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   28641篇
  免费   217篇
  国内免费   10篇
教育   21205篇
科学研究   2651篇
各国文化   143篇
体育   1733篇
综合类   10篇
文化理论   509篇
信息传播   2617篇
  2021年   144篇
  2020年   211篇
  2019年   351篇
  2018年   2648篇
  2017年   2610篇
  2016年   2036篇
  2015年   427篇
  2014年   498篇
  2013年   3281篇
  2012年   619篇
  2011年   1202篇
  2010年   1165篇
  2009年   722篇
  2008年   1055篇
  2007年   1475篇
  2006年   424篇
  2005年   636篇
  2004年   707篇
  2003年   597篇
  2002年   405篇
  2001年   356篇
  2000年   358篇
  1999年   293篇
  1998年   163篇
  1997年   207篇
  1996年   205篇
  1995年   214篇
  1994年   169篇
  1993年   203篇
  1992年   259篇
  1991年   230篇
  1990年   240篇
  1989年   259篇
  1988年   269篇
  1987年   227篇
  1986年   218篇
  1985年   239篇
  1984年   214篇
  1983年   245篇
  1982年   185篇
  1981年   177篇
  1980年   178篇
  1979年   245篇
  1978年   193篇
  1977年   175篇
  1976年   160篇
  1975年   135篇
  1974年   131篇
  1973年   138篇
  1971年   112篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
961.
The need to provide bibliographic access to a collection of original medical illustrations led the Library of the University of California, San Francisco, to search for a bibliographic control system and, not finding a satisfactory one, to develop one of its own, Part 1 of the report details the planning for such a development, including the need for bibliographic control of illustrations, the goals of the proposed system, design decisions and changes required, the type of system chosen, special subjects indexing needs, the required output, and staffing and budgetary needs.  相似文献   
962.
963.
The purpose of this paper was to examine the problems and opportunities of academic prediction for different ethnic groups. Several recent studies of academic prediction for blacks and whites were reviewed in regard to: 1) the situation in which the data were obtained; 2) the prediction technique employed, and 3) the data distribution likely to give rise to the obtained prediction indices. It was suggested that a total-group regression equation which "benefits" a minority group by overpredicting mean grade may actually be very disadvantageous if accompanied by a large error of estimate. The damage can be produced by precluding selection of the most qualified minority group members and thus lowering the groups' performance. Differential process theory was proposed as a potential source of explanations for differential prediction. It was proposed that alternative strategic approaches to scholastic tasks might alter the covariance of predictor tests with grades. Finally, it was suggested that, under certain circumstances, the patterns of standardized regression weights in the prediction of grades, might suggest group difference in problem-solving strategies.  相似文献   
964.
965.
966.
967.
968.
969.
970.
Problems in interagency collaboration: Lessons from a project that failed   总被引:1,自引:0,他引:1  
Several institutions (e.g., child welfare, police, court, health, education, social service) are necessarily involved in the management of child abuse in all communities. The need for better cooperation among them has been acknowledged; inquests into child deaths resulting from abuse have often attributed some blame to faulty communication and/or poor cooperation between the institutions. The Community Child Abuse Team (CCAT) Project was designed by these same institutions in Hamilton, Ontario, to maximize interagency collaboration. The hypothesis, that this "interagency collaboration" model would provide more efficient and effective services to abused children and their families, was never tested. During its 30 months of operation the CCAT program never materialized as planned and funding was terminated. This paper describes selected problems and issues that arose during the struggle to implement the project. The central problematic issue was control. Those responsible for the project lacked the power to insist that the design be adhered to during the initial stage.  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