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Residual Stress Removal Under Pulsed Electric Current

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Acta Metallurgica Sinica(English Letters) 2020年第2期33卷 281-289页

作者： Siqi xiang Xinfang Zhang State Key Laboratory of Advanced Metallurgy School of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijing 100083China

The effect of a pulsed electric current on the residual stress evolution of metal materials has been *** was found that the surface and internal residual stresses in the as-quenched samples were reduced dramatically by electropulsing.A large number of experimental data show that the residual stress reduction is proportional to the initial residual stress and related to the material properties and electropulsing *** the combined actions of drift electrons,Joule heating,and residual stress,the dislocation mobility was enhanced,resulting in plastic strain and the decrease in residual *** electrons played a unique role in the electropulsing treatment,acting as an additional force pushing dislocations *** dislocations ultimately accumulated at a grain boundary,forming a parallel ***,the phenomenological equation of the residual stress evolution under electropulsing was derived from the experimental data.

关键词： Electroplastic Residual stress Dislocation movement Phenomenological equation

Dual-ion carrier storage through Mg^(2+) addition for high-energy and long-life zinc-ion hybrid capacitor

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International Journal of Minerals,Metallurgy and Materials 2024年第1期31卷 179-185页

作者： Junjie Zhang xiang Wu School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China

Cation additives can efficiently enhance the total electrochemical capabilities of zinc-ion hybrid capacitors (ZHCs).However their energy storage mechanisms in zinc-based systems are still under ***,we modulate the electrolyte and achieve dual-ion storage by adding magnesium *** we assemble several Zn//activated carbon devices with different electrolyte concentrations and investigate their electrochemical reaction dynamic *** zinc-ion capacitor with Mg^(2+)mixed solution delivers 82 mAh·g^(-1)capacity at 1 A·g^(-1) and maintains 91%of the original capacitance after 10000 *** is superior to the other assembled zinc-ion devices in single-component *** finding demonstrates that the double-ion storage mechanism enables the superior rate performance and long cycle lifetime of ZHCs.

关键词： zinc-ion hybrid capacitor MgSO_(4) electrolyte rate performance storage mechanism

High Chern number phase in topological insulator multilayer structures:A Dirac cone model study

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Chinese Physics B 2022年第9期31卷 217-224页

作者： Yi-xiang Wang Fu-xiang Li School of Science Jiangnan UniversityWuxi 214122China School of Physics and Electronics Hunan UniversityChangsha 410082China

We employ the Dirac cone model to explore the high Chern number(C)phases that are realized in the magnetic-doped topological insulator(TI)multilayer structures by Zhao et al.[Nature 588419(2020)].The Chern number is calculated by capturing the evolution of the phase boundaries with the parameters,then the Chern number phase diagrams of the TI multilayer structures are *** high-C behavior is attributed to the band inversion of the renormalized Dirac cones,along with which the spin polarization at theΓpoint will get ***,another two TI multilayer structures as well as the TI superlattice structures are studied.

关键词： topological insulator multilayer Chern number phase diagram

Experimental isothermal section phase diagram of Ho-Fe-In at 773 K and magnetic properties of Ho_(12)Fe_(2.08)In_(2.92) alloy

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Rare Metals 2021年第4期40卷 987-994页

作者： xiang Chen Chao Ni The College of Physics and Electronic Information Engineering Neijiang Normal UniversityNeijiang 641002China The Ames Laboratory U.S.Department of EnergyIowa State UniversityAmesIA 50011-3020USA

