压杆与结构的稳定分析

结构的承载能力包括强度、刚度、稳定性,本文对含有压杆的结构(含静不定结构)进行了稳定性的分析,对结构的临界载荷与结构失稳的最小载荷进行了研究,对压杆的临界载荷公式进行了分析.     

Renaming Detection

Finding changed identifiers is important for understanding the difference between two versions of a program and for detecting and resolving conflicts while merging variants of a program together. Standard practice for differencing and merging relies on line based techniques that do not recognize renamed identifiers. The design and implementation of a tool to automatically detect renamed identifiers between two versions of a program is presented. The system uses an abstract representation of language constructs to enable language awareness without introducing language dependence. Modules for Java and Scheme have been written. The detector works with multiple file pairs, taking into account renamings that span several files. A case study is presented that demonstrates proof of concept. The detector is part of a suite of intelligent differencing and merging programs that exploit the static semantics of programming languages.     

Coordinated dispatching of proximity sensors for the surveillance of manoeuvring targets

The surveillance of a manoeuvring target with multiple sensors in a coordinated manner requires a method for selecting and positioning groups of sensors in real time. Herein, the principles of dispatching, as used for the effective operation of service vehicles, are considered. The object trajectory is first discretized into a number of demand instants (data acquisition times), to which groups of sensors are assigned, respectively. Heuristic rules are used to determine the composition of each sensor group by evaluating the potential contribution of each sensor. In the case of dynamic sensors, the position of each sensor with respect to the target is also specified. Our proposed approach aims to improve the quality of the surveillance data in three ways: (1) The assigned sensors are manoeuvred into “optimal” sensing positions, (2) the uncertainty of the measured data is mitigated through sensor fusion, and (3) the poses of the unassigned sensors are adjusted to ensure that the surveillance system can react to future object manoeuvres. If a priori target trajectory information is available, the system performance may be further improved by optimizing the initial pose of each sensor off-line. The advantages of dispatching dynamic sensors over similar static-sensor systems are demonstrated through comprehensive simulations.     

FIX工控软件开放性报表模块的研制

针对用户不能直接检索FIX工控组态软件私有数据库的限制，基于对其数据存储结构的分析，和国内外报表格式的比较，运用动态数据交换DDE（Dynamic Data Exchange)通信，WinSock网络通信技术，给出一种开发开放性服务器／客户模型报表模块的方法，该方法打破了客户不能直接检索组态软件数据库文件的约束，可开发符合现场要求的报表；并将组态软件数据文件转换成通用数据库格式文件，提高了工控软件的开放性，易于数据的交流和共享；此报表模块占用系统资源少，提高了工业监控系统的实时性。     

基于组态方式的电站性能分析系统

电站性能分析系统对于电厂机组的安全、可靠运行，提高系统的热经济性具有十分重要的意义。介绍了一种组态方式的电站性能分析系统，该系统依托于电站分布式控制系统DCS（Distributed Control System)，采用热平衡法，等效热降法，能损耗分析法等多种方法可在线计算出各种工况下的机组热经济性指标，进而进行热经济性分析，及时指导运行人员进行热力参数的调整，从而有效地提高电厂的运行效率。     

Cisco VLAN的技术实现及在金融组网中的应用

如何提高网络性能和安全隔离，一直是网络设计者和管理员较为关注的问题。主要讲述了在网络设计及应用中如何选择切实可行的技术进行VLAN的灵活划分，使得同一VLAN内的数据可自由通讯，而不同VLAN间的数据交流则需要通过第3层交换来完成，以提高带宽利用率，减少碰撞，增强网络应用的灵活性。     

基于PLC的水泥生产过程控制系统

针对水泥生产工艺的要求 ,介绍了基于PLC的DCS控制系统 ,阐述了控制系统的软硬件设计、通信网络设计、控制回路和主要功能 ,以PLC和DCS技术为核心 ,结合工业控制网络和组态软件 ,实现了全厂的集中管理和各控制站的分散控制     

造纸配浆自动控制系统的设计与实现

结合了当前造纸行业自动化的要求 ,介绍了纸浆配浆控制系统的设计与实现。系统具有功能强大、界面友好、调试容易、组态方便、运行稳定等优点     

一种实现对PCI配置空间访问的方法

提出了一种访问PCI配置空间的方法 ,对PCI总线配置空间的结构 ,NT的体系结构 ,NT驱动程序结构框架 ,以及PCI配置空间的访问机制和方法作了探讨 ,并结出了一个应用实例 .     

The Influence of Magnetic Permeability on the Configuration of magnetic Field in Helimak Device

The Helimak of USA is a plasma physics experimental device designed and built by CASIPP.Its configuration of magnetic field is of very importance during the operation of this device.In this paper,the influence of magnetic permeability on configuration of magnetic field will be discussed due to the effect of weld metal in the vacuum vessel of Helimak,and some conclusion is useful for some engineering designs of the fusion experimental device.