全文获取类型
收费全文 | 34658篇 |
免费 | 655篇 |
国内免费 | 3篇 |
专业分类
35316篇 |
出版年
2020年 | 181篇 |
2019年 | 210篇 |
2018年 | 3767篇 |
2017年 | 3061篇 |
2016年 | 2535篇 |
2015年 | 440篇 |
2014年 | 353篇 |
2013年 | 1232篇 |
2012年 | 1042篇 |
2011年 | 2892篇 |
2010年 | 2826篇 |
2009年 | 1768篇 |
2008年 | 2149篇 |
2007年 | 2616篇 |
2006年 | 421篇 |
2005年 | 544篇 |
2004年 | 483篇 |
2003年 | 419篇 |
2002年 | 394篇 |
2001年 | 514篇 |
2000年 | 488篇 |
1999年 | 353篇 |
1998年 | 185篇 |
1997年 | 149篇 |
1996年 | 162篇 |
1995年 | 136篇 |
1993年 | 131篇 |
1992年 | 263篇 |
1991年 | 261篇 |
1990年 | 260篇 |
1989年 | 239篇 |
1988年 | 237篇 |
1987年 | 219篇 |
1986年 | 209篇 |
1985年 | 209篇 |
1984年 | 209篇 |
1983年 | 153篇 |
1982年 | 164篇 |
1981年 | 128篇 |
1979年 | 181篇 |
1975年 | 153篇 |
1974年 | 180篇 |
1973年 | 198篇 |
1972年 | 162篇 |
1971年 | 144篇 |
1970年 | 125篇 |
1969年 | 142篇 |
1968年 | 180篇 |
1967年 | 135篇 |
1966年 | 145篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
281.
Varying temporal placement of an added stimulus in a fixed-interval schedule 总被引:4,自引:4,他引:0 下载免费PDF全文
One paradigm for exploring stimulus effects on behavior is defined for steady state experiments. The paradigm is illustrated by a 60-sec fixed-interval reinforcement schedule wherein a 6-sec light is introduced into each interval. The temporal relation of this stimulus to the reinforcer is the independent variable that is systematically explored. Two experiments studied this temporal relation under two parametric conditions: (a) when the 6-sec light occurs once in each 60-sec interval, (b) when the 6-sec light occurs twice in each interval, the second time always during the 6 sec immediately preceding the reinforcer. Functions are presented showing the effect of the 6-sec light on responding at all points in the fixed-interval. 相似文献
282.
283.
284.
Mental hospital patients were reinforced for responding in a two-response operant situation. When a noise was used to punish one of the responses, all subjects shifted to the unpunished one. When the noise was then paired with positive reinforcement, the subjects responded to produce the noise. Also, a novel response was reinforced by noise in the absence of other reinforcers. This study with humans extends the findings of previous studies with animals in revealing how a punishing stimulus can acquire discriminative or conditioned reinforcing properties. 相似文献
285.
Monkeys' performance on ambiguous-cue problems 总被引:1,自引:0,他引:1
286.
Interpersonal anxiety as a function of social class 总被引:1,自引:0,他引:1
287.
J. N. Srivastava 《Psychometrika》1966,31(2):147-164
Let x be ap-component random variable having a multivariate normal distribution with covariance matrix . In this paper, we consider the problem of testing hypotheses of the formH
0: =b
11 + +b
m
m
, whereb
i
's are unknown scalars, and
i
's are a set of known and simultaneously diagonalizable matrices. This problem has both psychometric and statistical interest, and its basic theory is developed here. Besides, the problem of obtaining likelihood-ratio statistic for testingH
0 is studied, and the statistic obtained in a special case. 相似文献
288.
289.
N A Milgram 《Journal of experimental child psychology》1967,5(4):597-603
290.