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Sample records for cinzas volantes comparing

  1. O estudo mineralógico das cinzas volantes brasileiras: origem, caracteristicas e qualidade

    OpenAIRE

    Yushiro Kihara

    1983-01-01

    As cinzas volantes são resíduos fundamentalmente sílico-aluminosos, finamente divididos, provenientes da combustão do carvão mineral pulverizado, utilizado em usinas termelétricas. São considerados materiais pozolânicos, à semelhança das cinzas vulcânicas ácidas, por apresentarem capacidade de reação com a cal, em presença de água, originando a formação de compostos novos com propriedades aglomerantes. Estudaram-se 31 amostras de cinzas volantes das cinco principais termelétricas brasileiras ...

  2. Comparativo das propriedades do concreto autoadensável (CAA utilizando areia fina e cinza volante

    Directory of Open Access Journals (Sweden)

    B. F. Tutikian

    Full Text Available O objetivo deste artigo é contribuir para a tomada de decisão sobre a definição do uso de materiais finos responsáveis pela resistência à segregação do concreto auto-adensável (CAA. Neste estudo, amostras de CAA foram dosadas com cinza volante, um material pozolânico, e areia fina, que é um material não pozolânico, utilizando o método de dosagem proposto por Tutikian & Dal Molin (2007 [1]. Foi observado que a utilização de cinza volante aumentou a resistência à compressão, principalmente nas idades mais avançadas, assim como os valores de módulo de deformação e velocidade das ondas de ultrasom. Também diminuiu a penetração de íons cloretos, para os mesmos valores de resistência em comparação com os CAA com areia fina e o custo final dos CAA com cinza volante foi inferior. Foram apresentados tanto os diagramas de dosagem como os de desempenho.

  3. Contribuição da adição de cinzas volantes para a melhoria da durabilidade do betão

    OpenAIRE

    Camões, Aires; Rocha, Patrício; Aguiar, J. L. Barroso de; Jalali, Said; Delgado, Raimundo

    2002-01-01

    Esta comunicação pretende demonstrar que recorrendo a materiais correntes e à substituição de cimento por cinzas volantes é possível produzir betões de elevado desempenho, sem prejuízo das suas características de durabilidade. Através da adição de cinzas volantes é possível reduzir significativamente o consumo de cimento e com a utilização de agregados britados, designadamente areias, contribuir para a preservação dos recursos naturais não renováveis existentes.

  4. Síntese e caracterização de zeólitas obtidas a partir de cinzas volantes de carvão

    OpenAIRE

    Luciane Venturini Lacerda; Annelise Kopp Alves; Felipe Amorim Berutti

    2015-01-01

    Usinas termoelétricas a carvão geram aproximadamente 3 milhões de toneladas de cinzas ao ano. Estas cinzas podem receber uma aplicação nobre como, por exemplo, fotocatalisadores aplicados à descontaminação de águas poluídas por corantes da indústria têxtil. Isso é possível através de utilização das cinzas como fonte de silício para a síntese de zeólitas. Desta forma, neste trabalho foram sintetizadas zeólitas do tipo sodalita, utilizando-se cinzas volantes de carvão da região de Candiota-RS, ...

  5. Síntese e caracterização de zeólitas obtidas a partir de cinzas volantes de carvão

    Directory of Open Access Journals (Sweden)

    Luciane Venturini Lacerda

    2015-12-01

    Full Text Available Usinas termoelétricas a carvão geram aproximadamente 3 milhões de toneladas de cinzas ao ano. Estas cinzas podem receber uma aplicação nobre como, por exemplo, fotocatalisadores aplicados à descontaminação de águas poluídas por corantes da indústria têxtil. Isso é possível através de utilização das cinzas como fonte de silício para a síntese de zeólitas. Desta forma, neste trabalho foram sintetizadas zeólitas do tipo sodalita, utilizando-se cinzas volantes de carvão da região de Candiota-RS, com diferentes teores de alumínio, e na presença de NaOH como alcalinizante, variando-se o tempo de envelhecimento. Os produtos formados foram caracterizados por DRX, isotermas de adsorção de N2 (BET e sua morfologia foi analisada por MEV e MET. A atividade fotocatalítica foi medida através do acompanhamento da degradação de solução contendo o corante azul de metileno. Os resultados indicaram que a razão Si:Al e o tempo de envelhecimento influenciam significativamente as propriedades da zeólita sintetizada. A zeólita obtida é do tipo sodalita, formada por aglomerados com partículas primárias de 100nm, cuja área superficial é de aproximadamente 6 m2/g. A atividade fotocatalítica foi bastante significativa e foram observados indicativos de propriedades adsorventes.

  6. Estudo dos efeitos do LiNO3 na reação Álcali-Sílica e comparação com os efeitos da cinza volante na reação

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    D. J. F. Silva

    Full Text Available Várias pesquisas realizadas com compostos a base de lítio tem mostrado resultados satisfatórios na redução da expansão associada à reação álcali-sílica (RAS, mas ainda existem muitas dúvidas sobre seus mecanismos de ação. A presente pesquisa avaliou os efeitos de uma adição química a base de nitrato de lítio (LiNO 3, utilizando várias dosagens, com o objetivo de entender seus mecanismos de ação sobre a expansão associada a RAS. O estudo dos efeitos do LiNO3 na RAS foi feito pelo método acelerado das barras de argamassa (ASTM C-1260, utilizando dois tipos de agregado reativo, levando o ensaio até 30 dias. Foram moldadas também barras de argamassa com uma adição mineral a base de cinza volante com o objetivo de comparar os efeitos de uma adição mineral com uma química na expansão devido a RAS. Os resultados do en- saio da ASTM C-1260 indicaram que as adições de lítio foram efetivas na redução da expansão, mas apresentaram valores de adição diferentes para o limite aceitável de 0.10% aos 14 dias para cada tipo de agregado. Foi observado também que as misturas contendo LiNO3 reduziram a expansão ao longo dos 30 dias, enquanto nas misturas contendo cinza volante a expansão continuou a aumentar ao longo do teste. O ensaio indicou que as dosagens de adição do lítio (Li2O/Na2Oeq eficazes na redução da expansão foram muito elevado em relação aos encontrados na literatura, mostrando que segundo Folliard et al. (2003, o uso de cimento com elevado teor de álcalis (Na2Oeq= 0.9 ± 1.0% e a modificação da ASTM C-1260, seria a melhor solução para obter valores de adição de lítio compatíveis com o de uso em campo.

  7. Cementos con cenizas volantes

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    Ossa M., Mauricio

    1984-03-01

    additions of 20 and 30% .

    Casi la generalidad de los estudios realizados sobre cementos con adición de cenizas volantes se refieren a sus características y comportamiento en pastas, morteros y hormigones, siempre en relación con aquéllos del cemento portland. Esta vez, se desarrolló un trabajo experimental orientado a relacionar entre sí los cementos con adiciones de cenizas volantes y de puzolana natural. Para ello se fabricaron a escala de laboratorio cementos de ambos tipos, empleando como materias primas comunes clinker y yeso y, como variables, diferentes porcentajes de las dos adiciones, que cumplieron previamente los requisitos normalizados en cuanto a sus actividades puzolánicas. La calidad de los cementos fabricados resultó adecuada y concordante con la del cemento portland-puzolánico obtenido a escala industrial con los mismos clinker, yeso y puzolana natural de este estudio. Posteriormente, se determinaron las características de los cementos experimentales y se confeccionaron morteros normales para la realización de ensayos físicos y mecánicos. Los resultados de ensayos indicaron que los cementos con adición de cenizas volantes (CCV requieren menos agua para consistencia normal, presentan tiempos de fraguado mayores y expansiones en autoclave menores que los cementos con adición de puzolana (CP. Los calores de hidratación a 7 y 28 días de edad fueron aproximadamente similares para ambos tipos de cemento. En morteros normales, los cementos CCV mostraron menor retracción de secado, mayor retentividad y mayor fluidez (para igual cantidad de agua que los cementos CP. En los ensayos de exudación se observó que ésta depende más de la finura que el tipo de adición. Finalmente, los ensayos mecánicos señalaron que las resistencias a compresión y flexotracción de los morteros con cementos CCV son menores a edades inferiores que 14 días (del orden de 5 a 10% a un día de edad, pero que a partir de entonces pasan a ser mayores que las de

  8. Cinzas de biomassa geradas na agroindústria do cacau: caracterização e uso em substituição ao cimento

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    Rebeca Bastos Silva

    Full Text Available ResumoCinza de biomassa é um resíduo sólido gerado em grande quantidade em caldeiras para produção de energia e calor. Na indústria de processamento de cacau, que usa casca de amêndoa de cacau (20% e madeira de eucalipto (80% como combustível, são geradas cinzas volantes e cinzas de fundo, cujas propriedades são pouco conhecidas, o que limita sua correta disposição ou aplicação. Neste trabalho, cinza fornalha (fundo e ciclone (volante foram coletadas, durante o processo de limpeza da caldeira, e caracterizadas quanto a composição química, morfologia (MEV, granulometria e mineralogia (DR-X com o objetivo de avaliar a potencialidade das cinzas para uso como adição mineral. As cinzas foram beneficiadas com moagem e queima controlada a 500, 700 e 900º C. Para avaliação do efeito da cinza, foram moldadas quatro argamassas com 5% de substituição de cimento por cinza ciclone e cinza fornalha, in natura e moídas. Os resultados dos testes de absorção de água e resistência mecânica (compressão e tração na flexão demonstraram um aumento da absorção e da porosidade para todas as misturas, mas a manutenção das propriedades mecânicas para mistura com cinza ciclone moída, quando comparada com a argamassa sem adição, demonstrando a potencialidade desta cinza como adição mineral.

  9. Between honour and condemnation : Eduardas Cinzas

    OpenAIRE

    Židonis, Giedrius

    2005-01-01

    Eduardas Cinzas (1924–1995) takes a special place among the Lithuanian exile prose writers both because of his exceptional fate and his unconventional plots and characters. In his fiction, he avoided overt use of Lithuanian themes and concentrated on creating realistic images of post-war Belgium, in which he lived at the time. To a large extent his fiction is autobiographical – the author speaks about various life situations which he experienced himself. Cinzas’ prose is about complicated...

  10. Predictable evolution toward flightlessness in volant island birds.

    Science.gov (United States)

    Wright, Natalie A; Steadman, David W; Witt, Christopher C

    2016-04-26

    Birds are prolific colonists of islands, where they readily evolve distinct forms. Identifying predictable, directional patterns of evolutionary change in island birds, however, has proved challenging. The "island rule" predicts that island species evolve toward intermediate sizes, but its general applicability to birds is questionable. However, convergent evolution has clearly occurred in the island bird lineages that have undergone transitions to secondary flightlessness, a process involving drastic reduction of the flight muscles and enlargement of the hindlimbs. Here, we investigated whether volant island bird populations tend to change shape in a way that converges subtly on the flightless form. We found that island bird species have evolved smaller flight muscles than their continental relatives. Furthermore, in 366 populations of Caribbean and Pacific birds, smaller flight muscles and longer legs evolved in response to increasing insularity and, strikingly, the scarcity of avian and mammalian predators. On smaller islands with fewer predators, birds exhibited shifts in investment from forelimbs to hindlimbs that were qualitatively similar to anatomical rearrangements observed in flightless birds. These findings suggest that island bird populations tend to evolve on a trajectory toward flightlessness, even if most remain volant. This pattern was consistent across nine families and four orders that vary in lifestyle, foraging behavior, flight style, and body size. These predictable shifts in avian morphology may reduce the physical capacity for escape via flight and diminish the potential for small-island taxa to diversify via dispersal.

  11. Normalización española sobre cenizas volantes (normas UNE

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    Pardo, Antonio

    1988-04-01

    Full Text Available The "Concrete Additives" task force was created within the "Concretes”/IRANOR Technical Commission-83 in 1983. It presently answers to the AENOR. Its principle objective during these years has been the elaboration of Spanish regulations concerning fly ash to be used in morters and concretes made with Portland cement. The main purpose of this study, in which a comparative analysis of international regulations is also included, is the exposition of these regulations, as well as the steps to be taken in their constant up-dating. In addition, a summary of the characteristics of fly ash produced in Spain before the elaboration of the UNE norms is also included.

    En 1983 se creó el Grupo de Trabajo "Adiciones al Hormigón" en el seno de la Comisión Técnica-83 "Hormigones”/IRANOR, actualmente transferido a AENOR. Su finalidad principal, durante estos años, ha sido la elaboración de la normativa española sobre las cenizas volantes que hayan de ser utilizadas en morteros y hormigones de cemento portland. Su exposición es el objeto principal de este trabajo, en el que se incluye también un análisis comparativo con la normativa internacional, así como los pasos a seguir en la actualización constante de las normas. Asimismo se recoge un resumen de las características de las cenizas volantes generadas en España con anterioridad a la elaboración de las Normas UNE.

  12. Synthesis of zeolites from boiler fly ash: physical, chemical and mineralogical characterization; Sintese de zeolitas a partir de cinza volante de caldeiras: caracterizacao fisica, quimica e mineralogica

    Energy Technology Data Exchange (ETDEWEB)

    Rocha Junior, C.A.F.; Santos, S.C.A.; Souza, C.A.G., E-mail: augustorocha2@gmail.com [Programa de Pos Graduacao em Engenharia Quimica (PPEQ-UFPA), Belem, PA (Brazil); Angelica, R.S.; Neves, R.F. [Programa de Pos-Graduacao em Geologia e Geoquimica, Instituto de Geociencias (PPGG-IG-UFPA), Ananindeua, PA (Brazil)

    2012-01-15

    Along the years, worldwide industrial development has causing a growing generation of residues, bringing potentials environmental problems. A study of the characteristics of these wastes, as well as the development of techniques for their use in new processes becomes indispensable for the environment preservation. The main purpose of this work is to evaluate the possible use of two important industrial residues from the Amazon region for zeolite synthesis: (a) the fly ash (particle size < 100 {mu}m) that comes from burning of mineral coal in boiler; and (b) the micro silica, a by-product of the reaction between quartz and coal in the production of metallic silicon and alloys iron-silicon.The following chemical, physical and mineralogical characterization methods were carried out: X-ray diffractometry, X-ray fluorescence, scanning electron microscopy, granulometric analysis, differential thermal and thermogravimetric analysis (DTA-TG). The analyses were carried out at the following conditions: 60, 100, 150 and 190 deg C, Na{sub 2}O/Al{sub 2}O{sub 3} molar ratio of 5 and Si/Al molar ratio ranging from 2.12 to 15, and reaction time of 24 h. The results of the fly characterization demonstrate its enormous potential as raw material for the zeolite synthesis. SiO{sub 2} and Al{sub 2}O{sub 3} represent more than 50% of its composition, mineralogical phases defined, low humidity content, low particle size (d{sub 90} < 10 {mu}m), among others. Mineralogical analyses of the synthesized products showed the formation of some zeolite types, as follow: analcime, phillipsite, sodalite, zeolite P and tobermorite. The results show that the mixture fly ash-micro silica in these reaction conditions point to a promising material for zeolite synthesis (author)

  13. Estudo da utilização de cinzas de biomassa (volantes e de fundo) na remoção de fosfatos

    OpenAIRE

    Morujo, André Filipe Viegas

    2011-01-01

    Dissertação para obtenção do Grau de Mestre em Engenharia do Ambiente, perfil Engenharia Sanitária A descarga de águas residuais tratadas com concentrações elevadas de fósforo poderá levar ao aumento da actividade dos produtores primários nas massas de água, resultando em processos de eutrofização. A eutrofização, como um processo de enriquecimento de nutrientes, conduz a alterações da qualidade da água e da estrutura e função das comunidades existentes em meios aquáticos. A presença...

  14. USO DE CENIZA VOLANTE EN LA REMOCIÓN DE CROMO (III DE LOS EFLUENTES LÍQUIDOS DE CURTIEMBRES

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    Edison Gil Pavas

    2010-10-01

    Full Text Available El presente estudio describe un método simple y económico para la remoción de cromo (III de efluentes líquidos de la industria de curtiembres utilizando ceniza volante. El proceso se llevó a cabo en forma discontinua utilizando como variables la masa de ceniza volante, el tiempo de contacto y la temperatura o el pH, Con estas variables se realizó un diseño de experimentos tipo Box-Wilson, el cual se optimizó posteriormente empleando un programa estadístico. Se utilizó una ceniza volante original y otra sometida a un tratamiento químico. Los resultados mostraron la posibilidad de bajar concentración inicial de cromo de 1850 ppm a una final de 0,008 ppm, cumpliendo así con las exigencias ambientales sobre este agente contaminante.

  15. Notícia de romances, folhetos e folhas volantes na terra de Miranda

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    António Bárbolo Alves

    2008-11-01

    Full Text Available Au Portugal la « littérature de colportage » est appelée « literatura de cordel », « folhas volantes » ou « folhetos ». Dans la région Terra de Miranda, à l'extrême nord-est du Portugal, ces livres populaires ont circulé jusqu'à la moitié du XX siècle mais, malheureusement, ils ont presque totalement disparu. Dans cet article, guidés par la mémoire et le savoir d'une conteuse, on essaiera de retrouver quelques traces de ces « folhetos » : leurs caractéristiques techniques et poétiques, les sujets les plus importants et la langue (étant donné que dans cette région on parle aussi le mirandais.

  16. Cinza vegetal na germinação e no desenvolvimento da alface

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    Marcelo Alves Terra

    2014-01-01

    Full Text Available O objetivo deste trabalho foi avaliar o efeito da cinza vegetal na germinação e no desenvolvimento da alface da variedade Lucy Brown, tipo americana. O tipo escolhido foi semeado em bandejas de isopor com cento e vinte oito células. As bandejas continham os seguintes substratos: cinza vegetal, esterco bovino, casca arroz crua, casca de arroz carbonizada, serragem, misturados com solo na proporção de 1:1, além de substrato comercial, solo com adubação de NPK e solo sem adubação. Após o início da germinação, as plântulas foram contadas de três em três dias. Mudas de alface da mesma variedade com três folhas verdadeiras foram transplantadas para caixas de leite com os mesmos substratos. Trinta e três dias após o transplante, a alface foi colhida, as folhas foram contadas, a biomassa verde e a biomassa seca foram determinadas e os caules e as raízes foram contados. O substrato que proporcionou a maior germinação foi a mistura de solo com esterco. Depois, vieram o substrato comercial, o solo com casca de arroz carbonizada, o solo puro, o solo com casca de arroz crua, o solo com NPK, o solo com serragem e o solo com cinza vegetal. Neste último, germinaram apenas de 7,83% das sementes. No momento da colheita, verificou-se, para todos os parâmetros avaliados, com exceção do peso seco da raiz, que o substrato que proporcionou o melhor desenvolvimento foi o solo com esterco bovino, que se diferenciou estatisticamente dos demais substratos avaliados. A cinza vegetal influenciou negativamente tanto na germinação quanto no desenvolvimento das plantas de alface.

  17. Non-volant mammals recorded in environmental evaluation studies in southern Brazil

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    Jorge J. Cherem

    2005-11-01

    Full Text Available Studies to evaluate environmental impacts have become both a need and a requirement of environmental agencies due to great alteration of the native environments provoked by man. Many of these studies are short-termed, but reporting the acquired data is very important in order to increase knowledge about specific biotic groups. Thus, this paper presents the results of the non-volant mammal surveys arising from seven environmental studies in southern Brazil. The following methodologies were employed: (1 interviews with local residents; (2 visual observations and recording; (3 identification of vestiges; and (4 capture with live traps. A total of 46 mammal species were recorded (5 marsupials, 4 xenarthrans, 2 primates, 13 carnivores, 2 artiodactylans, 2 lagomorphs and 18 rodents. Some species, such as the jaguar (Panthera onca, giant otter (Pteronura brasiliensis, Brazilian tapir (Tapirus terrestris and white-lipped peccary (Tayassu pecari, are possibly extinct or seriously threatened. The records obtained and the possibilities of the occurrence of other species are discussed.

  18. Effect of addition of arc furnace dust in the microstructural properties of fly ash alkali-activated; Estudo do efeito da adicao do po de aciaria nas propriedades microestruturais de matrizes a base de cinzas volantes alcali-ativadas

    Energy Technology Data Exchange (ETDEWEB)

    Vargas, Alexandre Silva de [Centro de Estudos Superiores Feevale, Novo Hamburgo, RS (Brazil); Pavao, Bruno Barreto; Masuero, Angela Boreges; Dal Molin, Denise Carpena Coitinho; Vilela, Antonio Cezar Faria [Universidade Federal do Rio Grande do Sul (UFRS), RS (Brazil)

    2010-07-01

    The search for alternative materials for construction, with less environmental impact, has been the subject of several studies. The alkali-activated cements have shown potential for the reuse of waste, and can be used in the technology of solidification/stabilization. Thus, this study aims to evaluate the main effect of adding arc furnace dust (AFD) in the microstructural properties of matrices based on fly ash alkali-activated. Three levels of AFD were studied: 0, 5, 15 and 25%. The curing was set at 70°C/24 h, and after, kept at room temperature until the age of analysis - 1, 28 and 180 days, with XRD and FTIR analysis. In the XRD spectres it was found that compounds of albite and natron decrease the intensity of their peaks in that there is an increase in the levels of AFD. Concerning to the FTIR, we observed that the band characteristic of the fly ash (FA) 1084 cm{sup -1} was shifted to bands near 1000 cm{sup -1}, which shows that the residue does not interfere in the polymerization and aluminosilicate gel formation. Therefore, under the microstructural aspect, there were no major changes that would impair the use of this residue in alkali-activated matrices. (author)

  19. Actividad hidráulica de un cemento belítico obtenido a partir de cenizas volantes tipo C: influencia del aditivo y tipo de curado

    OpenAIRE

    Goñi, S.; Guerrero, A.

    2006-01-01

    En este trabajo se discute la influencia del tipo de curado y de un aditivo reductor de la demanda de agua en la actividad hidráulica de un cemento belítico de cenizas volantes de alto contenido en cal denominado (CBCV-2-A). Este cemento ha sido sintetizado por una ruta húmeda hidrotermal con posterior calcinación, empleando ceniza volante de alto contenido en cal (ASTM tipo C) como materia prima. La actividad hidráulica se ha estudiado en la pasta de cemento, durante un periodo de 180 días, ...

  20. Actividad hidráulica de un cemento belítico obtenido a partir de cenizas volantes tipo C: influencia del aditivo y tipo de curado

    OpenAIRE

    Goñi Elizalde, Sara; Guerrero Bustos, Ana María

    2006-01-01

    En este trabajo se discute la influencia del tipo de curado y de un aditivo reductor de la demanda de agua en la actividad hidráulica de un cemento belítico de cenizas volantes de alto contenido en cal denominado (CBCV-2-A). Este cemento ha sido sintetizado por una ruta húmeda hidrotermal con posterior calcinación, empleando ceniza volante de alto contenido en cal (ASTM tipo C) como materia prima. La actividad hidráulica se ha estudiado en la pasta de cemento, durante un periodo de 180 ...

  1. Utilización de cenizas volantes y mineralizadores como materia prima en la fabricación de cemento

    Directory of Open Access Journals (Sweden)

    Palomo Sánchez, Ángel

    1983-03-01

    Full Text Available In this research the process of formation of a low energy clinker is studied, when fly-ashes (rich in sulphates and lime and fluorspar are used as raw materials (fly-ashes replaces to the tradicional raw mix partially. The availability of those fly-ashes is shown since clinker at 1.340 °C is obtained. The mineralogical composition, mineralizer capacity and temperature of formation of the new liquid phase is studied.

    En el presente trabajo se estudia el proceso de formación de un clínker de bajo consumo energético, empleando como materia prima cenizas volantes sulfocálcicas (en sustitución parcial del crudo tradicional y fluorita. Se demuestra la validez de dichas cenizas volantes, obteniendo clínker a 1.340 °C. Se estudia la composición mineralógica, capacidad de mineralización y temperatura de formación de la nueva fase líquida.

  2. Reports from dissemination and feed-back workshops with presentation of Volante results from WP1 and WP2, and response from local, regional, and national stakeholders

    DEFF Research Database (Denmark)

    Frederiksen, Pia; Vesterager, Jens Peter; Kristensen, Søren Bech Pilgaard

    2014-01-01

    The report constitutes an overview of the dissemination and feed-back workshops in the Volante case study countries: Netherlands, Romania, Austria, Greece and Denmark. The workshops were conducted based on the presentation of findings from WP1 and WP2 to national, regional and local stakeholders...

  3. Cinza de palha de cana-de-açúcar como adição mineral em fibrocimento

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    Michelle S. Rodrigues

    2013-12-01

    Full Text Available O Brasil é o maior produtor mundial de cana-de-açúcar e sua indústria sucroalcooleira gera grande quantidade de resíduos líquidos e sólidos, dentre eles a palha da cana-de-açúcar. Com o objetivo de agregar valor a este resíduo produziu-se, neste trabalho, cinza de palha de cana-de-açúcar por meio da queima controlada a 700 °C e se avaliou sua aplicação como adição mineral em compósitos de fibrocimento. A cinza foi caracterizada pelas técnicas de fluorescência de raios X, difração de raios X, granulometria a laser e superfície específica. Nos compósitos foram avaliadas as propriedades de absorção de água, porosidade aparente, massa específica aparente, módulo de ruptura, energia específica, módulo de elasticidade e limite de proporcionalidade. A caracterização das cinzas indicou superfície específica e porosidade elevadas, além de apresentar um halo de amorficidade no seu difratograma. Compósitos produzidos com as cinzas mostraram características físicas e mecânicas similares àquelas do controle o que viabiliza a substituição parcial do cimento Portland por esse tipo de cinzas.

  4. Estudo de argamassas adicionadas de cinzas de algaroba geradas no arranjo produtivo local de confecções do agreste pernambucano

    OpenAIRE

    Melo, Marcio Couceiro Saraiva de

    2012-01-01

    Esse trabalho avaliou a incorporação em argamassas de revestimento de cinzas de topo e cinzas de base, provenientes da queima de lenha de Algaroba nas lavanderias do arranjo produtivo local (APL) de confecções da região agreste pernambucano-Brasil. As cinzas foram coletadas em uma lavanderia de médio porte representativa da região, peneiradas em malha 200, avaliadas quanto as suas características físico-químicas e adicionadas em argamassa do tipo emboço, com traço 1:2:9 (cim...

  5. Le sauvetage des juifs au Chambon-sur-Lignon à travers Les Cerfs-volants de Romain Gary

    OpenAIRE

    Letourneau, Ingrid

    2018-01-01

    Dans Les Cerfs-volants (1980) Romain Gary relate la jeunesse résistante de Ludo à Cléry, un village normand inventé par l'auteur. Au sein de cette fiction, Gary, lui‑même ancien résistant aux racines juives, cite à plusieurs reprises le nom du Chambon‑sur‑Lignon, village connu pour avoir sauvé des réfugiés juifs durant la Seconde Guerre mondiale. L'hommage de Gary adopte ainsi le ton de la pudeur. Surtout, la mémoire du village se déploie à travers le personnage d'Ambroise Fleury, dont certai...

  6. Non-volant mammals from the Upper Paraná River Basin: a data set from a critical region for conservation in Brazil.

    Science.gov (United States)

    Gonçalves, Fernando; Hannibal, Wellington; Godoi, Mauricio N; Martins, Fernando I; Oliveira, Roniel F; Figueiredo, Valquiria V; Casella, Janaina; de Sá, Érica F G G

    2018-02-01

    The data set represents the first attempt at a large-scale inventory of non-volant mammals, with potential applications to performing macroecological studies, developing conservation strategies, and undertaking population and community ecology research, but also to evaluate the ecological consequences of fragmentation and defaunation. Our objectives for compiling these data were to summarize information about inventories of non-volant mammals in the critically important area of the Upper Paraná River Basin by focusing on species richness and index of frequency of occurrence and to identify gaps in knowledge regarding non-volant mammal communities in order to guide future sampling efforts. The data set comprises studies on communities of non-volant mammals from 52 locations covering more than 1,000 km 2 and comprises portion of four Brazilian states in the Upper Paraná River Basin. We listed 81 species of non-volant mammals distributed among 58 genera, 22 families, and 9 orders. Rodentia (28 species) was the richest order, followed by Carnivora (17 spp.) and Didelphimorphia (15 spp.). The richest family was Cricetidae (20 spp.), followed by Didelphidae (15 spp.), and Dasypodidae and Felidae (six spp.). Considering national conservation status, one species are considered endangered and 16 vulnerable. Considering global conservation status, 7 species are considered vulnerable, 10 are considered near threatened, and 6 are data deficient. According to the index of frequency of occurrence, Myrmecophaga tridactyla was the most frequent species, occurring at 88.64% of all sites, while 25 species were considered very restricted, occurring in just 2.56% of all sites. In general, the non-volant mammal fauna was composed of mainly very restricted (VR, 25 species) and localized species (L, 25 species), which account for 61.7% of the known species, while 38.3% are restricted (R, 8 species), common (C, 16 species), and widespread (W, 7 species). Seven marsupials and five

  7. Avaliação de pastas de cimento Portland contendo cinza pesada moída

    OpenAIRE

    Pilar, Ronaldo; Schankoski, Rudiele Aparecida; Moro, Agostinho João Dal; Repette, Wellington Longuini

    2016-01-01

    Neste trabalho avalia-se a influência da incorporação de cinza pesada moída, obtida da combustão de carvão mineral, em pastas de cimento Portland. A cinza pesada foi incorporada as pastas de cimento em três distribuições granulométricas distintas e dosadas para teores de substituição ao cimento, em volume, de 10%, 30% e 50%. As pastas foram dosadas com duas relações água/aglomerante, em massa, de 0,35 e 0,40. As primeiras idades foram investigadas por calorimetria isotérmica. Após passarem po...

  8. Desinfecção de água cinza por fotocatálise heterogênea

    OpenAIRE

    Anderson Teodoro; Marc Árpad Boncz; Paula Loureiro Paulo; Amilcar Machulek Junior

    2017-01-01

    RESUMO A desinfecção adequada de águas cinzas é necessária para garantir a segurança de sua reutilização, principalmente em aplicações com potencial de exposição humana. Diversos processos oxidativos avançados têm sido empregados nos últimos anos para a degradação de contaminantes orgânicos, bem como para desinfecção de águas e efluentes. O objetivo deste trabalho foi testar TiO2 suportado em microtubos para desinfetar águas cinzas por meio da fotocatálise heterogênea, visando ao reúso hídric...

  9. Non-volant mammals in a protected area on the Central Andes of Colombia: new records for the Caldas department and the Chinchiná River basin

    OpenAIRE

    Ramírez-Mejía, Andrés; Sánchez, Francisco

    2015-01-01

    The Chinchiná River basin is located on the western slope of the Colombian Central Andes. This basin provides ecosystem services such as water provision for >500,000 people, but has suffered considerable ecosystem degradation, and the information on its biodiversity is limited. We inventoried the non-volant mammals in the Caldas' Central Hydroelectric (CHEC) Reserve in the Chinchiná River basin, in the Caldas department. We detected 18 species of mammals, present the first record of Puma ya...

  10. O que restou de tudo isso? Signos da arte e da memória em 'Cinzas do Norte'

    Directory of Open Access Journals (Sweden)

    Julio Pimentel Pinto

    2016-10-01

    Full Text Available O texto identifica a construção de três perfis distintos de artistas no romance Cinzas do Norte, de Milton Hatoum, e, por meio deles, reflete sobre a relação entre ficção e história, sobre a evocação do passado, o trabalho da memória e os sentidos da arte.

  11. A devastação ecológica em cinzas do norte de Milton Hatoum

    Directory of Open Access Journals (Sweden)

    Marcos Reigota

    2014-12-01

    Full Text Available Este artigo procura relacionar Cinzas do Norte, de Milton Hatoum, com o pensamento ecologista de Félix Guattari e Ana Godoy. Cinzas do Norte é uma narrativa sobre dois amigos de Manaus, cuja amizade se inicia em 1964, numa escola pública, e que segue até o final da ditadura civil-militar. Procuramos situar a obra de Milton Hatoum em relação à ecocrítica, em textos de autoria de Félix Guattari e Ana Godoy, e observar como a obra de Milton Hatoum colabora com a proposta de educação ambiental como produtora de sentidos. Afirmamos que a literatura, e particularmente Cinzas do Norte, contribui para a ampliação do repertório das práticas sociais e pedagógicas ecologistas no cotidiano. Trata-se de artigo resultante de pesquisa apoiada pelo CNPq sobre a obra de Milton Hatoum e suas relações com a educação ambiental pós-moderna e com os estudos culturais (ecocrítica.

  12. Efecto del proceso de fusión y envejecimiento en la síntesis de zeotipos a partir de cenizas volantes

    Directory of Open Access Journals (Sweden)

    Jeimer Alexander Lizcano-Cabeza

    2015-01-01

    Full Text Available En este estudio, se evalúa el uso de una muestra de cenizas volantes de TERMOPAIPA (Boyacá, Colombia como material de partida para la síntesis de zeotipos a escala de laboratorio a través de su transformación por fusión alcalina, utilizando NaOH sólido o disuelto en agua, seguida por envejecimiento durante 6, 12 y 24 h en condiciones estáticas o de ultrasonido previo al tratamiento hidrotérmico durante 6, 12 y 24 h de reacción. Los datos experimentales revelan que el método, el estado de fusión alcalina, la temperatura y el tiempo de reacción afectan fuertemente el zeotipo a ser sintetizado. Se sintetizaron zeotipos sódicos bajos en sílice, los cuales incluyen zeolita NaP1, faujasita, y trazas de sodalita. La síntesis de zeotipos a partir de cenizas volantes representa una interesante alternativa para la mitigación del problema ambiental, asociado a la disposición de residuos industriales. Por lo tanto, los zeotipos a base de cenizas volantes sintetizados bajo óptimas condiciones experimentales pueden ser utilizados en diversas aplicaciones para el tratamiento ambiental de residuos.

  13. ESTUDO DA MICROESTRUTURA DO CONCRETO COM ADIÇÃO DE CINZA DE CASCA DE ARROZ RESIDUAL SEM BENEFICIAMENTO

    OpenAIRE

    Marcelo Adriano Duart

    2008-01-01

    O uso de adições minerais em concretos é um tema bastante estudado por vários pesquisadores que buscam características como: redução do consumo de cimento para redução de custos, aumento da durabilidade, aumento da resistência mecânica e aproveitamento de resíduos industriais para redução da poluição ambiental. Este estudo pretende analisar a microestrutura dos concretos dosados com adição de cinza de casca de arroz residual sem controle de queima e sem moagem (CCAN), em substitui...

  14. Síntesis de zeolitas a partir de cenizas volantes de centrales termoeléctricas de carbón

    OpenAIRE

    Umaña Peña, Juan Carlos

    2002-01-01

    Los sub-productos de combustión del carbón producidos en centrales térmicas, están compuestos generalmente por más de un 70% de material vítreo aluminosilicatado. Esta composición los hace potencialmente utilizables en obras de ingeniería civil o alternativamente como rellenos inertes en minería, así como adsorbentes, inmovilizadores, fuente alternativa en la extracción de Al, Fe, Si, Ge, Ga, V y Ni, y aditivos en suelos.Las cenizas volantes se caracterizan por una distribución granulométrica...

  15. Utilización de ceniza volante y catalizador fcc gastado en la recuperación de cromo (iii) de los efluentes líquidos de las curtiembres

    OpenAIRE

    Amaya, Jeceny; Tristancho, Andrés; Sánchez Castellanos, Francisco José

    2010-01-01

    El presente trabajo estudia la posibilidad de utilizar dos desechos sólidos industriales: la ceniza volante de TERMOPAIPA y el catalizador de equilibrio gastado (FCC) de ECOPETROL, en la remoción y recuperación de cromo de los efluentes líquidos de las curtiembres. La ceniza volante se sometió a dos tratamientos hidrotérmicos alcalinos para obtener estructuras zeolíticas de mejores propiedades, y el catalizador gastado se calcinó para eliminar el coque de su superficie. La caracterización de ...

  16. Efeito da cinza de biomassa na dinâmica do C e N do solo de uma plantação de pinus pinaster Wood ash effects on C and N dynamics of a soil from a pinus pinaster plantation

    Directory of Open Access Journals (Sweden)

    Maria Xesús Gómez-Rey

    2010-12-01

    Full Text Available Estudou-se, através de incubação aeróbia, o efeito da aplicação de cinza de biomassa florestal nas características químicas e na actividade microbiana de um Arenossolo de um povoamento de Pinus pinaster Ait. As doses de cinza aplicadas foram de 0, 4, e 8 g kg-1 solo, sob forma pulverulenta ou peletizada, e na presença ou ausência de fertilizante azotado. A aplicação de cinza sob forma pulverulenta aumentou rápida e significativamente os valores de pH e os teores de bases de troca e de P extraível do solo. A nitrificação líquida foi igualmente estimulada. A quantidade de C microbiano nos solos com cinza pulverulenta foi inferior ao controlo, não sendo observados efeitos significativos para a respiração basal do solo. O quociente metabólico foi superior na fase inicial da incubação. Os efeitos observados foram, em geral, tanto mais intensos quanto maior a dose de cinza aplicada e mais acentuados na presença de N. A cinza aplicada sob forma peletizada não produziu um efeito tão acentuado nas características do solo nem na elevação da alcalinidade, determinando uma fraca influência na dinâmica de C e na produção de nitrato. Em sistemas como o estudado a aplicação de cinza sob forma peletizada é preferível, ao originar um efeito mais prolongado da sua acção, devendo ser acompanhada de fertilizantes azotados para aumentar a disponibilidade de N no solo.Effects of wood ash (loose and pelleted on chemical properties and microbial activity in an Arenosol from a Pinus pinaster plantation were assessed through laboratory incubation. Wood ash was applied at a rate of 0, 4 and 8 g kg-1 soil both alone or together with N. Loose ash significantly increased pH values and extractable nutrients from the soil. Net nitrification was stimulated by it application. Amounts of microbial biomass C were lower in soils with loose ash than in the control. Basal respiration was not affected by treatments. Effects increased with the

  17. Rastros de memória e fagulhas da criação em Cinzas do Norte

    Directory of Open Access Journals (Sweden)

    Roniere Silva Menezes

    2016-12-01

    Full Text Available O presente trabalho objetiva investigar o emprego do conceito de memória no processo criativo do romance Cinzas do Norte, de Milton Hatoum. São estabelecidas relações entre a vida do autor e a sua obra, a partir do conceito de “biografema” estabelecido por Roland Barthes. Relações entre vivência, memória, esquecimento e invenção serão abordadas, assim como diálogos entre literatura, memória, corpo e História contemporânea do Brasil. A estrutura do enredo de Cinzas do Norte reflete a perspectiva de trabalhos fragmentários com a memória. A mescla entre cartas, relatos e foco narrativo reconfiguram modalidades mais tradicionais do gênero memorialístico. Todavia, o discurso ainda se prende a um posicionamento ligado, em última instância, à voz do narrador, responsável este por reorganizar os diversos textos e gêneros que se alternam no livro. 

  18. Desinfecção de água cinza por fotocatálise heterogênea

    Directory of Open Access Journals (Sweden)

    Anderson Teodoro

    2017-07-01

    Full Text Available RESUMO A desinfecção adequada de águas cinzas é necessária para garantir a segurança de sua reutilização, principalmente em aplicações com potencial de exposição humana. Diversos processos oxidativos avançados têm sido empregados nos últimos anos para a degradação de contaminantes orgânicos, bem como para desinfecção de águas e efluentes. O objetivo deste trabalho foi testar TiO2 suportado em microtubos para desinfetar águas cinzas por meio da fotocatálise heterogênea, visando ao reúso hídrico em bacia sanitária. A água cinza utilizada nos experimentos foi coletada após passar por um sistema de tratamento composto de um tanque de evapotranspiração seguido de banhado construído de fluxo horizontal. Foram realizados testes em batelada utilizando-se um reator fotoquímico cilíndrico de 1,0 L (volume total do reator, preenchido com pequenos cilindros de vidro do tipo Pyrex com TiO2 suportado. Para os testes de desinfecção, foram utilizados os processos UV, H2O2, UV/TiO2, UV/H2O2 e UV/TiO2/H2O2. Foi possível obter uma camada homogênea de TiO2 depositada nos pequenos tubos de vidro Pyrex, com espessura média de 35,3 µm, capaz de promover um incremento na desinfecção de águas cinzas. Porém, mesmo com um maior poder de desinfecção do TiO2 - se comparado com a fotólise (UV -, os processos em que se empregou o peróxido de hidrogênio foram bem mais eficientes, tanto na desinfecção (inativação total de coliformes totais, enterococos e Pseudomonas aeruginosa quanto na remoção de matéria orgânica em termos de demanda química de oxigênio (em torno de 60%. As amostras mantidas em temperatura ambiente e envolvidas por plástico escuro não apresentaram recrescimento bacteriano com 24h de armazenamento após os experimentos, mostrando assim a viabilidade da água cinza tratada em reúso doméstico.

  19. Crescimento, produção e qualidade de frutos da bananeira 'Figo cinza', em Botucatu-SP Growth, yield and quality of 'Figo cinza' banana fruits in Botucatu-SP

    Directory of Open Access Journals (Sweden)

    Dayana Portes Ramos

    2009-09-01

    Full Text Available A bananeira Figo Cinza é uma cultivar do grupo ABB, subgrupo Figo, que apresenta tolerância ao mal-do-panamá e às sigatokas amarela e negra, demonstrando ser uma cultivar interessante para programas de melhoramento genético. Devido a isso, o presente trabalho teve como objetivo avaliar características do 1º ciclo da planta, como o crescimento, produção e atributos físico-químicos dos frutos dessa cultivar, no município de Botucatu-SP. Foram avaliadas as seguintes características de crescimento: altura de plantas, circunferência do pseudocaule e número de folhas, medidas na época de emissão da inflorescência; número de dias entre o plantio e o florescimento, número de dias entre o florescimento e a colheita, e número de dias do plantio à colheita. Também foram mensuradas as seguintes características de produção: peso do cacho, número de frutos, peso médio dos frutos, número de pencas e produtividade; na 2ª penca foram avaliados peso, número, comprimento e diâmetro dos frutos. Os atributos fisico-químicos analisados foram: textura, pH, acidez titulável, sólidos solúveis, açúcares totais, amido e teor de potássio. Foi utilizado o método das estatísticas descritivas para a caracterização da cultivar, através dos cálculos das médias. Os resultados mostraram que 'Figo Cinza' apresentou porte médio (2,9 m, ciclo de 420 dias, produtividade média de 12,74 t ha -1 e frutos com baixa acidez (0,06%.'Figo Cinza' is a cultivar of the genomic group ABB, Figo subgroup, which provides tolerance to Panama and Sigatoka diseases that may be useful in genetic breeding programs. Then, this work aimed to evaluate the plants growth, production and also the physical and chemical characteristics of the fruits from this cultivar in Botucatu city, São Paulo state, Brazil. Some growth characteristics were evaluated such as: plant height, the pseudostem circumference, number of leaves, number of days between planting and

  20. Diversidade e capacidade simbiótica de rizóbios isolados de nódulos de Mucuna-Cinza e Mucuna-Anã

    Directory of Open Access Journals (Sweden)

    Andréa Aparecida de Lima

    2012-04-01

    Full Text Available As espécies de mucuna são muito utilizadas como adubos verdes, e poucas informações estão disponíveis a respeito dos rizóbios nativos capazes de nodulá-las. O objetivo deste trabalho foi avaliar a diversidade e a capacidade simbiótica de isolados bacterianos de nódulos de mucuna-cinza (Mucuna pruriens (L. DC. e mucuna-anã (Mucuna deeringiana (Bort. Merr.. As bactérias foram isoladas de nódulos de mucunas cinza e anã cultivadas em vasos com solos de um sistema de produção agroecológica. Foram isoladas 160 bactérias, sendo 80 de mucuna-anã e 80 de mucuna-cinza, que foram autenticadas e selecionadas para avaliação da capacidade simbiótica. A diversidade dos isolados foi avaliada por meio das características culturais em meio de cultura YMA e da técnica de análise de restrição do produto de PCR do gene 16S rDNA. A inoculação de cinco isolados em mucuna-cinza e dois em mucuna-anã apresentou elevada biomassa da parte aérea. A maioria dos isolados apresentou crescimento rápido e acidificou o meio de cultura. A análise de restrição demonstrou que as bactérias isoladas apresentam baixa similaridade com estirpes de referência, sugerindo a existência de isolados pertencentes a novos grupos, capazes de nodular as mucunas anã e cinza.

  1. Cinza da lenha para aplicação em cerâmica vermelha. parte I: características da cinza Firewood ash for application in red ceramic. part I: characteristics of the ash

    Directory of Open Access Journals (Sweden)

    M. C. Borlini

    2005-09-01

    Full Text Available A lenha de eucalipto constitui-se no principal combustível utilizado pelas indústrias de cerâmica vermelha do município de Campos dos Goytacazes, Estado do Rio de Janeiro. Em princípio, esta lenha tem características promissoras para adição em cerâmica. Assim, esse trabalho tem por objetivo caracterizar a cinza proveniente da combustão de lenha predominantemente de eucalipto visando a incorporação na massa de cerâmica vermelha processada em indústrias de Campos dos Goytacazes. Foram realizados ensaios de fluorescência de raios X, difração de raios X, distribuição de tamanho de partícula, análise térmica (ATD/TG, porosimetria de mercúrio e microscopia eletrônica de varredura. Os resultados mostraram que a cinza da lenha se apresenta como aglomerados de partículas, sendo constituída principalmente por Ca, Si, Mg, K e S.The eucalyptus firewood is one of the main fuels used by the industries of red ceramic in the municipal area of Campos of Goytacazes, State of Rio de Janeiro. In principle this firewood has promising characteristics for addition into ceramics. Thus, the present work has for objective to characterize the ash generated from burning firewood aiming at its incorporation into red ceramic products. The ash was submitted to X-ray diffraction, chemical composition, particle size distribution, thermal analysis (ATD/TG, mercury porosimetry and scanning electron microscopy tests. The results showed that the ash of the firewood comes as agglomerates of particles, being constituted mainly by Ca, Si, Mg, K and S.

  2. CARACTERIZAÇÃO E TRATAMENTO DE ÁGUAS CINZAS VISANDO REÚSO DOMÉSTICO

    OpenAIRE

    Geraldo Rampelotto

    2014-01-01

    A produção e disseminação do conhecimento para as questões ambientais, considerando os aspectos sociais e econômicos, entre eles, o reúso de águas, aplicado para fins não potáveis vem ao encontro das premissas de planeta sustentável. As águas cinzas, quando devidamente tratadas, podem ser utilizadas para consumo não potável em edificações como, por exemplo, descarga de vasos sanitários, lavagem de pisos, lavagem de calçadas, irrigação de jardins, usos ornamentais como espelhos dágua e chafari...

  3. Caracterização e aproveitamento de água cinza para uso não-potável em edificações

    OpenAIRE

    Bazzarella, Bianca Barcellos

    2005-01-01

    Uma das formas de se conservar água nas residências é utilizando fontes alternativas de suprimento. O reúso de águas cinza para fins não-potáveis, tais como lavagem de veículos, rega de jardins e descarga de vasos sanitários, é apenas um exemplo. Este trabalho tem como objetivo pesquisar alternativas para redução do consumo de água potável e da produção de esgotos sanitários em edificações, a partir do aproveitamento do tratamento e reúso de águas cinza em descargas de vasos sanitários. Pa...

  4. Estudo da influência da adição de cinzas de carvão mineral nas propriedades da cerâmica vermelha

    OpenAIRE

    Zanin,T. L.; Klitzke,W.; Luz Jr.,L. F. L.

    2013-01-01

    A adição de resíduos industriais em cerâmicas vermelhas tem sido o alvo de diversos estudos, onde se busca uma destinação final adequada ao resíduo e melhoria das características da cerâmica. Neste trabalho, avaliou-se a adição de cinzas leves de carvão mineral oriundas de uma usina termelétrica existente em Figueira, PR. Foram preparadas misturas de 0, 10, 20, 30, 40 e 50% de cinzas em argila e produzidos corpos de prova de 6 cm x 2 cm x 0,5 cm por calcinação a 950 ºC. Avaliou-se os parâmetr...

  5. Síntese de zeólitas a partir de cinzas de carvão e aplicação como adsorventes

    OpenAIRE

    Barbara Potrich Zen

    2016-01-01

    Cinzas oriundas da combustão de carvão são resíduos produzidos no processo de geração de energia em termoelétricas. Esses resíduos industriais podem ser aproveitados como matéria prima para síntese de zeólitas, as quais são materiais aluminossilicatos porosos com importantes aplicações, como adsorventes no tratamento de efluentes líquidos. Nesse contexto, o objetivo deste trabalho foi sintetizar zeólitas a partir de três diferentes cinzas de carvão e utilizá-las na remoção de corante violeta ...

  6. Caracterização, tratamento e reúso de águas cinzas e aproveitamento de águas pluviais em edificações.

    OpenAIRE

    Simone May

    2009-01-01

    não potáveis vêm ao encontro das premissas de sustentabilidade e ao conceito de conservação de água. Sistemas de reúso de águas cinzas e sistemas de coleta e aproveitamento de águas pluviais devem seguir quatro critérios: segurança higiênica, estética, proteção ambiental e viabilidade técnica e econômica. As águas cinzas e as águas pluviais devidamente tratadas podem ser utilizadas no consumo não-potável em edificações como em bacias sanitárias, em torneiras de jardins, na irrigação de gramad...

  7. A fly-wheel drive with controlled-torque clutch for a reactors cooling circuit pumps; Entrainement des pompes du circuit de refrigeration d'un reacteur par volant a embrayage sous couple controle

    Energy Technology Data Exchange (ETDEWEB)

    Riettini, A [Commissariat a l' Energie Atomique, Grenoble (France). Centre d' Etudes Nucleaires

    1964-10-15

    After a theoretical study on the slowing down of a centrifugal pump, the motion equations have been checked by means of experimental tests. In order to have important slowing down times (which is the case of the cooling pumps of a research reactor) it is necessary to add a fly-wheel. To prevent troubles when starting, a block pump-fly-wheel with clutch under controlled torque was developed. It is so possible to start the fly-wheel progressively without increasing too much power of the driving motor. (author) [French] Apres une etude theorique sur le mouvement de ralentissement d'une pompe centrifuge, les equations du mouvement ont ete verifiees par des essais pratiques. Pour obtenir des temps de ralentissement importants (cas des pompes de refrigeration d'un reacteur de recherche) il est necessaire d'y adjoindre un volant d'inertie. Pour eviter les inconvenients au demarrage, on a etudie un ensemble pompe-volant avec embrayage sous couple controle. Cette solution permet de lancer progressivement le volant sans augmentation appreciable de la puissance du moteur d'entrainement. (auteur)

  8. Desenvolvimento do feijão caupi (vigna unguiculata l.walp utilizando as cinzas de bagaço da cana-de-açúcar e efluente tratado

    Directory of Open Access Journals (Sweden)

    José Airlys Garcia de Menezes

    2013-09-01

    Full Text Available A grande quantidade de cinzas gerada pelos engenhos, proveniente da queima do bagaço da cana-de-açúcar, ou seja, a necessidade de redução de emissões advindas dessa queima, fazem com que se busquem alternativas para diminuir essas emissões, assim como para a utilização racional dessas cinzas em diversas culturas, como na produção do feijão caupi.O presente trabalho teve como objetivo avaliar os efeitos das cinzas de bagaço de cana-de-açúcar com efluente tratados, no desenvolvimento inicial da cultura do Feijão caupi (Vigna unguiculata L.Walp. O estudo foi desenvolvido na estação de tratamento de esgoto da Faculdade de Tecnologia CENTEC – FATEC Cariri, utilizando-se de tratamentos T1- Efluente tratado do filtro anaeróbio juntamente com as cinzas do bagaço da cana-de-açúcar; T2- Água proveniente de poço juntamente com as cinzas do bagaço da cana-de-açúcar; T3- Água proveniente de poço sem aplicação de cinzas; com três épocas de coletas, compondo um modelo de experimento inteiramente casualizado. Contudo os valores de altura e o diâmetro caulinar foram mais elevados nas plantas cultivadas com a aplicação das cinzas de bagaço de cana-de-açúcar com efluente tratados. Normal 0 21 false false false PT-BR X-NONE X-NONE

  9. Studies of physical behavior, and mechanical rheological mortar and settlement with addition of coating waste of civil construction and fly ashes; Estudos do comportamento fisico, mecanico e reologico de argamassa de assentamento e revestimento com adicao de rejeito de construcao civil e cinzas volantes

    Energy Technology Data Exchange (ETDEWEB)

    Ferreira, K.C.; Cardoso, D.N.P.; Souza, J.A. da S.; Felipe, A.M.P.F., E-mail: keyllafcastro@yahoo.com.br [Universidade Federal do Para (UFPA), PA (Brazil)

    2014-07-01

    The use of fly ash generated from the combustion of coal in fluidized bed boilers, is being used in construction in partial replacement of Portland cement, due to their pozzolanic activities, thus minimizing the accumulation of such industrial waste generated. We studied the physical, chemical and rheological six mortars in different proportions of cement, construction waste (RCC) and fly ash (CV). For the rheological torque versus time was used viscometer model VT 550, at a temperature of 28 ° C with constant rate 53.4 s-1. Analyses particle size, X-ray diffraction, X-ray fluorescence and physico-mechanical absorption, porosity, apparent specific gravity and compressive strength. The composition 2 RCC with 90% and 5% CV results showed better resistance and workability. The results revealed an interesting mix in the production of mortars for the construction industry thus minimizing the impacts generated by these wastes. (author)

  10. Production of fly ash-based geopolymers using activator solutions with different Na{sub 2}O and Na{sub 2}SiO{sub 3} compositions; Producao de geopolimeros a base de cinza volante usando solucoes ativadoras com diferentes composicoes de Na{sub 2}O e Na{sub 2}SiO{sub 3}

    Energy Technology Data Exchange (ETDEWEB)

    Azevedo, A.G. de S.; Strecker, K.; Araujo Junior, A.G. de; Silva, C.A. da [Universidade Federal de Sao Joao del-Rei (UFSJ), MG (Brazil)

    2017-04-15

    Geopolymers are a new class of binder with high mechanical strength, chemical inertia and can be made of by-products. In this work fly ash from a Brazilian power station was used to produce the geopolymer cement. To produce the geopolymers, different activator solutions were used in order to study the influence of the chemical composition of these solutions on the production of the fly ash-based geopolymers. The results showed that the Brazilian fly ash has the potential to be used in the geopolymerization process. The specimens presented high compression strength, 28 MPa after 24 h and 48 MPa after 28 days of cure. The X-ray diffraction of the original fly ash and the geopolymers samples exhibited some mineral phases presents in the fly ash and new zeolitic phases formed after the geopolymerization process. The infrared spectroscopic of all samples showed some modifications of absorption bands besides new bands corresponding to the geopolymerization process. The physical properties, such as the water absorption, porosity and permeability, changed when the activator solution changed and the curing time was modified. (author)

  11. Efeito da adição de Na2O na viscosidade e devitrificação do vidro obtido a partir de cinzas volantes e Li2O Influence of Na2O on the viscosity and devitrification behavior of glasses obtained from fly ashes and Li2O

    Directory of Open Access Journals (Sweden)

    Etney Neves

    1998-07-01

    Full Text Available Glass-ceramic materials can be produced by the addition of LiO2 to fly ashes disposible in Southern Brazil. These glass-ceramics are based on the Al2O3-SiO2-Li 2O system. The high viscosity of the obtained glasses, however, makes forming useful articles with these materials difficult. In this study we investigate the effect of adding low cost Na2CO3 on the melt viscosity and on the nature of the developed crystalline phases. It was intended that the ultimate crystalline phase (LiAlSi3O8 should not be altered. With additions up to 3 wt. % Na2CO3, the viscosity was apparently lowered and no new crystalline phase were detected.

