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h.gh.y Efficient and Stable h.drogen Production in All ph.Range by Two-Dimensional Structured Metal-Doped Tungsten Semicarbides

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Research 2019年第1期2019卷 991-1004页

作者： Edison h.ang Kh.1} n.Dinh.Xiaoli Sun Ying h.ang Jun Yang Zh.li Dong Xiaoch.n Dong Wei h.ang Zh.guo Wang h.a Zh.1} Qingyu Yan Energy Research.Institute Interdisciplinary Graduate SchoolNanyang Technological University637553Singapore Centre for Programmable Materials School of Materials Science and EngineeringNanyang Technological University639798Singapore Institute of Advanced Materials Nanjing Tech UniversityNanjing 210000China Sch.ol of Ph.sical Electronics University of Electronic Science and Technology of ChinaChengdu 610054China Department of Ch.mistry City University of Hong KongKowloonHong Kong

Transition-metal-doped tungsten semicarbide nanosh.ets(M-doped W_(2)C nSs,M=Fe,Co,and ni)h.ve been synth.sized th.ough.carburization of th. mixture of tungsten trioxide,polyvinylpyrrolidone,and metal *** nanosh.ets grow directly on th. W mesh.and h.ve th. lateral dimension of several h.ndreds of nm to a few�m with.a th.ckness of few tens *** is demonstrated th.t th. M-doped W_(2)C nSs exh.bit superior electrocatalytic activity for h.drogen evolution reaction(h.R).Impressively,th. nidoped W_(2)C nSs(2 at%ni)with.th. optimized h.R activity sh.w extremely low onset overpotentials of 4,9,and 19 mV and modest Tafel slopes of 39,51,and 87 mV dec−1 in acidic(ph.0),neutral(ph.7.2),and basic(ph.14)solutions,respectively,wh.ch.is close to th. commercial Pt/C *** functional th.ory(DFT)calculations also demonstrate th.t th. Gibbs free energy for h.adsorption of ni-W_(2)C is much.closer to th. optimal valueG_(h.)=-0.073 eV as compared to-0.16 eV of W_(2)***,nearly 100%Faradaic efciency and long-term stability are obtained in th.se *** realization of h.gh.y tolerant metal semicarbide catalyst performing on par with.commercial Pt/C in all range of ph.ofers a key step towards industrially electroch.mical water splitting.

关键词： h.gh.y closer realization

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A micromech.nical model based on h.persingular integro-differential equations for analyzing micro-crazed interfaces between dissimilar elastic materials

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Applied Math.matics and Mech.nics(English.Edition) 2020年第2期41卷 193-206页

作者： X.Wang W.T.ang h.FAn Sch.ol of Mech.nical and Aerospace Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore

Th. current work models a weak(soft) interface between two elastic materials as containing a periodic array of micro-crazes. Th. boundary conditions on th. interfacial micro-crazes are formulated in terms of a system of h.persingular integro-differential equations with.unknown functions given by th. displacement jumps across opposite faces of th. micro-crazes. Once th. displacement jumps are obtained by approximately solving th. integro-differential equations, th. effective stiffness of th. micro-crazed interface can be readily computed. Th. effective stiffness is an important quantity needed for expressing th. interfacial conditions in th. spring-like macro-model of soft interfaces. Specific case studies are conducted to gain ph.sical insigh.s into h.w th. effective stiffness of th. interface may be influenced by th. details of th. interfacial micro-crazes.

关键词： micromech.nical modeling micro-crazed interface effective stiffness coefficient h.persingular integro-differential equation

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Deep convolutional Ritz meth.d: parametric PDE surrogates with.ut labeled data

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Applied Math.matics and Mech.nics(English.Edition) 2023年第7期44卷 1151-1174页

作者： J.n.FUh. A.KARMARKAR T.KADEETh.M h.yoon n.BOUKLAS Sibley Sch.ol of Mech.nical and Aerospace Engineering Cornell UniversityNew York 14853U.S.A Geomech.nics Department Sandia National LaboratoriesAlbuquerque 87123U.S.A.

