Internet网络低层编程及Java实现

探讨如何通过因特网通信，以及Java用以辅助此类编程的一些类。网络程序的设计要求相互间更有效率地沟通。Web网页的广泛使用，编程效率提升后影响最大的就是Web。网络程序设计以前非常困难，而Java使这个问题迎刃而解。它解决了一些真正有些难度的复杂问题：跨平台程序、动态代码改换以及安全保护等等。     

Simulation Study of Aspects of the Classical Hydrogen Atom Interacting with Electromagnetic Radiation: Elliptical Orbits

The present study examines the behavior of a classical charged point particle in near-elliptic orbits about an infinitely massive and oppositely charged nucleus, while acted upon by applied electromagnetic radiation. As recently shown for near-circular orbits, and now extended here to the elliptical case, rather surprising nonlinear dynamical effects are readily produced for this simple system. A broad range of stability-like conditions can be achieved by applying radiation to this classical atom. A perfect balance condition is examined, which requires an infinite number of plane waves representing harmonics of the orbital motion. By applying a scale factor to this radiation, stability-like conditions are produced where periodic variations in semimajor and semiminor axes occur for extended periods of time, before orbital decay eventually takes over due to the effects of radiation reaction. This work is expected to lead to both practical suggestions on experimental ideas involving controlling ionization and stabilization conditions, as well as hopefully aiding in theoretical explorations of stochastic electrodynamics.     

ULTRA‐FINE TRACKING CONTROL ON PIEZOELECTRIC ACTUATED MOTION STAGE USING PIEZOELECTRIC HYSTERETIC MODEL

The tracking control accuracy of the piezoelectric actuator (PEA) is limited due to its inherent hysteresis nonlinearity. A new piezoelectric‐actuator model is synthesized based on two first‐order transfer systems in parallel with two tuned parameters determined from one experiment. Two open‐loop tracking controllers are implemented with the proposed model to compensate the hysteresis of linear positioning. Numerical simulations and experimental tests on the tracking of sinusoidal and triangular waveforms with signal frequencies ranging from 1Hz to 30 Hz are revisited and compared with the conventional Bouc‐Wen and Duhem models. Experimental results reveal that the RMS tracking error can be reduced to less than 2% of the maximum traveling distance without any feedback sensor. When a piezoelectric actuated on a two Degree‐Of‐Freedom (DOF) monolithic motion stage was employed, the RMS tracking error was 50 nm within the measured sensor accuracy.     

测量雷达天线座轴系精度分析

本文分析了影响测量雷达天线座轴系精度的一主要因素,为轴系设计提供参考。     

线阵CCD在安瓶三径在线自动检测分选系统中的应用

阐述了用线阵CCD检测系统通过变速扫描实现安瓶三径在线检测与控制的应用研究。文中用变速扫描方案，使在满足系统测量精度和高速的条件下，大大降低了对线阵CCD器件和扫描伺服系统性能的要求，使系统更具有实用价值。     

消失模铸造铸铁件水基涂料的研制

选用石英粉为耐火骨料，酸式磷酸盐为粘结剂，通过正交试验确定了铸铁件消失模水基涂料的最佳配比。经测试和生产验证，其性能良好，能很好地适应生产要求。     

用于空气净化的电除尘理论分析

论述了电除尘器用于工业除尘与空气净化时的差异,分析了电除尘器效率公式以及有效驱进速度等要点,讨论了电除尘器设计中的类比方法。     

计算机控制与检测气动换向阀试验台

介绍一种采用计算机控制与检测气动换向阀试验台的特点和测试系统设计。     

人工神经网络在交流传动控制中的应用

综述和分析了人工神经网络在交流传动控制中的应用 ,提出了有待解决的问题 ,对今后的发展趋势进行了展望。