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11.
Noreen D. Willows Cynthia Strawson-Fawcett Shauna M. Downs 《Journal of Food Science Education》2008,7(2):30-34
ABSTRACT: Problem-based learning (PBL) can provide an enhanced appreciation of the relationship between culture and food for students who aspire to become dietitians or nutrition educators; however, large university classes often inhibit the use of PBL. A professor who specializes in research documenting the relationships among food and culture took 17 Canadian university students, many of whom were studying nutrition and food science, to southern Italy where they learned about Mediterranean diets and Italian food culture. PBL was implemented by encouraging students to work together to solve problems, and by the completion of assignments that promoted observation of and interaction with the local culture. Students evaluated the experience positively with majority agreement that the quality of course content was excellent, that knowledge of the subject areas increased, and that the courses challenged students to critically think about issues. Despite a focused effort on PBL in the courses, not all students agreed that the courses helped them to develop the ability to solve real problems in this field. This may have been due to unawareness of dietetic competencies by some students. Many of the assignments used in Italy could be adopted for use in food culture classes in North America, or by postsecondary instructors planning travel study programs in Italy. 相似文献
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Dawn H. Currie Deirdre M. Kelly Shauna Pomerantz 《British Journal of Sociology of Education》2007,28(1):23-37
While researchers and concerned adults alike draw attention to relational aggression among girls, how this aggression is associated with girls’ agency remains a matter of debate. In this paper we explore relational aggression among girls designated by their peers as ‘popular’ in order to understand how social power constructs girls’ agency as aggression. We locate this power, hence girls’ agency, in contradictory messages about girlhood that, although ever‐present ‘in girls heads,’ are typically absent in adult panic about girls’ aggression. Within peer culture, power comes from the ability to invoke the unspoken ‘rules’ that police the boundaries of acceptable femininity. We thus challenge the notion advanced by Pipher and others that girls’ empowerment entails (re)gaining an ‘authentic voice.’ In contrast, we suggest that such projects must be informed by an interrogation of how girls are positioned as speaking subjects. 相似文献
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Martin A. Pomerantz 《Journal of The Franklin Institute》1946,241(6):415-433
The secondary electron emission from alkaline-earth oxide-coated cathodes has been investigated under both continuous and pulsed bombardment. Various factors affecting the yield, such as dependence upon primary voltage, collecting voltage, temperature, time, and angle of incidence, are noted, and the present state of the theory is discussed.Experiments have been performed with three types of apparatus. Yield vs. Energy data reveal values of δ of 4–7 at room temperature, with a more or less flat maximum at approximately 1,000 volts primary energy.The yield increases with temperature in an exponential manner, and plots of log Δδ (i.e. δK° ? δ300°K) vs. 1/T give straight lines. Values of Q1 between 0.9 – 1.5 eV. are generally indicated, and from extrapolation of these curves, yields exceeding 100 at 850° C. are deduced. The secondary emission depends upon the degree of activation, and increases with enhancement of the thermionic emission characteristics. Short-time effects such as growth or decay of secondary current after the onset of primary bombardment or persistence after the cessation of bombardment have not been observed, and values of yield obtained by pulsed methods are in accord with those obtained under D.C. conditions. Tail phenomena reported by J. B. Johnson and interpreted as “enhanced thermionic emission” from oxidecoated cathodes become manifest only under experimental conditions characterized by certain space-charge effects, and have been effectively simulated by bombarding a tantalum target adjacent to an electron-emitting tungsten filament. Various measurements of the energy distribution of secondary electrons as a function of primary voltage and temperature have been obtained. It was observed that the average energy of the secondary electrons decreases with temperature at a rate which more than compensates for the increase in the number of secondaries emitted per incident primary. The mechanism of the observed dependence of yield upon temperature is not well understood. Various alternative explanations are discussed and, in the light of the present state of our knowledge, regarded as untenable. 相似文献
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