Fuel Elements
Mostrando 25-36 de 45 artigos, teses e dissertações.
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25. AVALIAÇÃO DA SUSTENTABILIDADE BIOFÍSICA DO SOCIOECOSSISTEMA SÃO LUIS, ATRAVÉS DO ÍNDICE PEGADA ECOLÓGICA. / EVALUATION OF SUSTAINABILITY BIOPHYSICS SÃO LUIS SOCIOECOSYSTEMIC, THROUGH THE ECOLOGICAL FOOTPRINT CONTENTS
The 7,4 billion hectares of lands ecologically productive available for human use are decreasing in an abrupt way, since last century and, more intensely, in the last decades, mainly due to the significant increase of the world human population and the consumption produced by that. From this fact, the concept of sustainability began to be part of the scienti
Publicado em: 2008
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26. Aplicação da teoria ac de eletrodos porosos na investigação da cinética de dispositivos eletrocatalíticos / Application of ac theory for porous electrode in the investigation in the kinetics of electrocatalytic devises
This work consists in using Electrochemical Impedance Spectroscopy (EIS) in the research of various electrocatalytic materials. The porous electrode model is a very promising approach to treat the frequency responses of Dimensionally Stable Anodes (DSA®). Once the application of the model is established, it is possible to obtain important kinetic informatio
Publicado em: 2008
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27. Prospective analysis of the pattern of expansion of the sector sucroenergético Brazil: an application of probabilistic models with data-georeferenciated / Análise prospectiva do padrão de expansão do setor sucroenergético brasileiro: uma aplicação de modelos probabilísticos com dados georeferenciados
With expectations of a growing international market for biofuels, where Brazil would be a natural leader in the ethanol, several questions arise regarding the sustainability of Brazilian ethanol expansion: what would be the environmental, social and economic inpacts of sugarcane expansion in a scenario of significant ethanol exports? What regions would be mo
Publicado em: 2008
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28. Estudo dos processos de corrosão de aços API 5L X70 em contato com alguns dos solos do Brasil / Study of API 5L X70 steel corrosion processes when in contact with some brazilian soils
Polidutos, tanques de armazenamento de combustíveis e outras estruturas metálicas estão em constante contato com diferentes tipos de solos, diversos horizontes ou camadas, expostos à ação corrosiva nessa interação. Isso possibilita a ocorrência de danos de conseqüências expressivas ao ambiente e à expectativa de trabalho, podendo implicar em cont
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/03/2007
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29. O Estado Moderno: elementos de formação e de transformação
The objective of this dissertation is to relate the several determining and transforming elements of the so-called modern state, especially by means of analysis of the period between the Sixteenth and Eighteenth centuries. It will show the dynamics of the most important phenomena which served to fuel several conflicts of interest throughout history, whose re
Publicado em: 2007
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30. Issuance of metals by motor vehicles and their effects on public health / Emissão de metais por veículos automotores e seus efeitos à saúde pública
Introduction: The presence of fine metal particles in the urban atmosphere is a big concern considering that a significant accumulation of these elements has been registered during the last decades. Information about metal level in the tailpipe is scarce and specific Brazilian emission references are basically inexistent. Objective. Experimentally characteri
Publicado em: 2007
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31. Fronts and frontogenesis during summer: geometrical and dynamical aspects and the influence over rainfall on the South American subtropics / Frentes e frontogênese no verão: aspectos geométricos, dinâmicos e impactos sobre as chuvas nos subtrópicos da América do Sul
Three different aspects related to summer precipitation over subtropical South America (SA) and the continental pattern of humidity transport in that season are studied. Firstly, a climatological point of view is adopted and it is shown that most of the humidity that enters SA through its northern coast, up to Par´a, comes from the tropical Northern Atlanti
Publicado em: 2007
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32. Effects of the use of biodiesel on the properties of lubricating oil in a compression-ignition engine / Efeitos do uso do biodiesel sobre propriedades do óleo lubrificante usado em um motor de ignição por compressão
Adding to an ongoing sequence of tests aimed at validating the use of biodiesel (ethyl ester) mixed with diesel in higher proportions in Brazil, this study was conducted to investigate the effects of utilizing a B10 fuel mixture (10% volume biodiesel diluted in diesel) on the degradation of lubricating oil in an aspirated, indirect-injection, 1.9 L compressi
Publicado em: 2006
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33. Desenvolvimento de conversor comutado em baixa frequencia para aplicação em sistemas de geração distribuida baseados em celulas a combustivel / Development of a low-frequency commutation converter for distributed generation system based on fuel cells
The connection of distributed power sources with the utility grid generally needs an electronic power converter for processing the locally generated power and injecting current into the system. This work presents a system intended to low-power distributed generation composed by a DC primary source, as a fuel cell. A boost converter connects the supply to an
Publicado em: 2006
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34. DESENVOLVIMENTO E IMPLEMENTAÇÃO DE UMA MICRO-REDE AVANÇADA DE ALTA FREQÜÊNCIA PARA INTEGRAÇÃO DE FONTES ALTERNATIVAS DE ENERGIA / DEVELOPMENT AND IMPLEMENTATION OF AN ADVANCED HIGH FREQUENCY MICROGRID FOR INTEGRATION OF ALTERNATIVE ENERGY SOURCES
This Thesis presents a distributed generation system, which works as a Microgrid, suitable to integrate alternative energy sources, using a high frequency AC link (HFAC) as a means of connecting sources and loads. The static compensation of current harmonics, reactive power and voltage harmonics, which can be found in the Microgrid, is considered a key facto
Publicado em: 2006
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35. "Avaliação da contaminação da água subterrânea de poços tubulares, por combustíveis fósseis, no município de Santo André, São Paulo: Uma contribuição à gestão ambiental" / EVALUATION OF UNDERGROUND WATER CONTAMINATION OF TUBULAR WELLS, BY FUELS OIL IN SANTO ANDRÉ CITY, SÃO PAULO STATE: A CONTRIBUTION TO THE ENVIRONMENTAL MANAGEMENT
The contamination of underground waters by hydrocarbons originated from gas stations has been object of increasing preoccupation in environmental organization all over the world. The organic compounds Benzene, Toluene, Ethylbenzene and Xylene (BTEX), present in these fuels, are extremely toxic to human health and could make impracticable the exploration of t
Publicado em: 2006
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36. Investigação experimental da distribuição de temperaturas no reator nuclear de pesquisa TRIGA IPR-R1
The TRIGA-IPR-R1 Research Nuclear Reactor has completed 44 years in operation in November 2004. Its initial nominal thermal power was 30 kW. In 1979 its power was increased to 100 kW by adding new fuel elements to the reactor. Recently some more fuel elements were added to the core increasing the power to 250 kW. The TRIGA-IPR-R1 is a pool type reactor with
Publicado em: 2005