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Search Results: 1 - 10 of 5494 matches for " fluência "
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Fluência em filtros ceramicos de Al2O3
Salvini V. R.,Innocentini M. D. M.,Rodrigues J. A.,Pandolfelli V. C.
Ceramica , 2001,
Abstract: O comportamento de fluência em materiais ceramicos sólidos é afetado pela sua microestrutura. Fundamentalmente, s o três os parametros que influenciam o comportamento de fluência nestes materiais: o constituinte mineralógico, a fase vítrea e a porosidade. Além destes fatores microestruturais, a fluência em ceramicas celulares depende também da sua macroestrutura, constituída de um arranjo tridimensional de filamentos sólidos interligados. Assim, a análise dos resultados de fluência nestes materiais compreende duas etapas: na primeira deve-se identificar o modo de deforma o dos filamentos ceramicos (macroestrutura) e na segunda, identificar o(s) mecanismo(s) de fluência da microestrutura através dos parametros n (expoente da tens o aplicada) e Q (energia de ativa o do processo). Neste trabalho avaliou-se a fluência em filtros ceramicos de Al2O3 de 10 ppi sob compress o de 0,034; 0,051 e 0,068 MPa às temperaturas de 1500, 1550 e 1600 oC ao ar. De acordo com os resultados obtidos, sup e-se que o modo de deforma o por flambagem dos filamentos paralelos a carga aplicada é um dos principais fatores que contribui para o aumento da taxa de deforma o do filtro e, portanto, dos valores de n e Q. Além do modo de deforma o dos filamentos, observou-se que o tipo de ensaio de fluência (com ou sem troca de carga) também influencia a determina o dos valores de n e Q.
Retomando a Interrup o...
SOUZA E SILVA Maria Cecília Pérez de,CRESCITELLI Mercedes Fátima de Canha
DELTA: Documenta??o de Estudos em Lingüística Teórica e Aplicada , 1998,
Abstract: Este trabalho é uma continua o de outros estudos sobre interrup o que vêm sendo desenvolvidos desde 1995 pelo grupo "Organiza o textual interativa" no ambito do Projeto da Gramática do Português Falado. Nosso objetivo é explicitar o estatuto da interrup o: trata-se de um mecanismo de constru o do texto falado ou, apenas, de um índice de ocorrência de alguns desses mecanismos (corre o, paráfrase, repeti o, parênteses)? Para responder a essa quest o, analisamos seis inquéritos de natureza diferente (elocu es formais - EFs - , entrevistas - DIDs - e diálogos entre dois informantes - D2s), extraídos do Projeto NURC/SP, NURC/RJ e NURC/Recife. Do ponto de vista teórico, recorremos às pesquisas desenvolvidas pelo grupo acima mencionado, cujos artigos foram publicados na cole o: Gramática do Português Falado ( volumes IV, V e VI ) .
Concretos de alto desempenho: um novo conceito em refratários
Pileggi R. G.,Studart A. R.,Inocentinni M. D. M.,Pandolfelli V. C.
Ceramica , 2002,
Abstract: A história recente da indústria de refratários tem sido caracterizada pela contínua evolu o dos concretos. Atualmente, s o comuns os auto-escoantes, os bombeáveis, os de proje o, além dos tradicionais vibráveis, entre outros. Contudo, a classe reológica de um concreto define sua distribui o granulométrica, a qual também é responsável pelo comportamento de mistura, velocidade de secagem, consumo de água, fluência do material, etc. O presente trabalho teve como objetivo desenvolver um novo tipo de concreto, denominado de Alto Desempenho, o qual alia fácil mistura, fluidez elevada com baixo consumo de água, alta velocidade de secagem e reduzida deforma o por fluência. As formula es estudadas foram projetadas no software PSDesigner, sendo misturadas e avaliadas em um re metro para concretos. Os resultados demonstram que determinadas composi es, baseadas no modelo de Andreasen com q = 0,26, resultam em concretos de alto desempenho.