  12. Análise da durabilidade do concreto de alto desempenho com adição de cinza de casca de arroz e borracha de pneu

    Directory of Open Access Journals (Sweden)

    Antonio Rogério Brizante de Vasconcelos

    Full Text Available Desde a década de 70 o Brasil vem apresentando uma crescente degradação nas suas estruturas de concreto armado. Por esta razão, inúmeras pesquisas relacionadas à durabilidade destas estruturas têm sido realizadas, visando a contribuir com a qualidade e com a redução dos custos com manutenção e reparos. Este trabalho avaliou o comportamento da durabilidade do concreto de alto desempenho com adições, substituindo parte de cimento e agregados presentes no concreto pela cinza da casca de arroz e borracha de pneu respectivamente. Foram realizados ensaios de durabilidade submetendo o concreto a diversos processos de degradação, como a ação da água, temperatura, sais e solução ácida. O estudo indicou que a durabilidade não foi comprometida com adição de sílica ativa ou cinza da casca de arroz, com a adição de borracha de pneu. De fato, a borracha mostrou-se muito eficaz no combate a ação de agentes químicos, a altas temperaturas e à entrada de água. Com a cinza da casca de arroz, apesar do maior diâmetro de suas partículas, conseguiu-se resultados similares em relação à sílica ativa.

  13. Unidades de produção agrícola controlada no semiárido para o tratamento de água cinza

    Directory of Open Access Journals (Sweden)

    Aline Costa Ferreira

    2013-10-01

    Full Text Available As reservas de água doce, juntamente com as limitações de lançamento de efluentes no meio ambiente, culminam para a necessidade do uso racional dos recursos hídricos de modo a reduzir os impactos negativos da geração de efluentes. Nesse contexto, o trabalho foi realizado objetivando-se implantar e monitorar eficiência do tratamento da água, para o semiárido, de unidades de produção agrícola controladas UPAC’s utilizando as águas cinzas de uma lavanderia comunitária.  A pesquisa foi desenvolvida nas instalações da Lavanderia Pública do Distrito de Ribeira no município de Cabaceiras no Estado da Paraíba. Foram implantadas oito unidades de produção agrícola controlada e os parâmetros analisados das águas cinza coletadas dos pontos de observação das unidades foram: Condutividade Elétrica (CE, pH, e Oxigênio Dissolvido (OD.  No sistema foram plantadas duas culturas com destinação à alimentação animal as quais são a mucuna-preta (Mucuna pruriens (L. e o capim elefante (Pennisetum purpureum e uma para consumo humano, o maracujá (Passiflora sp. O tratamento das águas cinzas nas Unidades de Produção Agrícola Controladas promoveu uma diminuição da CE, pH e OD das águas oriundas da lavanderia, tornando uma alternativa viável e sustentável para o tratamento de água de lavanderias como também para produzir alimentos para fins animais e humanos.

  14. Eficiência na remoção de coliformes em águas cinza através da fitorremediação

    Directory of Open Access Journals (Sweden)

    Verena S. Baracuhy

    2015-03-01

    Full Text Available O semiárido é caracterizado pelas irregularidades pluviais e o tratamento de águas cinza para reuso na agricultura com tecnologia ecológica é uma forma de conviver com a seca nessas regiões. Nesse contexto, a pesquisa foi realizada no distrito de Ribeira no município de Cabaceiras/PB objetivando-se avaliar a eficiência da remoção dos coliformes totais e fecais do efluente tratado nas unidades de produção agrícola através da fitorremediação. Foram realizados dois tratamentos com e sem fitorremediação, a cultura utilizada foi o capim roxo. As águas cinza eram provenientes de uma lavanderia pública. Foram coletadas amostras mensais e analisadas os coliformes total e fecal (Escherichia coli. No tratamento sem fitorremediação, os coliformes totais variaram de 1,583 x 103 a 2,0224 x 103 (UFC/100 mL e quando o tratamento tinha o auxílio do capim roxo, ou seja, com fitorremediação os coliformes totais oscilaram de 1,354 x 103 a 2,0224 x 103 (UFC/100 mL. Ocorreu uma redução significativa de Escherichia coli no tratamento com fitorremediação. A utilização da fitorremediação no tratamento de águas cinza reduziu a presença de coliformes totais e fecal, sendo assim uma alternativa viável de tratamento, proporcionando um aumento da qualidade hídrica.

  15. Obtenção de cermet por tecnologia do pó a partir da utilização da cinza leve proveniente da queima do carvão mineral em termoelétrica

    OpenAIRE

    Andréia Brogni

    2013-01-01

    Este trabalho busca produzir cermet (Cinza-Fe) pela tecnologia do pó utilizando cinza leve produzida com a queima do carvão mineral em termoelétrica para uma possível utilização e aplicação na usinagem. Esse estudo tem como objetivo específico caracterizar e analisar as propriedades mecânicas e metalúrgicas das amostras obtidas a partir das misturas. Utilizouse o ferro como componente da mistura em função do baixo custo e vasta disponibilidade. Após a obtenção da cinza leve, determinou-se o t...

  16. Wetlands construídos empregados no tratamento descentralizado de águas cinzas residencial e de escritório

    OpenAIRE

    Monteiro, Victória Regina Celso

    2014-01-01

    Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Ambiental, Florianópolis, 2014. Dentre as tecnologias de saneamento descentralizado mais utilizadas para o tratamento de águas cinzas (AC), destacam-se os wetlands construídos. Este trabalho tem como objetivo geral avaliar o comportamento de wetlands construídos de fluxo horizontal (WH) e vertical (WV) empregados no tratamento de AC residencial e de escritório, respe...

  17. El desarrollo de las características mecánicas del hormigón fabricado con adiciones de cenizas volantes bajo varias condiciones de curado

    Directory of Open Access Journals (Sweden)

    Abdul HUssain, Munther Latif

    1994-02-01

    Full Text Available In this research, me have made an experimental analysis of the development of the mechanical characteristics of concretes made with different percentages of fly ashes substituting Portland Cement and in different curing conditions. It is often not enough to know the evolution of the compressive strength in order to detect and solve our problems. It is very important to know the development of other mechanical properties of concrete, especially at early stages, in order to determine with certainty the time the construction will take, as well as the construction process, i.e. tensile strength. Young's modulus and bond strength. Furthermore, at early stages, the curing conditions are very important for the development of these mechanical properties. Besides, the partial replacement of the cement by fly ashes has an additional influence on that development. We have studied these parameters by testing different types of concretes, with 20, 35 and 50 per cent F class (ASTM fly ashes replacing cement, cured at 10ºC, 20ºC and 30ºC with 60 and 100 per cent relative humidity. The test stages were 7, 28 and 90 days and all four properties were measured. This paper presents various tables and figures with the test results which can be of use in the design of construction processes and some additional conclusions on the developments obtained.

    En esta investigación se analiza, experimentalmente, el desarrollo de las características mecánicas de hormigones fabricados con diferentes porcentajes de sustitución del cemento portland por cenizas volantes y sometidos a la influencia de diversas condiciones de curado. Muchas veces el conocimiento de la evolución de la resistencia a compresión del hormigón no es suficiente para detectar y resolver nuestros problemas. Conocer el desarrollo de otras características mecánicas del hormigón, especialmente a edades tempranas, es fundamental para establecer con seguridad el plazo de construcci

  18. Novel Babesia and Hepatozoon agents infecting non-volant small mammals in the Brazilian Pantanal, with the first record of the tick Ornithodoros guaporensis in Brazil.

    Science.gov (United States)

    Wolf, Rafael William; Aragona, Mônica; Muñoz-Leal, Sebastián; Pinto, Leticia Borges; Melo, Andréia Lima Tomé; Braga, Isis Assis; Costa, Jackeliny dos Santos; Martins, Thiago Fernandes; Marcili, Arlei; Pacheco, Richard de Campos; Labruna, Marcelo B; Aguiar, Daniel Moura

    2016-04-01

    Taking into account the diversity of small terrestrial mammals of the Pantanal, the present study aimed to verify the occurrence of infection by Ehrlichia spp., Anaplasma spp., Rickettsia spp., Hepatozoon spp., Babesia spp. and parasitism by ticks in non-volant small mammals collected in the Brazilian Pantanal. Samples of blood, liver and spleen were collected from 64 captured animals, 22 marsupials and 42 rodents. Pathogen detection was performed by the use of genus-specific Polymerase Chain Reaction (PCR) assays. Ticks collected from the animals consisted of Amblyomma sculptum and Amblyomma triste nymphs, and Ornithodoros guaporensis larvae. None of the vertebrate samples (blood, liver, or spleen) yielded detectable DNA of Rickettsia spp. or Ehrlichia spp. The blood of the rodent Hylaeamys megacephalus yielded an Anaplasma sp. genotype (partial 16S rRNA gene) 99% similar to multiple Anaplasma spp. genotypes around the world. The blood of three rodents of the species Calomys callosus were positive for a novel Hepatozoon sp. agent, phylogenetically related (18S rDNA gene) to distinct Hepatozoon genotypes that have been detected in rodents from different parts of the world. One marsupial (Monodelphis domestica) and three rodents (Thrichomys pachyurus) were positive to novel piroplasmid genotypes, phylogenetically (18S rDNA gene) related to Theileria bicornis, Cytauxzoon manul, and Cytauxzoon felis. The present study provides the first molecular detection of Hepatozoon sp. and piroplasmids in small mammals in Brazil. Additionally, we expanded the distribution of O. guaporensis to Brazil, since this tick species was previously known to occur only in Bolivia. Copyright © 2016 Elsevier GmbH. All rights reserved.

  19. Diversity and Impacts of Mining on the Non-Volant Small Mammal Communities of Two Vegetation Types in the Brazilian Amazon.

    Science.gov (United States)

    Ardente, Natália Carneiro; Ferreguetti, Átilla Colombo; Gettinger, Donald; Leal, Pricila; Mendes-Oliveira, Ana Cristina; Martins-Hatano, Fernanda; Bergallo, Helena Godoy

    2016-01-01

    The Carajás National Forest contains some of the largest iron ore deposits in the world. The majority of the minerals are found below a plant community known as Savana Metalófila, or "Canga", which represents only 3% of the landscape within the Carajás National Forest (CNF). The aim of our study was to understand the diversity of community of non-volant small mammals in the two predominant vegetation types: Ombrophilous Forest and Canga, and to examine how mining impacts these communities. Sampling was conducted from January 2010 to August 2011 in 11 sampling sites divided by the total area of Canga and 12 sampling sites in the forest, totalizing 23 sites. Of these, 12 sites (Canga and Forest) were considered impacted areas located close to the mine (mine. We recorded 28 species, 11 from the Order Didelphimorphia and 17 from the Order Rodentia. The two forest types shared 68.42% of the species found in the CNF. A gradient analysis (Non-metric multidimensional scaling) revealed that the first axis clearly separated the non-flying small mammal communities by vegetation type. Occupancy models showed that the detectability of species was affected by the distance from the mining activities. Of all the small mammals analyzed, 10 species were positively affected by the distance from mining in areas impacted (e.g. more likely to be detected farther from mining areas) and detectability was lower in impacted areas. However, three species were negatively affected by the distance from mining, with higher detectability in the impacted areas, and seven species showed no effect of their proximity to mining operations. To date, there are no studies in Brazil about the impact of mining on mammals or other vertebrates. This study reveals that the effect of mining may go beyond the forest destruction caused by the opening of the mining pits, but also may negatively affect sensitive wildlife species.

  20. Geopolymer obtained from coal ash; Geopolimeros obtidos a partir de cinzas de carvao mineral

    Energy Technology Data Exchange (ETDEWEB)

    Conte, V.; Bissari, E.S.; Uggioni, E.; Bernardin, A.M., E-mail: amb@unesc.net [Universidade do Extremo Sul Catarinense (UNESC), Criciuma, SC (Brazil). Grupo de Materiais Ceramicos e Vitreos

    2011-07-01

    Geopolymers are three-dimensional alumino silicates that can be rapidly formed at low temperature from naturally occurring aluminosilicates with a structure similar to zeolites. In this work coal ash (Tractebel Energy) was used as source of aluminosilicate according a full factorial design in eight formulations with three factors (hydroxide type and concentration and temperature) and two-levels. The ash was dried and hydroxide was added according type and concentration. The geopolymer was poured into cylindrical molds, cured (14 days) and subjected to compression test. The coal ash from power plants belongs to the Si-Al system and thus can easily form geopolymers. The compression tests showed that it is possible to obtain samples with strength comparable to conventional Portland cement. As a result, temperature and molarity are the main factors affecting the compressive strength of the obtained geopolymer. (author)

  1. Diseño de un prototipo de volante para un vehículo tipo formula SAE mediante técnicas de optimización estructural

    OpenAIRE

    Picón Mejía, Jaime Andrés

    2016-01-01

    En este proyecto técnico se presenta una metodología para el diseño y construcción de un prototipo de volante de dirección para un vehículo tipo formula SAE, aplicando técnicas de optimización estructural considerando procesos de manufactura aditiva. In this technical project, a methodology is presented for the design and construction of a prototype steering wheel for a Formula SAE vehicle, using structural optimization techniques considering additive manufacturing processes.

  2. Avaliação de um sistema de tratamento de águas cinzas em edificação de campus universitário

    OpenAIRE

    Mariana Cardoso Chrispim

    2014-01-01

    O reúso de água é um instrumento importante que contribui para a redução da pressão sobre os mananciais e para redução do consumo de água potável para fins que não requeiram água de padrão potável. Neste contexto, o presente estudo teve como objetivo principal analisar um sistema de coleta e tratamento de águas cinzas provenientes de pias de banheiro, chuveiros e máquina de lavar roupas tendo em vista o reúso não-potável em edificações. Os objetivos específicos foram: caracterizar qualitativa...

  3. Unidades de produção agrícola controlada no semiárido para o tratamento de água cinza

    OpenAIRE

    Aline Costa Ferreira; Viviane F. Silva; José G. de V. Baracuhy; Vera L. A. de Lima

    2013-01-01

    As reservas de água doce, juntamente com as limitações de lançamento de efluentes no meio ambiente, culminam para a necessidade do uso racional dos recursos hídricos de modo a reduzir os impactos negativos da geração de efluentes. Nesse contexto, o trabalho foi realizado objetivando-se implantar e monitorar eficiência do tratamento da água, para o semiárido, de unidades de produção agrícola controladas UPAC’s utilizando as águas cinzas de uma lavanderia comunitária.  A pesquisa foi desenvolvi...

  4. Influence of soft tissues on mandibular gray scale levels Influência dos tecidos moles sobre os níveis de cinza mandibulares

    Directory of Open Access Journals (Sweden)

    Paulo Henrique Couto Souza

    2004-03-01

    Full Text Available The purpose of this study was to analyze the gray levels, expressed in pixels, of the mandibular retromolar region, with regard to the influence of muscular and fat soft tissues near this region. Fifteen dry mandibles were X-rayed with the presence of soft tissue simulators. The radiographs were digitized and evaluated by Digora® software. A one cm thick layer of wax was used as a simulator of the muscular soft tissue. Animal fat samples of different thicknesses - 0.5, 1.0, 1.5 and 2.0 cm - were used as a simulator of the fat soft tissue. Results showed that the fat soft tissue simulator influenced the gray level values in pixels of the mandibular retromolar region when analyzed in different thicknesses using the Digora® digitized image software.O presente trabalho foi desenvolvido com o objetivo de analisar os níveis de cinza, expressos em "pixels", da região retromolar mandibular, considerando a influência dos tecidos moles muscular e, principalmente, adiposo adjacentes a essa região. Para o estudo, 15 mandíbulas secas foram tecnicamente radiografadas, sendo que as radiografias obtidas foram escaneadas e avaliadas pelo programa de imagens digitalizadas Digora®. Como simuladores dos tecidos muscular e adiposo, foram utilizadas cera utilidade na espessura de 1,0 cm e amostras de gordura animal em espessuras diferentes de 0,5; 1,0; 1,5 e 2,0 cm. Os resultados mostraram que o tecido adiposo foi capaz de influenciar a análise dos valores de níveis de cinza em "pixels" da região retromolar mandibular quando estudado em espessuras diferentes pelo programa de imagens digitalizadas Digora®.

  5. Qualidade das águas cinza tratada com fitorremediação em unidades de produção agrícola

    Directory of Open Access Journals (Sweden)

    Verena S. Baracuhy

    2015-07-01

    Full Text Available A irrigação é uma atividade que necessita de grande quantidade de água, o tratamento de águas cinzas provenientes de uma lavanderia pública em regiões semiáridas para reuso passa a ser uma alternativa de sobrevivência neste ambiente e favorável no desenvolvimento econômico sustentável. Nesse contexto, a pesquisa foi realizada no distrito de Ribeira no município de Cabaceiras - PB objetivando-se avaliar a qualidade da água cinza tratada com fitorremediação nas unidades de produção agrícola. Foram realizados dois tratamentos com(Tanque 2 e sem fitorremediação(Tanque 1, a cultura utilizada foi o capim elefante roxo. Foram coletadas amostras mensais e analisadas os seguintes parâmetros fisicoquimicos: Turbidez, pH, Condutividade elétrica (Ce, Demanda Quimica de Oxigenio(DQO e Fostoro Total. Para a turbidez os valores dos tratamentos foram acima de 1.000 UNT. Na demanda química de oxigênio, o valor mínimo foi de 311mg/L (setembro e máximo de 438mg/L (outubro no tanque 2 em contrapartida no tanque 1 o valor mínimo foi de 354mg/L (setembro e máximo de 618mg/L (outubro. O tratamento com fitorremediação teve uma maior eficiência na redução de DQO.Palavras – chave: capim elefante roxo, reuso, irrigação

  6. Gerenciamento da quantidade e da qualidade de água cinza em uma edificação residencial de alto padrão com vistas ao seu reuso não-potável.

    OpenAIRE

    VALENTINA, R. S. D.

    2009-01-01

    Uma forma de prevenir a escassez de água é favorecer o estímulo do seu uso através de uma gestão integrada, incentivando o uso racional e favorecendo o desenvolvimento de sistemas sustentáveis. Dentre as fontes alternativas de água, a água cinza é considerada a opção mais favorável devido a sua disponibilidade e a baixa concentração de poluentes. Este trabalho teve como objetivo pesquisar a produção e as características físico-químicas e biológicas da água cinza gerada em uma edificação resid...

  7. Avaliação da reologia, da RAA e das propriedades de argamassas no estado fresco utilizando cinza de eucalipto como substituição parcial ao cimento Portland

    Directory of Open Access Journals (Sweden)

    Débhora Flávia Soto França

    Full Text Available Resumo De acordo com o Balanço Energético Nacional (ano-base 2013, o consumo nacional de lenha foi de 79,29 milhões de toneladas. Estima-se uma geração de cinza na ordem de 3% durante esse processo, o que ocasiona problemas de armazenamento e de descarte. Sendo assim, a potencial transformação desses resíduos em matéria-prima para elementos construtivos apresenta-se como uma oportunidade para a preservação do meio ambiente e para a redução do custo de materiais da construção civil. O presente trabalho objetiva, portanto, avaliar a viabilidade desse reaproveitamento por meio da análise das propriedades das argamassas no estado fresco, incluindo a reologia, além da reatividade potencial (RAA, utilizando cinza proveniente da queima de cavacos de eucalipto com teores de 10%, 20% e 30% de substituição, em massa, ao cimento Portland. Através dos ensaios realizados verificou-se que a utilização da cinza de eucalipto como substituição parcial ao cimento não altera significativamente as propriedades de argamassas no estado fresco e não apresenta reatividade significativa, apresentando-se como uma alternativa de uso tecnicamente viável.

  8. COMPAR

    International Nuclear Information System (INIS)

    Kuefner, K.

    1976-01-01

    COMPAR works on FORTRAN arrays with four indices: A = A(i,j,k,l) where, for each fixed k 0 ,l 0 , only the 'plane' [A(i,j,k 0 ,l 0 ), i = 1, isub(max), j = 1, jsub(max)] is held in fast memory. Given two arrays A, B of this type COMPAR has the capability to 1) re-norm A and B ind different ways; 2) calculate the deviations epsilon defined as epsilon(i,j,k,l): =[A(i,j,k,l) - B(i,j,k,l)] / GEW(i,j,k,l) where GEW (i,j,k,l) may be chosen in three different ways; 3) calculate mean, standard deviation and maximum in the array epsilon (by several intermediate stages); 4) determine traverses in the array epsilon; 5) plot these traverses by a printer; 6) simplify plots of these traverses by the PLOTEASY-system by creating input data blocks for this system. The main application of COMPAR is given (so far) by the comparison of two- and three-dimensional multigroup neutron flux-fields. (orig.) [de

  9. Adição de gesso agrícola e cinza de madeira ao substrato no desenvolvimento de mudas de baruzeiro (Dipteryx alata Vog

    Directory of Open Access Journals (Sweden)

    C. A. Freitas

    2015-12-01

    Full Text Available O objetivo do trabalho foi avaliar o desenvolvimento de mudas de baruzeiro (Dipteryx alata Vog em função de proporções de gesso (0%; 1,6%; 3,2%; 4,8% e 6,4% com base em volume e adubação com cinza de madeira (ausência e presença misturadas ao substrato Bioplant®. Constituiu-se assim um esquema fatorial 5x2, em delineamento inteiramente ao acaso, com três repetições e quatro plantas por parcela. O experimento foi conduzido de janeiro a março de 2009, em viveiro com cobertura e laterais de sombrite preto (50% da luminosidade natural, situado na Fazenda Japão, município de Orizona, Goiás. Como recipiente foram utilizados sacos de polietileno de 15 x 25 cm, onde colocou-se uma sementes por recipiente, ficando a extremidade superior da semente cerca de 2,0 cm de profundidade. As irrigações foram realizadas diariamente, no período da tarde. Aos 152 dias após a semeadura, avaliou-se altura de muda (AM, diâmetro de caule (DC, número de folha (NF, número de folíolos por folha (NFF, número de folíolos por planta (NFP, comprimento da raiz principal (CR, massa da matéria seca das raízes (MSR, massa seca da parte aérea (MSPA, massa seca total (MSTO e índice de qualidade de Dickson (IQD. O gesso agrícola proporcionou melhor desenvolvimento inicial das mudas de baruzeiro, no entanto sua associação com cinzas de madeira, juntamente com o substrato, não favoreceu o desenvolvimento das mudas.Addition of agricultural plaster and wood ash to substrate in baruzeiro (Dipteryx alata Vog seedlings developingAbstract: This study aimed to evaluate the baruzeiro seedlings development in function of plaster proportions (0%, 1.6%, 3.2%, 4.8% and 6.4 % based on volume and fertilization with wood ash (absence and presence added to the substrate Bioplant ®. It constitutes therefore a 5x2 factorial arrangement, in a completely randomized design with three replications and four plants per plot. The experiment was conducted from January to March

  10. Viabilidade do emprego de cinza de casca de arroz natural em concreto estrutural. Parte I: propriedades mecânicas e microestrutura

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    Geraldo Cechella Isaia

    Full Text Available A casca de arroz, para ser utilizada em concreto estrutural, necessita de queima com temperatura controlada e de moagem prévia para lhe conferir maior reatividade pozolânica. Este trabalho discute o emprego da cinza de casca de arroz (CCA natural e residual, queimada sem controle de temperatura e sem moagem, de forma a simplificar o processamento da CCA e ampliar seu uso em concretos convencionais, em locais próximos onde é produzido, Estudou-se a sequência de colocação e o tempo de mistura dos materiais na betoneira, para obtenção do melhor desempenho da automoagem no tambor. Foram testadas misturas de concreto de referência com cimento Portland e com 15% e 25% de substituição de cimento, em massa, por CCA natural e moída. Foram realizados ensaios de resistência à compressão axial, tração por compressão diametral, módulo de elasticidade, retração total, porosimetria por intrusão de mercúrio, água quimicamente combinada e MEV. A análise dos resultados revela a viabilidade da substituição de 15% de cimento por CCA natural, com perda não significativa de resistência à tração e módulo de elasticidade a 28 dias, com recuperação total a 91 dias, para concretos com resistências à compressão entre 25 MPa e 40 MPa.

  11. Swine deep bedding ashes as a mineral additive for cement based mortar Cinzas de cama sobreposta de suínos como adição mineral em argamassas de cimento

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    Melissa Selaysim Di Campos

    2008-04-01

    Full Text Available The sustainability of intensive swine production demands alternative destinations for the generated residues. Ashes from swine rice husk-based deep bedding were tested as a mineral addition for cement mortars. The ashes were obtained at 400 to 600ºC, ground and sieved through a 325 mesh sieve (# 0.045 mm. The characterization of the ashes included the determination of the index of pozzolanic activity with lime. The ashes were also tested as partial substitutes of Portland cement. The mortars were prepared using a cement:sand proportion of 1:1.5, and with water/cement ratio of 0.4. Three percentages of mass substitution of the cement were tested: 10, 20 and 30%. Mortar performances were assessed at 7 and 28 days determining their compressive strength. The chosen condition for calcinations at the laboratory scale was related to the maximum temperature of 600ºC since the resulting ashes contained vitreous materials and presented satisfactory values for the pozzolanic index under analysis. The pozzolanic activity indicated promising results for ashes produced at 600ºC as a replacement of up to 30% in cement masses.A sustentabilidade das regiões de produção intensiva de suínos requer destinos alternativos para os resíduos gerados. Cinzas de cama sobreposta de suínos à base casca de arroz, foram testadas como adição mineral em substituição ao cimento. As cinzas foram obtidas nas temperaturas de 400 a 600ºC, moídas e passadas por peneira ABNT 325 (# 0,045 mm. A caracterização de cinzas incluiu a determinação do índice de atividade pozolânica com a cal. As cinzas também foram testadas como substitutos parciais de cimento Portland. As argamassas foram preparadas na proporção cimento:areia de 1:1,5 e com fator água-cimento de 0,4. Três porcentagens de substituição do cimento comercial foram usadas: 10, 20 e 30% em massa. O desempenho das argamassas foi avaliado aos 7 e aos 28 dias com a determinação da resistência

  12. Aproveitamento de águas pluviais e o reúso de águas cinzas em edifícios residenciais de Brasília – parte 2: viabilidade técnica e econômica

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    Daniel Sant'Ana

    2013-12-01

    Full Text Available A viabilidade da implementação de sistemas deaproveitamento águas pluviais (AAP e de reúsode águas cinzas (RAC em edifícios residenciaisé analisada e os resultados são apresentadosem dois artigos. A primeira parte caracteriza osusos-finais do consumo doméstico de água deedificações residenciais de Brasília e identifica opotencial de redução no consumo de água promovidopor diferentes sistemas AAP e RAC. Asegunda parte aponta possíveis soluções paraadaptação predial das tipologias residenciais deBrasília e faz uma avaliação financeira dos custos-benefícios para diferentes tipos de sistemasAAP e RAC. Em geral, resultados indicam quea adaptação predial voltada ao aproveitamentode águas pluviais em demandas externas é umasolução simples e rentável. Em alguns casos,reservatórios inferiores de água fria podem sermodificados para servir como cisternas de águapluvial, reduzindo custos de capital. Adaptaçãopredial voltada ao aproveitamento de águaspluviais em demandas internas demonstrou seruma solução inviável devido aos altos custosde reforma. Por outro lado, sistemas de reúsode águas cinzas em demandas internas promovembenefícios financeiros significativos, o queacaba compensando os custos de reforma. Oreúso de águas cinzas em demandas externasdemonstrou ser uma alternativa inviável devidoaos altos custos do sistema e aos baixos benefíciosfinanceiros.

  13. Análise por imagem digital dos níveis de cinza de fibras de reforço associadas a uma resina composta = Digital image analysis of the gray levels of reinforcement fibers associated with composite resin

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    Mussatto, Cristiane Maria Boniatti

    2005-01-01

    Full Text Available Mensurar a densidade óptica das fibras de reforço Connect, Ribbond e Interlig incluídas em resina composta Filtek Z250, no sistema DenOptix. Materiais e método: Foram confeccionados 10 blocos de resina composta associadas a cada tipo de fibra e dois blocos de resina Z250 pura (controle não-reforçado, totalizando 32 corpos-de-prova. Foram obtidas 3 radiografias digitais de cada corpo-de-prova, sobre uma placa óptica do sistema DenOptix, para cada posição: (A face lateral da fibra exposta aos raios -X; (B face tramada da fibra exposta aos raios-X. Em cada uma foram realizadas 3 leituras ópticas dos níveis de cinza em cada corpo-de-prova, em pontos aleatórios, sendo obtida uma média. Os valores médios dos níveis de cinza foram analisados pelo teste t de Student, ANOVA e teste de Tukey, ao nível de significância de 1%. Resultados e conclusões: Com relação à associação da resina + fibra na posição (A, observou-se a maior média de níveis de cinza para a resina pura, seguido por resina + Connect, resina + Interlig (que não diferiram entre si, e resina + Ribbond. Com relação à associação da resina + fibra na posição (B, observou-se que a resina pura apresentou maior média, seguida por resina + Connect, resina + Interlig e resina + Ribbond, sendo que as duas últimas não foram diferentes entre si. Os resultados sugerem que os níveis de cinza variaram em função do tipo de fibra de reforço e da posição na radiografia

  14. Aproveitamento de águas pluviais e o reúso de águas cinzas em edifícios residenciais de Brasília – parte 1: reduções no consumo de água

    OpenAIRE

    Daniel Sant'Ana; Louise Boeger; Lilian Monteiro

    2013-01-01

    Sistemas de aproveitamento de águas pluviais(AAP) e de reúso de águas cinzas (RAC) sãoestratégias de gestão descentralizadas capazesde promover reduções na demanda urbanade água. No entanto, pouco se sabe sobre suaviabilidade para uma implementação estratégicaem edificações. Para avaliar a viabilidadedesses sistemas hidráulicos em edificações residenciais,é fundamental compreender o usodesagregado de água para estimar o potencialde redução no consumo de água e verificar aaplicabilidade, os cu...

  15. Aproveitamento de águas pluviais e o reúso de águas cinzas em edifícios residenciais de Brasília – parte 2: viabilidade técnica e econômica

    OpenAIRE

    Sant'Ana, Daniel; Boeger, Louise; Monteiro, Lilian

    2013-01-01

    A viabilidade da implementação de sistemas deaproveitamento águas pluviais (AAP) e de reúsode águas cinzas (RAC) em edifícios residenciaisé analisada e os resultados são apresentadosem dois artigos. A primeira parte caracteriza osusos-finais do consumo doméstico de água deedificações residenciais de Brasília e identifica opotencial de redução no consumo de água promovidopor diferentes sistemas AAP e RAC. Asegunda parte aponta possíveis soluções paraadaptação predial das tipologias residenciai...

  16. Determinação das espécies de cromo nas cinzas da incineração de couro wet-blue em reatores de leito fixo e leito fluidizado

    OpenAIRE

    Clauren Moura Martins

    2001-01-01

    Este trabalho tem como objetivo a determinação quantitativa da concentração de cromo (III, VI e total) nas cinzas de serragem de couro wet-blue, incineradas em reatores de leito fixo nas temperaturas de 450, 550 e 650 C e reator de leito fluidizado nas temperaturas de 730, 780, 830 e 850 C, verificando se estes resultados estão dentro dos limites permitidos pelas normas ambientais brasileiras e, consequentemente, se em relação à concentração de cromo, os processos de incineração utilizados sã...

  17. Incorporação de cinza de lenha, lodo de estação de tratamento de água e cinza de casca de arroz em massa cerâmica: utilização da técnica de planejamento Grog incorporation in ceramic mass to manufacture of bricks: a study of the physical-mechanical properties

    Directory of Open Access Journals (Sweden)

    E. N. M de Medeiros

    2010-12-01

    Full Text Available Este trabalho apresenta um estudo das propriedades físico-mecânicas de massas cerâmicas com a incorporação de resíduos de cinza de lenha, lodo de estação de tratamento de água e cinza de casca de arroz, visando a sua futura utilização na produção de blocos. Os procedimentos metodológicos consistiram na caracterização química e mineralógica, na análise granulométrica e no delineamento de misturas com argila e resíduos por meio da técnica de planejamento. Foram produzidos corpos de prova por prensagem, com variações de composições no intervalo de 0 a 50% de resíduo e 50 a 100% de argila. A queima foi realizada em forno tipo mufla. As propriedades físico-mecânicas avaliadas foram absorção de água e módulo de ruptura à flexão. Como resultados principais, concluiu-se sobre a viabilidade em se utilizar composições com até 25% de resíduo nas temperaturas de 800, 900 e 1000 ºC.This paper presents a study of the physical and mechanical properties of ceramic mass with the incorporation of waste ash wood, sludge from water treatment and rice husk ash to determine whether its future use manufacture of bricks. The procedures consisted in the chemical and mineralogical characterization, particle size analysis and design of mixtures with clay and waste through planning technique. Bodies were produced by uniaxial pressing, with variations of compositions in the range of 0 to 50% waste and 50 to 100% clay. The burning was carried out in muffle furnace. The physical and mechanical properties evaluated were water absorption and modulus of rupture strength. The main result, it was concluded on the feasibility of using compositions with up to 25% of waste at temperatures of 800, 900 and 1000ºC.

  18. Utilização de zeólitas sintetizadas a partir de cinza de carvão para remoção de azul de metileno em água

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    Denise Alves Fungaro

    2009-01-01

    Full Text Available A adsorção de azul de metileno de solução aquosa foi realizada usando-se zeólitas de cinza de carvão como adsorventes de baixo custo. A amostra de cinza de carvão foi convertida em zeólitas por tratamento hidrotérmico usando parâmetros de síntese diferentes. Os materiais foram caracterizados por análise físico-química e estudos de DRX e MEV. As isotermas de adsorção ajustaram-se ao modelo de Freundlich. Os valores da capacidade de adsorção foram similares para os adsorventes. Estudos cinéticos indicaram que a adsorção seguiu o modelo de pseudo-segunda-ordem./////////// The adsorption of methylene blue from aqueous solution was carried out using zeolites synthesized from coal ash as low-cost adsorbents. The coal ash sample was converted to zeolites by hydrothermal treatment using different synthesis parameters. The materials were characterized by physical-chemical analysis, XRD and SEM studies. The adsorption isotherms can be fitted by Freundlich model. The values of the adsorption capacity of adsorbents were similar for adsorbents. Kinetic studies indicate that the adsorption follows pseudo-second-order kinetic model.

  19. Avaliação do turismo de observação de botos-cinza na Reserva Faunística Costeira de Tibau do Sul (REFAUTS, Rio Grande do Norte, Brasil

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    Diana Gonçalves Lunardi

    2017-04-01

    Full Text Available O turismo de observação de cetáceos (TOC pode contribuir para a conservação de cetáceos e desenvolvimento econômico local. Este estudo teve como objetivo caracterizar o turismo de observação de botos-cinza, de forma a subsidiar o plano de manejo da Reserva Faunística Costeira de Tibau do Sul (REFAUTS. Durante quatro expedições à área de estudo, foram realizadas entrevistas com mestres de embarcação, censos e vistorias nas embarcações licenciadas e registro do fluxo do TOC. Nós registramos 11 embarcações licenciadas operando na REFAUTS, 368 passeios durante 16 dias de amostragem e um total de 4.717 turistas. Na REFAUTS, os mestres de embarcação não cumpriram a determinação prevista em lei quanto a limitação do número de barcos nas enseadas em 30% dos registros. O TOC na REFAUTS vem desempenhando um papel importante na economia local, contudo é preciso que um plano de ação seja implantado, para assegurar a conservação do boto-cinza na REFAUTS.

  20. Efecto del tratamiento térmico en la morfología y conductividad térmica de cenizas volantes de la combustión de carbón

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    Gabriel Peña-Rodríguez

    2014-07-01

    Full Text Available Se presenta el efecto del tratamiento térmico en la conductividad térmica efectiva (ke a temperatura ambiente de polvos de cenizas volantes provenientes de la combustión de carbón de la Central Termoeléctrica de Termotasajero S.A. Dicho parámetro termofísico fue medido usando el sistema KD2Pro® Thermal Properties Analyzer, el cual funciona con el principio físico de flujo lineal transitorio de calor. El tratamiento térmico de las muestras se realizó usando una mufla eléctrica Ney® Vulcan D-130 para el rango de temperaturas de 1050, 1100, 1130, 1200, 1250 y 1300 °C. La porosidad y densidad aparente fue hallada usando la norma NTC 4321-3. La morfología superficial de las muestras fue analizada usando Microscopía Electrónica de Barrido (MEB. Los resultados muestran que a medida que se incrementó la temperatura en el tratamiento térmico, las muestras cambiaron de color de gris oscuro a beige; disminuyó el porcentaje de porosidad, debido a su proceso de vitrificación, y se aumentó la densidad y, por ende, la conductividad térmica efectiva. Los valores reportados de ke son muy importantes en los cálculos del coeficiente de transmitancia térmica en los procesos de transferencia de calor donde se utilicen estas cenizas.

  1. Uso de la ceniza volante de lignitos (c.v.l. como materia secundaria. Un resumen considerando especialmente la situación en la República Democrática Alemana (RDA

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    Beyer, Lothar

    1989-06-01

    Full Text Available Not available.

    La presente publicación es un resumen sobre los trabajos ejecutados para el aprovechamiento de las cenizas volantes de lignito (c.v.l. en la República Democrática Alemana. Se consideran especialmente los resultados encontrados en patentes de invención y se involucran algunas veces trabajos de otros países con fines de comparación. Los aspectos claves cubren las investigaciones aplicativas para el uso de c.v.l. en la construcción civil, protección del ambiente y transformaciones químicas para obtener productos útiles. Se presentan conclusiones sobre perspectivas y se refleja el importante papel de los análisis físico-químicos para superar el empirismo en relación con el uso de c.v.l. [de] Nutzung von Braunkohlenfilterasche (BFA ais Sekundärrohstoff eine Übersicht unter besonderer Berücksichtigung der Situation in der Deutschen Demokratischen Republik (DDR Die vorliegende Veröffentlichung ist eine Zusammenfassung der in der Deutschen Demokratischen Republik durchgeführten Arbeiten zur Anwendung der Braunkohlenfilterasche (BFA. Besonders werden die in Patenten beschriebenen Ergebnisse berücksichtigt, und zum Vergleich werden einige Arbeiten aus anderen Ländern einbezogen. Die Hauptaspekte beziehen sich auf angewandte Forschungsarbeiten zur Nutzung der BFA im Bauwesen, zum Umweltschutz und zur chemischen Umwandlung für die Herstellung nützlicher Stoffe. Es werden perspektivische Schluβfolgerungen gezogen, und es wird die bedeutende Rolle der physikalisch-chemischen Analytik zur Überwindung einer gewissen Empirie im Zusammenhang mit der Nutzung der BFA herausgestellt.

  2. Glass-ceramic material of the Si-Ca-K system sintered from sugarcane bagasse ash; Material vitro-ceramico do distema SiO{sub 2}-CaO-K{sub 2}O sinterizado a partir de cinza de bagaco de cana de acucar

    Energy Technology Data Exchange (ETDEWEB)

    Teixeira, S.R.; Silva, R.A.; Santos, G.C.; Santos, G.T.A., E-mail: rainho@fct.unesp.b [Universidade Estadual Paulista (DFQB/FCT/UNESP), Presidente Prudente, SP (Brazil). Fac. de Ciencias e Tecnologia. Dept. de Fisica, Quimica e Biologia; Romero, M.; Rincon, J.Ma. [Consejo Superior de Investigaciones Cientificas (IETCC/CSIC), Madri (Spain). Inst. de Ciencias de la Construccion Eduardo Torroja; Reynoso, V.C.S. [Universidade Estadual Paulista (FEIS/UNESP), Ilha Solteira, SP (Brazil). Faculdade de Engenharia

    2009-07-01

    This study analyses the crystallization of glasses obtained from two samples of sugarcane bagasse ash - SCBA (named Cinza 07 and Cinza 08) mixed with carbonates (calcium and potassium). The glasses and their crystallization were examined using differential thermal analysis (DTA), X-ray fluorescence (XRF) and X-ray diffraction (XRD). The characterizations of the ashes show that they consist mainly of crystalline materials, predominantly quartz, with iron, potassium and aluminum oxides as minor elements. For the sample Cinza07 the DTA data presents broad and overlaid crystallization peaks, indicating crystallization of more than two different phases. The DTA results of samples with different grain-size distribution show that the crystallization peak intensities increase as the sample grain-size decreases, suggesting that surface crystallization actively participate on the mechanism of crystallization. For the sample Cinza 08 the DTA data presents two well defined peaks. In this case, the more intense peak was evaluated to obtain kinetic data (Eat= 355 kJ/mol) to the major phase (Wollastonita). (author)

  3. Avaliação do risco microbiológico decorrente do reuso de águas cinza em uma edificação residencial de alto padrão.

    OpenAIRE

    OLIVEIRA, L. O. V.

    2009-01-01

    Qualquer atividade de reúso da água implica em considerações relativas à proteção da saúde. Nos casos de reúso de maior porte uma análise de riscos pode ser aplicada, a fim de avaliar os riscos envolvidos. Este trabalho tem como objetivo promover a caracterização físico-química e microbiológica da água cinza produzida em uma edificação residencial de alto padrão, no Município de Vitória (ES), e avaliar o risco microbiológico envolvido no reúso ao longo de todo o sistema hidro-sanitário da ed...

  4. Tratamento térmico de resíduos da indústria calçadista : estudo da gaseificação, tratamento dos gases e aproveitamento das cinzas

    OpenAIRE

    Bruno München Wenzel

    2013-01-01

    Na gestão dos resíduos sólidos prioriza-se o emprego de técnicas capazes valorizarem os resíduos. Dentre as tecnologias para recuperação energética de resíduos (waste-to-energy), a gaseificação com posterior combustão dos gases vem sendo investigada para o tratamento térmico de resíduos de couro curtidos com sais de cromo, que possibilita a reciclagem do cromo contido nas cinzas. Este trabalho foi desenvolvido com o objetivo geral de contribuir com a qualificação, valorização e viabilização d...

  5. Cinética de vulcanização de composições de borracha natural com incorporação de cinza de casca de arroz Vulcanization kinetics of natural rubber filled with rice husk ash

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    Helson M. da Costa

    2003-06-01

    Full Text Available Cinza da casca de arroz foi incorporada em borracha natural (NR utilizando-se um misturador de cilindros. O sistema de vulcanização convencional (CV foi escolhido e os estudos sobre a cura das composições foram conduzidos em um Curômetro TI-100. As curvas de torque foram obtidas em 150, 160, 170 e 180 °C. A velocidade global e a energia de ativação aparente para o processo de vulcanização foram calculadas para cada composição, assumindo que a vulcanização segue uma cinética de primeira ordem. Para fins de comparação, duas cargas comerciais, sílica precipitada (Zeosil-175 e negro de fumo (N762, foram também usadas. Foi observado que a adição da cinza da casca de arroz às composições de NR, em comparação às outras cargas utilizadas, aumentou a velocidade de reticulação e diminuiu a energia de ativação aparente de modo mais marcante.Rice husk ash was incorporated into natural rubber (NR using a laboratory size two-roll mill. A conventional vulcanization system (CV was chosen and cure studies were carried out on a TI-100 Curometer. The torque curves were obtained at 150, 160, 170, and 180 °C. The overall rate and the apparent activation energy for the vulcanization process were calculated for each compound assuming that vulcanization follows first-order kinetics. For the purpose of comparison, two commercial fillers, precipitated silica (Zeosil-175 and carbon black (N762, were also used. In comparison to the other fillers used, the addition of rice husk ash to NR compounds increased the crosslinking rate and lowered the apparent activation energy in a more marked way.

  6. Análise da interface entre agregados reciclados de concreto e argamassas de concretos com cinza de casca de arroz e fíler basáltico por nanoindentação

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    Daniel Gustavo Brusius Wilbert

    Full Text Available Resumo Os agregados provenientes da reciclagem de concreto geralmente possuem propriedades inferiores às dos agregados naturais, o que limita suas alternativas de reciclagem. Entretanto, muitos estudos vêm demonstrando seu potencial de utilização na confecção de concretos, a partir de avaliações de propriedades mecânicas e microestruturais, e de melhorias na forma de mistura dos agregados. O presente trabalho analisa a viabilidade de utilização da técnica de nanoindentação para a avaliação da interface que se forma entre a pasta e o agregado reciclado em concretos com esse tipo de agregado. Foram produzidos corpos de prova que representam a região de interface em concretos em que os agregados reciclados foram adicionados à mistura no estado seco, método que vem sendo utilizado com o intuito de melhorar a zona de transição em função da absorção do excesso de água da pasta e de partículas de aglomerante pelos poros vazios do agregado reciclado. Os corpos de prova de referência foram comparados com outros em que foi realizada a adição de fíler basáltico e de cinza de casca de arroz. A técnica de nanoindentação possibilitou verificar que a utilização de agregado no estado seco gera zonas de transição de elevada qualidade e que a adição de cinza de casca de arroz aumenta a dureza da região de interface.

  7. Determinação dos teores de umidade e cinzas de amostras comerciais de guaraná utilizando métodos convencionais e análise térmica Determination of humidity and ash content of guarana commercial samples using conventional method and thermal analysis

    Directory of Open Access Journals (Sweden)

    Adriano Antunes de Souza Araújo

    2006-06-01

    Full Text Available Paullinia cupana Kunth, vegetal popularmente conhecido como guaraná, é uma planta da família Sapindaceae predominante na região amazônica. A baixa qualidade deste produto pode ser atribuída a espécies e variedades menos nobres, técnicas de colheita e/ou de processamento inadequado ou, ainda, devido à adição de substâncias que não fazem parte de sua composição natural. Neste trabalho objetivou-se avaliar, a partir da termogravimetria (TG/termogravimetria derivada (DTG e calorimetria exploratória diferencial (DSC, o comportamento térmico de amostras comerciais de guaraná em pó existentes no Brasil e estabelecer um estudo comparativo entre os métodos convencionais e termogravimétrico para determinação dos teores de umidade e cinzas. A similaridade entre os perfis das curvas TG/DTG e DSC indicam que não há diferenças entre as amostras. A utilização da TG mostrou que é possível reduzir o tempo de análise, utilizar menor quantidade de amostra, assim como, fazer a determinação simultânea dos teores de umidade e cinzas. Em relação ao método convencional, erros de análise inerentes à manipulação das amostras são minimizados. As técnicas termoanalíticas mostram-se como ferramentas potenciais para a obtenção de parâmetros tecnológicos, em controle de qualidade, torrefação e condições adequadas de armazenamento.Paullinia cupana Kunth a vegetable popularly known as guarana, belongs to the Sapindaceas plant family and is predominant in the Amazon region. The low quality of this product can be attributed to the species and less noble varieties, harvest techniques and/or inadequate processing or, yet due to addition of substances that are not included in its natural composition. The main goal of this work was to evaluate from thermogravimetry (TG/derivative thermogravimetry (DTG and differential scanning calorimetry (DSC, the thermal behavior of powdered guarana samples in the Brazilian market in order to

  8. Níveis de mercúrio em peixes consumidos pela comunidade indígena de Sai Cinza na Reserva Munduruku, Município de Jacareacanga, Estado do Pará, Brasil Mercury levels in fish consumed by the Sai Cinza indigenous community, Munduruku Reservation, Jacareacanga County, State of Pará, Brazil

    Directory of Open Access Journals (Sweden)

    Edilson da Silva Brabo

    1999-04-01

    Full Text Available O estudo consiste em avaliar os níveis de mercúrio no pescado consumido pela comunidade indígena de Sai Cinza (Reserva Munduruku no Estado do Pará, e associá-los com os hábitos de consumo da população. Um total de oitenta espécimes de peixes foram capturados. As determinações de Hg foram realizadas por absorção atômica. A concentração média de Hg nas espécies carnívoras foi de 0,293 µg/g (DP = 0,104 enquanto nas não carnívoras foi de 0,112 µg/g (DP = 0,036. As espécies referidas como de maior consumo ente os 330 indivíduos entrevistados foram: tucunaré, pacu, jaraqui, traíra, aracu, matrinchã e caratinga. As espécies com concentrações mais elevadas de Hg foram tucunaré e traíra, que estão entre os peixes mais consumidos. A freqüência de consumo constitui-se num fator importante na avaliação de risco de contaminação por mercúrio em comunidades que não têm outras alternativas de alimentação.This study evaluated fish consumption and mercury levels in fish consumed by an indigenous community in the State of Pará. Eighty fish samples were collected (barbado, surubim, traíra, tucunaré, piranha, aruanã, caratinga, aracu, mandiá, jandiá, and pacu. Mercury analysis was performed using a Mercury Analyzer HG-3500. Average mercury concentration in carnivorous species was 0.293 µg/g (SD = 0.104, while in non-carnivorous species it was 0.112 µg/g (SD = 0.036. Brazilian legislation establishes a maximum permissible limit of 0.5 µg/g for fish consumption. No significant correlation was found between fish length or weight and mercury concentration. Types of fish most frequently consumed by the community were tucunaré, pacu, jaraqui, traíra, aracu, matrinchã, and caratinga. Carnivorous species, especially tucunaré and traíra, amongst the most frequently eaten, had higher mercury levels than non-carnivorous species. Frequency of consumption is crucial to assess the risk of mercury contamination in

  9. Enquêtes sur les soucoupes volantes

    OpenAIRE

    Lagrange, Pierre

    2007-01-01

    La dispute autour du mot « preuve » se réduit à une question : Qu'est-ce qui constitue une preuve ? Faut-il qu'un ovni atterrisse à l'entrée du Pentagone, près des bureaux des chefs d'État-Major ? Ou bien est-ce une preuve quand une station de radar au sol détecte un ovni, envoie un jet l'intercepter, que le pilote du jet le voit et le suit sur son radar pour finir par le voir disparaître à une vitesse phénoménale ? Ou est-ce une preuve quand un pilote tire sur un ovni et maintient son histoi...

  10. Verba volant, scripta manent / Milvi Tedremaa

    Index Scriptorium Estoniae

    Tedremaa, Milvi, 1937-2012

    1999-01-01

    Rets. rmt.: Meie õppisime raamatukogundust Tartu Ülikoolis / koost. Maare Kümnik, Kaja Noodla. Tartu, 1998. Vastukaja: Peep, Laine. Mitte ainult Milvi Tedremaale // Raamatukogu (1999) nr. 4, lk. 44

  11. Desempenho de um “wetland” vertical aplicado ao tratamento do efluente de um filtro anaeróbio em uma estação de tratamento de águas cinzas claras visando o reúso não potável em edificações residenciais

    OpenAIRE

    Sarnaglia, Solange Aparecida Alho

    2014-01-01

    No tratamento de água cinza com vistas ao reúso predial os “wetlands” têm se mostrado como uma opção viável devido à boa remoção de poluentes, ao baixo custo de implantação e operação, além do baixo impacto ambiental quando comparados a outros sistemas. O presente estudo teve como objetivo caracterizar físico-química e microbiologicamente a água cinza clara gerada em um edifício universitário avaliar a influência das cargas hidráulica e orgânica na remoção de matéria orgânica, turbidez e de c...

  12. Durabilidad del hormigón: Acción del agua de mar sobre un cemento portland resistente a los sulfatos. Influencia de la adición de escorias y de cenizas volantes

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    Gaspar Tebar, Demetrio

    1991-12-01

    Full Text Available This article, is part of a long time ICCET investigation programs studies the variation of the mechanical resistance to flexotraction 1: 3 normalized mortar with 1 x 1 x6cm dimension, using sulphate-resistent portland cement mixed with 15-35-60 and 70% parts of a furnace slag, a fiy ash or silica sand. The samples were submitted to the action of AS.T.M. artificial sea water and filtered potable water during several time periods (3 years for the first and second addition and 1 year for the third after the cured period (1 day at 100% R.H. and 21 days inside filtered potable water. The evolution of the ionic concentration of the aggressive solutions were studied and also the new phases formed with its new structural composition. Finally, and account is given of the researches and first results about the behavior of the mortars and concretes made with two different industrial cements and submitted to the natural sea water at a selected area of the marine Huelva-Port.

    En este artículo, que forma parte de un Proyecto de Investigación del ICCETa largo plazo, se estudia la variación de las resistencias mecánicas —a flexotracción— de las probetas de mortero normalizado (1:3, de 1x1x6 cm, mezclando un cemento portland resistente a los sulfates y sus mezclas (cemento/adición = 85/15 - 65/35 - 40/60 y 30/70, en peso, con una escoria, ceniza volante y arena silícea. Se someten a la acción de agua del mar artificial ASTM y de agua potable filtrada durante diversos períodos de tiempo (hasta 3 años para las dos primeras adiciones, y hasta 1 año para la tercera después de la fase de curado (1 día en cámara húmeda y 21 días bajo agua potable filtrada. Se estudia la evolución de la concentración iónica de los medios en donde han estado sumergidas dichas probetas de mortero, las características químicas de las nuevas fases sólidas formadas y la composición estructural de estas nuevas fases sólidas. Por último, se da cuenta

  13. Downward surface flux computations in a vertically inhomogeneous grey planetary atmosphere Cálculo do fluxo radiativo superficial em uma atmosfera planetária cinza e verticalmente não-homogênea

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    Marcos Pimenta de Abreu

    2008-03-01

    Full Text Available We describe an efficient computational scheme for downward surface flux computations in a vertically inhomogeneous grey planetary atmosphere for different values of solar zenith angle. We start with the basic equations of a recently developed discrete ordinates spectral nodal method, and we derive suitable bidirectional functions whose diffuse components do not depend on the solar zenith angle. We then make use of these bidirectional functions to construct an efficient scheme for computing the downward surface fluxes in a given model atmosphere for a number of solar zenith angles. We illustrate the merit of the computational scheme described here with downward surface flux computations in a three-layer grey model atmosphere for four values of solar zenith angle, and we conclude this article with general remarks and directions for future work.Este artigo descreve um esquema computacional baseado em desenvolvimentos recentes do método espectro-nodal de ordenadas discretas para o cálculo eficiente do fluxo radiativo superficial em uma atmosfera planetária cinza e verticalmente não-homogênea para valores distintos do ângulo zenital solar. A partir das equações básicas do método espectro-nodal de ordenadas discretas, são obtidas funções bidirecionais discretas cujas componentes difusas não dependem do ângulo zenital solar. Com essas funções bidirecionais discretas, é construído um esquema computacional para calcular eficientemente fluxos radiativos superficiais em uma dada atmosfera-modelo para vários ângulos zenitais solares. O mérito computacional do esquema resultante é ilustrado com resultados numéricos para os fluxos radiativos superficiais em uma atmosfera-modelo cinza com três camadas para quatro valores distintos do ângulo zenital solar. Este artigo é finalizado com observações gerais e indicações de trabalhos futuros.

