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Effect of process parameters on properties of Mn1.5CuFe0.5O4 spinel oxide coatings deposited by spray pyrolysis method

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International Journal of Hydrogen Energy 2025年 130卷 213-229页

作者： Mehdizade, Maryam Smeacetto, Federico Winiarski, Michal Molin, Sebastian Advanced Materials Center Faculty of Electronics Telecommunications and Informatics Gdansk University of Technology Gdansk Poland Department of Applied Science and Technology Polytechnic di Torino Italy Applied Physics and Mathematics and Advanced Materials Center Gdansk University of Technology Gdansk Poland

One of the critical issues in the lifetime of metallic interconnects is related to their high oxidation rate and Cr diffusion, which negatively affect their performance. In the present study, a novel Fe modified Mn–Cu spinel oxide with the chemical composition of Mn1.5CuFe0.5O4 as protective coating was deposited on the surface of Crofer 22 APU and alumina by the spray pyrolysis method. The effects of different deposition conditions including deposition temperature, spraying speed, and volume of precursor on the properties of deposited spinel coatings were investigated. Scanning electron microscopy characterizations showed that the deposited layer was uniform and non-cracked at the deposition temperature of 400 °C. However, at temperatures of 300 °C and lower, the deposited layers became non-uniform and cracked. Additionally, spraying with speeds of 10 ml/h and lower resulted in uniform and non-cracked coatings, and a higher spraying speed of 15 ml/h caused a nonuniform and cracked layer. Atomic force microscopy measurements proposed that the value of Ra was reduced by increasing the deposition temperature and reducing the spraying speed. X-ray diffraction characterization showed that deposition temperature has affected the phase structure of deposited spinel oxides on both substrates. According to electrical conductivity measurements, deposited layers at higher deposition temperatures with lower spraying speeds showed higher electrical conductivity and lower activation energy. Decreasing the deposition temperature reduced the electrical conductivity of the spinel oxide coatings. © 2025 The Authors

关键词： Spray pyrolysis

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Interactive issues and strategic solutions for aqueous Zn metal anodes

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Journal of Energy Chemistry 2025年第4期103卷 163-187页

作者： Huifa Shi Sa Han Zhanghao Hou Hongbo Lan Shuzhang Niu Qing Li Shandong Engineering Research Center for Additive Manufacturing Qingdao University of Technology College of New Materials and New Energies Shenzhen Technology University Institute of Applied Physics and Materials Engineering University of Macau

Aqueous zinc(Zn)-ion batteries(ZIBs) have garnered significant attention as promising energy storage devices,primarily due to their low cost,high power density,and excellent safety ***,the commercial viability of these batteries is hindered by several issues related to the Zn metal anode,including dendritic growth,hydrogen evolution reaction(HER),surface corrosion,and *** review delves into the root causes and key factors influencing these challenges from both electrochemical thermodynamics and kinetics ***,viable strategies to mitigate these issues are systematically summarized,including Zn anode reconstruction,artificial solid-electrolyte interphase(SEI)protection,electrolyte formulation optimization,and separator *** research advancements are examined thoroughly,with a focus on the mechanisms behind these approaches and the resulting battery *** review also critically assesses the strengths and limitations of these ***,we highlight crucial research directions aimed at advancing the practical application of Zn metal anodes in future aqueous ZIBs.

关键词： Dendrite growth HER Protection strategies Surface corrosion Zn metal anode

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The High-Order Variable-Coefficient Explicit-Implicit-Null Method for Diffusion and Dispersion Equations

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应用数学与计算数学学报 2025年第1期7卷 115-150页

作者： Meiqi Tan Juan Cheng Chi-Wang Shu Graduate School China Academy of Engineering PhysicsBeijing 100088China Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsBeijing 100088China HEDPS Center for Applied Physics and TechnologyCollege of EngineeringPeking UniversityBeijing 100871China Division of Applied Mathematics Brown UniversityProvidenceRI 02912USA

For the high-order diffusion and dispersion equations,the general practice of the explicit-implicit-null(EIN)method is to add and subtract an appropriately large linear highest derivative term with a constant coefficient at one side of the equation,and then apply the standard implicit-explicit method to the equivalent *** call this approach the con-stant-coefficient EIN method in this paper and hereafter denote it by"CC-EIN".To reduce the error in the CC-EIN method,the variable-coefficient explicit-implicit-null(VC-EIN)method,which is obtained by adding and subtracting a linear highest derivative term with a variable coefficient,is proposed and studied in this *** with the local discon-tinuous Galerkin(LDG)spatial discretization,the VC-EIN method is shown to be uncon-ditionally stable and can achieve high order of accuracy for both one-dimensional and two-dimensional quasi-linear and nonlinear *** addition,although the computational cost slightly increases,the VC-EIN method can obtain more accurate results than the CC-EIN method,if the diffusion coefficient or the dispersion coefficient has a few high and narrow bumps and the bumps only account for a small part of the whole computational domain.

