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   5354篇
  免费   1484篇
  2021年   90篇
  2020年   113篇
  2019年   405篇
  2018年   314篇
  2017年   433篇
  2016年   414篇
  2015年   382篇
  2014年   341篇
  2013年   719篇
  2012年   336篇
  2011年   277篇
  2010年   284篇
  2009年   269篇
  2008年   279篇
  2007年   187篇
  2006年   185篇
  2005年   177篇
  2004年   151篇
  2003年   141篇
  2002年   162篇
  2001年   118篇
  2000年   120篇
  1999年   83篇
  1998年   35篇
  1997年   30篇
  1996年   29篇
  1994年   20篇
  1993年   25篇
  1992年   47篇
  1991年   33篇
  1990年   39篇
  1989年   25篇
  1988年   36篇
  1987年   35篇
  1986年   19篇
  1985年   29篇
  1984年   22篇
  1983年   20篇
  1980年   17篇
  1979年   34篇
  1977年   17篇
  1976年   28篇
  1975年   22篇
  1974年   20篇
  1973年   20篇
  1972年   20篇
  1971年   23篇
  1968年   27篇
  1967年   18篇
  1966年   19篇
排序方式: 共有6838条查询结果,搜索用时 15 毫秒
991.
GABA‐A receptor is a transmembrane hetero‐oligomeric protein which consists of five subunits, the combination of which confers unique pharmacological properties to the receptor. It is well‐known that the GABAergic system is involved in the modulation of aggression. However, the role of α5/GABA‐A receptors has not been explored. In this study, we examined the effect of L‐655,708 (0.625‐5 mg/kg), a selective ligand for the benzodiazepine site of GABA‐A receptors which contain the α5 subunit, on agonistic behavior elicited by isolation in male mice. Individually housed mice were exposed to an anosmic “standard opponent” 30 min after drug administration, and the encounters were videotaped and evaluated using an ethologically based analysis. L‐655,708 (5 mg/kg) exhibited an ethopharmacological profile characterized by a marked reduction of the time spent in offensive behavior (threat and attack) without affecting immobility, accompanied by a significant increase of avoidance/flee and nonsocial exploration behaviors, suggesting that the antiaggressive effect of the drug is unselective. Overall, this behavioral profile might indicate the existence of an anxiogenic‐like activity of L‐655,708 in mice. Aggr. Behav. 30:319–325, 2004. © 2004 Wiley‐Liss, Inc.  相似文献   
992.
A survey evaluating the generation and use of passwords revealed that students have 8.18 password uses. With 4.45 different passwords to cover these functions, the average password has 1.84 applications. Two thirds of passwords are designed around one's personal characteristics, with most of the remainder relating to relatives, friends or lovers. Proper names and birthdays are the primary information used in constructing passwords, accounting for about half of all password constructions. Almost all respondents reuse passwords, and about two thirds of password uses are duplications. Passwords have been forgotten by a third of respondents, and over half keep a written record of them. We found empirical confirmation of some ‘bad password practices’ discussed in the literature, and provide suggestions for password construction and use. Copyright © 2004 John Wiley & Sons, Ltd.  相似文献   
993.
Because of burgeoning participation by children in forensic situations there is significant concern about children's memory for stressful events. Influence of timing of the first interview and interview frequency on long‐term recall were evaluated by comparing three groups of 3‐ to 9‐year‐olds 1 year after an injury requiring emergency room treatment. One group had one interview, a year after injury; another group had two interviews, immediately and a year later; the third group had three interviews, immediately, 6 months and a year after injury. The type of event and timing of the initial interview influenced completeness and accuracy of recall after 1 year. All children showed extensive recall but having an immediate interview was associated with greater completeness and accuracy for 3–4‐year‐olds but not older children. This suggests a social influence: a highly structured and organized early interview may have beneficial effects on memory for preschoolers. Implications for questioning and testimony are discussed. Copyright © 2004 John Wiley & Sons, Ltd.  相似文献   
994.
