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Itens para a visualização no momento 11-20 of 103
Síntese e caracterização de 1,3,4-oxadiazolil-1,2,4-oxadiazóis derivados de ácidos acrílicos 3-substituídos
(Universidade Federal de Santa Maria, 2017-02-24)
A series of 1,3,4-oxadiazolyl-1,2,4-oxadiazoles was synthesized through a one-pot condensation-cyclization reaction between 3-substituted acrylic acids and 5-aryl-1,2,4-oxadiazolyl-1,2,4-oxadiazoles, and were characterized ...
A zona de convergência do atlântico sul e sua relação com a oscilação Antártica
(Universidade Federal de Santa Maria, 2017-03-03)
During the rainy season (october-march) over the southeast of Brazil there is a band of convective nebulosity that extends generally from the south of the Amazon to the southwest Atlantic ocean, known as the South Atlantic ...
Autoassociação de amidas aromáticas: abordagem supramolecular e mecanismos de cristalização
(Universidade Federal de Santa Maria, 2017-07-21)
This work presents the use of N-phenylamides as models for the study of self-association and intermolecular interactions. Obtaining the crystal of N-phenyltrifluoroacetamide allowed its diffraction and inclusion in the ...
Adsorção de cluster de ouro em materiais bidimensionais
(Universidade Federal de Santa Maria, 2017-07-31)
In this work, we studied the interaction of Au34 gold cluster with different two-dimensional
materials. Au clusters, differently of their macroscopic form, are chemically reactive. Their
use requires substrates. The ...
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 ...