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   499篇
  免费   21篇
  2021年   5篇
  2020年   11篇
  2019年   16篇
  2018年   19篇
  2017年   16篇
  2016年   21篇
  2015年   14篇
  2014年   11篇
  2013年   159篇
  2012年   15篇
  2011年   12篇
  2010年   15篇
  2009年   11篇
  2008年   7篇
  2007年   11篇
  2006年   6篇
  2005年   5篇
  2004年   8篇
  2003年   4篇
  2002年   11篇
  2001年   8篇
  2000年   3篇
  1999年   13篇
  1998年   5篇
  1997年   7篇
  1996年   4篇
  1994年   5篇
  1993年   3篇
  1992年   6篇
  1991年   4篇
  1990年   5篇
  1989年   3篇
  1988年   4篇
  1986年   2篇
  1984年   2篇
  1983年   8篇
  1982年   3篇
  1981年   2篇
  1980年   2篇
  1979年   5篇
  1978年   4篇
  1976年   5篇
  1975年   3篇
  1974年   3篇
  1973年   4篇
  1971年   2篇
  1970年   2篇
  1969年   4篇
  1968年   4篇
  1967年   3篇
排序方式: 共有520条查询结果,搜索用时 46 毫秒
61.
62.
EUROPE

France; A Geographical Survey. By P. Pinchemel, translated by C. Trollope and A. J. Hunt. 454 pp. Illustrations, Tables, Bibliography. Bell, London, 1969. 100s.

Italy. By George Kish. 8 × 5 1/4. 125 pp. 12 figures and index. Van Nostrand, New York, 1969. $1.lb95.

AFRICA

A Historical Geography of Ghana. By Kwamima B. Dickson. 15#lb5 × 23.lb5 cms. xiv + 379 pp., 58 maps and diagrams, 7 tables, appendices, bibliography, index. Cambridge U.P., London, 1969. 150s.

The Soil Resources of Tropical Africa. Edited by R. P. Moss. 8 1/2 × 5 1/2. Cambridge University Press, 1968. £2.

ASIA

Afghanistan. By Ludolph Fischer. Geomedical Monograph Series No. 2, 12 × 8 1/2. Text (German and English), 16 plates and 10 maps. Springer‐Verlag, Berlin, Heidelberg and New York, 1968. DM48, $12.lb00.

GEOLOGY AND GEOMORPHOLOGY

Readings in the Earth Sciences, Vols. 1 and 2. 11 1/4 × 8 1/2 Published W. H. Freeman, San Francisco, 1969. 94s. each.

Fife and Angus Geology. By A. R. MacGregor. 266 pp. Blackwood, Edinburgh and London, 1968. 21s.

METEOROLOGY

Essentials of Meteorology. By D. H. McIntosh and A. S. Thorn. 8 1/2 × 5 1/2. xv + 239 pp., numerous illustrations, answers to problems. Taylor and Francis, London. 20s.

ECONOMIC GEOGRAPHY

Industrial Britain: The North West. By David M. Smith. 10 × 6 1/4, 271 pp., 36 figures, 31 plates, bibliography and statistical appendix. David and Charles, Newton Abbot, 1969. 95s.

Industrial Demand for Water: A study of South East England. By Judith Anne Rees. 8 1/2 × 5 1/2 L.S.E. Research Monographs 3, xiv + 194 pp., Weidenfeld and Nicolson, 1969, London. 65s.

CARTOGRAPHY AND MAPS

The Antonine Wall. Ordnance Survey 2 1/2 Inch Map. 1969. 11s.

Maps and Air Photographs. By G. C. Dickinson. 10 × 17 1/2. xiv + 286 pp. Edward Arnold, London, 1969. 45s.

Atlas Four. 10 1/2 × 8 1/2. 115pages, + index 60 pages. Collins/Longmans, 1969. 15s.

EDUCATIONAL

Learning Through the Environment. By Muriel F. S. Hopkins. 7 3/4 × 5 1/8. 151 pages, 26 figures. Longmans, London. 1969. 15s.

Investigating Geography. By J. Philip Dodd. 9 3/4 × 7 1/4. 214 pp., 192 figures. Heinemann, London, 1969. 15s.

The London Regional Geographies. Book 3: Asia. By Leonard Hadlow and Reginald Abbott. 8 1/2 × 5 1/2. 294 pp., 145 figs. U. of London Press, 1969. 18s.

A Geography of Manufacturing. By H. R. Jarrett. 8 3/4 × 5 3/4. xvii + 349 pp. 67 illustrations. Macdonald &; Evans, 1969, London. 35s.

