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   2751篇
  免费   5篇
  国内免费   1篇
教育   2008篇
科学研究   413篇
各国文化   2篇
体育   61篇
综合类   6篇
文化理论   57篇
信息传播   210篇
  2022年   1篇
  2021年   2篇
  2020年   3篇
  2019年   4篇
  2018年   65篇
  2017年   107篇
  2016年   166篇
  2015年   67篇
  2014年   32篇
  2013年   43篇
  2012年   56篇
  2011年   173篇
  2010年   80篇
  2009年   125篇
  2008年   46篇
  2007年   37篇
  2006年   57篇
  2005年   689篇
  2004年   541篇
  2003年   288篇
  2002年   82篇
  2001年   42篇
  2000年   27篇
  1999年   5篇
  1998年   2篇
  1996年   1篇
  1995年   1篇
  1994年   1篇
  1993年   1篇
  1991年   1篇
  1990年   1篇
  1984年   2篇
  1979年   2篇
  1977年   6篇
  1934年   1篇
排序方式: 共有2757条查询结果,搜索用时 31 毫秒
71.
In many Western science systems, funding structures increasingly stimulate academic research to contribute to practical applications, but at the same time the rise of bibliometric performance assessments have strengthened the pressure on academics to conduct excellent basic research that can be published in scholarly literature. We analyze the interplay between these two developments in a set of three case studies of fields of chemistry in the Netherlands. First, we describe how the conditions under which academic chemists work have changed since 1975. Second, we investigate whether practical applications have become a source of credibility for individual researchers. Indeed, this turns out to be the case in catalysis, where connecting with industrial applications helps in many steps of the credibility cycle. Practical applications yield much less credibility in environmental chemistry, where application-oriented research agendas help to acquire funding, but not to publish prestigious papers or to earn peer recognition. In biochemistry practical applications hardly help in gaining credibility, as this field is still strongly oriented at fundamental questions. The differences between the fields can be explained by the presence or absence of powerful upstream end-users, who can afford to invest in academic research with promising long term benefits.  相似文献   
72.
73.
74.
75.
76.
What happens when a government cannot meet its obligation to provide universal primary education and enhance the quality of education for all of its citizens? The present study examines the interactions among stakeholders in the user-fee policy in primary education in Kenya. It seeks to show how this policy has affected attendance rates and drop-out rates among elementary schoolchildren. It reveals that, in addition to limiting access and contributing to attrition, user-fees significantly contribute to absenteeism. The study also exposes the dire situation of economically vulnerable citizens who do not have the resources which they need to ensure private education for their children. It concludes that together the government and household-level economic weaknesses have made it virtually impossible to attain the goal of education for all in Kenya.  相似文献   
77.
78.
79.
80.
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