  14. Características físicas e mecânicas de misturas de solo, cimento e cinzas de bagaço de cana-de-açúcar Physical and mechanical characteristics of soil-cement-bagasse ash mixtures

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    Martha Del C. Mesa Valenciano

    2004-12-01

    Full Text Available Este trabalho teve por finalidade analisar algumas características de misturas de solo, cimento e cinzas de bagaço de cana-de-açúcar para sua possível utilização na fabricação de materiais alternativos de construção. Para tal, amostras de cinzas de bagaço de cana-de-açúcar foram submetidas a um tratamento prévio que consistia de peneiramento e moagem, antes de serem incorporadas às misturas de solo e cimento. Diferentes combinações de cimento-cinzas foram estudadas, determinando-se, para cada uma delas, a consistência normal e a resistência à compressão simples, aos 7 e 28 dias. Posteriormente, corpos-de-prova moldados com tais misturas de solo-cimento-cinzas foram submetidos a ensaios de compactação, compressão simples e absorção de água. Os resultados indicaram a possibilidade de substituir até 20% do cimento Portland, na mistura, por cinzas de bagaço de cana-de-açúcar, sem prejuízo da resistência à compressão simples.This work was done with the objective of studying some physical and mechanical characteristics of the sugarcane bagasse ash added to a soil-cement mixture, in order to obtain an alternative construction material. The sugarcane bagasse ash pre-treatment included both sieving and grinding, before mixing with soil and cement. Different proportions of cement-ash were tested by determining its standard consistence and its compressive resistance at 7 and 28 days age. The various treatments were subsequently applied to the specimens molded with different soil-cement-ash mixtures which in turns were submitted to compaction, unconfined compression and water absorption laboratory tests. The results showed that it is possible to replace up to 20% of Portland cement by sugarcane bagasse ash without any damage to the mixture's compressive strength.

  15. Efeito da aplicação de silicato de cálcio e de cinza de casca de arroz sobre a incidência de fungos associados a manchas em sementes de arroz irrigado

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    Rafaela Carolina Constantino Roma-Almeida

    2016-03-01

    Full Text Available RESUMO O objetivo deste trabalho foi avaliar o efeito da aplicação de silicato de cálcio e de cinza de casca de arroz (CCA na incidência de fungos associados a manchas em sementes de arroz irrigado. Plantas de arroz foram submetidas à aplicação de silicato de cálcio ou CCA nas doses de 0, 51, 153, 256 e 357 kg ha-1de silício (Si. Dois experimentos foram conduzidos, sendo um na safra 2007/2008 e outro na safra 2008/2009 e, posteriormente, amostras de sementes foram analisadas em laboratório. Foram realizadas avaliações do Índice de Escurecimento de Sementes (IES, da concentração de Si no pericarpo das sementes e a determinação da diversidade dos fungos presentes nas sementes. Não houve efeito das duas fontes de Si empregadas, nas doses utilizadas nos dois experimentos no IES e na concentração de Si. Os fungos fitopatogênicos encontrados em ambos experimentos foram Alternaria padwickiii, Bipolarisoryzae, Botrytis cinerea, Curvularia lunata, Fusarium semitectum, F. solani, Microdochium oryzae, Nigrospora oryzae, Phoma sorghina e Pyriculariaoryzae. A incidência destes fungos não foi afetada pela aplicação das fontes de Si nas doses utilizadas.

  16. DEVELOPMENT OF Annona crassiflora Mart. (ARATICUM SEEDLINGS IN SUBSTRATA WITH SUGAR CANE BAGASSE ASH DESENVOLVIMENTO DE MUDAS DE Annona crassiflora Mart. (ARATICUM EM SUBSTRATOS COM CINZA DE BAGAÇO DE CANA

    Directory of Open Access Journals (Sweden)

    Andréia Luiza Salgado

    2009-01-01

    -paper-source:0;} div.Section1 {page:Section1;} -->

    Analisou-se o efeito de cinco substratos, constituídos de diferentes proporções de terra de subsolo, calcário e cinza de bagaço de cana, na altura, diâmetro de caule e peso fresco e seco da parte aérea e do sistema radicular de mudas de araticum (Annona crassiflora Mart.. Os cinco substratos montados foram: terra pura; terra pura com calcário; terra + 1/3 do volume com cinza; terra + 1/3 do volume com cinza + calcário; e terra + 2/3 do volume com cinza. O experimento foi realizado na Escola de Agronomia e Engenharia de Alimentos da Universidade Federal de Goiás, Goiânia, Goiás, no período de fevereiro a outubro de 2003. Foi conduzido sob telado, a 50% de sombreamento, em um delineamento de blocos casualizados, em esquema fatorial 2 x 2 + 1 (adicional. Observou-se que nenhum dos substratos proporcionou diferenciação no crescimento e diâmetro do caule nas mudas. Porém, observou-se, também, o efeito positivo da aplicação do calcário no peso fresco e seco da parte aérea e do sistema radicular das mudas. A aplicação de cinza de bagaço de cana mostrou-se prejudicial ao crescimento das mudas.


    PALAVRAS-CHAVE: Propagação de mudas; frutíferas do Cerrado; resíduos industriais.

  17. Potencial da cinza do bagaço da cana-de-açúcar como material de substituição parcial de cimento Portland Potential of sugarcane bagasse ash as a partial replacement material for Portland cement

    Directory of Open Access Journals (Sweden)

    Marcos O. de Paula

    2009-06-01

    Full Text Available Este trabalho, voltado para a avaliação do potencial da cinza do bagaço da cana-de-açúcar (CBC como material de substituição parcial do cimento Portland em argamassa, objetivou apresentar opção viável para a destinação deste resíduo, cuja quantidade gerada aumentará significativamente nos próximos anos, em decorrência da ampliação do setor de produção de álcool combustível; além disso, o emprego da CBC como adição mineral, substituindo parte do cimento em argamassas e concretos, contribui para a redução do impacto ambiental desses materiais, em boa parte decorrente da produção do cimento. O procedimento experimental abordou não só caracterização da CBC mas também a avaliação, através de ensaios físicos e mecânicos, em que os resultados mostraram que o bagaço apresenta rendimento de CBC de 10%, com a cinza sendo composta de 84% de SiO2 e 5% de Carbono. A sílica na CBC apresenta-se na fase amorfa e nas fases cristalinas de cristobalita e quartzo. Os índices de atividade pozolânica comprovam a reatividade da CBC. Do ponto de vista da resistência à compressão, argamassas com teores de CBC entre 0 e 30% indicaram a possibilidade de substituição de até 20% do cimento pela CBC.This study is focused on the evaluation of the effects of the partial replacement of Portland cement by sugarcane bagasse ash (CBC in mortars. The main objective was to find a suitable destination for an agricultural residue generated in an increasing amount in Brazil, as a result of the boom of the use of ethanol as an alternative fuel to gasoline. Also, the use of CBC as a mineral admixture in mortars and concretes contributes to a decrease in the environmental impact of these materials related to cement production. Experimental techniques were applied both for the CBC characterization and for the evaluation of its use as a mineral admixture in mortars, based on mechanical and physical tests. The yield of CBC from sugarcane

  18. Avaliação da resistência a fadiga dos Engineered Cementitious Composites (ecc, reforçados com fibra de polipropileno e produzidos com adição de cinza de casca de arroz

    Directory of Open Access Journals (Sweden)

    Alceu Lopes de Freitas Júnior

    2017-07-01

    Full Text Available O Engineered Cementitious Composites - ECC – é um tipo especial de compósito cimentício de alto desempenho reforçado com fibra, cuja principal característica é a alta ductilidade. O traço de ECC é composto por cimento, material pozolânico, agregado miúdo e fibras. Este estudo avaliou a resistência à fadiga de traços de Engineered Cementitious Composites reforçados com fibras de polipropileno - PPECC – e cuja composição da matriz cimentícia tenha a incorporação de cinza de casca de arroz como material suplementar. Para isto, foram produzidos corpos de prova com substrato de concreto para pavimento e overlay com o traço de PPECC desenvolvido. Os corpos de prova foram submetidos aos ensaios de flexão a quatro pontos (estático e cíclico. Compararam-se os resultados obtidos no ensaio estático dos traços de PPECC com os resultados obtidos neste mesmo ensaio com corpos de prova produzidos somente por concreto para pavimento. Foram analisados os resultados dos ensaios cíclicos em diferentes intervalos de tensões. Com os resultados variação da tensão x números de ciclos, obtidos no ensaio cíclico, foi avaliado o comportamento à fadiga do compósito.

  19. Determinação de massa fresca, massa seca, água e cinzas totais de folhas de Cissus verticillata (L. Nicolson & C. E. Jarvis subsp. verticillata e avaliação do processo de secagem em estufa com ventilação forçada

    Directory of Open Access Journals (Sweden)

    T. V. BRAGA

    2009-01-01

    Full Text Available

    Cissus verticillata (L. Nicolson & C. E. Jarvis subsp. verticillata (Vitaceae é conhecida popularmente como insulina vegetal, cortina japonesa, uva-brava, anil trepador e cipó-pucá e utilizada na medicina popular na forma de chá das folhas no tratamento da diabetes, como antiinflamatório, antiepilético, antihipertensivo, antitérmico, antireumático, antigripal e contra infecções respiratórias. O objetivo deste estudo foi avaliar os teores de massa fresca, massa seca, percentual de água e percentual de cinzas totais, visando melhoria das condições de secagem, armazenamento, dispensação e uso pela população. As folhas da espécie foram coletadas no bairro Antônio Dias, Ouro Preto, Minas Gerais, Brasil. Foram selecionadas, lavadas e secas em estufa com ventilação forçada à 45ºC e determinou-se as cinzas totais e perda por dessecação (através do método gravimétrico, ambos de acordo com a Farmacopéia Brasileira. Os resultados mostraram que as folhas de C. verticillata subsp. verticillata possuem alto teor de água. O processo de secagem em estufa de ventilação forçada, a temperatura de 45ºC, foi eficaz, proporcionando folhas com 11,47% de umidade e 17,99% de cinzas totais. Palavras-chave: Cissus verticillata; insulina vegetal; qualidade; gravimetria.

  20. Análise da viabilidade da utilização da cinza de bagaço de cana-de-açúcar como substituição parcial do cimento Portland (doi.:10.5216/reec.V9i3.32023

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    Rodrigo Gustavo Delalibera

    2014-11-01

    Full Text Available RESUMO: Utilização de cinza de bagaço de cana-de-açúcar como material suplementar ao cimento Portland, visando minimizar a retirada de calcário, reduzindo a emissão de gás carbônico e preservando jazidas naturais. Foi avaliada a viabilidade do uso parcial de cinza de bagaço de cana-de-açúcar na substituição do cimento Porltand, através da análise de ensaios de resistência à compressão de corpos de prova cilíndricos de concreto aos 7, 14 e 28 dias de idade, apresentando uma substituição em massa de 10, 20 e 30% do cimento Portland. Considerando-se os resultados de resistência à compressão obtidos verificou-se que é viável a substituição parcial de cinza de bagaço de cana-de-açúcar, desde que a relação água/cimento e a porcentagem em massa a ser substituída sejam adequadas. Deste maneira, espera-se que a utilização da cinza do bagaço de cana-de-açúcar possa interferir economicamente e ecologicamente na produção do concreto. ABSTRACT: This paper examines the sugarcane bagasse ash use as supplementary material to Portland cement for the purpose of minimize the limestone removal to reduce emissions carbonic gas preserving natural deposits. The feasibility sugarcane bagasse ash use were analyzed. Through an analysis of results test of cylindrical concrete on 7, 14 and 28 days that showed a 10, 20 and 30 percent weight replacement by Portland cement. The reviewed about this cement and sugarcane bagasse were realized. After that, a experimental study with analysis were realized. Test of granulometry were made in every material that we used for the concrete production. Based on these results, it was concluded that the sugarcane bagasse ash use is feasible, since the water/cement and the mass percentage replaced are appropriate.

  1. Synthesis and characterization of zeolite from coal ashes modified by cationic surfactant; Sintese e caracterizacao de zeolita de cinzas de carvao modificada por surfactante cationico

    Energy Technology Data Exchange (ETDEWEB)

    Fungaro, D.A.; Borrely, S.I., E-mail: dfungaro@ipen.br [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2012-01-15

    Zeolite synthesized from coal fly ash was modified with different concentrations (2 and 20 mmol.L{sup -1}) of hexadecyltrimethylammonium bromide (HDTMA-Br). The Non-Modified Zeolite (NMZ) and Surfactant-Modified Zeolites (SMZ) were characterized by X-ray fluorescence spectrometry, X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy, thermogravimetric analysis, among others. The SMS presented negative charge probably due to the formation of a partial bilayer of HDTMA on exchangeable active sites on the external surface of NMZ. A decrease in surface area was observed for SMZ as compared to NMZ indicating zeolite surface coverage with HDTMA-Br molecules. The crystalline nature of the zeolite remained intact after adsorption of surfactant and heating for drying. FTIR analysis indicated that there were no significant changes in the structure of the zeolite after adsorption of surfactant. (author)

  2. Comparison between rice husk ash and commercial silica as filler in polymeric composites; Comparacao de cinza de casca de arroz e silica comercial como carga em compositos polimericos

    Energy Technology Data Exchange (ETDEWEB)

    Fernandes, I.J.; Calheiro, D.; Santos, E.C.A. dos; Oliveira, R.; Rocha, T.L.A.C.; Moraes, C.A.M., E-mail: ijk.fernandes@gmail.com [Universidade do Vale do Rio dos Sinos (UNISINOS), Sao Leopoldo, RS (Brazil). Pos-Graduacao em Engenharia Civil

    2014-07-01

    The use of rice husk ash (RHA) as filler in polymeric materials has been studied in different polymers. Research reported that RHA may successfully replace silica. The silica production process using ore demands high energy input and produces considerable amounts of waste. Therefore, the replacement of silica by RHA may be economically and environmentally advantageous, reducing environmental impact and adding value to a waste material. In this context, this study characterizes and compares RHA of different sources (travelling grate reactor and fluidized bed reactor) with commercially available silicas to assess performance as filler in polymeric materials. Samples were characterized by X-ray fluorescence, loss on ignition, X-ray diffraction, grain size, specific surface area and specific weight. The results show that RHA may be used as a filler in several polymeric materials.(author)

  3. Análise da influência das cinzas do bagaço de cana-de-açúcar no comportamento mecânico de concretos

    Directory of Open Access Journals (Sweden)

    Z. L. M. Sampaio

    Full Text Available O concreto é o segundo produto mais consumido no mundo e a incorporação de resíduos agroindustriais, tais como a Cinza do Bagaço da Cana-de-açúcar (CBC, a este material pode apresentar soluções para o aproveitamento de subprodutos de outros setores, reduzindo assim o impacto ambiental. O objetivo principal deste trabalho foi de analisar o comportamento mecânico dos concretos contendo incorporações de CBC de três diferentes espécies de cana-de-açúcar (SP911049, RB92579 e SP816949, mediante ensaios de consistência, índice de vazios, absorção, porosidade total e resistência à compressão. Foram produzidos 13 corpos de prova para o concreto padrão e para cada teor de incorporação de CBC (10%, 20% e 30% das três variedades coletadas, totalizando 130 amostras de concreto. Foi empregado o traço 1:2:3 (cimento:areia:brita em relação à massa do cimento com um fator água/cimento de 0,532 e 1% de aditivo Tec Mult 400 também baseado na massa do cimento. Os resultados mostraram que a variedade da cana-de-açúcar, utilizada na produção das CBC, influenciou no comportamento mecânico dos concretos resultantes. Todos os concretos com adição de CBC apresentaram uma redução de no mínimo 10% nas propriedades relacionadas à permeabilidade e um incremento na resistência à compressão de até 20% em relação ao concreto padrão aos 28 dias. O uso da CBC em adição ao concreto se mostrou uma opção bastante viável na melhoria das propriedades mecânicas do concreto para uso em construção civil em geral e também uma destinação adequada ao subproduto agro-industrial.

  4. Use of rice husk ash as only source of silica in the formation of mesoporous materials Emprego da cinza da casca de arroz como única fonte de sílica na formação de materiais mesoporosos

    Directory of Open Access Journals (Sweden)

    A. J. Schwanke

    2013-03-01

    Full Text Available This paper reports the synthesis of molecular sieves similar to MCM-41 using rice husk ash as only source of silica. For comparison purposes, a standard synthesis was performed using aerosil 200 commercial silica. The rice husk silica was obtained by heating treatment at 600 ºC and leaching for 2 h in reflux with HCl 1mol.L-1 and used in the synthesis. The samples prepared were characterized by N2 adsorption, X-ray diffraction (XRD, scanning electronic microscopy (SEM and thermogravimetric analysis (TG. By type-IV adsorption isotherms, the formation of mesoporous materials was observed. XRD showed the formation of hexagonal unidirectional pore materials similar to MCM-41. By SEM, it could be observed that the rice husk has fibrous aspect and that synthesis using calcined and leached rice husk did not react entirely because silica was only partially dissolved.Este trabalho relata o estudo da síntese de peneiras moleculares semelhantes à MCM-41, empregando cinza da casca de arroz como única fonte de sílica. Para critérios de comparação uma síntese foi realizada com sílica comercial aerosil 200. A sílica da casca de arroz foi obtida mediante tratamento térmico a 600 ºC e lixiviação em refluxo por 2 h com HCl 1 mol/L e empregada na síntese. As amostras preparadas foram caracterizadas por adsorção de N2, difração de raios X, microscopia eletrônica de varredura (MEV e termogravimetria. Por meio das isotermas de adsorção, do tipo IV, observa-se a formação de material mesoporoso. Nos difratogramas de raios X é identificada a formação hexagonal unidirecional de poros, indicando que material apresenta semelhanças com a MCM-41. Por MEV observa-se que a casca de arroz possui aspecto fibroso e que a síntese empregando a casca de arroz calcinada e lixiviada não reagiu na sua totalidade devido a dissolução parcial da sílica.

  5. Aproveitamento de águas pluviais e o reúso de águas cinzas em edifícios residenciais de Brasília – parte 1: reduções no consumo de água

    Directory of Open Access Journals (Sweden)

    Daniel Sant'Ana

    2013-12-01

    Full Text Available Sistemas de aproveitamento de águas pluviais(AAP e de reúso de águas cinzas (RAC sãoestratégias de gestão descentralizadas capazesde promover reduções na demanda urbanade água. No entanto, pouco se sabe sobre suaviabilidade para uma implementação estratégicaem edificações. Para avaliar a viabilidadedesses sistemas hidráulicos em edificações residenciais,é fundamental compreender o usodesagregado de água para estimar o potencialde redução no consumo de água e verificar aaplicabilidade, os custos e os benefícios deadaptação predial. O presente artigo foca nacaracterização dos usos-finais de água do estoquede edificações residenciais de Brasília, e naidentificação do potencial de redução do consumode água promovido por diferentes sistemasAAP e RAC. Em geral, resultados demonstramum alto índice de consumo de água em chuveiros(23,0%, máquinas de lavar roupa (21,4% edescargas sanitárias (15,3%. Já os usos externosde água representam uma pequena fraçãodo consumo predial total (3,5%. Em média, resultadosindicam que as áreas de cobertura sãocapazes de fornecer águas pluviais para suprir48% da demanda em lavagem de roupas, 60%em descargas sanitárias e 100% em lavagem depisos e irrigação. Sistemas de reúso de águascinzas apresentaram maiores valores de economiade água em lavagem de roupas (2.541m³/ano e descarga sanitárias (1.815 m³/ano.Ambos sistemas AAP e RAC são capazes depromover reduções equivalente a 811 m³/ano.

  6. O Desenvolvimento do Turismo Náutico e a sua Ligação com a Observação do Boto-Cinza (sotalia guianensis na Região de Cananéia, Litoral Sul do Estado de São Paulo

    Directory of Open Access Journals (Sweden)

    Gislaine de Fátima Filla

    2010-07-01

    Full Text Available Resumo O boto-cinza é hoje um grande atrativo e gerador de renda para a região estuarina de Cananéia. O crescimento da infra-estrutura turística desta região parece estar intimamente relacionado com o crescimento do interesse em observar estes animais na natureza. Assim, um levantamento das atuais estruturas de alojamento e capacidade náutica da região foi feito nos meses de verão de 2007, através de visitas aos estabelecimentos e entrevistas com pessoas atuantes no turismo náutico. Ficou evidente que as estruturas de alojamento e o uso das embarcações nas três ilhas do estuário variam de acordo com as diferentes categorias de turistas que freqüentam esta região e com o objetivo de suas viagens. Ainda, foi possível notar que a organização em associações e parcerias garantiu um crescimento maior da atividade de observação do boto-cinza, a qual deve ser acompanhada com cuidado para que seja desenvolvida de forma otimizada, conservando os animais e seu habitat natural. Palavras-chaves: boto-cinza; sotalia guianensis; turismo náutico; Cananéia Abstract The estuarine dolphin (sotalia guianensis is a big attraction and money maker for the Cananéia estuary region. The increased tourist infrastructure of the region seems to be directly related to the growing interest to observe these animals in loco. Therefore, a survey was done to asses the present boarding and nautical capacity of the region during the summer months of 2007, by means of visits to the establishments and interviews with the people working with nautical tourism. It was evident that the boarding structures and the use of ships on the three islands of the estuary vary according to the different type of tourists that visit the area and their reasons for the trip. Even so, it was possible to note that organized associations and partnerships guaranteed a larger growth and activity of estuarine dolphin observation, which must be carefully followed to ensure proper

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

    Directory of Open Access Journals (Sweden)

    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.

  8. Durabilidad del hormigón: Acción de disoluciones de sulfato de calcio y de sulfato de magnesio sobre un cemento Portland de alta resistencia inicial. Influencia de la adición de escorias y de cenizas volantes

    Directory of Open Access Journals (Sweden)

    Sagrera-Moreno, José Luis

    1990-09-01

    Full Text Available This article —included on a long time ICCET Investigation Program— studies the mechanical resistances variation, to flexure, of the 1 X 1 X 6 cm mortar samples (1:3 made with high initial resistance cement and with several slags addition (cement/slag = 85/15 - 65/35 - 40/60 and 30/70 with high furnace slag and a fly ash (with selected characteristies when they were submited after the cured period (1 day at 100% R.H. and 21 days inside filtered potable water to the action of the gypsum saturated solution, four magnesium sulphate solutions with the next concentrations (3.22 - 32.20 - 128.80 and 515.20 g/l of MgS044.7H20, gypsum saturated solution with 3.22 g/l MgS04.7H20 a gypsum saturated solution with 32.20 g/l MgSO4. 7H2O and, moreover, filtered potable water, during 56-90-180- 360 - 540 - 720 - 900 and 1080 days. The results obtained have produced a clasification accord to the mechanical behaviour to flexure of the cement n. ° 1 and the mixed cement n.° 1/slag and cement n.° 1/fly ash, front to the agressive solutions mentioned.

    En este artículo —que forma parte de un Proyecto de Investigación del ICCET, a largo plazo— se estudia la variación de las resistencias mecánicas, a flexotracción, de las probetas de mortero (1:3 de 1 X 1 X 6 cm hechas con un cemento portland de alta resistencia inicial y con sus mezclas (cemento/adición = 85/15 - 65/35 - 40/60 y 30/70, en peso con una escoria de horno alto y una ceniza volante (seleccionadas de entre diversas muestras por sus características cuando se someten después del período de curado (1 día en cámara húmeda y 21 días bajo agua potable filtrada a la acción de una disolución saturada de yeso, cuatro disoluciones de sulfato de magnesio con distintas concentraciones (3,22 - 32,20 - 128,80 y 515,20 g/l de MgSO4.7 H2O, una disolución saturada de yeso con 3,22 g/l de MgS04

  9. Determinação simultânea dos teores de cinza e proteína em farinha de trigo empregando NIRR-PLS e DRIFT-PLS Simultaneous determination of ash content and protein in wheat flour using infrared reflection techniques and partial least-squares regression (PLS

    Directory of Open Access Journals (Sweden)

    Marco Flôres Ferrão

    2004-09-01

    Full Text Available As técnicas de espectroscopia por reflexão no infravermelho próximo (NIRRS e por reflexão difusa no infravermelho médio com transformada de Fourier (DRIFTS foram empregadas com o método de regressão multivariado por mínimos quadrados parciais (PLS para a determinação simultânea dos teores de proteína e cinza em amostras de farinha de trigo da variedade Triticum aestivum L. Foram coletados espectros no infravermelho em duplicata de 100 amostras, empregando-se acessórios de reflexão difusa. Os teores de proteína (8,85-13,23% e cinza (0,330-1,287%, empregados como referência, foram determinados pelo método Kjeldhal e método gravimétrico, respectivamente. Os dados espectrais foram utilizados no formato log(1/R, bem como suas derivadas de primeira e segunda ordem, sendo pré-processados usando-se os dados centrados na média (MC ou escalados pela variância (VS ou ambos. Cinqüenta e cinco amostras foram usadas para calibração e 45 para validação dos modelos, adotando-se como critério de construção os valores mínimos do erro padrão de calibração (SEC e do erro padrão de validação (SEV. Estes valores foram inferiores a 0,33% para proteína e a 0,07% para cinza. Os métodos desenvolvidos apresentam como vantagens a não agressão ao ambiente, bem como permitem uma determinação direta, simultânea, rápida e não destrutiva dos teores de proteína e cinza em amostras de farinha de trigo.Partial Least Square (PLS multivariate calibration associated to Near Infrared Reflection Spectroscopy (NIRRS or Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS were used to establish methods for simultaneous determination of protein and ash content on commercial wheat flour samples of Triticum aestivum L. Duplicate spectra of 100 samples with protein content between 8.85-13.23% (Kjeldahl method and ash content between 0.330-1.287% (gravimetric method were employed to build calibration methods. The spectra were used

  10. Modos de ruptura e padrões de fissuração de vigas pré-moldadas de concreto armado geopolimérico: Estudo de caso

    OpenAIRE

    Pires, Eliane Fernandes Côrtes; Azevedo, Cláudio Mesquita Coutinho de; Mounzer, Elie Chahdan; Silva, Felipe José da; Darwish, Fathi Aref Ibrahim

    2018-01-01

    RESUMO Esse trabalho apresenta um estudo comparativo do comportamento mecânico de vigas pré-moldadas de concreto armado convencional (CCP), fabricadas por uma empresa local e de concretos geopolimérico de metacaulim (CCG) e geopolimérico com 20% de cinza volante e silicato de cinza de casca de arroz (CCG-20CVCCA), como matrizes substitucionais. Os resultados mostraram que os concretos geopoliméricos apresentaram comportamento similar ao do CCP, na mesma classe de resistência do concreto, taxa...

  11. Valorização de resíduos em materiais de construção

    OpenAIRE

    Pinho, Paulo André Martins de

    2014-01-01

    O trabalho desenvolvido nesta dissertação enquadra-se no objetivo geral de valorização de resíduos provenientes de unidades de pasta Kraft de eucalipto, nomeadamente cinzas de fundo e cinzas volantes das fornalhas de biomassa. Atualmente uma das mais graves preocupações das sociedades dos países desenvolvidos passa por encontrar um destino adequado para resíduos gerados. A construção civil, aliada com a indústria da produção de pasta e papel que por ano gera milhares de toneladas de resídu...

  12. Análise dos níveis de cinza de 4 resinas compostas micro-híbridas utilizando um sistema de radiografia digital direto =Analisys of the gray scale levels for 4 micro-hibrids composite resins using a radiograph direct digital system

    Directory of Open Access Journals (Sweden)

    Pereira, Ary Salazar Rubim et al.

    2005-01-01

    Full Text Available O objetivo deste estudo foi analisar os diferentes níveis de cinza de quatro resinas compostas micro-híbridas, através do sistema de radiografia digital direto Sens-a-Ray. As resinas utilizadas foram: Concept (Vigodent, Herculite (Sybron/Kerr, IntenS (Ivoclar Vivadent e Z 100 (3MESPE, na cor A2. Foram confeccionadas 3 placas de acrílico para cada espessura 2, 3 e 4 mm que possuíam dimensões de um filme periapical. Em todas as placas foram feitos quatro orifícios eqüidistantes com 4 mm de diâmetro onde as resinas compostas foram inseridas, esses orifícios apresentavam 4mm de diâmetro. As amostras foram radiografadas a 30 cm de distância foco-filme do sistema Sens-a-Ray por 0,8 segundo com aparelho de Raios-X (Dabi Atlante de 70 kV e 10 mA. A quantidade dos níveis de cinza, das resinas, foi aferida em pixels pelo sistema Sens-a-Ray. Foram obtidas as seguintes médias: Concept – 2 mm com 79,6; 3 mm com 85,4 e 4 mm com 96,7; Herculite – 2 mm com 65,1; 3 mm com 72,5 e 4 mm com 85,4; IntenS – 2 mm com 138,5; 3 mm com 147,3 e 4 mm com 153,7; Z 100 – 2 mm com 133,5; 3 mm com 143,8 e 4 mm com 150,6. Após os resultados foram submetidos ao teste estatístico ANOVA-Tukey com um nível de significância (p 0,05. A colorimetria foi utilizada para ilustrar a densidade óptica dos compósitos, com cores vermelho, verde e azul, representando, respectivamente do mais radiopaco para o menos radiopaco. Podemos concluir que na medida em que aumentou a espessura das placas os níveis de cinza também aumentaram. A resina Herculite apresentou os menores níveis de cinza, diferindo estatisticamente das demais. As resinas IntenS e Z 100 apresentaram maiores níveis de cinza que as demais. The aim of this study was analysed the different gray scale levels for 4 micro-hybrids composite resins, throught the direct digital radiography device, Sens-a-Ray. The composites used in this study were: Concept (Vigodent, Herculite (Sybron/Kerr, IntenS (Ivoclar

  13. Flying starlings, PET and the evolution of volant dinosaurs.

    Science.gov (United States)

    Gold, Maria Eugenia Leone; Schulz, Daniela; Budassi, Michael; Gignac, Paul M; Vaska, Paul; Norell, Mark A

    2016-04-04

    Birds have evolved behavioral and morphological adaptations for powered flight. Many aspects of this transition are unknown, including the neuroanatomical changes that made flight possible [1]. To understand how the avian brain drives this complex behavior, we utilized positron emission tomography (PET) scanning and the tracer (18)F-fluorodeoxyglucose (FDG) to document regional metabolic activity in the brain associated with a variety of locomotor behaviors. FDG studies are typically employed in rats [2] though the technology has been applied to birds [3]. We examined whole-brain function in European Starlings (Sturnus vulgaris), trained to fly in a wind tunnel while metabolizing the tracer. Drawing on predictions from early anatomical studies [4], we hypothesized increased metabolic activity in the Wulst and functionally related visual brain regions during flight. We found that flight behaviors correlated positively with entopallia and Wulst activity, but negatively with thalamic activity. Copyright © 2016 Elsevier Ltd. All rights reserved.

  14. Seasonal and daily patterns of group size, cohesion and activity of the estuarine dolphin, Sotalia guianensis (P.J. van Bénéden (Cetacea, Delphinidae, in southern Brazil Padrões sazonais e diários do tamanho de grupo, coesão e atividade do boto-cinza, Sotalia guianensis (P.J. van Bénéden (Cetacea, Delphinidae, no sul do Brasil

    Directory of Open Access Journals (Sweden)

    Fábio G. Daura-Jorge

    2005-12-01

    Full Text Available The resident population of estuarine dolphin, Sotalia guianensis (P.J. van Bénéden, 1864, in Norte Bay, Santa Catarina, southern Brazil, was studied from 2000 to 2003. Systematic one-day cruises were undertaken aboard a 5 m sail boat equipped with an outboard motor. Applying the focal-group method, information such as geographical position, predominant behavioural patterns, group size, cohesion index and the presence of calves, were registered at every five-minute interval, totalling 198 hours of direct observation of the dolphins. The estuarine dolphin used preferential areas for each behavioural pattern. The mean group size was approximately 29 individuals, and the presence of calves occurred throughout the entire year, but with a significant increase in the warm seasons. The frequency of behavioural patterns and group size varied according to season and time of day, and were strongly associated. The frequency of moving behaviours increased in the cold seasons and along the day. The seasonal variation in the moving behaviours suggest the requirement of a larger area in the cold seasons, probably related to seasonal fluctuations in the abundance of dominant prey items. Higher group sizes were observed while dolphins were foraging. The cohesion index also varied according to the behaviour. Our results showed that group organization and behavioural patterns of this estuarine dolphin population are probably linked to daily and seasonal environment cycles, and also possibly to the condition of being at the furthest southern limit of distribution of the species.A população residente de boto-cinza, Sotalia guianensis (P.J. van Bénéden, 1864, da Baía Norte, Santa Catarina, sul do Brasil, foi estudada de 2000 a 2003. Foram realizados cruzeiros sistemáticos de um dia, a bordo de um veleiro de 5 m equipado com motor de popa. Utilizando o método de grupo-focal, informações como posição geográfica, padrão comportamental predominante, tamanho

  15. Utilization of rice husk ash as filler for polyamide 6 and ionizing radiation effect studies on this composite;Utilizacao da cinza da casca de arroz como carga em matriz de poliamida 6 submetida a radiacao ionizante

    Energy Technology Data Exchange (ETDEWEB)

    Ferro, Waldir Pedro

    2009-07-01

    In order to improve the dimensional stability, as well as, electrical, mechanical and thermal properties of polymers, new filler to this purpose has been developed. The mos applied filler to propitiate the features previously mentioned are the glass and carbon fibers, the mineral filler as the calcium carbonate, the talc and the micro glass sphere. The main aim of this work was to study the rice husk ash as filler for polyamide 6 and ionizing radiation effect studies on this composite, irradiated by electron beam at different doses, since it is constituted of at least 90% of silicon dioxide, and compared with the talc which is the most applied mineral filler. This comparison was made from a compound made through the refined rice husk ash and the polyamide 6 (PA 6), which is one of the main engineering plastic with applications in several productive areas. The samples were injected and irradiated in a electron accelerator. Afterwards, their mechanical and thermal properties were measured. It was also inject automotive parts to verify the processing of the PA 6 with CCA. The results showed that the use of the rice husk ash as filler for polyamide 6 composite is technically and economically viable. The irradiation of the studied composite (PA 6 with 30% of rice husk ash) did not provide any improvement for the mechanical and thermal properties previously appraised. (author)

  16. Feeding associations between Guiana dolphins, Sotalia guianensis (Van Bénèden, 1864 and seabirds in the Lagamar estuary, Brazil Associações de alimentação entre o boto-cinza (Sotalia guianensis (Van Bénèden, 1864 e aves marinhas no estuário do Lagamar, Brasil

    Directory of Open Access Journals (Sweden)

    MCO. Santos

    2010-02-01

    Full Text Available The main objective of the present study was to describe the characteristics regarding interactions between Guiana dolphins, Sotalia guianensis and seabirds in feeding associations in two distinct areas of the Lagamar estuary, Brazil. Boat-based surveys directed towards photo-identification studies of S. guianensis were conducted in the Cananéia Estuary (CE (25° 01' S and 47° 55' W from July 2004 to March 2008, as well as in the Paranaguá Estuarine Complex (PEC (25° 24' S and 48° 24' W from April 2006 to February 2008. On all occasions when seabirds were observed engaging in multi-species feeding associations with S. guianensis, data on species involved and their numbers were gathered. From 435 observed groups of S. guianensis in the CE, 38 (8.7% involved interactions with seabirds. In the PEC, from the 286 observed groups, 32 (11.2% involved the mentioned interactions. The following seabirds were observed in feeding associations with S. guianensis: Fregata magnificens, Sula leucogaster, Phalacrocorax brasilianus, and Sterna sp. In the CE, S. leucogaster was more commonly observed in feeding associations with Guiana dolphins (χ2 = 22.84; d.f. = 3, p O objetivo principal do presente estudo foi de descrever as características a respeito das associações de alimentação entre o boto-cinza, Sotalia guianensis, e aves marinhas em duas áreas distintas do estuário do Lagamar, Brasil. Investigações efetuadas a partir de embarcação e direcionadas a estudos de foto-identificação de S. guianensis foram conduzidas no Estuário de Cananéia (EC (25° 01' S e 47° 55' O entre julho de 2004 e março de 2008, bem como no Complexo Estuarino de Paranaguá (CEP (25° 24' S e 48° 24' O entre abril de 2006 e fevereiro de 2008. Em todas as ocasiões em que aves marinhas foram observadas em associações de alimentação multiespecífica com S. guianensis, dados sobre as espécies envolvidas e seus números foram obtidos. Dos 435 grupos de S

  17. Hospital Compare

    Data.gov (United States)

    U.S. Department of Health & Human Services — Hospital Compare has information about the quality of care at over 4,000 Medicare-certified hospitals across the country. You can use Hospital Compare to find...

  18. Efeito do chumbo sobre a fertilização artificial e incubação de ovos de jundiá cinza (Rhamdia quelen = The effect of lead on artificial fertilization and incubation of gray jundiá (Rhamdia quelen eggs

    Directory of Open Access Journals (Sweden)

    Cleonice Cristina Hilbig

    2008-04-01

    Full Text Available A poluição no meio aquático afeta o potencial reprodutivo de várias espécies de peixes. Diante disso, o presente experimento foi conduzido com o objetivo de avaliar os efeitos causados pela contaminação da água utilizada no processo de fertilização artificial e incubação inicial de ovos de jundiá cinza (Rhamdia quelen por chumbo. Foram realizados dois ensaios, os quais foram distribuídos em delineamento experimental inteiramente casualizado, compostos por seis tratamentos, com quatro e seis repetições, para o primeiro eo segundo ensaio, respectivamente. O primeiro ensaio consistiu na contaminação da água utilizada no processo de fertilização artificial, com os níveis de 0,00; 0,01; 0,02; 0,03; 0,04 e0,05 mg de PB L-1, e incubação dos ovos em água limpa. O segundo ensaio utilizou os níveis de contaminação de 0,00; 0,15; 0,30; 0,45; 0,60 e 0,75 mg de PB L -1 de água utilizada nos processos de fertilização e de incubação dos ovos. Observou-se que apenas no segundo ensaio houve efeito (p Aquatic environmental pollution affects the reproductive potential of various species of fish. The present experiment was carried out to evaluate the effect of lead contamination of the water used in artificial fertilization and initial egg incubation of gray jundiá (Rhamdia quelen. Two assays were carried out distributed inrandomly experimental designs, composed by six treatments, with four and six replications, for the first and second assays, respectively. The first assay consisted of the contamination of artificial fertilization water with 0.00; 0.01; 0.02; 0.03; 0.04 and 0.05 mg of Pb L-1 and egg incubation in pure water. The second assay consisted of the contamination of artificial fertilization water and egg incubation water with 0.00; 0.15; 0.30; 0.45; 0.60 and 0.75 mg ofPb L-1. Only the second assay was affected (p < 0.05 by the treatments, showing a “plateau” tendency until 0.25 mg of Pb L-1. A linear reduction of the

  19. Physician Compare

    Data.gov (United States)

    U.S. Department of Health & Human Services — Physician Compare, which meets Affordable Care Act of 2010 requirements, helps you search for and select physicians and other healthcare professionals enrolled in...

  20. >INFLUENCIA DE LAS CARACTERÍSTICAS DEL RELLENO MINERAL EN LA RESISTENCIA DE UNA MEZCLA ASFÁLTICA INFLUÊNCIA DAS CARACTERÍSTICAS DO RECH EADO MINERAL NA RESISTÊNCIA DE UMA MISTURA DE ASFALTO INFLUENCE OF CHARACTERISTICS OF MINERAL FILLER IN THE RESISTANCE OF ASPHALT MIXTURE

    Directory of Open Access Journals (Sweden)

    ÓSCAR JAVIER REYES

    2009-07-01

    Full Text Available El objetivo principal de esta investigación fue determinar el efecto en la resistencia a tracción indirecta de reemplazar el relleno mineral por cemento, cal y ceniza volante con diferentes porcentajes. El estudio se inició con la caracterización de los materiales (agregados, asfaltos, cal, cemento y ceniza volante, seguido de la determinaci ón del porcentaje óptimo de asfalto mediante el método Marshall. Se seleccionaron para el estudio la granulometría MD10 y el asfalto con penetración 60/70, así mismo se sustituyó el relleno mineral en porcentajes de 0, 25, 50, 75 y 100. Se encontró que existe un incremento en la resistencia del 58 % al reemplazar el 100 % de relleno mineral por cal, del 22 % al sustituir el 50 % de relleno por ceniza volante y el 5 % al reemplazar el 75 % por cemento. Con respecto a la deformación de las probetas, para todos los porcentajes de sustitución de cal y cemento, la mezcla soporta mayor deformación para la carga máxima, mientras para el reemplazo de ceniza volante, sólo al 100 % de reemplazo aumenta la deformación con la carga máxima.O objetivo principal desta pesquisa foi determinar o efeito na resistência à tração indireta de substituir o recheado mineral por cimento, cal e cinza volante a diferentes percentagens. O estudo se iniciou com a caracteriza ção dos materiais (áridos, asfaltos, cal, cimento e cinza volante, seguido da determinação da percentagem ótima de asfalto mediante o método Marshall. Selecionou-se para o estudo a granulometria MD10 e o asfalto com penetração 60/70, assim mesmo se substituiu o recheado mineral às percentagens de 0, 25, 50, 75 e 100. Encontrou-se que existe um aumento na resistência de 58 % ao substituir 100 % supérfluo mineral por cal, de 22 % ao substituir 50 % de recheado por cinza volante e 5 % ao substituir 75 % por cimento. Com relação à deformação das provetas, para todas as percentagens de substituição de cal e cimento, a mistura

  1. Comparative Genomics

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education; Volume 11; Issue 8. Comparative Genomics - A Powerful New Tool in Biology. Anand K Bachhawat. General Article Volume 11 Issue 8 August 2006 pp 22-40. Fulltext. Click here to view fulltext PDF. Permanent link:

  2. Comparative Advantage

    DEFF Research Database (Denmark)

    Zhang, Jie; Jensen, Camilla

    2007-01-01

    that are typically explained from the supply-side variables, the comparative advantage of the exporting countries. A simple model is proposed and tested. The results render strong support for the relevance of supply-side factors such as natural endowments, technology, and infrastructure in explaining international...

  3. Comparative perspectives

    African Journals Online (AJOL)

    IT

    Ideology, policy and implementation: Comparative perspectives from two ... how both political as well as particular language ideologies play a major role in influencing and ..... attitudes as a field of research, many scholars still draw on the concept of .... The data for this study were collected through the use of questionnaires ...

  4. Betões de elevado desempenho de custo reduzido utilizando materiais correntes

    OpenAIRE

    Camões, Aires; Aguiar, J. L. Barroso de; Rocha, Patrício; Jalali, Said; Pereira, J. C.

    1999-01-01

    Para a produção de betões de elevado desempenho (BED) é genericamente aceite que são necessários materiais criteriosamente seleccionados, obrigando assim a um acréscimo significativo do custo inicial dos BED quando confrontados com betões correntes. Este trabalho pretende abordar duas características: possibilidade de produzir betões de elevado desempenho que incorporam materiais considerados correntes, nomeadamente cinzas volantes com teor de inqueimados superior ao máximo regulamentar e ine...

  5. Video Comparator

    International Nuclear Information System (INIS)

    Rose, R.P.

    1978-01-01

    The Video Comparator is a comparative gage that uses electronic images from two sources, a standard and an unknown. Two matched video cameras are used to obtain the electronic images. The video signals are mixed and displayed on a single video receiver (CRT). The video system is manufactured by ITP of Chatsworth, CA and is a Tele-Microscope II, Model 148. One of the cameras is mounted on a toolmaker's microscope stand and produces a 250X image of a cast. The other camera is mounted on a stand and produces an image of a 250X template. The two video images are mixed in a control box provided by ITP and displayed on a CRT. The template or the cast can be moved to align the desired features. Vertical reference lines are provided on the CRT, and a feature on the cast can be aligned with a line on the CRT screen. The stage containing the casts can be moved using a Boeckleler micrometer equipped with a digital readout, and a second feature aligned with the reference line and the distance moved obtained from the digital display

  6. Distribuição geográfica de pequenos mamíferos não voadores nas bacias dos rios Araguaia e Paraná, região centro-sul do Brasil Geographic distribution of small non-volant mammals in the Araguaia and Paraná basins, south-central region of Brazil

    Directory of Open Access Journals (Sweden)

    Nilton C. Cáceres

    2008-06-01

    biogeográficos. A Serra dos Caiapós pode ter sido uma barreira geográfica para algumas espécies de pequenos mamíferos em face da retração e expansão das florestas ocorridas no passado.We collected small mammals in two hydrographic basins in central Brazil, namely the Paraná and Araguaia basins, with the aim of examining the composition of forest dwelling small mammal species and to compare their geographic distributions. Fourteen sites were sampled, eight in the Paraná basin and six in the Araguaia basin. A total of 20 species of small mammals was registered (8 marsupials and 12 rodents, 16 of them in live traps (5,253 trap-nights and eight in pitfalls (224 trap-nights, adding to a total of 161 captures of 139 individuals. The Paraná basin showed 16 species (trap-nights: 3,115 and 104 respectively and the Araguaia basin 11 species (trap-nights: 2,138 and 120 respectively, being both richness similar when the rarefaction method was applied. Seven (35% out of the 20 species recorded occurred in both basins. The marsupial Didelphis albiventris Lund, 1840 was the most abundant species. The marsupials species recorded were D. albiventris, Caluromys philander (Linnaeus, 1758, Cryptonanus cf. agricolai Voss, Lunde & Jansa, 2005, Gracilinanus agilis (Burmeister, 1854, G. microtarsus (Wagner, 1842, Lutreolina crassicaudata (Desmarest, 1804, Marmosa murina (Linnaeus, 1758, and Philander opossum (Linnaeus, 1758. The rodent species recorded were Akodon gr. cursor, Calomys tener (Winge, 1887, Nectomys rattus (Pelzen, 1883, N. squamipes (Brants, 1827, Oecomys bicolor (Tomes, 1860, Oryzomys maracajuensis Langguth & Bonvicino, 2002, Oryzomys cf. marinhus, O. megacephalus (Fischer, 1814, Oligoryzomys fornesi (Massoia, 1973, Oligoryzomys sp., Proechimys longicaudatus (Rengger, 1830 and P. roberti (Thomas, 1901. The range extension of some species is discussed, in addition to biogeographic considerations. The Caiapós Mountains may have been a geographic barrier for some small

  7. LES CERFS-VOLANTS OU LA MÉMOIRE HISTORIQUE DE ROMAIN GARY

    OpenAIRE

    Barkate , Jonathan

    2016-01-01

    International audience; Dédié à la mémoire, le dernier roman de Romain Gary rend un vibrant hommage à la Résistance et doit être lu comme un testament destiné à perpétuer le souvenir de ceux qui ont contribué à surmonter la honte des années d’occupation. La galerie de portraits de résistants vante la folie sacrée et le roman met en scène un triangle amoureux en miroir de la situation politique de 1939-1945.

  8. Mineralogical study of pozolanes from volant ashes, by X-ray diffractometry

    International Nuclear Information System (INIS)

    Kihara, Y.; Shukuzawa, J.K.; Zampieri, V.A.

    1984-01-01

    The study of pozzolans is increasing in the Portland cement industry, due to the advantages of their use, either technical or economical. The results of X-ray powder diffraction studies of fly ashes from thermoelectric usines from Figueiras (PR), Jorge Lacerda(SC), Charqueadas (RS) Sao Jeronimo (RS) and Presidente Medici (RS), all in Brazil, are reported. (Author) [pt

  9. SVVM. Scripta volant, verba manent «los escritos vuelan, las palabras quedan».

    Directory of Open Access Journals (Sweden)

    Alicia G. Hierro

    2016-11-01

    Full Text Available Dramaturgia para un discurso inédito de Miguel de Unamuno en París.El pasado año –con ocasión del octogésimo aniversario– tuvo lugar el «Acto de reinauguración del Colegio de España en París 1935-2015. Miguel de Unamuno revisitado», que reunió una serie de acciones performativas impulsadas por cuatro mujeres artistas: Mireya Martín Larumbe, María Martín Muñoz, María del Carmen Molina Barea y Alicia Grueso Hierro, sobre las palabras, inéditas hasta hacía poco, del escritor vasco. Recientemente, en septiembre de 2016, se ha publicado el audiolibro derivado de este trabajo a 20 voces por el Grupo de Performance Colesp, cuyo título, SVVM, recoge los diferentes episodios de la experiencia vivida. Partiendo de una idea de inauguración como «acto performativo del habla» (J. L. Austin, en el discurso oral se propuso la reflexión sobre la deconstrucción del lenguaje, el poder de los illocutionary acts y las implicaciones identitarias de la voz, entablando un diálogo con la arquitectura del Colegio de España y su resonancia pasada. Otros referentes conceptuales de la pieza remitieron a las prácticas experimentales de la vanguardia española de los años veinte y treinta, en especial, los «actos de reinauguración de monumentos», así como las derivas surrealistas o las manifestaciones situacionistas de los años sesenta.https://vimeo.com/user36467306Z

  10. Empleos de las cenizas volantes en la construcción

    Directory of Open Access Journals (Sweden)

    Jarrige, M. A.

    1959-10-01

    Full Text Available Not availableAntes de entrar en detalles sobre las aplicaciones, el autor da algunas indicaciones generales y un breve resumen de las condiciones de producción y características de las cenizas.

  11. AirCompare

    Data.gov (United States)

    U.S. Environmental Protection Agency — AirCompare contains air quality information that allows a user to compare conditions in different localities over time and compare conditions in the same location at...

  12. Comparative Test Case Specification

    DEFF Research Database (Denmark)

    Kalyanova, Olena; Heiselberg, Per

    This document includes the specification on the IEA task of evaluation building energy simulation computer programs for the Double Skin Facades (DSF) constructions. There are two approaches involved into this procedure, one is the comparative approach and another is the empirical one. In the comp....... In the comparative approach the outcomes of different software tools are compared, while in the empirical approach the modelling results are compared with the results of experimental test cases. The comparative test cases include: ventilation, shading and geometry....

  13. Use of heterogeneous CaO and SnO{sub 2} catalysts supported on rice husk ash to produce biodiesel; Emprego de catalisadores heterogeneos de CaO e SnO{sub 2} suportados em cinza de casca de arroz na obtencao de biodiesel

    Energy Technology Data Exchange (ETDEWEB)

    Soares, Ana Brigida [Instituto Federal do Espirito Santo, Vitoria, ES (Brazil); Silva, Paulo Roberto Nagipe da; Stumbo, Alexandre Moura, E-mail: nagipe@uenf.br [Laboratorio de Ciencias Quimicas, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, RJ (Brazil); Freitas, Jair C.C. [Departamento de Fisica, Centro de Ciencias Exatas, Universidade Federal do Espirito Santo, Vitoria, ES (Brazil)

    2012-07-01

    Silica obtained from rice husk after acid leaching and calcination was compared to commercial silica as a catalyst support. CaO and SnO{sub 2} catalysts were prepared by impregnation and tested in the transesterification of soybean oil and the esterification of oleic acid. CaO catalysts showed basic character and were the most active for transesterification, whereas SnO{sub 2} catalysts were acid and the most effective for esterification. In both cases the performances of the catalysts prepared with rice husk ash and commercial silica were similar. These results demonstrate that rice husk is a cost-effective and environmentally-friendly source of silica that can be used as a catalyst support. (author)

  14. Study of the rice husk ash utilization as filler polypropylene matrix and ionization radiation effect on this composite; Estudos da utilizacao da cinza de casca de arroz como carga em matriz de polipropileno e do efeito da radiacao ionizante sobre este composito

    Energy Technology Data Exchange (ETDEWEB)

    Alfaro, Eduardo de Faria

    2010-07-01

    In the first step of this work, it was evaluated the possibility of using rice husk ash as a filler in polypropylene (PP) making a comparison with talc which is the most used mineral filler in polymers. This comparison was made by using polypropylene with 20% rice husk ash as well as polypropylene with 20% talc measuring their properties. Despite the properties of the PP with 20% rice husk ash decreased compared with the composite of polypropylene with 20% talc it can be said that the rice husk ash can be used as filler for or other utilization less noble of PP . This way it is being given a destination for this residue that it is disposable in the environment contributing to its preservation, moreover reducing the product cost. This work had also as an aim to study the ionizing radiation effect in the properties of these composites. It was used the coupling agent, maleic anhydride , to verify a best sample homogenization. According to the results it can be said that PP is a semicrystalline polymer, and so it has its morphology modified when exposed to the irradiation process. This fact is due to the scission mechanisms of the polymeric chains which it is in compliance to the literature. (author)

  15. Dialysis Facility Compare

    Data.gov (United States)

    U.S. Department of Health & Human Services — Dialysis Facility Compare helps you find detailed information about Medicare-certified dialysis facilities. You can compare the services and the quality of care that...

  16. Approaching comparative company law

    OpenAIRE

    Donald, David C.

    2008-01-01

    This paper identifies some common errors that occur in comparative law, offers some guidelines to help avoid such errors, and provides a framework for entering into studies of the company laws of three major jurisdictions. The first section illustrates why a conscious approach to comparative company law is useful. Part I discusses some of the problems that can arise in comparative law and offers a few points of caution that can be useful for practical, theoretical and legislative comparative ...

