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Sample records for transientes em reatores

  1. Nuclear reactors transients identification and classification system; Sistema de identificacao e classificacao de transientes em reatores nucleares

    Energy Technology Data Exchange (ETDEWEB)

    Bianchi, Paulo Henrique

    2008-07-01

    This work describes the study and test of a system capable to identify and classify transients in thermo-hydraulic systems, using a neural network technique of the self-organizing maps (SOM) type, with the objective of implanting it on the new generations of nuclear reactors. The technique developed in this work consists on the use of multiple networks to do the classification and identification of the transient states, being each network a specialist at one respective transient of the system, that compete with each other using the quantization error, that is a measure given by this type of neural network. This technique showed very promising characteristics that allow the development of new functionalities in future projects. One of these characteristics consists on the potential of each network, besides responding what transient is in course, could give additional information about that transient. (author)

  2. Development of a digital card to simulate period transients in research reactors; Desenvolvimento de um cartao digital para simulacao da variacao do periodo em reatores de pesquisa

    Energy Technology Data Exchange (ETDEWEB)

    Masotti, Paulo Henrique Ferraz

    1999-07-01

    This work presents the development of a card to be used in a 'slot' of a micro-computer for evaluation of a nuclear channel used to monitor the start up of nuclear reactors. The results of the bench tests showed good linearity and 2% error deviation in the entire range of operation. Fields tests, performed with the start up channel of IEA-R1 research reactor showed that the card is an excellent device to verify the performance of the channel during steady state, and transient conditions. (author)

  3. Estudo comparativo entre reatores UASB e tanque séptico, em escala unifamiliar, no tratamento de esgoto de comunidade quilombola amazônica

    OpenAIRE

    FREITAS, Elenilce Monteiro de

    2012-01-01

    Esta pesquisa apresenta o estudo comparativo de reatores anaeróbio de fluxo ascendente e manta de lodo (UASB) e tanque séptico (TS), a fim de investigar a utilização destes reatores em escala unifamiliar no tratamento de esgotos domiciliares. A pesquisa foi realizada em comunidade quilombola próxima a cidade de Belém- PA. Para isto, foram utilizados oito reatores UASB (em forma de “Y”.) e um tanque séptico prismático de câmara única. Os reatores UASB possuíam volume de 0,42 m3, enquanto que o...

  4. Aproveitamento energético de biogás gerado em reatores UASB tratando esgoto doméstico

    OpenAIRE

    Livia Cristina da Silva Lobato

    2011-01-01

    A pesquisa teve como objetivo avaliar as principais alternativas para valorização energética do biogás produzido em reatores UASB tratando esgoto doméstico. O foco principal esteve relacionado à cogeração de energia e calor para secagem térmica e desinfecção do lodo excedente de reatores UASB. Um modelo matemático foi desenvolvido com o intuito de se estimar, com maior precisão, a parcela de DQO recuperada como metano no biogás e que, efetivamente, representasse o potencial de recuperação de ...

  5. Síntese em reator de hidrometalurgia de nanopartícula de ferrita de cobalto

    OpenAIRE

    Araújo, Elton John Nunes de

    2017-01-01

    Investigamos a síntese de nanopartículas de ferrita de cobalto por precipitação hidrotérmica, em reator de hidrometalurgia em temperaturas entre 100 e 250°C. Foram variados os parâmetros: temperatura de síntese, composição do meio reacional, concentração da base e presença de agente complexante. As nanopartículas obtidas foram caracterizadas do ponto de vista estrutural por difração de raios-X, sua composição foi verifica por medidas de espectroscopia por energia dispersiva de raios-x (EDX) e...

  6. Metodologia para determinação da taxa de prorrogação de trinca por corrosão sob tensão em solda de metais dissimilares em meio simulado de Reator Nuclear PWR

    OpenAIRE

    Raphael Gomes de Paula

    2014-01-01

    As ligas de Níquel são amplamente utilizadas na construção de diversos componentes de reatores à água pressurizada PWR. Estes materiais foram selecionados por possuírem elevada resistência mecânica e a corrosão generalizada e compatibilidade com os materiais do reator. No entanto, alguns reatores têm apresentado trincamento causado por corrosão sob tensão em soldas dissimilares efetuadas com a liga de Inconel 182, isto têm ocorrido principalmente no circuito primário. O trabalho aqui apresent...

  7. Estudo da atividade biológica das células imobilizadas em um reator anaeróbio tratando esgoto sanitário

    OpenAIRE

    Vinícius Marques de Sousa Rêgo

    2002-01-01

    Este trabalho apresenta uma análise comparativa da atividade biológica das células imobilizadas em um reator anaeróbio, tratando esgoto sanitário. Os materiais utilizados como suporte para o desenvolvimento do biofilme foram: um polimérico poroso (espuma de poliuretano), um polímero menos poroso (PVC), uma cerâmica porosa (cerâmica especial, desenvolvida pelo DEMA-UFSCar) e uma cerâmica menos porosa (tijolo refratário). A concepção do reator anaeróbio possibilitou o desenvolvimento do biofilm...

  8. Modelagem e simulação de um reator industrial de apagamento

    Directory of Open Access Journals (Sweden)

    Ricardo Andreola

    2000-05-01

    Full Text Available O sistema de reatores de caustificação é responsável pela geração do licor branco e é composto, basicamente, por um reator de apagamento, seguido por vários reatores de caustificação. No reator de apagamento, ocorre a formação de hidróxido de cálcio, segundo a reação: CaO(s + H2O(1 → Ca(OH 2 (s, e, simultaneamente, a reação de caustificação com a formação de hidróxido de sódio: Na2CO3 (aq + Ca(OH 2 (s → 2 NaOH(aq + CaCO3 (s, estendendo-se ao longo de vários reatores de mistura, dispostos em série. Neste sentido, como primeira etapa, foi elaborado e testado um modelo matemático fenomenológico do reator de apagamento em regime transiente, da indústria Klabin Paraná Papéis. O modelo foi obtido a partir de balanços de massa e de energia no reator, resultando num sistema de oito equações diferenciais ordinárias, que foram resolvidas numericamente. As simulações deste modelo, nas condições operacionais da planta, revelam que este é capaz de representar as principais tendências do processo.

  9. Tratamento de efluente sintético de laticínio em reatores em batelada inoculados com Aspergillus niger AN400

    Directory of Open Access Journals (Sweden)

    Luana Viana Costa e Silva

    2013-12-01

    Full Text Available Indústrias de laticínios contêm elevada concentração de matéria orgânica que podem causar poluição. Este trabalho propôs estudar a remoção de matéria orgânica e de nutrientes de um efluente sintético de laticínio, disposto em reatores em bateladas repetidas inoculados com Aspergillus niger AN400. O sistema foi composto por reatores com diferentes configurações e, para cada tipo de montagem, variou-se o material-suporte. O estudo foi realizado em quatro ciclos de cinco dias, com retiradas diárias de alíquotas. A análise dos resultados mostrou eficiência de remoção de demanda química de oxigênio com picos de até 71,7%, concluindo-se que a tecnologia mostrou-se viável na remoção de matéria orgânica. Em relação aos nutrientes, o sistema pôde remover satisfatoriamente nitrato; contudo, para remoção de amônia, não se apresentou promissor.

  10. Partida de reator anaeróbio compartimentado em série com um reator anaeróbio de manta de lodo, utilizando parâmetros de sedimentabilidade para formação da biomassa

    Directory of Open Access Journals (Sweden)

    Cristine Serafine Neves

    2015-12-01

    Full Text Available RESUMO Este estudo objetivou avaliar a formação da biomassa de boa qualidade tanto no reator anaeróbio compartimentado (RAC quanto no reator anaeróbio de manta de lodo (UASB, aplicando parâmetros adequados à sedimentação dos sólidos sedimentáveis (SS presentes na água residuária de suinocultura (ARS. O RAC e o UASB operaram em série com os tempos de detenção hidráulica (TDHs de 15 e 9h, respectivamente, correspondendo a cargas orgânicas volumétricas (COVs médias de 53,8 e 36,2 kg.m³.d¹ em termos de DQOT, respectivamente. As eficiências médias de remoção de DBO520°C, durante o processo de partida e formação da biomassa, foram: 68% para RAC e 55% para UASB, e em termos de DQO: 78% para RAC e 70% para UASB, respectivamente. Os autores concluíram que é possível, mediante os parâmetros de sedimentação adotados, formar uma biomassa peletizada, mesmo operando o sistema com altas cargas orgânicas.

  11. Simulação computacional do processamento catalítico do glicerol em reator de leito gotejante para a obtenção 1,2-propanodiol e etilenoglicol

    OpenAIRE

    MELO, Rafael Araújo

    2015-01-01

    O uso de sistemas contínuos é extensivamente empregado na indústria química uma vez que essa prática acarreta em processos mais eficientes que os descontínuos. No patamar atual, a reação de hidrogenólise do glicerol foi conduzida em reatores descontínuos do tipo leito de lama, tais reatores são indicados apenas para uso em produções em baixa escala como laboratórios e pequenas unidades industriais. Esse trabalho visou à possibilidade da implantação desta reação em reator de leito gotejante (c...

  12. Pós-tratamento de efluente nitrificado da parboilização de arroz utilizando desnitrificação em reator UASB Post-treatment a nitrified parboilized rice wastewater using denitrification in UASB reactor

    Directory of Open Access Journals (Sweden)

    Loraine Andre Isoldi

    2005-12-01

    Full Text Available Um sistema combinado reator UASB-reator aeróbio foi utilizado para a remoção de nitrogênio total e DQO de efluente de parboilização de arroz. O experimento foi realizado em reatores de bancada, com volumes de 4 L (UASB e 3,6 L (reator aeróbio. Os parâmetros de operação pH, temperatura, alcalinidade e concentração de ácidos voláteis foram monitorados durante o período experimental. Para o reator aeróbio de mistura completa, foi determinada, também, a concentração de oxigênio dissolvido. O sistema combinado reator UASB-reator aeróbio apresentou uma eficiência de remoção de carbono de 84% e uma eficiência de remoção de nitrogênio total Kjeldahl de 83%. O sistema proposto, nas condições experimentais, demonstrou ser adequado para remoção, simultânea, de DQO e de compostos oxidados de nitrogênio, em reator UASB.An UASB-aerobic reactor system was used for the removal of total nitrogen and COD of effluent from industries of parboilized rice. The experiment was performed in reactors with volumes of 4 L (UASB reactor and 3,6 L (aerobic reactor, respectevely. Temperature, pH, alkalinity and volatile acids concentration were monitored during the experiment. Dissolved oxygen concentration was determined for the aerobic reactor. The UASB-aerobic reactor system showed 84% carbon removal efficiency and 83% total Kjeldahl nitrogen removal efficiency. This system was able to remove, efficiently, COD and nitrogen in an UASB reactor.

  13. Influência da glicose sobre o consumo de fenol por Aspergillus niger an 400 em reatores em batelada The influence of glucose on the phenol consumption by Aspergillus niger an 400 in batch reactors

    Directory of Open Access Journals (Sweden)

    Kelly de Araújo Rodrigues

    2007-06-01

    Full Text Available Aspergillus niger AN 400 foi inoculado em reatores em batelada para remoção de fenol de meio sintético, na presença e ausência de glicose. O experimento possuía: 5 reatores de controle (grupo 1 com meio contento apenas fenol; 5 reatores (grupo 2 inoculados com fungos e com meio com fenol e sem glicose; e 5 reatores (grupo 3 inoculados com fungos e com meio com fenol e glicose (5 g/L. Os reatores foram agitados a 200 rpm, a 30°C, durante 5 dias. A concentração média inicial de fenol foi de 323 mg/L e a de matéria orgânica, de 696 mg DQO/L, meio sem glicose, e 6058 mg DQO/L, meio com glicose. Os reatores do grupo 2 removeram 48% de fenol e 21% de DQO, enquanto que os reatores do grupo 3, 100% de fenol e 93% de matéria orgânica. Não houve redução significativa de fenol e de DQO nos reatores de controle. A assimilação foi a via principal de remoção de fenol.Batch reactors were inoculated with Aspergillus niger AN 400 to remove phenol from synthetic media with and without glucose. The experiment was set by: five blank reactors (group 1 with media containing only phenol; five reactors (group 2 inoculated with fungi and with media containing only phenol; and five reactors (group 3 inoculated with fungi and with media containing phenol and glucose (5 g/L. These reactors were kept at 30°C under stirring of 200 rpm during 5 days. The mean initial concentrations of phenol and COD were 323 mg/L and 696 mg COD/L for the media without glucose, and 6058 mg COD/L for the media containing glucose. The reactors of group 2 removed 48% of phenol and 21% of COD, while the reactors of group 3 removed 100% of phenol and 93% of COD. There was no significant reduction of phenol and COD in the blank reactors. The assimilation was the main pathway of phenol removal.

  14. Avaliação do uso da banda de rodagem de pneus inservíveis triturada como suporte ao desenvolvimento de biofilmes em um reator anaeróbio de leito expansível

    OpenAIRE

    Cristiano Luchesi Niciura

    2005-01-01

    A presente pesquisa teve como objetivo a avaliação do uso da banda de rodagem de pneus inservíveis triturada (BPIT) como suporte ao desenvolvimento de biofilmes em um reator anaeróbio de leito expansível (RALEx), em escala plena, com volume de 32m3, empregado no tratamento de esgoto sanitário. A utilização desse material como suporte apresentou-se como proposta inovadora, com grande potencial de aplicação. Para partida do sistema foram utilizados 6,0m3 de lodo proveniente do reator UASB da Es...

  15. Controle ótimo em reator batelada alimentada para a hidrólise enzimática da celobiose - DOI: 10.4025/actascitechnol.v25i1.2236

    Directory of Open Access Journals (Sweden)

    Fernanda de Castilhos Corazza

    2003-04-01

    Full Text Available A glicose pode ser obtida através da hidrólise enzimática pelas enzimas do complexo celulase. a hidrólise da celobiose pela celobiase exibe inibição pelo substrato e pelo produto, que reduzem a performance da reação. os trabalhos sobre esta hidrólise enzimática disponíveis na literatura foram conduzidos em reatores batelada, portanto um estudo sobre a possibilidade de utilização de outro tipo de reator ainda não foi realizado para esta hidrólise. o objetivo deste trabalho é analisar o uso de um reator batelada alimentada para esta reação enzimática. a política de alimentação foi determinada utilizando a teoria de controle ótimo, onde a conversão do substrato e a concentração do produto final foram maximizadas. os resultados simulados foram comparados com dados experimentais obtidos por calsavara et al. (1999 em um reator batelada e indicaram que a inibição pelo substrato se sobrepõe a inibição pelo produto. a operação em batelada alimentada mostrou-se vantajosa em algumas situações.

  16. Emprego de coagulante à base de tanino em sistema de pós-tratamento de efluente de reator UASB por flotação

    OpenAIRE

    Eloá Cristina Figueirinha Pelegrino

    2011-01-01

    O presente trabalho teve como objetivo principal a avaliação da eficiência de remoção de carga orgânica, fósforo e sólidos em suspensão de sistema de flotação tratando esgoto sanitário pré-tratado em reatores UASB, da ETE Monjolinho da cidade de São Carlos/SP, e coagulado com tanino associado ou não a polímeros sintéticos. Os ensaios com variação de dosagem de coagulante Tanino e polímeros (polímero catiônico, polímero não-iônico e polímero aniônico) foram realizados em escala de laboratório,...

  17. Desempenho de processo anaeróbio em dois estágios (reator compartimentado seguido de reator UASB para tratamento de águas residuárias de suinocultura Performance of two-stage anaerobic process (baffled reactor (ABR followed by an upflow sludge blanket reactor (UASB treating swine wastewater

    Directory of Open Access Journals (Sweden)

    Gracie F. R. Fernandes

    2006-04-01

    Full Text Available Avaliou-se o efeito das águas residuárias de suinocultura com concentrações de sólidos suspensos totais em torno de 6.000 mg L-1 (DQOtotal variando de 7.557 a 11.640 mg L-1 no desempenho de processo anaeróbio em dois estágios compostos por reator compartimentado (ABR e reator de fluxo ascendente com manta de lodo (UASB, instalados em série, em escala-piloto (volumes de 530 e 120 L, respectivamente, submetidos a tempos de detenção hidráulica (TDH de 56 a 18 h no primeiro reator e de 13 a 4 h no segundo reator. As eficiências médias de remoção de DQOtotal variaram de 71,1 a 87,5% no reator ABR e de 41,5 a 50,1% no reator UASB, resultando em valores médios de 86,8 a 94,9% para o sistema de tratamento anaeróbio em dois estágios com carga orgânica volumétrica (COV, na faixa de 5,05 a 10,12 kg DQOtotal (m³ d-1, no reator ABR, e de 2,83 a 9,63 kg DQOtotal (m³ d-1, no reator UASB. As eficiências de remoção de SST e SSV foram da ordem de 95,6%. O teor de metano no biogás manteve-se acima de 70% para os dois reatores. A produção volumétrica de metano máxima de 0,755 m³ CH4 (m³ d-1 ocorreu no reator 1, com COV de 10,12 kg DQOtotal (m³ d-1 e TDH de 18 h. Os valores médios de pH variaram na faixa de 7,2 a 8,0 para os efluentes dos reatores 1 e 2. Os ácidos voláteis totais mantiveram-se estáveis com concentrações abaixo de 200 mg L-1. Com variações abruptas e acentuadas de concentrações de SST e DQOtotal do afluente, os reatores mantiveram as eficiências de remoção de DQO e sólidos suspensos, em torno de 70%, e a qualidade do biogás, com 80% de CH4.In this work it was evaluated the effect of swine wastewater with total suspended solid (TSS concentration around 6000 mg L-1 (CODtotal from 7557 to 11640 mg L-1 on the performance of two stage anaerobic process constituted of anaerobic baffled reactors (ABR and an upflow sludge blanket reactor (UASB installed in series, in pilot scale testing (volumes of 530 L and

  18. SISTEMA COMBINADO DE FLOTAÇÃO POR AR DISSOLVIDO E FILTRAÇÃO ADSORTIVA EM ZEÓLITA PARA TRATAMENTO DE EFLUENTE DE REATOR UASB

    Directory of Open Access Journals (Sweden)

    Bruno Oliveira Freitas

    2016-06-01

    Full Text Available RESUMO: Dentre as soluções existentes para efetuar o tratamento de esgoto, o reator anaeróbio do tipo UASB é largamente utilizado no Brasil, porém esta tecnologia apresenta problemas em atender aos limites estabelecidos pela legislação brasileira para lançamento de efluente em termos de nitrogênio amoniacal, fósforo e matéria orgânica, necessitando de pós-tratamento. Diante do potencial para remoção de matéria orgânica e sólidos suspensos pela flotação e da eficiência que a zeólita apresenta na remoção de amônia, a floto-filtração-adsortiva em zeólita pode ser uma promissora alternativa para tratamento deste efluente. Sendo assim, o presente trabalho visou avaliar a eficiência de um sistema de flotação associado à filtração-adsortiva, utilizando zeólita como meio filtrante, para pós-tratamento de efluente de reator UASB. Para tal, foram realizados ensaios de coagulação/floculação, flotação e filtração-adsortiva com um floteste adaptado com filtros adsorventes, utilizando efluente de reator anaeróbio do tipo UASB. Os resultados obtidos neste estudo atenderam aos padrões estabelecidos pela legislação brasileira para lançamento de efluentes em corpos d’água, alcançando 100 % de remoção de nitrogênio amoniacal, permitindo que esse efluente possa ser aproveitado para reuso. Desse modo, o sistema de flotação com a filtração-adsortiva utilizando zeólita como meio filtrante mostrou-se eficiente na remoção de todos os poluentes avaliados. Esta pesquisa teve como principal contribuição a avaliação de alternativa promissora para pós-tratamento de efluente de reator UASB buscando atender as exigências da legislação brasileira e melhorar da qualidade dos efluentes sanitários. ABSTRACT: Among the existing solutions to sewage treatment, the UASB reactor is widely used in Brazil, but this technology has problem to attend the limits established by Brazilian law for discharging of effluent

  19. Remoção de BTEX por fungos em reator aeróbio de escoamento contínuo

    Directory of Open Access Journals (Sweden)

    Kelly Rodrigues

    2017-04-01

    Full Text Available RESUMO Foi estudada a remoção de compostos BTEX (benzeno, tolueno, etilbenzeno e xilenos em reator de escoamento contínuo e mistura perfeita, com inóculo de Aspergillus niger AN 400, operado sob o tempo de detenção hidráulica (TDH de 12 horas para avaliar a eficiência do sistema na biorremediação de água poluída com gasolina na presença (Etapa I e na ausência (Etapa II de glicose (0,5 g.L-1. A água poluída com gasolina foi preparada na proporção de 10:1000 mL (gasolina:água. Na primeira etapa foi ainda estudada a influência da adição de nutrientes no afluente sobre a eficiência do processo. A adição de nutrientes foi benéfica ao processo e, mesmo com a retirada da glicose, a eficiência foi mantida, devido à metabolização do etanol - presente na gasolina brasileira em 25% - pelos fungos, sendo ambos fontes de carbono de assimilação mais fácil para obtenção de energia; o etanol e a glicose, foram usados como cossubstratos na degradação dos BTEX. Assim, na Etapa 2, quando somente havia o etanol no meio, chegou-se a percentuais médios de 88% para benzeno, 90% para tolueno, 90% para etilbenzeno, e de 91% para meta, para e orto-xileno (m, p e o-xileno, com formação de subprodutos fenólicos. A população fúngica predominou no meio ao longo de toda a operação do reator.

  20. Avaliação microscópica da endogenia microbiana em reatores UASB concêntricos, tratando água residuária do processamento dos frutos do cafeeiro por via úmida - doi: 10.4025/actascitechnol.v33i2.8291

    Directory of Open Access Journals (Sweden)

    Júlia Ferreira da Silva

    2011-04-01

    Full Text Available Com a utilização de duas técnicas de microscopia, eletrônica de varredura (MEV e de epifluorescência, objetivou-se investigar o processo de endogenia da biomassa presente em reatores de manta de lodo e fluxo ascendente (UASB, do inglês upflow anaerobic sludge blancket. Dois reatores UASB concêntricos, funcionando em série, inseridos em um sistema-piloto de tratamento de águas residuárias do processamento dos frutos do cafeeiro por via úmida, foram monitorados quanto aos parâmetros físico-químicos e microbiológicos. Os reatores UASB operaram em campo, com oscilação de temperatura ambiente entre 16,5 e 38,8°C; as temperaturas do afluente e efluente dos reatores variaram de 16,3 a 27,3°C, respectivamente. Os dados iniciais obtidos para a demanda química de oxigênio (DQO foram de 1.349 e 1.173 mg L-1, sendo, ao final do monitoramento atingido os valores de 120 e 102 mg L-1 para os reatores 1 e 2, respectivamente. Concluiu-se que a microscopia aplicada ao perfil de sólidos dos reatores é muito importante e deve ser empregada como parâmetro de qualificação do lodo cultivado em reatores UASB, especialmente quando do decaimento bacteriano.

  1. Análise paramétrica de um reator anelar pulsado

    OpenAIRE

    Muniz da Silva, Helmut

    2006-01-01

    Um conceito de reator pulsado denominado VICHFPR (Very Intense Continuous Flux Pulsed Reactor) foi apresentado em 1997 como uma possível extensão do reator periodicamente pulsado russo IBR-2. O núcleo desse reator tem geometria anelar e é percorrido por um modulador de reatividade que é responsável pelo surgimento de um pulso rotativo no fluxo neutrônico no reator. Enquanto a maior parte do núcleo opera na subcriticalidade (kef1+β), gerando um fluxo máximo bem maior do que o fluxo médio....

  2. Degradação prematura da isolação papel-óleo em transformadores e reatores de potência devido a ação de enxofre corrosivo

    OpenAIRE

    Luiz Eduardo Friedenberg de Lemos

    2015-01-01

    A ação de compostos sulfúricos presentes no óleo isolante de transformadores e reatores de potência ajuda na sua estabilidade à oxidação, porém, com o passar do tempo, provoca a corrosão do cobre, o que leva o equipamento à falha. O teor de enxofre, presente no óleo bruto, foi então reduzido, porém aditivos colocados no óleo isolante para combater a oxidação, particularmente o dibenzil dissulfeto (DBDS), ocasionou falhas prematuras em vários transformadores e reatores no mundo todo. A reação ...

  3. First airborne transient em survey in antarctica

    DEFF Research Database (Denmark)

    Auken, Esben; Mikucki, J. J.; Sørensen, Kurt Ingvard K.I.

    2012-01-01

    A first airborne transient electromagnetic survey was flown in Antarctica in December 2011 with the SkyTEM system. This transient airborne EM system has been optimized in Denmark for almost ten years and was specially designed for ground water mapping. The SkyTEM tool is ideal for mapping...... conductive targets, and the transient AEM method provides a better understanding of the saline ground water system for microbiology, paleoclimate studies, or geothermal potential. In this study we present preliminary results from our field survey which resulted in more than 1000 km of flight lines...... are presented here, the Taylor Valley demonstrating the promising capabilities of the geophysical method to map permafrost and the saline ground water systems....

  4. Inativação térmica de ovos de helmintos em água e em biossólidos digeridos: cinética em reator batelada e modelagem matemática em reator tubular.

    OpenAIRE

    Marilza de Fátima Simoneti

    2006-01-01

    O biossólido pode ser um valioso recurso ao ser utilizado em solos agrícolas; porém, um dos principais problemas de sua utilização é a presença de patógenos que podem disseminar doenças. Os principais patógenos presentes no biossólido são vírus, bactérias, protozoários e helmintos. Dentre os patógenos existentes no biossólido, os ovos de helmintos são os mais resistentes à inativação térmica e, para helmintos, os ovos de Ascaris são utilizados como indicador desses parasitas devido à comum oc...

  5. Aplicação da via curta para remoção biológica de nitrogênio de lixiviado de aterro sanitário utilizando reator em batelada sequencial

    OpenAIRE

    Luiz Felipe Tavares De Santana

    2015-01-01

    A presente pesquisa teve o objetivo de estudar a remoção biológica de nitrogênio amoniacal (N-NH3) e matéria orgânica biodegradável presente em lixiviado de aterro sanitário, aplicando a nitrificação por meio da via curta, operando um reator de polietileno, em bateladas sequenciais, com volumes úteis superiores a 400 L, ou seja, em escala piloto, aerado por meio de compressor de 1 cv. O experimento foi realizado no aterro sanitário em operação há onze anos, localizado no município de Camaçari...

  6. Remoção de matéria orgânica, de nutrientes e de coliformes no processo anaeróbio em dois estágios (reator compartimentado seguido de reator UASB para o tratamento de águas residuárias de suinocultura Organic matter, nutrients and coliforms removal in two-stage anaerobic process (anaerobic baffled reactor followed by UASB reactor for swine wastewater treatment

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    Mário S. de Abreu Neto

    2009-03-01

    Full Text Available Neste trabalho, avaliou-se o efeito das águas residuárias de suinocultura, com concentrações médias de sólidos suspensos totais variando de 4.591 a 13.001 mg L-1, no desempenho de processo anaeróbio, em dois estágios, compostos por reator compartimentado (ABR e reator de fluxo ascendente com manta de lodo (UASB, instalados em série, em escala- -piloto (volumes de 530 e 120 L, respectivamente, submetidos a tempos de detenção hidráulica (TDH de 60; 36 e 24 h no primeiro reator, e de 13,6; 8,2 e 5,4 h no segundo reator. As eficiências médias de remoção de DQOtotal variaram de 69 a 84% no reator ABR e de 39 a 58% no reator UASB, resultando em valores médios de 87 a 94% para o sistema de tratamento anaeróbio em dois estágios, com carga orgânica volumétrica (COV na faixa de 11,5 a 18,0 g DQOtotal (L d-1 no reator ABR, e de 4,2 a 13,4 g DQOtotal (L d-1 no reator UASB. A produção volumétrica máxima de metano de 0,227 m³ CH4 (m³ reator d-1 ocorreu no reator UASB, com COV de 10,6 g DQOtotal (L d-1 e TDH de 5,4 h. As maiores eficiências de remoção de coliformes totais e termotolerantes (99,7%, DQOdiss (94%, SST (96%, NTK (71%, P-total (61% e outros nutrientes, no sistema de tratamento anaeróbio em dois estágios, foram obtidas com o TDH de 73,6 h e temperatura climatológica média de 24,6 °C, aplicando-se a menor COV (de 11,5 g DQOtotal (L d-1 no reator ABR, e de 4,2 g DQOtotal (L d-1 no reator UASB com a maior concentração de SST do afluente (13.001 mg L-1.In this work it was evaluated the effect of swine wastewater with mean total suspended solid (TSS concentration ranging from 4.591 to 13.001 mg L-1 on the performance of the anaerobic process in two stages composed of anaerobic baffled reactors (ABR and an upflow sludge blanket reactor (UASB, installed in series, in pilot scale testing (volumes of 530 and 120 L, respectively and with hydraulic detention times (HDT of 60; 36 and 24 h in the ABR reactor and 13.6; 8.2 and

  7. Tratamento de água com hidrocarbonetos aromáticos por uso de reator em bateladas sequenciais com inoculo fúngico Treatment of water with aromatic hydrocarbons by use of sequential batch reactor with fungi inoculum

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    Kelly Rodrigues

    2012-06-01

    Full Text Available Um reator em batelada, aerado, com biomassa imobilizada de Aspergillus niger AN400 foi operado durante 10 ciclos de 7 dias para remover benzeno (200 mg.L-1, tolueno (200 mg.L-1 e xileno (50 mg.L-1 - BTX - e de nutrientes de meio basal. O reator era alimentado semanalmente com 4 L do meio e glicose - 1 g.L-1, na Fase I, e 0,5 g.L-1, na Fase II. Os BTX foram detectados até o quarto dia de operação, em todos os ciclos. As melhores eficiências médias de remoção foram na Fase I: 75%de matéria orgânica solúvel, 80% de ortofosfato e 77% de amônia. O reator pode ser uma alternativa viável para tratamento de águas poluídas com BTX, porém há a necessidade de estudar o comportamento do reator durante período de operação mais longo e com ciclos reacionais mais curtos, bem como da identificação dos metabólitos produzidos.A batch reactor with air and immobilized biomass of Aspergillus niger AN400 was operated during 10 cycles of 7 days to remove benzene (200 mg.L-1, toluene (200 mg.L-1, and xylene (50 mg.L-1 - BTX - and nutrients from basal medium. The reactor was weekly fed with 4 L of the medium and glucose - 1 g.L-1 (Phase I and 0.5 g.L-1 (Phase II. The BTX had been detected until the fourth day of operation in all cycles. The best efficiencies of removal had been in Phase I: 75% of soluble organic matter, 80% of orthophosphate and 77% of ammonia. The reactor can be a viable alternative for the contaminated water treatment with BTX. However it has the necessity to study behavior of the reactor during longer period of operation and with shorter reaction cycles, as well as the identification of the produced metabolites.

  8. Aplicação da via curta para remoção biológica de nitrogênio de lixiviado de aterro sanitário utilizando reator em batelada sequencial

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    Luiz Felipe Tavares De Santana

    2015-12-01

    Full Text Available A presente pesquisa teve o objetivo de estudar a remoção biológica de nitrogênio amoniacal (N-NH3 e matéria orgânica biodegradável presente em lixiviado de aterro sanitário, aplicando a nitrificação por meio da via curta, operando um reator de polietileno, em bateladas sequenciais, com volumes úteis superiores a 400 L, ou seja, em escala piloto, aerado por meio de compressor de 1 cv. O experimento foi realizado no aterro sanitário em operação há onze anos, localizado no município de Camaçari - Bahia e operado pela empresa LIMPEC, responsável pelos serviços de coleta, transporte e destinação final dos resíduos sólidos urbanos e industriais não perigosos, gerados nos municípios de Camaçari e Dias D’Ávila, Bahia. O experimento foi conduzido durante 165 dias. Foram realizados: 7 (sete ciclos de tratamento utilizando razões de troca volumétrica de 10% e aerando o conteúdo do reator por 18 horas; 5 (cinco ciclos com razão de troca volumétrica de 20% e aerando o conteúdo do reator por 18 horas e, finalmente, 7 (sete ciclos com razão de troca volumétrica igual a 20% e aerando o conteúdo do reator por 24 horas. Todos os ciclos de tratamento foram operados com o conteúdo do reator a temperatura ambiente, sem correção de pH, e a concentração de oxigênio dissolvido (OD, durante a aeração, foi sempre inferior a 1,0 mg O2/L. Os melhores resultados de eficiência de remoção de poluentes de interesse foram obtidos quando o sistema foi operado com RTV iguais a 10 e 20% e tempos de aeração iguais a 18 e 24 horas respectivamente. Nessas condições operacionais, a remoção de N-NH3 variou entre 56 e 100%, correspondendo a concentrações efluentes entre 0,0 e 84,0 mg N-NH3/L, ou seja, durante 11 ciclos de tratamento o efluente atendeu à Resolução CONAMA 430/2011. O alcance do acúmulo de nitrito, avaliado por meio da razão nitrito/nitrogênio oxidado, mostrou-se estável durante todo o experimento. Ao longo

  9. Produção específica de biogás a partir de manipueira em reator de fase única Specific biogas production from manipueira at one-phase reactor

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    Osvaldo Kuczman

    2011-02-01

    Full Text Available O presente artigo mostra um estudo sobre a produção de biogás a partir de manipueira, considerando o volume de um reator de fluxo tubular horizontal de fase única. O objetivo do trabalho foi avaliar a produção de biogás aumentando-se as cargas orgânicas e os volumes de alimentação, o que resultou em redução do tempo de retenção hidráulica (TRH. O reator foi alimentado continuamente, com cargas orgânicas de 1,18; 1,28; 1,57 e 2,68 g DQO L-1rd-1 (gramas de demanda química de oxigênio por litro de reator por dia em TRHs de 15; 13,0; 8,3; 6,6 dias, respectivamente. As produções de biogás foram de 0,52; 0,41; 0,65 e 0,63 L L-1rd-1, destacando-se que o primeiro TRH avaliado foi o de 13 dias, seguido de 8,3; 6,6 e 15 dias. Do estudo, concluiu-se que, com a diminuição do TRH, ocorre maior produção de biogás por volume de reator. Consequentemente, através da utilização do TRH adequado, pode-se aproveitar melhor o volume do reator, fato que resultará em economia na implantação da tecnologia em indústrias processadoras de mandioca.This article presents a study on biogas production from wastewater cassava considering the volume of a one-phase horizontal tubular flow reactor. The objective was to evaluate the biogas production, enlarging the organic loadings and feeding volums, resulting in minor hydraulic retention times (HRT. The reactor was continuously fed with organic charges corresponding to 1.18; 1.28; 1.57 and 2.68 g COD L-1r d-1 (grams of oxygen chemical demand per liter of reactor per day, resulting in hydraulic retention times 15; 13; 8.3 and 6.6 days. The correspondent specific biogas productions were, respectively, 0.52; 0.41; 0.65 and 0.63 L L-1rd-1 , emphasizing that the 13-day was the first HRT rated, followed by 8.3, 6.6 and 15 days. It was concluded that with the HRT decrease occurred larger biogas production per reactor volume. Therefore, with the correct selection for HRT, it is possible to make the best

  10. Caracterização da casca de café (coffea arábica, L) in natura, e de seus produtos obtidos pelo processo de pirólise em reator mecanicamente agitado

    OpenAIRE

    João Paulo da Silva

    2012-01-01

    Resumo: O café é um importante produto na balança comercial brasileira e seu processamento gera a casca como um resíduo. O objetivo deste trabalho foi a caracterização física, termoquímica e fluidodinâmica da casca de café (coffea arábica, L) visando sua aplicação em processo de pirólise convencional em reator mecanicamente agitado e posterior caracterização das frações líquida e sólida geradas. O trabalho envolveu as seguintes etapas: (i) caracterização física e termoquímica da casca de café...

  11. Comparativo Do Potencial De Produção De Metano Utilizando Glicerol E Sacarose Como Substrato Orgânico, Em Reatores Operados De Forma Descontínua Alimentada

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    Indianara Cataneo

    2016-10-01

    Full Text Available A crise energética que vem preocupando, não só o Brasil, mas todo o mundo, traz a necessidade da busca por fontes energéticas alternativas, ou seja, energias que causem menos impacto ao meio ambiente. Outro problema enfrentado atualmente é a geração de resíduos e efluentes, que demandam tratamentos e controles adequados. A utilização de biogás como fonte renovável de energia vem se mostrando atrativa, considerando a utilização de resíduos e efluentes como substrato orgânico, com produção energética através de processos de digestão anaeróbia. O objetivo deste trabalho foi comparar o potencial de geração de biogás e metano gerado pelo glicerol, subproduto oriundo de indústrias de fabricação de biodiesel, e sacarose, caracterizada por possuir fácil degradabilidade. Foram testados sistemas de digestão anaeróbia de operação descontínua alimentada em reatores de bancada (19,2L de volume útil. Três situações foram avaliadas, 3, 6 e 9% de matéria orgânica em relação ao volume útil dos reatores. O tempo de detenção hidráulica foi de 15 dias para cada situação proposta. Finalizado os experimentos, verificou-se que o glicerol possui maior potencial para a geração de biogás e metano em relação à sacarose, nas concentrações de alimentação utilizadas.

  12. Tratamento anaeróbio de águas residuárias do beneficiamento de café por via úmida em reatores UASB em dois estágios Anaerobic treatment of wastewater from coffee pulping in upflow anaerobic sludge blanquet (UASB in two stages

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    Marcelo Bruno

    2008-06-01

    Full Text Available Neste trabalho, avaliou-se a eficiência do tratamento de águas residuárias do beneficiamento de café por via úmida em reatores anaeróbios de fluxo ascendente com manta de lodo (UASB, em dois estágios, em escala de bancada, submetidos a tempos de detenção hidráulica (TDH de 4,0; 5,2 e 6,2 dias e cargas orgânicas volumétricas (COV de 5,8; 3,0 e 3,6 g DQO total (L d-1, no primeiro reator (R1, e TDH de 2,0; 2,6 e 3,1 dias e COV de 5,8; 0,5 e 0,4 g DQO total (L d-1, no segundo reator (R2. Os valores médios de DQO do afluente variaram de 15.440 a 23.040 mg O2 L-1. As eficiências médias de remoção de DQO total e SST foram de 66 a 98% e de 93 a 97%, respectivamente, nos reatores UASB, em dois estágios. O teor médio de metano no biogás variou de 69 a 89%, no reator R1, e de 52 a 73%, no reator R2. A produção volumétrica máxima de metano de 0,708 L CH4 (L reator d-1 foi obtida com COV de 3,6 g DQO (Ld-1 e TDH de 6,2 d, no reator R1. Os valores médios de pH variaram de 4,7 a 7,7 e de 4,9 a 8,0 nos efluentes dos reatores R1 e R2, respectivamente. As concentrações de ácidos voláteis totais nos efluentes mantiveram-se estáveis com valores inferiores a 100 mg L-1, com TDH de 5,2 e 6,2 dias, no reator R1, e TDH de 2,6 e 3,1 dias, no reator R2. As concentrações médias de fenóis totais no afluente variaram de 80 a 97 mg L-1 e as eficiências médias de remoção nos reatores UASB, em dois estágios, foram de 72 a 90%.In this work, it was evaluated the efficiency of two stage up flow anaerobic sludge blanquet (UASB reactors, in bench scale, treating a liquid effluent from the coffee pulping, submitted to hydraulic detention time (HDT of 4.0; 5.2 and 6.2 days, resulting in organic loading rate (OLR of 5.8; 3.6 and 3.0 g COD (L d-1 in the first reactor (R1 and HDT of 2.0; 2.6 and 3.1 days with OLR of 5.8; 0.5 and 0.4 g DQO total (L d-1 in the second reactor (R2. The medium values of total COD affluent varied from 15,440 to 23,040 mg

  13. Efeito do retorno de lodo aeróbio sobre as características da biomassa presente em reatores UASB tratando esgoto sanitário Effect of aerobic sludge return on the characteristics of anaerobic biomass present in UASB reactors treating domestic sewage

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    Patrícia Procópio Pontes

    2009-06-01

    Full Text Available O presente trabalho buscou avaliar a influência do retorno do lodo produzido em filtros biológicos percoladores (FBP sobre as características da biomassa em reatores UASB utilizados para o tratamento de esgoto sanitário. Os experimentos foram conduzidos em reatores em escala piloto e em escala de demonstração, sendo que os reatores UASB foram operados com e sem retorno do lodo produzido nos FBP. Os resultados obtidos indicaram uma diminuição no diâmetro das partículas de lodo, durante as fases com retorno de lodo, mas apenas para as amostras de lodo tomadas nos pontos mais altos dos reatores anaeróbios. A estabilidade e a atividade metanogênica específica do lodo anaeróbio praticamente não se modificaram com o retorno de lodo. Conforme esperado, a produção específica de lodo anaeróbio aumentou com o retorno de lodo.This work aimed at evaluating the influence of the return of excess aerobic sludge produced in trickling filters (TF upon the biomass characteristics in UASB reactors used for the treatment of domestic sewage. The experiments were carried out in pilot and demonstration-scale reactors, with the UASB reactors being operated with and without the return of sludge produced in the TF. Smaller sludge particle sizes were observed when the aerobic sludge was returned to the UASB reactor, but only for sludge samples collected in the upper parts of the anaerobic reactors. Sludge stability and specific methanogenic activity were not affected by the return of sludge. As expected, the specific anaerobic sludge production increased with the return of sludge.

  14. Desempenho de um reator Fenton em escala industrial aplicado à remoção de fenóis em uma planta de recuperação de resíduos da indústria de papel e celulose

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    Everton Skoronski

    2015-11-01

    Full Text Available Este trabalho descreve o desempenho de um reator Fenton em grande escala usado para remoção de fenol em uma planta de valorização dos resíduos da indústria de papel e celulose. O efluente consiste em óleo vegetal e fenol. A estação de tratamento objetiva tratar 4 m3 h-1 e é constituída por um pré-tratamento para remoção de óleo, reator Fenton, Flotador de Ar Dissolvido - FAD e uma lagoa de aeração. Para a avaliação da estação de tratamento foram comparadas análises próprias do efluente com análises feitas em laboratório certificado. A eficiência global de remoção de fenol é maior do que 99,7%. Foi demonstrado que a combinação do processo de oxidação avançada com o biológico constitui-se em um sistema de tratamentos interessante a fim de remover contaminantes recalcitrantes.

  15. Controle de reatores de batelada exotermicos pelo metodo da linearização global

    OpenAIRE

    Luis Emilio Vasconcelos de Andrade

    1993-01-01

    Resumo: Os reatores em batelada representam um tipo de processo de grande importância na indústria química, visto que estão associados à produção de uma variada quantidade de produtos, tais como as especialidades químicas e fármacos o satisfatório controle deste processo, visando assegurar a qualidade do produto final, põe-se como uma questão bastante particular.Como muitas das reações promovidas em reatores em batelada envolvem 1iberação de calor, tem-se configurado, para efeito de controle,...

  16. Levantamento de parâmetros cinéticos medidos em reator anaeróbio de manta de lodo (UASB em escala-piloto tratando efluentes de laticínio = Survey of kinetic parameters measured in upflow anaerobic sludge blanket (UASB in pilot-scale treatment of dairy wastewater

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    Bruno Botelho Saléh

    2009-01-01

    Full Text Available O objeto desta pesquisa foi à obtenção e avaliação dos parâmetros cinéticos do reator anaeróbio de manta de lodo (UASB-Upflow Anaerobic Sludge Blanket na remoção da carga orgânica poluidora dos despejos da atividade laticinista. O sistema com suas principais unidades foi composto de tratamento preliminar (caixa de areia e flotadores,tanque de contato (TC, reator UASB, filtro anaeróbio (FAB e lodo ativo em batelada (LAB. Os TDH’s (tempos de detenção hidráulicos e a temperatura adotados para o reator UASB foram de 44, 35, 30, 26 e 20h após a fase de estabilização do sistema, com temperatura média de 24,8ºC ± 1,8ºC. O volume do reator era de 394 L. A partir dos dadosDQOT (mg L-1, Sólidos Totais Fixos e Voláteis (mg L-1, Temperatura (°C, Vazão (L dia-1 e Perfil de Lodo no reator (Sólidos Voláteis Totais em mg L-1, monitorados durante todo o período de pesquisa na estação-piloto, em cada um dos tempos de detenção hidráulicos(TDH’s no reator UASB, foi conduzido o estudo para obtenção dos parâmetros cinéticos: coeficiente de crescimento ‘Y’ (mg DQO mg SVT-1 d-1, coeficiente de decaimento ‘Kd’ (d-1, taxa máxima de crescimento ‘μmáx’ (d-1 e concentração de substrato limitante ‘Ks’ (mg DQO L-1. Os parâmetros cinéticos determinados se basearam em estudos de regressão linear para determinação de Y, Kd, μmáx e Ks, respectivamente, dando, assim, respaldo técnico-científicoaos dados físico-químicos levantados durante a operacionalização do sistema.The goal of this research was to obtain and withdraw the kinetic parameters from an Upflow Anaerobic Sludge Blanket – UASB in removing the organic load from the waste by-product of a dairy activity. The treatment system was composed of a Sand Interceptor (Grit Chamber, Grease Intercept Chambers, Stirred Contact Tank (CT, a UASB reactor, Anaerobic Filter (AF, and Batch Activated Sludge System (BASS. The HRT (Hydraulic Retention Time and

  17. Tratamento de efluentes de refinaria de petróleo em reatores com Aspergillus niger Treatment of petroleum refinery wastewater by reactors inoculated with Aspergillus niger

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    Sandra Tédde Santaella

    2009-03-01

    Full Text Available Neste trabalho, avaliou-se o efeito do tempo de detenção hidráulica (TDH no desempenho de três reatores aeróbios inoculados com Aspergillus niger AN400, usados para tratamento de efluentes de refinarias de petróleo. Cada reator foi operado com um tempo de detenção hidráulica diferente: 4, 8 e 12 horas, durante 152 dias. Eles possuíam leito fixo de espuma de poliuretano e o escoamento era ascendente e contínuo. Determinaram-se: pH, fenóis, demanda química de oxigênio (DQO, amônia, nitrito e nitrato, no afluente e efluentes dos reatores. O TDH de oito horas foi o melhor para remoção de DQOsolúvel e não houve diferença entre os TDHs para remoção de fenóis totais. No período estável não houve remoção de nitrato; no entanto ocorreu remoção de nitrito de aproximadamente 99%. Além disto, houve produção de amônia devido à amonificação a partir do nitrito presente no meio.This paper evaluated the effect of hydraulic retention time (HRT on the performance of three upflow aerobic reactors, with polyurethane foam as support material, inoculated with Aspergillus niger AN400, used for the treatment of petroleum refinery wastewater. Each reactor was operated with a different HRT: 4, 8 and 12 hours, during 152 days. The performance was evaluated based on pH; phenols; COD, nitrate and nitrite. The results show that for the COD removal, it is more reasonable to operate the reactor with HRT of eight hours. However, there was no difference among results of phenol removal efficiency of the different HRTs. During steady state condition, nitrite was removed in approximately 99%, but there was no reduction on the nitrate concentration. Ammonia was produced in all reactors, probably due to ammonification of nitrite.

  18. Desempenho de reatores anaeróbios de fluxo ascendente com manta de lodo em dois estágios tratando águas residuárias de suinocultura Performance of two-stage up flow anaerobic sludge blanket reactors treating swine wastewater

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    Adriana M. de Santana

    2005-12-01

    Full Text Available Avaliou-se o desempenho de dois reatores anaeróbios de fluxo ascendente com manta de lodo (UASB em escala-piloto com volumes de 908 L e 188 L, instalados em série, alimentados com águas residuárias de suinocultura com concentrações médias de sólidos suspensos totais (SST variando de 2.216 mg L-1 a 7.131 mg L-1 e submetidos a tempos de detenção hidráulica (TDH de 62,3 e 31,1 h, no primeiro reator, e de 12,9 e 6,5 h, no segundo reator. As eficiências médias de remoção de DQOtotal variaram de 74,0% a 89,6% no Reator 1 e de 34,3% a 45,1% no Reator 2, resultando em valores médios de 86,6% a 93,1% para o sistema de tratamento em dois estágios com carga orgânica volumétrica (COV na faixa de 3,40 a 14,44 kg DQOtotal m-3 reator d-1 no Reator 1. As concentrações de metano no biogás foram acima de 75% para o Reator 1 e de 80% para o Reator 2. Os valores médios de pH variaram na faixa de 6,9 a 8,2 para o efluente do Reator 1 e de 7,0 a 8,3 para o efluente do Reator 2. Os ácidos voláteis totais mantiveram-se estáveis com concentrações médias abaixo de 200 mg L-1. Esses resultados indicaram que as condições de carga orgânica, em termos de DQO e SSV, impostas ao sistema de tratamento anaeróbio em dois estágios, não foram limitantes para que houvesse o desenvolvimento de lodo com microbiota adaptada e com alta atividade, propiciando altas eficiências médias de remoção de matéria orgânica (86,6 a 93,1% para DQOtotal e 85,6 a 88,2% para SSV e taxas de produção de metano de 0,156 a 0,289 m³ CH4 kg-1 de DQO removida.The objective of this work was monitoring the performance of two up flow anaerobic sludge blanket reactors (UASB in a pilot-scale testing with volumes of 908 L and 188 L, installed in series, loaded with swine wastewater with total suspended solids (TSS ranging from 2216 to 7131 mg L-1, submitted to an hydraulic detention time (HDT of 62.3 and 31.1 h, in the first reactor, and 12.9 and 6.5 h, in the second

  19. Remoção de demanda química de oxigênio e nitrogênio total Kjeldahl de efluente de indústria de vegetais congelados por Reator em Batelada Sequencial

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    Thaís Luciana Betto

    2013-09-01

    Full Text Available O objetivo deste trabalho foi estudar o tratamento biológico de efluente de indústria de vegetais congelados em Reator em Batelada Sequencial (RBS, verificando o efeito da concentração de Sólidos Suspensos Voláteis (SSV, Demanda Química de Oxigênio inicial (DQOi e aeração na remoção biológica de carbono e nitrogênio, a fim de obter um efluente tratado que atenda aos padrões de lançamento recomendados pela legislação ambiental brasileira. Nesta pesquisa, o tratamento dos efluentes foi feito em um RBS, utilizando concentração de SSV variando entre 2000 mg.L-1 e 4000 mg.L-1, DQOi variando entre 300 mg.L-1 e 600 mg.L-1, e quantidade de aeração variando entre 3 L.min-1 e 6 L.min-1. Os resultados mostram que a maior eficiência de remoção para DQO foi de 88%, e para nitrogênio total Kjeldahl (NTK foi de 74,9%. As condições otimizadas para remoção de DQO e NTK do efluente estudado foram: DQO inicial de 600 mg.L-1, aeração de 4,5 L.min-1 e concentração de SSV de 2000 mg.L-1

  20. Tratamento de esgoto sanitário em reator híbrido em bateladas sequenciais: eficiência e estabilidade na remoção de matéria orgânica e nutrientes (N, P Sewage treatment in a sequencing batch hybrid reactor: efficiency and stability in organic matter and nutrient (N, P removal

    Directory of Open Access Journals (Sweden)

    Luiz Gonzaga Lamego Neto

    2011-12-01

    Full Text Available Este trabalho apresenta os resultados de estudo sobre o comportamento de um reator híbrido, operado em bateladas sequenciais, na remoção conjunta de matéria carbonácea, nitrogênio e fósforo de esgoto sanitário. Operado em ciclos de 8 horas de duração, o reator possuía em seu interior um suporte fixo com rede de nylon. Foram testadas cargas compreendidas entre 0,39 e 1,35 kgDQO.m-3.dia-1, 42 e 60 gN-NH4-.m-3.dia e 51 e 70 gP-PO4-.m-3.dia. O reator funcionou como um sistema estável e apresentou boas condições de depuração. A remoção da matéria carbonácea mostrou-se elevada, com eficiências médias de 92% de DBO5 e 80% de DQO. A remoção de nutrientes variou entre 59 e 71% para nitrogênio total e entre 45 e 67% para fósforo total. Tanto no lodo em suspensão, quanto no biofilme, foi observada a ocorrência de bactérias oxidadoras de amônio e micro-organismos responsáveis pela desnitrificação e remoção biológica de fósforo.This paper presents the results about the behavior of a sequencing batch hybrid reactor on combined removal of carbonaceous matter, nitrogen and phosphorus from sewage. Operated in 8-hour cycles, the reactor had a nylon net fixed inside. Loads between 0.39 and 1.35 kg COD.m-3.day-1, 42 and 60 gN-NH4-m-3.day-1 and 51 and 70 gP-PO4-m-3.day-1 were tested. The reactor operated as a stable system and showed good depuration conditions. The carbonaceous matter removal was high, with 92 and 80% efficiencies average to BOD5 and COD, respectively. The nutrients removal varied between 59 and 71% for total nitrogen and between 45 and 67% for total phosphorus. In both, sludge in suspension and the biofilm, occurrence of ammonium-oxidizing bacteria and microorganisms responsible for denitrification and biological phosphorus removal was observed.

  1. Remoção de sulfato de águas residuárias industriais em reator anaeróbio de leito fixo operado em bateladas sequenciais Sulfate removal from industrial wastewaters in fixed film anaerobic sequential batch reactor

    Directory of Open Access Journals (Sweden)

    Arnaldo Sarti

    2008-03-01

    Full Text Available Avaliou-se o potencial de uso reator anaeróbio operado em bateladas seqüenciais com biomassa imobilizada (ASBBR, em escala piloto, no tratamento de água residuária industrial contendo elevadas concentrações de sulfato. O ASBBR, com volume total de 1.2 m³, foi preenchido com carvão mineral como meio suporte para imobilização da biomassa (leito fixo. Foram aplicadas cargas de 0,15; 0,30; 0,65; 1,30 e 1,90 kg SO4-2/ciclo (ou batelada com duração de 48 h, correspondendo, respectivamente, às concentrações de sulfato no afluente de 0,25; 0,50; 1,0; 2,0 e 3,0 gSO4-2.l-1. Utilizou-se etanol como doador de elétrons para a redução do sulfato. O reator foi operado à temperatura ambiente (29±8ºC, tendo sido obtidas eficiências médias na redução de sulfato entre 88 e 92% em 92 ciclos (275 dias. Os resultados obtidos permitem concluir que o uso de reatores ASBBR constitui-se em alternativa eficiente para a remoção de sulfatos de águas residuárias com características semelhantes às utilizadas neste trabalho.The potential use of an anaerobic sequencing batch biofilm reactor (ASBBR in pilot-scale for the treatment of a sulfate-rich industrial wastewater was evaluated. The pilot 1.2 m³ ASBBR reactor was filled with mineral coal for biomass immobilization (fixed film. The sulfate loading rates applied were 0.15; 0.30; 0.65; 1.30 and 1.90 kg SO4-2/cycle (or batch. Each cycle lasted 48 h. The influent concentrations were, respectively, 0.25; 0.50; 1.0; 2.0 and 3.0 gSO4-2.l-1. Ethanol was used as electron donor for sulfate reduction. The reactor operated at ambient temperature (29±8ºC, and the mean efficiencies of sulfate removal were in the range 88 to 92% in the 92 run cycles. The total operating period comprised 275 days. Based on the results obtained in this research, it could be concluded that the ASBBR can be an efficient alternative for the removal of sulfate from other industrial wastewaters with similar characteristics.

  2. Modelagem e simulação de um reator trickle-bed para hidrogenação de propeno

    OpenAIRE

    Rodrigo Simion Hunger

    2002-01-01

    Neste trabalho foi modelado um reator catalítico heterogêneo, pressurizado, adiabático e provido de reciclo. O leito deste reator está dividido em duas partes, sendo que a primeira opera como um reator trickle-bed, enquanto a segunda opera como um reator de leito fixo, onde os regentes estão em fase líquida. Um Sistema de Hidrogenação de Propeno em operação no Pólo Petroquímico do Sul foi utilizado para fornecer os dados necessários à validação do modelo proposto. Neste sistema, a reação de h...

  3. Tratamento de resíduos sólidos de centrais de abastecimento e feiras livres em reator anaeróbio de batelada Treatment of solid waste from supply centers and free markets in batch anaerobic reactor

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    Valderi D. Leite

    2003-08-01

    Full Text Available Em feiras livres e centrais de abastecimento são produzidas quantidades bastante significativas de resíduos sólidos, com características favoráveis ao aproveitamento integral em processo de bioestabilização anaeróbia. O processo de bioestabilização é realizado em reatores anaeróbios de batelada (RAB, com tempo de detenção de sólidos variando de 250 a 300 dias originando, como produtos finais, o biogás, com cerca de 60% de gás metano, além de composto orgânico parcialmente bioestabilizado. Neste trabalho, foram utilizados resíduos sólidos orgânicos tipicamente vegetais, advindos de centrais de abastecimento, feiras livres e lodo de esgoto sanitário. O sistema experimental utilizado era constituído basicamente por um reator anaeróbio de batelada, com capacidade unitária de 2200 litros, além de outros dispositivos complementares. O sistema experimental foi instalado e monitorado na Estação Experimental de Tratamento Biológico de Esgoto Sanitário, situada no Bairro do Tambor, na cidade de Campina Grande, Estado da Paraíba, no período de janeiro a setembro de 2001. No processo de monitoração foram realizadas caracterizações sistemáticas das frações sólidas, líquidas e gasosas. Após análise dos dados, ficou evidenciada a viabilidade desta alternativa de tratamento, restando ser investigada ainda a viabilidade econômica, quando comparada com outras alternativas tecnológicas de tratamento de resíduos sólidos orgânicos.Significant quantity of organic solid waste with favorable characteristics for integral utilization in anaerobic biostabilization is produced in free markets and supply centers. The process is conducted in anaerobic batch reactors (ABR, with detention time of solids varying from 250 to 300 days, producing biogas with about 60% of methane, besides the partially biostabilized organic compost as the final product. In this study, the organic solid waste used was typically of vegetables

  4. Otimização da transição de grades poliméricos em reatores tipo loop para a produção de polipropileno.

    OpenAIRE

    Maria Giuliana Fontanelli Torraga

    2016-01-01

    As unidades industriais de produção de poliolefinas operam de maneira contínua, mas precisam produzir diferentes tipos de grades poliméricos (polímeros com diferentes especificações, para diferentes aplicações). As condições de operação do reator são mantidas por um certo período de tempo para produzir um determinado grade, e periodicamente as condições são alteradas para produzir lotes de outros grades. Estas transições permitem produzir diferentes grades usando o mesmo reator, mas exige mud...

  5. Tratamento anaeróbio de pentaclorofenol em reator de leito fluidificado alimentado com água residuária sintética contendo glicose como fonte única de carbono Anaerobic treatment of pentachlorophenol in a fluidized bed reactor fed with synthetic wastewater containing glucose as a single carbon source

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    Flavio Bentes Freire

    2008-09-01

    Full Text Available Neste trabalho foi utilizado um reator anaeróbio de leito fluidificado (RALF, tratando água residuária sintética contendo pentaclorofenol (PCP, submetido a condições operacionais menos idealizadas. Utilizou-se um reator com volume de 16 litros, com partículas de carvão ativado granular como meio suporte. O desempenho do reator foi verificado pelas análises usuais de monitoramento (pH, alcalinidade, DQO, ácidos voláteis e também por análises de microscopia e concentração de PCP. A presença de PCP no sistema, nas concentrações utilizadas, não alterou de maneira significativa a qualidade da biomassa presente, e nem os parâmetros de monitoramento. Em concentrações afluentes de PCP variando de 1 a 6 mg/L, foram observadas eficiências médias de remoção de 92% e 70%, respectivamente.In the present work, an anaerobic fluidized bed reactor (AFBR was used for the treatment of a synthetic wastewater containing pentachlorophenol (PCP subjected to less idealized operating conditions. The reactor was a 16 litres tank with granular activated carbon particles as support media. Evaluation of AFBR performance was done by the analysis of usual monitoring parameters (pH, alkalinity, COD, volatile acids together with microscopy and PCP concentration analysis. The presence of PCP under the concentrations used did not significantly alter the amount of biomass and the performance monitoring parameters. Removal average efficiencies of the order of 92% and 70% were obtained for PCP inflow concentrations in the range of 1 to 6mg/l.

  6. A neural networks based ``trip`` analysis system for PWR-type reactors; Um sistema de analise de ``trip`` em reatores PWR usando redes neuronais

    Energy Technology Data Exchange (ETDEWEB)

    Alves, Antonio Carlos Pinto Dias

    1993-12-31

    The analysis short after automatic shutdown (trip) of a PWR-type nuclear reactor takes a considerable amount of time, not only because of the great number of variables involved in transients, but also the various equipment that compose a reactor of this kind. On the other hand, the transients`inter-relationship, intended to the detection of the type of the accident is an arduous task, since some of these accidents (like loss of FEEDWATER and station BLACKOUT, for example), generate transients similar in behavior (as cold leg temperature and steam generators mixture levels, for example). Also, the sequence-of-events analysis is not always sufficient for correctly pin point the causes of the trip. (author) 11 refs., 39 figs.

  7. Avaliação de um reator de lodo ativado aplicado à nitrificação utilizando ensaios cinéticos - DOI: 10.4025/actascitechnol.v30i1.3201

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    Valéria Reginatto

    2008-05-01

    Full Text Available Neste trabalho, um reator em escala laboratorial de lodo ativado, aplicado ao processo da nitrificação, foi acompanhado por meio de ensaios cinéticos de atividade específica. A atividade de nitrificação da biomassa foi determinada por respirometria na caracterização do inóculo e na avaliação da biomassa do reator em duas condições: durante a alimentação do reator com meio sintético autotrófico; e após a sua alimentação com efluente de um reator UASB, utilizado para desnitrificação. O reator atingiu uma eficiência em torno de 90% de nitrificação em ambas as condições de operação. O modelo cinético de Andrews, que inclui uma constante da inibição pelo substrato (Ki, ajustou-se melhor aos resultados obtidos nos testes de atividade do que o de Monod. Entretanto, observou-se aumento da constante de inibição (Ki do lodo após operação do reator em relação ao inóculo, demonstrando a adaptação da biomassa às novas condições (cargas de nitrificação.

  8. "Desenvolvimento de um Simulador de Treinamento para Operadores do Reator de Pesquisa IEA-R1"

    OpenAIRE

    Ricardo Pinto de Carvalho

    2006-01-01

    Este trabalho apresenta o desenvolvimento de um Simulador do Reator de Pesquisa IEAR1. O Simulador foi desenvolvido com Visual C++ em duas etapas: 1) construção dos modelos matemáticos e 2) criação e configuração de interfaces gráficas em um aplicativo Windows XP. Utilizou-se uma modelagem simplificada dos principais fenômenos físicos: o nuclear através de cinética pontual, e o modelo de térmica e hidráulica através das leis de conservação de massa e energia no canal médio do reator. As equaç...

  9. Eficiência na remoção de NAT, DBO e DQO utilizando reator aeróbio de leito fluidizado com circulação em tubos concêntricos associado ao decantador de coluna em uma produção intensiva de tilápia

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    Tsunao Matsumoto

    Full Text Available RESUMO O desenvolvimento da aquicultura intensiva é acompanhado de um crescente impacto ambiental produzido pelos efluentes gerados. Os sistemas de recirculação para aquicultura (SRA são uma alternativa compacta e trabalham com elevadas densidades de estocagem e menores volumes de água. Foi utilizado um decantador de coluna (DC associado ao reator aeróbio de leito fluidizado com circulação em tubos concêntricos (BAS-CT com tempo de retenção hidráulica (TRH de 0,55 e 0,20 h respectivamente, num SRA com tilápias de 0,32 kg de peso médio e densidade de estocagem de 33,1 kg.m-3 em relação à remoção do nitrogênio amoniacal total (NAT, demanda bioquímica de oxigênio (DBO e demanda química de oxigênio (DQO. As eficiências na remoção de NAT, DBO e DQO foram 35,2, 48,0 e 64,9%, respectivamente. No uso de DC com o BAS-CT, obteve-se bom desempenho, com baixos TRH no tratamento do efluente.

  10. Tratamento de águas residuárias de suinocultura em reator UASB e filtro anaeróbio em série seguidos de filtro biológico percolador Treatment of swine wastewater in UASB reactor and anaerobic filter in series followed of trickling filter

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    Rose Maria Duda

    2011-03-01

    Full Text Available Avaliou-se o desempenho de um reator anaeróbio de fluxo ascendente com manta de lodo (UASB seguido de um filtro anaeróbio, instalados em série, com volume total de 300 L e 190 L, respectivamente, no tratamento de águas residuárias de suinocultura. As cargas orgânicas volumétricas aplicadas no reator UASB foram de 12,4;15,5; 23,2 e 26,3 g DQOtotal (L d-1. Para o pós-tratamento do efluente do sistema anaeróbio em dois estágios utilizou-se um filtro biológico percolador com volume total de 250 L. O meio suporte utilizado nos filtros anaeróbio e biológico percolador foi composto por anéis de bambu. No sistema de tratamento anaeróbio e de pós-tratamento foram observadas eficiências médias de remoção de demanda química de oxigênio total (DQOtotal, sólidos suspensos totais (SST, nitrogênio total (NT, fósforo total (P-total, Cu e Zn de até 98, 99, 78, 84, 99 e 98%, respectivamente.The performance of an upflow anaerobic sludge blanket (UASB followed by the anaerobic filter, installed in series, was evaluated for the treatment of swine wastewater. The total volume of UASB and anaerobic filter were of 300 L and 190 L, respectively. The organic load rate applied on the reactor UASB were of 12.4, 15.5, 23.2 and 26.3 g total COD (L d-1. For the post-treatment of effluent the anaerobic system was used a trickling filter with total volume of 250 L. The supports used in the anaerobic filter and trickling filter were composed by bamboo rings. The efficiencies of removal the chemical oxygen demand, total solids suspended, nitrogen, total phosphorus, Cu and Zn were of up to 98, 99, 78, 84, 99 and 98%, respectively, for the anaerobic and aerobic treatment system.

  11. Biodigestão anaeróbia de dejetos de caprinos e ovinos em reator contínuo de PVC flexível Anaerobic digestion of goat and sheep wastes in a continuous reactor of flexible PVC

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    Danilo G. de Quadros

    2010-03-01

    Full Text Available A escassez de fontes energéticas e as altas taxas de mortalidade do rebanho são dois grandes problemas para os agricultores familiares no semiárido brasileiro. De setembro de 2006 a abril de 2007 um reator contínuo com gasômetro em PVC flexível, com 33 m³ de volume, instalado na Estação Experimental da EBDA, Jaguarari, Estado da Bahia, foi monitorado quanto aos parâmetros bioquímicos, microbiológicos e parasitários do afluente e efluente, sendo avaliadas a produção e a composição do biogás, além da utilização do biofertilizante em capim-elefante. Com o manejo adequado, o poder poluente dos dejetos foi reduzido significativamente. Microbiologicamente, a eficiência de remoção de coliformes totais e fecais se manteve acima de 98% enquanto os ovos dos principais endoparasitos foram eliminados com o tratamento. A produção de biogás foi de 0,061 m³ kg-1 de esterco. Basicamente, o biogás apresentou, em sua composição, 58 e 34% de metano e gás carbônico, respectivamente. O biofertilizante (pH 7,5 foi uma boa fonte de nutrientes, sobretudo de nitrogênio (64 g 100L-1, 80% na forma amoniacal e potássio (214 g 100L-1, aumentando a produção de forragem sem alterações significativas na composição bromatológica, digestibilidade "in vitro" da matéria seca e teor de minerais.The scarcity of energy resources and the high livestock mortality rates are perpetual problems for small farmers of the Brazilian semi-arid region. From September 2006 to April 2007 a continuous reactor, of 33 m³ with gasometer in PVC flexible film, was installed at the EBDA Experimental Station, Jaguarari, Bahia State and the affluent and effluent biochemical, microbiological, and parasitological characteristics were monitored, the biogas production and composition being evaluated, as well as the use of the biofertilizer in elephant grass. With adequate management, the pollution power of residues reduced significantly. Microbiologically, the

  12. Performance of UASB reactors in two stages under different HRT and OLR treating residual waters of swine farming Desempenho de reatores UASB em dois estágios sob diferentes TDH e COV tratando águas residuárias de suinocultura

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    Estevão Urbinati

    2013-04-01

    Full Text Available In this study it was evaluated the effects of hydraulic retention time (HRT and Organic Loading Rate (OLR on the performance of UASB (Upflow Anaerobic Sludge Blanket reactors in two stages treating residual waters of swine farming. The system consisted of two UASB reactors in pilot scale, installed in series, with volumes of 908 and 188 L, for the first and second stages (R1 and R2, respectively. The HRT applied in the system of anaerobic treatment in two stages (R1 + R2 was of 19.3, 29.0 and 57.9 h. The OLR applied in the R1 ranged from 5.5 to 40.1 kg CODtotal (m³ d-1. The average removal efficiencies of chemical oxygen demand (COD and total suspended solids (TSS ranged, respectively, from 66.3 to 88.2% and 62.5 to 89.3% in the R1, and from 85.5 to 95.5% and 76.4 to 96.1% in the system (R1 + R2. The volumetric production of methane in the system (R1 + R2 ranged from 0.295 to 0.721 m³CH4 (m³ reactor d-1. It was found that the OLR applied were not limiting to obtain high efficiencies of CODtotal and TSS removal and methane production. The inclusion of the UASB reactor in the second stage contributed to increase the efficiencies of CODtotal and TSS removal, especially, when the treatment system was submitted to the lowest HRT and the highest OLR.Neste trabalho, avaliou-se o efeito do tempo de detenção hidráulica (TDH e da carga orgânica volumétrica (COV no desempenho de reatores UASB (Upflow Anaerobic Sludge Blanket, em dois estágios, tratando águas residuárias de suinocultura. O sistema foi constituído por dois reatores UASB em escala-piloto, instalados em série, com volumes de 908 e 188 L, para o primeiro e segundo estágios (R1 e R2, respectivamente. Os TDH, aplicados no sistema de tratamento anaeróbio, em dois estágios (R1 + R2, foram de 19,3; 29,0 e 57,9 h. As COVs aplicadas no R1 variaram de 5,5 a 40,1 kg DQOtotal (m³ d-1. As eficiências médias de remoção de demanda química de oxigênio total (DQOtotal e s

  13. Sistema integrado de tratamento de efluentes sanitários com reatores anaeróbios sequenciais em batelada e wetlands construídos de fluxos alternados

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    Gustavo Stolzenberg Colares

    2018-01-01

    Full Text Available A concepção de um sistema integrado de wetlands construídos (WCs, de diferentes configurações, foi desenvolvida neste trabalho visando melhorias para remoção de nitrogênio e fósforo de efluentes de águas negras e amarelas, bem como da não utilização de suporte fixo para plantio das mudas de Hymenachne grumosa em parte do sistema. Canos de PVC foram utilizados em parte para montagem do sistema nas unidades de wetlands construídos flutuantes de fluxo horizontal + flutuantes de fluxo alternado + de fluxo vertical. No último estágio foram aplicadas britas de números 1 e 2 para o sistema suporte. Os estudos foram feitos no campus da Universidade de Santa Cruz do Sul - UNISC, RS. As taxas de aplicação de Carbono Orgânico Total (COT, nitrogênio amoniacal e fósforo solúvel foram controladas para não ultrapassar respectivamente os limites de 26, 1,2 e 0,2 g m-1 dia-1 nos três sistemas integrados, considerando tempo de detenção de 7 dias para cada compartimento. As disposições das macrófitas foram de 24 até 32 mudas m-2, sendo que lentilhas (Lemna sp. e alfaces d’água (Pistia stratiotes foram utilizadas para controle de espaços em aberto na superfície do líquido nas configurações flutuante de fluxo horizontal (WCFFH e flutuante de fluxo horizontal alternado (WCFFA. Os resultados revelaram faixas de reduções da carga poluente após os WCs de 50-72% para o COT; de 77,7-93,7% para N-NH3 e de 88,8-94,7% para fósforo solúvel. O desenvolvimento do sistema radicular das macrófitas dos sistemas flutuantes ainda não atingiu a potencial plenitude de até 40 cm, sendo, portanto, possíveis melhores resultados com o decorrer dos estudos.

  14. Thermo-fluid analysis of water cooled research reactors in natural convection; Analise termofluidodinamica de reatores nucleares de pesquisa refrigerados a agua em regime de conveccao natural

    Energy Technology Data Exchange (ETDEWEB)

    Veloso, Maria Auxiliadora Fortini

    2004-07-01

    The STHIRP-1 computer program, which fundamentals are described in this work, uses the principles of the subchannels analysis and has the capacity to simulate, under steady state and transient conditions, the thermal and hydraulic phenomena which occur inside the core of a water-refrigerated research reactor under a natural convection regime. The models and empirical correlations necessary to describe the flow phenomena which can not be described by theoretical relations were selected according to the characteristics of the reactor operation. Although the primary objective is the calculation of research reactors, the formulation used to describe the fluid flow and the thermal conduction in the heater elements is sufficiently generalized to extend the use of the program for applications in power reactors and other thermal systems with the same features represented by the program formulations. To demonstrate the analytical capacity of STHIRP-l, there were made comparisons between the results calculated and measured in the research reactor TRIGA IPR-R1 of CDTN/CNEN. The comparisons indicate that the program reproduces the experimental data with good precision. Nevertheless, in the future there must be used more consistent experimental data to corroborate the validation of the program. (author)

  15. Avaliação do desempenho do reator anaeróbio de manta de lodo (uasb em escala laboratorial na remoção da carga orgânica de águas residuárias da suinocultura Performance evaluation of a lab-scale upflow anaerobic sludge blanket reactor (UASB removing organic loading rate from swine manure

    Directory of Open Access Journals (Sweden)

    Cláudio Milton Montenegro Campos

    2005-04-01

    Full Text Available Objetivou-se com o presente trabalho avaliar o desempenho do reator anaeróbio de manta de lodo (UASB-Upflow Anaerobic Sludge Blanket construído em escala laboratorial na redução da carga orgânica poluidora dos despejos suinícolas brutos. O sistema completo foi composto de um tanque de acidificação e equalização, reator UASB e lagoa aerada facultativa. O tempo de detenção hidráulica (TDH e temperatura adotada para o reator UASB foram de 30 horas e 30 ºC, respectivamente. Os valores médios afluentes de DQO T, ST e SVT foram de 1806, 1810 e 1240 mg.L-1. As eficiências de remoção de DQO T, ST e SVT foram de 84, 58 e 73%, respectivamente. O sistema se apresentou-se estável, com boas condições de tamponamento, retenção e digestibilidade de sólidos, demonstrando que os critérios adotados foram adequados, principalmente aqueles referentes ao TDH, carga orgânica volumétrica (COV e temperatura.The present work was carried out in order to evaluate the performance of a lab scale Upflow Anaerobic Sludge Blanket reactor (UASB treating liquid effluent from swine manure without solids separation. The treatment system consisted of one acidification tank, which also equalized the substrate, an UASB reactor, and an aerated facultative pound. The hydraulic retention time (HRT and temperature adopted for the UASB reactor were 30h and 30ºC, respectively. The influent average values of Chemical Oxygen Demand (COD, Total Solids (TS and Total Volatile Solids (TVS were 1806, 1810 and 1240 mg.L-1. The removal efficiencies were 84, 58 and 73 %, respectively. The system presented good stability and buffering conditions, and also a good solids digestibility, showing that the research criteria adopted was adequate, mainly those parameters referred to the HRT, Volumetric Organic Loading Rate (VOLR and temperature.

