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   48736篇
  免费   608篇
  国内免费   84篇
教育   35696篇
科学研究   4346篇
各国文化   400篇
体育   3084篇
综合类   76篇
文化理论   648篇
信息传播   5178篇
  2022年   196篇
  2021年   388篇
  2020年   568篇
  2019年   835篇
  2018年   3160篇
  2017年   3202篇
  2016年   2655篇
  2015年   838篇
  2014年   1109篇
  2013年   7794篇
  2012年   1205篇
  2011年   1774篇
  2010年   1688篇
  2009年   1242篇
  2008年   1530篇
  2007年   2007篇
  2006年   912篇
  2005年   1112篇
  2004年   1057篇
  2003年   926篇
  2002年   748篇
  2001年   747篇
  2000年   681篇
  1999年   629篇
  1998年   362篇
  1997年   400篇
  1996年   424篇
  1995年   342篇
  1994年   334篇
  1993年   301篇
  1992年   478篇
  1991年   461篇
  1990年   513篇
  1989年   480篇
  1988年   421篇
  1987年   380篇
  1986年   395篇
  1985年   456篇
  1984年   391篇
  1983年   360篇
  1982年   280篇
  1981年   288篇
  1980年   266篇
  1979年   377篇
  1978年   329篇
  1977年   261篇
  1976年   251篇
  1975年   215篇
  1974年   197篇
  1973年   232篇
排序方式: 共有10000条查询结果,搜索用时 156 毫秒
101.
102.
103.
Book reviews     
Association of Research Libraries  相似文献   
104.
What is the typical amount of student answer‐changing that takes place in a low‐stakes test environment? Can we use this information to look for evidence of improper answer‐changing (cheating) on high‐stakes test?  相似文献   
105.
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   
106.
107.
A multiple case study of four supervisors indicated that numerous factors shape supervisors' in-session performance and revealed a complex interplay between thoughts and behaviors.  相似文献   
108.
109.
New World Writing, a magazine founded by New American Library in 1952, quickly became an important vehicle for liberal intellectual and literary thought. In addition to providing an outlet for new writing, the magazine became an important acquisitions tool for NAL. Throughout its lifetime, New World Writing remained a showcase for many of the finest writers of the 1950s, including Christopher Isherwood, Louis Auchincloss, Tennessee Williams, Flannery O’Connor, Jack Kerouac, and Gore Vidal. He is the author of Under Cover: An Illustrated History of American Mass Market Paperbacksand Heavy Traffic and High Culture: The New American Library as Literary Gatekeeper. He is working on a study of American literary agents  相似文献   
110.
Coordination variability and skill development in expert triple jumpers   总被引:1,自引:0,他引:1  
The aim of this study was to examine the influence of skill of expert triple jumpers on the coordination variability of lower extremity intra-limb couplings. In contrast to the traditional motor learning perspective, we hypothesized that as skill and thus performance increases, movement coordination variability will also increase. Three-dimensional kinematic and ground reaction force data were collected during the hop-step transition phase of the triple jump. Relative motion plots and a modified vector coding technique were used to quantify the coordination variability across the trials. The results were consistent with a U-shaped curve, representing coordination variability, as skill increases. The high coordination variability in less skilled athletes is present while the appropriate characteristics defining the movement coordination patterns are acquired. This coordination variability may not be beneficial to performance. As the refinement of these characteristics is achieved, coordination variability decreases, resulting in a more consistent or regulated performance. In the final stages of developing a skilled performance, a functional variability is accessed that brings flexibility to the system allowing it to cope with perturbations. This study highlights the need to address the learning effect when analysing coordination variability from a dynamical systems perspective.  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