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   120274篇
  免费   1845篇
  国内免费   240篇
教育   83454篇
科学研究   13290篇
各国文化   1980篇
体育   9204篇
综合类   178篇
文化理论   1050篇
信息传播   13203篇
  2021年   923篇
  2020年   1629篇
  2019年   2535篇
  2018年   3008篇
  2017年   3302篇
  2016年   3338篇
  2015年   2292篇
  2014年   3167篇
  2013年   27139篇
  2012年   2351篇
  2011年   2700篇
  2010年   2315篇
  2009年   2617篇
  2008年   2362篇
  2007年   2086篇
  2006年   2345篇
  2005年   2344篇
  2004年   3013篇
  2003年   2325篇
  2002年   2139篇
  2001年   1988篇
  2000年   1659篇
  1999年   1549篇
  1998年   1448篇
  1997年   1509篇
  1996年   1683篇
  1995年   1462篇
  1994年   1455篇
  1993年   1462篇
  1992年   1480篇
  1991年   1397篇
  1990年   1375篇
  1989年   1318篇
  1988年   1174篇
  1987年   1125篇
  1986年   1145篇
  1985年   1415篇
  1984年   1291篇
  1983年   1274篇
  1982年   1243篇
  1981年   1169篇
  1980年   1153篇
  1979年   1153篇
  1978年   1041篇
  1977年   958篇
  1976年   865篇
  1975年   691篇
  1974年   695篇
  1973年   661篇
  1972年   512篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
981.
982.
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   

983.
984.
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   
985.
N. Mukunda 《Resonance》2011,16(9):796-797
  相似文献   
986.
987.
988.
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   
989.
990.
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