  16. Remoção de macronutrientes de efluente da indústria de castanha de caju por uso de reator aeróbio em batelada com inóculo fúngico Removal of macronutrients from effluent of a cashew nut industry by using a batch aerobic reactor with fungal inoculums

    Directory of Open Access Journals (Sweden)

    Marina Santos da Silva Lopes

    2011-03-01

    Full Text Available Foi estudada a eficiência da remoção de nitrogênio e fósforo do efluente de indústria de castanha de caju, por uso de reator aeróbio em batelada com inóculo de Aspergillus niger AN400. O reator recebeu 5 L de água residuária, acrescida de glicose, na concentração de 1 g.L-1 (Etapa I e de 5 g.L-1 (Etapa II . Cada etapa teve seis ciclos operacionais, cada um com tempo de reação total de sete dias. Os valores de pH dos efluentes na Etapa I variaram de 6,4 a 8,7 e na Etapa II , de 3,1 a 7,0. Durante a Etapa II , o reator alcançou bons resultados para remoção de nutrientes sem acúmulo de sua concentração no meio: 49% de fósforo total, 60% de ortofosfato, 79% de amônia, 78% de nitrato e 90% de nitrito, indicando que a menor liberação de nutrientes pelos micro-organismos ocorreu na presença de concentração elevada de glicose.It was studied the removal efficiency of nitrogen and phosphorus from effluent of a cashew nut industry by using an aerobic reactor operated in repetitive batch, inoculated with Aspergillus niger AN400. The reactor was fed with 5 L of wastewater, supplemented with glucose in the concentration of 1 g.L-1 (Phase I and 5 g.L-1 (Phase II . Each phase had six operational cycles, with total reaction time of seven days per cycle. The pH values of the effluents in Phase I varied from 6.4 to 8.7 and in Phase II , it varied from 3.1 to 7.0. The reactor achieved good results of removal without nutrients accumulated in the medium, during Phase II : 49% to total phosphorus, 60% to orthophosphate, 79% to ammonia, 78% to nitrate, and 90% to nitrite, indicating that the lesser release of nutrients by microorganisms occurred in the presence of higher glucose concentration.

  17. Remoção biológica de fósforo em reatores em bateladas sequenciais com diferentes tempos de retenção de sólidos Biological phosphorus removal in sequencing batch reactors with different solid retention times

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    Israel Nunes Henrique

    2010-06-01

    Full Text Available Nos últimos anos, tem surgido a necessidade de se projetarem sistemas de tratamento de águas residuárias que, além de remover carga orgânica, sejam capazes de remover nutrientes, particularmente nitrogênio e fósforo. Este trabalho avaliou a remoção biológica de fósforo em sistemas de lodo ativado, tratando esgoto doméstico por meio de reatores em bateladas sequenciais (RBS, monitorado com diferentes tempos de retenção celular (TRC: 20, 5 e 3 dias. Esses experimentos foram avaliados em escala de bancada com o uso da respirometria, utilizando-se acetato como fonte de carbono orgânico. Os resultados mostraram satisfatória remoção de fósforo total nos três experimentos, com valores médios entre 79 a 82%, sendo que o sistema RBS que operou com TRC de cinco dias obteve resultados melhores.In recent years, there has been an increasing need to design wastewater treatment systems that are capable of removing both organic material and nutrients, notably nitrogen and phosphorus. This study evaluated biological phosphorus removal by activated sludge systems fed with domestic sewage and operating as sequencing batch reactors (SBR with different solids retention times (SRT namely 20, 5 and 3 days. This was supported by respirometry experiments at bench scale using acetate as the source of organic carbon. The results showed satisfactory total phosphorus removal efficiencies mean values between 79-82% for the three regimes with the best removal efficiency occurring in the SBR operating with a five-day SRT.

  18. Produção de biogás no tratamento dos efluentes líquidos do processamento de Coffea arabica L. em reator anaeróbico UASB para o potencial aproveitamento na secagem do café Biogas production in the treatment of Coffea arabica L. processing wastewaters in UASB anaerobic reactor for the potential use in the coffee drying

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    Marco Antônio Calil Prado

    2008-06-01

    Full Text Available Estudou-se a produção de biogás proveniente do tratamento das águas residuárias do processamento por via úmida do café (ARC coco em sistema de tratamento anaeróbio em escala laboratorial. O sistema foi composto de um tanque de acidificação e equalização (TAE, um reator anaeróbio de manta de lodo e fluxo ascendente (UASB, uma lagoa aerada facultativa (LAF, um equalizador de pressão e um gasômetro. O tratamento foi realizado durante 190 dias e o pH foi controlado por certos períodos de tempo, pela adição de NaOH no TAE ou no reator UASB. No reator UASB, os valores máximos e mínimos obtidos na entrada foram de 235 a 7.064 mg.L-1 para DQO; 200 a 3.913 mg.L-1 para DBO5, 500 a 11.153 mg.L-1 para STV e 4,57 a 7,75 para o pH. Na saída do reator UASB, os valores foram de 39 a 2.333 mg.L-1 para DQO; 15 a 1.300 mg.L-1 para DBO5, 272 a 2.749 mg.L-1 para STV e 6,16 a 7,93 para o pH. Os valores mínimos e máximos de vazão afluente foram de 0,18 a 1,56 L.h-1. O biogás apresentou uma produção teórica de 0,545 a de 0,602 m³.kg-1DBO5 e porcentagem de metano de 48,60 a 68,14%.It was studied the biogas production through the treatment of the wet processing coffee wastewaters (ARC in an anaerobic treatment system in laboratorial scale. The system used was composed by one acidification and equalization tank (TAE, one anaerobic upflow sludge blanket reactor (UASB, one facultative aerated pond, one equalization tank and one gas tank. The treatment was carried out for 190 days and the pH was controlled for some periods by adding NaOH inside of the TAE or in the UASB. In the UASB reactor the maximum and minimum values obtained in the inlet were 235 to 7064 mg.L-1 for COD; 200 to 3913 mg.L-1 for BOD5, 500 to 11.153 mg.L-1 for TVS and 4,57 to 7,75 for pH. In the outlet of the UASB, the values were 39 to 2333 mg.L-1 for COD; 15 to 1300 mg.L-1 for BOD5, 272 to 2749 mg.L-1 for TVS and 6,16 to 7,93 for pH. The minimum and maximum values of the inlet

  19. Remoção de etanol e benzeno em reator anaeróbio horizontal de leito fixo na presença de sulfato Ethanol and benzene removal in a horizontal-flow anaerobic immobilized biomass reactor in the presence of sulfate

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    Eduardo Bosco Mattos Cattony

    2007-06-01

    Full Text Available Reator anaeróbio horizontal de leito fixo (RAHLF, preenchido com espumas de poliuretano, foi usado para tratar benzeno em solução etanólica, sob condições sulfetogênicas. Benzeno foi adicionado em concentração inicial de 2,0 mg.l-1, seguido de aumentos que variaram até 10 mg.l-1. O etanol foi adicionado em concentrações de 170 mg.l-1 a 980 mg.l-1. Soluções de sulfato ferroso e sulfato de sódio foram usadas, nas concentrações de 91 e 550 mg.l-1, respectivamente. O reator foi operado a 30 (± 2 ºC com tempo de detenção hidráulica de 12 h. A remoção da matéria orgânica foi próxima a 90% com taxa máxima de degradação de benzeno de 0,07 mg benzeno.mg-1SSV.d-1. O presente trabalho corrobora os dados obtidos por Cattony et al (2005, na medida em que torna mais consistente a proposta do uso de unidades compactas de RAHLF, para a biorremediação in situ de compostos aromáticos.In this study it is reported the operation of a horizontal-flow anaerobic immobilized biomass (HAIB reactor under sulfate-reducing condition which was also exposed to different amounts of ethanol and benzene. The HAIB reactor comprised of an immobilized biomass on polyurethane foam and ferrous and sodium sulfate solutions were used (91 and 550 mg.l-1, respectively, to promote a sulfate-reducing environment. Benzene was added at an initial concentration of 2.0 mg.l-1 followed by an increased to 9 e 10 mg.l-1, respectively. Ethanol was added at an initial concentration of 170 mg.l-1 followed by an increased range of 960 mg.l-1. The reactor was operated at 30 (± 2 ºC with hydraulic detention time of 12 h. Organic matter removal efficiency of 90% with a maximum benzene degradation rate of 0.07 mg benzene.mg-1VSS.d-1. Thus, this work corroborate the data obtained for Cattony et al (2005 and also demonstrate that compact units of HAIB reactors, under sulfate reducing conditions, are a potential alternative for in situ aromatic compounds bioremediation.

  20. Eficiência do reator seqüencial em batelada (RSB na remoção de nitrogênio no tratamento de esgoto doméstico com DQO baixa The sequencing batch reactor (SBR efficiency in the removal of nitrogen on the treatment of domestic sewage with low COD

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    Luiz Fernando de Abreu Cybis

    2004-09-01

    Full Text Available Este trabalho tem como objetivo avaliar a eficiência e a estabilidade do RSB na remoção de nitrogênio no tratamento de esgoto doméstico com DQO baixa. O reator utilizado no experimento possui volume de trabalho de 600 L e trata 1200 L/d de esgoto bruto em três bateladas de oito horas. A partir dos dados obtidos na pesquisa, observou-se que o reator seqüencial em batelada possibilitou a remoção média de nitrogênio total igual a 88 % no tratamento de esgoto doméstico com DQO média de 257 mg/L. A remoção de DQO foi de 90 %, a média da alcalinidade total no efluente foi 72 mgCaCO3/L e o índice volumétrico de lodo médio ficou em 86 mL/g. Estes resultados indicam que é possível utilizar RSB para o tratamento de esgoto doméstico com matéria orgânica reduzida sem comprometer a qualidade do efluente, a remoção de nitrogênio e a estabilidade operacional do sistema.This work had the objective of evaluating the SBR efficiency and stability in the removal of nitrogen on the treatment of domestic sewage with low COD. The reactor used in the experiment has a working volume of 600 L, and treats 1200 L/d of raw sewage in three 8-hour cycles. From the data gathered during the research, it was realized that the SBR fostered an average removal of total nitrogen equal to 88% in the treatment of a domestic sewage with an average COD of 257 mg/L. The COD removal was 90%, the final effluent total alkalinity was 72 mgCaCO3/L, and the sludge volumetric index was 86 mL/g. The results indicate that is possible to use SBR for the treatment of domestic sewage with low organic matter without compromising the final effluent quality, the nitrogen removal ability, and the stability of the system.

  1. Tratamento de efluentes de abatedouro de frangos por meio de reator UASB seguido de filtro anaeróbio

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    L.S. Rodrigues

    2016-02-01

    Full Text Available O Brasil é um dos maiores produtores de aves do mundo e se destaca na exportação de carne de frango, que tem papel relevante na economia do país. Como resultado do crescimento da indústria de processamento do frango, há também um significativo aumento na geração de efluentes. Uma alternativa interessante para o tratamento desses resíduos são os reatores anaeróbios. Este trabalho teve como objetivo avaliar o desempenho do sistema reator UASB-Filtro anaeróbio no tratamento de efluentes de abate de frangos. O estudo foi desenvolvido em um abatedouro avícola, situado na região metropolitana de Belo Horizonte, Minas Gerais. O sistema de tratamento foi composto por peneira estática, caixa de gordura, reator UASB e filtro anaeróbio. A vazão média diária de efluentes do abatedouro foi de 30m³/dia. A carga orgânica aplicada no reator UASB foi de 0,71kg DQO/m³.d. O monitoramento do sistema foi realizado por meio de análises físico-químicas do afluente e dos efluentes da caixa de gordura, reator UASB e filtro anaeróbio. Os parâmetros avaliados foram: temperatura, pH, demanda química de oxigênio (DQO, demanda bioquímica de oxigênio (DBO, sólidos suspensos totais (SST, e sólidos suspensos voláteis (SSV. Os valores efluentes médios encontrados para DBO, DQO e SST foram 106, 290 e 56mg/L, respectivamente. A eficiência de remoção do sistema para DBO variou de 83 a 99%, e para DQO de 50 a 98%. A eficiência de remoção média de SST e SSV foi de 92%. Conclui-se que o sistema reator UASB seguido de filtro anaeróbio apresentou alto desempenho na remoção de sólidos e carga orgânica. Dessa forma, esses reatores tornam-se uma alternativa viável para o tratamento de águas residuárias de frigoríficos, já que oferecem bons resultados de remoção de poluentes.

  2. Tratamento térmico de lodo anaeróbio com utilização do biogás gerado em reatores UASB: avaliação da autossustentabilidade do sistema e do efeito sobre a higienização e a desidratação do lodo Thermal treatment of anaerobic sludge utilizing biogas produced in UASB reactors: evaluation of system self-sustainability and the effect on sludge hygienization and dehydration

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    Eduardo Sales Machado Borges

    2009-09-01

    Full Text Available O presente trabalho objetiva avaliar a eficiência do biogás gerado em reatores UASB como fonte de energia para higienização térmica do lodo excedente, atentando-se ainda para a autossustentabilidade do sistema e para a avaliação do desaguamento do lodo tratado termicamente. Foi desenvolvido em um aparato experimental em escala de demonstração constituído de reator UASB, reservatório de biogás, reator térmico e leitos de secagem. A autossustentabilidade foi verificada por meio de balanço térmico teórico e de testes experimentais de higienização térmica. Estes testes indicaram que o aproveitamento da energia térmica do biogás foi suficiente para aquecer o lodo em temperaturas de 55 a 65ºC, durante três a cinco horas, possibilitando a completa eliminação de ovos viáveis de helmintos. No entanto, o processo de desidratação se mostrou muito mais difícil para o lodo tratado termicamente.The objective of this research was to determine how effectively biogas produced in UASB reactors could be used as a source of heat for the thermal hygienization of excess anaerobic sludge, whether the system can operate on a self-sustained basis and how the dehydration of the thermally treated sludge behave. The experiments were conducted in a demonstration-scale setup comprising UASB reactor, biogas holder, thermal reactor and sludge drying beds. The self-sustainability of the system was evaluated by the systemâ€TMs theoretical thermal balance and by experimental hygienization tests. These tests indicated that the recovery of thermal energy from the biogas was sufficient to heat the sludge at temperatures in the range of 55 to 65ºC, for three to five hours, allowing the complete elimination of viable helminth eggs. However, the dehydration process showed to be much more difficult for the thermally treated sludge.

  3. Desenvolvimento e operação de reator anaeróbio de manta de lodo (UASB no tratamento dos efluentes da suinocultura em escala laboratorial Development and operation of an upflow anaerobic sludge blanket reactor (UASB treating liquid effluent from swine manure in laboratory scale

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    Cláudio Milton Montenegro Campos

    2006-02-01

    Full Text Available A atividade suinícola vem, desde meados da década de 70, sendo uma das mais poluidoras atividades agroindustriais no Estado de Minas Gerais. Sendo assim, objetivou-se desenvolver um Reator Anaeróbio de Manta de Lodo (UASB-Upflow Anaerobic Sludge Blanket visando tratar os dejetos produzidos com máxima eficiência dentro de um tempo e com custo reduzidos. Para tanto um experimento em escala laboratorial foi projetado e monitorado no Laboratório de Análise de Água do Departamento de Engenharia da Universidade Federal de Lavras (LAADEG, sendo composto por um Tanque de Acidificação e Equalização (TAE, um Reator Anaeróbio de Manta de Lodo e uma Lagoa Aerada Facultativa (LAF, o qual foi alimentado com fluxo contínuo. As análises físico-químicas realizadas foram: DQO, DBO5, Sólidos Totais (Fixos e Voláteis, Temperatura, pH, Nitrogênio, Fósforo, Acidez e Alcalinidade Total. O sistema proporcionou eficiência de remoção média de 93% de DQO, 84% de DBO5 e 85% de Sólidos Totais Voláteis, demonstrando adequada adaptação aos diversos tempos de detenção hidráulica adotados (55, 40, 30, 25, 18 e 15 horas. Os parâmetros adotados na partida do reator UASB foram: COV: 1,11kgDQO.m-3.d-1, COB: 0,019 kgDBO5.kgSVT-1.d-1 e TDH: 55h.The swine production, since 70th , is one of the most pollutant agro-industrial activities in the Minas Gerais State, Brazil. The objective of this research was to develop an Upflow Anaerobic Sludge Blanket Reactor (UASB, aiming at treating the effluent generated within a maximum efficiency and minimum time and cost. Therefore, a lab-scale reactor was built up and monitored in the laboratory of Engineering Department at the Federal University of Lavras (UFLA. The system consisted of an Acidification and Equalization Tank (AET, an Upflow Anaerobic Sludge Blanket reactor (UASB, and an Aerated Facultative Pond (AFP. The system was fed continuously. The physical-chemical analyses carried out were: COD, BOD5, Total

  4. Monitoramento de parâmetros físicos, químicos e biológicos em um reator anaeróbio híbrido (RAH em escala piloto, tratando água residuária do café produzido por via úmida Monitoring of physical, chemical, and biological parameters of a hibrid anaerobic reactor (HAR in pilot scale, treating wastewater from wet coffee production

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    Vivian Galdino da Silva

    2010-02-01

    Full Text Available Conduziu-se este trabalho, com o objetivo de fornecer informações a respeito da investigação experimental realizada na estação piloto no Núcleo de Estudos em Cafeicultura (NECAF/UFLA, para tratamento de água residuária do café (ARC especificamente, o monitoramento de um Reator Anaeróbio Híbrido (RAH, utilizando minifiltros preenchidos com dois tipos de meio suporte (argila expandida e seixo rolado. O RAH possuía fundo falso e foi utilizado como inóculo lodo anaeróbio de Upflow anaerobic sludge blanket reator (reator anaeróbio de manta de lodo - UASB (escala-plena, de esgoto doméstico. O sistema foi monitorado por meio de parâmetros operacionais e de análises químicas e físico-químicas. Foi constatado que a fase experimental em que se deu o experimento dificultou a eficiência do RAH por ter sido submetido a cargas inferiores às previstas, uma vez que o efluente passava por tratamento em outras unidades, minimizando assim, a concentração orgânica a ser tratada. O RAH apresentou concentrações afluentes médias de: 484; 168 e 92 mg DQOtot L-1 e concentrações efluentes médias de 344; 159 e 90 mg DQOtot L-1, para os tempos de detenção hidráulica (TDH de 28,5; 23,7 e 18,0 horas, respectivamente. O RAH apresentou equilíbrio com relação aos parâmetros medidos e boa estabilidade. O efluente analisado não apresentou riscos de salinidade, uma vez que a CE ficou na faixa, entre 0,70 e 3,0 dS m-1 e os SDT, entre 450 a 2000 mg L-1. Quanto à sodificação, a Razão de Adsorção de Sódio (RAS ficou entre 0 e 3 e a CE>0,7 dS m-1, podendo ser reutilizado para irrigação da maioria das culturas e solos.The purpose of this work is to supply information regarding to the experimental investigation carried out in a pilot scale system, located at Coffee Study Research Center (NECAF/UFLA. The research focused mainly on a Hybrid Anaerobic Reactor (HAR operating with mini-filters filled with two types of physical support

  5. Influência do tempo de detenção hidráulica em um sistema UASB seguido de um reator biológico com fungos para tratar efluentes de indústria de castanha de caju Influence of the time of detention hidraulic of a sistem UASB followed by a biological reactor with fungi to treat efluent of cashew nut industry

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    Emília Maria Alves Santos

    2006-03-01

    Full Text Available Nesta pesquisa, estudou-se a influência do tempo de detenção hidráulica (TDH em um sistema constituído de um reator anaeróbio tipo UASB seguido de um reator biológico com fungos (RBF para tratar efluente de uma indústria de beneficiamento de castanha de caju. O presente trabalho foi dividido em uma fase de fluxo descontínuo (batelada e uma fase de fluxo contínuo (UASB - RBF, que constituiu-se de sete etapas ( 8h e 2h, 8h e 1h, 4h e 8h, 4h e 6h, 4h e 4h, 4h e 2h e 4h e 1h, onde foi avaliada a influência do TDH na remoção de: DQO (Demanda Química de Oxigênio, amônia, nitrato e ortofosfato. Uma combinação que apresentou melhores resultados, foi a etapa de 4h (TDH do reator UASB e 2h (TDH do RBF, apresentando remoções de: 93,8% de DQO, 86,7% de nitrato, 38,3% de amônia e 16% de ortofosfato.In this research, it was studied the effect of hydraulic retention time (HRT in a system comprised of an Upflow Anaerobic Sludge Blanket (UASB reactor and a Biological Reactor with Fungi (BRF for treatment of the efluent of the industry of cashew nut improvement. The work was divided in two phases: batch reactors using shaking flasks and continuous-feed reactors (UASB-BRF. The UASB reactor was operated at HRT of 4 and 8 h, whereas the BRF was operated at HRT varying from 1 to 8 h. The performance of both reactors was evaluated based on the removal efficiency of chemical oxygen demand (COD, ammonium, nitrate, and orthophosfate. The results show that the best results were achieved when the UASB was operated at HRT of 4 h and the BRF was operated at HRT of 2 h, when the system removed 93,8% of the COD, 86,7% of the nitrate, 38,3% of the ammonium and 16% of the orthophosfate.

  6. Síntese de redes de reatores para condições isotérmicas - DOI: 10.4025/actascitechnol.v30i2.5494

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    Lincoln Kotsuka da Silva

    2008-10-01

    Full Text Available No presente trabalho apresenta-se um procedimento computacional para síntese de redes de reatores (SRR operando em condições isotérmicas. Uma superestrutura de rede de reatores formada por reatores ideais CSTR e PFR é proposta e o problema apresenta uma formulação de programação não linear (PNL. São consideradas reações complexas (série/paralelas. A função objetivo é baseada no rendimento ou na seletividade em relação ao produto desejado, sujeito a diferentes condições de operação. As restrições ao problema são provenientes dos balanços de massa e da configuração da superestrutura considerada. No procedimento computacional é proposto um Algoritmo Genético (AG para obtenção do arranjo ótimo de reatores com máximo rendimento ou seletividade com menor volume reacional. Os resultados obtidos são condizentes com os obtidos na literatura.

  7. Kinetic behavior of nitrification in the post-treatment of poultry wastewater in a sequential batch reactor Comportamento cinético da nitrificação em um reator em bateladas sequenciais usado no pós-tratamento de efluente avícola

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    Juliana B. R. Mees

    2011-10-01

    Full Text Available A sequential batch reactor with suspended biomass and useful volume of 5 L was used in the removal of nutrients and organic matter in workbench scale under optimal conditions obtained by central composite rotational design (CCRD, with cycle time (CT of 16 h (10.15 h, aerobic phase, and 4.35 h, anoxic phase and carbon: nitrogen ratio (COD/NO2--N+NO3--N equal to 6. Complete cycles (20, nitrification followed by denitrification, were evaluated to investigate the kinetic behavior of degradation of organic (COD and nitrogenated (NH4+-N, NO2--N and NO3--N matter present in the effluent from a bird slaughterhouse and industrial processing facility, as well as to evaluate the stability of the reactor using Shewhart control charts of individual measures. The results indicate means total inorganic nitrogen (NH4+-N+NO2- -N+NO3--N removal of 84.32±1.59% and organic matter (COD of 53.65±8.48% in the complete process (nitrification-denitrification with the process under statistical control. The nitrifying activity during the aerobic phase estimated from the determination of the kinetic parameters had mean K1 and K2 values of 0.00381±0.00043 min-1 and 0.00381±0.00043 min-1, respectively. The evaluation of the kinetic behavior of the conversion of nitrogen indicated a possible reduction of CT in the anoxic phase, since removals of NO2--N and NO3--N higher than 90% were obtained with only 1 h of denitrification.Um reator em bateladas sequenciais com biomassa em suspensão e volume útil de 5L, aplicado para remoção de nutrientes e matéria orgânica, foi operado em escala de bancada, nas condições ótimas obtidas a partir de um delineamento composto central rotacional (DCCR, tempo de ciclo (TC de 16 h (10h15 fase aeróbia e 4h35 fase anóxica e relação carbono:nitrogênio (DQO/N-NO2-+N-NO3- de 6. Avaliaram-se 20 ciclos completos, nitrificação seguida de desnitrificação, com o objetivo de efetuar o estudo do comportamento cinético de degrada

  8. Tratamento por coagulação-floculação de lixiviado bruto de aterro sanitário com e sem pré-tratamento biológico em reator sequencial em batelada

    OpenAIRE

    André Granzotto Gewehr

    2012-01-01

    A forma de tratamento e destinação final ainda mundialmente preponderante para os resíduos sólidos urbanos é o aterro sanitário, método que gera, além de uma massa sólida residual, parcialmente estabilizada, subprodutos finais líquidos e gasosos. O efluente líquido, conhecido como lixiviado, necessita tratamento específico, devido a sua elevada nocividade ao meio ambiente, em função, principalmente, de suas elevadas concentrações de nitrogênio amoniacal e de matéria orgânica, em elevado perce...

  9. Reator biológico com membrana (MBR) aplicado ao tratamento de esgotos gerados por unidades residenciais unifamiliares

    OpenAIRE

    Pereira, Anne Relvas

    2017-01-01

    A escolha da tecnologia apropriada para o tratamento de esgoto doméstico tem sido uma preocupação crescente devido ao interesse em proporcionar um efluente de melhor qualidade, tanto para manutenção da qualidade ambiental como para produzir água para reúso. O objetivo desta pesquisa foi o de avaliar a aplicabilidade do processo de Reator Biológico com Membrana (MBR) a sistemas provenientes de unidades residenciais unifamiliares de esgotos no Brasil e as condições em que esse processo seria re...

  10. PC-Reactor-core transient simulation code

    International Nuclear Information System (INIS)

    Nakata, H.

    1989-10-01

    PC-REATOR, a reactor core transient simulation code has been developed for the real-time operator training on a IBM-PC microcomputer. The program presents capabilities for on-line exchange of the operating parameters during the transient simulation, by friendly keyboard instructions. The model is based on the point-kinetics approximation, with 2 delayed neutron percursors and up to 11 decay power generating groups. (author) [pt

  11. Avaliação da utilização das cinzas da escuma gerada em Reator Anaeróbico de Manta de Lodo e Fluxo Ascendente como pigmento inorgânico de coloração alaranjada

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    Tanna Elyn Rodrigues Fiuza

    Full Text Available RESUMO A escuma é um resíduo gerado durante o tratamento anaeróbico de efluentes domésticos que necessita de periódica remoção para não comprometer a eficiência do processo. O presente trabalho teve por objetivo utilizar as cinzas da escuma gerada em Reator Anaeróbico de Manta de Lodo e Fluxo Ascendente (RALF como pigmentos inorgânicos. Amostras de escumas coletadas em diferentes meses foram submetidas a tratamento térmico a 900°C por 1h para remoção da matéria orgânica. As cinzas obtidas foram desaglomeradas em peneira e submetidas às análises química (Fluorescência de raios X - FRX, mineralógica (Difração de raios X - DRX, morfológica (Microscopia Eletrônica de Varredura por Efeito de Campo - FE-MEV e de coloração (espectroscopia de reflectância difusa na região do Ultravioleta-Visível - UV-Vis. As amostras apresentaram composição majoritária de elementos comuns no ambiente, sendo as fases principais identificadas o quartzo (dióxido de silício - SiO2, a anidrita (sulfato de cálcio - CaSO4 e a hematita (óxido de ferro - Fe2O3. A granulometria das amostras é adequada para a aplicação como pigmento cerâmico; a coloração obtida foi alaranjada intensa e boas propriedades foram identificadas, como boa opacidade, omitindo a coloração do suporte cerâmico, além de não existirem defeitos superficiais que indicassem matéria orgânica residual ou incompatibilidade com o esmalte utilizado. Sendo assim, as cinzas da escuma gerada em RALF apresentaram características interessantes para a aplicação como pigmentos cerâmicos.

  12. Acúmulo de ácidos graxos voláteis (AGVs em reatores anaeróbios sob estresse: causas e estratégias de controle Build up of volatile fatty acids (VFA in anaerobic reactors under stress conditions: causes and control strategies

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    Sérgio F. de Aquino

    2005-06-01

    Full Text Available Este artigo apresenta uma visão integrada das principais causas de acúmulo de ácidos graxos voláteis (AGVs em reatores anaeróbios. O acúmulo de acetato observado durante as condições de choque de carga e/ou estresse ocorre provavelmente devido às limitações cinéticas dos microrganismos metanogênicos, que é acentuada com a redução do pH. O acúmulo de acetato e hidrogênio na fase líquida pode, por sua vez, desencadear limitações termodinâmicas e conseqüente acúmulo de propionato e butirato. A manutenção de condições ideais de crescimento dos microrganismos metanogênicos é uma estratégia de controle para reduzir o acúmulo de acetato, embora não seja efetiva em reduzir a concentração de hidrogênio dissolvida ao ponto em que não haja limitação sintrófica. As estratégias para mitigação das limitações termodinâmicas poderiam envolver a regulação da concentração de acetato através do uso de resinas ou membranas, e a separação espacial de microrganismos através da granulação ou tratamento em duas fases.This paper presents an integrated approach of the main reasons for the accumulation of volatile fatty acids (VFAs in anaerobic reactors. The build up of acetate during shock loads and/or stress conditions is likely to occur due to kinetic limitations of methanogenic microrganisms, which is enhanced by pH reduction. Acumulation of acetate and hydrogen in the liquid phase will set the stage for the accumulation of other VFAs, such as propionate and butyrate, due to thermodynamic inhibition. By mantaining the ideal growth conditions for the methanogens it may be possible to reduce the acetate build up, although it may not be effective in reducing the concentration of dissolved hydrogen so that thermodynamic inhibition is avoided. The strategies to mitigate themodynamic inhibition could involve regulation of acetate by means of membrane or resins, and spacial separation of microrganisms by granulation or

  13. TRATAMIENTO DE AGUAS RESIDUALES MEDIANTE REACTORES ANAERÓBICOS DE PLACAS VERTICALES PARALELAS EN ACRÍLICO TRATAMENTO DE ÁGUAS RESIDUÁRIAS POR REATORES ANAERÓBIOS DE PLACAS VERTICAIS PARALELAS EM ACRÍLICO WASTEWATER TREATMENT BY ANAEROBIC REACTORS OF VERTICAL PARALLEL PLATES IN ACRYLIC

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    Guillermo Chaux F

    2011-12-01

    Full Text Available Algunos filtros anaeróbicos con lecho de piedra construidos en el departamento del Cauca (Colombia, están presentando problemas de colmatación. Si se reemplaza la piedra por placas verticales paralelas, se elimina el problema de obstrucción. Este documento presenta el desarrollo y resultados de una investigación que evaluó a escala de laboratorio el potencial de los reactores anaeróbicos de placas verticales paralelas en acrílico para remover contaminantes (materia orgánica y sólidos suspendidos. El reactor anaeróbico de placas paralelas en acrílico se desempeñó como tratamiento secundario; se alimentó con agua residual efluente de un Tanque Imhoff con concentraciones medias de 156 ± 14 mg/L de DB05, 438 ± 32 mg/L de DQO y 98 ±22 mg/L de sólidos suspendidos totales. Las remociones de DQO y DB05 en el reactor sobrepasan el 50% y la remoción de sólidos suspendidos sobrepasó el 60% para tiempos de detención de 24 horas. La facilidad en la operación del reactor lo hace viable como tratamiento biológico anaeróbico de aguas residuales previamente decantadasAlguns filtros anaeróbios com recheio de pedras construída no departamento de Cauca (Colombia estão apresentando problemas de obstrução. Se a pedra é substituída por placas verticais paralelas, evita o problema da obstrução. Este artigo apresenta o desenvolvimento e os resultados e no estudo realizado em escala de laboratório que avaliaram o potencial de reatores anaeróbios de placas verticais paralelas em acrílico para remover os contaminantes (sólidos suspensos e matéria orgânica. 0 reator anaeróbio de placas paralelas de acrílico serviu como tratamento secundário; foi alimentado com água residuária do efluente de um tanque Imhoff com concentrações médias de 156 ± 14 mg/L DB05, 438 ± 32 mg/L de DQO e 98 ±22 mg/L de sólidos suspensos totais. A remoção de DQO e DB05 no reator são mais de 50% ea remoção de sólidos em suspensão superior a 60

  14. Síntese do cerato de bário pelo método de complexação combinando EDTA-citrato e avaliação catalítica na oxidação do monóxido de carbono testada em reator de leito fixo

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    M. F. Lobato

    Full Text Available Resumo A perovskita de cerato de bário foi sintetizada com base no método de complexação combinando EDTA-citrato e suas propriedades catalíticas testadas na reação de oxidação do monóxido de carbono em um reator de leito fixo variando a vazão de alimentação (50 e 100 mL.min-1 e a temperatura (100 a 550 °C. A fase cristalina de interesse foi obtida com tamanho de cristalito de 133 nm, junto com uma pequena quantidade de BaCO3 (3%. Quando sintetizado pelo método de complexação combinando EDTA-citrato, o cerato de bário apresenta um formato esférico irregular com aglomerados de diferentes tamanhos e com a presença de poros de diferentes tamanhos distribuídos aleatoriamente, sendo sua área superficial específica igual a 2,61 m2.g-1. Na vazão de 50 mL.min-1 ocorreu maior conversão quando comparado com a de 100 mL.min-1, sendo mais evidente entre 300 e 400 °C. Além disso, na vazão de 50 mL.min-1 ocorreu conversão total de CO em CO2 a 400 °C, enquanto que em 100 mL.min-1 a conversão foi de aproximadamente 60%. Com o uso da perovskita como catalisador o processo de oxidação é completo a 400 °C, enquanto que na reação sem catalisador a conversão completa é alcançada somente a 550 °C. Apesar da sua pequena área superficial, o BaCeO3 é altamente reativo na oxidação do monóxido de carbono.

  15. Uso de lagoa aerada facultativa como polimento do reator anaeróbio de manta de lodo UASB no tratamento de dejetos de suínos em escala laboratorial The efficiency of an aerated pond used for treating the effluent of an UASB reactor (upflow anaerobic sludge blanket reactor treating swine manure in a lab-scale system

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    Fernanda Ribeiro do Carmo

    2004-06-01

    Full Text Available As atividades agroindustriais têm se voltado não somente para o aumento da produtividade, mas também para a conservação do meio ambiente. A suinocultura é, sem dúvida, uma das atividades agroindustriais mais poluidoras, principalmente no Estado de Minas Gerais. Sendo assim, objetivou-se desenvolver e operar uma Lagoa Aerada Facultativa (LAF em escala de bancada (laboratorial, e como polimento de um Reator Anaeróbio de Manta de Lodo (UASB, visando a tratar os dejetos de suínos com máxima eficiência e custo mínimo. O experimento foi conduzido no Laboratório de Análise de Água do Departamento de Engenharia (LAADEG da Universidade Federal de Lavras (UFLA, sendo composto por um tanque de acidificação e equalização (TAE, um reator anaeróbio de manta de lodo (UASB e uma lagoa aerada facultativa (LAF para polimento. As análises fisico-químicas realizadas foram: pH, DBO5, DQO T, Sólidos Totais (fixos e voláteis, Temperatura, Nitrogênio, Fósforo, Alcalinidade e Acidez Total. A unidade LAF mostrou uma eficiência média de 83 e 42% de DQO T e Nitrogênio Total, respectivamente. O sistema proporcionou remoção média de 93, 84 e 85% de DQO T, DBO5 e Sólidos Totais Voláteis, respectivamente.Nowadays the agro-industry activities have not only focused its direction to the production increasing, but also, to the environmental preservation. The swine production is amo doubt, an activity, which can be considered, one of the most pollutants, mainly in the Minas Gerais State (BRAZIL. Therefore, this research aimed at developing and operating an Upflow Anaerobic Sludge Blanket Reactor (UASB, followed by an Aerobic Facultative Pound (AFP (Lab-Scale, with the objective of treating the liquid effluent originated from swine with the maximum efficiency and lower costs. The experiment was carried out in the Laboratory of Water Analysis of the Engineering Department of the Federal University of Lavras (UFLA. The system was assembled with an

  16. Eficiência de lagoas de polimento no pós-tratamento de reator UASB no tratamento de águas residuárias de suinocultura

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    A.C.A. Pinto

    2014-04-01

    Full Text Available Avaliou-se o desempenho de um sistema de lagoas seriadas que recebeu efluentes de reator UASB, no tratamento de águas residuárias de suinocultura. O sistema foi composto de reator anaeróbio de chicanas (RAC, reator UASB, em escala real, e uma série de lagoas (uma lagoa facultativa e três de maturação, em escala piloto. As análises físico-químicas realizadas foram: pH, demanda bioquímica de oxigênio (DBO, demanda química de oxigênio (DQO, sólidos suspensos totais (SST, sólidos suspensos voláteis (SSV, nitrogênio amoniacal (N-am., fósforo total (Pt, coliformes totais (CT e Escherichia coli (EC. As lagoas de pós-tratamento contribuíram eficientemente para remoção de nutrientes, matéria orgânica e sólidos, fornecendo um efluente com qualidade para o reuso agrícola ou lançamento em corpos d'água.

  17. Utilização de serragem de couro do tipo wet blue como meio suporte de filtros percoladores para pós-tratamento de esgoto sanitário tratado em reator anaeróbio compartimentado

    OpenAIRE

    Rita de Cascia Avelino Suassuna

    2004-01-01

    Nesta tese foi estudada a utilização da serragem de couro do tipo wet blue como meio suporte de filtros percoladores no pós-tratamento de esgoto sanitário. O desenvolvimento deu-se em três fases: na primeira fase foram realizadas a classificação e caracterização da serragem, bem como a sua preparação através de peneiramento, lavagens e secagem. Foram realizados dois tipos de lavagens: uma em batelada com solução alcalina de pH em torno de 9,0 e outra contínua com água corrente com pH em torno...

  18. Enriquecimento de microrganismos metanotróficos a partir de lodo de reator UASB tratando esgotos domésticos

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    Luciene Alves Batista Siniscalchi

    2016-03-01

    Full Text Available RESUMO Nesse estudo, microrganismos metanotróficos foram enriquecidos a partir de lodo proveniente de um reator UASB tratando esgotos domésticos em reator em batelada sequencial (RBS com meio autotrófico contendo nitrito e nitrato. As eficiências médias de remoção de nitrito e nitrato foram de 68% e 53%, respectivamente, provavelmente devido à atividade heterotrófica desnitrificante. A detecção de arquéias dos grupos ANME-I e ANME-II foram realizadas por PCR durante todo período de cultivo. A estrutura da comunidade microbiana presente no inóculo e enriquecida no RBS após 100 dias de operação foi estudada por pirosequenciamento. Os resultados das análises demonstraram que a comunidade enriquecida no reator foi diferente à inoculada. Os filos dominantes no inóculo foram Synergistestes , Firmicutes e Euryarchaeota , ao passo que na biomassa enriquecida Planctomycetes, Verrucomicrobia, Chloroflexi e Proteobacteria predominaram. As condições de cultivo do RBS reduziram a abundância de Methanobacterium (8% para 1% e selecionaram bactérias metanotróficas como Methylocaldum , Methylocistis e Methylosinus . As sequências de Methylocaldum sp. apresentaram abundância relativa de 2.5%. A presença e elevada predominância do filo Verrucomicrobia na biomassa enriquecida do RBS sugere que outras espécies de metanotróficas, ainda pouco conhecidas, relacionadas a este filo podem estar presentes no reator. O potencial de oxidação anaeróbia do metano foi determinado para ambas amostras e revelaram que a atividade metanotrófica da biomassa foi aproximadamente três vezes maior que a do inóculo. Em suma, estes resultados sugerem que o inóculo usado e as condições de cultivo aplicadas foram adequados para o enriquecimento de metanotróficas.

  19. Reactor network synthesis for isothermal conditions = Síntese de redes de reatores para condições isotérmicas

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    Lincoln Kotsuka da Silva

    2008-07-01

    Full Text Available In the present paper, a computational systematic procedure for isothermal Reactor Network Synthesis (RNS is presented. A superstructure of ideal CSTR and PFR reactors is proposed and the model is formulated as a constrained Nonlinear Programming (NLP problem. Complex reactions (series/parallel reactions are considered. The objective function is based on yield or selectivity, depending on the desired product, subject to different operational conditions. The problem constraints are mass balances in the reactorsand in the considered reactor network superstructure. A systematic computational procedure is proposed and a Genetic Algorithm (GA is developed to obtain the optimal reactor arrangement with the maximum yield or selectivity and minimum reactor volume. Results are as good as or better than those reported in the literature.No presentetrabalho apresenta-se um procedimento computacional para síntese de redes de reatores (SRR operando em condições isotérmicas. Uma superestrutura de rede de reatores formada por reatores ideais CSTR e PFR é proposta e o problema apresenta uma formulação de programação não linear (PNL. São consideradas reações complexas (série/paralelas. A função objetivo é baseada no rendimento ou na seletividade em relação ao produto desejado, sujeito a diferentes condições de operação. As restrições ao problema são provenientes dos balanços de massa e da configuração da superestrutura considerada.No procedimento computacional é proposto um Algoritmo Genético (AG para obtenção do arranjo ótimo de reatores com máximo rendimento ou seletividade com menor volume reacional. Os resultados obtidos são condizentes com os obtidos na literatura.

  20. Modelagem de um reator integral aplicado na reação de reforma a vapor de metano - DOI: 10.4025/actascitechnol.v29i2.705

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    Giane Gonçalves Lenzi

    2008-02-01

    Full Text Available Freqüentemente, a validação de modelos matemáticos aplicados a reatores industriais esbarra na dificuldade de obtenção de medidas experimentais confiáveis. Uma maneira de contornar esta limitação corresponde à implantação de uma unidade em escala de bancada devidamente instrumentada, na qual são obtidos dados experimentais em condições controladas. Neste contexto, foram efetuados ensaios em um reator integral de reforma a vapor de metano em escala de bancada, em diversas condições experimentais. As medidas de temperatura no leito foram efetuadas por meio de um termopar multiponto em seis posições axiais distintas, enquanto a composição do efluente do reator foi determinada por cromatografia gasosa. Estes dados experimentais foram comparados com as previsões de um modelo pseudo-homogêneo, unidimensional e dinâmico. Os resultados indicam que o modelo é adequado, sendo que tanto a atividade catalítica como a conversão são sensíveis à temperatura operacional, enquanto a temperatura do leito é praticamente insensível à vazão nas condições experimentais exploradas.

  1. Avaliação de um reator de lodo ativado aplicado à nitrificação utilizando ensaios cinéticos = Evaluation of an activated sludge reactor applied to nitrification using kinetic assays

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    Valeria Reginatto

    2008-01-01

    Full Text Available Neste trabalho, um reator em escala laboratorial de lodo ativado, aplicado ao processo da nitrificação, foi acompanhado por meio de ensaios cinéticos de atividade específica. A atividade de nitrificação da biomassa foi determinada por respirometria nacaracterização do inóculo e na avaliação da biomassa do reator em duas condições: durante a alimentação do reator com meio sintético autotrófico; e após a sua alimentação com efluente de um reator UASB, utilizado para desnitrificação. O reator atingiu uma eficiência em torno de 90% de nitrificação em ambas as condições de operação. O modelo cinético de Andrews, que inclui uma constante da inibição pelo substrato (Ki, ajustou-se melhor aos resultados obtidos nos testes de atividade do que o de Monod. Entretanto, observou-se aumento daconstante de inibição (Ki do lodo após operação do reator em relação ao inóculo, demonstrando a adaptação da biomassa às novas condições (cargas de nitrificação.In this work, an activated sludge lab-scale reactor used fornitrification was monitored by specific activity kinetic assays. The nitrification biomass activity was carried out by respirometric methods in order to characterize the inoculum and the reactor sludge after two different operation conditions: during the feeding of the reactor with synthetic autotrophic medium, and after feeding it with effluent from an UASB reactor used for denitrification. The efficiency of nitrification reached 90% in both operation conditions. Results obtained by the kinetic activity assays were better adjusted by the kinetic model of Andrews, which includes the inhibition constant by the substrate (Ki, than the Monod model. However, an increase was observed in the inhibition constant (Ki of the sludge after the operation of the reactor as compared with the inoculum. This effect demonstrates an adaptation of the biomass to the new nitrification conditions (loading rate.

  2. Analytical solution of neutron transport equation in an annular reactor with a rotating pulsed source; Resolucao analitica da equacao de transporte de neutrons em um reator anelar com fonte pulsada rotativa

    Energy Technology Data Exchange (ETDEWEB)

    Teixeira, Paulo Cleber Mendonca

    2002-12-01

    In this study, an analytical solution of the neutron transport equation in an annular reactor is presented with a short and rotating neutron source of the type S(x) {delta} (x- Vt), where V is the speed of annular pulsed reactor. The study is an extension of a previous study by Williams [12] carried out with a pulsed source of the type S(x) {delta} (t). In the new concept of annular pulsed reactor designed to produce continuous high flux, the core consists of a subcritical annular geometry pulsed by a rotating modulator, producing local super prompt critical condition, thereby giving origin to a rotating neutron pulse. An analytical solution is obtained by opening up of the annular geometry and applying one energy group transport theory in one dimension using applied mathematical techniques of Laplace transform and Complex Variables. The general solution for the flux consists of a fundamental mode, a finite number of harmonics and a transient integral. A condition which limits the number of harmonics depending upon the circumference of the annular geometry has been obtained. Inverse Laplace transform technique is used to analyse instability condition in annular reactor core. A regenerator parameter in conjunction with perimeter of the ring and nuclear properties is used to obtain stable and unstable harmonics and to verify if these exist. It is found that the solution does not present instability in the conditions stated in the new concept of annular pulsed reactor. (author)

  3. Reator anaeróbio tipo UASB conjugado com processo Fenton para remoção de cor e demanda química de oxigênio de água residuária sintética de indústria têxtil

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    Emília Maria Alves Santos

    Full Text Available RESUMO A contaminação por despejos de efluentes industriais têxteis tem sido uma preocupação emergente de pesquisadores e ambientalistas, pois esses apresentam composição extremamente heterogênea e grande quantidade de material tóxico e recalcitrante, o que dificulta seu tratamento. Durante o processamento têxtil, uma ampla gama de corantes é liberada e alguns desses, como os azo corantes, que se caracterizam pela função azo (-N=N- ligada a grupos aromáticos e podem ser tóxicos, carcinogênicos e/ou mutagênicos. Em vista disso, esta pesquisa teve como principal objetivo avaliar os benefícios da utilização de um reator anaeróbio tipo reator anaeróbico de fluxo ascendente com manta de lodo (UABS, seguido de processo oxidativo avançado (POA do tipo Fenton na degradação de cor e demanda química de oxigênio (DQO de efluente sintético de indústria têxtil. Com os resultados, foram verificadas remoções de DQO em torno de 82,0% para o reator UASB e de 95,6% para o conjunto. A cor alcançou 96,1% de remoção no reator UASB e 100,0% ao final do processo.

  4. Avaliação da suscetibilidade à corrosão sob tensão da ZAC do aço inoxidável AISI 316L em ambiente de reator nuclear PWR Stress corrosion cracking of stainless steel AISI 316L HAZ in PWR Nuclear reactor environment

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    Mônica Maria de Abreu Mendonça Schvartzman

    2009-09-01

    Full Text Available Aços carbono de baixa liga e aços inoxidáveis são amplamente utilizados nos circuitos primários de reatores nucleares do tipo PWR (Pressurized Water Reactor. Ligas de níquel são empregadas na soldagem destes materiais devido a características como elevadas resistências mecânica e à corrosão, coeficiente de expansão térmica adequado, etc. Nos últimos 30 anos, a corrosão sob tensão (CST tem sido observada principalmente nas regiões das soldas entre materiais dissimilares existentes nestes reatores. Este trabalho teve como objetivo avaliar, por comparação, a suscetibilidade à corrosão sob tensão da zona afetada pelo calor (ZAC do aço inoxidável austenítico AISI 316L quando submetida a um ambiente similar ao do circuito primário de um reator nuclear PWR nas temperaturas de 303ºC e 325ºC. Para esta avaliação empregou-se o ensaio de taxa de deformação lenta - SSRT (Slow Strain Rate Test. Os resultados indicaram que a CST é ativada termicamente e que a 325ºC pode-se observar a presença mais significativa de fratura frágil decorrente do processo de corrosão sob tensão.In pressurized water reactors (PWRs, low alloy carbon steels and stainless steel are widely used in the primary water circuits. In most cases, Ni alloys are used to joint these materials and form dissimilar welds. These alloys are known to accommodate the differences in composition and thermal expansion of the two materials. Stress corrosion cracking of metals and alloys is caused by synergistic effects of environment, material condition and stress. Over the last thirty years, CST has been observed in dissimilar metal welds. This study presents a comparative work between the CST in the HAZ (Heat Affected Zone of the AISI 316L in two different temperatures (303ºC and 325ºC. The susceptibility to stress corrosion cracking was assessed using the slow strain rate tensile (SSRT test. The results of the SSRT tests indicated that CST is a thermally

  5. Simetria das medidas timpanométricas e as respostas das emissões otoacústicas transientes em neonatos

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    Liliane Aparecida Fagundes Silva

    2014-12-01

    Full Text Available OBJETIVO: verificar a ocorrência de simetria maior ou igual à 70%, entre as orelhas, comparando os resultados da timpanometria nas frequências de 226 e 1000Hz com as respostas das emissões otoacústicas em neonatos. MÉTODOS: foram avaliados 39 neonatos, em média com 60 horas de vida, sendo 20 do sexo feminino e 19 do sexo masculino. Cada recém-nascido foi submetido à avaliação timpanométrica com as sondas de 226 e 1000 Hz, e avaliação das emissões otoacústicas transientes em ambas as orelhas. Os resultados foram submetidos a testes estatísticos. RESULTADOS: na análise da amostra pode-se observar ocorrência de simetria <70% nas respostas das emissões otoacústicas em 74,4% do total de neonatos. Por outro lado, na timpanometria, houve uma maior ocorrência de simetria ≥ 70%, tanto para sonda de 226 quanto para 1000Hz (76,9% e 84,6%, respectivamente. No que diz respeito ao gênero e orelha, as diferenças encontradas em cada teste não foram significantes, embora tenha sido observada maior amplitude de respostas de emissões otoacústicas na orelha direita. CONCLUSÃO: os resultados sugerem haver simetria no sistema auditivo em sua porção mais periférica, e início de assimetrias a partir da cóclea.

  6. Tratamento de esgotos sanitários em sistemas reatores UASB/wetlands construídas de fluxo horizontal: eficiência e estabilidade de remoção de matéria orgânica, sólidos, nutrientes e coliformes Domestic wastewater treatment in UASB-horizontal flow constructed wetlands systems: organic matter, solids, nutrients and coliforms removal

    Directory of Open Access Journals (Sweden)

    Maria Lúcia Calijuri

    2009-09-01

    Full Text Available Este trabalho apresentou os resultados de um estudo realizado durante 19 meses sobre o comportamento de wetlands construídas na remoção de matéria orgânica, sólidos, nutrientes e coliformes, em unidades em escala piloto de fluxo horizontal, subsuperficial e superficial, com tempo de detenção hidráulica entre 1,3 a 5,3 dias, operando como pós-tratamento de efluentes de reatores UASB (esgotos sanitários. A remoção de matéria orgânica e de sólidos mostrou-se elevada e estável, com eficiências médias de 70, 80 e 60% para SST, DBO5 e DQO, respectivamente. A remoção de nutrientes, após início promissor, mostrou-se instável e aparentemente influenciada pela temperatura. O sistema de tratamento revelou elevado potencial de remoção de coliformes, embora com variações relativamente amplas ao longo do período de operação: ≈ 2 log10 de remoção de coliformes totais e 2-4 log10 de remoção de Escherichia coli.This work presented the results of a 19-month study on the performance of constructed wetlands in terms of organic matter, solids, nutrients and coliforms removal in pilot scale unities with horizontal, subsurface and surface flow, with hydraulic retention time from 1.3 to 5.3 days, as post-treatment of UASB effluents (domestic wastewater. Organic matter and solids were effectively and consistently removed, with average values of 70, 80 and 60% for TSS, BOD5 and COD, respectively. Nutrients removal, after a promising start up, became unstable and apparently influenced by temperature. The treatment system has also shown high potential to remove coliforms, although with relatively wide variations over the study period: ≈ 2 log10 reduction of total coliforms and 2-4 log10 reduction of Escherichia coli.

  7. Avaliação de desempenho de reator UASB no tratamento de águas residuárias de suinocultura Evaluation of performance of UASB reactor in swine wastewater treatment

    Directory of Open Access Journals (Sweden)

    Luciano S. Rodrigues

    2010-01-01

    Full Text Available Este trabalho apresenta o desenvolvimento e a avaliação de um sistema de tratamento de águas residuárias de suinocultura constituído de decantador e seguido de reator anaeróbio de manta de lodo (reator UASB, em escala real. O reator UASB foi construído de alvenaria e concreto armado. Coletaram-se amostras do esgoto bruto e do efluente do decantador e reator UASB, e se monitoraram os seguintes parâmetros: temperatura, pH, alcalinidade, ácidos voláteis totais (AVT, sólidos suspensos totais (SST, sólidos suspensos voláteis (SSV, demanda bioquímica de oxigênio (DBO e demanda química de oxigênio (DQO, de acordo com os métodos estabelecidos pelo Standard Methods (APHA, 1998. Os resultados médios de remoção total de DQO e de DBO foram de 93 e 92%, respectivamente. As concentrações médias de DQO, DBO e SST no efluente final foram de 0,8, 1,8 e 0,8 g L-1, respectivamente. A carga orgânica volumétrica (COV aplicada no reator UASB variou de 1,1 a 17,5 kg DQO m-3 d-1. O sistema decantador-reator UASB apresenta-se como alternativa promissora para o tratamento de águas residuárias de suinocultura.This research presents the development and evaluation of a system for treatment of swine wastewaters constituted by slat settler, followed by upflow anaerobic sludge blanket (UASB reactor, at full scale. The UASB reactor was completely made of masonry and reinforced concrete. The evaluation of the treatment system was carried out through samples collected in the influent and effluent from the settler and UASB reactor. The following parameters were analyzed: temperature, pH, alkalinity, total volatile acids (VFA, suspended solids (TSS, volatile suspended solids (VSS, biochemical oxygen demand (BOD, chemical oxygen demand (COD, according to the methods established by the Standard Methods (APHA, 1998. The mean results of COD and BOD removal were 93 and 92%, respectively. The mean concentrations of COD, BOD and TSS in the final effluent were

  8. Desempenho de reator anaeróbio-aeróbio de leito fixo no tratamento de esgoto sanitário Performance of anaerobic-aerobic packed-bed reactor in the treatment of domestic sewage

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    Sérgio Brasil Abreu

    2008-06-01

    Full Text Available Este artigo relata a avaliação do desempenho de um reator anaeróbio-aeróbio, preenchido com espuma de poliuretano, para tratamento de esgoto sanitário. Inicialmente, foram testados diferentes tempos de detenção hidráulica (TDH no reator que operou apenas em condições anaeróbias. Em seguida, foi operado o reator combinado anaeróbio-aeróbio. O melhor resultado para o reator em operação exclusivamente anaeróbia foi para o TDH de 10 horas, no qual se conseguiu reduzir a DQO de 389 ± 70 mg/L para 137 ± 16 mg/L. Para o reator anaeróbio-aeróbio, a DQO foi reduzida de 259 ± 69 mg/L para 93 ± 31 mg/L para TDH de 12 h (6 h no estágio anaeróbio e 6 h no aeróbio. A comparação de todos os resultados obtidos evidenciou a importância do pós-tratamento aeróbio na remoção de parcela de matéria orgânica não removida em tratamento unicamente anaeróbio.This paper reports on the performance evaluation of an upflow anaerobic-aerobic reactor, filled with polyurethane matrices, for domestic sewage treatment. Initially, different hydraulic retention times were assayed with the reactor operating exclusively in anaerobic condition. Afterwards, anaerobic-aerobic combined reactor was operated. The anaerobic operation with HRT of 10 h provided the best organic matter removal with COD reduction from 389 ± 70 mg/L to 137 ± 16 mg/L. Under anaerobic-aerobic condition, the COD dropped from 259 ± 69 mg/L to 93 ± 31 mg/L with HRT of 12 h (6 h in anaerobic and 6 h in aerobic stages. Finally, comparing all the obtained results, it was possible to verify the importance of the aerobic post treatment in the removal of part of the organic matter not removed in an exclusively anaerobic treatment.

  9. Computer simulation of thermal-hydraulic transient events in multi-circuits with multipumps; Simulacao computacional de eventos termo-hidraulicos transitorios em multicircuitos com multibombas

    Energy Technology Data Exchange (ETDEWEB)

    Veloso, Marcelo Antonio

    2003-07-01

    PANTERA-2 (from Programa para Analise Termo-hidraulica de Reatores a Agua - Program for Thermal-hydraulic Analysis of Water Reactors, Version 2), whose fundamentals are described in this work, is intended to carry out rod bundle subchannel analysis in conjunction with multiloop simulation. It solves simultaneously the conservation equations of mass, axial and lateral momentum, and energy for subchannel geometry coupled with the balance equations that describe the fluid flows in any number of coolant loops connected to a pressure vessel containing the rod bundle. As far as subchannel analysis is concerned, the basic computational strategy of PANTERA-2 comes from COBRA codes, but an alternative implicit solution method oriented to the pressure field has been used to solve the finite difference approximations for the balance laws. The results provided by the subchannel model comprise the fluid density, enthalpy, flow rate, and pressure fields in the subchannels. The loop model predicts the individual loop flows, total flow through the pressure vessel, and pump rotational speeds as a function of time subsequent to the failure of any number of the coolant pumps. The flow transients in the loops may initiated by partial, total or sequential loss of electric power to the operating pumps. Transient events caused by either shaft break or rotor locking may also be simulated. The changes in rotational speed of the pumps as a function of rime are determined from a torque balance. Pump dynamic head and hydraulic torque are calculated as a function of rotational speed and volumetric flow from two polar homologous curves supplied to the code in the tabular form. In order to illustrate the analytical capability of PANTERA-2, three sample problems are presented and discussed. Comparisons between calculated and measured results indicate that the program reproduces with a good accuracy experimental data for subchannel exit temperatures and critical heat fluxes in 5x5 rod bundles. It

  10. Modelagem de um reator integral aplicado na reação de reforma a vapor de metano = Modeling of integral reactor applied methane steam reforming

    Directory of Open Access Journals (Sweden)

    Giane Gonçalves

    2007-07-01

    Full Text Available Freqüentemente, a validação de modelos matemáticos aplicados a reatores industriais esbarra na dificuldade de obtenção de medidas experimentais confiáveis. Uma maneira de contornar esta limitação corresponde à implantação de uma unidade em escala de bancada devidamente instrumentada, na qual são obtidos dados experimentais emcondições controladas. Neste contexto, foram efetuados ensaios em um reator integral de reforma a vapor de metano em escala de bancada, em diversas condições experimentais. As medidas de temperatura no leito foram efetuadas por meio de um termopar multiponto em seis posições axiais distintas, enquanto a composição do efluente do reator foi determinada por cromatografia gasosa. Estes dados experimentais foram comparados com as previsões de um modelo pseudo-homogêneo, unidimensional e dinâmico. Os resultados indicam que o modelo é adequado, sendo que tanto a atividade catalítica como a conversão são sensíveis à temperatura operacional, enquanto a temperatura do leito é praticamente insensível à vazão nas condições experimentais exploradas.Frequently, the validation of applied mathematical models of industrial reactors dash into the difficulty of obtaining reliable experimental data. A way to overcome this limitation is the proper use and operation or a in bench scale, experimental setup from whichexperimental data can be obtained in controlled conditions. In this context, experiments were carried out in an integral reactor of steam reform, in different experimental conditions. Thermocouples were placed along the catalyst bed to allow for temperature monitoring in six equally spaced and distinct positions of the reactor, the composition of the effluent of the reactor was determined by gas chromatography. These experimental data were compared with the theoretical results of a pseudo-homogeneous one-dimensional,dynamic mathematical model. The results indicate that the model can successfully

  11. Wavelet analysis for nonstationary signals; Analise de sinais em regime transiente aplicando a tecnica de wavelet

    Energy Technology Data Exchange (ETDEWEB)

    Penha, Rosani Maria Libardi da

    1999-07-01

    Mechanical vibration signals play an important role in anomalies identification resulting of equipment malfunctioning. Traditionally, Fourier spectral analysis is used where the signals are assumed to be stationary. However, occasional transient impulses and start-up process are examples of nonstationary signals that can be found in mechanical vibrations. These signals can provide important information about the equipment condition, as early fault detection. The Fourier analysis can not adequately be applied to nonstationary signals because the results provide data about the frequency composition averaged over the duration of the signal. In this work, two methods for nonstationary signal analysis are used: Short Time Fourier Transform (STFT) and wavelet transform. The STFT is a method of adapting Fourier spectral analysis for nonstationary application to time-frequency domain. To have a unique resolution throughout the entire time-frequency domain is its main limitation. The wavelet transform is a new analysis technique suitable to nonstationary signals, which handles the STFT drawbacks, providing multi-resolution frequency analysis and time localization in a unique time-scale graphic. The multiple frequency resolutions are obtained by scaling (dilatation/compression) the wavelet function. A comparison of the conventional Fourier transform, STFT and wavelet transform is made applying these techniques to: simulated signals, arrangement rotor rig vibration signal and rotate machine vibration signal Hanning window was used to STFT analysis. Daubechies and harmonic wavelets were used to continuos, discrete and multi-resolution wavelet analysis. The results show the Fourier analysis was not able to detect changes in the signal frequencies or discontinuities. The STFT analysis detected the changes in the signal frequencies, but with time-frequency resolution problems. The wavelet continuos and discrete transform demonstrated to be a high efficient tool to detect

  12. Avaliação hidrodinâmica de reator UASB submetido à variação cíclica de vazão Hydrodynamic evaluation of a UASB reactor submitted to cyclical flowrate variation

    Directory of Open Access Journals (Sweden)

    Karina Querne de Carvalho

    2008-06-01

    Full Text Available Um reator UASB em escala piloto (160 l foi usado com o objetivo de estudar seu comportamento hidrodinâmico quando submetido a variações cíclicas senoidais da vazão afluente. Os ensaios foram realizados com traçador eosina Y para as condições operacionais: vazão média afluente constante e igual a 16 l.h-1 e tempo de detenção hidráulica de 10 h (ensaios 1 e 2, e para vazão afluente submetida à variação senoidal de 40% (ensaios 3 e 4 e de 60% (ensaio 5. A variação da concentração do traçador no efluente foi ajustada pelos modelos teóricos de dispersão de fluxo e de reatores em série. O reator UASB apresentou comportamento similar ao de reator de mistura completa para vazão média afluente constante e similar ao reator de fluxo pistonado com a aplicação das variações senoidais cíclicas, sendo que o modelo de pequena dispersão apresentou melhor ajuste matemático.A bench scale UASB reactor (160 l was used in stimulus-response assays in order to evaluate its behaviour when submitted to cyclical sinusoidal variations of the influent flow rate. Assays were carried out with eosin Y as the tracer in different operational conditions: constant mean influent flow rate of 16 l.h-1 and hydraulic residence time of 10 h (assays 1 and 2, and influent flow rate submitted to sinusoidal variation of 40% (assays 3 and 4 and 60% (assay 5. The variation of tracer concentration in the effluent was adjusted by the theoretical models of dispersion (low and high and N-continuous stirred tank reactors in series. Complete mixture behaviour was noted to the application of the constant influent flow rate and a plug flow one to the application of the cyclical sinusoidal variations of the influent flow rate. The low dispersion model demonstrated the best mathematical adjustment in the RTD.

  13. Simulação numérica aplicada para avaliar o efeito da pré-polimerização no comportamento de reatores tubulares Numerical simulation to evaluate the effect from pre-polymerization on the behavior of tubular reactors

    Directory of Open Access Journals (Sweden)

    André L. Nogueira

    2007-09-01

    Full Text Available O presente estudo utiliza um modelo matemático fenomenológico para simular um sistema de polimerização contínuo em dois estágios. Este sistema é composto por um reator contínuo tipo tanque agitado (CSTR, para pré-polimerização do monômero (primeiro estágio, associado em série a um reator tubular para conduzir a reação até elevados valores de conversão (segundo estágio. Um modelo detalhado, considerando variações axiais e radiais, assim como operação não-isotérmica, foi utilizado para simular o comportamento do reator tubular em diferentes situações. Um modelo de caracterização também foi desenvolvido para fornecer estimativas do peso molecular médio e do índice de polidispersão do polímero. Os resultados mostram que reações de polimerização conduzidas em sistemas contínuos de dois estágios fornecem um polímero com propriedades menos heterogêneas do que um polímero obtido em um sistema reacional composto por apenas um reator tubular. Além disso, quanto maior a viscosidade da mistura reacional alimentada ao reator tubular, mais homogêneo é o polímero obtido.The present study uses a phenomenological model to simulate a continuous, two-stage polymerization process. This system is composed by a continuous stirred tank reactor (CSTR for monomer pre-polymerization (first stage, connected to a tubular reactor (second stage to carry out the reaction up to high conversion values. A comprehensive non-isothermal 2-D model (axial and radial variations was used to predict the tubular reactor behavior. A polymer characterization model was also developed to provide estimates of the polymer average molecular weight and polydispersity. According to the results, polymerization reactions carried out in a continuous two-stage system provide a polymer with less heterogeneous properties than the one obtained in a single tubular reactor. Besides, it is possible to produce a more homogeneous polymer increasing the viscosity

  14. Tratamentos integrados em efluente metal-mecânico: precipitação química e biotratamento em reator do tipo air-lift Integrated treatments for metalworking effluent: chemistry precipitation and biotreatment in air-lift reactor type

    Directory of Open Access Journals (Sweden)

    Daniel Delgado Queissada

    2011-06-01

    Full Text Available Os objetivos deste trabalho foram: realizar a caracterização físico-química de um efluente metal-mecânico e efetuar o tratamento integrado (precipitação química e biotratamento, utilizando micro-organismos autóctones do efluente (FI e FV e uma referência (A. niger. A caracterização indicou pH de 1,7; cor de 1.495 mg Pt.L-1; demanda química de oxigênio de 9.147 mgO2.L-1; 887 mg.L-1 de óleo e graxa, além de 2,5 mgO2.L-1 de oxigênio dissolvido. Com o tratamento por precipitação química, obteve-se, em pH = 7,5, a redução de todos os íons metálicos investigados. Após o biotratamento, a cor foi reduzida em 95%, utilizando o micro-organismos FV. As reduções da demanda química de oxigênio e de óleo e graxa foram mais significativas utilizando FI, que reduziu os mesmos em 52 e 62%, respectivamente. Estes resultados indicaram que os micro-organismos autóctones do efluente foram mais eficazes no tratamento do mesmo do que o organismo de referência A. niger.The objectives of this paper were: to perform the physical-chemical characterization of a metalworking effluent and to carry out the integrated treatment (chemical precipitation and biotreatment, using effluent autochthonous microorganisms (FI and FV and a reference (A. niger. The characterization indicated pH of 1.7; color, 1,495 mg Pt.L-1; chemical oxygen demand, 9,147 mgO2.L-1; oil and grease, 887 mg.L-1, and dissolved oxygen with 2.5 mgO2.L-1. With the chemical precipitation treatment, in pH = 7.5, the reduction of all the investigated metallic ions was obtained. The color was reduced 95% after the biotreatment using the FV microorganism. The chemical oxygen demand and oil and grease reductions were more significant when using FI, which reduced the same in 52 and 62%, respectively. These results indicated that the autochthonous microorganisms were more efficient in the effluent treatment than the reference organism A. niger.

  15. Avaliação do comportamento hidrodinâmico de reator anaeróbio de manta de lodo e fluxo ascendente com diferentes configurações do sistema de distribuição do afluente utilizando fluidodinâmica computacional

    Directory of Open Access Journals (Sweden)

    Diego Bongiorno Cruz

    Full Text Available RESUMO Compreender o comportamento hidrodinâmico de reatores biológicos pode auxiliar na detecção de problemas associados a falhas operacionais e de projeto, situações que prejudicam a eficiência do tratamento. Neste artigo, realizaram-se simulações da fluidodinâmica computacional (CFD de escoamento de duas fases sólida-líquida de um reator anaeróbio de manta de lodo e fluxo ascendente (UASB, em escala piloto (160 L, com tempo de detenção hidráulica (TDH de 10 h e vazão de 16 L.h-1. Um modelo Euler-Euler simplificado foi formulado para simular o comportamento hidrodinâmico da zona de reação, influenciada pela configuração do sistema de distribuição do afluente. Foram avaliadas quatro configurações do sistema de distribuição do afluente no reator: uma entrada na parte central (1 e duas entradas centrais (2, de fluxo ascendente; duas entradas nas laterais (3, de fluxo radial; e três entradas de fluxo descendente (4, utilizando geometrias bidimensionais e tridimensionais para verificar a formação de zonas mortas, curtos-circuitos hidráulicos e caminhos preferenciais. As melhores características hidrodinâmicas e a melhor distribuição do afluente foram verificadas na configuração 4, com melhor perfil de mistura do lodo com a fase líquida, na comparação com as demais configurações. Foi notada formação de vórtices na parte inferior do reator com maior concentração do lodo anaeróbio nessa configuração e de caminhos preferenciais nas laterais do reator na configuração 3, indicando mistura ineficiente do afluente com o lodo anaeróbio. O modelo demonstrou que a configuração do sistema de distribuição do afluente influencia significativamente o comportamento hidrodinâmico do reator UASB.

  16. Síntese de sistemas de reatores para a reação de Trambouze = Synthesis of reactor networks for Trambouze’s reaction

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    Admilson Lopes Vieira

    2009-01-01

    Full Text Available Atualmente, a síntese de sistemas de reatores é normalmente abordada por procedimentos heurísticos nos cursos de graduação em Engenharia Química e como um problema de otimização matemática nos cursos de pós-graduação. A técnica da região acessível se propõe a abordar o problema do ponto de vista geométrico, procurando identificar todas aspossíveis saídas, para dada alimentação e determinada cinética, mas não a ótima da rede de reatores que possibilite a maior conversão. O objetivo deste trabalho é apresentar essa técnica, aplicada à síntese de um sistema de reatores para uma reação de Trambouze para vários valores das constantes cinéticas. Para a implementação da técnica, utilizou-se o software Matlab. A técnica mostrou-se poderosa e de fácil execução, principalmente pelo uso do Matlab, que já possui embutida uma função que encontra regiões côncavas.Currently, the synthesis of reactor networks is usually approached by heuristic procedures in undergraduate chemical engineering courses and as a problem of mathematical optimization in graduate level courses. The attainable region approach addresses reactornetwork feasibility, for a given composition and a given system of reactions based on geometric properties, and allows one to identify feasibility, but not optimal reactor sequences for the production of a desired product. The objective of this work is to presentthe attainable region technique, applied to the synthesis of reactor networks for a chemistry reaction that follows the kinetics proposed by Trambouze’s reaction, for different kinetic constants. For the implementation of this technique, the software Matlab was used. Thetechniques proved to be powerful and of easy implementation, especially by using Matlab, which already features a built-in function to find concave regions.

  17. Desenvolvimento de um kit de reator de leito fixo de bagaço de cana-de-açúcar para uso didático

    Directory of Open Access Journals (Sweden)

    Rafaelle Santiago

    2015-07-01

    Full Text Available É de fundamental importância o desenvolvimento de práticas de laboratório nos cursos de engenharia, porém os altos custos dos kits didáticos muitas vezes inviabilizam sua aquisição. No entanto, o presente trabalho teve como objetivo desenvolver um kit para aulas de cinética e reatores, utilizando materiais de fácil aquisição e com caráter ambiental, uma vez que o leito fixo é composto por bagaço de cana-de-açúcar. Para estudar a cinética, variou-se o volume de álcool etílico alimentado e a altura de leito fixo no reator, observando o comportamento do rendimento e da produtividade. Avaliou-se a influência da adição do álcool etílico e ácido acético na produção deste e avaliou-se a atividade operacional do recheio através do reuso do mesmo. A acidez do produto aumentou com o passar do tempo e após cerca de 12 horas manteve-se constante. O rendimento teve um aumento proporcional à diminuição do volume de alimentação e ao aumento da altura do leito fixo. Aplicando os valores obtidos em modelos de cinética de primeira e segunda ordem, concluiu-se que o modelo cinético de primeira ordem se ajustou melhor aos dados obtidos.

  18. Reator série chaveado por tiristores para fornos elétricos a arco

    OpenAIRE

    Marcelo Murta Gaspar Cardoso

    2006-01-01

    Este trabalho apresenta o conceito do Reator Série Chaveado por Tiristores, RSCT, para a otimização da conversão da energia elétrica na energia térmica dos fornos elétricos a arco de corrente alternada. A viabilidade do RSCT é demonstrada pela análise e simulação da operação dos fornos a arco, com e sem o reator série, e pelo detalhamento dos pontos críticos para a construção de uma chave estática com tiristores de média tensão, utilizando-se componentes disponíveis comercialmente no merca...

  19. Emissões otoacústicas evocadas transientes (EOAET: amplitude da resposta em recém-nascidos a termo e pré-termo Transient evoked otoacoustic emissions (TEOAE: response amplitude in term and pre-term neonates

    Directory of Open Access Journals (Sweden)

    Mônica C. A. Bassetto

    2003-01-01

    Full Text Available As emissões otoacústicas evocadas transientes (EOAET têm sido a técnica mais empregada nas triagens auditivas neonatais. Nos últimos anos, uma análise mais detalhada das EOAET tem evidenciado a presença de características até então pouco exploradas do sistema auditivo periférico. OBJETIVO: O objetivo deste trabalho foi o de estudar o comportamento da amplitude de resposta das EOAET em recém-nascidos a termo e pré-termo em função dos parâmetros lados da orelha, sexo, espectro de freqüência e idade pós-concepcional. FORMA DE ESTUDO: Clínico prospectivo. MATERIAL E MÉTODO: A amostra compôs-se de 526 recém-nascidos, sendo 440 nascidos a termo e 86 nascidos pré-termo. Estes últimos foram subdivididos em um grupo com idade pós-concepcional na data do teste variando entre 31 e 36 semanas e outro grupo com idade pós-concepcional na data do teste variando entre 37 e 44 semanas. O teste das EOAET foi realizado em ambiente sem tratamento acústico com o analisador de emissões otoacústicas ILO 88 da Otodynamics, no modo "Quickscreener". RESULTADO: Ao analisarmos os resultados, observamos assimetria significante da amplitude média de resposta a favor da orelha direita, do sexo feminino, das bandas de freqüências altas e dos recém-nascidos com maior idade pós-concepcional. Estas assimetrias sugerem que o parâmetro amplitude, além de fornecer evidência da presença das EOAET e portanto da integridade do sistema auditivo periférico, também pode ser tomado como um indicador de maturação do sistema auditivo periférico em recém-nascidos.Transient evoked otoacoustic emissions (TEOAE have been widely used in neonatal hearing screening programs. In the past years, a closer analysis of TEOAE has shown some unexplored characteristics of the peripheral auditory system. AIM: The aim of this paper was to study the TEOAE response amplitude in term and pre-term neonates, as a function of the ear side, gender, frequency spectrum and

  20. Influência da concentração de hidrogênio na suscetibilidade à corrosão sob tensão de junta soldada com metais dissimilares em ambiente do circuito primário de reator nuclear

    OpenAIRE

    Luciana Iglesias Lourenco Lima

    2011-01-01

    A corrosão sob tensão (CST) é um fenômeno que ocorre em componentes metálicos onde materiais suscetíveis estão sujeitos ao efeito simultâneo da tensão mecânica e de um ambiente aquoso de composições diversas. As ligas de níquel 600 e seus metais de adição (ligas de níquel 82 e 182) embora originalmente selecionados por sua alta resistência à corrosão, apresentaram, após cerca de 20 anos de operação, suscetibilidade ao processo de CST. As alternativas atuaisrelacionadas à mitigação da degradaç...

