Tellurite
Mostrando 1-12 de 123 artigos, teses e dissertações.
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1. Study and Optimization of Raman Amplifiers in Tellurite-Based Optical Fibers for Wide-Band Telecommunication Systems
Abstract Here we present a numerical analysis and the optimization of a multi-pump discrete Raman amplification system based on the use of a Tellurite optical fiber as the gain media. By using previously reported optimization techniques we were able to exploit the high Raman gain of Tellurite optical fibers and its multipeak spectrum to achieve amplification
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 19/06/2019
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2. Characterization of Nd3+-doped Tellurite Glasses with Low OH Content
This work presents the results of the investigation of structural and thermal properties of Nd3+-doped tellurite glasses with low OH content. The samples were characterized by XRD, FTIR, DTA, UV/VIS/NIR and Archimedes’ method. Tellurite glasses of composition (100 – x)(0.8TeO2 + 0.2WO3) + xNd2O3 (x = 0, 0.05, 0.5, 1, 2, and 4 mol%) were prepared in both
Mat. Res.. Publicado em: 23/10/2015
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3. Corynebacterium diphtheriae putative tellurite-resistance protein (CDCE8392_0813) contributes to the intracellular survival in human epithelial cells and lethality of Caenorhabditis elegans
Corynebacterium diphtheriae, the aetiologic agent of diphtheria, also represents a global medical challenge because of the existence of invasive strains as causative agents of systemic infections. Although tellurite (TeO32-) is toxic to most microorganisms, TeO32--resistant bacteria, including C. diphtheriae, exist in nature. The presence of TeO32--resistanc
Mem. Inst. Oswaldo Cruz. Publicado em: 24/06/2015
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4. Survival of Shiga toxin-producing Escherichia coli O157:H7 in Minas frescal cheese
Shiga toxin-producing Escherichia coli (STEC) O157:H7 strains (isolated by cattle’s faeces and a reference strain, EDL933), were inoculated into pasteurized milk (102 and 103 cells.mL–1) to prepare the Minas frescal cheese. As control was used uninfected milk. Physicochemical and microbiological analyses were performed to milk and elaborated cheese. The
Food Sci. Technol. Publicado em: 2015-03
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5. Caracterização elétrica de filmes finos de telureto com nanopartículas de ouro depositados pela técnica sputtering. / Electrical characterization of tellurite thin films containing gold nanoparticles deposited by sputtering technique.
Este trabalho tem como objetivo a produção e caracterização elétrica de filmes finos de telureto com nanopartículas de ouro para aplicações em microeletrônica. Filmes finos foram produzidos por magnetron sputtering a partir de alvos de telureto cerâmico e de ouro metálico. Foi desenvolvida metodologia adequada para a nucleação das nanopartícula
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/02/2012
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6. Produção e caracterização de vidros de telureto tridopados com íons de terras raras e nanopartículas metálicas para uso em displays coloridos. / Production and characterization of tellurite glasses doped with rare earth ions and metallic nanoparticles for use in color displays.
This works presents studies of the production and the characterization of TeO2 -PbO-GeO2 doped with erbium, thulium and ytterbium ions and also prepared with different metallic nanoparticles for applications in displays. This glass system presents a broad transmission window in the visible and infrared (350 - 6500 nm), high solubility for rare earth ions, lo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/04/2011
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7. Estudos das propriedades estruturais e ópticas de vidros teluritos / Studies of the structural and optical properties of the tellurite glasses
Vidros teluritos são considerados fortes candidatos para aplicações em lasers e óptica não linear devido a importantes características, como o elevado índice de refração, baixa energia de fônons, baixa temperatura de transição vítrea e sua fácil preparação. Neste trabalho foram produzidas amostras dos sistemas vítreos TeO2- ZnO-Na2O, TeO2-Nb
Publicado em: 2011
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8. Fabrication and characterization of tellurite and germanate waveguides for optoelectronics applications. / Produção e caracterização de guias de onda de telureto e germanato para aplicações em optoeletrônica.
The objective of this work is the production and characterization of GeO2-PbO and TeO2-ZnO waveguides. The waveguides were produced using thin films and glasses by means of different procedures. The films were produced using the RF magnetron sputtering method and characterized by a variety of techniques. In particular, scanning electron microscopy was essent
Publicado em: 2010
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9. Síntese e caracterização de vidros de telureto dopados com íons de Eu3+ e Tb3+ com nanopartículas metálicas. / Synthesis and characterization of tellurite glasses doped with Eu3+ and Tb3+ ions with metallic nanoparticles.
This work presents the synthesis and characterization of luminescent properties of vitreous systems TeO2-ZnO e TeO2-ZnO-PbO-Na2O doped with ions of europium and terbium containing silver, gold and copper nanoparticles (NPs), for applications in photonic devices. These glasses have a large window transmission (350-6500 nm), chemical stability, mechanical and
Publicado em: 2009
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10. CRYSTALLINE FLUORIDE FIBER LASER AND CHARACTERIZATION OF RARE EARTH DOPED FIBERS / Laser de fibra monocristalina de fluoretos e caracterização de fibras dopadas com terras raras
Diode pumped solid state lasers have supplied a large part of the search for high power lasers, with good beam quality, in addition, these lasers are useful for generation of visible laser radiation. Fiber lasers have the capacity to reach these high powers with a good beam quality, due to its special design which confines the radiation through long fiber le
Publicado em: 2008
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11. Characterization of silver nanostructures in tellurite glasses for photonic applications. / Caracterização de nanoestruturas de prata em vidros de telureto para aplicações em fotônica.
Este trabalho apresenta um estudo sobre a influência de nanopartículas de prata nas propriedades ópticas de vidros de telureto dopados com íons de terras raras para aplicações em fotônica. Foram estudados três sistemas vítreos diferentes, TeO2-ZnO (B1), TeO2-PbO-GeO2 (T1) e TeO2-GeO2-BaO-Nb2O5 (Q3), todos preparados com óxidos de Itérbio (Yb2O3),
Publicado em: 2008
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12. Propriedades ópticas de vidros teluretos dopados com íons terras-raras e nanopartículas de ouro
In this work we will accomplish the optical characterization of host vitreous, doped with rare-earth ions and nanoparticles of gold, with several compositions, but maintaining as main element the tellurium. Those stencil they are known in the literature as tellurite glasses. We will treat of two groups of samples, in the first we have glasses teluretos with
Publicado em: 2007