Optic Electronic
Mostrando 1-12 de 30 artigos, teses e dissertações.
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1. Multifocal versus monofocal intraocular lenses after cataract extraction
BACKGROUND: Good unaided distance visual acuity is now a realistic expectation following cataract surgery and intraocular lens (IOL) implantation. Near vision, however, still requires additional refractive power, usually in the form of reading gla
Sao Paulo Med. J.. Publicado em: 2015-01
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2. Effect of Fiber Optic Chromatic Dispersion on the Performance of Analog Optical Link with External Modulation Aiming at Aerospace Applications
ABSTRACT: This paper addresses the subject of fiber optic chromatic dispersion effect on the performance of analog optical link with dual-drive electro-optic Mach-Zehnder modulator, aiming at aerospace applications. Thus, a direct detection link model that emphasizes both the modulator electronic drive and the dispersion characteristic of a linear optical fi
J. Aerosp. Technol. Manag.. Publicado em: 2013-06
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3. Estudo das propriedades eletro ópticas de filmes finos de nitreto de índio nanoestruturado e de sua aplicação em dispositivos fotônicos e opto eletrônicos. / Study of electro optic properties of nanostructured indium nitride thin films and aplication in opto electronics and photonics devices.
O nitreto de índio (InN) e seus derivados (como o oxi-nitreto de índio) são materiais com alta potencialidade de aplicações em dispositivos optoeletrônicos devido às suas propriedades ópticas e eletrônicas. Para o InN foi obtido originalmente um band gap em torno de 1,9 eV e, apesar deste valor aparecer com freqüência na literatura, têm se obtido
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/08/2011
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4. Vidros de germanato com nanopartículas metálicas e semicondutoras dopados com terras-raras para aplicações em fotônica. / Germanate glasses containing metalic an semiconductor nanoparticles dopes with rare-earth ions for photonic aplicattions.
This work presents a spectroscopic study about Eu3+, Nd3+ and Er3+ rare-earth doped germanate glasses containing metallic and semiconductor nanoparticles (NPs) aiming the development of new materials for photonic applications. These glasses have a large transmission window (400-4500 nm), high refractive index (~ 1.9), low phonon energy (700 cm-1), high mecha
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/09/2010
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5. CARACTERIZAÇÃO TECNOLÓGICA DE UM SINTER FEED HEMATÍTICO CONTENDO DIFERENTES PROPORÇÕES E TIPOS DE SÍLICA NAS FRAÇÕES ADERENTES, INTERMEDIÁRIAS E NUCLEANTES
There are important Vale iron ore reserves located in the state of Minas Gerais. The hematite/itabirite relationship in the ROMs has been decreasing compared to the last decade. The beneficiation plants have been concentrating its efforts on reducing the silica content in the sinter feed in order to reach the quality levels demanded for the sintering process
Publicado em: 2010
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6. New technique for the implementation of digital demodulation of fiber optic gyroscopes / Implementação de uma nova tecnica para demodulação digital de sinal de giroscopio a fibra optica
Gyroscopes are devices used to measure angular orientation, being extensively employed for guidance, navigation and stabilization. Among the many types of gyroscopes, IFOG (Interferometer Fiber Optic Gyroscope), based on Sagnac effect, is the most interesting solution due to its high sensitivity, resolution, reliability, small size and EMI immunity. The pres
Publicado em: 2009
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7. Study and compensation of bias drift, scale factor stability and linearity of a conditioning and sign processing circuit of an interferometric fiber optic gyroscope / Estudo e compensação da deriva termica, estabilidade do fator de escala e lineariazação de um circuito de condicionamento e processamento de sinais de girometro interferometrico a fibra optica
Fiber Optic gyroscopes are an important part of inertial navigation systems. To meet the necessary specifications required for application in inertial systems, it is mandatory that the electronic Sagnac demodulator uses state of the art devices. The proposal of this work is to study and develop a technique to correct all together for the nonlinearities, the
Publicado em: 2009
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8. The study and design of an electronic system for signal processing of fiber optic gyroscopes with a dynamic modulation / Estudo e projeto de um sistema eletronico de processamento de sinais de girometros a fibra optica com modulação dinamica
Esta tese apresenta o estudo e o projeto de um processador eletrônico do sinal de um interferômetro de Sagnac a fibra óptica que procura atender especificações para aplicação em navegação inercial. Estudou-se o comportamento de Girômetros a fibra óptica com modulação de fase senoidal através de modelos e simulações de algumas técnicas de pro
Publicado em: 2009
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9. Efeito da reticulação induzida pela transglutaminase e o glutaraldeido sobre as propriedades das microparticulas obtidas por coacervação complexa / Effect of transglutaminase and glutaraldehyde induced crosslinking on properties of microparticles obtained by complex coacervation
Microparticles were produced by complex coacervation using gelatin and gum Arabic as wall forming materials and a mixture of paprika oleoresin-soy oil (1:10) in a quantity that correspond to 50% of wall material mass. The emulsions production order, gelatin/ paprika oleoresin-soy oil or gum Arabic/paprika oleoresin:soy oil, the crosslinking of the microparti
Publicado em: 2009
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10. L-Hydro treated homologous pulmonary graft vs. pulmonary homograft fresco: an experimental, comparative study / Estudo experimental comparativo do enxerto homólogo pulmonar tratado pelo processo L-Hydro com o homoenxerto pulmonar a fresco
Valve substitutes are highly important in account of their frequent use and since the success of a surgical procedure depends on their good performance. A variety of valve substitutes have been used, all presenting complications pertaining to their materials, such as thrombosis, calcification, degeneration, sterilization difficulties, cost, production comple
Publicado em: 2008
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11. Hiatoplastia com utilização de prótese de polipropileno revestida pelo grande omento : estudo experimental em coelhos / Hiatoplasty with polypropilene prósthesis wrapped with omentum : an experimental study in rabbits
Hiatoplasty with prosthesis is considered a polemic procedure. Therefore, we decided to study the utilization of polypropilene prosthesís at this anatomical site. Twenty four New Zealand male rabbits were operated on. Polypropilene prosthesis wrapped with omentum used in group 01. Polypropilene prosthesis only ( without omentum wrapping) was used in group 0
Publicado em: 2008
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12. Análise mecânica e microestrutural das ligas de cobalto-cromo de uso odontológico após sucessivas refundições
The cobalt-chromium alloy is extensively used in the Odontology for the confection of metallic scaffolding in partial removable denture. During the last few years, it has been reported an increasing number of premature imperfections, with a few months of prosthesis use. The manufacture of these components is made in prosthetic laboratories and normally invol
Publicado em: 2008