Recent development of TiNi-based shape memory alloys

Recent developments in China on TiNi-based shape memory alloys (SMAs), including TiNi binary SMAs, TiNiNb wide hysteresis SMAs, TiNiCu narrow hysteresis SMAs, TiNiHf high temperature SMAs and TiNiRE SMAs were concisely reviewed. The damping characteristics and corresponding mechanisms of TiNi and TiNiNb alloys were described and discussed. Some surface modifications of TiNi binary alloys were employed to improve the corrosion resistance and the biocompatibility, which are very useful for the medical applications. Shape memory effect and mechanical properties of TiNiHf alloys were enhanced by aging Ni-rich TiNiHf alloys, while the Ms still remain enough high. The authors found that the addition of RE to TiNi alloys increases the phase transformation temperatures and even changes the transformation sequence. Fundamental research on the TiNi-based alloys is still in the ascendant, leading to increasingly extending of the applications.     

Direct solution of ill‐posed boundary value problems by radial basis function collocation method

Numerical solution of ill‐posed boundary value problems normally requires iterative procedures. In a typical solution, the ill‐posed problem is first converted to a well‐posed one by assuming the missing boundary values. The new problem is solved by a conventional numerical technique and the solution is checked against the unused data. The problem is solved iteratively using optimization schemes until convergence is achieved. The present paper offers a different procedure. Using the radial basis function collocation method, we demonstrate that the solution of certain ill‐posed problems can be accomplished without iteration. This method not only is efficient and accurate, but also circumvents the stability problem that can exist in the iterative method. Copyright © 2005 John Wiley & Sons, Ltd.     

Boundary element‐free method (BEFM) for two‐dimensional elastodynamic analysis using Laplace transform

In this paper, we present a direct meshless method of boundary integral equation (BIE), known as the boundary element‐free method (BEFM), for two‐dimensional (2D) elastodynamic problems that combines the BIE method for 2D elastodynamics in the Laplace‐transformed domain and the improved moving least‐squares (IMLS) approximation. The formulae for the BEFM for 2D elastodynamic problems are given, and the numerical procedures are also shown. The BEFM is a direct numerical method, in which the basic unknown quantities are the real solutions of the nodal variables, and the boundary conditions can be implemented directly and easily that leads to a greater computational precision. For the purpose of demonstration, some selected numerical examples are solved using the BEFM. Copyright © 2005 John Wiley & Sons, Ltd.     

基于CAN总线的智能电源系统

设计了一种基于CAN总线的智能电源系统.该设计中利用了CAN总线的抗干扰性强、传输距离远、接线简单、传输速率高、系统中节点数多的特点,将CAN总线应用于电源模块、电源系统的设计中,有效地解决了以往电源系统中所存在的输出单一、系统可扩展性差的缺点.该电源系统已经成功地应用于某军用飞机的测试系统中.     

单总线温度湿度复合传感器的设计

利用集成湿度传感器HiH3610测得相对湿度,用多功能芯片DS2438获得工作电压和温度补偿数据,采用AT89C52单片微机进行误差补偿计算,设计了一种新型单总线温度、湿度复合传感器。并完成了人机接口和PC机通信。该传感器湿度测量范围为0～100%RH,准确度为±2%RH;温度测量范围为-40～125℃,准确度为±0.5℃。     

非直线排列剥叶元件的疲劳寿命分析

阐述了整杆式甘蔗收获机械非直线排列剥叶元件疲劳分析的总体思路．利用计算机仿真分析的方法分析了剥叶元件装夹参数及其注塑加工过程中产生的缺陷对元件寿命的影响，提出了不同工况剥叶元件疲劳分析的有限元计算模型．通过仿真分析，方便、快捷地得出剥叶元件疲劳寿命预估值，并用试验证明了其有效性．     

虚拟制造环境下VE型分配泵的研发

介绍了虚拟制造技术及其分类，探讨了以设计为中心的虚拟制造技术在汽车零部件研发中的实践．利用该技术，以柴油发动机VE型分配泵为研究对象，重点分析了传动部件易断裂问题，研究内容涉及产品全生命周期的各个阶段，包括虚拟样机设计、虚拟样机运动学动力学仿真、虚拟装配、有限元分析和零件虚拟加工仿真等，并对研究结果进行了实验验证．结合企业实际，给出了解决方案．     

一种智能仪器仪表的通用人机接口方案

讨论了智能仪器仪表人机接口的交互式方案，将LCD显示屏划分为运行模式、预置参数、运行参数、提示信息等4个显示区，采用优先权编码器作为键盘编码器，按键读数直接送至MCU，实现了占用单片机I／O口线少、占用单片机机时少、简化相应程序等最优设计。     

关于会计电算化中会计分录编制问题的探讨

探讨了会计电算化条件下和传统手工会计条件下几种有重大差异的会计分录编制问题，指出实现会计电算化后，会计人员在编制会计分录时，既要遵循会计理论本身要求，又要考虑会计电算化软件的要求。     

浅谈现代人才测评

人才测评在许多人事领域被广泛运用，本文阐述了人才测评的历史沿革，现代人才测评的形成、发展和运用，对现代人才测评技术的先进性等作了初步的探讨，以期帮助人们对现代人才测评有较为完整的了解。