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In-situ microstructural evolutions of 5Mn steel at elevated temperature in a transmission electron microscope

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Journal of Iron and Steel Research International 2017年第11期24卷 1109-1114页

作者： han-bo jiang Xi-nan Luo Xiao-yan Zhong Hui-hua Zhou Cun-yu Wang Jie Shi han Dong National Center for Electron Microscopy in Beijing Key Laboratory of Advanced Materials(MOE)State Key Laboratory of New Ceramics and Fine ProcessingSchool of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Central Iron and Steel Research Institute Beijing 100081China

The microstructural evolutions of 5Mn steel during various heat treatments have been investiga- ted by in-situ transmission electron microscopy （TEM）. The specimen of 5Mn steel was pre- pared using focused ion beam （FIB） milling, which allowed the selection of specific morphology of interest prior to the in-situ observation, The complete austenization at 800 ℃ was verified at the atomic scale by minimizing thermal expansion and sample drift in a heating holder based on micro-electro-mechanical-systems. During annealing at 650 ℃, the formation of reverted austen- ite was dynamically observed, while the morphologies of austenite laths of 5Mn steel after in-situ heating were quite similar to that after ex-situ intereritical annealing. During annealing at 500 ℃, the morphological evolution of cementite and associated Mn diffusion were investigated. It was demonstrated that a combination of FIB sampling and high temperature in-situ TEM enables us to probe the morphological evolution and elemental diffusion of specific areas of interest in steel at high spatial resolution.

关键词： 5Mn steel Focused ion beam milling In-situ observation Microstructural evolution Austenite Cementite

腹腔镜完全腹膜外疝修补术治疗腹股沟疝的疗效及对炎症介质、氧化应激、疼痛介质的影响

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临床和实验医学杂志 2024年第4期23卷 405-409页

作者：张霞韩江博濮苗江春霞常绪生海军军医大学第一附属医院胃肠外科上海200433

目的分析腹腔镜完全腹膜外疝修补术(TEP)治疗腹股沟疝的疗效及对炎症介质、氧化应激、疼痛介质的影响。方法前瞻性选取2020年7月至2023年6月于海军军医大学第一附属医院行手术治疗的腹股沟疝患者100例作为研究对象,依据随机数字表法将... 详细信息

目的分析腹腔镜完全腹膜外疝修补术(TEP)治疗腹股沟疝的疗效及对炎症介质、氧化应激、疼痛介质的影响。方法前瞻性选取2020年7月至2023年6月于海军军医大学第一附属医院行手术治疗的腹股沟疝患者100例作为研究对象,依据随机数字表法将其分为开放组(n=50)与TEP组(n=50)。开放组行开放疝修补术,TEP组行TEP。比较两组的临床疗效,观察两组术中出血量、手术时间、术后下地时间、术后住院时间及胃肠功能恢复时间等围手术期指标。观察并比较两组手术后1 d血清炎症介质[肿瘤坏死因子-ɑ(TNF-ɑ)、白细胞介素(IL)-6、IL-1β]、氧化应激介质[人类软骨糖蛋白(YKL-40)、超氧化物歧化酶(SOD)、还原型谷胱甘肽过氧化物酶(GSH-Px)]、疼痛介质[β-内啡肽(β-EP)、P物质、5-羟色胺]水平,以及术后并发症发生情况。结果TEP组总有效率为94.00%,高于开放组(76.00%),差异有统计学意义(P<0.05)。TEP组术中出血量、下地时间、术后住院时间、胃肠功能恢复时间为(14.28±1.70)mL、(14.62±1.68)h、(4.38±0.46)d、(14.76±1.72)d,均低(短)于开放组[(23.96±2.63)mL、(18.29±2.15)h、(7.64±0.79)d、(16.89±1.91)d],手术时间为(70.18±7.32)min,长于开放组[(53.86±5.64)min],差异均有统计学意义(P<0.05)。手术后1 d,TEP组的血清TNF-ɑ、IL-6、IL-1β、YKL-40、P物质、5-羟色胺水平分别为[(1.93±0.20)ng/mL、(4.67±0.49)pg/mL、(2.63±0.29)pg/mL、(124.64±14.08)pg/mL、(89.96±9.24)pg/mL、(229.75±24.69)nmol/L],均低于开放组[(2.87±0.31)ng/mL、(6.14±0.64)pg/mL、(3.89±0.40)pg/mL、(158.93±18.94)pg/mL、(106.83±12.09)pg/mL、(297.68±31.71)nmol/L],血清SOD、GSH-Px、β-EP水平分别为(122.97±14.86)U/mL、(2.25±0.24)U/mL、(104.65±12.94)ng/mL,均高于开放组[(103.75±12.93)U/mL、(1.67±0.18)U/mL、(81.09±8.32)ng/mL],差异均有统计学意义(P<0.05)。TEP组术后总并发症率为4.00%,低于开放组18.00%(P<0.05)。结论TEP治疗腹股沟疝具有创伤小,术后恢复快,并发症少,对炎症介质、氧化应激、疼痛介质的影响小的优点,优于开放手术。

