of NaCIO{sub 4} media, at 303 K and under conditions free of CO{sub 2} its were considered. The solubility diagrams (pLu{sub (ac)}-pC{sub H}) by means of a radiochemical method were obtained, and starting from its the pC{sub H} values that limit the saturation and no-saturation zones of the solutions were settled down. Those diagrams allowed, also, to calculate the solubility product constants of Lu(OH){sub 3}. The experimental data to the polynomial solubility equation were adjusted, what allowed to calculate those values of the solubility product constants of Lu(OH){sub 3} and to determine the first hydrolysis constant. The value of precipitation pC{sub H} diminishes when the initial concentration of the lutetium increases, while the values of K{sub ps} and {beta}{sub 1,H} its remain constant. (Author)

  7. Quality in the organizations (enterprises and institutions of production and of services). Validation of the determination by atomic absorption of sodium and potassium in acid rain; Calidad de las organizaciones (empresas e instituciones de produccion y de servicios). Validacion de la determinacion por absorcion atomica de sodio y potasio en lluvia acida

    Energy Technology Data Exchange (ETDEWEB)

    Arreola T, D.L

    2005-07-01

    The present work is focused to the environmental area and in specific to the validation of an analytical method by means of one of the techniques more used for the determination of metals, the atomic absorption spectrophotometry. Applied to the study of the acid rain and its diverse forms in the nature. As well as their consequences and the role that the man carries out in the contribution toward this phenomenon. To approach the following text it will be mention shortly how is distributed, beginning with the introduction that is about the importance of the role of the acid rain, its effects and repercussions in the environment. In the first chapter the points that we should be evaluated to carry out a validation are analyzed. Being the main ones, the precision, accuracy, lineal interval, among others. Continuing in the second chapter with the foundation study, equipment and interferences of the atomic absorption spectrophotometry technique. The last chapter contains the experimental part, continuing for each evaluated point, from the experimental development, results and its analysis. (Author)

  8. Estimation of the water volume to be managed in the infrastructure of phase II of the artificial recharge plant in the El Carracillo region, Segovia (western area); Determinacion de los volumenes de agua a gestionar en las infraestructuras de la fase II del proyecto de recarga artificial del acuifero cuaternario de la comarca de El Carracillo, Segovia (sector occidental)

    Energy Technology Data Exchange (ETDEWEB)

    Macias Antequera, C.; Martinez Gamo, R.; Martinez Rubio, J.

    2014-10-01

    The first hydrogeological investigation for the definition of the Carracillo aquifer (Segovia) was carried out in order to plan the best possible artificial recharge works provided for within the framework of the Royal Decree- Law 9/1998 El Carracillo Aquifer Recharge. Intake and Pipeline Work, Infiltration and Irrigation Adequacy (Segovia) These studies revealed the existence of two regions hydro geologically favourable for water storage from flows derived from the river Cega: the first known as the paleo-landform site located within the irrigation area, and the second area called the storage area located in the eastern sector of the district. In order to exactly estimate the minimum and maximum volume of water that has to be managed in the paleo-landform site over a period of five years, the Tragsa Group has carried out, at the request of the Ministry of Agriculture Fisheries and Food, some of the hydrogeological work, which included the exhaustive follow up of the piezometric behaviour of the aquifer and the detailed analysis of each of the external actions that have a direct influence upon it, such as the useful rain, the artificial recharge, the extraction by pumping, and the overland flow, amongst others. (Author)

  9. Determination of the mechanical properties and fracture mechanisms of YSZ and GDC for electrolyte-supported SOFCs by instrumented indentation test; Determinacion de las propiedades mecanicas y mecanismos de fractura de electrolitos soportados de YSZ y GDC mediante ensayos de indentacion instrumentada

    Energy Technology Data Exchange (ETDEWEB)

    Roa, J. J.; Morales, M.; Capdevila, X. G.; Segarra, M.

    2010-07-01

    The main purpose of this work is to evaluate the different mechanical properties and the different fracture mechanisms activated during the instrumented indentation process of the electrolytes based on Yttria stabilized zirconia (YSZ) and gadolinia doped ceria (GDC), for solid oxide fuel cells (SOFCs). Both materials, with a thickness of 200 {mu}m, were shaped by uniaxial pressing at 500 MPa, and sintered at 1400 degree centigrade. Mechanical properties such as hardness (H) and Young's modulus (E) have been studied at different penetration depths using the Oliver and Pharr equations. The different fracture mechanisms activated during the instrumented indentation process have been studied at constant penetration depth of 500 nm, performed with a diamond Berkovich tip indenter. The residual indentation imprints have been observed with atomic force microscopy (AFM). The hardness and Young's modulus for YSZ electrolytes are higher than for GDC materials, due to the different fracture mechanism activated during the indentation process. As a result, the electrolytes of YSZ presented trans- and intergranular fracture mechanisms, depending on the place of the residual indentation imprint (in the grain boundary or in the middle of the grain, respectively). However, the GDC electrolyte revealed radical cracks at the corners of the residual nano indentation imprints, thus producing a phenomenon known as chipping. (Author)

  10. Uses of complexone III and ion exchange resins in colorimetric determination with o-phenanthroline of Fe traces in uranium compounds; Aplicacion de la complexona III y resinas combadoras a la determinacion colorimetrica con orto-fenantro-lina de trazas de dhierro en compuesto de uranio

    Energy Technology Data Exchange (ETDEWEB)

    Fernandez Cellini, R.; Ruiz Sanchez, F.

    1956-07-01

    The determination of small quantities of iron using o-phenanthroline, assumes the elimination of some cations interference by means of pH control before the formation of a coloured complex. We have eluded that difficulty by the connected action of complexones III and ion exchange. the previous forms quelate with the iron (III) with a stability constant high enough to permit the pass of an iron solution through a cation resin column without being fixed which never occurs with the interferer cations. Mercury is the only element with a similar stability, but it has been eliminated previously. (Author) 16 refs.

  11. Determination of the exposition rapidity in the level 49.90 of the reactor building for the decrease in the water level of the spent fuel pool; Determinacion de la rapidez de exposion en el nivel 49.90 del edificio del reactor por la disminucion en el nivel de agua de la alberca de combustible gastado

    Energy Technology Data Exchange (ETDEWEB)

    Mijangos D, Z. E.; Herrera H, S. F.; Cruz G, M. A.; Amador C, C., E-mail: zoedelfin@gmail.com [Comision Federal de Electricidad, Central Nucleoelectrica Laguna Verde, Subgerencia de Ingenieria, Km 44.5 Carretera Cardel-Nautla, 91476 Laguna Verde, Alto Lucero, Veracruz (Mexico)

    2014-10-15

    The fuel assemblies storage in the nuclear power plant of Laguna Verde (NPP-L V) represents a crucial aspect, due to the generated dose by the decay heat of the present radio-nuclides in the assemblies retired of the reactor core, after their useful life. These spent assemblies are located inside the spent fuel pool (SFP), in the level 49.90 m in the Reload Floor of the Reactor building of NPP-L V. This leads to the protection at personnel applying the ALARA (As Low As Reasonably Achievable) criteria, fulfilling the established dose criteria by the Regulator Body the Comision Nacional de Seguridad Nuclear y Salvaguardias (CNSNS). Considering the loss scenario of the cooling system of the SFP, in which the SFP water vaporizes, is important to know the water level in which the limit of effective dose equivalent is fulfilled for the personnel. Also, is important for the instrumentation of the SFP, for the useful life of the same instruments. In this work is obtained the exposition rapidity corresponding to different water levels of SFP in the Reload Floor of NPP-L V, to identify the minimum level of water where the limit of effective dose equivalent is fulfilled of 25 rem s to the personnel, established in the Article 48 of the General Regulation of Radiological Safety of CNSNS and the Chapter 50 Section 67 of the 10-Cfr of Nuclear Regulatory Commission in USA. The water level is also identified where the exposition rapidity is of 15 m R/hr, being the value of the set point of the area radiation monitor D21-Re-N003-1, located to 125 cm over the level 49.90 meters of the Reload Floor of NPP-L V. (Author)

  12. Utility of the tetrophosmine-{sup 99m}Tc in the determination of malignant tumours located in the muscle-skeletal system, preliminary report; Utilidad de la tetrofosmina-{sup 99m}Tc en la determinacion de malignidad de tumores localizados en el sistema musculoesqueletico, reporte preliminar

    Energy Technology Data Exchange (ETDEWEB)

    Garcia R, J.C.; Gonzalez, I.F.; Rico, G.; Linares, L.M.; Delgado C, E.; Baena, L. [Centro Nacional de Rehabilitacion, Mexico D.F. (Mexico); Adame, G.; Gonzalez R, D. [MIYMSA, Mexico D.F. (Mexico); Perez C, J.P.; Valencia, S. [Hospital medica Sur, Mexico D.F. (Mexico)

    2005-07-01

    From its authorization by the FDA, as radiopharmaceutical to be used in studies of myocardial perfusion, multiple articles have appeared in the literature it prescribes that its validate the use of the tetrophosmine-{sup 99m}Tc in the valuation of different tumors, so much in the determination of malignancy, like in the evolution and in the response to the treatment. For that reason the objective of this protocol is to evaluate the utility of the tetrophosmine- {sup 99m}Tc in the determination of malignancy in non treated tumors located in the skeletal muscle system, in a population of 40 patients coming from the service of bony tumors of the National Center of Rehabilitation. For the time being its report the discoveries in 27 studies. (Author)

  13. Radiotherapy with linear accelerator in a patient with permanent pacemaker, methodology and results of dose determination in a case in vivo; Radioterapia con Linac en un paciente con marcapasos permanente, metodologia y resultados de determinacion de dosis en un caso in vivo

    Energy Technology Data Exchange (ETDEWEB)

    Diaz A, P.; Dominguez O, X.; Toledo B, V.; Nungaray, H.; Zazueta L, F., E-mail: pdiaz@hospitalsanjavier.co [Hospital San Javier, Pablo Casals No. 640, Col. Prados Providencia, 44670 Guadalajara, Jalisco (Mexico)

    2010-09-15

    This work presents the methodology used by the radiotherapy department of the Hospital San Javier in the patients handling with pacemaker. By means of dosimetry to the implant area of the pacemaker together with electrocardiography measurements during the radiotherapy sessions, the pacemaker performance is evaluated with the objective of detecting any anomaly to the same caused by electromagnetic interference and/or accumulated dose. It is necessary to follow specific protocols in these patients type that guarantee their security during the exposition to ionizing radiation since a definitive consent that allows to calculate the failure probability of pacemaker in this therapeutic condition does not exist. (Author)

  14. Risk evaluation on internal corrosion of a gas pipeline cut section based on metal mechanic tests and physiochemical analysis of the solids deposited in the pipes; Determinacion del riesgo por corrosion interna de un tramo cortado de una linea de transporte de gas natural a partir de ensayos metalmecanicos y del analisis fisicoquimico de los solidos depositados en la tuberia

    Energy Technology Data Exchange (ETDEWEB)

    Ditta Sarmiento, Johanna Milena [PETROBRAS International (BRASPETRO) (Colombia). Ingenieria de Corrosion DPSU

    2003-07-01

    After inspecting a one of the most important pipelines in Colombia, using intelligent tool, the pipe sections were selected that presented losses of thickness which probably they would be risking integrity of the same one and after, these sections were cut and replaced. To one of the cut sections a study with the objective was made him establish the present forms of corrosion and to determine the phenomena that influenced the presence of the damages. For this study were moderate thicknesses of the wall of the tube and was determined the criticality comparing it with its nominal thickness, according to Standard ASME B - 31G. Taking advantage of the presence solids in the surface, one became both, physical and chemical analysis, DRX and elementary analysis, with the objective to determine its origin and to correlate it with the types of corrosion that were in the line. The morphology that determined were Microbiological Influenced Corrosion, Erosion - Corrosion, Pitting and CO2 corrosion. Then, from all this information the analysis becomes of risks by internal corrosion in pipeline, the plan of mitigation and the plans of monitoring and inspection of the line to avoid the presence of anyone of these forms of corrosion in the future immediate. (author)

  15. Study on the preparation and stability of uranium carbide samples for the determination of oxygen, hydrogen and nitrogen by fusion under high vacuum; Estudio sobre la preparacion y estabilidad de las muestras de carburo de uranio para la determinacion de oxigeno, hidrogeno y nitrogeno por fusion en alto vacio

    Energy Technology Data Exchange (ETDEWEB)

    Perez Garcia, M.

