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   18669篇
  免费   287篇
  国内免费   54篇
教育   13961篇
科学研究   1198篇
各国文化   204篇
体育   1253篇
综合类   44篇
文化理论   87篇
信息传播   2263篇
  2022年   112篇
  2021年   214篇
  2020年   290篇
  2019年   425篇
  2018年   606篇
  2017年   634篇
  2016年   588篇
  2015年   381篇
  2014年   537篇
  2013年   3836篇
  2012年   503篇
  2011年   513篇
  2010年   454篇
  2009年   445篇
  2008年   467篇
  2007年   436篇
  2006年   472篇
  2005年   414篇
  2004年   304篇
  2003年   266篇
  2002年   258篇
  2001年   387篇
  2000年   299篇
  1999年   276篇
  1998年   180篇
  1997年   177篇
  1996年   198篇
  1995年   155篇
  1994年   172篇
  1993年   150篇
  1992年   224篇
  1991年   218篇
  1990年   248篇
  1989年   219篇
  1988年   181篇
  1987年   194篇
  1986年   195篇
  1985年   188篇
  1984年   189篇
  1983年   174篇
  1982年   146篇
  1981年   141篇
  1980年   137篇
  1979年   203篇
  1978年   165篇
  1977年   124篇
  1976年   125篇
  1975年   118篇
  1973年   109篇
  1971年   117篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
72.
This paper describes the procedures used at the Library of the College of Physicians of Philadelphia to divide its ninety-year-old dictionary card catalog. The division was necessitated by overcrowding, obsolete subject headings, and lack of a complete authority list which resulted in like materials being scattered throughout the catalog under several headings. Two catalogs were created: the historical-biographical catalog, representing all works published before 1950 and all works of historical or biographical nature; and the current catalog, containing all works published from 1950 on, excepting historical or biographical materials. The 1950- catalog was further divided into name and subject catalogs, and the subject section was revised according to MeSH. The project was completed in about two years. As a result, searching time has been much reduced, and the library is able to take advantage of the annual revisions of MeSH to update the subject catalog.  相似文献   
73.
介绍国外权威文献传递服务机构   总被引:4,自引:0,他引:4  
目前网上文献传递服务在各大图书馆和情报机构都有一定的发展。本文主要从文献传递的特点、文献收藏、服务情况、服务周期、服务对象和服务费用等方面对国外几家较著名的网上文献情报机构进行介绍,以期对我们的文献传递服务工作提供帮助和参考。  相似文献   
74.
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   
75.
76.
77.
OBJECTIVES: The purpose of this study is to determine how personal digital assistants (PDAs) are used on an academic health sciences campus to define the level of training and support the library can provide to the students and faculty. METHOD: A Web-based questionnaire was developed. A total of 1,538 health sciences faculty and residents were sent an email message requesting participation. Data from the returned surveys were analyzed with SPSS. RESULTS: Sixty-one percent of survey respondents used PDAs. The address book, date book, and calculator were the most common uses reported for PDAs. Residents also reported a high use of drug databases on their PDAs. Most survey respondents indicated they would like to learn more about clinical resources for PDAs. CONCLUSIONS: Many opportunities exist for librarians to provide training and support for PDAs, in addition to evaluation and promotion of clinical software for PDAs.  相似文献   
78.
79.
The author, a professor at the University of Toronto, touches briefly on the extensive and rich archival literature that supports the teaching of macroappraisal, but notes that this is not the only educational material she offers her students when teaching appraisal theory. She discusses the usefulness to archivists of literature from the fields of ethnography, organizational knowing, records in history, personal documentary behaviour, memory, and communications, noting that the use of texts from these fields can encourage students to reflect on their own presumptions and to develop a taste for the wide reading and research that must support appraisal.  相似文献   
80.
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