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Prominent cycling reversibility and kinetics enabled by CaTiO3 protective layer on Zn metal for aqueous Zn-ion batteries

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Journal of Energy Ch.mistry 2025年第1期100卷 245-258页

作者： Gaeun Lee Yong Nam Ah. Seongjoon So Ch.nw.o park Jong-Seong Bae Taeh.un park Il Tae Kim Jaeh.un h.r Sch.ol of Ch.mical Biological and Battery Engineering Gachon University Seongnam Busan Center Korea Basic Science Institute

Aqueous Zn-ion batteries （AZIBs） h.ve received considerable attention ow.ng to th.ir various advantages such.as safety,low.cost,simple battery assembly conditions,and h.gh.ionic ***,th.y still suffer from serious problems,including uncontrollable dendrite grow.h.corrosion,h.drogen evolution reaction （h.R） from w.ter decomposition,electrode passivation,and unexpected *** creation of a uniform artificial nanocrystal layer on th. Zn anode surface is a promising strategy for resolving th.se ***,w. propose th. use of a perovskite CaTiO3（CTO） protective layer on Zn（CTO@Zn） as a promising approach.for improving th. performance of *** CTO artificial layer provides an efficient path.0}y for Zn ion diffusion tow.rds th. Zn metal because of th. h.gh.dielectric constant （εr=180） and ferroelectric ch.racteristics th.t enable th. alignment of dipole moments and redistribute th. Zn2+ions in th. CTO *** avoiding th. direct contact of th. Zn anode w.th.th. electrolyte solution,th. uneven dendrite grow.h.corrosion,parasitic side reactions,and h.R are mitigated,w.ile CTO retains its mech.nical and ch.mical robustness during ***,CTO@Zn demonstrates an improved lifespan in a symmetric cell configuration compared w.th.bare ***@Zn sh.w. steady overpotential （～68 m V） for 1500 h.at 1 mA cm-2/0.5 mA h.cm-2,excelling bare ***,w.en paired w.th.th. V2O5-C cath.de,th. CTO@Zn//V2O5-C full battery delivers 148.4 mA h.g-1（based on th. mass of th. cath.de） after 300 *** study provides new.insigh.s into Zn metal anodes and th. development of h.gh.performance AZIBs.

关键词： Perovskite

Scalable Ir‑Doped NiFe_(2)O_(4)/TiO_(2)h.terojunction Anode for Decentralized Saline w.stew.ter Treatment and h.(2)Production

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Nano-Micro Letters 2025年第3期17卷 1-18页

作者： Sukh.0} h.ng Jiseon Kim Jaebeom park Sunmi Im Mich.el R.h.ffmann Kangw.o Ch. Division of Environmental Science and Engineering Pohang University of Science and Technology(POSTECH)Pohang 790−784Korea Linde Laboratory California Institute of TechnologyPasadenaCA 91125USA Institute for Convergence Research.and Education in Advanced Tech.ology(I‑CREATE) Yonsei University International CampusIncheon 21983Republic of Korea

w.stew.ter electrolysis cells(w.Cs)for decentralized w.stew.ter treatment/reuse coupled w.th.h.(2)production can reduce th. carbon footprint associated w.th.transportation of w.ter,w.ste,and energy *** study reports Ir-doped NiFe_(2)O_(4)(NFI,~5 at%Ir)spinel layer w.th.TiO_(2)overlayer(NFI/TiO_(2)),as a scalable h.terojunction anode for direct electrolysis of w.stew.ter w.th.circumneutral ph.in a single-compartment *** dilute(0.1 M)NaCl solutions,th. NFI/TiO_(2)marks superior activity and selectivity for ch.orine evolution reaction,outperforming th. bench.ark IrO_(2).Robust operation in near-neutral ph.w.s *** including operando X-ray absorption spectroscopy unveiled crucial roles of TiO_(2) w.ich.serves both.as th. primary site for Cl−ch.misorption and a protective layer for NFI as an oh.ic *** electrolysis of Nh.+-laden synth.tic w.stew.ter demonstrated th.t NFI/TiO_(2)not only ach.eves quasi-stoich.ometric Nh.(4)^(+)-to-N_(2)conversion,but also enh.nces h.(2)generation efficiency w.th.minimal competing reactions such.as reduction of dissolved oxygen and reactive *** scaled-up w.C w.th.NFI/TiO_(2)w.s demonstrated for electrolysis of toilet w.stew.ter.

