高校图书馆知识管理浅谈

知识管理是知识经济时代的一种全新的管理思想。阐述了高校图书馆在对自身实施知识管理时应注意的环节、存在的问题以及所要避免陷入的几个误区，并对未来的知识管理进行了展望。     

非线性系统的积分变结构间接自适应模糊控制

讨论了一类不确定非线性系统的间接自适应模糊控制问题 .基于变结构控制原理 ,并利用具有线性可调参数的模糊系统去逼近过程未知函数 ,提出一种具有监督控制器的积分变结构自适应模糊控制方法 .该方法通过监督控制器保证闭环系统所有信号有界 .进一步通过引入最优逼近误差的自适应补偿项来消除建模误差的影响 .理论分析证明了跟踪误差收敛到零 .仿真结果表明了该方法的有效性     

磁悬浮开关磁阻电动机径向力的动态解耦控制

基于基本电磁场理论 ,给出了磁悬浮开关磁阻电动机径向力与位置的模型 .针对模型具有非线性和强耦合的特点 ,对该模型进行可逆性分析 ,从而证明该系统可逆 .应用神经网络逆系统方法 ,设计其非线性控制器 ,将原来非线性强耦合的多变量系统解耦 ,转变成 2个位置彼此无耦合的线性子系统 ,应用线性系统理论容易对这 2个子系统进行控制 .仿真表明 ,系统具有良好的静动态性能 .     

自然科学领域著名期刊简介-Cell及其姊妹刊

Cell创刊于 1976年 ,现已成为世界自然科学研究领域最著名的期刊之一 ,并陆续发行了 8种姊妹刊 ,在各自专业领域里均占据着举足轻重的地位。Cell以发表具有重要意义的原创性科研报告为主 ,许多生命科学领域最重要的发现都发表在Cell上。本文旨在介绍该刊及其姊妹刊的办刊宗旨、征稿要求及评审程序 ,以使我国科学家能更加了解Cell系列期刊 ,提高投稿率和录用率 ,把出色的科研成果展示给世界 ;同时也能够通过阅读Cell系列期刊 ,把握世界最前沿的科学研究动向 ,加强我国与世界科学界的联系。     

Research Frontiers of Agricultural Economics and Management

The focus of research on Agricultural Economics and Management (AEM) has been switching from de-veloped countries to developing countries. In important international journals on AEM such as ““American Jour-nal of Agricultural Economics““ and ““Agricultural Eco-nomics““, the research objectives mainly focus on AEM problems in developing countries, e.g. the effects ofglobalization and liberalization on agricultural produc-tion in developing countries, and problems in agricul-tural resources and environmental protections in devel-oping countries.     

Fabrication and Properties of CoSm-Based Multilayer Thin Films

In recent years, SmCo series thin films have been found to be good candidates for fabricating integrated electromagnetic components and ultrahigh density magnetic recording media[1,2]. Up to now,intensive studies of such films have been carried out in order to obtain appropriate microstructure, crystallographic orientation and other properties. Substitution of Cu or Ni for Co in SmCo/Cr series films leads to a decrease of the saturation magnetization, magnetic switching volume, and to an increase of uniaxial anisotropy and coercivity[3-5].Various deposition conditions have also been investigated[6]. The large increase in coercivity for the annealed SmCo/Cr films is due to the growth of crystallitest[7,8]. In this article, we report a study of the deposition process,structure, and magnetic behavior of sputtered Sm (Co,Cu, Ti)/Cr series thin films.     

城市土地集约利用潜力评价--以南京市为例

从南京市城市土地利用的现状分析人手，总结了南京城市土地利用的基本特征及存在问题；分析了南京市主城区土地利用具有的内在潜力，并就此提出了相应的建议和措施．指出在城市化进程中，土地利用应走集约化发展的道路，挖掘土地潜力，盘活国有存量土地，提高土地利用率．     

Approaches to prediction of impact of Qinghai-Tibet Railway construction on alpine ecosystems alongside and its recovery

With the aid of the Remote Sensing (RS) and Geographic Information System (GIS) technology, the ecosystem pattern and fragility distribution maps of the 50-km-wide zone along the Qinghai-Tibet Railway were compiled and by using the superimposition method, range, area and indexes of the impact of various engineering activities on the ecosystems alongside the railway were studied. By making reference to the ecosystem recovery process of the Qinghai-Tibet Highway, mechanisms of recovery of the alpine ecosystems alongside the Qinghai-Tibet Railway were studied and extents and rates of the recovery were predicted.The results indicate that the impact of the railway engineering on the Alpine ecosystem depends mainly on how much the original surface soil in the zone has been disturbed and how fragile of the ecosystem per se. Restoration of vegetation coverage and species abundance shows a significantly reverse relationship with disturbance of the original surface soil but an extremely positive one with the length of the restoration period and mean annual precipitation and annual mean relative humidity in the period and no obvious bearings with altitude and temperature. In sections with an annual precipitation over 200mm, as long as a certain percentage of original soil is left in situ, it takes only 30 years or so for biodiversity to get basically restored to the original level after the construction is completed but at least 45-60 years or more for vegetation coverage.     

完美的对称伟大的突破--纪念爱因斯坦逝世五十周年

一代科学巨匠爱因斯坦,又是一位杰出的思想家,他的思想方法是耐人寻味的.他所创立的相对论,以其前提的简单、结构的新颖、体系的严谨、结论的正确,堪称现代物理理论之魁首.众所周知,相对论突破了经典力学的机械论囿限,否定了传统的绝对时空观念,披露了物质、运动、引力、时空的内在联系.相对论的建立,无疑是一个伟大的突破、一项卓越的创新.那么,爱因斯坦是如何突破和创新的呢?从方法论的角度,我们可从中吸取些怎么样的教益呢?     

函数极限与积分可交换的一个充分条件

研究了函数极限与积分可交换的问题，利用了平均一致收敛的定义，给出了一个比一致（R）可积性弱的充分条件。