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   442篇
  免费   25篇
  2021年   2篇
  2020年   7篇
  2019年   15篇
  2018年   15篇
  2017年   15篇
  2016年   25篇
  2015年   14篇
  2014年   11篇
  2013年   134篇
  2012年   17篇
  2011年   13篇
  2010年   8篇
  2009年   16篇
  2008年   6篇
  2007年   7篇
  2006年   8篇
  2005年   4篇
  2004年   10篇
  2003年   6篇
  2002年   8篇
  2001年   2篇
  2000年   5篇
  1999年   5篇
  1998年   6篇
  1997年   5篇
  1995年   7篇
  1994年   4篇
  1993年   3篇
  1991年   5篇
  1990年   2篇
  1989年   3篇
  1988年   2篇
  1986年   3篇
  1985年   6篇
  1984年   8篇
  1983年   5篇
  1982年   6篇
  1981年   4篇
  1980年   7篇
  1979年   4篇
  1978年   5篇
  1977年   3篇
  1976年   5篇
  1975年   4篇
  1974年   1篇
  1973年   3篇
  1972年   2篇
  1971年   2篇
  1970年   1篇
  1969年   4篇
排序方式: 共有467条查询结果,搜索用时 31 毫秒
31.
ABSTRACT.  In this paper we employ dichotomous, multinomial and conditional logit models to analyze the employment-migration behavior of some 380,000 U.K. university graduates. By controlling for a range of variables related to human capital acquisition and local economic conditions, we are able to distinguish between different types of sequential migration behavior from domicile to higher education and on to employment. Our findings indicate that U.K. female graduates are generally more migratory than male graduates. We suggest that the explanation for this result lies in the fact that migration can be used as a partial compensation mechanism for gender bias in the labor market.  相似文献   
32.
Between 1876 and 1881 Massachusetts experienced an outbreak of human rabies (hydrophobia). The entire state--the Governor, the legislature, the State Board of Health, newspapers, and the citizenry and elected officials of every town and city--reacted to the disease. Central to the response was the Commonwealth's legislature--called the General Court. Through public hearings, their own debates, and the passage of legislation, it resolved widespread fear and anger, mediated conflicting concepts of disease, and promoted social solidarity in the face of an epidemic. This article first narrates the General Court's legislative actions; it then examines the conflicting understandings of disease causality; finally, it explores the social and political rituals the legislature drew upon to deal with this public health crisis. Arguing that public health legislation is simultaneously instrumental and symbolic, this article demonstrates that attention to both enriches the study of epidemics, historical and yet to come.  相似文献   
33.
34.
35.
Poropat, S.F., Nair, J.P., Syme, C.E., Mannion, P.D., Upchurch, P., Hocknull, S.A., Cook, A.G., Tischler, T.R. &; Holland, T. XX.XXXX. 2017. Reappraisal of Austrosaurus mckillopi Longman, 1933 Longman, H.A., 1933. A new dinosaur from the Queensland Cretaceous. Memoirs of the Queensland Museum 10, 131144. [Google Scholar] from the Allaru Mudstone of Queensland, Australia’s first named Cretaceous sauropod dinosaur. Alcheringa 41, 543–580. ISSN 0311-5518

Austrosaurus mckillopi was the first Cretaceous sauropod reported from Australia, and the first Cretaceous dinosaur reported from Queensland (northeast Australia). This sauropod taxon was established on the basis of several fragmentary presacral vertebrae (QM F2316) derived from the uppermost Lower Cretaceous (upper Albian) Allaru Mudstone, at a locality situated 77 km west-northwest of Richmond, Queensland. Prior to its rediscovery in 2014, the type site was considered lost after failed attempts to relocate it in the 1970s. Excavations at the site in 2014 and 2015 led to the recovery of several partial dorsal ribs and fragments of presacral vertebrae, all of which clearly pertained to a single sauropod dinosaur. The discovery of new material of the type individual of Austrosaurus mckillopi, in tandem with a reassessment of the material collected in the 1930s, has facilitated the rearticulation of the specimen. The resultant vertebral series comprises six presacral vertebrae—the posteriormost cervical and five anteriormost dorsals—in association with five left dorsal ribs and one right one. The fragmentary nature of the type specimen has historically hindered assessments of the phylogenetic affinities of Austrosaurus, as has the fact that these evaluations were often based on a subset of the type material. The reappraisal of the type series of Austrosaurus presented herein, on the basis of both external morphology and internal morphology visualized through CT data, validates it as a diagnostic titanosauriform taxon, tentatively placed in Somphospondyli, and characterized by the possession of an accessory lateral pneumatic foramen on dorsal vertebra I (a feature that appears to be autapomorphic) and by the presence of a robust ventral mid-line ridge on the centra of dorsal vertebrae I and II. The interpretation of the anteriormost preserved vertebra in Austrosaurus as a posterior cervical has also prompted the re-evaluation of an isolated, partial, posterior cervical vertebra (QM F6142, the ‘Hughenden sauropod’) from the upper Albian Toolebuc Formation (which underlies the Allaru Mudstone). Although this vertebra preserves an apparent unique character of its own (a spinopostzygapophyseal lamina fossa), it is not able to be referred unequivocally to Austrosaurus and is retained as Titanosauriformes indet. Austrosaurus mckillopi is one of the oldest known sauropods from the Australian Cretaceous based on skeletal remains and potentially provides phylogenetic and/or palaeobiogeographic context for later taxa such as Wintonotitan wattsi, Diamantinasaurus matildae and Savannasaurus elliottorum.

