Refraction
Mostrando 13-24 de 226 artigos, teses e dissertações.
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13. Reflection and Refraction of Waves at the Boundary of a Non-Viscous Porous Solid Saturated with Single Fluid and a Porous Solid Saturated with Two Immiscible Fluids
Abstract The phenomenon of reflection and refraction is studied at the welded interface between two different porous solids. One is saturated with single non-viscous fluid and other is saturated with two immiscible viscous fluids. The incidence of Pf, Ps or SV wave through porous solid saturated with non-viscous fluid results in the three reflected waves and
Lat. Am. j. solids struct.. Publicado em: 2016-07
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14. Comparison between refraction measured by Spot Vision ScreeningTM and subjective clinical refractometry
OBJECTIVE: The purpose of this study was to evaluate the accuracy of Spot Vision ScreeningTM as an autorefractor by comparing refraction measurements to subjective clinical refractometry results in children and adult patients. METHODS: One-hundred and thirty-four eyes of 134 patients were submitted to refractometry by Spot and clinical refractometry under
Clinics. Publicado em: 2016-02
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15. Reflection/refraction at the interface of an elastic solid and a partially saturated porous solid containing liquid filled bound pores and a connected pore space saturated by two-phase fluid
Abstract The phenomena of reflection and refraction of plane waves incident obliquely at a plane interface between uniform elastic solid half-space and porous solid containing liquid filled bound pores and two-phase fluid in connected pores has been analyzed. The amplitude ratios of the reflected and refracted waves to that of the incident wave are calculate
Lat. Am. j. solids struct.. Publicado em: 2015-10
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16. Use of Lead (II) Sulfide Nanoparticles as Stabilizer for PMMA Exposed to Gamma Irradiation
Lead (II) sulfide (PbS) were synthesized by sonochemical method and crystals with cubic structure exhibit aggregated nanoparticles with size in the range of 50-100 nm. Commercial Poly(methyl methacrylate) (PMMA) containing the PbS nanoparticles (PbS-NP) exposed to gamma irradiation were investigated and both the viscosity-average molar mass (Mv) and degradat
Mat. Res.. Publicado em: 2015-04
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17. Propagation of plane waves at the interface of an elastic solid half-space and a microstretch thermoelastic diffusion solid half-space
The problem of reflection and refraction phenomenon due to plane waves incident obliquely at a plane interface between uniform elastic solid half-space and microstretch thermoelastic diffusion solid half-space has been studied. It is found that the amplitude ratios of various reflected and refracted waves are functions of angle of incidence, frequency of inc
Lat. Am. j. solids struct.. Publicado em: 2013-11
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18. De Quarto de despejo a Le dépotoir, o processo de refração na reescrita do diário de Carolina Maria de Jesus / From Quarto de Despejo to Le Dépotoir, the refraction process on Carolina Maria de Jesuss diarys rewriting
Quarto de Despejo, diário escrito por Carolina Maria de Jesus, foi lido e discutido em treze idiomas, dentre eles o francês. A história da mulher negra e semianalfabeta que viveu na favela do Canindé, em São Paulo, foi divulgada pela primeira vez na França em 1962 sob o título de Le Dépotoir. Publicado no Brasil em 1960, após revisão do jornalista
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/10/2012
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19. Problemática da correção óptica em escolares: acesso, comparecimento, necessidade e uso de óculos / Optical correction issue in schoolchildren: access, attendance, need and use of spectacles
INTRODUÇÃO: A falta da correção óptica recentemente foi reconhecida como importante causa de baixa visão e parece ser um problema fácil de ser resolvido com o uso de óculos. No entanto, a falta da correção óptica é um problema complexo do seu diagnóstico ao tratamento, envolvendo a procura e alcance da assistência médica, além da confecção
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/08/2011
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20. Acoplamento de técnicas espectrométricas com métodos quimiométricos de classificação e calibração multivariada em alimentos / Coupling spectrometric techniques with chemometric methods for classification and multivariate calibration in food
This research work describes three studies of chemometric methods employed for the classification and characterization of edible oils and its quality parameters through Fourier Transform mid infrared spectroscopy and near infrared spectroscopy, and for the monitoring the oxidative stability and quality of yogurt using fluorescence spectroscopy . The first an
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/05/2011
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21. Estudo de viabilidade de integração de micro-lâmpadas incandescentes com filtros interferenciais. / Study of viability of integration of incandescent micro-lamps with interferometric filters.
In the present work was realized a study of the viability of integrating two optical devices: incandescent micro-lamps and interferometric filters with the intention of obtaining a single device with specific characteristics. The fabrication of these optical devices was made using dielectric materials, obtained by plasma-enhanced chemical vapor deposition (P
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/04/2011
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22. Propagação de transitórios de alta frequência e o efeito de múltiplas reflexões em redes coletoras de parques eólicos marítimos / High frequency transients propagation and multiple reflections effect in collection grids for offshore wind parks
Neste trabalho a propagação de transitórios de tensão dentro de uma rede coletora de parques eólicos marítimos foi estudada. Foram analisados especificamente os transitórios de tensão originados durante a energização do parque eólico, e foi modelado o efeito dos múltiplos pontos de reflexão na composição da forma de onda da sobretensão transi
Publicado em: 2011
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23. Metamaterial inspired improved antennas and circuits
Metamaterials exhibiting negative refraction have attracted a great amount of attention in recent years mostly due to their exquisite electromagnetic properties. These materials are artificial structures that exhibit characteristics not found in nature. It is possible to obtain a metamaterial by combining artificial structures periodically. We investigated t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/12/2010
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24. Alterações físico-químicas do óleo de palma na pré-fritura contínua de produtos cárneos empanados de frango - tipo "snacks"
The lack of time for the preparation of food has caused an increase in consumption of fried foods that are a rapid alternative of preparation that promotes sensory properties highly appreciated by consumers. The continuous frying method is used by the industrial market for pre frying procedures. Palm oil has high oxidative stability by having almost equivale
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/10/2010