Objectives:To examine the effects of 16-week Tai Chi(TC) training on postural stability and associated physiological factors in older subjects,forty elderly individuals(aged ≥ 60 years) living in the community were r...Objectives:To examine the effects of 16-week Tai Chi(TC) training on postural stability and associated physiological factors in older subjects,forty elderly individuals(aged ≥ 60 years) living in the community were randomly placed into either the TC intervention group(n=22) or the control group(n=18).The former underwent a supervised TC exercise program for 16 weeks,while the latter received general education for a comparable time period.Measurements:Postural stability was assessed by timed stance tests in single-leg stance with the eyes open(SLO) or closed(SLC),and tandem stance with the eyes closed(TSC).Proprioceptive function was evaluated by measuring ankle and knee kinesthesia.The maximum concentric strength of the knee flexors and extensors,ankle plantarflexors and dorsiflexors was measured by isokinetic dynamometer.Moreover,the reaction time of different muscles in the lower extremity was also examined by measuring the onset latency of the muscles to perturbations on the ankle joint using an electromyography system.Results:After the 16-week TC intervention,significant TC training effects were gained on knee kinesthesia,knee flexor strength,latency of semitendinous muscle,and postural stability in SLO.For the other measures,no significant training effects were found.Conclusions:The 16-week TC intervention was found to be beneficial for the improvement of postural stability and associated physiological factors.However,there are discrepancies in TC training effects on different factors in the sensorimotor system.展开更多
目的:使用三维运动分析系统观察不同严重程度的膝骨关节炎(Knee Osteoarthritis,KOA)恐动症(低KOA恐动症、高KOA恐动症)患者与年龄匹配的无KOA症状人群在登梯过程中姿势稳定性和下肢关节角度的差异。方法:运用三维运动分析系统检测低KO...目的:使用三维运动分析系统观察不同严重程度的膝骨关节炎(Knee Osteoarthritis,KOA)恐动症(低KOA恐动症、高KOA恐动症)患者与年龄匹配的无KOA症状人群在登梯过程中姿势稳定性和下肢关节角度的差异。方法:运用三维运动分析系统检测低KOA恐动症患者、高KOA恐动症患者和无KOA症状人群共78例受试者在登梯过程中的姿势稳定性(Mar‐gin of Stability,MoS)和关节角度等生物力学因素的差异。结果:低、高KOA恐动症患者在登梯过程中在矢状面和冠状面MoS较差,上梯时髋屈曲和内收最大角度及膝屈伸活动范围均增加;低KOA恐动症患者踝背屈和膝屈曲最大角度均减小;低KOA恐动症患者膝屈曲最大角度低于高KOA恐动症患者。下梯时,低、高KOA恐动症患者髋屈曲最大角度增加,低KOA恐动症患者踝内外翻活动范围增加,高KOA恐动症患者髋内收最大角度增加。结论:低、高KOA恐动症患者在登梯时矢状面和冠状面稳定性较差,但未发现恐动症对KOA患者的显著影响。展开更多
Organometallic halide perovskite materials make great achievements in optoelectronic fields,especially in solar cells,in which the organic cations contain amine components.However,the amine with NàH bonds is easi...Organometallic halide perovskite materials make great achievements in optoelectronic fields,especially in solar cells,in which the organic cations contain amine components.However,the amine with NàH bonds is easily hydrolyzed with moisture in the air,weakening the perovskite materials stability.It is desirable to develop other non-amine stable perovskite materials.In this work,sulfur-based perovskite-like(CH_(3))_(3)SPbI_(3) nanorod arrays were fabricated by a solution-processed method,which can be indexed hexagonal crystal structure in the space group P63 mc.The binding force is exceptionally strong between the non-amine(CH_(3))_(3) S+and[PbI_(6)]_(4)-octahedral,leading to high stability of(CH_(3))_(3)SPbI_(3).The(CH_(3))_(3)SPbI_(3) nanorod arrays can keep the morphology and crystal structure in an ambient atmosphere over 60 days.In addition,the(CH_(3))_(3)SPbI_(3) nanorod arrays can offer direct charge transfer channels,which show excellent optoelectronic properties.The(CH_(3))_(3)SPbI_(3) nanorod arrays-based solar cells with VOx hole transfer layers achieved a power conversion efficiency of 2.07%with negligible hysteresis.And the(CH_(3))_(3)SPbI_(3) nanorod arrays were also effectively applied in photodetectors with interdigitated gold electrodes.This work demonstrates that sulfur-based perovskite-like(CH_(3))_(3)SPbI_(3) is a novel promising stable compound with great potential for practical optoelectronic applications.展开更多
