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Sample records for bolsa chica-1 reactor

  1. bolsa

    Directory of Open Access Journals (Sweden)

    David Quintana Montero

    2007-01-01

    Full Text Available Este artículo aborda el fenómeno del rendimiento inicial de las salidas a bolsa a través de modelos que consideran la cuestión tanto desde un punto de vista longitudinal como transversal. La propuesta consiste en una forma de incorporar tanto la inercia del mercado primario como información relacionada con la estructura de la colocación al estudio de casos concretos. Los resultados ponen de manifiesto una mejora substancial de la capacidad explicativa de las regresiones empleadas.

  2. BioColBolsas

    OpenAIRE

    Vásquez Suárez, Nicolás; Perdomo Porras, Karen

    2013-01-01

    Este proyecto presenta un modelo de negocio enfocado a la comercialización de bolsas plásticas biodegradables ayudando a disminuir el impacto negativo que generan al planeta las bolsas plásticas tradicionales debido a su uso indiscriminado. La propuesta del negocio ofrece no sólo un producto que brinda una solución amigable sino también la posibilidad de construir, gestionar, y transmitir conocimiento, conciencia y responsabilidad frente al medio ambiente. Se quiere implementar un nuevo...

  3. As novas estruturas organizacionais das bolsas

    OpenAIRE

    Marcos Galileu Lorena Dutra

    2008-01-01

    O presente trabalho investiga as novas estruturas organizacionais das bolsas de valores e das bolsas de mercadorias e futuros, implementadas após os processos de desmutualização. É feita uma análise da importância das bolsas para o desenvolvimento econômico, bem como do seu papel de entidades auto-reguladoras. São ainda apresentados os principais fatores que motivaram a conversão das bolsas de associações mutualísticas para sociedades anônimas, bem como as conseqüências dessa alteração organi...

  4. Reactors

    CERN Document Server

    International Electrotechnical Commission. Geneva

    1988-01-01

    This standard applies to the following types of reactors: shunt reactors, current-limiting reactors including neutral-earthing reactors, damping reactors, tuning (filter) reactors, earthing transformers (neutral couplers), arc-suppression reactors, smoothing reactors, with the exception of the following reactors: small reactors with a rating generally less than 2 kvar single-phase and 10 kvar three-phase, reactors for special purposes such as high-frequency line traps or reactors mounted on rolling stock.

  5. Cisto de bolsa de Rathke: relato de caso

    OpenAIRE

    2003-01-01

    Os cistos de bolsa de Rathke são achados relativamente comuns em autópsias, mas raramente são reportados como entidade clínica. Relatamos o caso de uma paciente de 66 anos com diminuição de acuidade visual e cuja investigação radiológica evidenciou cisto de bolsa de Rathke. Enfatizamos aspetos como apresentação clínica, estudos radiológicos e manejo da lesão. Foram revisadas séries publicadas a respeito desta patologia e comparadas com o caso em questão.

  6. Bolsa Bay, California, Proposed Ocean Entrance System Study. Report 2. Comprehensive Shoreline Response Computer Simulation, Bolsa Bay, California

    Science.gov (United States)

    1990-04-01

    1980). 27. The success of the inlet channel at Agua Hedionda indicates that a stable non-navigable entrance at Bolsa Chica could be feasible provided a...dual jetty system similar to Agua Hedionda is incorporated into the design. However, structures that penetrate into the active surf zone are expected...and from the south in the summer months. i. The surfbreak rarely closes out. j. Surfing is best in the morning before the sea breeze becomes strong. 13

  7. Reactor

    Science.gov (United States)

    Evans, Robert M.

    1976-10-05

    1. A neutronic reactor having a moderator, coolant tubes traversing the moderator from an inlet end to an outlet end, bodies of material fissionable by neutrons of thermal energy disposed within the coolant tubes, and means for circulating water through said coolant tubes characterized by the improved construction wherein the coolant tubes are constructed of aluminum having an outer diameter of 1.729 inches and a wall thickness of 0.059 inch, and the means for circulating a liquid coolant through the tubes includes a source of water at a pressure of approximately 350 pounds per square inch connected to the inlet end of the tubes, and said construction including a pressure reducing orifice disposed at the inlet ends of the tubes reducing the pressure of the water by approximately 150 pounds per square inch.

  8. La Nueva Bolsa de Londres - Gran Bretaña

    Directory of Open Access Journals (Sweden)

    Llewellyn-Davies, Richard

    1974-06-01

    Full Text Available It will occupy the space of the present Stock Exchange of the capital of the United Kingdom, between Throgmorton, Bartholomew, Threadneedle and Old Bross streets Due to its evident insufficiency it has been necessary to enlarge the old building - by constructing a high block of 26 stories intended to accomodate the administrative council of the Stock Exchange in the first eleven, various offices in another eleven and installations in the four remaining ones. Likewise a spacious business hall without intermediate columns has been constructed surrounded by smaller office rooms for the Stock Exchange agents. The general construction of the tower is carried out with a core, poured in site, with the vertical circulations —eight lifts, two winches and two staircases—, W.C.s and cavities for various conductions and the sides of the polygon formed by prefabricated alternating members, some of them hollow to accomodate the installations and some solid, as structural elements. The construction was carried out in three phases: I tower; II business hall. Brokers and public relations block; III demolition of old parts.Ocupará el lugar que alberga la actual Bolsa de la capital del Reino Unido, entre las calles Throgmorton, Bartholomew Threadneedle y Old Broad. Dada su manifiesta insuficiencia ha sido preciso ampliar el viejo edificio construyendo un bloque alto, de veintiséis plantas, destinado a acomodar: el Consejo y Administración de la Bolsa, en las once primeras; oficinas varias, en otras once, y las instalaciones, en las cuatro restantes. Se ha creado, asimismo, un amplio salón de operaciones sin pilares intermedios, rodeado de despachos más pequeños para los agentes de Bolsa. La construcción general de la torre está materializada por un núcleo, hormigonado in situ, con las circulaciones verticales —ocho ascensores, dos montacargas y dos escaleras—, aseos y huecos para conducciones varias, y los lados del polígono formados por

  9. Autoimagem de clientes com colostomia em relação à bolsa coletora

    Directory of Open Access Journals (Sweden)

    Maria do Rosário de Fátima Franco Batista

    2011-12-01

    Full Text Available Objetivou-se analisar a percepção do portador de colostomia em relação ao uso da bolsa coletora. Realizou-se uma pesquisa descritiva com abordagem qualitativa, no Centro Integrado de Saúde Lineu Araújo, Teresina-PI. Participaram da pesquisa dez clientes portadores de bolsa de colostomia. Os dados foram produzidos por meio de entrevistas semiestruturadas. A análise de conteúdo permitiu revelar os sentimentos, as mudanças ocorridas e como acontece o processo de adaptação da pessoa portadora da bolsa de colostomia. Constatou-se que a relação entre a pessoa portadora de colostomia e a bolsa coletora é permeada por sentimentos negativos, mudanças significativas de ordem físicas, psicológicas, sexuais, bem como na teia de suas relações sociais.

  10. Cistos de bolsa de Rathke: diagnóstico e tratamento

    Directory of Open Access Journals (Sweden)

    Rodrigues Flávio Freinkel

    2001-01-01

    Full Text Available Estudamos retrospectivamente quatro pacientes com cisto de bolsa de Rathke. Chamamos a atenção para a apresentação clínica e para o tratamento destas lesões. Todos ocorreram em pacientes do sexo feminino. Os sintomas predominantes foram amenorréia, cefaléia e déficit visual. Revisamos várias séries publicadas de cistos de bolsa de Rathke. Concluimos que o tratamento cirúrgico é ainda a melhor conduta e que a via transesfenoidal é a abordagem mais indicada.

  11. Bolsa Família e desigualdade da renda domiciliar entre 2006 e 2011 = Bolsa Família and inequality of household income between 2006 and 2011

    Directory of Open Access Journals (Sweden)

    Carvalho, Cleusení Hermelina de

    2014-01-01

    Full Text Available Os programas de transferência condicionada de renda têm crescentemente desempenhado um papel importante no combate à pobreza em vários países da América Latina, principalmente no Brasil. O objetivo deste artigo é analisar a contribuição do programa Bolsa Família na diminuição da desigualdade da renda domiciliar per capita no Brasil, entre 2006 e 2011. Para isso, analisa-se a participação relativa de oito fontes de renda – trabalho, aposentadorias, programa Bolsa Família (variável proxy, pensões, abonos, doações, aluguéis e juros – no Brasil e nas suas cinco macrorregiões. Assim, além do artigo detalhar a técnica matemática utilizada para decompor o Índice de Gini, apresenta e discute os resultados empíricos encontrados para o Brasil e suas macrorregiões. Dentre os resultados, destaca-se a capacidade do programa Bolsa Família em contribuir para a queda da desigualdade da renda domiciliar nacional, o que se explica por sua acentuada focalização

  12. Inventory and Evaluation of Cultural Resources, Bolsa Chica Mesa and Huntington Beach Mesa, Orange County, California

    Science.gov (United States)

    1989-09-30

    especially groves of eucalyptus . Ground visibility was generally fair to good. Most of Bolsa Chica Mesa is covered by agricultural fields, although some oil...This is the essence of site significance evaluations, and ultimately should be the goal of the testing program. Methods Because the nature of sites and

  13. Bolsa Família (Family Grant) Programme: an analysis of Brazilian income transfer programme

    NARCIS (Netherlands)

    L. Mourao (Luciana); A. Macedo de Jesus (Anderson)

    2012-01-01

    markdownabstract__Abstract__ Income transfer programmes are common in various countries and play an important role in combating poverty. This article presents a review of the results of the Bolsa Família (Family Grant) Programme, implemented in Brazil by the government of Lula da Silva in 2004. Ove

  14. Income transfer policies and the impacts on the immunization of children: the Bolsa Família Program.

    Science.gov (United States)

    Andrade, Mônica Viegas; Chein, Flávia; Souza, Laetícia Rodrigues de; Puig-Junoy, Jaume

    2012-07-01

    This paper investigates the impact of the Bolsa Família Program on the immunization of children from 0 to 6 years of age in Brazil and its regions. The Bolsa Família program is a conditional cash transfer program. One of its conditionalities is the compliance of children with the immunization schedule ordered by the Ministry of Health. The evaluation was performed using the Propensity Score Matching technique. We used data from a survey conducted in 2005 evaluating the program - Pesquisa de Avaliação de Impacto do Programa Bolsa Família. The main findings suggest that the Bolsa Família Program does not affect the immunization status of children.

  15. The Brazilian Experience with CCTs : Bolsa Familia's impacts on children's schooling and time allocation

    OpenAIRE

    Santos, Emylli Helmer

    2012-01-01

    The Bolsa Familia (PBF) is a Conditional Cash Transfer (CCT) programme that has been in place in Brazil since 2003. Following the main features of other CCTs, in order to receive the cash transfers, the beneficiary families have to comply with the programme’s terms which concern mainly their children’s nutritional, health and educational situation. In this dissertation, I will present the programme’s impacts on children’s school attendance and time allocation between school and labour market ...

  16. Nuclear Reactors

    Energy Technology Data Exchange (ETDEWEB)

    Hogerton, John

    1964-01-01

    This pamphlet describes how reactors work; discusses reactor design; describes research, teaching, and materials testing reactors; production reactors; reactors for electric power generation; reactors for supply heat; reactors for propulsion; reactors for space; reactor safety; and reactors of tomorrow. The appendix discusses characteristics of U.S. civilian power reactor concepts and lists some of the U.S. reactor power projects, with location, type, capacity, owner, and startup date.

  17. A produção da maternidade no Programa Bolsa-Escola The production of maternity in the Bolsa-Escola Program

    Directory of Open Access Journals (Sweden)

    Carin Klein

    2005-04-01

    Full Text Available Neste trabalho, analiso alguns processos de produção e veiculação de representações de maternidade, tomando como referência o Programa Nacional Bolsa-Escola. Meu estudo insere-se nos campos dos Estudos Culturais e dos Estudos Feministas, nas vertentes que têm proposto uma aproximação crítica com a abordagem pós-estruturalista. Para a operacionalização da pesquisa, selecionei um conjunto de documentos referentes a esse Programa, produzidos e publicados no período de 1999 a 2003. Exploro os textos do Programa tomando como base os conceitos de discurso, representação, identidade, gênero e poder com o intuito de analisar os diferentes modos pelos quais a maternidade é, ali, representada e significada.In this work I analyze some processes of production and conveyance of maternity representations, having the Programa Nacional Bolsa-Escola as its reference. My study is located in the field of cultural theory, mainly in the Cultural Studies and Feminist Studies perspectives, in approaches that have proposed a critical approximation to the post-structuralist analysis. In order to perform this research, I selected a set of documents related to the Program, which were produced and published from 1999 to 2003. I have explored the texts of the Program on the basis of concepts such as discourse, representation, identity, gender and power, aiming at analyzing the different ways by which maternity has been represented and signified there.

  18. Reestruturação nas Bolsas de Valores: desmutualização e outras mudanças

    OpenAIRE

    Hori, Caio Buonvento

    2010-01-01

    O objetivo deste trabalho é estudar o processo de mudança na organização industrial nas bolsas de valores desde os anos 90, quando elas começaram a se desmutualizar, além de ampliarem os processos de integração e de estabelecimento de parcerias estratégicas, fatos não comuns para estas instituições até então. A análise parte da mudança ocorrida nas bolsas de mercados desenvolvidos e acompanha sua expansão para os países em desenvolvimento, constatando que as principais bolsas mundiais já ader...

  19. Programa Bolsa Família e o empoderamento das mulheres em Minas Gerais

    OpenAIRE

    Moreira, Nathalia Carvalho

    2010-01-01

    O empoderamento na perspectiva de gênero emergiu como um tema importante no campo das políticas públicas. Por isso, este trabalho teve como objetivo analisar as dimensões do empoderamento alcançadas pelas mulheres beneficiárias do Programa de Transferência de Renda, conhecido como “Programa Bolsa Família”, a percepção dos agentes sociais dos Centros de Referência de Assistência Social (CRAS) sobre o empoderamento das mulheres, assim como o impacto da transferência de renda sobre o...

  20. Bolsas de plástico y lazos sociales. Notas de campo sobre reciclaje

    OpenAIRE

    Cecilia Montero Mórtola

    2011-01-01

    La protección del medio ambiente no sólo consiste en grandes campañas mediáticas y políticas. Existe una ciudadanía silenciosa que ha empezado a modificar actitudes, rescatar viejas costumbres y adaptarlas a distintos espacios de este mundo globalizado (domésticos, informales...). Un cambio cultural donde la reutilización de objetos desechados, a través de actividades artesanales y educativas, sirve para poner en marcha una serie de vínculos y lazos sociales. Estudiando el reciclaje de bolsas...

  1. Desempenho de estimadores de volatilidade na bolsa de valores de São Paulo

    Directory of Open Access Journals (Sweden)

    Bernardo de Sá Mota

    2004-09-01

    Full Text Available O objetivo deste artigo é avaliar o desempenho de diferentes métodos de extração da volatilidade do Índice da Bolsa de Valores de São Paulo (IBOVESPA tendo como referência a volatilidade realizada. Comparamos modelos da família GARCH com estimadores alternativos baseados em cotações de abertura, fechamento, máximo e mínimo. Os resultados indicam que os estimadores alternativos são tão precisos quanto os modelos do tipo GARCH, apesar de serem muito mais econômicos em termos computacionais.

  2. Diseño, fabricación y comercialización de bolsas biodegradables

    OpenAIRE

    Díaz Cajiao, Samuel Fernando; Hurtatiz Hernández, Alvaro Roosvel

    2012-01-01

    El plástico y sus derivados, son productos de inmensa utilidad, esto se puede evidenciar en sus aplicaciones en la medicina, la tecnología y en la conveniencia que ofrecen en muchas actividades cotidianas. El problema radica en el uso que se le da, así como la forma como se desecha después de su uso, tal es el caso de las bolsas plásticas usadas en los supermercados. Desarrollar un plan de negocio con miras a determinar y evaluar la viabilidad de crear una empresa cuyo producto estrella s...

  3. El diseño de un juego autogenerativo de títulos de bolsa

    OpenAIRE

    2004-01-01

    Contando el establecimiento de la función generadora de precios aleatorios, se desarrolla la metodología básica para la construcción de un modelo simulador de juego de bolsa que sea capaz de generar las propias variaciones de los precios de las acciones. El artículo realiza la presentación estructurada de modelo, partiendo de las bases teóricas para la elaboración de la formulación. La generación de números aleatorios distribuidos mediante la función normal es...

  4. Las bolsas de valores en el area del TLCAN: un analisis a largo plazo

    OpenAIRE

    Édgar Ortiz; Francisco Lopéz Herrera; Alejandra Cabello

    2007-01-01

    En este documento se analiza el proceso de integración de los mercados de capitales de los países que integran Tratado de Libre Comercio de América del Norte (TLCAN) durante el periodo 1984-2002, mediante un modelo econométrico que captura sus relaciones a largo plazo. Las pruebas de raíces unitarias de Perron (1989) y Zivot y Andrews (1992) permiten identificar cambios estructurales en el Índice de Precios y Cotizaciones (IPC) de la Bolsa Mexicana de Valores (BMV). El estudio de las relac...

  5. As interrelações envolvendo as principais Bolsas de Valores mundiais: um enfoque utilizando séries temporais

    OpenAIRE

    BATISTA, Arturo Toscanini Soares

    2009-01-01

    As alocações de recursos financeiros em aplicações de bolsas de valores passam por análise dos diversos mercados bursáteis. Nesse sentido, este estudo buscou como objetivo principal a análise das inter-relações existentes entre as bolsas de valores do G7 (grupo dos sete países mais economicamente desenvolvidos) e do BRIC (grupo dos quatro principais países emergentes da atualidade). Para concretização desse objetivo, foram utilizados séries temporais dos principais índices dos ...

  6. Incidencia del Mercado Integrado Latinoamericano (MILA) en cada una de las bolsas de valores que lo componen

    OpenAIRE

    Vargas Sierra, Carlos Arturo; Castaño Calle, Catherine

    2015-01-01

    Este documento tiene como propósito establecer la incidencia que tiene el Mercado Integrado Latinoamericano (MILA) sobre las bolsas que la componen (Chile, Perú y Colombia) -- Para el desarrollo del trabajo se corren modelos econométricos que evidenciarán si los rendimientos de las bolsas de valores de los países que conforman esta integración bursátil se han visto influenciados por los rendimientos del MILA, así como también determinarán si la ocurrencia de la integración genera algún cambio...

  7. Motivações para comprar objeto de luxo: Bolsas LV

    Directory of Open Access Journals (Sweden)

    Luis Alexandre Grubits de Paula Pessôa

    2012-10-01

    Full Text Available Este estudo exploratório investigou motivações que levam mulheres de classe média a adquirir um objeto de luxo, apesar do impacto da compra em seu orçamento. Baseado no modelo das cadeias meios-fim, conduziram-se entrevistas com 15 mulheres que adquiriram algum modelo genuíno de bolsa Louis Vuitton. Os resultados sugerem que os grupos de referência exercem tanto influência normativa quanto de identificação na decisão de compra. Mais importante do que os atributos do acessório declarados, as mulheres entrevistadas consideram que a posse e a ostentação da bolsa conferem a elas status e prestígio em seus grupos de referência, criando também a sensação de serem aceitas em grupos de aspiração, elevando a autoestima e levando-as a se perceberem profissionalmente bem sucedidas, valores individuais que parecem ser os reais motivadores da decisão de compra.

  8. Influence of the Bolsa Família program on nutritional status and food frequency of schoolchildren

    Directory of Open Access Journals (Sweden)

    Ariene Silva do Carmo

    2016-08-01

    Full Text Available Abstract Objective To evaluate the food frequency and nutritional status among students according to participation in the Bolsa Família program funded by the government. Methods Cross-sectional study carried out with students from the fourth grade of elementary school in the municipal capital of the southeastern region of Brazil. Food consumption and anthropometry were investigated by a questionnaire administered in school, while participation in the Bolsa Família program and other socio-economic information was obtained through a protocol applied to mothers/guardians. Statistical analysis included the Mann–Whitney test, the chi-squared test, and Poisson regression with robust variance, and the 5% significance level was adopted. Results There were 319 children evaluated; 56.4% were male, with a median of 9.4 (8.6–11.9 years, and 37.0% were beneficiaries of Bolsa Família program. Between the two groups, there was high prevalence of regular soda consumption (34.3%, artificial juice (49.5%, and sweets (40.3%, while only 54.3% and 51.7% consumed fruits and vegetables regularly, respectively. Among participants of Bolsa Família program, a prevalence 1.24 times higher in the regular consumption of soft drinks (95% CI: 1.10–1.39 was identified compared to non-beneficiaries. The prevalence of overweight was higher in the sample (32.9%, with no difference according to participation in the program. Conclusion The study found increased consumption of soft drinks among BFP participants. The high rate of overweight and poor eating habits denote the need to develop actions to promote healthy eating, especially for the beneficiaries of the Bolsa Família program, to promote improvements in nutritional status and prevent chronic diseases throughout life.

  9. Difusión de tecnología desde una perspectiva histórico-social. El caso de las bolsas para sangre en la Argentina

    OpenAIRE

    Díaz de Guijarro, Eduardo

    2004-01-01

    Díaz de Guijarro, E. (2016). Difusión de tecnología desde una perspectiva histórico-social. El caso de las bolsas para sangre en la Argentina. (Tesis de posgrado). Universidad Nacional de Quilmes, Bernal, Argentina El tema central de esta tesis es el desarrollo de las bolsas para sangre en la Argentina, especialmente la fase comenzada en 1976 en una empresa local, proceso que desembocó en la fabricación de una línea completa de bolsas para sangre que sigue utilizándose en la actualidad. Se...

  10. Bolsas de plástico y lazos sociales. Notas de campo sobre reciclaje

    Directory of Open Access Journals (Sweden)

    Cecilia Montero Mórtola

    2011-01-01

    Full Text Available La protección del medio ambiente no sólo consiste en grandes campañas mediáticas y políticas. Existe una ciudadanía silenciosa que ha empezado a modificar actitudes, rescatar viejas costumbres y adaptarlas a distintos espacios de este mundo globalizado (domésticos, informales.... Un cambio cultural donde la reutilización de objetos desechados, a través de actividades artesanales y educativas, sirve para poner en marcha una serie de vínculos y lazos sociales. Estudiando el reciclaje de bolsas de plástico, la antropología puede restituir esos curiosos procesos organizativos, prácticas sociales sólo visibles a partir de un trabajo de campo continuado.

  11. Las bolsas de valores en el area del TLCAN: un analisis a largo plazo

    Directory of Open Access Journals (Sweden)

    Édgar Ortiz

    2007-01-01

    a largo plazo. Las pruebas de raíces unitarias de Perron (1989 y Zivot y Andrews (1992 permiten identificar cambios estructurales en el Índice de Precios y Cotizaciones (IPC de la Bolsa Mexicana de Valores (BMV. El estudio de las relaciones de largo plazo entre estos mercados se basa en el modelo de Johansen, Mosconi y Nielsen (2000 que extiende el análisis de cointegración para el caso en que se presentan cambios estructurales. La evidencia empírica sugiere que la integración entre los mercados de capitales del tlcan es cambiante en el tiempo, con periodos en los que incluso disminuye la intensidad de sus relaciones.

  12. Efeitos do Programa Bolsa Família na fecundidade das beneficiárias

    Directory of Open Access Journals (Sweden)

    Patrícia Simões

    2012-12-01

    Full Text Available Procuramos verificar se o Programa Bolsa Família contribui para aumentar a fecundidade entre as beneficiárias, visto que o aumento no tamanho da família, até certo limite, leva ao aumento dos benefícios. Utilizamos um modelo de contagem no qual testamos e tratamos a possibilidade de endogeneidade da variável de política por dois métodos distintos (dois-estágios estilo Heckman e GMM, além de incluir diversos cofatores da PNDS (2006. Os resultados mostram que o PBF não apresentou este efeito, pelo menos no início do programa. Pelo contrário, beneficiárias pareciam mais inclinadas a trocar quantidade por qualidade do que não beneficiárias elegíveis ao programa.

  13. Armazenamento de soja em silos tipo bolsa Soybean storage in bag type silos

    Directory of Open Access Journals (Sweden)

    Lêda R. A. Faroni

    2009-03-01

    Full Text Available Avaliaram-se as principais alterações qualitativas de soja armazenada em silos tipo bolsa e do óleo bruto extraído de soja com teores de água de 17,4% e 13,3%, armazenada em dois silos tipo bolsa, por 180 dias. Realizaram-se amostragens no dia do enchimento das bolsas, aos 30; 90 e 180 dias de armazenamento. Analisaram-se o teor de água, a condutividade elétrica, o percentual de germinação, a massa específica aparente da soja, além do teor de ácidos graxos livres e o índice de peróxido do óleo bruto extraído dela. Os teores de água da soja armazenada úmida e seca mantiveram-se próximos dos valores obtidos no início do período de armazenamento. Observou-se tendência de elevação da condutividade elétrica e decréscimo do percentual de germinação somente na soja úmida, principalmente após 90 dias de armazenamento. Não foi verificado decréscimo da massa específica aparente do material armazenado úmido e seco. Com relação aos parâmetros qualitativos do óleo bruto, observou-se que os valores obtidos se mantiveram abaixo do limite máximo exigido pela legislação para a comercialização de óleo bruto de soja. Pode-se concluir que os silos tipo bolsa representam alternativa viável do ponto de vista qualitativo para armazenagem de soja, e esse tipo de estrutura não ocasiona alterações qualitativas significativas no óleo bruto obtido desse material, em condições similares àquelas deste estudo.This study reports major qualitative changes in the soybean grains and the extracted crude oil when stored in bag type silos. Grains with moisture content of 17.4 or 13.3% were stored in two bag type silos. Samples were taken 30, 90 and 180 days of storage , to determine moisture content, electric conductivity of the grain leachate, germination percentage, apparent specific grain mass, and free fatty acid content, and peroxide index of the crude oil extracted from these grains. The wet and dry grains remained with

  14. Um olhar neoinstitucionalista para o Programa Bolsa Família

    Directory of Open Access Journals (Sweden)

    Luísa de Azevedo Nazareno

    2015-03-01

    Full Text Available O Programa Bolsa Família (PBF é um programa de transferência condicionada de renda que vem sendo implementado no Brasil desde 2003 e atinge hoje milhões de famílias, tendo trazido inovações importantes tanto no desenho do programa como em sua gestão. Seus impactos sociais positivos têm sido amplamente discutidos pela literatura, contudo, o PBF também deve ser analisado sob o ponto de vista de inovações institucionais. Neste trabalho, partimos do neoinstitucionalismo histórico para discutir a gestão do PBF e algumas de suas inovações, tais como a criação do Cadastro Único e a gestão compartilhada e descentralizada.

  15. [The impact of conditional cash transfers on health status: the Brazilian Bolsa Familia Programme].

    Science.gov (United States)

    Rivera Castiñeira, Berta; Currais Nunes, Luis; Rungo, Paolo

    2009-01-01

    Conditional cash transfers are becoming the standard approach to reducing poverty levels; the Brazilian Bolsa Familia Program, in particular, is the largest program of this kind, and the evaluation of its impact allows for drawing some interesting conclusions, which may apply to other countries. In this paper, the lack of positive results in terms of both health status and modification of unhealthy habits is underlined. Among different causes, which are discussed here, the existence of barriers on the supply side appears as the most important limitation for obtaining better results. The positive impact of this program on both education and poverty reduction however, allows for predicting improvements in health status in the long run.

  16. Percepções sobre o Programa Bolsa Família na sociedade brasileira

    Directory of Open Access Journals (Sweden)

    Henrique Carlos de Oliveira de Castro

    2009-11-01

    Full Text Available O artigo trata de percepções da sociedade brasileira sobre o Programa Bolsa Família (PBF a partir de uma pesquisa realizada em amostra da população. A pesquisa indicou que a população reconhece o Programa e entende que ele está sendo utilizado de forma adequada, mesmo considerando problemas em sua execução. Houve uma importante diferença entre a opinião daqueles que conhecem beneficiários em relação àqueles que não conhecem, sendo que os primeiros se manifestaram de forma mais positiva em relação aos resultados e mais cautelosos em relação às críticas, conclui que o PBF adquiriu legitimidade junto à sociedade brasileira dado o nível de conhecimento da política e mesmo de apoio à sua existência e argumenta sobre a importância de buscar e considerar a opinião da sociedade como importante elemento de avaliação de políticas públicas.The paper is about perceptions of Brazilian society concerning the cash transfer program Bolsa Família of Brazilian government obtained in a national survey. It indicated that population recognizes the program and understands that it is being used in an appropriated way, even though considering problems in its execution. Important differences occurred in the opinion of those who knew beneficiaries comparing with those who didn't. The first group manifested positive opinion and criticized less then the second. The paper concludes that the program acquired legitimacy in the Brazilian society, considering the knowledge of this policy and supporting its existence. It argues for the importance of searching and considering the public opinion as a fundamental element of public policy assessing.

  17. Programa Bolsa Família e estado nutricional infantil: desafios estratégicos Bolsa Família Program and child nutritional status: strategic challenges

    Directory of Open Access Journals (Sweden)

    Fabiana de Cássia Carvalho Oliveira

    2011-07-01

    Full Text Available Anemia e desnutrição, principais carências nutricionais na infância, têm como principais determinantes os socioeconômicos. Assim, por se tratar da principal política de combate à pobreza, espera-se que o Programa Bolsa Família (PBF promova impacto no estado nutricional infantil. Objetivou-se analisar as diferenças na situação nutricional de crianças cadastradas no PBF de um município da Zona da Mata Mineira. Foram avaliadas 446 crianças com idade entre 6 e 84 meses, sendo que 262 eram beneficiárias e 184 não-beneficiárias. A avaliação nutricional constituiu-se da análise dos parâmetros peso e estatura, através dos índices peso/idade, peso/estatura, estatura/idade e Índice de Massa Corporal/idade, e dos níveis de hemoglobina, com uso do Hemocue. As prevalências de anemia, déficit estatural e obesidade foram 22,6, 6,3 e 5,2%, respectivamente, sendo que não houve diferença estatística entre os beneficiários e não-beneficiários. Inicialmente, o grupo beneficiário apresentava piores condições socioeconômicas, porém, com o recebimento do benefício, os grupos se igualaram financeiramente. É possível que a similaridade dos dois grupos também quanto ao estado nutricional possa ser atribuída ao recebimento do benefício, tanto devido ao incremento financeiro, quanto ao acompanhamento nutricional exigido como condicionalidade do programa.The main nutritional deficiencies during childhood, namely anemia and malnutrition, are predominantly related to socio-economic factors. Thus, as the Bolsa Família Program (BFP is the main policy to combat poverty, it is expected that it will have an impact on child nutrition. The aim was to analyze the differences in the nutritional situation of children registered with the BFP of a municipality located in Zona da Mata of Minas Gerais state. 446 children aged between 6 and 84 months were evaluated, of which 262 were non-beneficiaries and 184 were beneficiaries. Nutritional

  18. IMPACTO DE LA MUJER DIRECTIVA EN LA SALIDA A BOLSA DE EMPRESAS DE ALTA TECNOLOGIA: EL EFECTO MEDIADOR DE LAS PATENTES Y EL DESARROLLO DE PRODUCTOS

    OpenAIRE

    Quintana Garcia, Cristina

    2016-01-01

    Este trabajo examina la relacion entre la presencia de la mujer en los equipos de alta direcciony el exito de las empresas de alta tecnologia en su salida a bolsa. Asimismo, analiza como indicadores especificos de capacidad de innovacion pueden mediar dicha relacion La investigacion empirica de una muestra de empresas biotecnologicas que salieron a bolsa en el mercado de valores estadounidense indica un efecto negativo y significativo de la proporcion de mujeres en la direccion ejecutiva, au...

  19. Sistema mecánico abre bolsas: un ejemplo práctico para la enseñanza

    Directory of Open Access Journals (Sweden)

    Ervin Alvarez-Sánchez

    2015-01-01

    Full Text Available En este artículo se presenta la manera de obtener un modelo matemático simplificado de un sistema mecánico abre bolsas, con la finalidad de ejemplificar los conocimientos que se obtienen usualmente en el curso de dinámica de mecanismos, tales como: equilibrio dinámico de partículas, movimiento de proyectiles y fuerzas de fricción. Con la ayuda de este modelo, se puede llevar a cabo el diseño mecánico del sistema abre bolsas para que sea posteriormente implementado en una planta de reciclaje de residuos sólidos.

  20. Income transfer policies and the impacts on the immunization of children: the Bolsa Família Program Programas de transferência de renda e impactos na imunização das crianças: o Programa Bolsa Família

    Directory of Open Access Journals (Sweden)

    Mônica Viegas Andrade

    2012-07-01

    Full Text Available This paper investigates the impact of the Bolsa Família Program on the immunization of children from 0 to 6 years of age in Brazil and its regions. The Bolsa Família program is a conditional cash transfer program. One of its conditionalities is the compliance of children with the immunization schedule ordered by the Ministry of Health. The evaluation was performed using the Propensity Score Matching technique. We used data from a survey conducted in 2005 evaluating the program - Pesquisa de Avaliação de Impacto do Programa Bolsa Família. The main findings suggest that the Bolsa Família Program does not affect the immunization status of children.Este artigo investiga os impactos do Programa Bolsa Família na imunização de crianças de 0 a 6 anos no Brasil e grandes regiões. O Bolsa Família é um programa de transferência condicional de renda. Uma das condicionalidades do Programa Bolsa Família é a atualização do calendário vacinal preconizado pelo Ministério da Saúde. A avaliação é realizada utilizando a técnica do Matching com escore de propensão. Os dados utilizados são da pesquisa conduzida em 2005 para avaliar o programa Pesquisa de Avaliação de Impacto do Programa Bolsa Família. Os principais resultados mostram que o Bolsa Família não afetou o status de imunização das crianças em 2005.

  1. ASSESSING PREFERENCES FOR COMPENSATION PACKAGES USING THE DISCRETE CHOICE METHOD: THE CASE OF THE BOLSA FLORESTA PROGRAM IN AMAZONAS, BRAZIL

    OpenAIRE

    ESSAM YASSIN MOHAMMED; INA PORRAS; MARYANNE GRIEG-GRAN; LUIZA LIMA; AFRIANO SOARES; JOÃO TEZZA NETO; VIRGILIO VIANA

    2013-01-01

    Natural ecosystems, including forest ecosystems, continue to be degraded or converted at an alarming rate. To complement or substitute regulatory approaches to ecosystem management, market-based instruments such as "payments for ecosystem services" (PES) have been introduced and are gaining popularity. One of the prominent PES schemes in the world is the Bolsa Floresta Program (BFP) in the State of Amazonas, Brazil. The BFP was established by the Government of the State of Amazonas through it...

  2. EVALUACIÓN DE LA CALIDAD MICROBIOLÓGICA DEL AGUA ENVASADA EN BOLSAS PRODUCIDA EN SINCELEJO- COLOMBIA

    Directory of Open Access Journals (Sweden)

    Jhon Vidal D

    2009-08-01

    Full Text Available Objetivo. Evaluar la calidad microbiológica y fisico-quimica del agua envasada en bolsas producidad en la ciudad de Sincelejo-Colombia con destino al consumo humano. Materiales y métodos. Para la estimación de organismos coliformes totales y fecales, Pseudomona aeruginosa y mesófilos en el agua envasada de 13 marcas, se utilizó el método de filtración por membrana (FxM. Resultados. El 92 % de las marcas de agua envasada en bolsa que se produce en la ciudad de Sincelejo presentaron bacterias mesófilas en su producto, mientras que en el 33% de ellas se encontraron coliformes totales. Cabe destacar que una marca presentó coliformes fecales, otra Pseudomonas aeruginosa y el reporte microbiano fue mayor en las envasadoras que poseían registro INVIMA. Conclusiones. Gran parte del agua envasada en bolsas de la ciudad de Sincelejo genera un riesgo a la salud de los consumidores, debido a la presencia de microorganismos patógenos, lo que está relacionado con inadecuados procesos de producción y a la intermitencia del suministro del agua utilizada como materia prima.

  3. Redes Neuronales y su aplicación predictiva en la Bolsa de Valores española

    Directory of Open Access Journals (Sweden)

    Ibarra Alfaraz, J.A.

    1999-01-01

    Full Text Available Este trabajo recoge una visión general de las redes neuronales y su tendencia en la investigación actual. Además de las aplicaciones conocidas donde las redes neuronales han demostrado su aplicabilidad se abren nuevos campos de investigación. En nuestro caso, nos centraremos en el área económica y más concretamente en la financiera. Esta metodología se aplica al caso concreto del análisis predictivo de la bolsa de valores, concretamente se utiliza el índice del mercado continuo de la bolsa española, Ibex-35, y los recientemente aparecidos índices sectoriales del Ibex: Servicios, Financiero, Utilities y Complementario. La red neuronal utilizada, Perceptron, ha sido entrenada con los datos reales procedentes de la bolsa de valores utilizando diferentes periodos de tiempo y efectuando cambios en los parámetros que condicionan la capacidad predictiva de la red. Los resultado se han contrastado con los obtenidos en otros trabajos empíricos realizados con metodologías clásicas.

  4. Ftalato de di-(2-etilexila (DEHP em bolsas de PVC para soluções parenterais de grandes volumes

    Directory of Open Access Journals (Sweden)

    M. A. Gotardo

    2009-01-01

    Full Text Available

    Soluções parenterais de grandes volumes (SPGV têm sido amplamente utilizadas como veículos para a administração de fármacos por via intravenosa e as bolsas flexíveis de policloreto de vinila (PVC são, atualmente, os recipientes plásticos mais usados no acondicionamento das SPGV, apresentando vantagens relacionadas à sua colapsação e à redução de contaminações e de embolias gasosas. Este artigo apresenta uma revisão sobre aspectos relevantes das embalagens de PVC contendo o plastificante ftalato de di-(2-etilexila (DEHP, que são usadas para acondicionamento de SPGV. São abordadas as interações entre fármacos e a embalagem, com ênfase no fenômeno da migração do DEHP presente em bolsas plásticas de PVC para SPGV contendo ciclosporina, um fármaco com atividade imunossupressora, e os aspectos toxicológicos inerentes. Palavras-chave: Soluções parenterais de grandes volumes, bolsas de PVC, DEHP, ciclosporina, migração.

  5. H Reactor

    Data.gov (United States)

    Federal Laboratory Consortium — The H Reactor was the first reactor to be built at Hanford after World War II.It became operational in October of 1949, and represented the fourth nuclear reactor on...

  6. A Bolsa de Valores de São Paulo: um estudo de suas origens, evolução e perspectivas de integração no mercado de valores globalizado

    OpenAIRE

    Monte Carmello, Milton Huppert

    1997-01-01

    Analisa e mostra a grande evolução, a partir do ano de 1964, das bolsas de valores brasileiras e estrangeiras, em especial da Bolsa de Valores de São Paulo - BOVESPA. Aprecia a questão da globalização da economia e dos mercados de títulos e valores mobiliários. Discute a integração dos mercados de valores latinoamericanos. Estuda as bolsas de valores eletrônicas, principalmente a "The Nasdaq Stock Markef', os mercados de valores mobiliários diferenciados e os fora-de-bolsa. Com...

  7. Bolsa Família (Family Grant Programme: an analysis of Brazilian income transfer programme

    Directory of Open Access Journals (Sweden)

    Luciana Mourão

    2012-06-01

    Full Text Available Income transfer programmes are common in various countries and play an important role in combating poverty. This article presents a review of the results of the Bolsa Família (Family Grant Programme, implemented in Brazil by the government of Lula da Silva in 2004. Over the last seven years many evaluations of the programme have been conducted, allowing an overview of its results and its strong and weak points to be mapped. Five central aspects relating to the programme are discussed in article five: (1 programme access, (2 hunger fighting results, (3 programme financial impacts, (4 conditioning factors of education and health, (5 supplementary programs and social mobility. The results of scientific research were presented for each of these aspects, and any of these believed to be convergent or divergent were discussed. As a general result it was concluded that the programme has generated significant results for the country, but there are still some issues that need to be reviewed, such as conditioning factors and the integrated management of the programme.

  8. ASSISTANCE SOCIAL POLICY IN BRAZIL AND BOLSA FAMÍLIA PROGRAM: CRITICAL POINTS

    Directory of Open Access Journals (Sweden)

    Haidée de Caez-Pedroso- Rodrigues

    2015-06-01

    Full Text Available This article deals with the social assistance policy in Brazil. It Is based on the critical social theory and brings as a starting point reflections on the relationship between capital accumulation and the emergence of the social question. Considering the Brazilian society and the correlation of forces between social classes, we try to present as the social rights were made in the country. Into contemporary debate, we have reviewed the main social causes, political and economic that mediated the implementation of social policies in the context of neoliberal reforms in the 1990s, when come to the fore the income transfer programs as poverty reduction strategies. When the Trabalhadores Party takes the federal government, some changes occurred mainly in the management of social welfare policy, but the liberal-conservative character of social policies remains, and in particular the actions recommended in the Bolsa Família Program. These elements point to the challenges of professionals working in the management and implementation of these social policies that are committed to the interests of the working class, both in terms of their training with regard to their professional practice.

  9. El diseño de un juego autogenerativo de títulos de bolsa

    Directory of Open Access Journals (Sweden)

    Guillermo Buenaventura Vera

    2004-01-01

    Full Text Available Contando el establecimiento de la función generadora de precios aleatorios, se desarrolla la metodología básica para la construcción de un modelo simulador de juego de bolsa que sea capaz de generar las propias variaciones de los precios de las acciones. El artículo realiza la presentación estructurada de modelo, partiendo de las bases teóricas para la elaboración de la formulación. La generación de números aleatorios distribuidos mediante la función normal estándar se construye a partir de la función uniforme generadora de números aleatorios (RAND. Las consideraciones de programación de computadores, así como una estructura básica de la misma, son tratadas enfocando tanto aplicaciones individuales del juego de simulación, como aplicaciones en red.

  10. Estudio de viabilidad para la comercialización de un producto que permita a las bolsas de plástico degradarse de una forma más rápida que en comparación con las bolsas convencionales

    OpenAIRE

    Arcila Aristizábal, Edgar Felipe.

    2012-01-01

    Este proyecto es el plan de negocios para desarrollar un aditivo que permita a las bolsas de plástico de polietileno y polipropileno degradarse de una forma más rápida en comparación con las bolsas convencionales. En este documento se presenta un estudio de mercado y la viabilidad económica y técnica de la propuesta.

  11. Reactor Physics

    Energy Technology Data Exchange (ETDEWEB)

    Ait Abderrahim, A

    2001-04-01

    The Reactor Physics and MYRRHA Department of SCK-CEN offers expertise in various areas of reactor physics, in particular in neutronics calculations, reactor dosimetry, reactor operation, reactor safety and control and non-destructive analysis of reactor fuel. This expertise is applied in the Department's own research projects in the VENUS critical facility, in the BR1 reactor and in the MYRRHA project (this project aims at designing a prototype Accelerator Driven System). Available expertise is also used in programmes external to the Department such as the reactor pressure steel vessel programme, the BR2 reactor dosimetry, and the preparation and interpretation of irradiation experiments by means of neutron and gamma calculations. The activities of the Fuzzy Logic and Intelligent Technologies in Nuclear Science programme cover several domains outside the department. Progress and achievements in these topical areas in 2000 are summarised.

  12. Reactor safeguards

    CERN Document Server

    Russell, Charles R

    1962-01-01

    Reactor Safeguards provides information for all who are interested in the subject of reactor safeguards. Much of the material is descriptive although some sections are written for the engineer or physicist directly concerned with hazards analysis or site selection problems. The book opens with an introductory chapter on radiation hazards, the construction of nuclear reactors, safety issues, and the operation of nuclear reactors. This is followed by separate chapters that discuss radioactive materials, reactor kinetics, control and safety systems, containment, safety features for water reactor

  13. Reactor operation

    CERN Document Server

    Shaw, J

    2013-01-01

    Reactor Operation covers the theoretical aspects and design information of nuclear reactors. This book is composed of nine chapters that also consider their control, calibration, and experimentation.The opening chapters present the general problems of reactor operation and the principles of reactor control and operation. The succeeding chapters deal with the instrumentation, start-up, pre-commissioning, and physical experiments of nuclear reactors. The remaining chapters are devoted to the control rod calibrations and temperature coefficient measurements in the reactor. These chapters also exp

  14. El efecto de la volatilidad del peso mexicano en los rendimientos y riesgo de la Bolsa Mexicana de Valores

    OpenAIRE

    Raúl De Jesús Gutiérrez; Edgar Ortiz

    2013-01-01

    El efecto de las colas pesadas originado por los eventos extremos y los diferentes niveles de asimetría asociados a la alta volatilidad en aglomeraciones en los mercados financieros de economías emergentes requieren de modelos más sofisticados para su modelación. El objetivo de esta investigación es aplicar la teoría de valores extremos (TVE) para cuantificar el riesgo de la cola de los rendimientos diarios de la Bolsa Mexicana de Valores bajo la agregación del riesgo del tipo de cambio duran...

  15. Adopción de las IFRS por parte de las entidades que cotizan en la Bolsa Mexicana de Valores

    OpenAIRE

    Aguilera Aguilera, José Rafael; Alcaraz Vera, Jorge Víctor

    2014-01-01

    Se aborda el impacto que puede tener en el mejoramiento de la información financiera de las empresas públicas mexicanas el cambio de normatividad contable. Es decir, se describe cómo podría ser el comportamiento de la relevancia de la información financiera de las empresas que cotizan en la Bolsa Mexicana de Valores (BMV), al emigrar de normas contables mexicanas, llamadas Normas de Información Financiera (NIF’s) a las Normas Internacionales de Información Financiera (NIIF) Fil: Aguilera A...

  16. IMPACTO DE LA MUJER DIRECTIVA EN LA SALIDA A BOLSA DE EMPRESAS DE ALTA TECNOLOGIA: EL EFECTO MEDIADOR DE LAS PATENTES Y EL DESARROLLO DE PRODUCTOS

    Directory of Open Access Journals (Sweden)

    Quintana Garcia, Cristina

    2016-05-01

    Full Text Available Este trabajo examina la relacion entre la presencia de la mujer en los equipos de alta direcciony el exito de las empresas de alta tecnologia en su salida a bolsa. Asimismo, analiza como indicadores especificos de capacidad de innovacion pueden mediar dicha relacion La investigacion empirica de una muestra de empresas biotecnologicas que salieron a bolsa en el mercado de valores estadounidense indica un efecto negativo y significativo de la proporcion de mujeres en la direccion ejecutiva, aunque confirma la influencia positiva de los indicadores de innovacion que ademas median y hacen no significativo el efecto de la diversidad de genero.

  17. Optimización financiera de portafolios de inversión en la Bolsa de Valores de Colombia mediante el uso de RGOP

    OpenAIRE

    2016-01-01

    La Bolsa de Valores de Colombia (BVC) ha tenido un impacto reducido en la población colombiana sobre todo debido a la falta de educación financiera y a múltiples casos de corrupción que han opacado su rol en la sociedad -- En general, los colombianos ven con incertidumbre, desconfianza y escepticismo las ventajas de invertir en la bolsa tales como obtener rendimientos superiores que las de las inversiones tradicionales, seguridad en las transacciones y disponibilidad del dinero cuando se requ...

  18. Reactor Neutrinos

    OpenAIRE

    Soo-Bong Kim; Thierry Lasserre; Yifang Wang

    2013-01-01

    We review the status and the results of reactor neutrino experiments. Short-baseline experiments have provided the measurement of the reactor neutrino spectrum, and their interest has been recently revived by the discovery of the reactor antineutrino anomaly, a discrepancy between the reactor neutrino flux state of the art prediction and the measurements at baselines shorter than one kilometer. Middle and long-baseline oscillation experiments at Daya Bay, Double Chooz, and RENO provided very ...

  19. [Poverty and social policy: the implementation of complementary programs for the Bolsa Família Program].

    Science.gov (United States)

    Santos, Cláudia Roberta Bocca; Magalhães, Rosana

    2012-05-01

    The Bolsa Família Program involves the transfer of income and the implementation of complementary programs to foster human capital development and empower the beneficiaries. To analyze the implementation of complementary programs in Manguinhos, Rio de Janeiro, a review of documents and secondary data was conducted, focus groups of beneficiaries studied and semi-structured interviews were staged with governmental, nongovernmental stakeholders and beneficiaries. The design, coverage and evaluation of the complementary programs have been weak, and beneficiaries were even unaware of vocational training courses. The program administrators acknowledged the failings and the fact that the courses offered by Próximo Passo are not adapted to local demand, even though they were conceived as a vocational training strategy aimed at creating construction jobs in the Growth Acceleration Program and the tourist industry in the city. Considering that the social inclusion perspective is linked to access to public policies, the supply and follow-up of these activities by government agencies and civil society organizations are essential for the effectiveness of the fight against poverty and hunger, aimed at contributing to the so-called "exit routes" from the Bolsa Família Program.

  20. Programas sociais no Brasil: um estudo sobre o programa bolsa família no interior do nordeste brasileiro

    Directory of Open Access Journals (Sweden)

    Clóvis Roberto Zimmermann

    Full Text Available O Programa Bolsa Família continua sendo motivo de divergências no Brasil, seja por suas premissas, seja no que tange à diminuição da pobreza, o valor do benefício, a exigência das condicionalidades, os erros de inclusão, o beneficiamento político, as “portas de saída”, dentre outros. Em virtude disso, o presente artigo se propõe a estudar o Bolsa Família em nível local, pautado na percepção dos beneficiários. Ao final, são discutidos os resultados da pesquisa, indicando a necessidade de maior investimento na qualidade da educação e da saúde pública brasileira. O estudo também sugere que talvez seja o momento de repensar as condicionalidades. Ao invés de controlar os beneficiários, os governos deveriam melhorar a qualidade da saúde e da educação, bem como articular programas complementares, especialmente os de acesso ao trabalho.

  1. Qualidade de grãos de milho armazenados em silos bolsa Quality of corn grain stored in silo bags

    Directory of Open Access Journals (Sweden)

    André Rodrigues da Costa

    2010-06-01

    Full Text Available A utilização de bolsas seladas hermeticamente é uma alternativa aos métodos tradicionais de armazenagem de grãos em nível de fazenda. Em vista disso, objetivou-se com este trabalho avaliar a qualidade de milho armazenado hermeticamente em silos bolsa. O produto, com teores de água de 14,5 e 18,0% b.u, foi acondicionado em mini-bolsas devidamente seladas nas temperaturas de 25; 30 e 35 ºC. Foram realizadas análises de teor de água, de classificação dos grãos, de massa específica aparente, de percentual de germinação e de condutividade elétrica, no início do armazenamento e após 30; 60; 90; 135 e 180 dias. Verificou-se que não houve variação do teor de água dos grãos de milho armazenados nos silos bolsa. Os grãos de milho foram classificados como Tipo 1 ao longo do período de armazenamento, exceto para os com 18,0% (b.u. de teor de água na temperatura de 35 ºC. Não houve decréscimo significativo da massa especifica aparente do produto ao longo do armazenamento. Em geral, ocorreu decréscimo do percentual de germinação dos grãos de milho armazenados úmidos e secos e acréscimo da condutividade elétrica da solução que continha os grãos, exceto para os armazenados com 14,5% nas temperaturas de 25 e 30 ºC. Conclui-se que é possível armazenar milho em silos bolsa, durante 180 dias, grãos com teor de água de 14,5% (b.u. nas temperaturas de 25; 30 e 35 ºC e grãos com teor de água de 18,0% por 180 dias nas temperaturas de 25 e 30 ºC.Airtight storage in sealed bags provides an alternative to traditional methods for on-farm grain storage. The objective of this work was therefore to evaluate the quality of corn stored in airtight sealed bags. Grain with moisture content (m.c. of about 14.5 and 18.0% (w.b. was properly stored in sealed mini-bags at 25; 30; and 35 ºC. Analyses included moisture content, grain classification, apparent specific mass, percentage of germination and electrical conductivity at the

  2. Programa Bolsa-Familia: qualidade da dieta de populacao adulta do municipio de Curitiba, PR

    Directory of Open Access Journals (Sweden)

    Flavia Emilia Leite de Lima

    2013-03-01

    Full Text Available Este estudo avaliou a qualidade da dieta da população beneficiária do Programa Bolsa-Família, em Curitiba, PR. Estudo transversal, de base populacional, realizado no período de julho de 2006 a julho de 2007. Foram entrevistados 747 beneficiários, a partir dos 19 anos de idade, de ambos os sexos. Para avaliação da qualidade da dieta foi aplicado recordatório de 24 horas, e o Índice de Qualidade da Dieta (IQD foi utilizado como parâmetro para classificação do grupo em níveis de consumo. Estatística descritiva foi utilizada para descrever a qualidade da dieta da população. Para a comparação de médias do índice segundo as variáveis socioeconômicas foram realizados o teste t de Wald e a análise de variância ANOVA, considerando-se um nível de significância de 5%. A amostra foi constituída por 91,4% de mulheres e 8,6 % de homens. A média de idade da população foi de 36,4 ± 13,3 anos, com cerca de 75 % possuindo o ensino fundamental incompleto. A média do IQD foi de 51 pontos, o que caracteriza uma dieta que precisa de ajustes. A população possui uma dieta monótona, com um consumo adequado de leguminosas, porém baixo para frutas, verduras e produtos lácteos. Na comparação entre as categorias de qualidade da dieta dos indivíduos, todos os componentes, com exceção do sódio, apresentaram medianas de pontuação estatisticamente diferentes (p < 0,01. Estudos que avaliem a qualidade da dieta são fundamentais para subsidiar a implantação de programas de educação alimentar direcionados para o cerne do problema nas populações estudadas.

  3. PANORAMA DOS PROGRAMAS DE BOLSAS DE EXTENSÃO EXISTENTES NAS INSTITUIÇÕES DE ENSINO SUPERIOR PÚBLICAS BRASILEIRAS

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    Ana Inês Souza

    2003-12-01

    Full Text Available O presente trabalho teve como objetivos traçar um panorama dos programas de bolsas de extensão existentes nas Instituições de Ensino Superior (IES Públicas Brasileiras, no ano de 2001, e identificar como as Universidades Públicas estão financiando suas atividades de extensão.

  4. FENESTRAÇÃO VIDEOENDOSCÓPICA DO SEPTO MEDIAL DA BOLSA GUTURAL E RETIRADA DE CONDRÓIDES EM UM EQUINO – RELATO DE CASO

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    Carla Faria Orlandini

    2014-07-01

    Full Text Available As bolsas guturais são divertículos da tuba auditiva, divididas em compartimentos lateral e medial, possuindo função termorregulatória. Suas mais frequentes afecções são empiema, micose e timpanismo. O empiema é o que ocorre com maior frequência, tendo como principal agente causador o Streptococcus equi. Animais acometidos apresentam secreção nasal e quando crônico, há espessamento deste material, resultando em concreções duras, os condróides. O objetivo deste trabalho é relatar a utilização do acesso cirúrgico através do triângulo de Viborg, fenestração videoendoscópica do septo mediano e retirada de condróides da bolsa gutural. Relata-se o caso de um equino que apresentava secreção nasal, apatia e anorexia. Através de endoscopia observou-se secreção purulenta principalmente na bolsa direita, caracterizando empiema. Realizou-se coleta deste material para realização de exame microbiológico. Foi instituído o tratamento clínico, porém sem resultados satisfatórios. Realizou-se, sob anestesia geral, a fenestração do septo mediano e acesso à bolsa pelo triângulo de Viborg no lado esquerdo, com implantação de sonda de Foley até a entrada da bolsa direita. Sem sucesso no tratamento pós-cirúrgico foi realizada nova endoscopia onde verificou-se a presença de condróides os quais foram retirados por novo procedimento cirúrgico, desta vez pelo lado direito. Conclui-se com este relato que a técnica de acesso à bolsa gutural pelo triângulo de Viborg mostra-se muito eficaz na remoção de condróides, que a fenestração do septo potencializa a limpeza diária das bolsas e que o exame endoscópico é a principal forma de diagnóstico do empiema, podendo este ser causado por Pseudomonas aeruginosa.

  5. Vacunación asistida por serología para la enfermedad infecciosa de la bolsa

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    Carmen L. Perera; Julia Noda; Sandra Cuello;, P. Alfonso;

    2005-05-01

    Full Text Available El control efectivo contra enfermedad Infecciosa de la bolsa se basa en las medidas de bioseguridad y en la aplicación de un programa de vacunación efectivo, donde la selección adecuada del momento óptimo de aplicación de la primera dosis de vacuna está determinado por los niveles de anticuerpos maternos (vacunación asistida.En este trabajo se estudió la declinación de los anticuerpos maternos en el tiempo en 40 pollitos de la raza Leghorn desde un día hasta los 31 días por sueroneutralización y se elaboró una ecuación para predecir el momento adecuado de vacunación. También se estudiaron pollitos de un día de edad pertenecientes a dos granjas diferentes, en las cuales se aplicó la primera dosis de vacuna cuando los títulos de anticuerpos maternos oscilaba entre 1:80 y 1:100.La vacunación consistió en dos dosis con un intervalo de diez días. Antes de la aplicación de cada vacuna, así como a los 21 días postvacunación con la última dosis se determinó la presencia de anticuerpos contra la enfermedad infecciosas de la bolsa por sueroneutralización. Todos los pollos fueron confrontados a este mismo tiempo con un aislamiento de campo.Se obtuvo en todos los casos una respuesta adecuada a la vacunación, con elevados títulos neutralizantes a los 21 días de edad y en ninguno de los pollos confrontados se observó ni sintomatología clínica, ni alteraciones histopatológicas en la bolsa de Fabricio, lo que indica que la vacunación fue aplicada en el momento óptimo. Por lo que los

  6. Pobreza e Política Social: a implementação de programas complementares do Programa Bolsa Família Poverty and Social Policy: the implementation of complementary programs for the Bolsa Família Program

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    Cláudia Roberta Bocca Santos

    2012-05-01

    Full Text Available O Programa Bolsa Família articula a transferência de renda à implementação de programas complementares, a fim de promover o desenvolvimento de capital humano e a autonomização dos beneficiários. Para analisar a implementação dos programas complementares em Manguinhos, Rio de Janeiro, realizamos consultas documentais; grupos focais com beneficiários; entrevistas semiestruturadas com atores governamentais, não-governamentais e beneficiários, além da coleta de dados secundários. O desenho, a cobertura e a avaliação dos programas complementares mostraram-se frágeis. Os beneficiários desconheciam cursos de qualificação profissional. Os gestores reconheceram a debilidade das ações e destacaram que os cursos do Próximo Passo não se adéquam à demanda local, ainda que pensados como estratégia de capacitação voltada às obras do Programa de Aceleração do Crescimento e à vocação turística da cidade do Rio de Janeiro. Considerando que a perspectiva de inclusão social está atrelada ao acesso às políticas públicas, a oferta e o acompanhamento destas ações pelas esferas governamentais e organizações civis constituem um eixo crucial para o combate à pobreza e à fome, contribuindo para as chamadas "portas de saída" do Programa Bolsa Família.The Bolsa Família Program involves the transfer of income and the implementation of complementary programs to foster human capital development and empower the beneficiaries. To analyze the implementation of complementary programs in Manguinhos, Rio de Janeiro, a review of documents and secondary data was conducted, focus groups of beneficiaries studied and semi-structured interviews were staged with governmental, nongovernmental stakeholders and beneficiaries. The design, coverage and evaluation of the complementary programs have been weak, and beneficiaries were even unaware of vocational training courses. The program administrators acknowledged the failings and the fact that

  7. O Impacto das Regras do Programa Bolsa Família Sobre a Fecundidade das Beneficiárias

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    Luis Antonio Winck Cechin

    2015-09-01

    Full Text Available Este trabalho investiga um possível incentivo do Programa Bolsa Família ao aumento da fecundidade de suas beneficiárias em decorrência de suas regras, dado que a quantidade de recursos transferidos depende do número de filhos da família. O diferencial deste estudo reside na análise desse impacto em um maior período de exposição das beneficiárias aos efeitos do PBF. Aplica-se o algoritmo de seleção de covariadas proposto por Imbens (2014 e o método de Propensity Score Matching. Os resultados apontaram que o PBF gera pequeno incentivo à geração do segundo filho, sendo que as regiões Centro-Oeste e Nordeste apresentaram os maiores valores de impacto.

