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Sample records for ductos minatitlan evaluacion

  1. Evaluation and diagnosis of the cathodic protection of ducts in the left margin of the Tonala River of the Superintendencia General de Ductos Minatitlan; Evaluacion y diagnostico de la proteccion catodica en la margen izquierda del Rio Tonala de la Superintendencia General de Ductos Minatitlan

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez N, Miguel A; Malo T, Jose M; Munoz Ledo C, Ramon; Uruchurtu C, Jorge; Castrejon G, Rafael [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico); Sanchez G, Luis; Algarra M, Raul; Abreu L, Emilio [Gerencia de Mantenimiento, Pemex (Mexico)

    2003-07-01

    The present study contains the measurements obtained as a part of the evaluation of the protection system of ducts located in the left margin of the Tonal River, made by the Gerencia de Materiales y Procesos Quimicos of the Instituto de Investigaciones Electricas (IIE) during the last trimester of year 2001. Also, the measurements of potential in conditions of instantaneous ignition and extinguished in measuring posts of the duct in Rights of Way (DDV) Tonala-Nudo Teapa 23 are studied, in order to determine the real protection level reached by the cathodic protection system, the possible unprotected zones and the possible corrective measures that lead to a safe operation of the ducts. [Spanish] El presente estudio contiene las mediciones obtenidas como parte de la evaluacion del sistema de proteccion de los ductos ubicados en la margen izquierda del rio Tonala, realizadas por la Gerencia de Materiales y Procesos Quimicos del Instituto de Investigaciones Electricas (IIE) durante el ultimo trimestre del ano 2001. Asimismo, se tratan las mediciones de potencial en condiciones de encendido y apagado instantaneo en postes de medicion del ducto en los Derechos De Via (DDV) Tonala-Nudo Teapa 23, con el proposito de determinar el nivel real de proteccion alcanzado por el sistema de proteccion catodica, las posibles zonas desprotegidas y las posibles medidas correctivas que conduzcan a una operacion segura de los ductos.

  2. Identification of hitherto unrecognized arboviruses from Ecuador: members of serogroups B, C, Bunyamwera, Patois, and Minatitlan.

    Science.gov (United States)

    Calisher, C H; Gutierrez, E; Francy, D B; Alava, A; Muth, D J; Lazuick, J S

    1983-07-01

    Three hundred seventy-nine virus isolates were obtained from mosquitoes collected and sentinel hamsters exposed in coastal Ecuador from 1974 to 1978. These included four alphaviruses [Venezuelan equine encephalitis 1B (1), Venezuelan equine encephalitis 1D (35), western equine encephalitis (1) and eastern equine encephalitis (4)]; two flaviviruses [St. Louis encephalitis (3) and Naranjal (6)]; 11 bunyaviruses [Maguari (243), Playas (3), Vinces (33), Turlock (2), Abras (5), Babahoyo (3), Acara (2), Guajara (3), San Juan (6), Pueblo Viejo (3), 18 unspecified Gamboa serogroup viruses, Palestina (7)]; and one vesiculovirus (vesicular stomatitis New Jersey). All but Venezuelan equine encephalitis virus were new to Ecuador, and Naranjal (serogroup B), Playas (Bunyamwera serogroup), Vinces (serogroup C), Abras and Babahoyo (Patois serogroup), San Juan and Pueblo Viejo (Gamboa serogroup) and Palestina (Minatitlan serogroup) are newly recognized viruses. These isolates have enabled us to 1) expand our knowledge of the geographic distribution of recognized viruses, 2) expand our knowledge of the members of certain serogroups and 3) establish two new serogroups (Gamboa and Minatitlan).

  3. Repercussões temporais da ligadura do ducto biliar principal em ratos Wistar

    Directory of Open Access Journals (Sweden)

    Maia Eugenio Lincoln Campos

    2003-01-01

    Full Text Available OBJETIVO: Objetivou-se investigar os efeitos temporais da ligadura do ducto biliar principal, em ratos Wistar. MÉTODOS: Utilizaram-se 48 ratos machos distribuídos em 2 grupos e redistribuídos em 4 subgrupos (n=06, identificados pelo tempo estipulado para a coleta das amostras (12, 24, 48 e 168 horas. Após laparotomia, os animais foram submetidos à dissecção e passagem de dois fios circundando o ducto biliar principal, sem ligadura (Grupo 1 e com ligadura (Grupo 2. RESULTADOS: As concentrações das bilirrubinas séricas (total, direte e indireta quando comparadas ao repectivo grupo controle, aumentaram (p<0,05 nos animais do grupo 2, nos tempos 24, 48 e 168 horas. As concentrações de proteína C reativa e fosfatase alcalina aumentaram (p<0,05 no grupo 2 no tempo 24 horas e nos tempos 24 e 48 horas, respectivamente. Concentrações de albumina e gamaglutamil transferase, não apresentaram diferenças significantes nos dois grupos. Foram observadas, no exame histopatológico, hiperplasia ductal, pericolangite e colangite no grupo 2 e pericolangite no grupo 1. CONCLUSÕES: A ligadura do ducto biliar principal induz aumento das concentrações séricas de bilirrubinas, proteína C reativa e fosfatase alcalina. Hiperplasia ductal, pericolangite e colangite são as principais alterações histológicas encontradas nos fígados dos ratos submetidos à ligadura do ducto biliar principal.

  4. Automatic leak location in a pipe; Localizador automatico de fugas en un ducto

    Energy Technology Data Exchange (ETDEWEB)

    Carrera Mendez, Rolando; Verde Rodarte, Cristina [Universidad Nacional Autonoma de Mexico (Mexico)

    2001-06-01

    A real time method for detecting and locating leaks in pipes is analysed. By monitoring pressure gradients of a pipe in a steady state operation, expressions that indicate the existence of a leak and its location are derived. For small leaks it is possible to deduce alternative expressions based on in- and outflow deviations from their normal values. These deviations are estimated by means of a nonlinear dynamic flow observer. It is an easy task to carry out this system and the detection and location algorithm require low resource. As a result of this analysis it was found that the identifier is very sensitive to variations of the D'Arcy-Weissbach friction. [Spanish] Se describe y analiza un metodo que permite detectar y ubicar fugas de liquidos en un ducto sin tomas laterales en tiempo real. A partir de una operacion en estado permanente y del monitoreo de los gradientes de presion en los extremos de la tuberia, se derivan expresiones que permiten detectar la existencia de una fuga y su localizacion. Tambien se muestra que para fugas pequenas se pueden obtener expresiones alternativas para la deteccion y localizacion, basadas en las desviaciones de los flujos con respecto a sus valores nominales. Dicha desviacion se estima con un observador dinamico no lineal del comportamiento de flujo. La realizacion es de facil implantacion y el algoritmo se deteccion y localizacion requiere de pocos recursos de computacion. Del analisis presentado se desprende que el localizador es muy sensible a las variaciones en la estimacion de la friccion de D'Arcy-Weissbach del ducto.

  5. La calidad de las evaluaciones de manuscritos en Gaceta Sanitaria

    Directory of Open Access Journals (Sweden)

    García A.M.

    2002-01-01

    Full Text Available Objetivo: Describir las cualidades y limitaciones de las evaluaciones externas de los manuscritos remitidos a Gaceta Sanitaria para mejorar la selección de los evaluadores, aumentar la calidad de las evaluaciones y establecer un sistema interno que pudiera incorporarse al proceso editorial de gestión de los manuscritos. Métodos: Se incluyeron 100 evaluaciones de 55 manuscritos recibidos durante los años 2000 y 2001. Se aplicó un formulario de preguntas cerradas en el que se valoraban aspectos específicos y generales de calidad en las evaluaciones (respuestas sí/no o sobre una escala de 1 a 5. Se llevó a cabo un análisis descriptivo y de correlación entre los distintos ítems del formulario. Se calculó un Índice de Calidad como suma de las puntuaciones de los ítems específicos. Resultados: Las evaluaciones obtuvieron puntuaciones más elevadas en relación con la compleción del formulario para los revisores (84%, la utilización de un tono constructivo con los autores (evaluaciones por encima de 3: 63%, la identificación de cualidades y limitaciones metodológicas (evaluaciones por encima de 3: 59% y la fundamentación de los comentarios del evaluador (evaluaciones por encima de 3: 58%. Con menor frecuencia, se valora la relevancia (evaluaciones por encima de 3: 40% o la originalidad (evaluaciones por encima de 3: 35% del manuscrito. La utilidad global de la evaluación para el editor y la calidad global de la evaluación mostraron una elevada correlación con el resto de ítems específicos en el formulario y con el Índice de Calidad. Conclusiones: La calidad general de las evaluaciones externas de manuscritos en Gaceta Sanitaria se puede considerar alta. Se ponen de manifiesto los aspectos mejorables de las evaluaciones. Se podría establecer un proceso sistemático de valoración de las evaluaciones externas utilizando indicadores simples como la valoración global de la utilidad o de la calidad de la evaluación en su

  6. La evaluacion y el analisis de politicas publicas

    National Research Council Canada - National Science Library

    Salazar Vargas, Carlos

    2009-01-01

    Dentro del "EPPPAL: Enfoque Propio de Politicas Publicas desde y para America Latina", la distincion entre "evaluacion" y "analisis" es un tema crucial, ya que equilibra, complementa y cuestiona la generosa propuesta...

  7. Implante de ducto nasolacrimal de poliuretano: relato de caso Nasolacrimal stent implantation: report of a case

    Directory of Open Access Journals (Sweden)

    Patrícia Lunardelli

    2008-02-01

    Full Text Available Obstrução parcial ou completa da via lacrimal provoca um lacrimejamento constante ou intermitente denominado epífora. O tratamento preconizado para os casos de epífora com obstruções localizadas abaixo do canalículo comum é a dacriocistorrinostomia externa ou a dacriocistorrinostomia via endoscópica. Nos últimos anos foram criadas e aperfeiçoadas técnicas alternativas para o tratamento de epífora como a intubação da via lacrimal com tubos de silicone, dilatação do ducto nasolacrimal (dacriocistoplastia e o desenvolvimento de implantes nasolacrimais. O objetivo deste trabalho é relatar a primeira experiência brasileira com o implante de poliuretano, realizado pelos serviços de Radiologia Intervencionista e Oftalmologia do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo - USP - SP. Embora o implante nasolacrimal tenha suas vantagens por ser um procedimento radiológico intervencionista versus uma cirurgia invasiva, não é o procedimento indicado como tratamento primário da obstrução do ducto nasolacrimal. Estudos a longo prazo ainda são necessários para avaliar e resolver as complicações encontradas nos últimos trabalhos. Novos desenhos e métodos de recanalização in situ (mecanicamente ou com auxílio de medicações talvez melhorem a viabilidade deste método terapêutico para a resolução de epífora.Epiphora (watering eye is generally caused by insufficient drainage of tears. The most common cause of epiphora in adults is idiopathic inflammatory obstruction of the nasolacrimal duct. The traditional surgical treatment of nasolacrimal duct obstruction is an external dacryocystorhinostomy, which has an 85% to 95% success rate. To eliminate cutaneus wounds and scarring some techniques were introduced, for example the endonasal laser dacryocystorhinostomy and the nasolacrimal stent. The aim of this report was to evaluate the first case of nasolacrimal stent implantation in Brazil. The

  8. Evaluacion de los aprendizajes en lenguas extranjeras: hacia practicas justas y democraticas

    National Research Council Canada - National Science Library

    Arias, Clara Ines; Maturana, Liliana; Restrepo, Maria Isabel

    2012-01-01

    La falta de coherencia encontrada entre la evaluacion y la promocion en lenguas extranjeras se abordo en esta investigacion-accion interinstitucional con la consolidacion de un Sistema consensuado de Evaluacion...

  9. Efectos de la inflacion y la devaluacion en la evaluacion de flujos de inversion

    National Research Council Canada - National Science Library

    Sole Madrigal, Roberto

    2012-01-01

    ... las tasas sean "de un digito", es importante poder tomar en cuenta sus efectos a lo largo del tiempo en un proyecto para su evaluacion e impacto en sus metricas de evaluacion tradicionalmente utilizadas: Valor Actual Neto (VAN...

  10. Desarrollo de software para el análisis probabilístico de integridad de ductos

    Directory of Open Access Journals (Sweden)

    José de Jesús Silva-Lomelí

    2012-01-01

    Full Text Available Una de las aplicaciones de la mecánica de la fractura probabilística (MFP es el estudio de oleogasoductos, este procedimiento se basa en la determinación de la probabilidad, en donde variables aleatorias como: cargas aplicadas, propiedades mecánicas del material, geometría del ducto y grietas, pueden ocasionar la falla de una estructura. Utilizando el método Monte Carlo escenarios múltiples, introduciendo valores aleatorios a partir de las distribuciones de probabilidad tanto de carga como de resistencia. El resultado obtenido de este análisis es una distribución estadística de la probabilidad de falla; mientras que la mecánica de fractura determinística (MFD solamente genera el valor de JIc para fractura elasto-plástica (MFEP de ciertos valores previos. De esta manera, los análisis probabilísticos proporcionan un panorama más completo de la situación real de la integridad de ductos. La aplicación de la MFP reemplaza el factor de seguridad clásico N por el concepto de confiabilidad estructural. De esta manera, el análisis de riesgo basado en la mecánica de fractura probabilística permite incrementar el nivel de seguridad en oleogasoductos y al mismo tiempo disminuir los costos de mantenimiento. Este trabajo considera los siguinetes puntos: a. Determinar dos ecuaciones determinísticas para la Integral Ja y Jc. b. Crear un programa generatedo en el ambiente MATLAB, este código muestra los procesos determinísticos y probabilísticos del análisis de ductos, con una relación Ri/t = 43.6 para mecánica de fractura elastoplástica.

  11. Efeito da idade e da testosterona sobre a expressão fisiologica de adrenoceptores alfa-1 em ductos deferentes de ratos

    OpenAIRE

    Jose Luiz Tatagiba Lamas

    1990-01-01

    Resumo: O objetivo deste trabalho é determinar o efeito do processo de desenvolvimento e envelhecimento e de uma dose de testosterona, administrada no 22° dia de vida sobre a resposta contrátil de ductos diferentes de ratos Wistar pré-púrberes (3semanas), jovens (3 meses) e senis (22 meses). Um grupo de ratos pré-púrberes foi tratado com testosterona (1mg/kg, SC) 24 horas antes do experimento. Foram obtida curvas concentração-efeito à noradrenalina em ductos diferentes submetidos a três condi...

  12. Ligadura de ducto arterioso persistente en un cocker spaniel de dos meses de edad: reporte de caso

    Directory of Open Access Journals (Sweden)

    Ximena Escobar Correa

    2016-06-01

    Full Text Available El presente artículo reporta el caso de una hembra canina cocker spaniel entera de dos meses de edad, que fue llevada a la Clínica para Pequeños Animales de la Universidad Nacional de Colombia, con tos de seis días de evolución, poca ganancia de peso e historial de soplo cardiaco detectado con anterioridad en un centro veterinario. Tras realizar el examen médico, se perciben estertores en ambos campos pulmonares, aumento del reflejo tusígeno, pulso yugular positivo, un soplo cardiaco 6/6 y aumento del tiempo de llenado capilar. Se diagnostica la persistencia de ducto arterioso mediante ecocardiografía, por lo cual se plantea la ligadura del ducto como tratamiento definitivo. La paciente se recuperó satisfactoriamente del procedimiento quirúrgico sin tener ningún tipo de complicación; en el postoperatorio presentó tos que se resolvió a los pocos días con ayuda de un tratamiento con furosemida (2 mg/kg TID IM. Tres meses después de realizarse el procedimiento quirúrgico la paciente se encontraba clínicamente sana, sin ninguna manifestación de origen cardiaco.

  13. Evaluacion del impacto de las incubadoras de empresas: estudios realizados

    National Research Council Canada - National Science Library

    Gomez, Nunez, Liyis

    2002-01-01

    ... de su impacto en la comunidad y de como evaluarlo. Este trabajo tiene como proposito analizar los estudios mas significativos al respecto y formular directrices que permitan el diseno de programas de evaluacion. Palabras clave: Incubacion de empresas, incubadora de empresas, crecimiento economico, estrategia de desarrollo, desarrollo local, entrepre...

  14. Caracteristicas psicometricas de la escala BRIEF para la evaluacion de funciones ejecutivas en poblacion clinica espanola

    National Research Council Canada - National Science Library

    2014-01-01

    Antecedentes: la escala Behavior Rating Inventory of Executive Functions (BRIEF), cumplimentada por familias, es ampliamente conocida en la evaluacion de las funciones ejecutivas en ninos y adolescentes...

  15. Morbimortalidade relacionada à técnica de anastomose pancreática (ducto-mucosa x telescopagem após cirurgia de Whipple

    Directory of Open Access Journals (Sweden)

    Jorge Mali Junior

    Full Text Available OBJETIVOS: A gastroduodenopancreatectomia (GDP é atualmente a única forma de tratamento segura e eficaz para pacientes selecionados com doenças benignas e malignas do pâncreas e da região periampular. Entre as complicações pós-operatórias, a fístula pancreática continua sendo a mais importante, com uma incidência que varia de 5 a 25% nas grandes séries. Os objetivos deste trabalho são os de avaliar a morbimortalidade relacionada a duas técnicas de anastomoses pancreatojejunais (ducto-mucosa X telescopagem, e comparar seus resultados. MÉTODO: Foram analisados retrospectivamente 64 pacientes submetidos à GDP, no Serviço de Cirurgia Abdômino-Pélvica, do INCA, no período de 1987 a 2002. Destes doentes, 42 foram submetidos à anastomose tipo ducto-mucosa e 22 à telescopagem. A análise estatística foi realizada através do teste de Fischer. RESULTADOS: A taxa de fístula pancreática no grupo ducto-mucosa foi de 12% e no telescopagem foi 36%. Esta diferença percentual se mostrou estatisticamente significativa (p = 0,02. A mortalidade operatória relacionada à fístula pancreática foi de 2,4% para o grupo ducto-mucosa e 4,5% para o telescopagem, com nível de significância estatística > 5%. CONCLUSÕES: A técnica de anastomose pancreatojejunal tipo ducto-mucosa é associada a menores índices de fístula pancreática em relação a técnica de telescopagem, enquanto que a mortalidade operatória relacionada a fístula não mostrou diferença estatística entre os dois grupos estudados.

  16. CORREÇÃO DA ESTENOSE DO DUCTO PAPILAR DE VACAS LEITEIRAS COM INSTRUMENTO CIRÚRGICO EM FORMA DE LANCETA

    Directory of Open Access Journals (Sweden)

    Débora Pereira Garcia

    2006-10-01

    Full Text Available A estenose do ducto papilar é uma lesão que causa dificuldade para a ordenha manual, e por isso é uma das principais causas de descarte de vacas leiteiras. Oitenta vacas, com idade variando de três a onze anos, no período entre 30 e 60 dias após parto, foram alocadas em três grupos assim constituídos: GI (controle – 40 fêmeas sem estenose do ducto papilar; GII, 20 animais submetidos a procedimento cirúrgico, sem tratamento medicamentoso durante o período pós-operatório; GIII, 20 animais submetidos a procedimento cirúrgico, seguido da aplicação de gentamicina intramamária por sete dias. Para a correção cirúrgica da estenose, utilizou-se um instrumento de aço inoxidável com cabo de 15 cm, provido de lâmina em forma de lanceta, com dois centímetros em seu eixo longitudinal e um centímetro em seu eixo transversal e dotada de bordas laterais cortantes. As intervenções cirúrgicas foram realizadas com os animais em posição quadrupedal, com o teto repleto, e as incisões praticadas sempre em um único sentido e de uma só vez. Os animais foram avaliados, diariamente, por 60 dias, para observação da recuperação e de possíveis complicações pós-operatórias. Durante esse período, observou-se, nos grupos II e III, recidiva de estenose do ducto papilar em dois animais, hemorragia em seis, presença de mastite clínica em três, mastite sub clínica em dez, jato disperso em dois e incontinência láctea em um. Não houve diferença significativa para a ocorrência de mastite clínica e subclínica. O procedimento cirúrgico foi eficaz em 87,5%dos animais operados e pode constituir-se em uma alternativa para correção de estenose do ducto papilar em vacas leiteiras. PALAVRAS-CHAVE: Teto, estenose, cirurgia, bovino.

  17. Study of risk in gasoline and diesel transportation pipelines in Mexico; Estudio del riesgo en ductos de transporte de gasolinas y diesel en Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Olivera Villasenor, Ruperto Enrique [Universidad Nacional Autonoma Mexico, Mexico D.F. (Mexico); Rodriguez Castellanos, Alejandro [Instituto Mexicano del Petroleo, Mexico D.F. (Mexico)

    2005-10-15

    A methodology of risk operative analysis for damages, which are derived from theft of gasoline in Petroleos Mexicanos (Pemex) pipelines by third parts (clandestine pipes) is proposed. Originally, the problematic is studied from the global perspective of pipelines accidents happened in the world, in United States of America and in Mexico, and later it approaches specifically the environment that the industry of Pemex-Refinery pipelines. When the results are obtained, it is concluded that the factor of risk with more occurrence probability of pipelines, is due to damages for third parts, in first term, and followed by the damages originated by corrosion in second term. So a diagnostic is made of the physical vulnerability degree on the rights of way of Pemex. [Spanish] Se propone una metodologia de analisis de riesgo operativo en poliductos debido a danos por terceras partes (tomas clandestinas), originados del hurto de gasolinas en ductos de Petroleos Mexicanos (Pemex). La problematica se aborda desde una perspectiva global de accidentes en los ductos de Pemex-Refinacion. Del analisis y resultados obtenidos, se concluye que el factor de riesgo con mayor probabilidad de ocurrencia en poliductos, es debido a danos por terceras partes, en primer termino, seguido de los danos originados por corrosion. Asimismo se hace un diagnostico del grado de vulnerabilidad fisica de los derechos de via de Pemex.

  18. Simulacion y evaluacion de una propuesta de implementacion del minimo vital de agua potable en Colombia

    National Research Council Canada - National Science Library

    Mendez Sayago, Jhon Alexander; Mendez Sayago, Johanna Mildred

    2011-01-01

    Este articulo presenta la simulacion y evaluacion de la implementacion del minimo vital de agua potable para los usuarios de los estratos uno y dos, subsidiada a partir del incremento en las tarifas...

  19. Metodos estadisticos de evaluacion de la concordancia y la reproducibilidad de pruebas diagnosticas

    National Research Council Canada - National Science Library

    Cortes-Reyes, Edgar; Rubio-Romero, Jorge Andres; Gaitan-Duarte, Hernando

    2010-01-01

    Introduccion: en la evaluacion de la utilidad de una prueba diagnostica, se requiere en algunas situaciones valorar la reproducibilidad de los resultados o la concordancia de los mismos al compararla...

  20. AVALIAÇÃO DE CITOCINAS NA FIBROSE HEPÁTICA INDUZIDA EM RATOS PELA LIGADURA DO DUCTO BILIAR

    Directory of Open Access Journals (Sweden)

    Juliana Saraiva Freitas

    2015-01-01

    Full Text Available A fibrose hepática é uma doença causada por uma grande variedade de doenças crônicas que afetam o fígado após diferentes agressões, cujo único tratamento é o transplante de fígado. A patogênese da fibrose engloba uma complexa interação entre as células e a matriz extracelular do tecido hepático, interações estas mediadas por citocinas que modulam a progressão da fibrose. O objetivo do trabalho foi analisar quantitativamente o perfil de citocinas pró-inflamatórias (IL-6 e TNF-a e anti-inflamatória (IL-10 no fígado de ratos, com diferentes graus de fibrose, induzida pela ligadura do ducto biliar (LDB. Vinte ratos foram submetidos ao procedimento da LDB e eutanasiados após 2, 4 e 6 semanas da indução da fibrose para a remoção do fígado e quantificação das citocinas pró e anti-inflamatórias pelo método de ELISA sanduíche. Foi observado o aumento na concentração de todas as citocinas após 4 semanas da LDB e diminuição dessas concentrações na 6ª semana. Dentre as citocinas pró-inflamatórias, o TNF-a mostrou aumento e diminuição estatisticamente significantes, respectivamente, na 4ª e 6ª semana, quando comparado a IL-6, a qual não apresentou significância estatística em nenhuma semana após a LDB. A IL-10, mostrou-se, significativamente, elevada na 4ª semana, seguida de uma diminuição moderada na 6ª semana. Esses resultados indicam que o TNF é a principal citocina na progessão da fibrose biliar, principalmente, durante sua fase intermediária. Ao mesmo tempo, a IL-10 atua nessa fase, limitando a produção da citocina pró-inflamatória TNF-a, na tentativa de um controle endógeno da progressão da doença.

  1. REVISIÓN DE LAS EVALUACIONES ADAPTATIVAS COMPUTARIZADAS (CAT

    Directory of Open Access Journals (Sweden)

    Ruber López

    2015-06-01

    Full Text Available En este artículo presentamos una revisión de las Evaluaciones Adaptativas Computarizadas. A diferencia de los test convencionales, estas evaluaciones plantean un examen adaptado a las necesidades y capacidades de cada uno de los evaluados, lo cual redunda en una mejor experiencia para el evaluado y en una mayor precisión del resultado. Las evaluaciones adaptativas se fundamentan en la teoría de respuesta a ítems, que define las directrices y condiciones para que este tipo de pruebas sea posible. A partir de esta teoría, surgen distintos modelos que permiten modelar diferentes rasgos de los evaluados y la relación de estos con la probabilidad de acertar un ítem dado. Para llevar a cabo el proceso de evaluación, un test adaptativo debe estar conformado de un banco de ítems, un método que permita la selección de estos y un criterio de terminación. Todos estos componentes articulan la prueba y la ayudan a concretarse adecuadamente. AbstractThis paper is a review of the Computerized Adaptive Testing Process. Unlike conventional tests, these assessments propose a test adapted to every examinee’s needs and capabilities, which results in a better experience for those assessed and a more accurate score. Adaptive assessments are based on item response theory, which defines the guidelines and conditions for such tests to be carried out. From this theory, different models that allow the repositioning of different traits of the examinees and their relationship with the probability to succeed in a given item, arise. To complete the assessment process, an adaptive test should consist of a set of items, a method which allows the selection of these and a termination criterion. All the aforementioned components articulate the test and help to properly materialize it.

  2. Dopplerfluxometria do ducto venoso: relação com a gasometria em fetos prematuros com centralização de fluxo sangüíneo

    OpenAIRE

    Sá Renato Augusto Moreira de; Netto Hermógenes Chaves; Lopes Laudelino Marques; Barreto Mário Jorge Viegas; Cabral Antônio Carlos Vieira

    2003-01-01

    OBJETIVO: avaliar o desempenho da dopplerfluxometria do ducto venoso (DV) na detecção da acidemia em fetos prematuros apresentando centralização de fluxo sangüíneo. MÉTODOS: estudo observacional transversal. A população em estudo consistiu de 48 gestantes entre a 25ª e a 33ª semana de gestação, que apresentavam centralização de fluxo sangüíneo fetal (relação umbílico/cerebral >1). O tempo decorrido entre o diagnóstico de centralização fetal e o nascimento (cesariana sob anestesia peridural) f...

  3. El CAD-S, un instrumento para la evaluacion de la adaptacion al divorcio-separacion

    National Research Council Canada - National Science Library

    Yarnoz Yaben, Sagrario; Comino Gonzalez, Priscila

    2010-01-01

    ... de la investigacion sobre el tema del divorcio y sus consecuencias en adultos y ninos (Hetherington, 2005; vease tambien Amato, 2000; y Kelly, 2000, para una amplia revision) que puede servir de base a posibles tratamientos o intervenciones preventivas es importada de paises como los Estados Unidos. Lo mismo ocurre con los instrumentos de evaluacion. En el momento ...

  4. Evaluacion sensorial de arroz (Oryza sativa) variedad Azucena en la Region Autonoma del Atlantico Norte en Nicaragua

    National Research Council Canada - National Science Library

    Garcia Montecinos, Karina Leticia; Carrillo Centeno, Patricia Mercedes; Godoy Godoy, Jose Alberto; Pachon, Helena

    2011-01-01

    .... Materiales y metodos: la evaluacion sensorial del arroz Azucena versus una variedad de consumo local, se realizo en cinco comunidades de la Region Autonoma del Atlantico Norte en Nicaragua, mediante la aplicacion de dos...

  5. Evaluacion del impacto del aprendizaje basado en proyectos en cursos de ingenieria utilizando analisis de correspondencias multiples

    National Research Council Canada - National Science Library

    Fernandez-Samaca, Liliana; Ramirez, Jose M; Vasquez, Jesus E

    2013-01-01

    Este articulo presenta una experiencia sobre la evaluacion del impacto del aprendizaje basado en proyectos en cursos de ingenieria mediante el uso de analisis de correspondencias multiples y agrupacion jerarquica...

  6. Test gestaltico visomotor de bender modificado y test de caras: una evaluacion de la validez de constructo

    National Research Council Canada - National Science Library

    Merino Soto, Cesar

    2011-01-01

    La investigacion con las nuevas versiones del Test Gestaltico de Bender (TGB) apenas ha llamado la atencion en el mundo hispano, considerando que esta prueba es una de las mas utilizadas en la evaluacion psicologica...

  7. Analisis y resultados de un modelo de evaluacion, apoyo y mejora de proyectos empresariales impulsados por jovenes emprendedores

    National Research Council Canada - National Science Library

    Revuelto Taboada, Lorenzo; Fernandez Guerrero, Rafael

    2009-01-01

    .... Este trabajo tiene como objetivo avanzar en la mejora de los sistemas de evaluacion de programas de ayuda a emprendedores y mostrar como las mejoras introducidas pueden tener efectos sobre la calidad...

  8. Method of Automated Dynamic Assessment of reading literacy for Secondary Education (EdilLEC)/'Metodo de evaluacion dinamica automatizado' de competencias lectoras para educacion secundaria (EdiLEC)

    National Research Council Canada - National Science Library

    Perez, Ramiro Gilabert; Lloria, Amelia Mana; Pelluch, Laura Gil; Tatay, Ana C. Llorens; Clemente, Vicenta Avila; Gamez, Eduardo Vidal-Abarca

    2016-01-01

    .... Keywords reading literacy; PISA; dynamic assessment; Secondary Education Se presenta un nuevo metodo de evaluacion dinamica de la competencia lectora automatizado para educacion secundaria (EdiLEC...

  9. Correlação entre os índices dopplervelocimétricos da veia cava inferior e ducto venoso e a concentração de hemoglobina do cordão em fetos de gestantes isoimunizadas

    Directory of Open Access Journals (Sweden)

    Taveira Marcos Roberto

    2003-01-01

    Full Text Available OBJETIVO: o objetivo principal desse estudo foi verificar se existe correlação entre os índices dopplervelocimétricos da veia cava inferior e do ducto venoso e a concentração sérica da hemoglobina fetal. MÉTODOS: estudo transversal e prospectivo, realizado entre janeiro de 1998 e junho de 2001. Foram acompanhadas 31 gestantes isoimunizadas com resultado do teste de Coombs indireto maior que 1:8, que foram submetidas à pesquisa de hemólise fetal. Quando foram indicadas as transfusões intra-uterinas intravasculares, a hemoglobina do cordão foi dosada no início do procedimento. Nos demais casos, a hemoglobina do cordão foi mensurada no momento do parto, sempre por cesariana eletiva. Obteve-se um total de 74 procedimentos estudados, definidos como sendo cada transfusão intra-uterina precedida pela dopplervelocimetria venosa. A mensuração da concentração da hemoglobina fetal foi realizada no Hemocue® (B-Hemoglobin Photometer Hemocue AB; Angelholm, Sweden, dispositivo usado para a determinação quantitativa de hemoglobina no sangue. A dopplervelocimetria da cava inferior e do ducto venoso foi realizada antecedendo a coleta do sangue fetal, sempre em intervalo de tempo inferior a 24 horas. Os índices dopplervelocimétricos estudados foram o índice de pulsatilidade para veias (IPV, o índice do pico de velocidade para veias (IPVV e a relação entre o pico de velocidade durante a fase de contração atrial e o pico de velocidade na sístole ventricular (relação CA/SV ou índice de pré-carga, na veia cava inferior, e o IPV, IPVV e a relação entre os picos de velocidade da sístole ventricular e da contração atrial (relação SV/CA, no ducto venoso. Foi realizado estudo de correlação entre a dopplervelocimetria da veia cava inferior e do ducto venoso e a hemoglobina do cordão, pela técnica de regressão linear simples. Realizou-se também estudo de associação entre os índices dopplervelocimétricos do compartimento

  10. Necrose do coto do ducto cístico após colecistectomia videolaparoscópica Post-videolaparoscopy cholecystectomy necrosis of the cystic duct

    Directory of Open Access Journals (Sweden)

    Daniel Santos Maia

    2010-03-01

    Full Text Available INTRODUÇÃO: Lesões das vias biliares, embora não frequentes, podem ser visualizadas ou percebidas no ato operatório. Porém, as derivadas de necrose por manipulação são tardias e não reconhecíveis durante a operação. RELATO DO CASO: Paciente submetida à colecistectomia videolaparoscópica apresentou coleperitônio no pós-operatório. Em re-operação observou-se ducto cístico fistuloso no local da clipagem dupla. Realizada drenagem intra-cística. Evoluiu com bilioma associado que necessitou também de drenagem por aspiração. Evoluiu satisfatoriamente e com cura em um mês. CONCLUSÃO: Por ser uma situação rara, ainda não existe consenso sobre suas principais causas e incidência.BACKGROUND: Biliary iatrogenic lesions in cholecistectomies are not frequent, but can be treated at the same procedure, if recognized. Necrotic lesion, by the other hand, no. CASE REPORT: Woman submitted to videolaparoscopic cholecystectomy presented, on early follow-up, acute peritonitis due to necrosis of cystic duct on the clips site. Was operated to drain the duct through the introduction of a nasogastric tube inserted in cystic ostium in the necrotic area. Drainage of a bilioma in the epigastrium was also needed after one week, guided by ultrasound. The case had good evolution in one month. CONCLUSION: Due to the rare condition, the management of biliary fistula in necrotic area remains controversial.

  11. Aneurisma do ducto arterioso associado a interrupção do arco aórtico Aneurysm of the arterial duct associated to aortic arch interruption

    Directory of Open Access Journals (Sweden)

    Paulo Zielinsky

    1998-07-01

    Full Text Available É relatado um caso de aneurisma de ducto arterioso, com diagnóstico pré-natal, o que é muito raro, numa gestante com 33 semanas, onde o feto apresentou uma dilatação aneurismática do canal arterial, com calibre uniformemente aumentado, inserindo-se na aorta descendente, associado à interrupção do arco aórtico. A criança nasceu de parto cesáreo e manteve-se estável com o uso de prostaglandina até o 9º dia de vida, quando foi levada à cirurgia, tendo falecido durante o procedimento por falência biventricular. Este é o primeiro relato da associação desta anomalia com outra malformação cardiovascular intra-uterina, mostrando que este achado nem sempre é associado a uma evolução benigna.Aneurysm of the arterial duct is an infrequent finding, which is very rarely detected prenatally. A case of antenatal diagnosis in a pregnant patient (33 weeks is reported. The fetus presented an aneurysmatic dilation of the arterial duct with uniformly enlarged diameter, inserting into the descending aorta, which was interrupted. The neonate was born by cesarean section and was kept on postaglandins till the 9th day of life, when he was sent to surgery. During the surgical procedure, the baby died as a result of biventricular failure. This is the first report of prenatal association of aneurysm of the ducts anteriosus with other cardiovascular malformations and emphasizes that this finding does not always have a benign course.

  12. TOPOGRAFIA DAS ABERTURAS DOS DUCTOS PAROTÍDICOS DE UM LOBO GUARÁ (Chrysocyon brachyrus ILLIGER, 1811 TOPOGRAPHY OF THE OPENINGS OF THE PAROTIDICS DUCTS OF A "GUARA" WOLF (Chrysocyon brachyrus ILLIGER, 1811

    Directory of Open Access Journals (Sweden)

    André Luiz Quagliatto Santos

    2001-04-01

    Full Text Available Estudou-se a topografia dos pontos de abertura dos ductos parotídicos no vestíbulo da boca de um lobo guará (Chrysocyon brachyrus, fêmea, adulto, proveniente do Zoológico do Parque do Sábia, da cidade de Uberlândia, Minas Gerais, Brasil. Realizaram-se incisões horizontais nas paredes do vestíbulo da boca, a cada lado, até um ponto das comissuras labiais que permitiam a identificação das aberturas dos ductos parotídicos, bem como suas relações com as faces vestibulares dos dentes pré-molares e molares superiores. Nessa oportunidade, pôde-se observar que, nesse animal, os ductos parotídicos abrem-se em correspondência ao primeiro dente molar superior.Topography of the opening points of the parotid ducts into the vestibule of the mouth from a female adult "guara" wolf (Chrysocyon brachyrus coming from the Sabiá Park Zoo in the city of Uberlândia, Minas Gerais, Brazil, was studied. Horizontal incisions were performed on the walls of the vestibule of the mouth on each side up to the point of the labial comissure that allowed the identification of the parotid duct openings as well as its relationships with the vestibular surface of the pre-molar and upper molar teeth. In this opportunity, it could be observed that, in this animal, the parotid ducts open into in correspondence to the upper first molar tooth.

  13. Fast techniques for the evaluation of reservoirs capacity; Metodos de evaluacion rapida de capacidad de yacimentos

    Energy Technology Data Exchange (ETDEWEB)

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

    1995-05-01

    Fast techniques for the evaluation of geothermal reservoirs allow us to have an approach of its electrical potential. Based on the laws of conservation of mass and energy, considering infinite permeability, this paper presents techniques for fast reservoir evaluation. These techniques let us calculate in a very practical way, the electric power that can be obtained from a geothermal field. These techniques can be an important tool to solve practical problems, and are useful during the preliminary development of geothermal sources. [Espanol] Los metodos de evaluacion rapida de yacimientos permiten estimar de manera aproximada la potencia electrica maxima y minima de los mismos. Se presentan tecnicas de evaluacion basadas en las leyes de conservacion de masa y energia, considerando permeabilidad infinita. Las tecnicas utilizadas pueden ser una herramienta importante para la solucion de problemas practicos y para la toma de decisiones en etapas de prefactibilidad.

  14. Sazonalidade dos ductos secretores e óleo essencial de Foeniculum vulgare var. vulgare Mill. (Apiaceae Seasonality of the secretory ducts and essential oil of Foeniculum vulgare var. vulgare Mill. (Apiaceae

    Directory of Open Access Journals (Sweden)

    L.A. Sousa

    2005-06-01

    Full Text Available Este trabalho teve como objetivo analisar os ductos secretores e o óleo essencial das folhas de Foeniculum vulgare em diferentes épocas do ano. Para esta finalidade, foram realizados estudos de caracterização anatômica, bem como anatomia comparada dos ductos secretores e testes histoquímicos das folhas. O óleo essencial foi obtido de folhas e frutos, por hidrodestilação em aparelho de Clevenger e analisados quantitativamente e qualitativamente por cromatografia em fase gasosa acoplada ao espectrômetro de massa, realizando-se análises seguidas de três réplicas para folhas coletadas durante o inverno e primavera, e frutos no verão. Os resultados encontrados para os ductos secretores de óleo corresponderam à redução do teor de óleo essencial nas folhas coletadas no final da primavera. O componente majoritário do óleo essencial de folhas e frutos foi o trans-anetol, durante todas as estações do ano. Portanto, evidenciou-se que os ductos secretores e teor de óleo essencial estão relacionados, bem como os constituintes químicos também estão sujeitos a sazonalidade, conforme o estágio fenológico da planta.This work aimed to analyze the secretory ducts and the essential oil of the leaves of Foeniculum vulgare in different periods of the year. For this purpose, the anatomic characterization, and histochemical tests of the leaves were performed as well as the comparative anatomy of the secretory ducts. The essential oil was obtained from the leaves and fruits by hidrodistillation in a Clevenger-type apparatus and analyzed by gas chromatography coupled to a mass spectrometer, each analysis was repeated three times for leaves collected during the winter and spring, and for fruits collected in the Summer. The results obtained for the secretory ducts, corresponded to the yield reduction of essential oil in the leaves collected in the end of the spring. The major substance of the essential oil of the leaves and fruits, in all

  15. Avaliação de índices dopplerfluxométricos da veia cava inferior e do ducto venoso em fetos submetidos à transfusão intravascular

    OpenAIRE

    Lopes Ana Paula Brum Miranda; Rezende Cézar de Alencar de Lima; Cabral Antônio Carlos Vieira; Leite Henrique Vitor

    2002-01-01

    OBJETIVO: avaliar os efeitos da transfusão intravascular nos índices dopplerfluxométricos do ducto venoso e da veia cava inferior (SV/CA) e relacionar essas alterações com o nível de hemoglobina pré-transfusão intravascular. MÉTODOS: trata-se de estudo transversal prospectivo. Foram realizadas 62 transfusões intravasculares em 27 fetos de gestações complicadas por isoimunização materno-fetal. Os 62 casos foram divididos em dois grupos: (A) fetos com níveis de hemoglobina pré-transfusão £...

  16. Energy evaluation process of electric domestic refrigerators; Proceso de evaluacion energetica de refrigeradores electrodomesticos

    Energy Technology Data Exchange (ETDEWEB)

    Malacara Toral, Manuel; Ruiz Neblina, Joaquin [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1992-12-31

    A description is made of an energy evaluation study on electric domestic refrigerators carried out by the Instituto de Investigaciones Electricas (IIE), in its strategy for diminishing the energy consumption through the design enhancement, the manufacture, the operation and the standardization of the electric appliances. In order to initiate the evaluation-standardization process, the Mexican (NOM), the American (ANSI/AHAM) and the Canadian (CAN/CSA) standards were taken as a base to harmonize the procedures and the parameters of the tests. The energy assessment demonstrated that there are significant differences among the standards encompassed by the study, therefore, recommendations were made for the harmonization of the standards. [Espanol] Se describe un estudio de evaluacion energetica sobre refrigeradores electrodomesticos realizado en el Instituto de Investigaciones Electricas (IIE) dentro de la estrategia para disminuir los consumos de energia a traves de mejoras en el diseno, la manufactura, la operacion y la normalizacion de equipos electricos. Se tomo como base las normas mexicanas (NOM), americana (ANSI/AHAM) y canadiense (CAN/CSA) para iniciar el proceso de evaluacion-normalizacion a fin de armonizar los procedimientos y parametros de las pruebas. La evaluacion energetica demostro que existen diferencias significativas entre las normas que abarco el estudio por lo que se presentan recomendaciones para la armonizacion de las normas.

  17. La calidad de las evaluaciones de manuscritos en Gaceta Sanitaria Quality of manuscript evaluation in Gaceta Sanitaria

    Directory of Open Access Journals (Sweden)

    A.M. García

    2002-06-01

    Full Text Available Objetivo: Describir las cualidades y limitaciones de las evaluaciones externas de los manuscritos remitidos a Gaceta Sanitaria para mejorar la selección de los evaluadores, aumentar la calidad de las evaluaciones y establecer un sistema interno que pudiera incorporarse al proceso editorial de gestión de los manuscritos. Métodos: Se incluyeron 100 evaluaciones de 55 manuscritos recibidos durante los años 2000 y 2001. Se aplicó un formulario de preguntas cerradas en el que se valoraban aspectos específicos y generales de calidad en las evaluaciones (respuestas sí/no o sobre una escala de 1 a 5. Se llevó a cabo un análisis descriptivo y de correlación entre los distintos ítems del formulario. Se calculó un Índice de Calidad como suma de las puntuaciones de los ítems específicos. Resultados: Las evaluaciones obtuvieron puntuaciones más elevadas en relación con la compleción del formulario para los revisores (84%, la utilización de un tono constructivo con los autores (evaluaciones por encima de 3: 63%, la identificación de cualidades y limitaciones metodológicas (evaluaciones por encima de 3: 59% y la fundamentación de los comentarios del evaluador (evaluaciones por encima de 3: 58%. Con menor frecuencia, se valora la relevancia (evaluaciones por encima de 3: 40% o la originalidad (evaluaciones por encima de 3: 35% del manuscrito. La utilidad global de la evaluación para el editor y la calidad global de la evaluación mostraron una elevada correlación con el resto de ítems específicos en el formulario y con el Índice de Calidad. Conclusiones: La calidad general de las evaluaciones externas de manuscritos en Gaceta Sanitaria se puede considerar alta. Se ponen de manifiesto los aspectos mejorables de las evaluaciones. Se podría establecer un proceso sistemático de valoración de las evaluaciones externas utilizando indicadores simples como la valoración global de la utilidad o de la calidad de la evaluación en su

  18. Representaciones sociales sobre el proceso evaluacion desde la mirada de docentes de 1 ano basico en establecimientos municipalizados urbanos de la comuna de Quilpue

    National Research Council Canada - National Science Library

    Torres, Ana Maria

    2013-01-01

    .... Se identificaron factores emocionales de las docentes que favorecen el proceso evaluacion-logros de aprendizajes y otros que involucran riesgo de un desgaste profesional. Se constato que la decision de repitencia es tomada a partir de concepciones que van mas alla de los bajos logros de aprendizaje. Finalmente, se concluyen condiciones para mejorar procedimientos de evaluacion en 1 Ano Basico.

  19. Morbimortalidade relacionada à técnica de anastomose pancreática (ducto-mucosa x telescopagem após cirurgia de Whipple Morbimortality related to pancreatic anastomosis technique (duct-to-mucosa vs. telescopic after Whipple's surgery

    Directory of Open Access Journals (Sweden)

    Jorge Mali Junior

    2005-04-01

    Full Text Available OBJETIVOS: A gastroduodenopancreatectomia (GDP é atualmente a única forma de tratamento segura e eficaz para pacientes selecionados com doenças benignas e malignas do pâncreas e da região periampular. Entre as complicações pós-operatórias, a fístula pancreática continua sendo a mais importante, com uma incidência que varia de 5 a 25% nas grandes séries. Os objetivos deste trabalho são os de avaliar a morbimortalidade relacionada a duas técnicas de anastomoses pancreatojejunais (ducto-mucosa X telescopagem, e comparar seus resultados. MÉTODO: Foram analisados retrospectivamente 64 pacientes submetidos à GDP, no Serviço de Cirurgia Abdômino-Pélvica, do INCA, no período de 1987 a 2002. Destes doentes, 42 foram submetidos à anastomose tipo ducto-mucosa e 22 à telescopagem. A análise estatística foi realizada através do teste de Fischer. RESULTADOS: A taxa de fístula pancreática no grupo ducto-mucosa foi de 12% e no telescopagem foi 36%. Esta diferença percentual se mostrou estatisticamente significativa (p = 0,02. A mortalidade operatória relacionada à fístula pancreática foi de 2,4% para o grupo ducto-mucosa e 4,5% para o telescopagem, com nível de significância estatística > 5%. CONCLUSÕES: A técnica de anastomose pancreatojejunal tipo ducto-mucosa é associada a menores índices de fístula pancreática em relação a técnica de telescopagem, enquanto que a mortalidade operatória relacionada a fístula não mostrou diferença estatística entre os dois grupos estudados.BACKGROUND: Pancreaticoduodenectomy has been used as a safe and appropriate surgical option in selected patients with malignant and benign disorders of the pancreas and periampullary region. Among the complications of the pancreatoduodenectomy, pancreatic anastomosis failure is the most important and sometimes fatal complication. According to recent reports, the incidence of leakage of pancreatic anastomosis after PD is high (between 5% and

  20. Fluxo no ducto venoso e na veia cava inferior dos fetos em gestações isoimunizadas Assess flow velocity in the ductus venosus and inferior vena cava in fetuses in isoimmunized pregnancies

    Directory of Open Access Journals (Sweden)

    Eura Martins Lage

    2006-10-01

    Full Text Available OBJETIVO: Avaliar a velocidade de fluxo na veia cava inferior e no ducto venoso em fetos, nas gestações isoimunizadas. MÉTODOS: De junho de 1999 a junho de 2004, foram avaliados 61 fetos, entre 27 e 35 semanas, de gestantes portadoras de isoimunização por antígenos eritrocitários. Em todos os fetos foram avaliadas as velocidades de fluxo na veia cava inferior e no ducto venoso. Obteve-se amostra de sangue fetal para determinação dos valores da hemoglobina e calculou-se o déficit da concentração de hemoglobina. Esses fetos foram divididos em quatro grupos, de acordo com o déficit da concentração de hemoglobina: fetos não anêmicos, anêmicos leves, anêmicos moderados e anêmicos graves. Utilizou-se o teste Qui-quadrado para comparar os quatro grupos de fetos quanto à proporção da alteração da velocidade média de fluxo na veia cava inferior e no ducto venoso. RESULTADOS: A velocidade de fluxo na veia cava inferior estava alterada em 3,8% dos fetos não anêmicos, em 3,1% dos fetos com anemia leve, em 40% dos anêmicos moderados e em 76% dos fetos com anemia grave. Já a velocidade de fluxo no ducto venoso estava alterada em 7,7% dos fetos não anêmicos, em 3,1% dos fetos com anemia leve, em 32,5% dos anêmicos moderados e em 68% dos fetos com anemia grave. O valor p foi inferior a 0,001. CONCLUSÃO: Verificou-se aumento da freqüência de alteração da velocidade de fluxo na veia cava inferior e no ducto venoso à medida que a anemia se agravava.OBJECTIVE: Ductus venosus and inferior vena cava flow velocity was assessed in fetuses in isoimmunized pregnancies. METHODS: Examination of 61 fetuses aged 27 to 35 weeks from Rh-erythrocyte antigen isoimmunized women was carried out from June 1999 to June 2004. All fetuses were submitted to the examination of ductus venosus and inferior vena cava flow velocity. Blood samples were collected to determine hemoglobin values and hemoglobin concentration deficits. Accordingly, fetuses

  1. Consideraciones de las propiedades mecánicas y térmicas para la elaboración de un ducto de riego a partir de materiales poliméricos postconsumo

    Directory of Open Access Journals (Sweden)

    Mary Luz Barrios-Hernández

    2014-09-01

    Como principal resultado se obtuvo que la formulación que mejoró las propiedades estudiadas del poliducto fue la mezcla de diferentes productos de Polietileno de Baja Densidad postconsumo, para un total de 10 repeticiones con 95% de confianza en la prueba de Kolmogorov-Smirnov, concluyendo que este producto supera las propiedades de resistencia en elongación y flexión y que necesita la optimización de las características para resistencia al impacto modo IZOD. Además, la prueba de calorimetría diferencial de barrido demostró la ausencia de agentes externos en la muestras y el análisis termogravimétrico reveló cambios de temperatura de descomposición semejantes al ducto y mayores a las otras mezclas.

  2. Evaluacion sensorial de arroz biofortificado, variedad IDIAP Santa Cruz 11, en granjas autosostenibles del Patronato de Nutricion en la Provincia de Cocle, Panama

    National Research Council Canada - National Science Library

    Camargo Buitrago, Ismael; Henriquez, Teresita; Montenegro, Salvador; Vergara de Caballero, Eira; Espinosa, Juan; Vergara, Omaris; Mojica de Torres, Eyra

    2011-01-01

    .... En cada comunidad 30 madres de familias participaron en la evaluacion. Para el analisis sensorial se utilizo la prueba discriminativa triangular, en la que las madres de familia debian identificar la muestra...

  3. Evaluacion de las condiciones de mezcla y su influencia sobre el cloro residual en tanques de compensacion de un sistema de distribucion de agua potable

    National Research Council Canada - National Science Library

    Montoya, C; Cruz, C.H; Torres, P; Lain, S; Escobar, J.C

    2012-01-01

    Se llevo a cabo una evaluacion a escala real de las condiciones de mezcla y su influencia sobre la calidad del agua en un tanque de compensacion del sistema de distribucion de agua potable de la ciudad de Cali (Colombia...

  4. Dopplervelocimetria do ducto venoso na predição da acidemia fetal Ductus venosus Doppler velocimetry to predict acidemia at birth in pregnancies with placental insufficiency

    Directory of Open Access Journals (Sweden)

    Francisco Herlânio C. Carvalho

    2005-08-01

    Full Text Available OBJETIVOS: Investigar a possibilidade da predição da acidemia no nascimento mediante dopplervelocimetria do ducto venoso e definir qual o melhor parâmetro e seus pontos de corte nessa predição em gestações com insuficiência placentária. MÉTODOS: Trata-se de estudo transversal e prospectivo que analisou 47 gestações únicas com insuficiência placentária e idade gestacional superior a 26 semanas, realizado no Hospital São Paulo (UNIFESP e na Maternidade-Escola Assis Chateaubriand (UFC. A insuficiência placentária foi diagnosticada quando o índice de pulsatilidade da artéria umbilical encontrava-se acima do percentil 95 para a idade gestacional estimada. Fetos com anomalias estruturais ou cromossômicas foram excluídos. O doppler foi realizado a menos de 24 horas do parto. A amostra de sangue da artéria umbilical foi coletada imediatamente após o nascimento para análise da gasometria. Diagnosticou-se acidemia quando o pH encontrava-se abaixo de 7,20 na ausência de trabalho de parto e abaixo de 7,15 quando parto vaginal. Foram consideradas patológicas as acidemias metabólicas ou mistas. Construiu-se curva ROC para as velocidades S, D e A e para o IPV e as relações S/A e (S-A/S do DV (variáveis independentes e acidemia (variável dependente. O teste de MacNemar foi utilizado para comparar os parâmetros entre si. RESULTADOS: As velocidades absolutas S, D e A mostraram ser pobres preditoras da acidemia no nascimento. O IPV mostrou ser bom preditor de acidemia (área sob a curva ROC 0,79, p=0,003. As relações S/A e (S-A/S também mostraram ser boas preditoras da acidemia (área sob a curva ROC 0,818, p=0,001. Os pontos de corte calculados foram: IPV = 0,76, S/A = 2,67 e (S-A/S = 0,63. CONCLUSÕES: Os índices ângulo-independentes do doppler do DV mostraram excelente correlação com acidemia no nascimento nesta população. Não houve diferença estatisticamene significativa entre estes parâmetros.OBJETIVES: To

  5. Rasgos del temperamento de los perros domésticos (Canis familiaris: evaluaciones conductuales

    Directory of Open Access Journals (Sweden)

    ADRIANA JAKOVCEVIC

    2009-01-01

    Full Text Available Los rasgos del temperamento se definen como tendencias conductuales estables entre situaciones similares y a lo largo del tiempo. En el presente trabajo se revisan las pruebas conductuales diseñadas para la evaluación de rasgos aislados del temperamento en los perros domésticos. Para cada dimensión se describen los estímulos empleados, las respuestas evaluadas y el correlato psiológico de las mismas. Los rasgos más estudiados fueron la temerosidad, la agresividad y la sociabilidad. Sin embargo, sólo la primera cuenta con correlatos psiológicos bien establecidos. Finalmente, las evaluaciones conductuales resultan de suma importancia para la selección de los perros para las distintas funciones que cumplen en la sociedad humana: detección de drogas, compañía, guardia, rescate de personas, etc.

  6. Efeitos da tela de polipropileno no testículo, epidídimo e ducto deferente de cães Effects of the polypropilene mesh in the testicle, epididimus and ductus deferens of dogs

    Directory of Open Access Journals (Sweden)

    Alberto Goldenberg

    2001-12-01

    Full Text Available Objetivo: Investigar os efeitos da tela sintética sobre o testículo, epidídimo e ducto deferente de cães. Métodos: Foram utilizados 10 cães, machos, adultos, pesando entre 9 e 12 kg. Os animais, após realizada anestesia, foram submetidos à laparoscopia com formação de pneumoperitônio por incisão em linha mediana. Era então fixada tela de polipropileno, de dimensões 2,5X3,5 cm² na região inguinal esquerda do cão em contato direto com o funículo espermático, com o uso de grampos metálicos, sem dissecar a região. O lado direito, sem colocação de tela, serviu de controle. O procedimento tinha duração de 15 minutos. Após observação pós-operatória de 30 dias, os animais eram novamente anestesiados e reoperados sendo o testículo e ducto deferente retirados e enviados para análise histológica. Análise estatística foi realizada com os dados obtidos desta análise. Resultados: No lado esquerdo, as secções histológicas de testículo revelaram focalmente, diminuição da espermatogênese e processo degenerativo em 20% dos animais. No epidídimo, observou-se inflamação crônica e dilatação dos túbulos seminíferos em 70%. No ducto deferente foi observado processo inflamatório crônico em 60% dos cães. Não foram verificadas alterações histológicas no lado contralateral. Conclusão: A tela de polipropileno em contato com o funículo espermático de cães provoca alterações histológicas com discreta redução da espermatogênese.The aim of this study was to investigate the effects of the synthetic mesh on the ductus deferens and testicle of dogs. Ten adult male dogs were anesthetized and a 2,5X3,5 cm² polypropilene mesh was fixed in the inguinal region in direct contact with the ductus deferens, using metallic staples without dissection of the region and therefore, without manipulation. The right side, with no mesh was the control. . The operative time was 15 minutes. The animals were observed for 30 days and

  7. Evaluation of the useful life of steam turbine rotors; Evaluacion de vida util de rotores de turbinas de vapor

    Energy Technology Data Exchange (ETDEWEB)

    Carnero Parra, Antonio; Garcia Illescas, Rafael; Kubiak Szyszka, Janusz [Instituto de Investigaciones Electricas, Temixco, Morelos (Mexico)

    1999-07-01

    This article presents the methodology applied by the Management of Turbomachinery of the Institute of Investigaciones Electricas (IIE), for the evaluation of the remaining useful life of steam turbine rotors in the phase of initiation of fissures. The evaluation of the remaining useful life of turbines, will reveal the real state of health of the rotor and will serve as a base for the future decision making that guarantees their structural integrity. [Spanish] El presentes articulo presenta la metodologia aplicada por la Gerencia de Turbomaquinaria del Instituto de Investigaciones Electricas (IIE), para la evaluacion de la vida util remanente de rotores de turbinas de vapor en la fase de iniciacion de fisuras. La evaluacion de la vida util de turbinas, revelar el estado real de salud del rotor y servira de base para la toma de decisiones futuras que garanticen su integridad estructural.

  8. Dilatação por cateter-balão (dacrioplastia para tratamento das obstruções congênitas do ducto lacrimonasal Balloon-catheter dilatation (dacrioplasty for congenital nasolacrimal duct obstruction treatment

    Directory of Open Access Journals (Sweden)

    Roberto Murillo Limongi de Souza Carvalho

    2009-10-01

    Full Text Available OBJETIVO: Verificar o resultado da técnica, inédita no Brasil, de dilatação do ducto lacrimonasal usando cateter-balão para tratamento da obstrução congênita do ducto lacrimonasal. MÉTODOS: Foram tratadas crianças com idade entre dois e cinco anos, com obstrução congênita de vias lacrimais usando o cateter-balão (Lacricath® para dilatação das vias lacrimais. O cateter foi introduzido pelo ponto lacrimal superior, sob anestesia geral. RESULTADOS: Entre os 27 olhos tratados, 23 apresentaram desaparecimento dos sinais e sintomas de lacrimejamento (taxa de sucesso de 85,2%. Todos os procedimentos foram realizados sem intercorrências e o seguimento pós-operatório mínimo foi de um ano. CONCLUSÃO: A dilatação com balão mostrou-se segura e eficiente como primeiro procedimento para os casos de obstrução congênita das vias lacrimais em crianças com mais de dois anos.Purpose: To verify the results of balloon-catheter dilatation for the treatment of congenital lacrimal duct obstruction. To the best of author's knowledge this procedure has not been previously used in Brazil and deserves scientific studies. METHODS: Children between 2 and 5 years old, with congenital lacrimal duct obstruction, were treated with balloon-catheter dilatation (Lacricath®. Catheter was introduced by the superior lacrimal punctum, under general anesthesia. RESULTS: Twenty-seven eyes were treated and 23 presented total improvement of epiphora signs and symptoms (85.2% success rate. During a one year follow-up, all the procedures had good outcomes, without complications and all the children had 1 year of follow-up. CONCLUSION: Balloon-catheter dilatation is an efficient and safe procedure and might be used for congenital lacrimal duct obstruction treatment in children older than 2 years.

  9. Ligadura de ducto biliar como modelo de estudo da síndrome hepatopulmonar e estresse oxidativo Common bile duct ligation as a model of hepatopulmonary syndrome and oxidative stress

    Directory of Open Access Journals (Sweden)

    Juliana Tieppo

    2005-12-01

    Full Text Available RACIONAL: A síndrome hepatopulmonar é caracterizada por uma disfunção hepática e pela existência de dilatações dos vasos pulmonares, levando a alterações nas trocas gasosas, tendo algumas das suas características observadas de forma experimental no modelo de ligadura de ducto biliar. OBJETIVOS: Avaliar o estresse oxidativo no tecido pulmonar de ratos cirróticos por ligadura de ducto biliar comum. MATERIAIS E MÉTODOS: Foram utilizados 12 ratos machos Wistar, pesando entre 200 e 300 g, divididos em dois grupos: controles (Co = 6 e cirróticos (Ci = 6. Foram realizadas avaliações de transaminases, gasometria arterial, avaliação da lipoperoxidação (substâncias reativas ao ácido tiobarbitúrico e quimiluminescência e quantificação da atividade enzimática antioxidante através das concentrações da enzima superóxido dismutase. Os tecidos analisados para avaliação da síndrome hepatopulmonar foram o fígado cirrótico e o pulmão. RESULTADOS: Os animais com ligadura de ducto biliar apresentaram alteração nas transaminases: aspartato aminotransferase, Co = 105,3 ± 43/Ci = 500,5 ± 90,3 alanina aminotransferase, Co = 78,75 ± 37,7/Ci = 162,75 ± 35,4 e fosfatase alcalina, Co = 160 ± 20,45/Ci = 373,25 ± 45,44. Em relação à lipoperoxidação e à resposta antioxidante, estas também apresentaram diferenças estatisticamente significativas quando avaliadas no pulmão (substâncias reativas ao ácido tiobarbitúrico Co = 0,87 ± 0,3/Ci = 2,01 ± 0,9; quimiluminescência Co = 16008,41 ± 1171,45/Ci = 20250,36 ± 827,82; superóxido dismutase Co = 6,66 ± 1,34/Ci = 16,06 ± 2,67. CONCLUSÕES: Os dados obtidos sugerem que no modelo experimental de cirrose por ligadura de ducto biliar há aumento significativo da lipoperoxidação no tecido pulmonar, bem como aumento na atividade da enzima antioxidante superóxido dismutase, sugerindo a presença de dano pulmonar decorrente da cirrose biliar secundária.BACKGROUND: The

  10. Integral power evaluation in fossil fuel power plants; Evaluacion energetica integral en unidades de centrales termoelectricas

    Energy Technology Data Exchange (ETDEWEB)

    Figueroa I, Luis R; Sanchez H, Laura E; Rodriguez M, Jose H [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico); Nebradt G, Jesus [Unidad de Investigacion y Desarrollo de la Subdireccion de Generacion de la Comision Federal de Electricidad, (Mexico)

    2006-07-01

    In this occasion, a methodology is presented that carries out an integral energy evaluation of fossil fuel power plants units (FFPPU) with the purpose of determining the root of the significant decrements of power produced soon after the annual maintenance service. This proposal, besides identifying the origin of the energy efficiency problems, offers information about the contributions of each one of the involved equipment in the total decrement of the unit. With this methodology, the maintenance focuses in the equipment that contributes to the greater energy loss. This document presents such methodology along with its application in a real case, results and necessary remedial actions, demonstrating that its application offers bases for the investment in corrective measures. [Spanish] En esta ocasion se presenta una metodologia que efectua una evaluacion energetica integral de las unidades de centrales termoelectricas (UCT) con el fin de determinar la raiz de los decrementos de potencia significativos producidos luego del servicio anual de mantenimiento. Dicha propuesta, ademas de identificar el origen de los problemas de eficiencia energetica, brinda informacion acerca de las aportaciones de cada uno de los equipos involucrados al decremento total de la unidad. Con esta metodologia, el mantenimiento se enfoca a los equipos que contribuyen a la mayor perdida de potencia. Este documento exhibe tal metodologia junto con su aplicacion en un caso real, resultados y las acciones correctivas necesarias, demostrando que su aplicacion ofrece bases para una inversion futura en medidas correctivas.

  11. ANÁLISIS DE CORROSIÓN EN DUCTOS DE CONDUCCIÓN DE GASES EN UNA PLANTA DE CLINKER CORROSION ANALYSIS IN GAS CONDUCTION DUCTS IN A CLINKER PLANT

    Directory of Open Access Journals (Sweden)

    Alex Humberto Restrepo Carvajal

    2009-04-01

    Full Text Available En este trabajo se presentan los resultados de un estudio detallado de las causas del deterioro observado en ductos metálicos de una planta productora de cemento. Para el análisis, se inició con una minuciosa inspección visual, tomando muestras de sustratos, productos de corrosión y gases de proceso. Al mismo tiempo se realizaron medidas de potencial de estructura, espesores de pared y temperaturas de superficies. Para la evaluación de la agresividad del ambiente se instalaron captadores de contaminantes (cloruros, sulfatos y óxidos de nitrógeno. Las muestras recolectadas se analizaron por medio de microscopia óptica y electrónica de barrido, espectroscopia EDS, difracción de rayos X, espectroscopia infrarroja y cromatografía iónica. Los gases se analizaron insitu siguiendo el procedimiento EPA-2. Los resultados para las superficies externas indican una atmósfera con agresividad C3 según la norma ISO 9223, observando influencia de la alta temperatura, largos periodos de humectación, material particulado y errores en la selección del sistema de protección. Las capas de productos al exterior son uniformes, compactas y son compuestas principalmente por hematita. Al interior de los ductos se presentan procesos de sulfurización y oxidación; el ataque por azufre es localizado y genera perforación de las paredes metálicas. Los productos encontrados son mayormente sulfatos de hierro y Fe2O3. Los procedimientos empleados y los resultados obtenidos son útiles para la toma de decisiones en mantenimiento y protección contra la corrosión de este tipo de instalaciones.The results of a detailed study of the causes of deterioration, observed in metallic ducts in a cement production plant are presented. The analysis started with a careful visual inspection, collecting samples of substrates, corrosion products and process gases. At the same time, measurements of potential, wall thickness and surface temperatures were carried out. For

  12. Relaxant effect of the aqueous extract of Erythrina vellutina leaves on rat vas deferens Efeito relaxante do extrato aquoso das folhas de Erythrina vellutina em ducto deferente de rato

    Directory of Open Access Journals (Sweden)

    Márcio R. V. Santos

    2007-09-01

    Full Text Available The effect of the Aqueous Extract from the leaves of Erythrina vellutina (AE on rat vas deferens preparation was evaluated in this work. The AE inhibited the muscle contractions induced by electrical field stimulation (EFS in a concentration-dependent manner. This inhibition was not affected by atropine (10-5M, propanolol (10-5M, prazosin (10-5M or yohimbine (10-5M, suggesting that there is no direct interaction of the AE with cholinergic nor adrenergic receptors. Incubation of vas deferens with the K+ channel antagonists, tetraethylamonium (10-6M or 4-aminopyridine (10-6M had also no effect on the AE-induced inhibition. On the other hand, glibenclamide (10-6 significantly attenuated the effect of the AE, suggesting a possible involvement of ATP-dependent K+ channels. The AE (0.15 mg/mL did not alter the contractions induced by noradrenaline (10-5M, ATP (10-4M nor KCl (80 mM, against an interaction of the extract with post-synaptic sites. The data presented suggests that the inhibition of the electrically driven muscle twitches by the AE could be due to a pre-synaptic interaction of the extract with ATP-dependent K+ channels from vas deferens sympathetic neurons.O objetivo deste trabalho foi avaliar o efeito do extrato aquoso das folhas de Erythrina vellutina (AE sobre ducto deferente de rato. Nesta preparação, o AE inibiu as contrações induzidas por estímulo elétrico de campo de maneira dependente da concentração. Esta inibição não foi afetada após atropina (10-5M, propanolol (10-5M, prazosin (10-5M ou yohimbina (10-5M, sugerindo uma ação indireta do AE sobre receptores colinérgicos ou adrenérgicos. A incubação da preparação com os antagonistas de canais de K+, tetraetilâmonio (10-6M ou 4-aminopiridina (10-6M não alterou o efeito inibitório induzido pelo AE. Entretanto, a glibenclamida (10-6M atenuou significantemente este efeito, sugerindo um possível envolvimento de canais de K+ dependentes de ATP. Além disso, o AE (0

  13. Architecture's models: Integral thermal evaluation; Modelos en arquitectura: evaluacion termica integral

    Energy Technology Data Exchange (ETDEWEB)

    Roset, Jaume [Universidad Politecnica de Cataluna, Barcelona (Spain); Marincic, Irene; Ochoa, J. Manuel [Universidad de Sonora, Hermosillo, Sonora (Mexico)

    2000-07-01

    fin, se utilizan modelos que representen tanto la descripcion de los objetos y conceptos arquitectonicos, como las hipotesis sobre su comportamiento espacio-temporal. La cantidad y tipo de informacion que es necesario suministrar a un modelo para hacerlo operativo ha sido, y es, objeto de grandes controversias. La cuestion es: hasta que punto son mas utiles modelos con gran cantidad de entradas que otros mas simples? Entendiendo por modelos simples aquellos que habitualmente contienen cierta cantidad de coeficientes empiricos, lo que reduce el numero de datos, llevando el calculo a una aproximacion. Por otro lado, en el dominio de la arquitectura la informacion se presenta de manera habitual, sobre soportes de diferente tipo (tablas de valores numericos, planos, maquetas, ...). Las informaciones suministradas en cada tipo de soporte deben, necesariamente, ser combinadas de manera que se maximice la informacion contenida sobre el sistema global. En este trabajo, presentamos ejemplos referentes a estudios termicos que hemos realizado sobre diferentes maneras de abordar la evaluacion de modelos variables relacionados con el comportamiento termico de los edificios, la interaccion de estos con el medio ambiente que los rodea y su influencia sobre el confort en el interior de los mismos. Como conclusion general, podriamos decir que un modelo deberia tener las minimas entradas posibles con las cuales abordar los efectos mas significativos, que puedan representar de la manera mas aproximada posible al comportamiento real. Las hipotesis y condiciones de evaluacion de estos efectos deben ser comprendidas y asumidas por el usuario.

