AIM: To investigate and evaluate healing patterns around flaps made with different side-cut angulations after femtosecond laser in situ keratomileusis(FS-LASIK).METHODS: Thirty-four patients(68 eyes) received a 90...AIM: To investigate and evaluate healing patterns around flaps made with different side-cut angulations after femtosecond laser in situ keratomileusis(FS-LASIK).METHODS: Thirty-four patients(68 eyes) received a 90° side-cut(n=34) or a 120° side-cut flaps(n=34) made with a femtosecond laser. One day, 1 wk, 1 and 3 mo postoperatively, side-cut scar was evaluated under slit-lamp photography according to a new grading system(Grade 0=transparent scar, 1=faint healing opacity, and 2=evident healing opacity). In vivo corneal confocal microscopy and anterior segment optical coherence tomography(AS-OCT) were used to observe wound-healing patterns around flap margin in the two groups. Sirius Scheimpflug Analyzer was also used to analyze higher order aberrations 3 mo after surgery.RESULTS: There were no significant differences in flap wound-healing patterns at each follow up between the two groups(P>0.05). Three months after surgery, the flap edge scar classified as Grade 0 had excellent apposition and rapid nerve regeneration. At 3 mm and 5 mm pupil diameters, there were significant differences in trefoil aberrations between the two groups(P<0.05), but no statistically significant differences were found in total higher order aberrations(HOAs), spherical aberrations or coma in any of the pupil size conditions(P>0.05).CONCLUSION: Flap edge scars classified as Grade 0 have excellent apposition and rapid nerve regeneration, and 120° side-cut angle flaps induce less trefoil aberrations after FS-LASIK.展开更多
A novel pneumatic recovery method was proposed to curb the problem of high losses caused by side-cutting in a rapeseed combine harvester header.The influence of recovery method and material status changes on the recov...A novel pneumatic recovery method was proposed to curb the problem of high losses caused by side-cutting in a rapeseed combine harvester header.The influence of recovery method and material status changes on the recovery effect was studied via the CFD-DEM(computational fluid dynamic-discrete element method)coupling simulation.The effect of airflow action on the recovery effect was compared and analyzed,and the composite pneumatic recovery method was determined.In addition,the influence of material status changes and material feeding rate on the recovery effect was explored,and the critical condition of material blockage in the recovery device was configured.As such,the relationship model between air velocity and recovery rate was constructed and the air distribution ratio of the flow field in the device under this condition was optimized,had verified the rationality of this pneumatic recovery method was verified by a series of field tests.The average rapeseed recovery rate of 92.95%was achieved with the application of the recovery device,and the total loss rate of the header reduced by 52.26%,which is of great significance in reducing the total loss rate of the combine harvesters and improving the operation performance of machinery.The research results can provide a reference for the design of the header structure of a rape combine harvester.展开更多
目的:探讨篮球运动员在接球任务介入后完成侧切和急停起跳动作时,对下肢运动学、肌电学特征的影响,为优化接球任务的运动策略以及预防损伤提供理论支持。方法:运用两台JVC相机以及无线表面肌电系统采集18名男子篮球专项大学生在不同接...目的:探讨篮球运动员在接球任务介入后完成侧切和急停起跳动作时,对下肢运动学、肌电学特征的影响,为优化接球任务的运动策略以及预防损伤提供理论支持。方法:运用两台JVC相机以及无线表面肌电系统采集18名男子篮球专项大学生在不同接球任务后完成侧切与急停起跳动作时的下肢运动学、肌电学特征。采用2×2重复设计的双因素方差分析检验不同接球任务和不同动作对下肢运动学、肌电学参数的影响。结果:(1)着地时刻,与无任务相比,接球任务介入后,运动员侧切时重心移动速度(P<0.001)、躯干前倾角(P=0.018)、髋关节外展角(P=0.002)减小;急停起跳在重心移动速度(P<0.001)、躯干前倾角(P=0.001)、髋关节内收角(P<0.001)、踝关节背屈角(P=0.015)小于侧切动作,髋关节屈曲角(P=0.014)、髋关节内旋/外旋角(P<0.001)、膝关节屈曲角(P=0.019)大于侧切动作。(2)在缓冲阶段,与无任务相比,接球任务介入后,运动员躯干前倾角活动度(Range of Motion,ROM)(P<0.05)、髋关节额状面ROM(P<0.05)、膝关节矢状面(P<0.05)、踝关节矢状面ROM(P<0.05)增大,且在侧切中髋关节水平面ROM(P=0.028)增大;急停起跳在踝关节矢状面ROM(P<0.05)相比于侧切减小。(3)在肌电学方面,接球任务介入后,腓肠肌内侧头均方根振幅(P=0.017)、股内侧肌均方根振幅(P=0.017)相比于无任务减小;接球任务介入后,急停起跳动作的腓肠肌内侧头均方根振幅(P=0.017)相比侧切减小。结论:篮球运动员在完成接球任务后的侧切动作时会主动减速,同时导致躯干前倾角减小,髋关节外展角增大,可能会使运动员产生异常的运动模式。在缓冲阶段,运动员在接球任务介入后膝关节和踝关节屈曲角ROM增加,可能掩盖肌肉控制不足或关节稳定性缺陷。需通过拉伸与灵活性训练恢复肌肉弹性、优化神经肌肉控制,从而提高运动员面对复杂情境下完成不同动作姿势控制的能力。展开更多
