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Microstructure Evolution and Mechanical Properties of Friction Stir Welded Al-Cu-Li Alloy

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Acta Metallurgica Sinica(English Letters) 2024年第5期37卷 855-871页

作者： Peng chen Wenhao chen jiaxin chen Zhiyu chen Yang Tang Ge Liu Bensheng Huang Zhiqing Zhang School of New Energy and Materials Southwest Petroleum UniversityChengdu 610500China Sichuan Provincial Engineering Research Center of Advanced Materials Manufacturing Technology for Shale Gas High-Efficient Exploitation Southwest Petroleum UniversityChengdu 610500China College of Materials Science and Engineering Chongqing UniversityChongqing 400045China School of Mechatronic Engineering Southwest Petroleum UniversityChengdu 610500China School of Robot Engineering Yangtze Normal UniversityChongqing 408100China

The investigation concentrates on friction stir welded(FSW)Al-Cu-Li alloy concerning its local microstructural evolution and mechanical *** grain features were characterized by electron back scattered diffraction(EBSD)technology,while precipitate characterization was conducted by using transmission electron microscopy(TEM)aligned along[011]Al and[001]Al zone *** mechanical properties are evaluated through micro-hardness and tensile *** can be found that nugget zones exhibit finely equiaxed grains evolved through complete dynamic recrystallization(DRX),primarily occurring in continuous dynamic recrystallization(CDRX)and discontinuous dynamic recrystallization(DDRX).In the thermal-mechanically affected zone(TMAZ),numerous sub-structured grains,exhibiting an elongated morphology,were created due to partial DRX,signifying the dominance of CDRX,DDRX,and geometric dynamic recrystallization(GDRX)in this region.T_(1)completely dissolves in the nugget zone(NZ)leading to the formation of Guinier-Preston zones and increase ofδ′,β′and S′.Conversely,T_(1)partially solubilizes in TMAZ,the lowest hardness zone(LHZ)and heat affected zone(HAZ),and the residual T_(1)undergoes marked coarsening,revealing various T_(1)*** solubilization and coarsening of T_(1)are primary contributors to the degradation of hardness and strength.θ′primarily dissolves and coarsens in NZ and TMAZ,whilst this precipitate largely coarsens in HAZ and LHZ.σ,TB,grain boundary phases(GBPs)and precipitate-free zone(PFZ)are newly generated during FSW.σexists in the TMAZ,LHZ and HAZ,whereas TB nucleates in *** and PFZ mostly develop in LHZ and HAZ,which can cause strain localization during tensile deformation,potentially leading to LHZ joint fracture.

关键词： Al-Cu-Li alloy Friction stir welding Microstructure evolution Mechanical properties

2D-materials-based optoelectronic synapses for neuromorphic applications

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eScience 2023年第6期3卷 36-50页

作者： jiaxin chen Wentao Xu Institute of Photoelectronic Thin Film Devices and Technology Key Laboratory of Photoelectronic Thin Film Devices and Technology of TianjinCollege of Electronic Information and Optical EngineeringEngineering Research Center of Thin Film Photoelectronic Technology of Ministry of EducationSmart Sensing Interdisciplinary Science CenterNankai UniversityTianjin 300350China Shenzhen Research Institute of Nankai University Shenzhen 518000China

Optoelectronic artificial synapses(OEASs)are essential for realizing artificial neural networks(ANNs)in nextgeneration information processing that has high transmission speed,high bandwidth,and low power ***-dimensional(2D)materials endowed with strong light-matter interactions and atomically thin dangling-bond-free surfaces are candidates for achieving versatile *** 2D OEASs for future neuromorphic applications is significant to break the bottleneck of von Neumann architecture and achieve future artificial intelligence *** review primarily focuses on recent developments in advanced 2D OEASs,discussing their working mechanism as well as potential *** materials,device structures,and their synthesis and construction methods are also ***,the prospects for future 2D OEASs from the perspectives of materials,performance,and applications are briefly described.

关键词： 2D materials Optoelectronic synapses Artificial neuromorphic systems Artificial synapses Synaptic plasticity

A Game-Theoretic Perspective on Resource Management for Large-Scale UAV Communication Networks

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China Communications 2021年第1期18卷 70-87页

作者： jiaxin chen Ping chen Qihui Wu Yuhua Xu Nan Qi Tao Fang Key Laboratory of Dynamic Cognitive System of Electromagnetic Spectrum Space Ministry of Industry and Information TechnologyCollege of Electronic and Information EngineeringNanjing University of Aeronautics and AstronauticsNanjing 211106China State Key Laboratory of Air Traffic Management System and Technology Nanjing 210014China th Research Institute of China Electronics Technology Group Corporation Nanjing 210007China College of Communications Engineering Army Engineering University of PLANanjing 210007China

