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   25964篇
  免费   471篇
  国内免费   37篇
教育   18694篇
科学研究   2187篇
各国文化   256篇
体育   2075篇
综合类   36篇
文化理论   241篇
信息传播   2983篇
  2022年   151篇
  2021年   261篇
  2020年   443篇
  2019年   622篇
  2018年   850篇
  2017年   958篇
  2016年   870篇
  2015年   531篇
  2014年   706篇
  2013年   5004篇
  2012年   670篇
  2011年   737篇
  2010年   570篇
  2009年   552篇
  2008年   622篇
  2007年   603篇
  2006年   540篇
  2005年   484篇
  2004年   445篇
  2003年   425篇
  2002年   432篇
  2001年   481篇
  2000年   454篇
  1999年   449篇
  1998年   249篇
  1997年   264篇
  1996年   289篇
  1995年   243篇
  1994年   243篇
  1993年   240篇
  1992年   331篇
  1991年   334篇
  1990年   353篇
  1989年   335篇
  1988年   330篇
  1987年   269篇
  1986年   277篇
  1985年   341篇
  1984年   289篇
  1983年   269篇
  1982年   213篇
  1981年   226篇
  1980年   183篇
  1979年   248篇
  1978年   221篇
  1977年   204篇
  1976年   172篇
  1975年   134篇
  1973年   157篇
  1972年   125篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
102.
103.
104.
105.
This article treats the prevalent confused mixture of utilitarian, art-and-knowledge-for-their-own-sake and ideological interpretations of the purpose of museums as a problem of epistemology, arguing that that key dimensions of museum knowledge (of objects, visitors, museums themselves, and of society) need to be integrated to achieve coherence. A new object-based, visitor-centred, storytelling epistemology is proposed. This would take an interdisciplinary approach and aim to unleash, rather than mute the real power of objects. It would address human destructiveness, as well as celebrating human creativity and the wonders of nature. It would respect the meaning-making practices of real, as opposed to idealized, imaginary visitors, and promote staff self-awareness in managing bureaucratic drift into introversion and avoidance of difficult issues. Incorporating a theory of justice, it would erode boundaries created by presentation traditions which, though marginal to object experiences, discriminate in favour of specific social groups—often groups with whom staff identify. Providing a museum service on a visibly fair basis is essential for museums to achieve intellectual coherence as well as societal support.  相似文献   
106.
We report on a research study commissioned by ALPSP into the factors affecting journal cancellations and, in particular, on the impact of the free availability of journal articles via open access repositories.  相似文献   
107.
This study sought to determine if exposure to two communication-oriented activities, videotapes and public service announcements, accounts for changes in substance use among adolescents participating in the Drug Resistance Strategies Project's keepin' it REAL adolescent substance use prevention curriculum. Middle-school students (4,734, 72% Latino) responded to questionnaires related to these analyses. An analysis of covariance (ANCOVA) model was fit separately to six substance use outcomes. The results suggested that intervention students who saw four or five videos engaged in less substance use in the past month than did students who saw fewer videos. Having seen the PSAs one or more times did not predict the reported change in substance use.  相似文献   
108.
Evaluators of library programs have different perspectives on why to conduct an evaluation and also how to do so. The author suggests that a minimal approach to conducting a library program evaluation is to prove that the program exists. But this perspective has expanded to include different degrees of interest in the client and operations, culminating in a combined focus that leads evaluators to conduct outcome assessments. The chapter includes speculation on what motivates managers to undertake an evaluation, a review of some ways that library evaluations are conducted, and a discussion of several examples of program evaluations. Though there are not single directives for undertaking a library program evaluation, there are a variety of tools and advice to entice librarians to do more of them as a way to improve understanding the value of a library to its clientele and in society.  相似文献   
109.
PURPOSE: This study describes the system architecture and user acceptance of a suite of programs that deliver information about newly updated library resources to clinicians' personal digital assistants (PDAs). DESCRIPTION: Participants received headlines delivered to their PDAs alerting them to new books, National Guideline Clearinghouse guidelines, Cochrane Reviews, and National Institutes of Health (NIH) Clinical Alerts, as well as updated content in UpToDate, Harrison's Online, Scientific American Medicine, and Clinical Evidence. Participants could request additional information for any of the headlines, and the information was delivered via e-mail during their next synchronization. Participants completed a survey at the conclusion of the study to gauge their opinions about the service. RESULTS/OUTCOME: Of the 816 headlines delivered to the 16 study participants' PDAs during the project, Scientific American Medicine generated the highest proportion of headline requests at 35%. Most users of the PDA Alerts software reported that they learned about new medical developments sooner than they otherwise would have, and half reported that they learned about developments that they would not have heard about at all. While some users liked the PDA platform for receiving headlines, it seemed that a Web database that allowed tailored searches and alerts could be configured to satisfy both PDA-oriented and e-mail-oriented users.  相似文献   
110.
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