全文获取类型
收费全文 | 72112篇 |
免费 | 2833篇 |
国内免费 | 37篇 |
出版年
2020年 | 744篇 |
2019年 | 905篇 |
2018年 | 1326篇 |
2017年 | 1336篇 |
2016年 | 1396篇 |
2015年 | 956篇 |
2014年 | 1177篇 |
2013年 | 5968篇 |
2012年 | 2113篇 |
2011年 | 2296篇 |
2010年 | 1402篇 |
2009年 | 1397篇 |
2008年 | 2125篇 |
2007年 | 2054篇 |
2006年 | 1855篇 |
2005年 | 1653篇 |
2004年 | 1618篇 |
2003年 | 1511篇 |
2002年 | 1572篇 |
2001年 | 2222篇 |
2000年 | 2119篇 |
1999年 | 1655篇 |
1998年 | 874篇 |
1997年 | 786篇 |
1996年 | 740篇 |
1995年 | 732篇 |
1993年 | 682篇 |
1992年 | 1383篇 |
1991年 | 1310篇 |
1990年 | 1277篇 |
1989年 | 1157篇 |
1988年 | 1151篇 |
1987年 | 1111篇 |
1986年 | 1165篇 |
1985年 | 1205篇 |
1984年 | 977篇 |
1983年 | 847篇 |
1979年 | 987篇 |
1978年 | 764篇 |
1976年 | 693篇 |
1975年 | 878篇 |
1974年 | 986篇 |
1973年 | 978篇 |
1972年 | 839篇 |
1971年 | 782篇 |
1970年 | 724篇 |
1969年 | 751篇 |
1968年 | 913篇 |
1967年 | 863篇 |
1966年 | 820篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
151.
We examined whether four personality traits—trait aggression, trait industriousness, trait deceptiveness, and trait self-control—were differentially related to 11 narrow-bandwidth CWB facets: (a) property destruction, (b) inappropriate verbal actions, (c) inappropriate physical actions, (d) poor attendance, (e) poor quality work, (f) unsafe behavior, (g) theft and related behavior, (h) misuse of information, (i) misuse of time and resources, (j) alcohol use, and (k) drug use. Based on responses from 404 employed participants recruited using Mechanical Turk, we found that each narrow-bandwidth personality trait often yielded stronger relationships with overall CWB than with narrow-bandwidth CWB facets. 相似文献
152.
153.
154.
155.
156.
157.
158.
G. C. Preston A. Dickinson N. J. Mackintosh 《The Quarterly Journal of Experimental Psychology Section B: Comparative and Physiological Psychology》1986,38(2):217-237
Three experiments used a discriminated operant procedure to study conditional discrimination learning in rats. The first experiment showed that rats were capable of learning a biconditional discrimination in which two contexts served as conditional cues signalling the reinforcement contingencies associated with two discriminative stimuli. The discrimination was learned equally well when one discriminative stimulus signalled food, the other its absence, and when one stimulus signalled food, the other extinction plus mild footshock.
In Experiment 2 it was shown that prior training on such a conditional discrimination enhanced the subsequent context specificity of simple conditioning relative to control groups of animals for whom the prior training had not been conditional. Experiment 3 showed that a reversal of the significance of one pair of discriminative stimuli produced no spontaneous reversal in performance to a second, target, pair.
The pattern of results is best accounted for by an analysis of contextual conditional discrimination learning in terms of stimulus configurations and offers no support for the notion that rats may learn a general conditional rule or set. 相似文献
In Experiment 2 it was shown that prior training on such a conditional discrimination enhanced the subsequent context specificity of simple conditioning relative to control groups of animals for whom the prior training had not been conditional. Experiment 3 showed that a reversal of the significance of one pair of discriminative stimuli produced no spontaneous reversal in performance to a second, target, pair.
The pattern of results is best accounted for by an analysis of contextual conditional discrimination learning in terms of stimulus configurations and offers no support for the notion that rats may learn a general conditional rule or set. 相似文献
159.
160.
We examined the effects of acute psychological stress on lymphocyte proliferation and circulating levels of interleukin-1 and -2. Healthy men were exposed to two viewings of a gruesome surgery film and were asked to recall details of the film twice during a 30-min period. These subjects were compared to a nonstress control group. Lymphocyte proliferation to the mitogen concanavalin A (Con A; 5 micrograms/ml) was decreased during and after exposure to the stressor when compared to the control group. This decrease was more pronounced in subjects exhibiting greater blood pressure reactivity while viewing the film than in subjects showing smaller blood pressure responses. None of the other immunological measures was significantly affected by the stressor. Cortisol was not correlated with lymphocyte responsiveness. Possible explanations for these results and implications for further research are discussed. 相似文献