印制板液态感光阻焊油墨的工艺控制

本文介绍印制板液态感光阻焊油墨的工艺流程、工艺控制，并对生产中较常出现的几种质量问题进行讨论，进而提出解决措施。     

基于可寻址分支分配器的CATV收费系统

给出了一种基于可寻址分支分配器的ＣＡＴＶ收费管理系统设计方案，并着重介绍了系统的工作原理及可寻址分支分配器的设计。     

X波段及DBS接收用PHEMT单片低噪声放大器

报道了X波段及DBS接收用单片低噪声放大器的研制结果。利用CAD软件对单片电路进行优化设计，设计工作包括MBE材料、PHEMT器件和单片电路三部分。在研制过程中，开展了关键工艺的专题研究。研究结果为：单级单片放大器在10：5－11．6GHz范围内，NF≤1．82dB，G≥7.72dB；在11．7－12．2GHz范围内，NF≤1．80dB，G≥6．8dB；双级放大器在10．4－11．1GHz范围内，NF≤1．96dB，G≥15．3dB，最低噪声系数为1．63dB，最高增益为16．07dB。     

Solaris2.X操作系统上NFS的环境配置

本文描述了Ｓｏｌａｒｉｓ２．Ｘ操作系统上网络文件系统ＮＦＳ的特性及其环境配置，介绍了如何建立了ＮＦＳ服务器和ＮＦＳ客户机，从而实现了远程文件系统资源共享。     

语音识别算法的确定与实现

在语音识别的实验中，对几种算法方案进行了比较、分析和择优淘劣，标准是在一定词汇量的条件下，权衡占用机器的内存空间、（正确）识别率和响应速度。力争使与话者有关的单词语音识别系统的设计达到优化，取得满意的结果。本文即是此项实验的总结。     

Growth and characterization of hot-wall epitaxial CdTe on (111) HgCdTe and CdZnTe substrates

Thin CdTe films were deposited by hot-wall epitaxy (HWE) on (111) HgCdTe and CdZnTe substrates at temperatures from about 140 to 335°C. X-ray rocking curves were used to show that crystal quality of the CdTe (111)B films improved as substrate temperature increased from 140 to about 250°C. Rocking curve values for full width at half maximum (FWHM) decreased from 2–4 degrees at 140–150°C to less than 100 arc-s at 250°C, and a FWHM of 59 arc-s was the lowest value observed near 250°C. The FWHM of the HWE CdTe was found to be insensitive to growth rate below about 400Å/min, but increased to four degrees at 1250Å/min. X-ray diffraction confirmed that films grown on the B-face at higher temperatures were epitaxial, but contained a significant volume fraction, 35% to 50%, of rotational in-plane twins. Electron microscopy confirmed a coarse twin density, and photoluminescence spectra showed an absence of excitonic emission in the HWE films. Simultaneous growth on two (111) HgCdTe substrates with different surface polarities between 230°C and 335°C showed that deposition rate on the A-face decreased relative to that on the B-face as temperature increased. Films grown on the B-face exhibited better surface morphologies than those grown on the A-face.     

Long-wavelength 640×486 GaAs-AlGaAs quantum well infraredphotodetector snap-shot camera

A 9-μm cutoff 640×486 snap-shot quantum well infrared photodetector (QWIP) camera has been demonstrated. The performance of this QWIP camera is reported including indoor and outdoor imaging. The noise equivalent differential temperature (NEΔT) of 36 mK has been achieved at 300 K background with f/2 optics. This is in good agreement with expected focal plane array sensitivity due to the practical limitations on charge handling capacity of the multiplexer, read noise, bias voltage, and operating temperature     

β—BBO晶体的电光性能

用干涉法测量了β－ＢＢＯ晶体的电光系数：γ２２＝２．６，γ３３＝０．２３，γ３１＝０．２５，γ５１＝－３．５×１０－１２ｍ／Ｖ。结果表明如果在Ｙ方向加电场，Ｚ方向通光，β—ＢＢＯ晶体可能制作成有应用价值的光开关。     

钛酸铅系薄膜的热释电性能及其应用

叙述了钛酸铅系薄膜的热释电原理，介绍了国际上近几年钛酸铅系薄膜材料、制备工艺及热释电性能，并与块状陶瓷材料进行了比较，分析表明钛酸铅系薄膜具有优良的热释电性能及可观的应用前景。