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   20616篇
  免费   8篇
  20624篇
  2022年   10篇
  2021年   10篇
  2020年   7篇
  2019年   14篇
  2018年   3489篇
  2017年   2821篇
  2016年   2253篇
  2015年   193篇
  2014年   80篇
  2013年   81篇
  2012年   561篇
  2011年   2382篇
  2010年   2511篇
  2009年   1470篇
  2008年   1695篇
  2007年   2169篇
  2006年   25篇
  2005年   211篇
  2004年   166篇
  2003年   113篇
  2002年   58篇
  2001年   29篇
  2000年   51篇
  1999年   14篇
  1998年   21篇
  1997年   18篇
  1996年   8篇
  1995年   4篇
  1994年   5篇
  1993年   4篇
  1990年   13篇
  1989年   8篇
  1982年   5篇
  1981年   4篇
  1974年   4篇
  1973年   6篇
  1970年   7篇
  1969年   4篇
  1968年   4篇
  1967年   7篇
  1966年   6篇
  1965年   9篇
  1963年   6篇
  1962年   4篇
  1961年   10篇
  1960年   6篇
  1958年   7篇
  1957年   4篇
  1956年   3篇
  1955年   6篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
While a smile can reflect felt happiness, it can also be voluntarily produced, for instance, to mask negative emotions. Masking strategies are not always perfect and traces of the negative emotion can leak. The current study examined the role of traces of anger, sadness, fear and disgust in the judgment of authenticity of smiles. Participants judged the authenticity of the smiles while their eye movements were recorded. They were also asked if the stimuli comprised another emotion and, if so, what the emotion was. Results revealed that participants were sensitive to traces of negative emotions. Variations were observed between emotions with performance being best for traces of fear and lowest for traces of anger in the eyebrows in the judgment task. However, when the presence of a negative emotion was reported, participants were less accurate in identifying fear but more accurate in identifying anger. Furthermore, variations were observed as a function of the location of the trace whether in the mouth or eyes as a function of the emotion. Traces in the eyebrows were associated with better performance than traces in the mouth for sadness but the opposite was observed for anger. The performance at the judgment task was not linked to eye movement measures or explicit knowledge of the masked emotion. Future research should explore other explanation for the variations in performance in the judgments of authenticity of masking smiles such as emotional contagion.  相似文献   
992.
According to Maslow’s (Psychol Rev 50:370–396, 1943) hierarchical theory of needs, people do not become sensitized to “higher” level needs until they have satisfied their “lower” level needs (a moderator hypothesis); until then, they are unprepared to benefit from higher-level satisfactions. But according to the self-determination theory (SDT) model, high-level psychological needs, when met, are non-contingently beneficial (a main effect-only hypothesis). In two large-N studies of Russian energy companies, we measured low-level need-satisfaction in terms of felt security and felt financial satisfaction, and measured high-level need satisfaction in terms of SDT’s basic needs of autonomy, competence, and relatedness. In both studies, both the lower level and higher level need-satisfaction sets had strong main effects upon many positive work outcomes, including intrinsic motivation, organizational commitment, and SWB. In Study 2, Maslow’s “prepared to benefit” hypothesis was supported, in that satisfaction of high-level needs had slightly larger effects on outcomes when combined with satisfaction of low-level needs. However this was not found in Study 1. Potentials for integrating the SDT and Maslow need theories are discussed.  相似文献   
993.
Race, gender, and emotionally expressive facial behavior have been associated with trait inferences in past research. However, it is unclear how interactions among these factors influence trait perceptions. In the current research, we test the roles of targets’ race, gender, and facial expression along with participants’ culture in predicting personality ratings. Caucasian and Asian-American participants rated the big-5 personality traits of either smiling or inexpressive photographs of Caucasian and Asian male and female faces. Ratings of extraversion, agreeableness, and conscientiousness differed significantly across inexpressive targets as a function of race and gender categorization and individual characteristics. Smiling was associated with reduced variation in perceptions of targets’ extraversion and agreeableness relative to ratings made of inexpressive targets. In addition, participant culture generally did not significantly impact trait ratings. Results suggest that emotionally expressive facial behavior reduces the use of information based on race or gender in forming impressions of interpersonally relevant traits.  相似文献   
994.
Emotional facial expressions provide important insights into various valenced feelings of humans. Recent cross-species neuroscientific advances offer insights into molecular foundations of mammalian affects and hence, by inference, the related emotional/affective facial expressions in humans. This is premised on deep homologies based on affective neuroscience studies of valenced primary emotional systems across species. Thus, emerging theoretical perspectives suggest that ancient cross-species emotional systems are intimately linked not only to emotional action patterns evident in all mammals, but also, by inference, distinct emotional facial expressions studied intensively in humans. Thus, the goal of the present theoretical work was to relate categories of human emotional facial expressions—e.g. especially of anger fear, joy and sadness—to respective underlying primary cross-mammalian emotional circuits. This can potentially provide coherent theoretical frameworks for the eventual molecular study of emotional facial expressions in humans.  相似文献   
995.
