全文获取类型
收费全文 | 36917篇 |
免费 | 1650篇 |
国内免费 | 28篇 |
出版年
2020年 | 454篇 |
2019年 | 467篇 |
2018年 | 744篇 |
2017年 | 695篇 |
2016年 | 725篇 |
2015年 | 510篇 |
2014年 | 642篇 |
2013年 | 2759篇 |
2012年 | 1147篇 |
2011年 | 1262篇 |
2010年 | 705篇 |
2009年 | 763篇 |
2008年 | 1028篇 |
2007年 | 1006篇 |
2006年 | 904篇 |
2005年 | 785篇 |
2004年 | 765篇 |
2003年 | 742篇 |
2002年 | 698篇 |
2001年 | 1401篇 |
2000年 | 1377篇 |
1999年 | 970篇 |
1998年 | 403篇 |
1997年 | 369篇 |
1993年 | 316篇 |
1992年 | 803篇 |
1991年 | 702篇 |
1990年 | 788篇 |
1989年 | 705篇 |
1988年 | 667篇 |
1987年 | 622篇 |
1986年 | 668篇 |
1985年 | 706篇 |
1984年 | 541篇 |
1983年 | 464篇 |
1982年 | 336篇 |
1979年 | 501篇 |
1978年 | 406篇 |
1977年 | 320篇 |
1976年 | 315篇 |
1975年 | 468篇 |
1974年 | 564篇 |
1973年 | 527篇 |
1972年 | 465篇 |
1971年 | 390篇 |
1970年 | 345篇 |
1969年 | 413篇 |
1968年 | 467篇 |
1967年 | 402篇 |
1966年 | 439篇 |
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
21.
Convergent and divergent stereo mechanisms were compared in their ability to recover structure from motion. Contrary to a recent result reported by Richards and Lieberman, no difference in their performance was found; both mechanisms appeared equally capable of supporting the perception of good structure from motion. Possible reasons for the disparate results are discussed. 相似文献
22.
23.
24.
25.
26.
P Bressan 《Perception》1987,16(5):671-675
If a few parallel horizontal rows of dots are set diagonally, like steps, across the visual field, the inner rows appear not to be horizontal but sloping up to one side; the effect holds as long as the vertical distances between the rows do not exceed a given visual angle. This illusion, described by Vicario in 1978, was never explained. An experiment is reported in which the illusion was still visible at row separations well in excess of the spatial limits originally considered, provided the stimulus elements were enlarged. The maximum illusion was obtained for length ratios (interrow distance to size of dots) identical to those which have been shown to produce the largest effects in a number of illusions of area and length. This suggests that Vicario's illusion is similar to other illusions of extent, and that it can be explained by a neural extent-coding model. 相似文献
27.
Simon P. Liversedge Kevin B. Paterson Emma L. Clayes 《The Quarterly Journal of Experimental Psychology Section A: Human Experimental Psychology》2002,55(1):225-240
We report an eye movement experiment investigating the influence of the focus operator only on syntactic processing of "long" relative clause sentences. Paterson, Liversedge, and Underwood (1999) found that readers were garden pathed by "short" reduced relative clause sentences containing the focus operator only . They argued that due to thematic differences between "short" and "long" relative clause sentences, garden path effect might not occur when "long" reduced relative clause sentences are read. Eye-tracking data show that garden path effects found during initial processing of the disambiguating verb of "long" reduced sentences without only were absent or delayed in the case of counterparts with only . We discuss our results in terms of current theories of sentence processing. 相似文献
28.
29.
30.