基于文献引用关系和知识图谱的时空关系研究热点分析   总被引：1，自引：0，他引：1  

古杰  周素红  闫小培  柴彦威  郑重 《地理科学进展》2013,32(9):1332-1343

本文采用“Web of Science”数据库收录的1999-2013年期间发表的探讨时空关系相关文献,包括2263篇直接文献和这些文献引用的78139篇参考文献为基础数据,采用Histcite软件构建时空关系研究文献数据库,结合Citespace软件对该数据库进行文献引用关系和知识图谱的可视化处理,并对热点文献进行解读与分析,从而分析时空关系研究的研究热点和发展趋势。研究发现:2000年前后,时空关系研究与GIS结合逐步突破了传统时间地理学研究的技术瓶颈和研究框架,迅速进入了一个文献爆炸的阶段,研究的内容逐步从时空行为的描述转向对时空关系的解释。随着时空GIS技术的不断成熟,本领域的研究更多地把时空行为作为一种变量,对各种时空现象和社会问题进行解释,而不仅仅是一个被描述和解释的对象,其学科应用价值将逐步突显。  相似文献   

经济地理学视角下的物流活动研究进展及启示   总被引：2，自引：1，他引：1  

宗会明  周素红  闫小培 《地理科学进展》2010,29(8)

随着全球生产网络和现代物流研究的兴起,物流对于提升地区和企业的竞争力具有举足轻重的地位和作用.现阶段的物流研究主要集中于管理学和交通地理学2个学科.管理学侧重于研究物流组织和企业物流效率的提高,缺乏整体和空间的视角,而交通地理学则侧重于以货物流通为代表的传统物流研究,对于现代供应链及物流组织研究不够,二者各有研究优势和不足.经济地理学对物流活动的研究经历了传统物流活动研究、物流活动被遗忘、物流研究的被重新认识和发现3个阶段.在当今经济地理学"社会、制度、文化转向"背景下,经济地理学将在日益复杂的现代物流网络研究中发挥重要的作用,现代物流活动的相关研究,主要是由交通地理学者借鉴经济地理学理论对物流活动进行的研究.及经济地理学者对生产领域研究时对物流活动不经意的涉及,研究方向主要包括:全球生产网络下现代物流的性质和作用,现代物流组织结构研究,现代物流活动的空间表现及发展动力机制4个领域.总体而言尚处于研究起步阶段.最后,文章提出了对当代中国经济地理学对物流活动研究的几点启示.  相似文献   

国外非正规部门研究进展   总被引：2，自引：0，他引：2  

尹晓颖  闫小培  薛德升 《地理科学进展》2010,29(12)

国外非正规部门的研究始于20世纪70年代,最初研究的对象主要集中在发展中国家和地区,随着研究的深入,发现发达国家和地区也存在非正规部门,但存在方式和形成机制有别于发展中国家和地区.通过对国外非正规部门研究文献的系统梳理和分析,表明国外非正规部门的研究已形成一定的研究体系和理论成果,研究内容主要涉及非正规部门的边缘性和异质性等特征,非正规部门的空间集聚与分异,非正规部门存在与发展的理论,包括贫困就业论、二元经济论、规制论和嵌入论等,非正规部门与正规部门的联系,非正规部门的经济、社会影响以及非正规部门的正规化与政策等方面.但在从事非正规经济活动的人的空间特征、从综合视角分析非正规部门的形成发展过程、非正规部门对地域空间的影响以及对比研究和定量研究方面还较为欠缺.  相似文献   

转型期广州市金融服务业的空间格局变动   总被引：17，自引：1，他引：16  

林彰平  闫小培 《地理学报》2006,61(8):818-828

以广州市1984年第三产业普查数据和1996年、2001年基本单位普查数据为主要数据源,结合其他社会经济统计数据和实地调查资料,采用定性与定量相结合的对比、评估和解释方法,对转型期广州市金融服务业空间格局变动过程及原因进行了研究。结果显示：① 转型期广州市金融服务业向城市新区扩散和向城市中心区集聚并存,“集中于越秀”的初始空间格局变为“中心区多点集聚”的现状空间格局,金融服务业集聚地段的生成表现为一个“由南而北、由西往东”的时空运动过程。② 社会经济体制和金融管理体制转型、金融机构行为变化以及城市空间扩张分别是金融服务业空间格局变动的前提条件、微观基础和空间张力;城市化集聚经济效应促进各区金融服务业差异化增长,递次集中兴建的城市办公活动空间吸引金融机构在城市特定地段集聚。③ 研究时段内广州市金融服务业缺少西方国家城市那样的高端金融服务总部集聚中心,也没有观察到西方大都市CBD衰退现象和金融服务“废弃型”城市空间。  相似文献   

A further investigation of the decadal variation of ENSO characteristics with instability analysis     

