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   1060篇
  免费   16篇
  国内免费   1篇
教育   841篇
科学研究   47篇
各国文化   20篇
体育   61篇
文化理论   5篇
信息传播   103篇
  2022年   5篇
  2021年   6篇
  2020年   11篇
  2019年   17篇
  2018年   26篇
  2017年   34篇
  2016年   25篇
  2015年   17篇
  2014年   21篇
  2013年   240篇
  2012年   22篇
  2011年   23篇
  2010年   22篇
  2009年   24篇
  2008年   29篇
  2007年   29篇
  2006年   32篇
  2005年   27篇
  2004年   27篇
  2003年   19篇
  2002年   29篇
  2001年   26篇
  2000年   16篇
  1999年   22篇
  1998年   12篇
  1997年   11篇
  1996年   20篇
  1995年   16篇
  1994年   22篇
  1993年   18篇
  1992年   27篇
  1991年   20篇
  1990年   13篇
  1989年   19篇
  1988年   20篇
  1987年   10篇
  1986年   11篇
  1985年   9篇
  1984年   13篇
  1983年   5篇
  1982年   14篇
  1981年   3篇
  1980年   4篇
  1979年   9篇
  1978年   6篇
  1977年   13篇
  1976年   8篇
  1975年   4篇
  1974年   7篇
  1973年   6篇
排序方式: 共有1077条查询结果,搜索用时 31 毫秒
21.
ect cornerstone     
Wennberg  Hans-Erik  Powell  Gary C. 《TechTrends》2005,49(4):14-15
  相似文献   
22.
Experiment I compared constant (CI), variable-between (VBI), and variable-within (WVI) irrelevant cues during an extradimensional (ED) shift discrimination. Performance was better for CI than for VBI and better for VBI than for VWI. Experiment II combined CI, VBI, and VWI cues with ED or intradimensional (ID) shifts. Irrelevant-cue conditions did not affect ID performance but did affect ED performance. The typical superiority of ID, as compared to ED, shifts was observed in the VWI condition but not in the CI condition. Implications for mediating-response (i.e., attention or observing-response) theories were indicated.  相似文献   
23.
24.
To what extent do students and teachers hold similar beliefs about excellent teaching? Do differences in beliefs have practical implications (e.g., how students rate their teachers on end-of-semester evaluation forms)? In Study 1, undergraduate students (N=414) and faculty members (N=128) responded to questionnaires assessing their perceptions of an excellent discussion leader, lecturer, or instructor. Participants judged items that contributed to a Structure composite as more characteristic of excellent lecturers than excellent discussion leaders and items that contributed to a Process composite as more characteristic of excellent discussion leaders than excellent lecturers. Results for students and teachers showed several systematic differences. In Study 2,278 students and their course teachers rated the characteristics of a hypothetical excellent lecturer. In addition, students rated the effectiveness of their individual teachers. Students’ ratings of their teachers were higher when students and teachers agreed on their perceptions of characteristics of excellent lecturers.  相似文献   
25.
Median based smoothing algorithms have received considerable attention in the last few years. Their properties make them sometimes superior to linear smoothers. In this paper we develop an expression for the bivariate distribution of a median- smoothed Markov chain and we illustrate one application of it by comparing the power spectra of the input and the output of a median smoother when the input is binary valued.  相似文献   
26.
In this paper, we focus on the potential innovative benefits to corporate venture capital (CVC), i.e. equity investments in entrepreneurial ventures by incumbent firms. We propose that corporate venture capital programs may be instrumental in harvesting innovations from entrepreneurial ventures and thus an important part of a firm's overall innovation strategy. We hypothesize that these programs are especially effective in weak intellectual property (IP) regimes and when the firm has sufficient absorptive capacity. We analyze a large panel of public firms over a 20-year period and find that increases in corporate venture capital investments are associated with subsequent increases in firm patenting.  相似文献   
27.
In an effort to provide high-quality preschool education, policymakers are increasingly requiring public preschool teachers to have at least a Bachelor's degree, preferably in early childhood education. Seven major studies of early care and education were used to predict classroom quality and children's academic outcomes from the educational attainment and major of teachers of 4-year-olds. The findings indicate largely null or contradictory associations, indicating that policies focused solely on increasing teachers' education will not suffice for improving classroom quality or maximizing children's academic gains. Instead, raising the effectiveness of early childhood education likely will require a broad range of professional development activities and supports targeted toward teachers' interactions with children.  相似文献   
28.
29.
30.
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