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Itens para a visualização no momento 1191-1200 of 1213
Conversor flyback modificado para alimentação de lâmpadas de descarga em alta pressão: projeto, modelagem e controle
(Universidade Federal de Santa Maria, 2012-03-01)
This dissertation consists of the design of an electronic ballast to drive high pressure discharge (HID) lamps, focusing on low power applcations. An innovative modified yback conveter is proposed as main part of an ...
Avaliação do comportamento de estacas escavadas moldadas com resíduos de construção civil
(Universidade Federal de Santa Maria, 2012-06-29)
The generation from residues of civil construction brings serious implications for society and
the environment. Ahead of this, have sought alternative to the use of such residues in
engineering with a view to contributing ...
Previsão de consumo de energia elétrica e elaboração de modelos de otimização em cooperativa de eletrificação rural
(Universidade Federal de Santa Maria, 2011-08-30)
This dissertation aims to build a set of tools based on mathematical models to assist a rural
electrification cooperative in taking strategic decisions on investing in electrical generation in
face of erratic and ...
Determinação experimental e numérica da redução sonora aérea em paredes de alvenaria utilizadas em habitações
(Universidade Federal de Santa Maria, 2011-03-15)
In this research some kinds of masonry walls have been used as internal divisions in
three Brazilian dwelling buildings to determine the airborne sound reduction, by
experimental tests in field and computer simulations. ...
Proposta de modelo de diagnóstico da competitividade de agroindústrias produtoras de alimentos de origem animal
(Universidade Federal de Santa Maria, 2012-04-02)
The Brazilian agribusiness segment is experiencing a unique moment in relation to opportunities for expansion and consolidation. However, while it expands, exposes weaknesses that have led the segment s companies less ...
Gerador de indução com excitação estática, filtro ativo e armazenamento de energia para sistemas eólicos isolados
(Universidade Federal de Santa Maria, 2013-03-01)
The growing global demand for electricity, increasing scarcity of the conventional
energy sources and the need to reduce environmental impacts contributed to the pronounced
development of new technologies based on clean ...
Estudo da carbonatação natural de concretos com pozolanas: monitoramento em longo prazo e análise da microestrutura
(Universidade Federal de Santa Maria, 2012-08-31)
The carbonation in concrete is caused by the penetration of environmental carbonic
anhydride (CO2) in concrete by diffusion, being considered one of more important
structures pathologies. It occurs naturally in concrete ...
Desenvolvimento de uma topologia híbrida a três fios para regulação de tensão aplicada em microcentrais hidrelétricas
(Universidade Federal de Santa Maria, 2013-01-25)
This dissertation presents the study of a three-wire hibrid topology for voltage
regulation for micro-hydroelectric generators that use self-excited induction in isolated
operation. Initially, a literature review is ...
Produção mais limpa em um frigorífico de aves: aplicação da ferramenta SWOT
(Universidade Federal de Santa Maria, 2013-02-22)
The constant search for improving the quality of life has gained importance worldwide. In this point of view, much emphasis is given to the production of healthier foods, in which chicken comes up as the most important ...
Sistemas eletrônicos de iluminação baseados nos conversores CA/CA
(Universidade Federal de Santa Maria, 2011-08-23)
This thesis proposes to improve the efficiency of public illumination systems by means of AC chopper based power converters. A comparative study of high performance AC/AC converters feeding high pressure sodium lamps on ...