  17. Synthesis of zeolites coal ash in surfactant modified in application and removal of orange 8 acid solution: study in batch, fixed bed column and evaluation ecotoxicological; Sintese de zeolitas de cinzas de carvao modificada por surfactante e aplicacao na remocao de acido laranja 8 de solucao aquosa: estudo em leito movel, coluna de leito fixo e avaliacao ecotoxicologica

    Energy Technology Data Exchange (ETDEWEB)

    Magdalena, Carina Pitwak

    2015-09-01

    In this study, synthesized zeolitic material from coal ash and modified cationic surfactant was used for removing the acid dye Orange 8 (AL8) by adsorption process using moving bed and fixed-bed column. The raw material and adsorbents were characterized by different techniques, such as X-ray diffraction, X-ray fluorescence spectroscopy, among others. The adsorption of AL8 was performed by moving bed in order to optimize the results when they are launched in a fixed bed. The effects of adsorption on zeolite AL8 were compared: (1) Effect of counterions Br{sup -} and Cl{sup -} surfactant used in the modification of the zeolite; (2) effect of type of coal ash used as raw material in the synthesis of zeolites (fly and bottom). The following adsorbents were used in the study: fly and bottom zeolite modified by surfactant hexadecyltrimethylammonium bromide (ZLMS-Br-Br and ZPMS-Br) and fly zeolite modified by surfactant hexadecyltrimethylammonium chloride (ZLMS-Cl). The pseudo-second-order kinetic described the adsorption of the dye on all adsorbents. The equilibrium time was reached 40, 60 and 120 min for ZLMS-Br, ZLMS-Cl and ZPMS-Br, respectively. The adsorption equilibrium was analyzed by the equations of the models of linear and nonlinear isotherms of Langmuir, Freundlich, Temkin and Dubinin- Radushkevivh (DR) and the criterion of best fit was evaluated using the error functions.The DR model was adjusted better to the experimental data for the system AL8 / ZLMS-Br, the Freundlich model for AL8 / ZLMS-Cl and Langmuir for AL8 / ZPMS. According to the Langmuir maximum adsorption capacity was 4.67, 1.48 and 1.38 mg g{sup -1} for ZLMS-Br, ZLMS-Cl and ZPMS-Br, in order. In studies employing fixed bed columns, the effects of inlet concentration (20- 30 mg L{sup -1}), flow rate (4.0 -5.3 mL min{sup -1}) and the bed height (5, 5 - 6.5 cm) above the breakthrough curves characteristics in the adsorption system were determined. The Adams-Bohart, Thomas, Yoon-Nelson models were

  18. Comparative Test Case Specification

    DEFF Research Database (Denmark)

    Kalyanova, Olena; Heiselberg, Per

     This document includes a definition of the comparative test cases DSF200_3 and DSF200_4, which previously described in the comparative test case specification for the test cases DSF100_3 and DSF200_3 [Ref.1]....... This document includes a definition of the comparative test cases DSF200_3 and DSF200_4, which previously described in the comparative test case specification for the test cases DSF100_3 and DSF200_3 [Ref.1]....

  19. Text File Comparator

    Science.gov (United States)

    Kotler, R. S.

    1983-01-01

    File Comparator program IFCOMP, is text file comparator for IBM OS/VScompatable systems. IFCOMP accepts as input two text files and produces listing of differences in pseudo-update form. IFCOMP is very useful in monitoring changes made to software at the source code level.

  20. ÉTUDE COMPARATIVE SUR L’ÉVOLUTION DE L’ALCOOLÉMIE AU COURS DU TEMPS

    Directory of Open Access Journals (Sweden)

    Madalina Toma

    2007-12-01

    Full Text Available La consommation excessive d’alcool éthylique est connue depuis longtemps comme très dangereuse pour la santé humaine. De plus, l’alcool au volant représente, après la vitesse excessive, la deuxième cause d’accidents mortels sur la route. Quoique autorisé au volant à faibles doses dans certains pays, l’alcool met toujours en danger la vie du chauffeur et de ses passagers. Le taux d’alcool dans le sang, pour la même quantité d’éthanol consommée, varie en fonction de différents facteurs physiologiques. Il existe à l’heure actuelle de nombreuses modalités d’estimer l’évolution de l’alcoolémie au cours du temps. Nous avons essayé de démontrer que cette évolution présente une forte variabilité, en fonction du sexe, de l’age et de la physiologie individuelle

  1. Mercury exposure in Munduruku Indians from the community of Sai Cinza, state of Para, Brazil

    International Nuclear Information System (INIS)

    Oliveira Santos, Elisabeth C. de; Maura de Jesus, Iracina; Camara, Volney e M.; Brabo, Edilson; Brito Loureiro, Edvaldo C.; Mascarenhas, Artur; Weirich, Judith; Ragio Luiz, Ronir; Cleary, David

    2002-01-01

    The objective of this cross-sectional study was to evaluate mercury exposure and health status among Munduruku Indians from the community of Sai inza, State of Para, Brazil. The population studied included 330 Indians, who submitted to a questionnaire, clinical exams, and collection of hair, blood, urine, and feces. Mercury was measured in hair and fish. Although no person was found to have overt mercury intoxication, the mean levels of mercury in hair were elevated (14.45 μg/g for children from 7 to 12 years ld, 15.70 μg/g for women between 14 and 44 years old, and 14.1 μg/g or the remaining population). Mercury levels in fish were below levels recommended by the World Health Organization, but rates of fish consumption ere high. These results place this indigenous population as a group under risk of mercury toxicity from the gold production

  2. Hospital Compare Data

    Data.gov (United States)

    U.S. Department of Health & Human Services — These are the official datasets used on the Medicare.gov Hospital Compare Website provided by the Centers for Medicare and Medicaid Services. These data allow you to...

  3. Towards Comparative Leadership

    DEFF Research Database (Denmark)

    Jensen, Merete Storgaard

    Globalization is the imitation and adaptation of knowledgesolutions or innovations, as they are diffused from one country to another” (Peter Jarvis 2007) Conducting comparative, educational research of school leadership that effects student achievement in an international perspective is of scient......Globalization is the imitation and adaptation of knowledgesolutions or innovations, as they are diffused from one country to another” (Peter Jarvis 2007) Conducting comparative, educational research of school leadership that effects student achievement in an international perspective...... is of scientific value in qualifying the international and national knowledgebase on effective school leadership. In a methodological perspective comparative analysis in an international setting creates specifically a scientific demand of comparability and a theory based leadership - framework to guide...... the empirical, qualitative research of effective leadership....

  4. Comparing Demonstratives in Kwa

    African Journals Online (AJOL)

    This paper is a comparative study of demonstrative forms in three K wa languages, ... relative distance from the deictic centre, such as English this and that, here and there. ... Mostly, the referents of demonstratives are 'activated' or at least.

  5. Home Health Compare

    Data.gov (United States)

    U.S. Department of Health & Human Services — Home Health Compare has information about the quality of care provided by Medicare-certified home health agencies throughout the nation. Medicare-certified means the...

  6. Nursing Home Compare Data

    Data.gov (United States)

    U.S. Department of Health & Human Services — These are the official datasets used on the Medicare.gov Nursing Home Compare Website provided by the Centers for Medicare and Medicaid Services. These data allow...

  7. Hospital Compare - Archived Data

    Data.gov (United States)

    U.S. Department of Health & Human Services — Hospital Compare is a consumer-oriented website that provides information on how well hospitals provide recommended care to their patients. This information can help...

  8. Home Health Compare Data

    Data.gov (United States)

    U.S. Department of Health & Human Services — These are the official datasets used on the Medicare.gov Home Health Compare Website provided by the Centers for Medicare and Medicaid Services. These data allow you...

  9. Nursing Home Compare

    Data.gov (United States)

    U.S. Department of Health & Human Services — The data that is used by the Nursing Home Compare tool can be downloaded for public use. This functionality is primarily used by health policy researchers and the...

  10. Comparative Climatic Data

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Comparative Climatic Data is a publication containing data tables of meteorological elements; the publication outlines the climatic conditions at major weather...

  11. Dialysis Facility Compare Data

    Data.gov (United States)

    U.S. Department of Health & Human Services — These are the official datasets used on the Medicare.gov Dialysis Facility Compare Website provided by the Centers for Medicare and Medicaid Services. These data...

  12. Comparing Political Communication

    OpenAIRE

    Pfetsch, Barbara; Esser, Frank

    2012-01-01

    This chapter describes the maturation of comparative political communications as a sub-discipline and defines its conceptual core. It then lays out the concept of “political communication system”. At the macro-level, this model captures the patterns of interaction between media and politics as social systems; at the micro-level it captures the interactions between media and political actors as individuals or organizations. Comparative research in this tradition focuses on the structure of pol...

  13. Comparing chess strategies

    OpenAIRE

    Kacz, Kristián

    2010-01-01

    The aim of this work is to provide an overview of approaches in computer chess. It designs and implements a chess engine for multiplayer network chess program ChessNet. Within the engine implements several search algorithms like Negamax, Alpha-beta, Negascout and points to their weaknesses. Adds a possibility to the ChessNet environment to compare chess engines. Compares implemented algorithms in terms of time complexity. Shows several factors wich we have to take into consideration during th...

  14. Competitive versus comparative advantage

    OpenAIRE

    Neary, J. Peter

    2002-01-01

    I explore the interactions between comparative, competitive and absolute advantage in a two-country model of oligopoly in general equilibrium. Comparative advantage always determines the direction of trade, but both competitive and absolute advantage affect resource allocation, trade patterns and trade volumes. Competitive advantage in the sense of more home firms drives foreign firms out of marginal sectors but also makes some marginal home sectors uncompetitive. Absolute advantage in the se...

  15. Comparative approaches to gentrification

    Science.gov (United States)

    Phillips, Martin; Smith, Darren P

    2018-01-01

    The epistemologies and politics of comparative research are prominently debated within urban studies, with ‘comparative urbanism’ emerging as a contemporary lexicon of urban studies. The study of urban gentrification has, after some delay, come to engage with these debates, which can be seen to pose a major challenge to the very concept of gentrification. To date, similar debates or developments have not unfolded within the study of rural gentrification. This article seeks to address some of the challenges posed to gentrification studies through an examination of strategies of comparison and how they might be employed within a comparative study of rural gentrification. Drawing on Tilly (Big structures Large Processes Huge Comparisons. New York: Russell Sage), examples of four ‘strategies of comparison’ are identified within studies of urban and rural gentrification, before the paper explores how ‘geographies of the concept’ and ‘geographies of the phenomenon’ of rural gentrification in the United Kingdom, United States and France may be investigated using Latour’s (Pandora’s Hope. London: Harvard University Press) notion of ‘circulatory sociologies of translation’. The aim of our comparative discussion is to open up dialogues on the challenges of comparative studies that employ conceptions of gentrification and also to promote reflections of the metrocentricity of recent discussions of comparative research. PMID:29657708

  16. Comparing Political Journalism

    DEFF Research Database (Denmark)

    Comparing Political Journalism is a systematic, in-depth study of the factors that shape and influence political news coverage today. Using techniques drawn from the growing field of comparative political communication, an international group of contributors analyse political news content drawn...... Comparing Political Journalism offers an unparalleled scope in assessing the implications for the ongoing transformation of Western media systems, and addresses core concepts of central importance to students and scholars of political communication world-wide....... from newspapers, television news, and news websites from 16 countries, to assess what kinds of media systems are most conducive to producing quality journalism. Underpinned by key conceptual themes, such as the role that the media are expected to play in democracies and quality of coverage...

  17. Contesting Citizenship: Comparative Analyses

    DEFF Research Database (Denmark)

    Siim, Birte; Squires, Judith

    2007-01-01

    importance of particularized experiences and multiple ineequality agendas). These developments shape the way citizenship is both practiced and analysed. Mapping neat citizenship modles onto distinct nation-states and evaluating these in relation to formal equality is no longer an adequate approach....... Comparative citizenship analyses need to be considered in relation to multipleinequalities and their intersections and to multiple governance and trans-national organisinf. This, in turn, suggests that comparative citizenship analysis needs to consider new spaces in which struggles for equal citizenship occur...

  18. Comparative Nivkh Dictionary

    DEFF Research Database (Denmark)

    Fortescue, Michael David

    This dictionary undertakes to reconstruct the lexis and morphology of the Nivkh proto-language by marshaling and organizing all the data available in published form on the contemporary dialects. It builds upon a considerable body of descriptive and comparative work carried out by scholars who have...... World is a subject of continuing interest to both linguists and anthropologists. The dictionary does not address this question directly. Reconstructing the proto-language is an essential step, however, to any further comparative work – in particular to sorting out the relationship between Nivkh...

  19. Comparing chemical reaction networks

    DEFF Research Database (Denmark)

    Cardelli, Luca; Tribastone, Mirco; Tschaikowski, Max

    2017-01-01

    We study chemical reaction networks (CRNs) as a kernel model of concurrency provided with semantics based on ordinary differential equations. We investigate the problem of comparing two CRNs, i.e., to decide whether the solutions of a source and of a target CRN can be matched for an appropriate...... choice of initial conditions. Using a categorical framework, we extend and unify model-comparison approaches based on dynamical (semantic) and structural (syntactic) properties of CRNs. Then, we provide an algorithm to compare CRNs, running linearly in time with respect to the cardinality of all possible...... comparisons. Finally, using a prototype implementation, CAGE, we apply our results to biological models from the literature....

  20. Comparative Contract Law & Economics

    NARCIS (Netherlands)

    Kovac, M.

    2008-01-01

    This work is a search for deeper understanding of established differences and similarities among compared legal systems. The application of economically inspired optimal model rule as a uniform term of comparison provides additional insights into some of the most often discussed legal issues. The

  1. Comparing East and West

    DEFF Research Database (Denmark)

    Razeto, Anna

    2014-01-01

    This chapter explores the archaeological and literary evidence for marketplaces and urban forms connected to the manufacturing of bricks and metalworking in the capital cities of the contemporary empires of Rome and Han China (ca. 200 BC-200 AD). The comparative analysis of the physical aspects...... was involved in the social and political processes that characterized the production of space in ancient cities....

  2. Ebolavirus comparative genomics

    DEFF Research Database (Denmark)

    Jun, Se-Ran; Leuze, Michael R.; Nookaew, Intawat

    2015-01-01

    The 2014 Ebola outbreak in West Africa is the largest documented for this virus. To examine the dynamics of this genome, we compare more than 100 currently available ebolavirus genomes to each other and to other viral genomes. Based on oligomer frequency analysis, the family Filoviridae forms...

  3. Comparing contracting performance

    DEFF Research Database (Denmark)

    Lindholst, Andrej Christian

    . Hypotheses are suggested for the role of culture, competition, contracts, capabilities and collaboration for contracting performance between and across the countries. Arguments are tested against data from on four comparable national surveys of private delivery of park and road maintenance services in local...

  4. Dermatologia comparativa Comparative Dermatology

    Directory of Open Access Journals (Sweden)

    Hiram Larangeira de Almeida Jr

    2005-06-01

    Full Text Available Demonstra-se o quadro exuberante dos angiofibromas faciais em paciente do sexo masculino, de 32 anos, com esclerose tuberosa, os quais podem ser comparados com amoras.The impressive facial angiofibromas, from a 32 year-old male paciente, with the classical features of tuberous sclerosis, were compared with mulberries.

  5. Comparative cardiac imaging

    International Nuclear Information System (INIS)

    Brundage, B.H.

    1990-01-01

    This book is designed to compare all major cardiac imaging techniques. All major imaging techniques - including conventional angiography, digital angiography, echocardiography and Doppler imaging, conventional radioisotope techniques, computed tomography, and magnetic resonance imaging - are covered in this text as they apply to the major cardiovascular disorders. There is brief coverage of positron emission tomography and an extensive presentation of ultrafast computed tomography

  6. Comparing Harmonic Similarity Measures

    NARCIS (Netherlands)

    de Haas, W.B.; Robine, M.; Hanna, P.; Veltkamp, R.C.; Wiering, F.

    2010-01-01

    We present an overview of the most recent developments in polyphonic music retrieval and an experiment in which we compare two harmonic similarity measures. In contrast to earlier work, in this paper we specifically focus on the symbolic chord description as the primary musical representation and

  7. Comparative Genomics of Eukaryotes.

    NARCIS (Netherlands)

    Noort, V. van

    2007-01-01

    This thesis focuses on developing comparative genomics methods in eukaryotes, with an emphasis on applications for gene function prediction and regulatory element detection. In the past, methods have been developed to predict functional associations between gene pairs in prokaryotes. The challenge

  8. Comparative International Management

    NARCIS (Netherlands)

    Sorge, Arndt; Noorderhaven, Niels; Koen, Carla

    2015-01-01

    The use of comparisons to explain, analyze and understand social and economic phenomena is recognized as a valuable social science tool. This textbook deals with the differences in management and organization between nations and their effects on multinational enterprises. In comparing management

  9. Comparative Political Communication Research

    NARCIS (Netherlands)

    de Vreese, C.H.; Kenski, K.; Jamieson, K.H.

    2017-01-01

    This chapter provides an overview of comparative political communication research (CPCR). CPCR is a growing field since there is wide acknowledgement that many questions are not answered satisfactorily with single case studies. The chapter explains why political communication researchers should care

  10. Comparative and Translatorly

    Directory of Open Access Journals (Sweden)

    Anna Rosen Guercio

    2011-12-01

    Full Text Available World literature’s natural home is comparative literature, a discipline born from and shaped by, as Vilashini Cooppan elegantly puts it, “scholarly engagements with the categories of migration, exile, diaspora, and globalization” (15. However, world literature has frequently been framed as a problem for the discipline, in large part because of its dependence on the ever-vexing and still mistrusted specter of translation. In light of the long-standing anxiety toward both world literature and translation, I propose here that comparatists do ourselves a terrible disservice if we do not urgently take up the questions raised by this disciplinary tension. Translation – in all of its attendant struggles with ethics, aesthetics, appropriation, authority – is not the problem, but, rather, should be understood as a key critical lens for comparative and world literature.In order to establish academia’s frustration with this subject, one need look no further than the “Three Reports to the America Comparative Literature Association on ‘Professional Standards’” (dating from 1965, 1975, and 1993, which return repeatedly to the problem of reading translated literature, circling around it with intense ambivalence. The moral of their story seems to be that translated texts are integral to comparative literature at the same time that they threaten its existence by undermining disciplinary exclusivity in foreign language expertise and by shining a sort of spotlight on all that literature which comparative literature may sometimes “condone” (as one of the reports puts it but to which it does not often actively attend. Even Goethe had Western European languages and literatures firmly in mind when he coined the term, “Weltliteratur.” Translations can’t help but point up the limits of the “four [likely European] languages” proposed as minimal standards for graduate students by the Green and Bernheimer reports, and on the strength of

  11. Comparing apples and pears?

    DEFF Research Database (Denmark)

    Waite, Sue; Bølling, Mads; Bentsen, Peter

    2016-01-01

    Using a conceptual model focused on purposes, aims, content, pedagogy, outcomes, and barriers, we review and interpret literature on two forms of outdoor learning: Forest Schools in England and udeskole in Denmark. We examine pedagogical principles within a comparative analytical framework and co...... to pedagogical principles are necessary to ensure better alignment of purpose and practice to elicit specific outcomes and enable comparison between different types.......Using a conceptual model focused on purposes, aims, content, pedagogy, outcomes, and barriers, we review and interpret literature on two forms of outdoor learning: Forest Schools in England and udeskole in Denmark. We examine pedagogical principles within a comparative analytical framework...... and consider how adopted pedagogies reflect and refract the culture in which they are embedded. Despite different national educational and cultural contexts, English Forest Schools and Danish udeskole share several commonalities within a naturalistic/progressive pedagogical tradition; differences appear...

  12. On comparative inquiry

    DEFF Research Database (Denmark)

    Moutsios, Stavros

    of self‐reflexivity and self-questioning in the Greek polis gave also rise to the genuine interest in the institutions of the cultural ‘other’. Impartiality in the study of the others’ institutions started in Greece and it was closely associated with the signification that physis (nature) should......The paper explores the origins of comparative studies, which as it argues are located in Ancient Greece. Greece is not only the place where the school was born, but it is also there where the interest in and inquiry of the institutions of other societies, including education, emerged. The rise...... to know better their own society through comparison. Cross-cultural examination in this regard informed further the Greeks’ self-reflexivity. By going through a set of historical sources and contemporary literature, the paper will elaborate on the emergence of cross-cultural and comparative inquiry...

  13. Banking: shop and compare.

    Science.gov (United States)

    O'Brien, Jennifer A; DeJarnette, Sherry

    2014-01-01

    There are many reasons to take a critical look at the practice's banking relationship(s)--technology advancements, security measures, improvements in available services, recent banking enhancements designed specifically for medical practices, the impact of the financial crisis on bank ratings and stability, changing practice needs, opportunities for operational automation at the practice--and it is just simply smart to periodically evaluate and compare the features, pricing, and potential savings offered by vendors.

  14. Josephson comparator switching time

    Energy Technology Data Exchange (ETDEWEB)

    Herr, Quentin P; Miller, Donald L; Przybysz, John X [Northrop Grumman, Baltimore, MD (United States)

    2006-05-15

    Comparator performance can be characterized in terms of both sensitivity and decision time. Delta-sigma analogue-to-digital converters are tolerant of sensitivity errors but require short decision time due to feedback. We have analysed the Josephson comparator using the numerical solution of the Fokker-Planck equation, which describes the time evolution of the ensemble probability distribution. At balance, the result is essentially independent of temperature in the range 5-20 K. There is a very small probability, 1 x 10{sup -14}, that the decision time will be longer than seven single-flux-quantum pulse widths, defined as Phi{sub 0}/(I{sub c}R{sub n}). For junctions with a critical current density of 4.5 kA, this decision time is only 20 ps. Decision time error probability decreases rapidly with lengthening time interval, at a rate of two orders of magnitude per pulse width. We conclude that Josephson comparator performance is quite favourable for analogue-to-digital converter applications.

  15. Electrochemical Batteries: Flywheels for temporary energy storage; Baterias electromecanicas: volantes de inercia para el almacenamiento temporal de energia

    Energy Technology Data Exchange (ETDEWEB)

    Pena Alzola, R.; Sebastian Fernandez, R.

    2008-07-01

    In the Electromechanical batteries (EMB) a flywheel stores mechanical energy that interchanges in form of electrical energy by means of an electrical machine with a bidirectional power converter. EMB are suitable whenever numerous charge and recharge cycles (hundred of thousands) are needed with medium to high power (kW to MW) during short periods (seconds). The materials of the flywheel, the type of the electrical machine, the type of the bearings and the atmosphere inside the housing determine the energy efficiency of the EMB. EMB are commercially available with more than a dozen of manufacturers. Amongst the applications of BEM are: uninterrupted power supplies, hybrid power systems, power grids feeding trains, hybrid vehicles and space satellites. (Author) 15 refs.

  16. An assessment of non-volant terrestrial vertebrates response to wind farms--a study of small mammals.

    Science.gov (United States)

    Łopucki, Rafał; Mróz, Iwona

    2016-02-01

    The majority of studies on the effects of wind energy development on wildlife have been focused on birds and bats, whereas knowledge of the response of terrestrial, non-flying vertebrates is very scarce. In this paper, the impact of three functioning wind farms on terrestrial small mammal communities (rodents and shrews) and the population parameters of the most abundant species were studied. The study was carried out in southeastern Poland within the foothills of the Outer Western Carpathians. Small mammals were captured at 12 sites around wind turbines and at 12 control sites. In total, from 1200 trap-days, 885 individuals of 14 studied mammal species were captured. There was no difference in the characteristics of communities of small mammals near wind turbines and within control sites; i.e. these types of sites were inhabited by a similar number of species of similar abundance, similar species composition, species diversity (H' index) and species evenness (J') (Pielou's index). For the two species with the highest proportion in the communities (Apodemus agrarius and Microtus arvalis), the parameters of their populations (mean body mass, sex ratio, the proportion of adult individuals and the proportion of reproductive female) were analysed. In both species, none of the analysed parameters differed significantly between sites in the vicinity of turbines and control sites. For future studies on the impact of wind turbines on small terrestrial mammals in different geographical areas and different species communities, we recommend the method of paired 'turbine-control sites' as appropriate for animal species with pronounced fluctuations in population numbers.

  17. Comparative risk analysis

    International Nuclear Information System (INIS)

    Niehaus, F.

    1988-01-01

    In this paper, the risks of various energy systems are discussed considering severe accidents analysis, particularly the probabilistic safety analysis, and probabilistic safety criteria, and the applications of these criteria and analysis. The comparative risk analysis has demonstrated that the largest source of risk in every society is from daily small accidents. Nevertheless, we have to be more concerned about severe accidents. The comparative risk analysis of five different energy systems (coal, oil, gas, LWR and STEC (Solar)) for the public has shown that the main sources of risks are coal and oil. The latest comparative risk study of various energy has been conducted in the USA and has revealed that the number of victims from coal is 42 as many than victims from nuclear. A study for severe accidents from hydro-dams in United States has estimated the probability of dam failures at 1 in 10,000 years and the number of victims between 11,000 and 260,000. The average occupational risk from coal is one fatal accident in 1,000 workers/year. The probabilistic safety analysis is a method that can be used to assess nuclear energy risks, and to analyze the severe accidents, and to model all possible accident sequences and consequences. The 'Fault tree' analysis is used to know the probability of failure of the different systems at each point of accident sequences and to calculate the probability of risks. After calculating the probability of failure, the criteria for judging the numerical results have to be developed, that is the quantitative and qualitative goals. To achieve these goals, several systems have been devised by various countries members of AIEA. The probabilistic safety ana-lysis method has been developed by establishing a computer program permit-ting to know different categories of safety related information. 19 tabs. (author)

  18. Comparative pharmacognosy of Pashanbhed

    Directory of Open Access Journals (Sweden)

    Poonam Verma

    2014-01-01

    Full Text Available Background: Pashanbhed is a commercially available diuretic and lithotropic drug, used to treat renal problems. It is a controversial name as it is assigned to various plants such as Bergenia ligulata, Kalanchoe pinnata, Coleus aromaticus and Rotula aquatica. Objective: To perform the comparative preliminary phytochemical screening, diuretic activity, and thin layer chromatography (TLC finger printing profile of three plants (B. ligulata, C. aromaticus, and K. pinnata, most commonly used as Pashanbhed. Materials and Methods: Diuretic potential of methanolic extract (ME of three plants were evaluated at two dose levels (500 and 1,000 mg/kg p.o., using normal Wistar rats (Lipschitz method. Furosemide (20 mg/kg p.o. was used as a standard drug. The effect on urine output and electrolyte changes were measured for 24 h and compared. All MEs were screened preliminarily for their constituents and their TLC finger printing profiles were prepared. One-way analysis of variance (ANOVA followed by Bonferroni′s multiple comparison test. P < 0.05 was considered statistically significant. Results: The MEs of all three plants have shown diuresis in normal rats. However, in intercomparison of the ME C. aromaticus (1,000 mg/kg p.o. produced more significant diuresis (P < 0.05 and electrolyte excretion compared to other test groups, the effect was at par with furosemide. The ME of these plants showed presence of alkaloids, glycosides, steroids, terpenoids, saponins, flavonoids, etc. Conclusion: The ME of C. aromaticus (1,000 mg/kg p.o. has showed highest diuretic action (4.2 among the tested extracts. This suggests the use of C. aromaticus leaves as "Pashanbhed"; the most effective diuretic drug.

  19. Comparative pharmacognosy of Pashanbhed

    Science.gov (United States)

    Verma, Poonam; Gauttam, Vinod; Kalia, Ajudhia N.

    2014-01-01

    Background: Pashanbhed is a commercially available diuretic and lithotropic drug, used to treat renal problems. It is a controversial name as it is assigned to various plants such as Bergenia ligulata, Kalanchoe pinnata, Coleus aromaticus and Rotula aquatica. Objective: To perform the comparative preliminary phytochemical screening, diuretic activity, and thin layer chromatography (TLC) finger printing profile of three plants (B. ligulata, C. aromaticus, and K. pinnata), most commonly used as Pashanbhed. Materials and Methods: Diuretic potential of methanolic extract (ME) of three plants were evaluated at two dose levels (500 and 1,000 mg/kg p.o.), using normal Wistar rats (Lipschitz method). Furosemide (20 mg/kg p.o.) was used as a standard drug. The effect on urine output and electrolyte changes were measured for 24 h and compared. All MEs were screened preliminarily for their constituents and their TLC finger printing profiles were prepared. One-way analysis of variance (ANOVA) followed by Bonferroni's multiple comparison test. P < 0.05 was considered statistically significant. Results: The MEs of all three plants have shown diuresis in normal rats. However, in intercomparison of the ME C. aromaticus (1,000 mg/kg p.o.) produced more significant diuresis (P < 0.05) and electrolyte excretion compared to other test groups, the effect was at par with furosemide. The ME of these plants showed presence of alkaloids, glycosides, steroids, terpenoids, saponins, flavonoids, etc. Conclusion: The ME of C. aromaticus (1,000 mg/kg p.o.) has showed highest diuretic action (4.2) among the tested extracts. This suggests the use of C. aromaticus leaves as “Pashanbhed”; the most effective diuretic drug. PMID:24948861

  20. Comparative Genome Viewer

    International Nuclear Information System (INIS)

    Molineris, I.; Sales, G.

    2009-01-01

    The amount of information about genomes, both in the form of complete sequences and annotations, has been exponentially increasing in the last few years. As a result there is the need for tools providing a graphical representation of such information that should be comprehensive and intuitive. Visual representation is especially important in the comparative genomics field since it should provide a combined view of data belonging to different genomes. We believe that existing tools are limited in this respect as they focus on a single genome at a time (conservation histograms) or compress alignment representation to a single dimension. We have therefore developed a web-based tool called Comparative Genome Viewer (Cgv): it integrates a bidimensional representation of alignments between two regions, both at small and big scales, with the richness of annotations present in other genome browsers. We give access to our system through a web-based interface that provides the user with an interactive representation that can be updated in real time using the mouse to move from region to region and to zoom in on interesting details.

  1. Comparative Studies for What?

    Directory of Open Access Journals (Sweden)

    Pedro Guedes de Carvalho

    2017-12-01

    Full Text Available ISCPES stands for International Society for Comparative Physical Education and Sports and it is going to celebrate its 40th anniversary in 2018. Since the beginning (Israel 1978 the main goals of the Society were established under a worldwide mind set considering five continents and no discrimination of any kind. The founders wanted to compare Physical Education and Sports across the world, searching for the best practices deserving consideration and applied on the purpose of improving citizen quality of life. The mission still stands for “Compare to learn and improve”. As all the organizations lasting for 39 years, ISCPES experienced several vicissitudes, usually correlated with world economic cycles, social and sports changes, which are in ISS journal articles - International Sport Studies. ISS journal is Scopus indexed, aiming to improve its quality (under evaluation to reach more qualified students, experts, professionals and researchers; doing so it will raise its indexation, which we know it is nowadays a more difficult task. First, because there are more journals trying to compete on this academic fierce competitive market; secondly, because the basic requirements are getting more and more hard to gather in the publishing environment around Physical Education and Sports issues. However, we can promise this will be one of our main strategic goals. Another goal I would like to address on this Editorial is the language issue. We have this second strategic goal, which is to reach most of languages spoken in different continents; besides the English language, we will reach Chinese, Spanish and Portuguese speaking countries. For that reason, we already defined that all the abstracts in English will be translated into Chinese, Spanish and Portuguese words so people can find them on any search browser. That will expand the demand for our journal and articles, increasing the number of potential readers. Of course this opportunity, given by

  2. Comparing solar energy alternatives

    Energy Technology Data Exchange (ETDEWEB)

    White, J R

    1984-01-01

    The paper outlines a computational procedure for comparing the merits of alternative processes to convert solar radiation to heat, electrical power, or chemical energy. The procedure uses the ratio of equipment investment to useful work as an index. Comparisons with conversion counterparts based on conventional fuels are also facilitated by examining this index. The procedure is illustrated by comparisons of (1) photovoltaic converters of differing efficiencies; (2) photovoltaic converters with and without focusing concentrators; (3) photovoltaic conversion plus electrolysis vs photocatalysis for the production of hydrogen; (4) photovoltaic conversion plus plasma arcs vs photocatalysis for nitrogen fixation. Estimates for conventionally-fuelled processes are included for comparison. The reasons why solar-based concepts fare poorly in such comparisons are traced to the low energy density of solar radiation and its low stream time factor resulting from the limited number of daylight hours available and clouds obscuring the sun.

  3. Comparing solar energy alternatives

    Energy Technology Data Exchange (ETDEWEB)

    White, J R

    1984-01-01

    This paper outlines a computational procedure for comparing the merits of alternative processes to convert solar radiation to heat, electrical power, or chemical energy. The procedure uses the ratio of equipment investment to useful work as an index. Comparisons with conversion counterparts based on conventional fuels are also facilitated by examining this index. The procedure is illustrated by comparisons of (1) photovoltaic converters of differing efficiencies; (2) photovoltaic converters with and without focusing concentrators; (3) photovoltaic conversion plus electrolysis vs photocatalysis for the production of hydrogen; (4) photovoltaic conversion plus plasma arcs vs photocatalysis for nitrogen fixation. Estimates for conventionally-fuelled processes are included for comparison. The reasons why solar-based concepts fare poorly in such comparisons are traced to the low energy density of solar radiation and its low stream time factor resulting from the limited number of daylight hours available and clouds obscuring the sun. 11 references.

  4. Comparing new anticoagulants.

    Science.gov (United States)

    Wooten, James M

    2012-12-01

    For years, the pharmaceutical industry has been trying to find a safe and effective drug to replace warfarin. Although warfarin is an effective anticoagulant, its pharmacology, adverse effects, and risk profiles dictate that patients taking this medication must be monitored judiciously. The US Food and Drug Administration has approved two drugs for commercial use, dabigatran and rivaroxaban, that will compete directly with warfarin for use in specific indications. Because of direct marketing to patients, physicians are being asked to comment on these new medications. This brief review illustrates the data available for the two new drugs when compared to warfarin for the specified indications. For some patients, these drugs may be highly beneficial and offer an excellent alternative to warfarin. For others, warfarin may still be the preferred drug.

  5. Comparative RNA genomics

    DEFF Research Database (Denmark)

    Backofen, Rolf; Gorodkin, Jan; Hofacker, Ivo L.

    2018-01-01

    Over the last two decades it has become clear that RNA is much more than just a boring intermediate in protein expression. Ancient RNAs still appear in the core information metabolism and comprise a surprisingly large component in bacterial gene regulation. A common theme with these types of mostly...... small RNAs is their reliance of conserved secondary structures. Large scale sequencing projects, on the other hand, have profoundly changed our understanding of eukaryotic genomes. Pervasively transcribed, they give rise to a plethora of large and evolutionarily extremely flexible noncoding RNAs...... that exert a vastly diverse array of molecule functions. In this chapter we provide a—necessarily incomplete—overview of the current state of comparative analysis of noncoding RNAs, emphasizing computational approaches as a means to gain a global picture of the modern RNA world....

  6. Manipulator comparative testing program

    International Nuclear Information System (INIS)

    Draper, J.V.; Handel, S.J.; Sundstrom, E.; Herndon, J.N.; Fujita, Y.; Maeda, M.

    1986-01-01

    The Manipulator Comparative Testing Program examined differences among manipulator systems from the United States and Japan. The manipulator systems included the Meidensha BILARM 83A, the Model M-2 of Central Research Laboratories Division of Sargent Industries (CRL), and the GCA Corporation PaR Systems Model 6000. The site of testing was the Remote Operations Maintenance Demonstration (ROMD) facility, operated by the Fuel Recycle Division in the Consolidated Fuel Reprocessing Program at the Oak Ridge National Laboratory (ORNL). In all stages of testing, operators using the CRL Model M-2 manipulator had consistently lower times to completion and error rates than they did using other machines. Performance was second best with the Meidensha BILARM 83A in master-slave mode. Performance with the BILARM in switchbox mode and the PaR 6000 manipulator was approximately equivalent in terms of criteria recorded in testing. These data show no impact of force reflection on task performance

  7. Comparative Failure in Science

    Directory of Open Access Journals (Sweden)

    Barney Glaser, PhD, Hon Phd

    2017-06-01

    Full Text Available A perennial problem for some scientists is their feeling of comparative failure as scientists. This problem becomes clearer if we consider two major sources of this feeling that are inherent in the vary nature of scientific work. (i In science, strong emphasis is placed on the achievement of recognition; (ii the typical basic scientist works in a community filled with “great men” who have made important and decisive discoveries in their respective fields; they are the acknowledge guiding lights. These esteemed scientists, who have attained honors beyond the reach of most of their colleagues, tend to become models for those who have been trained by them or who have worked under them. As Eiduson has put it in her recent psychological study of basic research scientists “Scientists: are idols-oriented.”

  8. Comparative Failure in Science

    Directory of Open Access Journals (Sweden)

    Barney G. Glaser, Ph.D., Hon. Ph.D

    2008-03-01

    Full Text Available A perennial problem for some scientists is their feeling of comparative failure as scientists. This problem becomes clearer if we consider two major sources of this feeling that are inherent in the vary nature of scientific work. (i In science, strong emphasis is placed on the achievement of recognition; (ii the typical basic scientist works in a community filled with “great men” who have made important and decisive discoveries in their respective fields; they are the acknowledge guiding lights. These esteemed scientists, who have attained honors beyond the reach of most of their colleagues, tend to become models for those who have been trained by them or who have worked under them. As Eiduson has put it in her recent psychological study of basic research scientists “Scientists: are idols-oriented.”

  9. Comparability of prostate trials

    DEFF Research Database (Denmark)

    Suciu, S; Sylvester, R; Iversen, P

    1993-01-01

    The present overview of advanced prostate cancer required the identification of randomized clinical trials studying the question of maximal androgen blockade versus the classic castration therapy. The heterogeneity of the trials concerned the type of castration (surgical or chemical) and the type...... of antiandrogen (flutamide, Anandron, or cyproterone acetate) added to castration. This paper reviews the different types of heterogeneity that might exist among trials that are involved in the overview: study design, randomization procedure, treatment evaluation, statistical evaluation, and data maturity....... In order to overcome these various types of heterogeneity and to compare like with like, the treatment comparison should be stratified a posteriori by question (i.e., type of castration or type of anti-androgen studied) and by study. In this way, one may draw valid conclusions. Of course, those trials...

  10. Operations dashboard: comparative study

    Science.gov (United States)

    Ramly, Noor Nashriq; Ismail, Ahmad Zuhairi; Aziz, Mohd Haris; Ahmad, Nurul Haszeli

    2011-10-01

    In this present days and age, there are increasing needs for companies to monitor application and infrastructure health. Apart from having proactive measures to secure their application and infrastructure, many see monitoring dashboards as crucial investment in disaster preparedness. As companies struggle to find the best solution to cater for their needs and interest for monitoring their application and infrastructure's health, this paper summarizes the studies made on several known off-the-shelf operations dashboard and in-house developed dashboard. A few criteria of good dashboard are collected from previous studies carried out by several researchers and rank them according to importance and business needs. The finalized criteria that will be discussed in later sections are data visualization, performance indicator, dashboard personalization, audit capability and alert/ notification. Comparative studies between several popular dashboards were then carried out to determine whether they met these criteria that we derived from the first exercise. The findings hopefully can be used to educate and provide an overview of selecting the best IT application and infrastructure operations dashboard that suit business needs, thus become the main contribution of this paper.

  11. Comparative genomic hybridization.

    Science.gov (United States)

    Pinkel, Daniel; Albertson, Donna G

    2005-01-01

    Altering DNA copy number is one of the many ways that gene expression and function may be modified. Some variations are found among normal individuals ( 14, 35, 103 ), others occur in the course of normal processes in some species ( 33 ), and still others participate in causing various disease states. For example, many defects in human development are due to gains and losses of chromosomes and chromosomal segments that occur prior to or shortly after fertilization, whereas DNA dosage alterations that occur in somatic cells are frequent contributors to cancer. Detecting these aberrations, and interpreting them within the context of broader knowledge, facilitates identification of critical genes and pathways involved in biological processes and diseases, and provides clinically relevant information. Over the past several years array comparative genomic hybridization (array CGH) has demonstrated its value for analyzing DNA copy number variations. In this review we discuss the state of the art of array CGH and its applications in medical genetics and cancer, emphasizing general concepts rather than specific results.

  12. Comparative Supreme Justice

    Directory of Open Access Journals (Sweden)

    Ditlev Tamm

    2011-12-01

    Full Text Available This article deals with the great variety of Supreme Courts in the world today and presents some selected courts. Supreme Courts are found in most countries both as only apex courts or in a courts’ system where also supreme administrative courts or constitutional courts are found. The starting point is the variation of supreme justice in the Nordic countries where one apex court is the system of Denmark and Norway whereas administrative courts are found in Sweden and Finland. Constitutional courts stem from the European tradition and are most abundant in Europe and in countries with a civil law system but especially in Africa they are also found in common law countries. Mexico is mentioned as a specific example of a Supreme Court that has taken upon itself to be a main player in the endeavour to communicate the law to a general audience. The article is a presentation with samples of what is going to be a project on comparative supreme justice in which the position of supreme courts in the various states, the recruitment scheme and competence of the courts and other such factors will be analyzed on a global basis.

  13. Comparative waste forms study

    International Nuclear Information System (INIS)

    Wald, J.W.; Lokken, R.O.; Shade, J.W.; Rusin, J.M.

    1980-12-01

    A number of alternative process and waste form options exist for the immobilization of nuclear wastes. Although data exists on the characterization of these alternative waste forms, a straightforward comparison of product properties is difficult, due to the lack of standardized testing procedures. The characterization study described in this report involved the application of the same volatility, mechanical strength and leach tests to ten alternative waste forms, to assess product durability. Bulk property, phase analysis and microstructural examination of the simulated products, whose waste loading varied from 5% to 100% was also conducted. The specific waste forms investigated were as follows: Cold Pressed and Sintered PW-9 Calcine; Hot Pressed PW-9 Calcine; Hot Isostatic Pressed PW-9 Calcine; Cold Pressed and Sintered SPC-5B Supercalcine; Hot Isostatic pressed SPC-5B Supercalcine; Sintered PW-9 and 50% Glass Frit; Glass 76-68; Celsian Glass Ceramic; Type II Portland Cement and 10% PW-9 Calcine; and Type II Portland Cement and 10% SPC-5B Supercalcine. Bulk property data were used to calculate and compare the relative quantities of waste form volume produced at a spent fuel processing rate of 5 metric ton uranium/day. This quantity ranged from 3173 L/day (5280 Kg/day) for 10% SPC-5B supercalcine in cement to 83 L/day (294 Kg/day) for 100% calcine. Mechanical strength, volatility, and leach resistance tests provide data related to waste form durability. Glass, glass-ceramic and supercalcine ranked high in waste form durability where as the 100% PW-9 calcine ranked low. All other materials ranked between these two groupings

  14. Ebolavirus comparative genomics

    Science.gov (United States)

    Jun, Se-Ran; Leuze, Michael R.; Nookaew, Intawat; Uberbacher, Edward C.; Land, Miriam; Zhang, Qian; Wanchai, Visanu; Chai, Juanjuan; Nielsen, Morten; Trolle, Thomas; Lund, Ole; Buzard, Gregory S.; Pedersen, Thomas D.; Wassenaar, Trudy M.; Ussery, David W.

    2015-01-01

    The 2014 Ebola outbreak in West Africa is the largest documented for this virus. To examine the dynamics of this genome, we compare more than 100 currently available ebolavirus genomes to each other and to other viral genomes. Based on oligomer frequency analysis, the family Filoviridae forms a distinct group from all other sequenced viral genomes. All filovirus genomes sequenced to date encode proteins with similar functions and gene order, although there is considerable divergence in sequences between the three genera Ebolavirus, Cuevavirus and Marburgvirus within the family Filoviridae. Whereas all ebolavirus genomes are quite similar (multiple sequences of the same strain are often identical), variation is most common in the intergenic regions and within specific areas of the genes encoding the glycoprotein (GP), nucleoprotein (NP) and polymerase (L). We predict regions that could contain epitope-binding sites, which might be good vaccine targets. This information, combined with glycosylation sites and experimentally determined epitopes, can identify the most promising regions for the development of therapeutic strategies. This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan). PMID:26175035

  15. Comparative Healthcare: Diabetes Mellitus.

    Directory of Open Access Journals (Sweden)

    Dr Mohammed Ali

    2009-05-01

    Full Text Available In the third in this series of ‘comparative healthcare’ medical practitioners explore the approach to diabetes inBangaldesh and Australia respectively. The social and medical consequences of this chronic conditionare highlighted through the approach to patients at various stages of the disease from two nationalperspectives. An astonishing 7% of the 153 million people are reported to have diabetes in Bangladesh. Manyremain undiagnosed. Delays in diagnosis or management of diabetes have life limiting consequences for thosewho can ill afford private health care in the poorer nation. Screening and early intervention appear to bedenied to many in the developing country. The context is very different with Australians very fortunate to havea coordinated primary health care sector. The outlook for Bangladeshis with uncontrolled diabetes or withtreatable sequela would be unacceptable in Australia. At every stage in the disease trajectory the doctorsemphasise the importance of life style modification, a particular challenge in affluent Australia with its growingincidence of life style related pre morbid conditions in an increasingly sedentary population. A corner stone ofthe support of people with diabetes is the role of nurses and allied health professionals. With a fundedcommitment to multidisciplinary care in the community people with diabetes in Australia have access tosupport closer to home whereas those in Bangladesh remain heavily dependent on specialist, hospital basedservices. One can only speculate how Bangladesh will cope as its population ages and there are an everincreasing proportion of people who require urgent and expensive medical interventions. At the very leastthere is a strong case for greater investment in primary care especially to limit the economic consequences ofdiabetes and other chronic conditions. Finally as in other articles in this series we would like to emphasise that,the views expressed are those of the authors and do

  16. Non-comparative and comparative advertising in oligopolistic markets

    OpenAIRE

    Alipranti, Maria; Mitrokostas, Evangelos; Petrakis, Emmanuel

    2016-01-01

    We study firms' advertising strategies in an oligopolistic market in which both non-comparative and comparative advertising are present. We show that in equilibrium firms mix over the two types of advertising, with the intensity of comparative advertising exceeding that of non-comparative advertising; moreover, that the intensity of comparative increases relatively to non-comparative advertising as market competition intensifies. Interestingly, the use of comparative advertising may lead to h...

  17. Avaliação comparativa da perda de retenção de quatro sistemas de encaixes do tipo ERA e O-Ring empregados sob overdentures em função do tempo de uso Comparative evaluation of retention loss in four types of attachments used on overdentures in function of time of use

    Directory of Open Access Journals (Sweden)

    Wellington Cardoso Bonachela

    2003-03-01

    Full Text Available O objetivo deste trabalho foi avaliar e comparar a capacidade retentiva entre dois sistemas O-ring e O-SO (Grupo I e dois sistemas ERA - cápsulas de retenção cinza e brancas - (Grupo II, em função simulada, com ciclos de inserção e remoção, do início, 6 meses, 1, 2, 3, 4 e 5 anos depois. Dois implantes do tipo Brånemark foram fixados em duas bases metálicas trapezoidais, sendo os testes de inserção e remoção feitos numa máquina de costura ajustada para este propósito, usando um sistema de correias e polias, movendo um virabrequim. Uma platina de delineador foi usada para fixação dos corpos de prova às bases metálicas na máquina de costura. Os testes de resistência ao movimento axial das cápsulas por tensão foram feitos numa máquina de ensaios universal em períodos de tempo pré-estabelecidos, antes e após o término do ciclo na máquina de costura. Baseado nos resultados, esse estudo pôde concluir que houve perda de retenção de todos os sistemas testados, porém o sistema ERA apresentou, desde o início, maior retenção quando comparado aos outros sistemas e a cápsula cinza mostrou o melhor resultado no final da simulação.The aim of this study was to evaluate and compare the retentive capacity between two O-ring and O-SO system (Group I, and two ERA system types - white and gray retention caps - (Group II, respectively, in simulated function in database, 6 months, 1, 2, 3, 4, and 5 years later, with insertion and removal cycles. Two Brånemark implants were fixed in two trapezoidal metallic bases for the tests. Removal and insertion tests were done in a sewing machine, adjusted for this purpose using a belt and a pulley system, moving a steel crankshaft. A delineator platinum hold was used for body trial fixation to the metallic base of the sewing machine. Resistance test to axial movement of the caps by tension was done in a Universal test machine in an established period of time, before and after the cycle

  18. Comparative Magma Oceanography

    Science.gov (United States)

    Jones, J. H.

    1999-01-01

    The question of whether the Earth ever passed through a magma ocean stage is of considerable interest. Geochemical evidence strongly suggests that the Moon had a magma ocean and the evidence is mounting that the same was true for Mars. Analyses of martian (SNC) meteorites have yielded insights into the differentiation history of Mars, and consequently, it is interesting to compare that planet to the Earth. Three primary features of Mars contrast strongly to those of the Earth: (i) the extremely ancient ages of the martian core, mantle, and crust (about 4.55 b.y.); (ii) the highly depleted nature of the martian mantle; and (iii) the extreme ranges of Nd isotopic compositions that arise within the crust and depleted mantle. The easiest way to explain the ages and diverse isotopic compositions of martian basalts is to postulate that Mars had an early magma ocean. Cumulates of this magma ocean were later remelted to form the SNC meteorite suite and some of these melts assimilated crustal materials enriched in incompatible elements. The REE pattern of the crust assimilated by these SNC magmas was LREE enriched. If this pattern is typical of the crust as a whole, the martian crust is probably similar in composition to melts generated by small degrees of partial melting (about 5%) of a primitive source. Higher degrees of partial melting would cause the crustal LREE pattern to be essentially flat. In the context of a magma ocean model, where large degrees of partial melting presumably prevailed, the crust would have to be dominated by late-stage, LREE-enriched residual liquids. Regardless of the exact physical setting, Nd and W isotopic evidence indicates that martian geochemical reservoirs must have formed early and that they have not been efficiently remixed since. The important point is that in both the Moon and Mars we see evidence of a magma ocean phase and that we recognize it as such. Several lines of theoretical inference point to an early Earth that was also hot

  19. Comparative law as method and the method of comparative law

    NARCIS (Netherlands)

    Hage, J.C.; Adams, M.; Heirbaut, D.

    2014-01-01

    This article addresses both the justificatory role of comparative law within legal research (comparative law as method) and the method of comparative law itself. In this connection two questions will be answered: 1. Is comparative law a method, or a set of methods, for legal research? 2. Does

  20. Right $P$-comparable semigroups

    OpenAIRE

    Halimi, Nazer. H.

    2009-01-01

    In this paper we introduce the notion of right waist and right comparizer ideals for semigroups. In particular, we study the ideal theory of semigroups containing right waists and right comparizer ideals. We also study those properties of right cones that can be carried over to right $P$-comparable semigroups. We give sufficient and necessary conditions on the set of nilpotent elements of a semigroup to be an ideal. We provide several equivalent characterizations for a right ideal being a rig...

  1. Comparative Education Histories: A Postscript

    Science.gov (United States)

    Manzon, Maria

    2018-01-01

    Comparative education is two centuries old. Many mainstream historical narratives claim that the field began with the iconic opus of Marc-Antoine Jullien de Paris (1817). This article offers to re-theorise the histories of comparative education. It suggests casting a far-sighted and panoramic look at the field's origins. An underlying assumption…

  2. Comparable Worth Theory and Policy.

    Science.gov (United States)

    Wittig, Michele Andrisin; Lowe, Rosemary Hays

    1989-01-01

    Provides different perspectives on comparable worth issues. Covers the following topics: (1) competing explanations for the wage gap; (2) indirect approaches to wage equity; (3) the need for a direct approach to wage equity; (4) job evaluation; (5) application of comparable worth principles to compensation systems; and (6) strategies for adopting…

  3. Comparing word and face recognition

    DEFF Research Database (Denmark)

    Robotham, Ro Julia; Starrfelt, Randi

    2017-01-01

    included, as a control, which makes designing experiments all the more challenging. Three main strategies have been used to overcome this problem, each of which has limitations: 1) Compare performances on typical tests of the three stimulus types (e.g., a Face Memory Test, an Object recognition test...... this framework to classify tests and experiments aiming to compare processing across these categories, it becomes apparent that core differences in characteristics (visual and semantic) between the stimuli make the problem of designing comparable tests an insoluble conundrum. By analyzing the experimental...

  4. Comparing neutrino and antineutrino scattering

    International Nuclear Information System (INIS)

    Barish, B.C.

    1977-01-01

    The charged current interaction is considered. The present situation with respect to the indications of new physics at high energies, especially in the context of what can be learned by comparing neutrino with antineutrino production is reviewed

  5. Ethnography and comparative housing research

    NARCIS (Netherlands)

    Ronald, R.

    2011-01-01

    Housing systems across advanced societies are typically compared in terms of quantitative measures of aggregate variables, with little regard for local complexity, diversity and cultural contingency. This paper seeks, through the exploration of ethnographic techniques, to reflect on both the

  6. Physician Compare National Downloadable File

    Data.gov (United States)

    U.S. Department of Health & Human Services — The Physician Compare National Downloadable File is organized at the individual eligible professional level; each line is unique at the professional/enrollment...

  7. CompareTests-R package

    Science.gov (United States)

    CompareTests is an R package to estimate agreement and diagnostic accuracy statistics for two diagnostic tests when one is conducted on only a subsample of specimens. A standard test is observed on all specimens.

  8. Comparing long term energy scenarios

    International Nuclear Information System (INIS)

    Cumo, M.; Simbolotti, G.

    2001-01-01

    Major projection studies by international organizations and senior analysts have been compared with reference to individual key parameters (population, energy demand/supply, resources, technology, emissions and global warming) to understand trends and implications of the different scenarios. Then, looking at the long term (i.e., 2050 and beyond), parameters and trends have been compared together to understand and quantify whether and when possible crisis or market turbulence might occur due to shortage of resources or environmental problems [it

  9. Comparative Methodology and Postmodern Relativism

    Science.gov (United States)

    Young, Robert

    1997-09-01

    The author addresses the problems of conducting comparative studies in education if one adopts a viewpoint of postmodern relativism. While acknowledging the value of postmodernist thought in opening up a new understanding of the educational process, he finds that postmodernism raises difficulties when one attempts to deal with the differences and interactions between cultures. He rejects the extremes of both relativism and universalism and argues that comparative studies should be based on a balance between the two.

  10. Corporate Finance and Comparative Advantage

    OpenAIRE

    Peter Egger; Christian Keuschnigg

    2009-01-01

    Since innovative firms are often financially constrained, access to external funds is important for the expansion of innovative industries. This paper reports four important results. First, comparative advantage is shaped by factor endowments as well as fundamental determinants of corporate finance. In particular, a larger equity ratio of firms and tough governance standards relax finance constraints and create a comparative advantage in innovative industries. Second, factor price equalizatio...

