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Rôle des absorbeurs UV inorganiques sur la photostabilisation des systèmes bois-finition transparente.
No full textThis project deals with a new inorganic UV absorber able to answer a 2nd generation requirements. Two new inorganic products have been developed and tested for this purpose. Because wood is a natural material, heterogeneous and dynamic, the weathering exposure results were rather variable, not only according to the wood species and type of resin used but also according to the type of ageing. In parallel to the weathering exposure tests, the effect of the UV absorbers onto physical, chemical and mechanical properties of finishes was investigated by implementing some analysis techniques as TMA analysis, mechanical tests, UV-visible and ESR spectra. It appears that the quality of the UV absorber to attenuate UV radiation is a fundamental element in determining photostabilisation effectiveness. In the other hand, contrarily to organic UV absorbers, the inorganic products increase the coating Tg value after weathering exposure. These phenomena can lead in particular to the crack formation.Ce travail est une étude exploratoire pour la production d'un anti-UV inorganique de 2ème génération. Deux produits inorganiques ont été synthétisés et testés.Face à un matériau naturel, hétérogène et dynamique tel que le bois, les résultats d'évaluation des performances de photostabilisation sont assez variables non seulement en fonction de l'essence de bois et du type de résine utilisés mais aussi suivant le type de vieillissement. Parallèlement aux tests de vieillissement, l'effet des différents anti-UV sur les propriétés physico-chimiques et mécaniques des films de finition a été étudié en mettant en oeuvre des techniques d'analyse telle que la spectroscopie UV-visible, TMA, RPE et des essais mécaniques. Il apparaît que le pouvoir photoprotecteur joue un rôle important dans les performances de photostabilisation. D'autre part, contrairement aux absorbeurs UV organiques, les inorganiques font augmenter la Tg facilitant ainsi l'apparition des craquelures du film de finition
Rôle des absorbeurs UV inorganiques sur la photostabilisation des systèmes bois-finition transparente
No full textDiplôme : Dr. d'UniversiteThis project deals with a new inorganic UV absorber able to answer a 2nd generation requirements. Two new inorganic products have been developed and tested for this purpose. Because wood is a natural material, heterogeneous and dynamic, the weathering exposure results were rather variable, not only according to the wood species and type of resin used but also according to the type of ageing. In parallel to the weathering exposure tests, the effect of the UV absorbers onto physical, chemical and mechanical properties of finishes was investigated by implementing some analysis techniques as TMA analysis, mechanical tests, UV-visible and ESR spectra. It appears that the quality of the UV absorber to attenuate UV radiation is a fundamental element in determining photostabilisation effectiveness. In the other hand, contrarily to organic UV absorbers, the inorganic products increase the coating Tg value after weathering exposure. These phenomena can lead in particular to the crack formation.Ce travail est une étude exploratoire pour la production d'un anti-UV inorganique de 2ème génération. Deux produits inorganiques ont été synthétisés et testés. Face à un matériau naturel, hétérogène et dynamique tel que le bois, les résultats d'évaluation des performances de photostabilisation sont assez variables non seulement en fonction de l'essence de bois et du type de résine utilisés mais aussi suivant le type de vieillissement. Parallèlement aux tests de vieillissement, l'effet des différents anti-UV sur les propriétés physico-chimiques et mécaniques des films de finition a été étudié en mettant en oeuvre des techniques d'analyse telle que la spectroscopie UV-visible, TMA, RPE et des essais mécaniques. Il apparaît que le pouvoir photoprotecteur joue un rôle important dans les performances de photostabilisation. D'autre part, contrairement aux absorbeurs UV organiques, les inorganiques font augmenter la Tg facilitant ainsi l'apparition des craquelures du film de finition
Rôle des absorbeurs UV inorganiques sur la photostabilisation des systèmes bois-finition transparente
No full textDiplôme : Dr. d'UniversiteThis project deals with a new inorganic UV absorber able to answer a 2nd generation requirements. Two new inorganic products have been developed and tested for this purpose. Because wood is a natural material, heterogeneous and dynamic, the weathering exposure results were rather variable, not only according to the wood species and type of resin used but also according to the type of ageing. In parallel to the weathering exposure tests, the effect of the UV absorbers onto physical, chemical and mechanical properties of finishes was investigated by implementing some analysis techniques as TMA analysis, mechanical tests, UV-visible and ESR spectra. It appears that the quality of the UV absorber to attenuate UV radiation is a fundamental element in determining photostabilisation effectiveness. In the other hand, contrarily to organic UV absorbers, the inorganic products increase the coating Tg value after weathering exposure. These phenomena can lead in particular to the crack formation.Ce travail est une étude exploratoire pour la production d'un anti-UV inorganique de 2ème génération. Deux produits inorganiques ont été synthétisés et testés. Face à un matériau naturel, hétérogène et dynamique tel que le bois, les résultats d'évaluation des performances de photostabilisation sont assez variables non seulement en fonction de l'essence de bois et du type de résine utilisés mais aussi suivant le type de vieillissement. Parallèlement aux tests de vieillissement, l'effet des différents anti-UV sur les propriétés physico-chimiques et mécaniques des films de finition a été étudié en mettant en oeuvre des techniques d'analyse telle que la spectroscopie UV-visible, TMA, RPE et des essais mécaniques. Il apparaît que le pouvoir photoprotecteur joue un rôle important dans les performances de photostabilisation. D'autre part, contrairement aux absorbeurs UV organiques, les inorganiques font augmenter la Tg facilitant ainsi l'apparition des craquelures du film de finition
Rôle des absorbeurs UV inorganiques sur la photostabilisation des systèmes bois-finition transparente.
