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   2059篇
  免费   223篇
  国内免费   237篇
测绘学   74篇
大气科学   367篇
地球物理   232篇
地质学   504篇
海洋学   198篇
天文学   4篇
综合类   155篇
自然地理   985篇
  2024年   5篇
  2023年   17篇
  2022年   45篇
  2021年   72篇
  2020年   55篇
  2019年   59篇
  2018年   63篇
  2017年   83篇
  2016年   84篇
  2015年   73篇
  2014年   97篇
  2013年   89篇
  2012年   98篇
  2011年   103篇
  2010年   79篇
  2009年   100篇
  2008年   112篇
  2007年   130篇
  2006年   121篇
  2005年   109篇
  2004年   84篇
  2003年   87篇
  2002年   92篇
  2001年   103篇
  2000年   93篇
  1999年   88篇
  1998年   79篇
  1997年   57篇
  1996年   41篇
  1995年   44篇
  1994年   35篇
  1993年   25篇
  1992年   16篇
  1991年   14篇
  1990年   16篇
  1989年   13篇
  1988年   10篇
  1987年   6篇
  1986年   5篇
  1985年   4篇
  1984年   5篇
  1983年   2篇
  1982年   4篇
  1978年   1篇
  1954年   1篇
排序方式: 共有2519条查询结果,搜索用时 15 毫秒
231.
In order to facilitate sustainable development, a shift from mobility-based to accessibility-based planning has been suggested. However, if we rely on the modern conceptualisation of accessibility, such a shift would have limited results. As an alternative, this paper proposes a relational reading of accessibility, which questions the divide between mobility and place upon which the modern definition is based. It argues that the accessibility of a place is characterised by a specific coordination of presences and absences that depends as much on boundaries and exclusions as on mobility. If accessibility changes, so does the place. This interpretation makes accessibility a matter of priorities and provides a critical perspective on arguments for time–space compressions and progress. This is illustrated here using the example of a regional strategy for transit-oriented development in Sweden (Region Scania). For that case, the discourse on accessibility revealed simplified arguments for densification, progress and metropolitan ideals, contradicting the initial inclusive intentions of the strategy. Thus, there is a need to put accessibility in place so that a shift to accessibility-based planning facilitates a move towards social and environmental sustainability.  相似文献   
232.
Private sector actors are playing an increasingly significant role in the definition and governance of ‘sustainable’ agri-food practices. Yet, to date little attention has been paid by social scientists to how greenhouse gas (GHG) emissions are addressed as part of private agri-food governance arrangements. This paper examines how private actors within agri-food supply chains respond to emerging pressure for measures to reduce GHG emissions from agriculture. Drawing upon the Anglo-Foucauldian governmentality literature, we introduce the notion of the corporate carbon economy to conceptualise the practical techniques that enable private agri-food actors to make GHG emissions thinkable and governable in the context of existing market, regulatory, and supply chain pressures. Using a case study of the Australian dairy industry, we argue that private agri-food actors utilise a range of techniques that enable them to respond to existing government environmental regulations, balance current market pressures with future supply chain requirements, and demonstrate improved eco-efficiency along food supply chains. These techniques – which include environmental self-assessment instruments, tools for measuring GHG emissions, and sustainability reporting – have little direct relevance to the ‘international climate regime’ of carbon trading, and carbon markets more broadly, yet individually and in combination they are crucial in enacting an alternative regime of GHG governance. In concluding, we contend that the growing use of sustainability metrics by international food companies is likely to have the most powerful implications for GHG governance in the agri-food sector, with potentially far-reaching consequences for how future action on climate change is rendered thinkable and practicable.  相似文献   
233.
In Malaysia, second largest palm oil producer worldwide, logging companies, palm oil corporations, and even responsible citizens can now compensate their biodiversity impacts by purchasing Biodiversity Conservation Certificates in an emerging new biodiversity market: the Malua BioBank. Biodiversity markets are part of a wider trend of marketisation and neoliberalisation of biodiversity governance; introduced and promoted as (technical) win–win solutions to counter biodiversity loss and enable sustainable development. The existing neoliberalisation and nature literature has tended to analyse these processes as consequences of an inherent drive of capital to expand accumulation and submit ever more areas of nature to the neoliberal market logic.In contrast, I aim (a) to problematise the agency and the “work” behind marketisation of biodiversity, challenging the story of (corporate-driven) neoliberalisation as the realisation of an inherent market-logic (based on the a false conceptual state–market divide, often prevalent even in activist academic circles working on neoliberalisation of nature) and to see the state not only as regulator, but driving force behind, and part of “the market”; (b) to question the myth of neoliberalisation as state losing control to the market and to show how the state is using the biodiversity market as mode of governing; re-gaining control over its forests and its conservation policy; and (c) to demonstrate empirically the distinction between neoliberal ideology and practice, and to show that marketisation was based on pragmatic decisions, not ideology-driven political action. My analysis is based on 35 qualitative interviews with actors involved in the BioBank.  相似文献   
234.