  8. Programas de transferência de renda no Brasil: um estudo multidimensional da implementação do Bolsa Escola, Bolsa Alimentação e Cartão Alimentação Cash transfer programs in Brazil: a multidimensional study of Bolsa Escola, Bolsa Alimentação and Cartão Alimentação Program implementation

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    Leonor Maria Pacheco Santos

    2011-03-01

    Full Text Available Foi analisada a implementação dos programas de transferência de renda (PTR Bolsa Escola (PNBE, Bolsa Alimentação (PBA e Cartão Alimentação (PCA, coletando-se informações sobre "estrutura" normativa, infraestrutura, "processos" de implementação e "resultados" relativos a benefícios concedidos e impactos. A argumentação central do trabalho considerou que a adoção de PTR no Brasil representou um diferencial com relação às formas de intervenção antes adotadas especialmente no campo da promoção do direito humano à alimentação adequada. Verificou-se que lacunas na "estrutura" normativa podem dificultar a implantação; assim ocorreu com a opção centralizadora no PNBE, a indefinição de atribuições estaduais no PBA e a ausência de normatização clara no PCA. Ocorreram restrições no processo de implementação, resultando numa sinergia de fatores impeditivos ao acesso de parcelas dos mais excluídos. Exigências de documentos civis, comprovante de residência e cobrança de notas fiscais de compra de alimentos foram mecanismos de reforço a desigualdades existentes. Assim, este estudo evidencia que o desafio está posto na direção de articular os PTR com os demais programas que promovem acesso aos direitos sociais, avançando na intersetorialidade como forma de garantir aos mais excluídos o ingresso ao mundo dos direitos.The implementation of cash transfer (CT programs Bolsa Escola (PNBE, Bolsa Alimentação (PBA and Cartão Alimentação (PCA was analyzed, collecting data about the legislative "structure" and infrastructure, the implementation "process" and the "results", as far as benefits granted and impacts. This study considers that the adoption of CT policies in Brazil implies in an improvement when compared to previous interventions, especially as regard the promotion of human right to adequate food. It was observed that inadequate legislation can hinder program implementation; so it happened with the

  9. O Programa Bolsa Família: uma breve análise à luz da teoria dos direitos fundamentais

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    Whenry Hawlysson Araújo Silveira

    2016-11-01

    Full Text Available A caracterização da pobreza e da extrema pobreza não deve estar relacionada apenas a carência econômica. Vincula-se a um feixe de direitos mínimos que devem ser garantidos em respeito à dignidade da pessoa humana. O mínimo existencial deve ser sempre garantido. A Constituição Brasileira elenca dentre os objetivos fundamentais da República a erradicação da pobreza. O Programa Bolsa Família surge como a principal política pública que persegue esse objetivo. São apresentados dados que mostram o resultado parcial do programa, especialmente em termos de renda, educação e saúde para garantia do mínimo existencial das camadas mais pobres.

  10. A CRISE DA BOLSA DE VALORES CHINESA: UMA ANÁLISE DOS EFEITOS SOBRE MERCADOS ACIONÁRIOS INTERNACIONAIS

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    Antônio André Cunha Callado

    2014-04-01

    Full Text Available Estudos de eventos têm sido amplamente utilizados para investigar a Hipótese dos Mercados Eficientes tem sido amplamente investigada ao longo das últimas duas décadas. O artigo tem como objetivo investigar a reação de índices de diversos mercados acionários ao evento na Bolsa de Valores da China em fevereiro de 2007. Para a realização do estudo foram utilizados 12 índices pertencentes a diversos mercados acionários (Alemanha, Argentina, Austrália, Brasil, Estados Unidos, França, Hong Kong, Índia, Indonésia, Inglaterra, Japão e México. Os procedimentos referentes ao delineamento do estudo consideraram a definição da janela de tempo, bem como os procedimentos inerentes a um estudo de evento para realçar alterações no comportamento dos retornos dos índices de mercado e investigar a ocorrência de retornos anormais acumulados. Os resultados obtidos demonstram evidências inerentes à reação de alguns dos mercados acionários investigados em relação ao evento ocorrido na Bolsa chinesa. A queda dos Índices de Performance de Sharpe observada em todos os índices de mercado investigados revelam evidências que corroboram o impacto significativo e sistemático decorrente da queda ocorrida no mercado acionário chinês. Este resultado sugere que a importância relativa da China no cenário internacional dos mercados de capitais não deve ser subestimada.

  11. Multifunctional reactors

    NARCIS (Netherlands)

    Westerterp, K.R.

    1992-01-01

    Multifunctional reactors are single pieces of equipment in which, besides the reaction, other functions are carried out simultaneously. The other functions can be a heat, mass or momentum transfer operation and even another reaction. Multifunctional reactors are not new, but they have received much

  12. Investigação do transplante heterólogo de quelóide na bolsa jugal do hamster (Mesocricetus auratus

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    Hochman Bernardo

    2003-01-01

    Full Text Available OBJETIVO: Descrever a integração do transplante heterólogo de quelóide no subepitélio da bolsa jugal do hamster (Mesocricetus auratus. MÉTODOS: A amostragem consiste de 18 hamsters machos, não isogênicos, com 10 a 14 semanas de idade. Fragmentos de quelóide foram obtidos de cicatrizes queloideanas da região mamária de paciente adulta parda. Cada hamster foi enxertado em ambas as bolsas com fragmentos de quelóide, totalizando 36 fragmentos enxertados. Os animais foram distribuídos, em 6 grupos, para exame dos fragmentos enxertados com 5, 12, 21, 42, 84 e 168 dias. Uma avaliação macroscópica é realizada comparando a bolsa contendo o fragmento enxertado em cada período com a mesma bolsa no pós-operatório imediato, mediante a comparação de fotografias padronizadas. À microscopia, considera-se a presença de vasos sangüíneos no tecido conjuntivo do fragmento enxertado como critério de integração do mesmo. Outros eventos, como secreção de queratina, presença de infiltrados celulares e aspecto do epitélio e das fibras colágenas do quelóide, também são observados. RESULTADOS: A macroscopia revela intensa vascularização na bolsa até 12 dias de enxertia, e a presença constante de pigmentação castanho-escura nos fragmentos de quelóide enxertados. Na microscopia constata-se a integração dos fragmentos de quelóide pela presença de capilares sangüíneos no tecido conjuntivo. Observa-se, também, a presença de intenso infiltrado celular do tipo inflamatório até 12 dias, a permanência do epitélio do quelóide até 21 dias, e o aparecimento de melanócitos a partir de 42 dias. CONCLUSÃO: A bolsa jugal do hamster representa, a priori, modelo experimental para investigação do quelóide.

  13. Reactor vessel

    OpenAIRE

    Makkee, M.; Kapteijn, F.; Moulijn, J.A

    1999-01-01

    A reactor vessel (1) comprises a reactor body (2) through which channels (3) are provided whose surface comprises longitudinal inwardly directed parts (4) and is provided with a catalyst (6), as well as buffer bodies (8, 12) connected to the channels (3) on both sides of the reactor body (2) and comprising connections for supplying (9, 10, 11) and discharging (13, 14, 15) via the channels (3) gases and/or liquids entering into a reaction with each other and substances formed upon this reactio...

  14. Intersetorialidade, convergência e sustentabilidade: desafios do programa Bolsa Família em Manguinhos, RJ Intersectoral, convergent and sustainable actions: the challenges of the "Bolsa Família" program in Manguinhos shantytown in Rio de Janeiro

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    Rosana Magalhães

    2011-11-01

    Full Text Available Alguns estudos têm revelado o impacto de programas de transferência condicionada de renda na melhoria das condições de vida e no acesso a serviços básicos de saúde e educação em diferentes países. No entanto, persistem lacunas no que se refere à avaliação dos benefícios de tais intervenções entre os grupos que apresentam maiores dificuldades em acessar serviços públicos ou dos avanços na qualidade do ensino e desempenho escolar. Além disso, existem poucas evidências sobre a adequação das ações aos respectivos contextos de implementação, níveis de adesão e cooperação, local e estratégias adotadas para a integração com as demais políticas de proteção social. O artigo discute os resultados da pesquisa avaliativa sobre a implementação do programa de transferência condicionada de renda Bolsa Família em Manguinhos (RJ realizada entre os anos de 2007 e 2008. Foram realizadas entrevistas com gestores das secretarias municipais de assistência social, saúde e educação e agentes implementadores locais. Em Manguinhos, a sustentabilidade das ações voltadas à redução da pobreza e promoção da saúde envolve o fortalecimento de canais de interlocução entre níveis de governo, gestores públicos e associações civis, reconhecimento da complexidade das demandas sociais locais e pactuação de uma agenda intersetorial.Some studies have revealed the impact of the family welfare allowance based on the fulfillment of certain conditions on improving living conditions and access to health and education services in different countries. However, gaps persist relating to the evaluation of the benefits of such programs among the groups that have greater difficulty in gaining access to public services or advances in the quality of education and school performance. Moreover, there is limited evidence of adequacy of the program to the respective contexts of implementation, levels of adhesion and local cooperation and

  15. Discutindo o papel do Programa Bolsa Família na decisão das eleições presidenciais brasileiras de 2006

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    Rosa Maria Marques

    2009-03-01

    Full Text Available This paper investigates the relationship between the impact of Bolsa Família Program in the Brazilian population and the result of the presidential elections of 2006. The database involves municipal information provided by MDS, IBGE and TSE. To control the experiment, the eventual influences of other variables in the determination of this relationship had been studied. All those variables come from specific characteristics of the cities, such as: city with predominant urban or not urban population; size of the city population; among others. The results state that the Bolsa Família was, in fact, a very important factor in the determination of the votes in Lula. It was, in itself, responsible by 45% of the total votes in Lula.

  16. Society-State relationships, citizen participation and political clientelism inside programs that combat poverty. The case of «Bolsa Familia» in Brazil

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    Felipe J. HEVIA

    2011-06-01

    Full Text Available Relations between poor people and the government that creates the Programa Bolsa Familia at Brazil may be summarized in two dimensions: 1 favor direct relationships without the intervention of collective action and 2 are distant relations in terms of type of interaction and communication between the authorities and beneficiaries. While there are instances of formal social control, operation of the program makes minimal intermediation and highly institutional and civic organizations have little room to act and to represent the beneficiaries of Bolsa Familia in institutionalized interfaces. Direct links generate positive effect low levels of political patronage vote buying and coercion, but also generate unintended effects such as the lack of program operation, difficulty to defend themselves collectively by irregularities and create an active citizenry.

  17. Mujer directiva y salida a bolsa de empresas de alta tecnología: un estudio del mercado de valores estadounidense

    OpenAIRE

    Quintana García, Cristina; Marchante Lara, Macarena; Carlos A. Benavides Velasco

    2015-01-01

    Este trabajo examina la relación entre la presencia de la mujer en los equipos de alta dirección y el éxito de las empresas de alta tecnología en su salida a bolsa. Asimismo, analiza cómo indicadores específicos de capacidad de innovación pueden mediar dicha relación. Una investigación empírica de una muestra de empresas biotecnológicas que salieron a bolsa en el mercado de valores estadounidense, indica un efecto negativo y significativo de la proporción de mujeres en la dirección ejecutiva,...

  18. Programa Bolsa Família: uma análise do programa de transferência de renda brasileiro Bolsa Família (Family Grant Programme: an analysis of Brazilian income transfer programme Le programme Bolsa Família (Bourse familiale : analyse du programme brésilien de transfert conditionnel de revenus El programa Bolsa Família: un análisis del programa brasileño de transferencia de ingresos

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    Luciana Mourão

    2012-02-01

    Full Text Available Income transfer programmes are common in various countries and play an important role in combating poverty. This article presents a review of the results of the Bolsa Família (Family Grant Programme, implemented in Brazil by the government of Lula da Silva in 2004. Over the last seven years many evaluations of the programme have been conducted, allowing an overview of its results and its strong and weak points to be mapped. Five central aspects relating to the programme are discussed in article five: (1 programme access, (2 hunger fighting results, (3 programme financial impacts, (4 conditioning factors of education and health, (5 supplementary programs and social mobility. The results of scientific research were presented for each of these aspects, and any of these believed to be convergent or divergent were discussed. As a general result it was concluded that the programme has generated significant results for the country, but there are still some issues that need to be reviewed, such as conditioning factors and the integrated management of the programme.Les programmes de transfert de revenus sont courants dans plusieurs pays et jouent un rôle important dans la lutte contre la pauvreté. Cet article présente un examen des résultats du programme Bolsa Família (Bourse familiale entrepris au Brésil par le gouvernement de Lula da Silva en 2004. Au cours des sept dernières années, de nombreuses évaluations du programme ont été réalisées, ce qui permet d'avoir un aperçu de ses résultats et une vue d'ensemble de ses points forts et de ses points faibles. Cinq aspects clés de ce programme sont abordés dans cet article : (1 l'accès au programme, (2 les résultats en matière de lutte contre la faim, (3 les répercussions financières du programme, (4 les facteurs conditionnels de l'éducation et de la santé, (5 les programmes complémentaires et la mobilité sociale. Des résultats issus de la recherche scientifique ont été pr

  19. NUCLEAR REACTOR

    Science.gov (United States)

    Miller, H.I.; Smith, R.C.

    1958-01-21

    This patent relates to nuclear reactors of the type which use a liquid fuel, such as a solution of uranyl sulfate in ordinary water which acts as the moderator. The reactor is comprised of a spherical vessel having a diameter of about 12 inches substantially surrounded by a reflector of beryllium oxide. Conventionnl control rods and safety rods are operated in slots in the reflector outside the vessel to control the operation of the reactor. An additional means for increasing the safety factor of the reactor by raising the ratio of delayed neutrons to prompt neutrons, is provided and consists of a soluble sulfate salt of beryllium dissolved in the liquid fuel in the proper proportion to obtain the result desired.

  20. Reactor Neutrinos

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    Soo-Bong Kim

    2013-01-01

    Full Text Available We review the status and the results of reactor neutrino experiments. Short-baseline experiments have provided the measurement of the reactor neutrino spectrum, and their interest has been recently revived by the discovery of the reactor antineutrino anomaly, a discrepancy between the reactor neutrino flux state of the art prediction and the measurements at baselines shorter than one kilometer. Middle and long-baseline oscillation experiments at Daya Bay, Double Chooz, and RENO provided very recently the most precise determination of the neutrino mixing angle θ13. This paper provides an overview of the upcoming experiments and of the projects under development, including the determination of the neutrino mass hierarchy and the possible use of neutrinos for society, for nonproliferation of nuclear materials, and geophysics.

  1. Chemical Reactors.

    Science.gov (United States)

    Kenney, C. N.

    1980-01-01

    Describes a course, including content, reading list, and presentation on chemical reactors at Cambridge University, England. A brief comparison of chemical engineering education between the United States and England is also given. (JN)

  2. Reactor Neutrinos

    OpenAIRE

    Lasserre, T.; Sobel, H.W.

    2005-01-01

    We review the status and the results of reactor neutrino experiments, that toe the cutting edge of neutrino research. Short baseline experiments have provided the measurement of the reactor neutrino spectrum, and are still searching for important phenomena such as the neutrino magnetic moment. They could open the door to the measurement of coherent neutrino scattering in a near future. Middle and long baseline oscillation experiments at Chooz and KamLAND have played a relevant role in neutrin...

  3. Mulher e família no Programa Bolsa-Escola: maternidades veiculadas e instituídas pelos anúncios televisivos Woman and family at the Bolsa-Escola Program: maternities propagated and instituted through TV advertisements

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    Carin Klein

    2007-12-01

    Full Text Available Este artigo problematiza alguns processos de produção e veiculação de representações de maternidade, tomando como referência o Programa Nacional Bolsa-Escola, e insere-se no campo da teorização cultural, principalmente na perspectiva dos Estudos Culturais e dos Estudos Feministas, nas vertentes que têm proposto uma aproximação crítica com a análise pós-estruturalista. Para a operacionalização do trabalho, selecionei um conjunto de anúncios televisivos que divulgaram o Programa à população no primeiro ano de sua implantação. Exploro os anúncios com o intuito de analisar os diferentes modos de representar e significar a maternidade. Discuto como se organiza e divulga, no âmbito do Programa, um conjunto de ensinamentos e propostas a serem desenvolvidas, principalmente na família, a fim de buscar (recolocar, sobretudo, as mulheres-mães e a educação das crianças no centro desses debates.This work discusses and questions some processes of production and propagation of maternity representations, having the National Bolsa-Escola Program as its starting point, and localized in the field of cultural theory, mainly from the perspectives of both Cultural Studies and Feminist Studies, with a critical approximation to the post-structuralist analysis. In order to carry out the work, I have selected a series of television advertisements used to publicize the Program in its first year of implementation. I have explored these advertisements in order to analyze the different ways through which maternity has been represented and meant. I have discussed how a set of teachings and proposals was publicized in the Program so as to be mainly developed by the families, thus relocating women/mothers and children’s education into the center of those debates.

  4. Avaliação de Impacto das condicionalidades de educação do Programa Bolsa Família (2005 e 2009

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    Ernesto Friedrich de Lima Amaral

    2013-09-01

    Full Text Available Dans cet article, on examine les impacts des conditionnalités de l'éducation dans le Programme Bolsa Família sur l'absentéisme scolaire d'enfants qui bénéficient de ce programme. L'hypothèse principale est que l'enfant qui habite dans un foyer recevant cette aide a moins de chances d'abandonner l'école. On se sert de données de l'Étude de l'impact du Programme Bolsa Família (AIBF de 2005 à 2009 du Ministère du Développement Social et de la Lutte contre la Faim (MDS. Des modèles logistiques ont estimé les chances d'abandon scolaire de 2005 à 2009, à partir de trois niveaux de revenu domiciliaire par habitant, compte tenu des caractéristiques du foyer, de la mère et de l'enfant. Les enfants habitant dans des foyers bénéficiaires du Programme Bolsa Família ont révélé une nette réduction du taux d'abandon scolaire en 2005. Les données pour 2009 n'ont pas été statistiquement significatives, bien que montrant une diminution de l'abandon scolaire comme résultat de l'aide reçue du Bolsa Família.

  5. Uma análise do efeito do programa bolsa família sobre o desempenho médio das escolas brasileiras

    Directory of Open Access Journals (Sweden)

    Pedro Cavalcanti Camargo

    2014-12-01

    Full Text Available O objetivo deste artigo é avaliar o efeito de um aumento na proporção de alunos beneficiados pelo Programa Bolsa Família nas escolas sobre o desempenho médio das mesmas. Utilizando dados do Censo Escolar de 2008, da pesquisa de Acompanhamento da Freqüência Escolar dos beneficiários do Programa Bolsa Família de 2008 e da Prova Brasil 2009, este artigo procura relacionar o desempenho médio por escola dos alunos de 4ª série observado em 2009 com a proporção de alunos participantes do programa Bolsa Família em 2008. Os resultados encontrados sugerem que um aumento na proporção de alunos beneficiados reduz, em média, a taxa de abandono. Entretanto, as evidências para a taxa de aprovação e exames de proficiência não foram estatisticamente robustas.

  6. Impact of the Bolsa Família Program on energy, macronutrient, and micronutrient intakes: Study of the Northeast and Southeast

    Directory of Open Access Journals (Sweden)

    Naiara SPERANDIO

    Full Text Available ABSTRACT Objective: To assess the impact of the Bolsa Família Program on the energy and nutrient intakes of beneficiaries from the Brazilian Northeast and Southeast regions. Methods: The study used data from the 2008-2009 Pesquisa de Orçamento Famíliar, which assessed individual food intake on two nonconsecutive days of individuals aged more than 10 years. Based the personal information booklet, food intake values were transformed into nutritional values (energy and nutrients. Analysis of the impact measure was preceded by propensity score matching, a technique that matches some socioeconomic characteristics of beneficiaries and nonbeneficiaries. Once the score was calculated, the impact of the Bolsa Família Program was estimated by nearest neighbor matching. Results: The program increased energy and macronutrient intakes and decreased calcium and vitamin A, D, E, and C intakes of adolescent beneficiaries in both regions. Adult beneficiaries from the Southeast region increased their fiber, iron, and selenium intakes, and those from the Northeast region decreased their energy, lipid, added sugar, sodium, zinc, vitamin E, and pyridoxine intakes. Conclusion: The results show a positive impact of the program on the energy and macronutrient intakes, and a negative impact on the intakes of most study micronutrients, especially in adolescents, which reinforce the importance of implementing intersectoral actions to improve the nutritional quality of the Bolsa Família Program beneficiaries' diet.

  7. Ensayos físico químicos para el estudio de la degradación de bolsas de supermercado

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    Luis Latrónica

    2011-05-01

    Full Text Available Este trabajo describe y analiza la variación de algunas propiedades físicas y químicas que las bolsas de supermercado (polietileno experimentan durante su degradación. Se estudian estas propiedades para las “bolsas camiseta” que contienen y para las que no contienen aditivos para acelerar su degradación. Las muestras se colocan en un equipo de simulación de radiación solar con temperatura y humedad controladas en equipo Weather-o-meter. Durante la exposición a las diferentes condiciones ambientales se extrajeron muestras con una frecuencia de 50 horas y se realizaron ensayos de tracción, elongación, desgarro y de espectroscopía infrarroja (FTIR. Los valores indican que las bolsas quecontienen aditivo oxi-biodegradable muestran pérdidas apreciables de sus propiedades físicas y químicas en la mitad del tiempoque aquellas que no contienen el aditivo.

  8. Bolsa família: projeto social ou marketing político? Family grant: social policy or political marketing?

    Directory of Open Access Journals (Sweden)

    Paulo Gabriel Martins de Moura

    2007-06-01

    Full Text Available Esse ensaio, à luz da análise política, critica o Programa Bolsa Família, implementado pelo governo Lula, a partir da metodologia de ongoing analysis conjuntural, originada na ciência política norte-americana. Busca estabelecer paralelo dessas análises com as críticas de especialistas ao Bolsa Família, veiculadas na imprensa, que sugerem a ausência de um referencial conceitual, amparado no conhecimento acumulado na área (ou sua não-aplicação prática, a nortear as políticas sociais do governo Lula. Baseando-se em fontes secundárias sobre dados oficiais e em depoimentos de especialistas, a análise identifica uma aparente 'esquizofrenia' nos referenciais 'filosóficos' que norteiam as políticas sociais do governo, sugerindo que a solução escolhida foi uma resposta conjuntural a uma demanda de marketing governamental, e não orientada por uma deliberada política pública de governo pré-concebida como tal que, se existiu, não transparece nas ações governamentais aplicadas.This essay, a political analysis, criticizes the Family Grant Program, implemented by the Lula government of 2003-2005. It is based on the ongoing analysis methodology originated in U.S. political science. It seeks to establish a parallel of these analyses with criticisms of the Family Grant program presented in the media and made by specialists. They focus on the absence of a conceptual reference for the program (or its practical non-application, supported by accumulated knowledge in the field, that would guide the social policies of the Lula government. Based on secondary sources about official data and on statements from specialists, the analysis identifies an apparent 'schizophrenia' in the 'philosophical' references that orient the government's social policies, suggesting that the solution chosen was a situational response to a demand for government marketing and not oriented to a deliberate public policy pre-conceived as such, which, if it exists, is

  9. O Programa Bolsa Família: lições da experiência alemã

    Directory of Open Access Journals (Sweden)

    Clóvis Roberto Zimmermann

    2009-07-01

    Full Text Available

    Esse artigo tece uma comparação do Bolsa Família com a experiência internacional, argumentando que os programas de transferência de renda brasileiros jamais podem ser visto como “barbaridade”, e de forma alguma “assombram o Brasil”, assim como também não contribuem para manter e tornar operativa a “pobreza brasileira”. Conforme demonstramos no artigo, programas de transferência de renda similares ao Bolsa Família, porém mais justos e generosos, existem em muitos países da Europa, não sendo encarados como “barbaridade”. Além disso, não existe a intenção política de se extinguir tais programas, pois contribuem para reduzir a fome e diminuir consideravelmente os níveis de

  10. Embolia gasosa venosa inadvertida durante cesariana: bolsas retráteis ​​para líquidos intravenosos sem saídas autovedantes oferecem riscos. Relato de caso

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    Mefkur Bakan

    2013-08-01

    Full Text Available O anestesiologista deve estar ciente das causas, do diagnóstico e do tratamento de embolia venosa e adotar padrões de prática para prevenir sua ocorrência. Embora a embolia gasosa seja uma complicação conhecida da cesariana, descrevemos um caso raro de desatenção que causou embolia gasosa iatrogênica quase fatal durante uma cesariana sob raquianestesia. uma das razões para o uso de bolsas autorretráteis para infusão em vez dos frascos convencionais de vidro ou plástico é a precaução contra embolia gasosa. Também demonstramos o risco de embolia venosa com o uso de dois tipos de bolsas plásticas retráteis (à base de cloreto de polivinil [PVC] e de polipropileno para líquidos intravenosos. As bolsas para líquidos sem saídas autovedantes apresentam risco de embolia gasosa se o sistema de fechamento estiver quebrado, enquanto a flexibilidade da bolsa limita a quantidade de entrada de ar. bolsas à base de pvc, que têm mais flexibilidade, apresentam risco significativamente menor de entrada de ar quando o equipo de administração intravenosa (IV é desconectado da saída. usar uma bolsa pressurizada para infusão rápida sem verificar e esvaziar todo o ar da bolsa IV pode ser perigoso.

  11. Bolsas palpebrales inferiores y blefaroplastia estética: investigación anatomo-quirúrgica

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    J.D. Giacomotti

    2015-03-01

    Full Text Available Abordamos el estudio de las bolsas adiposas palpebrales inferiores contemplando la importancia de dos ejes fundamentales como son, en la práctica, la blefaroplastia estética y el aspecto puramente anatómico. Sobre material formolizado de la región orbitaria y según técnica habitual, practicamos disecciones en cada una de las preparaciones anatómicas mediante las cuales fue posible estudiar, en la mitad inferior de la órbita, el comportamiento de la grasa y de las estructuras involucradas con ella permitiendo además incorporar la noción de la arquitectura del espacio retroseptal ántero-inferior y la de sus compartimentos o subdivisiones medial, central y lateral. Esta línea de investigación anatomo-quirúrgica condujo finalmente al preciso establecimiento de la ubicación y de las principales características de cada uno de los paquetes adiposos palpebrales inferiores.

  12. Seguranca alimentar, renda e Programa Bolsa Familia: estudo de coorte em municipios do interior da Paraiba, Brasil, 2005-2011

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    Caroline Sousa Cabral

    2014-02-01

    Full Text Available Este trabalho tem por objetivo avaliar o impacto do Programa Bolsa Família na superação da Insegurança Alimentar. Realizou-se um estudo de coorte em 2005 e 2011, em amostra de famílias residentes em São José dos Ramos e Nova Floresta, Paraíba, Brasil. Em 2005 foram avaliados 609 domicílios e em 2011 foram encontradas e entrevistadas 406 famílias. Houve aumento da segurança alimentar/insegurança alimentar leve e melhoria nos indicadores socioeconômicos. Percebeu-se uma relação significativa entre a elevação da renda e a melhoria dos níveis de Insegurança Alimentar. O programa impacta positivamente no aumento da renda, propiciando melhorias dos níveis de segurança alimentar/insegurança alimentar leve. Percebeu-se que outras variáveis socioeconômicas podem estar contribuindo na melhoria deste perfil. Diante disso, no combate à insegurança alimentar e nutricional, são necessárias outras políticas e programas que ajam nos demais determinantes.

  13. Velocidad de ajuste del precio de las acciones por sector económico en la Bolsa Mexicana de Valores

    Directory of Open Access Journals (Sweden)

    Verónica Patricia Rodríguez Vázquez

    2009-01-01

    Full Text Available Este estudio analiza la velocidad de ajuste del precio de las acciones de la Bolsa Mexicana de Valores de enero de 1998 a diciembre de 2007; para ello, se agruparon las acciones por sectores económicos y se compararon con el Índice de Precios y Cotizaciones (IPC. Asimismo, se clasificó a los sectores económicos en fuertes y débiles, dependiendo del porcentaje de influencia dentro de la muestra del IPC. Entre los sectores fuertes se ubicó a comunicaciones y transportes, comercio, construcción e industria extractiva; mientras que en los débiles a transformación, servicios y varios. El modelo de regresión utilizado fue el propuesto por Marshall y Walker (2002, con el que se buscó comprobar que los sectores fuertes ajustaban más rápidamente sus precios que los sectores débiles con respecto a la rentabilidad del mercado. Se encontró que existe evidencia de que los retornos de los sectores fuertes se adelantan a los retornos de los sectores débiles, principalmente porque los primeros ajustan más rápidamente sus precios a los movimientos del mercado.

  14. Sonochemical Reactors.

    Science.gov (United States)

    Gogate, Parag R; Patil, Pankaj N

    2016-10-01

    Sonochemical reactors are based on the generation of cavitational events using ultrasound and offer immense potential for the intensification of physical and chemical processing applications. The present work presents a critical analysis of the underlying mechanisms for intensification, available reactor configurations and overview of the different applications exploited successfully, though mostly at laboratory scales. Guidelines have also been presented for optimum selection of the important operating parameters (frequency and intensity of irradiation, temperature and liquid physicochemical properties) as well as the geometric parameters (type of reactor configuration and the number/position of the transducers) so as to maximize the process intensification benefits. The key areas for future work so as to transform the successful technique at laboratory/pilot scale into commercial technology have also been discussed. Overall, it has been established that there is immense potential for sonochemical reactors for process intensification leading to greener processing and economic benefits. Combined efforts from a wide range of disciplines such as material science, physics, chemistry and chemical engineers are required to harness the benefits at commercial scale operation.

  15. Programa Bolsa-Família: qualidade da dieta de população adulta do município de Curitiba, PR Bolsa-Família Program: Diet quality of adult population in Curitiba, Paraná

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    Flávia Emília Leite de Lima

    2013-03-01

    Full Text Available Este estudo avaliou a qualidade da dieta da população beneficiária do Programa Bolsa-Família, em Curitiba, PR. Estudo transversal, de base populacional, realizado no período de julho de 2006 a julho de 2007. Foram entrevistados 747 beneficiários, a partir dos 19 anos de idade, de ambos os sexos. Para avaliação da qualidade da dieta foi aplicado recordatório de 24 horas, e o Índice de Qualidade da Dieta (IQD foi utilizado como parâmetro para classificação do grupo em níveis de consumo. Estatística descritiva foi utilizada para descrever a qualidade da dieta da população. Para a comparação de médias do índice segundo as variáveis socioeconômicas foram realizados o teste t de Wald e a análise de variância ANOVA, considerando-se um nível de significância de 5%. A amostra foi constituída por 91,4% de mulheres e 8,6 % de homens. A média de idade da população foi de 36,4 ± 13,3 anos, com cerca de 75 % possuindo o ensino fundamental incompleto. A média do IQD foi de 51 pontos, o que caracteriza uma dieta que precisa de ajustes. A população possui uma dieta monótona, com um consumo adequado de leguminosas, porém baixo para frutas, verduras e produtos lácteos. Na comparação entre as categorias de qualidade da dieta dos indivíduos, todos os componentes, com exceção do sódio, apresentaram medianas de pontuação estatisticamente diferentes (p This study evaluated the quality of diet of the population receiving the Bolsa Familia Program in Curitiba, state of Parana, Brazil. It was a population-based cross-sectional study, conducted from July 2006 to July 2007. 747 beneficiaries were interviewed from 19 years of age, of both genders. A 24 hour-recall was implemented in order to assess the quality of the diet and the Healthy Eating Index (HEI was used as a parameter for the classification of the group in consumption levels. Descriptive statistics were used to describe the diet quality of the studied population. Wald

  16. Perfil dos pesquisadores com bolsa de produtividade em pesquisa do CNPq da área de saúde coletiva

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    Barata Rita Barradas

    2003-01-01

    Full Text Available O artigo analisa, com base nas informações do currículo Lattes, o perfil dos pesquisadores com bolsa de produtividade em pesquisa do CNPq na área de Saúde Coletiva. A análise levou em conta a formação graduada e pós-graduada, área de atuação, produção e divulgação científica. As comparações são feitas entre as classes de pesquisadores e com dados do diretório de grupos de pesquisa. A maioria dos pesquisadores (70% são formados em Ciências da Saúde, principalmente em Medicina, ou em Ciências Humanas (18%, principalmente Sociologia. Sessenta por cento fizeram mestrado e doutorado em Saúde Coletiva, mas há entre 20 e 30% de pesquisadores, dependendo da classe, sem formação específica na área. A maioria atua em Epidemiologia. A produção científica, expressa em produtos bibliográficos, varia de 10,56 produtos/ano de obtenção do doutorado para os pesquisadores 2C a 6,60 produtos/ano para os pesquisadores 1A. Para artigos completos publicados em periódicos os valores são 3,56 e 2,87, respectivamente. A produção é divulgada principalmente em periódicos A internacional e, A e B nacional. Os periódicos que concentram a publicação são Cadernos de Saúde Pública e Revista de Saúde Pública.

  17. El efecto de la volatilidad del peso mexicano en los rendimientos y riesgo de la Bolsa Mexicana de Valores

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    Raúl de Jesús Gutiérrez

    2013-01-01

    Full Text Available El efecto de las colas pesadas originado por los eventos extremos y los diferentes niveles de asimetría asociados a la alta volatilidad en aglomeraciones en los mercados financieros de economías emergentes requieren de modelos más sofisticados para su modelación. El objetivo de esta investigación es aplicar la teoría de valores extremos (TVE para cuantificar el riesgo de la cola de los rendimientos diarios de la Bolsa Mexicana de Valores bajo la agregación del riesgo del tipo de cambio durante el periodo de enero de 1971 a diciembre de 2010. Este análisis sugiere el uso de la distribución de valor extremo generalizada y la técnica de bloques máximos para explicar el comportamiento asintótico de los rendimientos extremos. Los resultados empíricos muestran el potencial de la medida VaR basada en la TVE para capturar las propiedades de colas pesadas en los rendimientos de los mercados accionarios altamente volátiles a diferencia de los modelos VaR convencionales. Además, la evidencia empírica demuestra que los inversionistas internacionales con posiciones financieras largas están más propensos a experimentar pérdidas más grandes que los que toman posiciones cortas en el mercado accionario mexicano durante periodos de crisis financieras y depreciaciones de la moneda local.

  18. Evaluación de tres tipos de empaque (bolsas de polietileno para almacenamiento de guayaba manzana (Psidium guajava var., Klom sali

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    Luis Román Ardila Núñez

    2011-05-01

    Full Text Available La Universidad Nacional de Colombia, a través del Departamento de Ingeniería Agrícola de Santafé de Bogotá, ha venido adelantando investigación sobre manejo postcosecha de productos hortofrutícolas, con miras a minimizar las pérdidas de estos productos y a conservar su calidad. En el presente artículo se muestran los resultados obtenidos de comportamiento del fruto guayaba manzana (Psidium guajava varoKlom Sali, al ser almacenado en frío con bolsas de polietileno de baja densidad de tres tipos: abierto, perforado y cerrado, a una temperatura de 10ºC y humedad relativa de 95 %. Se compararon los resultados durante los días del almacenamiento, tomando como base los índices de madurez del fruto, tales como la pérdida de peso, la intensidad respiratoria, la firmeza, el contenido deácidos, el contenido de sólidos solubles y el pH. Además, se tomaron datos del almacenamiento de este fruto en bolsas abiertas del mismo tipo, en condiciones ambiente (temperatura 20,1 ºC y humedad relativa de 50,3 %, lo cual se utilizó como testigo. De esta investigación se concluyó que la mejor condición de almacenamiento es en frío con bolsa cerrada, pues el producto conserva mejor su calidad que en los otros dos tipos de empaques evaluados.

  19. Conciliação e tensões entre trabalho e família para mulheres titulares do Programa Bolsa Família

    OpenAIRE

    Mariano,Silvana Aparecida; Souza,Márcio Ferreira de

    2015-01-01

    Resumo Este artigo interroga as condições que mulheres titulares do Programa Bolsa Família (PBF) enfrentam para a conciliação entre trabalho remunerado e cuidados familiares, os obstáculos para essa conciliação e os possíveis impactos positivos e negativos para a situação delas, com vistas à redução das desigualdades de gênero. Com base em survey realizado em Curitiba (PR) e Fortaleza (CE), aponta as dificuldades para o compartilhamento de tarefas de cuidados domésticos com outros membros fam...

  20. Evaluación de la terapia mecánica periodontal en bolsas profundas: Respuesta clínica y bacteriológica

    OpenAIRE

    Bazzano, G.; Parodi, R.; Tabares, S; Sembaj,A

    2012-01-01

    Objetivos: Evaluar la composición microbiológica y los parámetros clínicos de bolsas periodontales ≥5 mm de profundidad al inicio, 1 semana, 3 y 12 meses post raspado y alisado radicular. Materiales y Métodos: Se tomaron registros clínicos y muestras de placa subgingival de 44 sitios de pacientes con diagnóstico de periodontitis crónica. Se identificaron por técnica de Reacción en Cadena de la Polimerasa (PCR) patógenos putativos periodontales: Aggregatibacter actinomycetemcomitans (Aa)...

  1. Vivienda e integración de grupos sociales vulnerables en la ciudad. El caso de la Operación Bolsas de Deterioro Urbano en Madrid

    Directory of Open Access Journals (Sweden)

    Ángela Bedoya Ruiz

    2014-06-01

    Full Text Available ResumenEn el contexto urbano europeo, se ha abordado de forma común la integración de grupos vulnerables, ya sea económica o socialmente, a través de políticas de vivienda y programas de realojo. Sin embargo, este tipo de medidas y sus efectos son muy discutidos principalmente en base a la excesiva atención que se presta a la transformación espacial de ámbitos reducidos, y la limitada incidencia de este tipo de actuaciones sobre otros factores de la exclusión social. El presente estudio busca, a partir de un caso en concreto, la operación de Bolsas de Deterioro Urbano en Madrid, vincular los procesos de planificación urbanística y gestión del suelo a aquellos referentes a la integración social de grupos vulnerables en la ciudad. Se concluye que cambios efectuados en las disposiciones de ordenación y gestión de algunas de las áreas de la operación, así como la falta de seguimiento tanto de procesos de desarrollo urbano posteriores a las intervenciones efectuadas, como de los efectos que el realojo ha significado para la población objeto, desvían a ésta de su postura ideológica inicial.Palabras claveRemodelación urbana, renovación urbana, integración social, bolsas de Deterioro Urbano, Madrid.AbstractIn the context of European urban development, housing policies and relocation programmes are commonly used to foster urban integration of vulnerable social groups. However, this kind of measures and their associated effects are still up for debate due to the excessive attention paid to the relevance of spatial transformation of reduced areas, and the limited impact this one has on other aspects of social exclusion. This article, through the analysis of a specific case, the Bolsas de Deterioro Urbano programme in Madrid, attempts to link spatial planning and land management processes to those of social integration in the urban environment. We conclude that alterations made to the management and land use dispositions of some of

  2. Síndrome de la orina morada en bolsa en paciente anciana con suplementos nutricionales Purple urine bag syndrome in elderly woman with nutritional supplements

    OpenAIRE

    A.R. Domínguez Alegría; M. Vélez Díaz-Pallares; M.ª A. Moreno Cobo; F. Arrieta Blanco; T. Bermejo Vicedo

    2012-01-01

    El síndrome de la orina morada en bolsa es una entidad poco frecuente que afecta característicamente a mujeres de edad avanzada con sondaje vesical prolongado y debilitadas por enfermedades crónicas. La presencia de patología urológica previa, el encamamiento prolongado y el estreñimiento crónico son factores predisponentes. El color morado de la orina se debe a la presencia de elevadas concentraciones de bacterias con actividad indoxilsulfatasa/fosfatasa que se desarrollan en un ambiente alc...

  3. ¿Pagamos las bolsas de plástico? trabajando en el aula con los objetivos de la educación ambiental en mente

    OpenAIRE

    Uskola Ibarluzea, A.; Maguregui González, G.; Fernández Alonso, M.; Antón Baranda, Á.

    2009-01-01

    En esta comunicación se presenta una actividad de Educación Ambiental (EA) llevada a cabo con alumnado de 3º de la Diplomatura de Educación Social, en la que se pretendía trabajar los cinco objetivos de la EA. La actividad ha consistido en la búsqueda de información y toma de decisión, por parte del alumnado, en torno a la imposición de una hipotética tasa a las bolsas de plástico. Los primeros resultados indican que buena parte del alumnado participante cree que ha conocido diferentes aspect...

  4. Modelo matemático para el reporte financiero que estima el rendimiento de las acciones de empresas que cotizan en la Bolsa Mexicana de Valores.

    OpenAIRE

    García Padilla, Víctor Manuel.

    2015-01-01

    Esta investigación se encuentra dentro del campo del estudio de la teoría de los mercados eficientes en su forma semifuerte. En particular aborda el tema de los reportes financieros y su relación con los rendimientos en el precio de las acciones de las empresas del sector de la construcción de vivienda que integran el índice Habita de la Bolsa Mexicana de Valores. Tiene por objetivo proponer un modelo matemático de análisis financiero que se integre a los reportes financiero...

  5. Relación entre la presencia de bolsas periodontales y las alteraciones del perfil lipídico en pacientes con ateroesclerosis

    OpenAIRE

    Ruiz Alvarez, Carmen; Pareja Vásquez, María del Carmen

    2006-01-01

    Objetivo: determinar la relación entre la presencia de bolsas periodontales y la alteración en los valores del perfil lipídico (niveles plasmáticos de colesterol, triglicéridos, HDL, LDL) en pacientes con ateroesclerosis. Material y método: investigación de tipo descriptiva correlacional. Se examinó a 114 pacientes de ambos sexos, con edades entre 35 y 65 años. Fueron clasificados en dos grupos: un grupo de 38 pacientes sanos y otro de 38 pacientes que tenían perfil lipídico controlado y arte...

  6. PROGRAMA INSTITUCIONAL DE BOLSAS DE INICIAÇÃO À DOCÊNCIA-FILOSOFIA/UFSM: DISPOSITIVO DE PRÁTICAS DOCENTES

    OpenAIRE

    2012-01-01

    Na presente pesquisa, realizada junto ao Programa de Pós-graduação em Educação da Universidade Federal de Santa Maria, na linha de pesquisa denominada Práticas Escolares e Políticas Públicas, investiga-se o movimento produzido pelo Programa Institucional de Bolsas de Iniciação à Docência (PIBID) no curso de Licenciatura em Filosofia da Universidade Federal de Santa Maria (UFSM). Assim, buscou-se compreender como o referido Programa se constituiu em dispositivo produtor de práti...

  7. An??lisis de la Bolsa Mexicana de Valores a trav??s de m??todos estad??sticos = Analysis of Mexican Stock Exchange through statistical methods

    OpenAIRE

    2014-01-01

    El objeto de estudio de este Trabajo de Fin de Grado, consiste en estudiar y analizar el comportamiento del mercado mexicano de valores mediante una serie de m??todos estad??sticos. El estudio se apoya en la metodolog??a correspondiente a estas t??cnicas para la aplicaci??n del an??lisis emp??rico. El prop??sito principal es comprobar que variables macroecon??micas influyen de manera m??s notable en el mercado burs??til, as?? como la clasificaci??n de las empresas que cotizan en la Bolsa M...

  8. Estudo físico e físico-químico de diferentes filmes de bolsas de sangue visando a segurança frente ao processamento hemoterapêutico

    OpenAIRE

    Verceze,Armando V.; Newton L. Pereira; Buzzo,Everton J.

    2006-01-01

    Muitas rupturas de bolsas de sangue no processamento e armazenamento levam à abertura do sistema e à perda do conteúdo, com prejuízos econômicos, riscos biológicos e aspectos sociais pela doação voluntária (dados levantados junto a serviços de hemoterapia pelo autor). O propósito foi avaliar "in vitro", por meio de teste cego, diferentes filmes de bolsas de poli (cloreto de vinila)-PVC para coleta de sangue disponíveis no mercado nacional, sendo três produzidas no Brasil e duas no exterior, u...

  9. Causalidad del precio futuro de la Bolsa de Chicago sobre los precios físicos de maíz blanco en México

    Directory of Open Access Journals (Sweden)

    José Alberto Godínez Placencia

    2007-01-01

    Full Text Available Desde 1993 el gobierno federal mexicano, a través de Apoyos y Servicios a laComercialización Agropecuaria (ASERCA,ha estado utilizando los futuros y opciones de la Bolsa de Chicago de los Estados Unidos como instrumentos paracubrir el riesgo de movimientos adversosde los precios físicos al productor y almayoreo de maíz blanco. El objetivo delpresente trabajo es validar, para el casodel maíz blanco, la pertinencia de usar lascoberturas de los EEUUpara cubrir el riesgo de los precios físicos en México. El conjunto de procedimientos econométricos del vector auto regresivo (función impulso-respuesta, descomposición de la varianza y la causalidad de Granger rechaza la hipótesis de que el precio futuro delmaíz amarillo US #2 de la Bolsa deChicago mantiene una relación de causalidad sobre los precios físicos semanalesde maíz blanco en México para el periodo 1998-2005, por lo que la cobertura internacional no es pertinente.

  10. Consideraciones para calcular el ratio precio-utilidad de la bolsa de Valores de Lima: metodología y aplicaciones

    Directory of Open Access Journals (Sweden)

    Javier Pereda

    2012-06-01

    Full Text Available En el presente trabajo se elabora una metodología para calcular el ratio precio-utilidad (PER del Índice General de la Bolsa de Valores de Lima (IGBVL en el periodo 1995-2011, dentro del enfoque planteado por Shiller (2005. A partir del PER calculado se estima la prima por riesgo del mercado de acciones (implicitequity premia, siguiendo la metodología planteada por Hayford y Malliaris (2004. Tanto el PER como la prima por riesgo estimadas se usan como indicadores para evaluar el desempeño del mercado de acciones en el periodo analizado. Los resultados muestran que los precios de las acciones respondieron básicamente a la evolución esperada de las utilidades de las empresas, incluso durante el periodo de auge de la bolsa de valores que precedió a la crisis financiera externa del 2008, sin evidencia de que haya existido una sobrevaluación en este mercado.

  11. Condicionalidades em saúde do programa Bolsa Família – Brasil: uma análise a partir de profissionais da saúde

    Directory of Open Access Journals (Sweden)

    Alice Teles de Carvalho

    2014-12-01

    Full Text Available Este estudo apresenta a percepção de profissionais de equipes de Saúde da Família de municípios do Nordeste do Brasil acerca das mudanças na vida das famílias participantes do programa Bolsa Família, da relação destas com os serviços de saúde e do impacto na dinâmica de trabalho dos profissionais, a partir do acompanhamento das condicionalidades de saúde do programa Bolsa Família. As informações foram obtidas por meio de entrevistas semiestruturadas e encontros de grupo focal. Os profissionais acreditam que o programa ocasionou mudanças favoráveis na vida das famílias participantes, como a redução da pobreza, o aumento da frequência escolar das crianças e mudanças positivas na relação entre as famílias participantes e os serviços de saúde. No entanto, relataram dificuldades de caráter organizacional no acompanhamento das condicionalidades, sobretudo devido ao aumento da demanda de trabalho. É importante que as condicionalidades de saúde proporcionem oportunidades para a realização de ações que visem ao empoderamento e autonomia dos sujeitos quanto ao autocuidado e desenvolvimento da cidadania.

  12. [Intersectoral, convergent and sustainable actions: the challenges of the "Bolsa Família" program in Manguinhos shantytown in Rio de Janeiro].

    Science.gov (United States)

    Magalhães, Rosana; Coelho, Angela Virginia; Nogueira, Milena Ferreira; Bocca, Cláudia

    2011-11-01

    Some studies have revealed the impact of the family welfare allowance based on the fulfillment of certain conditions on improving living conditions and access to health and education services in different countries. However, gaps persist relating to the evaluation of the benefits of such programs among the groups that have greater difficulty in gaining access to public services or advances in the quality of education and school performance. Moreover, there is limited evidence of adequacy of the program to the respective contexts of implementation, levels of adhesion and local cooperation and strategies adopted for integration with other social policy programs. The scope of this article is to discuss the findings of the study of the implementation of the "Bolsa Familia" in the Manguinhos shantytown area in Rio de Janeiro conducted in 2007 and 2008 based on semi-structured interviews with program officials and local stakeholders. In conclusion, the study shows that the sustainability of "Bolsa Familia" actions to reduce poverty and promote health equity calls for strengthening the vertical and horizontal communication channels between government levels, public managers and civil associations, recognition of the complexity of the local social demands and an intersectoral agenda.

  13. Hybrid adsorptive membrane reactor

    Science.gov (United States)

    Tsotsis, Theodore T. (Inventor); Sahimi, Muhammad (Inventor); Fayyaz-Najafi, Babak (Inventor); Harale, Aadesh (Inventor); Park, Byoung-Gi (Inventor); Liu, Paul K. T. (Inventor)

    2011-01-01

    A hybrid adsorbent-membrane reactor in which the chemical reaction, membrane separation, and product adsorption are coupled. Also disclosed are a dual-reactor apparatus and a process using the reactor or the apparatus.

  14. D and DR Reactors

    Data.gov (United States)

    Federal Laboratory Consortium — The world's second full-scale nuclear reactor was the D Reactor at Hanford which was built in the early 1940's and went operational in December of 1944.D Reactor ran...

  15. Hybrid adsorptive membrane reactor

    Science.gov (United States)

    Tsotsis, Theodore T.; Sahimi, Muhammad; Fayyaz-Najafi, Babak; Harale, Aadesh; Park, Byoung-Gi; Liu, Paul K. T.

    2011-03-01

    A hybrid adsorbent-membrane reactor in which the chemical reaction, membrane separation, and product adsorption are coupled. Also disclosed are a dual-reactor apparatus and a process using the reactor or the apparatus.

  16. Perfil dos pesquisadores com bolsa de produtividade em pesquisa do CNPq da área de fonoaudiologia

    Directory of Open Access Journals (Sweden)

    Rosely de Fátima Pellizzon

    2014-10-01

    Full Text Available OBJETIVO: identificar o perfil dos bolsistas de produtividade em pesquisa do Conselho Nacional de Desenvolvimento Científico e Tecnológico - CNPq, na área de Fonoaudiologia.MÉTODOS: a partir da lista dos bolsistas de produtividade da área de Fonoaudiologia com bolsas vigentes em 2010, foram verificadas características de formação, publicação de artigos nas bases de dados: LILACS, SciELO Brasil, MEDLINE e Web of Science, identificando a produção de artigos científicos dos bolsistas na comunidade científica brasileira, publicados no período de 2006-2010. Também foi utilizado o indicador JCR e a classificação Qualis para análise das revistas.RESULTADOS: das 46 bolsistas, 45 (98% são graduadas em Fonoaudiologia e exercem a atividade de docência, 22 (47,83% na Região Sudeste e 24 (52,17% têm vínculo institucional nas universidades públicas (estaduais. Em relação à produção, foram identificados 935 artigos, sendo 816 (87,27% em 48 revistas brasileiras e 119 (12,72%em 47 revistas estrangeiras.Comrespeito às revistas, dos 95 títulos brasileiros e estrangeiros analisados, 38 (40% não apresentam o fator de impacto.CONCLUSÕES: a presença feminina é grande nesta área do conhecimento, sendo a maior ocorrência de pesquisadoras PQ com vinculação institucional nas universidades públicas, localizadas nas regiões Sudeste e Sul do país. A análise da produção de artigos científicos das bolsistas de Fonoaudiologia mostrou uma tendência a publicar seus artigos em revistas brasileiras, sem deixar de buscar a qualidade editorial: revisão de pares e indexação em bases de dados, aliadas ao indicador JCR e àclassificação do Qualis.

  17. Estudo da viabilidade do enxerto de ovário na bolsa omental de ratos utilizando Ciclosporina A

    Directory of Open Access Journals (Sweden)

    Brito Nara Macedo Botelho

    2005-01-01

    Full Text Available OBJETIVO: Estudo comparativo do enxerto autólogo e heterólogo de ovário na bolsa omental de ratas, utilizando ciclosporina A. MÉTODOS: No presente estudo, foram utilizadas 20 ratas distribuídas randomicamente em quatro grupos, denominados grupo controle (animais submetidos à ooforectomia; grupo A (enxerto autólogo de ovário; grupo H (enxerto heterólogo de ovário; e grupo C (enxerto heterólogo de ovário e tratamento com ciclosporina A. Todos os animais foram submetidos à ooforectomia bilateral. Um dos ovários removidos foi individualizado e enxertado no omento maior do animal. Os animais do grupo C receberam a dose de 10mg/kg/dia de ciclosporina por via subcutânea durante todo o período do experimento. Após um período de 33 dias, todos os animais foram submetidos a uma nova intervenção cirúrgica para identificação do leito receptor e retirada do ovário transplantado, além do útero e da vagina, seguido de eutanásia. As peças foram submetidas a processamento histológico e coloras pela hematoxilina eosina. RESULTADOS: Todos os grupos apresentaram epitélios vaginal e uterino com 1 a 2 fileiras de células cúbicas ou cilíndricas simples, núcleo arredondado e central. Houve também grande reação inflamatória em todo o enxerto, com áreas de necrose. Ocorreu óbito de um animal do grupo C no 20º dia do experimento. CONCLUSÃO: Conclui-se que o enxerto de ovário íntegro realizado em omento maior de ratas nesta amostra, independente do uso da Ciclosporina, não mostrou-se viável.

  18. Reactor and method of operation

    Science.gov (United States)

    Wheeler, John A.

    1976-08-10

    A nuclear reactor having a flattened reactor activity curve across the reactor includes fuel extending over a lesser portion of the fuel channels in the central portion of the reactor than in the remainder of the reactor.

  19. Ressecção de bolsa hiperfuncionante para tratamento de hipotonia ocular crônica: relato de casos Resection of overfiltration bleb for the treatment of chronic ocular hypotony: case reports

    Directory of Open Access Journals (Sweden)

    Sebastião Cronemberger

    2004-08-01

    Full Text Available Relatar os resultados obtidos com a ressecção de bolsa hiperfuncionante pós-trabeculectomia (TREC com mitomicina C (MMC para o tratamento da hipotonia ocular crônica. Cinco pacientes portadores de hipotonia ocular crônica causada por hiperfunção de bolsa fistulante pós- trabeculectomia com mitomicina foram tratados pela ressecção da bolsa. O diagnóstico de hiperfunção da bolsa foi feito com base em critérios estabelecidos pelos autores. A hipotonia ocular foi revertida nos cinco pacientes, sem medicação num seguimento mínimo de cinco e máximo de 26 meses (média de 14,0 ± 7,9 meses. A ressecção da bolsa foi procedimento eficaz para reverter a hipotonia ocular crônica causada pela hiperfunção da mesma pós-trabeculectomia com mitomicina.To present the results of bleb resection for the treatment of overfiltering bleb after trabeculectomy with mitomycin C (MMC associated with chronic ocular hypotony. Five patients with chronic ocular hypotony caused by overfiltering bleb underwent bleb resection. The authors established the criteria for the diagnosis of overfiltering bleb. Ocular hypotony was reversed in all patients without medication. The mean follow-up was 14.0 ± 7.9 months. Bleb resection is a good approach for the treatment of chronic ocular hypotony secondary to overfiltering bleb.

  20. Society-State relationships, citizen participation and political clientelism inside programs that combat poverty. The case of «Bolsa Familia» in Brazil Relaciones sociedad-estado, participación ciudadana y clientelismo político en programas contra la pobreza. El caso de «bolsa familia» en Brasil

    Directory of Open Access Journals (Sweden)

    Felipe J. HEVIA

    2011-06-01

    Full Text Available Relations between poor people and the government that creates the Programa Bolsa Familia at Brazil may be summarized in two dimensions: 1 favor direct relationships without the intervention of collective action and 2 are distant relations in terms of type of interaction and communication between the authorities and beneficiaries. While there are instances of formal social control, operation of the program makes minimal intermediation and highly institutional and civic organizations have little room to act and to represent the beneficiaries of Bolsa Familia in institutionalized interfaces. Direct links generate positive effect low levels of political patronage vote buying and coercion, but also generate unintended effects such as the lack of program operation, difficulty to defend themselves collectively by irregularities and create an active citizenry.Las relaciones entre los pobres y el gobierno que genera la implementación del programa Bolsa Familia pueden resumirse en dos dimensiones: 1 se privilegian «relaciones directas» sin intermediación de acción colectiva y 2 también «relaciones lejanas» en términos del tipo de interacción y comunicación entre las autoridades y los beneficiarios. Si bien existen instancias formales de control social, la operación del programa hace que la intermediación sea mínima, altamente institucional y que las organizaciones civiles tengan poco espacio para actuar representando a los beneficiarios. Estas relaciones generan bajos niveles de compra y coacción del voto, pero crean también efectos no intencionales como son el desconocimiento de la operación del programa, dificultad para defenderse de manera colectiva de abusos de poder, así como obstáculos para generar ciudadanía activa.

  1. Keloid heterograft in the hamster (Mesocricetus auratus cheek pouch Heteroenxerto de quelóide na bolsa jugal do hamster (Mesocricetus auratus

    Directory of Open Access Journals (Sweden)

    Bernardo Hochman

    2005-06-01

    Full Text Available PURPOSE: To study the integration of keloid heterograft in hamster (Mesocricetus auratus cheek pouch. METHODS: The sample is formed by 18 male hamsters, heterogenic ones, aged between 10 and 14 weeks. Keloid fragments were obtained from keloid scars of the breast region of adult female mulatto patient. Each hamster received keloid fragments into both of its pouches, in a total of 36 grafted fragments. Animals were distributed into 6 groups for having their grafts assessed in the days 5, 12, 21, 42, 84, and 168. A macroscopic assessment is performed by comparing the pouch containing the grafted fragment, at each time point, with the same pouch in the immediate post surgical moment through a comparison of standardized photographs. Under microscope, the presence of blood vases is considered within the conjunctive tissue of the grafted fragment, as a criterion of its integration. Other events, as keratin secretion, the presence of cellular infiltrated, epithelium and keloid collagen fibers aspects are also analyzed. RESULTS: Macroscopy reveals intensive vascularization of the pouch up to 12 days from the transplantation and the presence of constant dark brown pigmentation on the grafted keloid fragments. In microscopy, the integration of keloid fragments is considered by the presence of blood capillary vases within conjunctive tissue. The presence of intensive cellular inflammatory type infiltrated up to 12 days is also observed, as well as the remaining of keloid epithelium up to 21 days, and the appearing of melanocytes from the day 42. CONCLUSION: Hamster cheek pouch represents, a priori, an experimental model for the investigation of keloid.OBJETIVO: Investigar a integração do transplante heterólogo de quelóide na bolsa jugal do hamster (Mesocricetus auratus. MÉTODOS: A amostragem consiste de 18 hamsters machos, heterogênicos, com 10 a 14 semanas de idade. Fragmentos de quelóide foram obtidos de cicatrizes queloidianas da região mam

  2. Notas preliminares de uma crítica feminista aos programas de transferência direta de renda: o caso do Bolsa Família no Brasil = Preliminary notes of a feminist critique to income transference programs: the case of “Bolsa Familia” in Brazil

    Directory of Open Access Journals (Sweden)

    Gomes, Simone da Silva Ribeiro

    2011-01-01

    Full Text Available Nos últimos anos, os programas de “luta contra a pobreza” e transferência direta de renda estão presentes na maioria dos países latino-americanos. A partir do primeiro ano de governo do presidente Lula (2003, o Brasil enfatiza esta forma de política social, ao unificar diferentes modelos de transferência do governo anterior (1995-2002 em um só programa: o Bolsa Família. O artigo em questão busca expor a crítica da regulação da pobreza e o impacto das condicionalidades referentes a esta lógica de intervenção na reprodução social de um grupo específico. A relação entre o Estado e as mulheres – responsáveis únicas pelo sustento financeiro de suas casas e, majoritariamente, as maiores beneficiárias destes programas – é caracterizada por atravessamentos em termos de classe social, gênero e raça. Ao apresentar a perspectiva feminista, o artigo procura abrir uma série de questões ao analisar como as condicionalidades impostas pelo Programa Bolsa Família tendem a naturalizar o papel reprodutivo das mulheres na sociedade brasileira, limitando seu espaço de agenciamento e emancipação

  3. Reactor Physics Programme

    Energy Technology Data Exchange (ETDEWEB)

    De Raedt, C

    2000-07-01

    The Reactor Physics and Department of SCK-CEN offers expertise in various areas of reactor physics, in particular in neutronics calculations, reactor dosimetry, reactor operation, reactor safety and control and non-destructive analysis on reactor fuel. This expertise is applied within the Reactor Physics and MYRRHA Research Department's own research projects in the VENUS critical facility, in the BR1 reactor and in the MYRRHA project (this project aims at designing a prototype Accelerator Driven System). Available expertise is also used in programmes external to the Department such as the reactor pressure steel vessel programme, the BR2 reactor dosimetry, and the preparation and interpretation of irradiation experiments. Progress and achievements in 1999 in the following areas are reported on: (1) investigations on the use of military plutonium in commercial power reactors; (2) neutron and gamma calculations performed for BR-2 and for other reactors; (3) the updating of neutron and gamma cross-section libraries; (4) the implementation of reactor codes; (6) the management of the UNIX workstations; and (6) fuel cycle studies.

