Decreasing Internal Focus of Attention Improves Postural Control During Quiet Standing in Young Healthy Adults     

Gilel Nafati  Nicolas Vuillerme 《Research quarterly for exercise and sport》2013,84(4):634-643

This experiment was designed to investigate whether and how decreasing the amount of attentional focus invested in postural control could affect bipedal postural control. Twelve participants were asked to stand upright as immobile as possible on a force platform in one control condition and one cognitive condition. In the latter condition, they performed a short-term digit-span memory task. Decreased center-of-gravity displacements and decreased center-of-foot-pressure displacements minus center-of-gravity displacements were observed in the cognitive condition relative to the control condition. These results suggest that shifting the attentional focus away from postural control by executing a concurrent attention-demanding task could increase postural performance and postural efficiency.  相似文献   

Quantifying the nature of anticipation in professional tennis     

Celine Triolet  Nicolas Benguigui  Cyrille Le Runigo  A. Mark Williams 《Journal of sports sciences》2013,31(8):820-830

Abstract

We quantify the nature and frequency of anticipation behaviours in professional tennis using video coding of incidents where the time delay between the opponent's stroke and the reaction of the player were recorded. We argue that anticipation is based on uncertain information and should lead in some situations to erroneous decisions. We identified the transition between reaction (with 100% accuracy in the selection of where the ball is played on the court) and anticipation (with less than 100% accuracy) as being 140–160 ms after ball contact. Anticipation behaviours occurred on between 6.14% and 13.42% of the coded situations. These anticipation behaviours appeared almost exclusively in ‘unfavourable’ situations, where the opponent had a significant tactical advantage, with the type of playing surface having only a limited effect. Moreover, the decrease in accuracy with shorter response times is not monotonic, with an increase in response accuracy being observed for times shorter than 120 ms before ball contact. We propose that very early anticipation behaviours occur when players use significant context-specific information before the opponent's stroke. When such information is not available, players produce anticipation behaviours that are closer to the moment of ball–racket contact using information that is more likely to be based on the opponent's preparation of the stroke. This study opens new directions for research focusing on the testing and training of anticipation in fast ball sports.  相似文献   

Training effects on contrafreeloading in rats housed in operant chambers     

Robert D. Tarte  Charles T. Rasmussen 《Learning & behavior》1979,7(1):69-74

Four rats were trained to press a bar for food pellets and then were housed in operant chambers for 6 continuous days of choice-testing between obtaining pellets freely or by barpressing. There were two additional 3-day choice periods following more barpress training. It was found that (1) animals preferred to secure food by barpressing when initially placed in the choice situation and immediately following additional barpress training; (2) there was a subsequent decrease to very low levels of response-dependent food taken during choice testing; and (3) opening the chambers for daily maintenance during choice-testing caused a temporary increase in barpressing for food. Thus the previously reported stability of high rates of barpressing in the presence of free food is, at least in part, dependent upon short testing sessions.  相似文献   

Improving information retrieval using Medical Subject Headings Concepts: a test case on rare and chronic diseases     

SJ Darmoni  LF Soualmia  C Letord  MC Jaulent  N Griffon  B Thirion  A Névéol 《Journal of the Medical Library Association : JMLA》2012,100(3):176-183

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Using Food Science Demonstrations to Engage Students of All Ages in Science,Technology, Engineering,and Mathematics (STEM)     

Shelly J. Schmidt  Dawn M. Bohn  Aaron J. Rasmussen  Elizabeth A. Sutherland 《Journal of Food Science Education》2012,11(2):16-22

Abstract: The overarching goal of the Science, Technology, Engineering, and Mathematics (STEM) Education Initiative is to foster effective STEM teaching and learning throughout the educational system at the local, state, and national levels, thereby producing science literate citizens and a capable STEM workforce. To contribute to achieving this goal, we have assembled six food science demonstrations for use at all educational levels and have presented these lessons to students at the elementary through higher education levels. The focus of this article is to share these food science demonstrations and our experiences using them so that others can use them for engaging students in STEM disciplines, through food science, at any educational level. Featured demonstrations include: (1) liquid nitrogen ice cream: a matter of changing phases, (2) seeing our senses work together, (3) whipping up the cream, (4) milk versus dark: what is the difference?, (5) counting calories by burning them, and (6) culinary spherification: the wonders of cross‐linking. Overall, our experience with using these demonstrations has been very positive. Students appear engaged in the learning process and love to consume the demonstration end products. Downloadable handouts containing demonstration details for each demonstration are available as supporting information.  相似文献   