    1966-07-01

    In view of the high reactivity of uranium carbide, the method employed for the preparation of the sample for the analysis of its gas content: oxygen, hydrogen and nitrogen, has a decisive influence on the analytical results. The variation in the O{sub 2}, H{sub 2} and N{sub 2} content of the uranium carbide has been studied in this paper with the methods utilized for the sample preparation (grinding and cutting). (Author) 9 refs.

  16. Determination of the hydrolysis constants of Europium (III), in ion strength media 4, 5 and 6 M NaClO{sub 4} at 303 K; Determinacion de las constantes de hidrolisis del Europio (III), en medios de fuerza ionica 4, 5 y 6 M de NaClO{sub 4} a 303 K

    Energy Technology Data Exchange (ETDEWEB)

    Alvarado B, A.; Jimenez R, M.; Solache R, M. [Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    1999-07-01

    This work was made with the purpose to complete information about the hydrolysis constants of Europium (III) in high ion strength media. So it was determined at a ion forces media 4, 5 and 6 M of sodium perchlorate at 303 K. The method used was the potentiometric with the aid of the Super quad computer program. In high ion strength media, the measurements of p H do not correspond directly to negative logarithm of the concentration of hydrogen ions, by this it is necessary to calibrate the electrode in these conditions. The Europium was hydrolized at pC{sub H} values greater 6 in all cases. The potentiometric method used under the described experimental conditions is adequate to determine the hydrolysis constants of Europium (III). According to the results and diagrams of chemical species of Europium obtained we can conclude that the hydrolysis constants, differ by its distribution but not in its identity. (Author)

  17. Procedure Development to Determine Organic Compounds in the PM{sub 1}-2.5 and PM{sub 2}.5-10 Fractions of Atmospheric Aerosols; Desarrollo de la Metodologia para la Determinacion de los Compuestos Organicos en las Fracciones PM{sub 1}-2.5 y PM{sub 2}.5-10 del Aerosol Atmosferico

    Energy Technology Data Exchange (ETDEWEB)

    Pindado, O.; Perez, R. M.

    2011-07-28

    An analytical procedure development to measure organic compounds such as aliphatic hydrocarbons, polycyclic aromatic compounds, n-alcohols and fatty acids in PM{sub 1}-2.5 and PM{sub 2}.5-10 of atmospheric aerosol is accomplished. The development encompasses an optimization of extraction step, derivatization step and chromatographic analysis. The method developed consists in a microwave extraction, followed by a stage of fractionation and analysis by GC/MS. (Author) 20 refs.

  18. Spectrographic determination of impurities in ammonium bifluoride. III. Study of the processes of vaporization, transport and excitation of the elements Al, B, Cu and Cr; Determinacion espectrografico de impurezas en bifluoruro amonico. III. Estudio de los procesos de volatilizacion, transporte y excitacion de los elementos Al, B, Cu, Cr

    Energy Technology Data Exchange (ETDEWEB)

    Alduan, F. A.; Roca, M.; Capdevila, C.

    1979-07-01

    The influences of the processes of vaporization, transport and excitation on the shape of the volatilization-excitation curves and on the values of the spectral-line intensities have been investigated in a method for the spectrographic determination of Al, B, Cu and Cr In ammonium bifluoride samples by direct current are excitation in Scribner type electrodes, with addition of different matrices (graphite, 63203, GeO{sub 2}, MgO and Zn0). The reaction products in the electrode cavity have been identified by X-ray powder diffraction analysis and the percentages of vaporized and diffused element evaluated through analysis by total-burning spectrographic methods. In addition, the values of both the number of particles entering the discharge column and the transport efficiencies have been calculated. Thus, the origin of most observed differences has been explained. (Author) 11 refs.

  19. Determinacion de la viabilidad de los métodos de captura de CO2 aplicada a las centrales españolas de generación de electricidad con consumo de carbón. Repercusión en la seguridad de suministro

    OpenAIRE

    M. Martín González; Clemente Jul, María del Carmen

    2015-01-01

    El carbón es un combustible ampliamente utilizado. Con una producción anual alrededor de las 8.000 millones de toneladas a nivel mundial, continúa siendo esencial para la generación de electricidad y la seguridad de suministro sobre todo en los países productores. Pese a la bajada de su uso, Europa utiliza el carbón en más de un 22% para la generación de electricidad, por lo que su sustitución además de no ser fácil, traería una serie de problemas técnicos y económicos irreversibles cómo los ...

  20. Upgrade in the CNSNS of the determination process about the importance for the impact evaluation to the safety of defaults or violations in the national nuclear facilities; Actualizacion en la CNSNS del proceso de determinacion de la importancia para la evaluacion de impacto a la seguridad de incumplimientos o violaciones en las instalaciones nucleares mexicanas

    Energy Technology Data Exchange (ETDEWEB)

    Espinosa V, J. M.; Jauregui Ch, V., E-mail: jmespinosa@cnsns.gob.mx [Comision Nacional de Seguridad Nuclear y Salvaguardias, Dr. Barragan No. 779, Col. Narvarte, 03020 Mexico D. F. (Mexico)

    2014-10-15

    Inside the process of Impact Evaluation to the Safety of the Direccion General Adjunta de Seguridad Nuclear of the Comision Nacional de Seguridad Nuclear y Salvaguardias (CNSNS) the Significance Determination Process (SDP) is used, developed by the United States Nuclear Regulatory Commission (US NRC), to evaluate the violations or defaults to the regulatory framework and to determine its importance to the risk by means of a fixed color: Green (Very low impact to the safety), White (Low impact to moderate to the safety), Yellow (Substantial impact to the safety) or Red (High impact to the safety). All this inside the seven safety foundations of the Reactor Oversight Process: Initiator Events, Mitigation Systems, Integrity of the Barriers, Preparation for Emergencies, Occupational Radiological Safety, Radiological Safety of the Public and Physical Safety. At present the US NRC has developed a new version of the SDP, which presents changes in its structure and the opportunity of carrying out informed evaluations in risk, with more detail about the violations or defaults that happen in different areas. The CNSNS carries out the adaptation of this last version of the SDP in order to have an updated tool for the violations and defaults characterization to the regulatory framework happened in the nuclear power plant of Laguna Verde. In this article is mentioned the legal framework that confers the CNSNS the attributions to impose urgency measures and administrative sanctions to its licensees, also is established the definition of the different colors that the SDP contemplates in function of the increased risk (ΔCdf), a description of the SDP objectives and the elements that conform it is presented, in the same way some examples to illustrate its application are raised. Finally, the steps to continue for their implementation are mentioned. (Author)

  1. Determination of the sensitization of two coatings by steel welding 308l by the EPR-Dl and Astm A-262 practice A techniques; Determinacion de la sensibilizacion de dos revestimientos por soldadura de acero 308L por las tecnicas EPR-DL y ASTM A-262 practica A

    Energy Technology Data Exchange (ETDEWEB)

    Arganis J, C. R.; Zenteno S, J. C.; Robles F, J. L.; Rodriguez M, E.; Vazquez P, A., E-mail: carlos.arganis@inin.gob.mx [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico)

    2014-10-15

    A stainless steel 308l coating was deposited by the shielded metal arc welding (SMAW) on steel A36 with a thickness of 4.726 mm in three layers. The sensitization was measured with the technique of Electrochemical Potentiodynamic Reactivation of Double-loop (EPR-Dl), using a portable cell and other of conventional window. The standard Astm A-262, practice A was used to verify the sensitization values. Two samples were used, a welding on a plate of 323 x 172 x 76.2 mm and the second welding on the end of a plate of 12.7 mm of thickness and 280 mm of longitude, with a post-welding process with gas tungsten arc welding (GTAW) with electrode ERNiCr{sub 3} and a process SMAW with electrode ENICRFe{sub 3}. The coating on the plate showed low values of sensitization grade (DOS) in all the points, indicating a very quick heat extraction and an inter dendritic structure type step. The second sample presented DOS values that are related with a structure of low sensitization and the influence of the heat of the post-welding process and a structure of recrystallized grains. (Author)

  2. Determination of the ratio of the spectral fluence of electrons in water, using a Newton Cotes closed quadrature method: rule composed of trapezium with non equi-spaced nodes; Determinacion de la razon de fluencias espectrales de electrones en agua, usando un metodo de cuadratura cerrada de Newton Cotes: regla compuesta del trapecio con nodos no equi-espaciados

    Energy Technology Data Exchange (ETDEWEB)

    Moranchel y Rodriguez, M. [IPN, ESFM, Departamento de Ingenieria Nuclear, 07738 Mexico D.F. (Mexico)]. e-mail: mmoranchel@ipn.mx

    2008-07-01

    The central problem of the dosimetry of the ionizing radiations is the determination of the dissipated energy by unit of mass of irradiated material. This energy usually is inferred of ionization measures in a small cavity of air housed inside the material medium. The Bragg-Gray cavity theory was the first one in estimating the dissipated energy through the ionizations that the primary electrons cause in the cavity. The primary electrons are generated by photoelectric effect, pair production and by Compton dispersion of the photon beams that initially impact on the material. However, in a more realist approach the existence of secondary electrons due to the electron-electron interaction it will be considered. The Spencer-Attix cavity theory considers to the secondary electrons as responsible part for the energy deposited in the means, for that a total spectral fluence of electrons (primary and secondary) it appears in this theory. Few electrons spectra have been published, mainly, those that include the contribution of secondary electrons ({delta} rays). Leaving of the ideas of Spencer-Attix, in this work an approach method to determine the rate of electron spectral fluences (total regarding primary) for a wide variety of material Z, and energy sources T{sub 0} is presented. The method for materials used by Spencer-Attix is applied, it is proven its reliability and it is applied to the water like absorber medium by its importance in the clinical dosimetry. (Author)

  3. Determination of the exposure speed of radiation emitted by the linear accelerator, using the code MCNP5 to evaluate the radiotherapy room shields of ABC Hospital; Determinacion de la rapidez de exposicion de la radiacion emitida por el acelerador lineal, utilizando el codigo MCNP5, para evaluar los blindajes de la sala de radioterapia del Hospital ABC

    Energy Technology Data Exchange (ETDEWEB)

    Corral B, J. R.

