基于栅格法-模拟退火法的机器人路径规划

路径规划是机器人技术中的重要组成部分,分全局路径规划和局部路径规划。本文将栅格法与模拟退火法结合,采用栅格法表示环境信息。局部路径规划主要基于模拟退火法,使路径跳出局部极小点,到达目标位置。     

功率管焊接质量射线检测

介绍采用射线方法检测功率管芯片与基座之间的焊接质量。试验证明，选用合适的透照参数可使X射线照相和X射线实时成像对焊接部位的检测均得到较高的对比灵敏度，但X射线照相法成本低廉，一次可透照多个工件，效率高，为该功率管焊接质量的理想检测方法。     

分流液压转向牵引计算的展开图及其应用

本文论及分流液压转向牵引计算的概念,方法及其展开图,并且提供了计算机绘制的展开图和应用实例。     

An analytical expression for the power coefficient of an ideal horizontal-axis wind turbine

The paper shows that an analytical evaluation of the power coefficient C_p for an ideal horizontal-axis wind turbine can be made via an expression giving the direct relationship of C_p and the axial induction factor a. The results obtained agree closely with those obtained numerically from the usual integral expression involving several variables.     

Validation of a Three-Dimensional Computational Fluid Dynamics Model of a Contact Tank

A three-dimensional (3D) computational fluid dynamics (CFD) model of a contact tank is presented in this paper. The model results are compared against 3D velocities and flow through curve (FTC) data, representing a tracer concentration profile, from a 1:8 scale physical model. The objective is to demonstrate that CFD models can simulate both the FTC and the 3D velocity field quite well. Simultaneous validation of velocities and FTC is important in ascertaining the predictive capabilities of CFD models, as physical model studies indicate that different baffle arrangements can lead to similar FTCs. Therefore, a good prediction of only FTC, as presented in previous 3D CFD model studies, does not necessarily imply a correct simulation of the flow field.     

Lifetime control in silicon power P-i-N diode by ion irradiation: Suppression of undesired leakage

The irradiation with high-energy (7.35 MeV) protons through a set of energy degraders was used to suppress leakage of the silicon power diodes subjected to local lifetime control. The aim was to modify the profile of recombination centers and to reduce production of vacancy complexes. The high-energy proton irradiation was compared with standard local lifetime killing by high-energy alphas. Recombination centers arising from irradiation were characterized after irradiation and subsequent annealing at 220 and 350 °C by deep level transient spectroscopy and I-V profiling. Static and dynamic parameters of irradiated diodes were also measured and compared. Results show that the applied irradiation with protons provides 3-10 times lower leakage compared to standard alphas for equivalent reduction of the reverse recovery current maximum. On the other hand, the excessive formation of hydrogen donors at high proton fluences and their diffusion during annealing at 350° decreases diode blocking capability.     

A new voltage control equipment using fuzzy inference

Power system control equipment needs higher sensitivity and operational reliability. Advanced voltage control equipment is needed for reducing the frequency of tap changes and improving the characteristics (the relationship between the actual voltage and reference voltage) of the voltage to meet today's power system requirements. However, these objectives are in a trade-off relationship. Studies of voltage control derived from a knowledge base suitable for electric power systems can satisfy these objectives using fuzzy inference. Compared with corresponding conventional equipment, the new equipment improved the deviation of 30 min average voltage of 30 percent. This paper describes the design concept of new voltage control equipment using fuzzy inference. In addition, field test results are described along with rules of fuzzy inference, membership functions, and the deviation of 30 min average voltage through detailed simulation.     

兴企之要 惟在用人

阐述了人力资源管理在企业发展中的重要作用;对如何引入竞争机制、知人善任、建立科学的激励机制和约束机制、改革管理体制等方面进行了论述。     

基于XML的构件化企业模型描述及应用

当今世界Internet/Intranet技术的迅速发展，对企业建模也提出了网络化的要求。而当前众多的建模工具都还没能适应这一要求，或是才开始起步。鉴于这种状况，提出了基于XML技术的描述构件化模型的思想，以对当前已经比较成熟的建模技术进行XML的改造，讲述如何实现基于XML的构件化企业模型描述及应用。