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51.
《International Journal of Sustainable Engineering》2013,6(3):280-285
Phosphorus-containing moieties can be added to the ninth and/or tenth positions of a fatty chain of a methyl ester utilising an epoxide route. In this route, methyl oleate is epoxidised, and then ring opened using dibutyl phosphate to yield – among others – a dioxaphospholane-containing derivative of methyl octadecanoate. Progress of the reaction was determined by gas chromatography-mass spectrometry and compounds were identified by nuclear magnetic resonance spectroscopy. Addition of a titanium and zirconium oxide catalyst increased the yield of dioxaphospholane from 27%, observed without catalyst, to 37%. A similar reaction using bis-2-ethylhexyl phosphate gave 22% and 29% yield. However, an aryl phosphate, diphenyl phosphate, was not active in these reactions. The aliphatic compounds obtained are likely to be useful sulphur and metal-free extreme pressure lubricant additives which are highly compatible with vegetable oil-based lubricants. 相似文献
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Alonso-Santurde R Andrés A Viguri JR Raimondo M Guarini G Zanelli C Dondi M 《Journal of environmental management》2011,92(3):994-1002
The feasibility of recycling spent foundry sand in clay bricks was assessed in laboratory, pilot line and industrial trials, using naturally occurring sand as a reference. Raw materials were analyzed by X-ray fluorescence, X-ray diffraction, particle size distribution, and leaching and combined to produce bodies containing up to 35% wt. sand. The extrusion, drying and firing behaviour (plasticity, drying sensitivity, mechanical strength, bulk density, water absorption, and shrinkage) were determined. The microstructure, phase composition, durability and leaching (EN 12457, granular materials, end-life step, European Waste Landfill Directive; NEN 7345, monolithic materials, use-life step, Dutch Building Material Decree) were evaluated for bricks manufactured at optimal firing temperature. These results demonstrate that spent foundry sand can be recycled in clay bricks. There are no relevant technological drawbacks, but the feasibility strongly depends on the properties of the raw materials. Spent foundry sand may be introduced into bricks up to 30% wt. Most of the hazardous elements from the spent foundry sand are inertized during firing and the concentrations of hazardous components in the leachates are below the standard threshold for inert waste category landfill excepting for chromium and lead; however, their environmental risk during their use-life step can be considered negligible. 相似文献
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基于模糊概率的震害预测模型及其应用 总被引:7,自引:0,他引:7
将模糊数学中的模糊概率理论应用于震害预测之中,建立了模糊概率的震害预测模型.并应用此模型对单层砖排架柱厂房进行了震害预测;算例表明,该预测模型概念清晰,计算简单,效果较好. 相似文献
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机械加工作业十分普遍,通过对140名机加工工人的调查,发现手、腕、臂、肩、颈和上背的疼痛及腕、上臂和上背的压痛与对照人群比,P< 0.05差异明显,下背酸痛虽较对照人群高,但无统计学意义。这可能与机械加工时需取低头、颈前弯、上背前倾体位及勿需常弯腰等因素有关 相似文献
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对某地区机械制造业的安全状况进行调查,通过对整个行业的安全投入数据和事故数据的统计,分析了该行业的安全投入现状、事故发生现状及二间的关系,认为造成该行业事故多发的主要原因是安全投入不足和人均劳保费用偏低,提出了机械制造业提高生产安全水平的对策。 相似文献
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通过分析煤矸石堆积所带来的环境问题以及在煤矸石砖与传统的黏土砖进行比较的基础上,从经济效益、环境效益以及社会效益几个方面分析了煤矸石砖在生态建筑中的应用前景,说明了煤矸石砖在生态建筑中应用的市场潜力是无穷的。 相似文献
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