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   1042篇
  免费   95篇
  国内免费   1篇
  2023年   15篇
  2022年   10篇
  2021年   22篇
  2020年   32篇
  2019年   38篇
  2018年   42篇
  2017年   49篇
  2016年   50篇
  2015年   43篇
  2014年   38篇
  2013年   123篇
  2012年   53篇
  2011年   44篇
  2010年   30篇
  2009年   36篇
  2008年   29篇
  2007年   28篇
  2006年   45篇
  2005年   27篇
  2004年   25篇
  2003年   22篇
  2002年   32篇
  2001年   23篇
  2000年   14篇
  1999年   10篇
  1996年   9篇
  1995年   7篇
  1994年   8篇
  1993年   9篇
  1992年   8篇
  1991年   14篇
  1990年   8篇
  1989年   7篇
  1988年   13篇
  1987年   10篇
  1986年   9篇
  1985年   11篇
  1984年   8篇
  1983年   11篇
  1982年   9篇
  1981年   9篇
  1980年   9篇
  1979年   6篇
  1978年   7篇
  1977年   9篇
  1976年   10篇
  1975年   9篇
  1974年   11篇
  1973年   9篇
  1971年   10篇
排序方式: 共有1138条查询结果,搜索用时 578 毫秒
221.
The factor structure of positive and negative social ties was studied among 246 older adults who were either recently physically disabled, recently conjugally bereaved, or matched controls. Covariance structure analyses were carried out on a network measure to determine whether positive and negative social ties represent independent domains of social experience, and to assess the degree to which their structure is invariant across groups undergoing major loss transitions. Positive and negative social ties were found to be independent and there was substantial similarity in their factor structure across the three groups. Hierarchical regression analyses revealed that, whereas positive social ties were related to psychological well-being, negative social ties were predictive of both psychological well-being and distress. These results demonstrate the importance of assessing both positive and negative ties in explaining the psychological adjustment of older adults.  相似文献   
222.
223.
Pavlovian theory provides a conceptual scheme for the examination of recent empirical data on dreaming. Consistencies are examined between these data and Pavlovian theory of the general properties of the nervous system. An equation is made between Pavlov’s excitation-inhibition continuum, the REM-NREM cycle, and the basic rest-activity cycle. Speculations, based on this equation, are made about the inter-relation between waking and sleeping behaviors. Testable hypotheses are suggested throughout the paper.  相似文献   
224.
An experiment was conducted in a skills training center with a sample of 28 Black female trainees The effects of variations in type (person- vs. achievement-oriented) and frequency (75% vs. 25%) of praise were ascertained on favorableness of selfimage and task performance. It was found that, in general, lower frequencies of praise produced more positive self-evaluations than high frequencies of praise, and that person-oriented praise was more effective than achievement-oriented praise in enhancing self-evaluation A significant interaction found for “myself as male friends see me” demonstrated that (a) at a 75 percent frequency of reinforcement, person-oriented praise was significantly more effective than performance-oriented praise, and (b) performance-focused praise delivered at a 25 percent frequency enhanced subjects' self-image significantly more than performance-oriented praise given at a 75 percent level. No significant effects were found for the accuracy-type tasks (work recognition, visual perceptiveness) On the task which involved a simple, speeded response (manual dexterity) there were significant effects (a) achievement-oriented praise was more effective than person-oriented praise, (b) a significant interaction between type and frequency of praise occurred, indicating that performance-oriented praise is most effective when given at a 25 percent level  相似文献   
225.
Contrary to previous indications, retroactive interference in long-term paired associate learning was found to be a function of acoustic similarity. Experimental groups were exposed to the A-B, A'-C paradigm where corresponding stimuli were homophones. Their retention scores were substantially and significantly lower than control groups run with an A-B, C-D paradigm. The failure of previous studies to reveal effects of acoustic similarity in this way is attributed to the use of an insufficiently high degree of similarity.  相似文献   
226.
Individuals scoring high (Type As), intermediate, or low (Type Bs) on the Jenkins Activity Survey were given an opportunity to aggress against a stranger who, previously, had either provoked or not provoked them. The opportunity to aggress (as well as all other aspects of the study) took place in the presence of (a) a high concentration, (b) a moderate concentration, or (c) a low (ambient) concentration of negative air ions. Results indicated that exposure to moderate or high levels of negative ions significantly enhanced aggression by Type A subjects, but not by other participants. In addition, we found that negative ions produced positive shifts in subjects' reported moods in the absence of provocation, but negative shifts in moods in the presence of provocation. These findings suggest that moderate or high concentrations of negative ions serve as a source of heightened activation, thus enhancing individuals' dominant reactions or tendencies in a given situation.  相似文献   
227.
228.
229.
230.
Correction     
Alex Blum 《Analysis》2001,61(269):90-90
  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