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   502篇
  免费   6篇
教育   377篇
科学研究   32篇
各国文化   2篇
体育   49篇
文化理论   3篇
信息传播   45篇
  2023年   5篇
  2022年   3篇
  2021年   7篇
  2020年   16篇
  2019年   14篇
  2018年   16篇
  2017年   32篇
  2016年   15篇
  2015年   15篇
  2014年   14篇
  2013年   124篇
  2012年   7篇
  2011年   11篇
  2010年   9篇
  2009年   7篇
  2008年   7篇
  2007年   15篇
  2006年   12篇
  2005年   8篇
  2004年   13篇
  2003年   9篇
  2002年   9篇
  2001年   7篇
  2000年   5篇
  1999年   13篇
  1998年   6篇
  1997年   3篇
  1996年   3篇
  1995年   4篇
  1994年   2篇
  1993年   6篇
  1992年   7篇
  1991年   4篇
  1990年   4篇
  1988年   6篇
  1987年   5篇
  1986年   4篇
  1985年   3篇
  1984年   3篇
  1983年   3篇
  1982年   6篇
  1981年   5篇
  1980年   7篇
  1979年   8篇
  1978年   4篇
  1976年   3篇
  1975年   2篇
  1970年   2篇
  1919年   2篇
  1866年   1篇
排序方式: 共有508条查询结果,搜索用时 15 毫秒
1.
2.
Measuring Search Engine Quality   总被引:12,自引:3,他引:9  
The effectiveness of twenty public search engines is evaluated using TREC-inspired methods and a set of 54 queries taken from real Web search logs. The World Wide Web is taken as the test collection and a combination of crawler and text retrieval system is evaluated. The engines are compared on a range of measures derivable from binary relevance judgments of the first seven live results returned. Statistical testing reveals a significant difference between engines and high intercorrelations between measures. Surprisingly, given the dynamic nature of the Web and the time elapsed, there is also a high correlation between results of this study and a previous study by Gordon and Pathak. For nearly all engines, there is a gradual decline in precision at increasing cutoff after some initial fluctuation. Performance of the engines as a group is found to be inferior to the group of participants in the TREC-8 Large Web task, although the best engines approach the median of those systems. Shortcomings of current Web search evaluation methodology are identified and recommendations are made for future improvements. In particular, the present study and its predecessors deal with queries which are assumed to derive from a need to find a selection of documents relevant to a topic. By contrast, real Web search reflects a range of other information need types which require different judging and different measures.  相似文献   
3.
4.
5.
6.
The purpose of this study was to determine which study habits distinguish successful from unsuccessful foreign language learners. Participants were 219 college students from a variety of disciplinary backgrounds, enrolled in either Spanish, French, German or Japanese classes. A canonical discriminant analysis (F [6, 117], p < 0.0001; canonical R = 0.92) revealed that, compared to their high-performing counterparts, students with the lowest levels of foreign language performance tended to report that: (a) they frequently include a lot of irrelevant or unimportant information in their notes; (b) when they have difficulty with their assignments, they do not seek help from their instructor; (c) they put their lecture notes away after taking the test and never consult them again; (d) they have to be in the mood before attempting to study; (e) they have a tendency to doodle or to daydream when they are trying to study; and (f) they do not look up in a dictionary the meanings of words that they do not understand. Implications are discussed.  相似文献   
7.
8.
There is now widespread recognition that digital technologies, particularly portable hand held devices capable of Internet connection, present opportunities and challenges to the way in which student learning is organized in schools, colleges and institutions of higher education in the 21st Century. Traxler, Journal of the Research Centre for Educational Technology, 6(1), 3–15 (2010) suggests such devices are pervasive and ubiquitous, conspicuous and unobtrusive, noteworthy and taken-for-granted with everyone typically owning one, using one and often having more than one. As a consequence it has been argued that the availability of such devices, controlled mainly by the student and not the teacher, has the potential to change the traditional dynamics and pedagogical patterns of the learning environment (Burden et al. 2012). Education institutions, however, typically remain organized around spatial and temporal considerations such as buildings, timetables, calendars and internal structures which are designed to classify and manage students. In the case study reported here students and faculty teaching staff from the College of Education in the Kuwait University were surveyed in order to assess their access to such technologies, their capability to use them effectively in support of achieving planned learning outcomes and the implications for change that could emanate from such findings.  相似文献   
9.
A sampling problem is described which was given to the general public to illustrate the problems of bias and the need for randomisation when sampling.  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