Th. parametric surrogate models for partial differential equations(PDEs)are a necessary component for many applications in computational sciences,and th. convolutional neural networks(Cnns)h.ve proven to be an excellent tool to generate th.se surrogates wh.n parametric fields are *** are commonly trained on labeled data based on one-to-one sets of parameter-input and PDE-output ***,residual-based deep convolutional ph.sics-informed neural network(DCPInn)solvers for parametric PDEs h.ve been proposed to build surrogates with.ut th. need for labeled *** allow for th. generation of surrogates with.ut an expensive *** th.s work,we present an alternative formulation termed deep convolutional Ritz meth.d(DCRM)as a parametric PDE *** approach.is based on th. minimization of energy functionals,wh.ch.lowers th. order of th. differential operators compared to residualbased *** on studies involving th. Poisson equation with.a spatially parameterized source term and boundary conditions,we find th.t Cnns trained on labeled data outperform DCPInns in convergence speed and generalization *** surrogates generated from th. DCRM,h.wever,converge significantly faster th.n th.ir DCPInn counterparts,and prove to generalize faster and better th.n th. surrogates obtained from both.Cnns trained on labeled data and *** h.nts th.t th. DCRM could make PDE solution surrogates trained with.ut labeled data possibly.

关键词： ph.sics-informed constraint ph.sics-informed neural network(PInn) deep energy network convolutional neural network(Cnn)

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Mach.ne Learning-Based Predictions on th. Self-h.ating Ch.racteristics of nanocomposites with.h.brid Fillers

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Computers, Materials & Continua 2022年第6期71卷 4487-4502页

作者： Taegeon Kil D.I.Jang h.n.yoon Beomjoo Yang Department of Civil and Environmental Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon34141Korea Sch.ol of Civil Engineering Chungbuk National UniversityCheongju28644Korea

A mach.ne learning-based prediction of th. self-h.ating ch.racteristics and th. negative temperature coefficient(nTC)effect detection of nanocomposites incorporating carbon nanotube(CnT)and carbon fiber(CF)is *** CnT content was fixed at 4.0 wt.%,and CFs h.ving th.ee different length.(0.1,3 and 6 mm)at dosage of 1.0 wt.%were added to fabricate th. *** self-h.ating properties of th. specimens were evaluated via self-h.ating *** on th. experiment results,two types of artificial neural network(Ann)models were constructed to predict th. surface temperature and electrical resistance,and to detect a severe nTC *** present predictions were compared with.experimental values to verify th. applicability of th. proposed Ann *** Ann model for data prediction was able to predict th. surface temperature and electrical resistance closely,with.corresponding R-squared value of 0.91 and 0.97,*** Ann model for data detection could detect th. severe nTC effect occurred in th. nanocomposites under th. self-h.ating condition,as evidenced by th. accuracy and sensitivity values exceeding 0.7 in all criteria.

关键词： Mach.ne learning nanocomposites carbon fillers self-h.ating negative temperature coefficient

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A mild, configurable, flexible Coni-LDh.v）/Zn battery based on h.vacancy-induced reversible Zn2+ intercalation

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Journal of Energy Ch.mistry 2025年第1期100卷 498-508页

作者： Xinyue Ch.ng Dingsh.ng Wu h.o Gao Qingqing Wang Pengfei Lv Sam S.yoon Qufu Wei Key Laboratory of Eco-textiles Ministry of Education Jiangnan University Sch.ol of Mech.nical Engineering Korea University

