In this study, two types of pre-distributors (nonuniform-pores and dual-baffle)for the combined solids-liquid distributor in gas-liquid-solid circulating fluidized bed heat exchanger, were designed and the characteris...In this study, two types of pre-distributors (nonuniform-pores and dual-baffle)for the combined solids-liquid distributor in gas-liquid-solid circulating fluidized bed heat exchanger, were designed and the characteristics of particles distribution was compared. In the experiments, the sampling method was used to measure local solids flux and a U shape pipe was used to measure static pressure drop in the lower pipe box.The effects of different superficial liquid velocities and liquid viscosities on the parameters mentioned above were investigated.The degree of distribution of local solids flux in exchanger pipe was evaluated by the non-uniformity function.The results showed that the two types of pre-distributors were both suitable for gas-liquid-solid circulating fluidized bed heat exchanger at a lower static pressure drop in the lower pipe box.Compared with the nonuniform-pores pre-distributor, the dual-baffle pre-distributor showed better performance.展开更多
目的探讨意拳训练时接受振动刺激对下肢肌肉及其神经支配的影响。方法 48位健康大学生分为3组:意拳振动组(YQV)、意拳组(YQ)以及控制组(CON),进行为期8周、每周3次的训练。训练前后以Biodex System 4等速训练系统、Biopac多导生理记录仪...目的探讨意拳训练时接受振动刺激对下肢肌肉及其神经支配的影响。方法 48位健康大学生分为3组:意拳振动组(YQV)、意拳组(YQ)以及控制组(CON),进行为期8周、每周3次的训练。训练前后以Biodex System 4等速训练系统、Biopac多导生理记录仪及AMTI三维测力台,测试下肢最大等长肌力、等速肌力、肌电反应及静态平衡。统计分析以双因素方差分析进行。结果意拳组的60°/s等速向心肌力显著进步11.8%(P<0.05);静态平衡时,足底压力中心移动面积显著减少15.3%(P<0.05),并明显少于控制组(P<0.05);意拳组在静态平衡的进步率(9.3%)显著优于控制组(P<0.05),其余测试项则无差异;控制组在各因变量中无显著变化。结论意拳结合振动刺激进行训练能有效增进膝伸肌等速肌力与下肢静态平衡的表现,可作为促进下肢肌肉及神经支配表现的新式训练方法。展开更多
目的比较散打与拳击运动员后手直拳击打效果、双下肢发力指标和CMJ(counter movement jump)指标的差异,为跨项选材和转项后的衔接训练提供参考。方法采用Vicon3D红外动作捕捉系统、Kistler测力台和测力靶以及同步设备对拳击组(n=11)与...目的比较散打与拳击运动员后手直拳击打效果、双下肢发力指标和CMJ(counter movement jump)指标的差异,为跨项选材和转项后的衔接训练提供参考。方法采用Vicon3D红外动作捕捉系统、Kistler测力台和测力靶以及同步设备对拳击组(n=11)与散打组(n=16)运动员后手直拳技术进行比较。选取拳速指标(3个)、测力靶指标(6个)、双下肢发力指标(5个)和CMJ指标(7个)进行分析。结果拳击组运动员接触拳速和速度衰减率指标与散打组差异显著(P<0.001)。拳击组优秀运动员峰值拳速可达9.301 m·s^(-1),并表现出较高的接触拳速(7.778 m·s^(-1))。测力靶数据6个指标中有4个在2组间差异显著(P<0.001),拳击组运动员双下肢的后腿发力各项指标均与散打组差异显著(P<0.050),CMJ各项指标则在2组间差异不显著(P>0.050)。结论拳击组运动员击打效果优于散打组,双下肢发力指标中的后腿积极发力指标也高于散打组,2组下肢爆发力测试结果相当。如面临转项,散打运动员应弥补技术因素的不足,提升出拳速度、有效击打质量及后腿积极发力能力。展开更多
文摘In this study, two types of pre-distributors (nonuniform-pores and dual-baffle)for the combined solids-liquid distributor in gas-liquid-solid circulating fluidized bed heat exchanger, were designed and the characteristics of particles distribution was compared. In the experiments, the sampling method was used to measure local solids flux and a U shape pipe was used to measure static pressure drop in the lower pipe box.The effects of different superficial liquid velocities and liquid viscosities on the parameters mentioned above were investigated.The degree of distribution of local solids flux in exchanger pipe was evaluated by the non-uniformity function.The results showed that the two types of pre-distributors were both suitable for gas-liquid-solid circulating fluidized bed heat exchanger at a lower static pressure drop in the lower pipe box.Compared with the nonuniform-pores pre-distributor, the dual-baffle pre-distributor showed better performance.
文摘目的探讨意拳训练时接受振动刺激对下肢肌肉及其神经支配的影响。方法 48位健康大学生分为3组:意拳振动组(YQV)、意拳组(YQ)以及控制组(CON),进行为期8周、每周3次的训练。训练前后以Biodex System 4等速训练系统、Biopac多导生理记录仪及AMTI三维测力台,测试下肢最大等长肌力、等速肌力、肌电反应及静态平衡。统计分析以双因素方差分析进行。结果意拳组的60°/s等速向心肌力显著进步11.8%(P<0.05);静态平衡时,足底压力中心移动面积显著减少15.3%(P<0.05),并明显少于控制组(P<0.05);意拳组在静态平衡的进步率(9.3%)显著优于控制组(P<0.05),其余测试项则无差异;控制组在各因变量中无显著变化。结论意拳结合振动刺激进行训练能有效增进膝伸肌等速肌力与下肢静态平衡的表现,可作为促进下肢肌肉及神经支配表现的新式训练方法。
文摘目的比较散打与拳击运动员后手直拳击打效果、双下肢发力指标和CMJ(counter movement jump)指标的差异,为跨项选材和转项后的衔接训练提供参考。方法采用Vicon3D红外动作捕捉系统、Kistler测力台和测力靶以及同步设备对拳击组(n=11)与散打组(n=16)运动员后手直拳技术进行比较。选取拳速指标(3个)、测力靶指标(6个)、双下肢发力指标(5个)和CMJ指标(7个)进行分析。结果拳击组运动员接触拳速和速度衰减率指标与散打组差异显著(P<0.001)。拳击组优秀运动员峰值拳速可达9.301 m·s^(-1),并表现出较高的接触拳速(7.778 m·s^(-1))。测力靶数据6个指标中有4个在2组间差异显著(P<0.001),拳击组运动员双下肢的后腿发力各项指标均与散打组差异显著(P<0.050),CMJ各项指标则在2组间差异不显著(P>0.050)。结论拳击组运动员击打效果优于散打组,双下肢发力指标中的后腿积极发力指标也高于散打组,2组下肢爆发力测试结果相当。如面临转项,散打运动员应弥补技术因素的不足,提升出拳速度、有效击打质量及后腿积极发力能力。