关键词：腹股沟疝腹腔镜完全腹膜外疝修补术炎症介质氧化应激疼痛介质

全髋置换假体松动局部组织表现与CXCL16的表达

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中国矫形外科杂志 2024年第4期32卷 362-367页

作者：祝朗峰乔永杰宋晓阳李培杰李嘉欢韩江博周胜虎宁夏医科大学宁夏银川750004 中国人民解放军联勤保障部队第九四〇医院关节外科甘肃兰州730050 西安市长安区医院陕西西安710125

[目的]探讨全髋关节置换术后无菌性松动与局部组织表现和CXCL16的表达水平相关性。[方法]2017年6月—2023年6月44例无菌性假体松动行翻修的患者为翻修组,44例同期于本院行初次全髋关节置换术的患者为初次组。术中取关节滑膜组织行组织... 详细信息

[目的]探讨全髋关节置换术后无菌性松动与局部组织表现和CXCL16的表达水平相关性。[方法]2017年6月—2023年6月44例无菌性假体松动行翻修的患者为翻修组,44例同期于本院行初次全髋关节置换术的患者为初次组。术中取关节滑膜组织行组织学评分和CXCL16检测,比较不同临床状态的组织学检测指标,并分析它们之间的相关性。[结果]翻修组假体界膜组织中有较多多核巨细胞浸润,翻修组的组织学评分显著高于初次组[(5.9±1.8)vs(0.6±0.8),P<0.001]。免疫组化染色结果显示,翻修组CXCL16的蛋白表达阳性率显著高于初次组(86.4%vs 6.8%,P<0.001)。44例翻修患者按临床特征分层比较表明,不同假体类型之间组织学评分的差异有统计学意义(P<0.05);不同假体类型、假体生存期之间CXCL16表达水平的差异有统计学意义(P<0.05)。相关性分析结果显示,组织学评分与假体生存期存在显著正相关(r=0.383,P=0.010),CXCL16表达分级与假体生存期(r=0.350,P=0.020)呈显著正相关,与翻修前Harris评分(r=-0.345,P=0.022)呈显著负相关。[结论]全髋置换术后无菌性松动患者假体界膜组织中CXCL16的表达水平显著高于初次组,该因子有可能参与了无菌性松动的发病过程。

关键词：全髋关节置换术无菌性松动假体材料组织学检查 CXCL16

A Review of Magnesium Alloys as Structure–Function Integrated Materials

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Acta Metallurgica Sinica(English Letters) 2024年第8期37卷 1301-1338页

作者： Zhenfei jiang bo Hu Zixin Li Fanjin Yao Jiaxuan han Dejiang Li Xiaoqin Zeng Wenjiang Ding National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240China

Magnesium alloys have a significant advantage,lower density over the other structure materials;hence,they have been widely used in various fields such as transportation and *** the development of research and the enlargement of the research scope,more advantages have been revealed:excellent shielding efficiency,extraordinarily high damping capacity,as well as impressive thermal ***,Mg alloys have the potential to be various functional materials,such as electromagnetic shielding material,damping material,and thermal conductive *** review comprehensively summarizes the research progress and the up-to-date summary of Mg alloys as structure–function integrated materials in recent *** atoms,heat treatment,deformation,secondary phase,and temperature,which have a significant influence on the properties of magnesium alloys,are *** expect this review to be helpful for those who are working on developing structure–function integrated materials with superior comprehensive performance.

