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   1623篇
  免费   68篇
  2023年   8篇
  2020年   15篇
  2019年   27篇
  2018年   33篇
  2017年   34篇
  2016年   48篇
  2015年   31篇
  2014年   40篇
  2013年   519篇
  2012年   66篇
  2011年   59篇
  2010年   56篇
  2009年   61篇
  2008年   33篇
  2007年   52篇
  2006年   57篇
  2005年   24篇
  2004年   30篇
  2003年   24篇
  2002年   21篇
  2001年   24篇
  2000年   20篇
  1999年   17篇
  1998年   17篇
  1997年   11篇
  1996年   13篇
  1995年   15篇
  1994年   14篇
  1993年   14篇
  1992年   9篇
  1989年   12篇
  1988年   13篇
  1987年   8篇
  1986年   11篇
  1985年   15篇
  1984年   9篇
  1983年   17篇
  1982年   12篇
  1981年   11篇
  1980年   16篇
  1979年   15篇
  1978年   9篇
  1977年   8篇
  1976年   10篇
  1974年   12篇
  1972年   8篇
  1971年   11篇
  1968年   13篇
  1967年   8篇
  1966年   7篇
排序方式: 共有1691条查询结果,搜索用时 15 毫秒
31.
32.
There is increasing concern about environmental impacts of acidic drainage from acid sulphate soils on Holocene estuarine flood plains. Acidity derives from oxidation of iron pyrite in the sediments. Natural factors determine concentrations and distributions of pyrite accumulations, but human activities have reduced pyrite accumulation in the Pearl River Delta with land use practices increasing terrestrial sediment discharge. Large freshwater discharges and management techniques have enabled sustainable use of these soils. High concentrations of pyrite occur in many estuarine flood plains of Australia because of relatively greater marine inputs. Drainage of these soils enhances pyrite oxidation and estuarine acidification, which is associated with fish-kills. For sustainable development, the problems of acid sulphate soil drainage must be recognised and overcome.  相似文献   
33.
34.
Book reviews     
THE MIND OF EAST ASIA, Lily Abegg. (338 pp. with Index). Translated from the German. Thames and Hudson; London, New York.

BRITAIN AND THE UNITED STATES: Problems in Co‐operation. A joint report prepared by Henry L. Roberts and Paul A. Wilson. London. Royal Institute of International Affairs. Pp. 224. Price 8/6 sterling. 1953.

D?R LAUTLOSE AUFSTAND. BERICHT VEBER DIE WIDER‐STANDSBEWEGUNG DES DEUTSCHEN VOLKES 1933–1945. Herausgegeben von Guenther Weissenborn. Rowohlt Verlag Hamburg. Pp. 348.

“EASTERN AND WESTERN WORLD”: Selected Readings with a foreword by S. Hofstra. Issued under the auspices of the Netherlands Foundation for International Co‐operation and published by W. Van Hoeve Ltd., The Hague, Bandung. 1953. Pp. 181.

NATIONALISM AND SOCIAL COMMUNICATION. By Karl W. Deutsch. John Wiley & Sons, N. Y. viii and 292.

BURMA UNDER THE JAPANESE: By Thakin Nu. Pictures and Portraits, Edited and translated with Introduction by J. S. Furnivall. Macmillan, London. 1954. Pp. xxviii and 132. Price 12s 6d.

COMMODITY TRADE AND ECONOMIC DEVELOPMENT—Report of a Committee appointed by the Secretary‐General, United Nations, Published by the United Nations, 1953.  相似文献   

35.
36.
The recent application by Burton and Krinsley (1987) of back-scattered electron (BSE) petrography to obsidians from sources located in the south-western United States established that this method can effectively resolve and characterize included micro-crystalline phases that have proven difficult to analyse by optical thin-section microscopy. In the first extension of their original study, we have examined, using BSE petrography, obsidians from island sources located in the Mediterranean, including sources known to have been exploited in prehistory. Because of the kinetic contrasts on their crystallization, these microcrystalline phases reflect the magmatic history of the obsidian, providing information about superheating, supercooling, sub-solidus processes, and other phenomena. This information is of significance for the chemical analysis of Mediterranean obsidians and also as the basis for a powerful alternative to existing non-destructive analytical methods for the sourcing of archaeological and art-historical obsidian.  相似文献   
37.
This paper describes the administration procedures of the European Regional Development Fund (ERDF) for Objective 2 in Catalonia. The paper shows also that the flow of an average of 100 million ECU per year from this Fund from 1989–1993, despite having a relatively slight impact on the Catalan GDP, has contributed to solving some of the bottlenecks in the Catalan economy.  相似文献   
38.
Strategic planning, as developed in the military and business sectors, offers a procedural model with important differences from the earlier comprehensive approach. Economic and physical development strategies, often called for by national planning legislation in European countries, frequently have little in common with the model proposed by Steiner for private firms, or espoused for the public sector by Bryson and others: there appears to be confusion resulting from use of similar terms. This paper investigates efforts to employ at least the major features of strategic planning in two institutionally and culturally different contexts, nearly half a world apart. In Bergen, Norway, these principles have informed economic development planning and planning for a major district of the city. In the case of Seattle, Washington, USA, the new comprehensive plan is based on framework policies developed during a 2‐year public process, and now that the city‐wide plan is adopted, Seattle is turning to developing neighbourhood plans which will provide more operational detail for guiding public and private investments. Comparison of these two cases both provides contrasts and similarities stemming from the two different contexts, and help to evaluate the transférability of strategic planning from the private to the public sector.  相似文献   
39.
Book reviews     
Adam Watson, Diplomacy: the dialogue between states. Eyre Methuen, London, 1982, pp.239. $28.95.

