全文获取类型
收费全文 | 70870篇 |
免费 | 2878篇 |
国内免费 | 30篇 |
专业分类
73778篇 |
出版年
2020年 | 735篇 |
2019年 | 963篇 |
2018年 | 1270篇 |
2017年 | 1317篇 |
2016年 | 1412篇 |
2015年 | 1014篇 |
2014年 | 1215篇 |
2013年 | 5635篇 |
2012年 | 2241篇 |
2011年 | 2447篇 |
2010年 | 1509篇 |
2009年 | 1492篇 |
2008年 | 2138篇 |
2007年 | 2142篇 |
2006年 | 2028篇 |
2005年 | 1797篇 |
2004年 | 1664篇 |
2003年 | 1618篇 |
2002年 | 1693篇 |
2001年 | 2187篇 |
2000年 | 2133篇 |
1999年 | 1654篇 |
1998年 | 853篇 |
1997年 | 794篇 |
1996年 | 763篇 |
1995年 | 683篇 |
1993年 | 681篇 |
1992年 | 1356篇 |
1991年 | 1271篇 |
1990年 | 1243篇 |
1989年 | 1123篇 |
1988年 | 1088篇 |
1987年 | 1057篇 |
1986年 | 1144篇 |
1985年 | 1185篇 |
1984年 | 1014篇 |
1983年 | 916篇 |
1981年 | 679篇 |
1979年 | 1027篇 |
1978年 | 778篇 |
1975年 | 840篇 |
1974年 | 908篇 |
1973年 | 981篇 |
1972年 | 818篇 |
1971年 | 765篇 |
1970年 | 673篇 |
1969年 | 705篇 |
1968年 | 883篇 |
1967年 | 798篇 |
1966年 | 679篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
911.
The perception of continuous curves in dot stimuli 总被引:1,自引:0,他引:1
Two categorisation experiments are reported in which the perceptual phenomenon that some simple arrays of discrete dots appear as a continuous curve whereas others are perceived as an angular contour or as consisting of separate groups of dots was investigated. Triplets of dots were presented in the first experiment, and complete or incomplete regular dot polygons (ie dots positioned on the vertices of imaginary regular polygons) in the second. In both experiments the perception of a curve versus an angle was determined mainly by the relative orientations of the dots, ie by the angles between successive virtual lines, whereas the lengths of the virtual lines had relatively little influence. In experiment 2 the number of displayed dots was shown to be a second independent factor for perceiving continuity. These results are in agreement with results from experiments on dipole textures discrimination, and suggest the psychological existence and importance of virtual lines in the visual processing of dot stimuli. 相似文献
912.
J C Bartlett M A Gernsbacher R E Till 《Journal of experimental psychology. Learning, memory, and cognition》1987,13(1):27-35
In a study of recognition memory for pictures, we observed an asymmetry in classifying test items as "same" versus "different" in left-right orientation: Identical copies of previously viewed items were classified more accurately than left-right reversals of those items. Response bias could not explain this asymmetry, and, moreover, correct "same" and "different" classifications were independently manipulable: Whereas repetition of input pictures (one vs. two presentations) affected primarily correct "same" classifications, retention interval (3 hr vs. 1 week) affected primarily correct "different" classifications. In addition, repetition but not retention interval affected judgments that previously seen pictures (both identical and reversed) were "old". These and additional findings supported a dual-process hypothesis that links "same" classifications to high familiarity, and "different" classifications to conscious sampling of images of previously viewed pictures. 相似文献
913.