孟祥凤  吴徳星  林霄沛  兰健 《大气科学进展》2006,23(1):156-164

Based on instability theory and some former studies, the Simple Ocean Data Assimilation （SODA） data are analyzed to further study the difference between the propagation of the ENSO-related oceanic anomaly in the off-equatorial North Pacific Ocean before and after 1976. The investigation shows that after 1976 in the off-equatorial North Pacific Ocean, there is a larger area where the necessary conditions for baroclinic and/or barotropic instability are satisfied, which may help oceanic anomaly signals propagating in the form of Rossby waves to absorb energy from the mean currents so that they can grow and intensify. The baroclinic energy conversion rate in the North Pacific after 1976 is much higher than before 1976, which indicates that the baroclinic instability has intensified since 1976. Prom another perspective, the instability analysis gives an explanation of the phenomena that the ENSO-related oceanic anomaly signal in the North Pacific has intensified since 1976.  相似文献   

Quantifying the non-conservative production of potential temperature over the past 22000 years     

ZHANG Cunjie  HAN Xueshuang  LIN Xiaopei 《海洋湖沼学报（英文）》2019,(2):410-422

The energy budgets of the ocean play a crucial role in the analysis of climate change. Potential temperature is traditionally used as a conservative quantity to express variations associated with “heat” in oceanography, such as the heat content and heat transport. However, potential temperature is usually not conserved during turbulent mixing, so the use of conservative temperature is more accurate. Based on climatological simulations under the modern and Last Glacial Maximum (LGM;~21 ka;ka=thousand years ago), as well as a transient climate simulation of the past 22 000 years, we quantify the errors induced by the neglect of the non-conservation of potential temperature in paleo-climate research for the first time. The temperature error reaches 0.9℃ near the coasts aff ected by river discharges but is much smaller in the open oceans, typically 0.03°C above the main thermocline and less than 0.01℃ elsewhere. The error of the ocean heat content (OHC) is roughly 3×10^22 J and is relatively steady over the past 22 000 years. However, the OHC increases to six times the original value during the last glacial termination from 20 ka to 7 ka. As a result, the relative OHC error decreases from 1.2% in the LGM climate to 0.14% in the modern climate. The error of the ocean meridional heat transport (OMHT) is generally smaller than 0.005 PW (1 PW=10 15 W), with very small temporal variations (typically 0.000 4 PW), and induces a relative OMHT error of typically 0.3% over the past 22 000 years. Therefore, the neglect of the non-conservation of potential temperature induces a relative error of generally less than 1% in the analyses of basin-scale climate variations.  相似文献   

Variability of surface velocity in the Kuroshio Current and adjacent waters derived from Argos drifter buoys and satellite altimeter data     

马超  吴德星  林霄沛 《中国海洋湖沼学报》2009,27(2):208-217

By combining Argos drifter buoys and TOPEX/POSEIDON altimeter data, the time series of sea-surface velocity fields in the Kuroshio Current (KC) and adjacent regions are established. And the variability of the KC from the Luzon Strait to the Tokara Strait is studied based on the velocity fields. The results show that the dominant variability period varies in different segments of the KC: The primary period near the Luzon Strait and to the east of Taiwan Island is the intra-seasonal time scale; the KC on the continental shelf of the ECS is the steadiest segment without obvious periodicity, while the Tokara Strait shows the period of seasonal variability. The diverse periods are caused by the Rossby waves propagating from the interior ocean, with adjustments in topography of island chain and local wind stress. Supported by the National Basic Research Program of China (973 Program, Nos. 2007CB411804, 2005CB422303), the NSFC (No. 40706006), the Key Project of International Science and Technology Cooperation Program of China (No. 2006DFB21250) and the “111 Project” (B07036), the Program for New Century Excellent Talents in University (NECT-07-0781)  相似文献   

Sea experiments of the Underway Conductivity-Temperature-Depth prototype made in China     

Xiangzhou Song  Hui Li  Xiaopei Lin  Xueen Chen  Xinshun Guo  Jiwei Tian 《中国海洋大学学报(英文版)》2009,8(4):409-415

  相似文献   

广州信息服务业增长的地域类型分析   总被引：6，自引：0，他引：6  

阎小培 《热带地理》1999,19(1):18-22

采用第三产业普查数据,用聚类方法,详尽分析了广州信息服务业增长的地域类型,揭示了在信息技术产业化和产业结构高度化的背景下,城市信息服务业的地域运动规律,并为合理布局和发展信息服务业提供理论基础  相似文献   

Relationship Between Producer Services Developing Level and Urban Hierarchy —— A Case Study of Zhujiang River Delta     

ZHONG Yun YAN Xiaopei 《中国地理科学(英文版)》2008,18(1):1-8

As the Central Place Theory indicates, the centricity of a central city can influence the extension of its service. Since the service industry in the theory is mostly consumer services, it is worth studying the relationship between the producer services and the centricity of the city in the service society with producer services becoming a more important part of the service industry. The paper takes the case of the Zhujiang （Pearl） River Delta （PRD）, a developed region in China, to study the relationship between the developing level of producer services and the urban hierarchy. Based on the analysis about the spatial difference of the producer services in the nine cities of the PRD, and the division of the nine cities according to some economic indices, it is shown that there is a correlation between the developing level of producer services and the urban hierarchy. Furthermore, two deductions about the future status of the producer services in the city and the location of the producer services in a large region can be made from this correlation between the developing level of producer services and the urban hierarchy.  相似文献