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   2918篇
  免费   44篇
  2020年   35篇
  2019年   38篇
  2018年   312篇
  2017年   255篇
  2016年   283篇
  2015年   42篇
  2014年   52篇
  2013年   459篇
  2012年   64篇
  2011年   189篇
  2010年   206篇
  2009年   88篇
  2008年   120篇
  2007年   119篇
  2006年   34篇
  2005年   61篇
  2004年   35篇
  2003年   30篇
  2002年   25篇
  2001年   32篇
  2000年   18篇
  1999年   23篇
  1998年   14篇
  1997年   17篇
  1996年   14篇
  1995年   14篇
  1994年   16篇
  1993年   15篇
  1992年   10篇
  1991年   14篇
  1990年   16篇
  1989年   17篇
  1988年   8篇
  1987年   15篇
  1986年   15篇
  1985年   19篇
  1984年   24篇
  1983年   14篇
  1982年   14篇
  1981年   16篇
  1980年   13篇
  1979年   24篇
  1978年   19篇
  1977年   11篇
  1976年   10篇
  1975年   17篇
  1974年   8篇
  1973年   7篇
  1972年   10篇
  1969年   6篇
排序方式: 共有2962条查询结果,搜索用时 15 毫秒
1.
2.
3.
The pro‐life movement regularly employs tactics of political harassment in its campaign against abortion. As the murder of the controversial abortion doctor George Tiller in Wichita, Kansas, demonstrated last year, such tactics often betray a potential for violence. This paper explores how the militant tactics of the pro‐life movement in the 1990s have contributed to the formation of a ‘new’ political identity in Kansas politics: that of the moderate Republican. But for those that seek to counter‐mobilize against the Christian right, the political stakes remain high.  相似文献   
4.
An axiomatic approach to distance is developed which focuses on those behavioral concepts of distance related to movement in space. In particular, spatial movement by behaving units is postulated to involve a choice from among some set of abstract trips in space, and implicitly, to involve the minimization of some relevant notion of trip costs. In this context, the relevant behavioral notion of distance in space is taken to be the minimum-cost distance generated by this choice process. These trip-cost concepts extend the classical notions of paths, path lengths, and shortest paths in metric spaces. Hence many of the analytical results of the paper involve extensions of classical shortest-path distance properties to minimum-cost distances. In addition to these extensions, a characterization theorem is given which specifies the possible functional relationships between trip costs and their associated path lengths. These relationships include most functional forms which are commonly employed in the literature.  相似文献   
5.
In 1985 a Neanderthal skeleton was found in the cave of Kebara in southern Mt. Carmel. Electron spin resonance (ESR) dates have been obtained on tooth enamel of gazelles found in layer X, just overlying the layer in which the skeleton was found. Assuming early uptake of uranium by the teeth, they yield an age of 60 ± 6 ka; assuming gradual, linear uptake of uranium yields an age of 64 ± 6 ka. Both age estimates are consistent with a previous estimate for the skeleton, based on TL dating of burnt flint, of 60 ± 4 ka.  相似文献   
6.
Reviews     
Australian

Bateman W. R. G. and Ward M. W. (eds), Australia's Offshore Maritime Interests, Canberra, Australian Centre for Maritime Studies, 1985, pp. 122. $15.00 (paper)

Stephen Castles, Mary Kalantzis, Bill Cope and Michael Morrissey, Mistaken Identity: Multiculturalism and the Demise of Nationalism in Australia, Sydney, Pluto Press, 1988, pp.152. $14.95 (paper)

Roger Gibbins, Federalism in the Northern Territory; Statehood and Aboriginal Political Development, Darwin, North Australia Research Unit, Australian National University, 1988, pp. 148. $14.00 (paper)

Dean Jaensch and Peter Loveday (eds), Challenge From The Nationals: The Territory Election 1987, Darwin, North Australia Research Unit, Australian National University, 1987, pp. 226. $20.00 (paper)

Constance Lever‐Tracy and Michael Quinlan, A Divided Working Class, London, Routledge & Kegan Paul, 1988, pp. 338. $29.95 (paper)

Peter Loveday and Peter McNab (eds), Australia's Seventh State, Darwin, The Law Society of the Northern Territory and the North Australia Research Unit, Australian National University, 1988, pp.322. $24.00 (paper)

Geoffrey Skene, Specialities of the House, Department of the Parliamentary Library/Australasian Political Studies Association, 1988, pp.59. $10.00 (paper)

Comparative and international

Chris Bellamy, The Future of Land Warfare, London and Sydney, Croom Helm, 1987, pp.302. £29.95 (cloth)

