O período de Garrett na Bélgica (1834-1836) em Memorias Biographicas (de Gomes de Amorim, 1881-1884) e em A Lua de Bruxelas (de Amadeu Lopes Sabino, 2000)

O propósito desta dissertação é analisar o período no qual Almeida Garrett esteve em Bruxelas (1834-1836) como Encarregado de Negócios Estrangeiros e Cônsul Geral de Portugal. Para isso, serão tomadas como base as obras Garrett Memorias Biographicas (1881-1884) de Francisco Gomes de Amorim e A Lua de Bruxelas (2000) de Amadeu Lopes Sabino. Estas obras apresentam as dificuldades financeiras de Garrett, devido ao desprezo do governo português. A biografia é marcada pelo discurso moldado de Amorim, por causa da forte relação de amizade que teve com Garrett, sendo este seu pai literário. Já Sabino apresenta um romance centrado nessa temporada, misturando narrativa histórica, dados biográficos e ficção. Dessa forma, neste trabalho, os discursos serão comparados, explicitando o tom específico de cada um: ambos apresentam as relações do intelectual com o país e com a sociedade, em uma época de grandes mudanças; porém, Amorim guarda um certo verniz e silencia sobre alguns acontecimentos, principalmente relacionados ao casamento de Garrett. Sabino tem, nesse relacionamento com a esposa (Luísa Midosi), o teor do seu romance documentado, se pautando exatamente a partir do que Amorim deixa como enigma

Double-cladding Yb3+ fiber for free-space optical communication

The experiment result of Nd:YVO4 laser pumped by laser diode that was amplified by double-cladding Yb3+ fiber is reported. Stable mode-locking pulses are obtained at repetition rate of 320 MHz and the output power is 15 mW. When laser power is amplified by Yb3+- doped double-cladding fiber amplifier, its power can get to 600 mW. Based on these, experiment of double-frequency is carried out, and green laser with power of 4 mW is obtained. (c) 2007 Wiley Periodicals, Inc.

Space-selective co-precipitation of silver and gold nanoparticles in femtosecond laser pulses irradiated Ag+, Au3+ co-doped silicate glass

We report on space-selective co-precipitation of silver and gold nanoparticles in Ag+, Au3+ co-doped silicate glasses by irradiation of femtosecond laser pulses and subsequent annealing at high temperatures. The color of the irradiated area in the glass sample changed from yellow to red with the increase of the annealing temperature. The effects of average laser power and annealing temperature on precipitation of the nanoparticles were investigated. A reasonable mechanism was proposed to explain the observed phenomena. (c) 2006 Elsevier Ltd. All rights reserved.

Space-selective precipitation of Au nanoparticles inside silica gel

Au colloids were prepared by irradiation with a Nd:YAG laser. Au nanoparticles were characterized by absorption spectra, transmission electron microscopy (TEM) and X-ray diffraction (XRD) analysis. It is found that the wavelength of the laser has no effect on the size but the number of the Au nanoparticles. By irradiating a transparent silica gel doped with gold ions with the focused laser in the gel and subsequent exposing in air, a space-selective pattern of letter "P" consisting of Au nanoparticles was observed inside the silica gel.