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   1984篇
  免费   31篇
  国内免费   3篇
教育   1619篇
科学研究   58篇
各国文化   29篇
体育   141篇
文化理论   29篇
信息传播   142篇
  2022年   12篇
  2021年   21篇
  2020年   18篇
  2019年   54篇
  2018年   72篇
  2017年   88篇
  2016年   63篇
  2015年   51篇
  2014年   56篇
  2013年   435篇
  2012年   50篇
  2011年   63篇
  2010年   43篇
  2009年   61篇
  2008年   68篇
  2007年   48篇
  2006年   44篇
  2005年   34篇
  2004年   43篇
  2003年   27篇
  2002年   42篇
  2001年   35篇
  2000年   32篇
  1999年   20篇
  1998年   28篇
  1997年   27篇
  1996年   29篇
  1995年   20篇
  1994年   21篇
  1993年   18篇
  1992年   14篇
  1991年   15篇
  1990年   21篇
  1989年   18篇
  1988年   15篇
  1987年   15篇
  1986年   22篇
  1985年   17篇
  1984年   14篇
  1983年   15篇
  1982年   16篇
  1981年   19篇
  1980年   16篇
  1979年   26篇
  1978年   21篇
  1977年   24篇
  1976年   16篇
  1975年   9篇
  1974年   11篇
  1973年   10篇
排序方式: 共有2018条查询结果,搜索用时 31 毫秒
41.
Using a unique database on Swedish patents owned by small firms and individuals, survival models estimate how different factors influence the decision to commercialize the patents. Such an analysis has seemingly never previously been undertaken. Since the owners know more about the patents than potential external financiers, problems related to asymmetrical information are present. To overcome these problems when inventors and small technology-based firms need financing, Sweden has for a long time relied on government support rather than private venture capital firms. The empirical results show that the larger is the share of patent-owners’ costs covered by government financial support during the R&D phase, the lower is the probability of patents being commercialized. This lower degree of commercialization is likely to depend on (1) the soft terms of the government loans, where the patent owner can avoid paying back the loan if the patent is never commercialized and/or (2) that the government is not able to select promising projects. The first explanation is related to moral hazard and the second one to adverse selection. The policy suggestion is for government to change the design of the loans, to base them on firms rather than projects.  相似文献   
42.
This longitudinal study of 105 economically disadvantaged children examined the relation between reading problems and internalizing behavior in 3rd- and 5th-grade assessments (8- to 12-year olds). The variable-centered results showed that reading problems predicted change in internalizing behavior in the context of child and family predictors. The person-centered results showed that children with reading problems in both grades had higher internalizing scores in 5th grade but not in 3rd grade than children with reading problems in 3rd grade or no problems. Child-reported negative emotion experiences varied similarly across grade. The results tie reading problems to emotional distress in school and support conclusions about the direction of effects and the internalization of academic difficulty for disadvantaged children.  相似文献   
43.
This study provides an expanded view of joint attention and its relation to expressive language development. A total of 144 toddlers (40 typically developing, 58 with autism spectrum disorder [ASD], 46 with developmental delay [DD]) participated at 24 and 31 months. Toddlers who screened positive for ASD risk, especially those subsequently diagnosed with ASD, had poorer joint attention skills, joint engagement during parent–toddler interaction, and expressive language. Findings highlight the dynamic relation between joint attention and language development. In the ASD and DD groups, joint engagement predicted later expressive vocabulary, significantly more than predictions based on joint attention skills. Joint engagement was most severely impacted when toddlers did not talk initially and improved markedly if they subsequently began to speak.  相似文献   
44.
Given US students’ lack of international competitiveness in mathematics and science, many states have adopted the Common Core State Standards for Mathematics (CCSSM). To help ensure that the Standards for Mathematical Practice within the CCSSM and effective teaching practices are implemented appropriately, many teachers are emerging as teacher leaders with the intent of supporting teachers with this implementation. Unfortunately, not all of these teachers are necessarily prepared in the field of teacher leadership. Recognizing the importance of having well-prepared teacher leaders, this article describes the case of Ms. Hodges, as she transitioned from mathematics teacher to teacher leader. Data revealed that several factors affected Ms. Hodges’ transition, some positively and others negatively. These results as well as implications for teacher leader development are provided.  相似文献   
45.
46.
47.
48.
49.
50.
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