高可靠镀Ni／Au工艺及其在微波PTFE电路上的应用

介绍了高可靠电镀Ｎｉ／Ａｕ工艺在ＰＴＦＥ微波印制电路上的应用，并分析了氨基磺酸盐镀软镍和亚硫酸盐镀软金工艺的影响因素及提高Ｎｉ／Ａｕ镀层之间附着力的措施。通过实验及应用证明了与直接镀金工艺相比，在软基材ＰＴＦＥ敷铜箔板上镀Ｎｉ／Ａｕ工艺能大大提高微波电路的可焊性，高温稳定性和长期可靠性，并且用其所制作的微波器件的高频性能也优于直接镀金工业。     

A Low-Power Wide-Dynamic-Range Analog VLSI Cochlea

Low-power wide-dynamic-range systems are extremely hard to build. The biological cochlea is one of the most awesome examples of such a system: It can sense sounds over 12 orders of magnitude in intensity, with an estimated power dissipation of only a few tens of microwatts. In this paper, we describe an analog electronic cochlea that processes sounds over 6 orders of magnitude in intensity, and that dissipates 0.5 mW. This 117-stage, 100 Hz to 10 KHz cochlea has the widest dynamic range of any artificial cochlea built to date. The wide dynamic range is attained through the use of a wide-linear-range transconductance amplifier, of a low-noise filter topology, of dynamic gain control (AGC) at each cochlear stage, and of an architecture that we refer to as overlapping cochlear cascades. The operation of the cochlea is made robust through the use of automatic offset-compensation circuitry. A BiCMOS circuit approach helps us to attain nearly scale-invariant behavior and good matching at all frequencies. The synthesis and analysis of our artificial cochlea yields insight into why the human cochlea uses an active traveling-wave mechanism to sense sounds, instead of using bandpass filters. The low power, wide dynamic range, and biological realism make our cochlea well suited as a front end for cochlear implants.     

基于ATM的网络互连方式

ＡＴＭ技术能否在数据通信网中广泛采用取决于其是否能高效地支持现有业务，其中主要为非连接业务。本文介绍了几种基于ＡＴＭ 的非连接业务支持方式和协议体系结构，对其进行了评述并对ＩＰ分组到ＡＴＭ信元的封装效率进行了分析。     

ATM局域网仿真体系结构的研究

本文在简要叙述了基于ＡＴＭ技术进行局域网仿真的原理后，对局域网仿真体系结构作了一些探讨。考虑的重点是无连接服务和群播功能的实现     

Automating manual reward systems

The introduction of Personal Computers has enabled Industrial Engineers to automate many aspects of their responsibilities, thus becoming significantly more productive. One aspect which clearly benefits from automation is the creation, implementation, and periodic maintenance of Pay-for-Performance Reward Systems. However, selecting the correct software package is not easy. Industrial Engineers currently have a variety of fully automated software packages to choose from which can range from $2,000 – $100,000. The initial cost alone may make it difficult to Justify for a small plant. Furthermore, if you have a variety of reward systems (Gainsharing - Small Group - One for One) finding a single program to handle all of them may be impossible.

This was a problem Norton Company faced five years ago. We are a fortune 500 company with manufacturing plants located throughout the world, using a variety of reward systems. To remain cost competitive in all aspects of our business, we had to find a way to reduce the on-going maintenance costs of our incentive systems.

Investigating alternatives uncovered a low cost, flexible solution to our problem. The use of off-the-shelf spreadsheet and data base software enabled us to fully automate all aspects of our reward systems.     

用功放驱动热电致冷器来调节温度

系统设计师设计光纤通信系统时经常会遇到一个问题，那就是如何确保激光系统可在某一温度范围内保持其特性。若温度改变，激光系统的中心频率也会随着改变。为了确保频率保持稳定，新一代的固态激光模块都内置一个热电致冷器(Thermoelectric Cooler, TEC)，以便将热能泵入模块或将热能释出，以调节温度。热电致冷器按照佩尔蒂埃效应(Peltier effect) 的原理运作。每当直流电流经热电致冷器时，热能便会由热电致冷器的一边传送至另一边，令热电致冷器的一边转“热”，另一边则转“冷”。若直流电被逆转，原先热的一边会转冷，冷的一边则会…     

高炉炉渣流动性的实验研究

以宝钢高炉渣中的四大组元(CaO,SiO2,Al2O3,MgO)为基础,实验研究MgO,Al2O3含量及碱度对炉渣的熔化性温度和流动性的影响.结果表明,炉渣中Al2O3含量控制在16%,配制适量的MgO(9%～10%),在1 500℃以上的高温区域,炉渣仍能保持正常的流动性,适合炉缸温度充沛的高炉使用;MgO含量由6%增加到10%时,较明显地降低了炉渣粘度,粘度的递减值约为0.07～0.15 Pa.s.