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   23565篇
  免费   382篇
  国内免费   21篇
教育   16652篇
科学研究   2314篇
各国文化   324篇
体育   1840篇
综合类   22篇
文化理论   317篇
信息传播   2499篇
  2022年   146篇
  2021年   229篇
  2020年   378篇
  2019年   531篇
  2018年   782篇
  2017年   818篇
  2016年   753篇
  2015年   534篇
  2014年   673篇
  2013年   4399篇
  2012年   626篇
  2011年   597篇
  2010年   551篇
  2009年   498篇
  2008年   604篇
  2007年   541篇
  2006年   507篇
  2005年   458篇
  2004年   448篇
  2003年   431篇
  2002年   432篇
  2001年   461篇
  2000年   485篇
  1999年   383篇
  1998年   265篇
  1997年   307篇
  1996年   309篇
  1995年   269篇
  1994年   263篇
  1993年   236篇
  1992年   318篇
  1991年   298篇
  1990年   337篇
  1989年   311篇
  1988年   278篇
  1987年   276篇
  1986年   248篇
  1985年   297篇
  1984年   230篇
  1983年   220篇
  1982年   204篇
  1981年   201篇
  1980年   208篇
  1979年   254篇
  1978年   190篇
  1977年   165篇
  1976年   148篇
  1975年   139篇
  1974年   141篇
  1973年   127篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
31.
32.
33.
34.
35.
This study examined the cost and performance of six commercial document suppliers accessible via OCLC, and comapared their service to that of traditional interlibrary loan (ILL). Results indicated that, while commercial firms cannot be recommended as a wholesale replacement for ILL, they can add much-needed flexibility to a library's overall plan for document delivery.  相似文献   
36.
The authors report on a self‐completed questionnaire study from a North Yorkshire based general practice regarding the information needs of its clinicians. The work was carried out with a particular focus on the practice library, and the findings identified that a new approach to maintaining and developing the library was needed. The literature regarding the information needs of primary care clinicians and the role of practice libraries is considered, and compared to those of the clinicians at the practice. Discussion follows on how a collaborative project was set up between the practice and a librarian based at the local NHS Trust library in order to improve the existing practice library. Difficulties encountered and issues unique to the project are explored, including training implications presented by the implementation of electronic resources. Marketing activities implemented are discussed, how the library will operate in its new capacity, and how ongoing support and maintenance of the library will be carried out. It is concluded that although scepticism still exists regarding librarian involvement in practice libraries, collaboration between clinicians and librarians is an effective approach to the successful development and maintenance of a practice library, and recommendations are therefore made for similar collaborative work.  相似文献   
37.
Collaboration in research activity is now the rule not the exception. It is encouraged by government, funding bodies and research councils. However, the concept of collaboration is difficult to define. It occurs at many different levels, driven by a complex research system-policy dynamic. Three different models of collaboration – inter-personal, team and corporate – are identified, each with their own rationale, structure, benefits and costs. The paper examines the institutional implications of these models. It argues that institutions and individual researchers conceptualise and operationalise research collaboration in different ways. Although vital to institutional mission, collaborative research is rarely mapped by senior managers with any precision. In general, institutional approaches to the management of collaborative research lag behind the policy rhetoric. The paper concludes with an overview of the key dilemmas for institutional strategists and policy makers posed by the shift towards more collaborative approaches to research.  相似文献   
38.
39.
40.
Looking for laws     
S. French 《Metascience》2006,15(3):437-469
  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