首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   2062篇
  免费   127篇
  国内免费   84篇
测绘学   500篇
大气科学   86篇
地球物理   82篇
地质学   414篇
海洋学   198篇
天文学   3篇
综合类   163篇
自然地理   827篇
  2024年   6篇
  2023年   22篇
  2022年   71篇
  2021年   80篇
  2020年   58篇
  2019年   95篇
  2018年   44篇
  2017年   108篇
  2016年   101篇
  2015年   89篇
  2014年   119篇
  2013年   170篇
  2012年   121篇
  2011年   107篇
  2010年   93篇
  2009年   78篇
  2008年   118篇
  2007年   102篇
  2006年   99篇
  2005年   87篇
  2004年   63篇
  2003年   61篇
  2002年   59篇
  2001年   48篇
  2000年   51篇
  1999年   42篇
  1998年   36篇
  1997年   23篇
  1996年   12篇
  1995年   11篇
  1994年   10篇
  1993年   16篇
  1992年   5篇
  1991年   10篇
  1990年   7篇
  1989年   5篇
  1988年   12篇
  1987年   6篇
  1986年   6篇
  1985年   7篇
  1984年   10篇
  1983年   1篇
  1982年   3篇
  1980年   1篇
排序方式: 共有2273条查询结果,搜索用时 0 毫秒
531.
将城市热岛效应分析融入GIS中应用于城市规划   总被引:4,自引:1,他引:4  
介绍了GIS在城市规划中的应用和热岛与城市规划的相互关系,并探讨能否将GIS与城市热环境相结合运用于城市规划设计中。根据某城镇的地表、气候、降雨量、风场等自然因素与人口、政治、经济、文化等人为因素相联系,综合分析设计出最优的生态城市规划方案,满足当代人高质量生活环境的要求,以及整个城市乃至全球的生态发展。  相似文献   
532.
国外旅游规划研究进展及主要思想方法   总被引:26,自引:1,他引:26  
文章回顾了国外旅游规划发展的历程和新的动向,并针对不同时期的技术进步程度把它划分为开始、过渡、快速发展、深入发展4个阶段。阐述了各个阶段的规划技术革新及对旅游规划的新认识。并对5种比较有影响的规划思想和方法进行了介绍。  相似文献   
533.
This article takes its point of departure in the assumption that values shape planning practices and that alternatively one can reconstruct such values from the way planning interventions are argued and evaluated. We contend that planners’ discourses involve implicit value commitments that are observable in their representations of public space and implicated in the results of public-space planning. The paper builds an empirical case from representations of public space elaborated in planning documents developed by planners in four medium-sized Nordic cities. We show how these planning representations form four thematic value clusters concerning urban public space, namely leisure-play, identity-unity, power-organization and unruliness-change. Together these clusters constitute a value framework which reveals a number of central tensions relating to the way that planners seek to balance order and spontaneity in public space. The paper concludes by outlining and discussing these values and the tensions they represent.  相似文献   
534.
Considering the urban characteristics, a customized multi-scale numerical modeling system is established to simulate the urban meteorological environment.THE system mainly involves three spatial scales;the urban scale, urban sub-domain scale, and single to few buildings scale. In it, different underlying surface types are employed, the building drag factor is used to replace its roughness in the influence on the urban wind field, the effects of building distribution, azimuth and screening of shortwave radiation are added, and the influence of anthropogenic heating is also taken into account. All the numerical tests indicate that the simulated results are reasonably in agreement with the observational data, so the system can be used to simulate the urban meteorological environment. Making use of it, the characteristics of the meteorological environment from the urban to urban sub-domain scales, even the among-buildings scale,can be recognized. As long as the urban planning scheme is given, the corresponding simulated results can be obtained so as to meet the need of optimizing urban planning.  相似文献   
535.
我国土地研究领域知名学者,原中国土地勘测规划院(现中国国土勘测规划院)院长、党委书记,曾担任中国土地学会副理事长的黄小虎研究员,应邀于2020年11月21日在清华大学土地利用与住房政策研究中心主办的“后疫情时代:国土空间规划与城乡高质量发展”论坛上作主题报告。他在发言中指出:传统规划体系存在多类型规划矛盾冲突的问题,多规合一为解决这一问题指明了方向、奠定了基础。十八大以后,中央对经济社会的发展战略、路线方针等陆续做出重大调整,国家发展内涵发生转变,要求突出发展质量,强调环境保护、农业农村优先。在体制机制上明确由新组建的自然资源部负责建立空间规划体系,其他部门不再编制涉及空间布局的规划,“多规合一”得到实现。国土空间规划的核心内容是国土利用和土地利用的功能分区,这也是用途管制的依据。  相似文献   
536.
