全文获取类型
收费全文 | 46090篇 |
免费 | 1869篇 |
国内免费 | 15篇 |
专业分类
47974篇 |
出版年
2020年 | 450篇 |
2019年 | 541篇 |
2018年 | 709篇 |
2017年 | 754篇 |
2016年 | 832篇 |
2015年 | 625篇 |
2014年 | 734篇 |
2013年 | 3395篇 |
2012年 | 1368篇 |
2011年 | 1337篇 |
2010年 | 870篇 |
2009年 | 823篇 |
2008年 | 1215篇 |
2007年 | 1198篇 |
2006年 | 1055篇 |
2005年 | 1004篇 |
2004年 | 961篇 |
2003年 | 871篇 |
2002年 | 948篇 |
2001年 | 1353篇 |
2000年 | 1308篇 |
1999年 | 997篇 |
1998年 | 518篇 |
1997年 | 449篇 |
1992年 | 954篇 |
1991年 | 893篇 |
1990年 | 898篇 |
1989年 | 785篇 |
1988年 | 769篇 |
1987年 | 741篇 |
1986年 | 779篇 |
1985年 | 864篇 |
1984年 | 684篇 |
1983年 | 627篇 |
1982年 | 470篇 |
1981年 | 484篇 |
1979年 | 793篇 |
1978年 | 535篇 |
1977年 | 508篇 |
1976年 | 501篇 |
1975年 | 677篇 |
1974年 | 766篇 |
1973年 | 772篇 |
1972年 | 673篇 |
1971年 | 619篇 |
1970年 | 608篇 |
1969年 | 609篇 |
1968年 | 789篇 |
1967年 | 697篇 |
1966年 | 628篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
211.
Z Solomon M Waysman G Levy B Fried M Mikulincer R Benbenishty V Florian A Bleich 《Family process》1992,31(3):289-302
While the long-term effects of combat trauma on veterans have been studied extensively, its impact on veterans' wives has yet to be investigated. This study examined the implications of combat-induced psychopathology--wartime combat stress reaction (CSR) and current posttraumatic stress disorder (PTSD)--in a sample of 205 wives of Israeli combat veterans of the 1982 Lebanon war. Results show that both CSR and PTSD were associated with increased psychiatric symptoms in the wives. In addition, current PTSD was particularly found to contribute to impaired social relations among veterans' wives in a broad range of contexts, from inner feelings of loneliness, through impaired marital and family relations, and extending to the wider social network. Implications of these findings for treatment and further research are discussed. 相似文献
212.
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
213.
214.
215.
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
216.
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
217.
Three mirror tracing experiments were conducted to investigate the connection between perception and motor behavior. In the first experiment, some subjects traced a hex-maze, other subjects traced a hex-maze after observing a model trace, others traced a hex-maze after reading instructions on mirror images, and others traced a hex-maze after having observed a model and heard the instructions. There were no significant differences between the groups' error scores, but their time scores differed significantly, although not always in the predicted direction. In Experiment 2, the subjects were to trace selected letters of the alphabet. Error scores for the second experiment did not differ much from those for the first experiment. In Experiment 3, the experimenter gave each subject commands for the correct directions of movement, using the subject's body as a frame-of-reference. There was little improvement in motor performance. These results suggest that the visual information presented in the mirror captured the subjects' attention and blocked their motor tracing program. 相似文献
218.
Exposed eye area (EEA) was measured in photographs of Indian adults who modeled six emotions--happiness, sadness, fear, anger, surprise, and disgust--as well as a neutral expression. The data were analyzed with a 2 x 6 (Eyes x Emotions) factorial analysis of covariance (ANCOVA). EEA for neutral expression was used as the covariate measure. The EEAs of the two eyes did not differ significantly during the expression of emotion. The EEAs for fear and surprise were significantly larger, and the EEA for disgust was significantly smaller than those for either other emotions or neutral expression. 相似文献
219.
A recent paper by Kail (1988) in this journal appears to contain a significant error in the data analysis. The "goodness-of-fit" coefficients reported which suggest that overall about 94% of the variance can be accounted for by the model seem to be a substantial overestimation as a result of inappropriate procedures for statistical modeling. Using the data made available to us by Kail, we have reanalyzed these results. The corrected values range from 0.9 to 92.1% for the individual tasks with an overall average between 40 and 60%. We suggest that the support for the original conclusions is considerably weaker than reported. 相似文献
220.
Three experiments were conducted to examine the operation of the representativeness and anchoring and adjustment heuristics in lottery play. Subjects in Experiments 1 and 2 indicated their chances of winning a lottery with an objective probability of 1 in 10. Consistent with the anchoring and adjustment heuristic, subjects (in both experiments) perceived their chances of winning to be greater when the lottery was based on a single event than when it was based on a disjunctive event. Subjects in these two experiments also selected numbers to play in a pick-3 (Experiment 1) or pick-4 (Experiment 2) lottery. Consistent with the representativeness heuristic, subjects in Experiment 2 demonstrated a preference for numbers without repeating digits. This also occurred in Experiment 3 wherein the numbers actually played in the Indiana daily Pick-3 lottery were examined. 相似文献