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Itens para a visualização no momento 21-30 of 143
Características médias da circulação atmosférica em eventos de neve no sul do Brasil
(Universidade Federal de Santa Maria, 2017-06-19)
In this work the mean behavior of atmosphere preceding and during snowfall events was
investigated. Furthermore, anomalous fields correlated to snowfall events related to an atmospheric
base state were quantified. To ...
Síntese e estereoquímica de isoxazóis espiro-tetracíclicos trifluormetil substituídos
(Universidade Federal de Santa Maria, 2017-02-23)
The present dissertation initially describes methodologies for the synthesis of five 3-(trifluoromethyl)-3,3a-dihydrospiro[chromeno[4,3-c]isoxazole-4,1'-cycloalkan]-3-ols (7) in 65 – 84 % yields, where the spirocarbocyclic ...
Variabilidade sazonal e controle biofísico da evapotranspiração na vegetação do bioma Pampa
(Universidade Federal de Santa Maria, 2017-10-17)
Evapotranspiration (ET) is an important component that connects water and energy cycles in terrestrial ecosystems. Understanding how ET changes with environmental factors is critical to a better understanding of ecological ...
Determinação dos fluxos turbulentos de calor e momentum entre o oceano e a atmosfera na região sudoeste do oceano Atlântico
(Universidade Federal de Santa Maria, 2017-08-31)
The knowledge about the mass and energy fluxes between the atmosphere and the ocean at different
regions of the planet is of utmost importance for the improvement of the weather and climate
predictions. This is mainly ...
Síntese e caracterização de complexos de rênio e tecnécio contendo ligantes arilcalcogenolatos (Se, Te)
(Universidade Federal de Santa Maria, 2017-12-06)
Rhenium and technetium coordination chemistry containing arylthiolate ligands are long known in the
literature. However, there is a limited understanding regarding the correlates containing heavier
chalcogens (Se and ...
Estrutura dinâmica e termodinâmica da zona de convergência do Atlântico Sul e sua relação com a oscilação Madden e Jullian
(Universidade Federal de Santa Maria, 2017-06-14)
In the southern summer period over South America, an important system is one of the main modulators of the rainfall regime of the working regions, the SACZ. This system is a nebulosity zone that extends from the Amazon ...
Estudo molecular e supramolecular de complexos triazenidos com metais de transição: uma abordagem voltada à engenharia de cristais
(Universidade Federal de Santa Maria, 2017-09-15)
This work shows the synthesis of unpublished Zn(II), Cd(II) and Pd(II) complexes with
bis-cated triazene molecules, including macrocycles. Together these compounds, a series of
symmetrical ortho-halogenated single-catenad ...
Utilização de algoritmo genético para a determinação da estabilidade de aglomerados atômicos e as aplicações destes com grafeno
(Universidade Federal de Santa Maria, 2017-01-31)
In this thesis we propose a improvement of the Genetic Algorithm (GA) method that is used to
search the stability of geometry of atomic clusters. The proposed improvements consist by introducing
two new operators: the ...
Síntese de 4-(1-fenil-5-trifluormetil-1h-pirazol-4-il)-1h-1,2,3-triazóis promovida por dialquil biaril fosfinas e catálise metálica
(Universidade Federal de Santa Maria, 2017-08-11)
The present dissertation describes the development of a three-step, one-pot methodology, involving the sequential reactions of Sonogashira cross-coupling, deprotection of terminal alkyne (removal of trimethylsilane group), ...
Classificação de singularidades semi- hiperbólicas e nilpotentes de campos planares analíticos
(Universidade Federal de Santa Maria, 2017-07-12)
In this work, we present some results of Qualitative Theory of Planar Ordinary Differential Equations employed in the investigation of the behavior of solutions in the neighborhood of semi-hyperbolic and nilpotent singularities.