In this essay I question an assumption of Card's, which seems to place the (Kantian'style) ethical in a directive relationship with respect to the political. I call attention to the rupture between the two as a marker of modernity and suggest that the political is not only a sphere of power but also a value‐sedimented field, with the values in question developing historically as in the case of liberal democracy.  相似文献   
995.
996.
Research on willingness to make marginal investments (e.g., the escalation and sunk cost literatures) has often focused on project completion decisions, such as the “radar‐blank plane.” This paper discusses a fundamentally different type of marginal investment decision, that of couples deciding whether to continue infertility treatment in the face of repeated failures. Two experiments based on this context show that when people face multiple independent chances to achieve a valued goal but are unsure about chances of success, premature quitting or “de‐escalation” is the norm. Repeated negative feedback appears to induce individuals to see each successive failure as more and more diagnostic. As a result, even a short series of failed attempts evokes beliefs that future attempts will also fail. These emergent expectations of failure, generated by causal attribution processes, associative learning, and/or discounting of ambiguous information, appear very compelling and induce people to forgo profitable marginal investments. Copyright © 2004 John Wiley & Sons, Ltd.  相似文献   
997.
Preference reversal is a systematic change in the preference order between options when different response methods are used (e.g., choice vs. judgment). The present study focuses on procedures used to elicit preferences according to an evaluability hypothesis. Two experiments compared joint vs. separate evaluations and explicit vs. non‐explicit joint evaluations. Subjects had to express preferences between high‐variance gambles (HVGs) and low‐variance gambles (LVGs) either by choosing one gamble to play in a lottery or by assigning gambles minimum selling prices. We show that HVGs are preferred in both choice and pricing conditions when gambles are evaluated separately, and LVGs are preferred in both choice and selling conditions when gambles are evaluated in pairs: i.e., when the evaluation mode is held constant, classic preference reversal disappears. These results support the evaluability hypothesis, and suggest that preferences depend on whether subjects are allowed to compare the options they are asked to choose from or judge, independently of the nature of the scale (i.e., attractiveness vs. minimum selling price) they are required to adopt. Copyright © 2004 John Wiley & Sons, Ltd.  相似文献   
998.
Reliable data on the relationships between situational and dispositional coping strategies are sparse. In order to address this gap in the literature, this study examined the determinants and adaptational outcomes of both types of coping. Two hundred and thirty‐three students completed, along with measures of situational and dispositional coping, measures of personality, cognitive appraisals, and psychological distress, the latter variable being evaluated concurrently and prospectively (10 weeks). Results showed that personality shared as much variance with situational as with dispositional coping, but the patterns of relationships were rather different. In addition, cognitive appraisals were found to add significant incremental validity in predicting situational coping beyond trait coping, but primary appraisals were redundant with personality traits, in particular neuroticism. Finally, in spite of the significant amount of variance shared between the two types of coping, they both accounted for individual differences in concomitant and prospective psychological distress, and the relation between dispositional coping and distress was partially mediated by situational coping. The implications of these findings for understanding the relationships between the two types of coping strategy are discussed. Copyright © 2004 John Wiley & Sons, Ltd.  相似文献   
999.
1000.
This study explores the equivalence of web‐based administration with no local supervision and traditional paper‐and‐pencil supervised versions of OPQ32i (the ipsative format version of the Occupational Personality Questionnaire). Samples of data were collected from a range of client projects and matched in terms of industry sector, assessment purpose (selection or development) and candidate category (graduate or managerial/professional). The analysis indicates that lack of local supervision in high‐stakes situations has little if any impact on scale scores. At worst, some scales appear to show shifts of less than quarter of an SD, with most scales showing little change, if any. Analyses in terms of the Big Five show differences of less than .2 of an SD. Scale reliabilities and scale covariances appear to be unaffected by the differences between the supervised and unsupervised administration conditions.  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