6.3GHz反馈型介质谐振器振荡器的设计与实现

文章设计了一种场效应管源极输出的并联反馈型C波段介质谐振器振荡器,较详细地讨论了该结构的设计和仿真方法,即利用HFSS电磁仿真软件与ADS电路仿真软件联合仿真的方法,对介质谐振器振荡器性能进行了优化设计和仿真,并采用单管GaAs FET实现了输出频率为6.3 GHz的介质谐振器振荡器,得到了较满意地测试结果,其输出功率大于5 dBm,相位噪声为-94 dBc/Hz@10 kHz、-120 dBc/Hz@100 kHz。     

新型军用模块化充电电源

为了弥补部队装备中充电设备技术落后、自动化水平低的缺点,介绍了利用高频开关管IGBT构成模块化充电电源的主电路、控制电路及保护电路的结构、原理。利用该项技术研制的移动式充电车与充电柜,极大地提高了部队的快速反应能力。     

关于科研设备物资采购制度改革的实施建议

采购制度改革是“十五”期间解放羊提出的一项重要课题。根据上级有关改革精神和要求,分析防化研究院科研设备物资采购管理现状。并提出改革总体思路和具体措施。     

基于混沌特征的高分辨雷达目标识别

根据高分辨导弹制导雷达的基本工作原则和舰船目标的散射特性,利用现有雷达回波的仿真技术,在合理的战术想定下,计算了三类典型舰船的雷达回波.在此基础上,研究了利用雷达回波功率谱的方法来识别目标类型的有效性,并基于混沌理论提出了一种比功率谱方法更加有效的新的识别方法,从而为进一步利用混沌理论来开发雷达目标识别技术奠定了初步的理论基础.     

从非权力影响力的要素构成谈新时期部队领导干部威信的树立

贯彻以人为本,加强管理的民主化是部队管理发展的新趋势。部队管理中越来越强调现代军队领导干部的非权力影响力,塑造领导干部在官兵中的威信和号召力。从信仰、品格、知识、能力、感情等要素构成分析部队领导者非权力影响力的形成途径,对树立领导干部的威信,提高领导干部的能力,创新部队管理模式,具有现实意义。     

DES加密实现的差分功耗分析仿真

根据CMOS器件工作时产生功耗泄漏的机理以及功耗模型,建立了DES加密过程的DPA仿真模型与仿真平台,利用这个仿真平台,在没有复杂测试设备与测试手段的情况下,分析了DES加密实现在面临DPA攻击时的脆弱性。     

Protection of armoured vehicles against chemical,biological and radiological contamination

The article presents problems related to mechanical protection of vehicles with different add-on armours against chemical,biological and radiological contamination.This applies to vehicles with additional passive,reactive and hybrid protection in the form of cassettes against piercing with anti-tank pro-jectiles,piercing with their kinetic energy of impact,and as a result of chemical energy of shaped charges as well as explosively formed projectiles.It has been shown how increased ballistic protection of these vehicles at the same time reduces their decontaminability in various places of the vehicle due to the increased additional surface of the vehicle with cassettes.Prevention of contamination of these cassettes has been presented as a way of reducing hard to reach surface for decontamination and a method of insulating construction elements(stands),fixing these cassettes to the vehicle,from the environment to prevent contact with contaminated liquids and dusts.The selection of appropriate materials is shown,which may affect the improvement of the decontamination efficiency of the vehicle with such cassettes.This applies to the use of materials with low absorption of chemical warfare agents,which prevent the accumulation of large amounts of these agents on contaminated surfaces and improve the effectiveness of decontamination.It also shows how to ensure better access of the disinfectant to as much of the vehicle surface as possible,covered with cassettes that have been contaminated.It shows how a vehicle,in particular with such cassettes,can provide protection against radar detection when Radar Absorbent Material is used on vehicle cassettes.     

Improving the damage potential of W-Zr reactive structure material under extreme loading condition

Projectiles made of reactive structure materials(RSM)can damage the target with not only kinetic but also chemical energy,but the enhanced damage potential of RSM may become compromised if extreme loading condition disintegrates the projectile before the target is reached.In this work,a ductile coating of Ni was introduced to a tungsten-zirconium(W-Zr)alloy,a typical brittle RSM,to preserve the damage potential of the projectile.Detonation driving tests were carried out with X-ray photography and gun-powder deflagration driving tests were carried out with high-speed photography for the coated and uncoated RSM samples,respectively.The craters on the witness target were analyzed by scanning electron microscopy and X-ray diffraction.The Ni coating was found to effectively preserve the damage potential of the W-Zr alloy under extreme loading conditions,whereas the uncoated sample fractured and ignited before impacting the target in both detonation and deflagration driving.The crack propa-gation between the reactively brittle core and the ductile coating was analyzed based on the crack arrest theory to mechanistically demonstrate how the coating improves the structural integrity and preserves the damage potential of the projectile.Specifically,the Ni coating envelops the W-Zr core until the coated sphere penetrates the target,and the coating is then eroded and worn to release the reactive core for the projectile to damage the target more intensively.     

用复卷积对自适应预失真器的分析

随着移动通信中线性调制方式的出现 ,功率放大器的线性化已成为一个重要的研究课题。通常采用预失真线性化技术来提高功率放大器的线性度、减小带外发射。用复频谱卷积方法对移动发射机中功率放大器进行线性化的自适应预失真器进行了研究 ,理论分析和仿真结果表明 ,可用一种不需要任何附加本机振荡器或相位参考的复卷积方法测量带外功率并利用该量对预失真器系数进行最佳调整 ,从而使带外功率达到最小。     

复合材料层合结构的非线性传热分析

基于一阶热层合理论,考虑材料非线性的影响,建立了复合材料层合结构非线性传热分析的热层合理论及其有限元方程.通过数值算例研究了材料非线性对反对称复合材料层合板瞬态温度场的影响.