区域水资源协调分析   总被引:1,自引:0,他引:1  
本文建立了区域水资源协调分析的概念模型和通用多区域-多目标数学模型(MAOM),并结合新疆昌吉州的具体情况,运用目标规划法进行求解,确定了昌吉州近期和远景的水资源合理利用结构。  相似文献   
235.
20世纪70年代由于防洪、防凌的需要,黄河两侧修建了南、北展宽区,受防洪的限制,展宽区内群众的经济发展相对落后。小浪底水库建成运用后,南北展宽区失去其防洪作用,该文分析了南北展宽区内经济现状和资源的优劣势,针对如何利用现有条件就资源开发、优势互补等方面提出了设想和建议。  相似文献   
236.
关于网络经济的经济增长特征问题的讨论   总被引:5,自引:0,他引:5  
同传统的大工业经济相比较,网络经济条件下的经济增长特征问题有了新的内容。这就是,影响经济增长的主要因素有质的变化;经济资源得以在全球范围内优化配置;人力资源开发在经济增长中具有决定性作用;集约化成为经济增长的主要方式;信息技术成为经济增长的主要推动力。  相似文献   
237.
Analysis of the location of the fastest growing private companies in the United States suggests that a new corporate landscape is emerging. During the 1980s this corporate landscape has increasingly been dominated by companies in the service sector rather than in manufacturing. Sunbelt metropolises, especially in California, are more favored locations for the fast-growth firms than for the traditional Fortune 500 industrial and 500 service corporations. The fast-growth firms are also more likely to locate in suburban areas than the traditional corporations. These service, Sunbelt, and suburban characteristics of the new corporate landscape are interpreted as a consequence of the restructuring of the US economy.  相似文献   
238.
改革开放以来,我国国土综合开发整治研究蓬勃发展。本文从国土综合开发整治的特点取得的重大进展,展望未来的发展方向。逐步形成具有中国特色的区域综合开发的理论体系,是地理工作者和其他国土工作者的任务。  相似文献   
239.
BOOK REVIEWS     
Books reviewed in this article: Aerial Photography and Remote Sensing Aerial photography and image interpretation for Resource Management . DAVID P. PAINE . Analytical Models and Techniques Spatial Processes Models and Applications A. D. CLIFF AND J. K. ORD Quantitative and Statistical Approaches to Geography: A Practical Manual JOHN A. MATTHEWS . Cartography and Maps Map Data Processing . HERBERT FREEMAN AND GOFFREDO G. PIERONI , eds. Computer-assisted Cartography: Principles and Prospects, 1982 . MARK S. MONMONIER . Cultural Navajo Architecture: Forms, History, Distributions . STEPHEN C. JETT AND VIRGINIA E . SPENCER . Rational Landscapes and Humanistic Geography . EDWARD RELPH . Economic The Structure and Control of a State Economy . W. L. L'ESPERANCE . Economic Geography . JAMES O. WHEELER AND PETER O. MULLER . The Myth of the Family Farm: Agribusiness Dominance of U.S. Agriculture . INGOLF VOCELER . Libya: The Experience of Oil . J. A. ALLEN . Geography of Public Finance, Welfare Under Fiscal Federalism and local Government Finance . ROBERT BENNETT . Environmental Management, Resources, and Systems Mountains and Man . LARRY W. PRICE . Environmental Geology . DONALD R. COATES . An Introduction to Environmental Systems . G. H. DURY . The Environment: Chinese and American Views . Edited by LAURENCE J. C. MA AND ALLEN G. NOBLE . Land Use in America . RICHARD H. JACKSON . Medical Conceptual and Methodological Issues in Medical Geography . MELINDA S. MEADE (ed.). Philosophy and Geographic Thought Birds in Egg/Eggs in Bird . GUNNAR OLSSON . PhysicaI Climatology: Selected Applications . J. E. OLIVER . Geomorphological Techniques . ANDREW GOUDIE (ed.). Political Politics, Geography and Behaviour . RICHARD MUIR AND RONAN PADDISON . The State of the World Atlas . MICHAEL KIDRON AND RONALD SECAL . Population The Population of the South . DUDLEY L. POSTON , JR . AND ROBERT H. WELLER , eds. Regional Latin America: Economic Development and Regional Differentiation . ARTHUR MORRIS . Developing the Amazon . EMILIO F. MORAN . Western Europe: A Systematic Human Geography . BRIAN W. ILBERY . Settlement Systems in Sparsely Settled Regions: The United States and Australia . RICHARD E. LONSDALEAND JOHN H. HOLMES , eds. African Perspectives: The Economic Geography of Nine African States . HARM DE BUJ AND ESMOND MARTIN , eds. Rural Nonmetropolitan America in Transition . AMOS H. HAWLEY AND SARA MILLS MAZIE , eds. Social Crime and Environment . R. NORMAN DAVIDSON . The Ghetto: Readings with Interpretations . JOE T. DARDEN , ed. Urban Urban Problems and Planning in the Developed World . MICHAEL PACIONE (ed.) Problems and Planning in Third World Cities . Edited by MICHAEL PACIONE . The City in West Europe . D. BURTENSHAW , M. BATEMAN , AND C. J. ASHWORTH .  相似文献   
240.
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