全文获取类型
收费全文 | 29879篇 |
免费 | 1008篇 |
国内免费 | 15篇 |
出版年
2019年 | 302篇 |
2018年 | 462篇 |
2017年 | 497篇 |
2016年 | 526篇 |
2015年 | 348篇 |
2014年 | 432篇 |
2013年 | 2385篇 |
2012年 | 849篇 |
2011年 | 924篇 |
2010年 | 583篇 |
2009年 | 582篇 |
2008年 | 829篇 |
2007年 | 844篇 |
2006年 | 774篇 |
2005年 | 700篇 |
2004年 | 685篇 |
2003年 | 686篇 |
2002年 | 715篇 |
2001年 | 832篇 |
2000年 | 853篇 |
1999年 | 681篇 |
1998年 | 351篇 |
1997年 | 327篇 |
1996年 | 312篇 |
1993年 | 310篇 |
1992年 | 549篇 |
1991年 | 497篇 |
1990年 | 521篇 |
1989年 | 492篇 |
1988年 | 482篇 |
1987年 | 498篇 |
1986年 | 485篇 |
1985年 | 513篇 |
1984年 | 445篇 |
1983年 | 416篇 |
1982年 | 343篇 |
1981年 | 308篇 |
1979年 | 493篇 |
1978年 | 393篇 |
1977年 | 357篇 |
1976年 | 340篇 |
1975年 | 428篇 |
1974年 | 461篇 |
1973年 | 439篇 |
1972年 | 384篇 |
1971年 | 327篇 |
1969年 | 350篇 |
1968年 | 402篇 |
1967年 | 358篇 |
1966年 | 346篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
61.
62.
Previous research has revealed that individuals have expectations for the development of romance based on personal experience and cultural images. A series of research questions and hypotheses was generated and a sequence of hierarchical log-linear analysis models axis developed to test (a) the effect of gender and knowledge of relational stage and relationship type on prediction of next-occurring actions in the development of a romance, (b) the use of compliance-gaining strategies intended to advance a relationship to the next stage, and (c) justification of secondary goals in which participants reported why they chose the strategies they did as opposed to other alternatives. The data revealed effects for relational stage progression on prediction of ensuing actions. Ingratiation, explanation, and direct requests were popular strategies for developing intimacy. Gender differences in terms of secondary goals were reported. Results are discussed in terms of relational memory structures for the development of intimacy. 相似文献
63.
This research examines how maximizers make decisions when they must trade-off between desirability and feasibility attributes. Across four studies, we demonstrate that maximizers tend to prefer choices offering more desirability to those offering more feasibility and respond more favorably to a product's advertising when it highlights desirability more than feasibility attributes. Furthermore, we show that maximizers' focus on outcomes rather than processes drives their preference for desirability, such that changing from an outcome to a process focus can redirect their interest from desirability to feasibility. By contrast, satisficers do not prefer products higher in desirability to those higher in feasibility and are not more receptive to ads highlighting desirability attributes. Furthermore, because satisficers may focus on both the outcome and the process, priming either one is redundant and does not alter their preference for desirability or feasibility. 相似文献
64.
65.
66.
67.
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
68.
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
69.
70.