  4. LMFBR type reactor

    Energy Technology Data Exchange (ETDEWEB)

    Kawakami, Hiroto

    1995-02-07

    A reactor container of the present invention has a structure that the reactor container is entirely at the same temperature as that at the inlet of the reactor and, a hot pool is incorporated therein, and the reactor container has is entirely at the same temperature and has substantially uniform temperature follow-up property transiently. Namely, if the temperature at the inlet of the reactor core changes, the temperature of the entire reactor container changes following this change, but no great temperature gradient is caused in the axial direction and no great heat stresses due to axial temperature distribution is caused. Occurrence of thermal stresses caused by the axial temperature distribution can be suppressed to improve the reliability of the reactor container. In addition, since the laying of the reactor inlet pipelines over the inside of the reactor is eliminated, the reactor container is made compact and the heat shielding structures above the reactor and a protection structure of container walls are simplified. Further, secondary coolants are filled to the outside of the reactor container to simplify the shieldings. The combined effects described above can improve economical property and reliability. (N.H.).

  5. Empoderamento das mulheres beneficiárias do Programa Bolsa Família na percepção dos agentes dos Centros de Referência de Assistência Social

    Directory of Open Access Journals (Sweden)

    Nathalia Carvalho Moreira

    2012-04-01

    Full Text Available Este trabalho teve como objetivo analisar o empoderamento das mulheres beneficiárias do Programa de Transferência de Renda, conhecido como "Programa Bolsa Família", na percepção dos agentes sociais dos Centros de Referência de Assistência Social (Cras. Para tanto, realizou-se um estudo de caso múltiplo, tendo como sujeitos de pesquisa 11 gestores de diferentes Cras do estado de Minas Gerais. A partir da técnica de análise de conteúdo, as respostas das perguntas, que compuseram as entrevistas, foram agrupadas de acordo com as categorias Bolsa Família, Cras e Mulher. Os resultados apontam a importância do Cras na execução do Programa Bolsa Família e no processo de empoderamento, pois a convivência e a participação neste local têm contribuído para a conscientização sobre direitos, para a inserção social e para a melhoria do bem-estar das mulheres, fatores evidenciados por intermédio do interesse das mulheres por cursos, oficinas, informações sobre programas sociais e atendimento psicológico. Na percepção dos agentes, foi possível observar melhoria nas condições de vida, nas relações familiares, conscientização e autoestima, implicando reflexos sobre o empoderamento feminino. Portanto, embora sendo um processo lento e embrionário, pode-se dizer que o ciclo do empoderamento das mulheres beneficiárias do Bolsa Família pode ser completado, pois consegue atingir as três dimensões (individual, familiar e comunitária.

  6. Light water reactor safety

    CERN Document Server

    Pershagen, B

    2013-01-01

    This book describes the principles and practices of reactor safety as applied to the design, regulation and operation of light water reactors, combining a historical approach with an up-to-date account of the safety, technology and operating experience of both pressurized water reactors and boiling water reactors. The introductory chapters set out the basic facts upon which the safety of light water reactors depend. The central section is devoted to the methods and results of safety analysis. The accidents at Three Mile Island and Chernobyl are reviewed and their implications for light wate

  7. Nuclear reactor physics

    CERN Document Server

    Stacey, Weston M

    2010-01-01

    Nuclear reactor physics is the core discipline of nuclear engineering. Nuclear reactors now account for a significant portion of the electrical power generated worldwide, and new power reactors with improved fuel cycles are being developed. At the same time, the past few decades have seen an ever-increasing number of industrial, medical, military, and research applications for nuclear reactors. The second edition of this successful comprehensive textbook and reference on basic and advanced nuclear reactor physics has been completely updated, revised and enlarged to include the latest developme

  8. Spinning fluids reactor

    Science.gov (United States)

    Miller, Jan D; Hupka, Jan; Aranowski, Robert

    2012-11-20

    A spinning fluids reactor, includes a reactor body (24) having a circular cross-section and a fluid contactor screen (26) within the reactor body (24). The fluid contactor screen (26) having a plurality of apertures and a circular cross-section concentric with the reactor body (24) for a length thus forming an inner volume (28) bound by the fluid contactor screen (26) and an outer volume (30) bound by the reactor body (24) and the fluid contactor screen (26). A primary inlet (20) can be operatively connected to the reactor body (24) and can be configured to produce flow-through first spinning flow of a first fluid within the inner volume (28). A secondary inlet (22) can similarly be operatively connected to the reactor body (24) and can be configured to produce a second flow of a second fluid within the outer volume (30) which is optionally spinning.

  9. Avaliando resultados de um programa de transferência de renda: o impacto do Bolsa-Escola sobre os gastos das famílias brasileiras

    Directory of Open Access Journals (Sweden)

    Anne Caroline Costa Resende

    2008-01-01

    Full Text Available Este trabalho tem como objetivo analisar os efeitos de programas de transferências monetárias sobre os gastos totais bem como sobre seus componentes para as famílias beneficiárias no Brasil, através do programa Bolsa-Escola. Para se alcançar tal objetivo é adotado um método não- experimental conhecido como pareamento baseado no escore de propensão (propensity score matching, utilizando os microdados da Pesquisa de Orçamentos Familiares (POF 2002-2003. Realiza-se, ainda, uma análise de sensibilidade dos resultados obtidos a fim de se verificar a robustez do método à presença de variáveis não observadas, bem como à especificação do modelo de escore de propensão. Os resultados estimados sugerem um efeito positivo das transferências monetárias sobre o consumo das famílias pobres beneficiárias. O fato de os recursos serem prioritariamente destinados a despesas com alimentos, educação, produtos de higiene e vestuário em detrimento de itens como bebidas e cigarros, despesas diversas e bens duráveis significa que, em alguma medida, estes recursos estão sendo gastos de forma eficiente. É provável, também, que o aumento do consumo destas famílias eleve o seu nível de bem-estar, representando um "alívio" imediato sobre a pobreza.The aim of this work is to analyze the effects of cash transfers of public programs on household’s expenditures and their components, taking the Brazilian program Bolsa-Escola as a representative example. It is used a non experimental method called propensity score matching, with microdata from the Pesquisa de Orçamentos Familiares (POF 2002-2003. Further, a sensitivity analysis is carried to certify that the propensity score model is well specified and still works in the presence of unobservable variables. Results suggest a positive effect of cash transfers on the poor beneficiary household’s consumption. The fact that household’s expenditures are concentrated on education, hygiene

  10. Reactor Vessel Surveillance Program for Advanced Reactor

    Energy Technology Data Exchange (ETDEWEB)

    Jeong, Kyeong-Hoon; Kim, Tae-Wan; Lee, Gyu-Mahn; Kim, Jong-Wook; Park, Keun-Bae; Kim, Keung-Koo

    2008-10-15

    This report provides the design requirements of an integral type reactor vessel surveillance program for an integral type reactor in accordance with the requirements of Korean MEST (Ministry of Education, Science and Technology Development) Notice 2008-18. This report covers the requirements for the design of surveillance capsule assemblies including their test specimens, test block materials, handling tools, and monitors of the surveillance capsule neutron fluence and temperature. In addition, this report provides design requirements for the program for irradiation surveillance of reactor vessel materials, a layout of specimens and monitors in the surveillance capsule, procedures of installation and retrieval of the surveillance capsule assemblies, and the layout of the surveillance capsule assemblies in the reactor.

  11. Prospección geológica y geofísica de sulfuros en el área de Virorco-La Bolsa, provincia de San Luis Geological and geophysical sulfide prospection in the Virorco-La Bolsa area, San Luis province

    Directory of Open Access Journals (Sweden)

    J. Kostadinoff

    2005-09-01

    Full Text Available En los cuerpos máficos-ultramáficos del área de Virorco y La Bolsa, bloque central de la sierra de San Luis, se han detectado sulfuros polimetálicos en venillas y diseminados. Como herramienta de prospección geofísica se utilizó el método de autopotencial en combinación con estudios geomagnéticos. Los lentes máfico-ultramáficos están enmarcados por una caja gnéisicamigmatítica de alto grado. Una foliación milonítica de rumbo NNE y buzamiento de alto ángulo al ESE, afecta al basamento y también a los bordes de los cuerpos máfico-ultramáficos. Hacia el interior de estos últimos, alternan sectores que preservan las texturas granulares ígneas y una foliación buzante al oeste, con fajas de cizalla con foliación milonítica buzante al ESE. El estudio geofísico en Virorco indica una correspondencia entre los valores de autopotencial negativos (-150 mV y los máximos de magnetismo terrestre (+350 nT. En la zona de La Bolsa se realizaron dos perfiles de autopotencial, los cuales muestran un núcleo de autopotencial negativo de entre -40 y -55 mV, ligeramente alargado y buzante al ESE. Sobre el margen oriental, un valor de -90 mV constituye el núcleo de una anomalía alargada y también buzante al ESE. La disposición espacial de estas anomalías es coincidente con la orientación de la foliación milonítica. La correspondencia establecida con esta nueva herramienta de prospección, sustenta la removilización y concentración de los sulfuros primarios diseminados durante el evento de milonitización, ya planteada previamente en base a otras técnicas de estudio.In the Virorco and La Bolsa mafic-ultramafic bodies, central block of the Sierra de San Luis, polymetallic sulfides occur in veinlets and disseminated. The autopotential method in combination with geomagnetic studies, were utilized as geophysical prospection tools. The maficultramafic lenses are surrounded by high-grade gneissic-migmatitic country-rocks. A penetrative

  12. Main food sources of carotenoids, according to the purpose and degree of processing, for beneficiaries of the 'Bolsa Família' in Brazil

    Directory of Open Access Journals (Sweden)

    Alan Giovanini de Oliveira Sartori

    2014-06-01

    Full Text Available The intake of carotenoids is associated with antioxidant properties and some of these substances have activity of pro-vitamin A. This study aimed to estimate the intake of carotenoids (average values by the Brazilian population focusing on beneficiaries of the 'Bolsa Família' Program and identify the dietary sources, according to the purpose and degree of processing and the inclusion of food additives. The database used is the personal food consumption module of the Household Budget Survey of 2008-2009, conducted by the Brazilian Institute of Geography and Statistics. The content of carotenoids in foods was obtained primarily from a National data source. Food products were classified into three categories: 1 fresh and minimally processed foods; 2 processed foods (containing food additives, except for flavoring and coloring agents; and 3 highly processed foods (containing flavoring and coloring agents. Insufficient intakes were identified for the conditional cash transfer program beneficiaries (3,547.1 µg. Fresh and minimally processed foods supplied between 48.6% (for girls and 65.7% (for male adults of pro-vitamin carotenoids. Processed foods were sources of between 55.5% and 57.0% of lutein + zeaxanthin for elderly and between 58.0% and 67.8% of lycopene for adults. Highly processed foods contributed to less than 5.0% of total carotenoids.

  13. Bolsa Família e voto na eleição presidencial de 2006: em busca do elo perdido

    Directory of Open Access Journals (Sweden)

    Elaine Cristina Licio

    2009-06-01

    Full Text Available O presente artigo analisa o impacto de ser beneficiário do Programa Bolsa Família do governo federal na decisão de voto na eleição de 2006 e na avaliação atual do Presidente Lula da Silva e contribui para a crescente literatura que explora o impacto desse programa na distribuição de voto em Lula. Contudo, diferentemente de outros estudos, são analisados aqui dados ao nível individual, testando um modelo estatístico multivariado em uma amostra probabilística nacional usando o Barômetro das Américas de 2008. Os resultados indicam um forte impacto de ser beneficiário do programa no voto em Lula e em avaliações positivas de seu desempenho.This article explores the impact of being a Family Grant Program beneficiary in vote choice for President in the 2006 elections and in Lula da Silva's government evaluations. Therefore, the article contributes to the growing literature on how social programs affect voting behaviour in Brazil. However, differently from all other studies, we use individual level data from the AmericasBarometer 2008 Brazilian round, and multivariate statistical analysis to test our hypotheses. Results indicate that being a recipient of the Family Grant Program positively affects vote for Lula and his administration's evaluations.

  14. As contribuições do Programa Institucional de Bolsas de Iniciação à Docência para a formação docente

    Directory of Open Access Journals (Sweden)

    Gleicy Calhau Gomes

    2012-12-01

    Full Text Available Este artigo trata da formação docente para o ensino fundamental e tem por objetivo investigar as contribuições e desafios do Programa Institucional de Bolsas de Iniciação à Docência (PIBID. Realizou-se a pesquisa à partir da metodologia de pesquisa qualitativa segundo a perspectiva fenomenológica, com enfoque na pesquisa-ação. Dentre os sujeitos pesquisados, os principais foram os bolsistas e egressos do PIBID de Pedagogia da UNEMAT- campus Universitário de Sinop-MT. Conclui-se que a formação dos acadêmicos/bolsistas, e a parceria entre universidade/escola, contribui com as práticas educativas idealizadas na escola pública, e com uma formação de mais qualidade para estes bolsistas. Palavras-chave: educação; formação docente; PIBID; práticas educativas; pesquisa-ação. 

  15. Perfil socioeconômico, nutricional e de ingestão alimentar de beneficiários do Programa Bolsa Família

    Directory of Open Access Journals (Sweden)

    Marcela Jardim Cabral

    2013-01-01

    Full Text Available Foram estudados beneficiários do Programa Bolsa Família de Maceió (AL e encontrada alta prevalência de desnutrição nas crianças (18% e adolescentes (20%; mas excesso de peso nos adultos (51%. As mulheres beneficiárias tiveram quatro vezes mais chance de ter obesidade abdominal em relação aos outros adultos. A maioria das famílias (92% apresentou Insegurança Alimentar (IA, sendo em 33% grave. Houve associação entre IA e maior número de pessoas na casa e desemprego. Entre as obesas houve aumento no consumo de alimentos ricos em carboidratos e lipídios em relação à outra população não beneficiária. Encontrou-se ingestão inadequada de cálcio, folato, vitamina E, magnésio, vitamina C, zinco, riboflavina, tiamina e fibra. Esses achados demonstram a necessidade de ações integradas entre políticas de educação/saúde e os programas de transferência de renda.

  16. Surgical treatment of familial adenomatous polyposis: ileoretal anastomosis or restorative proctolectomy? Tratamento cirúrgico da polipose adenomatosa familiar: anastomose íleo-retal ou bolsa ileal?

    Directory of Open Access Journals (Sweden)

    Fábio Guilherme Campos

    2009-12-01

    (clinical, endoscopic, genetic indicate that the best choice for operative treatment should be based on individual features discussed by a specialist; 5. all patients require continuous and long-term surveillance during postoperative follow-up.CONTEXTO: As controvérsias quanto a melhor forma de tratamento da polipose adenomatosa familiar confrontam a morbidade da proctocolectomia restauradora contra a suposta mortalidade decorrente de câncer retal após íleo-reto anastomose. OBJETIVOS: Avaliar as complicações operatórias e a evolução oncológica dos pacientes submetidos a íleo-reto anastomose ou proctocolectomia restauradora. MÉTODOS: Analisaram-se os dados dos doentes tratados entre 1977 e 2006, procedendo ao levantamento de dados clínicos gerais, endoscópicos, resultados do tratamento cirúrgico, dados anatomopatológicos e informações sobre a evolução precoce e tardia dos pacientes. RESULTADOS: Foram tratados 88 pacientes, sendo 41 homens (46,6% e 47 mulheres (53,4%. Por ocasião do diagnóstico, 53 pacientes (60,2% já tinham câncer colorretal associado à polipose. Registraram-se complicações operatórias em 25 doentes (29,0 % dentre os 86 operados, sendo 17 (19,7% precoces e 8 (9,3% tardias. Houve mais complicações após proctocolectomia restauradora (48,1% em comparação às proctocolectomias com ileostomia (26,6% e íleo-reto anastomose (19,0% (P = 0,03. Não houve mortalidade operatória. O risco cumulativo de câncer retal após íleo-reto anastomose foi de 17,2% após 5 anos, 24,1% após 10 anos e 43,1% após 15 anos de seguimento pós-operatório. Já o risco cumulativo idade-dependente começou a existir a partir de 30 anos (4,3%, passando para 9,6% aos 40 anos, 20,9% aos 40 anos e 52% aos 60 anos. Entre os pacientes submetidos a bolsa ileal com seguimento (26, apenas 1 doente (3,8% desenvolveu câncer na bolsa ileal. CONCLUSÕES: 1. Ocorreram complicações operatórias em cerca de 1/3 dos pacientes, sendo mais frequentes após a confec

  17. Estratégias de Investimento em Bolsa de Valores: Uma Pesquisa Exploratória da Visão Fundamentalista de Benjamin Graham

    Directory of Open Access Journals (Sweden)

    Vinicius de Castro Scottá dos Passos

    2010-11-01

    Full Text Available

    Investimentos em bolsa de valores têm sido associados às incertezas e grandes riscos, quando na verdade existem teorias que podem ser assimiladas por qualquer pessoa que deseje diversificar seus investimentos. Estudar as ferramentas de análise de mercado de ações e as estratégias utilizadas por célebres investidores pode oferecer preciosas orientações de como devemos nos preparar psicologicamente e tecnicamente para operar no mercado de ações. O cenário globalizado favorece o fluxo de informação, mas, ainda assim, existe a assimetria informacional do mercado. A análise fundamentalista tem sido forte aliada do mercado de capitais e tem em Benjamin Graham um de seus principais expoentes. Este artigo versará sobre as teorias de Graham, buscando a aplicabilidade de tais premissas na realidade brasileira. A realização da pesquisa poderá ser mais um passo no aprendizado de variáveis que se correlacionam com o mercado bursátil, contribuindo para futuros investidores.

  18. Estratégias de Investimento em Bolsa de Valores: Uma Pesquisa Exploratória da Visão Fundamentalista de Benjamin Graham

    Directory of Open Access Journals (Sweden)

    Vinicius de Castro Scottá dos Passos

    2010-11-01

    Full Text Available Investimentos em bolsa de valores têm sido associados às incertezas e grandes riscos, quando na verdade existem teorias que podem ser assimiladas por qualquer pessoa que deseje diversificar seus investimentos. Estudar as ferramentas de análise de mercado de ações e as estratégias utilizadas por célebres investidores pode oferecer preciosas orientações de como devemos nos preparar psicologicamente e tecnicamente para operar no mercado de ações. O cenário globalizado favorece o fluxo de informação, mas, ainda assim, existe a assimetria informacional do mercado. A análise fundamentalista tem sido forte aliada do mercado de capitais e tem em Benjamin Graham um de seus principais expoentes. Este artigo versará sobre as teorias de Graham, buscando a aplicabilidade de tais premissas na realidade brasileira. A realização da pesquisa poderá ser mais um passo no aprendizado de variáveis que se correlacionam com o mercado bursátil, contribuindo para futuros investidores.

  19. Síndrome de la orina morada en bolsa en paciente anciana con suplementos nutricionales Purple urine bag syndrome in elderly woman with nutritional supplements

    Directory of Open Access Journals (Sweden)

    A. R. Domínguez Alegría

    2012-12-01

    Full Text Available El síndrome de la orina morada en bolsa es una entidad poco frecuente que afecta característicamente a mujeres de edad avanzada con sondaje vesical prolongado y debilitadas por enfermedades crónicas. La presencia de patología urológica previa, el encamamiento prolongado y el estreñimiento crónico son factores predisponentes. El color morado de la orina se debe a la presencia de elevadas concentraciones de bacterias con actividad indoxilsulfatasa/fosfatasa que se desarrollan en un ambiente alcalino en presencia de otros factores. En el caso que presentamos la administración de suplementos nutricionales ricos en triptófano tuvieron un papel relevante en la generación de este síndrome.The purple urine bag syndrome is a rare entity which typically affects elderly women with prolonged urinary catheterization and weakening chronic diseases. Other predisposing factors are previous urologic pathology, immobility syndrome and chronic constipation. The purple color is due to the presence of high loads of bacteria with sulphatase - phosphatase activity which develop in an alkaline environment as well as the presence of other factors. In the case we present the administration of nutritional supplements containing tryptophan conditioned the generation of this syndrome.

  20. Divulgación de información sobre el capital intelectual de empresas nacionales que cotizan en la Bolsa Mexicana de Valores

    Directory of Open Access Journals (Sweden)

    Ruth Leticia Hidalgo Gallardo

    2009-01-01

    Full Text Available Con la nueva visión económica se reconoce al capital intelectual como una herramienta de creación de valor para las empresas que buscan una mayor competitividad en el mercado. En este trabajo se analiza la divulgación que en materia de intangibles llevan a cabo las empresas mexicanas, así como los factores que motivan tal divulgación; para ello, se analizaron los reportes de los anuales de cien empresas que cotizan en la Bolsa Mexicana de Valores. Los resultados reflejaron que para las empresas mexicanas es más importante la divulgación de información del capital estructural, seguido del capital relacional y posteriormente del capital humano; el tamaño de la empresa es el factor clave de la divulgación. De igual forma, se encontró que las empresas de los sectores: industrial, de alimentos y bebidas, y construcción e inmobiliaria son proactivos en el momento de divulgar información sobre intangibles.

  1. Análisis de series de tiempo para la predicción de los precios de la energía en la bolsa de Colombia

    Directory of Open Access Journals (Sweden)

    Cano Cano Jovan Alfonso

    2008-08-01

    Full Text Available Debido a la reestructuración del sector eléctrico colombiano,
    durante las dos últimas décadas, el comportamiento del precio de la
    energía eléctrica ha incrementado su volatilidad, reflejando el
    riesgo existente para los diferentes agentes que intervienen en el
    mercado. El objetivo de este artículo es presentar una metodología
    para la implementación de modelos de regresión, sobre la serie
    histórica de precios de bolsa de energía en Colombia. A medida que
    la cantidad de datos aumente, podrán desarrollarse modelos más
    amplios, que describan de forma adecuada comportamientos del
    mercado, que empleando las técnicas y la información disponible
    actualmente, no es posible identificar.

  2. Os custos eleitorais do Bolsa Família: reavaliando seu impacto sobre a eleição presidencial de 2006

    Directory of Open Access Journals (Sweden)

    Diego Sanches Corrêa

    2015-12-01

    Full Text Available O padrão geográfico da flutuação da votação de Lula entre as eleições presidenciais de 2002 e 2006 é um dos mais intrigantes fenômenos políticos da história recente brasileira. Diversos estudos mostram que o programa Bolsa Família aumentou consideravelmente o apoio a Lula entre os pobres, tendo um papel determinante nos resultados da eleição de 2006. Neste artigo, eu demonstro com base em um banco de dados municipais e técnicas de econometria espacial que seu desempenho eleitoral também se associa negativamente à proporção de ricos. Meu argumento é de que o programa explica ambos os efeitos: os pobres responderam às melhorias em suas condições materiais de vida e os ricos aos custos de oportunidade de investimentos públicos que não lhes beneficiaram diretamente.

  3. [The "Bolsa Família" family grant scheme: the interface between professional practice and the human right to adequate food and nutrition].

    Science.gov (United States)

    Ramos, Camila Irigonhé; Cuervo, Maria Rita Macedo

    2012-08-01

    The Human Right to Adequate Nutrition must be ensured through the public policies included in SAN, namely the Food and Nutritional Security campaign. Besides the income transfer geared to ensuring access to basic social rights, the "Bolsa Família" Program (PBF) is included in this context. This study seeks to analyze the operational aspects of the PBF and also ascertain whether or not the health professionals see the program as a core element of the SAN public policy. With this in mind, semi-structured interviews were conducted with primary healthcare workers involved directly both with the PBF and with the families who receive this benefit. By the end of the study, it was possible to perceive the importance of training health professionals who work in this area, because when one dissociates the social reality in which the beneficiaries live from the program objectives, this can lead to the simple mechanization of these practices. In this respect, it should be stressed that health professionals need to understand the proposals of the program as political and social strategies which, in addition to providing immediate relief, strive to overcome the problems related to poverty and hunger.

  4. Impacto do Programa “Bolsa Família” sobre a qualidade da dieta das famílias de Pernambuco no Brasil

    Directory of Open Access Journals (Sweden)

    Pedro Lima Coelho

    Full Text Available Resumo Este artigo analisa o impacto do Programa Bolsa Família (PBF sobre a qualidade da dieta dos domicílios do estado de Pernambuco utilizando dados da Pesquisa de Orçamento Familiar (POF-IBGE entre 2008-2009. O método Propensity Score Matching, que corrige o viés de seleção amostral, foi utilizado para realizar a comparação entre as famílias beneficiárias e as não beneficiárias do Programa. Os resultados mostram que o valor médio do Índice de Qualidade da Dieta (IQD para as famílias beneficiárias do Programa supera em 9,05 o valor médio do IQD das famílias não participantes do PBF. Os resultados corroboram a eficácia do PBF em elevar a qualidade da dieta das famílias, principalmente quanto à redução de gordura e sódio, e aumento da variedade.

  5. SNTP program reactor design

    Science.gov (United States)

    Walton, Lewis A.; Sapyta, Joseph J.

    1993-06-01

    The Space Nuclear Thermal Propulsion (SNTP) program is evaluating the feasibility of a particle bed reactor for a high-performance nuclear thermal rocket engine. Reactors operating between 500 MW and 2,000 MW will produce engine thrusts ranging from 20,000 pounds to 80,000 pounds. The optimum reactor arrangement depends on the power level desired and the intended application. The key components of the reactor have been developed and are being tested. Flow-to-power matching considerations dominate the thermal-hydraulic design of the reactor. Optimal propellant management during decay heat cooling requires a three-pronged approach. Adequate computational methods exist to perform the neutronics analysis of the reactor core. These methods have been benchmarked to critical experiment data.

  6. Fast Spectrum Reactors

    CERN Document Server

    Todd, Donald; Tsvetkov, Pavel

    2012-01-01

    Fast Spectrum Reactors presents a detailed overview of world-wide technology contributing to the development of fast spectrum reactors. With a unique focus on the capabilities of fast spectrum reactors to address nuclear waste transmutation issues, in addition to the well-known capabilities of breeding new fuel, this volume describes how fast spectrum reactors contribute to the wide application of nuclear power systems to serve the global nuclear renaissance while minimizing nuclear proliferation concerns. Readers will find an introduction to the sustainable development of nuclear energy and the role of fast reactors, in addition to an economic analysis of nuclear reactors. A section devoted to neutronics offers the current trends in nuclear design, such as performance parameters and the optimization of advanced power systems. The latest findings on fuel management, partitioning and transmutation include the physics, efficiency and strategies of transmutation, homogeneous and heterogeneous recycling, in addit...

  7. Hybrid reactors. [Fuel cycle

    Energy Technology Data Exchange (ETDEWEB)

    Moir, R.W.

    1980-09-09

    The rationale for hybrid fusion-fission reactors is the production of fissile fuel for fission reactors. A new class of reactor, the fission-suppressed hybrid promises unusually good safety features as well as the ability to support 25 light-water reactors of the same nuclear power rating, or even more high-conversion-ratio reactors such as the heavy-water type. One 4000-MW nuclear hybrid can produce 7200 kg of /sup 233/U per year. To obtain good economics, injector efficiency times plasma gain (eta/sub i/Q) should be greater than 2, the wall load should be greater than 1 MW.m/sup -2/, and the hybrid should cost less than 6 times the cost of a light-water reactor. Introduction rates for the fission-suppressed hybrid are usually rapid.

  8. Multi purpose research reactor

    Energy Technology Data Exchange (ETDEWEB)

    Raina, V.K. [Research Reactor Design and Projects Division, Bhabha Atomic Research Centre, Mumbai 400085 (India)]. E-mail: vkrain@magnum.barc.ernet.in; Sasidharan, K. [Research Reactor Design and Projects Division, Bhabha Atomic Research Centre, Mumbai 400085 (India); Sengupta, Samiran [Research Reactor Design and Projects Division, Bhabha Atomic Research Centre, Mumbai 400085 (India); Singh, Tej [Research Reactor Services Division, Bhabha Atomic Research Centre, Mumbai 400085 (India)

    2006-04-15

    At present Dhruva and Cirus reactors provide the majority of research reactor based facilities to cater to the various needs of a vast pool of researchers in the field of material sciences, physics, chemistry, bio sciences, research and development work for nuclear power plants and production of radio isotopes. With a view to further consolidate and expand the scope of research and development in nuclear and allied sciences, a new 20 MWt multi purpose research reactor is being designed. This paper describes some of the design features and safety aspects of this reactor.

  9. INVAP's Research Reactor Designs

    Directory of Open Access Journals (Sweden)

    Eduardo Villarino

    2011-01-01

    Full Text Available INVAP, an Argentine company founded more than three decades ago, is today recognized as one of the leaders within the research reactor industry. INVAP has participated in several projects covering a wide range of facilities, designed in accordance with the requirements of our different clients. For complying with these requirements, INVAP developed special skills and capabilities to deal with different fuel assemblies, different core cooling systems, and different reactor layouts. This paper summarizes the general features and utilization of several INVAP research reactor designs, from subcritical and critical assemblies to high-power reactors.

  10. LMFBR type reactor

    Energy Technology Data Exchange (ETDEWEB)

    Kanbe, Mitsuru

    1997-04-04

    An LMFBR type reactor comprises a plurality of reactor cores in a reactor container. Namely, a plurality of pot containing vessels are disposed in the reactor vessel and a plurality of reactor cores are formed in a state where an integrated-type fuel assembly is each inserted to a pot, and a coolant pipeline is connected to each of the pot containing-vessel to cool the reactor core respectively. When fuels are exchanged, the integrated-type fuel assembly is taken out together with the pot from the reactor vessel in a state where the integrated-type fuel assembly is immersed in the coolants in the pot as it is. Accordingly, coolants are supplied to each of the pot containing-vessel connected with the coolant pipeline and circulate while cooling the integrated-type fuel assembly for every pot. Then, when the fuels are exchanged, the integrated type fuel assembly is taken out to the outside of the reactor together with the pot by taking up the pot from the pot-containing vessel. Then, neutron economy is improved to thereby improve reactor power and the breeding ratio. (N.H.)

  11. Light water reactor program

    Energy Technology Data Exchange (ETDEWEB)

    Franks, S.M.

    1994-12-31

    The US Department of Energy`s Light Water Reactor Program is outlined. The scope of the program consists of: design certification of evolutionary plants; design, development, and design certification of simplified passive plants; first-of-a-kind engineering to achieve commercial standardization; plant lifetime improvement; and advanced reactor severe accident program. These program activities of the Office of Nuclear Energy are discussed.

  12. Space Nuclear Reactor Engineering

    Energy Technology Data Exchange (ETDEWEB)

    Poston, David Irvin [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2017-03-06

    We needed to find a space reactor concept that could be attractive to NASA for flight and proven with a rapid turnaround, low-cost nuclear test. Heat-pipe-cooled reactors coupled to Stirling engines long identified as the easiest path to near-term, low-cost concept.

  13. Reactor Materials Research

    Energy Technology Data Exchange (ETDEWEB)

    Van Walle, E

    2001-04-01

    The activities of the Reactor Materials Research Department of the Belgian Nuclear Research Centre SCK-CEN in 2000 are summarised. The programmes within the department are focussed on studies concerning (1) fusion, in particular mechanical testing; (2) Irradiation Assisted Stress Corrosion Cracking (IASCC); (3) nuclear fuel; and (4) Reactor Pressure Vessel Steel (RPVS)

  14. Nuclear reactor design

    CERN Document Server

    2014-01-01

    This book focuses on core design and methods for design and analysis. It is based on advances made in nuclear power utilization and computational methods over the past 40 years, covering core design of boiling water reactors and pressurized water reactors, as well as fast reactors and high-temperature gas-cooled reactors. The objectives of this book are to help graduate and advanced undergraduate students to understand core design and analysis, and to serve as a background reference for engineers actively working in light water reactors. Methodologies for core design and analysis, together with physical descriptions, are emphasized. The book also covers coupled thermal hydraulic core calculations, plant dynamics, and safety analysis, allowing readers to understand core design in relation to plant control and safety.

  15. Status of French reactors

    Energy Technology Data Exchange (ETDEWEB)

    Ballagny, A. [Commissariat a l`Energie Atomique, Saclay (France)

    1997-08-01

    The status of French reactors is reviewed. The ORPHEE and RHF reactors can not be operated with a LEU fuel which would be limited to 4.8 g U/cm{sup 3}. The OSIRIS reactor has already been converted to LEU. It will use U{sub 3}Si{sub 2} as soon as its present stock of UO{sub 2} fuel is used up, at the end of 1994. The decision to close down the SILOE reactor in the near future is not propitious for the start of a conversion process. The REX 2000 reactor, which is expected to be commissioned in 2005, will use LEU (except if the fast neutrons core option is selected). Concerning the end of the HEU fuel cycle, the best option is reprocessing followed by conversion of the reprocessed uranium to LEU.

  16. Estado nutricional dos beneficiários do Programa Bolsa Família no Brasil - uma revisão sistemática

    Directory of Open Access Journals (Sweden)

    Miriam Regina Wolf

    2014-05-01

    Full Text Available Diversos programas de combate à desnutrição foram implementados ao longo dos anos no Brasil. A partir de 2001 cabe ao Programa Bolsa Família (PBF esta responsabilidade. Apesar da expansão do PBF ainda são pouca as avaliações que aquilatam os avanços e os desafios a serem enfrentados, bem como os impactos nas condições de saúde e nutrição da população. Ainda que o acompanhamento do estado nutricional seja uma das condicionalidades para a manutenção do recebimento do benefício, quando se buscam estes dados, há uma grande dificuldade em obtê-los. O objetivo desta revisão sistemática é obter informações do estado nutricional dos beneficiários do PBF, para conhecer a realidade nacional no que diz respeito a esta situação, bem como avaliar se o programa causou impacto sobre o perfil nutricional da população atendida. Foi realizada uma busca através da Medline, Bireme, Scielo, Lilacs, Sistema de Bibliotecas Universitárias (SBU e ferramenta Google. A busca inclui artigos originais e teses de março 2002 até maio de 2012. Encontrou-se aproximadamente 100 trabalhos. Após a exclusão pelo título restaram 23 artigos e após a leitura dos resumos, ficaram 13. Os trabalhos revisados sugererem que o Programa não está modificando o estado nutricional dos beneficiários.

  17. Análisis de portafolio por sectores mediante el uso de algoritmos genéticos: caso aplicado a la Bolsa Mexicana de Valores

    Directory of Open Access Journals (Sweden)

    Martha del Pilar Rodríguez García

    2015-01-01

    Full Text Available El tipo de sector, el tamaño de la empresa, el número de trabajadores, etc. son variables que se consideran de control en una gran cantidad de publicaciones. En este trabajo consideramos estudiar la variable sector —más que como una variable de control— como una variable determinante del desempeño financiero (Baird et al. 2012 y del riesgo (Artikis y Nifora, 2011. Así, se analiza seis sectores de la economía mexicana divididos de acuerdo con la Bolsa Mexicana de Valores en Industrial, Productos de consumo básico, Materiales, Productos de consumo no básico, Telecomunicaciones y Servicios financieros. La muestra se compone de 30 empresas mexicanas dentro del periodo de 2007-2012. Para medir el desempeño del portafolio se utilizan dos indicadores clásicos: (1 Alfa de Jensen y (2 Ratio de Sharpe; se utiliza una métrica condicional que mide el número de veces que el rendimiento del portafolio supera el rendimiento promedio del mercado. El objetivo es encontrar un portafolio que maximice estos parámetros y comparar los resultados entre los diferentes sectores bajo estudio. Debido a un problema de programación no lineal, se utilizan algoritmos genéticos para obtener el portafolio óptimo que maximice estas métricas. Los resultados muestran un mejor desempeño financiero ajustado a riesgo en el sector de Materiales y Servicios financieros y un desempeño más bajo en sectores como el Industrial y el de Telecomunicaciones.

  18. Bolsa Família: insegurança alimentar e nutricional de crianças menores de cinco anos

    Directory of Open Access Journals (Sweden)

    Flávia Monteiro

    2014-05-01

    Full Text Available Estudo transversal descritivo de base populacional realizado no município de Colombo (PR. Os objetivos foram identificar a prevalência de insegurança alimentar das famílias beneficiárias do Programa Bolsa Família e os fatores relacionados a essa condição, bem como descrever o estado nutricional das crianças menores de cinco anos. As análises de associação foram realizadas por meio do teste exato de Fischer. A amostra incluiu 442 famílias, das quais 168 com menores de cinco anos em sua constituição. Para avaliação da insegurança alimentar foi aplicada a Escala Brasileira de Insegurança Alimentar e o estado nutricional das 199 crianças avaliadas foi determinado pelos índices estatura para idade, peso para idade e índice de massa corporal para idade, de acordo com os valores de referência da OMS 2006. A prevalência de insegurança alimentar foi de 81,6%. O excesso de peso e o déficit estatural entre as crianças coexistiram. A insegurança alimentar apresentou-se associada ao índice estatura para idade entre crianças menores de dois anos. A renda familiar per capita e as dívidas alimentares influenciaram significativamente a situação de insegurança alimentar familiar.

  19. Evaluación de la terapia mecánica periodontal en bolsas profundas: Respuesta clínica y bacteriológica Evaluation of periodontal mechanical therapy in deep pockets: Clinical and bacteriological response

    OpenAIRE

    Bazzano, G.; Parodi, R.; Tabares, S; Sembaj,A

    2012-01-01

    Objetivos: Evaluar la composición microbiológica y los parámetros clínicos de bolsas periodontales ≥5 mm de profundidad al inicio, 1 semana, 3 y 12 meses post raspado y alisado radicular. Materiales y Métodos: Se tomaron registros clínicos y muestras de placa subgingival de 44 sitios de pacientes con diagnóstico de periodontitis crónica. Se identificaron por técnica de Reacción en Cadena de la Polimerasa (PCR) patógenos putativos periodontales: Aggregatibacter actinomycetemcomitans (Aa)...

  20. Salário mínimo, Bolsa Família e desempenho relativo recente da economia do Nordeste Minimum wages, poverty alleviation income policies, and the relative performance of the Northeastern economy in Brazil

    Directory of Open Access Journals (Sweden)

    Alexandre Rands Barros

    2013-03-01

    Full Text Available This paper presents the two major hypotheses explaining the relatively higher GDP growth of Northeast, when compared to the one for the whole country. These hypotheses are that governmental transferences towards the poorest and the rises in minimum wages are responsible for such relative performance. They are formally presented theoretically and a method to test their relative role is developed, relying on county data for the period 2000 to 2006. The results indicate that the Bolsa Familia Program had a higher positive impact in the GDP growth rate of the region than the rises in Minimum wage.

  1. Embolia gasosa venosa inadvertida durante cesariana: bolsas retráteis ​​para líquidos intravenosos sem saídas autovedantes oferecem riscos. Relato de caso

    OpenAIRE

    Bakan,Mefkur; Topuz,Ufuk; Esen, Asim; Basaranoglu,Gokcen; Ozturk, Erdogan

    2013-01-01

    O anestesiologista deve estar ciente das causas, do diagnóstico e do tratamento de embolia venosa e adotar padrões de prática para prevenir sua ocorrência. Embora a embolia gasosa seja uma complicação conhecida da cesariana, descrevemos um caso raro de desatenção que causou embolia gasosa iatrogênica quase fatal durante uma cesariana sob raquianestesia. uma das razões para o uso de bolsas autorretráteis para infusão em vez dos frascos convencionais de vidro ou plástico é a precaução contra em...

  2. Tratamiento de residuos de equipos de venoclisis, bolsas tipo viaflex y guantes quirúrgicos dentro del marco de la producción más limpia (PML) como contribución al desarrollo sostenible empresarial

    OpenAIRE

    Sánchez Calderón, Adolfo León

    2010-01-01

    Tesis (Maestría en Desarrollo Sostenible y Medio Ambiente). Universidad de Manizales. Facultad de Ciencias Contables Económicas y Administrativas, 2010 El presente trabajo de investigación pretendió evaluar desde el punto de vista de la producción más limpia y del desarrollo sostenible, el aprovechamiento o reciclaje de residuos hospitalarios conformados por equipos de venoclisis, guantes quirúrgicos y bolsas tipo viaflex. Para tal efecto se estimó la cantidad de este tipo de residuos g...

  3. La política de dividendos como fuente de creación de valor para la empresa : [análisis de las tendencias seguidas por las principales empresas cotizadas en la Bolsa de Madrid (1988-1998)

    OpenAIRE

    Priede Bergamini, Tiziana

    2000-01-01

    Este trabajo pretende analizar las diversas formas de retribución al accionista que han seguido algunas de las empresas que cotizan en la Bolsa de Madrid durante los últimos diez años, con el fin de describir detalladamente su trayectoria, resaltar su relevancia y justificar un posible cambio de tendencia, pasando de la vía tradicional de retribución mediante dividendos líquidos a otras formas alternativas como las devoluciones de parte del nominal o la entrega de acciones liberadas, benefici...

  4. A bolsa na mediação "estar ostomizado" - "estar profissional": análise de uma estratégia pedagógica La bolsa como mediadora entre "estar ostomizado" y "estar profesional": análisis de una estratégia pedagógica The pouch mediating the relation between "being an ostomized person" and "being professional": analysis of a pedagogic strategy

    Directory of Open Access Journals (Sweden)

    Vera Lúcia Conceição de Gouveia Santos

    2000-07-01

    Full Text Available Este estudo analisou a (reconstrução das significações sobre a ostomia, o ostomizado, o cuidar em enfermagem e o papel profissional de 30 enfermeiros que utilizaram bolsa coletora, em experiência pedagógica, durante os Cursos de Estomaterapia. A análise dos depoimentos revelou dois grandes eixos discursivos: "estar ostomizado" e "estar profissional". O enfermeiro, tendo por mediação o uso da bolsa coletora, vivencia o "estar ostomizado" por meio de violações da identidade e qualidade de vida, perpassadas por transformações desde papéis às relações com o outro. A mobilização de conteúdos simbólicos e afetivos acerca do "estar ostomizado" gera uma crise de significação do "estar profissional", até então caracterizado por um cuidar fragmentado. Re-conhecendo o cuidar passado como um fazer técnico voltado principalmente para a ostomia-bolsa, o aluno-enfermeiro projeta um cuidar futuro mais holístico do ser humano portador de uma ostomia, incorporando as dimensões afetivas, simbólicas e relacionais.El estudio es acerca de la (reconstrucción de los significados sobre el estoma, el ostomizado, el cuidado de enfermería y el rol profesional, hecha por 30 enfermeros que usaran bolsas de drenaje, como una estrategia pedagógica en los Cursos de Terapia Enterostomal. El análisis de los discursos reveló dos grandes categorias: "estar ostomizado" y "estar profesional". El enfermero, teniendo por mediación la bolsa, vive el "estar ostomizado" con sentimientos de transgresión de la identidad, de la calidad de vida, cambios de roles y de sus relaciones sociales. La movilización de los contenidos simbólicos y afectivos acerca del "estar ostomizado" resulta en una crisis de significado del "estar profesional" caracterizado por el cuidar fragmentado. Reconociendo el cuidar pasado como un hacer técnico dirigido principalmente para el estoma-bolsa, el enfermero proyecta un cuidar futuro del ostomizado más humanizado, agregando

  5. Slurry reactor design studies

    Energy Technology Data Exchange (ETDEWEB)

    Fox, J.M.; Degen, B.D.; Cady, G.; Deslate, F.D.; Summers, R.L. (Bechtel Group, Inc., San Francisco, CA (USA)); Akgerman, A. (Texas A and M Univ., College Station, TX (USA)); Smith, J.M. (California Univ., Davis, CA (USA))

    1990-06-01

    The objective of these studies was to perform a realistic evaluation of the relative costs of tublar-fixed-bed and slurry reactors for methanol, mixed alcohols and Fischer-Tropsch syntheses under conditions where they would realistically be expected to operate. The slurry Fischer-Tropsch reactor was, therefore, operated at low H{sub 2}/CO ratio on gas directly from a Shell gasifier. The fixed-bed reactor was operated on 2.0 H{sub 2}/CO ratio gas after adjustment by shift and CO{sub 2} removal. Every attempt was made to give each reactor the benefit of its optimum design condition and correlations were developed to extend the models beyond the range of the experimental pilot plant data. For the methanol design, comparisons were made for a recycle plant with high methanol yield, this being the standard design condition. It is recognized that this is not necessarily the optimum application for the slurry reactor, which is being proposed for a once-through operation, coproducing methanol and power. Consideration is also given to the applicability of the slurry reactor to mixed alcohols, based on conditions provided by Lurgi for an Octamix{trademark} plant using their standard tubular-fixed reactor technology. 7 figs., 26 tabs.

  6. Gas cooled fast reactor

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1972-06-01

    Although most of the development work on fast breeder reactors has been devoted to the use of liquid metal cooling, interest has been expressed for a number of years in alternative breeder concepts using other coolants. One of a number of concepts in which interest has been retained is the Gas-Cooled Fast Reactor (GCFR). As presently envisioned, it would operate on the uranium-plutonium mixed oxide fuel cycle, similar to that used in the Liquid Metal Fast Breeder Reactor (LMFBR), and would use helium gas as the coolant.

  7. Microfluidic electrochemical reactors

    Science.gov (United States)

    Nuzzo, Ralph G [Champaign, IL; Mitrovski, Svetlana M [Urbana, IL

    2011-03-22

    A microfluidic electrochemical reactor includes an electrode and one or more microfluidic channels on the electrode, where the microfluidic channels are covered with a membrane containing a gas permeable polymer. The distance between the electrode and the membrane is less than 500 micrometers. The microfluidic electrochemical reactor can provide for increased reaction rates in electrochemical reactions using a gaseous reactant, as compared to conventional electrochemical cells. Microfluidic electrochemical reactors can be incorporated into devices for applications such as fuel cells, electrochemical analysis, microfluidic actuation, pH gradient formation.

  8. Fast Breeder Reactor studies

    Energy Technology Data Exchange (ETDEWEB)

    Till, C.E.; Chang, Y.I.; Kittel, J.H.; Fauske, H.K.; Lineberry, M.J.; Stevenson, M.G.; Amundson, P.I.; Dance, K.D.

    1980-07-01

    This report is a compilation of Fast Breeder Reactor (FBR) resource documents prepared to provide the technical basis for the US contribution to the International Nuclear Fuel Cycle Evaluation. The eight separate parts deal with the alternative fast breeder reactor fuel cycles in terms of energy demand, resource base, technical potential and current status, safety, proliferation resistance, deployment, and nuclear safeguards. An Annex compares the cost of decommissioning light-water and fast breeder reactors. Separate abstracts are included for each of the parts.

  9. Reactor BR2. Introduction

    Energy Technology Data Exchange (ETDEWEB)

    Gubel, P

    2001-04-01

    The BR2 is a materials testing reactor and is still one of SCK-CEN's important nuclear facilities. After an extensive refurbishment to compensate for the ageing of the installation, the reactor was restarted in April 1997. During the last three years, the availability of the installation was maintained at an average level of 97.6 percent. In the year 2000, the reactor was operated for a total of 104 days at a mean power of 56 MW. In 2000, most irradiation experiments were performed in the CALLISTO PWR loop. The report describes irradiations achieved or under preparation in 2000, including the development of advanced facilities and concept studies for new programmes. An overview of the scientific irradiation programmes as well as of the R and D programme of the BR2 reactor in 2000 is given.

  10. Reactor Neutrino Spectra

    CERN Document Server

    Hayes, A C

    2016-01-01

    We present a review of the antineutrino spectra emitted from reactors. Knowledge of these and their associated uncertainties are crucial for neutrino oscillation studies. The spectra used to-date have been determined by either conversion of measured electron spectra to antineutrino spectra or by summing over all of the thousands of transitions that makeup the spectra using modern databases as input. The uncertainties in the subdominant corrections to beta-decay plague both methods, and we provide estimates of these uncertainties. Improving on current knowledge of the antineutrino spectra from reactors will require new experiments. Such experiments would also address the so-called reactor neutrino anomaly and the possible origin of the shoulder observed in the antineutrino spectra measured in recent high-statistics reactor neutrino experiments.

  11. New reactor type proposed

    CERN Multimedia

    2003-01-01

    "Russian scientists at the Research Institute of Nuclear Power Engineering in Moscow are hoping to develop a new reactor that will use lead and bismuth as fuel instead of uranium and plutonium" (1/2 page).

  12. Helias reactor studies

    Energy Technology Data Exchange (ETDEWEB)

    Beidler, C.D. [Max-Planck-Institut fuer Plasmaphysik, Garching (Germany); Grieger, G. [Max-Planck-Institut fuer Plasmaphysik, Garching (Germany); Harmeyer, E. [Max-Planck-Institut fuer Plasmaphysik, Garching (Germany); Kisslinger, J. [Max-Planck-Institut fuer Plasmaphysik, Garching (Germany); Karulin, N. [Nuclear Fusion Institute, Moscow (Russian Federation); Maurer, W. [Forschungszentrum Karlsruhe GmbH Technik und Umwelt (Germany); Nuehrenberg, J. [Max-Planck-Institut fuer Plasmaphysik, Garching (Germany); Rau, F. [Max-Planck-Institut fuer Plasmaphysik, Garching (Germany); Sapper, J. [Max-Planck-Institut fuer Plasmaphysik, Garching (Germany); Wobig, H. [Max-Planck-Institut fuer Plasmaphysik, Garching (Germany)

    1995-10-01

    The present status of Helias reactor studies is characterised by the identification and investigation of specific issues which result from the particular properties of this type of stellarator. On the technical side these are issues related to the coil system, while physics studies have concentrated on confinement, alpha-particle behaviour and ignition conditions. The usual assumptions have been made in those fields which are common to all toroidal fusion reactors: blanket and shield, refuelling and exhaust, safety and economic aspects. For blanket and shield sufficient space has been provided, a detailed concept will be developed in future. To date more emphasis has been placed on scoping and parameter studies as opposed to fixing a specific set of parameters and providing a detailed point study. One result of the Helias reactor studies is that physical dimensions are on the same order as those of tokamak reactors. However, it should be noticed that this comparison is difficult in view of the large spectrum of tokamak reactors ranging from a small reactor like Aries, to a large device such as SEAFP. The notion that the large aspect ratio of 10 or more in Helias configurations also leads to large reactors is misleading, since the large major radius of 22 m is compensated by the average plasma radius of 1.8 m and the average coil radius of 5 m. The plasma volume of 1400 m{sup 3} is about the same as the ITER reactor and the magnetic energy of the coil system is about the same or even slightly smaller than envisaged in ITER. (orig.)

  13. Future Reactor Experiments

    OpenAIRE

    He, Miao

    2013-01-01

    The measurement of the neutrino mixing angle $\\theta_{13}$ opens a gateway for the next generation experiments to measure the neutrino mass hierarchy and the leptonic CP-violating phase. Future reactor experiments will focus on mass hierarchy determination and the precision measurement of mixing parameters. Mass hierarchy can be determined from the disappearance of reactor electron antineutrinos based on the interference effect of two separated oscillation modes. Relative and absolute measure...

  14. Reactor Neutrino Experiments

    OpenAIRE

    Cao, Jun

    2007-01-01

    Precisely measuring $\\theta_{13}$ is one of the highest priority in neutrino oscillation study. Reactor experiments can cleanly determine $\\theta_{13}$. Past reactor neutrino experiments are reviewed and status of next precision $\\theta_{13}$ experiments are presented. Daya Bay is designed to measure $\\sin^22\\theta_{13}$ to better than 0.01 and Double Chooz and RENO are designed to measure it to 0.02-0.03. All are heading to full operation in 2010. Recent improvements in neutrino moment measu...

  15. Department of Reactor Technology

    DEFF Research Database (Denmark)

    Risø National Laboratory, Roskilde

    The general development of the Department of Reactor Technology at Risø during 1981 is presented, and the activities within the major subject fields are described in some detail. Lists of staff, publications, and computer programs are included.......The general development of the Department of Reactor Technology at Risø during 1981 is presented, and the activities within the major subject fields are described in some detail. Lists of staff, publications, and computer programs are included....

  16. Moon base reactor system

    Science.gov (United States)

    Chavez, H.; Flores, J.; Nguyen, M.; Carsen, K.

    1989-01-01

    The objective of our reactor design is to supply a lunar-based research facility with 20 MW(e). The fundamental layout of this lunar-based system includes the reactor, power conversion devices, and a radiator. The additional aim of this reactor is a longevity of 12 to 15 years. The reactor is a liquid metal fast breeder that has a breeding ratio very close to 1.0. The geometry of the core is cylindrical. The metallic fuel rods are of beryllium oxide enriched with varying degrees of uranium, with a beryllium core reflector. The liquid metal coolant chosen was natural lithium. After the liquid metal coolant leaves the reactor, it goes directly into the power conversion devices. The power conversion devices are Stirling engines. The heated coolant acts as a hot reservoir to the device. It then enters the radiator to be cooled and reenters the Stirling engine acting as a cold reservoir. The engines' operating fluid is helium, a highly conductive gas. These Stirling engines are hermetically sealed. Although natural lithium produces a lower breeding ratio, it does have a larger temperature range than sodium. It is also corrosive to steel. This is why the container material must be carefully chosen. One option is to use an expensive alloy of cerbium and zirconium. The radiator must be made of a highly conductive material whose melting point temperature is not exceeded in the reactor and whose structural strength can withstand meteor showers.

  17. Estructura de capital de las empresas que cotizan en la bolsa de valores chilena Un análisis comparativo basado en la teoría de asimetrías de información

    Directory of Open Access Journals (Sweden)

    Paolo Saona Hoffmann

    2009-01-01

    Full Text Available En este trabajo se estudia la estructura de capital de las empresas que cotizan en la bolsa de valores de Chile, para lo cual se efectúa un análisis comparativo basado en la teoría de asimetrías de información. De acuerdo con esta teoría, las empresas de mejor calidad envían señales al mercado sobre su condición con el propósito de establecer un criterio de separación y diferenciarse de las que tienen una calidad inferior (Akerlof, 1970. Se ha considerado a las empresas pertenecientes al Índice de Precios Selectivo de Acciones (ipsa en el mercado de valores chileno como las que cuentan con menores asimetrías de información y se han comparado con el resto de las empresas que cotizan en la bolsa, pero que no pertenecen al índice, suponiendo que son las que poseen mayores asimetrías de información. Entre los principales hallazgos se encontró que pertenecer al índice implica una reducción en la brecha informativa con el mercado y que la mayor visibilidad de las empresas indexadas les permite acceder más fácilmente a los mercados de deuda.

  18. Staphylococcus spp. in the oral cavity and periodontal pockets of chronic periodontitis patients Staphylococcus spp. na cavidade bucal e na bolsa periodontal de indivíduos com periodontite crônica

    Directory of Open Access Journals (Sweden)

    Jussara Cia S. Loberto

    2004-06-01

    outras infecções pode predispor o aumento do número de Staphylococcus spp. na boca, pois estes adquirem facilmente resistência aos antibióticos, podendo resultar em superinfecção. O objetivo deste estudo foi verificar a presença de Staphylococcus spp. na cavidade bucal e nas bolsas periodontais de pacientes com periodontite crônica; identificar as cepas isoladas; verificar a relação entre a presença de Staphylococcus spp. na cavidade bucal e presença de bolsa periodontal. Participaram deste estudo 88 pacientes, entre 25 e 60 anos de idade e apresentando periodontite crônica, com pelo menos dois sítios com profundidade de sondagem maior ou igual a 5mm. Após anamnese e exame clínico periodontal foram feitas coletas de material da bolsa periodontal com cones de papel e da cavidade bucal por meio de bochechos. Do total de pacientes 37,50% apresentaram Staphylococcus spp. na bolsa periodontal e 61,36% na cavidade bucal, sendo que 27,27% apresentaram a bactéria nos 2 sítios. S. epidermidis foi a espécie mais prevalente para bolsa periodontal (15,9% e cavidade bucal (27,27%. Não houve diferença estatística significante quanto à presença desses microrganismos entre as faixas etárias e aumento da profundidade de sondagem. A presença de bactérias oportunistas na cavidade bucal pode representar dificuldades para a manutenção do tratamento periodontal.

  19. Evaluación del Programa Bolsa Familia en los municipios con bajo Índice de Desarrollo Humano y el cumplimiento de las condicionalidades de la salud.

    Directory of Open Access Journals (Sweden)

    Leonor Maria Pacheco SANTOS

    2011-12-01

    Full Text Available El Programa Bolsa Familia se ha evaluado en las cinco regiones de Brasil en municipios de bajo Índice de Desarrollo Humano. Se realizó análisis de documentos, entrevistas con los directores y los informantes claves, cuestionarios y grupos de discusión con las familias inscritas y no inscritas. El estudio mostró una estructura de marco regulador adecuado y en constante evolución. También evaluando estructura, los recursos humanos, las computadoras y acceso a internet no eran aptos para aplicación del programa. No había Banca en uno de los municipios y las familias se trasladaban para recibir el efectivo en el condado vecino. En términos de procesos hube problemas en registración, control social y las cuotas determinadas por el gobierno federal quedaran insuficientes para el número de familias elegibles. Los resultados mostraran excelente focalización del programa entre las familias estudiadas (99%, pero confirmaran baja cobertura. Datos administrativos habían Revista Tempus Actas de Saúde Coletiva 141 indicado que más del 80% de las familias se inscribieron, esto no se confirmó en el estudio empírico; se encontró 53% de cobertura entre las familias estudiadas, información corroborada por las declaraciones locales. Se recibieron informes sobre la retención ilegal de las tarjetas en los comercios locales como condición para la apertura de un crédito, pero la práctica era aceptada por las mujeres sin problemas. Sólo el 19% de las familias identificó la existencia de condicionalidades de salud y 7.7% reportó saber que deben llevar los niños a la clínica para sean pesados. Algunos gerentes de local, aunque considerando la importancia del programa, tenían en cuenta la transferencia de ingresos como un incentivo para la comodidad y no como un derecho ciudadano. Los resultados indican la importancia de las inversiones para la mejora de la gestión local del programa.