关键词： w.stew.ter electrolysis cell Ir-doped NiFe_(2)O_(4) Reactive ch.orine species Decentralized h.(2)production On-site w.stew.ter treatment

Influence of alloying elements on microstructure and microh.rdness of Mg-Sn-Zn-based alloys

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Transactions of Nonferrous Metals Society of Ch.na 2010年第12期20卷 2246-2252页

作者： w. L. Ch.NG S. park w. N. TANG B. S. YOU B. h. KOO Sch.ol of Nano ＆ Advanced Materials Engineering Changwon National University Changwon 641-773 South Korea Ligh. Metals Research.Group Korea Institute of Materials Science （KIMS） Changwon 641-831 South Korea

Th. ph.se evolution in （88%-91%）Mg-8%Sn-l%Zn-X （X=A1, Mn and/or Ce） system w.s analyzed via CALPh.D meth.d and simulations w.re used in precise selection of th. ch.mical composition. Th. influence of th. addition of different alloying elements such.as A1, Mn and Ce on th. microstructure and microh.rdness of Mg-8%Sn-l%Zn-based alloys w.s investigated. Combined addition of A1 and Mn sh.w. features distinct from separate addition of A1 or Mn. Additions of l%AI and l%Mn to base alloy result in th. formation of massive A1-Mn ph.se in a-Mg matrix grains. Addition of Ce element can refme th. second eutectic precipitates and form intermetallic compounds w.th.Sn. Fine rod-like Sn-Ce ph.se presents mainly on th. grain boundaries and plays a role in inh.biting grain grow.h. Th. effects of alloying elements on Vickers microh.rdness and indentation size effect of base alloy w.re examined.

关键词： magnesium alloys alloying elements CALPh.D meth.d h.rdness indentation size effect

Adaptive Functional Projective Lag Synch.onization of a h.perch.otic Rossler System

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Ch.nese Ph.sics Letters 2009年第9期26卷 69-72页

作者： Tae h. Lee Ju h. park Nonlinear Dynamics Group Department of Electrical Engineering Yeungnam University 214-1 Dae-Dong Kyongsan 712-749 Republic of Korea

w. explain th. functional projective lag synch.onization of a h.perch.otic Rossler system w.th.four unknow. parameters, w.ere th. output of th. master system lags beh.nd th. output of th. slave system proportionally. Based on Lyapunov stability th.ory, an active control meth.d and adaptive control law.are employed to make th. states of tw. h.perch.otic Rossler systems asymptotically synch.onized. Finally, some numerical examples are provided to sh.w.th. effectiveness of our results.

关键词： No English.Keyw.rd

h.t Data Identification w.th.Multiple Bloom Filters： Block-Level Decision vs I/O Request-Level Decision

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Journal of Computer Science & Tech.ology 2018年第1期33卷 79-97页

作者： Dongch.l park w.iping h. h. C. Du Division of Computer and Electronic Systems Engineering Hankuk University of Foreign Studies Gyeonggi-do 17035 Korea Intel Corporation Hillsboro OR 97124 U.S.A. Dell Storage Eden Prairie MN 55344 U.S.A. Department of Computer Science and Engineering University of Minnesota-Twin Cities Minneapolis MN 55455 U.S.A.

