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IEEE Transactions on Computational Imaging 2025年 11卷 399-409页

作者： Wu, Xuelong Wang, Junsheng Zhao, Qingjie Beijing Institute of Technology School of Mechanical Engineering Beijing100081 China Beijing Institute of Technology Advanced Research Institute for Multidisciplinary Science School of Materials Science and Engineering Beijing100081 China Beijing Institute of Technology School of Computer Science Beijing100081 China

Ring artifacts are common artifacts in X-ray Computed Tomography (XCT) scans and have a significant impact on subsequent feature/phase extractions due to the small grayscale gradients in XCT volume data of bulk materials. This paper proposes the Haar Dual Domain Network for correcting ring artifacts. By utilizing the Haar wavelet decomposition on images containing ring artifacts in both the image and projection domains, the ring artifacts are preliminarily separated, facilitating their removal by neural networks while preserving microstructure features such as low-contrast phase boundaries. By constructing a feature fusion network, the information from both 2D slices and 3D projection volume data has been fully integrated to eliminate ring artifacts while preserving the edges of every feature. The effectiveness of the Haar wavelet transform and fusion network has been validated by ablation experiments, proving the application of HDD-Net to large volume of XCT data. © 2015 IEEE.

关键词： Wavelet decomposition

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Precipitation Behavior of MnS Inclusion in Unidirectionally-solidified Fe–18Mn–1Al–0.3C Steels

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Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan 2025年第3期111卷 122-130页

作者： Fan, Yuewen Kameda, Kouki Hu, Xiaojun Matsuura, Hiroyuki State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing China Department of Materials Engineering Graduate School of Engineering The University of Tokyo Japan

In order to reasonably control the precipitation of inclusions during solidification in TWIP steels, the precipitation behavior of typical MnS inclusions in high manganese steel was investigated by unidirectional solidification experiments. Through the combined analyses using ASEM-EDS, optical microscope, and thermodynamic calculation, it was found that Mn concentration in the liquid metal region were higher than those in the solid metal region. Furthermore, closer to the inclusion the liquid phase was, higher its Mn content was. In Fe–18mass%Mn–1Al–0.3C, MnS inclusions can precipitate at the positions located in the junction of dendrites at the end of the solidification (solid fraction fS = 0.96), Mn content reaching 34.88 mass%. Already existing Al2O3 particles could become the core of MnS to form composite inclusions to promote the MnS precipitation during the solidification process. When fS achieved 0.7 leading the Mn segregation in the liquid phase to 25 mass%, MnS starts to precipitate to attach the Al2O3 surface to form composite inclusion. © 2025 The Iron and Steel Institute of Japan.

关键词： Manganese steel

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Homologous CoS2 interface with directed electron transfer and strong chloridion repulsion for efficient seawater oxidation

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Science China Chemistry 2025年第5期68卷 1869-1878页

作者： Yuan Tian Jiang-Bo Chen Jie Ying Ge Tian Yu-Xuan Xiao Yi Lu Si-Ming Wu Wei Geng Ling Shen Xiao-Yu Yang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and School of Materials Science and Engineeringand Shenzhen Research Institute & Laoshan LaboratoryWuhan University of Technology School of Chemical Engineering and Technology Sun Yat-sen University National Energy Key Laboratory for New Hydrogen-Ammonia Energy Technologies Foshan Xianhu Laboratory

Seawater electrolysis is a highly promising method to produce high energy density hydrogen,especially in dry areas that have scarce freshwater ***,application of seawater electrolysis is confronted by two major problems associated with catalysts employed for the anodic oxygen evolution reaction（OER） including the competitive hypochlorite evolution reaction（HCER） and strong chloridion（Cl-） triggered *** studies aimed at overcoming these problems,a facile method has been developed to synthesize a homologous CoS2heterojunction as an OER *** to a difference in work functions at the interface and increased electron density,this material has directed electron transfer and strong chloridion repulsion properties,*** have shown that CoS2achieves low overpotentials of 289 and 322 mV at 10 mA cm-2current density in respective alkaline（1 M KOH） and alkaline simulated seawater ***,the outstanding stability of CoS2is reflected in a negligible decline in activity during promotion of the OER for 100 *** of density functional theory calculations reveal that the homologous CoS2heterojunction promotes directed electron transport for optimizing adsorption/desorption of reactive species and heightens the Cl-adsorption energy for strongly repulsing Cl-,phenomena that enhance OER performance in alkaline simulated seawater.

