全文获取类型
收费全文 | 80458篇 |
免费 | 3310篇 |
国内免费 | 37篇 |
出版年
2020年 | 901篇 |
2019年 | 1102篇 |
2018年 | 1563篇 |
2017年 | 1633篇 |
2016年 | 1650篇 |
2015年 | 1201篇 |
2014年 | 1411篇 |
2013年 | 6797篇 |
2012年 | 2599篇 |
2011年 | 2692篇 |
2010年 | 1666篇 |
2009年 | 1678篇 |
2008年 | 2366篇 |
2007年 | 2274篇 |
2006年 | 2105篇 |
2005年 | 1771篇 |
2004年 | 1752篇 |
2003年 | 1726篇 |
2002年 | 1619篇 |
2001年 | 2734篇 |
2000年 | 2608篇 |
1999年 | 1929篇 |
1998年 | 919篇 |
1997年 | 767篇 |
1996年 | 841篇 |
1995年 | 761篇 |
1994年 | 763篇 |
1993年 | 743篇 |
1992年 | 1616篇 |
1991年 | 1507篇 |
1990年 | 1482篇 |
1989年 | 1399篇 |
1988年 | 1374篇 |
1987年 | 1298篇 |
1986年 | 1261篇 |
1985年 | 1361篇 |
1984年 | 1094篇 |
1983年 | 918篇 |
1979年 | 1118篇 |
1978年 | 838篇 |
1977年 | 731篇 |
1975年 | 936篇 |
1974年 | 1026篇 |
1973年 | 1095篇 |
1972年 | 910篇 |
1971年 | 816篇 |
1969年 | 739篇 |
1968年 | 929篇 |
1967年 | 798篇 |
1966年 | 831篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
911.
Newell KM 《Journal of motor behavior》1989,21(1):92-96
One of the significant limitations of the motor control and skill acquisition domain is that the theories, models, and hypotheses are, in most cases, task specific. Many lines of theorizing fail to hold up under even small changes in task constraints, although clearly the field does have some robust phenomena. It is proposed that a broader consideration of the role of task constraints, which is grounded in the methodology of nonlinear dynamics, may help to formulate a more general action theory of coordination and control. 相似文献
912.
In comparative anatomical studies of the shoulder, the humeral retractors are often grouped together as propulsive muscles, which are important in the propulsive stroke of the forelimb during quadrupedal locomotion. Electromyographic (EMG) analyses of these muscles in opossums, cats, and dogs in general have confirmed such conclusions. An EMG study of chimpanzee shoulder muscles during knuckle-walking found, however, that the humeral retractors are either inactive or perform a function unrelated to propulsion (Larson & Stern, 1987). This contrast in muscle recruitment patterns between chimpanzees and more "typical" mammalian quadrupeds was attributed to the derived morphology of the chimpanzee shoulder. The present study examines the activity patterns of the humeral retractors in the vervet monkey, a primate more closely resembling nonprimate mammals in its shoulder morphology. The results of this EMG analysis show that despite the significant differences in anatomy between chimpanzees and vervets, the two species display very similar muscle recruitment patterns during quadrupedalism, and there is evidence for this same pattern in other species of primates. These differences in muscle activity patterns between primates and nonprimate mammals may be related to changes in the neurological control of locomotion in primates due to the evolutionary development of manipulative abilities in the primate forelimb. 相似文献
913.
D L Schacter J F Kihlstrom L C Kihlstrom M B Berren 《Journal of abnormal psychology》1989,98(4):508-514
Previous research on multiple personality disorder (MPD) has been concerned with between-personalities amnesia, and little attention has been paid to within-personality memory function. This study examined the autobiographical memory of a multiple personality patient, I.C., with cueing procedures that have proven useful in previous studies of normal and abnormal memory. Results indicated that I.C. was able to retrieve autobiographical episodes from the recent past, although her performance differed in several respects from that of matched controls. The study also revealed a striking deficit in I.C.'s autobiographical memory for childhood: She was unable to recall a single episode from prior to the age of 10 in response to various retrieval cues, whereas control subjects had no difficulty recalling numerous childhood episodes. This phenomenon of extended childhood amnesia has not been reported previously in studies of MPD. 相似文献
914.
Examined relapse rates in those individuals who have experienced an episode of unipolar depression as a function of the number of previous episodes, gender, age at onset of the episode (less than 40 vs. greater than 40), time since a previous episode, and depression level at time of interview. From of 6,742 participants, 2,046 were interviewed; of these, 1,130 had at least one, 513 reported a second and 173 reported a third episode. The probability for relapse was positively related to number of previous episodes, being female, depression level at time of interview, but not to age at onset (less than 40 vs. greater than 40). Women were also more likely to have more severe episodes. Participants with elevated depression symptoms reported a greater number of previous episodes. Following the first episode, there was a decline in hazard rate for men but not women; following the second episode, there was no change in vulnerability for men; for women, the results were ambiguous. 相似文献
915.
