全文获取类型
收费全文 | 39785篇 |
免费 | 1616篇 |
国内免费 | 14篇 |
出版年
2020年 | 379篇 |
2019年 | 440篇 |
2018年 | 612篇 |
2017年 | 608篇 |
2016年 | 672篇 |
2015年 | 501篇 |
2014年 | 589篇 |
2013年 | 2752篇 |
2012年 | 1127篇 |
2011年 | 1102篇 |
2010年 | 697篇 |
2009年 | 669篇 |
2008年 | 985篇 |
2007年 | 971篇 |
2006年 | 850篇 |
2005年 | 814篇 |
2004年 | 776篇 |
2003年 | 707篇 |
2002年 | 720篇 |
2001年 | 1276篇 |
2000年 | 1235篇 |
1999年 | 896篇 |
1998年 | 414篇 |
1997年 | 357篇 |
1992年 | 873篇 |
1991年 | 810篇 |
1990年 | 826篇 |
1989年 | 720篇 |
1988年 | 718篇 |
1987年 | 698篇 |
1986年 | 715篇 |
1985年 | 803篇 |
1984年 | 603篇 |
1983年 | 549篇 |
1982年 | 372篇 |
1981年 | 367篇 |
1979年 | 688篇 |
1978年 | 431篇 |
1977年 | 417篇 |
1976年 | 423篇 |
1975年 | 586篇 |
1974年 | 674篇 |
1973年 | 716篇 |
1972年 | 620篇 |
1971年 | 580篇 |
1970年 | 574篇 |
1969年 | 564篇 |
1968年 | 752篇 |
1967年 | 668篇 |
1966年 | 598篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
931.
Klaus R. Scherer Robert Rosenthal Judy Koivumaki 《European journal of social psychology》1972,2(2):163-175
Differential vocal emphasis in the tape-recorded instruction reading for a standard person perception task was manipulated by mechanically raising or lowering the volume of the key words describing the success or failure response alternatives on the rating scale. In a series of three experiments, Ss exposed to success emphasis in the instructions rated the stimulus persons as more successful than did Ss exposed to failure emphasis. This trend was reversed for Ss who listened twice to the instructions. None of the Ss reported awareness of the influence attempt. 相似文献
932.
Two hundred and fifty-two brightness functions for seven simultaneously presented black, gray, and white squares on black, gray, and white backgrounds approximated power curves with positive exponents when illuminance was varied in seven steps over 1.9 log fL. Mean exponents were significantly larger for whiter vs blacker squares and for squares on the white vs the gray background. Mean exponents also increased more for squares on white than on black or gray backgrounds. Finally, a white replacing a black background elicited increasingly larger décrémentai responses as the squares varied from black to white. Jameson and Hurvich’s opponent-process theory, tested by the experiment, was not predictive. 相似文献
933.
This experiment represented an initial at tempt at comparing same-different classifications and similarity judgments of Markov histoforms sampled from three different schema families. A measure of individual stimulus variability was more strongfy related to classification responses than to judged similarity. Dichotomous responses, derived from the similarity data by imposing threshold criteria, were found to be highly similor to real classification responses when the threshold values were estimated directly from the latter; little correspondence, however, was obtained using optimal classification criteria. The results support the notion that somewhat different features are used in making classification responses and similarity judgments, and indicate the need for developing more sensitive tasks involving controlled scanning of pattem information. 相似文献
934.
Intermodal perceptual equivaience was investigated, using visual and tactual oddity discrimination and cross-modal matching-to-sample tasks. Four groups of Ss were presented with 100 problems made up of randomly derived forms from five levels of sidedness. The same quadratic relationship was observed for all tasks as a function of complexity, with optimal performance at eight sides. Comman information utilization, as indicated by intercorrelations of performance variables and by correlational analyses with differences in form measures, was not as pronounced within side classes. Evidence concerning the nature of pattern-feature usage in discrimination was obtained from graphical analyses. 相似文献
935.
Constraint redundancy (Rc) was varied in order to manipulate the statistical structure of sets of patterns. Measures of pattern features and Rc were related to the categorization by Ss who had experienced different types of preexposure to sets of patterns from the same stimulus domain. Both Rc and pattern measures were related to the categories produced by Ss in a schematic-concept-formation (SCF) task. 相似文献
936.
William R. Uttal Lynne M. Bunnell Stuart Corwin 《Attention, perception & psychophysics》1970,8(6):385-388
We report the results of a study that investigated the effects of four experimental parameters on the tachistoscopic detectability of dotted lines in a noisy background consisting of dynamic patterns of identical dots. Characteristics of the lines that were explored included dot spacing, dot numerosity, and line orientation. Dot spacing was shown to be the most powerful parameter in determining the masking effect: the closer the dots, the more easily the line was detected. Increasing the number of the dots was also effective in increasing the detectability of a line, but only up to a limit of five dots. The orientation of the line, on the other hand, did not alter its detectability. Increasing the density of the visual masking noise monotonically reduced the detectability of the line. These studies are an extension of French’s (1953, 1954) work, differing mainly in the fact that the stimulus material was presented tachistoscopically rather than in a mode that allowed prolonged (up to 5 sec) examination of the figures. Thus, they put the results in a domain in which physiological interpretations may be more critically evaluated. A comparison of the results suggests that essentially the same sorts of cognitive mechanisms are operating in the millisecond domain as in the longer exposures. This suggests that simple neurological models utilizing the concept of feature filters or detectors may be being prematurely applied to relatively complex perceptual processes. 相似文献
937.
938.
939.
940.