Were Women Really Underrepresented in Media Coverage of Summer Olympic Games (1984–2008)? An Invitation to Open a Methodological Discussion Regarding Sex Equity in Sports Media     

Nicolas Delorme 《Mass Communication and Society》2014,17(1):121-147

In previous literature, there is an important heterogeneity in how to proceed to determine whether media coverage of the Summer Olympics in relation to athletes' sex is equitable. Therefore, the aims of this study are to determine the most appropriate standards for this comparison and to use them to assess whether there are biases in the journalistic coverage of the Summer Games, using data from previous studies (n = 18). Results show that media coverage is far from being detrimental to women: They are either equitably represented (28.79%) or significantly overrepresented (46.97%). Indeed, all modalities combined, women are only underrepresented in 22.24% of cases. In most cases, these results significantly differ from those of previous research and stress the importance of and the need to take methodological precautions in this type of study.  相似文献   

Lifelong learning policy in two national contexts     

Palle Rasmussen 《International Journal of Lifelong Education》2014,33(3):326-342

This article describes and discusses the development of lifelong learning policy in two EU member states, Denmark and Portugal. The purpose is to show how different societal and historical contexts shape the development and implementation of lifelong learning policies, even though these policies have significant common elements. As a basis for the discussion an inventory of policy elements is presented. Denmark and Portugal have been chosen as examples of smaller EU member states with different historical, social and cultural characteristics. Developments and policies in the two countries, including the links with EU education policy, are described. The discussion includes comparison drawing on the inventory of policy elements. A main conclusion is that the different historical trajectories of the two countries remain very important for present-day education and for the advancement of lifelong learning policy. Early development of public primary education and popular adult education has provided a strong foundation for lifelong learning policy in Denmark while in Portugal not only institutional provision but also popular demand for lifelong learning has had to be built up relatively recently. EU education policy has had much more impact on lifelong learning policy in Portugal than in Denmark, because Portugal has had to depend much more on economic support from the EU social fund.  相似文献   

Using Ancient Chinese and Greek Astronomical Data: A Training Sequence in Elementary Astronomy for Pre-Service Primary School Teachers     

Cécile de Hosson  Nicolas Décamp 《Science & Education》2014,23(4):809-827

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Investigation of the hydro-mechanical behaviour of fouled ballast   总被引：1，自引：0，他引：1  

Yu-jun CUI  Trong Vinh DUONG  Anh Minh TANG  Jean-Claude DUPLA  Nicolas CALON  Alain ROBINET 《浙江大学学报(A卷英文版)》2013,14(4):244-255

In this study, a fouled ballast taken from the site of Sénissiat, France, was investigated. For the hydraulic behaviour, a large-scale cell was developed allowing drainage and evaporation tests to be carried out with monitoring of both suction and volumetric water content at various positions of the sample. It was observed that the hydraulic conductivity of fouled ballast is decreasing with suction increase, as for common unsaturated soils. The effect of fines content was found to be negligible. For the mechanical behaviour, both monotonic and cyclic triaxial tests were carried out using a large-scale triaxial cell. Various water contents were considered. The results were interpreted in terms of shear strength and permanent axial strain. It appeared that the water content is an important factor to be accounted for since any increase of water content or degree of saturation significantly decreases the shear strength and increases the permanent strain. Constitutive modelling has been attempted based on the experimental results. The model in its current state is capable of describing the effects of stress level, cycle number and water content.  相似文献   

Book Publishing     

Nicolas Barker  Peter Sutcliffe  Mary Hill  Wendell Cochran  Stanley Rice  Stanley Rice 《Communication Booknotes Quarterly》2013,44(10):154-155

The Oxford University Press and the Spread of Learning: An Illustrated History, by Nicolas Barker (London and New York: Oxford University Press, 1978 —$25.00)

The Oxford University Press: An Informal History, by Peter Sutcliffe (London and New York: Oxford University Press, 1978—$15.00)

Mary Hill and Wendell Cochran's Into Print: A Practical Guide to Writing, Illustrating, and Publishing (Los Altos, Calif.: William Kaufmann, Inc., 1977—$12.00/6.951)

Stanley Rice's Book Design: Systematic Aspects (274 pp., $17.50)

Stanley Rice's Book Design: Text Format Models (215 pp., $17.50)

John Y. Cole, ed. The Library of Congress in Perspective: A Volume Based on the Reports of the 1976 Librarian's Task Force and A visory Groups (New York: R.R. Bowker, 1978—$21.95)

Literary Market Place: 1978 Edition (New York: R.R. Bowker, 1978— $22.50, paper)  相似文献