    2015-07-01

    Humans should avoid exposure to radiation, because the consequences are harmful to health. Although there are different emission sources of radiation, generated by medical devices they are usually of great interest, since people who attend hospitals are exposed in one way or another to ionizing radiation. Therefore, is important to conduct studies on radioactive levels that are generated in hospitals, as a result of the use of medical equipment. To determine levels of exposure speed of a radioactive facility there are different methods, including the radiation detector and computational method. This thesis uses the computational method. With the program MCNP5 was determined the speed of the radiation exposure in the radiotherapy room of Cancer Center of ABC Hospital in Mexico City. In the application of computational method, first the thicknesses of the shields were calculated, using variables as: 1) distance from the shield to the source; 2) desired weekly equivalent dose; 3) weekly total dose equivalent emitted by the equipment; 4) occupation and use factors. Once obtained thicknesses, we proceeded to model the bunker using the mentioned program. The program uses the Monte Carlo code to probabilistic ally determine the phenomena of interaction of radiation with the shield, which will be held during the X-ray emission from the linear accelerator. The results of computational analysis were compared with those obtained experimentally with the detection method, for which was required the use of a Geiger-Muller counter and the linear accelerator was programmed with an energy of 19 MV with 500 units monitor positioning the detector in the corresponding boundary. (Author)

  4. Radiological protection on interstitial brachytherapy and dose determination and exposure rate of an Ir-192 source through the MCNP-4B; Proteccion radiologica en braquiterapia intersticial y determinacion de la dosis y tasa de exposicion de una fuente de Ir-192 mediante el MCNP-4B

    Energy Technology Data Exchange (ETDEWEB)

    Morales L, M.E. [INEN, Av. Angamos Este 2520- Surquillo, Lima (Peru)

    2006-07-01

    The present work was carried out in the Neurological Sciences Institute having as objective to determine the dose and the rate of exhibition of the sources of Iridium 192, Iodine 125 and Palladium 103; which are used to carry out implant in the Interstitial Brachytherapy according to the TG43. For it we carry out a theoretical calculation, its are defined in the enter file: the geometry, materials of the problem and the radiation source, etc; in the MCNP-4B Monte Carlo code, considering a punctual source and for the dose determination we simulate thermoluminescent dosemeters (TLD): at 5 cm, 50 cm, 100 cm and 200 cm of the source. Our purpose is to analyze the radioprotection measures that should take into account in this Institute in which are carried out brain biopsies using a Micro mar stereotactic mark, and in a near future with the collaboration of a doctor and a cuban physique seeks to be carried out the Interstitial Brachytherapy technique with sources of Ir-192 for patient with tumors like glioblastoma, astrocytoma, etc. (Author)

  5. Contributions te the study of methods and factors affecting the spectrophotometric determination of boron traces with carmin uranium compounds; Contribucion al estudio del metodo y factores que afectan a la determinacion espectrofotometrica de trazas de boro con Carmin en compuestos de uranio

    Energy Technology Data Exchange (ETDEWEB)

    Fernandez Cellini, R.; Gasco Sanchez, L.

    1956-07-01

    The study of some factors affecting the spectrophotometric determination of boron traces with carmin is made; the influence of carmin from different origin, the stability of complex carmin-boric acid in relation with the sulphuric acid concentration, the interference produced by ion nitrate, and the ion uraline and light influence are discussed. (Author) 36 refs.

  6. Quantitative elemental determination of the particulate matter in the atmosphere of Pachuca city and the Real del Monte village, Hidalgo by means of PIXE technique; Determinacion elemental cuantitativa de la materia particulada en la atmosfera de la ciudad de Pachuca y el poblado de Real del Monte, Hidalgo, mediante la tecnica PIXE

    Energy Technology Data Exchange (ETDEWEB)

    Guasso G, C.L. [ITT, 50000 Toluca (Mexico)

    2001-07-01

    All the pollutants that are generated so much of anthropogenic activities as natural cause effects to the health, and of course its increase the atmospheric pollution. Today in day for the great advance of the technology other pollutants are even generated but noxious to the human being's health, such it is the case of the particles, which are also called particulate matter airborne (MPA). This has motivated, to establish control measures leaning in collection strategies and certified analysis techniques, accurate and reliable. In the National Institute of Nuclear Research (ININ) they have been carried out studies on particulate matter airborne. In 1991 it was installed, calibrated and validated the nuclear technique of atomic origin based on proton beams known as PIXE. The characterization of the (MPA) it is carried out applying this technique and the collection by means of Dichotomous collectors (SFU). The thesis work that is presented next, includes the topic of the atmospheric pollution by particulate matter airborne (MPA) in a mining region, inside the Hidalgo State. The study was carried out during the 1998 winter season, only embracing the whole month of March in alternate days giving a total of 112 samples. Two sites that are highly active in the mining were studied, these are: the Real del Monte town and the Hidalgo state capital: Pachuca. Four samples per day were collected beginning to the 7:00 am--7:00 pm (daytime period) and concluding to the 7:00 pm -7:00 am (nocturne period). The characterization of its elementary content is carried out using the X-ray emission induced by particles technique (PIXE) that is a nuclear technique able to analyze 23 chemical elements beginning from the Al to the Pb, it requires of a very small sample quantity, it is very sensitive and it is not destructive. This characterization one carries out so much for fraction PM{sub 2.5} (fine) like as PM{sub 10} (thick) in both sites, also it was analyzed the temporary variation that the chemical elements detected in the samples present in the atmosphere and it was determined for each particle fraction the enrichment factor, all them during the daytime and nocturne periods. The document is removed in 5 topics, the topic I refers to the foundations, in them that is the MPA and the introduction to the PIXE technique is presented; the topic ll is the methodology used for the samples characterization, using the introduction of the technique and instrumentation of the same one, as well as the mathematical process for the determination of the concentrations of the detected elements, also approaches the analysis programs used for the concentration determination; the topic III, it presents the results discussion, the topic IV the conclusions and lastly the topic V it includes the recommendations with base to the obtained results, its are also presented the carried out consultations and the annexes for both sites, these last ones include charts of results, graphic of temporary variation, location map of the sites and enrichment factor graphics. (Author)

  7. Study of the analytic quality in the determinations of Cr, Fe, Mn, Cu, Zn, Pb and Hg through conventional and nuclear analytical techniques in mosses of the MATV; Estudio de la calidad analitica en las determinaciones de Cr, Fe, Mn, Cu, Zn, Pb y Hg a traves de tecnicas analiticas nucleares y convencionales en musgos de la ZMVT

    Energy Technology Data Exchange (ETDEWEB)

    Caballero S, B.

    2013-07-01

    To evaluate the environmental risks of air pollution and to facilitate the decision-making for control, is necessary to have the capacity to generate data with analytical quality. A comparison between nuclear (Neutron activation analysis and total reflection X-ray fluorescence spectrometry) and no nuclear analytical techniques (atomic absorption spectrometry and inductively coupled plasma optical emission spectrometry) for simultaneous determination of metal content (Cr, Cu, Fe, Hg, Mn, Pb and Zn) in mosses from Metropolitan Area of the Toluca Valley (MATV) was performed. Epiphytic mosses (Fabriona ciliaris and Leskea angustata) were sampled in two campaigns, 16 sites (urban, transition and natural) and were prepared for each technique. The biological certified reference materials were used for the quality control and to evaluate accuracy, precision, linearity, detection and quantification limits. Results show that nuclear analytical techniques and no nuclear applied in chemical analysis of Cr, Cu, Fe, Hg, Mn, Pb and Zn in moss from MATV are comparable and therefore all of these can potentially be used for this purpose. However, if its considered both, the performance parameters and economic/operational characteristics is widely recommended inductively coupled plasma optical emission spectrometry, conventional analytical technique, which showed the highest analytical grade quality. Also were observed spatial and temporal variations in the concentrations of Cr, Cu, Fe, Hg, Mn, Pb and Zn in mosses from MATV and was discussed its potential origin. The urban sites had the highest concentration of anthropogenic elements as Cr, Cu, Fe, Hg, Pb and Zn because are strongly impacted by roads with high vehicle traffic. (Author)

  8. Determination of the isotopic ratio {sup 234} U/{sup 238} U and {sup 235} U/{sup 238} U in uranium commercial reagents by alpha spectroscopy; Determinacion de la relacion isotopica {sup 234} U/{sup 238} U y {sup 235} U/{sup 238} U en reactivos comerciales de uranio por espectrometria alfa

    Energy Technology Data Exchange (ETDEWEB)

    Iturbe G, J.L

    1990-02-15

    In this work the determination of the isotope ratio {sup 234} U/{sup 238} U and {sup 235} U/{sup 238} U obtained by means of the alpha spectroscopy technique in uranium reagents of commercial marks is presented. The analyzed uranium reagents were: UO{sub 2} (*) nuclear purity, UO{sub 3} (*) poly-science, metallic uranium, uranyl nitrate and uranyl acetate Merck, uranyl acetate and uranyl nitrate Baker, uranyl nitrate (*) of the Refinement and Conversion Department of the ININ, uranyl acetate (*) Medi-Lab Sigma of Mexico and uranyl nitrate Em Science. The obtained results show that the reagents that are suitable with asterisk (*) are in radioactive balance among the one {sup 234} U/{sup 238} U, since the obtained value went near to the unit. In the case of the isotope ratio {sup 235} U/{sup 238} U the near value was also obtained the one that marks the literature that is to say 0.04347, what indicates that these reagents contain the isotope of {sup 235} U in the percentage found in the nature of 0.71%. The other reagents are in radioactive imbalance among the {sup 234} U/{sup 238} U, the found values fluctuated between 0.4187 and 0.1677, and for the quotient of activities {sup 235} U/{sup 238} U its were of 0.0226, and the lowest of 0.01084. Also in these reagents it was at the {sup 236} U as impurity. The isotope of {sup 236} U is an isotope produced artificially, for what is supposed that the reagents that are in radioactive imbalance were synthesized starting from irradiated fuel. (Author)

  9. Radioecological studies at the National Accelerator Centre based on the determination of {sup 1}29I by accelerator mass spectrometry (AMS); Estudios radioecologicos en el Centro Nacional de Aceleradores basados en la determinacion de {sup 1}29I mediante espectrometria de masas con acelerador (AMS)

    Energy Technology Data Exchange (ETDEWEB)

    Lopez-Gutierrez, J. M.; Gomez-Guzman, J. M.; Chamizo, E.; Santos, F. J.; Garcia-Leon, M.; Garcia-Tenorio, R.

    2013-07-01

    Since 2006 a compact system of mass spectrometry with Accelerator (AMS) is installed at the National Center of Accelerators, Seville. After an initial set-up and study have been opening many lines of research in fields such as archeology, geology, paleontology, oceanography, oceanography, internal dosimetry and characterization of radioactive waste, among others. In particular, based on the measurement of {sup 1}29I have made contributions to the field of radioecology and radiation protection. In this work they are summarized and presented some of these investigations. (Author)

  10. Identification of ftalates used as additives in the geo membrane of a la Florida reservoir through gas chromatography-mass spectrometry; Determinacion de las ftalatos utilizados como aditivos en la geomembrana de la bolsa de la florida mediante cromtografia de gases-espectrometria de masas

    Energy Technology Data Exchange (ETDEWEB)

    Blanco, M.; Rico, G.; Pargada, L.; Aguiar, E.; Castillo, F.

