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   6909篇
  免费   371篇
  国内免费   8篇
  2023年   78篇
  2022年   109篇
  2021年   125篇
  2020年   173篇
  2019年   175篇
  2018年   330篇
  2017年   313篇
  2016年   303篇
  2015年   186篇
  2014年   213篇
  2013年   901篇
  2012年   497篇
  2011年   463篇
  2010年   307篇
  2009年   215篇
  2008年   370篇
  2007年   329篇
  2006年   287篇
  2005年   258篇
  2004年   173篇
  2003年   182篇
  2002年   171篇
  2001年   85篇
  2000年   112篇
  1999年   73篇
  1998年   48篇
  1997年   36篇
  1996年   33篇
  1995年   30篇
  1994年   22篇
  1993年   25篇
  1992年   45篇
  1991年   28篇
  1990年   35篇
  1989年   32篇
  1988年   38篇
  1987年   32篇
  1985年   23篇
  1984年   28篇
  1983年   19篇
  1982年   17篇
  1979年   25篇
  1978年   20篇
  1976年   21篇
  1973年   20篇
  1972年   17篇
  1971年   18篇
  1970年   21篇
  1968年   20篇
  1967年   17篇
排序方式: 共有7288条查询结果,搜索用时 15 毫秒
911.
Extensive research has investigated societal and behavioral consequences of social group affiliation and identification but has been relatively silent on the role of perception in intergroup relations. We propose the perceptual model of intergroup relations to conceptualize how intergroup relations are grounded in perception. We review the growing literature on how intergroup dynamics shape perception across different sensory modalities and argue that these perceptual processes mediate intergroup relations. The model provides a starting point for social psychologists to study perception as a function of social group dynamics and for perception researchers to consider social influences. We highlight several gaps in the literature and outline areas for future research. Uncovering the role of perception in intergroup relations offers novel insights into the construction of shared reality and may help devise new and unique interventions targeted at the perceptual level.  相似文献   
912.
Although creativity has drawn the attention of researchers during the past century, collaborative processes have barely been investigated. In this article, the collective dimension of a creative process is investigated, based on a dynamic and ecological approach that includes an affective component. Dynamic means that the creative process is no longer considered as sequential, and ecological, that the individuals were observed in their normal place of creation. This study was conducted with science students that were required to carry on a research project during 15 weeks in small groups. The results tend to confirm the hypothesis of a nonlinear process, with important variations of the affects depending on the stage. Moreover, each group creative process seems to be specific. The relation between the social functioning of the group and the process is also discussed. Finally, because it is a part of any teamwork, verbalization is proposed as a new powerful tool to investigate creative process.  相似文献   
913.
Spinal muscular atrophy (SMA) is an autosomal recessive neuromuscular condition with degeneration of the anterior horn cells in the spinal column. Five SMA subtypes exist with classification dependent upon the motor milestones achieved. Study of the SMN1 (survival motor neuron) and SMN2 genes as well as the concepts of the “2?+?0” carriers, gene conversion, de novo mutations and intragenic mutations allow for a better understanding of SMA. Detailing the carrier and diagnostic testing options further deepens the genetic counselor’s knowledge of SMA. A review of care guidelines and research options is included as this information gives a patient a well-rounded view of SMA. Although SMA is most commonly associated with the SMN1 gene, a number of spinal muscular atrophies not caused by genetic changes in this gene may be included as differential diagnoses until confirmatory testing can be completed. SMA is a complex condition requiring a detailed knowledge on the genetic counselor’s part in order to explain the disorder to the patient with clarity thus facilitating increased communication and decision making guidance with the patient.  相似文献   
914.
