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Microstructural evolution and mechanical properties of laser-welded joints of medium manganese steel

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Journal of Iron and Steel Research International 2020年第1期27卷 75-87页

作者： Yang Cao Chong Luo lin Zhao Yun Peng Liang Song Cheng-yong Ma Zhi-ling Tian Min-lin Zhong Yan-jie Wang School of Material Science and Engineering Tsinghua UniversityBeijing 100084China Central Iron and Steel Research Institute Beijing 100081China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China

The cold-rolled 5% medium Mn steel was butt-welded using a fiber *** microstructure,distribution of microhardness,and tensile properties of the base metal(bM)and welded joint were *** results showed that the fusion zone of the welded joint had the highest microhardness due to the formatio n of 100%marten site.A finely mixed microstructure of martensite,ferrite,and austenite was formed in the heat-affected zone,and there was no softened zone in this *** tensile test results indicated that the ultimate tensile sirength and yield strength were higher for the joint than for *** joint efficiency was approximately 100%.All samples of the welded joirn failed at the location of bM during tensile *** fracture surfaces of the bM and welded joint were mainly ductile *** bM and welded joint exhibited strain rate independence of the tensile strength and yield strength at strain rates of 0.01-1 s_1,while the yield strength of the bM and welded joint increased rapidly when the strain rate reached 5 s_1 due to changes in the dislocation moveme nt *** uniform elongation of the bM and welded joint decreased with in creasing strain rate.

关键词： Medium Mn steel-Microstructure Microhardness Tensile property Laser welding

Salt-tolerant mechanism of marine Aspergillus niger cellulase cocktail and improvement of its activity

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Chinese Journal of Chemical Engineering 2020年第4期28卷 1120-1128页

作者： linian Cai Shengnan xu Tao Lu Dongqiang lin Shanjing Yao Key Laboratory of biomass Chemical Engineering of Ministry of Education College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027China College of Environment Zhejiang University of TechnologyHangzhou 310014China

The cellulase cocktail produced by marine Aspergillus niger exhibits a property of salt-tolerance,which is of great potential in cellulose degradation in high salt *** order to explain the mechanism on the salttolerance of the cellulase cocktail produced by marine ***,six cellulase components(AnCel6,AnCel7A,AnCel7b,AnEGL,AnbGL1 and AnbGL2)were obtained by directed *** on their enzymatic properties revealed that oneβ-glucosidase(AnbGL2)and one endoglucanase(AnEGL)exhibited an outstanding salttolerant property,and one cellobiohydrolase(AnCel7b)exhibited a certain salt-tolerant *** study revealed that the salt-tolerant An EGL and AnCel7b endowed the cellulase cocktail with stronger salttolerant property,while the salt-tolerant An bGL2 had no positive ***,after overexpression of AnCel6,AnCel7A,AnCel7b and AnEGL,the activity of cellulase cocktail increased by 80%,70%,63%and 68%,***,the activity of cellulase cocktail was not improved after overexpression of AnbGL1 and *** mixed-strain fermentation with cellobiohydrolase recombinants(cel6 a,cel7a and cel7b recombinants)and endoglucanase recombinant(egl recombinant),the the activity of cellulase cocktail increased by 114%,102%and91%,respectively.

关键词： Marine Aspergillus niger Cellulase component Directed expression Salt-tolerance Cellulase activity

The quaternion beam model for hard-magnetic flexible cantilevers

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Applied Mathematics and Mechanics(English Edition) 2023年第5期44卷 787-808页

作者： Wei CHEN Guozhen WANG Yiqun LI lin WANG Zhouping YIN State Key Laboratory of Digital Manufacturing Equipment and Technology School of Mechanical Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Flexible Electronics Research Center Huazhong University of Science and TechnologyWuhan 430074China Department of Engineering Mechanics School of Aerospace EngineeringHuazhong University of Science and TechnologyWuhan 430074China Hubei Key Laboratory for Engineering Structural Analysis and Safety Assessment Huazhong University of Science and TechnologyWuhan 430074China

The recently developed hard-magnetic soft(HMS)materials manufactured by embedding high-coercivity micro-particles into soft matrices have received considerable attention from researchers in diverse fields,e.g.,soft robotics,flexible electronics,and *** investigations on large deformations of HMS structures are significant foundations of their *** work is devoted to developing a powerful theoretical tool for modeling and computing the complicated nonplanar deformations of flexible beams.A so-called quaternion beam model is proposed to break the singularity limitation of the existing geometrically exact(GE)beam *** singularity-free governing equations for the three-dimensional(3D)large deformations of an HMS beam are first derived,and then solved with the Galerkin discretization method and the trustregion-dogleg iterative *** correctness of this new model and the utilized algorithms is verified by comparing the present results with the previous *** superiority of a quaternion beam model in calculating the complicated large deformations of a flexible beam is shown through several benchmark *** is found that the purpose of the HMS beam deformation is to eliminate the direction deviation between the residual magnetization and the applied magnetic *** proposed new model and the revealed mechanism are supposed to be useful for guiding the engineering applications of flexible structures.

