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2023 IEEE International Magnetic Conference - Short Papers, INTERMAG Short Papers 2023

作者： Hosokawa, Akihide Hirayama, Yusuke National Institute of Advanced Industrial Science and Technology Magnetic Powder Metallurgy Research Center Aichi Nagoya463-8560 Japan

ISBN: (纸本)9798350338362

Sm2Fe17N3 coarse powder was directly consolidated into a disc magnet by the high-pressure torsion technique. The huge superimposed hydrostatic pressure above several GPa enables to apply large plastic strain to the disc as well as the powder particles of the brittle Sm2Fe17N3 compound at room temperature. This large deformation successfully increased the relative density to 98% at room temperature, inducing the grain subdivision inside powder particles simultaneously. This led to the coercivity of 5.7 kOe enhanced from the coarse powder having the coercivity of 1 kOe without reducing the particle size. It was found that those grain subdivision events are accompanied by the motion of dislocations on non-basal planes. Synchrotron X-ray diffractometry was also performed and revealed that too large strain, however, results in the disappearance of the hard magnetic Sm2Fe17N3 phase and the loss of the coercivity. © 2023 IEEE.

关键词： Synchrotron radiation

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Integration of Knowledge Bases and External Information Sources via Magic Properties and Query-Driven Entity Linking 25th

Integration of Knowledge Bases and External Information So...

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25th International Conference on Information Integration and Web Intelligence, iiWAS 2023

作者： Ohmroi, Yuuki Kitagawa, Hiroyuki Amagasa, Toshiyuki Matono, Akiyoshi University of Tsukuba Tsukuba Japan Artificial Intelligence Research Center National Institute of Advanced Industrial Science and Technology Tokyo Japan

ISBN: (纸本)9783031483158

A knowledge base (KB) accumulates human knowledge in resource description framework (RDF), which forms a knowledge graph consisting of subject-predicate-object triples. Although RDF KBs are essential information sources for various knowledge processing, many non-RDF information sources exist. Therefore, integrating RDF KBs and external sources will be beneficial in supporting various applications. However, external sources have diverse access methods and input/output formats. In addition, their integration with the KB involves identifying correct entities which correspond to objects in the external sources, which is challenging. In this paper, we present an architecture for an integrated environment (named Knowledge Mediator) in which the user can query the KB as if external sources were an integral part using the Magic Properties of SPARQL. We also propose novel query-driven on-demand entity linking, to select correct entities in the KB for objects in the external sources. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Data integration

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A fast MGAWE method based on MORe 24

A fast MGAWE method based on MORe

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24th International Vacuum Electronics Conference, IVEC 2023

作者： Li, Xing Xu, Li Liao, Li Yin, Junhui Li, Bin School of Electronic Science and Engineering University of Electronic Science and Technology of China Chengdu610054 China Shenzhen Institute for Advanced Study UESTC Shenzhen China

ISBN: (纸本)9781665473217

Microwave equipment often needs to get some electromagnetic parameters so that better designs and simulations. At present, transmission parameters of microwave tube can be obtained by fast frequency sweep technologies. Although the traditional multipoint Galerkin asymptotic waveform evaluation (MGAWE) is very popular, it exists some insufficient on the large frequency band and derivation. To remedy the above problems, this paper proposed a fast MGAWE method based on Model Order Reduction (MORe) technology and vector finite element method (FEM). For the global matrix function of FEM, we apply Chebyshev function approximation instead of Taylor expansion, which can avoid derivation. Then we define two error determinations so that can adaptively divide the whole frequency band. To verify the reliability and accuracy of the proposed method, numerical examples are simulated. The results show that this proposed method is in good agreement with HFSS software, which illustrate that the proposed method is effective and feasible. © 2023 IEEE.

关键词： Finite element method

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High Thermal Conductive Liquid Metal/Hydroxy Silicone Oil Thermal Grease with Anti-Leakage

High Thermal Conductive Liquid Metal/Hydroxy Silicone Oil Th...

