目的探究冷效应加压干预对关节镜下肩袖韧带撕裂修复术后上肢功能及关节功能的影响。方法选取2021年2月至2022年2月收治的91例行肩关节镜手术的患者,随机分为观察组(n=46,采用冷效应加压干预)和对照组(n=45,采用常规干预)。观察并记录2...目的探究冷效应加压干预对关节镜下肩袖韧带撕裂修复术后上肢功能及关节功能的影响。方法选取2021年2月至2022年2月收治的91例行肩关节镜手术的患者,随机分为观察组(n=46,采用冷效应加压干预)和对照组(n=45,采用常规干预)。观察并记录2组患者一般资料、肩关节肿胀评分、上肢肌力评分、CMS评分及不良反应。结果2组患者术前肩关节肿胀评分比较差异有统计学意义(P<0.05),组内比较,术后6 h 2组患者肿胀评分较术前显著升高(P<0.05),组间比较,术后6 h、术后24、48 h观察组患者肿胀评分显著低于对照组(P<0.05),2组患者上肢肌力比较差异有统计学意义(P=0.000),2组患者术前肌力比较差异无统计学意义(P>0.05),术后2组患者上肢肌力均较术前显著升高(P<0.05),观察组患者术后6个月上肢肌力显著高于对照组(P<0.05),2组患者CMS评分比较差异有统计学意义(P<0.05),组间比较,观察组患者术后1、3、6个月CMS评分显著高于对照组(P<0.05),组内比较,2组患者术后6个月CMS评分均显著高于2组术前CMS评分(P<0.05)。结论冷效应加压干预能有效减轻关节镜下肩袖韧带撕裂修复术患者术后关节肿胀,改善患者上肢肌力及关节功能,值得临床推广。展开更多
To study the mechanism of ultrasonic vibration assisted forming,the static and vibration assisted compression tests of aluminum 1050 were carried out via a 25 kHz high-frequency ultrasonic vibration device.It is found...To study the mechanism of ultrasonic vibration assisted forming,the static and vibration assisted compression tests of aluminum 1050 were carried out via a 25 kHz high-frequency ultrasonic vibration device.It is found that vibration reduces the flow resistance and improves the surface topography.The force reduction level is proportional to the ultrasonic vibration amplitude.By using numerical simulation of static and vibration assisted compression tests,the deformation characteristics of material were investigated.Throughout the vibration,the friction between the materials and tools reduces.The stress superposition and friction effects are found to be two major reasons for reducing the force.However,the force reduction because of stress superposition and friction effects is still less than the actual force reduction from the tests,which suggests that softening effect may be one of the other reasons to reduce the force.展开更多
Based on piezoresistive effect, the acceleration sensitivity of multi-walled canbon nanotube (MWNT) films was investigated. A three-point bending technique was presented to measure the piezoresistivity, which used a b...Based on piezoresistive effect, the acceleration sensitivity of multi-walled canbon nanotube (MWNT) films was investigated. A three-point bending technique was presented to measure the piezoresistivity, which used a bending stress applied to the samples while making MWNT films wheeling with a rotational machine. The experimental results showed that the fractional increase in resistance increases linearly versus the increase of centripetal acceleration, and there is a linear relationship between the acceleration and the strain. These shed light on using carbon nanotube films as acceleration sensors for many potential applications.展开更多
The superimposed influences of the blade rows in a multistage compressor are important because different matches of upstream and downstream blades can result in significant differences in the stator wake oscillation. ...The superimposed influences of the blade rows in a multistage compressor are important because different matches of upstream and downstream blades can result in significant differences in the stator wake oscillation. Numerical investigation of the axial stator wake oscillation, which is affected upstream by the axial rotor and downstream by the radial rotor, was performed in an axial-radial combined compressor. Many configurations with different blade numbers and locations, which influence axial stator wake oscillation were investigated. When rotors have equal blade numbers, the axial stator wake oscillates periodically versus time within time T(moving blade passing 1/3 revolution). In contrast, stator wake oscillates irregularly within T when rotors have different blade numbers. A model-split subtraction method is presented in order to separate the influences of the individual blade rows on the wake oscillation of the axial stator. Analysis from the rotor-stator configuration showed that the unsteady flow angle fluctuation response is caused by the upstream rotor. For the rotor-stator-rotor configuration, the unsteady flow angle fluctuations are influenced by upand downstream blade rows. With the model-split subtraction method, the upand downstream influences on the flow angle fluctuation could be clearly separated and quantified. Low amplitudes could be observed when the influences from upand downstream moving rows were superimposed with the "positive peaknegative peak" type wave. Clocking investigations were carried out to change the relative superimposed phase of influences from the surrounding blade rows in order to modulate the amplitudes of the axial stator wake oscillation. However, the amplitudes did not reach the maximum when they were superimposed with "positive peak-positive peak" type wave due to the impact of the interaction between the two moving blade rows.展开更多
