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   6051篇
  免费   87篇
  国内免费   11篇
教育   4579篇
科学研究   343篇
各国文化   64篇
体育   510篇
综合类   4篇
文化理论   76篇
信息传播   573篇
  2022年   43篇
  2021年   72篇
  2020年   102篇
  2019年   164篇
  2018年   212篇
  2017年   230篇
  2016年   223篇
  2015年   143篇
  2014年   167篇
  2013年   1253篇
  2012年   187篇
  2011年   173篇
  2010年   187篇
  2009年   166篇
  2008年   188篇
  2007年   185篇
  2006年   144篇
  2005年   133篇
  2004年   136篇
  2003年   110篇
  2002年   126篇
  2001年   91篇
  2000年   131篇
  1999年   96篇
  1998年   87篇
  1997年   73篇
  1996年   82篇
  1995年   65篇
  1994年   80篇
  1993年   78篇
  1992年   57篇
  1991年   81篇
  1990年   64篇
  1989年   63篇
  1988年   45篇
  1987年   60篇
  1986年   51篇
  1985年   57篇
  1984年   56篇
  1983年   42篇
  1982年   37篇
  1981年   35篇
  1980年   34篇
  1979年   29篇
  1978年   33篇
  1977年   41篇
  1976年   37篇
  1975年   22篇
  1974年   25篇
  1971年   15篇
排序方式: 共有6149条查询结果,搜索用时 31 毫秒
1.
2.
Measuring Search Engine Quality   总被引:12,自引:3,他引:9  
The effectiveness of twenty public search engines is evaluated using TREC-inspired methods and a set of 54 queries taken from real Web search logs. The World Wide Web is taken as the test collection and a combination of crawler and text retrieval system is evaluated. The engines are compared on a range of measures derivable from binary relevance judgments of the first seven live results returned. Statistical testing reveals a significant difference between engines and high intercorrelations between measures. Surprisingly, given the dynamic nature of the Web and the time elapsed, there is also a high correlation between results of this study and a previous study by Gordon and Pathak. For nearly all engines, there is a gradual decline in precision at increasing cutoff after some initial fluctuation. Performance of the engines as a group is found to be inferior to the group of participants in the TREC-8 Large Web task, although the best engines approach the median of those systems. Shortcomings of current Web search evaluation methodology are identified and recommendations are made for future improvements. In particular, the present study and its predecessors deal with queries which are assumed to derive from a need to find a selection of documents relevant to a topic. By contrast, real Web search reflects a range of other information need types which require different judging and different measures.  相似文献   
3.
4.
A growing number of studies examine the influence of individual factors on acculturation attitudes of immigrants, but few studies focus on majority members’ attitudes. In this paper, two studies are reported on the relation between attachment styles and acculturation attitudes of both immigrants (N=177) and majority members (N=243) in the Netherlands. Until now very few studies have associated cultural adjustment with attachment styles. This is remarkable, because attachment theory refers to interaction with others in new situations. Four different styles of attachment (the secure, dismissing, preoccupied and fearful attachment styles) are related to Berry's classification of acculturation attitudes. People, both immigrants and majority members, with a secure attachment style were positive towards integration, whereas people with a dismissing attachment style were not. Dismissing immigrants were more positive towards separation. Whereas both immigrants and majority members with a secure attachment style showed a similar pattern of correlations between attachment and acculturation, they seem to react quite differently, and even in opposite ways, when they have a preoccupied attachment style. Yet, the different reactions may be caused by the same psychological process: The existential ambivalence of preoccupied people may lead to diverse reactions.  相似文献   
5.
6.
The Copyright Licensing and Administration Society of Singapore was established in 1999. It is now profitable and commercially significant, perhaps uniquely so in Asia. Critical factors in its growth have included a statutory (non‐voluntary) photocopying licence provision for educational institutions in the Copyright Act; and widespread support from the local and international communities of rightsholders. Tentative consensus has been established with educators over a fair level of remuneration for copying. Further work needs to be done to extend or amend the current model for electronic copying, for the private sector and for other countries in the region.  相似文献   
7.
8.
During the rewriting of its program in the early 1980s, theRassemblement pour la République (RPR) carried out anumber of opinion surveys. The person in charge of this wasnot a member of the inner leadership circle; he warned the partyleader, Jacques Chirac, that themes forming a coherent ‘liberal’program for the transformation of the relationship between citizens,state, and the economy, were not popular with public opinion,which remained attached to progressive taxation and a comprehensivesocial welfare system. The party leadership ignored these warnings.Rather than attempting to align their policies with voter aspirations,their principal use of political communications techniques aimedat improving their leader's image. The person in charge of thiswork was a stranger to politics whose understanding of the waycultural or political attitudes are changed led him to interpretvery fatalistically the chances of influencing election outcomesby communications techniques. His methods were treated withfrank skepticism by party communications colleagues, his client'spersonality was particularly unamenable to his efforts, andhis one successful initiative—the rejuvenation of theexecutive committee—was operated at the cost of a rowin the party. In the case of the RPR, opinion research seemsto have played no role at all in an important party policy review,the causes of which should be sought elsewhere.  相似文献   
9.
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