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   38897篇
  免费   1741篇
  国内免费   28篇
  40666篇
  2020年   486篇
  2019年   498篇
  2018年   798篇
  2017年   750篇
  2016年   776篇
  2015年   554篇
  2014年   684篇
  2013年   2970篇
  2012年   1216篇
  2011年   1338篇
  2010年   751篇
  2009年   821篇
  2008年   1117篇
  2007年   1084篇
  2006年   985篇
  2005年   840篇
  2004年   829篇
  2003年   789篇
  2002年   757篇
  2001年   1431篇
  2000年   1418篇
  1999年   1013篇
  1998年   431篇
  1997年   392篇
  1993年   336篇
  1992年   832篇
  1991年   728篇
  1990年   816篇
  1989年   725篇
  1988年   694篇
  1987年   649篇
  1986年   684篇
  1985年   730篇
  1984年   557篇
  1983年   481篇
  1982年   345篇
  1979年   532篇
  1978年   417篇
  1977年   335篇
  1976年   340篇
  1975年   489篇
  1974年   581篇
  1973年   545篇
  1972年   476篇
  1971年   411篇
  1970年   359篇
  1969年   426篇
  1968年   492篇
  1967年   417篇
  1966年   454篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
33.
Recent studies demonstrating that multiple meanings of an ambiguous word are initially accessed even when only one reading is syntactically appropriate with the preceding context can be criticized on at least two grounds. First, many of the syntactic contexts used were not truly restrictive, and, secondly, subjects may not have had time to integrate the context before processing the ambiguous word. In the present study, subjects listened to a sentence ending in an ambiguous word and then made a lexical decision to a target related to either the appropriate or inappropriate reading. Contexts were completely restrictive, and a pause was introduced between the context and the ambiguous word. Multiple access still obtained, providing further support for the claim that lexical access is not guided by syntactic context.  相似文献   
34.
35.
36.
37.
38.
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   
39.
40.
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   
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