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Journal of Materials Science & Technology 2022年第3期98卷 248-257页

作者： Dong Hwi Kim jee-hyun kang Hojun Gwon Joo hyun Ryu Sung-Joon Kim Graduate Institute for Ferrous Technology Pohang University of Science and TechnologyPohang 37673Republic of Korea School of Materials Science and Engineering Institute of Materials TechnologyYeungnam UniversityGyeongsan 38541Republic of Korea POSCO Technical Research Laboratories POSCOGwangyang 57807Republic of Korea

Silicon is an essential alloying element in quenching and partitioning(Q&P)steels,because it is known to suppress carbide precipitation during partitioning step and promote carbon partitioning to stabilize *** 2 wt%Si was added to 10Mn-2Al-0.2C steel,the size and fraction of the carbides formed during partitioning became smaller than in the Si-free ***,the suppression of carbide formation promoted C partitioning into austenite as ***,austenite stability was always lower with Si under the equivalent partitioning condition because Si effectively decreased the stacking fault energy of *** partitioning progressed,the both yield and tensile strengths of the Si-added steel exceeded that of the Si-free steel with the similar ductility *** was because Si was an effective solid solution strengthener,and the austenite in the Si-added steel exhibited the appropriate stability to gradually transform into martensite throughout the *** resulting strengthening effect compensated for the softening caused by martensite ***,strain hardening rate decreased continuously throughout deformation,which resulted in high tensile strength and ductility.

关键词： Steels Q&P steel Silicon Austenite stability Tensile deformation Stacking fault energy Medium Mn steel

Well-defined high entropy-metal nanoparticles:Detection of the multi-element particles by deep learning

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Journal of Energy Chemistry 2024年第11期98卷 262-273页

作者： Manar Alnaasan Wail Al Zoubi Salh Alhammadi jee-hyun kang Sungho Kim Young Gun Ko Department of Electronics Engineering Yeungnam Univeristy280 Daeha-roGyeongsan38541Republic of Korea Materials Electrochemistry Laboratory School of Materials Science and EngineeringYeungnam UniversityGyeongsan 38541Republic of Korea Department of Future Energy Convergence Seoul National University of Science and Technology232 Gongneung-RoNowon-GuSeoul 01811Republic of Korea School of Materials Science and Engineering Institute of Materials TechnologyYeungnam UniversityGyeongsan 38541Republic of Korea

Characterizing and control the chemical compositions of multi-element particles as single metal nanoparticles(mNPs) on the surfaces of catalytic metal oxide supports is *** can be attributed to the heterogeneity and large size at the nanoscale,the poorly defined catalyst nanostructure,and thermodynamic immiscibility of the strongly repelling metallic *** address these challenges,an ultrasonic-assisted coincident electro-oxidation-reduction-precipitation(U-SEO-P) is presented to fabricate ultra-stable PtRuAgCoCuP NPs,which produces numerous active intermediates and induces strong metal-support *** sort the active high-entropy mNPs,individual NPs are described on the support surface and the role of deep learning in understanding/predicting the features of PtRuAgCoCu@TiO_(x) catalysts is ***,this deep learning approach required minimal to no human *** as-prepared PtRuAgCoCu@TiO_(x) catalysts can be used to catalyze various important chemical reactions,such as a high reduction conversion(100% in 30 s),with no loss of catalytic activity even after 20 cycles of nitroarene and ketone/aldehyde,which is several times higher than commercial Pt@TiO_(x) owing to individual PtRuAgCoCuP NPs on TiO_(x) *** this study,we present the "Totally Defined Catalysis" concept,which has enormous potential for the advancement of high-activity catalysts in the reduction of organic compounds.

关键词： Metal nanoparticles Deep learning Catalyst Reduction

Experimental and theoretical investigation of high-entropy-alloy/support as a catalyst for reduction reactions

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Journal of Energy Chemistry 2023年第6期81卷 132-142,I0005页

作者： Wail Al Zoubi Bassem Assfour Abdul Wahab Allaf Stefano Leoni jee-hyun kang Young Gun Ko Materials Electrochemistry Laboratory School of Materials Science and EngineeringYeungnam UniversityGyeongsan 38541Republic of Korea Atomic Energy Commission Department of ChemistryP.O.Box 6091DamascusSyria Arab International University Department of Pharmaceutical Chemistry and Quality ControlFaculty of PharmacyGhabaghibDarraSyria Cardiff University School of ChemistryPark PlaceCF103AT CardiffUnited Kingdom School of Materials Science and Engineering Institute of Materials TechnologyYeungnam UniversityGyeongsan 38541Republic of Korea

