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Brian Lewthwaite Thomas Owen Ashley Doiron Barbara McMillan Robert Renaud 《Interchange》2013,44(1-2):105-128
In this study, First Nation community members in Canada’s Yukon Territory share their stories about teaching and learning, both in informal and formal settings, in an effort to identify practices that might serve teachers to be more responsive to their First Nation students. In all, 52 community members between the ages of 15 and 82 shared their stories and assisted in identifying eight categories of practice and thought associated with effective teaching practices for this First Nation. Based upon these categories of thought and practice, we present a pedagogical framework for teachers and, finally, illustrate how this profile and the stories about teaching and learning are being used for adjusting and improving teaching practice in this First Nation. 相似文献
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For the first time, we report on the preliminary evaluation of gold coated optical fibers (GCOFs) as three-dimensional (3D) electrodes for a membraneless glucose/O2 enzymatic biofuel cell. Two off-the-shelf 125 μm diameter GCOFs were integrated into a 3D microfluidic chip fabricated via rapid prototyping. Using soluble enzymes and a 10 mM glucose solution flowing at an average velocity of 16 mm s−1 along 3 mm long GCOFs, the maximum power density reached 30.0 ± 0.1 μW cm−2 at a current density of 160.6 ± 0.3 μA cm−2. Bundles composed of multiple GCOFs could further enhance these first results while serving as substrates for enzyme immobilization. 相似文献
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This paper studies the role of technology standards in firms’ product innovation in terms of both incremental innovation (within a technology life cycle) and radical innovation (beyond the present technology cycle). We first develop a theoretical model which predicts that technology standards can be used by firms as an “insurance” hedging against the risky process of developing new products. This insurance mechanism fosters incremental innovation and product growth especially for those further away from the technological frontier. Using data from a weighted panel of UK manufacturing firms over seven years, we find that the use of technology standards over past years significantly enables a firm’s incremental innovation while also reducing its incentive to deliver radical innovation. Additionally, we show that this relationship is contingent on a firm’s R&D intensity in line with predictions of our theoretical model. 相似文献
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Renaud MacGilchrist 《European Journal of Engineering Education》1981,6(3-4):263-265
The idea of writing a short essay, comparing the English and French schools of engineering, largely owes its genesis to a conversation with Professor Sir Alan J. Harris of Imperial College, London. It was during this discussion that it became evident that the benefits to be gained from a greater intercourse between schools engaged in international exchange programmes are not always apparent to the layman. One form of such an interchange was first carried out between the Ecole Nationale des Ponts et Chaussées and Imperial College of Science and Technology in the form of an exchange of their respective third year and graduate students. The author was one of the original participants in this scheme and believes he has greatly benefited from the experience. He is, however, occasionally confronted with the question (in France as well as in England): “Why did you come/go to France to learn engineering? What more does the experience have to offer?” This question, at first, almost invariably provoked a reaction of surprise and bafflement on the part of the author, who wishes in no way to be conceited in the matter. It is only recently that the author has come to accept the esoteric nature of the whole affair and furthermore to accept with hindsight that he is beginning to appreciate and exploit fully his one year at E.N.P.C., the major part of his original doubts having been dissipated. It is after having lived through and thoroughly digested the experience that these reflections are now possible. 相似文献
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Expenses in the performing arts have historically increased at a rate faster than earned revenues due to the labour reliance of the sector. Flanagan (The perilous life of symphony orchestras: artistic triumphs and economic challenges. Yale University Press, New York, 2012) found that US symphony orchestras were able to avoid the negative consequences of this earning gap by fostering strong private support. In the present study, we find that, in contexts where private funding is not as readily accessible, like in Canada, arts organizations have more incentive to keep expenses under control. This can be understood in terms of resource dependence where government funding bodies, due to a homogeneous set of demands, put pressure on organizations to control their expenses and reach greater audiences. Using panel data covering a period of 8 years and forty-eight orchestras, the results show that Canadian orchestras, when compared to US ones, achieve a lower rate of expense increases over time and are more reactive to economic downturns. 相似文献
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There is great interest in highly sensitive separation methods capable of quickly isolating a particular cell type within a single manipulation step prior to their analysis. We present a cell sorting device based on the opposition of dielectrophoretic forces that discriminates between cell types according to their dielectric properties, such as the membrane permittivity and the cytoplasm conductivity. The forces are generated by an array of electrodes located in both sidewalls of a main flow channel. Cells with different dielectric responses perceive different force magnitudes and are, therefore, continuously focused to different equilibrium positions in the flow channel, thus avoiding the need of a specific cell labeling as discriminating factor. We relate the cells’ dielectric response to their output position in the downstream channel. Using this microfluidic platform that integrates a method of continuous-flow cell separation based on multiple frequency dielectrophoresis, we succeeded in sorting viable from nonviable yeast with nearly 100% purity. The method also allowed to increase the infection rate of a cell culture up to 50% of parasitemia percentage, which facilitates the study of the parasite cycle. Finally, we prove the versatility of our device by synchronizing a yeast cell culture at a particular phase of the cell cycle avoiding the use of metabolic agents interfering with the cells’ physiology. 相似文献
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Aleksandra R. Budarick Jaymee R. Shell Shawn M. K. Robbins Tom Wu Philippe J. Renaud David J. Pearsall 《Sports biomechanics / International Society of Biomechanics in Sports》2020,19(5):601-617
ABSTRACT The skating acceleration to maximal speed transition (sprint) is an essential skill that involves substantial lower body strength and effective propulsion technique. Coaches and athletes strive to understand this optimal combination to improve performance and reduce injury risk. Hence, the purpose of this study was to compare body centre of mass and lower body kinematic profiles from static start to maximal speed of high calibre male and female ice hockey players on the ice surface. Overall, male and female skaters showed similar centre of mass trajectories, though magnitudes differed. The key performance difference was the male’s greater peak forward skating speed (8.96 ± 0.44 m/s vs the females’ 8.02 ± 0.36 m/s, p < 0.001), which was strongly correlated to peak leg strength (R 2 = 0.81). Males generated greater forward acceleration during the initial accelerative steps, but thereafter, both sexes had similar stride-by-stride accelerations up to maximal speed. In terms of technique, males demonstrated greater hip abduction (p = 0.006) and knee flexion (p = 0.026) from ice contact to push off throughout the trials. For coaches and athletes, these findings underscore the importance of leg strength and widely planted running steps during the initial skating technique to achieve maximal skating speed over a 30 m distance. 相似文献
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Previous research suggests that university teaching effectiveness varies with the age and personality traits of the instructor. The present study examined the extent to which personality traits associated with teaching effectiveness change concomitantly with age, and thus mediate the relationship between age and teaching. Using a cross-sectional design, peer ratings of 29 personality traits and archival student evaluations of teaching were obtained for 33 full-time psychology professors varying in age from 33 to 64. Teaching effectiveness was found to be inversely related to age and to correlate significantly with several personality traits. Consistent with the mediation hypothesis, personality traits were identified that correlated positively with teaching and declined significantly with age (e.g., approval-seeking); or correlated negatively with teaching and increased with age (e.g., independent).This paper is based on a senior honors thesis completed by the first author and supervised by the second author in the Department of Psychology, University of Western Ontario. 相似文献