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Evaluation of microstructure and mechanical properties of mg-xCe-0.5Zn alloys by nano-indentation

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Transactions of Nonferrous metals Society of China 2010年第7期20卷 1240-1243页

作者： K.C.park B.H.Kim Y.H.park i.m.park Department of material Science and Engineering Pusan National UniversitySan 30 Jangjeon-dongGeumjeong-guBusan 609-735Korea

The microstructure and mechanical properties of mg-xCe-0.5Zn （x=0.5, 1.5, 2.5, molar fraction, %） alloys were examined using a nano-indentation technique. The alloys were fabricated using a vacuum induction melting method under an argon atmosphere The microstruetures of mg-xCe-0.5Zn alloys mainly consist ofa-mg and eutectic mg12Ce phase. The volume fraction and size of the eutectic mgl2Ce phase increase with increasing Ce contents. Nano-indentation test results show that the indentation hardness and elastic modulus of the eutectic mg12Ce phase are higher than those of the a-mg matrix. in addition, the mean indentation hardness and elastic modulus of the mg-xCe-0.5Zn alloys increase with the Ce addition amount increasing.

关键词： mg alloys mg-Ce-Zn rare earth microstructure mechanical properties nano-indentation

Electrochemically Deposited CZTSSe Thin Films for monolithic Perovskite Tandem Solar Cells with Efficiencies Over 17%

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Energy & Environmental materials 2024年第1期7卷 147-152页

作者： Sun Kyung Hwang ik Jae park Se Won Seo Jae Hyun park So Jeong park Jin Young Kim Department of materials Science and Engineering Seoul National UniversitySeoul 08826Korea Department of Applied Physics Sookmyung Women's UniversitySeoul 04310Korea Research institute of Advanced materials and Systems Sookmyung Women's UniversitySeoul 04310Korea Research institute of Advanced materials(RiAm) Seoul National UniversitySeoul 08826Korea

in spite of the high potential economic feasibility of the tandem solar cells consisting of the halide perovskite and the kesterite Cu2ZnSn(S,Se)4(CZTSSe),they have rarely been demonstrated due to the difficulty in implementing solution-processed perovskite top cell on the rough surface of the bottom ***,we firstly demonstrate an efficient monolithic two-terminal perovskite/CZTSSe tandem solar cell by significantly reducing the surface roughness of the electrochemically deposited CZTSSe bottom *** surface roughness(R_(rms))of the CZTSSe thin film could be reduced from 424 to 86 nm by using the potentiostatic mode rather than using the conventional galvanostatic mode,which can be further reduced to 22 nm after the subsequent ion-milling *** perovskite top cell with a bandgap of 1.65 eV could be prepared using a solution process on the flattened CZTSSe bottom cell,resulting in the efficient perovskite/CZTSSe tandem solar *** the current matching between two subcells involving the thickness control of the perovskite layer,the best performing tandem device exhibited a high conversion efficiency of 17.5%without the hysteresis effect.

关键词： CZTSSe monolithic tandem solar cells perovskite solution process surface roughness control

Environmentally adaptive reshaping of plant photomorphogenesis by karrikin and strigolactone signaling

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Journal of integrative Plant Biology 2024年第5期66卷 865-882页

作者： Young-Joon park Bo Eun Nam Chung-mo park Department of Smart Farm Science Kyung Hee UniversityYongin 17104Korea Departmentof Biological Sciences Seoul National UniversitySeoul 08826Korea Department of Chemistry Seoul National UniversitySeoul 08826Korea

Coordinated morphogenic adaptation of growing plants is critical for their survival and propagation under fluctuating *** morphogenic responses to light and warm temperatures,termed photomorphogenesis and thermomorphogenesis,respectively,have been extensively studied in recent *** photomorphogenesis,plants actively reshape their growth and developmental patterns to cope with changes in light ***,photomorphogenesis is closely associated with diverse growth hormonal ***,accumulating evidence indicates that light-directed morphogenesis is profoundly affected by two recently identified phytochemicals,karrikins(KARs)and strigolactones(SLs).KARs and SLs are structurally related butenolides acting as signaling molecules during a variety of developmental steps,including seed *** receptors and signaling mediators have been identified,and associated working mechanisms have been explored using gene-deficient mutants in various plant *** particular interest is that the KAR and SL signaling pathways play important roles in environmental responses,among which their linkages with photomorphogenesis are most comprehensively studied during seedling *** this review,we focus on how the phytochemical and light signals converge on the optimization of morphogenic *** also discuss molecular mechanisms underlying the signaling crosstalks with an aim of developing potential ways to improve crop productivity under climate changes.

