脉冲激光回波动态测试系统

针对实际情况下战场复杂的烟尘环境,搭建一套脉冲激光回波动态测试系统。该系统主要包括脉冲激光发射子系统、接收子系统、回波数据采集子系统、数据存储与回放子系统及上位机控制软件,通过仿真与试验验证各个子系统的有效性,完成系统的联调与检测。测试脉冲激光在典型烟尘环境下的回波特性,实现回波动态采集存储与回放。通过对脉冲激光回波信号进行数据分析,得到相应的结论,为激光引信抗烟雾与扬尘干扰提供一定的依据。     

水电工程施工总布置三维图形建模

水电工程施工总布置是一个复杂的系统,文中对水电工程施工总布置三维可视化建模技术进行了深入研究。首先将施工总布置系统分解为各个子系统,然后基于GIS平台,对各个子系统采用不同的建模技术分别建立模型,最后通过可视化技术将其模型在屏幕上显示输出。在大型水电工程中的实际应用,证明了此方法的实用性和高效性。     

网络环境下企业经营危机预警系统研究

基于当前企业或多或少都存在或潜在经营危机的现状,提出一种综合的预警系统评价方法.构建了网络环境下企业危机预警管理系统的总体框架;分析了系统的原理流程,详细设计了各个子系统;建立了子系统的功能模型;阐述了危机评价子系统的实现过程.以此判断企业的经营危机状态,达到预警的目的,帮助企业加强危机防范意识,提高应变危机和防范能力.     

某超高层写字楼安全防范系统简介

本文简介了某超高层写字楼安全防范系统的设计,概述了写字楼安全防范系统的各个子系统,以及各个子系统中的重点.     

无人值守机房动力与环境监控系统的应用

就动力与环境监控系统在无人值守机房中的重要作用及应用,阐述该系统的组网方式及各子系统的组成,以及纳入该系统的各个单元的具体功能介绍。     

基于复杂系统的CESCE研究

针对我国建筑企业存在的信用危机, 提出建立基于复杂系统的建筑企业信 用评价系统（CESCE）。介绍了复杂 系统特点;借鉴复杂系统分析问题的 方法,设计了CESCE的整体架构; 对CESCE的数据库子系统、评价分析子 系统、公告平台子系统进行了系统说明; 详细阐述了建筑企业信用评价指标体系、 分析模型及数据处理方式。     

电业局电能表库管理的智能系统

本文通过对电能计量表仓储管理现状的调查研究，针对运用现代物流管理理论，借助于先进的计算机技术，提出了电能计量表计资产仓储管理系统的整改方案。系统的优势在于通过引进条形码系统实现了对电能计量表计的全生命周期管理和定位管理；另外，在系统中建立了计算机辅助决策支持子系统来为管理者作出更科学的决策提供参考。     

基于区块链的二维码包装广告监管和防伪溯源系统

针对广告监管和假冒伪劣商品识别两个问题,设计一个基于区块链的二维码包装广告监管和防伪溯源系统。介绍了3个关键技术:二维码、区块链和Python Django Web框架;对系统体系框架的顶层用户、中间层系统服务和底层区块链网络的需求进行分析,再依据需求分析设计了3个子系统即二维码子系统、广告监管子系统和防伪溯源子系统,最后利用Django框架,使用Python技术与MySQL,采用B/S架构,开发Web应用系统。本应用系统能对商品生产、流通、推广、销售的全过程进行灵活、细粒度的控制访问,提升了商品与服务的品质。     

现代建模与优化技术研究--在三江平原井灌水稻节水灌溉系统中的应用

将SPAC模型理论变相宏观应用于三江平原井灌水稻节水灌溉系统中，将地下水、农用机井、晒水池、渠道、本田池、环境因子等纳入整体系统，在各个子系统中综合运用现代建模与优化技术，通过有关机理与理论研究，建立相关的数学模型。对地下水、晒水池、渠道及水稻水分生产函数、水稻需水量、有效降雨等6个子系统进行建模与分析，制定了非充分灌溉条件下优化灌溉制度。最后通过典型示范小区的优化设计，将节水技术组装，实现了增温5～15 ℃，节水171 %，增产700～1 000 kg/hm2的目标。     

现代建模与优化技术研究——在三江平原井灌水稻节水灌溉系统中的应用

将SPAC模型理论变相宏观应用于三江平原井灌水稻节水灌溉系统中，将地下水、农用机井、晒水池、渠道、本田池、环境因子等纳入整体系统，在各个子系统中综合运用现代建模与优化技术，通过有关机理与理论研究。建立相关的数学模型。对地下水、晒水池、渠道及水稻水分生产函数、水稻需水量、有效降雨等6个子系统进行建模与分析，制定了非充分灌溉条件下优化灌溉制度，最后通过典型示范小区的优化设计，将节水技术组装，实现了增温5－15℃，节水17.1%，增产700－1000kg/hm^2的目标。     

热交换器的分类及优缺点分析

热交换器是将不同温度介质之间的热量通过热传导的形式,由高温介质传递给低温介质,使介质达到生产所需温度的工艺设备,也可作为一种节能设备使用.通过对不同热交换器的结构分析,总结不同热交换器的优缺点、适用环境,为生产工艺设计人员及设备制造单位在选择可降低能耗、提高效率的设备上提供参考.     

