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   6707篇
  免费   336篇
  2023年   57篇
  2020年   144篇
  2019年   133篇
  2018年   271篇
  2017年   290篇
  2016年   273篇
  2015年   195篇
  2014年   167篇
  2013年   1798篇
  2012年   166篇
  2011年   177篇
  2010年   178篇
  2009年   161篇
  2008年   174篇
  2007年   127篇
  2006年   120篇
  2005年   90篇
  2004年   81篇
  2003年   77篇
  2002年   80篇
  2001年   82篇
  2000年   83篇
  1999年   96篇
  1998年   81篇
  1997年   59篇
  1996年   67篇
  1995年   62篇
  1994年   58篇
  1993年   71篇
  1992年   62篇
  1991年   43篇
  1990年   43篇
  1989年   64篇
  1988年   51篇
  1987年   60篇
  1986年   59篇
  1985年   79篇
  1984年   96篇
  1983年   83篇
  1982年   69篇
  1981年   76篇
  1980年   77篇
  1979年   71篇
  1978年   71篇
  1977年   57篇
  1976年   75篇
  1975年   77篇
  1974年   49篇
  1973年   39篇
  1972年   36篇
排序方式: 共有7043条查询结果,搜索用时 15 毫秒
41.
42.
"An empirical test of the effects of exogenous shocks upon a region's population size is conducted in the framework of an equilibrium locational model. The model emphasizes the separation of endogenous from exogenous factors, a point omitted in most empirical studies of aggregate migration. Exogenous changes are manifested in the local relative cost of living and the local relative unemployment rate. Hypotheses are tested using a national sample of youth, in addition to census, data [for the United States]. Surprisingly, a simple measure of the size of shock to a regional economy has the greatest explanatory power compared to more sophisticated measures based on prior business cycles."  相似文献   
43.
ABSTRACT. This paper uses a two-stage hedonic wage approach to derive the benefits from improvement of five cultural amenities. It is argued that the hedonic approach permits valuation of both private and local public aspects of cultural goods since access to the amenity is an essential input in the production of the final service flow. Empirical estimates of willingness to pay suggest price and income elasticities are approximately unity. Lower-bound estimates of marginal benefits for a representative city range from $0.85 million for an additional theater to $57.9 million for an additional zoo facility.  相似文献   
44.
ABSTRACT. The distribution of above-median income groups can be described accurately by OLS regression of the Pareto distribution. The excellent fit of log-linear regression has led some researchers to conclude that extrapolated income measures in the open end of the distribution are reliable. The analysis of income distribution data for metropolitan areas reveals: (1) that OLS tends to consistently overestimate the number of families in the tail, and (2) that the overestimation can have serious implications for hypothesis testing.  相似文献   
45.
"This paper presents a two-sector dynamic model of regional population change. The model contains a migration equation, an earnings equation, and an amenity equation for each region. In the context of this model, migration is seen as a disequilibrium process through which the regional populations move towards equilibrium positions. Migration occurs when one region is perceived to be superior to the other on the basis of its earnings and amenity levels. Equilibrium is achieved when population movements between the regions eliminate any differences in their relative attractiveness. A comparative-static analysis of the model is presented to analyze the effects of policy changes and exogenous shocks on the distribution of population among the regions." The geographical focus is on the United States.  相似文献   
46.
47.
48.
Book reviews     
Peter Edwards with Gregory Pemberton. Crises and Commitments: The Politics and Diplomacy of Australia's Involvement in Southeast Asian Conflicts 1948–1965. Sydney: Allen & Unwin, in association with the Australian War Memorial, 1992. xix + 515 pp. $45.00.

J.D.B. Miller and RJ. Vincent (eds). Order and Violence: Hedley Bull and International Relations. Oxford: Clarendon Press, 1990. vii + 220 pp. $55.00.

Carl Bridge (ed.). Munich to Vietnam. Melbourne: Melbourne University Press, 1991. 237 pp. $24.95.

Gary Brown. Breaking the American Alliance. Canberra Papers on Strategy and Defence No.54, 1989. 171pp. $17.00.

G. Withers (ed.). Commonality and Difference: Australia and the United States. Australian Fulbright Papers No.1. Sydney: Allen & Unwin for the Australian‐American Educational Foundation, 1991. 138 pp. $19.95.

John S. Gibson. International Organizations, Constitutional Law and Human Rights. New York: Praeger, 1991. xvii + 265 pp. $US45.00.

J. Ronald Engel and Joan Gibb Engel (eds). Ethics of Environment and Development: Global Challenge and International Response. Tucson: University of Arizona Press, in association with the IUCN, 1990. xv + 264 pp. $US29.95 (cloth), $US14.95 (paper).

Stephen Ryan. Ethnic Conflict and International Relations. Aldershot: Dartmouth Publishing, 1991. xxviii + 200 pp. No price given.

K.M. de Silva and R.J. May (eds). Internationalization of Ethnic Conflicts. London: Pinter Publishers for International Centre for Ethnic Studies, Sri Lanka, 1991. x + 272 pp. $84.25.

Robert C.R. Siekmann. National Contingents in United Nations Peace‐Keeping Forces. Doedrecht: Martinus Nijhoff, 1991. xv + 229 pp. $US82.00.

Mara R. Bustelo and Philip Alston (eds). Whose New World Order? What Role for the United Nations? Leichhardt: The Federation Press, 1991. xiv + 157 pp. No price given.

H. Brauch and R. Kennedy (eds). Alternative Conventional Defense Postures in the European Theater: The Impact of Political Change on Strategy, Technology, and Arms Control. New York: Crane Russak; Basingstoke: Taylor and Francis, 1992. xxi + 279 pp. £35.00.

