用拉压不同模量理论计算支座移动引起的超静定结构内力

For statically indeterminate structure, the internal force will be changed with the translation of the supports, because the internal force is related to the absolute value of the stiffness EI. When the tension is different with the compression modulus, EI is the function of internal force and is not constant any more that is different from classic mechanics. In the other words, it is a nonlinear problem to calculate the internal force. The expression for neutral axis of the statically indeterminate structure was derived in the paper. The iterative program for nonlinear internal force was compiled. One case study was presented to illustrate the difference between the results using the different modulus theory and the single modulus theory as in classical mechanics. Finally, some reasonable suggestions were made for the different modulus structures.     

全光波长变换器及其在光网络中的应用

All optical network (AON) is a hot topic in recentstudies of optical fiber communications . Key tech-niques in AONinclude optical switching/routing,opti-cal cross connection ( OXC) , all optical wavelengthconversion (AOWC) ,all optical buffering,etc. Opti…     

Multi-period model of portfolio investment and adjustment based on hybrid genetic algorithm

This paper proposes a multi-period portfolio investment model with class constraints, transaction cost, and indivisible securities. When an investor joins the securities market for the first time, he should decide on portfolio investment based on the practical conditions of securities market. In addition, investors should adjust the portfolio according to market changes, changing or not changing the category of risky securities. Markowitz mean-variance approach is applied to the multi-period portfolio selection problems. Because the sub-models are optimal mixed integer program, whose objective function is not unimodal and feasible set is with a particular structure, traditional optimization method usually fails to find a globally optimal solution. So this paper employs the hybrid genetic algorithm to solve the problem. Investment policies that accord with finance market and are easy to operate for investors are put forward with an illustration of application.     

Contemporary trends and developments in early childhood education in China

Early childhood education in China has gone through a century‐long development process and has made great progress in the past two decades. Contemporary early childhood education is becoming diverse in its forms and educational approaches, and is aligning itself with the increasingly open and diversified society. It is clear that early childhood education in China is strongly influenced by sociocultural changes and reflects the hybrid of traditional, communist and Western cultures. We should re‐think what happened in past years and continue to promote reform and development in early childhood education.     

矩阵方程AXB+CXD=F的两种参数迭代解法的讨论

讨论了求解线性矩阵方程AXB CXD=F的两种参数迭代方法,并分别分析了两种迭代方法的收敛性。     

The Market for Picasso Prints: A Hybrid Model Approach

Two basic approaches have been used by the literature focusing on the return to holding artistic works: the hedonic price model and the repeat-sales model. This paper provides a procedure for jointly estimating the two models in a way that take advantages of the unique information contained in each. A semiannual price index for Picasso prints is estimated by using a model derived from the basic framework of the hybrid models. The empirical results suggest that the hybrid model provides the most precisely estimated price index by reducing the level of price volatility.JEL Classification: C5, Z1p     

一种新型混合遗传算法及其应用

根据遗传算法和人工蜂群算法各自特点,在遗传算法框架上,利用人工蜂群算法中跟随蜂选择\搜索策略,代替遗传算法中的变异操作,提出一种基于人工蜂群算法跟随蜂选择\搜索的混合遗传算法,并应用到0-1背包问题中。实验结果表明了该算法的有效性。     

我国社会治安综合治理的模式选择

社会治安综合治理是当代中国的一大创造,社会转型初期开始实行的社会治安综合治理模式难以应对多重社会矛盾的挑战和满足社会转型期公域治理的需要。鉴于我国公域之治对软法的倚重,现时期应以软法主导、硬法辅助和以软法整合分散硬法的两种路径构建我国社会治安综合治理的新模式。     

混合动力汽车(HEV)技术分析

混合动力汽车由于在节能与减排方面的明显优势而倍受关注。本文论述了混合动力常用结构形式、特点及混合动力汽车的控制策略,并介绍了一种基于模糊技术的并联型控制策略;插电式混合动力更节能环保,但推广还有较大难题。     

3种类型混合动力汽车控制策略的分析

简述了混合动力汽车几种典型的布置结构,并对各种布置型式的控制系统的控制策略作了相关介绍和优缺点分析.在此基础上,探讨了混合动力汽车还需要解决的问题和应用前景.