Painting Group Portraits: Studying Life Outcomes for Aggressive and Withdrawn Children 总被引:1,自引:0,他引:1
Aggression and social withdrawal have long been of interest to personality psychologists. The present article presents a longitudinal study of the development of children selected from a community sample who were high on aggression and withdrawal. The selection of outcome variables is discussed, and outcomes during adolescence are described. For both males and females, high aggressiveness was predictive of low intelligence, poor school achievement, and psychiatric problems. For females, high aggressiveness was also predictive of general health problems. High social withdrawal was predictive of poor school achievement. Females who were high on withdrawal also had an elevated rate of abortions. Individuals who were high on both aggression and withdrawal had relatively poor social competence, had general problems with behavior, had low intelligence, and were performing poorly in school. 相似文献
916.
Is dependence on phonological information in children's reading a product of instructional approach? 总被引:1,自引:0,他引:1
Eight-year-old British children were found to be less accurate at rejecting pseudohomophones than ordinary nonwords in a lexical decision task, but 8-year-old New Zealand children did not show this effect. A subsequent homophone decision task showed that this difference was not due to the New Zealand children being unable to distinguish pseudohomophones from other nonwords. The New Zealand children, however, were less accurate than the British children in pronouncing the pseudohomophones they had identified. It was argued that the British children tended to sound out the items before making a choice in the lexical decision task, which gave salience to phonological rather than visual information, resulting in increased errors to the pseudohomophones. It was concluded that where the British children showed this dependency on use of phonological information it was a product of the teaching approach they had experienced. 相似文献
917.
918.
Agreeable fancy or disagreeable truth? Reconciling self-enhancement and self-verification 总被引:6,自引:0,他引:6
Three studies asked why people sometimes seek positive feedback (self-enhance) and sometimes seek subjectively accurate feedback (self-verify). Consistent with self-enhancement theory, people with low self-esteem as well as those with high self-esteem indicated that they preferred feedback pertaining to their positive rather than negative self-views. Consistent with self-verification theory, the very people who sought favorable feedback pertaining to their positive self-conceptions sought unfavorable feedback pertaining to their negative self-views, regardless of their level of global self-esteem. Apparently, although all people prefer to seek feedback regarding their positive self-views, when they seek feedback regarding their negative self-views, they seek unfavorable feedback. Whether people self-enhance or self-verify thus seems to be determined by the positivity of the relevant self-conceptions rather than their level of self-esteem or the type of person they are. 相似文献
919.
Evidence for terror management theory: I. The effects of mortality salience on reactions to those who violate or uphold cultural values 总被引:8,自引:0,他引:8
A Rosenblatt J Greenberg S Solomon T Pyszczynski D Lyon 《Journal of personality and social psychology》1989,57(4):681-690
On the basis of terror management theory, it was hypothesized that when mortality is made salient, Ss would respond especially positively toward those who uphold cultural values and especially negatively toward those who violate cultural values. In Experiment 1, judges recommended especially harsh bonds for a prostitute when mortality was made salient. Experiment 2 replicated this finding with student Ss and demonstrated that it occurs only among Ss with relatively negative attitudes toward prostitution. Experiment 3 demonstrated that mortality salience also leads to larger reward recommendations for a hero who upheld cultural values. Experiments 4 and 5 showed that the mortality salience effect does not result from heightened self-awareness or physiological arousal. Experiment 6 replicated the punishment effect with a different mortality salience manipulation. Implications for the role of fear of death in social behavior are discussed. 相似文献
920.
Rater bias in the EASI temperament scales: a twin study 总被引:1,自引:0,他引:1
Under trait theory, ratings may be modeled as a function of the temperament of the child and the bias of the rater. Two linear structural equation models are described, one for mutual self- and partner ratings, and one for multiple ratings of related individuals. Application of the first model to EASI temperament data collected from spouses rating each other shows moderate agreement between raters and little rating bias. Spouse pairs agree moderately when rating their twin children, but there is significantly rater bias, with greater bias for monozygotic than for dizygotic twins. MLE's of heritability are approximately .5 for all temperament scales with no common environmental variance. Results are discussed with reference to trait validity, the person-situation debate, halo effects, and stereotyping. Questionnaire development using ratings on family members permits increased rater agreement and reduced rater bias. 相似文献