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   72702篇
  免费   3062篇
  国内免费   30篇
  75794篇
  2020年   876篇
  2019年   968篇
  2018年   1450篇
  2017年   1432篇
  2016年   1491篇
  2015年   1049篇
  2014年   1315篇
  2013年   6076篇
  2012年   2385篇
  2011年   2442篇
  2010年   1430篇
  2009年   1539篇
  2008年   2135篇
  2007年   2084篇
  2006年   1939篇
  2005年   1616篇
  2004年   1647篇
  2003年   1577篇
  2002年   1493篇
  2001年   2451篇
  2000年   2332篇
  1999年   1751篇
  1998年   806篇
  1997年   712篇
  1996年   760篇
  1995年   685篇
  1994年   677篇
  1993年   686篇
  1992年   1455篇
  1991年   1311篇
  1990年   1342篇
  1989年   1267篇
  1988年   1210篇
  1987年   1157篇
  1986年   1147篇
  1985年   1263篇
  1984年   1003篇
  1983年   847篇
  1982年   659篇
  1979年   1019篇
  1978年   768篇
  1975年   856篇
  1974年   965篇
  1973年   971篇
  1972年   826篇
  1971年   759篇
  1969年   666篇
  1968年   846篇
  1967年   742篇
  1966年   737篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
61.
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   
62.
63.
The token economy has been the primary model for the behavioral management of inpatient populations. However, this basically operant approach seldom emphasizes the development of cognitive-coping skills to help patients more effectively manage stressors that result in hospitalization. The Therapeutic Contract Program (TCP) is described as an inpatient-treatment strategy that is designed to help foster such cognitive-coping and self-control skills. While external structure is provided by components of this program, subprograms of the TCP have as their goal the development of internally-attributed coping skills and self-perceptions of competence. This preliminary report describes the structure of the TCP, as well as planned and in-progress measures of program participation and treatment outcome.  相似文献   
64.
65.
66.
67.
68.
69.
The positive link between attitude similarity and attraction is one of the fundamental outcomes in social psychology. However, attitude dissimilarity seems to be a stronger driver of this relationship than attitude similarity. The authors review the evidence on this similarity–dissimilarity asymmetry, and discuss two explanations. One is that people generally enter into interactions with optimism, and so supposedly neutral partners are often seen as mildly positive. Another is that dissimilar attitudes carry greater weight than similar attitudes in cognitive processes. Implications of these mechanisms for wider issues in person perception and attitude structure are discussed, connecting them with more recent theories of attitudinal ambivalence and evaluative space.  相似文献   
70.
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