岩体中渗流—热—应力耦合作用的理论研究

推导了岩体中热、流、因耦合问题的耦合控制方程,阐述了方程中各项的物理意义,并且对这一理论结果进行了初步验证。     

同步电机的正交磁化和直、交轴的耦合电抗

本文阐明了同步电机正交磁耦合效应的产生原因,对一台200MW汽轮发电机在定子单边激励和定、转子双边激励等多种情况下,算出其场图和直、交轴同步电抗x_d、x_q及直、交轴之间的耦合电抗x_(qd)、x_(dq)随饱和而变化的曲线,由此得出了一些理论和工程上有用的结论.     

钢筋混凝土剪力墙的延性

本文根据“钢筋混凝土弹塑性抗震结构的机构控制理论”,研究了R.C.剪力墙的延性问题。分析了影响因素,指出改善剪力墙延性的关键在于提高连系梁的延性。根据连系梁的不同跨高比,提出两种人工塑性铰构造方案。试验分析表明,采用本方案可以避免连系梁产生剪切破坏和剪切滑移,延性较大。通过设计,可控制使结构出现最佳耗能机构,提高R.C.剪力墙的抗震能力,并使内力、位移及延性分析简化。     

子波分析在声辐射和声散射中的应用

文章提出将子波分析用于求解声学中的边界积分方程,能提高现有边界元方法解决工程问题的能力。在子波分析于声辐射和声散射的应用研究中,提出了把积分核函数用级数展开,建立频率响应函数计算的频率迭代技术,大大提高了频率响应函数的计算效率。讨论了子波分析在声学工程数值计算中的研究前景。     

Mixed Dimensional Coupling in Finite Element Stress Analysis

Many analysis models utilize finite elements of reduced dimension. However, to capture stress concentrations at local details, it would be desirable to combine the reduced dimensional element types with higher dimensional elements in a single finite element model. It is therefore important in such cases to integrate into the analyses some scheme for coupling the element types that conforms to the governing equations of the problem. In this paper, a novel method that can correctly couple beams to solids, beams to shells and shells to solids for elastic problems is presented. The approach adopted is to equate the work done on either side of the interface between dimensions, and this leads to multi-point constraint equations, thus providing a relationship among nodal degrees of freedom between the differing element types. Example results show that the proposed technique does not introduce any spurious stresses at the dimensional interfaces. ID="A1" Correspondence and offprint requests to: C. G. Armstrong, School of Mechanical and Manufacturing Engineering, The Queen's University of Belfast, Ashby Building, Stranmillis Road, Belfast BT9 5AH, Northern Ireland. E-mail: c.armstrong@qub.ac.uk     

Design principles for inductive inference procedures

The behavior of inductive inference procedures depending on the content of a learning sample is analyzed. It is shown that if a learning sample contains no information on some class of objects or statistical information on a priori probabilities of classes, then any procedure performs unpredictably badly and its error is strictly positive. __________ Translated from Kibernetika i Sistemnyi Analiz, No. 4, pp. 51–63, July–August 2006.     

一种基于BP神经网络的解耦控制方法及其在微型燃机控制中应用的研究

分析了带回热器的微型燃机运行时各变量之间的耦合关系，针对微型燃机运行时参数多变、过程复杂的特点，提出了应用解耦控制算法控制燃机运行的思想；把BP神经网络应用在解耦控制中，结合传统的PID控制，提出了一种新的置解耦网络于调节器之前的BP神经网络解耦控制算法．仿真及实验结果表明此种控制算法具有良好的控制效果．     

用时域有限元边界元耦合法计算三维瞬态涡流场

文中首次应用时域有限元一边界元耦合法（T-FEBEM）研究了涡流检测中有限厚平板导体中含有窄裂缝时的瞬态涡流场。采用伽辽金加权余量法，推导出A-φ位函数的时域有限元—边界元耦合算法，讨论了确定时间步长的基本方法，用不完全分解共轭梯度法（ICCG）求解线性方程组。研究了平板导体中不同深度裂缝的时域响应，并与频域有限元—边界元耦合法（FEBEM）和付里叶变换方法所得结果进行了对比。计算结果表明，时域有限元—边界元耦合法效率更高，是一种求解瞬态开域涡流场的有效方法。     

用测向力显微镜对力／电／热耦合作用下金表面力学行为的研究

对微构件力／电／热等多域场下力学行为的研究有着重要的意义，利用原子力显微镜采用纳米压痕法对样品金在力-电-热耦合作用下的表面力学性能进行了研究，实验表明在压痕过程中，无论在无电场作用下还是有电场作用下，压痕周围的金属由于挤压形成了凸起，从扫描得到的形貌图中可以明显的看出，压痕周围的亮区为材料被挤出的区域．此外，在外加直流电场作用下，随电流的增大，硬度值有增大的趋势，而残余压痕和弹性模量都呈现减小的趋势．     

Loose Coupling and Healthcare Organizations: Deployment Strategies for Groupware

Healthcare organizations are often organized in a modular, loosely coupled fashion where separate and semi-autonomous work units specialize in different areas of care delivery. This partitioning allows each unit to adapt to emerging practice standards in its area of expertise and to adjust to its local work environment. However, organizational loose coupling can limit the flow of information within organizations and can make it difficult to coordinate services when patients’ care is dependent on professionals from more than one unit. Groupware systems have the potential to improve coordination and information access in healthcare organizations. However, modularity and loose coupling make it difficult to introduce new systems when they span more than one unit, since authority is not always centralized and since perceptions and frames of reference on new deployments differ across units. In this paper, we define a groupware deployment framework for loosely coupled healthcare organizations that has two parts: a set of deployment challenges and a set of deployment strategies. The deployment challenges include: difficulties centralizing deployments, perceptions of inequity, role conflicts, and problems achieving critical mass. The deployment strategies outline a preliminary set of approaches for addressing the difficulties of deploying CSCW systems in loosely coupled healthcare organizations. We illustrate the framework by presenting a case study of a groupware deployment in a home care setting.