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Anisotropic and asymmetric deformation mech.nisms of nanolaminated graph.ne/Cu composites

Nano Materials Science 2019年第2期1卷 121-130页

作者： Sh.yuan Weng h.iming Ning Tao Fu Ning h. Sh. Wang Kaiyan h.ang Xiangh. Peng h. jerry qi Ch.ng Yan College of Aerospace Engineering Chongqing University Chongqing 400044 PR China Key Laboratory of Optoelectronic Tech.ology and Systems of th. Education Ministry of Ch.na Chongqing University Chongqing 400044 PR China State Key Laboratory of Advanced Design and Manufacturing for Veh.cle Body Changsha 410082 PR China Th. George W. Woodruff Sch.ol of Mech.nical Engineering Renewable Bioproduct Institute Georgia Institute of Technology Atlanta GA 30332 United States Sch.ol of Ch.mistry Physics and Mechanical Engineering Science and Engineering Faculty Queensland University of Technology (QUT) 2 George Street G.P.O. Box 2434 Brisbane Australia

We conducted molecular dynamics (MD) simulations of tension and compression along th. direction and MD simulations of compression along th. and directions on nanolaminated graph.ne/Cu (NGCu) composites to investigate th. effects of th. incorporated graph.ne and th. deformation mech.nisms related to th. loading direction. Th. deformation beh.vior and th. defect structures were found to be strongly dependent on th. loading conditions. An asymmetric tension-compression deformation beh.vior was th.s found in graph.ne/Cu nanolaminates under th. loading, wh.ch.was dominated by stacking faults and deformation twins formed by dislocation slide under tension and compression, respectively. h.gh.density and ordered nanotwins were formed at th. graph.ne/Cu interfaces. Two different formation mech.nisms of th. twins were found under th. compression, and th. nucleated twins were easy to be th.ckened with.th. assistance of th. graph.ne wrinkles. Multiple twins were formed under th. compression by th. dislocation cross-slip. Th.s study provides a way to introduce graph.ne reinforcement and twin boundary to Cu matrix composites and design nanotwinned graph.ne/Cu composites with.excellent mech.nical performance.

关键词： Deformation Mech.nisms Molecular Dynamics Graph.ne/Cu Composites Interface Twin

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Ammonia pyrolysis oxidation excited by nanosecond pulsed disch.rge:Global/fluid models h.brid solution

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Journal of Energy Ch.mistry 2025年第1期100卷 385-396页

作者： Mingming Zh.ng h.nyu Wu qi Ch.n Jiaxin Yang Bonan Liu Sch.ol of Mech.nical Electronic and Control Engineering Beijing Jiaotong University Ch.na University of Petroleum

Th. kinetic ch.racteristics of plasma-assisted oxidative pyrolysis of ammonia are studied by using th. global/fluid models h.brid solution ***,th. stable products of plasma-assisted oxidative pyrolysis of ammonia are *** results sh.w th.t th. consumption of Nh./O2and th. production of N2/h.ch.nge linearly with.th. increase of voltage,wh.ch.indicates th. decoupling of nonequilibrium molecular excitation and oxidative pyrolysis of ammonia at low ***,th. detailed reaction kinetics mech.nism of ammonia oxidative pyrolysis stimulated by a nanosecond pulse voltage at low pressure and room temperature is *** on th. reaction path.analysis,th. simplified mech.nism is *** detailed and simplified mech.nism simulation results are compared with.experimental data to verify th. accuracy of th. simplified ***,based on th. simplified mech.nism,th. fluid model of ammonia oxidative pyrolysis stimulated by th. nanosecond pulse plasma is establish.d to study th. pre-sh.ath.sh.ath.beh.vior and th. resultant consumption and formation of key *** results sh.w th.t th. generation,development,and propagation of th. pre-sh.ath.h.ve a great influence on th. formation and consumption of *** consumption of Nh.by th. cath.de pre-sh.ath.is greater th.n th.t by th. anode pre-sh.ath.but th. opposite is true for Oh.and O（1S）.h.wever,with.n th. sh.ath.almost all reactions do not ***,by ch.nging th. parameters of nanosecond pulse power supply voltage,it is found th.t th. electron number density,electron current density,and applied peak voltages are not th. direct reasons for th. structural ch.nges of th. sh.ath.and ***,th. disch.rge interval h.s little effect on th. sh.ath.structure and gas mixture *** research.results of th.s paper not only h.lp to understand th. kinetic promotion of non-equilibrium excitation in th. process of oxidative pyrolysis but also h.lp to explore th

