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   17320篇
  免费   253篇
  国内免费   30篇
教育   12258篇
科学研究   1722篇
各国文化   159篇
体育   1523篇
综合类   9篇
文化理论   158篇
信息传播   1774篇
  2021年   177篇
  2020年   248篇
  2019年   373篇
  2018年   499篇
  2017年   495篇
  2016年   497篇
  2015年   333篇
  2014年   425篇
  2013年   3207篇
  2012年   406篇
  2011年   436篇
  2010年   420篇
  2009年   350篇
  2008年   409篇
  2007年   375篇
  2006年   336篇
  2005年   300篇
  2004年   322篇
  2003年   283篇
  2002年   267篇
  2001年   509篇
  2000年   394篇
  1999年   324篇
  1998年   190篇
  1997年   216篇
  1996年   187篇
  1995年   168篇
  1994年   192篇
  1993年   153篇
  1992年   210篇
  1991年   234篇
  1990年   226篇
  1989年   222篇
  1988年   188篇
  1987年   196篇
  1986年   195篇
  1985年   234篇
  1984年   196篇
  1983年   159篇
  1982年   149篇
  1981年   143篇
  1980年   134篇
  1979年   172篇
  1978年   148篇
  1977年   139篇
  1976年   102篇
  1975年   124篇
  1974年   116篇
  1973年   111篇
  1971年   97篇
排序方式: 共有10000条查询结果,搜索用时 203 毫秒
91.
92.
The present study examined three hypotheses regarding the consequences of early brain damage for academic achievement: First, early brain insults will have a negative impact on achievement, even in children with normal intelligence. Second, underachievement in these children will be at least partially independent of IQ (i.e., not fully accounted for by a lowering of IQ within the average range). Third, normally intelligent children with histories of brain insult will also manifest selective cognitive dysfunctions. To test these hypotheses, we compared two groups of children who had recovered from Haemophilus influenzae type b meningitis. The "complicated" group consisted of children who, as a consequence of having sustained neurologic complications during their illness, were more likely to have had brain insults. Children in the "uncomplicated" group did not have complications with their illness and were regarded as having escaped significant central nervous system (CNS) pathology. Only children with normal hearing and a prorated Full Scale IQ of at least 80 (WISC-R) were considered. Group differences on the Wide Range Achievement Test-Revised were consistent with the first two hypotheses. Although the two groups had similar Verbal IQs, the complicated group also had a lower mean Performance IQ and performed less well on perceptually demanding neuropsychological tasks. Findings suggest that learning disabilities may have selective, brain-related cognitive antecedents; but they challenge the practice of using IQ criteria for clinical diagnosis.  相似文献   
93.
94.
95.
96.
97.
98.
J. Franklin Jameson and Waldo G. Leland remain forever linked in American archival history as the founders, respectively, of the National Archives and the American archival profession. From the immediate post-Revolutionary period until the eve of the First World War, American historians recognized that their nation's early history remained locked in European archives. However, not until the pioneering efforts of Leland, working under supervision of Jameson during the early 20th century, did any of these historical researchers bring to the United States, along with the voluminous copies of archival documents, the emerging tenets of European archival theory. This is the story of the collaboration between Jameson and Leland, and of Leland's efforts to professionalize American archival practice on the basis of European archival theory.  相似文献   
99.
100.
There is growing research on voting behavior in referendums.However, the dynamics of opinion formation in popular referendums,referendums initiated by the electorate to approve or rejectdecisions made by representative bodies, has not yet been studied.This is especially unfortunate as voting decisions in popularreferendums differ from those in other referendums in interestingways. Opinion formation can be a very dynamic process in popularreferendums, making the referendum campaign crucial. This paperstudies the dynamics of opinion formation in popular referendumsand relates them to particular characteristics of the campaignsand the issues at hand. Based on the literature, we consideredthe effects of the intensity of the yes and no campaigns, familiaritywith the issue, and partisan cues. Our study uses content analysisdata and data from public opinion surveys dealing with variouspopular referendums held in the Netherlands. The study revealedseveral factors that contributed to the volatility of opinionsin the referendum campaigns: the issue (new and did not fittraditional political schemes), lack of support from societaland community organizations for the position of the local authorities,and low profile campaigns on the part of local authorities.While some of these factors are general and may play a rolein referendums everywhere, some can be considered ‘typicallyDutch’, related to the characteristics of popular referendumsin the Netherlands and the country’s political system.  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