  11. Reuse of ash coal in the formulation of mortars; Reaproveitamento de cinzas de carvao mineral na formulacao de argamassas

    Energy Technology Data Exchange (ETDEWEB)

    Siqueira, J.S.; Souza, C.A.G.; Souza, J.A.S., E-mail: jacilene_s@yahoo.com.br, E-mail: celioag@ufpa.br, E-mail: jass@ufpa.br [Programa de Pos Graduacao em Engenharia Quimica, Universidade Federal do Para, UFPA/PPEQ, Belem, PA (Brazil)

    2012-04-15

    This paper aims to study the ash incorporation from the combustion of coal in fluidized bed boilers, in production of mortar, replacing part of cement. Specimens were prepared using Portland cement to the specifications CPII-E-32 of normal characteristics and classification of sand below 100 mesh. Blends in the 4:1 ratio, that is, 4 parts of aggregate to 1 part of cement, with insertion of ashes in the proportions 0, 10, 20, 30, 40 and 50%. The mortar was developed in mixing and casting was made in a mold of 5 cm x 10 cm. The behavior of compressive strength was evaluated after 28 days; the strength decreases with increasing percentage of ash. Additional analysis was carried out by X-ray diffraction, and it was found that the substitution of this waste can be successfully used in mortars with blends of up to 30%. (author)

  12. Cloud computing for comparative genomics

    Directory of Open Access Journals (Sweden)

    Pivovarov Rimma

    2010-05-01

    Full Text Available Abstract Background Large comparative genomics studies and tools are becoming increasingly more compute-expensive as the number of available genome sequences continues to rise. The capacity and cost of local computing infrastructures are likely to become prohibitive with the increase, especially as the breadth of questions continues to rise. Alternative computing architectures, in particular cloud computing environments, may help alleviate this increasing pressure and enable fast, large-scale, and cost-effective comparative genomics strategies going forward. To test this, we redesigned a typical comparative genomics algorithm, the reciprocal smallest distance algorithm (RSD, to run within Amazon's Elastic Computing Cloud (EC2. We then employed the RSD-cloud for ortholog calculations across a wide selection of fully sequenced genomes. Results We ran more than 300,000 RSD-cloud processes within the EC2. These jobs were farmed simultaneously to 100 high capacity compute nodes using the Amazon Web Service Elastic Map Reduce and included a wide mix of large and small genomes. The total computation time took just under 70 hours and cost a total of $6,302 USD. Conclusions The effort to transform existing comparative genomics algorithms from local compute infrastructures is not trivial. However, the speed and flexibility of cloud computing environments provides a substantial boost with manageable cost. The procedure designed to transform the RSD algorithm into a cloud-ready application is readily adaptable to similar comparative genomics problems.

  13. Cloud computing for comparative genomics.

    Science.gov (United States)

    Wall, Dennis P; Kudtarkar, Parul; Fusaro, Vincent A; Pivovarov, Rimma; Patil, Prasad; Tonellato, Peter J

    2010-05-18

    Large comparative genomics studies and tools are becoming increasingly more compute-expensive as the number of available genome sequences continues to rise. The capacity and cost of local computing infrastructures are likely to become prohibitive with the increase, especially as the breadth of questions continues to rise. Alternative computing architectures, in particular cloud computing environments, may help alleviate this increasing pressure and enable fast, large-scale, and cost-effective comparative genomics strategies going forward. To test this, we redesigned a typical comparative genomics algorithm, the reciprocal smallest distance algorithm (RSD), to run within Amazon's Elastic Computing Cloud (EC2). We then employed the RSD-cloud for ortholog calculations across a wide selection of fully sequenced genomes. We ran more than 300,000 RSD-cloud processes within the EC2. These jobs were farmed simultaneously to 100 high capacity compute nodes using the Amazon Web Service Elastic Map Reduce and included a wide mix of large and small genomes. The total computation time took just under 70 hours and cost a total of $6,302 USD. The effort to transform existing comparative genomics algorithms from local compute infrastructures is not trivial. However, the speed and flexibility of cloud computing environments provides a substantial boost with manageable cost. The procedure designed to transform the RSD algorithm into a cloud-ready application is readily adaptable to similar comparative genomics problems.

  14. Sociological analysis and comparative education

    Science.gov (United States)

    Woock, Roger R.

    1981-12-01

    It is argued that comparative education is essentially a derivative field of study, in that it borrows theories and methods from academic disciplines. After a brief humanistic phase, in which history and philosophy were central for comparative education, sociology became an important source. In the mid-50's and 60's, sociology in the United States was characterised by Structural Functionalism as a theory, and Social Survey as a dominant methodology. Both were incorporated into the development of comparative education. Increasingly in the 70's, and certainly today, the new developments in sociology are characterised by an attack on Positivism, which is seen as the philosophical position underlying both functionalism and survey methods. New or re-discovered theories with their attendant methodologies included Marxism, Phenomenological Sociology, Critical Theory, and Historical Social Science. The current relationship between comparative education and social science is one of uncertainty, but since social science is seen to be returning to its European roots, the hope is held out for the development of an integrated social theory and method which will provide a much stronger basis for developments in comparative education.

  15. Nuclear power ecology: comparative analysis

    International Nuclear Information System (INIS)

    Trofimenko, A.P.; Lips'ka, A.Yi.; Pisanko, Zh.Yi.

    2005-01-01

    Ecological effects of different energy sources are compared. Main actions for further nuclear power development - safety increase and waste management, are noted. Reasons of restrained public position to nuclear power and role of social and political factors in it are analyzed. An attempt is undertaken to separate real difficulties of nuclear power from imaginary ones that appear in some mass media. International actions of environment protection are noted. Risk factors at different energy source using are compared. The results of analysis indicate that ecological influence and risk for nuclear power are of minimum

  16. BOOK REVIEW: The Current Comparator

    Science.gov (United States)

    Petersons, Oskars

    1989-01-01

    This 120-page book is a concise, yet comprehensive, clearly-written and well-illustrated monograph that covers the subject matter from basic principles through design, construction and calibration details to the principal applications. The book will be useful, as a primer, to the uninitiated and, as a reference book to the practitioner involved with transformer-type ratio devices. The length of the book and the style of presentation will not overburden any informed reader. The described techniques and the cited references are primarily from the work at the National Research Council, Canada (NRC). Any omissions, however, are not serious with respect to coverage of the subject matter, since most of the development work has been done at NRC. The role of transformers and transformer-like devices for establishing accurate voltage and current ratios has been recognized for over half a century. Transformer techniques were much explored and developed in the fifties and sixties for accuracy levels suitable for standards laboratories. Three-winding voltage transformers were developed for scaling of impedances in connection with the calculable Thompson Lampard capacitor; three-winding current transformers or current comparators were initially explored for the calibration of current transformers and later for specialized impedance measurements. Extensive development of the current comparator and its applications has been and is still being conducted at the NRC by a team that was started and, until his retirement, led by N L Kusters. The team is now led by W J M Moore. He and P N Miljanic, the authors of this book, have had the principal roles in the development of the current comparator. It is fortunate for the field of metrology that considerabe resources and a talented group of researchers were available to do this development along with mechanisms that were available to transfer this technology to a private sector instrument manufacturer and, thus, disseminate it world wide

  17. Comparative study Beamnrc VS Pinnacle

    International Nuclear Information System (INIS)

    Moreno Reyes, J. C.; Macias Jaen, J.; Jimenez Ortega, E.

    2013-01-01

    Has been developed in JAVA a software application called JJGAMMA, capable of manipulating the environment BEAMNRC and Pinnacle output formats 3 , comfortable, fast and accurately. As particular application you can use to compare dose distributions (plans for treatments, checking fields for modeling and clinical accelerators Commissioner) using, as objective criteria, function or Gamma index. (Author)

  18. Analysing and Comparing Encodability Criteria

    Directory of Open Access Journals (Sweden)

    Kirstin Peters

    2015-08-01

    Full Text Available Encodings or the proof of their absence are the main way to compare process calculi. To analyse the quality of encodings and to rule out trivial or meaningless encodings, they are augmented with quality criteria. There exists a bunch of different criteria and different variants of criteria in order to reason in different settings. This leads to incomparable results. Moreover it is not always clear whether the criteria used to obtain a result in a particular setting do indeed fit to this setting. We show how to formally reason about and compare encodability criteria by mapping them on requirements on a relation between source and target terms that is induced by the encoding function. In particular we analyse the common criteria full abstraction, operational correspondence, divergence reflection, success sensitiveness, and respect of barbs; e.g. we analyse the exact nature of the simulation relation (coupled simulation versus bisimulation that is induced by different variants of operational correspondence. This way we reduce the problem of analysing or comparing encodability criteria to the better understood problem of comparing relations on processes.

  19. The Economics of Comparable Worth.

    Science.gov (United States)

    Killingsworth, Mark R.

    This document concludes that the basic difficulty with comparable worth is that it is an ill-conceived solution to a serious problem and that alternative policies, such as equal employment opportunity legislation or application of antitrust laws, provide means of addressing employment discrimination that are both more effective and less likely to…

  20. Countries compared on public performance

    NARCIS (Netherlands)

    Jedid-Jah Jonker

    2012-01-01

    How well is the public sector performing? Are citizens being well served? This report compares the performance of nine public services in 28 developed countries over the period 1995-2009. Four sectors - education, health care, social safety and housing - are studied in some detail, while the

  1. Job Satisfaction in Fisheries Compared

    Science.gov (United States)

    Pollnac, Richard; Bavinck, Maarten; Monnereau, Iris

    2012-01-01

    This article draws comparative lessons from seven job satisfaction studies on marine capture fishing that were recently carried out in nine countries and three geographical regions--Asia, Africa, and the Caribbean. The seven studies made use of an identical job satisfaction assessment tool and present information on a selection of metiers mainly…

  2. Paracetamol suppositories: a comparative study.

    Science.gov (United States)

    Cullen, S; Kenny, D; Ward, O C; Sabra, K

    1989-01-01

    Paracetamol suppositories in two different bases were given to children who had fever after operations. Plasma concentrations and the effect on temperature were compared. There was a significant correlation between peak plasma concentrations and maximum drop in temperature. A lipophilic base produced better results than a hydrophilic base. PMID:2817936

  3. Paracetamol suppositories: a comparative study.

    OpenAIRE

    Cullen, S; Kenny, D; Ward, O C; Sabra, K

    1989-01-01

    Paracetamol suppositories in two different bases were given to children who had fever after operations. Plasma concentrations and the effect on temperature were compared. There was a significant correlation between peak plasma concentrations and maximum drop in temperature. A lipophilic base produced better results than a hydrophilic base.

  4. Teaching Strategy: Comparing Rights Documents.

    Science.gov (United States)

    Shiman, David A.

    1998-01-01

    Engages students in comparing the rights proclaimed in the Universal Declaration of Human Rights (UDHR) with those present in the United States Bill of Rights and other constitutional amendments. Challenges the students to explore reasons for the presence or absence of certain rights and to reflect on the role of the government. (CMK)

  5. Comparative dermatology: acquired digital fibrokeratoma

    OpenAIRE

    Cunha Filho, Roberto Rheingantz da

    2008-01-01

    Demonstra-se quadro característico de fibroqueratoma digital adquirido em trabalhadora rural de 42 anos de idade, que se compara a corno de rinoceronte.It is presented a case of a 42 year-old white female farmer with the classical feature of acquired digital fibrokeratoma, which is compared to rhinoceros horn.

  6. Comparing Candidate Hospital Report Cards

    Energy Technology Data Exchange (ETDEWEB)

    Burr, T.L.; Rivenburgh, R.D.; Scovel, J.C.; White, J.M.

    1997-12-31

    We present graphical and analytical methods that focus on multivariate outlier detection applied to the hospital report cards data. No two methods agree which hospitals are unusually good or bad, so we also present ways to compare the agreement between two methods. We identify factors that have a significant impact on the scoring.

  7. COGNATE: comparative gene annotation characterizer.

    Science.gov (United States)

    Wilbrandt, Jeanne; Misof, Bernhard; Niehuis, Oliver

    2017-07-17

    The comparison of gene and genome structures across species has the potential to reveal major trends of genome evolution. However, such a comparative approach is currently hampered by a lack of standardization (e.g., Elliott TA, Gregory TR, Philos Trans Royal Soc B: Biol Sci 370:20140331, 2015). For example, testing the hypothesis that the total amount of coding sequences is a reliable measure of potential proteome diversity (Wang M, Kurland CG, Caetano-Anollés G, PNAS 108:11954, 2011) requires the application of standardized definitions of coding sequence and genes to create both comparable and comprehensive data sets and corresponding summary statistics. However, such standard definitions either do not exist or are not consistently applied. These circumstances call for a standard at the descriptive level using a minimum of parameters as well as an undeviating use of standardized terms, and for software that infers the required data under these strict definitions. The acquisition of a comprehensive, descriptive, and standardized set of parameters and summary statistics for genome publications and further analyses can thus greatly benefit from the availability of an easy to use standard tool. We developed a new open-source command-line tool, COGNATE (Comparative Gene Annotation Characterizer), which uses a given genome assembly and its annotation of protein-coding genes for a detailed description of the respective gene and genome structure parameters. Additionally, we revised the standard definitions of gene and genome structures and provide the definitions used by COGNATE as a working draft suggestion for further reference. Complete parameter lists and summary statistics are inferred using this set of definitions to allow down-stream analyses and to provide an overview of the genome and gene repertoire characteristics. COGNATE is written in Perl and freely available at the ZFMK homepage ( https://www.zfmk.de/en/COGNATE ) and on github ( https

  8. Episodic Memory: A Comparative Approach

    Science.gov (United States)

    Martin-Ordas, Gema; Call, Josep

    2013-01-01

    Historically, episodic memory has been described as autonoetic, personally relevant, complex, context-rich, and allowing mental time travel. In contrast, semantic memory, which is theorized to be free of context and personal relevance, is noetic and consists of general knowledge of facts about the world. The field of comparative psychology has adopted this distinction in order to study episodic memory in non-human animals. Our aim in this article is not only to reflect on the concept of episodic memory and the experimental approaches used in comparative psychology to study this phenomenon, but also to provide a critical analysis of these paradigms. We conclude the article by providing new avenues for future research. PMID:23781179

  9. Comparative Genomics in Homo sapiens.

    Science.gov (United States)

    Oti, Martin; Sammeth, Michael

    2018-01-01

    Genomes can be compared at different levels of divergence, either between species or within species. Within species genomes can be compared between different subpopulations, such as human subpopulations from different continents. Investigating the genomic differences between different human subpopulations is important when studying complex diseases that are affected by many genetic variants, as the variants involved can differ between populations. The 1000 Genomes Project collected genome-scale variation data for 2504 human individuals from 26 different populations, enabling a systematic comparison of variation between human subpopulations. In this chapter, we present step-by-step a basic protocol for the identification of population-specific variants employing the 1000 Genomes data. These variants are subsequently further investigated for those that affect the proteome or RNA splice sites, to investigate potentially biologically relevant differences between the populations.

  10. Enhancer Identification through Comparative Genomics

    Energy Technology Data Exchange (ETDEWEB)

    Visel, Axel; Bristow, James; Pennacchio, Len A.

    2006-10-01

    With the availability of genomic sequence from numerousvertebrates, a paradigm shift has occurred in the identification ofdistant-acting gene regulatory elements. In contrast to traditionalgene-centric studies in which investigators randomly scanned genomicfragments that flank genes of interest in functional assays, the modernapproach begins electronically with publicly available comparativesequence datasets that provide investigators with prioritized lists ofputative functional sequences based on their evolutionary conservation.However, although a large number of tools and resources are nowavailable, application of comparative genomic approaches remains far fromtrivial. In particular, it requires users to dynamically consider thespecies and methods for comparison depending on the specific biologicalquestion under investigation. While there is currently no single generalrule to this end, it is clear that when applied appropriately,comparative genomic approaches exponentially increase our power ingenerating biological hypotheses for subsequent experimentaltesting.

  11. Introduction to SamplerCompare

    Directory of Open Access Journals (Sweden)

    Madeleine B. Thompson

    2011-08-01

    Full Text Available SamplerCompare is an R package for comparing the performance of Markov chain Monte Carlo (MCMC samplers. It samples from a collection of distributions with a collection of MCMC methods over a range of tuning parameters. Then, using log density evaluations per uncorrelated observation as a figure of merit, it generates a grid of plots showing the results of the simulation. It comes with a collection of predefined distributions and samplers and provides R and C interfaces for defining additional ones. It also provides the means to import simulation data generated by external systems. This document provides background on the package and demonstrates the basics of running simulations, visualizing results, and defining distributions and samplers in R.

  12. BANK RATING. A COMPARATIVE ANALYSIS

    Directory of Open Access Journals (Sweden)

    Batrancea Ioan

    2015-07-01

    Full Text Available Banks in Romania offers its customers a wide range of products but which involves both risk taking. Therefore researchers seek to build rating models to help managers of banks to risk of non-recovery of loans and interest. In the following we highlight rating Raiffeisen Bank, BCR-ERSTE Bank and Transilvania Bank, based on the models CAAMPL and Stickney making a comparative analysis of the two rating models.

  13. Detecting selection needs comparative data

    DEFF Research Database (Denmark)

    Nielsen, Rasmus; Hubisz, Melissa J.

    2005-01-01

    Positive selection at the molecular level is usually indicated by an increase in the ratio of non-synonymous to synonymous substitutions (dN/dS) in comparative data. However, Plotkin et al. 1 describe a new method for detecting positive selection based on a single nucleotide sequence. We show here...... that this method is particularly sensitive to assumptions regarding the underlying mutational processes and does not provide a reliable way to identify positive selection....

  14. School bullying - A comparative approach -

    OpenAIRE

    Kosevaliska, Olga; Buzarovska - Lazetik, Gordana; Nanev, Lazar

    2014-01-01

    The modest purpose of this paper is to elaborate the phenomenon of school bullying and to try to give an answer to questions that remain open over time because of the seriousness of this issue. A child is being bullied when he or she is exposed repeatedly over time to aggressive behavior that intentionally inflicts injury or discomfort through physical contact, verbal attacks, fighting or psychological manipulation. Besides finding the proper definition of bullying, we’ll give a comparative a...

  15. Comparative optimism about healthy eating.

    Science.gov (United States)

    Sproesser, Gudrun; Klusmann, Verena; Schupp, Harald T; Renner, Britta

    2015-07-01

    The present study investigated people's perception of their own as compared to their peers' healthy eating and related these perceptions to actual healthy eating, BMI, and subsequent healthy eating behavior. Data were collected within the framework of the longitudinal cohort study Konstanz Life Study (T1: N = 770; T2: N = 510). Our results demonstrated an optimistic bias on the group level. Specifically, people rated their own eating behavior as healthier on average than that of their average peers. This comparative optimism occurred even when actual healthy eating was unfavorable and BMI was high. However, it increased with actual healthy eating behavior. Importantly, optimistic perceptions were positively related to the intention to eat healthily and healthy eating six months later. Hence, the results suggest that an optimistic comparative view of one's own healthy eating is grounded in reality and boosts rather than deters subsequent health behavior. This implies that there might not be a need to reduce optimistic perceptions of healthy eating behavior. Copyright © 2015 Elsevier Ltd. All rights reserved.

  16. Phytozome Comparative Plant Genomics Portal

    Energy Technology Data Exchange (ETDEWEB)

    Goodstein, David; Batra, Sajeev; Carlson, Joseph; Hayes, Richard; Phillips, Jeremy; Shu, Shengqiang; Schmutz, Jeremy; Rokhsar, Daniel

    2014-09-09

    The Dept. of Energy Joint Genome Institute is a genomics user facility supporting DOE mission science in the areas of Bioenergy, Carbon Cycling, and Biogeochemistry. The Plant Program at the JGI applies genomic, analytical, computational and informatics platforms and methods to: 1. Understand and accelerate the improvement (domestication) of bioenergy crops 2. Characterize and moderate plant response to climate change 3. Use comparative genomics to identify constrained elements and infer gene function 4. Build high quality genomic resource platforms of JGI Plant Flagship genomes for functional and experimental work 5. Expand functional genomic resources for Plant Flagship genomes

  17. Building and using comparable corpora

    CERN Document Server

    Sharoff, Serge; Zweigenbaum, Pierre; Fung, Pascale

    2013-01-01

    The 1990s saw a paradigm change in the use of corpus-driven methods in NLP. In the field of multilingual NLP (such as machine translation and terminology mining) this implied the use of parallel corpora. However, parallel resources are relatively scarce: many more texts are produced daily by native speakers of any given language than translated. This situation resulted in a natural drive towards the use of comparable corpora, i.e. non-parallel texts in the same domain or genre. Nevertheless, this research direction has not produced a single authoritative source suitable for researchers and stu

  18. Body mass in comparative primatology.

    Science.gov (United States)

    Smith, R J; Jungers, W L

    1997-06-01

    Data are presented on adult body mass for 230 of 249 primate species, based on a review of the literature and previously unpublished data. The issues involved in collecting data on adult body mass are discussed, including the definition of adults, the effects of habitat and pregnancy, the strategy for pooling data on single species from multiple studies, and use of an appropriate number of significant figures. An analysis of variability in body mass indicates that the coefficient of variation for body mass increases with increasing species mean mass. Evaluation of several previous body mass reviews reveals a number of shortcomings with data that have been used often in comparative studies.

  19. Comparing India and the West

    Directory of Open Access Journals (Sweden)

    S.N. Balagangadhara

    2008-10-01

    Full Text Available During the last two decades, I have been pursuing an unorthodox way of studying cultural differences, focusing mainly on the Indian and the western cultures. Because I believe that one can answer questions about the circumscription of the words ‘Indian’ and ‘western’ cultures satisfactorily (Balangangadhara, 1994, I will assume their intelligibility in what follows. In this paper, I want to raise a rather intriguing problem about comparing these two cultures. I shall do that without looking at other approaches to the issue and in the form of an argument. In order to come to the point quickly, let me make use of Said’s 'Orientalism.'

  20. Forest ownership in comparative law

    Directory of Open Access Journals (Sweden)

    Üstüner Birben

    2015-07-01

    Full Text Available Efficient and sustainable use of forest resources depend on various factors. However, one of the most emphasized and discussed topics among these factors is forest ownership. Comparative law is an important way of analyzing and understanding legal systems of different countries, and identifying different aspects of the current legal systems. This study tries to analyze forest ownership with regard to comparative law. France for the Continental-European legal system, Great Britain for the Anglo-Saxon legal system, and Russia Federation for the Socialist legal system are taken respectively as a base. Thus, how right to ownership is evaluated in different legal systems and what are the main features of that are indicated. As a result, private forest ownership is common in the Continental-European legal system and Anglo-Saxon legal system while state ownership is common in the Socialist legal system. Prevalence of private forest ownership in the Continental-European and the Anglo-Saxon legal systems is also closely related to the previous use rights transferred into right to ownership. In addition, it is concluded regarding the historical process that many changes occurred on forest ownership types without considering differences in legal systems.

  1. Comparing Civilian Support for Terrorism

    Directory of Open Access Journals (Sweden)

    Srobana Bhattacharya

    2017-06-01

    Full Text Available Terrorism is an extreme form of political violence, that is inherently abhorrent in nature. Yet, it continues to attain enough support to continue and survive. The recent proliferation of Islamic State and its ever increasing domestic and international civilian support base urges immediate attention to this question. While most research holds that provision of public goods by terrorist groups is the primary cause for high levels of civilian support, I argue that, terrorist groups are more interested in resource extraction rather than resource provision. Additionally, these studies pay scant attention to existing resource structure, especially territorial and political control to explain terrorist-civilian interaction. This paper emphasizes the bi-directional nature of this interaction – a. perception of civilians by the terrorist group and b. terrorist group’s perception of the civilians. To analyze levels of civilian support for terrorism, I compare fifteen terrorist groups using qualitative comparative analysis and show how territory, political competition, ethnicity, target selection and organizational structure combine to explain conditions that lead terrorist groups to include or exclude civilian population for support. Based on the variance in support networks of terrorist groups, counter-terrorism policies should also differ. High civilian support indicates the need to use non-military methods to decrease the appeal of terrorist groups. However, terrorist groups with more diffused and multiple support structures need more collaborative and coercive measures to intercept all the possible links to the main group.

  2. Comparative transcriptomics in the Triticeae

    Directory of Open Access Journals (Sweden)

    Waugh Robbie

    2009-06-01

    Full Text Available Abstract Background Barley and particularly wheat are two grass species of immense agricultural importance. In spite of polyploidization events within the latter, studies have shown that genotypically and phenotypically these species are very closely related and, indeed, fertile hybrids can be created by interbreeding. The advent of two genome-scale Affymetrix GeneChips now allows studies of the comparison of their transcriptomes. Results We have used the Wheat GeneChip to create a "gene expression atlas" for the wheat transcriptome (cv. Chinese Spring. For this, we chose mRNA from a range of tissues and developmental stages closely mirroring a comparable study carried out for barley (cv. Morex using the Barley1 GeneChip. This, together with large-scale clustering of the probesets from the two GeneChips into "homologous groups", has allowed us to perform a genomic-scale comparative study of expression patterns in these two species. We explore the influence of the polyploidy of wheat on the results obtained with the Wheat GeneChip and quantify the correlation between conservation in gene sequence and gene expression in wheat and barley. In addition, we show how the conservation of expression patterns can be used to elucidate, probeset by probeset, the reliability of the Wheat GeneChip. Conclusion While there are many differences in expression on the level of individual genes and tissues, we demonstrate that the wheat and barley transcriptomes appear highly correlated. This finding is significant not only because given small evolutionary distance between the two species it is widely expected, but also because it demonstrates that it is possible to use the two GeneChips for comparative studies. This is the case even though their probeset composition reflects rather different design principles as well as, of course, the present incomplete knowledge of the gene content of the two species. We also show that, in general, the Wheat GeneChip is not able

  3. Ensembl 2002: accommodating comparative genomics.

    Science.gov (United States)

    Clamp, M; Andrews, D; Barker, D; Bevan, P; Cameron, G; Chen, Y; Clark, L; Cox, T; Cuff, J; Curwen, V; Down, T; Durbin, R; Eyras, E; Gilbert, J; Hammond, M; Hubbard, T; Kasprzyk, A; Keefe, D; Lehvaslaiho, H; Iyer, V; Melsopp, C; Mongin, E; Pettett, R; Potter, S; Rust, A; Schmidt, E; Searle, S; Slater, G; Smith, J; Spooner, W; Stabenau, A; Stalker, J; Stupka, E; Ureta-Vidal, A; Vastrik, I; Birney, E

    2003-01-01

    The Ensembl (http://www.ensembl.org/) database project provides a bioinformatics framework to organise biology around the sequences of large genomes. It is a comprehensive source of stable automatic annotation of human, mouse and other genome sequences, available as either an interactive web site or as flat files. Ensembl also integrates manually annotated gene structures from external sources where available. As well as being one of the leading sources of genome annotation, Ensembl is an open source software engineering project to develop a portable system able to handle very large genomes and associated requirements. These range from sequence analysis to data storage and visualisation and installations exist around the world in both companies and at academic sites. With both human and mouse genome sequences available and more vertebrate sequences to follow, many of the recent developments in Ensembl have focusing on developing automatic comparative genome analysis and visualisation.

  4. Challenges in Comparative Oral Epic

    Directory of Open Access Journals (Sweden)

    John Miles Foley

    2012-10-01

    Full Text Available Originally written in 2001 and subsequently published in China, this collaborative essay explores five questions central to comparative oral epic with regard to Mongolian, South Slavic, ancient Greek, and Old English traditions: “What is a poem in oral epic tradition?” “What is a typical scene or theme in oral epic tradition?” “What is a poetic line in oral epic tradition?” “What is a formula in an oral epic tradition?” “What is the register in oral epic poetry?” Now available for the first time in English, this essay reflects a foundational stage of what has become a productive and long-term collaboration between the Center for Studies in Oral Tradition and the Institute of Ethnic Literature of the Chinese Academy of Social Sciences.

  5. Lupus nephritis management guidelines compared.

    Science.gov (United States)

    Wilhelmus, Suzanne; Bajema, Ingeborg M; Bertsias, George K; Boumpas, Dimitrios T; Gordon, Caroline; Lightstone, Liz; Tesar, Vladimir; Jayne, David R

    2016-06-01

    In the past years, many (randomized) trials have been performed comparing the treatment strategies for lupus nephritis. In 2012, these data were incorporated in six different guidelines for treating lupus nephritis. These guidelines are European, American and internationally based, with one separate guideline for children. They offer information on different aspects of the management of lupus nephritis including induction and maintenance treatment of the different histological classes, adjunctive treatment, monitoring of the patient, definitions of response and relapse, indications for (repeat) renal biopsy, and additional challenges such as the presence of vascular complications, the pregnant SLE patient, treatment in children and adolescents and considerations about end-stage renal disease and transplantation. In this review, we summarize the guidelines, determine the common ground between them, highlight the differences and discuss recent literature. © The Author 2015. Published by Oxford University Press on behalf of ERA-EDTA. All rights reserved.

  6. Comparing Methods for Cardiac Output

    DEFF Research Database (Denmark)

    Graeser, Karin; Zemtsovski, Mikhail; Kofoed, Klaus F

    2018-01-01

    of the left ventricular outflow tract. METHODS: The primary aim was a systematic comparison of CO with Doppler-derived 3D TEE and CO by thermodilution in a broad population of patients undergoing cardiac surgery. A subanalysis was performed comparing cross-sectional area by TEE with cardiac computed...... tomography (CT) angiography. Sixty-two patients, scheduled for elective heart surgery, were included; 1 was subsequently excluded for logistic reasons. Inclusion criteria were coronary artery bypass surgery (N = 42) and aortic valve replacement (N = 19). Exclusion criteria were chronic atrial fibrillation......, left ventricular ejection fraction below 0.40 and intracardiac shunts. Nineteen randomly selected patients had a cardiac CT the day before surgery. All images were stored for blinded post hoc analyses, and Bland-Altman plots were used to assess agreement between measurement methods, defined as the bias...

  7. Becoming fit for transnational comparability

    DEFF Research Database (Denmark)

    Krejsler, John Benedicto; Ulf, Olsson; Kenneth, Petersson

    2018-01-01

    . Consequently, Danish teacher education discourse has emerged from a distinctly national vocational seminary tradition, into a modernized university college discourse that increasingly fits the transnational templates of comparability, albeit at a slower pace than her Swedish neighbor. It is often difficult...... of modern nations, if they are to succeed in “an increasingly competitive global race among knowledge economies.” In the case of the Bologna Process, the transformative effects are often rather direct. More often, however, effects touch upon national educational agendas in indirect ways, in terms......This chapter traces how national teacher education policy discourse in Denmark and Sweden is being transformed by opaque, albeit often inclusive, processes in transnational policy forums, such as the Bologna Process, OECD, and EU. This is facilitated by “soft law” surrounding the imagined needs...

  8. Military Retention. A Comparative Outlook

    Directory of Open Access Journals (Sweden)

    Vasile Sminchise

    2016-06-01

    Full Text Available One of the main goals for human resources management structures and for armed forces leaders is to maintain all necessary personnel, both qualitatively and quantitatively for operational needs or for full required capabilities. The retention of military personnel is essential to keep morale and unit readiness and to reduce the costs for recruiting, training, replacement of manpower. Retention rates depend not only on money or other social measures. The goal for retention is to keep in use the most valuable resource that belongs to an organization: the human beings and their knowledge. The aim pf this paper is to provide a comparative analysis of retention measures in various countries based on Research and Technology Organisation report released in 2007 and, thus, provide more examples of retention measures as far as the Romanian military system is concerned.

  9. [Comparative studies of face recognition].

    Science.gov (United States)

    Kawai, Nobuyuki

    2012-07-01

    Every human being is proficient in face recognition. However, the reason for and the manner in which humans have attained such an ability remain unknown. These questions can be best answered-through comparative studies of face recognition in non-human animals. Studies in both primates and non-primates show that not only primates, but also non-primates possess the ability to extract information from their conspecifics and from human experimenters. Neural specialization for face recognition is shared with mammals in distant taxa, suggesting that face recognition evolved earlier than the emergence of mammals. A recent study indicated that a social insect, the golden paper wasp, can distinguish their conspecific faces, whereas a closely related species, which has a less complex social lifestyle with just one queen ruling a nest of underlings, did not show strong face recognition for their conspecifics. Social complexity and the need to differentiate between one another likely led humans to evolve their face recognition abilities.

  10. COMPARATIVE HABITABILITY OF TRANSITING EXOPLANETS

    Energy Technology Data Exchange (ETDEWEB)

    Barnes, Rory; Meadows, Victoria S.; Evans, Nicole, E-mail: rory@astro.washington.edu [Astronomy Department, University of Washington, Box 951580, Seattle, WA 98195 (United States)

    2015-12-01

    Exoplanet habitability is traditionally assessed by comparing a planet’s semimajor axis to the location of its host star’s “habitable zone,” the shell around a star for which Earth-like planets can possess liquid surface water. The Kepler space telescope has discovered numerous planet candidates near the habitable zone, and many more are expected from missions such as K2, TESS, and PLATO. These candidates often require significant follow-up observations for validation, so prioritizing planets for habitability from transit data has become an important aspect of the search for life in the universe. We propose a method to compare transiting planets for their potential to support life based on transit data, stellar properties and previously reported limits on planetary emitted flux. For a planet in radiative equilibrium, the emitted flux increases with eccentricity, but decreases with albedo. As these parameters are often unconstrained, there is an “eccentricity-albedo degeneracy” for the habitability of transiting exoplanets. Our method mitigates this degeneracy, includes a penalty for large-radius planets, uses terrestrial mass–radius relationships, and, when available, constraints on eccentricity to compute a number we call the “habitability index for transiting exoplanets” that represents the relative probability that an exoplanet could support liquid surface water. We calculate it for Kepler objects of interest and find that planets that receive between 60% and 90% of the Earth’s incident radiation, assuming circular orbits, are most likely to be habitable. Finally, we make predictions for the upcoming TESS and James Webb Space Telescope missions.

  11. COMPARATIVE HABITABILITY OF TRANSITING EXOPLANETS

    International Nuclear Information System (INIS)

    Barnes, Rory; Meadows, Victoria S.; Evans, Nicole

    2015-01-01

    Exoplanet habitability is traditionally assessed by comparing a planet’s semimajor axis to the location of its host star’s “habitable zone,” the shell around a star for which Earth-like planets can possess liquid surface water. The Kepler space telescope has discovered numerous planet candidates near the habitable zone, and many more are expected from missions such as K2, TESS, and PLATO. These candidates often require significant follow-up observations for validation, so prioritizing planets for habitability from transit data has become an important aspect of the search for life in the universe. We propose a method to compare transiting planets for their potential to support life based on transit data, stellar properties and previously reported limits on planetary emitted flux. For a planet in radiative equilibrium, the emitted flux increases with eccentricity, but decreases with albedo. As these parameters are often unconstrained, there is an “eccentricity-albedo degeneracy” for the habitability of transiting exoplanets. Our method mitigates this degeneracy, includes a penalty for large-radius planets, uses terrestrial mass–radius relationships, and, when available, constraints on eccentricity to compute a number we call the “habitability index for transiting exoplanets” that represents the relative probability that an exoplanet could support liquid surface water. We calculate it for Kepler objects of interest and find that planets that receive between 60% and 90% of the Earth’s incident radiation, assuming circular orbits, are most likely to be habitable. Finally, we make predictions for the upcoming TESS and James Webb Space Telescope missions

  12. Expanding Comparative Literature into Comparative Sciences Clusters with Neutrosophy and Quad-stage Method

    Directory of Open Access Journals (Sweden)

    Fu Yuhua

    2016-08-01

    Full Text Available By using Neutrosophy and Quad-stage Method, the expansions of comparative literature include: comparative social sciences clusters, comparative natural sciences clusters, comparative interdisciplinary sciences clusters, and so on. Among them, comparative social sciences clusters include: comparative literature, comparative history, comparative philosophy, and so on; comparative natural sciences clusters include: comparative mathematics, comparative physics, comparative chemistry, comparative medicine, comparative biology, and so on.

  13. Comparative cytotoxicity of periodontal bacteria

    International Nuclear Information System (INIS)

    Stevens, R.H.; Hammond, B.F.

    1988-01-01

    The direct cytotoxicity of sonic extracts (SE) from nine periodontal bacteria for human gingival fibroblasts (HGF) was compared. Equivalent dosages (in terms of protein concentration) of SE were used to challenge HGF cultures. The cytotoxic potential of each SE was assessed by its ability to (1) inhibit HGF proliferation, as measured by direct cell counts; (2) inhibit 3H-thymidine incorporation in HGF cultures; or (3) cause morphological alterations of the cells in challenged cultures. The highest concentration (500 micrograms SE protein/ml) of any of the SEs used to challenge the cells was found to be markedly inhibitory to the HGFs by all three of the criteria of cytotoxicity. At the lowest dosage tested (50 micrograms SE protein/ml); only SE from Actinobacillus actinomycetemcomitans, Bacteroides gingivalis, and Fusobacterium nucleatum caused a significant effect (greater than 90% inhibition or overt morphological abnormalities) in the HGFs as determined by any of the criteria employed. SE from Capnocytophaga sputigena, Eikenella corrodens, or Wolinella recta also inhibited cell proliferation and thymidine incorporation at this dosage; however, the degree of inhibition (5-50%) was consistently, clearly less than that of the first group of three organisms named above. The SE of the three other organisms tested (Actinomyces odontolyticus, Bacteroides intermedius, and Streptococcus sanguis) had little or no effect (0-10% inhibition) at this concentration. The data suggest that the outcome of the interaction between bacterial components and normal resident cells of the periodontium is, at least in part, a function of the bacterial species

  14. Sex work: a comparative study.

    Science.gov (United States)

    McCarthy, Bill; Benoit, Cecilia; Jansson, Mikael

    2014-10-01

    Explanations of adult involvement in sex work typically adopt one of two approaches. One perspective highlights a variety of negative experiences in childhood and adolescence, including physical and sexual abuse, family instability, poverty, associations with "pimps" and other exploiters, homelessness, and drug use. An alternative account recognizes that some of these factors may be involved, but underscores the contribution of more immediate circumstances, such as current economic needs, human capital, and employment opportunities. Prior research offers a limited assessment of these contrasting claims: most studies have focused exclusively on people working in the sex industry and they have not assessed the independent effects of life course variables central to these two perspectives. We add to this literature with an analysis that drew on insights from life course and life-span development theories and considered the contributions of factors from childhood, adolescence, and adulthood. Our comparative approach examined predictors of employment in sex work relative to two other low-income service or care work occupations: food and beverage serving and barbering and hairstyling. Using data from a study of almost 600 workers from two cities, one in Canada and the other in the United States, we found that both immediate circumstances and negative experiences from early life are related to current sex work involvement: childhood poverty, abuse, and family instability were independently associated with adult sex work, as were limited education and employment experience, adult drug use, and marital status.

  15. Cats, Cancer and Comparative Oncology

    Directory of Open Access Journals (Sweden)

    Claire M. Cannon

    2015-06-01

    Full Text Available Naturally occurring tumors in dogs are well-established models for several human cancers. Domestic cats share many of the benefits of dogs as a model (spontaneous cancers developing in an immunocompetent animal sharing the same environment as humans, shorter lifespan allowing more rapid trial completion and data collection, lack of standard of care for many cancers allowing evaluation of therapies in treatment-naïve populations, but have not been utilized to the same degree in the One Medicine approach to cancer. There are both challenges and opportunities in feline compared to canine models. This review will discuss three specific tumor types where cats may offer insights into human cancers. Feline oral squamous cell carcinoma is common, shares both clinical and molecular features with human head and neck cancer and is an attractive model for evaluating new therapies. Feline mammary tumors are usually malignant and aggressive, with the ‘triple-negative’ phenotype being more common than in humans, offering an enriched population in which to examine potential targets and treatments. Finally, although there is not an exact corollary in humans, feline injection site sarcoma may be a model for inflammation-driven tumorigenesis, offering opportunities for studying variations in individual susceptibility as well as preventative and therapeutic strategies.

  16. Sonourethrography compared to retrograde urethrography

    International Nuclear Information System (INIS)

    Kim, Jong Chul; Chang, Nam Sik; Park, Cheong Hee; Rhee, Byung Chul; Kong, Jae Chul; Park, Jong Yoon

    1989-01-01

    A total of 15 patients with suspected urethral stricture or fistula underwent conventional retrograde urethrography and following sonourethrography with saline infusion or voiding against Eschmann penile clamp, in Gyeongsang and Chungnam National University Hospital from July, 1989 to June, 1989. The sonographic findings were as diagnostic as the roentgen findings in 12 patients. When the length of the strictures assessed by each imaging modality was compared to measurement at open urothroplasty of 2 patients, sonourethrography was consistently more accurate. Urethroscopy was done in all cases. Sonourethrography using distension technique of the urethra enabled classification of the degree of spongiofibrosis, thus provided the guidance of direct vision internal urethrotomy in 9 patients. In 2 patients, the sonourethrogram identified periurethral tumor and urethral polyp which were not definitely analysed on the retrograde urethrogram. In the patient of posttraumatic postoperative urethrorectal fistula, residual fistuous tract was seen on both examinations. In 1 patient of stricture with severe periurethral scar, urethral stricture recurred after graft. No patient reported significant discomfort during the sonourethrogram. The sonourethrogram provided valuable, dynamic. 3 dimensional information about the luminal and extraluminal anatomy and pathology of the anterior urethra. The new method of sonourethrogram allows for the appropriate decision to be made easier for optimal treatment of urethal stricture, etc, and can be used as a follow up study

  17. Alkali activated fly ash binders. A comparative study between sodium and potassium activators

    Directory of Open Access Journals (Sweden)

    Criado, M.

    2006-03-01

    Full Text Available This paper shows the effect of the nature of some alkaline activators in the microstructural development of thermal-alkali activated f/y ash systems. The alkaline compounds employed in this investigation were: NaOH, KOH, Na2C03, K2C03, sodium silicate and potassium silicate. Results confirm that the main reaction product of the activation process (throughout the studied systems is the amorphous alkaline aluminosilicate gel with a three-dimensional structure already observed in earlier research. It has been proved that the type of anion and cation involved in the activation reaction of the ashes not only affects the microstructural development of the systems but the Si/Al ratio of that prezeolitic gel too. For example, in the presence of soluble silicate ions the content of Si in the final structure is notably increased (Si/Al =2.7-3.0, however carbonate ions play a different role since the formation of Sodium or Potassium carbonate/bicarbonate acidifies the system and consequently the reaction rate is considerably slowed. Finally it is evident that; when all experimental conditions are equal, sodium has a greater capacity than potassium to accelerate the setting and hardening reactions of fly ash and also to stimulate the growth of certain zeolitic crystals (reaction by-products. In general it can be affirmed that OH- ion acts as a reaction catalyst; and the alkaline metal (M+ acts as a structure-forming element.Este trabajo muestra el efecto de la naturaleza del activador alcalino en el desarrollo microestructural de sistemas de ceniza volante, activados térmica y alcalinamente. Los componentes alcalinos empleados en esta investigación fueron: NaOH, KOH, Na2C03, K2C03, silicato sódico y silicato potásico. Los resultados obtenidos confirman que el principal producto de reacción del proceso de activación (a través de los sistemas estudiados es un gel de aluminosilicato alcalino amorfo con estructura tridimensional ya observada en trabajos

  18. Comparative pathogenomics of Clostridium tetani.

    Directory of Open Access Journals (Sweden)

    Jonathan E Cohen

    Full Text Available Clostridium tetani and Clostridium botulinum produce two of the most potent neurotoxins known, tetanus neurotoxin and botulinum neurotoxin, respectively. Extensive biochemical and genetic investigation has been devoted to identifying and characterizing various C. botulinum strains. Less effort has been focused on studying C. tetani likely because recently sequenced strains of C. tetani show much less genetic diversity than C. botulinum strains and because widespread vaccination efforts have reduced the public health threat from tetanus. Our aim was to acquire genomic data on the U.S. vaccine strain of C. tetani to better understand its genetic relationship to previously published genomic data from European vaccine strains. We performed high throughput genomic sequence analysis on two wild-type and two vaccine C. tetani strains. Comparative genomic analysis was performed using these and previously published genomic data for seven other C. tetani strains. Our analysis focused on single nucleotide polymorphisms (SNP and four distinct constituents of the mobile genome (mobilome: a hypervariable flagellar glycosylation island region, five conserved bacteriophage insertion regions, variations in three CRISPR (clustered regularly interspaced short palindromic repeats-Cas (CRISPR-associated systems, and a single plasmid. Intact type IA and IB CRISPR/Cas systems were within 10 of 11 strains. A type IIIA CRISPR/Cas system was present in two strains. Phage infection histories derived from CRISPR-Cas sequences indicate C. tetani encounters phages common among commensal gut bacteria and soil-borne organisms consistent with C. tetani distribution in nature. All vaccine strains form a clade distinct from currently sequenced wild type strains when considering variations in these mobile elements. SNP, flagellar glycosylation island, prophage content and CRISPR/Cas phylogenic histories provide tentative evidence suggesting vaccine and wild type strains share a

  19. Comparing records with related chronologies

    Science.gov (United States)

    Bronk Ramsey, Christopher; Albert, Paul; Kearney, Rebecca; Staff, Richard A.

    2016-04-01

    In order to integrate ice, terrestrial and marine records, it is necessary to deal with records on different timescales. These timescales can be grouped into those that use a common fundamental chronometer (such as Uranium-Thorium dating or Radiocarbon) and can also be related to one another where we have chronological tie points such as tephra horizons. More generally we can, through a number of different methodologies, derive relationships between different timescales. A good example of this is the use of cosmogenic isotope production, specifically 10Be and 14C to relate the calibrated radiocarbon timescale to that of the Greenland ice cores. The relationships between different timescales can be mathematically expressed in terms of time-transfer functions. This formalism allows any related record to be considered against any linked timescale with an appropriate associated uncertainty. The prototype INTIMATE chronological database allows records to be viewed and compared in this way and this is now being further developed, both to include a wider range of records and also to provide better connectivity to other databases and chronological tools. These developments will also include new ways to use tephra tie-points to constrain the relationship between timescales directly, without needing to remodel each associated timescale. The database as it stands allows data for particular timeframes to be recalled and plotted against any timescale, or exported in spreadsheet format. New functionality will be added to allow users to work with their own data in a private space and then to publish it when it has been through the peer-review publication process. In order to make the data easier to use for other further analysis and plotting, and with data from other sources, the database will also act as a server to deliver data in a JSON format. The aim of this work is to make the comparison of integrated data much easier for researchers and to ensure that good practice in

  20. Comparative Climatology of Terrestrial Planets

    Science.gov (United States)

    Mackwell, Stephen J.; Simon-Miller, Amy A.; Harder, Jerald W.; Bullock, Mark A.

    to a future volume. Our authors have taken on the task to look at climate on the terrestrial planets in the broadest sense possible — by comparing the atmospheric processes at work on the four terrestrial bodies, Earth, Venus, Mars, and Titan (Titan is included because it hosts many of the common processes), and on terrestrial planets around other stars. These processes include the interactions of shortwave and thermal radiation with the atmosphere, condensation and vaporization of volatiles, atmospheric dynamics, chemistry and aerosol formation, and the role of the surface and interior in the long-term evolution of climate. Chapters herein compare the scientific questions, analysis methods, numerical models, and spacecraft remote sensing experiments of Earth and the other terrestrial planets, emphasizing the underlying commonality of physical processes. We look to the future by identifying objectives for ongoing research and new missions. Through these pages we challenge practicing planetary scientists, and most importantly new students of any age, to find pathways and synergies for advancing the field. In Part I, Foundations, we introduce the fundamental physics of climate on terrestrial planets. Starting with the best studied planet by far, Earth, the first chapters discuss what is known and what is not known about the atmospheres and climates of the terrestrial planets of the solar system and beyond. In Part II, Greenhouse Effect and Atmospheric Dynamics, we focus on the processes that govern atmospheric motion and the role that general circulation models play in our current understanding. In Part III, Clouds and Hazes, we provide an in-depth look at the many effects of clouds and aerosols on planetary climate. Although this is a vigorous area of research in the Earth sciences, and very strongly influences climate modeling, the important role that aerosols and clouds play in the climate of all planets is not yet well constrained. This section is intended to

  1. Comparative pathogenomics of Clostridium tetani.

    Science.gov (United States)

    Cohen, Jonathan E; Wang, Rong; Shen, Rong-Fong; Wu, Wells W; Keller, James E

    2017-01-01

    Clostridium tetani and Clostridium botulinum produce two of the most potent neurotoxins known, tetanus neurotoxin and botulinum neurotoxin, respectively. Extensive biochemical and genetic investigation has been devoted to identifying and characterizing various C. botulinum strains. Less effort has been focused on studying C. tetani likely because recently sequenced strains of C. tetani show much less genetic diversity than C. botulinum strains and because widespread vaccination efforts have reduced the public health threat from tetanus. Our aim was to acquire genomic data on the U.S. vaccine strain of C. tetani to better understand its genetic relationship to previously published genomic data from European vaccine strains. We performed high throughput genomic sequence analysis on two wild-type and two vaccine C. tetani strains. Comparative genomic analysis was performed using these and previously published genomic data for seven other C. tetani strains. Our analysis focused on single nucleotide polymorphisms (SNP) and four distinct constituents of the mobile genome (mobilome): a hypervariable flagellar glycosylation island region, five conserved bacteriophage insertion regions, variations in three CRISPR (clustered regularly interspaced short palindromic repeats)-Cas (CRISPR-associated) systems, and a single plasmid. Intact type IA and IB CRISPR/Cas systems were within 10 of 11 strains. A type IIIA CRISPR/Cas system was present in two strains. Phage infection histories derived from CRISPR-Cas sequences indicate C. tetani encounters phages common among commensal gut bacteria and soil-borne organisms consistent with C. tetani distribution in nature. All vaccine strains form a clade distinct from currently sequenced wild type strains when considering variations in these mobile elements. SNP, flagellar glycosylation island, prophage content and CRISPR/Cas phylogenic histories provide tentative evidence suggesting vaccine and wild type strains share a common ancestor.

  2. Comparative Genomics of Carp Herpesviruses

    Science.gov (United States)

    Kurobe, Tomofumi; Gatherer, Derek; Cunningham, Charles; Korf, Ian; Fukuda, Hideo; Hedrick, Ronald P.; Waltzek, Thomas B.

    2013-01-01

    Three alloherpesviruses are known to cause disease in cyprinid fish: cyprinid herpesviruses 1 and 3 (CyHV1 and CyHV3) in common carp and koi and cyprinid herpesvirus 2 (CyHV2) in goldfish. We have determined the genome sequences of CyHV1 and CyHV2 and compared them with the published CyHV3 sequence. The CyHV1 and CyHV2 genomes are 291,144 and 290,304 bp, respectively, in size, and thus the CyHV3 genome, at 295,146 bp, remains the largest recorded among the herpesviruses. Each of the three genomes consists of a unique region flanked at each terminus by a sizeable direct repeat. The CyHV1, CyHV2, and CyHV3 genomes are predicted to contain 137, 150, and 155 unique, functional protein-coding genes, respectively, of which six, four, and eight, respectively, are duplicated in the terminal repeat. The three viruses share 120 orthologous genes in a largely colinear arrangement, of which up to 55 are also conserved in the other member of the genus Cyprinivirus, anguillid herpesvirus 1. Twelve genes are conserved convincingly in all sequenced alloherpesviruses, and two others are conserved marginally. The reference CyHV3 strain has been reported to contain five fragmented genes that are presumably nonfunctional. The CyHV2 strain has two fragmented genes, and the CyHV1 strain has none. CyHV1, CyHV2, and CyHV3 have five, six, and five families of paralogous genes, respectively. One family unique to CyHV1 is related to cellular JUNB, which encodes a transcription factor involved in oncogenesis. To our knowledge, this is the first time that JUNB-related sequences have been reported in a herpesvirus. PMID:23269803

  3. Estabilización química de suelos expansivos de san josé de cúcuta (colombia usando cenizas volantes

    Directory of Open Access Journals (Sweden)

    Carlos Humberto Florez-Gongora

    2008-07-01

    Full Text Available It presents the results of the chemical stabilization of a zone of San Jose de Cucuta, where it have been observed some damages in light buildings as a consequence of the expansion-shrinkage of the soil because of the change in moisture. To achieve soil stabilization, it will be used as chemical additive: fly ashes, analyzing possible advantages and drawbacks. The ashes were given by Termotasajero S.A, a company of the city. The Atterberg limits carried out in agreement to the standard ASTM D 4318-95 [1], moisture measurement (ASTM D 2216, shrinkage factors of soil (ASTM D 427-93/4943-95, particle size analysis of soils (ASTM D 422-63, specific gravity ASTM D 854-92 and Proctor standard test (ASTM D-698. From de moisture data, it is possible to observe its descending behaviour. The document shows information of specific surface area according to the procedure of blue of methylene described by Santamarina [2]. It was found that the clays, in this study case, has high plasticity (CH with a cation exchange capacity until 37 meq/100 g and high magnesium (Mg content. According to the norm NSR 98 (Title H [3], the swelling potential of the clays, is from high to very high. The behavior of the plasticity index is diminishing in values that range from thirty to forty per cent, for a percentage of mixing of 30 % in volume of ashes. This behavior confirms to us the formation of hydrates by means of pozzolanic reactions with the clayey soil. It was concluded the necessity to implement analysis of X-rays diffraction (XRD and electronic microscopy to determine mineralogical exact composition and microscopic structure, which would help to confirm or to reject the nature of high expansivity

  4. Evaluación de la resistencia a los sulfates de cemento con ceniza volante (utilizando el método de Koch & Steinegger)

    OpenAIRE

    Irassar, Edgardo F.; Sota, Jorge D.; Batic, Oscar R.

    1988-01-01

    El aumento del consumo de las adiciones minerales activas en los materiales cementíceos contemporáneos ha determinado la revisión de algunos métodos de ensayo utilizados para determinar sus propiedades. En la evaluación de la durabilidad de los cementos compuestos, muchos ensayos de corta duración (de gran aplicación en cementos portland) dejan de tener validez, pues no permiten evaluar las mejoras que producen los materiales puzolánicos. El método propuesto por KOCH...

