997 resultados para Filtros ativos de potência


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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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The intended purpose of this paper is to present the main commissioning tests for power transformers and the most used techniques in industrial segment, it is also discussed your results and consequences in the equipment’s normal operation. Also in this text, it is given specific information concerning a maintenance plan compatible to power transformers, with elements of preventive and predictive maintenance, exposing essential components, tests and the regulations current, showing how analyze and interpreted the results from this maintenance resources. Also in this paper is submitted the economic impact of damage to transformers and how the correct maintenance method can minimize them. The objective of this text is demonstrate the importance of the equipment and the benefits of proper maintenance, much of in financial terms as in electric system reliability

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Pós-graduação em Engenharia Elétrica - FEIS

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The Markowitz's objective functions, Value-at-Risk and Conditional Value-at-Risk, are largely used tools in the financial Market for portfolio optimization. This paper tries to analyze these functions having as a target to adapt them for application in non-financial assets portfolios. The paper uses as an example the Electricity Market to analyze and optimize a fictitious investment portfolio of a possible electric power utility. Showing that, besides being possible, which considerations must be taken and which analysis must be made to apply the Modern Portfolio Theory in the non-financial universe

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This study aimed to develop, implement and evaluate the performance of a new type of bioreactor for anaerobic treatment of wastewater using different filling materials like trickling filters post-reactor. This bioreactor has mixed characteristics of the UASB reactors and horizontal flow from the point of view of removal of BOD (Biochemical Oxygen Demand) ssed (settled solids), TS (Total Solids), SS (Suspended Solid), SD (Dissolved Solids) and turbidity. The experimental model consists of a bioreactor with a volume of 12 m³, 2/3 filled by fluidized bed and 1/3 for fixed. The fluidized bed is made of polystyrene plates used as a system percolation and compartmentalized trickling filters, where each compartment was filled with a support medium with different characteristics (gravel number 4, plastic rings of polystyrene, PET and HDPE) . In addition, the output of a filter system was installed three entries filled with activated carbon. The bioreactor was installed in private residence in the city of Igarapava-SP (20° 02'40.18"S and 47° 45'01.36" W). The system was highly efficient as the removal of organic contaminant load 92% on average reducing the BOD, a significant result when compared to other anaerobic systems. For the other parameters, the mean reduction was 96% for turbidity, 99% ssed, 67.5% ST, 57% SD and 88% of SS. As for its operation the system was capable of operating in continuous flow without the need for maintenance during the entire period of evaluation and without energy, as it operates taking advantage of the natural slope of the terrain where it is installed. The environmental impacts were minimized due to the preservation of local vegetation allowing the ecosystem to remain unchanged beyond the prototype was completely sealed preventing exhalation of odors and therefore not causing inconvenience to neighboring populations. Given these facts it was concluded that the prototype is shown to be highly feasible deployed as a new alternative for treatment of sewage in rural and urban settings (individual homes, condos, farms, ranches, etc.) Due to ease of design and operability, and sustainability at all stages of execution.

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In line with a psychology more attached to the becoming [devenir] rather than tothe essence, the goal of this paper is to ground the importance of understandingsubjectivity as a process, mainly when regarding our current discussions aboutidentity and gender. After that, we do some linkage between art and psychology. Forus, art is understood as a powerfulmanner to encourage modes of subjectivation thathave difference as an inherited relation. Lastly, we draw our attention upon somefragments of the contemporaneous artist, Mathew Barney's work-of-art (specially,Cremaster), to see how it runs through the binaries of gender boundaries andlaunches post-identity lines of subjectivation.

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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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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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A preocupação com a saúde e bem-estar atinge uma maioria de indivíduos, atualmente a busca por uma vida mais saudável faz parte do dia a dia de grande parte da população. Para alcançar uma boa qualidade de vida diversos aspectos devem ser considerados. No ambiente de trabalho a qualidade de vida tem sido afetada em consequência da utilização cada vez menor das potencialidades corporais dos indivíduos. Em contrapartida, a atividade física proporciona benefícios à saúde dentro e fora do ambiente de trabalho. Assim, o objetivo desse estudo foi identificar a associação entre qualidade de vida no trabalho e sua relação com o nível de atividade física dos funcionários administrativos da Unesp de Rio Claro - SP. A análise dessa associação pode auxiliar no enriquecimento de técnicas para intervenção e promoção da saúde, podendo aumentar a qualidade de vida no trabalho. Para a coleta dos aspectos psicossociais dos participantes foi aplicado um Questionário de Avaliação de Qualidade de Vida no Trabalho em Instituições de Ensino Superior em 136 funcionários administrativos (exceto docentes e trabalhadores de manutenção). Esse questionário avalia 7 domínios em 2 blocos: bloco 1 avaliação de desempenho, bloco 2 avaliação de frequência. Além disso, foi utilizado o questionário de Baecke adaptado por Florindo et al. (2004), para acessar o nível de atividade física. Medidas antropométricas foram coletadas para dados sobre a composição corporal dos participantes. Para coleta de dados sobre os aspectos socioeconômicos foi utilizado o questionário Critério de Classificação Econômica do Brasil proposto pela Associação Nacional de Empresas de Pesquisa (ANEP - 2003). Os resultados demonstraram que a maioria dos funcionários é Moderadamente ativa (58,1%) e na maior parte dos domínios da qualidade de vida no trabalho associados com nível de atividade física os resultados foram indesejáveis...