Background:In the military,insufficient postural stability is a risk factor for developing lower extremity injuries.Postural stability training programs are effective in preventing these injuries.However,an objective ...Background:In the military,insufficient postural stability is a risk factor for developing lower extremity injuries.Postural stability training programs are effective in preventing these injuries.However,an objective method for the measurement of postural stability in servicemen is lacking.The primary objective of this study was to assess the influence of the number of repetitions,different foot positions and real-time visual feedback on postural stability,as well as their effects on the intrasession reliability of postural stability measurements in servicemen.The secondary objective was to assess the concurrent validity of the measurements.Methods:Twenty healthy servicemen between 20 and 50 years of age and in active duty were eligible for this quantitative,cross-sectional study.The measurements took place on a force plate,measuring the mean velocity of the center of pressure.The participants were asked to stand as still as possible in three different foot positions(wide stance,small stance,and on one leg),five times each for 45 s each time,and the measurements were performed with and without real-time visual feedback.Results:We observed a significant main effect of foot position(P<0.001),but not of visual feedback(P=0.119)or repetition number(P=0.915).Postural stability decreased in the more challenging foot positions.The ICC estimates varied from 0.809(one repetition in wide stance)to 0.985(five repetitions on one leg).The common variance(R2)between different foot positions without feedback varied between 0.008(wide stance)and 0.412.Conclusions:To yield reliable data,wide-stance measurements should be conducted three times,and small-stance measurements and measurements on one leg should be conducted two times.The scores of a measurement in a particular foot position cannot predict the scores of measurements in other foot positions.展开更多
First principles study is reported for the band structures, site and angular momentum decomposed density of states. and the electronic charge density distributions in high-temperature structural materials D88-Ti5Si3 w...First principles study is reported for the band structures, site and angular momentum decomposed density of states. and the electronic charge density distributions in high-temperature structural materials D88-Ti5Si3 with the addition of low-rate metalloid: carbon, boron, nitrogen and oxygen. It shows that how the addition of metalloid atoms can stabilize Nowotny phase of Ti,Si3 from the viewpoint of the electron structure.展开更多
文摘目的:探讨动态神经肌肉稳定技术(Dynamic Neuromuscular Stabilization,DNS)下的核心稳定训练结合局部针刺运动方案对脑卒中后偏瘫患者步行及姿势控制能力的影响。方法:选取2022年3月~2022年9月在郴州市第一人民医院就诊的脑卒中患者90例,按随机数字表分为对照组(n=45)和观察组(n=45),对照组采用常规康复训练,观察组在此基础上增加DNS核心稳定训练结合局部针刺运动疗法。治疗8周后,对比并分析治疗前后两组患者步态时空参数中步长、步速、步频参数;步态时相参数中双支撑相占步态周期百分比、患侧单支撑相占步态周期百分比、步行周期参数;脑卒中患者姿势控制量表(Posture assessment of stoke scale,PASS)量表、Tinnetti(Performance-Oriented Assessment of Mobility)量表及Fugl-Meyer下肢运动功能(FMA-LE)量表评分数据。结果:治疗后,两组步长、步速、步频参数、双支撑相占步态周期百分比、患侧单支撑相占步态周期百分比、Tinnetti评分、PASS评分及FMA评分均显著高于治疗前(P<0.05),步行周期显著低于治疗前(P<0.05),且观察组治疗后步长、步速、步频参数、双支撑相占步态周期百分比、患侧单支撑相占步态周期百分比、PASS评分、Tinnetti评分及FMALE评分均显著高于对照组(P<0.05),步行周期则低于对照组(P<0.05)。结论:DNS核心稳定训练结合局部针刺运动可提高脑卒中后偏瘫患者核心稳定及姿势控制能力,改善步行功能。
文摘Objectives:To examine the effects of 16-week Tai Chi(TC) training on postural stability and associated physiological factors in older subjects,forty elderly individuals(aged ≥ 60 years) living in the community were randomly placed into either the TC intervention group(n=22) or the control group(n=18).The former underwent a supervised TC exercise program for 16 weeks,while the latter received general education for a comparable time period.Measurements:Postural stability was assessed by timed stance tests in single-leg stance with the eyes open(SLO) or closed(SLC),and tandem stance with the eyes closed(TSC).Proprioceptive function was evaluated by measuring ankle and knee kinesthesia.The maximum concentric strength of the knee flexors and extensors,ankle plantarflexors and dorsiflexors was measured by isokinetic dynamometer.Moreover,the reaction time of different muscles in the lower extremity was also examined by measuring the onset latency of the muscles to perturbations on the ankle joint using an electromyography system.Results:After the 16-week TC intervention,significant TC training effects were gained on knee kinesthesia,knee flexor strength,latency of semitendinous muscle,and postural stability in SLO.For the other measures,no significant training effects were found.Conclusions:The 16-week TC intervention was found to be beneficial for the improvement of postural stability and associated physiological factors.However,there are discrepancies in TC training effects on different factors in the sensorimotor system.
