Force transducer system for measurement of ice hockey skating force     

Tyler J. Stidwill  Rene Albert Turcotte  Phil Dixon  David J. Pearsall 《Sports Engineering》2009,12(2):63-68

The purpose of this study was to develop a portable force measurement system for ice hockey skating. The system consisted of three strain gauge pairs affixed to an ice hockey skate’s blade holder with wire leads connected to a microprocessor controlled data acquisition device carried in a backpack worn by the skater. The configuration of the strain gauges simultaneously determined the vertical and medial–lateral force components experienced by the blade holder with a resolution accuracy of 1.9 N and a coefficient of variation of 9.2%. On-ice testing of this system with subjects performing forward start, acceleration, and constant velocity skating permitted unencumbered, natural movement and demonstrated clear, unambiguous signal responses, high trial-to-trial repeatability, and easy data retrieval. The practicality and accuracy of this testing approach have many applications, such as a quantitative tool for skating force assessment to aid athletes and coaches, as well as providing the means to examine other skill-specific dynamics.  相似文献   

David Harris Russell     

Fred T. Tyler 《教育心理学家》2013,48(2)

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Differences in activation patterns between eccentric and concentric quadriceps contractions.     

Malachy P McHugh  Timothy F Tyler  Scott C Greenberg  Gilbert W Gleim 《Journal of sports sciences》2002,20(2):83-91

Previous studies analysing electromyograms (EMGs) from indwelling electrodes have indicated that fast-twitch motor units are selectively recruited for low-intensity eccentric contractions. The aim of this study was to compare the frequency content of surface EMGs from quadriceps muscles during eccentric and concentric contractions at various contraction intensities. Electromyograms were recorded from the rectus femoris, vastus lateralis and vastus medialis muscles of 10 men during isokinetic (1.05 rad x s(-1)) eccentric and concentric knee extension contractions at 25%, 50%, 75% and 100% of maximal voluntary contraction (MVC) for each contraction mode. Additionally, isometric contractions (70 degrees) were performed at each intensity. The mean frequency and root mean square (RMS) of the surface EMG were computed. Mean frequency was higher for eccentric than concentric contractions at 25% (P < 0.01), 50% (P < 0.01) and 75% (P < 0.05) but not at 100% MVC. It increased with increasing contraction intensity for isometric (P < 0.001) and concentric (P < 0.01) contractions but not for eccentric contractions (P = 0.27). The EMG amplitude (RMS) increased with increasing contraction intensity similarly in each contraction mode (P < 0.0001). Higher mean frequencies for eccentric than concentric contractions at submaximal contraction intensities is consistent with more fast-twitch motor units being active during eccentric contractions.  相似文献   

Using the Ecosystemic Approach to Change Chronic Problem Behaviour in Primary Schools     

Ken Tyler  & Brynley Jones 《Pastoral Care in Education》1998,16(4):11-20

This paper describes a small‐scale study of what the authors describe as the ecosystemic approach to changing chronic problem behaviour. The study was undertaken with a group of twelve Leicestershire primary teachers. The technique is briefly described and then teachers' responses to it and its effectiveness are discussed. Four case study examples are presented and finally its potential is considered. Although in this case the work was undertaken with primary teachers, this is an approach which could also be useful at secondary level.  相似文献   

Privacy risk quantification in education data using Markov model     

Dinusha Vatsalan  Thierry Rakotoarivelo  Raghav Bhaskar  Paul Tyler  Djazia Ladjal 《British journal of educational technology : journal of the Council for Educational Technology》2022,53(4):804-821

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From Confrontation to Accommodation: Home Schooling in South Carolina     

Zan Peters Tyler  James C. Carper 《Peabody Journal of Education》2013,88(1-2):32-48

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Intellectuals,Youth, and the Politics of the Conjuncture: A Conversation with Lawrence Grossberg     

Tyler J. Pollard 《Review of Education, Pedagogy & Cultural Studies》2014,36(3):225-245

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Serials management: integration and enhancement through reorganization     

Tyler Goldberg  David Horvath  Eric Neagle 《Library Collections, Acquisitions, and Technical Services》2001,25(4):37

It is broadly acknowledged that effective serials management supports and requires a close link between the staff in technical and public services. More recently, new technological opportunities combined with changes in library organization and administration have greatly facilitated this linkage. The nature and structure of a library’s organization can aid in and benefit from this connectedness. Departments in the University of Louisville’s public and technical services areas began a cooperative effort to maintain serials records in the online catalog in the early 1990s. With reorganization in the late 1990s, a new team structure emerged which further facilitated this effort. In return, this cooperation and the tools that it has created support the teams in a new user-centered approach to serials management.  相似文献   

Results of a Pilot Study to Investigate Community College Student Perceptions of the Value of an Online Health-Risk Reduction Program     

Elizabeth Donovan  Jack Hernandez  Emil Chiauzzi  Pronabesh DasMahapatra  Tyler Achilles  Amanda Hemm 《Community College Journal of Research & Practice》2013,37(10):821-825

Health is associated with academic success. Universal, web-based interventions to reduce risks associated with alcohol and other drug use have been found to be effective at changing four-year college students’ health behaviors. An online health program may also be well-suited to a community college population, as it can reach students off campus and can be accessed at times that are convenient for students. The purpose of the current paper is to report the results of a community college student evaluation of a fully-developed, online health risk reduction program. One hundred and thirty four students evaluated the program. Students perceived the program to be successful at addressing college health and wellness issues, and they considered it a tool that could help students make a healthy adjustment to college. A universal, online, health-risk reduction program may have the potential to be a useful component of a community college's overall prevention strategy.  相似文献   

Erratum     

I. Keith Tyler 《Educational technology research and development : ETR & D》1960,8(6):97-97

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