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   116898篇
  免费   4824篇
  国内免费   46篇
  2020年   1243篇
  2019年   1527篇
  2018年   2140篇
  2017年   2239篇
  2016年   2353篇
  2015年   1695篇
  2014年   1996篇
  2013年   9592篇
  2012年   3687篇
  2011年   3829篇
  2010年   2375篇
  2009年   2376篇
  2008年   3309篇
  2007年   3370篇
  2006年   3051篇
  2005年   2670篇
  2004年   2584篇
  2003年   2452篇
  2002年   2496篇
  2001年   3660篇
  2000年   3487篇
  1999年   2666篇
  1998年   1325篇
  1997年   1183篇
  1996年   1236篇
  1995年   1112篇
  1992年   2251篇
  1991年   2117篇
  1990年   2133篇
  1989年   1971篇
  1988年   1922篇
  1987年   1826篇
  1986年   1873篇
  1985年   1935篇
  1984年   1646篇
  1983年   1458篇
  1982年   1086篇
  1981年   1093篇
  1979年   1724篇
  1978年   1278篇
  1975年   1414篇
  1974年   1601篇
  1973年   1714篇
  1972年   1404篇
  1971年   1330篇
  1970年   1223篇
  1969年   1202篇
  1968年   1523篇
  1967年   1381篇
  1966年   1231篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
161.
162.
163.
164.
165.
166.
167.
168.
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   
169.
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   
170.
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   
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