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   19034篇
  免费   187篇
  国内免费   20篇
教育   12540篇
科学研究   3135篇
各国文化   129篇
体育   1323篇
综合类   7篇
文化理论   123篇
信息传播   1984篇
  2021年   184篇
  2020年   263篇
  2019年   379篇
  2018年   548篇
  2017年   513篇
  2016年   446篇
  2015年   296篇
  2014年   456篇
  2013年   3275篇
  2012年   416篇
  2011年   432篇
  2010年   360篇
  2009年   331篇
  2008年   380篇
  2007年   349篇
  2006年   300篇
  2005年   287篇
  2004年   299篇
  2003年   245篇
  2002年   252篇
  2001年   340篇
  2000年   359篇
  1999年   317篇
  1998年   171篇
  1997年   210篇
  1996年   211篇
  1995年   147篇
  1994年   186篇
  1993年   156篇
  1992年   277篇
  1991年   251篇
  1990年   244篇
  1989年   296篇
  1988年   235篇
  1987年   204篇
  1986年   261篇
  1985年   253篇
  1984年   206篇
  1983年   213篇
  1982年   167篇
  1981年   161篇
  1980年   159篇
  1979年   233篇
  1978年   174篇
  1977年   163篇
  1976年   149篇
  1974年   164篇
  1973年   143篇
  1972年   128篇
  1971年   146篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
31.
32.
Schneider  William H. 《Minerva》2003,41(2):155-166
From 1919 to 1951, Alan Gregg and his mentor, Richard Pearce, directed the Medical Education and Medical SciencesDivisions of the Rockefeller Foundation. Although they oversaw the expenditure of millions of dollars, today they are forgotten. Yet, the system that Gregg administered became the model for the funding of biomedical research after the Second World War. This paper draws on the records of the Rockefeller Foundation to assess Gregg and his impact on biomedicine and philanthropy.  相似文献   
33.
34.
35.
36.
37.
The many challenges faced by health sciences libraries of all types and sizes often require innovative solutions. When an innovative solution involves calculated risk taking, the approach is called intrapreneurial. At the University of Miami School of Medicine, an intrapreneurial approach solved the fiscal problems of the biomedical communications unit. The Louis Calder Memorial Library inherited these problems when the Department of the Library and Biomedical Communications was created in the early 1980s. In this paper, two intrapreneurial programs are described, and the benefit and suitability of this management style to information services are demonstrated.  相似文献   
38.
The purpose of this investigation was to describe the morphological parameters that characterize elite age group divers. Comparisons are made to normative age group data from the Coquitlam Growth Study and the constancy of important characteristics from age group to age group is examined. Data were collected on 27 male and 28 female elite divers who participated in the 1990 North American Age Group Diving Championships. Body build, body composition and skinfold corrected diameters were determined from 36 anthropometric parameters and analysed by ANOVA, t-test and Phantom z-scores procedures. All age groups except the 14- to 15-year-old males were significantly (P < or = 0.05) shorter than their norms but recorded higher androgyny index values. The estimated relative muscle mass increased significantly (P < or = 0.05) with age for males at all ages (40.8-46.3%). The 16- to 18-year-old females had a significantly (P < or = 0.05) larger relative muscle component compared to the younger age groups (40.1-38.4%). When normalized for height, active tissue development of the extremities was comparable between the sexes except in the forearm. The results indicate that at all age levels short stature is an important characteristic for divers. Analysis of regional active tissue development provides further insight into sport-specific prerequisites for success at elite levels.  相似文献   
39.
40.
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