全文获取类型
收费全文 | 38306篇 |
免费 | 1448篇 |
国内免费 | 11篇 |
出版年
2020年 | 386篇 |
2019年 | 429篇 |
2018年 | 670篇 |
2017年 | 626篇 |
2016年 | 692篇 |
2015年 | 484篇 |
2014年 | 584篇 |
2013年 | 3692篇 |
2012年 | 1055篇 |
2011年 | 1102篇 |
2010年 | 697篇 |
2009年 | 589篇 |
2008年 | 1027篇 |
2007年 | 875篇 |
2006年 | 843篇 |
2005年 | 658篇 |
2004年 | 634篇 |
2003年 | 646篇 |
2002年 | 609篇 |
2001年 | 1178篇 |
2000年 | 1140篇 |
1999年 | 870篇 |
1996年 | 490篇 |
1995年 | 467篇 |
1994年 | 462篇 |
1993年 | 432篇 |
1992年 | 898篇 |
1991年 | 801篇 |
1990年 | 805篇 |
1989年 | 707篇 |
1988年 | 713篇 |
1987年 | 693篇 |
1986年 | 691篇 |
1985年 | 676篇 |
1984年 | 598篇 |
1983年 | 495篇 |
1982年 | 389篇 |
1981年 | 407篇 |
1979年 | 566篇 |
1978年 | 427篇 |
1975年 | 525篇 |
1974年 | 517篇 |
1973年 | 582篇 |
1972年 | 556篇 |
1971年 | 498篇 |
1970年 | 439篇 |
1969年 | 423篇 |
1968年 | 534篇 |
1967年 | 454篇 |
1966年 | 443篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
881.
Lingual fusion thresholds for a two-pulse stimulus were obtained at a 15-dB sensation level and a 35-dB sensation level for 15 subjects (18 to 22 yr.). The 35-dB sensation level provided better temporal resolution thresholds as well as less variable responses. 相似文献
882.
Tachistoscopic presentation of light flashes was used to test for differences in visual sensitivity among 3 groups of practitioners of Buddhist mindfulness meditation and non-meditator-controls. Meditation practitioners were able to detect light flashes of shorter duration than the non-meditators. There were no differences among the meditator groups. There were no differences among the groups in ability to discriminate between closely spaced successive light flashes. The lower detection threshold for single light flashes for the meditators may reflect an enduring increase in sensitivity, perhaps the long-term effects of the practice of mindfulness meditation on certain perceptual habit patterns. The lack of significant differences in the discrimination of successive light flashes probably reflects the resistance of other perceptual habit patterns to modification. The results support the statements found in Buddhist texts on meditation concerning the changes in perception encountered during the practice of mindfulness. 相似文献
883.
884.
885.
D M Kaplan 《The Psychoanalytic quarterly》1984,53(2):240-266
The idea of a psychopathology of fate or what had come to be called a fate neurosis has failed to retain any established place in the structure of psychoanalytic thought. The clinical observations and theoretical formulations, to which the idea of a fate neurosis answered, have been subsumed in the course of things by more fundamental and systematic conceptualizations. A review of Helene Deutsch's (1930) paper, "Hysterical Fate Neurosis," is therefore bound to be largely an excursion into an area of intellectual history. However, such history never fails to shed light on certain ongoing clinical and theoretical problems that may have lost too much to current developments in psychoanalytic thought. It is with this historical purpose that the present study of Deutsch's classic paper on a fate neurosis is undertaken. 相似文献
886.
Distraction and coping with pain 总被引:7,自引:0,他引:7
887.
The question of left hemisphere dysfunction in infantile autism 总被引:3,自引:0,他引:3
888.
889.
This paper proposes test statistics based on the likelihood ratio principle for testing equality of proportions in correlated data with additional incomplete samples. Powers of these tests are compared through Monte Carlo simulation with those of tests proposed recently by Ekbohm (based on an unbiased estimator) and Campbell (based on a Pearson-Chi-squared type statistic). Even though tests based on the maximum likelihood principle are theoretically expected to be superior to others, at least asymptotically, results from our simulations show that the gain in power could only be slight. 相似文献
890.
The effects of tobacco smoking on responses to electrical stimulation were studied according to a Method of Limits (ML) threshold analysis and a Sensory Decision Theory (SDT) analysis. For the ML procedure, Detection Threshold (DT), Pain Threshold (PT) and Tolerance Level (TL) measures were obtained. For the SDT procedure, nonparametric estimates of capacity to discriminate between stimulus intensities (P(A)) and response criterion (B) were calculated. There was no main effect of tobacco smoking on responses to electrical stimulation. Males had consistently higher ML thresholds than females in both the NS and S condition. Males also tended to increase in DT and PT after smoking. From a comparison between the effects of smoking on ML and SDT measures it was suggested that PT is related mainly to sensory factors and TL to response factors. 相似文献