  14. RASGOS DEL TEMPERAMENTO DE LOS PERROS DOMÉSTICOS (CANIS FAMILIARIS: EVALUACIONES CONDUCTUALES

    Directory of Open Access Journals (Sweden)

    ADRIANA JAKOVCEVIC

    2009-08-01

    Full Text Available

    Los rasgos del temperamento se definen como tendencias conductuales estables entre situaciones similares y a lo largo del tiempo. En el presente trabajo se revisan las pruebas conductuales diseñadas para la evaluación de rasgos aislados del temperamento en los perros domésticos. Para cada dimensión se describen los estímulos empleados, las respuestas evaluadas y el correlato fisiológico de las mismas. Los rasgos más estudiados fueron la temerosidad, la agresividad y la sociabilidad. Sin embargo, sólo la primera cuenta con correlatos fisiológicos bien establecidos. Finalmente, las evaluaciones conductuales resultan de suma importancia para la selección de los perros para las distintas funciones que cumplen en la sociedad humana: detección de drogas, compañía, guardia, rescate de personas, etc.

  15. VISIÓN Y OLFATO EN LAS EVALUACIONES DE ATRACTIVO QUE HACEN HOMBRES HOMOSEXUALES

    Directory of Open Access Journals (Sweden)

    JOSÉ MARÍA JIMÉNEZ ORVAÑANOS

    2013-01-01

    Full Text Available Las investigaciones sobre el papel de los sentidos en la elección de pareja que hacen hombres y mujeres han confirmado la presencia de procesos a nivel neurofisiológico cuya influencia va más allá de las decisiones conscientes que pudieran tomarse en cuanto a la pareja con la que deciden estar. Sin embargo, la mayoría de las investigaciones realizadas hasta ahora tienen un enfoque en parejas heterosexuales y son pocos los estudios que examinan el papel de los sentidos en la elección de pareja que hacen las personas homosexuales. El objetivo del estudio realizado fue evaluar la importancia y la relación que tienen el olfato y la visión en la atracción de hombres homosexuales hacia hombres, tanto hetero como homosexuales. Un grupo de 14 hombres homosexuales evaluó el atractivo de fotografías y camisetas (remera de algodón de mangas cortas provenientes de hombres hetero y homosexuales. Los resultados indicaron que el olor de las camisetas utilizadas por hombres homosexuales resultó significativamente más atractivo que el olor de las camisetas utilizadas por hombres heterosexuales en las evaluaciones realizadas. Por otra parte, se realizaron análisis de regresión múltiple y sus resultados mostraron que el atractivo del olor de las camisetas utilizadas por hombres homosexuales predice significativamente el atractivo global de estos hombres. Estos resultados sugieren la presencia de una capacidad en hombres homosexuales para distinguir inconscientemente a hombres heterosexuales de hombres homosexuales a partir de estímulos olfativos, lo que a su vez apunta a una constitución neurofisiológica en particular, invitando a realizar más investigaciones en el tema.

  16. Evaluacion del clima organizacional en la Facultad de Odontologia de la Pontificia Universidad Javeriana desde una perspectiva integradora y participativa.(clima organizacional, Facultad de Odontologia de la Pontificia Universidad Javeriana )

    National Research Council Canada - National Science Library

    Gomez Villamizar, Mariela; Bermudez Gomez, Maria Constanza; Velosa Porras, Juliana; Paez Becerra, Francisco Javier; Ferro Camargo, Maria Beatriz

    2012-01-01

    Objetivo: en este articulo se presentan los resultados de la evaluacion diagnostica del clima organizacional de la Facultad de Odontologia de la Pontificia Universidad Javeriana de Bogota, Colombia. Metodos...

  17. Two-Phase Flow Evaluation in Geothermal Pipelines; Evaluacion de flujos bifasicos en tuberias geotermicas

    Energy Technology Data Exchange (ETDEWEB)

    Del Rio Garcia, Luis [Gerencia de Proyectos Geotermoelectricos de la Comision Federal de Electricidad, Morelia (Mexico)

    1996-01-01

    Pipe transportation of two phase-flow is a common practice in Mexican geothermal fields under commercial exploitation. Steam is separated from water using a centrifugal separator installed nearby a power plant. Afterwards, steam is conduced to the turbine and the water is reinjected into the reservoir. Sometimes the separation equipment are shared by two or more two-phase producing wells, so that the individual mass flow rate of each well is unknown. This paper is concerned with the evaluation of two-phase mass flow rates through sharp edged orifice plates, and attempts to establish the limits of steam quality in order that Murdock`s correlation gives acceptable results. This correlation was experimentally applied to well Az-25 of Los Azufres Geothermal field. In this case the single phase flows were determined after its separation by standard orifice plates (steam) and the weir box method. The results show that the Murdock`s correlation can be used for steam qualities of 50% and higher. [Espanol] El transporte de flujos bifasicos a traves de tuberias es una practica comun en los campos geotermicos mexicanos en la etapa de explotacion comercial. El vapor se separa del agua usando separadores centrifugos instalados en la vecindad de las unidades turbogeneradoras. Despues de esto, el vapor se conduce a las turbinas y el agua es reinyectada al yacimiento. En ocasiones, los equipos de separacion son compartidos por dos o mas pozos que producen flujos en dos fases, por lo que normalmente se desconocen tanto el gasto masico como la evolucion de la produccion de cada pozo. En este trabajo se propone una tecnica util en la evaluacion de flujos bifasicos, empleando placas orificio a partir de la correlacion de Murdock y se establece el intervalo de humedad para el cual el metodo proporciona resultados confiables. El metodo de Murdock fue aplicado experimentalmente al pozo Az-25 del campo geotermico de Los Azufres, para calidades de vapor entre 25 y 50%. En este caso los

  18. Utilization of sharp edged orifice plates to control flows discharging to the atmosphere; Utilizacion de placas de orificio para restringir el flujo de vapor de ductos que descargan a la atmosfera

    Energy Technology Data Exchange (ETDEWEB)

    Sanchez Upton, Pedro [Gerencia de Proyectos Geotermoelectricos de la Comision Federal de Electricidad, Morelia, (Mexico)

    1997-01-01

    The inner pipe thermodynamic behavior of steam when discharged freely to the atmosphere at the sound speed is studied in this paper. In addition, the effect of sharp edged orifice plates into pipes is shown, when they are utilized as a flow control device. In one case, it is assumed an orifice plate located at few feet distance from the pipe entrance. In other case, it is supposed that the orifice plate is fixed at the exit plane of the pipe. In all cases, it is considered that the pipe length is short enough and the flow speed too high to despise the heat transfer to the surrounding. The results were obtained through the simultaneous solution of the three fundamental equations of fluid mechanics, as well as the water equation of state and a correlation to quantify the steam choking mass flow rate. The main conclusion of the study reflects that the acoustic celerity is reached at the pipe exit plane for any of the different pipe arrangements. The speed of sound into steam was of the order of 560 m/s. It is recommended to fix the orifice plate at the exit of the pipe, in order to reduce inner erosion due to the steam flow. [Espanol] Se estudia el comportamiento termodinamico del vapor en el interior de una tuberia que descarga libremente a la atmosfera, bajo condiciones de flujo critico, y se muestra el efecto que genera una placa de orificio en esta tuberia al ser utilizada como un restringente de flujo. Se tratan dos casos: en uno la placa de orificio se instala al inicio de la tuberia y en el segundo la placa se localiza en la parte final de la misma. En todos los casos se considera que la longitud del ducto es lo suficientemente corta y que la velocidad del flujo es alta, de tal suerte que la transferencia de calor al ambiente es despreciable. Las soluciones se obtienen al resolver simultaneamente las tres ecuaciones de conservacion, en conjunto con las ecuaciones auxiliares de estado y una ecuacion desarrollada para cuantificar a los flujos criticos de vapor

  19. Training resources in renewable energy: study and evaluation; Recursos de capacitacion en energia renovable: estudio y evaluacion

    Energy Technology Data Exchange (ETDEWEB)

    De Buen Rodriguez, Odon [Energia, Tecnologia y Educacion, S.C., ENTE, S.C. (Mexico)

    2010-07-01

    The report herein describes the results of an evaluation process carried out to identify, document and analyze teaching and training capacities in the field of renewable energy for those who participate in the development, acquisition, installation, inspection and operation and maintenance of small- and large-scale wind, photovoltaic and solar water heating systems in North America. The document is divided into four sections. Chapter 1 presents the results of the evaluation process, expressed according to different parameters, as well as some of the significant findings. Chapter 2 responds to several questions related to difficulties, challenges, opportunities for improvement and recommendations, with a trilateral perspective. Chapter 3 evaluates the three technologies that are the focus of this study: photovoltaic, wind and solar heat. Chapter 4 describes the knowledge needed by those who professionally work in activities related to the three technologies mentioned, as well as their institutional context. The list of courses identified through this evaluation process are available on the CCA website, at www.cec.org/cursosenergia. [Spanish] El presente informe describe los resultados de un proceso de evaluacion llevado a cabo para identificar, documentar y analizar las capacidades en materia de ensenanza y capacitacion en energia renovable de quienes participan en la elaboracion, adquisicion, instalacion, inspeccion y operacion y mantenimiento de sistemas eolicos, fotovoltaicos y de calentamiento solar de agua -tanto pequenos como de gran escala-, en America del Norte. El documento se divide en cuatro partes. El capitulo 1 presenta los resultados del proceso de evaluacion, expresandolos en funcion de diferentes parametros, asi como ciertos hallazgos importantes. El capitulo 2 responde a diversas preguntas relativas a las dificultades, retos, oportunidades de mejoramiento y recomendaciones, con una perspectiva trilateral. El capitulo 3 evalua las tres tecnologias

  20. Evaluaciones económicas en salud: Conceptos básicos y clasificación

    OpenAIRE

    ZÁRATE,VÍCTOR

    2010-01-01

    El alza creciente de los costos en salud ha creado la urgente necesidad de evaluar económicamente las intervenciones de salud con el objetivo de priorizar aquellas que ofrecen un mejor valor o beneficio en relación a sus costos en un contexto local. El propósito de este artículo es entregar algunos principios básicos de evaluaciones económicas que mejorarán el conocimiento médico acerca de la metodología utilizada en este tipo de análisis y además ayudará a demostrar como la práctica clínica ...

  1. A rapid appraisal process on an irrigation system in Pakistan; Evaluacion rapida de una zona de riego tipica de Pakistan

    Energy Technology Data Exchange (ETDEWEB)

    Ruiz-Carmona, Victor Manuel; Ojeda-Bustamante, Waldo [Instituto Mexicano de Tecnologia del Agua, Jiutepec, Morelos (Mexico); Contijoch, Manuel [Banco Mundial (Mexico)

    2006-07-15

    This paper presents the results obtained on the implementation of a rapid appraisal process on an irrigation system in the province of Punjab in Pakistan. The purpose of the evaluation was to know the present irrigation service quality and to propose some alternative to improve it. The evaluation results were: the canal inflow is smaller than peak crop water requirement; net aquifer loss; crops are always under stress which is reflected on low crop yields, the secondary canal network has not control structures and was not designed for rotation, insufficient human-human communication between canal operators; the operators have no complementary training course to enhance their capacity; discrepancy between the service the canal is supposed to provide and the real service it offers. The suggested actions to improve the irrigation service were: the irrigation service must be client oriented; the irrigation users should participate to determine the irrigation service characteristics; the difference between actual and stage irrigation service must be eliminated; clear definition on water allocation; implement a modernization program to provide the irrigation service required. The evaluation methodology used can be applied in other countries like Mexico for the analysis of large irrigation systems making an optimal use of time and resources. [Spanish] En el presente trabajo se muestran los resultados obtenidos al aplicar una metodologia de evaluacion rapida de sistemas de riego a una zona de la provincia del Punjab, Pakistan. El objetivo de la evaluacion fue conocer el estado actual del servicio de riego que ofrece la agencia responsable del manejo del riego en un distrito del Punjab y proponer alternativas para mejorarlo. Los principales resultados de esta evaluacion fueron los siguientes: la falta de capacidad de los canales, el abatimiento neto del acuifero; el estres hidrico continuo de los cultivos, que propicia un bajo rendimiento; la red secundaria de canales no

  2. Evaluaciones económicas en salud: Conceptos básicos y clasificación

    OpenAIRE

    ZÁRATE,VÍCTOR

    2010-01-01

    El alza creciente de los costos en salud ha creado la urgente necesidad de evaluar económicamente las intervenciones de salud con el objetivo de priorizar aquellas que ofrecen un mejor valor o beneficio en relación a sus costos en un contexto local. El propósito de este artículo es entregar algunos principios básicos de evaluaciones económicas que mejorarán el conocimiento médico acerca de la metodología utilizada en este tipo de análisis y además ayudará a demostrar como la práctica clínica ...

  3. Evolução de 31 crianças submetidas à ressecção bilateral das glândulas submandibulares e ligadura dos ductos parotídeos para controlar a sialorréia Drooling: analysis and evaluation of 31 children who underwent bilateral submandibular gland excision and parotid duct ligation

    Directory of Open Access Journals (Sweden)

    Dayse Manrique

    2007-02-01

    Full Text Available OBJETIVOS: Avaliar a segurança da ressecção bilateral das glândulas submandibulares e ligadura dos ductos parotídeos em crianças para reduzir a saliva, a eficácia e as complicações em médio e longo prazo no tratamento da sialorréia. FORMA DE ESTUDO: Coorte longitudinal. MATERIAL E MÉTODO: Trinta e uma crianças, com idades entre 6 e 13 anos (média de 7,6 anos, com múltiplas deficiências de etiologia neurológica foram submetidas à ressecção bilateral das glândulas submandibulares e ligadura dos ductos parotídeos, para controle da sialorréia, entre dezembro de 1999 a dezembro de 2005, e seguimento médio de 36 meses. RESULTADOS: O critério de sucesso foi o estabelecido por Wilkie, e 87% das crianças tiveram resultados excelentes e bons, sendo a morbidade insignificante e a principal complicação foi o edema temporário na região parotídea. CONCLUSÃO: A ressecção bilateral das glândulas submandibulares e a ligadura dos ductos parotídeos constituem técnica segura e eficaz para ser realizada em crianças, com 87% de sucesso no controle da sialorréia.AIM: To evaluate the safety of bilateral submandibular gland excision and parotid duct ligation in order to control drooling in children; to assess its long-term efficacy and complications. STUDY DESIGN: longitudinal cohort. MATERIALS AND METHODS: Thirty-one children aged 6 to 13 years (7.6 years old in average, with multiple neurological disabilities were submitted to a bilateral submandibular gland excision with parotid duct ligation in order to control ptyalism between December 1999 and December 2005, mean follow up of 36 months. RESULTS: According to Wilkie’s success criteria, 87% of children had excellent or good results and insignificant morbidity was insignificant; with temporary parotid edema as the major complication. CONCLUSION: Bilateral submandibular gland excision with parotid duct ligation were safe to be performed in children, with 87% of success in

  4. Variação sazonal na morfologia dos ductos eferentes distais em codorna doméstica mantida em cativeiro experimental Morphologic seasonal variability on the distal efferent ducts of domestic quail under experimental captive breeding

    Directory of Open Access Journals (Sweden)

    Antonio Marcos Orsi

    2008-09-01

    Full Text Available Neste estudo diferenças expressivas foram observadas na estrutura dos ductos eferentes distais (DED de codorna doméstica Coturnix coturnix, da variedade italiana, mantida em cativeiro experimental durante dois anos, durante as quatro estações do ano. A variabilidade morfológica dos DED foi mais marcante na primavera e no outono, eqüivalendo às fases ativa e quiescente do ciclo reprodutivo anual (ciclo testicular nesta ave. Nessas fases do ciclo, diferenças significativas foram observadas na ultraestrutura das células principais (P e ciliadas (C do epitélio de revestimento tubular e nos calibres tubulares. Estes tiveram valores médios maiores na primavera, com valores similares no verão e no inverno, e valores médios menores observados no outono. Na primavera, no citoplasma apical de células P, notou-se maior complexidade organelar, inferindo-se a ocorrência de processos endocitóticos ativos. A quiescência outonal caracterizou-se por redução do calibre tubular dos DED, luz tubular vazia de espermatozóides, degenerações de organelas citoplasmáticas e "debridamentos" citoplasmáticos apicais em células P e C. No inverno e verão, correspondentes às fases recrudescente e regressiva, respectivamente, do ciclo testicular nesta espécie, os dados obtidos foram, de modo geral, similares aos observados na primavera.Some expressive differences were noted on the distal efferent ducts (DED morphology in domestic quail of the Italian variety along the year. The birds were maintained on experimental captive breeding along two consecutive years, before the morphologic studies. Morphologic differences on the DED had been more evident in spring and autumn respectively, the active and quiescent phases of the annual testis cycle. Variability more expressive was noted among the principal (P and ciliated (C epithelial cells and in tubular diameters of DED, during the two focused seasons. Spring features of DED were marked by relative

  5. Dopplerfluxometria de ducto venoso: identificação não invasiva da acidemia em fetos prematuros centralizados Ductus venosus velocimetry: noninvasive identification of fetal acidemia in preterm fetuses with brain sparing reflex

    Directory of Open Access Journals (Sweden)

    Renato Augusto Moreira de Sá

    2004-06-01

    Full Text Available OBJETIVO: estabelecer o ponto de corte a partir do qual seja possível identificar fetos prematuros com centralização do fluxo sangüíneo que apresentem gasometria anormal. MÉTODO: foi realizado estudo observacional transversal, cuja população consistia de 60 gestantes com fetos centralizados (relação umbílico-cerebral maior que 1, com idade gestacional entre 25 e 33 semanas. O ducto venoso foi identificado com auxílio da dopplerfluxometria colorida e obtida a relação S/A a partir do sonograma (relação entre a velocidade de pico da sístole ventricular e a velocidade de pico da sístole atrial. Imediatamente após a cesariana foi colhida amostra de sangue da veia umbilical para gasometria. Os conceptos foram classificados de acordo com a análise gasométrica e considerados anormais quando pH OBJECTIVE: to assess through Dopllerfluxometry the S/A ratio of the ductus venosus and determine the cut-off point to identify preterm fetuses with the 'brain sparing phenomenon". METHOD: a cross-sectional study was performed in 60 pregnant women that presented the "brain sparing phenomenon" (umbilical cerebral ratio >1 and gestational age between 25 and 33 weeks. The following parameters were studied: S/A ratio of the ductus venosus, pH and base excess (BE of a fetal blood sample collected from the umbilical vein immediately after birth. The fetuses were classified according to the gas analysis result. They were considered abnormal when pH <7.20 and BE < -6 mmol/l. A receiver operator characteristic (ROC curve analysis was performed to examine the relationship between S/A ratio and fetal acidemia. RESULTS: sixty pregnant women in the period of January 1998 to January 2003 were selected. In the moment of the study the gestational age varied from 25 to 33 weeks, with an average of 29.7 weeks (±1.8 weeks. All of the fetuses presented the "brain sparing phenomenon". Among them 14 presented abnormal gas analysis at birth and 46 presented normal

  6. Duración del sueño en estudiantes de medicina durante las evaluaciones semestrales finales: Un estudio piloto.

    OpenAIRE

    Loyola-Sosa,Steev; Osada, Jorge

    2013-01-01

    Objetivo: Describir la duración del sueño en estudiantes de medicina durante días académicos regulares y días previosa las evaluaciones semestrales finales. Material y métodos: Se realizó un estudio piloto descriptivo transversal.Participaron 40 estudiantes de la facultad de medicina de una universidad privada peruana. Se desarrolló, estandarizóy aplicó una encuesta estructurada enfocada en evaluar horas de sueño y estudio. Resultados: Se observó una altafrecuencia (58,97%, 23/39) de estudian...

  7. La autorregulación de los errores en las evaluaciones escritas de niños y niñas en la ciudad de Manizales

    OpenAIRE

    Cadavid Marín, Angela María; Parra Naranjo, Juan Pablo

    2010-01-01

    Esta investigación se realizó en la Institución Educativa Pablo VI de la ciudad de Manizales con niños y niñas de grado quinto. El principal objetivo fue comprender las implicaciones que tiene la perspectiva temporal en la autorregulación de los errores que evidencian en las evaluaciones escritas niños y niñas. La perspectiva temporal para la autorregulación es notoria en la medida en que se establece la planeación como estrategia para hablar de tiempo pasado, presente y futuro; esto inspira ...

  8. Histological study of the liver and biochemistry of the blood of Wistar rats following ligature of right hepatic duct Estudo histológico do fígado e bioquímico do sangue de ratos após ligadura do ducto hepático direito

    Directory of Open Access Journals (Sweden)

    Abel Botelho Quaresma

    2007-02-01

    Full Text Available PURPOSE: To observe the histological alterations in the liver and biochemistry in the blood that can happen in Wistar rat, after the ligature of right hepatic duct. METHODS: In this study were used rats (n=46 of Wistar pedigree. The animal groups (n=46 were distributed in 6 experimented sub-groups (n=6. It was held a ligature surgery of the right hepatic duct and euthanasia in 7, 14, 21, 28, 60 and 90 days and the biochemistry control group (n=10, that animals had 2ml of their blood taken by cardiac puncture for biochemistry study with value analyses of bilirubins, transaminasis, lactic desidrogenasis, alkaline phophatase and gamma-glutamil-transferase. Given the expected time of each group, the animals were submitted to anesthesia procedure and cavity re-opening, being held intra-cardiac puncture and with 2ml blood collected for biochemistry analyses. It was proceeded the liver resection, being the liver putted in formol solution to 10% for a period of 24 hours and taken to the histology. RESULTS: It was not possible to identify results that express significant differences as the existence of alterations histological and biochemistrily between the different groups. CONCLUSION: At the end of the study, it was not possible to identify histological and biochemistrily alterations that express significant differences between livers of the animals from the right linked hepatic duct and the animals of the control group.INTRODUÇÃO: a colestase é uma situação grave e geralmente letal. Habitualmente a obstrução do fluxo da secreção biliar ocorre por lesão iatrogênica. Cerca de 80% das lesões das vias OBJETIVO: Observar as alterações histológicas que possam ocorrer no fígado e bioquímicas no sangue de ratos Wistar, após ligadura do ducto hepático direito. MÉTODOS: Neste estudo foram utilizados ratos (n=46 da linhagem Wistar. O grupo de animais (n=46 foi dividido em 2 grupos: A experimento (n=36 e B controle bioquímico (n=10, sendo o

  9. Colecistectomia laparoscópica: experiência em 500 casos, enfatizando as vantagens da colecistocolangiografia e da ligadura do ducto e artéria cística utilizando fio de náilon Advantages of cholecystocholangiography and ligature of the cystic duct and artery with nylon suture: analysis of 500 laparoscopic cholecystectomies

    Directory of Open Access Journals (Sweden)

    Carlos Alberto Perim

    1999-02-01

    Full Text Available São apresentados os resultados clínicos de quinhentos pacientes submetidos a colecistectomia laparoscópica (CL, com o emprego da colecistocolangiografia intra-operatória e da ligadura do ducto cístico e da artéria cística utilizando- se fio de náilon em vez de clipes metálicos. A maioria (79,4% dos pacientes era do sexo feminino. A média de idade foi de 48,2 anos. Colecistite crônica ocorreu em 424 casos, colecistite aguda em 68, câncer da vesícula em quatro, colecistite alitiásica em três e um paciente apresentava pólipo de vesícula biliar. Coledocolitíase foi detectada em vinte (4% pacientes. O tempo médio de cirurgia foi de 84 minutos. A permanência hospitalar foi de um a dois dias para 93,4% dos pacientes. A mortalidade foi de 0,4%. Conversão se fez necessária em 39 (7,8% casos, principalmente por coledocolitíase (15 pacientes e colecistite aguda (14 pacientes. Complicações importantes ocorreram em 12 (2,4% casos, incluindo uma (0,2% lesão de colédoco. A co1ecistocolangiografia foi satisfatória em 80,5% e inconclusiva em 19,5% dos pacientes. A co1ecistoco1angiografia é uma excelente opção técnica na CL, principalmente nos pacientes com colecistite crônica. Todavia, nos casos com obstrução flagrante do ducto cístico, ou quando a vesícu1a contém barro biliar, é preferível utilizar a colangiografia transcística. Na CL, a ligadura do ducto e da artéria cística com clipes está associada a maiores riscos de coleperitônio e hemorragia, pela soltura dos clipes, além de originar expressivo custo monetário, quando se leva em consideração o grande número de CL realizadas anualmente. Ao contrário dos clipes, a ligadura do ducto e da artéria cística com fio de náilon apresenta absoluta segurança e significativa economia financeira.The authors present the results of 500 laparoscopic cholecystectomies (LC, employing intraoperative cholecystocholangiography and the ligature of the gallbladder pedicle

  10. Data acquisition system and calculation for the evaluation of polluting emissions in stacks; Sistema de adquisicion de datos y calculo para la evaluacion de emisiones contaminantes en chimeneas

    Energy Technology Data Exchange (ETDEWEB)

    Leon Enriquez, Javier

    1999-06-01

    The present thesis work, was developed in Visual C++5, to replace the present procedure of calculation in Excel and to avoid the manual processing of the data obtained during the evaluation of polluting from stacks, with movable laboratories that make dilutions in the originating gaseous sample of the stack. Six projects in Visual C++5 were designed. The first five include the formulas and procedures of calculation to obtain the total particulate emission suspended originating of stationary sources (stacks), indicated in the Code of Federal Regulations (CFR) part 60, emitted by the Environmental Protection Agency of the United Sates (EPA). The last one, includes the calculations necessary to read archives generated by a card of data acquisition and to consider the factor of dilution of the gaseous sample. A standard business card for the data acquisition is used during the monitoring process of the variables that requires the sixth mentioned project previously. The results of the monitoring of variables and result of the calculations are stored in archives that conform a data base of the made work, which allows future, to compare the results of the measurements and calculations in different evaluations from a same user. The made work can be used by evaluators companies of polluting emissions in stacks that count on dilution equipment during the evaluation. [Spanish] El presente trabajo de tesis, fue desarrollado en visual C++5, para sustituir el procedimiento actual de calculo en Excel y evitar el procesamiento manual de los datos obtenidos durante la evaluacion de emisiones contaminantes en chimeneas, con laboratorios moviles que realizan diluciones en la muestra gaseosa proveniente de la chimenea. Se disenaron 6 proyectos en visual C++5. Los primeros cinco incluyen las formulas y procedimientos de calculo para obtener la emision de particulas suspendidas totales provenientes de fuentes fijas (chimeneas), indicadores en el Codigo de Regulaciones Federales (CFR

  11. Evaluaciones Estandarizadas: Seis Reflexiones Críticas Standardized Assessments: Six Critical Reflections Avaliações Padronizadas: Seis Reflexões Críticas

    Directory of Open Access Journals (Sweden)

    Ignacio Barrenechea

    2010-04-01

    Full Text Available Este trabajo presenta una revisión de la literatura que analiza seis limitaciones claves que tienen las evaluaciones estandarizadas. Las seis críticas que se presentan son: la tensión que existe entre el concepto de inteligencias múltiples y las evaluaciones estandarizadas, la desatención de componentes del curriculum real - el cual no necesariamente se agota en el curriculum prescripto, los riesgos de enseñar para el test, los incentivos que se generan de hacer trampa con los resultados, la falta de consideración de las diferencias socio económicas de los alumnos que son evaluados, y, por último, las limitaciones de los resultados de las evaluaciones estandarizadas para predecir el éxito laboral de los estudiantes. Este trabajo concluye que este tipo de evaluaciones, si bien pueden tener ciertas ventajas, cuando son usadas como el único instrumento para tomar decisiones educativas, las limitaciones son mayores que sus beneficios.

    This paper presents a review of the literature analyzing six key limitations of standardized evaluations. The six criticisms are the following: the tension that exists between the concept of multiple intelligences and the standardized evaluations, the disregard of components of the real curriculum - which is not necessarily exhausted in the prescribed curriculum, the risks of teaching to the test, the incentives that are generated to cheat or inflate the results of the tests, the lack of consideration of the economic differences of the pupils who are evaluated, and, finally, the limitations of the results of standardized evaluations as predictors of the labour success of the students. This paper concludes that when this type of evaluation is used as the only basis of educational decisions, the costs outweigh the benefits.


    Este trabalho apresenta uma revisão da literatura para a análise de seis limitações chave que têm testes padronizados. As seis limitações apresentados são: tens

  12. Evaluation of the energy saving potential in illumination using presence sensors; Evaluacion del potencial de ahorro de energia en iluminacion utilizando sensores de presencia

    Energy Technology Data Exchange (ETDEWEB)

    Cortes Eslava, Alejandro [Universidad Nacional Autonoma de Mexico (UNAM), Mexico, D. F. (Mexico)

    1999-07-01

    The analysis and the evaluation of the energy saving that would provide a system of illumination controlled by sensors of presence in an enclosure with low transit, evaluating the economic profitability of the system is presented. The data, from which the analysis is sustained and the results are deducted, coming from the use and installation of a timer in the area. [Spanish] Se presenta el analisis y la evaluacion de los ahorros de energia que suministraria un sistema de iluminacion controlado por sensores de presencia en un recinto con bajo transito, evaluando la rentabilidad economica del sistema. Los datos, a partir de los cuales se sustenta el analisis y se deducen los resultados, provienen de la utilizacion e instalacion de un contador de tiempo de uso en el recinto.

  13. Methodology for evaluating the grounding system in electrical substations; Metodologia para la evaluacion del sistema de puesta a tierra en subestaciones electricas

    Energy Technology Data Exchange (ETDEWEB)

    Torrelles Rivas, L.F [Universidad Nacional Experimental Politecnica: Antonio Jose de Sucre (UNEXPO), Guayana, Bolivar (Venezuela)]. E-mail: torrellesluis@gmail.com; Alvarez, P. [Petroleos de Venezuela S.A (PDVSA), Maturin, Monagas (Venezuela)]. E-mail: alvarezph@pdvsa.com

    2013-03-15

    The present work proposes a methodology for evaluating grounding systems in electrical substations from medium and high voltage, in order to diagnose the state of the elements of the grounding system and the corresponding electrical variables. The assessment methodology developed includes a visual inspection phase to the elements of the substation. Then, by performing measurements and data analysis, the electrical continuity between the components of the substation and the mesh ground is verified, the soil resistivity and resistance of the mesh. Also included in the methodology the calculation of the step and touch voltage of the substation, based on the criteria of the International IEEE standards. We study the case of the 115 kV Pirital Substation belonging to PDVSA Oriente Transmission Network. [Spanish] En el presente trabajo se plantea una metodologia para la evaluacion de sistemas de puesta a tierra en subestaciones electricas de media y alta tension, con la finalidad de diagnosticar el estado de los elementos que conforman dicho sistema y las variables electricas correspondientes. La metodologia de evaluacion desarrollada incluye una fase de inspeccion visual de los elementos que conforman la subestacion. Luego, mediante la ejecucion de mediciones y analisis de datos, se verifica la continuidad electrica entre los componentes de la subestacion y la malla de puesta a tierra, la resistividad del suelo y resistencia de la malla. Se incluye tambien en la metodologia el calculo de las tensiones de paso y de toque de la subestacion, segun lo fundamentado en los criterios de los estandares Internacionales IEEE. Se estudia el caso de la Subestacion Pirital 115 kV perteneciente a la Red de Transmision de PDVSA Oriente.

  14. Evaluation of the mitochondrial respiration of cardiac myocytes in rats submitted to mechanical bile duct obstruction Avaliação da respiração mitocondrial de miócitos cardíacos em ratos ictéricos sumetidos à obstrução do ducto biliar

    Directory of Open Access Journals (Sweden)

    Rafael Kemp

    2008-01-01

    Full Text Available PURPOSE: The objective of the present study was to evaluate the capacity of the myocardium for energy production by the analysis of mitochondrial respiration in rats with jaundice submitted to bile duct ligature. METHODS: Sixteen male Wistar rats were divided into 2 Groups: Group SO submitted to nontherapeutic laparotomy (sham operation and Group IC (icteric group submitted to bile duct ligature. After 7 days, laparotomy was again performed in all animals for cardiac muscle extraction and analysis. Mitochondrial oxygen consumption was determined by stage 3 velocity and stage 4 velocity. The respiratory control ratio (RCR was obtained by the ratio of stage 3 to stage 4 velocity. Statistical analysis was performed by the Mann-Whitney test, with the level of significance set at 5% (pOBJETIVO: A proposta deste trabalho é avaliar a capacidade de produção energética do miocárdio mediante análise da respiração mitocondrial em ratos ictéricos submetidos à ligadura do ducto biliar. MÉTODOS: Foram utilizados 16 ratos Wistar machos divididos em 2 Grupos: Grupo SO , os quais foram submetidos à Laparotomia branca e Grupo IC, os quais sofreram ligadura do ducto biliar para o desenvolvimento de icterícia obstrutiva. Todos os animais após 7 dias de cirurgia foram submetidos à nova laparotomia para extração e análise do músculo cardíaco. O consumo de oxigênio pelas mitocôndrias foi determinado pela velocidade do estado 3 e velocidade do estado 4. A razão do controle respiratório (RCR foi obtida pela relação entre as velocidades dos estados 3 e 4. A análise estatística foi feita pelo teste de Mann-Whitney com nível de significância de 5 % (p<0.05. RESULTADOS: Observou-se queda estatisticamente significante nos valores do consumo de oxigênio do estado 3 da respiração mitocondrial no grupo IC em relação ao SO, no entanto os valores para estado 4 permaneceram basicamente inalterados entre os grupos. Os valores de RCR entre os

  15. Dopplerfluxometria do ducto venoso: relação com a gasometria em fetos prematuros com centralização de fluxo sangüíneo Ductus venosus velocimetry: relationship with fetal blood gases in preterm fetuses presenting brain sparing reflex

    Directory of Open Access Journals (Sweden)

    Renato Augusto Moreira de Sá

    2003-05-01

    Full Text Available OBJETIVO: avaliar o desempenho da dopplerfluxometria do ducto venoso (DV na detecção da acidemia em fetos prematuros apresentando centralização de fluxo sangüíneo. MÉTODOS: estudo observacional transversal. A população em estudo consistiu de 48 gestantes entre a 25ª e a 33ª semana de gestação, que apresentavam centralização de fluxo sangüíneo fetal (relação umbílico/cerebral >1. O tempo decorrido entre o diagnóstico de centralização fetal e o nascimento (cesariana sob anestesia peridural foi de até cinco horas. Os seguintes parâmetros foram estudados: relação sístole ventricular atrial (S/A do ducto venoso, pH e base excess (BE de amostra de sangue da veia umbilical colhida imediatamente após o nascimento. A relação S/A do DV foi considerada anormal quando maior que 3,6. Os conceptos foram classificados quanto ao resultado da gasometria, sendo considerada gasometria anormal quando pH PURPOSE: to evaluate Doppler velocimetry of the ductus venosus as a noninvasive test of abnormal pH and gas analysis in preterm fetuses with "brain sparing reflex". METHODS: a cross-sectional study was performed. The studied population consisted of 48 pregnant women between the 25th and the 33rd week of gestation, whose fetuses presented brain sparing reflex (umbilical/cerebral ratio >1. The time elapsed between Doppler velocimetry and the birth (cesarean section under peridural anesthesia was of up to 5 h. The following parameters were studied: S/A ratio of the ductus venosus, pH and base excess (BE of fetal blood sample (collected from the umbilical vein immediately after birth. The S/A ratio of the ductus venosus was considered abnormal when superior to 3.6. The fetuses were classified according to the gas analysis result. They were considered abnormal when pH <7.26 and BE £ 6 mMol/L. Fisher's test was used for statistical analysis and considered significant when p £ 0.05. RESULTS: there was a significant correlation between

  16. Una Alternativa para la Simulación Numérica del Comportamiento Térmico en Régimen Transitorio de Flujo de Gas en Redes de Ductos An Alternative to Numerical Simulation of Thermal Transient Behavior Gas Flow in Pipeline Networks

    Directory of Open Access Journals (Sweden)

    Arturo J Ortega

    2009-01-01

    Full Text Available En este trabajo se desarrolló un nuevo y práctico código computacional, para simular el comportamiento térmico en régimen transitorio de flujo de gas en redes de ductos, en presencia de varios tipos de componentes como válvulas, compresores, intercambiadores de calor, y bifurcaciones. El modelo matemático está basado en los principios de conservación de masa, cantidad de movimiento lineal y energía, además de ecuaciones constitutivas para los diversos componentes. La solución de las ecuaciones de conservación fue realizada usando el método de los volúmenes finitos. Diversos casos de estudio fueron analizados utilizando circuitos con diferentes tipos de bifurcación y varias combinaciones de puntos de admisión y descarga, localizados a lo largo de las líneas de los gasoductos. Los resultados de las pruebas fueron comparados con datos obtenidos usando un software comercial, presentando excelente concordancia.In this work a new and practical computational code to simulate thermal transient gas flow in pipeline networks with presence of several types of components as valves, compressors, heat exchangers, and pipe bifurcations, was developed The mathematical model is based on the conservation principles of mass, linear momentum and energy, plus the constitutive equations for each component. The conservation equations solution was done using the finite volume method. Several study cases were analyzed using pipe networks with different types of bifurcation and different combination of supply and delivery points located along the network. The tests results were compared with data obtained using commercial software showing excellent agreement.

  17. Aspectos ultra-sonográficos dos hamartomas dos ductos biliares (complexo de von Meyenburg: resultado de uma busca ativa de oito anos Ultrasonography findings in patients with bile duct hamartomas (von Meyenburg complex: result of an active search of eight years

    Directory of Open Access Journals (Sweden)

    Márcio Martins Machado

    2003-06-01

    Full Text Available A correta identificação de tumores hepáticos benignos é importante, pois a maioria não necessita de conduta intervencionista. Os autores relatam os aspectos ultra-sonográficos dos hamartomas de ductos biliares (complexo de von Meyenburg em 16 pacientes estudados prospectivamente, resultados de uma busca ativa de oito anos. Em 14 pacientes foram identificadas múltiplas lesões menores ou iguais a 0,8 cm, e em dois, apenas duas lesões em cada (medindo de 0,4 cm a 1,3 cm. O aspecto ultra-sonográfico que predominou foi o de múltiplas pequenas imagens hiperecogênicas com ou sem reverberação sonora posterior e margens irregulares (14 pacientes. Menos comumente, foi encontrado o aspecto "em alvo", com centro com maior ecogenicidade que a periferia (dois pacientes com duas lesões cada e margens bem definidas.The recognition and identification of benign liver tumors is important since most of these tumors do not require any intervention. The authors report the ultrasonography findings in 16 patients with bile duct hamartomas (von Meyenburg complex that were evaluated prospectively by an active search of eight years. Multiple lesions with size equal or less than 0.8 cm were identified in 14 patients. Two other patients had only two lesions measuring 0.4 cm to 1.3 cm. The most common ultrasonographic pattern was that of multiple small hyperechogenic lesions (with or without posterior acoustic reverberation with irregular margins (14 patients. A less common finding (two patients with two lesions each was the "target" pattern with echogenic center and well defined limits.

  18. Valores dos parâmetros da dopplerfluxometria do ducto venoso entre a 10ª e a 14ª semana de gestações normais Values for ductus venosus doppler flow measurements between the 10th and the 14th week of normal pregnancy

    Directory of Open Access Journals (Sweden)

    Francisco Herlânio Costa Carvalho

    2004-02-01

    Full Text Available OBJETIVO: analisar os valores dos parâmetros dopplerfluxométricos do ducto venoso, entre a 10ª e a 14ª semana de gestação, durante as diferentes fases do ciclo cardíaco: sístole ventricular (onda S, diástole ventricular (onda D, contração atrial (onda a e dos índices ângulo-independentes. MÉTODOS: foi desenvolvido estudo prospectivo e transversal que examinou 276 gestações únicas. Foram excluídas as gestações múltiplas, malformações fetais, fetos com translucência nucal aumentada e gestantes com doenças associadas. O equipamento utilizado foi Toshiba, modelo SSH-140 A. A análise espectral foi obtida de acordo com os procedimentos padronizados: ângulo de insonação menor que 30° e uso de filtro de 50-70 Hz. O ducto venoso foi identificado em corte sagital e ventral do abdome superior fetal com o Doppler colorido. A amostra de volume (1-2 mm³ foi adquirida imediatamente na origem do ducto venoso. Pelo menos três ondas nítidas e consecutivas foram necessárias para aferição dos parâmetros. Para o estudo estatístico foi realizado o teste de Levene e o método de Bonferroni. RESULTADOS: foi observado aumento na velocidade S de 29 cm/s para 37 cm/s (p=0,013 entre a 10ª e a 14ª semana de gestação. Similarmente, houve aumento na velocidade D (de 25 cm/s para 32 cm/s, p=0,026. A onda a, o índice de pulsatilidade e a relação S/a apresentaram valores constantes no período estudado. CONCLUSÃO: os valores estabelecidos por este estudo podem servir para acompanhamento dopplerfluxométrico de gestações normais. Futuros estudos são necessários para determinar a validade destes parâmetros na população normal e, em particular, para fetos de risco.PURPOSE: to analyze the values of Doppler ultrasound for blood flow velocity in the ductus venosus between the 10th and the 14th week of gestation, during the different phases of the cardiac cycle: ventricular systole (wave S, ventricular diastole (wave D, atrial

  19. Evaluation of a integral systems greenhouse - solar dryer for small growers; Evaluacion de un sistema integral invernadero - secadero solar para pequenos productores

    Energy Technology Data Exchange (ETDEWEB)

    Garcia, Victor O; Iriarte, Adolfo A [INENCO, Universidad Nacional de Catamarca, Catamarca (Argentina); Carabajal, Dante; Sabadzija, Gabriela; Tomalino, Luis [E.E.A. INTA, Catamarca, Catamarca (Argentina)

    2000-07-01

    sistema productivo, y en el verano se le acondiciona para cumplir las funciones de secadero solar. En la epoca invernal los cultivos evaluados fueron zapallito (Cucurbita maxima L), melon (Cucumis melo) y pepinillo (Cucumis sativus), determinandose ciclos de cultivo, periodo de cosecha y rendimiento en kg m{sup 2} para cada especie. La evaluacion del comportamiento como secador se realizo utilizando pimiento para pimenton (Capsicum annum). En este caso se analiza comportamiento termico del diseno, sistema de calefaccion auxiliar, comportamiento del producto durante el secado y calidad final del mismo. Se obtuvo un producto final de muy buena calidad tanto en color, sabor, aroma, con una clasificacion de calidad extra segun el Codigo Alimentario Argentino y la Norma ISO 7541. El tiempo de secado disminuyo notablemente respecto al secado a cielo abierto. La evaluacion economica se realizo para las campanas 1995, 1996, 1997, efectuandose posteriormente una evaluacion financiera de la inversion para un periodo de cinco anos obteniendose un VAN positivo y un TIR superior al costo de la mejor alternativa de uso del dinero. El sistema integrado es una alternativa valida en el marco de una produccion sustentable productiva para pequenos productores.

  20. Evaluation of environmental sustainability in the construction and management of buildings in Mexico; Evaluacion de la sustentabilidad ambiental en la construccion y administracion de edificios en Mexico

    Energy Technology Data Exchange (ETDEWEB)

    De Buen Rodriguez, Odon [Energia, Tecnologia y Educacion, S.C., ENTE, S.C. (Mexico)

    2010-12-15

    fully international system of certification of environmental sustainability. In particular, it is recommended: 1) To suggest to CONUEE the integration of additional variables to its database, 2) To conduct a national survey of commercial buildings, 3) To review information on commercial buildings located in Mexico by international organizations. Likewise, besides the support of the CONUEE, it would be useful to carry out an study jointly with the Comision Federal de Electricidad (CFE), the Secretaria de Energia (SENER) and the Fideicomiso para el Ahorro de Energia Electrica (FIDE), in order to share and generate information for common analytical needs. Also, it is suggested to establish contact with chambers, associations and companies operating primarily in buildings such as schools, hospitals, hotels, department stores, supermarkets and restaurants. [Spanish] Esta investigacion tuvo como objetivo desarrollar una metodologia para la evaluacion de la sustentabilidad de los edificios en Mexico que pueda ser estandarizada y equiparable con el resto de Norteamerica. Con este proposito se revisaron y analizaron tres sistemas de evaluacion de edificaciones sustentables en Norteamerica: Leadership in Energy and Environmental Design (LEED), Living Building Challenge (LBC) y Energy Star for Buildings. Ademas, se incluyo en el analisis el sistema espanol Green Building Council Espana (GBCe) con el fin de tener un punto referencia distinto al norteamericano. Como resultado del analisis de los sistemas de evaluacion consultados se decidio utilizar Energy Star como sistema de referencia para el desarrollo de una metodologia propia por las siguientes razones: a) La metodologia de Energy Star permite la comparacion de consumos de energia, lo cual permitiria estimar emisiones de gas de efecto invernadero, b) Es el sistema que requiere de la descripcion mas sencilla del edificio (datos de area, de ocupacion y de demanda y consumo energeticos) y no requiere - a diferencia de los otros

  1. Evaluation of the reliability of electric power transmission systems; Evaluacion de confiabilidad de sistemas de transmision de energia electrica

    Energy Technology Data Exchange (ETDEWEB)

    Vega Ortiz, Miguel

    1989-07-01

    algorithm in a digital program, this was proved in a personal computer applying it to IEEE transmission systems evaluated with other methods, among them one of 140 buses and 199 transmission lines. The results as far as reliability indexes compared with the other methods were very satisfactory and promising as far as required CPU time and memory for larger systems. [Spanish] En esta tesis se ataca el problema de la Evaluacion de la Confiabilidad de los Sistemas de Transmision de Energia Electrica para fines de su planeacion integral. Una vez descrito el problema se presentan los indices que miden la confiabilidad de los sistemas electricos de potencia. Despues se describen los metodos para evaluar las redes de transmision, como el de Enumeracion de Contingencias, el Monte Carlo, el de Markov y los metodos para sistemas complejos como el de Cortes Minimos. Este ultimo se desarrolla ampliamente por las ventajas que presenta su aplicacion en la planeacion de redes grandes y complejas. El metodo de cortes minimos consta de dos grandes pasos: Determinar los cortes minimos para los puntos de carga y calcular los indices de confiabilidad en base a los cortes minimos. Los algoritmos convencionales para la determinacion de cortes minimos consideran un problema por cada punto de carga en forma independiente pasando por una determinacion de caminos minimos. En este tipo de algoritmos el tiempo de CPU y el espacio en memoria requeridos crecen exponencialmente para el caso de sistemas de transmision grandes, lo que representa una fuerte restriccion para su aplicacion. Para resolver este problema se establecio una metodologia en la que se modela el sistema por medio de un grafo y se determinan los cortes minimos con un algoritmo basado en la construccion de ciclos en el grafo dual. Con estos cortes se evalua la conexidad y capacidad de la red, obteniendose los indices de confiabilidad para cada bus y para el sistema. Estos indices se calculan con la representacion equivalente para

  2. Review of experimental models for inducing hepatic cirrhosis by bile duct ligation and carbon tetrachloride injection Revisão de modelos experimentais de cirrose hepática induzida por ligadura do ducto biliar e por injeção de tetracloreto de carbono

    Directory of Open Access Journals (Sweden)

    Thamirys Guimarães Marques

    2012-08-01

    Full Text Available PURPOSE: To present a review about a comparative study of bile duct ligation versus carbon tetrachloride Injection for inducing experimental liver cirrhosis. METHODS: This research was made through Medline/PubMed and SciELO web sites looking for papers on the content "induction of liver cirrhosis in rats". We have found 107 articles but only 30 were selected from 2004 to 2011. RESULTS: The most common methods used for inducing liver cirrhosis in the rat were administration of carbon tetrachloride (CCl4 and bile duct ligation (BDL. CCl4 has induced cirrhosis from 36 hours to 18 weeks after injection and BDL from seven days to four weeks after surgery. CONCLUSION: For a safer inducing cirrhosis method BDL is better than CCl4 because of the absence of toxicity for researches and shorter time for achieving it.OBJETIVO: Apresentar revisão sobre estudo comparativo da indução de cirrose hepática (CH experimental com a injeção de tetra-cloreto de carbono (CCl4 comparado à ligadura do ducto biliar (BDL. MÉTODOS: A pesquisa foi realizada nas bases de dados do Medline/PubMed e SciELO procurando trabalhos com as palavras indução de CH e ratos. Foram encontrados 107 artigos, mas somente 30 foram selecionados no período de 2004 à 2011. RESULTADOS: Os procedimentos mais comum para indução de CH em ratos foram a injeção de CCl4 e a BDL. O CCl4 induzia CH no período de 36 horas após a injeção e a DBL de sete dias à quatro semanas após a cirurgia. CONCLUSÃO: A BDL é o método mais seguro para indução de CH quando comparado a injeção de CCl4 pela ausência de toxicidade para os pesquisadores e o menor tempo para se obter a lesão hepática.

  3. Evaluation of environmental sustainability in the construction and management of buildings in Mexico; Evaluacion de la sustentabilidad ambiental en la construccion y administracion de edificios en Mexico

    Energy Technology Data Exchange (ETDEWEB)

    De Buen Rodriguez, Odon [Energia, Tecnologia y Educacion, S.C., ENTE, S.C. (Mexico)

    2010-12-15

    fully international system of certification of environmental sustainability. In particular, it is recommended: 1) To suggest to CONUEE the integration of additional variables to its database, 2) To conduct a national survey of commercial buildings, 3) To review information on commercial buildings located in Mexico by international organizations. Likewise, besides the support of the CONUEE, it would be useful to carry out an study jointly with the Comision Federal de Electricidad (CFE), the Secretaria de Energia (SENER) and the Fideicomiso para el Ahorro de Energia Electrica (FIDE), in order to share and generate information for common analytical needs. Also, it is suggested to establish contact with chambers, associations and companies operating primarily in buildings such as schools, hospitals, hotels, department stores, supermarkets and restaurants. [Spanish] Esta investigacion tuvo como objetivo desarrollar una metodologia para la evaluacion de la sustentabilidad de los edificios en Mexico que pueda ser estandarizada y equiparable con el resto de Norteamerica. Con este proposito se revisaron y analizaron tres sistemas de evaluacion de edificaciones sustentables en Norteamerica: Leadership in Energy and Environmental Design (LEED), Living Building Challenge (LBC) y Energy Star for Buildings. Ademas, se incluyo en el analisis el sistema espanol Green Building Council Espana (GBCe) con el fin de tener un punto referencia distinto al norteamericano. Como resultado del analisis de los sistemas de evaluacion consultados se decidio utilizar Energy Star como sistema de referencia para el desarrollo de una metodologia propia por las siguientes razones: a) La metodologia de Energy Star permite la comparacion de consumos de energia, lo cual permitiria estimar emisiones de gas de efecto invernadero, b) Es el sistema que requiere de la descripcion mas sencilla del edificio (datos de area, de ocupacion y de demanda y consumo energeticos) y no requiere - a diferencia de los otros

  4. Detection and evaluation of corrosion zones at high temperature in steam generators; Deteccion y evaluacion de zonas de corrosion en alta temperatura de generadoras de vapor

    Energy Technology Data Exchange (ETDEWEB)

    Martinez Villafane, Alberto; Chacon Nava, Jose G.; Huerta Espino, Mario; Mojica Calderon, Cecilio; Castillo Viveros, Antonio [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1990-12-31

    This paper presents the methodology for the detection and evaluation of high corrosion zones at high temperature. The results found up to now, show a critical zone in the Babcock Hitachi design, specifically in the high temperature reheater in the zone nearby the outlet header. In the normalized design CE (Mitsubishi) of 300 MW and CE (Canada) of 300 MW, the results found in recent years show small thickness reduction, therefore a good operation of these steam generators is recognized. [Espanol] En este trabajo se presenta la metodologia para la deteccion y evaluacion de zonas de corrosion en alta temperatura. Los resultados encontrados hasta el momento muestran una zona critica en el diseno Babcock Hitachi, especificamente en el recalentador de alta temperatura en la zona cercana al cabezal de salida. En el diseno normalizado CE (Mitsubishi) de 300 MW y CE (Canada) de 300 MW, los resultados encontrados en anos recientes muestran poca disminucion de espesor, por lo que se considera una buena operacion de estos generadores de vapor.

  5. Assessment of wind potential at three sites in the state of Durango; Evaluacion del potencial eolico en tres sitios del estado de Durango

    Energy Technology Data Exchange (ETDEWEB)

    Saldana Flores, Ricardo; Miranda Miranda, Ubaldo

    2010-11-15

    As part of the activities of the project Laboratorio Nacional para la Evaluacion de los Recursos Renovables en Mexico (LERM), a preliminary estimate of the wind potential in three sites of Durango state was carried out, Lerdo (103 degrees 31 minutes 28 seconds W, 25 degrees 32 minutes 10 seconds N and 1140 m altitude), Guadalupe Victoria (104 degrees 07 minutes W, 24 degrees 27 minutes N and 2000 m altitude) and Santiago Papasquiaro (105 degrees 25 minuets 09 seconds W, 25 degrees 02 minutes 38 seconds N and 1720 m altitude). The following results were obtained from data analysis: Lerdo, measurement period February 2009 to January 2010 (20 m height), monthly wind speed average 1.790 to 2.960 m/s, mean power density 11.730 to 45.044 W/m{sup 2}, Guadalupe Victoria, measurement period March 2009 to February 2010 (50 m height), monthly wind speed average 3.200 to 6.440 m/s, mean power density 37.024 to 241.968 W/m{sup 2}; and Santiago Papasquiaro, measurement period April to August 2009 (30 m height), monthly wind speed average 2.290 to 4.320 m/s, mean power density 23.313 to 127.353 W/m{sup 2}. [Spanish] Como parte de las actividades desarrolladas dentro del proyecto Laboratorio Nacional para la Evaluacion de los Recursos Energeticos Renovables en Mexico (LERM), se llevo a cabo la estimacion preliminar del potencial eolico en tres sitios de interes del estado de Durango, Lerdo (103 grados 31 minutis 28 segundos O, 25 grados 32 minutos 10 segundos N y 1140 m de altitud), Guadalupe Victoria (104 grados 07 minutos O, 24 grados 27 minutos N y 2000 m de altitud) y Santiago Papasquiaro (105 grados 25 minutos 09 segundos O, 25 grados 02 minutos 38 segundos N y 1720 m de altitud). Analizando la informacion obtenida en diferentes periodos de medicion se obtuvieron los siguientes resultados: Lerdo, periodo de medicion de febrero de 2009 a enero de 2010 a 20 m de altura, velocidad promedio mensual del viento entre 1.790 y 2.960 m/s, densidad de potencia media entre 11.730 y 45

  6. Experimental evaluation of the consumption of electrical energy of domestic refrigerators in Mexico; Evaluacion experimental del consumo de energia electrica de refrigeradores domesticos en Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Arroyo Cabanas, Fernando Gabriel [Programa de Energia, Universidad Nacional Autonoma de Mexico, Mexico, D.F. (Mexico); Ambriz Garcia, Juan Jose; Paredes Rubio, Hernando Romero [Area de Ingenieria en Recursos Energeticos, Universidad Autonoma Metropolitana, Mexico, D.F. (Mexico)

    2004-06-15

    In this work the experimental methodology developed to carry out tests of the electrical energy of refrigerators consumption as norm NOM-015-ENER-2002 is described. The tests were made in the Laboratory of Controlled Environment of the Iztapalapa Unit of the Universidad Autonoma Metropolitana to a sample of old domestic refrigerators in operation. The results found show that the consumption of electrical energy of refrigerators of more than 10 years of age can be higher than 60% of what a modern refrigerator of high efficiency would consume, or 30% higher if the refrigerator was made between 1997 and 2002. With these results it is sustained, in a more complete way, the evaluation of the saving potential of the national electrical energy by the substitution of old domestic refrigerators by modern, as reported in a previous work. [Spanish] En este trabajo se describe la metodologia experimental desarrollada para efectuar pruebas del consumo de energia electrica a refrigeradores conforme la norma NOM-015-ENER-2002. Las pruebas se realizaron en el Laboratorio de Ambiente Controlado de la Unidad Iztapalapa de la Universidad Autonoma Metropolitana a una muestra de refrigeradores domesticos antiguos en operacion. Los resultados encontrados muestran que el consumo de energia electrica de refrigeradores de mas de 10 anos de antig�edad puede superior al 60% de lo que consumiria un refrigerador moderno de alta eficiencia, o superior en un 30% si el refrigerador fue fabricado entre 1997 y 2002. Con estos resultados se sustenta de manera mas completa la evaluacion del potencial de ahorro de energia electrica nacional por substitucion de refrigeradores domesticos antiguos por modernos reportado en un trabajo anterior.

  7. Estudo do sonograma do ducto venoso em fetos com centralização hemodinâmica: avaliação de repercussões perinatais Study of ductus venosus in fetuses with brain sparing reflex: evaluation of perinatal outcomes

    Directory of Open Access Journals (Sweden)

    Paulo Roberto Nassar de Carvalho

    2006-04-01

    Full Text Available OBJETIVO: avaliar a associação da relação sístole ventricular/atrial (S/A do ducto venoso (DV com resultados perinatais em fetos prematuros com centralização de fluxo à dopplervelocimetria. MÉTODOS: o estudo foi delineado como um estudo observacional, transversal, com os dados colhidos de forma prospectiva. A relação S/A do DV foi estudada em 41 fetos centralizados com idade gestacional (IG entre 25 e 33ª semana completa, no período de novembro de 2002 a julho de 2005. Os recém-nascidos foram acompanhados até o 28º dia pós-parto na UTI da Clínica Perinatal Laranjeiras, buscando-se complicações neonatais. A população de estudo foi dividida em dois grupos a partir do resultado do DV. Foram incluídos no grupo normal os fetos com relação S/A menor ou igual a 3,6 e no grupo alterado aqueles com valores de S/A maiores que 3,6. A comparação entre os grupos foi realizada com os testes estatísticos de Mann-Whitney, chi2 e exato de Fisher. Todos os resultados foram considerados estatisticamente significativos se p3,6. Não houve diferença significativa entre os grupos quanto à IG ao nascimento e Apgar PURPOSE: to evaluate the relationship between S/A ratio in ductus venosus (DV and perinatal outcomes in fetuses with brain sparing reflex. METHODS: the study was designed as an observational, sectional study with prospectively collected data. Forty-one fetuses with brain sparing reflex and gestational age between 25 and 33 weeks were studied between November 2002 and July 2005. The newborns were observed during the neonatal period in the intensive care unit of "Clínica Perinatal Laranjeiras" in order to find adverse outcomes. The study population was divided into two groups according to DV assessment. In the normal group all the fetuses with S/A ratio values of 3.6 or less were included, and in the abnormal group the fetuses with values of S/A ratio greater than 3.6. The statistical analysis was performed by the Mann-Whitney U

  8. Benign obstruction of the common hepatic duct (Mirizzi syndrome: diagnosis and operative management Obstrução benigna do ducto hepático comum (síndrome de Mirizzi: diagnóstico e tratamento operatório

    Directory of Open Access Journals (Sweden)

    Jaques Waisberg

    2005-03-01

    postoperative sepsis due to a sub-hepatic abscess, and was reoperated. There was no operative mortality. CONCLUSION: The preoperative diagnosis of Mirizzi syndrome is difficult and an awarded suspicion is necessary to avoid lesions of the biliary tree. The problem may only become evident during the operation due to firm adherences around Calot's triangle. The success of the treatment is related to a precocious recognition of the condition, even at the time of surgery, and adapting the management considering to the individual characteristics of each case.RACIONAL: A síndrome de Mirizzi, é complicação rara da colelitíase de longa duração, caracterizada pelo estreitamento do ducto hepático comum devido a mecanismo de compressão e/ou inflamação por cálculos biliares impactados no infundíbulo da vesícula biliar ou no ducto cístico. OBJETIVO: Descrever série de oito enfermos consecutivos com síndrome de Mirizzi de uma única instituição, submetidos ao tratamento cirúrgico e comentar seus aspectos com ênfase no diagnóstico e tratamento. MÉTODO: Quatro mulheres e quatro homens, com média de idade de 61,6 anos (42 a 82 anos, foram operados com síndrome de Mirizzi entre 1997 e 2003. Avaliaram-se a apresentação clínica, os resultados dos exames laboratoriais e de imagem, os achados operatórios, a presença de coledocolitíase, o tipo de síndrome de Mirizzi de acordo com a classificação de Csendes, a escolha do procedimento operatório e as complicações pós-operatórias. RESULTADOS: Os sintomas mais freqüentes foram dor abdominal (87,5% e icterícia (87,5%. Todos os doentes apresentaram exames de função hepática alterados. O diagnóstico da síndrome de Mirizzi foi intra-operatório em sete (87,5% doentes, e pré-operatório em um (12,5%. Observou-se fístula colecistocoledociana associada à coledocolitíase em três (37,5% casos. A síndrome de Mirizzi foi classificada como tipo I em cinco (71,4% doentes, tipo II em um (14,3%, tipo III em um (12

  9. Exploitation of biogas in municipal in slaughterhouses: Technical-economical evaluation; Aprovechamiento de biogas en rastros y mataderos municipales: Evaluacion tecnica-economica

    Energy Technology Data Exchange (ETDEWEB)

    Martinez Hernandez, Donaji A.; Castaneda Sanchez, Arlem M.; Garcia Galeana, Erika [Universidad Nacional Autonoma de Mexico (UNAM), Facultad de Ingenieria (Mexico)

    2009-07-01

    Nowadays the treatment of the solid and liquid remainders in the municipal slaughter houses is small because of the idea that the treatment is expensive; nevertheless, it is important to take advantage of them, since this can reduce to the environmental impacts they cause, as well as the discharge of greenhouse effect gas. The use of bio digesters for the treatment of these remainders has become an efficient process to avoid the exit of methane gas to the atmosphere, taking advantage of the biogas and other residues to produce electricity. The elaboration of a technical-economical evaluation of a pilot plant shows the costs of investment, maintenance, as well as the income that can be obtained by the total usage of these residues and the savings in the electrical power consumption. The analysis of this study demonstrates that the use of biogas through bio-digesters for the generation of electrical energy is a profitable option for the treatment of the residues, because the income by the sale of compost, blood flour, as well as the diminution of the electrical tariff, justifies the initial investment. These projects will be more attractive, if they use financing and are registered as MDL projects. [Spanish] Actualmente el tratamiento de los desechos solidos y liquidos en los rastros y mataderos municipales es poco pues se tiene la idea de que el tratamiento es costoso; sin embargo, es importante que se aprovechen ya que esto puede reducir los impactos ambientales que provocan, asi como la emision de gases de efecto invernadero. El uso de biodigestores para el tratamiento de estos desechos, se ha convertido en un proceso eficiente para evitar la salida de gas metano a la atmosfera, aprovechando el biogas y otros residuos para producir electricidad. La elaboracion de una evaluacion tecnica-economica de una planta piloto, muestra los costos de inversion, mantenimiento, asi como los ingresos que se pueden obtener por el aprovechamiento total de estos residuos y el

  10. Evaluation and characterization of 30 solar home systems (SHS) Ovonic-Unisolar; Caracterizacion y evaluacion de 30 sistemas FV domiciliarios ovonic-unisolar

    Energy Technology Data Exchange (ETDEWEB)

    Flores, J. Roberto; Agredano, Jaime; Munguia, Gonzalo; Lagunas, Javier; Huacuz, Jorge [Instituto de Investigaciones Electricas, Temixco, Morelos (Mexico); Brennan, Steve [Troy, MI (United States)

    2000-07-01

    In this work the first results of the evaluation and characterization of 30 solar home systems (SHS) Ovonic-Unisolar (16 of 30 W and 14 of 60 W of capacity) are presented. The components of the SHS are: One or two PV modules, a charge controller, a nickel metal-hybride (NiMH) battery with a nominal capacity of 85 Ah rated at 3 hours, two or four 8 W lamps, and a CD/CD converter for connecting a radio or a TV W/B a maximum power of 20W. Of all systems evaluated, 29 were installed in three communities of the Oaxaca State, and the other 2 are installed at the Instituto de Investigaciones Electricas (IIE) the laboratory as prototype systems. Before the systems installation at the rural communities, all of them were tested in laboratory. Eight systems installed in the field are being monitoring with data acquisition systems. The main motivation of this projects is to know the behavior of the NiMH battery in the SHS. [Spanish] En este trabajo se presentan los primeros resultados de la caracterizacion y evaluacion de 30 sistemas fotovoltaicos (FV) domiciliarios Ovonic-Unisolar (16 con capacidad de 30 W y 14 con capacidad de 60 W). Los sistemas estan integrados por uno o dos modulos FV de 30 W (dependiendo de la capacidad del sistema), un controlador de carga con termo-interuptor, una bateria del tipo niquel hidruros metalicos (NiHM) con capacidad de 85 Ah a una razon de descarga de 3 horas, 2 o 4 lamparas compactas de alta eficiencia de 8 W y un convertidor CD/CD que permite a los usuarios utilizar una radiograbadora y/o una television B/N con potencia no mayor a 20 W. De estos 30 sistemas FV, 28 se instalaron en 3 comunidades rurales del Estado de Oaxaca y los dos sistemas restantes se tienen instalados en el laboratorio FV del Instituto de Investigaciones Electricas (IIE) como sistemas testigos. Previo a la instalacion en campo, todos los sistemas fueron evaluados en el laboratorio para garantizar su operacion en las comunidades rurales. De los 28 sistemas instalados en

  11. Fluids acidity in Los Humeros geothermal reservoir, Puebla, Mexico: Mineralogical evaluation; Acidez de los fluidos del yacimiento geotermico de Los Humeros, Puebla, Mexico: Evaluacion mineralogica

    Energy Technology Data Exchange (ETDEWEB)

    Izquierdo M, Georgina; Arellano G, Victor Manuel; Portugal M, Enrique; Aragon A, Alfonso [Instituto de Investigaciones Electricas, Temixco, Morelos (Mexico); Martinez, Ignasio [Comision Federal de Electricidad (Mexico)

    2000-12-01

    The occurrence of the acidity in fluids from Los Humeros geothermal reservoir has been noticeable due to the accelerated corrosion of pipes lines of wells located mainly in the area known as Collapse Central and wells along the East direction of the field. On the base of the evaluation of all available chemical and mineralogical information for Los Humeros geothermal field the main objective of this work was to recognize evidences on the origin of geothermal fluids acidity. Considering the occurrence of HCl in other geothermal systems, no relation to the available information from Los Humeros was found. It is possible that the geothermal fluids acidity would be recent. It could be generated when the deep reservoir was reached by drilling wells. However, the occurrence of H{sub 2}SO{sub 4} is evident due to the advance argillic alteration of surface rocks in some areas of the field. It is probable that the model proposed by D' Amore, may be valid for the geothermal field of Los Humeros. Considering that the origin of the vapor phase from the deep reservoir would be a fluid (of very high salinity) that favored the formation of the HCl gas; which moved to the vapor zone when exploitation began being transported in the vapor phase toward the upper reservoir forming aqueous HCl. [Spanish] La presencia de acidez en los fluidos producidos por el yacimiento geotermico de Los Humeros se ha evidenciado por la acelerada corrosion de las tuberias de algunos pozos localizados principalmente en la zona conocida como Colapso central y en direccion Este del campo. Con el objeto de identificar evidencias que permitan establecer el origen de la acidez en los fluidos geotermicos, se llevo a cabo la evaluacion de la informacion quimica y mineralogica existente para el campo geotermico de Los Humeros. Empleando los criterios conocidos sobre la presencia de HCl en otros sistemas geotermicos no se encontro relacion con la informacion evaluada. Por lo que se sugiere que la acidez en

  12. Efeitos da ligadura do ducto pancreático e da secção ductal com livre drenagem de secreções para o peritônio sobre as funções endócrina e exócrina do pâncreas: estudo clínico e laboratorial em coelhos Endocrine and exocrine consequences of the open and ligated pancreatic duct: clinical and laboratorial findings in rabbits

    Directory of Open Access Journals (Sweden)

    Lauro Bogodar Kuczynski

    2004-06-01

    Full Text Available As ressecções pancreáticas seguidas de anastomoses acompanham-se de altas taxas de morbidade, que incluem: surtos de pancreatite e, principalmente, fístulas digestivas. Nos transplantes pancreáticos a drenagem da parte exócrina do enxerto para o intestino ou para a bexiga, além das peculiaridades técnicas, também não é isenta de diversas complicações. Visando evitar ou atenuar tais conseqüências e simplificar a técnica cirúrgica, têm sido usadas outras abordagens para o tratamento ductal do coto/enxerto pancreático, tais como: drenagem livre de secreções para o peritônio, com o ducto pancreático aberto, ligadura ductal e oclusão do ducto com polímeros sintéticos. OBJETIVO: O presente estudo visa avaliar clínica e laboratorialmente as funções endócrina e exócrina do pâncreas de coelhos com o ducto aberto e ligado. MÉTODOS: Foram realizadas 150 operações, divididas em 3 grupos: N - manipulação/controle (n=50, A - grupo aberto (n=50, e L - ligado (n=50. Os momentos de observação foram pré-operatório, dia 0 (dia da operação e pós-operatório (observação e sacrifício: 7 dias, 14 dias, 28 dias, 90 dias e 180 dias. Os parâmetros analisados foram: estado geral, atividade, controles do peso corporal, ingestão hídrica, ingestão alimentar e dosagens da amilase sangüínea, glicemia, glicose urinária e insulina plasmática. RESULTADOS: Todos os grupos tiveram evolução clínica similar, com bom estado geral, ganho ponderal progressivo e valores normais da ingestão hídrica e ingestão alimentar. Exceto uma significativa elevação da amilase sangüínea nas primeiras 24-48h para os 2 grupos com interferência ductal, não houve qualquer alteração dos níveis basais da glicemia, glicosúria e insulinemia entre os 3 grupos experimentais, em todos os momentos de observação. CONCLUSÃO: À exceção da amilase sangüínea, cujos níveis basais foram significativamente elevados no 1º e 2º dias de p

  13. Valor preditivo do resultado fetal da dopplervelocimetria de ducto venoso entre a 11ª e a 14ª semanas de gestação Predictive value for fetal outcome of Doppler velocimetry of the ductus venosus between the 11th and the 14th gestation week

    Directory of Open Access Journals (Sweden)

    Carlos Alberto Gollo

    2008-01-01

    Full Text Available OBJETIVO: estudar o valor da dopplervelocimetria do ducto venoso (DV entre a 11º e a 14º semanas de gestação, associado à medida da translucência nucal (TN, na detecção de resultado fetal adverso. MÉTODOS: foram estudados 1.268 fetos consecutivamente. Em 56 casos, realizou-se estudo citogenético no material obtido, por meio de biópsia de vilosidade coriônica e, em 1.181 casos, o resultado teve como base o fenótipo do recém-nascido. Todos os fetos foram submetidos, além da ultra-sonografia de rotina, à medida da TN e à dopplervelocimetria do DV. Trata-se de um estudo transversal e prospectivo. Foram calculados e analisados, para fins de prevalência e índices de acurácia: sensibilidade, especificidade, valor preditivo positivo (VPP, valor preditivo negativo (VPN, probabilidade de falso-positivo (PFP, probabilidade de falso-negativo (PFN, razão de probabilidade positiva e razão de probabilidade negativa. RESULTADOS: do total de 1.268 fetos, foram selecionados para análise 1.183 casos. Deste total, 1.170 fetos eram normais (98,9% e 13 fetos tiveram resultado fetal adverso ao nascimento (1,1% - incluindo morte fetal (trissomia 21 e 22 em dois casos, síndrome genética (Nooman em um caso, fetos polimalformados em dois casos, cardiopatia em três casos e outros defeitos estruturais em cinco casos. A prevalência do DV alterado (onda A zero/reversa na população estudada foi de 14 casos (1,2%, com taxa de falso-positivo de 0,7%. CONCLUSÕES: há correlação significativa entre alteração da dopplervelocimetria do DV e a medida da TN, como marcadores ultra-sonográficos de primeiro trimestre, na detecção de resultado fetal adverso, especialmente para malformações graves. O Doppler do DV foi capaz de diminuir o resultado falso-positivo, comparativamente ao uso isolado da TN, melhorando consideravelmente o VPP do teste.PURPOSE: to study the value of Doppler velocimetry of the ductus venosus, between the 11th and 14th weeks of

  14. Regional assessment of anthropogenic impacts on air, water and soil, case: Huasteca Hidalguense, Mexico; Evaluacion regional del impacto antropogenico sobre aire, agua y suelo, caso: Huasteca Hidalguense, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Gordillo Martinez, Alberto Jose; Cabrera Cruz, Rene Bernardo Elias; Hernandez Mariano, Marisol; Galindo, Erick; Otazo, Elena; Prieto, Francisco [Centro de Investigaciones Quimicas, Universidad Autonoma del Estado de Hidalgo, Pachuca, Hidalgo (Mexico)]. E-mail: gordillo@uaeh.edu.mx; rcabreracruz@yahoo.com.mx

    2010-08-15

    The state of Hidalgo, Mexico presents an important environmental problem that manifests itself in different ways. To identify the sources, types and the magnitude of pollutants, an inventory of sources of industrial and domestic pollution for air, water and soil in ten municipalities of the Huasteca Region of the state was carried out using the technique of Rapid Assessment of Sources of Environmental Pollution and the results are reported in this paper. A total of combined pollutants emitted was 116 978.95 tons/year. Gasoline vehicles contributed 11 039 tons/year of air pollutants and diesel vehicles 1521 tons/year. For water, industrial sources contributed 22 496 tons/year and domestic effluents 15 776 tons/year. Soil pollution was a result of industrial solid waste, 4025 tons/year, and municipal solid waste, 62 121 tons/year. By municipality, Huejutla de Reyes is the most polluted in air, water and soil, with 53 % of the regional total. These results were evaluated in relation to environmental quality of each medium based on the Mexican regulations; these levels are above permissible limits for water and soil. A database with relevant information was prepared as a support for efficient management of pollutant emissions, provide base mark data for complementary studies, and to promote the future conservation of environmental quality and the biological richness of the area. [Spanish] El estado de Hidalgo, Mexico presenta una importante problematica ambiental que se manifiesta de manera heterogenea a lo largo de su territorio. Existe la necesidad de conocer las fuentes, tipos de agentes contaminantes y su magnitud. En este trabajo se realizo un inventario de la contaminacion emitida por fuentes de origen industrial y domestico en aire, agua y suelo en diez municipios de la region de la Huasteca por medio de la tecnica de Evaluacion Rapida de Fuentes de Contaminacion Ambiental (ERFCA). El total de la contaminacion emitida fue de 116 978.95 ton/ano. Las emisiones al

  15. Evaluacion de mapas de disparidad

    National Research Council Canada - National Science Library

    Cabezas, Ivan; Trujillo, Maria

    2013-01-01

    Un mapa de disparidad es la salida de un algoritmo de estimacion de puntos correspondientes, el cual es estimado en una etapa intermedia del proceso de reconstruccion de la profundidad a partir de dos o mas imagenes...

