The pumping performances of the turbomoleculae pump simulated by direct simulation monte carlo method

Turbomolecular pumps (TMPs) are used extensively in several highly important areas of industry and research. The performances of TMP are evaluated by maximum throughput and maximum pressure ratio. In this paper, they are investigated by DSMC method. A 3D analysis in a rotating reference frame is proposed to simulate this flow field. Considering the Coriolis and centrifugal accelerations, the equations about the molecular velocities and position are deduced. The VSS model and NTC collision schemes are used to calculate the intermolecular collisions. The diffuse reflection is employed on the molecular reflection from the surfaces of boundary. The procedures for establishment of the correct collision rate are based on the cells, while individual collision pairs are chosen from the sub-cells. The pump performances of one stage TMP under the different kinds of gas, different heights, and different blade angles are simulated and the results are analyzed. Numerical results agree well with the existing experiment data.     

锡钢电力负荷节能软件装置-DSM的应用

钢厂等主要用电单位的峰值负荷造成电力资源浪费、供电紧张及企业自身高成本用电。锡钢集团电力负荷需求侧控制(DSM)项目，应用“趋势分析”原理，通过调控主要用电设备电弧炉的手段，使用电负荷均衡运行，从而使电力负荷(需量)下降5022 kW(10％)左右，对用电大户负荷控制(DSM)，节约用电费用，缓解城市供电压力，提供了有益的途径。     

A Virtual System for Vision Based SPC

A virtual system for vision based SPC (Statistical Process Control) is explored and constructed in this article for the purpose of the preliminary tests. Its performance is compared with that of a real vision system in a case study. The similarity between the virtual and real systems is examined with a chi-square test and an X chart experiment. The results suggest that the virtual system can be used to replace the real system in the preliminary test. The virtual system has many advantages, such as low cost, easy setup, wide adaptability, and being heuristic in nature. The use of the virtual system may help promote the applications of vision system to SPC.     

建立液压系统信息模型的研究

所设计的液压系统信息模型将液压系统分作系统、元件和油口3个层次，以多层链表的方式将其连接起来，能简单地与液压系统一一对应。而使用液压系统信息模型的整个仿真系统也分为3层，以信息模型为核心，向上层映射为数学模型，向下层映射到数据库。研究结果表明：所采用的体系结构弹性足，构造灵活，不但能满足液压仿真的需要，而且对系统的扩展性、对多方应用间信息集成都有着良好的支持。     

用硫酸铝废料处理冲灰水

江南电厂冲灰水存在着pH值超标、细灰难沉淀的问题．经试验，在冲灰水中加入含硫酸的硫酸铝废料，有效降低了冲灰水的pH值和悬浮物的含量，同时又解决了硫酸铝厂的废料处理问题，达到了双赢的效果。     

网络制造产品电子交易平台设计与研究

在电子商务环境中，多媒体数字作品很容易被非法复制和传播，无疑妨碍了电子商务的应用与发展。如何使网络制造产品在网上直接交易也是电子商务的一个重要课题。针对以上问题，提出了一种基于数字水印技术和公平交易协议的网络制造产品电子交易方案。该方案具有对数字产品的版权保护和交易的公平性特点。     

高性能混凝土配合比设计的试验研究

从对HPC组成、结构的认识出发，借鉴利用拨开系数求砂率的方法，提出了一种新的HPC配制方法，并通过试验证实该方法是完全可行的．     

华北地台晚古生代煤中微量元素及As的分布

研究了华北聚煤盆地晚古生代煤中微量元素，并与全国和西南地区煤中微量元素含量进行了对比。还研究了煤的区域地球化学特征，在华北地台划分了3个煤区域地球化学带，绘制了山西组和太原组煤中As等元素的分布图。结果发现，除个别微量有害元素（如Ni,U,Cl,Mo,Cu,Zn)在局部地区富集外，华北聚煤盆地晚古生代煤中微量有害元素含量较低。整体上不足以对环境和人体造成危害（燃煤产物及其危害性尚值得深入研究）；As的区域分布和古地理环境及煤岩煤质特征相吻合，指出华北地台晚古生煤中微量元素的分布总体上主要受控于聚煤古环境，其分布具有南北分带，东西延展的特征。     

一种新型叶尖定时信号高精度处理技术

提出一种新型叶尖定时信号高精度处理方法。采用固定频率脉冲填充方法，并基于CPLD、FIFO、EPP的融合技术，实现10ns的叶尖定时分辩力。利用CPLD设计了24位高速同步计数锁存电路，引入光通信用放大芯片设计了高灵敏度、宽频带光电接收预处理电路，并设计了高速EPP接口电路及软件。在实验室条件下对处理系统进行了功能验证，实验证明该系统可以实现0．4μw的弱光检测。     

Rocking stiffness of mounting arrangements in electrical cabinets and control panels

Several studies have shown that the consideration of a rigid body-rocking mode in a cabinet is necessary to evaluate accurate incabinet spectra. Observations from finite element analyses are used to study cabinet rocking behavior and to show that accurate representation of the boundary conditions at the cabinet base is essential in the evaluation of correct rocking mode. Simple formulations for evaluating the rocking stiffness are developed by conducting detailed analytical studies for three different types of cabinet mounting arrangements. Availability of these formulations enables incorporation of a cabinet rocking mode in the Ritz vector approach [Nucl. Eng. Des. 190 (1990) 225] for evaluating the cabinet dynamic properties in significant mode and for generating the incabinet response spectra.