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   30011篇
  免费   436篇
  国内免费   129篇
教育   21069篇
科学研究   3380篇
各国文化   336篇
体育   2337篇
综合类   15篇
文化理论   292篇
信息传播   3147篇
  2021年   241篇
  2020年   425篇
  2019年   633篇
  2018年   871篇
  2017年   814篇
  2016年   796篇
  2015年   547篇
  2014年   670篇
  2013年   5635篇
  2012年   634篇
  2011年   680篇
  2010年   565篇
  2009年   537篇
  2008年   637篇
  2007年   583篇
  2006年   562篇
  2005年   547篇
  2004年   504篇
  2003年   515篇
  2002年   478篇
  2001年   491篇
  2000年   494篇
  1999年   469篇
  1998年   304篇
  1997年   307篇
  1996年   373篇
  1995年   341篇
  1994年   292篇
  1993年   303篇
  1992年   406篇
  1991年   419篇
  1990年   416篇
  1989年   418篇
  1988年   364篇
  1987年   372篇
  1986年   360篇
  1985年   410篇
  1984年   350篇
  1983年   361篇
  1982年   318篇
  1981年   297篇
  1980年   294篇
  1979年   397篇
  1978年   316篇
  1977年   288篇
  1976年   265篇
  1975年   220篇
  1974年   240篇
  1973年   212篇
  1971年   193篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.
93.
94.
95.
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   
96.
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   
97.
98.
99.
100.
"Change" is a critical dimension of contemporary experience. Library associations are not exempt, and they change in ways similar to other organizations. According to some authorities, four phases typify the process: diagnosis, design, implementation, and incorporation. Focusing on changes in the Medical Library Association's longstanding program of continuing education, the authors utilize the "phase framework" to chart that association's movement from a management system depending primarily upon volunteers to one in which professional staff figure prominently. The historical review serves a heuristic purpose for individuals and institutions in identifying characteristic features of the change process.  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