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   425篇
  免费   37篇
  国内免费   63篇
测绘学   68篇
大气科学   38篇
地球物理   43篇
地质学   218篇
海洋学   35篇
天文学   2篇
综合类   63篇
自然地理   58篇
  2024年   1篇
  2023年   1篇
  2022年   2篇
  2021年   9篇
  2020年   5篇
  2019年   7篇
  2018年   9篇
  2017年   10篇
  2016年   5篇
  2015年   10篇
  2014年   26篇
  2013年   26篇
  2012年   25篇
  2011年   22篇
  2010年   32篇
  2009年   16篇
  2008年   39篇
  2007年   20篇
  2006年   29篇
  2005年   19篇
  2004年   10篇
  2003年   18篇
  2002年   19篇
  2001年   12篇
  2000年   14篇
  1999年   16篇
  1998年   15篇
  1997年   11篇
  1996年   9篇
  1995年   9篇
  1994年   10篇
  1993年   14篇
  1992年   7篇
  1991年   6篇
  1990年   4篇
  1989年   4篇
  1988年   7篇
  1986年   5篇
  1985年   4篇
  1984年   1篇
  1983年   1篇
  1982年   4篇
  1979年   1篇
  1976年   4篇
  1974年   1篇
  1973年   4篇
  1972年   1篇
  1971年   1篇
排序方式: 共有525条查询结果,搜索用时 17 毫秒
101.
BOOK REVIEWS     
Books reviewed in this article: The Mexican Colonial Copper Industry. Elinore M. Barrett . The Control Revolution: Technological and Economic Origins of the Information Society . James R. Beniger . Land Degradation and Society . Piers M. Blaikie And Harold C. Brookfield , Eds . La carte, mode d'emploi. Roger Brunet . France: les dynamiques du territoire . Roger Brunet AND Jacques Sallois , EDS. At the Crossroads—The Mineral Problems of the United States . Eugene N. Cameron . A Census of One Billion People , Papers for International Seminar on China's 1982 Population Census. Li Chengrui , ED. Les Milieux “Naturels” du Globe . Jean Demangeot . The Geophysiology of Amazonia: Vegetation and Climate Interactions : Robert E. Dickinson , ED. Tenn-Tom Country . James F. Doster And David C. Weaver . Family Farming in Europe and America . Boguslaw Galeski And Eugene Wilkening , EDS. The Geography of Urban Transportation . Susan Hanson , Ed. Combating Desertification in Developing Countries . J. K. Jain , ED. Cartography in France—1660–1848. Science, Engineering and Statecraft . Josef W. Konvitz . Distribution of Distances in Pregeographical Space . Hans Kuiper . Physical Geography Lab Manual: A New Experimental Approach . Neal G. Lineback And John M. Harlin . Physical Geography: A Landscape Appreciation , 2nd ed. Tom L. Mc Knight . The Desert Is No Lady: Southwestern Landscapes in Women's Writing and Art . Vera Norwood And Janice Monk , EDS. France: A Geographical, Social, and Economic Survey . Philippe Pinchemel , translated, by D. Elkins and T. H. Elkins. Gene Banks and the World's Food . Donald L. Plucknett , Nigel J. H. Smith , J. T. Williams , And N. Murthi Anishetty . Latin American Development: Geographical Perspectives . David Preston , Ed. Making Sense of Development: An Introduction to Classical and Contemporary Theories of Development and Their Application to Southeast Asia . P. W. Preston . The History of the Countryside. Oliver Rackham . The Third World in Perspective . H. A. Reitsma AND J. M. G. Kleinpenning . The Industrial Geography of Australia . David C. Rich . The Recruiting Game , 2nd Ed., revised. John F. Rooney , JR. A Cultural Geography of North American Indians . Thomas E. Ross AND Tyrel G. Moore , EDS. Eastern Europe . Dean S. Rugg . Human Territoriality: Its Theory and History . Cambridge Studies in Historical Geography: 7. Robert David Sack . Experimental Fluvial Geomorphology . Stanley A. Schumm , M. Paul Mosley , AND William E. Weaver . The New Urban Landscape . David Schuyler . Atlas of American Women . Barbara Gimla Shortridge . Impacts of Hazardous Technology: The Psycho-Social Effects of Restarting TMI-1 . John Sorensen , Jon Soderstrom , Emily Copenhaver , Sam Carnes AND Robert Bolin . Modern Physical Geography , 3rd Ed., (Third Edition). Arthur N. Strahler AND Alan H. Strahler . India: Economic Resource Base and Contemporary Political Patterns . B. L. Sukhwal .  相似文献   
102.
