There are about 25 factories specialized in production of windshield wiper in China, reaching total output of nearly 1.9 million sets in 1993. Three of them are of strong production capacity. They are VALEO Wenling Au...There are about 25 factories specialized in production of windshield wiper in China, reaching total output of nearly 1.9 million sets in 1993. Three of them are of strong production capacity. They are VALEO Wenling Auto Parts & Accessories Co. Ltd., Shanghai Industry Traffic Electrical Apparatus Co. Ltd.,展开更多
电动汽车动力系统噪声降低,导致雨刮反转引起的响度和尖锐度相矛盾问题更加突出,多目标优化方法有助于指导多频带协同主动控制,提升雨刮风窗系统声品质。通过实车噪声测试试验采集,分析雨刮运动过程中的噪声数据。基于各特征频带幅值与...电动汽车动力系统噪声降低,导致雨刮反转引起的响度和尖锐度相矛盾问题更加突出,多目标优化方法有助于指导多频带协同主动控制,提升雨刮风窗系统声品质。通过实车噪声测试试验采集,分析雨刮运动过程中的噪声数据。基于各特征频带幅值与响度和尖锐度的直接映射关系构建多目标优化公式。敏感性分析确定一组影响响度和尖锐度变化最大的敏感频带,通过多目标遗传算法NSGA-Ⅱ求解得到响度和尖锐度综合最优时对应的敏感频带幅值,通过基于滤波残差最小均方算法(filtered-error least mean square algorithm,FELMS)自适应滤波器的ANE算法进行响度和尖锐度的主动控制仿真,验证最优解的可行性。结果表明,响度降低15.4%,尖锐度降低18%,响度达到94%最优解效果,尖锐度达到87%最优解效果,声品质得到改善。展开更多
Objective:This study aimed to explore the clinical efficiency of an improved transosseous pullout suture technique for arthroscopic repair of a meniscus root tear.Methods:From January 2017 to January 2021,53 patients ...Objective:This study aimed to explore the clinical efficiency of an improved transosseous pullout suture technique for arthroscopic repair of a meniscus root tear.Methods:From January 2017 to January 2021,53 patients with posterior meniscus root tears combined with anterior cruciate ligament(ACL)and/or posterior cruciate ligament(PCL)tears were collected.Totally,in 29 patients(group A),the 2.0 mm modified pullout tunnel method was used to suture the posterior meniscus root,while 24 patients(group B)were treated with the traditional 4.5 mm pullout tunnel method.In group A,20 patients had lateral meniscus posterior root(LMPR)combined with ACL tears,5 patients had LMPR combined with ACL and PCL tears,and 4 patients had medial meniscus posterior root(MMPR)combined with ACL tears.In group B,19 patients had LMPR combined with ACL tears,3 patients had LMPR combined with ACL and PCL tears,and 2 patients had MMPR combined with ACL tears.The improvement of the Lysholm and VAS scores and the incidence of complications in group A and group B before the operation,1 month and 3 months after the operation,and after the final follow-up were compared.Results:Preoperative Lysholm score was 26.0±5.6 in group A and 26.7±5.8 in group B(P>0.05).One-month postoperative Lysholm score was 66.5±5.7 in group A and 54.3±2.4 in group B(P<0.001).Three-month postoperative Lysholm score was 81.1±7.2 in group A and 73.2±9.7 in group B(P<0.05).Lysholm scores after the final follow-up was 90.3±5.6 in group A and 90.0±5.0 in group B(P>0.05).Preoperative VAS score was 6.3±1.4 in group A and 6.3±1.2 in group B(P>0.05).One-month postoperative VAS score was 1.8±0.7 in group A and 2.4±0.9 in group B(P<0.05).Three-month postoperative VAS score was 0.7±0.6 in group A and 0.8±0.6 in group B(P>0.05).VAS score after the final follow-up was 0.2±0.4 in group A and 0.3±0.5 in group B(P>0.05).Conclusion:The improved transosseous pullout suture technique using a smaller 2.0 mm bone tunnel can virtually eliminate the risk of conflict with other bone tunnels and facilitate the management of bone tunnels in multiple ligament injuries,while also diminishing suture abrasion caused by the windshield wiper effect.The technique achieves good clinical efficacy.展开更多
