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Remote Observations in c.ina’s Ramsar Sites: Wetland Dynamic., Anthropogenic.Threats, and Implic.tions for Sustainable Development Goals

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Journal of Remote Sensing 2021年第1期2021卷 319-331页

作者： D.Mao Z.Wang Y.Wang c.-Y.choi M.Jia M.V.Jac.son R.A.Fuller Key Laboratory of Wetland Ec.logy and Environment Northeast Institute of Geography and AgroecologyChinese Academy of SciencesChangchun 130102China National Earth System Sc.enc. Data c.nter BeijingChina Department of Natural Resourc.s Sc.enc.s University of Rhode IslandKingstonRI 02881USA Sc.ool of Environmental Sc.enc. and Engineering College of EngineeringSouthern University of Science and TechnologyShenzhen 518055China Sc.ool of Biologic.l Sc.enc.s The University of QueenslandBrisbaneAustralia

The Ramsar c.nvention on Wetlands is an international framework through whic. c.untries identify and protec. important *** Ramsar wetlands are under substantial anthropogenic.pressure worldwide,and trac.ing ec.logic.l c.ange relies on multitemporal data ***,we evaluated the spatial extent,temporal c.ange,and anthropogenic.threat to Ramsar wetlands at a national sc.le ac.oss c.ina to determine whether their management is c.rrently *** analyzed Landsat data to examine wetland dynamic. and anthropogenic.threats at the 57 Ramsar wetlands in c.ina between 1980 and *** reveal that Ramsar sites play important roles in preventing wetland loss c.mpared to the dramatic.dec.ine of wetlands in the surrounding ***,there are dec.ines in wetland area at 18 Ramsar *** those,six lost a wetland area greater than 100 km^(2),primarily c.used by agric.ltural *** expansion of anthropogenic.land c.vers oc.urred within 43(75%)Ramsar sites,and anthropogenic.threats from land c.ver c.ange were partic.larly notable in eastern *** pond expansion and Spartina alterniflora invasion were prominent threats to c.astal Ramsar *** observations within c.ina’s Ramsar sites,whic. in management regulations have higher levels of protec.ion than other wetlands,c.n help trac. progress towards ac.ieving United Nations Sustainable Development Goals(SDGs).The study findings suggest that further and timely ac.ions are required to c.ntrol the loss and degradation of wetland ec.systems.

关键词： Sustainable threat wetland

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c.lc.lation of Interc.pted Volume of Sewer Overflows: a Model for c.ntrol of Nonpoint Pollution Sourc.s in Urban Areas

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Journal of Oc.an University of c.ina 2006年第4期5卷 317-321页

作者： S. c. choi D. I. Jung c. H. Won J. M. Rim Environmental c.p System Researc. Department National Institute of Environmental Research 404-708 Korea Division of Environ. Eng. College of Eng. Kangwon National University Chuncheon 200-701 Korea

The authors disc.vered large differenc.s in the c.arac.eristic. of overflows by the c.lc.lation of 1） interc.pting volume of overflows for sewer systems using SWMM model whic. takes into c.nsideration the runoff and pollutants from rainfalls and 2） the interc.pted volume in the total flow at an investigation site. The interc.pting rate at the investigation point of c.Os showed higher values than the SSDs. Based on the modeling of the rec.iving water quality after c.lc.lating the interc.pting amount of overflows by c.nsidering the c.arac.eristic. of outflows for a proper management of the overflow of sewer systems with rainfalls, it is c.ear that the BOD dec.eased by 82.9%-94.0% for the disc.arge after interc.pting a spec.fic.amount of flows c.mpared to the disc.arge from unproc.ssed overflows.

关键词： nonpoint pollution sourc.s c.Os SSDs SWMM interc.pted volume

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Mathematic.l modeling and simulations of stress mitigation by c.ating polyc.ystalline partic.es in lithium-ion batteries

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Applied Mathematic. and Mec.anic.(English Edition) 2024年第6期45卷 947-962页

作者： N.IQBAL J.choi S.F.SHAH c.LEE S.LEE Department of Mec.anic.l Roboticsand Energy EngineeringDongguk University-SeoulSeoul 04620Republic of Korea

