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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Comp?sitos Bulk Fill flu?dos versus resinas compostas tradicionais: comportamento mec?nico

Chaves, Let?cia Virginia de Freitas 07 July 2017 (has links)
Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-10-05T00:11:28Z No. of bitstreams: 1 LeticiaVirginiaDeFreitasChaves_DISSERT.pdf: 624609 bytes, checksum: 00e1748d54f2f6578477eb5c68293890 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-10-16T23:12:07Z (GMT) No. of bitstreams: 1 LeticiaVirginiaDeFreitasChaves_DISSERT.pdf: 624609 bytes, checksum: 00e1748d54f2f6578477eb5c68293890 (MD5) / Made available in DSpace on 2017-10-16T23:12:07Z (GMT). No. of bitstreams: 1 LeticiaVirginiaDeFreitasChaves_DISSERT.pdf: 624609 bytes, checksum: 00e1748d54f2f6578477eb5c68293890 (MD5) Previous issue date: 2017-07-07 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Objetivos: Avaliar a profundidade de polimeriza??o (PP), tens?o de contra??o (TC), resist?ncia flexural (RF), m?dulo de elasticidade (ME) e a resist?ncia de uni?o (RU) de tr?s comp?sitos Bulk Fill fluidos em compara??o a comp?sitos tradicionais de alta viscosidade. Metodologia: Tr?s comp?sitos Bulk fill fluidos (Filtek BKF, Surefil SDR, X-tra Base) e tr?s tradicionais ( Z250 XT, Grandioso, TPH3) foram utilizados. Para RF/ME, 60 amostras (n=10) em forma de barra (7 mm x 2 mm x 1 mm) foram confeccionadas e avaliadas por meio de uma M?quina de Ensaios Universal (MEU). Para PP e RU, cavidades c?nicas (n=10) preparadas em dentina bovina foram restauradas com os materiais. A PP foi analisada atrav?s da raz?o base/topo de microdureza de superf?cie e a RU pelo teste de push-out numa MEU. A TC foi mensurada em incremento ?nico das Bulk Fill e dois incrementos para as tradicionais em MEU acoplada a um extens?metro (n=5). Os dados foram estatisticamente avaliados por meio dos testes ANOVA 2 fatores e Tukey (p<0,05). Resultados: Para ME, as resinas convencionais apresentaram maiores valores diante de todas as resinas BKF, no entanto para a RF elas foram iguais, com exce??o apenas da BKF da VOCO que foi inferior. Para a PP convencionais e BKF foram estatisticamente semelhantes. Na TC e na RU as BKF apresentaram-se superiores as convencionais, tamb?m com exce??o apenas da Xtra Base Bulk Fill (VOCO) que foi estatisticamente igual as convencionais na RU. Conclus?o: As resinas Bulk Fill flu?das testadas BKF e SDR apresentaram as propriedades mec?nicas testadas superiores ou iguais aos comp?sitos tradicionais, exceto o m?dulo de elasticidade. / Objectives: To evaluate depth of polimerization (DP), contraction strress (SC), flexural strenght (FS), elastic modulus (EM) and bond strength (BS) of three low-viscosity Bulk Fill composites resin compare as of high-viscosity traditional composites. Methods: Three Bulk fill composites (Filtek BKF, Surefil SDR, X-tra Base) and three traditional ( Z250 XT, Grandioso, TPH3) were used. For FS/ME, 60 (n=10) bar specimens (7 mm x 2 mm x 1 mm) were prepared and evaluated with Universal Testing Machine (UTM). For DP e BS, conical cavities (n=10) were prepared in bovine dentine and restored with materials. DP was analyzed trough the ratio base/top with microhardness of surface and BS on the push-out test in UTM. SC was measured for to increment one of Bulk Fill Resins and two increments of traditional resins in UTM attached to a extensometer (n=5). The data were statistically evaluated by ANOVA 2-way/Tukey (p<0,05). Results: For EM the conventional resins show higher values compare to all the BKF resins, however for the FS they were the same, except for only the VOCO Bulk Fill that was inferior. For the PP, conventional and BKF were statistically similar. In TC and in BS the BKF were superior to conventional, also with the exception of Xtra Base Bulk Fill (VOCO), which was statistically the same as the conventional ones in the BS. Conclusion: The Bulk Fill composites resin BKF and SDR present most of property physical and mechanical higher or similar than traditional composites, except the elastic modulus.
2

Miguel Chikaoka: fotografia como prática da liberdade

MAGNO, Luciana Loureiro Figueira 01 March 2012 (has links)
Submitted by Irvana Coutinho (irvana@ufpa.br) on 2017-02-10T18:52:37Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Dissertacao_MiguelChikaokaFotografia.pdf: 98688547 bytes, checksum: af64030e129b5a7c8a5c8f28f8dd6812 (MD5) / Approved for entry into archive by Irvana Coutinho (irvana@ufpa.br) on 2017-02-10T18:53:22Z (GMT) No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Dissertacao_MiguelChikaokaFotografia.pdf: 98688547 bytes, checksum: af64030e129b5a7c8a5c8f28f8dd6812 (MD5) / Made available in DSpace on 2017-02-10T18:53:22Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Dissertacao_MiguelChikaokaFotografia.pdf: 98688547 bytes, checksum: af64030e129b5a7c8a5c8f28f8dd6812 (MD5) Previous issue date: 2012-03-01 / CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Esta pesquisa tem como objeto de estudo os processos empreendidos pelo fotógrafo e educador Miguel Chikaoka, que impulsionou em Belém, a partir da década de 1980, por meio das fotoatividades, um intenso movimento de arte e vida na cena da fotografia paraense, onde desenvolveu concomitantemente um peculiar método de ensino da fotografia, que se expande ao não delimitar-se apenas como exercício estético, plástico, visual, mas como mola ativadora de experiências sensíveis modificadoras, caminho às práticas da liberdade. / This research aims to study the processes undertaken by the photographer an educator Miguel Chikaoka who boosted in Belém from the 80’s through fotoatividades an intense movement of art and life in scene of photography in Pará, where he developed concurrently a unique teaching method of photography that expands the experience, not restricting it only toa n aesthetic exercise, plastic, visual, but as spring modifieractivating sensory experienses, way to the practice of freedom.

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