Step Index Si
Mostrando 1-7 de 7 artigos, teses e dissertações.
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1. Synthesis of Chelating Agent Free-Solid Phase Extractor (CAF-SPE) Based on New SiO2/Al2O3/SnO2 Ternary Oxide and Application for Online Preconcentration of Pb2+ Coupled with FAAS
A new online solid phase preconcentration method using the new SiO2/Al2O3/SnO2 ternary oxide (designated as SiAlSn) as chelating agent free-solid phase extractor (CAF-SPE) coupled to flame atomic absorption spectrometry (FAAS) for Pb2+ determination at trace levels in different kind of samples is proposed. The solid adsorbent has been characterized by Fourie
J. Braz. Chem. Soc.. Publicado em: 2018-06
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2. Synthesis and applications of polystyrene-block-poly(N-vinyl-2-pyrrolidone) copolymers
Abstract This work describes the synthesis and applications of amphiphilic polystyrene-block-poly(N-vinyl-2-pyrrolidone) (PS-b-PVP) copolymers as a silver and silica nanoparticle surface modification agent. The synthesis of PS-b-PVP was carried out using controlled/living radical polymerization techniques. The synthesis of the block copolymers was confirmed
Polímeros. Publicado em: 15/03/2016
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3. Indices of movement behaviour: conceptual background, effects of scale and location errors
A fundamental step in the emerging Movement Theory is the description of movement paths, and the identification of its proximate and ultimate drivers. The most common characteristic used to describe and analyze movement paths is its tortuosity, and a variety of tortuosity indices have been proposed in different theoretical or empirical contexts. Here we revi
Zoologia (Curitiba). Publicado em: 2010-10
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4. Efeito da dispersão na deslamagem e flotação de polpas de minérios hematíticos itabiríticos
Some iron ore types from Alegria and Fabrica Nova mines, mainly in the most superficial portions of their deposits, present higher hydration levels than those located in depth, being potentially generators of slimes and high alumina and phosphorus grades in the processed products. The main objective of this work was to investigate the effects of addition of
Publicado em: 2010
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5. Evolução da cárie dentária da infância à adolescência: um estudo de acompanhamento
Esse estudo objetivou analisar a evolução da cárie dentária da infância à adolescência, num período de nove anos, em um município rural de Minas Gerais, Brasil (COEP-UFMG, ETIC 447/07). Foi realizado um estudo de acompanhamento para cárie dentária, cuja linha base foi formada a partir de dados coletados em 1999. Dos 90 escolares examinados na linh
Publicado em: 2010
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6. "Influência do volume de adesivo e das ciclagens térmica e mecânica na resistência de união resina-dentina" / Influence of the adhesive volume, thermal and mechanical load cycling on the resin-dentin bond strength
Dentin bonding interfaces with increased capacity of stress dissipation are able to prevent failures due to polymerization contraction, thermal and mechanical stresses. This would be obtained by increasing adhesive layer thickness. The purpose of this study was to compare the resin-dentin microtensile bond strengths (BS) of two adhesive systems (AS) applied
Publicado em: 2005
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7. ESTUDIO DE LA DISPERSIÓN CROMÁICA Y EFECTOS NO LINEALES EN FIBRAS DE DISPERSIÓN DESPLAZADA / STUDY OF CHROMATIC DISPERSION AND NONLINEAR EFFECTS IN SHIFTED DISPERSION FIBER OPTIC SYSTEM / ESTUDO DA DISPERSÃO CROMÁTICA E EFEITOS NÃO LINEARES EM FIBRAS DE DISPERSÃO DESLOCADA
This work presents a study on the mathematical determination of the total chromatic dispersion, zero dispersion wavelength and nonlinear optical effects in dispersion shifted (DS) fiber optic system. A methodology to determine the chromatic dispersion and zero dispersion wavelength is proposed using the equivalent step index model and the similarity of the t
Publicado em: 2001