نتایج جستجو برای: basic metal industry
تعداد نتایج: 647827 فیلتر نتایج به سال:
Workers in the road construction industry include asphalt plant, ground construction, and road paving workers. These individuals can be exposed to a wide range of potentially hazardous substances. A summary of levels of exposure to different substances measured during road construction is presented. In modern road paving, workers typically are exposed to 0.1 to 2 mg/m3 of bitumen fume, which in...
Metal fiber porous materials with intrinsic properties of metal and functional properties of porous materials have received a great deal of attention in the fundamental research and industry applications. With developments of the preparation technologies and industrial requirements, porous fiber metals with excellent properties are developed and applied in many industry areas, e.g., sound absor...
The present article studies the interactive relationships between oil price volatility and industries stocks of basic metals, petroleum and chemical products by using Vector Auto Regressive (VAR) and Multivariate Generalized Autoregressive Conditional Heteroskedastisity (GARCH) models from March 2004 to March 2015 empirically . In this research, the VAR-GARCH model is proposed, which is develop...
original article introduction: a practical solution which is sometimes efficient for noise control in the receiver locations is to enclose workers in an acoustic cabin. accordingly, prediction of the noise insulation performance is regarded as an important aspect of the design a personnel cabin. this study empirically aims to design an acoustic cabin using sandwich panels in a typical metal i...
Thermal cycling is widely used as a qualification test in the microelectronic industry. This paper investigates an intriguing failure mode observed in such a test. Near the corners of a silicon die, shear stresses arise due to thermal expansion mismatch between the silicon and the packaging substrate. These shear stresses may have a small magnitude, being transmitted through packaging polymers,...
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background: low back pain (lbp) is one of the most common problems among the workers of different industries. the role of occupational factors in causing the lbp has been indicated previously. lbp has great socio-economic costs and most of its costs are related to the chronic lbp. the aim of this study was to identify the occupational risk factors that are related to the progression of the lbp ...
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