Psychological flexibility is the main outcome of acceptance commitment therapy. Insight into the usefulness of measuring psychological flexibility is an important step to enable studies on the effectiveness of acceptance commitment therapy in middle-aged children (8–10 years). For this purpose, we examined the factor structure, the construct validity and the reliability of the Avoidance and Fusion Questionnaire for Youth. The Avoidance and Fusion Questionnaire for Youth taps psychological inflexibility (the opposite of psychological flexibility) in children and adolescents. Although the questionnaire has been extensively validated in older children, this is not the case for middle-aged children. The Avoidance and Fusion Questionnaire for Youth contains 17 items and is constituted of the subscales cognitive fusion, experiential avoidance and behavioral ineffectiveness. A shortened 8-item version also exists, the Avoidance and Fusion Questionnaire for Youth-8, which does not distinguish between these subscales. We performed a confirmatory factor analysis. Additionally, we assessed the relationship between psychological flexibility and child anxiety. Children, aged 8–10 years, were recruited via regular primary schools. Of the 459 approached children, 267 (58?%) parents signed informed consents for their children (Age: M?=?9.18; SD?=?.79; Sex: n boys?=?137, 51?%). Children completed the questionnaires during regular classes. In this sample, the 17-item version of the Avoidance and Fusion Questionnaire for Youth was less appropriate for measuring psychological inflexibility than the 8-item version. Furthermore, we found a significant positive relationship between psychological inflexibility and child anxiety. We argue that acceptance commitment therapy would be an interesting candidate for intervening early on in dysfunctional child anxiety, as acceptance commitment therapy’s cognitive elements require cognitive skills that children are likely to master early on.  相似文献   
915.
The present study examines whether early experiences of threat, subordination and devaluation with family influence adolescents’ negative emotional states and subsequently deliberate self-harm; and if this effect is conditioned by daily peer hassles. The sample consisted of 441 adolescents (57.6 % female) with ages between 13 and 18 years old from middle and high schools. Participants completed self-report instruments measuring early memories of threat, subordination and devaluation, daily peer hassles, negative affect and deliberate self-harm behaviors. Results from conditional process analysis showed that adolescents who feel devalued and experience threat and submission within family tend to endorse high levels of negative affect, which in turn accounts for increased endorsements on deliberate self-harm. Moreover, the impact of negative affect on deliberate self-harm is amplified by the presence of moderate and high levels of daily peer hassles. This study suggests the relevance of assessing and intervening on type of emotional memories (i.e., threat, subordination and devaluation), daily disruptions with peers and negative emotional states with adolescents who self-injure. These findings may be useful in the development of preventive and intervention programs for reducing deliberate self-harm in adolescence.  相似文献   
916.
Two theoretically based parent training programs, delivered in real-world settings by the social services, were examined in this randomized controlled trial for effectiveness in reducing adolescents’ antisocial behavior and substance use. Two hundred and thirty-seven (237) adolescents in ages between 12 and 18 and their parents were assigned to one of two programs or to a wait-list control condition. The programs were the nine weekly group sessions program Comet 12–18 (Swedish Parent Management Training Program) and the six weekly ParentSteps (Swedish shortened version by Strengthening Families Program 10–14). Outcome measures were antisocial behavior, substance use, and delinquency, and psychosocial dysfunction. Data based on adolescents’ and parents’ ratings of the adolescents’ problem behavior at baseline and 6 months later were analyzed with repeated measures ANVOA, Logistic regression, and Kruskal–Wallis H test. The results showed that parents’ ratings of adolescents’ antisocial behaviors decreased significantly over time, but no time by group effect emerged. No program effects were found in the adolescents’ self-reported antisocial behavior, delinquency, or psychosocial functioning. A threefold risk of illicit drug use was found in both intervention groups. The results suggest that neither Comet nor ParentSteps had beneficial effects on adolescent’s antisocial or delinquent behavior, or on alcohol use. The only significant group difference found was a threefold risk of drug use in the intervention adolescents at follow-up, but for several reasons this finding should be interpreted with caution. Trial registration number: ISRCTN76141538.  相似文献   
917.
