我国竞技体育职业化诚信危机根源及对策

文章从文化、政治、制度、法律等四个方面分析了中国体育职业化过程中诚信危机产生的原因,提出了我国体育职业化、产业化进程中诚信建设的对策,即:1.进一步明晰各职业联赛的产权归属及各俱乐部的产权。2.建立完善的诚信制度和体系,包括建立健全信用政策法规体系、建立和完善社会信用联合征信系统,增加失信者的社会道德风险。3.强化市场监督管理,建立健全诚信建设的制度规范。4.减少短期行为及不确定性。     

构建高校武术教师综合素质要求体系的研究

随着知识经济的发展和终身教育时代的到来,综合能力培养是时代发展的必然趋势。建设高校武术教师终身学习意识势在必行,构建当代高校武术教师应具备的素质,旨在使高校武术教师清晰明白培养学习意识对自身素质的要求、自身素质对学生的影响。为适应教育改革和知识经济时代,高校武术教师必须坚定终身教育、终身学习的理念,整合和优化自身素质。     

戏曲村最后一个走书先生

我这几天真有点发愁:正月里在低塘街道历山村唱了20天,接着便赶到东村去唱5天,再去下一个预约的邵巷村唱20天。可东村的听书迷听了不过瘾,     

黑点树蛙、双团棘胸蛙的染色体核型与Ag-NORs的研究

通过对黑点树蛙、双团棘胸蛙的染色体核型和Ag-NORs的研究,其结果黑点树蛙2n=26=22m 4sm(5 8),NF=52,No.8、10染色体臂上各有一次缢痕,Ag-NORs位于No.10短臂;双团棘胸蛙2n=64,NF=64,全为端部着丝粒染色体,有一次缢痕,位于No.10,且异型.     

Describing the plastic deformation of aluminium softball bats

Hollow aluminium bats were introduced over 30 years ago to provide improved durability over wooden bats. Since their introduction, however, interest in hollow bats has focused almost exclusively around their hitting performance. The aim of this study was to take advantage of the progress that has been made in predicting bat performance using finite elements and apply it to describe bat durability. Accordingly, the plastic deformation from a ball impact of a single-wall aluminum bat was numerically modelled. The bat deformation from the finite-element analysis was then compared with experiment using a high-speed bat test machine. The ball was modelled as an isotropic, homogeneous, viscoelastic sphere. The viscoelastic parameters of the ball model were found from instrumented, high-speed, rigid-wall ball impacts. The rigid-wall ball impacts were modelled numerically and showed good agreement with the experimentally obtained response. The strain response of the combined bat-ball model was verified with a strain-gauged bat at intermediate ball impact speeds in the elastic range. The strain response of the bat-ball model exhibited positive correlation with the experimental measurements. High-speed bat-ball impacts were performed experimentally and simulated numerically at increasing impact speeds which induced correspondingly increased dent sizes in the bat. The plastic deformation from the numerical model found good agreement with experiment provided the aluminium work hardening and strain rate effects were appropriately described. The inclusion of strain rate effects was shown to have a significant effect on the bat deformations produced in the finite-element simulations. They also helped explain the existence of high bat stresses found in many performance models.