全文获取类型
收费全文 | 181411篇 |
免费 | 8044篇 |
国内免费 | 162篇 |
出版年
2020年 | 2765篇 |
2019年 | 3431篇 |
2018年 | 3666篇 |
2017年 | 4090篇 |
2016年 | 4702篇 |
2015年 | 3906篇 |
2014年 | 4774篇 |
2013年 | 23363篇 |
2012年 | 4966篇 |
2011年 | 4190篇 |
2010年 | 4020篇 |
2009年 | 4847篇 |
2008年 | 4355篇 |
2007年 | 3956篇 |
2006年 | 4368篇 |
2005年 | 4310篇 |
2004年 | 3818篇 |
2003年 | 3415篇 |
2002年 | 3242篇 |
2001年 | 3794篇 |
2000年 | 3585篇 |
1999年 | 3442篇 |
1998年 | 2871篇 |
1997年 | 2689篇 |
1996年 | 2592篇 |
1995年 | 2438篇 |
1994年 | 2407篇 |
1993年 | 2352篇 |
1992年 | 2806篇 |
1991年 | 2660篇 |
1990年 | 2515篇 |
1989年 | 2401篇 |
1988年 | 2365篇 |
1987年 | 2359篇 |
1986年 | 2354篇 |
1985年 | 2581篇 |
1984年 | 2592篇 |
1983年 | 2368篇 |
1982年 | 2412篇 |
1981年 | 2353篇 |
1980年 | 2211篇 |
1979年 | 2303篇 |
1978年 | 2218篇 |
1977年 | 2171篇 |
1976年 | 1984篇 |
1975年 | 2097篇 |
1974年 | 2143篇 |
1973年 | 2001篇 |
1972年 | 1617篇 |
1971年 | 1542篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
901.
This study examined Protestant Work Ethic (PWE) and Just World Beliefs (JWB) in Great Britain and India. Secondary school children, university students and adults completed seven PWE questionnaires and the JWB questionnaire. A three-way (sex × occupational status × nationality) ANOVA showed highly significant main effects, particularly for nationality, but few significant interactions. Generally females more than males, Indians more than Britons, and schoolchildren more than adults endorse the PWE and JWB. Possible experimental artifacts and moderator variables are considered along with the possibility that genuine cultural differences were found. These results are discussed in terms of the relevant literature on cross-cultural studies of the PWE and BJW. 相似文献
902.
903.
Twenty treated and 18 untreated spider phobics were exposed to a series of 72 slides. Three different categories of slides were used: phobia-relevant slides (spiders), alternative fear-relevant slides (weapons), and neutral slides (flowers). Slides were randomly paired with either a shock, a tone, or nothing at all. Despite the absence of a systematic correlation between slides and outcomes, untreated phobics strongly overestimated the covariation between spider slides and shock. Treated phobics did not show a covariation bias, suggesting that such bias can be modulated by behavioral treatment. In addition, untreated subjects were more confident about their contingency estimates than were treated subjects. The present results fit with earlier studies. 相似文献
904.
When thinking under uncertainty, people often do not consider appropriately each of the relevant branches of a decision tree, as required by consequentialism. As a result they sometimes violate Savage's sure-thing principle. In the Prisoner's Dilemma game, for example, many subjects compete when they know that the opponent has competed and when they know that the opponent has cooperated, but cooperate when they do not know the opponent's response. Newcomb's Problem and Wason's selection task are also interpreted as manifestations of nonconsequential decision making and reasoning. The causes and implications of such behavior, and the notion of quasi-magical thinking, are discussed. 相似文献
905.
906.
907.
908.
909.
Event-related potentials (ERPs), accuracy scores, and reaction times were used to examine the recognition of emotional expressions. Adults and 7-year-old children saw upright and inverted chromatic slides of the facial expressions of happiness, fear, surprise, and anger, and were asked to press a button for either "happy" or "angry" faces. A positive-going waveform (P300) was apparent at parietal scalp (Pz) and at left and right temporal scalp. Although the behavioral data were similar for both children and adults (e.g., both had more difficulty recognizing angry expressions than happy ones, and angry expressions were more difficult to recognize upside-down than were happy faces), the ERPs indicated that children responded differently than adults did to happy and angry expressions. Adults showed greater P300 amplitude to happy faces, while children showed greater P300 amplitude to angry faces. In addition, for adults, but not children, there were greater P300 amplitude responses at right vs. left temporal scalp. 相似文献
910.
Light and Humphreys (1981, Journal of Experimental Child Psychology, 31, 521-530) provided evidence that young children's drawings, despite infrequently showing view-specific occlusion, do systematically reflect spatial relations within an array. The present research tested the hypothesis that young children's preferences for canonical "best views" interact with array-faithful tendencies to increase early uses of occlusion. Forty-three children between 4 and 7 years of age drew arrays like Light and Humphreys' end-to-end alignments, with end-on views of objects in depth, and arrays aligned side-to-side, with canonical side-views of objects in depth. Significantly fewer single-object, view-specific occlusions were produced for end-to-end than for side-to-side alignments. Nevertheless, the former reveal that more children are able to use the vertical dimension to depict multiple objects in depth. Other comparisons suggest an interaction in multiple-object depictions of canonicality with spatial dimension and graphic complexity. 相似文献