全文获取类型
收费全文 | 188642篇 |
免费 | 8195篇 |
国内免费 | 156篇 |
专业分类
196993篇 |
出版年
2020年 | 2805篇 |
2019年 | 3450篇 |
2018年 | 3606篇 |
2017年 | 4062篇 |
2016年 | 4681篇 |
2015年 | 3925篇 |
2014年 | 4806篇 |
2013年 | 23480篇 |
2012年 | 4946篇 |
2011年 | 4095篇 |
2010年 | 4018篇 |
2009年 | 4821篇 |
2008年 | 4235篇 |
2007年 | 3805篇 |
2006年 | 4308篇 |
2005年 | 4303篇 |
2004年 | 3753篇 |
2003年 | 3360篇 |
2002年 | 3212篇 |
2001年 | 3977篇 |
2000年 | 3828篇 |
1999年 | 3564篇 |
1998年 | 2892篇 |
1997年 | 2707篇 |
1996年 | 2620篇 |
1995年 | 2452篇 |
1994年 | 2436篇 |
1993年 | 2375篇 |
1992年 | 3045篇 |
1991年 | 2846篇 |
1990年 | 2761篇 |
1989年 | 2604篇 |
1988年 | 2551篇 |
1987年 | 2589篇 |
1986年 | 2579篇 |
1985年 | 2806篇 |
1984年 | 2768篇 |
1983年 | 2530篇 |
1982年 | 2461篇 |
1981年 | 2429篇 |
1980年 | 2235篇 |
1979年 | 2542篇 |
1978年 | 2333篇 |
1977年 | 2275篇 |
1976年 | 2088篇 |
1975年 | 2321篇 |
1974年 | 2449篇 |
1973年 | 2341篇 |
1972年 | 1918篇 |
1968年 | 1836篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
801.
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
802.
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
803.
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
804.
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
805.
In this study 21 displaced workers were interviewed regarding factors affecting their participation in training programs funded by the Job Training Partnership Act. Differences between program participants and nonparticipants, differences among program participants, and differences among nonparticipants were identified. 相似文献
806.
JOHN J. LIPTAK 《Journal of Employment Counseling》1992,29(2):60-68
The Career Exploration Inventory, an innovative interest inventory that measures work and leisure interests throughout the life span, can be used by employment counselors to assist their clients in the exploration of the interaction of work and leisure interests. 相似文献
807.
Associations of two different response sets on the Infrequent Response Index of the Strong Interest Inventory (SII) were examined. In one, participants responded to each item randomly; in the other, participants deliberately misrepresented their responses. The finding of scores higher than those proposed in the SII manual for the Infrequent Response Index suggests an alternative interpretation of this critical index. 相似文献
808.
This study examined the career aspirations of pregnant teens enrolled in a program designed to minimize their chances of dropping out of high school. The teens completed a demographic data form that included questions on their career aspirations. The data were coded by Holland type using the Dictionary of Holland Occupational Codes. Trends were discussed in light of the future labor market and critical need for career counseling for this at-risk population. 相似文献
809.
Employers of human resource professionals described their hiring practices. This information is especially useful for counselors and for developing curricula for nonbusiness majors interested in human resource careers. 相似文献
810.
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