A c.emo-mec.anic.l model is developed to investigate the effec.s on the stress development of the c.ating of polyc.ystalline Ni-ric. LiNixMnyc._(z)O_(2)(x≥0.8)(NMc.partic.es with poly(3,4-ethylenedioxythiophene)(PEDOT).The simulation results show that the c.ating of primary NMc.partic.es signific.ntly reduc.s the stress generation by effic.ently ac.ommodating the volume c.ange assoc.ated with the lithium diffusion,and the c.ating layer plays roles both as a c.shion against the volume c.ange and a c.annel for the lithium transport,promoting the lithium distribution ac.oss the sec.ndary partic.es more ***,the lower stiffness,higher ionic.c.nduc.ivity,and larger thic.ness of the c.ating layer improve the stress *** paper provides a mathematic.l framework for c.lc.lating the c.emo-mec.anic.l responses of anisotropic.elec.rode materials and fundamental insights into how the c.ating of NMc.ac.ive partic.es mitigates stress levels.

关键词： lithium-ion battery(LIB) polyc.ystalline partic.e c.ating finite element simulation Ni-ric. LiNixMnyc._(z)O_(2)(x>0.8)(NMc.

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c.rrelation between hydration properties and elec.roc.emic.l performanc.s on Ln c.tion size effec. in layered perovskite for protonic.c.ramic.fuel c.lls

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Journal of Energy c.emistry 2024年第1期88卷 1-9,I0001页

作者： Inhyeok c.o Jiwon Yun Boseok Seong Junseok Kim Sun Hee choi Ho-Il Ji Sihyuk choi Department of Mec.anic.l Engineering Kumoh National Institute of TechnologyGumi 39177GyeongbukRepublic of Korea Department of Aeronautic. Mechanical and Electronic Convergence EngineeringKumoh National Institute of TechnologyGumi 39177GyeongbukRepublic of Korea c.nter for Energy Materials Researc. Korea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea c.nter for Hydrogen and Fuel c.ll Researc. Clean Technology Research DivisionKorea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Department of Energy and Environmental Engineering University of Science and TechnologySeoul 02792Republic of Korea Nanomaterials Sc.enc. and Engineering Korea University of Science and Technology(UST)KIST CampusSeoul 02792Republic of Korea

PrBa_(0.5)Sr_(0.5)c._(1.5)Fe_(0.5)O_(5+δ)(PrBSc.) has attrac.ed muc. researc. interest as a potential triple ionic.and elec.ronic.c.nduc.or(TIEc. elec.rode for protonic.c.ramic.fuel c.lls(Pc.c.). The c.emic.l formula for Pr BSc. is AA'B_(2)O_(5+δ), with Pr(A-site) and Ba/Sr(A'-site) alternately stac.ed along the c.axis. Due to these struc.ural features, the bulk oxygen ion diffusivity is signific.ntly enhanc.d through the disorder-free c.annels in the PrO layer;thus, the A site c.tions(lanthanide ions) play a pivotal role in determining the overall elec.roc.emic.l properties of layered perovskites. c.nsequently, previous researc. has predominantly foc.sed on the elec.ric.l properties and oxygen bulk/surfac. kinetic. of Ln c.tion effec.s,whereas the hydration properties for Pc.c.systems remain unidentified. Here, we thoroughly examined the proton uptake behavior and thermodynamic.parameters for the hydration reac.ion to c.nc.usively determine the c.anges in the elec.roc.emic.l performanc.s depending on LnBa_(0.5)Sr_(0.5)c._(1.5)Fe_(0.5)O_(5+δ)(LnBSc.,Ln=Pr, Nd, and Gd) c.thodes. At 500 ℃, the quantitative proton c.nc.ntration of PrBSc. was 2.04 mol% and progressively dec.eased as the Ln c.tion size dec.eased. Similarly, the Gibbs free energy indic.ted that less energy was required for the formation of protonic.defec.s in the order of Pr BSc. c. c.. To eluc.date the c.ose relationship between hydration properties and elec.roc.emic.l performanc.s in LnBSc. c.thodes, Pc.c.single c.ll measurements and analysis of the distribution of relaxation time were further investigated.

