四倍频Nd：YAG激光在高压氢气中的喇曼频移研究

利用Nd:YAG固体激光器四倍频输出(266nm)在高压H₂中的受激喇曼散射获得多波长的激光输出。当泵浦能量一定时,通过改变H₂压力得到了最佳的能量输出,299nm波长的激光能量为3mJ,341nm波长的激光能量输出为6.1mJ,398nm波长的激光能量输出为2.8mJ,239nm波长的激光能量输出为0.8mJ,同时在477nm,595nm,218nm,200nm波段也有能量输出。     

三平板剪切干涉仪自动测试系统

三平板剪切干涉仪是环路剪切干涉仪中最简单的一种,它具有基本等光程、剪切量连续可调、两出射光束恒相互平行等特点。利用三平板剪切干涉仪对激光器出射波面质量进行检测,探讨了由剪切干涉图复原原始波面的1阶微分法,编制了专家辅助软件系统,为光机型的三平板剪切干涉仪配置了实时图像采集、处理系统,实现了光、机、电、算相结合,融硬、软件于一体的数字波面剪切干涉仪,并通过实验验证了方法的重复性精度。     

准连续波体制雷达最大熵方法的算法选择

准连续体制作为一种新型雷达体制以其固有的优越性给雷达界带来了巨大的冲击。其数字信号处理系统的开发是进一步完善该体制雷达的关键。本文针对数字信号处理系统中最大熵谱外推电路的算法选择进行了研究。     

Mixture of probability distributions as a basic component in simulating measurement accuracy

A stochastic model is proposed for a basic mechanism in the formation of uncertainties in physical quantity measurements. __________ Translated from Izmeritel'naya Tekhnika, No. 1, pp. 12–17, January, 2006.     

Multi-User MIMO Mobile CDMA Uplink System Employing Turbo Coding and Joint Detection Through a Multipath Rayleigh Fading Channel

In this paper, a generalized multiple-input multiple-output (MIMO) antenna system that can be fitted to the uplink of a wireless communication system is considered for the general case of multi-user. At the transmitter, the information bits are Turbo coded, then interleaved and passed through a serial-to-parallel converter. The channel is assumed bad urban suffering from multipath Rayleigh fading resulting in inter-symbol and multiple access interferences (ISI and MAI). At the front-end of the receiver, a number of receiving antennas are used followed by a joint multi-user estimator based on the Minimum Mean Square Error Block Linear Equalizer (MMSE-BLE).Computer simulations demonstrate a significant performance improvement in both single user and multi-user cases.This paper depends in parts on that presented at the 11th European Wireless Conference, Cyprus, Nicosia, pp. 187–192, April 2005. Yasmine A. Fahmy was born in Guiza, Egypt, on June 4, 1976. She received the B.Sc., M.Sc. and Ph.D. degrees in Communication and Electronics engineering from Cairo University, Egypt on 1999, 2001 and 2005 respectively. She is presently an assistant professor at Cairo University, Egypt. Her current field of interest is wireless communication and channel estimation. Hebat-Allah M. Mourad received her B.Sc., M. Sc. and Ph.D. degrees in electrical communication engineering from Cairo University, Egypt, in 1983, 1987 and 1994 respectively. Since 1983, she has been with the Department of Electronics and Communications, Faculty of Engineering, Cairo University, and is currently associate professor there. Her research interests include optical fiber communications, mobile and satellite communications. Emad K. Al-Hussaini received his B.Sc degree in Electrical Communication Engineering from Ain-Shams University, Cairo, Egypt, in 1964 and his M.Sc and Ph.D. degrees from Cairo University, Giza, Egypt, in 1974 and 1977, respectively. From 1964 to 1970, he was with the General Egyptian Aeroorganization. Since 1970, he has been with the Department of Electronics and Communications, Faculty of Engineering, Cairo University, and is currently professor there. He was a research fellow at Imperial College, London, UK, and at the Moore School of Electrical Engineering, University of Pennsylvania, Philadelphia, PA, USA, in the academic years 1976/1977 and 1981/1982, respectively. In 1990, he received the Egyptian national encouragement award for outstanding engineering research. He has written several papers for technical international journals and conferences. His research interests include signal processing, fading channel communication, modulation, and cellular mobile radio systems. Dr Al-Hussaini is a senior member of IEEE. He is listed in Marquis Whos Who in the World and in the IBC (International Biographical Center, Cambridge) for outstanding people of the 20th century.     

平面药包抛掷爆破的漏斗特征解析

根据惠州港通用码头陆域平面药包抛掷爆破的实爆堆积测量分析成果 ,结合药包设计的主要参数 ,对平面药包产生的爆破漏斗的范围与形态、不同药包部位的残方比与抛掷率、药包的长抗比与圆柱体药包的应力波形演变关系予以解析 ,供硐室爆破的理论研究、模拟试验和总结条形药包特性时参考     

用有限带宽反射波波形分析法进行储层横向预测

以正演地震模拟为基础的有限带宽反射波渡形分析法是一种新的储层横向预测方法。首先利用波形分解确定地震反射层的地质属性,找出能反映岩性变化的反射波波形特征参数;然后,采用多元数据聚类分析和灰色系统理论完成储层横向的预测。文中以预测江苏 J 凹陷 F 构造上阜二段生物灰岩分布及厚度横向变化为例,简述了反射波波形分析的全过程。预测结果已为钻探证实。     

应变式压力传感器特性补偿和应用

讨论了用动态补偿数字滤器对应变压力传感器的动态特性进行补偿，使之提高测量精度并能用于爆炸冲击波测量的一种方法。实验结果与经验值比较，补偿前．后对比、测量精度有明显提高，说明在一定条件在变式测压系统也可用于爆压的测试。     

直接探测测风激光雷达的性能分析

综述了激光雷达大气风场测量的方法，提出了采用直接探测到量三维风场分布的F-P干涉仪方法，简述了测量原理，分析了系统的性能和测量误差，比较了基于分子散射和气溶胶散射的系统测量精度，给出了基于瑞利散射的激光雷达系统方案。     

含有复合阻尼结构的压力波制冷机振荡管内流动分析

通过对含有复合阻尼结构的压力波制冷机振荡管内的流场分析，详细讨论了激波在接受管内的行为，数值计算同时表明：含有两道复合阻尼结构加上激波吸收腔完全可以将激波降低到工程上可以接受的程度。