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Inversores ZCZVT com acoplamento magnético: síntese e análise
(Universidade Federal de Santa Maria, 2008-03-10)
This Ph. D. Thesis presents a in deep study of the mechanism of resonant transition soft-switching techniques. By means of the principles that rules the PWM resonant transition converters, a novel tool for analysis and ...
Caracterização física e biológica do solo após aplicação de herbicidas em plantios de acácia-negra (Acacia mearnsii De Wild.) no Rio Grande do Sul
(Universidade Federal de Santa Maria, 2008-01-25)
The study of soil quality biological indicators in areas classified as forest production units is important to understand the ecological processes that occur in these systems. Monitoring the soil fauna in modified environments, ...
Algoritmo de localização de nodos para redes de sensores móveis
(Universidade Federal de Santa Maria, 2009-12-21)
This thesis presents contributions to node localization in mobile sensor networks. Considering the importance of localization algorithms in identifying the location of an
event in order to better determine the action to ...
Utilização de conversores eletrônicos que alimentam leds de alto brilho na aplicação em tecido humano e sua interação terapêutica
(Universidade Federal de Santa Maria, 2009-08-31)
This paper presents a study on the application of high-brightness LED (Light Emitting Diode)to health care. The LEDs are supplied by electronic converters, proposed in order to analyze the light emitted by the LEDs and ...
Processamento de sinais analógicos amostrados utilizando técnicas de chaveamento a capacitor e a corrente aplicados à conversão AD sigma delta
(Universidade Federal de Santa Maria, 2009-08-27)
Circuits for sampling and retention of analogue signals are commonly implemented with techniques such as switched capacitors (SC). SC circuits employing the storage of charge in a linear capacitor to represent a signal in ...
Utilização avançada da capacidade excedente de sistemas de transmissão CCAT para produção de oxigênio e hidrogênio
(Universidade Federal de Santa Maria, 2008-04-02)
This PhD thesis discusses the use of the power plant capacity in HVDC transmission systems during inactive periods of the main converters to feed local loads, aiming at a better AC power quality and DC transmission. The ...
População de plantas e a ocorrência de moléstias no feijoeiro comum
(Universidade Federal de Santa Maria, 2005-01-26)
Tree experiments were conducted in Santa Maria end Constantina (State of Rio Grande do Sul- Brazil), objecting to determine the best plant population of type II e III of common bean grown in the season and latter season, ...
Doses e épocas de aplicação de nitrogênio na suscetibilidade do arroz a temperatura baixa na fase reprodutiva
(Universidade Federal de Santa Maria, 2008-06-12)
The release of new cultivars and improvement in management practices is necessary to examine the time and nitrogen (N) rates to be applied to obtain high yields. Also there is little information about the effect of the N ...
Disponibilidade de formas de fósforo do solo às plantas
(Universidade Federal de Santa Maria, 2003-02-27)
The soil phosphorus availability depends on a dynamic process and it involves its different forms in the soil. The bond energy of phosphorus and its ligants drives the desorption phenomenon and lability of the different ...
Indução pós-colheita da síntese de resveratrol e de resistência de frutos a podridões
(Universidade Federal de Santa Maria, 2008-02-27)
The objectives of this work were divided in two experiments phases. In the first phase, it was
studied the presence of trans-resveratrol in temperate climate fruits and the variation of their
concentration in these fruits ...