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Extreme sputtering:Epitaxy of multifunctional oxides heterostructures

Journal of advanced Ceramics 2024年第12期13卷 1919-1930页

作者： Soo Young Jung Dong-Hun Han Ruiguang Ning Min-Seok Kim Hyung-Jin Choi Ho Won Jang Seung-Hyub Baek Electronic Materials Research Center Korea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Department of Materials Science and Engineering Research Institute of Advanced MaterialsSeoul National UniversitySeoul 08826Republic of Korea Division of Nano&Information Technology KIST SchoolUniversity of Science and TechnologySeoul 02792Republic of Korea Advanced Institute of Convergence Technology Seoul National UniversitySuwon 16229Republic of Korea

This review provides an in-depth exploration of low-damage sputtering techniques and their importance in synthesizing high-quality epitaxial multifunctional oxide *** review examines the factors contributing to damages during sputtering and introduces strategies for minimizing these detrimental *** examples are provided to illustrate key milestones in the development of the sputtering technique,addressing critical issues such as maintaining stoichiometry when volatile species are included,achieving precise atomic-level control of interfaces,integrating an additional anion into oxides,selecting a particular phase from many possible polymorphs,and controlling the microstructure of thin ***,various defect mitigation strategies are discussed,including the use of miscut substrates,in-situ monitoring systems,and chemical buffer *** shedding light on the advancements and limitations in sputtering,this review not only enhances our present understanding of thin film deposition but also paves the way for future innovative sputtering techniques,holding tremendous potential for the exploration of new materials and their applications in various industries.

关键词： sputtering low damage ion bombardment epitaxial thin films functional oxides

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Unravelling precipitation behavior and mechanical properties of Al-Zn-Mg-Cu alloy

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Journal of Materials science & technology 2025年第1期204卷 177-189页

作者： Sang-Hwa Lee Tae-Young Ahn Sung-Il Baik David NSeidman Seok-Jae Lee Young-Kook Lee Kwangjun Euh Jae-Gil Jung Division of Advanced Materials Engineering Jeonbuk National UniversityJeonju54896Republic of Korea Advanced Metals Division Korea Institute of Materials ScienceChangwon51508Republic of Korea Department of Materials Science and Engineering Yonsei UniversitySeoul03722Republic of Korea Materials Safety Research Division Korea Atomic Energy Research InstituteDaejeon34057Republic of Korea Department of Materials Science and Engineering Northwestern UniversityEvanstonIL60208USA Northwestern University Center for Atom-probe Tomography EvanstonIL60208USA Research Center for Advanced Materials Development Jeonbuk National UniversityJeonju54896Republic of Korea Graduate Institute of Ferrous&Eco Materials Technology Pohang University of Science and TechnologyPohang37673Republic of Korea

We investigate the effect of aging temperature on precipitation behavior and mechanical properties of an Al-7.6Zn-2.7Mg-2.0Cu-0.1Zr-0.07Ti(wt.%)alloy by evaluating the matrix’s microhardness,electrical resistivity,and tensile properties:additionally,employing X-ray diffraction(XRD),differential scanning calorimetry(DSC),transmission electron microscopy(TEM),and atom-probe tomography(APT)to charac-terize this *** nanoprecipitates forming under peak-aging conditions vary with aging temperature,forming coherent GPI zones at 80℃,GPII zones with minorη’at 120-150℃,andη’/ηwith minor GP zones at 180-220℃.GPI and GPII zones forming at 80-150℃ contain similar concentrations of solute atoms(11Zn-9Mg-(<1.0)Cu(at.%)),whereas theη’/ηnanoprecipitates forming at 180℃ contain larger concentrations of solute atoms(28Zn-24Mg-3.4Cu(at.%)).The strength of the peak-aged alloy decreases with increasing aging temperature owing to the increasing size and decreasing number density of the *** peak-aging conditions,precipitation strengthening originates mainly from dislo-cation shearing at 80-150℃ and from Orowan bypassing at temperatures above 180℃.The shearable to non-shearable transition of the nanoprecipitates at 180℃ reduces the strain hardening rate,thereby decreasing the alloy’s ductility.