  1. Influência da imobilização de biomassa e do tamanho da partícula na fluidodinâmica de um reator anaeróbio de leito fluidizado = The influence of immobilized biomass and particle size on the fluid dynamics of an anaerobic fluidized bed reactor

    Directory of Open Access Journals (Sweden)

    Flavio Bentes Freire

    2008-01-01

    Full Text Available O estudo da fluidodinâmica é muito comum em diversas áreas relacionadas com a engenharia química, tais como nos processos de secagem e nos reatores químicos. Entretanto, em reatores biológicos empregados no tratamento de águas residuárias, esses aspectos ainda necessitam de investigações mais aprofundadas. Deste modo, é fundamental avaliar a influência da presença do biofilme no comportamento fluidodinâmico do reator, por meio de importantes parâmetros como, por exemplo, a velocidade de mínima fluidização, a expansão, a porosidade do leito e a velocidade terminal da partícula. O objetivo deste trabalho foi realizar uma investigação da fluidodinâmica de um reator anaeróbio de leito fluidizado, tratando uma água residuária sintética preparada a partir da solução utilizada para determinação de DBO, tendo o carvão ativado como meio suportepara a imobilização de biomassa. Especificamente, no trabalho, verificou-se que a biomassa imobilizada aumentou a densidade das partículas e alterou os principais parâmetros fluidodinâmicos avaliados.Fluid dynamic analysis is an important branch of several chemical engineering related areas, such as drying processes and chemical reactors. However, aspects concerning fluid dynamics in wastewater treatment bioreactors still require further investigation, as they highly influence process efficiency. Therefore, it is essential to evaluate the influence of biofilm on the reactor fluid dynamicbehavior, through the analysis of a few important parameters, such as minimum fluidization velocity, bed expansion and porosity, and particle terminal velocity. The main objective of the present work was to investigate the fluid dynamics of an anaerobic fluidized bed reactor, having activated carbon particles as support media for biomass immobilization. Reactor performance was tested using synthetic residual water, which was prepared using the solution employed in BOD determination. The results

  2. Uso de modelação matemática para projeto de câmaras mecanizadas de floculação em série em estações de tratamento de água The use of mathematical modeling to the design of continous flow completely mixed chambers in series for flocculation in water treatment plants

    Directory of Open Access Journals (Sweden)

    Luiz Di Bernardo

    2005-03-01

    Full Text Available A metodologia encontrada na literatura para a otimização do gradiente de velocidade médio em reatores de mistura completa, com câmaras em série de escoamento contínuo, a partir de ensaios em reator estático tipo jarteste, baseia-se em modelos matemáticos que descrevem a cinética dos encontros entre partículas durante a floculação. Considerando-se que a aplicabilidade desta metodologia tem-se revelado inconsistente, como observado por diversos autores, este trabalho propõe uma metodologia racional para utilizar e otimizar os dados experimentais obtidos em reatores estáticos e, utilizando modelos matemáticos, obter dados para o projeto de floculadores mecanizados em série em estações de tratamento de água.The existing methodology in the literature to optimize the velocity gradients in continuous flow completely mixed reactors using batch test data (static reactors is based on mathematical models that describe the flocculation kinetics. Since this methodology has been shown to be inconsistent, as observed by several researchers, this work was carried out in order to propose a rational methodology to optimize the static reactors experimental data to obtain the design parameters of mechanized flocculation systems for water treatment plants.

  3. Operação de filtros biológicos percoladores pós-reatores UASB sem a etapa de decantação secundária Operation of trickling filters post-UASB reactors without the secondary sedimentation stage

    Directory of Open Access Journals (Sweden)

    Paulo Gustavo Sertório de Almeida

    2011-09-01

    Full Text Available A pesquisa teve por objetivo avaliar filtros biológicos percoladores (FBP pós-reatores UASB operando sem a etapa de decantação secundária, em termos da remoção da demanda bioquímica e química de oxigênio (DBO e DQO e sólidos suspensos totais (SST. O aparato experimental consistia em um reator UASB que alimentava quatro FBP em paralelo, preenchidos com diferentes materiais suporte. O reator UASB operou em regime hidráulico permanente, e três condições operacionais foram impostas aos FBP durante o período experimental. Em geral, os sistemas UASB/FBP foram capazes de promover o atendimento aos padrões de lançamento. Em condições de baixas cargas orgânicas volumétricas (COV, o uso de materiais de enchimento de maior área superficial específica não proporcionou ganhos expressivos em termos de desempenho. Contudo, o uso de meio suporte baseado em espumas de poliuretano propiciou melhoria significativa na qualidade do efluente final. O uso de sistemas UASB/FBP sem decantadores secundários parece ser uma promissora alternativa para a simplificação operacional da tecnologia, e uma importante estratégia para o tratamento de efluentes domésticos em países em desenvolvimento. No entanto, o sucesso do emprego desta tecnologia fica condicionado ao correto gerenciamento do lodo anaeróbio do reator UASB, a fim de que sejam evitadas sobrecargas nos FBP.The research aimed at evaluating the operation of trickling filters (TF post-UASB reactors without the secondary sedimentation stage, in terms of biochemical and chemical oxygen demand (BOD and COD and total suspended solids (TSS removal. The experimental apparatus consisted of one UASB reactor followed by four TF in parallel, each one filled with a different packing media. The UASB reactor was operated at a permanent hydraulic regime, while three operational conditions were imposed to the TF during the experimental period. In general, the UASB/TF systems were able to comply with

  4. Enumeração e isolamento de bactérias anaeróbias facultativas num reator de fluxo ascendente e manta de lodo tratando efluente de uma indústria de gelatina - DOI: 10.4025/actascibiolsci.v25i2.1977 Enumeration and isolation of facultative anaerobic bacteria in an upflow anaerobic sludge blanket reactor treating wastewater from a gelatine industry- DOI: 10.4025/actascibiolsci.v25i2.1977

    Directory of Open Access Journals (Sweden)

    Celso Vataru Nakamura

    2003-04-01

    Full Text Available Neste trabalho foram determinados os níveis de bactérias anaeróbias facultativas em Reator de Fluxo Ascendente e Manta de Lodo (UASB utilizado no tratamento de efluente de industria de gelatina. A quantificação dos microrganismos apresentou similar valor na manta de lodo granular e na zona de fluidização. No compartimento de sedimentação do reator as bactérias foram dois logs menores. Estas comunidades são compostas principalmente de bacilos Gram-negativos. Os mais abundantes gêneros foram Acinetobacter, Aeromonas, Citrobacter, Escherichia, Klebsiella e Stenotrophomonas. O significado para a saúde pública das bactérias isoladas no reator UASB é desconhecido. Algumas espécies são residentes permanentes, outras são encontradas em somente uma parte da população, e ainda outras espécies são patógenos oportunistas que causam infecção humana. No presente estudo, nenhuma das bactérias predominantes pertence ao grupo dos patógenos estritosThis experiment measured levels of facultative anaerobic bacteria in an Upflow Anaerobic Sludge Blanket (UASB reactor treating wastewater from a gelatin industry. The microorganism quantification showed similar values in granular sludge bed and fluidized zone. In the settling compartment of reactor, the bacteria were two logs lower. These communities are composed mainly of Gram-negative rods. The most abundant genera isolated were Acinetobacter, Aeromonas, Citrobacter, Escherichia, Klebsiella and Stenotrophomonas. The significance of the bacteria isolated from UASB reactor for public health is unknown. Some species are permanent residents; other are found only in a fraction of the population, and still other species are opportunistic pathogens that cause human infections. In the present study, none of the predominant bacteria belonged to the group of strict pathogens

  5. Eficiência de um sistema de reatores anaeróbios no tratamento de efluentes líquidos de suinocultura =The efficiency of a sistem of anaerobic reactors treating swine wastewater.

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    Erlon Lopes Pereira

    2011-07-01

    Full Text Available Grande atenção tem sido dada pelos órgãos de fiscalização ambiental à produção confinada de suínos, pelo elevado potencial poluidor desse tipo de atividade. O grande desafio do suinocultor brasileiro é produzir, de forma intensiva, alimento com qualidade e ao mesmo tempo, ambientalmente sustentável. Por isso, sistemas anaeróbios de tratamento, como os que foram pesquisados neste trabalho, vêm se tornando merecedores de atenção na suinocultura em grande escala. Neste trabalho, as unidades de tratamento instaladas foram: caixa de retenção de sólidos (CRS, peneira estática (PE, tanque de acidificação e equalização (TAE, reator anaeróbio compartimentado (RAC, reator de manta de lodo (UASB e decantador. O sistema de tratamento apresentou os seguintes valores de eficiência: 91,50; 85,24; 80,46; 81,34; 79,15; 23,20 e 70,28% na remoção de DBO5, DQOtotal, sólidos totais, sólidos fixos, sólidos voláteis, fósforo total e óleos & graxas, respectivamente. Os reatores RAC e UASB operaram com tempo de detenção hidráulica de 15,4 e 9,7h, respectivamente; carga hidráulica de 1,57 m3 m-3 dia-1 para o RAC e 2,5 m3 m-3 dia-1 para o UASB; carga orgânica volumétrica de 4,46 kg m3 m-3 dia-1 para o RAC e 1,77 kg m3 m-3 dia-1 para o UASB. A produção média de biogás referente ao reator UASB, medida por meio de um gasômetro, foi de 437,08 L dia-1.Great attention has been given by environmental agencies concerning swine raising, due to the high pollutant potential of this type of activity. The challenge of Brazilian farmers is to produce, in an intensive form, high quality meat that is environmentally sustainable at the same time. Therefore, anaerobic treatment systems, such as those surveyed in this work, have gained attention in large-scale production. In this research, the installed units were: static screen (SS, equalization acidification tank (EAT, anaerobic baffled reactor (ABR, an upflow anaerobic sludge blanket reactor

  6. Partida de um reator anaeróbio horizontal para tratamento de efluentes do processamento dos frutos do cafeeiro Start-up of an anaerobic horizontal-flow reactor for treating wastewater from a coffee fruits processing

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    Alisson C. Borges

    2009-01-01

    Full Text Available O presente estudo teve o objetivo de avaliar a partida e a adaptação de um reator anaeróbio horizontal de leito fixo (RAHLF no tratamento de águas residuárias do processamento primário dos frutos do cafeeiro (ARC. O reator foi construído com tubos de PVC de 0,2 m de diâmetro e 3,2 m de comprimento. O sistema foi preenchido com cubos de espuma de poliuretano para imobilização de biomassa ativa. O reator apresentou volume total de 0,1 m³ e volume útil equivalente a 0,04 m³. Em média, houve remoção de 49% da matéria orgânica, com o reator trabalhando sob carga orgânica volumétrica média de 2,66 kg m-3 d-1, medida como DQO. A suplementação de alcalinidade, somada à inoculação prévia de biomassa, proporcionou partida estável do RAHLF, confirmada pelo consumo de ácidos voláteis e adaptação da microbiota ao resíduo. O sistema apresentou resistência às variações de vazão e de carga orgânica observadas, e os teores de fenol e potássio monitorados não causaram inibição da atividade biológica no RAHLF. O maior controle sobre as variações de carga é fator importante na continuidade dos estudos.This study aimed to evaluate the start-up and the adaptation of an anaerobic horizontal-flow immobilized biomass (HAIB reactor in order to treat wastewater from a primary processing of coffee fruits. The reactor was built with PVC tubes of 0.2 m in diameter and 3.2 m in length. The system was filled with cubes of polyurethane foam for immobilization of active biomass. The reactor presented a total capacity of 0.1 m³ and reaction volume equal to 0.04 m³. 49% of organic matter. Removal efficiency was observed, with medium organic volumetric loads equal to 2.66 kg m-3 d-1 (as chemical oxygen demand. The supplementary addition of alkalinity and the previous biomass inoculation provided a stable start-up of the reactor, as confirmed by the reduction of volatile acids and an adaptation of the present microbiology community

  7. Secondary decay of espalation in ADS reactors; Decaimento secundario de espalacao em reatores ADS

    Energy Technology Data Exchange (ETDEWEB)

    Rodrigues, Marcos Guedes; Santiago, A.J.; Silva, C.E. da, E-mail: marcos.tri@hotmail.com, E-mail: ajsant@uerj.br, E-mail: claudioelias13@gmail.com [Universidade do Estado do Rio de Janeiro (UERJ), RJ (Brazil). Instituto de Fisica. Departamento de Eletronica Quantica

    2013-07-01

    We study the problem of evaporation in the context of nuclear spallation reactions in nuclear reactors ADS. The calculation was developed based on the theory of Weisskopf evaporation and in the model of thermal liquid drop. Evaporation affects the 'economy' of neutrons and the design of a ADS reactor in various aspects. It offers abundant amount of neutrons in the nuclear medium, with a wide energy range. For an excitation energy of 3 MeV/n a typical core evaporates about 10% of its mass in the form of light particles (mostly neutrons)

  8. Transient analyzer

    International Nuclear Information System (INIS)

    Muir, M.D.

    1975-01-01

    The design and design philosophy of a high performance, extremely versatile transient analyzer is described. This sub-system was designed to be controlled through the data acquisition computer system which allows hands off operation. Thus it may be placed on the experiment side of the high voltage safety break between the experimental device and the control room. This analyzer provides control features which are extremely useful for data acquisition from PPPL diagnostics. These include dynamic sample rate changing, which may be intermixed with multiple post trigger operations with variable length blocks using normal, peak to peak or integrate modes. Included in the discussion are general remarks on the advantages of adding intelligence to transient analyzers, a detailed description of the characteristics of the PPPL transient analyzer, a description of the hardware, firmware, control language and operation of the PPPL transient analyzer, and general remarks on future trends in this type of instrumentation both at PPPL and in general

  9. Expressão transiente do gene gus, sob regulação de quatro promotores, em diferentes tecidos de mamoeiro (Carica papaya L. e videira (Vitis sp. Transient expression of the gus gene, under the regulation of four promoters, on different tissues of papaya (Carica papaya l. and grape (Vitis sp.

    Directory of Open Access Journals (Sweden)

    Adelar Almeida Pinto

    2002-12-01

    Full Text Available O mamoeiro (Carica papaya L. e a videira (Vitis vinifera L. destacam-se entre as fruteiras produzidas no Brasil por serem plantadas em quase todo o território nacional e apresentarem importância econômica e social. A tecnologia de produção de organismos geneticamente modificados, também conhecidos como "transgênicos", tem grande potencial de uso no desenvolvimento de fruteiras melhoradas. Porém, questões de propriedade intelectual limitam o uso da engenharia genética por países em desenvolvimento, que normalmente não detêm direitos sobre processos ou produtos necessários ao uso desta. Neste contexto, o presente estudo buscou avaliar promotores de expressão gênica alternativos ao CaMV 35S, que é o mais utilizado no desenvolvimento de transgênicos, mas é patenteado. Para tanto, construções gênicas com o gene gus sob a regulação de diferentes promotores foram testadas para expressão transiente em diversos tecidos de mamoeiro e videira. Expressão transiente foi avaliada em embriões somáticos, folhas, caules, raízes e frutos. O promotor do gene UBQ3, que é constitutivo e se encontra em domínio publico, mostrou ser uma alternativa promissora para futuros trabalhos de transformação genética de mamoeiro, mas não de videira.Papaya (Carica papaya L. and grapes (Vitis vinifera L. are among the most important fruit crops produced in Brazil, and are cultivated in several regions around the country being of economical and social importance. Genetic engineering has great potential on the development of genetically improved fruit crops. However, intellectual property issues constantly limit the commercial use of this technology in developing countries. Thus, the present study aimed to evaluate gene promoters as alternatives to the 35S CaMV, which is the most used so far in the development of transgenic plants, but it is patented. In order to do that, the expression of the gus gene under the regulation of distinct promoters was

  10. TRATAMENTO DE EFLUENTES ÁCIDOS RICOS EM METAIS COM AUXÍLIO DE SULFETO BIOGÊNICO E CAL

    OpenAIRE

    Guimarães, Damaris; Redemat - Rede Temática em Engenharia de Materiais (UFOP/CETEC/UEMG); Lopes, Klinger Carlos Silva; Laboratório de Bio&Hidrometalurgia – Escola de Minas – Universidade Federal de Ouro Preto; Rodrigues, Michael Leonardo Marques; Redemat - Rede Temática em Engenharia de Materiais (UFOP/CETEC/UEMG); Bertolino, Sueli Moura; Instituto de Ciências Agrárias - Universidade Federal de Uberlândia; Leão, Versiane Albis; Departamento de Engenharia Metalurgica e de Materiais - Laboratório de Bio&Hidrometalurgia – Escola de Minas – Universidade Federal de Ouro Preto

    2014-01-01

    A proposta do presente trabalho foi estudar uma forma de tratamento alternativo para efluentes líquidos ácidos ricos em metais utilizando para isso um efluente sulfetogênico gerado em um reator anaeróbio (UASB) e cal. Os ensaios foram realizados em batelada utilizando dois efluentes ácidos distintos: (i) um efluente proveniente de ensaios de lixiviação e (ii) um efluente ácido proveniente de um laboratório de pesquisas na área de Bio&Hidrometalurgia. O efluente dos ensaios de lixiviação apres...

  11. Transient cataract and hypermetropization in diabetes mellitus: case report Catarata transitória e hipermetropização em diabetes mellitus: relato de caso

    Directory of Open Access Journals (Sweden)

    Fernando Trindade

    2007-12-01

    Full Text Available A 13-year-old male patient with a recent history of hyperglycemia developed an acute bilateral posterior subcapsular cataract, consisting of fine feathery streak-like opacities. On examination, his uncorrected visual acuity was 20/50 and J4 at near in both eyes. Under cycloplegia, a moderate hypermetropic refraction was noted in both eyes. He was diagnosed with acute posterior subcapsular cataract secondary to diabetes mellitus. Two weeks after resolution of the hyperglycemic state, the bilateral feathery streak-like posterior subcapsular opacities regressed completely, hypermetropic refraction decreased and uncorrected visual acuity improved to 20/20 and J1 in both eyes.Paciente de 13 anos, com história recente de hiperglicemia, desenvolveu subitamente, catarata subcapsular posterior em ambos os olhos, consistindo de finas opacidades dispostas em forma de pena. A acuidade visual não corrigida era de 20/50 e de J4 para perto, em ambos os olhos. Sob cicloplegia, verificou-se em ambos os olhos uma moderada refração hipermetrópica. Foi, então, diagnosticado caso agudo de catarata subcapsular posterior secundária ao diabetes mellitus. Observou-se resolução total da opacidade subcapsular posterior em ambos os olhos duas semanas após regressão do quadro hiperglicêmico, assim como redução da refração hipermetrópica com melhoria da acuidade visual.

  12. Simulation of transient inadvertent safety injection system during power operation; Simulacao do transitorio de operacao inadvertida do sistema de injecao de seguranca durante operacao em potencia

    Energy Technology Data Exchange (ETDEWEB)

    Vanni, Enio Antonio [ELETROBRAS Termonuclear S.A. (ELETRONUCLEAR), Rio de Janeiro, RJ (Brazil). E-mail: vanni@eletronuclear.gov.br

    2000-07-01

    The Condition II transient Inadvertent Safety Injection System Operation During Power Operation described on item 15.2.14 of Angra 1 Final Safety Analysis Report (FSAR) has been analyzed. Simulations with RETRAN computer code have been performed to evaluate the consequences to the transient as the Boron Injection Tank (BIT) concentration is reduced from 20000 to 2000 ppm. The first simulation has been carried out for a BIT concentration of 20000 ppm, in order to compare RETRAN results with those presented on FSAR. It has been verified that RETRAN models used and the hypotheses adopted were correct. The second simulation has been performed for a BIT concentration of 2000 ppm. It has been proved that even for this lower concentration level the Departure from Nucleate Boiling ratio (DNBR) limit (1,3) has not been violated. (author)

  13. Analysis of transient otoacoustic emissions and brainstem evoked auditory potentials in neonates with hyperbilirubinemia Análise das emissões otoacústicas transientes e dos potenciais evocados auditivos do tronco encefálico em neonatos com hiperbilirrubinemia

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    Daniela Polo Camargo da Silva

    2009-06-01

    Full Text Available Hyperbilirubinemia is toxic to the auditory pathways and to the central nervous system, leaving sequelae such as hearing loss and encephalopathy. AIM: to assess the hearing of neonates with hyperbilirubinemia, using transient evoked otoacoustic emissions (TOAEs and brainstem evoked auditory potentials (BEAP. Prospective study. MATERIALS AND METHODS: we had two groups: GI (n-25, neonates with hyperbilirubinemia; GII (n-22, neonates without hyperbilirubinemia and without risk factors for hearing loss. All the neonates had up to 60 days of life and were submitted to TOAE and BEAP. RESULTS: 12 neonates from GI and 10 from GII were girls and 13 from GI and 12 from GII were boys. TOAEs were present in all the children, however with lower amplitudes in GI, especially in the frequencies of 2 and 3KHz (p A hiperbilirrubinemia é tóxica às vias auditivas e ao sistema nervoso central, deixando sequelas como surdez e encefalopatia. OBJETIVOS: avaliar a audição de neonatos portadores de hiperbilirrubinemia, utilizando-se a pesquisa das emissões otoacústicas evocadas transientes (EOAET e dos potenciais evocados auditivos do tronco encefálico (PEATE. Estudo prospectivo. CASUÍSTICA E MÉTODOS: Constituíram-se dois grupos: GI (n-25, neonatos com hiperbilirrubinemia; GII (n-22, neonatos sem hiperbilirrubinemia e sem fatores de risco para surdez. Todos os neonatos tinham até 60 dias de vida e foram submetidos à EOAET e ao PEATE. RESULTADOS: 12 neonatos de GI e 10 de GII eram meninas e 13 de GI e 12 de GII eram meninos. As EOAET estavam presentes em todas as crianças, porém com amplitudes menores em GI, especialmente nas frequências de 2 e 3KHz (p < 0,05. No PEATE, observou-se discreto prolongamento de PV e de LI-V em GI. As alterações observadas nesses testes não se correlacionaram aos níveis séricos da bilirrubinemia. CONCLUSÕES: Em neonatos portadores de hiperbilirrubinemia, menores amplitudes das EOAET e discreto prolongamento de PV e de LI

  14. APLICAÇÃO DE SISTEMAS DE WETLANDS CONTRUÍDOS OPERANDO COMO UNIDADES DE POLIMENTO DE EFLUENTES DE REATORES UASB

    Directory of Open Access Journals (Sweden)

    Luciano Matos Queiroz

    2014-08-01

    Full Text Available O presente trabalho objetivou a realização de uma análise crítica sobre a aplicação de wetlands construídoscomo unidades de polimento de efluentes de reatores UASB (Upflow Anaerobic Sludge Blanket Reactors.O estudo foi realizado a partir de informações e dados obtidos por meio de trabalhos técnicos e científicospublicados entre os anos de 2000 e 2009, os quais estudaram a capacidade de degradação da matériaorgânica e o grau de remoção de nutrientes em sistemas de wetlands construídos exclusivamente paraessa finalidade. Foi realizada uma análise estatística relacionando cada um dos parâmetros chave adotadosnos projetos dos sistemas (taxas de aplicação superficial, tipos de substrato e macrófitas com a eficiênciade remoção de poluentes. As técnicas utilizadas para verificação da correlação entre as variáveis estudadasforam a estatística descritiva e análise de regressão linear multivariada. Todos os dados foram tratados emnível de significância de 95%. Os resultados permitiram concluir que, de maneira geral, os sistemas dewetlands construídos estudados apresentaram valores médios de eficiência de remoção de 78,3%, 54,4% e66,9% para matéria orgânica, medida como DQO, Nitrogênio Total Kjedhal (NTK e fósforo (P,respectivamente. O excelente desempenho da tecnologia para remoção de DQO foi ratificado pelo teste dehipótese. Os resultados mostram que o tipo de substrato utilizado (areia e brita não é significativo para aobtenção de elevadas eficiências e remoção de poluentes nos sistemas; por outro lado, o tipo de macrófitautilizado mostrou-se relevante para a remoção de NTK e P.

  15. Imaging findings and cerebral perfusion in arterial ischemic stroke due to transient cerebral arteriopathy in children; Achados de imagem e perfusao arterial cerebral em acidente vascular cerebral isquemico devido a arteriopatia transitoria em crianca

    Energy Technology Data Exchange (ETDEWEB)

    Barbosa Junior, Alcino Alves, E-mail: alcinojr@uol.com.br [Departamento de Diagnostico por Imagem, Hospital Israelita Albert Einstein - HIAE, Sao Paulo, SP (Brazil); Ellovitch, Saada Resende de Souza [Neuropediatria, Hospital Israelita Albert Einstein - HIAE, Sao Paulo, SP (Brazil); Pincerato, Rita de Cassia Maciel [Hospital Samaritano, Sao Paulo, SP (Brazil)

    2012-04-15

    We report the case of a 4-year-old female child who developed an arterial ischemic stroke in the left middle cerebral artery territory, due to a proximal stenosis of the supraclinoid internal carotid artery, most probably related to transient cerebral arteriopathy of childhood. Computed tomography scan, magnetic resonance imaging, perfusion magnetic resonance and magnetic resonance angiography are presented, as well as follow-up by magnetic resonance and magnetic resonance angiography exams. Changes in cerebral perfusion and diffusion-perfusion mismatch call attention. As far as we know, this is the first report of magnetic resonance perfusion findings in transient cerebral arteriopathy. (author)

  16. Uso de leitos cultivados de fluxo vertical por batelada no pós-tratamento de efluente de reator anaeróbio compartimentado Post-treatment of effluent of anaerobic baffled reactor using batchwise vertical flow constructed wetland beds

    Directory of Open Access Journals (Sweden)

    Marcelo Mazzola

    2005-06-01

    Full Text Available Neste trabalho avaliou-se o desempenho de um Reator Anaeróbio Compartimentado (RAC de duas câmaras em série, seguido de três leitos cultivados (constructed wetlands de fluxo vertical por batelada. A unidade experimental, em escala piloto, foi instalada na Faculdade de Engenharia Agrícola - UNICAMP, Campinas, SP, Brasil. O volume total do reator era de 2,3 m³ (TDH de 12 h. O efluente do RAC foi tratado em três leitos, dois cultivados com macrófitas (gêneros Typha sp. e Eleocharis sp. e um utilizado como controle (não cultivado. Os leitos, com 2,0 m³ cada um e brita #2 (24 - 35 mm como meio suporte, operaram com fluxo vertical por batelada (com tempos de reação de 24, 48, 72 e 96 h. Na avaliação do RAC, observou-se tendência de estabilização dos parâmetros pH, alcalinidade, ácidos voláteis, sólidos sedimentáveis e suspensos totais, porém a remoção de DQO revelou-se limitada (50%. Nos leitos cultivados o aumento do tempo de reação (até 72 h foi acompanhado pelo aumento de remoção de turbidez, DQO, fósforo e nitrato. O melhor desempenho de remoção de fósforo total foi obtido no leito vegetado com Typha sp para os tempos de 72 e 96 h, respectivamente, de 30 e 25%.This study evaluated the performance of vertical constructed wetlands treating effluent of anaerobic baffled reactor. The anaerobic reactor volume was 2.3 m³; it was operated with daily flow of 4.6 m³ (12 hours Hydraulic Retention Time. The reactor effluent was split into three wetlands beds, two of them cultivated with macrophytes (Typha sp. and Eleocharis sp., and one control. The wetlands were operated as a batch reactor. The medium utilized was gravel, the size ranging from 7 to 12 mm. The reaction time for each cycle (filling - reaction - drainage was 24, 48, 72, and 96 h. The anaerobic reactor achieved the following removal rates: settable solids, 93%; suspended solids, 80%; and COD 39%. The increase in reaction time (up to 72 h for the constructed

  17. Avaliação de desempenho de lagoa de polimento para pós-tratamento de reator anaeróbio de manta de lodo (UASB no tratamento de águas residuárias de suinocultura Evaluation of the performance of a polishing pond for the post-treatment of the effluent from an upflow anaerobic sludge blanket (UASB reactor treating swine wastewater

    Directory of Open Access Journals (Sweden)

    L.S. Rodrigues

    2009-12-01

    Full Text Available Avaliou-se o desempenho de uma lagoa de polimento, no tratamento de efluentes de águas residuárias de suinocultura de um reator anaeróbio de manta de lodo (UASB. O sistema foi composto de decantador, reator UASB, em escala real, e lagoa de polimento em escala experimental. As análises físico-químicas realizadas foram: temperatura, pH, demanda bioquímica de oxigênio (DBO, demanda química de oxigênio (DQO, sólidos suspensos totais (SST e sólidos suspensos voláteis (SSV, nitrogênio total kjedhal (NTK, nitrogênio amoniacal (N-am. e orgânico (N-org., fósforo total (Pt, coliformes totais e termotolerantes. A lagoa de polimento apresentou alto desempenho, com remoção média de 58,9% de DBO, 60,1% de NTK, 57% de N-am. e 95,34% de coliformes termotolerantes.The performance of a polishing pond for treating swine wastewater from an upflow anaerobic sludge blanket (UASB reactor was evaluated. The system was assembled with a slat settler, followed by an UASB reactor, on a real scale, and a post-treatment pond, on a demonstration scale. The following parameters were analyzed: temperature, pH, biochemical oxygen demand (BOD, chemical oxygen demand (COD, total suspended solids (TSS, volatile suspended solids (VSS, total Kjedahl nitrogen (NTK, ammonia nitrogen (N-am., organic nitrogen, total phosphorus, and total and thermotolerant coliforms. The polishing pond was highly efficient, removing an average of 58.9% of BOD, 60.1% of NTK, 57% of N-am., and 95.34% of thermotolerant coliforms.

  18. Transient bilateral diabetic cataracts in a Brazilian Terrier puppy Catarata diabética transitória bilateral em um filhote de Terrier Brasileiro

    Directory of Open Access Journals (Sweden)

    Carla de Freitas Campos

    2005-06-01

    Full Text Available A case of a Brazilian Terrier puppy presenting diabetic lens opacity that restored transparency after insulin therapy and control of blood glucose levels is reported. This entity has been rarely reported in human beings and has not been reported in dogs before. The rapid glycemic control may have been responsible for the transparency recovery.Relata-se o caso de um cão jovem, terrier brasileiro, apresentando opacidade lenticular diabética bilateral, a qual regrediu, sendo reassumida a transparência do cristalino após a terapia com insulina e controle dos níveis glicêmicos. Essa afecção tem sido reportada raramente em indivíduos da espécie humana, mas não há relatos de sua ocorrência em cães. O rápido controle glicêmico pode ter sido o responsável pela recuperação da transparência.

  19. Lodo em lagoas de polimento: acúmulo e implicações no comportamento hidrodinâmico e no desempenho do sistema

    OpenAIRE

    Thiago Emanuel Possmoser Figueiredo Nascimento

    2014-01-01

    Lagoas de polimento são uma tecnologia com grande potencial de aplicação em países em desenvolvimento por se tratarem de unidades que combinam o tratamento aeróbio a um tratamento anaeróbio eficiente (reator UASB). Essa combinação possibilita a redução de área comparado a sistemas de lagoas facultativas e controle de emanação de odores quando comparado a sistemas que empregam lagoas anaeróbias, mantendo a eficiência e certa simplicidade. Por outro lado, é inerente a esses sistemas o acúmulo d...

  20. Frequency-dependent friction and its significance for liquid pipeline simulation; Influencia do fator de atrito com dependencia da frequencia na simulacao de transientes em oleodutos

    Energy Technology Data Exchange (ETDEWEB)

    Tepedino, Alexandre F. [TRANSPETRO - PETROBRAS Transporte S.A., Rio de Janeiro, RJ (Brazil); Rachid, Felipe B. Freitas [Universidade Federal Fluminense (UFF), Niteroi, RJ (Brazil). Programa de Pos-Graduacao em Engenharia Mecanica. Lab. de Transporte de Liquidos e Gases

    2008-07-01

    Unsteady liquid flow in pipelines is usually described by using one-dimensional models and, in a procedure referred to as quasi-steady approximation, friction losses are estimated by formulae derived for steady state flow conditions. The assumption is that the friction loss during transient flow conditions can be approximated by the friction loss obtained for a steady flow with the same average velocity. However, during unsteady flow conditions the velocity profile can be considerably different from the steady flow. The shear stress at the pipe wall and the mean velocity are not in phase. Therefore, friction losses computed according to the quasi-steady approximation are inaccurate. To overcome this, the concept of frequency-dependent friction was proposed, including the time history of the mean flow velocity and acceleration, resulting in better correlation to experimental data. This work presents an investigation of situations in which the use of a frequency-dependent friction model could bring additional improvement for the petroleum and products pipeline simulation. To do so, through computer simulations, the predictions of both quasi-steady and unsteady friction models, for short and long lines, operating under a range of Reynolds numbers, are compared and the significance of the friction model is evaluated. (author)

  1. Diesel quality improvement through hydrotreatment reactor modifications; Melhorias na qualidade de diesel atraves de modificacoes em reator de hidrotratamento

    Energy Technology Data Exchange (ETDEWEB)

    Fernandes, Nelmo F.; Machado, Silvio J. [PETROBRAS, Rio de Janeiro, RJ (Brazil)

    2004-07-01

    The distribution of flow for the catalytic bed is directly responsible for the efficiency of the withdrawal of nitrogen- (N-) and sulfur (S-) compounds presented in petroleum feedstocks. With the arrangement of proportionate flow for the original project, occurred bad distribution of gas flow and liquid through the catalytic bed and low efficiency of removal of sulphur and nitrogen. The new distributor tray provides a flow of high dispersion and a total use of the catalytic bed allowing a bigger shipment of catalyst. With the best distribution of flow and greater amount of catalyst, the increase of the proportionate efficiency allows to reach minors concentrations of sulphur and nitrogen in diesel, remaining the same operational conditions of original temperature and pressure of the unit. These conclusions had been corroborated by determination of the flow of liquid in the catalytic bed of the reactor, looking at the distribution pattern of radiotracer through the reactor bed before and after the installation of the new distributor tray. The distribution of radiotracer through the packed bed is the best possible representation of the liquid traffic distribution in a hydrotreater bed. Another important profit with the new distributor tray was the increase of the processing of diesel. (author)

  2. Current interruption transients calculation

    CERN Document Server

    Peelo, David F

    2014-01-01

    Provides an original, detailed and practical description of current interruption transients, origins, and the circuits involved, and how they can be calculated Current Interruption Transients Calculationis a comprehensive resource for the understanding, calculation and analysis of the transient recovery voltages (TRVs) and related re-ignition or re-striking transients associated with fault current interruption and the switching of inductive and capacitive load currents in circuits. This book provides an original, detailed and practical description of current interruption transients, origins,

  3. Influência da recirculação de percolado em sistemas de batelada de uma fase e híbrido na digestão da fração orgânica de resíduos sólidos urbanos

    OpenAIRE

    Aurélio Pessôa Picanço

    2004-01-01

    Nesta tese foi estudada a influência da recirculação do percolado, ajustando as melhores taxas e freqüências, para degradação da fração orgânica dos resíduos sólidos urbanos, em sistema de batelada de uma e duas fases (híbrido). Foram utilizados reatores de 3,45 litros preenchidos com resíduo sólido urbano padrão (FORSUp), percolado como inóculo e um filtro anaeróbio como reator metanogênico. Foram testadas as taxas de recirculação do inóculo de 1%, 2,5%, 5%, 10%, 20%, 30% e 50% e seu monitor...

  4. Duas epidemias de tuberculose em crianças menores de três anos de idade, vacinadas com BCG oral, numa creche do município de São Paulo, Brasil Two epidemics of tuberculosis in children under three years of age vaccinated with oral BCG in a day-nursery in S. Paulo county, Brazil

    Directory of Open Access Journals (Sweden)

    Roberto Brólio

    1974-09-01

    Full Text Available São descritas duas epidemias de tuberculose em crianças menores de 3 anos de idade vacinadas com BCG oral, ocorridas numa creche para crianças menores de 5 anos de idade, no município de São Paulo, nos anos de 1967 e 1969. Em 1967 havia no estabelecimento 96 crianças, inicialmente não reatoras ao teste tuberculínico padronizado (PPD, Rt-23, 2 UT. Foram encontrados 19 reatores, sendo 12 reatores fortes (63,2% e 7 reatores fracos (36,8% e imagens radiológicas indicativas de anormalidade pulmonar em 15 crianças ou 78,9% dos reatores. Em 1969 havia no estabelecimento mais 62 crianças não reatoras, que foram acompanhadas separadamente em relação ao grupo de 1967, embora convivessem no mesmo ambiente. Foram encontrados 36 reatores à tuberculina, sendo 29 reatores fortes (80,5% e 7 reatores fracos (19,5% e imagens radiológicas indicativas de anormalidade pulmonar em 11 crianças, ou 30,5% dos reatores. Nesse mesmo ano houve viragem tuberculínica em mais 7 crianças pertencentes ao grupo de não reatores de 1967, sendo 5 reatores fortes e 2 reatores fracos. Nas duas epidemias, as viragens tuberculínicas e as alterações radiológicas pulmonares foram constatadas apenas nas crianças menores de 3 anos de idade, em sua maioria vacinadas previamente com 3 doses de BCG oral, com intervalo de uma semana entre uma dose e outra. A fonte de infecção foi um operário que trabalhou no estabelecimento durante aproximadamente dois meses em 1967 e um mês em 1969, nos locais onde eram mantidas as crianças menores de 3 anos de idade. A vacina administrada por esse método não parece ter influenciado nas conversões tuberculínicas e no desenvolvimento de imunidade específica.Two epidemics of tuberculosis in children under three years of age vaccinated with oral BCG, in the year of 1967 and 1969, in a day-nursery in S. Paulo borough, are here described. In 1967 there were 96 children in the place, at first non-reactors, to the standard

  5. PSH Transient Simulation Modeling

    Energy Technology Data Exchange (ETDEWEB)

    Muljadi, Eduard [National Renewable Energy Laboratory (NREL), Golden, CO (United States)

    2017-12-21

    PSH Transient Simulation Modeling presentation from the WPTO FY14 - FY16 Peer Review. Transient effects are an important consideration when designing a PSH system, yet numerical techniques for hydraulic transient analysis still need improvements for adjustable-speed (AS) reversible pump-turbine applications.

  6. Resolução de um modelo de reator de leito fixo não adiabático com dispersão axial utilizando redes neurais artificiais - DOI: 10.4025/actascitechnol.v25i1.2238

    Directory of Open Access Journals (Sweden)

    Luiz Henry Monken e Silva

    2003-04-01

    Full Text Available As capacidades de interpolação de redes perceptron multicamada (MLP foram utilizadas para resolver um sistema de equações diferencias ordinárias que modela um reator não-adiabático com leito fixo e dispersão axial. As metodologias descritas neste artigo seguem as propostas por Lagaris et al. (1998, 2000, estendidas para modelos com condições de contorno mistas e pelo uso do método da penalidade para converter o problema de otimização original de restrito para irrestrito no treinamento das redes MLP. Os resultados são compatíveis com aqueles apresentados em Luize e Biscaia (1991, que foram obtidos com técnicas numéricas já consagradas, como elementos finitos e colocação ortogonal. O método de neuro-interpolação adotado neste artigo é de fácil manuseio se comparado com os métodos clássicos para solução numérica de equações diferenciais, particularmente para sistemas diferenciais não-lineares, e define uma aproximação global, na forma analítica, para a solução de problemas.

  7. Potencial energético e alternativas para o aproveitamento do biogás e lodo de reatores UASB: estudo de caso Estação de tratamento de efluentes Laboreaux (Itabira

    Directory of Open Access Journals (Sweden)

    André Pereira Rosa

    Full Text Available RESUMO: Este trabalho estuda o potencial de aproveitamento energético dos subprodutos biogás e lodo gerados na estação de tratamento de efluentes (ETE Laboreaux em Itabira (MG, composta de reatores UASB, filtros biológicos percoladores e unidade de desaguamento do lodo por filtro prensa. Os subprodutos biogás e lodo foram caracterizados em termos quantitativos (produção e qualitativos (composição e poder calorífico durante 12 meses de monitoramento. Foram estudados dois cenários de aproveitamento energético dos subprodutos: (i uso prioritário do biogás para a secagem térmica do lodo e o excedente de biogás para geração de eletricidade em motor de combustão interna; e (ii uso prioritário do biogás visando à geração de eletricidade e ao aproveitamento do calor dos gases de exaustão para a secagem térmica de lodo. Para a análise desses cenários, utilizou-se o software CHEMCAD(r a fim de determinar as condições de queima do biogás em câmara de combustão e em motor de combustão interna, assim como na determinação dos balanços de massa e energia. O estudo analisou o potencial de aproveitamento dos subprodutos do tratamento como fonte de energia renovável para uso na própria ETE e para fornecimento a terceiros. No cenário 1, a geração de eletricidade é menor (atendendo 22,2% da demanda de energia da ETE, mas a secagem térmica possibilita maior redução no volume final de lodo a ser disposto ou a eliminação completa de disposição final se o lodo seco final (com 10% de umidade for utilizado como combustível por terceiros. No cenário 2, a geração de eletricidade é capaz de suprir 57,6% da demanda de energia da ETE, todavia o calor contido nos gases de exaustão não é suficiente para a secagem de todo o lodo desaguado, configurando uma menor redução na quantidade de lodo a ser disposto (13,5 ou 24,9% de redução em massa, conforme a alternativa de remoção de umidade selecionada.

  8. Avaliação do potencial de produção de biogás e da eficiência de tratamento do reator anaeróbio de manta de lodo (UASB alimentado com dejetos de suínos Potential evaluation of biogas production and treatment efficiency of an upflow anaerobic sludge blanket (UASB fed with swine manure liquid effluent

    Directory of Open Access Journals (Sweden)

    Cláudio Milton Montenegro Campos

    2005-08-01

    Full Text Available Com o presente trabalho de pesquisa objetivou-se avaliar a eficiência na remoção de poluentes orgânicos e a produção de biogás de um sistema de tratamento de efluentes de dejetos de suínos em escala laboratorial (bancada. A pesquisa foi desenvolvida no Laboratório de Análise de Água do Departamento de Engenharia (LAADEG da Universidade Federal de Lavras (UFLA. O sistema de tratamento foi constituído por um Tanque de Acidificação e Equalização (TAE, Reator Anaeróbio de Manta de Lodo (UASB com medidor de biogás (gasômetro e uma Lagoa Aerada Facultativa (LAF. A alimentação foi realizada em bateladas no TAE, onde o efluente líquido era bombeado para um sistema de aquecimento sendo então introduzido no reator UASB e finalmente conduzido para polimento na LAF. O biogás acumulado na parte superior do UASB, após passar por um equalizador de pressão, era canalizado e armazenado no gasômetro. O valor médio do Tempo de Detenção Hidráulica (TDH foi de 30 horas. Os valores médios de remoção da DQO T, DBO5, ST, STF e STV, foram: 1755, 670, 1089; 142 e 948 mg.L-1, respectivamente. As eficiências de remoção da DQO T e DBO5 no reator UASB foram de 78 e 75%, respectivamente. A produção média de biogás e metano (CH4 foi de 0,14 e 0,10 L.d-1. O potencial de produção de CH4 em termos de DBO5 removida foi de 0,01 m³CH4.(kg.DBO removida -1. O sistema apresentou boa eficiência quanto a remoção de DQO T, DBO5 e Sólidos.The present research aimed at evaluating in lab-scale system the removal of pollutants and biogas production efficiency in treating a swine liquid effluent. The research was carried out in the Laboratory of Water Analysis from the Engineering Department of Federal University of Lavras (LAADEG. The system parts built up were: Acidification Equalization Tank (AET, an Upflow Anaerobic Sludge Blanket reactor (UASB with biogas measurement and an Aerated Facultative Pond (AFP. The batch feeding process was carried

  9. AVALIAÇÃO DA SEDIMENTABILIDADE DE BIOMASSA GRANULAR E FLOCULENTA EM SISTEMAS DE LODO ATIVADO

    Directory of Open Access Journals (Sweden)

    Jéssyca de Freitas Lima

    2014-07-01

    Full Text Available A sedimentação é uma importante operação unitária no tratamento de esgotos, pois pode definir o desenvolvimento de projetos mais econômicos. A pesquisa visou avaliar a sedimentabilidade de biomassa aeróbia granular e floculenta. Foram montados dois sistemas de lodo ativado, um sistema University of Cape Town - UCT com características de lodo floculento e um reator em bateladas sequenciais com estratégias para a granulação aeróbia - RBSG. Com os resultados obtidos foi possível afirmar que o lodo granular obteve uma velocidade de sedimentação elevada (35 m/h, sendo superior à velocidade considerada ideal pela literatura especializada (faixa de 6 a 10 m/h. Já o sistema UCT teve uma média de 7,9 m/h. Foi confirmado que o lodo granular do reator intermitente além da vantagem de maior acúmulo de sólidos no sistema e menor espaço construtivo, também é capaz de tratar mais esgoto por unidade de tempo quando comparado ao sistema contínuo com lodo floculento (UCT. Isso faz com que a escolha por sistemas granulares aeróbios se torne cada vez mais atrativa para o tratamento de efluentes de diferentes naturezas.

  10. Simulação numérica da dispersão do sulfeto de hidrogênio emitido por um reator UASB para tratamento de esgoto doméstico

    Directory of Open Access Journals (Sweden)

    Matheus Ribeiro Augusto

    2017-03-01

    Full Text Available O tratamento anaeróbio de águas residuárias pode produzir elevadas concentrações de sulfeto de hidrogênio (H2S, substância que apresenta forte odor, além de ser corrosivo e tóxico. Alguns dos métodos existentes para o controle do H2S demandam elevado custo de implantação e operação e, portanto, não são adotados. Dessa forma, o planejamento adequado da instalação de uma estação de tratamento de esgoto (ETE pode auxiliar na prevenção do impacto e de possíveis problemas com a população. Modelos matemáticos de dispersão atmosférica podem ser aplicados previamente para verificar o alcance do poluente e, portanto, subsidiar a definição do local mais adequado para instalação de uma ETE. Dessa forma, o objetivo deste trabalho foi analisar a dispersão atmosférica do H2S proveniente de uma unidade anaeróbia de tratamento de águas residuárias localizada em um bairro rural do município de Itajubá, MG, Brasil. Para isso, foi aplicado o modelo gaussiano AERMOD utilizando-se dados reais da taxa de emissão do poluente no reator anaeróbio, além de informações meteorológicas e geofísicas (relevo e uso do solo. Como resultado das simulações verificou-se que a pluma de odor foi orientada pelo relevo e se concentrou nas proximidades da unidade de tratamento, limitando o impacto ao bairro rural. O vento também exerceu influência direta na orientação do H2S para o período 1. No entanto, para o período 2, não se verificou a mesma tendência. Dessa maneira, constatou-se que a análise de características meteorológicas (principalmente a direção predominante dos ventos e geofísicas da região e a aplicação de modelos matemáticos podem auxiliar na escolha do local mais adequado para a instalação de uma ETE.

  11. Reactors licensing: proposal of an integrated quality and environment regulatory structure for nuclear research reactors in Brazil; Licenciamento de reatores: proposta de uma estrutura regulatoria integrada com abordagem em qualidade e meio ambiente para reatores de pesquisa no Brasil

    Energy Technology Data Exchange (ETDEWEB)

    Serra, Reynaldo Cavalcanti

    2014-07-01

    A new integrated regulatory structure based on quality and integrated issues has been proposed to be implemented on the licensing process of nuclear research reactors in Brazil. The study starts with a literature review about the licensing process in several countries, all of them members of the International Atomic Energy Agency. After this phase it is performed a comparative study with the Brazilian licensing process to identify good practices (positive aspects), the gaps on it and to propose an approach of an integrated quality and environmental management system, in order to contribute with a new licensing process scheme in Brazil. The literature review considered the following research nuclear reactors: Jules-Horowitz and OSIRIS (France), Hanaro (Korea), Maples 1 and 2 (Canada), OPAL (Australia), Pallas (Holand), ETRR-2 (Egypt) and IEA-R1 (Brazil). The current nuclear research reactors licensing process in Brazil is conducted by two regulatory bodies: the Brazilian National Nuclear Energy Commission (CNEN) and the Brazilian Institute of Environment and Renewable Natural Resources (IBAMA). CNEN is responsible by nuclear issues, while IBAMA by environmental one. To support the study it was applied a questionnaire and interviews based on the current regulatory structure to four nuclear research reactors in Brazil. Nowadays, the nuclear research reactor’s licensing process, in Brazil, has six phases and the environmental licensing process has three phases. A correlation study among these phases leads to a proposal of a new quality and environmental integrated licensing structure with four harmonized phases, hence reducing potential delays in this process. (author)

  12. Spectroscopic classification of transients

    DEFF Research Database (Denmark)

    Stritzinger, M. D.; Fraser, M.; Hummelmose, N. N.

    2017-01-01

    We report the spectroscopic classification of several transients based on observations taken with the Nordic Optical Telescope (NOT) equipped with ALFOSC, over the nights 23-25 August 2017.......We report the spectroscopic classification of several transients based on observations taken with the Nordic Optical Telescope (NOT) equipped with ALFOSC, over the nights 23-25 August 2017....

  13. Fluid dynamic transient analysis

    International Nuclear Information System (INIS)

    Vilhena Reigosa, R. de

    1992-01-01

    This paper describes the methodology adopted at NUCLEN for the fluid dynamic analyses for ANGRA 2. The fluid dynamic analysis allows, through computer codes to simulate and quantify the loads resulting from fluid dynamic transients caused by postulated ruptures or operational transients, in the piping of the safety systems and of the important operational systems. (author)

  14. Nuclear reactors project optimization based on neural network and genetic algorithm; Otimizacao em projetos de reatores nucleares baseada em rede neural e algoritmo genetico

    Energy Technology Data Exchange (ETDEWEB)

    Pereira, Claudio M.N.A. [Instituto de Engenharia Nuclear (IEN), Rio de Janeiro, RJ (Brazil); Schirru, Roberto; Martinez, Aquilino S. [Universidade Federal, Rio de Janeiro, RJ (Brazil). Coordenacao dos Programas de Pos-graduacao de Engenharia

    1997-12-01

    This work presents a prototype of a system for nuclear reactor core design optimization based on genetic algorithms and artificial neural networks. A neural network is modeled and trained in order to predict the flux and the neutron multiplication factor values based in the enrichment, network pitch and cladding thickness, with average error less than 2%. The values predicted by the neural network are used by a genetic algorithm in this heuristic search, guided by an objective function that rewards the high flux values and penalizes multiplication factors far from the required value. Associating the quick prediction - that may substitute the reactor physics calculation code - with the global optimization capacity of the genetic algorithm, it was obtained a quick and effective system for nuclear reactor core design optimization. (author). 11 refs., 8 figs., 3 tabs.

  15. IEA-R1 reactor spent fuel element surveillance; Acompanhamento da irradiacao dos elementos combustiveis do reator IEA-R1

    Energy Technology Data Exchange (ETDEWEB)

    Damy, Margaret de Almeida; Terremoto, Luis Antonio Albiac; Silva, Jose Eduardo Rosa da; Silva, Antonio Teixeira e; Teodoro, Celso A.; Lucki, Georgi; Castanheira, Myrthes [Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil)]. E-mail: madamy@ipen.br

    2005-07-01

    The irradiation surveillance is an important part of a qualification program of the U{sub 3}O{sub 8}-Al and U{sub 3}Si{sub 2}-Al dispersion nuclear fuels manufactured in IPEN/CNEN-SP. This work presents the surveillance results regarding the fuel and control elements irradiated in the IEA-R1 research reactor during the period from June/1999 until December/2003, which embraced register of visual inspections, irradiation conditions, burn-up calculations, thermal hydraulic parameters and failure occurrences. Also providing information that helps the safe operation of the IEA-R1 research reactor, the irradiation surveillance is a collaboration work involving researchers of the Centro de Engenharia Nuclear (CEN) and the operators' staff of the Centro do Reator de Pesquisas (CRPq), both from IPEN/CNEN-SP. (author)

  16. Summary of transient management

    International Nuclear Information System (INIS)

    Sheron, B.W.

    1984-01-01

    This chapter reviews the papers on evaluating and managing transients, as given at the American Nuclear Society Topical Meeting on Anticipated and Abnormal Plant Transients in Light Water Reactors. Transient management involves both diverse and related areas such as analysis, systems performance, human performance, procedures, and training. State-of-the-art simulators are being improved to solve the constitutive equations for two-phase fluid flow by the development of a new generation of analysis codes which are simpler and faster than earlier codes. Both the US NRC and the nuclear industry are criticized for solving problems by adding additional requirements for the reactor operator rather than by recognizing design deficiencies

  17. Transient Ischemic Attack

    Medline Plus

    Full Text Available ... Ischemic Attack TIA , or transient ischemic attack, is a "mini stroke" that occurs when a blood clot blocks an artery for a short time. The only difference between a stroke ...

  18. Transient Ischemic Attack

    Medline Plus

    Full Text Available ... TIA , or transient ischemic attack, is a "mini stroke" that occurs when a blood clot blocks an ... a short time. The only difference between a stroke and TIA is that with TIA the blockage ...

  19. Remoção de matéria orgânica e sólidos suspensos por nova configuração de biofiltro aeróbio submerso no pós-tratamento de efluente de reator UASB Removal of organic matter and suspended solids by a new configuration of biological aerated filter in the post-treatment of UASB reactor effluent

    Directory of Open Access Journals (Sweden)

    Saulo Varela Della Giustina

    2010-09-01

    Full Text Available O pós-tratamento de efluentes de reatores anaeróbios é um processo necessário para o atendimento dos padrões de emissão. Os resultados aqui apresentados mostram a viabilidade de uso de uma nova configuração de biofiltro aeróbio submerso (BAS no pós-tratamento desses efluentes. Os BAS multiestágio apresentam uma câmara anaeróbia (V=12,6L, seguido de uma câmara aeróbia (V=30L e uma câmara anóxica (V=26,4L, todas em série (V total=70L. Neste estudo, foi analisada a remoção de sólidos suspensos (SS, DQO e DBO5. Foram utilizados três BAS multi-estágio preenchidos com três diferentes materiais-suporte: tampas e gargalos PET (165m²/m³, pedra britada n. 4 (50m²/m³ e anéis Pall 1,5'' (135m²/m³. Os reatores foram operados com valores de tempos de detenção hidráulicas (TDH de 4,1, 8,2 e 12,3 horas, e três taxas de aplicação superficial (TAS (21, 12 e 8m³/m².d. A associação dos reatores UASB+BAS possibilitou remoções de DQO total superiores a 90% para os BAS 1 e 3, e 85% para o BAS 2, sendo independente do TDH aplicado. A remoção de SS foi maior no BAS contendo anéis Pall, provavelmente devido ao maior índice de vazios desse material.The post-treatment of effluents from anaerobic reactors is normally a mandatory step to meet the emission standards. The results presented here show the feasibility of using a new configuration of biological aerated filter (BAF in the post-treatment of UASB reactors. The multi-stage BAF presents an anaerobic chamber (V=12.6L, followed by an aerobic chamber (V=30L and an anoxic chamber (V=26.4L, all in series (total V=70L. This study examined the removal of suspended solids (SS, COD and BOD5. Three multi-stage BAF filled with three different packing materials were used: lids and bottlenecks of PET bottles (165m²/m³, gravel n. 4 (50m²/m³ and Pall rings 1.5'' (135m²/m³. The reactors were operated with the values of hydraulic detention time (HDT of 4.1, 8.2 and 12.3 hours, and

  20. Inquérito com paracoccidioidina em uma população da Bahia (Brasil

    Directory of Open Access Journals (Sweden)

    Jacy Amaral F. de Andrade

    1984-02-01

    Full Text Available No Município de Una, localizado ao Sul do Estado da Bahia, em área com registro freqüente de casos de leishmaniose tegumentar, foram estudados 177 indivíduos, na faixa etária entre três meses e 73 anos, através de provas intradérmicas com paracoccidioidina (antígeno péptido-polissacarídico do Paracoccidioides brasiliensis. Positividade foi obtida em dez indivíduos (5,6%. Somente foi considerada positiva a reação que apresentava enduração igual ou maior que 5 mm. Em nenhum dos casos positivos à paracoccidioidina havia evidência clínica de lesões blastomicóticas. Com os soros dos indivíduos positivos à paracoccidioidina, foram realizadas provas de imunodifusão dupla e contraimunoeletroforese, com resultados negativos para anticorpos circulantes anti-P. brasiliensis. Este dado indica que, em nenhum dos reatores à paracoccidioidina, havia processo infeccioso em atividade. O percentual de positividade obtido com a paracoccidioidina, em que pesem eventuais reações cruzadas com histoplasmose, sugere a ocorrência da paracoccidioidomicose na área estudada.

  1. Physical-chemical and operational performance of an anaerobic baffled reactor (ABR treating swine wastewater = Desempenho físico-químico e operacional de um reator anaeróbio compartimentado (RAC como tratamento biológico preliminar de efluentes de suinocultura

    Directory of Open Access Journals (Sweden)

    Erlon Lopes Pereira

    2010-10-01

    Full Text Available Since hog raising concentrates a huge amount of swine manure in smallareas, it is considered by the environmental government organizations to be one of the most potentially pollutant activities. Therefore the main objective of this research was to evaluate by operational criteria and removal efficiency, the performance of a Anaerobic Baffled Reactor (ABR, working as a biological pre-treatment of swine culture effluents. The physical-chemical analyses carried out were: total COD, BOD5, total solids (TS, fix (TFS and volatiles (TVS, temperature, pH, total Kjeldahl nitrogen, phosphorus, total acidity and alkalinity. The ABR unit worked with an average efficiency of 65.2 and 76.2%, respectively, concerning total COD and BOD5, with a hydraulic retention time (HRT about 15 hours. The results for volumetric organic loading rate (VOLR, organic loading rate (OLR andhydraulic loading rate (HLR were: 4.46 kg BOD m-3 day-1; 1.81 kg BOD5 kg TVS-1 day-1 and 1.57 m3 m-3 day-1, respectively. The average efficiency of the whole treatment system for total COD and BOD5 removal were 66.5 and 77.8%, showing an adequate performancein removing the organic matter from swine wastewater.A suinocultura por ser uma atividade pecuária concentradora de dejetos em pequenas áreas é considerada, pelos órgãos de gerência ambiental, como uma das atividades mais degradadoras do meio ambiente. Nesta pesquisa objetivou-se, por conseguinte, avaliar a utilização de um reator anaeróbio compartimentado (RAC, como unidade de prétratamento de um reator tipo UASB, em escala piloto, na adequação ambiental dos efluentes de suinocultura, avaliando critérios operacionais e a eficiência. As análises físico-químicasrealizadas foram: DQOtotal, DBO5, sólidos totais (ST, fixos (SF e voláteis (SV, temperatura, pH, nitrogênio total Kjeldahl, fósforo, acidez total e alcalinidade. A unidade RAC trabalhou com eficiência de 65,2 e 76,2% para a remoção de DQOtotal e DBO5

  2. Start-up of horizontal anaerobic reactors with sludge blanket and fixed bed for wastewater treatment from coffee processing by wet method Partida de reatores anaeróbios horizontais com manta de lodo e de leito fixo para tratamento de águas residuárias do beneficiamento de frutos do cafeeiro por via úmida

    Directory of Open Access Journals (Sweden)

    Roberto A. de Oliveira

    2013-04-01

    Full Text Available In this study it was evaluated the start-up procedures of anaerobic treatment system with three horizontal anaerobic reactors (R1, R2 and R3, installed in series, with volume of 1.2 L each. R1 had sludge blanket, and R2 and R3 had half supporter of bamboo and coconut fiber, respectively. As an affluent, it was synthesized wastewater from mechanical pulping of the coffee fruit by wet method, with a mean value of total chemical oxygen demand (CODtotal of 16,003 mg L-1. The hydraulic retention time (HRT in each reactor was 30 h. The volumetric organic loading (VOL applied in R1 varied from 8.9 to 25.0 g of CODtotal (L d-1. The mean removal efficiencies of CODtotal varied from 43 to 97% in the treatment system (R1+R2+R3, stabilizing above 80% after 30 days of operation. The mean content of methane in the biogas were of 70 to 76%, the mean volumetric production was 1.7 L CH4 (L reactor d-1 in the system, and the higher conversions were around at 0.20 L CH4 (g CODremoved-1 in R1 and R2. The mean values of pH in the effluents ranged from 6.8 to 8.3 and the mean values of total volatile acids remained below 200 mg L-1 in the effluent of R3. The concentrations of total phenols of the affluent ranged from 45 to 278 mg L-1, and the mean removal efficiency was of 52%. The start-up of the anaerobic treatment system occurred after 30 days of operation as a result of inoculation with anaerobic sludge with active microbiota.Foram avaliados os procedimentos de partida de sistema de tratamento com três reatores anaeróbios horizontais (R1, R2 e R3, instalados em série, com volume de 1,2 L cada. O R1 com manta de lodo e o R2 e R3 através de suporte de bambu e fibra de coco, respectivamente. Como afluente,foram sintetizadas águas residuárias do despolpamento mecânico dos frutos do cafeeiro por via úmida, com valor médio de demanda química de oxigênio total (DQOtotal de 16.003 mg L-1. O tempo de detenção hidráulica (TDH em cada reator foi de 30 h. As

  3. Análise da biodegradação dos componentes do óleo cítrico por CG/EM e análise da população microbiana de um reator de lodo ativado no tratamento de água residuária de uma indústria cítrica Analysis of biodegradation of citric oil compounds by GC/MSD and analysis of the microbial population of an activated sludge reactor in the treatment of a citric wastewater

    Directory of Open Access Journals (Sweden)

    Alexandre Nunes Ponezi

    2005-12-01

    Full Text Available Água residuária da indústria cítrica foi utilizada como objeto de estudo de biodegradação através de um sistema de lodo ativado por batelada. As análises realizadas por CG/EM mostraram que os compostos provenientes do óleo de laranja como o limoneno, foram resistentes a biodegradação. A avaliação microbiológica realizada no decorrer do período mostrou que o número e tipo de colônias bacterianas variaram de acordo com o tempo, e pode ser observada uma sucessão de microrganismos durante a biodegradação do efluente cítrico. O microrganismo identificado como LAB-9 (Pseudomonas struzieri e LAB-7 (não identificado prevaleceram durante todo o processo, sugerindo que estes são organismos importantes para remoção da matéria orgânica no processo ou são melhores adaptados ao tipo de água residuária. O sistema de lodo ativado foi eficiente na redução de DBO e DQO, alcançando valores de 79 e 78% respectivamente, num período de 15 h de reação, com uma relação F/M 4:2.Wastewater from citric industry was used to biodegradation study through an activated sludge system. The analyses accomplished by CG/MSD showed that compounds of the orange oil as the limoneno, was resistant to biodegradation. The microbiological evaluation developed during the biodegradation period showed that the number and type of bacteria present in the system varied according to the time, and a succession of microorganisms can be observed. The microrganism identified as LAB-9 (Pseudomonas struzieri and LAB-7 (not identified prevailed during whole the process, suggesting that they were the main responsible for the removal of the organic matter or the better adapted to the type of wastewater. The system of activated sludge was efficient in the reduction of DBO and DQO, reaching values of 79 and 78%, respectively, in a period of 15 h, with a relationship F/M 4:2.

  4. Transient Heat Conduction

    DEFF Research Database (Denmark)

    Rode, Carsten

    1998-01-01

    Analytical theory of transient heat conduction.Fourier's law. General heat conducation equation. Thermal diffusivity. Biot and Fourier numbers. Lumped analysis and time constant. Semi-infinite body: fixed surface temperature, convective heat transfer at the surface, or constant surface heat flux...

  5. Compressive Transient Imaging

    KAUST Repository

    Sun, Qilin

    2017-04-01

    High resolution transient/3D imaging technology is of high interest in both scientific research and commercial application. Nowadays, all of the transient imaging methods suffer from low resolution or time consuming mechanical scanning. We proposed a new method based on TCSPC and Compressive Sensing to achieve a high resolution transient imaging with a several seconds capturing process. Picosecond laser sends a serious of equal interval pulse while synchronized SPAD camera\\'s detecting gate window has a precise phase delay at each cycle. After capturing enough points, we are able to make up a whole signal. By inserting a DMD device into the system, we are able to modulate all the frames of data using binary random patterns to reconstruct a super resolution transient/3D image later. Because the low fill factor of SPAD sensor will make a compressive sensing scenario ill-conditioned, We designed and fabricated a diffractive microlens array. We proposed a new CS reconstruction algorithm which is able to denoise at the same time for the measurements suffering from Poisson noise. Instead of a single SPAD senor, we chose a SPAD array because it can drastically reduce the requirement for the number of measurements and its reconstruction time. Further more, it not easy to reconstruct a high resolution image with only one single sensor while for an array, it just needs to reconstruct small patches and a few measurements. In this thesis, we evaluated the reconstruction methods using both clean measurements and the version corrupted by Poisson noise. The results show how the integration over the layers influence the image quality and our algorithm works well while the measurements suffer from non-trival Poisson noise. It\\'s a breakthrough in the areas of both transient imaging and compressive sensing.

  6. Explosive and radio-selected Transients: Transient Astronomy with ...

    Indian Academy of Sciences (India)

    40

    SKA), large samples of explosive transients are expected to be discovered. Radio wavelengths, especially in commensal survey mode, are particularly well suited for uncovering the complex transient phenomena. This is because ob- servations ...

  7. Transient Astrophysics Probe

    Science.gov (United States)

    Camp, Jordan; Transient Astrophysics Probe Team

    2018-01-01

    The Transient Astrophysics Probe (TAP) is a wide-field multi-wavelength transient mission proposed for flight starting in the late 2020s. The mission instruments include unique “Lobster-eye” imaging soft X-ray optics that allow a ~1600 deg2 FoV; a high sensitivity, 1 deg2 FoV soft X-ray telescope; a 1 deg2 FoV Infrared telescope with bandpass 0.6-3 micron; and a set of 8 NaI gamma-ray detectors. TAP’s most exciting capability will be the observation of tens per year of X-ray and IR counterparts of GWs involving stellar mass black holes and neutron stars detected by LIGO/Virgo/KAGRA/LIGO-India, and possibly several per year X-ray counterparts of GWs from supermassive black holes, detected by LISA and Pulsar Timing Arrays. TAP will also discover hundreds of X-ray transients related to compact objects, including tidal disruption events, supernova shock breakouts, and Gamma-Ray Bursts from the epoch of reionization.

  8. Metastability of transient states

    Science.gov (United States)

    Rafailov, Michael K.

    2017-05-01

    High intensity ultrashort pulse causes dramatic perturbations in electronic structure of condensed matter. In the same time energy in high intensity single pulse may not be sufficient to disrupt sample thermal equilibrium. Interesting experimental results in ultrashort pulse photo-excited solids have been reported recently on transient athermal phenomena induced by ultrashort high intensity low energy pulse - phenomena related to both athermal phase transitions and athermal state changes. Athermal non-equilibrium of electronic system - and induced changes in magnetic and optical states, may exist only for a period of time comparable to excited carriers' relaxation time. That time is not sufficient for emerging application ranging from light induced superconductivity to infrared countermeasures. While single pulse interaction with condensed matter leading to transit state appearance is well observed, documented, and, to some extends, explained, one of the major problem is to maintain meta-stability of such transient states. Metastability of athermal non-equilibrium that could last well beyond electronic system relaxation time. The objective of this paper is to discuss some issues and approaches to meta-stability of transient states induced by ultrashort pulses in condensed matter.

  9. Transient or permanent fisheye views

    DEFF Research Database (Denmark)

    Jakobsen, Mikkel Rønne; Hornbæk, Kasper

    2012-01-01

    Transient use of information visualization may support specific tasks without permanently changing the user interface. Transient visualizations provide immediate and transient use of information visualization close to and in the context of the user’s focus of attention. Little is known, however, ...

  10. Prova tuberculínica, BCG oral e infecção tuberculosa em crianças menores de 5 anos Tuberculin test, oral BCG vaccine, and tuberculosis infection among children under five years of age

    Directory of Open Access Journals (Sweden)

    Marialda Höfling de Pádua Dias

    1978-12-01

    Full Text Available São relatados os resultados das provas tuberculínicas com PPD Rt23, 2 UT, em crianças menores de um ano e de um a 4 anos, matriculadas na Clínica Pediátrica do Hospital das Clínicas da Faculdade de Medicina da USP, São Paulo, Brasil, no período de 1971 a 1975. Em 665 crianças menores de um ano encontrou-se 3,15% de reatores fracos e 6,62% de reatores fortes e em 1.298 crianças de um a 4 anos, 0,69% de reatores fracos e 5,5% de reatores fortes. Nas mesmas crianças, foram estudadas as relações entre vacinação BCG oral prévia e positividade à prova tuberculínica nos 2 grupos etários considerados e nos quais se obteve a informação de vacinação anterior com BCG oral. Em 575 crianças menores de um ano e 1.113 de um a 4 anos encontrou-se associação positiva entre vacinação BCG oral prévia e positividade à prova tuberculínica. Analisando a relação entre o número de doses de BCG oral prévio e o resultado das provas tuberculínicas pelo método de Goodman, verificou-se que a proporção de crianças que tinham tomado 3 doses e mais de BCG oral e que apresentaram reação forte à prova tuberculínica é significantemente maior que a observada para os não reatores, fato esse não verificado para o grupo de um a 4 anos. Nas crianças que tomaram uma ou duas doses não foram encontradas diferenças estatisticamente significantes.Results of tuberculin reaction from PPD Rt 23, 2UT are reported on children under one year of age and children from one to four years of age who were registered in the Pediatric Clinics of the Hospital das Clinicas of the College of Medicine of the State University of São Paulo. The study was carried out from 1971 through 1975. In a group of 665 children under one year of age, 3.15% were weak reactors while 6.62% were strong reactors, and, in a group of 1298 children between one to four years of age, 0.69% were weak reactors while 5.5% were strong reactors. The relationship between prior BCG oral

  11. Familial Transient Global Amnesia

    Directory of Open Access Journals (Sweden)

    R.Rhys Davies

    2012-12-01

    Full Text Available Following an episode of typical transient global amnesia (TGA, a female patient reported similar clinical attacks in 2 maternal aunts. Prior reports of familial TGA are few, and no previous account of affected relatives more distant than siblings or parents was discovered in a literature survey. The aetiology of familial TGA is unknown. A pathophysiological mechanism akin to that in migraine attacks, comorbidity reported in a number of the examples of familial TGA, is one possibility. The study of familial TGA cases might facilitate the understanding of TGA aetiology.

  12. Thermal transient anemometer

    Science.gov (United States)

    Bailey, James L.; Vresk, Josip

    1989-01-01

    A thermal transient anemometer having a thermocouple probe which is utilized to measure the change in temperature over a period of time to provide a measure of fluid flow velocity. The thermocouple probe is located in the fluid flow path and pulsed to heat or cool the probe. The cooling of the heated probe or the heating of the cooled probe from the fluid flow over a period of time is measured to determine the fluid flow velocity. The probe is desired to be locally heated near the tip to increase the efficiency of devices incorporating the probe.

  13. Transient regional osteoporosis

    Directory of Open Access Journals (Sweden)

    F. Trotta

    2011-09-01

    Full Text Available Transient osteoporosis of the hip and regional migratory osteoporosis are uncommon and probably underdiagnosed bone diseases characterized by pain and functional limitation mainly affecting weight-bearing joints of the lower limbs. These conditions are usually self-limiting and symptoms tend to abate within a few months without sequelae. Routine laboratory investigations are unremarkable. Middle aged men and women during the last months of pregnancy or in the immediate post-partum period are principally affected. Osteopenia with preservation of articular space and transitory edema of the bone marrow provided by magnetic resonance imaging are common to these two conditions, so they are also known by the term regional transitory osteoporosis. The appearance of bone marrow edema is not specific to regional transitory osteoporosis but can be observed in several diseases, i.e. trauma, reflex sympathetic dystrophy, avascular osteonecrosis, infections, tumors from which it must be differentiated. The etiology of this condition is unknown. Pathogenesis is still debated in particular the relationship with reflex sympathetic dystrophy, with which regional transitory osteoporosis is often identified. The purpose of the present review is to remark on the relationship between transient osteoporosis of the hip and regional migratory osteoporosis with particular attention to the bone marrow edema pattern and relative differential diagnosis.

  14. Transient congenital hypothyroidism

    Directory of Open Access Journals (Sweden)

    Nisha Bhavani

    2011-01-01

    Full Text Available Transient thyroid function abnormalities in the new born which revert back to normal after varying periods of time are mostly identified in the neonatal screening tests for thyroid and are becoming more common because of the survival of many more premature infants. It can be due to factors primarily affecting the thyroid-like iodine deficiency or excess, maternal thyroid-stimulating hormone receptor (TSHR antibodies, maternal use of antithyroid drugs, DUOX 2 (dual oxidase 2 mutations, and prematurity or those that affect the pituitary-like untreated maternal hyperthyroidism, prematurity, and drugs. Most of these require only observation, whereas some, such as those due to maternal TSHR antibodies may last for upto three-to-six months and may necessitate treatment. Isolated hyperthyrotropinemia (normal Tetraiodothyronine (T4 and high Thyroid Stimulating hormone (TSH may persist as subclinical hypothyroidism in childhood. Transient hypothyroxinemia (low T4 and normal TSH is very common in premature babies. The recognition of these conditions will obviate the risks associated with unnecessary thyroxine supplementation in childhood and parental concerns of a life long illness in their offspring.

  15. Sintering study in vertical fixed bed reactor for synthetic aggregate production; Estudo da sinterizacao em reator vertical de leito fixo para producao de agregado sintetico

    Energy Technology Data Exchange (ETDEWEB)

    Quaresma, D.S.; Neves, A.S.S.; Melo, A.O.; Pereira, L.F.S.; Bezerra, P.T.S.; Macedo, E.N.; Souza, J.A.S., E-mail: danysq@gmail.com [Universidade Federal do Para (UFPA), Belem, PA (Brazil). Faculdade de Engenharia Quimica

    2017-04-15

    The synthetic aggregates are being employed in civil construction for the reduction of mineral extraction activities. Within this context, the recycling of industrial waste is the basis of the majority of processes to reduce the exploitation of mineral resources. In this work the sintering in a vertical fixed bed reactor for synthetic aggregate production using 20% pellets and 80% charcoal was studied. The pellets were prepared from a mixture containing clay, charcoal and fly ash. Two experiments varying the speed of air sucking were carried out. The material produced was analyzed by X-ray diffraction, scanning electron microscopy, measures of their ceramic properties, and particle size analysis. The results showed that the solid-state reactions, during the sintering process, were efficient and the produced material was classified as coarse lightweight aggregate. The process is interesting for the sintering of aggregates, and can be controlled by composition, particle size, temperature gradient and gaseous flow. (author)

  16. A digital method for period measurements in a nuclear reactor; Um metodo digital para medidas de periodo em um reator nuclear

    Energy Technology Data Exchange (ETDEWEB)

    Mundim, Sergio Gorretta

    1971-02-15

    The present paper begins by giving a theoretical treatment for the nuclear reactor period. The conventional method of measuring the period is analysed and some previously developed digital methods are described. The paper criticises the latter, pointing out some deficiencies which the proposed process is able to eliminate. All errors connected with this process are also analysed. The paper presents suitable solutions to reduce them to a minimum. The total error is found to he less than the error presented by the other methods described. A digital period meter is designed with memory resources and an automatic scaler changer. Integrated circuits specifications are used in it. Real time experiments with nuclear reactors were made in order to check te validity of the method. The data acquired were applied to a simulated digital period meter implemented in a general purpose computer. The nuclear part of the work was developed at the 'Comissao Nacional de Energia Nuclear' and the simulation work was dane at the 'Departamento de Calculo Cientifico' of COPPE, which also advised the author in the completion of this thesis. (author)

  17. Study of PWR reactor efficiency as a function of turbine steam extractions; Estudo da otimizacao da eficiencia de reator PWR em funcao das extracoes de vapor da turbina

    Energy Technology Data Exchange (ETDEWEB)

    Rocha, Janine Gandolpho da; Alvim, Antonio Carlos Marques; Martinez, Aquilino Senra [Universidade Federal, Rio de Janeiro, RJ (Brazil). Coordenacao dos Programas de Pos-graduacao de Engenharia. Programa de Engenharia Nuclear

    2002-07-01

    The objective of this work is to optimize the extractions of the low-pressure turbine of a PWR nuclear reactor, in order to obtain the best thermodynamic cycle efficiency. We have analyzed typical data of a 1300 MW PWR reactor, operating at 25%, 50%, 75% and 100% capacities, respectively. The first stage of this study consists of generating a mathematical model capable of describing the reactor behavior and efficiency at any power level. The second stage of this study consists of to combine the generated mathematical model in an optimization computer program that optimize the extractions flow of the low-pressure turbine until it finds the optimal system efficiency. This work does not alter the nuclear facility project in any way. (author)

  18. Uso de reator air-lift em batelada para tratamento de efluentes de uma indústria de beneficiamento de coco

    Directory of Open Access Journals (Sweden)

    Antonio Martins Oliveira Junior

    2011-01-01

    treatment periods (0.5 h and 1 h were conducted. A reduction in the level of TOG to 0.035 g/L, and pH to 5.17 for different process times without the addition of aluminum sulfate, in accordance with Resolution 357/05 of the CONAMA (Conselho Nacional do Meio Ambiente were observed. It was verified that this effect did not occur in relation to turbidity, despite the significant reduction to 34 NTU with the addition of aluminum sulfate. Nevertheless, the air-lift reactor proved to be a good option for treatment of wastewater of this nature with low operating costs.