聚苯胺及其复合物的制备和结构及形貌分析

通过化学氧化法分别制备盐酸,盐酸和十二烷基苯磺酸,碳纳米管(MWNTs-COOH)掺杂的聚苯胺,利用红外光谱,紫外光谱,扫描电子显微镜和透射电子显微镜对所制备聚苯胺的结构和形貌进行分析。分析不同掺杂物对聚苯胺的结构和形貌的影响;同时研究了超声波作用对聚苯胺形貌以及聚苯胺包裹MWNTs-COOH情况的影响。     

Thermodynamic similarity and prediction of the properties and characteristics of substances and processes

Principles of the theory of thermodynamic similarity are considered in application to all aggregate states of a substance, including phase transitions, and to the change in dissipative structures in open systems.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 53, No. 5, pp. 709–716, November, 1987.     

Modelling and computation of curing and damage of thermosets

The curing of thermosets is a complex process involving the transition from a fluid into a (visco-) elastic solid. This phase transition comes along with an increase in stiffness and a volume shrinkage of the polymer. The latter may lead to severe residual strains and stresses, which in turn can cause damage in the final, usually quasi-brittle material. In this contribution a constitutive model is developed which takes into account the curing of a thermosetting material together with the process-induced damage as resulting from curing shrinkage. The curing of the material is governed by a phenomenological hypoelastic constitutive equation which includes temporal evolutions for stiffness and volume shrinkage. Thermal and viscous effects are neglected in the present study. An isotropic gradient-enhanced damage model is adapted to describe the damage evolution. The curing-damage model is implemented into a finite element code and numerical examples for thermosetting materials demonstrate that the proposed model is capable to predict cure-induced damage in thermosets.     

碳化硼陶瓷增韧补强和致密化研究现状及其展望

碳化硼陶瓷具有极高的硬度,然而其低韧性、低抗弯强度、难以致密化限制了它的广泛应用.已有一些研究集中于碳化硼陶瓷增韧补强和致密化,对这一方面国内外研究进展进行了归纳与评述,阐明各种增韧补强和致密化方法的优缺点,提出碳化硼陶瓷增韧补强和致密化研究值得发展的一些方向.     

Measurement and analysis of elastic and anelastic properties of alumina and silicon carbide

Measurements of dynamic Young's modulus, E, and damping as a function of temperature, T, were made for alumina and silicon carbide. The Young's modulus data were compared with some from the literature, and analysed in terms of a theoretical framework relating the Debye temperature, θD, with the elastic constants. For both materials this analysis yielded a ratio T₀/θ_D which was near 0.4, where T₀ is an empirical fitting constant for the plot of (E(0)−E)/T versus 1/T (E(0) is the value of E at 0 K). The analysis of the damping data in terms of an Arrhenius type dependence led to effective activation energies near kT, where k is Boltzmann's constant. This revised version was published online in November 2006 with corrections to the Cover Date.     

Surface-charge density and potential of coal-liquid mixtures and control of their stability and fluidity

The preparation conditions of concentrated (>70%) aqueous suspensions of coal were optimized, as were the surface charge density and the surface potential of the coal-water suspensions. The theoretical study showed that (1–3) or (2–3) electrolytes such as Na₂SO₄ or Na₅P₃O₁₀, greatly increase the surface charge density and the surface potential of the coal particles in water. This study has led to the interesting result that thinners and stabilizing agents of concentrated clay suspensions, such as lignosulphonates, tripolyphosphates, polynaphtalene sulphonates, etc., must also be good thinners and stabilizing agents for ground coal-water suspensions. Two parameters were controlled: the stability and the fluidity of the suspensions. A penetrometry technique revealed the importance of the resistance coefficient,C _r that can be used as a criterion for the evaluation of coal-water mixture stability and fluidity. Concentrated coal suspensions (about 75% of solid by weight) were prepared in water by using different additives, for instance sodium tripolyphosphate (NaTPP) and surfactants like lignosulphonates (by coupling of the dispersion and stabilizing effects) with the optimum concentration ratio of these two products equal to 1.9. The stability of the suspensions was then greater than 2 months and the viscosity was 1900 cP.     

SARS传染病数学建模及预测预防控制机理研究

首先，利用疾病传播的一般规律及人口守恒统计法则建立了四类人的SARS传染病数学模型，然后运用数学方法对四类人的SARS传染病数学模型进行分析，得出了其生理意义和预防、控制机理。其次，利用人工神经网络理论建立了SARS的预测模型，以北京市的SARS数据为例进行了预测和分析，预测结果显示该模型简单易行，预测精度高。     

Mechanisms of Corosion and Oxidation of Metals and Alloys

Selected topics in field of the study of the mechanisms of corrosion and of oxidation of metals or alloys are presented. The first part reports a new model for the mechanism of the breakaway oxidation of ferritic stainless steels in water vapour. The second part is devoted to the physico‐chemical aspects of oxidation and presents experimental methods useful in the kinetic modelling applied to two alloys, the zircalloy‐4 and an AlMg5 % in the liquid state. In the third part the physical and numerical modelling of the stress corrosion cracking behaviour in face‐centered cubic (fcc) alloys is detailed, which enables the study of the influence of macroscopic parameters (such as the temperature or hydrogen activity) on the fracture process.     

PSD和PWELCH函数的分析改进及应用

针对MATLAB中两个内建功率谱密度计算函数psd()和pwelch()计算结果迥异的现象,在功率谱密度估计理论的基础上,根据经典的周期图理论和Welch平均周期图方法,通过详细分析源程序,解析计算方法,发现psd()计算的并不是工程单边功率谱密度,而是采样信号双边谱,故与pwelch()结果迥异,另外pwelch()不能对分段信号数据进行预处理。就上述不足提出了相应的改进措施,比较验证表明改进措施行之有效。