    2009-07-01

    This article studies the behaviour of the plastified poly (vinyl chloride) (PVC-P) applied as synthetic geo membrane for the waterproofing of the La Florida reservoir. We show the results of the initial examen of its properties and its most significant characteristics eighteen years after being applied. Furthermore we isolate and identify the quantitative and qualitative aspects of the plasticizers used in its formula through infrared spectroscopy, gas chromatography and mass spectrometry technic. We have identified as the said plasticizers di-n-octyl phthalate, di-n-decyl phthalate and n-decyl n-octyl phthalate, and we calculate the joint average molecular weight using Wilsons equation. The results found that the geo membranes we have studied has shown an excellent behaviour along through time. (Author) 53 refs.

  11. Study of New Analytical Methodologies for the Analysis of Polychlorinated Dibenzo-P-Dioxins (PCDDs) and Polychlorinated Di benzofurans (PCDFs) by Quadrupole Ion Storage Tandem-in-time Mass Spectrometry. Application to Environmental Samples; Estudio de nuevas metodologias analiticas en la determinacion de policlorodibenzo-P-dioxinas (PCDDs) y policlosrodibenzofuranos (PCDFs) por espectrometria de masas con trampa ionica. Aplicacion a muestras medioambientales

    Energy Technology Data Exchange (ETDEWEB)

    Sanz Chichon, M. P.

    2008-07-01

    Two alternative analytical methodologies have been developed for the analysis of polychlorinated dibenzo-p-dioxins (PCDDs) and di benzofurans (PCDFs) in environmental samples. The techniques studied have been: Pressurized Fluid Extraction (PFE) and Microwave-Assisted Extraction (MAE) versus Soxhlet extraction; the automated system Power-PrepTM versus the conventional cleanup using open chromatographic columns with different adsorbents and the application of tandem mass spectrometry (HRGC-MS/MS) versus high resolution mass spectrometry (HRGC-HRMS) for PCDD/Fs detection and quantification. (Author) 233 refs.

  12. Determination of the zero in the Two theta angle and the wavelength in the neutron diffractometer for the Cyber computer of the ININ and for the IBM compatible microcomputers; Determinacion del cero en el angulo Dos teta y la longitud de onda en el difractometro de neutrones para la computadora Cyber del ININ y para microcomputadoras compatibles con IBM

    Energy Technology Data Exchange (ETDEWEB)

    Macias B, L.R

    1991-05-15

    The objective of this work consists on determining the calibration in the angular parameters and the neutron wavelength used in the neutron diffractometer of the TRIGA Mark III reactor, through some readings in that a well-known sample is used by means of a Fortran computer program that is used in the CYBER computer of the ININ in Mexico, and/or in micro computers compatible with IBM. The program was also designed to determine the zero of the 2 {theta} angle of the goniometer of the diffractometer. The generated data were proven by means of well-known data of the Powder Diffraction File of the Joint Committee on Powder Diffraction Standards (JCPDS). (Author)

  13. Multi-elemental analysis of atmospheric pollutants and determination of particle size using the PIXE method, a cascade impactor and a filter unit constructed in Mexico; Analisis multielemental de contaminantes atmosfericos y determinacion de tamano de particula utilizando el metodo PIXE, un impactor de cascada y una unidad de filtro construidos en Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Aldape U, F. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    1989-01-15

    This work presents: 1) The methodology and the experimental conditions of the PIXE technique so that it is used as a better option inside the analytical methods in aerosols studies, 2) The development, tests and applications of a cascade impactor of the Batelle type built to determine particle size to use it jointly with the mentioned technique in the determination of the elements concentration according to its size.By this way is fulfilled with the first goal of this extensive project. (Author)

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

    Energy Technology Data Exchange (ETDEWEB)

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

    2005-07-01

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

  15. Determination of experimental conditions for the analysis of rare-earth elements by X-ray fluorescence spectrometry. Application to oxalates and potassium sulphate matrices; Establecimiento de varibles experimentales para la determinacion de tierras raras por espectrometria de fluorescencia de rayos X. Aplicacion a los concentrados de oxalatos y sulfatos

    Energy Technology Data Exchange (ETDEWEB)

    Bayon Fuentes, A.; Bermudez Polonio, J.

    1969-07-01

    A previous theoretical and experimental study is carried out in order to analyze the rare earths elements by X-ray florescence spectrometry. All possible spectral interferences are considered. The working conditions for each element were selected, taking into account the peak/background ratio values for the following parameters: tungsten, molybdenum and chromium targets, current and voltage, analyzing crystals, and scintillation and flow proportional counters. Calibration curves were plotted showing the concentration of rare earths elements in oxalates and potassium sulphate matrices, and the theoretical detection limits for each element: are calculated. (Author) 8 refs.

  16. Determination of the dose equivalent Hp(0.07) in hands of occupationally exposed personnel in the practice of proton emission tomography (PET/CT); Determinacion de la dosis equivalente Hp(0.07) en manos de trabajadores ocupacionalmente expuestos en la practica de Tomografia por Emision de Positrones (PET/CT)

    Energy Technology Data Exchange (ETDEWEB)

    Lea, D. [Servicio de Radiofisica Sanitaria, Unidad de Tecnologia Nuclear, Instituto Venezolano de Investigaciones Cientificas, Ministerio de Ciencia y Tecnologia, Km 11 Carretera Panamerican, Altos del Pipe, Caracas (Venezuela); Ruiz, N.; Esteves, L. [Centro Diagnostico Docente Las Mercedes, Calle Paris cruce con calle Caroni, Edif. CDD, Las Mercedes, Caracas (Venezuela)]. e-mail: dlea@ivic.ve

    2006-07-01

    In Venezuela recently it was implanted the Positron Emission Tomography technique (PET) with the perspective of implanting it at national level. Even when in our country practices it of nuclear medicine it exists from early of 70, there is not experience in the determination of the occupational doses by exposure to the external radiation in hands. By this reason, a concern exists in the workers of the centers of nuclear medicine where it is practiced the Positron Emission Tomography technique. In absence of the TLD dosimetry to measure dose in hands in our country, measurements of the dose equivalent of the workers of the PET national reference center were made, using a detector of hands type diode. It was determined the dose in hands in terms of dose equivalent Hp(0.07) in two work positions, that is: the corresponding to the transfer of the receiving vial of ({sup 18}F) FDG to the shield, quality control and uni doses division. The second work position corresponds the person in charge of administering, via intravenous, the ({sup 18}F) FDG. In this work it realizes the dose equivalent in hands Hp(0.07) measures in each one of the work positions before described by daily production. The informed doses correspond to a total average produced activity of 20.4 GBq (550 mCi). The results of the measurements in terms of dose equivalent in hands Hp(0.07) correspond to 2.1 {+-} 20% mSv in the work position of division and 0.4 {+-} 10% mSv in the position of injection of the radioactive material. At short term this foreseen until 4 productions per week, what means an annual dose equivalent Hp(0.07) in hands of 400 mSv approximately, without taking into account abnormal situations as its are spills of the ({sup 18}F) FDG in the work place. This work is the starting point so that the regulatory authority settles down, in Venezuela, dose restrictions in the PET practices and implant, in the centers of nuclear medicine, an optimization politics of this practice in conformity with the ALARA principle. (Author)

  17. Importance of salt in the production matrix of the efficiency curve for the determination of the total alpha activity in water samples; Importancia de la matriz salina en la fabricacion de la curva de eficiencia para la determinacion del indice de actividad alfa total en muestras de agua

    Energy Technology Data Exchange (ETDEWEB)

    Baeza, A.; Corbacho, J. A.

    2011-07-01

    The determination of total alpha activity by the evaporation method allows obtaining, from a quick and inexpensive technique, the order of magnitude of the total activity of all alpha emitters present in a sample of water. This study shows that the detection efficiency curve varies significantly depending on the sodium salt is used to manufacture calibration and/or reference radionuclide used. (Author)

  18. Determination of the archaeological origin of ceramic fragments characterized by neutron activation analysis, by means of the application of multivariable statistical analysis techniques;Determinacion del origen de fragmentos de ceramica arqueologica caracterizados con analisis por activacion neutronica, mediante la aplicacion de tecnicas de analisis estadistico multivariable

    Energy Technology Data Exchange (ETDEWEB)

    Almazan T, M. G.; Jimenez R, M.; Monroy G, F.; Tenorio, D. [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico); Rodriguez G, N. L. [Instituto Mexiquense de Cultura, Subdireccion de Restauracion y Conservacion, Hidalgo poniente No. 1013, 50080 Toluca, Estado de Mexico (Mexico)

    2009-07-01

    The elementary composition of archaeological ceramic fragments obtained during the explorations in San Miguel Ixtapan, Mexico State, was determined by the neutron activation analysis technique. The samples irradiation was realized in the research reactor TRIGA Mark III with a neutrons flow of 1centre dot10{sup 13}ncentre dotcm{sup -2}centre dots{sup -1}. The irradiation time was of 2 hours. Previous to the acquisition of the gamma rays spectrum the samples were allowed to decay from 12 to 14 days. The analyzed elements were: Nd, Ce, Lu, Eu, Yb, Pa(Th), Tb, La, Cr, Hf, Sc, Co, Fe, Cs, Rb. The statistical treatment of the data, consistent in the group analysis and the main components analysis allowed to identify three different origins of the archaeological ceramic, designated as: local, foreign and regional. (Author)

  19. Measurement of the mass of mercury in electrolytic cells of Chemical Industry of the Istmo s. a. of c. v. Coatzacoalcos Plant, Ver. (Mexico); Determinacion de la masa de mercurio en celdas electroliticas de Industria Quimica del Istmo s. a. de c. v. Planta Coatzacoalcos, Ver

    Energy Technology Data Exchange (ETDEWEB)

    Angeles C, A.; Vizuet G, J.; Herrera M, J. M.; Flores M, J

    2001-01-15

    For the industry of the production of caustic soda and chlorine is commonly use electrolytic cells with mobile electrode of mercury; in the process it gets lost mass, and there is necessity to know the quantity of mercury that exists in each cell. To know the periodic levels of mercury in the 40 electrolytic cells of the Plant of Coatzacoalcos, in the State of Veracruz (Mexico), the investigators of the ININ used the technique of isotopic dilution by mean of the radioactive injection of a radioactive tracer.(Author)

  20. CFD simulation in emptying tanks for calculating submergence in the case of storage tanks, the CFD simulation is based on the modeling of the suction nozzle which affects the study and final part of the storage tank; Aplicacion de simulacion CFD en el analisis del vaciado de tanques de almacenamiento para determinacion del nivel de sumergencia

    Energy Technology Data Exchange (ETDEWEB)

    Arranz Iglesias, J.; Gavilan Moreno, C.; Sarti Fernandez, F.