关键词： quaternion beam model singularity-free formulation hard-magnetic soft(HMS)beam geometrically exact(GE)equation three-dimensional(3D)large deformation

Recent Advances in Mechanistic Understanding of Metal-Free Carbon Thermocatalysis and Electrocatalysis with Model Molecules

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Nano-Micro Letters 2024年第7期16卷 74-97页

作者： Wei Guo linhui Yu ling Tang Yan Wan Yangming lin CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002People’s Republic of China xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Xiamen Institute of Rare Earth MaterialsHaixi InstituteChinese Academy of SciencesXiamen 361021People’s Republic of China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002People’s Republic of China Institute of Urban Environment Chinese Academy of SciencesXiamen 361021People’s Republic of China

Metal-free carbon,as the most representative heterogeneous metal-free catalysts,have received considerable interests in electro-and thermo-catalytic reac-tions due to their impressive performance and *** the past decade,well-designed carbon catalysts with tunable structures and heteroatom groups coupled with various characterization techniques have proposed numerous reaction ***,active sites,key intermediate species,precise structure-activity relationships and dynamic evolution processes of carbon catalysts are still rife with controversies due to the monotony and limitation of used experimental *** this Review,we sum-marize the extensive efforts on model catalysts since the 2000s,particularly in the past decade,to overcome the influences of material and structure limitations in metal-free carbon *** both nanomolecule model and bulk model,the real contribution of each alien species,defect and edge configuration to a series of fundamentally important reactions,such as thermocatalytic reactions,electrocatalytic reactions,were systematically *** with in situ techniques,isotope labeling and size control,the detailed reaction mechanisms,the precise 2D structure-activity relationships and the rate-determining steps were revealed at a molecular ***,the outlook of model carbon catalysis has also been proposed in this work.

关键词： Metal-free carbon catalysts Model catalyst Electrocatalysis Active site Reaction mechanisms

Modeling of flow and debris ejection in blasting erosion arc machining in end milling mode

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Advances in Manufacturing 2020年第4期8卷 508-518页

作者： Ji-Peng Chen lin Gu Wan-Sheng Zhao Mario Guagliano School of Mechanical and Electronic Engineering Nanjing Forestry UniversityNanjing 210037People's Republic of China Department of Mechanical Engineering Polytechnic University of MilanPiazza Leonardo da Vinci32MilanItaly State Key Laboratory of Mechanical System and Vibration School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240People's Republic of China

blasting erosion arc machining(bEAM)is a typical arc discharge machining technology that was developed around 2012 to improve the machinability of difficult-to-cut *** milling bEAM has been successfully developed and preliminarily applied in ***,owing to the high complexity of the flow field and the difficulty of observing debris in the discharge gap,studies of the flow and debris in end milling bEAM are *** this study,fluid dynamics simulations and particle tracking are used to investigate the flow characteristics and debris ejection processes in end milling ***,the end milling bEAM m o d e is *** the numerical modeling parameters,geometric models,and simulation methods are presented in ***,the flow distribution and debris ejection are described,analyzed,and *** velocity and pressure distributions of the axial feed and radial feed are observed;the rotation speed and milling depth are found to have almost no effect on the flow velocity ***,debris is ejected more rapidly in the radial feed than in the axial *** particle kinetic energy tends to increase with increasing milling depth,and smaller particles are more easily expelled from the flushing *** study attempts to reveal the flow field properties and debris ejection mechanism of end milling bEAM,which will be helpful in gaining a better understanding of bEAM.

关键词： Modeling Flow Debris ejection blasting erosion arc machining(bEAM) End milling

Layout optimization of steel reinforcement in concrete structure using a truss-continuum model

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Frontiers of Structural and Civil Engineering 2023年第5期17卷 669-685页

作者： Anbang CHEN xiaoshan lin Zi-Long ZHAO Yi Min xIE Centre for Innovative Structures and Materials School of EngineeringRMIT UniversityMelbourne 3001Australia Institute of Solid Mechanics School of Aeronautic Science and EngineeringBeihang UniversityBeijing 100191China

Owing to advancement in advanced manufacturing technology,the reinforcement design of concrete structures has become an important topic in structural *** on bi-directional evolutionary structural optimization(bESO),a new approach is developed in this study to optimize the reinforcement layout in steel-reinforced concrete(SRC)*** approach combines a minimum compliance objective function with a hybrid trusscontinuum ***,a modified bi-directional evolutionary structural optimization(M-bESO)method is proposed to control the level of tensile stress in *** fully utilize the tensile strength of steel and the compressive strength of concrete,the optimization sensitivity of steel in a concrete–steel composite is integrated with the average normal stress of a neighboring *** demonstrate the effectiveness of the proposed procedures,reinforcement layout optimizations of a simply supported beam,a corbel,and a wall with a window are *** steel trajectories of SRC structures can be obtained using both *** area of critical tensile stress in concrete yielded by the M-bESO is more than 40%lower than that yielded by the uniform design and ***,the M-bESO facilitates a fully digital workflow that can be extremely effective for improving the design of steel reinforcements in concrete structures.

