Zobrazeno 1 - 10
of 75
pro vyhledávání: '"Luiz C. Barbosa"'
Publikováno v:
Química Nova, Vol 21, Iss 4, Pp 517-520 (1998)
Externí odkaz:
https://doaj.org/article/0b46edb1c481431da9e7fd3196ad2c76
Publikováno v:
Química Nova, Vol 21, Iss 3, Pp 361-364 (1998)
We describe the preparation and some optical properties of high refractive index TeO2-PbO-TiO2 glass system. Highly homogeneous glasses were obtained by agitating the mixture during the melting process in an alumina crucible. The characterization was
Externí odkaz:
https://doaj.org/article/d9d692dbf47a49d3a20ff14df3d94a2a
Publikováno v:
Revista de Investigación de Física, Vol 5, Iss 01-02 (2002)
La espectroscopia Mlissbauer del 57Fe ha sido utilizada para investigar el proceso de transformaciones de las unidades de Te(Fe)-0 por la acción del óxido modificador LhO. Nuestros experimentos en el sistema vítreo Fe: LhO-Ti02-TeOz mostraron que
Externí odkaz:
https://doaj.org/article/be57106730794f66b7799affc49eb812
Autor:
V. Anjos, M.P.F. Graça, Luiz C. Barbosa, J. Suresh Kumar, Y.C. Ratnakaram, M. Radha, M.J. Soares, Leandro R. Tessler, Giácomo B. F. Bosco, M. Seshadri, Maria José Valenzuela Bell
Publikováno v:
International Journal of Applied Glass Science. 8:216-225
Tm3+ singly doped and Tm3+/Ho3+-codoped TeO2-Bi2O3-ZnO-Li2O-Nb2O5 (TBZLN) tellurite glasses were successfully prepared by the melt-quenching technique. Emission characteristics and energy transfer mechanisms were studied upon 785 nm laser diode excit
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fca4c0c87be21c087ad33960dc598e02
https://doi.org/10.1111/ijag.12213
https://doi.org/10.1111/ijag.12213
Publikováno v:
2018 SBFoton International Optics and Photonics Conference (SBFoton IOPC).
The present paper is related to the process of fabrication of a gradient refractive index polymer rod for use as a medium of image transmission and for preparing a polymeric optical fiber by melt spinning. It is used to the technique of external chem
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3cd678c85191c3cd5f89c0f2713f6abd
https://doi.org/10.1109/sbfoton-iopc.2018.8610945
https://doi.org/10.1109/sbfoton-iopc.2018.8610945
Publikováno v:
2018 SBFoton International Optics and Photonics Conference (SBFoton IOPC).
We describe our procedure to construct and fabricate microstructured optical fibers from medium-melting glass and equipment capable of manufacturing optical fibers for endoscopes. The manufacture of rigid endoscopes, with adequate resolution and low
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::63e54a5f77f4656d45bde39e13c322d8
https://doi.org/10.1109/sbfoton-iopc.2018.8610888
https://doi.org/10.1109/sbfoton-iopc.2018.8610888
Publikováno v:
Technological Advances in Tellurite Glasses ISBN: 9783319530369
Tellurite glasses present interesting physical and optical properties, such as high rates of linear and nonlinear refraction, low melting points, low and medium frequencies of phonons, and especially high solubility for rare-earth ions. Tellurite gla
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::55476b9acfa0afa104ab4576b2b2d0cb
https://doi.org/10.1007/978-3-319-53038-3_7
https://doi.org/10.1007/978-3-319-53038-3_7
Publikováno v:
Technological Advances in Tellurite Glasses ISBN: 9783319530369
Tellurite glasses have been studied since the 1990s, when researchers found that these materials could have great potential for applications in the field of photonics, due to properties such as high rates of linear and nonlinear refraction, medium-fr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dbe3a9e60c252438d14b50512ca518aa
https://doi.org/10.1007/978-3-319-53038-3_5
https://doi.org/10.1007/978-3-319-53038-3_5
Publikováno v:
Optical Materials. 36:1020-1026
A study of the broadband near-infrared emission in Pr3+ single doped and Pr3+/Yb3+ codoped tellurite–tungstate glasses for optical amplification is presented. In the Pr3+ single doped samples pumped at 474 nm the emission band at 1480 nm presents a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e994d1444148cd5f8b385ab2e8cdbd7e
https://doi.org/10.1016/j.optmat.2014.01.014
https://doi.org/10.1016/j.optmat.2014.01.014
Autor:
Luiz C. Barbosa
The Amazon region is the focus of intense conflict between conservationists concerned with deforestation and advocates of agro-industrial development. This book focuses on the contributions of environmental organizations to the preservation of Brazil