453 resultados para Energia escura (Astronomia)


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Based on climatological data and energy flow, this paper analyzes the behavior observed in microclimatic an important remnant of cerrado in the São Paulo State. The seasonal climate is well marked, in the study area, with two climatic periods (one dry and one wet). The vegetation presents physiology as a function of water availability and the local thermal conditions and can be seen marked changes in the landscape due to the more or less presence of solar radiation. It’s important to understand the ecosystems behave in the context of global change. It has gained the attention of many researchers in the world.

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This paper presents a historical retrospective concerning data from a research in Astronomy Education in Brazil, after 1973. It was organized on the basis of the speech analysis of national researchers considered references in this field by their peers. Furthermore, it was elaborated on the basis of other studies from the areas of Science Education, Physics and Astronomy. This historical overview was developed in order to facilitate understanding of the contexts in which the interviewed researchers have developed professionally. Moreover, we attempted to recover the memory of the growing field of research in Astronomy Education in the country. We believe that the history presented can help those trying to understand the past in an attempt to resolve current and future demands.

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We present here a qualitative analysis of a sample of papers published in Brazilian science education journals, which expresses researchers discourses related to Astronomy Education. Within this analytical universe, we sought for discursive excerpts about their justifications for the teaching of this subject, which made the basis for the production of a collective discourse, which identity is socially represented by the researchers authors set. Setting up articulations with discourse analysis, the procedures of the collective subject discourse show to be an important methodological tool to answer to the central question of this study: what do the Brazilian researchers assert as justifications for teaching Astronomy? In other words: why teach Astronomy? Outcomes point to the retaking of reflections about the importance of matters like as Astronomy in formal education, catalyzing teachers work innovative articulations.

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The use of digesters has become an important alternative for the proper disposal of organic agricultural wastes, serving as a solution to some environmental and health problems. Furthermore, the process of digestion provides commercially valuable by products such as biogas and bio fertilizer. The generation of biogas from agricultural waste, and its use in power generation systems has aroused great interest in rural areas because it enables supply in whole or in large part the energy demand of ownership by reducing production costs. The advent of technology has brought new forms of energy conversion of biogas, as the use of micro turbines specifies to be fuelled with biogas derived from the decomposition of organic matter in digesters, since it has a low level of methane in its composition, and high degree of impurities such as hydrogen sulphide, which are harmful to equipment and reduce the calorific value of biogas. The use of micro turbines behind other advantages like low emissions, great fuel flexibility and low maintenance. This paper presents an analysis of the feasibility of using biogas generated from cattle manure in micro turbines to generate electricity. Behind also an assessment of the energy potential that each animal has on various uses of biogas, and forms of energy recovery from the exhaust gases of the micro turbine. Also conducts an evaluation of the energy savings that the use of biogas aggregates properties.

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Pós-graduação em Engenharia Elétrica - FEIS

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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O presente trabalho demonstra por meio da estatística descritiva a situação de faturamento de energia elétrica de uma usina de açúcar e álcool da região de Quatá. Com o intuito de avaliar a utilização da energia elétrica da usina, foram descritos os fatores que interferem no uso da energia elétrica, dados pelo fator de carga (fc) e fator de potência (fp). Nesse trabalho optamos pela estatística descritiva, cujo objetivo básico é o de sintetizar uma série de valores de mesma natureza, permitindo dessa forma que se tenha uma visão global da variação desses valores, organizando e descrevendo os dados de três maneiras: por meio de tabelas, de gráficos e de medidas descritivas. Foi elaborada uma planilha com a média de todos os meses dos anos de 2008 a 2010 a partir dos dados fornecidos pela concessionária de energia elétrica. Foi verificado que a empresa é extremamente eficiente, fato verificado durante estes três anos pela avaliação do fator de potência que geralmente foi 1,0. A empresa foi em média considerada racional, pois seu fator de carga calculado foi avaliado como regular nestes 3 anos.