    2014-07-01

    The study consists in simulating the emptying of the tank when the water level is near the level of the suction nozzle. The objective pursued is to detect the harmful phenomena that may occur in aspiration, ranging from the appearance of vortices and bubble formation to excessive fluid accelerations. (Author)

  1. Experimental aspects of stress-strain curves determination at high temperature and controlled atmosphere: Al{sub 2}O{sub 3}-MgO-C refractories; Aspectos experimentales de la determinacion de curvas esfuerzo-deformacion a alta temperatura y en atmosfera controlada: Refractarios Al{sub 2}O{sub 3}-MgO-C

    Energy Technology Data Exchange (ETDEWEB)

    Munoz, V.; Rohr, G. A.; Tomba Martinez, A. G.; Cavalieri, A. L.

    2011-07-01

    A methodology for the mechanical evaluation of refractory materials at high temperatures and controlled atmosphere, designed and implemented in the Structural Materials Laboratory of Ceramics Division of INTEMA, is described. The methodology includes the measurement of the specimen deformation by contact extensometry in compression tests to obtain stress-strain curves and the use of a gaseous flow as a system to control atmosphere. The determination of stress-strain curves of Al{sub 2}O{sub 3}-MgO-C commercial refractories used in steelmaking ladles at room temperature and 1260 degree centigrade in different atmospheres is presented as an example of application of this methodology. (Author) 34 refs.

  2. Combinación de sistemas de flujo de baja y alta presion para la determinacion de Mg, Ca y Sr en salmueras por espectrofotometria de absorcion atomica con llama Combination of low- and high-pressure flow systems for the determination of Mg, Ca and Sr in brines by flame atomic absorption spectrometry

    Directory of Open Access Journals (Sweden)

    José Neira

    2001-04-01

    Full Text Available This article describes the combination of low- and high-pressure flow systems for the determination of Magnesium, Calcium and Strontium by flame atomic absorption spectrometry (FAAS. In the low-pressure system a short C-18 RP column (length 0,5 cm was utilized for the preconcentration/matrix separation step, xylenol orange was used as chelating agent and tetrabutylamonium acetate for ion pair formation. The hydraulic high pressure nebulization (HHPN was used for sample transport and sample introduction in the high pressure system. The repeatabilities and detection limits for Mg, Ca and Sr were determined and compared with those obtained by pneumatic nebulization (PN. The results show that the detection limits obtained using the HHPN for Mg, Ca and Sr are between 1.5 to 2 times better than those obtained by PN when the signal transient was measured in area. The system presented a sampling frequency of 130 h-1 for direct determination of Mg, Ca or Sr in samples of saturated sodium chloride used in the production of chlorine and sodium hydroxide.

  3. Validation of the methodology for determining As, Sb, Hg, and Se in the water supply in Tudela, Navarra, spain, by atomic absorption; Validacion de la metodologia para la determinacion de As, Sb, Hg, y Se en aguas de abastecimiento a Tudela (Navarra) por absorcion atomica

    Energy Technology Data Exchange (ETDEWEB)

    Gale, M. A.; Cebrian, N.; Ormad, P.; Ovelleiro, J. L.

    2002-07-01

    In compliance with the current regulations on water quality, an analytical methodology has been put in place in the laboratory of the waste water treatment plant in Tudela, Navarre (Spain) to monitor As, Sb, Hg, and Se in the water going into the public water supply. The technique used to monitor these elements is atomic absorption spectrometry, As, Sb, Se are determined by the generation of hydrides and Hg by the generation of cold vapour. In addition, in order to ensure the authenticity of the results, the methodology employed has been validated by a study of the following technical characteristics: linearity, work interval, sensitivity, precision and accuracy. Extremely satisfactory results were obtained in all cases. A linear range between 0 and 1000 mg/l for all four elements and extremely low detection and quantification limits (less than 1 mg/l) were found. In the study of the method's accuracy, the C. V. s were below the legally established minima and the method was found to be very accurate. (Author) 18 refs.

  4. [Assessment of therapeutic passive hypothermia in newborns with hypoxic-ischemic encephalopathy that need interhospital transport].

    Science.gov (United States)

    Fuentes-Ruiz, José A; Lagares-Franco, Carolina; Rodríguez-Molina, Óscar; Cordero-Cañas, Enrique; Benavente-Fernández, Isabel

    2015-04-01

    Introduccion. La hipotermia inducida durante las primeras horas de vida del recien nacido es un tratamiento eficaz para reducir la mortalidad y secuelas graves en neonatos que han sufrido un episodio de hipoxia perinatal. Este procedimiento requiere una asistencia universalizada independiente del centro donde haya nacido, siendo necesario su traslado al hospital de referencia. Objetivo. Evaluar la eficacia del traslado interhospitalario del neonato con encefalopatia hipoxico-isquemica en hipotermia pasiva. Pacientes y metodos. Estudio descriptivo de series de casos con caracter retrospectivo. Se estudiaron neonatos de la provincia de Cadiz que precisaron hipotermia inducida. Se incluyo a un total de 46 neonatos en el analisis: 33 de ellos (71,74%) precisaron traslado por el Servicio de Traslados de Pacientes Criticos (grupo TPC); el resto (28,26%) nacio en el centro de referencia. Resultados. Ambos grupos son comparables en edad gestacional al nacimiento, sexo, peso y grado de encefalopatia hipoxico-isquemica. Se analizan variables relacionadas con la aplicacion de la hipotermia, y en el grupo TPC se analizan variables relacionadas con el traslado. No se aprecian diferencias significativas entre los grupos en la efectividad-consecuencia de la terapia neuroprotectora con hipotermia al alta hospitalaria (p = 0,159). No se encuentran complicaciones derivadas del traslado interhospitalario. Conclusiones. El traslado interhospitalario del neonato en hipotermia terapeutica realizado de forma pasiva es efectivo, seguro y necesario para el cumplimiento de la terapia. Es preciso consensuar la asistencia con el servicio de referencia, estableciendo guias en cuanto al soporte y rango de temperatura adecuada, consolidando asi una asistencia integral.

  5. Análisis de la utilidad de la olfatogustometría mediante BAST-24 en la población diabética y su relación con la función renal

    OpenAIRE

    Gascón Rubio, María Cristina

    2014-01-01

    157 p. : il., graf. Realizamos un estudio descriptivo observacional del sentido del olfato mediante el test BAST-24 de la población diabética. Valoramos su función renal mediante determinaciones analíticas.

  6. Plan regulador comunal como herramienta de gestión para una ciudad intermedia. Los Ángeles

    Directory of Open Access Journals (Sweden)

    Mauricio Carrasco Carrasco

    2015-03-01

    La puesta en marcha de este instrumento de ordenación territorial, coincide con una etapa de gran dinamismo en el mercado inmobiliario de la ciudad, lo que ha permitido evaluar el comportamiento de las determinaciones del plan, validando los criterios de base del mismo y evidenciando los aspectos que se requiere modificar para el perfeccionamiento del instrumento.

  7. Técnica de Análisis por Activación

    OpenAIRE

    Chanto A., Víctor H.; Gallardo Z., Muricio

    2015-01-01

    El análisis por activación es una tecnica analitica, de gran sensibilidad en la determinacion de elementos a bajas concentraciones (del orden de los nanogramos), la cual tiene aplicacion en todos los campos donde las impurezas tiene algún significado especial; de aqui su importancia en metalurgia, geologia, fisica, quimica, ciencias medicas y biologicas.

  8. [Complex Congenital Heart Disease: The Influence of Prenatal Diagnosis].

    Science.gov (United States)

    Correia, Marta; Fortunato, Fabiana; Martins, Duarte; Teixeira, Ana; Nogueira, Graça; Menezes, Isabel; Anjos, Rui

    2015-01-01

    Introdução: As cardiopatias congénitas complexas são patologias graves, e o diagnóstico pré-natal poderá ter implicações sobre a morbilidade e a mortalidade. O objetivo deste trabalho foi estudar a influência do diagnóstico pré-natal e da distância do local de parto a um centro de referência, na morbilidade imediata e mortalidade precoce de um grupo de doentes com cardiopatias congénitas complexas.Material e Métodos: Análise retrospetiva dos doentes com cardiopatias congénitas complexas, seguidos no nosso hospital, nascidos entre 2007 e 2012.Resultados: Identificaram-se 126 doentes com cardiopatias congénitas complexas. Em 95% a gravidez foi vigiada desde o primeiro trimestre existindo diagnóstico pré-natal em 42%. Houve relação estatisticamente significativa entre o local do parto e a existência de diagnóstico pré-natal. A cardiopatia congénita complexa mais frequente foi a transposição das grandes artérias (45,2%), seguida da atresia da pulmonar com comunicação interventricular (17,5%) e ventrículo esquerdo hipoplásico (9,5%). Oitenta e dois doentes (65,1%) foram medicados com prostaglandinas e 38 (30,2%) foram ventilados antes de uma intervenção. A cirurgia ocorreu no período neonatal em 73%. A sobrevida atuarial aos 30 dias, 12 e 24 meses foi 85%, 80% e 75%, respetivamente. Não houve relação estatisticamente significativa entre diagnóstico pré-natal e mortalidade.Discussão: A maioria dos doentes com cardiopatias congénitas complexas não teve diagnóstico pré-natal. Nos casos com diagnóstico pré-natal houve referenciação e parto num centro terciário. Não houve associação estatisticamente significativa entre diagnóstico prénatal e mortalidade neonatal, como já descrito em séries heterogéneas de cardiopatia congénita complexa.Conclusão: A maioria dos doentes com cardiopatias congénitas complexas não teve diagnóstico pré-natal. Estes dados devem ser tomados em conta no planeamento do diagnóstico pr

  9. Doenças periodontais em pacientes com doença isquêmica coronariana aterosclerótica, em Hospital Universitário Periodontal disease in patients with ischemic coronary atherosclerosis at a University Hospital

    Directory of Open Access Journals (Sweden)

    Ana Lúcia Azevedo Barilli

    2006-12-01

    Full Text Available OBJETIVO: Verificar a freqüência das doenças periodontais (DP em pacientes com cardiopatia isquêmica. As DP representam grave problema de saúde pública odontológica, com distribuições diferenciadas quanto a gravidade, faixa etária, tipo de infecção, comorbidades e fatores de risco. MÉTODOS: Foram examinados 480 pacientes no Ambulatório de Cardiopatia Isquêmica do Hospital das Clínicas da Faculdade de Medicina de Ribeirão Preto da Universidade de São Paulo, e 154 pacientes sem cardiopatia na mesma instituição. Preencheram os critérios de inclusão para a investigação periodontal, respectivamente, 58 e 62 pacientes, de trinta a 79 anos. Foram utilizados o Índice Periodontal Comunitário (IPC e o Índice de Perda de Inserção Periodontal (PIP, recomendados pela OMS (1999. RESULTADOS: Houve predomínio de sextantes com DP moderada e grave nos pacientes com cardiopatia (76,3% versus 20,2%; p 6 mm, 79,3% dos pacientes com cardiopatia contra 9,7% dos sem cardiopatia (p OBJECTIVE: To verify the prevalence of periodontal disease (PD in patients with ischemic heart disease. PD is a serious public dental health care problem with a differentiated distribution in regards to severity, age group, type of infection, co-morbidities and risk factors. METHODS: Four hundred and eighty patients were examined at the Ischemic Cardiopathy Outpatient Clinic of the Hospital das Clínicas of the Ribeirão Preto Medical School, São Paulo University, as well as 154 patients without heart disease from the same institution. Fifty-eight patients with heart disease and 62 patients without heart disease between the ages of 30 and 79 met the criteria to be included in the investigation. In accordance with recommendations of WHO (1999 the Community Periodontal Index (CPI and the Periodontal Attachment Loss Index (PALI were used. RESULTS: Patients with heart disease had a prevalence of sextants with moderate to advanced PD (76.3% versus 20.2%; p 6 mm was

  10. Dosagem intra-eritrocitária e plasmática de água, sódio e potássio em crianças submetidas a cirurgia cardíaca

    OpenAIRE

    Wanderley, Jeferson Puppi

    2013-01-01

    Resumo: Foram estudadas 28 crianças portadoras de cardiopatias congênitas e 3 crianças portadoras de cardiopatias adquiridas, das quais 18 foram submetidas a circulação extracorpórea e 13 não necessitaram deste procedimento durante o ato cirúrgico. Os pacientes foram avaliados durante os períodos pré-operatório, pós-operatório imediato e após 24, 48 e 72 horas do término da cirurgia, procedendo-se às dosagens de água, sódio e potássio intra-eritrocitários e plasmãticos, investigando-se as rel...