关键词： Magnesium alloys Structure-function integrated Electromagnetic shielding Damping capacity Thermal conductivity

CO_(2) capture by modified clinoptilolite and its regeneration performance

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International Journal of Coal Science & Technology 2024年第2期11卷 81-90页

作者： bo jiang bo Zhang Xuqin Duan Yi Xing School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants University of Science and Technology BeijingBeijing 100083China YangQuan Coal Industry(Group)Co.Ltd. Yangquan 045000China School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China

This study focuses on CO_(2) capture by pressure swing adsorption(PSA),with modified clinoptilolite as the *** clinoptilolite is modified by roasting,by acid pickling,by a combination of acid pickling and roasting,and by ion *** by acid pickling-roasting and by ion exchange are found to give the highest CO_(2) adsorption capacities,of 730 mL/g and 876.7 mL/g,*** is found that regeneration of clinoptilolite by a combination of vacuum desorption and heating enables recovery of as much as 89%of its previous CO_(2) adsorption *** examine the CO_(2) adsorption capacity of clinoptilolite when applied to mixed gas,a simulated coking exhaust containing 12%CO_(2) and 4%O_(2) is used,and it is found that ion exchange modified clinoptilolite achieves a CO_(2) removal efficiency of 92.5%.A BET test reveals that acid pickling-roasting and Na^(+) modification enhance the porosity of clinoptilolite,thereby improving its adsorption *** work demonstrates the feasibility of applying modified clinoptilolite as an effective adsorbent for COO_(2)capture,providing a promising tool for dealing with greenhouse gases.

关键词： Clinoptilolite Carbon dioxide capture Pressure swing adsorption(PSA)

General formalism for dirty extreme-mass-ratio inspirals

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Science China(Physics,Mechanics & Astronomy) 2024年第7期67卷 22-29页

作者： Ye jiang Wen-Biao han Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou 310024China Shanghai Frontiers Science Center for Gravitational Wave Detection Shanghai 200240China

Detecting the environment around the supermassive black holes and tests of general relativity are important applications of extreme-mass-ratio inspirals(EMRIs).There is still a challenge to efficiently describe various“dirty”impacts on the inspirals,such as dark matter,gas,dipole radiation,and electromagnetic *** this study,we find the inherent linearity of the asymptotic solution of the inhomogeneous Teukolsky *** the basis of this property,we completely decouple the factors of the perturber and the background spacetime in the energy fluxes and *** the new decoupling form,the waveforms of EMRIs with non-geodesic motion in Kerr spacetime can be conveniently *** will help to resolve the environment(including gas,field,dark matter,electromagnetic interaction)around supermassive black holes and test general relativity.

关键词： gravitational wave Teukolsky equation extreme-mass-ratio inspirals

Study on 6-DOF active vibration-isolation system of the ultra-precision turning lathe based on GA-BP-PID control for dynamic loads

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Advances in Manufacturing 2024年第1期12卷 33-60页

作者： bo Wang Zhong jiang Pei-Da Hu Department of Precision Instrument Tsinghua UniversityBeijing100084People’s Republic of China Institute of Machinery Manufacturing Technology China Academy of Engineering PhysicsMianyang621900SichuanPeople’s Republic of China

The vibration disturbance from an external environment affects the machining accuracy of ultra-precision machining *** active vibration-isolation systems(AVIS)have been developed based on static *** a vibration-isolation load changes dynamically during ultra-precision turning lathe machining,the system parameters change,and the efficiency of the active vibration-isolation system based on the traditional control strategy *** solve this problem,this paper proposes a vibration-isolation control strategy based on a genetic algorithm-back propagation neural network-PID control(GA-BP-PID),which can automatically adjust the control parameters according to the machining ***-isolation simulations and experiments based on passive vibration isolation,a PID algorithm,and the GA-BP-PID algorithm under dynamic load machining conditions were *** experimental results demonstrated that the active vibration-isolation control strategy designed in this study could effectively attenuate vibration disturbances in the external environment under dynamic load *** design is reasonable and feasible.

