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Itens para a visualização no momento 81-90 of 96
Modelagem e controle de um reator eletrônico para lâmpadas HPS baseado na conexão diferencial de conversores CC
(Universidade Federal de Santa Maria, 2012-02-28)
This paper presents the development of an electronic ballast for high intensity discharge lamps, using the differential connection technique applied to Flyback converters. The power factor correction stage was implemented ...
Estudo da viabilidade técnica da aplicação de solo saprolítico melhorado com cimento como base de pavimento de baixo custo
(Universidade Federal de Santa Maria, 2012-12-28)
When analyzing the road network of the country, it is noticed that the
extension of paved roads is very small. This fact is mainly due to reduced public
resources and the high costs of traditional materials utilized in ...
Projeto e análise da eficiência de um sistema solar misto de aquecimento de água e de condicionamento térmico de edificações para Santa Maria - RS
(Universidade Federal de Santa Maria, 2012-03-07)
The use of solar energy in buildings, to improve the comfort environmental
conditions implies in the reduction of energy consumption. Since this is a clean,
renewable and abundant energy, the use of design strategies ...
Síntese e caracterização do composto TiO2 dopado com nitrogênio e estudo de sua atividade fotocatalítica sob luz visível e irradiação solar
(Universidade Federal de Santa Maria, 2012-03-02)
In this work was carried out the catalyst synthesis TiO2 doped with nitrogen by sol-gel method, followed by calcination step. Were used three different calcination temperatures, 400, 450 and 500 ° C, while the other synthesis ...
Monitoramento da flutuação dos níveis de água em aquíferos freáticos para avaliação do potencial de recarga em área de afloramento do Sistema Aquífero Guarani em Cacequi - RS
(Universidade Federal de Santa Maria, 2012-03-15)
This research aimed to estimate the recharge and groundwater water table fluctuation in areas with withdrawals of groundwater and surface water related to the variation of groundwater levels and rainfall events. The two ...
Análise de torres de LT considerando a interação solo-estrutura
(Universidade Federal de Santa Maria, 2012-03-05)
The mechanical model usually adopted in the design of transmission lines (TL)
latticed steel towers is very simple, using spatial truss and frame elements, and
solved by a linear static or non-linear geometric analysis. ...
Metodologia para despacho de fontes de GD a biogás em redes de distribuição utilizando lógica fuzzy
(Universidade Federal de Santa Maria, 2012-03-19)
The aim of this work is determine the most appropriated period for connection of a
particular generation source fueled by biogas on a distribution network. The biogas is
produced through anaerobic reactions that occur ...
Um modelo de gestão para prevenção da má utilização da web
(Universidade Federal de Santa Maria, 2012-03-05)
Currently, the use of the Web in the workplace has provided new business models, reduced
communication cost and agility in business processes. However, some side effects also arise,
since it is estimated that 30-40% of ...
Algoritmo de alto desempenho para proteção numérica de linhas de transmissão imune a oscilações de potência
(Universidade Federal de Santa Maria, 2012-05-04)
This Doctoral Thesis proposes a new methodology for transmission line protection
tolerant to power swings. The algorithm developed has the ability to detect, classify and
locate all fault types with and without power ...
Avaliação das patologias e da biodeterioração na Biblioteca Central da UFSM
(Universidade Federal de Santa Maria, 2012-08-30)
Agents climatic, biological and human action are the main responsible for deterioration of historic buildings, thus the growing concern with the preservation and maintenance of these buildings. This study was conducted at ...