Asbestos
Mostrando 13-24 de 515 artigos, teses e dissertações.
-
13. Resposta comparativa pleural "in vivo" e do mesotélio "in vitro" à exposição por diferentes fibras de asbesto / Comparison of in vivo pleural response and in vitro mesothelial response to different asbestos fibers
Asbestos-derived products are used thoroughly by industry. Several diseases related to asbestos exposition have been described, among them the primary tumor of the pleura mesothelioma. The mechanisms by which asbestos fibers produce injury to the pleural space are not clear. Among the factors possibly implicated are the effects secondary to an inflammatory r
Publicado em: 2006
-
14. Solar Disinfection Evaluation and its Social Viability at State of Ceará, Brazil / Avaliação do Processo de Desinfecção Solar (SODIS) e de sua Viabilidade Social no Estado do Ceará
Despite the importance of sanitation for well-being of the mankind and the natural resources conservation, still today a large number of people do not have access to wastewater system neither to public water supply. One technique which has being studied and applied in developing countries as a safe household water treatment method is solar disinfection, SODI
Publicado em: 2006
-
15. Utilização de pozolanas em compósitos de cimento reforçados com fibras de celulose e PVA. / Pozzolan utilization in cement composites reinforced with celullose and PVA fibers.
Composites reinforced with natural fibers are a good asbestos fibercomposites replacement material, as a result of the great natural fiber avaibility such as coco nut, sisal and cellulose. Durability aspects need to be improved, like the decrease of fiber resistance in alkaline environment causing the loss of mechanical properties of the composites. An alter
Publicado em: 2006
-
16. RETRAÇÃO, FLUÊNCIA E FRATURA EM COMPÓSITOS CIMENTÍCIOS REFORÇADOS COM POLPA DE BAMBU / SHRINKAGE, CREEP AND FRACTURE OF CEMENTITIOUS COMPOSITES REINFORCED WITH BAMBOO PULP
The application of cimentitious composites using vegetal fibers in substitution of asbestos is a worldwide fact in the fiber cement industry. Despite their good mechanical properties and durability, the use of asbestos fibers causes well-known health hazards. Although vegetal fibers have relatively poor mechanical properties compared with synthetic fibers, t
Publicado em: 2006
-
17. Estudo de variáveis de composição e processo para controle da compressibilidade
Brake pads for automotive brake systems represent one of the most complex composite materials since they contain many components with widely varying physical and chemical properties. This multiphase nature is necessary to satisfy a wide variety of performance related demands. Processing conditions also have a major influence on the properties of these comple
Publicado em: 2006
-
18. Aspectos produtivos e análise do desempenho do fibrocimento sem amianto no desenvolvimento de tecnologia para telhas onduladas / Productive aspects and performance of fibrecement without asbestos in the development of technology for undulate roofing tiles
Estudos anteriores utilizando matriz cimentícia reforçada exclusivamente com fibras vegetais propiciaram a produção de telhas com desempenho aceitável nas idades iniciais. Porém, com o envelhecimento natural, as telhas apresentaram significativa redução do desempenho mecânico, fato este atribuído principalmente ao ataque alcalino da matriz cimentí
Publicado em: 2006
-
19. The mechanism of changes in the surface layer of grey cast iron automotive brake disc
The aim of the study was to create a model, describing the run of tribological processes in the surface layer of grey cast iron automotive brake discs. Grey cast iron discs mating with non-asbestos organic brake pads were chosen for the investigations, as the most widely used materials in car brakes. Samples for surface analysis were prepared from disc opera
Materials Research. Publicado em: 2005-12
-
20. A influÃncia do tipo e da quantidade de cargas nas propriedades mecÃnicas de elastÃmeros usados como isolantes tÃrmicos em motores-foguetes.
No presente trabalho foi estudada a influÃncia do tipo e da quantidade de cargas nas propriedades mecÃnicas de elastÃmeros usados como isolantes tÃrmicos em motores-foguetes. Foram selecionados seis tipos de cargas: sÃlica, caulim, talco, Ãxido de ferro, asbestos e negro de fumo. A quantidade de carga adicionada foi variada de acordo com a carga utiliz
Publicado em: 2004
-
21. Durabilidade de argamassas modificadas por polimeros e reforçadas com fibras vegetais / Durability of fiber-cement polimer modify
Several researches on vegetal-fiber-cement composites have been developed aiming to solve problems related to the banishment of asbestos and environmental damages due to deposition or burnirng of agro-industry residues. The durability of the cellulose-cement composites is a key factor to introduce such material in the market. Several researches have been dev
Publicado em: 2004
-
22. Identification of rounded atelectasis in workers exposed to asbestos by contrast helical computed tomography
Rounded atelectasis (RA) is a benign and unusual form of subpleural lung collapse that has been described mostly in asbestos-exposed workers. This form of atelectasis manifests as a lung nodule and can be confused with bronchogenic carcinoma upon conventional radiologic examination. The objective of the present study was to evaluate the variation in contrast
Brazilian Journal of Medical and Biological Research. Publicado em: 2003-10
-
23. Mid amphibolite facies metamorphism of harzburgites in the Neoproterozoic Cerro Mantiqueiras Ophiolite, southernmost Brazil
O estudo integrado de relações geológicas, micro-estruturais e composição química de minerais resultou na obtenção de informações muito valiosas sobre a evolução dos harzburgitos do Ofiolito Cerro Mantiqueiras, de idade Neoproterozóica. Este importante marcador geotectônico da evolução geológica do extremo sul do Escudo Brasileiro foi serpen
Anais da Academia Brasileira de Ciências. Publicado em: 2003-03
-
24. Avaliação clinico-funcional de trabalhadores expostos ao asbesto na atividade de mineração
Objective: Given tOOt the production of dust is intrinsic to the extracting process in mining sites, exposure to dust has become a principal hea1ter risk to mine workers. Mining sites are characteristically situated at long distances ttom urban centers and consequently, access to health examinations using advanced technologies is difficult. This study propos
Publicado em: 2003