关键词： Diffusion equation Dispersion equation Stability Explicit-implicit-null(EIN)time discretization Local discontinuous Galerkin(LDG)method

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Spin magnetization in unconventional antiferromagnets with collinear and non-collinear spins

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Science China(physics,Mechanics & Astronomy) 2025年第4期68卷 161-170页

作者： Lun-Hui Hu Song-Bo Zhang Center for Correlated Matter and School of Physics Zhejiang UniversityHangzhou 310058China Department of Applied Physics School of ScienceAalto UniversityAalto FI-00076Finland Hefei National Laboratory Hefei 230088China International Center for Quantum Design of Functional Materials(ICQD) University of Science and Technology of ChinaHefei 230026China

Unconventional antiferromagnets(AFMs)with non-relativistic spin-splitting,such as the recently discovered altermagnet,have recently gained significant interest due to their potential for novel quantum phenomena and spintronic *** compensated magnetization in unconventional AFMs is protected by spin-space *** this work,we explore the symmetrybreaking effects and identify three distinct mechanisms for inducing net spin magnetizations in unconventional AFMs with collinear or non-collinear spins:(1)finite size effect,(2)extrinsic spin canting effect,and(3)irradiation with circularly polarized *** show that the induced spin magnetizations are controllable and manifest as diverse intriguing *** the finite size system,the confined direction of a two-dimensional AM creates quantum-well-like subbands that determine the spin *** effect can be experimentally probed by measuring the spin density of states and the spin-polarization of Andreev-bound states within planar Josephson *** the case of spin canting effect,it leads to peculiar anisotropic and non-monotonic behaviors in the superconducting proximity ***,with circularly polarized light,spin magnetization is driven by the polarized light and the chirality of non-collinear magnetic order,thus offering a direct means of detecting the chirality of magnetic order in real *** findings provide valuable insight into understanding and probing the spin magnetization in unconventional AFM materials.

关键词： altermagntism chiral antiferromagnetism Josephson junction light-matter interaction anomalous Hall effect

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A low Mach number asymptotic analysis of dissipation-reducing methods for curing shock instability

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applied Mathematics and Mechanics(English Edition) 2025年第4期46卷 723-744页

作者： Hongping GUO Xun WANG Zhijun SHEN National Key Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsBeijing100088China Faculty of Mathematics Baotou Teachers’CollegeBaotouInner Mongolia Autonomous Region014030China School of Mathematical Sciences Peking UniversityBeijing100871China PKU-Changsha Institute for Computing and Digital Economy Changsha410205China Center for Applied Physics and Technology Peking UniversityBeijing100871China

We are intrigued by the issues of shock instability,with a particular emphasis on numerical schemes that address the carbuncle phenomenon by reducing dissipation rather than increasing *** a specific class of planar flow fields where the transverse direction exhibits vanishing but non-zero velocity components,such as a disturbed onedimensional(1D)steady shock wave,we conduct a formal asymptotic analysis for the Euler system and associated numerical *** analysis aims to illustrate the discrepancies among various low-dissipative numerical ***,a numerical stability analysis of steady shock is undertaken to identify the key factors underlying shock-stable *** verify the stability mechanism,a consistent,low-dissipation,and shock-stable HLLC-type Riemann solver is presented.

