用LWR学习进行乒乓球轨道预测的仿真研究

乒乓机器人的任务是将球击回到对方的场地内．这个任务由两部分组成：知觉和行动．本文研究机器人的知觉问题，也就是利用ＬＷＲ（ＬｏｃａｌｙＷｅｉｇｈｔｅｄＲｅｇｒｅｓｓｉｏｎ）学习的方法预测接触反弹后的球的轨道．     

电力电容器的相控技术

讨论分析了电力电容器连续相控（ＴｈｙｒｉｓｔｏｒＣｏｎｔｒｏｌｌｅｄＣａｐａｃｉｔｏｒ）ＴＣＣ新技术。其中主要阐崐述了ＴＣＣ技术的工作原理、波形分析结果和谐波抑制方法。     

Low-threshold vertical-cavity surface-emitting lasers based onoxide-confinement and high contrast distributed Bragg reflectors

The interest in low-threshold vertical-cavity surface-emitting lasers (VCSEL's) is increased by the demonstration of the small size, low loss optical mode due to oxide-confinement in the Fabry-Perot microcavity laser. Intense recent work in this area has resulted in numerous record breaking demonstrations of low-threshold current, high wall-plug efficiency, and high speed. In this paper, we discuss the impact of the dielectric cavity design to enhance control of the optical mode. We argue that high contrast dielectric mirrors can become an important design approach, especially for small apertures limited by diffraction loss. Experimental results are compared for different types of mirror and aperture designs     

创造绿地型国际性花园城市——深圳特区绿地系统规划设计探讨

从深圳生态环境与现有城市绿地系统特点、深圳建设绿地型国际性花园城市的优势和绿地系统规划设计思路等三个方面扼要介绍了深圳特区的绿地系统规划设计方案．     

高精度七米激光测长机的误差补偿技术

简要介绍一笔者研制的大型计量测试仪器－“高精度七米激光测长机及其计量管理系统”的工作原理，详细地介绍了其测量过程中采用的误差补偿技术并进行实验验证。     

基于边界表示的曲面实体造型系统的数据结构

实体造型是ＣＡＤ系统的核心模块，而二次曲面在工程中常用来描述轴，孔及圆角等形状特征。讨论了在微机上实现的一个基于边界表示的实体模型的数据结构，并针对二次曲面的特点，实现了对自封闭曲面的无二义性拓扩定义，为顺利进行曲面的拼合运算打下了基础。     

钢筋混凝土环形截面构件受弯时强度计算

空心圆形电柱在安装时可能受到弯曲作用，其强度计算，是在做了合理假定后推导力学方程式。求解方程式并非易事，即使使用计算机也只是试算求解，或采用图解法。本文给出求解联立方程组的计算方法。     

A flexible and recoverable client/server database event notification system

A software architecture is presented that allows client application programs to interact with a DBMS server in a flexible and powerful way, using either direct, volatile messages, or messages sent via recoverable queues. Normal requests from clients to the server and replies from the server to clients can be transmitted using direct or recoverable messages. In addition, an application event notification mechanism is provided, whereby client applications running anywhere on the network can register for events, and when those events are raised, the clients are notified. A novel parameter passing mechanism allows a set of tuples to be included in an event notification. The event mechanism is particularly useful in an active DBMS, where events can be raised by triggers to signal running application programs. Received July 21, 1995 / Accepted May 30, 1996     

A novel integrated silicon capacitive microphone-floating electrode“electret” microphone (FEEM)

A novel principle “electret” microphone, i.e., floating electrode electret microphone, is proposed and implemented in this study. Single-chip fabrication and corrugation technique are used in the design and fabrication of the microphone. The floating electrode is encapsulated by highly insulated materials to ensure that there is no electric-leakage passage between the floating electrode and the electrodes of the microphone. Net-free electronic charges (not “bonded” charges as in traditional electret) in the floating electrode can excite the electric field, which is similar to that of the traditional electret. The floating electrode can be easily charged by use of the “hot” electron technique, available using the avalanche breakdown of the p⁺-n junction. Therefore, the electret microphone is rechargeable, which can greatly increase the lifetime of the device. The preamplifier has been on-chip integrated in a junction-field-effect transistor (JFET) source-follower type with resistors by use of ion implantation. Electret charges are banded in a deep potential trap, thus, this microphone can operate at a high temperature (as high as 300°C) and has high stability and reliability. Experiments show that the prototype has a 3-mV/Pa sensitivity and a larger than 21-kHz frequency bandwidth in a 1 mm ×1-mm diaphragm area. Microphone performance can be further improved by optimized process and design. The fabrication is completely integrated-circuit (IC) compatible, hence, the microphone shows promise in integrated acoustic systems     

碳酸铅纳米粉体的制备与表征

以醋酸铅和碳酸钠为原料 ,选择优化的工艺条件 ,用化学沉淀法制备分散性良好的碳酸铅纳米粉体。XRD和TEM分析表明 ,纳米碳酸铅属斜方晶系 ,其颗粒呈球形 ,粒度分布均匀 ,为5 0nm左右。