文摘目的:使用三维运动分析系统观察不同严重程度的膝骨关节炎(Knee Osteoarthritis,KOA)恐动症(低KOA恐动症、高KOA恐动症)患者与年龄匹配的无KOA症状人群在登梯过程中姿势稳定性和下肢关节角度的差异。方法:运用三维运动分析系统检测低KOA恐动症患者、高KOA恐动症患者和无KOA症状人群共78例受试者在登梯过程中的姿势稳定性(Mar‐gin of Stability,MoS)和关节角度等生物力学因素的差异。结果:低、高KOA恐动症患者在登梯过程中在矢状面和冠状面MoS较差,上梯时髋屈曲和内收最大角度及膝屈伸活动范围均增加;低KOA恐动症患者踝背屈和膝屈曲最大角度均减小;低KOA恐动症患者膝屈曲最大角度低于高KOA恐动症患者。下梯时,低、高KOA恐动症患者髋屈曲最大角度增加,低KOA恐动症患者踝内外翻活动范围增加,高KOA恐动症患者髋内收最大角度增加。结论:低、高KOA恐动症患者在登梯时矢状面和冠状面稳定性较差,但未发现恐动症对KOA患者的显著影响。
基金the financial support from the National Natural Science Foundation of China(U1732126,11804166,51602161,51372119)the Natural Science Foundation of Jiangsu Province(BK20150860)the Postgraduate Research&Practice Innovation Program of Jiangsu Province(KYCX180846,KYCX180869)。
文摘Organometallic halide perovskite materials make great achievements in optoelectronic fields,especially in solar cells,in which the organic cations contain amine components.However,the amine with NàH bonds is easily hydrolyzed with moisture in the air,weakening the perovskite materials stability.It is desirable to develop other non-amine stable perovskite materials.In this work,sulfur-based perovskite-like(CH_(3))_(3)SPbI_(3) nanorod arrays were fabricated by a solution-processed method,which can be indexed hexagonal crystal structure in the space group P63 mc.The binding force is exceptionally strong between the non-amine(CH_(3))_(3) S+and[PbI_(6)]_(4)-octahedral,leading to high stability of(CH_(3))_(3)SPbI_(3).The(CH_(3))_(3)SPbI_(3) nanorod arrays can keep the morphology and crystal structure in an ambient atmosphere over 60 days.In addition,the(CH_(3))_(3)SPbI_(3) nanorod arrays can offer direct charge transfer channels,which show excellent optoelectronic properties.The(CH_(3))_(3)SPbI_(3) nanorod arrays-based solar cells with VOx hole transfer layers achieved a power conversion efficiency of 2.07%with negligible hysteresis.And the(CH_(3))_(3)SPbI_(3) nanorod arrays were also effectively applied in photodetectors with interdigitated gold electrodes.This work demonstrates that sulfur-based perovskite-like(CH_(3))_(3)SPbI_(3) is a novel promising stable compound with great potential for practical optoelectronic applications.
基金funded by the Military Rehabilitation Center Aardenburgpart of the Dutch Ministry of Defense。
文摘Background:In the military,insufficient postural stability is a risk factor for developing lower extremity injuries.Postural stability training programs are effective in preventing these injuries.However,an objective method for the measurement of postural stability in servicemen is lacking.The primary objective of this study was to assess the influence of the number of repetitions,different foot positions and real-time visual feedback on postural stability,as well as their effects on the intrasession reliability of postural stability measurements in servicemen.The secondary objective was to assess the concurrent validity of the measurements.Methods:Twenty healthy servicemen between 20 and 50 years of age and in active duty were eligible for this quantitative,cross-sectional study.The measurements took place on a force plate,measuring the mean velocity of the center of pressure.The participants were asked to stand as still as possible in three different foot positions(wide stance,small stance,and on one leg),five times each for 45 s each time,and the measurements were performed with and without real-time visual feedback.Results:We observed a significant main effect of foot position(P<0.001),but not of visual feedback(P=0.119)or repetition number(P=0.915).Postural stability decreased in the more challenging foot positions.The ICC estimates varied from 0.809(one repetition in wide stance)to 0.985(five repetitions on one leg).The common variance(R2)between different foot positions without feedback varied between 0.008(wide stance)and 0.412.Conclusions:To yield reliable data,wide-stance measurements should be conducted three times,and small-stance measurements and measurements on one leg should be conducted two times.The scores of a measurement in a particular foot position cannot predict the scores of measurements in other foot positions.
文摘First principles study is reported for the band structures, site and angular momentum decomposed density of states. and the electronic charge density distributions in high-temperature structural materials D88-Ti5Si3 with the addition of low-rate metalloid: carbon, boron, nitrogen and oxygen. It shows that how the addition of metalloid atoms can stabilize Nowotny phase of Ti,Si3 from the viewpoint of the electron structure.
