The structure and the sufficint and necessary conditions for generalized statistically self-similar sets

We constructed a class of generalized statistically self-similar sets and give the necessary and sufficent conditions to ensure a random recursive set being a generalized statistically self-similar set. The statistically self-similar sets defined by Hutchinson, Falconer, Graf are the special cases of ours. Foundation item: Supported by the National Natural Science Foundation of China Biography: DENG Ai-jiao (1974-), female, Ph.D. candidate, research interes: is in stochastic process and random ractal     

Electrooxidation of Mn(Ⅱ) on Pb-Sb-As Electrode in Sulfuric Acid

The electrooxidation of Mn(Ⅱ) on Pb-Sb-As alloy electrode in sulfuric acid has been investigated.In order to make the two steps of indirect electrosynthesis of benzaldehyde carried out in the same sulfuric acid concentration and also obtain high current efficiency of Mn(Ⅱ) to Mn(Ⅲ) and high yield of Mn(Ⅲ) oxidizing toluene to benzaldehyde in the mean time,the electrooxidation of Mn(Ⅱ) in 60% H2SO4 has been studied.Experimental results show that high current efficiency of Mn(Ⅲ) (about 75%) is obtained in 60%H2SO4 at 60℃.The reason affecting the current efficiency of Mn(Ⅲ) is discussed,and it is the coordination of sulfuric acid concentration and electrolytic temperature.The law is found that it is suitable for electrolysis at low temperature when sulfuric acid concentration is low and at high temperature when sulfuric acid concentration is high.     

关于发展我国汽车工业的思考

分析了国外的经验并结合我国的经济现状，提出了应将汽车工业作为我国的支柱产业；国家应在资金、技术和人员等方面对汽车工业给予大力扶持，并在汽车进口方面对汽车工业实行适度保护并建议国家应引导汽车产业组建８个大的汽车集团企业，必要时可以采用一定的行政手段     

谈高等工科数学教学新系统

本文从系统论的观点出发，阐述分析了高等工科数学教学新系统的若干问题．     

拉萨市城市管理的特殊性与管理模式探究

拉萨市是西藏自治区的首府,是西藏政治、经济、文化的中心。文章通过对拉萨城市管理的特殊性探究,认为对于推动城市管理方式的变革,构建科学、有序、高效的城市管理体系,不断提升城市的综合效益,全面提高城市管理水平,具有重要的意义。     

A NEW APPROACH ON IDENTIFICATION OF BOUNDARY PARAMETER FOR A TWODIMENSIONAL DIFFUSION SYSTEM

This paper presents a new approach of the boundary parameter identification of adiffusion system.The system model is governed by a two-dimensional parabolic problem,which involves an unknown boundary parameter.Identifiability of the boundary parameterand the new approach are discussed briefly,which show that the new approach can overcomenot only the ill-posedness of the nonlinear output least square method but also the difficultyof numerical computation of the nonlinear output least square estimate due to the existenceof the local minima of the performance functional,Finally,some numerical examples aregiven.     

钛蓝宝石激光器泵浦光与振荡光模式匹配研究

本文运用ｑ参数的传输和交换规律，研究了钛蓝宝石激光器泵浦光和振荡光的模式匹配，结果表明在实用器件中采用单一透镜不能实现模式匹配，进而提出了一种新的模式匹配法，并给出了实用参数设计方式。     

对次类凸函数的两类择一定理

讨论了集合诸多凸性之间的关系 ,然后利用局部凸拓扑向量空间中的分离定理 ,对次类凸函数得到了两类新的择一定理 .这些结果是已知文献结果的实质性推广 .     

勒贝格定理的有趣证明与函数黎曼可积性

本文从振幅函数谈起,有趣的证明了勒贝格定理,然后通过典型例子充分说明了该定理是判定函数黎曼可积性的得力工具。     

工业计算机控制系统抗干扰对策

本文介绍工业计算机控制系统在现场运行中常见的干扰来源,提出减少和抑制干扰的几种措施。