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41.
Adolescents' peer structures and the quality of their friendships were explored as antecedents of romantic relationships. Longitudinal data were gathered in a sample of 180 high school students over a 3-year period from grade 9 to grade 11. Consistent with Dunphy (1963), small groups of close friends were predictive of other-sex peer networks which were, in turn predictive of the emergence of future romantic relationships. Indirect effects were found for same-sex groups of close friends and same-sex networks. Consistent with Furman and Wehner (1994), the qualitative features of relationships with both friends and romantic partners were predictive of the qualitative features of subsequent romantic experiences. These linkages suggest ways in which peer relationships may support romantic development at this stage of the life cycle. 相似文献
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M.D. Roblyer John Freeman Martha B. Donaldson Melina Maddox 《The Internet and Higher Education》2007,10(4):261-268
As part of the formative evaluation of Alabama's pilot of its virtual schooling system (the Alabama ACCESS Distance Learning Program), the Alabama State Department of Education examined outcome data from courses offered in the two distance delivery systems: web-based course management and interactive videoconferencing (IVC). In light of Bernard et al's. [Bernard, R., Abrami, P., Lou, Y., Borokhovski, E., Wade, A., Wozney, L., et al. (2004). How does distance learning compare with classroom instruction? A meta-analysis of the empirical literature. Review of Educational Research, 74(3), 379–434] recent meta-analysis finding that asynchronous distance environments generally had more positive outcomes than synchronous ones, a comparison of online (asynchronous) and IVC (synchronous) platforms provided an opportunity to explore and shed more light on outcome comparisons between synchronous and asynchronous platforms. Though there were some outcome differences, the dominant finding was of no differences between platforms. 相似文献
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Although the validity of knowledge is critical to scientific progress, substantial concerns exist regarding the governance of knowledge production. While research errors are as relevant to the knowledge economy as defects are to the manufacturing economy, mechanisms to identify and signal “defective” or false knowledge are poorly understood. In this paper, we investigate one such institution - the system of scientific retractions. We analyze the universe of peer-reviewed scientific articles retracted from the biomedical literature between 1972-2006 and comparing with a matched control sample in order to identify the correlates, timing, and causal impact of scientific retractions. This effort provides insight into the workings of a distributed, peer-based system for the governance of validity in scientific knowledge. Our findings suggest that attention is a key predictor of retraction - retracted articles arise most frequently among highly-cited articles. The retraction system is expeditious in uncovering knowledge that is ever determined to be false (the mean time to retraction is less than two years) and democratic (retraction is not systematically affected by author prominence). Lastly, retraction causes an immediate, severe, and long-lived decline in future citations. Conditional on the obvious limitation that we cannot measure the absolute amount of false science in circulation, these results support the view that distributed governance systems can be designed to uncover false knowledge relatively swiftly and to mitigate the costs that false knowledge for future generations of producers. 相似文献
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Lou Furman 《Early Childhood Education Journal》2000,27(3):173-178
Early childhood practitioners appear to be in an unending battle to legitimize the use of the dramatic arts in the classroom.
Even early childhood educators who accept the value of dramatic play seldom utilize the potential of drama fully. The purpose
of this article is to reinforce the value of drama and theater for young children. Dramatic play, creative drama, theater,
and television—a form of drama — all have their place in the development of young children. 相似文献
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Over the final two decades of the 20th century, a number of formerly industrializing economies and historical imitator countries achieved levels of innovative capacity commensurate with or greater than those of some economies that were historically more innovative. We investigate the factors that enabled such emerging innovator economies to achieve successful catch-up while some historically more innovative countries experienced relative declines in innovative productivity. We focus our analysis on the estimation of a production function for innovations at the world's technical frontier. Based on the results of this analysis, we classify countries into categories reflecting their historical levels of innovative capacities and develop counterfactual indices that identify the factors that correspond to long-run improvements in innovative roductivity. These exercises suggest that the development of innovation-enhancing policies and infrastructures are necessary for achieving innovative leadership, but that these are insufficient unless coupled with ever-increasing financial and human capital investments in innovation. 相似文献
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