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   94293篇
  免费   3081篇
  国内免费   27篇
  2020年   712篇
  2019年   937篇
  2018年   4385篇
  2017年   3774篇
  2016年   3441篇
  2015年   1210篇
  2014年   1281篇
  2013年   5825篇
  2012年   2733篇
  2011年   4527篇
  2010年   3738篇
  2009年   2810篇
  2008年   3579篇
  2007年   4048篇
  2006年   1944篇
  2005年   1916篇
  2004年   1765篇
  2003年   1610篇
  2002年   1692篇
  2001年   2484篇
  2000年   2452篇
  1999年   1858篇
  1998年   877篇
  1997年   778篇
  1996年   804篇
  1995年   695篇
  1992年   1562篇
  1991年   1462篇
  1990年   1438篇
  1989年   1318篇
  1988年   1310篇
  1987年   1240篇
  1986年   1308篇
  1985年   1339篇
  1984年   1108篇
  1983年   1004篇
  1982年   722篇
  1981年   727篇
  1979年   1194篇
  1978年   864篇
  1975年   972篇
  1974年   1092篇
  1973年   1200篇
  1972年   987篇
  1971年   946篇
  1970年   872篇
  1969年   860篇
  1968年   1114篇
  1967年   1013篇
  1966年   866篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
111.
112.
113.
114.
115.
116.
117.
The purpose of this paper is to study the convergent validity of the four most widely used burnout measures in a sample of Chinese nurses (N= 717). First, Structural Equation Modeling was used to investigate the factor structure of scores produced by the Maslach Burnout Inventory‐General Survey (MBI‐GS), the Burnout Measure (BM), the Shirom‐Melamed Burnout Measure (SMBM), and the Oldenburg Burnout Inventory (OLBI). Next, several competing models were tested to investigate the convergent validity of these four burnout instruments. The final results suggest that burnout is best conceived of as a multidimensional construct consisting of exhaustion and withdrawal, which are two related but conceptually distinct aspects. In addition, positively phrased items should be dropped from burnout measures for they constitute a separate factor that is considered to be an artifact.  相似文献   
118.
Public goods theories highlight an incentive system that rewards ‘free riding’ on the contributions of early contributors toward collective actions. However, because such theories focus on creation of the good, they may underestimate returns that accrue to early contributors subsequent to the good's realization. The concept of formative investment is introduced here to describe the extent to which organizations help to create public goods such as interorganizational linkages like participatory federations. Data from the CEOs of 48 organizations involved in a participatory federation were used to assess how an organization's level of formative investment is related to later patterns of dependency and interaction among federation members. Findings suggest that from a long‐term perspective, and for goods that involve communication and interaction, the incentive structure may not be so favorable for free riders. To the extent that organizations with high formative investment have the capability to envision the future and communicate that vision to potential federation partners, they may be able to both reduce free riding and secure for themselves advantageous positions in the subsequent network of relations.  相似文献   
119.
In Experiment 1, rats were trained on a discrimination between rubber- and sandpaper-covered arms of a maze after one group had been pre-exposed to these intra-maze cues. Pre-exposure facilitated subsequent discrimination learning, unless the discrimination was made easier by adding further discriminative stimuli, when it now significantly retarded learning. In Experiment 2, rats were trained on an extra-maze spatial discrimination, again after one group, but not another, had been pre-exposed to the extra-maze landmarks. Here too, pre-exposure facilitated subsequent discrimination learning, unless the discrimination was made substantially easier by arranging that the two arms between which rats had to choose were always separated by 135°. The results of both experiments can be explained by supposing that perceptual learning depends on the presence of features common to S+ and S-.  相似文献   
120.
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