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   38048篇
  免费   547篇
  国内免费   54篇
教育   26695篇
科学研究   4292篇
各国文化   390篇
体育   2817篇
综合类   39篇
文化理论   313篇
信息传播   4103篇
  2021年   350篇
  2020年   562篇
  2019年   830篇
  2018年   1082篇
  2017年   1162篇
  2016年   1065篇
  2015年   666篇
  2014年   891篇
  2013年   7460篇
  2012年   860篇
  2011年   925篇
  2010年   754篇
  2009年   726篇
  2008年   807篇
  2007年   784篇
  2006年   668篇
  2005年   634篇
  2004年   588篇
  2003年   542篇
  2002年   594篇
  2001年   643篇
  2000年   641篇
  1999年   610篇
  1998年   337篇
  1997年   366篇
  1996年   413篇
  1995年   345篇
  1994年   360篇
  1993年   342篇
  1992年   490篇
  1991年   513篇
  1990年   514篇
  1989年   517篇
  1988年   437篇
  1987年   415篇
  1986年   441篇
  1985年   521篇
  1984年   438篇
  1983年   422篇
  1982年   356篇
  1981年   342篇
  1980年   316篇
  1979年   425篇
  1978年   388篇
  1977年   333篇
  1976年   289篇
  1975年   227篇
  1974年   243篇
  1973年   256篇
  1971年   226篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
111.
112.
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   
113.
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   
114.
115.
116.
117.
"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   
118.
119.
This article reports the results of a survey of literature on measures of library effectiveness. This survey led to the formulation of six criterion concepts (accessibility, cost, user satisfaction, response time, cost/benefit ratio, and use). The advantages and disadvantages of each method of measurement are discussed. Several points which became clear during the analysis are discussed. First, there is a relative lack of concern with the rationale behind the evaluation process, although the results invariably lead to a confused interpretation when there is no clear understanding of the purpose of an evaluation. Second, the total library system is rarely considered; instead, each evaluation criterion is taken in isolation rather than as part of the whole. Third, the library's preservation function has not been considered at all.  相似文献   
120.
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