A CASE STUDY ON CONCENTRATION AND DECENTRALIZATION：BEHAVIOR AND DYNAMIC MECHANISM OF SPATIAL EVOLUTION IN METROPOLITAN AREA，NANJING，CHINA

In rapid socio-economic development,the process of concentration and dispersal of various elements tends to be more dramatic,tremendously influencing the shaping and transformation of the space in metropolitan area.Survey of spatial concentration and decentralization has thus become a basic method in examining metropolitan spatial evolution.In this research,three elements were selected as the essential indicators of the process:demographic density distribu-tion,employment density distribution and business office location.Performance of these elements in Nanjing City was exam-ined historically.As Nanjing City could be regarded as a representative of metropolitan areas in China,its situation large-ly suggestes the general characteristics in similar areas of China.Hence based on the investigation of Nanjing City,four general implications were highlighted.First ,metropolitan areas in China are in a violent process and shift of spatial concentra-tion and decentralization.Second,from now to at least the near future,concentration will continue to be the central fea-ture.Third,the landscape of metropolitan areas basically exhibits a dual structure character.The gap in environmental and ecological qualities among different districts will continue for a long time.Fourth,Central Business District (CBD) is playing an important role in helping to convert the traditionally single-centered city structure into a polycentric one.     

Influence of the Choice of Core-Envelope Transition Point on the Binary Merger of Two Main-sequence Components

We have studied the influence of different choices of core-envelope transition point on the final merger of contact binaries with two main-sequence components. A binary of 1.00 + 0.90M⊙ with an initial orbital period of 0.35d is examined. The mass fraction of the primary mixed with the matter of the secondary, qmix, determined by the chosen core-envelope transition point, ranges from 0.04 to 1.00 in our analysis. If as qmix< 0.8, none of the     

四个PG类星体的谱能结构与红外辐射机制

本文利用宽波段能谱结构讨论了四个PG类星体的红外辐射机制．结果表明，在产生红外连续辐射的可能机制中，非热的、具有幂律特征的辐射和被核光度加热的“核尘埃”的热再辐射是红外辐射的主要来源．对于高光度的活动星系核，它的主星系的红外辐射及恒星形成区的红外辐射是可以忽略的．     

三级监察网络——煤矿违法开采的“克星”

面对超层越界、无证采矿和以采代探等违法采矿行为屡禁不止这一“顽疾”，禹州市国土资源局主动探索，推陈出新，走出了一条行之有效的执法监察新路子，即实行局各资源所(站)、测绘大队和执法大队三级监察网络，避免了违法行为排查的被动性、巡查的盲目性、查处的滞后性，做到了有计划、有重点、早发现、早制止、早处理，将一大批矿业违法活动消灭在萌芽状态，煤矿违法开采活动数量明显减少。     

Mobile Agent系统结构及其关键技术

Mobile Agent技术是一门新兴的技术,具有移动性、智能性和异步计算的特点,已成为计算机网络和分布式系统最具活力的发展方向.现对Mobile Agent的概念、系统结构及其关键技术进行了分析和探讨.     

西南矿区山体崩塌成因机制分析及防治对策

西南地区的矿区具有相似的地理、地质环境,通过四川芙蓉煤矿白岩崩塌的典型实例,对西南矿区山体崩塌的成灾环境进行调查研究,揭示了西南矿区山体崩塌的成因机制,并简要提出了对该煤矿开发与综合治理建议,指出了加强防治工作的紧迫性,强调开展系统工程防灾的重要性,并为该煤矿解决正常采掘接替及工作面的布置问题作出了科学的指导.     

地壳对海洋潮汐的响应

应用三维动态有限元方法研究了中国北部地区的地壳对邻近的渤海与黄海海平面变化的响应。虽然此应力场过于微弱不足以引发地震，但发现应力集中的位置及应力场变化较大的位置恰好与某些现代地震的震中一致。这一结果表明研究地壳对广泛分布的载荷的响应对研究区域地震构造是有帮助的。     

鹤壁市土地储备机制效益分析

自2004年4月,鹤壁市建立土地储备制度,经过三年多的运作和不断完善,初步形成了一套符合鹤壁市实际的土地收购、储备、供应机制,为促进城市建设和经济发展发挥了积极的作用. 一、鹤壁市土地储备机制的运行方式     

BRINGING FORWARD OF THE CONCEPT OF COGIS AND ITS ARCHITECUTRE RESEARCH

Based on the analysis of the development of GIS technology and application,this paper brought forward the concept of GoGIS,namely Cooperative GIS ,CoGIS is GIS facing group-users and supporting human-human interaction,which makes it differ from the former GISs,Then,the characteristics of general Computer Spport Cooperative Work (CSCW)applications and the complexity of Geographic Information Science were analyzed,and the conclusion the CoGIS was not a simple GIS layer on CSCW was reached,Further,this paper gaver the hierarchical architecture of CoGIS,and analyzed the coperative platform in detail from the following:1)basic elements;2) collaboration patterns;3) cooperation control mechanism;4) synchronization mechanism;5) security and 6) group communication and so on.With those,the problems about GIS applications are discussed,such as 1)distributed multi-source GIS information and knowledge sharing platform;2)the fusion and visualization of GIS information;3)virtual reality cooperative modeling;4) dymamic simulation;5)expert system and 6) decision-making.Finally,this paper analyzed CoGIS application mode in brief.     

完善机制保障农民合法权益

近几年来。嘉兴市在推进城市化进程中，土地征用的面积较大。从1993年至今。嘉兴市区城市规划内累计征地6．5万余亩。涉及失地农民4．86万人。如何妥善处理好土地征用与土地承包之间的关系，保护被征地农民的利益。解决好被征地农民的社会保障问题。是摆在各级政府面前的一道课题。市区从1993年起。开始探索“土地换保障”的征地新机制。使失去土地的农民得到了长期的基本生活保障。城市化得到稳步推进，达到了经济发展和社会稳定的双重目标。