目的:分析腹腔镜与内镜联合治疗对胆囊结石伴胆管结石患者的影响。方法:选取2022年5月—2023年5月贵州医科大学附属白云医院收治的70例胆囊结石伴胆管结石患者作为研究对象。根据随机数表法将其分为对照组和观察组,各35例。对照组给予...目的:分析腹腔镜与内镜联合治疗对胆囊结石伴胆管结石患者的影响。方法:选取2022年5月—2023年5月贵州医科大学附属白云医院收治的70例胆囊结石伴胆管结石患者作为研究对象。根据随机数表法将其分为对照组和观察组,各35例。对照组给予传统手术治疗,观察组给予腹腔镜与内镜联合治疗。比较两组术前、术后3 d疼痛情况及生活质量,围手术期指标及术后并发症。结果:术后3 d,观察组视觉模拟评分法(visual analogue scale,VAS)评分低于对照组,简明生活质量量表(the MOS item short form 36 health survey,SF-36)评分高于对照组,差异有统计学意义(P<0.05)。观察组术中出血量少于对照组,术后首次排气时间、住院时间均短于对照组,差异有统计学意义(P<0.05)。两组术后并发症发生率比较,差异无统计学意义(P>0.05)。结论:腹腔镜与内镜联合治疗胆囊结石伴胆管结石的效果显著,具有疼痛轻、术中出血量少、术后恢复快等优点,从而能提升患者生活质量。展开更多
This paper studies the mode selection of Lamb waves for evaluating solid plates with liquid loading. For this purpose, the Lamb wave selected should have the features such as zero normal displacement components at the...This paper studies the mode selection of Lamb waves for evaluating solid plates with liquid loading. For this purpose, the Lamb wave selected should have the features such as zero normal displacement components at the plate surface in contact with liquid, small dispersion, and maximum group velocity. It is found that when the phase velocity of Lamb wave is equal to the longitudinal wave velocity of the plate material, its normal displacement at the plate surface is always zero. Through the numerical analyses, the specific S2 Lamb wave that has zero normal displacement component at the plate surface, small dispersion and maximum group velocity compared with the other Lamb waves has been found. With respect to the specific S2 Lamb wave, some experimental examinations have been carried out. It is found that the liquid loading on the plate surface has less influence on the specific S2 Lamb wave signal but it can effectively eliminate the other signals. Moreover, the specific S2 Lamb wave selected exhibits the capability of detecting multiple defects in the solid plate with the liquid loading. It can be concluded that the specific S2 Lamb wave selected is suitable for the evaluation of solid plates with liquid loading.展开更多
A modal expansion approach has been proposed for investigating generation of ultrasonic Lamb waves by electromagnetic acoustic transducers（EMATs）.Based on the current distribution of the EMAT＇s meandering coil,the ...A modal expansion approach has been proposed for investigating generation of ultrasonic Lamb waves by electromagnetic acoustic transducers（EMATs）.Based on the current distribution of the EMAT＇s meandering coil,the formal solution for the Lorentz surface stress applied on the plate surface has been derived.Then the function of the wave-number spectral density of the Lorentz surface stress for generating ultrasonic Lamb waves has been obtained using the spatial Fourier transform.On this basis,with the modal expansion approach for waveguide excitation,the mathematical expression of the Lamb wave＇s mode expansion coefficient has been deduced,which is closely related with the geometrical parameters of the EMAT＇s meandering coil.The mathematical relationship between the Lamb wave＇s mode expansion coefficient and the EMAT＇s geometrical parameters,obtained in this paper,lays a theoretical foundation for exactly analyzing generation of Lamb waves by EMATs.Further,the numerical analyses performed indicate that the Lamb wave＇s mode expansion coefficient can be appropriately adjusted by changing the geometrical parameters of the EMAT＇s coil,and thus the unwanted Lamb wave modes can be effectively restrained.This result provides a theoretical basis for generating a single and pure Lamb wave mode by the meandering coil EMAT.展开更多
文摘目的:分析腹腔镜与内镜联合治疗对胆囊结石伴胆管结石患者的影响。方法:选取2022年5月—2023年5月贵州医科大学附属白云医院收治的70例胆囊结石伴胆管结石患者作为研究对象。根据随机数表法将其分为对照组和观察组,各35例。对照组给予传统手术治疗,观察组给予腹腔镜与内镜联合治疗。比较两组术前、术后3 d疼痛情况及生活质量,围手术期指标及术后并发症。结果:术后3 d,观察组视觉模拟评分法(visual analogue scale,VAS)评分低于对照组,简明生活质量量表(the MOS item short form 36 health survey,SF-36)评分高于对照组,差异有统计学意义(P<0.05)。观察组术中出血量少于对照组,术后首次排气时间、住院时间均短于对照组,差异有统计学意义(P<0.05)。两组术后并发症发生率比较,差异无统计学意义(P>0.05)。结论:腹腔镜与内镜联合治疗胆囊结石伴胆管结石的效果显著,具有疼痛轻、术中出血量少、术后恢复快等优点,从而能提升患者生活质量。
基金supported by the National Natural Science Foundation of China(Grant No.11274388)
文摘This paper studies the mode selection of Lamb waves for evaluating solid plates with liquid loading. For this purpose, the Lamb wave selected should have the features such as zero normal displacement components at the plate surface in contact with liquid, small dispersion, and maximum group velocity. It is found that when the phase velocity of Lamb wave is equal to the longitudinal wave velocity of the plate material, its normal displacement at the plate surface is always zero. Through the numerical analyses, the specific S2 Lamb wave that has zero normal displacement component at the plate surface, small dispersion and maximum group velocity compared with the other Lamb waves has been found. With respect to the specific S2 Lamb wave, some experimental examinations have been carried out. It is found that the liquid loading on the plate surface has less influence on the specific S2 Lamb wave signal but it can effectively eliminate the other signals. Moreover, the specific S2 Lamb wave selected exhibits the capability of detecting multiple defects in the solid plate with the liquid loading. It can be concluded that the specific S2 Lamb wave selected is suitable for the evaluation of solid plates with liquid loading.
基金supported by the National Natural Science Foundation of China(11274388)
文摘A modal expansion approach has been proposed for investigating generation of ultrasonic Lamb waves by electromagnetic acoustic transducers（EMATs）.Based on the current distribution of the EMAT＇s meandering coil,the formal solution for the Lorentz surface stress applied on the plate surface has been derived.Then the function of the wave-number spectral density of the Lorentz surface stress for generating ultrasonic Lamb waves has been obtained using the spatial Fourier transform.On this basis,with the modal expansion approach for waveguide excitation,the mathematical expression of the Lamb wave＇s mode expansion coefficient has been deduced,which is closely related with the geometrical parameters of the EMAT＇s meandering coil.The mathematical relationship between the Lamb wave＇s mode expansion coefficient and the EMAT＇s geometrical parameters,obtained in this paper,lays a theoretical foundation for exactly analyzing generation of Lamb waves by EMATs.Further,the numerical analyses performed indicate that the Lamb wave＇s mode expansion coefficient can be appropriately adjusted by changing the geometrical parameters of the EMAT＇s coil,and thus the unwanted Lamb wave modes can be effectively restrained.This result provides a theoretical basis for generating a single and pure Lamb wave mode by the meandering coil EMAT.
