高阶系统的故障发现及人机交互决策系统

本文研究了系统监控中的故障发现问题．提出了一种以图形方式进行人机交互的故障发现决策方法，并且应用大系统理论中的分块式卡尔曼滤波方法解决了高阶系统的监控问题，最后通过仿真实验，验证了该方法的有效性．     

非线性电路故障诊断的理论和算法

本文研究非线性模拟电路的故障诊断理论和方法。在作者提出的故障诊断方程的基础上，基于一种新的雅可比矩阵计算方法和迭代算法，文中把一般性的故障诊断理论引伸到非线性模拟电路的领域。     

线性电路故障诊断的通用性理论及其算法

本文研究线性模拟电路故障诊断的理论和方法，在作者提出的故障诊断方程的基础上，基于一种新的雅可比矩阵计算方法和迭代算法，给出了能求解所有线性模拟电路故障诊断问题的一般性方法。     

模拟电路故障定数的理论和方法

本文研究模拟电路的故障定数问题，这是作者提出的一个新概念，在最近２０年的故障诊断研究中，涉及到故障定位和故障定值，本文首先指出，故障定数、故障定痊和故障定值三者乃是整个故障诊断的三个主题，并给出了模拟电路故障定数的理论和方法。     

Landau theory of martensitic transformation in Fe-Mn-Si based alloys

Considering the features of martensitic transformation in Fe-Mn-Si based alloys, the Landau theory is established by introducing the density of stacking faults as a new order parameter ηand the corresponding free energy function. By using such an order parameter, the stacking fault mechanism of the nucleation and growth for the γ(fcc)→ε(hcp) martensitic transformation can be reasonably explained, and a further detailed mechanism is proposed. The stacking faults are generated and overlapped in an irregular form at the beginning and then becoming regular to create some transition structures till a stable phase forms at a certain temperature. The importance of the interface soliton is to complete the transformations into various structures of martensite but not the twinned one. The thermodynamics of fcc→hcp transformation and those between different transition structures are described by the free energy function established in the present note.     

生产过程故障诊断方法研究现状及展望

回顾了过程故障诊断技术的研究历史,对已形成的故障诊断方法分三类进行了总结,特别对近年来形成的基于数据分析的方法进行了分析,最后指出了过程故障诊断技术现存的问题,同时指明了故障的预报方法、辨识方法、诊断系统的鲁棒性和非线性研究以及大型、实用故障系统的构建将是该领域研究中近期的发展方向。     

Research on Fault Tolerant Scheduling Algorithms of Web Cluster Based on Probability

Aiming at the soft real time fault tolerant demand of critical web applications at present, such as E-commerce, a new fault tolerant scheduling algorithm based on probability is proposed. ““““““““Ib achieve fault tolerant scheduling, the primary/slave backup technology is applied on the basis of task‘s self similar accessing characteristics, when the primary task completed successfully, the resources allocated for the slave task are reclaimed, thus advancing system‘s efficiency. Experimental results demonstrate on the premise of satisfying system‘s certain fault tolerant probability, task‘s schedulabilistic probability is improved, especially, the higher task‘s self similar degree is, the more obviously the utilization of system resources is enhanced.     

Reliability Analysis of Sensor Networks

To Integrate the capacity of sensing, communication, computing, and actuating, one of the compelling technological advances of these years has been the appearance of distributed wireless sensor network （DSN） for information gathering tasks. In order to save the energy, multi-hop routing between the sensor nodes and the sink node is necessary because of limited resource. In addition, the unpredictable conditional factors make the sensor nodes unreliable. In this paper, the reliability of routing designed for sensor network and some dependability issues of DSN, such as MTTF （mean time to failure） and the probability of connectivity between the sensor nodes and the sink node are analyzed. Unfortunately, we could not obtain the accurate result for the arbitrary network topology, which is # P-hard problem. And the reliability analysis of restricted topologies clustering-based is given. The method proposed in this paper will show us a constructive idea about how to place energyconstrained sensor nodes in the network efficiently from the prospective of reliability.     

Helium isotopic compositions in fluid inclusions of the Gangxi fault belt in the Huanghua Depression, Bohai Bay Basin

Helium is a trace constituent in natural gases and is the lightest element of all rare gases. Formed during natural nuclear processes, helium is chemically stable. Due to its strong diffusibility and permeability, helium can be used as a very sensitive tracer. Helium has two natural stable isotopes, 3He and 4He. 3He originates from the universal nebulae when the earth was formed, and 4He mainly originates from the radioactive disintegration of elements in the crust, such as U and Th [1]. In…     

考虑压缩失效时埋地管线跨地震断层的最佳交角研究

在断层错动下埋地管线跨断层的最佳交角研究方面,已有方法均以管道受拉失效为基本假定,未考虑管道压缩失效的情况.本文利用管体壳模型有限元方法进行了跨断层管线在断层错动下管体反应的计算分析,在考虑管材特性、管道尺寸及地基土特性多种影响因素的情况下,探讨了在仅控制轴向拉伸应变值和同时控制轴向拉伸应变值与轴向压缩应变值两种管道失效控制准则下管道的失效问题,分析了不同失效控制准则对管线跨断层的最佳交角的影响.发现失效控制准则是确定最佳交角值的关键因素,而且基于同时考虑拉伸和压缩失效的控制准则,管线跨断层的最佳交角应在70°左右.