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   1395篇
  免费   12篇
  国内免费   1篇
教育   1116篇
科学研究   75篇
各国文化   14篇
体育   78篇
综合类   1篇
文化理论   9篇
信息传播   115篇
  2020年   8篇
  2019年   25篇
  2018年   32篇
  2017年   37篇
  2016年   32篇
  2015年   22篇
  2014年   23篇
  2013年   555篇
  2012年   23篇
  2011年   25篇
  2010年   9篇
  2009年   20篇
  2008年   19篇
  2007年   13篇
  2006年   24篇
  2005年   20篇
  2004年   18篇
  2003年   15篇
  2002年   9篇
  2001年   23篇
  2000年   9篇
  1999年   12篇
  1998年   9篇
  1997年   15篇
  1996年   20篇
  1995年   9篇
  1994年   12篇
  1993年   23篇
  1992年   20篇
  1991年   24篇
  1990年   13篇
  1989年   23篇
  1988年   17篇
  1987年   7篇
  1986年   11篇
  1985年   16篇
  1984年   10篇
  1983年   8篇
  1982年   8篇
  1981年   10篇
  1980年   14篇
  1979年   6篇
  1978年   10篇
  1977年   8篇
  1976年   12篇
  1974年   11篇
  1973年   8篇
  1969年   10篇
  1968年   12篇
  1967年   11篇
排序方式: 共有1408条查询结果,搜索用时 15 毫秒
981.
982.
983.
984.
985.
986.
987.
In this paper we examine how incentives for collaboration shape collaborative behavior and researcher productivity in the context of EU-funded research networks. EU-funded research networks require researchers to collaborate as a condition for securing research funding. The presence of research funding, therefore, may influence collaborative behavior. Our approach involves isolating the effects of funding, collaboration and previous collaborations (prior to funding) on research output, and examining how the pattern of collaboration affects research productivity over time. Employing a panel of 294 researchers in 39 EU research networks over a 15-year period we find that while the impact of funding on productivity is generally positive the overall impact of collaboration within the funded networks is weak. When we delineate between pre-, during- and post-funding periods, however, we find some important differences. During the period of funding, collaboration did not lead to an increase in research production. In the post-funding period we find that although the number of collaborations decreases within the network, the impact of collaboration on productivity is positive and significant. Our findings suggest that collaborations formed to capitalize on funding opportunities, while not effective in enhancing researcher productivity in the short run, may be an important promoter of effective collaborations in the longer run.  相似文献   
988.
The ageing society poses significant challenges to Europe’s economy and society. In coming to grips with these issues, we must be aware of their ethical dimensions. Values are the heart of the European Union, as Article 1a of the Lisbon Treaty makes clear: “The Union is founded on the values of respect for human dignity…”. The notion of Europe as a community of values has various important implications, including the development of inclusion policies. A special case of exclusion concerns the gap between those people with effective access to digital and information technology and those without access to it, the “digital divide”, which in Europe is chiefly age-related. Policies to overcome the digital divide and, more generally speaking, e-inclusion policies addressing the ageing population raise some ethical problems. Among younger senior citizens, say those between 65 and 80 years old, the main issues are likely to be universal access to ICT and e-participation. Among the older senior citizens, say those more than 80 years old, the main issues are mental and physical deterioration and assistive technology. An approach geared towards the protection of human rights could match the different needs of senior citizens and provide concrete guidance to evaluate information technologies for them.  相似文献   
989.
In this study, a wiki was integrated into a professional development model that systemically addresses early-career teachers?? needs. This study was conducted to examine the impact of wiki-based professional development activities in a scientist-teacher professional learning community and focused on early-career teachers?? perceptions of the role of wiki technology and knowledge of teaching through inquiry. Teachers participated in the Professional Learning Community Model for Entry into Teaching Science (PLC-METS), a professional development program that is based on an integrated teacher education model of knowledge sharing, collaboration, and communication between teachers and scientists, with the goal of supporting early-career teachers?? ability to engage their students in scientific inquiry. The use of a wiki environment to collaborate on activities, deliver resources, and share knowledge is rapidly expanding in professional development communities. The use of the wiki in PLC-METS positively predicted the results of teachers?? knowledge of inquiry-based teaching. Results demonstrate that the wiki can contribute to building a learning community for collaboration between early-career science teachers and scientists. The paper also discusses the educational implications for the design of wiki-based professional learning communities that impact teachers?? professional development.  相似文献   
990.
The importance of proximal-to-distal sequencing in human performance throwing has been reported previously. However, a comprehensive comparison of the proximal-to-distal sequence in team-handball throwing in athletes with different training experience and competition is lacking. Therefore, the aim of the study was to compare the ball velocity and proximal-to-distal sequence in the team-handball standing throw with run-up of players of different skill (less experienced, experienced, and elite). Twenty-four male team-handball players (n = 8 for each group) performed five standing throws with run-up with maximal ball velocity and accuracy. Kinematics and ball trajectories were recorded with a Vicon motion capture system and joint movements were calculated. A specific proximal-to-distal sequence, where elbow flexion occurred before shoulder internal rotation, was found in all three groups. These results are in line with previous studies in team-handball. Furthermore, the results of the present study suggest that in the team-handball standing throw with run-up, increased playing experience is associated with an increase in ball velocity as well as a delayed start to trunk flexion.  相似文献   
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