David E. Sandberg Anke A. Ehrhardt Claude A. Mellins Susan E. Ince Heino F. L. Meyer-Bahlburg 《Sex roles》1987,16(11-12):649-668
The term pioneer is used for girls aspiring to male-dominated careers. This longitudinal study assesses the career choices of 68 middle-class girls during childhood (8–13 years, Phase I) and again during adolescence (13–18 years, Phase II), and investigates the relation between pioneering career choice and personal and family characteristics. Subjects were originally selected for exposure vs nonexposure to exogenous hormones during pregnancy. In childhood, pioneers were somewhat older, were more often persistent tomboys, had higher IQs, and had parents with higher educational attainment. In adolescence, paternal education was the only variable that showed the same relation to career choice. Adolescent girls who had wanted to get married at the time of the childhood assessment were now less likely to choose pioneering careers. Adolescent pioneers also had higher educational aspirations than nonpioneers and less likely anticipated being married within ten years than nonpioneers. A number of statistically borderline relationships were also observed: pioneers had somewhat fewer older brothers than nonpioneers, less often came from homes in which traditional femininity was stressed, and more frequently had mothers who had worked outside the home throughout their daughters' school years than mothers of nonpioneers. Prenatal exposure to exogenous sex hormones was not related to career choice during either childhood or adolescence. 相似文献
914.
SEX DIFFERENCES IN MORAL JUDGMENTS? A TEST OF GILLIGAN'S THEORY 总被引:1,自引:0,他引:1
915.
Tacit knowledge in managerial success 总被引:2,自引:0,他引:2
916.
The effects of computerized office and factory automation are examined. An open systems framework is used to organize this literature. The review suggests that the benefits of technology are derived from theintermediate effects of the technology on organizational processes (the task structure, personnel system, formal structure, and informal organization). Thus, it is misleading to examine thedirect effects of computerized technology on organizational outcomes such as profits and satisfaction. Some of the effects of technology on the organizational processes are inevitable (e.g., changes in informal communication patterns). Others are determined less by the technology than by management decisions. The key to achieving success with computerized technology is matching changes in organizational processes to each other, as well as to the technology and the larger environment of the organization.Ann Majchrzak is currently Associate Professor of Human Factors at the Institute of Safety and Systems Management at the University of Southern California. She has recently written two books on the subject of technological change. Katherine J. Klein is an Assistant Professor of Industrial and Organizational Psychology in the Psychology Department of the University of Maryland at College Park. 相似文献
917.
Sixteen student volunteers were administered a placebo and 50 mg. of chlorpromazine in tablet form, on separate occasions,
two hours before testing. The three tests measured dichotic listening performance, lateral eye movements while answering questions
about spatial location and verbal meaning, and lateralized facial expression while relating pleasant and unpleasant life incidents.
Results showed that chlorpromazine increased the number of trials showing an ear advantage in dichotic listening. Chlorpromazine
reduced lateral and increased vertical eye movements in response to the questions about spatial location and verbal meaning.
Under the placebo both negative and positive emotions were expressed more in the left face. Although chlorpromazine did not
affect this lateralization of negative emotions, the expression of positive emotions occurred equally often on the two sides
of the face under chlorpromazine. Results may be related to an effect of chlorpromazine on the asymmetrical dopamine pathways
of the brain. It is suggested that the findings may be related to a left hemisphere deficit in schizophrenia. 相似文献
918.
919.
R. M. Foxx Martin J. McMorrow Michele Hernandez Martha Kyle Ron G. Bittle 《Behavioral Interventions》1987,2(2):77-88
A social skills training program was evaluated with emotionally disturbed adolescent inpatients. The targeted social skills required an action or reaction within six skill areas. The program was adapted from a commercially available social skills training game that features the use of response specific feedback, self-monitoring, individualized reinforcers, and individualized performance criteria. A peer conducted the baseline and posttraining sessions while the training was conducted by an adult who had no previous interactive history with the subjects. A multiple baseline design across groups demonstrated that the program increased appropriate responding in all skill areas and that these effects generalized during the posttraining peer conducted sessions. A generalization test indicated that the subjects used their newly learned skills with a novel adult outside the training setting. The program appears quite applicable to emotionally disturbed adolescents since it targets skills in a variety of areas and employs standardized procedures to enhance replicability. 相似文献
920.