关键词： Riemann solver numerical shock instability low Mach number HLLC

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A Novel FDTD-PIC Scheme for Accurate Transient Analysis of Terahertz Gyrotrons

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IEEE Transactions on Terahertz Science and technology 2025年第3期15卷 496-504页

作者： Tang, Runfeng Chen, Xianfei Xie, Liangqian Liu, Weijian He, Chenxi Han, Xiaotao Savilov, Andrei V. Yu Glyavin, Mikhail Xiao, Houxiu Huazhong University of Science and Technology Wuhan National High Magnetic Field Center School of Electrical and Electronic Engineering Wuhan China Russian Academy of Sciences Federal Research Center Institute of Applied Physics Nizhny Novgorod603950 Russia Lobachevsky State University of Nizhny Novgorod Advanced School of General and Applied Physics Nizhny Novgorod603950 Russia

As the resonant frequencies advance into the terahertz regime, the mode competition in the gyrotron becomes increasingly intense, exhibiting atypical and varied transient processes. Consequently, rigorous time-domain simulation is crucial for developing terahertz gyrotrons. Traditional dedicated codes typically utilize the gyro-averaged method to address fast time-scale behaviors. However, this approach may lead to misinterpretation when analyzing transient processes involving modes with different response properties and multi-scale behaviors, such as harmonic and gyro-BWO operations. To address this challenge, this paper directly analyzes the dynamic behavior of various modes based on fast-varying field variables without any time-scale assumption, ensuring a precise depiction of beam-wave interactions. The proposed numerical framework integrates a scalar 1D Finite Difference Time Domain (FDTD) method with a 3D Particle-In-Cell (PIC) algorithm, providing a comprehensive description of full-wave physics. The simplified 1D FDTD model, along with the pre-selection of relevant modes, significantly reduces data storage requirements. A thorough validation of the proposed numerical framework demonstrates that the results align well with those obtained from established dedicated codes, showcasing superior accuracy in transient analysis. © 2011-2012 IEEE.

关键词： Transient analysis

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DISTANCE BETWEEN SPECIES BY CONFUSION OPERATORS OF MULTI-CLASS CLASSIFIERS

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UPB Scientific Bulletin, Series A: applied Mathematics and physics 2025年第1期2025卷 171-182页

作者： Tarbă, Nicolae Irimescu, Ionela N. Pleavă, Ana M. Scarlat, Eugen N. Mihăilescu, Mona Doctoral School Computer Science and Engineering Department Faculty of Automatic Control and Computers National University of Science and Technology POLITEHNICA Bucharest Romania Applied Sciences Doctoral School National University of Science and Technology POLITEHNICA Bucharest Romania CAMPUS Research Center National University of Science and Technology POLITEHNICA Bucharest Romania Physics Dept National University of Science and Technology POLITEHNICA Bucharest Romania Physics Dept Research Center for Applied Sciences in Engineering National University of Science and Technology POLITEHNICA Bucharest Romania

We introduce a method to evaluate the similarities between classes of objects based on the confusion matrices coming from the multi-class machine learning (ML) predictors that operate in the vector space generated by the classes. Operation in the confusion domain allows us to use the distance as evaluation metric of the closeness of the relevant properties carried by the classes. We applied the method to semiquantitatively evaluate the effects of X-ray and carbon ion radiation on cultured SW1353 chondrosarcoma cells with respect to the non-irradiated reference. We prove that it is possible to draw useful information on the strength of cells nuclei changes. © 2025, Politechnica University of Bucharest. All rights reserved.

关键词： Radiation effects

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Kinetics of Rayleigh-Taylor instability in van der Waals fluid:the influence of compressibility

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Frontiers of physics 2025年第1期20卷 269-297页

作者： Jie Chen Aiguo Xu Yudong Zhang Dawei Chen Zhihua Chen National Key Laboratory of Transient Physics Nanjing University of Science and TechnologyNanjing 210094China National Key Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsP.O.Box 8009-26Beijing 100088China State Key Laboratory of Explosion Science and Safety Protection Beijing Institute of TechnologyBeijing 100081China HEDPS Center for Applied Physics and Technologyand College of EngineeringPeking UniversityBeijing 100871China National Key Laboratory of Shock Wave and Detonation Physics Mianyang 621999China School of Mechanics and Safety Engineering Zhengzhou UniversityZhengzhou 450001China

