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Itens para a visualização no momento 91-96 of 96
Sistemas eletrônicos para iluminação de exteriores empregando diodos emissores de luz (LEDs) alimentados pela rede elétrica e por baterias
(Universidade Federal de Santa Maria, 2012-11-30)
This work presents a design methodology and analysis of electronic circuits applied to
outdoor lighting systems using light emitting diodes (LEDs). The goal of topologies developed
here is to supply the LEDs from the ...
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 ...
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 ...
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 ...
Propriedades mecânicas de concretos com diferentes cimentos Portland e com cinza de casca de arroz natural e moída
(Universidade Federal de Santa Maria, 2012-06-22)
Due to high rates of emissions of carbon dioxide released in cement production, an
alternative to minimize this pollution is the use of rice husk ash in concrete as partial cement
replacement. This research aims to ...