  11. [XIII Congresso Societa' Italiana di Cardiologia 1956, in Trieste and the birth of cardionephrology].

    Science.gov (United States)

    Timio, M

    2007-01-01

    The Author comes recently across the proceedings volume of the forgotten XVIII Congress of the ''Società Italiana di Cardiologia'' held in Trieste on May 1956. The proceedings focus on the ''cardiopatia renale'', i.e. the heart lesion observed in Kidney disease, namely in acute glomerulonephritis. Later ''Cardiopatia renale'' changes into ''uremic cardiomyopathy'' but the terms seem uncorrect as they do not include the cardiac derangement in early stages of nephropathies. The diction ''cardiomyopaty'' in uremic seems more complete. The topic becomes very ''hot'' and the kidney- heart scientific culture grows more and more and culminates with the ''Cardionephrology'' term coined in 1991 at Assisi Meeting and then wide spread all over Europe.

  12. Determination of the correction factor for attenuation, dispersion and production of electrons (K{sub wall}) in the wall of graphite of a ionization chamber Pattern National Type CC01 in fields of gamma radiation of {sup 60}Co; Determinacion del factor de correccion por atenuacion, dispersion y produccion de electrones (K{sub wall}) en la pared de grafito de una Camara de Ionizacion Patron Nacional Tipo CC01 en campos de radiacion gamma de {sup 60} Co

    Energy Technology Data Exchange (ETDEWEB)

    Alvarez R, J.T.; Morales P, J.; Cruz E, P. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    2001-12-15

    It was determined the Kwall correction factor for the wall of graphite of the chamber of the pattern national type CC01 series 133 for a radiation field Gamma of {sup 60}Co. With this end to measured the currents of ionization l(x) as function of the thickness of the wall of the chamber: X=4,8,12,16 and 20 mm.The mensurations for each thickness consisting of three groups, of sizes n = 30 or 60 data for each group; obtaining 8 complete groups of mensurations independent in eight different dates.The determinate the factor carried out using three regression models: lineal, logarithmic and quadratic, models that were tried to validate with the tests of : i) Shapiro-Wilk and {chi}{sup 2} for the normality of the entrance data ii) Tests of Bartlett for variances homogeneity among groups for each thickness iii) The tests of Duncan for the stockings among groups of each thickness, and iv) The tests of adjustment lack (LOF) for the models used. Nevertheless, alone the models of the group of corresponding mensurations at 01-03-2000 17-08-2001 they can be validated by LOF, but not for tests of normality and homogeneity of variances. Among other assignable causes of variation we have: i) The values captured by the system of mensuration of the variables of it influences: pressure, temperature and relative humidity don{sup t} belong together with the existent ones to the moment to capture the l(x). ii) The mensuration room presents flows of air, for what was suited o diminish their volume and to eliminate the flows of air. iii) A protocol settled down of taking of measures that it consisted in: - Pre-irradiation 5 minutes the chamber after the change of polarity and hood change, with a period of stabilization of 5 minutes after the pre-irradiation. - Pre-irradiation for 5 minutes before the taking of the readings, with the object of eliminating variation sources assigned to currents of escapes or due variations to transitory. iv) To realize corrections for relative humidity of agreement with the reference, [13). Nevertheless, our values of Kwall = 1.1035 {sub +} 0.08% and those reported by the manufacturer (Kwall=1.0136), both fixeds with a lineal model, defer a maximum of 0.1%. (Author)

  13. Determination of differences in the left ventricular ejection fraction (LVEF) by radionuclides and echocardiography pre and post treatment with anthracycline in pediatric patients with oncology diagnostic of the La Raza Medical Center; Determinacion de diferencias en la fraccion de eyeccion del ventriculo izquierdo (FEVI) por radionuclidos y ecocardiografia pre y post tratamiento con antraciclinas en pacientes pediatricos con diagnostico oncologico del Centro Medico La Raza

    Energy Technology Data Exchange (ETDEWEB)

    Veras R, H

    2003-07-01

    The objective of this work was to correlate the left ventricular ejection fraction determine by radionuclide angiocardiography and echocardiography in pediatric patients under anthracycline treatment. Material and methods: 41 patients were studied with range age from 3 to 14 years, with oncology diagnostic that were treated with anthracycline. Radionuclide angiocardiography and echocardiography were performed before an after anthracycline administration to determine the changes in the Ieft ventricular ejection fraction. Results: Anthracycline treatment caused no changes in the electrocardiography, echocardiogram and radionuclide angiocardiography. Conclusions: In our study anthracycline treatment caused no changes in the electrocardiography, echocardiography and both radionuclide angiocardiography techniques, first-pass and equilibrium. A high correlation was obtaining when left ventricular ejection fraction is compared between radionuclide angiocardiography and echocardiogram. (Author)

  14. Determination of the constants of the solubility product of Ln(OH){sub 3} and the effect of the chloride ions on the lanthanum hydrolysis, praseodymium and lutetium in aqueous solutions of ion force 2 Molar; Determinacion de las constantes del producto de solubilidad de Ln(OH){sub 3} y el efecto de los iones cloruro sobre la hidrolisis de lantano, praseodimio y lutecio en soluciones acuosas de fuerza ionica 2 Molar

    Energy Technology Data Exchange (ETDEWEB)

    Lopez G, H.D

    2005-07-01

    The behavior of lanthanum (III), praseodymium (III), and lutetium (III) was studied in 2 M NaClO{sub 4} (aq) and 2 M NaCl (aq) at 303 K and free -CO{sub 2} conditions. Solubility diagrams (p Ln(aq)-pC{sub H}) were obtained by means of a radiochemical method. The pC{sub H} borderlines of saturation and unsaturation zones of the solutions and solubility product constants for Ln(OH){sub 3} were determined from these diagrams. The fitting of the solubility equation to the experimental values of p Ln(aq)-pC{sub H} diagrams allowed the calculation of the first hydrolysis and solubility product constants. Independently, the stability constants for the first species of hydrolysis were determined by means of pH titrations, the data were treated with the program SUPERQUAD and fitted to the mean ligand number equation. The stability constants for the species LnCl{sup 2+} were as well calculated in 2M ionic strength and 303 K from the hydrolysis constant values obtained in both perchlorate and chloride media. The values obtained for La, Pr and Lu were: logK{sub ps}: 21.11 {+-} 0.09, 19.81 {+-} 0.11 and 18.10 {+-} 0.13 in 2M NaClO{sub 4}; logK{sub ps}: 22.22 {+-} 0.09, 21.45 {+-} 0.14 and 18.52 {+-} 0.29 in 2M NaCl; log {beta}{sub 1}: - 8.64 {+-} 0.02, - 8.37 {+-} 0.01 and - 7.95 {+-} 0.11 in 2M NaClO{sub 4}; log {beta}{sub 1}{sup /} : - 9.02 {+-} 0.11, - 8.75 {+-} 0.01 and - 8.12 {+-} 0.03 in 2M NaCl and the values for log {beta}{sub 1,Cl} were - 0.0255, - 0.155 and - 0.758, respectively. (Author)

  15. Estenose aórtica supravalvar em adulto com anomalia de vasos da base e insuficiência aórtica

    Directory of Open Access Journals (Sweden)

    Acrisio Sales Valente

    2013-12-01

    Full Text Available A estenose aórtica supravalvar é uma rara cardiopatia congênita, bastante incomum em adultos. Apresentamos um caso de estenose aórtica supravalvar em adulto com anomalia de vasos do arco aórtico, já com presença de insuficiência aórtica importante, tratado com êxito por meio de plastia da aorta ascendente e troca valvar aórtica.

  16. Estenose aórtica supravalvar em adulto com anomalia de vasos da base e insuficiência aórtica

    OpenAIRE

    Acrisio Sales Valente; Polyanna Alencar; Alana Neiva Santos; Roberto Augusto de Mesquita Lobo; Fernando Antônio de Mesquita; Aloyra Guedis Guimarães

    2013-01-01

    A estenose aórtica supravalvar é uma rara cardiopatia congênita, bastante incomum em adultos. Apresentamos um caso de estenose aórtica supravalvar em adulto com anomalia de vasos do arco aórtico, já com presença de insuficiência aórtica importante, tratado com êxito por meio de plastia da aorta ascendente e troca valvar aórtica.

  17. Determinación simultánea de metales con el ácido dietilenotriaminopentaacético (ADTP) por espectrofotometría derivada

    OpenAIRE

    Pérez Iglesias, Julia

    2011-01-01

    [Resumen] SE REALIZO UN ESTUDIO BIBLIOGRAFICO ACERCA DEL USO DEL ACIDO DIETILENOTRIAMINOPENTAACETICO (ADTP) COMO AGENTE QUELATANTE, DESDE SU PRIMERA UTILIZACION POR WANNINEN EN 1975.SE HACE UNA INTRODUCCION TEORICA A LA ESPECTROFOTOMETRIA DE DERIVADAS DE PRIMER Y SEGUNDO ORDEN, ANALIZANDO SUS METODOS, VENTAJAS Y PRINCIPALES APLICACIONES, INCIDIENDO ESPECIALMENTE SOBRE SU APLICACION A LAS DETERMINACIONES SIMULTANEAS DE DIFERENTES CATIONES METALICOS EN SUS MEZCLAS.SE PROPONEN LOS PROCED...

  18. Caracterización y estudio de ácidos arildentiobarbitúricos formados por reacción entre el ácido 2-tiobarbitúrico (atb) y aldehídos aromáticos

    OpenAIRE

    Guillén Sanz, Remedios

    1986-01-01

    En esta memoria se ha realizado un estudio de la reaccion acido 2-tiobarbiturico-aldehido a traves de la sintesis de los derivados: acido 5-(anisiliden)-2-tiobarbiturico acido 5-(p-dimetilaminobenciliden)-2-tiobarbiturico y acido 5-(saliciliden)bis-2-tiobarbiturico. Este estudio comprende la preparacion de los tiobarbituricos su caracterizacion espectral estabilidad y determinacion de constantes fisico-quimicas importantes (pka coeficiente de particion en distintos sistemas disolventes pa...

