Pratos e mais pratos: louças domésticas, divisões culturais e limites sociais no Rio de Janeiro, século XIX

Reply to ten comments on a paper published in the last issue of this journal. The discussion follows along six main lines: History museums, identity, ideology and the category of nation; the need of material collections and their modalities: patrimonial, operational, virtual; theater versus laboratory; visitors and their ambiguities; Public History: the museum and the academy.Resposta aos comentários de dez especialistas que contribuíram no debate de texto publicado no último número desta revista. A discussão orientou-se segundo seis tópicos principais: museus históricos, identidade, ideologia e a categoria de nação; a necessidade de acervos materiais e suas modalidades: acervo patrimonial, operacional, virtual; teatro versus laboratório; o público e suas ambigüidades; História Pública: o museu e a Academia

Spectroscopic study performed on films of (3-trimethoxysilylpropyl)ethylenediamine and a dental material (acrylic resin) doped with the luminescent complexes Eu(fod)(3)center dot 2H(2)O and Eu(fod)(3)center dot terpy

By using (3-trimethoxysilylpropyl) ethylenediamine (TSPED) and a dental material (acrylic resin) as precursors, self-standing films doped with the luminescent complexes Eu(fod)(3).2H(2)O and Eu(fod)(3).terpy were prepared. The doped films were so studied from a spectroscopic point of view. Is verified that the film composition exerts remarkable effects on both, the intensity and lifetime of the emission process. Acrylic resin films reduces the intensity of the emission process, but increases the lifetime,of a such process, in comparison with TSPED films, for which an opposite behavior is observed. The measured lifetimes for the emission process for the compounds Eu(fod)(3).2H(2)O in TSPED and acrylic resin films are 306 and 369 mus, respectively. For the same film matrices, the measured lifetimes for the complex Eu(fod)(3).terpy gave the values 347 and 880 mus, respectively. (C) 2002 Editions scientifiques et medicales Elsevier SAS. All rights reserved.4101343134

Spectroscopic study of transparent self-standing films of (3-glycidoxypropyl) trimethosysilane and (3-trimethoxysilylpropyl) ethylenediamine doped with europium complexes

By using (3-glycidoxypropyl) trimethosysilane (GPTMS) and (3-trimethoxysilylpropyl) ethylenediamine (TSPED) as precursors, transparent self-standing films doped with the luminescent complexes Eu(hfC)(3) . bipy and Eu(hfc)(3) . terpy were prepared. The doped films were so studied from a spectroscopic point of view. It is verified that the film composition exerts effects on both, the intensity and lifetime of the emission process. For the GPTMS and TSPED films the measured lifetimes gave the values 250 and 183 mus respectively, for the complex Eu(hfC)(3) . terpy. The TSPED matrix provides emissions with higher intensities, but lower lifetimes. For the GPTMS films an opposite behavior is observed. Comparing the emission spectra for GPTMS films doped with the complexes Eu(hfC)(3)bipy and Eu(hfc)(3)terpy, it is verified that not only the chemical composition of GPTMS or the type of ligand involved in the complex, but also the symmetry of the complex used as dopant, will be of prominent importance to the spectroscopic properties of the obtained doped films. (C) 2003 Elsevier B.V. All rights reserved.24345345