Natural Fibres
Mostrando 1-12 de 47 artigos, teses e dissertações.
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1. Surface Esterification of Sisal Fibres for use as Reinforcement in Cementitious Matrix
Vegetable fibres have been shown to be promising as reinforcement in composites because they are abundant, renewable, and low cost. However, the fibre-matrix interaction can be damaged by dimensional variation of vegetable fibres, due to moisture variations. The alkaline medium of cementitious matrix is aggressive to natural fibres, compromising their durabi
Mat. Res.. Publicado em: 30/09/2019
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2. Hybrid composites reinforced with short sisal fibres and micro ceramic particles
ABSTRACT Biocomposites reinforced with natural fibres have been extensively investigated as a promising replacing material for synthetic ones, such as the glass fibre reinforced composites. The length of natural fibres depends not only on the plant species, but also on the extraction processing. The heterogeneity of natural fibres, in terms of length, can be
Matéria (Rio J.). Publicado em: 20/07/2017
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3. Athermal bladder neck dissection during robot-assisted radical prostatectomy
Introduction With improved understanding of the precise anatomy, surgical techniques during robot-assisted radical prostatectomy (RARP) have been refined, with the aim of improving functional outcomes without compromising oncological adequacy and results. Nevertheless, postoperative urinary incontinence remains a frustrating side-effect. Anatomically, bladde
Int. braz j urol.. Publicado em: 2014-06
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4. Micromechanical analysis of hybrid composites reinforced with unidirectional natural fibres, silica microparticles and maleic anhydride
The work describes the analytical and experimental characterisation of a class of polymeric composites made from epoxy matrix reinforced with unidirectional natural sisal and banana fibres with silica microparticles and maleic anhydride fabricated by manual moulding. The analytical models, ROM rule of mixtures and Halpin-Tsai approach, have been used in conj
Mat. Res.. Publicado em: 11/10/2012
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5. Processing and characterization of biocomposites of PHB with acetylated and no-acetylate natural fibres of coconut and sisal / Processamento e caracterização de biocompositos de PHB com fibras naturais de coco e sisal acetiladas e não-acetiladas
The problem of urban waste accumulation has increased in recent decades and the large consumption of plastics is one of those responsible for this situation. These materiaIs have the ability to remain in the environment for many years making it difficult further to provide its correct destination. This problem was the main motivation of the work presented he
Publicado em: 2008
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6. REMOÇÃO DE ÍONS ZINCO (II) DE EFLUENTES DERIVADOS DE PROCESSOS DE GALVANOPLASTIA UTILIZANDO REJEITOS DE FIBRAS VEGETAIS MODIFICADAS QUIMICAMENTE
Many industrial activities contribute to a significant increase in the concentrations of metal ions in natural waters by not adhering to an appropriate treatment in accordance with the standards established by the legislation. The applicability of new methods of costbenefit has been developed in order to facilitate a system of treatment for removal of contam
Publicado em: 2008
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7. Utilization of cassava starch for the preparation of new termoplastic materials / Utilização de amido de mandioca na preparação de novos materiais termoplásticos
In this work it was studied the development of thermoplastic starches (TPS) prepared from raw cassava root and its derivatives, starch and bagasse (residue). The TPS were prepared by melt-processing employing glycerol as plasticizer in distinct proportions. It was searched for alternatives that could improve both, the mechanical performance and resistance to
Publicado em: 2007
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8. TEXTILE MODULAR SYSTEMS AS NATURAL FIBERS USE: A SUSTAINABLE ALTERNATIVE IN ARCHITECTURE &DESIGN / SISTEMAS MODULARES TÊXTEIS COMO APROVEITAMENTO DE FIBRAS NATURAIS: UMA ALTERNATIVA SUSTENTÁVEL EM ARQUITETURA &DESIGN
The natural fibers sustainable use in architectonic structural membranes construction is the main question of this dissertation. The association between the Textile Modular Systems and the inter-actions studies between natural fibers, technologies, and environment, aloud to incorporate into conception and manufacturing strategies of Architecture &Design obje
Publicado em: 2006
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9. 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
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10. Uso de cal e fibras na melhoria de materiais para utilização em estruturas de pavimentos / Use of lime and fibres in the improvement of materials for use in structures of pavements
Este trabalho ambienta-se na Província Petrolífera de Urucu, posto de extração de gás e petróleo da Petrobras S.A., situado no município de Coari, AM. Essa região é caracterizada por chuvas intensas que, aliadas à baixa capacidade de suporte do solo assim como à carência de materiais pétreos na região dificulta as obras de pavimentação, torna
Publicado em: 2006
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11. TOUGHNESS OF NON CONVENTIONAL COMPOSITE MATERIALS / TENACIDADE DE MATERIAIS COMPÓSITOS NÃO CONVENCIONAIS
O objetivo deste trabalho foi avaliar as propriedades mecânicas, físicas e microestruturais de materiais compósitos cimentícios reforçados por fibras naturais e de laminados de bambu. O trabalho experimental foi direcionado para a determinação da tenacidade. Para se determinar a tenacidade foram utilizados três tipos de ensaios: impacto Charpy, impac
Publicado em: 2004
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12. EFFECTS OF RICE HUSK ASH ON PROPERTIES OF BAMBOO-PULP-REINFORCED CEMENT COMPOSITES / EFEITO DA ADIÇÃO DE CINZA DE CASCA DE ARROZ NO COMPORTAMENTO DE COMPÓSITOS CIMENTÍCIOS REFORÇADOS POR POLPA DE BAMBU
Os problemas à saúde acarretados pela exposição às fibras minerais do amianto (asbesto) têm motivado esforços para a substituição destas fibras nos diversos componentes que as empregam como matéria prima. Devido às propriedades físicas e mecânicas e estabilidade química do amianto, bem como sua afinidade natural com a matriz cimentícia, o cime
Publicado em: 2004