  16. Technical Problems and Political Uses of National Assessments in the Argentinian Educational System Problemas Técnicos y Usos Políticos de las Evaluaciones Nacionales en el Sistema Educativo Argentino.

    Directory of Open Access Journals (Sweden)

    Silvina Gvirtz

    2006-07-01

    Full Text Available This article presents results from different research investigations which have explored the relations between the technical and the political dimension of the assessment of educational systems. The case study taken on for this matter is the national evaluation system in force in Argentina since 1993. In the first part we present some technical problems which the implementation of this system has encountered in this country. In the second part we carry out an analysis of these technical inconveniences, within the political context of educational reform in which the evaluation system arises and develops. In addition, we present an analysis of the effective use of the information provided by the evaluations. Finally, in the conclusions, we present some considerations on the role of national evaluations in educational reform contexts, and on the prospects of their consolidation as systems which inform in a valid and reliable form about the course of education in the mid and long term. Este artículo presenta resultados de investigaciones que han explorado las relaciones entre la dimensión técnica y la dimensión política de la evaluación de sistemas educativos, tomando como caso el sistema de exámenes nacionales vigente en la Argentina desde 1993. En la primera parte del trabajo exponemos algunos problemas técnicos que ha presentado la puesta en marcha del sistema de evaluación nacional en el mencionado país. En la segunda parte realizamos una lectura de estos inconvenientes técnicos en el marco del contexto político de reforma educativa en el que el sistema de evaluación surge y se desarrolla. Asimismo, analizamos los usos efectivos que se han hecho de la información provista por las evaluaciones. Por último, en las conclusiones, presentamos reflexiones acerca de la función de las evaluaciones nacionales en contextos de reforma educativa, y de las posibilidades de su consolidación como sistemas que informen de forma válida y

  17. Evaluation of a process for the removal of gases contained in geothermal steam through condensation and re-evaporation; Evaluacion de un proceso de remocion de gases contenidos en el vapor geotermico, por medio de la condensacion y de revaporacion

    Energy Technology Data Exchange (ETDEWEB)

    Angulo C, Raul; Lam Rea, Luis; Garmino, Hector; Jimenez, Humberto [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1985-12-31

    The Cerro Prieto I Geothermal Field, developed and operated by the Comision Federal de Electricidad (CFE), has currently an installed electric power generation capacity of 180 MW and is at a very advanced stage in the development of Cerro Prieto II and III, which will allow to raise the generation capacity to 620 MW. During the exploitation of a geothermal field, in producing steam with the purpose of generating electricity, brines and waste gases are obtained. The hydrogen sulfide exhaust to the environment implies pollution problems, for this reason processes have been developed for the oxidation of these gases downstream the turbogenerator either in the flow of separated gases in the steam condensation or in the condensate produced. The Instituto de Investigaciones Electricas (IIE) has collaborated with CFE in the evaluation of the environmental impact of this gas and in the development of the processes for its abatement. [Espanol] El campo geotermico de Cerro Prieto I, desarrollado y operado por la Comision Federal de Electricidad (CFE), actualmente tiene una capacidad instalada de generacion de energia electrica de 180 MW, y se encuentra en etapa muy avanzada, el desarrollo de Cerro Prieto II y III, lo que permitira incrementar la capacidad de generacion a 620 MW. Durante la explotacion de un campo geotermico, al producir vapor con el proposito de generar electricidad, se obtienen salmueras y gases de desecho. La descarga de acido sulfhidrico a la atmosfera implica problemas de contaminacion, por esta razon se han desarrollado procesos para la oxidacion de este gas aguas abajo de la turbina generadora, ya sea en la corriente de gases que se separan en la condensacion del vapor o en el condensado producido. El Instituto de Investigaciones Electricas (IIE) ha colaborado con la CFE en la evaluacion del impacto ambiental de este gas y en el desarrollo de sus procesos de abatimiento.

  18. Summary of the 2010 assessment on medium- to low-temperature geothermal resources in Mexico; Resumen de la evaluacion 2010 de los recursos geotermicos mexicanos de temperatura intermedia a baja

    Energy Technology Data Exchange (ETDEWEB)

    Iglesias, Eduardo R.; Torres, Rodolfo J.; Martinez Estrella, J. Ignacio; Reyes Picasso, Neftali [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)]. E-mail: iglesias@iie.org.mx

    2011-07-15

    geothermal systems lies between 1,168 EJ and 1,274 EJ, with 90% confidence. The statistical distribution of the (conservatively) inferred reservoir temperatures indicates that 5% of these systems have temperatures between 151 and 208 degrees Celsius, 40% of these systems have temperatures between 102 and 151 degrees Celsius, 50% of these systems have temperatures between 60 and 102 degrees Celsius, and 5% of these systems have temperatures between 36 and 60 degrees Celsius. These resources contain massive amounts of thermal energy that could be used in a wide variety of direct applications and power generation projects. Potentially they are important for the economy of 26 of the 32 Mexican States. This work does not include any attempt to estimate the recuperation factor of the estimated resources. [Spanish] En 2003 publicamos nuestra primera estimacion de los recursos geotermicos mexicanos de temperatura intermedia a baja (T {<=} 200 grados centigrados) con base en datos de 1358 manifestaciones superficiales identificadas en ese momento. Debido a falta de informacion en uno o mas parametros relevantes, como coordenadas geograficas, temperatura de muestra o del yacimiento, etc., dicha evaluacion incluyo aproximadamente 30% de las manifestaciones identificadas. Desde entonces nuestro grupo incremento significativamente la cantidad de la informacion en la base de datos, mediante compilacion de datos de diferentes fuentes y trabajo de campo. Posteriormente desarrollamos una base de datos relacional y la implementamos en un Sistema de Informacion Geografica (SIG). En este trabajo presentamos un resumen de nuestra evaluacion 2010 de los recursos geotermicos mexicanos de temperatura intermedia a baja resultante de nuestra base de datos actualizada, que incluye 2361 manifestaciones geotermicas. Como en la version precedente, utilizamos el metodo volumetrico y simulaciones Montecarlo para estimar los recursos geotermicos y sus correspondientes incertidumbres para cada sistema

  19. Heat transformers simulation coupled to industrial processes and experimental evaluation of a thermal transformer of two KW power; Simulacion de transformadores de calor acoplados a procesos industriales y evaluacion experimental de un transformador termico de dos kw de potencia

    Energy Technology Data Exchange (ETDEWEB)

    Cerezo Roman, Jesus

    2001-12-15

    recovering temperature and between 42% and 96% at high temperature for the use of this additives. [Spanish] La quema de combustibles primarios en los diferentes sectores industriales y de transporte, han provocado grandes problemas de salud a la humanidad y contaminacion al medio ambiente, debido principalmente a sus altas emisiones de sustancias y gases, ademas de problemas socioeconomicos en muchos paises. Debido a esto, muchos paises estan investigando nuevas tecnologias alternas para su sustitucion. Uno de los principales tecnologias propuestas son los transformadores de calor. Estos equipos son capaces de ahorrar energia calorifica principalmente en procesos industriales. Debido a esto, estas tesis realiza estudios teoricos de transformadores de calor en procesos industriales tipicos de la region como es la destilacion de derivados de petroleo y refinacion de azucar morena, para observar la energia que puede ser ahorrada por el uso de estos equipos. Por otra parte se realizo una evaluacion experimental de un transformador de calor con aditivos debido a que aumentan la absorcion en el absorbedor, mejorando el coeficiente de operacion. En la simulacion de la columna de destilacion de petroleo se utilizo el simulador de procesos quimicos Aspen Plus version 9.3-2, debido a que este tiene modelos termodinamicos muy confiables para estudiar el comportamiento de cada uno de sus componentes. Los resultados mostraron que con el transformador de calor de una etapa operando con la mezcla LiBr-H{sub 2} O se puede ahorrar hasta un 45% de la energia suministra a la caldera y hasta un 32% con el transformador de doble absorcion. Para la modelacion de la refineria del azucar morena se uso el paquete Visual Basic, version 6.2. El paquete fue utilizado debido a que es un lenguaje grafico y de facil manejo. Los resultados mostraron que se puede recuperar hasta un 15% de la energia suministrada a la caldera. En la experimentacion se utilizo la mezcla bromuro de litio-agua y bromuro de

  20. On-line chemical cleaning of pipelines; Limpieza quimica de ductos en linea

    Energy Technology Data Exchange (ETDEWEB)

    Cross, Michael Brent [Brenntag Stinnes Logistics, Muelheim/Ruhr (Germany)

    2003-07-01

    The concern of efficiency and maintenance in the pipeline industry, due to fluids and sediments, has led the development of new methods of cleaning. Some methods of cleaning are described in this work with their advantages and disadvantages.

  1. Evaluacion del dolor musculoesqueletico en el anciano

    National Research Council Canada - National Science Library

    Arteaga, Carlos Ernesto; Santacruz, Juan Guillermo; Ramirez, Lizeth Jazmin

    2011-01-01

    Proposito: las afecciones musculoesqueleticas son causa frecuente de dolor y discapacidad en el anciano, el conocimiento de estas patologias se hace necesario dado que la presentacion de algunas de ellas son...

  2. EVALUACION DEL IMPACTO AMBIENTAL EN OBRAS VIALES

    Directory of Open Access Journals (Sweden)

    Wilfredo Martínez D.

    2014-11-01

    Full Text Available El presente artículo es escrito, con el propósito de proporcionar elementos técnicos que contribuyan para orientar a los equipos de trabajo multidisciplinario, en valorar objetivamente los impactos ambientales provocados por la construcción de obras civiles y que suscitan el interés del dominio público y profesionales en la materia. Para ello hemos contado con la experiencia acumulada en instituciones gubernamentales y de índole privado y con nuestra experiencia profesional, en la construcción de obras civiles. El contenido del mismo, toma en cuenta varios criterios de especialistas en la materia y recursos disponibles; con ética y rigurosidad técnica. El objetivo de la evaluación de impactos ambientales, es predecir sobre la marcha y a futuro, estados alternativos de recursos y ambiente; convencidos que el cuido de la naturaleza puede convocar la voluntad de todas las partes y lograr trabajar armoniosamente, por la construcción de un futuro con desarrollo sostenible para nuestra nación y generaciones posteriores; satisfaciendo las necesidades del presente, sin poner en riesgo los recursos del futuro.

  3. Software hipermedia para apoyo de evaluaciones automatizadas

    OpenAIRE

    Grosclaude, Eduardo

    2003-01-01

    Las organizaciones educativas requieren adecuado soporte informático para la optimización de procesos colaborativos en la enseñanza. Se necesita definir una arquitectura de desarrollo de estas aplicaciones sobre sistemas distribuidos. Se presentan los objetivos de un proyecto de investigación sobre Software para Procesos Colaborativos, en el marco del cual se han desarrollado dos aplicaciones experimentales para apoyar la evaluación automatizada. Se describen estas aplicaciones, sus resultado...

  4. SINTESIS Y EVALUACION DE TERPENOS BIOLOGICAMENTE ACTIVOS

    National Research Council Canada - National Science Library

    Miguel A GonzÁlez

    2014-01-01

    ... de terpenos de origen natural, los cuáles junto a sus precursores han sido estudiados biológicamente durante más de diez años fruto de la colaboración con la Universidad de Antioquia representada por la profesora Liliana Betancur Galvis. Así pues, es de nuestro interés destacar en esta comunicación o ponencia los resultados obtenidos fruto de la col...

  5. Thermal evaluation by means of simulation of two houses with different materials in the city of La Paz, B.C.S.; Evaluacion termica mediante simulacion de dos casas con materiales diferentes en la ciudad de la Paz, B.C.S.

    Energy Technology Data Exchange (ETDEWEB)

    Resendiz Pacheco, Oscar; Morillon Galvez, David; Chavez M, Elizabeth; Poujol G, Federico; Flores I, Alfredo [Universidad Autonoma de Baja California Sur (Mexico)

    2009-01-15

    In this article the evaluation of two houses of social interest in the city of La Paz is presented, in terms of the thermal comfort that could be offered to their users with a minimum cost of energy by means of a simulation of their thermal behavior with the program TRNSYS. One of the houses is constructed in a large extent with adobe, for the walls and brick for the ceilings and the other is a typical construction of social interest built with conventional materials. The obtained results are presented, with which some recommendations that can be made tending to improve comfort and energy saving in houses of social interest. These recommendations consider the type of material as much as the geometry of the houses. [Spanish] En este articulo se presenta la evaluacion de dos casas de interes social para la ciudad de La Paz, en terminos del confort termico que pudieran ofrecer a sus usuarios con un gasto minimo de energia mediante una simulacion de su comportamiento termico con el programa TRNSYS. Una de las casas esta construida en su mayor parte con adobe, para las paredes y ladrillo para los techos y la otra es una construccion tipica de interes social construida de materiales convencionales. Se presentan los resultados obtenidos, con los que se pueden hacer algunas recomendaciones tendientes a mejorar confort y ahorro de energia en casas de interes social. Estas recomendaciones consideran tanto el tipo de material como la geometria de las casas.

  6. Revisión sistemática de evaluaciones económicas de fármacos antivirales para el tratamiento de la hepatitis B crónica Economic evaluation of antiviral treatment for chronic hepatitis B: a systematic review

    Directory of Open Access Journals (Sweden)

    Lely Solari

    2010-03-01

    Full Text Available Objetivo. Revisar la evidencia disponible acerca de la costo-efectividad de los regímenes antivirales en el tratamiento de la hepatitis B crónica. Material y Métodos. Se realizó una revisión sistemática de las bases de datos de MEDLINE, LILACS, NICE guidelines y COCHRANE sobre evaluaciones económicas de regímenes antivirales para el tratamiento de hepatitis B crónica. Se incluyó los estudios originales, revisiones sistemáticas y guías de manejo conteniendo información acerca de la costo-efectividad de dicho tratamiento. Se registró las características y resultados de los documentos obtenidos. Resultados. Se obtuvo 29 artículos originales, cuatro artículos de revisión y cuatro guías de manejo clínico. La mayoría de las publicaciones fueron hechas en los cinco últimos años. Los autores tenían conflicto de interés, por trabajar en la industria farmacéutica, en 73% de los artículos originales. El 93% de los artículos que evalúan costo-efectividad de brindar tratamiento para hepatitis B crónica frente a manejo de complicaciones, encuentran que es costo-efectivo el tratamiento antiviral; 3/6 estudios que evalúan lamivudina frente a otros esquemas la encuentran como estrategia dominante, 3/5 encuentran a entecavir como estrategia dominante, 1/1 a tenofovir como dominante, 1/4 a interferón convencional como dominante y ninguno encuentra a adefovir ni interferón pegilado como estrategia dominante. Conclusiones. Consideramos que la evidencia disponible sugiere que brindar tratamiento antiviral para hepatitis B crónica sea una intervención costo-efectiva para muchos sistemas de salud, incluyendo el nuestro, con índices variables de costo-efectividad de acuerdo con los esquemas evaluados. Idealmente, se debe realizar evaluaciones económicas locales en este aspecto.Objective. To revise the available evidence on the cost-effectiveness of antiviral regimens for treatment of chronic hepatitis B. Material and methods. We

  7. Evaluation of criteria of environmental fitness for popular houses of the low income sector to arid regions in Mexicali, Baja California; Evaluacion de criterios de adecuacion ambiental para la vivienda popular de sectores de bajos ingresos al clima calido extremo de Mexicali, B.C.

    Energy Technology Data Exchange (ETDEWEB)

    Corral Martinez, Maria [Universidad Autonoma de Baja California, Mexicali, Baja California (Mexico)

    2000-07-01

    The main purpose of this work is to present the impact on minimizing thermal loads, the traditional bioclimatic criteria commonly utilized on low income housing types in Mexicali, B.C., Mexico by showing the results of dynamic thermal evaluation based in the DOE 2.1e software as well as its technical description, with the purpose of providing recommendations for low income popular houses on arid regions, due to the high reduction percentages that can be obtained during summertime. Therefore, having the data obtained from the field as a starting point, the thermal problematic in popular housing is detected. A properties is chosen from a representative range of government supported housing types named progressive housing which are offered an financially available to the large low income popular sector in order to determine the thermal environmental function using the DOE 2.1e software and a gnomon analysis. To conclude evaluations showed that by integrating and applying traditional thermal and environmental strategies that are commonly used in this region, it is possible to reduce as much 50% of the annual cooling internal load, enhancing thermal comfort conditions in natural bioclimatic way. [Spanish] El objetivo de este trabajo es mostrar el impacto en la reduccion de la carga interna de enfriamiento, de los criterios de adecuacion ambiental que tradicionalmente se aplican en la vivienda de Mexicali, B.C., Mexico presentando los resultados de una evaluacion termica en estado dinamico con el programa DOE 2.1e y la descripcion tecnica de las mismas, con el proposito de hacer recomendaciones para la vivienda popular de bajos ingresos en zonas aridas. Para ello a partir de informacion de campo se detecta la existencia de problema termico en la vivienda popular. Se revisa un prototipo representativo de los programas oficiales de vivienda ofrecido a los sectores populares denominado vivienda progresiva, a fin de establecer el grado de adecuacion termico ambiental con el

  8. Pipeline inspection - failures selection and results obtained; Inspeccion interna de ductos - seleccion de fallas y resultados obtenidos

    Energy Technology Data Exchange (ETDEWEB)

    Motylicki, Juan Enrique [Oleoductos del Valle S.A. (OLDEVAL S.A.), (Argentina)

    2003-07-01

    The main objective of the pipelines maintenance is to assure the integrity of them in order to have a reliable operation and with an acceptable level of risk that minimizes the impact to people, to the environment and the business. The objective of this work is to expose the experiences obtained before by Oldelval and after the passages of the intelligent pig, carried out in the years 1999/2000. In the same one they will be described: How the flaws were selected to verify / to repair. Results obtained in digs. Laboratory studies to determine like they affect to the integrity of the pipeline, the different types of opposing plane defects. Conclusions. (author)

  9. Treatment of Dupuytren’s contracture with collagenase clostridium histolyticum under clinical practice conditions: ReDUCTo study

    Directory of Open Access Journals (Sweden)

    Haerle, Max

    2015-08-01

    Full Text Available Background: To date, real-life data on non-surgical correction of Dupuytren’s contracture with collagenase clostridium histolyticum injection (CCH, Xiapex are limited. Methods and results: In an open-label non-interventional study in in Germany (mean age 65.1±9.8 years, 79.3% males, patients were followed up until 1 year after injection. 63 (73.3% received the injection at the MCP joint, and 23 (26.7% at the PIP. The mean grade of contracture in the presently treated finger at baseline was for the MCP joint 32.4°±25.1, for the PIP° 29.2±31.5, and for the DIP° 0.5±2.0. At days 30/360 compared to baseline, the degree of contracture of the MCP joint was reduced by 28.2°±24.6/30.8°±25.0, of the PIP by 20.0°±24.7/8.5°±29.6, and of the DIP by 0.01°±1.9/0.7±2.3. Improvement of hand function at day 30/360 was rated by physicians as very good in 69.5/60.9%, as good in 23.2/28.3%, and as poor in 7.3/8.7%, and none in 0.0/2.2%. No serious adverse drug reactions (SADR occurred. Adverse drug reactions (ADR were noted within injection in 64 patients (74.4%, mostly contusion/swelling, pain, blood blister or other bleeding at the injection site, or ecchymosis. In an overall assessment, at day 30/360, 73.5%/95.7% of the physicians rated tolerability of CCH in their patients as very good, 22.9%/2.2% as good, and 3.6%/2.2% as moderate. On the EQ-5D Visual Analog Scale the mean score improved from 79.5±17.9 to 83.8±15.8 at day 30, and to 85.4±14.1 at day 360. On the Michigan Hand Questionnaire, the total score was 67.5 points at baseline, at day 30 and 75.2 points at day 360.Conclusions: Overall, treatment with CCH under clinical practice conditions was effective and well tolerated. Quality of life and hand function improved substantially. No unknown safety issues were identified during the study.

  10. Long term vision on the use of the renewable energies in Mexico: Solar energy. First Part: Evaluation of the Solar Resource in Mexico (Annexe 6-I in 'A vision of year 2030 on the use of the renewable energies in Mexico'); Vision a largo plazo sobre la utilizacion de las energias renovables en Mexico: Energia solar. Primera Parte: Evaluacion del Recurso Solar en Mexico (Anexo 6-I en 'Una vision al 2030 de la utilizacion de las energias renovables en Mexico')

    Energy Technology Data Exchange (ETDEWEB)

    Estrada Gasca, Claudio A; Arancibia Bulnes, Camilo A; Dorantes Rodriguez, Ruben; Islas Samperio, Jorge; Muhlia Velasquez, Agustin [Universidad Nacional Autonoma de Mexico (Mexico)

    2005-08-15

    The application of the solar energy requires an evaluation of the solar resource. It is understood by evaluation the determination of the amount of solar energy available to be used in an application; from the point of view of the present applications it is advisable to distinguish two: the direct solar radiation and the diffuse solar radiation, that conform what it is known as the global solar radiation, or hemispheric. All the solar collectors have capacity to use the direct radiation, their capacity to use diffuse radiation depends on the concentration factor of the radiation that characterizes them. Another distinction that can be done is the measurement of different parts from the spectrum. It is not simple to predict the value of the solar radiation in a site or given moment, this has implications in the design of solar facilities, which are constructed to operate during a large number of years. [Spanish] La aplicacion de la energia solar requiere una evaluacion del recurso solar. Se entiende por evaluacion a la determinacion de la cantidad de energia solar disponible para ser utilizada en una aplicacion; desde el punto de vista de las aplicaciones actuales conviene distinguir dos: la radiacion solar directa y la radiacion solar difusa, que conforman lo que se conoce como la radiacion solar global, o hemisferica. Todos los colectores solares tienen capacidad de utilizar la radiacion directa, su capacidad de usar radiacion difusa depende del factor de concentracion de la radiacion que los caracteriza. Otra distincion que se puede hacer es la medicion de diferentes partes del espectro. No es sencillo predecir el valor de la radiacion solar en un sitio o momento dado, esto tiene implicaciones en el diseno de instalaciones solares, las cuales se construyen para operar durante un numero grande de anos.

  11. Using Assessments for Instructional Improvement: A Literature Review El uso de evaluaciones para la mejora de la enseñanza: Una revisión bibliográfica O Uso de Avaliações para o Aperfeiçoamento do Ensino: Uma Revisão da Literatura

    Directory of Open Access Journals (Sweden)

    Viki M. Young

    2010-08-01

    evaluación. Identificamos oportunidades para investigaciones relevantes que pueden aclarar cómo y bajo qué condiciones los maestros y las escuelas pueden utilizar  datos  de las evaluaciones para mejorar la enseñanza.
    Os discursos recentes sobre a reforma da políticas educativas pressupõem um papel central dos "dados" na melhoria do ensino. No entanto, a forma como os "dados" podem ajudar a melhorar o ensino também depende de outros fatores, como as práticas de avaliação dos professores, quais dados são relevantes e úteis para eles, que os dados sejam geralmente acessíveis, e conhecimento, conteúdo e pedagogia dos professores. Além disso, considerando os contextos de trabalho dos professores é claro que a liderança nas escolas, o apoio à utilização de dados institucionais, as estratégias de formação e as normas de aprendizagem e colaboração para os adultos limitam as oportunidades de analisar dados relevantes e melhorar as práticas docentes. Esta revisão da literatura investiga características e práticas educacionais e organizacionais relacionadas com usos formativos da avaliação. Identificamos oportunidades para pesquisas relevantes que podem esclarecer como e em que condições os professores e as escolas podem utilizar os dados da avaliação para melhorar o ensino.

  12. Evaluacion del factor central y periferico en fatiga muscular

    OpenAIRE

    Marcela E. Panizza; Cohen, L.G.; Olga P. Sanz; R. Rey; Schutz, C

    1983-01-01

    Se estúdio la fatiga muscular en 13 sujetos normales; para ello, fueron sometidos a un esfuerzo sostenido durante 10 minutos previo y posterior, al cual se realizo la medición de la onda M máxima. Durante el esfuerzo y cada 2 minutos, se obtuvieron cuantificaciones de la frecuencia y duración de las ondas positivas y negativas del EMG. Los resultados, mostraron diferencias significativas de estos valores, en función del tiempo de esfuerzo realizado, mientras que las mediciones de la onda M má...

  13. DISEÑO, SINTESIS Y EVALUACION DE UN NANOSENSOR PREFLUORESCENTE

    OpenAIRE

    CELIS BOZO, FREDDY ESTEBAN

    2013-01-01

    En esta tesis, se estudiaron sondas prefluorescentes. Estas sondas, están constituidas por una sal de piridinio fluorescente (debido a su versatilidad sintética) y un fragmento de TEMPO (2,2,6,6-tetrametilpiperidina-1-oxilo) que ha sido unido covalentemente. Se caracterizaron y estudiaron las propiedades fotofísicas de sales de piridinio. Las sondas obtenidas fueron capaces de estudiar la transferencia de radicales hidrógeno. Las técnicas utilizadas en la evaluación y caracterización...

  14. TRATAMIENTO MEDICO DEL EMBARAZO ECTOPICO: EVALUACION PROSPECTIVA DE LA FERTILIDAD

    OpenAIRE

    Troncoso J,José Luis; Devoto C,Luigi; Santamaría M.,Rodrigo; Fuentes G,Ariel

    2002-01-01

    Se presenta la evaluación reproductiva, a través del método de las tablas de vida, aplicado a una cohorte de 16 pacientes tratadas con metotrexato parenteral por embarazo ectópico, en el período comprendido entre julio de 1993 y julio de 2002. Estudio realizado en el Instituto de Investigaciones Materno-Infatil, Universidad de Chile y Servicio de Ginecología. Hospital San Borja-Arriarán e Integramédica, división Ginecología. Todas las pacientes negativizaron la gonadotrofina coriónica. La per...

  15. Modelo para caracterizar las evaluaciones administrativas de posgrados

    Directory of Open Access Journals (Sweden)

    Jaime Antonio Benítez Forero

    2012-03-01

    Full Text Available This article discloses a study model for the characterization of the evaluation process at the administrative level of graduate programs for the transport improvements and program changes through the use of responsive evaluation developed by Robert Stake. This approach to education is an integral and comprehensive way in contrast to the formal assessment that focuses on a few variables of the graduate program under evaluation. Based on the above, this study shows the results obtained from the characterization of the administrative assessment of a master.

  16. Herramientas para la evaluacion de la accesibilidad web

    National Research Council Canada - National Science Library

    Serrano Mascaraque, Esmeralda

    2009-01-01

    .... En este articulo, se recogen las herramientas de validacion automatica mas extendidas y los principales programas para facilitar la accesibilidad y navegadores utilizados por personas que presentan...

  17. Evaluacion continua en la UNED ¿Una mision posible?

    Directory of Open Access Journals (Sweden)

    Sanz Carnero, Basilio

    2008-01-01

    Full Text Available En este curso 2007-2008 se ha publicado en la UNED la II convocatoria de redes de innovación docente, en cuyo marco estamos realizando una humilde experiencia, que trata de explorar las posibilidades actuales de llevar a cabo, en una de nuestras asignaturas de matemáticas (Licenciatura de economía una especie de evaluación continua mixta: on-line y presencial, la comunicación, trata de narrar el desarrollo de esta experiencia y extraer una serie de conclusiones sobre la posibilidad de llevarla a cabo por nuestra universidad en el curso 20010-2011 dependiendo de los medios humanos y materiales puestos a su servicio.

  18. SISTEMAS DE EVALUACION DE CONTENIDOS EN TELEFORMACION: EL PROYECTO CFV

    Directory of Open Access Journals (Sweden)

    Rosa Maria Bo

    1999-08-01

    Full Text Available La evaluación del rendimiento de los alumnos en los sistemas basados en teleformación es uno de los temas claves como en cualquier programa de formación. Este proceso presenta las características básicas comunes con los restantes programas de formación y añade las propias de este acercamiento. Vamos a revisar algunas de las mismas, situándolas dentro de la experiencia y alternativas que actualmente están disponibles y, particularmente, desde la perspectiva que a este respecto se desarrolla en el proyecto CFV

  19. LA EVALUACION EN LA ESCUELA: UNA AYUDA PARA SEGUIR APRENDIENDO

    Directory of Open Access Journals (Sweden)

    LaCueva Aurora

    1997-01-01

    Full Text Available EI trabajo llama la atención sobre algunos de los principales problemas que puede presentar la práctica de la evaluación en la escuela: el énfasis en los aprendizajes más superficiales y de menor nivel, la ilusión totalizante, el imposible diagnóstico como paso previo a toda enseñanza, el esencialismo, el error tomado como anormalidad, el papel etiquetador de la nota, la instrumentalización engañosa, el crecimiento desmesurado de la acción evaluadora como juicio y sentencia. Frente a estas peligrosas deformaciones, se propone una evaluación como ayuda para seguir aprendiendo, incorporada a la actividad normal de una escuela rica en experiencias formativas. Una evaluación abierta y flexible, realizada a partir de los procesos y productos cotidianos en el aula de clases. Tablas y gráficos pueden sustituir con provecho a las calificaciones. Las fichas de registro, el portafolio, el seguimiento atento del docente, son mecanismos para ir acompañando y sosteniendo el aprendizaje infantil. La autoevaluación y la coevaluación resultan parte importante del proceso. La evaluación debe estar complementada con medidas de apoyo, dirigidas a facilitar a los aprendices la superación de sus insuficiencias

  20. Evaluacion del desempeno atencional en ninos: eficacia, eficiencia y rendimiento

    National Research Council Canada - National Science Library

    Monteoliva, Juan Manuel; Ison, Mirta Susana; Pattini, Andrea Elvira

    2014-01-01

    .... La importancia del desarrollo de los procesos de aprendizaje genera la necesidad de evaluar las habilidades atencionales de los ninos en el ambito educativo con instrumentos validos, confiables...

  1. Consideraciones acerca de la objetividad en evaluacion psicologica

    Directory of Open Access Journals (Sweden)

    Claribel Morales de Barbenza

    2001-01-01

    Full Text Available Sobre la base de diferentes abordajes teóricos cognitivos y constructivistas, en el presente trabajo se analiza el alcance del concepto de objetividad como contrapuesto al de subjetividad. Se hace referencia a los procesos basados en los esquemas propuestos por Beck (1988 y a los tres niveles de cognición explicitados recientemente por Alford y Beck (1997, a la teoría de los constructos personales de Kelly (1963 Ya la relevancia que Mahoney (1985, 1989 otorga a la significación que cada persona construye acerca de sí misma y del mundo. Los autores mencionados, en distintos momentos de la evolución de sus respectivas teorías, coinciden en reconocer -lo mismo que Vygotsky (1934,1995 Ylos psicólogos sociales en general - que el significado, si bien es idiosincrático, se construye necesariamente bajo la influencia de la cultura. En el marco de la evaluación psicológica se enfatiza la importancia que reviste la construcción de los significados personales y la necesidad de lograr espacios de significación compartida cuando se interactúa con una persona durante el proceso de evaluación. Se hace referencia a la valiosa y fructífera contribución de los estudiosos del inconsciente cognitivo (Froufe, 1997; Meichenbaum & Gilmore, 1984; Orbach, 1995, y a los aportes brindados por la teoría de la atribución al estudio del proceso de evaluación psicológica. Luego de des- tacar la responsabilidad del psicólogo frente a la labor evaluativa, se concluye que es preciso admitir la relatividad del concepto de objetividad cuando se plantean los alcances de su aplicación en el área de la evaluación y del diagnóstico psicológico.

  2. Evaluacion de las leyes: lecciones de la criminologia

    National Research Council Canada - National Science Library

    Rubio, Mauricio

    2008-01-01

    .... De la criminologia, una disciplina auxiliar del derecho penal, se pueden obtener valiosas lecciones practicas, teoricas y normativas, por ejemplo, en su manera de abordar el tema de la recoleccion de informacion...

  3. EVALUACION CLINICA DE RESTAURACIONES CERVICALES REALIZADAS CON UN COMPOMERO

    OpenAIRE

    Lahoud S., Víctor; Director de la EAP. Coordinador del Departamento Estomatología Rehabilitadora.; Ortíz C., Eduardo; Profesor asociado Departamento Estomatología Rehabilitadora.; Uriarte M., Carlos; Profesor asociado Departamento Estomatología Biosocial.

    2014-01-01

    There were select 60 dentarys pieces with caries or cervical abrassions, they divided in 2 groups: Group I 30 Teeth repared with Compómero and Group II: 30 Teeth repared with 1ónomero, that was because we want to evaluate the clinic officience during 24 months. The results shows that the restorations presented color stable, excelent integration marginal and resistence the storege and permanenay during 23 months in all cases estudies. Fueron seleccionadas 60 piezas dentarias con caries o ab...

  4. Evaluacion del factor central y periferico en fatiga muscular

    Directory of Open Access Journals (Sweden)

    Marcela E. Panizza

    1983-09-01

    Full Text Available Se estúdio la fatiga muscular en 13 sujetos normales; para ello, fueron sometidos a un esfuerzo sostenido durante 10 minutos previo y posterior, al cual se realizo la medición de la onda M máxima. Durante el esfuerzo y cada 2 minutos, se obtuvieron cuantificaciones de la frecuencia y duración de las ondas positivas y negativas del EMG. Los resultados, mostraron diferencias significativas de estos valores, en función del tiempo de esfuerzo realizado, mientras que las mediciones de la onda M máxima inicial y final, no fueron diferentes, todo lo cual lleva a jerarquizar el factor central como el más importante en el desarrollo de fatiga, bajo nuestras condiciones de estudio, que son además de sencilla aplicación clínica.

  5. Evaluacion entre colegas profesores (Peer Review of Teachers). ERIC Digest.

    Science.gov (United States)

    Hertling, Elizabeth

    This digest in Spanish examines peer review, focusing on how these types of reviews can improve teacher competence. Peer review is often linked to peer assistance, which helps new and veteran teachers improve their knowledge and skills. In peer-review programs, consulting teachers conduct formal evaluations and recommend whether the participating…

  6. LA EVALUACION DE LA PENALIZACIÓN AL DELINCUENTE

    Directory of Open Access Journals (Sweden)

    Diego Becerril Ruiz

    2014-12-01

    Full Text Available The social perception of the penalization of the crimes is a key to understanding the social dynamics and its relation to criminal proceedings element. It is used as a justification for criminal expansionist policy, always founded on worry or alarm. The paper analyzes the evolution of the sufficiency of punishment during the last 35 years (1980-2014 and the assignment of responsibilities. Next to the description and evolution has built a favorable profile people toughen punishment. The data source are secondary, surveys conducted by the Centre for Sociological Research (CIS, the Eurobarometer and the European Social Survey. The scope is national. The main conclusions are that the evaluation of justice as benevolent and fondness for harsher punishments draw a trend of steady increase, unless exceptional falls. This attitude is more pronounced among people with lower level of education, women, elderly, ideologically right, lower income and Catholics. The responsibility of insufficient punishment is mainly ascribed to the entire system, except the police, although the structural elements (judicial organization laws more than functional (judges, prosecutors.

  7. Assessment of output losses; Evaluacion de perdidas de rendimiento

    Energy Technology Data Exchange (ETDEWEB)

    Baraza Peregrin, A.

    2010-07-01

    Output losses are mainly produced by the ageing of equipment, which makes its efficiency decreasing, or else by be operating under different design conditions. There are also seasonal causes that make difficult to identify these losses, as room temperature or reactive power. This study is focused on Cofrentes Nuclear Power Plant.

  8. EVALUACION DEL POTENCIAL DE LOS RECURSOS GENETICOS DE PAPA

    Directory of Open Access Journals (Sweden)

    Ligarreto M. Gustavo A.

    2003-08-01

    Full Text Available

    El objetivo del trabajo fue evaluar 50 accesiones de papa

    criolla especie Solanum phureja Juz et Buk por parámetros

    que requiere la industria de procesados, en esta colección

    se ha reportado la existencia de variabilidad genética pero

    se desconoce su calidad para la industria. Se evaluaron 17

    variables: 10 variables cualitativas y 7 variables cuantitativas.

    Las variables cualitativas permitieron evaluar morfológicamente

    el tubérculo y las cuantitativas determinaron

    el comportamiento agronómico de los cultivares en el

    ambiente. Los datos obtenidos fueron sometidos a análisis

    de correlación, y componentes principales y análisis de

    conglomerados. Se encontró que los tres primeros componentes

    principales expresaron el 85% de la variabilidad

    total, donde las características más importantes fueron:

    diámetro ecuatorial 1, diámetro ecuatorial 2, diámetro

    longitudinal, gravedad especifica y contenido de azucares

    reductores. El análisis de conglomerados mostró cuatro

    grupos con subgrupos donde los subgrupos 2a y 3d presentaron

    las accesiones con mejores características industriales.

    Los genotipos que presentaron mejores características

    para el procesamiento industrial y que ameritan su evaluación

    en otros ambientes fueron: encurtido en salmuera

    o vinagre. 16, 20, 21, 68, 79, 80 y 81 ; papa precocida

    enlatada o congelada. 16, 20 y 21 y papa frita en hojuela el

    cultivar 23. El trabajo se realizó en la Corporación Colombiana

    de Investigación Agropecuaria, Corpoica, Regional

    Uno, Centro de Investigación Tibaitatá en Mosquera.

  9. Evaluacion de proyectos de servicio social en una universidad mexicana

    National Research Council Canada - National Science Library

    Navarrete-Ramirez, Ana Maria; Barrera-Bustillos, Maria Elena; Martin-Pavon, Mario J

    2010-01-01

    El objetivo del estudio era determinar la calidad de los proyectos de servicio social en que participan estudiantes de la Universidad Autonoma de Yucatan, considerando la opinion de los prestadores...

  10. Análisis numérico del flujo en ducto con 3 diferentes relaciones de contracción

    Directory of Open Access Journals (Sweden)

    Oscar A. Morales C

    2014-08-01

    Full Text Available En esta investigación se presentan los resultados numéricos de la influencia de la relación de aspecto y el número de Reynolds en el comportamiento del flujo laminar en un conducto rectangular con escalón (FFS. Se analizan 3 diferentes Reynolds (300, 400 y 500 y 3 diferentes relaciones de contracción (8, 4 y 2.7. El estudio numérico se realiza con el programa desarrollado denominado FLUSS, el código está basado en la técnica de volúmenes finitos y el algoritmo SIMPLE, la validación del código numérico se realiza comparando con los resultados experimentales obtenidos mediante la técnica láser de velocimetría de imágenes de partículas. Los resultados numéricos y experimentales presentan una diferencia máxima del 4%.

  11. Suprapapillary needle puncture for common bile duct access: laboratory profile Punção suprapapilar por agulha para acesso ao ducto biliar comum: perfil laboratorial

    Directory of Open Access Journals (Sweden)

    Everson L. A. Artifon

    2006-12-01

    Full Text Available BACKGROUD: Biliary cannulation to perform endoscopic retrograde cholangiopancreatography may be difficult due to technical reasons and often is necessary to perform papillotomy, where complications as pancreatitis and perforation may occur AIM: To show minimal complications by a new model of biliary access by means of the suprapapillary needle puncture and its laboratory profile. PATIENTS AND METHODS: After the approval of the protocol by the Scientific Ethics Committee of the institution a free and informed consent was signed by all patients participating in the study. From July 2003 to August 2004, fulfilling the inclusion and exclusion criteria, 30 patients were selected for endoscopic retrograde cholangiopancreatography, using the suprapapillary puncture technique. All patients remained hospitalized, fasting and with basal hydroelectrolytic replacement, were clinically followed up and samples for the determination of serum amylase, lipase and C-RP (C-reactive protein were collected before and 4 h, 12 h and 24 h after the procedure and reevaluated 60 days after the procedure. Laboratory parameters were submitted to statistical study using analysis of variance for repeated measurements. Multiple comparisons were made based on Wald's statistics RESULTS: The technique was successful in 93.4% (28/30 of the patients. No statistically significant difference regarding to the laboratory profile were observed. Complications related to the technique of papillary puncture occurred in 1/28 patients by not using the guide wire and in 1/28 where mild hemorrhage after dilation of the papillary fistula occurred. Regarding complications related to therapeutic procedures, there were 2/28 retroduodenal perforations, with one (1/30 following unsuccessful puncture and another due to the passage of Dormia's basket through the dilated fistula path. All patients submitted to diagnostic puncture and evaluated 60 days after the procedure presented with the major duodenal papilla of normal aspect. The patients with dilation of the suprapapillary fistula showed the fistula continuing to drain clear bile CONCLUSION: Suprapapillary puncture allows investigative and therapeutic procedures without significant increases in amylase, lipase and C-RP. Patients submitted to diagnostic puncture present complete recovery of the papilla, while dilation of the fistula maintains it pervious later on, but without complications.RACIONAL: A cateterização para acesso às vias biliares na colangiopancreatografia retrógrada pode apresentar dificuldades técnicas, sendo necessário freqüentemente efetuar-se papilotomia, procedimento não isento de complicações como perfuração e pancreatite OBJETIVOS: Demonstrar menor incidência de complicações a partir do perfil laboratorial, através de nova técnica desenvolvida, a punção suprapapilar MATERIAL E MÉTODOS: Após aprovação pelo Comitê de Ética em Pesquisa da instituição, 30 pacientes foram selecionados no período de julho de 2003 a agosto de 2004. Preenchidos os critérios de inclusão e exclusão, os pacientes, após explicação do protocolo e a assinatura do consentimento livre e esclarecido, foram submetidos a colangiopancreatografia retrógrada pela técnica de punção suprapapilar. Após o procedimento, foi feito seguimento com o paciente internado para avaliar possíveis complicações, bem como determinação dos níveis séricos da amilase, lipase e proteína C reativa nas 4 h, 12 h e 24 h subseqüentes e reavaliados 60 dias após. O estudo estatístico foi feito por análise de variância para medidas múltiplas e comparações múltiplas foram feitas por meio do teste de Wald RESULTADOS: O sucesso da técnica ocorreu em 93,4% (28/30 dos pacientes. Não foram observadas alterações estatisticamente significantes no perfil laboratorial. Complicações relacionadas à técnica de punção ocorreram em dois pacientes: um pelo não uso do fio guia e em outro por hemorragia, após dilatação da papila. Relacionadas ao procedimento, ocorreram duas perfurações retroduodenais: uma decorrente de punção e outra após passagem do cesto de Dormia pela fístula dilatada. Após seguimento de 60 dias, nenhuma complicação foi observada CONCLUSÃO: Punção suprapapilar permite procedimentos investigativos e terapêuticos sem aumento significativo da amilase, lipase e proteína C reativa. Na punção diagnóstica ocorre reepitelização completa da papila, enquanto na dilatação da fístula mantém-se a perviedade, porém sem complicações.

  12. Detection of leaks for radioactive tracer in marine duct for transport of liquefied petroleum gas; Deteccion de fugas por radiotrazado en ducto marino para transporte de gas LP

    Energy Technology Data Exchange (ETDEWEB)

    Robles P, E. F.; Benitez S, J. A.; Torre O, J. de la; Cruz S, E. de la; Molina, G.; Hernandez C, J. E.; Flores M, J. [ININ, 52750 La Marquesa, Estado de Mexico (Mexico)]. e mail: efrp@nuclear.inin.mx

    2008-07-01

    In this work the aplication in the oil industry of the technique of radioactive tracer appears for the detection of internal leaks in a submarine duct that gives service as it lines of receipt of liquefied petroleum gas (Gas LP) located in the Mexican coast of the Pacific Ocean. This system of marine pipe is a consistent arrangement of a duct interior of 0.254 m (10 inches) of nominal diameter (N.D.) of steel to the carbon for cryogenic service ASTM A 333, Grade 6, schedule 30, isolated thermally with foam of polyurethane and shielding in a steel tube to the carbon ASTM A 53 Grade A, of 0.508 m (20 inches) N. D., schedule 20, which is recovered by a ballast encircling of concrete of 0.0508 m (2 inches) of thickness, reinforced with mesh metallic, and that 1315 m runs on the marine stratum to a maximum depth of 12.5 m. For the detection of leaks by radiotracer it was used as tracer the radioactive isotope La-140 produced in the TRIGA Mark III Experimental Reactor of the National Institute of Nuclear Research, starting from stable lanthanum nitrate (La(NO{sub 3}){sub 3} 6H{sub 2}O), with an activity of 100 mCi, the one which after having been made logistics tasks, given very particular sea maneuvers and due to the conditions of the work place, in the interior tube was injected in two subsequent stages to cover both duct senses; from earth and from the marine end respectively, there being used fresh water like transport way and submergible sodium iodide detectors (NaI) for the rake of the La-140. At the end of the journeys of pursuit of the radiotracer, it was determine the presence of three leaks points located in the break area of the marine surf to 360 m, 450 m and 495 m of distance of a reference point located in the beach section named Trap of Devils. (Author)

  13. Características regionais sobre a ultra-estrutura das células principais do epitélio do ducto epididimal de Agouti paca

    Directory of Open Access Journals (Sweden)

    Antonio Marcos Orsi

    2009-12-01

    Full Text Available As células principais (P do epitélio de revestimento do epidídimo de paca foram relacionadas com processos citofisiológicos de endocitoses do tipo adsortiva e de fase fluida, respectivamente, aparentemente realizando também secreção apócrina. Essas funções foram propostas embasando-se em características de ultra-estrutura das células P, em cujos citoplasma observaram-se um expressivo número de vesículas, com diferentes formas, tamanhos e presença de conteúdo internalizado em algumas das vesículas revestidas por endomembranas, ocorrendo ainda caveolas e vesículas diminutas localizadas junto à borda apical de microvilos. Ademais, observaram-se vesículas grandes e revestidas e/ou com superfícies lisas; endossomos, e lisossomos de localização predominantemente apical. Uma via de secreção apócrina foi sugerida com base na ocorrência de expansões (protrusões, citoplasmáticas intraluminais nas células P.

  14. Avaliação de habilidades de linguagem e pessoal-sociais pelo Teste de Denver II em instituições de educação infantil Evaluacion de habilidades de lenguaje y personal-sociales por el Test de Denver II em instituiciones de educacion infantil Evaluation of language and personal social abilities by the Denver Test II in institutions of infantile education

    Directory of Open Access Journals (Sweden)

    Magda Andrade Rezende

    2005-03-01

    jardines infantiles y pré-escolares brasileñas esa ación és poco realizada. OBJETIVO: evaluar por el segundo año consectivo, habilidades de las áreas de lenguaje y personal-social de uma cohorte de niños que frecuentan 3 jardines infantiles de la ciudad de São Paulo. METODO: el grupo estudiado fué conformado por 30 niños desde los cero hasta los cuatro años, de nivel-sócio econômico homogeneo según instrumento para evaluación de nivel de pobreza urbana. Según este instrumento todas las famílias estaban en la faja superior de clasificación. Para evaluación del desarollo fué utilizado el Test de Triage de Desarollo de Denver II, empleado en dos momentos distintos en el primer año de acompanhamiento de la cohorte y una vez en el segundo año. RESULTADOS: en el área personal-social la mejora fué significativa de la 1ª para la 2ª evaluación, lo que no ocurrió en el área de lenguaje a lo largo de las 2 evaluaciones. Por lo tanto, a partir de los 3 años de edad los niños pasaron a obtener resultados peores. En cuanto a los sexos no hubo diferencias significativas en los desempenhos de las dos áreas. CONCLUSIÓN: és possible que las habilidades de los niños en el área personal-social hayan sido incrementadas por las condiciones de las instituiciones, lo que no ocurrió en el área de lenguaje. No se puede afirmar la causa de estos acontecimientos, aunque sea intrigante la proporción adulto/niño que disminuye después de que los niños cumplen 3 años de edad, pero otras investigaciones son necesárias aun la continuidad de esta cohorte.Supervision and promotion of development are important care given to children enrolled in day-care centers and pre-schools. International and national organisms have systematized strategies to supervise child development but in Brazilian day-care centers this action is not well performed. OBJECTIVE: To assess, after a two-year follow-up, personal and social language abilities in a cohort of children enrolled in

  15. Evaluation of cable ageing in Nuclear Power Plants; Evaluacion del envejecimiento de cables en centrales nucleares

    Energy Technology Data Exchange (ETDEWEB)

    Lopez Vergara, T. [Empresarios Agrupados, A. I. E. Madrid (Spain); Alonso Chicote, J. [TECNATOM, S. A. (Spain); Burnay, S. [AEA Technology (UK)

    2000-07-01

    The majority of power, control and instrumentation cables in nuclear power plants use polymers as their basic material for insulation and jacket. In many cases, these cables form part of safety-related circuits and should therefore be capable of operating correctly under both normal and accident conditions. Since polymeric materials are degraded by the long term action of the radiation and thermal environments found in the plant, it is important to be able to establish the cable condition during the plant lifetime. Nowadays there are a number of different methods to evaluate the remaining lifetime of cables. In the case of new plants, or new cables in old plants, accelerated ageing tests and predictive models can be used to establish the behaviour of the cable materials under operating conditions. There are verified techniques and considerable experience in the definition of predictive models. This type of approach is best carried out during the commissioning stage or in the early stages of operation. In older plants, particularly where there is a wide range of cable types in use, it is more appropriate to use condition monitoring methods to establish the state of degradation of cables in-plant. Over the last 10 years there have been considerable developments in methods for condition monitoring of cables and a tool-box of practical techniques are now available. There is no single technique which is suitable for all cable materials but the range of methods covers nearly all of the types currently in use, at present, the most established methods are the indented, thermal analysis (OIT, OITP and TGA) and dielectric loss measurements, All of these are either non-destructive methods or require only micro-samples of material. (Author) 15 refs.

  16. COMPARACION DEL INDICE LECITINA/ ESFINGOMIELINA VERSUS FOSFATIDILGLICEROL EN LA EVALUACION DE LA MADUREZ PULMONAR FETAL

    OpenAIRE

    2002-01-01

    Reportamos el manejo y evolución de tres embarazos cuyo estudio de índices de madurez pulmonar en el líquido amniótico mostró lecitina/esfingomielina (L/E) inmaduro ( 2 tiene una probabilidad cercana a cero de presentar enfermedad de membrana hialina neonatal. Po...

  17. Evaluation by thermography of pediatric orthopaedic injuries; Evaluacion mediante termografia de lesions traumatologicas pediatricas

    Energy Technology Data Exchange (ETDEWEB)

    Morillo, M.; Cibrian, R.; Codoner, P.; Ballester, E.; Gonzalez-Pena, R.; Dalmases, F.; Romero, C.; Nebot, P.; Salvador, R.

    2013-07-01

    In this paper we have used thermography as a diagnostic of child trauma injury technique, seeking to turn it into an alternative to x-rays in this field. The objectives have focused on the preparation of an optimal protocol of imaging in a Pediatric Emergency Department and obtain variable quantifier of pathology. (Author)

  18. VISIÓN Y OLFATO EN LAS EVALUACIONES DE ATRACTIVO QUE HACEN HOMBRES HOMOSEXUALES

    OpenAIRE

    JOSÉ MARÍA JIMÉNEZ ORVAÑANOS; IRVIN ANTONIO CAMACHO DELGADO; ROCÍO ALCÁZAR GASPAR; JOAQUINA PALOMAR

    2013-01-01

    Las investigaciones sobre el papel de los sentidos en la elección de pareja que hacen hombres y mujeres han confirmado la presencia de procesos a nivel neurofisiológico cuya influencia va más allá de las decisiones conscientes que pudieran tomarse en cuanto a la pareja con la que deciden estar. Sin embargo, la mayoría de las investigaciones realizadas hasta ahora tienen un enfoque en parejas heterosexuales y son pocos los estudios que examinan el papel de los sentidos en la elección de pareja...

  19. Estandarizacion y evaluacion de un enzimoinmunoensayo para diagnostico y seroepidemiologia de triquinosis humana

    Directory of Open Access Journals (Sweden)

    Emílio Coltorti

    1987-12-01

    Full Text Available Se estandarizó un enzimoinmunoensayo (EIE en fase sólida en el que se empleó un antígeno soluble total de T. spiralis y una dilución única de suero, y se evaluó la capacidad del sistema para detectar anticuerpos totales antitriquina con fines diagnósticos y seroepidemiológicos. Las curvas dosis respuesta mostraron que trabajando con una dilución de suero de 1:100 se obtenía una buena diferenciación entre sueros de indivíduos no infectados y pacientes de triquinosis con baja concentración de anticuerpos circulantes y la respuesta fue lineal entre valores de 0.15 y 0.64 unidades de densidad óptica (DO. El estúdio de 720 sueros de población general no infectada revelo una X k = 0.07 y una S = 0.03 unidades de DO. El 98,61% de esta población presentó valores de DO X k + 3S y X k + 4S y < X k + 5S. Se empleó un valor de DO = X k + 5S como nivel diagnóstico para estudiar 4 brotes de triquinosis humana, 80 sueros de pacientes de triquinosis con diferentes títulos en inmunofluorescencia indirecta (IFI y 20 sueros de pacientes de hidatidosis. El EIE propuesto permitió diferenciar en forma confiable y eficiente población infectada de no infectada y tuvo una buena correlación con la IFI. Todos los sueros de pacientes hidatídicos presentaron valores de DO < X k + 4S.

  20. Procedure for the energy evaluation of electric motors; Procedimiento para la evaluacion energetica de motores electricos

    Energy Technology Data Exchange (ETDEWEB)

    Feliz Quiroz, Marco Antonio [Universidad Autonoma Metropolitana (Mexico)

    2002-06-01

    The present article is not a complete treaty about motors, here it is simply tried to show a practical procedure to evaluate electric motors, in order to determine the economics of their possible replacement by others of high efficiency. With the former in mind, the included database is sustained in the information of a representative number of motors brands commercialized in Mexico, since to include all the brands sold in our country would not be practical and it would be outside the scope of this publication. [Spanish] El presente articulo no es todo un tratado acerca de motores, sencillamente aqui se pretende mostrar un procedimiento practico para evaluar los motores electricos, a fin de determinar la rentabilidad de su eventual reemplazo por otros de alta eficiencia. Por lo anterior, la base de datos incluida se sustente en la informacion de un numero representativo de marcas de motores comercializados en Mexico, ya que abarcar todas las marcas vendidas en nuestro pais no seria practico y quedaria fuera del alcance de esta publicacion.

  1. Dose evaluation in diagnostic for computerized tomography; Evaluacion de dosis en diagnostico por tomografia computarizada

    Energy Technology Data Exchange (ETDEWEB)

    Flores, W.; Borges, J.C.; Mota, H. [Universidad Federal de Rio de Janeiro, PEN/COPPE/UFRJ. Caixa Postal 68509. 21945-970 Rio de Janeiro (Brazil)

    1998-12-31

    The patients which are subjected to computerized tomography tests are exposed to relatively high doses given as result doses on organs that are not matter to test. It was realized a dose levels raising in patients subjected to tests by T C, utilizing to measure this magnitude, TLD-100 thermoluminescent dosemeters which were put directly on the patient, in eye regions, thyroid, breast and navel; founding doses fluctuating between 29.10-49.39 mGy in organs examined and dose values between 0.21-29.10 mGy for organs that no matter to test. The applications of ionizing radiations in medicine do not have dose limits, but paying attention to the radiological protection optimization principle, it is recommended the use of clothes to anti-rays protection for zones not examined, getting with this to reduce the level doses as low as possible, without this to diminish the test quality. (Author)

  2. EVALUACION FISICA MECANICA Y QUIMICA SOBRE CERRAMIENTOS UTILIZADOS POSTERIOR A UN INCENDIO

    Directory of Open Access Journals (Sweden)

    Valero, D.

    2015-06-01

    Full Text Available Esta investigación tuvo como objetivo evaluar el comportamiento ante el calor, de bloques de concreto aligerado y de poliestireno expandido de alta densidad, usados en losas y cerramientos en edificaciones prototipo. Se enmarca dentro de una investigación de campo, de carácter experimental y analítico-descriptivo, para lo cual se realizaron seis fases: recopilación de la información, caracterización físico-mecánica del revestimiento a utilizar, prototipos o módulos a ensayar, descripción de la sistemática del ensayo, caracterización físico-química de los materiales en estudio, y elaboración de recomendaciones de seguridad en caso de incendio. Se recopiló la información necesaria en materia de poliestireno expandido de alta densidad, y bloques aligerados con arcilla expandida mediante consultas de textos, manuales, normas, institutos, locales comerciales, publicaciones en internet, personal técnico capacitado con experiencia en el uso en obras de dichos materiales. La empresa especializada International Fire Services C.A. (IFSCA realizó el estudio requerido según normas. Entre los hallazgos relevantes se encontraron los altos valores de compuestos volátiles orgánicos durante la combustión del poliestireno expandido y la propiedad de los bloques aligerados con arcilla expandida como aislantes térmicos. This research is intended to evaluate the behavior of lightened concrete blocks and expanded high density polystyrene when exposed to heat, that are used in slabs and enclosures in prototype buildings. It is part of a field research, experimental and analytical-descriptive, for which six phases were carried out: collection of information, physical-mechanical character of coating to use, prototypes or modules to be tested, description of the scheme of testing, physical-chemical character of the materials under study and development of safety recommendations in case of fire characterization. The necessary information on expanded polystyrene high density, and lightweight blocks with expanded clay was collected through consultation of texts, manuals, standards, colleges, shops, online publications, trained personnel with experience using these materials. The specialized company International Fire Services C.A. (IFSCA conducted the study required under standards. Among the key findings there were the high levels of volatile organic compounds during combustion of expanded polystyrene and characteristics of the lightweight expanded clay blocks as thermal insulators were found.

  3. Evaluacion del componente central y periferico de fatiga muscular en pacientes neuropaticos y miopaticos

    OpenAIRE

    Cohen, L.G.; Marcela E. Panizza; Olga P. Sanz; Schutz,Carlos G.; R. Rey

    1983-01-01

    Utilizando un método de cuantificación del electromiograma, se investigaron parte de los mecanismos centrales y periféricos responsables de la fatiga muscular en enfermos crónicamente denervados y en pacientes con compromiso muscular primitivo. Se observó en los denervados que los mecanismos de fatiga muscular, no difieren mayormente de los observados en el grupo de sujetos sanos, por el contrario, en los miopáticos a más del componente central, existen otros de orden periférico, tales como l...

  4. Modelo conceptual e instrumental de sostenibilidad organizacional a partir de la evaluacion del tejido social empresarial

    Directory of Open Access Journals (Sweden)

    Diana Maria Garzon R.

    2004-12-01

    Full Text Available Las organizaciones actuales enfrentan condiciones cada vez más cambiantes que les exigen capacidad de adaptarse y mantenerse en el tiempo. El presente artículo propone un modelo conceptual e instrumental de sostenibilidad, que se fundamenta en diferentes concepciones y enfoques, con los cuales se ha abordado la realidad del ser humano en las organizaciones, a partir de la introducción del concepto de tejido social empresarial. La investigación de campo se realizó en un grupo de empresas del sector biotecnológico colombiano. Se planteó una nueva perspectiva en la administración del factor humano enfocada en la sostenibilidad organizacional, y centrada en el análisis de la realidad que experimentan las personas en las organizaciones de hoy.

  5. Evaluacion del rol de variables intelectuales y socioemocionales en la resolucion de problemas en la adolescencia

    National Research Council Canada - National Science Library

    Malonda, Elisabeth; Samper, Paula; Mestre, Vicenta

    2015-01-01

    .... Han participado 532 estudiantes de 3 curso de ensenanza secundaria obligatoria, (edad media: 14.45 anos y SD= 0.763). Los ANOVA realizados muestran diferencias de genero en las variables evaluadas...

  6. Evaluacion de un conjugado antirrabico por titulacion en diferentes microscopios fluorescentes

    Directory of Open Access Journals (Sweden)

    O. P. Larghi

    1986-02-01

    Full Text Available En cinco laboratorios se tituló una partida de conjugado antirrábico para inmunofluoresCencia con microscopios de tres marcas distintas, equipados con diferentes accesorios. Los títulos obtenidos variaron entre < 1:4 y 1:64, dependiendo de los accesorios utilizados. Estos resultados ponen de relieve la necesidad de titular los conjugados en cada laboratorio. Se mencionam los inconvenientes que pueden ocasionar la distribución del reactivo diluido de acuerdo con el título obtenido por el productor, o mezclado con suspensiones de cerebro de ratones normales e infectados con virus rábico.

  7. EVALUACION DE LA CAPACIDAD ANTIOXIDANTE DE LOS COMPUESTOS AROMATICOS POLICICLICOS Y SUS DERIVADOS.

    OpenAIRE

    2004-01-01

    ¡a capacidad de los compuestos fenólicos de interactuar con radicales peroxilo es de interés tanto para entender sus procesos de oxidación como para evaluar su rol como antioxidantes en distintos sistemas. En la presente tesis se realizaron una serie de e 194p.

  8. Evaluacion de factores de resiliencia en ninos argentinos en condiciones de vulnerabilidad familiar

    National Research Council Canada - National Science Library

    Morelato, Gabriela Susana

    2014-01-01

    El presente trabajo tuvo como objetivo general identificar factores asociados a la capacidad de resiliencia en una muestra de ninos victimas de maltrato infantil y analizar la relacion entre variables...

  9. Evaluation of a direct contact heat exchanger; Evaluacion de un intercambiador de calor de contacto directo

    Energy Technology Data Exchange (ETDEWEB)

    Siqueiros, J.; Bonilla, O. [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1997-12-31

    In this paper the application areas of the direct contact heat exchangers is discussed, as well as its main characteristics. A description is made of the experimental equipment designed and built at pilot scale including the instrumentation employed. The methodology employed as well as the analysis and the discussion of the results are also presented. [Espanol] Se mencionan las areas de aplicacion de los intercambiadores de calor de contacto directo, asi como sus caracteristicas principales. Se describe el equipo experimental a nivel piloto disenado y construido incluyendo la instrumentacion utilizada. Se presenta la metodologia empleada asi como el analisis y discusion de los resultados.

  10. Evaluacion biologica del manejo de picudos y nematodos fitopatogenos en platano

    National Research Council Canada - National Science Library

    Gonzalez Cardona, Carolina; Aristizabal Hincapie, Juan Camilo; Aristizabal Loaiza, Manuel

    2009-01-01

    El trabajo se desarrollo en la granja Montelindo, municipio de Palestina (Caldas) a 5[grados] 05' N y 75[grados] 40' O, a 1010 m.s.n.m., 23.5[grados]C, precipitacion anual de 2100 mm y humedad relativa de 76...

  11. Corrosion de tendones de acero galvanizado en medios alcalinos : Evaluacion del riesgo de fragilizacion por hidrogeno

    OpenAIRE

    2007-01-01

    The hydrogen embrittelment risk in alkaline media of galvanized tendons has been insufficiently investigated. Present paper gives experimental data that contribute to clarify on this topic. Tests are carried out in alkaline media to study the process of corrosion and pasivacion of the galvanized tendon and the generation of hydrogen during the process. The variation of the mechanical properties has also been studied after the exposure of the tendon at 80% maximum load in contact with alkaline...

  12. EVALUACION DE LA NATURALEZA PRECURSORA DE MELANOMA DE LOS NEVOS MELANOCITICOS CUTANEOS

    OpenAIRE

    URIBE GONZALEZ ; PABLO FRANCISCO

    2004-01-01

    El melanoma, resultado de la transformación maligna de los melanocitos, corresponde a aproximadamente al 3% de los cánceres en los países desarrollados y su incidencia ha aumentado. Existe un número de lesiones melanocíticas claramente defin idas que incluyen una variedad de nevos comunes, nevos atípicos, melanoma in situ y melanoma invasor, presentando este último una fase de crecimiento radial y posteriormente vertical (Clark et al., 19H4). Una de las lesiones precursoras del...

  13. Gestion, evaluacion y calidad en la diversificacion de la Educacion Superior en America Latina

    Directory of Open Access Journals (Sweden)

    Sergio Martínez Romo

    2007-12-01

    Full Text Available La participación de la Sociedad Académica y sus grupos constituyentes como 'tribus' o grupos de interés en función del conocimiento (Martínez Romo, 1992, 2005 en la gestión, diseño y operación de la política pública en educación superior y la evaluación y acreditación de la calidad del posgrado y en el entrenamiento en investigación, por medio de agencias gubernamentales em México (Martínez Romo y Reséndiz, 2007 logra influir en el diseño de lãs políticas públicas y la gestión en educación superior, y aparentemente, mejores resultados al introducir explícitamente el valor conocimiento -y SUS aplicaciones- a través de los grupos o tribus -diría Becher (1989- en La gestión y los procesos de evaluación en el posgrado. Los datos obtenidos señalan que este valor parece dar a los indicadores y estándares de gestión y calidad de tipo gerencial, un sentido más trascendente que la eficacia y eficiencia esperada tradicionalmente en los modelos privado - empresariales o de servicio público en el sentido tradicional, de la noción de estado de bienestar (que en ocasiones situa la noción en términos de uso privado de bienes públicos. La investigación reportada pone en perspectiva algunas características significativas en la constitución de la Sociedad Académica en México, La distingue del Estado y de la Sociedad Civil (Martínez Romo, 1992, y caracteriza y documenta su participación en la hechura y gestión de lãs políticas para la educación superior y a través de ésta última, en la producción, promoción y difusión de la Ciencia y la Tecnología. Acciones todas ellas de contribución para el desarrollo, en un entorno de diversificación e internacionalización de la educación superior y sus instituciones.

  14. USO DEL FEEDBACK COMO ESTRATEGIA DE EVALUACION: APORTES DESDE UN ENFOQUE SOCIOCONSTRUCTIVISTA

    Directory of Open Access Journals (Sweden)

    Flor Jiménez Segura

    2015-01-01

    Full Text Available El presente documento analiza el uso del "feedback" como una estrategia de evaluación desde una perspectiva constructivista sociocultural y situada, utilizado por un grupo de docentes de la educación superior en el Practicum. Se conceptualiza el feedback como una ayuda potencial del profesorado hacia estudiantado y que se distribuye a lo largo del proceso educativo en las situaciones de evaluación que se realizan; donde la persona docente puede ayudar en el ajuste y adaptación que experimenta cada una de las personas en dicho proceso. Esta investigación sirve como insumo para las personas profesionales en Orientación que se desempeñan como docentes y que pueden utilizar el feedback como una estrategia de evaluación. Algunos de los resultados de la investigación identifican su utilización en situaciones evaluativas por parte del personal docente del Practicum en el análisis institucional, la planificación, la programación, la intervención y su respectiva evaluación, la tutoría o seminario y la defensa ante un tribunal examinador de la memoria o carpeta de aprendizaje que realiza el estudiantado.

  15. Evaluacion ambiental estrategica para cuencas prioritarias de los Andes Colombianos: dilemas, desafios y necesidades

    National Research Council Canada - National Science Library

    Guevara, Giovany

    2014-01-01

    ... y servicios ecosistemicos para el futuro. Es necesario que el gobierno colombiano formule nuevas y actualice las politicas, planes o programas, en consulta y cooperacion constante con otras instituciones, autoridades civiles y ambientales...

