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Itens para a visualização no momento 171-180 of 185
Emprego de ultrassom para a oxidação e separação de compostos orgânicos sulfurados em hidrocarbonetos e determinação de enxofre por técnicas espectrométricas e cromatográficas
(Universidade Federal de Santa Maria, 2009-04-13)
In this work, a process based on ultrasonic energy for sulfur removal from
petroleum fractions was proposed. The process combines ultrasonic energy and a
peroxyacid reagent in order to achieve the required sulfur content ...
Estudo de reações de N-alquilação de pirimidin-2-onas: síntese de novos análogos nucleosídicos modificados
(Universidade Federal de Santa Maria, 2008-01-15)
This work presents a study of the N-alkylation reactions of 4-
(trichloromethyl)pyrimidin-2(1H)-one(2), 5-bromo-4-methoxy-4-(trichloromethyl)-3,4-dihydropyrimidin-2-(1H)-one (7), 4-methoxy-4-(trichloromethyl)-3,4-dihydr ...
Síntese de 3-trifluoracetilpirróis N-substituídos
(Universidade Federal de Santa Maria, 2008-02-18)
This work presents a new, simple and versatile one-pot strategy for the synthesis of new N-substituted 3-trifluoroacetyl-pyrroles. These compounds were obtained by the reaction of 3-trifluoroacetyl-4,5-dihydrofuran with ...
Avaliação de processos de remoção química de fósforo de efluente de suinocultura
(Universidade Federal de Santa Maria, 2008-01-17)
The increasing of swine growing in confinement area have forced the application of new technologies to increase production and costs reduction. Large amount of manure containing pollutants is generated as a consequence. ...
Emprego de multiatomizador de quartzo para a minimização de interferências e determinação de arsênio por HG AAS em antimoniais pentavalentes
(Universidade Federal de Santa Maria, 2008-03-06)
A systematic study was made to evaluate the interference of hydride forming elements in conventional quartz tube atomizers as well as to study the performance of
multiatomizer of quartz (MMQTA) for minimization of these ...
Síntese e atividade antimicrobiana de 3-trifluormetil(oxo)-pirimido[1,2-a]benzimidazóis
(Universidade Federal de Santa Maria, 2005-02-15)
This work presents the synthesis of a series of 3-trifluormethyl(oxo)-pyrimido[1,2-a]benzimidazoles from the cyclocondensation reaction between 2-amino-1H-benzimidazol and 4-alcoxy-1,1,1-trihalo-3-alquen-2-ones.
The ...
Emprego de oxigênio e peróxido de hidrogênio como auxiliares na decomposição de amostras biológicas por via úmida assistida por radiação micro-ondas
(Universidade Federal de Santa Maria, 2012-07-02)
In the present work it was investigated the possibility of using diluted HNO3 solutions for digestion of biological samples (milk powder and bovine liver) by microwave-assisted wet digestion. The possibility of use O2 and ...
Cinética de craqueamento de hidrocarbonetos (C8) utilizando micropirólise em tubo de vidro selado aplicação em modelagem geoquímica
(Universidade Federal de Santa Maria, 2010-12-07)
One of the most fundamental problems in petroleum systems modeling, related to Oil
Exploration, is to determine the limits of space and time of hydrocarbon generation in
sedimentary basins. The aim of this study is to ...
Síntese one pot de 1,3,4-oxadiazóis derivados de L-aminoácidos e benzoil-hidrazidas
(Universidade Federal de Santa Maria, 2012-07-20)
In the following work, a range of 1,3,4-oxadiazles 2,5-disubstituted 3 was
prepared, using a one pot approach, from L-amino acids 1(a-e) and 2-benzoylhydrazides,
using POCl3 as dehydrating agent.
The study involved the ...
Emprego DAETV-ICP OES para a determinação de impurezas inorgânicas em produtos farmacêuticos
(Universidade Federal de Santa Maria, 2013-03-01)
In this study a method for As, Cd, Cr, Cu, Mn, Mo, Ni, Pb, Pd, Pt, Rh, Ru and V determination in pharmaceuticals products by electrothermal vaporization inductively coupled plasma optical emission spectrometry (ETV-ICP ...