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The authors assessed the influences of several risk factors—self‐esteem, history of unwanted sexual contact (USC), depression, and sorority membership—on eating‐related and weight‐related attitudes and behaviors. Findings provide support for the roles of self‐esteem, depression, and USC on restricting attitudes. According to the authors' model, these independent variables predicted restricting attitudes that then predicted restricting behaviors. Implications for preventive interventions and the study's limitations are discussed.  相似文献   
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This study chronicled the professional journeys of two beginning science teachers. The focus of the research effort documents what brought them to science teaching and investigated their resulting career paths. Data artifacts for this instrumental case study approach included: interviews, written survey responses, personal communications and member checks. All data was transcribed and coded into emergent categories using a constant comparative analysis approach. The findings indicated that their decisions to enter and leave teaching were a complex mélange of issues that included career disposition, notions of isolation, overarching culture of the school, and future possibilities. However, most striking was their re-entry into teaching on a temporary basis after considerable time away from the classroom, which suggests that teachers develop a sense of agency regarding their career decisions. This may require researchers to reconsider how we view teacher decision-making within the context of teacher attrition and mobility. Implications for science teacher education indicate that some teachers may enter the profession considering teaching to be a transition into a different career path. Secondary science teachers may perceive multiple career options (beyond the classroom) based on their preparation and teaching experience. Further implications and possibilities for science teacher education are discussed.  相似文献   
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We examine classroom situations which allow the learning of rules of mathematical reasoning. Drawing on an epistemological analysis and G. Brousseau's theory of situations, we define a priori theoretical characteristics which such situations must possess. We then use this analysis, and hypotheses about the cognitive functioning of pupils of this age, to establish learning situations for the rule of the excluded middle, and for the use of the figure in geometry. We report the results of experimentation with two of thses situations and show that, through the study of a mathematical problem, debate about these rules can be generated amongst students aged twelve to thirteen. We explain why, in our opinion, for epistemological reasons linked to the two particular rules concerned, it is necessary for the teacher to conclude the debate, and we examine our cognitive hypotheses against the actual results of experimentation.  相似文献   
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A semi-structured interview was used to enquire into the knowledge of models and modelling held by a total sample of 39 Brazilian science teachers working in 'fundamental' (ages 6-14 years) and 'medium' (ages 15-17 years) schools, student teachers, and university teachers. This paper focuses on their perceptions of the role of models in science teaching. The teachers' ideas are organized in three groups: the status and value of models; the influences that inform the translation of these general ideas into classroom practice; and how they respond to the outcomes of students' modelling activities. The teachers interviewed generally showed an awareness of the value of models in the learning of science but not of their value in learning about science. They were also uncertain of the relationship that could exist in the classroom between various types of models. Modelling, as an activity by students, whilst praised in theory, would not seem to be widely practised. Where practised, the outcomes are by no means always treated with that integrity that learning about science would call for.  相似文献   
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