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   18530篇
  免费   250篇
  国内免费   125篇
教育   12564篇
科学研究   2426篇
各国文化   126篇
体育   1577篇
综合类   17篇
文化理论   154篇
信息传播   2041篇
  2020年   246篇
  2019年   357篇
  2018年   524篇
  2017年   515篇
  2016年   509篇
  2015年   319篇
  2014年   413篇
  2013年   3106篇
  2012年   408篇
  2011年   469篇
  2010年   343篇
  2009年   320篇
  2008年   324篇
  2007年   387篇
  2006年   329篇
  2005年   323篇
  2004年   300篇
  2003年   302篇
  2002年   285篇
  2001年   328篇
  2000年   332篇
  1999年   320篇
  1998年   193篇
  1997年   186篇
  1996年   229篇
  1995年   189篇
  1994年   162篇
  1993年   161篇
  1992年   251篇
  1991年   263篇
  1990年   258篇
  1989年   290篇
  1988年   242篇
  1987年   252篇
  1986年   248篇
  1985年   287篇
  1984年   253篇
  1983年   231篇
  1982年   207篇
  1981年   190篇
  1980年   172篇
  1979年   273篇
  1978年   217篇
  1977年   198篇
  1976年   163篇
  1975年   146篇
  1974年   170篇
  1973年   143篇
  1972年   130篇
  1971年   135篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
52.
53.
54.
55.
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   
56.
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   
57.
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   
58.
59.
60.
"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