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This study evaluated the aspects of complex decisions influenced by peers, and components of peer involvement influential to adolescents’ risky decisions. Participants (N = 140) aged 13–25 completed the Columbia Card Task (CCT), a risky choice task, isolating deliberation-reliant and affect-reliant decisions while alone, while a friend monitors choices, and while a friend is merely present. There is no condition in which a nonfriend peer is present. Results demonstrated the risk-increasing peer effect occurred in the youngest participants in the cold CCT and middle-late adolescents in the hot CCT, whereas other ages and contexts showed a risk-decreasing peer effect. Mere presence was not sufficient to influence risky behavior. These boundaries in age, decision, and peer involvement constrain prevailing models of adolescent peer influence.  相似文献   
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Educators throughout the ages have offered metaphors and analogies for teaching and teachers. Prominent among them are: gardener, midwife, facilitator, guide, sacrament. Each of these metaphors shed light, from a different angle, on the act of teaching. This article proposes the metaphor of tragedy as a way of shedding new light, from a totally different perspective, on what it means to engage in academic teaching of religion. It explores three areas in particular in light of the metaphor: the quest for certainty, the confessional classroom, and learning without teaching. Tragedy holds the possibility of opening up awareness of the uniqueness of teaching the conversation when placed in critical dialogue with these three areas.  相似文献   
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This paper focuses on the factors that influence collaborative learning in distance education. Distance education has been around for many years and the use of collaborative learning techniques in distance education is becoming increasingly popular. Several studies have demonstrated the superiority of collaborative learning over traditional modes of learning and it has been identified as a potential solution to some of the weaknesses of traditional distance education courses. There are a rapidly growing number of technologies in use today and educators and practitioners face an increasingly difficult challenge to successfully implement collaborative learning in distance education; precipitated not only from technical advances but also from wider social and organisational concerns. To the best of our knowledge, this study is the first to investigate the factors that influence collaborative learning in distance education, by eliciting the opinions of an expert panel using a Delphi survey. The aim was to produce an integrated list of the most important implementation factors and to investigate the role that technology is perceived to contribute. The findings identified 17 of the most important factors; these factors cover a range of themes including course rationale and design, instructor characteristics, training, group dynamics, the development of a learning community and technology. The potential of technology, however, does not seem to be fully realised and newer technologies such as multi‐user environments would seem to be of limited use in practice according to the expert panel.  相似文献   
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The identification of nonlinear models sometimes encounters problems because of the limited amount of available measurements in combination with a large number of uncertain model parameters to be identified. E.g., the determination of the chemical composition of a lettuce crop is a rather expensive procedure; thus the number of experimental measurements is limited. As a result, the number of parameters of the dynamic model that can be successively identified is also limited, and the subset of the parameters to be identified must be chosen in a reasonable way.Parameter estimation for an extended nonlinear three-state model for lettuce growth in greenhouses is presented in this paper. The varying structural nitrogen concentration and water contents are the new elements included in the model. The dominant parameter selection (DPS) method was used to select a suitable set of identifiable parameters. The resulting calibrated model predicts quite well the experimental data which also include observations with severe nitrogen stress.  相似文献   
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Abstract

Sport science is a relatively recent domain of research born from the interactions of different disciplines related to sport. According to the European College of sport science (http://sport-science.org): “scientific excellence in sport science is based on disciplinary competence embedded in the understanding that its essence lies in its multi- and interdisciplinary character”. In this respect, the scientific domain of neuroscience has been developed within such a framework. Influenced by the apparent homogeneity of this scientific domain, the present paper reviews three important research topics in sport from a neuroscientific perspective. These topics concern the relationship between mind and motor action, the effects of cognition on motor performance, and the study of certain mental states (such as the “flow” effect, see below) and motor control issues to understand, for example, the neural substrates of the vertical squat jump. Based on the few extensive examples shown in this review, we argue that by adopting an interdisciplinary paradigm, sport science can emulate neuroscience in becoming a mono-discipline.  相似文献   
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