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991.
992.
George Wetmore Colles 《Journal of The Franklin Institute》1905,160(4):275-295
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Jobson SA Nevill AM George SR Jeukendrup AE Passfield L 《Journal of sports sciences》2008,26(12):1269-1278
The aims of this study were to compare the physiological demands of laboratory- and road-based time-trial cycling and to examine the importance of body position during laboratory cycling. Nine male competitive but non-elite cyclists completed two 40.23-km time-trials on an air-braked ergometer (Kingcycle) in the laboratory and one 40.23-km time-trial (RD) on a local road course. One laboratory time-trial was conducted in an aerodynamic position (AP), while the second was conducted in an upright position (UP). Mean performance speed was significantly higher during laboratory trials (UP and AP) compared with the RD trial (P < 0.001). Although there was no difference in power output between the RD and UP trials (P > 0.05), power output was significantly lower during the AP trial than during both the RD (P = 0.013) and UP trials (P = 0.003). Similar correlations were found between AP power output and RD power output (r = 0.85, P = 0.003) and between UP power output and RD power output (r = 0.87, P = 0.003). Despite a significantly lower power output in the laboratory AP condition, these results suggest that body position does not affect the ecological validity of laboratory-based time-trial cycling. 相似文献
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George L. Boggs 《Cultural Studies of Science Education》2011,6(2):337-346
This forum response adds a conceptualization of harmony to Dopico and Vázquez’ investigation of pedagogy that combines citizen
science, environmental and cross-cultural research, and service-learning. Placing many appropriate and significant aspects
of culturally situated science education in an authentically relational context beyond the classroom, this paper calls attention
to insightful contributions and new directions for research, such as the process of inducing or eluding nihilism regarding
ecological issues. How can such a question be researched effectively in order to learn about the family of pedagogies emerging
in response to the need for more ecologically conscious and relationally authentic teaching across many disciplines? In this
paper, I use a Vygotskian framework and an abbreviated case study of agricultural service-learning from my research, drawing
attention to the importance of students’ culturally-mediated construction of setting as they interact in older and newer ways. 相似文献
998.
Darlene C. Chisholm Margaret S. McMillan George Norman 《Journal of Cultural Economics》2010,34(2):131-145
We present an empirical analysis of product differentiation using a new panel data set on film-programming choice in a major
U.S. metropolitan motion-pictures exhibition market. Using these data, we compute two measures of product similarity, which
allow us to investigate the determinants of strategic product differentiation in a multi-characteristics space. Our evidence
is consistent with the idea that the degree of product differentiation between theatre pairs reflects a balance between strategic
concerns and contractual constraints. Similarity in one dimension is offset by differentiation in others. Our results further
suggest that the degree of product differentiation is negatively related to market size. Finally, we find that ownership matters:
theatres under common ownership make more similar programming choices than theatres with different owners. 相似文献
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