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   3894篇
  免费   40篇
教育   2714篇
科学研究   320篇
各国文化   63篇
体育   358篇
综合类   2篇
文化理论   56篇
信息传播   421篇
  2021年   38篇
  2020年   75篇
  2019年   109篇
  2018年   124篇
  2017年   118篇
  2016年   98篇
  2015年   68篇
  2014年   121篇
  2013年   897篇
  2012年   88篇
  2011年   96篇
  2010年   81篇
  2009年   79篇
  2008年   87篇
  2007年   79篇
  2006年   94篇
  2005年   83篇
  2004年   77篇
  2003年   73篇
  2002年   57篇
  2001年   49篇
  2000年   57篇
  1999年   53篇
  1998年   58篇
  1997年   48篇
  1996年   44篇
  1995年   37篇
  1994年   35篇
  1993年   41篇
  1992年   33篇
  1991年   40篇
  1990年   44篇
  1989年   46篇
  1988年   45篇
  1987年   46篇
  1986年   36篇
  1985年   32篇
  1984年   36篇
  1983年   46篇
  1982年   32篇
  1981年   21篇
  1980年   27篇
  1979年   43篇
  1978年   45篇
  1977年   32篇
  1976年   31篇
  1975年   19篇
  1974年   24篇
  1973年   26篇
  1971年   18篇
排序方式: 共有3934条查询结果,搜索用时 15 毫秒
121.
During the coming years the number of older adults will increase dramatically, which will require a corresponding increase in the number of social workers who have accurate knowledge of this population. This article reports the impact focus groups with older adults and with service providers who work with older adults and their families have on baccalaureate social work (BSW) students. We find that BSW students exposed to focus groups have their negative attitudes about older adults and service providers deconstructed and replaced with more positive and accurate information about older adults. When students' misconceptions about older adults are confronted, they become more interested in choosing geriatric social work as a career option.  相似文献   
122.
123.
124.
125.
What two major approaches have been used to study gender bias in test scores? How do statistical DIF detection methods differ? How does DIF screening of items affect mean score differences?  相似文献   
126.
127.
128.
In three experiments, rats received pairings of flavor conditioned stimuli with polycose unconditioned stimuli, in either a simultaneous or a sequential relation. Both temporal relations produced excellent conditioned increases in consumption of the flavors. Separate presentation of the flavors resulted in extinction in both cases. However, restoring the pairing of the flavor with polycose resulted in reconditioning only with the sequential, not with the simultaneous, relation.  相似文献   
129.
The influence of moment of inertia on baseball/softball bat swing speed   总被引:1,自引:1,他引:0  
The speed at which a player can swing a bat is central to the games of baseball and softball, determining, to a large extent, the hit speed of the ball. Experimental and analytical studies of bat swing speed were conducted with particular emphasis on the influence of bat moment of inertia on swing speed. Two distinct sets of experiments measured the swing speed of colege baseball and fast-pitch softball players using weighted rods and modified bats. The swing targets included flexible targets, balls on a tee and machine pitched balls. Internal mass alterations provided a range of inertial properties. The average measured speeds, from 22 to 31 m s−1, are consistent with previous studies. Bat speed approximately correlates with the moment of inertia of the bat about a vertical axis of rotation through the batter's body, the speed generally decreasing as this moment of inertia increases. The analytical model assumes pure rotation of the batter/bat system about a vertical axis through the batter's body. Aerodynamic drag of the batter's arms and the bat is included in the model. The independent variable is bat moment of inertia about the rotation axis. There is reasonable agreement between the model and the measured speeds. Detailed differences between the two suggest the importance of additional degrees of freedom in determining swing speed.  相似文献   
130.
Conclusion In this paper we briefly described the current status of research in the field of digital libraries interoperability, mainly with respect to federated data processing such as permitted within the Open Archive Initiative framework. We then presented the CERN Document Server Software suite that is a free software package main-tained by CERN providing an online digital library solution for mid- to large-sized document repositories. The set of CDSware modules was described and the differ-ences with other existing tools briefly mentioned. Finally we have mentioned a typical usage statistics illustrating the scope of grey literature and networked con-ditions of the CERN Document Server. We pointed out that the current trend in grey literature management goes toward institutional repositories build upon the distributed and federated model. Further research is going on within the CDS collaboration in this area, focused particularly on (i) semantic interoperability using ontologies in distributed and federated data processing and (ii) ranking technologies when searching grey literature in OAI compliant repositories.  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