  16. Evaluacion de Mediciones Fisicas y de Ultrasonido para Estimaciones del Peso de la Pechuga

    Directory of Open Access Journals (Sweden)

    Melo JE

    2001-01-01

    Full Text Available El objetivo del presente trabajo fue evaluar la utilización de distintas mediciones como predictores del peso de la pechuga. En la experiencia 1 se utilizaron 32 pollos Anak y 32 pollos Ross, muestreados al azar de dos lotes de 400 animales de cada genotipo. A los 53 dias de edad se realizó la faena y una disección de cortes comerciales. Se tomaron los siguientes pesos: peso vivo (PV, de la canal (PC y de la pechuga (Pch. Se calculó para el análisis la proporción de cada uno sobre el peso vivo (%PC y %Pch. También se midieron el largo y el ancho de la pechuga con calibre. Se observaron diferencias entre genotipos para PV, PC, %PC, Pch y %Pch (p <0,05. Los animales de la línea Ross resultaron más pesados que los Anak, así coma su carcasa, pechuga y proporciones resultaron mayores. La Pch se correlacionó alta y positivamente con el PV. Ninguna de las mediciones con calibre in vivo significó un aumento de consideración en la precisión de la predicción de Pch. En la experiencia 2 se utilizaron 60 pollos INTA-Camperos, muestreados al azar de un lote de 100 animales. A los 69 días de edad se realizaron mediciones in vivo del largo y ancho de la pechuga con calibre, y de la profundidad por ultrasonido previo a la faena, midiéndose los mismos parámetros que en la anterior experiencia. La correlación entre PV y la Pch fue alta y positiva, pero media a baja con las mediciones con calibre. Se obtuvo una buena predicción de Pch (R²=0,75 a partir del peso vivo, del largo y de la profundidad de pechuga. La eliminación de la medición ecográfica no redujo el ajuste del modelo de manera significativa (R²=0,725.

  17. Formation and evaluation of artificial patinas over copper; Formacion y evaluacion de patinas artificiales sobre cobre

    Energy Technology Data Exchange (ETDEWEB)

    Rosales, B.M.; Moriena, G. [DEICOR, CITEFA, Zufriategui 4380, (1603) Villa Martelli, Argentina PAX 54 1 709-3210 Rosa Vera Universidad Catolica de Valparaiso, Inst. de Quimica, Casilla 4059, Valparaiso, Chile FAX 56 32 23-9254 (Chile)

    1998-12-31

    The unprecise characteristic of the environmental parameters determines passive variable properties in the formed corrosion products out in the open. They were required at least three years by essaying in the atmospheres where the patina is naturally formed for a long term information disposition about its protector power, its stabilization velocity and its attack morphology suffered by the metal. In patinas formed in laboratory on the contrary, to get morphology and a defined chemical composition, allowing its accelerated formation and an uniform attack, with a reproducible and controllable metal corrosion velocity. The protective properties of the patinas formed on copper as like artificial way (blue, green, violet, and maroon) as natural way out in the open which were evaluated by means of different characterization techniques. It was applied potential kinetics polarizations, scanning electron microscopy (Sem) and surface analysis EDAX. The corrosion products composition was determined by X-ray diffraction and W spectroscopy. Starting from obtained results through different techniques it was concluded that the green patinas, as artificial as the naturally formed, as well as those of the best protector power. the others three ones present different failures as less adherence, high porosity and basic metal exfoliation. (Author)

  18. Evaluacion del contenido de aminoacidos en guabina , bloch 1794, capturadas en el embalse hipereutrofico de Suata

    National Research Council Canada - National Science Library

    Acuna, Julymar; Gonzalez, Ernesto Jose; de los Angeles Alvarez, Maria; Penaherrera, Carlos; Barrero, Marinela

    2011-01-01

    ... esenciales para humanos, tales como, lisina, metionina, cisteina, treonina y triptofano [23, 29, 32]. Los productos pesqueros son particularmente buena fuente de lisina, que se encuentra en muy bajas proporciones en los cereales, el producto alimenticio mas importante en el mundo. Una reduccion en el suministro de lisina en la dieta puede conducir a p...

  19. EVALUACION DEL COMPORTAMIENTO BIOLOGICO, CLINICO Y MICROBIOLOGICO DE RESINAS DE ULTIMA GENERACION

    OpenAIRE

    Velermoro, Victor; Profesores de la Facultad de Odontología. UNMSM.; Moromi, Hilda; Profesores de la Facultad de Odontología. UNMSM.; Gálvez, Luis; Profesores de la Facultad de Odontología. UNMSM.; Salcedo, Doris; Profesores de la Facultad de Odontología. UNMSM.; Paz F., Juan José; Profesores de la Facultad de Odontología. UNMSM.; Quintana, Carmen; Profesores de la Facultad de Odontología. UNMSM.; Ayala, Gerardo; Profesores de la Facultad de Odontología. UNMSM.

    2014-01-01

    An study of three clases of resins of last generation was done evaluating the clinical conduct histological, microbiological and microfiltración through electronical microscopic concluting that the clinical answer in the three tippies of resins in casties of 3 mm of intensity were not present, in histologic grade you cannot see qualitive changes, in the microbiological aspect it was verified y kal the efect antimi crobianie is only produced with direct contact with the resens through the shap...

  20. EVALUACION COMPARATIVA DE LA CAPACIDAD DE CARGA EN CIMENTACIONES PROFUNDAS. FORMULAS ANALITICAS Y ENSAYOS DE CARGA

    National Research Council Canada - National Science Library

    ANGELA PATRICIA BARRETO MAYA; YAMILE VALENCIA GONZÁLEZ; OSCAR ECHEVERRI RAMÍREZ

    2013-01-01

    .... En este artículo se presentan los resultados obtenidos al analizar ensayos de carga con relación a cálculos de diseño sobre 10 pilotes, con el fi n de establecer cuál o cuáles de las metodologías de diseño, refl eja de manera más adecuada las condiciones geotécnicas de nuestros suelos.

  1. Evaluacion de la efectividad de manejo en reservas naturales de la sociedad civil: una propuesta metodologica

    National Research Council Canada - National Science Library

    Mayorquin, Adriana; Valenzuela, Sandra; Rangel Ch., J. Orlando

    2010-01-01

    .... Se evaluo la efectividad de manejo en reservas naturales de la sociedad civil (RNSC) y las aplicaciones piloto en dos reservas vinculadas a la Asociacion Red Colombiana de Reservas Naturales de la Sociedad Civil (Resnatur...

  2. Las evaluaciones internas del SNI: coherencias o coincidencias SNI Internal Evaluations: Coherence or Coincidences

    Directory of Open Access Journals (Sweden)

    Gerardo Reyes R.

    2012-08-01

    Full Text Available En el presente artículo se muestra la dinámica de las solicitudes recibidas por el SNI durante el periodo de 1997 a 2008. Este análisis permite profundizar en las características de este proceso de evaluación iniciado con el fin de mejorar el sistema de política científica mexicana. Se realiza un análisis del porcentaje de investigadores que optan por la evaluación, las respuestas favorables versus las desfavorables, las diferencias que se alcanzan por áreas de conocimiento, así como los indicadores promedio que deben alcanzarse para obtener la evaluación positiva en los distintos niveles del SNI. En consecuencia, se permite realizar una primera valoración sobre los Criterios Internos de Evaluación definidos por este sistema de investigación mexicano.This article shows the dynamics of the applications received by SNI during the period from 1997 to 2008. This analysis explores the characteristics of this evaluation process begun to improve the Mexican scientific policy system. It analyzes a percentage of the researchers who submit to the evaluation, the favorable and unfavorable responses, the differences achieved by areas of knowledge and the average indicators that must be achieved to obtain a positive assessment at the various SNI levels. The article constitutes an initial assessment of the Internal Evaluation Criteria defined by the Mexican research system.

  3. EVALUACION DE LA PRIMERA CRISIS FEBRIL EN 101 NIÑOS

    OpenAIRE

    Gutiérrez Contreras, Gabriela

    2012-01-01

    Las crisis febriles son una entidad clínica bien reconocida en niños. Constituyen una emergencia de observación frecuente. Son el tipo más común de ataques en la infancia, se consideran una causa que comúnmente demanda de la consulta neurológica pediátrica, no sólo por su frecuencia sino por lo dramático del cuadro y la angustiante experiencia de los padres. Se presentan del 2 al 5% de los niños entre los 6 meses y los 5 años, siendo poco frecuentes después de esta edad y con u...

  4. Evaluacion termica, mecanica y electrica de materiales compuestos cordierita-mullita

    Directory of Open Access Journals (Sweden)

    M.A. Camerucci

    2000-10-01

    Full Text Available Commercially available cordierite and mullite powders were used to obtain cordierite and cordierite-30wt% mullite materials by attrition milling, uniaxial pressing and sintering. Cordierite powders were the coarse (D50 = 1.82 mum, medium (D50 = 0.9 mum and fine (D50 = 0.45 mum single granulometric fractions and binary mixtures of them. Mullite powder employed in composites was the 7 h-attrition milled one (D50 = 1.3 mum. Hardness (H V and fracture toughness (K IC were measured by Vickers indentation techniques. Composites showed higher H V and K IC than cordierite matrices. In both materials, H V and K IC diminish with the increasing porosity. Dielectric constant (epsilon and losses (tan delta were determined at 1 MHz. An increase in epsilon and tan delta values was registered when mullite was present in composites with respect to cordierite material. Higher the porosity, epsilon was lower and tan delta increased. The thermal expansion coefficients (alpha were determined up to 1000 °C resulting the alpha of the composite close to that of the silicon.

  5. Evaluacion ambiental estrategica para cuencas prioritarias de los Andes Colombianos: dilemas, desafios y necesidades

    National Research Council Canada - National Science Library

    Guevara, Giovany

    2014-01-01

    ... (la mas poblada del pais), sufren varios impactos antropogenicos relacionados con cambios en la cobertura vegetal y el uso y manejo del suelo, que comprometen su calidad y cantidad de agua, y el suministro de otros bienes...

  6. Evaluacion de las propiedades mecanicas de poliesteramidas derivadas de los acidos tartarico y succinico

    National Research Council Canada - National Science Library

    Perez-Rodriguez, Angel T; Fernandez-Santin, Jose M; Alla, Abdellilah; Munoz-Guerra, Sebastian

    2012-01-01

    ...% de ester, obtenidas a partir de los acidos tartarico y succinico. Las mismas constituyen polimeros que presentan potencial aplicacion en el sector biomedico por su posible utilizacion en intervenciones quirurgicas para hilos de sutura...

  7. Evaluacion de preferencias hacia las mandarinas en el mercado britanico. Aplicacion de las subastas Vickrey

    OpenAIRE

    Martinez-Carrasco, Laura; Vidal, Fernando; Poole, Nigel D.

    2006-01-01

    El presente trabajo tiene como objetivo analizar las preferencias de los consumidores británicos hacia cinco variedades de mandarinas (dos de ellas españolas) en tres condiciones de información diferentes: inspección visual, pelado y cata. Se aborda por tanto el proceso de compra desde dos perspectivas: antes y después de experimentar el producto, y considerando tanto atributos de búsqueda como atributos de experiencia. Se pretende asimismo estudiar las posibilidades de mercado de las varieda...

  8. La medicion en el proceso de investigacion cientifica: Evaluacion de validez de contenido y confiabilidad

    Directory of Open Access Journals (Sweden)

    Mendoza, J.

    2009-01-01

    Full Text Available In scientific research a relevant issue is measurement. Elements that form part of the measurement process are discussed. These elements are the following: the operationalization of variables, the relationship among theory and measurement, scales as measurement instruments, the meaning of the latent variable, validity and reliability as essential properties of measurement, also including content validity. Through the understanding of these elements, the relevance of the measurement process is established. Besides, the process of content validity and the estimation of reliability of a developed scale are described.

  9. Evaluacion de las alteraciones conductuales y dopaminergicas en ratones con bajas concentraciones de plomo.

    OpenAIRE

    N. Martínez Riera; M.J. Gandur; Soria, N.; N. Riera de Martínez Villa

    2001-01-01

    La investigación de los efectos del plomo en animales de experimentación y sus consecuencias en el desarrollo neurológico conductual es compleja y controvertida. Conociendo que la maduración neurológica de los ratones ha culminado en edades que oscilan entre los 25-35 días, nuestro objetivo ha sido investigar si la administración de soluciones de diferentes concentraciones de plomo, durante tiempos establecidos de acuerdo a las dosis-ingesta, producía alteraciones en los ...

  10. EVALUACION DEL EFECTO INMUNOESTIMULANTE DE COMPUESTOS AISLADOS DE ESPECIES DEL GENERO HELIOTROPIUM EN SALMONIDOS

    OpenAIRE

    2012-01-01

    Uno de los mayores problemas en las pisciculturas durante estas últimas décadas ha sido el aumento en el número de enfermedades ocasionadas principalmente por patógenos intracelulares y que aún no cuenta con tratamientos efectivos que se traduzcan en un control adecuado. Debido a esto han surgido una serie de estrategias para controlar las enfermedades infecciosas en la acuicultura entre otras cambios en la nutrición, desarrollo de vacunas y el uso de inmunoestimulantes. A la fecha, las...

  11. Assessment and mitigation of liquefaction; Evaluacion y mitigacion de la licuefaccion

    Energy Technology Data Exchange (ETDEWEB)

    Czelada, J. A.; Melentijevic, S.

    2014-07-01

    The simplified empirical procedure in its original form presented in Youd et al (2001) and some further developments given in Idriss and Boulanger (2006) for evaluating liquefaction resistance of soils is presented in this paper only for the criteria based on standard penetration test (SPT). Methods for estimating the ground improvement techniques by stone columns and dynamics compaction are presented. For stone columns Priebe method (1995) and homogenized method (equivalent parameters) are present. for dynamic compaction methods proposed by Recomendacion Geotecnica para las Obras Maritimas y/o Porturaria - ROM 0.5-05 (2005) and Nashed et al. (2009) are described. These analysis methods for each ground improvement technique are compared in two different case histories showing similar results in each one. (Author)

  12. Evaluacion de impacto ambiental: herramienta en la formacion ambiental del arquitecto

    National Research Council Canada - National Science Library

    Alonso Gatell, Aymee; Leyva Fontes, Carmen Julia; Campos Velasquez, Erick

    2012-01-01

    ... en los campos productivos y sociales que satisfaga las necesidades basicas de la actual generacion humana, sin poner en peligro las posibilidades de las sociedades venideras. Esto requiere de voluntades, decisiones y puesta en practica de acciones politicas, economicas, cientificas y educativas [2] que se deben ver reflejadas en la responsabilidad d...

  13. Análisis de costos en evaluaciones económicas en salud: Aspectos introductorios

    OpenAIRE

    LENZ-ALCAYAGA,RONY

    2010-01-01

    El análisis de costos es parte central de la evaluación económica en salud y una preocupación de evaluadores y planificadores, a pesar de su complejidad. En este trabajo se revisan los principales términos económicos asociados al análisis de costos. La noción de costos generalizada en economía, cuyo propósito es apoyar la asignación de recursos, enfatiza en concepto de costo de oportunidad, esto es, el sacrificio en que se incurre al optar por una alternativa, el cual está dado por la alterna...

  14. Evaluacion del componente central y periferico de fatiga muscular en pacientes neuropaticos y miopaticos

    Directory of Open Access Journals (Sweden)

    L. G. Cohen

    1983-09-01

    Full Text Available Utilizando un método de cuantificación del electromiograma, se investigaron parte de los mecanismos centrales y periféricos responsables de la fatiga muscular en enfermos crónicamente denervados y en pacientes con compromiso muscular primitivo. Se observó en los denervados que los mecanismos de fatiga muscular, no difieren mayormente de los observados en el grupo de sujetos sanos, por el contrario, en los miopáticos a más del componente central, existen otros de orden periférico, tales como la pérdida de unidades motoras funcionantes durante el esfuerzo y el bloqueo temporario de la transmisión neuromuscular, que contribuye al desarrollo de la fatiga.

  15. Diferencias individuales en los perros domesticos : revision de las evaluaciones conductuales

    National Research Council Canada - National Science Library

    Jakovcevic, Adriana; Bentosela, Mariana

    2009-01-01

    .... En el trabajo que se informa se presenta una revision de estudios sobre diferencias individuales en perros, basada unicamente en las baterias conductuales que evaluan un conjunto de rasgos del temperamento...

  16. Evaluacion no lineal de dos postes diferentes.(poste colado, poste prefabricado)

    National Research Council Canada - National Science Library

    Villaraga Ossa, Junes Abdul; Lopera Builes, Patricia; Latorre Correa, Federico

    2012-01-01

    Introduccion: los dientes tratados endodoncicamente que van a ser rehabilitados con coronas y que han perdido parte de su estructura dental, necesitan de un poste prefabricado o colado para que ayude...

  17. Los portafolios : Hacia una evaluacion mas integrada y coherente con el concepto de desempeno complejo

    OpenAIRE

    Poumay, Marianne; Maillart, Christelle

    2015-01-01

    Le présent chapitre prend résolument le parti du témoignage et construit sur l’expérience des auteures. Il choisit quelques référents théoriques, qu’il illustre ensuite par deux expériences ciblées, l’une chez les étudiants en logopédie/orthophonie et l’autre chez les étudiants en pédagogie de l’enseignement supérieur, deux programmes de l’Université de Liège. Il conclut sur quelques réflexions et perspectives.

  18. El portafolio como estrategia de evaluacion en carreras de posgrado inter y transdisciplinariasi

    National Research Council Canada - National Science Library

    Fracapani, Marta; Fazio, Marisa

    2008-01-01

    Resumen: La Maestria en Bioetica de la Universidad Nacional de Cuyo reune profesionales de ciencias sociales y humanas y de ciencias duras, y acentua especialmente la formacion de actitudes como la tolerancia...

  19. Evaluacion del potencial biofertilizante de bacterias diazotrofas aisladas del cultivo de cacao (Theobroma cacao L.)

    National Research Council Canada - National Science Library

    Adriana Zulay Argüello-Navarro; Laura Yolima Moreno-Rozo

    2014-01-01

      The adaptability of cacao (Theobroma cacao L.) to adverse conditions, suggests that the microbiota associated with the rhizosphere of this plant could play an important nutrition and development function...

  20. La evaluacion de impacto ambiental. Nuevas Tecnicas disponibles y dificultades de aplicacion

    National Research Council Canada - National Science Library

    Abad Soria, Jesus; Charytonowicz, Joanna; Pacholczyk, Monika

    2008-01-01

    Desde los primeros estudios de impacto ambiental a los que en la actualidad se realizan se han producido cambios, siendo uno de los mas importantes el de disponer de un mayor volumen de informacion...

  1. Guia Practica para una Evaluacion Alternativa (Practical Guide to Alternative Assessment).

    Science.gov (United States)

    Herman, Joan L.; Aschbacher, Pamela R.; Winters, Lynn

    Guidance is offered in Spanish on the creation and use of alternative assessment, and a process model is presented that links assessment with curriculum and instruction, based on contemporary theories of learning and cognition. The introductory chapter provides background on the purposes of assessment and the need for new alternatives, with an…

  2. Evaluacion de las alteraciones conductuales y dopaminergicas en ratones con bajas concentraciones de plomo.

    Directory of Open Access Journals (Sweden)

    N. Martínez Riera

    2001-01-01

    Full Text Available La investigación de los efectos del plomo en animales de experimentación y sus consecuencias en el desarrollo neurológico conductual es compleja y controvertida. Conociendo que la maduración neurológica de los ratones ha culminado en edades que oscilan entre los 25-35 días, nuestro objetivo ha sido investigar si la administración de soluciones de diferentes concentraciones de plomo, durante tiempos establecidos de acuerdo a las dosis-ingesta, producía alteraciones en los juegos solitarios en animales de experimentación adultos. Se trabajó con ratones adultos de ambos sexos de la cepa C3H, alimentados con dieta estándar y agua ad libitum. Se utilizaron seis lotes: tres experimentales que fueron tratados con acetato de plomo en el agua de bebida en diferentes concentraciones: 1, 1000 y 2000 ppm y en los tres grupos controles, la ingesta fue de agua potable. En este trabajo se estudiaron los juegos solitarios de los animales: 1 Actividad locomotora, 2 Aseo total, 3 Exploración subterránea (en tiempo y frecuencia y 4 Exploración aérea total. Se determinó el nivel de dopamina presente en el cerebro de los mismos por espectrofluorometría. Los resultados obtenidos de las alteraciones conductuales en los animales de experimentación analizados con tests no paramétricos fueron: disminución significativa de la actividad locomotora (número de cuadros, de la exploración subterránea (en tiempo, de la exploración aérea (en tiempo y del aseo total, no observándose variaciones significativas en la exploración subterránea (en frecuencia. Las variables investigadas estarían mediadas por distintos sistemas de neurotrasmisión. En la dopamina determinada en cerebro de ratones con ingesta de plomo de 1 - 1000 - 2000 ppm se encontró disminución significativa de la misma en los ratones tratados con respecto a los grupos controles.

  3. La Evaluacion del Desarrollo de los Alumnos Preescolares (Assessing the Development of Preschoolers). ERIC Digest.

    Science.gov (United States)

    Katz, Lilian G.

    To help parents address those aspects of their child's development which may need special encouragement, support, or intervention, this digest delineates 11 categories of behavior for assessment. Parents should not be alarmed if their children are having difficulty in only a few categories, and they should not judge their children's permanent…

  4. AVANCES EN LA EVALUACION DE LA ACTIVIDAD ANTIOXIDANTE DE DIEZ ESPECIES DE LA FAMILIA STERCULIACEAE

    Directory of Open Access Journals (Sweden)

    Victor Sotero

    2012-12-01

    Full Text Available En el trabajo, se presentan los resultados de evaluación de la actividad antioxidante de diez especies de la familia Sterculiaceae, y que comprende en algunos casos a la corteza, raíz y hojas. La determinación de la actividad antioxidante se realizó mediante secuestro de radicales libres del DPPH a 250000 μg/ml  y 3000 μg/ml. Los resultados indican que las mejores actividades en cortezas fueron T. obovatum con y T. subincanum, alcanzando 37,34 y 22,9% de inhibición, en hojas: H. swietenoides con 17,5%  de inhibición, en raíces  T. subincanum y T. obovatum con 68,3% y 13,81% de inhibición. Se pude deducir que en términos generales los compuestos fenólicos participan activamente en la actividad antioxidante. En cuanto a la concentración de polifenoles en cortezas, las mejores concentraciones la presentan H. swietenoides (43,72%,  T. obovatum (37,88 μg/g, T.subincanum (19,89 μg/g y T. speciosum (19,78 μg/g. En cuanto a la concentración de polifenoles en hojas se observa que H. swietenoides, S. frondosa, T.subincanum y T. speciosum, presentan concentraciones  entre 14,08 y 66-05 μg/g. La concentración de polifenoles en hojas para  T.subincanum,  S. frondosa, S. apeibophylia y T.obovatum, varió entre 10,80 a 59,92 μg/g.

  5. MODELO PARA EVALUACION DE DERRAMES DE HIDROCARBUROS (HSSM) GUIA DEL USUARIO

    Science.gov (United States)

    The U.S. Environmental Protection Agency is charged by Congress with protecting the Nation's land, air, and water resources. Under a mandate of national environmental laws, the Agency strives to formulate and implement actions leading to a compatible balance between human acti...

  6. CRECIMIENTO Y DISTRIBUCION: UNA EVALUACION DE LA HIPÓTESIS DE KUZNETS

    Directory of Open Access Journals (Sweden)

    Lina Ochoa C

    2003-06-01

    Full Text Available Durante muchos años la hipótesis de Kuznets ha sido el paradigma para el estudio de la dinámica distributiva de largo plazo. No obstante, la experiencia de muchos países en décadas recientes sugiere que la visión de Kuznets debe reevaluarse. Este trabajo intenta presentar algunos elementos teóricos que se han introducido en la bibliografía sobre este tema, así como otros que no han sido muy estudiados pero que igualmente son pertinentes para mejorar el análisis de este problema. De esta forma se puede entender que el escenario distributivo analizado por Kuznets es solo uno entre muchos posibles.

  7. AVANCES EN LA EVALUACION DE LA ACTIVIDAD ANTIOXIDANTE DE DIEZ ESPECIES DE LA FAMILIA STERCULIACEAE

    Directory of Open Access Journals (Sweden)

    Victor Sotero

    2012-12-01

    Full Text Available En el trabajo, se presentan los resultados de evaluación de la actividad antioxidante de diez especies de la familia Sterculiaceae, y que comprende en algunos casos a la corteza, raíz y hojas. La determinación de la actividad antioxidante se realizó mediante secuestro de radicales libres del DPPH a 250000 μg/ml y 3000 μg/ml. Los resultados indican que las mejores actividades en cortezas fueron T. obovatum con y T. subincanum, alcanzando 37,34 y 22,9% de inhibición, en hojas: H. swietenoides con 17,5% de inhibición, en raíces T. subincanum y T. obovatum con 68,3% y 13,81% de inhibición. Se pude deducir que en términos generales los compuestos fenólicos participan activamente en la actividad antioxidante. En cuanto a la concentración de polifenoles en cortezas, las mejores concentraciones la presentan H. swietenoides (43,72%, T. obovatum (37,88 μg/g, T.subincanum (19,89 μg/g y T. speciosum (19,78 μg/g. En cuanto a la concentración de polifenoles en hojas se observa que H. swietenoides, S. frondosa, T.subincanum y T. speciosum, presentan concentraciones  entre 14,08 y 66-05 μg/g. La concentración de polifenoles en hojas para T.subincanum,  S. frondosa, S. apeibophylia y T.obovatum, varió entre 10,80 a 59,92 μg/g.

  8. Evaluacion de la calidad del agua del rio Opia mediante macroinvertebrados acuaticos y parametros fisicoquimicos

    National Research Council Canada - National Science Library

    Forero-Cespedes, Adriana Marcela; Reinoso-Florez, Gladys; Gutierrez, Carolina

    2013-01-01

    Durante los meses de septiembre y octubre de 2009, se realizo una caracterizacion biologica y fisicoquimica de la cuenca del rio Opia, con el fin de estimar la calidad del agua a traves de la fauna...

  9. MODELO PARA EVALUACION DE DERRAMES DE HIDROCARBUROS (HSSM) GUIA DEL USUARIO

    Science.gov (United States)

    The U.S. Environmental Protection Agency is charged by Congress with protecting the Nation's land, air, and water resources. Under a mandate of national environmental laws, the Agency strives to formulate and implement actions leading to a compatible balance between human acti...

  10. Evaluacion de la sostenibilidad de la agricultura de subsistencia en San Jose de Cusmapa, Nicaragua

    OpenAIRE

    Prieto, Esperanza; Gonzalez, Omar; Zazo, Alicia; Diaz-Ambrona, Carlos G.

    2013-01-01

    Evaluar la sostenibilidad de los sistemas agricolas campesinos representa un reto a nivel global ya que la agricultura familiar produce mas del 70% de los alimentos del planeta. En Nicaragua, el 49% de la poblacion rural practica agricultura familiar, siendo el 38% de subsistencia. La zona de estudio se situo en 11 comunidades del municipio de San Jose de Cusmapa (departamento de Madriz, Nicaragua) donde se realizaron 80 encuestas semiestructuradas. Se analizaron los indicadores de: rendimien...

  11. Evaluacion de un conjugado antirrabico por titulacion en diferentes microscopios fluorescentes

    OpenAIRE

    1986-01-01

    En cinco laboratorios se tituló una partida de conjugado antirrábico para inmunofluoresCencia con microscopios de tres marcas distintas, equipados con diferentes accesorios. Los títulos obtenidos variaron entre < 1:4 y 1:64, dependiendo de los accesorios utilizados. Estos resultados ponen de relieve la necesidad de titular los conjugados en cada laboratorio. Se mencionam los inconvenientes que pueden ocasionar la distribución del reactivo diluido de acuerdo con el título obtenido por el produ...

  12. Recomendaciones para el mejoramiento de procesos a partir de evaluaciones basadas en COMPETISOFT

    OpenAIRE

    2008-01-01

    En el contexto del desarrollo de software por pequeñas y medianas empresas en Iberoamérica y las dificultades de intentar aplicar estándares internacionales de calidad, se analizan los modelos que han surgido en distintos países para la aplicación en PyMEs, en particular el modelo CompetiSoft en su versión Perfil Básico y se presenta una propuesta para la evaluación del cuestionario del proceso "administración de proyectos específicos" y la aplicación de la misma en una PyME de la ciudad de L...

  13. Evaluacion de la memoria auditiva y visual en niños hiperactivos

    Directory of Open Access Journals (Sweden)

    Mirta Susana Ison

    2001-01-01

    Full Text Available Los objetivos del presente trabajo son: 1 explorar la memoria auditiva y visual en niños con y sin comportamiento hiperactivo y 2 analizar la habilidad para la integración intra e intersensorial en ambos grupos de niños. Los sujetos examinados fueron 78 niños entre 7 y 9 años de edad, de ambos sexos: 42 varones y 36 niñas, de nivel socioeconómico bajo. Todos los niños concurrían a escuelas urbanomarginales de la Provincia de Mendoza (Argentina. Se dividió a la muestra total de niños en dos subgrupos: con conducta hiperactiva (n = 39 23 varones y 16 mujeres y 2 sin conductas hiperactiva (n = 39 19 varones y 20 mujeres. Los resultados obtenidos revelan que: 1 Los niños con conducta hiperactiva en comparación con aquellos que no la presentaron, obtuvieron puntuaciones significativamente menores en la capacidad para evocar una secuencia de estímulos, tanto auditivos como visuales. 2 Al explorar la Integración intrasensorial, Integración intersensorial, Expresión Oral y Expresión Escrita, los niños con conducta hiperactiva en comparación con aquellos que no la presentaron, obtuvieron puntuaciones significativamente menores. 3 En el subtest de Dígitos del WISC III (Wechsler, 1997 los niños con conducta hiperactiva presentaron puntajes menores con respecto a los niños sin este trastorno. En el subtest Aritmética no se observaron diferencias significativas entre ambos grupos. Los resultados obtenidos en este trabajo muestran que los niños con conducta hiperactiva exhiben un rendimiento más bajo en las funciones cognltlvas - conductuales evaluadas: Memoria auditiva - visual de dígitos e integración intra e intersensorial. Ambas pruebas están ligadas a la capacidad de secuenciación y de concentración en tareas sencillas. Este trabajo sugiere la implementación en el ámbito escolar de programas de entrenamiento para desarrollar estrategias cognitivas conductuales, tendientes a atenuar las conductas desorganizadas e impulsivas, mejorando la ejecución y el rendimiento en las diferentes tareas.

  14. Evaluacion ciudadana del desempeño de la Gestion Publica Municipal

    Directory of Open Access Journals (Sweden)

    Graciela Delgadillo

    2010-01-01

    Full Text Available This article presents the result of a study whit the objective to identify and measure the impact of the factors that the citizens uses to evaluate the public management performance in a specific territorial and temporary space in the sphere of action of local government. With a sample of 250 Mexican citizens that normally live in Guadalupe, Nuevo Leon, Mexico conformed by 126 (50,4% women of between 23 and 73 years with a mean of 43 years old and 124 (49,6% men of between 18 and 71 years with a mean of 38 years old, the most important findings allowed to identify the factors that mainly influence the evaluation that the citizen does about the local government performance are: the effectiveness of the public services, the honesty of the public workers and the accountability just only linked to the access of public information. The study also offers evidence that confirm variation does not exist between men and women in their way of local government performance evaluation.

  15. Patterns of probabilistic evaluation of the maintenance; Patrones de Evaluacion Probabilista del Mantenimiento

    Energy Technology Data Exchange (ETDEWEB)

    Torres V, A.; Rivero O, J.J. [Dpto. Ingenieria Nuclear, Instituto Superior de Tecnologias y Ciencias Aplicadas, Ave. Salvador Allende y Luaces, Quinta de los Molinos, Plaza, Ciudad Habana (Cuba)]. e-mail: atorres@fctn.isctn.edu.cu

    2004-07-01

    The Boolean equation represented by the minimum sets of court at level of a system or of all one Probabilistic safety analysis (APS) it has been used for to evaluate the output configurations of service of teams during the exploitation. It has been carried out through applications of APS for the optimization of operational regimes. The obtaining of such boolean equations as demands of a process of high mathematical complexity for what exhaustive studies are required, even for the application of their results. The important advantages for the maintenance that they obtain of these applications they require the development of methodologies that bring near these optimization methods to the systems of management of the maintenance, and not facilitate their use for a personnel specialized in the probabilistic topics. The article presents a methodology for the preparation, solution and utilization of the results of the fault tree leaving of technological outlines. This algorithm has been automated through the MOSEG code Win to Ver 1.0 (Author)

  16. Un metodo estable para la evaluacion de la complejidad algoritmica de cadenas cortas

    CERN Document Server

    Zenil, Hector

    2011-01-01

    It is discussed and surveyed a numerical method proposed before, that alternative to the usual compression method, provides an approximation to the algorithmic (Kolmogorov) complexity, particularly useful for short strings for which compression methods simply fail. The method shows to be stable enough and useful to conceive and compare patterns in an algorithmic models. (article in Spanish)

  17. Las opciones reales como metodologia alternativa en la evaluacion de proyectos de inversion

    National Research Council Canada - National Science Library

    Tamara Ayus, Armando Lenin; Aristizabal Velasquez, Raul Enrique

    2012-01-01

    Este trabajo busca ampliar la aplicabilidad de la metodologia de valoracion de proyectos de inversion por medio de opciones reales como un elemento fundamental al momento de tomar una decision de si...

  18. Evaluations of Molecular Nuclear Medicine in pediatric urgencies; Evaluaciones de Medicina Nuclear Molecular en urgencias pediatricas

    Energy Technology Data Exchange (ETDEWEB)

    Martinez-Duncker R, C. [Departamento de Medicina Nuclear Molecular, Hospital Infantil de Mexico, Mexico D.F. (Mexico)

    2000-07-01

    Several diagnostic procedures of Molecular Nuclear Medicine are considered in first choice in clinical evaluation of patients with different illnesses. So, the gammagraphy is the diagnostic form more sensitive to detect alterations of the perfusion on organs and systems such as bones, heart, brain, lungs or kidneys. Also is possible to identify, localize, evaluate the activity of inflammatory processes such as cellulitis, arthritis, osteomyelitis, the abscesses and several primary or metastatic tumours before each other diagnostic technique. In this work is treated about the importance of treatments with radioactive materials have been an important reappearance in last years since with the present capacity to localize specifically intracellular processes (for example, synthesis of DNA) new gateways are opened to research which in coming years would be of great utility. (Author)

  19. Voltage stability evaluation of the Paraguayan system; Evaluacion de la estabilidad de tension del sistema paraguayo

    Energy Technology Data Exchange (ETDEWEB)

    Cardozo Sanchez, Freddy [Mirant Americas (United States); Fernandez Krekeler, Ubaldo [Administracion Nacional de Electricidad (ANDE), Asuncion (Paraguay)

    2001-07-01

    This document presents analyses of permanent status of the ANDE transmission system, seeking to evaluate the voltage stability and impact that would have possible reinforcements in 500 kV. The transmission under this new voltage level, besides to be a reinforcement to the system for satisfying the national demand, will permit the increase of energy exportation to Brazil, depending on the adopted reinforcement. The system current status and its evolution according to the planning of short and medium period are analysed. In the voltage stability evolution, static analysis techniques to draw the Q-V and P-V curves were used, as well as for determination of the system self-values and stability margins.

  20. Evaluation of seismic input for nuclear power plants; Evaluacion del input sismico para plantas nucleares

    Energy Technology Data Exchange (ETDEWEB)

    Saragoni, G. R.

    2012-07-01

    The accident that affected the Fukushima Daiichi nuclear power plant on March 11th 2011 was the result of the Tohoku earthquake (Japan), the fifth largest ever registered in the world. The characteristics of the event will be a subject for study by the nuclear and seismology communities for many years to come. (Author)

  1. Bilateral type emphysematous pyelonephritis: imaging evaluation; Pielonefritis enfisematosa bilateral tipo I. Evaluacion por la imagen

    Energy Technology Data Exchange (ETDEWEB)

    Salvador Cueto-Alvarez, L.; Piriz-Campos, E.; Ruiz-Garcia, T.; Roldan-Lora, F. [Hospital Universitario Virgen Macarena. Sevilla (Spain)

    2000-07-01

    Emphysematous pyelonephritis (EPN) is a serious infectious disease that occurs more frequently in diabetic patients. Radiological studies are indispensable for distinguishing between the two types since each is associated with a markedly different prognosis. We present a case of bilateral EPN diagnosed as type I on the basis of computed tomography findings, differentiating it from type II EPN, taking into account the prognostic value of this distinction. Type I EPN is characterized by the destruction of the renal parenchyma, a mottled or linear gas pattern and the absence of renal and perirenal fluid collection. Type II EPN is characterized by a loculated or bubbly gas pattern, the existence of fluid collection and less marked renal destruction. Type I is more aggressive and is associated with high rate of mortality. (Author) 7 refs.

  2. Estudos anatômicos e histológicos sôbre a subfamília Triatominae (Heteroptera, Reduviidae: VII. Estudo anatômico do ducto intestinal do Triatoma infestans

    Directory of Open Access Journals (Sweden)

    Dyrce Lacombe

    1957-05-01

    Full Text Available Devido à imprtãncia que certos Triatomíneos hematófagos representam na vida humana, continuarmos a série de estudos já iniciados em nosso laboratório sôbre seus organismos. É feito, no presente trabalho, a anatomia e microanatomai do aparelho digestivo de Triatoma infestans. Das três distintas regiões do duto intestinal estomodeo, mesêntero e proctodeo, a primeira e a terceira são de origem ectodérmica. A região do estomodeo é constituída pela faringe e esôfago; a do proctodeo pelo piloro, íleo e reto. A segunda, de origem endodérmica, consta promesêntero, postmesêntero e da zona de transição. A anatomia e a microanatomia do faringe já foi estudada minuciosamente por BARTH (1952. O esôfago possui numerosas dobras no seu interior revestida de fina cutícula. A musculatura longitudinal e circular acham-se representadas por feixes que, provàvelmente, trabalham, preistàlticamente, transportando o alimento. Não encontramos um proventrículo, de maneira que o esôfago está ligado diretamente à primeira parte endodérmica, isto é, ao promesêntero. No início do promesêntero existe a válvula cardíaca, que, juntamente com as dobras do fim do esôfago, impedem que haja um refluxo do alimento. Durante a alimentação, a parede do preomesêntero, que apresenta numerosas dobras, sofre uma dilatação, a fim de reter u'a maior quantidade de sangue. Entre promesêntero e postmesêntero há um pequeno esfíncter formado pelo aumento da musculatura e das dobras do epitélio. O postmesêntero alcança cinco vêzes mais que o tamanho total do corpo do inseto, e dispõe no abdome em curvas completas, que, muitas vêzes, se superpõem. O seu epitélio possue célula altas e estreitas, e forma muitas dobras para dentro do seu lume. Na parte apical as células possuem um rabdório. O postmesêntero termina após a válvula cardíaca situada atrás do desembocamento das quatro ampolas dos tubos de Malpighi. Entre postmesêntero e proctodeo está situada a zona de transição, que é constituída pelas ampolas dos tubos de Malpighi, válcula pilórica e zona clara de células cubóides. Os quatro tubos de Malpighi são longos, finos e simples formando emaranhados. As ampolas são dilatações das bases dos tubos de Malpighi. Apresentam sempre células características. A formação da válvula pilórica pode ser acompanhada na série de cortes de 27-44. O piloro é revestido, internamente, por fina cutícula, e sua hipoderme é sinsicial. No íleo temos dobras mais elevadas e maior quantidade de musculatura. O reto acha-se deslocado para a região dorsal do corpo devido ao aumento exagerado do aparelho copulador. As células de sua hipoderme são bem limitadas.

  3. Investigación sobre técnicas avanzadas e instrumentación electroquímica y gravimétrica para evaluar el control de la corrosión en ductos de hidrocarburos /

    OpenAIRE

    Cáceres Jiménez, Andrea de los Ángeles

    2011-01-01

     tesis que para obtener el grado de Doctor en Ingeniería Química, presenta Andrea de los Ángeles Cáceres Jiménez ; asesor Lorenzo Martínez Gómez. XV, viii, 175 páginas : ilustraciones. Doctorado en Ingeniería Química UNAM, Facultad de Química, 2011

  4. Diseño e implementación de un sistema de adquisición y monitoreo de datos (shm para un rectificador de protección catódica usado en ductos.

    Directory of Open Access Journals (Sweden)

    Daniel Alejandro Rodríguez-Caro

    2016-01-01

    Full Text Available Background:Cathodic protection by impressed current is one of the methods to prevent corrosion of pipes or tanks, preserving the structural state and integrity of the material. For a cathodic protection system to function properly there must to be a control over the electrical variables involved in the process, which is why it is necessary to monitor variables such as (voltage, current and potential protection. Objective: to develop a system of data acquisition and monitoring in real time, in order to increase accessibility to electrical variables and thus improve the operation of the cathodic protection system. Methods: The monitoring and information analysis system is based on the concept of SHM (Structural Health Monitoring, which consists of an electronic system for remote acquisition and sending of signals (micro controller and GSM communications system and a system for visualization and analysis of information in a mobile system (cell using a web server for it. Given that the condition of structural integrity of the pipeline is determined by the correct operation of the rectifier. Results: It was possible to implement a monitoring and remote viewing system of the main variables of a cathodic protection system. An algorithm based on the concept of SHM was developed, allowing to correlate, generate trend and establish performance criteria for the cathodic protection system which allows to establish whether the system is ensuring the structural integrity of the crude transportation pipeline. Conclusion: the novelty of this work is to show the real-time behavior of the variables needed to analyze whether the pipeline is being properly protected and generate alarms and reports regarding cathodic protection, which is based on the concept of SHM (Structural Health Monitoring.

  5. Consideraciones de las propiedades mecánicas y térmicas para la elaboración de un ducto de riego a partir de materiales poliméricos postconsumo

    OpenAIRE

    Mary Luz Barrios-Hernández

    2014-01-01

    En este artículo se presentan los resultados obtenidos al desarrollar tres nuevas formulaciones a partir de materiales poliméricos generados en el desecho doméstico, con el fin de determinar el mejor material para fabricar poliducto de riego en Costa Rica, utilizando poliducto comercial como referencia. Se recuperó material polimérico postconsumo, específicamente polietilenos y polipropilenos, con la ayuda de actores de programas de recuperación de desechos del Tecnológico de Costa Rica. El m...

  6. Introduccion a la Evaluacion: Una introduccion practica a la evaluacion en proyectos para la ninez de temprana edad (Introducing Evaluation: A Practical Introduction to Evaluation in Early Childhood Projects).

    Science.gov (United States)

    Eyken, Willem van der

    Developed for the staff of field projects, this booklet provides guidelines for evaluating projects to promote activities that will enhance the well-being of young children, their families, and their communities. The booklet aims to stimulate ideas and discussions, offers general principles to help in evaluation, and raises issues that encourage…

  7. Exegetic evaluation of solar heating water thermosyphonic; Evaluacion exergetica de sistemas de calentamiento de agua solares termosifonicos

    Energy Technology Data Exchange (ETDEWEB)

    Barral, J. R.; Andreani, R. J. L.; Lucchini, J. M.; Fasulo, A. J.

    2004-07-01

    A tool has been developed in order to analyse by means of the exegetic method the behaviour of a solar water heating thermosyphonic system composed by a flat plate collector and a tank, aided by a auxiliary conventional heater. A computational model run annual simulations, using data obtained from normalized test for commercial flat plate collectors. Taking into account the hot water demand and the climatic conditions, it is possible to determine the critical points of exergy destruction from de project design and the assembly of the system components, integrating the values for one typical year. Therefore, different combinations collector-tank can be tested in order to select the necessary auxiliary heater, looking for an economic optimized system. (Author)

  8. Evaluacion de una formulacion quimica para eliminar danos de la formacion, por precipitacion de escamas de carbonato de calcio

    National Research Council Canada - National Science Library

    Gonzalez-Nunez, Freya; Ramirez-Pereda, Blenda; Echevarria Pestana, Felix

    2012-01-01

    La aplicacion de la innovadora quimica en los tratamientos de acidificacion de la matriz, restablece la productividad en muchas formaciones danadas de un modo eficaz desde el punto de vista de sus costos...

  9. Evaluation of adjustment functions in a heuristic algorithm; Evaluacion de funciones de ajuste en un algoritmo heuristico

    Energy Technology Data Exchange (ETDEWEB)

    Perusquia del Cueto, R.; Montes T, J. L.; Ortiz S, J. J.; Castillo M, A., E-mail: raul.perusquia@inin.gob.mx [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico)

    2011-11-15

    At present the techniques of evolution al computation receive an increasing attention in the scientific and technological areas. This situation is due to its enormous potential in the optimization applied to problems of discussed computational complexity. In the nuclear area these techniques are used in diverse problems of combinatory optimization related with designing cores of power reactors. A distinctive characteristic of the evolution al and/or meta-heuristic algorithms is that appeal in each one from their applications to an adjustment function, fitness or of quality. This function allows to discriminate or to evaluate potentials solutions of the problem to solve. The definition of this situation is very important since it allows following the search of the algorithm toward different regions of the search space. In this work the impact that has the election of this function in the quality of the found solution is shown. The optimization technique by ant colonies or Acs (ant colony system) was used applied to the radial design of fuel cells for a boiling water power reactor. The notable results of the Acs allowed to propose the adjustment method of the importance and with this to obtain adjustment functions that guide the search of solutions of collective algorithms efficiently, basic capacity to develop the proposal of emulation of the natural selection and to investigate the possibility that on order of specify goals, to obtain the corresponding decision variables. A variety of re tro-exit (re tro-out) complementary process of feedback (re tro-in) that opens extended application perspectives of be feasible. (Author)

  10. Evaluacion ex vivo de la retencion de estructuras en zirconia--ytria de procera[R] con diferentes cementos

    National Research Council Canada - National Science Library

    Mejia Bravo, Richard Milton; Catarroso Perez, Carlos Bernardo; Ruiz Restrepo, Xiomara Cristina; Espitia Mesa, Jose Fernando; Moreno Castillo, Jenny Alexandra; Montoya Sepulveda, Andres Felipe

    2014-01-01

    Introduccion: en tanto no se encuentra en la literatura un protocolo fundamentado de cementacion para restauraciones elaboradas en zirconia-ytria, el proposito de este estudio fue evaluar ex vivo la retencion...

  11. INHIBICION DE LA EXPRESION DEL GEN DE LA DESHIDROGENASA ALDEHIDICA: EVALUACION DEL SISTEMA DE RNA DE INTERFERENCIA

    OpenAIRE

    CORTINEZ FLORES, GABRIEL

    2008-01-01

    El alcoholismo es una enfermedad multifactorial que genera una serie de trastornos personales, sociales y de salud pública. Según estimaciones del Ministerio de Salud de Chile el abuso en el consumo de alcohol y el alcoholismo causa pérdidas al país por US$3.000 millones anuales. Luego de la oxidación hepática del etanol, el acetaldehído generado es metabolizado a acetato por la deshidrogenasa aldehídica 2 (ALDH2*1). En la población Asiática existen individuos que poseen una variante de la...

  12. The evaluation of Spanish environmental impact. Costs and limitations; La evaluacion de impacto ambiental en Espana. Coste y limitaciones

    Energy Technology Data Exchange (ETDEWEB)

    Canto, S.; Riera, P.; Borrego, A.

    2009-07-01

    The environmental impact assessment applies to new investments in public infrastructure and in industrial activities. The latter accounts for most of the environmental impact studies undertaken in Spain. This evaluation tool has a number of limitations and weaknesses, both in the analysis and its implementation. This article discusses some of these limitations, including the private cost of the process. (Author) 14 refs.

  13. Evaluation of the indexes of income yield capacity of energetic projects; Evaluacion de los indices de rentabilidad de proyectos energeticos

    Energy Technology Data Exchange (ETDEWEB)

    Villanueva M, C. [Facultad de Quimica, UNAM, 04510 Mexico D.F. (Mexico)

    2008-07-01

    An economic-financial model to evaluate in the class living room those indexes of profitability of projects of productive infrastructure of the energy sector was developed, as for example: generation projects, transmission and electric energy distribution; projects of transport and distribution of natural gas; projects of cogeneration of vapor and electricity; projects of refinement of petroleum; and other industrial projects. It is described the structure and operation of the pattern, which has been implemented in an Excel calculation sheet that the students use in their personal computers to apply it to the evaluation of the indexes of profitability, specified by the Secretaria de Hacienda y Credito Publico (SHCP) in their limits for the elaboration and presentation of the cost and benefit analysis of the programs and projects of investment of the public sector. The indicators are: present net value VPN, quotient benefits cost B/C, return internal rate TIR, and equivalent annual cost CAE, which should be calculated with methodological rigor according to the SHCP lineaments. The pattern uses the pre-programmed financial functions in the Excel calculation sheet to carry out the compute of the indicators starting from the effective flow of the projects. It is described the technician-economic configuration and the effective flows during the useful life of three power stations of electric power generation that are designed, builds and operated to sell electric power to the national interconnected system in a nodal marginal prices market: a hydroelectric one, a combined cycle power station that uses natural gas, and a nucleo electric. The effective flows are developed and the central profitability of three centrals are evaluated and they are also carried out the corresponding sensitivity analyses and indifference required by the SHCP in their lineaments. Finally, the conditions in that the projects should operate and the prices in those that should sell their production to the national interconnected system so that they are profitable are discussed. (Author)

  14. Evaluation of glass leaching as nutrient source for microalgae growth; Evaluacion del comportamiento de vidrios lixiviados como nutrientes de algas

    Energy Technology Data Exchange (ETDEWEB)

    Grabska, N.; Tamayo, A.; Mazo, M. A.; Pascual, L.; Rubio, J.

    2015-10-01

    Three glasses with an elemental composition similar to the nutrient ratio required for Spirulina platensis growth and with different SiO{sub 2} content have been prepared. The glasses were crushed and sieved into 2 different fractions and the effect of the particle size has been studied in terms of the leaching kinetics of each element. The chemical analysis of the leaching water was used for obtaining the dissolution rate curves for each element taking part of the glass composition. From the calculation of the leaching rate constant and the exponential constant of the lixiviation reaction, it has been evaluated the Spirulina platensis growth in ambient normal conditions of light, temperature and pH of the growing media. It has been concluded that, either from the modification of the chemical composition of the glass or its particle size, it is possible to tune the delivery of the nutrients to match the growth rate of Spirulina platensis. (Author)

  15. Solar photovoltaic. Competitiveness and economic evaluation. Comparative and models; Energia solar fotovoltaica. Competitividad y evaluacion economica. comparativa y modelos

    Energy Technology Data Exchange (ETDEWEB)

    Collado Fernandez, E.; Colmenar Santos, A.; Peire Arroba, J.; Carpio Ibanez, J.; Castro Gil, M. A.

    2010-07-01

    Limits have been evaluated in the medium and long term economic competitiveness of solar photovoltaic energy in general and Spain in particular, considering the level of evolution that must have this form of energy production, until it become cevitamin with the other traditional energy sources and other emerging growth. to conduct the study, has developed a scenario-based methodology photovoltaic, which has taken account of the Spanish state regulation because it is vital operation on the road to real competitiveness relative to other types of energy. (Author) 10 refs.

  16. Una propuesta metodologica para la evaluacion del proceso de enseñanza-aprendizaje en un ambiente virtual

    Directory of Open Access Journals (Sweden)

    Fernandez, F.

    2007-07-01

    Full Text Available This article provides a methodological proposal oriented to optimize the assessment process of a student performance on an on line environment through the application of group communication techniques (advisor-student, student-advisor, studentstudent, student-chat and so on and widespread use of the new technologies on information and telecommunication as basic tools, based one the process follow-up and statistical data collection from the student´s learning performance and behaviour to enable the construction of significant and reliable indexes thus allowing the advisor a diagnostic on the student´s attitude and performance, allowing him to take on time the adequate preventive/corrective decision measures based on a success/failure tests outputs from the student performance, on a day- to- day basis, on the line environment.

  17. Evaluation of the ionization quenching correction for several liquid scintillators; Evaluacion de la extincion por ionizacion para diversos liquidos centelleadores

    Energy Technology Data Exchange (ETDEWEB)

    Los Arcos, J. M.; Borras, C.

    1990-07-01

    The most appropriate computational model for the ionization quenching function Q(E) is analyzed for electrons in liquid scintillators. A numerical evaluation of Q(E) from 0.1 keV to 3 MeV which the kB parameter varying between 0.005 and 0.010 cm/MeV is presented for seven scintillators; Toluene, Toluene-Alcohol, PCS, Toluene-CCl4, INSTAGEL, Dioxane-Naphtalene and HISAFE II. The numerical result are summarized as tables of Ieast squares fitting coefficient which make easy the computation of Q(E). (Author)

  18. Evaluacion del factor central y periferico en fatiga muscular en pacientes com daño piramidal

    OpenAIRE

    Schutz,Carlos G.; Marcela E. Panizza; Cohen, L.G.; R. Rey; Olga P. Sanz

    1983-01-01

    Para evaluar algunos de los componentes de la fatiga muscular en el daño piramidal, se seleccionó un grupo de 15 pacientes con hemiparesia faciobraquiocrural de severidad variable, los cuales fueron sometidos a un esfuerzo muscular, durante el cual se evaluaron los cambios de la frecuencia y duración de los potenciales positivos y negativos del EMG, asi como los sufridos por la onda M máxima al principio y fin del mismo. El estudio fue realizado en el lado parético, el contralateral y en un g...

  19. Spanish nuclear industry experience in the evaluation of suppliers; Experiencias del sector nuclear espanol en la evaluacion de suministradores

    Energy Technology Data Exchange (ETDEWEB)

    Ramos Pellejero, J. L.; Martinez, J. A.; Gomez, R.; Pablos, C. de; Herrero, J.

    2012-07-01

    The paper aims to present the experiences identified by the Evaluation Panel Suppliers in fulfilling its role of supplier evaluation of goods and services {sup s}afety related{sup .} It belongs to UNESA and its main objective the evaluation of the quality system of the supplier against the basic rules applicable. With it you get two main benefits: - standardize evaluation criteria share experiences between suppliers and better management of own resources. - market access to all Spanish nuclear fleet by a single evaluation. From the experience gained, it can be concluded that there is a population of highly technically qualified suppliers to meet equipment requirements.

  20. Evaluacion de una formulacion quimica para eliminar danos de la formacion, por precipitacion de escamas de carbonato de calcio

    National Research Council Canada - National Science Library

    Gonzalez-Nunez, Freya; Ramirez-Pereda, Blenda; Echevarria Pestana, Felix

    2012-01-01

    .... Debido a esto, es importante disponer de una variedad de formulaciones acidas, destinadas a la optimizacion de la eliminacion del dano de la formacion, minimizando la obtencion de precipitados daninos...

  1. La evaluacion de la percepcion de la comunicacion emocional de los padres en ninos desde la neuropsicologia

    National Research Council Canada - National Science Library

    Guaita, Valeria Laura

    2010-01-01

    ... adaptativos en situaciones de excitacion emocional y se reflejan en la capacidad para manejar las emociones propias, resultando en una autoestima mejorada y una resiliencia adaptativa al enfrentarse...

  2. Evaluation of radioactive facilities safety using event trees; Evaluacion de la seguridad de instalaciones radiactivas utilizando arboles de evento

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez Saiz, A.; Cornejo Diaz, N.; Callis Fernandez, E.

    2004-07-01

    The validity of using the Event Trees as an adequate quantitative analysis model for doing radiological safety assessments of radioactive facilities is presented in this work. The radiological safety assessments made for four Departments of Radiotherapy (Teletherapy with Co-60 and High Dose Rate afterloading brachytherapy with Ir-192) from different hospitals were taken as the base for the analysis. By the use of this model were obtained quantitative results. The probabilities to reach a typical scenario in a first stage, and then, based on previously doses calculations in the same scenario, the total risk values, were obtained. The unauthorized entry into a radiation room while the source is in its fully exposed position was the main scenario identified. The numerical values obtained using this model supported the radiological safety assessments made during the licensing process of those installations. The analysis of the intrinsic safety systems of the radiotherapy equipments was not included in the study because it's design was accepted by the Regulatory Authority and also meet the criterion of proven effectiveness. The use of this model let us suggest modifications such as the adding of any component to the system and/or the change of its position in order to minimize the probability of reaching the mentioned scenario. The model is also useful to confirm that the present international requirements for the safety systems in this type of facilities lead to practices with better or similar total risk levels than others considered as safe. (Author)

  3. English; Evaluacion de la dosis efectiva annual debido a fuentes ambientales de radiacion en la Provincia de Holguin, Cuba

    Energy Technology Data Exchange (ETDEWEB)

    Brigido Flores, Osvaldo; Barreras Cabellero, Aldo A.; Montalvan Estrada, Adelmo [Laboratorio de Vigilancia Radiologica Ambiental de Camaguey (Cuba)]. E-mail: sean@caonao.cmw.inf.cu; Hernandez Perez, Alberto; Tamayo, Luis Perez; Parra Valdes, Dermidio; Bravo Lopez, Rosendo [Centro de Atencion a la Actividad Nuclear, Holguin (Cuba); Zerquera, Juan Tomas [Centro de Proteccion y Higiene de las Radiaciones, La Habana (Cuba)

    2001-07-01

    A survey program aiming at studying the natural radioactivity in the Province of Holguin is a part of the national program carried out for 3 years. Radiological measurements carried out with a portable ionization chamber RSS-111 and RSS-112 at the sampled sites revealed an average outdoor absorbed dose rate of 43.5 nGy.h{sup -1} due to cosmic rays and terrestrial gamma radiation. Ratio of indoor to outdoor absorbed dose rates in air was 1.6. The average value of absorbed dose rate in air for the ionizing component of cosmic rays was 31.9 nGy.h{sup -1} at sea level. Because of the 82% of the Holguin population lives at altitudes close to sea level (10-200 m), the absorbed dose rate in outdoor air from ionizing component of cosmic rays was estimated to be 33.8 nGy.h{sup -1}. An annual average effective dose equivalent of 340 {mu}Sv was estimated for Holguin population due to the ionizing component of cosmic and gamma terrestrial radiation. This value is lower the 510 {mu}Sv.year{sup -1} estimated for the Camaguey population and lower than the 760 {mu}Sv.year{sup -1} estimated as a world average by UNSCEAR (1993). (author)

  4. Evaluacion de DesempeÑo de AFP's: Una aproximaci on para evitar costos asociados al Riesgo Moral

    OpenAIRE

    MuÑoz G., DANIEL

    2011-01-01

    El presente trabajo propone un portafolio benchmark que sea capaz de reemplazar la actual legislación referente a la rentabilidad mínima. La evaluación seg un desempeño relativo que impone la rentabilidad m nima acarrea costos a los a liados que son evitables bajo una evaluaci ón de desempe~no absoluta. Usando el esquema de Black y Litterman (1992) se concluye que el sistema de AFP's escoge portafolios sub optimos en gran parte de la muestra considerada, pudiendo ser signi- ...

  5. Evaluaciones de impacto en la cooperación para el desarrollo = Impact evaluations in international development co-operation

    OpenAIRE

    Larrú, José María

    2014-01-01

    Los diseños experimentales están actualmente en la frontera metodológica de la evaluación de impacto y de la economía del desarrollo. Se enfrentan a críticas, algunas generales a toda evaluación, otras específicas de su diseño aleatorizado. El

  6. Evaluation of air pollution due to natural radioactive elements; Evaluacion de contaminacion del aire debido a elementos radiactivos naturales

    Energy Technology Data Exchange (ETDEWEB)

    Perez, B. A.; Lopez, M. E., E-mail: bertin.perez@pucp.edu.pe [Pontificia Universidad Catolica del Peru, Seccion Fisica, Av. Universitaria 1801, San Miguel, Lima (Peru)

    2014-08-15

    The presence of radioactive materials in the crustal and as consequence present in the surface, originate the natural radioactive contamination in the different solid, liquid and gaseous materials; particularly in the air that we breathe. Among these radioactive materials that contribute to the environmental pollution are the presences of uranium, radio, thorium and their respective disintegration chains, as the gas radon (Rn-222) that spreads in the air; whose presence increases in areas where the seismic activity is notorious or other natural events take place, case of the Lima (Peru) City. In this work we show the measurements realized during two consecutive years in the roof of a building of three floors in the Lima City, with the purpose of establishing the fluctuations of this gassy pollutant in the surrounding air. The measurements were made using nitrocellulose detectors (Lr-115 type 2) applying the nuclear prints technique. The obtained results allowing to have an indicator of the Rn-222 presence in the air during different seasons of the year and also the presence of other possible radioactive pollutants. The use of this technique allows obtaining and studying the prints that generate the alpha particles that are emitted during the Rn-222 disintegration or by means of their descendants or predecessors; also allowing to discriminate between the short-range tracers or lineal type prints and other very different prints obtained during some of the measurements. The results analyzed according to proposed models are presented in this work. (author)

  7. MATLAB platform for Monte Carlo planning and dosimetry experimental evaluation; Plataforma Matlab para planificacion Monte Carlo y evaluacion dosimetrica experimental

    Energy Technology Data Exchange (ETDEWEB)

    Baeza, J. A.; Ureba, A.; Jimenez-Ortega, E.; Pereira-Barbeiro, A. R.; Leal, A.

    2013-07-01

    A new platform for the full Monte Carlo planning and an independent experimental evaluation that it can be integrated into clinical practice. The tool has proved its usefulness and efficiency and now forms part of the flow of work of our research group, the tool used for the generation of results, which are to be suitably revised and are being published. This software is an effort of integration of numerous algorithms of image processing, along with planning optimization algorithms, allowing the process of MCTP planning from a single interface. In addition, becomes a flexible and accurate tool for the evaluation of experimental dosimetric data for the quality control of actual treatments. (Author)

  8. Evaluation of the shielding of a room for radiodiagnostic; Evaluacion del blindaje de una sala para radiodiagnostico

    Energy Technology Data Exchange (ETDEWEB)

    Padilla R, Z. P. [Servicios de Salud de Zacatecas, Hospital de Especialidades en Salud Mental, Prolongacion 5 de mayo 1702-Sur, Parque Industrial, 98500 Calera de Victor Rosales, Zacatecas (Mexico); Acuna D, E.; Escareno J, E.; Vega C, H. R. [Universidad Autonoma de Zacatecas, Unidad Academica de Estudios Nucleares, Calle Cipres No. 10, Fracc. La Penuela, 98068 Zacatecas (Mexico)

    2011-10-15

    The X-ray discovery by Roentgen in 1895 and its application in diagnosis was a breakthrough in medicine. Worldwide, X-ray technique is one of the most widely used procedures in medical diagnosis. At the Mental Health Hospital of Calera Zacatecas a room has been designed as radiology room, however there is not a record of shielding characteristics. In order to determine the features of X-ray equipment that the room can host, in this work a series of calculations were carried out. Calculations were based upon the NCRP 151 recommendations and fulfilling the requirements given in the Mexican standard NOM-229-SSA1-2002. From the actual room conditions this can host a X-ray equipment without fluoroscopy, with a workload of 80 ma-min/week, with 125 k Vp as maximum operating voltage. From the actual conditions a set of recommendations, for better protection of radiation workers and public are also given. (Author)

  9. Dosimetric evaluation of Radiotherapy units wit {sup 60}Co; Evaluacion dosimetrica de unidades de radioterapia con {sup 60}Co

    Energy Technology Data Exchange (ETDEWEB)

    Leon, B. Salinas de; Tovar M, V.; Becerril V, A. [Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    2000-07-01

    The SSDL network of the IAEA performs, every year, quality audit tests for radiotherapy services ({sup 60} Co units and linear accelerators), and for national SSDL as well. Because of the SSDL-Mexico results in these tests and due to our enthusiasm and confidence in our work, a parallel test has been done , which is described in this talk as well as the results. Nowadays, a second parallel test goes up, which could confirm our optimism and open the possibility to our country to start a national dosimetric audit of {sup 60} Co radiotherapy units. (Author)

  10. El programa de estudios: Naturaleza, objectivos, planeamiento, aplicacion y evaluacion (Curriculum: Its Nature, Objectives, Planning, Application, and Evaluation).

    Science.gov (United States)

    Martinez, Maria L., Comp.

    A proposal is advanced to the Latin American nations by the Department of Educational Affairs, Organization of American States (OAS), for a joint program of enacting educational reform. As mediator, the OAS recommends as an initial step the distribution of various publications offering information on actual educational programs currently in…

  11. Evaluacion de la cromatografia ionica para fomentar su uso en la investigacion y estudios de posgrado en ciencias del agua

    National Research Council Canada - National Science Library

    Trujillo, Eduardo; Fonseca, Guadalupe; Garcia, Miriam A; Martinez, Veronica

    2009-01-01

    .... Los resultados encontrados permiten afirmar que la cromatografia ionica es una tecnica analitica cualitativa y cuantitativa, rapida, economica, sensible y confiable y que puede ser realizada por estudiantes entrenados, no requiriendo de larga especializacion.

  12. Current evaluation of the information about Radiological Protection in Internet; Evaluacion actual de la informacion sobre proteccion radiologica en Internet

    Energy Technology Data Exchange (ETDEWEB)

    Ruiz-Cruces, R.; Marco, M.; Villanueva, I.

    2003-07-01

    To analyze the current situation about the pedagogic information on radiological protection training which could be found in Internet. More than 756 web-pages have been visited in Internet about Radiological Protection in the nuclear and medical fields, providing information mainly focusing on information to the members of the public. In this search were used internet Searching Appliance (as Copernicus, Google and Scirus), using key words related with this subject (as Radiological Protection and Health Safety), getting the internet address of organizations, societies and investigation groups. Only a low percentage (less than 5 per cent) of these addresses content information on Radiological Protection for the members of the public, including information about the regulator Organizations, and which are the objectives for protection of the members of the public against ionization radiation (from the point of view of the use of the ionization radiation in the medical and nuclear field). This work attempts to propose the use of internet as a tool for informing the members of the public in matter of radiological protection, as first link in the chain of the training and education. (Author)

  13. Sistema de evaluaciones en línea como herramienta para los niveles de educación media superior

    Directory of Open Access Journals (Sweden)

    Diego Armando Centeno Brambila

    2015-03-01

    Full Text Available El presente artículo trata sobre la información recabada y el software desarrollado como resultado de las principales necesidades que debe de cubrir una herramienta informática para la elaboración de exámenes a nivel bachillerato en México. En la actualidad el uso de las tecnologías en línea en las instituciones educativas se han convertido en una herramienta de gran importancia y necesidad. Por lo tanto, esta investigación propone el desarrollo de un Sistema Web simple y fácil de usar por profesores del nivel medio superior, para la elaboración de exámenes con características de pruebas estandarizadas de tipo clase o de uso en el aula; y que permita además la evaluación utilizando un algoritmo de selección de preguntas de un repositorio.

  14. Evaluaciones calorimétricas de la precipitación en aleaciones Cu-Co-Si, ricas en Cu

    Directory of Open Access Journals (Sweden)

    Donoso, Eduardo

    2001-08-01

    Full Text Available The precipitation process of cobalt and silicon atoms from supersaturated solid solutions of Cu-Co-Si for two compositions was studied by differential scanning calorimetry (DSC. Calorimetric traces analysis showed the presence of two overlapping exothermic reactions (stages 1 and 2, which can are attributed to two precipitation processes. First stage correspond to the preceding formation of a cobalt precipitate, while the second stage correspond to the formation of stoichiometric CO2Si composition which takes place by silicon diffusion to the first precipitate. Heat contents during the stages 1 and 2 are proportional to precipitates volume fractions. Activation energies of both precipitates, calculated from the Kissinger method, are consistent with those corresponding to diffussion of Co in Cu and Si in Cu. Both processes can be decribed by the Johnson-Mehl Avrami (JMA equation. Values of n are compatible with precipitate nucleation from the solid solution (stage 1 and with growth of paticles from preexisting Co precipitates. Furthermore,, the kinetic of the concentration decay of Co and Si in the matrix was estimated as function of the transformated fraction for each thermal event and from their respective volume fractions.

    Mediante calorimetría diferencial de barrido (DSC se estudió el proceso de precipitación de átomos de cobalto y silicio a partir de dos soluciones sólidas supersaturadas de Cu-Co- Si. El análisis de las trazas calorimétricas muestra la presencia de dos reacciones exotérmicas traslapadas (etapas 1 y 2, que se interpretan como la formación de dos tipos de precipitados. La primera etapa corresponde a la formación precursora de un precipitado de cobalto, en tanto que la etapa 2 corresponde a la formación de un precipitado de composición estequiométrica CO2Si producido por difusión de silicio hacia la primera partícula. Los calores liberados durante las etapas 1 y 2 son proporcionales a las fracciones volumétricas de los precipitados. Las energías de activación de ambas reacciones, calculadas por el método de Kissinger, son consistentes con aquellas correspondientes a la difusión de Co en Cu y Si en Cu, respectivamente. Ambos procesos pueden ser descritos mediante la ecuación de Johnson-Mehl-Avrami (JMA, cuyos valores de n son cornpatibles con la nucleación de precipitados a partir de la solución sólida (etapa 1 y con crecimiento de partículas a partir de precipitados pre

  15. La interpretación de la realidad del destino por parte de los turistas: evaluaciones cognitivas y afectivas

    Directory of Open Access Journals (Sweden)

    María José Andrade Suárez

    2012-01-01

    Full Text Available En un contexto de intensa competitividad entre los destinos turísticos, la imagen percibida es un elemento clave y desempeña, a su vez, un papel fundamental en la elección del destino puesto que los valores que se asocian a ésta, representan un factor determinante en el proceso de decisión de compra de los potenciales turistas. Este hecho es debido a que la actitud del turista hacia un determinado destino es resultado de la percepción, reflejo de la imagen, que se ha formado del mismo. El objetivo general de este trabajo consiste en presentar un procedimiento para la identificación de la imagen percibida a priori del destino turístico. Con esta finalidad, se analizará el conjunto de componentes cognitivoafectivos que conforman la imagen del turismo rural en Galicia. Los resultados que se obtienen del estudio, realizado con un total de 400 cuestionarios a turistas rurales, demuestran que la imagen posee una naturaleza multidimensional que hace referencia tanto a las creencias y conocimientos que el turista posee sobre los atributos del destino (dimensión cognitiva como a los sentimientos de éste hacia ese lugar (dimensión afectiva.

  16. Guia para la Elaboracion y Evaluacion de Proyectos de Investigacion (Guidelines for Reporting and Evaluating Research Projects).