  19. THE PHYSICAL PROPERTIES OF RED SUPERGIANTS

    Directory of Open Access Journals (Sweden)

    P. Massey

    2008-01-01

    Full Text Available La ubicación "observada" de supergigantes rojas en el diagrama HR ha estado variando con los modelos evolutivos a lo largo de los años, pero la nueva generación de modelos de atmósferas estelares MARCS ha conducido a mejores determinaciones de sus propiedades físicas y un mejor acuerdo con la teoría de evolución estelar. Resumimos brevemente nuestros descubrimientos.

  20. Construcción de la ciudad y planeamiento urbano

    OpenAIRE

    Luque-Valdivia, J. (José)

    2001-01-01

    El libro, a modo de manual básico, introduce en la práctica del planeamiento urbano desde el punto de vista del arquitecto. Con este objetivo se caracteriza la gestión urbanística como el procedimiento a través del cual se construye la ciudad; procedimiento que ha de tenerse en cuenta al decidir la ordenación urbana y establecer la determinaciones del planeamiento

  1. Mineralización de los fertilizantes orgánicos, sirle y turba.

    OpenAIRE

    Reverte Navarro, Pablo; Costa Yagüe, Francisco

    1980-01-01

    En el trabajo que se ha llevado a cabo nos ha interesado conocer algunos aspectos del comportamiento de dos tipos de fertilizantes orgánicos, sirle y turba, cuando sufren un período de descomposición en el suelo. Para intentar cumplir los fines propuestos en esta experiencia, se han realizado diversas determinaciones químicas y microbiológicas.

  2. El ensayo del ácido 2-tiobarbitúrico (atb) para medir la degradación autooxidativa de aceites vegetales comestibles

    OpenAIRE

    Vicario Romero, Isabel María

    1993-01-01

    En esta memoria se lleva a cabo un estudio general sobre el ensayo del acido 2-tiobarbiturico (atb) y su aplicacion a la determinacion de la degradacion autooxidativa de aceites vegetales comestibles. la recopilacion de todo el material cientifico disponible sobre este ensayo hasta el presente nos permite conocer las caracteristicas de la reaccion y su importancia en la valoracion de la degradacion autooxidativa de alimentos y otros sistemas biologicos, asi como las tecnicas empleadas y las a...

  3. [Cervical ischaemic neuronopathy and cardioembolism: another cause of man-in-the-barrel syndrome].

    Science.gov (United States)

    Gonzalez-Usigli, H; Gandarilla, A; Garcia, J J; Serrato, J; Estrada, N

    2016-12-16

    Introduccion. Los infartos de la medula espinal ocurren aproximadamente en el 1% de todos los infartos del sistema nervioso. El cardioembolismo es una causa rara. Las areas comunmente afectadas en infartos medulares son zonas de circulacion limitrofe en la region dorsal o lumbar; sin embargo, se han descrito previamente infartos medulares en la zona cervical asociados a la diseccion de arterias vertebrales. Caso clinico. Se presenta un nuevo caso de sindrome del hombre en el barril asociado con fibrilacion auricular durante un infarto agudo de miocardio, que causo una neuronopatia cervical isquemica (infarto de astas anteriores). Conclusiones. Los hallazgos clasicos de isquemia medular cervical son tetraplejia aguda, disfuncion vesical, intestinal y cardiovascular, asi como perdida de la sensibilidad disociada. La colateralizacion incompleta y las caracteristicas anatomicas de la arteria espinal anterior en la medula cervical hacen de la porcion C3-C5 la region mas vulnerable de daño isquemico, ya que la irrigacion de las arterias radiculares se inicia debajo de C5 y la fisiopatologia de la lisis rapida de un coagulo fresco produce unicamente daño bilateral de las celulas de las astas neuronales.

  4. [Acute optic neuropathy: differential diagnoses].

    Science.gov (United States)

    Buompadre, María Celeste

    2013-09-06

    Introduccion. La alteracion funcional del nervio optico se caracteriza por un deficit en la agudeza visual, en la vision cromatica y en el campo visual, defecto pupilar aferente y, en algunos casos, edema del nervio o atrofia y palidez. Objetivo. Describir el espectro de neuropatias opticas agudas, su clinica, diagnostico y tratamiento, con mayor interes en aquellas de presentacion en la edad pediatrica. Desarrollo. La neuritis optica puede ser monofasica, recurrente o el componente de un cuadro desmielinizante polisintomatico. El objetivo del tratamiento es reducir el numero y la gravedad de los ataques y prevenir discapacidad. La infecciosa es secundaria a diferentes microorganismos (bacterias, virus, hongos y protozoos). El tratamiento depende de la etiologia. La isquemica anterior no arteritica o idiopatica es la forma mas frecuente y es secundaria a enfermedad de pequeños vasos (ciliares posteriores). La neuropatia optica hereditaria o de Leber representa una causa importante de afectacion visual cronica y se caracteriza por la afectacion selectiva de las celulas ganglionares de la retina. Hasta el momento, la terapia solo es de apoyo. En el papiledema asociado a hipertension endocraneal, la agudeza visual generalmente se conserva pero existe aumento de la mancha ciega. El tratamiento se basa en disminuir la hipertension y el factor etiologico si existe. Conclusiones. Las neuropatias opticas agudas constituyen un amplio grupo de entidades, de etiologia diversa y con un pronostico visual variable. La presencia de signos del examen neurologico, fondo de ojo y neuroimagenes pueden orientar hacia el diagnostico y tratamiento oportuno.

  5. O eletrocardiograma de alta resolução no domínio da freqüência. Utilização de técnicas estatísticas de correlação espectral para identificação de pacientes com taquicardia ventricular monomórfica sustentada

    Directory of Open Access Journals (Sweden)

    Barbosa Eduardo Corrêa

    1998-01-01

    Full Text Available OBJETIVO: Avaliar uma melhoria da acurácia diagnóstica da taquicardia ventricular monomórfica (TVM, através do eletrocardiograma de alta resolução (ECGAR, adicionando à análise no domínio do tempo (DT, técnicas estatísticas de correlação espectral no domínio da freqüência (DF. MÉTODOS: Foram estudados pelo ECGAR 137 indivíduos sendo 27 com cardiopatia e TVM sustentada, 30 com cardiopatia e sem TVM e 80 sem evidências de cardiopatia. Os parâmetros analisados no ECGAR no DT foram: duração do QRS filtrado, RMS40 e LAS40 e, no DF, as médias e os devios padrões da correlação espectral intersegmentar do sinal e da banda de freqüência delimitadora da concentração do sinal. RESULTADOS: A sensibilidade (Sb e o valor preditivo positivo (VPP do ECGAR no DT, DF e análise combinada de ambos os domínios foram, na detecção de TVM, respectivamente: Sb = 59,3%, 63% e 81,5% e VPP = 80,0%, 81,0% e 84,6%. CONCLUSÃO: A análise combinada do ECGAR nos DT e DF aumenta a acurácia diagnóstica de pacientes com apresentação clínica de TVM sustentada.

  6. Measurement of dose equivalent with personal dosemeters and instrumentation of radiological protection in the new operative ICRU magnitudes, for external fields of beta radiation. Part III. Determination of the joint of factors of angular conversion for the secondary source pattern Nr. - 86 Of (1850) MBq; Medicion de dosis equivalente con dosimetros personales e instrumentacion de proteccion radiologica en las nuevas magnitudes operativas ICRU, para campos de radiacion Beta externos. Parte III. Determinacion del conjunto de factores de conversion angular para la fuente patron secundario Nr.- 86 de (1850) MBq

    Energy Technology Data Exchange (ETDEWEB)

    Alvarez R, J.T. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    1994-02-15

    It determined the assembly of factors of angular conversion T(0;{alpha}), for the source secondary pattern of {sup 90}Sr/{sup 90}Y (1850 MBq) at a distance detecting source of 30 cm, in the following angles: 0, 15, 30, 45, 60 and 75{sup 0}. Obtaining the values of: 1.01, 1.05, 1.13, 1.19 and 0.95, respectively. Their Global uncertainty is smaller to 1.5% for all the cases and its percentage differences with regard to the values reported by the Draft of the norm ISO 6980(1992) they are smaller to 3.0% for all the cases.The technique employee was that of the extrapolation Chamber and the treatment of the uncertainties is made of agreement with the recommendations of the BIPM. (Author)

  7. Comparação entre a utilização de saliva e sangue para determinação do lactato mínimo em cicloergômetro e ergômetro de braço em mesa-tenistas Comparacion entre la utilizacion de saliva y sangre para la determinacion del lactato mínimo en cicloergómetro y ergómetro de brazo en tenistas de mesa Comparison between the use of saliva and blood for the minimum lactate determination in arm ergometer and cycle ergometer in table tennis players

    Directory of Open Access Journals (Sweden)

    Alessandro Moura Zagatto

    2004-12-01

    Full Text Available O objetivo do estudo foi verificar a possibilidade de determinar o teste de lactato mínimo (TLM com concentrações de sódio (Na+, potássio (K+ e lactato (LAC na saliva em ergômetro de braço e cicloergômetro. Foram participantes deste estudo oito mesa-tenistas de nível internacional. Como estímulo anaeróbio no TLM em ambos os ergômetros foram utilizados testes máximos de 30 segundos. No ergômetro de braço isocinético (Cybex Ube 2432 foi aplicada a força máxima com rotação fixa em 102rpm e no cicloergômetro, aplicada a carga de 7,5% do peso corporal (Kp. Após o estímulo anaeróbio no ergômetro de braço, foi iniciado um teste incremental com rotações na manivela constante a 60rpm, iniciado a 49 watts com aumento de 16 watts a cada estágio de três minutos de exercício. A intensidade correspondente ao TLM foi determinado com amostras de sangue e saliva (LACmin braço; Na+min braço-saliva e K+min braço-saliva, respectivamente. Para o cicloergômetro, a carga inicial foi de 85 watts e aumento de 17 watts com rotação do pedal constante a 70rpm. Cada estágio de exercício também teve a duração de três minutos. O LACmin foi determinado utilizando amostras de sangue e saliva (LACmin ciclo; Na+min ciclo-saliva, K+min ciclo-saliva e LACmin ciclo-saliva, respectivamente. Em ambos os ergômetros, as intensidades obtidas no TLM foram correspondentes à derivada zero do ajuste polinomial entre metabólito versus intensidade. Foram utilizados, como procedimentos estatísticos, o teste ANOVA One Way, teste t de Student pareado e teste de correlação de Pearson com níveis de significância de 5%. Os LACmin determinados com amostras de sangue e de saliva, tanto para o ergômetro de braço (LACmin braço 91,71 ± 12,43; Na+min braço-saliva 71,99 ± 23,42; K+min braço-saliva 79,67 ± 17,72, quanto para cicloergômetro (LACmin ciclo 157,68 ± 13,48; LACmin ciclo-saliva 135,49 ± 33,2; Na+min ciclo-saliva 121,81 ± 51,31; K+min ciclo-saliva 135,49 ± 33,21, não foram diferentes significativamente. Contudo, essas intensidades não apresentaram correlações significativas. Pode-se então concluir que a utilização de metabólitos na saliva para determinação do TLM não parece ser possível para esse protocolo quando os ergômetros utilizados são o ergômetro de braço isocinético e o cicloergômetro.El objetivo de estudio fué el de verificar la posibilidad de determinar el test de lactato mínimo (TLM con concentraciones de sodio (Na+, potasio (K+ y lactato (LAC en la saliva en ergómetro de brazo y cicloergómetro. Fueron participantes de este estudio ocho tenistas de mesa de nivel internacional. Como estímulo anaeróbico en el TLM en ambos ergômetros, fueron utilizados tests máximos de 30 segundos. En el ergómetro de brazo isocinético (CYBEX UBE 2432 fué aplicada la fuerza máxima con rotación fija en 102 rpm en el cicloergómetro aplicando una carga de 7,5% del peso corporal (Kp. Después del estímulo anaeróbico en el ergómetro de brazo, fué iniciado un test incremental con rotaciones en la manivela constante a 60 rpm, iniciando a 49 Watts con aumento de 16 Watts en cada etapa de 3 minutos del ejercicio. La intensidad correspondiente al TLM fué determinado con muestras de sangre y saliva (LACmin brazo; Na+min brazo-saliva e K+min braço-saliva, respectivamente. Para el cicloergometro, la carga inicial fue de 85 Watts y aumento de 17 Watts con rotación del pedal constante a 70 rpm. Cada etapa de ejercicio también tiene una duración de 3 minutos. El LACmin fué determinado utilizando las muestras de sangre y saliva (LACmin ciclo; Na+min ciclo-saliva, K+min ciclo-saliva e LACmin ciclo-saliva, respectivamente. En ambos ergómetros, las intensidades obtenidas en el TLM fueron correspondientes a la derivada cero del ajuste polinominal entre metabólito versus intensidad. Fueron utilizados como procedimientos estadísticos, el test ANOVA One Way, test "t" de Student apareado al test de correlación de Pearson con niveles de significancia de 5%. Los LACmin determinados

