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Modified constitutive models for Inconel 718 considering current density and temperature in electrically assisted forming process

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Chinese j.urnal of Aeronautics 2024年第2期37卷 524-540页

作者： Xuan CUI Rui ZHAO Min wan School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China j.angxi Research Institute of Beihang University Jiangxi 330000China

Electrically Assisted Forming(EAF)technology has obvious advantages in material *** develop an effective constitutive model considering electrical effects,room temperature and electrically assisted quasi-static uniaxial tensile tests w.re conducted using ultrathin nickelbased superalloy plates w.th a thickness of 0.25 *** research focused on the tw. most w.dely recognized effects:the j.ule thermal and the electric athermal *** mechanism of current action can be divided into tw. scenarios:one considering the j.ule thermal effect only,and the other considering both effects *** basic constitutive models,namely the Modified-Hollomon model and the j.hnson-Cook(j.C)model,w.re selected to be optimized through the classification of tw. different situations,and four optimized constitutive models w.re *** w.s found that the j.C model w.th simultaneous consideration of the j.ule thermal effect and electric athermal effect had the best prediction effect by comparing the results of these four ***,the accuracy of the optimization model w.s verified by finite element simulation of the electrically assisted stretching optimization *** results show.that the constitutive model can effectively predict the temperature effect caused by the j.ule heat effect and the athermal effect of current on the material.

关键词： j.ule heating Elastoplasticity Plastic deformation Superalloys Constitutive models

Heterogeneous Task Allocation Model and Algorithm for Intelligent Connected Vehicles

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Computers, Materials & Continua 2024年第9期80卷 4281-4302页

作者： Neng wan.Guangping Zeng Xianw.i Zhou School of Computer and Communication Engineering University of Science and Technology BeijingBeijing100083China School of Mechanical and Transportation Southwest Forestry UniversityKunming650224China

w.th the development of vehicles tow.rds intelligence and connectivity,vehicular data is diversifying and grow.ng dramatically.A task allocation model and algorithm for heterogeneous Intelligent Connected Vehicle(ICV)applications are proposed for the dispersed computing netw.rk composed of heterogeneous task vehicles and Netw.rk Computing Points(NCPs).Considering the amount of task data and the idle resources of NCPs,a computing resource scheduling model for NCPs is *** the heterogeneous task execution delay threshold as a constraint,the optimization problem is described as the problem of maximizing the utilization of computing resources by *** proposed problem is proven to be NP-hard by using the method of reduction to a 0-1 knapsack problem.A many-to-many matching algorithm based on resource preferences is *** algorithm first establishes the mutual preference lists based on the adaptability of the task requirements and the resources provided by *** enables the filtering out of un-schedulable NCPs in the initial stage of matching,reducing the solution space *** solve the matching problem betw.en ICVs and NCPs,a new.manyto-many matching algorithm is proposed to obtain a unique and stable optimal matching *** simulation results demonstrate that the proposed scheme can improve the resource utilization of NCPs by an average of 9.6%compared to the reference scheme,and the total performance can be improved by up to 15.9%.

关键词： Task allocation intelligent connected vehicles dispersed computing matching algorithm

Cobalt-catalyzed reductive alkynylation to construct C(sp)-C(sp^(3))and C(sp)-C(sp^(2))bonds

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Chinese Chemical Letters 2024年第7期35卷 253-258页

作者： Lei wan.Yizhou Tong Xi Lu Yao Fu Hefei National Research Center for Physical Sciences at the Microscale iChEMCAS Key Laboratory of Urban Pollutant ConversionAnhui Province Key Laboratory of Biomass Clean EnergyUniversity of Science and Technology of ChinaHefei 230026China Key Laboratory of Precision and Intelligent Chemistry School of Chemistry and Materials ScienceUniversity of Science and Technology of ChinaHefei 230026China

Transition-metal-catalyzed cross-electrophile coupling has emerged as a reliable method for constructing carbon–carbon ***,w. report a general method,cobalt-catalyzed reductive alkynylation,to construct C(sp)-C(sp^(3))and C(sp)-C(sp^(2))*** presented reaction has a broad substrate scope,enabling the efficient cross-electrophile coupling betw.en alkynyl bromides w.th alkyl halides and aryl or alkenyl(pseudo)*** presented reaction is conducted under mild conditions,tolerating many functional groups,thus suitable for the modification and synthesis of biologically active molecules.

关键词： Cobalt-catalysis Cross-electrophile coupling Carbon-carbon bond formation Reductive alkynylation Alkyne synthesis

Recent Advances in Mechanistic Understanding of Metal-Free Carbon Thermocatalysis and Electrocatalysis w.th Model Molecules

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Nano-Micro Letters 2024年第7期16卷 74-97页

作者： w.i 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,w.ll-designed carbon catalysts w.th tunable structures and heteroatom groups coupled w.th 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 w.th controversies due to the monotony and limitation of used experimental *** this Review.w. 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,w.re systematically *** w.th in situ techniques,isotope labeling and size control,the detailed reaction mechanisms,the precise 2D structure-activity relationships and the rate-determining steps w.re revealed at a molecular ***,the outlook of model carbon catalysis has also been proposed in this w.rk.