As a result of rapid development in electronics and communication technology,large-scale unmanned aerial vehicles(UAVs)are harnessed for various promising applications in a coordinated *** it poses numerous advantages,resource management among various domains in large-scale UAV communication networks is the key challenge to be solved ***,due to the inherent requirements and future development trend,distributed resource management is *** this article,we investigate the resource management problem for large-scale UAV communication networks from game-theoretic perspective which are exactly coincident with the distributed and autonomous *** exploring the inherent features,the distinctive challenges are ***,we explore several gametheoretic models that not only combat the challenges but also have broad application *** provide the basics of each game-theoretic model and discuss the potential applications for resource management in large-scale UAV communication ***,mean-field game,graphical game,Stackelberg game,coalition game and potential game are *** that,we propose two innovative case studies to highlight the feasibility of such novel game-theoretic ***,we give some future research directions to shed light on future opportunities and applications.

关键词： large-scale UAV communication networks resource management game-theoretic model

Enhancing Clustering Stability in VANET: A Spectral Clustering Based Approach

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China Communications 2020年第4期17卷 140-151页

作者： Gang Liu Nan Qi jiaxin chen Chao Dong Zanqi Huang College of electronic and information engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Vehicles can establish a collaborative environment cognition through sharing the original or processed sensor data from the vehicular sensors and status map. Clustering in the vehicular ad-hoc network(VANET) is crucial for enhancing the stability of the collaborative environment. In this paper, the problem for clustering is innovatively transformed into a cutting graph problem. A novel clustering algorithm based on the Spectral Clustering algorithm and the improved force-directed algorithm is designed. It takes the average lifetime of all clusters as an optimization goal so that the stability of the entire system can be enhanced. A series of close-to-practical scenarios are generated by the Simulation of Urban Mobility(SUMO). The numerical results indicate that our approach has superior performance in maintaining whole cluster stability.

关键词： VANET spectral clustering force-directed algorithm whole cluster stability

Flexible 2D Cu Metal:Organic Framework@MXene Film Electrode with Excellent Durability for Highly Selective Electrocatalytic NH_(3) Synthesis

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Research 2022年第3期2022卷 321-331页

作者： Jing Wang Tao Feng jiaxin chen Jr-Hau He Xiaosheng Fang Department of Materials Science Fudan UniversityShanghai 200433China School of Chemical and Environmental Engineering Shanghai Institute of TechnologyShanghai 201418China Department of Materials Science and Engineering City University of Hong KongTat Chee AvenueKowloonHong Kong

Electrocatalytic nitrate reduction to ammonia(ENRA)is an effective strategy to resolve environmental and energy crisis,but there are still great challenges to achieve high activity and stability synergistically for practical application in a fluid *** flexible film electrode may solve the abovementioned problem of practical catalytic application owing to the advantages of low cost,light weight,eco-friendliness,simple and scalable fabrication,extensive structural stability,and electrocatalytic ***,2D hybridization copper 1,4-benzenedi-carboxylate(CuBDC)has been grown on electronegative MXene nanosheets(Ti_(3)C_(2)T_(x))seamlessly to prepare a 2D flexible CuBDC@Ti_(3)C_(2)T_(x)electrode for *** flexible electrode simultaneously exhibits high Faradaic efficiency(86.5%)and excellent stability for NH_(3)synthesis,which are comparable to previously reported nanomaterials toward ***,the flexible electrode maintains outstanding FENH_(3)toward ENRA after the bending,twisting,folding,and crumpling tests,indicating excellent electroconductibility,high stability,and *** work not only provides mild permeation-mediated strategy to fabricate a flexible electrode but also explores the practical applications of the electrode with effectively environmental adaptability in solving global environmental contamination and energy crisis by effective ENRA.

关键词： electrode catalytic stability

Shear-responsive peptide/siRNA complexes as lung-targeting gene vectors

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Chinese Chemical Letters 2021年第5期32卷 1731-1736页

作者： Dongxiao Yin Mengjie Zhang jiaxin chen Yuanyu Huang Dehai Liang Beijing National Laboratory for Molecular Sciences and the Key Laboratory of Polymer Chemistry and Physics of Ministry of Education College of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China School of Life Science Advanced Research Institute of Multidisciplinary ScienceInstitute of Engineering MedicineKey Laboratory of Molecular Medicine and BiotherapyBeijing Institute of TechnologyBeijing 100081China

Particles administrated intravenously will pass through the pulmonary capillary network before being distributed to the ***,fabrication of vectors sensitive to blood shear and active with blood components should be a practical approach to develop lung-targe ting gene carriers self-regulated by circulatory *** this work,we designed a series of cationic peptides with the same charge density but varying hydrophobicity and capacity to form hydrogen bonds,and investigated their ability to form co mplexes with siRNA,the behaviours of peptide/siRNA complexes in the presence of serum under shear,and the lung-targeting efficacy of the complexes regulated by *** hydrophobic interaction co ntrols the complexation between peptide and siRNA,while the hydrogen bonds are responsible for the binding of peptides to the serum components in *** vivo tests show that all the peptide/siRNA complexes can accumulate in ***,only the complexes that exhibit weak interaction with serum components and can be broken down by shear avoid the inflammation and death caused by pulmonary ***,the peptide with strong hydrophobicity can retain siRNA in lung without early release of the *** study provides a step toward the development of adaptive gene carriers under the regulation of circulatory system.