Heritage is the contemporary usage of a past and is consciously shaped from history, its survivals and memories, in response to current needs for it. If these needs and consequent roles of heritage, whether for the political legitimacy of governments, for social and ethnic cohesion, for individual identification with places and groups, or for the provision of economic resources in heritage industries change rapidly, then clearly we expect the content and management of that heritage to do likewise. The cities of Central Europe have long been the heritage showcases that reflected the complex historical and geographical patterns of the region's changing governments and ideologies. The abrupt economic and political transition and reorientation of the countries of Central Europe has thus, unsurprisingly, led to many equally abrupt changes in the content and management of urban heritage throughout the region. The uses made of heritage are clearly drastically changing but so also is the way that heritage is currently managed. What is happening, as well as how, is however uncertain and investigated here. The revolutionary eradication of a rejected past, a return to some previous pasts or the beginnings of a new past in the service of a new present are all possibilities. Answers are sought to these questions through the examination of a selection of cases of types of heritage city and their management in the region. These include an archetypical European gem city (Eger, Hungary), a tourist-historic honey-pot (?esky Krumlov, Czechia), a medium-sized multifunctional city (Gdansk, Poland), a major metropolis (Budapest, Hungary), the relict anomaly (Kaliningrad/ Königsberg, Russia) and the national cultural centre of Weimar.  相似文献   
537.
P. Agrawal 《GeoJournal》1999,49(3):311-322
Many Asian mega-cities are growing rapidly and they face formidable urban problems: unplanned squatter settlements, inadequate infrastructure and basic amenities. Smaller Asian urban areas also need badly the provision of basic infrastructure and facilities. However, efforts to improve are often constrained by either nonavailability of suitable land or its exorbitant cost. Strategies such as land consolidation have shown considerable promise. Implementation of the strategy varies from country to country and from project to project. In general, the land consolidation approach is participatory in nature and places emphasis on in situ development with voluntary contribution of private assets by affected households in need of infrastructure and basic services. However, to make any significant impact of the land consolidation strategy on urban development, financial support from multilateral agencies such as the World Bank is necessary. To enable this it is necessary that the policy and implementation procedures fully conform to the objectives of the World Bank's safeguard policies such as OD 4.30 `Involuntary Resettlement'. This study reviews the land consolidation policies and procedures as applied in several Asian countries in general, and in Indonesia in particular. The objective is to identify the gaps that exist between the policy and procedures and that of the objectives of the World Bank's Policy of Involuntary resettlement and to recommend general policy and procedural guidelines for land consolidation projects that would enable financial support from multilateral agencies such as the World Bank. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   
538.
湖南传统村镇感应空间规划研究   总被引:5,自引:3,他引:2  
刘沛林 《地理研究》1999,18(1):66-72
长期以来,国际规划界只注重村镇的功能规划,而忽视其感应空间的规划。根据感应与行为地理学的理论,一定的感应空间影响着一定空间中的人的行为。在自给自足的小农社会背景下形成的中国大批传统村镇,其感应空间仍然带有浓厚的封建、封闭、保守、内向等文化特点,远不能适应改革开放形势下市场经济的灵活、进取、外向等要求。文章以湖南省传统村镇为例,探讨了湖南张谷英村、德夯村等传统村镇感应空间的特点及其现代规划的原则和方法。  相似文献   
539.
区域持续农业的景观生态研究   总被引:9,自引:1,他引:8  
从提出背景,概念内涵,本质特性以及实践内容来看,持续农业具有鲜明的生态内涵,研究离不开生态学的指导;从系统主体,出发点、尺度、动态来看,区域持续农业在更大程度上属于景观生态学的研究范畴,因此 生态学可作为区域持续珠理论基础,而主观生态学应用方向的景观生态规划便可实现区域持续农业的空间途径,最后,文章以中国北方农牧过渡北山地的景观利用方向进行案例实践。  相似文献   
540.
试论广州高新区的发展与布局区位   总被引:3,自引:1,他引:2  
郑静 《热带地理》1999,19(1):1-10
讨论了广州高新区发展现状、性质、空间布局、管理体制以及目前国内外宏观环境等问题,指出由于其它城市高新区的挑战,改变了广州高新区发展的外部条件,使其面临极大的竞争压力;另一方面,由于政府扶持力度不够,资金投入不足,空间布局不利,本地科技力量薄弱,管理体制不畅等综合原因,导致广州高新区发展滞缓。文中在分析广州科技水平、基础设施条件、城市总体规划等因素的基础上,提出4点建议,以求尽快改善广州高新区发展的  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号