Objective:To evaluate the therapeutic effect of dynamic fixation with a hook plate-double loop plate internal fixation system for high-energy acromioclavicular joint complex dislocation(denoted as HACD,i.e.,Rockwood t...Objective:To evaluate the therapeutic effect of dynamic fixation with a hook plate-double loop plate internal fixation system for high-energy acromioclavicular joint complex dislocation(denoted as HACD,i.e.,Rockwood type III-V dislocation).Methods:Fifty-eight patients with HACD were selected and evenly divided by drawing lots.The experimental group underwent ligament reconstruction treatment,while the reference group received hook plate fixation treatment.The efficacy and other indicators were compared between the groups.Results:The overall effective rates between the groups were similar(P>0.05).The experimental group had a longer surgical duration,lower pain scores at 6 months postoperatively,higher shoulder joint function scores,and a lower complication rate,with P<0.05 when compared between groups.Conclusion:The effectiveness of the double loop plate internal fixation system ligament reconstruction treatment for patients with HACD is comparable to that of hook plate fixation treatment.Although the surgical duration is slightly longer,postoperative pain is milder,facilitating the recovery of shoulder joint function in patients and offering higher safety.展开更多
This paper presents an experimental study including visualization on a flat plate closed loop pulsating heat pipes.It consists of a total of 40 channels with square cross section(2 mm×2 mm,165 mm long) machined d...This paper presents an experimental study including visualization on a flat plate closed loop pulsating heat pipes.It consists of a total of 40 channels with square cross section(2 mm×2 mm,165 mm long) machined directly on an aluminum plate(180 mm×120 mm×3 mm) covered by a transparent plate.The working fluid employed is ethanol.As a result,various flow patterns and their transitions are observed and found to be related to the fluid fill ratio,input heat load and the device orientation.Also the operational characteristics and working mechanism are discussed.展开更多
This paper presents an experimental study on a flat plate closed loop pulsating heat pipes. It consisted of total 40 channels with square cross section （2 × 2 mm^2, 165 mm long） machined directly on an aluminum...This paper presents an experimental study on a flat plate closed loop pulsating heat pipes. It consisted of total 40 channels with square cross section （2 × 2 mm^2, 165 mm long） machined directly on an aluminum plate（180×120×3 nm^2）, which was covered by a transparent plate. The working fluid employed was ethanol. As the results, the influence parameters of thermal performance were investigated, such as filling ratio, heat load and operational orientations etc. Filling ratio was found to be a critical parameter, and its effect was rather complicated. According to its values the PHP plate could have four distinct working zones with different operational characteristics and heat transfer performance. The effect of heat load on thermal performance was found to be positive, and in general, iucrcasing the heat load would improve heat transfer performance. In order to analyze the effect of gravity on thermal performance, three different heat modes and total seven tilt angles were tested and compared. Successful operation at all orientations with respect to gravity was also achieved.展开更多
Using ethanol or acetone as the working fluid, the performance of starting up and heat transfer of closed-loop plate oscillating heat pipe with parallel channels(POHP-PC) were experimentally investigated by varying fi...Using ethanol or acetone as the working fluid, the performance of starting up and heat transfer of closed-loop plate oscillating heat pipe with parallel channels(POHP-PC) were experimentally investigated by varying filling ratio, inclination, working fluids and heating power. The performance of the tested pulsating heat pipe was mainly evaluated by thermal resistance and wall temperature. Heating copper block and cold water bath were adopted in the experimental investigations. It was found that oscillating heat pipe with filling ratio of 50% started up earlier than that with 70% when heating input was 159.4 W, however, it has similar starting up performance with filling ratio of 50% as compared to 70% on the condition of heat input of 205.4 W. And heat pipe with filling ratio of 10% could not start