用改进的元胞自动化模型模拟不同信号灯控制策略下的交通流

Traffic flows controlled by traffic light strategies were investigated via a cellular automaton model with anticipation, which is suitable for describing urban traffic. Three kinds of strategies, i. e., synchronized, green-wave and random switching lights, were designed, simulated and compared with each other. It is shown that the green-wave strategy is only valid at lower density and there is not an effective way with the three strategies to improve the efficiency of traffic flow at high density.     

一种改进的无线传感器网络DV-HOP定位算法

为了解决DV-HOP算法在节点随机部署环境下定位误差较大的缺点,提出一种基于DV-HOP多通信半径的加权双曲线定位算法RWHDV-HOP。该算法通过理想跳数与实际跳数的差值修正平均跳距,结合多通信半径使跳数小数化,利用基于跳数加权的双曲线算法估算未知节点坐标。仿真结果表明,在相同条件设置下,RWHDV-HOP算法定位精度比传统DV-HOP算法提高了25%,比RWDV-HOP算法提高了10%。因此,基于DV-HOP多通信半径的加权双曲线定位算法RWHDV-HOP在节点随机部署环境下能够较大程度上提高节点定位精度。     

电磁力驱动液体流动及流动显示方法

阐述以电磁流体和电磁流体力学理论为基础,应用硫酸铜溶液作为产生电磁流体流动现象的一种液体,用金属铜板作为产生匀强电场的极板,用密绕的长直螺线管产生匀强磁场的方法,设计出液体在电磁力作用下的流动实验方法及流动的显示方法.     

陕西省商品粮基地县建设的思考

对陕西省商品粮基地县建设的分析表明，该省商品粮基地县数量自1984年的20个增至2000年的38个，其粮食作物播种面积与粮食产量则呈波动性上升。商品粮基地县在地域分布上主要集中于关中平原，其次是汉中盆地，黄土高原及陕南秦巴山地呈零星分布。随着“人粮矛盾”的日益突出，务必加大对关中平原和汉中盆地商品粮基地县的建设力度，并在自然生态条件有所改善的延安、安康等市开拓新的商品粮基地县。     

一维磁流体力学方程组的整体经典解

针对一维磁流体方程组的Cauchy问题，研究其经典解的存在性，通过构造两个变限函数，对磁流体方程组变表形，利用偏微分方程理论，证明并给出了其经典解存在的一个充分必要条件。     

On-line estimation of concentration parameters in fermentation processes

INTRODUCTION Saccharomycete, closely linked with human life, is the only microbe that has been utilized to the extent of over a million tons in the world, and is one of the modelled biological bacteria mostly used in modern genetic engineering. Since there are no effective online instruments for measuring the production or resultant concentration, which is a very important quality index in fermentation process, soft sensors (Martin, 1997; Tham et al., 1991; Assis and Filho, 2000; Salgad…     

浅谈计算机网络在学籍管理中的应用

讨论网络化过程中应该重点关注的几个问题:网络环境中学籍管理模式的改变,部门之间的数据共享,学籍数据的安全性问题,由单纯的成绩处理转型为业务型+辅助决策型。     

Modeling of D-STATCOM in distribution systems load flow

This paper presents modeling of Distribution STATCOM (D-STATCOM) in load flow calculations for the steady- state voltage compensation. An accurate model for D-STATCOM is derived to use in load flow calculations. The rating of this device as well as the direction of required reactive power injection for voltage compensation in the desired value (1 p.u.) is de- rived and discussed analytically and mathematically by the phasor diagram method. Furthermore, an efficient method for node and line identification used in load flow calculations is presented. The validity of the proposed model is examined by using two standard distribution systems consisting of 33 and 69 nodes, respectively. The best location of D-STATCOM for under voltage problem mitigation approach in the distribution networks is determined. The results validate the proposed model for D- STATCOM in large distribution systems.     

新加坡的教育分流制度及对我国教育改革的启示

本分析了新加坡教育分流制度的理论依据，对其教育分流制度进行了详细的阐述，并从精英与大众，划一与求多，职教与普教三个方面研究 新加坡的教育分流制度对我国教育改革的启示。     

浅谈普通高校涉密人才流动中的保密管理

随着我国市场竞争机制的逐步建立和完善,普通高校涉密人才竞争和流动不可避免地频繁和活跃起来。涉密人才流动在推动经济社会进步方面发挥着其不可替代的作用。但也存在不少问题,导致失泄密和窃密事件的发生。尽快解决这些问题,促使普通高校人才流动走向合理、合法,将能进一步发挥人才流动的积极作用。