弧焊机器人控制系统

本文介绍一种二级计算机控制的弧焊机器人控制系统。在考虑相邻关节影响的条件下，对弧焊机器人控制系统的硬件电路和控制方法进行了分析和设计．     

数据流图的存贮模型

本文给出了一个数据流图的存贮模型。并在此基础上，给出了数据流图的操作算法。可以解决ＳＡ方法中的文档管理。     

多变量自校正控制计算机辅助设计软件系统

本文介绍了一个可帮助用户进行多变量自校正控制系统设计,而使用户不必了解算法细节的计算机辅助设计(CAD)软件系统;它既包括一些经典的自校正控制算法,又引入了一些近年来新研究的成果。使用情况表明,该系统算法先进,使用方便,控制效果较好,是一个实用的软件工具。     

汽车拖拉机转向机构的优化设计

本文提出用一种新的时间离散化方法对汽车拖拉机的转向机构进行优化设计．该离散化方法是按被实现函数变化率的大小划分时间单元，在被实现函数变化率较大的区域，分点较密；在率化率较小的区域，分点较稀．笔者还分别用等间距的时间离散化及切比雪夫时间离散化方法，对同一机构使用同一种优化方法进行了优化设计，并将三种计算结果进行了比较．结果表明，笔者提出的方法，没有增加计算工作量，而能提高计算精度．     

关于非平凡的黎斯算子

讨论一般巴拿赫空间上非紧的黎斯算子存在问题,说明各经典巴拿赫空间上确有这种非平凡的黎斯算子,给出一类空间,其上的根算子理想与严格奇异算子理想是不重合的。     

The harmonic decomposition reconstruction for the exponential radon transform

The exponential Radon transform, a generalization of the Radon transform, is defined and studied as a mapping of function spaces. It is represented in terms of Fourier transform of its domain and range, and this leads to the harmonic decomposition reconstruction. The results are similar results of Tretiak and Metz. Foundation item: Supported by the National Natural Science Foundation of China (No. 19971064), Key Project of Science and Technology of Hubei Province Education Committee. Biography: Wang Jin-ping (1963-), male, Ph.D. candidate, research direction: numberical solution of singular integral equation and integral transformation etc.     

高校思想政治工作的困境及其对策

思想政治工作被视为一切工作的“生命线”，其地位和作用不言而喻。然而，就目前高校学生思想政治教育工作而言，受到国际，国内的政治，经济环境的影响，以及高校学生思想政治教育工作本身的诸多困扰，使高校的学生思想政治教育工作面临着严峻的挑战。如何研究新情况，形成新认识，开辟新境界，解决新问题巳是不可回避的课题。     

接触载荷作用下的表面裂纹分析

用边界积分方法分析了表面裂纹在接触载荷作用下的张开位移和应力强度因子，该方法将埋在无穷大弹性介质中裂纹模拟为连续分布的位错环，根据两个位错环之间的相互作用能可以得到弹性体的应变能，对弹性体的势能取极值，可以得到关于裂纹张开位移的边界积分方程，通过把半空间的边界模拟成一个包含在无穷大弹性介质中大裂纹，该方法能用已有的边界积分方法很好的处理具有任意表面形状的表面裂纹，文中算例分析了不同倾角的表面裂纹在法向和切向接触载荷作用下，裂纹尖端的应力强度因子，其结果对于分析路面表面裂纹的扩展具有重要意义。     

Resource Search in Unstructured Peer-to-Peer System Based on Multiple-Tree Overlay Structure

We propose a multiple-tree overlay structure for resource discovery in unstructured P2P systems. Peers that have similar interests or hold similar type of resources will be grouped into a tree-like cluster. We exploit the heterogeneity of peers in each cluster by connecting peers with more capacities closer to the root of the tree. The capacity of a peer can be defined in different ways （e.g. higher network bandwidth, larger disk space, more data items of a certain type etc.） according to different needs of users or applications.     

On the verge of <Emphasis Type="Italic">Umdeutung</Emphasis> in Minnesota: Van Vleck and the correspondence principle. Part one

In October 1924, The Physical Review, a relatively minor journal at the time, published a remarkable two-part paper by John H. Van Vleck, working in virtual isolation at the University of Minnesota. Using Bohr’s correspondence principle and Einstein’s quantum theory of radiation along with advanced techniques from classical mechanics, Van Vleck showed that quantum formulae for emission, absorption, and dispersion of radiation merge with their classical counterparts in the limit of high quantum numbers. For modern readers Van Vleck’s paper is much easier to follow than the famous paper by Kramers and Heisenberg on dispersion theory, which covers similar terrain and is widely credited to have led directly to Heisenberg’s Umdeutung paper. This makes Van Vleck’s paper extremely valuable for the reconstruction of the genesis of matrix mechanics. It also makes it tempting to ask why Van Vleck did not take the next step and develop matrix mechanics himself. This paper was written as part of a joint project in the history of quantum physics of the Max Planck Institut für Wissenschaftsgeschichte and the Fritz-Haber-Institut in Berlin.