全文获取类型
收费全文 | 17678篇 |
免费 | 772篇 |
国内免费 | 8篇 |
出版年
2020年 | 215篇 |
2019年 | 232篇 |
2018年 | 342篇 |
2017年 | 301篇 |
2016年 | 335篇 |
2015年 | 266篇 |
2014年 | 312篇 |
2013年 | 1327篇 |
2012年 | 569篇 |
2011年 | 524篇 |
2010年 | 371篇 |
2009年 | 328篇 |
2008年 | 476篇 |
2007年 | 505篇 |
2006年 | 437篇 |
2005年 | 408篇 |
2004年 | 378篇 |
2003年 | 313篇 |
2002年 | 345篇 |
2001年 | 777篇 |
2000年 | 766篇 |
1999年 | 517篇 |
1998年 | 183篇 |
1997年 | 190篇 |
1996年 | 182篇 |
1994年 | 150篇 |
1992年 | 395篇 |
1991年 | 390篇 |
1990年 | 381篇 |
1989年 | 338篇 |
1988年 | 328篇 |
1987年 | 307篇 |
1986年 | 273篇 |
1985年 | 280篇 |
1984年 | 259篇 |
1983年 | 220篇 |
1982年 | 169篇 |
1979年 | 240篇 |
1978年 | 181篇 |
1977年 | 164篇 |
1975年 | 203篇 |
1974年 | 245篇 |
1973年 | 242篇 |
1972年 | 190篇 |
1971年 | 197篇 |
1970年 | 161篇 |
1969年 | 185篇 |
1968年 | 227篇 |
1967年 | 204篇 |
1966年 | 167篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
The three reliability and two construct validity studies presented here represent the first psychometric research on the commercially successful and popular Hartman Color Code Personality Profile. The reliability studies found high reliability after 3 and 6 weeks. The construct validity studies substantiated that the Color Code assesses some personality traits. The magnitude of the error variance suggests caution, however, in using the Color Code classifications at the individual level. 相似文献
12.
John Y. H. Bai Sarah Cowie Anne C. Macaskill Douglas Elliffe Christopher A. Podlesnik 《Journal of the experimental analysis of behavior》2020,113(2):363-389
It is widely assumed that reinforcers are biologically relevant stimuli, or stimuli that have been associated with biologically relevant stimuli. However, brief, arbitrary stimuli have also been reported to have reinforcement-like effects, despite being unrelated to biologically relevant stimuli like food. The present study explored the potential reinforcement-like effects of brief stimuli across 5 experiments. In Experiments 1 through 4, pigeon subjects responded for food reinforcement and brief stimulus presentations in a 2-component multiple schedule. Neither baseline response rates nor resistance to change during disruption tests were systematically greater in a component with versus without brief stimulus presentations. Increasing the rate and duration of brief stimulus presentations in Experiment 4 did not reveal reinforcement-like effects when compared directly with food. In Experiment 5, pigeons chose between independent terminal links in a concurrent-chains procedure. Across conditions, varying the location, duration, and rate of brief stimulus presentations in the terminal links had no systematic effects on preference. In contrast, varying rates of food reinforcers resulted in large and reliable shifts in preference. Therefore, the present study found no systematic evidence that brief stimuli unrelated to food reliably increase response rates, resistance to change, or preference. These data demonstrate the value of systematic replication, and a behavioral momentum approach to assessing potential reinforcement-like effects. 相似文献
13.
14.
15.
16.
The ability to make egocentric distance estimates of a single point source of light, seen in darkness and without the cues of changing size and luminance, was investigated in sixteen observers. The attenuation required to maintain constant luminance, when the target was viewed from different distances, was shown to follow the inverse square law providing the angle subtended by the light was less than 20 s arc. Distance changes were also simulated by means of a split mirror which produced vergence cues, or by test lenses to provide accommodation cues. Over the range 0.5 to 9.2 m distance estimates were surprisingly accurate, although there was some overestimation of near and underestimation of far distances. Most observers made good judgements when only convergence cues were varied, whereas no observers made consistently good judgements when only accommodation cues were varied. The difficulties are discussed in terms of the accommodation-convergence link. When distance was simulated by changing convergence and accommodation cues, estimates were not as good as when real distance was changed. Since good estimates were made with brief target exposures, these judgements were not based on subsequent convergence or accommodation changes. It is suggested that the metric or reference against which the apparently absolute judgements were made was the efferent demand signal associated with a 'resting' position of convergence in darkness. 相似文献
17.
18.
T. J. Roper R. A. Boakes 《The Quarterly Journal of Experimental Psychology Section B: Comparative and Physiological Psychology》1981,33(2):137-140
TOATES, F. Animal Behaviour: A Systems Approach. Chichester: John Wiley and Sons. 1980. Pp. 299. Hardback £17. Paper back £6.40 ISBN 0 471 27724.
DICKINSON, A. Contemporary Animal Learning Theory. Cambridge: University Press. 1980. Pp. 177. Hardback £12.50. Paperback £3.95. ISBN 0 521 23469 7. 相似文献
DICKINSON, A. Contemporary Animal Learning Theory. Cambridge: University Press. 1980. Pp. 177. Hardback £12.50. Paperback £3.95. ISBN 0 521 23469 7. 相似文献
19.
20.