关键词： Aluminum alloys Precipitation Tensile properties Transmission electron microscopy Atom probe tomography

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Spin freezing induced giant exchange bias in a doped Hund's metal

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science China(Physics,Mechanics & Astronomy) 2025年第2期68卷 167-174页

作者： Shunjiao Li Dan Zhao Jian Li Baolei Kang Min Shan Yanbing Zhou Xuyang Li Tao Wu Xianhui Chen Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China CAS Key Laboratory of Strongly Coupled Quantum Matter Physics Department of PhysicsUniversity of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Superconducting Electronics(CENSE) Shanghai 200050China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China

Exchange bias(EB)is a fundamental phenomenon in widespread information ***,a comprehensive understanding of its microscopic origin remains a great *** key issue in the debate is the role of frustration and disorder in the EB mechanism,which motivates the exploration of the EB effect in spin glass(SG)***,in the SG state of Crdoped Hund's metal CsFe_(2)As_(2),we discover a giant EB effect with a maximum bias field of -2 T,which is almost two orders of magnitude larger than that of traditional alloy *** results indicate that the giant EB effect should originate from the exchange interactions at the natural boundaries between the tunable ferromagnetic-like(FM)regions around Cr dopants and the SG matrix,via which the FM spins are strongly pinned by the frozen spins in the SG *** addition,the temperaturedependent and cooling-field-dependent EB behaviors could be interpreted well by the SG model with frustrated FM/SG boundaries,which provides an intuitive and explicit understanding of the impact of glassy parameters on the EB *** these results suggest that the correlated metals are promising directions for exploring the EB effect in the SG state.

关键词： Hund's metal spin glass exchange bias iron-based superconductor

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Exploring Non-Contact Ultrasound technology Based on Terahertz Photoacoustic Effect

Exploring Non-Contact Ultrasound Technology Based on Teraher...

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2025 International Conference on Mobile and Miniaturized Terahertz Systems, ICMMTS 2025

作者： Monnai, Yasuaki The University of Tokyo Research Center for Advanced Science and Technology Tokyo Japan

ISBN: (纸本)9798350365832

We review our recent exploration of non-contact ultrasound technology based on the terahertz photoacoustic effect. Since terahertz waves are highly attenuated in water, irradiating the surface of a water-containing object with modulated terahertz waves can generate ultrasound without physical contact. Hence, by delivering terahertz waves to the skin, ultrasound is generated inside the body. Although this approach still requires a significant increase in acoustic pressure to become fully practical, it has the potential to make ultrasound technology contactless. Unlike conventional in-vivo ultrasound applications, which require a transducer to be in close contact with the skin, this method could expand application opportunities. While ultrasound applications are often confined to controlled environments such as laboratories and hospitals, the proposed approach could make them as easy and versatile as the wireless technology, expanding potential applications in health monitoring, sports training, and brain science and engineering. © 2025 IEEE.

关键词： non-contact Terahertz photoacoustics ultrasound

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Improved Engine Data Acquisition System and Interface to Enable Experimentation With Emerging Alternative Fuels in a Spark-Ignited Cooperative Fuel research Engine

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Journal of Engineering for Gas Turbines and Power 2025年第7期147卷 071020页

作者： Loprete, Jason Dimosthenous, Christos Assanis, Dimitris Department of Mechanical Engineering Advanced Energy Research and Technology Center Stony Brook University Stony BrookNY11794 United States Institute for Advanced Computational Science Stony Brook University Stony BrookNY United States

In the face of new engine research challenges, legacy hardware and once state-of-the-art assumptions may become less relevant, especially those made due to the computational limitations of the hardware at the time of initial development. Such legacy elements can potentially limit the effectiveness of accurately describing key parameters or metrics during experimentation or postprocessing. As the behavior of novel fuels is also not always fully understood, this highlights the need for tools to guide the experimental design to avoid unexpected and potentially dangerous outcomes. This paper details the conversion of an existing data acquisition system for a spark-ignited single-cylinder cooperative fuel research (CFR) engine to handle a variety of different emerging alternative fuels. Modifications to the in-house legacy LabVIEW program and data acquisition system are detailed, with emphasis on providing additional tools to aid in the experimentation expediency and safety. The existing CFR testing facility is converted from a single liquid or single gaseous fuel capable system to a multifuel compatible system, complete with on-the-fly calculations of mass, energy, and volume fractions of existing fuel blends, increased low-speed sampling rates, and a calculating tool to command fuel flow set-points for a given blend fraction, equivalence ratio and airflow set-point. Additional factors, such as sensor selection and communication, are discussed with an emphasis on reducing experimental uncertainty. Overall, this work provides insights into possible adjustments and considerations when upgrading existing experimental setups to accommodate emerging alternative fuel use. Copyright © 2025 by ASME.