  19. Time dependent analysis of Xenon spatial oscillations in small power reactors; Analise temporal das oscilacoes espaciais de Xenonio em reatores de pequeno porte

    Energy Technology Data Exchange (ETDEWEB)

    Decco, Claudia Cristina Ghirardello

    1997-07-01

    This work presents time dependent analysis of xenon spatial oscillations studying the influence of the power density distribution, type of reactivity perturbation, power level and core size, using the one-dimensional and three-dimensional analysis with the MID2 and citation codes, respectively. It is concluded that small pressurized water reactors with height smaller than 1.5 m are stable and do not have xenon spatial oscillations. (author)

  20. Updraft biomass gasification reactor evaluation of fuel; Reator de gaseificacao de biomassa em fluxo contra corrente para aquecimento de ar de secagem

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Ivanildo da S. dos; Silva, Jadir N. da; Martins, Marcio A. [Universidade Federal de Vicosa (UFV), MG (Brazil)], Emails: ivanildomt@gmail.com, jadir@ufv.br, aredes@ufv.br

    2010-07-01

    Searching for a clean hot air from biomass for on farm applications, a gasification/combustion system was designed, built and evaluated. The system consisted of a countercurrent gasifier, coupled with a combustion chamber that burns the producer gas, and eucalyptus firewood was used as a fuel. Willing to reduce heat losses from the unit as well as to prevent thermal hazardous the unit was totally covered with brick's wall. Initial unit thermal efficiency was of about 56% and it reaches up to 71% at recharge. It was concluded that this system attended the proposed objectives, producing clean hot air that can be used for drying purposes as well as ambient space heating. (author)

  1. Transient osteoporosis of the hip

    International Nuclear Information System (INIS)

    McWalter, Patricia; Hassan Ahmed

    2007-01-01

    Transient osteoporosis of the hip is an uncommon cause of hip pain, mostly affecting healthy middle-aged men and also women in the third trimester of pregnancy. We present a case of transient osteoporosis of the hip in a 33-year-old non-pregnant female patient. This case highlights the importance of considering a diagnosis of transient osteoporosis of the hip in patients who present with hip pain. (author)

  2. Transient Go: A Mobile App for Transient Astronomy Outreach

    Science.gov (United States)

    Crichton, D.; Mahabal, A.; Djorgovski, S. G.; Drake, A.; Early, J.; Ivezic, Z.; Jacoby, S.; Kanbur, S.

    2016-12-01

    Augmented Reality (AR) is set to revolutionize human interaction with the real world as demonstrated by the phenomenal success of `Pokemon Go'. That very technology can be used to rekindle the interest in science at the school level. We are in the process of developing a prototype app based on sky maps that will use AR to introduce different classes of astronomical transients to students as they are discovered i.e. in real-time. This will involve transient streams from surveys such as the Catalina Real-time Transient Survey (CRTS) today and the Large Synoptic Survey Telescope (LSST) in the near future. The transient streams will be combined with archival and latest image cut-outs and other auxiliary data as well as historical and statistical perspectives on each of the transient types being served. Such an app could easily be adapted to work with various NASA missions and NSF projects to enrich the student experience.

  3. Nonspecific competition underlies transient attention

    NARCIS (Netherlands)

    Wilschut, A.M.; Theeuwes, J.; Olivers, C.N.L.

    2015-01-01

    Cueing a target by abrupt visual stimuli enhances its perception in a rapid but short-lived fashion, an effect known as transient attention. Our recent study showed that when targets are cued at a constant, central location, the emergence of the transient performance pattern was dependent on the

  4. Transients by substructuring with DMAP

    Science.gov (United States)

    Butler, T. G.

    1978-01-01

    Automated substructuring in level 16 of NASTRAN was employed as a preface to the solution of a direct transient analysis. The DMAP ALTER statements written to adapt the substructuring for transient purposes are explained. Data recovery was accomplished with transfer functions. Proof of the success of the method is presented with an application to a missile structure.

  5. Ion Acceleration Inside Foreshock Transients

    Science.gov (United States)

    Liu, Terry Z.; Lu, San; Angelopoulos, Vassilis; Lin, Yu; Wang, X. Y.

    2018-01-01

    Recent observations upstream of Earth's bow shock have revealed that foreshock transients can not only accelerate solar wind ions by reflection at their upstream boundaries but may also accelerate ions inside them. Evidence for the latter comes from comparisons of ion spectra inside and outside the cores, and from evidence of leakage of suprathermal ions from the cores. However, definite evidence for, and the physics of, ion acceleration in the foreshock transients are still open questions. Using case studies of foreshock transients from Time History of Events and Macroscale Interactions during Substorms observations, we reveal an ion acceleration mechanism in foreshock transients that is applicable to 25% of the transients. The ion energy flux is enhanced between several keV to tens of keV in the cores. We show that these energetic ions are reflected at the earthward moving boundary of foreshock transients, are accelerated through partial gyration along the convection electric field, and can leak out both upstream and downstream of the foreshock transients. Using ions moving self-consistently with a generic 3-D global hybrid simulation of a foreshock transient, we confirm this physical picture of ion acceleration and leakage. These accelerated ions could be further accelerated at the local bow shock and repopulate the foreshock, increasing the efficacy of solar wind-magnetosphere interactions.

  6. Pressure transients in pipeline systems

    DEFF Research Database (Denmark)

    Voigt, Kristian

    1998-01-01

    This text is to give an overview of the necessary background to do investigation of pressure transients via simulations. It will describe briefly the Method of Characteristics which is the defacto standard for simulating pressure transients. Much of the text has been adopted from the book Pressur...

  7. Corrosão de liga 800GN em ambiente do circuito secundário da Central Nuclear de Angra 2

    OpenAIRE

    Fabio Abud Mansur

    2015-01-01

    A liga 800GN (grau nuclear) é um material utilizado na fabricação de geradores de vapor para reatores de água pressurizada (PWR) de usinas nucleares devido à sua elevada resistência à corrosão. A resistência à corrosão da liga 800GN é devida ao caráter protetor da película de óxido formada na superfície do tubo em contato com a água pressurizada à alta temperatura. No entanto, a corrosão tem sido a principal causa de falhas nos tubos dos geradores de vapor de usinas nucleares. Os problemas ge...

  8. Transient Enhanced Diffusion

    Science.gov (United States)

    Gossmann, Hans-Joachim L.

    1996-03-01

    Ion implantation is the standard method for dopant introduction during integrated circuit manufacturing, determining crucial device characteristics. Implantation creates point-defects, such as Si self-interstitials and vacancies, far in excess of equilibrium concentrations. Since the diffusion of common dopants involves Si point defects, the interaction of damage and dopants during subsequent annealing steps leads to the phenomenon known as "transient enhanced diffusion" (TED): The dopant diffusivities are enhanced, possibly by many orders of magnitude. The enhancement is transient since the intrinsic defects eventually diffuse into the bulk or annihilate at the surface. The desired specific dopant profile of the device is thus the result of a complex reaction, involving the creation of damage and its spatial distribution, diffusion, and interaction of the point defects among themselves and with interfaces and other defects. As device dimensions shrink and experiments become more and more expensive, the capability to predict these kinds of non-equilibrium phenomena accurately becomes crucial to Si technology development. In our experiments to extract physical mechanisms and parameters of TED we use the method of sharp B- and Sb doping spikes to track interstitial and vacancy concentrations as a function of depth during processing. Thus we gain sensitivity to small diffusion distances (low temperatures) and separate the damaged region from the region of the interaction with dopants. In addition, our method yields directly the actual point defect diffusivity. Although an ion implant initially produces Frenkel pairs, Monte-carlo simulations show that the vacancies annihilate quickly. The excess interstitials, roughly one for each implanted ion coalesce into 311defects. The subsequent evaporation of interstitials from 311ś drives TED. Si interstitial diffusion is influenced by carbon-related traps and we will demonstrate that this finding reconciles quantitatively a

  9. Applied hydraulic transients

    CERN Document Server

    Chaudhry, M Hanif

    2014-01-01

    This book covers hydraulic transients in a comprehensive and systematic manner from introduction to advanced level and presents various methods of analysis for computer solution. The field of application of the book is very broad and diverse and covers areas such as hydroelectric projects, pumped storage schemes, water-supply systems, cooling-water systems, oil pipelines and industrial piping systems. Strong emphasis is given to practical applications, including several case studies, problems of applied nature, and design criteria. This will help design engineers and introduce students to real-life projects. This book also: ·         Presents modern methods of analysis suitable for computer analysis, such as the method of characteristics, explicit and implicit finite-difference methods and matrix methods ·         Includes case studies of actual projects ·         Provides extensive and complete treatment of governed hydraulic turbines ·         Presents design charts, desi...

  10. Study of the mechanisms for the emergency cooling of the core of the Radioisotope Producing Reator (RPR)

    International Nuclear Information System (INIS)

    Lacerda, F.C.

    1987-01-01

    The mechanisms for the emergency cooling of the core of the Radioisotope Producing Reactor (R.P.R.) are studied, in particular the thermal-hydraulic behaviour of the coolant after reactor shut-down. The coolant operates bd convection, and flows downward through the core passing into beel-shaped plenum that encloses the core and proceeding across the primary cooling loop. When the reactor is shut-down, the coolant flow undergoes a transient period until the steady state of natural convection is reached, after which the coolant flows upwards from the lower plenum. A plocking valve will be installed at the exit of the lower plenum, which will automatically shut in case of an accident that will involve the loss of flow in the primary circuit. The present work aims at evaluating the contribution of natural convection by natural recirculation in the core when the blocking valve is close, and via the external coolant circuit when the blocking valve is open. In particular, we study the natural self-regulating mechanisms of extraction of the heat generated by the fission product after reactor shut-down. (author) [pt

  11. Determinação de manganês em presença de ferro: análise de solo por ativação neutrônica instrumental

    Directory of Open Access Journals (Sweden)

    Leonardo Alves da Costa

    2012-06-01

    Full Text Available A técnica analítica nuclear de ativação neutrônica é multielementar, precisa, exata e, além de outras características, tem sido indicada como técnica primária na determinação elementar principalmente de solo. Entretanto, ao ser aplicada, não está isenta de interferências inerentes à técnica, como a ocorrência de reações de interferências primárias, cuja contribuição depende das características do fluxo de nêutrons do reator, do local de irradiação, etc. Essas reações ocorrem durante a irradiação, quando a amostra é submetida ao fluxo de nêutrons no reator no qual há contribuição de nêutrons de diversas energias. Uma interferência que pode ser significativa é a determinação de Mn em presença de Fe, pois a formação extra do 56Mn poderá não permitir afirmar se a concentração de Mn determinada deve-se à interferência do Fe ou não. Para verificar se essa interferência é significativa, ao analisar amostras com elevada concentração de Fe no reator TRIGA MARK I IPR-R1 do CDTN/CNEN, foi realizado este estudo, visando determinar o Mn em solo do Quadrilátero Ferrífero, Minas Gerais, Brasil, no qual há ocorrência de minérios com teores da ordem de 40 a 60 % em Fe. Os resultados mostraram que na reação de 56Fe com nêutrons rápidos a formação de 56Mn é pouco significativa, não havendo necessidade de aplicar a correção da interferência.

  12. Síntese de Al2O3/SiC em forno de microondas: estudo de parâmetros do processo Synthesis of Al2O3/SiC in microwave oven: study of the processing parameters

    Directory of Open Access Journals (Sweden)

    T. P. Deksnys

    2005-12-01

    Full Text Available Estudos demonstram a eficiência do método de moagem prévia do aluminossilicato precursor para a síntese da fase Al2O3/SiC por meio da reação de redução carbotérmica em forno de microondas. No presente trabalho, além da moagem do precursor, outros parâmetros de reação foram estudados, como tempo de reação, potência da radiação emitida e fluxo de gás. As reações foram realizadas em forno de microondas semi-industrial, com adaptação para inserção de gás inerte. Dois tipos de reatores foram avaliados: um reator cilíndrico, termicamente isolado, e um reator tubular de leito fixo, nos quais foram colocados os precursores peletizados. Existe uma relação direta entre a saturação da atmosfera de reação com a cinética de redução carbotérmica do aluminossilicato. Esse comportamento, aliado a elevadas potências de emissão, favorecem a formação da fase Al2O3/SiC em períodos de tempo reduzidos.Results presented elsewhere have confirmed the feasibility of the previous milling process of the starting materials for the synthesis of Al2O3/SiC by the microwave-assisted carbothermal reduction. In the present work, parameters such as precursor milling, reaction time, microwave's power level and gas flow have been investigated. Reactions were carried out in a semi-industrial microwave oven (Cober Inc., USA, which allowed the inert gas insertion. Two reactions arrangement were developed to perform the synthesis: a cylindrical reactor, thermally insulated and a pipe fluidized bed reactor. Into both reactors, the precursor was applied in a palletized form to react. There is a direct relation between the reaction atmosphere saturation and the kinetics of the carbothermal reduction. This behavior, in addiction to high power levels of microwave radiation (>1.5 KW, favors the formation of Al2O3/SiC in a short time.

  13. AVALIAÇÃO DA EFICIÊNCIA DE UM SISTEMA DE TRATAMENTO DA ÁGUA EM PEQUENA PROPRIEDADE RURAL, UTILIZANDO BIOENSAIOS

    Directory of Open Access Journals (Sweden)

    Geani Mohr

    2013-07-01

    Full Text Available O trabalho teve como objetivo avaliar a toxicidade aguda do efluente de um sistema de tratamento de água em pequena propriedade rural, utilizando Daphnia magna Straus como organismo-teste. Os processos empregados no tratamento foram: tratamento primário (reatores anaeróbios, tratamento secundário/terciário (Wetlands construídos - WC’s e tratamento final (sistema de desinfecção Ultra Violeta - UV. Entre os meses de dezembro e junho de 2012, foram coletadas 30 amostras de cinco fases distintas (Bruto - P1, Água da Chuva - P2, Reator anaeróbico de fluxo ascendente e manta de lodo (UASB - P3, WC’s-P4 e desinfecção com UV - P5. Os resultados indicaram toxicidade aguda em P1, com uma CE(I50% 48h de 25,8 ± 23,64% (n = 6; CV = 109,2%, correspondendo a uma amostra altamente tóxica. Nos pontos P2 e P3, as amostras apresentaram uma CE(I50% 48h de 5,1% ± 3,5% (n = 6; CV = 145,7% e 36,7 ± 23,9% (n = 6; CV = 153,5%, correspondendo a uma amostra extremamente tóxica e altamente tóxica, respectivamente. Os efluentes dos pontos P4 (n = 6 e P5 (n = 6 não apresentaram toxicidade. Desta forma, os resultados demonstraram a eficiência da capacidade de detoxificação dos processosWC’s e UV.

  14. Determinação espectrofotométrica de aspartame em adoçantes por injeção em fluxo usando um reator em fase sólida contendo fosfato de zinco imobilizado

    Directory of Open Access Journals (Sweden)

    Pereira Airton Vicente

    2000-01-01

    Full Text Available A flow injection spectrophotometric method was developed for determining aspartame in sweeteners. Sample was dissolved in water and 250 µL of the solution was injected into a carrier stream of 5.0 x 10-5 mol L-1 sodium borate solution. The sample flowed through a column (14 cm x 2.0 mm packed with Zn3(PO42 immobilized in a polymeric matrix of polyester resin and Zn(II ions were released from the solid-phase reactor by formation of the Zn(II-aspartame complex. The mixture merged with a stream of borate buffer solution (pH 9.0 containing 0.030 % (m/v alizarin red S and the Zn(II-alizarin red complex formed was measured spectrophotometrically at 540 nm. The calibration graph for aspartame was linear in the concentration range from 10 to 80 µg mL-1 with a detection limit of 4 µg mL-1 of aspartame. The RSD was 0.3 % for a solution containing 40 µg mL-1 aspartame (n = 10 and seventy results were obtained per hour. The proposed method was applied for determining aspartame in commercial sweeteners.

  15. Computer simulation of thermal-hydraulic transient events in multi-circuits with multipumps

    International Nuclear Information System (INIS)

    Veloso, Marcelo Antonio

    2003-01-01

    PANTERA-2 (from Programa para Analise Termo-hidraulica de Reatores a Agua - Program for Thermal-hydraulic Analysis of Water Reactors, Version 2), whose fundamentals are described in this work, is intended to carry out rod bundle subchannel analysis in conjunction with multiloop simulation. It solves simultaneously the conservation equations of mass, axial and lateral momentum, and energy for subchannel geometry coupled with the balance equations that describe the fluid flows in any number of coolant loops connected to a pressure vessel containing the rod bundle. As far as subchannel analysis is concerned, the basic computational strategy of PANTERA-2 comes from COBRA codes, but an alternative implicit solution method oriented to the pressure field has been used to solve the finite difference approximations for the balance laws. The results provided by the subchannel model comprise the fluid density, enthalpy, flow rate, and pressure fields in the subchannels. The loop model predicts the individual loop flows, total flow through the pressure vessel, and pump rotational speeds as a function of time subsequent to the failure of any number of the coolant pumps. The flow transients in the loops may initiated by partial, total or sequential loss of electric power to the operating pumps. Transient events caused by either shaft break or rotor locking may also be simulated. The changes in rotational speed of the pumps as a function of rime are determined from a torque balance. Pump dynamic head and hydraulic torque are calculated as a function of rotational speed and volumetric flow from two polar homologous curves supplied to the code in the tabular form. In order to illustrate the analytical capability of PANTERA-2, three sample problems are presented and discussed. Comparisons between calculated and measured results indicate that the program reproduces with a good accuracy experimental data for subchannel exit temperatures and critical heat fluxes in 5x5 rod bundles. It

  16. Electromagnetic transients in power cables

    CERN Document Server

    da Silva, Filipe Faria

    2013-01-01

    From the more basic concepts to the most advanced ones where long and laborious simulation models are required, Electromagnetic Transients in Power Cables provides a thorough insight into the study of electromagnetic transients and underground power cables. Explanations and demonstrations of different electromagnetic transient phenomena are provided, from simple lumped-parameter circuits to complex cable-based high voltage networks, as well as instructions on how to model the cables.Supported throughout by illustrations, circuit diagrams and simulation results, each chapter contains exercises,

  17. CHARACTERIZATION OF TRANSIENT PUFF EMISSIONS ...

    Science.gov (United States)

    Symposium Paper Transient puff emissions were characterized from burning carpet charges that were fed to a pilotscale rotary kiln combustor to assess the potential impact on emissions of using post-consumer carpet as an alternative fuel in cement kilns.

  18. Transient heating of moving objects

    Directory of Open Access Journals (Sweden)

    E.I. Baida

    2014-06-01

    Full Text Available A mathematical model of transient and quasistatic heating of moving objects by various heat sources is considered. The mathematical formulation of the problem is described, examples of thermal calculation given.

  19. Transient two-phase flow

    International Nuclear Information System (INIS)

    Hsu, Y.Y.

    1974-01-01

    The following papers related to two-phase flow are summarized: current assumptions made in two-phase flow modeling; two-phase unsteady blowdown from pipes, flow pattern in Laval nozzle and two-phase flow dynamics; dependence of radial heat and momentum diffusion; transient behavior of the liquid film around the expanding gas slug in a vertical tube; flooding phenomena in BWR fuel bundles; and transient effects in bubble two-phase flow. (U.S.)

  20. Transient stability of superconducting alternators

    International Nuclear Information System (INIS)

    Furuyama, M.; Kirtley, J.L. Jr.

    1975-01-01

    A simulation study is performed for the purpose of determining the transient stability characteristics of superconducting alternators. This simulation is compared with an equal area criterion method. It is found that superconducting machines have good transient stability characteristics, that field forcing is not particularly helpful nor necessary. It is also found that the equal area criterion is useful for computing critical clearing times, if voltage behind subtransient reactance is held constant. (U.S.)

  1. Transient magnetoviscosity of dilute ferrofluids

    International Nuclear Information System (INIS)

    Soto-Aquino, Denisse; Rinaldi, Carlos

    2011-01-01

    The magnetic field induced change in the viscosity of a ferrofluid, commonly known as the magnetoviscous effect and parameterized through the magnetoviscosity, is one of the most interesting and practically relevant aspects of ferrofluid phenomena. Although the steady state behavior of ferrofluids under conditions of applied constant magnetic fields has received considerable attention, comparatively little attention has been given to the transient response of the magnetoviscosity to changes in the applied magnetic field or rate of shear deformation. Such transient response can provide further insight into the dynamics of ferrofluids and find practical application in the design of devices that take advantage of the magnetoviscous effect and inevitably must deal with changes in the applied magnetic field and deformation. In this contribution Brownian dynamics simulations and a simple model based on the ferrohydrodynamics equations are applied to explore the dependence of the transient magnetoviscosity for two cases: (I) a ferrofluid in a constant shear flow wherein the magnetic field is suddenly turned on, and (II) a ferrofluid in a constant magnetic field wherein the shear flow is suddenly started. Both simulations and analysis show that the transient approach to a steady state magnetoviscosity can be either monotonic or oscillatory depending on the relative magnitudes of the applied magnetic field and shear rate. - Research Highlights: →Rotational Brownian dynamics simulations were used to study the transient behavior of the magnetoviscosity of ferrofluids. →Damped and oscillatory approach to steady state magnetoviscosity was observed for step changes in shear rate and magnetic field. →A model based on the ferrohydrodynamics equations qualitatively captured the damped and oscillatory features of the transient response →The transient behavior is due to the interplay of hydrodynamic, magnetic, and Brownian torques on the suspended particles.

  2. An Expectation-Maximization Algorithm for Amplitude Estimation of Saturated Optical Transient Signals.

    Energy Technology Data Exchange (ETDEWEB)

    Kagie, Matthew J. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Lanterman, Aaron D. [Georgia Inst. of Technology, Atlanta, GA (United States)

    2017-12-01

    This paper addresses parameter estimation for an optical transient signal when the received data has been right-censored. We develop an expectation-maximization (EM) algorithm to estimate the amplitude of a Poisson intensity with a known shape in the presence of additive background counts, where the measurements are subject to saturation effects. We compare the results of our algorithm with those of an EM algorithm that is unaware of the censoring.

  3. NITRIFICAÇÃO DE DIFERENTES SUBSTRATOS EM REATORES AERÓBIOS DE LEITO FLUIDIZADO DE CIRCULAÇÃO INTERNA NITRIFICAÇÃO DE DIFERENTES SUBSTRATOS EM REATORES AERÓBIOS DE LEITO FLUIDIZADO DE CIRCULAÇÃO INTERNA

    Directory of Open Access Journals (Sweden)

    Iván Andrés Sánchez Ortiz

    2012-12-01

    Full Text Available En esta investigación se estudió la eficiencia de remoción de nitrógeno total (NT y nitrógeno amoniacal total (NAT en aguas residuales de piscicultura intensiva y domésticas por medio de reactores aerobios de lecho fluidizado trifásicos con circulación en tubos concéntricos. Se utilizaron diferentes diámetros internos (100; 125 y 150mm para un mismo diámetro externo de 250mm; se utilizó arena para filtros y carbón activado granular como medio soporte; los reactores se ensayaron con tiempos de retención hidráulica de 11.5 min para el reactor R100, y de tres horas para los R125 y R150. Las eficiencias medias de remoción del NT y del NAT fueron: en el R100 de 24% y 27%; en el R125 de 38% y 40%; y en el R150 de 30% y 49%, respectivamente. Cuanto mayor el diámetro interno mejor fue la eficiencia de remoción de NAT.This research was intended to study the efficiency of removing total nitrogen (TN and total ammoniacal nitrogen (TAN in waste water of intensive and domestic fish farming, through three-phase fluidized bed aerobic reactors with circulation in concentric tubes. Several internal diameters (100; 125; and 150 mm were used for the same external diameter of 250 mm; filter sand and granular activated carbon were used as a support medium; reactors were tested with hydraulic retention times of 11.5 minutes for R100 reactor and three hours for R125 and R150 reactors. Mean removal efficiencies of TN and TAN were as follows: 24% for R100 Reactor; 38% and 40% for R125 Reactor; and 30% and 49% for R150 Reactor, respectively. The bigger the internal diameter the better the efficiency of TAN removal.

  4. Estudo da imobilização de rejeitos radioativos em matrizes asfálticas e resíduos elastoméricos utilizando a técnica de microndas

    OpenAIRE

    Reinaldo Leonel Caratin

    2007-01-01

    No presente trabalho, foi utilizada a técnica de aquecimento por microondas para estudar a imobilização de rejeitos radioativos de nível de atividade baixo e médio, como resinas de troca iônica exauridas, empregadas na remoção de íons indesejáveis dos circuitos primários de refrigeração de reatores nucleares refrigerados a água, e aquelas usadas em colunas de separação química e radionuclídica no controle de qualidade de radioisótopos. Matrizes betuminosas reforçadas com alguns tipos de borra...

  5. Recent development of transient electronics

    Directory of Open Access Journals (Sweden)

    Huanyu Cheng

    2016-01-01

    Full Text Available Transient electronics are an emerging class of electronics with the unique characteristic to completely dissolve within a programmed period of time. Since no harmful byproducts are released, these electronics can be used in the human body as a diagnostic tool, for instance, or they can be used as environmentally friendly alternatives to existing electronics which disintegrate when exposed to water. Thus, the most crucial aspect of transient electronics is their ability to disintegrate in a practical manner and a review of the literature on this topic is essential for understanding the current capabilities of transient electronics and areas of future research. In the past, only partial dissolution of transient electronics was possible, however, total dissolution has been achieved with a recent discovery that silicon nanomembrane undergoes hydrolysis. The use of single- and multi-layered structures has also been explored as a way to extend the lifetime of the electronics. Analytical models have been developed to study the dissolution of various functional materials as well as the devices constructed from this set of functional materials and these models prove to be useful in the design of the transient electronics.

  6. Transient Faults in Computer Systems

    Science.gov (United States)

    Masson, Gerald M.

    1993-01-01

    A powerful technique particularly appropriate for the detection of errors caused by transient faults in computer systems was developed. The technique can be implemented in either software or hardware; the research conducted thus far primarily considered software implementations. The error detection technique developed has the distinct advantage of having provably complete coverage of all errors caused by transient faults that affect the output produced by the execution of a program. In other words, the technique does not have to be tuned to a particular error model to enhance error coverage. Also, the correctness of the technique can be formally verified. The technique uses time and software redundancy. The foundation for an effective, low-overhead, software-based certification trail approach to real-time error detection resulting from transient fault phenomena was developed.

  7. Cohabitation Duration and Transient Domesticity.

    Science.gov (United States)

    Golub, Andrew; Reid, Megan; Strickler, Jennifer; Dunlap, Eloise

    2013-01-01

    Research finds that many impoverished urban Black adults engage in a pattern of partnering and family formation involving a succession of short cohabitations yielding children, a paradigm referred to as transient domesticity. Researchers have identified socioeconomic status, cultural adaptations, and urbanicity as explanations for aspects of this pattern. We used longitudinal data from the 2001 Survey of Income and Program Participation to analyze variation in cohabitation and marriage duration by race/ethnicity, income, and urban residence. Proportional hazards regression indicated that separation risk is greater among couples that are cohabiting, below 200% of the federal poverty line, and Black but is not greater among urban dwellers. This provides empirical demographic evidence to support the emerging theory of transient domesticity and suggests that both socioeconomic status and race explain this pattern. We discuss the implications of these findings for understanding transient domesticity and make recommendations for using the Survey of Income and Program Participation to further study this family formation paradigm.

  8. Explosive and Radio-Selected Transients: Transient Astronomy with ...

    Indian Academy of Sciences (India)

    Therefore, multiwaveband observational efforts with wide fields of view will be the key to progress of transients astronomy from the middle 2020s offering unprecedented deep images and high spatial and spectral resolutions. Radio observations of Gamma Ray Bursts (GRBs) with SKA will uncover not only much fainter ...

  9. Transient analysis of multicavity klystrons

    International Nuclear Information System (INIS)

    Lavine, T.L.; Miller, R.H.; Morton, P.L.; Ruth, R.D.

    1988-09-01

    We describe a model for analytic analysis of transients in multicavity klystron output power and phase. Cavities are modeled as resonant circuits, while bunching of the beam is modeled using linear space-charge wave theory. Our analysis has been implemented in a computer program which we use in designing multicavity klystrons with stable output power and phase. We present as examples transient analysis of a relativistic klystron using a magnetic pulse compression modulator, and of a conventional klystron designed to use phase shifting techniques for RF pulse compression. 4 refs., 4 figs

  10. Método de número mais provável para avaliação de grupos fisiológicos de microrganismos em digestão anaeróbia de água residuária de mandioca / Most probable number method for microorganism physiologic group's evaluation in anaerobic digestion of cassava wastewater

    Directory of Open Access Journals (Sweden)

    Maria Magdalena Ferreira Ribas

    2009-12-01

    Full Text Available ResumoA avaliação da microbiologia anaeróbia é um método caro e muito difícil. Técnicas simples são disponíveis para avaliação de microrganismos de diversos usos como médico, alimentar, ambiental e sistemas anaeróbios para tratamento de efluentes. Uma metodologia desenvolvida foi usada para avaliar a atividade de grupos de microrganismos em digestão anaeróbia com possível aplicação a substratos específicos. A técnica usa gases isentos de oxigênio em frascos tipo penicilina e fechados com tampa de borracha e selo de alumínio, onde foi adicionado um indicador de redução, complementos nutricionais e agentes redutores após a esterilização. O metabolismo dos microrganismos foi observado nesses frascos fechados depois de um período de incubação de quatorze dias pela variação da turbidez, de pH medido em indicador de Arrhenius e de gás capturado em tubos Duran. A técnica do Número Mais Provável (NMP foi usada para contagem de microrganismos em meio de cultivo adaptado para grupos específicos de microrganismos que eram esperados para se desenvolver em água residuária de mandioca com amido e seus hidrolisados (dextrina, maltose e glicose como fonte de energia. Para aferir o método, amostras foram coletadas de um reator acidogênico de mistura completa ligado a um reator metanogênico de leito fixo, ambos alimentados com água residuária de mandioca. O gás capturado nos tubos Duran dos frascos de penicilina foi analisado por cromatografia quanto ao conteúdo de metano. O uso dos meios permitiu separar os microrganismos em três grupos usando meio de cultivo seletivo: Meio Mínimo (MM sem substratos orgânicos, Meio Completo (MC com uma mistura de amido de mandioca e seus hidrolisados e Meio Diferencial (MD usando cada derivado de amido isoladamente. O sistema de tratamento anaeróbio no período analisado operou com um bom desempenho e a microbiologia confirmou estes resultados. No efluente do reator acidog

  11. Fuel rod behaviour during transients

    International Nuclear Information System (INIS)

    Hughes, H.; Haste, T.J.; Cameron, R.F.; Sinclair, J.E.

    1982-04-01

    The fuel pin performance code SLEUTH, the transient codes FRAP-T5 and TRAFIC and the clad deformation code CANSWEL-2 are described. It is shown how the codes treat gas release, pin cooling, cladding deformation and interaction, gap conductance etc. The materials properties used are indicated. (author)

  12. Charging transient in polyvinyl formal

    Indian Academy of Sciences (India)

    Unknown

    401–406. © Indian Academy of Sciences. 401. Charging transient in polyvinyl formal. P K KHARE*, P L JAIN† and R K PANDEY‡. Department of Postgraduate Studies & Research in Physics & Electronics, Rani Durgavati University,. Jabalpur 482 001, India. †Department of Physics, Government PG College, Damoh 470 ...

  13. Transient interactions between photosynthetic proteins

    NARCIS (Netherlands)

    Hulsker, Rinske

    2008-01-01

    The biological processes that are the basis of all life forms are mediated largely by protein-protein interactions. The protein complexes involved in these interactions can be categorised by their affinity, which results in a range from static to transient complexes. Electron transfer complexes,

  14. Simulation Model of a Transient

    DEFF Research Database (Denmark)

    Jauch, Clemens; Sørensen, Poul; Bak-Jensen, Birgitte

    2005-01-01

    This paper describes the simulation model of a controller that enables an active-stall wind turbine to ride through transient faults. The simulated wind turbine is connected to a simple model of a power system. Certain fault scenarios are specified and the turbine shall be able to sustain operati...

  15. Transient anisotropic magnetic field calculation

    International Nuclear Information System (INIS)

    Jesenik, Marko; Gorican, Viktor; Trlep, Mladen; Hamler, Anton; Stumberger, Bojan

    2006-01-01

    For anisotropic magnetic material, nonlinear magnetic characteristics of the material are described with magnetization curves for different magnetization directions. The paper presents transient finite element calculation of the magnetic field in the anisotropic magnetic material based on the measured magnetization curves for different magnetization directions. For the verification of the calculation method some results of the calculation are compared with the measurement

  16. Transient filament stretching rheometer II

    DEFF Research Database (Denmark)

    Kolte, Mette Irene; Rasmussen, Henrik K.; Hassager, Ole

    1997-01-01

    The Lagrangian sspecification is used to simulate the transient stretching filament rheometer. Simulations are performed for dilute PIB-solutions modeled as a four mode Oldroyd-B fluid and a semidilute PIB-solution modeled as a non-linear single integral equation. The simulations are compared...

  17. TRATAMENTO DE EFLUENTES ÁCIDOS RICOS EM METAIS COM AUXÍLIO DE SULFETO BIOGÊNICO E CAL

    Directory of Open Access Journals (Sweden)

    Damaris Guimarães

    2014-07-01

    Full Text Available A proposta do presente trabalho foi estudar uma forma de tratamento alternativo para efluentes líquidos ácidos ricos em metais utilizando para isso um efluente sulfetogênico gerado em um reator anaeróbio (UASB e cal. Os ensaios foram realizados em batelada utilizando dois efluentes ácidos distintos: (i um efluente proveniente de ensaios de lixiviação e (ii um efluente ácido proveniente de um laboratório de pesquisas na área de Bio&Hidrometalurgia. O efluente dos ensaios de lixiviação apresentou pH inicial de 1,7 e elevadas concentrações dos metais: Al (545,5mg/L, Ca (668,1mg/L, Cu (37,6mg/L, Fe (1148,4mg/L, Mg (1105,9mg/L e Ni (82,3mg/L, enquanto que o efluente do laboratório era composto por Cu (4,8mg/L, Fe (342,2mg/L e Ni (3,1mg/L, sendo o pH inicial de 0,14. O tratamento consistiu em adicionar o efluente sulfetogênico aos efluentes ácidos, em diferentes proporções, sendo observadas remoções consideráveis dos metais, principalmente, Fe e Ni, e uma elevação no valor de pH. Em seguida, a fim de se obter melhores resultados de remoção para os metais, os efluentes foram tratados com cal, enquadrando-se aos padrões do CONAMA para o lançamento de efluentes.

  18. [Transient amnesia in the elderly].

    Science.gov (United States)

    Sellal, François

    2006-03-01

    The two main aetiologies of transient amnesia in the elderly are idiopathic transient global amnesia (TGA) and iatrogenic or toxic amnesia. Vascular and epileptic amnesia are less common. According to the literature, transient psychogenic amnesia, which is a frequent cause of amnesia at age 30 to 50, is very rare in the elderly. TGA is the prototypical picture of transient amnesia. It occurs more often after age 50, with no identified cause, even if some authors accept emotional stress or minor head trauma as occasional precipitants. The mechanism of TGA remains a matter of discussion. It may be the consequence of a spreading depression similar to that described in migraine with aura, but other arguments support an ischemic mechanism. Iatrogenic amnesias are mainly caused by benzodiazepines (BZs) or anticholinergics. The former may occur in a non-anxious subject, who is not a usual consumer of BZ and takes a single dose. The latter are more often due to a hypersensitivity to anticholinergic drugs, in particular in patients presenting with a covert, incipient Alzheimer's disease. A vascular origin must be considered when amnesia is accompanied by other neurological symptoms, and when the regression of the amnesic disorder is slow, lasting several days. It results from lesions involving various mechanisms and locations, mainly subcortical. Partial seizures, most often mesio-temporal, more rarely frontal, may be the cause of transient amnesia in the elderly, in the absence of a past history of epilepsy. The red flag supportive of an epileptic origin is the repetition of stereotyped amnesic episodes. EEG demonstration of seizures may be difficult and the response to antiepileptic drugs effective on partial seizures is usually good.

  19. Conversão catalítica do etanol sobre catalisadores suportados em ZSM-5

    Directory of Open Access Journals (Sweden)

    D. S. Lima

    Full Text Available Resumo O petróleo, fonte de energia não renovável, é a principal matéria-prima usada na produção de derivados como combustíveis, lubrificantes e petroquímicos básicos. Neste contexto o etanol, uma matéria-prima renovável, torna-se fonte para a obtenção de hidrocarbonetos de maior valor agregado, tais como, benzeno, tolueno, etc. Este trabalho teve como objetivo avaliar o efeito de diferentes metais suportados em zeólita HZSM-5 para a conversão do etanol em produtos com maior valor agregado. Duas séries de catalisadores foram preparadas com diferentes metais e diferentes teores de Ni em HZSM-5 comercial. As amostras foram caracterizadas por área específica SBET, DRX, TPD-NH3 e TPO. Os ensaios de atividade foram realizados em um reator tubular de leito fixo na faixa de temperatura entre 300 e 400 °C, usando etanol como reagente. Os resultados sugerem que o tipo e a quantidade de metal usado na modificação da zeólita HZSM-5 comercial influencia a seletividade para formação dos hidrocarbonetos superiores, bem como a temperatura de reação. A utilização de menores vazões favoreceu a formação de produtos pesados. A formação dos hidrocarbonetos superiores diminuiu ao longo da reação devido à deposição de carbono sobre a superfície do catalisador.

  20. Efeito do bicarbonato de sódio no tratamento de vinhaça em AnSBBR operado a 55 e 35ºC Effect of the sodium bicarbonate in the treatment of vinasse in AnSBBR operated at 55 and 35ºC

    Directory of Open Access Journals (Sweden)

    Maria Magdalena Ribas Döll

    2010-09-01

    Full Text Available Avaliou-se a influência do bicarbonato de sódio (NaHCO3 no desempenho do reator anaeróbio batelada sequencial com biomassa imobilizada tratando vinhaça a 55 e a 35ºC. O reator foi preenchido com espuma de poliuretano e agitado a 300 rpm. A adaptação a 55ºC estendeu-se por 50 dias, tendo o reator sido alimentado com vinhaça (DQO de 0,3 a 1,0 g/L. Para a operação a 35ºC, procedeu-se inicialmente ao enriquecimento da população metanogênica, durante 21 dias, com substrato à base de etanol (2,5 gDQO/L. Posteriormente, cargas orgânicas volumétricas (COV de 0,85 a 5,70 gDQO/L.d foram aplicadas no reator a 55ºC, com suplementação de 1,2 a 0,4 gHCO3-/gDQO. A 35ºC, o reator foi submetido a COV de 2,85 a 36,0 gDQO/L.d com 0,4 a 0,2 gHCO3-/gDQO. A remoção de DQO variou de 43 a 78% a 55ºC e de 75 a 85% a 35ºC. A suplementação de alcalinidade mostrou-se essencial para a estabilidade do processo, sendo requerida em menor quantidade a 35ºC.The influence of the sodium bicarbonate (NaHCO3 on the performance of an anaerobic sequencing batch biofilm reactor treating vinasse at 55 and 35ºC was evaluated. The reactor was filled with polyurethane foam and agitated at 300 rpm. The acclimatization period at 55ºC lasted 50 days, and the reactor was fed with vinasse (COD from 0.3 to 1.0 g/L. A previous enrichment of methanogenic population was provided for the reactor operated at 35ºC, feeding it with an ethanol based substrate (2.5 gCOD/L during 21 days. Further on, organic loading rates (OLR ranging from 0.85 to 5.70 gCOD/L.d were applied to the reactor at 55ºC, supplemented with 1.2 to 0.4 gHCO3-/gCOD. At 35ºC the reactor was subjected to OLR ranging from 2.85 to 36.0 gCOD/L.d with 0.4 to 0.2 gHCO3-/gCOD. COD removal ranged from 43 to 78% at 55ºC and from 75 to 85% at 35ºC. Alkalinity supplementation was found to be essential for process stability, but the amount required was lower at 35ºC.

  1. Nuclear power plant transients: where are we

    International Nuclear Information System (INIS)

    Majumdar, D.

    1984-05-01

    This document is in part a postconference review and summary of the American Nuclear Society sponsored Anticipated and Abnormal Plant Transients in Light Water Reactors Conference held in Jackson, Wyoming, September 26-29, 1983, and in part a reflection upon the issues of plant transients and their impact on the viability of nuclear power. This document discusses state-of-the-art knowledge, deficiencies, and future directions in the plant transients area as seen through this conference. It describes briefly what was reported in this conference, emphasizes areas where it is felt there is confidence in the nuclear industry, and also discusses where the experts did not have a consensus. Areas covered in the document include major issues in operational transients, transient management, transient events experience base, the status of the analytical tools and their capabilities, probabilistic risk assessment applications in operational transients, and human factors impact on plant transients management

  2. Numerical solution of transient viscoelastic flow

    DEFF Research Database (Denmark)

    Hassager, Ole; Rasmussen, Henrik K.; Szabo, Peter

    1996-01-01

    A number of applications of the Lagrangina kinematic specification in the simulation of transient viscoelastic flows are shown.......A number of applications of the Lagrangina kinematic specification in the simulation of transient viscoelastic flows are shown....

  3. Fast thermal transients on valve

    International Nuclear Information System (INIS)

    Ferjancic, M.; Stok, B.; Halilovic, M.; Koc, P.; Mole, N.; Otrin, Z.; Kotar, A.

    2007-01-01

    One of the regulatory body methods to supervise nuclear safety of a nuclear power plant is a review of plant modifications and evaluation of their impact on plant operating experience. The Slovenian Nuclear Safety Administration (SNSA) licensed in April 2003 the use of leak-before-break (LBB) methodology in the Krsko NPP for the primary loop including surge line and connecting pipelines with minimal diameter of 6 inch. The SNSA decision based also on fracture mechanics analyses that include direct pipe failure mechanisms such as water hammer, creep damage, erosion and corrosion, fatigue and environmental conditions over the entire life of the plant. The evaluation of the operating transients pointed out, that presumed loadings, used for the LBB analysis, did not incorporate all the fast thermal transients data. For that purpose the SNSA requested Faculty of Mechanical Engineering (FS) in Ljubljana to perform additional analyses. The results of the analysis shall confirm the validity of the LBB analysis. (author)

  4. Towards traceable transient pressure metrology

    Science.gov (United States)

    Hanson, Edward; Olson, Douglas A.; Liu, Haijun; Ahmed, Zeeshan; Douglass, Kevin O.

    2018-04-01

    We describe our progress in developing the infrastructure for traceable transient measurements of pressure. Towards that end, we have built and characterized a dual diaphragm shock tube that allows us to achieve shock amplitude reproducibility of approximately 2.3% for shocks with Mach speeds ranging from 1.26–1.5. In this proof-of-concept study we use our shock tube to characterize the dynamic response of photonic sensors embedded in polydimethylsiloxane (PDMS), a material of choice for soft tissue phantoms. Our results indicate that the PDMS-embedded photonic sensors response to shock evolves over a tens to hundreds of microseconds time scale making it a useful system for studying transient pressures in soft tissue.

  5. Nonlinear Diffusion and Transient Osmosis

    International Nuclear Information System (INIS)

    Igarashi, Akira; Rondoni, Lamberto; Botrugno, Antonio; Pizzi, Marco

    2011-01-01

    We investigate both analytically and numerically the concentration dynamics of a solution in two containers connected by a narrow and short channel, in which diffusion obeys a porous medium equation. We also consider the variation of the pressure in the containers due to the flow of matter in the channel. In particular, we identify a phenomenon, which depends on the transport of matter across nano-porous membranes, which we call ''transient osmosis . We find that nonlinear diffusion of the porous medium equation type allows numerous different osmotic-like phenomena, which are not present in the case of ordinary Fickian diffusion. Experimental results suggest one possible candidate for transiently osmotic processes. (electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics)

  6. Anaerobic treatment of wastewater from coffee pulping in upflow anaerobic sludge blanquet (UASB) in two stages; Tratamento anaerobio de aguas residuarias do beneficiamento de cafe por via umida em reatores UASB em dois estagios

    Energy Technology Data Exchange (ETDEWEB)

    Bruno, Marcelo [UNESP, Jaboticabal, SP (Brazil). Microbiologia Agropecuaria; Oliveira, Roberto A. de [UNESP, Jaboticabal, SP (Brazil). Dept. de Engenharia Rural]. E-mail: raoder@fcav.unesp.br

    2008-04-15

    In this work, it was evaluated the efficiency of two stage up flow anaerobic sludge blanquet (UASB) reactors, in bench scale, treating a liquid effluent from the coffee pulping, submitted to hydraulic detention time (HDT) of 4.0; 5.2 and 6.2 days, resulting in organic loading rate (OLR) of 5.8; 3.6 and 3.0 g COD (L d)-1 in the first reactor (R1) and HDT of 2.0; 2.6 and 3.1 days with OLR of 5.8; 0.5 and 0.4 g DQO total (L d){sup -1} in the second reactor (R2). The medium values of total COD affluent varied from 15,440 to 23,040 mg O{sub 2} L{sup -1}. The medium values of removal efficiencies of total COD and TSS varied from 66 to 98% and 93 to 97%, respectively, in the system of treatment with the UASB reactors in two stages. The content of methane in the biogas varied from 69 to 89% in the R1 and from 52 to 73% in the R2. The maximum volumetric methane production of 0.708 L CH{sub 4} (L reactor d)-1 was obtained with OLR of 3.6 g total COD (L reactor d){sup -1} and HDT of 6.2 days in the R1. Average p H values ranged from 4.7 to 7.7 and 4.9 to 8.0 in the effluents of R1 and R2, respectively. Total volatile acids concentrations was kept below 100 mg L{sup -1} with HDT of 5.2 and 6.2 days in the R1 and HDT of 2.6 and 3.1 days in the R2. The medium values of total phenols of affluent ranged from 80 to 97 mg L-1 and the average removal efficiencies ranged from 72 to 90% in the UASB reactors in two stages. (author)

  7. Physicochemical characterization of sludge obtained in a UASB reactor: influence on the energetic utilization in the pyrolysis process; Caracterizacao fisico-quimica de lodo obtido em um reator UASB: influencia no aproveitamento energetico em processo de pirolise

    Energy Technology Data Exchange (ETDEWEB)

    Carvalho, Murillo Barros de [Universidade Federal do Tocantins (UFT), Palmas, TO (Brazil)], Email: murillopur@yahoo.com.br; Vieira, Glaucia Eliza Gama; Cardoso, Aderlanio da Silva; Silveira, Dyego Amaral; Figueiredo, Radson Lima [Universidade Federal do Tocantins (LEDBIO/UFT), Palmas, TO (Brazil). Lab. de Ensaios e Desenvolvimento de Biomassas e Biocombustiveis

    2010-07-01

    In biological treatment processes of domestic sewer it leaves of the organic matter is converted and another is absorbed being part of the microbial biomass denominated generic of mud biological or secondary composed mainly of biological solids, and that for that reason can also be denominated of sewage sludge. To give a maintainable final destiny for that residue has been one of the great challenges of the sanitation in the last years. Great part of that material is destined unproductive some are incinerated, others are disposed in sanitary embankments. This work had as objective the physiochemical characterization of the digested sludge, virgin and free from oxide of calcium (CaO), produced in the reactor UASB, of ETE Vila Uniao located in the city of Palmas-TO, for the destination as raw material for energy use in pyrolysis process. The collected sample was taken drought and stabilized to be analyzed at the laboratory LEDBIO/UFT where they were studied the particle, tenor of ashes, humidity and volatile density and sequential extraction for soxhlet. Found in the biomass loud tenor of volatile (56,72%), carbon fastens low (5,21%) and a considerable tenor of ashes (32,78%), what suggests that that sludge, in agreement with the comparisons of the literature, can obtain good incomes in pyrolysis process, especially incomes in bio-oil and coal. (author)

  8. Study of power peak migration due to insertion of control bars in a PWR reactor; Estudo da migracao do pico de potencia em funcao da insercao das barras de controle em um reator refrigerado a agua

    Energy Technology Data Exchange (ETDEWEB)

    Affonso, Renato Raoni Werneck; Costa, Danilo Leite; Borges, Diogo da Silva; Lava, Deise Diana; Lima, Zelmo Rodrigues de; Moreira, Maria de Lourdes, E-mail: raoniwa@yahoo.com.br, E-mail: danilolc26@gmail.com, E-mail: diogosb@outlook.com, E-mail: deisedy@gmail.com, E-mail: zrlima@ien.gov.br, E-mail: malu@ien.gov.br [Instituto de Engenharia Nuclear (IEN/CNEN-RJ), Rio de Janeiro, RJ (Brazil)

    2014-07-01

    This paper aims to present a study on the power distribution behavior in a PWR reactor, considering the intensity and the migration of power peaks as is the insertion of control rods in the core banks. For this, the study of the diffusion of neutrons in the reactor was adopted by computer simulation that uses the finite difference method for numerically solving the neutron diffusion equation to two energy groups in steady state and in symmetry of a fourth quarter core. We decided to add the EPRI-9R 3D benchmark thermal-hydraulic parameters of a typical power PWR. With a new configuration for the reactor, the positions of the control rods banks were also modified. Due to the new positioning of these banks in the reactor, there was intense power gradients, favoring the occurrence of critical situations and logically unconventional for operation of a nuclear reactor. However, these facts have led interesting times for the study on the power distribution behavior in the reactor, showing axial migration of power peaks and mainly the effect of the geometry of the core on the latter. Based on the distribution of power was evident the increase of the power in elements located in the central region of the reactor core and, concomitantly, the reduction in elements of its periphery. Of course, the behavior exhibited by the simulated reactor is not in agreement with that expected in an actual reactor, where the insertion of control rods banks should lead to reduced power throughout the core as evenly as possible, avoiding sharp power peaks, standardizing the burning fuel, controlling reactivity deviations and acting in reactor shutdown.

  9. Transient pseudohypoparathyroidism and neonatal seizure.

    Science.gov (United States)

    Manzar, S

    2001-04-01

    The case of a neonate is presented who had late onset seizure associated with hypocalcemia, hyperphosphatemia, and raised parathyroid hormone. The infant did not have any stigmata of pseudohypoparathyroidism. The hypocalcemia was initially resistant to calcium therapy, but responded to vitamin D analog therapy. The diagnosis of 'transient neonatal pseudohypoparathyroidism' was entertained, as the infant remained stable and seizure-free with normal serum biochemistry during 8 months of follow-up.

  10. Transient cognitive changes after craniotomy.

    Science.gov (United States)

    Hannegan, L

    1989-06-01

    Little has been written on the subject of cognitive and behavioral changes that may follow craniotomy. Neuroscience nurses who care for craniotomy patients often see transient alterations in behavior, intellect and personality similar to those occurring after minor head injury or subarachnoid hemorrhage. These changes may lead to depression and alter family dynamics. Interventional strategies, including cognitive screening, family counseling and thorough discharge planning are essential for helping patients and family members anticipate potential deficits and cope with life after craniotomy.

  11. Cortical computations via transient attractors.

    Directory of Open Access Journals (Sweden)

    Oliver L C Rourke

    Full Text Available The ability of sensory networks to transiently store information on the scale of seconds can confer many advantages in processing time-varying stimuli. How a network could store information on such intermediate time scales, between typical neurophysiological time scales and those of long-term memory, is typically attributed to persistent neural activity. An alternative mechanism which might allow for such information storage is through temporary modifications to the neural connectivity which decay on the same second-long time scale as the underlying memories. Earlier work that has explored this method has done so by emphasizing one attractor from a limited, pre-defined set. Here, we describe an alternative, a Transient Attractor network, which can learn any pattern presented to it, store several simultaneously, and robustly recall them on demand using targeted probes in a manner reminiscent of Hopfield networks. We hypothesize that such functionality could be usefully embedded within sensory cortex, and allow for a flexibly-gated short-term memory, as well as conferring the ability of the network to perform automatic de-noising, and separation of input signals into distinct perceptual objects. We demonstrate that the stored information can be refreshed to extend storage time, is not sensitive to noise in the system, and can be turned on or off by simple neuromodulation. The diverse capabilities of transient attractors, as well as their resemblance to many features observed in sensory cortex, suggest the possibility that their actions might underlie neural processing in many sensory areas.

  12. A transient absorption study of allophycocyanin

    Indian Academy of Sciences (India)

    Transient dynamics of allophycocyanin trimers and monomers are observed by using the pump-probe, transient absorption technique. The origin of spectral components of the transient absorption spectra is discussed in terms of both kinetics and spectroscopy. We find that the energy gap between the ground and excited ...

  13. Uso de fotorreatores UV para a remoção de diclofenaco, bezafibrato e etinilestradiol de esgoto tratado em sistema UASB-FBP

    Directory of Open Access Journals (Sweden)

    Eros de Faria

    2015-09-01

    Full Text Available RESUMOEste trabalho avaliou a remoção de diclofenaco (DCF, bezafibrato (BZF e etinilestradiol (EE2 de efluentes de sistema UASB-FBP (reator anaeróbio de manta de lodo seguido de filtro biológico percolador em fotorreatores UV de lâmpadas imersas (FRI e emersas (FRE. Os resultados mostram que baixa eficiência de remoção de tais compostos foi obtida em ambos fotorreatores quando se utilizou baixo tempo de contato (~10 min e baixa concentração inicial de fármacos (0,5 µg.L-1 para EE2, e 21 µg.L-1 para DCF e BZF. O aumento da concentração inicial de DCF (para 20 mg.L-1 e do tempo de contato (para 20 min resultaram em aumento da eficiência de remoção (de 31 para 83% no FRI e de 36 para 86% no FRE, indicando que compostos dissolvidos presentes no efluente biológico afetaram adversamente a remoção de fármacos nos fotorreatores devido a competição pela radiação UV incidente.

  14. SUPPLEMENT: "LOCALIZATION AND BROADBAND FOLLOW-UP OF THE GRAVITATIONAL-WAVE TRANSIENT GW150914" (2016, ApJL, 826, L13)

    NARCIS (Netherlands)

    Abbott, B. P.; Abbott, R.; Abbott, T. D.; Abernathy, M. R.; Acernese, F.; Ackley, K.; Adams, C.; Phythian-Adams, A.T.; Addesso, P.; Adhikari, R. X.; Adya, V. B.; Affeldt, C.; Agathos, M.; Agatsuma, K.; Aggarwal, N.T.; Aguiar, O. D.; Aiello, L.; Ain, A.; Ajith, P.; Allen, B.; Allocca, A.; Altin, P. A.; Anderson, S. B.; Anderson, W. G.; Arai, K.; Araya, M. C.; Arceneaux, C. C.; Areeda, J. S.; Arnaud, N.; Arun, K. G.; Ascenzi, S.; Ashton, G.; Ast, M.; Aston, S. M.; Astone, P.; Aufmuth, P.; Aulbert, C.; Babak, S.; Bacon, P.; Bader, M. K. M.; Baker, P. T.; Baldaccini, F.; Ballardin, G.; Ballmer, S. W.; Barayoga, J. C.; Barclay, S. E.; Barish, B. C.; Barker, R.D.; Barone, F.; Barr, B.; Barsotti, L.; Barsuglia, M.; Barta, D.; Barthelmy, S.; Bartlett, J.; Bartos, I.; Bassiri, R.; Basti, A.; Batch, J. C.; Baune, C.; Bavigadda, V.; Bazzan, M.; Behnke, B.; Bejger, M.; Bell, A. S.; Bell, C. J.; Berger, B. K.; Bergman, J.; Bergmann, G.; Berry, C. P. L.; Bersanetti, D.; Bertolini, A.; Betzwieser, J.; Bhagwat, S.; Bhandare, R.; Bilenko, I. A.; Billingsley, G.; Birch, M.J.; Birney, R.; Biscans, S.; Bisht, A.; Bitossi, M.; Biwer, C.; Bizouard, M. A.; Blackburn, J. K.; Blair, C. D.; Blair, D. G.; Blair, R. M.; Bloemen, A.L.S.; Bock, O.; Bodiya, T. P.; Boer, M.; Bogaert, J.G.; Bogan, C.; Bohe, A.; Bojtos, P.; Bond, T.C; Bondu, F.; Bonnand, R.; Boom, B. A.; Bork, R.; Boschi, V.; Bose, S.; Bouffanais, Y.; Bozzi, A.; Bradaschia, C.; Brady, P. R.; Braginsky, V. B.; Branchesi, M.; Brau, J. E.; Briant, T.; Brillet, A.; Brinkmann, M.; Brisson, V.; Brockill, P.; Brooks, A. F.; Brown, A.D.; Brown, D.; Brown, N. M.; Buchanan, C. C.; Buikema, A.; Bulik, T.; Bulten, H. J.; Buonanno, A.; Buskulic, D.; Buy, C.; Byer, R. L.; Cadonati, L.; Cagnoli, G.; Cahillane, C.; Bustillo, J. Calderon; Callister, T. A.; Calloni, E.; Camp, J. B.; Cannon, K. C.; Cao, J.; Capano, C. D.; Capocasa, E.; Carbognani, F.; Caride, S.; Diaz, J. Casanueva; Casentini, C.; Caudill, S.; Cavaglia, M.; Cavalier, F.; Cavalieri, R.; Cella, G.; Cepeda, C. B.; Baiardi, L. Cerboni; Cerretani, G.; Cesarini, E.; Chakraborty, R.; Chalermsongsak, T.; Chamberlin, S. J.; Chan, M.; Chao, D. S.; Charlton, P.; Chassande-Mottin, E.; Chen, H. Y.; Chen, Y; Cheng, C.; Chincarini, A.; Chiummo, A.; Cho, H. S.; Cho, M.; Chow, J. H.; Christensen, N.; Chu, Qian; Chua, S. E.; Chung, E.S.; Ciani, G.; Clara, F.; Clark, J. A.; Cleva, F.; Coccia, E.; Cohadon, P. -F.; Colla, A.; Collette, C. G.; Cominsky, L.; Constancio, M., Jr.; Conte, A.; Conti, L.; Cook, D.; Corbitt, T. R.; Cornish, N.; Corsi, A.; Cortese, S.; Costa, A.C.; Coughlin, M. W.; Coughlin, S. B.; Coulon, J. -P.; Countryman, S. T.; Couvares, P.; Cowan, E. E.; Coward, D. M.; Cowart, M. J.; Coyne, D. C.; Coyne, R.; Craig, K.; Creighton, J. D. E.; Cripe, J.; Crowder, S. G.; Cumming, A.; Cunningham, A.L.; Cuoco, E.; Dal Canton, T.; Danilishin, S. L.; D'Antonio, S.; Danzmann, K.; Darman, N. S.; Dattilo, V.; Dave, I.; Daveloza, H. P.; Davier, M.; Davies, G. S.; Daw, E. J.; Day, R.; Debra, D.; Debreczeni, G.; Degallaix, J.; De laurentis, M.; Deleglise, S.; Del Pozzo, W.; Denker, T.; Dent, T.; Dereli, H.; Dergachev, V.A.; DeRosa, R. T.; Rosa, R.; DeSalvo, R.; Dhurandhar, S.; Diaz, M. C.; Di Fiore, L.; Giovanni, M.G.; Di Lieto, A.; Di Pace, S.; Di Palma, I.; Di Virgilio, A.; Dojcinoski, G.; Dolique, V.; Donovan, F.; Dooley, K. L.; Doravari, S.; Douglas, R.; Downes, T. P.; Drago, M.; Drever, R. W. P.; Driggers, J. C.; Du, Z.; Ducrot, M.; Dwyer, S. E.; Edo, T. B.; Edwards, M. C.; Effler, A.; Eggenstein, H. -B.; Ehrens, P.; Eichholz, J.; Eikenberry, S. S.; Engels, W.; Essick, R. C.; Etzel, T.; Evans, T. M.; Evans, T. M.; Everett, R.; Factourovich, M.; Fafone, V.; Fair, H.; Fairhurst, S.; Fan, X.M.; Fang, Q.; Farinon, S.; Farr, B.; Farr, W. M.; Favata, M.; Fays, M.; Fehrmann, H.; Fejer, M. M.; Ferrante, I.; Ferreira, E. C.; Ferrini, F.; Fidecaro, F.; Fiori, I.; Fiorucci, D.; Fisher, R. P.; Flaminio, R.; Fletcher, M; Fournier, J. -D.; Franco, S; Frasca, S.; Frasconi, F.; Frei, Z.; Freise, A.; Frey, R.; Frey, V.; Fricke, T. T.; Fritschel, P.; Frolov, V. V.; Fulda, P.; Fyffe, M.; Gabbard, H. A. G.; Gair, J. R.; Gammaitoni, L.; Gaonkar, S. G.; Garufi, F.; Gatto, A.; Gaur, G.; Gehrels, N.; Gemme, G.; Gendre, B.; Genin, E.; Gennai, A.; George, J.; Gergely, L.; Germain, V.; Ghosh, A.; Ghosh, S.; Giaime, J. A.; Giardina, K. D.; Giazotto, A.; Gill, K.P.; Glaefke, A.; Goetz, E.; Goetz, R.; Gondan, L.; Gonzalez, Idelmis G.; Castro, J. M. Gonzalez; Gopakumar, A.; Gordon, N. A.; Gorodetsky, M. L.; Gossan, S. E.; Lee-Gosselin, M.; Gouaty, R.; Graef, C.; Graff, P. B.; Granata, M.; Grant, A.; Gras, S.; Gray, C.M.; Greco, G.; Green, A. C.; Groot, P.; Grote, H.; Grunewald, S.; Guidi, G. M.; Guo, X.; Gupta, A.; Gupta, M. K.; Gushwa, K. E.; Gustafson, E. K.; Gustafson, R.; Hacker, J. J.; Buffoni-Hall, R.; Hall, E. D.; Hammond, G.L.; Haney, M.; Hanke, M. M.; Hanks, J.; Hanna, C.; Hannam, M. D.; Hanson, P.J.; Hardwick, T.; Haris, K.; Harms, J.; Harry, G. M.; Harry, I. W.; Hart, M. J.; Hartman, M. T.; Haster, C. -J.; Haughian, K.; Heidmann, A.; Heintze, M. C.; Heitmann, H.; Hello, P.; Hemming, G.; Hendry, M.; Heng, I. S.; Hennig, J.; Heptonstall, A. W.; Heurs, M.; Hild, S.; Hoak, D.; Hodge, K. A.; Hofman, D.; Hollitt, S. E.; Holt, K.; Holz, D. E.; Hopkins, P.; Hosken, D. J.; Hough, J.; Houston, E. A.; Howell, E. J.; Hu, Y. M.; Huang, S.; Huerta, E. A.; Huet, D.; Hughey, B.; Husa, S.; Huttner, S. H.; Huynh-Dinh, T.; Idrisy, A.; Indik, N.; Ingram, D. R.; Inta, R.; Isa, H. N.; Isac, J. -M.; Isi, M.; Islas, G.; Isogai, T.; Iyer, B. R.; Izumi, K.; Jacqmin, T.; Jang, D.H.; Jani, K.; Jaranowski, P.; Jawahar, S.; Jimenez-Forteza, F.; Johnson, W.; Jones, I.D.; Jones, R.; Jonker, R. J. G.; Ju, L.; Kalaghatgi, C. V.; Kalogera, V.; Kandhasamy, S.; Kang, G.H.; Kanner, J. 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J.; Steeghs, D.; Hjorth, J.; Fynbo, J.P.U.; Malesani, D.; Milvang-Jensen, B.; Watson, D.; Irwin, M.; Fernandez, G.C.; McMahon, R. G.; Banerji, M.; Gonzalez-Solares, E.; Schulze-Topphoff, U.; Postigo, A. de U.; Thoene, C. C.; Cano, Z.; Rosswog, S.

    This Supplement provides supporting material for Abbott et al. (2016a). We briefly summarize past electromagnetic (EM) follow-up efforts as well as the organization and policy of the current EM follow-up program. We compare the four probability sky maps produced for the gravitational-wave transient

  15. Supplement: “Localization And Broadband Follow-Up of the Gravitational-Wave Transient GW150914” (2016, Apjl, 826, L13)

    DEFF Research Database (Denmark)

    P. Abbott, B.; Abbott, R.; Abbott, T. D.

    2016-01-01

    This Supplement provides supporting material for Abbott et al. (2016a). We briefly summarize pastelectromagnetic (EM) follow-up efforts as well as the organization and policy of the current EM follow-upprogram. We compare the four probability sky maps produced for the gravitational-wave transient...

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    Directory of Open Access Journals (Sweden)

    Carpejane Ferreira Silva

    2013-02-01

    Full Text Available A frequência de equinos soro-reagentes para o vírus da Anemia Infecciosa Equina (AIE foi investigada, durante o ano de 2010, em 5615 animais originários de 209 municípios de três estados do nordeste do Brasil: Paraíba, Rio Grande do Norte e Ceará. Os soros foram examinados com o emprego do teste de imunodifusão em gel de ágar (IDGA produzido com o antígeno p26. Dos 5615 animais examinados, 151 (2,69% foram soropositivos. As proporções de animais reatores positivos por estado foram: Paraíba (2,86%, Rio Grande do Norte (1,29% e Ceará (3,10%. Tomando-se por base a menor proporção de resultados positivos encontrada no estado do Rio Grande do Norte, o estado da Paraíba apresentou uma odds ratio de 2,64 (IC 95% = 1,33-5,36; p = 0,004 e o Ceará de 2,87 (IC 95% = 1,48-5,71; p = 0,001. Na Paraíba houve o registro de animais soropositivos em todos os meses do ano, com frequência mínima (0,58% em julho e máxima (5,82% em junho; no Rio Grande do Norte de março a maio e de julho a novembro, com variação de 0% em janeiro, fevereiro, junho e dezembro a 3,61% em maio; e no Ceará em todos os meses com frequência mínima (1,10% em agosto e máxima (7,29% no mês de dezembro.

  17. Audiovisual integration of stimulus transients

    DEFF Research Database (Denmark)

    Andersen, Tobias; Mamassian, Pascal

    2008-01-01

    A change in sound intensity can facilitate luminance change detection. We found that this effect did not depend on whether sound intensity and luminance increased or decreased. In contrast, luminance identification was strongly influenced by the congruence of luminance and sound intensity change...... leaving only unsigned stimulus transients as the basis for audiovisual integration. Facilitation of luminance detection occurred even with varying audiovisual stimulus onset asynchrony and even when the sound lagged behind the luminance change by 75 ms supporting the interpretation that perceptual...... integration rather than a reduction of temporal uncertainty or effects of attention caused the effect....

  18. Fast Radio Bursts and Radio Transients from Black Hole Batteries

    Science.gov (United States)

    Mingarelli, Chiara M. F.; Levin, Janna; Lazio, T. Joseph W.

    2015-12-01

    Most black holes (BHs) will absorb a neutron star (NS) companion fully intact without tidal disruption, suggesting the pair will remain dark to telescopes. Even without tidal disruption, electromagnetic (EM) luminosity is generated from the battery phase of the binary when the BH interacts with the NS magnetic field. Originally, the luminosity was expected to be in high-energy X-rays or gamma-rays, however, we conjecture that some of the battery power is emitted in the radio bandwidth. While the luminosity and timescale are suggestive of fast radio bursts (FRBs; millisecond-scale radio transients) NS-BH coalescence rates are too low to make these a primary FRB source. Instead, we propose that the transients form a FRB sub-population, distinguishable by a double peak with a precursor. The rapid ramp-up in luminosity manifests as a precursor to the burst which is 20%-80% as luminous given 0.5 ms timing resolution. The main burst arises from the peak luminosity before the merger. The post-merger burst follows from the NS magnetic field migration to the BH, causing a shock. NS-BH pairs are especially desirable for ground-based gravitational wave (GW) observatories since the pair might not otherwise be detected, with EM counterparts greatly augmenting the scientific leverage beyond the GW signal. The EM signal’s ability to break degeneracies in the parameters encoded in the GW and probe the NS magnetic field strength is quite valuable, yielding insights into open problems in NS magnetic field decay.

  19. Transient analysis of space reactors

    International Nuclear Information System (INIS)

    Giap, H.Q.; Best, F.

    1985-01-01

    Nuclear reactors are being considered as the primary energy source for an increasing number of space missions including the National Aeronautics and Space Administration's space station and the Strategic Defense Initiative's SP-100. Conceptual reactor designs include fast and thermal spectrum reactors with liquid-metal or gas cooling delivering thermal energy to Brayton, Stirling, thermoelectric, thermoionic, or Rankine cycle power conversion systems. Almost all designs utilize a thermal radiator for waste heat rejection, although the radiator may assume such exotic forms as fans of liquid-metal droplets or metal filaments floating in free space. The reactor, power conversion, and heat rejection systems must operate in zero gravity, be uniformly small and lightweight, and utilize exotic materials compared with terrestrial technology. Therefore, the problems of system design and analysis are unique to space applications, and new analysis tools must be developed. With this motivation, the Transient Analysis of Space Reactors (TASR) computer code has been developed to predict system performance under steady-state and transient conditions. The SP-100 space reactor system, being designed by General Electric (GE) Company, was used as the test system for the TASR code. At full power, the SP-100 produces 110 kW(e) from 2.21 MW(t) via a thermoelectric conversion system

  20. Transient global amnesia: current perspectives

    Directory of Open Access Journals (Sweden)

    Spiegel DR

    2017-10-01

    Full Text Available David R Spiegel, Justin Smith, Ryan R Wade, Nithya Cherukuru, Aneel Ursani, Yuliya Dobruskina, Taylor Crist, Robert F Busch, Rahim M Dhanani, Nicholas Dreyer Department of Psychiatry and Behavioral Sciences, Eastern Virginia Medical School, Norfolk, VA, USA Abstract: Transient global amnesia (TGA is a clinical syndrome characterized by the sudden onset of an extraordinarily large reduction of anterograde and a somewhat milder reduction of retrograde episodic long-term memory. Additionally, executive functions are described as diminished. Although it is suggested that various factors, such as migraine, focal ischemia, venous flow abnormalities, and epileptic phenomena, are involved in the pathophysiology and differential diagnosis of TGA, the factors triggering the emergence of these lesions are still elusive. Recent data suggest that the vulnerability of CA1 neurons to metabolic stress plays a pivotal part in the pathophysiological cascade, leading to an impairment of hippocampal function during TGA. In this review, we discuss clinical aspects, new imaging findings, and recent clinical–epidemiological data with regard to the phenotype, functional anatomy, and putative cellular mechanisms of TGA. Keywords: transient global amnesia, vascular, migraines, psychiatric

  1. PRISMATIC CORE COUPLED TRANSIENT BENCHMARK

    Energy Technology Data Exchange (ETDEWEB)

    J. Ortensi; M.A. Pope; G. Strydom; R.S. Sen; M.D. DeHart; H.D. Gougar; C. Ellis; A. Baxter; V. Seker; T.J. Downar; K. Vierow; K. Ivanov

    2011-06-01

    The Prismatic Modular Reactor (PMR) is one of the High Temperature Reactor (HTR) design concepts that have existed for some time. Several prismatic units have operated in the world (DRAGON, Fort St. Vrain, Peach Bottom) and one unit is still in operation (HTTR). The deterministic neutronics and thermal-fluids transient analysis tools and methods currently available for the design and analysis of PMRs have lagged behind the state of the art compared to LWR reactor technologies. This has motivated the development of more accurate and efficient tools for the design and safety evaluations of the PMR. In addition to the work invested in new methods, it is essential to develop appropriate benchmarks to verify and validate the new methods in computer codes. The purpose of this benchmark is to establish a well-defined problem, based on a common given set of data, to compare methods and tools in core simulation and thermal hydraulics analysis with a specific focus on transient events. The benchmark-working group is currently seeking OECD/NEA sponsorship. This benchmark is being pursued and is heavily based on the success of the PBMR-400 exercise.

  2. A COMETHE version with transient capability

    International Nuclear Information System (INIS)

    Vliet, J. van; Lebon, G.; Mathieu, P.

    1980-01-01

    A version of the COMETHE code is under development to simulate transient situations. This paper focuses on some aspects of the transient heat transfer models. Initially the coupling between transient heat transfer and other thermomechanical models is discussed. An estimation of the thermal characteristic times shows that the cladding temperatures are often in quasi-steady state. In order to reduce the computing time, calculations are therefore switched from a transient to a quasi-static numerical procedure as soon as such a quasi-equilibrium is detected. The temperature calculation is performed by use of the Lebon-Lambermont restricted variational principle, with piecewise polynoms as trial functions. The method has been checked by comparison with some exact results and yields good agreement for transient as well as for quasi-static situations. This method therefore provides a valuable tool for the simulation of the transient behaviour of nuclear reactor fuel rods. (orig.)

  3. Instrument response during overpower transients at TREAT

    International Nuclear Information System (INIS)

    Meek, C.C.; Bauer, T.H.; Hill, D.J.; Froehle, P.H.; Klickman, A.E.; Tylka, J.P.; Doerner, R.C.; Wright, A.E.

    1982-01-01

    A program to empirically analyze data residuals or noise to determine instrument response that occurs during in-pile transient tests is out-lined. As an example, thermocouple response in the Mark III loop during a severe overpower transient in TREAT is studied both in frequency space and in real-time. Time intervals studied included both constant power and burst portions of the power transient. Thermocouple time constants were computed. Benefits and limitations of the method are discussed

  4. OPTICAL TRANSIENT DETECTOR (OTD) LIGHTNING V1

    Data.gov (United States)

    National Aeronautics and Space Administration — The Optical Transient Detector (OTD) records optical measurements of global lightning events in the daytime and nighttime. The data includes individual point...

  5. Electromagnetic Transients in Power Cables

    DEFF Research Database (Denmark)

    Silva, Filipe Faria Da; Bak, Claus Leth

    for this information in Ph.D. theses and scientific papers. To finish the chapter, we study short-circuits in cables, which can be rather different from short-circuit in OHLs, because of the current returning in the screen. The screen can also be bonded on different configurations, influencing both the magnitude...... of the short-circuit current and of the transient recovery voltage. Chapter 5, ‘‘System Modelling and Harmonics’’, starts by proposing a method that can be used when deciding how much of the network to model when doing a simulation of an energisation/restrike together with the possible limitations...... demonstrates how analytical analysis of simple systems can be made. These principles will be used in later chapters in the study of more complex scenarios. Chapter 3, ‘‘Travelling Waves and Modal Domain’’, reviews the Telegraph equations and how to calculate the loop and series impedance matrices as well...

  6. Transient ischemic attack: diagnostic evaluation.

    Science.gov (United States)

    Messé, Steven R; Jauch, Edward C

    2008-08-01

    A transient ischemic attack portends significant risk of a stroke. Consequently, the diagnostic evaluation in the emergency department is focused on identifying high-risk causes so that preventive strategies can be implemented. The evaluation consists of a facilitated evaluation of the patient's metabolic, cardiac, and neurovascular systems. At a minimum, the following tests are recommended: fingerstick glucose level, electrolyte levels, CBC count, urinalysis, and coagulation studies; noncontrast computed tomography (CT) of the head; electrocardiography; and continuous telemetry monitoring. Vascular imaging studies, such as carotid ultrasonography, CT angiography, or magnetic resonance angiography, should be performed on an urgent basis and prioritized according to the patient's risk stratification for disease. Consideration should be given for echocardiography if no large vessel abnormality is identified.

  7. Transient photoconductivity in amorphous semiconductors

    International Nuclear Information System (INIS)

    Mpawenayo, P.

    1997-07-01

    Localized states in amorphous semiconductors are divided in disorder induced shallow trap levels and dangling bonds deep states. Dangling bonds are assumed here to be either neutral or charged and their energy distribution is a single gaussian. Here, it is shown analytically that transient photocurrent in amorphous semiconductors is fully controlled by charge carriers transitions between localized states for one part and tunneling hopping carriers on the other. Localized dangling bonds deep states act as non radiative recombination centres, while hopping tunnelling is assisted by the Coulomb interaction between defects sites. The half-width of defects distribution is the disorder parameter that determines the carrier hopping time between defects sites. The macroscopic time that explains the long decay response times observed will all types of amorphous semiconductors is duly thought to be temperature dependent. Basic equations developed by Longeaud and Kleider are solved for the general case of a semiconductor after photo-generation. It turns out that the transient photoconductivity decay has two components; one with short response times from carriers trap-release transitions between shallow levels and extended states and a hopping component made of inter-dependent exponentials whose time constants span in larger ranges depending on disorder. The photoconductivity hopping component appears as an additional term to be added to photocurrents derived from existing models. The results of the present study explain and complete the power law decay derived in the multiple trapping models developed 20 years ago only in the approximation of the short response time regime. The long response time regime is described by the hopping macroscopic time. The present model is verified for all samples of amorphous semiconductors known so far. Finally, it is proposed to improved the modulated photoconductivity calculation techniques by including the long-lasting hopping dark documents

  8. DETERMINATION OF THE TRANSIENT CHARACTERISTICS OF A PH ELECTROCHEMICAL ANALYSER: METROLOGICAL QUALIFICATION

    OpenAIRE

    ELCIO CRUZ DE OLIVEIRA

    2001-01-01

    Os medidores de pH existentes no mercado indicam valores confiáveis, dentro de uma incerteza declarada para cada modelo fabricado. Entretanto, normalmente, não é citada a especificação em termos do tempo necessário para alcançar estes valores, devido ao tempo de resposta do instrumento. Esta dissertação de mestrado tem como objetivo desenvolver uma metodologia teórico-experimental para avaliar o desempenho do transdutor em condições transientes, indicando alguns ...