文摘There are about 25 factories specialized in production of windshield wiper in China, reaching total output of nearly 1.9 million sets in 1993. Three of them are of strong production capacity. They are VALEO Wenling Auto Parts & Accessories Co. Ltd., Shanghai Industry Traffic Electrical Apparatus Co. Ltd.,
文摘电动汽车动力系统噪声降低,导致雨刮反转引起的响度和尖锐度相矛盾问题更加突出,多目标优化方法有助于指导多频带协同主动控制,提升雨刮风窗系统声品质。通过实车噪声测试试验采集,分析雨刮运动过程中的噪声数据。基于各特征频带幅值与响度和尖锐度的直接映射关系构建多目标优化公式。敏感性分析确定一组影响响度和尖锐度变化最大的敏感频带,通过多目标遗传算法NSGA-Ⅱ求解得到响度和尖锐度综合最优时对应的敏感频带幅值,通过基于滤波残差最小均方算法(filtered-error least mean square algorithm,FELMS)自适应滤波器的ANE算法进行响度和尖锐度的主动控制仿真,验证最优解的可行性。结果表明,响度降低15.4%,尖锐度降低18%,响度达到94%最优解效果,尖锐度达到87%最优解效果,声品质得到改善。
基金supported by the Natural Science Foundation of Hubei Province(No.2018CFC832).
文摘Objective:This study aimed to explore the clinical efficiency of an improved transosseous pullout suture technique for arthroscopic repair of a meniscus root tear.Methods:From January 2017 to January 2021,53 patients with posterior meniscus root tears combined with anterior cruciate ligament(ACL)and/or posterior cruciate ligament(PCL)tears were collected.Totally,in 29 patients(group A),the 2.0 mm modified pullout tunnel method was used to suture the posterior meniscus root,while 24 patients(group B)were treated with the traditional 4.5 mm pullout tunnel method.In group A,20 patients had lateral meniscus posterior root(LMPR)combined with ACL tears,5 patients had LMPR combined with ACL and PCL tears,and 4 patients had medial meniscus posterior root(MMPR)combined with ACL tears.In group B,19 patients had LMPR combined with ACL tears,3 patients had LMPR combined with ACL and PCL tears,and 2 patients had MMPR combined with ACL tears.The improvement of the Lysholm and VAS scores and the incidence of complications in group A and group B before the operation,1 month and 3 months after the operation,and after the final follow-up were compared.Results:Preoperative Lysholm score was 26.0±5.6 in group A and 26.7±5.8 in group B(P>0.05).One-month postoperative Lysholm score was 66.5±5.7 in group A and 54.3±2.4 in group B(P<0.001).Three-month postoperative Lysholm score was 81.1±7.2 in group A and 73.2±9.7 in group B(P<0.05).Lysholm scores after the final follow-up was 90.3±5.6 in group A and 90.0±5.0 in group B(P>0.05).Preoperative VAS score was 6.3±1.4 in group A and 6.3±1.2 in group B(P>0.05).One-month postoperative VAS score was 1.8±0.7 in group A and 2.4±0.9 in group B(P<0.05).Three-month postoperative VAS score was 0.7±0.6 in group A and 0.8±0.6 in group B(P>0.05).VAS score after the final follow-up was 0.2±0.4 in group A and 0.3±0.5 in group B(P>0.05).Conclusion:The improved transosseous pullout suture technique using a smaller 2.0 mm bone tunnel can virtually eliminate the risk of conflict with other bone tunnels and facilitate the management of bone tunnels in multiple ligament injuries,while also diminishing suture abrasion caused by the windshield wiper effect.The technique achieves good clinical efficacy.