关键词： Peptide Gene delivery Shear Polyelectrolyte complexes

A New Modified Two-Subgradient Extragradient Algorithm for Solving Variational Inequality Problems

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Journal of Mathematical Research with Applications 2022年第4期42卷 402-412页

作者： jiaxin chen Minglu YE School of Mathematical Sciences Sichuan Normal University School of Mathematics and Information China West Normal University

In this paper, we propose a modified two-subgradient extragradient algorithm(MTSEGA) for solving monotone and Lipschitz continuous variational inequalities with the feasible set being a level set of a smooth convex function in Hilbert space. The advantage of MTSEGA is that all the projections are computed onto a half-space per iteration. Moreover, MTSEGA only needs one computation of the underlying mapping per iteration. Under the same assumptions with the known algorithm, we show that the sequence generated by this algorithm is weakly convergent to a solution of the concerned problem.

关键词： two-subgradient extragradient algorithm monotone Lipschitz continuous variational inequality Hilbert space

Reinforcement Learning-Based Energy Management for Hybrid Power Systems:State-of-the-Art Survey,Review,and Perspectives

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Chinese Journal of Mechanical Engineering 2024年第3期37卷 1-25页

作者： Xiaolin Tang jiaxin chen Yechen Qin Teng Liu Kai Yang Amir Khajepour Shen Li College of Mechanical and Vehicle Engineering Chongqing UniversityChongqing 400044China School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China Department of Mechanical and Mechatronics Engineering University of WaterlooWaterlooON N2L 3G1Canada School of Civil Engineering Tsinghua UniversityBeijing 100084China

The new energy vehicle plays a crucial role in green transportation,and the energy management strategy of hybrid power systems is essential for ensuring energy-efficient *** paper presents a state-of-the-art survey and review of reinforcement learning-based energy management strategies for hybrid power ***,it envisions the outlook for autonomous intelligent hybrid electric vehicles,with reinforcement learning as the foundational *** of all,to provide a macro view of historical development,the brief history of deep learning,reinforcement learning,and deep reinforcement learning is presented in the form of a ***,the comprehensive survey and review are conducted by collecting papers from mainstream academic *** most of the contributions based on three main directions—algorithm innovation,powertrain innovation,and environment innovation—provides an objective review of the research ***,to advance the application of reinforcement learning in autonomous intelligent hybrid electric vehicles,future research plans positioned as“Alpha HEV”are envisioned,integrating Autopilot and energy-saving control.

关键词： New energy vehicle Hybrid power system Reinforcement learning Energy management strategy

Coal rock image recognition method based on improved CLBP and receptive field theory

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Deep Underground Science and Engineering 2022年第2期1卷 165-173页

作者： Chuanmeng Sun Ruijia Xu Chong Wang Tiehua Ma jiaxin chen State Key Laboratory of Dynamic Testing Technology TaiyuanShanxiChina School of Electrical and Control Engineering North University of ChinaTaiyuanShanxiChina

Rapid coal-rock identification is one of the key technologies for intelligent and unmanned coal ***,the existing image recognition algorithms cannot satisfy practical needs in terms of recognition speed and *** view of the evident differences between coal and rock in visual attributes such as color,gloss and texture,the complete local binary pattern(CLBP)image feature descriptor is introduced for coal and rock image *** that the original algorithm oversimplifies local texture features by ignoring imaging information from higher-order pixels and the concave and convex areas between adjacent sampling points,this paper proposes a higher-order differential median CLBP image feature descriptor to replace the original CLBP center pixel gray with a local gray median,and replace the binary differential with a second-order ***,for the high dimensionality of CLBP descriptor histogram and feature redundancy,deep learning perceptual field theory is introduced to realize data nonlinear dimensionality reduction and deep feature *** relevant experiments conducted,the following conclusion can be drawn:(1)Compared with that of the original CLBP,the recognition accuracy of the improved CLBP algorithm is greatly improved and finally stabilized above 94.3%under strong noise interference;(2)Compared with that of the original CLBP model,the single image recognition time of the coal rock image recognition model fusing the improved CLBP and the receptive field theory is 0.0035 s,a reduction of 71.0%;compared with the improved CLBP model(without the fusion of receptive field theory),it can shorten the recognition time by 97.0%,but the accuracy rate still maintains more than 98.5%.The method offers a valuable technical reference for the fields of mineral development and deep mining.

关键词： coal-rock identification complete local binary pattern receptive field texture feature