  9. Modelagem, simulação e analise de reatores continuos para a hidrolise enzimatica de bagaço de cana

    OpenAIRE

    Arturo Gonzalez Quiroga

    2009-01-01

    Resumo: Por mais de um século, a principal fonte de combustível e produtos químicos para a sociedade humana tem vindo a partir de recursos fósseis, os quais são limitados e estão concentrados em poucas regiões do mundo. Biomassa, como a única fonte de carbono renovável, mostra-se promissora para a produção de combustíveis e produtos químicos em grande escala. Na última década, a produção de bioetanol a partir de biomassa lignocelulósica através de hidrólise enzimática tem sido estudada intens...

  10. PRESENCE OF HELMINTH EGGS IN SEWAGE SLUDGE FROM CAMPO GRANDE (MS, BRAZIL MUNICIPALITY AFTER ANAEROBIC TREATMENT LEVANTAMENTO DE OVOS DE HELMINTOS EM LODO DE ESGOTO ORIUNDO DE CAMPO GRANDE (MS APÓS TRATAMENTO ANAERÓBICO

    Directory of Open Access Journals (Sweden)

    Juliana Rosa Carrijo

    2008-04-01

    Full Text Available The present study was conducted to evaluate the helminth eggs presence in sewage sludge, previously treated in anerobic digestion process like anaerobic liquid fluid reactor. First of all were evaluated different kinds of materials to choose the best filter which permitted to filter the <em>Taenia saginata em>eggs. The filter that showed better adaptation was the fine toilet paper one sheet. The helminth eggs were classified for their genera, according to their morphology. The <em>Taenia> sp, <em>Trichuris>, <em>Dipylidium> and <em>Strongyloides> were find only in one collect. The number of nematode eggs prevailed on the cestodes. The quantity of helminths eggs found was variable, indicatting complementary treatments process to the sewage sludge. It was concluded that the filter tested was efficient to <em>Taenia> sp eggs and to other helminth eggs present in sewage sludge. KEY WORDS: Biossolid, filter, <em>Taenia> sp. O presente trabalho avaliou a presença de ovos de helmintos em lodo de esgoto, previamente tratado em sistema de digestão anaeróbia do tipo reator anaeróbio de lodo fluidizado (RALF. Primeiramente testaram-se diferentes tipos de materiais para a escolha do filtro que possibilitasse a passagem de ovos de <em>Taenia saginataem>. O filtro mais adequado foi o papel higiênico fino, folha única. Classificaram-se os ovos de helmintos por gênero, de acordo com sua morfologia. Encontraram-se ovos de <em>Taenia> sp, <em>Trichuris>, <em>Dipylidium> e <em>Strongyloides

  11. Modelo para simulação digital à freqüência industrial de compensadores estáticos do tipo reator controlado a tiristores

    OpenAIRE

    Silveira, Julio César; Camacho, José Roberto

    1988-01-01

    Levando-se em conta a crescente utilização dos compensadores estáticos de potencia reativa nos sistemas de potencia este trabalho apresenta alguns aspectos básicos do modelamento e simulação digital, de compensador estático a tiristores (RCT). Apresentado resultados da variação de parâmetros do próprio compensador e de características do sistema de potencia.

  12. Encapsulamento do Dióxido de Titânio (TiO2 pela Técnica de Polimerização em Emulsão

    Directory of Open Access Journals (Sweden)

    Oliveira Adriano M.

    2002-01-01

    Full Text Available Este trabalho apresenta uma metodologia de encapsulamento do TiO2 pela técnica de polimerização em emulsão. O pigmento foi previamente modificado por um titanato em heptano. O titanato usado foi o tri-isoestearato iso-propoxi de titânio, que reage com os grupos hidroxilas da superfície do TiO2. O pigmento modificado foi encapsulado por metacrilato de metila (MMA, usando persulfato de amônio como iniciador e dodecil sulfato de sódio (SDS como emulsificante. A reação de encapsulamento foi conduzida em um reator de vidro encamisado, utilizando dois processos de polimerização diferentes: batelada e semi-contínuo. A caracterização do pigmento modificado foi feita pela técnica de Infravermelho com Transformada de Fourier (FTIR. Os rendimentos das reações de modificação e de encapsulamento foram determinados pela técnica de Análise Termogravimétrica (TGA.

  13. Asiago spectroscopic classification of 3 transients

    Science.gov (United States)

    Tomasella, L.; Benetti, S.; Cappellaro, E.; Turatto, M.

    2018-01-01

    The Asiago Transient Classification Program (Tomasella et al. 2014, AN, 335, 841) reports the spectroscopic classification of AT 2018eq discovered by R. Belligoli (ISSP) in the direction of M31; PS18bq (AT2018bi) discovered by J. Grzegorzek and Pan-STARRS1 in UGC1791; and AT2018C (= Gaia18aak), a blue hostless transient discovered by Gaia.

  14. Plasma transport studies using transient techniques

    International Nuclear Information System (INIS)

    Simonen, T.C.; Brower, D.L.; Efthimion, P.

    1991-01-01

    Selected topics from the Transient Transport sessions of the Transport Task Force Workshop, held February 19-23, 1990, in Hilton Head, South Carolina are summarized. Presentations on sawtooth propagation, ECH modulation, particle modulation, and H-mode transitions are included. The research results presented indicated a growing theoretical understanding and experimental sophistication in the application of transient techniques to transport studies. (Author)

  15. The LOFAR Transients Key Science Project

    NARCIS (Netherlands)

    Stappers, B.; Fender, R.; Wijers, R.

    2009-01-01

    The Transients Key Science Project (TKP) is one of six Key Science Projects of the next generation radio telescope LOFAR. Its aim is the study of transient and variable low-frequency radio sources with an extremely broad science case ranging from relativistic jet sources to pulsars, exoplanets,

  16. Transient characteristics observed in TRACY supercritical experiments

    International Nuclear Information System (INIS)

    Yamane, Yuichi; Nakajima, Ken; Ogawa, Kazuhiko; Aizawa, Eiju; Yanagisawa, Hiroshi; Miyoshi, Yoshinori

    2003-01-01

    A series of supercritical experiments has been performed using the transient experiment criticality facility, TRACY, and some transient characteristics of low-enriched uranyl nitrate solution have been observed. The peak power and the number of fissions have been measured with three types of reactivity insertion method. The data useful for the evaluation of criticality safety for reprocessing plants were obtained. (author)

  17. High energy transients: The millisecond domain

    Indian Academy of Sciences (India)

    A. R. RAO

    2018-02-09

    Feb 9, 2018 ... The search for high energy transients in the millisecond domain has come to the focus in recent ... ulation of transients in the high energy domain with .... The ATLAS col- laboration reported a object called ATLAS17aeu: a fading optical object from the same general direction as GW170104. This object was ...

  18. Machine Learning for Zwicky Transient Facility

    Science.gov (United States)

    Mahabal, Ashish; Zwicky Transient Facility, Catalina Real-Time Transient Survey

    2018-01-01

    The Zwicky Transient Facility (ZTF) will operate from 2018 to 2020 covering the accessible sky with its large 47 square degree camera. The transient detection rate is expected to be about a million per night. ZTF is thus a perfect LSST prototype. The big difference is that all of the ZTF transients can be followed up by 4- to 8-m class telescopes. Given the large numbers, using human scanners for separating the genuine transients from artifacts is out of question. For that first step as well as for classifying the transients with minimal follow-up requires machine learning. We describe the tools and plans to take on this task using follow-up facilities, and knowledge gained from archival datasets.

  19. Nuclear reactors transients identification and classification system

    International Nuclear Information System (INIS)

    Bianchi, Paulo Henrique

    2008-01-01

    This work describes the study and test of a system capable to identify and classify transients in thermo-hydraulic systems, using a neural network technique of the self-organizing maps (SOM) type, with the objective of implanting it on the new generations of nuclear reactors. The technique developed in this work consists on the use of multiple networks to do the classification and identification of the transient states, being each network a specialist at one respective transient of the system, that compete with each other using the quantization error, that is a measure given by this type of neural network. This technique showed very promising characteristics that allow the development of new functionalities in future projects. One of these characteristics consists on the potential of each network, besides responding what transient is in course, could give additional information about that transient. (author)

  20. Transient Neurological Symptoms after Spinal Anesthesia

    Directory of Open Access Journals (Sweden)

    Zehra Hatipoglu

    2013-02-01

    Full Text Available Lidocaine has been used for more than 50 years for spinal anesthesia and has a remarkable safety record. In 1993, a new adverse effect, transient neurologic toxicity was described in patients recovering from spinal anesthesia with lidocaine. Transient neurological symptoms have been defined as pain in the lower extremities (buttocks, thighs and legs after an uncomplicated spinal anesthesia and after an initial full recovery during the immediate postoperative period (less than 24 h. The incidence of transient neurological symptoms reported in prospective, randomized trials varies from 4% to 37%. The etiology of transient neurological symptoms remains unkonwn. Despite the transient nature of this syndrome, it has proven to be difficult to treat effectively. Drug or some interventional therapy may be necessary. [Archives Medical Review Journal 2013; 22(1.000: 33-44

  1. Clinical applications of transient elastography

    Directory of Open Access Journals (Sweden)

    Kyu Sik Jung

    2012-06-01

    Full Text Available Chronic liver disease represents a major public health problem, accounting for significant morbidity and mortality worldwide. As prognosis and management depend mainly on the amount and progression of liver fibrosis, accurate quantification of liver fibrosis is essential for therapeutic decision-making and follow-up of chronic liver diseases. Even though liver biopsy is the gold standard for evaluation of liver fibrosis, non-invasive methods that could substitute for invasive procedures have been investigated during past decades. Transient elastography (TE, FibroScan® is a novel non-invasive method for assessment of liver fibrosis with chronic liver disease. TE can be performed in the outpatient clinic with immediate results and excellent reproducibility. Its diagnostic accuracy for assessment of liver fibrosis has been demonstrated in patients with chronic viral hepatitis; as a result, unnecessary liver biopsy could be avoided in some patients. Moreover, due to its excellent patient acceptance, TE could be used for monitoring disease progression or predicting development of liver-related complications. This review aims at discussing the usefulness of TE in clinical practice.

  2. Avaliação das concentrações de metano gerado em um biorreator de bancada com base em parâmetros físico-químicos

    Directory of Open Access Journals (Sweden)

    Natalí Acioly de Luna Ferreira

    Full Text Available RESUMO O monitoramento do metano (CH4 gerado em biorreatores permite avaliar o desenvolvimento da biodegradação anaeróbia dos resíduos sólidos orgânicos (RSO. O objetivo deste artigo foi avaliar as interposições ocasionadas por fatores físico-químicos nas concentrações de metano gerado em um biorreator de bancada preenchido com RSO provenientes de uma escola da cidade de Campina Grande (PB, Brasil. A metodologia empregada na pesquisa consistiu na confecção e instrumentação de um biorreator de bancada de 0,03 m3 de capacidade, no qual foi realizado o monitoramento das concentrações de metano, análise microbiológica e dos parâmetros físico-químicos durante um período de 355 dias. A partir da análise dos resultados, foi constatado que o pH esteve acima de 7,0 durante a maior parte do monitoramento, indicando que a alcalinidade apresentada pelo material utilizado no preenchimento do biorreator foi suficiente para impedir que o acúmulo de ácidos voláteis ocorrido na fase inicial do monitoramento acarretasse a desestabilização do sistema. Dessa forma, foi possível concluir que os parâmetros físico-químicos analisados contribuíram de forma satisfatória para a biodegradação dos resíduos, levando em consideração que as concentrações de metano atingiram os níveis esperados para esse tipo de reator, chegando a valores próximos a 60%.

  3. Proposta de um método de cálculo do tempo de sedimentação no tratamento de esgotos por lodos ativados em bateladas Proposal of a calculation method to determine the settling time in batch activated sludge sewage treatment

    Directory of Open Access Journals (Sweden)

    Rafael Carvalho de Oliveira Santos

    2005-09-01

    Full Text Available Neste artigo é feita uma análise do funcionamento de reatores biológicos para tratamento de esgotos pelo processo de lodos ativados, em batelada. A análise destaca o ciclo de operação desses reatores, que inclui as etapas de aeração e sedimentação, indicando o tempo de sedimentação para o qual se obtém a máxima eficiência operacional. É apresentado um método de cálculo para a determinação racional deste tempo ótimo. O trabalho contém uma revisão da literatura concernente ao assunto estudado, com ênfase nos conceitos de sedimentação zonal e fluxo de sólidos, acompanhada da dedução do método de cálculo proposto.This paper presents an analysis of the operation of activated sludge sequencing batch reactors (SBR for sewage treatment. Emphasis is placed on the operational cycle of those reactors, which includes the phases of aeration and sedimentation, indicating the settling time corresponding to the maximum operational efficiency. An explanation is made of a calculation method to determine this optimum settling time. The work includes a review of the literature concerning the subject of the present study, considering the concepts of hindered (zone settling and solids flux, together with the derivation of the proposed calculation method.

  4. Transient analysis capabilities at ABB-CE

    International Nuclear Information System (INIS)

    Kling, C.L.

    1992-01-01

    The transient capabilities at ABB-Combustion Engineering (ABB-CE) Nuclear Power are a function of the computer hardware and related network used, the computer software that has evolved over the years, and the commercial technical exchange agreements with other related organizations and customers. ABB-CEA is changing from a mainframe/personal computer network to a distributed workstation/personal computer local area network. The paper discusses computer hardware, mainframe computing, personal computers, mainframe/personal computer networks, workstations, transient analysis computer software, design/operation transient analysis codes, safety (licensed) analysis codes, cooperation with ABB-Atom, and customer support

  5. Transient phenomena in electrical power systems

    CERN Document Server

    Venikov, V A; Higinbotham, W

    1964-01-01

    Electronics and Instrumentation, Volume 24: Transient Phenomena in Electrical Power Systems presents the methods for calculating the stability and the transient behavior of systems with forced excitation control. This book provides information pertinent to the analysis of transient phenomena in electro-mechanical systems.Organized into five chapters, this volume begins with an overview of the principal requirements in an excitation system. This text then explains the electromagnetic and electro-mechanical phenomena, taking into account the mutual action between the components of the system. Ot

  6. Transient burnout in flow reduction condition

    International Nuclear Information System (INIS)

    Iwamura, Takamichi; Kuroyanagi, Toshiyuki

    1981-01-01

    A transient flow reduction burnout experiment was conducted with water in a uniformly heated, vertically oriented tube. Test pressures ranged from 0.5 to 3.9 MPa. An analytical method was developed to obtain transient burnout conditions at the exit. A simple correlation to predict the deviation of the transient burnout mass velocity at the tube exit from the steady state mass velocity obtained as a function of steam-water density ratio and flow reduction rate. The correlation was also compared with the other data. (author)

  7. Transient myocardial ischemia after myocardial infarction

    DEFF Research Database (Denmark)

    Mickley, H

    1995-01-01

    the prevalence of ambulatory or transient myocardial ischemia is lower than in patients with chronic, stable coronary artery disease. A greater proportion of ischemic episodes, however, are silent than in other subgroups with ischemic heart disease. Early after the infarction, transient myocardial ischemia...... exhibits a circadian variation with a peak activity occurring in the late evening hours. Patients with non-Q wave infarction have more transient myocardial ischemia, whereas thrombolytic therapy seems to result in less residual ischemia. Exercise testing is more sensitive than ambulatory monitoring...

  8. Characterizing SI Engine Transient Fuel Consumption in ALPHA

    Science.gov (United States)

    Examine typical transient engine operation encountered over the EPA's vehicle and engine testing drive cycles to characterize that transient fuel usage, and then describe the changes made to ALPHA to better model transient engine operation.

  9. Reference Gene Selection in the Desert Plant <em>Eremosparton songoricuem>m>

    Directory of Open Access Journals (Sweden)

    Dao-Yuan Zhang

    2012-06-01

    Full Text Available <em>Eremosparton songoricum em>(Litv. Vass. (<em>E. songoricumem> is a rare and extremely drought-tolerant desert plant that holds promise as a model organism for the identification of genes associated with water deficit stress. Here, we cloned and evaluated the expression of eight candidate reference genes using quantitative real-time reverse transcriptase polymerase chain reactions. The expression of these candidate reference genes was analyzed in a diverse set of 20 samples including various <em>E. songoricumem> plant tissues exposed to multiple environmental stresses. GeNorm analysis indicated that expression stability varied between the reference genes in the different experimental conditions, but the two most stable reference genes were sufficient for normalization in most conditions.<em> EsEFem> and <em>Esα-TUB> were sufficient for various stress conditions, <em>EsEF> and <em>EsACT> were suitable for samples of differing germination stages, and <em>EsGAPDH>and <em>Es>UBQ em>were most stable across multiple adult tissue samples. The <em>Es18Sem> gene was unsuitable as a reference gene in our analysis. In addition, the expression level of the drought-stress related transcription factor <em>EsDREB2em>> em>verified the utility of<em> E. songoricumem> reference genes and indicated that no single gene was adequate for normalization on its own. This is the first systematic report on the selection of reference genes in <em>E. songoricumem>, and these data will facilitate future work on gene expression in this species.

  10. RFSP simulations of Darlington FINCH refuelling transient

    International Nuclear Information System (INIS)

    Carruthers, E.V.; Chow, H.C.

    1997-01-01

    Immediately after refuelling of a channel, the fresh bundles are free of fission products. Xenon-135, the most notable of the saturating fission products, builds up to an equilibrium level in about 30 h. The channel power of the refuelled channel would therefore initially peak and then drop to a steady-state level. The RFSP code can track saturating-fission-product transients and power transients. The Fully INstrumented CHannels (FINCHs) in Darlington NGS provides channel power data on the refuelling power transients. In this paper, such data has been used to identify the physical evidence of the fission-product transient effect on channel power, and to validate RFSP fission-product-driver calculation results. (author)

  11. Hybrid Hydrostatic/Transient Roller Bearing Assembly

    Science.gov (United States)

    Justak, John F.

    1992-01-01

    Proposed bearing assembly for shaft of high-speed turbopump includes both hydrostatic and rolling-element bearings. Rolling-element bearing unloaded at high speed by centrifugal expansion of outer race and transient retainer.

  12. The economic impact of reactor transients

    International Nuclear Information System (INIS)

    Rossin, A.D.; Vine, G.L.

    1984-01-01

    This chapter discusses the cost estimation of transients and the causal relationship between transients and accidents. It is suggested that the calculation of the actual cost of a transient that has occurred is impossible without computerized records. Six months of operating experience reports, based on a survey of pressurized water reactors (PWRs) and boiling water reactors (BWRs) conducted by the Nuclear Safety Analysis Center (NSAC), are analyzed. The significant costs of a reactor transient are the repair costs resulting from severe damage to plant equipment, the cost of scrams (the actions the system is designed to take to avoid safety risks), US NRC fines, negative publicity, utility rates and revenues. It is estimated that the Three Mile Island-2 accident cost the US over $100 billion in nuclear plant delays and cancellations, more expensive fuel, oil imports, backfits, bureaucratic, administrative and legal costs, and lost productivity

  13. Transient effects on stimulated Brillouin scattering

    International Nuclear Information System (INIS)

    Faris, G.W.; Dyer, M.J.; Hickman, A.P.

    1992-01-01

    We present a detailed comparison of theory and experiment for transient stimulated Brillouin scattering for a pump pulse with Gaussian temporal profile. A new approach for measuring Brillouin linewidths is demonstrated, and an unexplained asymmetry is observed

  14. Detection of Transient Signals in Doppler Spectra

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Signal processing is used to detect transient signals in the presence of noise. Two embodiments are disclosed. In both embodiments, the time series from a remote...

  15. Monitorização ambulatorial da pressão arterial em indivíduos com resposta exagerada dos níveis pressóricos em esforço. Influência do condicionamento físico Ambulatory blood pressure monitoring in individuals with exaggerated blood pressure response to exercise, influence of exercise training

    Directory of Open Access Journals (Sweden)

    Eliudem Galvão Lima

    1998-04-01

    Full Text Available OBJETIVO: Avaliar em indivíduos hiper-reatores ao teste ergométrico (TE, a influência de um programa regular de exercícios sobre os parâmetros ergométricos e da MAPA. MÉTODOS: Estudaram-se 22 indivíduos (44±1 anos, sedentários, assintomáticos, normotensos e que apresentavam elevação exagerada da pressão sistólica (PAS >220mmHg durante o TE, divididos, através de amostragem casual simples, em dois grupos: grupo hiper-reator sedentário (GHS e grupo hiper-reator condicionado (GHC. Os indivíduos do GHS foram orientados a não realizar qualquer tipo de exercício físico regular durante o período de 4 meses e o GHC composto de 10 indivíduos submetidos a programa de condicionamento físico aeróbico durante o mesmo período. RESULTADOS: Um programa de exercícios aeróbicos de moderada intensidade não promove redução significativa dos níveis pressóricos durante a monitorização (P>0,05; mas, durante a realização do TE nesses indivíduos, verificamos redução (pPURPOSE: To evaluate the effects of exercise training on ergometric test and Ambulatory Blood Pressure Monitoring (ABPM in normotensive individuals with exaggerated blood pressure response to exercise. METHODS: We studied 22 sedentary and normotensive subjects (mean 44±1 years old showing an exaggerated systolic blood pressure response (SBP>220mmHg during a cycloergometric test. These individuals were divided in two groups: sedentary hyperreactive group (SHG and trained hyperreactive group (THG. The THG was submitted to a 4 month aerobic exercise training program. RESULTS: A program of moderate aerobic exercise did not reduce (P>0.05 ABPM blood pressure levels. However, in the submaximal loads of dynamic exercise we observed a significant fall in the SBP and heart rate (P<0.05. CONCLUSION: Normotensive individuals with exaggerated blood pressure response to dynamical exercise submitted to physical training presented a reduction in their systolic blood pressure and

  16. Influência do tipo de material suporte no desempenho de reatores biológicos de leito móvel na remoção de carbono e nitrificação de esgoto sanitário The influence of material support kind on the biological moving bed reactors performance used for the carbon removal and nitrification of sewage

    Directory of Open Access Journals (Sweden)

    Delmira Beatriz Wolff

    2010-06-01

    Full Text Available Neste trabalho foi mostrada a influência do tipo de material suporte: P4 (plástico reciclado rugoso, diâmetro médio de 2,31 mm, densidade de 900 kg.m-3, superfície específica potencial de 2.596 m².m-3sup e P5 (polietileno, pouco rugoso, forma cilíndrica, diâmetro médio de 10 mm, densidade de 880 kg.m-3, superfície específica potencial de 3.075m².m-³sup utilizados em dois reatores biológicos de leito móvel, fluxo contínuo, na remoção de carbono e nitrificação de esgoto sanitário, os quais foram divididos em duas fases, de acordo com a idade do lodo (IL: fase A: IL de 10 dias e fase B: IL de 3 dias. Foram aplicadas cargas orgânicas superficiais médias de 4,0 kgDQO.m-2.d-1 (P4 e de 4,1 kgDQO.m-2.d-1 (P5; e cargas superficiais de nitrogênio de 0,63 kgN.m-2.d-1 (P5 e de 0,66 kgN.m-2.d-1 (P5. Para o material P4, a remoção média foi de 87% de carbono e 83% de nitrogênio (fase A e 80% de carbono e 77% de nitrogênio (fase B. Para o P5, remoção de 63% de carbono e 55% de nitrogênio (Fase A e 59% de carbono e de nitrogênio (fase B. Com base nos resultados obtidos, verificou-se que a remoção de carbono e nitrogênio não foi influenciada pela idade do lodo, mas pelo tipo de material suporte (forma ou características de superfície e superfície disponível para o crescimento da biomassa.This paper presented the influence of material support kind: P4 (rugous recycled plastic, medium diameter of 2.31 mm, density of 900 kg.m-3, specific surface potential of 2,596 m².m-3sup and P5 (polietilene, cilindric shape, medium diameter of 10 mm, density of 880 kg.m-3, specific surface potential of 3,075m².m-3sup used in two continuous flux biological moving bed reactors using different material support to remove nitrogen and carbon from sewage, which was divided in two phases according to sludge retention time (SRT: phase A: SRT of 10 days and phase B: SRT of 3 days. The organic loading rates applied were 4.0 kgCOD.m-2.d-1 (P4 and

  17. Estudo experimental de aspectos hidrodinâmicos e da partida de um reator anaeróbio sequencial tratando esgotos domésticos

    Directory of Open Access Journals (Sweden)

    Camila Fernandes Nunes

    2009-12-01

    Full Text Available It is important to provide individual sanitation systems for sewage peri-urban communities or rural areas to minimize impacts on the environment and human health caused by sewage discharge in natura into water resources. In this context, the anaerobic digestion of effluent has been one of the main considered technologies due to easy implementation, material minimization and reduction in waste production. The objective of this work was to study a Baffled Anaerobic Reactor (BAR including its hydrodynamic characteristics, percentile of inoculum to be applied and reactor operation start. It was concluded that the flow is dispersed with 3.84% of dead spaces and that 20% of the cow manure provided best results; however, due to the high fiber content of the manure, its use is not recommended as inoculum. The BAR system, composed of four chambers, presented good performance for sewage treatment of a rural community in terms of organic substance removal (COD, turbidity and solids meeting effluent disposal standards of these parameters considering the Federal and Minas Gerais State legislation, in Brazil, even in a transient phase of operation, at temperatures below 20°C. However, the effluents from the BAR can’t be released into water bodies without other parameters such as nitrogen, phosphorus, fecal coliforms, and others are investigated to be conforming to those standards.

  18. Atucha I nuclear power plant transients analysis

    International Nuclear Information System (INIS)

    Castano, J.; Schivo, M.

    1987-01-01

    A program for the transients simulation thermohydraulic calculation without loss of coolant (KWU-ENACE development) to evaluate Atucha I nuclear power plant behaviour is used. The program includes systems simulation and nuclear power plants control bonds with real parameters. The calculation results show a good agreement with the output 'protocol' of various transients of the nuclear power plant, keeping the error, in general, lesser than ± 10% from the variation of the nuclear power plant's state variables. (Author)

  19. Cable system transients theory, modeling and simulation

    CERN Document Server

    Ametani, Akihiro; Nagaoka, Naoto

    2015-01-01

    A systematic and comprehensive introduction to electromagnetic transient in cable systems, written by the internationally renowned pioneer in this field Presents a systematic and comprehensive introduction to electromagnetic transient in cable systems Written by the internationally renowned pioneer in the field Thorough coverage of the state of the art on the topic, presented in a well-organized, logical style, from fundamentals and practical applications A companion website is available

  20. Modeling of Transients in an Enrichment Circuit

    International Nuclear Information System (INIS)

    Fernandino, Maria; Delmastro, Dario; Brasnarof, Daniel

    2003-01-01

    In the present work a mathematical model is presented in order to describe the dynamic behavior inside a closed enrichment loop, the latter representing a single stage of an uranium gaseous diffusion enrichment cascade.The analytical model is turned into a numerical model, and implemented through a computational code.Transients of two species separation were numerically analyzed, including setting times of each magnitude, behavior of each one of them during different transients, and redistribution of concentrations along the closed loop

  1. The transient ladder synchronization of chaotic systems

    International Nuclear Information System (INIS)

    Chen, H.-K.; Sheu, L.-J.

    2006-01-01

    A new type for chaotically synchronizing systems, transient ladder chaos synchronization, is proposed in this Letter. For some physical systems, chaotic synchronization is possible in only some of the variables. It is shown that, for the non-synchronizing variable, synchronization up to a constant difference for t 1 = 2 is possible. The transient ladder chaos synchronization and anti-synchronization are illustrated by using two identical chaotic Froude pendulums. Numerical simulations are shown for demonstration

  2. Transient diabetes insipidus in pregnancy

    Science.gov (United States)

    Gunawardana, Kavinga; Grossman, Ashley

    2015-01-01

    Summary Gestational diabetes insipidus (DI) is a rare complication of pregnancy, usually developing in the third trimester and remitting spontaneously 4–6 weeks post-partum. It is mainly caused by excessive vasopressinase activity, an enzyme expressed by placental trophoblasts which metabolises arginine vasopressin (AVP). Its diagnosis is challenging, and the treatment requires desmopressin. A 38-year-old Chinese woman was referred in the 37th week of her first single-gestation due to polyuria, nocturia and polydipsia. She was known to have gestational diabetes mellitus diagnosed in the second trimester, well-controlled with diet. Her medical history was unremarkable. Physical examination demonstrated decreased skin turgor; her blood pressure was 102/63 mmHg, heart rate 78 beats/min and weight 53 kg (BMI 22.6 kg/m2). Laboratory data revealed low urine osmolality 89 mOsmol/kg (350–1000), serum osmolality 293 mOsmol/kg (278–295), serum sodium 144 mmol/l (135–145), potassium 4.1 mmol/l (3.5–5.0), urea 2.2 mmol/l (2.5–6.7), glucose 3.5 mmol/l and HbA1c 5.3%. Bilirubin, alanine transaminase, alkaline phosphatase and full blood count were normal. The patient was started on desmopressin with improvement in her symptoms, and normalisation of serum and urine osmolality (280 and 310 mOsmol/kg respectively). A fetus was delivered at the 39th week without major problems. After delivery, desmopressin was stopped and she had no further evidence of polyuria, polydipsia or nocturia. Her sodium, serum/urine osmolality at 12-weeks post-partum were normal. A pituitary magnetic resonance imaging (MRI) revealed the neurohypophyseal T1-bright spot situated ectopically, with a normal adenohypophysis and infundibulum. She remains clinically well, currently breastfeeding, and off all medication. This case illustrates some challenges in the diagnosis and management of transient gestational DI. Learning points Gestational DI is a rare complication of

  3. Transient diabetes insipidus in pregnancy.

    Science.gov (United States)

    Marques, Pedro; Gunawardana, Kavinga; Grossman, Ashley

    2015-01-01

    Gestational diabetes insipidus (DI) is a rare complication of pregnancy, usually developing in the third trimester and remitting spontaneously 4-6 weeks post-partum. It is mainly caused by excessive vasopressinase activity, an enzyme expressed by placental trophoblasts which metabolises arginine vasopressin (AVP). Its diagnosis is challenging, and the treatment requires desmopressin. A 38-year-old Chinese woman was referred in the 37th week of her first single-gestation due to polyuria, nocturia and polydipsia. She was known to have gestational diabetes mellitus diagnosed in the second trimester, well-controlled with diet. Her medical history was unremarkable. Physical examination demonstrated decreased skin turgor; her blood pressure was 102/63 mmHg, heart rate 78 beats/min and weight 53 kg (BMI 22.6 kg/m(2)). Laboratory data revealed low urine osmolality 89 mOsmol/kg (350-1000), serum osmolality 293 mOsmol/kg (278-295), serum sodium 144 mmol/l (135-145), potassium 4.1 mmol/l (3.5-5.0), urea 2.2 mmol/l (2.5-6.7), glucose 3.5 mmol/l and HbA1c 5.3%. Bilirubin, alanine transaminase, alkaline phosphatase and full blood count were normal. The patient was started on desmopressin with improvement in her symptoms, and normalisation of serum and urine osmolality (280 and 310 mOsmol/kg respectively). A fetus was delivered at the 39th week without major problems. After delivery, desmopressin was stopped and she had no further evidence of polyuria, polydipsia or nocturia. Her sodium, serum/urine osmolality at 12-weeks post-partum were normal. A pituitary magnetic resonance imaging (MRI) revealed the neurohypophyseal T1-bright spot situated ectopically, with a normal adenohypophysis and infundibulum. She remains clinically well, currently breastfeeding, and off all medication. This case illustrates some challenges in the diagnosis and management of transient gestational DI. Gestational DI is a rare complication of pregnancy occurring in two to four out of

  4. Evaluation of the fuel rod integrity in PWR reactors from the spectrometric analysis of the primary coolant; Avaliacao da integridade de varetas combustiveis em reatores PWR a partir da analise espectrometrica da agua do primario

    Energy Technology Data Exchange (ETDEWEB)

    Monteiro, Iara Arraes

    1999-02-15

    The main objective of this thesis is to provide a better comprehension of the phenomena involved in the transport of fission products, from the fuel rod to the coolant of a PWR reactor. To achieve this purpose, several steps were followed. Firstly, it was presented a description of the fuel elements and the main mechanisms of fuel rod failure, indicating the most important nuclides and their transport mechanisms. Secondly, taking both the kinetic and diffusion models for the transport of fission products as a basis, a simple analytical and semi-empirical model was developed. This model was also based on theoretical considerations and measurements of coolant's activity, according to internationally adopted methodologies. Several factors are considered in the modelling procedures: intrinsic factors to the reactor itself, factors which depend on the reactor's operational mode, isotope characteristic factors, and factors which depend on the type of rod failure. The model was applied for different reactor's operational parameters in the presence of failed rods. The main conclusions drawn from the analysis of the model's output are relative to the variation on the coolant's water activity with the fuel burnup, the linear operation power and the primary purification rate and to the different behaviour of iodine and noble gases. The model was saturated from a certain failure size and showed to be unable to distinguish between a single big fail and many small ones. (author)

  5. Particle Swarm Optimization applied to combinatorial problem aiming the fuel recharge problem solution in a nuclear reactor; Particle swarm optimization aplicado ao problema combinatorio com vistas a solucao do problema de recarga em um reator nuclear

    Energy Technology Data Exchange (ETDEWEB)

    Meneses, Anderson Alvarenga de Moura; Schirru, Roberto [Universidade Federal, Rio de Janeiro, RJ (Brazil). Coordenacao dos Programas de Pos-graduacao de Engenharia. Programa de Engenharia Nuclear]. E-mail: ameneses@con.ufrj.br; schirru@lmp.ufrj.br

    2005-07-01

    This work focuses on the usage the Artificial Intelligence technique Particle Swarm Optimization (PSO) to optimize the fuel recharge at a nuclear reactor. This is a combinatorial problem, in which the search of the best feasible solution is done by minimizing a specific objective function. However, in this first moment it is possible to compare the fuel recharge problem with the Traveling Salesman Problem (TSP), since both of them are combinatorial, with one advantage: the evaluation of the TSP objective function is much more simple. Thus, the proposed methods have been applied to two TSPs: Oliver 30 and Rykel 48. In 1995, KENNEDY and EBERHART presented the PSO technique to optimize non-linear continued functions. Recently some PSO models for discrete search spaces have been developed for combinatorial optimization. Although all of them having different formulation from the ones presented here. In this paper, we use the PSO theory associated with to the Random Keys (RK)model, used in some optimizations with Genetic Algorithms. The Particle Swarm Optimization with Random Keys (PSORK) results from this association, which combines PSO and RK. The adaptations and changings in the PSO aim to allow the usage of the PSO at the nuclear fuel recharge. This work shows the PSORK being applied to the proposed combinatorial problem and the obtained results. (author)

  6. Production of bioenergy in anaerobic baffled reactor (ABR) and sludge blanket (UASB) in the treatment os swine waste water; Producao de bioenergia em reatores anaerobios compartimentado (RAC) e de manta de lodo (UASB) no tratamento de efluentes de suinocultura

    Energy Technology Data Exchange (ETDEWEB)

    Moterani, Fabricio; Pereira, Erlon Lopes; Campos, Claudio M.M. [Universidade Federal de Lavras (DEG/UFLA), MG (Brazil). Dept. de Engenharia], email: fabricio_moterani@yahoo.com.br

    2011-07-01

    The biogas is obtained in the processes of degradation of organic matter by the action of bacterial consortium in the environment. The aim of this study was to evaluate the biogas production in anaerobic UASB and ABR in swine wastewater treatment. For this we used the theoretical estimated and actual production of biogas measured by anaerobic gasometers installed in the units. Methane was determined by gas chromatography (GC) and its theoretical output was 66 LCH4 kgSVT d{sup -1} and 11.9 LCH4 kgSVT d{sup -1} and 24.7 m{sup 3} d{sup -1} and 5.4 m{sup 3} d{sup -1} to ABR and UASB, respectively. Regarding the actual production of biogas in the reactor provided by the gas tank, found the values of 1,166.4 m{sup 3}; 0.1 m{sup 3}; 27.4 m{sup 3} and 12,598.5 m{sup 3} of biogas for compartments 1, 2 and 3 and ABR for the UASB reactor, respectively, totaling, production of 13,792.4 m{sup 3} in the units together, with an average of 113 m{sup 3} of biogas per day. But, it concludes with this research that the use of effluent from produce energy through biogas in swine farming is effective, which can be used in rural productive system itself. (author)

  7. Essays of leaching in cemented products containing simulated waste from evaporator concentrated of PWR reactor; Ensaios de lixiviacao em produtos cimentados contendo rejeito simulado de concentrado do evaporador de reator PWR

    Energy Technology Data Exchange (ETDEWEB)

    Haucz, Maria Judite A.; Calabria, Jaqueline A. Almeida; Tello, Cledola Cassia O.; Candido, Francisco Donizete; Seles, Sandro Rogerio Novaes, E-mail: hauczmj@cdtn.b, E-mail: jaalmeida@cdtn.b, E-mail: tellocc@cdtn.b, E-mail: fdc@cdtn.b, E-mail: seless@cdtn.b [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte, MG (Brazil)

    2011-10-26

    This paper evaluated the results from leaching resistance essays of cemented products, prepared from three distinct formulations, containing simulated waste of concentrated from the PWR reactor evaporator. The leaching rate is a parameter of qualification of solidified products containing radioactive waste and is determined in accordance with regulation ISO 6961. This procedure evaluates the capacity of transfer organic and inorganic substances presents in the waste through dissolution in the extractor medium. For the case of radioactive waste it is reached the more retention of contaminants in the cemented product, i.e.the lesser value of lixiviation rate. Therefore, this work evaluated among the proposed formulation that one which attend the criterion established in the regulation CNEN-NN-6.09

  8. COD removal and biogas production at the manipueira treatment in anaerobic one-stage reactor with different supporting media; Remocao de DQO e producao de biogas no tratamento de manipueira em reator anaerobico monofasico com diferentes meios de suporte

    Energy Technology Data Exchange (ETDEWEB)

    Torres, Douglas Guedes Batista; Kunzler, Kathia Regina; Gomes, Simone Damasceno; Tavares, Maria Herminia Ferreira; Assis, Tatiane Martins de [Universidade Estadual do Oeste do Parana (UNIOESTE), PR (Brazil)], Emails: simoned@unioeste.br, mhstavar@certto.com.br

    2009-07-01

    This study aims at evaluating the efficiency for organic load removal and biogas production for the manipueira treatment in two anaerobic reactors using as supporting media bamboo rings and polyurethane. The manipueira loads added to the systems were 0.548, 1.156, 1.471 and 3.049 g COD/ L{sub reactorday}, gradually increased. With bamboo as supporting media, the load increasing carried the greatest biogas production, with 3.049 g COD/ L{sub reactorday}. Using polyurethane, the greatest production occurred with the 1.471 g CODL{sub reactorday} {sup -1}load. Therefore, it was shown that the supporting media use allowed greater loads and biogas productions, comparatively to the literature data. (author)

  9. Biogas and reduction of organic matter in anaerobic reactor with continuous flow means support; Producao de biogas e reducao de materia organica em reatores anaerobicos de fluxo continuo com meio suporte

    Energy Technology Data Exchange (ETDEWEB)

    Kunzler, Kathia Regina; Gomes, Simone Damasceno; Goncalves, Jefferson Luiz; Kuczman, Osvaldo [Universidade Estadual do Oeste do Parana (PGEAGRI/UNIOESTE), Cascavel, PR (Brazil). Programa de Pos-Graduacao em Engenharia Agricola], Emails: kathiark@yahoo.com.br, simoned@unioeste.br; Piana, Pitagoras Augusto [Universidade Estadual do Oeste do Parana (UNIOESTE), Toledo, PR (Brazil)

    2010-07-01

    Starch processing industries are to obtain cassava starch. Its main residue is the effluent resulting from pressing the roots, Manipueira, high organic load and toxic. In this study, we compared the removal efficiency of organic loading and biogas production in anaerobic reactors, with the support means bamboo in different relations width: height. The first lesion diameter of 15 cm and a length of 90 cm, a ratio 1:6 and the second with a diameter of 20 cm and 60 cm long, ratio of 1:3. The support medium consisted of rings of bamboo with 10 cm length and diameters between 1.7 and 2.5 cm. The loads applied were 0.519, 1.156, 1.471, 3.813, 4.347, 4.708 and 5.601gDQO/L.day. To evaluate the removal efficiency of organic matter, the samples were subjected to analysis of DQO biogas production was assessed in terms of organic load removed. Bamboo as a support allowed the application of higher loads. The higher efficiency in the production of biogas was produced in the reactor with the highest ratio width: height, being more significant for the organic load of 5, 601 gCOD/L.day, showing more stability this. (author)

  10. COD biological removal and biogas production in anaerobic reactor treating cassava wastewater industry; Remocao biologica de DQO e producao de biogas em reator anaerobio tratando efluente de fecularia de madioca

    Energy Technology Data Exchange (ETDEWEB)

    Watthier, Elisangela [Universidade Estadual do Oeste do Parana (UNIOESTE), Cascavel, PR (Brazil). Curso de Mestrado em Engenharia Agricola; Andreani, Cristiane Lurdes [Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq), Brasilia, DF (Brazil); Gomes, Simone Damasceno [Universidade Estadual do Oeste do Parana (PGEAGRI/UNIOESTE), Cascavel, PR (Brazil). Programa de Pos-Graduacao em Engenharia Agricola; Moreschi, Roberson; Rufino, Mauricio de Oliveira [Universidade Estadual do Oeste do Parana (UNIOESTE), Cascavel, PR (Brazil). Curso de Engenharia Agricola

    2010-07-01

    The effluent from the cassava industry cause damage to the environment if released without treatment. One alternative is the implementation of anaerobic reactors, which also add value through the production of biogas. The support means increases the contact surface of micro-organisms and enhance their setting. The purpose of this study was to evaluate the reduction of organic matter (DQO) and biogas production in a reactor of PVC with 90 cm long and 15 cm in diameter, through support rings of bamboo, 10 cm in length and diameter ranged from 1.7 to 2.5 cm, with a volume of 6 L. The organic loading used were 4,357, 4,708, 5,601 and 6,126 g DQO.L-1.day-1, corresponding to hydraulic retention time (TRH) of 3,5, 2,8, 3,25 and 2,7 days, respectively. It was observed that with the increase of organic load was increased production of biogas, the largest observed for a load of 6.126 g DQO.L-1.day-1 with an average of 9.146 L.day-1. Regarding the removal of organic matter were achieved values of 98.35, 99.09, 99.33 and 98.55% respectively for each load applied, with the highest efficiency observed in charge of 5.601 g COD. L-1. day-1, but without significant differences. (author)

  11. Thermal fluid dynamic behavior of coolant helium gas in a typical reactor VHTGR channel of prismatic core; Comportamento termofluidodinamico do gas refrigerante helio em um canal topico de reator VHTGR de nucleo prismatico

    Energy Technology Data Exchange (ETDEWEB)

    Belo, Allan Cavalcante

    2016-08-01

    The current studies about the thermal fluid dynamic behavior of the VHTGR core reactors of 4{sup th} generation are commonly developed in 3-D analysis in CFD (computational fluid dynamics), which often requires considerable time and complex mathematical calculations for carrying out these analysis. The purpose of this project is to achieve thermal fluid dynamic analysis of flow of gas helium refrigerant in a typical channel of VHTGR prismatic core reactor evaluating magnitudes of interest such as temperature, pressure and fluid velocity and temperature distribution in the wall of the coolant channel from the development of a computer code in MATLAB considering the flow on one-dimensional channel, thereby significantly reducing the processing time of calculations. The model uses three different references to the physical properties of helium: expressions given by the KTA (German committee of nuclear safety standards), the computational tool REFPROP and a set of constant values for the entire channel. With the use of these three references it is possible to simulate the flow treating the gas both compressible and incompressible. The results showed very close values for the interest quantities and revealed that there are no significant differences in the use of different references used in the project. Another important conclusion to be observed is the independence of helium in the gas compressibility effects on thermal fluid dynamic behavior. The study also indicated that the gas undergoes no severe effects due to high temperature variations in the channel, since this goes in the channel at 914 K and exits at approximately 1263 K, which shows the excellent use of helium as a refrigerant fluid in reactor channels VHTGR. The comparison of results obtained in this work with others in the literature served to confirm the effectiveness of the one-dimensional consideration of method of gas flow in the coolant channel to replace the models made in 3-D for the pressure range and temperature used in the project since the results obtained were almost the same in the same operating conditions. (author)

  12. DC electromagnetic pump applied to liquid metal flow control used in fast reactors; Bomba eletromagnetica de corrente continua aplicada ao controle de escoamento de metais liquidos utilizados em reatores rapidos

    Energy Technology Data Exchange (ETDEWEB)

    Borges, Eduardo M.; Braz Filho, Francisco A.; Guimaraes, Lamartine N.F. [Centro Tecnico Aeroespacial (CTA), Sao Jose dos Campos, SP (Brazil). Inst. de Estudos Avancados (IEAv)]. E-mail: Eduardo@ieav.cta.br; fbraz@ieav.cta.br; guimarae@ieav.cta.br

    2005-07-01

    Electromagnetic pumps use Faraday principle to liquid metal flow control, where DC electric current and magnetic field applied produce the Lorentz force on the liquid metal. In this paper the results of the computational simulation are compared to experimental data of Mercury DC electromagnetic pump operation and the BEMC-1 code is used to evaluation of DC electromagnetic pump performance applied to liquid metal flow control as Sodium, Lead and Bismuth, used in fast reactors. (author)

  13. Study of heat transfer in a eccentric fuel rods in a non stop planned shutdown of a PWR type reactor; Estudo da transferencia de calor em uma vareta combustivel excentrica, num desligamento nao planejado de um reator do tipo PWR

    Energy Technology Data Exchange (ETDEWEB)

    Affonso, Renato Raoni Werneck; Lava, Deise Diana; Borges, Diogo da Silva; Sampaio, Paulo Augusto Berquo de; Moreira, Maria de Lourdes, E-mail: raoniwa@yahoo.com.br, E-mail: deisedy@gmail.com, E-mail: diogosb@outlook.com, E-mail: sampaio@ien.gov.br, E-mail: malu@ien.gov.br [Instituto de Engenharia Nuclear (IEN/CNEN-RJ), Rio de Janeiro, RJ (Brazil)

    2014-07-01

    This paper aims to conduct a case study in which the fuel pellets are displaced related to the center coating. Therefore, it will be addressed, first, the verification of computer code, comparing the results obtained with analytical solutions. This check is important so that, at a time later, you can use the program to know the fuel rod behavior and coolant channel.

  14. Study of heat transfer in 3D fuel rods of the EPRI-9R reactor modified; Estudo da transferencia de calor em varetas combustiveis 3D do reator EPRI-9R 3D modificado

    Energy Technology Data Exchange (ETDEWEB)

    Affonso, Renato Raoni Werneck; Lava, Deise Diana; Borges, Diogo da Silva; Sampaio, Paulo Augusto Berquo de; Moreira, Maria de Lourdes, E-mail: raoniwa@yahoo.com.br, E-mail: deisedy@gmail.com, E-mail: diogosb@outlook.com, E-mail: sampaio@ien.gov.br, E-mail: malu@ien.gov.br [Instituto de Engenharia Nuclear (IEN/CNEN-RJ), Rio de Janeiro, RJ (Brazil)

    2014-07-01

    This paper aims to conduct a case study of the fuel rods that have the highest and the lowest average power of the EPRI-9R 3D reactor modified , for various positions of the control rods banks. For this, will be addressed the verification of computer code, comparing the results obtained with analytical solutions. This check is important so that, subsequently, it is possible use the program to understand the behavior of the fuel rods and the coolant channel of the EPRI-9R 3D reactor modified. Thus, in view of the scope of this paper, first a brief introducing on the heat transfer is done, including the rod equations and the equation of energy in the channel to allow the analysis of the results.

  15. Synthesis and characterization of tungsten carbide doped cobalt via gas-solid reaction in rotary bed reactor; Sintese e caracterizacao de carbeto de tungstenio dopado com cobalto via reacao gas-solido em reator de leito rotativo

    Energy Technology Data Exchange (ETDEWEB)

    Tertuliano, R.S.C.; Araujo, C.P.B. de; Frota, A.V.V.M.; Moriyama, A.L.L.; Souza, C.P. de, E-mail: ruasavio@hotmail.com [Universidade Federal do Rio Grande do Norte (UFRN), Natal, RN (Brazil). Departamento de Engenharia Quimica

    2016-07-01

    The search for materials with high added value, high applicability and sustainability, motivates innovations in all areas of engineering. In this context, so-called doped carbides, ceramic and metal compounds are included. This work proposes the synthesis and characterization of tungsten carbide doped cobalt (WC-Co) through the gas-solid reaction in a rotating bed reactor. The production stages of the material are: precursor synthesis by wetting, drying at 80 deg C, characterization of the precursor by MEV, DRX and FRX, gas-solid reaction at 750 deg C in a reducing atmosphere of CH{sub 4} / H{sub 2} in a rotary reactor at 34 rpm and characterization of the reaction product by the techniques already mentioned. The results showed that tungsten carbide powders were produced with cobalt inserted into the structure, with high surface area, nanometric grains and with potential for applications in the areas of catalysis, reactors and fuel cells, showing the relevance of this type of research.

  16. Validation of main nuclear libraries used in thorium reactors using the Serpent code; Validação das principais bibliotecas nucleares utilizadas em reatores de tório com o código Serpent

    Energy Technology Data Exchange (ETDEWEB)

    Faga, Lucas J., E-mail: lucas.faga@usp.br [Universidade de São Paulo (USP), SP (Brazil). Instituto de Física; Stefani, Giovanni L. de, E-mail: giovanni.stefani@ipen.br [Instituto de Pesquisas Energéticas e Nucleares (IPEN/CNEN-SP), São Paulo, SP (Brazil). Centro de Engenharia Nuclear; Santos, Thiago A. dos, E-mail: thiago.santos@ufabc.edu.br [Universidade Federal do ABC (UFABC), São Paulo, SP (Brazil)

    2017-07-01

    The purpose of this work is to validate the library of the Serpent standard database for systems containing U-233, U-235, Th-232, Pu-239 and Pu-240. The project will support the other projects of the newly created study group of Nuclear Engineering Center (CEN) of Instituto de Pesquisas Energéticas e Nucleares (IPEN), linked to the study of several types of reactors and their application in thorium cycles, a subject that gains more and more visibility, due to strong and potential promises of energy revolution. The results obtained at the end of the simulations were satisfactory, with the multiplication factors being effective close to 100 PCM of the values provided by the benchmarks, as expected for a validated library. The minimum distance between these values was 2 PCM and the maximum of 280 PCM. The final analysis demonstrates that the ENDF / B-VII library has validated nuclear data for the isotopes of interest and may be used in future thorium study group projects.

  17. Development of a protection system for research reactor based in Field Programmable Gate Array - FPGA; Desenvolvimento de sistema de protecao para reator nuclear de pesquisa baseado em Field Programmable Gate Array - FPGA

    Energy Technology Data Exchange (ETDEWEB)

    Martins, Roque Hudson da Silva

    2016-07-01

    This study presents a implementation purpose of a protection system for research nuclear reactors by using a programed device FPGA (Field Programmable Gate Array). As well as logic protection method involved on an automatic shutdown (TRIP) of a reactor, that ensure the security on such systems. These new control and operation mechanics are developed to guarantee that the security limits of a power plant are not exceeded, these mechanics can work isolated or in groups to safe guard the security levels. For this implementation to be completed, there will be presented the main aspects and concepts referred to protection systems, mostly about research nuclear reactors, with some applications terms exposed. The system proposed at this paper was developed following the VHDL (Very High Speed Integrated Circuits) hardware describing language, and the Modelsim software from Altera Software to program the automatic turning off routines, and hypothetical simulations for such. The results show that for every software application for supporting nuclear reactors, like security devices, they have to meet the IEC 60880 criteria. This paper have great importance, seeing that nuclear reactor security systems, are a basic element for ensure the reactor security. (author)

  18. Anaerobic digestion of cassava wastewater in fixed bed reactor using bamboo medium support; Digestao anaerobica de agua residuaria de fecularia em reator de leito fixo utilizando meio suporte de aneis de bambu

    Energy Technology Data Exchange (ETDEWEB)

    Watthier, Elisangela; Andreani, Cristiane L.; Silva, Jefferson L.G. [Universidade Estadual do Oeste do Parana (UNIOESTE), Cascavel, PR (Brazil)], E-mail: eliswa@hotmail.com; Gomes, Simone D. [Universidade Estadual do Oeste do Parana (UNIOESTE), Cascavel, PR (Brazil). Dept. de Recursos Hidricos e Saneamento Ambiental

    2012-11-01

    Cassava wastewater causes damage to the environment due to high organic loads and presence of cyanide and hydrocyanic acid. An alternative treatment anaerobic which add value for biogas production. To allow use of higher load sand reducing the TDH support means are used. This study aimed to evaluate the performance of the anaerobic treatment of liquid effluent of cassava industry, using bamboo as support media. The wastewater used was derived from starch factory located in Toledo. Was used PVC reactor with a diameter of 15 cm and length 90 cm. Were used as support means 52 bamboo rings and useful reactor volume 61. A total of 13 load increasing, from 1,675 to 15.158 g.L{sup -1}.d{sup -1}, until reaching the maximum load bearable. For each load data was collected for 15 days by daily samples at entrance and exit of the reactors. The samples were analyzed: DQO, alkalinity, volatile acidity and biogas production. There was a system instability in 12,394 g.L{sup -1}.d{sup -1}, with values of AV/AT above 0.5, but the system began to show signs of stability in the next load. The reactor showed biogas production up 1.57 L.L{sup -1}.d{sup -1}. (author)

  19. Cuckoo Search with flight of Levy applied to the problem of reload of fuels in nuclear reactors; Busca Cuco com voo de Levy aplicado ao problema de recarga de combustiveis em reatores nucleares

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Patrick V.; Nast, Fernando N.; Schirru, Roberto; Meneses, Anderson A.M., E-mail: patrickvs@hotmail.com, E-mail: fernandonnast@gmail.com, E-mail: anderson.meneses@pq.cnpq.br, E-mail: schirru@lmp.ufrj.br [Universidade Federal do Oeste do Para (UFOPA), Santarem, PA (Brazil). Instituto de Engenharia e Geociencias. Programa de Ciencia e Tecnologia; Coordenacao de Pos-Graduacao e Pesquisa de Engenharia (COPPE/UFRJ) RJ (Brazil). Programa de Engenharia Nuclear

    2017-11-01

    Intra-Nuclear Fuel Management Optimization is a complex combinatorial problem of the NP-difficult type, associated with the refueling process of a nuclear reactor, which aims to extend the cycle of operation by determining loading patterns, obeying safety margins. In addition to the combinatorial problem, we have the aspect of calculations of reactor physics, which increases the difficult of OGCIN. Methods that are proving effective when applied to OGCIN are the algorithms belonging to the swarm intelligence paradigm. A new member of this paradigm is Cuckoo Search (CS), which has shown results promising when applied to optimization issues. The CS is based on the litter parasitism of some cuckoo species combined with the Levy flight behavior of some birds. In the present work we present the results of the application of CS to OGCIN, and compare them to the results obtained by the application of ABC.

  20. A study of digital hardware architectures for nuclear reactors protection systems applications - reliability and safety analysis methods; Um estudo de arquiteturas de hardware para aplicacao em sistemas digitais de protecao de reatores nucleares - metodos de analise de confiabilidade e seguranca

    Energy Technology Data Exchange (ETDEWEB)

    Benko, Pedro Luiz

    1997-07-01

    A study of digital hardware architectures, including experience in many countries, topologies and solutions to interface circuits for protection systems of nuclear reactors is presented. Methods for developing digital systems architectures based on fault tolerant and safety requirements is proposed. Directives for assessing such conditions are suggested. Techniques and the most common tools employed in reliability, safety evaluation and modeling of hardware architectures is also presented. Markov chain modeling is used to evaluate the reliability of redundant architectures. In order to estimate software quality, several mechanisms to be used in design, specification, and validation and verification (V and V) procedures are suggested. A digital protection system architecture has been analyzed as a case study. (author)

  1. Neutron field characterization in the installation for BNCT study in the IEA-R1 reactor; Caracterizacao do campo de neutrons na instalacao para estudo em BNCT no reator IEA-R1

    Energy Technology Data Exchange (ETDEWEB)

    Carneiro Junior, Valdeci

    2008-07-01

    This work aims to characterize the mixed neutron and gamma field, in the sample irradiation position, in a research installation for Boron Neutron Capture Therapy (BNCT), in the IPEN IEA-R1 reactor. The BNCT technique has been studied as a safe and selective option in the treatment of resistant cancerigenous tumors or considered non-curable by the conventional techniques, for example, the Glioblastoma Multiform - a brain cancerigenous tumor. Neutron flux measurements were carried out: thermal, resonance and fast, as well as neutron and gamma rays doses, in the sample position, using activation foils detectors and thermoluminescent dosimeters. For the determination of the neutron spectrum and intensity, a set of different threshold activation foils and gold foils covered and uncovered with cadmium irradiated in the installation was used, analyzed by a high Pure Germanium semiconductor detector, coupled to an electronic system suitable for gamma spectrometry. The results were processed with the SAND-BP code. The doses due to gamma and neutron rays were determined using thermoluminescent dosimeters TLD 400 and TLD 700 sensitive to gamma and TLD 600, sensitive to neutrons. The TLDs were selected and used for obtaining the calibration curves - dosimeter answer versus dose - from each of the TLD three types, which were necessary to calculate the doses due to neutron and gamma, in the sample position. The radiation field, in the sample irradiation position, was characterized flux for thermal neutrons of 1.39.10{sup 8} {+-} 0,12.10{sup 8} n/cm{sup 2}s the doses due to thermal neutrons are three times higher than those due to gamma radiation and confirm the reproducibility and consistency of the experimental findings obtained. Considering these results, the neutron field and gamma radiation showed to be appropriated for research in BNCT. (author)

  2. Modelling and simulation the radioactive source-term of fission products in PWR type reactors; Modelagem e simulacao do termo-fonte radioativo de produtos de fissao em reatores nucleares do tipo PWR

    Energy Technology Data Exchange (ETDEWEB)

    Porfirio, Rogilson Nazare da Silva

    1996-07-01

    The source-term was defined with the purpose the quantify all radioactive nuclides released the nuclear reactor in the case of accidents. Nowadays the source-term is limited to the coolant of the primary circuit of reactors and may be measured or modelled with computer coders such as the TFP developed in this work. The calculational process is based on the linear chain techniques used in the CINDER-2 code. The TFP code considers forms of fission products release from the fuel pellet: Recoil, Knockout and Migration. The release from the gap to the coolant fluid is determined from the ratio between activity measured in the coolant and calculated activity in the gap. Considered the operational data of SURRY-1 reactor, the TFP code was run to obtain the source=term of this reactor. From the measured activities it was verified the reliability level of the model and the employed computational logic. The accuracy of the calculated quantities were compared to the measured data was considered satisfactory. (author)

  3. Transient cognitive dynamics, metastability, and decision making.

    Directory of Open Access Journals (Sweden)

    Mikhail I Rabinovich

    2008-05-01

    Full Text Available The idea that cognitive activity can be understood using nonlinear dynamics has been intensively discussed at length for the last 15 years. One of the popular points of view is that metastable states play a key role in the execution of cognitive functions. Experimental and modeling studies suggest that most of these functions are the result of transient activity of large-scale brain networks in the presence of noise. Such transients may consist of a sequential switching between different metastable cognitive states. The main problem faced when using dynamical theory to describe transient cognitive processes is the fundamental contradiction between reproducibility and flexibility of transient behavior. In this paper, we propose a theoretical description of transient cognitive dynamics based on the interaction of functionally dependent metastable cognitive states. The mathematical image of such transient activity is a stable heteroclinic channel, i.e., a set of trajectories in the vicinity of a heteroclinic skeleton that consists of saddles and unstable separatrices that connect their surroundings. We suggest a basic mathematical model, a strongly dissipative dynamical system, and formulate the conditions for the robustness and reproducibility of cognitive transients that satisfy the competing requirements for stability and flexibility. Based on this approach, we describe here an effective solution for the problem of sequential decision making, represented as a fixed time game: a player takes sequential actions in a changing noisy environment so as to maximize a cumulative reward. As we predict and verify in computer simulations, noise plays an important role in optimizing the gain.

  4. Advanced Instrumentation for Transient Reactor Testing

    Energy Technology Data Exchange (ETDEWEB)

    Corradini, Michael L.; Anderson, Mark; Imel, George; Blue, Tom; Roberts, Jeremy; Davis, Kurt

    2018-01-31

    Transient testing involves placing fuel or material into the core of specialized materials test reactors that are capable of simulating a range of design basis accidents, including reactivity insertion accidents, that require the reactor produce short bursts of intense highpower neutron flux and gamma radiation. Testing fuel behavior in a prototypic neutron environment under high-power, accident-simulation conditions is a key step in licensing nuclear fuels for use in existing and future nuclear power plants. Transient testing of nuclear fuels is needed to develop and prove the safety basis for advanced reactors and fuels. In addition, modern fuel development and design increasingly relies on modeling and simulation efforts that must be informed and validated using specially designed material performance separate effects studies. These studies will require experimental facilities that are able to support variable scale, highly instrumented tests providing data that have appropriate spatial and temporal resolution. Finally, there are efforts now underway to develop advanced light water reactor (LWR) fuels with enhanced performance and accident tolerance. These advanced reactor designs will also require new fuel types. These new fuels need to be tested in a controlled environment in order to learn how they respond to accident conditions. For these applications, transient reactor testing is needed to help design fuels with improved performance. In order to maximize the value of transient testing, there is a need for in-situ transient realtime imaging technology (e.g., the neutron detection and imaging system like the hodoscope) to see fuel motion during rapid transient excursions with a higher degree of spatial and temporal resolution and accuracy. There also exists a need for new small, compact local sensors and instrumentation that are capable of collecting data during transients (e.g., local displacements, temperatures, thermal conductivity, neutron flux, etc.).

  5. Synthesis, Crystal Structure and Luminescent Property of Cd (II Complex with <em>N-Benzenesulphonyl-L>-leucine

    Directory of Open Access Journals (Sweden)

    Xishi Tai

    2012-09-01

    Full Text Available A new trinuclear Cd (II complex [Cd3(L6(2,2-bipyridine3] [L =<em> Nem>-phenylsulfonyl-L>-leucinato] has been synthesized and characterized by elemental analysis, IR and X-ray single crystal diffraction analysis. The results show that the complex belongs to the orthorhombic, space group<em> Pem>212121 with<em> aem> = 16.877(3 Å, <em>b> em>= 22.875(5 Å, <em>c em>= 29.495(6 Å, <em>α> em>= <emem>= <emem>= 90°, <em>V> em>= 11387(4 Å3, <em>Z> em>= 4, <em>Dc>= 1.416 μg·m−3, <emem>= 0.737 mm−1, <em>F> em>(000 = 4992, and final <em>R>1 = 0.0390, <em>ωR>2 = 0.0989. The complex comprises two seven-coordinated Cd (II atoms, with a N2O5 distorted pengonal bipyramidal coordination environment and a six-coordinated Cd (II atom, with a N2O4 distorted octahedral coordination environment. The molecules form one dimensional chain structure by the interaction of bridged carboxylato groups, hydrogen bonds and p-p interaction of 2,2-bipyridine. The luminescent properties of the Cd (II complex and <em>N-Benzenesulphonyl-L>-leucine in solid and in CH3OH solution also have been investigated.

  6. Dual Interlocked Logic for Single-Event Transient Mitigation

    Science.gov (United States)

    2017-03-01

    Dual Interlocked Logic for Single -Event Transient Mitigation Jeffrey Maharrey, Jeffrey Kauppila, Dennis Ball, Timothy Holman, Lloyd Massengill...is shown to be robust to single event transients. Keywords: SET; CVSL; DIL; single event transient; hardened logic; cascode voltage switch; dual...interlocked Introduction Single event transients (SETs) generated in combinational logic are a major, often dominant, contributor to soft errors in

  7. SPIRITS: Uncovering Unusual Infrared Transients with Spitzer

    Energy Technology Data Exchange (ETDEWEB)

    Kasliwal, Mansi M.; Jencson, Jacob E.; Tinyanont, Samaporn; Cao, Yi; Cook, David [Division of Physics, Mathematics and Astronomy, California Institute of Technology, Pasadena, CA 91125 (United States); Bally, John [Center for Astrophysics and Space Astronomy, University of Colorado, 389 UCB, Boulder, CO 80309 (United States); Masci, Frank; Armus, Lee [Infrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125 (United States); Cody, Ann Marie [NASA Ames Research Center, Moffett Field, CA 94035 (United States); Bond, Howard E. [Dept. of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802 (United States); Contreras, Carlos [Las Campanas Observatory, Carnegie Observatories, Casilla 601, La Serena (Chile); Dykhoff, Devin A.; Amodeo, Samuel; Carlon, Robert L.; Cass, Alexander C.; Corgan, David T.; Faella, Joseph [Minnesota Institute for Astrophysics, School of Physics and Astronomy, 116 Church Street, S. E., University of Minnesota, Minneapolis, MN 55455 (United States); Boyer, Martha [NASA Goddard Space Flight Center, MC 665, 8800 Greenbelt Road, Greenbelt, MD 20771 (United States); Cantiello, Matteo [Center for Computational Astrophysics, Flatiron Institute, 162 Fifth Avenue, New York, NY 10010 (United States); Fox, Ori D. [Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States); and others

    2017-04-20

    We present an ongoing, five-year systematic search for extragalactic infrared transients, dubbed SPIRITS—SPitzer InfraRed Intensive Transients Survey. In the first year, using Spitzer /IRAC, we searched 190 nearby galaxies with cadence baselines of one month and six months. We discovered over 1958 variables and 43 transients. Here, we describe the survey design and highlight 14 unusual infrared transients with no optical counterparts to deep limits, which we refer to as SPRITEs (eSPecially Red Intermediate-luminosity Transient Events). SPRITEs are in the infrared luminosity gap between novae and supernovae, with [4.5] absolute magnitudes between −11 and −14 (Vega-mag) and [3.6]–[4.5] colors between 0.3 mag and 1.6 mag. The photometric evolution of SPRITEs is diverse, ranging from <0.1 mag yr{sup −1} to >7 mag yr{sup −1}. SPRITEs occur in star-forming galaxies. We present an in-depth study of one of them, SPIRITS 14ajc in Messier 83, which shows shock-excited molecular hydrogen emission. This shock may have been triggered by the dynamic decay of a non-hierarchical system of massive stars that led to either the formation of a binary or a protostellar merger.

  8. Transient T wave Changes Concerning Arrhythmia

    Directory of Open Access Journals (Sweden)

    Hirofumi Tasaki, MD PhD

    2007-01-01

    Full Text Available T-wave changes are thought to be associated with the repolarization phase of myocardial action potential. Although it has been known that persistent T-wave change is associated with the heart disease or the prognosis, the sensitivity and the specificity are not necessarily satisfactory for clinical therapeutic strategy. Recent basic studies have shown that, in some kinds of pathological states, transient repolarization changes of myocardial action potential were associated with life-threatening arrhythmia. Also clinical studies are being conducted to elucidate the clinical implication of transient T-wave changes on electrocardiography (ECG in such an arrhythmia. Transient repolarization or T-wave change is thought to occur because of environmental or neurohumoral factors, circadian variation, stretching of myocardium or other triggers in daily life, resulting in fatal arrhythmia. Such fatal arrhythmias are thought to occur under restricted conditions even in the patients with serious heart disease. It is important to clarify and utilize the transient T-wave change directly associated with the fatal arrhythmia on a clinical basis. In this article, we first assess the mechanisms of transient repolarization or T-wave changes on ECG concerning fatal arrhythmia, and afterwards refer to possible attempts at clinical evaluation and application.

  9. Transient simulation of molten salt central receiver

    Science.gov (United States)

    Doupis, Dimitri; Wang, Chuan; Carcorze-Soto, Jorge; Chen, Yen-Ming; Maggi, Andrea; Losito, Matteo; Clark, Michael

    2016-05-01

    Alstom is developing concentrated solar power (CSP) utilizing 60/40wt% NaNO3-KNO3 molten salt as the working fluid in a tower receiver for the global renewable energy market. In the CSP power generation cycle, receivers undergo a daily cyclic operation due to the transient nature of solar energy. Development of robust and efficient start-up and shut-down procedures is critical to avoiding component failures due to mechanical fatigue resulting from thermal transients, thus maintaining the performance and availability of the CSP plant. The Molten Salt Central Receiver (MSCR) is subject to thermal transients during normal daily operation, a cycle that includes warmup, filling, operation, draining, and shutdown. This paper describes a study to leverage dynamic simulation and finite element analysis (FEA) in development of start-up, shutdown, and transient operation concepts for the MSCR. The results of the FEA also verify the robustness of the MSCR design to the thermal transients anticipated during the operation of the plant.

  10. Molecular Cloning and Functional Analysis of Three <em>FLOWERING LOCUS T (FTem> Homologous Genes from Chinese <em>Cymbidium>

    Directory of Open Access Journals (Sweden)

    Jaime A. Teixeira da Silva

    2012-09-01

    Full Text Available The <em>FLOWERING LOCUS Tem> (<em>FT> gene plays crucial roles in regulating the transition from the vegetative to reproductive phase. To understand the molecular mechanism of reproduction, three homologous <em>FT> genes were isolated and characterized from <em>Cymbidium sinenseem> “Qi Jian Bai Mo”, <em>Cymbidium goeringiiem> and <em>Cymbidium ensifoliumem> “Jin Si Ma Wei”. The three genes<em> em>contained 618-bp nucleotides with a 531-bp open reading frame (ORF of encoding 176 amino acids (AAs. Alignment of the AA sequences revealed that CsFT, CgFT and CeFT contain a conserved domain, which is characteristic of the<em> em>PEBP-RKIP superfamily, and which share high identity with FT of other plants in GenBank: 94% with OnFT<em> em>from <em>Oncidium em>Gower Ramsey, 79% with Hd3a from <em>Oryza sativaem>, and 74% with FT from <em>Arabidopsis thalianaem>. qRT-PCR analysis showed a diurnal expression pattern of <em>CsFT>, <em>CgFT> and <em>CeFT> following both long day (LD, 16-h light/8-h dark and short day (SD, 8-h light/16-h dark treatment. While the transcripts of both <em>CsFT em>and <em>CeFT em>under LD were significantly higher than under SD, those of <em>CgFT em>were> em>higher under SD. Ectopic expression of <em>CgFT> in transgenic <em>Arabidopsis> plants resulted in early flowering compared to wild-type plants and significant up-regulation of <em>APETALA1em> (<em>AP1em> expression. Our data indicates that CgFT is a putative phosphatidylethanolamine-binding protein gene in <em>Cymbidium> that may regulate the vegetative to reproductive transition in flowers, similar to its <em>Arabidopsis> ortholog.

  11. Transient effects in friction fractal asperity creep

    CERN Document Server

    Goedecke, Andreas

    2013-01-01

    Transient friction effects determine the behavior of a wide class of mechatronic systems. Classic examples are squealing brakes, stiction in robotic arms, or stick-slip in linear drives. To properly design and understand mechatronic systems of this type, good quantitative models of transient friction effects are of primary interest. The theory developed in this book approaches this problem bottom-up, by deriving the behavior of macroscopic friction surfaces from the microscopic surface physics. The model is based on two assumptions: First, rough surfaces are inherently fractal, exhibiting roughness on a wide range of scales. Second, transient friction effects are caused by creep enlargement of the real area of contact between two bodies. This work demonstrates the results of extensive Finite Element analyses of the creep behavior of surface asperities, and proposes a generalized multi-scale area iteration for calculating the time-dependent real contact between two bodies. The toolset is then demonstrated both...

  12. Characterization of electrical appliances in transient state

    Science.gov (United States)

    Wójcik, Augustyn; Winiecki, Wiesław

    2017-08-01

    The article contains the study about electrical appliance characterization on the basis of power grid signals. To represent devices, parameters of current and voltage signals recorded during transient states are used. In this paper only transients occurring as a result of switching on devices are considered. The way of data acquisition performed in specialized measurement setup developed for electricity load monitoring is described. The paper presents the method of transients detection and the method of appliance parameters calculation. Using the set of acquired measurement data and appropriate software the set of parameters for several household appliances operating in different operating conditions was processed. Usefulness of appliances characterization in Non-Intrusive Appliance Load Monitoring System (NIALMS) with the use of proposed method is discussed focusing on obtained results.

  13. Transient response in granular bounded heap flows

    Science.gov (United States)

    Xiao, Hongyi; Ottino, Julio M.; Lueptow, Richard M.; Umbanhowar, Paul B.

    2017-11-01

    Heap formation, a canonical granular flow, is common in industry and is also found in nature. Here, we study the transition between steady flow states in quasi-2D bounded heaps by suddenly changing the feed rate from one fixed value to another. During the transition, in both experiments and discrete element method simulations, an additional wedge of flowing particles propagates over the rising free surface. The downstream edge of the wedge - the wedge front - moves downstream with velocity inversely proportional to the square root of time. An additional longer duration transient process continues after the wedge front reaches the downstream wall. The transient flux profile during the entire transition is well modeled by a diffusion-like equation derived from local mass balance and a local linear relation between the flux and the surface slope. Scalings for the transient kinematics during the flow transitions are developed based on the flux profiles. Funded by NSF Grant CBET-1511450.

  14. LOCALIZATION AND BROADBAND FOLLOW-UP OF THE GRAVITATIONAL-WAVE TRANSIENT GW150914

    Energy Technology Data Exchange (ETDEWEB)

    Abbott, B. P.; Abbott, R.; Abernathy, M. R.; Adhikari, R. X. [LIGO, California Institute of Technology, Pasadena, CA 91125 (United States); Abbott, T. D. [Louisiana State University, Baton Rouge, LA 70803 (United States); Acernese, F.; Addesso, P. [Università di Salerno, Fisciano, I-84084 Salerno (Italy); Ackley, K. [University of Florida, Gainesville, FL 32611 (United States); Adams, C. [LIGO Livingston Observatory, Livingston, LA 70754 (United States); Adams, T. [Laboratoire d’Annecy-le-Vieux de Physique des Particules (LAPP), Université Savoie Mont Blanc, CNRS/IN2P3, F-74941 Annecy-le-Vieux (France); Adya, V. B.; Affeldt, C.; Allen, B. [Albert-Einstein-Institut, Max-Planck-Institut für Gravitationsphysik, D-30167 Hannover (Germany); Agathos, M.; Agatsuma, K. [Nikhef, Science Park, 1098 XG Amsterdam (Netherlands); Aggarwal, N. [LIGO, Massachusetts Institute of Technology, Cambridge, MA 02139 (United States); Aguiar, O. D. [Instituto Nacional de Pesquisas Espaciais, 12227-010 São José dos Campos, SP (Brazil); Aiello, L. [INFN, Gran Sasso Science Institute, I-67100 L’Aquila (Italy); Ain, A. [Inter-University Centre for Astronomy and Astrophysics, Pune 411007 (India); Ajith, P., E-mail: lsc-spokesperson@ligo.org, E-mail: virgo-spokesperson@ego-gw.eu, E-mail: Julie.E.McEnery@nasa.gov [International Centre for Theoretical Sciences, Tata Institute of Fundamental Research, Bangalore 560012 (India); Collaboration: LIGO Scientific Collaboration and the Virgo Collaboration; Australian Square Kilometer Array Pathfinder (ASKAP) Collaboration; BOOTES Collaboration; Dark Energy Survey and the Dark Energy Camera GW-EM Collaborations; Fermi GBM Collaboration; Fermi LAT Collaboration; GRAvitational Wave Inaf TeAm (GRAWITA); INTEGRAL Collaboration; Intermediate Palomar Transient Factory (iPTF) Collaboration; InterPlanetary Network; J-GEM Collaboration; La Silla–QUEST Survey; Liverpool Telescope Collaboration; Low Frequency Array (LOFAR) Collaboration; MASTER Collaboration; MAXI Collaboration; Murchison Wide-field Array (MWA) Collaboration; Pan-STARRS Collaboration; PESSTO Collaboration; Pi of the Sky Collaboration; SkyMapper Collaboration; Swift Collaboration; TAROT, Zadko, Algerian National Observatory, and C2PU Collaboration; TOROS Collaboration; VISTA Collaboration; and others

    2016-07-20

    A gravitational-wave (GW) transient was identified in data recorded by the Advanced Laser Interferometer Gravitational-wave Observatory (LIGO) detectors on 2015 September 14. The event, initially designated G184098 and later given the name GW150914, is described in detail elsewhere. By prior arrangement, preliminary estimates of the time, significance, and sky location of the event were shared with 63 teams of observers covering radio, optical, near-infrared, X-ray, and gamma-ray wavelengths with ground- and space-based facilities. In this Letter we describe the low-latency analysis of the GW data and present the sky localization of the first observed compact binary merger. We summarize the follow-up observations reported by 25 teams via private Gamma-ray Coordinates Network circulars, giving an overview of the participating facilities, the GW sky localization coverage, the timeline, and depth of the observations. As this event turned out to be a binary black hole merger, there is little expectation of a detectable electromagnetic (EM) signature. Nevertheless, this first broadband campaign to search for a counterpart of an Advanced LIGO source represents a milestone and highlights the broad capabilities of the transient astronomy community and the observing strategies that have been developed to pursue neutron star binary merger events. Detailed investigations of the EM data and results of the EM follow-up campaign are being disseminated in papers by the individual teams.

