全文获取类型
收费全文 | 10115篇 |
免费 | 350篇 |
国内免费 | 6篇 |
出版年
2021年 | 66篇 |
2020年 | 119篇 |
2019年 | 134篇 |
2018年 | 194篇 |
2017年 | 211篇 |
2016年 | 253篇 |
2015年 | 174篇 |
2014年 | 192篇 |
2013年 | 1013篇 |
2012年 | 374篇 |
2011年 | 391篇 |
2010年 | 256篇 |
2009年 | 292篇 |
2008年 | 404篇 |
2007年 | 441篇 |
2006年 | 412篇 |
2005年 | 356篇 |
2004年 | 338篇 |
2003年 | 406篇 |
2002年 | 366篇 |
2001年 | 149篇 |
2000年 | 148篇 |
1999年 | 158篇 |
1998年 | 139篇 |
1997年 | 148篇 |
1996年 | 143篇 |
1995年 | 149篇 |
1994年 | 115篇 |
1993年 | 127篇 |
1992年 | 122篇 |
1991年 | 110篇 |
1990年 | 93篇 |
1989年 | 102篇 |
1988年 | 112篇 |
1987年 | 114篇 |
1986年 | 94篇 |
1985年 | 115篇 |
1984年 | 144篇 |
1983年 | 132篇 |
1982年 | 127篇 |
1981年 | 116篇 |
1980年 | 131篇 |
1979年 | 124篇 |
1978年 | 130篇 |
1977年 | 122篇 |
1976年 | 144篇 |
1975年 | 99篇 |
1974年 | 109篇 |
1973年 | 100篇 |
1972年 | 61篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
141.
Joseph J. Siev Richard E. Petty Borja Paredes Pablo Briñol 《Social and Personality Psychology Compass》2023,17(8):e12767
People generally intend to act more on beliefs and attitudes about which they have greater certainty. However, we introduce a boundary condition to the positive association between certainty and behavioral intentions—behavioral extremity. Uncertainty about a threatening issue like COVID-19 can be disconcerting, and we propose that uncertain people cope in part through increased openness to extreme actions like accepting risky medical treatments and aggression toward those defying mitigation policies. Testing this, we compiled and analyzed all the data on certainty about COVID-19 mitigation policies and willingness to engage in mitigation-related behaviors that our lab collected during the pandemic (6 samples, 20 behaviors, Ns up to 1496). External ratings of the behaviors' extremity moderated certainty-willingness associations: whereas greater certainty was associated with increased willingness to engage in moderate behaviors (the typical result), lower certainty was associated with increased willingness to engage in extreme behaviors, especially among those worried about becoming ill. 相似文献
142.
The Johns Hopkins University, Baltimore, Maryland 21218 Pairs of letters were presented 4 deg left or right of fixation, and Ss were asked to indicate as quickly as possible whether the letters in a pair were the same or different. Reaction times for “different” responses were faster when stimuli were in the left visual field than in the right, but reaction times for “same” responses were faster when stimuli were in the right visual field than in the left. These results may indicate that the right hemisphere is better specialized for difference detection, while the left hemisphere is better specialized for sameness detection. 相似文献
143.
144.
145.
146.
147.
Two experiments were run to investigate the locus of selectivity in a visual memory task involving differential payoff for letters correctly recalled: Major variables consisted of value instructions given before or after the exposure of a display, the ratio of high to low value, and exposure duration. The results showed that Ss make more correct reports of higher value than of lesser value, whether value instructions are given before or after the display. Furthermore, overall performance and extent of selectivity increase with increasing exposure time, but more for the before than the after conditions of instruction. These results suggest that selectivity occurs both during perception and retention and during recall. 相似文献
148.
William E. Vandament Richard G. Burright Rollin R. Fessenden William H. Barker 《Behavior research methods》1970,2(6):290-296
Tables of sequences of two-class events are presented for use in programming psychological experiments in which behavior on trial n may be a function of the events of trials n ? 1, n ? 2, and/or n ? 3. Various factors related to schedule generation are discussed, i.e., restrictions on trial-block length which accompany sequential balance, interrelationships of trial blocks in the multiblock experiment, relationships between run length and r-tuple occurrences, and alternation behavior. Following a consideration of various methods of schedule generation for the two-class experiment, it was concluded that no method can result in schedules that possess all properties considered desirable in psychological experiments. However, the present sequences allow for sequential balance and analysis, and thus should prove useful in producing schedules in some contexts that are standard with regard to sequential influences. 相似文献
149.
M. B. Sterman J. J. Lynch M. T. Orne D. Paskewitz J. Costello N. Nicolov O. Diankov M. Popova E. Tsvetanska Robert G. Grenell J. J. Izquierdo V. H. Mark Joseph Germana N. Zill William P. Paré Joseph E. O. Newton George C. Offutt Walter Ehrlich Joseph E. D. Newton Julij Tosef J. Perez-Cruet Chester R. Wilpizeski John F. Lontz Andrew Livingston Joseph W. Cullen Samuel A. Corson Herman R. Weed Elizabeth O. Corson O. D. Murphree Paul N. Morgan Ruth Jarman J. Antal T. A. Ban J. V. Ananth H. E. Lehmann A. Ulric Moore Richard H. Barnes Wilson G. Pond 《Integrative psychological & behavioral science》1970,5(3):185-193
150.
Richard Schlegel 《Synthese》1970,21(1):65-82
The statistical aspects of quantum explanation are intrinsic to quantum physics; individual quantum events are created in the interactions associated with observation and are not describable by predictive theory. The superposition principle shows the essential difference between quantum and non-quantum physics, and the principle is exemplified in the classic single-photon two-slit interference experiment. Recently Mandel and Pfleegor have done an experiment somewhat similar to the optical single-photon experiment but with two independently operated lasers; interference is obtained even with beam intensity so small that only one photon is in the apparatus at a time. The result can be understood in terms of the superposition of states; or, in terms of the Uncertainty Principle, which is found to forbid the determination of which of the two lasers is the source of a given photon (if conditions for interference are to obtain). The Mandel-Pfleegor experiment gives a physical argument against the continuous localization of a photon that is assumed in the hidden variable theories and therefore gives further support for the generally accepted view that an observed entity (observed state) is created in the observation event. This aspect of quantum physics implies a subjectivism on the level of individual quantum-level occurrences, since there is in quantum theory no basis for asserting the existence of the event independently of observation of it. Extension of this subjectivism to large scale, non-quantum phenomena falls within the principles of quantum theory; counter considerations that argue against such an extension are noted. 相似文献