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     

IC卡处理系统及其实现

本文介绍了ＩＣ卡处理系统的基本组成，详述了一种ＩＣ卡处理系统的软硬件实现方法，说明了Ｉ＾２Ｃ总线在系统中的应用。     

基于LabVIEW的浑浊度数字化测试仪设计

本文将虚拟仪器技术与光频转换器件TSL230B相结合,设计新型浑浊度数字化测试仪.阐述该系统的工作原理、硬件构成及软件设计方案;实现浑浊度的自动在线测量.实验结果表明,该仪器数据处理能力强,图形化显示直观,保存与打印结果方便,测量的重复性好,精确度高.     

浅析发电企业生产项目招标的规范管理

本文分析了发电企业生产项目招标的现状、特点以及存在的问题，提出了完善和改进发电企业生产项目招标管理的一些措施，从而建立科学合理、规范的监督制度与运作程序，保证项目质量，提高经济效益。     

Stabilization of multiple independent linear systems with control networks

The problem of stabilizing multiple independent linear systems sharing one conmmon network cable is presented and solved. Both the quanfization and time sequencing are studied in the field of control over networks by providing the formulated stabilizing sufficient condition which illustrates the relationship between the system instability, quanfization and time sequencing, and the data rate is also presented in temps of the quanfization and time sequencing. A numerical example is given to illustrate the result.     

求解部分可观测马氏决策过程的强化学习算法

针对部分可观测马氏决策过程(POMDP)中，由于感知混淆现象的存在，利用Sarsa等算法得到的无记忆策略可能发生振荡的现象，研究了一种基于记忆的强化学习算法——CPnSarsa(λ)学习算法来解决该问题．它通过重新定义状态，Agent结合观测历史来识别混淆状态．将CPnSarsa(λ)算法应用到一些典型的POMDP，最后得到的是最优或近似最优策略，与以往算法相比，该算法的收敛速度有了很大提高．     

基于LM I 的广义系统正实反馈控制

建立连续情形广义系统新的正实引理，通过对线性矩阵不等式(LMI)的求解和系统的等价变换，给出了正实状态反馈控制的充分必要条件，构造了保持系统稳定性的正实控制器设计方法，数值实例表明，该求解控制器的方法简单方便，具有实际意义。     

分布式防火墙技术研究

介绍了分布式防火墙的产生、体系结构、主要特点及存在的问题.     

安钢高强板AH60的生产实践

本文论述了高强度低合金钢板AH60的试制过程，结合产品技术要求和生产实际设计合理的成分体系和工艺路线。     

济钢1 750 m3高炉薄壁炉衬操作技术

济钢1750m^3高炉采用砖壁合一的薄壁内衬结构。针对薄壁内衬高炉的技术特点，通过采取加强原燃料质量管理、重视上下部调剂、优化布料矩阵、控制合理的煤气流分布、完善冷却体系管理、控制合理操作炉型、狠抓设备点检等措施，高炉各项技术指标明显改善。