基金Supported by the Science and Technology Program of Xi’an,China No.201805097YX5SF31(2)the Foundation of Shaanxi Province Key Research and Development Project (No.2018SF-216)。
文摘AIM: To investigate and evaluate healing patterns around flaps made with different side-cut angulations after femtosecond laser in situ keratomileusis(FS-LASIK).METHODS: Thirty-four patients(68 eyes) received a 90° side-cut(n=34) or a 120° side-cut flaps(n=34) made with a femtosecond laser. One day, 1 wk, 1 and 3 mo postoperatively, side-cut scar was evaluated under slit-lamp photography according to a new grading system(Grade 0=transparent scar, 1=faint healing opacity, and 2=evident healing opacity). In vivo corneal confocal microscopy and anterior segment optical coherence tomography(AS-OCT) were used to observe wound-healing patterns around flap margin in the two groups. Sirius Scheimpflug Analyzer was also used to analyze higher order aberrations 3 mo after surgery.RESULTS: There were no significant differences in flap wound-healing patterns at each follow up between the two groups(P>0.05). Three months after surgery, the flap edge scar classified as Grade 0 had excellent apposition and rapid nerve regeneration. At 3 mm and 5 mm pupil diameters, there were significant differences in trefoil aberrations between the two groups(P<0.05), but no statistically significant differences were found in total higher order aberrations(HOAs), spherical aberrations or coma in any of the pupil size conditions(P>0.05).CONCLUSION: Flap edge scars classified as Grade 0 have excellent apposition and rapid nerve regeneration, and 120° side-cut angle flaps induce less trefoil aberrations after FS-LASIK.
基金This work was supported by the Key Research Program&Technology Innovation Program of Chinese Academy of Agricultural Sciences(CAAS-ZDRW202105)China Agriculture Research System of MOF and MARA(CARS-12)+1 种基金Synergistic Innovation Center of Jiangsu Modern Agricultural Equipment and Technology(4091600002)Central Public-interest Scientific Institution Basal Research Fund for Chinese Academy of Tropical Agricultural Sciences(S202102-02).
文摘A novel pneumatic recovery method was proposed to curb the problem of high losses caused by side-cutting in a rapeseed combine harvester header.The influence of recovery method and material status changes on the recovery effect was studied via the CFD-DEM(computational fluid dynamic-discrete element method)coupling simulation.The effect of airflow action on the recovery effect was compared and analyzed,and the composite pneumatic recovery method was determined.In addition,the influence of material status changes and material feeding rate on the recovery effect was explored,and the critical condition of material blockage in the recovery device was configured.As such,the relationship model between air velocity and recovery rate was constructed and the air distribution ratio of the flow field in the device under this condition was optimized,had verified the rationality of this pneumatic recovery method was verified by a series of field tests.The average rapeseed recovery rate of 92.95%was achieved with the application of the recovery device,and the total loss rate of the header reduced by 52.26%,which is of great significance in reducing the total loss rate of the combine harvesters and improving the operation performance of machinery.The research results can provide a reference for the design of the header structure of a rape combine harvester.
文摘目的:探讨篮球运动员在接球任务介入后完成侧切和急停起跳动作时,对下肢运动学、肌电学特征的影响,为优化接球任务的运动策略以及预防损伤提供理论支持。方法:运用两台JVC相机以及无线表面肌电系统采集18名男子篮球专项大学生在不同接球任务后完成侧切与急停起跳动作时的下肢运动学、肌电学特征。采用2×2重复设计的双因素方差分析检验不同接球任务和不同动作对下肢运动学、肌电学参数的影响。结果:(1)着地时刻,与无任务相比,接球任务介入后,运动员侧切时重心移动速度(P<0.001)、躯干前倾角(P=0.018)、髋关节外展角(P=0.002)减小;急停起跳在重心移动速度(P<0.001)、躯干前倾角(P=0.001)、髋关节内收角(P<0.001)、踝关节背屈角(P=0.015)小于侧切动作,髋关节屈曲角(P=0.014)、髋关节内旋/外旋角(P<0.001)、膝关节屈曲角(P=0.019)大于侧切动作。(2)在缓冲阶段,与无任务相比,接球任务介入后,运动员躯干前倾角活动度(Range of Motion,ROM)(P<0.05)、髋关节额状面ROM(P<0.05)、膝关节矢状面(P<0.05)、踝关节矢状面ROM(P<0.05)增大,且在侧切中髋关节水平面ROM(P=0.028)增大;急停起跳在踝关节矢状面ROM(P<0.05)相比于侧切减小。(3)在肌电学方面,接球任务介入后,腓肠肌内侧头均方根振幅(P=0.017)、股内侧肌均方根振幅(P=0.017)相比于无任务减小;接球任务介入后,急停起跳动作的腓肠肌内侧头均方根振幅(P=0.017)相比侧切减小。结论:篮球运动员在完成接球任务后的侧切动作时会主动减速,同时导致躯干前倾角减小,髋关节外展角增大,可能会使运动员产生异常的运动模式。在缓冲阶段,运动员在接球任务介入后膝关节和踝关节屈曲角ROM增加,可能掩盖肌肉控制不足或关节稳定性缺陷。需通过拉伸与灵活性训练恢复肌肉弹性、优化神经肌肉控制,从而提高运动员面对复杂情境下完成不同动作姿势控制的能力。
