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Itens para a visualização no momento 21-30 of 131
Síntese de 1-aril-4-[(dimetilamino)metileno] pirrolidino-2,3,5-trionas utilizando irradiação de micro-ondas
(Universidade Federal de Santa Maria, 2011-02-24)
The synthesis of a series of 1-aryl-4-[(dimethylamino)methylene] pyrrolidine-
2,3,5-trione from the cyclocondensation reaction between b-enaminodiketone
[Cl3C(O)C(=CHNMe2)C(O)CO2Et] and aniline derivatives [R = Ph, 3-Me-C6H4, ...
Síntese de β-Calcogenoaminas quirais via abertura regiosseletiva de Aziridinas em Líquidos Iônicos.
(Universidade Federal de Santa Maria, 2011-07-29)
The present work report the synthesis of β-chalcogen amino compounds derived from L-aminoacids. The desired products were obtained in a short reaction time, with high yields using a simple and environmentally friendly ...
Desenvolvimento de sistema em fluxo empregando ultrassom para remoção de enxofre de óleo diesel
(Universidade Federal de Santa Maria, 2011-02-18)
In this work, the development of a continuous flow process for sulfur removal
from diesel oil is proposed. The process is based on the application of ultrasonic
energy for increasing the oxidation reaction rate of sulfur ...
Estudo teórico da interacção de oxigênio com nanotubos de BC2N
(Universidade Federal de Santa Maria, 2011-04-19)
Using first principles calculations based on the Density Functional Theory (DFT)
with spin polarization and norm conserving fully separable pseudopotentials, we have
studied the structural and electronic properties of the ...
Estudo da transição cristalográfica em filme fino de VO2 por difração de raios-x
(Universidade Federal de Santa Maria, 2011-03-28)
In one sample, X-Ray diffractions have been measured as a function of the temperature, in
order to follow the crystallographic transition experienced by VO2 near 68ºC. The results have
been analysed with the aide of a ...
Crescimento de filmes finos de ni81fe19 para aplicações envolvendo magnetorresistência anisotrópica
(Universidade Federal de Santa Maria, 2011-05-13)
Anisotropic magnetoresistance (AMR) consists in the change of the resistivity of a ferromagnetic metal as a function of the angle between the current and the magnetization, what makes AMR-based sensors promising to measure ...
Aplicação de ultrassom para remoção de enxofre e de nitrogênio do óleo diesel: avaliação de parâmetros do processo e determinação de enxofre e de nitrogênio por técnicas espectrométricas e cromatográficas
(Universidade Federal de Santa Maria, 2011-09-29)
In the present work, the ultrasound assisted oxidation of sulfur and nitrogen compounds present in diesel fuel was investigated. The oxidized compounds are more polar than their original forms and can be removed from oil ...
Identificação de fatores de risco para o baixo peso ao nascer - uma análise de regressao logística
(Universidade Federal de Santa Maria, 2011-12-09)
OBJECTIVE: To identify risk factors for low birth weight singleton pregnancies by means of logistic regression analysis with binary outcomes, using data from the Information System on Live Births - SINASC RS in 2008. ...
O ensino da estatística no desenvolvimento da criticidade de alunos de uma escola do ensino fundamental no municipio de Montenegro, RS
(Universidade Federal de Santa Maria, 2011-02-04)
In this study, it is developed the problem situation, theory and practice related to the
construction of the students’ critical sense when learning Statistics, as to the
curriculum of mathematical content as well as to ...
Caracterização dos turistas de Santa Maria, RS
(Universidade Federal de Santa Maria, 2011-07-19)
The tourism activity is constantly growing and has a prominent position in the global
economy. The competition between touristic destinations creates the need for researches that
show the characteristics, the demand and ...