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International Conference on (ICEPT) Electronic Packaging technology

作者： Junjie Chen Jiuyang Wang Shutong Wang Yimin Wei Xiaoliang Zeng Zhenwei Yu Rong Sun Shenzhen Institute of Advanced Electronic Materials Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen China Nano Science and Technology Institute University of Science and Technology of China Suzhou China

ISBN: (数字)9798350353808

ISBN: (纸本)9798350353815

With the development of microelectronic devices, miniaturization and high-power density pose new challenges to chip thermal management, effective thermal management during chip packaging is paramount. Thermal grease, as a type of thermal interface material, finds widespread application in the field of electronic packaging. However, there still exist challenges regarding how to further enhance the thermal conductivity of thermal grease and address issues such as filler leakage. Compared to other rigid fillers, eutectic gallium-indium alloy offers unique advantages as a filler in manufacturing high-performance thermal interface materials, meeting the required thermal and mechanical behaviors. Here, we present a thermal grease prepared by blending hydroxy silicone oil with eutectic gallium-indium alloy, characterized by high thermal conductivity and non-corrosiveness. Experimental investigations into the thermal properties and rheological behavior of this thermal grease, along with analyses of its surface and internal structure, elucidate its mechanisms. It is evident that liquid metal/polymer thermal grease holds vast potential in the realm of chip packaging.

关键词： Liquids Oils Metals Conductivity Packaging Electronic packaging thermal management Thermal conductivity

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INTEGRATING URBAN AIR MOBILITY WITH HIGHWAY INFRASTRUCTURE: A STRATEGIC APPROACH FOR VERTIPORT LOCATION SELECTION IN THE SEOUL METROPOLITAN AREA

arXiv

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arXiv 2025年

作者： Yoon, Donghyun Jeong, Minwoo Lee, Jinyong Kim, Seyun Yoon, Yoonjin Graduate School of Artificial Intelligence Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of Graduate School of Data Science Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of Graduate School of Innovation and Technology Management Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of Department of Civil and Environmental Engineering Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of

This study focuses on identifying suitable locations for highway-transfer Vertiports to integrate Urban Air Mobility (UAM) with existing highway infrastructure. UAM offers an effective solution for enhancing transportation accessibility in the Seoul Metropolitan Area, where conventional transportation often struggle to connect suburban employment zones such as industrial parks. By integrating UAM with ground transportation at highway facilities, an efficient connectivity solution can be achieved for regions with limited transportation options. Our proposed methodology for determining the suitable Vertiport locations utilizes data such as geographic information, origin-destination volume, and travel time. Vertiport candidates are evaluated and selected based on criteria including location desirability, combined transportation accessibility and transportation demand. Applying this methodology to the Seoul metropolitan area, we identify 56 suitable Vertiport locations out of 148 candidates. The proposed methodology offers a strategic approach for the selection of highway-transfer Vertiport locations, enhancing UAM integration with existing transportation systems. Our study provides valuable insights for urban planners and policymakers, with recommendations for future research to include real-time environmental data and to explore the impact of Mobility-as-a-Service on UAM operations. Copyright © 2025, The Authors. All rights reserved.

关键词： Travel time

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STXD: structural and temporal cross-modal distillation for multi-view 3D object detection 23

STXD: structural and temporal cross-modal distillation for m...

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Proceedings of the 37th International Conference on Neural Information Processing Systems

作者： Sujin Jang Dae Ung Jo Sung Ju Hwang Dongwook Lee Daehyun Ji Samsung Advanced Institute of Technology (SAIT) Korea Advanced Institute of Science and Technology (KAIST)

3D object detection (3DOD) from multi-view images is an economically appealing alternative to expensive LiDAR-based detectors, but also an extremely challenging task due to the absence of precise spatial cues. Recent studies have leveraged the teacher-student paradigm for cross-modal distillation, where a strong LiDAR-modality teacher transfers useful knowledge to a multi-view-based image-modality student. However, prior approaches have only focused on minimizing global distances between cross-modal features, which may lead to suboptimal knowledge distillation results. Based on these insights, we propose a novel structural and temporal cross-modal knowledge distillation (STXD) framework for multi-view 3DOD. First, STXD reduces redundancy of the feature components of the student by regularizing the cross-correlation of cross-modal features, while maximizing their similarities. Second, to effectively transfer temporal knowledge, STXD encodes temporal relations of features across a sequence of frames via similarity maps. Lastly, STXD also adopts a response distillation method to further enhance the quality of knowledge distillation at the output-level. Our extensive experiments demonstrate that STXD significantly improves the NDS and mAP of the based student detectors by 2.8% ~ 4.5% on the nuScenes testing dataset.

