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   3858篇
  免费   73篇
教育   2966篇
科学研究   175篇
各国文化   45篇
体育   242篇
综合类   1篇
文化理论   17篇
信息传播   485篇
  2023年   22篇
  2022年   32篇
  2021年   51篇
  2020年   100篇
  2019年   152篇
  2018年   194篇
  2017年   194篇
  2016年   160篇
  2015年   105篇
  2014年   146篇
  2013年   877篇
  2012年   103篇
  2011年   93篇
  2010年   76篇
  2009年   92篇
  2008年   97篇
  2007年   82篇
  2006年   104篇
  2005年   78篇
  2004年   92篇
  2003年   52篇
  2002年   59篇
  2001年   49篇
  2000年   53篇
  1999年   53篇
  1998年   36篇
  1997年   41篇
  1996年   47篇
  1995年   26篇
  1994年   45篇
  1993年   29篇
  1992年   30篇
  1991年   25篇
  1990年   27篇
  1989年   23篇
  1988年   21篇
  1987年   23篇
  1986年   23篇
  1985年   27篇
  1984年   27篇
  1983年   19篇
  1982年   17篇
  1981年   19篇
  1980年   13篇
  1979年   30篇
  1978年   12篇
  1977年   20篇
  1974年   14篇
  1973年   11篇
  1972年   11篇
排序方式: 共有3931条查询结果,搜索用时 0 毫秒
151.
In 1998 Thomas Jefferson University offered its first entirely online course. Librarians and library staff were integral in the development, support, evaluation, and refinement of this course. While staff members may have taken non-traditional roles in this effort, their roles generally fell within the broad guidelines of assisting University faculty with information and knowledge management. The development and support of distance course offerings will continue to be a focus at Scott Memorial Library.  相似文献   
152.
Forty-nine previously sedentary or low active individuals aged 40-71 years were allocated to three groups. The long walking group participated in an 18-week walking programme which consisted of walks lasting 20-40 min; the repetitive short walking group completed walks of between 10 and 15 min, up to three times a day, with no less than 120 min between each walk; and the control group maintained their low level of activity. Both walking programmes began at a prescribed 60 min x week(-1), which increased steadily up to 200 min x week(-1) by week 12. During the study, the long walking group walked for an estimated 2514 min (139 min x week(-1)), expending an estimated 67.5 MJ (3.72 MJ x week(-1)) at an estimated 73% of their age-predicted maximum heart rate and 68% of their estimated VO2max. The repetitive short walking group walked for an estimated 2476 min (135 min x week(-1)), expending an estimated 58.5 MJ (3.17 MJ x week(-1)) at an estimated 71% of their age-predicted maximum heart rate and 65% of their estimated VO2max. The results showed a statistically significant reduction in heart rate during a standardized step test (pre- vs post-intervention) in both walking groups, indicating an improvement in aerobic fitness, although the control group showed a higher average heart rate during the post-intervention test, indicating reduced fitness. When compared with the male subjects pre-intervention, the females possessed more favourable levels of high-density lipoprotein (HDL) cholesterol (P< 0.001), apolipoprotein (apo) AI (P < 0.001) and ratios of total cholesterol:HDL cholesterol (P< 0.02) and low-density lipoprotein (LDL) cholesterol: HDL cholesterol (P< 0.02). Compared with the controls post-intervention, the walking groups showed no statistically significant changes in total cholesterol, LDL cholesterol, HDL cholesterol, apo AI, apo AII, apo B, or the ratios of total cholesterol: HDL cholesterol, LDL cholesterol: HDL cholesterol, apo AI: apo B or apo AI: apo AII (P > 0.05). Relative to the walking groups, factor XIIa increased in the control group (P < 0.05). We conclude that, although both walking programmes appeared to improve aerobic fitness, there was no evidence of improvements in the blood lipids or associated apolipoproteins of the walking groups. Further analysis indicated that this apparent lack of change may have been related to the subjects' relatively good pre-intervention blood lipid profiles, which restricted the potential for change. The implications of the observed changes in the coagulation/fibrinolytic factors remain unclear.  相似文献   
153.
154.
155.
The paper examines how the author has used what he calls action learning to encourage pupils to learn about citizenship in a secondary school. The paper argues that citizenship can be learnt by engaging young people in projects and other activities, which encourage them to develop an understanding of the responsibilities and skills needed to become citizens in society. The paper goes on to describe a small-scale research project which sought to assess the pupils' reactions to action learning. The young people's responses bring to life what they have learnt from their involvement in the action learning projects and how it has helped them to develop as citizens.  相似文献   
156.
157.
158.
159.
This paper considers the relationship between stress and cognitive functioning and discusses some of the concepts and methods that may be adopted to examine the relationship between stress and sports performance. It considers only that literature that may be relevant to, or furthers, the understanding of sports performance under competitive stress. One of the most popular approaches has been to explain the relationship in terms of the unidimensional inverted-U hypothesis. The validity of this approach to explaining sports performances in specific situations is discussed and it is generally concluded that the inverted-U hypothesis is too vague and simplistic. The discussion considers multidimensional approaches and discusses the suitability and implications of some more recent and more complex models of stress and performance which are now available in the psychological literature. It is concluded that the relationship between stress and sports performance is an extremely complex one and involves the interaction between the nature of the stressor, the cognitive demands of the task being performed and the psychological characteristics of the individuals performing it.  相似文献   
160.
Texts in Context     
Elizabeth Yale 《Metascience》2008,17(1):105-109
  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