全文获取类型
收费全文 | 52275篇 |
免费 | 1382篇 |
国内免费 | 19篇 |
出版年
2020年 | 447篇 |
2019年 | 487篇 |
2018年 | 4028篇 |
2017年 | 3313篇 |
2016年 | 2860篇 |
2015年 | 660篇 |
2014年 | 734篇 |
2013年 | 2852篇 |
2012年 | 1666篇 |
2011年 | 3444篇 |
2010年 | 3142篇 |
2009年 | 2219篇 |
2008年 | 2732篇 |
2007年 | 3159篇 |
2006年 | 1027篇 |
2005年 | 1095篇 |
2004年 | 1051篇 |
2003年 | 941篇 |
2002年 | 858篇 |
2001年 | 998篇 |
2000年 | 1029篇 |
1999年 | 767篇 |
1998年 | 426篇 |
1997年 | 382篇 |
1996年 | 301篇 |
1995年 | 328篇 |
1994年 | 305篇 |
1993年 | 316篇 |
1992年 | 601篇 |
1991年 | 531篇 |
1990年 | 595篇 |
1989年 | 511篇 |
1988年 | 489篇 |
1987年 | 469篇 |
1986年 | 467篇 |
1985年 | 534篇 |
1984年 | 450篇 |
1983年 | 376篇 |
1982年 | 322篇 |
1981年 | 305篇 |
1980年 | 285篇 |
1979年 | 423篇 |
1978年 | 362篇 |
1977年 | 290篇 |
1976年 | 288篇 |
1975年 | 361篇 |
1974年 | 414篇 |
1973年 | 406篇 |
1972年 | 307篇 |
1968年 | 309篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
811.
The entire surface phrase structure hierarchy of sentences influences visual scanning patterns in reading familiar material. A general eye-fixation rule predicts the pattern of adults’ eye-fixations in a study of reading predictable sentences: “fixate on the first half of phrase structure constituents.” This rule applies cumulatively at all levels of the surface phrase structure. 相似文献
812.
813.
J. P. GUILFORD 《创造性行为杂志》1967,1(1):3-14
ABSTRACT Nineteenth century science neglected creativity, and the limited twentieth century approach (to 1950) was largely anecdotal. Recently, research has multiplied, although it has involved little experimental hypothesis testing. Creativity comprises many discrete abilities which often do not correlate very much with each other, and creativity and IQ correlate substantially only at lower IQ levels. Much work has been done in developing evaluative criteria for creative scientific production, and on teaching and learning creativity. Future basic research should concern transfer recall, transformations, reclassification, elaboration, incubation, environmental conditions, and motivation. The social consequences of releasing creative abilities are potentially enormous. 相似文献
814.
815.
816.
817.
818.
819.
Sequential response effects in the white rat during conditioning and extinction on a DRL schedule,
下载免费PDF全文
![点击此处可从《Journal of the experimental analysis of behavior》网站下载免费的PDF全文](/ch/ext_images/free.gif)
D. P. Ferraro W. N. Schoenfeld A. G. Snapper 《Journal of the experimental analysis of behavior》1965,8(4):255-260
Sequential IRT data were obtained for three rats on a DRL 60-sec reinforcement schedule. It was found that first-order sequential dependencies exist under this schedule, including the partial dependence of the length of any given IRT on the length of the preceding IRT. The sequential analysis also served to extend the finding in the literature, based on frequency distributions, that the likelihood of a reinforced IRT is greater after a reinforced IRT than a non-reinforced IRT. Rapid extinction and reconditioning were obtained. 相似文献
820.
Michael D. Zeiler 《Journal of the experimental analysis of behavior》1965,8(4):263-268
Pigeons learned to respond to the middle-sized member (SD) of a set of three simultaneously presented stimuli with responses to the SD reinforced on a VI 1 schedule. They were then tested for several days with other sets of three stimuli. One procedure presented reinforcements on a VI 1 schedule during the test independent of the stimulus chosen when a reinforcement was programmed. The tests were also given under extinction conditions. With the testing carried out with extinction, preference consistently was for the test stimulus most similar in physical size to the SD. However, when the tests were with reinforcement, random responding resulted. Another effect of testing with reinforcement was an increase in incorrect responding with the training set. Such a test procedure was unsatisfactory for determining the effective aspect of the SD. The conclusion, based on the data of the extinction series, was that pigeons learned the intermediate size problem on the basis of the discrimination of absolute stimulus properties. 相似文献