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Using structural equation models, with gender, parent education, and prior grade point average (GPA) as control variables, we examined the relationships among intrinsic motivation to learn, learning goals, behavioral engagement at school, and academic performance (measured by GPA) in 1,575 students in an ethnically and racially diverse high school. Intrinsic motivation to learn was indirectly and positively related to academic performance via classroom engagement. Seventy‐five percent of the variance in engagement and 33% of the variance in GPA were explained by variables in the study. Results were generally replicated when the model was tested separately with the 336 African American students and the 311 Latin@ students. The significant indirect effect of intrinsic motivation to learn on GPA via engagement, as well as the positive direct association between learning goals and academic performance, suggest that students will benefit from schools fostering intrinsic motivation to learn and learning goals. 相似文献
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采用议程设置理论对2008年北京奥运前后国际电视传媒有关中国的报道进行内容分析,旨在探索大型事件如何影响东道国国家形象。以国家形象可见性、效价、主题结构、归因四个要素为框架,对美国、英国、德国、法国等九个国家的电视媒体报道中有关中国的新闻进行定量内容分析。结论如下:1)大型事件之前,东道主国家形象的可见性将升高,然而,在大型事件之后,东道国在国际媒体中的可见性甚至低于往常;2)奥运会后一年有关中国的新闻与会前一年相比,不明确的效价显著减少,正面和负面的效价比例均显著增加,2008北京奥运对中国的贡献在于增进了世界媒体和公众对中国的理解,但奥运会后中国的国际形象并没有显著改善;3)中国形象的主题结构和归因两个属性保持相对稳定,大型事件仅仅能够激发国际媒体对东道国的兴趣,并使东道国国家形象清晰化。 相似文献
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Previous studies of system innovations mainly focused on historical cases that were driven by commercial motivations of pioneers and entrepreneurs. This article investigates a system innovation in the making that is driven by normative concerns, such as sustainability or animal welfare, initially formulated by outsiders like special-interest groups. Our central research question is: How, when and why is normative contestation of existing regimes effective in influencing the orientation of transitions in the making?The conceptual framework enriches innovation studies and the multi-level perspective with insights from social movement theory (SMT) and political science. SMT is used to analyze the build up of normative pressure (through framing, resource mobilization, and political opportunity structures). From political science we use the notion of multiple streams, in our analysis a problem, regulatory, market and technology stream.The research design consists of a comparative case study of pig husbandry systems. One case analyses the sub-sector of pregnant sows where normative pressures, after several decades, led to the changes advocated by the contestants. The second case concerns the sub-sector of pig fattening where normative pressure was less successful.The difference is partly explained by the normative pressure for pregnant sows being larger than for fattening pigs. The other part of the explanation is that in the first case normative pressure aligned better with the three other streams (regulatory, market and technology) to lead to the changes desired by the contestants. 相似文献
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There is a lack of understanding regarding the optimal conditions for interdisciplinary research. This study investigates what characteristics of researchers are associated with disciplinary and interdisciplinary research collaborations and what collaborations are most rewarding in different scientific disciplines. Our results confirm that female scientists are more engaged in interdisciplinary research collaborations. Further, a scientist's years of research experience are positively related with both types of collaboration. Work experience in firms or governmental organizations increases the propensity of interdisciplinary collaborations, but decreases that of disciplinary collaborations. Disciplinary collaborations occur more frequent in basic disciplines; interdisciplinary collaborations more in strategic disciplines. We also found that in both types of disciplines, disciplinary collaborations contribute more to career development than interdisciplinary collaborations. We conclude with three recommendations for science and innovation policy, while emphasising the need to distinguish between different scientific disciplines. 相似文献