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   122506篇
  免费   1872篇
  国内免费   238篇
教育   85293篇
科学研究   13461篇
各国文化   2009篇
体育   9416篇
综合类   172篇
文化理论   1077篇
信息传播   13188篇
  2021年   933篇
  2020年   1689篇
  2019年   2594篇
  2018年   3127篇
  2017年   3422篇
  2016年   3437篇
  2015年   2359篇
  2014年   3240篇
  2013年   27566篇
  2012年   2399篇
  2011年   2723篇
  2010年   2357篇
  2009年   2656篇
  2008年   2410篇
  2007年   2112篇
  2006年   2352篇
  2005年   2341篇
  2004年   3019篇
  2003年   2348篇
  2002年   2148篇
  2001年   2016篇
  2000年   1713篇
  1999年   1544篇
  1998年   1473篇
  1997年   1533篇
  1996年   1703篇
  1995年   1490篇
  1994年   1472篇
  1993年   1480篇
  1992年   1492篇
  1991年   1395篇
  1990年   1397篇
  1989年   1323篇
  1988年   1184篇
  1987年   1118篇
  1986年   1130篇
  1985年   1415篇
  1984年   1283篇
  1983年   1280篇
  1982年   1252篇
  1981年   1175篇
  1980年   1169篇
  1979年   1221篇
  1978年   1201篇
  1977年   1109篇
  1976年   1005篇
  1975年   799篇
  1974年   803篇
  1973年   773篇
  1972年   557篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
Objective: To analyze the possible dose-response association between components of sports participation (intensity, volume and previous engagement) and 4-year mortality rates among Brazilian adults.

Methods: 679 males and females (mean age among men = 66.7 ± 9.3 years old and mean age among women = 64.8 ± 8.9 years old) composed the study sample. Sports participation was assessed using Baecke’s questionnaire, which considers intensity, duration and previous engagement. Medical records were used to identify the cause of the death. Cox regression analysis was performed to determine the independent associations of exercise components and mortality.

Results: Participants that reported exercising at moderate-vigorous intensity (Moderate/vigorous: 4.1% versus None/light: 10.3% [p-value = 0.012]; HR = 0.42 [0.1 to 0.94)] and for more than four months (≥4 months: 5.3% versus <4 months: 10.2% [p-value = 0.038]; HR = 0.47 [0.24 to 0.94]) had lower mortality risk. The percentage of survival according to all-cause mortality was significantly higher for participants engaged in sports at moderate-vigorous intensity (p-value = 0.014), as well as for those engaged in sports for periods superior than four months (p-value = 0.036).

Conclusion: We found higher percentage of survival among adults engaged in sports at moderate-vigorous intensity and with at least four months of previous engagement.  相似文献   

993.
994.
In this essay, Jennifer Morton discusses educators as central examples of agents who engage in ideal and nonideal ways of thinking. The educator, as a representative of the political community, is tasked with two aims. The first is nurturing students with the skills and knowledge they need for the world as they will find it. In pursuing this goal, the educator is assuming certain social facts, some of them unjust, that constitute the present nonideal world. The second aim is civic — educating future citizens. Insofar as the educator is involved in pursuing this goal, his or her role is to work at making certain future social facts true, in the hope of making the future slightly more ideal. Morton argues that if we think of these two aims instrumentally, they can come into conflict. She does not suggest a resolution to this conflict, but rather develops an alternative expressive account of the civic role of the educator. Ideal thinking by educators, Morton maintains, should be thought of as constituting an expression of respect toward their fellow citizens here and now. Ultimately, she argues that this expressive component of the educator's job is crucial to the educator's role in the political community.  相似文献   
995.
N. Mukunda 《Resonance》2011,16(9):796-797
  相似文献   
996.
997.
998.
There remains significant confusion surrounding the purpose, audience, and proposed application of the Framework for Information Literacy for Higher Education. This exploratory study addresses the question of whether undergraduate students can understand the language and concepts in this document. By presenting student responses to pretest questions recorded at the beginning of a semester-long research methods course, this article shows that students can, even on first impression, begin to make sense of the complexity and richness found in the Framework for Information Literacy for Higher Education.  相似文献   
999.
1000.
We present a variant of the Game of Pig to introduce the concepts of probability, simulation and expected value.  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