  20. Modelación de la volatilidad y pronóstico del índice general de la bolsa de valores de Colombia (IGBC

    Directory of Open Access Journals (Sweden)

    Edder Parody Camargo

    2014-01-01

    Full Text Available El objetivo de esta investigación es determinar ¿cuál es el modelo que permite explicar con mayor precisión el comportamiento histórico del índice general de la bolsa de valores de Colombia (IGBC, durante el periodo comprendido entre el 01 de enero de 2008 y el 31 de mayo del año 2012?, analizando dicho fenómeno desde la perspectiva teórica del Dow jons y el análisis técnico y empleando la metodología de los modelos de la familia ARCH. Se estudia la volatilidad del mercado, se comparan los modelos ARCH, GARCH, EGARCH y PARCH utilizando los criterios tradicionales de evaluación y concluyendo que el modelo EGARCH (1,1 posee la mejor capacidad para predecir. Finalmente, se identifica como futura línea de investigación, la necesidad de contractar empíricamente la pertinencia de medir la volatilidad del IGBC según las directrices fijadas por la superintendencia financiara colombiana para el cálculo del riesgo de mercado.Palabras clave: ARCH; GARCH; volatilidad; metodología; IGBC.Modelling of the volatility and forecasting the index of the general stock exchange of Colombia (IGBCAbstract This research aims to determine, what is the model that allows to explain more precisely the historical behavior of the general index of the stock exchange of Colombia (IGBC, from the period January 1 2008 to May 31-2012? Analyzing this phenomenon from the theoretical perspective of the Dow Jones and the technical analysis and using the methodology of the ARCH family models. It is studied the market volatility, the ARCH, GARCH, EGARCH and PARCH models are compared using traditional evaluation criteria and it`s concluded that the EGARCH (1, 1 model has the best ability to predict. Finally, it is identified like a future line of research, the need for empirically contracting the relevance of measuring the volatility of the IGBC under the guidelines established by the Colombian financial Superintendence for the calculation of market risk

  1. Programa bolsa família: nova institucionalidade no campo da política social brasileira? The family grant program: new institutionalism in Brazilian social policy

    Directory of Open Access Journals (Sweden)

    Mônica de Castro Maia Senna

    2007-06-01

    Full Text Available O Programa Bolsa Família foi implantado pelo Governo Federal brasileiro em outubro de 2003 com a perspectiva de combater a pobreza e a fome no país e promover inovações no padrão histórico de intervenção pública na área social. Esse artigo analisa o desenho do Programa, buscando identificar possíveis inflexões nele contidas, a partir dos seguintes eixos: foco e condições de acesso, condicionalidades, descentralização, intersetorialidade e controle social. O estudo tomou por referência a legislação e documentos oficiais, apontando limites e potencialidades à sua operacionalização. Dentre as mudanças pretendidas, destaca-se o complexo esforço de ampliação da arena decisória, de forma a incorporar diferentes níveis e esferas governamentais e a sociedade civil. Por outro lado, observam-se limites dados pela restrição dos mecanismos de focalização da clientela e pela indefinição de aspectos relativos ao controle social e à gestão compartilhada. A questão das condicionalidades configura uma polêmica central, merecendo estudos mais aprofundados.The Family Grant Program was established by the Brazilian federal government in October 2003 to fight poverty and hunger and promote innovations in government social intervention. This article analyzes the program's design and tries to identify possible inflections contained within it, based on the following focus: conditions of access, conditionalities, decentralization, intersectoral factors and social control. The study analyzed official documents and legislation, and indicates the limits and potential for their operationalization. The changes planned are highlighted by the complex effort to expand the decision-making arena, in order to incorporate different government levels and spheres as well as civil society. Limitations were noted that were created by the restrictive mechanisms for the focalization of clientele and by the lack of definition of factors related to

  2. Reactor Safety Planning for Prometheus Project, for Naval Reactors Information

    Energy Technology Data Exchange (ETDEWEB)

    P. Delmolino

    2005-05-06

    The purpose of this letter is to submit to Naval Reactors the initial plan for the Prometheus project Reactor Safety work. The Prometheus project is currently developing plans for cold physics experiments and reactor prototype tests. These tests and facilities may require safety analysis and siting support. In addition to the ground facilities, the flight reactor units will require unique analyses to evaluate the risk to the public from normal operations and credible accident conditions. This letter outlines major safety documents that will be submitted with estimated deliverable dates. Included in this planning is the reactor servicing documentation and shipping analysis that will be submitted to Naval Reactors.

  3. REACTOR GROUT THERMAL PROPERTIES

    Energy Technology Data Exchange (ETDEWEB)

    Steimke, J.; Qureshi, Z.; Restivo, M.; Guerrero, H.

    2011-01-28

    Savannah River Site has five dormant nuclear production reactors. Long term disposition will require filling some reactor buildings with grout up to ground level. Portland cement based grout will be used to fill the buildings with the exception of some reactor tanks. Some reactor tanks contain significant quantities of aluminum which could react with Portland cement based grout to form hydrogen. Hydrogen production is a safety concern and gas generation could also compromise the structural integrity of the grout pour. Therefore, it was necessary to develop a non-Portland cement grout to fill reactors that contain significant quantities of aluminum. Grouts generate heat when they set, so the potential exists for large temperature increases in a large pour, which could compromise the integrity of the pour. The primary purpose of the testing reported here was to measure heat of hydration, specific heat, thermal conductivity and density of various reactor grouts under consideration so that these properties could be used to model transient heat transfer for different pouring strategies. A secondary purpose was to make qualitative judgments of grout pourability and hardened strength. Some reactor grout formulations were unacceptable because they generated too much heat, or started setting too fast, or required too long to harden or were too weak. The formulation called 102H had the best combination of characteristics. It is a Calcium Alumino-Sulfate grout that contains Ciment Fondu (calcium aluminate cement), Plaster of Paris (calcium sulfate hemihydrate), sand, Class F fly ash, boric acid and small quantities of additives. This composition afforded about ten hours of working time. Heat release began at 12 hours and was complete by 24 hours. The adiabatic temperature rise was 54 C which was within specification. The final product was hard and displayed no visible segregation. The density and maximum particle size were within specification.

  4. Scaleable, High Efficiency Microchannel Sabatier Reactor Project

    Data.gov (United States)

    National Aeronautics and Space Administration — A Microchannel Sabatier Reactor System (MSRS) consisting of cross connected arrays of isothermal or graded temperature reactors is proposed. The reactor array...

  5. LMFBR type reactor

    Energy Technology Data Exchange (ETDEWEB)

    Shimizu, Takeshi; Iida, Masaaki; Moriki, Yasuyuki

    1994-10-18

    A reactor core is divided into a plurality of coolants flowrate regions, and electromagnetic pumps exclusively used for each of the flowrate regions are disposed to distribute coolants flowrates in the reactor core. Further, the flowrate of each of the electromagnetic pumps is automatically controlled depending on signals from a temperature detector disposed at the exit of the reactor core, so that the flowrate of the region can be controlled optimally depending on the burning of reactor core fuels. Then, the electromagnetic pumps disposed for every divided region are controlled respectively, so that the coolants flowrate distribution suitable to each of the regions can be attained. Margin for fuel design is decreased, fuels are used effectively, as well as an operation efficiency can be improved. Moreover, since the electromagnetic pump has less flow resistance compared with a mechanical type pump, and flow resistance of the reactor core flowrate control mechanism is eliminated, greater circulating flowrate can be ensured after occurrence of accident in a natural convection using a buoyancy of coolants utilizable for after-heat removal as a driving force. (N.H.).

  6. Reactor Structural Materials: Reactor Pressure Vessel Steels

    Energy Technology Data Exchange (ETDEWEB)

    Chaouadi, R

    2000-07-01

    The objectives of SCK-CEN's R and D programme on Rector Pressure Vessel (RPV) Steels are:(1) to complete the fracture toughness data bank of various reactor pressure vessel steels by using precracked Charpy specimens that were tested statically as well as dynamically; (2) to implement the enhanced surveillance approach in a user-friendly software; (3) to improve the existing reconstitution technology by reducing the input energy (short cycle welding) and modifying the stud geometry. Progress and achievements in 1999 are reported.

  7. Thermionic Reactor Design Studies

    Energy Technology Data Exchange (ETDEWEB)

    Schock, Alfred

    1994-08-01

    Paper presented at the 29th IECEC in Monterey, CA in August 1994. The present paper describes some of the author's conceptual designs and their rationale, and the special analytical techniques developed to analyze their (thermionic reactor) performance. The basic designs, first published in 1963, are based on single-cell converters, either double-ended diodes extending over the full height of the reactor core or single-ended diodes extending over half the core height. In that respect they are similar to the thermionic fuel elements employed in the Topaz-2 reactor subsequently developed in the Soviet Union, copies of which were recently imported by the U.S. As in the Topaz-2 case, electrically heated steady-state performance tests of the converters are possible before fueling.

  8. Nuclear Rocket Engine Reactor

    CERN Document Server

    Lanin, Anatoly

    2013-01-01

    The development of a nuclear rocket engine reactor (NRER ) is presented in this book. The working capacity of an active zone NRER under mechanical and thermal load, intensive neutron fluxes, high energy generation (up to 30 MBT/l) in a working medium (hydrogen) at temperatures up to 3100 K is displayed. Design principles and bearing capacity of reactors area discussed on the basis of simulation experiments and test data of a prototype reactor. Property data of dense constructional, porous thermal insulating and fuel materials like carbide and uranium carbide compounds in the temperatures interval 300 - 3000 K are presented. Technological aspects of strength and thermal strength resistance of materials are considered. The design procedure of possible emergency processes in the NRER is developed and risks for their origination are evaluated. Prospects of the NRER development for pilotless space devices and piloted interplanetary ships are viewed.

  9. Operation of Reactor

    Institute of Scientific and Technical Information of China (English)

    1996-01-01

    3.1 Annual Report of SPR Operation Chu Shaochu Having overseen by National Nuclear Safety Administration and specialists, the reactor restarted up successfully after Safety renovation on April 16, 1996. In August 1996 the normal operation of SPR was approved by the authorities of Naitonal Nuclear Safety Administration. 1 Operation status In 1996, the reactor operated safely for 40 d and the energy released was about 137.3 MW·d. The operation status of SPR is shown in table 1. The reactor started up to higher power (power more than 1 MW) and lower power (for physics experiments) 4 times and 14 times respectively. Measurement of control rod efficiency and other measurement tasks were 2 times and 5 times respectively.

  10. An Overview of Reactor Concepts, a Survey of Reactor Designs.

    Science.gov (United States)

    1985-02-01

    Public Affairs Office and is releasaole to the National Technical Information Services (NTIS). At NTIS, it will be available to the general public...Reactors that use deu- terium (heavy water) as a coolant can use natural uranium as a fuel. The * Canadian reactor, CANDU , utilizes this concept...reactor core at the top and discharged at the Dotton while the reactor is in operation. The discharged fuel can then b inspected to see if it can De used

  11. Oscillatory flow chemical reactors

    Directory of Open Access Journals (Sweden)

    Slavnić Danijela S.

    2014-01-01

    Full Text Available Global market competition, increase in energy and other production costs, demands for high quality products and reduction of waste are forcing pharmaceutical, fine chemicals and biochemical industries, to search for radical solutions. One of the most effective ways to improve the overall production (cost reduction and better control of reactions is a transition from batch to continuous processes. However, the reactions of interests for the mentioned industry sectors are often slow, thus continuous tubular reactors would be impractically long for flow regimes which provide sufficient heat and mass transfer and narrow residence time distribution. The oscillatory flow reactors (OFR are newer type of tube reactors which can offer solution by providing continuous operation with approximately plug flow pattern, low shear stress rates and enhanced mass and heat transfer. These benefits are the result of very good mixing in OFR achieved by vortex generation. OFR consists of cylindrical tube containing equally spaced orifice baffles. Fluid oscillations are superimposed on a net (laminar flow. Eddies are generated when oscillating fluid collides with baffles and passes through orifices. Generation and propagation of vortices create uniform mixing in each reactor cavity (between baffles, providing an overall flow pattern which is close to plug flow. Oscillations can be created by direct action of a piston or a diaphragm on fluid (or alternatively on baffles. This article provides an overview of oscillatory flow reactor technology, its operating principles and basic design and scale - up characteristics. Further, the article reviews the key research findings in heat and mass transfer, shear stress, residence time distribution in OFR, presenting their advantages over the conventional reactors. Finally, relevant process intensification examples from pharmaceutical, polymer and biofuels industries are presented.

  12. Perspectives on reactor safety

    Energy Technology Data Exchange (ETDEWEB)

    Haskin, F.E. [New Mexico Univ., Albuquerque, NM (United States). Dept. of Chemical and Nuclear Engineering; Camp, A.L. [Sandia National Labs., Albuquerque, NM (United States)

    1994-03-01

    The US Nuclear Regulatory Commission (NRC) maintains a technical training center at Chattanooga, Tennessee to provide appropriate training to both new and experienced NRC employees. This document describes a one-week course in reactor, safety concepts. The course consists of five modules: (1) historical perspective; (2) accident sequences; (3) accident progression in the reactor vessel; (4) containment characteristics and design bases; and (5) source terms and offsite consequences. The course text is accompanied by slides and videos during the actual presentation of the course.

  13. Reactor Materials Research

    Energy Technology Data Exchange (ETDEWEB)

    Van Walle, E

    2002-04-01

    The activities of SCK-CEN's Reactor Materials Research Department for 2001 are summarised. The objectives of the department are: (1) to evaluate the integrity and behaviour of structural materials used in nuclear power industry; (2) to conduct research to unravel and understand the parameters that determine the material behaviour under or after irradiation; (3) to contribute to the interpretation, the modelling of the material behaviour and to develop and assess strategies for optimum life management of nuclear power plant components. The programmes within the department are focussed on studies concerning (1) Irradiation Assisted Stress Corrosion Cracking (IASCC); (2) nuclear fuel; and (3) Reactor Pressure Vessel Steel.

  14. A habitação como determinante social da saúde: percepções e condições de vida de famílias cadastradas no programa Bolsa Família Habitation as a social determinant of health: perceptions and conditions of families registered under the "Bolsa Família" program

    Directory of Open Access Journals (Sweden)

    Kelly Alves Magalhães

    2013-03-01

    Full Text Available Objetivou-se avaliar as condições de habitação e de saneamento de famílias cadastradas no Programa Bolsa Família (PBF, bem como analisar os significados dos sujeitos entrevistados sobre sua moradia. Trata-se de um estudo transversal, de abordagem quanti-qualitativa, realizado entre agosto e setembro de 2007, no município de Paula Candido, MG. Foram entrevistados 116 indivíduos cadastrados no programa, selecionados aleatoriamente, por meio de questionário semiestruturado. Os dados quantitativos foram analisados utilizando-se o software SPSS for Windows e os qualitativos, pela técnica de análise temática. Verificou-se que ambos os grupos - beneficiário e não beneficiário - enfrentam condições adversas que limitam sua inserção e emancipação social, como baixas escolaridade e qualificação para o trabalho; trabalho informal e mal remunerado; serviços ainda insuficientes de abastecimento e tratamento da água, além de esgotamento sanitário e coleta de lixo, especialmente entre as famílias residentes na zona rural. Quanto ao significado da moradia para os entrevistados, os relatos denotam o sonho por uma casa melhor e/ou a casa própria, a aquisição de bens e eletrodomésticos básicos que possam compor o espaço da habitação, espaço este que ultrapassa a dimensão física e material, configurando-se como lugar onde se estabelecem as relações e laços sociais entre a família e de acolhimento do outro. Faz-se necessária a articulação entre as ações e políticas públicas de saúde, habitação, meio ambiente e infraestrutura, bem como com os programas de combate à pobreza - como o PBF - , tendo em vista o conjunto de vulnerabilidades às quais estão submetidas as populações mais pobres.The objective of this study was to evaluate housing and sanitation conditions of families registered in the "Bolsa Família" Program (BFP, as well as to analyze the meaning of housing for the interviewees. It is a transversal

  15. Fluxos decisórios na formulação das condicionalidades de saúde do programa bolsa família Decision-making fluxes related to counterpart healthcare condition's concept in the programa bolsa família

    Directory of Open Access Journals (Sweden)

    Jorginete de Jesus Damião Trevisani

    2012-06-01

    Full Text Available Os programas de transferência condicionada de renda (TCR entram na agenda pública por sua potencialidade em interferir no ciclo intergeracional de pobreza. Este artigo tem como objetivo analisar o processo de formulação das condicionalidades de saúde do Programa Bolsa Família e, secundariamente, avaliar sua interface com a trajetória das políticas de alimentação e nutrição no Brasil. Para isso, o estudo adotou como referencial analítico o modelo de análise de múltiplos fluxos, proposto por Kingdon, para quem a mudança na agenda pública acontece com a convergência entre o fluxo dos problemas, o fluxo das soluções e alternativas e o fluxo político. A trajetória desses fluxos foi recomposta por meio da análise de documentos governamentais e de relatos orais obtidos por meio de entrevistas. No momento da formulação das condicionalidades de saúde, no fluxo de problemas, havia a necessidade de mudar a estratégia de combate à desnutrição, devido às críticas ao Incentivo ao Combate às Carências Nutricionais (ICCN e à extinção do Programa de Distribuição de Estoques de Alimentos (PRODEA. No que diz respeito ao fluxo das soluções, diversas propostas de TCR estavam em curso. No fluxo político, havia a decisão de criação de uma rede de proteção social. Nesse processo, a Coordenação Geral da Política de Alimentação e Nutrição assumiu o papel de empreendedora de políticas. A reflexão sobre esse processo ajuda a compreender o papel dos serviços de saúde em um programa de caráter intersetorial.This paper discusses the formulation process of conditional cash transfer associated with healthcare conditions demanded by Brazil's Family Allowance Program, Programa Bolsa Família (PBF, and also aims to analyze the interfaces of PBF and other nutrition policies. It used the multiple streams model proposed by Kingdon, which implies moving into a new "decision agenda" from the interation of three streams

  16. Programa Bolsa Família: a interface entre a atuação profissional e o direito humano a alimentação adequada The "Bolsa Família" family grant scheme: the interface between professional practice and the human right to adequate food and nutrition

    Directory of Open Access Journals (Sweden)

    Camila Irigonhé Ramos

    2012-08-01

    Full Text Available O Direito Humano à Alimentação Adequada deve ser garantido através de políticas públicas de Segurança Alimentar e Nutricional (SAN. Nesse contexto está inserido o Programa Bolsa Família (PBF, que, além da transferência de renda, visa a garantia de acesso aos direitos sociais básicos. Este estudo objetiva analisar a operacionalização do PBF e, consequentemente, o entendimento dos profissionais de saúde a respeito do programa, enquanto eixo estruturante da política pública de SAN. Para isso, realizou-se entrevistas semiestruturadas com trabalhadores da atenção primária, envolvidos diretamente, tanto com o PBF, quanto com as famílias que recebem este beneficio. Ao final do estudo, foi possível evidenciar a importância da formação dos profissionais que atuam nessa área, pois, ao desconectar a realidade social em que os beneficiários estão inseridos, dos objetivos do programa, colabora-se para a simples mecanização dessas práticas. Nesse sentido, aponta-se que os profissionais de saúde precisam entender as proposições do programa como estratégias político-sociais, as quais, para além do alívio imediato, visam a superação dos problemas relacionados à pobreza e à fome.The Human Right to Adequate Nutrition must be ensured through the public policies included in SAN, namely the Food and Nutritional Security campaign. Besides the income transfer geared to ensuring access to basic social rights, the "Bolsa Família" Program (PBF is included in this context. This study seeks to analyze the operational aspects of the PBF and also ascertain whether or not the health professionals see the program as a core element of the SAN public policy. With this in mind, semi-structured interviews were conducted with primary healthcare workers involved directly both with the PBF and with the families who receive this benefit. By the end of the study, it was possible to perceive the importance of training health professionals who

  17. Reactor operation environmental information document

    Energy Technology Data Exchange (ETDEWEB)

    Haselow, J.S.; Price, V.; Stephenson, D.E.; Bledsoe, H.W.; Looney, B.B.

    1989-12-01

    The Savannah River Site (SRS) produces nuclear materials, primarily plutonium and tritium, to meet the requirements of the Department of Defense. These products have been formed in nuclear reactors that were built during 1950--1955 at the SRS. K, L, and P reactors are three of five reactors that have been used in the past to produce the nuclear materials. All three of these reactors discontinued operation in 1988. Currently, intense efforts are being extended to prepare these three reactors for restart in a manner that protects human health and the environment. To document that restarting the reactors will have minimal impacts to human health and the environment, a three-volume Reactor Operations Environmental Impact Document has been prepared. The document focuses on the impacts of restarting the K, L, and P reactors on both the SRS and surrounding areas. This volume discusses the geology, seismology, and subsurface hydrology. 195 refs., 101 figs., 16 tabs.

  18. High Flux Isotope Reactor (HFIR)

    Data.gov (United States)

    Federal Laboratory Consortium — The HFIR at Oak Ridge National Laboratory is a light-water cooled and moderated reactor that is the United States’ highest flux reactor-based neutron source. HFIR...

  19. El sistema de la bolsa es útil como espaciador para la administración de los aerosoles presurizados A plastic bag is useful as spacer device for pressurized aerosol delivery

    Directory of Open Access Journals (Sweden)

    Laura Mendoza I

    2005-01-01

    Full Text Available Se ha demostrado que el depósito y efecto de los medicamentos administrados a través de los inhaladores presurizados mejora con el uso de espaciadores, pero la adherencia a estos accesorios no es buena por su costo y por su tamaño incómodo. Nuestro objetivo fue determinar si un sistema artesanal tipo reservorio, armado con una bolsa plástica unida a una boquilla de cartón, es efectivo como espaciador. Para esto, seleccionamos a 17 sujetos mayores de 16 años con espirometría con limitación ventilatoria obstructiva y respuesta espirométrica significativa a 200 µg de salbutamol en aerosol presurizado. Se les asignó aleatoriamente a dos grupos: uno con aerocámara y otro con bolsa. Con esta última se obtuvo aumento del VEF1 y de la CVF post broncodilatador de mayor magnitud que con la aerocámara, con diferencia estadística significativa. Nos parece que estos resultados validan al sistema de la bolsa como espaciador de aerosoles presurizados para el uso de los pacientesIt has been demostrated that the effect of inhaled medications is enhanced by spacer devices, but their sizes make them unpractical to carry around and they have additional cost. In order to test if a homemade cheap spacer is as effective as the commercial spacers, we tested a small plastic bag with a cardboard mouth piece. We recluted 17 patients over 16 years of age with an obstructive ventilatory limitation in spirometry with a significative response with 200 µg of albuterol. We randomized patients into two groups: one received the bronchodilator through a commercial spacer and the other through the homemade device. We observed that with the latter we obtained similar or better FEV1 and FVC increases. We conclude that the use of this cheap device can be used in patients with advantage over commercial ones

  20. Reactor operation safety information document

    Energy Technology Data Exchange (ETDEWEB)

    1990-01-01

    The report contains a reactor facility description which includes K, P, and L reactor sites, structures, operating systems, engineered safety systems, support systems, and process and effluent monitoring systems; an accident analysis section which includes cooling system anomalies, radioactive materials releases, and anticipated transients without scram; a summary of onsite doses from design basis accidents; severe accident analysis (reactor core disruption); a description of operating contractor organization and emergency planning; and a summary of reactor safety evolution. (MB)

  1. Thermal Reactor Safety

    Energy Technology Data Exchange (ETDEWEB)

    1980-06-01

    Information is presented concerning fire risk and protection; transient thermal-hydraulic analysis and experiments; class 9 accidents and containment; diagnostics and in-service inspection; risk and cost comparison of alternative electric energy sources; fuel behavior and experiments on core cooling in LOCAs; reactor event reporting analysis; equipment qualification; post facts analysis of the TMI-2 accident; and computational methods.

  2. Chromatographic and Related Reactors.

    Science.gov (United States)

    1988-01-07

    special information about effects of surface heteroge- neity in the methanation reaction. Studies of an efficient multicolumn assembly for measuring...of organic basic catalysts such as pyridine and 4-methylpicoline. It was demonstrated that the chromatographic reactor gave special information about...Programmed Reaction to obtain special information about surface heterogeneity in the methanation reaction. Advantages of stopped flow over steady state

  3. Nuclear Reactors and Technology

    Energy Technology Data Exchange (ETDEWEB)

    Cason, D.L.; Hicks, S.C. [eds.

    1992-01-01

    This publication Nuclear Reactors and Technology (NRT) announces on a monthly basis the current worldwide information available from the open literature on nuclear reactors and technology, including all aspects of power reactors, components and accessories, fuel elements, control systems, and materials. This publication contains the abstracts of DOE reports, journal articles, conference papers, patents, theses, and monographs added to the Energy Science and Technology Database during the past month. Also included are US information obtained through acquisition programs or interagency agreements and international information obtained through the International Energy Agency`s Energy Technology Data Exchange or government-to-government agreements. The digests in NRT and other citations to information on nuclear reactors back to 1948 are available for online searching and retrieval on the Energy Science and Technology Database and Nuclear Science Abstracts (NSA) database. Current information, added daily to the Energy Science and Technology Database, is available to DOE and its contractors through the DOE Integrated Technical Information System. Customized profiles can be developed to provide current information to meet each user`s needs.

  4. Fusion reactor materials

    Energy Technology Data Exchange (ETDEWEB)

    none,

    1989-01-01

    This paper discuses the following topics on fusion reactor materials: irradiation, facilities, test matrices, and experimental methods; dosimetry, damage parameters, and activation calculations; materials engineering and design requirements; fundamental mechanical behavior; radiation effects; development of structural alloys; solid breeding materials; and ceramics.

  5. WATER BOILER REACTOR

    Science.gov (United States)

    King, L.D.P.

    1960-11-22

    As its name implies, this reactor utilizes an aqueous solution of a fissionable element salt, and is also conventional in that it contains a heat exchanger cooling coil immersed in the fuel. Its novelty lies in the utilization of a cylindrical reactor vessel to provide a critical region having a large and constant interface with a supernatant vapor region, and the use of a hollow sleeve coolant member suspended from the cover assembly in coaxial relation with the reactor vessel. Cool water is circulated inside this hollow coolant member, and a gap between its outer wall and the reactor vessel is used to carry off radiolytic gases for recombination in an external catalyst chamber. The central passage of the coolant member defines a reflux condenser passage into which the externally recombined gases are returned and condensed. The large and constant interface between fuel solution and vapor region prevents the formation of large bubbles and minimizes the amount of fuel salt carried off by water vapor, thus making possible higher flux densities, specific powers and power densities.

  6. The First Reactor.

    Science.gov (United States)

    Department of Energy, Washington, DC.

    On December 2, 1942, in a racquet court underneath the West Stands of Stagg Field at the University of Chicago, a team of scientists led by Enrico Fermi created the first controlled, self-sustaining nuclear chain reaction. This updated and revised story of the first reactor (or "pile") is based on postwar interviews (as told to Corbin…

  7. MULTISTAGE FLUIDIZED BED REACTOR

    Science.gov (United States)

    Jonke, A.A.; Graae, J.E.A.; Levitz, N.M.

    1959-11-01

    A multistage fluidized bed reactor is described in which each of a number of stages is arranged with respect to an associated baffle so that a fluidizing gas flows upward and a granular solid downward through the stages and baffles, whereas the granular solid stopsflowing downward when the flow of fluidizing gas is shut off.

  8. Brazilian multipurpose reactor

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2014-07-01

    The Brazilian Multipurpose Reactor (RMB) Project is an action of the Federal Government, through the Ministry of Science Technology and Innovation (MCTI) and has its execution under the responsibility of the Brazilian National Nuclear Energy Commission (CNEN). Within the CNEN, the project is coordinated by the Research and Development Directorate (DPD) and developed through research units of this board: Institute of Nuclear Energy Research (IPEN); Nuclear Engineering Institute (IEN); Centre for Development of Nuclear Technology (CDTN); Regional Center of Nuclear Sciences (CRCN-NE); and Institute of Radiation Protection and Dosimetry (IRD). The Navy Technological Center in Sao Paulo (CTMSP) and also the participation of other research centers, universities, laboratories and companies in the nuclear sector are important and strategic partnerships. The conceptual design and the safety analysis of the reactor and main facilities, related to nuclear and environmental licensing, are performed by technicians of the research units of DPD / CNEN. The basic design was contracted to engineering companies as INTERTHECNE from Brazil and INVAP from Argentine. The research units from DPD/CNEN are also responsible for the design verification on all engineering documents developed by the contracted companies. The construction and installation should be performed by specific national companies and international partnerships. The Nuclear Reactor RMB will be a open pool type reactor with maximum power of 30 MW and have the OPAL nuclear reactor of 20 MW, built in Australia and designed by INVAP, as reference. The RMB reactor core will have a 5x5 configuration, consisting of 23 elements fuels (EC) of U{sub 3}Si{sub 2} dispersion-type Al having a density of up to 3.5 gU/cm{sup 3} and enrichment of 19.75% by weight of {sup 23{sup 5}}U. Two positions will be available in the core for materials irradiation devices. The main objectives of the RMB Reactor and the other nuclear and radioactive

  9. Modeling Chemical Reactors I: Quiescent Reactors

    CERN Document Server

    Michoski, C E; Schmitz, P G

    2010-01-01

    We introduce a fully generalized quiescent chemical reactor system in arbitrary space $\\vdim =1,2$ or 3, with $n\\in\\mathbb{N}$ chemical constituents $\\alpha_{i}$, where the character of the numerical solution is strongly determined by the relative scaling between the local reactivity of species $\\alpha_{i}$ and the local functional diffusivity $\\mathscr{D}_{ij}(\\alpha)$ of the reaction mixture. We develop an operator time-splitting predictor multi-corrector RK--LDG scheme, and utilize $hp$-adaptivity relying only on the entropy $\\mathscr{S}_{\\mathfrak{R}}$ of the reactive system $\\mathfrak{R}$. This condition preserves these bounded nonlinear entropy functionals as a necessarily enforced stability condition on the coupled system. We apply this scheme to a number of application problems in chemical kinetics; including a difficult classical problem arising in nonequilibrium thermodynamics known as the Belousov-Zhabotinskii reaction where we utilize a concentration-dependent diffusivity tensor $\\mathscr{D}_{ij}(...

  10. Alternative approaches to fusion. [reactor design and reactor physics for Tokamak fusion reactors

    Science.gov (United States)

    Roth, R. J.

    1976-01-01

    The limitations of the Tokamak fusion reactor concept are discussed and various other fusion reactor concepts are considered that employ the containment of thermonuclear plasmas by magnetic fields (i.e., stellarators). Progress made in the containment of plasmas in toroidal devices is reported. Reactor design concepts are illustrated. The possibility of using fusion reactors as a power source in interplanetary space travel and electric power plants is briefly examined.

  11. Evaluación Clínica de Gel Formulado a Base de Hojas de Pelargonium Robertianum L. (geranio) para el Tratamiento de Bolsas de Ojos ("ojeras") de origen acuoso

    OpenAIRE

    Bell Cortez, Carlos Alejandro; Universidad Alas Peruanas

    2012-01-01

    Se evaluó el efecto sobre las bolsas de ojos (“ojeras”) de origen acuoso de un gel formulado a base de hojas de Pelargonium robertianum L. (geranio), en 57 voluntarios de ambos sexos con edades comprendidas entre 20 y 50 años, todos residentes en la ciudad de Lima (Perú).La aplicación fue realizada una vez al día durante un mes, y se administró una dosis de preparado de aproximadamente 1,5 g diarios, excluyéndose la utilización de cualquier otro preparado convencional. El seguimiento clínico ...

  12. Propuesta de implantación de un Sistema de Gestión Ambiental en una empresa de fabricación de bolsas de plástico

    OpenAIRE

    CLIMENT CANALEJAS, MAR

    2014-01-01

    La elaboración del proyecto final de carrera tiene como fin la realización del diagnóstico ambiental como punto de partida para la implantación de un Sistema de Gestión Medioambiental normalizado en una empresa de fabricación de bolsas de plástico. Además se plantearán objetivos y metas y se definirán programas ambiéntales como parte de esa implantación, concretamente, de la fase de Planificación del Sistema de Gestión Ambiental. Este estudio preliminar podrá facilitar a la empresa en el futu...

  13. Revisión de precios y reputación de asesores financieros: dos propuestas de índices para explicar el rendimiento a corto plazo de las salidas a bolsa.

    Directory of Open Access Journals (Sweden)

    David Quintana Montero

    2005-01-01

    Full Text Available En este trabajo se proponen dos nuevos constructos para explicar el rendimiento de las acciones el día en que son admitidas a cotización. El primero de ellos captura la influencia del precio final de oferta en relación con el rango no vinculante propuesto a los inversores durante la preventa. El segundo tiene por objeto medir la importancia de la reputación de los asesores financieros encargados de gestionar la salida a bolsa. La capacidad explicativa de estas alternativas se evaluará a través de modelos de regresión lineal centrados en la estructura de la colocación.

  14. Paradigmas de Desenvolvimento e Disseminação de Políticas: Raízes Locais da Criação do Programa Bolsa Família

    OpenAIRE

    Leite,Cristiane Kerches da Silva; Peres,Úrsula Dias

    2015-01-01

    Este trabalho tem como objetivo discutir um dos vetores do processo de disseminação de políticas de transferência de renda no Brasil, especificamente a influência de uma experiência municipal, o Programa de Renda Mínima do Governo Marta Suplicy no município de São Paulo (2001-2004) na criação do Programa Bolsa Família no Governo Federal (a partir de 2003). O processo de formulação e implementação dos programas de desenvolvimento social no município de São Paulo (2001-2004) envolveu a construç...

  15. A implementação dos programas Bolsa-Família e oportunidades sob a perspectiva da condicionalidade educacional: uma análise a partir dos agentes públicos de base

    OpenAIRE

    Breynner Ricardo de Oliveira

    2014-01-01

    Este estudo analisa o processo de implementação dos Programas Bolsa-Família e Oportunidades a partir dos agentes públicos de implementação (street-level bureaucrats), sob a perspectiva da condicionalidade educacional. Ambos são programas que conferem um benefício monetário para as famílias que se encontram em situação de pobreza, vinculando a oferta deste benefício à condição de que as famílias cumpram com co-responsabilidades nas áreas da educação e saúde. O trabalho de Lipsky (1980) é consi...

  16. Etiología de las bolsas grasas palpebrales: Estudio anatómico relacionado con el envejecimiento y actitudes terapéuticas congruentes Inferior palpebral fat bags etiology: Anatomical study related to aging and congruent therapeutical attitudes

    Directory of Open Access Journals (Sweden)

    L. De la Cruz Ferrer

    2012-06-01

    Full Text Available Las bolsas grasas palpebrales inferiores son de las alteraciones más frecuentemente vistas en las consultas de Cirugía Estética. Realizamos una revisión de su controvertida etiología en relación con la anatomía orbitaria y los cambios producidos por en el proceso del envejecimiento de los tejidos orbitarios y exponemos las alternativas terapéuticas que actualmente consideramos más congruentes y fisiológicas y que han demostrado unos resultados consistentes.Inferior palpebral fat bags are among the most common causes of Aesthetic Surgery consultation. We review their controversial etiology related to the orbital anatomy and the changes that take place in the orbital tissues in the process of aging. Based on these hypotheses the authors describe the treatment alternatives which they consider most congruent and physiologic and that have proven consistent results.

  17. Reactor monitoring using antineutrino detectors

    Science.gov (United States)

    Bowden, N. S.

    2011-08-01

    Nuclear reactors have served as the antineutrino source for many fundamental physics experiments. The techniques developed by these experiments make it possible to use these weakly interacting particles for a practical purpose. The large flux of antineutrinos that leaves a reactor carries information about two quantities of interest for safeguards: the reactor power and fissile inventory. Measurements made with antineutrino detectors could therefore offer an alternative means for verifying the power history and fissile inventory of a reactor as part of International Atomic Energy Agency (IAEA) and/or other reactor safeguards regimes. Several efforts to develop this monitoring technique are underway worldwide.

  18. Reactor vessel support system. [LMFBR

    Science.gov (United States)

    Golden, M.P.; Holley, J.C.

    1980-05-09

    A reactor vessel support system includes a support ring at the reactor top supported through a box ring on a ledge of the reactor containment. The box ring includes an annular space in the center of its cross-section to reduce heat flow and is keyed to the support ledge to transmit seismic forces from the reactor vessel to the containment structure. A coolant channel is provided at the outside circumference of the support ring to supply coolant gas through the keyways to channels between the reactor vessel and support ledge into the containment space.

  19. Methanogenesis in Thermophilic Biogas Reactors

    DEFF Research Database (Denmark)

    Ahring, Birgitte Kiær

    1995-01-01

    Methanogenesis in thermophilic biogas reactors fed with different wastes is examined. The specific methanogenic activity with acetate or hydrogen as substrate reflected the organic loading of the specific reactor examined. Increasing the loading of thermophilic reactors stabilized the process...... as indicated by a lower concentration of volatile fatty acids in the effluent from the reactors. The specific methanogenic activity in a thermophilic pilot-plant biogas reactor fed with a mixture of cow and pig manure reflected the stability of the reactor. The numbers of methanogens counted by the most...... against Methanothrix soehngenii or Methanothrix CALS-I in any of the thermophilic biogas reactors examined. Studies using 2-14C-labeled acetate showed that at high concentrations (more than approx. 1 mM) acetate was metabolized via the aceticlastic pathway, transforming the methyl-group of acetate...

  20. DETERMINACIÓN DE LAS ÁREAS DE ACTIVIDAD Y ORGANIZACIÓN DEL ESPACIO DOMÉSTICO EN UNA UNIDAD RESIDENCIAL DEL SITIO ALDEANO TEMPRANO LA BOLSA 1 (TAFÍ DEL VALLE, TUCUMÁN, REP. ARGENTINA (Identification of Activity Areas and Organization of Domestic Space in a Residential Unit of the Early Villager Site La Bolsa 1 (Tafí del Valle, Tucumán, Republic of Argentina

    Directory of Open Access Journals (Sweden)

    Julián Salazar

    2013-02-01

    Full Text Available Este trabajo está orientado a la identificación de áreas de actividad dentro de una unidad residencial ubicada en el valle de Tafí (Tucumán, Argentina, con el objetivo de aportar al conocimiento de la organización en el espacio de las actividades cotidianas desarrolladas durante el primer milenio d. C. La vivienda analizada (U14 se encuentra en el sitio arqueológico La Bolsa 1, el cual constituye un asentamiento aldeano habitado principalmente desde 200 a. C. hasta 800 d. C. Se analizaron, integral y contextualmente, los rasgos fijos y semifijos de la estructura arquitectónica, las características morfológicas, tecnológicas y funcionales del conjunto cerámico y lítico y los resultados de los análisis sedimentológicos de muestras de suelo tomadas de todos los recintos. Esta información fue complementada con vestigios materiales analizados en el marco de previas investigaciones (microvestigios vegetales, dataciones radiocarbónicas y material óseo. ENGLISH: This study analyzes the activity areas within an archaeological dwelling from the Tafí valley, with the aim of addressing the spatial organization of quotidian activities developed during the first millennium AD. The analyzed household (U14, is located in the villager archaeological site La Bolsa 1, located in the north of the Tafí valley (Tucumán, Argentina, and inhabited since 200 BC up to 800 AD. Analyses included the study of fixed and semi-fixed features of the architectural structure, the morphological, technological and functional characteristics of pottery and lithic assemblages, and soil chemistry analysis from occupational floors. This information was complemented with previously studied evidence —botanical microfossils, radiocarbon dates and animal bones.

  1. MEANS FOR COOLING REACTORS

    Science.gov (United States)

    Wheeler, J.A.

    1957-11-01

    A design of a reactor is presented in which the fuel elements may be immersed in a liquid coolant when desired without the necessity of removing them from the reactor structure. The fuel elements, containing the fissionable material are in plate form and are disposed within spaced slots in a moderator material, such as graphite to form the core. Adjacent the core is a tank containing the liquid coolant. The fuel elements are mounted in spaced relationship on a rotatable shaft which is located between the core and the tank so that by rotation of the shaft the fuel elements may be either inserted in the slots in the core to sustain a chain reaction or immersed in the coolant.

  2. Compact fusion reactors

    CERN Document Server

    CERN. Geneva

    2015-01-01

    Fusion research is currently to a large extent focused on tokamak (ITER) and inertial confinement (NIF) research. In addition to these large international or national efforts there are private companies performing fusion research using much smaller devices than ITER or NIF. The attempt to achieve fusion energy production through relatively small and compact devices compared to tokamaks decreases the costs and building time of the reactors and this has allowed some private companies to enter the field, like EMC2, General Fusion, Helion Energy, Lawrenceville Plasma Physics and Lockheed Martin. Some of these companies are trying to demonstrate net energy production within the next few years. If they are successful their next step is to attempt to commercialize their technology. In this presentation an overview of compact fusion reactor concepts is given.

  3. Reactor Neutrino Spectra

    OpenAIRE

    Hayes, A. C.; Vogel, Petr

    2016-01-01

    We present a review of the antineutrino spectra emitted from reactors. Knowledge of these spectra and their associated uncertainties is crucial for neutrino oscillation studies. The spectra used to date have been determined either by converting measured electron spectra to antineutrino spectra or by summing over all of the thousands of transitions that make up the spectra, using modern databases as input. The uncertainties in the subdominant corrections to β-decay plague both methods, and we ...

  4. REACTOR MODERATOR STRUCTURE

    Science.gov (United States)

    Greenstreet, B.L.

    1963-12-31

    A system for maintaining the alignment of moderator block structures in reactors is presented. Integral restraining grids are placed between each layer of blocks in the moderator structure, at the top of the uppermost layer, and at the bottom of the lowermost layer. Slots are provided in the top and bottom surfaces of the moderator blocks so as to provide a keying action with the grids. The grids are maintained in alignment by vertical guiding members disposed about their peripheries. (AEC)

  5. BOILER-SUPERHEATED REACTOR

    Science.gov (United States)

    Heckman, T.P.

    1961-05-01

    A nuclear power reactor of the type in which a liquid moderator-coolant is transformed by nuclear heating into a vapor that may be used to drive a turbo- generator is described. The core of this reactor comprises a plurality of freely suspended tubular fuel elements, called fuel element trains, within which nonboiling pressurized liquid moderator-coolant is preheated and sprayed through orifices in the walls of the trains against the outer walls thereof to be converted into vapor. Passage of the vapor ovcr other unwetted portions of the outside of the fuel elements causes the steam to be superheated. The moderatorcoolant within the fuel elements remains in the liqUid state, and that between the fuel elements remains substantiaily in the vapor state. A unique liquid neutron-absorber control system is used. Advantages expected from the reactor design include reduced fuel element failure, increased stability of operation, direct response to power demand, and circulation of a minimum amount of liquid moderatorcoolant. (A.G.W.)

  6. Nuclear research reactors in Brazil

    Energy Technology Data Exchange (ETDEWEB)

    Cota, Anna Paula Leite; Mesquita, Amir Zacarias, E-mail: aplc@cdtn.b, E-mail: amir@cdtn.b [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte, MG (Brazil)

    2011-07-01

    The rising concerns about global warming and energy security have spurred a revival of interest in nuclear energy, giving birth to a 'nuclear power renaissance' in several countries in the world. Particularly in Brazil, in the recent years, the nuclear power renaissance can be seen in the actions that comprise its nuclear program, summarily the increase of the investments in nuclear research institutes and the government target to design and build the Brazilian Multipurpose research Reactor (BMR). In the last 50 years, Brazilian research reactors have been used for training, for producing radioisotopes to meet demands in industry and nuclear medicine, for miscellaneous irradiation services and for academic research. Moreover, the research reactors are used as laboratories to develop technologies in power reactors, which are evaluated today at around 450 worldwide. In this application, those reactors become more viable in relation to power reactors by the lowest cost, by the operation at low temperatures and, furthermore, by lower demand for nuclear fuel. In Brazil, four research reactors were installed: the IEA-R1 and the MB-01 reactors, both at the Instituto de Pesquisas Energeticas Nucleares (IPEN, Sao Paulo); the Argonauta, at the Instituto de Engenharia Nuclear (IEN, Rio de Janeiro) and the IPR-R1 TRIGA reactor, at the Centro de Desenvolvimento da Tecnologia Nuclear (CDTN, Belo Horizonte). The present paper intends to enumerate the characteristics of these reactors, their utilization and current academic research. Therefore, through this paper, we intend to collaborate on the BMR project. (author)

  7. Thermionic Reactor Design Studies

    Energy Technology Data Exchange (ETDEWEB)

    Schock, Alfred

    1994-06-01

    During the 1960's and early 70's the author performed extensive design studies, analyses, and tests aimed at thermionic reactor concepts that differed significantly from those pursued by other investigators. Those studies, like most others under Atomic Energy Commission (AEC and DOE) and the National Aeronautics and Space Administration (NASA) sponsorship, were terminated in the early 1970's. Some of this work was previously published, but much of it was never made available in the open literature. U.S. interest in thermionic reactors resumed in the early 80's, and was greatly intensified by reports about Soviet ground and flight tests in the late 80's. This recent interest resulted in renewed U.S. thermionic reactor development programs, primarily under Department of Defense (DOD) and Department of Energy (DOE) sponsorship. Since most current investigators have not had an opportunity to study all of the author's previous work, a review of the highlights of that work may be of value to them. The present paper describes some of the author's conceptual designs and their rationale, and the special analytical techniques developed to analyze their performance. The basic designs, first published in 1963, are based on single-cell converters, either double-ended diodes extending over the full height of the reactor core or single-ended diodes extending over half the core height. In that respect they are similar to the thermionic fuel elements employed in the Topaz-2 reactor subsequently developed in the Soviet Union, copies of which were recently imported by the U.S. As in the Topaz-2 case, electrically heated steady-state performance tests of the converters are possible before fueling. Where the author's concepts differed from the later Topaz-2 design was in the relative location of the emitter and the collector. Placing the fueled emitter on the outside of the cylindrical diodes permits much higher axial conductances to reduce ohmic

  8. Virus de la Enfermedad Infecciosa de la Bolsa de Fabricio: Relaciones antigénicas de aislados cubanos y chilenos Infectious Bursal Disease Virus: antigenic interrelationships between

    Directory of Open Access Journals (Sweden)

    J Noda

    2005-01-01

    Full Text Available La Enfermedad Infecciosa de la Bolsa (EIB sigue afectando la industria avícola por la aparición de variantes patogénicas y antigénicas del virus, originadas en la permanente evolución del virus producto de la presión inmunológica por el uso intensivo de vacunas. La caracterización antigénica de los virus de campo resulta esencial para la aplicación de vacunas más adecuadas en el control de la enfermedad. En este trabajo se determinaron las relaciones antigénicas de aislados cubanos y chilenos, obtenidos de poblaciones de pollos vacunados con el virus de la EIB. Los aislados virales se adaptaron a cultivos celulares y se obtuvieron antisueros monoespecíficos de cada uno de ellos y de una cepa de referencia. Las relaciones se establecieron por virusneu-tralización cruzada utilizando nueve aislados cubanos (BD, BL, 35/95, 29/96, 118/96, BF2, BF8, BF9 y 70/98, tres chilenos (G1, G2 y G4 y una cepa de referencia del serotipo 1 (Lukert. Los aislados cubanos y chilenos se adaptaron eficientemente a cultivos de fibroblastos de embrión de pollo (con excepción de BF3 y G3. Además, los aislados cubanos se adaptaron a células VERO, presentando mayores títulos infectivos en fibroblastos de embrión de pollo que en esta línea celular. Los resultados de la seroneutralización cruzada mostraron entre los aislados cubanos una relación mayor a un 80% y entre éstos y la cepa de referencia mayor de un 70%, de igual modo con los aislados chilenos G1 y G4 (mayor de 77%. El aislado G2 presentó diferencias antigénicas consideradas menores con los aislados cubanos BL, 35/95 y 29/96 (­ 69%. Ninguno de los aislados mostró relaciones antigénicas inferiores al 30% con la cepa de referencia del serotipo 1, por lo tanto no corresponden a cepas variantesInfectious Bursal Disease (IBD is still affecting the poultry industry through the appearance of pathogenic and antigenic variations of the virus. This is due to its permanent evolution as a

  9. Turning points in reactor design

    Energy Technology Data Exchange (ETDEWEB)

    Beckjord, E.S.

    1995-09-01

    This article provides some historical aspects on nuclear reactor design, beginning with PWR development for Naval Propulsion and the first commercial application at Yankee Rowe. Five turning points in reactor design and some safety problems associated with them are reviewed: (1) stability of Dresden-1, (2) ECCS, (3) PRA, (4) TMI-2, and (5) advanced passive LWR designs. While the emphasis is on the thermal-hydraulic aspects, the discussion is also about reactor systems.

  10. Fast reactor programme in India

    Indian Academy of Sciences (India)

    P Chellapandi; P R Vasudeva Rao; Prabhat Kumar

    2015-09-01

    Role of fast breeder reactor (FBR) in the Indian context has been discussed with appropriate justification. The FBR programme since 1985 till 2030 is highlighted focussing on the current status and future direction of fast breeder test reactor (FBTR), prototype fast breeder reactor (PFBR) and FBR-1 and 2. Design and technological challenges of PFBR and design and safety targets with means to achieve the same are the major highlights of this paper.

  11. Acceptability of reactors in space

    Energy Technology Data Exchange (ETDEWEB)

    Buden, D.

    1981-04-01

    Reactors are the key to our future expansion into space. However, there has been some confusion in the public as to whether they are a safe and acceptable technology for use in space. The answer to these questions is explored. The US position is that when reactors are the preferred technical choice, that they can be used safely. In fact, it dies not appear that reactors add measurably to the risk associated with the Space Transportation System.

  12. Spiral-shaped disinfection reactors

    KAUST Repository

    Ghaffour, Noreddine

    2015-08-20

    This disclosure includes disinfection reactors and processes for the disinfection of water. Some disinfection reactors include a body that defines an inlet, an outlet, and a spiral flow path between the inlet and the outlet, in which the body is configured to receive water and a disinfectant at the inlet such that the water is exposed to the disinfectant as the water flows through the spiral flow path. Also disclosed are processes for disinfecting water in such disinfection reactors.

  13. Hydrogen Production in Fusion Reactors

    OpenAIRE

    Sudo, S.; Tomita, Y.; Yamaguchi, S.; Iiyoshi, A.; Momota, H; Motojima, O.; Okamoto, M.; Ohnishi, M.; Onozuka, M; Uenosono, C.

    1993-01-01

    As one of methods of innovative energy production in fusion reactors without having a conventional turbine-type generator, an efficient use of radiation produced in a fusion reactor with utilizing semiconductor and supplying clean fuel in a form of hydrogen gas are studied. Taking the candidates of reactors such as a toroidal system and an open system for application of the new concepts, the expected efficiency and a concept of plant system are investigated.

  14. Neutrino Oscillation Studies with Reactors

    CERN Document Server

    Vogel, Petr; Zhang, Chao

    2015-01-01

    Nuclear reactors are one of the most intense, pure, controllable, cost-effective, and well-understood sources of neutrinos. Reactors have played a major role in the study of neutrino oscillations, a phenomenon that indicates that neutrinos have mass and that neutrino flavors are quantum mechanical mixtures. Over the past several decades reactors were used in the discovery of neutrinos, were crucial in solving the solar neutrino puzzle, and allowed the determination of the smallest mixing angle $\\theta_{13}$. In the near future, reactors will help to determine the neutrino mass hierarchy and to solve the puzzling issue of sterile neutrinos.

  15. FAST NEUTRONIC REACTOR

    Science.gov (United States)

    Snell, A.H.

    1957-12-01

    This patent relates to a reactor and process for carrying out a controlled fast neutron chain reaction. A cubical reactive mass, weighing at least 920 metric tons, of uranium metal containing predominantly U/sup 238/ and having a U/sup 235/ content of at least 7.63% is assembled and the maximum neutron reproduction ratio is limited to not substantially over 1.01 by insertion and removal of a varying amount of boron, the reactive mass being substantially freed of moderator.

  16. Biparticle fluidized bed reactor

    Science.gov (United States)

    Scott, C.D.

    1993-12-14

    A fluidized bed reactor system which utilizes a fluid phase, a retained fluidized primary particulate phase, and a migratory second particulate phase is described. The primary particulate phase is a particle such as a gel bead containing an immobilized biocatalyst. The secondary particulate phase, continuously introduced and removed in either cocurrent or countercurrent mode, acts in a secondary role such as a sorbent to continuously remove a product or by-product constituent from the fluid phase. Introduction and removal of the sorbent phase is accomplished through the use of feed screw mechanisms and multivane slurry valves. 3 figures.

  17. Licensed reactor nuclear safety criteria applicable to DOE reactors

    Energy Technology Data Exchange (ETDEWEB)

    1991-04-01

    The Department of Energy (DOE) Order DOE 5480.6, Safety of Department of Energy-Owned Nuclear Reactors, establishes reactor safety requirements to assure that reactors are sited, designed, constructed, modified, operated, maintained, and decommissioned in a manner that adequately protects health and safety and is in accordance with uniform standards, guides, and codes which are consistent with those applied to comparable licensed reactors. This document identifies nuclear safety criteria applied to NRC (Nuclear Regulatory Commission) licensed reactors. The titles of the chapters and sections of USNRC Regulatory Guide 1.70, Standard Format and Content of Safety Analysis Reports for Nuclear Power Plants, Rev. 3, are used as the format for compiling the NRC criteria applied to the various areas of nuclear safety addressed in a safety analysis report for a nuclear reactor. In each section the criteria are compiled in four groups: (1) Code of Federal Regulations, (2) US NRC Regulatory Guides, SRP Branch Technical Positions and Appendices, (3) Codes and Standards, and (4) Supplemental Information. The degree of application of these criteria to a DOE-owned reactor, consistent with their application to comparable licensed reactors, must be determined by the DOE and DOE contractor.

  18. Reactor Physics Analysis Models for a CANDU Reactor

    Energy Technology Data Exchange (ETDEWEB)

    Choi, Hang Bok

    2007-10-15

    Canada deuterium uranium (CANDU) reactor physics analysis is typically performed in three steps. At first, macroscopic cross-sections of the reference lattice is produced by modeling the reference fuel channel. Secondly macroscopic cross-sections of reactivity devices in the reactor are generated. The macroscopic cross-sections of a reactivity device are calculated as incremental cross-sections by subtracting macroscopic cross-sections of a three-dimensional lattice without reactivity device from those of a three-dimensional lattice with a reactivity device. Using the macroscopic cross-sections of the reference lattice and incremental cross-sections of the reactivity devices, reactor physics calculations are performed. This report summarizes input data of typical CANDU reactor physics codes, which can be utilized for the future CANDU reactor physics analysis.

  19. Brookhaven leak reactor to close

    CERN Multimedia

    MacIlwain, C

    1999-01-01

    The DOE has announced that the High Flux Beam Reactor at Brookhaven is to close for good. Though the news was not unexpected researchers were angry the decision had been taken before the review to assess the impact of reopening the reactor had been concluded (1 page).

  20. Thermochemical reactor systems and methods

    Energy Technology Data Exchange (ETDEWEB)

    Lipinski, Wojciech; Davidson, Jane Holloway; Chase, Thomas Richard

    2016-11-29

    Thermochemical reactor systems that may be used to produce a fuel, and methods of using the thermochemical reactor systems, utilizing a reactive cylindrical element, an optional energy transfer cylindrical element, an inlet gas management system, and an outlet gas management system.

  1. Chemical-vapor-deposition reactor

    Science.gov (United States)

    Chern, S.

    1979-01-01

    Reactor utilizes multiple stacked trays compactly arranged in paths of horizontally channeled reactant gas streams. Design allows faster and more efficient deposits of film on substrates, and reduces gas and energy consumption. Lack of dead spots that trap reactive gases reduces reactor purge time.

  2. Antineutrino Monitoring of Thorium Reactors

    CERN Document Server

    Akindele, Oluwatomi A; Norman, Eric B

    2015-01-01

    Various groups have demonstrated that antineutrino monitoring can be successful in assessing the plutonium content in water-cooled nuclear reactors for nonproliferation applications. New reactor designs and concepts incorporate nontraditional fuels types and chemistry. Understanding how these properties affect the antineutrino emission from a reactor can extend the applicability of antineutrino monitoring.Thorium molten salt reactors (MSR) breed U-233, that if diverted constitute an IAEA direct use material. The antineutrino spectrum from the fission of U-233 has been determined, the feasibility of detecting the diversion of a significant quantity, 8 kg of U-233, within the IAEA timeliness goal of 30 days has been evaluated. The antineutrino emission from a thorium reactor operating under normal conditions is compared to a diversion scenario at a 25 meter standoff by evaluating the daily antineutrino count rate and the energy spectrum of the detected antineutrinos. It was found that the diversion of a signifi...

  3. Engineering reactors for catalytic reactions

    Indian Academy of Sciences (India)

    Vivek V Ranade

    2014-03-01

    Catalytic reactions are ubiquitous in chemical and allied industries. A homogeneous or heterogeneous catalyst which provides an alternative route of reaction with lower activation energy and better control on selectivity can make substantial impact on process viability and economics. Extensive studies have been conducted to establish sound basis for design and engineering of reactors for practising such catalytic reactions and for realizing improvements in reactor performance. In this article, application of recent (and not so recent) developments in engineering reactors for catalytic reactions is discussed. Some examples where performance enhancement was realized by catalyst design, appropriate choice of reactor, better injection and dispersion strategies and recent advances in process intensification/ multifunctional reactors are discussed to illustrate the approach.

  4. Unsteady processes in catalytic reactors

    Energy Technology Data Exchange (ETDEWEB)

    Matros, Yu.Sh.

    1985-01-01

    In recent years a realization has occurred that reaction and reactor dynamics must be considered when designing and operating catalytic reactors. In this book, the author has focussed on both the processes occurring on individual porous-catalyst particles as well as the phenomena displayed by collections of these particles in fixed-bed reactors. The major topics discussed include the effects of unsteady-state heat and mass transfer, the influence of inhomogeneities and stagnant regions in fixed beds, and reactor operation during forced cycling of operating conditions. Despite the title of the book, attention is also paid to the determination of the number and stability of fixed-bed steady states, with the aim of describing the possibility of controlling reactors at unstable steady states. However, this development is somewhat dated, given the recent literature on multiplicity phenomena and process control.

  5. A model of reactor kinetics

    Energy Technology Data Exchange (ETDEWEB)

    Thompson, A.S.; Thompson, B.R.

    1988-09-01

    The analytical model of nuclear reactor transients, incorporating both mechanical and nuclear effects, simulates reactor kinetics. Linear analysis shows the stability borderline for small power perturbations. In a stable system, initial power disturbances die out with time. With an unstable combination of nuclear and mechanical characteristics, initial disturbances persist and may increase with time. With large instability, oscillations of great magnitude occur. Stability requirements set limits on the power density at which particular reactors can operate. The limiting power density depends largely on the product of two terms: the fraction of delayed neutrons and the frictional damping of vibratory motion in reactor core components. As the fraction of delayed neutrons is essentially fixed, mechanical damping largely determines the maximum power density. A computer program, based on the analytical model, calculates and plots reactor power as a nonlinear function of time in response to assigned values of mechanical and nuclear characteristics.

  6. Metallic fuels for advanced reactors

    Science.gov (United States)

    Carmack, W. J.; Porter, D. L.; Chang, Y. I.; Hayes, S. L.; Meyer, M. K.; Burkes, D. E.; Lee, C. B.; Mizuno, T.; Delage, F.; Somers, J.

    2009-07-01

    In the framework of the Generation IV Sodium Fast Reactor Program, the Advanced Fuel Project has conducted an evaluation of the available fuel systems supporting future sodium cooled fast reactors. This paper presents an evaluation of metallic alloy fuels. Early US fast reactor developers originally favored metal alloy fuel due to its high fissile density and compatibility with sodium. The goal of fast reactor fuel development programs is to develop and qualify a nuclear fuel system that performs all of the functions of a conventional fast spectrum nuclear fuel while destroying recycled actinides. This will provide a mechanism for closure of the nuclear fuel cycle. Metal fuels are candidates for this application, based on documented performance of metallic fast reactor fuels and the early results of tests currently being conducted in US and international transmutation fuel development programs.

  7. Prospección geológica y geofísica de sulfuros en el área de Virorco-La Bolsa, provincia de San Luis

    Directory of Open Access Journals (Sweden)

    J. Kostadinoff

    2005-09-01

    Full Text Available En los cuerpos máficos-ultramáficos del área de Virorco y La Bolsa, bloque central de la sierra de San Luis, se han detectado sulfuros polimetálicos en venillas y diseminados. Como herramienta de prospección geofísica se utilizó el método de autopotencial en combinación con estudios geomagnéticos. Los lentes máfico-ultramáficos están enmarcados por una caja gnéisicamigmatítica de alto grado. Una foliación milonítica de rumbo NNE y buzamiento de alto ángulo al ESE, afecta al basamento y también a los bordes de los cuerpos máfico-ultramáficos. Hacia el interior de estos últimos, alternan sectores que preservan las texturas granulares ígneas y una foliación buzante al oeste, con fajas de cizalla con foliación milonítica buzante al ESE. El estudio geofísico en Virorco indica una correspondencia entre los valores de autopotencial negativos (-150 mV y los máximos de magnetismo terrestre (+350 nT. En la zona de La Bolsa se realizaron dos perfiles de autopotencial, los cuales muestran un núcleo de autopotencial negativo de entre -40 y -55 mV, ligeramente alargado y buzante al ESE. Sobre el margen oriental, un valor de -90 mV constituye el núcleo de una anomalía alargada y también buzante al ESE. La disposición espacial de estas anomalías es coincidente con la orientación de la foliación milonítica. La correspondencia establecida con esta nueva herramienta de prospección, sustenta la removilización y concentración de los sulfuros primarios diseminados durante el evento de milonitización, ya planteada previamente en base a otras técnicas de estudio.

