高速数字信号处理系统的硬,软件接口技术

本文介绍当前数字信号处理（ＤＳＰ）系统较为流行的结构，即以ＩＢＭ－ＰＣ及其兼容机作主ＣＰＵ，以ＴＭＳ３２０Ｃ３０作为从ＣＰＵ构成的宿主式系统，这里Ｃ３０是运算部件，而系统机是控制，管理和开发工具，两者的结合即高效又经济，并具有一定的通用性。     

Predictions of Benefits and Costs Derived from Improving Indoor Air Quality in Telephone Switching Offices

Airborne pollutants can cause failures in switching and computing equipment. This paper focuses on a subset of such pollutants - airborne fine panicles (< 2.5 μm diameter). It begins by examining the extent to which different improvements in heating, ventilating and air conditioning (HVAC) systems reduce indoor concentrations of fine particles. For each modification, the consequent reduction in soiling rate is derived. The concomitant increase in operating costs is also calculated. These costs are then compared with the costs of failures in telephone switching offices, leading to estimates of failure rate reductions that would make improvements cost-effective. Finally, the reduction in failures required to offset the costs of the improvements are compared with documented differences in failure rates between unimproved and improved environments. This study suggests that, in many telephone switching offices, the added operating costs associated with more efficient building filters and continuous fan operation are more than offset by reductions in failure rates.     

对我国高校校园网建设的看法与建议

本文对目前校园网的几种流行的网络结构方案作了较详尽的分析比较，并对校园网建设中注意的若干问题提出了几点建议。     

A high-speed and continuous 3D measurement system

A new system for high-speed and continuous 3D measurement is presented. It is based on the slit-ray projection method. The key component is the image plane constructed by a position-sensitive device (PSD) array that is horizontally un segmented and linear, but vertically numbered. All PSD row elements are attached to their respective analog signal processors. The analog signals are multiplexed and digitized by multiplexers and A/D converters at appropriate sampling intervals and stored in memory. By virtue of this configuration of the image plane, basis data for 3D measurement are acquired during only one scan of the slit ray at high speed in the form of memory addresses and data. Moreover, if we use large capacity and/or dual port memories, we can continuously obtain 3D range data for as many scenes as needed. The trial system has been implemented with a newly designed 128-channel PSD array and has verified our method, enabling us to obtain successive 3D range data at video rates with an error within±0.3%.     

超细玻璃微珠的理化特性及复合化玻璃微珠的研究

本文较系统地研究了一种超细玻珠的的化学成份，矿物组成，谱学特性及表面电性等，并简介了无机－无机，无机－无机－有机复合玻璃微珠的研制．     

面向IC芯片结构高速数字传输线特性三维电磁场时域模拟器

本文介绍一种采用对称凝缩节点传输线阵方法研制成面向集成电路芯片结构的高速数字传输线特性三维电磁场时域模拟器。模拟器能模拟高脉冲在ＩＣ芯片上由任意矩阵结构组成的共同传输线中的时域全波传输过程。     

SG4,LT55陶瓷的组织结构与性能

用扫描和透射电镜研究了氧化铝—碳化钨、氧化铝—碳化钛两种陶瓷材料的成分、断口形貌和精细结构。结果表明,两种陶瓷材料分别是由Al_2O_3,(W,Ti)C和Al_2O_3,TiC等相组成,断口形貌均为两类骨架结构,它们各自连续相互穿插结合,各相致密,其颗粒大小在0.5～1.0μm。有些颗粒和晶粒内部有亚晶粒和亚结构,其尺度为0.1～0.2μm左右两种材料的维氏硬度值HV分别是2600和2400。根据压痕法测得的压痕裂纹长度和硬度值参数,计算K_(IC)值分别是5.83和5.86MPa m~(1/2)。     

振动时效快速监测理论的研究

本文对国内普遍应用的、目的在于控制振动时效过程的快速监测法进行了分析和研究。通过试件对比,从宏观、微观两方面验证了这一方法的正确性。     

硒对α粒子体外照射诱发大鼠肺成纤维细胞恶性转化的防护作用

本研究应用体外细胞转化系统初步观察了硒对~(238)Puα粒子体外照射诱发成年 Wistar 大鼠肺成纤维细胞(WAL-F_1)恶性转化的防护作用。~(238)Pu α电镀源,活度为9×10~9Bq,细胞厚度8μm,源与细胞之间的距离0.75cm,剂量率1.10Gy/min。实验分为4组:对照组;Se 处理组(Se 最终浓度0.05mmol/mL);照射组(剂量为0.5Gy);防护组(照射前30min 加 Se 预处理,Se 浓度及辐射剂量同上),Se 作用30min 后洗脱。照射后观察细胞形态、增殖能力、染色体核型、Con A 凝集反应、在半固体琼脂培养基中形成集落能力以及在免疫抑制的动物体内的致瘤试验等。结果表明,防护组与照射组比较,其转化程度减轻,或不发生变化,最终在动物体内不形成肿瘤。提示 Se 可明显阻断α粒子照射诱发细胞恶性转化的发生与发展,为 Se 抗辐射作用提供了实验根据。     

Effect of the second filler which melted during composite fabrication on the electrical properties of short fiber polymer-matrix composites

This paper presents a method for greatly enhancing the electrical conductivity and electromagnetic interference shielding effectiveness of short conducting fiber filled polymers. This method involves the addition of a small proportion of metal particles as a second filler to the fiber polymer-matrix composite. The key to the method is that the metal particles melt during the composite fabrication, so that the metal electrically connects the metal-coated carbon fibers to a certain degree, thereby resulting in a partially connected three-dimensional network. By adding 2 vol% tin-lead particles to 20 vol% short nickel-coated carbon fiber filled polyether sulfone, the electrical resistivity was decreased by a factor of 2000, while the shielding effectiveness at 1 GHz was increased from 19 to 45 dB. No such improvement was found for the same volume fraction of tinlead particles added to an uncoated carbon fiber composite. This difference is due to the superior wetting of solder with nickel compared to that of solder with carbon, as shown by contact angle measurements. This paper is an extended version of a paper presented at the 6th Int. SAMPE Electron. Mater, and Processes Conf., June 1992.