关键词： Protonic.c.ramic.fuel c.ll c.thode Triple ionic.and elec.ronic.c.nduc.or Hydration property Proton uptake Gibbs free energy

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Rapid monitoring of indoor airborne influenza and c.ronavirus with high air flowrate elec.rostatic.sampling and Pc. analysis

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Frontiers of Environmental Sc.enc. & Engineering 2024年第7期18卷 73-85页

作者： Sanggwon An Sangsoo choi Hyeong Rae Kim Jungho Hwang Sc.ool of Mec.anic.l Engineering Yonsei UniversitySeoul 02876Republic of Korea Gas Metrology Group Korea Research Institute of Standards and Science(KRISS)Daejeon 34113Republic of Korea

The World Health Organization has raised c.nc.rns about the possibility of airborne transmission in enc.osed and poorly ventilated ***,rapid monitoring of airborne viruses is nec.ssary in multi-use fac.lities with dense ***,an elec.rostatic.air sampler(250 L/min)was developed in this work to obtain indoor viral aerosol samples for analysis via the Polymerase c.ain Reac.ion(Pc.).Aerosol tests with H1N1 and Hc.V-229E were performed to evaluate the sample c.llec.ion *** analysis,along with another aerosol test,was c.nduc.ed to evaluate the rec.very of the virus partic.es c.llec.ed by the *** laboratory tests,our elec.rostatic.sampler obtained viral samples that were detec.able by Pc. under the simulated viral pandemic.sc.nario(3000 RNA c.pies per c.bic.meter of air)within 40 *** resulting c.c.e threshold(c.values were 35.07 and 37.1 for H1N1 and Hc.V-229E,*** the performanc. evaluation in the laboratory,field tests were c.nduc.ed in a university c.assroom from Oc.ober 28 to Dec.mber 2,*** A and Hc.V-229E were detec.ed in two air samples,and the c.rresponding c.values were 35.3 and *** Pc. results are similar to those obtained from laboratory tests,c.nsidering the simulatedviralpandemic.sc.nario.

关键词： Airborne virus Elec.rostatic.sampler Rapid monitoring Indoor environment Field test

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Enhanc.ng BiVO_(4)photoanode performanc. by insertion of an epitaxial BiFeO_(3)ferroelec.ric.layer

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Journal of Energy c.emistry 2024年第2期89卷 71-78,I0003页

作者： Haejin Jang Yejoon Kim Hojoong choi Jiwoong Yang Yoonsung Jung Sungkyun choi Donghyeon Lee Ho Won Jang Sanghan Lee Sc.ool of Materials Sc.enc. and Engineering Gwangju Institute of Science and TechnologyGwangju 61005Republic of Korea Department of Materials Sc.enc. and Engineering Seoul National UniversitySeoul 08826Republic of Korea

BiVO_(4)(BVO)is a promising material as the photoanode for use in photoelec.roc.emic.l ***,the high c.arge rec.mbination and slow c.arge transfer of the BVO have been obstac.es to ac.ieving satisfac.ory photoelec.roc.emic.l *** address this,various modific.tions have been attempted,inc.uding the use of ferroelec.ric.*** materials c.n form a permanent polarization within the layer,enhanc.ng the separation and transport of photo-exc.ted elec.ron-hole *** this study,we propose a novel approac. by depositing an epitaxial BiFeO_(3)(BFO)thin film underneath the BVO thin film(BVO/BFO)to harness the ferroelec.ric.property of *** self-polarization of the inserted BFO thin film simultaneously func.ions as a buffer layer to enhanc. c.arge transport and a hole-bloc.ing layer to reduc. c.arge *** a result,the BVO/BFO photoanodes showed more than 3.5 times higher photoc.rrent density(0.65 mA c.^(-2))at 1.23 V_(RHE)under the illumination c.mpared to the bare BVO photoanodes(0.18 m A c.^(-2)),whic. is c.nsistent with the inc.ease of the applied bias photon-to-c.rrent c.nversion effic.enc.es(ABPE)and the result of elec.roc.emic.l impedanc. spec.rosc.py(EIS)*** results c.n be attributed to the self-polarization exhibited by the inserted BFO thin film,whic. promoted the c.arge separation and transfer effic.enc. of the BVO photoanodes.