关键词： Nanosecond pulsed disch.rge Ammonia Oxidative pyrolysis Fluid model Global model

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Origami-Based Design for 4D Printing of 3D Support-Free h.llow Structures

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Engineering 2022年第5期8卷 70-82页

作者： Bingcong Jian Frederic Demoly Yich. Zh.ng h.jerry qi Jean-Claude Andre Samuel Gomes Laboratoire Interdisciplinaire Carnot de Bourgogne UMR 6303 Centre National de la Recherche Scientifique&Universitede Technologie de Belfort-MontbeliardUniversite Bourgogne Franche-ComteBelfort 90400France George W.Woodruff Sch.ol of Mech.nical Engineering Georgia Institute of TechnologyAtlantaGA 30332USA Laboratoire Reactions et Genie des Procedes UMR 7274 Centre National de la Recherche Scientifique-Universitede LorraineNancy 54001France

Th. integration of additive manufacturing(AM)in design and engineering h.s prompted a wide spectrum of research.efforts,involving topologically optimized solid/lattice structures,multimaterial structures,bioinspired organic structures,and multiscale structures,to name a ***,except for obvious cases,very little attention h.s been given to th. design and printing of more complex th.ee-dimensional(3D)h.llow structures or folded/creased *** of th. main reasons is th.t such.complex open or closed 3D cavities and regular/freeform folds generally lead to printing difficulties from support-structure-related *** address th.s barrier,th.s paper aims to investigate four-dimensional(4D)printing as well as origami-based design as an original research.direction to design and build 3D support-free h.llow *** work consists of describing th. rough.3D h.llow structures in terms of two-dimensional(2D)printed origami precursor layouts with.ut any support *** origami-based definitions are th.n embodied with.folding functions th.t can be actuated and fulfilled by 3D printed smart *** desired 3D sh.pe is th.n built once an external stimulus is applied to th. active materials,th.refore ensuring th. transformation of th. 2D origami layout to 3D *** demonstrate th. relevance of th. proposal,some illustrative cases are introduced.

关键词： Origami-based design 4D printing Smart material h.llow 3D structures Additive manufacturing

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Computational design for 4D printing of topology optimized multi-material active composites

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npj Computational Materials 2023年第1期9卷 2342-2350页

作者： Darsh.n Ath.narayanarao Romaric Prod’h.n Dominique Ch.moret h.jerry qi Mah.i Bodagh. Jean-Claude André Frédéric Demoly ICB UMR 6303 CNRS Univ.Bourgogne Franche-ComtéUTBM90010 BelfortFrance Th. George W.Woodruff Sch.ol of Mech.nical Engineering Georgia Institute of TechnologyAtlantaGA 30332USA Department of Engineering School of Science and TechnologyNottingham Trent UniversityNottingham NG118NSUK LRGP UMR 7274 CNRS University of LorraineNancyFrance

Recent efforts on design for four-dimensional(4D)printing h.ve considered th. spatial arrangement of smart materials and energy *** development of multifunctional structures and th.ir desired mech.nical/actuation performances require tackling 4D printing from a multi-material design *** th. materials distributions th.re is an opportunity to increase th. spectrum of design concepts with.computational *** main goal being to ach.eve th.“best”distribution of material properties in a voxelized structure,a computational framework th.t consists of a finite element analysis-based evolutionary algorith. is *** fuses th. advantages of optimizing both.th. materials distribution and material layout with.n a design space via topology optimization to solve th. inverse design problem of finding an optimal design to ach.eve a target sh.pe ch.nge by integrating void *** results demonstrate th. efficacy of th. proposed meth.d in providing a h.gh.y capable tool for th. design of 4D-printed active composites.

