用分布式防火墙构建网络屏障

本文介绍了分布式防火墙的结构,工作原理和实现策略.分析了分布式防火墙对各类问题的解决机理.最后作者指出了分布式防火墙存在的一些问题.     

精馏意识在空分系统操作中的运用

介绍精馏意识在空分系统操作中运用 ,举例说明了一种从全局角度考虑问题的方法 ,使操作更有预见性 ,保持精馏工况的稳定性。     

人本管理的有效应用

世界经济在经历争夺市场、争夺资源之后,人才成为各国、各企业争夺的焦点,人才资源以更快的速度呈现国际化趋势.实施有效的人本管理可以使企业吸引和留住人才.     

10kV真空断路器的分析

10 kV真空断路器在我国已经大量地生产和使用.本文以ZW27-12为例,简要说明真空断路器的原理与维修.     

非线性负荷电能计量的准确性研究

介绍了几种方法 ,用以消除或减小计量方式和谐波对电能量的计量方面带来的负面影响 ,使电能计量更加准确、公正和合理     

Preparation of CaS∶Eu~(2 ), Sm~(3 ) by Solid Reaction Method and Its Photostimulated Luminescence

Thereisanurgentneedonopticalstoragemateri alswiththedevelopmentoflaserandopticalstoragetechnologyinrecentyears .Electrontrappingopticalstoragematerials (ETM )isanewtypeofopticalstor agematerials .Theybasicallyarewide band gapⅡ Ⅵsemi conductorcompoundsdopedwithtwotypesofselectedrareearthelementsthathavegroundstatesandexcitedstateswithinthewidebandgapoftheⅡ Ⅵsemiconductorcompoundhostmaterials .Lighten ergyisstoredinthiskindofmaterialbyexposingittoultravioletorvisiblelightandisreleasedthro…     

Investigation of Structure and Hydriding Properties of La0.6 Nd0.4 Ni4.8 Mn0.2 Cux Alloys

The structure and hydriding performance of La0.6Nd0.4Ni4.8Mn0.2Cux (x = 0 ～ 0.4) alloys were investigated in order to develop suitable materials for metal hydride air conditioner. The effect of Cu addition on the crystal structure,equilibrium pressure, hydrogen capacity and hysteresis as well as hydrogen absorption/desorption kinetics were systematically studied by using the measurement of P-C isotherms, X-ray diffraction and scanning electron microscopy. As the amount of Cu increases, the plateau pressure increases and hydrogen absorption/desorption kinetics is improved, but the effective hydrogen storage capacity decreases. It is shown that variations in the basal plane parameter a can be used as an indication for the plateau pressure changes. With the increase of parameter a, the plateau pressure decreases. For La0.6 Nd0.4Ni4.8Mn0.2Cux(x = 0 ～ 0.4) alloys there is a relationship between the effective hydrogen storage capacities and the ratios of their unit cell parameters c and a. The effective hydrogen storage capacity decreases with increase of a/c.     

基于H∞控制器的柔性机械手优化设计研究

针对柔性机械手设计中手臂变形涉及的柔性和参数分布式系统的复杂性,采用H∞控制技术对柔性机械手进行优化设计。在设计过程中,考虑了参数分布式系统中各子系统之间的相互作用,分析了模型的不确定性并进行了定量描述,导出了广义装置的空间状态方程。设计了具有稳定闭环的H∞控制器,减小了系统的不确定性和扰动所产生的各种影响,从而解决了控制问题和模型精度问题。对阶跃输入和扰动的响应进行了研究,给出了各种情形的数值结果,显示系统具有良好的鲁棒性。