    Science.gov (United States)

    Morles, Victor

    This article establishes guidelines for conducting and evaluating research projects according to a scientific methodology. The organizational format suggested here follows an outline with elements and details that should be considered in an investigation. Each part of the proposed outline is explained, and terms are defined. Project evaluation is…

  17. Propuesta de un modelo financiero para la evaluacion de la inversion en un aeropuerto bajo asociacion publico-privada

    National Research Council Canada - National Science Library

    Gonzalez-Ruiz, Juan David; Echeverri-Gaviria, Sebastian; Ospina-Rendon, Diego Alejandro

    2014-01-01

    La administracion de un aeropuerto implica cierto nivel de complejidad, para lo cual los Estados hacen uso de alianzas publico-privadas para delegar esta responsabilidad a entidades concesionarias especializadas...

  18. EVALUACION DEL DAÑO OXIDATIVO INDUCIDO POR LOS RADICALES PEROXILOS HIDROSOLUBLES SOBRE PROTEINAS DEL GLOBO OCUALR

    OpenAIRE

    ARENAS LISSI, ANDREA BEATRIZ; ARENAS LISSI; ANDREA BEATRIZ

    2013-01-01

    En esta tesis se estudiaron las modificaciones tanto químicas como estructurales de diferentes proteínas presentes en el globo ocular (lisozima, glucosa 6-fosfato deshidrogenasa y proteína de lente de bovino) causadas por la acción de los radicales peroxilos generados a partir de la termólisis del cloro hidrato de 2,2'azobis(amidinopropano) en presencia de oxígeno. El estudio de los geles de poliacrilamida, dieron cuenta de la ocurrencia de entrecruzamiento y fraccionamiento proteico...

  19. Photochemical degradation of emerging contaminants by solar processes: analytical assessment; Degradacion fotoquimica de contaminantes emergentes mediante procesos solares. Evaluacion analitica

    Energy Technology Data Exchange (ETDEWEB)

    Perez Estrada, L. A.; Aguera Lopez, A.; Malato Rodriguez, S.

    2009-07-01

    In recent years, the presence of pharmaceuticals in the aquatic environment has reached a growing interest. These new contaminants are important because many of them are not degraded under the typical biological treatments applied in the wastewater treatment plants and represent a continuous input into the environment. Thus compounds such as diclofenac, dipyrone and malachite green are present in surface waters in all Europe and crucial need for more enhanced technologies that can reduce its presence in the environment has become evident. In this sense, solar advanced oxidation processes represent a good choice for the treatment of hazardous non-biodegradable pollutants. This work deals with the solar photodegradation of these contaminants in aqueous solutions by TiO{sub 2} photo catalysis and photo-Fenton reaction. A pilot-scale facility using a compound parabolic collector (CPC) reactor was used for this study. Results obtained show rapid and complete oxidation of parent compounds and partial mineralization of dissolved organic carbon. The two treatment are compared on the basis of their kinetics (parent compound and TOC), formation of degradation products (as determined by ionic chromatography, GC/MS and LC/TOF-MS), and toxicity (as evaluated by Vibrio fischeri bacteria). (Author)

  20. EVALUACION DEL EFECTO EPIGENETICO DE LA INACTIVIDAD FISICA EN EL ORIGEN DE LA DIABETES MELLITUS TIPO 2: ESTUDIO EXPERIMENTAL

    OpenAIRE

    MARQUEZ ANDRADE, JOSE LUIS

    2010-01-01

    La Diabetes mellitus tipo 2 (DM2) es una enfermedad multifactorial que está relacionada con obesidad y bajos niveles de actividad física. Las investigaciones previas comúnmente han asociado la DM2 con los niveles de actividad física en la adultez. Sin embargo, poco es lo que se conoce acerca del rol de la inactividad física, en estadíos tempranos del desarrollo, en la predisposición a un fenotipo insulino resistente el cual puede estar relacionado con DM2 cuando el sujeto adulto es expuesto a...

  1. Evolution of sensitization in stainless steel AISI 304; Evaluacion del grado de sensibilizacion en el acero ionxidable AISI 304

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez, O.; Santos, G.

    2003-07-01

    Austenitic stainless steel, when heat-treated at 550-850 degree centigree became susceptible to intergranular corrosion in acids. this phenomenon, know as sensitization, it is result from the precipitation of chrome carbides in the grain boundary, making these areas less resistant to corrosion. Two different electrochemical reactivation tests are compared with a destructive test and related to the classification of its respective microstructures. It was established a quantitative methodology to evaluate the degree of sensitization in AISI 304and also to compare the correspondence of the results with the data of the automatic and portable EPR device for non-destructive field measurement of the degree of sensitization. The used electrochemical techniques were the EPR (Electrochemical Potentiokinetic Reactivation) or single loop test and the PRP (Pasivation Reactivation Potentiokinetic) or double loop test. The destructive test used was boiling, 120 h ferric sulfate-50% sulfuric acid, according to the standard practices ASTM A-262 practices B. The classifications of etch structures were according to the standard practices ASTM A-262 practices B. (Author)

  2. EVALUACION DE ASPECTOS INMUNOLOGICOS Y DESARROLLO DE UN MODELO MURINO DE LA OBSTRUCCION RECURRENTE DE LAS VIAS AEREAS EN EQUINOS

    OpenAIRE

    MORAN RUZ, GABRIEL ROBERTO

    2008-01-01

    La Obstrucción Recurrente de las Vías Aéreas (ORVA) es consecuencia de un proceso inflamatorio originado por la inhalación de agentes alergénicos. Esta condición, debido a los mecanismos inmunológicos que intervienen en la patogénesis tiene alguna similitud con el asma humana. Esta patologia también fue conocida como Enfermedad Pulmonar Obstructiva Crónica (EPOC) (Jackson y col 2000). Pero según Robinson (2001), el término EPOC es inapropiado para describir este cuadro, ya que el tipo de r...

  3. DIFERENCIAS INDIVIDUALES EN LOS PERROS DOMÉSTICOS (CANIS FAMILIARIS: REVISIÓN DE LAS EVALUACIONES CONDUCTUALES

    Directory of Open Access Journals (Sweden)

    Adriana Jakovcevic

    2009-01-01

    Full Text Available El estudio de las diferencias individuales en el comportamiento de los perros domésticos tiene un gran valor aplicado dado que permite una mejor selección de los mismos para cumplir las variadas funciones que tienen en la sociedad humanacomo perros guía, policía, compañía, rescatistas de personas, etc. En el trabajo que se informa se presenta una revisión de estudios sobre diferencias individuales en perros, basada únicamente en las baterías conductuales que evalúan un conjunto de rasgos del temperamento. Con este objetivo se realiza una breve descripción de cada batería de pruebas utilizadas en la literatura, analizando las definiciones operacionales de las variables eva luadas y los diferentes tipos de estímulos utilizados. Los rasgos mayormente evaluados son: temerosidad, agresividad, disposición al entrenamiento y sociabilidad. La te merosidad, en general es evaluada a través de la respuesta del animal ante la aparición de un estímulo súbito que puede ser intenso o no, como por ejemplo la reacción frente a un ruido fuerte, la apertura de un paraguas, o la aparición repentina de una figura humana. La agresividad se mide a través de la reacción frentea la amenaza o provocación por parte de un humano, la sustracción de un objeto o la confrontación con un perro dominante. La disposición al entrenamiento es estudiada a través de la respuesta del animal frente a diferentes estímulos como el juego con un trapo o una cuerda, el ejercicio de devolución de un objeto o la obediencia frente a distintos comandos. Por último, la sociabilidad se evalúa con la aparición o el acercamiento de un humano desconocido o con la exposición a un perro no familiar. Se discuten además las limitaciones metodológicas de las baterías así como también los importantes usos aplicados de las mismas.

  4. Evaluacion constante del virus de la enfermedad de Newcastle en aves silvestres de la laguna albufera de medio mundo

    National Research Council Canada - National Science Library

    Mendoza R., Luis; Icochea D., Eliana; Gonzalez Z., Armando; Gonzalez V., Rosa

    2012-01-01

    El estudio evaluo la presencia del virus de la Enfermedad de Newcastle en la laguna Albufera de Medio Mundo, situada al norte de Lima, y habitada por diversas especies de aves silvestres y migratorias...

  5. Evaluacion de la altura de la cresta osea de caninos impactados tratados ortodonticamente y caninos con erupcion natural

    National Research Council Canada - National Science Library

    Lobo Figueredo, Aura Mercedes; Hernandez Diaz, Liliana Alexandra; Moreno Abello, Gloria Cristina; Diaz Jaramillo, Ivan Orlando

    2014-01-01

    ...: Evaluar la altura de la cresta osea alveolar despues de realizar la traccion ortodontica de caninos impactados en el maxilar superior y compararla con un grupo control de caninos contralaterales...

  6. La evaluacion de la docencia ante el reto del espacio europeo de educación superior (EEES

    Directory of Open Access Journals (Sweden)

    Carmen Calderón Patier

    2008-01-01

    Full Text Available El principal objetivo del proceso de convergencia de la enseñanza superior que estamos viviendo, en el marco del Espacio Europeo de Educación Superior (EEES, es convertir a los sistemas universitarios europeos en un referente internacional por la calidad de la enseñanza impartida. Ello exige una revisión, actualización y adaptación de las actuales metodologías docentes y de su organización, así como del establecimiento de técnicas y prácticas que permitan evaluar integralmente la enseñanza. En este contexto, el presente trabajo se analizan los tres pilares de la evaluación de la educación superior: en primer lugar, la evaluación del alumnado (o del aprendizaje según las diferentes formas alternativas de evaluación de los resultados de los alumnos, en segundo lugar, la evaluación de la actividad docente, analizando las ventajas e inconvenientes de las encuestas de opinión, y por último la evaluación institucional de la docencia

  7. Evaluacion de que consister y por que se lleva acabo? (Evaluation: What Does it Consist of, and for What Purpose?).

    Science.gov (United States)

    Austin Independent School District, TX. Office of Research and Evaluation.

    A guide is presented for the evaluation of the bilingual programs in the Austin, Texas, Independent School District. The reasons for an evaluation and a definition of program objectives and evaluation instruments are given. The program components, objectives and evaluation instruments for each grade level (K-4) are listed. The components involved…

  8. Test de Evaluacion de Conocimientos Medicos-CIIPME (Test of Evaluation of Medical Knowledge-CIIPME). Publication No. 42.

    Science.gov (United States)

    Alfici, C.; And Others

    The purpose of this research is to build a test for the evaluation of the knowledge needed by medical students before entering clinical courses in medical school. The criterion for this was provided by teachers in both the pre-clinical and clinical subjects. The Pilot instrument consisted of 335 items that covered 8 sections. Each one of these…

  9. Assessment tool for planning fallback Tomotherapy treatment plans; Evaluacion de la herramienta fallback planning para planes de tratamiento de tomoterapia

    Energy Technology Data Exchange (ETDEWEB)

    Sanchez Rubio, P.; Rodriguez Romero, R.; Montes Uruen, A.

    2015-07-01

    Interruption of radiotherapy treatments in an increase the total time of the same to the detriment of tumour control. In centers that have a unique special unit as the TomoTherapy, is emphasized the difficulty to resume treatment at another unit, since the technique of helical TomoTherapy is not portable to conventional accelerators and therefore requires the planning of new dosimetry distributions emulating the initially obtained and accepted. This work evaluates the ability of an automatic planning tool to mimic TomoTherapy plans. (Author)

  10. Desarrollo y evaluacion psicometrica de una forma abreviada de la escala de posicionamiento ante el diagnostico enfermero

    Directory of Open Access Journals (Sweden)

    Jose Manuel Romero-Sanchez

    2013-06-01

    Full Text Available El Position on Nursing Diagnosis (PND es una escala que utiliza la técnica del diferencial semántico para medir las actitudes hacia el concepto diagnóstico enfermero. El estudio objetivó desarrollar una forma abreviada de la versión española de esta escala, evaluar sus propiedades psicométricas y eficiencia. Se utilizó un doble enfoque empírico-teórico para obtener una forma reducida del PND, el PND-7-SV, que fuera equivalente a la original. Mediante un diseño transversal a través de encuesta, se evaluó la fiabilidad (consistencia interna y fiabilidad test-retest, validez de constructo (análisis factorial exploratorio, técnica de grupos conocidos y validez discriminante y de criterio (validez concurrente, sensibilidad al cambio y eficiencia del PND-7-SV en una muestra de 476 estudiantes de enfermería españoles. Los resultados avalaron la utilidad del PND-7-SV para medir las actitudes hacia el diagnóstico enfermero de manera equivalente a la forma completa de la escala y en un tiempo más reducido.

  11. Evaluacion del uso de protocolos de operatoria en las instituciones prestadoras de salud de Medellin.(Resumenes de Investigacion)

    National Research Council Canada - National Science Library

    Pelaez, Alejandro; Lopez, Pablo; Gaviria, Juliana Maria; Perez, Leonardo; Gaviria, Luisa Fernanda; Patricia Ortiz, Diana; Saldarriaga, Alexandra

    2010-01-01

    La caries dental como enfermedad infecciosa, microbiana y multifactorial es en la actualidad considerada como una de las enfermedades mas prevalentes en los seres humanos implicando un verdadero problema de salud...

  12. Evaluacion de dos presentaciones de envasado al vacio de visceras de ovino en Mexico durante su refrigeracion

    National Research Council Canada - National Science Library

    Figueroa Rodriguez, Katia Angelica; Hernandez Rosas, Francisco; Alvarez Olguin, Miguel; Figueroa Sandoval, Benjamin; Carrillo Hidalgo, Oscar Miguel

    2013-01-01

    Las visceras de borrego (Ovis aries) son utilizadas en la zona central de Mexico para la elaboracion del platillo tipico "pancita" existiendo pocos estudios que determinen la inocuidad de las visceras empleadas...

  13. [Quality analysis of clinical practice guidelines on cardiovascular risks in the Basque country and a proposal for their evaluacion].

    Science.gov (United States)

    Casi Casanellas, A; Aizpuru Barandiarán, F; Ibáñez Pérez, F

    2000-11-30

    To find the implantation and quality of clinical practice guidelines (CPG) to manage the major cardiovascular risks: tobacco dependency, hypertension, hyperlipaemia and diabetes mellitus. To work out a model to evaluate the quality of the CPG in primary care. Cross-sectional descriptive study. The primary care centres of the Basque Country. 170 CPG used at present to manage the four mentioned cardiovascular risks. Information was requested on the use of CPG and copies of their guidelines were requested from those in charge of 103 ranked centres. 77 centres replied (76%), of which 66 said they used one of them. A total of 170 CPG were received. On the basis of non-specific prior proposals for primary care, 21 quality criteria for the CPG, grouped in 6 blocks, were drawn up. Top quality was found in the block for clarity of clinical procedure with 63% compliance with the CPG, followed by general description (54%), and evaluation and measurement of impact (30%). The blocks with worst compliance were identification of people involved in their design (23%), evidence of their recommendations (19%) and conditions of application (4%). A model was proposed to evaluate the quality of the CPG. Major deficiencies in quality were found. These were most marked in key aspects such as bibliographic support for their recommendations, envisaging of conditions for application and identification of authors and reviewers.

  14. Adaptacion de una bateria para la evaluacion de prerrequisitos para el aprendizaje de la Estadistica en Psicologia.

    OpenAIRE

    Guàrdia Olmos, Joan; Peró, Maribel; Mancho-Fora, N.; Farràs-Permanyer, L.

    2012-01-01

    Las investigaciones recientes sobre docencia universitaria en Estadística se han centrado en identificar las principales variables que afectan al rendimiento académico. El objetivo de este estudio es analizar las propiedades psicométricas de cuatro cuestionarios (SAS, SATS, MSES-R, PMP) presentados como una batería de prerrequisitos para el aprendizaje de la Estadística, y por tanto potenciales predictores del rendimiento. Método: La batería se administró a una muestra de 96 estudiantes del G...

  15. Evaluacion del suministro de medicamentos en los servicios de atencion primaria de salud de Rosario, Argentina, 2005

    National Research Council Canada - National Science Library

    Botta, Carina A

    2009-01-01

    Metodos. Se utilizo una combinacion de varias herramientas de gestion: analisis de Pareto para determinar el peso de los diferentes medicamentos en el presupuesto de la Secretaria de Salud Publica del municipio de Rosario...

  16. Glass characterization to assess the airborne sound isolation; Caracterizacion de vidrios para la evaluacion del aislamiento acustico a ruido aereo

    Energy Technology Data Exchange (ETDEWEB)

    Alba Fernandez, J.; Rey Tormos, R. del; Ramis Soriano, J.; Berto Carbo, L.

    2012-11-01

    The main contribution of this paper is the formulation of an alternative to experimental determination of loss factor and, consequently, to improve the predictions of airborne sound insulation for any type of monolithic or laminated glass. In addition, a review of the standards related to measurement of mechanical parameters of glass is carried out, with particular interest in laminated glass Indeed, one of the problems that arise in the current context of building acoustics is to meet the requirements of facades airborne sound insulation of existing Building Technical Code (BTC). It is known that the blind and the hollow part of the facade should be distinguished. The weakest part regarding to airborne sound insulation is the empty one (consisting of glass, woodwork and other elements). Choosing an adequate woodwork makes the glass surface become the limiting factor. The Constructive Elements Catalog (CEC) of the BTC, the UNE-EN 12758:2011 standard, as well as some, increasingly, data vendors provide information about airborne sound insulation for monolithic glass, laminated glass and double glazing. In the case of laminated glass, these data are limited only to those with a single intermediate layer, and also nonacoustic. Can therefore be said that there is a gap of knowledge in this regard. To obtain reliable predictions of airborne sound insulation of multilayer partitions, such as laminated glass, mechanical characteristics must be known, being loss factor one of the most important. (Author) 7 refs.

  17. Evaluation of the shielding of dental X-rays units; Evaluacion del blindaje de unidades de rayos X dentales

    Energy Technology Data Exchange (ETDEWEB)

    Medrano, E.; Vega C, H. R.; Letechipia de L, C.; Hernandez D, V. M.; Salas L, M. A., E-mail: edumeco@yahoo.com.mx [Universidad Autonoma de Zacatecas, Apdo. Postal 336, 98000 Zacatecas (Mexico)

    2014-08-15

    The capacity of the walls of the dental radio-diagnostic rooms has been determined, to diminish the dose levels during the use of the X-rays equipment s. The study was carried out in the Dentistry Academic Unit of the campus Siglo X XI of the Universidad Autonoma de Zacatecas. The X-rays equipment s are a learning tool for the dentistry students and they are also used for offering health services to the population; for this reason is important to verify that the dose levels outside of the room walls are safe. During the evaluation process were used conservative approaches without prejudice of the thickness necessary in benefit of the radiological protection. Of the evaluation was found that all the walls satisfy their function thoroughly like barriers against the X-rays. (Author)

  18. Evaluacion del factor central y periferico en fatiga muscular en pacientes com daño piramidal

    Directory of Open Access Journals (Sweden)

    Carlos G. Schutz

    1983-09-01

    Full Text Available Para evaluar algunos de los componentes de la fatiga muscular en el daño piramidal, se seleccionó un grupo de 15 pacientes con hemiparesia faciobraquiocrural de severidad variable, los cuales fueron sometidos a un esfuerzo muscular, durante el cual se evaluaron los cambios de la frecuencia y duración de los potenciales positivos y negativos del EMG, asi como los sufridos por la onda M máxima al principio y fin del mismo. El estudio fue realizado en el lado parético, el contralateral y en un grupo control de voluntarios sanos, comparándose los resultados de los 3 grupos. Las curvas de frecuencia y duración del lado parético, el sano y el control mantuvieron las mismas tendencias, así como fue homologable el comportamiento de la onda M máxima en los 3 casos, lo cual indica que en la espasticidad, debido a daño de la vía piramidal, al igual que en la población normal, bajo las presentes condiciones de estudio, es el factor central el condicionante principal en el desarrollo de fatiga muscular.

  19. Thermomechanical evaluation of the fuel assemblies fabricated in the ININ; Evaluacion termomecanica de los ensambles combustibles fabricados en el ININ

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez L, H.; Ortiz V, J. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    2005-07-01

    The pilot plant of fuel production of the National Institute of Nuclear Research (ININ) provided to the Laguna Verde Nuclear Power Plant (CNLV) four fuel assemblies type GE9B. The fuel irradiation was carried out in the unit 1 of the CNLV during four operation cycles, highlighting the fact that in their third cycle the four assemblies were placed in the center of the reactor core. In the Nuclear Systems Department (DSN) of the ININ it has been carried out studies to evaluate their neutron performance and to be able to determine the exposure levels of this fuels. Its also outlines the necessity to carry out a study of the thermomechanical behavior of the fuel rods that compose the assemblies, through computational codes that simulate their performance so much thermal as mechanical. For such purpose has been developing in the DSN the FETMA code, together with the codes that compose the system Fuel Management System (FMS), which evaluates the thermomechanical performance of fuel elements. In this work were used the FETMA and FEMAXI codes (developed by JAERI) to study the thermomechanical performance of the fuel elements manufactured in the ININ. (Author)

  20. ISOINMUNIZACION Rh: EVALUACION DE LA UTILIDAD DEL DOPPLER DE ARTERIA CEREBRAL MEDIA EN LA PREDICCION Y MANEJO DE ANEMIA FETAL

    OpenAIRE

    2003-01-01

    Se presenta la experiencia en el manejo de pacientes altamente sensibilizadas por incompatibilidad Rh, analizando la utilidad de la evaluación de la velocidad circulatoria fetal, por Doppler-color, a través de la medición de la velocidad máxima sistólica (VMS) de la arteria cerebral media (ACM). Se realizan 19 transfusiones intravasculares en 3 casos afectados por esta enfermedad. En 14 de ellas se encontró anemia fetal moderada o leve, la que fue diagnosticada correctamente en 13 oportunidad...

  1. Vision general de las practicas de capacitacion en Peru

    National Research Council Canada - National Science Library

    Hernandez Pozas, Olivia; Lourdes Jauregui, Kety

    2012-01-01

    .... Este articulo tambien ayuda a establecer prioridades de investigacion futura. La Teoria de Capital Humano y contribuciones de evaluacion de necesidades, planeacion, implantacion y evaluacion de la capacitacion sirvieron como marco teorico...

  2. Technological impact in steels degree API 5L X-70 for the manufacture of resistant ducts of 36 inches of diameter to the bitter gas; Impacto tecnologico de aceros grado API 5L X-70 para la fabricacion de ductos de 36 pulgadas de diametro resistentes al gas amargo

    Energy Technology Data Exchange (ETDEWEB)

    Aramburo Perez, G.; Garcia Galan, S.; Perez Campos, R.; Juarez Islas, J.A. [Facultad de Quimica, UNAM, Mexico, D.F. (Mexico)

    2004-03-01

    Several steel plates in the as-hot rolled plus cooled condition were studied, in order to evaluate the impact of the steelmaking route and the controlled thermomechanical processing plus the cooling media. The steelmaking route to produce the slabs involved the use of 100% sponge iron which was feed into an electric arc furnace, vacuum degassed, ladle treated and continuously cast. After soaking, a controlled thermomechanical processing the resulting steel plates cooled in air showed a banded structure, which sometimes presented a central segregation region. The worst plates with a central segregation region showed intermetallic compounds in it. After modifications of the steelmaking route and the controlled thermomechanical/cooling schedule, a steel plate with a ferritic microstructure plus 0.5% in vol of bainite was obtained. This microstructure together with the resulting mechanical properties, fulfilled the API grade 5LX-70 properties, required by the petroleum industry. [Spanish] Se evaluo el impacto del proceso en la fabricacion de planchones de acero grado APIX-70, asimismo, el proceso de deformacion termomecanico controlado, mas enfriamiento de placas. El proceso para producir los planchones involucra el uso de 100% de hierro esponja, el cual es alimentado a un horno electrico, desgasificado al vacio y colado continuamente. Al planchon resultante se le aplica un programa de laminacion en caliente controlado y a las placas resultantes se le aplica un enfriamiento al aire o acelerado. La mayoria de las placas enfriadas al aire mostraron una estructura bandeada, algunas presentaron una region con segregacion central y otras las segregacion central mas la presencia de intermetalicos. Despues de modificar el proceso de fabricacion del acero, su control termomecanico y su programa de enfriamiento, se obtuvo una placa con una microestructura ferrifica mas un 0.5% en volumen de bainita. Esta microestructura junto con el resultado de sus propiedades mecanicas, cumplen con las propiedades del acero grado API 5L X-70, las cuales son requeridas en los tubos de acero por la industria petrolera.

  3. Vulnerability Assessment of the nuclear power plant Vandellos II before a tornado; Evaluacion de vulnerabilidad de C.N. Vandellos II ante tornado

    Energy Technology Data Exchange (ETDEWEB)

    Fernandez, A.; Encabo, J.; Vaz-Romero, A.; Moran, M. A.; Roch, M.; Nicolas, P.; Barrera, N.

    2010-07-01

    The purpose of this work was the study of vulnerability to tornado event Vandellos II NPP. To do this, we have evaluated all structures (buildings), security systems and components to the installation of wind stresses, depression and impact of projectiles, generated by a tornado on the site.

  4. Evaluacion de la precision intralaboratorio para la determinacion simultanea de ocho elementos en muestras geologicas aplicando la espectrometria de emision atomica con plasma acoplado

    National Research Council Canada - National Science Library

    Argota-Coello, Humberto; Fernandez-Heredia, Angel

    2012-01-01

    ... atomica (1); sin embargo la velocidad de respuesta del laboratorio estaba limitada, por lo que se decidio la compra de un equipo de espectrometria de emision atomica con plasma inductivamente acoplado (ICP-AES), para realizar el analisis simultaneo de estos 8 elementos (2). En breve tiempo el laboratorio multiplico su capacidad ana...

  5. Evaluation of different calibration curves QA of IMRT plans with radiochromic films; Evaluacion de diversas curvas de calibracion QA de planes de IMRT con peliculas radiocromicas

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez Rodriguez, J.; Martin Rincon, C.; Garcia Repiso, S.; Ramos Paheo, J. A.; Verde Velasco, J. M.; Sena Espinel, E. de

    2013-07-01

    The non-linear relationship between dose and the optical density, characteristic plates radiochromic Gafchromic EBT and EBT2, has been studied by various authors, whose publications are proposed different functional forms that fit the specific values measured curves that allow the full range of useful dose calibration. The objective of the work focuses on evaluating the influence of the use of different calibration curves in the dose measurement for quality control of IMRT treatments. (Author)

  6. Strategic environmental assessment of water planning: analisis of five experiences; La Evaluacion Ambiental Estrategica de la planificacion hidrologica: analisis de cinco experiencias

    Energy Technology Data Exchange (ETDEWEB)

    Cachon de Mesa, J. [Ministerio de Fomento. Madrid (Spain); Espaol Echaniz, I. [Universidad Politecnica de Madrid (Spain)

    1999-06-01

    This article presents the conclusions drawn out of a review of five cases of environmental assessment of water planning in Europe. These conclusions are the starting point for the development of proposals. (Author) 7 refs.

  7. Evaluation of the sorption of Eu(III) in titanium diphosphate; Evaluacion de la sorcion de Eu(III) en difosfato de titanio

    Energy Technology Data Exchange (ETDEWEB)

    Ortiz O, H.B.; Ordonez R, E.; Fernandez V, S.M. [ININ, Carretera Mexico-Toluca Km 36.5, Salazar, Estado de Mexico (Mexico)]. e-mail: hortiz@nuclear.inin.mx

    2007-07-01

    In this work its are presented: the synthesis, physicochemical characterization and the surface parameters estimation that can be related with the retention properties of the titanium diphosphate for the actinides of valence III (Pu, Am, Cm among others), using the Eu{sup 3+} like a chemical analog. The surface area, hydration time, zero charge point, density of active sites and the surface species distribution in the titanium diphosphate are reported. This information was used to explain the retention of the Eu(lll) in the surface of the titanium diphosphate. (Author)

  8. Evaluacion de la tecnica de contraimmunoelectroforesis para determinar la potencia antigena de las vacunas antirrabicas Evaluation ot the counterimmunoelectrophoresis technique to determine the antigenic potency of antirrabic vaccines

    Directory of Open Access Journals (Sweden)

    Graciela Miceli

    1993-12-01

    Full Text Available El método recomendado por la Organización Mundial de la Salud (OMS para la prueba de potencia de vacunas antirrábicas como producto final es la prueba NIH. Algunas técnicas in vitro se han propuesto para el control durante el proceso de produción y complementan el ensayo in vivo antes mencionado. Este trabajo presenta los resultados obtenidos cuando se utilizó la técnica de contrainmunoelectroforésis (CIE para determinar el contenido de antígenos en muestras de 84 y 40 lotes de vacunas antirrábicas producidas en tejido nervioso de cerebro de ratón lactante mediante cultivo de tejidos, respectivamente. La evaluación de las muestras en, y en torno de, las 0.3 UI por ambos métodos muestran que, en la práctica, un título CIE de 1:4 cumpliría con un mínimo de potencia de la prueba NIH. Un bajo grado de variabilidad de la prueba CIE fue observada en nuestro laboratorio cuando dos lotes de vacunas de referencia de trabajo y 7 lotes de vacunas antirrábicas, de diferente origen y actividad, fueron ensayadas en cinco pruebas independientes. Todos los títulos se ubicaron dentro de una dilución doble, lo que es indicativo de su reproducibilidad. Se observó buena sensibilidad para detectar el deterioro del antígeno en el ensayo de degradación térmica, cuando muestras de 3 lotes de vacuna líquida de cerebro de ratón lactante fueron mantenidas a4 y 37ºC cada una, por 28 días. Se evaluaron semanalmente por los ensayos de CIE y NIH. Finalmente, se observó que el ensayo de CIE podría ser utilizado por los productores para estimar el punto final de los procesos de concentración para que se corresponda con un valor antigénico deseado en la prueba de potencia NIH.The method recommended by the World Health Organization (WHO for the potency assay of human and animal rabies vaccines as final product is the NIH test. Some in vitro techniques have been proposed for in process testing and supplement the in vivo test mentioned above. This paper presents the results obtained when using a counterimmunoelectrophoresis (CIE techniques to determine the antigens content in samples of 84 and 40 samples of lots of suckling mouse rabies and tissue culture rabies vaccines, respectively. The evaluation of rabies vaccines under, at, near and up to 0.3 UI by the NIH and CIE tests showed that for practical use, a CIE titer of 1:4 would match the minimum of NIH potency test requirement. Low degree of CIE test variability within our laboratory was observed, when two working reference and 7 lots of rabies vaccines from different origin and activity were tested in five independent assays. All titres fell within one double dilution what is an indication of its reproducibility. Good sensitivity to detect antigen deterioration in thermal degradation test was observed when samples of 3 lots of liquid suckling mouse rabies vaccine were held stored at 4ºC or at 37ºC for 4 weeks and assays by CIE and NIH tests. Finally, CIE test could apply by manufactures to follow the concentration procedures to determine the final end point which could match a desired antigenic value in the NIH potency test.

  9. EVALUACION DE LA RESISTENCIA A LA CORROSION DEL SISTEMA PRIMER EPOXICO RICO EN ZINC/ACABADO POLISILOXANO POR MEDIO DE ESPECTROSCOPIA DE IMPEDANCIA ELECTROQUIMICA

    National Research Council Canada - National Science Library

    ANDRES ALBERTO GUZMAN ROSAS; LUZ MARINA OCAMPO C

    2011-01-01

    .... Las probetas bajo estudio se evaluaron cada 20 dias por medio de espectroscopia de impedancia electroquimica y al final de la prueba se realizaron chequeos visuales y microscopia optica para ver...

  10. EVALUACION DE LA RESISTENCIA A LA CORROSION DEL SISTEMA PRIMER EPOXICO RICO EN ZINC/ACABADO POLISILOXANO POR MEDIO DE ESPECTROSCOPIA DE IMPEDANCIA ELECTROQUIMICA

    Directory of Open Access Journals (Sweden)

    ANDRES ALBERTO GUZMAN ROSAS

    2011-01-01

    Full Text Available En este trabajo fue estudiado el sistema primer epoxico rico en zinc / acabado polisiloxano aplicado sobre laminas de acero al carbono laminado en caliente y sometido a camaras de corrosion acelerada (inmersion total, niebla salina, ciclo de corrosion y prohesion por un periodo de hasta 5000 horas. Las probetas bajo estudio se evaluaron cada 20 dias por medio de espectroscopia de impedancia electroquimica y al final de la prueba se realizaron chequeos visuales y microscopia optica para ver la morfologia de la interface metal-recubrimiento y microespectroscopia Raman para identificar la presencia de posibles productos de corrosion. Los resultados de impedancia fueron simulados por medio de circuitos electricos equivalentes. Para el sistema se encontraron modulos de impedancia del orden de 1011 ¿.cm2 en prohesion, 1010 ¿.cm2 en ciclo de corrosion, 109 ¿.cm2 tanto niebla salina como en las inmersiones totales (NaCl 10-2M y Na2SO4 10-2M. Este sistema tuvo durante el tiempo de pruebas un comportamiento excelente con altas resistencias de pelicula y de transferencia de carga y bajas capacitancias de pelicula y de doble capa.

  11. Assessment of exposure to scattered radiation in interventional procedures using special protective bismuth; Evaluacion de la exposicion a radiacion dispersa en procedimientos intervencionistas usando protectores especiales de bismuto

    Energy Technology Data Exchange (ETDEWEB)

    Soto Bua, M.; Medina Jimenez, E.; Vazquez Vazquez, R.; Santamaria Vazquez, F.; Otero Martinez, C.; Lobato Busto, R.; Luna Vega, V.; Mosquera Suero, J.; Sanchez Garcia, M.; Pombar Camean, M.

    2011-07-01

    There are currently marketed specific producta aimed at reducing personnel exposure to radiation scattered in cardiac catheterization procedures, interventional radiology or electrophysiology. Our service has been proposed to study the attenuation characteristics of the product Drape Armour manufactured by the company Microtek. Is a flexible devices constructed from an alloy of bismuth and sterility characteristics and infection control and fluid makes them particularly suitable for incorporating into the operative field of the patient. To study their behavior, there have been staff dose measurements representative of the moaL common situations of exposure to scattered radiation in a typical procedure of intervention.

  12. Evaluacion comparativa de dos tipos de muestreo en chucheca (Grandiarca grandis) y piangua (Anadara tuberculosa), en el Golfo de Nicoya, Costa Rica (ING)

    OpenAIRE

    Bolaños Montero, Juan

    2016-01-01

    A comparative study was carried out in order to test the statistic goodness of two sampling methods, working with mollusks in the mangrove ecosystem. Stratified random sampling proved to be better than unrestrained random sampling. Se realizó un estudio comparativo para probar la bondad estadística de dos métodos de muestreo de moluscos en el ecosistema de manglar. El muestreo por estratos resultó ser mejor que el muestreo irrestricto al azar.

  13. Evaluacion comparativa de dos tipos de muestreo en chucheca (Grandiarca grandis) y piangua (Anadara tuberculosa), en el Golfo de Nicoya, Costa Rica (ING)

    OpenAIRE

    Juan Bolaños Montero

    2016-01-01

    Se realizó un estudio comparativo para probar la bondad estadística de dos métodos de muestreo de moluscos en el ecosistema de manglar. El muestreo por estratos resultó ser mejor que el muestreo irrestricto al azar.

  14. Handling of indicators in the evaluation of the medical monitoring in workers occupational exposed; Manejo de indicadores en la evaluacion de la vigilancia medica en trabajadores ocupacionalmente expuestos

    Energy Technology Data Exchange (ETDEWEB)

    Frometa Suarez, Ileana; Lopez Pumar, Georgina Maritza [Instituto Nacional salud de los Trabajadores, La Habana (Cuba)

    2001-07-01

    The present time the medical surveillance of exposed workers is an active surveillance of the adverse effect associated with radiation exposure. The purpose of this paper is to propose indices of the effectiveness and effect of the occupational service and activity from evaluation of the medical surveillance. (author)

  15. Aplicacion de una prueba objetiva conductual de evaluacion de la influencia de los otros en el rendimiento en fútbol

    OpenAIRE

    De la Vega Marcos, Ricardo; Ruiz Barquín, Roberto; Fuentealba Caro, María A.; Ortín Montero, Francisco José

    2012-01-01

    Se presenta el desarrollo de una prueba objetiva basada en el uso de un dinamómetro manual para analizar la influencia que ejerce la presencia de otras personas significativas, como el entrenador o los compañeros, en jugadores de fútbol infantil, cadete y juvenil de la Comunidad Autónoma de Madrid. Su aplicación permite superar las limitaciones presentadas por las pruebas de autoinforme tradicionales, analizando la validez convergente que tienen los resultados obtenidos con los encontrados...

  16. Process for evaluation of renewal of the operating permit for Garona NPP.; Proceso para la evaluacion de la renovacion de la autorizacion de explotacion de Garona

    Energy Technology Data Exchange (ETDEWEB)

    Zarzuela Jimenez, J.

    2009-07-01

    Process for evaluation of renewal of the operating permit for Garona NPP. The Santa Maria de Garona nuclear power plant has requested the renewal of its operating permit for a period of ten years, this implying extension of the operating lifetime of the facility beyond the 40 years originally established. This article explains the process of evaluation that the CN is carrying out in order to draw up a report on the technical feasibility of this proposal. (Author)

  17. Evaluation of solar energy resources in areas with complex topography; Evaluacion de los recursos energeticos solares en zonas de topografia compleja

    Energy Technology Data Exchange (ETDEWEB)

    Batlles, F. J.; Martinez-Durban, M.; Miralles, I.; Ortega, R.; Barbero, F. J.; Lopez, G.; Tovar, J.; Puzo, D.

    2004-07-01

    On a local scale, topography is the main factor affecting the solar radiation reaching the ground. Topographical characteristics of the ground surface may give rise to higher local gradients of insolation. In this work, daily global radiation is estimated under cloudless skies in sites with complex topography. For that, a solar radiation model is used along with a digital elevation model of 20x20 m. Measurements of global radiation recorded at 14 stations located at the Northern face of the Natural Park in Sierra Nevada (Spain) during two years are available. Each radiometric station presents different topographical conditions. This allows to study the topographical influence on the solar radiation budget as well as developing of maps of global, direct and diffuse solar radiation. (Author)

  18. Evaluacion del efecto de diferentes cepas de levadura y clarificantes sobre los atributos sensoriales del vino de naranja criolla (Citrus sinensis)

    National Research Council Canada - National Science Library

    Olivero, Rafael E; Aguas M., Yelitza; Cury R. Katia

    2011-01-01

    .... En una prueba de ordenamiento para determinar el mejor tratamiento de clarificacion se determino que la gelatina por si sola no causa efecto sobre el atributo apariencia general, la combinacion...

  19. PET-CT in the evaluation of sarcomas of soft tissues; PET-CT en la evaluacion de sarcomas de tejidos blandos

    Energy Technology Data Exchange (ETDEWEB)

    Serna M, J.A.; Quiroz C, O.; Sanchez C, N.; Diaz V, G. [Hospital Angeles del Pedregal, Mexico D.F. (Mexico)

    2007-07-01

    {sup 18} F-FDG PET-CT is an image modality of great utility in the evaluation of primary or recurrent lesions of soft tissues. It is necessary to determine the cost-benefit of the different image modalities, although one waits that by means of a better diagnostic, statification and the determination of the grade of malignancy, the PET-CT nowadays can reduce the cost and the complications of the invasive diagnostic methods. (Author)

  20. Radiological impact assessment of arc welding supplies rutile; Evaluacion del impacto radiologico de la soldadura por arco con consumibles de rutilo

    Energy Technology Data Exchange (ETDEWEB)

    Rozas Guinea, S.; Herranz Soler, M.; Perez Marin, C.; Idoeta Hermandorena, R.; Alegria gutierrez, N.; Nunez-Lagos Rogla, R.; Legarda Ibanez, F.

    2013-07-01

    Consumables for welding containing rutile, the coating of the electrode or the filling of tubular thread, are the most widely used and also the most radioactive since the rutile is a mineral containing traces of natural radionuclides, and is therefore considered Normal Occurring Radioactive Material (NORM). As these electrodes and wire are consumed, small particles, aerosols and gases are emitted to the atmosphere of work, and may be inhaled by the welder. Therefore, and also according to the current regulatory framework and work carried out previously by the author on the radiological impact of the process of manufacture and storage of coated rutile electrodes, the objectives are: 1Calcular the internal dose for inhalation during two types of welding, one with electrodes coated and the other with thread. 2 calculate the external dose due to the deposition of particles in the work environment, slag and the immersion of the soldering iron in the cloud of smoke. 3 to assess the radiological impact. (Author)

  1. Scenarios for the hierarchical evaluation of the global sustainability of electric generator plants; Escenarios para la evaluacion jerarquica de la sustentabilidad global de plantas generadoras de electricidad

    Energy Technology Data Exchange (ETDEWEB)

    Roldan A, M.C.; Martinez F, M. [Centro de Investigacion en Energia, UNAM, A.P. 34, 62580 Temixco, Morelos (Mexico)]. e-mail: mcra@cie.unam.mx

    2007-07-01

    The AHP multi criteria method was applied (Analytic Hierarchy Process-Analytic process of Hierarchization) to evaluate the sustainability in the whole life cycle of the electricity generation technologies (hydroelectric, carboelectric, thermoelectric natural fuel oil, natural gas thermoelectric, geothermal, nucleo electric, wind electric, photo thermic and photovoltaic) with the purpose of offering an useful method in the taking of decisions to impel the sustainable development. Eight scenarios are analyzed. The results in most of the scenarios reflect the benefit of the renewable energy: the hydroelectric energy, photo thermic and wind driven its are those more sustainable. To reach the sustainable development in Mexico, the energy politicians should be more near to the use of the renewable energy. (Author)

  2. Numerical and experimental simulation of mechanical and microstructural transformations in Batch annealing steels; Evaluacion numerical y experimental de las transformaciones mecanicas y microestrurales en aceros recocidos Batch

    Energy Technology Data Exchange (ETDEWEB)

    Monsalve, A.; Artigas, A.; Celentano, D.; Melendez, F.

    2004-07-01

    The heating and cooling curves during batch annealing process of low carbon steel have been modeled using the finite element technique. This has allowed to predict the transient thermal profile for every point of the annealed coils, particularly for the hottest and coldest ones. Through experimental measurements, the results have been adequately validated since a good agreement has been found between experimental values and those predicted by the model. Moreover, an Avrami recrystallization model. Moreover, and Avrami recrystallization model has been coupled to this thermal balance computation. Interrupted annealing experiments have been made by measuring the recrystallized fraction on the extreme points of the coil foe different times. These data gave the possibility to validate the developed recrystallization model through a reasonably good numerical-experimental fittings. (Author) 6 refs.

  3. Evaluacion tecno-económica de la producción de biocombustibles a partir de microalgas = techno-economic assessment of biofuel production from microalgae

    OpenAIRE

    Jaramillo Obando, Juan Jacobo

    2011-01-01

    La finalidad de este trabajo de tesis fue estudiar la producción de biodiesel y bioetanol a partir de microalgas ricas en aceite y almidón a bajo costo. Todo esto respetando la tierra cultivable para alimentos, siendo amigable con el ambiente. A lo largo de esta propuesta se muestran técnicas de cultivo de biomasa de microalgas en sistemas abiertos y cerrados, métodos de recolección, extracción de metabolitos y dos caminos para la obtención de biocombustibles, al caso, etanol y biodiesel....

  4. Evaluation of avoided carbon dioxide emissions in cogeneration projects; Evaluacion de las emisiones evitadas de bioxido de carbono en proyectos de cogeneracion

    Energy Technology Data Exchange (ETDEWEB)

    Flores Zamudio, Jesus Antonio; Fernandez Montiel, Manuel Francisco; Alcaraz Calderon, Agustin Moises [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)]. E-mail: jesus.flores@iie.org.mx; mffm@iie.org.mx; malcaraz@iie.org.mx

    2010-11-15

    In this paper, presents a methodology of how to calculate the emissions of CO{sub 2} (Carbon Dioxide) in cogeneration of plants for evaluate future cases with the type of fuel and fuel flow used in the plant. The methodology was in spreadsheets developed a series of stoichiometric balances. The methodology was done for three types of fossil fuels: solid, liquid and gas. The analysis is made only to the percentages of the items contained in the fuel flow automatically used and results in the combustion products in tons per hour. This method was compared with the results obtained in the software Thermoflow Inc. (Used in Gerencia de Procesos Termicos of Instituto de Investigaciones Electricas for evaluate various process systems that produce energy power) using different cogeneration systems, that is to say about the technology used emissions compared according to the amount of excess air for each type of technology and at one point before the gas cleaning systems. The results can be evaluated for emissions avoided through the fuel type used and developing a cogeneration plant compared to a conventional plant. [Spanish] En este articulo, se presenta una metodologia de como calcular las emisiones de CO{sub 2} (Bioxido de carbono) en plantas de cogeneracion, para evaluar casos a futuro por medio del tipo de combustible y flujo de combustible a utilizar en la planta. La metodologia se realizo en hojas de calculo, donde se desarrollaron una serie de balances estequiometricos. La metodologia se hizo para tres tipos de combustibles fosiles: solido, liquido y gas. El analisis se realiza con solo dar los porcentajes de los elementos que contiene el combustible y el flujo a utilizarse y automaticamente da como resultado los productos de la combustion en toneladas por hora. Esta metodologia se comparo con los resultados obtenidos en el software Thermoflow Inc. (Empleado en la Gerencia de Procesos Termicos del Instituto de Investigaciones Electricas para evaluar diversos sistemas de vapor a proceso que produzcan energia electrica) utilizando diferentes sistemas para cogenerar, es decir respecto a la tecnologia utilizada se comparo las emisiones de acuerdo a la cantidad de exceso de aire para cada tipo de tecnologia y en un punto antes de los sistemas de limpieza de gases. Los resultados se analizan para saber las emisiones que se evitarian con el tipo combustible a utilizar y desarrollando una planta de cogeneracion en comparacion con una planta convencional.

  5. Synthesis and evaluation of polystyrene membranes for use in fuel cells; Sintesis y evaluacion de membranas base poliestireno para uso en celdas a combustible

    Energy Technology Data Exchange (ETDEWEB)

    Benavides, R. [Centro de Investigacion en Quimica Aplicada (CIQA), Saltillo, Coahuila (Mexico)] e-mail: robertob@ciqa.mx; Paula, M.M.S.; Da Silva, L.; Fiori, M.; Coronetti, J.C.; Silvano, W.F. [Lasicom, Universidade do Extremos Sul Catarinense (UNESC), Criciuma, S.C. (Brasil); B.M. Huerta [Centro de Investigacion en Quimica Aplicada (CIQA), Saltillo, Coahuila (Mexico)

    2009-09-15

    Polymeric membranes were prepared using mass copolymerization of acrylic/styrene with weight proportions of 90/10, 92/8 and 94/6 %, while using the cross-linked divinylbenzene (DVB) monomer with weight proportions of 0.1 and 0.001 % to improve the mechanical properties. The copolymers obtained were sulfonates with sulfuric acid concentrated for 0, 30, 85 and 120 minutes to improve its ionic exchange capacity. The materials were characterized using infrared spectroscopy, thermal analysis (TGA and DSC), cross-linked level with% Gel and acidity using titration with sodium hydroxide. The IR spectrum of the membranes before sulfonating shows the existence of traditional polymer bands used with two signals from homopolymers that are lost and two new signals appearing, corroborating the copolymerization reactions. The thermogravimetry shows a higher decomposition temperature for the cross-linked DVB membranes, while the DSC is not very useful for observing transitions due to the hygroscopicity of the membranes. Finally, the percentage of gel is related to the amount of DVB used and the acidity of the membranes increases with increasing amounts of acrylic acid, sulfonation time and DVB percentage, although this value depends a good deal on the ease of solubilizing the material. The ionic properties of the membranes with better mechanical properties were evaluated with a fuel cell prototype. [Spanish] Se prepararon membranas polimericas mediante la copolimerizacion en masa del estireno/acido acrilico en proporciones de 90/10, 92/8 y 94/6 % en peso, al mismo tiempo que se utilizo el monomero entrecruzante divinilbenceno (DVB) en proporciones de 0.1 y 0.001 % en peso, para mejorar sus propiedades mecanicas. Los copolimeros obtenidos fueron sulfonados con acido sulfurico concentrado durante periodos de tiempo de 0, 30, 85 y 120 minutos para mejorar su capacidad de intercambio ionico. Se caracterizaron los materiales mediante espectroscopia infraroja, analisis termicos (TGA y DSC), nivel de entrecruzamiento mediante % Gel y funcion acida mediante titulacion con hidroxido de sodio. Los espectros IR de las membranas antes de sulfonar muestran la existencia de bandas tradicionales de los polimeros utilizados con dos senales de los homopolimeros que se pierden y dos nuevas que aparecen, corroborando las reacciones de copolimerizacion. La termogravimetria muestra una temperatura de descomposicion mayor para las membranas entrecruzadas con el DVB, mientras que el DSC no es muy util para observar transiciones debido a la higroscopicidad de las membranas. Finalmente, el porcentaje de gel esta efectivamente relacionado con la cantidad de DVB utilizado y la acidez de las membranas es mayor con el contenido de acido acrilico, con el tiempo de sulfonacion y el porcentaje de DVB; aunque este valor depende mucho de la facilidad de solubilizar el material. Las propiedades ionicas de las membranas con mejores propiedades mecanicas fueron evaluadas en un prototipo de celda a combustible.

  6. Construction and evaluation of a fuel cell prototype (proton exchange fuel cell); Construccion y evaluacion de un prototipo de celda a combustible (proton exchange fuel cell)

    Energy Technology Data Exchange (ETDEWEB)

    Da Silva, L. [Laboratorio de Pesquisa em Energia - LAPEN, Universidade do Vale do Itajai, São Jose, SC (Brasil)] e-mail: luciano.silva@univali.br; Paula, M.M.S.; Fiori, M [Lasicom, Universidade do Extremos Sul Catarinense (UNESC), Criciuma, S.C. (Brasil); Benavides, R. [Centro de Investigacion en Quimica Aplicada (CIQA), Saltillo, Coahuila (Mexico); Santos, V. [Laboratorio de Pesquisa em Energia - LAPEN, Universidade do Vale do Itajai, São Jose, SC (Brasil)

    2009-09-15

    Because electric energy is a vitally important material for the development of the country, this work is aimed at offering an alternative methodology for the construction and operational demonstration of a PEMFC fuel cell. Recently discovered natural gas reserves can be exploited using modern methods and its use fulfills generation, distribution and low environmental impact priorities. All these factors can be observed with the use of fuel cells, especially when working with reformed natural gas. In addition to its low environmental impact during the generation of this energy, the use of fuel cells reflects a generator source that can be located with the consumer, further reducing problems created by transmission lines, fuel transport, etc. Fuel cells are receiving a great deal of attention from the international community and some models are already commercially available. They are showing excellent possibilities for becoming one of the future technologies to generate electric energy with low environmental impact. [Spanish] En funcion de la necesidad de energia electrica como insumo de vital importancia para el desarrollo del pais, este trabajo pretende ofrecer una metodologia alternativa para la construccion y demostracion operacional de una celda a combustible del tipo PEMFC. La explotacion de las reservas de gas natural descubiertas recientemente puede realizarse a traves de metodos modernos y su uso tiene las prioridades de generacion, distribucion y bajo impacto ambiental. Todos estos aspectos se pueden observar dentro del uso de celdas a combustible, especialmente cuando se trabaja con gas natural reformado. Ademas del factor de bajo impacto ambiental durante la misma generacion de energia, el uso de las celdas a combustible involucra una fuente generadora, que puede colocarse junto al consumidor, reduciendo aun mas los problemas generados por las lineas de transmision, el transporte del combustible, etc. Las celdas a combustible estan recibiendo una gran atencion en la comunidad internacional y algunos modelos ya estan disponibles en la etapa comercial; estas estan mostrando posibilidades excelentes de convertirse en una de las tecnologias futuras para la generacion de energia electrica con bajo impacto ambiental.

  7. Evaluation of the degradation of the service water system in nuclear plants; Evaluacion de la degradacion del sistema de agua de servicio en plantas nucleares

    Energy Technology Data Exchange (ETDEWEB)

    Salaices A, E. [IIE, Av. Reforma 113, Col. Palmira, Cuernavaca, Morelos (Mexico)

    2003-07-01

    The service water system, the circulation water system, the cooling water system and the protection against fires system so much in nuclear plants as in fossils plants they are being degraded by a wide variety of mechanisms. These mechanisms include microbiologically influenced corrosion, cavitation, erosion-corrosion, erosion by solid particles, corrosion in cracks, stings, general corrosion, galvanic corrosion, sedimentation and obstructions and incrustations in the heat exchangers. In the last years were developed predictive models for the more common degradation forms and were installed in a new application of the CHECWORKS{sup TM} code called Cooling Water Application (CWA). This application of the code provides a new technology that so much nuclear facilities as fossil ones can use to modelling specific systems and to carry out corrosion predictions in each one of its components. Presently work the results of the employment of the CHECWORKS CWA code are described to carry out predictions of 12 different corrosion mechanisms that affect to the service water system of a nuclear plant, as well as the recommendations and options that the plant can to consider to reduce indexes of damages. This work can be used for to optimize inspections to the service water system and it gives the bases for similar changes in other nuclear plants. (Author)

  8. Evaluation of the weekly quality control of a digital mammography machine; Evaluacion del control de calidad semanal de un mamografo digital

    Energy Technology Data Exchange (ETDEWEB)

    Angulo Pain, E.; Ramos Caballero, L. J.; Urena Llinares, A.; Iborra Oquendo, M. A.; Quinones Rodriguez, L. A.; Castro Ramirez, I.; Gonzalez Aquino, P.; Aguirre Huelga, M. J.

    2013-07-01

    In the new edition of the PCCRD (2011) has been established as weekly quality control testing for digital mammography equipment the analysis of artifacts from the team and defective items in the DR, the constancy of the functioning of the CAE, the accuracy of the thickness determined by the compression system, constancy in the uniformity and quality of the image. The objective of the study is to evaluate data collected during the first year of operation of the equipment. (Author)

  9. DISEÑO Y SINTESIS DE SONDAS FLUORESCENTES SELECTIVAS PARA FE Y EVALUACION DE SU ACTIVIDAD IN VITRO EN LINEAS CELULARES

    OpenAIRE

    GARCIA BELTRAN, OLIMPO JOSE

    2012-01-01

    El hierro está ampliamente distribuido en la naturaleza y es uno de los más importantes elementos en sistemas biológicos. Este juega un rol en muchos procesos bioquímicos a nivel celular tales como la formación de la hemoglobina en eritrocitos y en el depósito y transporte de oxígeno a los tejidos. También es indispensable para muchos organismos y tanto su deficiencia como su acumulación excesiva pueden inducir varios desórdenes como anemia, cáncer de hígado y riñones, cirrosis...

  10. ¿Son las TIC un factor clave en la adquisición de competencias? Un análisis con evaluaciones por ordenador

    OpenAIRE

    Mauro Mediavilla; Josep Oriol Escardíbul

    2015-01-01

    Este artículo analiza los efectos de la tenencia y uso de las tecnologías de la información y la comunicación (TIC) en la adquisición de competencias (evaluadas por ordenador en la prueba de PISA de 2012). Los principales resultados son los siguientes. En primer lugar, se constata que las variables TIC inciden en mayor medida en la adquisición de matemáticas que en el resto de competencias evaluadas (comprensión lectora y ciencias). En segundo lugar, resulta relevante la variable TIC utilizad...

  11. Evaluacion de la eficiencia de una bateria de filtros empacados en zeolita en la remocion de metales pesados presentes en un licor mixto bajo condiciones de laboratorio

    National Research Council Canada - National Science Library

    Acevedo Cifuentes, Diana Rocio; Builes Felizzola, Sandra Milena; Ordonez Ante, Carlos Andres; Lopez Sanchez, Idalia Jacqueline

    2011-01-01

    En este articulo se muestran resultados de investigacion obtenidos en la remocion de los metales pesados, plomo, niquel, cromo, cadmio y mercurio, presentes en una solucion compuesta por licor mixto...

  12. EARTH MICRO-COSMOS. A technique to evaluate the effect produce by pollutants; MICROCOSMOS TERRESTRE. Una tecnica para la evaluacion de los efectos producidos por los contaminantes

    Energy Technology Data Exchange (ETDEWEB)

    Sanchez Gimeno, B.; Sanchez Cabrero, B.; Varela Gonzalez, J.

    1987-07-01

    Chemical pollution is one of the risks of industrialization. Daily there emerge a great deal of chemical compounds and it is necessary to asses the risk they might suppose to the environmental and/or human health. Till recently, the toxicity tests of the chemicals or their transformation products, were carried out using individuals of a few species. This approach doesn't seem correct because it ignores the relations that are stablished at the ecosystem level. Microcosms pretend to be an adecuated tool for the ecotoxicologicals tests. This review presents two different parts: in the first one, we show the possible applications of microcosms, in the second one, we present the validation and evaluation of the soil core microcosm, following the works done by EPRI and EPA. It would be interesting to assess and validate the soil core microcosm using it with fumigation of atmospheric pollutant in controlled environment and subsequently compare the results obtained in the laboratory with those obtained in the field. We think that this approach, along with other, techniques, may be useful. (Author) 37 refs.

  13. Control and evaluation methodology of reclaimed surfaces in coal mines; Metodologia para el Seguimiento y Evaluacion de Superficies Restauradas en Minas de Carbon

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2000-07-01

    The objective of the project has been to establish a control and evaluation methodology of reclaimed surfaces in coal mines, ash dumps,... etc. to be applied especially in locations with limited availability of ton soil, and to be used by mining companies to establish an internal quality control of the reclamation carried out. This methodology has been developed based on the evaluation of the results obtained from the reclamation that Endesa carries out at the Puentes mine. An operating and simplified method which may be adopted by smaller sites has been developed. This project has been carried out during the period 1994-1996 and includes a study about the physicochemical conditions of reclaimed surfaces, soil organisms study and about vegetation productivity associated to micorrizae. The conclusions and recommendations obtained include reclamation techniques (study and management of the deposit dumped, top soil management, addition of basic correctors, fertilization, top soil and maintenance works) and reclaimed surface control techniques (physicochemical soil conditions, soil organisms and vegetation). (Author)

  14. Safety assessment of nuclear medicine practice using the Risk Matrix Method; Evaluaciones de seguridad de la practica de medicina nuclear utilizando el metodo de Matrices de Riesgo

    Energy Technology Data Exchange (ETDEWEB)

    Cruz, Dumenigo; Cruz, Yoanis; Soler, Karen, E-mail: cruz@orasen.co.cu [Centro Nacional de Seguridad Nuclear (CNSN), La Habana (Cuba); Guerrero, Mayka, E-mail: mayka@infomed.sld.cu [Centro de investigaciones Medico Quirurgicas (CIMEQ), La Habana (Cuba)

    2013-10-01

    This paper presents the main results from the application of the methodology of Risk Matrices in a hypothetical service / department of the Nuclear medicine that realize metabolic radiotherapy treatment and diagnostic studies with {sup 131}I and {sup 99} m Tc and {sup 18}F. We could identify major equipment failures and human errors that could potentially lead to a accident in practice. For each analyzed initiating events evaluated the frequency of occurrence, identified key existing defenses to avoid the accident and assessed the potential consequences of an accident if this comes to fruition. With this methodology we could identify which accident sequences increased risk and to propose means to reduce the risk in such cases. As a result of this work was developed the 'RMA Nuclear Medicine' computer tools that will apply this methodology in nuclear medicine services that need to do similar risk assessments.

  15. Evaluation of doses received by pediatric and adult patients undergoing to CT exams; Evaluacion de la dosis recibida por pacientes adultos y pediatricos en examenes de tomografia computarizada

    Energy Technology Data Exchange (ETDEWEB)

    Lavie, Maria F. Jimenez; Tejeda, Adalberto Machado, E-mail: felicia@cceem.sld.cu, E-mail: adalberto@cceem.sld.cu [Centro para el Control Estatal de Medicamentos, Equipos y Dispositivos Medicos (CECMED), La Habana (Cuba); Otano, Anisia; Zuniga, Dora Maya [Hospital Pediatrico Centro Habana (Cuba); Perdomo, Jorge Hing; Rodriguez, Gustavo Guadarrama [Hospital Docente Clinico Quirurgico Freyre Andrade, La Habana (Cuba)

    2013-07-01

    This paper aims to evaluated the dose to adult and pediatric patients due to the execution of tests CT scan of head, chest and abdomen, as well as establish a comparative analysis between these results and protocols involving employees to begin a process optimization in the practice.

  16. Evaluacion nutricional, deficiencia de micronutrientes y anemia en adolescentes femeninas de una zona urbana y una rural del estado Zulia, Venezuela

    National Research Council Canada - National Science Library

    Ortega, Pablo; Leal, Jorymar; Amaya, Daysi; Chavez, Carlos

    2010-01-01

    ...) y Deficiencia de Vitamina A (DVA) en adolescentes femeninas no gestantes, de baja condicion socioeconomica de una zona urbana y una rural del Estado Zulia-Venezuela, se estudiaron 78 adolescentes femeninas (15,9 [+ o -] 1,1 anos...

  17. Evaluation of the technique `wire on the screw` in laboratory accelerated essays; Evaluacion de la tecnica de `alambre sobre tornillo` en ensayos acelerados de laboratorio

    Energy Technology Data Exchange (ETDEWEB)

    Calderon, J.; Arroyave, C. [Grupo de Corrosion y Proteccion, Universidad de Antioquia, A.A. 1226, Medellin, Colombia (Colombia)

    1998-12-31

    The CLIMAT essay has been employed as for the micro climate corrosiveness determination as for large geographic zones, allowing the qualification of corrosiveness of the interesting sites, the maps raising, the materials evaluation and the pollution focus localization. However, its utility, this has not been deepen in the understanding of his characteristics and corrosive process that it experiments. With the purpose in order to deepen in its knowledge and evaluating the useful possibilities in an immersion-emersion accelerated essay, it was accomplishment the present work. For this, was employed spiral aluminium manometers forming a galvanized pair with copper and steel screws, which were exposed to representative dissolutions of rainwater of the rural, urban and marine environment. It was measured the electrode potential for the essays, the corrosion velocities were determined gravimetrically, it was drawing polarization curves and they were characterized the corrosion products by X-ray diffraction (XRD), Infrared spectrometry (Ftir), Scanning Electron Microscopy (Sem) and stereoscopic microscope. The results allow to conclude that must pass sometime for what galvanic action was established. The potential evolution after that initial time, is approximately the same for the two pairs, for which the main losing of mass obtained in the Al-Cu screw has to be explained with kinetic arguments offered for polarization curves. The main corrosion product is bayerite (Al(OH){sub 3}), with greater crystallinity in Cl{sup -} dissolution than in SO{sub 4} {sup (2-)} and with morphologies very influenced by environment. (Author)

  18. Evaluation of customer satisfaction as a tool for monitoring and improving management; Evaluacion de la satisfaccion del cliente como herramienta de control y mejora de la gestion

    Energy Technology Data Exchange (ETDEWEB)

    Vazquez, R.; Barbosa, A.

    2006-07-01

    This article seeks to determine the degree of customer satisfaction with the supply and treatment services provided by a manager of the urban water cycle (in this case Emalcsa). It summarises a methodology designed to overcome resistance to change and biased opinions, and to be able to detect small changes of attitude in society which would be hard for the usual mechanisms to pick up due to the special circumstance of this activity. In order to assess whether the strategies used by the manager are correct, various different methodologies, such as planned surveys, opinion polls and regression tools, were employed. The aim of al this was to achieve user satisfaction with the service and the way it is delivered. (Author)

  19. Evaluation of Agricultural Use of Vicia sativa L. in Mercury Contaminated Soils; Evaluacion del Uso Agricola de Vicia sativa L. en Suelos Contaminados con Mercurio

    Energy Technology Data Exchange (ETDEWEB)

    Andres, A.; Millan, R.; Esteban, E.

    2010-03-08

    This study is framed in the project Recuperation de suelos contaminados por mercurio: recomendaciones de uso de suelos y plantas en la comarca minera de Almaden (REUSA), funded by Spanish Ministry of Education and Science. Moreover, this article is the result of the work carried out by Andres Andres for his Bachelors dissertation. Soils from the Almaden mining district are contaminated with high mercury concentrations, due to the extraction activities of that metal through the years. After the end of mining exploitation, which was the main source of wealth in the region, alternative uses of soils are needed in order to promote the socio-economic development of the studied area. The project here intends to evaluate the viability of the common vetch (Vicia sativa L.) crop in a substrate under similar conditions to the ones observed in the Almaden soils, by studying the mercury absorption capacity of the above mentioned species. (Author) 20 refs.

  20. Vibration analysis and online thermodynamic assessment of a turbo-blower turbine; Analisis de vibraciones y evaluacion termodinamica en linea de la turbina de un turbosoplador

    Energy Technology Data Exchange (ETDEWEB)

    Munoz Q, Rodolfo; Marino L, Carlos; Ramirez S, Jose A.; Rivera G, Juan J. [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2007-11-15

    In this paper are presented the results of the analysis of dynamic and thermodynamic behavior analysis of a turbo-blower integrated by one 13,080 KW steam turbine and a blower with a flow of 131,520 ft{sup 3}/m, to determine the cause of the excessive wearing of the axial trust bearing of the steam turbine. The main cause of failure is the wearing and severe dirtiness of the turbine stages that contributes with an increment of the turbine axial load. The consequences of the turbine deterioration are: greater axial load due to the additional heating rotor (requires greater steam to generate the same power that in design conditions); turbine motive power reduction and the reduction of isentropic efficiency of the same, for similar average steam consumption between reference and test. Due to the former the turbine power represents a deviation of the 34.74% in Steam Specific Consumption (SSC). [Spanish] Se presenta los resultados del analisis del comportamiento dinamico y termodinamico de un turbosoplador integrado por una turbina de vapor de 13,080 KW y un soplador con un caudal de 131,520 pies{sup 3}/m, para determinar la causa del desgaste excesivo de la chumacera de empuje axial de la turbina de vapor. La causa principal de la falla es el desgaste y ensuciamiento severo de las etapas de la turbina que contribuye con un incremento de la carga axial de la turbina. Las consecuencias del deterioro de la turbina son: mayor carga axial debida al calentamiento adicional del rotor (requiere mayor vapor para generar la misma potencia que en condiciones de diseno); reduccion de la potencia motriz de la turbina y de la eficiencia isoentropica de las mismas, para un consumo de vapor promedio similar entre referencia y prueba. Debido a lo anterior la potencia de la turbina representa una desviacion del 34.74% en el Consumo Especifico de Vapor (CVE).

  1. Probabilistic fracture mechanics in the integrity evaluation of components; Mecanica de fractura probabilista en la evaluacion de la integridad de componentes

    Energy Technology Data Exchange (ETDEWEB)

    Franco Nava, Jose Manuel; Torres Toledano, Jose Gerardo; Sanchez Sanchez, Ramon [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1996-12-31

    Because of the importance of fracture mechanics in applications to pressure vessels, piping and other components used in thermal power plants, the Mechanical Engineering Unit of the Instituto de Investigaciones Electricas (IIE) has been developing activities in this field since some years ago. In this paper, the process for the analysis of probabilistic fracture mechanics is described. As an example, an application to the calculation of fault probability in piping systems, is presented. [Espanol] Dada la importancia de la mecanica de fractura en aplicaciones de recipientes a presion, tuberias y otros componentes utilizados en centrales termicas, la Unidad de Ingenieria Mecanica del Instituto de Investigaciones Electricas (IIE) ha venido desarrollando actividades en este campo desde hace algunos anos. En el presente trabajo, se describe el proceso para el analisis de mecanica de fractura probabilista. Como ejemplo se presenta una aplicacion al calculo de probabilidad de falla en tuberias.

  2. Evaluation of fatigue damage in nuclear power plants: evolution and new tools of analysis; Evaluacion del dano a fatiga en centrales nucleares: evolucion y nuevas herramientas de analisis

    Energy Technology Data Exchange (ETDEWEB)

    Cicero, R.; Corchon, F.

    2011-07-01

    This paper presents new fatigue mechanisms requiring analysis, tools developed for evaluation and the latest trends and studies that are currently working in the nuclear field, and allow proper management referring facilities the said degradation mechanism.

  3. POLÍTICAS INDÍGENAS Y CONSTITUCIÓN. Evaluaciones Críticas en Torno a Las Reformas Constitucionales en México: 1992, 2001, 2011

    OpenAIRE

    Michel Duquesnoy

    2011-01-01

    En 1988, al ser electo como presidente de la República Mexicana como término de elecciones debatidas en las que, por primera vez en la historia de esta nación, los electores opositores hicieron correr el riesgo al candidato del partido hegemónico de perder la carrera a la jefatura del ejecutivo, Carlos Salinas de Gortari emprendió una larga serie de reformas del Estado con el objetivo de seguir la promoción de la política neoliberal y facilitar la tecnocracia emprendida con su predecesor, Mig...

  4. The third mission of Spanish Universities. Basic indicator for its evaluation; La tercera mision de la Universidad. Enfoques e indicadores basicos para su evaluacion

    Energy Technology Data Exchange (ETDEWEB)

    Bueno Campos, E.; Casani Fernandez de Navarrete, F.

    2007-07-01

    During the last decade of the XXth century, a new revision movement on the mission of the university in this Knowledge Era has emerged. This movement incorporates to the traditional functions of the University of higher education and research, a third one based on the development of the third mission, organized around three main axes: entrepreneur ship, innovation and social commitment. The justificative analysis, the measurement and the plan to accomplish this new mission successfully is presented as a subject of high importance in the European Union, given the objectives of european universities towards 2020 for a Europe of Knowledge towards Growth. (Author) 49 refs.

  5. Mobil laboratory for the evaluation on site of the power electric equipment, second generation; Laboratorio movil para la evaluacion en sitio del equipo electrico de potencia, segunda generacion

    Energy Technology Data Exchange (ETDEWEB)

    Carrillo C, Jaime; Escorsa M, Oscar; Estrada G, Javier A; Iturbe F, Marlene; Robles P, Edgar [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2005-07-01

    To the interior of the Generation of Electrical Equipment (GEE) of the Instituto de Investigaciones Electricas, one of the main activities is the diagnosis of the electrical equipment in service. It is well known that the power equipment represents a strong investment that requires the guarantee that it has been manufactured, installed and operated satisfactorily. The life expectancy of these devices is of thirty years, however, many of them already have surpassed that expectation. The rehabilitation or substitution of the equipment implies new investments that are needed for an evaluation of the real condition of the equipment to carry out such rehabilitation. One of the tools necessary to carry out the diagnosis, is a movable laboratory that facilitates all the necessary tools to perform a meticulous analysis that would allow, the client, to make high cost decisions. The application of the movable laboratory is advisable from the inauguration of the equipment. The electrical mechanisms are factory tested in accordance with standardized protocols; it guarantees the fulfillment of the necessary requirements for a correct operation. Nevertheless, when taking them to the assembly site, these are subjected to a series of processes and mechanical stresses that could alter the equipment conditions and its integrity. [Spanish] Al interior de la Generacion de Equipos Electricos (GEE) del Instituto de Investigaciones Electricas, una de las principales actividades es el diagnostico del equipo electrico en servicio. Es bien sabido que los equipos de potencia representan una fuerte inversion que requiere la garantia de que se ha fabricado, instalado y operado satisfactoriamente. La esperanza de vida de estos dispositivos es de treinta anos, no obstante, muchos de ellos ya han superado esa expectativa. La rehabilitacion o sustitucion de equipos, implica nuevas inversiones que precisan un conocimiento del estado real del equipo para llevarla a cabo. Una de las herramientas necesarias para efectuar el diagnostico, es un laboratorio movil que facilite todo lo necesario para efectuar un analisis minucioso que permita, al cliente, tomar decisiones de alto costo. La aplicacion del laboratorio movil es conveniente desde la puesta en servicio del equipo. Los mecanismos electricos se prueban en fabrica de acuerdo a protocolos normalizados, ello garantiza el cumplimiento de los requisitos necesarios para una correcta operacion. Sin embargo, al llevarlos al sitio de montaje, estos se ven sometidos a una serie de procesos y esfuerzos mecanicos que pueden alterar las condiciones e integridad del equipo.

