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81.
Abstract Swain (1997) employed the mathematical model of Di Prampero et al. (1979) to predict that, for cycling time-trials, the optimal pacing strategy is to vary power in parallel with the changes experienced in gradient and wind speed. We used a more up-to-date mathematical model with validated coefficients (Martin et al., 1998) to quantify the time savings that would result from such optimization of pacing strategy. A hypothetical cyclist (mass = 70 kg) and bicycle (mass = 10 kg) were studied under varying hypothetical wind velocities (?10 to 10 m · s?1), gradients (?10 to 10%), and pacing strategies. Mean rider power outputs of 164, 289, and 394 W were chosen to mirror baseline performances studied previously. The three race scenarios were: (i) a 10-km time-trial with alternating 1-km sections of 10% and ?10% gradient; (ii) a 40-km time-trial with alternating 5-km sections of 4.4 and ?4.4 m · s?1 wind (Swain, 1997); and (iii) the 40-km time-trial delimited by Jeukendrup and Martin (2001). Varying a mean power of 289 W by ± 10% during Swain's (1997) hilly and windy courses resulted in time savings of 126 and 51 s, respectively. Time savings for most race scenarios were greater than those suggested by Swain (1997). For a mean power of 289 W over the “standard” 40-km time-trial, a time saving of 26 s was observed with a power variability of 10%. The largest time savings were found for the hypothetical riders with the lowest mean power output who could vary power to the greatest extent. Our findings confirm that time savings are possible in cycling time-trials if the rider varies power in parallel with hill gradient and wind direction. With a more recent mathematical model, we found slightly greater time savings than those reported by Swain (1997). These time savings compared favourably with the predicted benefits of interventions such as altitude training or ingestion of carbohydrate-electrolyte drinks. Nevertheless, the extent to which such power output variations can be tolerated by a cyclist during a time-trial is still unclear. 相似文献
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The Responsible Anarchist: Postmodernism and social change 总被引：1，自引：0，他引：1
Elizabeth Atkinson 《British Journal of Sociology of Education》2002,23(1):73-87
In recent years, the adoption of postmodern theoretical perspectives within educational research has prompted strong critical reaction. For some critics (particularly Marxist researchers), the greatest fault of postmodernism is that it lacks an agenda for social change. This paper takes issue with this argument, and with four associated arguments: (1) that postmodernism disempowers those to whom it claims to give voice; (2) that it appeals only to intellectuals and has no practical value; (3) that it denies the possibility of the construction of a new social order; and (4) that it colludes with the status quo in its refusal to act. Addressing each of these points in turn, the author suggests that, contrary to the view of these critics, postmodernism offers a powerful force for social change, through the acceptance of uncertainty, the acknowledgement of diversity and the refusal to see concepts such as 'justice' or 'society' as fixed, or as governed by unassailable 'truths'. 相似文献
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Season of birth is related to child retention rates, achievement, and rate of diagnosis of specific LD 总被引：1，自引：0，他引：1
A sizable literature has demonstrated that the achievement of children in early elementary school is related to their season of birth: Those born in summer typically perform less well than those born in the fall. A small literature indicates that more children diagnosed with specific learning disabilities (SLD) are born in the summer. We have begun to explore the possibility that the same processes may account for both outcomes. In order to better understand these processes, the standardized achievement levels and rates of diagnosis of SLD for children born during each season were studied in one geographical area of the State of Georgia served by 28 school districts. Standardized achievement scores in reading, mathematics, and science were reliably lower for those born in the summer. Furthermore, there was a strong relationship between season of birth and the rate at which children received a diagnosis of SLD. Summer-born children were diagnosed with SLD at a higher rate than their peers. Four hypotheses for both the lower performance in the general school population and the greater rate of SLD diagnosis among these children are discussed. 相似文献
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Historically, school leaders have occupied a somewhat ambiguous position within networks of power. On the one hand, they appear to be celebrated as what Ball (2003) has termed the ‘new hero of educational reform'; on the other, they are often ‘held to account’ through those same performative processes and technologies. These have become compelling in schools and principals are ‘doubly bound’ through this. Adopting a Foucauldian notion of discursive production, this paper addresses the ways that the discursive ‘field’ of ‘principal’ (within larger regimes of truth such as schools, leadership, quality and efficiency) is produced. It explores how individual principals understand their roles and ethics within those practices of audit emerging in school governance, and how their self-regulation is constituted through NAPLAN – the National Assessment Program, Literacy and Numeracy. A key effect of NAPLAN has been the rise of auditing practices that change how education is valued. Open-ended interviews with 13 primary and secondary school principals from Western Australia, South Australia and New South Wales asked how they perceived NAPLAN's impact on their work, their relationships within their school community and their ethical practice. 相似文献
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Terry Atkinson 《欧洲师范教育杂志》1997,20(1):101-106
This paper considers the traditional pedagogies underpinning the use of technology in order to deliver learning in educational settings and the lessons that can be drawn for the case of teacher education. It then considers the pedagogy of teacher education itself in order to propose an integrated pedagogical model for the delivery of teacher education by means of the new technologies. It concludes with the view that technology can and should be applied to teacher education but that this might best be viewed as an evolutionary process rather than a revolutionary one. 相似文献