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Energy balance of locomotion with pedal-driven watercraft 总被引:1,自引:0,他引:1
In this study, we examined the mechanics and energetics of locomotion with a paddle-wheel boat and a water bike. Power output (Wtot) was measured directly on the water bike by means of an instrumented chain-ring. The simultaneous assessment of oxygen uptake (VO2) allowed the computation of the "overall" efficiency of locomotion (etao = Wtot/VO2). Mean etao was 0.27 (s = 0.02), which was unaffected by the speed, and was assumed to be the same for the two boats as both are semi-recumbent bicycles. For the paddle-wheel boat, Wtot was then obtained from etao and measures of VO2. The power to overcome (passive) drag was calculated as Wd = D x v (where D is the force measured by means of a load cell when towing the boats at given speeds). Propelling efficiency was calculated as etap = Wd/Wtot, which was lower with the paddle-wheel boat (mean 0.35, s = 0.01) than with the water bike (mean 0.57, s = 0.01). The observed differences in etap and Wd explain why at the highest speed tested (approximately 3 m s(-1), the energy required to cover a unit distance with the water bike is similar to that required to move the paddle-wheel boat at 1.3 m s-1). 相似文献
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Barbara Ann Cole 《欧洲特需教育杂志》2013,28(3):287-307
This paper considers the role of the Special Educational Needs Coordinator (SENCO), the teacher responsible for the implementation of policies relating to the teaching and learning of children with special educational needs (SEN) in mainstream schools in England and Wales. SENCOs also have a role to play in the inclusion of children with learning difficulties/disabilities in mainstream schools. Yet research indicates that despite the revision of the Special Educational Needs Code of Practice in 2001, many SENCOs are still overwhelmed by the operational nature of the role with little support, time or funding to consider more strategic aspects of inclusion and SEN. The article draws on research by the author and offers the voices of SENCOs from two unitary authorities in the north of England which suggest that where the SENCO is supported by senior management within the school, the role can be a powerful one in relation to inclusion. It concludes by arguing that the role of the SENCO needs to be re‐conceptualized, redefined and remunerated as a senior management post within mainstream schools. If this were to be enforced by national policy, every mainstream school could have at least one powerful advocate for the inclusion of children with learning difficulties/disabilities. 相似文献
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Abstract The Florida Teletraining Project tested the feasibility of using community colleges as providers of various types of military training to personnel in the Reserve Components (RC). Training was delivered via the Army's TNET system, which employs two‐way interactive video. Five courses were produced, delivered, and evaluated during the project. Results showed that effective military course reconfiguration can be accomplished by civilian institutions, that the delivery system was technically reliable, that students performed well using specially reconfigured courseware, and that students rated the video teletraining approach as effective. The project demonstrated the potential of two‐way video teletraining for a variety of military training applications for several different levels of military personnel. 相似文献
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Clinton E. Miller Barbara K. Mullins 《International Journal of Lifelong Education》2013,32(5):474-484
The purpose of this paper is to identify domestic violence as a social problem, provide background information concerning domestic violence, identify strategies related to adult education currently being used to address the problem of domestic violence and examine the philosophical underpinnings of the programmes. Domestic violence is not only a legal problem, but represents a substantial public health issue and is one of the most overlooked social problems of today. As a result of increased public awareness concerning domestic violence in the late 1980s, there have been many changes in laws and training. Educational programmes have been established for both offenders and public officials who may come in contact with the victims. These programmes range from those based on behaviourist philosophy to those on humanist philosophy and are offered by the courts, community agencies, health care providers and in the workplace. Programmes to reduce domestic violence and efforts of multiple social institutions illustrate the use of adult education as a catalyst for social change. 相似文献