海上石油平台无线视频监控系统的建立

介绍了埕岛油田无线视频监控系统,提出了在自然环境恶劣的条件下实施无线视频监控系统的必要性和给安全生产带来的益处,并对分步式无线视频监控系统的特点进行了阐述.     

列车垃圾:铁道沿线的老公害

据调查,每名旅客乘车一天,产生“流动垃圾”250克;一列旅客列车运行一天,平均产生“流动垃圾”0．5吨;全国每天产生列车垃圾近500吨,相当于一个省会城市日产垃圾量的一半。     

新苦恼--办公室综合症

究显示：办公室工作人员正遭受“办公室综合症”的困扰,经常性长时间工作、杂乱的办公桌以及错误的坐姿是导致这种新的上班族病发生的主要原因。     

撇油器的原理及性能

溢油回收装置的有效使用是降低和消除溢油污染的重要手段。比较了撇油器的各种原理、性能及操作条件。     

行星传动起升机构飞车原因分析

建立行星传动起升机构电动机飞车的模型,计算电动机失电后各瞬间重物的速度、加速度,电动机的转速,从而分析事故的原因。     

造船用双角钢式脚手架的危险点电测

对角钢式脚手架进行应力测试和理论计算研究.采用电测法测试了危险截面的应力大小及分布规律.结果表明,2、4测点是危险点;采用斜弯曲理论进行理论计算,所得结论与实验测试是一致的,其中2点受拉应力作用.上述分析为脚手架的设计、制作和安全使用提供了强度分析依据.同时还对脚手架其他安全问题进行了讨论.     

滑坡稳定性计算中剩余推力法和简布法

从剩余推力法和简布法基本原理出发．分析了两种计算方法的不同假设条件,并结合实例,对滑坡稳定性进行了计算,最后对两种计算结果进行了分析与比较,得出了剩余推力法计算的稳定性系数总是比简布法计算的要偏大、用剩余推力法计算稳定性时水的影响比地震要稍大以及用简布法计算稳定性时水的影响比地震要稍小的结论。     

Experimental study on the influence mechanism of gas seepage on coal and gas outburst disaster

By using the self-developed triaxial servo-controlled seepage equipment for thermo-fluid-solid coupling of coal containing gas and the self-developed coal and gas outburst simulation test device, experiments to study the influence mechanism of gas seepage on coal and gas outburst disasters. The results show that: (i) gas seepage decreases the strength of coal containing gas and accelerates its failure process; (ii) under the same gas pressure, the confining pressure is larger, the more difficult the gas flows and the greater the intensity of coal containing gas is; (iii) in the process of coal and gas outburst, the greater the vertical ground stress is, the more powerful the outburst will be; (iv) the influence mechanism of gas seepage on coal and gas outburst disasters is as follows: firstly, gas seepage weakens the mechanical properties of coal body, which makes it much easier for coal and gas outburst to occur; secondly, on the same effect of external force, it will be easy to form a high gas pressure zone in the coal body under the difficult condition of gas seepage, and accumulate more gas compression energy, which is the energy source for coal and gas outburst, and it is also the main dynamic source to throw and grind the coal.     

Methodological application of system dynamics for evaluating traffic safety policy

System dynamics (SDs) is a methodology that can be used to understand the behavior and dynamics of complex systems over time. SD utilizes a range of tools and techniques such as influence and causal loop diagrams, computer simulation and optimization. SD has been used to facilitate the analysis of complex physical and social systems, e.g. water resources, climate change and industrial accidents. One of the key reasons for its growing popularity is that it allows policy experimentation and facilitates the discussion of ‘what-if’ scenarios. Within the realm of road traffic research, SD has been primarily used to examine micro level issues such as the interactions between the driver, infrastructure and the vehicle. Even though such micro level analysis are important, macro traffic safety policies can create more sustainable systems that pre-empt safety issues and reduce likelihood of traffic accidents. This paper develops two models to demonstrate how the methodology of SD can facilitate and encourage macro and meso level analysis of traffic safety policy. The first model is used to assess policy options so as to encourage the purchase of cars with higher safety ratings. The second model, is used to evaluate the impact of public transport policies on travel time and traffic safety considerations. The strength and weaknesses of the SD methodology in road transport/safety analysis are also examined. It is suggested that SD is most appropriate for formulating macro level policy as it can account for the dynamic complexity associated with the road transport system.     

矿用聚氨酯注浆材料阻燃及加固性能研究

为获得压缩强度和阻燃性能兼顾的聚氨酯注浆材料,通过L9(34)正交试验,研究Mg(OH)2含量、甲基膦酸二甲酯(DMMP)含量、异氰酸酯指数、辛酸亚锡含量对聚氨酯注浆材料的阻燃性能及压缩性能的影响。获得这种聚氨酯注浆材料的最佳制备条件。对比分析最佳制备条件试样及不加阻燃剂试样的热稳定性。结果表明:DMMP含量和Mg(OH)2含量对平均燃烧时间影响显著;Mg(OH)2还有补强加固作用,对压缩强度影响最为显著,其次为异氰酸酯指数。在Mg(OH)2,DMMP,辛酸亚锡质量分数分别为16%,24%和0.4%,异氰酸酯指数为1.10时,聚氨酯注浆材料兼顾阻燃性能和压缩性能,平均燃烧时间为13.9 s,压缩强度为19 MPa,其热稳定性明显优于不添加阻燃剂样品。