目的:比较腹腔镜胰十二指肠切除术(LPD)与开腹胰十二指肠切除术(OPD)的临床疗效。方法:回顾性收集新疆医科大学第一附属医院2015年1月至2021年1月期间完成的33例腹腔镜胰十二指肠切除术患者及33例开腹胰十二指肠切除术患者资料。比较两...目的:比较腹腔镜胰十二指肠切除术(LPD)与开腹胰十二指肠切除术(OPD)的临床疗效。方法:回顾性收集新疆医科大学第一附属医院2015年1月至2021年1月期间完成的33例腹腔镜胰十二指肠切除术患者及33例开腹胰十二指肠切除术患者资料。比较两组手术时间,术中出血量,术中输血情况,术后排气时间,术后首次下床时间,术后住院天数,带管时间,住院总费用及术后并发症发生情况。结果:两组手术出血量,住院总费用无统计学差异(P > 0.05),手术时间LPD组大于OPD组(P 0.05)。结论:开腹和腹腔镜胰十二指肠切除术均安全有效,腹腔镜胰十二指肠切除术在不增加并发症的情况下,术后恢复优于开腹腹腔镜胰十二指肠切除术。Objective: To compare the clinical effects of laparoscopic pancreaticoduodenectomy (LPD) and open pancreaticoduodenectomy (OPD). Methods: The data of 33 patients with laparoscopic pancreaticoduodenectomy and 33 patients with open pancreaticoduodenectomy completed in the First Affiliated Hospital of Xinjiang Medical University from January 2015 to January 2021 were collected retrospectively. The operation time, intraoperative bleeding, intraoperative blood transfusion, postoperative exhaust time, the first time out of bed, postoperative hospital stay, tube time, total hospitalization cost and postoperative complications were compared between the two groups. Results: There was no significant difference in the amount of surgical bleeding and the total cost of hospitalization between the two groups (P > 0.05). The operation time in group LPD was greater than that in group OPD (P 0.05). Conclusion: Both open and laparoscopic pancreatoduodenectomy are safe and effective, and laparoscopic pancreatoduodenectomy offers better postoperative recovery than open and laparoscopic pancreatoduodenectomy without increasing complications.展开更多
This article presents the optical evaluation of the vibrational behavior of a steel bar,by a non-conventional optoacoustic procedure,the LPD(laser photo deflection)method.On this occasion the bar is located horizontal...This article presents the optical evaluation of the vibrational behavior of a steel bar,by a non-conventional optoacoustic procedure,the LPD(laser photo deflection)method.On this occasion the bar is located horizontal and fixed at both ends.Through our procedure we experimentally find the first 9 Eigen frequencies(21 Hz,60 Hz,116 Hz...)and correlate them using the cantilever theory.展开更多
In this work,we present the results of the optical evaluation of resonance vibrations in a conventional roof.On this occasion,we took advantage of having an ordinary booth near the laboratory,making it easier for us t...In this work,we present the results of the optical evaluation of resonance vibrations in a conventional roof.On this occasion,we took advantage of having an ordinary booth near the laboratory,making it easier for us to conduct this evaluation.The roof in question has a square geometry and is apparently made of concrete.Following our usual LPD(laser photo deflection)procedure,of exciting the vibrations of the structure through sound and detecting the response optically,we obtain by resonance the first 6 roof’s Eigen oscillations,the same ones that are identified as Modes(1,1),(1,2),(2,2),(1,3),(2,3)and(3,3).The occurrence of these modes in this work is justified in a first approximation through the classical acoustic resonator theory.展开更多