关键词： bi-directional evolutionary structural optimization steel-reinforced concrete concrete stress reinforcement method hybrid model

Zinc alleviates the heat stress of primary cultured hepatocytes of broiler embryos via enhancing the antioxidant ability and attenuating the heat shock responses

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Animal Nutrition 2021年第3期7卷 621-630页

作者： Tingting Li Wengang He xiudong Liao xi lin Liyang Zhang lin Lu Yanli Guo Zongping Liu xugang Luo Poultry Mineral Nutrition Laboratory College of Animal Science and TechnologyYangzhou UniversityYangzhou 225009China Mineral Nutrition Research Division Institute of Animal ScienceChinese Academy of Agricultural SciencesBeijing 100193China College of Animal Science and Technology Gansu Agricultural UniversityLanzhou 730070China Department of Animal Science North Carolina State UniversityRaleighNC 27695USA College of Veterinary Medicine Yangzhou UniversityYangzhou 225009China

Zinc(Zn)has been shown to attenuate the adverse effects of heat stress on broilers,but the mechanisms involving this process remain *** aimed to investigate possible protective mechanisms of Zn on primary cultured hepatocytes of broiler embryos subjected to heat *** experiments were *** Exp.1,hepatocytes were treated with 0,50,100,200,or 400μmol/L added Zn as inorganic Zn sulfate(iZn)for 12,24 or 48 *** Exp.2,cells were exposed to 40℃(a normal temperature[NT])and 44℃(a high temperature[HT])for 1,2,4,6,or 8 *** Exp.3,cells were preincubated with 0 or 50μmol/L Zn as iZn or organic Zn lysine chelate(oZn)for 8 h under NT,and then incubated with the same Zn treatments under NT or HT for 4 or 6 *** biomarkers of antioxidative status and heat stress in cells were *** results in Exp.1 indicated that 50μmol/L Zn and 12 h incubation were the optimal conditions for increasing antioxidant ability of *** Exp.2,the 4 or 6 h incubation under HT was effective in inducing heat shock responses of *** Exp.3,HT elevated(Pxpressions of heat shock protein 70(HSP70)mRNA and protein,as well as HSP90 ***,Zn supplementation increased(Pxide dismutase(CuZnSOD)activity and metallothionein mRNA expression,and effectively decreased(Px-pressions of HSP70 mRNA and protein,as well as HSP90 ***,oZn was more effective(Pbroiler hepatocytes via enhancing their antioxidant ability and attenuating heat shock responses.

关键词： broiler hepatocyte Zinc Heat stress Antioxidant ability Heat shock response

ObSERVATION OF MYO-INOSITOL CONCENTRATIONS IN bIPOLAR DISORDER PATIENTS RECEIVING SODIUM VALPROATE:An in vivo Proton MR Spectroscopy Quantitative Study

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波谱学杂志 2002年第1期19卷 96-97页

作者： R.H.WU P.SILVERSTONE J.MA H.Kim H.b.RAO x.H.xU Shantou University Medical College China University of Alberta Canada University of Alberta Canada Dalian Medical University China Shantou University Medical College China

Introduction:Previous magnetic resonance spectroscopy (MRS) studies have suggested that lithium used in patients with bipolar disorder may alter brain myo-inositol concentrations.

关键词： MR ObSERVATION OF MYO-INOSITOL CONCENTRATIONS IN bIPOLAR DISORDER PATIENTS RECEIVING SODIUM VALPROATE MYO

Controlled growth of two-dimensional InAs single crystals via van der Waals epitaxy

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Nano Research 2022年第11期15卷 9954-9959页

作者： Jiuxiang Dai Teng Yang Zhitong Jin Yunlei Zhong xianyu Hu Jingyi Zou Weigao xu Tao Li Yuxuan lin xu Zhang lin Zhou School of Chemistry and Chemical Engineering Frontiers Science Centre for Transformative MoleculesShanghai Jiao Tong UniversityShanghai 200240China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Department of Electrical and Computer Engineering Carnegie Mellon UniversityPittsburghPA 15213USA Key Laboratory of Mesoscopic Chemistry School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China Department of Electrical Engineering and Computer Sciences University of CaliforniaBerkeleyCA 94720USA

Two-dimensional(2D)indium arsenide(InAs)is promising for future electronic and optoelectronic applications such as highperformance nanoscale transistors,flexible and wearable devices,and high-sensitivity broadband photodetectors,and is advantageous for its heterogeneous integration with Si-based ***,the synthesis of 2D InAs single crystals is challenging because of the nonlayered *** we report the van der Waals epitaxy of 2D InAs single crystals,with their thickness down to 4.8 nm,and their lateral sizes up to~37μ*** as-grown InAs flakes have high crystalline quality and are *** thickness can be tuned by growth time and ***,we explore the thickness-dependent optical properties of InAs *** measurement reveals that 2D InAs possesses high conductivity and high carrier *** work introduces InAs to 2D materials family and paves the way for applying 2D InAs in high-performance electronics and optoelectronics.

关键词： two-dimensional materials van der Waals epitaxy indium arsenide nonlayered material