  5. The effect of fly ashes in the corrosion and durability in concretes; Efecto de las Cenizas Volantes en la Durabilidad y en la Corrosion en Armaduras del Hormigon

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1998-12-31

    From the beginning of this century, fly ashes have been the object of a variety of studies and research-looking for different ways of application. The construction industry reuses the highest volume of the fly ash actually produced. Researches carried out on the behaviour of hydraulic blended materials mixed with fly ash have supported the progressive use of these by-products, and simultaneously have opened new ways of application. Spanish fly ash producers together with research centers, as IETcc, have been involved in investigations since 70`s. The last important research carried out has been the one dealing with the durability of concrete made with fly ash and its interaction with the corrosion of reinforcements. In this work five fly ashes of silicon-aluminous type were mixed with portland cement containing low alkali and aluminates in order to enhance the effect of those components from the fly ash. The main goal was to study the degradation mechanisms of concretes made with fly ashes, substituting partially the cement (15 and 35%) in several aggressive media: containing sulfates, chlorides or sea water. The effect to these aggressive media on the durability has also been considered regarding reinforcements. Different type of tests were carried out in laboratory and under natural exposure. In the case of laboratory studies the objectives were: 1) to stablish the mechanisms of hardening. The effect of fly ashes in pozolanic reaction and in the microstructure of the material. 2) Resistance of the addition of fly ashes against chloride and sulfates. Definition of the deterioration mechanisms. 3) Effect of fly ashes on the corrosion of reinforcements. Influence on the passivation process. Resistance against carbonation and chloride attack. (Author)

  6. Réalisation d'éco-ciments par la valorisation de cendres volantes de charbon non conventionnelles issues de centrales thermiques Spreader Stoker

    OpenAIRE

    Sow , Moustapha

    2016-01-01

    The main objective of this project was to evaluate the potential of coal fly ash from Spreader Stoker thermal power plants (Spreader Stoker Coal Fly Ash) in the manufacture of eco-cements in Reunion Island. We first performed a physico-chemical characterization SSCFA and verified its reactivity. Two valorisation paths were chosen, one of which did not present any added value but which permit to value a large quantity of SSCFA by stabilization in cement-based matrices, the other which offers a...

  7. Estabilización química de suelos expansivos de san josé de cúcuta (colombia) usando cenizas volantes

    OpenAIRE

    Carlos Humberto Florez-Gongora; Zuly Karina Caicedo-Osorio; Ricardo Zárate-Caballero; Betsy Amparo Contreras-Ortíz

    2008-01-01

    It presents the results of the chemical stabilization of a zone of San Jose de Cucuta, where it have been observed some damages in light buildings as a consequence of the expansion-shrinkage of the soil because of the change in moisture. To achieve soil stabilization, it will be used as chemical additive: fly ashes, analyzing possible advantages and drawbacks. The ashes were given by Termotasajero S.A, a company of the city. The Atterberg limits carried out in agreement to the standard ASTM D...

  8. Comparing recent uranium supply scenarios

    International Nuclear Information System (INIS)

    Arnold, N.; Gufler, K.

    2014-01-01

    For more than one decade – even after the Fukushima accidents - an increase in global nuclear energy generation capacity is widely expected. At the same time a variety of uranium supply scenarios were published by industry, academics or international organizations, drawing different pictures of future uranium supply. They were created with the background of a uranium market facing several challenges. First an excursion in the uranium market price, in 2007, then reduced nuclear growth expectations after 2011, at least in non-Asian countries, also implying considerable changes to the supply side. For this publication a meta-study was carried out identifying, evaluating and comparing different recent scenarios on the availability of uranium. While there are some differences in the frame conditions (e.g. the expected uranium demand, the time fame, the considered mining projects,..), there are also notable similarities in these scenarios. This concerns long lead times for mine openings as well as the dependence on large mining projects (e.g. Olympic Dam, Cigar Lake). Generally, a decline in production in about 10 years is assumed, and thus the necessity of the timely development of mining projects is pointed out. In addition the omission of uranium from Russian nuclear weapons and the chances of keeping the changes in secondary supplies in balance with primary production have been widely discussed. Here, the production growth in Kazakhstan but also the role of the current market situation are central aspects. As another aspect the possible contribution from unconventional resources is of interest, particularly against the background of rising production costs for conventional resources. Finally, it shall be reflected how well older scenarios were able to map the reality and which trends could or could not be anticipated. It is relevant to identify which aspects in the development of mining capacities are essential for security of supply, and can therefore be regarded

  9. Influência das fibras de aço e das adições minerais na fissuração de tirantes de concreto armado

    Directory of Open Access Journals (Sweden)

    L. A. Oliveira Júnior

    Full Text Available Neste trabalho é investigada a influência das fibras de aço e das adições minerais (sílica ativa e cinza volante na fissuração de tirantes de concreto armado. Fibras de aço com gancho nas extremidades e relação de aspecto igual a 65 foram usadas nas frações volumétricas de 0,75%, 1,00% e 1,50%. Dezesseis tirantes de 800 mm de comprimento e seção transversal quadrada de 150 mm de lado reforçados com uma barra de aço CA-50 de 20 mm de diâmetro foram submetidos à tração axial para determinação das aberturas das fissuras. Os resultados mostraram que as fibras reduziram a abertura média de fissuras em até 75% e que as adições minerais melhoraram o comportamento do concreto na fissuração. As aberturas de fissuras foram comparadas aos valores sugeridos pelas recomendações das normas brasileira, americana e européia, que se mostraram inadequadas para estimar a abertura de fissuras em concretos reforçados com fibras.

  10. Comparative cardiovascular safety of dementia medications

    DEFF Research Database (Denmark)

    Fosbøl, Emil L; Peterson, Eric D; Holm, Ellen

    2012-01-01

    To compare the cardiovascular safety of currently marketed dementia medications in new users in the United States and Denmark.......To compare the cardiovascular safety of currently marketed dementia medications in new users in the United States and Denmark....

  11. Weber, Durkheim, and the comparative method.

    Science.gov (United States)

    Kapsis, R E

    1977-10-01

    This essay compares and contrasts the means by which Durkheim and Weber dealt with methodological issues peculiar to the comparative study of societies, what Smelser has called "the problem of sociocultural variability and complexity." More specifically, it examines how Weber and Durkheim chose appropriate comparative units for their empirical studies. The approaches that Weber and Durkheim brought to theproblem of cross-cultural comparison have critical implications for more current procedures used in the comparative study of contemporary and historical societies.

  12. The Method of Adaptive Comparative Judgement

    Science.gov (United States)

    Pollitt, Alastair

    2012-01-01

    Adaptive Comparative Judgement (ACJ) is a modification of Thurstone's method of comparative judgement that exploits the power of adaptivity, but in scoring rather than testing. Professional judgement by teachers replaces the marking of tests; a judge is asked to compare the work of two students and simply to decide which of them is the better.…

  13. 10 CFR 5.410 - Comparable facilities.

    Science.gov (United States)

    2010-01-01

    ... 10 Energy 1 2010-01-01 2010-01-01 false Comparable facilities. 5.410 Section 5.410 Energy NUCLEAR... Prohibited § 5.410 Comparable facilities. A recipient may provide separate toilet, locker room, and shower facilities on the basis of sex, but such facilities provided for students of one sex shall be comparable to...

  14. 32 CFR 196.410 - Comparable facilities.

    Science.gov (United States)

    2010-07-01

    ... 32 National Defense 2 2010-07-01 2010-07-01 false Comparable facilities. 196.410 Section 196.410....410 Comparable facilities. A recipient may provide separate toilet, locker room, and shower facilities on the basis of sex, but such facilities provided for students of one sex shall be comparable to such...

  15. 36 CFR 1211.410 - Comparable facilities.

    Science.gov (United States)

    2010-07-01

    ... 36 Parks, Forests, and Public Property 3 2010-07-01 2010-07-01 false Comparable facilities. 1211... § 1211.410 Comparable facilities. A recipient may provide separate toilet, locker room, and shower facilities on the basis of sex, but such facilities provided for students of one sex shall be comparable to...

  16. Multi-headed comparatives in Portuguese

    Directory of Open Access Journals (Sweden)

    Rui Marques

    2005-06-01

    Full Text Available This paper aims at offering a global picture of the subtype of comparative constructions known as ‘multi-headed comparatives’ (from the fact that they exhibit more than one comparative operator in semantic interdependence. As a prerequisite to the fulfilment of his goal, an attempt will be made to clarify the scope of the notion ‘comparative construction’ and to draw a general typology of such constructions. The boundaries of the notion ‘comparative construction’ are defined by contrasting a “genuine” class of comparative constructions with others that hold some syntactic or semantic resemblance to them. Different typologies will be taken into consideration. As for multi-headed comparatives, even though different examples of these constructions have been identified in the scarce literature on the matter, the discussion on their syntactic patterns and meaning is still embryonic. This paper suggests that the expressive power of these comparatives, which seem to provide a particular strategy of information compression, is higher than has been assumed. Four sub-kinds of multi-headed comparatives are identified, based on meaning differences, namely: multi-headed comparatives with a distributive reading, multi-headed comparatives with a cumulative reading, multi-headed comparatives with a comparison of ‘ratios’ reading, and multi-headed comparatives with a comparison of differences reading. While resorting to some classic English examples, the object language will predominantly be Portuguese.

  17. 27 CFR 5.66 - Comparative advertising.

    Science.gov (United States)

    2010-04-01

    ... 27 Alcohol, Tobacco Products and Firearms 1 2010-04-01 2010-04-01 false Comparative advertising. 5..., DEPARTMENT OF THE TREASURY LIQUORS LABELING AND ADVERTISING OF DISTILLED SPIRITS Advertising of Distilled Spirits § 5.66 Comparative advertising. (a) General. Comparative advertising shall not be disparaging of a...

  18. 27 CFR 4.65 - Comparative advertising.

    Science.gov (United States)

    2010-04-01

    ... 27 Alcohol, Tobacco Products and Firearms 1 2010-04-01 2010-04-01 false Comparative advertising. 4..., DEPARTMENT OF THE TREASURY LIQUORS LABELING AND ADVERTISING OF WINE Advertising of Wine § 4.65 Comparative advertising. (a) General. Comparative adverstising shall not be disparaging of a competitor's product. (b...

  19. 27 CFR 7.55 - Comparative advertising.

    Science.gov (United States)

    2010-04-01

    ... 27 Alcohol, Tobacco Products and Firearms 1 2010-04-01 2010-04-01 false Comparative advertising. 7..., DEPARTMENT OF THE TREASURY LIQUORS LABELING AND ADVERTISING OF MALT BEVERAGES Advertising of Malt Beverages § 7.55 Comparative advertising. (a) General. Comparative advertising shall not be disparaging of a...

  20. Comparative education and the ?new? sociologies

    Science.gov (United States)

    Trusz, Andrew R.; Parks-Trusz, Sandra L.

    1981-12-01

    The authors examine the impact of the `new' sociologies on comparative education by reviewing five comparative readers published during the past twenty years. While the `new' sociologies have had considerable impact within sociology and the sociology of education, minimal impact is found within comparative education. The authors further show that while critical new sociologies such as Marxism, neo-Marxism, and Critical theory have had some penetration into comparative education, use of the interpretative sociologies such as symbolic interactionism, ethnomethodology, and semiotics has generally been absent. The authors conclude by suggesting that a synthesis of the critical and interpretative modes would prove fruitful for further work in comparative education. The five texts are: Halsey, Floud and Anderson (eds.), Education, Economy and Society (1961); Eckstein and Noah (eds.), Scientific Investigations in Comparative Education (1969); Beck, Perspectives on World Education (1970); Karabel and Halsey (eds.), Power and Ideology in Education (1977); and Altbach and Kelly (eds.), Education and Colonialism (1978).

  1. Comparability Effects of Mandatory IFRS Adoption

    OpenAIRE

    Stefano Cascino; Joachim Gassen

    2012-01-01

    The mandatory adoption of IFRS by many countries worldwide fuels the expectation that financial accounting information might become more comparable across countries. This expectation is opposed to an alternative view that stresses the importance of incentives in shaping accounting information. We provide early evidence on this debate by investigating the effects of mandatory IFRS adoption on the comparability of financial accounting information around the world. Using two comparability proxie...

  2. Comparative qualitative research in Cultural Psychology

    DEFF Research Database (Denmark)

    Demuth, Carolin; Fatigante, Marilena

    2012-01-01

    The present paper aims to provide an approach that allows to study the interplay of culture and psychological human functioning in comparative study designs. Starting out with a brief overview of how qualitative, cultural, and comparative research is addressed in the field of psychology we...... will take a Cultural Psychology approach to suggest that the unit of analysis for comparative research needs to be situated social interaction. We will then suggest an integrative approach that allows us to study social interaction both on a micro- and on a macro-level by combining discourse analysis...... some criteria of validity that particularly apply to the field of comparative research in Cultural Psychology....

  3. Randomized, interventional, prospective, comparative study to ...

    African Journals Online (AJOL)

    Randomized, interventional, prospective, comparative study to evaluate the antihypertensive efficacy and tolerability of ramipril versus telmisartan in stage 1 hypertensive patients with diabetes mellitus.

  4. comparative proximate composition and antioxidant vitamins

    African Journals Online (AJOL)

    DR. AMINU

    Keywords: Comparative, proximate composition, antioxidant vitamins, honey. INTRODUCTION ... solution of inverted sugars and complex mixture of other saccharides ... enzymatic browning in apple slices and grape juice. (Khan, 1985).

  5. Patients' satisfaction with healthcare: comparing general practice ...

    African Journals Online (AJOL)

    Patients' satisfaction with healthcare: comparing general practice services in a tertiary and primary healthcare settings. ... Nigerian Health Journal ... This research compared the level of patients' satisfaction with general practice care delivered at physicians-manned General Outpatient clinics at tertiary and primary health ...

  6. 6 CFR 17.410 - Comparable facilities.

    Science.gov (United States)

    2010-01-01

    ... 6 Domestic Security 1 2010-01-01 2010-01-01 false Comparable facilities. 17.410 Section 17.410... the Basis of Sex in Education Programs or Activities Prohibited § 17.410 Comparable facilities. A recipient may provide separate toilet, locker room, and shower facilities on the basis of sex, but such...

  7. 18 CFR 1317.410 - Comparable facilities.

    Science.gov (United States)

    2010-04-01

    ... 18 Conservation of Power and Water Resources 2 2010-04-01 2010-04-01 false Comparable facilities... facilities. A recipient may provide separate toilet, locker room, and shower facilities on the basis of sex, but such facilities provided for students of one sex shall be comparable to such facilities provided...

  8. 34 CFR 106.33 - Comparable facilities.

    Science.gov (United States)

    2010-07-01

    ... 34 Education 1 2010-07-01 2010-07-01 false Comparable facilities. 106.33 Section 106.33 Education... Discrimination on the Basis of Sex in Education Programs or Activities Prohibited § 106.33 Comparable facilities. A recipient may provide separate toilet, locker room, and shower facilities on the basis of sex, but...

  9. 45 CFR 618.410 - Comparable facilities.

    Science.gov (United States)

    2010-10-01

    ... 45 Public Welfare 3 2010-10-01 2010-10-01 false Comparable facilities. 618.410 Section 618.410... Discrimination on the Basis of Sex in Education Programs or Activities Prohibited § 618.410 Comparable facilities. A recipient may provide separate toilet, locker room, and shower facilities on the basis of sex, but...

  10. 13 CFR 113.410 - Comparable facilities.

    Science.gov (United States)

    2010-01-01

    ... 13 Business Credit and Assistance 1 2010-01-01 2010-01-01 false Comparable facilities. 113.410... Discrimination on the Basis of Sex in Education Programs Or Activities Prohibited § 113.410 Comparable facilities. A recipient may provide separate toilet, locker room, and shower facilities on the basis of sex, but...

  11. 28 CFR 54.410 - Comparable facilities.

    Science.gov (United States)

    2010-07-01

    ... 28 Judicial Administration 2 2010-07-01 2010-07-01 false Comparable facilities. 54.410 Section 54... in Education Programs or Activities Prohibited § 54.410 Comparable facilities. A recipient may provide separate toilet, locker room, and shower facilities on the basis of sex, but such facilities...

  12. 31 CFR 28.410 - Comparable facilities.

    Science.gov (United States)

    2010-07-01

    ... 31 Money and Finance: Treasury 1 2010-07-01 2010-07-01 false Comparable facilities. 28.410 Section... on the Basis of Sex in Education Programs or Activities Prohibited § 28.410 Comparable facilities. A recipient may provide separate toilet, locker room, and shower facilities on the basis of sex, but such...

  13. 10 CFR 1042.410 - Comparable facilities.

    Science.gov (United States)

    2010-01-01

    ... 10 Energy 4 2010-01-01 2010-01-01 false Comparable facilities. 1042.410 Section 1042.410 Energy... Activities Prohibited § 1042.410 Comparable facilities. A recipient may provide separate toilet, locker room, and shower facilities on the basis of sex, but such facilities provided for students of one sex shall...

  14. 14 CFR 1253.410 - Comparable facilities.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 5 2010-01-01 2010-01-01 false Comparable facilities. 1253.410 Section... on the Basis of Sex in Education Programs or Activities Prohibited § 1253.410 Comparable facilities. A recipient may provide separate toilet, locker room, and shower facilities on the basis of sex, but...

  15. 44 CFR 19.410 - Comparable facilities.

    Science.gov (United States)

    2010-10-01

    ... 44 Emergency Management and Assistance 1 2010-10-01 2010-10-01 false Comparable facilities. 19.410... Activities Prohibited § 19.410 Comparable facilities. A recipient may provide separate toilet, locker room, and shower facilities on the basis of sex, but such facilities provided for students of one sex shall...

  16. Defining, Measuring, and Comparing Organisational Cultures

    NARCIS (Netherlands)

    van den Berg, Peter T.; Wilderom, Celeste P.M.

    2004-01-01

    La littérature portant sur la culture des organisations souffre d’un manque manifeste d’enquêtes extensives débouchant sur des études comparatives. Afin de rendre plus comparables les cultures organisationnelles, nous proposons une définition et une série de dimensions. La culture organisationnelle

  17. COMPARATIVE STUDY ON SPECIFIC AND EARLY DETECTION ...

    African Journals Online (AJOL)

    The objective of this study was to compare the sensitivity and specificity of smear and culture methods with rapid serological EIA myco kits manufactured by Omega diagnostics, for the early detection of Mycobacterium tuberculosis (MTB) complex. Sera from various categories of smear and culture results were compared ...

  18. Ethnic Dilemmas in Comparative Perspective: An Overview

    OpenAIRE

    Johnson, James H. Jr.; Oliver, Melvin L.

    1988-01-01

    The papers which comprise this volume were produced by a group of these nationally known scholars who are engaged in research on comparative aspects of ethnicity and ethnic group behavior. Organized around a series of themes which run through the extant comparative ethnicity literature and which reflect the expertise and current research foci of the conference presenters, the volume i...

  19. Suretyship in Serbian and comparative legal systems

    Directory of Open Access Journals (Sweden)

    Pajtić Bojan

    2014-01-01

    Full Text Available The author has compared the institute of suretyship in Serbian law and other comparative legal systems, both continental and common-law. With the development of economy, these instruments of creditor's protection in the contractual relationship have gained full promotion. The analysis of the similarities and differences in the treatment of suretyship implies a relationship between the European legal systems.

  20. Comparative Validation of Building Simulation Software

    DEFF Research Database (Denmark)

    Kalyanova, Olena; Heiselberg, Per

    The scope of this subtask is to perform a comparative validation of the building simulation software for the buildings with the double skin façade. The outline of the results in the comparative validation identifies the areas where is no correspondence achieved, i.e. calculation of the air flow r...... is that the comparative validation can be regarded as the main argument to continue the validation of the building simulation software for the buildings with the double skin façade with the empirical validation test cases.......The scope of this subtask is to perform a comparative validation of the building simulation software for the buildings with the double skin façade. The outline of the results in the comparative validation identifies the areas where is no correspondence achieved, i.e. calculation of the air flow...

  1. Comparative Political Economy and International Migration

    NARCIS (Netherlands)

    Afonso, A.; Devitt, C.

    2016-01-01

    This article provides an overview of the literature connecting comparative political economy and international migration in advanced industrialized countries with a focus on the relationship between labour migration, labour markets and welfare institutions. Immigration flows and policies are

  2. Comparative evaluation of the sperm characteristics and ...

    African Journals Online (AJOL)

    olayemitoyin

    J. Physiol. Sci. 29(June 2014) 055 –061 www.njps.com.ng. Comparative evaluation of the ... Summary: Cuscuta australis (C. australis) seed and stem are commonly used as .... 0.05, Values with different superscripts are significantly different.

  3. MANAGEMENT AND COMPARATIVE ANALYSIS OF DATASET ENSEMBLES

    Energy Technology Data Exchange (ETDEWEB)

    Geveci, Berk [Senior Director, Scientific Computing

    2010-05-17

    The primary Phase I technical objective was to develop a prototype that demonstrates the functionality of all components required for an end-to-end meta-data management and comparative visualization system.

  4. COMPARATIVE ANALYSIS OF SOME TECHNIQUES IN THE

    African Journals Online (AJOL)

    ES OBE

    25, No. 1, March 2006. Ayotamuno, Kogbara and Agunwamba 15. COMPARATIVE .... Option 0, was the Control (no treatment employed) ..... induce an enormous proliferation of microbial ... oxygen and nutrients imposed the greatest limitation ...

  5. Comparing the Discrete and Continuous Logistic Models

    Science.gov (United States)

    Gordon, Sheldon P.

    2008-01-01

    The solutions of the discrete logistic growth model based on a difference equation and the continuous logistic growth model based on a differential equation are compared and contrasted. The investigation is conducted using a dynamic interactive spreadsheet. (Contains 5 figures.)

  6. Comparative growth performance of different Australian ...

    African Journals Online (AJOL)

    Comparative growth performance of different Australian provenances and local land ... and Ubiri in the West Usambara Mountains (WUM), North East Tanzania. ... with local land races for subsequent management as seed production stands.

  7. ecco: An error correcting comparator theory.

    Science.gov (United States)

    Ghirlanda, Stefano

    2018-03-08

    Building on the work of Ralph Miller and coworkers (Miller and Matzel, 1988; Denniston et al., 2001; Stout and Miller, 2007), I propose a new formalization of the comparator hypothesis that seeks to overcome some shortcomings of existing formalizations. The new model, dubbed ecco for "Error-Correcting COmparisons," retains the comparator process and the learning of CS-CS associations based on contingency. ecco assumes, however, that learning of CS-US associations is driven by total error correction, as first introduced by Rescorla and Wagner (1972). I explore ecco's behavior in acquisition, compound conditioning, blocking, backward blocking, and unovershadowing. In these paradigms, ecco appears capable of avoiding the problems of current comparator models, such as the inability to solve some discriminations and some paradoxical effects of stimulus salience. At the same time, ecco exhibits the retrospective revaluation phenomena that are characteristic of comparator theory. Copyright © 2018 Elsevier B.V. All rights reserved.

  8. Tanzania's Revealed Comparative Advantage and Structural ...

    African Journals Online (AJOL)

    example, the contribution from vegetable products fell by 7%, and that from textiles .... 43 -‐ Furskins and artificial fur, manufactures thereof ... example, while Tanzania has comparative advantage in raw hides and skins (see Figure 6), it.

  9. Comparative sequence analyses of genome and transcriptome ...

    Indian Academy of Sciences (India)

    2015-12-04

    Dec 4, 2015 ... 2011), unique vocal communication. (Payne 2003; Nair et al. ... induction of apoptosis when compared to human cells. In this study, we have .... based on calculated Pearson correlation and displayed based on centroid of the ...

  10. comparative evaluation of pressure distribution between horizontal

    African Journals Online (AJOL)

    user

    This paper presents comparative analysis between the pressure behavior of ... Green and source function were used to evaluate the performance of horizontal well and ..... Superscript. ' derivative. D = dimensionless. h = horizontal. = change.

  11. A Python Library for Historical Comparative Linguistics

    OpenAIRE

    Moran , Steven; List , Johann-Mattis

    2012-01-01

    Awarded best paper award; International audience; In this talk we will discuss a European Research Council funded collaborative effort to build a Python library for undertaking academic research in historical-comparative linguistics. Our aim of implementing quantitative methods, specifically in Python, is to transform historical-comparative linguistics from a primarily handcrafted scientific scholarly endeavor, performed by individual researchers, into a quantitative and collaborative field o...

  12. Modularity, comparative cognition and human uniqueness

    OpenAIRE

    Shettleworth, Sara J.

    2012-01-01

    Darwin's claim ‘that the difference in mind between man and the higher animals … is certainly one of degree and not of kind’ is at the core of the comparative study of cognition. Recent research provides unprecedented support for Darwin's claim as well as new reasons to question it, stimulating new theories of human cognitive uniqueness. This article compares and evaluates approaches to such theories. Some prominent theories propose sweeping domain-general characterizations of the difference ...

  13. Mandatory IFRS adoption and accounting comparability

    OpenAIRE

    Cascino, Stefano; Gassen, Joachim

    2010-01-01

    The adoption of IFRS by many countries worldwide fuels the expectation that financial accounting might become more comparable across countries. This expectation is opposed to an alternative view that stresses the importance of incentives in shaping accounting information. We provide early evidence on this debate by investigating the effects of mandatory IFRS adoption on the comparability of financial accounting information around the world. Our results suggest that while mandatory adoption of...

  14. Comparative Analysis of Competitive Strategy Implementation

    OpenAIRE

    Maina A. S. Waweru

    2011-01-01

    This paper presents research findings on Competitive Strategy Implementation which compared the levels of strategy implementation achieved by different generic strategy groups, comprising firms inclined towards low cost leadership, differentiation or dual strategic advantage. The study sought to determine the preferences for use of implementation armaments and compared how such armaments related to the level of implementation achieved. Respondents comprised 71 top executives from 59 companies...

  15. Comparative Theology as Liberal and Confessional Theology

    Directory of Open Access Journals (Sweden)

    Klaus von Stosch

    2012-10-01

    Full Text Available For most European scholars, the scope of Comparative Theology is not very clear. They see big differences between the notion of Comparative Theology among its protagonists, e.g., between Keith Ward or Robert Neville and Francis Clooney or James Fredericks. That is why I will try to define a certain understanding of Comparative Theology which can be defended in accordance with strong European theological traditions. I want to show that Comparative Theology can be understood as one of the best fruits of liberal theology and of a Wittgensteinian interpretation of transcendental philosophy—and that it opens new perspectives for confessional theology. The current development of Islamic theology in Germany is especially challenging for Comparative Theology and the best opportunity to develop it into a project undertaken by scholars of different religions and different intellectual traditions. I will argue that Comparative Theology is not a new discipline within the old disciplines of theology, but that it can give new perspectives to all theological disciplines and thoroughly change their character.

  16. Share Valuation Using the Comparative Method

    Directory of Open Access Journals (Sweden)

    Jana Marková

    2016-12-01

    Full Text Available The comparative method is one of the methods of assessment of equity securities in theory and practice. The practical application of the comparative method is arranged in MS Decree No. 492/2004 Coll. on the establishment of the universal value of property and in Act No. 431/2002 Coll. on accounting, as amended by later regulations. According to this method, internal (general, real value is derived from information on specific prices or values of shares of similar companies. The comparative method can be applied without serious problems only provided that the differences between the companies are small; otherwise, its use has been problematic. To find a comparable public limited company on a mature capital market, where the number of traded comparable companies is high, is not a problem. It is very difficult for a small market such as Slovakia’s stock market. This paper discusses the application of comparative methods to the non-standard Slovak capital market.

  17. Comparative Medicine: An Inclusive Crossover Discipline.

    Science.gov (United States)

    Macy, James; Horvath, Tamas L

    2017-09-01

    Comparative Medicine is typically defined as a discipline which relates and leverages the biological similarities and differences among animal species to better understand the mechanism of human and animal disease. It has also been defined as a field of study concentrating on similarities and differences between human and veterinary medicine and is increasingly associated with animal models of human disease, including the critical role veterinarians, animal resource centers, and Institutional Animal Care and Use Committees play in facilitating and ensuring humane and reproducible laboratory animal care and use. To this end, comparative medicine plays a pivotal role in reduction, refinement, and replacement in animals in biomedical research. On many levels, comparative medicine facilitates the translation of basic science knowledge into clinical applications; applying comparative medicine concepts throughout the translation process is critical for success. In addition to the supportive role of comparative medicine in the research enterprise, its role as a distinct and independent scientific discipline should not be lost. Although comparative medicine's research "niche" is not one particular discipline or disease process, rather, it is the investigative mindset that seeks to reveal common threads that weave different pathophysiologic processes into translatable approaches and outcomes using various models.

  18. What Do We Compare When We Compare Religions? Philosophical Remarks on the Psychology of Studying Comparative Religion Abroad

    Science.gov (United States)

    Irvine, Andrew

    2015-01-01

    The issue of comparison is a vexing one in religious and theological studies, not least for teachers of comparative religion in study abroad settings. We try to make familiar ideas fresh and strange, in settings where students may find it hard not to take "fresh" and "strange" as signs of existential threat. The author explores…

  19. Comparing Electrochemical and Biological Water Splitting

    DEFF Research Database (Denmark)

    Rossmeisl, Jan; Dimitrievski, Kristian; Siegbahn, P.

    2007-01-01

    On the basis of density functional theory calculations, we compare the free energies of key intermediates in the water splitting reaction over transition metal oxide surfaces to those of the Mn cluster in photo system II. In spite of the very different environments in the enzyme system and on the......On the basis of density functional theory calculations, we compare the free energies of key intermediates in the water splitting reaction over transition metal oxide surfaces to those of the Mn cluster in photo system II. In spite of the very different environments in the enzyme system...... and on the inorganic catalyst surface of an acidic electrolysis cell, the thermochemical features of the catalysts can be directly compared. We suggest a simple test for a thermochemically optimal catalyst. We show that, although both the RuO2 surface and the Mn cluster in photo system II are quite close to optimal...

  20. Comparing formal verification approaches of interlocking systems

    DEFF Research Database (Denmark)

    Haxthausen, Anne Elisabeth; Nguyen, Hoang Nga; Roggenbach, Markus

    2016-01-01

    these approaches. As a first step towards this, in this paper we suggest a way to compare different formal approaches for verifying designs of route-based interlocking systems and we demonstrate it on modelling and verification approaches developed within the research groups at DTU/Bremen and at Surrey......The verification of railway interlocking systems is a challenging task, and therefore several research groups have suggested to improve this task by using formal methods, but they use different modelling and verification approaches. To advance this research, there is a need to compare....../Swansea. The focus is on designs that are specified by so-called control tables. The paper can serve as a starting point for further comparative studies. The DTU/Bremen research has been funded by the RobustRailS project granted by Innovation Fund Denmark. The Surrey/Swansea research has been funded by the Safe...

  1. The comparative method as a breaching experiment

    DEFF Research Database (Denmark)

    Mathieu, David

    Comparative studies have remained an exception in qualitative reception and audience studies (Jensen, 1998b), although recent years have witnessed ambitious projects (e.g. Barker & Mathijs, 2008) and increased cross-national research collaborations. This paper will present the design...... of an empirical comparative study of the cultural, cognitive and linguistic determinants of news comprehension and a discussion of the challenges, issues and benefits found in engaging with a comparative methodology in the context of reception and discourse analyses. The research project on which this paper...... is based sought to understand the processes by which mediated discourse such as news is comprehended by its audience (Mathieu, 2009). The empirical study consisted in a cross-cultural comparison of the reading processes between Danes and Canadians over a set of news texts from both countries...

  2. A comparative study of Averrhoabilimbi extraction method

    Science.gov (United States)

    Zulhaimi, H. I.; Rosli, I. R.; Kasim, K. F.; Akmal, H. Muhammad; Nuradibah, M. A.; Sam, S. T.

    2017-09-01

    In recent year, bioactive compound in plant has become a limelight in the food and pharmaceutical market, leading to research interest to implement effective technologies for extracting bioactive substance. Therefore, this study is focusing on extraction of Averrhoabilimbi by different extraction technique namely, maceration and ultrasound-assisted extraction. Fewplant partsof Averrhoabilimbiweretaken as extraction samples which are fruits, leaves and twig. Different solvents such as methanol, ethanol and distilled water were utilized in the process. Fruit extractsresult in highest extraction yield compared to other plant parts. Ethanol and distilled water have significant role compared to methanol in all parts and both extraction technique. The result also shows that ultrasound-assisted extraction gave comparable result with maceration. Besides, the shorter period on extraction process gives useful in term of implementation to industries.

  3. Comparative Studies: historical, epistemological and methodological notes

    Directory of Open Access Journals (Sweden)

    Juan Ignacio Piovani

    2017-09-01

    Full Text Available In this article some historical, epistemological and methodological issues related to comparative studies in the social sciences are addressed, with specific reference to the field of education. The starting point is a discussion of the meaning of comparison, its logical structure and its presence in science and in everyday life. It follows the presentation and critical appraisal of the perspectives regarding comparison as a scientific method. It is argued that, even rejecting this restrictive meaning of comparison as a method, there is some consensus on the specificity of comparative studies within the social sciences. And in relation to them, the article address in more detail those studies that can be defined as trans-contextual (cross-national and cross-cultural, with emphasis on the main methodological and technical challenges they face. The socio-historical comparative perspective, which has gained importance in recent years in the field of education, is also discussed.

  4. A Comparative Study on Error Analysis

    DEFF Research Database (Denmark)

    Wu, Xiaoli; Zhang, Chun

    2015-01-01

    Title: A Comparative Study on Error Analysis Subtitle: - Belgian (L1) and Danish (L1) learners’ use of Chinese (L2) comparative sentences in written production Xiaoli Wu, Chun Zhang Abstract: Making errors is an inevitable and necessary part of learning. The collection, classification and analysis...... the occurrence of errors either in linguistic or pedagogical terms. The purpose of the current study is to demonstrate the theoretical and practical relevance of error analysis approach in CFL by investigating two cases - (1) Belgian (L1) learners’ use of Chinese (L2) comparative sentences in written production...... of errors in the written and spoken production of L2 learners has a long tradition in L2 pedagogy. Yet, in teaching and learning Chinese as a foreign language (CFL), only handful studies have been made either to define the ‘error’ in a pedagogically insightful way or to empirically investigate...

  5. Comparative diagnostic accuracy in virtual dermatopathology

    DEFF Research Database (Denmark)

    Mooney, E.; Hood, A.F.; Lampros, J.

    2011-01-01

    studies comparing the diagnostic accuracy and acceptability of virtual slides compared to traditional glass slides. Methods: Ten Nordic dermatopathologists and pathologists were given a randomized combination of 20 virtual and glass slides and asked to identify the diagnoses. They were then asked to give...... their impressions about the virtual images. Descriptive data analysis and comparison of groups using Fisher's exact test were performed. Objective: To compare the diagnostic ability of dermatopathologists and pathologists in two image formats: the traditional (glass) microscopic slides, and whole mount digitized...... of virtual or glass slides did not affect the percentage of questions answered correctly. Seven of nine participants completing the questionnaire, felt virtual microscopy is useful for both learning and testing. Conclusion: There was no significant difference in the participants' diagnostic ability using...

  6. Environmental Comparative Risk Assessment: A Case Study

    International Nuclear Information System (INIS)

    Ali, M.M.

    2007-01-01

    Health and environmental impacts associated with energy production and industrial activities as well as food production and agricultural activities have had great concern in the last decades. Early activities emerged in late 80s of the last century through an Inter- Agency project (lAEA, UNDY, WHO, ... ) on the comparative risk assessment from energy systems and industrial complexes. A work-shop on Risk Assessment and Management in large industrial areas was held in Alexandria Egypt on 20-33 Det 1993, sponsored by IAEA. Several conferences, experts work groups and workshops were held there of Recent trends in determining risks are: 1. Use of probabilistic risk assessment approach to identify hazardous activities and accident scenario. 2. development of data base on failure probabilities and appropriate physical models. 3. Development of related directives and regulations and criteria Comparative risk assessment case study as a tool for comparing risk is emphasized Criteria of exposure to human and ecological risks are addressed

  7. Comparative Assessment Of Natural Gas Accident Risks

    International Nuclear Information System (INIS)

    Burgherr, P.; Hirschberg, S.

    2005-01-01

    The study utilizes a hierarchical approach including (1) comparative analyses of different energy chains, (2) specific evaluations for the natural gas chain, and (3) a detailed overview of the German situation, based on an extensive data set provided by Deutsche Vereinigung des Gas- und Wasserfaches (DVGW). According to SVGW-expertise DVGW-data can be regarded as fully representative for Swiss conditions due to very similar technologies, management, regulations and safety culture, but has a substantially stronger statistical basis because the German gas grid is about 30 times larger compared to Switzerland. Specifically, the following tasks were carried out by PSI to accomplish the objectives of this project: (1) Consolidation of existing ENSAD data, (2) identification and evaluation of additional sources, (3) comparative assessment of accident risks, and (4) detailed evaluations of specific issues and technical aspects for severe and smaller accidents in the natural gas chain that are relevant under Swiss conditions. (author)

  8. Sequencing and comparing whole mitochondrial genomes ofanimals

    Energy Technology Data Exchange (ETDEWEB)

    Boore, Jeffrey L.; Macey, J. Robert; Medina, Monica

    2005-04-22

    Comparing complete animal mitochondrial genome sequences is becoming increasingly common for phylogenetic reconstruction and as a model for genome evolution. Not only are they much more informative than shorter sequences of individual genes for inferring evolutionary relatedness, but these data also provide sets of genome-level characters, such as the relative arrangements of genes, that can be especially powerful. We describe here the protocols commonly used for physically isolating mtDNA, for amplifying these by PCR or RCA, for cloning,sequencing, assembly, validation, and gene annotation, and for comparing both sequences and gene arrangements. On several topics, we offer general observations based on our experiences to date with determining and comparing complete mtDNA sequences.

  9. Social acceptance of comparative optimism and realism.

    Science.gov (United States)

    Milhabet, I; Verlhiac, J F

    2011-10-01

    Studies of optimism and realism (the accuracy of people's outlook on the future) seek to understand the respective effects of these elements on social approbation. Two experiments examined how comparative optimism (vs. pessimism) and realism (vs. unrealism) interacted to influence the targets' social acceptance based on their perceptions about the future. The results showed that realism, or accuracy of prediction, increased the positive social effects of a comparatively optimistic outlook on the future. In contrast, targets who exhibited comparative pessimism were more socially acceptable when their predictions were unrealistic rather than realistic. This phenomenon was examined by also considering the polarity of the events about which judgments were expressed. These results contribute to the body of research about the relationship between optimism and pessimism and the relationship between optimism and realism.

  10. A comparative study of various advanced fusions

    International Nuclear Information System (INIS)

    Momota, H.; Tomita, Y.; Nomura, Y.

    1983-01-01

    For the purpose of comparing the merits and demerits of various advanced fuel cycles, parametric studies of operation conditions are examined. The effects of nuclear elastic collisions and synchrotron radiation are taken into account. It is found that the high-#betta# Catalyzed DD fuel cycle with the transmutation of fusion-produced tritium into helium-3 is most feasible from the point of view of neutron production and tritium handling. The D-D fuel cycles seem to be less attractive compared to the Catalyzed DD. The p- 11 B and p- 6 Li fusion plasmas hardly attain the plasma Q value relevant to reactors. (author)

  11. Mathematics education and comparative historical studies

    Directory of Open Access Journals (Sweden)

    Wagner RODRIGUES VALENTE

    2013-11-01

    Full Text Available This paper has as its aims: to characterize the area of research «history of mathematics education» and to defend the idea that mathematics education has constituted a privileged research theme within the field of comparative historical studies. To achieve these aims, the text includes references to a review of the literature concerning comparative studies, the analysis of two fundamental moments focused on attempts to internationalize the mathematics curriculum, both of which occurred during the 20th century, and, to end, a case study emanating from an international cooperation between researchers in Brazil and Portugal.

  12. A Comparative of business process modelling techniques

    Science.gov (United States)

    Tangkawarow, I. R. H. T.; Waworuntu, J.

    2016-04-01

    In this era, there is a lot of business process modeling techniques. This article is the research about differences of business process modeling techniques. For each technique will explain about the definition and the structure. This paper presents a comparative analysis of some popular business process modelling techniques. The comparative framework is based on 2 criteria: notation and how it works when implemented in Somerleyton Animal Park. Each technique will end with the advantages and disadvantages. The final conclusion will give recommend of business process modeling techniques that easy to use and serve the basis for evaluating further modelling techniques.

  13. Comparative analysis of Carnaval II Library

    International Nuclear Information System (INIS)

    Santos Bastos, W. dos

    1981-01-01

    The Carnaval II cross sections library from the french fast reactor calculation system is evaluated in two ways: 1 0 ) a comparative analysis of the calculations system for fast reactors at IEN (Instituto de Engenharia Nuclear) using a 'benchmark' model is done; 2 0 ) a comparative analysis in relation to the french system itself is also done, using calculations realized with two versions of the french library: the SETR-II and the CARNAVAL IV, the first one being anterior and the second one posterior to the Carnaval II version, the one used by IEN. (Author) [pt

  14. Comparing Results from Constant Comparative and Computer Software Methods: A Reflection about Qualitative Data Analysis

    Science.gov (United States)

    Putten, Jim Vander; Nolen, Amanda L.

    2010-01-01

    This study compared qualitative research results obtained by manual constant comparative analysis with results obtained by computer software analysis of the same data. An investigated about issues of trustworthiness and accuracy ensued. Results indicated that the inductive constant comparative data analysis generated 51 codes and two coding levels…

  15. Comparative sonographic evaluation of the anteroposterior ...

    African Journals Online (AJOL)

    2015-09-21

    Sep 21, 2015 ... also significantly smaller in the Type 1 diabetics compared to Type 2 (P ... the duodenal loop and splenic hilum over a length of ... have demonstrated a decrease in beta cell mass.[4] ... also becomes resistant to insulin, thereby causing the blood ... DM poses a devastating negative economic impact and.

  16. Comparative study of bioethanol production from sugarcane ...

    African Journals Online (AJOL)

    The study was designed to compare the bioethanol production from Zymomonas mobilis and Saccharomyces cerevisiae using molasses as production medium. The focus was on the retention time at lab scale. Bioethanol and petroleum blend can be used in existing gasoline engines. Present study showed a more ...

  17. Comparable indicators of inequality across countries

    NARCIS (Netherlands)

    Nolan, B.; Marx, I.; Salverda, W.

    2011-01-01

    This paper addresses the key issue for the GINI project of how best to approach the measurement of income inequality and wage inequality to enhance comparability across different studies. It focuses fi rst on income inequality, dealing with the defi nition of income, the income recipient unit, and the

  18. Comparative Antioxidant, Antiproliferative and Apoptotic Effects of ...

    African Journals Online (AJOL)

    Purpose: To determine and compare the antioxidant, antiproliferative and apoptotic effects of leaf infusions of Ilex laurina ... Both plant infusions inhibited viability and cell growth of SW480 and SW620 cells. .... 100 g of dry extract, from a gallic acid calibration curve [9]. ..... antioxidant capacity and in vitro inhibition of colon.

  19. Comparative Studies on Some Physicochemical Properties of ...

    African Journals Online (AJOL)

    Industrial and nutritional processes have increased the demands for oil and this in turn has led to the search for oils from different types of seeds. It is in this vein that baobab seed oil was extracted, analyzed and some of it physicochemical properties compared with those of vegetable, peanut and palm oils. The percentage ...

  20. Comparative Economic Analysis of Beekeeping Using Traditional ...

    African Journals Online (AJOL)

    The study was carried out in Tabora and Katavi regions in the miombo woodlands of Tanzania. The overall objective of the study was to undertake a comparative economic analysis of beekeeping using improved or traditional beehives. Data were collected from 198 beekeepers that were randomly selected from a sampling ...

  1. A comparative study of fingerprint thinning algorithms

    CSIR Research Space (South Africa)

    Khanyile, NP

    2011-08-01

    Full Text Available are compared in terms of the quality of the skeletons they produce (i.e. connectivity and spurious branches) as well as the time complexity associated with each algorithm. Results show that faster algorithms have difficulty preserving connectivity. Zhang...

  2. Demographic development in ASEAN: a comparative overview.

    Science.gov (United States)

    Herrin, A N; Pardoko, H; Lim, L L; Hongladorom, C

    1981-01-01

    A comparative overview of recent demographic developments in the ASEAN (Association of Southeast Asian Nations) region is presented. Countries discussed include Indonesia, Malaysia, the Philippines, Singapore, and Thailand. Separate consideration is given to mortality; fertility; and migration, spatial distribution, and employment. A final section is concerned with emerging issues and directions for population policy.

  3. Comparative analysis of technical efficiencies between compound ...

    African Journals Online (AJOL)

    This study was designed to compare the level of technical efficiency in the compound and non compound farms in Imo state. A multi-stage random sampling technique was used to select 120 food crop farmers from two out of the three agricultural zones in Imo state. Using the Chow (1960) analysis of covariance technique ...

  4. Comparative Efficacy Of Topical Ciprofloxacin On Staphylococcus ...

    African Journals Online (AJOL)

    Ciprofloxacinis often considered drug of first choice in the treatment of bacterial keratitis.Most of the ocular infections are caused by Staphylococcus aureus and Pseudomonas aeruginosa. This study set to compare the efficacy of ciprofloxacin on these two microorganisms in vitro. The “agar well diffusion” and the 10-fold ...

  5. On the measurement of comparative advantage

    NARCIS (Netherlands)

    Hoen, A.R.; Oosterhaven, J.

    This paper shows-that the standard measure of revealed comparative advantage (RCA), ranging from 0 to infinity, has problematic properties. Due to its multiplicative specification, it has a moving mean larger than its expected value of 1, while its distribution strongly depends on the number of

  6. On the measurement of comparative advantage

    NARCIS (Netherlands)

    Hoen, Alex R.

    2001-01-01

    This article shows that the distribution of the standard measure of revealed comparative advantage (RCA), which runs from 0 to 8, has problematic properties. Due to its multiplicative specification, it has a moving mean without a useful interpretation, while its distribution depends on the number of

  7. Comparative morphology on leaves of Daphniphyllum (Daphniphyllaceae)

    NARCIS (Netherlands)

    Tang, M.-S.; Yang, Y.-P.; Sheue, C.-R.

    2009-01-01

    A comparative anatomical study on the leaves of nine out of 29 species of the genus Daphniphyllum was performed to seek support for the present infrageneric classification. Daphniphyllum is composed of two sections, Lunata (with one subsection Lunata) and Daphniphyllum (with two subsections,

  8. Statistical tests to compare motif count exceptionalities

    Directory of Open Access Journals (Sweden)

    Vandewalle Vincent

    2007-03-01

    Full Text Available Abstract Background Finding over- or under-represented motifs in biological sequences is now a common task in genomics. Thanks to p-value calculation for motif counts, exceptional motifs are identified and represent candidate functional motifs. The present work addresses the related question of comparing the exceptionality of one motif in two different sequences. Just comparing the motif count p-values in each sequence is indeed not sufficient to decide if this motif is significantly more exceptional in one sequence compared to the other one. A statistical test is required. Results We develop and analyze two statistical tests, an exact binomial one and an asymptotic likelihood ratio test, to decide whether the exceptionality of a given motif is equivalent or significantly different in two sequences of interest. For that purpose, motif occurrences are modeled by Poisson processes, with a special care for overlapping motifs. Both tests can take the sequence compositions into account. As an illustration, we compare the octamer exceptionalities in the Escherichia coli K-12 backbone versus variable strain-specific loops. Conclusion The exact binomial test is particularly adapted for small counts. For large counts, we advise to use the likelihood ratio test which is asymptotic but strongly correlated with the exact binomial test and very simple to use.

  9. Wellness Model of Supervision: A Comparative Analysis

    Science.gov (United States)

    Lenz, A. Stephen; Sangganjanavanich, Varunee Faii; Balkin, Richard S.; Oliver, Marvarene; Smith, Robert L.

    2012-01-01

    This quasi-experimental study compared the effectiveness of the Wellness Model of Supervision (WELMS; Lenz & Smith, 2010) with alternative supervision models for developing wellness constructs, total personal wellness, and helping skills among counselors-in-training. Participants were 32 master's-level counseling students completing their…

  10. Comparing early design methods for children

    NARCIS (Netherlands)

    Sluis - Thiescheffer, R.J.W.; Bekker, M.M.; Eggen, J.H.; Robertson, J.; Skov, M.B.; Bekker, M.M.

    2007-01-01

    This paper describes a study which compares the outcome of two early design methods for children: brainstorming and prototyping. The hypothesis is that children will uncover more design ideas when prototyping than when brainstorming, because prototyping requires the use of a wider range of

  11. Papers from the International Conference on Comparative ...

    African Journals Online (AJOL)

    on different specific themes and four poster sessions gener- ally coordinated with each day's themes. The following nine papers are a representative sample of both plenary and review papers presented. Comparative animal physiology and biochemistry are areas of study largely concerned with the ways in which diverse.

  12. China and India, 2025: A Comparative Assessment

    Science.gov (United States)

    2011-01-01

    in China, see Banister, Bloom, and Rosenberg (2010). 13 For a discussion of inequality in India, see Bardhan (2003). population trends in China and...WorkingPapers/2010/PGDA_WP_53.pdf 132 China and India, 2025: A Comparative Assessment Bardhan , Pranab, “Crouching Tiger, Lumbering Elephant: A China-India

  13. Comparative Genomics of Green Sulfur Bacteria

    DEFF Research Database (Denmark)

    Ussery, David; Davenport, C; Tümmler, B

    2010-01-01

    Eleven completely sequenced Chlorobi genomes were compared in oligonucleotide usage, gene contents, and synteny. The green sulfur bacteria (GSB) are equipped with a core genome that sustains their anoxygenic phototrophic lifestyle by photosynthesis, sulfur oxidation, and CO(2) fixation. Whole...... weight of 10(6), and are probably instrumental for the bacteria to generate their own intimate (micro)environment....

  14. A comparative study of map use

    DEFF Research Database (Denmark)

    Bouvin, Niels Olof; Brodersen, Ann Christina; Bødker, Susanne

    2006-01-01

    We present a study comparing the handling of three kinds of maps, each on a physical device: a paper map, a tablet-PC based map, and a cellular phone based one. Six groups of users were asked to locate eight landmarks, looking out a window, and using a particular map. We have begun analyzing video...

  15. The downstream industry compared to market

    International Nuclear Information System (INIS)

    Chevallier, B.

    2010-01-01

    J.L. Schilansky introduces here the difficult question of the downstream industry compared to market in recalling the recent structural changes (behaviour of customers, behaviour of the USA- and China-governments), the increase of the European and French regulations, the climatic change and the conjectural impact of the crisis on the refining industry. (O.M.)

  16. Comparative assessment of university chemistry undergraduate ...

    African Journals Online (AJOL)

    A comparative analysis of the structure of undergraduate chemistry curricula of universities in the southwest of Nigeria with a view to establishing the relative proportion of the different areas of chemistry each curriculum accommodates. It is a qualitative research, involving content analysis with a partial quantitative analysis ...

  17. Comparative evaluation on some available Newcastle disease ...

    African Journals Online (AJOL)

    Newcastle disease vaccines from three different countries were compared in terms of the level of protection conferred on domestic chickens against Newcastle disease (ND) following routine vaccinations. One hundred and fifty day old chicks were acquired and divided into three groups, with each group of fifty chickens ...

  18. Comparative Education in the Nineteenth Century

    Science.gov (United States)

    Brickman, William W.

    2010-01-01

    In this previously unpublished essay, William W. Brickman complicates the traditional conception of the historical foundations of comparative education--that is, the role of Marc-Antoine Julian as a "father figure." The article examines influences on Julian (by Cesar-Auguste Basset's influential publications, for example) and discusses…

  19. Comparative Approaches to Genetic Discrimination: Chasing Shadows?

    Science.gov (United States)

    Joly, Yann; Feze, Ida Ngueng; Song, Lingqiao; Knoppers, Bartha M

    2017-05-01

    Genetic discrimination (GD) is one of the most pervasive issues associated with genetic research and its large-scale implementation. An increasing number of countries have adopted public policies to address this issue. Our research presents a worldwide comparative review and typology of these approaches. We conclude with suggestions for public policy development. Copyright © 2017 Elsevier Ltd. All rights reserved.

  20. Counseling in Costa Rica: A Comparative Study

    Science.gov (United States)

    Collier, Crystal

    2013-01-01

    With one of the world's most comprehensive universal healthcare systems, medical tourism in Costa Rica has increased significantly over the past few decades. American tourists save up to 80% of comparative costs for procedures, from heart surgery to root canal treatment. Although many Costa Rican healthcare professionals receive training in North…

  1. A comparative assessment of commonly employed staining ...

    African Journals Online (AJOL)

    Following an increase in the number of reports of Cryptosporidium infections and the problems encountered in detecting these organisms in faecal smears, a comparative assessment of a modification of the Sheather's flotation technique and other commonly employed staining procedures proved the modified Sheather's ...

  2. COMPARATIVE EFFICACY OF Acorus calamus POWDER AND ...

    African Journals Online (AJOL)

    The efficacy of the powder of a natural plant product (Acorus calamus L.) and two synthetic insecticides (i.e. Pirimiphos methyl and Rotenone) was compared in the laboratory for the control Sitophilus oryzea (L), Rhizopertha dominica (F) and Tribolium castaneum (Herbst) in stored wheat grains. Seven concentrations of the ...

  3. Comparing Syntactic and Semantics Action Refinement

    NARCIS (Netherlands)

    Goltz, Ursula; Gorrieri, Roberto; Rensink, Arend

    The semantic definition of action refinement on labelled configuration structures is compared with the notion of syntactic substitution, which can be used as another notion of action refinement in a process algebraic setting. The comparison is done by studying a process algebra equipped with

  4. Comparative antitrypanosomal screening of methanolic extracts of ...

    African Journals Online (AJOL)

    The in vitro and in vivo activities of methanolic extracts of defatted leaves and stems of Khaya senegalensis and Moringa oleifera on Trypanosoma brucei brucei were investigated and compared. The in vitro assessment involved incubating the parasite (in triplicate) in the presence of various extract concentrations in a ...

  5. 45 CFR 86.33 - Comparable facilities.

    Science.gov (United States)

    2010-10-01

    ... SEX IN EDUCATION PROGRAMS OR ACTIVITIES RECEIVING FEDERAL FINANCIAL ASSISTANCE Discrimination on the Basis of Sex in Education Programs or Activities Prohibited § 86.33 Comparable facilities. A recipient... the other sex. (Secs. 901, 902, Education Amendments of 1972, 86 Stat. 373, 374) ...

  6. Comparative risks in the energy scene

    International Nuclear Information System (INIS)

    Cohen, A.V.

