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   40948篇
  免费   507篇
  国内免费   21篇
教育   29876篇
科学研究   3616篇
各国文化   339篇
体育   2818篇
综合类   15篇
文化理论   677篇
信息传播   4135篇
  2022年   191篇
  2021年   328篇
  2020年   514篇
  2019年   797篇
  2018年   3112篇
  2017年   3044篇
  2016年   2479篇
  2015年   752篇
  2014年   982篇
  2013年   6179篇
  2012年   1057篇
  2011年   1556篇
  2010年   1485篇
  2009年   1063篇
  2008年   1396篇
  2007年   1793篇
  2006年   678篇
  2005年   956篇
  2004年   951篇
  2003年   882篇
  2002年   624篇
  2001年   603篇
  2000年   526篇
  1999年   464篇
  1998年   303篇
  1997年   301篇
  1996年   308篇
  1995年   325篇
  1994年   261篇
  1993年   261篇
  1992年   386篇
  1991年   371篇
  1990年   375篇
  1989年   358篇
  1988年   309篇
  1987年   345篇
  1986年   307篇
  1985年   351篇
  1984年   286篇
  1983年   262篇
  1982年   238篇
  1981年   220篇
  1980年   200篇
  1979年   300篇
  1978年   215篇
  1977年   192篇
  1976年   185篇
  1975年   167篇
  1974年   163篇
  1971年   138篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
52.
53.
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   
54.
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   
55.
In recent years university presses have undergone some significant changes, such as expansion of their scope to include materials that may have appeal beyond the scholarly market. This article investigates, through the use of a survey of university libraries, the acquisition of university press products by libraries. In general, recent years have been changes in the relationship between university presses and libraries that have resulted in fewer items being purchased by the libraries.  相似文献   
56.
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   
57.
58.
The introduction to this article discusses a dilemma facing many Third World countries: should they place computers in their schools and, if so, for what purposes? The author outlines four common rationales—the Social, Vocational, Pedagogical and Catalytic—and refers to two less common ones—the Information Technology Industry and Cost-effectiveness Rationales. The main text describes policy in China at national level, and analyses policy and practice in Beijing City and Zhejiang Province. The paper is based on an international co-operative study of computers in African, Asian and Arabic- speaking schools, funded by the Harold Macmillan Trust.  相似文献   
59.
60.
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