The force-time profile of elite front crawl swimmers     

Formosa DP  Mason B  Burkett B 《Journal of sports sciences》2011,29(8):811-819

In this study, we used recently developed technology to determine the force-time profile of elite swimmers, which enabled coaches to make informed decisions on technique modifications. Eight elite male swimmers with a FINA (Federation Internationale de Natation) rank of 900+ completed five passive (streamline tow) and five net force (arms and leg swimming) trials. Three 50-Hz cameras were used to video each trial and were synchronized to the kinetic data output from a force-platform, upon which a motorized towing device was mounted. Passive and net force trials were completed at the participant's maximal front crawl swimming velocity. For the constant tow velocity, the net force profile was presented as a force-time graph, and the limitation of a constant velocity assumption was acknowledged. This allowed minimum and maximum net forces and arm symmetry to be identified. At a mean velocity of 1.92+0.06 m s?1, the mean passive drag for the swimmers was 80.3+4.0 N, and the mean net force was 262.4+33.4 N. The mean location in the stroke cycle for minimum and maximum net force production was at 45% (insweep phase) and 75% (upsweep phase) of the stroke, respectively. This force-time profile also identified any stroke asymmetry.  相似文献   

Understanding Complex Ecosystems Through an Agent-Based Participatory Watershed Simulation     

Jeong  Soojeong  Elliott  Jennifer B.  Feng  Zhang  Feldon  David F. 《Journal of Science Education and Technology》2022,31(5):691-705

Journal of Science Education and Technology - The properties and functions of complex systems apply across a variety of domains of science and are at the heart of the solutions to many global...  相似文献   

MARC: A Thought Experiment in the Morality of Automated Marking of English     

Victoria Elliott 《Changing English: An International Journal of English Teaching》2014,21(4):393-401

Automated essay scoring programs are becoming more common and more technically advanced. They provoke strong reactions from both their advocates and their detractors. Arguments tend to fall into two categories: technical and principled. This paper argues that since technical difficulties will be overcome with time, the debate ought to be held in terms of the principles. A thought experiment, based on a technically perfect Automated Essay Scorer, is proposed in order to explore the moral questions related to this topic, such as whether students deserve to have their work read by a human. It concludes that affect is an important component both of writing and of the debate, but that if the move to automated scoring stops being an ‘all or nothing’ debate, then many of the objections on principle will be obviated.  相似文献   

Introduction to the Special Issue: Probing the Nexus of Migration,Religion, and Education     

Bruce Collet 《Diaspora, Indigenous, and Minority Education》2014,8(2):55-58

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Chan teaching and learning: an aesthetic analysis of its educational import     

Lingqi Meng  P. Bruce Uhrmacher 《Asia Pacific Education Review》2014,15(2):199-209

This study examines the sudden enlightenment sect of Chan (or Zen in Japanese terms) in order to understand various aspects of teaching and learning in the Buddhist tradition in China. To unravel Chan’s educational import, we analyze its aesthetic features through a Western lens in order to highlight significant aspects of the teaching/learning process. Using connections, risk taking, imagination, sensory experience, perceptivity, and active engagement, a six-theme framework in the Western aesthetic education literature, we summarize five characteristics of Chan teaching and learning that specifically facilitates learners to be actively engaged and connected in their learning and modestly facilitates the learner’s sensory experience and imagination. We argue that Chan’s teaching and learning do not enable learners to take risks or to become overly perceptive. These aesthetic features might make Chinese learners more able learners in a lecture-directed learning environment that is usually associated with ineffective learning in Western teaching and learning discourse. Lack of risk taking in Chan tradition might relate to the lack of creative thinking in China, which still needs more in-depth exploration.  相似文献   

Optimizing Learning of Scientific Category Knowledge in the Classroom: The Case of Plant Identification     

Bruce K. Kirchoff  Peter F. Delaney  Meg Horton  Rebecca Dellinger-Johnston 《CBE life sciences education》2014,13(3):425-436

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Examining the specificity of practice hypothesis: is learning modality specific?     

