构建电子实物模块展示平台初探     

黄宏格 《湖南科技学院学报》2005,26(11):63-64

针对如何学好电子技术这门课程,强调实践教学,从增强学生对电子元器件的感性认识入手,使学生理论联系实际.阐述了构建电子实物模块的意义、具体方案和实际效果.  相似文献   

化学创新与新型农业     

汪明礼 《黄山学院学报》2004,6(3):61-66

就化学创新及其在农业上的应用方面进行了综述,主要叙述了化学创新与现代农业的关系及发展前景.本文引用了文献19篇.  相似文献   

轴类零件的数控车削工艺分析   总被引：1，自引：0，他引：1  

罗平尔 《常熟理工学院学报》2007,21(2):67-71

通过典型轴类零件数控加工工艺的对比分析,从装夹、刀具、切削用量等方面提出了零件的技术性能、生产率、经济性等优化目标,对实际生产加工具有指导意义。  相似文献   

A Coding System to Quantify Powerful Actions in Soccer Match Play: A Pilot Study     

Conall F. Murtagh  Robert J. Naughton  Allistair P. McRobert  Andrew O’Boyle  Ryland Morgans  Barry Drust 《Research quarterly for exercise and sport》2019,90(2):234-243

Purpose: The powerful activity profile of elite soccer match play has not been documented appropriately to inform specific maximal power assessment and development criteria. The aims of the current study were to develop a reliable soccer-specific powerful action (SSPA) notational analysis coding system that could be used to compare frequency and durations of powerful actions during elite youth soccer match play. Methods: Sixteen elite male English Premier League (EPL) Academy players (19 ± 1 yrs) were recorded by an individual camera during 16 competitive EPL U18 and U21 games. Video footage was analyzed using performance analysis software and SSPAs were coded according to the following categories: initial acceleration, leading acceleration, sprint, unilateral jump and bilateral jump. Results: The SSPA coding system demonstrated very good inter- and intra-rater reliability (kappa coefficients ≥ 0.827). Elite youth EPL soccer players undertook significantly more initial (31 ± 9) and leading (37 ± 12) accelerations than sprints (8 ± 3; p = .014, d = 1.7, and p < .001, d = 1.7, respectively) and jumps (6 ± 5; p = .002, d = 1.7 and p < .001, d = 1.7, respectively). Players performed a significantly greater number of initial and leading accelerations with action durations below 1.5 s compared to above 1.5 s (p = .001, d = 1.6, and p = .002, d = 1.4), respectively. Conclusions: Our SSPA coding system provides a reliable observational instrument for quantifying the frequency and duration of powerful actions performed during elite soccer match play. In our sample of elite youth soccer players, horizontal accelerations of short duration (< 1.5 s) from different starting speeds appear the most dominant powerful action in elite youth soccer match play.  相似文献   

血液有形成分对足球运动员有氧能力的影响     

王晶  张立 《安徽体育科技》2009,30(2):53-56

目的：分析血液有形成分某些指标对足球运动员有氧能力的影响,比较不同有氧能力运动员联赛期间血液有形成分变化特点。方法：测定18名足球运动员联赛前和联赛中期血液有形成分指标;采用递增负荷跑台运动方式,测定联赛前反映最大有氧能力的相关生理指标。结果：1,红细胞比容、平均红细胞体积与最大摄氧量显著负相关。2,联赛中期,一般有氧能力组运动员血液有形成分变化比优秀有氧能力组明显。结论：1,血液有形成分在一定范围内影响运动员有氧能力。2,优秀有氧能力运动员对足球联赛大强度运动适应能力强,生理反应较平稳。  相似文献