  15. <em>α>-Glucosidase Inhibitory Constituents from <em>Acanthopanax senticosusem> Harm Leaves

    Directory of Open Access Journals (Sweden)

    Hai-Xue Kuang

    2012-05-01

    Full Text Available A new triterpene glycoside, 3-<em>O-[(α>-L-rhamnopyranosyl(1→2]-[<em>β>-D-glucuronopyranosyl-6-<em>O>-methyl ester]-olean-12-ene-28-olic acid (1 and a new indole alkaloid, 5-methoxy-2-oxoindolin-3-acetic acid methyl ester (5 were isolated from the leaves of <em>Acanthopanax senticosusem> Harms along with six known compounds. The structures of the new compounds were determined by means of 2D-NMR experiments and chemical methods. All the isolated compounds were evaluated for their glycosidase inhibition activities and compound 6 showed significant <em>α>-glucosidase inhibition activity.

  16. Transient behaviour of small HTR for cogeneration

    International Nuclear Information System (INIS)

    Verkerk, E.C.; Van Heek, A.I.

    2000-01-01

    The Dutch market for combined generation of heat and power identifies a unit size of 40 MW thermal for the conceptual design of a nuclear cogeneration plant. The ACACIA system provides 14 MWe electricity combined with 17 t/h of high temperature steam (220 deg C, 10 bar) with a pebble-bed high temperature reactor directly coupled with a helium compressor and a helium turbine. The design of this small CHP unit that is used for industrial applications is mainly based on a pre-feasibility study in 1996, performed by a joint working group of five Dutch organisations, in which technical feasibility was shown. Thermal hydraulic and reactor physics analyses show favourable control characteristics during normal operation and a benign response to loss of helium coolant and loss of flow conditions. Throughout the response on these highly infrequent conditions, ample margin exists between the highest fuel temperatures and the temperature above which fuel degradation will occur. To come to quantitative statements about the ACACIA transient behaviour, a calculational coupling between the high temperature reactor core analysis code package PANTHER/DIREKT and the thermal hydraulic code RELAP5 for the energy conversion system has been made. This coupling offers a more realistic simulation of the entire system, since it removes the necessity of forcing boundary conditions on the simulation models at the data transfer points. In this paper, the models used for the dynamic components of the energy conversion system are described, and the results of the calculation for two operational transients in order to demonstrate the effects of the interaction between reactor core and its energy conversion system are shown. Several transient cases that are representative as operational transients for an HTR will be discussed, including one representing a load rejection case that shows the functioning of the control system, in particular the bypass valve. Another transient is a load following

  17. Transient Seepage for Levee Engineering Analyses

    Science.gov (United States)

    Tracy, F. T.

    2017-12-01

    Historically, steady-state seepage analyses have been a key tool for designing levees by practicing engineers. However, with the advances in computer modeling, transient seepage analysis has become a potentially viable tool. A complication is that the levees usually have partially saturated flow, and this is significantly more complicated in transient flow. This poster illustrates four elements of our research in partially saturated flow relating to the use of transient seepage for levee design: (1) a comparison of results from SEEP2D, SEEP/W, and SLIDE for a generic levee cross section common to the southeastern United States; (2) the results of a sensitivity study of varying saturated hydraulic conductivity, the volumetric water content function (as represented by van Genuchten), and volumetric compressibility; (3) a comparison of when soils do and do not exhibit hysteresis, and (4) a description of proper and improper use of transient seepage in levee design. The variables considered for the sensitivity and hysteresis studies are pore pressure beneath the confining layer at the toe, the flow rate through the levee system, and a levee saturation coefficient varying between 0 and 1. Getting results for SEEP2D, SEEP/W, and SLIDE to match proved more difficult than expected. After some effort, the results matched reasonably well. Differences in results were caused by various factors, including bugs, different finite element meshes, different numerical formulations of the system of nonlinear equations to be solved, and differences in convergence criteria. Varying volumetric compressibility affected the above test variables the most. The levee saturation coefficient was most affected by the use of hysteresis. The improper use of pore pressures from a transient finite element seepage solution imported into a slope stability computation was found to be the most grievous mistake in using transient seepage in the design of levees.

  18. Transient astronomy with the Gaia satellite.

    Science.gov (United States)

    Hodgkin, Simon T; Wyrzykowski, Łukasz; Blagorodnova, Nadejda; Koposov, Sergey

    2013-06-13

    Gaia is a cornerstone European Space Agency astrometry space mission and a successor to the Hipparcos mission. Gaia will observe the whole sky for 5 years, providing a serendipitous opportunity for the discovery of large numbers of transient and anomalous events, e.g. supernovae, novae and microlensing events, gamma-ray burst afterglows, fallback supernovae, as well as theoretical or unexpected phenomena. In this paper, we discuss our preparations to use Gaia to search for transients at optical wavelengths, and briefly describe the early detection, classification and prompt publication of anomalous sources.

  19. Pressure Transient Analysis of Dual Fractal Reservoir

    Directory of Open Access Journals (Sweden)

    Xiao-Hua Tan

    2013-01-01

    Full Text Available A dual fractal reservoir transient flow model was created by embedding a fracture system simulated by a tree-shaped fractal network into a matrix system simulated by fractal porous media. The dimensionless bottom hole pressure model was created using the Laplace transform and Stehfest numerical inversion methods. According to the model's solution, the bilogarithmic type curves of the dual fractal reservoirs are illustrated, and the influence of different fractal factors on pressure transient responses is discussed. This semianalytical model provides a practical and reliable method for empirical applications.

  20. Transient elastography for liver fibrosis diagnosis

    DEFF Research Database (Denmark)

    Andersen, Ellen Sloth; Christensen, Peer Brehm; Weis, Nina

    2009-01-01

    Liver biopsy is considered the "golden standard" for assessment of hepatic fibrosis. However, the procedure has limitations because of inconvenience and rare but serious complications as bleeding. Furthermore, sampling errors are frequent, and interobserver variability often poses problems....... Recently, a modified ultrasound scanner (transient elastography) has been developed to assess fibrosis. The device measures liver elasticity, which correlates well with the degree of fibrosis. Studies have shown that transient elastography is more accurate in diagnosing cirrhosis than minor to moderate...... to be a valuable diagnostic procedure and follow-up of patients with chronic liver diseases....

  1. Transient waves in visco-elastic media

    CERN Document Server

    Ricker, Norman

    1977-01-01

    Developments in Solid Earth Geophysics 10: Transient Waves in Visco-Elastic Media deals with the propagation of transient elastic disturbances in visco-elastic media. More specifically, it explores the visco-elastic behavior of a medium, whether gaseous, liquid, or solid, for very-small-amplitude disturbances. This volume provides a historical overview of the theory of the propagation of elastic waves in solid bodies, along with seismic prospecting and the nature of seismograms. It also discusses the seismic experiments, the behavior of waves propagated in accordance with the Stokes wave

  2. Switching transients in large offshore wind farms

    Energy Technology Data Exchange (ETDEWEB)

    King, Rose; Jenkins, Nick [Cardiff Univ., Wales (United Kingdom). Centre for Integrated Renewable Energy, Generation and Supply

    2008-07-01

    The energisation of a wind farm is studied in EMTP-RV. Two different types of array collection networks are studied, one with redundancy and the other with tapered cabling. A wideband frequency-dependent model is used to represent the cables and a circuit breaker model which includes pre-strike and re-strike characteristics is used. The response of the circuit to switching at the offshore substation is shown. The cable lengths between the turbines are varied to show the impact this has on the wave propagation of the transient over-voltage. The difficulties associated with modelling the offshore wind farm for high frequency transient studies are highlighted. (orig.)

  3. Transient Rayleigh scattering from single semiconductor nanowires

    Energy Technology Data Exchange (ETDEWEB)

    Montazeri, Mohammad; Jackson, Howard E.; Smith, Leigh M. [Department of Physics, University of Cincinnati, Cincinnati, OH 45221-0011 (United States); Yarrison-Rice, Jan M. [Department of Physics, Miami University, Oxford, OH 45056 (United States); Kang, Jung-Hyun; Gao, Qiang; Tan, Hark Hoe; Jagadish, Chennupati [Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National University, Canberra, ACT 0200 (Australia)

    2013-12-04

    Transient Rayleigh scattering spectroscopy is a new pump-probe technique to study the dynamics and cooling of photo-excited carriers in single semiconductor nanowires. By studying the evolution of the transient Rayleigh spectrum in time after excitation, one can measure the time evolution of the density and temperature of photo-excited electron-hole plasma (EHP) as they equilibrate with lattice. This provides detailed information of dynamics and cooling of carriers including linear and bimolecular recombination properties, carrier transport characteristics, and the energy-loss rate of hot electron-hole plasma through the emission of LO and acoustic phonons.

  4. Experimental verification of transient nonlinear acoustical holography.

    Science.gov (United States)

    Jing, Yun; Cannata, Jonathan; Wang, Tianren

    2013-05-01

    This paper presents an experimental study on nonlinear transient acoustical holography. The validity and effectiveness of a recently proposed nonlinear transient acoustical holography algorithm is evaluated in the presence of noise. The acoustic field measured on a post-focal plane of a high-intensity focused transducer is backward projected to reconstruct the pressure distributions on the focal and a pre-focal plane, which are shown to be in good agreement with the measurement. In contrast, the conventional linear holography produces erroneous results in this case where the nonlinearity involved is strong. Forward acoustic field projection was also carried out to further verify the algorithm.

  5. Analysis of single particle diffusion with transient binding using particle filtering.

    Science.gov (United States)

    Bernstein, Jason; Fricks, John

    2016-07-21

    Diffusion with transient binding occurs in a variety of biophysical processes, including movement of transmembrane proteins, T cell adhesion, and caging in colloidal fluids. We model diffusion with transient binding as a Brownian particle undergoing Markovian switching between free diffusion when unbound and diffusion in a quadratic potential centered around a binding site when bound. Assuming the binding site is the last position of the particle in the unbound state and Gaussian observational error obscures the true position of the particle, we use particle filtering to predict when the particle is bound and to locate the binding sites. Maximum likelihood estimators of diffusion coefficients, state transition probabilities, and the spring constant in the bound state are computed with a stochastic Expectation-Maximization (EM) algorithm. Copyright © 2016 Elsevier Ltd. All rights reserved.

  6. Transient coupled calculations of the Molten Salt Fast Reactor using the Transient Fission Matrix approach

    Energy Technology Data Exchange (ETDEWEB)

    Laureau, A., E-mail: laureau.axel@gmail.com; Heuer, D.; Merle-Lucotte, E.; Rubiolo, P.R.; Allibert, M.; Aufiero, M.

    2017-05-15

    Highlights: • Neutronic ‘Transient Fission Matrix’ approach coupled to the CFD OpenFOAM code. • Fission Matrix interpolation model for fast spectrum homogeneous reactors. • Application for coupled calculations of the Molten Salt Fast Reactor. • Load following, over-cooling and reactivity insertion transient studies. • Validation of the reactor intrinsic stability for normal and accidental transients. - Abstract: In this paper we present transient studies of the Molten Salt Fast Reactor (MSFR). This generation IV reactor is characterized by a liquid fuel circulating in the core cavity, requiring specific simulation tools. An innovative neutronic approach called “Transient Fission Matrix” is used to perform spatial kinetic calculations with a reduced computational cost through a pre-calculation of the Monte Carlo spatial and temporal response of the system. Coupled to this neutronic approach, the Computational Fluid Dynamics code OpenFOAM is used to model the complex flow pattern in the core. An accurate interpolation model developed to take into account the thermal hydraulics feedback on the neutronics including reactivity and neutron flux variation is presented. Finally different transient studies of the reactor in normal and accidental operating conditions are detailed such as reactivity insertion and load following capacities. The results of these studies illustrate the excellent behavior of the MSFR during such transients.

  7. Searching for MHz Transients with the VLA Low-band Ionosphere and Transient Experiment (VLITE)

    Science.gov (United States)

    Polisensky, Emil; Peters, Wendy; Giacintucci, Simona; Clarke, Tracy; Kassim, Namir E.; hyman, Scott D.; van der Horst, Alexander; Linford, Justin; Waldron, Zach; Frail, Dale

    2018-01-01

    NRL and NRAO have expanded the low frequency capabilities of the VLA through the VLA Low-band Ionosphere and Transient Experiment (VLITE, http://vlite.nrao.edu/ ), effectively making the instrument two telescopes in one. VLITE is a commensal observing system that harvests data from the prime focus in parallel with normal Cassegrain focus observing on a subset of VLA antennas. VLITE provides over 6000 observing hours per year in a > 5 square degree field-of-view using 64 MHz bandwidth centered on 352 MHz. By operating in parallel, VLITE offers invaluable low frequency data to targeted observations of transient sources detected at higher frequencies. With arcsec resolution and mJy sensitivity, VLITE additionally offers great potential for blind searches of rarer radio-selected transients. We use catalog matching software on the imaging products from the daily astrophysics pipeline and the LOFAR Transients Pipeline (TraP) on repeated observations of the same fields to search for coherent and incoherent astronomical transients on timescales of a few seconds to years. We present the current status of the VLITE transient science program from its initial deployment on 10 antennas in November 2014 through its expansion to 16 antennas in the summer of 2017. Transient limits from VLITE’s first year of operation (Polisensky et al. 2016) are updated per the most recent analysis.

  8. Test of the Weak Equivalence Principle using LIGO observations of GW150914 and Fermi observations of GBM transient 150914

    Science.gov (United States)

    Liu, Molin; Zhao, Zonghua; You, Xiaohe; Lu, Jianbo; Xu, Lixin

    2017-07-01

    About 0.4 s after the Laser Interferometer Gravitational-Wave Observatory (LIGO) detected a transient gravitational-wave (GW) signal GW150914, the Fermi Gamma-ray Burst Monitor (GBM) also found a weak electromagnetic transient (GBM transient 150914). Time and location coincidences favor a possible association between GW150904 and GBM transient 150914. Under this possible association, we adopt Fermi's electromagnetic (EM) localization and derive constraints on possible violations of the Weak Equivalence Principle (WEP) from the observations of two events. Our calculations are based on four comparisons: (1) The first is the comparison of the initial GWs detected at the two LIGO sites. From the different polarizations of these initial GWs, we obtain a limit on any difference in the parametrized post-Newtonian (PPN) parameter Δγ ≲10-10. (2) The second is a comparison of GWs and possible EM waves. Using a traditional super-Eddington accretion model for GBM transient 150914, we again obtain an upper limit Δγ ≲10-10. Compared with previous results for photons and neutrinos, our limits are five orders of magnitude stronger than those from PeV neutrinos in blazar flares, and seven orders stronger than those from MeV neutrinos in SN1987A. (3) The third is a comparison of GWs with different frequencies in the range [35 Hz, 250 Hz]. (4) The fourth is a comparison of EM waves with different energies in the range [1 keV, 10 MeV]. These last two comparisons lead to an even stronger limit, Δγ ≲10-8. Our results highlight the potential of multi-messenger signals exploiting different emission channels to strengthen existing tests of the WEP.

  9. Test of the Weak Equivalence Principle using LIGO observations of GW150914 and Fermi observations of GBM transient 150914

    Directory of Open Access Journals (Sweden)

    Molin Liu

    2017-07-01

    Full Text Available About 0.4 s after the Laser Interferometer Gravitational-Wave Observatory (LIGO detected a transient gravitational-wave (GW signal GW150914, the Fermi Gamma-ray Burst Monitor (GBM also found a weak electromagnetic transient (GBM transient 150914. Time and location coincidences favor a possible association between GW150904 and GBM transient 150914. Under this possible association, we adopt Fermi's electromagnetic (EM localization and derive constraints on possible violations of the Weak Equivalence Principle (WEP from the observations of two events. Our calculations are based on four comparisons: (1 The first is the comparison of the initial GWs detected at the two LIGO sites. From the different polarizations of these initial GWs, we obtain a limit on any difference in the parametrized post-Newtonian (PPN parameter Δγ≲10−10. (2 The second is a comparison of GWs and possible EM waves. Using a traditional super-Eddington accretion model for GBM transient 150914, we again obtain an upper limit Δγ≲10−10. Compared with previous results for photons and neutrinos, our limits are five orders of magnitude stronger than those from PeV neutrinos in blazar flares, and seven orders stronger than those from MeV neutrinos in SN1987A. (3 The third is a comparison of GWs with different frequencies in the range [35 Hz, 250 Hz]. (4 The fourth is a comparison of EM waves with different energies in the range [1 keV, 10 MeV]. These last two comparisons lead to an even stronger limit, Δγ≲10−8. Our results highlight the potential of multi-messenger signals exploiting different emission channels to strengthen existing tests of the WEP.

  10. Reactivity transient calculatios in research reactor

    International Nuclear Information System (INIS)

    Santos, R.S. dos

    1986-01-01

    A digital program for reactivity transient analysis in research reactor and cylindrical geometry was showed quite efficient when compared with methods and programs of the literature, as much in the solution of the neutron kinetics equation as in the thermohydraulic. An improvement in the representation of the feedback reactivity adopted on the program reduced markedly the computation time, with some accuracy. (Author) [pt

  11. Brittle fracture of polymer transient networks

    DEFF Research Database (Denmark)

    Arora, S.; Shabbir, A.; Hassager, O.

    2017-01-01

    We study the fracture of reversible double transient networks, constituted of water suspensions of entangled surfactant wormlike micelles reversibly linked by various amounts of telechelic polymers. We provide a state diagram that delineates the regime of fracture without necking of the filament...

  12. Brittle fracture of polymer transient networks

    DEFF Research Database (Denmark)

    Arora, Srishti; Shabbir, Aamir; Hassager, Ole

    We study the fracture of reversible double transient networks, constituted of a water suspension of entangled surfactant wormlike micelles reversibly linked by various amounts of telechelic polymers. We provide a state diagram that delineates the regime of fracture without necking of the filament...

  13. Tackling complex turbulent flows with transient RANS

    NARCIS (Netherlands)

    Kenjeres, S.; Hanjalic, K.

    2009-01-01

    This article reviews some recent applications of the transient-Reynoldsaveraged Navier–Stokes (T-RANS) approach in simulating complex turbulent flows dominated by externally imposed body forces, primarily by thermal buoyancy and the Lorentz force. The T-RANS aims at numerical resolving unsteady

  14. Long-transient conoscopic pattern technique

    Science.gov (United States)

    Chen, X.; Calemczuk, R.; Salce, B.; Lavorel, B.; Akir, C.; Rajaonah, L.

    1999-04-01

    Recent results on laser induced anisotropy in terbium gallium garnet are extended to the dynamic regime. We observed that the characteristic conoscopic pattern formation time presents a quadratic dependence on the beam size. The observed pattern intensity is accounted for by a simple analytical formula. The transient refractive index change due to thermal stress in the terbium gallium garnet is determined.

  15. Transient Evoked aotacoustic emissions otologically normal adults

    African Journals Online (AJOL)

    ABUTH

    between 1999-2000 using a manually Operated Madson Audiometer ,and the IL 088 otodynamic. Analyser was used to record transient otoacoustic emission. Results The age groups were 20-30,31-40, 41-50, 51-60 years .There was no significant difference in threshold as a function of age at p<0.05 .The TEOAE amplitude ...

  16. Plasma response to transient high voltage pulses

    Indian Academy of Sciences (India)

    journal of. July 2013 physics pp. 35–66. Plasma response to transient high voltage pulses. S KAR. ∗ and S MUKHERJEE. Institute for Plasma Research, Bhat, Gandhinagar ... Child law current (implantation current) density across the sheath is ... Let ni = ns = constant within the sheath of thickness s0 and choose x = 0 at the.

  17. Laser spectroscopy and dynamics of transient species

    Energy Technology Data Exchange (ETDEWEB)

    Clouthier, D.J. [Univ. of Kentucky, Lexington (United States)

    1993-12-01

    The goal of this program is to study the vibrational and electronic spectra and excited state dynamics of a number of transient sulfur and oxygen species. A variety of supersonic jet techniques, as well as high resolution FT-IR and intracavity dye laser spectroscopy, have been applied to these studies.

  18. Mechanisms of transient radiation-induced creep

    International Nuclear Information System (INIS)

    Pyatiletov, Yu.S.

    1981-01-01

    Radiation-induced creep at the transient stage is investigated for metals. The situation, when several possible creep mechanisms operate simultaneously is studied. Among them revealed are those which give the main contribution and determine thereby the creep behaviour. The time dependence of creep rate and its relation to the smelling rate is obtained. The results satisfactorily agree with the available experimental data [ru

  19. A transient absorption study of allophycocyanin

    Indian Academy of Sciences (India)

    Unknown

    Experimental setup. The transient absorption (TA) experimental arrangement is shown in figure 1, and the ultrashort laser system is the same as used in our previous work.5 The pump energy is provided by the output of an OPA laser and attenuated to 30 nJ per pulse with a pulse duration time of 100 femtoseconds (fs) with ...

  20. A review on transient monitoring systems

    International Nuclear Information System (INIS)

    Baylac, G.

    1986-01-01

    A good design must be followed by the continuous verification during service of design basis hypotheses. Transient monitoring techniques described hereafter were developed to fulfill this very logical requirement. They are shown to be useful to improve the reliability, operability, inspection and lifetime of components of the Reactor Coolant Pressure Boundary. 16 refs.

  1. Transient Evoked aotacoustic emissions otologically normal adults

    African Journals Online (AJOL)

    ABUTH

    Objective: To examine the effects of aging on the existence of transient evoked otoacoustic emissions in normal adult. Material and methods 40 subjects ( 30 males, 10 females) aged between 20-60 years were divided into 4 groups by representing. All patients were screened to insure otologically normal subjects based on ...

  2. Transient Stuttering in Catatonic Bipolar Patients

    Directory of Open Access Journals (Sweden)

    Anthony B. Joseph

    1991-01-01

    Full Text Available Two cases of transient stuttering occurring in association with catatonia and bipolar disorder are described. Affective decompensation has been associated with lateralized cerebral dysfunction, and it is hypothesized that in some bipolar catatonic patients a concomitant disorder of the lateralization of language function may lead to a variety of clinical presentations including aphasia, mutism, and stuttering.

  3. Calculation of transients in WWER power plant

    International Nuclear Information System (INIS)

    Macek, J.; Kyncl, M.

    1981-01-01

    A mathematical model is described for the computation of transient processes in a nuclear power plant as is the DYNAMIKA computer program. The program is used for computing two accident variants: rupture of the main steam collector and a failure of the main circulating pump. (H.S.)

  4. Transiently expressed pattern during myogenesis and candidate ...

    Indian Academy of Sciences (India)

    phylogenetic trees), some conservative characteristics (e.g., six transmembrane domains and two E-boxes in the 5 UTR might be the potential ... highest expression levels in stage E15 in LM and E19 in BM, and then dropping transiently in E23 (P < 0.05). ..... maximum likelihood, evolutionary distance, and maximum par-.

  5. simulation of electromagnetic transients in power systems

    African Journals Online (AJOL)

    Dr Obe

    1996-09-01

    Sep 1, 1996 ... ABSTRACT. Transients in power systems are initiated by abrupt changes to otherwise steady operating conditions. These changes would be as a result of any of the following: opening or closing of circuit breakers, switching conditions, lightning or any other fault condition. For purposes of power system.

  6. Electric fields associated with transient surface currents

    DEFF Research Database (Denmark)

    McAllister, Iain Wilson

    1992-01-01

    The boundary condition to be fulfilled by the potential functions associated with a transient surface current is derived and expressed in terms of generalized orthogonal coordinates. From the analysis, it can be deduced that the use of the method of separation of variables is restricted to three ...

  7. Polynomial approximation approach to transient heat conduction ...

    African Journals Online (AJOL)

    This work reports polynomial approximation approach to transient heat conduction in a long slab, long cylinder and sphere with linear internal heat generation. It has been shown that the polynomial approximation method is able to calculate average temperature as a function of time for higher value of Biot numbers.

  8. [Chronic subdural hematoma and transient neurologic deficits].

    Science.gov (United States)

    Nicoli, F; Milandre, L; Lemarquis, P; Bazan, M; Jau, P

    1990-01-01

    Three cases of chronic subdural hematoma (CSDH) revealed by transient neurological accidents are reported. Although well-known this condition is rare: 1 to 9 p. 100 of CSDHs. Questioning may bring out a history of cranial injury and headache, even minor ones, which are unusual in transient ischemic accidents (TIA). Transient phenomena, such as motor aphasia or speech interruption, point to the diagnosis, especially in male patients over 60 years of age. The finding at electroencephalography of a delta activity more than 48 hours after a TND should exclude the diagnosis of TIA until a CT scan is performed. Since the causes of neurological deficits regressing within less than 24 hours may be ischemia as well a hemorrhage or tumour, the term of transient neurological accident (TNA) should preferably be used, and an emergency CT scan should be performed for diagnostic and therapeutic purposes. Owing to the possibility of another concomitant cause of TNA, the finding of a subdural haematoma should not deter from pursuing cardiovascular examinations. The mechanism of TNA probably involves a vascular factor, as suggested by I-123 IMP cerebral SPECT which shows an intercritical decrease in cerebral blood flow and/or an epileptic factor.

  9. Characterizing transient radio-frequency interference

    Science.gov (United States)

    Czech, Daniel; Mishra, Amit; Inggs, Michael

    2017-07-01

    Transient radio-frequency interference (RFI) events can be generated as unintended by-products of the normal operation of devices such as mechanical relays or electric motors. In the radio astronomy reserve in South Africa, several new radio telescopes such as MeerKAT, the Square Kilometre Array, and the Hydrogen Epoch of Reionization Array are planned or under construction. Some will begin observations before others are complete. The associated construction equipment and infrastructure could include transient RFI sources with the potential to degrade astronomical observations. In this paper we present an analysis of RFI events in the time domain, for which we have recorded a data set of nine common sources of transient RFI. We statistically characterize these RFI signals and investigate the effectiveness of analyzing them using components analysis methods such as principal components analysis (PCA) and kernel PCA. Several interesting insights are presented on the statistical properties of this type of RFI in the time domain. The procedure we propose for analyzing transient RFI is expected to be useful for real-time analysis and identification of RFI events.

  10. Diuretics for transient tachypnoea of the newborn.

    Science.gov (United States)

    Kassab, Manal; Khriesat, Wadah M; Anabrees, Jasim

    2015-11-21

    Transient tachypnoea of the newborn (TTN) results from delayed clearance of lung liquid and is a common cause of admission of full-term infants to neonatal intensive care units. The condition is particularly common after elective caesarean section. Conventional treatment involves appropriate oxygen administration and continuous positive airway pressure in some cases. Most infants receive antibiotic therapy. Hastening the clearance of lung liquid may shorten the duration of the symptoms and reduce complications. To determine whether diuretic administration reduces the duration of oxygen therapy and respiratory symptoms and shortens hospital stay in term infants presenting with transient tachypnoea of the newborn. An updated search was carried out in September 2015 of the following databases: the Cochrane Central Register of Controlled Trials (CENTRAL) (The Cochrane Library issue 9, 2015), MEDLINE via Ovid, EMBASE, PubMed, and CINAHL via OVID. We included randomised and quasi-randomised controlled trials that compared the effect of diuretics administration versus placebo or no treatment in infants of less than seven days of age, born at 37 or more weeks of gestation with the clinical picture of transient tachypnoea of the newborn. We extracted and analysed data according to the methods outlined in the latest Cochrane Handbook for Systematic Reviews of Interventions. Two review authors assessed trial quality in each potentially eligible manuscript and two review authors extracted data. Our previous systematic review included two trials enrolling a total of 100 infants with transient tachypnoea of the newborn (Wiswell 1985; Karabayir 2006). The updated search revealed no new trials. Wiswell 1985 randomised 50 infants to receive either oral furosemide (2 mg/kg body weight at time of diagnosis followed by a 1 mg/kg dose 12 hours later if the tachypnoea persisted) or placebo. Karabayir 2006 randomised 50 infants to receive either intravenous furosemide (2 mg/kg body

  11. The fast transient sky with Gaia

    Science.gov (United States)

    Wevers, Thomas; Jonker, Peter G.; Hodgkin, Simon T.; Kostrzewa-Rutkowska, Zuzanna; Harrison, Diana L.; Rixon, Guy; Nelemans, Gijs; Roelens, Maroussia; Eyer, Laurent; van Leeuwen, Floor; Yoldas, Abdullah

    2018-01-01

    The ESA Gaia satellite scans the whole sky with a temporal sampling ranging from seconds and hours to months. Each time a source passes within the Gaia field of view, it moves over 10 charge coupled devices (CCDs) in 45 s and a light curve with 4.5 s sampling (the crossing time per CCD) is registered. Given that the 4.5 s sampling represents a virtually unexplored parameter space in optical time domain astronomy, this data set potentially provides a unique opportunity to open up the fast transient sky. We present a method to start mining the wealth of information in the per CCD Gaia data. We perform extensive data filtering to eliminate known onboard and data processing artefacts, and present a statistical method to identify sources that show transient brightness variations on ≲2 h time-scales. We illustrate that by using the Gaia photometric CCD measurements, we can detect transient brightness variations down to an amplitude of 0.3 mag on time-scales ranging from 15 s to several hours. We search an area of ∼23.5 deg2 on the sky and find four strong candidate fast transients. Two candidates are tentatively classified as flares on M-dwarf stars, while one is probably a flare on a giant star and one potentially a flare on a solar-type star. These classifications are based on archival data and the time-scales involved. We argue that the method presented here can be added to the existing Gaia Science Alerts infrastructure for the near real-time public dissemination of fast transient events.

  12. Localization and Broadband Follow-Up of the Gravitational-Wave Transient GW150914

    DEFF Research Database (Denmark)

    P. Abbott, B.; Abbott, R.; Abbott, T. D.

    2016-01-01

    A gravitational-wave (GW) transient was identified in data recorded by the Advanced Laser InterferometerGravitational-wave Observatory (LIGO) detectors on 2015 September 14. The event, initially designated G184098and later given the name GW150914, is described in detail elsewhere. By prior...... of the observations. As this event turned out to be a binary black hole merger,there is little expectation of a detectable electromagnetic (EM) signature. Nevertheless, this first broadbandcampaign to search for a counterpart of an Advanced LIGO source represents a milestone and highlights the broadcapabilities...

  13. Single and sequential inversions of radiomagnetotelluric and transient electromagnetic data

    Science.gov (United States)

    Pratama, Ridho Nanda; Widodo

    2017-07-01

    The Volvi basin is an alluvial valley located 45 km northeast of the city of Thessaloniki in Northern Greece. It is a neotectonic graben (6 km wide) structure with increasing seismic activity where the large 1978 Thessaloniki earthquake occurred. Hence, near surface Electromagnetic (EM) which are Radiomagnetotelluric (RMT) and Transient Electromagnetic (TEM) measurements are carried out to understand the location of the local active fault and the top of the basement structure of the research area. The sequential Inversion of both data was performed to get detailed information of subsurface structure. Whereas RMT data is sensitive to describe in shallow structure, while the deeper structure is related to TEM data. We derived the sequential inversion scheme from the second order of Marquardt algorithm using singular value decomposition (SVD). The sequential model has been improved the resolution of the single model which has more than 0.9 on the importance value. Single and sequential inversions of RMT and TEM give a consistent result in which both identify the fault structure indication.

  14. Neonatal Phosphate Nutrition Alters <em>in em>Vivo> and <em>in em>Vitro> Satellite Cell Activity in Pigs

    Directory of Open Access Journals (Sweden)

    Chad H. Stahl

    2012-05-01

    Full Text Available Satellite cell activity is necessary for postnatal skeletal muscle growth. Severe phosphate (PO4 deficiency can alter satellite cell activity, however the role of neonatal PO4 nutrition on satellite cell biology remains obscure. Twenty-one piglets (1 day of age, 1.8 ± 0.2 kg BW were pair-fed liquid diets that were either PO4 adequate (0.9% total P, supra-adequate (1.2% total P in PO4 requirement or deficient (0.7% total P in PO4 content for 12 days. Body weight was recorded daily and blood samples collected every 6 days. At day 12, pigs were orally dosed with BrdU and 12 h later, satellite cells were isolated. Satellite cells were also cultured <em>in vitroem> for 7 days to determine if PO4 nutrition alters their ability to proceed through their myogenic lineage. Dietary PO4 deficiency resulted in reduced (<em>P> < 0.05 sera PO4 and parathyroid hormone (PTH concentrations, while supra-adequate dietary PO4 improved (<em>P> < 0.05 feed conversion efficiency as compared to the PO4 adequate group. <em>In vivoem> satellite cell proliferation was reduced (<em>P> < 0.05 among the PO4 deficient pigs, and these cells had altered <em>in vitroem> expression of markers of myogenic progression. Further work to better understand early nutritional programming of satellite cells and the potential benefits of emphasizing early PO4 nutrition for future lean growth potential is warranted.

  15. Steady and transient regimes in hydropower plants

    Science.gov (United States)

    Gajic, A.

    2013-12-01

    Hydropower plant that has been in operation for about 30 years has to be reconstructed. They have already installed 12 Kaplan turbines, the largest in the world at that time. The existing CAM relationship was determined based on hydraulic model tests and checked by efficiency on-site tests. It was also tested based on turbine bearing vibrations. In order to discover vibrations and long cracks on stay vanes detailed on-site measurements were performed. Influence of the modification of the trailing edges on the dynamic stresses of the stay vanes is also shown. In order to improve power output transient regimes were analyzed, both experimentally and numerically. Reversible hydropower plant, a pioneer in Europe since it was the first Pump storage power plant constructed with the highest head pump-turbines in the world. Analyses of transient regimes discover some problems with S-shaped characteristics coupled with non-symmetrical penstock.

  16. Transient Diabetes Insipidus Following Cardiopulmonary Bypass.

    Science.gov (United States)

    Ekim, Meral; Ekim, Hasan; Yilmaz, Yunus Keser; Bolat, Ali

    2015-04-01

    Diabetes insipidus (DI) results from inadequate output of Antidiuretic Hormone (ADH) from the pituitary gland (central DI) or the inability of the kidney tubules to respond to ADH (nephrogenic DI). ADH is an octapeptide produced in the supraoptic and paraventricular nuclei of the hypothalamus and stored in the posterior lobe of the pituitary gland. Cardiopulmonary Bypass (CPB) has been shown to cause a six-fold increased circulating ADH levels 12 hours after surgery. However, in some cases, ADH release may be transiently suppressed due to cardioplegia (cardiac standstill) or CPB leading to DI. We present the postoperative course of a 60-year-old man who developed transient DI after CPB. He was successfully treated by applying nasal desmopressin therapy. Relevant biochemical parameters should be monitored closely in patients who produce excessive urine after open heart surgery.

  17. Operational transients: A regional administrator's view

    International Nuclear Information System (INIS)

    Collins, J.T.; Johnson, E.H.

    1984-01-01

    This chapter discusses the response of the regional US NRC to operational transients. Three of the major lessons learned from the Three Mile Island-2 accident are reviewed. The need to consider the more probable events of lesser consequences in addition to the significant events is now realized. The importance of the operator in the course of an operational event has been recognized. Three Mile Island also pointed out the many design and hardware deficiencies. Topics considered include the industry capability to meet the challenge of operational transients, the region's capability, and the capability of the utility. It is recommended that technical drills be developed, that plant-specific technical competence be improved, that operator training and education be improved, and that the attitude changes on the part of utilities and the nuclear industry in general be accelerated

  18. Characterization of highly transient EUV emitting discharges

    Energy Technology Data Exchange (ETDEWEB)

    Mullen, Joost van der; Kieft, Erik; Broks, Bart [Department of Applied Physics, Eindhoven University of Technology, PO Box 513, 5600 MB Eindhoven (Netherlands)

    2006-07-15

    The method of disturbed Bilateral Relations (dBR) is used to characterize highly transient plasmas that are used for the generation of Extreme Ultra Violet (EUV), i.e. radiation with a wavelength around 13.5 nm. This dBR method relates equilibrium disturbing to equilibrium restoring processes and follows the degree of equilibrium departure from the global down to the elementary plasma-level. The study gives global values of the electron density and electron temperature. Moreover, it gives a method to construct the atomic state distribution function (ASDF). This ASDF, which is responsible for the spectrum generated by the discharge, is found to be far from equilibrium. There are two reasons for this: first, systems with high charge numbers radiate strongly, second the highly transient behaviour makes that the distribution over the various ionization stages lags behind the temperature evolution.

  19. Characterization of highly transient EUV emitting discharges

    Science.gov (United States)

    van der Mullen, Joost; Kieft, Erik; Broks, Bart

    2006-07-01

    The method of disturbed Bilateral Relations (dBR) is used to characterize highly transient plasmas that are used for the generation of Extreme Ultra Violet (EUV), i.e. radiation with a wavelength around 13.5 nm. This dBR method relates equilibrium disturbing to equilibrium restoring processes and follows the degree of equilibrium departure from the global down to the elementary plasma-level. The study gives global values of the electron density and electron temperature. Moreover, it gives a method to construct the atomic state distribution function (ASDF). This ASDF, which is responsible for the spectrum generated by the discharge, is found to be far from equilibrium. There are two reasons for this: first, systems with high charge numbers radiate strongly, second the highly transient behaviour makes that the distribution over the various ionization stages lags behind the temperature evolution.

  20. Salbutamol for transient tachypnea of the newborn.

    Science.gov (United States)

    Moresco, Luca; Bruschettini, Matteo; Cohen, Amnon; Gaiero, Alberto; Calevo, Maria Grazia

    2016-05-23

    Transient tachypnea of the newborn is characterized by tachypnea and signs of respiratory distress. Transient tachypnea typically appears within the first two hours of life in term and late preterm newborns. Although transient tachypnea of the newborn is usually a self limited condition, it is associated with wheezing syndromes in late childhood. The rationale for the use of salbutamol (albuterol) for transient tachypnea of the newborn is based on studies showing that β-agonists can accelerate the rate of alveolar fluid clearance. To assess whether salbutamol compared to placebo, no treatment or any other drugs administered to treat transient tachypnea of the newborn, is effective and safe in the treatment of transient tachypnea of the newborn in infants born at 34 weeks' gestational age or more. We searched the Cochrane Central Register of Controlled Trials (CENTRAL, 2016, Issue 3), MEDLINE (1996 to March 2016), EMBASE (1980 to March 2016) and CINAHL (1982 to March 2016). We applied no language restrictions. We searched the abstracts of the major congresses in the field (Perinatal Society of Australia New Zealand and Pediatric Academic Societies) from 2000 to 2015 and clinical trial registries. Randomized controlled trials, quasi-randomized controlled trials and cluster trials comparing salbutamol versus placebo or no treatment or any other drugs administered to infants born at 34 weeks' gestational age or more and less than three days of age with transient tachypnea of the newborn. For each of the included trials, two review authors independently extracted data (e.g. number of participants, birth weight, gestational age, duration of oxygen therapy, need for continuous positive airway pressure and need for mechanical ventilation, duration of mechanical ventilation, etc.) and assessed the risk of bias (e.g. adequacy of randomization, blinding, completeness of follow-up). The primary outcomes considered in this review were duration of oxygen therapy, need for

  1. Automated source classification of new transient sources

    Science.gov (United States)

    Oertel, M.; Kreikenbohm, A.; Wilms, J.; DeLuca, A.

    2017-10-01

    The EXTraS project harvests the hitherto unexplored temporal domain information buried in the serendipitous data collected by the European Photon Imaging Camera (EPIC) onboard the ESA XMM-Newton mission since its launch. This includes a search for fast transients, missed by standard image analysis, and a search and characterization of variability in hundreds of thousands of sources. We present an automated classification scheme for new transient sources in the EXTraS project. The method is as follows: source classification features of a training sample are used to train machine learning algorithms (performed in R; randomForest (Breiman, 2001) in supervised mode) which are then tested on a sample of known source classes and used for classification.

  2. The SkyMapper Transient Survey

    Science.gov (United States)

    Scalzo, R. A.; Yuan, F.; Childress, M. J.; Möller, A.; Schmidt, B. P.; Tucker, B. E.; Zhang, B. R.; Onken, C. A.; Wolf, C.; Astier, P.; Betoule, M.; Regnault, N.

    2017-07-01

    The SkyMapper 1.3 m telescope at Siding Spring Observatory has now begun regular operations. Alongside the Southern Sky Survey, a comprehensive digital survey of the entire southern sky, SkyMapper will carry out a search for supernovae and other transients. The search strategy, covering a total footprint area of 2 000 deg2 with a cadence of ⩽5 d, is optimised for discovery and follow-up of low-redshift type Ia supernovae to constrain cosmic expansion and peculiar velocities. We describe the search operations and infrastructure, including a parallelised software pipeline to discover variable objects in difference imaging; simulations of the performance of the survey over its lifetime; public access to discovered transients; and some first results from the Science Verification data.

  3. Transient hypothyroidism following radioiodine therapy for thyrotoxicosis

    International Nuclear Information System (INIS)

    Connell, J.M.C.; McCruden, D.C.; Alexander, W.D.; Hilditch, T.E.

    1983-01-01

    A prospective study of thyroid function including serial tracer radioisotope uptake measurements in 55 patients treated with 131 I therapy is described. Five patients had an episode of transient hypothyroidism within eight months of treatment: in three of these patients this was due to impaired organification of iodide, with normal iodide trapping by the thyroid (as measured by a twenty minute 123 I uptake) being preserved. In contrast, in all patients who developed permanent hypothyroidism, iodide trapping was markedly diminished and did not recover. It is suggested that hypothyroidism due to organification failure following 131 I therapy is potentially short-lived; where hypothyroidism is associated with gross impairment of iodide trapping, recovery is unlikely. Early iodine uptake measurements may be of value in selecting those patients whose hypothyroidism is transient and who do not require permanent thyroid hormone replacement. (author)

  4. Constituents from <em>Vigna em>vexillata> and Their Anti-Inflammatory Activity

    Directory of Open Access Journals (Sweden)

    Guo-Feng Chen

    2012-08-01

    Full Text Available The seeds of <em>Vigna em>genus are important food resources and there have already been many reports regarding their bioactivities. In our preliminary bioassay, the chloroform layer of methanol extracts of<em> V. vexillata em>demonstrated significant anti-inflammatory bioactivity. Therefore, the present research is aimed to purify and identify the anti-inflammatory principles of <em>V. vexillataem>. One new sterol (1 and two new isoflavones (2,3 were reported from the natural sources for the first time and their chemical structures were determined by the spectroscopic and mass spectrometric analyses. In addition, 37 known compounds were identified by comparison of their physical and spectroscopic data with those reported in the literature. Among the isolates, daidzein (23, abscisic acid (25, and quercetin (40 displayed the most significant inhibition of superoxide anion generation and elastase release.

  5. Ultraviolet photoelectron spectroscopy of transient species

    International Nuclear Information System (INIS)

    Leeuw, D.M. de.

    1979-01-01

    Transient species are studied in the isolation of the gas phase using ultraviolet photoelectron spectroscopy (PES). A description of the equipment used and a discussion of some theoretical topics, which play a role in the interpretation of PE spectra, are given. Koopmans' theorem, Hartree-Fock-Slater (HFS) calculations and the sum rule are discussed. A versatile ultraviolet PE spectrometer, designed specifically for this purpose, has been built and the construction and performance of this instrument are described. (Auth.)

  6. Transient central diabetes insipidus following ischemic stroke

    Directory of Open Access Journals (Sweden)

    Muthukrishnan Jayaraman

    2013-01-01

    Full Text Available Central Diabetes Insipidus (CDI following ischemic infarction of the brain has been described as a rare presentation. Posterior pituitary ischemia has also been postulated as a possible cause of idiopathic CDI. We encountered a young male with bilateral extensive ischemic infarction sustained at high altitude, who had transient polyuria due to central diabetes insipidus, requiring desmopressin therapy. DI completely resolved during the course of his neurological recovery.

  7. Transient Seepage Analyses in Levee Engineering Practice

    Science.gov (United States)

    2016-07-01

    International, Ltd. of Calgary, Alberta , Canada. It is a stand-alone finite element seepage program that can do steady-state and transient seepage...arithmetic or logarithmic scale . Shown in Figure 4.7 is an alternative method of plotting the water content function. This type of plot clearly...the appropriate scaling or curve-fit parameters based on published results for specific soils, or individual parameters can be entered. 4.7

  8. Pump transients in FGD slurry systems

    International Nuclear Information System (INIS)

    Ponce-Campos, C.D., Thoy, C.T.

    1990-01-01

    In this paper, the start-up transient of a limestone slurry system used for a power plant scrubber is discussed. Particular characteristics of these kind of systems are pointed out and incorporated into an ad-hoc numerical model. Three possible start-up scenarios are discussed and compared with field experimental data. The results illustrate well the importance of air pocket purging prior to system start-up

  9. Transient Magnetic Field in a Conducting Cylinder

    Directory of Open Access Journals (Sweden)

    Zygmunt Piatek

    2004-01-01

    Full Text Available In the paper we determine the transient magnetic field in a conducting cylinder placed in external longitudinal sine-shaped magnetic field using the solution of Bessell equation in cylindrical co-ordinates, and also applying integral Laplace transformations, attenuation and diffusion of the magnetic field strength in the cylinder. The resulting equations can be used to describe volume density of the power lost in the cylinder and to determine substitute parameters of the inductor-cylindrical work system.

  10. Transient Modeling and Simulation of Compact Photobioreactors

    OpenAIRE

    Ribeiro, Robert Luis Lara; Mariano, André Bellin; Souza, Jeferson Avila; Vargas, Jose Viriato Coelho

    2008-01-01

    In this paper, a mathematical model is developed to make possible the simulation of microalgae growth and its dependency on medium temperature and light intensity. The model is utilized to simulate a compact photobioreactor response in time with physicochemical parameters of the microalgae Phaeodactylum tricornutum. The model allows for the prediction of the transient and local evolution of the biomass concentration in the photobioreactor with low computational time. As a result, the model is...

  11. Voltage-Step Transient on Circular Electrodes

    Czech Academy of Sciences Publication Activity Database

    Wein, Ondřej; Tovčigrečko, Valentin

    2011-01-01

    Roč. 41, č. 9 (2011), s. 1065-1075 ISSN 0021-891X R&D Projects: GA ČR GA104/08/0428; GA ČR GA104/09/0972 Institutional research plan: CEZ:AV0Z40720504 Keywords : ohmic loss * voltage-step transient * cottrell asymptote Subject RIV: CI - Industrial Chemistry, Chemical Engineering Impact factor: 1.745, year: 2011

  12. Could the cosmic acceleration be transient?

    Energy Technology Data Exchange (ETDEWEB)

    Guimaraes, Antonio C.C.; Lima, J.A.S. [Universidade de Sao Paulo (IAG/USP), SP (Brazil). Inst. de Astronomia, Geofisica e Ciencias Atmosfericas

    2011-07-01

    Full text: The possibility of a transient cosmic acceleration appears in several theoretical scenarios and is theoretically interesting because it solves some difficulties inherent to eternally accelerating universes (like {Lambda}CDM). On the observational side, some authors, using a dynamical Ansatz for the dark energy equation of state, have suggested that the cosmic acceleration have already peaked and that we are currently witnessing its slowing down. Here, a possible slowing down of the cosmic expansion is investigated through a cosmographic approach. By expanding the luminous distance to fourth order and fitting the SNe Ia data from the most recent compilations (Union, Constitution and Union 2), the marginal likelihood distribution for the deceleration parameter today indicates that there is a considerable probability for q{sub 0} > 0. Also in contrast to the prediction of the {Lambda}CDM model, the cosmographic q(z) reconstruction suggests that the cosmic acceleration could already have peaked and be presently slowing down, what would imply that the recent accelerated expansion of the Universe is a transient phenomenon. It is also shown that to describe a transient acceleration the luminous distance needs to be expanded at least to fourth order. The present cosmographic results depend neither on the validity of general relativity nor on the matter-energy contents of the Universe. (author)

  13. Detection of transient events on planetary bodies .

    Science.gov (United States)

    Di Martino, M.; Carbognani, A.

    Transient phenomena on planetary bodies are defined as luminous events of different intensities, which occur in planetary atmospheres and surfaces, their duration spans from about 0.1 s to some hours. They consist of meteors, bolides, lightning, impact flashes on solid surfaces, auroras, etc. So far, the study of these phenomena has been very limited, due to the lack of an ad hoc instrumentation, and their detection has been performed mainly on a serendipitous basis. Recently, ESA has issued an announcement of opportunity for the development of systems devoted to the detection of transient events in the Earth atmosphere and/or on the dark side of other planetary objects. One of such a detector as been designed and a prototype (\\textit{Smart Panoramic Optical Sensor Head}, SPOSH) has been constructed at Galileo Avionica S.p.A (Florence, Italy). For sake of clarity, in what follows, we classify the transient phenomena in ``Earth phenomena'' and ``Planetary phenomena'', even though some of them originate in a similar physical context.

  14. Transient dynamics in dynamic Leidenfrost phenomenon

    Science.gov (United States)

    Lee, Sanghyeon; Lee, Sang Jun; Lee, Ji San; Fezzaa, Kammel; Je, Junh Ho

    2017-11-01

    When a liquid droplet impinges on a superheated surface, the droplet can form a vapor layer toward the surface and bounce back, known as dynamic Leidenfrost phenomenon. Transient dynamics of the vapor layer before the droplet bounces back can play a critical role in many industrial technologies such as power plant cooling and engine combustion, but is not fully understood mostly due to lack of appropriate visualization methods. Here, we successfully visualize the transient dynamics using ultrafast X-ray imaging. We experimentally reveal that the initial vapor dome flattens to a vapor disk, which then grows in thickness (δ) following the Fourier's heat conduction law δ ΔT0.5t0.5 , where ΔT is the temperature difference across the vapor disk and t is the time after impact. Ripples generate near the periphery of the vapor disk as long as the thickness reaches a certain value ( 12.16 μm), afterwards rapidly growing in amplitude while propagating to the center. Interestingly, rippling enhances droplet evaporation rate significantly The transient dynamics will provide import insight in understanding and modelling of power plant cooling or engine performance.

  15. Transient selection in multicellular immune networks

    Science.gov (United States)

    Ivanchenko, M. V.

    2011-03-01

    We analyze the dynamics of a multi-clonotype naive T-cell population competing for survival signals from antigen-presenting cells. We find that this competition provides with an efficacious selection of clonotypes, making the less able and more repetitive get extinct. We uncover the scaling principles for large systems the extinction rate obeys and calibrate the model parameters to their experimental counterparts. For the first time, we estimate the physiological values of the T-cell receptor-antigen presentation profile recognition probability and T-cell clonotypes niche overlap. We demonstrate that, while the ultimate state is a stable fixed point, sequential transients dominate the dynamics over large timescales that may span over years, if not decades, in real time. We argue that what is currently viewed as "homeostasis" is a complex sequential transient process, while being quasi-stationary in the total number of T-cells only. The discovered type of sequential transient dynamics in large random networks is a novel alternative to the stable heteroclinic channel mechanism.

  16. Transient Thermoelectric Solution Employing Green's Functions

    Science.gov (United States)

    Mackey, Jon; Sehirlioglu, Alp; Dynys, Fred

    2014-01-01

    The study works to formulate convenient solutions to the problem of a thermoelectric couple operating under a time varying condition. Transient operation of a thermoelectric will become increasingly common as thermoelectric technology permits applications in an increasing number of uses. A number of terrestrial applications, in contrast to steady-state space applications, can subject devices to time varying conditions. For instance thermoelectrics can be exposed to transient conditions in the automotive industry depending on engine system dynamics along with factors like driving style. In an effort to generalize the thermoelectric solution a Greens function method is used, so that arbitrary time varying boundary and initial conditions may be applied to the system without reformulation. The solution demonstrates that in thermoelectric applications of a transient nature additional factors must be taken into account and optimized. For instance, the materials specific heat and density become critical parameters in addition to the thermal mass of a heat sink or the details of the thermal profile, such as oscillating frequency. The calculations can yield the optimum operating conditions to maximize power output andor efficiency for a given type of device.

  17. Initial Implementation of Transient VERA-CS

    Energy Technology Data Exchange (ETDEWEB)

    Gerlach, Andrew [Univ. of Michigan, Ann Arbor, MI (United States); Kochunas, Brendan [Univ. of Michigan, Ann Arbor, MI (United States); Salko, Robert [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Wysocki, Aaron J. [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

    2017-11-01

    In this milestone the capabilities of both CTF and MPACT were extended to perform coupled transient calculations. This required several small changes in MPACT to setup the problems correctly, perform the edits correctly, and call the appropriate CTF interfaces in the right order. For CTF, revisions and corrections to the transient timestepping algorithm were made, as well as the addition of a new interface subroutine to allow MPACT to drive CTF at each timestep. With the modifications completed, the initial coupled capability was demonstrated on some problems used for code verification, a hypothetical small mini-core, and a Watts Bar demonstration problem. For each of these cases the results showed good agreement with the previous MPACT internal TH feedback model that relied on a simplified fuel heat conduction model and simplified coolant treatment. After the pulse the results are notably different as expected, where the effects of convection of heat to the coolant can be observed. Areas for future work were discussed, including assessment and development of the CTF dynamic fuel deformation and gap conductance models, addition of suitable transient boiling and CHF models for the rapid heating and cooling rates seen in RIAs, additional validation and demonstration work, and areas for improvement to the code input and output capabilities.

  18. Aeroelastic Modeling of a Nozzle Startup Transient

    Science.gov (United States)

    Wang, Ten-See; Zhao, Xiang; Zhang, Sijun; Chen, Yen-Sen

    2014-01-01

    Lateral nozzle forces are known to cause severe structural damage to any new rocket engine in development during test. While three-dimensional, transient, turbulent, chemically reacting computational fluid dynamics methodology has been demonstrated to capture major side load physics with rigid nozzles, hot-fire tests often show nozzle structure deformation during major side load events, leading to structural damages if structural strengthening measures were not taken. The modeling picture is incomplete without the capability to address the two-way responses between the structure and fluid. The objective of this study is to develop a tightly coupled aeroelastic modeling algorithm by implementing the necessary structural dynamics component into an anchored computational fluid dynamics methodology. The computational fluid dynamics component is based on an unstructured-grid, pressure-based computational fluid dynamics formulation, while the computational structural dynamics component is developed under the framework of modal analysis. Transient aeroelastic nozzle startup analyses at sea level were performed, and the computed transient nozzle fluid-structure interaction physics presented,

  19. Transient Species in Plasmas Interacting with Liquids

    Science.gov (United States)

    Reuter, S.; Schmidt-Bleker, A.; van Helden, J. H.; Jablonowski, H.; Winter, J.; Santos Sousa, J.; Gianella, M.; Ritchie, G.; Weltmann, K.-D.

    2016-09-01

    Processes of non-equilibrium plasmas at gas-liquid interfaces are determined by transient species. Quantification of these species in the plasma, gas, or liquid is intricate and requires specific diagnostics. In order to study plasma-liquid interaction processes, novel diagnostic concepts need to be developed combined with simulations that allow an insight into the chemical reaction pathways. Significantly relevant transient species in plasmas operated in ambient air include HO2 and O2(a1 Δ) , which are diagnosed in this work. The aim is to link localized transient species with longer living stable species in the gas phase and in the liquid phase. Understanding reaction pathways makes it possible to control the reactive species composition generated by the cold plasmas, and further insight into plasma induced reactivity in condensed matter systems can be gained. The work shows a combination of absorption spectroscopic methods and other diagnostic techniques as well as simple kinetics modeling as a way to control the plasma chemical reactions.

  20. Respiratory effects of transient axial acceleration.

    Science.gov (United States)

    Loring, S H; Lee, H T; Butler, J P

    2001-06-01

    Whereas gravity has an inspiratory effect in upright subjects, transient upward acceleration is reported to have an expiratory effect. To explore the respiratory effects of transient axial accelerations, we measured axial acceleration at the head and transrespiratory pressure or airflow in five subjects as they were dropped or lifted on a platform. For the first 100 ms, upward acceleration caused a decrease in mouth pressure and inspiratory flow, and downward acceleration caused the opposite. We also simulated these experimental observations by using a computational model of a passive respiratory system based on anatomical data and normal respiratory characteristics. After 100 ms, respiratory airflow in our subjects became highly variable, no longer varying with acceleration. Electromyograms of thoracic and abdominal respiratory muscles showed bursts of activity beginning 40-125 ms after acceleration, suggesting reflex responses responsible for subsequent flow variability. We conclude that, in relaxed subjects, transient upward axial acceleration causes inspiratory airflow and downward acceleration causes expiratory airflow, but that after ~100 ms, reflex activation of respiratory musculature largely determines airflow.

  1. Transient Peripapillary Retinoschisis in Glaucomatous Eyes

    Directory of Open Access Journals (Sweden)

    Josine van der Schoot

    2017-01-01

    Full Text Available Purpose. To investigate transient focal microcystic retinoschisis in glaucomatous eyes in images obtained with several imaging techniques used in daily glaucoma care. Methods. Images of 117 glaucoma patients and 91 healthy subjects participating in a large prospective follow-up study into glaucoma imaging were reviewed. Participants were measured with spectral domain optical coherence tomography (SD-OCT, scanning laser polarimetry (SLP, scanning laser tomography (SLT, and standard automated perimetry (SAP. The presence of a focal retinoschisis in SD-OCT was observed and correlated to SLP, SLT, and SAP measurements, both cross-sectionally and longitudinally. Results. Seven out of 117 glaucoma patients showed a transient, localised, peripapillary, heterogeneous microcystic schisis of the retinal nerve fiber layer (RNFL and sometimes other retinal layers as well in SD-OCT. None of the healthy eyes showed this phenomenon nor did any of the other imaging techniques display it as detailed and consistently as did the SD-OCT. SAP showed a temporarily decreased focal retinal sensitivity during the retinoschisis and we found no signs of glaucomatous progression related to the retinoschisis. Conclusions. Transient microcystic retinoschisis appears to be associated with glaucomatous wedge defects in the RNFL. It was best observed with SD-OCT and it was absent in healthy eyes. We found no evidence that the retinoschisis predicted glaucomatous progression.

  2. Transient chaotic transport in dissipative drift motion

    Energy Technology Data Exchange (ETDEWEB)

    Oyarzabal, R.S. [Pós-Graduação em Ciências/Física, Universidade Estadual de Ponta Grossa, 84030-900, Ponta Grossa, PR (Brazil); Szezech, J.D. [Departamento de Matemática e Estatística, Universidade Estadual de Ponta Grossa, 84030-900, Ponta Grossa, PR (Brazil); Batista, A.M., E-mail: antoniomarcosbatista@gmail.com [Departamento de Matemática e Estatística, Universidade Estadual de Ponta Grossa, 84030-900, Ponta Grossa, PR (Brazil); Souza, S.L.T. de [Departamento de Física e Matemática, Universidade Federal de São João del Rei, 36420-000, Ouro Branco, MG (Brazil); Caldas, I.L. [Instituto de Física, Universidade de São Paulo, 05315-970, São Paulo, SP (Brazil); Viana, R.L. [Departamento de Física, Universidade Federal do Paraná, 81531-990, Curitiba, PR (Brazil); Sanjuán, M.A.F. [Departamento de Física, Universidad Rey Juan Carlos, Tulipán s/n, 28933 Móstoles, Madrid (Spain)

    2016-04-22

    Highlights: • We consider a situation for which a chaotic transient is present in the dynamics of the two-wave model with damping. • The damping in plasma models can be a way for study a realistic behavior of confinement due the collisional effect. • The escape time as a function of the damping obey a power-law scaling. • We have made a qualitative transport analysis with a simple model that can be useful for more complete models. • We have shown that the pattern of the basin of attraction depends on the damping parameter. - Abstract: We investigate chaotic particle transport in magnetised plasmas with two electrostatic drift waves. Considering dissipation in the drift motion, we verify that the removed KAM surfaces originate periodic attractors with their corresponding basins of attraction. We show that the properties of the basins depend on the dissipation and the space-averaged escape time decays exponentially when the dissipation increases. We find positive finite time Lyapunov exponents in dissipative drift motion, consequently the trajectories exhibit transient chaotic transport. These features indicate how the transient plasma transport depends on the dissipation.

  3. Transient birefringence effects in electromagnetically induced transparency

    International Nuclear Information System (INIS)

    Parshkov, O M

    2015-01-01

    We report the results of numerical modelling of transient birefringence that arises as a result of electromagnetically induced transparency on degenerate quantum transitions between the states with J = 0, 1 and 2 in the presence of the Doppler broadening of spectral lines. It is shown that in the case of a linearly polarised control field, the effect of transient birefringence leads to a decay of the input circularly polarised probe pulse into separate linearly polarised pulses inside a medium. In the case of a circularly polarised control field, the effect of transient birefringence manifests itself in a decay of the input linearly polarised probe pulse into separate circularly polarised pulses. It is shown that the distance that a probe pulse has to pass in a medium before decaying into subpulses is considerably greater in the first case than in the second. The influence of the input probe pulse power and duration on the process of spatial separation into individual pulses inside a medium is studied. A qualitative analysis of the obtained results is presented. (nonlinear optical phenomena)

  4. Review of HEDL fuel pin transient analyses analytical programs

    International Nuclear Information System (INIS)

    Scott, J.H.; Baars, R.E.

    1975-05-01

    Methods for analysis of transient fuel pin performance are described, as represented by the steady-state SIEX code and the PECT series of codes used for steady-state and transient mechanical analyses. The empirical fuel failure correlation currently in use for analysis of transient overpower accidents is described. (U.S.)

  5. 40 CFR 86.1333-90 - Transient test cycle generation.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 19 2010-07-01 2010-07-01 false Transient test cycle generation. 86... Procedures § 86.1333-90 Transient test cycle generation. (a) The heavy-duty transient engine cycles for Otto... question must be used. The generation of the maximum torque curve is described in § 86.1332. (3) The EPA...

  6. 40 CFR 86.1333-2010 - Transient test cycle generation.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 19 2010-07-01 2010-07-01 false Transient test cycle generation. 86... Exhaust Test Procedures § 86.1333-2010 Transient test cycle generation. (a) Generating transient test.... The generation of the maximum torque curve is described in 40 CFR part 1065. (b) Example of the...

  7. Fast Transients with the Square Kilometre Array and its Pathfinders ...

    Indian Academy of Sciences (India)

    are usually associated with explosive or dynamic events, and allow interesting new regimes of physics to be probed. The time scales for transient phenomena range from several months down to microseconds (or shorter). Short duration (<5 s) transients are perhaps the most exciting variety of transient events, and also the ...

  8. Avaliação do desempenho de dois sistemas modulares no tratamento anaeróbio de esgotos em comunidades rurais Performance evaluation of two modular systems for wastewater treatment in rural communities

    Directory of Open Access Journals (Sweden)

    Antônio Javarez Júnior

    2007-12-01

    Full Text Available Este trabalho apresenta uma alternativa de baixo custo e fácil instalação para o tratamento de esgotos de pequenas comunidades. O experimento foi desenvolvido no Campo Experimental da Faculdade de Engenharia Agrícola (FEAGRI/UNICAMP. O volume total de esgoto gerado na FEAGRI é de cerca de 20 m³ dia-1, sendo metade desse tratado pelos sistemas modulares. O sistema da linha (A é constituído por um reator UASB (Upflow Anaerobic Sludge Blanket, seguido de dois filtros anaeróbios e o outro sistema, linha (B, é constituído por um reator tipo RAC (Reator Anaeróbio Compartimentado, seguido de dois filtros anaeróbios (FA. Os sistemas foram operados de dezembro de 2002 a fevereiro de 2004, totalizando 30 coletas de amostras. Observou-se que, de maneira geral, o desempenho dos sistemas foram similares e com resultados satisfatórios. As eficiências médias de remoção de Sólidos Sedimentáveis, Sólidos Suspensos Totais e DQO, observadas no sistema modular da Linha (A, foram, respectivamente, 99,58%; 94,33% e 67,30%. O sistema modular da Linha (B apresentou remoção de 99,49%; 93,34% e 70,45% para os mesmos parâmetros. Os sistemas modulares mostraram-se adequados e viáveis para promover o tratamento sanitário do esgoto produzido em pequenas comunidades.This research work introduces an alternative of low cost and easily installable system for treatment of wastewater applied to small communities. These experiments were developed at Experimental Field of Agricultural Engineering College (AEC/UNICAMP. The total volume produced at AEC is 20 m³ day-1, and half part was treated by modular systems. The first system line (A is composed by an UASB reactor (Upflow Anaerobic Sludge Blanket followed by two Anaerobic Filters and the second system (B line is composed by a kind of reactor called CAR (Compartmented Anaerobic Reactor and it is followed by two Anaerobic filters too. Both systems were handled from December of 2002 through February of 2004

  9. 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

  10. Avaliação de 166 ETEs em operação no país, compreendendo diversas tecnologias. Parte 1: análise de desempenho Evaluation of 166 treatment plants operating in Brazil, comprising several technologies. Part 1: performance analysis

    Directory of Open Access Journals (Sweden)

    Sílvia M. A. Corrêa Oliveira

    2005-12-01

    Full Text Available O trabalho apresenta uma análise de desempenho de 166 estações de tratamento de esgotos urbanos em operação nos estados de Minas Gerais e de São Paulo. Foram investigadas seis modalidades de tratamento diferentes, compreendendo os processos: (a fossa séptica seguida de filtro anaeróbio, (b lagoas facultativas, (c lagoas anaeróbias seguidas por lagoas facultativas, (d lodos ativados, (e reatores UASB operando isoladamente e (f reatores UASB seguidos por pós-tratamento. A avaliação considerou as concentrações efluentes e as eficiências de remoção dos constituintes DBO, DQO, SST, NTK, PT e coliformes (organismos termotolerantes, que foram comparadas com valores típicos reportados na literatura técnica. Em geral, o desempenho na remoção de matéria orgânica esteve dentro do esperado. As eficiências de remoção de SST estiveram abaixo, enquanto a remoção de coliformes foi maior que a descrita na literatura. A remoção de nutrientes foi baixa, já que nenhuma das modalidades analisadas foi projetada com este objetivo.The paper analyses the performance of 166 wastewater treatment plants operating in Brazil. Six different treatment technologies have been investigated, comprising the following processes: septic tank + anaerobic filter, facultative pond, anaerobic pond + facultative pond, activated sludge, UASB reactors alone, UASB reactors followed by post-treatment. The objective of the research was to evaluate the effluent quality and the removal efficiencies of the parameters BOD, COD, TSS, coliforms, TKN and phosphorus. The paper compares the effluent quality and the removal efficiencies with typical values reported by the technical literature. In general, the performance in the removal of organic matter was as expected. TSS removal efficiencies were lower than reported, but coliform removal was higher than described in the literature. Nutrient removal was low, but none of the treatment processes have been designed with

  11. Epinephrine for transient tachypnea of the newborn.

    Science.gov (United States)

    Moresco, Luca; Calevo, Maria Grazia; Baldi, Federica; Cohen, Amnon; Bruschettini, Matteo

    2016-05-23

    Transient tachypnea of the newborn is characterized by tachypnea and signs of respiratory distress. Transient tachypnea typically appears within the first two hours of life in term and late preterm newborns. Although transient tachypnea of the newborn is usually a self limited condition, it is associated with wheezing syndromes in late childhood. The rationale for the use of epinephrine (adrenaline) for transient tachypnea of the newborn is based on studies showing that β-agonists can accelerate the rate of alveolar fluid clearance. To assess whether epinephrine compared to placebo, no treatment or any other drugs (excluding salbutamol) is effective and safe in the treatment of transient tachypnea of the newborn in infants born at 34 weeks' gestational age or more. We searched the Cochrane Central Register of Controlled Trials (CENTRAL, 2016, Issue 3), MEDLINE (1996 to March 2016), EMBASE (1980 to March 2016) and CINAHL (1982 to March 2016). We applied no language restrictions. We searched the abstracts of the major congresses in the field (Perinatal Society of Australia and New Zealand and Pediatric Academic Societies) from 2000 to 2015. Randomized controlled trials, quasi-randomized controlled trials and cluster trials comparing epinephrine versus placebo or no treatment or any other drugs administered to infants born at 34 weeks' gestational age or more and less than three days of age with transient tachypnea of the newborn. For the included trial, two review authors independently extracted data (e.g. number of participants, birth weight, gestational age, duration of oxygen therapy (hours), need for continuous positive airway pressure and need for mechanical ventilation, duration of mechanical ventilation, etc.) and assessed the risk of bias (e.g. adequacy of randomization, blinding, completeness of follow-up). The primary outcomes considered in this review were duration of oxygen therapy (hours), need for continuous positive airway pressure and need for

  12. ALL TRANSIENTS, ALL THE TIME: REAL-TIME RADIO TRANSIENT DETECTION WITH INTERFEROMETRIC CLOSURE QUANTITIES

    Energy Technology Data Exchange (ETDEWEB)

    Law, Casey J.; Bower, Geoffrey C. [Department of Astronomy and Radio Astronomy Laboratory, University of California, Berkeley, CA (United States)

    2012-04-20

    We demonstrate a new technique for detecting radio transients based on interferometric closure quantities. The technique uses the bispectrum, the product of visibilities around a closed loop of baselines of an interferometer. The bispectrum is calibration independent, resistant to interference, and computationally efficient, so it can be built into correlators for real-time transient detection. Our technique could find celestial transients anywhere in the field of view and localize them to arcsecond precision. At the Karl G. Jansky Very Large Array (VLA), such a system would have a high survey speed and a 5{sigma} sensitivity of 38 mJy on 10 ms timescales with 1 GHz of bandwidth. The ability to localize dispersed millisecond pulses to arcsecond precision in large volumes of interferometer data has several unique science applications. Localizing individual pulses from Galactic pulsars will help find X-ray counterparts that define their physical properties, while finding host galaxies of extragalactic transients will measure the electron density of the intergalactic medium with a single dispersed pulse. Exoplanets and active stars have distinct millisecond variability that can be used to identify them and probe their magnetospheres. We use millisecond timescale visibilities from the Allen Telescope Array and VLA to show that the bispectrum can detect dispersed pulses and reject local interference. The computational and data efficiency of the bispectrum will help find transients on a range of timescales with next-generation radio interferometers.

  13. Pressurizer and steam-generator behavior under PWR transient conditions

    International Nuclear Information System (INIS)

    Wahba, A.B.; Berta, V.T.; Pointner, W.

    1983-01-01

    Experiments have been conducted in the Loss-of-Fluid Test (LOFT) pressurized water reactor (PWR), at the Idaho National Engineering Laboratory, in which transient phenomena arising from accident events with and without reactor scram were studied. The main purpose of the LOFT facility is to provide data for the development of computer codes for PWR transient analyses. Significant thermal-hydraulic differences have been observed between the measured and calculated results for those transients in which the pressurizer and steam generator strongly influence the dominant transient phenomena. Pressurizer and steam generator phenomena that occurred during four specific PWR transients in the LOFT facility are discussed. Two transients were accompanied by pressurizer inflow and a reduction of the heat transfer in the steam generator to a very small value. The other two transients were accompanied by pressurizer outflow while the steam generator behavior was controlled

  14. Transient response of a proton exchange membrane fuel cell

    Science.gov (United States)

    Weydahl, Helge; Møller-Holst, Steffen; Hagen, Georg; Børresen, Børre

    The transient response of a proton exchange membrane fuel cell (PEMFC) supplied with pure hydrogen and oxygen was investigated by load step measurements assisted by electrochemical impedance spectroscopy and chronoamperometry. Using an in-house designed resistance board, the uncontrolled response in both cell voltage and current upon step changes in a resistive load was observed. The PEMFC was found to respond quickly and reproducibly to load changes. The transient PEMFC response was limited by a cathodic charge transfer process with a potential-dependent response time. For load steps to high-current densitities, a second transient process with a constant response time was observed. This transient was offset from the charge transfer transient by a temporarily stable plateau. Results from chronoamperometry indicated that the second transient could be related to a diffusion process. Transient paths were plotted in the V- i diagram, matching a predicted pattern with overshooting cell voltage and current during a load step.

  15. Transient fault behavior in a microprocessor: A case study

    Science.gov (United States)

    Duba, Patrick

    1989-01-01

    An experimental analysis is described which studies the susceptibility of a microprocessor based jet engine controller to upsets caused by current and voltage transients. A design automation environment which allows the run time injection of transients and the tracing from their impact device to the pin level is described. The resulting error data are categorized by the charge levels of the injected transients by location and by their potential to cause logic upsets, latched errors, and pin errors. The results show a 3 picoCouloumb threshold, below which the transients have little impact. An Arithmetic and Logic Unit transient is most likely to result in logic upsets and pin errors (i.e., impact the external environment). The transients in the countdown unit are potentially serious since they can result in latched errors, thus causing latent faults. Suggestions to protect the processor against these errors, by incorporating internal error detection and transient suppression techniques, are also made.

  16. Caracterização de Polímeros e Determinação de Constituintes Inorgânicos em Embalagens Plásticas Metalizadas

    Directory of Open Access Journals (Sweden)

    Soares Eufemia P.

    2002-01-01

    Full Text Available Este trabalho apresenta os resultados analíticos da determinação de elementos químicos em materiais plásticos metalizados, obtidos por análise por ativação com nêutrons (NAA e os resultados da identificação de polímeros por espectroscopia no infravermelho (IR e calorimetria exploratória diferencial (DSC. Foram coletadas amostras de plásticos metalizados de embalagens de alimentos e cosméticos. Os resultados dos testes IR e DSC indicaram que os tipos de polímeros usados em plásticos metalizados são polietileno, polipropileno, poli(tereftalato de etileno e poliestireno. A NAA consistiu em irradiar as amostras e padrões com fluxo de nêutrons térmicos do reator nuclear IEA-R1, seguido da medida da atividade dos raios gama induzidos usando um detector de Germânio hiperpuro acoplado ao espectrômetro de raios gama. Elementos tóxicos como arsênio, cádmio, cromo, níquel e antimônio assim como elementos não tóxicos como bário, cálcio, cobalto, ferro, escândio, selênio e zinco foram determinados e suas concentrações apresentaram grande variabilidade entre as amostras. A análise de polímeros e elementos tóxicos é de grande interesse para o desenvolvimento de processos adequados e seguros para reciclagem e incineração de embalagens plásticas metalizadas, sem causar danos ao ambiente.

  17. Chromium uptake from aqueous effluents by immobilized Baker's yeast Utilização de leveduras de panificação na remoção de cromo em meio aquoso

    Directory of Open Access Journals (Sweden)

    Lucia Beckmann C. Menezes

    1998-10-01

    Full Text Available Baker’s yeast immobilized in alginate was used to take up chromium from effluents. Chromium in aqueous solutions were used in different concentrations. To evaluate the viability and efficiency the baker’s yeast for chromium uptake from effluents three experiments done in two differents reactor systems: first in system 1 at 17.5 ml/s and with 10, 20, 25 and 30 mg/l Cr; second in system 2 at 38.7 ml/s with 20 mg/l Cr; third in system 2.1 at 6.65 ml/s and with 20, 30 and 40 mg/l Cr. The efficiency of chromium uptake varied between 86 and 100 %.Leveduras de panificação imobilizadas em alginato, foram utilizadas com o objetivo de promover a remoção de cromo presente em efluentes. Trabalhou-se com soluções de cromo de diferentes concentrações. A fim de avaliar a viabilidade e eficiência do uso de leveduras de panificação na remoção de cromo, três experimentos foram realizados em dois diferentes sistemas de reatores: o primeiro no sistema 1 com 17,5 ml/s e 10, 20, 25 e 30 mg/l Cr; o segundo no sistema 2 com 38,7 ml/s e 20 mg/l Cr; o terceiro no sistema 2.1 com 6,65 ml/s e 20, 30 e 40 mg/l Cr. A média das eficiências de retenção do cromo variaram entre 86 e 100%.