up but directly transit to dry burning. A reasonable filling ratio range of 35%-70% was needed in order to achieve better performance, and there are different optimal filling ratios with different heating inputs- the more heating input, the higher optimal filling ratio, and vice versa. However, the dry burning appeared easily with low filling ratio, especially at very low filling ratio, such as 10%. And higher filling ratio, such as 70%, resulted in higher heat transfer( dry burning) limit. With filling ratio of 70% and inclination of 75°, oscillating heat pipe with acetone started up with heating input of just 24 W, but for ethanol, it needed to be achieved 68 W, Furthermore, the start time with acetone was similar as compared to that with ethanol. For steady operating state, the heating input with acetone was about 80 W, but it transited to dry burning state when heating input was greater than 160 W. However, for ethanol, the heating input was in vicinity of 160 W. Furthermore, thermal resistance with acetone was lower than that with ethanol at the same heating input of 120 W.展开更多
We propose a novel resonator that can reduce magnetic field leakage using a ferrite plate. The proposed resonator consists of a rectangular loop, a ferrite plate, and an L-matching network. The ferrite plate is used a...We propose a novel resonator that can reduce magnetic field leakage using a ferrite plate. The proposed resonator consists of a rectangular loop, a ferrite plate, and an L-matching network. The ferrite plate is used as an H-field reflector to direct more H-field to each resonator, and the L-matching network is employed to match the 50 Ω of the feed cable at 13.56 MHz. Two identical resonators with dimensions of 30 cm × 15 cm are separated by 50 cm, and the resulting transmission efficiency is about ?12.3 dB at 13.56 MHz. This is about 4.2 dB higher than the resonators without the ferrite plate.展开更多
目的比较骨科机器人与关节镜辅助技术在带袢钛板内固定治疗RockwoodⅢ、Ⅳ型急性肩锁关节脱位的疗效。方法回顾分析2022年10月—2024年12月采用带袢钛板内固定治疗的且符合选择标准的33例肩锁关节脱位患者临床资料。根据辅助手术方式不...目的比较骨科机器人与关节镜辅助技术在带袢钛板内固定治疗RockwoodⅢ、Ⅳ型急性肩锁关节脱位的疗效。方法回顾分析2022年10月—2024年12月采用带袢钛板内固定治疗的且符合选择标准的33例肩锁关节脱位患者临床资料。根据辅助手术方式不同分为机器人组(17例)和关节镜组(16例)。两组患者性别、年龄、致伤原因、侧别、Rockwood分型、受伤至手术时间及术前疼痛视觉模拟评分(VAS)、Constant-Murley评分、喙锁距离(coracoclavicular distance,CCD)等基线资料比较差异均无统计学意义(P>0.05)。记录并比较两组患者手术时间、术中出血量、手术切口总长度、术中透视次数、术后1 d VAS评分变化值(与术前比较)及并发症发生情况;术后2 d和6个月时三维CT冠状面上测量CCD评价肩锁关节分离程度;术后2 d对锁骨及喙突钻孔位置的准确性进行评估;术前及术后1、6个月采用Constant-Murley评分评估肩关节功能。结果两组手术切口均Ⅰ期愈合。机器人组手术时间、术中出血量、手术切口总长度、术后1 d VAS评分变化值均显著少于关节镜组(P<0.05),术中透视次数显著多于关节镜组(P<0.05)。两组患者均获随访,随访时间6~12个月,平均10.15个月。术后2 d DR检查显示肩锁关节均已复位,两组术后2 d和6个月CCD均显著低于术前,术后6个月高于术后2 d(P<0.05);两组间术后两个时间点CCD比较差异均无统计学意义(P>0.05)。术后2 d两组患者锁骨钻孔准确性比较差异无统计学意义(P>0.05);机器人组喙突钻孔准确性低于关节镜组,差异有统计学意义(P<0.05)。两组患者均未发生血管神经损伤、喙突骨折、再脱位等并发症。两组术后1、6个月Constant-Murley评分均显著高于术前,术后6个月高于术后1个月,差异均有统计学意义(P<0.05);机器人组术后1个月ConstantMurley评分显著高于关节镜组(P<0.05),术后6个月两组差异无统计学意义(P>0.05)。结论两种辅助技术下带袢钛板内固定治疗肩锁关节脱位均能取得较好疗效,机器人辅助手术在切口长度、术中出血量、术后早期疼痛缓解、肩关节功能改善方面有优势,而关节镜辅助手术在术中透视次数及喙突钻孔准确性方面更有优势。展开更多
A novel tunable comb filter composed of a single-mode/multimode/polarization-maintaining-fiber-based Sagnac fiber loop is proposed and experimentally demonstrated. The filter tunability is achieved by rotating the pol...A novel tunable comb filter composed of a single-mode/multimode/polarization-maintaining-fiber-based Sagnac fiber loop is proposed and experimentally demonstrated. The filter tunability is achieved by rotating the polarization controller. The spectral shift is dependent on rotation direction and the position of the polarization controller. In addition, the adjustable range achieved by rotating the half-wave-plate polarization controller is twice higher than that of the quarter-wave-plate one.展开更多
文摘Objective:To evaluate the therapeutic effect of dynamic fixation with a hook plate-double loop plate internal fixation system for high-energy acromioclavicular joint complex dislocation(denoted as HACD,i.e.,Rockwood type III-V dislocation).Methods:Fifty-eight patients with HACD were selected and evenly divided by drawing lots.The experimental group underwent ligament reconstruction treatment,while the reference group received hook plate fixation treatment.The efficacy and other indicators were compared between the groups.Results:The overall effective rates between the groups were similar(P>0.05).The experimental group had a longer surgical duration,lower pain scores at 6 months postoperatively,higher shoulder joint function scores,and a lower complication rate,with P<0.05 when compared between groups.Conclusion:The effectiveness of the double loop plate internal fixation system ligament reconstruction treatment for patients with HACD is comparable to that of hook plate fixation treatment.Although the surgical duration is slightly longer,postoperative pain is milder,facilitating the recovery of shoulder joint function in patients and offering higher safety.