Robert F. Miller (ed.). The Development of Civil Society in Communist Systems. Sydney: Allen & Unwin, 1992. iv + 187 pp. $19.95.

David W. Hunter. Western Trade Pressure on the Soviet Union. An Interdependence Perspective on Sanctions. Basingstoke: Macmillan, 1991. xii + 163 pp. £40.00.

Paul Hainsworth (ed.). Breaking and Preserving the Mould: The Third Direct Elections to the European Parliament (1989) — the Irish Republic and Northern Ireland. Belfast and Coleraine: Policy Research Institute, The Queen's University of Belfast and the University of Ulster, 1992. v + 223pp. £9.95.

Yue‐man Yeung and Xu‐wei Hu (eds). China's Coastal Cities: Catalysts of Modernization. Honolulu: University of Hawaii Press, 1992. xvi + 330 pp. $US38.00 (cloth).

Freedom in Exile. The Autobiography of the Dalai Lama of Tibet. Cardinal Books, 1991. 308 pp.

Vo Nhan Tri. Vietnam's Economic Policy Since 1975. Singapore: Institute of South East Asian Studies, 1990. xi + 253 pp. $S42.50 (cloth), $S32.00 (paper).

Robert Hopkins Miller. The United States and Vietnam 1787–1941. Washington, DC: National Defense University Press, 1990. ix + 234 pp. No price given.

Judith A. Stowe. Siam Becomes Thailand: A Story of Intrigue. Honolulu: University of Hawaii Press, 1991. xii + 394 pp. $US39.00 (cloth), $US16.95 (paper).

Salim Said. Genesis of Power. General Sudirman and the Indonesian Military in Politics 1945–49. North Sydney: Allen & Unwin, 1992. xxi + 185 pp. $24.95.

Burhan Magenda. East Kalimantan: The Decline of a Commercial Aristocracy. Ithaca: Cornell Modern Indonesia Project, Cornell University, 1991. viii + 113 pp. $US11.00.

Khong Kim Hoong. Malaysia's General Election 1990: Continuity, Change and Ethnic Politics. Singapore: ISEAS, 1991. 54 pp. $US5.00.

Stephanie Lawson. The Failure of Democratic Politics in Fiji. Oxford: Clarendon Press, 1991. vii + 307 pp. $90.00.

Asesela Ravuvu. The Facade of Democracy: Fijian Struggles for Political Control 1830–1987. Suva: Reader Publishing House, 1991. xii + 106 pp. $15.00.

William Sutherland. Beyond the Politics of Race. An Alternative History of Fiji to 1992. Political and Social Change Monograph No.15, Department of Political and Social Change, Australian National University, 1992. vii + 251 pp. $16.00.

Sue Rabbitt Roff. Overreaching in Paradise: United States Policy in Palau since 1945. Juneau, Alaska: The Denali Press, 1991. ix + 245 pp. No price given.

Gary Smith. Micronesia: Decolonisation and US Military Interests in the Trust Territory of the Pacific Islands. Canberra: Peace Research Centre, Australian National University, 1991. ix + 131 pp. $12.00.

Robert Aldrich (ed.). France, Oceania and Australia: Past and Present. Department of Economic History, University of Sydney, 1991. 203 pp. No price given.

Stephen Henningham. France and the South Pacific; A Contemporary History. Sydney: Allen and Unwin,1992. xvii + 292 pp. $24.95.

R. Briscoe, G.S. Nair and A. Sibbald. Enterprise Support Organizations for the South Pacific: Problems and Proposals. Honolulu: Pacific Islands Development Program, East‐West Center, 1991. xi + 89 pp. $US8.00.

Euan Fleming and Hugh Coulter (eds). Agricultural Export Marketing in the South Pacific: The Future Role of Marketing Authorities. Canberra: National Centre for Development Studies, Australian National University, Pacific Policy Paper 8, 1992. xii + 255 pp. $25.00.

M. Thea Sinclair and M.J. Stabler (eds). The Tourism Industry: An International Analysis. Wallingford: C.A.B. International, 1991. xi + 244 pp. £30.00.

D. Harrison (ed.). Tourism and the Less Developed Countries. London: Belhaven Press, 1992. xiii + 186 pp. £35.00.  相似文献   

49.
A palaeoecological approach was undertaken to investigate the last 400 years of change in vegetation, fire, nutrient mobility, lake productivity and erosion associated with Aboriginal and European land-use practices in a forested environment in eastern Victoria. Melaleuca ericifolia scrub, although present prior to European settlement, has expanded around Lake Curlip in the last 200 years, primarily due to the action of fire on a forest already weakened by drought. A fern understorey has declined in extent and a more open aspect has developed in the forest. Fire has been a major component of vegetation dynamics in the historical period. Erosion rates were comparatively low and associated with fire during prehistoric times, but after European settlement its increase is more closely related to land clearance and flooding than fire. The response of vegetation to both anthropogenic and natural influences changed during the historical period. Although fire is an integral part of vegetation change, it is not an over-riding effect at Lake Curlip. Drain construction in the swamp has reduced the impact that any accumulation of pasture improvement chemicals may have had on eutrophication of the lake.  相似文献   
50.
Glass finds from the first Bulgarian capital, Pliska, have been analysed by instrumental neutron activation analysis. The analytical data, together with previous results from analysis of glass samples from the second Bulgarian capital, Preslav, were subjected to cluster and discriminant analysis. The local origin of part of the analysed samples was proven and some conclusions about the technology of production were possible.  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