关键词： karrikins morphogenic adaptation photomorphogenesis seedling establishment strigolactones

iso-propagation vortices:a breakthrough in optical communication technology

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Advanced Photonics 2024年第3期6卷 13-15页

作者： Cherry park Junsuk Rho Pohang University of Science and Technology(POSTECH) Department of Mechanical EngineeringPohangRepublic of Korea Pohang University of Science and Technology(POSTECH) Department of Chemical EngineeringPohangRepublic of Korea Pohang University of Science and Technology(POSTECH) Department of Electrical EngineeringPohangRepublic of Korea POSCO-POSTECH-RiST Convergence Research Center for Flat Optics and metaphotonics PohangRepublic of Korea

The rapid advance of optical communication technology requires improvements in data transmission capacity and *** methods of increasing the transmission capacity such as polarization,wavelength,and spatial mode division multiplexing have shown significant promise,while spatial mode division multiplexing(SDm)offers a new approach through the use of orthogonal spatial modes as distinct communication channels.

关键词： communication optical polarization

m1-polarized macrophage-derived cellular nanovesicle-coated lipid nanoparticles for enhanced cancer treatment through hybridization of gene therapy and cancer immunotherapy

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Acta Pharmaceutica Sinica B 2024年第7期14卷 3169-3183页

作者： Ha Eun Shin Jun-Hyeok Han Seungyong Shin Ga-Hyun Bae Boram Son Tae-Hyung Kim Hee Ho park Chun Gwon park Wooram park Department of integrative Biotechnology Sungkyunkwan University(SKKU)SuwonGyeonggi 16419Republic of Korea Deparment of inteligent Precision Healthcare Convergence SKKUSuwonGyeonggi 16419Republic of Korea Department of metaBioHealth SKKU Institute for ConvergenceSKKUSuwonGyeonggi 16419Republic of Korea Department of Bioengineering Hanyang UniversitySeoul 04763Republic of Korea Department of integrative Engineering Chung-Ang UniversitySeoul 06974Republic of Korea Department of Biomedical Engineering SKKUSuwonGyeonggi 16419Republic of Korea Korea institute of Science and Technology(KiST) Seoul 02792Republic of Korea

Optimum genetic delivery for modulating target genes to diseased tissue is a major obstacle for profitable gene *** nanoparticles(LNPs),considered a prospective vehicle for nucleic acid delivery,have demonstrated efficacy in human use during the COViD-19 *** study introduces a novel biomaterial-based platform,m1-polarized macrophage-derived cellular nanovesicle-coated LNPs(m1-C-LNPs),specifically engineered for a combined gene-immunotherapy approach against solid *** dual-function system of m1-C-LNPs encapsulates Bcl2-targeting siRNA within LNPs and immune-modulating cytokines within m1 macrophage-derived cellular nanovesicles(m1-NVs),effectively facilitating apoptosis in cancer cells without impacting T and NK cells,which activate the intratumoral immune response to promote granule-mediating killing for solid tumor *** retention within tumor was observed upon intratumoral administration of m1-C-LNPs,owing to the presence of adhesion molecules on m1-NVs,thereby contributing to superior tumor growth *** findings represent a promising strategy for the development of targeted and effective nanoparticle-based cancer genetic-immunotherapy,with significant implications for advancing biomaterial use in cancer therapeutics.