基金the Ger man National Science Foundation (GR-412/33-2)Shanghai Leading Academic Discipline Project (No.B604)
文摘This paper presents an experimental study including visualization on a flat plate closed loop pulsating heat pipes.It consists of a total of 40 channels with square cross section(2 mm×2 mm,165 mm long) machined directly on an aluminum plate(180 mm×120 mm×3 mm) covered by a transparent plate.The working fluid employed is ethanol.As a result,various flow patterns and their transitions are observed and found to be related to the fluid fill ratio,input heat load and the device orientation.Also the operational characteristics and working mechanism are discussed.
基金Supported by the Ger man National Science Foundation (DFG)(No. GR412/33)
文摘This paper presents an experimental study on a flat plate closed loop pulsating heat pipes. It consisted of total 40 channels with square cross section （2 × 2 mm^2, 165 mm long） machined directly on an aluminum plate（180×120×3 nm^2）, which was covered by a transparent plate. The working fluid employed was ethanol. As the results, the influence parameters of thermal performance were investigated, such as filling ratio, heat load and operational orientations etc. Filling ratio was found to be a critical parameter, and its effect was rather complicated. According to its values the PHP plate could have four distinct working zones with different operational characteristics and heat transfer performance. The effect of heat load on thermal performance was found to be positive, and in general, iucrcasing the heat load would improve heat transfer performance. In order to analyze the effect of gravity on thermal performance, three different heat modes and total seven tilt angles were tested and compared. Successful operation at all orientations with respect to gravity was also achieved.
基金Project 51306198 supported by National Natural Science Foundation of ChinaProject 00921915023 supported by Organization Department of Beijing+1 种基金Project NR2013K07 supported by Beijing Key Lab of Heating,Gas Supply,Ventilating and Air Conditioning EngineeringProject 331614013 supported by Beijing University of Civil Engineering and Architecture
文摘Using ethanol or acetone as the working fluid, the performance of starting up and heat transfer of closed-loop plate oscillating heat pipe with parallel channels(POHP-PC) were experimentally investigated by varying filling ratio, inclination, working fluids and heating power. The performance of the tested pulsating heat pipe was mainly evaluated by thermal resistance and wall temperature. Heating copper block and cold water bath were adopted in the experimental investigations. It was found that oscillating heat pipe with filling ratio of 50% started up earlier than that with 70% when heating input was 159.4 W, however, it has similar starting up performance with filling ratio of 50% as compared to 70% on the condition of heat input of 205.4 W. And heat pipe with filling ratio of 10% could not start up but directly transit to dry burning. A reasonable filling ratio range of 35%-70% was needed in order to achieve better performance, and there are different optimal filling ratios with different heating inputs- the more heating input, the higher optimal filling ratio, and vice versa. However, the dry burning appeared easily with low filling ratio, especially at very low filling ratio, such as 10%. And higher filling ratio, such as 70%, resulted in higher heat transfer( dry burning) limit. With filling ratio of 70% and inclination of 75°, oscillating heat pipe with acetone started up with heating input of just 24 W, but for ethanol, it needed to be achieved 68 W, Furthermore, the start time with acetone was similar as compared to that with ethanol. For steady operating state, the heating input with acetone was about 80 W, but it transited to dry burning state when heating input was greater than 160 W. However, for ethanol, the heating input was in vicinity of 160 W. Furthermore, thermal resistance with acetone was lower than that with ethanol at the same heating input of 120 W.
