This paper work aims to present the effect of the soil stiffness （k）, boundary conditions of piles and embedded length of piles （L） on a buckling force of a fully embedded pile and subject to an axial compression ...This paper work aims to present the effect of the soil stiffness （k）, boundary conditions of piles and embedded length of piles （L） on a buckling force of a fully embedded pile and subject to an axial compression force only, based on the finite difference method. Based on this method, MATLAB sottware is used to calculate the buckling forces of piles. Effect of the soil stiffness （k）, boundary conditions of piles and embedded length of piles （L） on a buckling force have been studied for reinforced concrete pile, whereas the modulus of horizontal subgrade reaction is adopted constantly with depth, increasing linearly with depth with zero value at the surface and increasing linearly with depth with nonzero value at the surface.展开更多
Leakages from subsea oil and gas equipment cause substantial economic losses and damage to marine ecosystem,so it is essential to locate the source of the leak.However,due to the complexity and variability of the mari...Leakages from subsea oil and gas equipment cause substantial economic losses and damage to marine ecosystem,so it is essential to locate the source of the leak.However,due to the complexity and variability of the marine environment,the signals collected by hydrophone contain a variety of noises,which makes it challenging to extract useful signals for localization.To solve this problem,a hydrophone denoising algorithm is proposed based on variational modal decomposition(VMD)with grey wolf optimization.First,the average envelope entropy is used as the fitness function of the grey wolf optimizer to find the optimal solution for the parameters K andα.Afterward,the VMD algorithm decomposes the original signal parameters to obtain the intrinsic mode functions(IMFs).Subsequently,the number of interrelationships between each IMF and the original signal was calculated,the threshold value was set,and the noise signal was removed to calculate the time difference using the valid signal obtained by reconstruction.Finally,the arrival time difference is used to locate the origin of the leak.The localization accuracy of the method in finding leaks is investigated experimentally by constructing a simulated leak test rig,and the effectiveness and feasibility of the method are verified.展开更多
目的:观察不同输血方式对高龄骨科手术患者术后转归的影响。方法:将90例择期骨科手术患者根据术中不同输血模式分为异体输血组(A组)和自体输血组(B组),自体+异体输血组(C组),每组各30例。患者全身麻醉后,桡动脉采血检测Hb、Hct值;观察...目的:观察不同输血方式对高龄骨科手术患者术后转归的影响。方法:将90例择期骨科手术患者根据术中不同输血模式分为异体输血组(A组)和自体输血组(B组),自体+异体输血组(C组),每组各30例。患者全身麻醉后,桡动脉采血检测Hb、Hct值;观察并记录术中失血量、异体输血量、自体输血量、尿量、手术时间及液体输入量;分别于术前、术后、术后1 d、3 d、5 d采集静脉血用流式细胞仪检测CD3^(+)、CD4^(+)及NK细胞百分比;术前1 d、术后1 d、3 d、7 d记录15项恢复质量量表(QoR-15)评分及术后住院时间。结果:C组出血量多于B组,差异有统计学意义(P<0.05);A组术后、术后1 d、3 d、5 d的CD3^(+)、CD4^(+)和NK细胞百分比均低于术前,差异有统计学意义(P<0.05),B组术后1 d、3 d、5 d CD3^(+)、CD4^(+)细胞百分比,C组术后3 d CD4^(+)细胞百分比,术后5 d CD3^(+)细胞百分比均高于A组,差异有统计学意义(P<0.05);B、C两组在术后1 d、3 d QoR-15评分均高于A组,差异有统计学意义(P<0.05),C组在术后1 d、3 d QoR-15评分均低于B组,差异有统计学意义(P<0.05);多因素回归显示B组术后住院时间低于A组,差异有统计学意义(P<0.05),C组术后住院时间与A组比较,差异无统计学意义(P=0.69)。结论:回收式自体输血(IOCS)应用于高龄骨科手术患者,相对于异体输血可有效促进患者术后转归,提高术后早期恢复质量,缩短术后住院时间。展开更多
为了保障桥梁结构正常运营,及时发现桥梁损伤,本文提出了多阶曲率模态差(multi order curvature mode difference,简称MOCMD)损伤指标进行桥梁结构损伤位置的识别。为了验证本文方法的有效性,通过数值模拟建立一简支梁桥有限元模型,研...为了保障桥梁结构正常运营,及时发现桥梁损伤,本文提出了多阶曲率模态差(multi order curvature mode difference,简称MOCMD)损伤指标进行桥梁结构损伤位置的识别。为了验证本文方法的有效性,通过数值模拟建立一简支梁桥有限元模型,研究不同损伤程度、损伤位置和噪声水平对该指标的影响。数值模拟结果表明,该指标能够精确识别多个工况损伤位置,而且具有一定抗噪性。展开更多
文摘This paper work aims to present the effect of the soil stiffness （k）, boundary conditions of piles and embedded length of piles （L） on a buckling force of a fully embedded pile and subject to an axial compression force only, based on the finite difference method. Based on this method, MATLAB sottware is used to calculate the buckling forces of piles. Effect of the soil stiffness （k）, boundary conditions of piles and embedded length of piles （L） on a buckling force have been studied for reinforced concrete pile, whereas the modulus of horizontal subgrade reaction is adopted constantly with depth, increasing linearly with depth with zero value at the surface and increasing linearly with depth with nonzero value at the surface.
