Spatial Autocorrelation and Localization of Urban Development   总被引：1，自引：0，他引：1  

LIU Jisheng CHEN Yanguang 《中国地理科学(英文版)》2007,17(1):34-39

A nonlinear analysis of urban evolution is made by using of spatial autocorrelation theory. A first-order nonlinear autoregression model based on Clark’s negative exponential model is proposed to show urban population density. The new method and model are applied to Hangzhou City, China, as an example. The average distance of population activities, the auto-correlation coefficient of urban population density, and the auto-regressive function values all show trends of gradual increase from 1964 to 2000, but there always is a sharp first-order cutoff in the partial auto- correlations. These results indicate that urban development is a process of localization. The discovery of urban locality is significant to improve the cellular-automata-based urban simulation of modeling spatial complexity.  相似文献   

中资律师事务所全球扩展及其网络空间结构演变   总被引：2，自引：0，他引：2  

邹小华  薛德升李玮 《世界地理研究》2019,28(2):149-159

运用链锁网络模型，分析了1993-2015年间中资律师事务所全球布局的时空演化特征，及其全球网络的空间结构演变特征。研究发现：①中资律师事务所在西欧、北美和亚太三大区域重点布局的基础上，全球空间覆盖范围迅速扩展，全球布局同时考虑全球金融型中心城市和政治型中心城市等多种类型区位；②中资律师事务所的全球网络，在国内的北京、上海、广州、深圳和海外的香港、纽约、伦敦、迪拜等核心城市构成的骨干网络的基础上不断扩展，其网络的全球化程度也不断增强；③中资律师事务所的全球扩展对北美、西欧、非洲、中东以及东欧等区域城市的全球网络联系影响较大，对空间临近的亚太地区影响相对较小，这也与以往研究结论存在一定的差异。  相似文献   

1985年以来中国大陆沿海集装箱港口体系位序-规模分布及其网络联系   总被引：1，自引：0，他引：1  

郭建科  何瑶  王绍博  吴陆陆 《地理研究》2019,38(4):869-883

21世纪以来,中国大陆众多沿海城市纷纷转型为港口城市,港口区域化态势明显,港口发展呈现新的竞合关系。运用位序-规模法则与复杂网络模型,从规模结构、航运网络两方面刻画1985年以来中国大陆沿海集装箱港口体系的区域化特征。结果表明：① 港口体系日趋完善,位序-规模分布更加明显;发展演化呈低级均衡,明显集中化及相对分散化三个阶段,围绕世界级枢纽港形成区域集聚和群内扩散的空间格局。② 港口航运网络小世界特征得到强化,不同类型港口航线网络特性变化差异明显。枢纽港以广度上升深度下降、中转功能上升为主;大型港口变化较为复杂,超过一半的大型港口腹地引致特征明显,中转功能较弱;地方港呈现两极分化态势,大部分港口在航线网络深度、广度与辐射能力等多方面得到提升,少部分港口则明显萎缩。③ 以班轮航线为载体的物流网络推动港口区域化内在联系更加紧密,轴-辐特征得到强化,整个网络效率大为提升。从社会网络分析软件（UCINET）呈现的最强联系航线看,沿海集装箱航运网络已由局部网络转变为统一的双层轴-辐网络,全国性的港口网络联系水平大幅提升,区域航运网络与港口群存在空间错位而非一一对应。  相似文献   

京津冀城市用地形态的双分形特征及其演化   总被引：1，自引：1，他引：1  

赵静湉  陈彦光  李双成 《地理科学进展》2019,38(1):77-87

区域城乡一体化的标志之一是城镇体系结构的一体化,这个过程可以从标度的角度进行描述和评价。分形是标度分析的重要方法,地理空间无尺度分布特征的典型参数是分维。论文以京津冀城镇体系为例,利用遥感图像的解译数据和人口普查数据开展分形分析、位序-规模分布分析和异速标度分析,用以解释1995—2013年间京津冀城镇体系演化的过程。结果表明,京津冀城镇体系及其演化的特征有：①京津冀空间结构和位序-规模分布都表现为自仿射双分形结构;②京津冀区域的城市人口-城区面积异速标度退化为假线性关系;③随着城镇体系的演化,自仿射的双分形结构逐步向自相似分形结构演化。由此得出结论：其一,京津冀城镇体系存在结构性的不协调因素。其空间结构和等级结构具有二元化特征,但演化方向却呈现内在结构一体化的显著趋势。其二,大城市用地不够集约。城市边缘区的无序扩张导致土地利用铺张浪费。地方政府和规划专家可以有意识地利用城镇体系演化的这种特征和趋势制定管理措施和优化规划方案。  相似文献   