  8. ECG signal analysis with wavelets and neural networks in FPGA

    OpenAIRE

    Klaus Raizer

    2010-01-01

    Resumo: Este trabalho apresenta a implementação de um sistema de análise de sinais de ECGs (eletrocardiogramas) embarcado em FPGA (field programmable gate array), capaz de classificar cardiopatias. A análise de ECGs é de grande importância devido a sua natureza potencialmente não-invasiva, baixo custo e alta eficiência na identificação de patologias cardíacas. Visto que um sinal de ECG pode ser composto por horas de gravação da atividade cardíaca, uma abordagem computacional para a sua anális...

  9. Prótese valvular e o impacto na consulta de medicina dentária: um caso clínico

    OpenAIRE

    Gomes, Daniela de Araújo Gonçalves

    2016-01-01

    Dissertação para obtenção do grau de Mestre no Instituto Superior de Ciências da Saúde Egas Moniz Este caso clínico consiste na reabilitação oral de um paciente com prótese valvular cardíaca, apresentando um tratamento multidisciplinar que passa pelas áreas de Medicina Dentária Preventiva e Comunitária, Dentisteria, Periodontologia e Reabilitação Oral (prótese). Neste trabalho foi feito uma breve introdução sobre as cardiopatias dando principal foco nas valvulopatias, e, uma vez abordad...

  10. Anestesia para correção cirúrgica de blalock-taussig e implante de marca-passo em adulto portador de ventrículo único: relato de caso Anestesia para corrección quirúrgica de blalock-taussig e implante de marcapaso en adulto portador de ventrículo único: relato de caso Anesthesia for blalock-taussig shunt and pacemaker placement in an adult patient with univentricular heart: case report

    OpenAIRE

    Michelle Nacur Lorentz; Raquel Reis Soares; Cláudia Vargas Araújo Ribeiro; Friederike Wolff Valadares

    2008-01-01

    JUSTIFICATIVA E OBJETIVOS: O ventrículo único é uma cardiopatia complexa rara e grave, sem possibilidade de tratamento cirúrgico curativo, associada à alta mortalidade durante a primeira infância. O objetivo desse artigo foi descrever um caso raro de paciente adulto com ventrículo único não-operado que se internou para realização de valvoplastia pulmonar via hemodinâmica e acabou sendo submetido à cirurgia de Blalock-Taussig modificado e implante de marca-passo epicárdico. Teve como objetivo ...

  11. Sistema computacional para o processamento, a análise e a classificação do sinal eletrocardiográfico de neonatos e adultos

    OpenAIRE

    2006-01-01

    Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia Elétrica. O eletrocardiograma (ECG) é uma ferramenta utilizada para o diagnóstico de cardiopatias e outras doenças. Sua análise pode ser realizada automaticamente por sistemas computacionais. No entanto, algoritmos desenvolvidos para análise do ECG de pacientes adultos não podem ser aplicados em neonatos, devido às diferenças entre os padrões do ECG de um adulto e de...

  12. Prevalencia de ateroesclerosis en pacientes diabéticos tipo 2 asintomáticos diagnosticados por TAC coronario multicorte. Relación con el grado control.

    OpenAIRE

    García Bellón, Ana María

    2013-01-01

    Las personas con Diabetes tipo 2 muestran una condición proaterogénica que las caracteriza como grupo con alta probabilidad de accidentes coronarios, debido a la confluencia de múltiples mecanismos patogénicos,presentando mayor prevalencia de afectación neuropática lo determina mayor frecuencia de isquemia miocárdica asintomática.La Tomografía Axial Computarizada Multicorte ha facilitado el estudio no invasivo del territorio coronario en pacientes sin sintomas tipicos de cardiopatia isquémica...

  13. Tetralogia de Fallot em gato - relato de caso

    OpenAIRE

    Daniel,Alexandre Gonçalves Teixeira; Pellegrino,Arine; OLIVEIRA, Roberta Alencar de; V.M.C. Oliveira; P.S.L. Carvalho; LARSSON, Maria Helena Matiko Akao

    2009-01-01

    A tetralogia de Fallot é a cardiopatia que mais comumente causa cianose nos animais domésticos, sendo pouco frequente em gatos. Um felino, macho, de oito meses de idade foi atendido no Serviço de Cardiologia do Hospital Veterinário da Faculdade de Medicina Veterinária e Zootecnia da Universidade de São Paulo com quadro de dispineia progressiva e cianose, com duração de dois meses. Exames radiográficos, eletrocardiográficos foram compatíveis com a tetralogia de Fallot. A tetralogia de Fallot é...

  14. "Subsídios para o planejamento de cuidados especiais para o atendimento odontológico de pacientes portadores de diabetes mellitus tipo 2"

    OpenAIRE

    Luis Antonio Cherubini Carvalho

    2003-01-01

    RESUMO Além das manifestações sistêmicas que acometem os pacientes portadores de Diabetes Mellitus (DM), como angiopatias, cardiopatias, retinopatias, nefropatias e hipertensão arterial, estes pacientes apresentam também respostas diminuídas a infecção, quando descompensados, fazendo que o transcurso da doença se desenvolva de forma diferenciada do paciente normoglicêmico. Esta característica irá se apresentar, também, na cavidade bucal, fato este que deverá alertar o cirurgião dentista qu...

  15. Calidad de vida, cumplimiento terapéutico y bajas laborales en pacientes con cardiopatía isquémica

    OpenAIRE

    Català Tella, Nausica

    2016-01-01

    La cardiopatia isquèmica en el nostre entorn és un problema de primera magnitud per l'elevada freqüència de la malaltia, el consum de recursos i la mortalitat que ocasiona. En el seguiment d'aquests pacients en atenció primària destaca la prevenció secundària, amb l'objectiu de perllongar i millorar la qualitat de vida dels individus amb patologia cardiovascular. Així mateix els pacients que pateixen un esdeveniment agut necessiten de la prescripció d'una baixa laboral durant el període de...

  16. Levosimendan no tratamento da contusão miocárdica grave pós-trauma torácico fechado: relato de caso = Levosimendan treatment for severe myocardial contusion after blunt chest trauma: case report

    Directory of Open Access Journals (Sweden)

    Benincasa, Cristian Chassot

    2007-01-01

    Conclusão: na literatura existem dados que indicam a utilização de levosimendan na insuficiência cardíaca descompensada. Estudos experimentais e pequenos ensaios clínicos tem despertado o interesse na utilização de levosimendan para melhora da função miocárdica em pacientes com cardiopatia isquêmica, choque cardiogênico e choque séptico. Porém, ainda não há relatos sobre a sua utilização em contusão miocárdica

  17. Efeitos de compostos quinazolinicos com propriedades inibidoras de tirosina quinase em corações isolados de ratos

    OpenAIRE

    Rodrigo Miguel Marin

    2003-01-01

    Resumo: As doenças do miocárdio constituem umas das principais causas de morbidade e mortalidade da população em geral. Hoje, as modalidades farmacológicas disponíveis são eficientes no tratamento dos sintomas, no entanto possuem poucos efeitos sobre a progressão das cardiopatias. Estudos preliminares evidenciam que a interferência nas vias de sinalização celular relacionadas ao desenvolvimento das doenças cardiovasculares pode ser um alvo potencial para bloquear a progressão, bem como revert...

  18. Política pública estatal de las TIC: una corta visión social

    OpenAIRE

    Guadalupe María Becerra Sánchez; Ruth Padilla Muñoz

    2011-01-01

    En este trabajo se expone una parte de los resultados del estudio concluido sobre la presencia de los cibercafés de la ciudad de Guadalajara, como establecimientos representativos del acceso comer - cial a Internet (Becerra, 2010). La presencia de los cibercafés obedece a múltiples determinaciones del contexto social y económico, y expresan lo que las políticas públicas de tecnologías de la infor - mación y la comunicación han determinado respecto de la visión social, proyectos y estrategias ...

  19. Marcadores Hemoquímicos de afectación al tejido nervioso como indicadores de daño en la hipertensión arterial esencial y en el ictus

    OpenAIRE

    González García, Sergio

    2014-01-01

    En el presente trabajo se aborda la aplicabilidad clínica de las determinaciones séricas de algunos marcadores hemoquímicos de daño del SNC (NSE y S100B), inflamatorios (PCR, C3, C4 y AAT), de trombosis (fibrinógeno y DD) y de disfunción endotelial (μalb) en dos enfermedades íntimamente relacionadas, donde la afectación vascular constituye la base fisiopatológica: la HTA esencial y el ictus agudo. El objetivo principal de esta investigación fue evaluar la utilidad de marcadores hemoquímicos c...

  20. Valor de los metodos directos e indirectos de diagnóstico en las micosis sitémicas asociadas al SIDA

    OpenAIRE

    Arechavala,A.I.; A.M. Robles; R. Negroni; Bianchi,M.H.; A. Taborda

    1993-01-01

    Durante 5 años se estudiaron 117 pacientes con micosis sistémicas asociadas al SIDA: 74 criptococosis, 39 histoplasmosis y 4 con ambas enfermedades. Para el diagnóstico analizamos los siguientes materiales: escarificaciones de lesiones cutáneas o mucosas, aspirados de médula ósea, secreciones bronquiales, biopsias de diversos órganos, líquido cefalorraquídeo, hemocultivos y sueros para determinaciones serológicas. Fueron estudiadas en total 203 muestras de pacientes con histoplasmosis, el 46....