Buscar
Itens para a visualização no momento 21-30 of 157
Resíduos de agrotóxicos em água potável usando SPE e determinação rápida por LC-MS/MS e GC-MS/MS
(Universidade Federal de Santa Maria, 2012-08-31)
The use of pesticides always has been associated with the effective control of pests
or invasive weeds to ensure an increase in the food production. However, the indiscriminate
use of these substances has caused the ...
Influência dos sistemas nanoestruturados na fotoestabilidade e na atividade antioxidante dos compostos fenólicos eugenol, isoeugenol e dehidrodieugenol
(Universidade Federal de Santa Maria, 2012-02-23)
There is a great interest in the study of antioxidants, mainly due to the findings on the effect of radicals in the body. These radicals are needed in many biological processes, but also may be related to processes harmful ...
BTEX: Desenvolvimento de barras de extração sortiva, determinação em efluente hospitalar e degradação por meio de fotocatálise heterogênea com TiO2 suportado em polímeros
(Universidade Federal de Santa Maria, 2012-02-24)
In this work were developed low cost bars of sorptive extraction, using commercial adhesive based on polydimethylsiloxane (PDMS) for the preconcentration and determination of benzene, toluene, ethylbenzene and xylene (BTEX) ...
Desenvolvimento de métodos de preparo de amostras para posterior determinação de As, Cd e Pb em carne e produtos cárneos
(Universidade Federal de Santa Maria, 2012-12-05)
Sample preparation methods, such as microwave-assisted wet digestion, dry ashing, wet digestion in open system and tetramethylammonium hydroxide (TMAH) solubilization were evaluated for subsequent As, Cd and Pb determination ...
Avaliação de métodos de preparo de amostras para a determinação de cloro em temperos
(Universidade Federal de Santa Maria, 2012-05-24)
In this study, sample preparation methods were evaluated for the
determination of chlorine by ion chromatography (IC) in spice samples. The
microwave-induced combustion method (MIC) was tested using certified ...
Análise de dados de RMN, deslocamentos químicos e constantes de acoplamento do sistema de hidrogênios ABX em 3,5-diaril-4,5-diidro-1H-pirazóis
(Universidade Federal de Santa Maria, 2012-09-10)
This dissertation first describes the collection of literature data among the years 2005 to 2011 for the subsequent data analysis of 1H NMR chemical shifts and coupling constants and 2JHH 3JHH with emphasis on the synthesis ...
Síntese regiosseletiva de 4-trifluormetil-2-(metiltio)-3,4-diidropirimidin-4-óis 3,6-dissubstituídos com efeito inibitório enzimático
(Universidade Federal de Santa Maria, 2012-02-27)
This work reports a simple and versatile new strategy for the regiosselective synthesis of N3-substituted 6-alkyl(aryl or heteroaryl)-4-trifluoromethyl-2-(methylthio)-3,4-dihydropyrimidin-4-ols, which enabled to establish ...
Estudo por dinâmica molecular da transição de fase estrutural de nanotubos de carbono por indução de pressão: um método ab initio
(Universidade Federal de Santa Maria, 2012-10-26)
This work aims to study the computational training of new phases of materials based on
carbon nanotubes using as precursor materials. The procedure consists in simulate bundle
formed by carbon nanotubes (NTC) (5, 5), (6, ...
Espacialização e valorização de terrenos no bairro Camobi - Santa Maria - RS
(Universidade Federal de Santa Maria, 2012-06-04)
Considering the visible process of development that Camobi presents, together with the excellent moment that real estates are presenting, this study tries to analyze the land value within the limits of Camobi, in the context ...
Sobre a utilização da história da matemática em atividades didáticas para o nono ano do ensino fundamental
(Universidade Federal de Santa Maria, 2012-01-04)
This work presents a study about an approach to the history of mathematics in
didactic activities performed by Miguel (1993). Besides, presents an analysis of three
didactic books of Mathematics, dedicated to the ninth ...