关键词： Genetic-immunotherapy m1 macrophage-derived cellular nanovesicles Lipid nanoparticles(LNPs) Gene therapy siRNA Cancer immunotherapy Solid tumor Tumor microenvironment(TmE)

One dimensional pea-shaped NiSe_(2) nanoparticles encapsulated in N-doped graphitic carbon fibers to boost redox reversibility in sodium-ion batteries

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Journal of materials Science & Technology 2024年第1期168卷 215-226页

作者： Hyunjeong Gim Achmad Yanuar maulana Jiwon Choi Jungwook Song Boram Yun Yuri Jeong Nahyun An myeongkee park Cybelle m.Futalan Jongsik Kim Department of Chemical Engineering(BK21 FOUR Graduate Program) Dong-A UniversityBusan 49315Korea(the Republic of) Department of Chemistry Dong-A UniversityBusan 49315Korea(the Republic of) Department of Chemistry Pukyong National UniversityBusan 48513Korea(the Republic of) institute of Civil Engineering University of the PhilippinesDiliman 1127Philippines

in recent years,sodium-ion batteries(SiBs)have emerged as a promising technology for energy storage systems(ESSs)because of the abundance and affordability of ***,metal selenides have been studied as promising high-performance conversion-type anode materials in *** them,nickel se-lenide(NiSe_(2))has received considerable attention due to its high theoretical capacity of 495 mAh g^(-1)and ***,it still suffers from poor cycling stability because of the low electrochemical reactivity,large volume expansion,and structural instability during *** address these challenges,NiSe_(2)nanoparticles encapsulated in N-doped graphitic carbon fibers(NiSe_(2)@NGCF)were synthesized by using ZiF-8 as a ***_(2)@NGCF showed a high discharge capacity of 558.3 mAh g^(-1)with a fading rate of 0.14%per cycle after 200 cycles at 0.5 A g^(-1)in 0.01-3.0 *** a very high current density of 5 A g^(-1),the capacity still displayed excellent long-term cycle life with a discharge capacity of 406.1 mAh g^(-1)with a fading rate of 0.016%per cycle after 3000 *** mechanism of the excellent electrochem-ical performance of NiSe_(2)@NGCF was thoroughly investigated by ex-situ XRD,TEm,and SEm ***,NiSe_(2)@NGCF//Na_(3)V_(2)(PO_(4))_(3)full-cell also delivered an excellent reversible capacity of 378.7 mAh g^(−1)at 0.1 A g^(−1)after 50 cycles,demonstrating its potential for practical application in SiBs.

关键词： Sodium-ion batteries Anode materials Nickel selenide N-doped graphitic carbon fibers One-dimensional electrode

Artificial intelligence:A new era for spatial modelling and interpreting climate-induced hazard assessment

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Geoscience Frontiers 2024年第4期15卷 1-13页

作者： Abhirup Dikshit Biswajeet Pradhan Sahar S.matin Ghassan Beydoun m.Santosh Hyuck-Jin park Khairul Nizam Abdul maulud Centre for Advanced modelling and Geospatial information Systems(CAmGiS) School of Civil&Environmental EngineeringFaculty of Engineering and ITUniversity of Technology SydneyNSW 2007Australia Earth Observation Center Institute of Climate ChangeUniversiti Kebangsaan Malaysia43600 UKM BangiSelangorMalaysia Department of Energy and mineral Resources Engineering Sejong UniversityChoongmu-gwan209 Neungdong-roGwangjin-guSeoul 05006Republic of Korea School of Earth Sciences and Resources China University of Geosciences BeijingXueyuan RoadBeijing 100083China Department of Earth Sciences University of AdelaideAdelaideSouth AustraliaAustralia Faculty of Science Kochi UniversityKochi 780-8520Japan

The application of Artificial intelligence in various fields has witnessed tremendous progress in the recent *** field of geosciences and natural hazard modelling has also benefitted immensely from the introduction of novel algorithms,the availability of large quantities of data,and the increase in computational *** enhancement in algorithms can be largely attributed to the elevated complexity of the network architecture and the heightened level of abstraction found in the network's later *** a result,Ai models lack transparency and accountability,often being dubbed as"black box"*** Ai(XAi)is emerging as a solution to make Ai models more transparent,especially in domains where transparency is *** discussion surrounds the use of XAi for diverse purposes,as researchers explore its applications across various *** the growing body of research papers on XAi case studies,it has become increasingly important to address existing gaps in the *** current literature lacks a comprehensive understanding of the capabilities,limitations,and practical implications of *** study provides a comprehensive overview of what constitutes XAi,how it is being used and potential applications in hydrometeorological natural *** aims to serve as a useful reference for researchers,practitioners,and stakeholders who are currently using or intending to adopt XAi,thereby contributing to the advancements for wider acceptance of XAi in the future.