  18. Dermatoses em renais cronicos em terapia dialitica

    Directory of Open Access Journals (Sweden)

    Luis Alberto Batista Peres

    2014-03-01

    Full Text Available Objetivo: As desordens cutâneas e das mucosas são comuns em pacientes em hemodiálise a longo prazo. A diálise prolonga a expectativa de vida, dando tempo para a manifestação destas anormalidades. Os objetivos deste estudo foram avaliar a prevalência de problemas dermatológicos em pacientes com doença renal crônica (DRC em hemodiálise. Métodos: Cento e quarenta e cinco pacientes com doença renal crônica em hemodiálise foram estudados. Todos os pacientes foram completamente analisados para as alterações cutâneas, de cabelos, mucosas e unhas por um único examinador e foram coletados dados de exames laboratoriais. Os dados foram armazenados em um banco de dados do Microsolft Excel e analisados por estatística descritiva. As variáveis contínuas foram comparadas pelo teste t de Student e as variáveis categóricas utilizando o teste do qui-quadrado ou o teste Exato de Fischer, conforme adequado. Resultados: O estudo incluiu 145 pacientes, com idade média de 53,6 ± 14,7 anos, predominantemente do sexo masculino (64,1% e caucasianos (90,0%. O tempo médio de diálise foi de 43,3 ± 42,3 meses. As principais doenças subjacentes foram: hipertensão arterial em 33,8%, diabetes mellitus em 29,6% e glomerulonefrite crônica em 13,1%. As principais manifestações dermatológicas observadas foram: xerose em 109 (75,2%, equimose em 87 (60,0%, prurido em 78 (53,8% e lentigo em 33 (22,8% pacientes. Conclusão: O nosso estudo mostrou a presença de mais do que uma dermatose por paciente. As alterações cutâneas são frequentes em pacientes em diálise. Mais estudos são necessários para melhor caracterização e manejo destas dermatoses.

  19. Emittance growth from transient coherent synchrotron radiation

    International Nuclear Information System (INIS)

    Bohn, C.L.; Li, R.; Bisognano, J.J.

    1996-01-01

    If the energies of individual particles in a bunch change as the bunch traverses a bending system, even if it is achromatic, betatron oscillations can be excited. Consequently, the transverse emittance of the bunch will grow as it moves downstream. Short bunches may be particularly susceptible to emission of coherent synchrotron radiation which can act back on the particles to change their energies and trajectories. Because a bend spans a well-defined length and angle, the bunch-excited wakefield and its effect back on the bunch are inherently transient. We outline a recently developed theory of this effect and apply it to example bending systems

  20. Future Transient Testing of Advanced Fuels

    Energy Technology Data Exchange (ETDEWEB)

    Jon Carmack

    2009-09-01

    The transient in-reactor fuels testing workshop was held on May 4–5, 2009 at Idaho National Laboratory. The purpose of this meeting was to provide a forum where technical experts in transient testing of nuclear fuels could meet directly with technical instrumentation experts and nuclear fuel modeling and simulation experts to discuss needed advancements in transient testing to support a basic understanding of nuclear fuel behavior under off-normal conditions. The workshop was attended by representatives from Commissariat à l'Énergie Atomique CEA, Japanese Atomic Energy Agency (JAEA), Department of Energy (DOE), AREVA, General Electric – Global Nuclear Fuels (GE-GNF), Westinghouse, Electric Power Research Institute (EPRI), universities, and several DOE national laboratories. Transient testing of fuels and materials generates information required for advanced fuels in future nuclear power plants. Future nuclear power plants will rely heavily on advanced computer modeling and simulation that describes fuel behavior under off-normal conditions. TREAT is an ideal facility for this testing because of its flexibility, proven operation and material condition. The opportunity exists to develop advanced instrumentation and data collection that can support modeling and simulation needs much better than was possible in the past. In order to take advantage of these opportunities, test programs must be carefully designed to yield basic information to support modeling before conducting integral performance tests. An early start of TREAT and operation at low power would provide significant dividends in training, development of instrumentation, and checkout of reactor systems. Early start of TREAT (2015) is needed to support the requirements of potential users of TREAT and include the testing of full length fuel irradiated in the FFTF reactor. The capabilities provided by TREAT are needed for the development of nuclear power and the following benefits will be realized by

  1. Human factors considerations in operational transients

    International Nuclear Information System (INIS)

    Meyer, O.R.

    1984-01-01

    The nuclear power industry is approaching the state-of-the-art in the recognition of human factors considerations and their impact on plant transients and plant operation. The importance of integrating human factors into systems engineering analysis has also been recognized. There is still a need for more open recognition and use of human reliability analysis as a tool for risk management. It can, for example, identify where more, or better, planning, procedures, training, and drills are needed to achieve a desired level of risk during the entire life of a plant. (orig.)

  2. Transient vibration of thin viscoelastic orthotropic plates

    Czech Academy of Sciences Publication Activity Database

    Soukup, J.; Valeš, František; Volek, J.; Skočilas, J.

    2011-01-01

    Roč. 27, č. 1 (2011), s. 98-107 ISSN 0567-7718. [International Conference on Dynamical Systems - Theory and Applications /10./. Lodz, 07.12.2009-10.12.2009] R&D Projects: GA ČR GA101/07/0946 Institutional research plan: CEZ:AV0Z20760514 Keywords : transient vibration thin plate * orthotropic * general viscoelastic standard solid Subject RIV: BI - Acoustics Impact factor: 0.860, year: 2011 http://www.springerlink.com/content/hn67324178846n4r/

  3. Transient gas flow through layered porous media

    International Nuclear Information System (INIS)

    Morrison, F.A. Jr.

    1975-01-01

    Low Reynolds number isothermal flow of an ideal gas through layered porous material was investigated analytically. Relations governing the transient flow in one dimension are obtained. An implicit, iterative, unconditionally stable finite difference scheme is developed for calculation of such flows. A computer code, SIROCCO, employing this technique has been written and implemented on the LLL computer system. A listing of the code is included. This code may be effectively applied to the evaluation of stemming plans for underground nuclear experiments. (U.S.)

  4. Coexistent transient pulmonary edema and pericardial effusion

    International Nuclear Information System (INIS)

    Newman, B.; Oh, K.S.; Pittsburgh Univ., PA; Park, S.C.

    1988-01-01

    Eight (23%) of 35 children with acute pericardial effusions due to infection or juvenile rheumatoid arthritis (JRA) had associated transient pulmonary edema demonstrated on plain chest radiographs. The presence or absence of radiographic pulmonary edema correlated well with clinical and hemodynamic parameters in patients with JRA but not in those with infectious pericarditis. There was no definite relationship between radiographic edema and amount of pericardial fluid as estimated echocardiographically or removed at pericardiocentesis. Rapidity of pericardial fluid accumulation could not be assessed in this study. Children of young age with underlying JRA were the most likely subjects to have radiographic pulmonary edema in conjunction with an acute pericardial effusion. (orig.)

  5. The qualitative criterion of transient angle stability

    DEFF Research Database (Denmark)

    Lyu, R.; Xue, Y.; Xue, F.

    2015-01-01

    In almost all the literatures, the qualitative assessment of transient angle stability extracts the angle information of generators based on the swing curve. As the angle (or angle difference) of concern and the threshold value rely strongly on the engineering experience, the validity and robust...... of these criterions are weak. Based on the stability mechanism from the extended equal area criterion (EEAC) theory and combining with abundant simulations of real system, this paper analyzes the criterions in most literatures and finds that the results could be too conservative or too optimistic. It is concluded...

  6. Analytic models for fuel pin transient performance

    International Nuclear Information System (INIS)

    Bard, F.E.; Fox, G.L.; Washburn, D.F.; Hanson, J.E.

    1976-09-01

    HEDL's ability to analyze various mechanisms that operate within a fuel pin has progressed substantially through development of codes such as PECTCLAD, which solves cladding response, and DSTRESS, which solves fuel response. The PECTCLAD results show good correlation with a variety of mechanical tests on cladding material and also demonstrate the significance of cladding strength when applying the life fraction rule. The DSTRESS results have shown that fuel deforms sufficiently during overpower transient tests that available volumes are filled, whether in the form of a central cavity or start-up cracks

  7. Transient Mixed Convection Validation for NGNP

    International Nuclear Information System (INIS)

    Smith, Barton; Schultz, Richard

    2015-01-01

    The results of this project are best described by the papers and dissertations that resulted from the work. They are included in their entirety in this document. They are: (1) Jeff Harris PhD dissertation (focused mainly on forced convection); (2) Blake Lance PhD dissertation (focused mainly on mixed and transient convection). This dissertation is in multi-paper format and includes the article currently submitted and one to be submitted shortly; and, (3) JFE paper on CFD Validation Benchmark for Forced Convection.

  8. Transient localization in the kicked Rydberg atom

    International Nuclear Information System (INIS)

    Persson, Emil; Fuerthauer, S.; Burgdoerfer, J.; Wimberger, S.

    2006-01-01

    We investigate the long-time limit of quantum localization of the kicked Rydberg atom. The kicked Rydberg atom is shown to possess in addition to the quantum localization time τ L a second crossover time t D where quantum dynamics diverges from classical dynamics towards increased instability. The quantum localization is shown to vanish as either the strength of the kicks at fixed principal quantum number or the quantum number at fixed kick strength increases. The survival probability as a function of frequency in the transient localization regime τ L D is characterized by highly irregular, fractal-like fluctuations

  9. Transient heat transfer characteristics of liquid helium

    International Nuclear Information System (INIS)

    Tsukamoto, Osami

    1976-01-01

    The transient heat transfer characteristics of liquid helium are investigated. The critical burnout heat fluxes for pulsive heating are measured, and empirical relations between the critical burnout heat flux and the length of the heat pulse are given. The burnout is detected by observing the super-to-normal transition of the temperature sensor which is a thin lead film prepared on the heated surface by vacuum evaporation. The mechanism of boiling heat transfer for pulsive heating is discussed, and theoretical relations between the critical burnout heat flux and the length of the heat pulse are derived. The empirical data satisfy the theoretical relations fairly well. (auth.)

  10. Recognition of Transient Phenomena in a Biosignal

    Directory of Open Access Journals (Sweden)

    J. Rozman

    2000-04-01

    Full Text Available Electrical Activity of a human brain measured on the skull(electroencephalogram, EEG contains in the sleep period manytransients (sleep spindles, spike-like structures or vertex waves, i.e. bursts of EEG activity of limited duration, having random occurrenceand may be coupled with specific sleep stages. A computer-baseddetector was designed that detects a transient called K-complex. Thedetector is based on linear matched filtering and its nonlinearmodifications. The linear and nonlinear approaches are compared andevaluated with respect to the detection efficiency.

  11. Transient Mixed Convection Validation for NGNP

    Energy Technology Data Exchange (ETDEWEB)

    Smith, Barton [Utah State Univ., Logan, UT (United States); Schultz, Richard [Idaho National Lab. (INL), Idaho Falls, ID (United States)

    2015-10-19

    The results of this project are best described by the papers and dissertations that resulted from the work. They are included in their entirety in this document. They are: (1) Jeff Harris PhD dissertation (focused mainly on forced convection); (2) Blake Lance PhD dissertation (focused mainly on mixed and transient convection). This dissertation is in multi-paper format and includes the article currently submitted and one to be submitted shortly; and, (3) JFE paper on CFD Validation Benchmark for Forced Convection.

  12. Future Transient Testing of Advanced Fuels

    International Nuclear Information System (INIS)

    Carmack, Jon

    2009-01-01

    The transient in-reactor fuels testing workshop was held on May 4-5, 2009 at Idaho National Laboratory. The purpose of this meeting was to provide a forum where technical experts in transient testing of nuclear fuels could meet directly with technical instrumentation experts and nuclear fuel modeling and simulation experts to discuss needed advancements in transient testing to support a basic understanding of nuclear fuel behavior under off-normal conditions. The workshop was attended by representatives from Commissariat energie Atomique CEA, Japanese Atomic Energy Agency (JAEA), Department of Energy (DOE), AREVA, General Electric - Global Nuclear Fuels (GE-GNF), Westinghouse, Electric Power Research Institute (EPRI), universities, and several DOE national laboratories. Transient testing of fuels and materials generates information required for advanced fuels in future nuclear power plants. Future nuclear power plants will rely heavily on advanced computer modeling and simulation that describes fuel behavior under off-normal conditions. TREAT is an ideal facility for this testing because of its flexibility, proven operation and material condition. The opportunity exists to develop advanced instrumentation and data collection that can support modeling and simulation needs much better than was possible in the past. In order to take advantage of these opportunities, test programs must be carefully designed to yield basic information to support modeling before conducting integral performance tests. An early start of TREAT and operation at low power would provide significant dividends in training, development of instrumentation, and checkout of reactor systems. Early start of TREAT (2015) is needed to support the requirements of potential users of TREAT and include the testing of full length fuel irradiated in the FFTF reactor. The capabilities provided by TREAT are needed for the development of nuclear power and the following benefits will be realized by the

  13. Implementation and Testing of the First Prompt Search for Gravitational Wave Transients with Electromagnetic Counterparts

    Science.gov (United States)

    Abadie, J.; Abbott, B. P.; Abbott, R.; Abbott, T. D.; Abernathy, M.; Accadia, T.; Acernese, F.; Adams, C.; Adhikari, R.; Affeldt, C.; hide

    2012-01-01

    Aims. A transient astrophysical event observed in both gravitational wave (GW) and electromagnetic (EM) channels would yield rich scientific rewards. A first program initiating EM follow-ups to possible transient GW events has been developed and exercised by the LIGO and Virgo community in association with several partners. In this paper, we describe and evaluate the methods used to promptly identify and localize GW event candidates and to request images of targeted sky locations. Methods. During two observing periods (Dec. 17, 2009 to Jan. 8, 2010 and Sep. 2 to Oct. 20, 2010), a low-latency analysis pipeline was used to identify GW event candidates and to reconstruct maps of possible sky locations. A catalog of nearby galaxies and MilkyWay globular clusters was used to select the most promising sky positions to be imaged, and this directional information was delivered to EM observatories with time lags of about thirty minutes. A Monte Carlo simulation has been used to evaluate the low-latency GW pipeline's ability to reconstruct source positions correctly. Results. For signals near the detection threshold, our low-latency algorithms often localized simulated GW burst signals to tens of square degrees, while neutron star/neutron star inspirals and neutron star/black hole inspirals were localized to a few hundred square degrees. Localization precision improves for moderately stronger signals. The correct sky location of signals well above threshold and originating from nearby galaxies may be observed with 50% or better probability with a few pointings of wide-field telescopes.

  14. Transient solute transport with sorption in Poiseuille flow

    Science.gov (United States)

    Hesse, M. A.; Zhang, L.; Wang, M.

    2016-12-01

    Sorption onto the wall has been observed to both increase [Lungu and Moffatt, 1982] and decrease the average solute transport velocity [Golay, 1958], relative to the mean flow velocity. Similarly, opposite conclusion have been reached for the effect of sorption on dispersion. In this work, we study transient solute transport in Poiseuille flow with sorptive boundary and initial transversely uniform distribution (linear release) to reconcile the two different views on solute transport (figure 1) with sorption. Two-dimensional simulations in figure 2 show that there is a transition from fast transport dominated by a fast-moving pulse in the middle of the channel at early times, to slow transport at late times once desorption from the walls becomes important. A set of series solutions for zeroth, first and second longitudinal moment have been derived and we show that the zeroth-order term in the solution corresponds to the slow transport in the late regime, while the first-order term corresponds to the fast transport in the early regime (figure 3). Based on the analytical solution, the time scales for early regime and late regimes of both the velocity and the dispersion coefficient have been determined for an equilibrium sorption model and a kinetic linear sorption model. Furthermore, we give approximated analytical solution when both adsorption and desorption are slow. References M.J.E. Golay. Theory of chromatography in open and coated tubular columns iwth round and rectangular cross-sections. In D.H.Desty, editor, Gas Chromatography, pages 36-53, New York, 1958. Academic Press Inc. E.M. Lungu and H.K. Moffatt. the effect of wall conductance on heat diffusion in duct flow. Journal of Engineering Mathematics, 1692 ;121-136, 1982.

  15. PRODUÇÃO E AVALIAÇÃO DE CARVÕES ATIVADOS OBTIDOS EM DIFERENTES FASES DE ESTABILIZAÇÃO DO LODO DE ESGOTO

    Directory of Open Access Journals (Sweden)

    Glaydson Simões dos Reis

    2015-01-01

    Full Text Available O aumento exponencial na produção de lodo de esgoto, decorrente da melhoria dossistemas de tratamento sanitário em grandes centro urbanos, pode representar um problemaambiental se este não for disposto adequadamente. Converter lodo de esgoto em adsorventesatravés da pirólise tem sido proposto desde 1971 como alternativa a destinação final desteresíduo. Como alternativa para disposição do excesso de lodo que é retirado do reator UASBna Estação de Tratamento de Esgoto Subaé, Feira de Santana, Bahia, a proposta deste trabalhofoi obter carvão ativado em diferentes fases de estabilização do lodo de esgoto e avaliar suacapacidade de adsorção na remoção do azul de metileno em solução aquosa. As propriedadesdo lodo como sólidos totais e voláteis totais, carbono orgânico, nitrogênio, foramdeterminadas seguindo recomendações do Standard Methods APHA. As amostras de lodoforam pirolisadas a 450°C sob atmosfera inerte e o carvão ativado produzido foi caracterizadopor CHN, adsorção de nitrogênio e ensaios de adsorção. Pelas análises físico-químicas, o lodode esgoto apresentou baixos teores de carbono e nutrientes, independentemente do tempo deretenção no leito de secagem, quando comparados a típicos Iodos de sistemas anaeróbios. Osespectros de infravermelho confirmam a presença de grande quantidade de silicatosdecorrente da baixa eficiência da ETE-Subaé. Os ensaios de adsorção, usando o azul demetileno como adsorvato, mostraram que estes carvões são adsorventes potenciais pararemoção de corantes em efluentes líquidos. As isotermas de adsorção foram estudadas e osresultados foram ajustados pelos modelos de Langmuir e Freundlich. O modelo de Langmuirdescreveu melhor o processo de adsorção. Os resultados da adsorção, grau de enriquecimentode carbono e a razão molar N/C, indicaram que a melhor amostra para preparar carvão ativadoda ETE-Subaé é o lodo LES08, àquela que permaneceu mais tempo no leito

  16. Phenolic compounds and antioxidant activity in fermented rice (Oryza sativa bran Compostos fenólicos e atividade antioxidante em farelo de arroz (Oryza sativa fermentado

    Directory of Open Access Journals (Sweden)

    Melissa dos Santos Oliveira

    2012-09-01

    Full Text Available This study investigated the content of total phenolic compounds and antioxidant activity in fermented rice bran in order to evaluate the effect of solid state fermentation on these properties. The process was performed with the fungus Rhizopus oryzae CTT 1217 in tray reactors at 30 °C for 120 hours. Samples of fermented rice bran were collected every 24 hours. Antioxidant property was evaluated by the diphenyl-1-picrylhydrazyl radical scavenging method and through the inhibition of enzymatic oxidation and lipid peroxidation of olive oil. The methanol extract of the biomass obtained at 96 hours of fermentation inactivated 50% of free radical in 15 minutes. The same extract reduced the peroxide value in the olive oil by 57% after 30 days of storage. The aqueous extract of the biomass obtained at 120 hours was the most efficient inhibitor of the darkening reaction catalyzed by peroxidase.Este trabalho investigou o conteúdo de compostos fenólicos totais e a atividade antioxidante em farelo de arroz fermentado, com o objetivo de avaliar o efeito da fermentação em estado sólido nessas propriedades. O processo foi realizado com o fungo Rhizopus oryzae CTT 1217 em reatores de bandeja a 30 °C por 120 horas. Amostras de farelo de arroz fermentado foram coletadas a cada 24 horas. A capacidade antioxidante foi avaliada pelo método do sequestro do radical livre difenil-1-picrilhidrazil e também por meio da inibição da oxidação enzimática e da peroxidação lipídica do óleo de oliva. O extrato metanólico produzido com a biomassa de 96 horas sequestrou 50% do radical livre em 15 minutos. O mesmo extrato reduziu o índice de peróxido no óleo em 57% após 30 dias de armazenamento. O extrato aquoso obtido da biomassa de 120 horas foi o inibidor mais eficiente da reação de escurecimento enzimático catalisada pela peroxidase.

  17. Physical Origin of Transient Negative Capacitance in a Ferroelectric Capacitor

    Science.gov (United States)

    Chang, Sou-Chi; Avci, Uygar E.; Nikonov, Dmitri E.; Manipatruni, Sasikanth; Young, Ian A.

    2018-01-01

    Transient negative differential capacitance, the dynamic reversal of transient capacitance in an electrical circuit, is of highly technological and scientific interest since it probes the foundation of ferroelectricity. We study a resistor-ferroelectric capacitor (R -FEC) network through a series of coupled equations based on Kirchhoff's law, electrostatics, and Landau theory. We show that transient negative capacitance (NC) in a R -FEC circuit originates from the mismatch in switching rate between the free charge on the metal plate and the bound charge in a ferroelectric (FE) capacitor during the polarization switching. This transient free charge-polarization mismatch is driven by the negative curvature of the FE free-energy landscape, and it is also analytically shown that a free-energy profile with a negative curvature is the only physical system that can describe transient NC in a R -FEC circuit. Furthermore, transient NC induced by the free charge-polarization mismatch is justified by its dependence on both external resistance and the intrinsic FE viscosity coefficient. The depolarization effect on FE capacitors emphasizes the importance of negative curvature to transient NC and also implies that transient and steady-state NC cannot be observed in a FE capacitor simultaneously. Finally, using the transient NC measurements, a procedure to experimentally determine the viscosity coefficient is presented to provide more insight into the relation between transient NC and the FE free-energy profile.

  18. CANDU fuel behaviour under transient conditions

    International Nuclear Information System (INIS)

    Segel, A.W.L.

    1979-04-01

    The Canadian R and D program to understand CANDU fuel behaviour under transient conditions is described. Fuel sheath behaviour studies have led to the development of a model of transient plastic strain in inert gas, which integrates the deformation due to several mechanisms. Verification tests demonstrated that on average the model overpredicts strain by 20%. From oxidation kinetics studies a sheath failure embrittlement criterion based on oxygen distribution has been developed. We have also established a rate equation for high-temperature stress-dependent crack formation due to embrittlement of the sheath by beryllium. An electric, simulated fuel element is being used in laboratory tests to characterize the behaviour of fuel in the horizontal. In-reactor, post-dryout tests have been done for several years. There is an axially-segmented, axisymmetric fuel element model in place and a fully two-dimensional code is under development. Laboratory testing of bundles, in its early stages, deals with the effects of geometric distortion and sheath-to-sheath interaction. In-reactor, post-dryout tests of CANDU fuel bundles with extensive central UO 2 melting did not result in fuel fragmentation nor damage to the pressure tube. (author)

  19. Classification of transients by distance measures

    Science.gov (United States)

    Park, Sae Na

    Due to a rapidly increasing size of data in astronomical surveys, statistical methods which can automatically classify newly detected celestial objects in an accurate and efficient way have become essential. In this dissertation, we introduce two methodologies to classify variable stars and transients by using light curves, which are graphs of magnitude (the logarithm measure of brightness of a star) as a function of time. Our analysis focuses on characterizing light curves by using magnitude changes over time increments and developing a classifier with this information. First we present the classifier based on the difference between two distributions of magnitudes, estimated by the statistical distance measures such as the Kullback-Leibler divergence, the Jensen-Shannon divergence, and the Hellinger distance. Also, we propose a method that groups magnitudes and times by binning and uses frequencies in each bin as the variables for classification. Along with these two methods, a way to incorporate other measures into our classifiers, which have been used for classification of light curves, is presented. Finally, the proposed methods are demonstrated with real data and compared with the past classification methods of variable stars and transients. iii.

  20. Transient Global Amnesia: A Case Report

    Directory of Open Access Journals (Sweden)

    Richard Alan Rison

    2012-08-01

    Full Text Available Introduction: Transient global amnesia is a syndrome of temporary and reversible disruption of short-term memory accompanied by repetitive questioning. Although the etiology is unknown, the prognosis usually benign, and no particular treatment is required, it is important for all involved clinicians to recognize the diagnosis and possess knowledge about the evaluation of these affected patients. Case Presentation: A middle-aged Caucasian woman presented for neurologic evaluation for acute forgetfulness. Neurologic examination disclosed repetitive questioning with preserved orientation and no focal motor, speech, sensory, coordination, or cranial nerve deficits. Neurologic investigations did not reveal any pathologic findings. Her memory improved and reverted to normal baseline over the course of a 24-hour hospital stay. Conclusion: Transient global amnesia is an interesting syndrome of reversible anterograde amnesia associated with repetitive questioning that occurs with an unclear etiology in middle-aged and elderly individuals. Due clinical diligence is required in the investigation of these patients. Treatment is generally not required, and the condition usually does not recur. Clinicians, including neurologists, internists, family practice physicians, and psychiatrists, need awareness of this condition.

  1. Transient compressible flows in porous media

    International Nuclear Information System (INIS)

    Morrison, F.A. Jr.

    1975-09-01

    Transient compressible flow in porous media was investigated analytically. The major portion of the investigation was directed toward improving and understanding of dispersion in these flows and developing rapid accurate numerical techniques for predicting the extent of dispersion. The results are of interest in the containment of underground nuclear experiments. The transient one-dimensional transport of a trace component in a gas flow is analyzed. A conservation equation accounting for the effects of convective transport, dispersive transport, and decay, is developed. This relation, as well as a relation governing the fluid flow, is used to predict trace component concentration as a function of position and time. A detailed analysis of transport associated with the isothermal flow of an ideal gas is done. Because the governing equations are nonlinear, numerical calculations are performed. The ideal gas flow is calculated using a highly stable implicit iterative procedure with an Eulerian mesh. In order to avoid problems of anomolous dispersion associated with finite difference calculation, trace component convection and dispersion are calculated using a Lagrangian mesh. Details of the Eulerian-Lagrangian numerical technique are presented. Computer codes have been developed and implemented on the Lawrence Livermore Laboratory computer system

  2. Transient Non-Newtonian Screw Flow

    Science.gov (United States)

    Ashrafi, Nariman

    2013-03-01

    The influence of axial flow on the transient response of the pseudoplastic rotating flow is carried out. The fluid is assumed to follow the Carreau-Bird model and mixed boundary conditions are imposed. The four-dimensional low-order dynamical system, resulted from Galerkin projection of the conservation of mass and momentum equations, includes additional nonlinear terms in the velocity components originated from the shear-dependent viscosity. In absence of axial flow the base flow loses its radial flow stability to the vortex structure at a lower critical Taylor number, as the pseudoplasticity increases. The emergence of the vortices corresponds to the onset of a supercritical bifurcation which is also seen in the flow of a linear fluid. However, unlike the Newtonian case, pseudoplastic Taylor vortices lose their stability as the Taylor number reaches a second critical number corresponding to the onset of a Hopf bifurcation. Existence of an axial flow, manifested by a pressure gradient appears to further advance each critical point on the bifurcation diagram. In addition to the simulation of spiral flow, the proposed formulation allows the axial flow to be independent of the main rotating flow. Complete transient flow field together with viscosity maps are also presented.

  3. Direct Numerical Simulations of Transient Dispersion

    Science.gov (United States)

    Porter, M.; Valdes-Parada, F.; Wood, B.

    2008-12-01

    Transient dispersion is important in many engineering applications, including transport in porous media. A common theoretical approach involves upscaling the micro-scale mass balance equations for convection- diffusion to macro-scale equations that contain effective medium quantities. However, there are a number of assumptions implicit in the various upscaling methods. For example, results obtained from volume averaging are often dependent on a given set of length and time scale constraints. Additionally, a number of the classical models for dispersion do not fully capture the early-time dispersive behavior of the solute for a general set of initial conditions. In this work, we present direct numerical simulations of micro-scale transient mass balance equations for convection-diffusion in both capillary tubes and porous media. Special attention is paid to analysis of the influence of a new time- decaying coefficient that filters the effects of the initial conditions. The direct numerical simulations were compared to results obtained from solving the closure problem associated with volume averaging. These comparisons provide a quantitative measure of the significance of (1) the assumptions implicit in the volume averaging method and (2) the importance of the early-time dispersive behavior of the solute due to various initial conditions.

  4. Asteroids in the High Cadence Transient Survey

    Science.gov (United States)

    Peña, J.; Fuentes, C.; Förster, F.; Maureira, J. C.; San Martín, J.; Littín, J.; Huijse, P.; Cabrera-Vives, G.; Estévez, P. A.; Galbany, L.; González-Gaitán, S.; Martínez, J.; de Jaeger, Th.; Hamuy, M.

    2018-03-01

    We report on the serendipitous observations of solar system objects imaged during the High cadence Transient Survey 2014 observation campaign. Data from this high-cadence wide-field survey was originally analyzed for finding variable static sources using machine learning to select the most-likely candidates. In this work, we search for moving transients consistent with solar system objects and derive their orbital parameters. We use a simple, custom motion detection algorithm to link trajectories and assume Keplerian motion to derive the asteroid’s orbital parameters. We use known asteroids from the Minor Planet Center database to assess the detection efficiency of the survey and our search algorithm. Trajectories have an average of nine detections spread over two days, and our fit yields typical errors of {σ }a∼ 0.07 {au}, σ e ∼ 0.07 and σ i ∼ 0.°5 in semimajor axis, eccentricity, and inclination, respectively, for known asteroids in our sample. We extract 7700 orbits from our trajectories, identifying 19 near-Earth objects, 6687 asteroids, 14 Centaurs, and 15 trans-Neptunian objects. This highlights the complementarity of supernova wide-field surveys for solar system research and the significance of machine learning to clean data of false detections. It is a good example of the data-driven science that Large Synoptic Survey Telescope will deliver.

  5. CUTIE: Cubesat Ultraviolet Transient Imaging Experiment

    Science.gov (United States)

    Cenko, Stephen B.; Bellm, Eric Christopher; Gal-Yam, Avishay; Gezari, Suvi; Gorjian, Varoujan; Jewell, April; Kruk, Jeffrey W.; Kulkarni, Shrinivas R.; Mushotzky, Richard; Nikzad, Shouleh; Piro, Anthony; Waxman, Eli; Ofek, Eran Oded

    2017-01-01

    We describe a mission concept for the Cubesat Ultraviolet Transient Imaging Experiment (CUTIE). CUTIE will image an area on the sky of ~ 1700 square degrees every ~ 95 min at near-UV wavelengths (260-320 nm) to a depth of 19.0 mag (AB). These capabilities represent orders of magnitude improvement over past UV imagers, allowing CUTIE to conduct the first true synoptic survey of the transient and variable sky in the UV bandpass. CUTIE will uniquely address key Decadal Survey science questions such as how massive stars end their lives, how super-massive black holes accrete material and influence their surroundings, and how suitable habitable-zone planets around low-mass stars are for hosting life. By partnering with upcoming ground-based time-domain surveys, CUTIE will further leverage its low-Earth orbit to provide a multi-wavelength view of the dynamic universe that can only be achieved from space. The remarkable sensitivity for such a small payload is achieved via the use of large format delta-doped CCDs; space qualifying this technology will serve as a key milestone towards the development of future large missions (Explorers and Surveyors). Finally, our innovative design in a 6U cubesat form factor will enable significant cost savings, accelerating the timeline from conception to on-sky operation (5 years; well matched for graduate student participation).

  6. Remarks on Muscle Contraction Mechanism II. Isometric Tension Transient and Isotonic Velocity Transient

    Directory of Open Access Journals (Sweden)

    Hiroyuki Ohshima

    2011-03-01

    Full Text Available Mitsui and Ohshima (2008 criticized the power-stroke model for muscle contraction and proposed a new model. In the new model, about 41% of the myosin heads are bound to actin filaments, and each bound head forms a complex MA3 with three actin molecules A1, A2 and A3 forming the crossbridge. The complex translates along the actin filament cooperating with each other. The new model well explained the experimental data on the steady filament sliding. As an extension of the study, the isometric tension transient and isotonic velocity transient are investigated. Statistical ensemble of crossbridges is introduced, and variation of the binding probability of myosin head to A1 is considered. When the binding probability to A1 is zero, the Hill-type force-velocity relation is resulted in. When the binding probability to A1 becomes finite, the deviation from the Hill-type force-velocity relation takes place, as observed by Edman (1988. The characteristics of the isometric tension transient observed by Ford, Huxley and Simmons (1977 and of the isotonic velocity transient observed by Civan and Podolsky (1966 are theoretically reproduced. Ratios of the extensibility are estimated as 0.22 for the crossbridge, 0.26 for the myosin filament and 0.52 for the actin filament, in consistency with the values determined by X-ray diffraction by Wakabayashi et al. (1994.

  7. Transient hyperphosphatemia: a benign laboratory disorder in a boy with Gitelman syndrome.

    Science.gov (United States)

    Skalova, Sylva; Kutilek, Stepan

    2016-01-01

    Transient hyperphosphatasemia of infancy and early childhood (THI) is characterized by transiently increased activity of serum alkaline phosphatase (S-ALP), predominantly its bone or liver isoform, in children under five years of age. There are no signs of metabolic bone disease or hepatopathy corresponding with the increased S-ALP. THI is benign disorder, rather laboratory than clinical disorder, which is usually accidentally detected in both healthy and sick children. When encountered in a child with either chronic bone, liver or kidney disease, it might concern the physician. We present a three year old boy with genetically confirmed Gitelman syndrome where THI was detected accidentally during periodic check-up. S-ALP peaked to 41.8 µkat/L, there were neither laboratory or clinical signs of liver or bone disease; the S-ALP dropped to normal value of 4 µkat/L 60 days later. Therefore, the patient fulfilled the criteria for THI. There were no further increases in S-ALP. Resumo A hiperfosfatasemia transitória benigna da infância (HTBI) é caracterizada por elevação transitória da atividade da fosfatase alcalina sérica (S-ALP), predominantemente em sua isoforma óssea ou hepática, em crianças com menos de cinco anos de idade. Não há sinais de patologia óssea metabólica ou hepatopatia correspondentes ao aumento da S-ALP. A HTBI é um distúrbio benigno, mais laboratorial que clínico, normalmente detectado acidentalmente em crianças saudáveis e acometidas por alguma patologia. Quando encontrada em crianças com doença crônica óssea, hepática ou renal, maiores preocupações são justificadas. O presente relato descreve o caso de um menino de três anos de idade com síndrome de Gitelman geneticamente confirmada, em que a HTBI foi detectada acidentalmente durante um exame periódico. A S-ALP atingiu o pico de 41,8 µkat/L, sem sinais laboratoriais ou clínicos de doença hepática ou óssea. O valor de S-ALP caiu para o nível normal de 4 µkat

  8. EM International. Volume 1

    Energy Technology Data Exchange (ETDEWEB)

    1993-07-01

    It is the intent of EM International to describe the Office of Environmental Restoration and Waste Management`s (EM`s) various roles and responsibilities within the international community. Cooperative agreements and programs, descriptions of projects and technologies, and synopses of visits to international sites are all highlighted in this semiannual journal. Focus on EM programs in this issue is on international collaboration in vitrification projects. Technology highlights covers: in situ sealing for contaminated sites; and remote sensors for toxic pollutants. Section on profiles of countries includes: Arctic contamination by the former Soviet Union, and EM activities with Germany--cooperative arrangements.

  9. Analytical Assessment for Transient Stability Under Stochastic Continuous Disturbances

    Energy Technology Data Exchange (ETDEWEB)

    Ju, Ping [Hohai Univ., Nanjing (China); Li, Hongyu [Hohai Univ., Nanjing (China); Gan, Chun [The Univ. of Tennessee, Knoxville, TN (United States); Liu, Yong [The Univ. of Tennessee, Knoxville, TN (United States); Yu, Yiping [Hohai Univ., Nanjing (China); Liu, Yilu [Univ. of Tennessee, Knoxville, TN (United States)

    2017-06-28

    Here, with the growing integration of renewable power generation, plug-in electric vehicles, and other sources of uncertainty, increasing stochastic continuous disturbances are brought to power systems. The impact of stochastic continuous disturbances on power system transient stability attracts significant attention. To address this problem, this paper proposes an analytical assessment method for transient stability of multi-machine power systems under stochastic continuous disturbances. In the proposed method, a probability measure of transient stability is presented and analytically solved by stochastic averaging. Compared with the conventional method (Monte Carlo simulation), the proposed method is many orders of magnitude faster, which makes it very attractive in practice when many plans for transient stability must be compared or when transient stability must be analyzed quickly. Also, it is found that the evolution of system energy over time is almost a simple diffusion process by the proposed method, which explains the impact mechanism of stochastic continuous disturbances on transient stability in theory.

  10. Transient hypothyroidism after 131I treatment of Graves disease

    International Nuclear Information System (INIS)

    Liu Jianfeng; Fang Yi; Zhang Xiuli; Ye Genyao; Xing Jialiu; Zhang Youren

    2003-01-01

    Objective: To evaluate the results of the transient hypothyroidism after 131 I treatment of Graves disease. Methods: A total of 32 transient hypothyroidism patients treated with 131 I for Graves disease were studied and followed up. Results: Transient hypothyroidism occurred within 2-6 months after 131 I treatment and 19 patients were symptomatic. At diagnosis of transient hypothyroidism, T 3 and T 4 levels were decreased had normal, TSH levels were increased, normal or low. Follow-up examination found that 20 patients were normal and 12 patients had relapse of hyperthyroidism. Conclusions: Therapy of Graves disease with low doses of 131 I causes a high incidence of transient hypothyroidism. After recovery of transient hypothyroidism, some patients have relapse of hyperthyroidism

  11. Mitochondrial cytochrome <em>B> sequence divergence among Spanish, Alpine and Abruzzo chamois (genus <em>Rupicapra>

    Directory of Open Access Journals (Sweden)

    Nadia Mucci

    1998-12-01

    Full Text Available Abstract We have studied genetic divergence and phylogenetic relationships of Alpine, Spanish and Abruzzo chamois (genus <em>Rupicapra> by sequencing a region of 330 nucleotides within the mitochondrial DNA cytochrome <em>b> gene (mtDNA cyt <em>b>. These sequences were aligned with additional homologous sequences of Caprinae: Japanese serow, Chinese goral, Canadian mountain goat, Mishmi takin, muskox, Sardinian mouflon and domestic goat. Results suggest that, using representatives of the Bovini as outgroups, the Caprinae constitute a monophyletic clade. However, inferred phylogenetic relationships among and within tribes of Caprinae were poorly defined and did not reflect current evolutionary and taxonomical views. In fact, the Asian Rupicaprini goral and serow constituted a strongly supported clade, which included the muskox, while the takin grouped with <em>Ovis>. Therefore, the monophyly of Ovibovini was not supported by cyt <em>b> sequences. Species of <em>Rupicapra> joined a strongly supported monophyletic clade, which was distantly related to the Asian rupicaprins and <em>Oreamnos>. Therefore, the monophyly of the Rupicaprini was not supported by these cyt <em>b> sequences. There were sister species relationships within <em>Rupicapra>, Spanish and Alpine chamois and the Abruzzo chamois (<em>Rupicapra pyrenaica ornataem> was strictly related to the Spanish chamois (<em>Rupicapra pyrenaica parvaem>, as previously suggested by allozyme data and biogeographic reconstructions.

  12. The enigma of transient splenial hyperintensity: In cryptococcal meningitis

    Directory of Open Access Journals (Sweden)

    Kaushik Sen

    2013-01-01

    Full Text Available Transient hyperintensity in splenium of corpus callosum is a relatively infrequent finding in MRI. Although it has been most consistently linked with frequent seizure episodes, many other possible causes have been proposed by different workers. Cryptococcal meningitis as a cause of transient splenial hyperintensity has never been reported till date. Here, we report a young girl who is congenitally immunodeficient and had suffered from cryptococcal meningitis with typical transient splenial hyperintense lesions in MRI.

  13. Classification of Transient Phenomena in Distribution System using wavelet Transform

    Science.gov (United States)

    Sedighi, Alireza

    2014-05-01

    An efficient procedure for classification of transient phenomena in distribution systems is proposed in this paper. The proposed method has been applied to classify some transient phenomena such as inrush current, load switching, capacitor switching and single phase to ground fault. The new scheme is based on wavelet transform algorithm. All of the events for feature extraction and test are simulated using Electro Magnetic Transient Program (EMTP). Results show high accuracy of proposed method.

  14. New Trifluoromethyl Triazolopyrimidines as Anti-<em>Plasmodium> <em>falciparum> Agents

    Directory of Open Access Journals (Sweden)

    Núbia Boechat

    2012-07-01

    Full Text Available According to the World Health Organization, half of the World’s population, approximately 3.3 billion people, is at risk for developing malaria. Nearly 700,000 deaths each year are associated with the disease. Control of the disease in humans still relies on chemotherapy. Drug resistance is a limiting factor, and the search for new drugs is important. We have designed and synthesized new 2-(trifluoromethyl[1,2,4]triazolo[1,5-<em>a>]pyrimidine derivatives based on bioisosteric replacement of functional groups on the anti-malarial compounds mefloquine and amodiaquine. This approach enabled us to investigate the impact of: (i ring bioisosteric replacement; (ii a CF3 group substituted at the 2-position of the [1,2,4]triazolo[1,5-<em>a>]pyrimidine scaffold and (iii a range of amines as substituents at the 7-position of the of heterocyclic ring; on <em>in vitroem> activity against <em>Plasmodium falciparumem>. According to docking simulations, the synthesized compounds are able to interact with <em>P. falciparumem> dihydroorotate dehydrogenase (<em>Pf>DHODH through strong hydrogen bonds. The presence of a trifluoromethyl group at the 2-position of the [1,2,4]triazolo[1,5-<em>a>]pyrimidine ring led to increased drug activity. Thirteen compounds were found to be active, with IC50 values ranging from 0.023 to 20 µM in the anti-HRP2 and hypoxanthine assays. The selectivity index (SI of the most active derivatives 5, 8, 11 and 16 was found to vary from 1,003 to 18,478.

  15. Novel Material Systems and Methodologies for Transient Thermal Management

    Data.gov (United States)

    National Aeronautics and Space Administration — Advancements in design and development of evaluation methodologies were made in transient thermal testing. Development of multifunctional and thermally switchable...

  16. Fast relaxation transients in a kicked damped oscillator

    Energy Technology Data Exchange (ETDEWEB)

    Urquizu, Merce [Laboratori d' Estudis Geofisics ' Eduard Fontsere' , IEC, Barcelona (Spain); Correig, Antoni M. [Departament d' Astronomical i Meteorologia, Laboratori d' Estudis Geofisics Eduard Fontsere, UB Marti Franques 1, E-08028 Barcelona (Spain) and Laboratori d' Estudis Geofisics ' Eduard Fontsere' , IEC, Barcelona (Spain)]. E-mail: ton.correig@am.ub.es

    2007-08-15

    Although nonlinear relaxation transients are very common in nature, very few studies are devoted to its characterization, mainly due to its short time duration. In this paper, we present a study about the nature of relaxation transients in a kicked damped oscillator, in which transients are generated in terms of continuous fast changes in the parameters of the system. We have found that transient dynamics can be described, rather than in terms of bifurcation dynamics, in terms of instantaneous stretching factors, which are related to the stability of fixed points of the corresponding stroboscopic maps.

  17. Boilup transients in a closed system

    International Nuclear Information System (INIS)

    Cho, D.H.; Lambert, G.A.; Chan, S.H.

    1983-01-01

    In analysis of certain hypothetical LMFBR accidents, it is often postulated that the core undergoes a gradual disruption leading to a boiling mixture of molten fuel and steel confined within the original core volume. The boilup behavior of such a fuel/steel mixture is an important consideration in assessing the potential for recriticalities. An experimental program is underway at ANL in order to provide a phenomenological understanding of the boilup behavior. The experiment is being conducted in a five-liter pressure vessel in which a pool of de-mineralized water is heated by volumetrically spaced electrical resistance heaters. This paper discusses the results of transient tests on pool boilup response to varying condensation rates at the upper boundary

  18. MODELLING OF NON-ROAD TRANSIENT CYCLE

    Directory of Open Access Journals (Sweden)

    Martin Kotus

    2013-12-01

    Full Text Available The paper describes the modeling of NRTC (Non-Road Transient Cycle test procedure based on previously measured characteristics of fuel consumption, carbon monoxide (CO, carbon dioxide (CO2, hydrocarbons (HC, nitrogen oxides (NOx and particulates (PM production. It makes possible to compare the current technical condition of an internal combustion engine of an agricultural tractor with its previous state or other tractor’s engine. Based on measured characteristics, it is also possible to model any other cycle without further measurements (NRSC test procedure, cycle for specific conditions – mountain tractor, etc.. The result may thus contribute to improving the environment by reducing the production of harmful substances emitted into the air and save money due to reduced fuel consumption.

  19. Transient digitizer for fast air shower events

    International Nuclear Information System (INIS)

    Wild, N.R.; Clay, R.W.

    1985-01-01

    Air shower structures are often measured on time scales of a few nanoseconds. Longitudinal disk structure near the core is of the order of meters in dimension, air Cerenkov pulses have full widths at half maximum of the order of tens of nanoseconds, and fast timing over typical arrays is usually measured to nanosecond accuracy. Oscilloscopes can be used but have very limited dynamic range and are expensive if measurements down to a few nanoseconds are to be made. For the fast Cerenkov work, an instrument with better dynamic range than an oscilloscope and with a time resolution sufficient to allow measurements limited only by system risetime of a few nanoseconds is needed. A 16/32 channel, 8 bit, fast transient digitizer was designed and built which runs at sample intervals down to approx. 1 nanosecond per channel

  20. Blind surveys for radio pulsars and transients

    International Nuclear Information System (INIS)

    Lorimer, D. R.

    2011-01-01

    The main reasons for searching for pulsars are to: (i) get an accurate census of the neutron star population and its origin and evolution; (ii) connect neutron stars to other stellar populations in the Galaxy and globular clusters; (iii) study Galactic astronomy (the interstellar medium and magnetic field); (iv) find and study new interesting individual objects; (v) study pulsar phenomenology; (vi) find pulsars to add to the sensitivity of pulsar timing arrays. This review focuses on blind (i.e. large area) searches for radio pulsars. I'll summarize the methods we use, some of the challenges they present, look at some of the recent and current efforts going on. I will also look at outreach of this area to groups outside the traditional area of pulsar research, highlight the discoveries of radio transients and look ahead to the future. Pulsars found at other wavelengths will be reviewed elsewhere in this volume.

  1. Transient optical gain in germanium quantum wells

    Energy Technology Data Exchange (ETDEWEB)

    Chatterjee, Sangam; Lange, Christoph; Koester, Niko S.; Schaefer, Martin; Kira, Mackillo; Koch, Stephan W. [Faculty of Physics and Materials Sciences Center, Philipps-Universitaet Marburg (Germany); Chrastina, Daniel; Isella, Giovanni; Kaenel, Hans von [CNISM, Como (Italy); L-NESS, Dipartimento di Fisica del Politecnico di Milano, Como (Italy); Sigg, Hans [Laboratory for Micro and Nanotecnology, Paul Scherrer Institut, Villigen PSI (Switzerland)

    2010-07-01

    One of today's most-sought goals in semiconductor technology is the monolithic integration of microelectronics and photonics on Si. Optical gain is, in general, not expected for Si and Ge or its alloys due to the indirect nature of the band gap in this material system. Here, we show that Ge/SiGe QWs show transient optical gain and may thus be used as an optically-pumped amplifier at room temperature. Further, the nonequilibrium effects which govern the relaxation dynamics of the optically injected carrier distributions in this material were observed and analyzed using a microscopic many-body theory. Strong non-equilibrium gain was obtained on a sub-100 fs time scale. Long-lived gain arising from {gamma}-point transitions is overcompensated by a process bearing the character of free carrier absorption.

  2. Cosmological perturbations in transient phantom inflation scenarios

    Energy Technology Data Exchange (ETDEWEB)

    Richarte, Martin G. [Universidade Federal do Parana, Departamento de Fisica, Caixa Postal 19044, Curitiba (Brazil); Universidad de Buenos Aires, Ciudad Universitaria 1428, Departamento de Fisica, Facultad de Ciencias Exactas y Naturales, Buenos Aires (Argentina); Kremer, Gilberto M. [Universidade Federal do Parana, Departamento de Fisica, Caixa Postal 19044, Curitiba (Brazil)

    2017-01-15

    We present a model of inflation where the inflaton is accommodated as a phantom field which exhibits an initial transient pole behavior and then decays into a quintessence field which is responsible for a radiation era. We must stress that the present unified model only deals with a single field and that the transition between the two eras is achieved in a smooth way, so the model does not suffer from the eternal inflation issue. We explore the conditions for the crossing of the phantom divide line within the inflationary era along with the structural stability of several critical points. We study the behavior of the phantom field within the slow-climb approximation along with the necessary conditions to have sufficient inflation. We also examine the model at the level of classical perturbations within the Newtonian gauge and determine the behavior of the gravitational potential, contrast density and perturbed field near the inflation stage and the subsequent radiation era. (orig.)

  3. Cosmological perturbations in transient phantom inflation scenarios

    International Nuclear Information System (INIS)

    Richarte, Martin G.; Kremer, Gilberto M.

    2017-01-01

    We present a model of inflation where the inflaton is accommodated as a phantom field which exhibits an initial transient pole behavior and then decays into a quintessence field which is responsible for a radiation era. We must stress that the present unified model only deals with a single field and that the transition between the two eras is achieved in a smooth way, so the model does not suffer from the eternal inflation issue. We explore the conditions for the crossing of the phantom divide line within the inflationary era along with the structural stability of several critical points. We study the behavior of the phantom field within the slow-climb approximation along with the necessary conditions to have sufficient inflation. We also examine the model at the level of classical perturbations within the Newtonian gauge and determine the behavior of the gravitational potential, contrast density and perturbed field near the inflation stage and the subsequent radiation era. (orig.)

  4. Prototype of a transient waveform recording ASIC

    Science.gov (United States)

    Qin, J.; Zhao, L.; Cheng, B.; Chen, H.; Guo, Y.; Liu, S.; An, Q.

    2018-01-01

    The paper presents the design and measurement results of a transient waveform recording ASIC based on the Switched Capacitor Array (SCA) architecture. This 0.18 μm CMOS prototype device contains two channels and each channel employs a SCA of 128 samples deep, a 12-bit Wilkinson ADC and a serial data readout. A series of tests have been conducted and the results indicate that: a full 1 V signal voltage range is available, the input analog bandwidth is approximately 450 MHz and the sampling speed is adjustable from 0.076 to 3.2 Gsps (Gigabit Samples Per Second). For precision waveform timing extraction, careful calibration of timing intervals between samples is conducted to improve the timing resolution of such chips, and the timing precision of this ASIC is proved to be better than 15 ps RMS.

  5. Delay time and tunneling transient phenomena

    International Nuclear Information System (INIS)

    Garcia-Calderon, Gaston; Villavicencio, Jorge

    2002-01-01

    Analytic solutions to the time-dependent Schroedinger equation for cutoff wave initial conditions are used to investigate the time evolution of the transmitted probability density for tunneling. For a broad range of values of the potential barrier opacity α, we find that the probability density exhibits two evolving structures. One refers to the propagation of a forerunner related to a time domain resonance [Phys. Rev. A 64, 0121907 (2001)], while the other consists of a semiclassical propagating wave front. We find a regime where the forerunners are absent, corresponding to positive time delays, and show that this regime is characterized by opacities α c . The critical opacity α c is derived from the analytical expression for the delay time, which reflects a link between transient effects in tunneling and the delay time

  6. Implications of Jeffreys-Lomnitz Transient Creep

    Science.gov (United States)

    Strick, Ellis

    1984-01-01

    In 1958 Jeffreys proposed a power law generalization of the logarithmic transient creep earlier attributed to Lomnitz. Although Jeffreys' power law form was admittedly defective in that it became unbounded at infinite time, he did apply it to the viscoelastic behavior of the earth-moon system. Since then it has been successfully applied by many investigators to mantle rehology and Chandler wobble. Experimental seismic studies indicate that most rock types exhibit the almost constant Q behavior which Lomnitz showed to be associated with his logarithmic creep. In this paper, we study not only the Q behavior related to Jeffreys' power law creep but also other mechanical properties such as a precise spring-dashpot ladder network realization are developed. In addition, a very simple physically realizable modification of this ladder network leads to a boundedness at long times of Jeffreys' creep in a manner which does not affect his successful application at finite times.

  7. Generation of intense transient magnetic fields

    International Nuclear Information System (INIS)

    Benjamin, R.F.

    1983-01-01

    In a laser system, the return current of a laser generated plasma is conducted near a target to subject that target to a magnetic field. The target may be either a small non-fusion object for testing under the magnetic field or a laser-fusion pellet. In the laser-fusion embodiment, the laser-fusion pellet is irradiated during the return current flow and the intense transient magnetic field is used to control the hot electrons thereof to hinder them from striking and heating the core of the irradiated laser-fusion pellet. An emitter, e.g. a microballoon of glass, metal or plastics, is subjected to a laser pulse to generate the plasma from which the return current flows into a wire cage or a coil and then to earth. (author)

  8. Topology optimization for transient heat transfer problems

    DEFF Research Database (Denmark)

    Zeidan, Said; Sigmund, Ole; Lazarov, Boyan Stefanov

    The focus of this work is on passive control of transient heat transfer problems using the topology optimization (TopOpt) method [1]. The goal is to find distributions of a limited amount of phase change material (PCM), within a given design domain, which optimizes the heat energy storage [2]. Our......-stepping scheme. A PCM can efficiently absorb heat while keeping its temperature nearly unchanged [8]. The use of PCM ine.g. electronics [9] and mechanics [10], yields improved performance and lower costs depending on a.o., the spatial distribution of PCM.The considered problem consists in optimizing...... the distribution of PCM in a design domain, subject to a periodic heat influx. The objective is to stabilize the heat outflow. Application examples include keeping constant room temperature for oscilatory heat input or keeping constant working temperature of a CPU subjected to time varying computational load....

  9. Lightning transient analysis in wind turbine blades

    DEFF Research Database (Denmark)

    Candela Garolera, Anna; Holbøll, Joachim; Madsen, Søren Find

    2013-01-01

    The transient behavior of lightning surges in the lightning protection system of wind turbine blades has been investigated in this paper. The study is based on PSCAD models consisting of electric equivalent circuits with lumped and distributed parameters involving different lightning current...... waveforms. The aim of the PSCAD simulations is to study the voltages induced by the lightning current in the blade that may cause internal arcing. With this purpose, the phenomenon of current reflections in the lightning down conductor of the blade and the electromagnetic coupling between the down conductor...... and other internal conductive elements of the blade is studied. Finally, several methods to prevent internal arcing are discussed in order to improve the lightning protection of the blade....

  10. Delayed Transient Post-Traumatic Quadriplegia

    Directory of Open Access Journals (Sweden)

    Khaloud Al-Shaaibi

    2015-03-01

    Full Text Available Transient neurological deficit following cervical trauma have been reported following sports injuries, and has been referred to as cervical cord neurapraxia. The so-called "whiplash injuries" following minor motor vehicle collisions usually do not produce any neurological deficit. Here we report the case of a whiplash type of injury presenting with a delayed onset neurological deficit, which was followed by rapid and complete recovery. The patient, an otherwise healthy 34-year-old male, attended the emergency department of Sultan Qaboos University Hospital following a rear-end motor vehicle collision. We present images showing degenerative disc disease causing spinal canal narrowing and mild cord compression in the patient, but no spinal instability. Differential diagnoses are also discussed.

  11. Primary system temperature limits and transient mitigation

    Energy Technology Data Exchange (ETDEWEB)

    Drucker, G.S.; Bost, D.S.

    1978-10-03

    Results of a study to determine the limiting temperature conditions in a large reactor system are presented. The study considers a sodium-cooled breeder reactor system having a loop-type primary system configuration. A temperature range of 930 to 1050/sup 0/F in reactor outlet temperature is covered. Significant findings were that the use of the materials for the 930/sup 0/F reference design, i.e., a core material of 20% cold-worked 316 stainless steel, a primary piping material of 316SS, and a steam generator material of unstabilized 2-1/4 Cr - 1 Mo resulted in limiting conditions in component performance at the higher temperatures. Means to circumvent these limits through the use of alternate materials, mitigation of thermal transients, and/or design changes are presented. The economic incentive to make some materials changes is also presented.

  12. Transient subdiffusion from an Ising environment

    Science.gov (United States)

    Muñoz-Gil, G.; Charalambous, C.; García-March, M. A.; Garcia-Parajo, M. F.; Manzo, C.; Lewenstein, M.; Celi, A.

    2017-11-01

    We introduce a model in which a particle performs a continuous-time random walk (CTRW) coupled to an environment with Ising dynamics. The particle shows locally varying diffusivity determined by the geometrical properties of the underlying Ising environment, that is, the diffusivity depends on the size of the connected area of spins pointing in the same direction. The model shows anomalous diffusion when the Ising environment is at critical temperature. We show that any finite scale introduced by a temperature different from the critical one, or a finite size of the environment, cause subdiffusion only during a transient time. The characteristic time, at which the system returns to normal diffusion after the subdiffusive plateau depends on the limiting scale and on how close the temperature is to criticality. The system also displays apparent ergodicity breaking at intermediate time, while ergodicity breaking at longer time occurs only under the idealized infinite environment at the critical temperature.

  13. Transient waveform recording utilizing TARGET7 ASIC

    Science.gov (United States)

    Zhang, J.; Liu, S.; Wang, Y.; Yang, C.; Zhu, X.; Feng, C.; An, Q.

    2017-04-01

    TARGET7, the 7th-generation TeV Array Readout with GSPS (Gigabit Samples Per Second) sampling and Experimental Trigger ASIC, has been initially designed to monolithically and inexpensively instrument large deployments of semiconductor photon detectors for large neutrino and muon detectors. It is a switched capacitor array (SCA) based transient waveform recorder with 3-dB bandwidth of 500 MHz; a large dynamic range of 1.8 V; high sampling rate (typically 1 GSPS); high channel density (16 channels per ASIC); low power consumption (0<1 mW/channel) and deep analog storage buffer (16,384 samples per channel). Moreover, each channel has an integrated Wilkinson ADC (Analog-to-Digital Convertor) for digitization. In this paper, a test board with the chip is described. Calibration methods, timing performance as well as its application possibility in charge measurement with a comparison to an oscilloscope are studied.

  14. Effect of transient heating loads on beryllium

    International Nuclear Information System (INIS)

    Kupriyanov, Igor B.; Porezanov, Nicolay P.; Nikolaev, Georgyi N.; Kurbatova, Liudmila A.; Podkovyrov, Vyacheslav L.; Muzichenko, Anatoliy D.; Zhitlukhin, Anatoliy M.; Khimchenko, Leonid N.; Gervash, Alexander A.

    2014-01-01

    Highlights: • We study the effect of transient plasma loads on beryllium erosion and surface microstructure. • Beryllium targets were irradiated by plasma streams with energy of 0.5–1 MJ/m 2 at ∼250 °C. • Under plasma loads 0.5–1 MJ/m 2 cracking of beryllium surface is rather slight. • Under 0.5 MJ/m 2 the mass loss of Be is no more than 0.2 g/m 2 shot and decreasing with shots number. • Under 1 MJ/m 2 maximum mass loss of beryllium was 3.7 g/m 2 shot and decreasing with shots number. - Abstract: Beryllium will be used as a plasma facing material for ITER first wall. It is expected that erosion of beryllium under transient plasma loads such as the edge-localized modes (ELMs) and disruptions will mainly determine a lifetime of ITER first wall. The results of recent experiments with the Russian beryllium of TGP-56FW ITER grade on QSPA-Be plasma gun facility are presented. The Be/CuCrZr mock-ups were exposed to upto 100 shots by deuterium plasma streams with pulse duration of 0.5 ms at ∼250 °C and average heat loads of 0.5 and 1 MJ/m 2 . Experiments were performed at 250 °C. The evolution of surface microstructure and cracks morphology as well as beryllium mass loss are investigated under erosion process

  15. Transient processing and characterization of advanced materials

    Science.gov (United States)

    Moussa, Sherif Omar Hassan

    The current study involves investigating the transient reactive processing of Ni3Al from nickel (Ni) and aluminum (Al) elemental metal powder during reaction synthesis (RS). The effect of incorporating ternary elements (interstitial) was also examined to produce boron-doped nickel-rich Ni3A1 with boron additions up to 2.0 wt %. Two transient reactive processes were studied; Reaction Pressing (RP) and a new process called Reaction Extrusion (RE) by which a near fully dense Ni3Al was simultaneously formed and shaped. These are seen as low-energy alternative to the hot processing of Ni3Al. Materials characterization was conducted using X-ray and Neutron diffraction, SEM/EDS, WDS, Image analysis and Archimedes principle. In the reactive sintering of B-doped Ni3Al, boron was found to rapidly dissolve during the reaction (leaving no residual boron) and occupy the grain boundaries as well as the Ni3Al superlattice (at boron content up to 0.3 wt %), in addition to combining with Ni and Al to form a complex boride (Ni41Al5B12) matrix above 0.5wt% content. Grain boundary strengthening, solid solution hardening and the formation of boride phase contributed to the observed increase in Rockwell hardness of Ni3Al with boron additions. The application of consolidation/deformation pressure was found to be most beneficial after the compact had reached the maximum combustion temperature and is cooling down. In the RP study, different consolidation pressures (100, 200 and 300 MPa) were applied to the reacted compact during cooling at different temperatures. It was found that with increasing pressing temperature and pressure, the percentage total porosity decreased reaching its minimum value of ˜1% at 1200°C and 300 MPa respectively. The grain size was almost independent of both pressing temperature and pressure. (Abstract shortened by UMI.)

  16. Robust transient dynamics and brain functions.

    Science.gov (United States)

    Rabinovich, Mikhail I; Varona, Pablo

    2011-01-01

    In the last few decades several concepts of dynamical systems theory (DST) have guided psychologists, cognitive scientists, and neuroscientists to rethink about sensory motor behavior and embodied cognition. A critical step in the progress of DST application to the brain (supported by modern methods of brain imaging and multi-electrode recording techniques) has been the transfer of its initial success in motor behavior to mental function, i.e., perception, emotion, and cognition. Open questions from research in genetics, ecology, brain sciences, etc., have changed DST itself and lead to the discovery of a new dynamical phenomenon, i.e., reproducible and robust transients that are at the same time sensitive to informational signals. The goal of this review is to describe a new mathematical framework - heteroclinic sequential dynamics - to understand self-organized activity in the brain that can explain certain aspects of robust itinerant behavior. Specifically, we discuss a hierarchy of coarse-grain models of mental dynamics in the form of kinetic equations of modes. These modes compete for resources at three levels: (i) within the same modality, (ii) among different modalities from the same family (like perception), and (iii) among modalities from different families (like emotion and cognition). The analysis of the conditions for robustness, i.e., the structural stability of transient (sequential) dynamics, give us the possibility to explain phenomena like the finite capacity of our sequential working memory - a vital cognitive function -, and to find specific dynamical signatures - different kinds of instabilities - of several brain functions and mental diseases.

  17. Robust transient dynamics and brain functions

    Directory of Open Access Journals (Sweden)

    Mikhail I Rabinovich

    2011-06-01

    Full Text Available In the last few decades several concepts of Dynamical Systems Theory (DST have guided psychologists, cognitive scientists, and neuroscientists to rethink about sensory motor behavior and embodied cognition. A critical step in the progress of DST application to the brain (supported by modern methods of brain imaging and multi-electrode recording techniques has been the transfer of its initial success in motor behavior to mental function, i.e., perception, emotion, and cognition. Open questions from research in genetics, ecology, brain sciences, etc. have changed DST itself and lead to the discovery of a new dynamical phenomenon, i.e., reproducible and robust transients that are at the same time sensitive to informational signals. The goal of this review is to describe a new mathematical framework -heteroclinic sequential dynamics- to understand self-organized activity in the brain that can explain certain aspects of robust itinerant behavior. Specifically, we discuss a hierarchy of coarse-grain models of mental dynamics in the form of kinetic equations of modes. These modes compete for resources at three levels: (i within the same modality, (ii among different modalities from the same family (like perception, and (iii among modalities from different families (like emotion and cognition. The analysis of the conditions for robustness, i.e., the structural stability of transient (sequential dynamics, give us the possibility to explain phenomena like the finite capacity of our sequential working memory -a vital cognitive function-, and to find specific dynamical signatures -different kinds of instabilities- of several brain functions and mental diseases.

  18. Impaired picture recognition in transient epileptic amnesia.

    Science.gov (United States)

    Dewar, Michaela; Hoefeijzers, Serge; Zeman, Adam; Butler, Christopher; Della Sala, Sergio

    2015-01-01

    Transient epileptic amnesia (TEA) is an epileptic syndrome characterized by recurrent, brief episodes of amnesia. Transient epileptic amnesia is often associated with the rapid decline in recall of new information over hours to days (accelerated long-term forgetting - 'ALF'). It remains unknown how recognition memory is affected in TEA over time. Here, we report a systematic study of picture recognition in patients with TEA over the course of one week. Sixteen patients with TEA and 16 matched controls were presented with 300 photos of everyday life scenes. Yes/no picture recognition was tested 5min, 2.5h, 7.5h, 24h, and 1week after picture presentation using a subset of target pictures as well as similar and different foils. Picture recognition was impaired in the patient group at all test times, including the 5-minute test, but it declined normally over the course of 1week. This impairment was associated predominantly with an increased false alarm rate, especially for similar foils. High performance on a control test indicates that this impairment was not associated with perceptual or discrimination deficits. Our findings suggest that, at least in some TEA patients with ALF in verbal recall, picture recognition does not decline more rapidly than in controls over 1week. However, our findings of an early picture recognition deficit suggest that new visual memories are impoverished after minutes in TEA. This could be the result of deficient encoding or impaired early consolidation. The early picture recognition deficit observed could reflect either the early stages of the process that leads to ALF or a separable deficit of anterograde memory in TEA. Lastly, our study suggests that at least some patients with TEA are prone to falsely recognizing new everyday visual information that they have not in fact seen previously. This deficit, alongside their ALF in free recall, likely affects everyday memory performance. Copyright © 2014 Elsevier Inc. All rights reserved.

  19. Genotoxicity of <em>Euphorbia hirtaem>: An <em>Allium cepaem> Assay

    Directory of Open Access Journals (Sweden)

    Kwan Yuet Ping

    2012-06-01

    Full Text Available The potential genotoxic effects of methanolic extracts of <em>Euphorbia hirta em>which is commonly used in traditional medicine to treat a variety of diseased conditions including asthma, coughs, diarrhea and dysentery was investigated using <em>Allium cepaem> assay. The extracts of 125, 250, 500 and 1,000 µg/mL were tested on root meristems of <em>A. cepaem>. Ethylmethanesulfonate was used as positive control and distilled water was used as negative control. The result showed that mitotic index decreased as the concentrations of <em>E. hirtaem> extract increased. A dose-dependent increase of chromosome aberrations was also observed. Abnormalities scored were stickiness, c-mitosis, bridges and vagrant chromosomes. Micronucleated cells were also observed at interphase. Result of this study confirmed that the methanol extracts of <em>E. hirta em>exerted significant genotoxic and mitodepressive effects at 1,000 µg/mL.

  20. Studies on an Electromagnetic Transient Model of Offshore Wind Turbines and Lightning Transient Overvoltage Considering Lightning Channel Wave Impedance

    Directory of Open Access Journals (Sweden)

    Li Zhang

    2017-12-01

    Full Text Available In recent years, with the rapid development of offshore wind turbines (WTs, the problem of lightning strikes has become more and more prominent. In order to reduce the failure rate caused by the transient overvoltage of lightning struck offshore WTs, the influencing factors and the response rules of transient overvoltage are analyzed. In this paper, a new integrated electromagnetic transient model of offshore WTs is established by using the numerical calculation method of the electromagnetic field first. Then, based on the lightning model and considering the impedance of the lightning channel, the transient overvoltage of lightning is analyzed. Last, the electromagnetic transient model of offshore WTs is simulated and analyzed by using the alternative transients program electro-magnetic transient program (ATP-EMTP software. The influence factors of lightning transient overvoltage are studied. The main influencing factors include the sea depth, the blade length, the tower height, the lightning flow parameters, the lightning strike point, and the blade rotation position. The simulation results show that the influencing factors mentioned above have different effects on the lightning transient overvoltage. The results of the study have some guiding significance for the design of the lightning protection of the engine room.

  1. Review of Transient Testing of Fast Reactor Fuels in the Transient REActor Test Facility (TREAT)

    Energy Technology Data Exchange (ETDEWEB)

    Jensen, C.; Wachs, D.; Carmack, J.; Woolstenhulme, N.

    2017-01-01

    The restart of the Transient REActor Test (TREAT) facility provides a unique opportunity to engage the fast reactor fuels community to reinitiate in-pile experimental safety studies. Historically, the TREAT facility played a critical role in characterizing the behavior of both metal and oxide fast reactor fuels under off-normal conditions, irradiating hundreds of fuel pins to support fast reactor fuel development programs. The resulting test data has provided validation for a multitude of fuel performance and severe accident analysis computer codes. This paper will provide a review of the historical database of TREAT experiments including experiment design, instrumentation, test objectives, and salient findings. Additionally, the paper will provide an introduction to the current and future experiment plans of the U.S. transient testing program at TREAT.

  2. Analysis of transient fuel failure mechanisms: selected ANL programs

    International Nuclear Information System (INIS)

    Deitrich, L.W.

    1975-01-01

    Analytical programs at Argonne National Laboratory related to fuel pin failure mechanisms in fast-reactor accident transients are described. The studies include transient fuel pin mechanics, mechanics of unclad fuel, and mechanical effects concerning potential fuel failure propagation. (U.S.).

  3. Static and Transient Cavitation Threshold Measurements for Mercury

    Energy Technology Data Exchange (ETDEWEB)

    Moraga, F.; Taleyarkhan, R.P.

    1999-11-14

    Transient and static cavitation thresholds for mercury as a function of the cover gas (helium or air), and pressure are reported. Both static and transient cavitation onset pressure thresholds increase linearly with cover gas pressure. Additionally, the cavitation thresholds as a function of dissolved gases were also measured and are reported.

  4. Effects of glycyrrhizin pre-treatment on transient ischemic brain ...

    African Journals Online (AJOL)

    Effects of glycyrrhizin pre-treatment on transient ischemic brain injury in mice. ... on transient ischemic brain injury in mice. Chiyeon Lim, Sehyun Lim, Young-Jun Lee, Bokcheul Kong, Byoungho Lee, Chang-Hyun Kim, Buyeo Kim, Suin Cho ... induced brain damage. Keywords: Glycyrrhizin, licorice, stroke, apoptosis ...

