Application of Code Approach for Emergency Evacuation in a Rail Station

This paper presents an emergency evacuation analysis during a mid-platform train fire in an underground rail station. A time-based evacuation scenario is developed taking into account the stairway inaccessibility due to smoke blockage. The calculation approach in NFPA 130 is then applied to a parametric study of this time-based scenario and its reliability is examined using a micro-simulation model. Both methods give consistent predictions of the exiting times. The results demonstrate that with the division of the station into two zones, the exiting time could not meet the code requirements, whereas it does meet the required exiting time without the division. Such division is due to smoke blockage and creates an uneven ratio of the occupant load to the available exiting capacity. This shows that appropriate consideration of the fire and smoke effects is important for station egress evaluation. Other issues such as the fire growth rate and the pre-evacuation time are also discussed.     

Damaged layer characteristics in micro-endmilling of copper using an ultrahigh-speed air spindle

This paper presents an investigation on the characteristics of damaged layer in micro-machining by using the ultrahigh-speed air spindle. The damaged layer in metal cutting is derived from plastic deformation and transformation of metal structure. In this study, micro-cutting force, surface roughness, and plastic deformation layer according to the variation of machining conditions were investigated by experiments. The damaged layer was measured using optical microscope for the samples prepared by metallographic techniques. Its scale was dependent on cutting process parameters, especially feed per tooth. According to experimental results, it was verified that the thickness of damaged layer was increased with increasing of feed per tooth and cutting depth, also thickness of damaged layer was reduced in down-milling compared to upmilling during micro-endmilling operation.     

广东地区燃气空调应用的可行性研究

本文以2005年中国大面积拉闸限电现象和广东2006年LNG工程初期投入使用为引，通过供电数据分析了夏季电空调高峰而造成的电力负荷急速增长所带来的恶果，在论述燃气空调特点的基础上，评述了燃气空调发展的必要性以及燃气空调对中国电力工业和燃气事业健康发展的双重作用，并通过燃气空调和电空调的技术经济对比，并以深圳市某科技园区为例，列表比较使用电离心机空调和燃气空调的各种费用，指出燃气空调在经济性和环保等各方面相对电空调有无法比拟的优势。     

浅谈图书馆网站的建设

对我国现阶段公共图书馆网站的总体情况进行了分析和概括 ,列举了具有代表性的几个网站的主要特点 ,指出了存在的问题 ,提出了相应的对策 ,强调了网站建设首先应有以读者需要为依归的理念 ,并将之贯穿在网站的内容设置和页面设计的整个过程中。     

ZJ510L-B汽车用高强度热轧板的试制

珠钢150t电弧炉-LF(VD)-CSP(紧凑式带材生产)流程试生产的5～8mm ZJ510L-B(0．16C--1．22Mn)汽车用高强度热轧板的铁素体晶粒尺寸为6．0～9．2μm，带状组织为1．5～2．5级，强度极限σb562～610MPa，延伸率δ5 32．0％～38．6％。文中还分析和提出了带状组织的形成原因和改进措施。     

基于ASK无线数传模块的新型安防系统

将无线数传模块和具有低噪声的策控制电路集成设计为一体，构成检测信号和开关量控制信号无线传输的功能模块，并将该模块嵌入到探头和控制器内部，建立无线通讯子网，应用于智能能楼宇安防系统。很好的解决了无线信息冲突问题。经过试运行，系统工作稳定，无线探头报警可靠性达到了使用需求。     

Bias-temperature instabilities of polysilicon gate HfO/sub 2/ MOSFETs

Bias-temperature instabilities (BTI) of HfO/sub 2/ metal oxide semiconductor field effect transistors (MOSFETs) have been systematically studied for the first time. NMOS positive BTI (PBTI) exhibited a more significant V/sub t/ instability than that of PMOS negative BTI (NBTI), and limited the lifetime of HfO/sub 2/ MOSFETs. Although high-temperature forming gas annealing (HT-FGA) improved the interface quality by passivating the interfacial states with hydrogen, BTI behaviors were not strongly affected by the technique. Charge pumping measurements were extensively used to investigate the nature of the BTI degradation, and it was found that V/sub t/ degradation of NMOS PBTI was primarily caused by charge trapping in bulk HfO/sub 2/ rather than interfacial degradation. Deuterium (D/sub 2/) annealing was found to be an excellent technique to improve BTI immunity as well as to enhance the mobility of HfO/sub 2/ MOSFETs.     

纳米Fe粉的制备研究

总结了纳米Fe粉的制备方法,重点介绍了一种新的制备方法——封闭循环氢还原法。该方法以FeSO·47H2O和NaOH为原料,采用沉淀方法制备粒径为30～70nm的Fe2O3粉末,其反应条件为:反应温度50℃,反应终点pH值大于12,陈化时间1h。用封闭循环氢还原法,在400℃下还原Fe2O3得到了Fe粉。其粒径在20～50nm之间,含量为99.16%。     

基于多代理技术的传感器管理系统

针对分布式对空监视网中混合式传感器管理结构存在的问题，提出了基于多代理技术的混合式传感器管理结构。该结构较好地克服了混合式管理结构中在融合中心存在的瓶颈问题，通过多个传感器代理、融合中心代理之间的相互协商来实现传感器任务的分配。传感器代理与传感器相结合使传感器的工作模式实现高度的自动化和模块化，便于传感器的灵活组网。