针对Chirp基调制信号在分数阶傅里叶变换域特征明显,信号周期易被检测等问题,提出一种能够实现多域隐蔽的低检测概率(low probability of detection,LPD)波形构造方法。该方法采用分数阶傅里叶变换跳频(fractional Fourier transform-fr...针对Chirp基调制信号在分数阶傅里叶变换域特征明显,信号周期易被检测等问题,提出一种能够实现多域隐蔽的低检测概率(low probability of detection,LPD)波形构造方法。该方法采用分数阶傅里叶变换跳频(fractional Fourier transform-frequency hopping,FrFT-FH)架构,在不改变Chirp信号扩频增益的前提下,通过时宽分割和重组(time width division and reorganization,TDR),降低信号在分数阶傅里叶变换域和周期域的能量聚敛特性。仿真结果表明,相较于现有LPD波形只能实现单一特征域隐蔽的问题,所提波形在不影响系统通信性能的前提下,面对频域检测、分数阶傅里叶变换域检测、周期域检测多种检测手段,在10 dB信噪比条件下的信号检测概率均低于0.2,满足系统在不同特征域下的LPD需求。展开更多
文摘目的:比较腹腔镜胰十二指肠切除术(LPD)与开腹胰十二指肠切除术(OPD)的临床疗效。方法:回顾性收集新疆医科大学第一附属医院2015年1月至2021年1月期间完成的33例腹腔镜胰十二指肠切除术患者及33例开腹胰十二指肠切除术患者资料。比较两组手术时间,术中出血量,术中输血情况,术后排气时间,术后首次下床时间,术后住院天数,带管时间,住院总费用及术后并发症发生情况。结果:两组手术出血量,住院总费用无统计学差异(P > 0.05),手术时间LPD组大于OPD组(P 0.05)。结论:开腹和腹腔镜胰十二指肠切除术均安全有效,腹腔镜胰十二指肠切除术在不增加并发症的情况下,术后恢复优于开腹腹腔镜胰十二指肠切除术。Objective: To compare the clinical effects of laparoscopic pancreaticoduodenectomy (LPD) and open pancreaticoduodenectomy (OPD). Methods: The data of 33 patients with laparoscopic pancreaticoduodenectomy and 33 patients with open pancreaticoduodenectomy completed in the First Affiliated Hospital of Xinjiang Medical University from January 2015 to January 2021 were collected retrospectively. The operation time, intraoperative bleeding, intraoperative blood transfusion, postoperative exhaust time, the first time out of bed, postoperative hospital stay, tube time, total hospitalization cost and postoperative complications were compared between the two groups. Results: There was no significant difference in the amount of surgical bleeding and the total cost of hospitalization between the two groups (P > 0.05). The operation time in group LPD was greater than that in group OPD (P 0.05). Conclusion: Both open and laparoscopic pancreatoduodenectomy are safe and effective, and laparoscopic pancreatoduodenectomy offers better postoperative recovery than open and laparoscopic pancreatoduodenectomy without increasing complications.
文摘This article presents the optical evaluation of the vibrational behavior of a steel bar,by a non-conventional optoacoustic procedure,the LPD(laser photo deflection)method.On this occasion the bar is located horizontal and fixed at both ends.Through our procedure we experimentally find the first 9 Eigen frequencies(21 Hz,60 Hz,116 Hz...)and correlate them using the cantilever theory.
文摘In this work,we present the results of the optical evaluation of resonance vibrations in a conventional roof.On this occasion,we took advantage of having an ordinary booth near the laboratory,making it easier for us to conduct this evaluation.The roof in question has a square geometry and is apparently made of concrete.Following our usual LPD(laser photo deflection)procedure,of exciting the vibrations of the structure through sound and detecting the response optically,we obtain by resonance the first 6 roof’s Eigen oscillations,the same ones that are identified as Modes(1,1),(1,2),(2,2),(1,3),(2,3)and(3,3).The occurrence of these modes in this work is justified in a first approximation through the classical acoustic resonator theory.
文摘针对Chirp基调制信号在分数阶傅里叶变换域特征明显,信号周期易被检测等问题,提出一种能够实现多域隐蔽的低检测概率(low probability of detection,LPD)波形构造方法。该方法采用分数阶傅里叶变换跳频(fractional Fourier transform-frequency hopping,FrFT-FH)架构,在不改变Chirp信号扩频增益的前提下,通过时宽分割和重组(time width division and reorganization,TDR),降低信号在分数阶傅里叶变换域和周期域的能量聚敛特性。仿真结果表明,相较于现有LPD波形只能实现单一特征域隐蔽的问题,所提波形在不影响系统通信性能的前提下,面对频域检测、分数阶傅里叶变换域检测、周期域检测多种检测手段,在10 dB信噪比条件下的信号检测概率均低于0.2,满足系统在不同特征域下的LPD需求。