  6. Structural evaluation of a prestressed concrete bridge under an alkali-silica reaction; Evaluacion estructural de un puente de hormigon pretensado afectado por una reaccion alcali-silice

    Energy Technology Data Exchange (ETDEWEB)

    Carpintero Garcia, I.; Bermudez Adriozola, B.

    2010-07-01

    The Central Laboratory of Structures and Materials (CEDEX) was commissioned by the National Department of Highways to evaluate the safety conditions of one bridge built on 1997, which is part of the net of the Spanish National Highways. Even at the first inspection many cracks were detected in the concrete deck, associated with expansion concrete processes. This examination revealed that concrete deterioration was not associated with any reinforcement corrosion process; in fact, there were no symptoms of this pathology all along the bridge. for that reason the internal chemical reactions were considered as the most probable cause for the expansion of concrete, as no symptoms of deterioration due to external attack were found. In order to check the origin of concrete expansion, some tests were carried out on concrete samples drilled on the decks. Results of these tests show that there had been internal reactions in concrete mass which explains its expansion and the appearance of those cracks observed. Further more, some other activities were also carried out on site to estimate the importance of the structural damages, as topographic levelling and dynamic testing of the decks. Also the mechanical properties of concrete probes were tested at laboratory. This article shows the main results obtained on the study carried on to determine the cause and significance of the structural damages of the bridge. (Author) 3 refs.

  7. La universidad neoliberal y la crisis educativa.De cómo año tras año llegaron las evaluaciones

    Directory of Open Access Journals (Sweden)

    Jorge Lora Cam

    2003-01-01

    Full Text Available Es importante advertir cómo las instituciones educativas están aplicando políticas reformistas neoliberales para transformarse radicalmente incluyendo las tareas clásicas y básicas de docencia, investigación y difusión de la cultura, por incipientes redes de teleeducación y teleinformación, alimentando más la fantasía del saber que el saber mismo, y agregando nuevos ingredientes a la educación como la exclusión y procesos de selección tomados de modelos norteamericanos. Se articula así una cultura académica con conceptos como productividad, competitividad, calidad, excelencia y evaluación que estimulan el individualismo y atentan contra la colaboración académica, afectando directamente en la construcción de conocimientos. Además de señalar claramente el dispositivo central de poder que es el factor económico, donde se pretende que los sistemas universitarios lleguen a estar determinados por las fuerzas del mercado y que sean controlados tecnocráticamente, degradando la educación con niveles de conocimiento subprimarios en las ciencias y las técnicas. La educación se convierte así en una preparación para la sumisión, mencionando de paso las transformaciones laboral y profesional de los docentes en detrimento del desarrollo y consolidación de los cuerpos académicos.

  8. Evaluation of the open vial method in the radon measurement; Evaluacion del metodo del vial abierto en la medicion de radon

    Energy Technology Data Exchange (ETDEWEB)

    Lopez del Rio, H.; Davila R, J. I.; Mireles G, F., E-mail: hlopezdelrio@hotmail.com [Universidad Autonoma de Zacatecas, Unidad Academica de Estudios Nucleares, Cipres No. 10, Fracc. La Penuela, 98068 Zacatecas (Mexico)

    2014-10-15

    The open vial method is a simple technique, under-utilized but that take advantage of the great radon solubility in organic solvents, therefore applies in the measurement of the radon concentration exhaled in soil. The method consists on the exposition to the gas radon of an open vial with scintillating solution. An integral mathematical model for indoors that describes the emanation processes and gas radon exhalation was developed, as well as the radon dissolution in the scintillation liquid, besides obtaining the characteristic parameters of the experimental system proposed for the radon concentration calculation exhaled by soils. Two experimental arrangements were designed with exposition cameras of 12 and 6 L and quantity of different soil. The open vial was prepared with a mixture of 8 ml of deionized water and 12 ml of scintillation liquid OptiPhase Hi Safe 3 in polyethylene vials; the measurements of the dissolved radon were carried out in scintillation liquid equipment. As a result, on average 2.0% of the exhaled radon is dissolved in the open vial and the dissolved fraction is independent of the experimental arrangement. Also was observed that the exposition time does not affect the radon dissolution significantly, in correspondence with the reported in the literature. (Author)

  9. Representaciones sociales sobre el proceso evaluacion desde la mirada de docentes de 1 ano basico en establecimientos municipalizados urbanos de la comuna de Quilpue

    National Research Council Canada - National Science Library

    Torres, Ana Maria

    2013-01-01

    El presente estudio consiste en una investigacion cualitativa a partir del discurso de un grupo de docentes de 1 Ano Basico sobre las creencias y representaciones sociales en las que basan sus practicas evaluativas...

  10. Voltage stability evaluation facing small disturbances by means of the modal analysis technique; Evaluacion de la estabilidad de voltaje ante disturbios pequenos mediante la tecnica de analisis modal

    Energy Technology Data Exchange (ETDEWEB)

    Leon Rodriguez, Daniel

    2000-12-15

    The economic development of the countries has taken implicit a growing industrialization the one which, joined to those every time bigger resident's necessities, it has caused a constant and progressive increment in the electric power demand. However, in the last years the growth of the electric network of these systems has been more and more limited for diverse such factors as the ecology and the economy, as well as for the social and political costs that implies each new construction in the system. With the presence of these restrictions the electric systems in many cases, have been forced to satisfy the increments in the demand making a more exhaustive use of the infrastructure that they have available and the incorporation of only a few new system elements or constructions. These aspects have caused such systems to operate with more limited security margins and that their stability has to be analyzed in a reliable and precise way. Taking into account the previously mentioned aspects, as the electric systems have had the necessity of operating under forced conditions to satisfy the load demand, voltage stability problems have been presented with more frequency causing serious disturbances and in some cases, total blackouts. With these problems, the voltage stability analysis has taken bigger importance in the studies that the electric utilities carry out. This issue has caused that bigger resources are dedicated for the investigation of this phenomenon with the purpose of understanding and developing tools that allow studying it in a more complete and more truthful way. Modal analysis is one of the most recent and popular steady techniques the one that, from its appearance has had a great peak due to the valuable and quick information that provides, besides its implementation easiness and the little effort computational that it requires. In this work is carried out the voltage stability evaluation of a real electric system applying in a combined way the modal analysis technique with other conventional techniques as the curves P-V and V-Q. It also illustrated the way in that the different information obtained of these techniques is supplemented to achieve a more complete and more representative voltage stability study. Besides analyzing the voltage stability for the normal operation conditions (base case), also are evaluated three different reactive compensation alternatives with the object of improving the margin or distance to the system voltage instability. The results obtained with each one of the compensation options are compared to each other and commented for finally, to propose the alternative that presents the biggest advantages from the voltage stability point of view. The selection of the most appropriate places to locate the reactive compensation is carried out being based on the bus participation factors by the modal analysis for the base case. Finally, taking into account the tools and the procedures used in this work to carry out the voltage stability analysis, one of the main purposes consists on proposing a methodology that allows indicating certain guidelines that help carry out voltage stability studies in a quicker and simpler way. [Spanish] El desarrollo economico de los paises ha llevado implicita una creciente industrializacion la cual, aunada a las cada vez mayores necesidades de sus pobladores, ha provocado un constante y progresivo incremento en la demanda de energia electrica. Sin embargo, en los ultimos anos el crecimiento de la red electrica de estos sistemas se ha visto cada vez mas limitado por diversos factores tales como la ecologia, la economia y por los costos sociales y politicos que cada nueva obra implica. Ante la presencia de estas restricciones los sistemas electricos en muchos casos, se han visto obligados a satisfacer los incrementos en la demanda haciendo un uso mas exhaustivo de la infraestructura que tienen disponible y la incorporacion de solo unas cuantas obras nuevas. Estos aspectos han provocado que dichos sistemas operen con margenes de seguridad mas limitados y qu

  11. Evaluation of quality of quinua seed (Chenopodium quinoa Willd) improved by mutagenesis; Evaluacion de calidad de semilla de quinua (Chenopodium quinoa Willd) mejorada por mutagenesis

    Energy Technology Data Exchange (ETDEWEB)

    Avila R, S.; Reyes G, A. [UAEM, Facultad de Quimica, 50120 Toluca, Estado de Mexico (Mexico); Cruz T, E. De la [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    2004-07-01

    It was carried out the physical and bromatological characterization of the seed of quinua of the varieties Sajama Barandales and Amarilla de Marangani; mutant lines 20R{sub 1}10, 94, 20R{sub 3}33, 20R{sub 2}27, 20R{sub 3}42 and 20R{sub 3}7 as well as of the advanced line obtained by conventional improvement 640304. The evaluated variables were seed size (diameter and thickness in mm), weight in grams of 100 seeds and density in grams by liter, finding that the genotype 20R{sub 3}33 present excellent characteristics respect with these variables. In the bromatological analysis it was determined the percentage of humidity, ashy, raw fiber, ethereal extract, proteins and carbohydrates, highlighting that the genotypes 20R{sub 3}33, 20R{sub 3}42 and witness present good values of protein content (16.8%, 15.57% and 15.9% respectively), overcoming to the cereals (corn, wheat and rice). (Author)

  12. Evaluacion de dos metodos de extraccion de ADN a partir de biopsias fijadas en formalina y embebidas en parafina en condiciones no optimas

    National Research Council Canada - National Science Library

    Bustamante, Javier Andres; Astudillo, Miryam; Pazos, Alvaro Jairo; Bravo, Luis Eduardo

    2011-01-01

    .... Existen multiples metodos de extraccion de ADN a partir de este tipo de muestras. No obstante, la mayoria de metodos toman mucho tiempo y los reactivos empleados contribuyen a la fragmentacion del ADN...

  13. Evaluation of positioning errors of the patient using cone beam CT megavoltage; Evaluacion de errores de posicionamiento del paciente mediante Cone Beam CT de megavoltaje

    Energy Technology Data Exchange (ETDEWEB)

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

    2013-07-01

    Image-guided radiation therapy allows you to assess and fix the positioning of the patient in the treatment unit, thus reducing the uncertainties due to the positioning of the patient. This work assesses errors systematic and errors of randomness from the corrections made to a series of patients of different diseases through a protocol off line of cone beam CT (CBCT) megavoltage. (Author)

  14. Integral municipal wastes management. Cost evaluation; Gestion integral de residuos urbanos. Evaluacion de rendimientos y costes de la recogida selectiva (Parte II)

    Energy Technology Data Exchange (ETDEWEB)

    Baldasano, J. M.; Ginestar, X.; Perez, C.; Gasso, S.

    2002-07-01

    The Spanish National Plan for Municipal Solid Waste (PNRU 2002-2006) includes an integrated waste management model that arranges the waste management options in order of priority: minimization, reuse, recycling (including composting and biomethanisation), energy recovery and final disposal. This paper makes an evaluation of the cost increases of the MSW separate collection for recycling compared to the traditional collection system. The first part of this paper include a description of the different possibilities to carry out the separate collection in terms of materials (containers and collectors), human resources and performances, as well as a comparison between its unitary costs. This second part contains a total cost evaluation and specially focuses on the organic matter and refuse separate collection comparing the lateral load system and the back load system in three temporal scenarios from 2001 to 2006. (Author)

  15. Municipal solid wastes management. cost evaluation of selective collecting; Gestion integral de residuos urbanos. Evaluacion de rendimientos y costes de la recogida selectiva (Parte I)

    Energy Technology Data Exchange (ETDEWEB)

    Baldasano, J. M.; Ginestar, X.; Perez, C.; Gasso, S.

    2002-07-01

    The Spanish Nuclear Plan for Municipal Solid Waste (PNRU 2000-2006) includes and integrated waste management model that arranges the management options of waste in order of priority: minimization, re-use, recycling (including composting and biomethanisation), energy recovery and final disposal. This paper makes an evaluation of the cost increase of the MSW separate collection for recycling compared to the traditional collection system. This first part includes a description of the different possibilities to carry out the separate collection in terms of materials (containers and collectors), human resources and performances, as well as a comparison between its unitary costs. (Author)

  16. Evaluacion de la resistencia adhesiva mediante la prueba de desalojo en postes de fibra de vidrio cementados en dientes naturales usando diferentes protocolos de cementacion

    National Research Council Canada - National Science Library

    Garzon Rayo, Herney; Moreno Preciado, Juliana; Campo Gomez, Isabel Cristina; Vivas Moncayo, Juan Carlos

    2016-01-01

    ...) y constituir una unidad que se integre a la dentina, formando un complejo unico. El objetivo de este articulo es determinar cual protocolo de cementacion de postes de fibra de vidrio presenta mejor resistencia adhesiva ante la prueba de desalojo...

  17. EVALUACION DEL RIEGO CON AGUA CLARA DE RELAVE ALTA EN MOLIBDENO Y SULFATOS SOBRE LA CALIDAD DEL SUELO Y DEL FORRAJE

    OpenAIRE

    ZBINDEN VELIZ, ANNELIE MARLEN

    2011-01-01

    La utilización continua en riego agrícola, de agua clara de relaves mineros generados por flotación alcalina de sulfuros de cobre, puede afectar la calidad del suelo, los productos agrícolas y la malla trófica, debido a que contiene altas concentraciones de molibdeno y sulfatos. El objetivo de ésta investigación fue evaluar el efecto del riego con agua clara de relave, alta en molibdeno y sulfatos, sobre la calidad química y biológica del suelo y sobre la calidad del forraje de ballica ...

  18. Supporting models for the evaluation of environmental effects after a radioactive contamination. Modelos de apoyo a la evaluacion tras una contaminacion radiaoctiva del medio ambiente

    Energy Technology Data Exchange (ETDEWEB)

    Martin Garcia, J.E.; Gallego Diaz, E. (Universidad Politecnica de Madrid (Spain). Escuela Tecnica Superior de Ingenieros Industriales)

    1993-01-01

    Within the project on optimization of site recovery measures after nuclear accidents which is being sponsored by the Commission of European Communities (CEC), two different models have been developed: URBAPAT and AGROPAT. Both models are a more realistic approach to deposited radionuclides performance and resultant doses either via external exposure at urban areas and via food products from rural areas, than other current codes on analysis of effects. Those models could support the adoption of protection measures in the aftermath of a radioactive accident, (by using, for instance, cost/profit analysis techniques or multiatribute tools), in order to improve the existing situation and to obtain the best solution for individuals and society. Developed models are flexible enough to be adapted to different sites and include the possibility to make sensitivity and uncertainty analysis of all parameters, as well as to consider a wide variety of protection measures.

  19. EL PERFIL DE LA PRACTICA ODONTOLOGICA Y LA FORMACION DE RECURSOS HUMANOS EN LA FACULTAD DE ODONTOLOGIA DE LA UNMSM EVALUACION ACADEMICA.

    OpenAIRE

    Castro Rodriguez, Antonia Florencia

    2014-01-01

    Habiéndose establecido luego del análisis de la Enseñanza de Odontología la existencia de dificultades en la conceptualización y aplicación de la Evaluación Académica en la formación de recursos humanos en Odontología, siendo patente un divorcio, entre ésta y el resto del proceso educativo, caracterizado por su predominante rol de tipo cancelatorio y promedial, sin considerar su importancia como factor esencial en los logros del aprendizaje; se desarrolló el presente trabajo planteándose como...

  20. DISEÑO DE UNA PROPUESTA SOBRE EVALUACION DE LA APLICACION DEL RECURSO DE RECONSIDERACION EN LA JURISDICCION ADUANERA DE SAN JOSE DE CUCUTA

    OpenAIRE

    Gereda Guevara, Mileicy; Molina Rolon, Claudia Maritza; Vega Alvarez, Ana Karina

    2008-01-01

    Analizar la incidencia que tiene el Recurso de Reconsideración en los comerciantes de la Jurisdicción Aduanera de San José de Cúcuta, así como también identificar los procedimientos en la aplicación de este e interpretar la norma de derecho aduanero que previene el ingreso de mercancías de contrabando.

  1. Protocolo Nacional para la Evaluacion de Disturbios en Suelos Forestales; Volumen II: Metodos complementarios, estadística y recoleccion de datos

    Science.gov (United States)

    Deborah S. Page-Dumroese; Ann M. Abbott; Thomas M. Rice

    2013-01-01

    Este documento-El Volumen II: Métodos complementarios, estadística y recolección de datos- define las bases, los métodos estadísticos y de almacenamiento de datos de un Protocolo Nacional para la Evaluación de Disturbios en Suelos Forestales. Esta guía técnica proporciona las bases de un método consistente, con definiciones comunes, para generar datos de alta calidad,...

  2. Thermomechanical evaluation of BWR fuel elements for procedures of preconditioned with FEMAXI-V; Evaluacion termomecanica de elementos combustible BWR para procedimientos de preacondicionado con FEMAXI-V

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez L, H.; Lucatero, M.A.; Ortiz V, J. [ININ, Carretera Mexico-Toluca Km 36.5, La Marquesa, Estado de Mexico (Mexico)]. e-mail: hhl@nuclear.inin.mx

    2006-07-01

    The limitations in the burnt of the nuclear fuel usually are fixed by the one limit in the efforts to that undergo them the components of a nuclear fuel assembly. The limits defined its provide the direction to the fuel designer to reduce to the minimum the fuel failure during the operation, and they also prevent against some thermomechanical phenomena that could happen during the evolution of transitory events. Particularly, a limit value of LHGR is fixed to consider those physical phenomena that could lead to the interaction of the pellet-shirt (Pellet Cladding Interaction, PCI). This limit value it is related directly with an PCI limit that can be fixed based on experimental tests of power ramps. This way, to avoid to violate the PCI limit, the conditioning procedures of the fuel are still required for fuel elements with and without barrier. Those simulation procedures of the power ramp are carried out for the reactor operator during the starting maneuvers or of power increase like preventive measure of possible consequences in the thermomechanical behavior of the fuel. In this work, the thermomechanical behavior of two different types of fuel rods of the boiling water reactor is analyzed during the pursuit of the procedures of fuel preconditioning. Five diverse preconditioning calculations were carried out, each one with three diverse linear ramps of power increments. The starting point of the ramps was taken of the data of the cycle 8 of the unit 1 of the Laguna Verde Nucleo electric Central. The superior limit superior of the ramps it was the threshold of the lineal power in which a fuel failure could be presented by PCI, in function of the fuel burnt. The analysis was carried out with the FEMAXI-V code. (Author)

  3. Analytical evaluation and optimization of advanced oxidation process in a solar pilot power plant; Evaluacion analitica y optimizacion de procesos de oxidacion avanzada en planta piloto solar

    Energy Technology Data Exchange (ETDEWEB)

    Garcia Vazquez, J.; Malato Rodriguez, S.; Rodriguez Fernandez-Alba, A.

    2003-07-01

    The technical feasibility mechanisms and performance of degradation of several pesticides (imidacloprid, methomyl and diuron) dissolved in water have been studies at pilot scale in two well-defined photocatalytic systems of special interest because natural UV light can be used: heterogeneous photocatalysis with titanium dioxide and homogeneous photocatalysis by photo-Fenton.Equivalent pilot-scale (made up of Compound Parabolic Collectors (CPCs) specially designed for solar photocatalytic applications) and field conditions used for both systems and the three pesticides allowed adequate comparison of the degree of mineralization and toxicity achieved as well as the transformation products generated en route to mineralization. Total disappearance of the parent compounds and 90% mineralisation have been attained with all pesticides tested, methomyl being the most difficult to be degraded with both treatments. First order rate constants, initial rate,time necessary for mineralizing 90% of the initial TOC and hydrogen peroxide consumption were calculated in all cases, enabling comparison both of treatments and of the selected pesticide reactivity. Complete mineralisation of TOC is not achieved even after quite a long time (more than 300 minutes). Three different bioassays (Vibrio fischeri, Daphnia magna and a Microalga) have been used for testing the progress of toxicity during treatments. All remained toxic down to very low pesticide disappearance of the pesticide. Only if treatment is maintained throughout enough mineralisation (i. e. TOC disappearance), the toxicity is reduced to below the threshold (EC 50%). Transformation products evaluated by GC-MS/AED (after two SPE procedures), LC-IT-MS and LC-IC were the same in both phototreatments. The main differences between the two processes are in the amount of transformation products (TPs) generated, not in the TPs detected which were always the same. (Author)

  4. Evaluation of energy saving in large scale projects in domestic lighting; Evaluacion del ahorro de energia en proyectos de gran escala en alumbrado domestico

    Energy Technology Data Exchange (ETDEWEB)

    Valera Negrete, Adrian [Comision Federal de Electricidad, Mexico, D.F. (Mexico)

    2001-07-01

    The present work shows the methodology and the necessary parameters are indicated to evaluate the energy saving and the reduction of power demand obtained, by the large scale projects of substitution of incandescent lamps by compact, circular fluorescent and globe type lamps in the domestic sector. [Spanish] El presente trabajo muestra la metodologia y se indican los parametros necesarios para evaluar el ahorro de energia y reduccion de la demanda de potencia obtenidos, por los proyectos de gran escala de sustitucion de focos incandescentes por lamparas fluorescentes compactas, circulares y tipo globo en el sector domestico.

  5. Evaluacion de la eficiencia de una bateria de filtros empacados en zeolita en la remocion de metales pesados presentes en un licor mixto bajo condiciones de laboratorio

    National Research Council Canada - National Science Library

    Acevedo Cifuentes, Diana Rocio; Builes Felizzola, Sandra Milena; Ordonez Ante, Carlos Andres; Lopez Sanchez, Idalia Jacqueline

    2011-01-01

    ... proveniente de la planta de tratamiento de aguas residuales de San Fernando y una solucion preparada con metales pesados con una concentracion conocida, mediante el uso de una bateria de filtros...

  6. Evaluating wind power potential in the Spanish Antarctic Base (BAE); Evaluacion del Potencial Eolico en la Base Antartica Espanola Juan Carlos I

    Energy Technology Data Exchange (ETDEWEB)

    Arribas de Paz, L. M.; Garcia Barquero, C.; Navarro Montesinos, J.; Cuerva Tejero, A.; Cruz Cruz, I.; Roque Lopez, V.; Marti Perez, I. [Ciemat. Madrid (Spain)

    2000-07-01

    The objective of the work is to model wind field in the surroundings of the Spanish Antarctic Base (BAE in the following). The need of such a work comes from the necessity of an energy source able to supply the energy demand in the BAE during the Antarctic winter. When the BAE is in operation (in the Antarctic summer) the energy supply comes from a diesel engine. In the Antartic winter the base is closed, but the demand of energy supply is growing up every year because of the increase in the number of technical and scientific machines that remain in the BAE taking different measurements. For this purpose the top of a closed hill called Pico Radio, not perturbed by close obstacles, has been chosen as the better site for the measurements. The measurement station is made up with a sonic an-emometer and a small wind generator to supply the energy needed by the sensors head heating of the anemometer. this way, it will be also used as a proof for the suitability of a wind generator in the new chosen site, under those special climactic conditions. (Author) 3 refs.

  7. Evaluation of radiological safety assessment of a repository in a clay rock formation. Evaluacion del comportamiento y de la seguridad de un almacenamiento profundo en arcilla

    Energy Technology Data Exchange (ETDEWEB)

    1999-12-15

    This report presents a comprehensive description of the post-closure radiological safety assessment of a repository for the spent fuel arisings resulting from the Spanish nuclear program excavated in a clay host rock formation. In this report three scenarios have been analysed in detail. The first scenario represents the normal in detail. The first scenario represents the normal evolution of the repository (Reference Scenario); and includes a set of variants to investigate the relative importance of the various repository components and examine the sensitivity of the performance to parameters variations. Two altered scenarios have also been considered: deep well construction and poor sealing of the repository. This document contains a detailed description of the repository system, the methodology adopted for the scenarios generation, the process modelling approach and the results of the consequences analysis. (Author)

  8. Evaluation method of reference levels of radiation diagnostic in computerized tomography; Metodo de evaluacion de niveles de referencia de radiodiagnostico en tomografia computarizada

    Energy Technology Data Exchange (ETDEWEB)

    Flores, Walter; Borges, Jose C. [Universidade Federal, Rio de Janeiro, RJ (Brazil). Coordenacao dos Programas de Pos-graduacao de Engenharia. Programa de Engenharia Nuclear; Mota, Helvecio C. [Instituto de Radioprotecao e Dosimetria (IRD), Rio de Janeiro, RJ (Brazil). Dept. de Fisica Medica

    2000-07-01

    The computerized tomography (CT) is a complex technique, with many parameters to be selected and protocols of quality control not standardized, connected with high doses in the patients. In this work a simple methodology is developed, to evaluate levels of reference of diagnosis in computerized tomography using the concept of Multiple Scan Average Dose (MSAD), recently adopted by the Ministry of Health of Brazil. This methodology, can be used in the routine of inspection of evaluation of radiological safety in medical radiation diagnostics, executed by the Department of Medical Physics of the Institute of Radiation Protection and Dosimetry and by the sanitary authorities in Brazil. In order to evaluate this dosimeter magnitude the distribution of dose it was studied the dose distribution obtained trough a profile of dose measured in the axial axis of a simulator(phantom) of water with thermoluminescent dosimeters, TLD-100, for three techniques of examination by CT. The magnitude MSAD was evaluated by means of two different methods. In first, it was evaluated for an only cut, and in the second for multiple cuts. This last method presents/displays to be more practical and adapted to be applied in the routine of evaluation of reference levels, with TLDs.

  9. Evaluation of behaviour and Safety in a geologic deep repository; Evaluacion del comportamiento y de la seguridad de un almacenamiento geologico profundo en granito

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1997-07-01

    This report presents a comprehensive description of the post-closure radiological safety assessment of a repository for the spent fuel arisings resulting from the Spanish nuclear program. This Safety Assessment constitutes a first step within a systematical process that will permit, thorough successive approximations, to predict the performance of the different barriers of the disposal system, and its capability to comply with the assigned safety functions and with the established safety criteria. The primary bases for this Safety Assessment are the following: The disposal concept considers the storage of the fuel assemblies in carbon steel canisters of 10 cm of thickness, emplaced horizontally in galleries excavated in granite of 2,4 m of diameter and 500 m of length, using a bentonite thickness of 75 cm around canisters as buffer material. The repository is located in a granitic site defined with available data about surface characteristics of Spanish granites. The exercise uses a probabilistic approximation in order to cope with the uncertainties associated with the different imputs parameters. (Author)

  10. Risk assessment criteria and monitoring programmes for preventing legionellosis; Criterios para la evaluacion del riesgo y programas de control para la prevencion de la legionelosis

    Energy Technology Data Exchange (ETDEWEB)

    Marco, J.

    2003-07-01

    After the publication of the Royal Decree 909/2001 for the prevention of the legionnaires' disease, in all the risk systems described in it is obligatory to carry out a revision and exam of all the parts of the installation to assure their correct operation and to establish the revision points, parameters to measure and the procedures to follow, as well as the frequency of each activity. All these concepts, nevertheless don't figure detailed in the Royal Decree and their determination presents for many users an important problem. The present article provides an information based mainly on the Royal Decree and on other European guides for the prevention of the legionnaires diseases,nd describes which are the most important points to control in any risk installation and which could be the control systems to use to avoid the development of Legionella. (Author) 25 refs.

  11. Energy and industrial development: evaluation for the Valdivia region provincia de Valdivia; La energia en el desarrollo industrial, evaluacion diagnostica para la

    Energy Technology Data Exchange (ETDEWEB)

    Loaiza H, Renato [Universidad Austral de Chile, Valdivia (Chile). Inst. de Electricidad y Electronica; Fuentes P, Misael; Paredes C, Marcelo [Universidad Austral de Chile, Valdivia (Chile). Inst. de Materiales y Procesos Termomecanicos

    1996-12-31

    Under a global prospect, enterprises development are analysed, considering former investments in specific sectors and its consequences in administrative and production management of energy sources as well as the need for technological changes. 6 refs., 5 figs., 8 tabs.

  12. Post-irradiation evaluation of hydrogen and deuterium concentration in zirconium alloys; Evaluacion post-irradiacion de la concentracion de hidrogeno mas deuterio en aleaciones de circonio

    Energy Technology Data Exchange (ETDEWEB)

    Banchik, A.D.; Bianchi, D.; Rios, R. [Comision Nacional de Energia Atomica, Buenos Aires (Argentina). Centro Atomico Ezeiza

    1999-11-01

    The mechanical and metallurgical properties of the components of the nucleus of a reactor change along its operation life. The changes in the zirconium components include the pick-up of a fraction of the hydrogen produced by the reaction of zirconium with water and the development of a zirconium oxide layer at the zirconium oxide layer at the zirconium surfaces in contact with water. The amount of pick-up depends of several factors, that way it is necessary to measure it periodically. The PHWR reactors, that work with heavy water, incorporate deuterium instead of hydrogen, which added to the hydrogen incorporated in the matrix during fabrication increases the total content of hydrogen plus deuterium A method for measurement of the deuterium content in the hydrogen plus deuterium mix with a Leco equipment for hydrogen is presented, the statistical errors are estimated with specimen duplicates and the procedure for reducing the normal background is described. A method is developed for measuring the deuterium concentration in a mixture with a Leco equipment for hydrogen. Based in the theory of gas mixture it has been determinate that the deuterium concentration values given by that equipment are in ppm of hydrogen equivalent. The value of the correction factor FC for correcting the digital reading is FC = 1,47 +/- 0,06. The statistical error of the measurements is estimated by duplicates of the active specimens, and it is was determined that more than 90% of the results have an error lower than 2 ppm. A procedure for reducing the background based on a double melting of the tin flux is proposed, the average value is reduced from 0,9 ppm to 0,6 and the standard deviation from 0,35 ppm to 0,15 ppm. (author) 8 refs., 4 figs., 3 tabs.

  13. Dosimetric assessments multi-slice CT of the chest and abdomen in pediatrics; Evaluaciones dosimetricas en TC multicorte de torax y abdomen en pediatria

    Energy Technology Data Exchange (ETDEWEB)

    Giner Sala, M.; Roch Gonzalez, M.; Rodriguez Martin, G.; Garcia Castanon, P.; Espana Lopez, M. L.

    2013-07-01

    The objective of this study is the dosimetry evaluation in pediatric MSCT of thorax and abdomen, and the estimation of effective dose in the different ranges of age taking into account the new ICRP recommendations, by variations that may be involved in explorations that affect breast. (Author)

  14. Developing a methodology for the evaluation of results uncertainties in CFD codes; Desarrollo de una Metodologia para la Evaluacion de Incertidumbres en los Resultados de Codigos de CFD

    Energy Technology Data Exchange (ETDEWEB)

    Munoz-cobo, J. L.; Chiva, S.; Pena, C.; Vela, E.

    2014-07-01

    In this work the development of a methodology is studied to evaluate the uncertainty in the results of CFD codes and is compatible with the VV-20 standard Standard for Verification and Validation in CFD and Heat Transfer {sup ,} developed by the Association of Mechanical Engineers ASME . Similarly, the alternatives are studied for obtaining existing uncertainty in the results to see which is the best choice from the point of view of implementation and time. We have developed two methods for calculating uncertainty of the results of a CFD code, the first method based on the use of techniques of Monte-Carlo for the propagation of uncertainty in this first method we think it is preferable to use the statistics of the order to determine the number of cases to execute the code, because this way we can always determine the confidence interval desired level of output quantities. The second type of method we have developed is based on non-intrusive polynomial chaos. (Author)

  15. Criticality evaluation of long term for spent fuel, using Scale; Evaluacion de criticidad a largo plazo para combustible gastado, utilizando SCALE

    Energy Technology Data Exchange (ETDEWEB)

    Esquivel E, J.; Vargas E, S.; Ramirez S, J. R., E-mail: jaime.esquivel@inin.gob.mx [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico)

    2013-10-15

    Once carried out the spent fuel discharge, of the reactor core, this continues generating decay heat and diverse fission products, reason why is important to store this fuel inside containers able to dissipate the heat generated by the isotopes decay of the fuel and to maintain the fuels arrangement in subcritical condition. This means that: is necessary to assure the sub-criticality of those fuel assemblies in the time. This work, presents a criticality evaluation of fuel assemblies type PWR in a storage generic container. For this purpose have been used two codes: GeeWiz, to carry out the geometric model of the container with the fuel assemblies, and Keno, with which, the criticality of the full container with fuel is determined until a 10{sup 6} years period. These codes are part of the package Scale. The specifications for each one of the analyzed components are based on a Benchmark document of the Nea/OECD, of where, the results that reports are compared with the obtained results by the realized analysis. (Author)

  16. Evaluation of the different supported bifunctional electrocatalysts for unified regenerative cells; Evaluacion de diferentes soportes de electrocatalizadores bifuncionales para celdas regenerativas unificadas

    Energy Technology Data Exchange (ETDEWEB)

    Gurrola, M. P.; Torres-Amaya, D. S.; Duron-Torres, S. M.; Escalante-Garcia, I. L. [Universidad Autonoma de Zacatecas, Unidad Academica de Ciencias Quimicas, Zacatecas (Mexico)]. E-mail: duronsm@prodigy.net.mx; Arriaga-Hurtado, L.G. [Centro de Investigacion y Desarrollo Tecnologico en Electroquimica, Pedro Escobedo, Queretaro (Mexico)

    2009-09-15

    Unified regenerative fuel cells (URFC) represent an alternative to normal regenerative cells, providing decreased costs and space in one single device. The challenges of these systems are even greater than those for conventional fuel cells, with the most pressing technical problem being the optimization of the oxygen electrode. The high operating potentials of these devices in the electrolyzer mode, E >1.6 V vs. ENH, limit the use of supported Pt/Vulcan electrodes. The electroactivity of Pt is not sufficient to catalyze the oxygen evolution reaction (OER) and at these potentials carbon-based supports undergo corrosion. In addition to studies of materials that function as bifunctional catalysts, a significant amount of research is being aimed at the search of new matrixes for use in supporting electrocatalysts for OER and ORR{sup 1,2}. This work presents the preliminary results of the kinetic study of oxygen reactions on different Pt combinations, with IrO{sub 2} and RuO{sub 2} supported by different forms of carbon and substoichiometric titanium oxide. The studies were conducted using cyclical (CV) and linear (LV) voltamperometry for OER and rotary disc electrode (RDE) for the ORR in watery H{sub 2}SO{sub 4} 0.5M solutions. The chronoamperometry (CA) technique provided information about the electrochemical stability of the electrodes. The results indicate that the performance of the electrodes supported by different forms of carbon decreases gradually as a result of corrosion when consecutive cycles of oxygen reduction and formation reactions occur. Titanium oxide provides the greatest stability to electrodes constructed on that material and thus can potentially support oxygen electrodes based on combinations of Pt, IrO{sub 2} and RuO{sub 2} as binfunctional electrocatalysts for the URFC. [Spanish] Las celdas de combustible regenerativas unificadas (URFC) representan una alternativa a las celdas regenerativas normales que implica disminucion de costos y espacio en un solo dispositivo. Los retos de estos sistemas son aun mayores que en las celdas de combustible convencionales, siendo el problema tecnico mas apremiante, la optimizacion del electrodo de oxigeno. Los altos potenciales de operacion de estos dispositivos en el modo electrolizador, E >1.6 V vs. ENH, limitan el empleo de electrodos de Pt soportados en Vulcan. El Pt no es lo suficientemente electroactivo para catalizar la reaccion de evolucion de oxigeno (OER) y a estos potenciales los soportes basados en carbon sufren corrosion. Ademas de los estudios sobre materiales que funcionen como catalizadores bifuncionales, un importante numero de investigaciones se estan dirigiendo a la busqueda de nuevas matrices para su uso como soportes de electrocatalizadores para la OER y ORR{sup 1,2}. En este trabajo, se presentan los resultados preliminares obtenidos para el estudio cinetico de las reacciones de oxigeno, sobre diferentes mezclas de Pt con IrO{sub 2} y RuO{sub 2} soportados en diferentes formas de carbon y oxidos de titanio subestequiometricos. Los estudios se realizaron empleando voltamperometria ciclica (CV) y lineal (LV) para la OER y electrodo disco rotatorio (EDR) para la ORR en soluciones acuosas de H{sub 2}SO{sub 4} 0.5M. La tecnica de cronoamperometria (CA) proporciono informacion de la estabilidad electroquimica de los electrodos. Los resultados indican que los electrodos soportados en diferentes formas de carbon disminuyen paulatinamente su desempeno como consecuencia de la corrosion al realizar las reacciones de reduccion y formacion de oxigeno en ciclos consecutivos. Los oxidos de titanio, le confieren una mayor estabilidad a electrodos construidos sobre ese material, significando que pudieran representar un potencial como soporte para electrodos de oxigeno basados en mezclas de Pt, IrO{sub 2} y RuO{sub 2} como electrocatalizadores bifuncionales para las URFC.

  17. Evaluacion in vivo del efecto cicatrizante de un gel a base de quitosano obtenido de exoesqueleto de camaron blanco Litopenaeus vannamei

    National Research Council Canada - National Science Library

    Martinez Sanchez, Heimy Franceline; Escobedo Lozano, Amada Yeren; Mendez-Gomez, Evaristo; Vazquez, Alfredo Emmanuel; de Jesus Sol Hernandez, Manuel; Osuna Lizarraga, Anahi Elizabeth

    2014-01-01

    .... Para atender esta problematica, se propone el uso de un gel de quitosano, obtenido del exoesqueleto de camaron ya que presenta actividad antimicrobiana e inmunologica acelerando la cicatrizacion...

  18. Application of seismic experience assessing capacity pipes-non class; Aplicacion de la experiencia sismica a la evaluacion de capacidad de tuberias no-clase

    Energy Technology Data Exchange (ETDEWEB)

    Beltran, F.; Salgado, S.

    2012-07-01

    In the current context, the systematic verification of compliance with the requirements arising from the experience is a very effective alternative to show safety from flooding and quickly identify potential vulnerabilities.

  19. Evaluacion de requerimientos para la adecuada gestion de conocimiento, caso de estudio en una unidad organizacional de soporte operativo de una entidad financiera

    National Research Council Canada - National Science Library

    Martinez Diaz, Juan Carlos

    2013-01-01

    .... Asi, la investigacion efectuada tuvo como objetivo evaluar los requerimientos organizacionales y tecnologicos que propician la intencion de compartir el conocimiento, siendo esta actividad vital...

  20. Radiological assessment occupational radionuclides in a phosphoric acid plant; Evaluacion radiologica ocupacional y distribucion de radionucleidos en una planta de acido fosforico

    Energy Technology Data Exchange (ETDEWEB)

    Bolivar, J. P.; Garcia-Tenorio, R.

    2008-07-01

    On the frame of a research project devoted to the control of the exposure due to natural radiation in several NORM industries located at the South of Spain, a detailed to the production of phosphoric acid has been performed. In addition, the behaviour along the mentioned process of the different radionuclides involved has been analysed. It has been concluded that the effective dose which can be received by the workers of the plant is clearly below 1 mSv/year. And it has been demonstrated that the main route of occupational exposure corresponds to the external radiation due mainly to the permanent presence of a radioactive contamination source in different zones of the plant. This contamination source is associated to the presence of scales in the inner surfaces of pipes and equipment as well as to the presence of sludges in the phosphoric acid storage tanks, which in both cases contain elevated concentrations of 226{sup R}a. Moreover, the 222{sup R}n concentrations inside the plant do not overpass 100 Bq/m{sup 3}, which not constitutes a radiological problem. (Author) 9 refs.

  1. De las evaluaciones particulares a los perfiles generales. Más allá de los dictámenes en investigación educativa

    Directory of Open Access Journals (Sweden)

    Armando Ulises Cerón Martínez

    2015-07-01

    Full Text Available Se discuten los procesos de formación y sus efectos para la investigación educativa a nivel posgrado, específicamente en la Maestría en Educación Campo-Práctica Educativa (MECPE de la Universidad Pedagógica Nacional del Estado de Hidalgo (UPNH. Un habitus científico no se detecta durante los procesos formativos, en el caso de los posgraduantes sino, como dice Bourdieu, una vez que el proceso de inculcación de la acción pedagógica ha terminado. Es en este sentido que partimos de la premisa que si se han formado disposiciones para la investigación hay que buscarlas más allá del acto pedagógico. Hemos detectado y analizado con un enfoque mixto a los egresados de siete generaciones de la MECPE que enviaron trabajos al XI Congreso Nacional de Investigación Educativa (XI CNIE para su eventual consideración tras el dictamen de los evaluadores. Las regularidades detectadas hablan de un perfil homogéneo del programa.

  2. Evaluacion de la friccion en arcos ortodoncicos de acero inoxidable con y sin recubrimiento vitreo aplicado por el metodo Sol-Gel

    National Research Council Canada - National Science Library

    Valencia Alvarez, Jose A; Garcia Garcia, Claudia; Jaramillo Vallejo, Pedro M; Montoya Goez, Yesid; Pelaez Vargas, Alejandro

    2009-01-01

    Introduccion: el proposito de este estudio in vitro fue comparar la fuerza de friccion estatica y dinamica generada entre brackets y alambres de acero inoxidable con y sin recubrimiento vitreo aplicado por el metodo Sol-Gel. Metodos...

  3. Daño psicológico en casos de víctimas de violencia de género: estudio comparativo de las evaluaciones forenses

    Directory of Open Access Journals (Sweden)

    Ramón Arce

    2015-07-01

    Full Text Available Se diseñó un estudio con el objetivo de comparar la eficacia de la evaluación forense basada en una medida psicométrica con la basada en el análisis de contenido de la entrevista del daño psicológico en casos de violencia de género. Para este cometido, la evaluación forense no solo ha de proporcionar una evaluación del daño psicológico, sino también establecer una relación causa-efecto entre hechos enjuiciados y daño, así como un diagnóstico diferencial de simulación. Para ello se solicitó a 101 mujeres, mentalmente sanas y sin antecedentes de violencia de género, que simularan daño psicológico derivado de la vivencia de violencia de género en el MMPI-2 y en una entrevista narrativa en recuerdo libre, la entrevista clínico-forense de Arce y Fariña (2001. Los resultados mostraron que las mujeres disponían de una capacidad muy elevada de simulación en el modelo psicométrico, el MMPI-2, del 79,6%. En cuanto al diagnóstico diferencial de simulación, si bien las escalas de validez clasificaron consistentemente de forma correcta como simuladoras al 80,2%, el 19,8% no fueron detectadas como tales. Como en la evaluación forense el error tipo II no es admisible (clasificación de un daño simulado como real, la evaluación psicométrica no es prueba suficiente de daño. El análisis de contenido de la entrevista clínico-forense puso de manifiesto que el 3% de las participantes lograron simular la huella psicológica, detectándose en el 97% narrativas no normativas, esto es, falsas. Si bien el análisis de contenido de la entrevista clínico-forense dificulta y detecta más la simulación que la evaluación psicométrica, tampoco es prueba suficiente por sí misma, ya que no controla totalmente el error tipo II. Se discuten las implicaciones para la práctica forense de estos resultados.

  4. Evaluation of NORM in facility Venezuelan oil industry to establish regulatory criteria; Evaluacion de NORM en una instalacion de la industria petrolera venezolana para establecer los criterios reguladores

    Energy Technology Data Exchange (ETDEWEB)

    Acevedo Lozada, D. J.; Rivas, I.; Davila, L.; Flores, Y.

    2013-07-01

    The present work shows the need to identify, in the Venezuelan oil industry, the existence of exposure to natural sources of radiation should be considered as occupational. As Regulatory Authority in the area of ionizing radiation the need for regulatory processes and ensure radiation protection of personnel involved in these practices arises, as well as personal and environmental monitoring. NORM identifying an installation of the Venezuelan oil industry to establish regulatory processes and take steps to ensure occupational radiation protection. (Author)

  5. De la apologia al triste cantar: la evaluacion de la Conquista de Mexico en las piezas teatrales de John Dryden y Fernando de Zarate

    National Research Council Canada - National Science Library

    Nunez-Ronchi, Ana

    2012-01-01

    .... Recurriendo al aparato teorico-metodologico de la semantica interpretativa, este trabajo se propone comparar la vision inglesa y la espanola de la conquista de Mexico en dos piezas de teatro europeas...

  6. Evaluation of visual impact of solar hermal systems on urban landscape; Metodo de evaluacion del impacto visual de las instalaciones de energia solar termica en el paisaje urbano

    Energy Technology Data Exchange (ETDEWEB)

    Lopez, G.; Martinez, J.

    2004-07-01

    This article proposes a methodology and systematics for the valuation and evaluation of the visual impact produced by solar thermal systems on urban landscapes. On the one hand, from the characteristics of solar thermal systems capable of producing a visual impact and, on the second hand, from the analysis of the urban landscape (character and perception; classification in three subtypes), an interrelationship of the system and the urban landscape parameters is established by means of matrixes. The result shall be the visual impact of a solar thermal system on an urban landscape, which may range from a minimum (Nonexistent) to a maximum (Unacceptable), including other categories like Acceptable, Compatible, Compatible with Corrections, and Incompatible. (Author)

  7. Some aspects of prospecting and geological evaluation of the coal deposits. Algunos aspectos de prospeccion y evaluacion geologica de los yacimientos de carbon

    Energy Technology Data Exchange (ETDEWEB)

    Zajaczkowski, E. (Cacbosuroeste, San Cristobal (Venezuela))

    1989-08-01

    Geological prospecting for minerals should provide a sound basis for determining the industrial worth of the deposits. Decisions are taken according to the geological evaluation. Most important factor is the magnitude of reserves. All deposits should have good reliable, comparable and complete data. A number of principles of successive approximation, time and money minimum expenditures, identical criteria - should be uniform everywhere.

  8. Chemical study and antifouling activity of Caribbean octocoral Eunicea laciniata;Estudio quimico y evaluacion de la actividad antifouling del octocoral caribeno Eunicea laciniata

    Energy Technology Data Exchange (ETDEWEB)

    Cuadrado Silva, Carmen Tatiana; Castellanos Hernandez, Leonardo; Osorno Reyes, Oscar Eduardo; Ramos Rodriguez, Freddy Alejandro; Duque Beltran, Carmenza, E-mail: lcastellanosh@bt.unal.edu.c [Universidad Nacional de Colombia, Bogota (Colombia). Fac. de Ciencias. Dept. de Quimica; Puyana Hegedus, Monica [Universidad Jorge Tadeo Lozano, Bogota (Colombia)

    2010-07-01

    The bioassay guided purification of the octocoral Eunicea laciniata organic extract, collected at Santa Marta bay, Colombia, allowed the isolation of the new compound (-)-3beta-pregna-5,20-dienyl-beta-D-arabinopyranoside (1), along with the known compounds 1(S{sup *}),11(R{sup *})-dolabell-3(E),7(E),12(18)-triene (2), 13-keto-1(S),11(R)-dolabell-3(E),7(E),12(18)-triene (3), cholest- 5,22-dien-3beta-ol (4), cholesterol (5), y brassicasterol (6). The structure and absolute configuration of 1 was determined on based spectroscopic analyses (NMR and CD). The extract showed antifouling activity against five strains of marine bacteria associated to heavy fouled surfaces. Also showed activity against the cypris of the cosmopolitan barnacle Balanus amphitrite, and low toxicity in Artemia salina test. (author)

  9. Commissioning of a Monte Carlo treatment planning system for clinical use in radiation therapy; Evaluacion de un sistema de planificacion Monte Carlo de uso clinico para radioterapia

    Energy Technology Data Exchange (ETDEWEB)

    Zucca Aparcio, D.; Perez Moreno, J. M.; Fernandez Leton, P.; Garcia Ruiz-Zorrila, J.

    2016-10-01

    The commissioning procedures of a Monte Carlo treatment planning system (MC) for photon beams from a dedicated stereotactic body radiosurgery (SBRT) unit has been reported in this document. XVMC has been the MC Code available in the treatment planning system evaluated (BrainLAB iPlan RT Dose) which is based on Virtual Source Models that simulate the primary and scattered radiation, besides the electronic contamination, using gaussian components for whose modelling are required measurements of dose profiles, percentage depth dose and output factors, performed both in water and in air. The dosimetric accuracy of the particle transport simulation has been analyzed by validating the calculations in homogeneous and heterogeneous media versus measurements made under the same conditions as the dose calculation, and checking the stochastic behaviour of Monte Carlo calculations when using different statistical variances. Likewise, it has been verified how the planning system performs the conversion from dose to medium to dose to water, applying the stopping power ratio water to medium, in the presence of heterogeneities where this phenomenon is relevant, such as high density media (cortical bone). (Author)

  10. Evaluation of defects induced by neutron radiation in reactor pressure vessels steels; Evaluacion de los defectos inducidos por la radiacion neutronica en los aceros de vasijas

    Energy Technology Data Exchange (ETDEWEB)

    Lopez Jimenez, J.

    1978-07-01

    We have developed a method for calculating the production of neutron induced defects (depleted zone and crowdions) in ferritic pressure vessel steels for different neutron spectra. They have been analysed both the recoil primary atoms produced by elastic and inelastic collisions with fast neutrons and the ones produced by gamma-ray emission by thermal neutron absorption. Theoretical modelling of increasing in the ductile-brittle transition temperature of ferritic steels has been correlated with experimental data at irradiation temperature up to 400 degree centigree (Author) 15 refs.

  11. IDENTIFICACION DE PRODUCTOS EXTRACELULARES DE DOS BACTERIAS MARINAS INHIBIDORAS DE VIBRIO PARAHAEMOLYTICUS Y EVALUACION DEL POTENCIAL USO DE ESTOS PRODUCTOS COMO CONTROL DE ESTE PATOGENO

    OpenAIRE

    LEYTON LOBOS, YANETT

    2012-01-01

    La bacteria patógena Vibrio parahaemolyticus es responsable de enfermedades gastroentéricas causadas por la ingesta de organismos marinos, principalmente moluscos contaminados. Debido a esto, en las industrias acuícolas existe un gran interés por aplicar productos bioactivos medioambientalmente inocuos que eliminen bacterias patógenas desde sus cultivos y así, reemplazar a los antibióticos usados por años, los que han generado grandes problemas de contaminación en los ecosistemas marinos. El ...

  12. Evaluaciones microcalorimétricas no-isotermas en aleaciones de Cu-9Ni-5,5Sn templadas y deformadas en frío

    Directory of Open Access Journals (Sweden)

    Donoso, E.

    2012-02-01

    Full Text Available The thermal aging of both a quenched and a cold rolled homogeneous supersaturated Cu-9 % wt Ni-5.5 wt % Sn alloy has been studied from differential scanning calorimetry (DSC and microhardness measurements. An increase of the hardness during the aging of the quenched sample, because of the precipitation of a Υ´ phase, takes place. On the contrary, no hardness increase was observed during the aging of the cold rolled sample. A theoretical analysis of the enthalpy determined from the first DSC exothermic peak suggests that a segregation of the solute towards the dislocations occurs during the aging of the cold rolled alloy. The values of the n Avrami-Erofeev coefficients estimated from the kinetic analysis supports the above interpretations.

    Se ha estudiado por calorimetría diferencial de barrido (DSC y medidas de microdureza, el comportamiento durante el recocido de una aleación Cu-9 % Ni-5,5 % Sn templada y deformada por laminación en frio al 50 %, respectivamente. Se ha concluido que durante el tratamiento térmico de la muestra templada tiene lugar un aumento de la microdureza atribuido a la precipitación de una fase Υ´ de composición (CuxNi1x3Sn. Sin embargo, no se ha observado un aumento de dureza durante el recocido de la muestra deformada en frío. Este comportamiento se ha interpretado considerando que las dislocaciones generadas por la laminación en frío, favorecen la segregación de soluto (níquel y estaño hacia las dislocaciones en lugar de la formación de la fase (CuxNi1-x3Sn. Tanto el análisis teórico de la entalpía determinada para esta etapa como los valores de los coeficientes n de Avrami-Erofeev determinados a partir de un análisis cinético apoyan esta interpretación.

  13. Mechanical evaluation of linear friction welds in titanium alloys through indentation experiments; Evaluacion mecanica mediante tecnica de indentacion de soldaduras por friccion lineal en aleaciones de titanio

    Energy Technology Data Exchange (ETDEWEB)

    Corzo, M.; Casals, O.; Alcala, J.; Mateo, A.; Anglada, M.

    2005-07-01

    This article shows the results of a project that focuses on the characterization of the weld interface region of dissimilar joints between titanium alloys for aeronautical applications, specifically Ti-6Al-2Sn-4Zr-6Mo with Ti-6Al-4V, and Ti-6Al-2Sn-4Zr-6Mo with Ti-6Al-2Sn-4Zr-2Mo. The uniaxial flow stress and hardening response of the material containing the weld were analyzed following the finite elements simulations and mathematical formulations to correlate hardness and the amount of pile-up and sinking-in phenomena around sharp indenters with uniaxial mechanical properties. This allows to accurately stablishing the influence that welding process has on the mechanical response of the parts. Tests performed on these friction-welded specimens showed that the fine grained microstructures in the welds exhibited better properties than the base materials. (Author) 12 refs.

  14. Seismic evaluation of the structures of the reactor building. Project IAEA-EBP KARISMA; Evaluacion sismica de las estructuras del edificio del Reactor. Proyecto KARISMA IAEA-EBP

    Energy Technology Data Exchange (ETDEWEB)

    Ezeberry, J.; Fernandez, A.; Garcia, M.; Moreno, A.; Jimenez, A. M.; Sanchez, J. G.

    2010-07-01

    This research project includes a number tasks where an evaluation of the seismic response of the plant. The first phase of the project involves the assessment of the response of the structure to static, modal analysis, analysis of the soil column and analysis of soil structure interaction. In a second task evaluates RHR system behavior to seismic loads. This paper describes the work done within these two activities.

  15. Uncertainties in the dosimetric assessments of NORM management in conventional waste repository; Incertidumbres en las evaluaciones dosimetricas de la gestion de NORM en repositorios de residuos convencionales

    Energy Technology Data Exchange (ETDEWEB)

    Mora, J. C.; Robles, B.

    2012-07-01

    Naturally Occurring Radioactive Materials (NORM) are generated in huge quantities in several industries-NORM industries-and their management has been formerly carried out in most countries under considerations of industrial non radioactive wastes, with varying considerations on their radioactive content. As the concentration of non radioactive tonics in several of those materials is relatively high, they were treated as toxic materials. This implies that the materials must be previously conditioned using conventional methods and that the waste disposal itself must be prepared to isolate the toxic from the environment for long periods of time. Spanish regulation for these conventional toxic waste disposals include conditions that assure adequate isolation, also including considerations on their radioactive content in such a way that their management way guarantee radiological protection on the people and the environment. After the 96/29 European Directive (the European BSS), radiological implications on NORM industries and their residual materials must be considered. One option that can be considered for the disposal of NORM with activity concentrations above the established unconditional clearance level is the use of the same industrial waste disposals, if guarantees for corresponding radiological criteria are accomplished, according to Authorities establishment. This work analyses the radiological implications of the management of NORM under the considerations applicable for their management as conventional waste, emphasising in activity concentrations slightly over unconditional clearance levels specifically from 1 Bq up to 50 Bq.g{sup -}1. Resulting generic dose assessments are usually carried out under highly conservative hypothesis. This study discusses uncertainties that should be considered to include possible variation due to climate factors or other parameters used in the assessment models. (Author)13 refs.

  16. Analysis of uncertainties in assessments of dose to the public: Probabilistic Crom; Analisis de incertidumbres en las evaluaciones de la dosis al publico: Crom Probabilista

    Energy Technology Data Exchange (ETDEWEB)

    Mora, J. C.; Robles, B.; Cortes, D.; Rodriguez, J.

    2011-07-01

    The deterministic version of CROM is useful for conservative assessments, but can be used to obtain estimates using more realistic values. However, a more realistic estimate as that entails the need to assess the uncertainties associated with the outcome. To move in this direction has developed a new version of CROM has the added ability to perform the calculations of these uncertainties.

  17. Assessment of environmental radiological findings in a service experimental biological irradiation; Evaluacion de los resultados radiologicos ambientales en un servicio de irradiacion biologica experimental

    Energy Technology Data Exchange (ETDEWEB)

    Macias Dominguez, M. T.; Barros, C.; Hernandez, D.; Pina Zapardiel, R.

    2013-07-01

    This paper presents the evaluation of the data dosimetric environmental obtained in the last 4 years in different areas of work related to the techniques of irradiation, with special attention to the levels of radiation to areas of free access, to ensure that the dose in these dependencies are lower than the doses to members of the public. (Author)

  18. Assessment of evolutive and prognostic indicators applied to accidental overexposure to ionizing radiation; Evaluacion de indicadores pronosticos y evolutivos aplicables a situaciones accidentales de sobreexposicion a radiaciones ionizantes

    Energy Technology Data Exchange (ETDEWEB)

    Morera Carrillo, M. de Lourdes; Cardenas, J. [Centro de Proteccion y Higiene de las Radiaciones, La Habana (Cuba); Dubner, D.; Perez, M. del Rosario; Gisone, P. [Autoridad Regulatoria Nuclear, Buenos Aires (Argentina). Lab. de Radiopatologia; Carnot, J. [Hospital Clinico Quirurgico Hermanos Ameijeiras, La Habana (Cuba)

    2001-07-01

    The acute radiation syndrome has been characterized in different ways that involve risk for life and health of the people overexposed to ionizing radiations. This work intends to test a therapeutical total body irradiation (TBI) model as conditioning to bone marrow transplantation. With the purpose of evaluating the applicability of several biological indicators in accidental overexposures, a study was carried out in 46 patients undergoing TBI receiving doses between 10 Gy and 12 Gy. The following parameters were assessed: lipo peroxyde plasmatic levels (TBARS) and total plasma antioxidant activity, reticulocyte maturity index (RMI) and charges in lymphocyte subpopulations. These data suggest that TBARS could provide an useful evolutive indicator in accidental overexposed patients and RMI is an early indicator of bone marrow recovery after radioinduced aplasia.

  19. Automatic evaluation procedure for the drilling of an offshore well; Procedimiento de evaluacion automatica de la perforacion de un pozo marino

    Energy Technology Data Exchange (ETDEWEB)

    Ortiz, B. [Petroleos Mexicanos (PEMEX) (Mexico); Martinez, J. [Instituto Mexicano de Petroleo, Mexico City (Mexico)

    1996-12-31

    This paper presents a methodology to the evaluation of well drilling in the marine zone of Mexico, which can be applied to any kind of well in any region and any kind of international contract. This procedure is an automatic process and can reduce human errors. 2 refs., 11 tabs.

  20. Synthesis, characterization and electric evaluation of barium zirconate doped with trivalent lanthanides; Sintesis, caracterizacion y evaluacion electrica de circonatos de bario dopados con lantanidos trivalentes

    Energy Technology Data Exchange (ETDEWEB)

    Gerena, O. A.; Carda, J. B.; Beltran, H.; Cordoncillo, E.; Valencia, J. S.

    2014-04-01

    Barium zirconate is an oxidic material having perovskite structure that exhibits high chemical stability in both oxidizing and reducing environments, such as in the presence of water and carbon dioxide, its conductivity has led to consider it as a electrolyte for solid oxide fuel cell finding good results, with the limitation of operating at temperatures above 800 degree centigrade. Several researchers have proposed that it is possible to improve their electrical conductivity by changes in chemical composition, particularly for doping with trivalent cations that replace the zirconium in B site of perovskite. In this study, barium zirconate was synthesized by the amorphous citrate method to examine the possibility of obtaining in more favorable conditions than those made by the conventional method of synthesis (ceramic method or solid state reaction) conditions are synthesized. Barium zirconate doped with europium, gadolinium, holmium, lanthanum, neodymium and praseodymium was prepared, the present phase identified cation was verified by X-ray diffraction (XRD), the electrical properties were examined by impedance spectroscopy (IS) at temperatures between 480 and 680 degree centigrade in order to evaluate its potential use as a fuel cell electrolyte in solid oxide. The contributions of this research has focused on the synthesis method, in the production of ceramic powders of barium zirconate at temperatures lower than those required by the ceramic method, in obtaining chemical, structural, morphological and electrical information of material synthesized. The desired phase synthesis conditions set found, also, a significant increase is seen in the solid conductivity of doped lanthanum, holmium and europium zirconate of barium in relation to the material without doping. (Author)

  1. Assessing the impact of the dispersion of fuel in case of LOCA; Evaluacion del impacto de la dispersion de combustible en caso de LOCA

    Energy Technology Data Exchange (ETDEWEB)

    Concejal, A.; Garcia Sedano, P. J.; Crespo, A.

    2013-07-01

    Recent studies conducted in Halden and Studsvik have indicated the possibility of obtaining highly fragmented fuel with relatively low temperatures (700 degree centigrade) and high burned (70 MWd / kgU). In case of accident loss of coolant (LOCA), the expulsion may occur outside the pod fuel fragments, which can affect the coolability, cause channel blockade and therefore an increase in the maximum temperature of sheath.

  2. Evaluacion de la Interaccion Adulto-Nino en Aulas Pre-escolares de Concepcion, Chile. [Evaluation Adult-Child Interaction in Preschool Classrooms of Concepcion, Chile.

    Science.gov (United States)

    Mathiesen De G., Maria Elena; Herrera G., Maria Olivia; Villalon B., Malva; Suzuky S., Emy

    2000-01-01

    Presents findings from investigation of the validity of the Arnett Caregiver Interaction Scale, CIS (1989), in preschools in Concepcion, Chile. Demonstrates the reliability and validity of the scale to evaluate the interaction of the childhood educator with young children, suggesting changes to the scale. Notes differences found for school type.…

  3. Evaluacion comparativa de dos tipos de muestreo en chucheca (Grandiarca grandis y piangua (Anadara tuberculosa, en el Golfo de Nicoya, Costa Rica (ING

    Directory of Open Access Journals (Sweden)

    Juan Bolaños Montero

    2016-03-01

    Full Text Available Se realizó un estudio comparativo para probar la bondad estadística de dos métodos de muestreo de moluscos en el ecosistema de manglar. El muestreo por estratos resultó ser mejor que el muestreo irrestricto al azar.

  4. Evaluation of radiation packages type A from the center of isotopes in Cuba; Evaluacion radiologica de los bultos tipo A del centro de isotopos de Cuba

    Energy Technology Data Exchange (ETDEWEB)

    Balbona, Zayda Amador; Pijuan, Saul Perez, E-mail: zabalbona@centis.edu.cu [Centro de Isotopos (CENTIS), Mayabeque (Cuba); Gual, Maritza Rodriguez, E-mail: mrgual@instec.cu [Instituto Superior de Tecnologias y Ciencias Aplicadas (InSTEC), la Habana (Cuba)

    2013-07-01

    The Isotope Center (CENTIS) of the Republic of Cuba makes the transportation of its products mainly in packaged type A. To undertake the design of packages, packaging components from 6 producing firms (including those found Amersham, CISBIO and IZOTOP) are studied. From the applicable regulations, security features and requirements are established as well as the technical characteristics of the packaging components. This study evaluated according each radioisotope, product and specific activity, high activity that can be included in a Type A package with the limitation that the dose rate on their surfaces is less than or equal to 2 mSv/h. In addition, each package is characterized taking into account the value of the maximum dose rate at maximum contact and the transport index for the day of transport. For this, the Microshield code using version 5.0.3. The dose rate in contact with the package of {sup 90}Y is calculated using the Monte Carlo code MCNPX version 2.6.0. The maximum possible activity values are obtained for each shielding transport radionuclides CENTIS produced, namely {sup 131}I, {sup 125}I, {sup 32}P, {sup 99}Mo/{sup 99m}Tc, {sup 99m}Tc, {sup 188}Re and {sup 90}Y and 69 radioactive packages type A are evaluated.

  5. Estuche de evaluacion del continuo del desarrollo de El Curriculo Creativo (The Creative Curriculum Developmental Continuum Assessment Toolkit for Ages 3-5).

    Science.gov (United States)

    Dodge, Diane Trister; Colker, Laura J.; Heroman, Cate

    Intended for use with the Creative Curriculum for Early Childhood, this integrated ongoing student assessment toolkit, in Spanish, is designed for preschool teachers to help them focus on all aspects of a child's development, thereby giving them a way to ensure that all children in their classes are making progress. The assessment kit uses a…

  6. Uso de los Datos de Biomonitoreo para Informar sobre la Evaluacion Infantil (American translation is: USING BIOMONITORING DATA TO INFORM EXPOSURE ASSESSMENT IN CHILDREN)

    Science.gov (United States)

    Discussing the challenges associated with estimating and interpreting toxicant exposures and health risks from biomonitoring data. This extended abstract was translated in Spanish and published in Acta Toxicologica Argentina.

  7. Physical and chemical properties of pigmented oil obtained from shrimp heads; Evaluacion fisico-quimica de aceite pigmentado obtenido de la cabeza de camaron

    Energy Technology Data Exchange (ETDEWEB)

    Nunez-Gastelum, J. A.; Sanchez-Machado, D. I.; Lopez-Cervantes, J.; Paseiro-Losada, P.; Sendon, R.; Sanchez-Silva, A. T.; Costa, H. S.; Aurrekoetxea, G. P.; Angulo, I.; Soto-Valdez, H.

    2011-07-01

    In this work the proximal analysis, physicochemical characterization, fatty acid profile and astaxanthin content of pigmented oil obtained by fermentation shrimp heads are presented. Lipids are the major components in the oil (95%). The saponification number is 178.62 mg KOH/g, iodine value 139.8 cg iodine/g, and the peroxide value was not detected. Density and viscosity were 0.92 mg/ml and 64 centipoises, respectively. The highest contents of fatty acids were linoleic (C18:2n6), oleic (C18:1n9) and palmitic (C16:0). Eicosapentaenoic acid (C20:5n3, EPA) and docosahexaenoic acid (C22:6n3, DHA) account for 9% of the total. The content of astaxanthin was 2.72 mg/g dry weight. The pigmented oil is a dietary source of nutrients with high value such as astaxanthin. (Author) 45 refs.

  8. Evaluation and tuning of control algorithms for power system stabilizers; Evaluacion y sintonizacion de algoritmos de control para el estabilizador de sistemas de potencia

    Energy Technology Data Exchange (ETDEWEB)

    Ramirez Gonzalez, Miguel

    1998-08-01

    A procedure based on the phase compensation technique for tuning satisfactorily lead-lag power system stabilizers (PSS) is presented in this work. This procedure can be applied to standard models of PSS`s (with two phase compensation stages) where rotor speed deviation or an equivalent rotor speed signal is used as input. An analysis of several state of the art advanced control schemes is also presented, which are proposed for overcoming the limitations of conventional fixed parameters PSS`s. The advantages and drawbacks in designing certain types of PSS`s which are based on adaptive control, fuzzy logic and neural networks techniques are investigated. Based on this study, and taking into account the highly complex and non-linear nature of power systems, a fuzzy logic PSS is designed. In order to have good damping characteristics, speed deviation ({Delta}{omega}) of a machine and its acceleration ({Delta}{omega}) are chosen as the input signals to the fuzzy stabilizer of that particular machine. The performance of the lead-lag PSS and fuzzy stabilizer are validated through the simulation of two case studies: a single machine-infinite bus system, and a multimachine power system. All simulations were performed using a tool based on algorithms developed in MATLAB for the study of power system stability. [Espanol] Se presenta un procedimiento basado en la tecnica de compensacion de fase para ajustar en forma satisfactoria los parametros de los estabilizadores de sistemas de potencia (ESP) del tipo de adelanto-atraso. Este procedimiento es aplicable a modelos estandar de ESP`s (con dos redes de compensacion de fase) que utilizan como senal de entrada la velocidad del rotor del generador en cuestion, o una senal de velocidad equivalente. Por otra parte, se realiza un estudio de diversos esquemas de control avanzado del ESP que se proponen en la literatura actual para superar las limitantes de los estabilizadores convencionales. Basicamente, se analizan las ventajas y desventajas del diseno de ciertos ESP`s basados en tecnicas de control adaptable, logica difusa y redes neuronales artificiales. De los resultados de este estudio y considerando las caracteristicas complejas de los sistemas de potencia, posteriormente se disena y desarrolla un estabilizador basado en teoria de conjuntos difusos que utiliza como senales de entrada el error de velocidad ({Delta}{omega}) de la maquina sincrona y su aceleracion ({Delta}{omega}). Los parametros del ESP de adelanto-atraso y el desempeno del ESP difuso se validan medinte simulaciones en el dominio del tiempo empleando dos escenarios de prueba diferentes: un sistema de potencia maquina-bus infinito y un sistema multimaquina. Todas las simulaciones se efectuan utilizando una herramienta para el estudio de la estabilidad de sistemas de potencia basada en algoritmos desarrollados en MATLAB.

  9. La Didactica de la Lengua y la Literatura orientada a la inclusion: el desarrollo de una prueba de evaluacion de la disfemia

    National Research Council Canada - National Science Library

    Lopez Valero, Amando; Veas Iniesta, Francisco; Lopez Lopez, Maria

    2008-01-01

    .... Dentro del marco teorico que supone la educacion inclusiva se trata de realizar un planteamiento adecuado para, desde la Didactica de la Lengua y la Literatura, tratar de desarrollar una prueba...

  10. EVALUACION DE LA SUSCEPTIBILIDAD A LA EROSION POR EL CAMBIO DE COBERTURA DEBIDO A LA MINERIA, EN EL MUNICIPIO DE ANORI, ANTIOQUIA, COLOMBIA

    National Research Council Canada - National Science Library

    DARNEY DE J CEBALLOS ESPINOSA; LUIS JAIRO TORO R

    2012-01-01

    ... por medio de la utilización de Sistemas de Información Geográfica (SIG) que permitieron la evaluación espacial de las diferentes variables de un modelo basado en la Ecuación Universal de Pérdida del Suelo (USLE...

  11. Predicting and evaluating losses from a drinking water distribution network; Prediccion y evaluacion de perdidas en una red de distribucion de agua potable

    Energy Technology Data Exchange (ETDEWEB)

    Arias Bazan, E.; Pelayo Martin, I.