关键词： metal sulfide homologous heterojunction directed transfer chloride ion repulsion seawater electrolysis

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Improved oxygen electrocatalysis at Fe N_(4)and Co N_(4)sites via construction of axial coordination

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Chinese Chemical Letters 2025年第2期36卷 454-459页

作者： Ze Zhang Lei Yang Jin-Ru Liu Hao Hu Jian-Li Mi Chao Su Bei-Bei Xiao Zhi-Min Ao School of Energy and Power Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China Institute for Computation in Molecular and Materials Science School of Chemistry and Chemical EngineeringNanjing University of Science and TechnologyNanjing 210094China Institute for Advanced Materials School of Materials Science and EngineeringJiangsu UniversityZhenjiang 212013China Advanced Interdisciplinary Institute of Environment and Ecology Beijing Normal UniversityZhuhai 519087China

The quest for efficient and durable catalysts using abundant resources has garnered significant interest in the field of bifunctional oxygen *** this contribution,we have designed a FeN_(4)or CoN_(4)embedded graphene-based bilayer as active layer and TMC_(3)or TMN_(3)doped graphene as supporting layer,named as FeN_(4)/TMC_(3)or FeN_(4)/TMN_(3)and CoN_(4)/TMC_(3)or CoN_(4)/TMN_(3),wherein TM strands for transition *** on density functional theory calculations,our results demonstrate that the interaction formed between dual metal atoms in the bilayer interspace leads to the coordination environment altered from flat four-coordination to spatial five-coordination,further stabilizing the bilayer structure and impairing its affinity toward the O-containing *** to thermodynamic analysis,the bilayers of CoN_(4)/CoN_(3),FeN_(4)/FeC_(3),FeN_(4)/CoC_(3),FeN_(4)/NiC_(3),FeN_(4)/ZnC_(3),FeN_(4)/FeN_(3),FeN_(4)/CrN_(3)and FeN_(4)/ZnN_(3)are attractively promising for bifunctional oxygen electrocatalysis due to the small overpotential differenceΔηbetween oxygen reduction and oxygen evolution that are less than 1 *** functional theory calculations combined with machine learning analysis directly identify the key role played by the interbinding formed between bilayers,that boosts catalytic activity,which establishes a predictable framework for a fast screen for graphene-based bilayer vertical *** work opens up a new path for designing the efficient electrocatalysts via modification of coordination environment.

关键词： Oxygen electrocatalysis Thermodynamic analysis Density functional theory Machine learning

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Understanding thermal hysteresis of ferroelectric phase transitions in BaTiO_(3) with combined first-principle-based approach and phase-field model

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Chinese Physics B 2025年第2期34卷 454-461页

作者： Cancan Shao Houbing Huang Beijing Institute of Technology Zhuhai Beijing Institute of TechnologyZhuhai 519088China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China

Based on the principles of thermodynamics, we elucidate the fundamental reasons behind the hysteresis of spontaneous polarization in ferroelectric materials during heating and cooling processes. By utilizing the effective Hamiltonian method in conjuction with the phase-field model, we have successfully reproduced the thermal hysteresis observed in ferroelectric materials during phase transitions. The computational results regarding the electrocaloric effect from these two different computational scales closely align with experimental measurements. Furthermore, we analyze how the first-order ferroelectric phase transition gradually diminishes with an increasing applied electric field, exhibiting characteristics of second-order-like phase transition. By employing the characteristic parameters of thermal hysteresis, we have established a pathway for calculations across different computational scales, thereby providing theoretical support for further investigations into the properties of ferroelectric materials through concurrent multiscale simulations.