Altera es nas propriedades físicas do amálgama dental por perda de mercúrio durante a tritura o mecanica
NONAKA Tomio,VINHA Dionísio,CAMACHO Guilherme Bri?o,PANDOLFO Geovani Luis
Revista de Odontologia da Universidade de S?o Paulo , 1998,
Abstract: O objetivo deste trabalho é verificar, quantitativa e comparativamente, durante a tritura o mecanica do amálgama, a ocorrência de perdas de mercúrio em cápsulas, disponíveis em nosso mercado, e os possíveis efeitos dessas perdas sobre as propriedades físicas do material. Os efeitos analisados foram resistência à compress o, altera es dimensionais e fluência estática ("creep" estático).
“Swine flu”: when thinking globally and acting locally is more than just a slogan
Caterina Mammina
Iranian Journal of Microbiology , 2009,
Abstract:
What every Hepatologist should Know about Swine Flu?
Kamran Bagheri Lankarani
Hepatitis Monthly , 2009,
Abstract: As world is witnessing ever fastest growing pandemic, physicians with various specialties should adopt themselves to the new situation (1). Global death toll of swine flu by November 15, 2009, has raised to 6750. Many of those who died or were hospitalized suffered from comorbid conditions which increased either the severity or the risk of acquiring the disease (2). Swine flu may change the course of many chronic diseases. Thus, all physicians in different disciplines should realize and consider the impact of the current pandemic on their daily practice.As the new pandemic flu virus 2009 (H1N1) has been circulating only in the past nine months, there is still not much evidence on the interaction of this pandemic with chronic diseases. However, presumably, much of this interaction is expected to be similar to other circulating influenza type A viruses. But there are clear differences with the current pandemic , for example, near one-third of severe cases had no underlying conditions and their median age was much lower than the usual seasonal flu (3).Hepatologists caring for both acute and chronic liver diseases anywhere in the world would probably see much about this interaction in upcoming months and even years. In this review, we tried to somehow classify our current knowledge on possible interactions between swine flu and various liver diseases. Much of the described effects are from the older evidence mostly related to influenza type A, and as was mentioned before, with expansion of the current pandemic and growing our knowledge about the nature of this new virus, these suggestions might be changed later on.Liver damage by flu virus.Liver damage with influenza virus has been shown in animal models. Indeed, the mouse/influenza B virus is a well-established model for Reye's syndrome with a histological picture resembling human disease including microvesicular steatosis and minimal inflammation (4). The primary infected cells in these animals are hepatocytes with minimal infection of the Kuppfer cells (5). The liver parenchyma infection in mouse model is abortive or non-permissive characterized by the absence of viral replication in the liver and brain and absence of complete viral particles on electron microscopy, despite the presence of viral antigens within the hepatocytes and minimal inflammation in biopsied specimens (6).At least, in animal models the liver damage could be seen even in the absence of virus isolation from the liver. Circulating cytokines and chemokines may contribute to liver damage. Derangement of lipid metabolism secondary to depre
BIRD FLU (AVIAN INFLUENZA)
Ali ACAR,Bülent BE??RBELL?O?LU
TAF Preventive Medicine Bulletin , 2005,
Abstract: Avian influenza (bird flu) is a contagious disease of animals caused by influenza A viruses. These flu viruses occur naturally among birds. Actually, humans are not infected by bird flu viruses.. However, during an outbreak of bird flu among poultry, there is a possible risk to people who have contact infect birds or surface that have been contaminated with excreations from infected birds. Symptoms of bird flu in humans have ranged from typical flu-like symptoms to eye infections, pneumonia, severe respiratory diseases and other severe and life-threatening complications. In such situation, people should avoid contact with infected birds or contaminated surface, and should be careful when handling and cooking poultry.
