全文获取类型
收费全文 | 6918篇 |
免费 | 1554篇 |
出版年
2021年 | 102篇 |
2020年 | 126篇 |
2019年 | 432篇 |
2018年 | 372篇 |
2017年 | 462篇 |
2016年 | 456篇 |
2015年 | 403篇 |
2014年 | 367篇 |
2013年 | 918篇 |
2012年 | 405篇 |
2011年 | 338篇 |
2010年 | 338篇 |
2009年 | 303篇 |
2008年 | 344篇 |
2007年 | 270篇 |
2006年 | 233篇 |
2005年 | 228篇 |
2004年 | 199篇 |
2003年 | 203篇 |
2002年 | 208篇 |
2001年 | 163篇 |
2000年 | 147篇 |
1999年 | 106篇 |
1998年 | 63篇 |
1997年 | 50篇 |
1996年 | 59篇 |
1995年 | 59篇 |
1994年 | 52篇 |
1993年 | 50篇 |
1992年 | 63篇 |
1991年 | 41篇 |
1990年 | 53篇 |
1989年 | 52篇 |
1988年 | 53篇 |
1987年 | 44篇 |
1986年 | 43篇 |
1985年 | 46篇 |
1984年 | 46篇 |
1983年 | 36篇 |
1982年 | 46篇 |
1981年 | 39篇 |
1980年 | 33篇 |
1979年 | 26篇 |
1978年 | 49篇 |
1977年 | 33篇 |
1976年 | 36篇 |
1975年 | 38篇 |
1973年 | 25篇 |
1971年 | 23篇 |
1968年 | 27篇 |
排序方式: 共有8472条查询结果,搜索用时 15 毫秒
81.
The effects of unavoidable shocks on a multiple schedule having an avoidance component 总被引:1,自引:1,他引:0 下载免费PDF全文
Marcus B. Waller Patricia F. Waller 《Journal of the experimental analysis of behavior》1963,6(1):29-37
Two dogs were maintained on a multiple schedule having both a food reinforced and an avoidance component (Mult VI 1′ SΔ AvoidSS20 RS20 SΔ). The effects of superimposing an Estes-Skinner procedure for delivering unavoidable shocks on all components of the multiple schedule were observed. The buzzer-shock pairing of the Estes-Skinner procedure produced an increased rate of responding on the avoidance component of the schedule and also on the SΔ components. No persistent change in rate was observed on the food component during the pre-shock stimulus. Control performances on all components could be regained by either extinguishing or eliminating the buzzer-shock pairing. Extinction of the avoidance responding had little effect on the increased rates of responding produced by the Estes-Skinner procedure on the SΔ and avoidance extinction components and did not lead to a conditioned suppression of the food reinforced responding. Rate of responding during the pre-shock stimulus was observed to be relatively independent of changes in the maintaining schedules. Responding during the pre-shock stimulus could be conditioned and maintained after an extensive history of avoidance extinction. 相似文献
82.
83.
84.
85.
86.
87.
88.
89.
90.
Patricia M. Barbetta Ph.D. William L. Heward Ed.D. 《Journal of Behavioral Education》1993,3(3):217-233
An alternating treatments design was used to compare the effects of Active Student Response (ASR) error correction and No Response (NR) error correction during instruction of the capitals of states and countries. Three students with learning disabilities were provided one-to-one daily instruction on four sets of 14 unknown capitals (7 ASR capitals and 7 NR capitals). Student errors during instruction on ASR capitals were immediately followed by the teacher stating the capital and the student repeating it (an active student response). Errors on NR capitals were immediately followed by the teacher stating the capital while the student visually attended to a geography card with the correct capital handwritten on it (an on-task response). During instruction each of the three students correctly stated more capitals taught with ASR instruction than he or she stated with NR error correction. Results of same-day and next-day tests show that all three students learned more capitals with ASR error correction than with NR error correction The students also correctly stated more ASR error correction capitals on 1-week maintenance tests. 相似文献