马科维兹资产组合选择模型的旋转算法

提出线性不等式组的一种旋转算法，并用其求解马科维兹资产组合选择模型，此算法每次迭代约需n^2次乘法和加法，其中n是模型中变量的数目，在微机上运行Delphi程序的实验结果表明，从上海和深圳股市1072支股票70期周末收盘价计算出20个最优投资组合仅需314次迭代和45s。     

New Exact Solutions to the Combined KdV and mKdV Equation

The modified mapping method is developed to obtain new exact solutions to the combined KdV and mKdV equation. The method is applicable to a large variety of nonlinear evolution equations, as long as odd- and even-order derivative terms do not coexist in the equation under consideration.     

Urea method for the synthesis of hydrotalcites

Mg-Al, Zn-Al and Ni-Al hydrotalcite-like compounds with high crystallinity were synthesized by using the decomposing property of urea at high temperature. The crystallinity and the regularly of the samples were much preferable to those synthesized by other methods. This revised version was published online in June 2006 with corrections to the Cover Date.     

LabVIEW在曲线拟合中的应用研究

介绍了LabVIEW中用于曲线拟合的子模块，对各子模块的曲线拟合理论作了介绍，重点介绍了非线性Lev-Mar拟合理论，并以例子辅助说明．     

基于线性元的电阻抗成像的数学模型和算法

本文讨论了电阻抗成像的数学模型，先利用有限元方法将其离散化，再把它转化为非线性优化问题，并给出了利用牛顿法求解这一问题的具体算法．最后进行了一系列数值仿真对比实验，证实了这一算法的有效性，指出了其中存在的问题．     

公共教育学课程中存在的主要问题与对策

公共教育学教学中存在着诸多的问题，概括起来主要有以下几个方面：一是有些教师授课违背教育学本身的要求；二是学生被动学习；三是部分教育学知识的老化；四是教学方法落后。这些问题的存在严重制约着合格教师的培养。为了解决教育学教学中存在的问题，必须坚持教学改革。第一，努力发挥教师的榜样和示范作用；第二，调动学生学习教育学的积极性；第三，坚决摒弃陈旧的知识，不断充实新内容；第四，改革教学方法。     

最小二乘法在石油闪点检测中的应用

以铂电阻分度函数为基础，利用最小二乘法算法，给出了拟合多项式，很好地解决了石油闪点检测系统中铂电阻不平衡电桥法测温方案中的非线性误差，其方便性和实用性已在应用中得到验证。     

Structural optimization design for large mirror

The system design must be started from the concept with low cost and high performance. In this point, the topological shape of the structure is very important in the view of the structural rigidities and light-weight design.In this paper, the optimization methodology is presented in the design stage of the large optical mirror. We obtain the optimal layout through the topology optimization and then design the details through the size or shape optimization for structural rigidity.     

Asymptotic Correction of More Sturm–Liouville Eigenvalue Estimates

The asymptotic correction technique of Paine, de Hoog and Anderssen can dramatically improve the accuracy of finite difference or finite element eigenvalues at negligible extra cost if closed form expressions are available for the errors in a simpler related problem. This paper gives closed form expressions for the errors in the eigenvalues of certain Sturm–Liouville problems obtained by various methods, thereby increasing the range of problems for which asymptotic correction can achieve maximum efficiency. It also investigates implementation of the method for more general problems.     

Cold compaction of ceramic powder: Computational analysis of the effect of pressing method and die shape

This paper deals with a computational analysis of the influence of the pressing method and part geometry on the final density distribution in the cold compaction process of ceramic alumina powders. The analysis is based on the explicit finite-element model proposed and validated in a previous study. The mechanical behavior of the processing material is described using a multisurface elastoplastic model, the modified Drucker-Prager/Cap model Published in Prikladnaya Mekhanika, Vol. 43, No. 10, pp. 129–134, October 2007.