Using cognitive dissonance theories and self-determination theory, we explored the role of individual differences in global and contextual motivational orientations on dissonance arousal processes following spontaneous attitude–behaviour inconsistencies (ABIs). Study 1 (N = 382) showed that individual differences in global motivation relate to the frequency of ABIs and dissonance arousal across important life domains. Studies 2 (N = 282) and 3 (N = 202) showed that individual differences in contextual motivation toward the environment predict the relative frequency of ABIs and the quantity and quality of proximal motivation to compensate for ABIs in that context. Autonomous motivation was associated with a tendency to compensate for ABIs to both reduce dissonance and restore self-integrity. Controlled motivation disposed individuals to reduce dissonance to protect ego-invested self-structures, and to be indifferent to non self-threatening ABIs. Amotivation left people indifferent to ABIs. Individual differences in motivational orientations could explain why ABIs are uncomfortable and motivate people to compensate differently when they face ABIs.  相似文献   
996.
ASD and ADHD are regarded as distinct disorders in the current DSM-5. However, recent research and the RDoC initiative are recognizing considerable overlap in the clinical presentation of ASD, ADHD, and other neurodevelopmental disorders. In spite of numerous neuroimaging findings in ASD and ADHD, the extent to which either of the above views are supported remains equivocal. Here we compare structural MRI and DTI literature in ASD and ADHD. Our main findings reveal both distinct and shared neural features. Distinct expressions were in total brain volume (ASD: increased volume, ADHD: decreased volume), amygdala (ASD: overgrowth, ADHD: normal), and internal capsule (ASD: unclear, ADHD: reduced FA in DTI). Considerable overlap was noted in the corpus callosum and cerebellum (lower volume in structural MRI and decreased FA in DTI), and superior longitudinal fasciculus (reduced FA in DTI). In addition, we identify brain regions which have not been studied in depth and require more research. We discuss relationships between brain features and symptomatology. We conclude by addressing limitations of current neuroimaging research and offer approaches that account for clinical heterogeneity to better distinguish brain-behavior relationships.  相似文献   
997.
998.
When there are equally strong claimants for a scarce good, lotteries are often argued to be a fair method of allocation. This paper reproduces four of the views on the fairness of lotteries that have been presented in the literature: the distributive view; the preference view; the actual consent view; and the expressive view. It argues that these four views cannot offer plausible explanations for the fairness of lotteries. The distributive view is argued to be inadequate because, even though receiving expectations to a good is of value to the participants, this value cannot plausibly make a contribution to the satisfaction of a participant’s claim. Both the preference and actual consent views are argued to be implausible because they lead to accepting procedures as legitimate that fail to correspond with what a claim is. Finally, it is contended that the expressive view identifies a value that is relevant to respecting equal claimants, but that cannot plausibly be related to a procedure’s fairness. The paper concludes by maintaining that an equal treatment view can accept all the valid insights from these four views without needing to accept their untenable implications.  相似文献   
999.
In this paper I critically engage with Hennie Lötter’s impressive book, Poverty, Ethics and Justice. I discuss his conception of poverty, and offer an interpretation of his claim that poverty is a uniquely human scourge. I exam the various harms of poverty that Lötter discusses. I consider two reasons that he offers for why we have a moral duty to end poverty, and I argue that the reason based on what we can justify to others if we take their human dignity seriously is most compelling. Finally, I argue that Lötter overemphasizes of the moral importance of aid and downplays in the importance of the justice of institutional and structural change. I close by considering the prospects for social equality given our experience of capitalist development as a means for poverty eradication. I consider the moral importance of limits to the achievement of robust equality.  相似文献   
1000.
The European framework surrounding clinical trials on medicinal products for human use is going to change as demonstrated by the large debate at European institutional level. One of the major challenges is to overcome the lack of harmonisation of clinical trial procedures among countries. This aspect is gaining more and more importance, considering the increasing number of multicentre and multinational studies. In this work, the actual European rules governing the Clinical Trial Application have been analysed throughout the different steps including the registration of the trial in the European database; the preparation of documents to be submitted and their contents; the preparation of documents related to the information and consent process; the submission to competent bodies. Specific issues related to paediatric research and trials involving non EU/EEA countries have been addressed as well. Results reveal that the European legislation offers a well defined set of European rules covering different aspects of a Clinical Trial Application. However, these are not suitable to meet the challenges from multicentre and multinational clinical studies. A stronger set of rules, such as is available in a composite European Regulation has been adopted and is expected to harmonise practices and enable sponsors to carry out well conducted trials. But will the new regulation overcome the existing criticisms of Directive 2001/20/EC?  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