Control of chemical composition and incorporation of multiple metallic elements into a single metal nanoparticle(NP)in an alloyed or a phase-segregated state hold potential scientific merit;however,developing libraries of such structures using effective strategies is challenging owing to the thermodynamic immiscibility of repelling constituent metallic ***,we present a one-pot interfacial plasma-discharge-driven(IP-D)synthesis strategy for fabricating stable high-entropy-alloy(HEA)NPs exhibiting ultrasmall size on a porous support ***,an electric field was applied for 120 s to enhance the incorporation of multiple metallic elements(i.e.,CuAgFe,CuAgNi,and CuAgNiFe)into ally ***,NPs were attached to a porous magnesium oxide surface via rapid *** solar light as the sole energy input,the CuAgNiFe catalyst was investigated as a reusable and sustainable material exhibiting excellent catalytic performance(100%conversion and 99% selectivity within1 min for a hydrogenation reaction)and consistent activity even after 20 cycles for a reduction reaction,considerably outperforming the majority of the conventional ***,the proposed strategy establishes a novel method for designing and synthesizing highly efficient and stable catalysts for the convertion of nitroarenes to anilines via chemical reduction.

关键词： Plasma Miscible Multicomponent Metal nanoparticle Nanocatalysts

Origin of the synergistic effects of bimetallic nanoparticles coupled with a metal oxide heterostructure for accelerating catalytic performance

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SusMat 2024年第3期4卷 227-239页

作者： Wail Al Zoubi Abdullah Al Mahmud Farah Hazmatulhaq Mohammad R.Thalji Stefano Leoni jee-hyun kang Young Gun Ko Integrated Materials Chemistry Laboratory School of Materials Science and EngineeringYeungnam UniversityGyeongsanRepublic of Korea School of Chemical Engineering Yeungnam University280 Daehak-roGyeongsanGyeongbukRepublic of Korea Korea Institute of Energy Technology(KENTECH) 200 Hyeokshin-roJeollanam-doNajuRepublic of Korea Cardiff University School of ChemistryCF103AT CardiffUnited Kingdom

Precisely tuning bicomponent intimacy during reactions by traditional methods remains a formidable challenge in the fabrication of highly active and stable catalysts because of the difficulty in constructing well-defined catalytic systems and the occurrence of agglomeration during *** overcome these limitations,a PtRuPNiO@TiO_(x)catalyst on a Ti plate was prepared by ultrasound-assisted low-voltage plasma *** method involves the oxidation of pure Ti metal and co-reduction of strong metals at 3000◦C,followed by sonochemical ultrasonication under ambient conditions in an aqueous *** intimacy of the bimetals in PtRuPNiO@TiOx is tuned,and the metal nanoparticles are uniformly distributed on the porous titania coating via strong metal-support interactions by leveraging the instantaneous high-energy input from the plasma discharge and ultrasonic *** intimacy of PtRuPNiO@TiO_(x)increases the electron density on the Pt ***,the paired sites exhibit a high hydrogen evolution reaction activity(an overpotential of 220 mV at a current density of 10 mA cm^(−2)and Tafel slope of 186 mV dec^(−1)),excellent activity in the hydrogenation of 4-nitrophenol with a robust stability for up to 20 cycles,and the ability to contrast stated catalysts without ultrasonication and plasma *** study facilitates industrially important reactions through synergistic chemical interactions.

关键词： bimetals nanoparticles oxides heterostructures hydrogenation

Extended protective effects of three dimensional cultured human mesenchymal stromal cells in a neuroinflammation model

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World Journal of Stem Cells 2025年第1期17卷 53-65页

作者： Ok-Hyeon Kim Hana kang Eun Seo Chang Younghyun Lim Young-Jin Seo hyun Jung Lee Department of Anatomy and Cell Biology College of MedicineChung-Ang UniversitySeoul 06974South Korea Department of Global Innovative Drugs Graduate School of Chung-Ang UniversitySeoul 06974South Korea Department of Life Science Chung-Ang UniversitySeoul 06974South Korea