Desmond Ball and J.O. Langtry (eds). Civil Defence and Australia's Security in the Nuclear Age. Strategic and Defence Studies Centre, Australian National University, Canberra, and George Allen and Unwin Australia, Sydney. 1983, pp. 359. $12.95.

Bruce Grant, Gods and Politicians. Allen Lane, Ringwood, Victoria, 1982, pp.wi + 190. $16.95.

B.A. Santamaria, Santamaria, Against the Tide. Oxford University Press, Melbourne, 1981, pp. 382. $22.50

M.M. Kritz. C.B. Keely and S.M. Tomasi (eds.), Global Trends in Migration: Theory and Research on International Population Movements. The Centre for Migration Studies, New York, 1981, pp.xi + 433. $US14.95 (cloth), $US9.95 (paper).

Robert Cassen, Richard Jolly, John Sewell and Robert Wood (eds). Rich Country Interests and Third World Development. Croom Helm, London and Canberra, 1982, pp. 369. $27.75.

David Childs, The GDR: Moscow's German Ally. George Allen and Unwin, London, 1983, pp. xiii + 346. $49.95 (cloth), $19.95 (paper).

Alexander Shtromas, Political Change and Social Development; The Case of the Soviet Union. Verlag Peter Lang, Bern, 1981, pp 173. S Fr 40.

Joel K. Goldstein, The Modern American Vice Presidency. The Transformation of a Political Institution. Princeton University Press, Princeton, N.J., 1982, pp. xxii + 409. $US36.50 (cloth) $US 10.50 (paper).

Colin Mackerras, Modern China ‐ A Chronology from 1842 to the Present. Thames and Hudson, London, 1982, pp. 703. $60.00

John H. Fincher, Chinese Democracy: The Self Government Movement in Local. Provincial and National Politics, 1905–1914. Australian National University Press, Canberra, 1981, pp. 27s6. $23.95.

A.J. Youngson, Hong Kong: Economic Growth and Policy. Oxford University Press, Hong Kong, 1982, pp. 163. $10.95.

Peter Wesley‐Smith, Unequal Treaty 1898–1997: China. Great Britain and Hong Kong's New Territories. Oxford University Press, Hong Kong. 1980, pp. XV + 270. $39.00.

Michael Leifer, Indonesia's Foreign Policy. George Allen & Unwin, London, 1983, pp. xvii + 198. $39.95.

Grant Evans, The Yellow Rainmakers. New Left Books/Verso, London, 1983, pp. 202. $33.50 (cloth) $10.50 (paper).

Stewart Firth, New Guinea Under the Germans. Melbourne University Press, Melbourne, 1982, pp. xiii + 216. $25.00.

R.J. May (ed.), Micronationalist Movements in Papua New Guinea. Political and Social Change Monograph No. 1, Department of Political and Social Change, Research School of Pacific Studies, Australian National University, Canberra, 1982, pp. xi. + 486 $9.50.

Politics in Melanesia. Institute of Pacific Studies, University of the South Pacific, Suva, 1982, pp. xxi + 170. $4.00

Foreign Forces in Pacific Politics. Institute of Pacific Studies, University of the South Pacific, Suva, 1983, pp. xv + 325, $6.00.

Mike Moore, A Pacific Parliament. Asia Pacific Books, Wellington and the Institute of Pacific Studies, University of the South Pacific, Suva, 1982, pp. 86. No price given.

Australia and the South Pacific. Conference Papers and Reports. Centre for Continuing Education, Australian National University, Canberra, 1983, pp. 157. $8.00.

Alan R. Taylor, The Arab Balance of Power, Syracuse University Press, Syracuse, 1982, pp. xii + 165. $US22.00 (cloth) $US11.95 (paper).

Tareq Y. Ismael, Iraq and Iran: Roots of Conflict. Syracuse University Pess. Syracuse. 1982, pp xii + 226. $US24.00 (cloth) $US12.95 (paper).

Peter Gubser, Jordan: Crossroads of Middle Eastern Events. Croom Helm, London and Westview Press, Boulder, Colorado, 1983, pp. xi+ 139. £13.50.

Ibrahim Ibrahim (ed.), Arab Resources: The Transformation of a Society. Croom Helm, London, 1983, pp. 304. $24.25.

David Goldsworthy, The International Politics of the Namibian Dispute, Discussion Paper No. 3, 1982, pp. 41

Jock McCulloch, South Africa's Invasion of Angola: Many Reasons Why. Current Issues Brief No. 7, 1981, pp. 10 both published by the Legislative Research Service, Department of the Parliamentary Library, Canberra.  相似文献   

40.
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