箔式镱应カ传感器及试验研究

为测量弹药爆炸及武器侵彻等强冲击荷载下岩体及混凝土结构中应力，研制了箔式镱应力传感器。对传感器工作原理进行了分析，研究出了镱敏感元件的加工工艺，合理设计了传感器结构。对传感器进行了试验研究，试验表明传感器具有横向效应小、量程范围宽、过载能力强、频响高、结构简单、使用方便等优点，可广泛应用于强冲击荷载下混凝土或岩石等介质中的应力测试。     

地区电网无功电压优化运行与安全控制

针对地区电网(开式电网)的无功电压控制,从全电网的角度阐述了利用调度自动化系统的“四遥”功能,实现地区电网无功电压优化运行集中实时闭环控制的原理和方法,以及控制过程中的安全策略,并以“泰州城区(海陵、高港两区)电网无功电压优化运行集中控制系统”为实例说明了该理论在实际系统中的应用。     

非结构网格上求解中子输运方程的并行流水线Sn扫描算法

间断有限元离散纵标方法(Sn)是广泛应用于求解高维非定常中子输运方程的数值方法,它涉及几何网格空间、速度相空间和中子能群的离散,计算量很大．该文基于非结构网格,提出了基于区域分解的并行流水线Sn扫描算法,通过设计具有不同内在并行度和通信面体比的区域分解方法和队列插入算法,对两个不同物理模型,分别使用两台并行机的92个和256个CPU,获得72倍和78倍以上的加速．可扩展性能分析表明,算法的性能非常依赖于并行机的点对点通信延迟．     

Finite element analysis of vortex shedding oscillations from cylinders in the straight channel

In this paper a GCL (Geometry Conservation Law) – preserving finite element model is developed to simulate the fluid-structure interaction phenomena. The boundary locations are part of the solution procedures. Within the moving grid framework, the employed numerical method involves the operator splitting technique, balance tensor diffusivity (BTD), Runge-Kutta time-stepping method, and an element-by-element conjugate gradient iterative solver. Flows around a self-vibrating cylinder and elastically supported cylinders are investigated to validate the present method. The simulated results agree well with available data in the literature. The lock-in phenomenon that may cause the unstable motion of cylinders is also revealed. It is significant from the simulated 2×2 four cylinders result that the rear two cylinders approach to each other at a time earlier than the front two ones.     

A grid middleware for distributed Java computing with MPI binding and process migration supports

“Grid” computing has emerged as an important new research field. With years of efforts, grid researchers have successfully developed grid technologies including security solutions,resource management protocols, information query protocols, and data management services. How-ever, as the ultimate goal of grid computing is to design an infrastructure which supports dynarnic,cross-organizational resource sharing, there is a need of solutions for efficient and transparent task re-scheduling in the grid. In this research, a new grid middleware is proposed, called G-JavaMPI. This middleware adds the parallel computing capability of Java to the grid with the support of a Grid-enabled message passing interface (MPI) for inter-process communication between Java processes executed at dif-ferent grid points. A special feature of the proposed G-JavaMPI is the support of Java process migration with post-migration message redirection. With these supports, it is possible to migrate executing Java process from site to site for continuous computation, if some site is scheduled to be turned down for system reconfiguration. Moreover, the proposed G-JavaMPI middleware is very portable since it requires no modification of underlying OS, Java virtual machine, and MPI package. Preliminary performance tests have been conducted. The proposed mechanisms have shown good migration efficiency in a simulated grid environment.     

A fast algorithm for an envelope construction of a huge set of topologically consistent polygons

This paper describes an efficient algorithm for the determination of an envelope of a set of polygons. The polygons have to be aligned along their borders – the case which, for example, appears in geographic information systems. The edges, which belong to two neighbouring polygons, are called twin edges, and are eliminated first. To accelerate the geometric search, a two-level uniform plane subdivision structure is proposed. The remaining non-twin edges belong to the envelope, and they have to be joined to form the simple polygons at the end. For this task, a new algorithm has been developed. At the end, spatial relationships between resulting polygons are established. The whole algorithm for envelope determination works in expected time O(n log n) using O(n) memory space, where n is the total number of edges belonging to the input polygons. In the last part of the paper, practical results using data from a geographical database are considered.     

基于网格的"数字黄河"框架与平台技术研究

网格是构筑在互联网上的一组新兴技术,基于网格的框架结构,提出建立基于开放式网格服务体系结构（OG-SA）的“数字黄河”信息网格系统,作为整个“数字黄河”工程应用层的基础,以实现各种资源的高度共享,信息的实时处理,良好的人机交互环境和编程开发环境。通过开展对网格技术的研究,实现“数字黄河”工程远期建设的应用需求,即海量信息的存储,管理与共享;网络化的信息处理,功能复用和分布式对象之间的互操作。     

基于方面图技术的三维运动目标识别

三维目标在不同的视点下呈现不同的姿态 ,所得的二维视图也不尽相同 ,因此三维目标识别是一个较为复杂的问题 .为此提出了通过图象序列和图象序列之间的转移关系 ,根据胜者为王的原则来识别三维目标的方法 .该方法采用极指数栅格技术和傅立叶变换相结合得到目标的轮廓不变量 ;用神经网络结合方面图技术 ,通过识别运动目标图象序列来识别三维运动目标 ,实现了一个目标识别系统 .实验结果证明 ,此方法可以有效地用于三维运动目标的识别     

变电站接地网计算机辅助设计

开发一界面友好的“变电站接地网计算机辅助设计”软件。在土壤结构复杂和设计过程繁琐的情况下,利用该软件,将有助于完成高效的接地网设计。     

嵌补式多块网格技术

结合搭接和嵌套网格的特点,提出了嵌补式多块网格技术。使得网格生成和流场计算都得到了相应的简化。方法简单直观,并且能够严格保证网格界面的通量守恒。将该方法应用于三维增升装置的计算中获得了良好的效果,验证了方法的正确及可行性。