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空气加压法在腹腔镜腹壁嵌顿疝修补术中的疗效分析

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腹腔镜外科杂志 2024年第7期29卷 513-516页

作者：徐晗邢园园郭明晓高鹰山东第二医科大学临床医学院山东临沂276000 山东第二医科大学附属临沂市人民医院临沂市人民医院胃肠外科

目的:探讨空气加压法在腹腔镜腹壁嵌顿疝修补术中的临床疗效。方法:回顾分析2020年6月至2022年6月收治的16例腹壁嵌顿疝患者的临床资料,其中腹壁疝8例(侧腹壁切口疝4例,中线切口疝2例,造口旁疝2例),脐疝8例。在空气加压法辅助下行腹腔... 详细信息

目的:探讨空气加压法在腹腔镜腹壁嵌顿疝修补术中的临床疗效。方法:回顾分析2020年6月至2022年6月收治的16例腹壁嵌顿疝患者的临床资料,其中腹壁疝8例(侧腹壁切口疝4例,中线切口疝2例,造口旁疝2例),脐疝8例。在空气加压法辅助下行腹腔镜手术,分析手术时间、术中疝大小与还纳情况、术后排气时间、住院时间、并发症等相关指标。结果:16例患者均在空气加压法辅助下顺利完成嵌顿疝的还纳与修补。手术时间85~220 min,平均(154.70±39.06)min,还纳疝内容物时间(18.35±4.98)min,疝环口直径3~10 cm。16例患者均伴有小肠嵌顿,5例肠管坏死中转开腹,行小肠切除术;术中发现隐匿性缺损2例。术后排气时间1~5 d,平均(3.00±1.08)d;术后疼痛评分(3.56±4.01)分,予以对症治疗后疼痛缓解。术后住院3~10 d,平均(6.27±1.93)d。随访8~32个月,中位随访时间24个月,均未出现切口感染、肠梗阻、补片感染、复发等并发症。结论:熟练掌握腹腔镜疝修补术技巧,严格掌握手术适应证,空气加压法辅助腹腔镜手术治疗腹壁嵌顿疝是安全、可行的,值得推广。

关键词：嵌顿疝腹腔镜检查空气加压治疗结果

Effects of UV on the Corrosion Behavior of Pure Aluminum 1060 in Simulated Nansha Marine Atmosphere

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Acta Metallurgica Sinica(English Letters) 2022年第7期35卷 1207-1220页

作者： Can Peng mingxiao guo Tianzhen Gu Xiaohan Li Chuan Wang Zhenyao Wang Cheng Sun School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China Liaoning Shenyang Soil and Atmosphere Corrosion of Material National Observation and Research Station Shenyang 110016China

The corrosion behavior of pure aluminum 1060 subjected to a wet-dry cyclic accelerated test in simulated Nansha marine atmosphere in the dark and under UV illumination has been investigated by means of scanning electron microscopy(SEM),electrochemical impedance spectroscopy(EIS),and Mott–Schottky measurements in this *** results show that under the two conditions,the native oxide films are constantly destroyed and the thicknesses of the oxide films continuously decrease in the first 24 days of the corrosion *** particular,UV illumination can diminish the pitting corrosion susceptibility of the native oxide films to an extent in terms of a photo-induced modifi cation of the native oxide film on the pure aluminum ***,UV illumination can also reduce the carrier concentration in the oxide films,thus reducing the conductivity and the corrosion rate.

关键词： Aluminum Atmospheric corrosion UV illumination Electrochemical impedance spectroscopy

Transformer-Aided Deep Double Dueling Spatial-Temporal Q-Network for Spatial Crowdsourcing Analysis

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Computer Modeling in Engineering & Sciences 2024年第4期139卷 893-909页

作者： Yu Li mingxiao Li Dongyang Ou Junjie guo Fangyuan Pan Department of Computing Hangzhou Dianzi UniversityHangzhou310018China