关键词： Alternative fuels

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Glycidyl Carbamate Resins Synthesized through a Nonphosgene Route by Amidine-Based Superbases Using Recycled Polycarbonate

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ACS Sustainable Chemistry and Engineering 2023年第51期11卷 17907-17919页

作者： Hsu, Shu-Wei Huang, Ying-Chi Wu, Chien-Hsin Jeng, Ru-Jong Institute of Polymer Science and Engineering National Taiwan University Taipei10617 Taiwan Advanced Research Center for Green Materials Science and Technology Taipei10617 Taiwan

In this study, a ring-opening reaction of epoxide groups toward phenolic was proposed for obtaining glycidyl carbamate resins (GC resins) derived from waste polycarbonate (wPC) products, such as waste bottles. The wPC was first granulated, decolorized, and filtered, leading to wPC solution in anisole (yield = 98%). In the next step of the chemical recycling procedure, the wPC was fully converted into a raw material for producing GC resins. Through model reactions, a catalytically selective ring opening of epoxide groups toward phenol or carbamate groups was found. Therefore, to determine the appropriate reaction conditions such as reaction temperature, heating time, and catalytic conditions, differential scanning calorimetry was used to investigate the exothermic reactions. Initially, wPC was aminolyzed into hydroxyl-N,N′-diphenylene-isopropylidenyl biscarbamates as interim products, which were then subjected to ring opening of epoxide groups to produce diglycidyl-N,N′-diphenylene-isopropylidenyl biscarbamates (GC resins) in the presence of the amidine-based catalyst 1,5-diazabicyclo[4.3.0]non-5-ene. This approach provides not only a waste disposal solution, but also a nonphosgene route for the synthesis of carbamate. These GC resins were capable of self-curing to result in new polymer products with superior properties, such as high tensile strengths (>80 MPa) and large elongations at break (>200%), as measured in tensile tests. © 2023 American Chemical Society

关键词： Resins

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Experimental and Numerical Study on the Trailing Edge Cutback Cooling Characteristics with POD Analysis

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Journal of Thermal science 2025年第3期34卷 834-849页

作者： LIU Jiajie WANG Pengfei WANG Pei LIU Jun DU Qiang WANG Haohan WANG Zhiguo SHEN Xin ZHU Junqiang Key Lab of Light-duty Gas-turbine Institute of Engineering TermophysicsChinese Academy of Sciences University of Chinese Academy of Sciences National Key Laboratory of Science and Technology on Advanced Light-duty Gas-turbine Research Center of Fluid Machinery Engineering and Technology Jiangsu University

This paper investigates the film cooling characteristics and flow structure of trailing edge cutback in turbine vanes,and explains the unsteady flow mixing mechanism of this cooling structure using Proper Orthogonal Decomposition（POD） *** Delayed Detached Eddy Simulation（DDES） turbulence model was used to obtain detailed information about the velocity and temperature field for the POD *** verify the accuracy of the numerical results,fast-response Pressure Sensitive Paint（PSP） and high-frequency Particle Image Velocimetry（PIV） experiments were also conducted,and the results achieved good *** the blowing ratio increases,the effectiveness η of the cutback's film cooling exhibits a "increase-decrease-increase" trend,with η reaching its minimum point at around a blowing ratio(Mslot) of *** kinds of coherent vortex structures are observed in the flow field at different blowing *** to the analysis using the POD method,the first and second order modes of a Karman-like vortex street are observed in the vicinity of the wall at various blowing *** coherent flow structure is directly related to the mixing intensity between the mainstream gas and the *** Mslot=0.75,these modes had the highest energy ratio and formed a stable dominant coherent structure in the flow *** the blowing ratio increases,the main characteristic modes in the temperature field gradually change,and the mode appears crescent-shaped when the effectiveness of film cooling is at its *** paper combines the vortex structure of the flow field to explain the flow field feature distribution at the lowest effectiveness point η and analyzes its impact on the film cooling characteristics of the protected surface.

