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71.
IEC61508标准指导城市轨道交通设备安全功能指标实施 总被引:1,自引:0,他引:1
IEC61508标准提出电气/电子/叮编程电子(E/E/PE)安全相关系统的功能安全,成为了电气/电子/可编程电子(E/E/PE)安全相关系统的功能安全的基本和核心标准。城市轨道交通设备越来越多地采用了电气/电子/可编程电子系统(E/E/PES),确保这些设备功能安全指标的落实是工程建设,以及运营安全的一个重要组成环节。 相似文献
72.
The long-term behavior of 90Sr was investigated from 1987 to 1997 in fifteen lakes in southern and central Finland following the 1986 Chernobyl accident. Both water and fish samples (perch, pike, vendace) were analyzed. 90Sr stays long in the freshwater ecosystem; the observed half-lives during the study period were generally around 10 years in water and even longer in fish. One lake exhibited very different behavior for 90Sr, with elevated levels in fish and water and very short observed half-life in fish, less than 2 years. Concentration factors of 90Sr in fish (Bqkg−1 f.w. in fish/Bqkg−1 in water) among the studied lakes significantly correlated with both the Ca concentration and electrical conductivity of the water. More 90Sr was transferred into fish in lakes with a low electrical conductivity and a low Ca concentration. Among other water parameters evaluated were pH, color, total nitrogen, and phosphorus. 相似文献
73.
机电产品可靠性研究与探讨 总被引:1,自引:0,他引:1
机电产品越来越广泛地应用于社会各个领域,随着自动化、小型化程度的提高,很多机电产品结构越来越复杂,并且其使用条件也越来越严酷,由此产生的产品可靠性问题必然越来越多,可靠性技术也越来越受到重视。本文针对机电产品,从可靠性管理、可靠性设计和分析、可靠性试验和评定三个方面,对可靠性研究工作进行初步探讨。 相似文献
74.
Applicability of grid-net detection system for landfill leachate and diesel fuel release in the subsurface 总被引:1,自引:0,他引:1
The grid-net system estimating the electrical conductivity changes was evaluated as a potential detection system for the leakage of diesel fuel and landfill leachate. Aspects of electrical conductivity changes were varied upon the type of contaminant. The electrical conductivity in the homogeneous mixtures of soil and landfill leachate linearly increased with the ionic concentration of pore fluid, which became more significant at higher volumetric water contents. However, the electrical conductivity in soil/diesel fuel mixture decreased with diesel fuel content and it was more significant at lower water contents. The electrode spacing should be determined by considering the type of contaminant to enhance the electrode sensitivity especially when two-electrode sensors are to be used. The electrode sensitivity for landfill leachate was constantly maintained regardless of the electrode spacings while that for the diesel fuel significantly increased at smaller electrode spacings. This is possibly due to the fact that the insulating barrier effect of the diesel fuel in non-aqueous phase was less predominant at large electrode spacing because electrical current can form the round-about paths over the volume with relatively small diesel fuel content. The model test results showed that the grid-net detection system can be used to monitor the leakage from waste landfill and underground storage tank sites. However, for a successful application of the detection system in the field, data under various field conditions should be accumulated. 相似文献
75.
Status quo of e-waste management in mainland China 总被引:2,自引:1,他引:2
Jinhui Li Baoguo Tian Tongzhou Liu Hao Liu Xuefeng Wen Shun'ichi Honda 《Journal of Material Cycles and Waste Management》2006,8(1):13-20
In China, the use and obsolescence of both electronic and electrical equipment have increased rapidly in recent years. China
has also begun to take measures to cope with this problem since it began experiencing a rapid process of industrialization
and urbanization in the 1990s. In this paper, the profile of the electrical and electronic waste (e-waste) problem in China
is depicted from such aspects as domestic e-waste and imported e-waste, along with their recycling systems, policies, and
regulations. Based on statistics of the consumption of major household appliances and personal computers, a forecast is made
of the numbers of obsolete major household appliances and personal computers. The results show that currently the number of
electrical and electronic products in use in China is tremendous. An investigation on household appliances and personal computers
in Beijing was made to assess the use and obsolescence of these products. Also, the legal issues relating to e-waste in China
are summarized, and these will be the juristic foundation for the solution of e-waste problems. 相似文献
76.
废水净化的电化学技术进展 总被引:24,自引:0,他引:24
从工程应用的角度,概述了废水净化电化学技术的发展现状,指出了当前存在的问题,展望了今后的发展方向。 相似文献
77.
78.
79.
电导率温度校正计算方法的改进 总被引:2,自引:0,他引:2
通过实验,用分段函数较精确的表示出温度校正系数与温度的关系,对现行电导率温度校正公式进行了改进,可以简化测量过程,提高计算精度。 相似文献
80.
近几年来,粒子电迁移率引起了更多学者的注意。因为它是表征带电粒子在电场中运动的重要参数之一。在这方面,人们已作了大量的研究工作,提出了一些计算粒子电迁移率的理论和半经验模型。基于前人的研究,本文提出了一种计算粒子电迁移率的新模型,并用前人的实验结果和本研究的实验结果对此模型进行了检验。计算结果和实验数据很吻合。就某种意义上讲,此模型是对以前模型的扩展和改进,它可广泛应用于溶胶的研究和工业应用。 相似文献