全文获取类型
收费全文 | 313篇 |
免费 | 18篇 |
国内免费 | 24篇 |
专业分类
测绘学 | 37篇 |
大气科学 | 17篇 |
地球物理 | 39篇 |
地质学 | 48篇 |
海洋学 | 26篇 |
天文学 | 33篇 |
综合类 | 30篇 |
自然地理 | 125篇 |
出版年
2024年 | 1篇 |
2023年 | 3篇 |
2022年 | 20篇 |
2021年 | 13篇 |
2020年 | 19篇 |
2019年 | 19篇 |
2018年 | 13篇 |
2017年 | 14篇 |
2016年 | 12篇 |
2015年 | 14篇 |
2014年 | 15篇 |
2013年 | 18篇 |
2012年 | 10篇 |
2011年 | 18篇 |
2010年 | 15篇 |
2009年 | 14篇 |
2008年 | 11篇 |
2007年 | 13篇 |
2006年 | 22篇 |
2005年 | 21篇 |
2004年 | 11篇 |
2003年 | 9篇 |
2002年 | 6篇 |
2001年 | 3篇 |
2000年 | 9篇 |
1999年 | 6篇 |
1998年 | 5篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1993年 | 2篇 |
1992年 | 1篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1984年 | 2篇 |
排序方式: 共有355条查询结果,搜索用时 234 毫秒
61.
62.
中国区域经济差异形成的三次地理要素 总被引:12,自引:6,他引:6
关于地理要素对经济差异的影响,国际上已经做了大量研究。为了探讨地理要素对中国经济差异的影响程度,在Krugman的关于城市聚集的两大自然理论基础之上,提出了影响经济差异的三大地理要素,分别为自然地理环境要素、交通和区位要素以及人力资本和研发水平要素,并通过建模,从全国和三大地带的尺度上细致地分析了各地理要素对经济分异的影响。研究发现,在中国,自然地理环境对经济发展的作用得到了验证和充实,这为揭示地理环境作用提供了主要依据,扩展了国际上Sachs等人关于地理要素对经济发展的认识。目前我国经济正处于转型期,在各地理要素中,影响经济差异最大的为交通便利性指数,影响程度为0.374,因此交通基础建设投资应继续加大。 相似文献
63.
64.
探地雷达在水利设施现状及隐患探测中的应用 总被引:13,自引:0,他引:13
简述探地雷达的一些基本原理,介绍探地雷达用于水利工程设施现状及隐患探测的3个实例,包括拦洪闸底板现状探测;海滨防浪堤隐患探测以及江堤滑塌成因调查。 相似文献
65.
西安地热田医疗热矿水的产出状况分析 总被引:1,自引:0,他引:1
本文介绍了西安地热田概况及开采现状, 重点讨论了西安地热田医疗热矿水的产出状况 相似文献
66.
67.
68.
William B. Wood 《The Professional geographer》1988,40(3):266-279
Apart from the tragic certainty of death which accompanies AIDS everywhere, the means of its transmission, the spatial patterns of its diffusion, and the groups at highest risk of infection vary considerably among world regions. This paper reviews the disease and its transmission, then proposes three models of AIDS diffusion to assess the implications of the epidemic on various regions. AIDS North, of North America and western Europe, is urban based and primarily confined to homosexuals and IV drug abusers. AIDS South, in central Africa and the Caribbean, is spreading from cities into rural regions and affects primarily heterosexuals. The third, an AIDS North/South hybrid, is postulated as a model of diffusion of the disease in other Third World regions. The final section addresses the potential contribution of geographic research to policy-makers in attempting to cope with the diffusion of AIDS and in curbing the epidemic's advance. 相似文献
69.
《The Professional geographer》1986,38(1):105-130
Book Reviewed in this article: Unfairly Structured Cities . Blair Badcock Religion and Rural Revolt . Janos M. Bak and Gerhard Benecke The Industrial Geography of Canada . Anthony Blackbourn and Robert G. Putnam The Cuban-American Experience, Culture, Images, and Perspectives. Thomas D. Boswell and James R. Curtis Quaternary Paleoclimatology . R. S. Bradley Development and Crisis in Brazil, 1930–1983 . Luiz Bresser Pereiras Centres of Origin in Biogeography . John C. Briggs Analytical Urban Geography . Martin Cadwallader Geomorphology . Richard J. Chorley , Stanley A. Schumm, and David E. Sugden South Africa: The Impact of Past Geographies . A. J. Christopher The Geography of Underdevelopment. A Critical Survey . D. K. Forbes Health Care in Developing Countries . Wilbert M. Gesler Place to Grow Old: The Meaning of Environment in Old Age . Stephen M. Golant The Emerging Marine Economy of the Pacific . Chennat Gopalakrishnan An Introduction to Agricultural Geography . David B. Grigg The Soviet Union: A Geographical Study . G. Melvyn Howe Geographical Aspects of Health: Essays in Honour of Andrew Learmonth . N. D. Mc Glashan and J. R. Blunden Physical Geography: A Landscape Appreciation . Tom L. Mc Knight Mountain Experience. The Psychology and Sociology of Adventure. Richard G. Mitchell Jr . Systematic and Regional Biogeography. Stanley A. Morain The Economic Transformation of American Cities. T. J. Noyelle and T. M. Stanback , Jr . Normal Accidents: Living With High-Risk Technologies. Charles Perrow Vanishing Farmland: A Legal Solution for the States. Sarah E. Redfield Applied Methods of Regional Analysis: The Spatial Dimensions of Development Policy. Dennis A. Rondinelli Urbanization in Romania. A Geography of Social and Economic Change Since Independence. Per Ronnas Statistical Techniques in Geographical Analysis. Gareth Shaw and Dennis Wheeler The Granite Garden: Urban Nature and Human Design. Anne Whiston Spirn Political Geography: Recent Advances and Future Directions. Peter Taylor and John House Geographia y Medio Ambiente. Manuel Valenzuela -Rubío Nãgara and Commandery: Origins of the Southeast Asian Urban Traditions. Paul Wheatley The Common Fisheries Policy of the European Community. Mark Wise Geography and Gender. Women and Geography Study Group of the IBG Technological Hazards. D. J. Zeigler , J. H. Johnson , S. D. Brunn 相似文献
70.
An organizational model and border port hinterlands for the China-Europe Railway Express 总被引:3,自引:0,他引:3
Facilities connectivity is a priority area for implementing the Belt and Road Initiative (BRI). The “China-Europe Railway Express” (CER Express) mode of transport organization links China with Europe by fast-track cargo rail. A major instance of facilities connectivity related to this project is an important practical and symbolic instance of BRI transport cooperation. The strategic significance of the CER Express and a number of operational issues are outlined, as are the implications of limited market potential for costs and competitiveness. A “hub-and-spoke” organizational model that can generate scale economies and reduce costs is proposed. To examine the establishment of an organizational model of this kind, the economic hinterlands of Alashankou, Erenhot, and Manzhouli are identified under high-, mediumand low-cost scenarios using an analytical methodology that determines distance and economic costs, and a number of transport hubs (that include Harbin, Zhengzhou, and Lanzhou) are identified. The results found that the cost of the routes from 314 Chinese cities to Moscow is the lowest via Manzhouli in the high- and medium-cost scenarios, but the routes change via Erenhot in the low-cost scenario. A number of policy recommendations should follow up. 相似文献