h.t data identification is crucial for many applications th.ugh.few.investigations h.ve examined th. subject. All existing studies focus almost exclusively on frequency. h.w.ver, effectively identifying h.t data requires equally considering recency and frequency. Moreover, previous studies make h.t data decisions at th. data block level. Such.a fine-grained decision fits particularly w.ll for flash.based storage because its random access ach.eves performance comparable w.th.its sequential access. h.w.ver, h.rd disk drives （h.Ds） h.ve a significant performance disparity betw.en sequential and random access. Th.refore, unlike flash.based storage, exploiting asymmetric h.D access performance requires making a coarse-grained decision. Th.s paper proposes a novel h.t data identification sch.me adopting multiple bloom filters to efficiently ch.racterize recency as w.ll as frequency. Consequently, it not only consumes 50% less memory and up to 58% less computational overh.ad, but also low.rs false identification rates up to 65% compared w.th.a state-of-th.-art sch.me. Moreover, w. apply th. sch.me to a next generation h.D tech.ology, i.e., Sh.ngled Magnetic Recording （SMR）, to verify its effectiveness. For th.s, w. design a new.h.t data identification based SMR drive w.th.a coarse-grained decision. Th. experiments demonstrate th. importance and benefits of accurate h.t data identification, th.reby improving th. proposed SMR drive performance by up to 42%.

关键词： h.t data bloom filter sh.ngled magnetic recording (SMR)

Liquid-liquid extraction and separation of total rare earth.RE) metals from polymetallic manganese nodule leach.ng solution

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Journal of Rare Earth. 2015年第2期33卷 207-213页

作者： P.K.Parh. K.h.park C.w.Nam J.T.park Mineral Resources Research.Division Korea Institute of Geoscience & Mineral Resources (KIGAM)Daejeon 305-350 Republic of Korea Sch.ol of Applied Science and Center of Industrial Tech.ology KIIT UniversityBhubaneswar 751024 Odisha India

Th. study on th. solvent extraction for quantitative and selective separation of total rare earth.metals from th. polymetallic nodule leach.liquor w.s investigated. Th. typical leach.liquor bearing 0. 094 g/L total rare earth. 0. 23 g/L Mn, 0.697 g/L Cu, 0.2 g/L Fe, 0.01 g/L Co and 0.735 g/L Ni w.s subjected to th. removal iron content by precipitation meth.d using Ca（Oh.2 at ph.3.95, prior to solvent extraction of rare earth.metals. Th.ee different organo-ph.sph.ric acid reagents（D2Eh.A, PC88 A, Cyanex 272） w.re used to ascertain th.ir performances and selectivity tow.rds th. loading of rare earth.metals in presence of oth.r base metals. Based on th. results of eq. ph.effect, th. performances of above th.ee extractants follow.d th. order as： D2Eh.A〉PC88A〉Cyanex 272. To ensure th. absence of extraction of base metals（Cu, Co, Ni）, th. eq. ph.of th. solution w.s optimized at th. level of 2.21, th.ugh.h.gh.r rare earth.metal extraction efficiency w.s observed at h.gh.r eq. ph.w.th.eith.r of th. extractants. Th. complete process flow.diagram for substantial recovery of total rare earth.w.s developed using D2 Eh.A. Extraction isoth.rm plot w.s constructed at A：O=12：1, 3-stages and ph.=2.21, using 0.8 mol/L D2 Eh.A and th. predicted condition of th.s study w.s furth.r confirmed by 6-Cycles Counter Current Simulation（CCS） study. Th. stripping of total rare earth.from loaded organic ph.se（LO） w.s conducted using h.l solution. Mc-Cabe Th.ele diagram study carried out at A：O=1：5 using 4 mol/L h.l sh.w.d th.t th.ee th.oretical stages w.re needed for quantitative stripping of total rare earth. Th. subsequent stripped solution resulted th.s led to contain total rare earth.of 5.6 g/L indicating a very h.gh.enrich.ent of total metals by solvent extraction（SX） process.

关键词： total rare earth.(RE) metals SX D2Eh.A h.l deep sea nodule

A Lookah.ad Read Cach.： Improving Read Performance for Deduplication Backup Storage

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Journal of Computer Science & Tech.ology 2017年第1期32卷 26-40页

作者： Dongch.l park Ziqi Fan Young Jin Nam David h. C. Du Department of Computer Science and Engineering University of Minnesota-Twin Cities Minneapolis MN 55455 U.S.A.

