A novel method for precise measurement of complex reflection coeffcient using a four-port reflectometer is presented. First, three new complex system constants are introduced,which depend only on the scattering parame...A novel method for precise measurement of complex reflection coeffcient using a four-port reflectometer is presented. First, three new complex system constants are introduced,which depend only on the scattering parameters of the four-port reflectometer. Therefore, the stability of the reflectometer is greatly improved. Then, these complex system constants are used to determine the complex reflection coeffcient F of the device under test by calibrating the reflectometer. Finally, a four-port reflectometer comprising a magic tee and a power detector is constructed and excellent experimental results are obtained.展开更多
目的探讨加速康复外科(ERAS)联合单孔腹腔镜胆囊切除术(LC)的治疗效果与安全性。方法选取2020年12月-2021年11月该院行LC的患者120例,按随机数表法分为两组,每组60例,两组患者均采用ERAS理念处理。其中,对照组采取四孔法,观察组采取单...目的探讨加速康复外科(ERAS)联合单孔腹腔镜胆囊切除术(LC)的治疗效果与安全性。方法选取2020年12月-2021年11月该院行LC的患者120例,按随机数表法分为两组,每组60例,两组患者均采用ERAS理念处理。其中,对照组采取四孔法,观察组采取单孔法。比较两组患者手术相关指标、不同时点视觉模拟评分(VAS)变化、血清髓过氧化物酶(MPO)、白细胞介素-1(IL-1)、免疫球蛋白A(IgA)、免疫球蛋白M(IgM)和免疫球蛋白G(IgG)水平,以及并发症发生率和随访结果。结果观察组手术时间较对照组长,术中出血量较对照组少,术后排气时间和住院时间短于对照组,住院费用多于对照组,术后12和24 h VAS低于对照组,术后1、3和7 d血清IgA、IgG和IgM水平高于对照组,术后1、3和7 d血清IL-1和MPO水平低于对照组,并发症发生率低于对照组(10.00%和25.00%),术后1个月胃肠道疾病生存质量指数(GIQLI)和腹壁美容满意度高于对照组,差异均有统计学意义(P<0.05)。结论ERAS联合单孔LC,可减轻患者应激反应,减少对机体免疫力的影响,减少术后并发症,缩短住院时间,且脐部褶皱处切口隐蔽,美容效果好,安全性高。展开更多
文摘A novel method for precise measurement of complex reflection coeffcient using a four-port reflectometer is presented. First, three new complex system constants are introduced,which depend only on the scattering parameters of the four-port reflectometer. Therefore, the stability of the reflectometer is greatly improved. Then, these complex system constants are used to determine the complex reflection coeffcient F of the device under test by calibrating the reflectometer. Finally, a four-port reflectometer comprising a magic tee and a power detector is constructed and excellent experimental results are obtained.
文摘目的探讨加速康复外科(ERAS)联合单孔腹腔镜胆囊切除术(LC)的治疗效果与安全性。方法选取2020年12月-2021年11月该院行LC的患者120例,按随机数表法分为两组,每组60例,两组患者均采用ERAS理念处理。其中,对照组采取四孔法,观察组采取单孔法。比较两组患者手术相关指标、不同时点视觉模拟评分(VAS)变化、血清髓过氧化物酶(MPO)、白细胞介素-1(IL-1)、免疫球蛋白A(IgA)、免疫球蛋白M(IgM)和免疫球蛋白G(IgG)水平,以及并发症发生率和随访结果。结果观察组手术时间较对照组长,术中出血量较对照组少,术后排气时间和住院时间短于对照组,住院费用多于对照组,术后12和24 h VAS低于对照组,术后1、3和7 d血清IgA、IgG和IgM水平高于对照组,术后1、3和7 d血清IL-1和MPO水平低于对照组,并发症发生率低于对照组(10.00%和25.00%),术后1个月胃肠道疾病生存质量指数(GIQLI)和腹壁美容满意度高于对照组,差异均有统计学意义(P<0.05)。结论ERAS联合单孔LC,可减轻患者应激反应,减少对机体免疫力的影响,减少术后并发症,缩短住院时间,且脐部褶皱处切口隐蔽,美容效果好,安全性高。
