高层民用建筑安全疏散及应急对策

文章从高层建筑的火灾特点出发,分析了高层民用建筑安全疏散的重要性和必要性,并结合高层民用建筑安全疏散通道因素存在的问题提出了若干对策,以求更好地满足现代高层建筑对消防安全的需要.     

The minimum squared euclidean distance of multi-h phase codes

The minimum squared Euclidean distance(MSED) of binary multi-h phase codes is presented. The signal segregation degree(SSD) has been put forward to determine MSED of multi-h phase codes. In order to maximize MSED, SSD should be as large as possible. The necessary and sufficient conditions of maximizing SSD are derived. Finally, SSD and the exact formulae for MSED of binary 2-h phase codes are also presented.     

自动化安全监测系统在太平湖水库消险加固工程中的应用

太平源水库位于嫩江一级支流黄蒿沟上，控制面积683km^2，设计标准为100年一遇，2000年一遇校核，工程等别为大Ⅱ型，设计总加容1．53m^3。1999年12月被鉴定为三类病险率，原有观测设施基本报废，不有满足水库消险加固后的正常运行需要。为确保大坝安全，采用新的监测设备和技术。安装一套大坝安全自动化监测系统，对大坝安全状况进行自动监测与分析汇总。     

基于参差距离的相位差变化值的解模糊方法研究

利用相位差及其变化率对辐射源进行定位是新近提出的一种快速单基无源定位方法。本文分析了利用相位干涉议得到的相位差变化值的相位模糊特点,提出了一种利用相位干涉仪的接收天线之间的参差距离对相位差变化值进行解模糊的方法,讨论了正确解模糊的条件和范围,并给出了仿真结果。     

DDS技术在数字激光相位测距仪中的应用

本文介绍了直接数字合成(DDS)技术在激光相位测距仪中的应用。使用该技术研制的数字激光相位测距仪具有操作简便、携带方便、性能可靠的特点，测相精度优于干分之一。     

离轴数字全息记录条件的研究

用振幅全息和菲涅耳衍射理论,分析离轴数字全息记录系统结构参数对数字全息再现的影响,并进行相应的实验验证。理论分析和实验研究结果都表明,如果记录物体和CCD的尺寸固定,记录物体和CCD之间的记录距离将直接影响数字全息再现像的分离状况和系统的分辨率,在保证再现像分离的前提下,缩短物体和CCD之间的距离将有利于数字全息再现像分辨率的提高。     

运用模式分类的雷达抗转发式距离欺骗干扰方法

针对雷达转发式欺骗干扰中的距离欺骗，提出了一种基于模式分类来识别目标与干扰的方法。该方法基于干扰和目标能量和起伏特性差异确定提取特征因子，再利用RBF神经网络方法进行分类。仿真结果表明，该方法具有较好的抗距离欺骗干扰性能。     

河南电力远程教育网系统安全方案开发应用

河南省电力公司远程教育平台,作为一个省内电力系统职工的再教育、技术培训、技能培训中心,访问量大,安全要求高,我们在软件设计时充分考虑到系统的安全性。     

Critical building separation distance in reducing pounding risk under earthquake excitation

A separation distance between adjacent buildings is provided to reduce the risk of pounding of adjacent buildings under seismic excitations. It should be recognized that the evaluation of the critical separation distance is a one-sided barrier crossing problem while the problem of structural design under seismic excitations is a two-sided crossing problem. A procedure for assessing the required separation distance with or without considering possible uncertainty in structural properties was presented based on the reliability methods and random vibration theory. The procedure was used to carry out parametric analyses. It is shown that use of the complete quadratic combination (CQC) rule with the modal responses employed for designing structures may over- or underestimate the critical separation distance, depending on the damping ratios and the closeness of the natural vibration periods of adjacent buildings. This is due to not only one-sided versus two-sided crossing problem but also the approximation in the CQC rule. Further, the effect of the uncertainty in structural properties on the estimated separation is investigated. The results indicate that this uncertainty tends to increase the required critical separation distance.