Basic concepts of cultural historical geography have been applied to a variety of community issues in St. Paul, MN. Through the process a sense of place has been developed at several scales. This inclusive sense of place has provided a link among various factions and made possible several compromises in land use and economic development issues. Most of the work was done through undergraduate field seminars.  相似文献   
103.
Geochemical Mapping—Evolution of Its Aims, Ideas and Technology   总被引:1,自引:1,他引:0  
The development of geochemical mapping progressed from local geochemical prospecting through regional geochemical exploration and regional geochemical mapping to national and global geochemical mapping. This paper discusses the evolution of aims, ideas and methodology of geochemical mapping in Western countries, Russia and China. The sophistication of geochemical mapping methodology will make great contributions to solving resources and environmental problems in the 21^st century.  相似文献   
104.
Geochemical Mapping——Evolution of Its Aims, Ideas and Technology   总被引:1,自引:1,他引:0  
The development of geochemical mapping progressed from local geochemical prospecting through regional geochemical exploration and regional geochemical mapping to national and global geochemical mapping. This paper discusses the evolution of aims, ideas and methodology of geochemical mapping in Western countries, Russia and China. The sophistication of geochemical mapping methodology will make great contributions to solving resources and environmental problems in the 21st century.  相似文献   
105.
实践教学是应用型人才培养的重要环节和关键因素。在交通行业背景下,文中针对华东交通大学测绘工程专业特点,以培养测绘工程专业实践能力强、创新务实的高素质应用型人才为目标,在深入研究该专业实践教学规律的基础上,构建集实践技能培养和创新能力培养于一体的测绘工程专业实践教学体系,并通过实践验证该体系的合理性和有效性。  相似文献   
106.
This paper examines the scope and limitations of geomorphological investigation of the sites of architectural and engineering works. Various degrees of vulnerability, forms of impact, and types of applied geomorphological response are summarized. Aspects of land development and construction practice that may increase the vulnerability of buildings and structures to geomorphological hazards are discussed. Strengths and weaknesses of the geomorphological input to hazard mitigation are reviewed. Examples are described that show both negative and positive influences exerted by geomorphological site analysis on urban and regional planning for unstable terrains in Italy. It is concluded that societal choice, within the overall matrix of a society's culture (sensu largo), will influence the way in which vulnerability is managed at sites, and hence the scope for utilizing geomorphological analysis of the physical risks.  相似文献   
107.
本文主要介绍各学科实用化攻关与综合预报以及专家系统等软件组成的统一软件系统,使该软件系统与在 IBM 机和 VAX 机上建立的数据库联接起来,并介绍了该系统的主要功能。  相似文献   
108.
109.
高仁强  张晓盼  熊艳  吴水平  晏磊 《测绘科学》2016,41(10):142-148
针对目前大多数基于位置指纹的WiFi定位算法都是以统计数学理论为依托,而且很少涉足定位精度在空间分布上的研究这一问题,该文在总结K近邻、加权K近邻以及最大似然模型的WiFi室内定位基础上,提出了一种结合模糊数学理论的WiFi定位算法。从平均误差、最小误差、最大误差、变异程度、定位时间这几个角度,将该算法与其他传统算法进行比较分析。基于真实场地的实验测试结果表明,该算法定位精度高,定位速度快。最后对定位误差进行空间插值分析,结果表明4种模型的定位精度均与WiFi信号源的分布位置有很强的相关性。  相似文献   
110.
在我国,由于特殊的地理位置和气候条件使得局部地区获取数据较为困难,导致在地理国情监测中利用传统光学成像监测手段获取数据难以满足监测需求。随着无人机机载微型化合成孔径雷达高分辨率对地观测成像技术的不断发展,使得全天时、全天候航空遥感监测成为可能。本文通过对无人机机载合成孔径雷达监测系统集成构建,利用该套系统高分辨率微波成像,验证了其在地理国情监测应用中的适用性。为无人机机载SAR技术在地理国情监测中的应用提供了新的解决手段。  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