The Mediterranean Lands. By J. Brannigan and H. R. Jarrett. The New Certificate Geography Series: Advanced Level. 9 × 5l. xiv + 620, 150 illustrations. Macdonald and Evans Ltd., 1969. 38s.  相似文献   
63.
The Scottish Executive has adopted a policy to combat Scotland's declining population by encouraging inward migration. Using a multi‐state population model this paper presents nine long‐term population scenarios for Scotland using three net international migration levels and three fertility paths. The results show inward migration can slow population decline but makes little difference to population ageing. Without a higher fertility rate Scotland's population will become demographically unsustainable. Our simulations show that a higher fertility rate substantially reduces the future ageing.  相似文献   
64.
During the late‐Midlandian (25–13 14C ka BP), the last Irish Ice Sheet was thicker in the Western Mourne Mountains than previously argued. Geomorphological and sedimento‐logical analysis shows that regional ice from the Irish Ice Sheet spilled over the mountains, reaching a major limit 5 km along Pigeon Rock Valley. These findings differ from the previous view that a local valley glacier occupied the valley during this period. The pattern of deglaciation was reconstructed using glacial and periglacial evidence. A complex topographic environment in the upper reaches of the valley suggests that regional ice stagnated as it wasted away. During the Nahanagan Stadial (Younger Dryas, ca. 11–10 ka 14C BP) an arcuate ridge was formed on the western flank of the valley. Calculations suggest that the Equilibrium Line Altitude, influenced by topographic conditions favourable for snow accumulation, was approximately between 1736 m and 1386 m lower during the Nahanagan Stadial than at present.  相似文献   
65.
66.
67.
68.
69.
70.
The aim of this article is to establish whether spatial variation exists in acute hospital utilization in Ireland and, if it does, to identify the microlevel factors influencing this variation. First, an alignment process is used to calibrate the acute inpatient attendance and nights spent in hospital variables produced by a spatial microsimulation model at both the national and the subnational levels. Comparing the results of the national and subnational alignment allows us to examine whether spatial variation exists. Second, after establishing that hospital utilization displays a significant spatial pattern, we use a nationally representative survey to determine which individual‐level factors significantly affect inpatient attendance and the number of nights spent in hospitals. Using the calibrated data from the aforementioned spatial microsimulation model, we examine whether the spatial patterns of those variables found to influence hospital utilization match the spatial pattern of actual hospital utilization rates at the small area, electoral division level. That is, are the individuals/areas with the highest demand for acute hospital services utilizing acute hospital services? Finally, the results of this research are discussed in relation to both the national and international literature. El objetivo de este artículo es determinar si existe variación espacial en la utilización aguda y urgente (acute) de hospitales en Irlanda, y de ser así, identificar los factores microeconómicos que influyen en esta variación. En primer lugar, se utiliza un proceso de alineación para calibrar las variables de concurrencia (asistencia) de pacientes hospitalizados con casos agudos y de noches de estancia en el hospital, producidas por un modelo microsimulación espacial, tanto para niveles nacionales como subnacionales. Comparar los resultados de alineación de los niveles nacionales y subnacionales nos permite examinar si existe variación espacial. En segundo lugar, después de establecer que la utilización de hospitales muestra un patrón espacial significativo, empleamos una encuesta (un censo) nacional representativa para determinar qué factores a nivel individual afectan significativamente la concurrencia de pacientes hospitalizados y el número de noches de estancia en los hospitales. Al usar los datos calibrados del ya mencionado modelo de microsimulación espacial, analizamos si los patrones espaciales de esas variables que influyen en la utilización de hospitales concuerdan con el patrón espacial de las tasas reales (existentes) de utilización hospitalaria al nivel de las áreas pequeñas de división electoral (DE). En otras palabras, ¿Son las/los individuos/áreas con la mayor demanda de casos agudos de servicios de hospitalización las/los que están utilizados los servicios de hospitalización aguda? Finalmente, los resultados de esta investigación se analizan (discuten) en relación a la literatura especializada nacional e internacional. 本文的研究目的在于通过建立模型以检验爱尔兰急症医院的利用是否存在空间分异。如果存在空间分异,则识别影响其空间分异的微观尺度的驱动因子。首先,在国家和地方两个尺度,通过空间微观模型对所要构建模型的求诊人数及他们花费的夜间数进行校正和调整,并通过对比国家与地方两个尺度的校准结果,来检验其是否存在空间分异。其次,通过建立的模型检验出急诊医院的利用具有显著的空间模式,利用一份具有全国代表性的调查以确定哪些个体层面因素显著影响着求诊人数与在医院花费的夜间数。利用上述空间微观模拟模型检测影响医院利用的那些变量的空间模式,与实际的医院利用率的空间模式在被划分的小区域尺度上是否匹配。也就是说,这些对急症医院服务具有最大需求的个体或区域是否真正实际在使用着这些服务。最后,将本文结果与国内和国际文献进行了相关探讨。.  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