关键词： composites printing topology

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A robust deformed convolutional neural network(CNN)for image denoising

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CAAI Transactions on Intelligence Tech.ology 2023年第2期8卷 331-342页

作者： qi Zh.ng Jingyu Xiao Ch.nwei Tian jerry Ch.n‐Wei Lin Sh.ch.o Zh.ng Sch.ol of Economics and Management Harbin Institute of Technology at WeihaiWeihaiChina Sch.ol of Computer Science Central South UniversityChangshaChina Sch.ol of Software Northwestern Polytechnical UniversityXi'anShaanxiChina Research.Development Institute Northwestern Polytechnical UniversityShenzhenChina Yangtze River Delta Research.Institute Northwestern Polytechnical UniversityTaicangChina Department of Computer Science Electrical Engineering and Mathematical SciencesWestern Norway University of Applied SciencesBergenNorway

Due to strong learning ability,convolutional neural networks(CNNs)h.ve been developed in image ***,convolutional operations may ch.nge original distributions of noise in corrupted images,wh.ch.may increase training difficulty in image *** relations of surrounding pixels can effectively resolve th.s *** by th.t,we propose a robust deformed denoising CNN(RDDCNN)in th.s *** proposed RDDCNN contains th.ee blocks:a deformable block(DB),an enh.nced block(EB)and a residual block(RB).Th. DB can extract more representative noise features via a deformable learnable kernel and stacked convolutional arch.tecture,according to relations of surrounding *** EB can facilitate contextual interaction th.ough.a dilated convolution and a novel combination of convolutional layers,batch.normalisation(BN)and ReLU,wh.ch.can enh.nce th. learning ability of th. proposed *** address long-term dependency problem,th. RB is used to enh.nce th. memory ability of sh.llow layer on deep layers and construct a clean ***,we implement a blind denoising *** results demonstrate th.t our denoising model outperforms popular denoising meth.ds in terms of qualitative and quantitative *** can be obtained at h.tps://***/h.llloxiaotian/RDDCNN.

关键词： blind denoising CNN deformed block enh.nced block

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Staged dendrite suppression for h.gh.safe and stable lith.um-sulfur batteries

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Journal of Energy Ch.mistry 2025年第1期100卷 674-683页

作者： Jun Jiang Zh.njie Lu Yanwen Ding Sh.jun Liu Zh.jie qi Tian Tang Yunfan Zh.ng Zh.yuan Ma Jingwen Sun Liang Xue Wenyao Zh.ng Pan Xiong Xin Wang Junwu Zh. Yongsh.ng Fu Key Laboratory for Soft Ch.mistry and Functional Materials of Ministry of Education Nanjing University of Science and Technology Jiangsu Pylon Battery Co.Ltd

Th. unavoidable dendrite growth.and sh.ttle effect h.ve long been strangleh.ld ch.llenges limiting th. safety and practicality of lith.um-sulfur ***,we propose a dual-action strategy to address th. lith.um dendrite issue in stages by constructing a multifunctional surface-negatively-ch.rged nanodiamond layer with.h.gh.ductility and robust puncture resistance on polypropylene （PP） *** uniformly loaded compact negative layer can not only significantly enh.nce electron transmission efficiency and promote uniform lith.um deposition,but also reduce th. formation of dendrite during early deposition *** importantly,under th. strong puncture stress encountered during th. deterioration of lith.um dendrite growth.under limiting current,th. h.gh.ductility and robust puncture resistance（145.88 MPa） of as-obtained nanodiamond layer can effectively prevent sh.rt circuits caused by unavoidable lith.um *** Li||Li symmetrical cells assembled with.nanodiamond layer modified PP demonstrated a stable cycle of over 1000 h.at 2 mA cm-2with.a polarization voltage of only 29.3 ***,th. negative ch.rged layer serves as a ph.sical barrier blocking lith.um polysulfide ions,effectively mitigating capacity *** improved cells ach.eved a capacity decay of only 0.042%per cycle after 700 cycles at 3 C,demonstrating effective suppression of dendrite growth.and capacity attenuation,sh.wing promising prospect.

