全文获取类型
收费全文 | 82857篇 |
免费 | 3334篇 |
国内免费 | 29篇 |
出版年
2020年 | 919篇 |
2019年 | 1087篇 |
2018年 | 1557篇 |
2017年 | 1553篇 |
2016年 | 1659篇 |
2015年 | 1175篇 |
2014年 | 1421篇 |
2013年 | 7389篇 |
2012年 | 2607篇 |
2011年 | 2649篇 |
2010年 | 1621篇 |
2009年 | 1621篇 |
2008年 | 2340篇 |
2007年 | 2234篇 |
2006年 | 2058篇 |
2005年 | 1731篇 |
2004年 | 1771篇 |
2003年 | 1732篇 |
2002年 | 1643篇 |
2001年 | 2698篇 |
2000年 | 2537篇 |
1999年 | 1943篇 |
1998年 | 913篇 |
1997年 | 794篇 |
1996年 | 960篇 |
1995年 | 884篇 |
1994年 | 868篇 |
1993年 | 819篇 |
1992年 | 1738篇 |
1991年 | 1576篇 |
1990年 | 1584篇 |
1989年 | 1458篇 |
1988年 | 1445篇 |
1987年 | 1358篇 |
1986年 | 1326篇 |
1985年 | 1390篇 |
1984年 | 1179篇 |
1983年 | 1000篇 |
1979年 | 1189篇 |
1978年 | 862篇 |
1975年 | 1022篇 |
1974年 | 1090篇 |
1973年 | 1160篇 |
1972年 | 1027篇 |
1971年 | 933篇 |
1970年 | 805篇 |
1969年 | 786篇 |
1968年 | 1018篇 |
1967年 | 891篇 |
1966年 | 848篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
911.
The purpose of this investigation was to determine if there were differences between regular education and emotionally disturbed early adolescents with respect to self-concept, body image, and selected uses of clothing. A questionnaire was administered to 74 regular education students from three middle schools. An additional 27 students labeled emotionally disturbed were surveyed from one of the schools. The questionnaire contained existing measures of self-concept and body cathexis and a revised clothing scale developed by the authors. Analysis of the data using t tests revealed significant differences between the groups with regard to self-concept and body image. In both cases, regular education students perceived themselves more positively than did those labeled emotionally disturbed. Factor analysis of the clothing-use measure gave rise to five distinct factors, one of which revealed a significant difference between the groups when analyzed by t tests. This factor, "dependence," examined the emotional effects of the use of clothing on individuals, such as the ability to influence mood. The emotionally disturbed students were less likely to use clothing to influence mood than were the regular education students. The results of this investigation lend further credence to the importance of self-concept in the education curriculum, and imply that the usual aspects of the curriculum that deal with self-concept may be served better by helping the individual become more realistic and self-accepting. The use of clothing as a tool to enhance self-concept merits further investigation. 相似文献
912.
This study investigated the relationship between occult participation, substance abuse, and level of self-esteem in adolescents. Data were collected from 50 adolescents who ranged in age from 12 to 19 years and who spoke English as their primary language. The combined group of adolescents consisted of 25 clinical and 25 nonclinical youth. Participants completed a three-part questionnaire package which included Rosenberg's Self-Esteem Scale, the Adolescent Magic Questionnaire, and the Drug and Alcohol Assessment Scale. Results indicated that adolescent substance abuse and occult participation were significantly related. High and low occult participation groups were determined, and significant differences were found between the high versus low occult groups when compared on the primary variables of self-esteem and substance abuse. Significant differences were also noted when comparing the high versus low occult groups with various psychosocial developmental variables. Included is a discussion of the impact of occult participation on the psychosocial elements of adolescent self-esteem, self-concept, tolerance for deviance, and religious involvement. 相似文献
913.
In this experiment adult subjects copied three types of material (letters, reversed letters and geometric shapes) with and without sight of the hand and the writing trace. Without vision the number of movement segments decreased and the sequence and direction of movements were altered. This means that subjects did not use a fixed stored representation to produce items nor did they obey the rules of Goodnow and Levine's (1973) grammar of action. When spatial location is made more difficult by the removal of vision, movement production is simplified to reduce the number of relocations required. The use of consistent directions of movement depends on the ability to use visual control of spatial location. 相似文献
914.
The Social Phobia and Anxiety Inventory (SPAI) is an empirically derived self-report inventory developed as a specific measure of social phobia. The current investigation included two studies. The first examined the correlation of the SPAI with daily social behavior of a clinic sample of social phobics. The results indicated that the SPAI provides a reasonable indication of the distress experienced during daily social encounters in three dimensions: behavior, cognitions, and overall distress. The second study examined the validity of the SPAI with reference to the somatic response and avoidance behavior of social phobics. The results indicated that the somatic items of the SPAI are related to the somatic response of social phobics and that performance on the SPAI is associated with avoidance behavior in an anxiety-producing task. 相似文献
915.
Restrained eaters are rapidly habituating sensation seekers 总被引:1,自引:0,他引:1
Several authors have pointed to similarities between eating disorders and addictive behaviors. In earlier studies, addicts were found to score high on the Sensation Seeking Scale (SSS) and to habituate rapidly to neutral stimuli. In this study, we found experimental support for an addiction model of eating disorders: restrained eaters also scored significantly higher on the Sensation Seeking Scale and also habituated significantly quicker to a series of neutral stimuli than unrestrained eaters. No clear evidence was found for the hypothesis that restrained eaters score lower on measurements of anxiety. It is hypothesized that rapid habituation promotes sensation seeking, which may be manifested in excessive consumption of either drugs or food. Restraint may be a strategy to prevent negative consequences of sensation seeking and excessive consumption. The model is related to earlier experimental findings. 相似文献
916.