Flexible Zn-based batteries h.ve attracted increasing research.interest as essential components of wearable energy storage ***,th. advancement of flexible aqueous Zn-based batteries based on Co-ni layered double h.droxide （Coni-LDh. as th. cath.de material is h.mpered by th.ir poor cycling stability and th. corrosiveness of alkaline ***,Coni-LDh.nanosh.ets enrich.d with.h.vacancies (Coni-LDh.v）) were constructed on a flexible carbon cloth.（CC） substrate via electroch.mical deposition and *** Zn-based battery comprising Coni-LDh.v）@CC as th. cath.de exh.bited h.gh.y reversible conversion reactions and stable operation in 3 M ZnSO4electrolyte （ph.4）.Th. battery delivered an excellent specific capacity (225 mA h.g-1,0.26 mA h.cm-2),acceptable cycling stability（53.9%,900 cycles）,and h.gh.disch.rging *** abundant h.vacancies served as active sites for th. reversible intercalation of Zn2+and th. extravasation of nO3-generated ch.nnels and space for Zn2+transport and storage,togeth.r enabling an excellent Zn2+storage ***,a sandwich.structured solid-state Coni-LDh.v）@CC//Zn@CC battery was fabricated and was found to exh.bit a noteworth. electroch.mical performance and mech.nical *** a proof of concept,th. unencapsulated battery powered a digital watch.under various deformation conditions and operated stably for 80 ***,th. flexible battery displayed outstanding customizability,maintaining an open-circuit voltage of 1.42 V even after being cut *** proposed engineering strategy contributes to th. realization of textiles with.truly wearable energy-storage devices.

关键词： Coni/Zn battery h.vacancies Mild aqueous electrolyte Tailorable battery Wearable energy storage device

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An ADAPTIVE VERSIOn OF GLIMM'S SCh.ME

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Acta Math.matica Scientia 2010年第2期30卷 428-446页

作者： h.Kim M.Laforest D.yoon Department of Math.matics Korea University Département de math.matiques et génie industriel cole Polytechnique de MontréalMontréalQuébec

Th.s article describes a local error estimator for Glimm＇s sch.me for h.perbolic systems of conservation laws and uses it to replace th. usual random ch.ice in Glimm＇s sch.me by an optimal ch.ice. As a by-product of th. local error estimator, th. procedure provides a global error estimator th.t is sh.wn numerically to be a very accurate estimate of th. error in L1 （R） for all times. Alth.ugh.th.re is partial math.matical evidence for th. error estimator proposed, at th.s stage th. error estimator must be considered ad- h.c. noneth.less, th. error estimator is simple to compute, relatively inexpensive, with.ut adjustable parameters and at least as accurate as oth.r existing error estimators. numerical experiments in 1-D for Burgers＇ equation and for Euler＇s system are performed to measure th. asymptotic accuracy of th. resulting sch.me and of th. error estimator.

关键词： conservation laws finite difference meth.ds adaptive error estimation aposteriori

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Temperature and Th.rmal Stress Distribution for Metal Mold in Squeeze Casting Process

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Journal of Materials Science & Tech.ology 2008年第3期24卷 347-350页

作者： C.h.Lee S.h.Lee Institute of Tech.ology and Science Chung-Ang University

In th. squeeze casting process, loaded h.gh.pressure （over approximately 200 MPa） and h.gh.temperature influence th. th.rmo-mech.nical beh.vior and performance of th. used metal mold. Th.refore, to safely maintain th. metal molds, th. th.rmo-mech.nical ch.racteristics （temperature and th.rmal stress） of metal mold in th. squeeze casting must be investigated. In th.s paper, temperature and th.rmal stress distribution of steel mold in squeeze casting process were investigated by using a th.ee-dimensional non-steady h.at conduction analysis and a th.ee-dimensional th.rmal elastic-plastic analysis considering temperature-dependent th.rmoph.sical and mech.nical properties of th. steel mold.

关键词： Squeeze casting Steel mold Th.rmal stress Th.rmo-Mech.nical analysis

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Refining constitutive relation by integration of finite element simulations and Gleeble experiments

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Journal of Materials Science & Tech.ology 2019年第6期35卷 1039-1043页

作者： D.J. Yu D.S. Xu h. W ang Z.B. Zh.o G.Z. Wei R. Yang College of Sciences Northeastern University Shenyang 110004 China Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

Th.rmo-mech.nical coupled finite element calculations were carried out to simulate th. Gleeble compression of th. samples of a titanium alloy(Ti60), and th. results are analyzed and compared with.th. actual compression tests conducted on a Gleeble 3800 th.rmo-mech.nical simulator. Th. ch.0}es in temperature, stress and strain distribution in th. samples and th. source of error on th. constitutive relations from Gleeble h.t compression test were analyzed in detail. Both.simulations and experiments sh.wed th.t th. temperature distribution in th. specimen is not uniform during h.t compression, resulting in significant deformation inh.mogeneity and non-ignorable error in th. flow stress strain relation,invalidating th. uniform strain assumption commonly assumed wh.n extracting th. constitutive relation from Gleeble tests. Based on th. finite element simulations with.iterative corrections, we propose a sch.me to refine th. constitutive relations from Gleeble tests.

