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   3589篇
  免费   54篇
  国内免费   7篇
教育   2627篇
科学研究   337篇
各国文化   44篇
体育   246篇
综合类   1篇
文化理论   47篇
信息传播   348篇
  2022年   21篇
  2021年   35篇
  2020年   69篇
  2019年   100篇
  2018年   129篇
  2017年   140篇
  2016年   111篇
  2015年   89篇
  2014年   84篇
  2013年   898篇
  2012年   87篇
  2011年   90篇
  2010年   64篇
  2009年   67篇
  2008年   82篇
  2007年   64篇
  2006年   62篇
  2005年   54篇
  2004年   59篇
  2003年   45篇
  2002年   62篇
  2001年   34篇
  2000年   48篇
  1999年   38篇
  1998年   33篇
  1997年   44篇
  1996年   49篇
  1995年   39篇
  1994年   39篇
  1993年   39篇
  1992年   31篇
  1991年   25篇
  1990年   30篇
  1989年   39篇
  1988年   31篇
  1987年   30篇
  1986年   27篇
  1985年   18篇
  1984年   28篇
  1983年   28篇
  1982年   27篇
  1981年   30篇
  1980年   31篇
  1979年   26篇
  1978年   31篇
  1976年   20篇
  1974年   22篇
  1973年   18篇
  1971年   21篇
  1967年   18篇
排序方式: 共有3650条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
6.
7.
Governments worldwide are increasingly using Web-based business models to enhance their service delivery. Yet the concept of the business model is unexplored within the context of e-government. Drawing upon the literature on e-commerce, we develop a taxonomy for analyzing Web-based business models for e-government. Based on a systematic survey of 59 e-government Web sites in the Netherlands, our findings indicate that most of the Web sites use the content provider or direct-to-customer business models, while only a few are using novel business models. Overall, the concept of business model is appealing and useful in the public sector. Specifically it compliments research on Web site quality by analyzing and describing Web sites using atomic e-government business models and suggesting improvements by using combinations of business models.  相似文献   
8.
Academic libraries and consortia are spending the vast majority of their material budgets on digital content, including ebooks. A review of ebook preservation activities for the North American library consortia is provided along with a look at the major preservation services such as Portico, CLOCKSS and HathiTrust. Publishers and ebook aggregators are also examined to provide a broad environmental scan of the current ebook preservation activities and risks.  相似文献   
9.
Academic libraries have to a large extent taken the lead in facilitating new approaches to research data management, but changes to the research data landscape have had an impact on numerous areas of academic work, including ethics review. Using interpretive phenomenological analysis of interviews with chairs of Canadian research ethics boards, this study explores how ethics review boards have experienced changes to data policy and related technologies in order to describe the ethical implications of new approaches to data management and to explore ways in which the library, ethics review boards, and other campus partners might harmonize efforts to support emerging data practices. While ethics review boards in Canada are keenly aware of open data policies, data publishing in practice is still nascent. There is uncertainty about the adoption of changing technologies for research and their impacts on privacy protection. Where responsibility lies for addressing these uncertainties is often unclear. Academic libraries and research ethics boards are well-suited to engage in mutual knowledge transfer and to integrate data management planning and ethics review processes. Institutional-level oversight that includes all campus departments impacted by changes to the research data landscape may facilitate improved communication and reduce role ambiguity.  相似文献   
10.
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