中国地级市土地城镇化与人口城镇化协调发展的空间格局分析

在分析土地城镇化与人口城镇化协调发展机理的基础上,分别构建人口城镇化子系统与土地城镇化子系统的指标体系,综合运用熵权法和系统藕合协调度模型,以289个地级(以上)市为研究对象,测度地级(以上)市土地城镇化与人口城镇化协调发展度,并采用泰尔指数、探索性空间数据分析方法探讨其空间分异特征.主要研究结论:(1)土地城镇化与人口城镇化协调发展度的平均值为0.709,超过62%的地级市处于勉强协调级、濒临失调级和失调级,这表明我国土地城镇化与人口城镇化的协调发展度总体不高,提升空间很大.(2)城镇化协调发展度呈现由东部沿海地区向西北内陆地区递减的阶梯状分布态势,总体来说,东部地区(0.761)中部地区(0.717)西部地区(0.681).(3)土地城镇化与人口城镇化协调发展度呈现空间正相关,其空间集聚状态可以分为4种:高值集聚区(主要分布在东部沿海地区)、高值异质区域(零星分布在西南地区)、低值异质区域(主要集中分布在华北和中部地区)及低值集聚区(主要集中分布在陕甘地区、云川地区的部分地市).这个结论能够为区域之间城镇化协同发展政策的制定提供理论依据.     

区域旅游产业与城镇化建设耦合协调发展研究——以广西14个地级市为例

以广西14个地级市为研究对象,基于区域旅游产业与城镇化建设耦合协调发展作用机制,构建区域旅游产业与城镇化建设耦合协调发展评价指标体系,并运用熵权法、耦合协调度模型、面板聚类分析法对2010—2017年14个地级市旅游产业与城镇化建设耦合协调发展状况及空间差异进行测度与分析.结果表明,广西各地级市旅游产业与城镇化建设耦合协调发展水平变化特征基本稳定,大体呈上升趋势,但整体水平较低且空间差异明显.桂林市从濒临失调上升至初级协调,南宁市从濒临失调上升至勉强协调,柳州市、北海市、百色市、河池市从轻度失调上升至濒临失调,梧州市、防城港市、贵港市从中度失调上升至轻度失调,钦州市、玉林市、贺州市和崇左市从中度失调上升至濒临失调,来宾市从严重失调上升至轻度失调.可见,经济基础滞后和旅游产业发展基础滞后都将成为旅游产业与城镇化建设耦合协调发展的制约因素,提高广西各市旅游产业与城镇化建设耦合协调发展水平还需较长的发展周期.     

河南省人口-经济-土地-社会城镇化协调发展时空演变研究

基于人口、经济、土地和社会城镇化的概念和内涵构建评价指标体系,运用熵值法、协调发展度模型、秩相关系数、GIS可视化以及ESDA方法,研究了2000—2012年河南省人口-经济-土地-社会城镇化协调发展的时空格局演变.研究发现:1)2000—2012年13a间河南省人口-经济-土地-社会城镇化协调发展度呈稳步上升趋势,从失调阶段逐渐发展到过渡阶段,最后到达协调发展阶段;河南省18个地级市的协调发展度变化呈现一定的时序特征.2)18个地级市协调发展水平偏低,地区间协调发展度差距大,且有扩大趋势,空间分异明显.3)河南省城镇化系统协调发展存在着明显的空间关联性,但逐渐呈现空间弱化的态势,空间负相关增强.4)高值区主要位于豫西北部,低值区集中分布在豫东南塌陷区.     

四川省人口城镇化和土地城镇化协调发展研究

在全国推行新型城镇化的大背景下,以四川省为研究区域,选取14个评价指标,建立四川省人口城镇化与土地城镇化协调发展的评价指标体系,并运用熵值法确定各指标权重,构建协调发展度模型,定量分析四川省2003—2013年人口城镇化和土地城镇化协调发展状态,并预测其演变趋势。结果表明:(1)四川省人口与土地城镇化协调发展水平可分为失调阶段—过滤阶段—协调发展3个阶段;(2)总体上,人口城镇化和土地城镇化指数为上升趋势,两者的发展水平从轻度失调发展到优质协调发展。在城镇化建设过程中,必须兼顾人与地,实现人口与土地协调发展,走可持续发展的新型城镇化道路。     

河南省城镇化发展协调度研究

基于人口、经济、土地和社会城镇化概念与内涵构建城镇化发展协调度的评价指标体系,通过线性加权模型和离差系数法得到河南省18个市的2011年城镇化的发展水平得分和协调度,之后对评价结果的地区差异和协调度的空间差异进行分析,以期为城镇发展政策制定提供依据.研究结果表明:人口城镇化出现局部"低洼",经济城镇化和社会城镇化存在西北向东南倾斜的特征,土地城镇化在东北和中西部偏低;城镇化发展协调度总体较高,相互之间差距大,空间上存在由西北向东南倾斜的格局.最后基于18个市所属的协调度类型提出河南省城镇化协调发展的相应对策.     