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High-Quality Single Crystal of Kitaev Spin Liquid Candidate Material RuBr_(3) Synthesized under High Pressure

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Chinese Physics Letters 2025年第2期42卷 249-254页

作者： Bowen Zhang Xiangjun Li Limin Yan Wenbo Li Nana Li Jianfa Zhao Xiaobing Liu Shun-Li Yu Zhiwei Hu Wenge Yang Runze Yu Center for High-Pressure Science and Technology Advanced Research Beijing 100093China Laboratory of High-Pressure Physics and Material Science School of Physics and Physical EngineeringQufu Normal UniversityQufu 273165China Institute of Physics Chinese Academy of SciencesBeijing 100190China National Laboratory of Solid-State Microstructures and Department of Physics Nanjing UniversityNanjing 210093China Max-Planck Institute for Chemical Physics of Solids Dresden 01187Germany

Kitaev quantum spin liquids have attracted significant attention in condensed matter physics over the past *** understand their emergent quantum phenomena,high-quality single crystals of substantial size are ***,we report the synthesis of single crystals of the Kitaev quantum spin liquid candidate RuBr_(3),achieving millimeter-sized crystals through a self-flux method under high pressure and high temperature *** crystals exhibit well-defined cleavage planes with a lustrous *** characterizations exhibit a narrow band-gap semiconducting behavior with 0.13 eV and 0.11 eV band-gap in ab plane and along𝑐axis,*** measurement shows a transition to antiferromagnetic(AFM)state at approximately 29K both in ab plane and along the c ***,the N′eel temperature increases to 34K with an applied magnetic field of up to 7T in the ab plane,but without any change along𝑐*** large size and high quality of RuBr3 single crystals provide a valuable platform for investigating various interactions,particularly the Kitaev interaction,and for elucidating the intrinsic physical properties of Kitaev quantum spin liquids.

关键词： quantum narrow sized

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Toward a comprehensive hypothesis of oxygen-evolution reaction in the presence of iron and gold

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Journal of Energy Chemistry 2024年第2期89卷 172-183,I0005页

作者： Negah Hashemi Jafar Hussain Shah Cejun Hu Subhajit Nandy Pavlo Aleshkevych Sumbal Farid Keun Hwa Chae Wei Xie Taifeng Liu Junhu Wang Mohammad Mahdi Najafpour Department of Chemistry Institute for Advanced Studies in Basic Sciences(IASBS)Zanjan 45137-66731Iran Center for Advanced Mössbauer Spectroscopy Mössbauer Effect Data CenterDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina Key Lab of Advanced Energy Materials Chemistry(Ministry of Education) Renewable Energy Conversion and Storage CenterCollege of ChemistryNankai UniversityTianjin 300071China Advanced Analysis Center Korea Institute of Science and TechnologySeoul 02792Republic of Korea Institute of Physics Polish Academy of SciencesWarsaw 02-668Poland National and Local Joint Engineering Research Center for Applied Technology of Hybrid Nanomaterials Henan UniversityKaifeng 475004HenanChina Center of Climate Change and Global Warming Institute for Advanced Studies in Basic Sciences(IASBS)Zanjan 45137-66731Iran Research Center for Basic Sciences&Modern Technologies(RBST) Institute for Advanced Studies in Basic Sciences(IASBS)Zanjan 45137-66731Iran

This study investigates the effects of Fe on the oxygen-evolution reaction(OER)in the presence of *** distinct areas of OER were identified:the first associated with Fe sites at low overpotential(~330 mV),and the second with Au sites at high overpotential(~870 mV).Various factors such as surface Fe concentration,electrochemical method,scan rate,potential range,concentration,method of adding K_(2)Fe O_(4),nature of Fe,and temperature were varied to observe diverse behaviors during OER for Fe O_(x)H_(y)/*** amounts of Fe ions had a significant impact on OER,reaching a saturation point where the activity did not increase *** electronic interaction between Fe and Au ions was indicated by X-ray photoelectron spectroscopy(XPS)and electron paramagnetic resonance(EPR)*** situ visible spectroscopy confirmed the formation of Fe O_(4)^(2-)during *** situ Mossbauer and surfaceenhanced Raman spectroscopy(SERS)analyses suggest the involvement of Fe-based species as intermediates during the rate-determining step of OER.A lattice OER mechanism based on Fe O_(x)H_(y)was proposed for operation at low *** functional theory(DFT)calculations revealed that Fe oxide,Fe-oxide clusters,and Fe doping on the Au foil exhibited different activities and stabilities during *** study provides insights into the interplay between Fe and Au in OER,advancing the understanding of OER mechanisms and offering implications for the design of efficient electrocatalytic systems.

