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Abstract The aim of this study was to examine the effect of positioning on the correctness of decision making of top-class referees and assistant referees during international games. Match analyses were carried out during the Fédération Internationale de Football Association (FIFA) Confederations Cup 2009 and 380 foul play incidents and 165 offside situations were examined. The error percentage for the referees when indicating the incidents averaged 14%. The lowest error percentage occurred in the central area of the field, where the collaboration of the assistant referee is limited, and was achieved when indicating the incidents from a distance of 11-15?m, whereas this percentage peaked (23%) in the last 15-min match period. The error rate for the assistant referees was 13%. Distance of the assistant referee to the offside line did not have an impact on the quality of the offside decision. The risk of making incorrect decisions was reduced when the assistant referees viewed the offside situations from an angle between 46 and 60°. Incorrect offside decisions occurred twice as often in the second as in the first half of the games. Perceptual-cognitive training sessions specific to the requirements of the game should be implemented in the weekly schedule of football officials to reduce the overall error rate. 相似文献
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Santiago Veiga Antonio Cala Pablo G. Frutos Enrique Navarro 《Sports biomechanics / International Society of Biomechanics in Sports》2014,13(3):285-295
The aim of this study was to compare the race characteristics of the start and turn segments of national and regional level swimmers. In the study, 100 and 200-m events were analysed during the finals session of the Open Comunidad de Madrid (Spain) tournament. The “individualized-distance” method with two-dimensional direct linear transformation algorithm was used to perform race analyses. National level swimmers obtained faster velocities in all race segments and stroke comparisons, although significant inter-level differences in start velocity were only obtained in half (8 out of 16) of the analysed events. Higher level swimmers also travelled for longer start and turn distances but only in the race segments where the gain of speed was high. This was observed in the turn segments, in the backstroke and butterfly strokes and during the 200-m breaststroke event, but not in any of the freestyle events. Time improvements due to the appropriate extension of the underwater subsections appeared to be critical for the end race result and should be carefully evaluated by the “individualized-distance” method. 相似文献
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Based on a carefully selected list of references in Spanish, the following text presents a brief history of the magic lantern in Spain, from its invention to the beginning of its decadence as a social medium of communication. The magic lantern emerged in the seventeenth century, with the application of a series of physical principles that allowed the first attempts and experiences of image projection, such as the one described by Juana Inés de la Cruz in Sueño, a silva strophe published in Seville in 1692. As a device, the magic lantern finally was consolidated during the last quarter of the eighteenth century, mainly due to the popular sessions of phantasmagorias, which, in Spain, were run by projectionists such as Juan González Mantilla, or Robertson himself. After the magic lantern became institutionalized and commercialized throughout the whole Iberian Peninsula—the same as in the rest of Europe—its decline took place in the last decade of the nineteenth century, when it had to compete with the cinematograph. 相似文献
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Hélène Gorring BA MSc FCLIP Denise Duffy BA DipLis Alison Forde BA PG DipLib MEd Donna Irving MCLIP FHEA Katherine Morgan Katie Nicholas BA MA MCLIP 《Health information and libraries journal》2023,40(1):114-119
The research goals were to obtain an understanding of who the users of e-books in the NHS are, what they are using e-books for, and when and how they use them. This article presents the methodology used and the findings from the research. It also explores the outputs and next steps from the research, both for the individual countries and collectively. The Five Nations group, (library leads in England, Northern Ireland, Ireland, Scotland and Wales) commissioned research into healthcare staff use and non-use of e-books to understand the behaviours, needs and expectations of healthcare staff and to identify shared challenges around e-books to inform policy and practice. 相似文献
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