Behavior of pre-stress group anchors——Theory approach and model

First of all the pre-stress group anchor ropes are resolved into twosub-systems: the stable rock stand lateral resistance load and inner bonding sectionstand lateral resistance load and pre-stress load. Then, discretization of everysub-system was carried on and it is assumed that different micro-sections possessuniform distribution side resistance. On the basis of Mindlin stress solution, stress overlay principle, modified layered-summation method as well as the load transfer method, westudy the anchor group effect and present a theory model which calculates the anchorgroup effect and establishes the relevant iterate standard.     

Two-machine open shop scheduling with secondary criteria

This paper considers two-machine open shop problems with secondary criteria where the primary criterion is the minimization of makespan and the secondary criterion is the minimization of the total flow time, total weighted flow time, or total weighted tardiness time. In view of the strongly NP-hard nature of these problems, two polynomially solvable special cases are given and constructive heuristic algorithms based on insertion techniques are developed. A strongly connected neighborhood structure is derived and used to develop effective iterative heuristic algorithms by incorporating iterative improvement, simulated annealing and multi-start procedures. The proposed insertion and iterative heuristic algorithms are empirically evaluated by solving problem instances with up to 80 jobs.     

迭代函数系IFS吸引子的通用参数控制系统

讨论一个通用的参数控制方法，通过改变参数控制IFS吸引子的形状，最终生成不同的计算机图像。该方法首先给出两个原始三角图形，通过对两者位置和形状的改变得到IFS码，并通过不断引入新的三角形并改变其位置和形状来影响IFS吸引子的外观。最后，给出了利用此参数控制方法进行仿真试验所得到的几个经典IFS吸引子的图形。     

Design and Calibration of an Opto-mechanical Appliance for 3D Non-contact Orthopedic Measurements Part II: Calibration Methodology and Experimental Results

A multistep iterative calibration methodology for the opto-mechanical system introduced in Part I is proposed. The methodology makes use of a monoview coplanar set of control points, whose number has been determined on the basis of both geometrical considerations and the results of a statistical analysis aiming at assessing the procedure stability in the case of noisy image data. The calibration procedure is carried out comparing the theoretical and observed images of the calibration pattern. Both synthetic and real data have been employed to test the calibration procedure, which proved to be accurate and efficient. The experimental results achieved by the calibrated system are satisfactory in terms of measurement precision.     

PVM环境下有限元方程组的异步并行迭代算法

提出了ＰＶＭ环境下解椭圆型边值问题的有限元方程组的异步并行迭代算法，给出了算法的两种实现方案，并进行了讨论     

通用一维河网不恒定流软件的研究

本文讨论了通用一维河网不稳定流数值计算软件的数学物理基础：(1)扩展的圣维南方程组及其有限差分方程的牛顿迭代方程组；(2)特殊结点的特殊方程及迭代方程；(3)边界条件和初始条件；(4)系统方程的装配和特殊的高斯消元法.最后用一个例子来与其它的软件进行比较。     

Migration Processes II: The Discrete Case

Following the study of migration processes in the continuous domain in Part I of this paper, we reformulate the concept of migration in the discrete domain (Z^m) and define Discrete Migration Processes (DMP). We demonstrate that this model is a natural discrete representation of the continuous model and maintains the model's features in a qualitative sense. We show that under discrete migration any discrete set shrinks to a limit in finitely many iterations. The discrete representation provides an advantageous basis for digitally implementing the MP model. Using this implementation we illustrate the discrete migration of various types of sets under various types of constraints.     

病态线性系统的控制模型设计及其迭代算法

建立一种解决病态线性系统的控制模型，得到求解病态线性系统近似解的一种新算法．该算法为病态线性系统利用计算机迭代求解提供了直接的算法依据，同时也适合于常态线性系统近似解的计算．最后将新算法与传统的Gauss—Seidel算法进行比较．     

可逆冷轧机负荷分配原理及应用

根据可逆冷轧机的生产特点 ,采用一种通过直接求解非线性方程组来确定负荷分配的方法。通过实例证明 ,该方法有很高的精度 ,可满足计算机在线控制的要求 ,适合在生产中应用     

迭代法在水力计算中的应用

水利工程设计中常用图解或试算来推求水力要素.这些方法既繁杂又不方便,且精度较差.随着计算机应用的普及,迭代计算越来越受到人们的重视.文章探讨了迭代法在水力计算中的应用,给出了渠道底宽、正常水深、临界水深的迭代公式和计算方法,以及水工建筑物消能防冲计算中收缩水深的迭代公式和计算方法.这些迭代公式和计算方法在工程设计中具有一定的实用价值,并可应用程序进行计算.