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   756篇
  免费   15篇
教育   568篇
科学研究   56篇
各国文化   7篇
体育   57篇
综合类   2篇
文化理论   7篇
信息传播   74篇
  2023年   5篇
  2022年   7篇
  2021年   12篇
  2020年   19篇
  2019年   32篇
  2018年   28篇
  2017年   34篇
  2016年   37篇
  2015年   20篇
  2014年   32篇
  2013年   161篇
  2012年   25篇
  2011年   28篇
  2010年   15篇
  2009年   13篇
  2008年   14篇
  2007年   19篇
  2006年   18篇
  2005年   13篇
  2004年   18篇
  2003年   16篇
  2002年   12篇
  2001年   6篇
  2000年   13篇
  1999年   5篇
  1998年   6篇
  1997年   7篇
  1996年   14篇
  1995年   8篇
  1994年   7篇
  1993年   10篇
  1992年   4篇
  1991年   6篇
  1990年   4篇
  1989年   5篇
  1988年   7篇
  1987年   8篇
  1985年   3篇
  1984年   4篇
  1982年   5篇
  1981年   6篇
  1979年   3篇
  1978年   3篇
  1977年   6篇
  1975年   3篇
  1974年   3篇
  1973年   3篇
  1969年   3篇
  1968年   4篇
  1857年   3篇
排序方式: 共有771条查询结果,搜索用时 15 毫秒
1.
2.
This study investigates the perceived impact of election polls,focusing on the hotly contested 2000 U.S. presidential election.Survey data from 558 individuals gathered during the final daysof the election campaign are analyzed to examine beliefs thatthe polls greatly affect other voters, general views of pollsas good or bad for the country, beliefs about whether pollstersinfluence their results to come out a certain way, and supportfor banning election-night projections. Results indicate thatmost respondents felt the polls had no influence on themselveswhile still affecting others. Respondents exhibiting these ‘third-person-effect’perceptions were significantly more likely than others to believethat election polls are a bad thing for the country. Negativeperceptions of polls and beliefs that pollsters try to influenceresults were also related to general distrust of the news media.Negative views of polls in turn were associated with increasedsupport for prohibiting election-night projections. In general,the results illustrate the dependency of negative views aboutpolling on fears of untoward effects on voters, in particularthe fear that polls and election projections might lend supportto candidates opposed by the respondent.  相似文献   
3.
4.
The protective action of remote ischaemic preconditioning (RIPC) has been demonstrated in the context of surgical interventions in cardiology. Application of RIPC to sports performance has been proposed, but its effect on the electrocardiogram (ECG) during exercise remains unknown. This exploratory study aims to measure the changes in ventricular repolarization observed during exercise following RIPC in healthy subjects. In an experimental randomized crossover study, 17 subjects underwent two bouts of constant load exercise tests at 75% and 115% of gas exchange threshold (GET). Prior to exercise, they were allocated to either control or RIPC intervention with four cycles of 5?min of ischaemia followed by 5?min of reperfusion. ECG was continuously recorded during the protocol. QT and RR intervals were measured every 30?s (on an average tracing of the preceding 10?s). Although the time course of RR intervals did not differ between the two interventions (p?=?.56 at 75% GET and p?=?.74 at 115% GET), a significant shortening of QT intervals (measured from Q onset to T end) was observed during exercise (mean?±?standard deviation of RIPC vs. control: ?32?±?19?ms at 75% GET (p?p?p?p?相似文献   
5.
6.
7.
The purpose of this study was to examine the extent to which three teachers’ professional experience and existing orientations toward teaching and learning mathematics and science influenced their implementation of a project-based curriculum (i.e. project-based learning (PBL)). Data sources included interviews, videotapes of classroom activity, and a teaching philosophy questionnaire. Data analysis was conducted using an iterative coding technique. We found coherency between the teachers’ perceived orientations and their emergent ideas about PBL, their sense of PBL as being compatible with their goals, and the specific challenges with which they struggled. All the teachers wanted their students to be successful; however, different definitions of success led to quite different approaches toward teaching, and for the most part, these differences appeared to have occurred because of existing orientations the teachers held for teaching their discipline. Implications for professional development taking into account teachers’ orientations and thus their professional experience are discussed, as well as disciplinary challenges to using PBL.  相似文献   
8.
9.
The use of ‘play’ as a means of teaching elementary mathematics is discussed. The games used are described and the underlying theory explained. Results obtained from work with over 150 children are presented and the case for ‘Playway’ argued in the light of these.  相似文献   
10.
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