No full textThis project deals with a new inorganic UV absorber able to answer a 2nd generation requirements. Two new inorganic products have been developed and tested for this purpose. Because wood is a natural material, heterogeneous and dynamic, the weathering exposure results were rather variable, not only according to the wood species and type of resin used but also according to the type of ageing. In parallel to the weathering exposure tests, the effect of the UV absorbers onto physical, chemical and mechanical properties of finishes was investigated by implementing some analysis techniques as TMA analysis, mechanical tests, UV-visible and ESR spectra. It appears that the quality of the UV absorber to attenuate UV radiation is a fundamental element in determining photostabilisation effectiveness. In the other hand, contrarily to organic UV absorbers, the inorganic products increase the coating Tg value after weathering exposure. These phenomena can lead in particular to the crack formation.Ce travail est une étude exploratoire pour la production d'un anti-UV inorganique de 2ème génération. Deux produits inorganiques ont été synthétisés et testés.Face à un matériau naturel, hétérogène et dynamique tel que le bois, les résultats d'évaluation des performances de photostabilisation sont assez variables non seulement en fonction de l'essence de bois et du type de résine utilisés mais aussi suivant le type de vieillissement. Parallèlement aux tests de vieillissement, l'effet des différents anti-UV sur les propriétés physico-chimiques et mécaniques des films de finition a été étudié en mettant en oeuvre des techniques d'analyse telle que la spectroscopie UV-visible, TMA, RPE et des essais mécaniques. Il apparaît que le pouvoir photoprotecteur joue un rôle important dans les performances de photostabilisation. D'autre part, contrairement aux absorbeurs UV organiques, les inorganiques font augmenter la Tg facilitant ainsi l'apparition des craquelures du film de finition
Rôle des absorbeurs UV inorganiques sur la photostabilisation des systèmes bois-finition transparente.
No full textThis project deals with a new inorganic UV absorber able to answer a 2nd generation requirements. Two new inorganic products have been developed and tested for this purpose. Because wood is a natural material, heterogeneous and dynamic, the weathering exposure results were rather variable, not only according to the wood species and type of resin used but also according to the type of ageing. In parallel to the weathering exposure tests, the effect of the UV absorbers onto physical, chemical and mechanical properties of finishes was investigated by implementing some analysis techniques as TMA analysis, mechanical tests, UV-visible and ESR spectra. It appears that the quality of the UV absorber to attenuate UV radiation is a fundamental element in determining photostabilisation effectiveness. In the other hand, contrarily to organic UV absorbers, the inorganic products increase the coating Tg value after weathering exposure. These phenomena can lead in particular to the crack formation.Ce travail est une étude exploratoire pour la production d'un anti-UV inorganique de 2ème génération. Deux produits inorganiques ont été synthétisés et testés.Face à un matériau naturel, hétérogène et dynamique tel que le bois, les résultats d'évaluation des performances de photostabilisation sont assez variables non seulement en fonction de l'essence de bois et du type de résine utilisés mais aussi suivant le type de vieillissement. Parallèlement aux tests de vieillissement, l'effet des différents anti-UV sur les propriétés physico-chimiques et mécaniques des films de finition a été étudié en mettant en oeuvre des techniques d'analyse telle que la spectroscopie UV-visible, TMA, RPE et des essais mécaniques. Il apparaît que le pouvoir photoprotecteur joue un rôle important dans les performances de photostabilisation. D'autre part, contrairement aux absorbeurs UV organiques, les inorganiques font augmenter la Tg facilitant ainsi l'apparition des craquelures du film de finition
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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