Cathy Downes Strategic and Defence Studies Centre Research School of Pacific Studies The Australian National University

Melanie Beresford, Vietnam: Politics, Economics and Society, London, Frances Pinter, 1988, pp.242. $19.95 (paper)

Vernon Bogdanor (ed.) Constitutions in Democratic Politics, Gower, for the Policy Studies Institute, Aldershot, 1988, pp.395. $59.00 (cloth)

Barry Coldrey, Faith and Fatherland: The Christian Brothers and the Development of Irish Nationalism 1838–1921, Dublin, Gill and Macmillan, 1988, pp. 338. £27.50

John Connell, New Caledonia or Kanaky? The Political History of a French Colony, Canberra, Australian National University, National Centre for Development Studies, Pacific Research Monograph No. 16,1987, pp.493. $25.00 (paper)

Michael Spencer, Alan Ward and John Connell (eds), New Caledonia: Essays in Nationalism and Dependency, St Lucia, University of Queensland Press, 1988, pp.253. $ 19.95 (paper)

Leon Epstein Political Parties in the American Mold, Wisconsin, University of Wisconsin Press, 1986, pp. 440. $US27.00 (cloth).

Keith Ewing, The Funding of Political Parties in Britain, Cambridge, U.K., Cambridge University Press, 1987, pp. 264. $70.00 (cloth)

Richard Higgott (ed.), New Directions in International Relations? Australian Perspectives, Canberra, Department of International Relations, Australian National University, 1988, pp. 223. $10.00 (paper)

Michael J Sheehan, Arms Control; Theory and Practice, Oxford, Basil Blackwell, 1988, pp. 188. $34.95 (paper)

Political theory and methodology

Boris Frankel, The Post‐Industrial Utopians, Cambridge, Polity Press, 1987, pp. 303. $29.95 (paper)

P. Gottfried and T. Fleming The Conservative Movement. Boston, Twayne Publishers, 1988, pp.125. US$7.95 (paper)

Peter C. Ordeshook, Game Theory and Politics: An Introduction, New York, Cambridge University Press, 1986, pp.511. $47.00 (paper)

A. Teichova, M. Levy‐Leboyer & H. Nussbaum (eds), Multinational Enterprise in Historical Perspective, Cambridge, Cambridge University Press, 1986, pp. 396. $107.00 (cloth).  相似文献   

7.
8.
Pompeiian-style (hourglass) grain mills are common at many Roman sites within the circum-Mediterranean countries. Three examples are known from Corfe Mullen, London and Hamworthy in southern Britain. Petrographic examination, chemical and microprobe analyses indicate that the Corfe Mullen millstone and the London donkey mill were imported from central France into southern Britain. The Hamworthy mill should be designated a ‘flat donkey mill’, and represents a recent (post-Roman) import from a volcanic source in Sardinia. There is no evidence of importation of Roman donkey mills from Germany or for transportation of such mills (or stylistic derivatives) north of London.  相似文献   
9.
Seleucia Pieria: an ancient harbour submitted to two successive uplifts   总被引:1,自引:0,他引:1  
Historical sources ascribe the foundation of Seleucia (Seleukeia) Pieria to Seleucos I Nikator, shortly before the foundation of Antioch in the late 4th century BC. The Seleucia Pieria site seems however to have been inhabited earlier, perhaps from around 700 BC, possibly by a Greek population under an Assyrian ruler. The city became of considerable military importance during the wars between the Ptolemies and the Seleucids; it was occupied by the Romans in the 1st century BC, but had practically disappeared in the 6th century AD.
Geomorphological surveys in the area have revealed the existence of elevated marine notches and rims bioconstructed by vermetids, oysters and calcareous algae, which occasionally erode or intersect the archaeological sites, showing that two rapid land uplift movements, probably of seismic origin, took place during the late Holocene. The first movement, which occurred about 2500 ± 100 years bp, was the strongest one and caused a local vertical displacement of about 1.7 m, which may have severely affected the earlier Greek settlement. Though several earthquakes are reported to have occurred in the area during the following ten centuries, none of them seem to have been strong enough to cause significant vertical displacements. The second movement occurred around 1400 years bp, probably in May 526 AD, when a great earthquake followed by tsunami waves is known to have caused devastating damage in Antioch and Seleucia. According to geomorphological data supported by several radiocarbon dates, the earthquake was accompanied by a 0.7 to 0 8 m upheaval. This seismotectonic event also caused a rapid silting of the Seleucia Pieria closed harbour basin and entrances, thus preventing its further use.  相似文献   
10.
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