关键词： film cooling Proper Orthogonal Decomposition (POD) shedding vortices trailing edge cutback unsteady flow mixing

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Effect of La on the Corrosion Behavior and Mechanism of 3Ni Weathering Steel in a Simulated Marine Atmospheric Environment

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Acta Metallurgica Sinica(English Letters) 2024年第2期37卷 308-324页

作者： Gang Niu Rui Yuan R.D.K.Misra Na Gong Zhi-Hui Zhang Hao-Xiu Chen Hui-Bin Wu Cheng-Jia Shang Xin-Ping Mao Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing100083China Laboratory for Excellence in Advanced Steel Research Department of MetallurgicalMaterials and Biomedical EngineeringUniversity of Texas at El PasoEl PasoTX79968USA Institute of Materials Research and Engineering Agency for ScienceTechnologyand ResearchSingapore138634Singapore Department of Materials Science and Engineering University of TorontoTorontoONM5S 3E4Canada

The corrosion behavior and mechanism of 3Ni weathering steel in a simulated oceanic atmospheric environment are investigated in order to comprehend the impacts of La,as determined through electrochemical analysis and rust layer *** results of this study demonstrate that the addition of La enhances the corrosion resistance of 3Ni weathering steel in the marine atmospheric environment,thereby reducing the corrosion rate and improving the protection of the rust *** influence of La on corrosion resistance can be attributed to two primary ***,La functions as a grain refiner,minimizing the potential difference of the micro-regions on the substrate surface,thereby significantly reducing the corrosion of bare steel in the marine ***,La inhibits the process of Fe_(3)O_(4) oxidation back toγ-FeOOH during corrosion at the local site,thus decreasing the formation ofγ-FeOOH and enhancing the charge transfer *** research work may serve as a reference for expanding the application of rare earth elements in the field of weathering steel.

关键词： Weathering steel Rare earth Rust layer Corrosion behavior Corrosion resistance

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ABMs in Game Approach for Physics Learning

ABMs in Game Approach for Physics Learning

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2023 IEEE International Conference on Agents, ICA 2023

作者： Zhu, Chenkai Gu, Wen Ota, Koichi Hasegawa, Shinobu Graduate School of Advanced Science and Technology Japan Advanced Institute of Science and Technology Ishikawa Japan Center for Innovative Distance Education and Research Japan Advanced Institute of Science and Technology Ishikawa Japan

ISBN: (纸本)9798350312782

In recent years, there has been significant research conducted on the integration of game approach into education, particularly focusing on the utilization of Agent-based models (ABMs). These ABMs have gained prominence due to the advancement of computational technology, offering a flexible and creative approach to reshape science education. This study delves into the application of ABM technology within fundamental scientific learning games, aiming to explore the effects of incorporating ABMs into the game approach for learning of physics. Through this investigation, the potential transformational influence of ABMs on enhancing the game approach of physics education is examined. © 2023 IEEE.

关键词： Autonomous agents

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Interstitial carbon induces enriched Cu^(δ+) sites in Cu_(2)O nanoparticles to facilitate CO_(2) electroreduction to C_(2+) products

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Nano research 2024年第8期17卷 7013-7019页

作者： Haoran Wang Rongbo Sun Peigen Liu Haohui Hu Chen Ling Xiao Han Yi Shi Xusheng Zheng Geng Wu Xun Hong Center of Advanced Nanocatalysis(CAN) Department of Applied ChemistryHefei National Laboratory for Physical Sciences at the MicroscaleUniversity of Science and Technology of ChinaHefei 230026China Sinochem Holdings Co Ltd Xiongan New AreaHebei 071700China National Synchrotron Radiation Laboratory(NSRL) University of Science and Technology of ChinaHefei 230029China

The electrochemical CO_(2) reduction reaction(CO_(2)RR)holds significant promise in advancing carbon *** catalysts for the electrochemical CO_(2)RR to multi-carbon(C_(2+))products(e.g.,C_(2)H_(4))under industrial-level current density is urgently needed and ***,we report the Cu_(2)O nanoparticles doped with interstitial carbon atoms(denoted as C-Cu_(2)O NPs)for the conversion of CO_(2) to C_(2+)*** interstitial carbon promotes the C-Cu_(2)O NPs to possess abundant unsaturated Cu–O bonds,leading to a high-density Cu^(δ+)(0<δ<1)*** obtained C-Cu_(2)O NPs exhibited significant Faradic efficiency(FE)of C_(2+) products approaching 76.9%and a partial current density reaching 615.2 mA·cm^(–2)under an industrial-level current density of 800 mA·cm^(–2).Furthermore,the efficient electrosynthesis of C_(2)H_(4) achieved an FE of 57.4%with a partial current density of 459.2 mA·cm^(–2).In situ electrochemical attenuated total reflection Fourier transform infrared spectroscopy and in situ Raman spectroscopy analyses revealed that C-Cu_(2)O NPs stabilized the intermediate*CO and facilitated C–C coupling,leading to increased selectivity towards C_(2+) products.

关键词： CO_(2) electroreduction C-C coupling interstitial carbon CO coverage industrial-level current density

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