栾川钼矿田的开发和利用

介绍了栾川钼矿资源概况及开发现状,分析了栾川钼资源在开发利用过程中存在的问题,提出了今后对栾川钼矿资源综合开发利用的建议与对策。     

The Identification Problem for a Mixture of Observations from Two Normal Populations

A comparative study is made of the performances of various procedures for identifying the population of origin of each observation in a sample made up of observations from two normal populations, the parameters of which may or may not be known.     

A Note on the Use of Discrete Convolutions

A convolution method is used to solve a tolerance stack-up problem. The input random variables can be of any form. A complete frequency distribution of the possible outcomes is generated in the process of obtaining the desired probability of exceeding the permissible tolerance. (This method has also proved valuable in the actuarial field; for example, in determining the probability that total insurance claims will not exceed a given level.)     

改进的用于半导体器件综合系统的遗传算法

本文对应用于器件综合系统的遗传算法GENOCOP进行了改进.将实数设计空间根据参数的工艺精度影响转换为整型空间,并加入适应性复合算子利用已经得到的点来扩展和开发准可行空间.使其保持有效搜索到可行解的特性的同时,在同等的算法设置下,提高了对可行空间的覆盖率(约2.87倍),可以帮助设计人员更有效的设计可工作的器件.     

建筑抗震计算模型的几个问题探讨

本文从建筑结构模型计算出发,从嵌固端、建筑结构抗倒塌和地震输入的不一致激励出发,探讨了建模时一些问题并提出了一些看法供设计者参考讨论.     

The Decomposition Method For Solving Of A Class Of Singular Two-Point Boundary Value Problems

In this paper, a class of nonlinear singular two-point boundary value problems are solved by using Adomian's decomposition methods. The approximate solution of this problem is calculated in the form of series with easily computable components. Finally, we give a nonlinear numerical example.     

Numerical Solution of Singularly Perturbed Non-Linear Two Point Boundary Value Problems by Spline in Compression

Singularly perturbed nonlinear two point boundary value problems are considered. The original nonlinear equation is linearized using quasilinearization. Difference schemes are derived for linear case using spline in compression and are used to solve each linear equation obtained via quasilinearization. Second order uniform convergence is achieved. Numerical examples are given in support of the theoretical results.     

Projections and preconditioning for inconsistent least-squares problems

In this paper we describe two iterative algorithms for the numerical solution of linear least-squares problems. They are based on a combination between an extension of the classical Kaczmarzs projections method (Popa [5]) and an approximate orthogonalization technique due to Kovarik. We prove that both new algorithms converge to any solution of an inconsistent and rank-defficient least-squares problem (with respect to the choice of the initial approxi-mation), the convergence being much faster than for the classical Kaczmarz - like methods. Some numerical experiments on a first kind integral equation are described.     

关于怀柔区农村城市化的几点思考

本文介绍了怀柔区农村城市化正在建设的实际情况,提出了怀柔区农村城市化建设所面临的问题并针对这些具体问题给出具体可行的建议与解决措施。     

高技术产业化项目经济评价问题分析

结合工作实际论述了国家高技术产业发展项目的内容及特点.通过实例分析,找出了该类项目存在的技术、市场风险等问题,提出了评价中应注意的主要问题,以使评价结论更为客观合理,成为前期决策的依据.