    1981-01-01

    Studies comparing the risks in different energy systems are discussed, and the usefulness of the quantified risk assessment to the decision maker is outlined. Information is presented on (a) risks from fuel extraction, processing and fabrication (for coal, oil and nuclear); (b) annual risk per unit output (coal, oil and nuclear); (c) major events (nuclear, coal, oil and chemical). (U.K.)

  7. Comparing classifiers for pronunciation error detection

    NARCIS (Netherlands)

    Strik, H.; Truong, K.; Wet, F. de; Cucchiarini, C.

    2007-01-01

    Providing feedback on pronunciation errors in computer assisted language learning systems requires that pronunciation errors be detected automatically. In the present study we compare four types of classifiers that can be used for this purpose: two acoustic-phonetic classifiers (one of which employs

  8. A comparative study of microbiological and physicochemical ...

    African Journals Online (AJOL)

    A comparative study of microbiological and physicochemical characteristics of water distributed from two water treatment plants in Rwanda. ... Thus, as recommendation to WASAC authority, there is a need for improvement in the water management strategy for better water quality especially along the distribution network.

  9. The comparative ecology and biogeography of parasites

    Science.gov (United States)

    Poulin, Robert; Krasnov, Boris R.; Mouillot, David; Thieltges, David W.

    2011-01-01

    Comparative ecology uses interspecific relationships among traits, while accounting for the phylogenetic non-independence of species, to uncover general evolutionary processes. Applied to biogeographic questions, it can be a powerful tool to explain the spatial distribution of organisms. Here, we review how comparative methods can elucidate biogeographic patterns and processes, using analyses of distributional data on parasites (fleas and helminths) as case studies. Methods exist to detect phylogenetic signals, i.e. the degree of phylogenetic dependence of a given character, and either to control for these signals in statistical analyses of interspecific data, or to measure their contribution to variance. Parasite–host interactions present a special case, as a given trait may be a parasite trait, a host trait or a property of the coevolved association rather than of one participant only. For some analyses, it is therefore necessary to correct simultaneously for both parasite phylogeny and host phylogeny, or to evaluate which has the greatest influence on trait expression. Using comparative approaches, we show that two fundamental properties of parasites, their niche breadth, i.e. host specificity, and the nature of their life cycle, can explain interspecific and latitudinal variation in the sizes of their geographical ranges, or rates of distance decay in the similarity of parasite communities. These findings illustrate the ways in which phylogenetically based comparative methods can contribute to biogeographic research. PMID:21768153

  10. Comparative Biography, English: 5113.94.

    Science.gov (United States)

    Dade County Public Schools, Miami, FL.

    Developed for a high school quinmester unit on comparative biography, this guide provides the teacher with strategies to aid students in examining biography from "Plutarch's Lives" and Cellini's "Autobiography" to Nabokoc's "Speak, Memory." Special emphasis is placed on comparison of biographies of the same person and…

  11. Comparative, Diachronic, Ethnographic Research on Education

    Science.gov (United States)

    Tobin, Joseph

    2014-01-01

    Most qualitative studies in international education take place in a single site in a single nation. When studies are of more than one country, they most often use more quantitative than qualitative approaches. Beatrice and John Whiting conducted the most systematic of comparative cross-cultural studies of child rearing in their "Six…

  12. Supplementary data: Comparative studies on sequence ...

    Indian Academy of Sciences (India)

    Unknown

    Page 1. Supplementary data: Comparative studies on sequence characteristics around translation initiation codon in four eukaryotes. Qingpo Liu and Qingzhong Xue. J. Genet. 84, 317–322. Table 1. Spearman's rank correlation coefficients of 39 base positions around the AUG codon in the four eukaryotic species studied.

  13. Comparative Dissolution Profiles of Representative Quinolones in ...

    African Journals Online (AJOL)

    The %Q of Ciprofloxacin(CP) and 3 0 Sparfloxacin(SP) was found to conform entirely to both USP2004 and FDA specifications. Sparfloxacin was found to be unstable due to cloudiness observed in 0.1N HCl medium. The CP and SP showed highest %Q in 0.1M max acetic acid compared to other media. This result has

  14. Comparative evaluation of organic formulations of Pseudomonas ...

    African Journals Online (AJOL)

    Jane

    2011-07-20

    Jul 20, 2011 ... on the basis of comparative longer shelf life of the biocontrol bacteria. Storage condition of 4°C was ..... Islam and Toyota (2004) reported higher ..... better competitive advantage over other rhizosphere microflora (Loper et al., ...

  15. Traveling Chaucer: Comparative Translation and Cosmopolitan Humanism

    Science.gov (United States)

    Barrington, Candace

    2014-01-01

    Through the comparative study of non-Anglophone translations of Geoffrey Chaucer's "The Canterbury Tales," we can achieve the progressive goals of Emily Apter's "translational transnationalism" and Edward Said's "cosmopolitan humanism." Both translation and humanism were intrinsic to Chaucer's…

  16. Comparative evaluation of mineral trioxide aggregate and ...

    African Journals Online (AJOL)

    MTA) as an apical barrier material are limited, and no studies have so far examined the clinical performance of BioAggregate as apical barrier material in nonvital immature teeth. Aim: This study was aimed to provide a comparative evaluation of ...

  17. Comparing the achievement goal orientation of mathematics ...

    African Journals Online (AJOL)

    Comparing the achievement goal orientation of mathematics learners with and without attention-deficit hyperactivity disorder. ... in recognising methods to direct learners' goals for better engagement with and improved results in mathematics, which could support learners to develop to their full potential in the subject.

  18. Higher Education in Greece Compared to Canada

    Science.gov (United States)

    Miliotis, Helen

    2014-01-01

    This paper compares and contrasts higher education in Canada and Greece. An overview of the systems in place is followed by an analysis centred on the triad of funding, access and quality. Similarities and differences are highlighted, and the current challenges and issues faced by both nations will be examined, especially in terms of world…

  19. Comparative study of quantum anharmonic potentials

    International Nuclear Information System (INIS)

    Amore, Paolo; Aranda, Alfredo; De Pace, Arturo; Lopez, Jorge A.

    2004-01-01

    We perform a study of various anharmonic potentials using a recently developed method. We calculate both the wave functions and the energy eigenvalues for the ground and first excited states of the quartic, sextic and octic potentials with high precision, comparing the results with other techniques available in the literature

  20. MycoCAP - Mycobacterium Comparative Analysis Platform.

    Science.gov (United States)

    Choo, Siew Woh; Ang, Mia Yang; Dutta, Avirup; Tan, Shi Yang; Siow, Cheuk Chuen; Heydari, Hamed; Mutha, Naresh V R; Wee, Wei Yee; Wong, Guat Jah

    2015-12-15

    Mycobacterium spp. are renowned for being the causative agent of diseases like leprosy, Buruli ulcer and tuberculosis in human beings. With more and more mycobacterial genomes being sequenced, any knowledge generated from comparative genomic analysis would provide better insights into the biology, evolution, phylogeny and pathogenicity of this genus, thus helping in better management of diseases caused by Mycobacterium spp.With this motivation, we constructed MycoCAP, a new comparative analysis platform dedicated to the important genus Mycobacterium. This platform currently provides information of 2108 genome sequences of at least 55 Mycobacterium spp. A number of intuitive web-based tools have been integrated in MycoCAP particularly for comparative analysis including the PGC tool for comparison between two genomes, PathoProT for comparing the virulence genes among the Mycobacterium strains and the SuperClassification tool for the phylogenic classification of the Mycobacterium strains and a specialized classification system for strains of Mycobacterium abscessus. We hope the broad range of functions and easy-to-use tools provided in MycoCAP makes it an invaluable analysis platform to speed up the research discovery on mycobacteria for researchers. Database URL: http://mycobacterium.um.edu.my.

  1. Comparing uncertainty aversion towards different sources

    NARCIS (Netherlands)

    Baillon, Aurélien; Liu, Ning; van Dolder, Dennie

    2017-01-01

    We propose simple behavioral definitions of comparative uncertainty aversion for a single agent towards different sources of uncertainty. Our definitions allow for the comparison of utility curvature for different sources if the agent’s choices satisfy subjective expected utility towards each

  2. Comparative effects of imipramine, sertraline, nifedipine, furosemide ...

    African Journals Online (AJOL)

    The objective of the study was to evaluate the comparative effects of imipramine, sertraline, nifedipine, furosemide and bumetanide on ingestive behavior in rodents. Twelve groups (with six in each group) of male mice (25 to 35 g) were used in the experiments. They were housed in labelled plastic cages in the departmental ...

  3. Thinking about Gender in Comparative Education

    Science.gov (United States)

    Unterhalter, Elaine

    2014-01-01

    Comparative and international education has been both a particularly generative area for the exploration of themes in relation to gender and education, but has also tended to impose limits regarding how gender and education are understood. In reflecting critically on the history of my own work in this field, and some of the early scholarship of…

  4. Comparing survival curves using rank tests

    NARCIS (Netherlands)

    Albers, Willem/Wim

    1990-01-01

    Survival times of patients can be compared using rank tests in various experimental setups, including the two-sample case and the case of paired data. Attention is focussed on two frequently occurring complications in medical applications: censoring and tail alternatives. A review is given of the

  5. Comparing transformation methods for DNA microarray data

    NARCIS (Netherlands)

    Thygesen, Helene H.; Zwinderman, Aeilko H.

    2004-01-01

    Background: When DNA microarray data are used for gene clustering, genotype/phenotype correlation studies, or tissue classification the signal intensities are usually transformed and normalized in several steps in order to improve comparability and signal/noise ratio. These steps may include

  6. Comparative Gender Performance in Business Statistics.

    Science.gov (United States)

    Mogull, Robert G.

    1989-01-01

    Comparative performance of male and female students in introductory and intermediate statistics classes was examined for over 16 years at a state university. Gender means from 97 classes and 1,609 males and 1,085 females revealed a probabilistic--although statistically insignificant--superior performance by female students that appeared to…

  7. Calcaneal fracture classification: a comparative study

    NARCIS (Netherlands)

    Schepers, Tim; van Lieshout, Esther M. M.; Ginai, Abida Z.; Mulder, Paul G. H.; Heetveld, Martin J.; Patka, Peter

    2009-01-01

    Comparing different types of calcaneal fractures, associated treatment options, and outcome data is currently hampered by the lack of consensus regarding fracture classification. A systematic search for articles dealing with calcaneal fracture was performed, and the prevalence of use of each

  8. Comparative Antioxidant, Antiproliferative and Apoptotic Effects of ...

    African Journals Online (AJOL)

    Purpose: To determine and compare the antioxidant, antiproliferative and apoptotic effects of leaf infusions of Ilex laurina and Ilex paraguariensis in colon cancer cells. Methods: Antioxidant activity was determined by ORAC (Oxygen Radical Absorbance Capacity) and FRAP (Ferric Reducing Antioxidant Power). Cytotoxic ...

  9. Comparative periodontal status of human immunodeficiency virus ...

    African Journals Online (AJOL)

    Nigerian Journal of Clinical Practice • Jan-Feb 2016 • Vol 19 • Issue 1. Abstract .... Helsinki and was approved by the Health Research and. Ethics Committee of the Institution. Study design. This was a comparative cross‑sectional, analytical study carried out at a ..... probing depths and gingival marginal recession.[13].

  10. Comparative periodontal status of human immunodeficiency virus ...

    African Journals Online (AJOL)

    Background: There are diverse reports on the prevalence and severity of chronic periodontitis in human immunodeficiency virus (HIV) positive persons. Few studies have been carried out in developing countries in Sub.Saharan Africa. This study was aimed at comparing the prevalence and severity of chronic periodontitis of ...

  11. Comparing Face Detection and Recognition Techniques

    OpenAIRE

    Korra, Jyothi

    2016-01-01

    This paper implements and compares different techniques for face detection and recognition. One is find where the face is located in the images that is face detection and second is face recognition that is identifying the person. We study three techniques in this paper: Face detection using self organizing map (SOM), Face recognition by projection and nearest neighbor and Face recognition using SVM.

  12. Comparative effectiveness of malaria preventive measures on ...

    African Journals Online (AJOL)

    The burden of malaria and its associated problems in pregnancy can be reduced by the use of different malaria preventive measures. This study was conducted to determine the comparative effectiveness of three different malaria preventive measures on populations of parturient in Abeokuta, Ogun State, Nigeria.

  13. Comparative efficacy of progressive resistance exercise and ...

    African Journals Online (AJOL)

    Background: Progressive Resistance Exercise (PRE) and Biomechanical Ankle Platform System (BAPS) are two of the protocols available in managing children with Cerebral Palsy (CP). The comparative effects of these modalities on selected functional indices of ambulatory type CP were the focus of this study. Methods: ...

  14. Comparative study of potato cultivation through micropropagation ...

    African Journals Online (AJOL)

    sonu

    Comparative study of potato cultivation through micropropagation and conventional farming methods .... and Murate potash were used as fertilizer source of nitrogen, phosphorus and potassium, respectively (Table 1) ..... through Tissue culture- Application and Feasibility. U.S.D.A.,. Beltsville. Agric. Res. Sci. Educ. Admin.

  15. Rodent malaria parasites : genome organization & comparative genomics

    NARCIS (Netherlands)

    Kooij, Taco W.A.

    2006-01-01

    The aim of the studies described in this thesis was to investigate the genome organization of rodent malaria parasites (RMPs) and compare the organization and gene content of the genomes of RMPs and the human malaria parasite P. falciparum. The release of the complete genome sequence of P.

  16. Comparative oncology: Integrating human and veterinary medicine ...

    African Journals Online (AJOL)

    Cancer constitutes the major health problem both in human and veterinary medicine. Comparative oncology as an integrative approach offers to learn more about naturally occurring cancers across different species. Canine models have many advantages as they experience spontaneous disease, have many genes similar ...

  17. Comparative Immunologic Activities of Polyclonal Antibodies ...

    African Journals Online (AJOL)

    Three types of Vibrio cholerae (El tor, Ogawa) whole cell antigens constituted with liquid paraffin adjuvant (LPA), Freund's incomplete adjuvant (FIA) and physiological saline (SA) were used for polyclonal antisera production in adult rabbits. Antisera were compared for serologic reactivities with homologous and ...

  18. Comparative Erythrocytes Osmotic Fragility Test and some ...

    African Journals Online (AJOL)

    Erythrocytes osmotic fragility and haematological parameters of subjects with HbAS (sickle cell trait) and HbSS (sickle cell anaemia) were determined and compared with subjects with HbAA (normal adult haemoglobin), which acted as control. They were divided into three groups of 40 subjects for HbAA, 35 subjects for ...

  19. The Teaching of Anthropology: A Comparative Study.

    Science.gov (United States)

    Lombard, Jacques

    1984-01-01

    College-level anthropology teaching in various countries, including Belgium, France, Germany, the Netherlands, Portugal, South Africa, the United Kingdom, and Yugoslavia, is compared. Terminology is examined and historical background is provided. Also discussed are educational crises, the organization of teaching, and teaching methods. (RM)

  20. 1991 comparative analysis of tritium in water

    International Nuclear Information System (INIS)

    Krause, W.J.; Mundschenk, H.

    1992-06-01

    For environmental monitoring of radioactive materials, the competent authorities of the States and Federal Government of Germany continuously perform measurements and make their results accessible to the public in an appropriate way. In order to guarantee the comparability of measured values and a high degree of reliability of the applied methods, the authorities in charge of carrying out such tasks are obliged to take part in the comparative analyses (ring tests) organized by the central offices of the Federal Government. Therefore, the aim of this comparative analysis performed by order of the Federal Ministry of the Environment, Nature Protection and Reactor Safety consists mainly in providing the measuring offices in charge of monitoring waters, with samples with known tritium contents in order to get an overview of the accuracy of currently used processes; check the accuracy of the determinations performed, and, if necessary, detect and eliminate systematic errors; check, in particular by means of the samples T2 and T3, the calibration of the measuring devices and, if necessary, make corrections. To this effect, the comparative analysis fulfills the function of quality control of the processes used in environmental monitoring. (orig./BBR) [de

  1. HSMR : Comparing Death Rates Across UK Hospitals

    NARCIS (Netherlands)

    Ben Teeuwen; Thuy Ngo; Frans Nauta

    2011-01-01

    The Hospital Standardized Mortality Ratio (HSMR) is a measurement tool that shows hospitals’ death rates. The HSMR compares deaths that occur in hospitals with death ratios that one would normally expect based on patients’ diseases. It is used as a benchmark for adjusted hospital death rates. These

  2. Data base to compare calculations and observations

    International Nuclear Information System (INIS)

    Tichler, J.L.

    1985-01-01

    Meteorological and climatological data bases were compared with known tritium release points and diffusion calculations to determine if calculated concentrations could replace measure concentrations at the monitoring stations. Daily tritium concentrations were monitored at 8 stations and 16 possible receptors. Automated data retrieval strategies are listed

  3. Appraising and comparing pressure ulcer guidelines.

    Science.gov (United States)

    Wimpenny, Peter; van Zelm, Ruben

    2007-01-01

    Whilst considerable activity has been related to guideline development for nurses regarding pressure ulcer prevention and management, no attempt has been made to comparatively evaluate these guidelines against some form of quality indicators. To compare and contrast four national pressure ulcer guidelines, and identify similarities and differences in their quality and content. An international comparative appraisal method, using the AGREE (Appraisal of Guidelines Research and Evaluation) instrument, was undertaken to appraise four published pressure ulcer guidelines. Two further domains were added to the AGREE instrument to assess comparability of the guidelines and their perceived contribution to practice. An international group undertook the comparative appraisal. The domain scores for each guideline show some but not total agreement among reviewers. One particular set of guidelines was identified as scoring highest in a majority of AGREE domains. Overall, evidence of variability exists between pressure ulcer guidelines and common areas of development to consider for all guidelines. The results raise many questions concerning the "best" pressure ulcer guideline to use, particularly related to the AGREE scoring. Some notable shortcomings exist in all the pressure ulcer guidelines reviewed and these shortcomings need to be addressed from a quality perspective. However, other issues such as style of reporting and potential contribution to practice might more fully affect choice by practitioners as opposed to guideline developers. Notable differences exist among the four guidelines that are possibly explained by different approaches to development and also because of different cultural factors and intentions for use. Whilst the AGREE tool identifies the quality of the guideline development process it still requires local engagement with practitioners to determine which guideline should be implemented.

  4. Zeolite and wollastonite synthesis from rice hull ash; Sintese de zeolitas e wolastonita a partir da cinza da casca de arroz

    Energy Technology Data Exchange (ETDEWEB)

    Fernandes, Alberto de Andrade

    2006-07-01

    Rice hull ash (RHA) is a industry scrap rich in amorphous silica. A simple and low-energy cost method for the extraction of this silica was researched. A low level of impurity and high reactivity material was produced, which is appropriate for the synthesis of zeolites and wollastonite (CaSiO{sub 3}). The synthetic zeolites has not similar structures in nature, and they have been more and more valued in the market due to their purity and efficiency in specific applications like ion exchange, molecular sieve and catalysis areas. High purity wollastonite has many applications in manufacturing and agriculture. The mineral wollastonite can be formed in nature in different ways; it is generally accepted two forming processes, both encompassing limestone metamorphism (heat and pressure). In this work, a new process for the synthesis of zeolites and wollastonite from RHA colloidal silica was developed. Moreover, the process is aimed at lower energy costs, fewer stages and fewer reactants consume. In this work, zeolite A used in detergent and zeolite ZSM-5, employed in the petrochemical industry due to its high selectivity in catalytic reactions and its high thermo and acid stability, were synthesized. The first step of the wollastonite synthesis was studied, with the purpose of obtaining calcium hydrosilicate. Eleven different hydrosilicates occur in the system Ca(OH){sub 2}-SiO{sub 2}-H{sub 2}O, in the second step it was annealed to form the wollastonite phase. (author)

  5. Mechanical behavior of cementitious composites with processed sugar cane bagasse ashes; Comportamento mecanico de cimento Portland com cinza de bagaco de cana-de-acucar processada

    Energy Technology Data Exchange (ETDEWEB)

    Bezerra, Augusto C.S.; Saraiva, Sergio L.C.; Sena, Natalia O.; Pereira, Gabriela M.; Rodrigues, Conrado S.; Ferreira, Maria C.N.F., E-mail: augustobezerra@des.cefetmg.br [Centro Federal de Educacao Tecnologica Minas Gerais (CEFET-MG), MG (Brazil); Castro, Laurenn W.A.; Silva, Marcos V.M.S. [Companhia Energetica de Minas Gerais, MG (Brazil); Gomes, Romero C. [Universidade Federal de Ouro Preto (UFOP), MG (Brazil); Aguilar, Maria T.P. [Universidade Federal de Minas Gerais (UFMG), MG (Brazil)

    2014-07-01

    Sugar cane bagasse is waste from the sugar and ethanol industry and is primarily intended for burning in boilers to generate energy. As waste from the cogeneration of energy, sugar cane bagasse ashes (SCBA) are produced with no honorable destination. This paper studies the use of SCBA to partially replace Portland cement in producing cementitious composites. The ashes were processed by reburning and grinding, and after processing were characterized by a scanning electron microscope, x-ray diffraction, laser granulometry, and x-ray fluorescence spectrometry. After characterization, cement compounds were fashioned, replacing 0, 10, 20 and 30% of the cement with SCBA. The composites were mechanically evaluated by means of compression strength tests, tensile strength tests by bending. The results proved significant, indicating the possible use of SCBA when added to the cement on manufacture. (author)

  6. Influence of calcination temperature in pozolanicity of gray sugar cane bagasse; Influencia da temperatura de calcinacao na pozolanicidade da cinza de bagaco de cana-de-acucar (CBCA))

    Energy Technology Data Exchange (ETDEWEB)

    Santos, T.A.; Argolo, R.A.; Andrade, H.M.C.; Ribeiro, D.V., E-mail: tiagoassuncao@hotmail.com [Universidade Federal da Bahia (UFBA), Salvador, BA (Brazil)

    2016-07-01

    BCA (Sugar Cane Bagasse) is burned in boilers in the process of electricity cogeneration causing the generation of CBCA (Gray Sugar Cane Bagasse), which is the final residue of sucroalcooeira industry. Currently, several studies seek alternative materials that can replace Portland cement, promoting discussions on the use of pozzolanic materials in cementitious matrices. Thus, this research seeks to analyze the pozzolanicity the CBCA, obtained by calcining the residue at different temperatures, to be determined by TG / DTG and DTA tests. For analysis of pozzolanicity these ashes were used electrical conductivity techniques, chemical titration NP EN 196-5, chapelle modified NBR 15895/2010 and the IAP method (Activity Index pozzolanic NBR:5752). The results obtained during the study demostraramm no difference between the ash calcined at temperatures of 500 ° C, 600 ° C and 700 ° C. (author)

  7. Avaliação da atividade pozolânica da cinza pesada moída em pastas de cimento Portland

    OpenAIRE

    Pilar, Ronaldo

    2012-01-01

    Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia Civil O uso de adições minerais finamente moídas em substituição parcial do clínquer é prática comum na produção de cimento Portland. Normalmente estas substituições estão amparadas por razões técnicas, econômicas e ambientais. Embora já se tenha conhecimento de uma vasta gama de materiais que possuem propriedades pozolânicas, ainda existem alguns com grande disponib...

  8. Synthesis and characterization of zeolite material from coal ashes modified by surfactant; Sintese e caracterizacao de material zeolitico de cinzas de carvao modificado por surfactante

    Energy Technology Data Exchange (ETDEWEB)

    Fungaro, D.A., E-mail: dfungaro@ipen.b [Instituto de Pesquisas Energeticas e Nucleares (CQMA/IPEN/CNEN-SP), Sao Paulo, SP (Brazil). Centro de Quimica e Meio Ambiente; Borrely, S.I. [Instituto de Pesquisas Energeticas e Nucleares (CTR/IPEN/CNEN-SP), Sao Paulo, SP (Brazil). Centro de Tecnologia das Radiacoes

    2010-07-01

    Coal ash was used as starting material for zeolite synthesis by means of hydrothermal treatment. The surfactant-modified zeolite (SMZ) was prepared by adsorbing the cationic surfactant hexadecyltrimethylammonium bromide (HDTMA-Br) on the external surface of the zeolite from coal ash. The zeolite structure stability was monitored during the characterization of the materials by FTIR, XDR and SEM. The structural parameters of surfactant-modified zeolite are very close to that of corresponding non-modified zeolite which indicates that the crystalline nature of the zeolite remained intact after required chemical treatment with HDTMA-Br molecules and heating treatment for drying. The most intense peaks in the FTIR spectrum of HDTMA-Br were observed in SMZ spectrum confirming adsorption of surfactant on zeolites. (author)

  9. Investigando cinza da casca do arroz como fase estacionária em cromatografia: uma proposta de aula experimental nos cursos de graduação

    Directory of Open Access Journals (Sweden)

    João R. de Freitas Filho

    2012-01-01

    Full Text Available This article describes an experiment that involves the extraction and separation of the pigments of spinach extract by column chromatography using the silica obtained from rice husk ash as a stationary phase. The experimental procedure is very simple to apply in the chemistry laboratory, and allowed to illustrate some concepts of organic chemistry: structure of organic molecules, solubility, polarity, extraction, partition coefficient, adsorption and retention factor (Rf, as well as objectives and fundamentals of chromatographic methods. The experiment can be carried out in a 4 h period.

  10. Characterization of sugar cane bagasse ash as raw material for the production of ceramics; Caracterizacao de cinzas de bagaco de cana como materia prima para producao de ceramica

    Energy Technology Data Exchange (ETDEWEB)

    Fredericci, C.; Indelicato, R.L.; Ferreira Neto, J.B.; Ribeiro, T.R.; Landgraf, F.J.G., E-mail: catiaf@ipt.br [Instituto de Pesquisas Tecnologicas do Estado de Sao Paulo (IPT), Sao Paulo, SP (Brazil). Lab. de Metalurgia e Materiais Ceramicos; Silva, G.F.B. Lenz e [Universidade de Sao Paulo (Poli/USP), Sao Paulo, SP (Brazil). Escola Politecnica. Departamento de Engenharia Metalurgica e de Materiais

    2012-07-01

    The aim of this paper was to analyze the sugar cane bagasse ash from three Sugar and Alcohol Plant of the State of Sao Paulo - Brazil. We intend to show the discrepancies between them, so that this raw material could be used with greater quality control in ceramic industries. The bagasse were analyzed by differential scanning calorimetry (DSC), thermogravimetry (TG) and scanning electron microscopy. The ashes were analyzed by X-ray diffraction, X-ray fluorescence, scanning electron microscopy, energy dispersive spectroscopy, and granulometric separation. The results indicated that the content of SiO{sub 2} ranging from 50-80% by weight depends on the granulometry of the bagasse and on the region where it was collected. The analyses of X-ray diffraction indicate SiO{sub 2}, Fe{sub 2}O{sub 3}, K{sub 2}SO{sub 4} and Mg{sub 2}P{sub 2}O{sub 7} as crystalline phases. (author)

  11. Characterization of red ceramic pastes incorporated with sugarcane bagasse ash wastes; Caracterizacao de massa ceramica vermelha incorporada com residuo de cinzas de bagaco de cana-de-acucar

    Energy Technology Data Exchange (ETDEWEB)

    Faria, K.C.P.; Gurgel, R.F.; Holanda, J.N.F., E-mail: katiacpfaria@hotmail.co, E-mail: holanda@uenf.b [Universidade Estadual do Norte Fluminense (LAMAV/UENF), Campos dos Goytacazes, RJ (Brazil). Lab. de Materiais Avancados. Grupo de Materiais Ceramicos

    2010-07-01

    The alcohol industry is one sector that stands out most in the Brazilian agribusiness. Currently there is an increasing demand for sugar and ethanol for use as fuel. The processes of manufacturing these products generate large amounts of waste, the sugarcane bagasse ash waste one of the most abundant. For its chemical and mineralogical characteristics, this waste has aroused the interest of its reuse in the field of red ceramic. This study analyzes the characteristics of a red ceramic paste incorporated with up to 20 wt.% of waste. The following characteristics were performed: chemical composition, X-ray diffraction, particle size, morphology, and Atterberg limits. The results show that the incorporation of sugarcane bagasse ash waste influences the physical-chemical and mineralogical characteristics of red ceramic paste. (author)

  12. AVALIAÇÃO TÉCNICA E ECONÔMICA DO REÚSO DE ÁGUAS CINZAS EM APARELHOS SANITÁRIOS

    Directory of Open Access Journals (Sweden)

    Renata Medici Frayne Cuba

    2014-10-01

    Full Text Available Based in environmental regulations of gray water reclamation, this study aimed to assess the technical and economical feasibility of the use of water from washing machines in domestic toilet flush. The research took ten months and was developed in a residence with four inhabitants, been three adults and a child. Low cost commercial materials were used in the experimental facility. As a result, it was possible to use a mean volume of 3,000 liters of water in a monthly basis. As a consequence of the low cost, a system like this can be paid in 22 months depending on water fares.

  13. Aplicação de cinzas residuais e de fibra de sisal na produção de argamassas e concretos: Revisão

    OpenAIRE

    Indara Soto Izquierdo; Marcio Antonio Ramalho

    2014-01-01

    The industrial development linked to the growing addiction to con - sumption, obsession with fossil fuels, and general desire for short term profit, cause a certain insensitivity to more sustainable alternatives. The construction industry is a sector in which the incorporation of various types of waste presents as favorable. Three types of waste with different characteristics and origins have proved attractive and advantageous for many developing countries. They are incinerated municipal soli...

  14. Evolutionary computation techniques a comparative perspective

    CERN Document Server

    Cuevas, Erik; Oliva, Diego

    2017-01-01

    This book compares the performance of various evolutionary computation (EC) techniques when they are faced with complex optimization problems extracted from different engineering domains. Particularly focusing on recently developed algorithms, it is designed so that each chapter can be read independently. Several comparisons among EC techniques have been reported in the literature, however, they all suffer from one limitation: their conclusions are based on the performance of popular evolutionary approaches over a set of synthetic functions with exact solutions and well-known behaviors, without considering the application context or including recent developments. In each chapter, a complex engineering optimization problem is posed, and then a particular EC technique is presented as the best choice, according to its search characteristics. Lastly, a set of experiments is conducted in order to compare its performance to other popular EC methods.

  15. Comparing coefficients of nested nonlinear probability models

    DEFF Research Database (Denmark)

    Kohler, Ulrich; Karlson, Kristian Bernt; Holm, Anders

    2011-01-01

    In a series of recent articles, Karlson, Holm and Breen have developed a method for comparing the estimated coeffcients of two nested nonlinear probability models. This article describes this method and the user-written program khb that implements the method. The KHB-method is a general decomposi......In a series of recent articles, Karlson, Holm and Breen have developed a method for comparing the estimated coeffcients of two nested nonlinear probability models. This article describes this method and the user-written program khb that implements the method. The KHB-method is a general...... decomposition method that is unaffected by the rescaling or attenuation bias that arise in cross-model comparisons in nonlinear models. It recovers the degree to which a control variable, Z, mediates or explains the relationship between X and a latent outcome variable, Y*, underlying the nonlinear probability...

  16. Comparing Two Approaches for Engineering Education Development

    DEFF Research Database (Denmark)

    Edström, Kristina; Kolmos, Anette

    2012-01-01

    During the last decade there have been two dominating models for reforming engineering education: Problem/Project Based Learning (PBL) and the CDIO Initiative. The aim of this paper is to compare the PBL and CDIO approaches to engineering education reform, to identify and explain similarities...... and differences. CDIO and PBL will each be defined and compared in terms of the original need analysis, underlying educational philosophy and the essentials of the respective approaches to engineering education. In these respects we see many similarities. Circumstances that explain differences in history...... approaches have much in common and can be combined, and especially that the practitioners have much to learn from each other’s experiences through a dialogue between the communities. This structured comparison will potentially indicate specifically what an institution experienced in one of the communities...

  17. Comparative risk assessment of total energy systems

    International Nuclear Information System (INIS)

    Soerensen, B.

    1982-01-01

    The paper discusses a methodology for total impact assessment of energy systems, ideally evaluating all the impacts that a given energy system has on the society in which it is imbedded or into which its introduction is being considered. Impacts from the entire energy conversion chain ('fuel cycle' if the system is fuel-based), including energy storage, transport and transmission, as well as the institutions formed in order to manage the system, should be compared on the basis of the energy service provided. A number of impacts are considered, broadly classified as impacts on satisfaction of biological needs, on health, on environment, on social relations and on the structure of society. Further considerations include impacts related to cost and resilience, and, last but not least, impacts on global relations. The paper discusses a number of published energy studies in the light of the comparative impact assessment methodology outlined above. (author)

  18. Comparing Android Applications to Find Copying

    Directory of Open Access Journals (Sweden)

    Larry Melling

    2012-03-01

    Full Text Available The Android smartphone operating system includes a Java mobile development platform that provides for rapid development and deployment of a wide variety of applications. The open nature of the platform means that reverse engineering of applications is relatively easy, and many developers are concerned as applications similar to their own show up in the Android marketplace and want to know if these applications are pirated. Fortunately, the same characteristics that make an Android application easy to reverse engineer and copy also provide opportunities for Android developers to compare downloaded applications to their own. This paper describes the process for comparing a developer’s application with a downloaded application and defines an identifiability metric to quantify the degree to which an application can be identified by its bytecode.

  19. Diagnosing MOV problems using comparative trace analysis

    International Nuclear Information System (INIS)

    Leon, R.L.

    1992-01-01

    The paper presents the concept of comparative trace analysis and shows it to be very effective in diagnosing motor operated valve (MOV) problems. Comparative trace analysis is simply the process of interpreting simultaneously gathered traces, each presenting a different perspective on the same series of events. The opening and closing of a motor operated valve is such a series of events. The simultaneous traces are obtained using Liberty Technologies' Valve Operation Test and Evaluation System (VOTES)reg-sign. The traces include stem thrust, motor current, motor power factor, motor power, switch actuations, vibration in three different frequency bands, spring pack displacement, and spring pack force. Spare and auxiliary channels enable additional key parameters to be measured, such as differential pressure and stem displacement. Though not specifically illustrated in this paper, the VOTES system also provides for FFT analysis on all traces except switches

  20. Comparing greenhouse gases for policy purposes

    International Nuclear Information System (INIS)

    Schmalensee, R.

    1993-01-01

    In order to derive optimal policies for greenhouse gas emissions control, the discounted marginal damages of emissions from different gases must be compared. The greenhouse warming potential (GWP) index, which is most often used to compare greenhouse gases, is not based on such a damage comparison. This essay presents assumptions under which ratios of gas-specific discounted marginal damages reduce to ratios of discounted marginal contributions to radiative forcing, where the discount rate is the difference between the discount rate relevant to climate-related damages and the rate of growth of marginal climate-related damages over time. If there are important gas-specific costs or benefits not tied to radiative forcing, however, such as direct effects of carbon dioxide on plant growth, there is in general no shortcut around explicit comparison of discounted net marginal damages. 16 refs

  1. Comparative Study of Bancruptcy Prediction Models

    Directory of Open Access Journals (Sweden)

    Isye Arieshanti

    2013-09-01

    Full Text Available Early indication of bancruptcy is important for a company. If companies aware of  potency of their bancruptcy, they can take a preventive action to anticipate the bancruptcy. In order to detect the potency of a bancruptcy, a company can utilize a a model of bancruptcy prediction. The prediction model can be built using a machine learning methods. However, the choice of machine learning methods should be performed carefully. Because the suitability of a model depends on the problem specifically. Therefore, in this paper we perform a comparative study of several machine leaning methods for bancruptcy prediction. According to the comparative study, the performance of several models that based on machine learning methods (k-NN, fuzzy k-NN, SVM, Bagging Nearest Neighbour SVM, Multilayer Perceptron(MLP, Hybrid of MLP + Multiple Linear Regression, it can be showed that fuzzy k-NN method achieve the best performance with accuracy 77.5%

  2. Comparing teacher roles in Denmark and England

    DEFF Research Database (Denmark)

    Kelly, Peter; Dorf, Hans; Pratt, Nick

    2014-01-01

    This article reports the findings of a comparative study of teaching in Denmark and England. Its broader aim is to help develop an approach for comparing pedagogy. Lesson observations and interviews identified the range of goals towards which teachers in each country worked and the actions...... these prompted. These were clustered using the lens of Bernstein’s pedagogic discourse to construct teacher roles, which provided a view of pedagogy. Through this approach we have begun to identify variations in pedagogy across two countries. All teachers in this study adopted a variety of roles. Of significance...... was the ease with which competent English teachers moved between roles. The English teachers observed adopted roles consistent with a wider techno-rationalist discourse. There was a greater subject emphasis by Danish teachers, whose work was set predominantly within a democratic humanist discourse, whilst...

  3. Gramene database: Navigating plant comparative genomics resources

    Directory of Open Access Journals (Sweden)

    Parul Gupta

    2016-11-01

    Full Text Available Gramene (http://www.gramene.org is an online, open source, curated resource for plant comparative genomics and pathway analysis designed to support researchers working in plant genomics, breeding, evolutionary biology, system biology, and metabolic engineering. It exploits phylogenetic relationships to enrich the annotation of genomic data and provides tools to perform powerful comparative analyses across a wide spectrum of plant species. It consists of an integrated portal for querying, visualizing and analyzing data for 44 plant reference genomes, genetic variation data sets for 12 species, expression data for 16 species, curated rice pathways and orthology-based pathway projections for 66 plant species including various crops. Here we briefly describe the functions and uses of the Gramene database.

  4. A Comparative Perspective on Reactor Decommissioning

    International Nuclear Information System (INIS)

    Devgun, J.S.; Zelmer, R.

    2006-01-01

    A comparative perspective on decommissioning, based on facts and figures as well as the national policies, is useful in identifying mutually beneficial 'lessons learned' from various decommissioning programs. In this paper we provide such a perspective on the US and European approaches based on a review of the programmatic experience and the decommissioning projects. The European countries selected for comparison, UK, France, and Germany, have nuclear power programs comparable in size and vintage to the US program but have distinctly different policies at the federal level. The national decommissioning scene has a lot to do with how national nuclear energy policies are shaped. Substantial experience exists in all decommissioning programs and the technology is in a mature state. Substantial cost savings can result from sharing of decommissioning information, technologies and approaches among various programs. However, the Achilles' heel for the decommissioning industry remains the lack of appropriate disposal facilities for the nuclear wastes. (authors)

  5. General practitioners and energy healers compared

    DEFF Research Database (Denmark)

    Ostenfeld-Rosenthal, Ann

    Purpose The purpose of the research project was to compare MUS patients’ experience of respectively GP consultation rituals and spiritual healing rituals. Background Medically unexplained symptoms (MUS) are defined as: physical symptoms for which no adequate physiological basis can be found. Cons...... paradigm constitutes an obstacle for the GP to offer the MUS patients the best treatment and support. The paper concludes with some reflections on what constitutes ‘the good healer’....

  6. Comparing Development Trajectories in India and China

    DEFF Research Database (Denmark)

    Schmidt, Johannes Dragsbæk

    This presentation intends to explore why the two development models in India and China differ fundamentally but also why they share a number of similarities. The aim is to entangle the internal dynamics and mutual relations between the two countries by utilizing a critical comparative political...... economy framework as the theoretical point of departure. The focus is whether regime form per se impacts development outcomes ie whether democracy vs authoritarianism impedes or promotes wealth creation, social order and inequality....

  7. COMPARATIVE FINANCIAL STATEMENTS. CONVERGENCE VERSUS DIVERGENCE

    Directory of Open Access Journals (Sweden)

    Nicolae ECOBICI

    2010-09-01

    Full Text Available In this paper I compared the Romanian financial statements with the US GAAP financial statements in terms of two criteria: first the reference period and secondly the shape, structure and content of financial statements. Nowadays the two accounting systems, the French and Anglo-Saxon, tend to harmonize. I will present the convergences and the divergences between the financial statements of Romania, subject to OMFP 3055/2009, in parallel with the Anglo-Saxon accounting system.

  8. Comparing numerically exact and modelled static friction

    Directory of Open Access Journals (Sweden)

    Krengel Dominik

    2017-01-01

    Full Text Available Currently there exists no mechanically consistent “numerically exact” implementation of static and dynamic Coulomb friction for general soft particle simulations with arbitrary contact situations in two or three dimension, but only along one dimension. We outline a differential-algebraic equation approach for a “numerically exact” computation of friction in two dimensions and compare its application to the Cundall-Strack model in some test cases.

  9. AMERICAN EDUCATION SYSTEM: A COMPARATIVE STUDY

    OpenAIRE

    BAS, Gökhan

    2016-01-01

    The purpose of this study was to introduce the Education System of the United States of America (USA) and to compare it with the Turkish Education System. The Education System of the United States of America was held from different factors (e.g., education structure, curriculum and instruction, principal selection, educational supervision, special education ,teacher education, finance for education, international examinations, vs.) and these factors were explained under headlines in the study...

  10. Technique for comparing automatic quadrature routines

    Energy Technology Data Exchange (ETDEWEB)

    Lyness, J N; Kaganove, J J

    1976-02-01

    The present unconstrained proliferation of automatic quadrature routines is a phenomenon which is wasteful in human time and computing resources. At the root of the problem is an absence of generally acceptable standards or benchmarks for comparing or evaluating such routines. In this paper a general technique, based on the nature of the performance profile, is described which can be used for evaluation of routines.

  11. Comparative Analysis of Terrorists’ Communication Strategies

    Directory of Open Access Journals (Sweden)

    Denis Alexandrovich Zhuravliev

    2011-01-01

    Full Text Available There is a wide-spread approach in a research literature to regard terrorism as a communicative process. From this point of view, the author offers a comparative analysis of the three most common communication strategies of terrorist groups, including transforming the role of the mass media, the Internet and a combined approach. The author also argues that a particular communication strategy determines a structure of a terrorist organization.

  12. Finance, Comparative Advantage, and Resource Allocation

    OpenAIRE

    Jaud, Melise; Kukenova, Madina; Strieborny, Martin

    2013-01-01

    The authors show that exported products exit the US market sooner if they violate the Heckscher-Ohlin notion of comparative advantage. Crucially, this pattern is stronger when exporting country has a well-developed banking system, measured by a high ratio of bank credit over the GDP. Banks thus push firms away from exports that are facing an uphill battle on a competitive foreign market du...

  13. Business Sustainability: How Does Tourism Compare?

    OpenAIRE

    Char-lee Moyle; Brent Moyle; Lisa Ruhanen; Alexandra Bec; Betty Weiler

    2018-01-01

    This study aims to empirically compare the adoption of business sustainability amongst 291 randomly-selected tourism and non-tourism businesses in New South Wales, Australia. Tourism businesses were found to be more committed to environmentally-sustainable practices than other types of businesses with there being a clear correlation with their ability to learn and adapt. This contradicts criticisms in the literature that tourism businesses are slow adopters of sustainability. This study highl...

  14. Comparing two Poisson populations sequentially: an application

    International Nuclear Information System (INIS)

    Halteman, E.J.

    1986-01-01

    Rocky Flats Plant in Golden, Colorado monitors each of its employees for radiation exposure. Excess exposure is detected by comparing the means of two Poisson populations. A sequential probability ratio test (SPRT) is proposed as a replacement for the fixed sample normal approximation test. A uniformly most efficient SPRT exists, however logistics suggest using a truncated SPRT. The truncated SPRT is evaluated in detail and shown to possess large potential savings in average time spent by employees in the monitoring process

  15. Comparing nuclear power with other energy sources

    International Nuclear Information System (INIS)

    Rey, Francisco C.

    2001-01-01

    The economics of electric generation of nuclear, hydro, oil and gas origin are compared. A similar comparison is also made from the health and environment standpoint for the fossil, nuclear, solar and wind generation. A risk assessment for energies of different origin is outlined and the significance of the greenhouse effect is emphasised. A comprehensive economic and environmental evaluation is recommended for the energy planning

  16. Preliminary Competencies for Comparative Effectiveness Research

    OpenAIRE

    Segal, Jodi B.; Kapoor, Wishwa; Carey, Timothy; Mitchell, Pamela H.; Murray, Michael D.; Saag, Kenneth G.; Schumock, Glen; Jonas, Daniel; Steinman, Michael; Weinberger, Morris; Filart, Rosemarie; Selker, Harry

    2012-01-01

    The Clinical and Translational Science Award (CTSA) Workgroup for Comparative Effectiveness Research (CER) Education, Training, and Workforce Development identified a need to delineate the competencies that practitioners and users of CER for patient centered outcomes research, should acquire. With input from CTSA representatives and collaborators, we began by describing the workforce. We recognize the workforce that conduct CER and the end users who use CER to improve the health of individual...

  17. Comparative effectiveness research: Challenges for medical journals

    Directory of Open Access Journals (Sweden)

    Tovey David

    2010-04-01

    Full Text Available Abstract Editors from a number of medical journals lay out principles for journals considering publication of Comparative Effectiveness Research (CER. In order to encourage dissemination of this editorial, this article is freely available in PLoS Medicine and will be also published in Medical Decision Making, Croatian Medical Journal, The Cochrane Library, Trials, The American Journal of Managed Care, and Journal of Clinical Epidemiology.

  18. Comparative genomics of chondrichthyan Hoxa clusters

    Directory of Open Access Journals (Sweden)

    Zhong Ying-Fu

    2009-09-01

    Full Text Available Abstract Background The chondrichthyan or cartilaginous fish (chimeras, sharks, skates and rays occupy an important phylogenetic position as the sister group to all other jawed vertebrates and as an early lineage to diverge from the vertebrate lineage following two whole genome duplication events in vertebrate evolution. There have been few comparative genomic analyses incorporating data from chondrichthyan fish and none comparing genomic information from within the group. We have sequenced the complete Hoxa cluster of the Little Skate (Leucoraja erinacea and compared to the published Hoxa cluster of the Horn Shark (Heterodontus francisci and to available data from the Elephant Shark (Callorhinchus milii genome project. Results A BAC clone containing the full Little Skate Hoxa cluster was fully sequenced and assembled. Analyses of coding sequences and conserved non-coding elements reveal a strikingly high level of conservation across the cartilaginous fish, with twenty ultraconserved elements (100%,100 bp found between Skate and Horn Shark, compared to three between human and marsupials. We have also identified novel potential non-coding RNAs in the Skate BAC clone, some of which are conserved to other species. Conclusion We find that the Little Skate Hoxa cluster is remarkably similar to the previously published Horn Shark Hoxa cluster with respect to sequence identity, gene size and intergenic distance despite over 180 million years of separation between the two lineages. We suggest that the genomes of cartilaginous fish are more highly conserved than those of tetrapods or teleost fish and so are more likely to have retained ancestral non-coding elements. While useful for isolating homologous DNA, this complicates bioinformatic approaches to identify chondrichthyan-specific non-coding DNA elements

  19. Comparative spring mechanics in mantis shrimp.

    Science.gov (United States)

    Patek, S N; Rosario, M V; Taylor, J R A

    2013-04-01

    Elastic mechanisms are fundamental to fast and efficient movements. Mantis shrimp power their fast raptorial appendages using a conserved network of exoskeletal springs, linkages and latches. Their appendages are fantastically diverse, ranging from spears to hammers. We measured the spring mechanics of 12 mantis shrimp species from five different families exhibiting hammer-shaped, spear-shaped and undifferentiated appendages. Across species, spring force and work increase with size of the appendage and spring constant is not correlated with size. Species that hammer their prey exhibit significantly greater spring resilience compared with species that impale evasive prey ('spearers'); mixed statistical results show that species that hammer prey also produce greater work relative to size during spring loading compared with spearers. Disabling part of the spring mechanism, the 'saddle', significantly decreases spring force and work in three smasher species; cross-species analyses show a greater effect of cutting the saddle on the spring force and spring constant in species without hammers compared with species with hammers. Overall, the study shows a more potent spring mechanism in the faster and more powerful hammering species compared with spearing species while also highlighting the challenges of reconciling within-species and cross-species mechanical analyses when different processes may be acting at these two different levels of analysis. The observed mechanical variation in spring mechanics provides insights into the evolutionary history, morphological components and mechanical behavior, which were not discernible in prior single-species studies. The results also suggest that, even with a conserved spring mechanism, spring behavior, potency and component structures can be varied within a clade with implications for the behavioral functions of power-amplified devices.

  20. Comparative properties of feline coronaviruses in vitro.

    OpenAIRE

    McKeirnan, A J; Evermann, J F; Davis, E V; Ott, R L

    1987-01-01

    Two feline coronaviruses were characterized to determine their biological properties in vitro and their antigenic relatedness to a previously recognized feline infectious peritonitis virus and canine coronavirus. The viruses, designated WSU 79-1146 and WSU 79-1683, were shown to have comparable growth curves with the prototype feline infectious peritonitis virus. Treatment of the feline infectious peritonitis virus strains with 0.25% trypsin indicated that they were relatively resistant to pr...

  1. Efficient Frontier - Comparing Different Volatility Estimators

    OpenAIRE

    Tea Poklepović; Zdravka Aljinović; Mario Matković

    2015-01-01

    Modern Portfolio Theory (MPT) according to Markowitz states that investors form mean-variance efficient portfolios which maximizes their utility. Markowitz proposed the standard deviation as a simple measure for portfolio risk and the lower semi-variance as the only risk measure of interest to rational investors. This paper uses a third volatility estimator based on intraday data and compares three efficient frontiers on the Croatian Stock Market. The results show that ra...

  2. COMPARATIVE ANALYSIS OF SOFTWARE DEVELOPMENT MODELS

    OpenAIRE

    Sandeep Kaur*

    2017-01-01

    No geek is unfamiliar with the concept of software development life cycle (SDLC). This research deals with the various SDLC models covering waterfall, spiral, and iterative, agile, V-shaped, prototype model. In the modern era, all the software systems are fallible as they can’t stand with certainty. So, it is tried to compare all aspects of the various models, their pros and cons so that it could be easy to choose a particular model at the time of need

  3. Neutron activation analysis-comparative (NAAC)

    International Nuclear Information System (INIS)

    Zimmer, W.H.

    1979-01-01

    A software system for the reduction of comparative neutron activation analysis data is presented. Libraries are constructed to contain the elemental composition and isotopic nuclear data of an unlimited number of standards. Ratios to unknown sample data are performed by standard calibrations. Interfering peak corrections, second-order activation-product corrections, and deconvolution of multiplets are applied automatically. Passive gamma-energy analysis can be performed with the same software. 3 figures

  4. Robust canonical correlations: A comparative study

    OpenAIRE

    Branco, JA; Croux, Christophe; Filzmoser, P; Oliveira, MR

    2005-01-01

    Several approaches for robust canonical correlation analysis will be presented and discussed. A first method is based on the definition of canonical correlation analysis as looking for linear combinations of two sets of variables having maximal (robust) correlation. A second method is based on alternating robust regressions. These methods axe discussed in detail and compared with the more traditional approach to robust canonical correlation via covariance matrix estimates. A simulation study ...

  5. Comparative Neuropharmacological Activities Methanolic Extracts of ...

    African Journals Online (AJOL)

    Comparative neuropharmacological efficacy of the leaf and root 70 % methanol extract of Cissus cornifolia was studied in mice. The extractive values of the leaf and root methanol extract was found to be 31.5 g with yield of 12.6 %(w/w) and 37.8 g with the yield of 15.12 %(w/w) respectively. The acute toxicity (LD50) values ...

  6. Microstructure of a tribosphenic molar - comparative analysis

    OpenAIRE

    ŠPOUTIL, František

    2010-01-01

    The proposed thesis concerns in the study of tribosphenic molar, the key apomorphy of mammalian clade, mainly in structure and development of its enamel coat. As the main model species served us European vespertilionid bat Myotis myotis. The aims of this thesis are: (1) to describe structure and microstructure of enamel in tribosphenic molars in detail; (2) to compare it with unicuspid teeth of the same dentition; (3) to describe mineralization process and enamel maturation in insectivorous d...

  7. Hans Strahl's pioneering studies in comparative placentation

    DEFF Research Database (Denmark)

    Carter, Anthony Michael; Mess, A

    2010-01-01

    Hans Strahl, a contemporary of Duval and Hubrecht, made many important contributions to comparative placentation. Despite this he is not well known and some of his original observations tend to be attributed to later authors. Strahl published a classification of placental types based on their shape...... of the most important findings made by Strahl including work on placentation in carnivores and higher primates that remains unsurpassed....

  8. Comparative Study on Water Impact Problem

    OpenAIRE

    Yang, Liang; Yang, Hao; Yan, Shiqiang; Ma, Qingwei; Bihnam, Maria

    2016-01-01

    This paper presents a comparative numerical study for the water impact problems due to dropping of triangular wedges or ship sections. In the numerical investigation, both the dynamic mesh technique and immersed boundary method adopting fixed Cartesian grids have been adopted in order to conform to the motion of the structure. For the former, a multiple-phase solver with the volume of fluid for identifying the free surface is implemented. In the simulation using this method, both the compress...

  9. Comparative efficiency of trickle and furrow irrigation

    International Nuclear Information System (INIS)

    Hanif, M.; Qureshi, R.H.; Sandhu, G.R.

    1976-01-01

    Comparison of furrow and trickle methods of irrigation to know their relative efficiency with respect to water applied and fertilizer used on tomatoes, cauliflower and lettuce as test crops using canal water, showed a significant saving of about 44 and 41 per cent respectively for irrigation water and fertilizer applied with trickle as compared to furrow irrigation. Trickle irrigated crops also showed a better response as regards the rate of survival, crop growth and time of maturity

  10. VISTA - computational tools for comparative genomics

    Energy Technology Data Exchange (ETDEWEB)

    Frazer, Kelly A.; Pachter, Lior; Poliakov, Alexander; Rubin,Edward M.; Dubchak, Inna

    2004-01-01

    Comparison of DNA sequences from different species is a fundamental method for identifying functional elements in genomes. Here we describe the VISTA family of tools created to assist biologists in carrying out this task. Our first VISTA server at http://www-gsd.lbl.gov/VISTA/ was launched in the summer of 2000 and was designed to align long genomic sequences and visualize these alignments with associated functional annotations. Currently the VISTA site includes multiple comparative genomics tools and provides users with rich capabilities to browse pre-computed whole-genome alignments of large vertebrate genomes and other groups of organisms with VISTA Browser, submit their own sequences of interest to several VISTA servers for various types of comparative analysis, and obtain detailed comparative analysis results for a set of cardiovascular genes. We illustrate capabilities of the VISTA site by the analysis of a 180 kilobase (kb) interval on human chromosome 5 that encodes for the kinesin family member3A (KIF3A) protein.