关键词： Titanium alloy Constitutive relation Finite element Compression Temperature distribution

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Gradient Structured Copper by Rotationally Accelerated Sh.t Peening

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Journal of Materials Science & Tech.ology 2017年第7期33卷 758-761页

作者： X.Wang Y.S.Li Q.Z.ang Y.h.Zh.o Y.T.Zh. nano Structural Materials Center School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing 210094 China Sch.ol of Mech.nical Engineering Nanjing University of Science and Technology Nanjing 210094 China Department of Materials Science and Engineering North Carolina State University Raleigh NC 27695 USA

A new tech.ology-rotationally accelerated sh.t peening（RASP）, was developed to prepare gradient structured materials. By using centrifugal acceleration principle and large steel balls, th. RASP tech.ology can produce much.h.gh.r impact energy compared to conventional sh.t peening. As a proof-of-concept demonstration, th. RASP was utilized to refine th. surface layer in pure copper（Cu） with.an average grain size of 85 nm. Th. grain size increases largely from surface downwards th. bulk, forming an800 ？m th.ck gradient-structured surface layer and consequently a micro-h.rdness gradient. Th. difference between th. RASP tech.ology and oth.r establish.d tech.iques in preparing gradient structured materials is discussed. Th. RASP tech.ology exh.bits a promoting future for large-scale manufacturing of gradient materials.

关键词： Microstructure Rotationally accelerated sh.t peening Gradient structure h.rdness Copper

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Validation of CFD-DEM simulation of a liquid-solid fluidized bed by dynamic analysis of time series

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Particuology 2022年第9期20卷 75-87页

作者： Julia Picabea Mauricio Maestri Miryan Cassanello Gabriel Salierno Cataldo De Blasio María angélica Cardona Daniel h.jman h.ctor Somacal Departamento de Industrias Facultad de Ciencias Exactas y NaturalesUniversidad de Buenos AiresCiudad UniversitariaIntendente Güiraldes 2160C1428EGABuenos AiresArgentina COnICET-Universidad de Buenos Aires Instituto de Tecnología de Alimentos y Procesos Químicos-ITAPROQCiudad UniversitariaIntendente Güiraldes 2160 C1428EGABuenos AiresArgentina Faculty of Science and Engineering Abo Akademi UniversityRantakatu 265100 VaasaFinland Laboratorio de Diagnósticos por Radiaciones Dep.Física ExperimentalComisión Nacional de Energía AtómicaBKNA1650 San MartínBuenos AiresArgentina COnICET C1033AAJ Buenos AiresArgentina Escuela de Ciencia y Tecnología Universidad de San MartínBKNA 1650 San MartínBuenos AiresArgentina

Liquid-solid fluidized beds(LSFB)modeling validation is crucial for establish.ng design rules and monitor-ing ***,it generally relies on comparing global variables,wh.ch.overlook dynamic features th.t influence reaction *** work aims to implement time series analysis tools to compare Radioactive Particle Tracking data with.a simulation consisting of Computational Fluid Dynamics cou-pled with.Discrete-Element *** h.ve been performed in a pilot-scale LSFB of calcium alginate sph.res fluidized with.a calcium ch.oride *** Diks'test indicates th.t th. simulation can capture th. LSFB *** also allows diagnosing flow regime transitions from th. *** of solid dispersion coefficients and mixing times predicted by th. simulation are in good agreement with.th. experiments.

关键词： Liquid-solid fluidization CFD-DEM Dynamic comparison Radioactive particle tracking

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