关键词： Ultra-precision diamond turning lathe Active vibration isolation Six degrees of freedom Dynamic load Genetic algorithm-back propagation neural network-PID(GA-BP-PID)control

EMCO-based Optimal Layout Design of Hybrid Wind-wave Energy Converters Array

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Protection and Control of Modern Power Systems 2024年第5期9卷 142-161页

作者： bo Yang Jinhang Duan Yunfeng Yan Bingqiang Liu Jianxiang Huang Lin jiang Rui han Faculty of Electric Power Engineering Kunming University of Science and TechnologyKunming 650500China College of Electrical Engineering Zhejiang UniversityHangzhou 310027China Company of Kunming Bureau of CSG EHV Transmission Company Kunming 650217China School of Electrical Engineering and Electronics University of LiverpoolLiverpool L693GJUK Company of Electric Power Science Research Institute State Grid Zhejiang Electric Power Company Ltd.Hangzhou 310014China

Marine renewable energy,combining wave energy converters(WECs)and floating wind turbines(FWTs)into hybrid wave-wind energy converters(HWWECs),garners significant global *** offer potential cost reductions,increased power generation,and enhanced system *** absorption power of high wind energy sites is primarily influenced by the complex hydrodynamic interactions among floating bodies,which are closely related to the location and wind-wave environment of high wind energy *** delve into the positive interactions among HWWECs,this paper proposes a HWWEC array optimization strategy based on the artificial ecosystem opti-mization-manta ray foraging optimization coordinated op-timizer(EMCO).In EMCO,the decomposition operator of artificial ecosystem optimization(AEO)and the flip-ping-dipper foraging operator of manta ray foraging opti-mization coordinated(MRFO)cooperate dynamically to effectively balance local exploitation and global *** validate the effectiveness of EMCO,experiments were conducted in scenarios with 3,5,8,and 20 HWWECs,and compared with five typical *** results demonstrate the existence of multiple optimal solutions for HWWEC *** achieves maximum total absorp-tion power and exhibits good ***,EMCO en-hances the q-factor values of HWWECs across four scales:1.0478,1.0586,1.0612,and 0.9965,*** Terms—Marine renewable energy,hybrid wind-wave energy converter,layout optimization,coordinating optimizer.

关键词： Marine renewable energy hybrid wind-wave energy converter layout optimization coordinating optimizer

Comparative analysis of DNA-SIP and magnetic-nanoparticle mediated isolation (MMI) on unraveling dimethoate degraders

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Frontiers of Environmental Science & Engineering 2024年第1期18卷 59-69页

作者： Luning Lian Yi Xing Dayi Zhang Longfei jiang Mengke Song bo jiang School of Energy and Environmental Engineering University of Science&Technology BeijingBeijing 100083China Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants University of Science&Technology BeijingBeijing 100083China National Environmental and Energy Science and Technology International Cooperation Base University of Science&Technology BeijingBeijing 100083China College of New Energy and Environment Jilin UniversityChangchun 130021China Guangzhou Institute of Geochemistry Chinese Academy of SciencesGuangzhou 510640China College of Natural Resources and Environment South China Agricultural UniversityGuangzhou 510642China National Engineering Laboratory for Site Remediation Technologies Beijing 100015China

Microorganisms are crucial in the bioremediation of organophosphorus pesticides. However, most functional microorganisms (> 99%) are yet to be cultivated. This study applied two cultivation-independent approaches, DNA-SIP and magnetic-nanoparticle mediated isolation (MMI), to identify the functional microorganisms in degrading dimethoate in agricultural soils. MMI identified five dimethoate degraders: Pseudomonas, Bacillus, Ramlibacter, Arthrobacter, and Rhodococcus, whereas DNA-SIP identified three dimethoate degraders: Ramlibacter, Arthrobacter, and Rhodococcus. Also, MMI showed higher resolution than DNA-SIP in identifying functional microorganisms. Two organic phosphohydrolase (OPH) genes: ophC2 and ophB, were involved in dimethoate metabolism, as revealed by DNA-SIP and MMI. The degradation products of dimethoate include omethoate, O,O,S-trimethyl thiophosphorothioate, N-methyl-2-sulfanylacetamide, O,O-diethyl S-hydrogen phosphorodithioate, O,O,O-trimethyl thiophosphate, O,O,S-trimethyl thiophosphorodithioate, and O,O,O-trimethyl phosphoric. This study emphasizes the feasibility of using SIP and MMI to explore the functional dimethoate degraders, expanding our knowledge of microbial resources with cultivation-independent approaches.

关键词： Stable isotope probing(SIP) Magnetic-nanoparticle mediated isolation(MMI) Dimethoate Biodegradation Cultivation-independent approach