关键词： ferroelectric phase transition thermal hysteresis multiscale simulation effective Hamiltonian phase-field model

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A hierarchical NiFeOOH@CeO_(2−x)nanosheets array boosts electrocatalytic activity and durability at high current densities for water oxidation

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Nano Research 2025年第3期18卷 204-214页

作者： Wei Zhang Liyang Xiao Xiaorui Huang Chunyan Han Ying Liu Jingtong Zhang Haiwen Tan Rui Zhang Pengfei Yin Cunku Dong Hui Liu Xiwen Du Jing Yang Institute of New Energy Materials Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of EducationSchool of Materials Science and EngineeringTianjin UniversityTianjin 300072China

The oxygen evolution reaction(OER)reaction kinetics of nickel-iron(oxy)hydroxides(NiFeOOH)is limited by their weak adsorption of OER ***,a hierarchical NiFeOOH@CeO_(2−x)nanosheets array was in situ grown on a nickel foam by a facile laser direct writing method,which exhibits superior OER activity and durability at high current densities in alkaline *** hierarchical nanosheets array exposes abundant catalytic active sites,which greatly promote OER reaction *** strong electronic interaction at the NiFeOOH/CeO_(2−x)interface leads to favorable electron transfer from Ni^(2+)/^(3+)and Fe^(3+)to Ce^(3+)/^(4+).The Ni sites with high valences show enhanced OH−adsorption and also promote the formation of*OOH intermediate,thereby greatly improving OER intrinsic *** oxygen deficient CeO_(2−x)primary sheets guarantee good electrical *** a well-designed catalytic electrode requires overpotentials of only 229 and 287 mV to achieve current densities of 50 and 500 mA·cm^(−2),respectively,and sustains superior stability at 500 mA·cm^(−2)and 1 A·cm^(−2).

关键词： hierarchical nanosheets transition metal(oxy)hydroxides oxygen evolution reaction laser direct writing water splitting

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Significant increase in thermal conductivity of cathode material LiFePO_(4) by Na substitution:A machine learning interatomic potential-assisted investigation

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Chinese Physics B 2025年第2期34卷 463-468页

作者： Shi-Yi Li Qian Liu Yu-Jia Zeng Guofeng Xie Wu-Xing Zhou School of Materials Science and Engineering Hunan Provincial Key Laboratory of Advanced Materials for New Energy Storage and ConversionHunan University of Science and TechnologyXiangtan 411201China

LiFePO_(4) is a cathode material with good thermal stability,but low thermal conductivity is a critical *** this study,we employ a machine learning potential approach based on first-principles methods combined with the Boltzmann transport theory to investigate the influence of Na substitution on the thermal conductivity of LiFePO_(4) and the impact of Li-ion de-embedding on the thermal conductivity of Li_(3/4)Na_(1/4)FePO_(4),with the aim of enhancing heat dissipation in Li-ion *** results show a significant increase in thermal conductivity due to an increase in phonon group velocity and a decrease in phonon anharmonic scattering by Na *** addition,the thermal conductivity increases significantly with decreasing Li-ion concentration due to the increase in phonon *** work guides the improvement of the thermal conductivity of Li FePO_4,emphasizing the crucial roles of both substitution and Li-ion detachment/intercalation for the thermal management of electrochemical energy storage devices.

关键词： lattice thermal conductivity machine learning potential LiFePO_(4)

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Optimal Feedback Bit Allocation for MU-MIMO Systems Combined With OFDM in Cellular Networks

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IEEE Transactions on Vehicular technology 2025年第5期74卷 8425-8430页

作者： Kim, Jeongbin Min, Moonsik Korea Advanced Institute of Science and Technology School of Electrical Engineering Daejeon34141 Korea Republic of Kyungpook National University School of Electronic and Electrical Engineering Daegu41566 Korea Republic of

In this correspondence, we investigate the performance of multiuser multiple-input and multiple-output (MU-MIMO) systems in cellular networks using Poisson point process (PPP) models. Focusing on limited- feedback-based MU-MIMO combined with orthogonal frequency division multiplexing (OFDM), we aim to maximize the sum rate of users in wide-band cellular networks. To achieve this, we formulate a centralized feedback bit allocation problem and propose an approximation for the instantaneous signal-to-interference-plus-noise ratio (SINR), as it is difficult to obtain accurately at the transmitter. Using Karush-Kuhn-Tucker (KKT) conditions, we derive closed-form solutions for optimal feedback bit allocation. Our results demonstrate significant performance improvements compared to conventional equal feedback bit allocation, providing practical insights for enhancing the spectral efficiency of wideband communication systems in cellular networks. © 1967-2012 IEEE.