BACKGROUND Human mesenchymal stromal cells(MSCs)possess regenerative potential due to pluripotency and paracrine ***,their stemness and immunomod-ulatory capabilities are sub-optimal in conventional two-dimensional(2D)*** To enhance the efficiency and therapeutic efficacy of MSCs,an in vivo-like 3D culture condition was *** MSCs were cultured on polystyrene(2D)or in a gellan gum-based 3D *** vitro,prostaglandin-endoperoxide synthase 2,indoleamine-2,3-dioxygenase,heme oxygenase 1,and prostaglandin E synthase gene expression was quantified by quantitative real-time polymerase chain *** were incubated with lipopolysaccharide(LPS)-treated mouse splenocytes,and prostaglandin E2 and tumor necrosis factor-alpha levels were measured by enzyme linked immuno-sorbent *** vivo,LPS was injected into the lateral ventricle of mouse brain,and MSCs were administered intravenously the next *** were sacrificed and analyzed on days 2 and *** Gellan gum polymer-based 3D culture significantly increased expression of octamer-binding transcription factor 4 and Nanog homeobox stemness markers in human MSCs compared to 2D *** 3D environment also heightened expression of cyclooxygenase-2 and heme-oxygenase 1,enzymes known for immunomodulatory functions,including production of prostaglandins and heme degradation,*** in 3D culture secreted more prostaglandin E2 and effectively suppressed tumor necrosis factor-alpha release from LPS-stimulated splenocytes and surpassed the efficiency of MSCs cultured in *** a murine neuroinflammation model,intravenous injection of 3D-cultured MSCs significantly reduced ionized calcium-binding adaptor molecule 1 and glial fibrillary acidic protein expression,mitigating chronic inflammation more effectively than 2D-cultured *** The microenvironment established in 3D culture serves as an in vivo mimetic,enhancing the immunomodulatory function of *** sugge

关键词： Mesenchymal stromal cells Three-dimensional culture Immunomodulatory function Neuroinflammation Cell therapy

Conversion of N-doped biochar from carotenoid-extracted Tetraselmis suecica and its application to produce supercapacitors

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Journal of Environmental Sciences 2025年第5期151卷 410-423页

作者： Se Hun Lee kang hyun Lee Sang-hwa Lee Soo Kweon Lee Ok Sung Jeon Young Pyo Jeon Dongpyo Hong Young Joon Yoo Sang Yoon Park Hah Young Yoo Advanced Institute of Convergence Technology(AICT) Seoul National UniversitySuwon 16229Republic of Korea Department of Biotechnology Sangmyung University20 Hongjimun 2-GilJongno-GuSeoul 03016Republic of Korea Department of Bio-Convergence Engineering Dongyang Mirae University445-8Gyeongin-roGuro-guSeoul 08221Republic of Korea Fermentation team Lotte R&D Center210 Magokjungang-RoGangseo-GuSeoul 07594Republic of Korea School of Electronic Engineering Kyonggi UniversityGyeonggi-do 16227Republic of Korea

Microalgae are one of the promising feedstocks for biorefinery,contributing significantly to net-zero emissions through carbon capture and ***,the disposal of microalgal byproducts from the manufacturing process causes additional environmental pollution,thus,a new application strategy is *** this study,the Tetraselmis suecica byproduct from the carotenoid extraction process was carbonized and converted into *** converted biochar was proved to be nitrogen-doped biochar(NDB),up to 4.69%,with a specific surface area of 206.59m^(2)/g andwas used as an electrode for a *** NDB electrode(NDB-E)in half-cell showed a maximum specific capacitance of 191 F/*** a full-cell test,the NDB-E exhibited a high energy density of 7.396 Wh/kg and a high-power density of 18,100 W/kg,and maintained specific capacity of 95.5%after charge and discharge of 10,000 *** conclusion,our study demonstrated that the carotenoid-extracted microalgal byproducts are a useful resource for the supercapacitor *** approach is the first to convert *** into active materials for supercapacitors.

关键词： Microalgae Tetraselmis suecica Carbonization N-doped biochar Supercapacitor

Unlocking the power of tandem repeat variations to fine-tune rice phenotypes

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Science Bulletin 2025年第3期70卷 297-298页

作者： kang Chong Key Laboratory of Plant Molecular Physiology Institute of BotanyChinese Academy of SciencesBeijing 100093China University of Chinese Academy of Sciences Beijing 100049China

The diversity of crop phenotypes is shaped by numerous genomic *** staple cereals like rice,lots of functional variants,including quantitative trait locus(QTLs),have been identified and used to improve various crop traits(yield,quality,architecture,etc.).To breed ideal crop cultivars for agricultural production,we need more and more precise modulation of phenotypes to obtain desirable *** the past decade,genome editing techniques have enabled us to precisely change crop genome sequences,and also functional variants[1],[2],[3].

