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   8178篇
  免费   115篇
  国内免费   26篇
教育   5410篇
科学研究   1048篇
各国文化   45篇
体育   645篇
综合类   13篇
文化理论   75篇
信息传播   1083篇
  2022年   53篇
  2021年   65篇
  2020年   128篇
  2019年   175篇
  2018年   259篇
  2017年   336篇
  2016年   274篇
  2015年   195篇
  2014年   250篇
  2013年   1291篇
  2012年   232篇
  2011年   266篇
  2010年   222篇
  2009年   181篇
  2008年   180篇
  2007年   229篇
  2006年   155篇
  2005年   147篇
  2004年   145篇
  2003年   134篇
  2002年   113篇
  2001年   185篇
  2000年   193篇
  1999年   146篇
  1998年   119篇
  1997年   100篇
  1996年   111篇
  1995年   60篇
  1994年   77篇
  1993年   52篇
  1992年   119篇
  1991年   110篇
  1990年   89篇
  1989年   98篇
  1988年   107篇
  1987年   88篇
  1986年   110篇
  1985年   106篇
  1984年   89篇
  1983年   90篇
  1982年   84篇
  1981年   61篇
  1979年   81篇
  1978年   78篇
  1977年   57篇
  1976年   57篇
  1974年   54篇
  1973年   45篇
  1972年   49篇
  1971年   46篇
排序方式: 共有8319条查询结果,搜索用时 46 毫秒
21.
Editorial     
N Mukunda 《Resonance》1996,1(4):1-1
  相似文献   
22.
23.
24.
The Alfred Taubman Medical Library at the University of Michigan has offered instruction in online literature searching to third-year pharmacy students as a component of the course "Drug Information and Scientific Literature Evaluation" since 1983. In the spring of 1989, a follow-up study was conducted to assess the impact of instruction on four classes of graduates. Of a pool of 151 graduates, 90 (60%) responded to a mailed questionnaire on their use of information and computerized literature searching. The respondents were divided into four subgroups: end-user searchers, users of intermediaries, end users who used intermediaries, and those who did not use computerized literature search systems. Seventy-two percent of the respondents used some type of computerized literature searching, and 42% performed their own searches. The four subgroups differed in general computer use, familiarity with MEDLINE search terminology, information use, reasons for using or not using literature searching, and characteristics of searches (i.e., type, time frame, amount, and frequency). Training in end-user search systems appears to have had an impact on the continued use of computerized literature searching several years after the formal educational program.  相似文献   
25.
The National Library of Medicine has had an enormous impact on health information services all over the world. Although NLM is primarily a national institution, it has become an important international resource by responding to requests from the international community. NLM has been influential in three major ways. First, NLM has provided a model for other national and regional health information services. Second, it has been a catalyst, in that MEDLARS and other services it provides formed the nucleus of many regional networks. NLM helped such networks get started by giving advice on how to set up services and build collections and by "training the trainers" on the MEDLARS system. Third, NLM has supported national and regional operations by providing the additional training and materials needed for day-to-day service.  相似文献   
26.
Questions concerning some of the values we hold as librarians and the goals, standards, and other evaluation tools we derive from them are discussed in the context of the history of our profession and the present period of rapid change. The concepts of stable and changing paradigms and of "scientific communities" provide the foundation for consideration of how a changing conceptual framework can affect values and their application in the evaluation process. One of many possible scenarios for the future is briefly outlined to demonstrate how some traditional values may fare.  相似文献   
27.
28.
29.
30.
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