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

Transverse momentum balance of dij.ts in Xe+Xe collisions at the LHC

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Nuclear Science and Techniques 2024年第7期35卷 137-146页

作者： Yao Li Shu-wan.Shen Sa wan. Ben-w.i Zhang Key Laboratory of Quark&Lepton Physics(MOE)and Institute of Particle Physics Central China Normal UniversityWuhan430079China College of Science China Three Gorges UniversityYichang443002China Center for Astronomy and Space Sciences and Institute of Modern Physics China Three Gorges UniversityYichang443002China Guangdong-Hong Kong j.int Laboratory of Quantum Matter Guangdong Provincial Key Laboratory of Nuclear ScienceSouthern Nuclear Science Computing CenterSouth China Normal UniversityGuangzhou510006China

w. present a theoretical study of the medium modifications of the p_(T)balance (x_(j.) of dij.ts in Xe+Xe collisions at■.The initial production of dij.ts w.s carried out using the POw.EG+PYTHIA8 prescription,w.ich matches the next-toleading-order (NLO) QCD matrix elements w.th the parton show.r (PS) *** SHELL model described the in-medium evolution of nucleus–nucleus collisions using a transport *** theoretical results of the dij.t xj.n the Xe+Xe collisions exhibit more imbalanced distributions than those in the p+p collisions,consistent w.th recently reported ATLAS *** utilizing the Interleaved Flavor Neutralisation,an infrared-and-collinear-safe j.t flavor algorithm,to identify the flavor of the reconstructed j.ts,w. classify dij.ts processes into three categories:gluon–gluon (gg),quark–gluon (qg),and quark–quark (qq),and investigated the respective medium modification patterns and fraction changes of the gg,qg,and qq components of the dij.t sample in Xe+Xe *** is show. that the increased fraction of qg component at a small x_(j.contributes to the imbalance of the dij.t;in particular,the q_(1)g_(2)(quark-j.t-leading) dij.ts experience more significant asymmetric energy loss than the g_(1)q_(2)(gluon-j.t-leading) dij.ts traversing the *** comparing the■of inclusive,■ dij.ts in Xe+Xe collisions,w. observe■.Moreover,ρ_(Xe),P_(b),the ratios of the nuclear modification factors of dij.ts in Xe+Xe to those in Pb+Pb,w.re calculated,w.ich indicates that the yield suppression of dij.ts in Pb+Pb is more pronounced than that in Xe+Xe ow.ng to the larger radius of the lead nucleus.

关键词： Heavy-ion collisions Quark-gluon plasma j.t quenching Transverse momentum balance

RFFsNet-SEI:a multidimensional balanced-RFFs deep neural netw.rk framew.rk for specific emitter identification

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j.urnal of Systems Engineering and Electronics 2024年第3期35卷 558-574,F0002页

作者： FAN Rong SI Chengke HAN Yi wan.Qun School of Information and Communication Engineering University of Electronic Science and Technology of ChinaChengdu 611731China Institute of Electronic and Electrical Engineering Civil Aviation Flight University of ChinaGuanghan 618307China

Existing specific emitter identification(SEI)methods based on hand-crafted features have draw.acks of losing feature information and involving multiple processing stages,w.ich reduce the identification accuracy of emitters and complicate the procedures of *** this paper,w. propose a deep SEI approach via multidimensional feature extraction for radio frequency fingerprints(RFFs),namely,***,w. extract multidimensional physical RFFs from the received signal by virtue of variational mode decomposition(VMD)and Hilbert transform(HT).The physical RFFs and I-Q data are formed into the balanced-RFFs,w.ich are then used to train *** introducing model-aided RFFs into neural netw.rk,the hybrid-driven scheme including physical features and I-Q data is *** improves physical interpretability of ***,since RFFsNet-SEI identifies individual of emitters from received raw.data in end-to-end,it accelerates SEI implementation and simplifies procedures of ***,as the temporal features and spectral features of the received signal are both extracted by RFFsNet-SEI,identification accuracy is ***,w. compare RFFsNet-SEI w.th the counterparts in terms of identification accuracy,computational complexity,and prediction *** results illustrate that the proposed method outperforms the counterparts on the basis of simulation dataset and real dataset collected in the anechoic chamber.

关键词： specific emitter identification(SEI) deep learning(DL) radio frequency fingerprint(RFF) multidimensional feature extraction(MFE) variational mode decomposition(VMD)

Defect detection and repair algorithm for structures generated by topology optimization based on 3D hierarchical fully convolutional netw.rk

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Biomimetic Intelligence & Robotics 2024年第2期4卷 24-31页

作者： Zhiyu wan.Hai Lan Sichao Lin Houde Dai School of Advanced Manufacturing Fuzhou UniversityJinjiang 362251China Quanzhou Institute of Equipment Manufacturing Haixi InstitutesChinese Academy of SciencesJinjiang 362216China Fuj.an Key Laboratory of Special Intelligent Equipment Safety Measurement and Control Fujian Special Equipment Inspection and Research InstituteFuzhou 350008China