Stephen F. Poropat* [; ] Department of Chemistry and Biotechnology, Swinburne University of Technology, John St, Hawthorn, Victoria 3122, Australia; Jay P. Nair [; ] School of Biological Sciences, The University of Queensland, St Lucia, Queensland 4072, Australia; Caitlin E. Syme [] School of Biological Sciences, The University of Queensland, St Lucia, Queensland 4072, Australia; Philip D. Mannion [] Department of Earth Science and Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK; Paul Upchurch [] Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, UK; Scott A. Hocknull [] Geosciences, Queensland Museum, 122 Gerler Rd, Hendra, Queensland 4011, Australia; Alex G. Cook [] School of Earth Sciences, The University of Queensland, St Lucia, Queensland 4072, Australia; Travis R. Tischler [] Australian Age of Dinosaurs Museum of Natural History, Lot 1 Dinosaur Drive, PO Box 408, Winton, Queensland 4735, Australia; Timothy Holland [] Kronosaurus Korner, 91 Goldring St, Richmond, Queensland 4822, Australia. *Also affiliated with: Australian Age of Dinosaurs Museum of Natural History, Lot 1 Dinosaur Drive, PO Box 408, Winton, Queensland 4735, Australia.  相似文献   
36.
26 sites with Pre‐Columbian (Taíno) rock art are known in Jamaica, most with petroglyphs only, but there are four with painted images, and three of these are discussed: Mountain River Cave, Potoo Hole, and Spot Valley Cave. In addition, an account is given of the Warminster rock shelter, which has petroglyphs described as among the best remaining in Jamaica. Spot Valley Cave was newly surveyed in 2005, with the help of the Jamaican Caves Organization, and in the same year a rescue operation to restore the Warminster petroglyphs was carried out, in cooperation with Dr Johannes Loubser. Comparisons are made, where appropriate, to Taíno artefacts in different materials, and also to Pre‐Columbian images on other islands in the Caribbean, notably Puerto Rico. The interpretation of the Taíno images, in Jamaica and elsewhere, relies to a considerable extent on the “Account of the Antiquities of the Indians”, compiled by Fray Ramón Pané in 1494–1498, on the express instructions of Columbus. Whatever the shortcomings of a narrative compiled by an outsider, we would be much worse off without it.  相似文献   
37.
38.
39.
40.
This paper assumes that there is something in the logic of the capitalist mode of production such that, in the words of Marx and Engels' Communist Manifesto, it “must nestle everywhere, settle everywhere, establish connections everywhere,” giving a “cosmopolitan character to production and consumption in every country.” It assumes, that is, that there is an inherent tendency in capitalism to seek to globalize. Further, it is argued that one can plausibly claim that the capitalist mode of production has succeeded, or is succeeding, in globalizing against the countervailing forces of the managing state and organized labor. It is argued that this development represents, to use Marcuse's words, something like a “closing of the universe of discourse” or a “paralysis of criticism” and the emergence of a “society without opposition,” but in a context, in crucial respects, fundamentally different from that analysed by Marcuse in the 1960s.  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