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数学建模解题流程及思维的探索
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作者 龚依 李媛媛 +3 位作者 应丹 王思媛 张媛 刘莹 《数学学习与研究》 2016年第7期84-84,共1页
数学建模竞赛赛题的水平主要表现在其综合性,实用性,创新性等方面,本文旨在对赛题的研究,解决问题的方法,和题目类型作出一些简单的分析常用方法与技巧,并由此总结出参加数学建模需要必备的模型知识、数学能力、逻辑思维等条件,加强我... 数学建模竞赛赛题的水平主要表现在其综合性,实用性,创新性等方面,本文旨在对赛题的研究,解决问题的方法,和题目类型作出一些简单的分析常用方法与技巧,并由此总结出参加数学建模需要必备的模型知识、数学能力、逻辑思维等条件,加强我们数学建模的能力与素养. 展开更多
关键词 赛题研究 模型更新 算法改进
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Women's football:Player characteristics and demands of the game
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作者 Vanessa Martínez-Lagunas Margot Niessen Ulrich Hartmann 《Journal of Sport and Health Science》 SCIE 2014年第4期258-272,共15页
The number of scientific investigations on women's football specific to the topics of player characteristics and demands of the game has considerably increased in recent years due to the increased popularity of the w... The number of scientific investigations on women's football specific to the topics of player characteristics and demands of the game has considerably increased in recent years due to the increased popularity of the women's game worldwide, although they are not yet as numerous as in the case of men's football. To date, only two scientific publications have attempted to review the main findings of studies published in this area. However, one of them was published about 20 years ago, when women's football was still in its infancy and there were only a few studies to report on. The other review was more recent. Nonetheless, its main focus was on the game and training demands of senior elite female players. Thus, information on female footballers of lower competitive levels and younger age groups was not included. Consequently, an updated review is needed in this area. The present article therefore aims to provide an overview of a series of studies that have been published so far on the specific characteristics of female football players and the demands of match-play. Mean values reported in the literature for age (12-27 years), body height (155-174 cm), body mass (48-72 kg), percent body fat (13%-29%), maximal oxygen uptake (45.1-55.5 mL/kg/min), Yo-Yo Intermittent Recovery Test Level l (780-1379 m), maximum heart rate (189-202 bpm), 30 m sprint times (4.34-4.96 s), and counter- movement jump or vertical jump (28-50 cm) vary mostly according to the players' competitive level and positional role. There are also some special considerations that coaches and other practitioners should he aware of when working with female athletes such as the menstrual cycle, potential pregnancy and lactation, common injury risks (particularly knee and head injuries) and health concerns (e.g., female athlete triad, iron deficiency, and anemia) that may affect players' football performance, health or return to play. Reported mean values for total distance covered (4-13 km), distance covered at high-speed (0.2-1.7 km), average/peak heart rate (74%-87%/94%-99% HRmax), average/peak oxygen uptake (52%-77%/96%-98% VO2max), and blood lactate (2.2-7.3 mmol/L) during women's football match-play vary according to the players' competitive level and positional role. Methodological differences may account for the discrepancy of the reported values as well. Finally, this review also aims to identify literature gaps that require further scientific research in women's football and to derive a few practical recom-mendations. The information presented in this report provides an objective point of reference about player characteristics and game demands at various levels of women's football, which can help coaches and sport scientists to design more effective training programs and science-based strategies for the further improvement of players' football performance, health, game standards, and positive image of this sport. 展开更多
关键词 Female soccer players Match-play requirements Physical and physiological profiles
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