  5. Observing gravitational-wave transient GW150914 with minimal assumptions

    NARCIS (Netherlands)

    Abbott, B. P.; Abbott, R.; Abbott, T. D.; Abernathy, M. R.; Acernese, F.; Ackley, K.; Adams, C.; Phythian-Adams, A.T.; Addesso, P.; Adhikari, R. X.; Adya, V. B.; Affeldt, C.; Agathos, M.; Agatsuma, K.; Aggarwa, N.; Aguiar, O. D.; Aiello, L.; Ain, A.; Ajith, P.; Allen, B.; Allocca, A.; Altin, P. A.; Anderson, S. B.; Anderson, W. C.; Arai, K.; Araya, M. C.; Arceneaux, C. C.; Areeda, J. S.; Arnaud, N.; Arun, K. G.; Ascenzi, S.; Ashton, G.; Ast, M.; Aston, S. M.; Astone, P.; Aufmuth, P.; Aulbert, C.; Babak, S.; Bacon, P.; Bader, M. K. M.; Baker, P. T.; Baldaccini, F.; Ballardin, G.; Ballmer, S. W.; Barayoga, J. C.; Barclay, S. E.; Barish, B. C.; Barker, R.D.; Barone, F.; Barr, B.; Barsotti, L.; Barsuglia, M.; Barta, D.; Bartlett, J.; Bartos, I.; Bassiri, R.; Basti, A.; Batch, J. C.; Baune, C.; Bavigadda, V.; Bazzan, M.; Behnke, B.; Bejger, M.; Bell, A. S.; Bell, C. J.; Berger, B. K.; Bergman, J.; Bergmann, G.; Berry, C. P. L.; Bersanetti, D.; Bertolini, A.; Betzwieser, J.; Bhagwat, S.; Bhandare, R.; Bilenko, I. A.; Billingsley, G.; Birch, M.J.; Birney, R.; Biscans, S.; Bisht, A.; Bitossi, M.; Biwer, C.; Bizouard, M. A.; Blackburn, J. K.; Blackburn, L.; Blair, C. D.; Blair, D. G.; Blair, R. M.; Bloemen, A.L.S.; Bock, O.; Bodiya, T. P.; Boer, M.; Bogaert, J.G.; Bogan, C.; Bohe, A.; Bojtos, P.; Bond, T.C; Bondu, F.; Bonnand, R.; Boom, B. A.; Bork, R.; Boschi, V.; Bose, S.; Bouffanais, Y.; Bozzi, A.; Bradaschia, C.; Brady, P. R.; Braginsky, V. B.; Branchesi, M.; Brau, J. E.; Briant, T.; Brillet, A.; Brinkmann, M.; Brisson, V.; Brocki, P.; Brooks, A. F.; Brown, A.D.; Brown, D.; Brown, N. M.; Buchanan, C. C.; Buikema, A.; Bulik, T.; Bulten, H. J.; Buonanno, A.; Buskulic, D.; Buy, C.; Byer, R. L.; Cadonati, L.; Cagnoli, G.; Cahillane, C.; Calderon Bustillo, J.; Callister, T. A.; Calloni, E.; Camp, J. B.; Cannon, K. C.; Cao, J.; Capano, C. D.; Capocasa, E.; Carbognani, F.; Caride, S.; Diaz, J. Casanueva; Casentini, C.; Caudill, S.; Cavaglia, M.; Cavalier, F.; Cavalieri, R.; Cella, G.; Cepeda, C. B.; Baiardi, L. Cerboni; Cerretani, G.; Cesarini, E.; Chakraborty, R.; Chatterji, S.; Chalermsongsak, T.; Chamberlin, S. J.; Chan, M.; Chao, D. S.; Charlton, P.; Chassande-Mottin, E.; Chen, H. Y.; Chen, Y; Cheng, C.; Chincarini, A.; Chiummo, A.; Cho, H. S.; Cho, M.; Chow, J. H.; Christensen, N.; Chu, Qian; Chua, S. E.; Chung, E.S.; Ciani, G.; Clara, F.; Clark, J. A.; Clark, M.; Cleva, F.; Coccia, E.; Cohadon, P. -F.; Colla, A.; Collette, C. G.; Cominsky, L.; Constancio, M., Jr.; Conte, A.; Conti, L.; Cook, D.; Corbitt, T. R.; Cornish, N.; Corsi, A.; Cortese, S.; Costa, A.C.; Coughlin, M. W.; Coughlin, S. B.; Coulon, J. -P.; Countryman, S. T.; Couvares, P.; Cowan, E. E.; Coward, D. M.; Cowart, M. J.; Coyne, D. C.; Coyne, R.; Craig, K.; Creighton, J. D. E.; Cripe, J.; Crowder, S. G.; Cumming, A.; Cunningham, A.L.; Cuoco, E.; Dal Canton, T.; Danilishin, S. L.; D'Antonio, S.; Danzmann, K.; Darman, N. S.; Dattilo, V.; Dave, I.; Daveloza, H. P.; Davier, M.; Davies, G. S.; Daw, E. J.; Day, R.; Debra, D.; Debreczeni, G.; Degallaix, J.; De laurentis, M.; Deleglise, S.; Del Pozzo, W.; Denker, T.; Dent, T.; Dereli, H.; Dergachev, V.A.; DeRosa, R. T.; Rosa, R.; DeSalvo, R.; Dhurandhar, S.; Diaz, M. C.; Di Fiore, L.; Giovanni, M.G.; Di Lieto, A.; Di Pace, S.; Di Palma, I.; Di Virgilio, A.; Dojcinoski, G.; Dolique, V.; Donovan, F.; Dooley, K. L.; Doravari, S.; Douglas, R.; Downes, T. P.; Drago, M.; Drever, R. W. P.; Driggers, J. C.; Du, Z.; Ducrot, M.; Dwyer, S. E.; Edo, T. B.; Edwards, M. C.; Effler, A.; Eggenstein, H. -B.; Ehrens, P.; Eichholz, J.; Eikenberry, S. S.; Engels, W.; Essick, R. C.; Etzel, T.; Evans, T. M.; Evans, T. M.; Everett, R.; Factourovich, M.; Fafone, V.; Fair, H.; Fairhurst, S.; Fan, X.M.; Fang, Q.; Farinon, S.; Farr, B.; Farr, W. M.; Favata, M.; Fays, M.; Fehrmann, H.; Fejer, M. M.; Ferrante, I.; Ferreira, E. C.; Ferrini, F.; Fidecaro, F.; Fiori, I.; Fiorucci, D.; Fisher, R. R.; Flaminio, R.; Fletcher, M; Fournier, J. -D.; Franco, S; Frasca, S.; Frasconi, F.; Frei, Z.; Freise, A.; Frey, R.; Frey, V.; Fricke, T. T.; Fritsche, P.; Frolov, V. V.; Fulda, P.; Fyffe, M.; Gabbard, H. A. G.; Gair, J. R.; Gammaitoni, L.; Gaonkar, S. G.; Garufi, F.; Gatto, A.; Gaur, G.; Gehrels, N.; Gemme, G.; Gendre, B.; Genin, E.; Gennai, A.; George, J.; Gergely, L.; Germain, V.; Ghosh, Archisman; Ghosh, S.; Giaime, J. A.; Giardina, K. D.; Giazotto, A.; Gill, K.P.; Glaefke, A.; Goetz, E.; Goetz, R.; Gondan, L.; Gonzalez, Idelmis G.; Castro, J. M. Gonzalez; Gopakumar, A.; Gordon, N. A.; Gorodetsky, M. L.; Gossan, S. E.; Lee-Gosselin, M.; Gouaty, R.; Graef, C.; Graff, P. B.; Granata, M.; Grant, A.; Gras, S.; Gray, C.M.; Greco, G.; Green, A. C.; Groot, P.; Grote, H.; Grunewald, S.; Guidi, G. M.; Guo, X.; Gupta, A.; Gupta, M. K.; Gushwa, K. E.; Gustafson, E. K.; Gustafson, R.; de Haas, R.; Hacker, J. J.; Buffoni-Hall, R.; Hall, E. D.; Hammond, G.L.; Haney, M.; Hanke, M. M.; Hanks, J.; Hanna, C.; Hannam, M. D.; Hanson, P.J.; Hardwick, T.; Harms, J.; Harry, G. M.; Harry, I. W.; Hart, M. J.; Hartman, M. T.; Haster, C. -J.; Haughian, K.; Healy, J.; Heidmann, A.; Heintze, M. C.; Heitmann, H.; Hello, P.; Hemming, G.; Hendry, M.; Heng, I. S.; Hennig, J.; Heptonstall, A. W.; Heurs, M.; Hild, S.; Hinder, I.; Hoak, D.; Hodge, K. A.; Hofman, D.; Hollitt, S. E.; Holt, K.; Holz, D. E.; Hopkins, P.; Hosken, D. J.; Hough, J.; Houston, E. A.; Howell, E. J.; Hu, Y. M.; Huang, S.; Huerta, E. A.; Huet, D.; Hughey, B.; Husa, S.; Huttner, S. H.; Huynh-Dinh, T.; Idrisy, A.; Indik, N.; Ingram, D. R.; Inta, R.; Isa, H. N.; Isac, J. -M.; Isi, M.; Islas, G.; Isogai, T.; Iyer, B. R.; Izumi, K.; Jacqmin, T.; Jang, D.H.; Jani, K.; Jaranowski, P.; Jawahar, S.; Jimenez-Forteza, F.; Johnson, W.; Jones, I.D.; Jones, R.; Jonker, R. J. G.; Ju, L.; Haris, K.; Kalaghatgi, C. V.; Kalogera, V.; Kandhasamy, S.; Kang, G.H.; Kanner, J. B.; Karki, S.; Kasprzack, M.; Katsavounidis, E.; Katzman, W.; Kaufer, S.; Kaur, T.; Kawabe, K.; Kawazoe, F.; Kefelian, F.; Kehl, M. S.; Keitel, D.; Kelley, D. B.; Kells, W.; Kennedy, R.E.; Key, J. S.; Khalaidovski, A.; Khalili, F. Y.; Khan, I.; Khan., S.; Khan, Z.; Khazanov, E. A.; Kijhunchoo, N.; Kim, C.; Kim, J.; Kim, K.; Kim, Nam-Gyu; Kim, Namjun; Kim, Y.M.; King, E. J.; King, P. J.; Kinsey, M.; Kinzel, D. L.; Kissel, J. S.; Kleybolte, L.; Klimenko, S.; Koehlenbeck, S. M.; Kokeyama, K.; Koley, S.; Kondrashov, V.; Kontos, A.; Korobko, M.; Korth, W. Z.; Kowalska, I.; Kozak, D. B.; Kringel, V.; Krolak, A.; Krueger, C.; Kuehn, G.; Kumar, P.; Kuo, L.; Kutynia, A.; Lackey, B. D.; Laguna, P.; Landry, M.; Lange, J.; Lantz, B.; Lasky, P. D.; Lazzarini, A.; Lazzaro, C.; Leaci, R.; Leavey, S.; Lebigot, E. O.; Lee, C.H.; Lee, K.H.; Lee, M.H.; Lee, K.; Lenon, A.; Leonardi, M.; Leong, J. R.; Leroy, N.; Letendre, N.; Levin, Y.; Levine, B. M.; Li, T. G. F.; Libson, A.; Littenberg, T. B.; Lockerbie, N. A.; Logue, J.; Lombardi, A. L.; Lord, J. E.; Lorenzini, M.; Loriette, V.; Lormand, M.; Losurdo, G.; Lough, J. D.; Lueck, H.; Lundgren, A. P.; Luo, J.; Lynch, R.; Ma, Y.; MacDonald, T.T.; Machenschalk, B.; MacInnis, M.; Macleod, D. M.; Magana-Sandoval, F.; Magee, R. M.; Mageswaran, M.; Majorana, E.; Maksimovic, I.; Malvezzi, V.; Man, N.; Mandel, I.; Mandic, V.; Mangano, V.; Mansell, G. L.; Manske, M.; Mantovani, M.; Marchesoni, F.; Marion, F.; Marka, S.; Marka, Z.; Markosyan, A. S.; Maros, E.; Martelli, F.; Martellini, L.; Martin, I. W.; Martin, R.M.; Martynov, D. V.; Marx, J. N.; Mason, K.; Masserot, A.; Massinger, T. J.; Masso-Reid, M.; Matichard, F.; Matone, L.; Mavalvala, N.; Mazumder, N.; Mazzolo, G.; McCarthy, R.; McClelland, D. E.; McCormick, S.; McGuire, S. C.; McIntyre, G.; McIver, J.; McManus, D. J.; McWilliams, S. T.; Meacher, D.; Meadors, G. D.; Meidam, J.; Melatos, A.; Mende, G.; Mendoza-Gandara, D.; Mercer, R. A.; Merilh, E. L.; Merzougui, M.; Meshkov, S.; Messenger, C.; Messick, C.; Meyers, P. M.; Mezzani, F.; Miao, H.; Michel, C.; Middleton, H.; Mikhailov, E. E.; Milano, L.; Miller, J.; Millhouse, M.; Minenkov, Y.; Ming, J.; Mirshekari, S.; Mishra, C.; Mitra, S.; Mitrofanov, V. P.; Mitselmakher, G.; Mittleman, R.; Moggi, A.; Mohan, M.; Mohapatra, S. R. P.; Montani, M.; Moore, B.C.; Moore, J.C.; Moraru, D.; Gutierrez Moreno, M.; Morriss, S. R.; Mossavi, K.; Mours, B.; Mow-Lowry, C. M.; Mueller, C. L.; Mueller, G.; Muir, A. W.; Mukherjee, Arunava; Mukherjee, S.D.; Mukherjee, S.; Mukund, N.; Mullavey, A.; Munch, J.; Murphy, D. J.; Murray, P.G.; Mytidis, A.; Nardecchia, I.; Naticchioni, L.; Nayak, R. K.; Necula, V.; Nedkova, K.; Nelemans, G.; Gutierrez-Neri, M.; Neunzert, A.; Newton-Howes, G.; Nguyen, T. T.; Nielsen, A. B.; Nissanke, S.; Nitz, A.; Nocera, F.; Nolting, D.; Normandin, M. E. N.; Nuttall, L. K.; Oberling, J.; Ochsner, E.; O'Dell, J.; Oelker, E.; Ogin, G. H.; Oh, J.; Oh, S. H.; Ohme, F.; Oliver, M. B.; Oppermann, P.; Oram, Richard J.; O'Reilly, B.; O'Shaughnessy, R.; Ottaway, D. J.; Ottens, R. S.; Overmier, H.; Owen, B. J.; Pai, A.; Pai, S. A.; Palamos, J. R.; Palashov, O.; Palomba, C.; Pal-Singh, A.; Pan, H.; Pankow, C.; Pannarale, F.; Pant, B. C.; Paoletti, F.; Paoli, A.; Papa, M. A.; Page, J.; Paris, H. R.; Parker, W.S; Pascucci, D.; Pasqualetti, A.; Passaquieti, R.; Passuello, D.; Patricelli, B.; Patrick, Z.; Pearlstone, B. L.; Pedraza, M.; Pedurand, R.; Pekowsky, L.; Pele, A.; Penn, S.; Perreca, A.; Phelps, M.; Piccinni, O. J.; Pichot, M.; Piergiovanni, F.; Pierro, V.; Pillant, G.; Pinard, L.; Pinto, I. M.; Pitkin, M.; Poggiani, R.; Popolizio, P.; Post, A.; Powell, J.; Prasad, J.; Predoi, V.; Premachandra, S. S.; Prestegard, T.; Price, L. R.; Prijatelj, M.; Principe, M.; Privitera, S.; Prodi, G. A.; Prolchorov, L.; Puncken, O.; Punturo, M.; Puppo, P.; Puerrer, M.; Qi, H.; Qin, J.; Quetschke, V.; Quintero, E. A.; Quitzow-James, R.; Raab, F. J.; Rabeling, D. S.; Radkins, H.; Raffai, P.; Raja, S.; Rakhmanov, M.; Rapagnani, P.; Raymond, V.; Razzano, M.; Re, V.; Read, J.; Reed, C. M.; Regimbau, T.; Rei, L.; Reid, S.; Reitze, D. H.; Rew, H.; Reyes, S. D.; Ricci, F.; Riles, K.; Robertson, N. A.; Robie, R.; Robinet, F.; Rocchi, A.; Rolland, L.; Rollins, J. G.; Roma, V. J.; Romano, R.; Romanov, G.; Romie, J. H.; Rosinska, D.; Rowan, S.; Ruediger, A.; Ruggi, P.; Ryan, K.A.; Sachdev, P.S.; Sadecki, T.; Sadeghian, L.; Salconi, L.; Saleem, M.; Salemi, F.; Samajdar, A.; Sammut, L.; Sanchez, E. J.; Sandberg, V.; Sandeen, B.; Sanders, J. R.; Sassolas, B.; Sathyaprakash, B. S.; Saulson, P. R.; Sauter, O.; Savage, R. L.; Sawadsky, A.; Schale, P.; Schilling, R.; Schmidt, J; Schmidt, P.; Schnabel, R.B.; Schofield, R. M. S.; Schoenbeck, A.; Schreiber, K.E.C.; Schuette, D.; Schutz, B. F.; Scott, J.; Scott, M.S.; Sellers, D.; Sengupta, A. S.; Sentenac, D.; Sequino, V.; Sergeev, A.; Serna, G.; Setyawati, Y.; Sevigny, A.; Shaddock, D. A.; Shah, S.; Shithriar, M. S.; Shaltev, M.; Shao, Z.M.; Shapiro, B.; Shawhan, P.; Sheperd, A.; Shoemaker, D. H.; Shoemaker, D. M.; Siellez, K.; Siemens, X.; Sigg, D.; Silva, António Dias da; Simakov, D.; Singer, A; Singer, L. P.; Singh, A.; Singh, R.; Singhal, A.; Sintes, A. M.; Slagmolen, B. J. J.; Smith, R. J. E.; Smith, N.D.; Smith, R. J. E.; Son, E. J.; Sorazu, B.; Sorrentino, F.; Souradeep, T.; Srivastava, A. K.; Staley, A.; Steinke, M.; Steinlechner, J.; Steinlechner, S.; Steinmeyer, D.; Stephens, B. C.; Stone, J.R.; Strain, K. A.; Straniero, N.; Stratta, G.; Strauss, N. A.; Strigin, S. E.; Sturani, R.; Stuver, A. L.; Summerscales, T. Z.; Sun, L.; Sutton, P. J.; Swinkels, B. L.; Szczepanczyk, M. J.; Tacca, M.D.; Talukder, D.; Tanner, D. B.; Tapai, M.; Tarabrin, S. P.; Taracchini, A.; Taylor, W.R.; Theeg, T.; Thirugnanasambandam, M. P.; Thomas, E. G.; Thomas, M.; Thomas, P.; Thorne, K. A.; Thorne, K. S.; Thrane, E.; Tiwari, S.; Tiwari, V.; Tokmakov, K. V.; Tomlinson, C.; Tonelli, M.; Torres, C. V.; Torrie, C. I.; Toyra, D.; Travasso, F.; Traylor, G.; Trifiro, D.; Tringali, M. C.; Trozzo, L.; Tse, M.; Turconi, M.; Tuyenbayev, D.; Ugolini, D.; Unnikrishnan, C. S.; Urban, A. L.; Usman, S. A.; Vahlhruch, H.; Vajente, G.; Valdes, G.; Van Bakel, N.; Van Beuzekom, Martin; Van den Brand, J. F. J.; Van Den Broeck, C.F.F.; Vander-Hyde, D. C.; van der Schaaf, L.; van Heijningen, J. V.; van Veggel, A. A.; Vardaro, M.; Vass, S.; Vasuth, M.; Vaulin, R.; Vecchio, A.; Vedovato, G.; Veitch, J.; Veitch, R. J.; Venkateswara, K.; Verkindt, D.; Vetrano, F.; Vicere, A.; Vinciguerra, S.; Vine, D. J.; Vinet, J. -Y.; Vitale, S.; Vo, T.; Vocca, H.; Vorvick, C.; Voss, D. V.; Vousden, W. D.; Vyatchanin, S. P.; Wade, A. R.; Wade, L. E.; Wade, MT; Walker, M.; Wallace, L.; Walsh, S.; Wang, G.; Wang, H.; Wang, M.; Wang, X.; Wang, Y.; Ward, R. L.; Warner, J.; Was, M.; Weaver, B.; Wei, L. -W.; Weinert, M.; Weinstein, A. J.; Weiss, R.; Welborn, T.; Wen, L.M.; Wessels, P.; Westphal, T.; Wette, K.; Whelan, J. T.; White, D. J.; Whiting, B. F.; Williams, D.; Williams, D.R.; Williamson, A. R.; Willis, J. L.; Willke, B.; Wimmer, M. H.; Winkler, W.; Wipf, C. C.; Wittel, H.; Woan, G.; Worden, J.; Wright, J.L.; Wu, G.; Yablon, J.; Yam, W.; Yamamoto, H.; Yancey, C. C.; Yap, M. J.; Yu, H.; Yvert, M.; Zadrozny, A.; Zangrando, L.; Zanolin, M.; Zendri, J. -P.; Zevin, M.; Zhang, F.; Zhang, L.; Zhang, M.; Zhang, Y.; Zhao, C.; Zhou, M.; Zhou, Z.; Zhu, X. J.; Zucker, M. E.; Zuraw, S. E.; Zweizig, J.

    2016-01-01

    The gravitational-wave signal GW150914 was first identified on September 14, 2015, by searches for short-duration gravitational-wave transients. These searches identify time-correlated transients in multiple detectors with minimal assumptions about the signal morphology, allowing them to be

  6. Sequencing of Escherichia coli that cause persistent and transient Mastitis

    Science.gov (United States)

    The genomes of two strains of Escherichia coli that cause bovine mastitis were sequenced. These strains are known to be associated with persistent and transient mastitis: strain ECA-B causes a transient infection, and ECC-M leads to a persistent infection....

  7. The Relevance of the Dynamic Stall Effect for Transient

    DEFF Research Database (Denmark)

    Jauch, Clemens; Sørensen, Poul; Bak-Jensen, Birgitte

    2005-01-01

    This article describes a methodology to quantify the influence of dynamic stall on transient fault operations of active-stall turbines. The model of the dynamic stall effect is introduced briefly. The behaviour of the dynamic stall model during a transient fault operation is described mathematica...

  8. Transient Astronomy with SKA and its Precursors Abstract 1 ...

    Indian Academy of Sciences (India)

    40

    ing radio sky (msec-sec; Carilli, 2014). Transients in radio bands are mainly dominated by three kinds of emission mechanisms: 1:) Incoherent synchrotron emission: Transients with incoherent emission show relatively slow vari- ability, and are limited by brightness temperature. These events are mainly associated with ...

  9. 17 CFR 270.3a-2 - Transient investment companies.

    Science.gov (United States)

    2010-04-01

    ... 17 Commodity and Securities Exchanges 3 2010-04-01 2010-04-01 false Transient investment companies... (CONTINUED) RULES AND REGULATIONS, INVESTMENT COMPANY ACT OF 1940 § 270.3a-2 Transient investment companies... which an issuer owns or proposes to acquire investment securities (as defined in section 3(a) of the Act...

  10. Steady State and Transient Analysis of Induction Motor Driving a ...

    African Journals Online (AJOL)

    The importance of using a digital computer in studying the performance of Induction machine under steady and transient states is presented with computer results which show the transient behaviour of 3-phase machine during balanced and unbalanced conditions. The computer simulation for these operating conditions is ...

  11. Transient hydraulics and heat transfer in a turbulent flow

    International Nuclear Information System (INIS)

    Kawamura, H.

    1975-06-01

    In a reactor transient analysis, the friction factor and the heat transfer coefficient are assumed equal to the steady state values even in a transient state. This quasi-static assumption has been examined in the present paper. (orig./TK) [de

  12. Laser-Induced Breakdown Spectroscopy and Chlorophyll a Flourescence Transients

    DEFF Research Database (Denmark)

    Frydenvang, Jens

    of a sufficient quality; something that remains a problem for many in-situ methods. In my PhD, I present my work with two such in-situ methods, Laser-Induced Breakdown Spectroscopy (LIBS) and OJIP transients, the rising part of chlorophyll a fluorescence transients from dark-adapted leaves....

  13. Language, Policy and Power in a Transient Multilingual Workplace

    DEFF Research Database (Denmark)

    Lønsmann, Dorte; Mortensen, Janus

    borders. In this paper we invoke the concept of ‘transient multilingual communities’ to capture the characteristics of such workplaces. In transient multilingual communities norms for language choice are less stable and more negotiable than in other settings. This entails continuous negotiation of norms...

  14. Exploring the transient sky: From surveys to simulations

    NARCIS (Netherlands)

    Carbone, D.

    2016-01-01

    In this thesis I investigated transient sources, their detectability, and their rate. I validated and integrated the source finder software used within the LOFAR Transients Pipeline. This is a key component of the pipeline as it extracts sources from images and measures their fluxes and locations. I

  15. Coupled equations for transient water flow, heat flow, and ...

    Indian Academy of Sciences (India)

    presented on coupled equations from a perspective of energy optimization. 1. Introduction. Given an appropriate time scale, all earth systems are transient. The evolution of the earth's crust ... tem, in combination with transient heat flow and three-dimensional deformation. .... hydraulic capacity by analogy with heat capacity.

  16. Thermophysical Analysis of Rocks by Transient Methods

    Science.gov (United States)

    Kubicar, Ludovit; Vretenar, Viliam; Bohac, Vlastimil; Stofanik, Vladimir; Dieska, Peter

    2010-05-01

    Rocks belong to porous materials where content of pore significantly influence its thermophysical properties. Porous structure plays an important role in heat and fluid transport. A set of effects can be found in such structures like freezing, thawing, evaporation, etc. Highly innovative testing technique based on transient methods has been used for thermophysical analysis in which the specific heat, thermal diffusivity and thermal conductivity is determined, anomalies of the thermophysical parameters connected with freezing and thawing of water in pores are measured, propagation of freezing and thawing fronts are detected and diffusion of moisture in pore structure is monitored on sandstone and Gioia marble. Pulse transient method is based on generation of a heat disturbance by plane heat source fixed in the sample. Specific heat, thermal diffusivity and thermal conductivity are determined from the parameters of the temperature response to this heat disturbance. A heat source in the step-wise heating regime was applied to the frozen sample to study basic characteristics of the propagation of thawing front. In both experiments a sample is used that consists of three parts of size 50x50x10 mm assembled in a rectangle 50x50x30 mm where in first contact of the specimen parts a plane of heat source and in the second one a thermometer is fixed. The sample has to be conditioned prior the measurement to obtain the required thermodynamic state, i.e. the initial temperature and moisture stage. An appropriate heating and cooling regime allows measuring the anomalies of specific heat, thermal conductivity and thermal diffusivity connected with freezing and thawing. The hot ball transient method for measuring thermal conductivity is used for monitoring the moisture diffusion. Principle of the hot ball method is based on generation of the heat in a step-wise regime by a sensor in a form of small ball in diameter of 2 mm that, in addition, it monitors its temperature. A

  17. Interface Evolution During Transient Pressure Solution Creep

    Science.gov (United States)

    Dysthe, D. K.; Podladchikov, Y. Y.; Renard, F.; Jamtveit, B.; Feder, J.

    When aggregates of small grains are pressed together in the presence of small amounts of solvent the aggregate compacts and the grains tend to stick together. This hap- pens to salt and sugar in humid air, and to sediments when buried in the Earths crust. Stress concentration at the grain contacts cause local dissolution, diffusion of the dissolved material out of the interface and deposition on the less stressed faces of the grains{1}. This process, in geology known as pressure solution, plays a cen- tral role during compaction of sedimentary basins{1,2}, during tectonic deformation of the Earth's crust{3}, and in strengthening of active fault gouges following earth- quakes{4,5}. Experimental data on pressure solution has so far not been sufficiently accurate to understand the transient processes at the grain scale. Here we present ex- perimental evidence that pressure solution creep does not establish a steady state inter- face microstructure as previously thought. Conversely, cumulative creep strain and the characteristic size of interface microstructures grow as the cubic root of time. A sim- ilar transient phenomenon is known in metallurgy (Andrade creep) and is explained here using an analogy with spinodal dewetting. 1 Weyl, P. K., Pressure solution and the force of crystallization - a phenomenological theory. J. Geophys. Res., 64, 2001-2025 (1959). 2 Heald, M. T., Cementation of Simpson and St. Peter Sandstones in parts of Okla- homa, Arkansas and Missouri, J. Geol. Chicago, 14, 16-30 (1956). 3 Schwartz, S., Stöckert, B., Pressure solution in siliciclastic HP-LT metamorphic rocks constraints on the state of stress in deep levels of accretionary complexes. Tectonophysics, 255, 203-209 (1996). 4 Renard, F., Gratier, J.P., Jamtveit, B., Kinetics of crack-sealing, intergranular pres- sure solution, and compaction around active faults. J. Struct. Geol., 22, 1395-1407, (2000). 5 Miller, S. A., BenZion, Y., Burg, J. P.,A three-dimensional fluid-controlled earth

  18. EVENT, Explosive Transients in Flow Networks

    International Nuclear Information System (INIS)

    Andrae, R.W.; Tang, P.K.; Bolstad, J.W.; Gregory, W.S.

    1985-01-01

    1 - Description of problem or function: A major concern of the chemical, nuclear, and mining industries is the occurrence of an explosion in one part of a facility and subsequent transmission of explosive effects through the ventilation system. An explosive event can cause performance degradation of the ventilation system or even structural failures. A more serious consequence is the release of hazardous materials to the environment if vital protective devices such as air filters, are damaged. EVENT was developed to investigate the effects of explosive transients through fluid-flow networks. Using the principles of fluid mechanics and thermodynamics, governing equations for the conservation of mass, energy, and momentum are formulated. These equations are applied to the complete network subdivided into two general components: nodes and branches. The nodes represent boundaries and internal junctions where the conservation of mass and energy applies. The branches can be ducts, valves, blowers, or filters. Since in EVENT the effect of the explosion, not the characteristics of the explosion itself, is of interest, the transient is simulated in the simplest possible way. A rapid addition of mass and energy to the system at certain locations is used. This representation is adequate for all of the network except the region where the explosion actually occurs. EVENT84 is a modification of EVENT which includes a new explosion chamber model subroutine based on the NOL BLAST program developed at the Naval Ordnance Laboratory, Silver Spring, Maryland. This subroutine calculates the confined explosion near-field parameters and supplies the time functions of energy and mass injection. Solid-phase or TNT-equivalent explosions (which simulate 'point source' explosions in nuclear facilities) as well as explosions in gas-air mixtures can be simulated. The four types of explosions EVENT84 simulates are TNT, hydrogen in air, acetylene in air, and tributyl phosphate (TBP or 'red oil

  19. An IBC enhanced DGTD scheme for transient analysis of em interactions with graphene

    KAUST Repository

    Li, Ping

    2014-07-01

    A discontinuous Galerkin time-domain (DGTD) method is proposed for analyzing electromagnetic field interactions on graphene from microwave to terahertz frequencies. An impedance boundary condition (IBC) is utilized to model the graphene within the DGTD framework. The numerical flux is reformulated to take into account the IBC. Highly dispersive surface conductivity of graphene present in the resulting flux expression is approximated in terms of rational functions using the fast-relaxation vector-fitting technique. Via inverse Laplace transform, this facilitates the time domain matrix equations into an integral form for time variable t, finite integral technique (FIT) with recursive convolution method is employed to discrete and solve the matrix equations. The accuracy and applicability of the proposed IBC-DGTD is verified by numerical experiments.

  20. Local mapping of interface traps using contactless capacitance transient technique

    Science.gov (United States)

    Yoshida, Haruhiko; Mori, Hidenobu

    2016-10-01

    Contactless capacitance transient techniques have been applied to local mapping of interface traps of a semiconductor wafer. In contactless capacitance transient techniques, a Metal-Air gap-Oxide-Semiconductor (MAOS) structure is used instead of a conventional Metal-Oxide-Semiconductor (MOS) structure. The local mapping of interface traps was obtained by using a contactless Isothermal Capacitance Transient Spectroscopy (ICTS), which is one of the contactless capacitance transient techniques. The validity of the contactless ICTS was demonstrated by characterizing a partially Au-doped Si wafer. The results revealed that local mapping of interface traps using contactless capacitance transient techniques is effective in wafer inspection and is a promising technique for the development of MOS devices and solar cells with high reliability and high performance.

  1. Accelerating transient drainage from UMTRA Project tailings piles

    International Nuclear Information System (INIS)

    1990-09-01

    The period between the completion of construction of the tailings disposal cell and the establishment of equilibrium moisture content and seepage conditions is considered to be the period of transient drainage. Transient drainage may be due to factors such as construction water, precipitation, or residual water from the milling process. Transient seepage rates usually exceed steady state seepage rates. If the transient seepage rate causes contaminant levels to exceed groundwater compliance standards, then an alternative groundwater compliance strategy or technical approach to reduce or mitigate the effects of the drainage must be adopted. This study examines methods to accelerate the transient drainage of soils and hence to remove excess pore water from tailings in UMTRA Project disposal cells. The technical and economic feasibility of possible methods is examined. In order to perform comparative economical analyses of the various methods, an example tailings pile is postulated. This pile is considered to be 300 meters by 300 meters by 10 meters in thickness

  2. Emergency Medical Service (EMS) Stations

    Data.gov (United States)

    Kansas Data Access and Support Center — EMS Locations in Kansas The EMS stations dataset consists of any location where emergency medical services (EMS) personnel are stationed or based out of, or where...

  3. A Catalog of Coronal "EIT Wave" Transients

    Science.gov (United States)

    Thompson, B. J.; Myers, D. C.

    2009-01-01

    Solar and Heliospheric Observatory (SOHO) Extreme ultraviolet Imaging Telescope (EIT) data have been visually searched for coronal "EIT wave" transients over the period beginning from 1997 March 24 and extending through 1998 June 24. The dates covered start at the beginning of regular high-cadence (more than one image every 20 minutes) observations, ending at the four-month interruption of SOHO observations in mid-1998. One hundred and seventy six events are included in this catalog. The observations range from "candidate" events, which were either weak or had insufficient data coverage, to events which were well defined and were clearly distinguishable in the data. Included in the catalog are times of the EIT images in which the events are observed, diagrams indicating the observed locations of the wave fronts and associated active regions, and the speeds of the wave fronts. The measured speeds of the wave fronts varied from less than 50 to over 700 km s(exp -1) with "typical" speeds of 200-400 km s(exp -1).

  4. Transient evoked otoacoustic emissions in rock musicians.

    Science.gov (United States)

    Høydal, Erik Harry; Lein Størmer, Carl Christian; Laukli, Einar; Stenklev, Niels Christian

    2017-09-01

    Our focus in this study was the assessment of transient evoked otoacoustic emissions (TEOAEs) in a large group of rock musicians. A further objective was to analyse tinnitus among rock musicians as related to TEOAEs. The study was a cross-sectional survey of rock musicians selected at random. A control group was included at random for comparison. We recruited 111 musicians and a control group of 40 non-musicians. Testing was conducted by using clinical examination, pure tone audiometry, TEOAEs and a questionnaire. TEOAE SNR in the half-octave frequency band centred on 4 kHz was significantly lower bilaterally in musicians than controls. This effect was strongly predicted by age and pure-tone hearing threshold levels in the 3-6 kHz range. Bilateral hearing thresholds were significantly higher at 6 kHz in musicians. Twenty percent of the musicians had permanent tinnitus. There was no association between the TEOAE parameters and permanent tinnitus. Our results suggest an incipient hearing loss at 6 kHz in rock musicians. Loss of TEOAE SNR in the 4 kHz half-octave frequency band was observed, but it was related to higher mean 3-6 kHz hearing thresholds and age. A large proportion of rock musicians have permanent tinnitus.

  5. PoET: Polarimeters for Energetic Transients

    Science.gov (United States)

    McConnell, Mark; Barthelmy, Scott; Hill, Joanne

    2008-01-01

    This presentation focuses on PoET (Polarimeters for Energetic Transients): a Small Explorer mission concept proposed to NASA in January 2008. The principal scientific goal of POET is to measure GRB polarization between 2 and 500 keV. The payload consists of two wide FoV instruments: a Low Energy Polarimeter (LEP) capable of polarization measurements in the energy range from 2-15 keV and a high energy polarimeter (Gamma-Ray Polarimeter Experiment - GRAPE) that will measure polarization in the 60-500 keV energy range. Spectra will be measured from 2 keV up to 1 MeV. The PoET spacecraft provides a zenith-pointed platform for maximizing the exposure to deep space. Spacecraft rotation will provide a means of effectively dealing with systematics in the polarization response. PoET will provide sufficient sensitivity and sky coverage to measure statistically significant polarization for up to 100 GRBs in a two-year mission. Polarization data will also be obtained for solar flares, pulsars and other sources of astronomical interest.

  6. Nonlinear transient wave propagation in homgeneous plasmas

    International Nuclear Information System (INIS)

    Thomsen, K.

    1983-01-01

    The transient phenomena associated with the propagation of nonlinear high frequency waves in homogeneous and isotropic or anisotropic plasma are considered. The basic equation for the different wave types included in this analysis are derived by using a two-fluid description of the plasma. Before discussing the importance of different nonlinearities the main results from a linear treatment are given. Generation of harmonic and local changes in the plasma frequency caused by ponderomotive forces are the nonlinear phenomena which are included in the nonlinear treatment. Generation of harmonics is only important for extraordinary waves and this case is discussed in detail. The density perturbations are described either as forced non-dispersive or as forced dispersive low frequency electrostatic waves. The differences between these two descriptions are first considered analytically then by a numerical analysis of the problem with the influence of the density variations on the propagation of the high frequency wave included. A one-dimensional description is used in all cases. (Auth.)

  7. The Zwicky Transient Facility Galactic Plane Survey

    Science.gov (United States)

    Prince, Thomas; Zwicky Transient Facility (ZTF) Project Team

    2018-01-01

    The Zwicky Transient Faciility (ZTF) is a new survey camera mounted on the 1.2m Oschin Schmidt Telescope on Mount Palomar. The camera has a 47 square degree field of view and is expected to start public survey observations in early 2018. The public surveys are undertaken with support provided by the NSF MSIP program. One of the two public surveys is a twice nightly scan of the central Galactic Plane visible from Mount Palomar, one scan in r-band and one in g-band. Publicly accessible data from the survey will be one of two types: (1) prompt alerts of variable activity of Galactic Plane sources using image difference source identification, and (2) photometric light curves of Galactic Plane sources extracted from calibrated images. Data will be made accessible through the Caltech Image Processing and Analysis Center (IPAC). The ZTF Galactic Plane Survey, combined with Gaia and PanSTARRS data, will be an exciting new resource for time domain astronomy observations of Galactic sources.We will describe the details of the ZTF Galactic Plane survey, including estimated coverage of the plane and light curve sampling. We will also describe plans for public access to the data, as well as comment on some of the important science that will be possible using the survey data.

  8. Integral cesium reservoir: Design and transient operation

    Science.gov (United States)

    Smith, Joe N., Jr.; Horner, M. Harlan; Begg, Lester L.; Wrobleski, William J.

    An electrically heated thermionic converter has been designed built and successfully tested in air. One of the unique features of this converter was an integral cesium reservoir thermally coupled to the emitter. The reservoir consisted of fifteen cesiated graphite pins located in pockets situated in the emitter lead with thermal coupling to the emitter, collector and the emitter terminal; there were no auxiliary electric heaters on the reservoir. Test results are described for conditions in which the input thermal power to the converter was ramped up and down between 50% and 100% of full power in times as short as 50 sec, with data acquisition occurring every 12 sec. During the ramps the emitter and collector temperature profiles. the reservoir temperature and the electric output into a fixed load resistor are reported. The converter responded promptly to the power ramps without excessive overshoot and with no tendency to develop instabilities. This is the rust demonstration of the performance of a cesium-graphite integral reservoir in a fast transient.

  9. Transient translational quiescence in primordial germ cells.

    Science.gov (United States)

    Oulhen, Nathalie; Swartz, S Zachary; Laird, Jessica; Mascaro, Alexandra; Wessel, Gary M

    2017-04-01

    Stem cells in animals often exhibit a slow cell cycle and/or low transcriptional activity referred to as quiescence. Here, we report that the translational activity in the primordial germ cells (PGCs) of the sea urchin embryo ( Strongylocentrotus purpuratus ) is quiescent. We measured new protein synthesis with O-propargyl-puromycin and L-homopropargylglycine Click-iT technologies, and determined that these cells synthesize protein at only 6% the level of their adjacent somatic cells. Knockdown of translation of the RNA-binding protein Nanos2 by morpholino antisense oligonucleotides, or knockout of the Nanos2 gene by CRISPR/Cas9 resulted in a significant, but partial, increase (47%) in general translation specifically in the PGCs. We found that the mRNA of the translation factor eEF1A is excluded from the PGCs in a Nanos2-dependent manner, a consequence of a Nanos/Pumilio response element (PRE) in its 3'UTR. In addition to eEF1A, the cytoplasmic pH of the PGCs appears to repress translation and simply increasing the pH also significantly restores translation selectively in the PGCs. We conclude that the PGCs of this sea urchin institute parallel pathways to quiesce translation thoroughly but transiently. © 2017. Published by The Company of Biologists Ltd.

  10. Transient data acquisition techniques under EDS

    International Nuclear Information System (INIS)

    Telford, S.

    1985-06-01

    This paper is the first of a series which describes the Enrichment Diagnostic System (EDS) developed for the MARS project at Lawrence Livermore National Laboratory. Although EDS was developed for use on AVLIS, the functional requirements, overall design, and specific techniques are applicable to any experimental data acquisition system involving large quantities of transient data. In particular this paper will discuss the techniques and equipment used to do the data acquisition. Included are what types of hardware are used and how that hardware (CAMAC, digital oscilloscopes) is interfaced to the HP computers. In this discussion the author will address the problems encountered and the solutions used, as well as the performance of the instrument/computer interfaces. The second topic the author will discuss is how the acquired data is associated to graphics and analysis portions of EDS through efficient real time data bases. This discussion will include how the acquired data is folded into the overall structure of EDS providing the user immediate access to raw and analyzed data. By example you will see how easily a new diagnostic can be added to the EDS structure without modifying the other parts of the system. 8 figs

  11. Transient recovery voltages in offshore wind farms

    Energy Technology Data Exchange (ETDEWEB)

    King, R.; Jenkins, N. [Cardiff Univ. (United Kingdom); Yao, L.; Kang, H.; Rasolonjanahary, J.L. [ALSTOM Grid Research and Technology Centre, Staffordshire (United Kingdom)

    2010-07-01

    Transient Recovery Voltages (TRVs) and the corresponding Rate of Rise of Recovery Voltage (RRRV) which may be experienced by circuit breakers within offshore wind farms are assessed. In order to assess the TRV and RRRV capabilities of circuit breakers, it is important to model the system during various types and locations of faults. This means that the model used for the wind turbine needs to represent its fault current contribution. The paper reviews the fault current contribution from a simple induction generator, a doubly fed induction generator and a fully-fed machine, along with how this can be modeled in a TRV study. Simulations of an example offshore wind farm are carried out in EMTP-RV. Three phase and single phase faults are applied at a variety of locations, within the offshore wind farm in order to determine the TRVs which may be experienced by 33kV and 132kV circuit breakers. The effect of different wind turbine generator types on the TRVs is shown, along with the addition of reactive compensation. The main submarine cable length and the 33kV array cable lengths are varied to show that there may be particular cable lengths which produce higher magnitudes and rise times of the TRV. (orig.)

  12. Extreme Transients in the High Energy Universe

    Science.gov (United States)

    Kouveliotou, Chryssa

    2013-01-01

    The High Energy Universe is rich in diverse populations of objects spanning the entire cosmological (time)scale, from our own present-day Milky Way to the re-ionization epoch. Several of these are associated with extreme conditions irreproducible in laboratories on Earth. Their study thus sheds light on the behavior of matter under extreme conditions, such as super-strong magnetic fields (in excess of 10^14 G), high gravitational potentials (e.g., Super Massive Black Holes), very energetic collimated explosions resulting in relativistic jet flows (e.g., Gamma Ray Bursts, exceeding 10^53 ergs). In the last thirty years, my work has been mostly focused on two apparently different but potentially linked populations of such transients: magnetars (highly magnetized neutron stars) and Gamma Ray Bursts (strongly beamed emission from relativistic jets), two populations that constitute unique astrophysical laboratories, while also giving us the tools to probe matter conditions in the Universe to redshifts beyond z=10, when the first stars and galaxies were assembled. I did not make this journey alone I have either led or participated in several international collaborations studying these phenomena in multi-wavelength observations; solitary perfection is not sufficient anymore in the world of High Energy Astrophysics. I will describe this journey, present crucial observational breakthroughs, discuss key results and muse on the future of this field.

  13. Incidental Transient Cortical Blindness after Lung Resection

    Science.gov (United States)

    Oncel, Murat; Sunam, Guven Sadi; Varoglu, Asuman Orhan; Karabagli, Hakan; Yildiran, Huseyin

    2016-01-01

    Transient vision loss after major surgical procedures is a rare clinical complication. The most common etiologies are cardiac, spinal, head, and neck surgeries. There has been no report on vision loss after lung resection. A 65-year-old man was admitted to our clinic with lung cancer. Resection was performed using right upper lobectomy with no complications. Cortical blindness developed 12 hours later in the postoperative period. Results from magnetic resonance imaging and diffusion-weighted investigations were normal. The neurologic examination was normal. The blood glucose level was 92 mg/dL and blood gas analysis showed a PO 2 of 82 mm Hg. After 24 hours, the patient began to see and could count fingers, and his vision was fully restored within 72 hours after this point. Autonomic dysfunction due to impaired microvascular structures in diabetes mellitus may induce posterior circulation dysfunction, even when the hemodynamic state is normal in the perioperative period. The physician must keep in mind that vision loss may occur after lung resection due to autonomic dysfunction, especially in older patients with diabetes mellitus. PMID:28824977

  14. Transient magnetization in practical composite superconductors

    Energy Technology Data Exchange (ETDEWEB)

    Shen, S S

    1979-01-01

    This paper presents detailed magnetization measurements as well as analysis on typical cryostable NbTi composite conductors (1-mm diameter and Cu/SC ratio of 6:5) with filaments nonuniformly distributed in both circular and rectangular cross sections (aspect ratio approx. 2:1). As a result of the excellent agreement between the measurements and a previously reported transformer model, both transient magnetization and losses incurred in each sample can be described by functions of a unique time constant tau/sub 0/ which depends strongly on the shape of the cross section. Other prominent features of the measurement results such as the deduction of values of J/sub c/ and matrix resistivity are demonstrated. In an exponentially decaying field from 2T to 0, J/sub c/ is 4.5 x 10/sup 9/ A/m/sup 2/ at 1.5T, and the average matrix resistivity is 2.73 x 10/sup -10/ ..cap omega..-m. Saturation effects were also observed for field decaying time constant tau comparable with tau/sub 0/.

  15. SPIRT. Stress-Strains from Transient Pressures

    Energy Technology Data Exchange (ETDEWEB)

    Siefken, L.J. [EG and G Idaho, Inc., Idaho Falls, ID, (United States)

    1992-03-03

    The SPIRT (Stress-strains from Pressures Instigated by Reactor Transients) program was developed to predict the pressure generated by the rapid dispersal of molten UO2 from power-reactor-type fuel rods into the coolant water. This rapid dispersal of molten fuel results from very high-power excursions initiated by the rapid insertion of reactivity. SPIRT was used in the safety analyses of the ATR and ETR. The program can analyze the response of one-dimensional plane, cylindrical, and spherical geometric configurations to pressure-generating heat sources with free-surface or fixed-surface boundary conditions. SPIRT can calculate the response of systems to the dispersal of hot fuel particles as a function of the following variables: enthalpy of fuel at time of dispersal, rate at which fuel is dispersed, size of dispersed fuel droplets, dispersal density of fuel (grams of fuel dispersed per cc of water), quality of water at time of fuel dispersal, enthalpy of water at time of fuel dispersal, system pressure at time of fuel dispersal, and the size and constituency of the medium enveloping the dispersed fuel. By holding all but one of the listed variables constant, and varying that one, the program computes the relative effect of that variable upon the response of systems to the dispersal of hot fuel. SPIRT exists as two releases one, written for UO2 fuel is called SPIRTU; the second, for uranium-aluminide fuel is identified as SPIRTA.

  16. Transient burnout under rapid flow reduction condition

    International Nuclear Information System (INIS)

    Iwamura, Takamichi

    1987-01-01

    Burnout characteristics were experimentally studied using uniformly heated tube and annular test sections under rapid flow reduction conditions. Observations indicated that the onset of burnout under a flow reduction transient is caused by the dryout of a liquid film on the heated surface. The decrease in burnout mass velocity at the channel inlet with increasing flow reduction rate is attributed to the fact that the vapor flow rate continues to increase and sustain the liquid film flow after the inlet flow rate reaches the steady-state burnout flow rate. This is because the movement of the boiling boundary cannot keep up with the rapid reduction of inlet flow rate. A burnout model for the local condition could be applied to the burnout phenomena with the flow reduction under pressures of 0.5 ∼ 3.9 MPa and flow reduction rates of 0.6 ∼ 35 %/s. Based on this model, a method to predict the burnout time under a flow reduction condition was presented. The calculated burnout times agreed well with experimental results obtained by some investigators. (author)

  17. CW 316 mechanical properties during thermal transients

    International Nuclear Information System (INIS)

    Cauvin, R.; Boutard, J.L.; Allegraud, G.

    1984-06-01

    During in pile incidents, the cladding can experience higher temperatures than the nominal one; it is necessary to know the mechanical properties of the cladding material during such thermal transients to predict the time and location of rupture. Two types of tests have been developed: first tensile (constant strain rate) tests after a heating at a constant rate and secondly constant load tests where heating is performed until rupture occurs. The tensile tests clearly show the role of the heating rate: the higher is the heating rate, the lower is the cold work recovery. Constant load tests were conducted with either uniaxial or biaxial (burst tests) loading. The same stress/failure temperature relation is found in both types of loading using the Von Mises equivalent stress. To predict failure, the Larson Miller parameter is not adequate, as well as all parameters based on a time/temperature equivalence. The yield stress measured in the two types of tests are very different probably due to a strain rate effect. Indeed the tensile tests are dynamic ones to avoid thermal recovery during the test duration, while the strain rate measured in constant load tests ranges only from 10 -5 s -1 to 10 -3 s -1 , being an increasing function of heating rate (ranging from 1 0 c/s to 100 0 c/s)

  18. Engineered Promoters for Potent Transient Overexpression.

    Directory of Open Access Journals (Sweden)

    Dan Y Even

    Full Text Available The core promoter, which is generally defined as the region to which RNA Polymerase II is recruited to initiate transcription, plays a pivotal role in the regulation of gene expression. The core promoter consists of different combinations of several short DNA sequences, termed core promoter elements or motifs, which confer specific functional properties to each promoter. Earlier studies that examined the ability to modulate gene expression levels via the core promoter, led to the design of strong synthetic core promoters, which combine different core elements into a single core promoter. Here, we designed a new core promoter, termed super core promoter 3 (SCP3, which combines four core promoter elements (the TATA box, Inr, MTE and DPE into a single promoter that drives prolonged and potent gene expression. We analyzed the effect of core promoter architecture on the temporal dynamics of reporter gene expression by engineering EGFP expression vectors that are driven by distinct core promoters. We used live cell imaging and flow cytometric analyses in different human cell lines to demonstrate that SCPs, particularly the novel SCP3, drive unusually strong long-term EGFP expression. Importantly, this is the first demonstration of long-term expression in transiently transfected mammalian cells, indicating that engineered core promoters can provide a novel non-viral strategy for biotechnological as well as gene-therapy-related applications that require potent expression for extended time periods.

  19. Simplified methodology for control cell constant calculations of the reactor cores for the space kinetics; Metodologia simplificada para calculos das constantes das celulas de controles dos nucleos de reatores para a cinetica espacial

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Rubens Souza dos [Instituto de Engenharia Nuclear (IEN), Rio de Janeiro, RJ (Brazil); Martinez, Aquilino Senra; Alvim, Antonio Carlos Marques [Universidade Federal, Rio de Janeiro, RJ (Brazil). Coordenacao dos Programas de Pos-graduacao de Engenharia. Programa de Engenharia Nuclear

    2002-07-01

    In this work is presented a methodology which focuses the distribution of neutron absorber rods in nuclear reactor power plants, for utilizing in space kinetic calculations, principally in the cluster ejection transients of control rods. A numerical model for macroscopic constant calculations based on the knowledge of the neutron flux without the control rods is proposed, as alternative to the analytical models, based on the hypothesis of the null current on the cell super boundaries. The proposed model in this work has itself showed adequate to deal with problems with strong space dependence, once that the model showed consistence in the global average built in the analytical model. (author)

  20. First NuSTAR Limits on Quiet Sun Hard X-Ray Transient Events

    DEFF Research Database (Denmark)

    Marsh, Andrew J.; Smith, David M.; Glesener, Lindsay

    2017-01-01

    We present the first results of a search for transient hard X-ray (HXR) emission in the quiet solar corona with the Nuclear Spectroscopic Telescope Array (NuSTAR) satellite. While NuSTAR was designed as an astrophysics mission, it can observe the Sun above 2 keV with unprecedented sensitivity due...... to its pioneering use of focusing optics. NuSTAR first observed quiet-Sun regions on 2014 November 1, although out-of-view active regions contributed a notable amount of background in the form of single-bounce (unfocused) X-rays. We conducted a search for quiet-Sun transient brightenings on timescales...... as model-independent photon fluxes. The limits in both bands are well below previous HXR microflare detections, though not low enough to detect events of equivalent T and EM as quiet-Sun brightenings seen in soft X-ray observations. We expect future observations during solar minimum to increase the Nu...

  1. Recognition of Stroke by EMS is Associated with Improvement in Emergency Department Quality Measures.

    Science.gov (United States)

    Abboud, Michael E; Band, Roger; Jia, Judy; Pajerowski, William; David, Guy; Guo, Michelle; Mechem, C Crawford; Messé, Steven R; Carr, Brendan G; Mullen, Michael T

    2016-01-01

    Hospital arrival via Emergency Medical Services (EMS) and EMS prenotification are associated with faster evaluation and treatment of stroke. We sought to determine the impact of diagnostic accuracy by prehospital providers on emergency department quality measures. A retrospective study was performed of patients presenting via EMS between September 2009 and December 2012 with a discharge diagnosis of transient ischemic attack (TIA), ischemic stroke (IS), or intracerebral hemorrhage (ICH). Hospital and EMS databases were used to determine EMS impression, prehospital and in-hospital time intervals, EMS prenotification, NIH stroke scale (NIHSS), symptom duration, and thrombolysis rate. 399 cases were identified: 14.5% TIA, 67.2% IS, and 18.3% ICH. EMS providers correctly recognized 57.6% of cases. Compared to cases missed by EMS, correctly recognized cases had longer median on-scene time (17 vs. 15 min, p = 0.01) but shorter transport times (12 vs. 15 min, p = 0.001). Cases correctly recognized by EMS were associated with shorter door-to-physician time (4 vs. 11 min, p < 0.001) and shorter door-to-CT time (23 vs. 48 min, p < 0.001). These findings were independent of age, NIHSS, symptom duration, and EMS prenotification. Patients with ischemic stroke correctly recognized by EMS were more likely to receive thrombolytic therapy, independent of age, NIHSS, symptom duration both with and without prenotification. Recognition of stroke by EMS providers was independently associated with faster door-to-physician time, faster door-to-CT time, and greater odds of receiving thrombolysis. Quality initiatives to improve EMS recognition of stroke have the potential to improve hospital-based quality of stroke care.

  2. Transient response characteristics in a biomolecular integral controller.

    Science.gov (United States)

    Sen, Shaunak

    2016-04-01

    The cellular behaviour of perfect adaptation is achieved through the use of an integral control element in the underlying biomolecular circuit. It is generally unclear how integral action affects the important aspect of transient response in these biomolecular systems, especially in light of the fact that it typically deteriorates the transient response in engineering contexts. To address this issue, the authors investigated the transient response in a computational model of a simple biomolecular integral control system involved in bacterial signalling. They find that the transient response can actually speed up as the integral gain parameter increases. On further analysis, they find that the underlying dynamics are composed of slow and fast modes and the speed-up of the transient response is because of the speed-up of the slow-mode dynamics. Finally, they note how an increase in the integral gain parameter also leads to a decrease in the amplitude of the transient response, consistent with the overall improvement in the transient response. These results should be useful in understanding the overall effect of integral action on system dynamics, particularly for biomolecular systems.

  3. Scanning ion deep level transient spectroscopy: I. Theory

    International Nuclear Information System (INIS)

    Laird, J S; Jagadish, C; Jamieson, D N; Legge, G J F

    2006-01-01

    Theoretical aspects of a new technique for the MeV ion microbeam are described in detail for the first time. The basis of the technique, termed scanning ion deep level transient spectroscopy (SIDLTS), is the imaging of defect distributions within semiconductor devices. The principles of SIDLTS are similar to those behind other deep level transient spectroscopy (DLTS) techniques with the main difference stemming from the injection of carriers into traps using the localized energy-loss of a focused MeV ion beam. Energy-loss of an MeV ion generates an electron-hole pair plasma, providing the equivalent of a DLTS trap filling pulse with a duration which depends on space-charge screening of the applied electric field and ambipolar erosion of the plasma for short ranging ions. Some nanoseconds later, the detrapping current transient is monitored as a charge transient. Scanning the beam in conjunction with transient analysis allows the imaging of defect levels. As with DLTS, the temperature dependence of the transient can be used to extract trap activation levels. In this, the first of a two-part paper, we introduce the various stages of corner capture and derive a simple expression for the observed charge transient. The second paper will illustrate the technique on a MeV ion implanted Au-Si Schottky junction

  4. Spatial distributions at equilibrium under heterogeneous transient subdiffusion.

    Science.gov (United States)

    Berry, Hugues; Soula, Hédi A

    2014-01-01

    Experimental measurements of the mobility of macromolecules, especially proteins, in cells and their membranes consistently report transient subdiffusion with possibly position-dependent-non-homogeneous-properties. However, the spatiotemporal dynamics of protein mobility when transient subdiffusion is restricted to a subregion of space is still unclear. Here, we investigated the spatial distribution at equilibrium of proteins undergoing transient subdiffusion due to continuous-time random walks (CTRW) in a restricted subregion of a two-dimensional space. Our Monte-Carlo simulations suggest that this process leads to a non-homogeneous spatial distribution of the proteins at equilibrium, where proteins increasingly accumulate in the CTRW subregion as its anomalous properties are increasingly marked. In the case of transient CTRW, we show that this accumulation is dictated by the asymptotic Brownian regime and not by the initial anomalous transient dynamics. Moreover, our results also show that this dominance of the asymptotic Brownian regime cannot be simply generalized to other scenarios of transient subdiffusion. In particular, non-homogeneous transient subdiffusion due to hindrance by randomly-located immobile obstacles does not lead to such a strong local accumulation. These results suggest that, even though they exhibit the same time-dependence of the mean-squared displacement, the different scenarios proposed to account for subdiffusion in the cell lead to different protein distribution in space, even at equilibrium and without coupling with reaction.

  5. Spatial distributions at equilibrium under heterogeneous transient subdiffusion

    Directory of Open Access Journals (Sweden)

    Hugues eBerry

    2014-11-01

    Full Text Available Experimental measurements of the mobility of macromolecules, especially proteins, in cells and their membranes consistently report transient subdiffusion with possibly position-dependent -- nonhomogeneous -- properties. However, the spatiotemporal dynamics of protein mobility when transient subdiffusion is restricted to a subregion of space is still unclear. Here, we investigated the spatial distribution at equilibrium of proteins undergoing transient subdiffusion due to continuous-time random walks (CTRW in a restricted subregion of a two-dimensional space. Our Monte-Carlo simulations suggest that this process leads to a nonhomogeneous spatial distribution of the proteins at equilibrium, where proteins increasingly accumulate in the CTRW subregion as its anomalous properties are increasingly marked. In the case of transient CTRW, we show that this accumulation is dictated by the asymptotic Brownian regime and not by the initial anomalous transient dynamics. Moreover, our results also show that this dominance of the asymptotic Brownian regime cannot be simply generalized to other scenarios of transient subdiffusion. In particular, nonhomogeneous transient subdiffusion due to hindrance by randomly-located immobile obstacles does not lead to such a strong local accumulation. These results suggest that, even though they exhibit the same time-dependence of the mean-squared displacement, the different scenarios proposed to account for subdiffusion in the cell lead to different protein distribution in space, even at equilibrium and without coupling with reaction.

  6. <em>Angiostrongylus vasorumem> in red foxes (<em>Vulpes vulpesem> and badgers (<em>Meles melesem> from Central and Northern Italy

    Directory of Open Access Journals (Sweden)

    Marta Magi

    2010-06-01

    Full Text Available Abstract During 2004-2005 and 2007-2008, 189 foxes (<em>Vulpes vulpesem> and 6 badgers (<em>Meles melesem> were collected in different areas of Central Northern Italy (Piedmont, Liguria and Tuscany and examined for <em>Angiostrongylus vasorumem> infection. The prevalence of the infection was significantly different in the areas considered, with the highest values in the district of Imperia (80%, Liguria and in Montezemolo (70%, southern Piedmont; the prevalence in Tuscany was 7%. One badger collected in the area of Imperia turned out to be infected, representing the first report of the parasite in this species in Italy. Further studies are needed to evaluate the role played by fox populations as reservoirs of infection and the probability of its spreading to domestic dogs.
    Riassunto <em>Angiostrongylus vasorumem> nella volpe (<em>Vulpes vulpesem> e nel tasso (<em>Meles melesem> in Italia centro-settentrionale. Nel 2004-2005 e 2007-2008, 189 volpi (<em>Vulpes vulpesem> e 6 tassi (<em>Meles melesem> provenienti da differenti aree dell'Italia settentrionale e centrale (Piemonte, Liguria Toscana, sono stati esaminati per la ricerca di <em>Angiostrongylus vasorumem>. La prevalenza del nematode è risultata significativamente diversa nelle varie zone, con valori elevati nelle zone di Imperia (80% e di Montezemolo (70%, provincia di Cuneo; la prevalenza in Toscana è risultata del 7%. Un tasso proveniente dall'area di Imperia è risultato positivo per A. vasorum; questa è la prima segnalazione del parassita in tale specie in Italia. Ulteriori studi sono necessari per valutare il potenziale della volpe come serbatoio e la possibilità di diffusione della parassitosi ai cani domestici.

    doi:10.4404/hystrix-20.2-4442

  7. International EMS Systems

    DEFF Research Database (Denmark)

    Langhelle, Audun; Lossius, Hans Morten; Silfvast, Tom

    2004-01-01

    Emergency medicine service (EMS) systems in the five Nordic countries have more similarities than differences. One similarity is the involvement of anaesthesiologists as pre-hospital physicians and their strong participation for all critically ill and injured patients in-hospital. Discrepancies do...... exist, however, especially within the ground and air ambulance service, and the EMS systems face several challenges. Main problems and challenges emphasized by the authors are: (1) Denmark: the dispatch centres are presently not under medical control and are without a national criteria based system...... is the only country that has emergency medicine (EM) as a recognised speciality but there is a need for more fully trained specialists in EM; (4) Norway: the ordinary ground ambulance is pointed out as the weakest link in the EM chain and a health reform demands extensive co-operation between the new health...

  8. Air Heating Associated with Transient Luminous Events

    Science.gov (United States)

    Riousset, J. A.; Pasko, V. P.; Bourdon, A.

    2009-12-01

    The understanding of ambient gas heating processes initiated by needle-shaped filaments of ionization, called streamers, embedded in originally cold air (near room temperature) represents a long standing problem, which is of interest for studies of long laboratory sparks and natural lightning discharges [e.g., Gallimberti et al., C. R. Physique, 3, 1335, 2002]. The observed phenomenology of a subset of the recently observed transient luminous events in the middle atmosphere, which originate from thundercloud tops [e.g, Wescott et al., JGR, 106, 21549, 2001; Pasko et al., Nature, 416, 152, 2002; Su et al., Nature, 423, 974, 2003; Krehbiel et al., Nature Geoscience, 1, 233, 2008; Cummer et al., Nature Geoscience, 2, 617, 2009, Riousset et al., JGR, 10.1029/2009JA014286, 2009, in press], indicate that these events may be related to conventional lightning leader processes and therefore are associated with significant heating of the air in the regions of atmosphere through which they propagate [Pasko and George, JGR, 107, 1458, 2002]. Many of the small scale features observed in sprites at higher altitudes [e.g., Stenbaek-Nielsen et al., GRL, 104, L11105, 2007, and references therein] can be interpreted in terms of corona streamers, which, after appropriate scaling with air density, are fully analogous to those, which initiate spark discharges in relatively short (several cm) gaps at near ground pressure [Liu et al., JGR, 114, A00E03, 2009, and references therein] and which constitute building blocks of streamer zones of conventional lightning leaders in long gaps [Gallimberti et al., 2002]. The recent reports of infrasound bursts originating from 60-80 km altitudes in sprites, with durations consistent with the optical widths of the sprites [e.g., Farges, in Lightning: Principles, Instruments and Applications, p. 417, Betz et al., (eds.), Springer, 2009], provide an additional motivation for studies of the heating of the ambient air and associated chemical effects

  9. Heinrich events modeled in transient glacial simulations

    Science.gov (United States)

    Ziemen, Florian; Kapsch, Marie; Mikolajewicz, Uwe

    2017-04-01

    Heinrich events are among the most prominent events of climate variability recorded in proxies across the northern hemisphere. They are the archetype of ice sheet — climate interactions on millennial time scales. Nevertheless, the exact mechanisms that cause Heinrich events are still under debate, and their climatic consequences are far from being fully understood. We address open questions by studying Heinrich events in a coupled ice sheet model (ISM) atmosphere-ocean-vegetation general circulation model (AOVGCM) framework, where this variability occurs as part of the model generated internal variability. The framework consists of a northern hemisphere setup of the modified Parallel Ice Sheet Model (mPISM) coupled to the global AOVGCM ECHAM5/MPIOM/LPJ. The simulations were performed fully coupled and with transient orbital and greenhouse gas forcing. They span from several millennia before the last glacial maximum into the deglaciation. To make these long simulations feasible, the atmosphere is accelerated by a factor of 10 relative to the other model components using a periodical-synchronous coupling technique. To disentangle effects of the Heinrich events and the deglaciation, we focus on the events occurring before the deglaciation. The modeled Heinrich events show a peak ice discharge of about 0.05 Sv and raise the sea level by 2.3 m on average. The resulting surface water freshening reduces the Atlantic meridional overturning circulation and ocean heat release. The reduction in ocean heat release causes a sub-surface warming and decreases the air temperature and precipitation regionally and downstream into Eurasia. The surface elevation decrease of the ice sheet enhances moisture transport onto the ice sheet and thus increases precipitation over the Hudson Bay area, thereby accelerating the recovery after an event.

  10. Transient nature of late Pleistocene climate variability.

    Science.gov (United States)

    Crowley, Thomas J; Hyde, William T

    2008-11-13

    Climate in the early Pleistocene varied with a period of 41 kyr and was related to variations in Earth's obliquity. About 900 kyr ago, variability increased and oscillated primarily at a period of approximately 100 kyr, suggesting that the link was then with the eccentricity of Earth's orbit. This transition has often been attributed to a nonlinear response to small changes in external boundary conditions. Here we propose that increasing variablility within the past million years may indicate that the climate system was approaching a second climate bifurcation point, after which it would transition again to a new stable state characterized by permanent mid-latitude Northern Hemisphere glaciation. From this perspective the past million years can be viewed as a transient interval in the evolution of Earth's climate. We support our hypothesis using a coupled energy-balance/ice-sheet model, which furthermore predicts that the future transition would involve a large expansion of the Eurasian ice sheet. The process responsible for the abrupt change seems to be the albedo discontinuity at the snow-ice edge. The best-fit model run, which explains almost 60% of the variance in global ice volume during the past 400 kyr, predicts a rapid transition in the geologically near future to the proposed glacial state. Should it be attained, this state would be more 'symmetric' than the present climate, with comparable areas of ice/sea-ice cover in each hemisphere, and would represent the culmination of 50 million years of evolution from bipolar nonglacial climates to bipolar glacial climates.

  11. Acute transient hemiparesis induced by lightning strike.

    Science.gov (United States)

    Rahmani, Seyed Hesam; Faridaalaee, Gholamreza; Jahangard, Samira

    2015-07-01

    According to data from the National Oceanic and Atmospheric Administration,in the years from 1959 to 1994, lightning was responsible for more than 3000 deaths and nearly 10,000 casualties. The most important characteristic features of lightning injuries are multisystem involvement and widely variable severity. Lightning strikes are primarily a neurologic injury that affects all 3 components of the nervous system: central, autonomic,and peripheral. Neurologic complications of lightning strikes vary from transient benign symptoms to permanent disability. Many patients experience a temporary paralysis called keraunoparalysis. Here we reported a 22-year-old mountaineer man with complaining of left sided hemiparesis after being hit by a lightning strike in the mountain 3 hours ago. There was no loss of consciousness at hitting time. On arrival the patient was alert, awake and hemodynamically stable. In neurologic examination cranial nerves were intact, left sided upper and lower extremity muscle force was I/V with a combination of complete sensory loss, and right-sided muscle force and sensory examination were normal. There is not any evidence of significant vascular impairment in the affected extremities. Brain MRI and CT scan and cervical MRI were normal. During 2 days of admission, with intravenous hydration, heparin 5000 unit SC q12hr and physical therapy of the affected limbs, motor and sensory function improved and was normal except mild paresthesia. He was discharged 1 day later for outpatient follow up while vitamin B1 100mg orally was prescribed.Paresthesia improved after 3 days without further sequels.

  12. Transient thermal effects in Alpine permafrost

    Directory of Open Access Journals (Sweden)

    J. Noetzli

    2009-04-01

    Full Text Available In high mountain areas, permafrost is important because it influences the occurrence of natural hazards, because it has to be considered in construction practices, and because it is sensitive to climate change. The assessment of its distribution and evolution is challenging because of highly variable conditions at and below the surface, steep topography and varying climatic conditions. This paper presents a systematic investigation of effects of topography and climate variability that are important for subsurface temperatures in Alpine bedrock permafrost. We studied the effects of both, past and projected future ground surface temperature variations on the basis of numerical experimentation with simplified mountain topography in order to demonstrate the principal effects. The modeling approach applied combines a distributed surface energy balance model and a three-dimensional subsurface heat conduction scheme. Results show that the past climate variations that essentially influence present-day permafrost temperatures at depth of the idealized mountains are the last glacial period and the major fluctuations in the past millennium. Transient effects from projected future warming, however, are likely larger than those from past climate conditions because larger temperature changes at the surface occur in shorter time periods. We further demonstrate the accelerating influence of multi-lateral warming in steep and complex topography for a temperature signal entering the subsurface as compared to the situation in flat areas. The effects of varying and uncertain material properties (i.e., thermal properties, porosity, and freezing characteristics on the subsurface temperature field were examined in sensitivity studies. A considerable influence of latent heat due to water in low-porosity bedrock was only shown for simulations over time periods of decades to centuries. At the end, the model was applied to the topographic setting of the Matterhorn

  13. Adult neurogenesis transiently generates oxidative stress.

    Directory of Open Access Journals (Sweden)

    Noah M Walton

    Full Text Available An increasing body of evidence suggests that alterations in neurogenesis and oxidative stress are associated with a wide variety of CNS diseases, including Alzheimer's disease, schizophrenia and Parkinson's disease, as well as routine loss of function accompanying aging. Interestingly, the association between neurogenesis and the production of reactive oxidative species (ROS remains largely unexamined. The adult CNS harbors two regions of persistent lifelong neurogenesis: the subventricular zone and the dentate gyrus (DG. These regions contain populations of quiescent neural stem cells (NSCs that generate mature progeny via rapidly-dividing progenitor cells. We hypothesized that the energetic demands of highly proliferative progenitors generates localized oxidative stress that contributes to ROS-mediated damage within the neuropoietic microenvironment. In vivo examination of germinal niches in adult rodents revealed increases in oxidized DNA and lipid markers, particularly in the subgranular zone (SGZ of the dentate gyrus. To further pinpoint the cell types responsible for oxidative stress, we employed an in vitro cell culture model allowing for the synchronous terminal differentiation of primary hippocampal NSCs. Inducing differentiation in primary NSCs resulted in an immediate increase in total mitochondria number and overall ROS production, suggesting oxidative stress is generated during a transient window of elevated neurogenesis accompanying normal neurogenesis. To confirm these findings in vivo, we identified a set of oxidation-responsive genes, which respond to antioxidant administration and are significantly elevated in genetic- and exercise-induced model of hyperactive hippocampal neurogenesis. While no direct evidence exists coupling neurogenesis-associated stress to CNS disease, our data suggest that oxidative stress is produced as a result of routine adult neurogenesis.

  14. Aplicação de espumas cerâmicas produzidas via "gelcasting" em biorreator para tratamento anaeróbio de águas residuárias Use of ceramic foams produced via gelcasting in bioreactor for anaerobic treatment of wastewater

    Directory of Open Access Journals (Sweden)

    F. S. Ortega

    2001-12-01

    Full Text Available O desenvolvimento da biotecnologia anaeróbia de tratamento de águas residuárias, resultou em novas configurações de biorreatores, nas quais uma importante característica é a existência de condições favoráveis à imobilização de biomassa ativa responsável pela degradação biológica de resíduos poluentes. Características como a resistência à degradação biológica e boa resistência mecânica associadas a uma estrutura celular fazem das espumas cerâmicas excelentes candidatas à fabricação de suportes para imobilização da biomassa. Neste trabalho, utilizou-se o processo "gelcasting" associado à aeração de uma suspensão para produzir suportes de espuma cerâmica. Foram utilizadas alumina e caulinita, materiais estes em que predominam cargas superficiais positiva e negativa, respectivamente, na faixa de pH 7, em que operam os reatores. Após a queima, as espumas foram caracterizadas quanto à densidade aparente e à permeabilidade, e em seguida submetidas a um ciclo de 35 dias em reator diferencial alimentado com esgoto sanitário sintético. Materiais como argila expandida e borracha de etileno-propileno (EPR foram submetidos a ciclo similar e comparados aos materiais cerâmicos. Os resultados permitem avaliar as vantagens e desvantagens das espumas cerâmicas como suporte para a imobilização de microorganismos frente a outros materiais.The development of anaerobic biotechnology for treatment of wastewater has led to new configurations of bioreactors, which have as an important feature the establishment of favorable conditions for the fixation of biomass that will degrade organic material present in wastewaters. Characteristics such as high resistance to biological degradation and high mechanical strength, coupled to cellular structure make ceramic foams an excellent option for the production of supports for biomass immobilization. In this work, the gelcasting process in association with the aeration of a ceramic

  15. Baixa prevalência de PPD reativo prévia ao uso de infliximabe: estudo comparativo em população amostral do Hospital Geral de Fortaleza Low prevalence of reactive PPD prior to infliximab use: comparative study on a population sample of Hospital Geral de Fortaleza

    Directory of Open Access Journals (Sweden)

    Maria Roseli Monteiro Callado

    2011-02-01

    Full Text Available OBJETIVO: Identificar infecção tuberculosa em pacientes reumatológicos em uso de infliximabe, através do PPD realizado como pré-requisito ao início da terapia. MÉTODOS: Foram estudados 157 pacientes em uso de infliximabe e 734 outros pacientes sob triagem de infecção tuberculosa, procedentes de diversas clínicas. O PPD foi realizado pela técnica de Mantoux e considerado reator a partir de 5 mm. RESULTADOS: No grupo infliximabe, o PPD foi reator em 13% e, entre os outros pacientes, a reatividade foi de 27% (χ2 = 13; P = 0,0003. Estes foram subdivididos em adultos portadores de doenças crônicas, com 22% de reatividade ao PPD e demais controles com 31% de positividade, demonstrando heterogeneidade de resposta nessa população (χ2 = 7; P OBJECTIVE: To identify tuberculosis infection in rheumatic patients on infliximab by use of PPD testing prior to immunobiologic therapy. METHODS: This study comprised 157 patients undergoing infliximab treatment and 734 other patients undergoing laboratory screening for tuberculosis infection originating from several services. The Mantoux technique was used for PPD testing, and an induration of at least 5 mm was considered reactive status. RESULTS: In the infliximab group, 13% of the patients reacted to PPD, while, in the other group, 27% of the patients reacted to PPD (χ2 = 13; P = 0.0003. These patients were divided into categories: adults with chronic diseases, PPD reactivity of 22%; and other controls, PPD reactivity of 31%. This shows the heterogeneous response of that population (χ2 = 7; P < 0.009. In the infliximab group, subdivided according to pathologies [rheumatoid arthritis (RA, ankylosing spondylitis (AS, and psoriatic arthritis (PA], different reactivity rates were observed, the lowest value occurring among RA patients: (RA x AS: OR = 0.13; CI: 0.03-0.47; χ2 = 12; P = 0.0004 and (RA x PA: OR = 0.16; CI: 0.02-1.04; χ2Yates corrected = 3.6; P = 0.05. The PPD reactivity in the RA

  16. Transient Aspects of Wave Propagation Connected with Spatial Coherence

    Directory of Open Access Journals (Sweden)

    Ezzat G. Bakhoum

    2013-01-01

    Full Text Available This study presents transient aspects of light wave propagation connected with spatial coherence. It is shown that reflection and refraction phenomena involve spatial patterns which are created within a certain transient time interval. After this transient time interval, these patterns act like a memory, determining the wave vector for subsequent sets of reflected/refracted waves. The validity of this model is based on intuitive aspects regarding phase conservation of energy for waves reflected/refracted by multiple centers in a certain material medium.

  17. Simulation of hot-channel transients for PHWR reactors

    International Nuclear Information System (INIS)

    Masriera, N.A.

    1988-01-01

    For the simulation of transients a whole-plant code is needed. These codes model the core in a very simplified way. When local variables have to be calculated a different kind of code is needed: a subchannel-code. This report studies the use of the cobra code as a subchannel-code, for the simulation of a PHWR fuel channel, considering that this code was developed for PWR cores calculation. A special effort is made to obtain optimized models for different calculations: steady state, soft transients and severe transients. These models differ in number of subchannels, axial nodes, and the choice of the most important variables. (Author) [es

  18. Transient Storage in Zero-Order Channels Draining Arctic Hillslopes

    Science.gov (United States)

    Cook, C. L.; Harms, T.; Wlostowski, A. N.; Gooseff, M. N.

    2015-12-01

    Water tracks are linear regions of preferential hydrologic flow on arctic hillslopes that discharge to lakes and higher-order streams. In comparison to headwater streams, which encompass flow velocities of 0.1 - 1.0 + m/s, water velocity in water tracks ranges 0.001 - 0.1 m/s, suggesting the potential for significant interaction of water and solutes with transient storage zones in hillslopes compared to streams. Transient storage, the temporary retention of water and solutes in slow-flowing water, contributes to increased water residence time and thus the exposure of water and associated solutes to biochemically reactive substrates. Seasonal patterns in thaw depth of hillslope soils and discharge from hillslopes in the Arctic suggest that the relative contribution of transient storage zones might show predictable seasonal- and event-scale patterns. We conducted slug injections of a conservative solute (NaCl) in two water tracks in the Kuparuk River watershed, Alaska, during two summers to characterize how transient storage varied with thaw depth and discharge. The resulting break-through curves were separated into three dominant processes using an analytical advection-dispersion model: 1) salt mass primarily moved by advection and dispersion, 2) salt mass experiencing transient storage, and 3) a mass loss term. Across all tracer experiments, the mean percentage of total injected tracer mass associated with transient storage was 54%. This is comparable to a peat-bottomed stream but greater than a cobble-lined channel in a nearby catchment. However, transient storage was variable among experiments (1.3 - 72%). Discharge was also variable across experiments, ranging 0.05 - 3.5 L/s, and there was a negative correlation between transient storage and discharge. Thus, we expect significant interaction of solutes with soils in water tracks during inter-storm periods, when the majority of water moving through water tracks enters transient storage zones. We did not see a

  19. Thermal-hydraulic analysis of PWR cores in transient condition

    International Nuclear Information System (INIS)

    Silva Galetti, M.R. da.

    1984-01-01

    A calculational methodology for thermal - hydraulic analysis of PWR cores under steady-state and transient condition was selected and made available to users. An evaluation of the COBRA-IIIP/MIT code, used for subchannel analysis, was done through comparison of the code results with experimental data on steady state and transient conditions. As a result, a comparison study allowing spatial and temporal localization of critical heat flux was obtained. A sensitivity study of the simulation model to variations in some empirically determined parameter is also presented. Two transient cases from Angra I FSAR were analysed, showing the evolution of minimum DNBR with time. (Author) [pt

  20. Calculations of near-field emissions in frequency-domain into time-dependent data with arbitrary wave form transient perturbations

    Directory of Open Access Journals (Sweden)

    Y. Liu

    2012-09-01

    Full Text Available This paper is devoted on the application of the computational method for calculating the transient electromagnetic (EM near-field (NF radiated by electronic structures from the frequency-dependent data for the arbitrary wave form perturbations i(t. The method proposed is based on the fast Fourier transform (FFT. The different steps illustrating the principle of the method is described. It is composed of three successive steps: the synchronization of the input excitation spectrum I(f and the given frequency data H0(f, the convolution of the two inputs data and then, the determination of the time-domain emissions H(t. The feasibility of the method is verified with standard EM 3D simulations. In addition to this method, an extraction technique of the time-dependent z-transversal EM NF component Xz(t from the frequency-dependent x- and y- longitudinal components Hx(f and Hy(f is also presented. This technique is based on the conjugation of the plane wave spectrum (PWS transform and FFT. The feasibility of the method is verified with a set of dipole radiations. The method introduced in this paper is particularly useful for the investigation of time-domain emissions for EMC applications by considering transient EM interferences (EMIs.