Optical Absortion
Mostrando 1-4 de 4 artigos, teses e dissertações.
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1. Propriedades eletrônicas e estruturais de nanotubos de dióxido de titânio por primeiros princípios
In this work, we perform first-principles calculations based on the Density Functional Theory (DFT) to study structural and electronic properties of TiO2 nanotubes. Firstly, we address structural aspects. For this purpose we consider a model in which the nanotubes are obtained by rolling up layers of anatase TiO2 oriented in the (001) direction. The stabilit
Publicado em: 2007
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2. Aerosol Source Apportionment study in São Paulo city / A Determinação Quantitativa de Fontes de Material Particulado na Atmosfera da Cidade de São Paulo
A região metropolitana de São Paulo apresenta problemas crônicos de poluição atmosférica. A poluição atmosférica em centros urbanos é comprovadamente prejudicial à saúde da população exposta, o que gera uma preocupação mundial acerca deste tema. Com o intuito de identificar e quantificar a contribuição de fontes e a importância das emissõ
Publicado em: 1999
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3. Analysis of the efficiency from visible-light sources used to polimerize odontological resins. / Estudo da eficiência de aparelhos para fotopolimerizar resinas odontológicas.
In this work, five photopolymerizators was characterized, Visilux 2, Resilux, Fibralux, Translux III and Primelite. Initially the emission specter from five light sources was obtained with a monochromator, and to these specters was adjusted gaussians functions. The better adjustments was obtained with a sum of gaussian functions, originating a caracteristic
Publicado em: 1993
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4. Caracterização de vidros e vitro-cerâmicas com composição 2Na2O1CaO3SiO2 / Characterization of glasses and glass-ceramics with composition 2Na2O1CaO3SiO2
Glass with composition 2Na2O1CaO3SiO2, undergoes homogeneous crystal nucleation between 450 and 56OoC. The nuclei are essentially spherical and presumable have the same composition as the glass matrix. Measuriments of density, X-ray diffraction, thermal analysis by differential scanning calorimetry (DSC), ultrasonics by pulse-echo method, optical absorption,
Publicado em: 1990