全文获取类型
收费全文 | 23532篇 |
免费 | 520篇 |
国内免费 | 4篇 |
专业分类
24056篇 |
出版年
2020年 | 308篇 |
2019年 | 297篇 |
2018年 | 481篇 |
2017年 | 415篇 |
2016年 | 462篇 |
2015年 | 312篇 |
2014年 | 429篇 |
2013年 | 1728篇 |
2012年 | 724篇 |
2011年 | 759篇 |
2010年 | 432篇 |
2009年 | 501篇 |
2008年 | 668篇 |
2007年 | 636篇 |
2006年 | 573篇 |
2005年 | 508篇 |
2004年 | 515篇 |
2003年 | 482篇 |
2002年 | 434篇 |
2001年 | 808篇 |
2000年 | 804篇 |
1999年 | 593篇 |
1998年 | 242篇 |
1997年 | 217篇 |
1993年 | 197篇 |
1992年 | 485篇 |
1991年 | 428篇 |
1990年 | 490篇 |
1989年 | 409篇 |
1988年 | 388篇 |
1987年 | 367篇 |
1986年 | 391篇 |
1985年 | 440篇 |
1984年 | 340篇 |
1983年 | 287篇 |
1982年 | 224篇 |
1979年 | 326篇 |
1978年 | 260篇 |
1977年 | 205篇 |
1976年 | 209篇 |
1975年 | 301篇 |
1974年 | 349篇 |
1973年 | 354篇 |
1972年 | 275篇 |
1971年 | 242篇 |
1970年 | 209篇 |
1969年 | 229篇 |
1968年 | 291篇 |
1967年 | 251篇 |
1966年 | 274篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
821.
The peer review process, whether formally applied in publication and grant review, or informally, such as exchange of ideas in scientific and professional newsgroups, has sparked controversy. Writers in this area agree that scholarly reviews that are inappropriate in tone are not uncommon. Indeed, commentators have suggested rules and guidelines that can be used to improve the review process and to make reviewers more accountable. In this paper, we examine the relevance and impact of ethical codes on the conduct of peer review. It is our contention that the peer review process can be improved, not by a new set of rules but through closer attention to the ethical principles to which we, as psychologists, already subscribe. 相似文献
822.
823.
We investigated the regulation of sequential action using a new paradigm. Participants learned a sequence of seven stimulus categories and then monitored for them during successive displays. All displays were instances of these categories, presented in pseudorandom order. On each trial, participants monitored for an instance of Category 1, pressed a key on a computer keyboard, then monitored for an instance of Category 2, pressed a key on the keyboard, and so on for all seven categories. Thus, a perfect trial contained exactly seven responses. Intrusion errors were classified as a function of ordinal distance from the current serial position ( n ). Fewer intrusion errors were made at near serial positions than at far ones, suggesting a gradient of lateral inhibition. In addition, more intrusions were made on n + 1 categories than n − 1 categories, suggesting greater availability of intended than completed goals. In accord with current models of sequential action, the results indicate lateral and self-inhibition as important mechanisms in regulation of sequential action. 相似文献
824.
825.
826.
Salkovskis PM Wroe AL Gledhill A Morrison N Forrester E Richards C Reynolds M Thorpe S 《Behaviour research and therapy》2000,38(4):347-372
The cognitive-behavioural theory of Obsessive Compulsive Disorder (OCD) proposes that a key factor influencing obsessional behaviour is the way in which the intrusive cognitions are interpreted. The present paper reports an investigation of links between clinical symptoms (of anxiety, depression and obsessionality) and responsibility beliefs. These beliefs include not only measures of general responsibility attitudes (assumptions) but also more specific responsibility appraisals consequent on intrusive cognitions. The characteristics of two new questionnaires specifically designed to measure these beliefs were assessed in patients suffering from Obsessive Compulsive Disorder, in patients suffering from other anxiety disorders and in non-clinical controls. The scales measuring negative beliefs about responsibility were found to have good reliability and internal consistency. Comparisons between criterion groups indicate considerable specificity for both assumptions and appraisals with respect to OCD. There was also good evidence of specificity in the association between responsibility cognitions and obsessional symptoms across groups, and that this association was not a consequence of links with anxiety or depressive symptoms. Although the two measures were correlated, they each made unique contributions to the prediction of obsessional symptoms. Overall, the results are consistent with the hypothesis that responsibility beliefs are important in the experience of obsessional problems. 相似文献
827.