The isothermal section of the Ho-Fe-In system at 773 K has been constructed by X-ray powder *** known structure ternary compound Er_(12)Fe_(2) In_(3)-type Ho_(12)Fe_(2) In_(3) has been *** the same time,solid solutions are not detected in Ho-Fe-In system at 773 *** magnetic transition and magnetocaloric effect of Ho_(12)Fe_(2.08)In_(2.92) alloy with Er_(12)Fe_(2) In_(3)-type structure were investigated by magnetic susceptibility and isothermal magnetization *** normal antiferromagnetic-paramagnetic transition and another abnormal one are discovered at 18 and 76 K in ground state,*** to a first-order field-induced metamagnetic transition(antiferromagnetic-ferromagnetic) at/below the Neel temperature of 18 K),the negative entropy changes are observed at corresponding *** is only a second-order ferromagnetic-paramagnetic transition near Curie temperature(TC),the maximum entropy change(Δ_(Smax)) values are-6.14 J·kg^(-1)·K^(-1) at 3 K and 7.88 J·kg^(-1)·K^(-1) at 28 K in a field range of 0-7 *** reversible relative cooling power corresponding to negative entropy change can reach about 600 J·kg^(-1) in an wide operating temperature region Δ_(Tcycl)=74 K from 16 to90 K,which suggests that Ho_(12)Fe_(2.08)In_(2.92) could be a potential material for magnetic refrigeration in the corresponding temperature range.

关键词： Re_(3(x+y))(T2)_(x)X_(y)phase Metamagnetic transition Magnetothermal properties Ho-Fe-In alloy

A Difference Hamiltonian Operator and a Hierarchy of Generalized Toda Lattice Equations

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Communications in Theoretical Physics 2005年第1X期44卷 1-7页

作者： XUXi-xiang YANGHong-xiang DINGHai-Yong CollegeofScience ShandongUniversityofScienceandTechnologyQingdao266510China DepartmentofComputerScienceandTechnology TaishanCollegeTaian271021China CollegeofInformationScienceandEngineering ShandongAgricultureUniversityTaian271018China

A difference Ha-miltonian operator with three arbitrary constants is presented. When the arbitrary constants -in the Hamiltonian operator are suitably chosen, a pair of Hamiltonian operators are given. The resulting Hamiltonian pair yields a difference hereditary operator. Using Magri scheme of bi-Hamiltonian formulation, a hierarchy of the generalized Toda lattice equations is constructed. Finally, the discrete zero curvature representation is given for the resulting hierarchy.

关键词： Hamiltonian算子微分函数 Hamiltonian公式遗传算子离散弯曲函数

Post-yielding dislocation retraction of nano-lamellar TiAl single crystals

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Science China(Physics,Mechanics & Astronomy) 2021年第6期64卷 74-82页

作者： HengGao xiang WanLin Guo State Key Laboratory of Mechanics and Conirol of Mechanical Strucures Nanjing University of Aeronautics and AstronauticsNanjing 210016China

The perfect single crystal has ultra-high strength but is often accompanied by catastrophic failures after *** study reveals that nano-lamellar TiAl single crystals alleviate the catastrophic failure due to a post-yielding dislocation retraction through atomistic simulations and theoretical *** dislocation retraction leads to a retained post-yielding strength of1.03 to 2.33 GPa(about 50%of the yielding strength).It is shown that this dislocation retraction is caused by local stress relaxation and interface-mediated image *** local stress relaxation is due to successive dislocation nucleation in different slip systems,and the interface-mediated image force is caused by the heterogeneous *** on dislocation theory,this study demonstrates that the size effect also plays a vital role in dislocation *** modeling shows that the dislocation retraction occurs when the lamellar thickness is less than approximately 12 ***,the post-yielding dislocation retraction is more pronounced at higher temperatures,making it more effective in alleviating catastrophic *** findings demonstrate a viable option for avoiding catastrophic failure of single crystals through nanoscale-lamellar design.

