双模型三元混晶的界面极化子

采用ＥＰＭＡ近似法,研究了双模型三元混晶界面极化子的性质,计算了ＺｎＳｘＳｅ１－ｘ（ＧａＡｓ）和ＡｌＧａ１－ｘＡｓ（ＧａＳｂ）材料中界面光声子与电子的耦合随ｘ的变化。结果表明,在强电场作用下,界面光声子与电子的耦合加强;体光声子与电子的耦合在ｘ的某一值处存在极小值,界面光声子与电子的耦合随ｘ的变化则较复杂。     

管内自由衰减旋流阻力与换热的衰减特性

针对管内自由衰旋流局部流动,阻力及换热特性理论研究的不足,根据流体力学动量矩定量,从理论上推导了管内自由衰减旋流当地最大切向速度、当地阻力系数以及当地换热努塞尔数沿管长衰减的解析式,理论解与试验结果吻合良好。     

LOCAL MAXIMUM PRINCIPLE FOR SINGULAR DISCRETE-TIME LINEAR SYSTEMS

In this paper a local maximum principle for the singular discrete-time linear systemMx(k)=φx(k-1)+Bu(k-1)is investigated.By using this local maximum principle we can discussthe linear-quadratic optimal regulator problem and the minimum energy problem for singulardiscrete-time linear systems.     

Systems and organizations: Distal and proximal thinking

The paper introduces the contributions to this special issue ofSystems Practice on Systems and Organizations: New Directions in terms ofdistal andproximal thinking. Distal thinking refers to ready-made concepts, to the finished effects and outcomes of thought and action; proximal thinking, to process and event, to the continuous and unfinished. The papers presented here deal with various aspects of the distal/proximal distinction in social systems and organizations, and especially draw out the implications of recent work in information technology, sociology of technology, accounting theory, and organization studies for a proximal conception of systems and organizations.     

一种地地导弹发射控制的LAN网仿真

给出了某型号导弹发射控制各装备的仿真模型,利用微机局域网（LAN）建立了导弹发射控制的分布式超实时仿真系统,在室内再现了导弹发射控制的全过程,为研究和评估导弹发射控制的性能提供了一种技术手段,从而也为改进和提高导弹控制的有效性提供了条件。     

Memetic algorithm for multi-mode resource-constrained project scheduling problems

A memetic algorithm （MA） for a multi-mode resourceconstrained project scheduling problem （MRCPSP） is proposed. We use a new fitness function and two very effective local search procedures in the proposed MA. The fitness function makes use of a mechanism called ＂strategic oscillation＂ to make the search process have a higher probability to visit solutions around a ＂feasible boundary＂. One of the local search procedures aims at improving the lower bound of project makespan to be less than a known upper bound, and another aims at improving a solution of an MRCPSP instance accepting infeasible solutions based on the new fitness function in the search process. A detailed computational experiment is set up using instances from the problem instance library PSPLIB. Computational results show that the proposed MA is very competitive with the state-of-the-art algorithms. The MA obtains improved solutions for one instance of set J30.     

无功就地补偿技术在煤矿井下的应用前景

对无功就地补偿技术在煤矿供电系统的应用中进行了分析,指出该技术能够起到节约电能、提高供电质量、节约材料费等作用,阐述了无功就地补偿技术在煤矿供电系统中的应用有较好的发展前景。     

金融POS机在公用分组交换网上的应用

金融ＰＯＳ机在公用分组交换网上的应用,对使用信用卡的客户购物更方便。工程中对传统电话网组网方式和公用分组交换网方式进行了分析比较,结果采用了后者来实现对信息的处理,从而提高了金融机构信用卡的服务质量,这将对金卡工程起到积极的促进作用。     

动态单机调度的一种滚动时域策略及全局性能分析

针对全局信息不完全的一种单机的动态调度模型,设计了局部调度子问题带终端惩罚函数的滚动调度策略,并对这种滚动调度策略下的全局性能进行了分析.通过对未知工件按FIFO规则进行虚拟调度,对滚动调度进程中的全局性能进行评估,证明了在所给滚动调度策略下,随着工件信息的逐步获取,全局调度中的虚拟调度逐步变为已知调度,并经过滚动局部调度而部分实现,决策时刻向前推进,对全局性能指标的估计越来越接近将实现的实际值,逐步实现的全局调度性能相对历次的估计值不断改善.终端罚函数滚动调度策略可以保证滚动调度进程中全局性能的稳定性,当工件到达较快时,文中的滚动调度策略更有优势.