文摘目的探究冷效应加压干预对关节镜下肩袖韧带撕裂修复术后上肢功能及关节功能的影响。方法选取2021年2月至2022年2月收治的91例行肩关节镜手术的患者,随机分为观察组(n=46,采用冷效应加压干预)和对照组(n=45,采用常规干预)。观察并记录2组患者一般资料、肩关节肿胀评分、上肢肌力评分、CMS评分及不良反应。结果2组患者术前肩关节肿胀评分比较差异有统计学意义(P<0.05),组内比较,术后6 h 2组患者肿胀评分较术前显著升高(P<0.05),组间比较,术后6 h、术后24、48 h观察组患者肿胀评分显著低于对照组(P<0.05),2组患者上肢肌力比较差异有统计学意义(P=0.000),2组患者术前肌力比较差异无统计学意义(P>0.05),术后2组患者上肢肌力均较术前显著升高(P<0.05),观察组患者术后6个月上肢肌力显著高于对照组(P<0.05),2组患者CMS评分比较差异有统计学意义(P<0.05),组间比较,观察组患者术后1、3、6个月CMS评分显著高于对照组(P<0.05),组内比较,2组患者术后6个月CMS评分均显著高于2组术前CMS评分(P<0.05)。结论冷效应加压干预能有效减轻关节镜下肩袖韧带撕裂修复术患者术后关节肿胀,改善患者上肢肌力及关节功能,值得临床推广。
基金Project(51105250)supported by the National Natural Science Foundation of ChinaProject(P2015-13)supported by the State Key Laboratory of Materials Processing and Die&Mould Technology,Huazhong University of Science and Technology,China
文摘To study the mechanism of ultrasonic vibration assisted forming,the static and vibration assisted compression tests of aluminum 1050 were carried out via a 25 kHz high-frequency ultrasonic vibration device.It is found that vibration reduces the flow resistance and improves the surface topography.The force reduction level is proportional to the ultrasonic vibration amplitude.By using numerical simulation of static and vibration assisted compression tests,the deformation characteristics of material were investigated.Throughout the vibration,the friction between the materials and tools reduces.The stress superposition and friction effects are found to be two major reasons for reducing the force.However,the force reduction because of stress superposition and friction effects is still less than the actual force reduction from the tests,which suggests that softening effect may be one of the other reasons to reduce the force.
基金Funded by the National Natural Science Foundation of China (No. 60376032 and No. 90406024) and the Key Teacher Foundation of Chongqing University.
文摘Based on piezoresistive effect, the acceleration sensitivity of multi-walled canbon nanotube (MWNT) films was investigated. A three-point bending technique was presented to measure the piezoresistivity, which used a bending stress applied to the samples while making MWNT films wheeling with a rotational machine. The experimental results showed that the fractional increase in resistance increases linearly versus the increase of centripetal acceleration, and there is a linear relationship between the acceleration and the strain. These shed light on using carbon nanotube films as acceleration sensors for many potential applications.
基金Financially supported by National Natural Science Foundation of China(No.51176013)Chinese Specialized Research Fund for the Doctoral Program of Higher Education(No.20091101110014)
文摘The superimposed influences of the blade rows in a multistage compressor are important because different matches of upstream and downstream blades can result in significant differences in the stator wake oscillation. Numerical investigation of the axial stator wake oscillation, which is affected upstream by the axial rotor and downstream by the radial rotor, was performed in an axial-radial combined compressor. Many configurations with different blade numbers and locations, which influence axial stator wake oscillation were investigated. When rotors have equal blade numbers, the axial stator wake oscillates periodically versus time within time T(moving blade passing 1/3 revolution). In contrast, stator wake oscillates irregularly within T when rotors have different blade numbers. A model-split subtraction method is presented in order to separate the influences of the individual blade rows on the wake oscillation of the axial stator. Analysis from the rotor-stator configuration showed that the unsteady flow angle fluctuation response is caused by the upstream rotor. For the rotor-stator-rotor configuration, the unsteady flow angle fluctuations are influenced by upand downstream blade rows. With the model-split subtraction method, the upand downstream influences on the flow angle fluctuation could be clearly separated and quantified. Low amplitudes could be observed when the influences from upand downstream moving rows were superimposed with the "positive peaknegative peak" type wave. Clocking investigations were carried out to change the relative superimposed phase of influences from the surrounding blade rows in order to modulate the amplitudes of the axial stator wake oscillation. However, the amplitudes did not reach the maximum when they were superimposed with "positive peak-positive peak" type wave due to the impact of the interaction between the two moving blade rows.
