Modeling and Control of Active Suspensions for MDOF Vehicle

The conventional method for analyzing active suspension control for a vehicle is only to analyze a quarter or half car with a lower order degree-of-freedom (DOF) model, but such models do not actually model practical applications. Accurate models of a suspension control system require a multi-degree-of-freedom (MDOF) vehicle model with a detailed model of the controller. An MDOF model was developed including the influence of factors such as the engine, the seats, and the passengers to describe vehicle motion using a reduced order model of the controller designed by using the H∞ control method. The control system performance has been investigated by comparing the H∞controller with a linear quadratic (LQ) controller.     

Abnormal pattern detected in fragile-X patients by pulsed-field gel electrophoresis.

The fragile-X syndrome is the most frequent inherited form of mental retardation, with an incidence of 1 in 1,500 males. It is characterized by the presence of a fragile site at Xq27.3 induced in vitro by folate deprivation or by inhibitors of deoxynucleotide synthesis. Its mode of inheritance is unusual for an X-linked trait, with incomplete penetrance in both males and females. Some phenotypically normal males transmit the mutation to all their daughters who rarely express any symptoms, but penetrance is high in sons and daughters of these carrier women. Genetic and physical mapping of the Xq27-q28 region has confirmed that the disease locus is located at or very near the fragile site. Hypotheses proposed to account for the abnormalities in the inheritance of the disease include sequence rearrangements by meiotic recombination or a mutation that affects reactivation of an inactive X chromosome during differentiation of female germ cells. To detect such rearrangements, or methylation changes that may reflect a locally inactive X chromosome, we used pulsed-field gel analysis of DNA from fragile-X patients with probes close to the fragile-X locus. The probe Do33 (DXS465) detected abnormal patterns in fragile-X patients, but not in normal controls or in non-expressing male transmitters.     

EBJ-120TP型掘进机的技术特点

介绍了EBJ-120TP型掘进机的主要技术参数、结构及其技术特点。     

加速度观测器设计与仿真

介绍了利用状态反馈综合带加速度反馈的最优控制系统，利用系统所检测的位置量和速度量设计了加速度观测器，并对综合的最优控制系统进行仿真，包括系统幅频、相频特性及状态估计值与真实状态之间的误差，最后给出了有、无加速度观测器反馈时系统跟踪晃动误差曲线。带加速度观测器反馈系统使晃动误差减小84％，滤除噪声的效果也比较好。     

被动雷达导引头多脉冲辐射源的角度分辨与跟踪

讨论了被动雷达导引头主波束内存在多脉冲辐射源时对多辐射源进行角度分辨并跟踪某一辐射源的方法。首先利用聚类分析法实现多辐射源角度分辨 ,然后利用主波束角度压缩方法实现单一辐射源跟踪。计算机仿真结果表明 :在中等密度脉冲辐射源环境下 ,采用聚类分析和主波束角度压缩相结合的方法可较好地实现导引头主波束内多脉冲辐射源的角度分辨与单一辐射源跟踪     

关于Euler数的一些恒等式

将欧拉数的形如的累加和的递推关系式更具体。     

基于广义混沌同步的数字图像隐藏方案

基于广义混沌同步理论，提出了一种适于网络图像传输的隐藏数字图像的安全通讯方案．构造了一个六维广义混沌同步系统作为新方案的加密器，理论分析和计算机模拟说明本方案具有较高的保真度和较强的抗破译能力．     

基于GA和BP融合算法的装备费用估算方法

简要介绍了GA和BP算法以及装备费用估算分析的传统方法 ,分析了GA、BP算法以及费用估算三者间相互结合的必要性。把GA和BP算法相结合并应用到装备费用估算分析领域 ,建立了基于GA和BP融合算法的防空导弹研制费用评估模型 ,并对典型的防空导弹型号研制费用进行了估算。结果表明 ,该模型具有计算精度高、适用范围广、运算速度快的特点 ,为装备费用估算提供了有效依据     

微连接用无铅钎料及稀土在钎料中的应用现状

综述了微连接用无铅钎料的应用研究现状，指出SnAgCu系合金因良好的综合性能将成为最有潜力的锡铅钎料替代品。基于对稀土在钎料中应用研究成果的分析，认为添加微量稀土有望成为改善SnAgCu系无铅钎料蠕变性能的重要途径。充分利用我国丰富的稀土资源开发低Ag的SnAgCuRE系钎料，应当成为中国今后无铅钎料研究开发的重点。     

HKD-1型航空润滑油的粘温特性

利用SYP1003型运动粘度测量器测量了HKD-1型航空润滑油在不同温度时的运动粘度，提出了粘度与温度之间的新关系式，并与Walther粘温模型进行了比较。结果表明：HKD-1型航空润滑油的粘度随温度升高而减小，其在低温时粘温特性较差，适合于20℃以上时使用。新的粘温模型比Walther模型预测精度高，适用的温度范围宽，尤其低温时的计算精度远远高于Walther模型。