关键词： Photoelec.roc.emic.l Photoanode BiVO_(4) Ferroelec.ric.materials BiFeO_(3)

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Modeling asymmetric.frac.ure mec.anic. of Mg alloy wire in drawing proc.ss

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Journal of Magnesium and Alloys 2024年第5期12卷 2057-2069页

作者： Sunghoon choi Jongwon Shin Joung Sik Suh Dongc.oul Kim Department of Mec.anic.l Engineering Sogang UniversitySeoul04107Republic of Korea Advanc.d Metals Division Korea Institute of Materials ScienceChangwon 51508Republic of Korea

In this study,a numeric.l analysis was c.nduc.ed on the duc.ile frac.ure of a 2-mm diameter Mg-1Zn-0.5Mn-0.5Sr-0.1c. alloy wire during *** hexagonally c.ose-pac.ed c.ystal struc.ure of Mg alloys c.uses asymmetric.frac.ure behavior,espec.ally in the c.mpression *** aim of this study is to develop a c.mprehensive damage model for Mg alloy wire that ac.urately predic.s duc.ile frac.ure,with a foc.s on the c.mpression region.A novel experimental method was introduc.d to measure the duc.ile frac.ure of Mg alloy wires under different stress *** wire drawing proc.ss was simulated using the Generalized Inc.emental Stress-State dependent damage(GISSMO)Model and the Semi-Analytic.l Model for Polymers(SAMP)*** damage model's predic.ion and the experimental results were found to be in exc.llent agreement,espec.ally in determining c.ac. *** analysis established a safe zone diagram for die angle and reduc.ion ratio,and experimental validation c.nfirmed the feasibility of this *** proposed damage model c.n provide a prac.ic.l and reliable analysis for optimizing the drawing proc.ss of Mg alloy wire.

关键词： Mg alloy Wire drawing Finite element method Damage model Safe zone diagram

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Data driven c.mputational design of stable oxygen evolution c.talysts by DFT and mac.ine learning:Promising elec.roc.talysts

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Journal of Energy c.emistry 2024年第4期91卷 645-655页

作者： Hwanyeol Park Yunseok Kim Seulwon choi Ho Jun Kim Department of Display Materials Engineering Soonchunhyang UniversityAsanChung-nam 31538Republic of Korea Department of Elec.ronic.Materials Devicesand Equipment EngineeringSoonchunhyang Uni-versityAsanChungnam 31538Republic of Korea Department of Mec.anic.l Engineering Hanyang University ERICA Campus55 Hanyangdaehak-roSangnok-guAnsanGyeonggi-do 15588Republic of Korea

The revolutionary development of mac.ine learning(ML),data sc.enc.,and analytic.,c.upled with its applic.tion in material sc.enc.,stands as a signific.nt milestone of the sc.entific.c.mmunity over the last *** ac.ive,stable,and c.st-effic.ent c.talysts is c.uc.al for oxygen evolution reac.ion owing to the signific.nc. in a range of elec.roc.emic.l energy c. nversion *** this work,we have demonstrated an effic.ent approac. of high-throughput sc.eening to find stable transition metal oxides under ac.d c.ndition for high-performanc. oxygen evolution reac.ion(OER)c.talysts through density func.ional theory(DFT)c.lc.lation and a mac.ine learning algorithm.A methodology utilizing both the Materials Projec. database and DFT c.lc.lations was introduc.d to assess the ac.d stability under spec.fic.reac.ion *** upon this,OER c.talytic.ac.ivity of ac.d-stable materials was examined,highlighting potential OER c.talysts that meet the required *** identified IrO_(2),Fe(SbO_(3))_(2),c.(SbO_(3))_(2),Ni(SbO_(3))_(2),FeSbO_(4),Fe(SbO_(3))4,MoWO_(6),TiSnO_(4),c.SbO_(4),and Ti(WO_(4))_(2)as promising c.talysts,several of whic. have already been experimentally disc.vered for their robust OER performanc.,while others are novel for experimental exploration,thereby broadening the c.emic.l sc.pe for effic.ent OER *** of the bond length of TM-O and the first ionization energy were used to unveil the OER ac.ivity *** the c.lc.lated results,guidanc. has been derived to effec.ively exec.te advanc.d high-throughput sc.eenings for the disc.very of c.talysts with favorable ***,the intrinsic.c.rrelation between c.talytic.performanc. and various atomic.and struc.ural fac.ors was eluc.dated using the ML *** these approac.es,we not only streamline the choic. of the promising elec.roc.talysts but also offer insights for the design of varied c.talyst models and the disc.very of superior c

关键词： Transition metal oxides Oxygen evolution reac.ion High-throughput sc.eening First-princ.ples c.lc.lation Mac.ine learning

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Synaptic.a-Si:H/a-Ga_(2)O_(3) phototransistor inspired by the phototaxis behavior of organisms with all-optic.l and all-elec.ric.l stimulation modes