  8. Neutrino Experiments at Reactors

    Science.gov (United States)

    Reines, F.; Gurr, H. S.; Jenkins, T. L.; Munsee, J. H.

    1968-09-09

    A description is given of the electron-antineutrino program using a large fission reactor. A search has been made for a neutral weak interaction via the reaction (electron antineutrino + d .> p + n + electron antineutrino), the reaction (electron antineutrino + d .> n + n + e{sup +}) has now been detected, and an effort is underway to observe the elastic scattering reaction (electron antineutrino + e{sup -} .> electron antineutrino + e{sup -}) as well as to measure more precisely the reaction (electron antineutrino + p .> n + e{sup+}). The upper limit on the elastic scattering reaction which we have obtained with our large composite NaI, plastic, liquid scintillation detector is now about 50 times the predicted value.

  9. Neutronic Reactor Shield

    Science.gov (United States)

    Fermi, Enrico; Zinn, Walter H.

    The argument of the present Patent is a radiation shield suitable for protection of personnel from both gamma rays and neutrons. Such a shield from dangerous radiations is achieved to the best by the combined action of a neutron slowing material (a moderator) and a neutron absorbing material. Hydrogen is particularly effective for this shield since it is a good absorber of slow neutrons and a good moderator of fast neutrons. The neutrons slowed down by hydrogen may, then, be absorbed by other materials such as boron, cadmium, gadolinium, samarium or steel. Steel is particularly convenient for the purpose, given its effectiveness in absorbing also the gamma rays from the reactor (both primary gamma rays and secondary ones produced by the moderation of neutrons). In particular, in the present Patent a shield is described, made of alternate layers of steel and Masonite (an hydrolized ligno-cellulose material). The object of the present Patent is not discussed in any other published paper.

  10. Licensed reactor nuclear safety criteria applicable to DOE reactors

    Energy Technology Data Exchange (ETDEWEB)

    1993-11-01

    This document is a compilation and source list of nuclear safety criteria that the Nuclear Regulatory Commission (NRC) applies to licensed reactors; it can be used by DOE and DOE contractors to identify NRC criteria to be evaluated for application to the DOE reactors under their cognizance. The criteria listed are those that are applied to the areas of nuclear safety addressed in the safety analysis report of a licensed reactor. They are derived from federal regulations, USNRC regulatory guides, Standard Review Plan (SRP) branch technical positions and appendices, and industry codes and standards.

  11. Reactor service life extension program

    Energy Technology Data Exchange (ETDEWEB)

    Caskey, G.R.; Sindelar, R.L.; Ondrejcin, R.S.; Baumann, E.W.

    1990-12-31

    A review of the Savannah River Site production reactor systems was initiated in 1980 and led to implementation of the Reactor Materials Program in 1984 to assess reactor safety and reactor service life. The program evaluated performance of the reactor tanks, primary coolant piping, and thermal shields, components of welded construction that were fabricated from Type 304 stainless steel. The structural integrity analysis of the primary coolant system has shown that the pressure boundary is not susceptible to gross rupture, including a double ended guillotine break or equivalent large area bank. Residual service life is potentially limited by two material degradation modes, irradiation damage and intergranular stress corrosion cracking. Analysis of the structural integrity of the tanks and piping has shown that continued safe operation of the reactors for several additional decades is not limited by the material performance of the primary coolant system. Although irradiation damage has not degraded material behavior to an unacceptable level, past experience has revealed serious difficulties with repair welding on irradiated stainless steel. Stress corrosion can be mitigated by newly identified limits on impurity concentrations in the coolant water and by stress mitigation of weld residual stresses. Work continues in several areas: the effects of helium on mechanical behavior of irradiated stainless steel; improved weld methods for piping and the reactor tanks; and a surveillance program to track irradiation effects on the tank walls.

  12. Reactor service life extension program

    Energy Technology Data Exchange (ETDEWEB)

    Caskey, G.R.; Sindelar, R.L.; Ondrejcin, R.S.; Baumann, E.W.

    1990-01-01

    A review of the Savannah River Site production reactor systems was initiated in 1980 and led to implementation of the Reactor Materials Program in 1984 to assess reactor safety and reactor service life. The program evaluated performance of the reactor tanks, primary coolant piping, and thermal shields, components of welded construction that were fabricated from Type 304 stainless steel. The structural integrity analysis of the primary coolant system has shown that the pressure boundary is not susceptible to gross rupture, including a double ended guillotine break or equivalent large area bank. Residual service life is potentially limited by two material degradation modes, irradiation damage and intergranular stress corrosion cracking. Analysis of the structural integrity of the tanks and piping has shown that continued safe operation of the reactors for several additional decades is not limited by the material performance of the primary coolant system. Although irradiation damage has not degraded material behavior to an unacceptable level, past experience has revealed serious difficulties with repair welding on irradiated stainless steel. Stress corrosion can be mitigated by newly identified limits on impurity concentrations in the coolant water and by stress mitigation of weld residual stresses. Work continues in several areas: the effects of helium on mechanical behavior of irradiated stainless steel; improved weld methods for piping and the reactor tanks; and a surveillance program to track irradiation effects on the tank walls.

  13. Assessment of torsatrons as reactors

    Energy Technology Data Exchange (ETDEWEB)

    Lyon, J.F. (Oak Ridge National Lab., TN (United States)); Painter, S.L. (Australian National Univ., Canberra, ACT (Australia))

    1992-12-01

    Stellarators have significant operational advantages over tokamaks as ignited steady-state reactors because stellarators have no dangerous disruptions and no need for continuous current drive or power recirculated to the plasma, both easing the first wall, blanket, and shield design; less severe constraints on the plasma parameters and profiles; and better access for maintenance. This study shows that a reactor based on the torsatron configuration (a stellarator variant) could also have up to double the mass utilization efficiency (MUE) and a significantly lower cost of electricity (COE) than a conventional tokamak reactor (ARIES-I) for a range of assumptions. Torsatron reactors can have much smaller coil systems than tokamak reactors because the coils are closer to the plasma and they have a smaller cross section (higher average current density because of the lower magnetic field). The reactor optimization approach and the costing and component models are those used in the current stage of the ARIES-I tokamak reactor study. Typical reactor parameters for a 1-GW(e) Compact Torsatron reactor example are major radius R[sub 0] = 6.6-8.8 m, on-axis magnetic field B[sup 0] = 4.8-7.5 T, B[sub max] (on coils) = 16 T, MUE 140-210 kW(e)/tonne, and COE (in constant 1990 dollars) = 67-79 mill/kW(e)h. The results are relatively sensitive to assumptions on the level of confinement improvement and the blanket thickness under the inboard half of the helical windings but relatively insensitive to other assumptions.

  14. Contribuições do programa bolsa alfabetização na formação inicial do professor: o que evidenciam os relatos reflexivos produzidos por alunos de pedagogia

    Directory of Open Access Journals (Sweden)

    Ana Silvia Moço Aparicio

    2017-02-01

    Full Text Available No presente artigo, apresentamos e discutimos os resultados de uma pesquisa em que buscamos compreender o processo de formação docente de alunos de Pedagogia participantes do Programa Bolsa Alfabetização, implantado pelo governo do Estado de São Paulo. Como objeto de análise foram considerados os relatos reflexivos produzidos por esses alunos, a partir de suas observações e intervenções realizadas na sala de aula de alfabetização em que atuavam junto ao professor regente. Para as análises, adotamos como referenciais teórico-metodológicos as contribuições do Interacionismo Sociodiscursivo. Os resultados apontam que a inserção dos licenciandos no cotidiano da sala de aula, ao propiciar a familiarização desse futuro professor com o processo de ensino e aprendizagem na alfabetização nas diferentes situações didáticas que emergem nesse contexto, contribuem para a reconstrução do foco de observação pelos licenciandos e para a reelaboração de suas crenças e concepções de ensino e aprendizagem.

  15. O Programa institucional de bolsas de iniciação à docência numa universidade da grande São Paulo: depoimentos, contradições e reflexões preliminares

    Directory of Open Access Journals (Sweden)

    Roger Marchesini de Quadros Souza

    2014-07-01

    Full Text Available O texto apresenta um breve panorama das questões relativas à desvalorização do magistério (e a consequente crise das licenciaturas e de algumas iniciativas no sentido de sua superação, no âmbito das Instituições de Ensino Superior e das Políticas Públicas de valorização do Magistério, voltadas a formação docente neste nível de Ensino. A partir da experiência inicial da implantação do PIBID (Programa Institucional de Bolsas de Iniciação à Docência proposta por uma Universidade da Grande São Paulo, este artigo aponta os impactos positivos, contradições e reflexões iniciais sobre sua implantação, tendo como material de análise o registro escrito dos depoimentos de professores que participam do referido Programa.

  16. Analysis of Corporate Governance practices in the Colombia Stock Exchange Análisis de las Prácticas de Gobierno Corporativo en la Bolsa de Valores de Colombia

    Directory of Open Access Journals (Sweden)

    Diógenes Lagos Cortés

    2013-10-01

    Full Text Available This paper discusses the application of corporate governance practices, as defined in the Code of Best Corporate Practices (Código País in issuers Colombia Stock Exchange (BVC. Using regression models is evidence linking the implementation of corporate governance practices and the total amount demanded by investors in the market, this relationship is significant in non-financial issuers. It is observed that corporate governance practices related to board the greatest influence on demand, however, are applied to a lesser extent by issuers.En este documento se analiza la aplicación de las prácticas de gobierno corporativo, definidas en el código de mejores prácticas corporativas (Código País, en los emisores de la Bolsa de Valores de Colombia (BVC. Usando modelos de regresión se encuentra evidencia de la existencia de una relación entre la aplicación de prácticas de gobierno corporativo y el monto total demandado por los inversionistas en el mercado, esta relación es significativa en los emisores no financieros. Se observa que las prácticas de gobierno corporativo relacionadas con la junta directiva ejercen mayor influencia en la demanda; sin embargo, son aplicadas en menor medida por los emisores.

  17. Atresia anal, fístula uretrorretal congênita, bolsa escrotal acessória e pseudo-hermafroditismo em bezerro mestiço Anal atresia, congenital urethrorectal fistula, accessory scrotum and pseudohermafroditism in a crossbred calf

    Directory of Open Access Journals (Sweden)

    Thaís Gomes Rocha

    2010-05-01

    Full Text Available Neste trabalho, é descrito o caso de um bezerro mestiço recém-nascido que apresentava atresia anal tipo 2, fístula uretrorretal congênita, bolsa escrotal bífida e pseudo-hermafroditismo masculino. O principal sinal clínico era a eliminação de fezes por meio do óstio prepucial, uma apresentação incomum em casos de fístula uretrorretal em animais machos. Apesar de o quadro de atresia anal ser relativamente comum nessa espécie, os outros defeitos congênitos encontrados são pouco frequentes.In this study, the case of a newborn calf, which presented type 2 anal atresia, congenital urethrorectal fistula, bifid scrotum and male pseudohermafroditism is described. The main clinical sign was the elimination of feces by the prepucial ostium, an unusual finding in cases of urethrorectal fistula in male animals. Although anal atresia is relatively common in bovines, the other congenital defects found in this case are uncommon.

  18. O Programa Institucional de Bolsa de Iniciação à Docência: potencializador na formação docente dos acadêmicos do Curso de Pedagogia UNEMAT, Sinop - Mato Grosso

    Directory of Open Access Journals (Sweden)

    Danielle Batista Cardoso

    2015-11-01

    Full Text Available O artigo apresenta resultados do Trabalho de Conclusão de Curso, que objetivou analisar como o Subprojeto Programa Institucional de Bolsa de Iniciação à Docência (PIBID potencializa a formação docente no Curso de Pedagogia da Universidade do Estado de Mato Grosso em Sinop. A pesquisa é de caráter qualitativa e para coleta de dados utilizou documentos, entrevistas semiestruturadas com os sujeitos participantes do Subprojeto: coordenadores de área, supervisores e bolsistas de iniciação à docência. Buscou-se compreender sob que condições materiais e teóricas o PIBID potencializa a formação docente do curso de Pedagogia. Os resultados dessa formação é um processo de ações desenvolvidas entre universidade e escola que potencializa a formação docente. Palavras-chave: Curso de Pedagogia. Formação docente. Subprojeto PIBID.

  19. Selección de una cartera de valores mediante la aplicación de métodos multiobjetivo interactivos a datos reales de la Bolsa española.

    Directory of Open Access Journals (Sweden)

    Mariano Luque Gallego,

    2004-01-01

    Full Text Available En este trabajo aplicamos diversos métodos multiobjetivo interactivos a datos reales de la bolsa española, en concreto datos semanales del periodo 1995-2002. En nuestro modelo consideramos 5 funciones objetivo relacionadas con el deseo del decisor de maximizar la rentabilidad obtenida soportando el menor riesgo posible. Así, tratamos de maximizar la rentabilidad, minimizar la beta de la cartera como representante del riesgo sistemático, minimizar la desviación estándar y la covarianza las cuales recogen el riesgo global soportado y, por último, minimizar la varianza de los residuos como representante del riesgo específico. Tras obtener una solución mediante el método interactivo G-D-F, y tras solicitar información sobre sus preferencias al decisor, vamos cambiando de método para aprovechar las ventajas de cada uno hasta obtener una solución aceptada por el decisor.

  20. Análise da contribuição do Programa Bolsa Família para o enfrentamento da pobreza e a autonomia dos sujeitos beneficiários

    Directory of Open Access Journals (Sweden)

    Maurício Gregianin Testa

    2013-12-01

    Full Text Available Esta pesquisa reflete sobre a contribuição do Programa Bolsa Família (PBF para o enfrentamento da pobreza e uma maior autonomia dos sujeitos beneficiários. Foram coletados dados quantitativos com 103 famílias beneficiárias, complementados com entrevistas qualitativas com profissionais e famílias. Entre as formas de privação (educação, saúde, trabalho e renda etc., a educação mostrou-se o aspecto de privação que obteve os melhores resultados na percepção das famílias na busca da autonomia. A participação em atividades de apoio social tem efeito direto na percepção de melhoria da situação da família; entretanto, a participação das famílias mostrou-se incipiente. Essas atividades contribuem para o desenvolvimento da autonomia e podem ser compreendidas como o principal mecanismo do programa para as pessoas encontrarem as "portas de saída".

  1. Concept for LEU Burst Reactor

    Energy Technology Data Exchange (ETDEWEB)

    Klein, Steven Karl [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Kimpland, Robert Herbert [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2016-03-07

    Design and performance of a proposed LEU burst reactor are sketched. Salient conclusions reached are the following: size would be ~1,500 kg or greater, depending on the size of the central cavity; internal stresses during burst require split rings for relief; the reactor would likely require multiple control and safety rods for fine control; the energy spectrum would be comparable to that of HEU machines; and burst yields and steady-state power levels will be significantly greater in an LEU reactor.

  2. Nuclear reactor downcomer flow deflector

    Energy Technology Data Exchange (ETDEWEB)

    Gilmore, Charles B. (Greensburg, PA); Altman, David A. (Pittsburgh, PA); Singleton, Norman R. (Murrysville, PA)

    2011-02-15

    A nuclear reactor having a coolant flow deflector secured to a reactor core barrel in line with a coolant inlet nozzle. The flow deflector redirects incoming coolant down an annulus between the core barrel and the reactor vessel. The deflector has a main body with a front side facing the fluid inlet nozzle and a rear side facing the core barrel. The rear side of the main body has at least one protrusion secured to the core barrel so that a gap exists between the rear side of the main body adjacent the protrusion and the core barrel. Preferably, the protrusion is a relief that circumscribes the rear side of the main body.

  3. Safety of VVER-440 reactors

    CERN Document Server

    Slugen, Vladimir

    2011-01-01

    Safety of VVER-440 Reactors endeavours to promote an increase in the safety of VVER-440 nuclear reactors via the improvement of fission products limitation systems and the implementation of special non-destructive spectroscopic methods for materials testing. All theoretical and experimental studies performed the by author over the last 25 years have been undertaken with the aim of improving VVER-440 defence in depth, which is one of the most important principle for ensuring safety in nuclear power plants. Safety of VVER-440 Reactors is focused on the barrier system through which the safety pri

  4. Random processes in nuclear reactors

    CERN Document Server

    Williams, M M R

    1974-01-01

    Random Processes in Nuclear Reactors describes the problems that a nuclear engineer may meet which involve random fluctuations and sets out in detail how they may be interpreted in terms of various models of the reactor system. Chapters set out to discuss topics on the origins of random processes and sources; the general technique to zero-power problems and bring out the basic effect of fission, and fluctuations in the lifetime of neutrons, on the measured response; the interpretation of power reactor noise; and associated problems connected with mechanical, hydraulic and thermal noise sources

  5. Fuel Fabrication and Nuclear Reactors

    Energy Technology Data Exchange (ETDEWEB)

    Karpius, Peter Joseph [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2017-02-02

    The uranium from the enrichment plant is still in the form of UF6. UF6 is not suitable for use in a reactor due to its highly corrosive chemistry as well as its phase diagram. UF6 is converted into UO2 fuel pellets, which are in turn placed in fuel rods and assemblies. Reactor designs are variable in moderators, coolants, fuel, performance etc.The dream of energy ‘too-cheap to meter’ is no more, and now the nuclear power industry is pushing ahead with advanced reactor designs.

  6. Nuclear reactor PBMR and cogeneration; Reactor nuclear PBMR y cogeneracion

    Energy Technology Data Exchange (ETDEWEB)

    Ramirez S, J. R.; Alonso V, G., E-mail: ramon.ramirez@inin.gob.mx [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico)

    2013-10-15

    In recent years the nuclear reactor designs for the electricity generation have increased their costs, so that at the moment costs are managed of around the 5000 US D for installed kw, reason for which a big nuclear plant requires of investments of the order of billions of dollars, the designed reactors as modular of low power seek to lighten the initial investment of a big reactor dividing the power in parts and dividing in modules the components to lower the production costs, this way it can begin to build a module and finished this to build other, differing the long term investment, getting less risk therefore in the investment. On the other hand the reactors of low power can be very useful in regions where is difficult to have access to the electric net being able to take advantage of the thermal energy of the reactor to feed other processes like the water desalination or the vapor generation for the processes industry like the petrochemical, or even more the possible hydrogen production to be used as fuel. In this work the possibility to generate vapor of high quality for the petrochemical industry is described using a spheres bed reactor of high temperature. (Author)

  7. FASTER test reactor preconceptual design report summary

    Energy Technology Data Exchange (ETDEWEB)

    Grandy, C. [Argonne National Lab. (ANL), Argonne, IL (United States); Belch, H. [Argonne National Lab. (ANL), Argonne, IL (United States); Brunett, A. [Argonne National Lab. (ANL), Argonne, IL (United States); Heidet, F. [Argonne National Lab. (ANL), Argonne, IL (United States); Hill, R. [Argonne National Lab. (ANL), Argonne, IL (United States); Hoffman, E. [Argonne National Lab. (ANL), Argonne, IL (United States); Jin, E. [Argonne National Lab. (ANL), Argonne, IL (United States); Mohamed, W. [Argonne National Lab. (ANL), Argonne, IL (United States); Moisseytsev, A. [Argonne National Lab. (ANL), Argonne, IL (United States); Passerini, S. [Argonne National Lab. (ANL), Argonne, IL (United States); Sienicki, J. [Argonne National Lab. (ANL), Argonne, IL (United States); Sumner, T. [Argonne National Lab. (ANL), Argonne, IL (United States); Vilim, R. [Argonne National Lab. (ANL), Argonne, IL (United States); Hayes, Steven [Argonne National Lab. (ANL), Argonne, IL (United States)

    2016-02-29

    The FASTER reactor plant is a sodium-cooled fast spectrum test reactor that provides high levels of fast and thermal neutron flux for scientific research and development. The 120MWe FASTER reactor plant has a superheated steam power conversion system which provides electrical power to a local grid allowing for recovery of operating costs for the reactor plant.

  8. ADAPTIVE CONTROL SYSTEM OF INDUSTRIAL REACTORS

    Directory of Open Access Journals (Sweden)

    Vyacheslav K. Mayevski

    2014-01-01

    Full Text Available This paper describes a mathematical model of an industrial chemical reactor for production of synthetic rubber. During reactor operation the model parameters vary considerably. To create a control algorithm performed transformation of mathematical model of the reactor in order to obtain a dependency that can be used to determine the model parameters are changing during reactor operation.

  9. FASTER Test Reactor Preconceptual Design Report

    Energy Technology Data Exchange (ETDEWEB)

    Grandy, C. [Argonne National Lab. (ANL), Argonne, IL (United States); Belch, H. [Argonne National Lab. (ANL), Argonne, IL (United States); Brunett, A. J. [Argonne National Lab. (ANL), Argonne, IL (United States); Heidet, F. [Argonne National Lab. (ANL), Argonne, IL (United States); Hill, R. [Argonne National Lab. (ANL), Argonne, IL (United States); Hoffman, E. [Argonne National Lab. (ANL), Argonne, IL (United States); Jin, E. [Argonne National Lab. (ANL), Argonne, IL (United States); Mohamed, W. [Argonne National Lab. (ANL), Argonne, IL (United States); Moisseytsev, A. [Argonne National Lab. (ANL), Argonne, IL (United States); Passerini, S. [Argonne National Lab. (ANL), Argonne, IL (United States); Sienicki, J. [Argonne National Lab. (ANL), Argonne, IL (United States); Sumner, T. [Argonne National Lab. (ANL), Argonne, IL (United States); Vilim, R. [Argonne National Lab. (ANL), Argonne, IL (United States); Hayes, S. [Argonne National Lab. (ANL), Argonne, IL (United States)

    2016-03-31

    The FASTER test reactor plant is a sodium-cooled fast spectrum test reactor that provides high levels of fast and thermal neutron flux for scientific research and development. The 120MWe FASTER reactor plant has a superheated steam power conversion system which provides electrical power to a local grid allowing for recovery of operating costs for the reactor plant.

  10. Breeder Reactors, Understanding the Atom Series.

    Science.gov (United States)

    Mitchell, Walter, III; Turner, Stanley E.

    The theory of breeder reactors in relationship to a discussion of fission is presented. Different kinds of reactors are characterized by the cooling fluids used, such as liquid metal, gas, and molten salt. The historical development of breeder reactors over the past twenty-five years includes specific examples of reactors. The location and a brief…

  11. Evolution of the tandem mirror reactor concept

    Energy Technology Data Exchange (ETDEWEB)

    Carlson, G.A.; Logan, B.G.

    1982-03-09

    We discuss the evolution of the tandem mirror reactor concept from the original conceptual reactor design (1977) through the first application of the thermal barrier concept to a reactor design (1979) to the beginning of the Mirror Advanced Reactor Study (1982).

  12. Percurso metodológico de análise do Programa Bolsa Família na RMS/Bahia: estudo de caso de Camaçari, Candeias e Simões Filho = The methodological pathway of the analysis of Family Scholarship (Bolsa Família in RMS/Bahia: a case study of Camaçari, Candeias e Simões Filho

    Directory of Open Access Journals (Sweden)

    Dornelles, Denise Yasodã Freitas

    2010-01-01

    Full Text Available O artigo apresenta o caminho metodológico seguido durante o percurso da investigação, apresentando os diferentes processos em que a mesma foi desenvolvida: enquadramento do estudo, constituição da amostra e trabalho de campo. A situação de entrevistas: contextos, atores, efeitos sociais e a metodologia de tratamento dos dados sobre os impactos dos Programas de Transferência de Renda, nomeadamente o Programa Bolsa Família no universo dos municípios de Camaçari, Candeias e Simões Filho, situados na Região Metropolitana da cidade de Salvador no estado da Bahia. Torna-se importante destacar que os aportes que balizaram o referencial teórico e empírico da pesquisa foram de cunho sociológico, na perspectiva de uma investigação científica permeada por um olhar característico do Serviço Social, portanto, uma pesquisa orientada e aplicada eminentemente dentro deste universo heurístico. Neste sentido, os diálogos conceituais postularam elementos do campo das políticas sociais, de estudos sobre família, pobreza, vulnerabilidade e dos estudos sobre exclusão social

  13. Jules Horowitz Reactor, basic design

    Energy Technology Data Exchange (ETDEWEB)

    Bergamaschi, Y.; Bouilloux, Y.; Chantoin, P.; Guigon, B.; Bravo, X.; Germain, C.; Rommens, M.; Tremodeux, P

    2003-07-01

    Since the shutdown of the SILOE reactor in 1997, the OSIRIS reactor has ensured the needs regarding technological irradiation at CEA including those of its industrial partners and customers. The Jules Horowitz Reactor will replace it. It has the ambition to provide the necessary nuclear data and maintain a fission research capacity in Europe after 2010. This capacity should be service-oriented. It will be established in Cadarache. The Jules Horowitz reactor will also: - represent a significant step in term of performances and experimental capabilities, - be designed with a high flexibility, in order to satisfy the current demand from European industry, research and be able to accommodate future requirements, - reach a high level of safety, according to the best current practice. This paper will present the main functionalities and the design options resulting from the 'preliminary design' studies. (authors)

  14. Advanced Catalytic Hydrogenation Retrofit Reactor

    Energy Technology Data Exchange (ETDEWEB)

    Reinaldo M. Machado

    2002-08-15

    Industrial hydrogenation is often performed using a slurry catalyst in large stirred-tank reactors. These systems are inherently problematic in a number of areas, including industrial hygiene, process safety, environmental contamination, waste production, process operability and productivity. This program proposed the development of a practical replacement for the slurry catalysts using a novel fixed-bed monolith catalyst reactor, which could be retrofitted onto an existing stirred-tank reactor and would mitigate many of the minitations and problems associated with slurry catalysts. The full retrofit monolith system, consisting of a recirculation pump, gas/liquid ejector and monolith catalyst, is described as a monolith loop reactor or MLR. The MLR technology can reduce waste and increase raw material efficiency, which reduces the overall energy required to produce specialty and fine chemicals.

  15. Advanced Carbothermal Electric Reactor Project

    Data.gov (United States)

    National Aeronautics and Space Administration — The overall objective of the Phase 1 effort was to demonstrate the technical feasibility of the Advanced Carbothermal Electric (ACE) Reactor concept. Unlike...

  16. Reactor operation environmental information document

    Energy Technology Data Exchange (ETDEWEB)

    Bauer, L.R.; Hayes, D.W.; Hunter, C.H.; Marter, W.L.; Moyer, R.A.

    1989-12-01

    This volume is a reactor operation environmental information document for the Savannah River Plant. Topics include meteorology, surface hydrology, transport, environmental impacts, and radiation effects. 48 figs., 56 tabs. (KD)

  17. Unique features of space reactors

    Science.gov (United States)

    Buden, David

    Space reactors are designed to meet a unique set of requirements; they must be sufficiently compact to be launched in a rocket to their operational location, operate for many years without maintenance and servicing, operate in extreme environments, and reject heat by radiation to space. To meet these restrictions, operating temperatures are much greater than in terrestrial power plants, and the reactors tend to have a fast neutron spectrum. Currently, a new generation of space reactor power plants is being developed. The major effort is in the SP-100 program, where the power plant is being designed for seven years of full power, and no maintenance operation at a reactor outlet operating temperature of 1350 K.

  18. Thermal Analysis for Mobile Reactor

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    <正>Mobile reactor design in the paper is consisted of two grades of thermal electric conversion. The first grade is the thermionic conversion inside the core and the second grade is thermocouple conversion

  19. Teaching About Nature's Nuclear Reactors

    CERN Document Server

    Herndon, J M

    2005-01-01

    Naturally occurring nuclear reactors existed in uranium deposits on Earth long before Enrico Fermi built the first man-made nuclear reactor beneath Staggs Field in 1942. In the story of their discovery, there are important lessons to be learned about scientific inquiry and scientific discovery. Now, there is evidence to suggest that the Earth's magnetic field and Jupiter's atmospheric turbulence are driven by planetary-scale nuclear reactors. The subject of planetocentric nuclear fission reactors can be a jumping off point for stimulating classroom discussions about the nature and implications of planetary energy sources and about the geomagnetic field. But more importantly, the subject can help to bring into focus the importance of discussing, debating, and challenging current thinking in a variety of areas.

  20. Advanced Carbothermal Electric Reactor Project

    Data.gov (United States)

    National Aeronautics and Space Administration — ORBITEC proposes to develop the Advanced Carbothermal Electric (ACE) reactor to efficiently extract oxygen from lunar regolith. Unlike state-of-the-art carbothermal...

  1. Solid State Reactor Final Report

    Energy Technology Data Exchange (ETDEWEB)

    Mays, G.T.

    2004-03-10

    The Solid State Reactor (SSR) is an advanced reactor concept designed to take advantage of Oak Ridge National Laboratory's (ORNL's) recently developed graphite foam that has enhanced heat transfer characteristics and excellent high-temperature mechanical properties, to provide an inherently safe, self-regulated, source of heat for power and other potential applications. This work was funded by the U.S. Department of Energy's Nuclear Energy Research Initiative (NERI) program (Project No. 99-064) from August 1999 through September 30, 2002. The initial concept of utilizing the graphite foam as a basis for developing an advanced reactor concept envisioned that a suite of reactor configurations and power levels could be developed for several different applications. The initial focus was looking at the reactor as a heat source that was scalable, independent of any heat removal/power conversion process. These applications might include conventional power generation, isotope production and destruction (actinides), and hydrogen production. Having conducted the initial research on the graphite foam and having performed the scoping parametric analyses from neutronics and thermal-hydraulic perspectives, it was necessary to focus on a particular application that would (1) demonstrate the viability of the overall concept and (2) require a reasonably structured design analysis process that would synthesize those important parameters that influence the concept the most as part of a feasible, working reactor system. Thus, the application targeted for this concept was supplying power for remote/harsh environments and a design that was easily deployable, simplistic from an operational standpoint, and utilized the new graphite foam. Specifically, a 500-kW(t) reactor concept was pursued that is naturally load following, inherently safe, optimized via neutronic studies to achieve near-zero reactivity change with burnup, and proliferation resistant. These four major areas

  2. Microchannel Reactors for ISRU Applications

    Science.gov (United States)

    Carranza, Susana; Makel, Darby B.; Blizman, Brandon; Ward, Benjamin J.

    2005-02-01

    Affordable planning and execution of prolonged manned space missions depend upon the utilization of local resources and the waste products which are formed in manned spacecraft and surface bases. Successful in-situ resources utilization (ISRU) will require component technologies which provide optimal size, weight, volume, and power efficiency. Microchannel reactors enable the efficient chemical processing of in situ resources. The reactors can be designed for the processes that generate the most benefit for each mission. For instance, propellants (methane) can be produced from carbon dioxide from the Mars atmosphere using the Sabatier reaction and ethylene can be produced from the partial oxidation of methane. A system that synthesizes ethylene could be the precursor for systems to synthesize ethanol and polyethylene. Ethanol can be used as a nutrient for Astrobiology experiments, as well as the production of nutrients for human crew (e.g. sugars). Polyethylene can be used in the construction of habitats, tools, and replacement parts. This paper will present recent developments in miniature chemical reactors using advanced Micro Electro Mechanical Systems (MEMS) and microchannel technology to support ISRU of Mars and lunar missions. Among other applications, the technology has been demonstrated for the Sabatier process and for the partial oxidation of methane. Microchannel reactors were developed based on ceramic substrates as well as metal substrates. In both types of reactors, multiple layers coated with catalytic material are bonded, forming a monolithic structure. Such reactors are readily scalable with the incorporation of extra layers. In addition, this reactor structure minimizes pressure drop and catalyst settling, which are common problems in conventional packed bed reactors.

  3. Reactor antineutrinos and nuclear physics

    Science.gov (United States)

    Balantekin, A. B.

    2016-11-01

    Short-baseline reactor neutrino experiments successfully measured the neutrino parameters they set out to measure, but they also identified a shape distortion in the 5-7 MeV range as well as a reduction from the predicted value of the flux. Nuclear physics input into the calculations of reactor antineutrino spectra needs to be better refined if this anomaly is to be interpreted as due to sterile neutrino states.

  4. Reactor Simulator Testing

    Science.gov (United States)

    Schoenfeld, Michael P.; Webster, Kenny L.; Pearson, Boise J.

    2013-01-01

    As part of the Nuclear Systems Office Fission Surface Power Technology Demonstration Unit (TDU) project, a reactor simulator test loop (RxSim) was design & built to perform integrated testing of the TDU components. In particular, the objectives of RxSim testing was to verify the operation of the core simulator, the instrumentation and control system, and the ground support gas and vacuum test equipment. In addition, it was decided to include a thermal test of a cold trap purification design and a pump performance test at pump voltages up to 150 V since the targeted mass flow rate of 1.75 kg/s was not obtained in the RxSim at the originally constrained voltage of 120 V. This paper summarizes RxSim testing. The gas and vacuum ground support test equipment performed effectively in NaK fill, loop pressurization, and NaK drain operations. The instrumentation and control system effectively controlled loop temperature and flow rates or pump voltage to targeted settings. The cold trap design was able to obtain the targeted cold temperature of 480 K. An outlet temperature of 636 K was obtained which was lower than the predicted 750 K but 156 K higher than the cold temperature indicating the design provided some heat regeneration. The annular linear induction pump (ALIP) tested was able to produce a maximum flow rate of 1.53 kg/s at 800 K when operated at 150 V and 53 Hz.

  5. Novel Catalytic Membrane Reactors

    Energy Technology Data Exchange (ETDEWEB)

    Stuart Nemser, PhD

    2010-10-01

    There are many industrial catalytic organic reversible reactions with amines or alcohols that have water as one of the products. Many of these reactions are homogeneously catalyzed. In all cases removal of water facilitates the reaction and produces more of the desired chemical product. By shifting the reaction to right we produce more chemical product with little or no additional capital investment. Many of these reactions can also relate to bioprocesses. Given the large number of water-organic compound separations achievable and the ability of the Compact Membrane Systems, Inc. (CMS) perfluoro membranes to withstand these harsh operating conditions, this is an ideal demonstration system for the water-of-reaction removal using a membrane reactor. Enhanced reaction synthesis is consistent with the DOE objective to lower the energy intensity of U.S. industry 25% by 2017 in accord with the Energy Policy Act of 2005 and to improve the United States manufacturing competitiveness. The objective of this program is to develop the platform technology for enhancing homogeneous catalytic chemical syntheses.

  6. LMFBR type reactor

    Energy Technology Data Exchange (ETDEWEB)

    Iwashige, Kengo

    1996-06-21

    In an LMFBR type reactor, partitions are disposed to a coolant channel at positions lower than the free liquid level, and the width of the partitions is adapted to have a predetermined condition. Namely, when low temperature fluid overflowing the wall of the coolant channel, flows down and collided against the free liquid surface in the coolant channel, since the dropping speed thereof is reduced abruptly, large pressure waves are caused by kinetic force of the low temperature fluid. However, if appropriate numbers of partitions having an appropriate shape are formed, the dropping speed of the low temperature fluid is moderated to reduce the pressure waves. In addition, since the pressure waves are dispersed to the circumferential and lateral directions of the coolant flow channel respectively, the propagation of the pressure waves can be prevented effectively. Further, when the flow of the low temperature fluid is changed to the circumferential direction, for example, by earthquakes, since the partitions act as members resisting against the circumferential change of the low temperature fluid, the change of the direction can be suppressed. (N.H.)

  7. Calculation of reactor antineutrino spectra in TEXONO

    CERN Document Server

    Chen Dong Liang; Mao Ze Pu; Wong, T H

    2002-01-01

    In the low energy reactor antineutrino physics experiments, either for the researches of antineutrino oscillation and antineutrino reactions, or for the measurement of abnormal magnetic moment of antineutrino, the flux and the spectra of reactor antineutrino must be described accurately. The method of calculation of reactor antineutrino spectra was discussed in detail. Furthermore, based on the actual circumstances of NP2 reactors and the arrangement of detectors, the flux and the spectra of reactor antineutrino in TEXONO were worked out

  8. Tritium management in fusion reactors

    Energy Technology Data Exchange (ETDEWEB)

    Galloway, T.R.

    1978-05-01

    This is a review paper covering the key environmental and safety issues and how they have been handled in the various magnetic and inertial confinement concepts and reference designs. The issues treated include: tritium accident analyses, tritium process control, occupational safety, HTO formation rate from the gas-phase, disposal of tritium contaminated wastes, and environmental impact--each covering the Joint European Tokamak (J.E.T. experiment), Tokamak Fusion Test Reactor (TFTR), Russian T-20, The Next Step (TNS) designs by Westinghouse/ORNL and General Atomic/ANL, the ANL and ORNL EPR's, the G.A. Doublet Demonstration Reactor, the Italian Fintor-D and the ORNL Demo Studies. There are also the following full scale plant reference designs: UWMAK-III, LASL's Theta Pinch Reactor Design (RTPR), Mirror Fusion Reactor (MFR), Tandem Mirror Reactor (TMR), and the Mirror Hybrid Reactor (MHR). There are four laser device breakeven experiments, SHIVA-NOVA, LLL reference designs, ORNL Laser Fusion power plant, the German ''Saturn,'' and LLL's Laser Fusion EPR I and II.

  9. Innovative hybrid biological reactors using membranes; Reactores biologico hibrido innovadores utilizando membranas

    Energy Technology Data Exchange (ETDEWEB)

    Diez, R.; Esteban-Garcia, A. L.; Florio, L. de; Rodriguez-Hernandez, L.; Tejero, I.

    2011-07-01

    In this paper we present two lines of research on hybrid reactors including the use of membranes, although with different functions: RBPM, biofilm reactors and membranes filtration RBSOM, supported biofilm reactors and oxygen membranes. (Author) 14 refs.

  10. Establishment of licensing process for development reactors

    Energy Technology Data Exchange (ETDEWEB)

    Jo, Jong Chull; Yune, Young Gill; Kim, Woong Sik (and others)

    2006-02-15

    A study on licensing processes for development reactors has been performed to prepare the licensing of development reactors developed in Korea. The contents and results of the study are summarized as follows. The licensing processes for nuclear reactors in Korea, U.S.A., Japan, France, U.K., Canada, and IAEA were surveyed and analyzed to obtain technical bases necessary for establishing licensing processes applicable to development reactors in Korea. Based on the technical bases obtained the above analysis, the purpose, power output, and design characteristics of development reactors were analyzed in detail. The analysis results suggested that development reactors should be classified as a new reactor category (called as 'development reactor') separated from the current reactor categories such as the research reactor and the power reactor. Therefore, it is proposed to establish a new reactor category classified as 'development reactor' for the development reactors. And licensing processes, including licensing technical requirements, licensing document requirements, and other regulatory requirements, were also proposed for the development reactors. In order to institutionalize the licensing processes developed in this study, it is necessary to revise the current laws. Therefore, draft provisions of Atomic Energy Act, Enforcement Decree of the Atomic Energy Act, and Enforcement Regulation of the Atomic Energy Act have been developed for the preparation of the future legalization of the licensing processes proposed for the development reactors. Conclusively, a proposal of licensing processes and draft provisions of laws have been developed for the development reactors. The results proposed in this study can be applied directly to the licensing of the future development reactors. Furthermore, they will also contribute to establishing successfully the licensing processes of the development reactors.

  11. Repairing liner of the reactor; Reparacion del liner del reactor

    Energy Technology Data Exchange (ETDEWEB)

    Aguilar H, F. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    2001-07-15

    Due to the corrosion problems of the aluminum coating of the reactor pool, a periodic inspections program by ultrasound to evaluate the advance grade and the corrosion speed was settled down. This inspections have shown the necessity to repair some areas, in those that the slimming is significant, of not making it can arrive to the water escape of the reactor pool. The objective of the repair is to place patches of plates of 1/4 inch aluminum thickness in the areas of the reactor 'liner', in those that it has been detected by ultrasound a smaller thickness or similar to 3 mm. To carry out this the fuels are move (of the core and those that are decaying) to a temporary storage, the structure of the core is confined in a tank that this placed inside the pool of the reactor, a shield is placed in the thermal column and it is completely extracted the water for to leave uncover the 'liner' of the reactor. (Author)

  12. Reactor Simulator Testing

    Science.gov (United States)

    Schoenfeld, Michael P.; Webster, Kenny L.; Pearson, Boise Jon

    2013-01-01

    As part of the Nuclear Systems Office Fission Surface Power Technology Demonstration Unit (TDU) project, a reactor simulator test loop (RxSim) was design & built to perform integrated testing of the TDU components. In particular, the objectives of RxSim testing was to verify the operation of the core simulator, the instrumentation and control system, and the ground support gas and vacuum test equipment. In addition, it was decided to include a thermal test of a cold trap purification design and a pump performance test at pump voltages up to 150 V since the targeted mass flow rate of 1.75 kg/s was not obtained in the RxSim at the originally constrained voltage of 120 V. This paper summarizes RxSim testing. The gas and vacuum ground support test equipment performed effectively in NaK fill, loop pressurization, and NaK drain operations. The instrumentation and control system effectively controlled loop temperature and flow rates or pump voltage to targeted settings. The cold trap design was able to obtain the targeted cold temperature of 480 K. An outlet temperature of 636 K was obtained which was lower than the predicted 750 K but 156 K higher than the cold temperature indicating the design provided some heat regeneration. The annular linear induction pump (ALIP) tested was able to produce a maximum flow rate of 1.53 kg/s at 800 K when operated at 150 V and 53 Hz. Keywords: fission, space power, nuclear, liquid metal, NaK.

  13. Avaliação antropométrica e consumo alimentar em crianças menores de cinco anos residentes em um município da região do semiárido nordestino com cobertura parcial do programa bolsa família Anthropometric assessment and food intake of children younger than 5 years of age from a city in the semi-arid area of the Northeastern region of Brazil partially covered by the bolsa família program

    Directory of Open Access Journals (Sweden)

    Silvia Regina Dias Médici Saldiva

    2010-04-01

    Full Text Available OBJETIVO: Avaliar as condições de saúde e nutrição de crianças menores de cinco anos, e associar a qualidade do consumo alimentar aos beneficiários do Programa Bolsa Família de um município do semiárido brasileiro. MÉTODOS: Foram avaliadas 189 crianças, a partir de uma amostragem de 411 domicílios do município de João Câmara (RN. Foram realizadas medidas de peso e altura, e levantadas às condições socioeconômicas e determinação dos hábitos alimentares. Para o diagnóstico nutricional das crianças foram utilizados os indicadores Peso/Idade, Altura/Idade e Peso/Altura. Análises univariadas foram realizadas e modelos bivariados e multivariados de regressão logística foram construídos para testar a hipótese do estudo. RESULTADOS: O déficit de peso foi de 4,3% e o de altura de 9,9%, e o excesso de peso de 14,0%. Não foram encontradas diferenças estatísticas entre o estado nutricional de crianças beneficiárias e não beneficiárias do Programa Bolsa Família. Em ambos os grupos, os consumos de frutas, verduras e legumes foram baixos e semelhantes entre si. As crianças do programa bolsa família têm risco três vezes maior de consumir guloseimas (OR 3,06 - IC 1,35-6,95. CONCLUSÃO: Os resultados do padrão de consumo alimentar dessa população apontam para uma situação de "risco alimentar e nutricional", e exigem uma intervenção por parte dos profissionais de saúde para a promoção da alimentação saudável.OBJECTIVE: The objective of this study was to assess the health and nutritional status of children under five years of age and to associate the quality of the foods consumed with the Bolsa Família Program in a city located in the Brazilian semi-arid region. METHOD: A total of 189 children from a sample of 411 households in the city of João Câmara (RN were assessed. Weight and height were measured and socioeconomic and food habits were determined with the use of questionnaires. The nutritional status of

  14. Reactivity determination in accelerator driven reactors using reactor noise analysis

    Directory of Open Access Journals (Sweden)

    Kostić Ljiljana 1

    2002-01-01

    Full Text Available Feynman-alpha and Rossi-alpha methods are used in traditional nuclear reactors to determine the subcritical reactivity of a system. The methods are based on the measurement of the mean value, variance and the covariance of detector counts for different measurement times. Such methods attracted renewed attention recently with the advent of the so-called accelerator driven reactors (ADS proposed some time ago. The ADS systems, intended to be used either in energy generation or transuranium transmutation, will use a subcritical core with a strong spallation source. A spallation source has statistical properties that are different from those traditionally used by radioactive sources. In such reactors the monitoring of the subcritical reactivity is very important, and a statistical method, such as the Feynman-alpha method, is capable of resolving this problem.

  15. Evaluación de la terapia mecánica periodontal en bolsas profundas: Respuesta clínica y bacteriológica Evaluation of periodontal mechanical therapy in deep pockets: Clinical and bacteriological response

    Directory of Open Access Journals (Sweden)

    G Bazzano

    2012-12-01

    Full Text Available Objetivos: Evaluar la composición microbiológica y los parámetros clínicos de bolsas periodontales ≥5 mm de profundidad al inicio, 1 semana, 3 y 12 meses post raspado y alisado radicular. Materiales y Métodos: Se tomaron registros clínicos y muestras de placa subgingival de 44 sitios de pacientes con diagnóstico de periodontitis crónica. Se identificaron por técnica de Reacción en Cadena de la Polimerasa (PCR patógenos putativos periodontales: Aggregatibacter actinomycetemcomitans (Aa, Porphyromonas gingivalis (Pg, Treponema denticola (Td, Tannerella forsythia (Tf y Prevotella intermedia (Pi. Los pacientes recibieron terapia mecánica periodontal y fueron reevaluados a los 7 días, 3 y 12 meses. Resultados: Luego del tratamiento, todos los parámetros clínicos (Placa Bacteriana, Hemorragia, Supuración, Profundidad al Sondaje y Nivel de Inserción Clínica se redujeron significativamente y los valores obtenidos se mantuvieron hasta los 12 meses. Al inicio, las especies bacterianas prevalentes fueron Pg, presente en 66% de los sitios, Tf (55% y Td (41%. Los sitios más profundos se relacionaron con las asociaciones Tf-Td (6.8 mm y Tf-Td-Pi (7 mm. Post terapia, el número de sitios positivos para Td, Tf y Pg se redujo significativamente. Conclusiones: El raspado y alisado radicular mejoró significativamente los parámetros clínicos y redujo la prevalencia de los patógenos periodontales Pg, Tf y Td en bolsas periodontales profundas. Los resultados obtenidos se mantuvieron hasta los 12 meses. No se detectaron mayores pérdidas de inserción clínica en el 86% de los sitios a 3 meses y en 79% a los 12 meses. Los sitios en los que el tratamiento no fue efectivo en la eliminación de patógenos a los 12 meses desarrollaron mayores profundidades de sondaje.Objectives: To evaluate the microbial composition and clinical parameters of periodontal pockets with probing depth ≥5 mm at baseline, 1 week, 3 and 12 months after scaling and root

  16. Heterogeneous Transmutation Sodium Fast Reactor

    Energy Technology Data Exchange (ETDEWEB)

    S. E. Bays

    2007-09-01

    The threshold-fission (fertile) nature of Am-241 is used to destroy this minor actinide by capitalizing upon neutron capture instead of fission within a sodium fast reactor. This neutron-capture and its subsequent decay chain leads to the breeding of even neutron number plutonium isotopes. A slightly moderated target design is proposed for breeding plutonium in an axial blanket located above the active “fast reactor” driver fuel region. A parametric study on the core height and fuel pin diameter-to-pitch ratio is used to explore the reactor and fuel cycle aspects of this design. This study resulted in both non-flattened and flattened core geometries. Both of these designs demonstrated a high capacity for removing americium from the fuel cycle. A reactivity coefficient analysis revealed that this heterogeneous design will have comparable safety aspects to a homogeneous reactor of comparable size. A mass balance analysis revealed that the heterogeneous design may reduce the number of fast reactors needed to close the current once-through light water reactor fuel cycle.

  17. Thermonuclear Reflect AB-Reactor

    CERN Document Server

    Bolonkin, Alexander

    2008-01-01

    The author offers a new kind of thermonuclear reflect reactor. The remarkable feature of this new reactor is a three net AB reflector, which confines the high temperature plasma. The plasma loses part of its energy when it contacts with the net but this loss can be compensated by an additional permanent plasma heating. When the plasma is rarefied (has a small density), the heat flow to the AB reflector is not large and the temperature in the triple reflector net is lower than 2000 - 3000 K. This offered AB-reactor has significantly less power then the currently contemplated power reactors with magnetic or inertial confinement (hundreds-thousands of kW, not millions of kW). But it is enough for many vehicles and ships and particularly valuable for tunnelers, subs and space apparatus, where air to burn chemical fuel is at a premium or simply not available. The author has made a number of innovations in this reactor, researched its theory, developed methods of computation, made a sample computation of typical pr...

  18. Características estadísticas del índice general de la Bolsa de Valores de Colombia (IGBC en sus primeros 10 años

    Directory of Open Access Journals (Sweden)

    Julio César Alonso

    2014-06-01

    Full Text Available Si bien es amplia la literatura que se ha dedicado a estudiar los hechos estilizados en las series de los rendimientos, para el caso colombiano solamente existe un trabajo que documenta estos hechos. Alonso and Arcos (2006 documentaron la presencia de cuatro hechos estilizados en la serie de los rendimientos de la tasa de cambio y del principal índice accionario colombiano, empleando una muestra de rendimientos diarios para el período comprendido entre el 21 de enero de 1999 y el 31 de abril de 2005. Este documento tiene como objetivo continuar el estudio de la existencia de hechos estilizados en el comportamiento de los rendimientos del índice general de la Bolsa de Valores de Colombia (IGBC. El estudio demuestra la existencia de cinco hechos estilizados en el comportamiento de esa serie en sus primeros 10 años. Para lograr este fin, se emplea una batería amplia de pruebas estadísticas que permiten brindar evidencia de la existencia de los siguientes hechos estilizados: I No se presenta eficiencia suave del mercado; II colas pesadas de la distribución de los rendimientos; III normalidad agregada de la distribución de los rendimientos, IV volatilidad no constante y agrupada de los rendimientos y V efecto Taylor. Para el estudio se emplea una muestra del IGBC diario para los primeros años de transacciones; es decir, el período comprendido entre el 3 de julio de 2001 y el 5 de julio de 2011.

  19. Effectiveness of the Brazilian Conditional Cash Transfer Program--Bolsa Alimentação--on the variation of linear and ponderal increment in children from northeast of Brazil.

    Science.gov (United States)

    Assis, Ana Marlúcia Oliveira; Costa, Priscila Ribas de Farias; Silva, Maria da Conceição Monteiro da; Santana, Mônica Leila Portela de; Pitangueira, Jacqueline Costa Dias; Fonseca, Nedja Silva dos Santos; Pinheiro, Sandra Maria da Conceição; Santos, Sandra Maria Chaves dos

    2014-10-03

    Objetivo: Evaluar la eficacia del programa de transferencia de ingreso brasileno - Bolsa Alimentacao (PBA) sobre la variacion media del incremento del peso e de la talla de ninos. Métodos: Cohorte de 1.847 ninos fue seguida durante 12 meses: 1.615 eran ninos PBA; 232 eran ninos no PBA. Se han registrado la pierda de 316 (14,6%) ninos durante el estudio. Se adopta el diseno casi-experimental y la estrategia antes-despues con el enfoque de eficacia para evaluar el impacto del programa sobre el estado antropometrico de los ninos. La regresion lineal multinivel fue usada en el analisis estadistico. La variacion media del incremento del crecimiento de la talla y del peso para la edad fueron los outcomes and la participacion en el programa la variable de exposicion principal. Se establecieron cuatro grupos de participacion en el programa: ninos no expuesto al programa (control interno; expuestos al programa durante 12 meses de acompanamiento, expuesto al programa solo en los ultimos 6; ninos expuestos al programa solo en los primeros 6 meses. Las medidas repetidas se obtuvieron al inicio y a los 12 meses del seguimiento. Resultados: Despues de ajustar los efectos por los factores de confusion, la exposicion al programa se asocio a una variacion media de peso por edad de 0,34 Z-score (IC = -0,44- 0,63) y talla para la edad de 0,38 Z-score (IC = 0,05-0,70) para los ninos que fueron expuestos al programa durante los 12 meses. La exposicion al programa en otros periodos de seguimiento no fue estadisticamente asociado con una variacion media de peso o la talla para la edad. Conclusiones: Transferencias directas de ingreso a la familia se asociaron con la reduccion de los deficits antropometricos en la infancia.

  20. Hegemonia, consenso e coerção e os beneficiários do Programa Bolsa Família Hegemony, consensus and coercion and the beneficiaries of the Family Grant Program

    Directory of Open Access Journals (Sweden)

    Sônia Maria Ranincheski

    2013-06-01

    Full Text Available Este artigo investiga as razões da desobediência a regras impostas pelo Estado pelos beneficiários de políticas sociais, especificamente os do Programa Bolsa Família, instituído pelo Governo Federal em 2003. A investigação é feita a partir dos dados coletados em uma pesquisa qualitativa que entrevistou titulares legais de famílias que recebiam o benefício, mas que estavam em situação de descumprimento das condicionalidades. Procura compreender os elementos intrínsecos à ideologia de grupos ou indivíduos que descumprem normas sociais, mesmo sujeitos a penalidades. Problematiza a perspectiva hegemônica do Programa, baseando-se nos conceitos de hegemonia, consenso e coerção de Antonio Gramsci: o alcance e os limites das penalidades - a coerção - e o reconhecimento e a aceitação das regras - o consenso.This article investigates the reasons for disobedience of the rules imposed by the state by beneficiaries of social policies, specifically the Family Grant Program, instituted by Brazil's federal government in 2003. The investigation is based on the data collected in a qualitative study that interviewed legal heads of households who receive the benefit, but who are in a situation of non-compliance with the conditionalities. It tries to understand the elements intrinsic to the ideology of groups or individuals who do not comply with the social norms, even when subject to penalties. It analyzes the hegemonic perspective of the program, based on concepts of hegemony, consensus and coercion from Antonio Gramsci. The reach and limits of the penalties are seen as a form of coercion and the recognition and acceptance of rules as consensus.

  1. Ivermectina e abamectina em diferentes doses e vias de aplicação contra larvas de Cochliomyia hominivorax em bolsas escrotais de bovinos recém-castrados, provenientes da região sudeste do Brasil

    Directory of Open Access Journals (Sweden)

    Welber Daniel Zanetti Lopes

    2013-12-01

    Full Text Available Avaliou-se a eficácia preventiva da ivermectina e da abamectina, administradas em diferentes vias (subcutânea, intramuscular e pour-on e doses (200 e 500mcg kg-1, contra larvas de Cochliomyia hominivorax em bolsas escrotais de bovinos após a castração. Foram utilizados animais de seis propriedades do estado de São Paulo e Minas Gerais, Brasil. Para cada estudo, selecionou-se de 30 a 45 bovinos não castrados, dependendo do número de grupos. No dia zero do estudo, realizou-se o processo de castração pelo método cruento, sendo os animais tratados após este processo. Avaliou-se a eficácia da ivermectina e da abamectina administradas via pour-on (500mcg kg-1, subcutanea (200mcg kg-1, bem como a eficácia da abamectina pela via intramuscular (200mcg kg-1. Em cada experimento, um grupo de animais foi mantido como controle. Os animais foram avaliados do 3° ao 14° dia após o processo de castração/tratamento. Os valores de eficácia para ambos os princípios ativos foram ≤30% próximos ao 10° dia pós-tratamento (DPT, sendo que, em cinco experimentos, tanto a ivermectina quanto a abamectina, independente da via de administração, foram ineficazes (0,0% no 10°DPT. Com base nos resultados encontrados no presente estudo, conduzidos em diferentes propriedades da região sudeste do Brasil, tanto a ivermectina quanto a abamectina, quando utilizadas com base no protocolo apresentado, foram consideradas ineficazes na prevenção de miíases escrotais em bovinos, independente da via e dose de administração utilizada.

  2. Factores que explican la extensión de revelación de activos intangibles de los bancos que cotizan en la Bolsa de Valores de Panamá

    Directory of Open Access Journals (Sweden)

    Edila E. Herrera R.

    2013-01-01

    Full Text Available En este estudio se analiza el nivel de revelación de información voluntaria de activos intangibles; asimismo, identifica los factores que explican su divulgación por parte de los bancos que cotizan en la Bolsa de Valores de Panamá durante el periodo 2005-2009. La información es registrada en un índice que contiene 158 indicadores, distribuidos en cinco categorías: capital humano, estructural tecnológico, estructural organizativo, relacional del negocio y relacional social. Las tres hipótesis que se plantean son: H1 existe una relación positiva entre el tamaño y la extensión de revelación de información de activos intangibles; H1 existe una relación positiva entre los años de constitución y la extensión de revelación de información de activos intangibles; H1 existe una relación positiva entre el nivel de endeudamiento y la extensión de revelación de información de activos intangibles. Los resultados indican que para los bancos panameños es más importante revelar información sobre intangibles en el orden siguiente: capital relacional del negocio, relacional social, estructural organizativo, humano y estructural tecnológico. Cabe aclarar que H1 la fue aceptada excepto en la categoría capital estructural tecnológico; la H1 fue aceptada en todas sus categorías, mientras que la H1 fue rechazada.

  3. Armonización de las NIC/NIIF en las prácticas contables de entes emisores no financieros que cotizan en la Bolsa de Valores de Caracas, Venezuela

    Directory of Open Access Journals (Sweden)

    Oda Gómez

    2011-01-01

    Full Text Available Esta investigación de tipo documental y empírica tiene el propósito de analizar la armonización contable material de las Normas Internacionales de Contabilidad (nic y las Normas Internacionales de Información Financiera (niif de los entes emisores no financieros; para ello, se abordó inicialmente el proceso de aplicación de las mismas en el nivel mundial, así como el proceso correspondiente en Venezuela. Se consultó el anuario estadístico de 2007 emitido por la Bolsa de Valores de Caracas; de un total de 49 empresas que aparecen en él, veinte corresponden al sector financiero y de seguros, y veintinueve al sector no financiero; de estas últimas se obtuvieron los estados financieros auditados comparativos de los años 2007-2006 de veinticinco empresas, que fue la muestra que se analiza. El análisis de los resultados indica que para la mayoría de las unidades estudiadas, en más del 70% las prácticas de contabilidad utilizadas por las empresas objeto de estudio coinciden con las disposiciones establecidas por las nic-niif. Sin embargo, se puede observar que de los 221 atributos examinados, 48% no aplica a las empresas objeto de estudio o no aparece la información en los elementos de los estados financieros; al aplicar el índice de Jaccard son excluidos de la base de datos para determinar la similitud.

  4. MODELADO DEL PRECIO DEL CAFÉ COLOMBIANO EN LA BOLSA DE NUEVA YORK USANDO REDES NEURONALES ARTIFICIALES MODELLING OF THE COLOMBIAN COFFEE PRICE IN THE NEW YORK STOCK EXCHANGE USING ARTIFICIAL NEURAL NETWORKS

    Directory of Open Access Journals (Sweden)

    Juan David Velásquez Henao

    2007-12-01

    Full Text Available En este artículo, se modela el precio promedio mensual del café colombiano en la Bolsa de Nueva York, usando varios modelos alternativos. El modelo final seleccionado está compuesto por una componente lineal autorregresiva más una red neuronal artificial tipo perceptron multicapa con dos neuronas en la capa oculta, que permite representar la dinámica que sigue el valor esperado de la serie de precios; mientras que la dinámica de los residuales es especificada usando un proceso heterocedástico condicional autoregresivo de primer orden. Los residuales normalizados del modelo son incorrelacionados y homocedásticos, y siguen aproximadamente una distribución normal. Los resultados indican que el precio actual depende de los precios ocurridos en los últimos cuatro meses.In this paper, the monthly average price of the Colombian coffee in the New York Stock Exchange, is modelling by means of several alternative models. The preferred model is composed by a lineal autoregressive component plus a multilayer perceptron neural network with two neurons in the hidden layer, that allow us to representing the dynamic following by the expected value of the price time series; while, the dynamic of the residuals is specified by an autoregressive conditional heterocedastic model of first order. The normalized residuals of the preferred model are uncorrelated, homocedastic and are distributed following a normal distribution. The results indicate that the current price depend of the prices in the previous four months.