With the rapid development ofmobile Internet,spatial crowdsourcing has becomemore andmore *** crowdsourcing consists of many different types of applications,such as spatial crowd-sensing *** terms of spatial crowd-sensing,it collects and analyzes traffic sensing data from clients like vehicles and traffic lights to construct intelligent traffic prediction *** collecting sensing data,spatial crowdsourcing also includes spatial delivery services like DiDi and *** task assignment and worker selection dominate the service quality for spatial crowdsourcing *** research conducted task assignments via traditional matching approaches or using simple network ***,advanced mining methods are lacking to explore the relationship between workers,task publishers,and the spatio-temporal attributes in ***,in this paper,we propose a Deep Double Dueling Spatial-temporal Q Network(D3SQN)to adaptively learn the spatialtemporal relationship between task,task publishers,and workers in a dynamic environment to achieve optimal ***,D3SQNis revised through reinforcement learning by adding a spatial-temporal transformer that can estimate the expected state values and action advantages so as to improve the accuracy of task *** experiments are conducted over real data collected fromDiDi and ELM,and the simulation results verify the effectiveness of our proposed models.

关键词： Historical behavior analysis spatial crowdsourcing deep double dueling Q-networks

Microstructure and Mechanical Properties of Ti–Ta Composites Prepared Through Cold Spray Additive Manufacturing

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Acta Metallurgica Sinica(English Letters) 2022年第9期35卷 1465-1476页

作者： Junrong Tang Naeem ul Haq Tariq Zhipo Zhao mingxiao guo Hanhui Liu Yupeng Ren Xinyu Cui Yanfang Shen Jiqiang Wang Tianying Xiong Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China Department of Metallurgy and Materials Engineering Pakistan Institute of Engineering and Applied SciencesNiloreIslamabadPakistan

In this study, an innovative approach was used to fabricate Ti–Ta composite biomaterials through cold spray additive manufacturing followed by a diff usion treatment. The microstructure and mechanical properties of the composites were investigated in detail using field emission scanning electron microscopy, electron backscatter diff raction, 3D X-ray computed tomography, tensile test, nanohardness test and resonance vibration test. The obtained results indicated that the prepared composites have inhomogeneity in their microstructure and composition. A unique microstructure, composed of Ti-rich, Ta-rich and diff usion regions, was evolved in the composites due to incomplete diff usion between Ti and Ta splats. Further, Kirkendall pores were formed in the composites due to uneven diff usion of the two phases(of Ti and Ta) during high-temperature heat treatment. The prepared composites simultaneously showed low elastic modulus and high tensile strength which is required for a good biomaterial. Low elastic modulus was associated with the residual pores and the alloying eff ect of Ta in Ti, while high tensile strength was related to the solid solution strengthening eff ects. The obtained results indicated that the prepared Ti–Ta composites have a great potential to become a new candidate for biomedical applications.

关键词： Ti–Ta composites Cold spray additive manufacturing(CSAM) Biomaterials Mechanical properties X-ray computed tomography(XCT)

Corrosion Behavior of 304 Stainless Steel Exposed to a Simulated Salt Lake Atmosphere

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Acta Metallurgica Sinica(English Letters) 2020年第6期33卷 857-870页

作者： mingxiao guo Qi Yin Miaoran Liu Chen Pan Zhenyao Wang Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China University of Chinese Academy of Sciences Beijing 100049China

The corrosion behavior of stainless steel exposed to a simulated salt lake atmosphere has been investigated by analyzing the evolution of surface morphologies and corrosion products, the initiation and development of pits, and the electrochemical characteristics. The results indicated that(Mg6Fe2(OH)16(CO3)(H2O)4.5)0.25, a layered double hydroxide, has been detected for the first time in the corrosion products formed on stainless steel exposed to a simulated salt lake atmosphere. The specimens exposed to MgCl2 deposit conditions were corroded more severely than those exposed to NaCl deposit conditions, which was attributed to the differences in the deliquescence relative humidity and efflorescence relative humidity values of MgCl2 and NaCl. In addition, a special corrosion morphology consisting of a concentric circle of yellowish material was observed on the specimens exposed to MgCl2 deposit conditions, which was attributed to the formation of Mg(OH)2, inhibiting the diffusion and migration of OH- ions to the anode region. The maximum pit depth followed a power function with respect to corrosion time. The corrosion mechanism of stainless steel exposed to a simulated salt lake atmosphere is also discussed.

