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   6496篇
  免费   272篇
  2020年   89篇
  2019年   114篇
  2018年   161篇
  2017年   166篇
  2016年   195篇
  2015年   123篇
  2014年   139篇
  2013年   1963篇
  2012年   186篇
  2011年   215篇
  2010年   207篇
  2009年   170篇
  2008年   151篇
  2007年   148篇
  2006年   148篇
  2005年   93篇
  2004年   89篇
  2003年   92篇
  2002年   79篇
  2001年   89篇
  2000年   80篇
  1999年   97篇
  1998年   68篇
  1997年   57篇
  1996年   46篇
  1995年   65篇
  1994年   53篇
  1993年   58篇
  1992年   48篇
  1991年   54篇
  1990年   56篇
  1989年   58篇
  1988年   45篇
  1987年   58篇
  1986年   59篇
  1985年   67篇
  1984年   80篇
  1983年   77篇
  1982年   61篇
  1981年   66篇
  1980年   67篇
  1979年   73篇
  1978年   63篇
  1977年   61篇
  1976年   46篇
  1975年   49篇
  1974年   43篇
  1973年   54篇
  1972年   44篇
  1970年   42篇
排序方式: 共有6768条查询结果,搜索用时 15 毫秒
31.
32.
Charcot-Marie-Tooth disease is a hereditary motor and sensory neuropathy first described in 1886. Our increasing knowledge of this disease correlates well with the development of methods used in neurology over the past 100 years. Although its physiopathology and treatment is still not fully understood, current developments in techniques are opening the way to future discoveries. We have divided its history into three theoretical periods: the first from 1886 to 1956, which was devoted to clinical and pathological study of the disease; the second from 1956 to 1982, which saw the development of electromyography in the investigation of neuromuscular diseases; and the last and current period based upon genetic research, using the methods of molecular biology.  相似文献   
33.
Louis F. Miron  Ph.D. 《对极》1992,24(4):263-288
In this article, Louis F. Miron presents a case study of the effects of local ideology and culture on corporate-lead progrowth movements in New Orleans. Miron borrows from critical theory to illustrate how "hegemonic" ideologies such as economic growth may be resisted in local settings. The findings suggest that economic structural relations do not predetermine the course of human agency, and that the success of progrowth movements is contingent upon local cultural conditions and ethos. Through a document analysis of "fiscal reform," a pro-growth ideology advanced by corporate and political elites in New Orleans and throughout Louisiana, the author probes the connections among material conditions, ideology, and the politics of entrepreneurism.  相似文献   
34.
35.
Spatial compactness has been proposed as a suitable criterion for assessing whether electoral boundaries reflect partisan interests. Although several different measures of spatial compactness have been developed, only limited efforts have been made to compare and evaluate them in the context of electoral redistricting. This paper assesses alternative spatial compactness measures and applies conceptually appealing measures to the provincial ridings proposed by British Columbia's Royal Commission on Electoral Boundaries (1988).  相似文献   
36.
37.
38.
Three rare Himyaritic coins found in the territory of the ancient Hadramawt kingdom are published for the first time. Two of the coins bear the name of the king,'Amdan Bayyin, while the third has the name of Tha'ran Ya'ub.  相似文献   
39.
40.
An attempt has been made to relate steatite artifacts to the source of rock from which they were manufactured, using the distribution patterns of rare earth elements. Radiochemical- and instrumental-neutron activation analyses of Shetland steatites suggest that the use of rare earth elements in artifact provenancing may be unreliable. Concentrations of rare earth elements in many Shetland steatites are too low to be measured reliably by a cost effective method. The relative importance of primary igneous and secondary metasomatic processes in controlling steatite rare earth element geochemistry is discussed and geological arguments against the existence of unique rare earth ‘fingerprints’ for steatite are presented.  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