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   471篇
  免费   7篇
教育   359篇
科学研究   14篇
各国文化   13篇
体育   46篇
文化理论   7篇
信息传播   39篇
  2023年   2篇
  2022年   10篇
  2021年   12篇
  2020年   17篇
  2019年   25篇
  2018年   26篇
  2017年   28篇
  2016年   21篇
  2015年   11篇
  2014年   25篇
  2013年   85篇
  2012年   25篇
  2011年   23篇
  2010年   24篇
  2009年   16篇
  2008年   13篇
  2007年   19篇
  2006年   9篇
  2005年   9篇
  2004年   10篇
  2003年   9篇
  2002年   8篇
  2001年   7篇
  2000年   2篇
  1999年   4篇
  1998年   3篇
  1997年   5篇
  1996年   1篇
  1995年   2篇
  1994年   1篇
  1993年   2篇
  1991年   1篇
  1990年   4篇
  1989年   2篇
  1987年   2篇
  1986年   1篇
  1985年   2篇
  1984年   3篇
  1981年   1篇
  1978年   3篇
  1977年   1篇
  1976年   1篇
  1975年   2篇
  1971年   1篇
排序方式: 共有478条查询结果,搜索用时 15 毫秒
101.
102.
Interactions between public research organizations and industry can be conceptualized as having three main stages: drivers of interaction, channels of interaction, and the perceived benefits from collaboration. Both of the agents differ in terms of the incentives they have to collaborate and the behaviors they adopt during the collaboration process. Following a three-stage model based on Crépon et al. (1998), this paper discusses the impact of drivers of collaboration on channels of interaction, and the impact of these channels on the perceived benefits by researchers and firms. The methodology also allows firm-level benefits from interaction to be connected with researchers’ characteristics via the analysis of four common channels of interaction for firms and researchers. The study is based on original data collected through two surveys, carried out in Mexico during 2008, of R&D and product-development managers of firms and of academic researchers. Our results show that all channels of interaction play an important role in determining benefits; however, they differ in terms of their impact on short- or long-term benefits for firms. The channels related to joint and contract R&D, property rights, and human resources are the best, as they have a higher impact on long-term benefits for firms. Policy implications derived from this study focus on specific actions that enhance those researchers’ characteristics related to the best channels for fostering long-term benefits for firms.  相似文献   
103.
104.
105.
106.
107.
108.
There is a limited theoretical and empirical literature on the role of friendship quality and interracial contact on adolescent racial prejudice development. To address this gap, the present study examined the relationship between these factors amongst an Australian sample of 89 school-aged adolescent friendship dyads and 80 university-aged adolescent friendship dyads. All participants were administered questionnaires measuring prejudice towards Asian and Arab Australians, friendship quality and interracial contact. Overall, the results revealed that all adolescents reported significantly higher levels of subtle prejudice than blatant prejudice. As predicted, university-aged adolescents reported significantly lower levels of both subtle and blatant prejudice towards Asian and Arab Australians than school-aged adolescents. Importantly, adolescents who had contact with Asian (outgroup) friends reported significantly lower levels of subtle and blatant prejudice towards Asian Australians than adolescents with no Asian friends. Interestingly, friendship quality was not found to moderate the similarity of prejudice levels within friendship dyads. Together, these findings indicate that in developing subtle prejudice-reduction programs research should focus on increasing interracial cooperative contact, particularly amongst school-aged adolescents.  相似文献   
109.
This study is focused on the evaluation by μRaman mapping of the penetration depth achieved by ammonium oxalate treatment in different plaster specimens, a hot issue in the conservation field. The role of the carbonatic aggregate particles and the influence of the different variables of the treatment on the penetration depth and on the distribution of the newly-formed phase (whewellite) have been ascertained. Based on the results of μRaman mapping, analyses with Field Emission Scanning Electron Microscopy have been carried out in order to observe the whewellite crystals and the carbonatic aggregate particles involved in the reaction with ammonium oxalate.  相似文献   
110.
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