关键词： Atmospheric corrosion Stainless steel Salt lake atmosphere Pitting corrosion

Corrosion Behavior of 316L Stainless Steels Exposed to Salt Lake Atmosphere of Western China for 8 years

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Acta Metallurgica Sinica(English Letters) 2021年第4期34卷 555-564页

作者： mingxiao guo Junrong Tang Tianzhen Gu Can Peng Qiaoxia Li Chen Pan Zhenyao Wang Institute of Metal Research Chinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China University of Chinese Academy of Sciences Beijing100049China

The evolution of corrosion behavior of 316 L stainless steels exposed to salt lake atmosphere for 8 years was *** results showed that the stainless steel in salt lake atmosphere had a greater corrosion rate during the initial exposure time and relatively lower corrosion rate during the subsequent exposure *** depositions accumulated on the downward surface caused severe local corrosion of stainless *** exposure time prolonged,the relative amount of Croxide and Feoxidein the corrosion products gradually increased,which may directly affect the corrosion rate of stainless ***,the maximum pit depth followed a power function with respect to exposure time.

关键词： Atmospheric corrosion Salt lake atmosphere Stainless steel X-ray photoelectron spectroscopy(XPS) Electrochemical impedance spectroscopy(EIS)

低碳钢Q235、管线钢L415和压力容器钢16MnNi在湛江高湿高辐照海洋工业大气环境下的初期腐蚀行为

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金属学报 2023年第7期59卷 884-892页

作者：李小涵曹公望郭明晓彭云超马凯军王振尧中国科学技术大学材料科学与工程学院沈阳110016 中国科学院金属研究所沈阳110016 国家管网集团东部原油储运有限公司徐州221008

通过失重分析、腐蚀形貌观察、腐蚀产物分析和电化学测试等方法,对油库常用金属材料低碳钢Q235、管线钢L415和压力容器钢16MnNi暴露在湛江实际真实大气环境中180 d的初期腐蚀行为进行研究。结果表明,大气中的Cl^(-)、SO_(2)和紫外辐照... 详细信息

通过失重分析、腐蚀形貌观察、腐蚀产物分析和电化学测试等方法,对油库常用金属材料低碳钢Q235、管线钢L415和压力容器钢16MnNi暴露在湛江实际真实大气环境中180 d的初期腐蚀行为进行研究。结果表明,大气中的Cl^(-)、SO_(2)和紫外辐照的协同作用加剧了油库常用材料的腐蚀。锈层成分显著影响钢材的腐蚀过程,在此环境下,3种材料服役相同时间时,发生的腐蚀差异主要是由于腐蚀产物的种类和含量造成的。由于低碳钢Q235锈层中含有较多的β-FeOOH、γ-FeOOH和Fe_(3)O_(4),导致其较高的腐蚀速率。

关键词：大气腐蚀腐蚀产物低碳钢Q235 管线钢L415 压力容器钢16MnNi

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土石坝非稳定渗流场特性研究

水利科学与寒区工程 2023年第5期6卷 38-41页

作者：郭明晓浙江省围海建设集团舟山有限公司浙江舟山316000

采用数值模拟方法分析了土石坝在渗透系数为1×10-5 cm/s工况下,坝体的非稳定渗流规律和变形特性。结果表明:土石坝渗流发生时,坝体内部的水压面积分布增大,浸润线的位置升高;随着水库水位升高,土石坝上游侧的变形随时间增大而减小,下... 详细信息

采用数值模拟方法分析了土石坝在渗透系数为1×10-5 cm/s工况下,坝体的非稳定渗流规律和变形特性。结果表明:土石坝渗流发生时,坝体内部的水压面积分布增大,浸润线的位置升高;随着水库水位升高,土石坝上游侧的变形随时间增大而减小,下游侧坝体变形随时间增大而增大。坝体内部最大和最小主应力逐渐减小。研究结果可为土石坝的设计及防渗加固提供参考。