关键词： Orthogonal frequency division multiplexing

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Copper Precipitation Behavior and Mechanical Properties of Cu‑Bearing Ferritic Stainless Steel with Diferent Cr Addition

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Acta Metallurgica Sinica(English Letters) 2025年第3期38卷 383-395页

作者： Yifan Li Shengyao Ma Xinrui Zhang Tong Xi Chunguang Yang Hanyu Zhao Ke Yang Henan Institute of Advanced Technology Zhengzhou UniversityZhengzhou 450001China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China

The microstructure evolution and mechanical properties of Cu-bearing ferritic stainless steel with diferent Cr addition(Cr=12,15 and 17 wt%)were *** phase transformation behavior under diferent cooling rate,Cu-rich precipitation behavior and its infuence on the mechanical properties under diferent aging treatment are systematically characterized using dilatometry,diferential scanning calorimeter(DSC)and transmission electron microscopy(TEM).The results indicated that the increase in Cr content narrowed the austenite phase region at high temperatures,afecting its microstructure under diferent cooling *** 12Cr-1.5Cu steel exhibited a fully austenitic phase region at high temperature and occurred apparent martensitic transformation after air *** rate signifcantly infuenced the phase transition of the steels,and subsequently afected its mechanical *** three investigated steels showed higher strength and lower plasticity in air cooling condition compared to furnace cooling condition,due to the presence of *** aging treatment,high number densities of Cu-rich precipitates were formed in steel matrix and the size of Cu-rich precipitates increased obviously with increasing aging temperature,while the tendency for number density was *** and dispersed Cu-rich precipitates formed during low-temperature aging enhanced strength of the steels,while larger Cu-rich phases developed during high-temperature aging endowed greater ductility to the ***,the Cr content had no signifcant efect on the precipitation behavior of Cu-rich *** comprehensive results and analyses could provide a solid foundation for broader applications of Cu-bearing ferritic stainless steels.

关键词： Cu-bearing stainless steel Mechanical property Cu-rich precipitate Microstructure

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A numerical method for predicting bursting strength of composite rocket motor case considering filament winding process-induced stress

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Chinese Journal of Aeronautics 2025年第2期38卷 505-518页

作者： Jiqiu LIANG Fei ZHAO Dan WU Anxin DING Hubei Key Laboratory of Advanced Aerospace Propulsion Technology Wuhan 430040China System Design Institute of Hubei Aerospace Technology Academy Wuhan 430040China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

A numerical method to predict the bursting strength of filament wound composite rocket motor case is proposed *** method can evaluate the longitudinal stress evolution of each composite layer as impregnated filaments with fiber tension are wound layer by layer,and consider the effects of accumulated stress and deformation during filament winding on the bursting strength of composite ***∅520 mm composite cases as a case study,the filament-winding-process-induced stress and deformation as well as progressive damage behavior are numerically predicted,followed by a comparison with experimental *** numerical results show that the predicted bursting pressures for composite cases manufactured on the mandrels with and without a flexible component are 14.20 MPa and 21.40 MPa,*** values exhibit slight deviation from the measured pressures of 13.50 MPa and 21.57 ***,the predicted damage locations,situated respectively in the dome and cylinder,agree well with the experimental *** observations indicate that use of flexible component reduces the load-bearing capacity of the ***,it validates the reliability and accuracy of the proposed numerical method in predicting the bursting strength of composite cases.

关键词： Composite case Fiber tension Bursting strengt hProgressive damage analysis Filament winding

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