关键词： post-yielding dislocation retraction single crystals nano-lamellar

Prospect Theory and the Newsvendor Problem with Mental Accounting

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Journal of Systems Science and Systems Engineering 2020年第5期29卷 525-536页

作者： Bojun Gu xiang Zhang School of Economics and Management Zhejiang Ocean UniversityZhoushan 316022China School of Management and Economics Beijing Institute of TechnologyBeijing 100081China Sustainable Development Research Institute for Economy and Society of Beijing Beijing 100081China

The manner in which economic outcomes are coded in a value function is critical because it has substantial influence on the evaluation of risky *** this paper,we formulate multiple mental accounts in a nonlinear value function and propose a newsvendor problem with mental accounting to predict and explain pull-to-center *** show that the distinctive predictions of the proposed model come from the value function with mental *** identify the individual and combined effects of loss aversion,risk aversion,and risk seeking on shaping newsvendor ordering *** work demonstrates that prospect theory can explain the decision bias and ordering behavior observed in newsvendor *** also provide some additional insights to explain the studies in the literature.

关键词： Prospect theory mental accounting newsvendor problem decision bias pull-to-center phenomenon

Modeling of Superelastic–plastic Behavior of Porous Shape Memory Alloys Incorporating Void Shape Effects

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Acta Mechanica Solida Sinica 2021年第5期34卷 632-644页

作者： xiang Zhu Guansuo Dui Institute of Mechanics Beijing Jiaotong UniversityBeijing100044China

A new constitutive model for describing the superelastic–plastic behavior of porous shape memory alloys(SMAs)is *** model incorporates the influences of void shape and hydrostatic pressure as well as the elastic modulus mismatch between austenite and *** addition,the interactions between plastic strain and transformation strain are considered via the plastic back *** porous SMAs are considered as two-phase composites with the dense SMA matrix and the second phase representing ellipsoidal *** on Gurson’s formulation,the transformation and plastic flow potentials accounting for the transformation–plasticity coupling are *** numerical results present good agreement with available experimental data for various levels of porosity,which proves that the model is capable of capturing stress-induced phase transformation and plastic deformation of porous *** the proposed model,the influence of plastic strain on reverse transformation and the effects of porosity and void shape on the pseudoelastic and plastic behavior of porous SMAs are investigated.

关键词： Porous shape memory alloys Superelastic–plastic Constitutive model Homogenization

Atomic regulations of single atom from metal-organic framework derived carbon for advanced water treatment

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Nano Research 2023年第7期16卷 10326-10341页

作者： xiang Li Bo Wang Key Laboratory of Cluster Science Ministry of Education Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion MaterialsAdvanced Technologies Research Institute(Jinan)Advanced Research Institute of Multidisciplinary ScienceSchool of Chemistry and Chemical EngineeringBeijing Institute of TechnologyNo.5South StreetZhongguancunHaidian DistrictBeijing 100081China

Single atom(SA)-embedded nitrogen-doped carbon has shown great potential in environmental ***,engineered nanomaterials(ENMs)have attracted great research interests in recent ***-organic framework(MOF)derived SAs show the advantages of tunable topology and averaged separated active *** bridge the gap between homogeneous and heterogeneous *** reaction efficiency can be significantly improved by designing the MOFs derived from carbon and *** this review,the research advanced in MOFs-derived carbon and SAs in advanced oxidation process(AOP)in water were *** strategies to fabricate the SAs derived from MOFs were discussed,including the mixed/single metal strategy,metal-containing linker strategy,pore confinement strategy,thermal diffusion strategy,and pyrolysis MOFs with bulk *** characterization technologies have been introduced,including electron microscopy and spectroscopic *** explain the catalytic mechanism for various applications,the relationship between the performance and the atomic configuration was systematically *** applications of the MOFs derived from carbon and SAs have been summarized.A series of the latest work on effectively removing pollutants by SAs are also *** on the fundamental knowledge and recent practical application of MOFs-derived carbon and SAs,some perspectives on the further directions were *** review offers guidance for applying novel engineered nanomaterials in the water treatment field.

关键词： single-atom catalysts(SACs) engineered nanomaterials(ENMs) metal-organic framework(MOF) MOFs derived carbon water treatment