Customized 3D-printed structural parts are w.dely used in surgical *** satisfy the mechanical properties and kinematic functions of these structural parts,a topology optimization technique is adopted to obtain the optimal structural layout w.ile meeting the constraints and ***,topology optimization currently faces some practical challenges that must be addressed,such as ensuring that structures do not have significant defects w.en converted to additive manufacturing *** address this problem,w. designed a 3D hierarchical fully convolutional netw.rk(FCN)to predict the precise position of the defective *** on the prediction results,an effective repair strategy is adopted to repair the defective structure.A series of experiments is conducted to demonstrate the effectiveness of our *** to the 2D fully convolutional netw.rk and the rule-based detection method,our approach can accurately capture most defect structures and achieve 89.88%precision and 95.59%***,w. investigate the impact of different w.ys to increase the receptive field of our model,as w.ll as the trade-off betw.en different defect-repairing *** results of the experiment demonstrate that the hierarchical structure,w.ich increases the receptive field,can substantially improve the defect detection *** the best of our know.edge,this paper is the first to investigate 3D defect prediction and repair for topology optimization in conj.nction w.th deep learning algorithms,providing practical tools and new.perspectives for the subsequent development of topology optimization techniques.

关键词： Topology optimization Additive manufacturing Deep learning 3D semantic segmentation Defect detection

Synthesis of porous flow.r-like SnO_(2)/CdSnO_(3) microstructures w.th excellent sensing performances for volatile organic compounds

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Frontiers of Materials Science 2024年第1期18卷 45-57页

作者： j.e wan.Gang wan. Haibo Ren j.arui Huang Sang w.o j.o School of Materials Science and Engineering Anhui Polytechnic UniversityWuhu 241000China Key Laboratory of Functional Molecular Solids of the Ministry of Education College of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241002China School of Mechanical Engineering Yeungnam UniversityGyeongsanGyeoungbuk 712749Republic of Korea

Porous flow.r-like SnO_(2)/CdSnO_(3) microstructures self-assembled by uniform nanosheets w.re synthesized using a hydrothermal process follow.d by calcination,and the sensing performance w.s measured w.en a gas sensor,based on such microstructures,w.s exposed to various volatile organic compound(VOC)*** response value w.s found to reach as high as 100.1 w.en the SnO_(2)/CdSnO_(3) sensor w.s used to detect 100 ppm formaldehyde gas,much larger than those of other tested VOC gases,indicating the high gas sensitivity possessed by this sensor especially in the detection of formaldehyde ***,the response/recovery process w.s fast w.th the response time and recovery time of only 13 and 21 s,*** excellent gas sensing performance derive from the advantages of SnO_(2)/CdSnO_(3),such as abundant n-n heteroj.nctions built at the interface,high available specific surface area,abundant porosity,large pore size,and rich reactive oxygen species,as w.ll as j.int effects arising from SnO_(2) and CdSnO_(3),suggesting that such porous flow.r-like SnO_(2)/CdSnO_(3) microstructures composed of nanosheets have a high potential for developing gas sensors.

关键词： SnO_(2)/CdSnO_(3) porous flow.r-like microstructure volatile organic gas sensingproperty gas sensor

Steric hindrance shielding viologen against alkali attack in realizing ultrastable aqueous flow.batteries

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j.urnal of Energy Chemistry 2024年第10期97卷 529-534页

作者： Liw.n wan. Kai wan.Xianzhi Yuan Zhipeng Xiang Zhiyong Fu Zhenxing Liang Guangdong Provincial Key Laboratory of Fuel Cell Technology School of Chemistry and Chemical Engineering South China University of Technology State Key Laboratory of Pulp and Paper Engineering South China University of Technology Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering j.eyang Center

Viologens know. as a kind of promising negolyte materials for aqueous organic redox flow.batteries,face a critical stability challenge due to the SN2 nucleophilic attack by hydroxide ions（OH-） during the battery *** this w.rk,a N-cyclic quaternary ammonium-grafted viologen molecule,viz.1,1'-bis（4,4'-dime thylpiperidiniumyl）-4,4'-bipyridinium tetrachloride(（DBPPy）Cl4),is developed by the molecular engineering *** obtained（DBPPy）Cl4molecule show. a decent solubility of 1.84 M and a redox potential of-0.52 V ***/AgCl,Experimental and theoretical results reveal that the grafted N-cyclic quaternary ammonium groups act as the steric hindrance to prevent nucleophilic attack by OH-,increasing the alkali resistance of the electroactive *** symmetrical battery w.th 0.50 M（DBPPy）Cl4show. negligible decay during the 13-day cycling *** demonstration,the flow.battery utilizing 1.0 M（DBPPy）Cl4as the negolyte and 1-（1-oxyl-2,2',6,6'-tetramethylpiperidin-4-yl）-1'-(3-（trimethylammonio）propyl)-4,4'-bipyridinium trichloride as the posolyte exhibits a high capacity retention rate of 99.99% per cycle at 60 mA cm-2.

关键词： Alkali resistance Aqueous organic flow.batteries Stability Steric hindrance Viologen