Research-structured vs clinically flexible versions of social learning-based marital therapy 总被引:1,自引:0,他引:1
N S Jacobson K B Schmaling A Holtzworth-Munroe J L Katt L F Wood V M Follette 《Behaviour research and therapy》1989,27(2):173-180
The purpose of this study was to compare our structured research-based version of marital therapy from a social learning perspective with a clinically flexible version of the same treatment where treatment plans were individually-based and there was no specific number of treatment sessions. Thirty distressed married couples were randomly assigned to one of these two treatments. Assessment of outcome was based on global marital satisfaction, spouse reports of functioning in specific areas, and direct observational measures of communication. At posttest there were no differences in efficacy between structured and flexible treatments, although both treatments led to significant improvements. At a 6-month follow-up couples treated with the structured format were more likely to have deteriorated and flexibly treated couples were more likely to have maintained their treatment gains. 相似文献
917.
Interparental conflict and adolescent problem behavior: an examination of mechanisms 总被引:1,自引:0,他引:1
The purpose of the present study was to examine several competing hypotheses which have been utilized to explain the negative relationship between interparental conflict and child/adolescent problems. These mechanisms of operation have included modelling, genetic transmission, disrupted parenting, the role of perceptual/appraisal processes of the conflict, and an inhibition hypothesis. One hundred and forty-two young adolescents and their mothers served as subjects. Eighty were from intact families and 62 from recently divorced families. Data were collected from the perspective of the adolescent, mother, behavioral observer, and social studies teacher. The results indicated that intact and divorced samples had to be considered separately as different pathways contributed to adolescent behavior problems in the two samples. For externalizing problems, a direct path between interparental conflict and problem behavior existed for the divorced sample whereas an indirect path through the adolescent's perceptions of the conflict existed for the intact sample. The different context in which the interparental conflict occurred for the two samples was offered as an explanation of this difference. For internalizing problems a significant direct path existed between conflict and problem behavior for both samples; however, the indirect paths through the adolescent's perceptions and through poor parenting skills contributed only for the divorced sample. The results suggest that various mechanisms appear to operate in influencing how interparental conflict influences behavior problems of young adolescents. Both the type of problem examined and the marital status of the parents appear important in determining the relative impact of the mechanisms. Implications for the behavior therapist are noted. 相似文献
918.
D W Massaro 《Cognitive psychology》1989,21(3):398-421
The TRACE model of speech perception (McClelland & Elman, 1986) is contrasted with a fuzzy logical model of perception (FLMP) (Oden & Massaro, 1978). The central question is how the models account for the influence of multiple sources of information on perceptual judgment. Although the two models can make somewhat similar predictions, the assumptions underlying the models are fundamentally different. The TRACE model is built around the concept of interactive activation, whereas the FLMP is structured in terms of the integration of independent sources of information. The models are tested against test results of an experiment involving the independent manipulation of bottom-up and top-down sources of information. Using a signal detection framework, sensitivity and bias measures of performance can be computed. The TRACE model predicts that top-down influences from the word level influence sensitivity at the phoneme level, whereas the FLMP does not. The empirical results of a study involving the influence of phonological context and segmental information on the perceptual recognition of a speech segment are best described without any assumed changes in sensitivity. To date, not only is a mechanism of interactive activation not necessary to describe speech perception, it is shown to be wrong when instantiated in the TRACE model. 相似文献
919.
Can we imagine how objects look from other viewpoints? 总被引:2,自引:0,他引:2
Many psychologists who study cognition believe that perception achieves object-centered representations that make it possible to extract representations of how the object would appear from differing viewpoints. Others believe we can achieve representations of how an object would appear by a process of visualization or mental rotation. We report experiments in which the subject tries to imagine how three-dimensional novel wire objects would appear from positions other than the one they are in. Subjects are unable to perform this task unless they make use of strategies that circumvent the process of visualization. It is suggested that the linear increase in time required to succeed in mental rotation tasks as a function of the angular discrepancy between the figures compared is the result of increasing difficulty rather than of the time required for rotation. 相似文献
920.
The field of infant perceptual development has relied heavily on the preferential-looking and habituation paradigms. Despite the obvious advantages of employing standardized methodologies, there is a need to study how perceptual variables give rise to and guide action beginning in the neonatal period. It is argued here that, in the first 5 months of life, it is important to distinguish reflexive patterns of movement from voluntary and cortically controlled patterns. Some criteria are defined. This paper describes three experiments which utilized movement counters to record developmental changes in the frequency and synchrony of limb movements in infants under 5 months. The results show that there is a general increase in frequency of limb movements from 1 to 5 months, but with a plateau or even a decrease in activity from the middle of the third month to the end of the fourth month. It was also demonstrated that synchrony scores (co-activation) for pairs of limbs showed significant increases from 1 month to 5 months. Finally, in all three experiments the presentation of an attractive toy resulted in suppression of activity. The results of the three experiments are interpreted to measure a gradual increase in cortically controlled movement patterns. 相似文献