关键词： DFT calculation Fe/Au electrocatalysis Mechanism Oxygen evolution Water oxidation

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A novel cobalt-free oxide dispersion strengthened medium-entropy alloy with outstanding mechanical properties and irradiation resistance

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Journal of Materials science & technology 2023年第21期152卷 190-200页

作者： Ao Fu Bin Liu Bo Liu Yuankui Cao Jian Wang Tao Liao Jia Li Qihong Fang Peter K.Liaw Yong Liu State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China Key Laboratory of Radiation Physics and Technology of Ministry of Education Institute of Nuclear Science and TechnologySichuan UniversityChengdu 610064China State Key Lab of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangsha 410082China Department of Materials Science and Engineering The University of TennesseeKnoxvilleTN 37996USA

A novel cobalt-free oxide dispersion strengthened(ODS)equiatomic FeCrNi medium entropy alloy(MEA)was successfully fabricated through mechanical alloying and hot extrusion(HE).The ODS FeCrNi MEA is composed of a single face-centered cubic(FCC)matrix,in which highly dispersed oxide nanoparticles,including Y_(2)Ti_(2)O_(7),Y_(2)TiO_(5) and Y_(2)O_(3),are uniformly *** with the FeCrNi MEA,the ODS FeCrNi MEA exhibits the improved yield strength(1120 MPa)and ultimate tensile strength(1274 MPa)with adequate ductility retention(12.1%).Theoretical analysis of the strengthening mechanism indicates that the high strength is mainly attributed to the grain-boundary strengthening caused by fine grains and the precipitation strengthening resulted from the oxide ***,the matrix that easily activates mechanical twinning during the deformation process is the main reason to ensure moderate *** addition,the introduction of high-density oxide nanoparticles can disperse the defect distri-bution and suppress the defect growth and irradiation-induced segregation,leading to the excellent irra-diation *** findings provide innovative guidance for the development of high-performance structural materials for future nuclear energy applications with balanced strength and ductility.

关键词： Medium-entropy alloys Irradiation Oxide nanoparticles Strength Deformation mechanism

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Nitrogen-doping assisted local chemical heterogeneity and mechanical properties in CoCrMoW alloys manufactured via laser powder bed fusion

Advanced Powder Materials

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advanced Powder Materials 2024年第5期3卷 46-57页

作者： Wenting Jiang Ruidi Li Junyang He Song Ni Li Wang Zibin Chen Yi Huang Caiju Li Jianhong Yi Min Song State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China College of Materials and Advanced Manufacturing Hunan University of TechnologyZhuzhou 412007China Research Institute for Advanced Manufacturing Department of Industrial and Systems EngineeringThe Hong Kong Polytechnic UniversityHong KongChina Department of Design and Engineering Faculty of Science and TechnologyBournemouth UniversityPooleDorsetBH125BBUK Materials Research Group Department of Mechanical EngineeringUniversity of SouthamptonSouthamptonSO171BJUK Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China

CoCrMoW alloys with different nitrogen(N)additions(0,0.05,0.1,and 0.2 wt%)were prepared via laser powder bed fusion(LPBF).The effects of N content on the microstructure and mechanical properties were *** results indicate that the LPBFed CoCrMoW alloy with 0.1 wt%N addition(0.1 N alloy)shows the best combination of mechanical properties with a yield strength of~983 MPa and an elongation of~19%.Both the LPBF process and the N addition impose great effects on suppressing theγtoεmartensitic transformation,resulting in a decrease in the width and amount ofεlaths/stacking ***,the N addition promotes the segregation of elements Mo,W,and Si along the cellular sub-grain boundaries(CBs),forming fine and discontinuous precipitates rich in Mo,W and Si along the CBs in the 0.1 N alloy,but dense and continuous(Mo,W)5Si_(3)precipitates along the CBs in the 0.2 N ***(Mo,W)5Si_(3)precipitates with a tetragonal structure were observed and characterized for the first time in the Co-Cr based *** negative mixing enthalpy between the non-metallic elements N,Si and the metallic elements Mo,W,Cr,and the rapid solidification induced segregation of high melting point elements such as Mo and W along CBs during LPBF process,synergistically contribute to the chemical heterogeneity in the *** pure FCC matrix,the slightly increased segregation of Mo,W,Si elements and fine precipitates along the CBs contribute to the good combination of strength and elongation of the 0.1 N ***,though pure FCC phase was present in the 0.2 N alloy,the dense and continuous(Mo,W)5Si_(3)precipitates along CBs acted as nucleation sites for cracks,deteriorating the elongation of the ***,it is possible to tune the mechanical properties of the LPBFed CoCrMoW alloy by adjusting the local chemical heterogeneity.

关键词： CoCrMoW alloy Laser powder bed fusion Nitrogen addition Mechanical properties Precipitation behaviors

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