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   4052篇
  免费   67篇
  国内免费   4篇
教育   2954篇
科学研究   270篇
各国文化   73篇
体育   377篇
综合类   1篇
文化理论   43篇
信息传播   405篇
  2023年   13篇
  2022年   16篇
  2021年   43篇
  2020年   75篇
  2019年   120篇
  2018年   151篇
  2017年   158篇
  2016年   145篇
  2015年   97篇
  2014年   133篇
  2013年   960篇
  2012年   117篇
  2011年   106篇
  2010年   88篇
  2009年   103篇
  2008年   126篇
  2007年   113篇
  2006年   104篇
  2005年   102篇
  2004年   94篇
  2003年   75篇
  2002年   85篇
  2001年   53篇
  2000年   63篇
  1999年   62篇
  1998年   48篇
  1997年   44篇
  1996年   57篇
  1995年   43篇
  1994年   52篇
  1993年   31篇
  1992年   49篇
  1991年   34篇
  1990年   44篇
  1989年   35篇
  1988年   26篇
  1987年   25篇
  1986年   24篇
  1985年   20篇
  1984年   22篇
  1983年   15篇
  1982年   24篇
  1981年   26篇
  1980年   21篇
  1979年   14篇
  1978年   21篇
  1976年   16篇
  1975年   13篇
  1974年   20篇
  1973年   15篇
排序方式: 共有4123条查询结果,搜索用时 296 毫秒
1.
Research in Higher Education - Increasingly, undergraduates take more than 4 years to complete a baccalaureate, a situation widely perceived as a waste of time and money, for students,...  相似文献   
2.
3.
In the IR field it is clear that the value of a system depends on the cost and benefit profiles of its users. It would seem obvious that different users would prefer different systems. In the TREC-9 filtering track, systems are evaluated by a utility measure specifying a given cost and benefit. However, in the study of decision systems it is known that, in some cases, one system may be unconditionally better than another. In this paper we employ a decision theoretic approach to find conditions under which an Information Filtering (IF) system is unconditionally superior to another for all users regardless of their cost and benefit profiles.It is well known that if two IF systems have equal precision the system with better recall will be preferred by all users. Similarly, with equal recall, better precision is universally preferred. We confirm these known results and discover an unexpected dominance relation in which a system with lower recall will be universally preferred provided its precision is sufficiently higher.  相似文献   
4.
The economic success of some of the countries within the East Asian region has generated a range of studies which have attempted to identify the sources of that growth. One strand within these analyses has focused on the critical role of schooling in the accumulation of human capital. This paper examines the role which education has played in the rapid development of the four 'Asian Tigers'; namely: Hong Kong, Taiwan, South Korea and Singapore. It is argued that whilst patterns of educational provision displayed some common features there were also significant differences in other areas such as the role of the state, sources of educational funding, the role of technical education and of the school curriculum.  相似文献   
5.
The purpose of this study was to develop a portable force measurement system for ice hockey skating. The system consisted of three strain gauge pairs affixed to an ice hockey skate’s blade holder with wire leads connected to a microprocessor controlled data acquisition device carried in a backpack worn by the skater. The configuration of the strain gauges simultaneously determined the vertical and medial–lateral force components experienced by the blade holder with a resolution accuracy of 1.9 N and a coefficient of variation of 9.2%. On-ice testing of this system with subjects performing forward start, acceleration, and constant velocity skating permitted unencumbered, natural movement and demonstrated clear, unambiguous signal responses, high trial-to-trial repeatability, and easy data retrieval. The practicality and accuracy of this testing approach have many applications, such as a quantitative tool for skating force assessment to aid athletes and coaches, as well as providing the means to examine other skill-specific dynamics.  相似文献   
6.
Our argument in this paper is that the model of literary progression which Bakhtin (1981, 1986) expounds in his writing on the chronotope can generate insight into the processes through which pupils improve their writing. We suggest more generally that there are concepts and clues in Bakhtin's historical model of the development of the European novel and in his theory of dialogue which can be helpful in both the evaluation and teaching of classroom writing.  相似文献   
7.
8.
9.
For centuries publishers have acted as intermediaries between author and audience. Copyright, like freedom of expression, is an essential element of freedom in this role, because without it authors' rights are not fully protected. Only when they are protected against theft and other economic or moral infringements are authors free to express themselves without fear. Publishers, too, rely on copyright to protect their investments and their freedom Paul Nijhoff Asser has been secretary of the International Group of Scientific, Technical and Medical Publishers (STM), Amsterdam, since 1970. He has been active in publishing and bookselling for more than forty years. This article was adapted from a presentation at the seminar “East Meets West: Copyright and the Publisher in a Market Economy”, Hamburg, March 1991.  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