基金financially supported by the National Key Research and Development Program of China(Grant No.2022YFC2806102)the National Natural Science Foundation of China(Grant Nos.52171287,52325107)+2 种基金High Tech Ship Research Project of Ministry of Industry and Information Technology(Grant Nos.2023GXB01-05-004-03,GXBZH2022-293)the Science Foundation for Distinguished Young Scholars of Shandong Province(Grant No.ZR2022JQ25)the Taishan Scholars Project(Grant No.tsqn201909063)。
文摘Leakages from subsea oil and gas equipment cause substantial economic losses and damage to marine ecosystem,so it is essential to locate the source of the leak.However,due to the complexity and variability of the marine environment,the signals collected by hydrophone contain a variety of noises,which makes it challenging to extract useful signals for localization.To solve this problem,a hydrophone denoising algorithm is proposed based on variational modal decomposition(VMD)with grey wolf optimization.First,the average envelope entropy is used as the fitness function of the grey wolf optimizer to find the optimal solution for the parameters K andα.Afterward,the VMD algorithm decomposes the original signal parameters to obtain the intrinsic mode functions(IMFs).Subsequently,the number of interrelationships between each IMF and the original signal was calculated,the threshold value was set,and the noise signal was removed to calculate the time difference using the valid signal obtained by reconstruction.Finally,the arrival time difference is used to locate the origin of the leak.The localization accuracy of the method in finding leaks is investigated experimentally by constructing a simulated leak test rig,and the effectiveness and feasibility of the method are verified.
文摘目的:观察不同输血方式对高龄骨科手术患者术后转归的影响。方法:将90例择期骨科手术患者根据术中不同输血模式分为异体输血组(A组)和自体输血组(B组),自体+异体输血组(C组),每组各30例。患者全身麻醉后,桡动脉采血检测Hb、Hct值;观察并记录术中失血量、异体输血量、自体输血量、尿量、手术时间及液体输入量;分别于术前、术后、术后1 d、3 d、5 d采集静脉血用流式细胞仪检测CD3^(+)、CD4^(+)及NK细胞百分比;术前1 d、术后1 d、3 d、7 d记录15项恢复质量量表(QoR-15)评分及术后住院时间。结果:C组出血量多于B组,差异有统计学意义(P<0.05);A组术后、术后1 d、3 d、5 d的CD3^(+)、CD4^(+)和NK细胞百分比均低于术前,差异有统计学意义(P<0.05),B组术后1 d、3 d、5 d CD3^(+)、CD4^(+)细胞百分比,C组术后3 d CD4^(+)细胞百分比,术后5 d CD3^(+)细胞百分比均高于A组,差异有统计学意义(P<0.05);B、C两组在术后1 d、3 d QoR-15评分均高于A组,差异有统计学意义(P<0.05),C组在术后1 d、3 d QoR-15评分均低于B组,差异有统计学意义(P<0.05);多因素回归显示B组术后住院时间低于A组,差异有统计学意义(P<0.05),C组术后住院时间与A组比较,差异无统计学意义(P=0.69)。结论:回收式自体输血(IOCS)应用于高龄骨科手术患者,相对于异体输血可有效促进患者术后转归,提高术后早期恢复质量,缩短术后住院时间。
文摘为了保障桥梁结构正常运营,及时发现桥梁损伤,本文提出了多阶曲率模态差(multi order curvature mode difference,简称MOCMD)损伤指标进行桥梁结构损伤位置的识别。为了验证本文方法的有效性,通过数值模拟建立一简支梁桥有限元模型,研究不同损伤程度、损伤位置和噪声水平对该指标的影响。数值模拟结果表明,该指标能够精确识别多个工况损伤位置,而且具有一定抗噪性。
