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   2171篇
  免费   25篇
教育   1669篇
科学研究   123篇
各国文化   20篇
体育   128篇
综合类   2篇
文化理论   27篇
信息传播   227篇
  2021年   18篇
  2020年   40篇
  2019年   54篇
  2018年   50篇
  2017年   69篇
  2016年   65篇
  2015年   40篇
  2014年   57篇
  2013年   568篇
  2012年   48篇
  2011年   60篇
  2010年   48篇
  2009年   43篇
  2008年   46篇
  2007年   51篇
  2006年   39篇
  2005年   42篇
  2004年   40篇
  2003年   28篇
  2002年   32篇
  2001年   21篇
  2000年   37篇
  1999年   35篇
  1998年   25篇
  1997年   25篇
  1996年   24篇
  1995年   24篇
  1994年   25篇
  1993年   28篇
  1992年   23篇
  1991年   25篇
  1990年   28篇
  1989年   28篇
  1988年   18篇
  1987年   17篇
  1986年   16篇
  1985年   28篇
  1984年   17篇
  1983年   20篇
  1982年   22篇
  1981年   15篇
  1980年   24篇
  1979年   21篇
  1978年   21篇
  1977年   14篇
  1976年   11篇
  1975年   17篇
  1973年   15篇
  1972年   10篇
  1940年   9篇
排序方式: 共有2196条查询结果,搜索用时 0 毫秒
181.
182.
Harry G. Johnson 《Minerva》1965,3(4):500-514
Summary There is no necessary connection between leadership in basic science and leadership in the applications of science, because scientific progress is a cooperative endeavour and not a competitive game; indeed, there may be a conflict between basic research and applied science. The notion of a position of leadership; in science raises questions of what leadership consists in and what its value is to the nation. The two main arguments for government support of science are cultural-social, and economic. The cultural-social argument stresses scientific activity as a form of social consumption of wealth and raises the question of whether other uses of the resources employed would contribute more to the greatness of the society. The economic argument stresses basic scientific research as a form of investment for the future, and raises the questions of what the rate of return on such investment is and whether and to what extent government support is called for. Relevant economic research results bearing on this problem are scarce. Economic theory suggests that competition in the market will supply less than the optimal amount of basic research; but our society substantially supplements the market through private contributions to and government support of science, and the question is whether this supplementation is deficient or excessive. Here difficult problems arise, on which more economic research is needed; one of these concerns the relative merits of government and private support of science. The rule-of-thumb procedures generally recommended for determining the volume and allocation of government support to basic scientific research generally ignore these problems, and amount to endorsing the present level of government support or recommending that it be increased. Allocation of federal support of science should take account of the possibility of stimulating the economic development of poor regions of the country by locating scientific research facilities in them.  相似文献   
183.
184.
185.
The design and development of the OCTANET system for networking among medical libraries in the midcontinental region is described. This system's features and configuration may be attributed, at least in part, to normal evolution of technology in library networking, remote access to computers, and development of machine-readable data bases. Current functions and services of the system are outlined and implications for future developments in computer-based networking are discussed.  相似文献   
186.
187.
A new free-standing library building, designed to integrate the collections serving interdisciplinary study in science and medicine, is described.  相似文献   
188.
189.
190.
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