J Coull  L Tremblay  D Elliott 《Research quarterly for exercise and sport》2001,72(4):345-354

The specificity of practice hypothesis was examined using a tracking task. In Experiment 1, visual or auditory feedback about performance was provided. Vision was more useful than audition early in acquisition. Performance gains found in acquisition were maintained during retention, but learning was specific only if the acquisition modality was visual. Specificity did not increase with the amount of practice. In Experiment 2, visual and auditory information were combined. Again, the specificity of practice hypothesis was supported. Also, instructing participants to attend to one information source allowed us to demonstrate that information can be explicitly or implicitly processed. Further, specificity effects may occur because of different rates of development for error detection and correction processes.  相似文献   

Experimental analysis of proximity as a social stimulus: Increasing on‐task behavior of an adolescent with autism     

Susan M. Wilczynski  Iantha Fusilier  Melanie Dubard  Amy Elliott 《Psychology in the schools》2005,42(2):189-196

Experimental analysis of social stimuli has typically been restricted to the presence or absence of verbal attention. In the present study, an ABAB design was used to assess the influence of proximity as a social stimulus. Close and distant proximity of a familiar adult was systematically manipulated to evaluate the effect of proximity on the on‐task behavior of a 15‐year‐old male with autism. Baseline, experimental analysis, and intervention phases were conducted within a self‐contained classroom. Pronounced effects of distant educator proximity to the participant were evident during both the experimental analysis and intervention, with increased on‐task behavior occurring in the distant condition. Future recommendations for the investigation of proximity as a relevant social stimulus are forwarded. © 2005 Wiley Periodicals, Inc. Psychol Schs 42: 189–196, 2005.  相似文献   

The Disengaged Academic: the Retreat from Citizenship     

Bruce Macfarlane 《Higher Education Quarterly》2005,59(4):296-312

Citizenship education has developed against the backdrop of civic disengagement. However, as attention has focused on the incorporation of citizenship education into the school curriculum, the responsibilities of citizenship incumbent on the academic community within higher education has been largely overlooked. This paper examines the reasons for the apparent decline of academic citizenship through an analysis of three elements of citizenship. It argues that the erosion of academic self‐governance has led to the decline of political literacy in academic life and that a range of other forces, including under‐funded massification and research audit, have damaged social and moral responsibility and the responsibilities implied by community involvement. It is concluded that adjustments to reward and recognition structures and professorial leadership are vital if the academic is not to become increasingly disengaged from the service role.  相似文献   

A Normativist Account of Language‐Based Learning Disability1,2     

J. Bruce Tomblin 《Learning disabilities research & practice》2006,21(1):8-18

Research on learning disabilities (LD) depends upon a conceptual framework that specifies what it should explain, what kinds of data are needed, and how these data are to be arranged in order to provide a meaningful explanation. An argument is made that LD are no different in this respect than any other form of human illness. In this article, a theory of LD based on weak normativism drawn from the philosophy of medicine is presented. This theory emphasizes that cultural values (norms) determine which aspects of human experience and function are instances of ill health. Thus, ill health is fundamentally normative. However, the experiences and behaviors themselves arise out of the natural world and therefore can be explained by a culturally neutral natural science. Data from a longitudinal study of specific language impairment are used to show that academic achievement is culturally evaluated, that low achievement is disvalued, and that therefore actions are taken to help the poor achiever. Spoken language abilities in kindergarten are associated with judgments of the adequacy of fourth grade academic achievement and are mediated by reading prior to fourth grade and also via a path that is independent of reading. It is argued that poor academic achievement may be viewed as a disvalued state consistent with an illness, whereas language and reading skills can be viewed as basic causal systems that can explain the child's learning performance. Properties of this causal system are value free, except that they can inherit disvalue by their association with poor achievement. It remains to be determined whether the notion of LD is to be equated with poor achievement and therefore serve as a type of illness or whether it is to be viewed as a particular cause of poor achievement and thus functions as a type of disease associated with poor achievement. The conceptual framework lays out the alternative meanings for LD and the choice between these alternatives will ultimately depend on how it is used in the LD research community.  相似文献