  5. Imaging Fukushima Daiichi reactors with muons

    Directory of Open Access Journals (Sweden)

    Haruo Miyadera

    2013-05-01

    Full Text Available A study of imaging the Fukushima Daiichi reactors with cosmic-ray muons to assess the damage to the reactors is presented. Muon scattering imaging has high sensitivity for detecting uranium fuel and debris even through thick concrete walls and a reactor pressure vessel. Technical demonstrations using a reactor mockup, detector radiation test at Fukushima Daiichi, and simulation studies have been carried out. These studies establish feasibility for the reactor imaging. A few months of measurement will reveal the spatial distribution of the reactor fuel. The muon scattering technique would be the best and probably the only way for Fukushima Daiichi to make this determination in the near future.

  6. Fast breeder reactors an engineering introduction

    CERN Document Server

    Judd, A M

    1981-01-01

    Fast Breeder Reactors: An Engineering Introduction is an introductory text to fast breeder reactors and covers topics ranging from reactor physics and design to engineering and safety considerations. Reactor fuels, coolant circuits, steam plants, and control systems are also discussed. This book is comprised of five chapters and opens with a brief summary of the history of fast reactors, with emphasis on international and the prospect of making accessible enormous reserves of energy. The next chapter deals with the physics of fast reactors and considers calculation methods, flux distribution,

  7. Hamster (Mesocricetus auratus cheek pouch as an experimental model to investigate human skin and keloid heterologous graft Bolsa jugal no hamster (Mesocricetus auratus como modelo experimental de investigação de enxertos heterólogos de pele humana e quelóide

    Directory of Open Access Journals (Sweden)

    Bernardo Hochman

    2004-12-01

    Full Text Available To describe the integration process of grafts of total human skin and keloid in hamster (Mesocricetus auratus cheek pouch, whose sub-epithelium is naturally an "Immunologically Privileged Site". Fragments of human normal skin and keloid from the breast region of mulatto female patients were transplanted into the cheek pouch subepithelium in situ. Surgical procedure and grafted pouches for microscopic exam at several time points of the transplantation were standardized. The integration of grafted fragments of human skin and keloid was seen in late periods (84 days since the microscopic assessment showed the presence of blood vases within the conjunctive tissue of grafted fragments. It was also possible to see among the grafted fragments the epithelium, the appearing of early cellular infiltrated, epithelial secretion of keratin, the presence of melanocytes, and delayed changes on the aspect of collagen fibers of conjunctive tissue. Pooled results allow to define hamster cheek pouch sub-epithelium as an experimental model to investigating heterologous graft physiology of human total skin and keloid with epithelium.Descrever a integração dos enxertos de pele total humana e quelóide na bolsa jugal do hamster (Mesocricetus auratus, cujo subepitélio é, naturalmente, um "Local de Privilégio Imunológico". Foram transplantados fragmentos, de pele humana normal e de quelóide, obtidos da região mamária de pacientes pardas, no subepitélio da bolsa jugal in situ. O procedimento operatório, e de preparo das bolsas enxertadas para exame microscópico em vários períodos de transplante, foi padronizado. Verificou-se a integração dos fragmentos enxertados de pele humana e de quelóide em períodos tardios (84 dias, uma vez que a avaliação microscópica revelou a presença de vasos sangüíneos no tecido conjuntivo dos fragmentos enxertados. Foi também possível observar, nos fragmentos enxertados, o epitélio, o aparecimento de infiltrado

  8. Plasma reactor waste management systems

    Science.gov (United States)

    Ness, Robert O., Jr.; Rindt, John R.; Ness, Sumitra R.

    1992-01-01

    The University of North Dakota is developing a plasma reactor system for use in closed-loop processing that includes biological, materials, manufacturing, and waste processing. Direct-current, high-frequency, or microwave discharges will be used to produce plasmas for the treatment of materials. The plasma reactors offer several advantages over other systems, including low operating temperatures, low operating pressures, mechanical simplicity, and relatively safe operation. Human fecal material, sunflowers, oats, soybeans, and plastic were oxidized in a batch plasma reactor. Over 98 percent of the organic material was converted to gaseous products. The solids were then analyzed and a large amount of water and acid-soluble materials were detected. These materials could possibly be used as nutrients for biological systems.

  9. Nuclear Reactor Engineering Analysis Laboratory

    Energy Technology Data Exchange (ETDEWEB)

    Carlos Chavez-Mercado; Jaime B. Morales-Sandoval; Benjamin E. Zayas-Perez

    1998-12-31

    The Nuclear Reactor Engineering Analysis Laboratory (NREAL) is a sophisticated computer system with state-of-the-art analytical tools and technology for analysis of light water reactors. Multiple application software tools can be activated to carry out different analyses and studies such as nuclear fuel reload evaluation, safety operation margin measurement, transient and severe accident analysis, nuclear reactor instability, operator training, normal and emergency procedures optimization, and human factors engineering studies. An advanced graphic interface, driven through touch-sensitive screens, provides the means to interact with specialized software and nuclear codes. The interface allows the visualization and control of all observable variables in a nuclear power plant (NPP), as well as a selected set of nonobservable or not directly controllable variables from conventional control panels.

  10. Utilisation of thorium in reactors

    Science.gov (United States)

    Anantharaman, K.; Shivakumar, V.; Saha, D.

    2008-12-01

    India's nuclear programme envisages a large-scale utilisation of thorium, as it has limited deposits of uranium but vast deposits of thorium. The large-scale utilisation of thorium requires the adoption of closed fuel cycle. The stable nature of thoria and the radiological issues associated with thoria poses challenges in the adoption of a closed fuel cycle. A thorium fuel based Advanced Heavy Water Reactor (AHWR) is being planned to provide impetus to development of technologies for the closed thorium fuel cycle. Thoria fuel has been loaded in Indian reactors and test irradiations have been carried out with (Th-Pu) MOX fuel. Irradiated thorium assemblies have been reprocessed and the separated 233U fuel has been used for test reactor KAMINI. The paper highlights the Indian experience with the use of thorium and brings out various issues associated with the thorium cycle.

  11. A tubular focused sonochemistry reactor

    Institute of Scientific and Technical Information of China (English)

    ZHOU GuangPing; LIANG ZhaoFeng; LI ZhengZhong; ZHANG YiHui

    2007-01-01

    This paper presents a new sonochemistry reactor, which consists of a cylindrical tube with a certain length and piezoelectric transducers at tube's end with the longitudinal vibration. The tube can effectively transform the longitudinal vibration into the radial vibration and thereby generates ultrasound. Furthermore, ultrasound can be focused to form high-intensity ultrasonic field inside tube. The reactor boasts of simple structure and its whole vessel wall can radiate ultrasound so that the electroacoustic transfer efficiency is high. The focused ultrasonic field provides good condition for sonochemical reaction. The length of the reactor can be up to 2 meters, and liquids can pass through it continuously, so it can be widely applied in liquid processing such as sonochemistry.

  12. A compact Tokamak transmutation reactor

    Institute of Scientific and Technical Information of China (English)

    QiuLi-Jian; XiaoBing-Jia

    1997-01-01

    The low aspect ration tokamak is proposed for the driver of a transmutation reactor.The main parameters of the reactor core,neutronic analysis of the blanket are given>the neutron wall loading can be lowered from the magnitude order of 1 MW/m2 to 0.5MW/m2 which is much easier to reach in the near future,and the transmutation efficiency (fission/absorption ratio)is raised further.The blanket power density is about 200MW/m3 which is not difficult to deal with.The key components such as diverter and center conductor post are also designed and compared with conventional TOkamak,Finally,by comparison with the other drivers such as FBR,PWR and accelerator,it can be anticipated that the low aspect ratio transmutation reactor would be one way of fusion energy applications in the near future.

  13. Investigation of KW reactor incident

    Energy Technology Data Exchange (ETDEWEB)

    Sturges, D G [USAEC Hanford Operations Office, Richland, WA (United States); Hauff, T W; Greager, O H [General Electric Co., Richland, WA (United States). Hanford Atomic Products Operation

    1955-02-11

    The new KW reactor was placed in operation on January 4, 1955, and had been running at relatively low power levels for only 17 hours when it was shut down because of a process tube water leak which appeared to be associated with a slug rupture. After several days of unrewarding effort to remove the slugs and tube by customary methods, it developed that considerable melting of the tube and slugs had taken place. It was then evident that removal of the stuck mass and repairs to the damaged tube channel would require unusual measures that were certain to extend the reactor outage for several weeks. This report documents the work and findings of the Committee which investigated the KW reactor incident. Its content represents unanimous agreement among the three Committee members.

  14. Fundamentals of Nuclear Reactor Physics

    CERN Document Server

    Lewis, E E

    2008-01-01

    This new streamlined text offers a one-semester treatment of the essentials of how the fission nuclear reactor works, the various approaches to the design of reactors, and their safe and efficient operation. The book includes numerous worked-out examples and end-of-chapter questions to help reinforce the knowledge presented. This textbook offers an engineering-oriented introduction to nuclear physics, with a particular focus on how those physics are put to work in the service of generating nuclear-based power, particularly the importance of neutron reactions and neutron behavior. Engin

  15. PITR: Princeton Ignition Test Reactor

    Energy Technology Data Exchange (ETDEWEB)

    1978-12-01

    The principal objectives of the PITR - Princeton Ignition Test Reactor - are to demonstrate the attainment of thermonuclear ignition in deuterium-tritium, and to develop optimal start-up techniques for plasma heating and current induction, in order to determine the most favorable means of reducing the size and cost of tokamak power reactors. This report describes the status of the plasma and engineering design features of the PITR. The PITR geometry is chosen to provide the highest MHD-stable values of beta in a D-shaped plasma, as well as ease of access for remote handling and neutral-beam injection.

  16. Analysis of Adiabatic Batch Reactor

    Directory of Open Access Journals (Sweden)

    Erald Gjonaj

    2016-05-01

    Full Text Available A mixture of acetic anhydride is reacted with excess water in an adiabatic batch reactor to form an exothermic reaction. The concentration of acetic anhydride and the temperature inside the adiabatic batch reactor are calculated with an initial temperature of 20°C, an initial temperature of 30°C, and with a cooling jacket maintaining the temperature at a constant of 20°C. The graphs of the three different scenarios show that the highest temperatures will cause the reaction to occur faster.

  17. External fuel thermionic reactor system.

    Science.gov (United States)

    Mondt, J. F.; Peelgren, M. L.

    1971-01-01

    Thermionic reactors are prime candidates for nuclear electric propulsion. The national thermionic reactor effort is concentrated on the flashlight concept with the external-fuel concept as the backup. The external-fuel concept is very adaptable to a completely modular power subsystem which is attractive for highly reliable long-life applications. The 20- to 25-cm long, externally-fueled converters have been designed, fabricated, and successfully tested with many thermal cycles by electrical heating. However, difficulties have been encountered during encapsulation for nuclear heated tests and none have been started to date. These nuclear tests are required to demonstrate the concept feasibility.

  18. Reactor shutdown delays medical procedures

    Science.gov (United States)

    Gwynne, Peter

    2008-01-01

    A longer-than-expected maintenance shutdown of the Canadian nuclear reactor that produces North America's entire supply of molybdenum-99 - from which the radioactive isotopes technetium-99 and iodine-131 are made - caused delays to the diagnosis and treatment of thousands of seriously ill patients last month. Technetium-99 is a key component of nuclear-medicine scans, while iodine-131 is used to treat cancer and other diseases of the thyroid. Production eventually resumed, but only after the Canadian government had overruled the Canadian Nuclear Safety Commission (CNSC), which was still concerned about the reactor's safety.

  19. Request for Naval Reactors Comment on Proposed Prometheus Space Flight Nuclear Reactor High Tier Reactor Safety Requirements and for Naval Reactors Approval to Transmit These Requirements to JPL

    Energy Technology Data Exchange (ETDEWEB)

    D. Kokkinos

    2005-04-28

    The purpose of this letter is to request Naval Reactors comments on the nuclear reactor high tier requirements for the PROMETHEUS space flight reactor design, pre-launch operations, launch, ascent, operation, and disposal, and to request Naval Reactors approval to transmit these requirements to Jet Propulsion Laboratory to ensure consistency between the reactor safety requirements and the spacecraft safety requirements. The proposed PROMETHEUS nuclear reactor high tier safety requirements are consistent with the long standing safety culture of the Naval Reactors Program and its commitment to protecting the health and safety of the public and the environment. In addition, the philosophy on which these requirements are based is consistent with the Nuclear Safety Policy Working Group recommendations on space nuclear propulsion safety (Reference 1), DOE Nuclear Safety Criteria and Specifications for Space Nuclear Reactors (Reference 2), the Nuclear Space Power Safety and Facility Guidelines Study of the Applied Physics Laboratory.

  20. Oregon State University TRIGA Reactor annual report

    Energy Technology Data Exchange (ETDEWEB)

    Anderson, T.V.; Johnson, A.G.; Bennett, S.L.; Ringle, J.C.

    1979-08-31

    The use of the Oregon State University TRIGA Reactor during the year ending June 30, 1979, is summarized. Environmental and radiation protection data related to reactor operation and effluents are included.

  1. Reactor Antineutrino Signals at Morton and Boulby

    CERN Document Server

    Dye, Steve

    2016-01-01

    Increasing the distance from which an antineutrino detector is capable of monitoring the operation of a registered reactor, or discovering a clandestine reactor, strengthens the Non-Proliferation of Nuclear Weapons Treaty. This report presents calculations of reactor antineutrino interactions, from quasi-elastic neutrino-proton scattering and elastic neutrino-electron scattering, in a water-based detector operated >10 km from a commercial power reactor. It separately calculates signal from the proximal reactor and background from all other registered reactors. The main results are interaction rates and kinetic energy distributions of charged leptons scattered from quasi-elastic and elastic processes. Comparing signal and background distributions evaluates reactor monitoring capability. Scaling the results to detectors of different sizes, target media, and standoff distances is straightforward. Calculations are for two examples of a commercial reactor (P_th~3 GW) operating nearby (L~20 km) an underground facil...

  2. Transmutation of actinides in power reactors.

    Science.gov (United States)

    Bergelson, B R; Gerasimov, A S; Tikhomirov, G V

    2005-01-01

    Power reactors can be used for partial short-term transmutation of radwaste. This transmutation is beneficial in terms of subsequent storage conditions for spent fuel in long-term storage facilities. CANDU-type reactors can transmute the main minor actinides from two or three reactors of the VVER-1000 type. A VVER-1000-type reactor can operate in a self-service mode with transmutation of its own actinides.

  3. Laminar Entrained Flow Reactor (Fact Sheet)

    Energy Technology Data Exchange (ETDEWEB)

    2014-02-01

    The Laminar Entrained Flow Reactor (LEFR) is a modular, lab scale, single-user reactor for the study of catalytic fast pyrolysis (CFP). This system can be employed to study a variety of reactor conditions for both in situ and ex situ CFP.

  4. Some new viewpoints in reactor noise analysis

    Institute of Scientific and Technical Information of China (English)

    罗征培; 李富; 等

    1996-01-01

    It is propsed that the linearity criterion and order criterion via frequency spectrum features without any limitation of the model's phase can be used in reactor noise analysis.The time constant,natural frequency as well as the recovered transfer function of reactors can bhe obtained via the analyzable model based on reactor noise.

  5. Heat-pipe thermionic reactor concept

    DEFF Research Database (Denmark)

    Storm Pedersen, E.

    1967-01-01

    Main components are reactor core, heat pipe, thermionic converter, secondary cooling system, and waste heat radiator; thermal power generated in reactor core is transported by heat pipes to thermionic converters located outside reactor core behind radiation shield; thermionic emitters are in direct...

  6. Heavy Water Reactor; Reacteurs a eau lourde

    Energy Technology Data Exchange (ETDEWEB)

    Yu, St.; HOpwood, J.; Meneley, D. [Energie Atomique du Canada (Canada)

    2000-04-01

    This document deals with the Heavy Water Reactor (HWR) technology and especially the Candu (Canada Deuterium Uranium) reactor. This reactors type offers many advantages that promote them for the future. General concepts, a description of the Candu nuclear power plants, the safety systems, the fuel cycle and economical and environmental aspects are included. (A.L.B.)

  7. Operating Modes Of Chemical Reactors Of Polymerization

    Directory of Open Access Journals (Sweden)

    Meruyert Berdieva

    2012-05-01

    Full Text Available In the work the issues of stable technological modes of operation of main devices of producing polysterol reactors have been researched as well as modes of stable operation of a chemical reactor have been presented, which enables to create optimum mode parameters of polymerization process, to prevent emergency situations of chemical reactor operation in industrial conditions.

  8. Nuclear Reactors and Technology; (USA)

    Energy Technology Data Exchange (ETDEWEB)

    Cason, D.L.; Hicks, S.C. (eds.)

    1991-01-01

    Nuclear Reactors and Technology (NRT) announces on a monthly basis the current worldwide information available from the open literature on nuclear reactors and technology, including all aspects of power reactors, components and accessories, fuel elements, control systems, and materials. This publication contains the abstracts of DOE reports, journal articles, conference papers, patents, theses, and monographs added to the Energy Science and Technology Database (EDB) during the past month. Also included are US information obtained through acquisition programs or interagency agreements and international information obtained through the International Energy Agency's Energy Technology Data Exchange or government-to-government agreements. The digests in NRT and other citations to information on nuclear reactors back to 1948 are available for online searching and retrieval on EDB and Nuclear Science Abstracts (NSA) database. Current information, added daily to EDB, is available to DOE and its contractors through the DOE integrated Technical Information System. Customized profiles can be developed to provide current information to meet each user's needs.

  9. A Simple Tubular Reactor Experiment.

    Science.gov (United States)

    Hudgins, Robert R.; Cayrol, Bertrand

    1981-01-01

    Using the hydrolysis of crystal violet dye by sodium hydroxide as an example, the theory, apparatus, and procedure for a laboratory demonstration of tubular reactor behavior are described. The reaction presented can occur at room temperature and features a color change to reinforce measured results. (WB)

  10. Silica-Immobilized Enzyme Reactors

    Science.gov (United States)

    2007-08-01

    immobilized artificial membrane chromatography and lysophospholipid micellar electrokinetic chromatography . J. Chromatogr. A 1998, 810, 95-103. 50...Journal of Liquid Chromatography and Related Technologies. Air Force Research Laboratory Materials and Manufacturing Directorate Airbase...immobilized enzyme reactors (IMERs) can also be integrated directly to further analytical methods such as liquid chromatography or mass spectrometry.[6] In

  11. British high flux beam reactor.

    Science.gov (United States)

    Egelstaff, P A

    1970-10-24

    The neutron scattering technique has become an accepted method for the study of condensed matter. Because of the great scientific and technical value of neutron experiments and the growing body of users, several proposals have been made during the past decade for a nuclear reactor devoted primarily to this technique. This article reviews the reasons for and history behind these proposals.

  12. Nuclear reactors and fuel cycle

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2014-07-01

    The Nuclear Fuel Center (CCN) of IPEN produces nuclear fuel for the continuous operation of the IEA-R1 research reactor of IPEN. The serial production started in 1988, when the first nuclear fuel element was delivered for IEA-R1. In 2011, CCN proudly presents the 100{sup th} nuclear fuel element produced. Besides routine production, development of new technologies is also a permanent concern at CCN. In 2005, U{sub 3}O{sub 8} were replaced by U{sub 3}Si{sub 2}-based fuels, and the research of U Mo is currently under investigation. Additionally, the Brazilian Multipurpose Research Reactor (RMB), whose project will rely on the CCN for supplying fuel and uranium targets. Evolving from an annual production from 10 to 70 nuclear fuel elements, plus a thousand uranium targets, is a huge and challenging task. To accomplish it, a new and modern Nuclear Fuel Factory is being concluded, and it will provide not only structure for scaling up, but also a safer and greener production. The Nuclear Engineering Center has shown, along several years, expertise in the field of nuclear, energy systems and correlated areas. Due to the experience obtained during decades in research and technological development at Brazilian Nuclear Program, personnel has been trained and started to actively participate in design of the main system that will compose the Brazilian Multipurpose Reactor (RMB) which will make Brazil self-sufficient in production of radiopharmaceuticals. The institution has participated in the monitoring and technical support concerning the safety, licensing and modernization of the research reactors IPEN/MB-01 and IEA-R1. Along the last two decades, numerous specialized services of engineering for the Brazilian nuclear power plants Angra 1 and Angra 2 have been carried out. The contribution in service, research, training, and teaching in addition to the development of many related technologies applied to nuclear engineering and correlated areas enable the institution to

  13. Heterogeneous Recycling in Fast Reactors

    Energy Technology Data Exchange (ETDEWEB)

    Forget, Benoit; Pope, Michael; Piet, Steven J.; Driscoll, Michael

    2012-07-30

    Current sodium fast reactor (SFR) designs have avoided the use of depleted uranium blankets over concerns of creating weapons grade plutonium. While reducing proliferation risks, this restrains the reactor design space considerably. This project will analyze various blanket and transmutation target configurations that could broaden the design space while still addressing the non-proliferation issues. The blanket designs will be assessed based on the transmutation efficiency of key minor actinide (MA) isotopes and also on mitigation of associated proliferation risks. This study will also evaluate SFR core performance under different scenarios in which depleted uranium blankets are modified to include minor actinides with or without moderators (e.g. BeO, MgO, B4C, and hydrides). This will be done in an effort to increase the sustainability of the reactor and increase its power density while still offering a proliferation resistant design with the capability of burning MA waste produced from light water reactors (LWRs). Researchers will also analyze the use of recycled (as opposed to depleted) uranium in the blankets. The various designs will compare MA transmutation efficiency, plutonium breeding characteristics, proliferation risk, shutdown margins and reactivity coefficients with a current reference sodium fast reactor design employing homogeneous recycling. The team will also evaluate the out-of-core accumulation and/or burn-down rates of MAs and plutonium isotopes on a cycle-by-cycle basis. This cycle-by-cycle information will be produced in a format readily usable by the fuel cycle systems analysis code, VISION, for assessment of the sustainability of the deployment scenarios.

  14. A new MTR fuel for a new MTR reactor: UMo for the Jules Horowitz reactor

    Energy Technology Data Exchange (ETDEWEB)

    Guigon, B. [CEA Cadarache, F-13108 Saint Paul lez Durance (France); Vacelet, H. [CERCA, Romans (France); Dornbusch, D. [Technicatome, Aix en Provence (France)

    2000-07-01

    Within some years, the Jules Horowitz Reactor will be the only working experimental reactor (material and fuel testing reactor) in France. It will have to provide facilities for a wide range of needs from activation analysis to power reactor fuel qualification. In this paper the main characteristics of the Jules Horowitz Reactor are presented. Safety criteria are explained. Finally, merits and disadvantages of UMo compared to the standard U{sub 3}Si{sub 2} fuel are discussed. (author)

  15. Neutrino Mixing Discriminates Geo-reactor Models

    CERN Document Server

    Dye, S T

    2009-01-01

    Geo-reactor models suggest the existence of natural nuclear reactors at different deep-earth locations with loosely defined output power. Reactor fission products undergo beta decay with the emission of electron antineutrinos, which routinely escape the earth. Neutrino mixing distorts the energy spectrum of the electron antineutrinos. Characteristics of the distorted spectrum observed at the earth's surface could specify the location of a geo-reactor, discriminating the models and facilitating more precise power measurement. The existence of a geo-reactor with known position could enable a precision measurement of the neutrino oscillation parameter delta-mass-squared.

  16. Reactor monitoring and safeguards using antineutrino detectors

    CERN Document Server

    Bowden, N S

    2008-01-01

    Nuclear reactors have served as the antineutrino source for many fundamental physics experiments. The techniques developed by these experiments make it possible to use these very weakly interacting particles for a practical purpose. The large flux of antineutrinos that leaves a reactor carries information about two quantities of interest for safeguards: the reactor power and fissile inventory. Measurements made with antineutrino detectors could therefore offer an alternative means for verifying the power history and fissile inventory of a reactors, as part of International Atomic Energy Agency (IAEA) and other reactor safeguards regimes. Several efforts to develop this monitoring technique are underway across the globe.

  17. Reactor assessments of advanced bumpy torus configurations

    Energy Technology Data Exchange (ETDEWEB)

    Uckan, N.A.; Owen, L.W.; Spong, D.A.; Miller, R.L.; Ard, W.B.; Pipkins, J.F.; Schmitt, R.J.

    1983-01-01

    Recently, several configurational approaches and concept improvement schemes were introduced for enhancing the performance of the basic ELMO Bumpy Torus (EBT) concept and for improving its reactor potential. These configurations include planar racetrack and square geometries, Andreoletti coil systems, and bumpy torus-stellarator hybrids (which include twisted racetrack and helical axis stellarator-snakey torus). Preliminary evaluations of reactor implications of each of these configurations have been carried out based on magnetics (vacuum) calculations, transport and scaling relationships, and stability properties. Results indicate favorable reactor projections with a significant reduction in reactor physical size as compared to conventional EBT reactor designs carried out in the past.

  18. Detection of antineutrinos for reactor monitoring

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Yeong Duk [Center for Underground Physics, Institute of Basic Science, Daejeon (Korea, Republic of)

    2016-04-15

    Reactor neutrinos have been detected in the past 50 years by various detectors for different purposes. Beginning in the 1980s, neutrino physicists have tried to use neutrinos to monitor reactors and develop an optimized detector for nuclear safeguards. Recently, motivated by neutrino oscillation physics, the technology and scale of reactor neutrino detection have progressed considerably. In this review, I will give an overview of the detection technology for reactor neutrinos, and describe the issues related to further improvements in optimized detectors for reactor monitoring.

  19. A Frequência Escolar e a Educação a partir do ponto de vista das Beneficiárias do Programa Bolsa Família

    Directory of Open Access Journals (Sweden)

    Feijó, Ana Paula Speck

    2015-05-01

    Full Text Available The “Programa Bolsa Família” (Family Income Program is a cash transfer policy implemented by the Brazilian federal government in 2003, which it aims to fight poverty. It benefits families with per capita income equal or inferior to R$ 140.00. The program design seeks to face the poverty by articulating actions in two periods of time. In short term, to transfer income directly to the families, acting in the reduction of the so-called absolute poverty. In long term, to fight the so-called intergenerational transmission of poverty by means of conditionality’s associated to health, and above all, education. Regarding education, it is required a minimum school attendance of 85% for children between 6 and 15 years of age, and 75% for adolescents between 16 and 17 years of age. The assumption of this understanding, which ties the transference of income to the school attendance requirement, is that children and adolescents, if entering early in the labor market, would reduce their schooling and therefore drastically reduce their chances of leaving poverty when becoming adults. This article aims to understand how the relation between school frequency and poverty output is established, according to the point of view of the very PBF beneficiary families resident in the south of Campinas municipality (SP, Brazil. The research results indicate that interviewees had no problem to fulfill the conditional education requirements, once none verbalized having had difficulty to obtain school vacancy or access for their children. Thirteen of the fifteen interviewees affirmed that their children would be in the school even if they had not been participating in the Family Allowance Program. However, the higher the children’s age, the more difficult becomes the task to fulfill the requirement, as their speech certify. Regarding the comprehension about education and the role it plays in the confrontation with poverty, the mothers express conviction that

  20. CFD Simulation on Ethylene Furnace Reactor Tubes

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    Different mathematical models for ethylene furnace reactor tubes were reviewed. On the basis of these models a new mathematical simulation approach for reactor tubes based on computational fluid dynamics (CFD) technique was presented. This approach took the flow, heat transfer, mass transfer and thermal cracking reactions in the reactor tubes into consideration. The coupled reactor model was solved with the SIMPLE algorithm. Some detailed information about the flow field, temperature field and concentration distribution in the reactor tubes was obtained, revealing the basic characteristics of the hydrodynamic phenomena and reaction behavior in the reactor tubes. The CFD approach provides the necessary information for conclusive decisions regarding the production optimization, the design and improvement of reactor tubes, and the new techniques implementation.

  1. Advanced reactor physics methods for heterogeneous reactor cores

    Science.gov (United States)

    Thompson, Steven A.

    To maintain the economic viability of nuclear power the industry has begun to emphasize maximizing the efficiency and output of existing nuclear power plants by using longer fuel cycles, stretch power uprates, shorter outage lengths, mixed-oxide (MOX) fuel and more aggressive operating strategies. In order to accommodate these changes, while still satisfying the peaking factor and power envelope requirements necessary to maintain safe operation, more complexity in commercial core designs have been implemented, such as an increase in the number of sub-batches and an increase in the use of both discrete and integral burnable poisons. A consequence of the increased complexity of core designs, as well as the use of MOX fuel, is an increase in the neutronic heterogeneity of the core. Such heterogeneous cores introduce challenges for the current methods that are used for reactor analysis. New methods must be developed to address these deficiencies while still maintaining the computational efficiency of existing reactor analysis methods. In this thesis, advanced core design methodologies are developed to be able to adequately analyze the highly heterogeneous core designs which are currently in use in commercial power reactors. These methodological improvements are being pursued with the goal of not sacrificing the computational efficiency which core designers require. More specifically, the PSU nodal code NEM is being updated to include an SP3 solution option, an advanced transverse leakage option, and a semi-analytical NEM solution option.

  2. Reactor pulse repeatability studies at the annular core research reactor

    Energy Technology Data Exchange (ETDEWEB)

    DePriest, K.R. [Applied Nuclear Technologies, Sandia National Laboratories, Mail Stop 1146, Post Office Box 5800, Albuquerque, NM 87185-1146 (United States); Trinh, T.Q. [Nuclear Facility Operations, Sandia National Laboratories, Mail Stop 0614, Post Office Box 5800, Albuquerque, NM 87185-1146 (United States); Luker, S. M. [Applied Nuclear Technologies, Sandia National Laboratories, Mail Stop 1146, Post Office Box 5800, Albuquerque, NM 87185-1146 (United States)

    2011-07-01

    The Annular Core Research Reactor (ACRR) at Sandia National Laboratories is a water-moderated pool-type reactor designed for testing many types of objects in the pulse and steady-state mode of operations. Personnel at Sandia began working to improve the repeatability of pulse operations for experimenters in the facility. The ACRR has a unique UO{sub 2}-BeO fuel that makes the task of producing repeatable pulses difficult with the current operating procedure. The ACRR produces a significant quantity of photoneutrons through the {sup 9}Be({gamma}, n){sup 8}Be reaction in the fuel elements. The photoneutrons are the result of the gammas produced during fission and in fission product decay, so their production is very much dependent on the reactor power history and changes throughout the day/week of experiments in the facility. Because the photoneutrons interfere with the delayed-critical measurements required for accurate pulse reactivity prediction, a new operating procedure was created. The photoneutron effects at delayed critical are minimized when using the modified procedure. In addition, the pulse element removal time is standardized for all pulse operations with the modified procedure, and this produces less variation in reactivity removal times. (authors)

  3. In-reactor performance of pressure tubes in CANDU reactors

    Science.gov (United States)

    Rodgers, D. K.; Coleman, C. E.; Griffiths, M.; Bickel, G. A.; Theaker, J. R.; Muir, I.; Bahurmuz, A. A.; Lawrence, S. St.; Resta Levi, M.

    2008-12-01

    The pressure tubes in CANDU reactors have been operating for times up to about 25 years. The in-reactor performance of Zr-2.5Nb pressure tubes has been evaluated by sampling and periodic inspection. This paper describes the behaviour and discusses the factors controlling the behaviour of these components in currently operating CANDU reactors. The mechanical properties (such as ultimate tensile strength, UTS, and fracture toughness), and delayed-hydride-cracking properties (crack growth rate Vc, and threshold stress intensity factor, KIH) change with irradiation; the former reach a limiting value at a fluence of Pressure tubes exhibit elongation and diametral expansion. The deformation behaviour is a function of operating conditions and material properties that vary from tube-to-tube and as a function of axial location. Semi-empirical predictive models have been developed to describe the deformation response of average tubes as a function of operating conditions. For corrosion and, more importantly deuterium pickup, semi-empirical predictive models have also been developed to represent the behaviour of an average tube. The effect of material variability on corrosion behaviour is less well defined compared with other properties. Improvements in manufacturing have increased fracture resistance by minimising trace elements, especially H and Cl, and reduced variability by tightening controls on forming parameters, especially hot-working temperatures.

  4. Fluidized bed coal combustion reactor

    Science.gov (United States)

    Moynihan, P. I.; Young, D. L. (Inventor)

    1981-01-01

    A fluidized bed coal reactor includes a combination nozzle-injector ash-removal unit formed by a grid of closely spaced open channels, each containing a worm screw conveyor, which function as continuous ash removal troughs. A pressurized air-coal mixture is introduced below the unit and is injected through the elongated nozzles formed by the spaces between the channels. The ash build-up in the troughs protects the worm screw conveyors as does the cooling action of the injected mixture. The ash layer and the pressure from the injectors support a fluidized flame combustion zone above the grid which heats water in boiler tubes disposed within and/or above the combustion zone and/or within the walls of the reactor.

  5. Nuclear reactor alignment plate configuration

    Energy Technology Data Exchange (ETDEWEB)

    Altman, David A; Forsyth, David R; Smith, Richard E; Singleton, Norman R

    2014-01-28

    An alignment plate that is attached to a core barrel of a pressurized water reactor and fits within slots within a top plate of a lower core shroud and upper core plate to maintain lateral alignment of the reactor internals. The alignment plate is connected to the core barrel through two vertically-spaced dowel pins that extend from the outside surface of the core barrel through a reinforcement pad and into corresponding holes in the alignment plate. Additionally, threaded fasteners are inserted around the perimeter of the reinforcement pad and into the alignment plate to further secure the alignment plate to the core barrel. A fillet weld also is deposited around the perimeter of the reinforcement pad. To accomodate thermal growth between the alignment plate and the core barrel, a gap is left above, below and at both sides of one of the dowel pins in the alignment plate holes through with the dowel pins pass.

  6. Transport simulation for EBT reactor

    Energy Technology Data Exchange (ETDEWEB)

    Uckan, T.; Uckan, N.A.; Jaeger, E.F.

    1983-08-01

    Transport simulation and modeling studies for the ELMO Bumpy Torus (EBT) reactor are carried out by using zero-dimensional (0-D) and one-and-one-half-dimensional (1 1/2-D) transport calculations. The time-dependent 0-D model is used for global analysis, whereas the 1 1/2-D radial transport code is used for accurate determination of density, temperature, and ambipolar potential profiles and of the role of these profiles in reactor plasma performance. Analysis with the 1 1/2-D transport code shows that profile effects near the outer edge of the hot electron ring lead to enhanced confinement by at least a factor of 2 to 5 beyond the simple scaling that is obtained from the global analysis. The radial profiles of core plasma density and temperatures (or core pressure) obtained from 1 1/2-D transport calculations are found to be similar to those theoretically required for stability.

  7. Gas-liquid autoxidation reactors

    Energy Technology Data Exchange (ETDEWEB)

    Morbidelli, M.; Paludetto, R.; Carra, S.

    1986-01-01

    A procedure for the simulation of autoxidation gas-liquid reactors has been developed based both on mathematical models and laboratory experiments. It has been shown that the complex radical chain mechanism of the autoxidation process can be simulated through two global parallel reactions, whose rates are obtained by assuming pseudo-steady-state concentration values for all the radical species involved. Using ethylbenzene autoxidation as a model reaction, an experimental analysis has been performed in order to estimate all the kinetic parameters of the model. The effect of the interaction between gas-liquid mass-transfer phenomena and the complex kinetic mechanism on the overall performance of an autoxidation reactor has been examined in detail within the framework of the liquid film model.

  8. Fast breeder reactor protection system

    Science.gov (United States)

    van Erp, J.B.

    1973-10-01

    Reactor protection is provided for a liquid-metal-fast breeder reactor core by measuring the coolant outflow temperature from each of the subassemblies of the core. The outputs of the temperature sensors from a subassembly region of the core containing a plurality of subassemblies are combined in a logic circuit which develops a scram alarm if a predetermined number of the sensors indicate an over temperature condition. The coolant outflow from a single subassembly can be mixed with the coolant outflow from adjacent subassemblies prior to the temperature sensing to increase the sensitivity of the protection system to a single subassembly failure. Coherence between the sensors can be required to discriminate against noise signals. (Official Gazette)

  9. Reactor vessel lower head integrity

    Energy Technology Data Exchange (ETDEWEB)

    Rubin, A.M.

    1997-02-01

    On March 28, 1979, the Three Mile Island Unit 2 (TMI-2) nuclear power plant underwent a prolonged small break loss-of-coolant accident that resulted in severe damage to the reactor core. Post-accident examinations of the TMI-2 reactor core and lower plenum found that approximately 19,000 kg (19 metric tons) of molten material had relocated onto the lower head of the reactor vessel. Results of the OECD TMI-2 Vessel Investigation Project concluded that a localized hot spot of approximately 1 meter diameter had existed on the lower head. The maximum temperature on the inner surface of the reactor pressure vessel (RPV) in this region reached 1100{degrees}C and remained at that temperature for approximately 30 minutes before cooling occurred. Even under the combined loads of high temperature and high primary system pressure, the TMI-2 RPV did not fail. (i.e. The pressure varied from about 8.5 to 15 MPa during the four-hour period following the relocation of melt to the lower plenum.) Analyses of RPV failure under these conditions, using state-of-the-art computer codes, predicted that the RPV should have failed via local or global creep rupture. However, the vessel did not fail; and it has been hypothesized that rapid cooling of the debris and the vessel wall by water that was present in the lower plenum played an important role in maintaining RPV integrity during the accident. Although the exact mechanism(s) of how such cooling occurs is not known, it has been speculated that cooling in a small gap between the RPV wall and the crust, and/or in cracks within the debris itself, could result in sufficient cooling to maintain RPV integrity. Experimental data are needed to provide the basis to better understand these phenomena and improve models of RPV failure in severe accident codes.

  10. The ARIES tokamak reactor study

    Energy Technology Data Exchange (ETDEWEB)

    1989-10-01

    The ARIES study is a community effort to develop several visions of tokamaks as fusion power reactors. The aims are to determine the potential economics, safety, and environmental features of a range of possible tokamak reactors, and to identify physics and technology areas with the highest leverage for achieving the best tokamak reactor. Three ARIES visions are planned, each having a different degree of extrapolation from the present data base in physics and technology. The ARIES-I design assumes a minimum extrapolation from current tokamak physics (e.g., 1st stability) and incorporates technological advances that can be available in the next 20 to 30 years. ARIES-II is a DT-burning tokamak which would operate at a higher beta in the 2nd MHD stability regime. It employs both potential advances in the physics and expected advances in technology and engineering. ARIES-II will examine the potential of the tokamak and the D{sup 3}He fuel cycle. This report is a collection of 14 papers on the results of the ARIES study which were presented at the IEEE 13th Symposium on Fusion Engineering (October 2-6, 1989, Knoxville, TN). This collection describes the ARIES research effort, with emphasis on the ARIES-I design, summarizing the major results, the key technical issues, and the central conclusions.

  11. Actinide transmutation in nuclear reactors

    Energy Technology Data Exchange (ETDEWEB)

    Bultman, J.H.

    1995-01-17

    An optimization method is developed to maximize the burning capability of the ALMR while complying with all constraints imposed on the design for reliability and safety. This method leads to a maximal transuranics enrichment, which is being limited by constraints on reactivity. The enrichment can be raised by using the neutrons less efficiently by increasing leakage from the fuel. With the developed optimization method, a metallic and an oxide fueled ALMR were optimized. Both reactors perform equally well considering the burning of transuranics. However, metallic fuel has a much higher heat conductivity coefficient, which in general leads to better safety characteristics. In search of a more effective waste transmuter, a modified Molten Salt Reactor was designed. A MSR operates on a liquid fuel salt which makes continuous refueling possible, eliminating the issue of the burnup reactivity loss. Also, a prompt negative reactivity feedback is possible for an overmoderated reactor design, even when the Doppler coefficient is positive, due to the fuel expansion with fuel temperature increase. Furthermore, the molten salt fuel can be reprocessed based on a reduction process which is not sensitive to the short-lived spontaneously fissioning actinides. (orig./HP).

  12. Assessment of the thorium fuel cycle in power reactors

    Energy Technology Data Exchange (ETDEWEB)

    Kasten, P.R.; Homan, F.J.; Allen, E.J.

    1977-01-01

    A study was conducted at Oak Ridge National Laboratory to evaluate the role of thorium fuel cycles in power reactors. Three thermal reactor systems were considered: Light Water Reactors (LWRs); High-Temperature Gas-Cooled Reactors (HTGRs); and Heavy Water Reactors (HWRs) of the Canadian Deuterium Uranium Reactor (CANDU) type; most of the effort was on these systems. A summary comparing thorium and uranium fuel cycles in Fast Breeder Reactors (FBRs) was also compiled.

  13. Investigation of molten salt fast reactor

    Energy Technology Data Exchange (ETDEWEB)

    Kubota, Kenichi; Konomura, Mamoru [Japan Nuclear Cycle Development Inst., Tokai, Ibaraki (Japan)

    2002-05-01

    On survey research for practicability strategy of fast reactor (FR) (phase 1), to extract future practicability image candidates of FR from wide options, in addition to their survey and investigation objects of not only solid fuel reactors of conventional research object but also molten salt reactor as a flowing fuel reactor, investigation on concept of molten salt FR plant was carried out. As a part of the first step of the survey research for practicability strategy, a basic concept on plant centered at nuclear reactor facility using chloride molten salt reactor capable of carrying out U-Pu cycle was examined, to perform a base construction to evaluate economical potential for a practical FBR. As a result, a result could be obtained that because of inferior fuel inventory and heat transmission to those in Na cooling reactor in present knowledge, mass of reactor vessel and intermediate heat exchanger were to widely increased to expect reduction of power generation unit price even on considering cheapness of its fuel cycle cost. Therefore, at present step further investigation on concept design of the chloride molten salt reactor plant system is too early in time, and it is at a condition where basic and elementary researches aiming at upgrading of economical efficiency such as wide reduction of fuel inventory, a measure expectable for remarkable rationalization effect of reprocessing system integrating a reactor to a processing facility, and so on. (G.K.)

  14. Estudo físico e físico-químico de diferentes filmes de bolsas de sangue visando a segurança frente ao processamento hemoterapêutico Physical and physicochemical study of different blood bag films in respect to safety during hemotherapeutic processing

    Directory of Open Access Journals (Sweden)

    Armando V. Verceze

    2006-06-01

    Full Text Available Muitas rupturas de bolsas de sangue no processamento e armazenamento levam à abertura do sistema e à perda do conteúdo, com prejuízos econômicos, riscos biológicos e aspectos sociais pela doação voluntária (dados levantados junto a serviços de hemoterapia pelo autor. O propósito foi avaliar "in vitro", por meio de teste cego, diferentes filmes de bolsas de poli (cloreto de vinila-PVC para coleta de sangue disponíveis no mercado nacional, sendo três produzidas no Brasil e duas no exterior, utilizando parâmetros físico e físico-químico. Estas bolsas possuem características especiais como: composição química conforme a Farmacopéia Européia, flexibilidade para enchimento com sangue e resistência a diferentes condições de temperatura e tempo de centrifugação. A fabricação das bolsas ocorre por soldagem por radiofreqüência. A área definida de solda ou costura entre os filmes tem sido apontada como o principal ponto vulnerável a micro-rupturas, durante a centrifugação. Os parâmetros estudados foram: absorção no infravermelho (IR-FT e análise mecânica de tensão-elongação/ruptura, realizados no corpo da bolsa e na solda ou costura. Os espectros (IR-FT foram semelhantes, porém diferentes resultados foram observados na análise mecânica quando comparados entre si. Evidenciamos dois grupos de comportamentos quanto à concentração de grupamentos químicos no infravermelho. Não obtivemos informações da concentração química, do processamento e possíveis diferenças de técnicas empregadas. Os resultados nos permitem concluir que existem diferenças entre as cinco bolsas. Estas propriedades são tão importantes quanto as características biológicas ou bioquímicas. Não encontramos na literatura valores que possam caracterizar qual bolsa seria mais ou menos eficiente frente ao processamento ao qual são submetidas em toda sua cadeia desde a indústria até a transfusão.Many ruptures of blood bags used

  15. Molten-Salt Depleted-Uranium Reactor

    CERN Document Server

    Dong, Bao-Guo; Gu, Ji-Yuan

    2015-01-01

    The supercritical, reactor core melting and nuclear fuel leaking accidents have troubled fission reactors for decades, and greatly limit their extensive applications. Now these troubles are still open. Here we first show a possible perfect reactor, Molten-Salt Depleted-Uranium Reactor which is no above accident trouble. We found this reactor could be realized in practical applications in terms of all of the scientific principle, principle of operation, technology, and engineering. Our results demonstrate how these reactors can possess and realize extraordinary excellent characteristics, no prompt critical, long-term safe and stable operation with negative feedback, closed uranium-plutonium cycle chain within the vessel, normal operation only with depleted-uranium, and depleted-uranium high burnup in reality, to realize with fission nuclear energy sufficiently satisfying humanity long-term energy resource needs, as well as thoroughly solve the challenges of nuclear criticality safety, uranium resource insuffic...

  16. Performance of a multipurpose research electrochemical reactor

    Energy Technology Data Exchange (ETDEWEB)

    Henquin, E.R. [Programa de Electroquimica Aplicada e Ingenieria Electroquimica (PRELINE), Facultad de Ingenieria Quimica, Universidad Nacional del Litoral, Santiago del Estero 2829, S3000AOM Santa Fe (Argentina); Bisang, J.M., E-mail: jbisang@fiq.unl.edu.ar [Programa de Electroquimica Aplicada e Ingenieria Electroquimica (PRELINE), Facultad de Ingenieria Quimica, Universidad Nacional del Litoral, Santiago del Estero 2829, S3000AOM Santa Fe (Argentina)

    2011-07-01

    Highlights: > For this reactor configuration the current distribution is uniform. > For this reactor configuration with bipolar connection the leakage current is small. > The mass-transfer conditions are closely uniform along the electrode. > The fluidodynamic behaviour can be represented by the dispersion model. > This reactor represents a suitable device for laboratory trials. - Abstract: This paper reports on a multipurpose research electrochemical reactor with an innovative design feature, which is based on a filter press arrangement with inclined segmented electrodes and under a modular assembly. Under bipolar connection, the fraction of leakage current is lower than 4%, depending on the bipolar Wagner number, and the current distribution is closely uniform. When a turbulence promoter is used, the local mass-transfer coefficient shows a variation of {+-}10% with respect to its mean value. The fluidodynamics of the reactor responds to the dispersion model with a Peclet number higher than 10. It is concluded that this reactor is convenient for laboratory research.

  17. Sulfide toxicity kinetics of a uasb reactor

    Directory of Open Access Journals (Sweden)

    D. R. Paula Jr.

    2009-12-01

    Full Text Available The effect of sulfide toxicity on kinetic parameters of anaerobic organic matter removal in a UASB (up-flow anaerobic sludge blanket reactor is presented. Two lab-scale UASB reactors (10.5 L were operated continuously during 12 months. The reactors were fed with synthetic wastes prepared daily using glucose, ammonium acetate, methanol and nutrient solution. One of the reactors also received increasing concentrations of sodium sulfide. For both reactors, the flow rate of 16 L.d-1 was held constant throughout the experiment, corresponding to a hydraulic retention time of 15.6 hours. The classic model for non-competitive sulfide inhibition was applied to the experimental data for determining the overall kinetic parameter of specific substrate utilization (q and the sulfide inhibition coefficient (Ki. The application of the kinetic parameters determined allows prediction of methanogenesis inhibition and thus the adoption of operating parameters to minimize sulfide toxicity in UASB reactors.

  18. Introduction to the neutron kinetics of nuclear power reactors

    CERN Document Server

    Tyror, J G; Grant, P J

    2013-01-01

    An Introduction to the Neutron Kinetics of Nuclear Power Reactors introduces the reader to the neutron kinetics of nuclear power reactors. Topics covered include the neutron physics of reactor kinetics, feedback effects, water-moderated reactors, fast reactors, and methods of plant control. The reactor transients following faults are also discussed, along with the use of computers in the study of power reactor kinetics. This book is comprised of eight chapters and begins with an overview of the reactor physics characteristics of a nuclear power reactor and their influence on system design and

  19. Microstructured reactors for hydrogen production

    Energy Technology Data Exchange (ETDEWEB)

    Aartun, Ingrid

    2005-07-01

    Small scale hydrogen production by partial oxidation (POX) and oxidative steam reforming (OSR) have been studied over Rh-impregnated microchannel Fecralloy reactors and alumina foams. Trying to establish whether metallic microchannel reactors have special advantages for hydrogen production via catalytic POX or OSR with respect to activity, selectivity and stability was of special interest. The microchannel Fecralloy reactors were oxidised at 1000 deg C to form a {alpha}-Al2O3 layer in the channels in order to enhance the surface area prior to impregnation. Kr-BET measurements showed that the specific surface area after oxidation was approximately 10 times higher than the calculated geometric surface area. Approximately 1 mg Rh was deposited in the channels by impregnation with an aqueous solution of RhCl3. Annular pieces (15 mm o.d.,4 mm i.d., 14 mm length) of extruded {alpha}-Al2O3 foams were impregnated with aqueous solutions of Rh(NO3)3 to obtain 0.01, 0.05 and 0.1 wt.% loadings, as predicted by solution uptake. ICP-AES analyses showed that the actual Rh loadings probably were higher, 0.025, 0.077 and 0.169 wt.% respectively. One of the microchannel Fecralloy reactors and all Al2O3 foams were equipped with a channel to allow for temperature measurement inside the catalytic system. Temperature profiles obtained along the reactor axes show that the metallic microchannel reactor is able to minimize temperature gradients as compared to the alumina foams. At sufficiently high furnace temperature, the gas phase in front of the Rh/Al2O3/Frecralloy microchannel reactor and the 0.025 wt.% Rh/Al2O3 foams ignites. Gas phase ignition leads to lower syngas selectivity and higher selectivity to total oxidation products and hydrocarbon by-products. Before ignition of the gas phase the hydrogen selectivity is increased in OSR as compared to POX, the main contribution being the water-gas shift reaction. After gas phase ignition, increased formation of hydrocarbon by

  20. Plasma spark discharge reactor and durable electrode

    Energy Technology Data Exchange (ETDEWEB)

    Cho, Young I.; Cho, Daniel J.; Fridman, Alexander; Kim, Hyoungsup

    2017-01-10

    A plasma spark discharge reactor for treating water. The plasma spark discharge reactor comprises a HV electrode with a head and ground electrode that surrounds at least a portion of the HV electrode. A passage for gas may pass through the reactor to a location proximate to the head to provide controlled formation of gas bubbles in order to facilitate the plasma spark discharge in a liquid environment.

  1. Experimental Breeder Reactor I Preservation Plan

    Energy Technology Data Exchange (ETDEWEB)

    Julie Braun

    2006-10-01

    Experimental Breeder Reactor I (EBR I) is a National Historic Landmark located at the Idaho National Laboratory, a Department of Energy laboratory in southeastern Idaho. The facility is significant for its association and contributions to the development of nuclear reactor testing and development. This Plan includes a structural assessment of the interior and exterior of the EBR I Reactor Building from a preservation, rather than an engineering stand point and recommendations for maintenance to ensure its continued protection.

  2. Reactor Bolshoi Moshchnosti Kalani; Reacteurs RBMK

    Energy Technology Data Exchange (ETDEWEB)

    Bastien, D. [Conservatoire National des Arts et Metiers (CNAM), 75 - Paris (France)

    2000-01-01

    The Reactor Bolshoi Molshchnosti Kalani (RBMK) are pressure tubes reactor, boiling light water cooled. Exported since 1990 from the ex-USSR, they are today in three independent countries: Russian, Ukraine and Lithuania. Since this date, data exchange with the occident allowed the better knowledge of this reactor type. The design, the technical description (core, fuel, primary system), the safety and the improvement since Chernobyl are detailed. (A.L.B.)

  3. NASA Reactor Facility Hazards Summary. Volume 1

    Science.gov (United States)

    1959-01-01

    The Lewis Research Center of the National Aeronautics and Space Administration proposes to build a nuclear research reactor which will be located in the Plum Brook Ordnance Works near Sandusky, Ohio. The purpose of this report is to inform the Advisory Committee on Reactor Safeguards of the U. S. Atomic Energy Commission in regard to the design Lq of the reactor facility, the characteristics of the site, and the hazards of operation at this location. The purpose of this research reactor is to make pumped loop studies of aircraft reactor fuel elements and other reactor components, radiation effects studies on aircraft reactor materials and equipment, shielding studies, and nuclear and solid state physics experiments. The reactor is light water cooled and moderated of the MTR-type with a primary beryllium reflector and a secondary water reflector. The core initially will be a 3 by 9 array of MTR-type fuel elements and is designed for operation up to a power of 60 megawatts. The reactor facility is described in general terms. This is followed by a discussion of the nuclear characteristics and performance of the reactor. Then details of the reactor control system are discussed. A summary of the site characteristics is then presented followed by a discussion of the larger type of experiments which may eventually be operated in this facility. The considerations for normal operation are concluded with a proposed method of handling fuel elements and radioactive wastes. The potential hazards involved with failures or malfunctions of this facility are considered in some detail. These are examined first from the standpoint of preventing them or minimizing their effects and second from the standpoint of what effect they might have on the reactor facility staff and the surrounding population. The most essential feature of the design for location at the proposed site is containment of the maximum credible accident.

  4. Heat for industry from nuclear reactors

    Energy Technology Data Exchange (ETDEWEB)

    Kikoin, I.K.; Novikov, V.M.

    Two factors which incline nations toward the use of heat from nuclear reactors for industrial use are: 1) exhaustion of cheap fossil fuel resources, and 2) ecological problems associated both with extraction of fossil fuel from the earth and with its combustion. In addition to the usual problems that beset nuclear reactors, special problems associated with using heat from nuclear reactors in various industries are explored.

  5. D-D tokamak reactor studies

    Energy Technology Data Exchange (ETDEWEB)

    Evans, K.E. Jr.; Baker, C.C.; Brooks, J.N.; Ehst, D.A.; Finn, P.A.; Jung, J.; Mattas, R.F.; Misra, B.; Smith, D.L.; Stevens, H.C.

    1980-11-01

    A tokamak D-D reactor design, utilizing the advantages of a deuterium-fueled reactor but with parameters not unnecessarily extended from existing D-T designs, is presented. Studies leading to the choice of a design and initial studies of the design are described. The studies are in the areas of plasma engineering, first-wall/blanket/shield design, magnet design, and tritium/fuel/vacuum requirements. Conclusions concerning D-D tokamak reactors are stated.

  6. Initiating Events for Multi-Reactor Plant Sites

    Energy Technology Data Exchange (ETDEWEB)

    Muhlheim, Michael David [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Flanagan, George F. [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Poore, III, Willis P. [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

    2014-09-01

    Inherent in the design of modular reactors is the increased likelihood of events that initiate at a single reactor affecting another reactor. Because of the increased level of interactions between reactors, it is apparent that the Probabilistic Risk Assessments (PRAs) for modular reactor designs need to specifically address the increased interactions and dependencies.

  7. High Performance Photocatalytic Oxidation Reactor System Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Pioneer Astronautics proposes a technology program for the development of an innovative photocatalytic oxidation reactor for the removal and mineralization of...

  8. Savannah River Site reactor safety assessment. Draft

    Energy Technology Data Exchange (ETDEWEB)

    Woody, N.D.; Brandyberry, M.D. [eds.] [Westinghouse Savannah River Co., Aiken, SC (United States); Baker, W.H.; Brandyberry, M.D.; Kearnaghan, D.P.; O`Kula, K.R.; Woody, N.D. [Westinghouse Savannah River Co., Aiken, SC (United States); Amos, C.N.; Weingardt, J.J. [Science Applications International Corp., San Diego, CA (United States)

    1991-02-28

    This report gives the results of a Savannah River Site (SRS) Production Reactor risk assessment. Measures of adverse consequences to health and safety resulting from representations of severe accidents in SRS reactors are presented. In addition, the report gives a summary of the methods employed to represent these accidents and to assess the resultant consequences. The report is issued to provide timely information to the US Department of Energy (DOE) on the risk of operation of SRS reactors, for insights into severe accident phenomena that contribute to this risk, and in support of improved bases for other Site programs in Heavy Water Reactor safety.

  9. History of fast reactor fuel development

    Energy Technology Data Exchange (ETDEWEB)

    Kittel, J.H.; Frost, B.R.T. (Argonne National Lab., IL (United States)); Mustelier, J.P. (COGEMA, Velizy-Villacoublay (France))

    1992-01-01

    Most of the first generation of fast reactors that were operated at significant power levels employed solid metal fuels. They were constructed in the United States and United Kingdom in the 1950s and included Experimental Breeder Reactor (EBR)-I and -II operated by Argonne National Laboratory, United States, the Enrico Fermi Reactor operated by the Atomic Power Development Associates, United States and DFR operated by the U.K. Atomic Energy Authority (UKAEA). Their paper tracer pre-development of fast reactor fuel from these early days through the 1980s including ceramic fuels.

  10. Advanced nuclear reactor types and technologies

    Energy Technology Data Exchange (ETDEWEB)

    Ignatiev, V. [ed.; Feinberg, O.; Morozov, A. [Russian Research Centre `Kurchatov Institute`, Moscow (Russian Federation); Devell, L. [Studsvik Eco and Safety AB, Nykoeping (Sweden)

    1995-07-01

    The document is a comprehensive world-wide catalogue of concepts and designs of advanced fission reactor types and fuel cycle technologies. Two parts have been prepared: Part 1 Reactors for Power Production and Part 2 Heating and Other Reactor Applications. Part 3, which will cover advanced waste management technology, reprocessing and disposal for different nuclear fission options is planned for compilation during 1995. The catalogue was prepared according to a special format which briefly presents the project title, technical approach, development status, application of the technology, reactor type, power output, and organization which developed these designs. Part 1 and 2 cover water cooled reactors, liquid metal fast reactors, gas-cooled reactors and molten salt reactors. Subcritical accelerator-driven systems are also considered. Various reactor applications as power production, heat generation, ship propulsion, space power sources and transmutation of such waste are included. Each project is described within a few pages with the main features of an actual design using a table with main technical data and figure as well as references for additional information. Each chapter starts with an introduction which briefly describes main trends and approaches in this field. Explanations of terms and abbreviations are provided in a glossary.

  11. Supercritical-pressure light water cooled reactors

    CERN Document Server

    Oka, Yoshiaki

    2014-01-01

    This book focuses on the latest reactor concepts, single pass core and experimental findings in thermal hydraulics, materials, corrosion, and water chemistry. It highlights research on supercritical-pressure light water cooled reactors (SCWRs), one of the Generation IV reactors that are studied around the world. This book includes cladding material development and experimental findings on heat transfer, corrosion and water chemistry. The work presented here will help readers to understand the fundamental elements of reactor design and analysis methods, thermal hydraulics, materials and water

  12. Sandia National Laboratories Medical Isotope Reactor concept.

    Energy Technology Data Exchange (ETDEWEB)

    Coats, Richard Lee; Dahl, James J.; Parma, Edward J., Jr.

    2010-04-01

    This report describes the Sandia National Laboratories Medical Isotope Reactor and hot cell facility concepts. The reactor proposed is designed to be capable of producing 100% of the U.S. demand for the medical isotope {sup 99}Mo. The concept is novel in that the fuel for the reactor and the targets for the {sup 99}Mo production are the same. There is no driver core required. The fuel pins that are in the reactor core are processed on a 7 to 21 day irradiation cycle. The fuel is low enriched uranium oxide enriched to less than 20% {sup 235}U. The fuel pins are approximately 1 cm in diameter and 30 to 40 cm in height, clad with Zircaloy (zirconium alloy). Approximately 90 to 150 fuel pins are arranged in the core in a water pool {approx}30 ft deep. The reactor power level is 1 to 2 MW. The reactor concept is a simple design that is passively safe and maintains negative reactivity coefficients. The total radionuclide inventory in the reactor core is minimized since the fuel/target pins are removed and processed after 7 to 21 days. The fuel fabrication, reactor design and operation, and {sup 99}Mo production processing use well-developed technologies that minimize the technological and licensing risks. There are no impediments that prevent this type of reactor, along with its collocated hot cell facility, from being designed, fabricated, and licensed today.

