提高底部框架——抗震墙结构综合抗震能力的措施

文章分析了底部框架--抗震墙结构在地震震害中的破坏特征,论述了合理确定抗震墙间距、数量及分布和控制层间刚度比的必要性,提出了在底部框架--抗震墙结构设计应该注意的问题,并结合工程实例作了具体分析.     

基于生产链的企业环境绩效测度模型

提出企业绿色度的概念，分析企业绿色度指标设置的目的、原则与方法，并对企业生产链的各个环节设置指标体系，采用层次分析法进行赋权，建立企业绿色度的计量模型，考核企业的环境绩效。     

电厂远程专家分析平台的建立

提出了建立电厂远程专家分析平台的整体方案．合理构建了电厂远程实时运行数据库平台，基于此数据库平台，进行专业应用软件的开发．介绍了远程实时监视、远程经济性分析、远程仿真、远程故障诊断等专业软件的开发思路.     

PPLN准相位匹配内腔光学参量振荡器的实验研究

将准相位匹配光学参量振荡器(QPM-OPO)置于激光二极管(LD)端面泵浦的声光调Q1064nm-Nd:YVO4激光器谐振腔之内,获得了信号光单谐振的内腔光参量输出。在声光Q开关重复频率为25kHz的条件下,内腔参量振荡的阈值仅为0.9W(LD功率)。在6WLD泵浦功率下,获得了350mW的信号光输出。通过在120℃~250℃范围内改变PPLN晶体的温度,信号光输出实现了在(1493~1538)nm波段的调谐。     

基于MVC模型的SVG生产实时监控系统设计与实现

针对传统生产实时监控系统灵活性差的问题,应用SVG技术进行了改进,适用于异构系统环境;并结合MVC架构设计并实现了扩展性高、移植性好、灵活性强的J2EE实时监控系统。     

Long-term Energy Demand and CO_2 Problem in the PRC

The long-term energy demand in China and the-Chinese share in global CO2 emission are forecasted on the basis of scenarios of population growth and economy development up to 2050 proposed in view of the interaction of energy, economy, environment and social development. The total energy demand in 2050 will reach 4.4~ 5.4 billion tce. It is shown in energy supply analysis that coal is China's major energy in primary energy supply. The share of CO2 emission in the future Chinese energy system will be out of proportion to its energy consumption share because of the high persentage of coal to be consumed. It will reach about 27%. The nuclear option which would replace 30.7% of coal in the total primary energy supply will reduce the share by 9.8%. So the policy considerations on the future Chinese energy system is of great importance to the global CO2 issues.     

指标均衡性对评价结果的影响

本文针对一类需要考虑指标间均衡性的决策问题,利用Gini系数,提出了一种新的多目标决策方法。     

ANALYSIS AND COMPUTATIONAL ALGORITHM FOR QUEUES WITH STATE-DEPENDENT VACATIONS Ⅱ:M(n)/G/1/K

We study a single-server queueing system with state-dependent arrivals and general service-distribution.or simply M(n)/G/1/K.where the server follows an N policy and takes multiple vacationswhen the system is empty.We provide a recursive algorithm using the supplementary variable tech-nique to munerically compute the stationary queue length distribution of the system.The only inputrequirements are the Laplace-Stieltjes transforms of the service time distribution and the vacation timedistribution.and the state-dependent arrival rate.The computational complexity of the algorithm isO(K~3).     

在相对论性激光-等离子体系统中模拟激光参数对等离子弧柱形态的影响

基于相对论性激光-等离子体动力学理论和PIC方法建立了激光入射等离子弧柱的模型,该模型描述了激光入射等离子弧后粒子的运动,并模拟了弧柱形态的变化。通过改变激光的平均功率、脉冲宽度以及重复频率,模拟等离子弧柱形态变化,得到的激光参数对等离子弧柱形态的影响规律。通过控制弧柱的直径可以提高材料的熔积性能。计算结果表明增大激光平均功率、脉冲宽度,可以更深地压缩等离子弧;但是,重复频率的影响则会出现波动现象。激光等离子复合加工更适合于精细加工。     

A New Signal Processing Technique of π/4-DQPSK Modem Based on Software Radio

1 .INTRODUCTIONπ/4 DQPSKmodemhasbeenchosenasthemodemschemeinmanymobilecommunicationsystems[1 ] .Inπ/4 DQPSKmodem ,theinformationbitsaremappedintophasetransitionsratherthanabsolutephasevalues.Thisencodingofinformationinthetransitionsovercomesthephaseambiguityproblemsresultingfromtheestimationofcarrierphaseinnon differentialPSKsystems.Soπ/4 DQPSKallowsforsimplebasebanddifferentialdemodulation .Further,inπ/4 DQPSK ,themaximumphaseshiftisrestrict edto± 1 35°(ascomparedto± 1 80…