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Mostrando ítems 81-90 de 118
Estudo das etapas sintéticas de complexos mistos de ftalocianinas de zinco e cobalto com tetrafenilporfirina de zinco
(Universidade Federal de São Carlos, 2004-09-13)
A systematic study of synthetic steps in the
formation of phthalocyanine and porphyrin mixed complexes, having pyrazine as
bridged ligand is described in this work. Two mixed complexes series were
obtained, keeping ...
Estudo de pós cerâmicos de PbTiO3 utilizando-se o método dos precursores poliméricos.
(Universidade Federal de São Carlos, 2000-11-30)
THE STUDY OF PbTiO3 (PT) CERAMIC POWDERS USING THE POLYMERIC PRECURSOR METHOD was started by the preparation of a precursor solution of metallic cations. Citric acid was used as quelation agent and ethylene glycol as ...
Determinação de As, Sb e Se em material agronômico por espectrometria de emissão óptica acoplada a plasma induzido com geração de hidretos (HG-ICP-OES).
(Universidade Federal de São Carlos, 2005-04-07)
With the objective to attain maximum productivity with small costs, organic and inorganic chemical parameters are used to evaluate and monitoring crops and animals development. Inorganic amounts in agronomic
samples have ...
Preparação e caracterização de compósitos de polipirrol (LiMn2O2)/ fibra de carbono para catodos em baterias secundárias.
(Universidade Federal de São Carlos, 2003-08-19)
Composites of polypyrrol (Ppy) and LiMn2O4 were
synthesized chronoamperometrically at 0.8 V (vs. ECS) in 0.1 mol.L-1 LiClO4 /acetonitrile (2% H2O added) electrolyte containing 0.1 mol.L-1 of the pyrrol monomer, on carbon ...
Desenvolvimento de procedimentos de digestão para óleos lubrificantes.
(Universidade Federal de São Carlos, 2005-04-29)
In this work it was developed a digestion procedure for lubricant oil based on gradual addition of sample aliquots on hot and concentrated oxidant acids. The element concentrations in the diluted digestates were determined ...
Estudo teórico do espalhamento de elétrons pelos radicais livres OH e NH.
(Universidade Federal de São Carlos, 2003-11-28)
Recently, interest on studies of electron scattering by highly-reactive free radicals has grown mostly because their participation on many important processes in several fields such astrophysics, biological and earth s ...
Estudos microgravimétricos da deposição de cobre sobre eletrodos de cromo passivado.
(Universidade Federal de São Carlos, 2002-11-29)
Recently were obtained in our laboratory results indicating that Cu deposition on
Cr2O3 happens in two steps: at the first one, there is the deposition of an amount
smaller than one Cu monolayer, and at the second one there ...
Determinação de polifenóis totais utilizando sistemas de análise por injeção em fluxo.
(Universidade Federal de São Carlos, 2004-02-17)
In this dissertation, three flow injection analysis methods for total polyphenol
determination in tea and acacia s tannins commercial extracts were developed. The first method is based on the reaction between the polyphenol ...
Qualidade da água e fluxos de nutrientes na interface sedimento-água nas represas do Rio Tietê.
(Universidade Federal de São Carlos, 2003-04-30)
The first Law of Fick in one dimension was utilized for the calculation of those fluxes.
In this work was calculated the concentrations of the following chemical species: nitrate, nitrite, ammonium, total nitrogen, ...
O envolvimento do aluno no processo de ensino - aprendizagem durante a realização de atividades experimentais.
(Universidade Federal de São Carlos, 2005-06-10)
This work had as an objective to identify the motivation level of the students who belong to three public grade schools in the city of São Carlos with different socio-economical
realities for the chemistry learning. ...