    1998-06-01

    The ratio m``3 lost/m``3 supplied is a good indicator of the level of non-registered water in a distribution water net. However, this ratio doesn`t give any further information, especially what can be done to improved it. This document explains how it was introduce all the information avalaible in 22 water nets (e.g. pressure, net length, number of subscribers, age of the accountants,...) and using multiple regression methods, identify which variables are significative and moreover obtain an equation that calculates the prospective losses. Besides, these methods can be used to evaluate and compare different water nets, analyzing the discrepancy between real and prospective losses as a result on the effect (los water) of definated causes, that can also be minimized eliminated. (Author)

  12. Estuche de evaluacion del continuo del desarrollo de El Curriculo Creativo (The Creative Curriculum Developmental Continuum Assessment Toolkit for Ages 3-5).

    Science.gov (United States)

    Dodge, Diane Trister; Colker, Laura J.; Heroman, Cate

    Intended for use with the Creative Curriculum for Early Childhood, this integrated ongoing student assessment toolkit, in Spanish, is designed for preschool teachers to help them focus on all aspects of a child's development, thereby giving them a way to ensure that all children in their classes are making progress. The assessment kit uses a…

  13. Uso de los Datos de Biomonitoreo para Informar sobre la Evaluacion Infantil (American translation is: USING BIOMONITORING DATA TO INFORM EXPOSURE ASSESSMENT IN CHILDREN)

    Science.gov (United States)

    Discussing the challenges associated with estimating and interpreting toxicant exposures and health risks from biomonitoring data. This extended abstract was translated in Spanish and published in Acta Toxicologica Argentina.

  14. Evaluacion de la Interaccion Adulto-Nino en Aulas Pre-escolares de Concepcion, Chile. [Evaluation Adult-Child Interaction in Preschool Classrooms of Concepcion, Chile.

    Science.gov (United States)

    Mathiesen De G., Maria Elena; Herrera G., Maria Olivia; Villalon B., Malva; Suzuky S., Emy

    2000-01-01

    Presents findings from investigation of the validity of the Arnett Caregiver Interaction Scale, CIS (1989), in preschools in Concepcion, Chile. Demonstrates the reliability and validity of the scale to evaluate the interaction of the childhood educator with young children, suggesting changes to the scale. Notes differences found for school type.…

  15. Evaluation with CT scans of gas collection in the epidural space. Evaluacion mediante TC de colecciones de gas en el espacio epidural

    Energy Technology Data Exchange (ETDEWEB)

    Rebolledo Vicente, J.; Martinez San Millan, J.; Trujillo Peco, M.; Aunion Diaz, P.; Millan Juncos, J.M. (Hospital Ramon y Cajal. Departamento de Radiodiagnostico. Madrid (Spain))

    1993-01-01

    We present 9 cases of gas collection in the epidural space, revealed in CT scans of the spinal column. Five cases of herniated disc with accompanying vacuum, three of ''aerogen pseudocyst'' and a case of gas introduced iatrogenically via epidural installation catheter are included. (Author)

  16. Multiplicación y evaluacion de recursos fitogenéticos de melón: campaña 2005

    OpenAIRE

    Guerrero Peñalver, Andrés Ramón

    2008-01-01

    Por variación se entiende la existencia de diferencias en cuanto a la forma o función de algún atributo de una especie (variación intraespecífica), es decir, la existencia de diversos fenotipos para un carácter dado entre los individuos de una población o especie. Puede ser debida a causas genéticas o ambientales. No toda la variación es pues heredable. La existencia de diferencias genotípicas potencialmente expresables entre los individuos de una población o especie es la vari...

  17. Uncertainty evaluation in correlated quantities: application to elemental analysis of atmospheric aerosols;Evaluacion de la incertidumbre en cantidades correlacionadas: aplicacion al analisis elemental de aerosoles atmosfericos

    Energy Technology Data Exchange (ETDEWEB)

    Espinosa, A.; Miranda, J.; Pineda, J. C., E-mail: miranda@fisica.unam.m [UNAM, Instituto de Fisica, Circuito de la Investigacion Cientifica s/n, Ciudad Universitaria, 04510 Mexico D. F. (Mexico)

    2010-07-01

    One of the aspects that are frequently overlooked in the evaluation of uncertainty in experimental data is the possibility that the involved quantities are correlated among them, due to different causes. An example in the elemental analysis of atmospheric aerosols using techniques like X-ray Fluorescence (X RF) or Particle Induced X-ray Emission (PIXE). In these cases, the measured elemental concentrations are highly correlated, and then are used to obtain information about other variables, such as the contribution from emitting sources related to soil, sulfate, non-soil potassium or organic matter. This work describes, as an example, the method required to evaluate the uncertainty in variables determined from correlated quantities from a set of atmospheric aerosol samples collected in the Metropolitan Area of the Mexico Valley and analyzed with PIXE. The work is based on the recommendations of the Guide for the Evaluation of Uncertainty published by the International Organization for Standardization. (Author)

  18. Exposition and evaluation of scenarios for the planning of the national power sector; Planteamiento y evaluacion de escenarios para la planeacion del sector energetico nacional

    Energy Technology Data Exchange (ETDEWEB)

    Gutierrez R, Ranulfo; Flores L, Marco P; Gonzalez Santalo, Jose M; Sanchez H, Laura E; Castrejon B, David; Porras L, Gladys L; Lopez A, Esmeralda; Lima R, Deytia [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2006-07-01

    In this article the Model of Optimization of Provision and Distribution of Electricity and Fuels is described, which is the analysis tool used by the responsible national organisms to cover the national demand of fuels and electricity for the accomplishment of studies that provide support elements in the exposition of policies covering the national demands, simultaneously diminishing the cost and reducing the environmental impact. This tool determines the combination of technologies and fuels that imply the smaller cost for the country at the time of covering the energy demands. This document extends on the analytical resources and planning that serve as a base to the Model and on its complements, such as risk estimations facing each investment alternative. All this with the purpose of providing more reliable information to the decision maker group in the matter of energy policies. [Spanish] En este articulo se describe el Modelo de Optimizacion de Suministro y Distribucion de Electricidad y Combustibles, que es la herramienta de analisis empleada por los organismos nacionales responsables de cubrir la demanda nacional de combustibles y electricidad para la realizacion de estudios que proporcionen elementos de apoyo en el planteamiento de politicas que cubran las demandas nacionales, al mismo tiempo que minimicen el costo y reduzcan el impacto ambiental. Esta herramienta determina la combinacion de tecnologias y combustibles que impliquen el menor costo para el pais al momento de cubrir las demandas de energeticos. Este documento amplia sobre los recursos analiticos y planeaciones que sirven de base al modelo y sobre sus complementos, como estimaciones de riesgo frente a cada alternativa de inversion. Todo esto con el fin de suministrar informacion mas confiable al grupo que toma las decisiones en materia de politicas energeticas.

  19. Evaluacion de la toxicidad de Cr+6 , Cu+2 y el efluente de cromado de una industria metalmecánica utilizando panagrellus redivivus como organismo de prueba

    Directory of Open Access Journals (Sweden)

    Nahyr Murillo

    2011-01-01

    Full Text Available Los ensayos de toxicidad son procedimientos en los cuales las respuestas de ciertos organismos acuáticos son utilizadas para detectar el efecto producido por la presencia de sustancias nocivas o tóxicas. Se consideran una herramienta importante de control ambiental, puesto que permitan evaluar de una manera rápida y confiable los impactos de contaminantes tóxicos sobre los ecosistemas, así como evaluar riesgos potenciales de salud. En el presente trabajo se evaluó un bioensayo utilizando como organismo de prueba Panagrellus redivivus, nemátodo que ha mostrado una alta sensibilidad a un gran número de sustancias tóxicas. Se determinó que la CL50-96h para cromo hexavalente fue de 43 mg/l y para sulfato de cobre quelatado de 2,6 mg/l. Aunque la concentración letal, encontrada para estos elementos fue relativamente alta comparada con otros organismos acuáticos, es importante señalar que a concentraciones de 13 mg/l y 0,12 mg/l se observó un efecto significativo sobre el crecimiento y maduración de Panagrellus redivivus. Estos hechos señalaron que los metales evaluados pueden generar efectos subletales, aun a bajas concentraciones. Para el efluente evaluado se encontró que la CL50-96h fue de 1,4%, y concentraciones de 0,4 y 0,005 % producen una disminución en el crecimiento y maduración, respectivamente.

  20. Evaluation of saving measurements and energetic efficiency in air-conditioning systems; Evaluacion de medidas de ahorro y eficiencia energetica en sistemas de climatizacion

    Energy Technology Data Exchange (ETDEWEB)

    Perez Lombard, L [Asociacion de Investigacion y Cooperacion de Andalucia (Spain); Ortiz, J [Building Research Establishment (United Kingdom); Riviere, P [Armines-ecole des mines de Paris (France)

    2006-04-15

    Buildings require an adequate air conditioning to offer workers a labor environment where there is thermal comfort. A study was performed in three different European places which count on several climates. The conclusion was the following: in order to analyze the energy efficiency in edifications it is fundamental the simulation tools use with the purpose of calculating the consumption and evaluating the saving measurements. [Spanish] Los edificios requieren de una climatizacion adecuada para que los que ahi operan puedan hacerlo dentro de un ambiente laboral donde exista el confort termico. Se llevo a cabo un estudio en tres lugares de Europa poseedores de diferentes climas y se concluyo que para poder analizar la eficiencia energetica de climatizacion en las edificaciones es imprescindible el uso de herramientas de simulacion con el proposito de calcular el consumo y evaluar las medidas de ahorro.

  1. Pilot assessment of mercury exposure in selected biota from the lowlands of Nicaragua [Evaluacion piloto de exposicion al mercurio en biota selecta de las tierras bajas de Nicaragua

    Science.gov (United States)

    O.P. Lane; W.J. Arendt; M.A. Torrez; J.C. Gamez Castellon

    2013-01-01

    Methylmercury, a potent neurotoxin, can damage health of humans and wildlife. In 2012, we collected 73 blood and feather samples from birds among diverse foraging guilds to assess mercury exposure in wetland habitats associated with Lakes Managua and Nicaragua. Blood levels (0.72 parts per million) in a piscivorous Neotropic Cormorant Phalacrocorax brasilianus from...

  2. Numerical simulation of diametral compression tests for the evaluation of porous ceramic disks; Simulacion numerica de ensayos de compresion diametral para la evaluacion de discos ceramicos porosos

    Energy Technology Data Exchange (ETDEWEB)

    Sandoval, M. L.; Tomba Martinez, A. G.; Camerucci, M. A.

    2012-11-01

    The mechanical behavior of porous cordierite materials was studied by diametral compression tests. The analytical solution allowing the indirect measuring of the tensile mechanical strength in this load configuration is formulated under certain assumption which may be not satisfied in practice. With the aim to analyze deviations of the ideal conditions, the test was simulated using computational techniques. Porous cordierite disks were prepared by firing (650 degree centigrade, 2h) and reaction-sintering (1330 degree centigrade, 4h) of green disks shaped by thermo gelling the aqueous suspensions of a cordierite precursor mixture (kaolin, talc and alumina) with native potato starch as a consolidator/binder of ceramic particles and a pore former by burn-out at high temperature. The mechanical tests were carried out in displacement control (0.2 mm/min) using a servo hydraulic testing machine. From the apparent stress-strain ratio, the following parameters were determined: mechanical strength, apparent Young modulus and yield stress. Fracture features of tested disks were also analyzed. The influence of the geometrical deviations more usually identified in practice (deviation of the circularity and no parallelism between the plane surfaces of the disk) on the stress distribution was studied by means of the simulation by finite element method, considering the Hertzs equation for contact problems as reference. (Author) 20 refs.

  3. Evaluation of mesopores and characterization of clays of the State of Puebla, Mexico; Evaluacion de materiales mesoporosos y caracterizacion de las arcillas en el Estado de Puebla, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez, M.A.; Velasco, J.A. [Departamento de Investigaci en Zeolitas, Instituto de Ciencias de la Universidad Autonoma de Puebla. Edif. 76, Complejo de Ciencias, C. U., San Manuel, Puebla 72570 Puebla (Mexico); Rojas, F.; Lara, V.H. [Departamento de Quimica, Universidad Autonoma Metropolitana-Iztapalapa. Apartado Postal 55-434, M ico, D.F. (Mexico); Salgado, M.A. [Facultad de Ciencias Quimicas, Universidad Autonoma de Puebla (Mexico); Tamariz, V. [Posgrado de Ciencias Ambientales, Instituto de Ciencias de la Universidad Autonoma de Puebla (Mexico)

    2003-07-01

    The crystalline properties of natural clays are related to the different crystallographic phases that are present in the structure of these substrates. Clays from the zone of Tehuacan, in the state of Puebla, Mexico, have been studied by means of X-Ray Diffraction (XRD), Atomic Absorption (AA), and N{sub 2} Adsorption at 76 K. XRD analysis indicates the presence in the clay adsorbents of montmorillonite, quartz and, in some cases, of calcium carbonate. The textural properties of these porous materials of natural origin have been evaluated through the BET equation, the Langmuir equation, the single point BET method and the Gurvitsch Rule. The meso porosity that is present in each substrate has been measured via the methods of Kelvin, Barret, Jovner, and Halenda (BJH), and Kruk, Jaroniec, and Sayari as well as by the so-called differential curves of t-plots. The N{sub 2} adsorption isotherms at 76 K that were measured on our clay adsorbents indicate that the adsorption process is carried out through a multilayer formation mechanism. The sorption hysteresis loops confirm characteristic aspects of this type of clay materials. Plots of the adsorbed volume versus the statistical thickness (t-plots) of N{sub 2} layers adsorbed on the clay surface were also evaluated. The latter curves comprise three zones of behavior; each zone representing a different filling mechanism of the pore space. (Author)

  4. EVALUACION DE METODOLOGÍAS PARA EL ANALISIS DE PRODUCTOS TÓXICOS DE LA DEGRADACIÓN DE FUNGICIDAS DITIOCARBAMATOS

    Directory of Open Access Journals (Sweden)

    Jairo Arturo Guerrero

    2013-11-01

    Full Text Available Se evaluaron cuatro metodologías para la determinación de etilentiourea y propilentiourea en frutas y hortalizas; se seleccionó y optimizó un método de extracción utilizando una mezcla metanol:agua 3:1 y posterior limpieza con partición liquido-líquido soportada sobre extrelut. La determinación y cuantificación se llevó a cabo utilizando cromatografía liquida de alta eficiencia con detección de arreglo de diodos. La metodología validada es específica y selectiva, con porcentajes de recuperación entre 77,82% y 83,57%, coeficientes de variación menores al 20% y límites de detección entre 0,003 y 0,006 mg.kg-1. Los parámetros estadísticos de linealidad mostraron resultados adecuados en los rangos de concentración evaluados. La metodología es robusta para las variables evaluadas y no se observó efecto matriz. Se encontraron trazas de etilentiourea y propilentiourea en una muestra de tomate y una muestra de papa, respectivamente.

  5. Economical evaluation of two public policies regarding water pollution control; Evaluacion economica de dos politicas publicas para controlar la contaminacion del agua

    Energy Technology Data Exchange (ETDEWEB)

    Gutierrez-Andrade, Miguel Angel [Universidad Autonoma Metropolitana-Iztapalapa (Mexico); Bravo-Perez, Hector Manuel [Centro de Investigacion y Docencia Economica (Mexico)

    2006-01-15

    Since Pigou proposed that the internalization of the negative externalities could be done calculating a tax in order to correct the difference between private costs and social costs; this will recover the conditions of economic efficiency in all the hydraulic legislations of the world, however, this advice has been applied in conditions of great shortage; it could be thought that to burden the consumptive use could be more suitable than to burden the production of residual water reaching this way not only the recovering of social efficiency but also a double dividend: to stimulate the water recycling. This work evaluates the effect that the tax to the consumptive use will have over a fake economy. The achieved results are compared using data from two economies with a different water production each one. The contrast is done using a model of computable general equilibrium with the Arrow-Debreu assumptions relaxed with the introduction of a government that collect the proposed taxes in a previously distorted economy. The collection distributes through a direct transference to the revenue of the consumers, the model calibrates and resolves following the methodology proposed by Shoven and Whalley (1984). [Spanish] Desde que Pigou propuso que la internalizacion de las externalidades negativas podria hacerse a traves de un impuesto que corrigiera la diferencia entre costos privados y costos sociales -de forma tal que se recuperaran las condiciones de eficiencia economica-, practicamente en todas las legislaciones hidraulicas del mundo se ha aplicado esta recomendacion; sin embargo, en condiciones de gran escasez de agua podria pensarse que gravar la cantidad de agua incorporada definitivamente al producto final, el uso consuntivo, podria ser mas adecuado que gravar la produccion de agua residual, pues asi se lograria, ademas de recuperar las condiciones de eficiencia social, un doble dividendo: incentivar el reciclaje del agua. En este trabajo se evalua el efecto que el cobro de un impuesto al uso consuntivo y a la produccion de agua residual tendria sobre una economia simplificada. Los resultados obtenidos se contrastan utilizando informacion de dos economias con dotaciones de agua muy diferentes. La comparacion se hace utilizando un modelo de equilibrio general computable del tipo Arrow-Debreu, considerando un gobierno que recauda los impuestos propuestos en una economia previamente distorsionada y distribuye la recaudacion via una transferencia directa al ingreso de los consumidores. El modelo se calibra y se resuelve siguiendo la metodologia propuesta por Shoven y Whalley (1984).

  6. Evaluacion de los recursos potenciales del petroleo y gas, en Centro y Suramerica [Evaluation of potential petroleum and gas resources in Central and South America

    Science.gov (United States)

    Schenk, C.S.

    2001-01-01

    El Servicio Geológico de los Estados Unidos (USGS, por sus siglas en inglés) completó recientemente un estudio evaluativo de recursos potenciales de petróleo y gas en 130 provincias de petróleo seleccionadas en diferentes partes del mundo (USGS, 2000). De estas 130 provincias, 23 se encuentran en Suramérica, Centroamérica, y la región del Caribe (fig. 1). El estudio comprendió desde las provincias de petróleo establecidas con un largo historial de producción, como la Cuenca de Maracaibo, hasta las provincias fronterizas de poca o ninguna producción, como la Cuenca de Guyana-Suriname. No todas las provincias con historial de producción o con potencial de producción fueron evaluadas en el Estudio Evaluativo USGS 2000. Al presente, el USGS está evaluando muchas de las provincias restantes de petróleo y gas, en Centro y Suramérica. En cada provincia hemos (1) definido geológicamente el total de los sistemas de petróleo, (2) definido las unidades evaluadas que forman parte de todos los sistemas de petróleo, y (3) evaluado el volumen potencial de petróleo y gas convencional en cada unidad evaluada. Definimos un total de 26 sistemas de petróleo y 55 unidades evaluadas en las 23 provincias

  7. Evaluation of operational incidents in the research reactor RP-10 according to scale INES; Evaluacion de incidentes operacionales en el reactor de investigacion RP-10 segun escala INES

    Energy Technology Data Exchange (ETDEWEB)

    Arrieta, Rolando W.B.; Vela Mora, Mariano, E-mail: rarrieta@ipen.gob.pe, E-mail: mvela@ipen.gob.pe [Instituto Peruano de energia Nuclear, Lima (Peru). Dept. de Operacion de Reactores

    2013-07-01

    This report presents the evaluation of the events in 2011 in the RP-10 Nuclear Reactor Nuclear Center Huarangal from the point of view of safety. To classify these events produced is used Scale International Nuclear and Radiological Event Scale (INES) to facilitate a common understanding between the technical community, the media and the general public. From the results we can say that in 2011 all related to security events that occurred in the RP -10 are classified as 'below scale' or no safety significance. (author)

  8. La quiebra del clasicismo en la critica moderna y contemporanea: analisis de la evaluacion de la poesia de Juan Melendez Valdes

    National Research Council Canada - National Science Library

    Sanchez-Llama, Inigo

    2014-01-01

    ... modernos de sus composiciones poeticas. The evolution of critical judgments of the poetry of Juan Melendez Valdes (1754-1817) must take into account the impact of Romanticism in the nineteenth-century literature. Melendez Valdes' poetry--a representative example of the values of the Spanish Enlightenment--suffers a critical devaluation not only bec...

  9. Activities for turbine maintenance: planning, implementation and evaluation of inspection results; Actividades para el mantenimiento de la turbina: planificacion, ejecucion y evaluacion de resultados de las inspecciones

    Energy Technology Data Exchange (ETDEWEB)

    Azcue, J.; Sanchez, M. A.; Alvaro, M.

    2014-04-01

    The article will cover the most significant aspects of how Tecnatom carry out the turbine maintenance work, both from the point of view of the inspection itself as the pre-and post tasks associated. Thus, the issues that will be part of the article are the Manual Inspection Service (MISI) and the inspection database, ISI WEB. These tools are essential for planning field work and serve as a guide to run later turbine inspections in different plants. Following this introduction the inspection teams and the techniques used by Tecnatom will be described. finally, the article will contain a small mention about management studies of life and integrity analysis of the turbine that can be performed, as well as involvement in its safe operation that is derived from them. Ultimately, the intention is to provide a comprehensive approach to the issue in question, the turbine maintenance work, so that the reader can get an ideal of the whole process. (Author)

  10. CONSTRUCCIÓN, GESTION Y EVALUACION DEL CONOCIMIENTO DESDE LA PRÁCTICA PROFESIONAL: ANÁLISIS DESDE EL TRABAJO SOCIAL

    Directory of Open Access Journals (Sweden)

    Enrique Pastor Seller

    2013-11-01

    Full Text Available El artículo profundiza en las contribuciones de la formación en competencias que ha supuesto la creación del Espacio Europeo de Educación Superior y en las aportaciones que ha supuesto la integración del Grado en Trabajo Social en España. Se presenta de manera sistemática los resultados de una investigación acerca de los ámbitos de actuación profesional y las capacidades, habilidades y destrezas que el estudiante adquiere en las prácticas profesionales en organizaciones sociales. Un complejo e integrado mapa competencial que proporciona al alumnado un aprendizaje sistemático desde y para la práctica profesional que le permite construir, gestionar y evaluar un conocimiento valioso desde la propia experiencia. Un conocimiento aplicado que se convierte en un capital científico y profesional intangible que dota de autonomía y desarrollo al estudiante para enfrentarse con éxito al entorno profesional y laboral.

  11. EVALUACION DE LAS CONDICIONES EN QUE DESEMPEÑAN SUS FUNCIONES ADMINISTRATIVAS Y PEDAGOGICAS LOS PROFESORES ENCARGADOS DE SIETE ESCUELAS MULTIGRADO MUNICIPALES DE LA COMUNA DE NACIMIENTO

    OpenAIRE

    2012-01-01

    La presente investigación se enmarca en el paradigma cualitativo. El método utilizado fue el Estudio de Caso. Como estrategia de diseño de la investigación, permitió centrarse en el fenómeno concreto que son las escuelas multigrado, con el objetivo de evaluar las condiciones en que los profesores encargados desempeñan sus funciones administrativas y pedagógicas. El estudio se realizó considerando una muestra no probabilística intencionada de profesores encargados de siete escuelas rurales ...

  12. Preliminary evaluation of thermal and nonthermal waters at selected sites in Panama, Central America. Evaluacion preliminar de aguas termales y no termales de sitios seleccionados en Panama, Centroamerica

    Energy Technology Data Exchange (ETDEWEB)

    Shevenell, L.

    1989-11-01

    Thirty-one thermal and nonthermal water samples were collected in Panama by the Instituto de Recursos Hidraulicos y Electrificacion and analyzed by the Earth and Space Sciences Division at Los Alamos National Laboratory to evaluate the geothermal potential of four different areas. Chemical and isotopic analyses were performed on each sample. Because samples from several areas were submitted, the chemistry of the samples is varied, with total dissolved solids of thermal fluids ranging from 900 to nearly 10,000 mg/{ell}. All water samples studied are meteoric in origin, and none of the thermal waters exhibit an {sup 18}O enrichment, which is characteristic of high-temperature isotopic, exchange between water and rock. At all four areas, calculated geothermometer temperatures within a reservoir of less than 160{degrees}C. 4 refs., 4 figs., 6 tabs.

  13. Desarrollo de herramientas para evaluaciones ópticas y guía de introducción al laboratorio de metrología de paneles

    OpenAIRE

    2012-01-01

    Trabajo realizado para mejorar el proceso de evaluación de paneles para receptores de televisión mediante un software de medida automática. [ANGLÈS] The target of this project is the development of software tools for optical evaluation of display panels (and/or television devices) in the Display Metrology Lab at Sony R&D facilities in Viladecavalls. The core of this software is a command console ready to parse scripts containing instructions for several cameras and generator used for the o...

  14. EVALUACION EN EL CORTO PLAZO DEL IMPACTO DE UNA INTERVENCION BASADA EN EL JUEGO EN UN GRUPO DE NIÑOS CON DIFICULTADES LECTORAS

    OpenAIRE

    ESCOBAR TORRES, JOSE PABLO

    2010-01-01

    Esta investigación evaluó la eficacia de un programa de intervención basado en el aprendizaje implícito como una alternativa de tratamiento a las dificultades lectoras de niños de escuelas públicas que viven en zonas pobres de Santiago. El grupo experimental, conformado por 56 niños identificados con dificultades lectoras asistieron a actividades lúdicas para implícitamente promover y abordar las habilidades lectoras necesarias en el contexto del programa Niños Sin Fronteras, mientras q...

  15. Evaluation of physicochemical parameters influencing bulking episodes in a municipal WWTP; Evaluacion de la influencia de los parametros fisicoquimicos en los episodios de bulking en una EDAR muncipal

    Energy Technology Data Exchange (ETDEWEB)

    Bayo, J.; Angosto, J. M.; Serrano-Aniorte, J.; Lopez-Castellanos, J.; Puerta, J.

    2009-07-01

    A study of physicochemical parameters in a municipal wastewater treatment plant (WWTP) was undertaken over 12-month period, to consider the presence of bulking phenomena by means of statistical and logistic regression analyses. the WWTP is situated in Cartagena, Southeast of Spain, with domestic and industrial wastewater contributions, and a mean flow rate of 27,000 m{sup 3}/day. (Author) 28 refs.

  16. La no neutralidad en la evaluacion de la calidad y modelos de evaluacion de la educación superior, casos de: Colombia, Argentina y Brasil Neutrality in quality evaluation and in models of higher education evaluation: the cases of Colombia, Argentina and Brazil

    Directory of Open Access Journals (Sweden)

    Nina Eleonor Vizcarra Herles

    2011-07-01

    Full Text Available En este artículo en base al análisis documental y de la literatura del área se aborda el tema de la no neutralidad de la evaluación de la calidad, se exploran dimensiones en el concepto de calidad proponiendo un modelo comprensivo, se identifican factores que contribuyen a la no neutralidad del concepto en referencia a las instituciones universitarias. Se enfatiza en que los elementos de referencia considerados valiosos para el evaluador (modelo de referencia comunican características diferenciales a los modelos de evaluación institucional y de programas para educación superior haciendo mención a los casos de Colombia, Argentina y Brasil y se analizan las diversas implicancias en su funcionamiento. Se infiere que contribuyen a la no neutralidad de la evaluación de la calidad: el énfasis conceptual en alguna o algunas dimensiones de la calidad, el propósito que es de interés del evaluador, el cual determina el referente de calidad a utilizar, y las demandas de calidad endógenas y exógenas a la institución, programa o sistema que es objeto de evaluación.This article founded on documental analysis as well as on analysis of the literature in the field, addresses the issue of non-neutrality of quality assessment; it discusses dimensions of the quality concept, identifies factors that contribute to the non-neutrality of quality in reference to universities. It emphasizes that the benchmarks that are considered valuable to the evaluator (reference model, give different characteristics to the institutional and program evaluation models for higher education, making reference to the cases of Colombia, Argentina and Brazil and discusses the different implications of its operation. It is inferred that what contributes to the non-neutrality of quality assessment are: the conceptual emphasis on one or on several quality dimensions, the purpose of the evaluator, which determines the quality benchmarks he uses, and the demands for quality which are endogenous or exogenous to the institution, program or system that is under evaluation.

  17. La no neutralidad en la evaluacion de la calidad y modelos de evaluacion de la educación superior, casos de: Colombia, Argentina y Brasil Neutrality in quality evaluation and in models of higher education evaluation: the cases of Colombia, Argentina and Brazil

    National Research Council Canada - National Science Library

    Nina Eleonor Vizcarra Herles; Edwin Guido Boza Condorena; Elisabete Monteiro de Aguiar Pereira

    2011-01-01

    ... evaluación de la calidad, se exploran dimensiones en el concepto de calidad proponiendo un modelo comprensivo, se identifican factores que contribuyen a la no neutralidad del concepto en referencia a las...

  18. Ejercicio interlaboratorio de bioensayos marinos para la evaluacion de la calidad ambiental de sedimentos costeros en Espana. II Ensayo de inhibicion dela bioluminiscencia para la evaluacion rapida de la toxicidad de sedimentos = Interlaboratory assessment of marine bioassays to evaluate the environmental quality of coastal sediments in Spain. II. Bioluminescence inhibition test for rapid sediment toxicity assessment

    NARCIS (Netherlands)

    Casado-Martinez, M.C.; Campisi, T.; Diaz, A.; Re, Lo R.; Obispo, R.; Postma, J.F.; Riba, I.; Sneekes, A.C.; Buceta, J.L.; DelValls, T.A.

    2006-01-01

    The Microtox (R) bioassay was tested in an interlaboratory study to evaluate the variability when using solid-phase samples. The exercise consisted of two consecutive phases each one carried out with six sediment samples from Spanish ports. Phase I included six laboratories that reported results for

  19. Ejercicio interlaboratorio de bioensayos marinos para la evaluacion de la calidad ambiental de sedimentos costeros en Espana. II Ensayo de inhibicion dela bioluminiscencia para la evaluacion rapida de la toxicidad de sedimentos = Interlaboratory assessment of marine bioassays to evaluate the environmental quality of coastal sediments in Spain. II. Bioluminescence inhibition test for rapid sediment toxicity assessment

    NARCIS (Netherlands)

    Casado-Martinez, M.C.; Campisi, T.; Diaz, A.; Re, Lo R.; Obispo, R.; Postma, J.F.; Riba, I.; Sneekes, A.C.; Buceta, J.L.; DelValls, T.A.

    2006-01-01

    The Microtox (R) bioassay was tested in an interlaboratory study to evaluate the variability when using solid-phase samples. The exercise consisted of two consecutive phases each one carried out with six sediment samples from Spanish ports. Phase I included six laboratories that reported results for

  20. Cisto de colédoco em adulto: anomalia da junção do colédoco com o ducto pancreático submetido à ressecção do cisto e à derivação biliar e pancreática Common bile duct cyst in adult: anomaly of the common bile duct-pancreatic junction submitted to excision of the cyst and a biliary and pancreatic deviation

    Directory of Open Access Journals (Sweden)

    Manlio Basilio Speranzini

    2008-04-01

    Full Text Available Common bile duct cysts are rare congenital anomalies which have been diagnosed only in twenty per cent of adults. The etiology is uncertain, but many patients have an anomalous pancreatobiliary junction anatomy. We present a case of a young man with a type I Alonso-Lej/ Todani common bile duct cyst and an anomalous common bile duct-pancreatic junction anatomy. Because the common bile duct did not have a segment of normal caliber, to avoid compromising with the pancreatic channel after the excision of the cyst, we performed a Roux-en-Y anastomosis by anastomosing the biliary duct to the proximal excluded jejunal loop and the common duct-pancreatic junction to the same more distally loop.

  1. Entendiendo el manejo medico de la enfermedad arterial periferica de los miembros inferiores.(Articulos de revision)(Perspectiva general de la enfermedad/trastorno)

    National Research Council Canada - National Science Library

    Murillo, Natalia; Hiller, Heinz; Ulloa-Dominguez, Jorge; Ulloa, Jorge Hernando

    2010-01-01

    ... (adenosin monofosfato), Cilostazol. Esta revision se enfoca en las recomendaciones actuales para la evaluacion clinica, la aproximacion diagnostica y el tratamiento medico de pacientes con la enfermedad...

  2. Identificacion y valoracion neuropsicologica del riesgo perinatal: intumentos

    National Research Council Canada - National Science Library

    Lopez-Gomez, Santiago; Cajal-Cernuda, Carlos Jose; Ordonez-Blanco, Sonia Ma; Uribe-Rodriguez, Ana Fernanda

    2008-01-01

    .... En el presente articulo se identifican los principales factores asociados al riesgo perinatal y sus implicaciones, haciendo un recorrido por los procedimientos estandarizados de evaluacion del riesgo...

  3. Perfiles neuropsicologicos: enfermedad de Alzheimer y Parkinson, deterioro cognitivo leve, trastorno depresivo mayor y envejecimiento

    National Research Council Canada - National Science Library

    Miranda, Ana; Pruvost, Marlene; Gonzalez Palau, Fatima; Rimoldi, Maria Florencia; Viale, Magdalena; Caceres, Magdalena

    2015-01-01

    La evaluacion neuropsicologica consiste en un instrumento que posibilita la descripcion de aquellos aspectos conservados o afectados en las distintas areas de funcionamiento cognitivo de una persona...

  4. Comparative analysis of the evaluation of the intrinsic vulnerability in carbonate aquifers (Canete Mountain Range, province of Malaga); Analisis comparativo de la evaluacion de la vulnerabilidad intrinseca de acuiferos carbonaticos (Sierra de Canete, provincia de Malaga)

    Energy Technology Data Exchange (ETDEWEB)

    Jimenez Madrid, A.; Carrasco Cantos, F.; Martinez Navarrete, C.

    2009-07-01

    Groundwater of the carbonate aquifers of Canete Mountain Range constitute a basic source for water supply to different populations. Vulnerability intrinsic assesment is one of the most useful tools for the protection of the groundwater bodies, for this reason, this area has been chosen, to realize a comparative analysis, by means of the use of tools of spatial analysis and technical statistics of a Geographical Information System. In this work, Reduced DRASTIC, COP and RISK method have been applied, due to the fact that they are the methods used by Spain, both first ones, to evaluate the vulnerability of the groundwater bodies in the inter communal basins of the whole national territory, and for BRGM of France, the last one, to approach the carbonate aquifers protection. The obtained results show as the COP and RISK methods, specifics of carbonate aquifers, there show results more according to the characteristics of Canete Mountain Range that the obtained ones with Reduced DRASTIC, which unsaturated zone valuation causes an undervaluing the results of vulnerability obtained. (Author) 35 refs.

  5. 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)

  6. Evaluation of used vegetable oil for biogas production in Spain; Evaluacion del potencial de aceite vegetal usado para la obtencion de biogasoleo en la Comunidad de Castilla y Leon

    Energy Technology Data Exchange (ETDEWEB)

    Antolin, G.; Tinaut, F. V.; Saez, A. R.; Vegas, L.; Briceno, Y. [Universidad de Valladolid (Spain)

    2002-07-01

    This work studies the potential of the residual vegetal oil that is generated in the Community of Castilla and Leon, evaluating the one that could be destined for the production of biogas. Also, it sets out a management model that will allow to establish a suitable collection and processing of this oil. (Author) 10 refs.

  7. Conformation of an evaluation process for a license renovation solicitude of a nuclear power plant in Mexico; Conformacion de un proceso de evaluacion para una solicitud de renovacion de licencia de una central nuclear en Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Serrano R, M. L., E-mail: mlserrano@cnsns.gob.mx [Comision Nacional de Seguridad Nuclear y Salvaguardias, Dr. Barragan No. 779, Col. Narvarte, 03020 Mexico D. F. (Mexico)

    2012-10-15

    So that the construction stages, of operation, closing, dismantlement and the radioactive waste disposal of a nuclear power plant (NPP) are carried out in Mexico, is necessary that the operator has a license, permission or authorization for each stage. In Mexico, these licenses, permissions or authorizations are granted by the Energy Secretariat with base in the verdict of the Comision Nacional de Seguridad Nuclear y Salvaguardias (CNSNS). The operation licenses ar the moment effective for the reactors of the Nuclear Power Plant of Laguna Verde (NPP-L V) they will expire respectively in the year 2020 and 2025 for the Unit 1 and Unit 2, for what the CNSNS has begun its preparation before a potential solicitude of the licensee to continue the operation of the NPP-L V. Defining the process to continue and to generate the documents that would help in this phase as normalization, guides, procedures, regulations, controls, etc., is the task that intends to be carried out the regulator body so that the evaluation process is effective and efficient, so much for the same regulator body as for the licensee. This work exposes the advance that the CNSNS has in this aspect and is centered specifically in the conformation of an evaluation process of license renovation solicitude, taking as base what the regulator body of the United States of North America (US NRC) established and following to the IAEA. Also, this work includes statistical of electric power production in Mexico, licensing antecedents for the NPP-L V, a world perspective of the license renovations and the regulation of the US NRC related to the license renovation of a NPP. (Author)

  8. Intervention levels in a precocious detection program for breast cancer and evaluation of four participant units; Niveles de intervencion en un programa de deteccion precoz del cancer de mama y evaluacion de cuatro unidades participantes

    Energy Technology Data Exchange (ETDEWEB)

    Carrera M, F.; Velazquez M, S.; Manzano M, F.J.; Sanchez S, J. [Hospital `Juan Ramon Jimenez` Ronda Norte s/n 21005. Huelva, Espana (Spain)

    1998-12-31

    It is presented the basis to make a cost benefit analysis for a breast cancer precocious detection program and consequently the keys for its optimization from the radiological point of view. Taking this as a reference it is made an exhaustive quality control to four mammographic unities which were participating or they were candidates to participate in a breast cancer precocious detection program. Also it is presented its results. It is followed the protocol for quality control in mammography in Spain obtaining values for the measurement of twelve interesting parameters. It should be maintained the standard breast dose about 1 mGy/ image. It should be available a 24 x 30 cm portacassete and considering the utilization of a single projection by breast. (Author)

  9. Experimental evaluation of thermal behaviour in five passive Solar prototype in Indiana (USA); Evaluacion experimental del comportamiento termico de cinco estrategias diferentes de calentamiento pasivo en Indiana. Estados Unidos

    Energy Technology Data Exchange (ETDEWEB)

    Fernandez, A. G.

    2004-07-01

    This article presents the experimental results obtained in five passive solar prototypes (i.e. Roofpond, Sunspace, Water-Wall, Trombe-Wall, and Direct Gain) in Muncie, Indiana, during the period between December of 2002 and May of 2003. The results of this study demonstrate that the Roofpond prototype produces the most thermally-stable conditions, having a diurnal maximum variation of the operative temperature (monthly average) of 2.6 C. The Roofpond and Water-Wall prototypes had the highest operative temperatures during the nighttime. During daytime, the Water Wall and Direct Gain prototypes had the highest operative temperatures, with Direct Gain being the only strategy that presented serious overheating problems during clear days. (Author)

  10. Report of results of the tests of evaluation of the operation of service of personal dosimetry of the CNLV; Informe de resultados de las pruebas de evaluacion del funcionamiento de servicio de dosimetria personal de la CNLV

    Energy Technology Data Exchange (ETDEWEB)

    Alvarez R, J.T.; Tovar M, V.M. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    2005-11-15

    The ININ realized the evaluation of the service of personal dosimetry in the CNLV, in the categories: IV.- (Photons of high energy of {sup 137}Cs) and the VA.- (Particles beta of {sup 90}Sr/{sup 90}Y); in the category IV the test was satisfactory, however in the chart 1 has an underestimation a the American Standard HP over the value true conventional of a 9%; for this irregularity it is recommended to revise the procedures of evaluation of the process and the determination of the chart 1 of the HP. In the category VA, the test is also satisfactory, however the results contrasted with the chart 2 and the HP, the values were overestimated in 29% of the true conventional value, and for that problem is recommended to revise the evaluation procedures in contrast with the values determined by the standard HP. (Author)

  11. Evaluation of nickel-rich alloys for the electrolytic generation of hydrogen in an alkaline medium; Evaluacion de aleaciones ricas en niquel para la generacion electrolitica de hidrogeno en medio alcalino

    Energy Technology Data Exchange (ETDEWEB)

    Ortiz Verdin, A.A.; Ortega Borges, R.; Trejo Cordova, G.; Meas Vong, Y. [Centro de Investigacion y Desarrollo Tecnologico en Electroquimica, S.C., Pedro Escobedo, Queretaro (Mexico)]. E-mail: aortiz@cideteq.mx

    2009-09-15

    The simultaneous electrodeposition of Ni with metals such as Zn to form alloys enables obtaining surfaces with high electrocatalytic activity or particular characteristics that resist wear and abrasion. This work presents the results of the study of the electrochemical characterization of different types of nickel electrodeposition and compositions, used as cathodes, and measurements of the electrocatalytic activity in the release of hydrogen in an alkaline medium. Curves I through IV were generated, which were potentiostatically obtained in a nitrogen atmosphere in a NaOH alkaline solution. The morphology of the deposits was evaluated with sweep electron micrscopy(SEM). The results enabled evaluating its potential application as electrode materials for the generation of electrolytic hydrogen in alkaline medium, given the good electrocatalytic activity of nickel-rich materials. [Spanish] El electrodeposito simultaneo del Ni, con metales como el Zn para formar aleaciones, permite obtener superficies con elevada actividad electrocatalitica o con caracteristicas particulares de resistencia al desgaste y abrasion. En este trabajo se presentan los resultados del estudio de la caracterizacion electroquimica de los electrodepositos a base de niquel de diferente naturaleza y composicion utilizandolos como catodos midiendo la actividad electrocatalitica con respecto a la reaccion de desprendimiento de hidrogeno (RDH) en medio alcalino. Se realizaron curvas I vs V obtenidas potenciostaticamente bajo atmosfera de nitrogeno en una solucion alcalina de NaOH. La morfologia de los depositos se evaluo mediante SEM (microscopio electronico de barrido). Los resultados permiten evaluar su potencial aplicacion como materiales de electrodo para la generacion electrolitica de hidrogeno en medio alcalino, dada la buena actividad electrocatalitica de los materiales ricos en niquel.

  12. Evaluation of Contrast MR Angiography in the Study of Internal Carotid Artery Stenosis. Systematic Review of the Literature; Evaluacion de la estenosis de la arteria carotida interna por angiografia REM con contraste: revision sistematica de la bibliografia

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez Perez, P.; Martinez Cantarero, J. [Hospital Universitario 12 de Octubre. Madrid (Spain); Ruiz Diaz, M.; Blazquez Morera, J. A. [Universidad Autonoma de Madrid (Spain); Llano Senaris, J. E. de [Fundacion Gaspar Casal. Madrid (Spain)

    2004-07-01

    To evaluate the diagnostic benefit of using contrast MR Angiography (MRA) in the study of extracranial internal carotid artery stenosis as opposed to intraarterial digital subtraction arteriography (LADSA). A search for relevant articles from 1990 to 2000 using MDLINE and EMBASE databases. Initial selection criteria: 1. articles which compare MRA and IADSA in the study of extracranial internal carotid artery stenosis; and 2, sample size of 10 or more subjects. Studies employing contrast MRA were subsequently selected. Contrast MRA diagnostic results were studied, as were those of non-contrast MRA (TOF) if included. Roc curves and 95% confidence intervals were calculated. In the studies, 324 patients and 648 extracranial internal carotid arteries were evaluated (12 articles). The diagnostic results in carotid artery stenosis discrimination using contrast MRA as opposed to IADSA were sensitivity and specificity=97.28% and 96.08%. With regard to contrast MRA vs. non-contrast MRA (TOF), significant differences favoring contrast MRA in both sensitivity and specificity were observed. (p=0.08 and p<0.001, respectively). MRA techniques demonstrate very high diagnostic capabilities in the detection of carotid stenosis, with contrast MRA being more effective than non-contrast. MRA. In spite of not being superior to IADSA, given the morbimortality risk which the latter is associated (0.7-1.2%). many authors defend contrast MRA (in association with Doppler echography) having become the method of choice for presurgical study of extracranial internal carotid artery stenosis. (Author) 53 refs.

  13. Influence of vegetation in the energetic balance outdoor urban spaces: Analysis and evaluation of its microclimatic effect; Influencia de la vegetacion en el balance energetico de los espacios exteriores urbanos: Analisis y evaluacion de sus efectos microclimaticos

    Energy Technology Data Exchange (ETDEWEB)

    Ochoa, J. Manuel [Universidad de Sonora, Hermosillo, Sonora (Mexico); Roset, Jaume [Universidad Politecnica de Cataluna, Barcelona (Spain)

    2000-07-01

    We present design guidelines to detect and to control the energy fluxes within and urban space. The main purpose is to create outdoor spaces with appropriate comfort conditions and to improve energy efficiency of adjacent buildings, by modifying its surrounding areas, approaching outdoor environment to the desired indoor conditions. The design guidelines as well as the concepts developed on this paper are explained in a language familiar to architects, urban planners and landscape designers, which have to take energetic and bioclimatic decisions up the first stage of a project process. A case study analysis of an urban scenery is presented, and conclusions about the advantage of using the vegetation as an instrument of microclimatic control are given. [Spanish] En este articulo se presentan pautas de diseno, que estan encaminadas, a saber detectar y en caso necesario reconducir, los flujos de energia dentro del espacio urbano. El proposito es crear espacios exteriores, con condiciones de confort ambiental, adecuadas a los usuarios de dicho espacio y por otro lado, mejorar la eficiencia energetica de los edificios, al modificar su entorno inmediato. Tanto las pautas de diseno, como los conceptos desarrollados en este trabajo, estan explicados con un discurso orientado al lenguaje de los profesionales dedicados al diseno urbano, arquitectonico y del paisaje, que son quienes deben hacer las consideraciones energeticas y bioclimaticas, desde las primeras etapas de un proyecto. Finalmente se presenta el ejemplo de un escenario urbano, donde se han realizado mediciones de los parametros climaticos, analizando cualitativa y cuantitativamente la influencia de la vegetacion y otros elementos del paisaje urbano sobre el microclima, y se dan conclusiones sobre la conveniencia de utilizar la vegetacion como un instrumento para el control microclimatico en los espacios exteriores urbanos.

  14. Evaluation of ion exchange resins for iron control in copper electro-winning solutions; Evaluacion de resinas de intercambio ionico para el control de hierro en soluciones de electro-obtencion de cobre

    Energy Technology Data Exchange (ETDEWEB)

    Parada, F.; Dreisinger, D.; Wilkomirsky, I.

    2010-07-01

    Two commercial resins were evaluated for the extraction of iron from a copper electrowinning solution. Both resins efficiently extract iron. The Mono phosphonic resin has a greater charge capacity than the Diphonix resin and the Diphonix resin shows faster kinetics. Experimental results of the interrupted test and tests with different particle size of resins have demonstrated that extraction kinetics is controlled by diffusion into the particle in both resins. A good agreement with Fick's model for diffusion inside the particles confirms the proposed mechanism. Finally, temperature favors the process kinetics and its effect on the diffusion coefficient follows Arrhenius law, obtaining a value of 4,89 kcal/mol for the Mono phosphonic resin and 4,94 kcal/mol for the Diphenox resin. The aforementioned values are close to typical values for the proposed diffusional control which are 6 to 10 kcal/mol. (Author)

  15. Evaluation of radiochromic films EBT3 for in-vivo dosimetry in radiotherapy treatments with photons; Evaluacion de peliculas radiocromicas EBT3 para dosimetria in vivo en tratamientos de radioterapia con fotones

    Energy Technology Data Exchange (ETDEWEB)

    Galvan de la C, O. O.; Rivera M, T. [IPN, Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Av. Legaria No. 694, Col. Irrigacion, 11500 Mexico D. F. (Mexico); Garcia G, O. A.; Larraga G, J. M., E-mail: olinca@ciencias.unam.mx [Instituto Nacional de Neurologia y Neurocirugia, Laboratorio de Fisica Medica, Insurgentes Sur 3877, Col. La Fama, 14269 Mexico D. F. (Mexico)

    2015-10-15

    Full text: In-vivo dosimetry is a challenge in radiotherapy due to the measures are carried out in reference conditions outside; there is no balance of charged particle and beam consists of photons own and contamination electrons. Detectors that are useful for such measures should be sufficiently small and thin so they do not disturb the beam and do not alter the dose on target. In this paper the radiochromic films Gafchromic model EBT3 are evaluated as potential detectors for in-vivo dosimetry; measurements were carried out in solid water phantom on the surface, with films of dimensions 3 x 3 cm{sup 2}. Irradiations were performed with a linear accelerator Novalis of 6 MV. Comparison between dose values found with a diode type Sfd detector (IBA dosimetry, Germany) and a diamond detector CVD (PTW-Freiburg) for 2 different sized of field (5 x 5 cm{sup 2} and 10 x 10 cm{sup 2}) on the surface of a water phantom scanning was realized. The total spreading factor (Tsf) measured on surface was of 0.831 ± 4.6%; which is greater 12.9% than Tsf measured at a depth of maximum dose. This difference may be due to the contribution of scattered electrons to the beam exit. The measures must be corroborated with Monte Carlo simulations, which they will be validated on surface by the Abdel-Rahman [et al.] method; this mechanism will determine if the films are useful detectors for in-vivo dosimetry clinically. (Author)

  16. Using digital models for evaluation of effective solar radiance. Development of methodology and practice application; Empleo de modelos digitales del terreno para la evaluacion de la radiacionsolar effectiva. Desarrollo de una metodologia y aplicacion practica

    Energy Technology Data Exchange (ETDEWEB)

    Izco, E.; De Blas, M.; Torres, J. L.; Garcia, R.

    2004-07-01

    In this communication it has been described the use of advanced tools for determining the effective solar radiance, and its possible passive and active, thermic or photovoltaic, development, in various areas of buildings or urban zones. According to cartographic information of a Digital Elevation Model , and in ECOTEC v5.20 software. An hourly treatment of illuminated and shaded zones has been carried out for several days of the year. In a case study it has been proven that the software ECOTEC v5.20 can work with the Digital Elevation Model of Public University of Navarra, and it has been analyzed illuminated and shaded zones visual and quantitatively for two days of the year, summer and winter solstices . (Author)

  17. Analysis of the process of evaluation of plans of arcoterapia volumetric (Rapid Arc) with an array of detectors; Analisis del proceso de evaluacion de planes de arcoterapia volumetrica (RapidArc) con una matrix de detectores MatriXXEvolution

    Energy Technology Data Exchange (ETDEWEB)

    Ramos Pacho, J. A.; Martin Rincon, C.; Saez Beltran, M.; Verde Velasco, J. M.; Garcia Repiso, S.; Delgado Aparicio, J. M.; Perez Alvarez, M. E.; Cons Perez, N.; Gomez Gonzalez, N.; Sena Espinel, E.

    2013-07-01

    The objective of this work is to analyze this procedure, comparing the results obtained with the dose level exported of planner, processed taking into account the size of the detectors and the separation between them. In addition, dose level calculated with its original resolution is compared with the measure made with radiochromic film. (Author)

  18. Evaluation of the thermal-mechanic performance of fuel rods MOX in fuel assemblies 10 x 10; Evaluacion del desempeno termo-mecanico barras combustibles MOX en ensambles combustible 10 x 10

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez L, H., E-mail: hector.hernandez@inin.gob.mx [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico)

    2012-10-15

    In the Instituto Nacional de Investigaciones Nucleares (Mexico) , we have been working in proposals of fuel assemblies that bear to the reduction of the plutonium inventories that exist a global level, plutonium coming from the dismantlement of the nuclear weapons as of the one used as fuel inside the reactors in operation at the present time. For this reason besides carrying out the evaluation of the neutron performance is necessary to realize the evaluation of the thermal-mechanic behavior of the rods that compose a fuel assembly with the purpose of determining if under the operation conditions to those that are subjected the fuel does not surpass the limit established and this causes a failure in the fuel element. In this sense when carrying out the analysis of an fuel element of mixed oxides in an arrangement 10 x 10 is observed that under the established operation conditions for the proposed cycle values that surpass the limit established for fuel failure are not presented, therefore the proposed assembly can be used as reload element in the nuclear power plant of Laguna Verde. (Author)

  19. Implementation of the program of quality control of the system on-board imager of varian: initial assessment; Puesta en marcha del programa de control de calidad del sistema on-board imager de varian: evaluacion inicial

    Energy Technology Data Exchange (ETDEWEB)

    Ortega Martin, I.; Ruiz Morales, C.; Lopez Sanchez, F.; Tobarra Gonzalez, B. M.

    2013-07-01

    This work aims to present evidence that are part of our quality control system on-board Imager of Varian, elaborated from recommendations and national and international protocols, as well as a first assessment of the results obtained to date. (Author)

  20. Preparation and evaluation of Exendin radio conjugates for detecting insulinomas and gastrinomas by molecular nuclear medicine techniques; Preparacion y evaluacion de radioconjugados de Exendin para la deteccion de insulinomas y gastrinomas por tecnicas de medicina nuclear molecular

    Energy Technology Data Exchange (ETDEWEB)

    Medina G, V.

    2015-07-01

    The gastro-entero-pancreatic neuroendocrine tumors (GEP-NET) are named based on the secreted hormones. Among them, the insulinomas and gastrinomas represent a diagnostic challenge because of their slow metabolic rate, small size and anatomical location that have limited their detection in some imaging procedures. About 90% of insulinomas are benign and 10% are malignant. Benign insulinomas express the glucagon-like peptide-1 receptor (GLP-1R) and low levels of somatostatin receptors (SSTR), while malignant insulinomas over express SSTR or GLP-1R in low levels. A kit for the preparation of Lys{sup 27} ({sup 99m}Tc-EDDA/HYNIC)-Exendin(9-39)/{sup 99m}Tc-EDDA/HYNIC-Tyr{sup 3}-Octreotide was developed to detect 100% of gastrinomas and insulinomas. In order to reach this aim, the peptides were radiolabeled and characterized. Stability studies will be completed and the in vitro and in vivo behavior was evaluated. The Lys{sup 27}({sup 99m}Tc-EDDA/HYNIC)-Exendin(9-39)/{sup 99m}Tc-EDDA/HYNIC-Tyr{sup 3}-Octreotide can be labeled with {sup 99m}Tc, obtaining high radiochemical purities (>94%), high stability in human serum and affinity to GLP-1 and SST-2 receptor. This new formulation showed properties suitable for use as a target-specific agent for molecular imaging of GLP-1R/SSTR positive tumors. In vivo micro-SPECT/CT images of Lys{sup 27}({sup 99m}Tc-EDDA/HYNIC)-Exendin(9-39), {sup 99m}Tc-EDDA/HYNIC-Tyr{sup 3}-Octreotide and of the pharmaceutical formulation Lys{sup 27}({sup 99m}Tc-EDDA/HYNIC)-Exendin(9-39)/{sup 99m}Tc-EDDA/HYNIC-Tyr{sup 3}-Octreotide showed the main elimination pathways, and tumors higher uptake compared to the background tissues. The biodistribution and imaging studies demonstrated properties suitable for its use as a target-specific agent for the simultaneous molecular imaging of GLP-1R and SSTR. (Author)

  1. La vida social de los precios: evaluaciones monetarias y acción económica en los mercados de la seguridad privada = The social life of prices: monetary assessments and economic action in private security markets

    Directory of Open Access Journals (Sweden)

    Valcarce, Federico Lorenc

    2010-01-01

    Full Text Available A partir de un estudio sobre los mercados de la seguridad privada en Argentina, el presente artículo aborda la manera en que los precios son producidos, percibidos, interpretados y manipulados en el curso de las acciones económicas de diversos agentes, así como las estrategias se despliegan para controlar la competencia y el intercambio. Mi trabajo se apoya sobre unas treinta entrevistas con dirigentes de empresas de seguridad y unas cuarenta entrevistas con diversos clientes de esas empresas, además de observaciones realizadas en unas veinte empresas del sector e intercambios informales con informantes clave. Además, me sirvo de materiales producidos por organismos públicos, por cámaras y entidades profesionales del ámbito de la seguridad, y por las propias empresas. En el desarrollo del trabajo, muestro que los precios son negociados en el curso de las transacciones mercantiles y que los actores introducen otros principios de interacción que la competencia para tratar de asegurar la rentabilidad de sus empresas o la calidad de los productos que compran

  2. TL and LOE dosimetric evaluation of diamond films exposed to beta and ultraviolet radiation; Evaluacion dosimetrica TL y LOE de peliculas de diamante expuestas a radiacion beta y ultravioleta

    Energy Technology Data Exchange (ETDEWEB)

    Preciado F, S.; Melendrez, R.; Chernov, V.; Barboza F, M. [Universidad de Sonora, A.P. 13 y A.P. 5-088, 83000 Hermosillo, Sonora (Mexico); Schreck, M. [Universitaet Augsburg, Institut fuer Physik D-86135 (Germany); Cruz Z, E. [ICN, UNAM, 04500 Mexico D.F. (Mexico)

    2005-07-01

    The diamond possesses a privileged position regarding other materials of great technological importance. Their applications go from the optics, microelectronics, metals industry, medicine and of course as dosemeter, in the registration and detection of ionizing and non ionizing radiation. In this work the results of TL/LOE obtained in two samples of diamond of 10 {mu}m thickness grown by the chemical vapor deposition method (CVD) assisted by microwave plasma. The films were deposited in a silicon substrate (001) starting from a mixture of gases composed of CH{sub 4}/H{sub 2} and 750 ppm of molecular nitrogen as dopant. The samples were exposed to beta radiation (Sr{sup 90}/ Y{sup 90}) and ultraviolet, being stimulated later on thermal (TL) and optically (LOE) to evaluate their dosimetric properties. The sample without doping presented high response TL/LOE to the ultraviolet and beta radiation. The TL glow curve of the sample without doping showed two TL peaks with second order kinetics in the range of 520 to 550 K, besides a peak with first order kinetics of more intensity around 607 K. The TL efficiency of the non doped sample is bigger than the doped with nitrogen; however the LOE efficiency is similar in both samples. The results indicate that the CVD diamond possesses excellent perspectives for dosimetric applications, with special importance in radiotherapy due to it is biologically compatible with the human tissue. (Author)

  3. Optically stimulated luminescence and thermoluminescence in CVD diamond and dosimetric evaluation in fields of ionizing radiation; Luminiscencia opticamente estimulada y termoluminiscencia en diamante DQV y evaluacion dosimetrica en campos de radiacion ionizante

    Energy Technology Data Exchange (ETDEWEB)

    Barboza F, M.; Chernov, V.; Pedroza M, M. [Centro de Investigaciones en Fisica, Universidad de Sonora, A.P. 5-088, 83190 Hermosillo, Sonora (Mexico); Schreck, M. [Universitat Augsburg, Institut fur Physik D-86135, Augsburg (Germany); Preciado F, S.; Melendrez, R. [Universidad de Sonora, A.P. 130, 83000 Hermosillo, Sonora (Mexico)

    2006-07-01

    The optically stimulated luminescence (OSL) results a highly appropriate dosimetric technique for readings of absorbed radiation 'in alive' and 'in situ', as well as in real time. The CVD diamond on the other hand presents excellent qualities like radiation reader thanks to its reproducibility, radiation resistance, biocompatibility and non toxicity. The present work studies the answer of two diamond films pure and polluted with nitrogen (750 ppm) grown by the Chemical Vapor Deposition method (CVD) on silicon substrate (001) irradiated with beta (Sr-90) in the 0.833-100 Gy interval. The optical stimulation was carried out by 40 seconds with infrared laser (830 nm, 0.36 W/cm{sup 2}) and the filter BG-39 (300-600 nm) coupled the PM. The intensity and the decay of the hyperbolic type of the LOE curves were similar in both samples, for the non doped diamond were observed trapping states in 200-380 C being compared with those that it presents the polluted diamond with nitrogen in 80-277 C. The dosimetric behavior in the pure sample is observed lineal in two regions 0-16 Gy and in 30-100 Gy, only the doped sample didn't present linearity in the all range of the studied dose. The advantage is stood out of LOE on TL because the first one not requires of thermal stimulation in such a way that is more appropriate to detect and to measure radiation doses in biomedicine. (Author)

  4. Application of CalME incremental-recursive method to the evaluation of the structural condition as asphalt pavements; Aplicacion del metodo recursivo-incremental CalME a la evaluacion del estado estructural de los pavimentos bituminosas

    Energy Technology Data Exchange (ETDEWEB)

    Mateos Moreno, A.; Perez Ayuso, J.; Cadavid Jauregui, B.; Marron Fernandez, J. O.

    2011-07-01

    CalME procedure represents one of the most advanced tools for the design, of flexible pavements world-wide. It is an incremental-recursive method, which means that pavements service life must be divided into many time intervals where both structural integrity and environmental conditions can be regarded as constants. It also means that the damage calculated at the end of each interval must be considered as initial condition for the next one. The goal of this type of models is the prediction of the evolution of the different distress mechanisms. The advantages of incremental-recursive procedures versus classical analytical design are shown in this paper. Advantages are shown not only in terms of design, but also as a tool in order to support structural evaluation. In particular, the potential of asphalt fatigue model incorporated in CalME is presented. this model is initially calibrated in the laboratory, and it is then re-calibrated based on the actual performance observed from field deflection testing. The model provides a reliable prediction of the future evolution of the damage of the asphalt mixture. Fatigue model validation has been conducted based on the performance from several flexible sections evaluated in CEDEX full-scale pavements test track. (Author) 14 refs.

  5. Physical and chemical evaluation of the effect of a magnetic field on the electrodeposition of Ni in low carbon steel; Evaluacion fisica y quimica del efecto de un campo magnetico en la electrodeposicion de Ni en acero bajo carbono

    Energy Technology Data Exchange (ETDEWEB)

    Campo G, G. A.

    2015-07-01

    In this study nickel coatings were obtained, with and without the presence of magnetic field at 60 degrees Celsius for 7, 12 and 17 minutes on substrates of AISI 1018 carbon steel, from a classical type Watts solution. The properties of the coatings were studied by X-ray diffraction, scanning electron microscopy and atomic force microscopy, hardness tester and roughness tester, the electrochemical behavior of the films was also studied through RP and EIE and also capacitance calculations, corrosion rate and thickness were made. In general, the magnetic field has a negative influence on the physical and chemical properties of an electrodeposited Ni steel AISI 1018. The details are discussed in this research. (Author)

  6. Evaluation of the secondary cardiotoxicity to use adriamycin in patients with breast cancer with nuclear medicine studies; Evaluacion de la cardiotoxicidad secundaria al empleo de adriamicina en pacientes con cancer de mama con estudios de medicina nuclear

    Energy Technology Data Exchange (ETDEWEB)

    Garcia P, S

    2003-07-01

    The number of surviving of cancer is increased highly with the current regimes of chemotherapy. For the year 2010 in U.S. it is considered that one of each 250 adults can be a survivor of wicked illness and many of these survivors will have been exposed to regimes with anthracycline. The anthracyclines concern to the group of antibiotics and they are effective point for hematological neoplasms as solid tumors. Although the relationship dose answer, among the regimes with anthracycline as well as the remission and the period free of illness is very established one, the latent risk of cardiotoxicity limits the use of these agents. Results: 30 patients were recruited with diagnostic of invader breast cancer tried with chemotherapy to base anthracycline in the understood period of may to december of the 2000. The medium of age it was of 48 years with a range of 27-80 years. The clinical stage that prevailed it was the EC IIB that represents a 36% in second place the EC IIIA with a 20%, EC IIA with 16% the EC IIIB and the unclassifiable ones represented 10% with 3 patients and finally the clinical stage IV with 8%, the most frequent localization was the left side.The received chemotherapy outline it was with the base of doxorubicin in its modality neo or patient adjutant, 5 patients also received taxanes like treatment adjutant. Prevailed the continuous infusion in 24 hours in 50%. The medium of accumulated dose of adriamycin was 274 mg/m{sup 2}. With a left ventricular ejection fraction LVEF pretreatment of 62% (medium) determined by VRI and a medium of 69% by SPECT. The LVEF pos treatment had one medium of 57% for VRI and by SPECT a medium of 60%. They received concomitant radiotherapy with chemotherapy in modality pre operation 53.3% (16 patients), and 40% radiotherapy post operation, 2 patients didn't receive radiotherapy. In relation to the heart toxicity any patient present electrocardiographic alterations, neither arrhythmias neither clinical data of heart congestive failure, although in the SPECT carried out pos treatment it was documented cardiac ischemia in 12.9% calling the attention that of these patients only one had received radiotherapy to left side and the other ones three to the right side having alone the obesity like characteristic in common. It results difficult to conclude given the size of our sample that the documented ischemia heart is secondary to the doxorubicin. Neither is discarded that the ischemia is an unknown toxicity of the doxorubicin and would have to consider the use of the SPECT in complementary form with the VRI in patient of high risk. (Author)

  7. Evaluation of fatigue vessel in the Sta. M Garona NPP : real transients and design transients; Evaluacion de la fatiga en la vasija de CN Santa M de Garona: transitorios reales frente a transitorios de diseno

    Energy Technology Data Exchange (ETDEWEB)

    Martin, J.; Gorrochategui, I.

    2005-07-01

    The number of transient that control the fatigue of its reactor pressure vessel is included in the Sta. M Garona NPP Technical Specifications, being the different transients described in the design specification of the corresponding component. In this work, on the one hand, the description of the design transients with their corresponding real ones is compared and, on the other hand, the number of occurrences and the number of transients originally estimated is also compared. In both cases the influence of the difference between design and reality in the fatigue usage is discussed. (Author)

  8. Syringe's between the SIDP and structural integrity: assessments of fracture and real time fatigue; Sinergias entre el SIDP y la integridad estructural: evaluaciones de fractura y fatiga en tiempo real

    Energy Technology Data Exchange (ETDEWEB)

    Cicero, R.; Sierra, M.

    2011-07-01

    Analysis of aging and degradation of the components in nuclear plants is a fundamental requirement nowadays indispensable in the life management of the plants, both to ensure the perfect operation and to ensure the safety of people and the environment, and therefore instrumental in the renewal of the operating license for the same.

  9. Economic evaluation of application of nuclear power, fossil and biomass for seawater desalination in the case of Mexico; Evaluacion economica de la aplicacion de la potencia nuclear, fosil y biomasa para desalar agua de mar en el caso de Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Palacios G, N.; Gomez A, R.; Vazquez R, R.; Espinosa P, G. [Universidad Autonoma Metropolitana, Unidad Iztapalapa, Depto. de Ingenieria de Procesos e Hidraulica, Av. San Rafael Atlixco 186, Col. Vicentina, 09340 Mexico D. F. (Mexico)], e-mail: rvr@xanum.uam.mx

    2009-10-15

    In this work the fresh water production costs are compared on base to the seawater desalination, taking advantage of the heat or the electricity generated by means of the nuclear fission, the energy fossil result of the combustion of natural gas, fuel oil and coal, as well as the electricity generated by the bio-fuels combustion. The option of generating electricity and at the same time to produce drinking water is discussed. Using electricity, the best combination of technologies as for costs, the option more cheap, it is the distillation by means of a distillation combined process of multiple effects combined with reverse osmosis using nuclear energy coming from a gas cooled reactor using a cycle Brayton. While using direct heat was as the option more economic the use of nuclear vapor of low pressure exchanging heat in a vapor generator of low pressure, as energy source of a flash distillation process of several stages. In this last case, the energy source or nuclear vapor will be the result of the operation of a nuclear power plant cooled and moderate with water and operating in a cycle Rankine. (Author)

  10. Evaluacion de la biopsia transpedicular guiada por TAC Avaliação da biópsia transpedicular guiada por TC Evaluation of transpedicular percutaneous biopsy guided by CT

    Directory of Open Access Journals (Sweden)

    Luis Miguel Rosales Olivarez

    2012-09-01

    Full Text Available OBJETIVO: Valorar la utilidad de la biopsia transpedicular percutánea guiada por Tomografía Axial Computarizada en conjunto con la sistematización de estudios como pruebas diagnósticas de la etiología de la destrucción vertebral. MÉTODOS: Estudio de serie de casos prospectivo transversal de 21 pacientes a los que se les realizó biopsia transpedicular percutánea guiada por Tomografía Axial Computarizada y estudios de laboratorio y gabinete de marzo a julio del 2011, para evaluar su utilidad en el diagnóstico de destrucción vertebral. RESULTADOS: Fueron 21 pacientes, 14 hombres y 7 mujeres, con edad media de 59,2 años, cuyos niveles más afectados estuvieron en L1, L2 y L3. El reporte de la biopsia tuvo una precisión diagnóstica del 90,4%. En 2 casos se realizó correlación clínica entre biopsia y sistematización de estudios para obtener el diagnóstico. CONCLUSIÓN: La biopsia guiada por Tomografía Axial Computarizada es una técnica sencilla, útil, de bajo costo y eficaz en el estudio de la destrucción vertebral; la sistematización de estudios permite corroborar el diagnóstico de la biopsia.OBJETIVO: Avaliar a utilidade da biópsia transpedicular percutânea guiada por tomografia axial computadorizada em conjunto com a sistematização de estudos, como exames diagnósticos da etiologia da destruição vertebral. MÉTODOS: Estudo de série de casos, prospectivo e transversal de 21 pacientes submetidos à biópsia transpedicular percutânea guiada por tomografia axial computadorizada e exames laboratoriais e radiológicos, de março a julho de 2011, para avaliar sua utilidade no diagnóstico de destruição vertebral. RESULTADOS: Foram analisados 21 pacientes, 14 homens e 7 mulheres, com média de idade de 59,2 anos, cujos níveis mais afetados foram L1, L2 e L3. O laudo da biópsia teve precisão diagnóstica de 90,4%. Em dois casos, realizou-se a correlação clínica entre biópsia e sistematização de exames para obter o diagnóstico. CONCLUSÃO: A biópsia guiada por tomografia axial computadorizada é uma técnica simples, útil, de baixo custo e eficaz para o estudo da destruição vertebral; a sistematização de estudos permite corroborar o diagnóstico da biópsia.OBJECTIVE: To evaluate the usefulness of percutaneous transpedicular biopsy guided by CT together with systematic studies such as diagnostic tests of the etiology of vertebral destruction. METHODS: Case series, prospective and crossover study of 21 patients who underwent percutaneous transpedicular biopsy guided by CT and laboratory tests and radiological studies from March to July 2011, to evaluate its usefulness in the diagnosis of vertebral destruction. RESULTS: We analyzed 21 patients, 14 men and 7 women, mean age 59.2 years, whose most affected levels were L1, L2, and L3. The biopsy report had diagnostic accuracy of 90.4%. In 2 patients the clinical correlation between biopsy and systematization of diagnostic studies was carried out. CONCLUSION: CT-guided biopsy is a simple, useful, inexpensive, and effective technique for the study of vertebral destruction; the systematic studies allow us to corroborate the diagnosis made by biopsy.

