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   22080篇
  免费   98篇
  2021年   22篇
  2020年   34篇
  2019年   35篇
  2018年   3528篇
  2017年   2855篇
  2016年   2288篇
  2015年   223篇
  2014年   117篇
  2013年   262篇
  2012年   623篇
  2011年   2435篇
  2010年   2540篇
  2009年   1512篇
  2008年   1754篇
  2007年   2235篇
  2006年   93篇
  2005年   278篇
  2004年   214篇
  2003年   160篇
  2002年   105篇
  2001年   67篇
  2000年   86篇
  1999年   50篇
  1998年   54篇
  1997年   32篇
  1996年   30篇
  1995年   26篇
  1994年   22篇
  1993年   13篇
  1992年   20篇
  1991年   18篇
  1990年   22篇
  1989年   23篇
  1988年   18篇
  1987年   15篇
  1986年   14篇
  1985年   24篇
  1984年   25篇
  1982年   21篇
  1981年   20篇
  1980年   16篇
  1979年   22篇
  1978年   15篇
  1977年   21篇
  1976年   16篇
  1974年   16篇
  1973年   21篇
  1971年   12篇
  1970年   16篇
  1969年   13篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
We examined the effects of three reinforcement histories on the persistence of task engagement by 2 fourth-grade students using a partially counterbalanced ABCDBCD design. In each condition, an experimenter made four student contacts during the first 2 min of each session (reinforcement baseline), followed by an 8-min extinction period. The reinforcement history that contained an instructional control component produced the greatest persistence in student engagement. The applied relevance of instructional control is discussed.  相似文献   
63.
Peter Lewis 《Topoi》1995,14(1):23-33
The GRW theory is a recent attempt to solve the measurement problem in quantum mechanics, and the tails problem is a well-known and potentially fatal criticism of the GRW theory. The first half of the paper is an exposition of the measurement problem, the GRW theory, and the tails problem. In the remainder of the paper, two methods of dealing with the tails problem are considered: first, altering the GRW theory so as to avoid the tails problem; and second, denying that the tails problem is more than a novel aspect of a universal vagueness in the way scientific theories relate to everyday language.  相似文献   
64.
Group therapy investigations are often conducted by researchers rather than by experienced clinicians who also possess research expertise. Given the fact that doctorally prepared clinicians must demonstrate research competence in their education programs, it is surprising that there is not more research on group therapy. The literature indicates that research and group psychotherapy practice are considered quite separate entities. However, there is much that both processes have in common. The principal investigator's experience during a group psychotherapy research project suggested that the conflict between the roles of researcher and clinician may not be due to differences in the external processes but rather to difficulties in trying to combine them within one person. The value of the researcher-clinician is elaborated, and recommendations are offered.This paper was supported by a grant from the Group Psychotherapy Foundation.  相似文献   
65.
Certification and licensure are important credentials for counselors. In less than 25 years, licensure laws on counseling have been passed in 41 states and the District of Columbia. Although much progress has been made regarding certification and licensure, all is not bliss. A reaction to certification and licensure issues is provided.  相似文献   
66.
This study examined 10 factors and their relation to the life satisfaction of single middle-aged professional women. The proposed regression model, which included job satisfaction, gender identity, locus of control, social support, health, financial resources, leisure-time activities, sexual satisfaction, and regrets regarding life circumstances, was explored through a questionnaire. Questionnaires were administered to single professional women in higher education institutions. Responses were received from 152 women. Performance on life satisfaction was significantly explained by recourse to the variables of job satisfaction, internal locus of control, regrets regarding life circumstances, sexual satisfaction, and leisure-time activities.  相似文献   
67.
In the present study, a naturalistic functional analysis procedure was used to assess the effect of environmental stimulation on the stereotypic behavior (body rocking) of an adult whose stereotypy appeared to be induced by an acquired brain injury. Environmental stimulation, operationalized in terms of both physical and social characteristics, resulted in only minimal changes in the occurrence of body rocking. Body rocking occurred in excess of 50% of the observations in all environmental stimulation conditions and in a naturally occurring baseline condition. To our knowledge, this is the first published report of a functional analysis of stereotypy associated with acquired brain injury.  相似文献   
68.
A mother's (prenatal) wish for a girl has, at times, been implicated as an etiological factor for boyhood femininity or its DSM-III-R diagnostic equivalent, the Gender Identity Disorder of Childhood. In one sample of 52 feminine and 52 nonclinical control boys from Los Angeles, the proportion of mothers who recalled a wish for a girl during the pregnancy did not differ significantly between groups (26.9% vs. 19.2%, respectively); however, in both groups, the maternal wish for a girl was significantly more common in sibships in which all of the proband's older siblings were male. In a second sample of 103 feminine boys from Toronto, the maternal wish for a girl was significantly higher than that found in the Los Angeles sample (43.7% vs. 26.9%), but a control group was not available; as in the Los Angeles sample, the maternal wish for a girl was significantly more common in sibships in which all of the proband's older siblings were male. Implications of these findings for further study of maternal influences on boyhood femininity are discussed.  相似文献   
69.
Attentional biases for threat stimuli were assessed in high and low trait anxious subjects (n = 66) using a probe detection task. To examine the effects of trait anxiety and situational stressors, each subject was tested three times: Under no stress, laboratory-induced stress, and examination-induced stress. To evaluate the role of awareness, half the word stimuli were presented very briefly (14 msec) and masked, and the other half were presented for 500 msec without a mask. Results showed that high trait anxious subjects under exam stress showed an attentional bias towards unmasked threat stimuli compared with low trait subjects. This effect was not found under lab-induced stress, suggesting that the attentional bias for unmasked threat in high trait subjects may be a function of a prolonged stressor, rather than a transient increase in state anxiety. The results from the masked exposure condition were not predicted; high trait anxious subjects shifted attention towards the spatial location of threat words despite lack of awareness of their lexical content, but this bias was only apparent in the no-stress condition. The results are discussed in relation to recent cognitive theories of anxiety.  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