We present in this paper a wideband RF demodulator using a five-port correlator and a power detector for channel sounding applications. The demodulator has been fabricated using microstrip components. The correlator r...We present in this paper a wideband RF demodulator using a five-port correlator and a power detector for channel sounding applications. The demodulator has been fabricated using microstrip components. The correlator receives from the five-port qualities that allow it to be low-cost and less sensitive to the phase and amplitude imbalances. A calibration procedure is proposed to find the complex envelope of the RF signal applied at the input of the five-port correlator. Simulation with Advanced Design System software and measurement results have been conducted to demonstrate its capabilities as a RF signal demodulator operating in a wideband around 2.4 GHz frequency.展开更多
目的探讨单孔加一孔腹腔镜技术在根治性远端胃癌手术中的可行性及优势。方法回顾性收集2019年9月至2021年9月期间于潍坊市人民医院胃肠外科行单孔加一孔腹腔镜远端胃癌根治术(single incision plus one port laparoscopic distal gastre...目的探讨单孔加一孔腹腔镜技术在根治性远端胃癌手术中的可行性及优势。方法回顾性收集2019年9月至2021年9月期间于潍坊市人民医院胃肠外科行单孔加一孔腹腔镜远端胃癌根治术(single incision plus one port laparoscopic distal gastrectomy,SILDG+1)的44例病人的临床资料(SILDG+1组);收集同期由同一手术团队行传统五孔腹腔镜远端胃癌根治术(multi-port laparoscopy distal gastrectomy,MLDG)的48例病人作为对照(MLDG组),比较两组术后胃肠道功能、机体应激及炎性反应状态、美学效果。结果围手术期指标结果显示:SILDG+1组与MLDG组比较,手术时间长[(219.1±15.1)min比(196.3±23.0)min,P<0.001],出血量少[(96.7±14.8)mL比(105.3±18.1)mL,P=0.015],术后首次下床时间短[(31.14±5.84)h比(39.21±5.26)h,P<0.001],术后首次肛门排气时间短[(1.98±0.88)d比(2.44±0.99)d,P=0.021],术后住院时间短[(9.05±1.33)d比(10.08±1.88)d,P=0.003],差异均有统计学意义。两组病人在术后第1、2、3天视觉疼痛评分(单位:分,3.16±0.75比3.69±0.72、2.27±0.92比2.94±0.76、1.36±0.81比1.92±0.96),术后美学评分[(8.09±1.12)分比(6.02±1.19)分],术后第1、3、5天C反应蛋白水平[(37.27±14.19)mg/L比(45.72±19.14)mg/L、(71.42±26.04)mg/L比(87.51±40.21)mg/L、(30.93±19.67)mg/L比(40.81±22.35)mg/L],差异均具有统计学意义(均P<0.05),SILDG+1组优于MLDG组。两组病人术后并发症[3例(6.8%)比5例(10.4%),P=0.809]差异无统计学意义。术后第1、3、5天总蛋白水平[(55.87±5.51)g/L比(54.50±5.39)g/L、(59.87±5.32)g/L比(58.36±5.25)g/L、(63.07±5.31)g/L比(61.72±4.66)g/L]及术后第1、3、5天白蛋白水平[(33.78±3.56)g/L比(33.41±3.71)g/L、(35.01±3.58)g/L比(34.43±3.14)g/L、(36.47±3.41)g/L比(35.83±2.80)g/L]差异均无统计学意义(均P>0.05)。结论与MLDG相比,SILDG+1美容效果明显,病人满意度高,且具有出血更少、腹壁创伤更小、术后恢复更快、炎症反应及疼痛程度更轻等优势。展开更多
文摘We present in this paper a wideband RF demodulator using a five-port correlator and a power detector for channel sounding applications. The demodulator has been fabricated using microstrip components. The correlator receives from the five-port qualities that allow it to be low-cost and less sensitive to the phase and amplitude imbalances. A calibration procedure is proposed to find the complex envelope of the RF signal applied at the input of the five-port correlator. Simulation with Advanced Design System software and measurement results have been conducted to demonstrate its capabilities as a RF signal demodulator operating in a wideband around 2.4 GHz frequency.
文摘目的探讨单孔加一孔腹腔镜技术在根治性远端胃癌手术中的可行性及优势。方法回顾性收集2019年9月至2021年9月期间于潍坊市人民医院胃肠外科行单孔加一孔腹腔镜远端胃癌根治术(single incision plus one port laparoscopic distal gastrectomy,SILDG+1)的44例病人的临床资料(SILDG+1组);收集同期由同一手术团队行传统五孔腹腔镜远端胃癌根治术(multi-port laparoscopy distal gastrectomy,MLDG)的48例病人作为对照(MLDG组),比较两组术后胃肠道功能、机体应激及炎性反应状态、美学效果。结果围手术期指标结果显示:SILDG+1组与MLDG组比较,手术时间长[(219.1±15.1)min比(196.3±23.0)min,P<0.001],出血量少[(96.7±14.8)mL比(105.3±18.1)mL,P=0.015],术后首次下床时间短[(31.14±5.84)h比(39.21±5.26)h,P<0.001],术后首次肛门排气时间短[(1.98±0.88)d比(2.44±0.99)d,P=0.021],术后住院时间短[(9.05±1.33)d比(10.08±1.88)d,P=0.003],差异均有统计学意义。两组病人在术后第1、2、3天视觉疼痛评分(单位:分,3.16±0.75比3.69±0.72、2.27±0.92比2.94±0.76、1.36±0.81比1.92±0.96),术后美学评分[(8.09±1.12)分比(6.02±1.19)分],术后第1、3、5天C反应蛋白水平[(37.27±14.19)mg/L比(45.72±19.14)mg/L、(71.42±26.04)mg/L比(87.51±40.21)mg/L、(30.93±19.67)mg/L比(40.81±22.35)mg/L],差异均具有统计学意义(均P<0.05),SILDG+1组优于MLDG组。两组病人术后并发症[3例(6.8%)比5例(10.4%),P=0.809]差异无统计学意义。术后第1、3、5天总蛋白水平[(55.87±5.51)g/L比(54.50±5.39)g/L、(59.87±5.32)g/L比(58.36±5.25)g/L、(63.07±5.31)g/L比(61.72±4.66)g/L]及术后第1、3、5天白蛋白水平[(33.78±3.56)g/L比(33.41±3.71)g/L、(35.01±3.58)g/L比(34.43±3.14)g/L、(36.47±3.41)g/L比(35.83±2.80)g/L]差异均无统计学意义(均P>0.05)。结论与MLDG相比,SILDG+1美容效果明显,病人满意度高,且具有出血更少、腹壁创伤更小、术后恢复更快、炎症反应及疼痛程度更轻等优势。