四川省人口城镇化与土地城镇化协调发展时空演变研究

以四川省作为研究区域,建立人口城镇化与土地城镇化质量指标体系,采用变异系数法和耦合协调发展度模型对四川省及各地市2003—2014年人口城镇化与土地城镇化指数及二者的协调发展度进行测度,并结合空间分析方法对各地市的协调发展度进行了分析.结果表明:四川省的协调发展度同人口城镇化与土地城镇化呈阶段式增长,2014年总体上达到高度协调发展水平;各地市人口城镇化与土地城镇化整体上呈上升趋势并呈现出了不同的发展类型,其中人口城镇化发展呈现出了高速增长型、波动起伏型等4种类型,土地城镇化发展呈现出了高快高、高慢低等6种类型;在空间视角下四川省各地市的人口城镇化与土地城镇化协调发展度总体上呈上升趋势,各地市协调发展度平均水平由2003年的0.36增长至2014年的0.58,并且所有城市在2014年都已达到中等磨合协调发展及其以上水平;不同区域间的人口城镇化与土地城镇化协调发展度"区域同质化"带动作用显著且受地区社会经济发展状况影响较大;2007年为四川省各地市协调发展速度的分界点.     

安徽省城镇化水平与质量耦合协调的时空演变特征

以安徽省为研究区域,从人口发展、经济发展、社会发展、生态环境、城乡统筹发展及开放程度等6个维度构建城镇化质量评价指标体系,在定量测算安徽省16个地级市2005年、2010年、2014年的城镇化质量的基础上,借助协调度模型对安徽省各地级市城镇化水平与质量的协调状况进行实证分析.研究表明:2005—2014年安徽省城镇化质量呈小幅度上升趋势,增长幅度为16.79%,经济发展、社会发展对城镇化质量的拉动作用较大;各地级市城镇化水平与质量协调度处于上升态势,由低度失调向多层次协调发展转变,但协调度的整体水平较低,截至2014年仍然有一半的城市处于弱度协调状态;各地级市城镇化水平与质量协调度空间差异显著,具有聚集特征,呈现"两高两低"空间分布格局.研究结果表明今后应将提高人口质量、改善生态环境、缩小城乡发展差距、提高开放程度等作为促进安徽省城镇化水平与质量协调发展的重要途径.     

西藏自治区人口城镇化与基本公共服务协调发展研究

本文以西藏自治区73个区县为研究单元,运用熵权法、耦合协调度模型和空间自相关分析方法对人口城镇化系统、基本公共服务系统及两个系统的协调发展程度进行分析。结果表明：①人口城镇化水平随时间加速增长,空间格局呈现“中心区县高,东南高、西北低”；②基本公共服务水平加速趋势更加明显,阿里地区发展最迅速,各地级市中心区县发展最优；③整体发展水平落后,耦合协调度随时间明显升高,正向协调发展迈进。2000年与2015年格局相似,空间分异明显；④耦合协调度的空间正相关性愈发显著；局部空间自相关结果表明协调发展具有以拉萨和山南为核心的“核心-边缘”特征,热点区先向北扩张、后向南缩小,次热点区呈现“东北-西南”方向性,次冷点区范围缩小,集聚在昌都和林芝东部,冷点区数量增加,集中在藏西北高寒区域。     

长江经济带新型城镇化时空格局演变及影响因素研究

从经济、人口、社会发展、基础设施、城乡统筹和生态环境等6个方面建立新型城镇化发展水平的评价指标体系,运用熵值法、空间自相关分析法和灰色关联分析法等方法对长江经济带2003年、2009年和2014年110个地级及以上城市新型城镇化水平的时空格局及影响因素进行分析.结果表明：1)长江经济带市域间新型城镇化水平差异明显,西部差异大于中部大于东部;2)新型城镇化水平整体呈现出波动上升的态势,从东西方向上看,东部发展水平较稳定,中西部发展水平波动明显;3)新型城镇化中高、中等、中低和低水平区都呈现显著的空间集聚状态,但低水平区的连续分布状态有逐渐被“冲散”且面积减小的趋势;4)长江经济带新型城镇化水平五个类型区的影响因素各异,总体差异较显著.     

西江经济带城镇经济发展与交通建设耦合协调度研究——以来宾市为例

经济发展与交通建设是西江经济带上城镇融入发展的重要依托。该文运用基于耦合协调度的"经济与交通系统"评价模型,对西江经济带上的来宾市2011年的70个镇级行政区的经济发展与交通建设耦合协调情况进行评价和分析,并揭示其空间分异规律。结果表明:(1)来宾市经济与交通耦合协调的空间分异显著,耦合协调发展水平最高的城北街道办较最低的三江乡的协调发展度分值极差为0.8616;(2)协调等级整体上呈以交通枢纽为极点,县城优于镇域地区,区域内部各异的空间分异特征。     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.