关键词：土石坝非稳定渗流渗流场特性数值模拟

体外膜肺氧合支持对猪控制型心死亡模型供体小肠移植术后早期肠功能的影响

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中华解剖与临床杂志 2022年第4期27卷 273-280页

作者：郭明晓高鹰路春雷李幼生临沂市人民医院普外科临沂276000 上海交通大学附属第九人民医院普外科上海200011

目的探讨体外膜肺氧合(ECMO)技术对控制型心死亡模型猪供体小肠移植后早期肠道功能的影响。方法选取体质量22~25 kg白色杂种猪48只,按数字表法随机分为正常对照组(LD组)、心死亡供体组(DCD组)、ECMO支持1 h组(E1组)和ECMO支持3 h组(E3组... 详细信息

目的探讨体外膜肺氧合(ECMO)技术对控制型心死亡模型猪供体小肠移植后早期肠道功能的影响。方法选取体质量22~25 kg白色杂种猪48只,按数字表法随机分为正常对照组(LD组)、心死亡供体组(DCD组)、ECMO支持1 h组(E1组)和ECMO支持3 h组(E3组)共4组,每组12只;每组再随机分为供体组和受体组2个亚组,每个亚组各6只。LD组的供体亚组常规截取移植用小肠;DCD组的供体亚组先建立DCD模型,然后截取移植用小肠;E1、E3组的供体亚组,先建立DCD模型,再分别采用ECMO支持1、3 h后,截取移植用小肠。各受体亚组行小肠移植手术。分别于肠移植前、移植后再灌注1 h及移植后第1、3、5、7天经移植肠造口活检钳切取各受体亚组移植肠组织制备病理切片,采用Park/Chiu评分系统评估肠组织损伤程度,透射电镜下观察移植术后第7天小肠黏膜超微结构,免疫组织化学染色观察移植术后再灌注1 h时肠黏膜细胞凋亡因子caspase-3表达水平。分别于移植前和移植术后第1、3、5、7天采集各受体亚组猪颈外静脉血,检测血清D-乳酸水平评估肠黏膜受损情况及肠道通透性;移植术后第7天检测血浆D-木糖最大浓度评估移植肠吸收能力。结果(1)各受体亚组组织病理学评分:小肠移植术前,各组移植肠均有肠黏膜损伤,其中E3组肠黏膜损伤最重,肠黏膜损伤程度Park/Chiu评分E3组高于LD组、DCD组及E1组,差异均有统计学意义(P值均0.05)。小肠移植术后再灌注1 h和术后第1天时,DCD组Park/Chiu评分最高,明显高于LD组、E1组、E3组,差异均有统计学差异(P值均0.05)。术后第3、5、7天,LD组、DCD组、E1组、E3组Park/Chiu评分差异均无统计学意义(P值均>0.05)。(2)各受体亚组肠黏膜超微结构:术后第7天各组移植肠超微结构示基本恢复正常,LD组与E1组、E3组紧密连接结构与微绒毛改变无明显差异,而DCD组紧密连接结构相对较短、间隙较大。(3)各受体亚组肠黏膜细胞凋亡因子caspase-3表达水平:小肠移植术后再灌注1 h时,DCD组、E3组caspase-3相对表达水平分别高于LD组和E1组,差异均有统计学意义(P值均0.05)。(4)各受体亚组血浆D-乳酸水平:术后第1天和第3天,DCD组、E3组血浆D-乳酸水平分别高于LD组和E1组,差异均有统计学意义(P值均0.05)。术后第5、7天,DCD组血浆D-乳酸水平高于LD组、E1组及E3组,差异均有统计学意义(P值均0.05)。(5)各受体亚组移植肠吸收功能:肠移植术后第7天各组血浆D-木糖最大浓度由高至低依次为LD组、E1组、E3组和DCD组,4组间的比较,差异均有统计学意义(P值均<0.05)。结论ECMO支持1 h可改善移植后早期移植肠吸收功能,减轻移植肠缺血再灌注损伤;降低再灌注时移植肠黏膜caspase-3蛋白表达、减少细胞凋亡可能是其保护机制之一。

关键词：器官移植小肠控制型心死亡供体体外膜肺氧合猪模型动物