核事故条件下的大气扩散模式及应用

本文介绍一个适用于核事故条件的大气扩散模式(粒子-烟团模式)的建立与调试。模式在模拟大气扩散的粒子随机游走方法中引入类似于扩散烟团的核函数概念，用以反映单个随机游走粒子所代表的污染物质的空间影响范围。模式解决了随机游走粒子与核函数“烟团”耦合后反映扩散物理真实过程的一致性问题，在约200km的范围内模拟结果与理论结果相一致。与代表实际大气典型扩散状况的高斯烟羽模式的结果进行定量比较，表明本模式结果在10km的范围内总体合理，但在近源处有系统偏小。模式瞬时浓度的涨落相对于平均轴线浓度大体控制在20％～30％的范围内。将模式应用于秦山地区的实际地形和气象条件进行实例测试表明，其结果可以反映当地复杂的大气扩散过程和特性。     

γ辐照对聚己内酯性能的影响

研究了不同分子量的聚己内酯的辐照特性，聚已内酯(PCL)的分子量越大，辐射交联所需的凝胶化剂量越低。结果表明，溶胶分数s √s与I／D的关系很好地符合Charlesby-Pinner关系式，说明PCL的辐射交联属于无规交联。辐射交联对PCL的力学性能影响显著，辐射剂量越大，拉伸强度和断裂伸长率下降越多，但分子量较高的PCL的抗张强度受辐射剂量的影响较小。动态力学分析(DMA)分析表明，聚己内酯辐照交联后的弹性模量和耐热性能显著提高。     

核燃料循环中所用含磷萃取剂的辐照稳定性研究

对核燃料后处理以及高放废液处理中所用的含磷萃取剂的辐照稳定性已经进行了广泛的研究。对正辛基苯基-N，N’-二异丁基胺甲酰甲基氧化膦(CMPO)、二(2-乙基己基)磷酸(DEHPA)以及混合三烷基氧化膦(TRPO)等的辐照稳定性的研究进行了综述。主要介绍了CMPO、DEHPA和TRPO的辐解产物；辐照对萃取和保留的影响以及辐照后溶剂的净化方法。     

Modification of Boundary Parameters and Fluctuations by IBW and LHCD in the HT-7 Tokamak

Measurements of boundary parameters and their fluctuations have been performed in ohmic (OH) plasma and Ion Bernstein Wave (IBW) and Lower Hybrid Current Drive (LHCD) enhanced confinement plasma using a pneumatically driven Langmuir probe array on HT-7 toka-maX. In the enhanced confinement plasma~ the gradients of electron density and temperature become higher and a transport barrier comes into being in the vicinity of the limiter. The boundary potential shows a clear modification in the same region. The fluctuation levels are significantly depressed and the coherences between fluctuations are reduced evidently in the enhanced plasma.Meanwhile, we obtained the spectral features and the poloidal phase velocity of fluctuations us-ing a two-point correlation technique and found obvious modifications of the turbulence and the poloidal flow. The results suggest that the improved confinement in the IBW and LHCD enhanced plasma is at least partially due to the modification of the boundary parameters and the suppression of the boundary fluctuations and fluctuation induced fluxes.     

PDE造型方法在复杂曲面设计中的应用

研究了偏微分方程曲面造型方法在飞机外形设计中的应用.该飞机模型的机翼具有边条,因而给曲面造型带来一定的困难.本文应用周期PDE曲面片,构造出了机身与机翼之间G1光滑拼接的过渡面.同时,用PDE方法构造出机身与前小翼及尾翼间的过渡面.实践表明,PDE方法在光滑拼接过渡面的设计中简便实用.     

无功和电压质量

针对电网的特点,浅谈电力系统电压和无功功率的重要作用及几种控制技术的应用。     

基于一类SM SA 策略的模型最优降阶

将一类SMSA混合策略应用于模型的最优降阶，提出了处理约束优化和解决模型降阶通常遇到的稳定性问题的有效方法．通过对典型例子的数值仿真表明了混合策略和约束处理方法的有效性，而且第3个例子的优化结果明显优于以往文献的结果。     

基于VB6.0的PC-单片机多波特率通信检测方法

在PC-单片机分布式多波特率通信系统中．利用微软的MSComm控件、VB6．0编程语言和单片机的定时／记数器可以智能、准确、简单地实现单片机波特率随主机变化而自动检测调整。     

An effective hybrid genetic algorithm for flow shop scheduling with limited buffers

As a typical manufacturing and scheduling problem with strong industrial background, flow shop scheduling with limited buffers has gained wide attention both in academic and engineering fields. With the objective to minimize the total completion time (or makespan), such an issue is very hard to solve effectively due to the NP-hardness and the constraint on the intermediate buffer. In this paper, an effective hybrid genetic algorithm (HGA) is proposed for permutation flow shop scheduling with limited buffers. In the HGA, not only multiple genetic operators based on evolutionary mechanism are used simultaneously in hybrid sense, but also a neighborhood structure based on graph model is employed to enhance the local search, so that the exploration and exploitation abilities can be well balanced. Moreover, a decision probability is used to control the utilization of genetic mutation operation and local search based on problem-specific information so as to prevent the premature convergence and concentrate computing effort on promising neighbor solutions. Simulation results and comparisons based on benchmarks demonstrate the effectiveness of the HGA. Meanwhile, the effects of buffer size and decision probability on optimization performances are discussed.     

关于水电开发特许权经营的探讨

在介绍资源开发特许权经营的国际经验的基础上，分析了我国实施水电资源开发特许权经营和必要性和可行性，认为实施水电资源开发特许权经营是市场经济发展的必然要求，是加快发展水电的需要，是水电发展的制度创新，它体现了公开、公正、公平的原则，有利于提高资源配置的效率。