  13. NCSU reactor sharing program. Final technical report

    Energy Technology Data Exchange (ETDEWEB)

    Perez, P.B.

    1997-01-10

    The Nuclear Reactor Program at North Carolina State University provides the PULSTAR Research Reactor and associated facilities to eligible institutions with support, in part, from the Department of Energy Reactor Sharing Program. Participation in the NCSU Reactor Sharing Program continues to increase steadily with visitors ranging from advance high school physics and chemistry students to Ph.D. level research from neighboring universities. This report is the Final Technical Report for the DOE award reference number DE-FG05-95NE38136 which covers the period September 30, 1995 through September 30, 1996.

  14. Molecular ecology of anaerobic reactor systems

    DEFF Research Database (Denmark)

    Hofman-Bang, H. Jacob Peider; Zheng, D.; Westermann, Peter;

    2003-01-01

    Anaerobic reactor systems are essential for the treatment of solid and liquid wastes and constitute a core facility in many waste treatment plants. Although much is known about the basic metabolism in different types of anaerobic reactors, little is known about the microbes responsible...... to the abundance of each microbe in anaerobic reactor systems by rRNA probing. This chapter focuses on various molecular techniques employed and problems encountered when elucidating the microbial ecology of anaerobic reactor systems. Methods such as quantitative dot blot/fluorescence in-situ probing using various...

  15. Advances in light water reactor technologies

    CERN Document Server

    Saito, Takehiko; Ishiwatari, Yuki; Oka, Yoshiaki

    2010-01-01

    ""Advances in Light Water Reactor Technologies"" focuses on the design and analysis of advanced nuclear power reactors. This volume provides readers with thorough descriptions of the general characteristics of various advanced light water reactors currently being developed worldwide. Safety, design, development and maintenance of these reactors is the main focus, with key technologies like full MOX core design, next-generation digital I&C systems and seismic design and evaluation described at length. This book is ideal for researchers and engineers working in nuclear power that are interested

  16. Nanostructured Catalytic Reactors for Air Purification Project

    Data.gov (United States)

    National Aeronautics and Space Administration — This SBIR Phase I project proposes the development of lightweight compact nanostructured catalytic reactors for air purification from toxic gaseous organic...

  17. Phosphorus removal in aerated stirred tank reactor

    Energy Technology Data Exchange (ETDEWEB)

    Ghigliazza, R.; Lodi, A.; Rovatti, M. [Inst. of Chemical and Process Engineering ``G.B. Bonino``, Univ. of Genoa (Italy)

    1999-03-01

    The possibility to obtain biological phosphorus removal in strictly aerobic conditions has been investigated. Experiments, carried out in a continuous stirred tank reactor (CSTR), show the feasibility to obtain phosphorus removal without the anaerobic phase. Reactor performance in terms of phosphorus abatement kept always higher then 65% depending on adopted sludge retention time (SRT). In fact increasing SRT from 5 days to 8 days phosphorus removal and reactor performance increase but overcoming this SRT value a decreasing in reactor efficiency was recorded. (orig.) With 6 figs., 3 tabs., 18 refs.

  18. Sodium fast reactors with closed fuel cycle

    CERN Document Server

    Raj, Baldev; Vasudeva Rao, PR 0

    2015-01-01

    Sodium Fast Reactors with Closed Fuel Cycle delivers a detailed discussion of an important technology that is being harnessed for commercial energy production in many parts of the world. Presenting the state of the art of sodium-cooled fast reactors with closed fuel cycles, this book:Offers in-depth coverage of reactor physics, materials, design, safety analysis, validations, engineering, construction, and commissioning aspectsFeatures a special chapter on allied sciences to highlight advanced reactor core materials, specialized manufacturing technologies, chemical sensors, in-service inspecti

  19. Autonomous Control of Space Nuclear Reactors Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Nuclear reactors to support future robotic and manned missions impose new and innovative technological requirements for their control and protection instrumentation....

  20. Neutron imaging on the VR-1 reactor

    Science.gov (United States)

    Crha, J.; Sklenka, L.; Soltes, J.

    2016-09-01

    Training reactor VR-1 is a low power research reactor with maximal thermal power of 1 kW. The reactor is operated by the Faculty of Nuclear Science and Physical Engineering of the Czech Technical University in Prague. Due to its low power it suits as a tool for education of university students and training of professionals. In 2015, as part of student research project, neutron imaging was introduced as another type of reactor utilization. The low available neutron flux and the limiting spatial and construction capabilities of the reactor's radial channel led to the development of a special filter/collimator insertion inside the channel and choosing a nonstandard approach by placing a neutron imaging plate inside the channel. The paper describes preliminary experiments carried out on the VR-1 reactor which led to first radiographic images. It seems, that due to the reactor construction and low reactor power, the neutron imaging technique on the VR-1 reactor is feasible mainly for demonstration or educational and training purposes.

  1. Microchannel Methanation Reactors Using Nanofabricated Catalysts Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Makel Engineering, Inc. (MEI) and the Pennsylvania State University (Penn State) propose to develop and demonstrate a microchannel methanation reactor based on...

  2. Nanostructured Catalytic Reactors for Air Purification Project

    Data.gov (United States)

    National Aeronautics and Space Administration — This SBIR Phase II project proposes the development of lightweight compact nanostructured catalytic reactors for air purification from toxic gaseous organic...

  3. Continuous steroid biotransformations in microchannel reactors.

    Science.gov (United States)

    Marques, Marco P C; Fernandes, Pedro; Cabral, Joaquim M S; Znidaršič-Plazl, Polona; Plazl, Igor

    2012-01-15

    The use of microchannel reactor based technologies within the scope of bioprocesses as process intensification and production platforms is gaining momentum. Such trend can be ascribed a particular set of characteristics of microchannel reactors, namely the enhanced mass and heat transfer, combined with easier handling and smaller volumes required, as compared to traditional reactors. In the present work, a continuous production process of 4-cholesten-3-one by the enzymatic oxidation of cholesterol without the formation of any by-product was assessed. The production was carried out within Y-shaped microchannel reactors in an aqueous-organic two-phase system. Substrate was delivered from the organic phase to aqueous phase containing cholesterol oxidase and the product formed partitions back to the organic phase. The aqueous phase was then forced through a plug-flow reactor, containing immobilized catalase. This step aimed at the reduction of hydrogen peroxide formed as a by-product during cholesterol oxidation, to avoid cholesterol oxidase deactivation due to said by-product. This setup was compared with traditional reactors and modes of operation. The results showed that microchannel reactor geometry outperformed traditional stirred tank and plug-flow reactors reaching similar conversion yields at reduced residence time. Coupling the plug-flow reactor containing catalase enabled aqueous phase reuse with maintenance of 30% catalytic activity of cholesterol oxidase while eliminating hydrogen peroxide. A final production of 36 m of cholestenone was reached after 300 hours of operation.

  4. Microorganismos inusuales en surcos y bolsas periodontales.

    Directory of Open Access Journals (Sweden)

    Marisol Betancourth

    2009-11-01

    Full Text Available Introducción: Los microorganismos de la familia Enterobacteriaceae, los bacilos Gram negativos no fermentadores y ciertas especies de Candida se han considerado como inusuales en quienes sufren enfermedad periodontal, y en ellos el tratamiento mecánico o antimicrobiano puede ser poco efectivo para resolver o controlar la progresión de la enfermedad. Objetivos: Analizar los perfiles microbiológicos en individuos sanos y en pacientes con diagnóstico de periodontitis crónica y periodontitis agresiva, determinar la frecuencia de los microorganismos inusuales y las posibles asociaciones con algunos microorganismos periodontopáticos en la base de datos del laboratorio de microbiología oral y periodontal en Cali. Materiales y métodos: Se estudiaron los informes microbiológicos de 356 pacientes en un período de 41 meses. Las variables analizadas fueron: diagnóstico periodontal, recuento total de colonias, porcentaje de aislamiento de diez microorganismos periodontopáticos y de otros inusuales como miembros de la familia Enterobacteriaceae, bacilos Gram negativos no fermentadores y levaduras. Resultados: Se analizaron 202 (56.7% informes de pacientes con periodontitis crónica, 139 (39.1% de periodontitis agresiva y 15 (4.2% de individuos periodontalmente sanos. La presencia de microorganismos inusuales de tipo entérico fue 36% y la prevalencia de levaduras 7% en las personas con periodontitis. No se encontraron diferencias significantes entre los tres diagnósticos clínicos con respecto a la presencia de microorganismos entéricos y levaduras. La mayor prevalencia de organismos entéricos correspondió a los géneros Klebsiella, Enterobacter y a bacilos Gram negativos no fermentadores. Se encontraron asociaciones estadísticamente significativas entre la presencia o ausencia de microorganismos infrecuentes con la de algunos microorganismos periodontopáticos en los individuos con enfermedad periodontal. Discusión y conclusiones: La microbiota inusuales de los pacientes incluidos en este estudio presentó una mayor proporción de bacilos Gram negativos entéricos. Las bacterias entéricas encontradas se caracterizan por ser agentes oportunistas para el hombre. Se requieren más estudios para determinar el papel que los microorganismos inusuales pueden tener en la patogénesis y/o progresión de la enfermedad periodontal.

  5. Microorganismos inusuales en surcos y bolsas periodontales

    OpenAIRE

    Marisol Betancourth; Roger Mauricio Arce; Javier Botero; Adriana Jaramillo; Carlos Cruz; Adolfo Contreras

    2006-01-01

    Introducción: Los microorganismos de la familia Enterobacteriaceae, los bacilos Gram negativos no fermentadores y ciertas especies de Candida se han considerado como inusuales en quienes sufren enfermedad periodontal, y en ellos el tratamiento mecánico o antimicrobiano puede ser poco efectivo para resolver o controlar la progresión de la enfermedad. Objetivos: Analizar los perfiles microbiológicos en individuos sanos y en pacientes con diagnóstico de periodontitis crónica y periodontitis agre...

  6. Reactors for nuclear electric propulsion

    Energy Technology Data Exchange (ETDEWEB)

    Buden, D.; Angelo, J.A. Jr.

    1981-01-01

    Propulsion is the key to space exploitation and power is the key to propulsion. This paper examines the role of nuclear fission reactors as the primary power source for high specific impulse electric propulsion systems for space missions of the 1980s and 1990s. Particular mission applications include transfer to and a reusable orbital transfer vehicle from low-Earth orbit to geosynchronous orbit, outer planet exploration and reconnaissance missions, and as a versatile space tug supporting lunar resource development. Nuclear electric propulsion is examined as an indispensable component in space activities of the next two decades.

  7. Biodegradation of MTBE in reactors

    DEFF Research Database (Denmark)

    Waul, Christopher Kevin

    2007-01-01

    The fuel oxygenate methyl tert-butyl ether (MTBE) was first introduced in the 1970’s to improve gasoline combustion efficiency and reduce emission of harmful gases. However, it has caused groundwater contamination in Denmark and in many locations worldwide through accidental releases from leaking...... such as ammonium or benzene, toluene, ethyl benzene and xylene (BTEX) oxidizers, which can be present together in a single system. The competition resulted in reduced and/or delayed degradation of MTBE when there were limitations of oxygen or space in the reactor. The fraction of biologically active (BA) MTBE...

  8. Concepções de conhecimento escolar: potencialidades do Programa Institucional de Bolsa de Iniciação à Docência Concepts of school knowledge: potentialities of the Institutional Program of Teaching Initiation Scholarships

    Directory of Open Access Journals (Sweden)

    Andréa Rosana Fetzner

    2012-09-01

    Full Text Available Considerando-se as possibilidades abertas por meio do Programa Institucional de Bolsa de Iniciação à Docência (PIBID, o presente artigo discute as concepções de conhecimento escolar e os desafios de um projeto de transformação da escola básica em uma instituição que assuma perspectivas interculturais em relação ao conhecimento escolar. Nesse sentido, compreende-se que ainda é um desafio, para muitas escolas de ensino fundamental, reconhecer e trabalhar com conhecimentos que sejam significativos para a população que as frequenta. Apoiado pela CAPES, no âmbito do PIBID, este trabalho apresenta os resultados iniciais de um estudo sobre as concepções de conhecimento escolar que permeiam os saberes da docência de professores de escolas públicas e de bolsistas de iniciação à docência envolvidos no projeto. O desenvolvimento da pesquisa deu-se mediante o estudo da interculturalidade e de seus desafios contemporâneos, o acompanhamento do trabalho desenvolvido nas escolas e a aplicação de questionários a estudantes bolsistas de iniciação à docência da Universidade Federal do Estado do Rio de Janeiro (UNIRIO, que desenvolvem um projeto por meio do referido programa. Observamos, até o presente momento, que a concepção de conhecimento escolar tem oscilado entre perspectivas conservadoras e perspectivas emancipatórias, sendo estas últimas entendidas como aquelas que, compartilhando do conceito de bem viver, procuram integrar-se às necessidades das comunidades e compartilhar de princípios que envolvem a relacionalidade, a correspondência e a complementariedade, tal como salienta Catherine Walsh.Considering the possibilities resulting from the Institutional Program of Teaching Initiation Scholarships (PIBID, this paper discusses the concepts of school knowledge and the challenges of project to transform basic schooling into an institution that takes intercultural perspectives in relation to school knowledge. Thus, it is

  9. Coupled reactor kinetics and heat transfer model for heat pipe cooled reactors

    Science.gov (United States)

    Wright, Steven A.; Houts, Michael

    2001-02-01

    Heat pipes are often proposed as cooling system components for small fission reactors. SAFE-300 and STAR-C are two reactor concepts that use heat pipes as an integral part of the cooling system. Heat pipes have been used in reactors to cool components within radiation tests (Deverall, 1973); however, no reactor has been built or tested that uses heat pipes solely as the primary cooling system. Heat pipe cooled reactors will likely require the development of a test reactor to determine the main differences in operational behavior from forced cooled reactors. The purpose of this paper is to describe the results of a systems code capable of modeling the coupling between the reactor kinetics and heat pipe controlled heat transport. Heat transport in heat pipe reactors is complex and highly system dependent. Nevertheless, in general terms it relies on heat flowing from the fuel pins through the heat pipe, to the heat exchanger, and then ultimately into the power conversion system and heat sink. A system model is described that is capable of modeling coupled reactor kinetics phenomena, heat transfer dynamics within the fuel pins, and the transient behavior of heat pipes (including the melting of the working fluid). This paper focuses primarily on the coupling effects caused by reactor feedback and compares the observations with forced cooled reactors. A number of reactor startup transients have been modeled, and issues such as power peaking, and power-to-flow mismatches, and loading transients were examined, including the possibility of heat flow from the heat exchanger back into the reactor. This system model is envisioned as a tool to be used for screening various heat pipe cooled reactor concepts, for designing and developing test facility requirements, for use in safety evaluations, and for developing test criteria for in-pile and out-of-pile test facilities. .

  10. Compound cryopump for fusion reactors

    CERN Document Server

    Kovari, M; Shephard, T

    2013-01-01

    We reconsider an old idea: a three-stage compound cryopump for use in fusion reactors such as DEMO. The helium "ash" is adsorbed on a 4.5 K charcoal-coated surface, while deuterium and tritium are adsorbed at 15-22 K on a second charcoal-coated surface. The helium is released by raising the first surface to ~30 K. In a separate regeneration step, deuterium and tritium are released at ~110 K. In this way, the helium can be pre-separated from other species. In the simplest design, all three stages are in the same vessel, with a single valve to close the pump off from the tokamak during regeneration. In an alternative design, the three stages are in separate vessels, connected by valves, allowing the stages to regenerate without interfering with each other. The inclusion of the intermediate stage would not affect the overall pumping speed significantly. The downstream exhaust processing system could be scaled down, as much of the deuterium and tritium could be returned directly to the reactor. This could reduce ...

  11. K-East and K-West Reactors

    Data.gov (United States)

    Federal Laboratory Consortium — Hanford's "sister reactors", the K-East and the K-West Reactors, were built side-by-side in the early 1950's. The two reactors went operational within four months of...

  12. ADHERENCE LEVEL OF PROJECTS SUPPORTED BY BRAZILIAN RESEARCH AND TECHNOLOGY COUNCIL (CNPq, RESEARCH PRODUCTIVITY SCHOLARSHIP PROGRAM AND MILK TECHNOLOGIC PLATAFORM PROJECT ADERÊNCIA DOS PROJETOS APOIADOS PELO CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPq, BOLSAS DE PRODUTIVIDADE EM PESQUISA E O PROJETO PLATAFORMA TECNOLÓGICA DO LEITE

    Directory of Open Access Journals (Sweden)

    Rui da Silva Verneque

    2007-12-01

    Full Text Available

    The objective of this work was to determine the adherence level of the CNPq supporting projects, using the Research Productivity Scholarship Program (RPSP, in to the Veterinary Medicine, Animal Science, Food Science, and the sub area Rural Technology Transference, concerned to the Milk-Chain activities, with the solution propose to the technologic problems presents in the Milk Technologic Platform Project (MTPP. A content analysis, based in key-words, was conduced to group the RPSP. The study was done in the industrial and production segments. The results suggest a good correlation among the Research Productivity Scholarship Program and the solution pro-pose by the Platform Project. Wherever, there are strategic areas to the national development that presented inexpres-sive adherence among RPS and MTPP solution proposes. Each region showed its particularity, as to industrial as to production segment, suggesting a different politics strategies between the segments.

    Key-words: Adherence levels, public politics,  technological limitations.

    O trabalho foi realizado com o objetivo de analisar a aderência dos projetos financiados pelo CNPq, por meio de bolsas de Produtividade em Pesquisa (Pq, nos Programas de Medicina Veterinária, Zootecnia, Ciência dos Alimentos e subárea Extensão Rural, voltadas à cadeia agroalimentar do leite, com as soluções para os gargalos tecnológicos apontados no Projeto Plataforma Tecnológica do Leite (PL. A finalidade é agrupar as bolsas de produtividade em pesquisa concedidas pelo CNPq, limitadas ao título dos projetos, temas e propostas de solução do projeto Plataforma Tecnológica do Leite nos segmentos da produção e indústria da cadeia produtiva do leite, por região geoeconômica, criando uma escala de aderência. Verificou-se que, de modo geral, as bolsas de produtividade em pesquisa financiadas pelo CNPq estão adequadas às propostas de solu

  13. A new MTR fuel for a new MTR reactor: UMo for the Jules Horowitz reactor

    Energy Technology Data Exchange (ETDEWEB)

    Guigon, B. [CEA Cadarache, Dir. de l' Energie Nucleaire DEN, Reacteur Jules Horowitz, 13 - Saint-Paul-lez-Durance (France); Vacelet, H. [Compagnie pour l' Etude et la Realisation de Combustibles Atomiques, CERCA, Etablissement de Romans, 26 (France); Dornbusch, D. [Technicatome, Service d' Architecture Generale, 13 - Aix-en-Provence (France)

    2003-07-01

    Within some years, the Jules Horowitz Reactor will be the only working experimental reactor (material and fuel testing reactor) in France. It will have to provide facilities for a wide range of needs: from activation analysis to power reactor fuel qualification. In this paper will be presented the main characteristics of the Jules Horowitz Reactor: its total power, neutron flux, fuel element... Safety criteria will be explained. Finally merits and disadvantages of UMo compared to the standard U{sub 3}Si{sub 2} fuel will be discussed. (authors)

  14. Annual report on JEN-1 reactor; Informe periodico del Reactor JEN-1 correspondiente al ano 1971

    Energy Technology Data Exchange (ETDEWEB)

    Montes, J.

    1972-07-01

    In the annual report on the JEN-1 reactor the main features of the reactor operations and maintenance are described. The reactor has been critical for 1831 hours, what means 65,8% of the total working time. Maintenance and pool water contamination have occupied the rest of the time. The maintenance schedule is shown in detail according to three subjects. The main failures and reactor scrams are also described. The daily maximum values of the water activity are given so as the activity of the air in the reactor hall. (Author)

  15. Empresas brasileiras revelam as informações ambientais? Evidências de declarações financeiras publicadas no ‘New York Securities Exchange’ (NYSE e na Bolsa de Valores de São Paulo (BOVESPA = Do Brazilian Corporations Disclose Environmental Information? Evidences from Financial Statements Published in the New York Securities Exchange (NYSE and in the Bolsa de Valores de São Paulo (BOVESPA

    Directory of Open Access Journals (Sweden)

    José Alonso Borba

    2008-11-01

    Full Text Available O presente estudo, de caráter exploratório-descritivo, tem como objetivo examinar a divulgação de informações ambientais pelas empresas brasileiras, tanto no âmbito nacional(BOVESPA quanto no âmbito norte-americano (NYSE. Para isso, analisaram-se as demonstrações contábeis durante o período de 2002-2004. A amostra do estudo é composta pelas empresas listadas na Bolsa de Valores de Nova York, pertencentes a setores de médio e alto impacto ambiental segundo a Lei 10.165/2000, que trata das Políticas Nacionais de Meio Ambiente. Das três hipóteses inicialmente formuladas, apenas uma se confirmou: as empresas analisadas estão evidenciando um maior volume de informações relacionadas ao meio ambiente. Contudo, percebe-se que existem diferenças entre as informações divulgadas no Brasil e nos Estados Unidos. As empresas analisadas evidenciaram um maior volume de informação no âmbito internacional. Com relação aos passivos ambientais, apenas duas empresas evidenciaram informações específicas. Embora poucas empresas tenham sido analisadas, os resultados levantam questões sobre a credibilidade das informações de caráter ambiental e alertam para a possibilidade de gerenciamento do que é divulgado pelas empresas.This study adopts an exploratory-descriptive approach in order to examine environmentalinformation published by Brazilian corporations. A comparison between the environmentalinformation disclosured in the Brazilian Market (BOVESPA and the United States Market(NYSE was conducted. A content analysis has been carried out in corporate financialstatements for the period of 2002-2004. The sample was composed by Brazilian corporationslisted in the New York Stock Exchange that were members of industries (sectors with highand medium pollution potential according to the Brazilian Law 10.165/2000. Of the threehypotheses initially formulated, only one was confirmed: the amount of environmentalinformation disclosured by

  16. O direito de participar da riqueza da nação: do Programa Bolsa Família à Renda Básica de Cidadania The right to share in the nation's wealth: from the Family Allowance Program to Basic Citizenship Income

    Directory of Open Access Journals (Sweden)

    Eduardo Matarazzo Suplicy

    2007-12-01

    Full Text Available O trabalho apresenta os resultados positivos do Programa Bolsa Família no combate à fome e a erradicação da pobreza, ressaltando que o Bolsa Família constituí-se na primeira etapa para a implantação da Renda Básica de Cidadania - RBC, no Brasil, conforme previsto pela Lei 10.835 de 2004. A RBC será instituída por etapas, a critério do Poder Executivo, começando pelos mais necessitados. Será o direito de todas as pessoas, incondicionalmente, receberem uma renda que, na medida do possível, será suficiente para atender as suas necessidades vitais. Não se trata de uma caridade ou uma assistência, mas de um direito de todos participarem da riqueza da nação. A racionalidade deste instrumento para garantir real liberdade e dignidade a todos é também aqui analisada.This paper presents the positive outcomes of Brazil's Family Allowance Program, in terms of combating hunger and eradicating poverty, stressing that this is the first step towards introducing a Basic Income for Citizenship (RBC - Renda Básica de Cidadania in Brazil, as established in 2004 through Law N° 10,835. This Basic Income for Citizenship will be phased in by stages at the discretion of the Executive Branch, starting with the neediest segments of the population. Everyone will be endowed with the unconditional right to receive an income that will be sufficient - as far as possible - to cover vital requirements. This is not a matter of charity or welfare, but rather an across-the-board right to share in the wealth of the nation. The rationality of this tool for ensuring real freedom and dignity for all is also examined here.

  17. Selective purge for hydrogenation reactor recycle loop

    Science.gov (United States)

    Baker, Richard W.; Lokhandwala, Kaaeid A.

    2001-01-01

    Processes and apparatus for providing improved contaminant removal and hydrogen recovery in hydrogenation reactors, particularly in refineries and petrochemical plants. The improved contaminant removal is achieved by selective purging, by passing gases in the hydrogenation reactor recycle loop or purge stream across membranes selective in favor of the contaminant over hydrogen.

  18. Radiochemical problems of fusion reactors. 1. Facilities

    Energy Technology Data Exchange (ETDEWEB)

    Crespi, M.B.A.

    1984-02-01

    A list of fusion reactor candidate materials is given, for use in connection with blanket structure, breeding, moderation, neutron multiplication, cooling, magnetic field generation, electrical insulation and radiation shielding. The phenomena being studied for each group of materials are indicated. Suitable irradiation test facilities are discussed under the headings (1) accelerator-based neutron sources, (2) fission reactors, and (3) ion accelerators.

  19. Advanced tokamak concepts and reactor designs

    NARCIS (Netherlands)

    Oomens, A. A. M.

    2000-01-01

    From a discussion of fusion reactor designs based on today's well-established experience gained in the operation of large tokamaks, it is concluded that such reactors are economically not attractive. The physics involved in the various options for concept improvement is described, some examples

  20. Startup of an industrial adiabatic tubular reactor

    NARCIS (Netherlands)

    Verwijs, J.W.; Berg, van den H.; Westerterp, K.R.

    1992-01-01

    The dynamic behaviour of an adiabatic tubular plant reactor during the startup is demonstrated, together with the impact of a feed-pump failure of one of the reactants. A dynamic model of the reactor system is presented, and the system response is calculated as a function of experimentally-determine

  1. Rotor for a pyrolysis centrifuge reactor

    DEFF Research Database (Denmark)

    2015-01-01

    The present invention relates to a rotor for a pyrolysis centrifuge reactor, said rotor comprising a rotor body having a longitudinal centre axis, and at least one pivotally mounted blade being adapted to pivot around a pivot axis under rotation of the rotor body around the longitudinal centre axis....... Moreover, the present invention relates to a pyrolysis centrifuge reactor applying such a rotor....

  2. Helix reactor: great potential for flow chemistry

    NARCIS (Netherlands)

    Geerdink, P.; Runstraat, A. van den; Roelands, C.P.M.; Goetheer, E.L.V.

    2009-01-01

    The Helix reactor is highly suited for precise reaction control based on good hydrodynamics. The hydrodynamics are controlled by the Dean vortices, which create excellent heat transfer properties, approach plug flow and avoid turbulence. The flexibility of this reactor has been demonstrated using a

  3. The Design of a Nuclear Reactor

    Indian Academy of Sciences (India)

    2016-09-01

    The aim of this largely pedagogical article is toemploy pre-college physics to arrive at an understanding of a system as complex as a nuclear reactor. We focus on three key issues: the fuelpin, the moderator, and lastly the dimensions ofthe nuclear reactor.

  4. Design of an organic simplified nuclear reactor

    Energy Technology Data Exchange (ETDEWEB)

    Shirvan, Koroush [Dept. of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge (United States); Forrest, Eric [Primary Standards Laboratory, Sandia National Laboratories, Albuquerque (United States)

    2016-08-15

    Numerous advanced reactor concepts have been proposed to replace light water reactors ever since their establishment as the dominant technology for nuclear energy production. While most designs seek to improve cost competitiveness and safety, the implausibility of doing so with affordable materials or existing nuclear fuel infrastructure reduces the possibility of near-term deployment, especially in developing countries. The organic nuclear concept, first explored in the 1950s, offers an attractive alternative to advanced reactor designs being considered. The advent of high temperature fluids, along with advances in hydrocracking and reforming technologies driven by the oil and gas industries, make the organic concept even more viable today. We present a simple, cost-effective, and safe small modular nuclear reactor for offshore underwater deployment. The core is moderated by graphite, zirconium hydride, and organic fluid while cooled by the organic fluid. The organic coolant enables operation near atmospheric pressure and use of plain carbon steel for the reactor tank and primary coolant piping system. The core is designed to mitigate the coolant degradation seen in early organic reactors. Overall, the design provides a power density of 40 kW/L, while reducing the reactor hull size by 40% compared with a pressurized water reactor while significantly reducing capital plant costs.

  5. Technical features of the MR reactor decommissioning

    Directory of Open Access Journals (Sweden)

    Craig David

    2008-01-01

    Full Text Available This paper presents a preliminary technical design for the dismantling of the MR reactor. The goal of the design is the removal of reactor components allowing the re-use of the building for a different nuclear related purpose. The sequence of segmentation procedures is established. Considerations on the size reduction and tooling are presented.

  6. The First Reactor, 40th Anniversary (rev.)

    Energy Technology Data Exchange (ETDEWEB)

    Allardice, Corbin; Trapnell, Edward R; Fermi, Enrico; Fermi, Laura; Williams, Robert C

    1982-12-01

    This booklet, an updated version of the original booklet describing the first nuclear reactor, was written in honor of the 40th anniversary of the first reactor or "pile". It is based on firsthand accounts told to Corbin Allardice and Edward R. Trapnell, and includes recollections of Enrico and Laura Fermi.

  7. MODERATOR ELEMENTS FOR UNIFORM POWER NUCLEAR REACTOR

    Science.gov (United States)

    Balent, R.

    1963-03-12

    This patent describes a method of obtaining a flatter flux and more uniform power generation across the core of a nuclear reactor. The method comprises using moderator elements having differing moderating strength. The elements have an increasing amount of the better moderating material as a function of radial and/or axial distance from the reactor core center. (AEC)

  8. Parametric sensitivity and runaway in tubular reactors

    Energy Technology Data Exchange (ETDEWEB)

    Morbidelli, M.; Varma, A.

    1982-09-01

    Parametric sensitivity of tubular reactors is analyzed to provide critical values of the heat of reaction and heat transfer parameters defining runaway and stable operations for all positive-order exothermic reactions with finite activation energies, and for all reactor inlet temperatures. Evaluation of the critical values does not involve any trial and error.

  9. Microbial degradation of MTBE in reactors

    DEFF Research Database (Denmark)

    Waul, Christopher Kevin; Arvin, Erik; Schmidt, Jens Ejbye

    2007-01-01

    , toluene, ethylbenzene and xylenes, may reduce the removal rates of MTBE, or prevent its removal in reactors. With mathematical modelling, the long startup time required for some MTBE degrading reactors could be predicted. Long startup times of up to 200 days were due to the low maximum growth rate...

  10. Design of an Organic Simplified Nuclear Reactor

    Directory of Open Access Journals (Sweden)

    Koroush Shirvan

    2016-08-01

    Full Text Available Numerous advanced reactor concepts have been proposed to replace light water reactors ever since their establishment as the dominant technology for nuclear energy production. While most designs seek to improve cost competitiveness and safety, the implausibility of doing so with affordable materials or existing nuclear fuel infrastructure reduces the possibility of near-term deployment, especially in developing countries. The organic nuclear concept, first explored in the 1950s, offers an attractive alternative to advanced reactor designs being considered. The advent of high temperature fluids, along with advances in hydrocracking and reforming technologies driven by the oil and gas industries, make the organic concept even more viable today. We present a simple, cost-effective, and safe small modular nuclear reactor for offshore underwater deployment. The core is moderated by graphite, zirconium hydride, and organic fluid while cooled by the organic fluid. The organic coolant enables operation near atmospheric pressure and use of plain carbon steel for the reactor tank and primary coolant piping system. The core is designed to mitigate the coolant degradation seen in early organic reactors. Overall, the design provides a power density of 40 kW/L, while reducing the reactor hull size by 40% compared with a pressurized water reactor while significantly reducing capital plant costs.

  11. Verification of Remote Inspection Techniques for Reactor Internal Structures of Liquid Metal Reactor

    Energy Technology Data Exchange (ETDEWEB)

    Joo, Young Sang; Lee, Jae Han

    2007-02-15

    The reactor internal structures and components of a liquid metal reactor (LMR) are submerged in hot sodium of reactor vessel. The division 3 of ASME code section XI specifies the visual inspection as major in-service inspection (ISI) methods of reactor internal structures and components. Reactor internals of LMR can not be visually examined due to opaque liquid sodium. The under-sodium viewing techniques using an ultrasonic wave should be applied for the visual inspection of reactor internals. Recently, an ultrasonic waveguide sensor with a strip plate has been developed for an application to the under-sodium inspection. In this study, visualization technique, ranging technique and monitoring technique have been suggested for the remote inspection of reactor internals by using the waveguide sensor. The feasibility of these remote inspection techniques using ultrasonic waveguide sensor has been evaluated by an experimental verification.

  12. State space modeling of reactor core in a pressurized water reactor

    Energy Technology Data Exchange (ETDEWEB)

    Ashaari, A.; Ahmad, T.; M, Wan Munirah W. [Department of Mathematical Science, Faculty of Science, Universiti Teknologi Malaysia, 81310 Skudai, Johor (Malaysia); Shamsuddin, Mustaffa [Institute of Ibnu Sina, Universiti Teknologi Malaysia, 81310 Skudai, Johor (Malaysia); Abdullah, M. Adib [Swinburne University of Technology, Faculty of Engineering, Computing and Science, Jalan Simpang Tiga, 93350 Kuching, Sarawak (Malaysia)

    2014-07-10

    The power control system of a nuclear reactor is the key system that ensures a safe operation for a nuclear power plant. However, a mathematical model of a nuclear power plant is in the form of nonlinear process and time dependent that give very hard to be described. One of the important components of a Pressurized Water Reactor is the Reactor core. The aim of this study is to analyze the performance of power produced from a reactor core using temperature of the moderator as an input. Mathematical representation of the state space model of the reactor core control system is presented and analyzed in this paper. The data and parameters are taken from a real time VVER-type Pressurized Water Reactor and will be verified using Matlab and Simulink. Based on the simulation conducted, the results show that the temperature of the moderator plays an important role in determining the power of reactor core.

  13. State space modeling of reactor core in a pressurized water reactor

    Science.gov (United States)

    Ashaari, A.; Ahmad, T.; Shamsuddin, Mustaffa; M, Wan Munirah W.; Abdullah, M. Adib

    2014-07-01

    The power control system of a nuclear reactor is the key system that ensures a safe operation for a nuclear power plant. However, a mathematical model of a nuclear power plant is in the form of nonlinear process and time dependent that give very hard to be described. One of the important components of a Pressurized Water Reactor is the Reactor core. The aim of this study is to analyze the performance of power produced from a reactor core using temperature of the moderator as an input. Mathematical representation of the state space model of the reactor core control system is presented and analyzed in this paper. The data and parameters are taken from a real time VVER-type Pressurized Water Reactor and will be verified using Matlab and Simulink. Based on the simulation conducted, the results show that the temperature of the moderator plays an important role in determining the power of reactor core.

  14. Precision spectroscopy with reactor anti-neutrinos

    CERN Document Server

    Huber, P; Huber, Patrick; Schwetz, Thomas

    2004-01-01

    In this work we present an accurate parameterization of the anti-neutrino flux produced by the isotopes 235U, 239Pu and 241Pu in nuclear reactors. We determine the coefficients of this parameterization, as well as their covariance matrix, by performing a fit to spectra inferred from experimentally measured beta spectra. Subsequently we show that flux shape uncertainties play only a minor role in the KamLAND experiment, however, we find that future reactor neutrino experiments to measure the mixing angle $\\theta_{13}$ are sensitive to the fine details of the reactor neutrino spectra. Finally, we investigate the possibility to determine the isotopic composition in nuclear reactors through an anti-neutrino measurement. We find that with a 3 month exposure of a one ton detector the isotope fractions and the thermal reactor power can be determined at a few percent accuracy, which may open the possibility of an application for safeguard or non-proliferation objectives.

  15. Scanning tunneling microscope assembly, reactor, and system

    Science.gov (United States)

    Tao, Feng; Salmeron, Miquel; Somorjai, Gabor A

    2014-11-18

    An embodiment of a scanning tunneling microscope (STM) reactor includes a pressure vessel, an STM assembly, and three spring coupling objects. The pressure vessel includes a sealable port, an interior, and an exterior. An embodiment of an STM system includes a vacuum chamber, an STM reactor, and three springs. The three springs couple the STM reactor to the vacuum chamber and are operable to suspend the scanning tunneling microscope reactor within the interior of the vacuum chamber during operation of the STM reactor. An embodiment of an STM assembly includes a coarse displacement arrangement, a piezoelectric fine displacement scanning tube coupled to the coarse displacement arrangement, and a receiver. The piezoelectric fine displacement scanning tube is coupled to the coarse displacement arrangement. The receiver is coupled to the piezoelectric scanning tube and is operable to receive a tip holder, and the tip holder is operable to receive a tip.

  16. Reactor assessments of advanced bumpy torus configurations

    Energy Technology Data Exchange (ETDEWEB)

    Uckan, N.A.; Owen, L.W.; Spong, D.A.; Miller, R.L.; Ard, W.B.; Pipkins, J.F.; Schmitt, R.J.

    1984-02-01

    Recently, several innovative approaches were introduced for enhancing the performance of the basic ELMO Bumpy Torus (EBT) concept and for improving its reactor potential. These include planar racetrack and square geometries, Andreoletti coil systems, and bumpy torus-stellarator hybrids (which include twisted racetrack and helical axis stellarator - snakey torus). Preliminary evaluations of reactor implications of each approach have been carried out based on magnetics (vacuum) calculations, transport and scaling relationships, and stability properties deduced from provisional configurations that implement the approach but are not necessarily optimized. Further optimization is needed in all cases to evaluate the full potential of each approach. Results of these studies indicate favorable reactor projections with a significant reduction in reactor physical size as compared to conventional EBT reactor designs carried out in the past.

  17. Reactivity control assembly for nuclear reactor. [LMFBR

    Science.gov (United States)

    Bollinger, L.R.

    1982-03-17

    This invention, which resulted from a contact with the United States Department of Energy, relates to a control mechanism for a nuclear reactor and, more particularly, to an assembly for selectively shifting different numbers of reactivity modifying rods into and out of the core of a nuclear reactor. It has been proposed heretofore to control the reactivity of a breeder reactor by varying the depth of insertion of control rods (e.g., rods containing a fertile material such as ThO/sub 2/) in the core of the reactor, thereby varying the amount of neutron-thermalizing coolant and the amount of neutron-capturing material in the core. This invention relates to a mechanism which can advantageously be used in this type of reactor control system.

  18. Power Control Method for Research Reactor

    Energy Technology Data Exchange (ETDEWEB)

    Baang, Dane; Suh, Yongsuk; Park, Cheol [Korea Atomic Energy Research Institute, Daejeon (Korea, Republic of)

    2015-05-15

    Considering safety-oriented design concept and other control environment, we developed a simple controller that provides limiting function of power change- rate as well as fine tracking performance. The design result has been well-proven via simulation and actual application to a TRIGA-II type research reactor. The proposed controller is designed to track the PDM(Power Demand) from operator input as long as maintaining the power change rate lower than a certain value for stable reactor operation. A power control method for a TRIGA-II type research reactor has been designed, simulated, and applied to actual reactor. The control performance during commissioning test shows that the proposed controller provides fine control performance for various changes in reference values (PDM), even though there is large measurement noise from neutron detectors. The overshoot at low power level is acceptable in a sense of reactor operation.

  19. Integração do enxerto heterólogo de pele humana no subepitélio da bolsa jugal do hamster (Mesocricetus auratus Integration of human skin heterologous graft into hamster (Mesocricetus auratus cheek pouch sub-epithelium

    Directory of Open Access Journals (Sweden)

    Bernardo Hochman

    2003-10-01

    Full Text Available OBJETIVO: Descrever a integração de enxertos de pele total humana no subepitélio da bolsa jugal do hamster (Mesocricetus auratus. MÉTODOS: A amostragem consistiu de 18 hamsters machos, exogâmicos, com 10 a 14 semanas de idade. Fragmentos de pele humana normal foram obtidos de pele excedente de mastoplastia redutora de paciente parda. Cada hamster foi enxertado em ambas as bolsas com fragmentos de pele, perfazendo um total de 36 fragmentos enxertados. Os animais foram distribuídos, em 6 grupos, para exame dos fragmentos enxertados com 5, 12, 21, 42, 84 e 168 dias. Uma avaliação macroscópica foi realizada comparando a bolsa contendo o fragmento enxertado em cada período com a mesma bolsa no pós-operatório imediato, mediante fotografias padronizadas. Na avaliação microscópica foi adotado como critério de integração a presença de vasos sangüíneos na derme dos enxertos. Observou-se também a presença de queratina, melanócitos, infiltrado celular e aspecto do tecido conjuntivo. RESULTADOS: Na avaliação macroscópica foi observada uma reação vascular em torno dos fragmentos até 12 dias do implante, e a presença de pigmentação castanho-escura a partir de 42 dias. À microscopia, integraram-se 80,64% dos fragmentos enxertados, inclusive no grupo de 168 dias. Observou-se infiltrado celular inflamatório até 12 dias, a presença de melanócitos a partir de 42 dias e uma hialinização do tecido conjuntivo após 84 dias. CONCLUSÕES: Fragmentos de pele humana integram-se no tecido celular subcutâneo da bolsa jugal do hamster, mantêm-se vascularizados por 168 dias, e conservam o epitélio íntegro até 21 dias. O subepitélio da bolsa representa modelo experimental de investigação da fisiologia de pele humana ex vivo.PURPOSE: To describe the integration of total human skin into hamster (Mesocricetus auratus cheek pouch. METHODS: The sample was formed by 18 male hamsters, outbred, aging between 10 and 14 weeks. Fragments of

  20. Ceramic oxygen transport membrane array reactor and reforming method

    Science.gov (United States)

    Kelly, Sean M.; Christie, Gervase Maxwell; Robinson, Charles; Wilson, Jamie R.; Gonzalez, Javier E.; Doraswami, Uttam R.

    2016-11-08

    The invention relates to a commercially viable modular ceramic oxygen transport membrane reforming reactor configured using repeating assemblies of oxygen transport membrane tubes and catalytic reforming reactors.

  1. Fast Spectrum Molten Salt Reactor Options

    Energy Technology Data Exchange (ETDEWEB)

    Gehin, Jess C [ORNL; Holcomb, David Eugene [ORNL; Flanagan, George F [ORNL; Patton, Bruce W [ORNL; Howard, Rob L [ORNL; Harrison, Thomas J [ORNL

    2011-07-01

    During 2010, fast-spectrum molten-salt reactors (FS-MSRs) were selected as a transformational reactor concept for light-water reactor (LWR)-derived heavy actinide disposition by the Department of Energy-Nuclear Energy Advanced Reactor Concepts (ARC) program and were the subject of a preliminary scoping investigation. Much of the reactor description information presented in this report derives from the preliminary studies performed for the ARC project. This report, however, has a somewhat broader scope-providing a conceptual overview of the characteristics and design options for FS-MSRs. It does not present in-depth evaluation of any FS-MSR particular characteristic, but instead provides an overview of all of the major reactor system technologies and characteristics, including the technology developments since the end of major molten salt reactor (MSR) development efforts in the 1970s. This report first presents a historical overview of the FS-MSR technology and describes the innovative characteristics of an FS-MSR. Next, it provides an overview of possible reactor configurations. The following design features/options and performance considerations are described including: (1) reactor salt options-both chloride and fluoride salts; (2) the impact of changing the carrier salt and actinide concentration on conversion ratio; (3) the conversion ratio; (4) an overview of the fuel salt chemical processing; (5) potential power cycles and hydrogen production options; and (6) overview of the performance characteristics of FS-MSRs, including general comparative metrics with LWRs. The conceptual-level evaluation includes resource sustainability, proliferation resistance, economics, and safety. The report concludes with a description of the work necessary to begin more detailed evaluation of FS-MSRs as a realistic reactor and fuel cycle option.

  2. Radiation protection at new reactors

    Energy Technology Data Exchange (ETDEWEB)

    Brissaud, A. [EDF INDUSTRY, Basic Design Department, EDF-SEPTEN, VILLEURBANNE Cedex (France)

    2000-05-01

    The theoritical knowledge and the feedback of operating experience concerning radiations in reactors is now considerable. It is available to the designer in the form of predictive softwares and data bases. Thus, it is possible to include the radiation protection component throughout all the design process. In France, the existing reactors have not been designed with quantified radiation protection targets, although considerable efforts have been made to reduce sources of radiation illustrated by the decrease of the average dose rates (typically a factor 5 between the first 900 MWe and the last 1300 MWe units). The EDF ALARA PROJECT has demonstrated that good practises, radiation protection awareness, careful work organization had a strong impact on operation and maintenance work volume. A decrease of the average collective dose by a factor 2 has been achieved without noticeable modifications of the units. In the case of new nuclear facilities projects (reactor, intermediate storage facility,...), or special operations (such as steam generator replacement), quantified radiation protection targets are included in terms of collective and average individual doses within the frame of a general optimization scheme. The target values by themselves are less important than the application of an optimization process throughout the design. This is because the optimization process requires to address all the components of the dose, particularly the work volume for operation and maintenance. A careful study of this parameter contributes to the economy of the project (suppression of unecessary tasks, time-saving ergonomy of work sites). This optimization process is currently applied to the design of the EPR. General radiation protection provisions have been addressed during the basic design phase by applying general rules aiming at the reduction of sources and dose rates. The basic design optimization phase has mainly dealt with the possibility to access the containment at full

  3. The research reactors their contribution to the reactors physics; Les reacteurs de recherche leur apport sur la physique des reacteurs

    Energy Technology Data Exchange (ETDEWEB)

    Barral, J.C. [Electricite de France (EDF), 75 - Paris (France); Zaetta, A. [CEA/Cadarache, Direction des Reacteurs Nucleaires, DRN, 13 - Saint-Paul-lez-Durance (France); Johner, J. [CEA/Cadarache, Dept. de Recherches sur la Fusion Controlee (DRFC), 13 - Saint Paul lez Durance (France); Mathoniere, G. [CEA/Saclay, DEN, 91 - Gif sur Yvette (France)] [and others

    2000-07-01

    The 19 october 2000, the french society of nuclear energy organized a day on the research reactors. This associated report of the technical session, reactors physics, is presented in two parts. The first part deals with the annual meeting and groups general papers on the pressurized water reactors, the fast neutrons reactors and the fusion reactors industry. The second part presents more technical papers about the research programs, critical models, irradiation reactors (OSIRIS and Jules Horowitz) and computing tools. (A.L.B.)

  4. PCCF flow analysis -- DR Reactor

    Energy Technology Data Exchange (ETDEWEB)

    Calkin, J.F.

    1961-04-26

    This report contains an analysis of PCCF tube flow and Panellit pressure relations at DR reactor. Supply curves are presented at front header pressures from 480 to 600 psig using cold water and the standard 0.236 inch orifice with taper down stream and the pigtail valve (plug or ball) open. Demand curves are presented for slug column lengths of 200 inches to 400 inches using 1.44 inch O.D. solid poison pieces (either Al or Pb-Cd) and cold water with a rear header pressure of 50 psig. Figure 1 is a graph of Panellit pressure vs. flow with the above supply and demand curves and clearly shows the effect of front header pressure and charge length on flow.

  5. Coacervates as prebiotic chemical reactors

    Science.gov (United States)

    Kolb, Vera M.; Swanson, Mercedes; Menger, Fredric M.

    2012-10-01

    Coacervates are colloidal systems that are comprised of two immiscible aqueous layers, the colloid-rich layer, so-called coacervate, and the colloid-poor layer, so-called equilibrium liquid. Although immiscible, the two phases are both water-rich. Coacervates are important for prebiotic chemistry, but also have various practical applications, notably as transport vehicles of personal care products and pharmaceuticals. Our objectives are to explore the potential of coacervates as prebiotic chemical reactors. Since the reaction medium in coacervates is water, this creates a challenge, since most organic reactants are not water-soluble. To overcome this challenge we are utilizing recent Green Chemistry examples of the organic reactions in water, such as the Passerini reaction. We have investigated this reaction in two coacervate systems, and report here our preliminary results.

  6. Replacement reactor to revolutionise magnets

    CERN Document Server

    Atkins, G

    2002-01-01

    Electric motors, hearing aids and magnetic resonance imaging are only some of the applications that will benefit from the first advances in magnets in a quarter of a century. Magnets achieve their characteristics when electrons align themselves to produce a unified magnetic field. Neutrons can probe these magnetic structures. The focus is not just on making more powerful magnets, but also identifying the characteristics that make magnets cheaper and easier for industry to manufacture. Staff from the ANSTO's Neutron Scattering Group have already performed a number of studies on the properties of magnets using using HIFAR, but the Replacement Research Reactor that will produce cold neutrons would allow scientists to investigate the atomic properties of materials with large molecules. A suite of equipment will enable studies at different temperatures, pressures and magnetic fields

  7. Dynamic analysis of process reactors

    Energy Technology Data Exchange (ETDEWEB)

    Shadle, L.J.; Lawson, L.O.; Noel, S.D.

    1995-06-01

    The approach and methodology of conducting a dynamic analysis is presented in this poster session in order to describe how this type of analysis can be used to evaluate the operation and control of process reactors. Dynamic analysis of the PyGas{trademark} gasification process is used to illustrate the utility of this approach. PyGas{trademark} is the gasifier being developed for the Gasification Product Improvement Facility (GPIF) by Jacobs-Siffine Engineering and Riley Stoker. In the first step of the analysis, process models are used to calculate the steady-state conditions and associated sensitivities for the process. For the PyGas{trademark} gasifier, the process models are non-linear mechanistic models of the jetting fluidized-bed pyrolyzer and the fixed-bed gasifier. These process sensitivities are key input, in the form of gain parameters or transfer functions, to the dynamic engineering models.

  8. Reactor operation environmental information document

    Energy Technology Data Exchange (ETDEWEB)

    Wike, L.D.; Specht, W.L.; Mackey, H.E.; Paller, M.H.; Wilde, E.W.; Dicks, A.S.

    1989-12-01

    The Savannah River Site (SRS) is a large United States Department of Energy installation on the upper Atlantic Coastal Plain of South Carolina. The SRS contains diverse habitats, flora, and fauna. Habitats include upland terrestrial areas, varied wetlands including Carolina Bays, the Savannah River swamp system, and impoundment related and riparian wetlands, and the aquatic habitats of several stream systems, two large cooling reservoirs, and the Savannah River. These diverse habitats support a large variety of plants and animals including many commercially or recreational valuable species and several rare, threatened or endangered species. This volume describes the major habitats and their biota found on the SRS, and discuss the impacts of continued operation of the K, L, and P production reactors.

  9. (Meeting on fusion reactor materials)

    Energy Technology Data Exchange (ETDEWEB)

    Jones, R.H. (Pacific Northwest Lab., Richland, WA (USA)); Klueh, R.L.; Rowcliffe, A.F.; Wiffen, F.W. (Oak Ridge National Lab., TN (USA)); Loomis, B.A. (Argonne National Lab., IL (USA))

    1990-11-01

    During his visit to the KfK, Karlsruhe, F. W. Wiffen attended the IEA 12th Working Group Meeting on Fusion Reactor Materials. Plans were made for a low-activation materials workshop at Culham, UK, for April 1991, a data base workshop in Europe for June 1991, and a molecular dynamics workshop in the United States in 1991. At the 11th IEA Executive Committee on Fusion Materials, discussions centered on the recent FPAC and Colombo panel review in the United States and EC, respectively. The Committee also reviewed recent progress toward a neutron source in the United States (CWDD) and in Japan (ESNIT). A meeting with D. R. Harries (consultant to J. Darvas) yielded a useful overview of the EC technology program for fusion. Of particular interest to the US program is a strong effort on a conventional ferritic/martensitic steel for fist wall/blanket operation beyond NET/ITER.

  10. Flexible Conversion Ratio Fast Reactor Systems Evaluation

    Energy Technology Data Exchange (ETDEWEB)

    Neil Todreas; Pavel Hejzlar

    2008-06-30

    Conceptual designs of lead-cooled and liquid salt-cooled fast flexible conversion ratio reactors were developed. Both concepts have cores reated at 2400 MWt placed in a large-pool-type vessel with dual-free level, which also contains four intermediate heat exchanges coupling a primary coolant to a compact and efficient supercritical CO2 Brayton cycle power conversion system. Decay heat is removed passively using an enhanced Reactor Vessel Auxiliary Cooling System and a Passive Secondary Auxiliary Cooling System. The most important findings were that (1) it is feasible to design the lead-cooled and salt-cooled reactor with the flexible conversion ratio (CR) in the range of CR=0 and CR=1 n a manner that achieves inherent reactor shutdown in unprotected accidents, (2) the salt-cooled reactor requires Lithium thermal Expansion Modules to overcme the inherent salt coolant's large positive coolant temperature reactivity coefficient, (3) the preferable salt for fast spectrum high power density cores is NaCl-Kcl-MgCl2 as opposed to fluoride salts due to its better themal-hydraulic and neutronic characteristics, and (4) both reactor, but attain power density 3 times smaller than that of the sodium-cooled reactor.

  11. The Swedish Zero Power Reactor R0

    Energy Technology Data Exchange (ETDEWEB)

    Landergaard, Olof; Cavallin, Kaj; Jonsson, Georg

    1961-05-15

    The reactor R0 is a critical facility built for heavy water and natural uranium or fuel of low enrichment,, The first criticality was achieved September 25, 1959. During a first period of more than two years the R0 will be operated as a bare reactor in order to simplify interpretation of results. The reactor tank is 3. 2 m high and 2. 25 m in diameter. The fuel suspension system is quite flexible in order to facilitate fuel exchange and lattice variations. The temperature of the water can be varied between about 10 and 90 C by means of a heater and a cooler placed in the external circulating system. The instrumentation of the reactor has to meet the safety requirements not only during operation but also during rearrangements of the core in the shut-down state. Therefore, the shut-down state is always defined by a certain low 'safe' moderator level in the reactor tank. A number of safety rods are normally kept above the moderator ready for action. For manual or automatic control of the reactor power a specially designed piston pump is needed, by which the moderator level is varied. The pump speed is controlled from the reactor power error by means of a Ward-Leonard system. Moderator level measurement is made by means of a water gauge with an accuracy of {+-} 0. 1 mm.

  12. Facility for a Low Power Research Reactor

    Energy Technology Data Exchange (ETDEWEB)

    Chalker, R. G.

    1949-09-14

    Preliminary investigation indicates that a reactor facility with ample research provisions for use by University or other interested groups, featuring safety in design, can be economically constructed in the Los Angeles area. The complete installation, including an underground gas-tight reactor building, with associated storage and experiment assembly building, administration offices, two general laboratory buildings, hot latoratory and lodge, can be constructed for approxinately $1,500,000. This does not include the cost of the reactor itself or of its auxiliary equipment,

  13. Pyrometric fuel particle measurements in pressurised reactors

    Energy Technology Data Exchange (ETDEWEB)

    Hernberg, R.; Joutsenoja, T. [Tampere Univ. of Technology (Finland)

    1996-12-01

    A fiberoptic two-colour pyrometric technique for fuel particle temperature and size measurement is modified and applied to three pressurized reactors of different type in Finland, Germany and France. A modification of the pyrometric method for simultaneous in situ measurement of the temperature and size of individual pulverized coal particles at the pressurized entrained flow reactor in Jyvaeskylae was developed and several series of measurements were made. In Orleans a fiberoptic pyrometric device was installed to a pressurised thermogravimetric reactor and the two-colour temperatures of fuel samples were measured. Some results of these measurements are presented. The project belongs to EU`s Joule 2 extension research programme. (author)

  14. Oxidation performance of graphite material in reactors

    Institute of Scientific and Technical Information of China (English)

    Xiaowei LUO; Xinli YU; Suyuan YU

    2008-01-01

    Graphite is used as a structural material and moderator for high temperature gas-cooled reactors (HTGR). When a reactor is in operation, graphite oxida-tion influences the safety and operation of the reactor because of the impurities in the coolant and/or the acci-dent conditions, such as water ingress and air ingress. In this paper, the graphite oxidation process is introduced, factors influencing graphite oxidation are analyzed and discussed, and some new directions for further study are pointed out.

  15. Sistemas de salvaguardia en reactores EPR

    OpenAIRE

    2015-01-01

    En este documento se describe brevemente el funcionamiento de los diversos sistemas de una planta nuclear operada con un reactor de tipo PWR. Más concretamente, el proyecto se centra en una descripción exhaustiva de los sistemas de salvaguardia y seguridad que regulan el funcionamiento de un reactor de tipo EPR, así como la central nuclear que contiene a dicho reactor. El proceso ha consistido en clasificar y resumir los distintos sistemas que operan en dicha planta, estudiando sus caracterís...

  16. Packed fluidized bed blanket for fusion reactor

    Science.gov (United States)

    Chi, John W. H.

    1984-01-01

    A packed fluidized bed blanket for a fusion reactor providing for efficient radiation absorption for energy recovery, efficient neutron absorption for nuclear transformations, ease of blanket removal, processing and replacement, and on-line fueling/refueling. The blanket of the reactor contains a bed of stationary particles during reactor operation, cooled by a radial flow of coolant. During fueling/refueling, an axial flow is introduced into the bed in stages at various axial locations to fluidize the bed. When desired, the fluidization flow can be used to remove particles from the blanket.

  17. Monitoring and control of anaerobic reactors

    DEFF Research Database (Denmark)

    Pind, Peter Frode; Angelidaki, Irini; Ahring, Birgitte Kiær;

    2003-01-01

    measurements are reviewed in detail. In the sequel, possible manipulated variables, such as the hydraulic retention time, the organic loading rate, the sludge retention time, temperature, pH and alkalinity are evaluated with respect to the two main reactor types: high-rate and low-rate. Finally, the different......The current status in monitoring and control of anaerobic reactors is reviewed. The influence of reactor design and waste composition on the possible monitoring and control schemes is examined. After defining the overall control structure, and possible control objectives, the possible process...

  18. Transients in reactors for power systems compensation

    Science.gov (United States)

    Abdul Hamid, Haziah

    This thesis describes new models and investigations into switching transient phenomena related to the shunt reactors and the Mechanically Switched Capacitor with Damping Network (MSCDN) operations used for reactive power control in the transmission system. Shunt reactors and MSCDN are similar in that they have reactors. A shunt reactor is connected parallel to the compensated lines to absorb the leading current, whereas the MSCDN is a version of a capacitor bank designed as a C-type filter for use in the harmonic-rich environment. In this work, models have been developed and transient overvoltages due to shunt reactor deenergisation were estimated analytically using MathCad, a mathematical program. Computer simulations used the ATP/EMTP program to reproduce both single-phase and three-phase shunt reactor switching at 275 kV operational substations. The effect of the reactor switching on the circuit breaker grading capacitor was also examined by considering various switching conditions.. The main original achievement of this thesis is the clarification of failure mechanisms occurring in the air-core filter reactor due to MSCDN switching operations. The simulation of the MSCDN energisation was conducted using the ATP/EMTP program in the presence of surge arresters. The outcome of this simulation shows that extremely fast transients were established across the air-core filter reactor. This identified transient event has led to the development of a detailed air-core reactor model, which accounts for the inter-turn RLC parameters as well as the stray capacitances-to-ground. These parameters are incorporated into the transient simulation circuit, from which the current and voltage distribution across the winding were derived using electric field and equivalent circuit modelling. Analysis of the results has revealed that there are substantial dielectric stresses imposed on the winding insulation that can be attributed to a combination of three factors. (i) First, the

  19. Assessing Pretreatment Reactor Scaling Through Empirical Analysis

    Energy Technology Data Exchange (ETDEWEB)

    Lischeske, James J.; Crawford, Nathan C.; Kuhn, Erik; Nagle, Nicholas J.; Schell, Daniel J.; Tucker, Melvin P.; McMillan, James D.; Wolfrum, Edward J.

