The haptic perception affords detection of the physical and functional properties of an instrument actively sustained.Fifty-seven children(8.82±0.38 years old)and 64 elderlies(71.3±4.46 years old)estimated t...The haptic perception affords detection of the physical and functional properties of an instrument actively sustained.Fifty-seven children(8.82±0.38 years old)and 64 elderlies(71.3±4.46 years old)estimated the length and the distance of the center of percussion for two table tennis rackets and a badminton racket.The eigenvalues of each racket for length and distance from the wrist to the center of percussion were calculated.The present study confirmed the results obtained with field tennis rackets,extending them to table tennis and badminton rackets,and also to children.The elderlies preserved and children had the capacity of haptically detect physical and functional properties of table tennis and badminton rackets.The weight of the rackets affected properties estimations.The eigenvalues may be a valid tool for the definition of physical and functional properties of sport instruments,allowing better adjustment to different motor development stages.展开更多
With the continues improving of people＇s living standards, more and more people work out in all kinds of sports fields beyond the busy work. On the other hand, the development of the modem competitive sports also req...With the continues improving of people＇s living standards, more and more people work out in all kinds of sports fields beyond the busy work. On the other hand, the development of the modem competitive sports also requires that the sports experts should not only strive for the scientific training, but should also pay much attention on the improvement and development of the sports equipment at the same time, which makes the sports equipment market have achieved unprecedented prosperity. This paper introduces the application of the fiber reinforced composite materials in the field of sports equipment, which is described mainly from the advantages of the fiber reinforced composite materials used in sports equipment areas, and from the aspects of the principles of material selection, the product varieties, the application examples and the status.展开更多
Aqueous zinc-iodine(Zn-I_(2))batteries show great potential as energy storage candidates due to their high-safety and low-cost,but confronts hydrogen evolution reaction(HER)and dendrite growth at anode side and polyio...Aqueous zinc-iodine(Zn-I_(2))batteries show great potential as energy storage candidates due to their high-safety and low-cost,but confronts hydrogen evolution reaction(HER)and dendrite growth at anode side and polyiodide shuttling at cathode side.Herein,"tennis racket"(TR)hydrogel electrolytes were prepared by the co-polymerization and co-blending of polyacrylamide(PAM),sodium lignosulfonate(SL),and sodium alginate(SA)to synchronously regulate cathode and anode of Zn-I_(2)batteries."Gridline structure"of TR can induce the uniform transportation of Zn^(2+)ions through the coordination effect to hinder HER and dendrite growth at anode side,as well as hit I_(3)^(-)ions as"tennis"via the strong repulsion force to avoid shuttle effect at cathode side.The synergistic effect of TR electrolyte endows Zn-Zn symmetric battery with high cycling stability over 4500 h and Zn-I_(2)cell with the stably cycling life of 15000 cycles at5 A g^(-1),outperforming the reported works.The practicability of TR electrolyte is verified by flexible Zn-I_(2)pouch battery.This work opens a route to synchronously regulate cathode and anode to enhance the electrochemical performance of Zn-I_(2)batteries.展开更多
文摘The haptic perception affords detection of the physical and functional properties of an instrument actively sustained.Fifty-seven children(8.82±0.38 years old)and 64 elderlies(71.3±4.46 years old)estimated the length and the distance of the center of percussion for two table tennis rackets and a badminton racket.The eigenvalues of each racket for length and distance from the wrist to the center of percussion were calculated.The present study confirmed the results obtained with field tennis rackets,extending them to table tennis and badminton rackets,and also to children.The elderlies preserved and children had the capacity of haptically detect physical and functional properties of table tennis and badminton rackets.The weight of the rackets affected properties estimations.The eigenvalues may be a valid tool for the definition of physical and functional properties of sport instruments,allowing better adjustment to different motor development stages.
文摘With the continues improving of people＇s living standards, more and more people work out in all kinds of sports fields beyond the busy work. On the other hand, the development of the modem competitive sports also requires that the sports experts should not only strive for the scientific training, but should also pay much attention on the improvement and development of the sports equipment at the same time, which makes the sports equipment market have achieved unprecedented prosperity. This paper introduces the application of the fiber reinforced composite materials in the field of sports equipment, which is described mainly from the advantages of the fiber reinforced composite materials used in sports equipment areas, and from the aspects of the principles of material selection, the product varieties, the application examples and the status.
基金financially supported by the Energy Revolution S&T Program of Yulin Innovation Institute of Clean Energy(E411060316)the NSFC-CONICFT Joint Project(51961125207)+1 种基金the Special Fund(2024)of Basic Scientific Research Project at Undergraduate University in Liaoning Province(LJ212410152056)the Foundation(GZKF202301)of State Key Laboratory of Biobased Material and Green Papermaking,Qilu University of Technology,Shandong Academy of Sciences。
文摘Aqueous zinc-iodine(Zn-I_(2))batteries show great potential as energy storage candidates due to their high-safety and low-cost,but confronts hydrogen evolution reaction(HER)and dendrite growth at anode side and polyiodide shuttling at cathode side.Herein,"tennis racket"(TR)hydrogel electrolytes were prepared by the co-polymerization and co-blending of polyacrylamide(PAM),sodium lignosulfonate(SL),and sodium alginate(SA)to synchronously regulate cathode and anode of Zn-I_(2)batteries."Gridline structure"of TR can induce the uniform transportation of Zn^(2+)ions through the coordination effect to hinder HER and dendrite growth at anode side,as well as hit I_(3)^(-)ions as"tennis"via the strong repulsion force to avoid shuttle effect at cathode side.The synergistic effect of TR electrolyte endows Zn-Zn symmetric battery with high cycling stability over 4500 h and Zn-I_(2)cell with the stably cycling life of 15000 cycles at5 A g^(-1),outperforming the reported works.The practicability of TR electrolyte is verified by flexible Zn-I_(2)pouch battery.This work opens a route to synchronously regulate cathode and anode to enhance the electrochemical performance of Zn-I_(2)batteries.