关键词： Artificial intelligence Explainable Ai(XAi) Climate change Spatial modelling Natural hazards

Electrically tunable third-harmonic generation using intersubband polaritonic metasurfaces

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Light(Science & Applications) 2024年第8期13卷 1666-1674页

作者： Seongjin park Jaeyeon Yu Gerhard Boehm mikhail A.Belkin Jongwon Lee Department of Electrical Engineering Ulsan National Institute of Science and Technology(UNIST)UlsanRepublic of Korea Walter Schottky institute Technical University of MunichGarchingGermany

Nonlinear intersubband polaritonic metasurfaces,which integrate giant nonlinear responses derived from intersubband transitions of multiple quantum wells(mQWs)with plasmonic nanoresonators,not only facilitate efficient frequency conversion at pump intensities on the order of few tens of kW cm^(-2)but also enable electrical modulation of nonlinear responses at the individual meta-atom level and dynamic beam *** electrical modulation characteristics of the magnitude and phase of the nonlinear optical response are realized through Stark tuning of the resonant intersubband *** this study,we report,for the first time,experimental implementations of electrical modulation characteristics of mid-infrared third-harmonic generation(THG)using an intersubband polaritonic metasurface based on mQW with electrically tunable third-order nonlinear ***,we achieved a 450%modulation depth of the THG signal,86%suppression of zero-order THG diffraction tuning based on local phase tuning exceeding 180 degrees,and THG beam steering using phase *** work proposes a new route for electrically tunable flat nonlinear optical elements with versatile functionalities.

关键词： tunable tuning pump

Azimuthal rotation-controlled nanoinscribing for continuous patterning of period-and shapetunable asymmetric nanogratings

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microsystems & Nanoengineering 2024年第3期10卷 207-218页

作者： Useung Lee Hyein Kim Dong Kyo Oh Nayeong Lee Jonggab park Jaewon park Hyunji Son Hyunchan Noh Junsuk Rho Jong G.Ok Department of mechanical and Automotive Engineering Seoul National University of Science and TechnologySeoul 01811Republic of Korea Department of mechanical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea POSCO-POSTECH-RiST Convergence Research Center for Flat Optics and metaphotonics Pohang 37673Republic of Korea National institute of Nanomaterials Technology(NiNT) Pohang 37673Republic of Korea Present address:Department of mechanical Engineering Korea University145 Anam-roSeongbuk-guSeoul 02841Republic of Korea Research Team Hyundai Motor Group150 Hyundaiyeonguso-roHwaseong-siGyeonggi 18280Republic of Korea

We present an azimuthal-rotation-controlled dynamic nanoinscribing(ARC-DNi)process for continuous and scalable fabrication of asymmetric nanograting structures with tunable periods and shape profiles.A sliced edge of a nanograting mold,which typically has a rectangular grating profile,slides over a polymeric substrate to induce its burrfree plastic deformation into a linear *** this continuous nanoinscribing process,the“azimuthal angle,”that is,the angle between the moving direction of the polymeric substrate and the mold’s grating line orientation,can be controlled to tailor the period,geometrical shape,and profile of the inscribed *** modulating the azimuthal angle,along with other important ARC-DNi parameters such as temperature,force,and inscribing speed,we demonstrate that the mold-opening profile and temperature-and time-dependent viscoelastic polymer reflow can be controlled to fabricate asymmetric,blazed,and slanted nanogratings that have diverse geometrical profiles such as trapezoidal,triangular,and ***,period-and profile-tunable ARC-DNi can be utilized for the practical fabrication of diverse optical devices,as is exemplified by asymmetric diffractive optical elements in this study.

关键词： tunable asymmetric rotation