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   6381篇
  免费   92篇
  国内免费   12篇
教育   4668篇
科学研究   352篇
各国文化   81篇
体育   625篇
综合类   5篇
文化理论   86篇
信息传播   668篇
  2023年   19篇
  2022年   42篇
  2021年   69篇
  2020年   115篇
  2019年   199篇
  2018年   243篇
  2017年   261篇
  2016年   242篇
  2015年   155篇
  2014年   194篇
  2013年   1391篇
  2012年   200篇
  2011年   193篇
  2010年   207篇
  2009年   191篇
  2008年   195篇
  2007年   203篇
  2006年   154篇
  2005年   133篇
  2004年   135篇
  2003年   105篇
  2002年   129篇
  2001年   80篇
  2000年   124篇
  1999年   93篇
  1998年   80篇
  1997年   78篇
  1996年   79篇
  1995年   66篇
  1994年   70篇
  1993年   67篇
  1992年   60篇
  1991年   80篇
  1990年   62篇
  1989年   58篇
  1988年   46篇
  1987年   52篇
  1986年   49篇
  1985年   52篇
  1984年   63篇
  1983年   45篇
  1982年   43篇
  1981年   38篇
  1980年   35篇
  1979年   27篇
  1978年   36篇
  1977年   39篇
  1976年   28篇
  1975年   21篇
  1974年   22篇
排序方式: 共有6485条查询结果,搜索用时 15 毫秒
1.
The quality of decision and assessment of risk are key determinants of successful sport performance. Athletes differ fundamentally in their decision-making ability according to their athletic expertise level. Moreover, given the influence of emotions on decision-making, it is likely that a trait reflecting emotional functioning, trait emotional intelligence, may also influence decision-making. Therefore, the aim of this research was to investigate the respective contribution of athletic expertise and trait emotional intelligence to non-athletic decision-making. In total, 269 participants aged between 18 and 26 years with a range of athletic experience i.e. none (n?=?71), novice (n?=?54), amateur (n?=?55), elite (n?=?45) and super-elite (n?=?44), completed the Emotional Intelligence Scale and the Cambridge Gambling Task. Regression modelling indicated a significant positive relationship of athletic expertise and trait emotional intelligence with the quality of decision-making, and a negative relationship with deliberation time and risk-taking. Cognitive skills transfer may explain the higher decision-making scores associated with higher athletic expertise, while individuals with higher trait emotional intelligence may anticipate better the emotional consequences linked with a gambling task, which may help individuals make better decisions and take less risks.  相似文献   
2.
3.
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   
4.
5.
6.
7.
8.
The Copyright Licensing and Administration Society of Singapore was established in 1999. It is now profitable and commercially significant, perhaps uniquely so in Asia. Critical factors in its growth have included a statutory (non‐voluntary) photocopying licence provision for educational institutions in the Copyright Act; and widespread support from the local and international communities of rightsholders. Tentative consensus has been established with educators over a fair level of remuneration for copying. Further work needs to be done to extend or amend the current model for electronic copying, for the private sector and for other countries in the region.  相似文献   
9.
The development of peak performances is a main research focus in sports science. It is unclear how many former top junior athletes achieve success in the elite class later. The aim of the present study was to examine the careers of athletes who participated in major junior or adult/elite cycling events using prospective and retrospective analysis of competition results. The official results of major junior (age < or = 18 years) and elite (age > 18 years) cycling races from 1980 to 2004 were analysed. Age-related aspects, career lengths, and success were compared between riders who presented results in both junior and elite races (JUNIOR ELITE) and riders who had no junior race results (ELITE ONLY). Altogether, 27,454 results of 8004 athletes from 108 countries were collected. We found that 29.4% of the elite athletes had participated in junior World Championships, and that 34% of the participants in junior World Championships later participated in major elite competitions. JUNIOR ELITE athletes are significantly more successful in several cycling disciplines and have their first and last elite result at a younger age than ELITE ONLY athletes. No difference was found in career lengths. The data presented here emphasize the importance of long-term training programmes in the development of peak performance in cycling.  相似文献   
10.
During the rewriting of its program in the early 1980s, theRassemblement pour la République (RPR) carried out anumber of opinion surveys. The person in charge of this wasnot a member of the inner leadership circle; he warned the partyleader, Jacques Chirac, that themes forming a coherent ‘liberal’program for the transformation of the relationship between citizens,state, and the economy, were not popular with public opinion,which remained attached to progressive taxation and a comprehensivesocial welfare system. The party leadership ignored these warnings.Rather than attempting to align their policies with voter aspirations,their principal use of political communications techniques aimedat improving their leader's image. The person in charge of thiswork was a stranger to politics whose understanding of the waycultural or political attitudes are changed led him to interpretvery fatalistically the chances of influencing election outcomesby communications techniques. His methods were treated withfrank skepticism by party communications colleagues, his client'spersonality was particularly unamenable to his efforts, andhis one successful initiative—the rejuvenation of theexecutive committee—was operated at the cost of a rowin the party. In the case of the RPR, opinion research seemsto have played no role at all in an important party policy review,the causes of which should be sought elsewhere.  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