  11. Modularity, comparative cognition and human uniqueness.

    Science.gov (United States)

    Shettleworth, Sara J

    2012-10-05

    Darwin's claim 'that the difference in mind between man and the higher animals … is certainly one of degree and not of kind' is at the core of the comparative study of cognition. Recent research provides unprecedented support for Darwin's claim as well as new reasons to question it, stimulating new theories of human cognitive uniqueness. This article compares and evaluates approaches to such theories. Some prominent theories propose sweeping domain-general characterizations of the difference in cognitive capabilities and/or mechanisms between adult humans and other animals. Dual-process theories for some cognitive domains propose that adult human cognition shares simple basic processes with that of other animals while additionally including slower-developing and more explicit uniquely human processes. These theories are consistent with a modular account of cognition and the 'core knowledge' account of children's cognitive development. A complementary proposal is that human infants have unique social and/or cognitive adaptations for uniquely human learning. A view of human cognitive architecture as a mosaic of unique and species-general modular and domain-general processes together with a focus on uniquely human developmental mechanisms is consistent with modern evolutionary-developmental biology and suggests new questions for comparative research.

  12. Comparing biological networks via graph compression

    Directory of Open Access Journals (Sweden)

    Hayashida Morihiro

    2010-09-01

    Full Text Available Abstract Background Comparison of various kinds of biological data is one of the main problems in bioinformatics and systems biology. Data compression methods have been applied to comparison of large sequence data and protein structure data. Since it is still difficult to compare global structures of large biological networks, it is reasonable to try to apply data compression methods to comparison of biological networks. In existing compression methods, the uniqueness of compression results is not guaranteed because there is some ambiguity in selection of overlapping edges. Results This paper proposes novel efficient methods, CompressEdge and CompressVertices, for comparing large biological networks. In the proposed methods, an original network structure is compressed by iteratively contracting identical edges and sets of connected edges. Then, the similarity of two networks is measured by a compression ratio of the concatenated networks. The proposed methods are applied to comparison of metabolic networks of several organisms, H. sapiens, M. musculus, A. thaliana, D. melanogaster, C. elegans, E. coli, S. cerevisiae, and B. subtilis, and are compared with an existing method. These results suggest that our methods can efficiently measure the similarities between metabolic networks. Conclusions Our proposed algorithms, which compress node-labeled networks, are useful for measuring the similarity of large biological networks.

  13. Genome-Wide Comparative Gene Family Classification

    Science.gov (United States)

    Frech, Christian; Chen, Nansheng

    2010-01-01

    Correct classification of genes into gene families is important for understanding gene function and evolution. Although gene families of many species have been resolved both computationally and experimentally with high accuracy, gene family classification in most newly sequenced genomes has not been done with the same high standard. This project has been designed to develop a strategy to effectively and accurately classify gene families across genomes. We first examine and compare the performance of computer programs developed for automated gene family classification. We demonstrate that some programs, including the hierarchical average-linkage clustering algorithm MC-UPGMA and the popular Markov clustering algorithm TRIBE-MCL, can reconstruct manual curation of gene families accurately. However, their performance is highly sensitive to parameter setting, i.e. different gene families require different program parameters for correct resolution. To circumvent the problem of parameterization, we have developed a comparative strategy for gene family classification. This strategy takes advantage of existing curated gene families of reference species to find suitable parameters for classifying genes in related genomes. To demonstrate the effectiveness of this novel strategy, we use TRIBE-MCL to classify chemosensory and ABC transporter gene families in C. elegans and its four sister species. We conclude that fully automated programs can establish biologically accurate gene families if parameterized accordingly. Comparative gene family classification finds optimal parameters automatically, thus allowing rapid insights into gene families of newly sequenced species. PMID:20976221

  14. Comparative study of some new EPR dosimeters

    International Nuclear Information System (INIS)

    Alzimami, K.S.; Maghraby, Ahmed M.; Bradley, D.A.

    2014-01-01

    Investigations have been made of four new radiation dosimetry EPR candidates from the same family of materials: sulfamic acid, sulfanillic acid, homotaurine, and taurine. Mass energy attenuation coefficients, mass stopping power values and the time dependence of the radiation induced radicals are compared. Also investigated are the microwave saturation behavior and the effect of applied modulation amplitude on both peak-to-peak line width (W PP ) and peak-to-peak signal height (H PP ). The dosimeters are characterized by simple spectra and stable radiation-induced radicals over reasonable durations, especially in taurine dosimeters. Sulfamic acid dosimeters possessed the highest sensitivity followed by taurine and homotaurine and sulfanillic. - Highlights: ► Several EPR dosimeters were suggested based on SO 3 − radical. ► Taurine, homotaurine, sulfanilic, and sulfamic acid all possess simple EPR spectra. ► Dosimeters were compared to each other in terms of the dosimetric point of view. ► Energy dependence curves of the selected dosimeters were compared to eachother

  15. Embedded Hyperchaotic Generators: A Comparative Analysis

    Science.gov (United States)

    Sadoudi, Said; Tanougast, Camel; Azzaz, Mohamad Salah; Dandache, Abbas

    In this paper, we present a comparative analysis of FPGA implementation performances, in terms of throughput and resources cost, of five well known autonomous continuous hyperchaotic systems. The goal of this analysis is to identify the embedded hyperchaotic generator which leads to designs with small logic area cost, satisfactory throughput rates, low power consumption and low latency required for embedded applications such as secure digital communications between embedded systems. To implement the four-dimensional (4D) chaotic systems, we use a new structural hardware architecture based on direct VHDL description of the forth order Runge-Kutta method (RK-4). The comparative analysis shows that the hyperchaotic Lorenz generator provides attractive performances compared to that of others. In fact, its hardware implementation requires only 2067 CLB-slices, 36 multipliers and no block RAMs, and achieves a throughput rate of 101.6 Mbps, at the output of the FPGA circuit, at a clock frequency of 25.315 MHz with a low latency time of 316 ns. Consequently, these good implementation performances offer to the embedded hyperchaotic Lorenz generator the advantage of being the best candidate for embedded communications applications.

  16. Metrics for comparing dynamic earthquake rupture simulations

    Science.gov (United States)

    Barall, Michael; Harris, Ruth A.

    2014-01-01

    Earthquakes are complex events that involve a myriad of interactions among multiple geologic features and processes. One of the tools that is available to assist with their study is computer simulation, particularly dynamic rupture simulation. A dynamic rupture simulation is a numerical model of the physical processes that occur during an earthquake. Starting with the fault geometry, friction constitutive law, initial stress conditions, and assumptions about the condition and response of the near‐fault rocks, a dynamic earthquake rupture simulation calculates the evolution of fault slip and stress over time as part of the elastodynamic numerical solution (Ⓔ see the simulation description in the electronic supplement to this article). The complexity of the computations in a dynamic rupture simulation make it challenging to verify that the computer code is operating as intended, because there are no exact analytic solutions against which these codes’ results can be directly compared. One approach for checking if dynamic rupture computer codes are working satisfactorily is to compare each code’s results with the results of other dynamic rupture codes running the same earthquake simulation benchmark. To perform such a comparison consistently, it is necessary to have quantitative metrics. In this paper, we present a new method for quantitatively comparing the results of dynamic earthquake rupture computer simulation codes.

  17. Comparative Reannotation of 21 Aspergillus Genomes

    Energy Technology Data Exchange (ETDEWEB)

    Salamov, Asaf; Riley, Robert; Kuo, Alan; Grigoriev, Igor

    2013-03-08

    We used comparative gene modeling to reannotate 21 Aspergillus genomes. Initial automatic annotation of individual genomes may contain some errors of different nature, e.g. missing genes, incorrect exon-intron structures, 'chimeras', which fuse 2 or more real genes or alternatively splitting some real genes into 2 or more models. The main premise behind the comparative modeling approach is that for closely related genomes most orthologous families have the same conserved gene structure. The algorithm maps all gene models predicted in each individual Aspergillus genome to the other genomes and, for each locus, selects from potentially many competing models, the one which most closely resembles the orthologous genes from other genomes. This procedure is iterated until no further change in gene models is observed. For Aspergillus genomes we predicted in total 4503 new gene models ( ~;;2percent per genome), supported by comparative analysis, additionally correcting ~;;18percent of old gene models. This resulted in a total of 4065 more genes with annotated PFAM domains (~;;3percent increase per genome). Analysis of a few genomes with EST/transcriptomics data shows that the new annotation sets also have a higher number of EST-supported splice sites at exon-intron boundaries.

  18. Methods for the comparative evaluation of pharmaceuticals

    Directory of Open Access Journals (Sweden)

    Busse, Reinhard

    2005-11-01

    Full Text Available Political background: As a German novelty, the Institute for Quality and Efficiency in Health Care (Institut für Qualität und Wirtschaftlichkeit im Gesundheitswesen; IGWiG was established in 2004 to, among other tasks, evaluate the benefit of pharmaceuticals. In this context it is of importance that patented pharmaceuticals are only excluded from the reference pricing system if they offer a therapeutic improvement. The institute is commissioned by the Federal Joint Committee (Gemeinsamer Bundesausschuss, G-BA or by the Ministry of Health and Social Security. The German policy objective expressed by the latest health care reform (Gesetz zur Modernisierung der Gesetzlichen Krankenversicherung, GMG is to base decisions on a scientific assessment of pharmaceuticals in comparison to already available treatments. However, procedures and methods are still to be established. Research questions and methods: This health technology assessment (HTA report was commissioned by the German Agency for HTA at the Institute for Medical Documentation and Information (DAHTA@DIMDI. It analysed criteria, procedures, and methods of comparative drug assessment in other EU-/OECD-countries. The research question was the following: How do national public institutions compare medicines in connection with pharmaceutical regulation, i.e. licensing, reimbursement and pricing of drugs? Institutions as well as documents concerning comparative drug evaluation (e.g. regulations, guidelines were identified through internet, systematic literature, and hand searches. Publications were selected according to pre-defined inclusion and exclusion criteria. Documents were analysed in a qualitative matter following an analytic framework that had been developed in advance. Results were summarised narratively and presented in evidence tables. Results and discussion: Currently licensing agencies do not systematically assess a new drug's added value for patients and society. This is why many

  19. Methods for the comparative evaluation of pharmaceuticals.

    Science.gov (United States)

    Zentner, Annette; Velasco-Garrido, Marcial; Busse, Reinhard

    2005-11-15

    POLITICAL BACKGROUND: As a German novelty, the Institute for Quality and Efficiency in Health Care (Institut für Qualität und Wirtschaftlichkeit im Gesundheitswesen; IGWiG) was established in 2004 to, among other tasks, evaluate the benefit of pharmaceuticals. In this context it is of importance that patented pharmaceuticals are only excluded from the reference pricing system if they offer a therapeutic improvement. The institute is commissioned by the Federal Joint Committee (Gemeinsamer Bundesausschuss, G-BA) or by the Ministry of Health and Social Security. The German policy objective expressed by the latest health care reform (Gesetz zur Modernisierung der Gesetzlichen Krankenversicherung, GMG) is to base decisions on a scientific assessment of pharmaceuticals in comparison to already available treatments. However, procedures and methods are still to be established. This health technology assessment (HTA) report was commissioned by the German Agency for HTA at the Institute for Medical Documentation and Information (DAHTA@DIMDI). It analysed criteria, procedures, and methods of comparative drug assessment in other EU-/OECD-countries. The research question was the following: How do national public institutions compare medicines in connection with pharmaceutical regulation, i.e. licensing, reimbursement and pricing of drugs? Institutions as well as documents concerning comparative drug evaluation (e.g. regulations, guidelines) were identified through internet, systematic literature, and hand searches. Publications were selected according to pre-defined inclusion and exclusion criteria. Documents were analysed in a qualitative matter following an analytic framework that had been developed in advance. Results were summarised narratively and presented in evidence tables. Currently licensing agencies do not systematically assess a new drug's added value for patients and society. This is why many countries made post-licensing evaluation of pharmaceuticals a

  20. CloVR-Comparative: automated, cloud-enabled comparative microbial genome sequence analysis pipeline

    OpenAIRE

    Agrawal, Sonia; Arze, Cesar; Adkins, Ricky S.; Crabtree, Jonathan; Riley, David; Vangala, Mahesh; Galens, Kevin; Fraser, Claire M.; Tettelin, Herv?; White, Owen; Angiuoli, Samuel V.; Mahurkar, Anup; Fricke, W. Florian

    2017-01-01

    Background The benefit of increasing genomic sequence data to the scientific community depends on easy-to-use, scalable bioinformatics support. CloVR-Comparative combines commonly used bioinformatics tools into an intuitive, automated, and cloud-enabled analysis pipeline for comparative microbial genomics. Results CloVR-Comparative runs on annotated complete or draft genome sequences that are uploaded by the user or selected via a taxonomic tree-based user interface and downloaded from NCBI. ...

  1. Risk indices in comparative risk assessment studies

    International Nuclear Information System (INIS)

    Hubert, P.

    1984-01-01

    More than a decade ago the development of comparative risk assessment studies aroused overwhelming interest. There was no doubt that data on the health and safety aspects of energy systems would greatly benefit, or even end, the debate on nuclear energy. Although such attempts are still strongly supported, the rose-coloured expectations of the early days have faded. The high uncertainties, and the contradictory aspect, of the first results might explain this evolution. The loose connection between the range of computed risk indices and the questions on which the debate was focused is another reason for this decline in interest. Important research work is being carried out aiming at reducing the different kinds of uncertainties. Rather than the uncertainties, the paper considers the meaning of available risk indices and proposes more significant indices with respect to the goals of risk assessment. First, the indices which are of frequent use in comparative studies are listed. The stress is put on a French comparative study from which most examples are drawn. Secondly, the increase in magnitude of the indices and the decrease in the attributability of the risk to a given system is shown to be a consequence of the trend towards more comprehensive analyses. Thirdly, the ambiguity of such indices as the collective occupational risk is underlined, and a possible solution is suggested. Whenever risk assessments are related to pragmatic decision making problems it is possible to find satisfactory risk indices. The development of cost-effectiveness analyses and the proposals for quantitative safety goals clearly demonstrate this point. In the field of comparison of social impacts some proposals are made, but there remain some gaps still to be filled. (author)

  2. Using tree diversity to compare phylogenetic heuristics.

    Science.gov (United States)

    Sul, Seung-Jin; Matthews, Suzanne; Williams, Tiffani L

    2009-04-29

    Evolutionary trees are family trees that represent the relationships between a group of organisms. Phylogenetic heuristics are used to search stochastically for the best-scoring trees in tree space. Given that better tree scores are believed to be better approximations of the true phylogeny, traditional evaluation techniques have used tree scores to determine the heuristics that find the best scores in the fastest time. We develop new techniques to evaluate phylogenetic heuristics based on both tree scores and topologies to compare Pauprat and Rec-I-DCM3, two popular Maximum Parsimony search algorithms. Our results show that although Pauprat and Rec-I-DCM3 find the trees with the same best scores, topologically these trees are quite different. Furthermore, the Rec-I-DCM3 trees cluster distinctly from the Pauprat trees. In addition to our heatmap visualizations of using parsimony scores and the Robinson-Foulds distance to compare best-scoring trees found by the two heuristics, we also develop entropy-based methods to show the diversity of the trees found. Overall, Pauprat identifies more diverse trees than Rec-I-DCM3. Overall, our work shows that there is value to comparing heuristics beyond the parsimony scores that they find. Pauprat is a slower heuristic than Rec-I-DCM3. However, our work shows that there is tremendous value in using Pauprat to reconstruct trees-especially since it finds identical scoring but topologically distinct trees. Hence, instead of discounting Pauprat, effort should go in improving its implementation. Ultimately, improved performance measures lead to better phylogenetic heuristics and will result in better approximations of the true evolutionary history of the organisms of interest.

  3. A comparative test of phylogenetic diversity indices.

    Science.gov (United States)

    Schweiger, Oliver; Klotz, Stefan; Durka, Walter; Kühn, Ingolf

    2008-09-01

    Traditional measures of biodiversity, such as species richness, usually treat species as being equal. As this is obviously not the case, measuring diversity in terms of features accumulated over evolutionary history provides additional value to theoretical and applied ecology. Several phylogenetic diversity indices exist, but their behaviour has not yet been tested in a comparative framework. We provide a test of ten commonly used phylogenetic diversity indices based on 40 simulated phylogenies of varying topology. We restrict our analysis to a topological fully resolved tree without information on branch lengths and species lists with presence-absence data. A total of 38,000 artificial communities varying in species richness covering 5-95% of the phylogenies were created by random resampling. The indices were evaluated based on their ability to meet a priori defined requirements. No index meets all requirements, but three indices turned out to be more suitable than others under particular conditions. Average taxonomic distinctness (AvTD) and intensive quadratic entropy (J) are calculated by averaging and are, therefore, unbiased by species richness while reflecting phylogeny per se well. However, averaging leads to the violation of set monotonicity, which requires that species extinction cannot increase the index. Total taxonomic distinctness (TTD) sums up distinctiveness values for particular species across the community. It is therefore strongly linked to species richness and reflects phylogeny per se weakly but satisfies set monotonicity. We suggest that AvTD and J are best applied to studies that compare spatially or temporally rather independent communities that potentially vary strongly in their phylogenetic composition-i.e. where set monotonicity is a more negligible issue, but independence of species richness is desired. In contrast, we suggest that TTD be used in studies that compare rather interdependent communities where changes occur more gradually by

  4. Comparative gene expression between two yeast species

    Directory of Open Access Journals (Sweden)

    Guan Yuanfang

    2013-01-01

    Full Text Available Abstract Background Comparative genomics brings insight into sequence evolution, but even more may be learned by coupling sequence analyses with experimental tests of gene function and regulation. However, the reliability of such comparisons is often limited by biased sampling of expression conditions and incomplete knowledge of gene functions across species. To address these challenges, we previously systematically generated expression profiles in Saccharomyces bayanus to maximize functional coverage as compared to an existing Saccharomyces cerevisiae data repository. Results In this paper, we take advantage of these two data repositories to compare patterns of ortholog expression in a wide variety of conditions. First, we developed a scalable metric for expression divergence that enabled us to detect a significant correlation between sequence and expression conservation on the global level, which previous smaller-scale expression studies failed to detect. Despite this global conservation trend, between-species gene expression neighborhoods were less well-conserved than within-species comparisons across different environmental perturbations, and approximately 4% of orthologs exhibited a significant change in co-expression partners. Furthermore, our analysis of matched perturbations collected in both species (such as diauxic shift and cell cycle synchrony demonstrated that approximately a quarter of orthologs exhibit condition-specific expression pattern differences. Conclusions Taken together, these analyses provide a global view of gene expression patterns between two species, both in terms of the conditions and timing of a gene's expression as well as co-expression partners. Our results provide testable hypotheses that will direct future experiments to determine how these changes may be specified in the genome.

  5. Linear pneumatic motors – a comparative study

    Directory of Open Access Journals (Sweden)

    Deaconescu Tudor

    2017-01-01

    Full Text Available The paper presents a comparative study of the performance of single-acting cylinders, diaphragm cylinders and pneumatic muscles, and offers users information that allows the selection of an optimum technical solution. Such a study was necessary, in view of the numerous papers on pneumatic muscle applications found in literature, that assert the superiority of pneumatic muscles over other pneumatic linear motors in relation to quantities like dimensions, mass, developed force or energy-to-mass ratios, however without offering concrete data.

  6. Comparing Online Algorithms for Bin Packing Problems

    DEFF Research Database (Denmark)

    Epstein, Leah; Favrholdt, Lene Monrad; Kohrt, Jens Svalgaard

    2012-01-01

    The relative worst-order ratio is a measure of the quality of online algorithms. In contrast to the competitive ratio, this measure compares two online algorithms directly instead of using an intermediate comparison with an optimal offline algorithm. In this paper, we apply the relative worst-ord......-order ratio to online algorithms for several common variants of the bin packing problem. We mainly consider pairs of algorithms that are not distinguished by the competitive ratio and show that the relative worst-order ratio prefers the intuitively better algorithm of each pair....

  7. Comparative transport studies of ''1212'' superconductors

    International Nuclear Information System (INIS)

    Gapud, Albert; Wu, Judy; Yan, Shaolin; Xie, Yi-Yuan; Kang, Byeongwon; Siegal, Michael P.; Overmyer, Donald L.

    2000-01-01

    HgBa 2 CaCu 2 O 6+δ (Hg-1212) thin films were fabricated by exchanging the TI cations in TlBa 2 CaCu 2 O 7-δ (Tl-1212) thin films with Hg cations, causing a 30-K increase in Tc. To determine how this exchange effects such a Tc increase, the irreversibility lines, temperature dependence of critical current density, and temperature dependence of Hall angle of Hg-1212 and T1-1212 thin films were measured and then compared. The results strongly suggest that the Tc shift is caused by a doubling of charge carrier density

  8. Comparative analysis of vestibular ecomorphology in birds.

    Science.gov (United States)

    Benson, Roger B J; Starmer-Jones, Ethan; Close, Roger A; Walsh, Stig A

    2017-12-01

    The bony labyrinth of vertebrates houses the semicircular canals. These sense rotational accelerations of the head and play an essential role in gaze stabilisation during locomotion. The sizes and shapes of the semicircular canals have hypothesised relationships to agility and locomotory modes in many groups, including birds, and a burgeoning palaeontological literature seeks to make ecological interpretations from the morphology of the labyrinth in extinct species. Rigorous tests of form-function relationships for the vestibular system are required to support these interpretations. We test the hypothesis that the lengths, streamlines and angles between the semicircular canals are related to body size, wing kinematics and flying style in birds. To do this, we applied geometric morphometrics and multivariate phylogenetic comparative methods to a dataset of 64 three-dimensional reconstructions of the endosseous labyrinth obtained using micro-computed tomography scanning of bird crania. A strong relationship between centroid size of the semicircular canals and body size indicates that larger birds have longer semicircular canals compared with their evolutionary relatives. Wing kinematics related to manoeuvrability (and quantified using the brachial index) explain a small additional portion of the variance in labyrinth size. We also find strong evidence for allometric shape change in the semicircular canals of birds, indicating that major aspects of the shape of the avian labyrinth are determined by spatial constraints. The avian braincase accommodates a large brain, a large eye and large semicircular canals compared with other tetrapods. Negative allometry of these structures means that the restriction of space within the braincase is intense in small birds. This may explain our observation that the angles between planes of the semicircular canals of birds deviate more strongly from orthogonality than those of mammals, and especially from agile, gliding and flying

  9. EFQPSK Versus CERN: A Comparative Study

    Science.gov (United States)

    Borah, Deva K.; Horan, Stephen

    2001-01-01

    This report presents a comparative study on Enhanced Feher's Quadrature Phase Shift Keying (EFQPSK) and Constrained Envelope Root Nyquist (CERN) techniques. These two techniques have been developed in recent times to provide high spectral and power efficiencies under nonlinear amplifier environment. The purpose of this study is to gain insights into these techniques and to help system planners and designers with an appropriate set of guidelines for using these techniques. The comparative study presented in this report relies on effective simulation models and procedures. Therefore, a significant part of this report is devoted to understanding the mathematical and simulation models of the techniques and their set-up procedures. In particular, mathematical models of EFQPSK and CERN, effects of the sampling rate in discrete time signal representation, and modeling of nonlinear amplifiers and predistorters have been considered in detail. The results of this study show that both EFQPSK and CERN signals provide spectrally efficient communications compared to filtered conventional linear modulation techniques when a nonlinear power amplifier is used. However, there are important differences. The spectral efficiency of CERN signals, with a small amount of input backoff, is significantly better than that of EFQPSK signals if the nonlinear amplifier is an ideal clipper. However, to achieve such spectral efficiencies with a practical nonlinear amplifier, CERN processing requires a predistorter which effectively translates the amplifier's characteristics close to those of an ideal clipper. Thus, the spectral performance of CERN signals strongly depends on the predistorter. EFQPSK signals, on the other hand, do not need such predistorters since their spectra are almost unaffected by the nonlinear amplifier, Ibis report discusses several receiver structures for EFQPSK signals. It is observed that optimal receiver structures can be realized for both coded and uncoded EFQPSK

  10. Monotone Comparative Statics for the Industry Composition

    DEFF Research Database (Denmark)

    Laugesen, Anders Rosenstand; Bache, Peter Arendorf

    2015-01-01

    We let heterogeneous firms face decisions on a number of complementary activities in a monopolistically-competitive industry. The endogenous level of competition and selection regarding entry and exit of firms introduces a wedge between monotone comparative statics (MCS) at the firm level and MCS...... for the industry composition. The latter phenomenon is defined as first-order stochastic dominance shifts in the equilibrium distributions of all activities across active firms. We provide sufficient conditions for MCS at both levels of analysis and show that we may have either type of MCS without the other...

  11. Space Analogue Environments: Are the Populations Comparable?

    Science.gov (United States)

    Sandal, G. M.

    Background: Much of our present understanding about psychology in space is based on studies of groups operating in so-called analogue environments where personnel are exposed to many of the same stressors as those experienced by astronauts in space. One possible problem with extrapolating results is that personnel operating in various hazardous and confined environments might differ in characteristics influencing coping, interaction, and performance. The object of this study was to compare the psychological similarity of these populations in order to get a better understanding of whether this extrapolation is justifiable. The samples investigated include polar crossings (N= 22), personnel on Antarctic research stations (N= 183), several military occupations (N= 187), and participants in space simulation studies (N=20). Methods: Personnel in each of these environments were assessed using the Personality Characteristic Inventory (PCI) and Utrecht Coping List (UCL). The PCI is a multidimensional trait assessment battery that measures various aspects of achievement orientation and social competence. The UCL is a questionnaire designed to assess habitual coping strategies when encountering stressful or demanding situations. Results: Only minor differences in use of habitual coping strategies were evident across the different samples. In relation to personality scores, the military subjects and participants in space simulation studies indicated higher competitiveness and negative instrumentality compared to both the personnel on Antarctic research stations and participants in polar expedition. Among the personnel on Antarctic research stations, significant gender differences were found with women scoring lower on competitiveness, negative instrumentality and impatience/irritability. Compared to the other samples, the participants in polar expeditions were found to be more homogeneous in personality and no significant gender differences were evident on the traits that

  12. A comparative study of two shovel designs.

    Science.gov (United States)

    Degani, A; Asfour, S S; Waly, S M; Koshy, J G

    1993-10-01

    In the present study a modified shovel design with two perpendicular shafts is presented. This modified, two-shaft shovel was compared with a regular shovel. The modified shovel was evaluated and tested in a controlled laboratory environment using surface electromyography recorded from the lumbar paraspinal muscles. The new shovel design was also tested in a field study using ratings of perceived exertion. The results indicate that there was a significant reduction in EMG values of the lumbar paraspinal muscles and a consistent reduction in perceived exertion ratings while the modified shovel was being used for removing dirt in digging trenches up to 90 cm in depth.

  13. Leadership, Motivation and Excellence (A Comparative view

    Directory of Open Access Journals (Sweden)

    Gh. Gh. Ionescu

    2007-02-01

    Full Text Available In our paper we will try to compare the based or traditional theories with some new ideas like those of Burns (1978 and some philosophical underpinnings will be analyzed. It should be kept in mind that our main goal is to insure that the reader understands the applications of this work to the real world of organizations and management. The special unique relationships, interactions, and roadblocks presented by the similarities and complementary nature of the kinship of leadership and motivation will emerge as we go along. Keep in mind that our practical approach merges the two throughout the paper.

  14. Comparing methods for involving users in ideation

    DEFF Research Database (Denmark)

    Nicolajsen, Hanne Westh; Scupola, Ada; Sørensen, Flemming

    2015-01-01

    workshop method (involving users and employees) is especially good at qualifying and further developing ideas. The findings suggest that methods for involving users in ideation should be carefully selected and combined to achieve optimum benefits and avoid potential disadvantages.......In this paper we discuss how users may be involved in the ideation phase of innovation. The study compares the use of a blog and three future workshops (students, employees and a mix of the two) in a library. Our study shows that the blog is efficient in giving the users voice whereas the mixed...

  15. Comparing composts formed by different technological processing

    Science.gov (United States)

    Lyckova, B.; Mudrunka, J.; Kucerova, R.; Glogarova, V.

    2017-10-01

    The presented article compares quality of composts which were formed by different technological processes. The subject to comparison was a compost which was created in a closed fermenter where ideal conditions for decomposition and organic substances conversion were ensured, with compost which was produced in an open box of community composting. The created composts were analysed to determine whether it is more important for the final compost to comply with the composting conditions or better sorting of raw materials needed for compost production. The results of the carried out experiments showed that quality of the resulting compost cannot be determined unequivocally.

  16. Comparative International Communication Projects: Overcoming the Challenges

    Directory of Open Access Journals (Sweden)

    Frank Esser

    2007-12-01

    Full Text Available Over the last 10-20 years, comparative research in the feld of communication has almost become fashionable. Many factors are responsible for this, for example: an increased awareness of globalisation as a communication-driven process; an awareness of increased transnational conglomerization of media organizations; and the increasing use of the Internet which facilitates easier access to information around the world. But the big question is how to organize collaborative international communication research efectively? Which models of cooperation are available to us, and what are their advantages and disadvantages? In this article, I analyze fve ways of doing collaborative researches and their respective challenges.

  17. Comparative evaluation of trace elements in blood

    International Nuclear Information System (INIS)

    Goeij, J.J.M. de; Tjioe, P.S.; Pries, C.; Zwiers, J.H.L.

    1976-01-01

    The Interuniversitair Reactor Instituut and the Centraal Laboratorium TNO have carried out a common investigation on neutron-activation-analytical procedures for the determination of trace elements in blood. A comparative evaluation of five methods, destructive as well as non-destructive, is given. The sensitivity and reproducibility of the procedures are discussed. By combining some of the methods it is possible, starting with 1 ml blood, to give quantitative information on 14 important trace elements: antimony, arsenic, bromine, cadmium, cobalt, gold, copper, mercury, molybdenum, nickel, rubidium, selenium, iron and zinc. The methods have also been applied to sodium, chromium and potassium

  18. Greenfields and acquisitions: a comparative analysis

    Directory of Open Access Journals (Sweden)

    Nicolae MARINESCU

    2016-07-01

    Full Text Available This paper compares greenfields and acquisitions as foreign direct investment (FDI alternatives used by transnational corporations (TNCs. First, the determinants leading to the choice of companies between the two modes of entry into a foreign market are laid out. Then, specific features of each alternative are highlighted, by contrasting the advantages and disadvantages of both types of FDI. Based on this analysis, some conclusions are drawn in the end concerning the most important factors that influence the decision of a company whether to choose a greenfield investment or an acquisition.

  19. Comparing linear probability model coefficients across groups

    DEFF Research Database (Denmark)

    Holm, Anders; Ejrnæs, Mette; Karlson, Kristian Bernt

    2015-01-01

    of the following three components: outcome truncation, scale parameters and distributional shape of the predictor variable. These results point to limitations in using linear probability model coefficients for group comparisons. We also provide Monte Carlo simulations and real examples to illustrate......This article offers a formal identification analysis of the problem in comparing coefficients from linear probability models between groups. We show that differences in coefficients from these models can result not only from genuine differences in effects, but also from differences in one or more...... these limitations, and we suggest a restricted approach to using linear probability model coefficients in group comparisons....

  20. Comparative genomics of Lactobacillus and other LAB

    DEFF Research Database (Denmark)

    Wassenaar, Trudy M.; Lukjancenko, Oksana

    2014-01-01

    that of the others, with the two Streptococcus species having the shortest genomes. The widest distribution in genome content was observed for Lactobacillus. The number of tRNA and rRNA gene copies varied considerably, with exceptional high numbers observed for Lb. delbrueckii, while these numbers were relatively......The genomes of 66 LABs, belonging to five different genera, were compared for genome size and gene content. The analyzed genomes included 37 Lactobacillus genomes of 17 species, six Lactococcus lactis genomes, four Leuconostoc genomes of three species, six Streptococcus genomes of two species...

  1. Scatterometry or imaging overlay: a comparative study

    Science.gov (United States)

    Hsu, Simon C. C.; Pai, Yuan Chi; Chen, Charlie; Yu, Chun Chi; Hsing, Henry; Wu, Hsing-Chien; Kuo, Kelly T. L.; Amir, Nuriel

    2015-03-01

    Most fabrication facilities today use imaging overlay measurement methods, as it has been the industry's reliable workhorse for decades. In the last few years, third-generation Scatterometry Overlay (SCOL™) or Diffraction Based Overlay (DBO-1) technology was developed, along another DBO technology (DBO-2). This development led to the question of where the DBO technology should be implemented for overlay measurements. Scatterometry has been adopted for high volume production in only few cases, always with imaging as a backup, but scatterometry overlay is considered by many as the technology of the future. In this paper we compare imaging overlay and DBO technologies by means of measurements and simulations. We outline issues and sensitivities for both technologies, providing guidelines for the best implementation of each. For several of the presented cases, data from two different DBO technologies are compared as well, the first with Pupil data access (DBO-1) and the other without pupil data access (DBO-2). Key indicators of overlay measurement quality include: layer coverage, accuracy, TMU, process robustness and robustness to process changes. Measurement data from real cases across the industry are compared and the conclusions are also backed by simulations. Accuracy is benchmarked with reference OVL, and self-consistency, showing good results for Imaging and DBO-1 technology. Process sensitivity and metrology robustness are mostly simulated with MTD (Metrology Target Designer) comparing the same process variations for both technologies. The experimental data presented in this study was done on ten advanced node layers and three production node layers, for all phases of the IC fabrication process (FEOL, MEOL and BEOL). The metrology tool used for most of the study is KLA-Tencor's Archer 500LCM system (scatterometry-based and imaging-based measurement technologies on the same tool) another type of tool is used for DBO-2 measurements. Finally, we conclude that

  2. [Nonprocess autism in children: comparative etiopathogenetic study].

    Science.gov (United States)

    Kagan, V E

    1979-01-01

    Etiopathogenesis of the childhood autism syndrome of a non-process nature is discussed on the basis of a comparative study of 156 children aged from 3 to 16 years. In the etiological complex there is a prevalence of early exogenous-organic noxious factors, which is reflected in disturbances of mental divelopment, maturation of the system of hemispheric pair work. The data of follow-up studies and treatment confirm a conclusion about a residual-organic basis in the syndrome of childhood autism.

  3. Comparative analysis of proliferation resistance assessment methodologies

    International Nuclear Information System (INIS)

    Takaki, Naoyuki; Kikuchi, Masahiro; Inoue, Naoko; Osabe, Takeshi

    2005-01-01

    Comparative analysis of the methodologies was performed based on the discussions in the international workshop on 'Assessment Methodology of Proliferation Resistance for Future Nuclear Energy Systems' held in Tokyo, on March 2005. Through the workshop and succeeding considerations, it is clarified that the proliferation resistance assessment methodologies are affected by the broader nuclear options being pursued and also by the political situations of the state. Even the definition of proliferation resistance, despite the commonality of fundamental issues, derives from perceived threat and implementation circumstances inherent to the larger programs. Deep recognitions of the 'difference' among communities would help us to make further essential and progressed discussion with harmonization. (author)

  4. Comparative trials in registration files of cardiovascular drugs : Comparator drugs and dosing schemes.

    NARCIS (Netherlands)

    Wieringa, NF; Vos, R; de Graeff, PA

    Registration files of 13 cardiovascular drugs were analysed with respect to the number of double-blind phase-III clinical trials, the use of placebo and active comparator drugs and their dosing schemes. Half of the 146 double-blind trials used active comparator drugs. The majority of files included

  5. Comparative Genome Analysis of Enterobacter cloacae

    Science.gov (United States)

    Liu, Wing-Yee; Wong, Chi-Fat; Chung, Karl Ming-Kar; Jiang, Jing-Wei; Leung, Frederick Chi-Ching

    2013-01-01

    The Enterobacter cloacae species includes an extremely diverse group of bacteria that are associated with plants, soil and humans. Publication of the complete genome sequence of the plant growth-promoting endophytic E. cloacae subsp. cloacae ENHKU01 provided an opportunity to perform the first comparative genome analysis between strains of this dynamic species. Examination of the pan-genome of E. cloacae showed that the conserved core genome retains the general physiological and survival genes of the species, while genomic factors in plasmids and variable regions determine the virulence of the human pathogenic E. cloacae strain; additionally, the diversity of fimbriae contributes to variation in colonization and host determination of different E. cloacae strains. Comparative genome analysis further illustrated that E. cloacae strains possess multiple mechanisms for antagonistic action against other microorganisms, which involve the production of siderophores and various antimicrobial compounds, such as bacteriocins, chitinases and antibiotic resistance proteins. The presence of Type VI secretion systems is expected to provide further fitness advantages for E. cloacae in microbial competition, thus allowing it to survive in different environments. Competition assays were performed to support our observations in genomic analysis, where E. cloacae subsp. cloacae ENHKU01 demonstrated antagonistic activities against a wide range of plant pathogenic fungal and bacterial species. PMID:24069314

  6. Comparative Genomics of Ten Solanaceous Plastomes

    Directory of Open Access Journals (Sweden)

    Harpreet Kaur

    2014-01-01

    Full Text Available Availability of complete plastid genomes of ten solanaceous species, Atropa belladonna, Capsicum annuum, Datura stramonium, Nicotiana sylvestris, Nicotiana tabacum, Nicotiana tomentosiformis, Nicotiana undulata, Solanum bulbocastanum, Solanum lycopersicum, and Solanum tuberosum provided us with an opportunity to conduct their in silico comparative analysis in depth. The size of complete chloroplast genomes and LSC and SSC regions of three species of Solanum is comparatively smaller than that of any other species studied till date (exception: SSC region of A. belladonna. AT content of coding regions was found to be less than noncoding regions. A duplicate copy of trnH gene in C. annuum and two alternative tRNA genes for proline in D. stramonium were observed for the first time in this analysis. Further, homology search revealed the presence of rps19 pseudogene and infA genes in A. belladonna and D. stramonium, a region identical to rps19 pseudogene in C. annum and orthologues of sprA gene in another six species. Among the eighteen intron-containing genes, 3 genes have two introns and 15 genes have one intron. The longest insertion was found in accD gene in C. annuum. Phylogenetic analysis using concatenated protein coding sequences gave two clades, one for Nicotiana species and another for Solanum, Capsicum, Atropa, and Datura.

  7. Comparative Assessment of Energy Supply Options

    International Nuclear Information System (INIS)

    Rogner, H.-H.; Vladu, I. F.

    2000-01-01

    The complexity facing today's energy planners and decision-makers, particularly in electricity sector, has increased. They must take into account many elements in selecting technologies and strategies that will impact near term energy development and applications in their countries. While costs remain a key factor, tradeoffs between the demands of environmental protection and economic development will have to be made. This fact, together with the needs of many countries to define their energy and electricity programmes in a sustainable manner, has resulted in a growing interest in the application of improved data, tools and techniques for comparative assessment of different electricity generation options, particularly from an environmental and human health viewpoint. Although global emissions of greenhouse gases and other pollutants, e.g. SO 2 , NO x and particulate, must be reduced, the reality today is that these emissions are increasing and are expected to continue increasing. In examining the air pollutants, as well as water effluents and solid waste generated by electricity production, it is necessary to assess the full energy chain from fuel extraction to waste disposal, including the production of construction and auxiliary materials. The paper describes this concept and illustrates its implementation for assessing and comparing electricity generation costs, emissions, wastes and other environmental burdens from different energy sources. (author)

  8. How does cognition evolve? Phylogenetic comparative psychology.

    Science.gov (United States)

    MacLean, Evan L; Matthews, Luke J; Hare, Brian A; Nunn, Charles L; Anderson, Rindy C; Aureli, Filippo; Brannon, Elizabeth M; Call, Josep; Drea, Christine M; Emery, Nathan J; Haun, Daniel B M; Herrmann, Esther; Jacobs, Lucia F; Platt, Michael L; Rosati, Alexandra G; Sandel, Aaron A; Schroepfer, Kara K; Seed, Amanda M; Tan, Jingzhi; van Schaik, Carel P; Wobber, Victoria

    2012-03-01

    Now more than ever animal studies have the potential to test hypotheses regarding how cognition evolves. Comparative psychologists have developed new techniques to probe the cognitive mechanisms underlying animal behavior, and they have become increasingly skillful at adapting methodologies to test multiple species. Meanwhile, evolutionary biologists have generated quantitative approaches to investigate the phylogenetic distribution and function of phenotypic traits, including cognition. In particular, phylogenetic methods can quantitatively (1) test whether specific cognitive abilities are correlated with life history (e.g., lifespan), morphology (e.g., brain size), or socio-ecological variables (e.g., social system), (2) measure how strongly phylogenetic relatedness predicts the distribution of cognitive skills across species, and (3) estimate the ancestral state of a given cognitive trait using measures of cognitive performance from extant species. Phylogenetic methods can also be used to guide the selection of species comparisons that offer the strongest tests of a priori predictions of cognitive evolutionary hypotheses (i.e., phylogenetic targeting). Here, we explain how an integration of comparative psychology and evolutionary biology will answer a host of questions regarding the phylogenetic distribution and history of cognitive traits, as well as the evolutionary processes that drove their evolution.

  9. How does cognition evolve? Phylogenetic comparative psychology

    Science.gov (United States)

    Matthews, Luke J.; Hare, Brian A.; Nunn, Charles L.; Anderson, Rindy C.; Aureli, Filippo; Brannon, Elizabeth M.; Call, Josep; Drea, Christine M.; Emery, Nathan J.; Haun, Daniel B. M.; Herrmann, Esther; Jacobs, Lucia F.; Platt, Michael L.; Rosati, Alexandra G.; Sandel, Aaron A.; Schroepfer, Kara K.; Seed, Amanda M.; Tan, Jingzhi; van Schaik, Carel P.; Wobber, Victoria

    2014-01-01

    Now more than ever animal studies have the potential to test hypotheses regarding how cognition evolves. Comparative psychologists have developed new techniques to probe the cognitive mechanisms underlying animal behavior, and they have become increasingly skillful at adapting methodologies to test multiple species. Meanwhile, evolutionary biologists have generated quantitative approaches to investigate the phylogenetic distribution and function of phenotypic traits, including cognition. In particular, phylogenetic methods can quantitatively (1) test whether specific cognitive abilities are correlated with life history (e.g., lifespan), morphology (e.g., brain size), or socio-ecological variables (e.g., social system), (2) measure how strongly phylogenetic relatedness predicts the distribution of cognitive skills across species, and (3) estimate the ancestral state of a given cognitive trait using measures of cognitive performance from extant species. Phylogenetic methods can also be used to guide the selection of species comparisons that offer the strongest tests of a priori predictions of cognitive evolutionary hypotheses (i.e., phylogenetic targeting). Here, we explain how an integration of comparative psychology and evolutionary biology will answer a host of questions regarding the phylogenetic distribution and history of cognitive traits, as well as the evolutionary processes that drove their evolution. PMID:21927850

  10. Soft Biometrics; Human Identification Using Comparative Descriptions.

    Science.gov (United States)

    Reid, Daniel A; Nixon, Mark S; Stevenage, Sarah V

    2014-06-01

    Soft biometrics are a new form of biometric identification which use physical or behavioral traits that can be naturally described by humans. Unlike other biometric approaches, this allows identification based solely on verbal descriptions, bridging the semantic gap between biometrics and human description. To permit soft biometric identification the description must be accurate, yet conventional human descriptions comprising of absolute labels and estimations are often unreliable. A novel method of obtaining human descriptions will be introduced which utilizes comparative categorical labels to describe differences between subjects. This innovative approach has been shown to address many problems associated with absolute categorical labels-most critically, the descriptions contain more objective information and have increased discriminatory capabilities. Relative measurements of the subjects' traits can be inferred from comparative human descriptions using the Elo rating system. The resulting soft biometric signatures have been demonstrated to be robust and allow accurate recognition of subjects. Relative measurements can also be obtained from other forms of human representation. This is demonstrated using a support vector machine to determine relative measurements from gait biometric signatures-allowing retrieval of subjects from video footage by using human comparisons, bridging the semantic gap.

  11. Comparative Analysis of 37 Acinetobacter Bacteriophages

    Directory of Open Access Journals (Sweden)

    Dann Turner

    2017-12-01

    Full Text Available Members of the genus Acinetobacter are ubiquitous in the environment and the multiple-drug resistant species A. baumannii is of significant clinical concern. This clinical relevance is currently driving research on bacterial viruses infecting A. baumannii, in an effort to implement phage therapy and phage-derived antimicrobials. Initially, a total of 42 Acinetobacter phage genome sequences were available in the international nucleotide sequence databases, corresponding to a total of 2.87 Mbp of sequence information and representing all three families of the order Caudovirales and a single member of the Leviviridae. A comparative bioinformatics analysis of 37 Acinetobacter phages revealed that they form six discrete clusters and two singletons based on genomic organisation and nucleotide sequence identity. The assignment of these phages to clusters was further supported by proteomic relationships established using OrthoMCL. The 4067 proteins encoded by the 37 phage genomes formed 737 groups and 974 orphans. Notably, over half of the proteins encoded by the Acinetobacter phages are of unknown function. The comparative analysis and clustering presented enables an updated taxonomic framing of these clades.

  12. Morality and politics: Comparing alternate theories.

    Science.gov (United States)

    Miles, Andrew; Vaisey, Stephen

    2015-09-01

    Debates about the American "culture wars" have led scholars to develop several theories relating morality to political attitudes and behaviors. However, researchers have not adequately compared these theories, nor have they examined the overall contribution of morality to explaining political variation. This study uses nationally representative data to compare the utility of 19 moral constructs from four research traditions - associated with the work of Hunter, Lakoff, Haidt, and Schwartz - for predicting political orientation (liberalism/conservatism). Results indicate that morality explains a third of the variation in political orientation - more than basic demographic and religious predictors - but that no one theory provides a fully adequate explanation of this phenomenon. Instead, political orientation is best predicted by selected moral constructs that are unique to each of the four traditions, and by two moral constructs that crosscut them. Future work should investigate how these moral constructs can be synthesized to create a more comprehensive theory of morality and politics. Copyright © 2015 Elsevier Inc. All rights reserved.

  13. A comparative table of various energy sources

    International Nuclear Information System (INIS)

    Anon.

    1976-01-01

    This table provides wide informations on the technological facets of various sources of primary energy. One of the outstanding features of this table is that it exposes and compares various technological problems involved in the energy conversion processes. The primary energy sources treated here are the solar energy (heat and light are treated separately), the geothermal energy, coal (gasification and liquefaction are treated separately), oil, natural gas, oceano-energy (tidal energy, temperature difference, and wave energy are treated separately), organic wastes, oil shale, tar sand, hydraulic power, wind power, biomass, uranium, thorium, and deuterium and lithium. On the other hand, the comparisons are made in three major items, i.e. charactersitics as natural resources, conversion or refinement to secondary energy sources, and economical characteristics. The first item includes the estimated and recognized amount of deposits, easiness of mining, storage, and transportation, and cleanliness and safety. As for conversion characteristics, the easiness, controlability, efficiency, cleanliness, and safety of various conversion processes are compared. Finally, as for economical problems, cost comparisons are made for gathering or mining those resources, including required energy input, man power, required facilities, and site conditions. (Aoki, K.)

  14. Comparative table of various energy sources

    Energy Technology Data Exchange (ETDEWEB)

    1976-08-01

    This table provides wide informations on the technological facets of various sources of primary energy. One of the outstanding features of this table is that it exposes and compares various technological problems involved in the energy conversion processes. The primary energy sources treated here are the solar energy (heat and light are treated separately), the geothermal energy, coal (gasification and liquefaction are treated separately), oil, natural gas, oceano-energy (tidal energy, temperature difference, and wave energy are treated separately), organic wastes, oil shale, tar sand, hydraulic power, wind power, biomass, uranium, thorium, and deuterium and lithium. On the other hand, the comparisons are made in three major items, i.e. charactersitics as natural resources, conversion or refinement to secondary energy sources, and economical characteristics. The first item includes the estimated and recognized amount of deposits, easiness of mining, storage, and transportation, and cleanliness and safety. As for conversion characteristics, the easiness, controlability, efficiency, cleanliness, and safety of various conversion processes are compared. Finally, as for economical problems, cost comparisons are made for gathering or mining those resources, including required energy input, man power, required facilities, and site conditions.

  15. Characteristics of students in comparative problem solving

    Science.gov (United States)

    Irfan, M.; Sudirman; Rahardi, R.

    2018-01-01

    Often teachers provided examples and exercised to students with regard to comparative problems consisting of one quantity. In this study, the researchers gave the problem of comparison with the two quantities mixed. It was necessary to have a good understanding to solve this problem. This study aimed to determine whether students understand the comparison in depth and be able to solve the problem of non-routine comparison. This study used qualitative explorative methods, with researchers conducting in-depth interviews on subjects to explore the thinking process when solving comparative problems. The subject of this study was three students selected by purposive sampling of 120 students. From this research, researchers found there were three subjects with different characteristics, namely: subject 1, he did the first and second questions with methods of elimination and substitution (non-comparison); subject 2, he did the first question with the concept of comparison although the answer was wrong, and did the second question with the method of elimination and substitution (non-comparison); and subject 3, he did both questions with the concept of comparison. In the first question, he did wrong because he was unable to understand the problem, while on the second he did correctly. From the characteristics of the answers, the researchers divided into 3 groups based on thinking process, namely: blind-proportion, partial-proportion, and proportion thinking.

  16. Comparative economics of the main electricity sources

    International Nuclear Information System (INIS)

    Jones, P.M.S.

    1991-01-01

    Few participants in the Uranium Institute's Symposium would fail to agree that nuclear power has considerable environmental and ecological advantages over fossil fuel combustion. There would, however, be far less unanimity, even among a favourably inclined group, on the economic attractiveness of nuclear power and its competitive position vis-a-vis other electricity generation options. To the layman the conflicting claims are confusing, not least because nuclear power often appears to be the only product surrounded by such controversy. Some of the principal reasons are listed. Of these, deficiencies in understanding and divergent value standards are identified as particularly important. The latter issue has a major effect on comparative economics, when incorporated into the calculations of the cost of nuclear power when compared to its alternatives. In this paper the nature of the comparisons that can usefully be made is defined, then the results of recent international studies and their implications are outlined. Confusions arising from the privatisation of the electricity supply industry in the United Kingdom are examined and the implications of taking a wider view of economic comparisons are examined. (author)

  17. p-adic analysis compared with real

    CERN Document Server

    Katok, Svetlana

    2007-01-01

    The book gives an introduction to p-adic numbers from the point of view of number theory, topology, and analysis. Compared to other books on the subject, its novelty is both a particularly balanced approach to these three points of view and an emphasis on topics accessible to undergraduates. In addition, several topics from real analysis and elementary topology which are not usually covered in undergraduate courses (totally disconnected spaces and Cantor sets, points of discontinuity of maps and the Baire Category Theorem, surjectivity of isometries of compact metric spaces) are also included in the book. They will enhance the reader's understanding of real analysis and intertwine the real and p-adic contexts of the book. The book is based on an advanced undergraduate course given by the author. The choice of the topic was motivated by the internal beauty of the subject of p-adic analysis, an unusual one in the undergraduate curriculum, and abundant opportunities to compare it with its much more familiar real...

  18. Comparing diagnostic tests on benefit-risk.

    Science.gov (United States)

    Pennello, Gene; Pantoja-Galicia, Norberto; Evans, Scott

    2016-01-01

    Comparing diagnostic tests on accuracy alone can be inconclusive. For example, a test may have better sensitivity than another test yet worse specificity. Comparing tests on benefit risk may be more conclusive because clinical consequences of diagnostic error are considered. For benefit-risk evaluation, we propose diagnostic yield, the expected distribution of subjects with true positive, false positive, true negative, and false negative test results in a hypothetical population. We construct a table of diagnostic yield that includes the number of false positive subjects experiencing adverse consequences from unnecessary work-up. We then develop a decision theory for evaluating tests. The theory provides additional interpretation to quantities in the diagnostic yield table. It also indicates that the expected utility of a test relative to a perfect test is a weighted accuracy measure, the average of sensitivity and specificity weighted for prevalence and relative importance of false positive and false negative testing errors, also interpretable as the cost-benefit ratio of treating non-diseased and diseased subjects. We propose plots of diagnostic yield, weighted accuracy, and relative net benefit of tests as functions of prevalence or cost-benefit ratio. Concepts are illustrated with hypothetical screening tests for colorectal cancer with test positive subjects being referred to colonoscopy.

  19. A comparative analysis of capacity adequacy policies

    International Nuclear Information System (INIS)

    Doorman, Gerard; Botterud, Audun; Wolfgang, Ove

    2007-06-01

    In this paper a stochastic dynamic optimization model is used to analyze the effect of different generation adequacy policies in restructured power systems. The expansion decisions of profit-maximizing investors are simulated under a number of different market designs: Energy Only with and without a price cap, Capacity Payment, Capacity Obligation, Capacity Subscription, and Demand Elasticity. The results show that the overall social welfare is reduced compared to a centralized social welfare optimization for all policies except Capacity Subscription and Demand Elasticity. In particular, an energy only market with a low price cap leads to a significant increase in involuntary load shedding. Capacity payments and obligations give additional investment incentives and more generating capacity, but also result in a considerable transfer of wealth from consumers to producers due to the capacity payments. Increased demand elasticity increases social welfare, but also results in a transfer from producers to consumers, compared to the theoretical social welfare optimum. In contrast, the capacity subscription policy increases the social welfare, and both producers and consumers benefit. This is possible because capacity subscription explicitly utilizes differences in consumers' preferences for uninterrupted supply. This advantage must be weighed against the cost of implementation, which is not included in the model.

  20. Comparative genomics and evolution of eukaryotic phospholipidbiosynthesis

    Energy Technology Data Exchange (ETDEWEB)

    Lykidis, Athanasios

    2006-12-01

    Phospholipid biosynthetic enzymes produce diverse molecular structures and are often present in multiple forms encoded by different genes. This work utilizes comparative genomics and phylogenetics for exploring the distribution, structure and evolution of phospholipid biosynthetic genes and pathways in 26 eukaryotic genomes. Although the basic structure of the pathways was formed early in eukaryotic evolution, the emerging picture indicates that individual enzyme families followed unique evolutionary courses. For example, choline and ethanolamine kinases and cytidylyltransferases emerged in ancestral eukaryotes, whereas, multiple forms of the corresponding phosphatidyltransferases evolved mainly in a lineage specific manner. Furthermore, several unicellular eukaryotes maintain bacterial-type enzymes and reactions for the synthesis of phosphatidylglycerol and cardiolipin. Also, base-exchange phosphatidylserine synthases are widespread and ancestral enzymes. The multiplicity of phospholipid biosynthetic enzymes has been largely generated by gene expansion in a lineage specific manner. Thus, these observations suggest that phospholipid biosynthesis has been an actively evolving system. Finally, comparative genomic analysis indicates the existence of novel phosphatidyltransferases and provides a candidate for the uncharacterized eukaryotic phosphatidylglycerol phosphate phosphatase.