Aplicação do Instrumento de Análise Ergonômica - MET na Construção Civil

The development of biodegradable polymer composites is a promising alternative for obtaining environmentally friendly materials. The aim of this study was to develop polyhidroxybutyrate (PHB) composites with rice husk ashes and evaluate mechanical properties by tensile tests, determining stress and elongation at break and modulus of elasticity, flexural strength test and Izod impact tests, as well as density and hardness. The composites showed impact strength up to 25% greater than the polymeric material containing only PHB. Also for the testing of tensile strength in bending showed significant improvements in the composites up to 15%. The results indicate that the ash as filler in PHB is viable for applications in materials that already use the PHB in pure form, considering the technical aspects studied (processing and properties) and the environment, since in most tests there was a gain or maintenance of properties when compared to PHB.

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Study on Physical and Mechanical Properties of PHB Biocomposites with Rice Hull Ash

Alberti

Souza²,

Bucci

et al. 2014

MSF

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Evaluation of the Deposition of Nanoparticles in Fibrous Filter

Barros

Cirqueira

Aguiar

2014

MSF

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This study aimed to evaluate the deposition of NaCl nanoparticles during filtration in a cellulose filter medium (HEPA). The diameter of the generated polydisperse particles was between 6 and 800nm. Deposition was evaluated with the curves of pressure drop as a function of time. The permeability of the filter medium was determined and, after the deposition of particles, specific resistance of the formed cake was obtained. Filter performance was evaluated by counting particles before and after the filter medium and the pressure drop was monitored in order to obtain the filtration curve. Filtration velocity was kept at 0.06 m/s, and the concentration of the solution generated at a rate of 0.0042 L /min in a commercial inhaler was of 5 g/L. The results showed that this filter showed two steps during the deposition of particles, an internal filtration stage and a surface filtration stage. Although this filter is highly efficient in removing particles in the range evaluated, roughly 100%, particle penetration was observed in the range between 50 and 200nm.

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Evaluation of Self Cleaning System in Aerosol Filtration Using Synthetic Filter

Arouca

Gerkman

Arouca

et al. 2014

MSF

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In industries that work with particulate material is observed from among other concerns, not to discard solid material in the air. Aiming to develop gas-solid filtration equipment more efficient, the study of a self-cleaning system utilizing filter fabric made from synthetic material, was conducted using the phosphate rock as particulate material. The objective of this study is to evaluate the performance of a vibratory system filtration of gases. The system is made up a box filter coupled to an eccentric motor which causes a continuous vibration during the filtration cycle, not being necessary to interrupt the process to the procedure of fabric filter cleaning. We used polyester synthetic filter for the tests. With known relative humidity and temperature at which the tests were performed, it was possible to estimate the performance of the equipment in continuous vibration filtration of pulverulent material dispersed in gas currents, under the influence of different vibration frequencies.

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Aplicação do Instrumento de Análise Ergonômica - MET na Construção Civil

Cited by 5 publications

References 1 publication

Study on Physical and Mechanical Properties of PHB Biocomposites with Rice Hull Ash

Study on Physical and Mechanical Properties of PHB Biocomposites with Rice Hull Ash

Evaluation of the Deposition of Nanoparticles in Fibrous Filter

Evaluation of Self Cleaning System in Aerosol Filtration Using Synthetic Filter

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