文摘We propose a novel resonator that can reduce magnetic field leakage using a ferrite plate. The proposed resonator consists of a rectangular loop, a ferrite plate, and an L-matching network. The ferrite plate is used as an H-field reflector to direct more H-field to each resonator, and the L-matching network is employed to match the 50 Ω of the feed cable at 13.56 MHz. Two identical resonators with dimensions of 30 cm × 15 cm are separated by 50 cm, and the resulting transmission efficiency is about ?12.3 dB at 13.56 MHz. This is about 4.2 dB higher than the resonators without the ferrite plate.
文摘目的比较骨科机器人与关节镜辅助技术在带袢钛板内固定治疗RockwoodⅢ、Ⅳ型急性肩锁关节脱位的疗效。方法回顾分析2022年10月—2024年12月采用带袢钛板内固定治疗的且符合选择标准的33例肩锁关节脱位患者临床资料。根据辅助手术方式不同分为机器人组(17例)和关节镜组(16例)。两组患者性别、年龄、致伤原因、侧别、Rockwood分型、受伤至手术时间及术前疼痛视觉模拟评分(VAS)、Constant-Murley评分、喙锁距离(coracoclavicular distance,CCD)等基线资料比较差异均无统计学意义(P>0.05)。记录并比较两组患者手术时间、术中出血量、手术切口总长度、术中透视次数、术后1 d VAS评分变化值(与术前比较)及并发症发生情况;术后2 d和6个月时三维CT冠状面上测量CCD评价肩锁关节分离程度;术后2 d对锁骨及喙突钻孔位置的准确性进行评估;术前及术后1、6个月采用Constant-Murley评分评估肩关节功能。结果两组手术切口均Ⅰ期愈合。机器人组手术时间、术中出血量、手术切口总长度、术后1 d VAS评分变化值均显著少于关节镜组(P<0.05),术中透视次数显著多于关节镜组(P<0.05)。两组患者均获随访,随访时间6~12个月,平均10.15个月。术后2 d DR检查显示肩锁关节均已复位,两组术后2 d和6个月CCD均显著低于术前,术后6个月高于术后2 d(P<0.05);两组间术后两个时间点CCD比较差异均无统计学意义(P>0.05)。术后2 d两组患者锁骨钻孔准确性比较差异无统计学意义(P>0.05);机器人组喙突钻孔准确性低于关节镜组,差异有统计学意义(P<0.05)。两组患者均未发生血管神经损伤、喙突骨折、再脱位等并发症。两组术后1、6个月Constant-Murley评分均显著高于术前,术后6个月高于术后1个月,差异均有统计学意义(P<0.05);机器人组术后1个月ConstantMurley评分显著高于关节镜组(P<0.05),术后6个月两组差异无统计学意义(P>0.05)。结论两种辅助技术下带袢钛板内固定治疗肩锁关节脱位均能取得较好疗效,机器人辅助手术在切口长度、术中出血量、术后早期疼痛缓解、肩关节功能改善方面有优势,而关节镜辅助手术在术中透视次数及喙突钻孔准确性方面更有优势。
基金supported by the National Natural Science Foundation of China (Grant Nos. 11274181,10974100,and 10674075)the Tianjin Key Program of Application Foundations and Future Technology Research Project,China (Grant No. 10JCZDJC24300)the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20120031110033)
文摘A novel tunable comb filter composed of a single-mode/multimode/polarization-maintaining-fiber-based Sagnac fiber loop is proposed and experimentally demonstrated. The filter tunability is achieved by rotating the polarization controller. The spectral shift is dependent on rotation direction and the position of the polarization controller. In addition, the adjustable range achieved by rotating the half-wave-plate polarization controller is twice higher than that of the quarter-wave-plate one.