This article deals with a modern disease of academic science that consists of an enormous increase in the number of scientific publications without a corresponding advance of knowledge. Findings are sliced as thin as salami and submitted to different journals to produce more papers. If we consider academic papers as a kind of scientific ‘currency’ that is backed by gold bullion in the central bank of ‘true’ science, then we are witnessing an article-inflation phenomenon, a scientometric bubble that is most harmful for science and promotes an unethical and antiscientific culture among researchers. The main problem behind the scenes is that the impact factor is used as a proxy for quality. Therefore, not only for convenience, but also based on ethical principles of scientific research, we adhere to the San Francisco Declaration on Research Assessment when it emphasizes “the need to eliminate the use of journal-based metrics in funding, appointment and promotion considerations; and the need to assess research on its own merits rather on the journal in which the research is published”. Our message is mainly addressed to the funding agencies and universities that award tenures or grants and manage research programmes, especially in developing countries. The message is also addressed to well-established scientists who have the power to change things when they participate in committees for grants and jobs.  相似文献   
918.
The idea of far transfer effects in the cognitive sciences has received much attention in recent years. One domain where far transfer effects have frequently been reported is music education, with the prevailing idea that music practice entails an increase in cognitive ability (IQ). While cross‐sectional studies consistently find significant associations between music practice and IQ, randomized controlled trials, however, report mixed results. An alternative to the hypothesis of cognitive transfer effects is that some underlying factors, such as shared genes, influence practice behaviour and IQ causing associations on the phenotypic level. Here we explored the hypothesis of far transfer within the framework of music practice. A co‐twin control design combined with classical twin‐modelling based on a sample of more than 10,500 twins was used to explore causal associations between music practice and IQ as well as underlying genetic and environmental influences. As expected, phenotypic associations were moderate (= 0.11 and r = 0.10 for males and females, respectively). However, the relationship disappeared when controlling for genetic and shared environmental influences using the co‐twin control method, indicating that a highly practiced twin did not have higher IQ than the untrained co‐twin. In line with that finding, the relationship between practice and IQ was mostly due to shared genetic influences. Findings strongly suggest that associations between music practice and IQ in the general population are non‐causal in nature. The implications of the present findings for research on plasticity, modularity, and transfer are discussed.  相似文献   
919.
The aim of this cross-lagged study was to provide new insight into the interplay between workplace bullying, basic psychological needs (for autonomy, competence, and relatedness), and employee functioning. Based on new developments in self-determination theory (SDT) research, we simultaneously examined the temporal relationships between workplace bullying, need satisfaction and frustration, as well as two indicators of psychological functioning: life satisfaction and psychosomatic complaints. Data were collected at two time points over a 12-month period from a sample of 508 Canadian nurses. Results suggest that bullying not only negatively predicted satisfaction for the needs of autonomy and competence, it actively frustrated all three needs. Frustration of the needs for competence and relatedness as well as satisfaction of the need for relatedness also predicted the psychological functioning of employees exposed to bullying behaviour over time. Taken together, the results suggest that evaluating need frustration provides in-depth insight into the detrimental effects of bullying on employees’ psychological inner resources and may explain the impoverishment of employees’ psychological functioning when confronted with bullying behaviour. The implications for the bullying and SDT literature are discussed.  相似文献   
920.
The present research investigated the notion of fit between supervisors’ power tactics and subordinates’ need for cognitive closure (NFCC) on subordinates’ burnout and stress. Subordinates who tend to avoid ambiguity (high NFCC) were expected to experience relatively less burnout (Study 1) and stress (Study 2) if their supervisors utilize harsh (controlling and unequivocal) power tactics and more burnout and stress if their supervisors utilize soft (autonomy-supportive and equivocal) power tactics. In contrast, it was expected that subordinates who avoid firm and binding conclusions (low NFCC) would experience relatively less burnout and stress if their supervisors use soft power tactics and more burnout and stress if they use harsh power tactics. Two studies conducted in diverse organizational settings supported these hypotheses. Collectively, these results support the conclusion that soft (vs. harsh) power tactics are not always associated with better (vs. worse) organizational outcomes. Theoretical and practical implications for organizations are discussed.  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