    2016-12-01

    Pretreatment is a critical step in the biochemical conversion of lignocellulosic biomass to fuels and chemicals. Due to the complexity of the physicochemical transformations involved, predictively scaling up technology from bench- to pilot-scale is difficult. This study examines how pretreatment effectiveness under nominally similar reaction conditions is influenced by pretreatment reactor design and scale using four different pretreatment reaction systems ranging from a 3 g batch reactor to a 10 dry-ton/d continuous reactor. The reactor systems examined were an Automated Solvent Extractor (ASE), Steam Explosion Reactor (SER), ZipperClave(R) reactor (ZCR), and Large Continuous Horizontal-Screw Reactor (LHR). To our knowledge, this is the first such study performed on pretreatment reactors across a range of reaction conditions (time and temperature) and at different reactor scales. The comparative pretreatment performance results obtained for each reactor system were used to develop response surface models for total xylose yield after pretreatment and total sugar yield after pretreatment followed by enzymatic hydrolysis. Near- and very-near-optimal regions were defined as the set of conditions that the model identified as producing yields within one and two standard deviations of the optimum yield. Optimal conditions identified in the smallest-scale system (the ASE) were within the near-optimal region of the largest scale reactor system evaluated. A reaction severity factor modeling approach was shown to inadequately describe the optimal conditions in the ASE, incorrectly identifying a large set of sub-optimal conditions (as defined by the RSM) as optimal. The maximum total sugar yields for the ASE and LHR were 95%, while 89% was the optimum observed in the ZipperClave. The optimum condition identified using the automated and less costly to operate ASE system was within the very-near-optimal space for the total xylose yield of both the ZCR and the LHR, and was

  20. Passive compact molten salt reactor (PCMSR), modular thermal breeder reactor with totally passive safety system

    Energy Technology Data Exchange (ETDEWEB)

    Harto, Andang Widi [Engineering Physics Department, Faculty of Engineering, Gadjah Mada University (Indonesia)

    2012-06-06

    Design Study Passive Compact Molten Salt Reactor (PCMSR) with totally passive safety system has been performed. The term of Compact in the PCMSR name means that the reactor system is designed to have relatively small volume per unit power output by using modular and integral concept. In term of modular, the reactor system consists of three modules, i.e. reactor module, turbine module and fuel management module. The reactor module is an integral design that consists of reactor, primary and intermediate heat exchangers and passive post shutdown cooling system. The turbine module is an integral design of a multi heating, multi cooling, regenerative gas turbine. The fuel management module consists of all equipments related to fuel preparation, fuel reprocessing and radioactive handling. The preliminary calculations show that the PCMSR has negative temperature and void reactivity coefficient, passive shutdown characteristic related to fuel pump failure and possibility of using natural circulation for post shutdown cooling system.

  1. Advanced research reactor fuel development

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Chang Kyu; Pak, H. D.; Kim, K. H. [and others

    2000-05-01

    The fabrication technology of the U{sub 3}Si fuel dispersed in aluminum for the localization of HANARO driver fuel has been launches. The increase of production yield of LEU metal, the establishment of measurement method of homogeneity, and electron beam welding process were performed. Irradiation test under normal operation condition, had been carried out and any clues of the fuel assembly breakdown was not detected. The 2nd test fuel assembly has been irradiated at HANARO reactor since 17th June 1999. The quality assurance system has been re-established and the eddy current test technique has been developed. The irradiation test for U{sub 3}Si{sub 2} dispersed fuels at HANARO reactor has been carried out in order to compare the in-pile performance of between the two types of U{sub 3}Si{sub 2} fuels, prepared by both the atomization and comminution processes. KAERI has also conducted all safety-related works such as the design and the fabrication of irradiation rig, the analysis of irradiation behavior, thermal hydraulic characteristics, stress analysis for irradiation rig, and thermal analysis fuel plate, for the mini-plate prepared by international research cooperation being irradiated safely at HANARO. Pressure drop test, vibration test and endurance test were performed. The characterization on powders of U-(5.4 {approx} 10 wt%) Mo alloy depending on Mo content prepared by rotating disk centrifugal atomization process was carried out in order to investigate the phase stability of the atomized U-Mo alloy system. The {gamma}-U phase stability and the thermal compatibility of atomized U-16at.%Mo and U-14at.%Mo-2at.%X(: Ru, Os) dispersion fuel meats at an elevated temperature have been investigated. The volume increases of U-Mo compatibility specimens were almost the same as or smaller than those of U{sub 3}Si{sub 2}. However the atomized alloy fuel exhibited a better irradiation performance than the comminuted alloy. The RERTR-3 irradiation test of nano

  2. Hydrodynamics of multi-phase packed bed micro-reactors

    NARCIS (Netherlands)

    Márquez Luzardo, N.M.

    2010-01-01

    Why to use packed bed micro-reactors for catalyst testing? Miniaturized packed bed reactors have a large surface-to-volume ratio at the reactor and particle level that favors the heat- and mass-transfer processes at all scales (intra-particle, inter-phase and inter-particle or reactor level). If the

  3. Progress of China Experimental Fast Reactor in 2011

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    1 Background Fast reactor is the reactor which realized the chain fission with fast neutron.As an optional type of generation Ⅳ reactor,fast reactor has three characters:1) It can change 238U to 239Pu and raise the uranium resource utilization

  4. Uncertainties in the Anti-neutrino Production at Nuclear Reactors

    OpenAIRE

    Djurcic, Z.(Argonne National Laboratory, Argonne, Illinois, 60439, U.S.A.); Detwiler, J. A.; Piepke, A.; Foster Jr., V. R.; Miller, L.; Gratta, G.

    2008-01-01

    Anti-neutrino emission rates from nuclear reactors are determined from thermal power measurements and fission rate calculations. The uncertainties in these quantities for commercial power plants and their impact on the calculated interaction rates in electron anti-neutrino detectors is examined. We discuss reactor-to-reactor correlations between the leading uncertainties and their relevance to reactor anti-neutrino experiments.

  5. Ex-vessel Steam Explosion Analysis for Pressurized Water Reactor and Boiling Water Reactor

    OpenAIRE

    Matjaž Leskovar; Mitja Uršič

    2016-01-01

    A steam explosion may occur during a severe accident, when the molten core comes into contact with water. The pressurized water reactor and boiling water reactor ex-vessel steam explosion study, which was carried out with the multicomponent three-dimensional Eulerian fuel–coolant interaction code under the conditions of the Organisation for Economic Co-operation and Development (OECD) Steam Explosion Resolution for Nuclear Applications project reactor exercise, is presented and discussed. In ...

  6. Optimization of a sequence of reactors

    DEFF Research Database (Denmark)

    Vidal, Rene Victor Valqui

    1991-01-01

    Concerns the optimal production of sulphuric acid in a sequence of reactors. Using a suitable approximation to the objective function, this problem can easily be solved using the maximum principle. A numerical example documents the applicability of the suggested approach...

  7. The Bifurcation Behavior of CO Coupling Reactor

    Institute of Scientific and Technical Information of China (English)

    徐艳; 马新宾; 许根慧

    2005-01-01

    The bifurcation behavior of the CO coupling reactor was examined based on the one-dimensional pseudohomogeneous axial dispersion dynamic model. The method of finite difference was used for solving the boundary value problem; the continuation technique and the direct method were applied to determine the bifurcation diagram.The effects of dimensionless adiabatic temperature rise, Damkoehler number, activation energy, heat transfer coefficient and feed ratio on the bifurcation behavior were investigated. It was shown that there existed static bifurcation and the oscillations did not occur in the reactor. The result also revealed that the reactor exhibited at most 1-3-1 multiplilicity patterns within the range of practical possible parameters and the measures, such as weakening the axial dispersion of reactor, enhancing heat transfer, decreasing the concentration of ethyl nitrite, were efficient for avoiding the possible risk of multiple steady states.

  8. Heat pipe reactors for space power applications

    Science.gov (United States)

    Koenig, D. R.; Ranken, W. A.; Salmi, E. W.

    1977-01-01

    A family of heat pipe reactors design concepts has been developed to provide heat to a variety of electrical conversion systems. Three power plants are described that span the power range 1-500 kWe and operate in the temperature range 1200-1700 K. The reactors are fast, compact, heat-pipe cooled, high-temperature nuclear reactors fueled with fully enriched refractory fuels, UC-ZrC or UO2. Each fuel element is cooled by an axially located molybdenum heat pipe containing either sodium or lithium vapor. Virtues of the reactor designs are the avoidance of single-point failure mechanisms, the relatively high operating temperature, and the expected long lifetimes of the fuel element components.

  9. Reactor Antineutrinos: From Confusion to Clarity

    Science.gov (United States)

    Dwyer, Dan

    2016-09-01

    Antineutrinos emitted by nuclear reactors have been a powerful tool for particle physics, demonstrating the existence of these weakly-interacting particles as well as their flavor oscillation. Despite these successes, our understanding of the total flux and energy spectra of reactor antineutrinos has been fraught with problems. I will give a brief overview of the unexpected developments in this field, and discuss upcoming measurements of antineutrinos, beta decays, and nuclear fission which are relevant to these questions. These measurements are expected to clarify many currently murky issues, including the hypothetical oscillation of reactor antineutrinos to sterile states. The results should also provide a unique perspective into the nuclear physics of fission reactors. DOE OHEP DE-AC02-05CH11231.

  10. Chemical reactor modeling multiphase reactive flows

    CERN Document Server

    Jakobsen, Hugo A

    2014-01-01

    Chemical Reactor Modeling closes the gap between Chemical Reaction Engineering and Fluid Mechanics.  The second edition consists of two volumes: Volume 1: Fundamentals. Volume 2: Chemical Engineering Applications In volume 1 most of the fundamental theory is presented. A few numerical model simulation application examples are given to elucidate the link between theory and applications. In volume 2 the chemical reactor equipment to be modeled are described. Several engineering models are introduced and discussed. A survey of the frequently used numerical methods, algorithms and schemes is provided. A few practical engineering applications of the modeling tools are presented and discussed. The working principles of several experimental techniques employed in order to get data for model validation are outlined. The monograph is based on lectures regularly taught in the fourth and fifth years graduate courses in transport phenomena and chemical reactor modeling, and in a post graduate course in modern reactor m...

  11. µ-reactors for Heterogeneous Catalysis

    DEFF Research Database (Denmark)

    Jensen, Robert

    catalyst surface area by reacting off an adsorbed layer of oxygen with CO. This procedure can be performed at temperatures low enough that sintering of Pt nanoparticles is not an issue. Some results from the reactors are presented. In particular an unexpected oscillation phenomenon of CO-oxidation on Pt...... nanoparticles are presented in detail. The sensitivity of the reactors are currently being investigated with CO oxidation on Pt thin films as a test reaction, and the results so far are presented. We have at this point shown that we are able to reach full conversion with a catalyst area of 38 µm2 with a turn......This thesis is the summary of my work on the µ-reactor platform. The concept of µ-reactors is presented and some of the experimental challenges are outlined. The various experimental issues regarding the platform are discussed and the actual implementation of three generations of the setup...

  12. Corrosion Minimization for Research Reactor Fuel

    Energy Technology Data Exchange (ETDEWEB)

    Eric Shaber; Gerard Hofman

    2005-06-01

    Existing university research reactors are being converted to use low-enriched uranium fue to eliminate the use of highly-enriched uranium. These conversions require increases in fuel loading that will result in the use of elements with more fuel plates, resulting in a net decrease in the water annulus between fuel plates. The proposed decrease in the water annulus raises questions about the requirements and stability of the surface hydroxide on the aluminum fuel cladding and the potential for runaway corrosion resulting in fuel over-temperature incidents. The Nuclear Regulatory Commission (NRC), as regulator for these university reactors, must ensure that proposed fuel modifications will not result in any increased risk or hazard to the reactor operators or the public. This document reviews the characteristics and behavior of aluminum hydroxides, analyzes the drivers for fuel plate corrosion, reviews relevant historical incidents, and provides recommendations on fuel design, surface treatment, and reactor operational practices to avoid corrosion issues.

  13. Interactions of Pellet with Reactor Relevant Plasma

    Institute of Scientific and Technical Information of China (English)

    PENGLilin; DENGBaiquan; YANJiancheng

    2003-01-01

    Extended algorithm has been developed for ablation rate calculations of Li, Be, B impurity pellets and five combinations of solid isotopic hydrogenic H2, HD, D2, DT, T2 pellets. Numerical calculations have been performed for reactor relevant plasma.

  14. Autonomous Control of Space Nuclear Reactors Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Nuclear reactors to support future lunar and Mars robotic and manned missions impose new and innovative technological requirements for their control and protection...

  15. Advanced Test Reactor National Scientific User Facility

    Energy Technology Data Exchange (ETDEWEB)

    Frances M. Marshall; Jeff Benson; Mary Catherine Thelen

    2011-08-01

    The Advanced Test Reactor (ATR), at the Idaho National Laboratory (INL), is a large test reactor for providing the capability for studying the effects of intense neutron and gamma radiation on reactor materials and fuels. The ATR is a pressurized, light-water, high flux test reactor with a maximum operating power of 250 MWth. The INL also has several hot cells and other laboratories in which irradiated material can be examined to study material irradiation effects. In 2007 the US Department of Energy (DOE) designated the ATR as a National Scientific User Facility (NSUF) to facilitate greater access to the ATR and the associated INL laboratories for material testing research by a broader user community. This paper highlights the ATR NSUF research program and the associated educational initiatives.

  16. EMERGING TECHNOLOGY BULLETIN: SPOUTED BED REACTOR

    Science.gov (United States)

    The Spouted Bed Reactor (SBR) technology utilizes the unique attributes of the "spouting " fluidization regime, which can provide heat transfer rates comparable to traditional fluid beds, while providing robust circulation of highly heterogeneous solids, concurrent with very agg...

  17. Molten salt reactors - safety options galore

    Energy Technology Data Exchange (ETDEWEB)

    Gat, U. [Oak Ridge National Lab., TN (United States); Dodds, H.L. [Univ. of Tennessee, Knoxville, TN (United States)

    1997-03-01

    Safety features and attributes of molten salt reactors (MSR) are described. The unique features of fluid fuel reactors of on-line continuous processing and the ability for so-called external cooling result in simple and safe designs with low excess reactivity, low fission product inventory, and small source term. These, in turn, make a criticality accident unlikely and reduce the severity of a loss of coolant to where they are no longer severe accidents. A melt down is not an accident for a reactor that uses molten fuel. The molten salts are stable, non-reactive and efficient heat transfer media that operate at high temperatures at low pressures and are highly compatible with selected structural materials. All these features reduce the accident plethora. Freeze valves can be used for added safety. An ultimate safe reactor (U.S.R) is described with safety features that are passive, inherent and non-tamperable (PINT).

  18. Steady State Analysis of Small Molten Salt Reactor : Effect of Fuel Salt Flow on Reactor Characteristics

    OpenAIRE

    Yamamoto, Takahisa; MITACHI, Koshi; Suzuki, Takashi

    2005-01-01

    The Molten Salt Reactor (MSR) is a thermal neutron reactor with graphite moderation and operates on the thorium-uranium fuel cycle. The feature of the MSR is that fuel salt flows inside the reactor during the nuclear fission reaction. In the previous study, the authors developed numerical model with which to simulate the effects of fuel salt flow on the reactor characteristics. In this study, we apply the model to the steady-state analysis of a small MSR system and estimate the effects of fue...

  19. Development of technology for next generation reactor - Development of next generation reactor in Korea -

    Energy Technology Data Exchange (ETDEWEB)

    Park, Jong Kyun; Chang, Moon Heuy; Hwang, Yung Dong [Korea Atomic Energy Research Institute, Taejon (Korea, Republic of)] [and others

    1993-09-01

    The project, development of next generation reactor, aims overall related technology development and obtainment of related license in 2001. The development direction is to determine the reactor type and to build up the design concept in 1994. For development trend analysis of foreign next generation reactor, level-1 PSA, fuel cycle analysis and computer code development are performed on System 80+ and AP 600. Especially for design characteristics analysis and volume upgrade of AP 600, nuclear fuel and reactor core design analysis, coolant circuit design analysis, mechanical structure design analysis and safety analysis etc. are performed. (Author).

  20. A fast and flexible reactor physics model for simulating neutron spectra and depletion in fast reactors

    Science.gov (United States)

    Recktenwald, Geoff; Deinert, Mark

    2010-03-01

    Determining the time dependent concentration of isotopes within a nuclear reactor core is central to the analysis of nuclear fuel cycles. We present a fast, flexible tool for determining the time dependent neutron spectrum within fast reactors. The code (VBUDS: visualization, burnup, depletion and spectra) uses a two region, multigroup collision probability model to simulate the energy dependent neutron flux and tracks the buildup and burnout of 24 actinides, as well as fission products. While originally developed for LWR simulations, the model is shown to produce fast reactor spectra that show high degree of fidelity to available fast reactor benchmarks.

  1. Developments and Tendencies in Fission Reactor Concepts

    Science.gov (United States)

    Adamov, E. O.; Fuji-Ie, Y.

    This chapter describes, in two parts, new-generation nuclear energy systems that are required to be in harmony with nature and to make full use of nuclear resources. The issues of transmutation and containment of radioactive waste will also be addressed. After a short introduction to the first part, Sect. 58.1.2 will detail the requirements these systems must satisfy on the basic premise of peaceful use of nuclear energy. The expected designs themselves are described in Sect. 58.1.3. The subsequent sections discuss various types of advanced reactor systems. Section 58.1.4 deals with the light water reactor (LWR) whose performance is still expected to improve, which would extend its application in the future. The supercritical-water-cooled reactor (SCWR) will also be shortly discussed. Section 58.1.5 is mainly on the high temperature gas-cooled reactor (HTGR), which offers efficient and multipurpose use of nuclear energy. The gas-cooled fast reactor (GFR) is also included. Section 58.1.6 focuses on the sodium-cooled fast reactor (SFR) as a promising concept for advanced nuclear reactors, which may help both to achieve expansion of energy sources and environmental protection thus contributing to the sustainable development of mankind. The molten-salt reactor (MSR) is shortly described in Sect. 58.1.7. The second part of the chapter deals with reactor systems of a new generation, which are now found at the research and development (R&D) stage and in the medium term of 20-30 years can shape up as reliable, economically efficient, and environmentally friendly energy sources. They are viewed as technologies of cardinal importance, capable of resolving the problems of fuel resources, minimizing the quantities of generated radioactive waste and the environmental impacts, and strengthening the regime of nonproliferation of the materials suitable for nuclear weapons production. Particular attention has been given to naturally safe fast reactors with a closed fuel cycle (CFC

  2. A comparison of radioactive waste from first generation fusion reactors and fast fission reactors with actinide recycling

    Energy Technology Data Exchange (ETDEWEB)

    Koch, M.; Kazimi, M.S.

    1991-04-01

    Limitations of the fission fuel resources will presumably mandate the replacement of thermal fission reactors by fast fission reactors that operate on a self-sufficient closed fuel cycle. This replacement might take place within the next one hundred years, so the direct competitors of fusion reactors will be fission reactors of the latter rather than the former type. Also, fast fission reactors, in contrast to thermal fission reactors, have the potential for transmuting long-lived actinides into short-lived fission products. The associated reduction of the long-term activation of radioactive waste due to actinides makes the comparison of radioactive waste from fast fission reactors to that from fusion reactors more rewarding than the comparison of radioactive waste from thermal fission reactors to that from fusion reactors. Radioactive waste from an experimental and a commercial fast fission reactor and an experimental and a commercial fusion reactor has been characterized. The fast fission reactors chosen for this study were the Experimental Breeder Reactor 2 and the Integral Fast Reactor. The fusion reactors chosen for this study were the International Thermonuclear Experimental Reactor and a Reduced Activation Ferrite Helium Tokamak. The comparison of radioactive waste parameters shows that radioactive waste from the experimental fast fission reactor may be less hazardous than that from the experimental fusion reactor. Inclusion of the actinides would reverse this conclusion only in the long-term. Radioactive waste from the commercial fusion reactor may always be less hazardous than that from the commercial fast fission reactor, irrespective of the inclusion or exclusion of the actinides. The fusion waste would even be far less hazardous, if advanced structural materials, like silicon carbide or vanadium alloy, were employed.

  3. Environmental Information Document: L-reactor reactivation

    Energy Technology Data Exchange (ETDEWEB)

    Mackey, H.E. Jr. (comp.)

    1982-04-01

    Purpose of this Environmental Information Document is to provide background for assessing environmental impacts associated with the renovation, restartup, and operation of L Reactor at the Savannah River Plant (SRP). SRP is a major US Department of Energy installation for the production of nuclear materials for national defense. The purpose of the restart of L Reactor is to increase the production of nuclear weapons materials, such as plutonium and tritium, to meet projected needs in the nuclear weapons program.

  4. Oscillation Parameters with forthcoming Reactor Neutrino Experiments

    CERN Document Server

    Lasserre, Thierry

    2010-01-01

    I review the status of the forthcoming reactor neutrino experiments that toe the cutting edge of neutrino oscillation research. Kilometer baseline oscillation experiments (Double Chooz, Daya Bay, and Reno) will soon play a relevant role providing clean information on the last undetermined neutrino mixing angle !13. A 50-70 km baseline reactor neutrino experiment could later provide the best sensitivity to the !12 mixing angle.

  5. Advanced Reactors Transition Program Resource Loaded Schedule

    Energy Technology Data Exchange (ETDEWEB)

    GANTT, D.A.

    2000-01-12

    The Advanced Reactors Transition (ART) Resource Loaded Schedule (RLS) provides a cost and schedule baseline for managing the project elements within the ART Program. The Fast Flux Test Facility (FETF) activities are delineated through the end of FY 2000, assuming continued standby. The Nuclear Energy (NE) Legacies and Plutonium Recycle Test Reactor (PRTR) activities are delineated through the end of the deactivation process. This revision reflects the 19 Oct 1999 baseline.

  6. Advanced Reactors Transition Program Resource Loaded Schedule

    Energy Technology Data Exchange (ETDEWEB)

    BOWEN, W.W.

    1999-11-08

    The Advanced Reactors Transition (ART) Resource Loaded Schedule (RLS) provides a cost and schedule baseline for managing the project elements within the ART Program. The Fast Flux Test Facility (FFTF) activities are delineated through the end of FY 2000, assuming continued standby. The Nuclear Energy (NE) Legacies and Plutonium Recycle Test Reactor (PRTR) activities are delineated through the end of the deactivation process. This document reflects the 1 Oct 1999 baseline.

  7. The Daya Bay Reactor Neutrino Experiment

    Institute of Scientific and Technical Information of China (English)

    2012-01-01

    On Aug.15, 201l, a new large-scale scientific facility in China, Daya Bay Reactor Neutrino Experiment, started to operate. It is located in Daya Bay Nuclear Power Plant in Guangdong Province, around 50kin to both Hong Kong and Shenzhen City. The main scientific goal is to precisely determine the neutrino mixing angle 013 by detecting neutrinos from the reactors at different distances.

  8. Design of an Organic Simplified Nuclear Reactor

    OpenAIRE

    Koroush Shirvan; Eric Forrest

    2016-01-01

    Numerous advanced reactor concepts have been proposed to replace light water reactors ever since their establishment as the dominant technology for nuclear energy production. While most designs seek to improve cost competitiveness and safety, the implausibility of doing so with affordable materials or existing nuclear fuel infrastructure reduces the possibility of near-term deployment, especially in developing countries. The organic nuclear concept, first explored in the 1950s, offers an attr...

  9. Strengthening IAEA Safeguards for Research Reactors

    Energy Technology Data Exchange (ETDEWEB)

    Reid, Bruce D. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Anzelon, George A. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Budlong-Sylvester, Kory [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2016-09-01

    During their December 10-11, 2013, workshop in Grenoble France, which focused on the history and future of safeguarding research reactors, the United States, France and the United Kingdom (UK) agreed to conduct a joint study exploring ways to strengthen the IAEA’s safeguards approach for declared research reactors. This decision was prompted by concerns about: 1) historical cases of non-compliance involving misuse (including the use of non-nuclear materials for production of neutron generators for weapons) and diversion that were discovered, in many cases, long after the violations took place and as part of broader pattern of undeclared activities in half a dozen countries; 2) the fact that, under the Safeguards Criteria, the IAEA inspects some reactors (e.g., those with power levels under 25 MWt) less than once per year; 3) the long-standing precedent of States using heavy water research reactors (HWRR) to produce plutonium for weapons programs; 4) the use of HEU fuel in some research reactors; and 5) various technical characteristics common to some types of research reactors that could provide an opportunity for potential proliferators to misuse the facility or divert material with low probability of detection by the IAEA. In some research reactors, for example, such characteristics include rapid on-line refueling, and a core design with room for such a large number of assemblies or targets that it is difficult to detect diversion or undeclared irradiation. In addition, infrastructure associated with research reactors, such as hot cells, where plutonium could be separated, could pose a safeguards challenge because, in some cases, they are not declared (because they are not located in the facility or because nuclear materials are not foreseen to be processed inside) and may not be accessible to inspectors in States without an Additional Protocol in force.

  10. Current status of fast reactor physics

    Energy Technology Data Exchange (ETDEWEB)

    Hummel, H.H.

    1979-01-01

    The subject of calculation of reactivity coefficients for fast reactors is developed, starting with a discussion of the status of relevant nuclear data and proceeding to the subjects of group cross section generation and of methods of obtaining reactivity coefficients from group cross sections. Reactivity coefficients measured in critical experiments are compared with calculated values. Dependence of reactivity coefficients on reactor design is discussed. Finally, results of the recent international comparison of calculated reactivity coefficients are presented.

  11. Automatic safety rod for reactors. [LMFBR

    Science.gov (United States)

    Germer, J.H.

    1982-03-23

    An automatic safety rod for a nuclear reactor containing neutron absorbing material and designed to be inserted into a reactor core after a loss-of-flow. Actuation is based upon either a sudden decrease in core pressure drop or the pressure drop decreases below a predetermined minimum value. The automatic control rod includes a pressure regulating device whereby a controlled decrease in operating pressure due to reduced coolant flow does not cause the rod to drop into the core.

  12. Monitoring and control of anaerobic reactors

    DEFF Research Database (Denmark)

    Pind, Peter Frode; Angelidaki, Irini; Ahring, Birgitte Kiær;

    2003-01-01

    control approaches that have been used are comprehensively described. These include simple and adaptive controllers, as well as more recent developments such as fuzzy controllers, knowledge-based controllers and controllers based on neural networks.......The current status in monitoring and control of anaerobic reactors is reviewed. The influence of reactor design and waste composition on the possible monitoring and control schemes is examined. After defining the overall control structure, and possible control objectives, the possible process...

  13. COUPLED FAST-THERMAL POWER BREEDER REACTOR

    Science.gov (United States)

    Avery, R.

    1961-07-18

    A nuclear reactor having a region operating predominantly on fast neutrons and another region operating predominantly on slow neutrons is described. The fast region is a plutonium core and the slow region is a natural uranium blanket around the core. Both of these regions are free of moderator. A moderating reflector surrounds the uranium blanket. The moderating material and thickness of the reflector are selected so that fissions in the uranium blanket make a substantial contribution to the reactivity of the reactor.

  14. Short-baseline reactor neutrino oscillations

    Energy Technology Data Exchange (ETDEWEB)

    Mariani, C. [Department of Physics, Columbia University, New York, NY 10027 (United States)

    2011-08-15

    The neutrino mixing angle {theta}13 is currently a high-priority topic in the field of neutrino physics, with three different reactor neutrino experiments under way, searching for neutrino oscillations induced by this angle. A description of the reactor experiments searching for a non-zero value of {theta}13 is given, together with a discussion of their sensitivity within the next few years.

  15. Reactor Simulator Integration and Testing

    Science.gov (United States)

    Schoenfield, M. P.; Webster, K. L.; Pearson, J. B.

    2013-01-01

    As part of the Nuclear Systems Office Fission Surface Power Technology Demonstration Unit (TDU) project, a reactor simulator (RxSim) test loop was designed and built to perform integrated testing of the TDU components. In particular, the objectives of RxSim testing were to verify the operation of the core simulator, the instrumentation and control system, and the ground support gas and vacuum test equipment. In addition, it was decided to include a thermal test of a cold trap purification design and a pump performance test at pump voltages up to 150 V because the targeted mass flow rate of 1.75 kg/s was not obtained in the RxSim at the originally constrained voltage of 120 V. This Technical Memorandum summarizes RxSim testing. The gas and vacuum ground support test equipment performed effectively in NaK fill, loop pressurization, and NaK drain operations. The instrumentation and control system effectively controlled loop temperature and flow rates or pump voltage to targeted settings. The cold trap design was able to obtain the targeted cold temperature of 480 K. An outlet temperature of 636 K was obtained, which was lower than the predicted 750 K but 156 K higher than the cold temperature, indicating the design provided some heat regeneration. The annular linear induction pump tested was able to produce a maximum flow rate of 1.53 kg/s at 800 K when operated at 150 V and 53 Hz.

  16. Solid oxide electrochemical reactor science.

    Energy Technology Data Exchange (ETDEWEB)

    Sullivan, Neal P. (Colorado School of Mines, Golden, CO); Stechel, Ellen Beth; Moyer, Connor J. (Colorado School of Mines, Golden, CO); Ambrosini, Andrea; Key, Robert J. (Colorado School of Mines, Golden, CO)

    2010-09-01

    Solid-oxide electrochemical cells are an exciting new technology. Development of solid-oxide cells (SOCs) has advanced considerable in recent years and continues to progress rapidly. This thesis studies several aspects of SOCs and contributes useful information to their continued development. This LDRD involved a collaboration between Sandia and the Colorado School of Mines (CSM) ins solid-oxide electrochemical reactors targeted at solid oxide electrolyzer cells (SOEC), which are the reverse of solid-oxide fuel cells (SOFC). SOECs complement Sandia's efforts in thermochemical production of alternative fuels. An SOEC technology would co-electrolyze carbon dioxide (CO{sub 2}) with steam at temperatures around 800 C to form synthesis gas (H{sub 2} and CO), which forms the building blocks for a petrochemical substitutes that can be used to power vehicles or in distributed energy platforms. The effort described here concentrates on research concerning catalytic chemistry, charge-transfer chemistry, and optimal cell-architecture. technical scope included computational modeling, materials development, and experimental evaluation. The project engaged the Colorado Fuel Cell Center at CSM through the support of a graduate student (Connor Moyer) at CSM and his advisors (Profs. Robert Kee and Neal Sullivan) in collaboration with Sandia.

  17. Thermal-hydraulic interfacing code modules for CANDU reactors

    Energy Technology Data Exchange (ETDEWEB)

    Liu, W.S.; Gold, M.; Sills, H. [Ontario Hydro Nuclear, Toronto (Canada)] [and others

    1997-07-01

    The approach for CANDU reactor safety analysis in Ontario Hydro Nuclear (OHN) and Atomic Energy of Canada Limited (AECL) is presented. Reflecting the unique characteristics of CANDU reactors, the procedure of coupling the thermal-hydraulics, reactor physics and fuel channel/element codes in the safety analysis is described. The experience generated in the Canadian nuclear industry may be useful to other types of reactors in the areas of reactor safety analysis.

  18. Development of computer simulator for coal liquefaction reactor

    Energy Technology Data Exchange (ETDEWEB)

    Yawata, T.; Kobayashi, M.; Ohi, S.; Itho, H.; Hiraide, M. [Nippon Oil Co., Ltd., Tokyo (Japan)

    1995-12-31

    The computer simulator for a coal liquefaction reactor is a useful engineering tool to analyse the data of such reactors. The authors applied this technique to a reactor in the NEDOL process to predict the performance of the reactor, and to assist in the design of a reactor for demonstration plant. The development program of the simulator and its utilization plan are discussed. 4 figs., 2 tabs.

  19. Optimally moderated nuclear fission reactor and fuel source therefor

    Science.gov (United States)

    Ougouag, Abderrafi M.; Terry, William K.; Gougar, Hans D.

    2008-07-22

    An improved nuclear fission reactor of the continuous fueling type involves determining an asymptotic equilibrium state for the nuclear fission reactor and providing the reactor with a moderator-to-fuel ratio that is optimally moderated for the asymptotic equilibrium state of the nuclear fission reactor; the fuel-to-moderator ratio allowing the nuclear fission reactor to be substantially continuously operated in an optimally moderated state.

  20. Design options for a bunsen reactor.

    Energy Technology Data Exchange (ETDEWEB)

    Moore, Robert Charles

    2013-10-01

    This work is being performed for Matt Channon Consulting as part of the Sandia National Laboratories New Mexico Small Business Assistance Program (NMSBA). Matt Channon Consulting has requested Sandia's assistance in the design of a chemical Bunsen reactor for the reaction of SO2, I2 and H2O to produce H2SO4 and HI with a SO2 feed rate to the reactor of 50 kg/hour. Based on this value, an assumed reactor efficiency of 33%, and kinetic data from the literature, a plug flow reactor approximately 1%E2%80%9D diameter and and 12 inches long would be needed to meet the specification of the project. Because the Bunsen reaction is exothermic, heat in the amount of approximately 128,000 kJ/hr would need to be removed using a cooling jacket placed around the tubular reactor. The available literature information on Bunsen reactor design and operation, certain support equipment needed for process operation and a design that meet the specification of Matt Channon Consulting are presented.

  1. Decommissioning of the Salaspils Research Reactor

    Directory of Open Access Journals (Sweden)

    Abramenkovs Andris

    2011-01-01

    Full Text Available In May 1995, the Latvian government decided to shut down the Salaspils Research Reactor and to dispense with nuclear energy in the future. The reactor has been out of operation since July 1998. A conceptual study on the decommissioning of the Salaspils Research Reactor was drawn up by Noell-KRC-Energie- und Umwelttechnik GmbH in 1998-1999. On October 26th, 1999, the Latvian government decided to start the direct dismantling to “green-field” in 2001. The upgrading of the decommissioning and dismantling plan was carried out from 2003-2004, resulting in a change of the primary goal of decommissioning. Collecting and conditioning of “historical” radioactive wastes from different storages outside and inside the reactor hall became the primary goal. All radioactive materials (more than 96 tons were conditioned for disposal in concrete containers at the radioactive wastes depository “Radons” at the Baldone site. Protective and radiation measurement equipment of the personnel was upgraded significantly. All non-radioactive equipment and materials outside the reactor buildings were released for clearance and dismantled for reuse or conventional disposal. Contaminated materials from the reactor hall were collected and removed for clearance measurements on a weekly basis.

  2. MOX in reactors: present and future

    Energy Technology Data Exchange (ETDEWEB)

    Arslan, Marc; Gros, Jean Pierre [AREVA NC - 33 rue La Fayette, 75009 Paris (France); Niquille, Aurelie; Marincic, Alexis [AREVA NP - Tour AREVA, 1 Place Jean Millier 92084 Paris La Defense (France)

    2010-07-01

    In Europe, MOX fuel has been supplied by AREVA for more than 30 years, to 36 reactors: 21 in France, 10 in Germany, 3 in Switzerland, 2 in Belgium. For the present and future, recycling is compulsory in the frame of sustainable development of nuclear energy. By 2030 the overall volume of used fuel will reach about 400 000 t worldwide. Their plutonium and uranium content represents a huge resource of energy to recycle. That is the reason why, the European Utilities issued an EUR (European Utilities Requirement) demanding new builds reactors to be able of using MOX Fuel Assemblies in up to 50 % of the core. AREVA GEN3+ reactors, like EPR{sup TM} or ATMEA{sup TM} designed with MHI partnership, are designed to answer any utility need of MOX recycling. The example of the EPR{sup TM} reactor operated with 100 % MOX core optimized for MOX recycling will be presented. A standard EPR{sup TM} can be operated with 100 % MOX core using an advanced homogeneous MOX (single Pu content) with highly improved performances (burn-up and Cycle length). The adaptations needed and the main operating and safety reactor features will be presented. AREVA offers the utilities throughout the world, fuel supply (UO{sub 2}, ERU, MOX), and reactors designed with all the needed capability for recycling. For each country and each utility, an adapted global solution, competitive and non proliferant can be proposed. (authors)

  3. Moving hot cell for LMFBR type reactor

    Energy Technology Data Exchange (ETDEWEB)

    Kanbe, Mitsuru

    1994-09-16

    A moving hot cell for an LMFBR type reactor is made movable on a reactor operation floor between a position just above the reactor container and a position retreated therefrom. Further, it comprises an overhung portion which can incorporate a spent fuel just thereunder, and a crane for moving a fuel assembly between a spent fuel cask and a reactor container. Further, an opening/closing means having a shielding structure is disposed to the bottom portion and the overhung portion thereof, to provide a sealing structure, in which only the receiving port for the spent fuel cask faces to the inner side, and the cask itself is disposed at the outside. Upon exchange of fuels, the movable hot cell is placed just above the reactor to take out the spent fuels, so that a region contaminated with primary sodium is limited within the hot cell. On the other hand, upon maintenance and repair for equipments, the hot cell is moved, thereby enabling to provide a not contaminated reactor operation floor. (N.H.).

  4. Supply of enriched uranium for research reactors

    Energy Technology Data Exchange (ETDEWEB)

    Mueller, H. [NUKEM GmbH, Alzenau (Germany)

    1997-08-01

    Since the RERTR-meeting In Newport/USA in 1990 the author delivered a series of papers in connection with the fuel cycle for research reactors dealing with its front-end. In these papers the author underlined the need for unified specifications for enriched uranium metal suitable for the production of fuel elements and made proposals with regard to the re-use of in Europe reprocessed highly enriched uranium. With regard to the fuel cycle of research reactors the research reactor community was since 1989 more concentrating on the problems of its back-end since the USA stopped the acceptance of spent research reactor fuel on December 31, 1988. Now, since it is apparent that these back-end problem have been solved by AEA`s ability to reprocess and the preparedness of the USA to again accept physically spent research reactor fuel the author is focusing with this paper again on the front-end of the fuel cycle on the question whether there is at all a safe supply of low and high enriched uranium for research reactors in the future.

  5. A nanoliter-scale open chemical reactor.

    Science.gov (United States)

    Galas, Jean-Christophe; Haghiri-Gosnet, Anne-Marie; Estévez-Torres, André

    2013-02-01

    An open chemical reactor is a container that exchanges matter with the exterior. Well-mixed open chemical reactors, called continuous stirred tank reactors (CSTR), have been instrumental for investigating the dynamics of out-of-equilibrium chemical processes, such as oscillations, bistability, and chaos. Here, we introduce a microfluidic CSTR, called μCSTR, that reduces reagent consumption by six orders of magnitude. It consists of an annular reactor with four inlets and one outlet fabricated in PDMS using multi-layer soft lithography. A monolithic peristaltic pump feeds fresh reagents into the reactor through the inlets. After each injection the content of the reactor is continuously mixed with a second peristaltic pump. The efficiency of the μCSTR is experimentally characterized using a bromate, sulfite, ferrocyanide pH oscillator. Simulations accounting for the digital injection process are in agreement with experimental results. The low consumption of the μCSTR will be advantageous for investigating out-of-equilibrium dynamics of chemical processes involving biomolecules. These studies have been scarce so far because a miniaturized version of a CSTR was not available.

  6. Uncertainty quantification approaches for advanced reactor analyses.

    Energy Technology Data Exchange (ETDEWEB)

    Briggs, L. L.; Nuclear Engineering Division

    2009-03-24

    The original approach to nuclear reactor design or safety analyses was to make very conservative modeling assumptions so as to ensure meeting the required safety margins. Traditional regulation, as established by the U. S. Nuclear Regulatory Commission required conservatisms which have subsequently been shown to be excessive. The commission has therefore moved away from excessively conservative evaluations and has determined best-estimate calculations to be an acceptable alternative to conservative models, provided the best-estimate results are accompanied by an uncertainty evaluation which can demonstrate that, when a set of analysis cases which statistically account for uncertainties of all types are generated, there is a 95% probability that at least 95% of the cases meet the safety margins. To date, nearly all published work addressing uncertainty evaluations of nuclear power plant calculations has focused on light water reactors and on large-break loss-of-coolant accident (LBLOCA) analyses. However, there is nothing in the uncertainty evaluation methodologies that is limited to a specific type of reactor or to specific types of plant scenarios. These same methodologies can be equally well applied to analyses for high-temperature gas-cooled reactors and to liquid metal reactors, and they can be applied to steady-state calculations, operational transients, or severe accident scenarios. This report reviews and compares both statistical and deterministic uncertainty evaluation approaches. Recommendations are given for selection of an uncertainty methodology and for considerations to be factored into the process of evaluating uncertainties for advanced reactor best-estimate analyses.

  7. Antineutrino reactor safeguards - a case study

    CERN Document Server

    Christensen, Eric; Jaffke, Patrick

    2013-01-01

    Antineutrinos have been proposed as a means of reactor safeguards for more than 30 years and there has been impressive experimental progress in neutrino detection. In this paper we conduct, for the first time, a case study of the application of antineutrino safeguards to a real-world scenario - the North Korean nuclear crisis in 1994. We derive detection limits to a partial or full core discharge in 1989 based on actual IAEA safeguards access and find that two independent methods would have yielded positive evidence for a second core with very high confidence. To generalize our results, we provide detailed estimates for the sensitivity to the plutonium content of various types of reactors, including most types of plutonium production reactors, based on detailed reactor simulations. A key finding of this study is that a wide class of reactors with a thermal power of less than 0.1-1 GWth can be safeguarded achieving IAEA goals for quantitative sensitivity and timeliness with detectors right outside the reactor ...

  8. FBR and RBR particle bed space reactors

    Energy Technology Data Exchange (ETDEWEB)

    Powell, J.R.; Botts, T.E.

    1983-01-01

    Compact, high-performance nuclear reactor designs based on High-Temperature Gas Reactors (HTGRs) particulate fuel are investigated. The large surface area available with the small-diameter (approx. 500 microns) particulate fuel allows very high power densities (MW's/liter), small temperature differences between fuel and coolant (approx. 10/sup 0/K), high coolant-outlet temperatures (1500 to 3000/sup 0/K, depending on design), and fast reactor startup (approx. 2 to 3 seconds). Two reactor concepts are developed - the Fixed Bed Reactor (FBR), where the fuel particles are packed into a thin annular bed between two porous cylindrical drums, and the Rotating Bed Reactor (RBR), where the fuel particles are held inside a cold rotating (typically approx. 500 rpm) porous cylindrical drum. The FBR can operate steady-state in the closed-cycle He-cooled mode or in the open-cycle H/sub 2/-cooled mode. The RBR will operate only in the open-cycle H/sub 2/-cooled mode.

  9. Technology, Safety and Costs of Decommissioning Nuclear Reactors At Multiple-Reactor Stations

    Energy Technology Data Exchange (ETDEWEB)

    Wittenbrock, N. G.

    1982-01-01

    Safety and cost information is developed for the conceptual decommissioning of large (1175-MWe) pressurized water reactors (PWRs) and large (1155-MWe) boiling water reactors {BWRs) at multiple-reactor stations. Three decommissioning alternatives are studied: DECON (immediate decontamination), SAFSTOR (safe storage followed by deferred decontamination), and ENTOMB (entombment). Safety and costs of decommissioning are estimated by determining the impact of probable features of multiple-reactor-station operation that are considered to be unavailable at a single-reactor station, and applying these estimated impacts to the decommissioning costs and radiation doses estimated in previous PWR and BWR decommissioning studies. The multiple-reactor-station features analyzed are: the use of interim onsite nuclear waste storage with later removal to an offsite nuclear waste disposal facility, the use of permanent onsite nuclear waste disposal, the dedication of the site to nuclear power generation, and the provision of centralized services. Five scenarios for decommissioning reactors at a multiple-reactor station are investigated. The number of reactors on a site is assumed to be either four or ten; nuclear waste disposal is varied between immediate offsite disposal, interim onsite storage, and immediate onsite disposal. It is assumed that the decommissioned reactors are not replaced in one scenario but are replaced in the other scenarios. Centralized service facilities are provided in two scenarios but are not provided in the other three. Decommissioning of a PWR or a BWR at a multiple-reactor station probably will be less costly and result in lower radiation doses than decommissioning an identical reactor at a single-reactor station. Regardless of whether the light water reactor being decommissioned is at a single- or multiple-reactor station: • the estimated occupational radiation dose for decommissioning an LWR is lowest for SAFSTOR and highest for DECON • the estimated

  10. Reactor performances and microbial communities of biogas reactors: effects of inoculum sources.

    Science.gov (United States)

    Han, Sheng; Liu, Yafeng; Zhang, Shicheng; Luo, Gang

    2016-01-01

    Anaerobic digestion is a very complex process that is mediated by various microorganisms, and the understanding of the microbial community assembly and its corresponding function is critical in order to better control the anaerobic process. The present study investigated the effect of different inocula on the microbial community assembly in biogas reactors treating cellulose with various inocula, and three parallel biogas reactors with the same inoculum were also operated in order to reveal the reproducibility of both microbial communities and functions of the biogas reactors. The results showed that the biogas production, volatile fatty acid (VFA) concentrations, and pH were different for the biogas reactors with different inocula, and different steady-state microbial community patterns were also obtained in different biogas reactors as reflected by Bray-Curtis similarity matrices and taxonomic classification. It indicated that inoculum played an important role in shaping the microbial communities of biogas reactor in the present study, and the microbial community assembly in biogas reactor did not follow the niche-based ecology theory. Furthermore, it was found that the microbial communities and reactor performances of parallel biogas reactors with the same inoculum were different, which could be explained by the neutral-based ecology theory and stochastic factors should played important roles in the microbial community assembly in the biogas reactors. The Bray-Curtis similarity matrices analysis suggested that inoculum affected more on the microbial community assembly compared to stochastic factors, since the samples with different inocula had lower similarity (10-20 %) compared to the samples from the parallel biogas reactors (30 %).

  11. Total gastrectomy with substitution of stomach by jejunal pouch with and without duodenal passage: study in rats Gastrectomy total com substituição do estômago por bolsa jejunal com e sem passagem do alimento pelo duodeno: estudo em ratos

    Directory of Open Access Journals (Sweden)

    Tertuliano Aires Neto

    2005-01-01

    Full Text Available PURPOSE: A comparison was done between the F. Paulino jejunal pouch (FP and a jejunal pouch (JP as esophagus-duodenum interpositional graft, for replacing the stomach after total gastrectomy. It was investigated the effect of the two procedures on esophagus histology, nutritional state and serum gastrin in rats. METHODS: Male Wistar rats weighing 282±17g were randomly submitted to sham operation (S, FP and JP after total gastrectomy. After eight weeks the rats were killed with overdose of anesthetic and tissue was taken from the distal esophagus for histology. Serum levels of total proteins, albumin, iron, transferring, folate, cobalamine, calcium, as well as serum gastrin were determined. Survival was considered. RESULTS: Fourty six rats were operated and thirty survived for eight weeks. Five (33.3% died after FP and 11 (52.3% after JP (p0.05. The JP rats had a significant decrease in serum albumin, glucose, transferrin, iron, folate and calcium, compared to sham (pOBJETIVO: Estudo comparativo foi realizado entre a bolsa jejunal de Fernando Paulino (FP e uma bolsa jejunal (JP interposta entre o esôfago e duodeno, para substituir o estômago após gastrectomia . Foi investigado o efeito dos dois procedimentos na histologia do esôfago, estado nutricional e gastrinemia sérica em ratos. MÉTODOS: Quarenta e seis ratos Wistar pesando 282±17g foram aleatoriamente submetidos a sham operation (S, FP e JP após gastectomia total. Decorridas 8 semanas, foi colhido sangue por punção cardíaca para dosagem de proteínas totais, albumina, ferro, transferrina, folato, cobalamina, calcio, e gastrina. Os animais receberam dose letal de anestésico e tecido do esôfago terminal foi retirado para histologia. Foi observada a mortalidade operatória dos animais. RESULTADOS: Quarenta e seis ratos foram operados e 30 sobreviveram por 8 semanas. Cinco (33,3 % morreram após FP e 11 (52,3% após JP (p0.05. Os ratos submetidos a JP tiveram uma diminui

  12. Materials issues in fusion reactors

    Science.gov (United States)

    Suri, A. K.; Krishnamurthy, N.; Batra, I. S.

    2010-02-01

    The world scientific community is presently engaged in one of the toughest technological tasks of the current century, namely, exploitation of nuclear fusion in a controlled manner for the benefit of mankind. Scientific feasibility of controlled fusion of the light elements in plasma under magnetic confinement has already been proven. International efforts in a coordinated and co-operative manner are presently being made to build ITER - the International Thermonuclear Experimental Reactor - to test, in this first step, the concept of 'Tokamak' for net fusion energy production. To exploit this new developing option of making energy available through the route of fusion, India too embarked on a robust fusion programme under which we now have a working tokamak - the Aditya and a steady state tokamak (SST-1), which is on the verge of functioning. The programme envisages further development in terms of making SST-2 followed by a DEMO and finally the fusion power reactor. Further, with the participation of India in the ITER program in 2005, and recent allocation of half - a - port in ITER for placing our Lead - Lithium Ceramic Breeder (LLCB) based Test Blanket Module (TBM), meant basically for breeding tritium and extracting high grade heat, the need to understand and address issues related to materials for these complex systems has become all the more necessary. Also, it is obvious that with increasing power from the SST stages to DEMO and further to PROTOTYPE, the increasing demands on performance of materials would necessitate discovery and development of new materials. Because of the 14.1 MeV neutrons that are generated in the D+T reaction exploited in a tokamak, the materials, especially those employed for the construction of the first wall, the diverter and the blanket segments, suffer crippling damage due to the high He/dpa ratios that result due to the high energy of the neutrons. To meet this challenge, the materials that need to be developed for the tokamaks

  13. Strengthening IAEA Safeguards for Research Reactors

    Energy Technology Data Exchange (ETDEWEB)

    Reid, Bruce D. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Anzelon, George A. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Budlong-Sylvester, Kory [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2016-09-01

    During their December 10-11, 2013, workshop in Grenoble France, which focused on the history and future of safeguarding research reactors, the United States, France and the United Kingdom (UK) agreed to conduct a joint study exploring ways to strengthen the IAEA’s safeguards approach for declared research reactors. This decision was prompted by concerns about: 1) historical cases of non-compliance involving misuse (including the use of non-nuclear materials for production of neutron generators for weapons) and diversion that were discovered, in many cases, long after the violations took place and as part of broader pattern of undeclared activities in half a dozen countries; 2) the fact that, under the Safeguards Criteria, the IAEA inspects some reactors (e.g., those with power levels under 25 MWt) less than once per year; 3) the long-standing precedent of States using heavy water research reactors (HWRR) to produce plutonium for weapons programs; 4) the use of HEU fuel in some research reactors; and 5) various technical characteristics common to some types of research reactors that could provide an opportunity for potential proliferators to misuse the facility or divert material with low probability of detection by the IAEA. In some research reactors it is difficult to detect diversion or undeclared irradiation. In addition, infrastructure associated with research reactors could pose a safeguards challenge. To strengthen the effectiveness of safeguards at the State level, this paper advocates that the IAEA consider ways to focus additional attention and broaden its safeguards toolbox for research reactors. This increase in focus on the research reactors could begin with the recognition that the research reactor (of any size) could be a common path element on a large number of technically plausible pathways that must be considered when performing acquisition pathway analysis (APA) for developing a State Level Approach (SLA) and Annual Implementation Plan (AIP). To

  14. Nuclear Energy Enabling Technologies (NEET) Reactor Materials: News for the Reactor Materials Crosscut, May 2016

    Energy Technology Data Exchange (ETDEWEB)

    Maloy, Stuart Andrew [Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Materials Science in Radiation and Dynamics Extremes

    2016-09-26

    In this newsletter for Nuclear Energy Enabling Technologies (NEET) Reactor Materials, pages 1-3 cover highlights from the DOE-NE (Nuclear Energy) programs, pages 4-6 cover determining the stress-strain response of ion-irradiated metallic materials via spherical nanoindentation, and pages 7-8 cover theoretical approaches to understanding long-term materials behavior in light water reactors.

  15. Power distribution control of CANDU reactors based on modal representation of reactor kinetics

    Energy Technology Data Exchange (ETDEWEB)

    Xia, Lingzhi, E-mail: lxia4@uwo.ca [Department of Electrical and Computer Engineering, The University of Western Ontario, London, Ontario N6A 5B9 (Canada); Jiang, Jin, E-mail: jjiang@eng.uwo.ca [Department of Electrical and Computer Engineering, The University of Western Ontario, London, Ontario N6A 5B9 (Canada); Luxat, John C., E-mail: luxatj@mcmaster.ca [Department of Engineering Physics, McMaster University, Hamilton, Ontario L8S 4L7 (Canada)

    2014-10-15

    Highlights: • Linearization of the modal synthesis model of neutronic kinetic equations for CANDU reactors. • Validation of the linearized dynamic model through closed-loop simulations by using the reactor regulating system. • Design of a LQR state feedback controller for CANDU core power distribution control. • Comparison of the results of this new controller against those of the conventional reactor regulation system. - Abstract: Modal synthesis representation of a neutronic kinetic model for a CANDU reactor core has been utilized in the analysis and synthesis for reactor control systems. Among all the mode shapes, the fundamental mode of the power distribution, which also coincides with the desired reactor power distribution during operation, is used in the control system design. The nonlinear modal models are linearized around desired operating points. Based on the linearized model, linear quadratic regulator (LQR) control approach is used to synthesize a state feedback controller. The performance of this controller has been evaluated by using the original nonlinear models under load-following conditions. It has been demonstrated that the proposed reactor control system can produce more uniform power distribution than the traditional reactor regulation systems (RRS); in particular, it is more effective in compensating the Xenon induced transients.

  16. Technological status of reactor coolant pumps in generation III+ pressurized nuclear reactors

    Energy Technology Data Exchange (ETDEWEB)

    Brecht, Bernhard; Bross, Stephan [KSB Aktiengesellschaft, Frankenthal (Germany)

    2016-05-15

    KSB has been developing and producing pumps for thermal power plants for nearly 90 years. Consequently, KSB also started to develop and manufacture pumps for all kinds of nuclear power plants from the very beginning of the civil use of nuclear energy. This is especially true for reactor coolant pumps for pressurized water reactors. For the generation of advanced evolutionary reactors (Generation III+ reactors), KSB developed an advanced shaft seal system which is also able to fulfill the requirements of station blackout conditions. The tests in the KSB test rigs, which were successfully completed in December 2015, proved the full functionality of the new design. For generation III+ passive plant reactors KSB developed a new reactor coolant pump type called RUV, which is based on the experience of classic reactor coolant pumps and reactor internal pumps. It is a very compact, hermetically sealed vertical pump-motor unit with a wet winding motor. A full scale prototype successfully passed the 1st stage qualification test program in October 2015.

  17. Stationary Liquid Fuel Fast Reactor

    Energy Technology Data Exchange (ETDEWEB)

    Yang, Won Sik [Purdue Univ., West Lafayette, IN (United States); Grandy, Andrew [Argonne National Lab. (ANL), Argonne, IL (United States); Boroski, Andrew [Argonne National Lab. (ANL), Argonne, IL (United States); Krajtl, Lubomir [Argonne National Lab. (ANL), Argonne, IL (United States); Johnson, Terry [Argonne National Lab. (ANL), Argonne, IL (United States)

    2015-09-30

    For effective burning of hazardous transuranic (TRU) elements of used nuclear fuel, a transformational advanced reactor concept named SLFFR (Stationary Liquid Fuel Fast Reactor) was proposed based on stationary molten metallic fuel. The fuel enters the reactor vessel in a solid form, and then it is heated to molten temperature in a small melting heater. The fuel is contained within a closed, thick container with penetrating coolant channels, and thus it is not mixed with coolant nor flow through the primary heat transfer circuit. The makeup fuel is semi- continuously added to the system, and thus a very small excess reactivity is required. Gaseous fission products are also removed continuously, and a fraction of the fuel is periodically drawn off from the fuel container to a processing facility where non-gaseous mixed fission products and other impurities are removed and then the cleaned fuel is recycled into the fuel container. A reference core design and a preliminary plant system design of a 1000 MWt TRU- burning SLFFR concept were developed using TRU-Ce-Co fuel, Ta-10W fuel container, and sodium coolant. Conservative design approaches were adopted to stay within the current material performance database. Detailed neutronics and thermal-fluidic analyses were performed to develop a reference core design. Region-dependent 33-group cross sections were generated based on the ENDF/B-VII.0 data using the MC2-3 code. Core and fuel cycle analyses were performed in theta-r-z geometries using the DIF3D and REBUS-3 codes. Reactivity coefficients and kinetics parameters were calculated using the VARI3D perturbation theory code. Thermo-fluidic analyses were performed using the ANSYS FLUENT computational fluid dynamics (CFD) code. Figure 0.1 shows a schematic radial layout of the reference 1000 MWt SLFFR core, and Table 0.1 summarizes the main design parameters of SLFFR-1000 loop plant. The fuel container is a 2.5 cm thick cylinder with an inner radius of 87.5 cm. The fuel

  18. Design guide for category II reactors light and heavy water cooled reactors. [US DOE

    Energy Technology Data Exchange (ETDEWEB)

    Brynda, W J; Lobner, P R; Powell, R W; Straker, E A

    1978-05-01

    The Department of Energy (DOE), in the ERDA Manual, requires that all DOE-owned reactors be sited, designed, constructed, modified, operated, maintained, and decommissioned in a manner that gives adequate consideration to health and safety factors. Specific guidance pertinent to the safety of DOE-owned reactors is found in Chapter 0540 of the ERDA Manual. The purpose of this Design Guide is to provide additional guidance to aid the DOE facility contractor in meeting the requirement that the siting, design, construction, modification operation, maintainance, and decommissioning of DOW-owned reactors be in accordance with generally uniform standards, guide and codes which are comparable to those applied to similar reactors licensed by the Nuclear Regulatory Commission (NRC). This Design Guide deals principally with the design and functional requirements of Category II reactor structure, components, and systems.

  19. Design guide for Category III reactors: pool type reactors. [US DOE

    Energy Technology Data Exchange (ETDEWEB)

    Brynda, W J; Lobner, P R; Powell, R W; Straker, E A

    1978-11-01

    The Department of Energy (DOE) in the ERDA Manual requires that all DOE-owned reactors be sited, designed, constructed, modified, operated, maintained, and decommissioned in a manner that gives adequate consideration to health and safety factors. Specific guidance pertinent to the safety of DOE-owned reactors is found in Chapter 0540 of the ERDA Manual. The purpose of this Design Guide is to provide additional guidance to aid the DOE facility contractor in meeting the requirement that the siting, design, construction, modification, operation, maintenance, and decommissioning of DOE-owned reactors be in accordance with generally uniform standards, guides, and codes which are comparable to those applied to similar reactors licensed by the Nuclear Regulatory Commission (NRC). This Design Guide deals principally with the design and functional requirement of Category III reactor structures, components, and systems.

  20. Porcentagem de parênquima e índice apoptótico da bolsa cloacal em frangos de corte em ambiente de conforto e estresse térmico Parenchymal percentage and apoptotic index of cloacal bursa of broiler chickens maintained in thermal comfort or stress

    Directory of Open Access Journals (Sweden)

    E.B. Guimarães

    2003-04-01

    Full Text Available Noventa e seis pintos de corte foram mantidos em diferentes temperaturas ambientais (calor, 29ºC; neutro, 24ºC; frio, 15ºC e oito aves de cada grupo de temperatura (tratamento foram sacrificadas nos dias 1, 7, 14, 21, 28, 35 e 42, e suas bolsas cloacais (BC coletadas e processadas segundo técnica de rotina para inclusão em parafina. Cortes de 4m m, corados em HE, foram submetidos à análise histométrica utilizando-se o programa Kontron KS300, V 2.0. De cada corte foram mensurados a porcentagem de parênquima e o índice apoptótico nas BC. As médias da porcentagem de parênquima nas BC das aves com cinco semanas foram significativamente menores quando mantidas em ambiente frio (53,0%, quando comparadas com as do ambiente neutro (78,5%. As médias do índice apoptótico foram significativamente maiores nas BC de aves mantidas no ambiente frio (0,26, em relação às do neutro (0,12. Conclui-se que o estresse térmico induz apoptose de linfócitos e, conseqüentemente, hipotrofia da bolsa cloacal, alterando sua maturação.Ninety six broiler chickens were kept in climatic chambers and submitted to three different environmental temperatures 24h/day: 29ºC (hot, 24ºC (neutral and 15ºC (cold. Eight chickens of each temperature group were sacrificed at 1, 7, 14, 21, 28, 35 and 42 days, and the cloacal bursae (CB were collected, processed and embedded in paraffin. Sections were stained with HE and histometric evaluation was carried out. From each section, parenchyma ratio (PR and apoptotic index (AI were measured. The CB of five week-old chickens kept in lower temperature showed PR lower than CB of chickens kept in neutral temperature. The CB of five week-old chickens kept in lower temperature showed an AI greater than CB of chickens submitted to neutral temperature. The present study shows that environmental temperature stress induces lymphocytes apoptosis, cloacal bursae atrophy and affects CB maturation.