The UNFCCC as a negotiation forum: towards common but more differentiated responsibilities     

Jutta Brunnée  Charlotte Streck 《Climate Policy》2013,13(5):589-607

The principle of common but differentiated responsibilities and respective capabilities (CBDRC) captures the idea that it is the common responsibility of states to protect and restore the environment but that the levels and forms of states’ individual responsibilities may be differentiated according to their own national circumstances. This principle has shaped the evolution of the climate regime and has played an important role in promoting compromise and agreement. It is argued that some twenty years after the adoption of the United Nations Framework Convention on Climate Change (UNFCCC), the principle of CBDRC remains as relevant as ever. The practice of Parties under the regime and, most recently, the concerted efforts to shape and flesh out the meaning of the principle, underscore the central role that it plays. At the same time, the binary understanding of CBDRC in the Kyoto Protocol is being replaced with a more nuanced, multifaceted understanding. The evolving interpretation of CBDRC is considered, and its continued relevance as the nucleus of a global burden-sharing regime for addressing climate change is demonstrated.

Policy relevance

The development of a common understanding of the principle of CBDRC is essential for the burden sharing and responsibilities under a future climate agreement. The CBDRC principle captures the idea that it is the common responsibility of states to protect and restore the environment, but that the levels and forms of states’ individual responsibilities may be differentiated according to their own national circumstances. This article informs the international climate change negotiations by considering the development of the principle of CBDRC under the UNFCCC over time. It is concluded that, although there has been a significant shift in how the principle is understood, it remains crucial to the integrity and stability of the climate regime.  相似文献   

运用“一法三化”进行测绘质量项目管理     

穆志杰  刘文生  卢志华 《测绘与空间地理信息》2014,(7):220-221

由于测绘项目需要在野外工作,且具有工作流动性、单一性,资料保密性、特殊性等特点,使得测绘单位与其他工业、工厂、食品生产单位相比,管理更具复杂性。尤其是一些大型工程,如西部无人区测图、全国1∶50 000地形图数据库更新、青海东部黄河谷地百万亩土地开发整理、陕西秦岭1∶10 000无图区等测绘项目,施工过程中若有一点疏忽甚至微小的纰漏就会造成重大工程质量问题。近几年来,国内工程项目质量不合格现象频频发生,形势比较严峻。笔者结合测绘项目的特点提出运用"一法三化"进行测绘质量项目管理的管理理念。  相似文献   

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王乐洋  鲁铁定 《大地测量与地球动力学》2014,34(2):55-59

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自由主义法律思想与国际法批判法学     

张艾妮 《广东海洋大学学报》2014,(2):63-67

自由主义法律思想对国际法具有重要影响,但其内部存在的基本矛盾等缺陷受到了国际法批判法学的猛烈挑战。国际法批判法学的观点独到而深刻,为我们审视传统的国际法理论体系提供了崭新的视角,并为国际法中的中国立场提供了智力支持。  相似文献   

浅析防雷行政执法的现状及对策     

李霞  杨倩 《内蒙古气象》2014,(3):39-40

文章针对在防雷行政执法过程中存在的违法行为进行了全面地总结,同时列举了制约防雷执法顺利实施的若干问题。通过对存在的问题进行深入的分析,提出了解决的途径和对策。  相似文献   

A Numerical Verification of Self-Similar Multiplicative Theory for Small-Scale Atmospheric Turbulent Convection          下载免费PDF全文

SONG Zong-Peng  HU Fei  LIU Yu-Jue  CHENG Xue-Ling  LIU Lei  XU Jing-Jing 《大气和海洋科学快报》2014,(2):98-102

The self-similar multiplicative theory（SSM theory）, aims to interpret the scaling behavior of the temperature structure function. In the present paper, the author report results from a numerical simulation of atmospheric turbulent convection in order to verify this theory. The simulation was based on a shell model which was deduced from simplified atmospheric convection equations. The numerical results agreed well with the theory prediction of scaling law from the first order to the eighth order. They also showed that the prediction of this theory was better than that given by the Kolmogorov＇s theory in 1941, log-normal, and β model theories.  相似文献