Buscar
Itens para a visualização no momento 71-76 of 76
Estudo de métodos empregando HPLC-DAD e LC-MS/MS para a determinação de resíduos de herbicidas em água e solo do cultivo de arroz irrigado
(Universidade Federal de Santa Maria, 2007-12-20)
The irrigated agriculture of Rio Grande do Sul (RS) it is responsible for about 50% of the Brazilian production of rice, and the success of the production depends, generally, of the application of chemical substances. Many ...
Estudo de métodos empregando extração em fase sólida e análise por HPLC-DAD e GC-ECD para a determinação de resíduos de pesticidas em águas e da degradação a campo
(Universidade Federal de Santa Maria, 2007-02-26)
The culture of irrigated rice generates a great impact to the environment, both in the amount and the quality of waters. In this study, a methodology was developed and validated for the determination, in waters, of residues ...
Bioatividade de extratos vegetais no controle de Sitophilus oryzae (Linné, 1763) em arroz
(Universidade Federal de Santa Maria, 2007-09-19)
The continuous growth of the world population, intensive competition among humans and plant pests for the same food sources, the resistence to existing inseticides by some insects and the persistence of residues in the ...
A leitura no livro didático de língua portuguesa: outras formas de dizer o mesmo
(Universidade Federal de Santa Maria, 2007-11-19)
The object of our research is the text books of Portuguese language used in the fundamental level of school, adopted by public schools in Brazil which are representatives of different decades covering approximately third ...
Princípio de integração de circuitos de auxílio à comutação: o estudo do caso ZVT
(Universidade Federal de Santa Maria, 2007-12-10)
The main contribution of this Thesis is the proposition of the integration concept of auxiliary commutation circuits applied to systems with several power conversion stages. Trough this concept, the reactive energy resulting ...
Influência das características físicas do solo nas perdas de água por escoamento superficial no Sul do Brasil e Uruguai
(Universidade Federal de Santa Maria, 2007-02-28)
The objective of this work was to modeling runoff in soils with different physical characteristics, with three simulated rainfall intensities (30, 60 and 120 mm h-1) in Rio Grande do Sul and Uruguay. For simulated rainfall ...