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Virtual communities like Second Life (SL) represent an economic factor with increasing potential, but may induce behavior that deviates from real-world experience. This article introduces a new experimental design that is based on the trust game (Berg, Dickhaut, & McCabe, 1995 Berg, J., Dickhaut, J. and McCabe, K. A. 1995. Trust, reciprocity, and social history. Games and Economic Behavior, 10: 290307.  [Google Scholar]), but eliminates the problem of multiple virtual identities. One treatment of the experiment in the virtual world SL was conducted and the results compared to the First Life (FL) control treatment, which was conducted on a university campus. In SL, significantly lower investment levels were found, but significantly higher average returns were found than in the FL treatment or in the literature. It is conjectured that the disparity between trusting and trustworthy behavior is a sign that the social structure in SL is still evolving. It seems plausible that the trustors in a young and developing society cautiously test the extent of trustworthiness, whereas the trustees strategically invest in levels of trustworthiness that are higher than in settled societies to build up a trustworthy environment.  相似文献   
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ABSTRACT

Prismatic refraction is a classic topic in science education. To investigate how undergraduate students think about prismatic dispersion, and to see how they change their thinking when observing dispersed images, five teaching experiments were done and analysed according to the Model of Educational Reconstruction. For projection through a prism, the students used a ‘split image projection’ conceptualisation. For the view through a prism, this conceptualisation was not fruitful. Based on the observed images, six of seven students changed to a ‘diverted image projection’ conceptualisation. From a comparison between students’ and scientists’ ideas, teaching implications are derived for an image-based approach.  相似文献   
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Many low‐skill readers have problems with visual word recognition. In particular, low‐skill readers show a substantial nonword reading deficit that is attributed to deficits in sub‐lexical processing. In this study, I examined whether the nonword deficits of German 14‐year‐old low‐skill readers were associated with inefficient use of multi‐letter information. In a lexical‐decision experiment, words and nonwords were presented in standard format and in MiXeD cAsE format which has been shown to be especially disrupting for sub‐lexical processing. When the stimuli were presented in standard format, low‐skill readers showed a substantial nonword reading deficit, that is they were generally slower than high‐skill readers, but had special problems with decoding nonwords. However, when stimuli were presented in MiXeD cAsE, low‐ and high‐skill readers showed equal impairments in nonword processing. This finding indicates that low‐skill readers do not use context‐sensitive multi‐letter rules during phonological assembly in normal reading.  相似文献   
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Increasingly, research has focused on the cognitive processes associated with various standard-setting activities. This qualitative study involved an examination of 16 third-grade reading teachers' experiences with the cognitive task of conceptualizing an entire classroom of hypothetical target students when the single-passage bookmark method or the yes/no method was used during a one-day mock panel meeting. Data were collected using in-depth focus group interviews with eight participants from each of the panel meetings, and a whole-text analysis revealed three categories. Most participants experienced difficulty in attempting to conceive of an entire classroom of target students. Most of them were ultimately unable to do so and made use of alternative cognitive strategies. More fundamental issues also contributed to the difficulties experienced in attempting to complete the required cognitive task. Implications of the findings for standard setting and for further research are also discussed.  相似文献   
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Using self‐report questionnaires, a survey among 606 Dutch primary school children aged 10 to 12 years examined relationships among social support, gender, victimization, and depressive feelings. Hierarchical regression analyses confirmed that victims and bully/victims would report more depressive feelings than uninvolved children. There was no evidence that social support moderated the relationship between victimization and depressive feelings. However, social support appeared to influence the depressive feelings of victimized children, that is, pupils who were victimized received very little support and hence suffered depression. This general mediation effect could be observed in boys. In girls, the mediating effects of social support were more diffuse. For girls, the risk factor for the development of depressive feelings did not so much pertain to the type of bullying as to the subsequent lack of social support they experienced. © 2011 Wiley Periodicals, Inc.  相似文献   
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