  11. A Hull cell study of a NiW electrolyte and evaluation of its properties; Estudio en celula Hull de un bano electrolitico de NiW y evaluacion de sus propiedades

    Energy Technology Data Exchange (ETDEWEB)

    Garcia-Urrutia, I.; Diez, J. A.; Muller, C.; Calvillo, P.

    2009-07-01

    Interest in NiW coatings has grown in recent years due to its favourable properties such as hardness, and resistance to both wear and corrosion, making it one of the actual alternatives to hard chromium coatings. In this work, we have undertaken a Hull cell study, investigating the influence of the metal concentration, temperature, pH and current density on the composition of the alloy formed and its thickness. We have also studied the most important properties of the NiW deposits, including morphology, hardness, and resistance to abrasion and corrosion. (Author) 9 refs.

  12. Evaluation of a consolidation treatment in dolostones by mean of calcium hydroxide nanoparticles in high relative humidity conditions; Evaluacion del tratamiento de consolidacion de dolomias mediante nanoparticulas de hidroxido de calcio en condiciones de alta humedad relativa

    Energy Technology Data Exchange (ETDEWEB)

    Gomez-Villalba, L. s.; Lopez-Arce, P.; Zornoza, A.; Alvares de Buergo, M.; Fort, R.

    2011-07-01

    In this article, the results of a treatment applied to dolomitic stones using an isopropyl colloidal solution based on calcium hydroxide nanoparticles with a concentration of 2.0g/l are presented. The consolidation process in the stone has been checked before and after 28 days of exposure to 75% relative humidity. Morphologic and structural studies of the consolidating product confirmed the carbonation process. X ray diffraction, electron microscopy (TEM and ESEM), and electron diffraction carried out on the consolidating product have confirmed the transformation of portlandite phase to calcium carbonate polymorph, calcite, aragonite and vaterite. Petrophysical tests performed on the stone before and after the application of the product have shown the improvement in the physical and hydrical properties due to the increase in the ultrasound velocity and density of the material, and a decrease in the capillarity coefficient and open porosity without significant changes in colour and brightness. The application of the consolidating product in the proposed experimental conditions is a natural method, compatible with the petrological characteristics of the substrate, without secondary damages on the stone, being an effective method to improve the durability of carbonate stones. (Author) 26 refs.

  13. Evaluation of the diagnostic capacity of the DETEC-PC for the attract of iodine in thyroid; Evaluacion de la capacidad de diagnostico del DETEC-PC para la captacion de iodo en tiroides

    Energy Technology Data Exchange (ETDEWEB)

    Alonso A, D. [CPHR, Calle 20 No. 4113 e/41 y 47. Playa C.P. 11300, La Habana (Cuba); Arista R, E. [CEADEN, A.P. 6195, C.P. 10600, La Habana (Cuba); Alonso A, A. [Hasselt University, Building D, 3590 Diepenbeek (Belgium)]. e-mail: lola@cphr.edu.cu

    2006-07-01

    A comparative study whose main objective is the evaluation of the diagnoses capacity of the DETEC - PC, a detection-measurement system for the reception of iodine in thyroid, with it presumptive diagnostic is presented. To such effect a clinical essay was designed in which all the patients included in the study were evaluated using the new equipment (DETEC - PC) and the standard diagnoses procedure well-known for the initials RIA. The sample size was calculated in a such way that the percent of gross coincidence among both methods could be estimate with a precision of 1% at a trust level of 95%. In total 110 patients were included in the essay. For the analysis of the agreement in the diagnostic it was used the Kappa statistician. The obtained results showed a high grade of gross agreement and an agreement level among moderate and substantial when it was corrected by possible random agreement among both procedures. (Author)

  14. Feasibility evaluation of two solar cooling systems applied to a cuban hotel. Comparative analysis Evaluacion de factibilidad del uso dos sistemas climatización solar aplicado a un hotel cubano ; Análisis comparativo

    Directory of Open Access Journals (Sweden)

    Yamile -Diaz Torres

    2016-02-01

    Full Text Available The article presents an analysis of technical and economic feas ibility of using two configurations of solar cooling in a Cuban hotel. HVAC hybrid schemes are: a cooler of ice water vapor compression (chiller interconnected in parallel with a smaller capacity chiller, fir st with a solar-powered a bsorption cooling system (SACS, and then with a photovoltaic cooling system(PSC. Both were simulated taking into account the weather conditions in the regi on, thermodynamic calculation met hodologies and principles that govern these technologies. The results show t hat the use of these alternativ es contributes to reduci ng energy consumption and the environmental impact of heating, ventilation and air co nditioning systems (HVAC. Economic analysis highlights that PCS is more favorable than the SACS taking into account the cooling cost generation (CCG but energy assessment indicates that SACS has higher thermal performance for the case study to which it is applied. El artículo presenta un análisis de factibilidad técnica y económic a de uso de dos configuraciones de climatización solar en un hotel cubano. Los esquemas de climatización híbridas son: una enfriadora de agua helada de compresión de vapor (chiller interconectada en paralelo con una enfriadora de absorción asistida con energía solar térmica (SACS, si glas en inglés, y posteriormente c on un chiller asistido por un sistema solar fotovoltaico (PSC, siglas en ingles. Ambos fueron simulados teniendo en cuenta las condiciones meteorológicas de la región, metodologías de cálcul o y principios termodinámicos que gobiernan estos sistemas. Los resultados muestran que el uso de estas alternativas contribuye a la reducción del consumo energético y el impacto ambiental de los sistemas calefacc ión, ventilación y aire acondicionado (HVAC, siglas en inglés. El análisis económico resalta que PCS es má s favorable que el SACS, teniendo en cuenta el costo de generación de frío (CCG, siglas en inglés pero la evaluación energética indica que este último posee mayores prestaciones térmicas para el caso de estudio al cual se le aplica.

  15. Evaluation of the national cogeneration potential as an option for the expansion of the national electric system; Evaluacion del potencial nacional de cogeneracion como opcion en la expansion del sistema electrico nacional

    Energy Technology Data Exchange (ETDEWEB)

    Nieva Gomez, Rolando; Hernandez Galicia, Julio Alberto [Instituto de Investigaciones Electricas, Cuernavaca (Mexico); Portes Mascorro, Enrique; Alvarez Chavez, Jose Maria [Comision Nacional para el Ahorro de Energia (CONAE), Mexico, D. F. (Mexico)

    1997-12-31

    The Comision Nacional para el Ahorro de Energia (CONAE) carried out a study to determine the amount of electric energy available by cogeneration in the industrial sector of our country. This study is based in a survey among the enterprises with the largest fuel consumption belonging to the industrial and commercial sectors and to the petrochemical branch of Petroleos Mexicanos (PEMEX). The results of the study are presented, which show the location of the cogeneration potential by the following estimates: a) The scenario under a potential of 5770 MW to generate annually 4.55 x 107 MWh of electric energy. b) The scenario with a potential of 10819 MW to generate annually 9.47 x 107 Mwh of electric energy [Espanol] La Comision Nacional para el Ahorro de Energia (CONAE) llevo acabo un estudio para determinar la cantidad de energia electrica disponible por cogeneracion en el sector industrial de nuestro pais. El estudio se fundamenta en una encuesta entre las empresas con mayor consumo de combustibles pertenecientes a los sectores industrial y comercial y al ramo petroquimico de Petroleos Mexicanos (PEMEX). Se presentan los resultados del estudio, el cual muestra la ubicacion del potencial de cogeneracion por los siguientes estimados: a) El escenario bajo con un potencial de 5770 MW para producir anualmente 4.55 x 107 Mwh de energia electrica. b) El escenario alto con un potencial de 10819 MW para producir anualmente 9.47 x 107 MWh de energia electrica

  16. Results of the Interlaboratory Exercise CNS/CIEMAT-05 among Environmental Radioactivity Laboratories (Vegetable Ash); Evaluacion de la Intercomparacion CSN/CIEMAT-2005 entre Laboratorios Nacionales Radiactividad Ambiental (Ceniza Vegetal)

    Energy Technology Data Exchange (ETDEWEB)

    Romero Gonzalez, M. L.; Barrera Izquierdo, M.; Valino Garcia, F.

    2006-07-01

    The document describes the outcome of the CSN/CIEMAT-05 interlaboratory test comparison among environmental radioactivity laboratories. The exercise was organised according to the ISO-43 and the IUPAC {sup I}nternational harmonised protocol for the proficiency testing of analytical chemistry laboratories{sup .} The exercise has been designed to evaluate the capability of national laboratories to determine environmental levels of radionuclides in vegetable ash samples. The sample has been prepared by the Environmental Radiation Laboratory, from the University of Barcelona, and it contains the following radionuclides: Sr-90, Pu-238, Am-241, Th-230, Pb-210, U-238, Ra-226, K-40, Ra-228, TI-208, Cs- 137 and Co-60. Reference values have been established TROUGH the kind collaboration of three international laboratories of recognized experience: IAEA MEL and IRSN-Orsay. The results of the exercise were computed for 35 participating laboratories and their analytical performance was assessed using the z-score approach. Robust statistics of the participant's results was applied to obtain the median and standard deviation, to achieve a more complete and objetiva study of the laboratories' performance. Some difficulties encountered to dissolve the test sample caused a lower response of analyses involving radiochemical separation, thus some laboratories couldn't apply their routine methods and no conclusions on PU-238, Am-241 and Th-230 performances have been obtained. The exercise has revealed an homogeneous behaviour of laboratories, being statistical parameters from the results close to the reference values. The study has shown that participant laboratories perform radioactive determinations in vegetable ash samples with satisfactory quality levels. (Author) 6 refs.

  17. Program of internal training of the ININ personnel participating in the PERE of the CLV (1998). I. Initial evaluation; Programa de capacitacion interna del personal del ININ participante en el PERE de la CLV (1998). I. Evaluacion inicial

    Energy Technology Data Exchange (ETDEWEB)

    Suarez, G. [ININ, 52045 Ocoyoacac, EStado de Mexico (Mexico)

    1999-01-15

    According to the document 'Program of Internal Training of the Personnel of the ININ participant in the PERE of the CLV (1998)' presented to the National Center of Disasters Prevention, it was included an action of previous evaluation to courses and practices with the purpose of knowing the state of knowledge regarding those activities that have to carry out. In this report the results of the evaluation are presented. Six questionnaires were elaborated: 1. The PERE and its procedures. 2. Control of the radiological exposure of the response personnel. 3. Control of water and foods. 4. Communications system of the PERE. 5. Monitoring, classification and decontamination of having evacuated. 6. Specialized medical attention. (Author)

  18. 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)

  19. Evaluation of the Possibility of Cultivation of Eggplant and Common Vetch in a Mercury Contaminated Area; Evaluacion de la posibilidad de cultivo de veza y berenjena en un area contaminada con mercurio

    Energy Technology Data Exchange (ETDEWEB)

    Sierra, M. J.; Millan, R.; Esteban, E.

    2006-12-18

    This study is framed in the project Recuperacion de Terrenos Afectados por Mercurio Ambiental (RETAMA) which determines the behaviour of mercury in the soil-plant system within the area of Almaden. It forms part of experimental work of doctoral thesis carried out by Maria Jose Sierra and directed by Rocio Millan and Elvira Esteban. The objective of this work was to study the mercury absorption capacity of Solanum melongena (eggplant) and Vicia sativa (common vetch), and the distribution of this metal in this crop. The possible use of eggplant culture as an economic alternative in a mercury contaminated area has been evaluated. The present study has been carried out using a soil from the mercury mining district of Almaden (Spain). The total mercury concentration of this soil is 14.16 + 0.65 mg kg-1 on average. The selected crops are typical in the area of study, eggplant is much appreciated for human consumption and common vetch is an important forage crop. At the end of the document (Anexo V) a critical reading of several articles related to the study subject have been enclosed. (Author) 50 refs.

  20. The methodology for the evaluation of the energy saving by the daylight saving time in Mexico; Metodologia para la evaluacion del ahorro de energia debido al cambio de horario durante la epoca del verano

    Energy Technology Data Exchange (ETDEWEB)

    Ramos Niembro, Gaudencio [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1996-12-31

    A description is made of the methodology for the evaluation of energy saving by the daylight saving time in Mexico. A mathematical model was developed that would allow the quantitative evaluation of the energy saving by the daylight saving time, through measurements of the consumption of different users from the domestic commercial and industrial sector, considering the various variables that impact the consumption [Espanol] Se describe la metodologia para la evalucion del ahorro de energia por el cambio de horario de verano en Mexico. Se desarrollo un modelo matematico que permitiera evaluar cuantitativamente el ahorro de energia debido al cambio de horario durante la epoca de verano, atraves de mediciones de consumos de los diferentes usuarios de los sectores domestico, comercial e industrial, considerando las diversas variables que impactan en el consumo

  1. Assessment methodology of the summer time schedule change (CHV) in Mexico: 10 years of application; Metodologia de evaluacion del cambio de horario de verano (CHV) en Mexico: 10 anos de aplicacion

    Energy Technology Data Exchange (ETDEWEB)

    Maqueda Zamora, Martin Roberto; Perez Rebolledo, Hugo [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2008-07-01

    The Summer Time is strongly bound to the rational use of the natural resources, since it is a measure that contributes to the care of the country energy resources and the improvement of the environment. This measure consists of advancing the clock one hour in the months that have greater insolation in the country and when doing it, the electrical energy demand is reduced, a saving in the consumption of the same is obtained, resulting in a reduction of the fossil fuel consumption that is needed to generate electric energy and also the emission of polluting agents to the environment is detained. It is to emphasize that the sustainable development and the environment depend on the energy efficient use. With the application of the Summertime Schedule, the entire country participate in the care of the energy resources that are derived from their application and generates in the population a culture of the care of the energy and the environment. This program is applied to world-wide level, including the industrialized countries. In this paper the methodology implemented by the Instituto de Investigaciones Electricas (IIE) is presented, to realize the calculations of saving in electrical power consumption and the quantification of the avoided demand, as well as the main results obtained in 10 years of application of the measure in Mexico. [Spanish] El horario de verano esta fuertemente ligado al uso racional de los recursos naturales, ya que es una medida que contribuye al cuidado de los recursos energeticos del pais y la mejora del medio ambiente. Esta medida consiste en adelantar el reloj una hora en los meses que se tiene mayor insolacion en el pais y al hacerlo, se reduce la demanda de energia electrica, se tiene un ahorro en el consumo de la misma y como resultado se reduce el consumo de combustibles fosiles que se necesitan para generar la energia electrica y tambien se dejan de emitir contaminantes al medio ambiente. Cabe resaltar que el desarrollo sustentable y el medio ambiente dependen del uso eficiente de la energia. Con la aplicacion del horario de verano, todo el pais participa en el cuidado de los recursos energeticos que se derivan de su aplicacion y genera en la poblacion una cultura del cuidado de la energia y el medio ambiente. Este programa se aplica a nivel mundial, incluyendo a los paises industrializados. En este trabajo se presenta la metodologia implementada por el Instituto de Investigaciones Electricas (IIE), para realizar los calculos de ahorro en consumo de energia electrica y la cuantificacion de la demanda evitada, asi como los principales resultados obtenidos en 10 anos de aplicacion de la medida en Mexico.

  2. Evaluation of the effectiveness of the means of radioprotection Central Hospital LNS National Police of Peru; Evaluacion de la efectividad de los medios de radioproteccion en hospital central LNS de la policia nacional del Peru

    Energy Technology Data Exchange (ETDEWEB)

    Yovera Alvarez, J.; Basilio Chiappe, M.

    2011-07-01

    From observations of the damage caused by radiation, the need for protection and are the first recommendations in 1931. Based on this knowledge of both the damage and the protective measures already tested, it is desirable that institutions that use ionizing radiation, to establish the epidemiological surveillance system to control this risk .

  3. Application of the Bow Tie method for evaluation of safety in the procedure of logging wells; Aplicacion del metodo de Bow Tie para la evaluacion de seguridad en la practica de perfilaje de pozos

    Energy Technology Data Exchange (ETDEWEB)

    Alfonso Pallares, C; Perez Reyes, Y.; Sarabia Molina, I.I. [Centro Nacional de Seguridad Nuclear (CNSN), La Habana (Cuba)

    2013-07-01

    This work consists of an assessment of security in the practice of logging of oil wells, using the method of Bow Tie for being a simple method of evaluation of the risk, which makes it possible in a structured way to set priorities to manage risk.

  4. Factor assessment circular field of a conical collimator 4.0 mm for functional radiosurgery; Evaluacion del factor de campo de un colimador circular conico de 4.0 mm para radiocirugia funcional

    Energy Technology Data Exchange (ETDEWEB)

    Zucca Aparicio, D.; Garcia Ruiz-Zorrila, J.; Fernandez Leton, P.; Perez Moreno, J. M.; Minambres Moro, A.

    2011-07-01

    The dosimetric characterization of narrow beams is complicated by the finite size of the radiation detector, loss of lateral electronic balance and positioning of equipment for measuring radiation. A high degree of uncertainty arises when factors are measured field in this situation, although considering that this mode relative dosimetry is performed using high resolution detectors such as diode or by film dosimetry. (Author)

  5. Evaluation of a Monte Carlo calculation algorithm for clinical use extracranial stereotactic radiotherapy (SBRT); Evaluacion de un algoritmo de calculo Monte Carlo de uso clinico para radioterapia esterotaxica extracraneal (SBRT)

    Energy Technology Data Exchange (ETDEWEB)

    Zuca Aparicio, D.; Perez Moreno, J. M.; Fernandez Leton, P.; Garcia Ruiz-Zorrila, J.; Minambres Moro, A.

    2013-07-01

    At present it is not common to find commercial planning systems that incorporate dose calculation algorithms to do based on Monte Carlo [1,2] photons This paper summarizes the process followed in the evaluation of a dose calculation algorithm for MC beams of 6 MV photons from an accelerator dedicated to radiosurgery (SRS), cranial stereotactic radiotherapy (SRT) and extracranial (SBRT). (Author)

  6. Preliminary evaluation of anhydrous ethanol as a solvent in the oilseed extraction of Jatropha curcas L.; Evaluacion preliminar del etanol anhidro como solvente en la extraccion de aceite de semillas de jatrofa (Jatropha curcas L.)

    Energy Technology Data Exchange (ETDEWEB)

    Brossard-Gonzalez, C.; Ferrari, R. A.; Pighinelli, A. L.; Park, K. J.

    2010-07-01

    A preliminary evaluation was performed on anhydrous ethanol as a solvent for the extraction of oil from whole Jatropha curcas L. seeds (32.24 % lipids, 16.05 % proteins), supplied from Mato Grosso, Brazil. The methodology of factorial 2k designs was followed, which included a comparison between pressing and n-hexane extraction methods. The regression model corresponding to the comparison between ethanol and n-hexane, varying extraction time, did not have lack of fit and presented an R2 of 99%. The experimental design for the pressing method, varying press rotation speed and temperature, yielded a poorly fitted linear model. The oil composition extracted with ethanol was similar to those obtained by n-hexane and by pressing. The highest yield (36.7%) was obtained using ethanol for 4 hours. The excess of extracted material was attributed to additional solubilization of impurities that could be diminished by limiting the extraction time to 1 hour. The oil extracted with ethanol and by pressing have the same color. It is presumed that the purification steps for both oils should be similar. Further studies using mixtures of ethanol with small proportions of n-hexane are suggested. (Author) 20 refs.

  7. Wastewater treatment by a pilot system of artificial wetlands: removal evaluation of the organic load; Tratamiento de aguas residuales por un sistema piloto de humedales artificiales: evaluacion de la remocion de la carga organica

    Energy Technology Data Exchange (ETDEWEB)

    Romero Aguilar, Mariana [Centro de Investigacion en Biotecnologia, Universidad Autonoma del Estado de Morelos, Cuernavaca, Morelos (Mexico)]. E-mail: ortizhl@uaem.mx; Colin Cruz, Arturo [Facultad de Quimica, Universidad Autonoma del Estado de Mexico, Toluca, Estado de Mexico (Mexico); Sanchez Salinas, Enrique; Ortiz Hernandez, Ma. Laura [Centro de Investigacion en Biotecnologia, Universidad Autonoma del Estado de Morelos, Cuernavaca, Morelos (Mexico)

    2009-08-15

    Wastewater treatment is a priority at the global level, because it is important to have enough water of good quality, which will allow an improvement of environment, health and life quality. In Mexico, because of insufficient infrastructure, high costs, lack of maintenance and qualified staff, only 36 % of the generated wastewaters are treated, which generates the need for developing alternative technologies for their depuration. Artificial wetlands are an alternative due their high efficiency for removal of polluting agents and their low installation and maintenance costs. This paper evaluates the removal percentage of the organic charge of wastewaters in a treatment system of artificial wetlands of horizontal flux, with two vegetal species. The system was designed with three modules installed in a sequential way. At the first one, organisms of the species Phragmites australis (Cav.) Trin. ex Steudel were integrated; at the second, organisms of the species Typha dominguensis (Pers.) Steudel, and at the third, both species. The experimental modules were installed at the effluent of a primary treatment, which contains municipal wastewater coming from a research building. The following parameters were analyzed in the water: chemical oxygen demand (COD), ions of nitrogen (N-NO{sub 3}-, N-NO{sub 2}- y N-NH{sub 4}{sup +}) and total phosphorus. Additionally, the total count of bacteria associated to the system was evaluated. Results showed that the system is an option for the removal of organic matter and nutrients, of low operation and maintenance costs. [Spanish] El tratamiento de las aguas residuales es una cuestion prioritaria a nivel mundial, ya que es importante disponer de agua de calidad y en cantidad suficiente, lo que permitira una mejora del ambiente, la salud y la calidad de vida. En Mexico, debido a la insuficiente infraestructura, los altos costos, la falta de mantenimiento y de personal capacitado, solo 36 % de las aguas residuales generadas reciben tratamiento, lo cual crea la necesidad de desarrollar tecnologias para su depuracion. Los humedales artificiales son una alternativa de tratamiento debido a su alta eficiencia de remocion de contaminantes y a su bajo costo de instalacion y mantenimiento. En el presente trabajo se evalua el porcentaje de remocion de la carga organica de aguas residuales, en un sistema de tratamiento por humedales artificiales de flujo horizontal y con dos especies vegetales. El sistema fue disenado con tres modulos instalados de manera secuencial. En el primero se integraron organismos de la especie Phragmites australis (Cav.) Trin. ex Steudel, en el segundo, organismos de la especie Typha dominguensis (Pers.) Steudel y en el tercero las dos especies. Los modulos experimentales fueron instalados a la salida de un tratamiento primario, el cual contiene aguas residuales municipales provenientes de un edificio de investigacion. En el agua se analizaron los siguientes parametros: demanda quimica de oxigeno (DQO), los iones de nitrogeno (N-NO{sub 3}{sup -}, N-NO{sub 2}{sup -} y N-NH4+) y el fosforo total. Tambien se realizo el conteo de bacterias asociadas al sistema. Los resultados demostraron que el sistema es una opcion para la remocion de la carga organica y de nutrimentos, de bajo costo de operacion y mantenimiento.

  8. Evaluacion de la biopsia transpedicular guiada por TAC Avaliação da biópsia transpedicular guiada por TC Evaluation of transpedicular percutaneous biopsy guided by CT

    OpenAIRE

    Luis Miguel Rosales Olivarez; Hugo Rolando Nieto Sandoval; Armando Alpízar Aguirre; Barón Zárate Kalfopulos; María Guadalupe Sánchez Bringas; Alejandro Antonio Reyes Sánchez

    2012-01-01

    OBJETIVO: Valorar la utilidad de la biopsia transpedicular percutánea guiada por Tomografía Axial Computarizada en conjunto con la sistematización de estudios como pruebas diagnósticas de la etiología de la destrucción vertebral. MÉTODOS: Estudio de serie de casos prospectivo transversal de 21 pacientes a los que se les realizó biopsia transpedicular percutánea guiada por Tomografía Axial Computarizada y estudios de laboratorio y gabinete de marzo a julio del 2011, para evaluar su utilidad en...

  9. Evaluation of energy saving in pilot projects of window type air conditioning equipment in the domestic sector; Evaluacion del ahorro de energia en proyectos pilotos en equipos de aire acondicionado tipo ventana en el sector domestico

    Energy Technology Data Exchange (ETDEWEB)

    Duran Ramirez, Ricardo [Comision Nacional para el Ahorro de Energia, Mexico, D.F. (Mexico)

    2001-07-01

    The present work shows the energy saving when replacing low efficiency window type air conditioning equipment, for higher efficiency equipment, as well as the necessary parameters to identify the results obtained by the pilot projects of substitution of conventional equipment for other more efficient in the domestic sector. [Spanish] El presente trabajo muestra los ahorros de energia al sustituir equipos de aire acondicionado tipo ventana de baja eficiencia, por equipos de mayor eficiencia, asi como los parametros necesarios para identificar los resultados obtenidos, por los proyectos pilotos de sustitucion de equipos convencionales por otros mas eficientes en el sector domestico.

  10. BWR simulation in a stationary state for the evaluation of fuel cell design; Simulacion de un reactor BWR en estado estacionario para la evaluacion del diseno de celdas de combustible

    Energy Technology Data Exchange (ETDEWEB)

    Montes T, J. L.; Ortiz S, J. J.; Perusquia del C, R.; Castillo M, A., E-mail: joseluis.montes@inin.gob.mx [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico)

    2014-10-15

    In this paper the simulation of a BWR in order to evaluate the performance of a set of fuel assemblies under stationary state in three dimensions (3-D) is presented. 15 cases selected from a database containing a total of 18225 cases are evaluated. The main selection criteria were based on the results of the design phase of the power cells in two dimensions (2-D) and 3-D initial study. In 2-D studies the parameters that were used to qualify and select the designs were basically the local power peaking factor and neutron multiplication factor of each fuel cell. In the initial 3-D study variables that defined the quality of results, and from which the selection was realized, are the margins to thermal limits of reactor operation and the value of the effective multiplication factor at the end of cycle operation. From the 2-D and 3-D results of the studies described a second 3-D study was realized, where the optimizations of the fuel reload pattern was carried out. The results presented in this paper correspond to this second 3-D study. It was found that the designs of the fuel cell they had a similar behavior to those provided by the fuel supplier of reference BWR. Particularly it noted the impact of reload pattern on the cold shut down margin. An estimate of the operation costs of reference cycle analyzed with each one designed reload batch was also performed. As a result a positive difference (gain) up to 10,347 M/US D was found. (Author)

  11. Evaluacion de las practicas de control de infecciones de los trabajadores de la salud en un hospital de Lima Metropolitana, durante la epidemia de Influenza A H1N1

    National Research Council Canada - National Science Library

    Martín Javier Yagui-Moscoso; Carolina Tarqui-Mamani; Hernán A Sanabria-Rojas; Edith E Encarnación- Gallardo

    2012-01-01

      Objetivo Determinar el nivel de cumplimiento de las prácticas de control de infecciones en los trabajadores de la salud en un hospital de Lima Metropolitana durante la epidemia de Influenza A H1N1. Material y métodos Se realizó...

  12. Evaluation of the radioactive impact on the areas surrounding to the rafts of phosphogypsum prior to its restoration; Evaluacion del impacto radiactivo en las areas limitrofes a las balsas de fosfoyeso previo a su restauracion

    Energy Technology Data Exchange (ETDEWEB)

    Gazquez, M. J.; Mantero, J.; Mosqueda, F.; Garcia-Tenorio, R.; Bolivar, J. P.

    2013-07-01

    The aim of this study was to evaluate the existing radioactive impact around the phosphogypsum ponds, analyzing the enrichment of radionuclides in the efflorescence produced by the liquid effluents from these deposits of phosphogypsum. (Author)

  13. Evaluation of bone metastases with {sup 18} F- Sodium fluoride PET/CT; initial experience; Evaluacion de metastasis oseas con {sup 18} F-Fluoruro de sodio PET/CT; experiencia inicial

    Energy Technology Data Exchange (ETDEWEB)

    Sanchez C, N.; Serna M, J.A.; Quiroz C, O.; Quinzanos, F.; Valenzuela, J.; Ramirez A, J.L. [Hospital Angeles del Pedregal, Mexico D.F. (Mexico)

    2007-07-01

    The study of NaF-18 PET/CT is the modality with bigger sensitivity and specificity for the bony metastases detection. This additional value of the NaF-18 PET/CT can have a beneficent impact in the clinical handling of the patients with prostate cancer with high risk. (Author)

  14. Evaluation of the recombination in somatic cells induced by radiation in different stages of Drosophila larval development; Evaluacion de la recombinacion en celulas somaticas inducida por radiacion en diferentes etapas del desarrollo larvario de Drosophila

    Energy Technology Data Exchange (ETDEWEB)

    Cruces, M.P.; Morales R, P. [Instituto nacional de Investigaciones Nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    1997-07-01

    The mitotic recombination can happen spontaneously and its frequency is very low, however the recombination rate of a cell can be increased by the exposure to agents which cause damage to DNA. This type of agents are knew commonly as recombinogens. The ionizing radiation and a numerous chemical agents can be mentioned (Vogel, 1992). The objective of this work is to determine if the mutation/recombination rate induced by gamma rays varies with the development stage. In order to realize this investigation it was used the mutation and somatic recombination test of Drosophila wing (Graf and col. 1984). The mwh/ mwh and flr{sup 3}/TM3, Ser stocks were used. (Author)

  15. Evaluation of the radial design of fuel cells in an operation cycle of a BWR reactor; Evaluacion del diseno radial de celdas de combustible en un ciclo de operacion de un reactor BWR

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez C, J.; Martin del Campo M, C. [Laboratorio de Analisis en Ingenieria de Reactores Nucleares, Facultad de Ingenieria, UNAM, Paseo Cuauhnahuac 8532, Jiutepec, Morelos (Mexico)]. e-mail: jgco@ver.megared.net.mx

    2003-07-01

    This work is continuation of one previous in the one that the application of the optimization technique called Tabu search to the radial design of fuel cells of boiling water reactors (BWR, Boiling Water Reactor) is presented. The objective function used in the optimization process only include neutron parameters (k-infinite and peak of radial power) considering the cell at infinite media. It was obtained to reduce the cell average enrichment completing the characteristics of reactivity of an original cell. The objective of the present work is to validate the objective function that was used for the radial design of the fuel cell (test cell), analyzing the operation of a one cycle of the reactor in which fuels have been fresh recharged that contain an axial area with the nuclear database of the cell designed instead of the original cell. For it is simulated it with Cm-Presto the cycle 10 of the reactor operation of the Unit 1 of the Nuclear Power station of Laguna Verde (U1-CNLV). For the cycle evaluation its were applied so much the simulation with the Haling strategy, as the simulation of the one cycle with control rod patterns and they were evaluated the energy generation and several power limits and reactivity that are used as design parameters in fuel reloads of BWR reactors. The results at level of an operation cycle of the reactor, show that the objective function used in the optimization and radial design of the cell is adequate and that it can induce to one good use of the fuel. (Author)

  16. Evaluation of a dispersion medium for the irradiation of blood products in a electron linear accelerator; Evaluacion de un medio dispersor para la irradiacion de hemoderivados en un acelerador lineal de electrones

    Energy Technology Data Exchange (ETDEWEB)

    Ordiales, J. M.; Falero, B.; Vazquez, M.; Alvarez, F. J.

    2013-07-01

    The use of bags of rice as dispersion medium in irradiation of blood products for medical use is less effective than the immersion from the point of view dosimetric water. However, given the wide range of dose values for a valid result and once subjected to quality control procedure, the method provides the necessary work for the irradiation of blood products in a linear electron accelerator. (Author)

  17. Evaluation of the potentiality of a Mexican natural zeolite chabazite-type in the lead removal in water; Evaluacion de la potencialidad de una chabasita natural mexicana en la remocion de plomo en agua

    Energy Technology Data Exchange (ETDEWEB)

    Alvarado I, J.; Sotelo L, M.; Meza F, D.; Paz M, F. A. [Universidad de Sonora, Blvd. Luis Encinas y Rosales s/n, Col. Centro, Hermosillo, Sonora (Mexico); Maubert F, M., E-mail: msotelo@guaymas.uson.mx [Universidad Autonoma Metropolitana, Unidad Azcapotzalco, Av. San Pablo 180, Col. Reynosa-Tamaulipas, 02200 Mexico D. F. (Mexico)

    2013-06-01

    The intention of this paper is to present the characterization of a natural zeolite, chabazite-type, from the Mexican reservoir La Palma, at Divisaderos, Sonora, where their potential use as ion exchange material to remove lead in water is assessed. The chabazite was characterized through X-ray diffraction, Icp-OES, Icp-Ms, EDX, Bet and TG/TGD. The results indicate the presence of Ba(1930 ppm) and Sr(1220 ppm), which are characteristic of aluminium rich phases. A chabazite modification treatment is proposed by using solutions of NaOH (0.1 M) and NH{sub 4}NO{sub 3} (1 M). The lead removal kinetics both in natural zeolite as in their chemically modified forms was obtained by using the ion exchange process in a batch reactor. The results show how unnecessary natural zeolite homo ionization is for the removal of lead, thereby obtaining the equilibrium concentration of unmodified zeolite for plotting the adsorption isotherm, which was adjusted to Langmuir model. The Langmuir isotherm has a good fit of the results at equilibrium (R{sup 2}=0.92), which demonstrates that natural zeolites studied, in its natural form, contains exchangeable cations required (Ca{sup +2}, Mg{sup 2+} and Na{sup +}) for potentially be used as an adsorbent material/ion exchanger for water treatment impacted by lead. (Author)

  18. Evaluation of the problematic of corrosion in bottoms of tanks of crude oil storage; Evaluacion de la problematica de corrosion en fondos de tanques de almacenamiento de petroleo crudo

    Energy Technology Data Exchange (ETDEWEB)

    Malo T, Jose M; Uruchurtu C, Jorge; Meza, Beatriz [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico); Lopez C, Luis F [Region Marina Suroeste, Pemex (Mexico)

    2003-07-01

    In this article the results related to the corrosive aggressiveness of the water fluids of crude oil of the Marine Terminal of Dos Bocas (TMDB), on the effectiveness of the anticorrosive control methods and on the control measures that could be adopted are presented. Also, this article comprises a work made by personnel of the Instituto de Investigaciones Electricas (IIE) during year 2002. The corrosion in tanks is of electrochemical nature and has its origin in the watery phase that accompanies the crude oil on being extracted from underground. In the case of the storage tanks, the watery phase separates at the bottom, causing the wetness of the bottom steel plates and its degradation. Due to the limited access to the interior of the tank during its operation, a testing device was designed that was connected to a drain valve of a tank of the terminal. The experimental work looked for the evaluation of the aggressiveness of the fluids, the type of corrosion products formed and the effectiveness of the cathodic protection and of the coatings. Additionally, fluid samples were collected, for analyzing the natural aggressiveness level that presents the water contained in the three types of crude: Mayan, Olmeca and Istmo handled in the terminal, studying steel samples and of plant fluids under controlled laboratory conditions. The aggressiveness was obtained from measurements of corrosion rates and analysis of microbial activity. The feasibility of applying the method of cathodic protection was analyzed, observing its effectiveness, as well as particular corrosion forms as the ones that occur in the pontoons. The results of the study lead to propose a monitoring scheme to pursuit the integrity of the coatings, the operation of the cathodic protection and the corrosion in tanks, with which a better control of the operation of the anticorrosive methods and of the degradation that occurs with the corrosion, could be obtained. [Spanish] En este trabajo se presentan resultados relacionados con la agresividad corrosiva de los fluidos de agua de crudo de la Terminal Maritima de Dos Bocas (TMDB), sobre la efectividad de los metodos de control anticorrosivo y sobre medidas de control que podrian adoptarse. Asimismo, este articulo forma parte de un trabajo realizado por personal del Instituto de Investigaciones Electricas (IIE) durante el ano 2002. La corrosion en tanques es de naturaleza electroquimica y tiene su origen en la fase acuosa que acompana al crudo al ser extraido del subsuelo. En el caso de los tanques de almacenamiento, la fase acuosa se separa en el fondo, ocasionado el mojado de las placas de acero del fondo y su degradacion. Debido al limitado acceso al interior del tanque durante su operacion, se diseno un dispositivo de pruebas que fue conectado a una valvula de drenado de un tanque de la terminal. El trabajo experimental busco evaluar la agresividad de los fluidos, el tipo de productos de corrosion formados y la eficacia de la proteccion catodica y de los recubrimientos. Adicionalmente, se recolectaron muestras de fluidos para analizar el nivel de agresividad natural que presenta el agua de los tres tipos de crudos: Maya, Olmeca e Istmo, manejados en la terminal, estudiando muestras de acero y de fluidos de planta bajo condiciones controladas de laboratorio. La agresividad se obtuvo de mediciones de velocidades de reaccion de corrosion y de analisis de actividad microbiana. Se analizo la factibilidad de aplicar el metodo de proteccion catodica, observando su efectividad, asi como formas particulares de corrosion como la que ocurre en los pontones. Los resultados del estudio conducen a proponer un esquema de monitoreo para el seguimiento de la integridad de los recubrimientos, la operacion de la proteccion catodica y la corrosion en tanques, con el que se podria tener un mejor control de la operacion de los metodos anticorrosivos y de la degradacion que ocurre por corrosion.

  19. Evaluation of the presence of a burnable absorber in an assembly 3x3 type PWR; Evaluacion de la presencia de un absorbedor quemable en un ensamble 3x3 tipo PWR

    Energy Technology Data Exchange (ETDEWEB)

    Martinez F, M. A.; Del Valle G, E.; Alonso V, G. [IPN, Escuela Superior de Fisica y Matematicas, Av. IPN s/n, Col. Lindavista, Mexico D. F. 07738 (Mexico)]. e-mail: mike_ipn_esfm@hotmail.com

    2008-07-01

    In the present work the effect is evaluated that causes the presence of a burnable absorber in an adjustment of rods of 3x3 of a fuel assembly type PWR using CASMO-4 code, when comparing the infinite multiplication factor and some average cross sections by means of codes MCNP-4A, CASMO-3 and HELIOS. For this evaluation two cases are evaluated: first consists of an adjustment of rods of 3x3 full completely of fuel and the second consists of a central rod full with a burnable absorber type wet annular burnable absorber (WABA) and the remaining full fuel rods. In both cases the enrichment of the fissile isotopes is varied, for two types of fuel, MOX degree armament and UO{sub 2}. (Author)

  20. MR Cholangiography: Axial TSE-T2 Sequence Evaluation in the Diagnosis of Choledocholithiasis; Colangiografia RM: evaluacion de la secuencia TSE-T2 axial en la deteccion de coledocolitiasis

    Energy Technology Data Exchange (ETDEWEB)

    Alustiza, J. M.; Gervas, C.; Garcia, E.; Recondo, J. A. [Hospital Donostia. San Sebastian (Spain)

    2003-07-01

    To evaluate diagnostic precision of the axial TSE-T2 sequence in the diagnosis of choledocholithiasis. Retrospective analysis of all those MR cholangiography studies performed in our center between January 1998 and June 1999 which were later subjected to conventional cholangiography (intraoperative) as a golden standard. A total of 39 patients was studied. Imaging parameters of the sequence evaluated, fat-suppressed TSE-T2 in the axial plane, were as follows: TE 100 ms, TR 1.800 ms, turbo factor 23 FOV 375 mm, NSA 4, 228 x 256 matrix, respiratory compensation, number of slices 35, slice thickness 3 mm, contiguous slices, scan duration 5'4''. Without having been informed as to the cholangiography result, two radiologists independently analyzed this sequence in order to determine the presence of choledocholithiasis. Their results were latter compared with those of the conventional cholangiography. The sensitivity, specificity and agreement between results were all calculated. 21 patients had choledocholithiasis. The analyzed sequence presented sensitivity 81%, specificity 89%, and agreement between radiologists 98%, Kappa index 0.949. The axial sequence TSE-T2 is reliable for choledocholithiasis diagnosis. (Author) 9 refs.

  1. Erosion in the river Nacimiento basin in the Vega Baja of Segura. Evolution and monitoring using GIS tools; Retroceso erosivo en la cuenca del rio Nacimiento en la Vega Baja del Segura: Evaluacion y seguimiento utilizando herramientas SIG

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez Juan, J. E.

    2009-07-01

    In this paper, we are tried to known the most significant erosion processes that effect the study areas selected in the last 50 years, according to the different land uses in the study area, as well as the lithologic formation of them. to do this we have used GIS technology (Geographic Information Systems) to compare the erosion processes of the different periods of study and for data collection in a thematic cartography. Generally are relief that are colonized by natural vegetation, but the main area are soils that have been deforested and plowed. Will be in the latter ones which will generate more concentrated runoff and soil loss. In the comparative analysis between the different frames, we observed that the anthropic practices have degrees of erosion and loss of superficial material alarming. (Author) 6 refs.

  2. Evaluation of the persistence in the induction of Sister Chromatid Exchanges (SCE) by alkylating agents; Evaluacion de la persistencia en la induccion de Intercambio en las Cromatidas Hermanas (ICH) por agentes alquilantes

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez R, R.; Huerta V, C.; MOrales R, P.R. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    2006-07-01

    The persistence in the induction of sister chromatid exchanges (SCE) by the alkylating agents methyl and ethyl-methanesulfonates (MMS and EMS) was evaluated. For it, to groups of mice its were administered a dose of these agents and later its were analyzed the induced SCE's in two periods: early and late. Both agents caused high increments of SCE in the early period and small in the late one; however, the caused lately by EMS was significantly bigger. This late induction of SCE by EMS possibly is associated with an epigenetic change or with the presence of etiladucts in the phosphodiester bonds of the DNA. (Author)

  3. Development of an automated informatic system, for the evaluation of damage in plastics and minerals; Desarrollo de un sistema informatico automatizado, para la evaluacion de danos en plasticos y minerales

    Energy Technology Data Exchange (ETDEWEB)

    Hidalgo V, V.; Lopez G, A.D.; Ledezma F, L.E.; Segovia R, A.; Balcazar, M. [ININ, 52750 La Marquesa, Estado de Mexico (Mexico)

    2008-07-01

    A computer system of pattern recognition to evaluate automatically the damages registered by positive ions in minerals and plastics was developed. In the case of minerals the apatite in which was achievement to recognize and to count the damages by spontaneous fission of the uranium contained in her was selected. The selected plastic was the CR39, in which was possible to obtain the distribution of the diameters of the you give you taken place by slight ions in this plastic. In both cases, the recognition of patterns you bases on Ision for Computer, using the methodology described by Gonzalez and Woods [6]. The technique consists in: Acquisition of the Image, Pre-prosecution, Segmentation, Description and Classification; the computer system you development making use of the software Matlab version 7. The Apatita you selects for their importance in the one dated geologic and the determination of the thermal history, both of importance in the oil prospecting. In the case of the CR39 their importance resides in its wide and massive use as dosimetro of neutrons, determination of environmental Radon and detection of nuclear reactions of low section. (Author)

  4. Radiochromic film calibration EBT2 Gafchromic-R for the evaluation of skin dose in interventional radiology; Calibracion de la pelicula radiocromica Gafchromic EBT2 para la evaluacion de la dosis en piel en radiologia intevencionista

    Energy Technology Data Exchange (ETDEWEB)

    Manano Herrera, J. A.; Roldan Arjona, J. M.; Martinez-Luna, R. J.; Soler Cantos, M. M.

    2011-07-01

    The estimate of the dose in the entrance surface (DSE) in interventional radiology procedures is of interest to identify those which by their nature may lead to skin lesions. The purpose of this paper is to analyze the possibility of use of radiochromic film GAFCHROMICrEBT2 in the estimation of the DSE in these procedures. This is a calibration curve obtained in the dose range of this type of scans proving its validity in relation to the dose given in Perspex phantom exposed to similar values ??of fluoroscopy time and number of acquisitions of employees in the above proceedings.

  5. Technological evaluation for the extension of the operation license to the nuclear power plant of Laguna Verde; Evaluacion tecnologica para la extension de la licencia de operacion de la Central Nucleoelectrica Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Arganis J, C. R.; Medina A, A. L., E-mail: carlos.arganis@inin.gob.m [ININ, Departamento de Tecnologia de Materiales, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico)

    2010-07-01

    At the present time one of the tendencies in the nuclear industry is the renovation of operation licenses of the nuclear power plants, with the purpose of prolonging their operation 20 years more than the time settled down in their original license, which is of 30 years for the case of the nuclear power plant of Laguna Verde. This allows the electric power generation for a major period of time and to a relatively low price, giving this way a bigger competitiveness to the power stations of nuclear power. However, to request the license extension of the nuclear power plant requires to get ready the documentation and necessary studies for: to maintain a high level of security, to optimize the operation, maintenance and service life of the structures, systems and components, to maintain an acceptable level of performance, to maximize the recovery of the investment about the service of the nuclear power plant and to preserve the sure conditions for a major operation period at the license time. This paper describes the studies conducted by the Materials Technology Department of the Instituto Nacional de Investigaciones Nucleares (ININ) to substantiate the required documentation for obtaining the extension of operating license of the nuclear power plant. These studies are focused mainly in the reactor pressure vessels of both units, as well as in the deposit of noble metals and the influence of the sludges (crud s) in this deposit. (Author)

  6. Expert system for assessing risk and prevention of methane explosions in coal mines. Sistema experto para evaluacion del riesgo y la prevencion de explosiones de grisu en minas de carbon

    Energy Technology Data Exchange (ETDEWEB)

    1991-05-01

    The expert system described here was developed by members of AITEMIN as part of a project financed by Ocicarbon, the General Directorate of Mines and MINER Construction. The article begins by asking the question, 'What is an expert system '. 1 tab.

  7. EVALUACION DE LA EFICIENCIA DE LA INDUSTRIA TEXTIL ESPAÑOLA A PARTIR DE INFORMACIÓN ECONÓMICO-FINANCIERA: UNA APLICACIÓN DEL ANÁLISIS ENVOLVENTE DE DATOS.

    Directory of Open Access Journals (Sweden)

    COLL SERRANO, V. (* Y BLASCO BLASCO, O.Mª (*

    Full Text Available There is no competitiveness problem when there are no competitors. For that reason, differentiation constitutes a key strategy for the company; then it contributes to generate a captive market for the product reducing this way its competition. Supposing that differentiation is not possible, costs and efficiency appear as the only possible way (Esteban y Coll, 2003. Focusing the attention in the last one, this paper analyzes -by employing a non parametric methodology: the data envelopment analysis (DEA- the technical efficiency of textile industry in Spain. For that, we have studied a group of companies of each and every activity that constitute the textile industry following the classification CNAE93. The evaluation has been done from financial-economic information obtained from the profit and losses account and balance sheet.

  8. Evaluation of iron phosphate (III) as reactive material for removal of uranium in water; Evaluacion del fosfato de hierro (III) como material reactivo para la remocion de uranio en agua

    Energy Technology Data Exchange (ETDEWEB)

    Solis M, L

    2004-02-01

    The levels of toxic metals in the atmosphere are topic of growing interest. This has provoked that the legislation is stricter, for that that the industry and centers of investigation has worried and busy of to look for and to develop more effective methods for the control of the contamination, with the purpose of being inside this levels. The phosphate compounds are being investigated for the removal of pollutants of the water and soil. In this work, it was synthesized to the ferric phosphate in a simple way in the laboratory, obtaining high grade of purity and yield. The characterization of this product was in a physicochemical way and of surface, through diverse analytical techniques. In the first place, the physicochemical characterization was carried out for Scanning Electron Microscopy of High Vacuum, X-ray diffraction, Infrared Spectroscopy with Fourier Transform, and Thermal gravimetric Analysis, the surface characterization was carried out for analysis of the surface area, determination of the isoelectric point by potentiometric and of mass titrations. The previous techniques allowed to identify the ferric phosphate synthesized as a compound amorphous beige color, with a relationship of atoms Fe:1, P:1, O:4, which showed connections P-O and went stable to changes of temperature. The surface area it was of 21 g / m{sup 2}, the isoelectric point corresponded to a p H of 1.5, which coincided so much by potentiometric like by mass titration. The number of active sites was of 106 sites /nm{sup 2}. After the characterization of the ferric phosphate the compound was evaluated as reactive material for the removal of uranyl ions through sorption tests. The kinetics of hydration showed that the product requires of 24 hours to saturate the sites capable of to be hydrated. The sorption kinetics required 22 hours of contact to reach the maximum sorption of uranyl ions for the ferric phosphate. The sorption isotherms showed that not significant difference exists when using 0.05, 0.1, 0.15 and 0.2 g of ferric phosphate, for that 0.1 g of material was used. The isotherms were carried out in function of the p H of the uranyl solutions and of the mass of the ferric phosphate where is observed that to p H 3.5-5 the percentage of removal is the highest reaching bigger values to 90%. Finally the data of the sorption of uranium was adjusted to the pattern of Langmuir. (Author)

  9. Evaluation of dose due to the liberation of the radioactive content present in systems of final disposal of radioactive residues; Evaluacion de la dosis debida a la liberacion del contenido radiactivo presente en sistemas de disposicion final de residuos radiactivos

    Energy Technology Data Exchange (ETDEWEB)

    Amado, V.; Lopez, F. [Autoridad Regulatoria Nuclear, Av. Del Libertador 8250, Ciudad Autonoma de Buenos Aires (C1429BNP) (Argentina)]. e-mail: vamado@cae.arn.gov.ar

    2006-07-01

    The disposal systems of radioactive residuals well-known as repositories near to the surface, are used to dispose residuals that can contain high concentrations of radionuclides of period of short semi disintegration, which they would decay at levels radiologically insignificant in some few decades or in some centuries: and acceptably low concentrations of radionuclides of period of long semi disintegration. The dose that would receive the critic group due to these systems it could be increased by cause of discreet events that affect the foreseen retard time, or by the gradual degradation of the barriers. To this last case it contributes the presence of water, because it implies leaching and dissolution that can give place to radionuclide concentrations in the underground water greater to the prospective ones. The dosimetric evaluation is important because it offers useful objective information to decide if a given repository is adjusted to the purposes of its design and it fulfills the regulatory requirements. In this work a simplified evaluation of the dose that would receive the critic group due to the liberation of contained radionuclides in a hypothetical system of final disposition of radioactive residuals is presented. For it, they are considered representative values of the usually contained activities in this type of systems and they are carried out some approaches of the source term. The study is developed in two stages. In the first one, by means of the Radionuclide pollutant scattering pattern in phreatic aquifers (DRAF) it is considered the scattering of the pollutants in the phreatic aquifer, until the discharge point in the course of the nearest surface water. This model, developed originally in the regulatory branch of the National Commission of Argentine Atomic Energy (CNEA); it solves the transport equation of solutes in porous means in three dimensions, by the finite differences method having in account the soil retention and the radioactive decay. In the second stage, the PC CREAM program (Consequences of Releases to the Environment Assessment Methodology) it allows to study the scattering in the surface water until the location of the critic group and to carry out the dosimetric evaluation. The objective of the work is to show the utility of these models to estimate, with regulatory purposes and by means of preservative criteria, the order of magnitude of the expected concentrations and the involved doses. (Author)

  10. Obtaining of a barium compound by combustion chemistry and their evaluation as Co adsorbent; Obtencion de un compuesto de bario por combustion quimica y su evaluacion como adsorbente de Co

    Energy Technology Data Exchange (ETDEWEB)

    Rosas G, N. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    2008-07-01

    In this work, barium carbonate synthesized by chemical combustion method using a chemical precursor prepared by the combination of barium nitrate and urea as a fuel, with a 1:1 molar ratio in aqueous solution, the chemical precursor was heated to evaporate excess water, producing a homogeneous viscous liquid, that when heated to 900 centi grades for 5 minutes an exothermic reaction was produced very quickly and abruptly, forming a white powder final product, fine porous, little spongy, dry and crystalline ready to be used as material adsorbent. Additionally, the effect of water on the synthesis by chemical combustion was studied. Simultaneously, and with the purpose of comparing the advantages and disadvantages of the method by chemical combustion, barium carbonate was synthesized by precipitation method using barium nitrate salts and sodium carbonate. Synthesized barium carbonate, was characterized by X-ray diffraction, thermal gravimetric analysis, infrared spectrometry and scanning electron microscopy. We studied the adsorption capacity of Co present in aqueous solution by static tests on materials synthesized at room temperature using the neutron activation analysis. It was found that the synthesis by chemical combustion provides an interesting alternative compared to the synthesis by precipitation because it offers simplicity of synthesis and speed to have a good adsorbent material. It was found that the barium carbonate synthesized by the chemical combustion method using in their synthesis 1.0 ml of water, was the one who achieved the maximum adsorption capacity of 95.6% compared with the barium carbonate prepared by precipitation, which reached a capacity adsorption of 51.48%. (Author)

  11. Evaluation of effects to the health by liberations to the atmosphere of radioactive material of nucleo electric plants; Evaluacion de efectos a la salud por liberaciones a la atmosfera de material radiactivo de centrales nucleoelectricas

    Energy Technology Data Exchange (ETDEWEB)

    Martinez F, C.; Araiza M, E. [IPN-ESFM, 07738 Mexico D.F. (Mexico)] e-mail: carimtz@hotmail.com

    2003-07-01

    The objective of this work is to evaluate the effects on the population health border to a nuclear power station and to estimate the consequences caused by the liberation of radioactive material using the MACCS code (MELCOR Accident Consequence Code System), developed to evaluate the risks for have a severe accident in nuclear plants and to calculate the consequences outside of the one place. The code presents the radiological consequences in form of a complementary accumulative distribution function (CCDF). Graphics of the one total fatal cancerous and immediate damages against the occurrence probability, for a known term source and with the meteorological data of the Laguna Verde power station in one period from 1989 to 1998 and without considering measures of protection to the population. When analyzing these results an it is observed similar behavior in every year for the specific cases of radius of 0 to 16 Km and of 0 to 70 Km. The main parameters required by the one code in the enter file is the Inventory of radioactive products present to the beginning of the accident, the atmospheric source term, the one number of liberated feathers, its heights and temperatures, the meteorological data of the site, the distribution of the border population to the same one and the soil type. It is concluded that it is necessary an additional estimation that consider population's census and current characteristics of the area for to be able to observe the consequences variation. (Author)

  12. Evaluacion de Programas de Alfabetizacion. Consulta Tecnica Regional (Maracaibo, Venezuela, 30 Noviembre-6 Diciembre 1987) Informe Final. (Evaluation of Literacy Programs. Regional Technical Meeting (Maracaibo, Venezuela, November 30-December 6, 1987).

    Science.gov (United States)

    United Nations Educational, Scientific, and Cultural Organization, Santiago (Chile). Regional Office for Education in Latin America and the Caribbean.

    The objectives of this seminar were to identify problems in evaluating literacy programs and to design a working strategy to confront them. Four presentations included national case studies from Brazil, Honduras, Nicaragua, and Venezuela. Central questions asked concerned who and what were evaluated and how were the results to be used. In Brazil,…

  13. Results Assessment of Intercomparison Exercise CSN/CIEMAT-2010 among Spanish National Laboratories of Environmental Radioactivity (Diet Ashes); Evaluacion de la Intercomparacion CSN/CIEMAT-2010 entre los Laboratorios Nacionales de Radiactividad Ambiental (Ceniza de Dieta)

    Energy Technology Data Exchange (ETDEWEB)

    Gasco, C.; Trinidad, J. A.; Llaurado, M.; Suarez, J. A.

    2012-06-08

    This report describes the results assessment of the intercomparison exercise among environmental radioactivity laboratories, organised by Spanish Regulatory Institution (CSN) and prepared and evaluated by UAB and CIEMAT respectively. The exercise has been carried out following the international standards ISO-43 and ISO/IUPAC that provide a useful guide to perform proficiency tests and inter-laboratories comparisons. The selected matrix for this year (2010) was a diet ash obtained from the ashing of a whole fresh diet (breakfast, lunch and dinner), that was enriched with artificial radionuclides (Cs-137, Co-60,Fe-55,Ni-63,Sr-90,Am-241,Pu-238,Pu-239,240 y C-14) and contained natural radionuclides (U-234, U-238, U-natural Th-230, Th-234, Ra-226, Ra-228, Pb-210, Pb-212, Pb-214, Bi-214, Ac-228, Tl-208, K-40) at environmental level of activity concentration. The z-score test was applied to determine how much the laboratories differ from the reference value. The reference value for this exercise was the median of the results from the different laboratories and their standard deviations to achieve a more complete and objective study of the laboratories performance. The participant laboratories have demonstrated a satisfactory quality level for measuring the natural and artificial radionuclides content in this matrix. The reference values obtained through the medians show a negative bias for Pb-210 and Th-234 when comparing to the given values of external qualified laboratories from ENEA and IRSN and positive one for K-40. (Author)

  14. Improvement and safety assessment of NNPPS on Human and organisational factors; Programas de evaluacion y mejora de la seguridad de las CC.NN. en organizacion y factores humanos

    Energy Technology Data Exchange (ETDEWEB)

    Almeida, P.; Barrientos, M.; Cal, C. de la; Fernandez, B.; Garcia, A.; Gil, B.; Gonzalez, F.; Gonzalez, J.; Ibanez, M.; Perez, O.

    2002-07-01

    The periodic Safety Review process, associated to the renewal of the Operating Permits, includes the design and implementation of a safety assessment and improvement programme on Human and Organisational Factors, in the Spanish Nuclear power plants. Nowadays, the plants have already completed the preliminary design of their programmes (procedures, responsibilities, resources, projects, etc.) and are working on them to become fully operational. A CSN-UNESA working group has been created to facilitate and make more efficient their design and implementation. (Author)

  15. Technical and economical assessment of the options for energy saving in the library of the Universidad Autonoma Metropolitana-Azcapotzalco; Evaluacion tecnico economica de opciones para el ahorro de energia en la biblioteca de la Universidad Autonoma Metropolitana-Azcapotzalco

    Energy Technology Data Exchange (ETDEWEB)

    Bratu, N.; Campero, E.; Dorantes, R.; Fuentes, V.; Figueroa, A.; Garcia, R.; Zekkour, A. [Universidad Autonoma Metropolitana-Azcapotzalco, Mexico, D. F. (Mexico)

    1993-12-31

    This paper presents a diagnosis of the electrical energy consumption in the library of the Azcapotzalco Unit of the Universidad Autonoma Metropolitana, to determine the actions that can be implemented for energy conservation. This without disturbing the lighting and thermal comfort. The analysis showed that, by changing the reflecting surfaces of the lighting lamps, the number of units can be reduced, without lowering the illumination level below the recommended values. The saving was estimated for replacement of the fluorescent lamps for others of metallic halogenides in the areas where the ceiling is high; for the installation of switches to improve the selectivity in turning on and turning off the lamps, achieving this way a better usage of the natural light; for the reduction of the electric load of the air conditioning units which will be obtained in incorporating induced draft shafts; and for an improvement in the electric and ballast installation. For the actions that turned out to be redeemable in three years the assistance of the Fideicomiso de Apoyo al Programa de Ahorro de Energia del Sector Electrico (FIDE) of the Comision Federal de Electricidad (CFE) has been available. It is expected that the execution of the modifications will be carried out in the November and December months of 1993, and the results will be evaluated in 1994. [Espanol] En este trabajo se presenta un diagnostico del consumo de energia electrica en la biblioteca de la Unidad Azcapotzalco de la Universidad Autonoma Metropolitana para determinar las acciones que se pueden llevar a cabo para ahorrar energia electrica. Esto sin deteriorar el confort luminico y termico. El analisis mostro que, cambiando las superficies reflectoras de las luminarias, se puede reducir el numero de lamparas, sin que el nivel de iluminacion quede debajo de los valores recomendados. Se estimaron ahorros: por la sustitucion de las lamparas fluorescentes por otras de halogenuros metalicos en las partes donde el techo es alto; por la instalacion de apagadores para mejorar la selectividad en el encendido y apagado de las lamparas, logrando asi un mejor aprovechamiento de la iluminacion natural; por la reduccion de la carga electrica destinada al aire acondicionado que se obtendra al incorporar tiros de aire inducido; y por una mejoria en la eficiencia de la instalacion electrica y de los balastros. Para las medidas que resultaron amortizables en tres anos se cuenta con el apoyo del Fideicomiso de Apoyo al Programa de Ahorro de Energia del Sector Electrico (FIDE) de la Comision Federal de Electricidad (CFE). Se espera que la ejecucion de las modificaciones se lleve a cabo en los meses de noviembre y diciembre de 1993 y evaluar los resultados durante 1994.

  16. Evaluation of power quality in distribution system interaction and electric urban rail systems; Evaluacion de calidad de la potencia en la interaccion del sistema de distribucion y los sistemas electricos ferroviarios urbanos

    Energy Technology Data Exchange (ETDEWEB)

    Rios, Mario A.; Ramos, Gustavo A.; Moreno, Ricardo [Universidad de Los Andes, Bogota (Colombia). Dept. de Ingenieria Electrica y Electronica], Emails: mrios@uniandes.edu.co, gramos@uniandes.edu.co, ri-moren@uniandes.edu.co

    2009-07-01

    This article presents the evaluation of the phenomena of power quality in electrical systems for mass transport to make a profound study of the effects of harmonic distortion and transients. The evaluation was performed in a typical electrical distribution system. The computer programs used in this study are: ATP, HarmFlow and MATLAB.

  17. Results of the Interlaboratory Exercise CNS/CIEMAT-2008 among Environmental Radioactivity Laboratories (Phosphogypsum); Evaluacion de la Intercomparacion CSN/CIEMAT-2008 entre Laboratorios Nacionales de Radiactividad Ambiental (Fosfoyeso)

    Energy Technology Data Exchange (ETDEWEB)

    Romero, M. L.; Barrera, M.; Valino, F.

    2010-05-27

    The document describes the outcome of the CSN/CIEMAT-2008 interlaboratory test comparison among environmental radioactivity laboratories. The exercise was organised according to the ISO-43 and the ISO/IUPAC/AOAC. Aphosphogypsum material was used as a test sample, in an attempt to evaluate the performance of the laboratories analyzing NORM (Naturally-Occurring Radioactive Materials). The analysis required were: U-238, Th-234, U-234, Th-230, Ra-226, Pb-214, Bi-214, Pb-210, Po-210, Th-232 and U-235, and also gross alpha and gross beta activities. Reference values have been established according to the method of consensus of expert laboratories, with four international laboratories of credited experience: IAEA Seibersdorf, IAEA MEL, IRSN-Orsay and Sta.Teresa ENEA. The results of the exercise were computed for 34 answering laboratories and their analytical performance was assessed using the z-score. Robust statistics of the participants results was applied to obtain the median and standard deviation, to achieve a more complete and objective study of the laboratories performance. The exercise has shown an homogeneous behaviour of laboratories, being statistical parameters from the results close to the assigned Reference Values. Participant laboratories have demonstrated their ability to determine natural radionuclides in phosphogypsum samples (NORM material) with a satisfactory quality level. The scheme has also allowed examining the capability of laboratories to determine the activities of natural radionuclides at the equilibrium. (Author) 10 refs.

  18. El género, la edad, la formación profesional y la experiencia docente como factores diferenciadores del desempeño de los profesores en las evaluaciones adelantadas por los estudiantes de la universidad

    Directory of Open Access Journals (Sweden)

    JUAN VICENTE ORTIZ FRANCO

    2013-11-01

    Full Text Available Las prácticas evaluativas tradicionalmente se concentraban en la verificación de los aprendizajes de los estudiantes, reduciendo el uso de la evaluación universitaria y de los demás contextos institucionales solo a éste objeto evaluativo que con el reconocimiento cada vez más incluyente de las mismas, fue adquiriendo un carácter mucho más amplio, integral y holístico de la realidad universitaria. Estas nuevas maneras de poner en escena la evaluación universitaria se justifican en la medida que se va asumiendo y encontrando que la evaluación de la educación y específicamente de la calidad de los procesos formativos, resultan ser fenómenos complejos que requieren la observación de una amplia variedad de elementos, procesos, desarrollos, recursos, ambientes, prácticas y de eventos que ocurren en las universidades y que van constituyéndose en evidencias de la realidad institucional. La presente investigación buscó, efectuar una mirada sobre la evaluación de una población setecientos cincuenta y dos profesores, adelantada por la comunidad de estudiantes, en total diez y siete mil, que durante dos momentos evaluativos, dos semestres consecutivos, observaron sus desempeños. Se indagó sobre la incidencia de las características de género, edad, formación académica y la experiencia laboral en la evaluación que efectúan los estudiantes de los desempeños de sus profesores, según veinte características de desempeño incluidas en dos momentos evaluativos. Se establecieron análisis referentes con la existencia o no de diferencias significativas entre las medidas de las características agrupadas en factores de desempeño y entre las calificaciones totales de y cada una de las características de los profesores. Se observó de qué manera las calificaciones en cada uno de los cuatro desempeños están asociadas con las características de edad, experiencia, formación y género. Los hallazgos muestran que en las hipótesis en las que se comprueban los desempeños según género, mostraron diferencias entre hombres y mujeres en todos los factores: actitudinal, docencia, motivacional y disciplinar, siendo superior el desempeño de las mujeres docentes que el de los hombres. Las hipótesis en donde se comprueba el desempeño de los profesores según el título último alcanzado y que evidencia su nivel de preparación, muestra diferencias entre Técnicos y Licenciados, en donde los licenciados muestran el mayor rendimiento en el desempeño. Con relación a las hipótesis planteadas frente a la experiencia en años de ejercicio docente, se observa diferencia significativa en el desempeño pedagógico, lo cual permite inferir que a mayor experiencia en el campo de la docencia, se mejora y es un factor favorable al momento de ser calificado el desempeño de los profesores. La edad no incide en la calificación favorable por parte de los estudiantes en el momento de emitir un juicio sobre buena o mala docencia; se exceptúa aquellos grupos de rangos de edad inclinados hacia un extremo de edad avanzada. En cuanto a los años laborados éstos se constituyen en factores favorables para alcanzar un mejor desempeño pedagógico. Así mismo el tener mayor edad y mayor título académico no incide en el desempeño docente. El obtener las calificaciones más bajas en el desempeño pedagógico, permite observarlo como un factor determinante en la calificación favorable de los estudiantes y probablemente en una de las características de mayor peso que incide en el rendimiento. La relación entre años laborados y cada uno de los factores evaluados presente asociación significativa con el desempeño pedagógico. Así mismo no hay diferencia significativa en los desempeños docentes entre rangos de edad y último título.   

  19. Doppler ultrasound and magnetic resonance for evaluation of patients treated surgically for aortic coarctation. Ecografia Doppler y resonancia magnetica en la evaluacion de pacientes con coartacion de aorta operada

    Energy Technology Data Exchange (ETDEWEB)

    Canteli, B.; Saez, F.; Garcia, F.; Cabrera, A.; Galdeano, J.M.; Rodriguez, O. (Hospital de Cruzes, Vizcaya (Spain))

    1994-01-01

    Doppler ultrasound and magnetic resonance were performed in a series of 39 patients who had been treated surgically for aortic coarctation. The purpose was to assess the different Doppler gradients, comparing the findings with morphological data disclosed by magnetic resonance. The aortic caliber in the operative field was pathological in 7 patients (ratio between the caliber at the level of the lesion and that of descending aorta of less than 0.7). When the patients were considered as a group. Doppler ultrasound did not show satisfactory sensitivity (29%-43%), specificity (74%) or positive predictive value (17%-23%). Only the negative predictive value (85%-88%) presented more favorable results. When the Subgroup of patients without associated cardiac abnormalities or collateral circulation was studied alone, the following results were found: sensitivity, 100%; specificity, 81%-90%, positive predictive value, 33%-50%, negative predictive value, 100%, similar to those reported in the literature. Thus, we consider that Doppler ultrasound is a harmless and low cost diagnostic method that is highly suitable for follow-up of these patients, within certain limits. Magnetic resonance is the method of choice for the noninvasive assessment of aortic morphology. (Author)

  20. Reliability of electric generation units by evaluating the loss of power and efficiency of turbines; Confiabilidad de las unidades de generacion electrica mediante la evaluacion de la perdida de potencia y eficiencia de las turbinas

    Energy Technology Data Exchange (ETDEWEB)

    Ramirez Solis, Jose Antonio; Cristalinas Navarro, Victor Manuel [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2012-07-01

    The aim of the specialized technical service to evaluate the loss of power and efficiency of an open steam turbine is to quantify these losses caused by the deterioration of internal seals, deterioration of the steam path geometry components (nozzles and blades) and increased roughness of the blades and nozzle surface due to erosion (steam, humidity and impacts) and, also, due to salts deposition. In the same way, to establish a set of recommendations, in order of importance by the attention of the Power Plant with the purpose of recovering the major quantity of power and efficiency lost by the steam turbine and assurance, by means of technical supervision of the activities set in the recommendations, and in accordance with CFE rules, international standards and the personal experience of the Instituto de Investogaciones Electricas (IIE), staff, an acceptable quality in rehabilitation of mechanical components such as the maintenance of the steam turbine itself. Using an application example, this paper describes, the methodology of execution of this kind of services. Also, the quality of the maintenance and the rehabilitation of the steam turbine components are quantified. [Spanish] El objetivo del servicio tecnico especializado para evaluar la perdida de potencia y eficiencia de una turbina de vapor abierta es cuantificar dichas perdidas a causa del deterioro de los sellos internos, del deterioro la geometria de referencia de los componentes del canal de vapor (alabes fijos y alabes moviles) y del aumento de la rugosidad de la superficie de los alabes a causa de la erosion (marcas de vapor, de humedad y de impactos) y de la deposicion de sales. Asimismo, establecer una serie de recomendaciones en orden prioritario para la atencion de la central, con el fin de recuperar la mayor parte de la potencia y eficiencia perdidas por la turbina y asegurando, mediante la supervision tecnica de las actividades resultantes de las recomendaciones y conforme a la normativa de la Comision Federal de Electricidad (CFE), a la internacional y a la experiencia propia del personal del Instituto de Investogaciones Electricas (IIE), una calidad aceptable tanto en la rehabilitacion de los componentes mecanicos como del mantenimiento mismo de la turbina. Mediante un ejemplo de aplicacion, en este articulo se describe la metodologia de ejecucion de dicho servicio tecnico y se cuantifica la calidad, tanto del mantenimiento como de la rehabilitacion de los componentes de la turbina.

  1. Evaluaciones económicas de tecnologías sanitarias: una perspectiva global para su aplicación en América Latina Economic evaluations of health technologies: a global perspective for their implementation in Latin America

    Directory of Open Access Journals (Sweden)

    Manuel Espinoza

    2011-09-01

    Full Text Available Fenómenos como el aumento progresivo del gasto en salud y el envejecimiento poblacional han obligado a los distintos países a considerar metodologías económicas que permitan obtener un mayor beneficio sanitario dentro de un contexto de recursos limitados. El presente artículo describe los componentes básicos a considerar en una evaluación de tecnología sanitaria, analiza el proceso de toma de decisión en un análisis de costo efectividad y reporta como dicha metodología ha