Design Optimization of Charger Based on PSPICE Simulation

The design of a high-frequency switching mode charger (HFSMC) was optimized using a PSPICE simulation of the charging system including a valve regulated lead-acid (VRLA) battery pack and the HFSMC.A high-frequency battery charging circuit model was developed to describe the battery dynamics when charging with DC current having high-frequency ripples. An IGBT circuit model, a high-frequency pulsed transformer coupling model and a silicon fast recovery diode model were also developed. Simulations were compared to laboratory measurements to verify the battery and system models. Simulation of the working states of an Fe-based nanocrystalline magnetic core used in the transformer shows that the transformer design can be optimized by adjusting the core gap and by employing an RC network. Further simulations show that the components in the output unit of the charger main circuit can also be optimized. Simulations also show that the battery dynamics Including the inductance should be considered for design optimization of the HFSMC.     

Optimal Dispatching of Large—scale Water Supply System

This paper deals with the use of optimal control techniques in large-scale water distribution networks. According to the network characteristics and actual state of the water supply system in China, the implicit model, which may be solved by utilizing the hierarchical optimization method,is established. In special, based on the analyses of the water supply system containing variable-speed pumps, a software tool has been developed successfully. The application of this model to the city of Shenyang (China) is compared to experiential strategy. The results of this study show that the developed model is a very promising optimization method to control the large-scale water sup-ply systems.     

采用贫混凝土基层的水泥混凝土路面厚度优化

采用贫混凝土基层的水泥混凝土路面是解决重载交通的一种理想路面形式。贫混凝土基层与水泥混凝土面层的不同厚度组合会对路面荷载应力产生较大的影响,考虑实际路面的各种要求,提出了厚度优化的数学模型。利用三维有限元模型,根据在不同结构形式下的合理目标函数,分析了最佳的厚度组合比。     

再现轨迹的凸轮连杆组合机构优化设计

分析了再现轨迹凸轮连杆组合机构的运动原理,推导出了计算公式,并给出了该组合机构尺度综合的优化设计方法。     

关于对氧化铝生产调度系统的探讨

对生产调度的特点进行了说明，讨论了调度系统结构及运行情况，指出了智能化调度系统在氧化铝生产中的应用前景。     

应用Matlab实现大型超静定回转窑机械运行状态的多目标模糊优化

结合中国长城铝业公司氧化铝厂回转窑机械运行状态多目标模糊优化模型,介绍了在Matlab环境下实现多目标模糊优化的有关技术,编写了实现回转窑机械运行状态多目标模糊优化的Matlab程序.现场应用表明,应用该程序指导调窑,能显著改善回转窑的机械运行状态,提高窑的运转率.同时该程序对于利用Matlab编写多目标模糊优化程序,具有重要参考价值.图3,参6.     

基于长株潭经济一体化的社会经济信息系统研究

长株潭社会经济信息系统是在地理信息系统支持下以基础地理数据和专题数据为地理实体对象，集知识、分析、决策和服务为一体的信息系统。从应用角度为空间数据管理和信息共享提供了可行的解决方案。     

安徽羽叶报春RAPD分析实验条件优化的研究

采用CTAB法^[1]从珍稀濒危植物安徽羽叶报春(Primula merrilliana)的幼叶中提取DNA，进行随机扩增多态DNA(RAPD)实验，通过Mg^2 、dNTP、Taq酶、模板浓度的优化，确立了RAPD反应的最佳体系(25μ1)范围为：Mg^2 浓度为2．0—2．5mmol／L，模板浓度为每个反应50—150ng，dNTP浓度为200—250μmol／L，Taq酶为1.5—2.0U，按照优化的RAPD条件进行的重复实验，重现性良好。     

公安电子政务系统的实现

随着网络技术的发展，电子政务系统也在网上广为应用．针对某市公安局电子政务系统系统资源不能共享等问题，运用软件工程和数据库理论，研制了新公安电子政务系统．介绍了其特点、作用与功能．给出了系统的设计和实现方法及有关的软件程序．运行结果证明了系统的可靠性．     

具有局部搜索能力的自适应变异遗传算法

针对函数优化问题，提出一种自适应变异遗传算法来提高局部搜索的能力，弥补简单遗传算法易于早熟收敛的缺陷。最后以De Jong函数为仿真对象，将此算法与其它三种遗传算法进行比较，仿真结果表明此算法对于函数优化问题非常有效，大大加快了算法的收敛速度，并大幅度提高了搜寻到最优解的概率。