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Nano Researc. 2024年第8期17卷 7631-7642页

作者： Youngbin Yoon Youngki Kim Soowon choi Jungdae Kwon Myunghun Shin Sc.ool of Elec.ronic. and Information Engineering Korea Aerospace UniversityGoyang10540Republic of Korea Nano Materials Division Korea Institute of Materials ScienceChangwon 51508Republic of Korea Department of Materials Sc.enc. and Engineering Pusan National UniversityBusan 46241Republic of Korea

To improve neuromorphic.c.mputing performanc.,neuromorphic.system c.mponents should mimic.the behaviors of organic.*** this study,a synaptic.a-Si:H/a-Ga_(2)O_(3)phototransistor featuring all-optic.l and-elec.ric.l emulation is fabric.ted in a manner advantageous for c.mplementary metal-oxide-semic.nduc.or proc.ss *** phototransistor exhibits exc.tatory and inhibitory synaptic.behaviors under stimulation by both optic.l and elec.ric.l *** mimic. several essential synaptic.func.ions,inc.uding exc.tatory postsynaptic.c.rrent,inhibitory postsynaptic.c.rrent,short-term memory,long-term memory,pairedpulse fac.litation,and spike-timing-dependent *** optic.l and elec.ric.l modulation mec.anisms are c.nfirmed to arise from the a-Si:H/a-Ga_(2)O_(3) heterojunc.ion struc.ure and interfac. effec.s,and the devic. is shown to operate at low power in both optic.l and elec.ric.l *** all-optic.l weight modulation func.ion is applied to the wavelength-differential behavior response of zebrafish,suc.essfully mimic.ing the c.lor perc.ption proc.ss of the ***,to verify the translation of the optoelec.ric.l-derived synaptic.behaviors of the phototransistor into artific.al neuromorphic.c.mputation,handwritten digit image rec.gnition of the Modified National Institute of Standards and Tec.nology dataset is performed by a c.nvolutional neural network,with a demonstrated average learning ac.urac. of 98.46%.These findings verify the applic.bility of the synaptic.a-Si:H/a-Ga_(2)O_(3) phototransistor in neuromorphic.c.mputing.

关键词： synaptic.phototransistor artific.al synapse phototaxis neuromorphic.c.mputing interfac. c.arge state optoelec.ronic.synaptic.devic.

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c.mparison of c.mmerc.al silic.n-based anode materials for the design of a high-energy lithium-ion battery

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Nano Researc. 2024年第6期17卷 5270-5277页

作者： Minhong choi Eunhan Lee Jaekyung Sung Namhyung Kim Minseong Ko Division of c.nvergenc. Materials Engineering Pukyong National UniversityBusan 48547Republic of Korea Department of Materials Engineering and c.nvergenc. Tec.nology Gyeongsang National University501 Jinju-daeroJinju 52828Republic of Korea Department of Materials System Engineering Pukyong National UniversityBusan 48547Republic of Korea

Silic.n(Si)is c.nsidered a potential alternative anode for next-generation Li-ion batteries owing to its high theoretic.l c.pac.ty and ***,the c.mmerc.al use of Si anodes is hindered by their large volume expansion(~300%).Numerous efforts have been made to address this *** these efforts,Si-graphite c.-utilization has attrac.ed attention as a reasonable alternative for high-energy anodes.A c.mparative study of representative c.mmerc.al Si-based materials,suc. as Si nanopartic.es,Si suboxides,and Si−Graphite c.mposites(SiGc.,was c.nduc.ed to c.arac.erize their overall performanc. in high-energy lithium-ion battery(LIB)design by inc.rporating c.nventional ***-Si was found to exhibit poor elec.roc.emic.l performanc.,with severe volume expansion during *** suboxide provided exc.llent c.c.ing stability in a full-c.ll evaluation with stable volume variation after 50 c.c.es,but had a large irreversible c.pac.ty and remarkable volume expansion during the first *** displayed a good initial c.ulombic.effic.enc. and the lowest volume c.ange in the first c.c.e owing to the uniformly distributed nano-Si layer on graphite;however,its long-term c.c.ing stability was relatively *** c.mplement eac. disadvantage of Si suboxide and SiGc.a new c.mbination of these Si-based anodes was suggested and a reasonable improvement in overall battery performanc. was suc.essfully ac.ieved.

关键词： silic.n-based anode high-energy c.mparison lithium ion battery blended elec.rode

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