Dual Use and Biosecurity: the Case of the Avian Flu H5N1  [PDF]
Pieter J. D. Drenth
Open Journal of Applied Sciences (OJAppS) , 2012, DOI: 10.4236/ojapps.2012.23017
Abstract: The classical dual use problem—the potential for harmful as well as beneficial application of scientific findings—has become more immediate in biotechnology than in most other fields of science. Terrorist misuse of the information on the development of pathogenic organisms can lead to catastrophic outcomes. Therefore, particular in biosciences researchers are faced with the dilemma to find a proper balance between the right to know and the dangers of knowing. In this paper this dilemma is illustrated by the research on the influenza A virus subtype H5N1, commonly known as “bird flu”. The pros and cons of the full publication on the development of a dangerous airborne type are discussed.
Communication Strategies and Foreign Language Speech Production
Gicele Vergine Vieira Prebianca,Mailce Borges Mota Fortkamp
Revista Brasileira de Linguística Aplicada , 2007,
Abstract: This study investigated the relationship between communication strategies use and foreign language (L2) oral production. Thirty participants were assigned to a pre-intermediate, an intermediate or an advanced group. Their oral fluency was assessed by means of speech rate (Lennon, 1990). L2 speech production was elicited by means of three narrative tasks in three different sessions. Data analysis revealed that the relationship between communication strategies use and L2 oral fluency, as measured by speech rate, is not statistically significant in any of the three proficiency levels. The analysis also revealed that speech rate, alone, is not enough to examine the relationship between communication strategies use and L2 speech production. To explain the few instances of significant statistical correlations between speech rate and types of communication strategies, it is suggested that due to the multitude of factors affecting L2 oral fluency, other aspects of speech production need to be taken into consideration. In addition, the nature of tasks and their cognitive demands might have contributed to learners' apparently limited oral improvement across sessions. Este estudo investiga a rela o entre o uso de estratégias de comunica o e o desempenho oral em uma língua estrangeira (L2). Trinta participantes foram alocados em grupos de nível pré-intermediário, intermediário e avan ado. A fluência oral dos participantes foi determinada por meio da velocidade de fala (Lennon, 1990). Três narrativas foram usadas para eliciar a produ o oral em L2, em três sess es diferentes. A análise revelou que a rela o entre estratégias de comunica o e fluência oral em L2, medida pela velocidade da fala, n o é estatisticamente significante em nenhum dos níveis de proficiência. Finalmente, a análise revelou que a variável velocidade da fala parece n o ser suficiente para examinar a rela o entre o uso de estratégias de comunica o e o desenvolvimento da produ o oral em L2. Para explicar os poucos exemplos de correla es estatisticamente significantes entre a velocidade da fala e tipos de estratégias de comunica o, é sugerido que, devido aos inúmeros fatores que afetam a fluência em L2, outros aspectos de produ o da fala sejam levados em considera o. Além disso, a natureza das tarefas propostas e a demanda cognitiva que essas tarefas exerceram podem ter contribuído para a aparentemente limitada melhora da produ o oral dos participantes ao longo das sess es.
Nueva gripe [A(H1N1) 2009]: definición de caso sospechoso. Revisión de la concordancia en los criterios de definición de caso utilizados en las distintas comunidades autónomas espa?olas
Hernández Merino,á.;
Pediatría Atención Primaria , 2009, DOI: 10.4321/S1139-76322009000400002
Abstract: introduction: the present pandemia by a novel flu virus and its potential and uncertain effects on the population, have produced an extraordinary amount of actions at all levels. all arrangements are based on data of the pandemia situation. this paper approaches the concordance in the suspected case definition criteria of infection by the new virus among the spanish autonomous communities (aa. cc.) and to discuss its possible impact on the validity of the cumulated information. material and methods: documents and official protocols of the aa. cc. health departments on novel flue suspected case definition have been compiled, while being in force the recording and information system based on the comprehensive and individualized record of cases. results: documents of 16 of the 17 aa. cc. (all but cantabria and the autonomous towns of ceuta and melilla) have been found. all the variables that take part in the definition of case show outstanding differences among the aa. cc. studied; especially the criteria of fever (with various level thresholds) and the clinical manifestations of the flu-like syndrome. discussion: there aren't two equal formulations of suspected case among the studied ones, what compromises the final validity of the cumulated data which are the basis for the analysis and arrangements made.
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