动作协调形态的获得与视觉通路的发展有密切关系,而视觉通路的信息加工起始于视觉信息的选择。使用德制头戴式i View X HED4眼动仪对不同运动水平的儿童乒乓球选手在接发球时的视觉焦点加以考察,得出结论认为:1)不同技能水平的儿童在接...动作协调形态的获得与视觉通路的发展有密切关系,而视觉通路的信息加工起始于视觉信息的选择。使用德制头戴式i View X HED4眼动仪对不同运动水平的儿童乒乓球选手在接发球时的视觉焦点加以考察,得出结论认为:1)不同技能水平的儿童在接发球时的视觉焦点不同;2)优秀组的主要焦点为球拍,说明球拍的变化是影响选手进行运动预期和运动决策的重要信息;3)一般组和初学组的视觉焦点都集中在球、其它部位的AOI区域上,而较少落到对手球拍区域上,说明其对球的落点判断更依赖于已经发生的事实,而不能有效运用球拍的变化信息做到提前预测。展开更多
视觉控制能力对于运动学习的重要意义正如其对于课业学习一样,是认知活动的首要关卡。儿童软式垒球的教学与研究在我国方兴未艾。为探究眼动特征与运动学习的关系,使用德制i View X HED4头戴式眼动仪,测量15名有过棒球训练的儿童与15名...视觉控制能力对于运动学习的重要意义正如其对于课业学习一样,是认知活动的首要关卡。儿童软式垒球的教学与研究在我国方兴未艾。为探究眼动特征与运动学习的关系,使用德制i View X HED4头戴式眼动仪,测量15名有过棒球训练的儿童与15名从未接受过棒球训练的儿童,在击球前0.167 s、0.1 s以及击中球体时的视觉落点偏移值,分析视觉落点偏移值与击球成功率的关系,比较有无棒球训练经验对儿童的视觉落点偏移值的影响,以及击球成功率不同的儿童的视觉落点偏移值差异。结论:(1)无论有无棒球训练经验,视觉落点偏移值均与击球成功率呈现显著负相关(P<0.01);(2)棒球组儿童的视觉落点偏移值显著小于一般组(P<0.05);(3)击球成功率为100%的儿童,存在明显不同于其他儿童的眼动特异性,视觉控制能力显著优于其他儿童(P<0.01)。展开更多
The present paper covers a new process for the synthesis of 1-（2,6,6-trimethyl-1-cyclohexenyl）-3-methyl-2-buten-4-al with dimethyl sulfide, bromomethane and β-ionone as primary materials in four steps, via the carb...The present paper covers a new process for the synthesis of 1-（2,6,6-trimethyl-1-cyclohexenyl）-3-methyl-2-buten-4-al with dimethyl sulfide, bromomethane and β-ionone as primary materials in four steps, via the carbine reaction of dimethyl sulfide and bromomethane, the cyclization of trimethylsulfonium bromide and β-ionone, the opening of epoxy compound and isomerization of C14-aldehyde. The overall yield is 77%. The structure of the titled product was characterized by GC/MS, IR and 1H NMR. The process has many advantages such as facile low-cost materials, high conversion, short reaction time, mild reaction ondition, and less by-products. Furthermore, the part materials can be recycled, the cost and pollution are reduced, so it is feasible for industry production.展开更多
文摘动作协调形态的获得与视觉通路的发展有密切关系,而视觉通路的信息加工起始于视觉信息的选择。使用德制头戴式i View X HED4眼动仪对不同运动水平的儿童乒乓球选手在接发球时的视觉焦点加以考察,得出结论认为:1)不同技能水平的儿童在接发球时的视觉焦点不同;2)优秀组的主要焦点为球拍,说明球拍的变化是影响选手进行运动预期和运动决策的重要信息;3)一般组和初学组的视觉焦点都集中在球、其它部位的AOI区域上,而较少落到对手球拍区域上,说明其对球的落点判断更依赖于已经发生的事实,而不能有效运用球拍的变化信息做到提前预测。
文摘The present paper covers a new process for the synthesis of 1-（2,6,6-trimethyl-1-cyclohexenyl）-3-methyl-2-buten-4-al with dimethyl sulfide, bromomethane and β-ionone as primary materials in four steps, via the carbine reaction of dimethyl sulfide and bromomethane, the cyclization of trimethylsulfonium bromide and β-ionone, the opening of epoxy compound and isomerization of C14-aldehyde. The overall yield is 77%. The structure of the titled product was characterized by GC/MS, IR and 1H NMR. The process has many advantages such as facile low-cost materials, high conversion, short reaction time, mild reaction ondition, and less by-products. Furthermore, the part materials can be recycled, the cost and pollution are reduced, so it is feasible for industry production.
