动态不确定多输入多输出系统的变结构鲁棒控制

本文仅利用输入输出数据给出了一种动态不确定多输入多输出系统的变结构控制器设计机制，控制系统的设计中引入了一个严格正实的模型．应用适当逻辑切换的状态变量滤波器实现变结构控制．证明了所提方案能保证全局输出有界稳定并能实现滑模控制和渐近跟踪参考模型的输出．该设计方案对结构不确定性具有一定的鲁棒性．仿真结果表明了所提方案的有效性．     

一种基于区域分割的多级环境建模方法

针对现有移动机器人路径规划中各种环境建模方法存在使用范围有限、复杂问题处理能力不足和运行效率低、缺乏灵活性等问题，结合二维半描述和知识利用原理，提出了一种可以比较圆满地解决诸如建筑物内不同楼层连接、室内室外环境交替出现等实用结构性空间问题的基于区域分割的多级环境建模方法。     

Four-noded mixed finite elements,using unsymmetric stresses,for linear analysis of membranes

A family of new 4-noded membrane elements with drilling degrees of freedom and unsymmetric assumed stresses is presented; it is derived from a mixed variational principle originally formulated for finite strain analysis and already used in the literature to develop a purely kinematic membrane model. The performance of these elements, investigated through some well established benchmark problems, is found to be fairly good and their accuracy is comparable with that given by models with a larger number of nodal parameters.     

离散事件动态系统的代数模型及其控制器的分析计算

本文在离散事件动态系统的Ｐｅｔｒｉ网图形描述的基础上建立了相应的代数模型，该模型可以用来计算无竞争无回路Ｐｅｔｒｉ网的“最大状态”；该“最大状态”的计算在本文给出的动态反馈控制器中得到了应用。     

宝钢3号高炉计算机系统的RAS性能设计

在宝钢３号高炉计算机系统的开发过程中十分注意系统ＲＡＳ性能设计。本文介绍了３号高炉计算机系统设计中，为提高系统的ＲＡＳ性能所采取的各种对策。     

Neural Network Feedback Control: Work at UTA’s Automation and Robotics Research Institute

This is an outline of research in neural networks for feedback control done since the mid 1990s at the Automation and Robotics Research Institute (ARRI) of The University of Texas at Arlington (UTA). It shows how the developments of Intelligent Control Systems based on neural networks have followed three main generations. This statement provides a short, broad-brush perspective on the development of intelligent neural feedback controllers.     

Entrance effect on heat transfer to laminar flow through passages

This paper presents an accurate methodology to determine heat transfer coefficients near the thermal entrance region of ducts. These include parallel plate channels, circular pipes and rectangular passages. The solution technique uses a classical Airy differential equation when the thermal penetration is small. The validation and verification of these solutions are the essential part of this presentation as they are compared with available solutions. The results show a high degree of accuracy when the thermal entrance distance is very small. Also, this paper discusses the range of validity of this solution since its accuracy reduces at a larger distance from the thermal entrance location.     

Incongruent melting of gallium nitride at 7.5 GPa

Melting of GaN was studied at 7.5 GPa and 2300–2400 °C, using a split-sphere multi-anvil apparatus (BARS). Diamond synthesis from graphite in CaCO₃–C system and platinum melting were used as reference points for HPHT cell calibration. The initial samples of GaN were placed into boron nitride or graphite ampoules. No quench glass or quench crystals of GaN have been established. The incongruent GaN melting in the part of the samples at 2300 °C and in all samples at 2400 °C was fixed. Metallic gallium and gallium nitride as well as metallic gallium, gallium nitride and gallium oxide were observed in boron nitride and graphite ampoules, respectively. Results of the experiment indicate that the congruent melting of gallium nitride would occur at pressures > 7.5 GPa.     

PM2000水电厂生产运行管理系统

介绍了基于Web技术开发的PM2000水电厂生产运行管理系统的软、硬件结 构，详细阐述了该系统所具备的主要功能及其对提高水电厂生产运行管理水平所发挥的作用。