Data deduplication （dedupe for sh.rt） is a special data compression tech.ique. It h.s been w.dely adopted to save backup time as w.ll as storage space, particularly in backup storage systems. Th.refore, most dedupe research.h.s primarily focused on improving dedupe w.ite performance. h.w.ver, backup storage dedupe read performance is also a crucial problem for storage recovery. Th.s paper designs a new.dedupe storage read cach. for backup applications th.t improves read performance by exploiting a special ch.racteristic： th. read sequence is th. same as th. w.ite sequence. Consequently, for better cach. utilization, by looking ah.ad for future references w.th.n a moving w.ndow. it evicts victims from th. cach. h.ving th. smallest future access. Moreover~ to furth.r improve read cach. performance. it maintains a small log buffer to judiciously cach. future access data ch.nks. Extensive experiments w.th.real-w.rld backup w.rkloads demonstrate th.t th. proposed read cach. sch.me improves read performance by up to 64.3%

关键词： deduplication dedupe read cach. backup

Ch.mical effects on th. sliding friction of Ag and Au(111)

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Friction 2018年第1期6卷 84-97页

作者： h.E.KO S.G.Kw.N h.w.park A.CARON Korea Tech.Korea University of Tech.ology and Education

w. h.ve investigated th. sliding friction beh.vior of metallic couples w.th.different enth.lpy of mixing or reaction by friction force microscopy. Comparing th. friction beh.vior of miscible and immiscible couples w. find th.t in th. first case friction is governed by adh.sion w.ile th. sh.ar strength.is low.τ = 3–6 MPa). In th. latter case of immiscible couples, adh.sion is found to be low.and th. sh.ar strength.is large(τ≈ 70 MPa). Statistical analysis of atomic stick-slip images recorded on an Au(111) surface w.th.tips of different affinities w.th.gold allow. for a deeper understanding of our results. Th. periodicity of atomic stick-slip images corresponds to th. interatomic distance of gold for immiscible counter-bodies. In contrast, for a reactive couple th. periodicity of atomic stick-slip significantly differs from th. gold interatomic distance and may correspond to th. structural length.of an ordered intermediate ph.se at th. tip-surface interface.

关键词： metals surface friction nanotribology atomic force microscopy

Th. FUNDAMENTAL GROUP OF Th. AUTOMORPh.SM GROUP OF A NONCOMMUTATIVE TORUS Th. FUNDAMENTAL GROUP OF Th. AUTOMORPh.SM GROUP OF A NONCOMMUTATIVE TORUS

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Ch.nese Annals of Math.matics,Series B 2000年第4期21卷 441-452页

作者： D. h. BOO C. G. park Department of Math.matics Chungnam National University TaeJon 305-764 Korea

Assume th.t each.completely irrational noncommutative torus is realized as an inductive limit of circle algebras, and th.t for a completely irrational noncommutative torus Aω of rank m th.re are a completely irrational noncommutative torus Aρ of rank m and a positive integer d such.th.t tr（Aω） = tr（Aρ）. It is proved th.t th. set of all C*-algebras of sections of locally trivial C*-algebra bundles over S2 w.th.fibres Aω. h.s a group structure, denoted by π1（Aut（Aω.））, w.ich.is isomorph.c to Z if d > 1 and w. if d > 1. Let Bcd be a cd-h.mogeneous C*-algebra over S2 x T2 of w.ich.no non-trivial matrix algebra can be factored out. Th. sph.rical noncommutative torns Sρcd is defined by tw.sting C*（T2 x Zm-2） in Bcd C* （Z（m-2）） by a totally skew.multiplier ρ on T2 x Z（m-2）. It is sh.w. th.t Sρcd Mp∞ is isomorph.c to C（S2） C* （T2 x Zm-2, ρ） Mcd（C） Mp∞ if and only if th. set of prime factors of cd is a subset of th. set of prime factors of p.

关键词： C*-algebra bundle h.mogeneous C*-algebra Crossed product Uh.-algebra Cuntz algebra