消解方程y=C_(0e)~(-kt)的直接寻优拟合法

提出了拟合消解方程y=C_0e(-kt)的直接寻优法。对27套农药残留试验数据的计算表明该方法的剩余平方和比经典方法和加权回归法的都小,其相关指数也都比后两者的更接近1。因此,直接寻优法是三种方法中效果最好的。     

与最新LEP实验结果一致的现实的大统一前子模型

CERN1989年下半年安装完毕的正负电子对撞机LEP给出的最新实验结果表明,标准模型中存在具有轻中微子的夸克和轻子的代数是3。按此结果要求,我们得出一个手征的、给出三代轻粒子的现实的禁闭弱作用大统一前子模型。     

Development of City Transport System and Two-wheel Vehicles

Based on the study on the city transport systems of some typical cities worldwide, this paper put forward that each city transport system has its own development mode, which is influenced by the city development plan, economic development level, traveling vehicle composition etc.. When some problems occur, such as the congestions caused by contradiction between the road capacity and vehicle composition, the city transport system may come into temporary maturity period. If the improvement for road system is limited meanwhile, optimized structure of vehicle composition should be an effective solution in this case. With the development of economy-internationalization, the development speed of city transport modernization is rapid. When traveling easiness is conflicting with efficiency, the advantages of public transport system become more obvious. Correspondingly, the superiority of two-wheel vehicles will reappear. Though the important function of two-wheel vehicles for alleviating city traffic problems i     

搅拌磨超细粉磨金精矿工艺的优化

研究了搅拌磨超细粉磨金精矿的工艺,考察了主要参数对粉磨效果的影响.结果表明,通过优化磨矿过程中各种影响因素,可以获得细度-20μm＞99%的金精矿产品.     

自然科学领域著名期刊简介--Science周刊

Science杂志于 1880年创刊 ,现由美国科学促进会 (TheAmericanAssociationfortheAdvancementofScience,AAAS)主办 ,是具有科学新闻和学术期刊双重特点的国际性周刊 ,也是世界上传播范围最广的科学刊物之一 ,以发表具有重要意义的原创性科研报告为主。本文旨在介绍该刊的办刊宗旨、征稿要求及评审程序 ,以期能够更好地了解Sci ence,提高投稿率和录用率 ,把我们出色的科研成果展示给世界 ;同时也能够通过阅读Science,把握最前沿的科学研究动态 ,加强我国与世界科学界的联系。     

嬗变:影视艺术的文化特性思考

在商品化、市场化日益推进的今天，影视化以其特有的“亲和力”迅速“笼络”人心，解构并重塑着观众已的思维理念和价值判断。同时，其自身的角色变得奇特而又模糊，进而升华为自身坐标的多元化，逐渐“陌生化”并背离其原来的轨道定位，并在其运动演变中产生嬗变。这种影视化的嬗变主要体现在以下三个层面：作为化本身层面的嬗变，作为商品价值层面的嬗变，作为意识形态层面的嬗变。     

概率门量子进化算法

量子进化算法(QEA)比传统进化算法(EA)有更好的种群多样性和全局寻优能力，但它采用概率操作过程，具有随机性和盲目性．将量子进化算法中的旋转门以概率门代替，在概率分析及实例验证的基础上，说明概率门量子进化算法(PGQEA)能使得对种群选取过程控制在全局优化的方向下，并且能更快地收敛于最优解。     

基于Java RMI的网络信息监控系统设计

在分析JavaRMI技术的基础上 ,论述了JavaRMI实现Java同构环境下的分布式对象计算的关键技术 ,同时探讨了JavaRMI体系结构 .结合网络协议分析的应用技术 ,提出一个基于JavaRMI的分布式网络信息监控系统模型 ,通过系统各分监控点对公共上网场所的上网络信息进行监控     

Multi-Echelon Inventory Model with Emergency Lateral Transshipments

In multi-echelon inventory systems, since neighboring retailers are located at shorter distances than the supplier, a retailer may seek stock from them when it is out of stock, that is, emergency lateral transshipments between retailers are commonly practiced to provide improved order fill rate. In this paper, we develop a continuous review multi-echelon model for consumable products when emergency lateral transshipments between retailers are allowed. Approximations are derived for the expected level of cost and order fill rate of retailers. Simulations conducted to test the validity of the approximate analytical model indicate that it performs very well in the cases where fairly high service levels are required. Numerical examples are also presented to illustrate the effects of emergency lateral transshipments on the performance criteria of inventory systems. The results indicate that emergency lateral transshipments will lead to a significant increase in the retailer order fail rate and this initiative is most suitable for items with a high penalty cost, or where lost sales are likely.     

Novel Newton’s learning algorithm of neural networks

1 .INTRODUCTIONBP methodis a widely used classical learning algo-rithmof Neural Networks . Whileit has two short-ages ,i .e .slowconvergence rate and existinglocalmini mum of the cost function. Many new algo-rithms such as modification methods of BP meth-od, conjugate gradient methods , RLS methods ,quasi-Newton methods , evolving learning meth-ods ,chaos-learning algorithms have been proposedso far[1 ~7]. However ,these novel algorithms neverdirectly utilize the 2-ed order differentia…