Early studies on Rayleigh−Taylor instability(RTI)primarily relied on the Navier−Stokes(NS)*** research progresses,it becomes increasingly evident that the kinetic information that the NS model failed to capture is of great value for identifying and even controlling the RTI process;simultaneously,the lack of analysis techniques for complex physical fields results in a significant waste of data *** addition,early RTI studies mainly focused on the incompressible case and the weakly compressible *** the case of strong compressibility,the density of the fluid from the upper layer(originally heavy fluid)may become smaller than that of the surrounding(originally light)fluid,thus invalidating the early method of distinguishing light and heavy fluids based on *** this paper,tracer particles are incorporated into a single-fluid discrete Boltzmann method(DBM)model that considers the van der Waals *** using tracer particles to label the matter-particle sources,a careful study of the matter-mixing and energy-mixing processes of the RTI evolution is realized in the single-fluid *** effects of compressibility on the evolution of RTI are examined mainly through the analysis of bubble and spike velocities,the ratio of area occupied by heavy fluid,and various entropy generation rates of the *** is demonstrated that:(i)compressibility has a suppressive effect on the spike velocity,and this suppressive impact diminishes as the Atwood number(At)*** influence of compressibility on bubble velocity shows a staged behavior with increasing.(ii)The impact of compressibility on the entropy production rate associated with the heat flow(S_(NOEF))is related to the stages of RTI ***,this staged impact of compressibility on S_(NOEF)varies with *** exhibits an inhibitory effect on the entropy production rate associated with viscous stresses(S_(NOEF)).(iii)By incorporating the morphological parameter of the pr

关键词： discrete Boltzmann method Rayleigh-Taylor instability compressibility effect tracer particles

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Toward Analytical Homogenized Relaxation Modulus for Fibrous Composite Material with Reduced Order Homogenization Method

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Computers, Materials & Continua 2025年第1期82卷 193-222页

作者： Huilin Jia Shanqiao Huang Zifeng Yuan HEDPS Center for Applied Physics and Technology(CAPT)Department of Mechanics and Engineering SciencePeking UniversityBeijing100871China State Key Laboratory for Turbulence and Complex Systems Peking UniversityBeijing100871China

In this manuscript,we propose an analytical equivalent linear viscoelastic constitutive model for fiber-reinforced composites,bypassing general computational *** method is based on the reduced-order homogenization(ROH)*** ROH method typically involves solving multiple finite element problems under periodic conditions to evaluate elastic strain and eigenstrain influence functions in an‘off-line’stage,which offers substantial cost savings compared to direct computational homogenization *** to the unique structure of the fibrous unit cell,“off-line”stage calculation can be eliminated by influence functions obtained *** the standard solid model to the ROH method enables the creation of a comprehensive analytical homogeneous viscoelastic constitutive *** method treats fibrous composite materials as homogeneous,anisotropic viscoelastic materials,significantly reducing computational time due to its analytical *** approach also enables precise determination of a homogenized anisotropic relaxation modulus and accurate capture of various viscoelastic responses under different loading *** sets of numerical examples,including unit cell tests,three-point beam bending tests,and torsion tests,are given to demonstrate the predictive performance of the homogenized viscoelastic ***,the model is validated against experimental measurements,confirming its accuracy and reliability.

关键词： Homogenized relaxation modulus viscoelastic standard solid model reduced order homogenization fibrous composite material

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Design of a compact beam transport system for laser-driven proton therapy

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Plasma Science and technology 2025年第1期27卷 1-6页

作者： Yangfan LI Xiaofei SHEN Yilin YAO Bin QIAO Graduate School of China Academy of Engineering Physics Beijing 100193People’s Republic of China Center for Applied Physics and Technology HEDPSand SKLNPTSchool of PhysicsPeking UniversityBeijing 100871People’s Republic of China Research Center of Laser Fusion China Academy of Engineering PhysicsMianyang 621000People’s Republic of China Collaborative Innovation Center of IFSA(CICIFSA) Shanghai Jiao Tong UniversityShanghai 200240People’s Republic of China Frontiers Science Center for Nano-optoelectronic Peking UniversityBeijing 100094People’s Republic of China

We put forward a new design of a compact beam transport system for intense laser-driven proton therapy,where instead of using conventional pulsed solenoids,our design relies on a helical coil irradiated by a nanosecond laser pulse to generate strong magnetic fields for focusing protons.A pair of dipole magnets and apertures are employed to further filter protons with large divergences and low *** numerical studies combine particle-in-cell simulations for laser-plasma interaction to generate high-energy monoenergetic proton beams,finite element analysis for evaluating the magnetic field distribution inside the coil,and MonteCarlo simulations for beam transport and energy *** results show that with this design,a spread-out Bragg peak in a range of several centimeters to a deep-seated tumor with a dose of approximately 16.5 cGy and fluctuation around 2% can be *** instantaneous dose rate reaches up to 10^(9)Gy/s,holding the potential for future FLASH radiotherapy research.

关键词： intense laser-plasma interaction laser-driven ion acceleration laser-driven proton acceleration particle-in-cell proton radiotherapy

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