We investigated the organization and components of psychomotor abilities by administering a diverse set of cognitive and psychomotor tasks to a group of recent high school graduates (N = 161). Confirmatory factor analyses identified two psychomotor factors: a general factor associated with all psychomotor tests and an orthogonal psychomotor learning factor associated exclusively with practiced psychomotor tests. Path analyses suggested that the general psychomotor factor could be largely accounted for by two cognitive factors, general working-memory capacity (r = .67) and an orthogonal time estimation factor (r = .32). Most of the psychomotor learning factor variance was unique, but psychomotor learning was somewhat related to processing speed (r = .49). We conclude that initial psychomotor performance is constrained by working-memory limits and the ability to keep track of time. Practiced psychomotor skill is additionally limited by processing speed, consistent with the literature on the development of process automaticity. The Discussion addresses (a) the small dimensionality of the psychomotor abilities space, (b) our discovery of the importance of time estimation and other cognitive factors in psychomotor learning, and (c) the changing nature of psychomotor skill with practice. 相似文献
828.
Armeli S Carney MA Tennen H Affleck G O'Neil TP 《Journal of personality and social psychology》2000,78(5):979-994
The authors used a daily diary methodology to examine over 60 days how the within-person associations among event stress, alcohol consumption, and desire to drink varied as a function of gender, positive and negative alcohol-outcome expectancies, and avoidant coping in a sample of 88 regular drinkers. Multilevel regression analyses indicated that men who more strongly anticipated positive outcomes or a sense of carelessness from drinking drank relatively more on stressful days compared with low-stress days. Similar results were found predicting desire to drink. Men who anticipated greater impairment from drinking drank relatively less on stressful days. In general, these effects did not hold for women. Little evidence was found for the predicted effects for avoidant coping style, and some results showed that avoidant coping style buffered the exacerbating effects of careless unconcern expectancies. 相似文献
829.
ERPs and behavioral inhibition in a Go/No-go task in children with attention-deficit hyperactivity disorder 总被引:3,自引:0,他引:3
Yong-Liang G Robaey P Karayanidis F Bourassa M Pelletier G Geoffroy G 《Brain and cognition》2000,43(1-3):215-220
In order to study the behavioral responses and the brain inhibition process in children with attention-deficit hyperactivity disorder (ADHD), Event-Related Potentials (ERPs) were recorded from 30 scalp electrodes in 21 ADHD and 21 normal boys during performing a Go/No-go task. ADHD children made fewer correct responses to both Go and No-go stimuli than normal controls. The frontal N2 amplitude was larger for No-go stimuli than Go stimuli in both groups, reflecting inhibition of responding. Smaller N2 amplitudes to No-go stimuli were found in ADHD children, but only when the Go/No-go task was performed after a first stimulus-response compatibility (SRC) task. In addition, the controls exhibited a prolonged N2 only when the Go/No-go task was performed second. However, the ADHD subjects exhibited this prolonged N2 when the task was first, but not when it was second. These results suggest an inhibitory regulation problem rather an inhibition deficit in ADHD children. 相似文献
830.
Observers were presented with displays simulating a 3-D environment with obstacles in the path of motion. During the trial, observer motion decelerated at a constant rate and was followed by a blackout prior to the end of the display. On some trials the rate of deceleration resulted in stopping before the collision, whereas on other trials the rate of deceleration resulted in a collision with the obstacles. The observer's task was to detect which trials simulated an impending collision. Proportion of collision judgments was greater for older as compared with younger observers when a collision was not simulated. Older observers showed less sensitivity to detect collisions than younger observers did, particularly at high speeds. The age-dependent results are discussed in terms of analyses based on tau and constant deceleration. The results suggest that increased accident rates for older drivers may be due to an inability to detect collisions at high speeds. 相似文献