全文获取类型
收费全文 | 18456篇 |
免费 | 857篇 |
国内免费 | 7篇 |
出版年
2021年 | 166篇 |
2020年 | 269篇 |
2019年 | 265篇 |
2018年 | 429篇 |
2017年 | 402篇 |
2016年 | 434篇 |
2015年 | 297篇 |
2014年 | 377篇 |
2013年 | 1496篇 |
2012年 | 707篇 |
2011年 | 698篇 |
2010年 | 451篇 |
2009年 | 340篇 |
2008年 | 617篇 |
2007年 | 575篇 |
2006年 | 531篇 |
2005年 | 457篇 |
2004年 | 381篇 |
2003年 | 326篇 |
2002年 | 358篇 |
2001年 | 691篇 |
2000年 | 705篇 |
1999年 | 478篇 |
1998年 | 184篇 |
1997年 | 176篇 |
1996年 | 173篇 |
1992年 | 370篇 |
1991年 | 351篇 |
1990年 | 366篇 |
1989年 | 311篇 |
1988年 | 293篇 |
1987年 | 289篇 |
1986年 | 257篇 |
1985年 | 263篇 |
1984年 | 241篇 |
1983年 | 207篇 |
1982年 | 157篇 |
1979年 | 221篇 |
1978年 | 176篇 |
1977年 | 148篇 |
1975年 | 190篇 |
1974年 | 234篇 |
1973年 | 231篇 |
1972年 | 183篇 |
1971年 | 182篇 |
1970年 | 148篇 |
1969年 | 176篇 |
1968年 | 212篇 |
1967年 | 188篇 |
1966年 | 158篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
12.
13.
14.
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
15.
Irene Hanson Frieze Anuka Ferligoj Tina Kogovek Tanja Rener Jasna Horvat Nataa arlija 《Psychology of women quarterly》2003,27(3):256-261
Determinants of gender-role attitudes were examined in samples of university students from Pittsburgh in the United States, Ljubljana in Slovenia, and Osijek in Croatia. Surveys including items from the Attitudes Toward Women Scale and the Neosexism Scale were administered to a total of 1,544 U.S. students, 912 Slovene students, and 996 Croatian students between the years of 1991 and 2000. As predicted, men held less egalitarian or more sexist attitudes about the appropriate roles for women and men, and those with more frequent attendance at religious services held more sexist attitudes. No changes in attitudes were found for women over time, but Slovene males were found to become more traditional over time. 相似文献
16.
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
17.
18.
19.
20.