关键词： cultivar cereal precise

Failure rate analysis and maintenance plan optimization method for civil aircraft parts based on data fusion

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Chinese Journal of Aeronautics 2025年第1期38卷 306-324页

作者： kang CAO Yongjie ZHANG Jianfei FENG School of Civil Aviation Northwestern Polytechnical UniversityXi’an 710072China Shanghai Aircraft Design and Research Institute Shanghai 201210China

In the face of data scarcity in the optimization of maintenance strategies for civil aircraft,traditional failure data-driven methods are encountering challenges owing to the increasing reliability of aircraft *** study addresses this issue by presenting a novel combined data fusion algorithm,which serves to enhance the accuracy and reliability of failure rate analysis for a specific aircraft model by integrating historical failure data from similar models as supplementary *** a comprehensive analysis of two different maintenance projects,this study illustrates the application process of the *** upon the analysis results,this paper introduces the innovative equal integral value method as a replacement for the conventional equal interval method in the context of maintenance schedule *** Monte Carlo simulation example validates that the equivalent essential value method surpasses the traditional method by over 20%in terms of inspection efficiency *** discovery indicates that the equal critical value method not only upholds maintenance efficiency but also substantially decreases workload and maintenance *** findings of this study open up novel perspectives for airlines grappling with data scarcity,offer fresh strategies for the optimization of aviation maintenance practices,and chart a new course toward achieving more efficient and cost-effective maintenance schedule optimization through refined data analysis.

关键词： Small sample data Data fusion Failure rate Maintenance planning Aircraft parts

Residential Energy Scheduling With Solar Energy Based on Dyna Adaptive Dynamic Programming

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IEEE/CAA Journal of Automatica Sinica 2025年第2期12卷 403-413页

作者： kang Xiong Qinglai Wei Hongyang Li the Institute of Systems Engineering Macau University of Science and Technology IEEE the State Key Laboratory of Multimodal Artificial Intelligence Systems Institute of Automation Chinese Academy of Sciences the School of Artificial Intelligence University of Chinese Academy of Sciences

Learning-based methods have become mainstream for solving residential energy scheduling problems. In order to improve the learning efficiency of existing methods and increase the utilization of renewable energy, we propose the Dyna actiondependent heuristic dynamic programming(Dyna-ADHDP)method, which incorporates the ideas of learning and planning from the Dyna framework in action-dependent heuristic dynamic programming. This method defines a continuous action space for precise control of an energy storage system and allows online optimization of algorithm performance during the real-time operation of the residential energy model. Meanwhile, the target network is introduced during the training process to make the training smoother and more efficient. We conducted experimental comparisons with the benchmark method using simulated and real data to verify its applicability and performance. The results confirm the method's excellent performance and generalization capabilities, as well as its excellence in increasing renewable energy utilization and extending equipment life.

关键词： Adaptive dynamic programming (ADP) dynamic residential scenarios optimal residential energy management smart grid

Thermal effects on wear behavior of additively manufactured NiTi shape memory alloys

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Chinese Journal of Aeronautics 2025年第1期38卷 147-164页

作者： Xianghui HUANG Nan kang Pei WANG Mohamed EL MANSORI Arts et Metiers Institute of Technology MSMPHESAM UniversitéChâlons-en-Champagne 51006France Henan Key Laboratory of High-Performance Carbon Fiber Reinforced Composites Institute of Carbon Matrix CompositesHenan Academy of SciencesZhengzhou 450046China Texas A&M Engineering Experiment Station Institute for Manufacturing SystemsCollege StationTX 77843USA

NiTi alloys fabricated by laser powder bed fusion(LPBF)additive manufacturing technology not only address the compositional instability resulting from complex processes but also solve the challenges of difficult machining of intricate aerospace ***,there are very few reports on the wear behavior of LPBF-NiTi *** the present work,the effects of microstructure and thermal treatment,including heat treatment and frictional heat,on the wear behavior of LPBF-NiTi alloy and 100Cr6 ball were analyzed through a series of tribological experiments with different sliding *** the average sliding speed increases(0.079–0.216 m/s),the wear rate of the as-built and heat-treated samples tends to decrease in the range of 2.69×10^(-3)–0.97×10^(-3)mm^(3)/*** the heat-treated LPBF-NiTi alloy is 46%harder than the as-built alloy is,the latter has a higher toughness(505 MJ/m^(3))and greater transformation strain of SIM(0.097).This leads to a coupling effect of heat treatment and sliding speed on the wear *** addition,the wear track morphologies under different sliding speeds are asymmetric due to the 24% greater acceleration at the far end from the motor and the 2.15 mm deviation between the maximum speed position and the geometric center of the *** wear modes of the as-built and heat-treated samples included adhesive,abrasive and delamination ***,the wear morphologies and dominant wear modes change with the frictionally caused heat release induced by the sliding speed.

关键词： Additive manufacturing Laser powder bed fusion NiTi alloys Wear resistance Sliding speed