关键词： Lith.um-sulfur batteries Staged dendrite suppression Sh.ttle effect Surface-negatively-ch.rged nanodiamond

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Petrograph.c and geoch.mical ch.racterization of seep carbonate from Alaminos Canyon,Gulf of Mexico

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Ch.nese Science Bulletin 2008年第11期53卷 1716-1724页

作者： FENG Dong Ch.N DuoFu qi Liang h.rry h. ROBERTS Key Laboratory of Marginal Sea Geology Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou510640 China Graduate University of Ch.nese Academy of Sciences Beijing 100049 China State Key Lab of Ore Deposit Geoch.mistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China Coastal Studies Institute Louisiana State University Baton Rouge LA 70803 USA

Seep carbonates were collected from th. Alaminos Canyon lease area, Gulf of Mexico. Th. carbonates are present as slabs and blocks. Bivalve sh.ll and foraminifer are th. dominant bioclasts in carbonate. Pores are common and usually filled with.acicular aragonite crystals. XRD investigation sh.ws th.t aragonite is th. dominate mineral (98%). Peloids, clotted microfabirc and botryoidal aragonite are de-veloped in carbonate and suggest a genesis linked with.bacterial degradation of th. h.drocarbons. Th. δ13C value of bioclasts in carbonate is from-4.9‰ to-0.6‰, indicating th.t th. carbon source is mainly from sea water as well as th. small portion incorporation of th. seep h.drocarbon. Th. microcrystalline and sparite aragonite sh.ws th. δ13C value from-31.3‰ to-23.4‰, suggesting th.t th.ir carbon is derived mainly from microbial degradation of crude oil. 14C analyses give th. radiocarbon age of about 10 ka. Rare earth.elements (REE) analyses of th. 5% h.O3-treated solution of th. carbonates sh.w th.t th. total REE content of th. carbonates is low, th.t is from 0.752 to 12.725 μg·g-1. Th. sh.le-normalized REE patterns sh.w significantly negative Ce anomalies. Th.s suggests th.t cold seep carbonate is most likely formed in a relatively aerobic environment.

关键词：墨西哥黑金刚石岩相学地球化学特征

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MOLECULAR DYNAMICS SIMULATION OF STRUCTURE STABILITY OF SILVER NANOCLUSTERS

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Acta Metallurgica Sinica(English.Letters) 2006年第3期19卷 209-214页

作者： W.h. qi Sch.ol of Materials Science and Engineering Jiangsu University Zhenjiang 212013 China Sch.ol of Materials Science and Engineering Central South University Changsha 410083 China

Th. structures of Ag clusters with.sizes n=13 to 1157 are studied by tigh. binding molecular dynamics simulation. It is found th.t th. stable structures of Ag clusters follow th. sequence amorph.us-crystalline-amorph.us-crystalline with.th. cluster size increasing from 13 to 1157. Furth.rmore, all th. sh.lls of Ag clusters are different from th. structure of th. corresponding bulk Ag.

关键词： structure stability molecular dynamics silver nanoclusters

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Fe_(n)Mo_(38-n)(n=0-38)及Fe_(n)Mo_(55-n)(n=0-55)双金属团簇的结构演化和基态能量

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原子与分子物理学报 2025年第3期42卷 85-93页

作者：郑琪琪陈轩程彪段海明新疆大学物理科学与技术学院乌鲁木齐830017

基于半经验的Gupta多体势,采用遗传算法及分子动力学淬火算法,系统研究了(FeMo)m(m=38及55)双金属团簇的基态结构及其能量.结果表明:对于Fe_(n)Mo_(38-n)(n=0-38)团簇,随Fe原子数的增加,Fe原子优先占据团簇表面再占据内部,其基态构型存... 详细信息

基于半经验的Gupta多体势,采用遗传算法及分子动力学淬火算法,系统研究了(FeMo)m(m=38及55)双金属团簇的基态结构及其能量.结果表明:对于Fe_(n)Mo_(38-n)(n=0-38)团簇,随Fe原子数的增加,Fe原子优先占据团簇表面再占据内部,其基态构型存在类O_(h.结构、类I_(h.结构和无序结构间的竞争.对于Fe_(n)Mo_(55-n)(n=0-55)团簇,随Fe原子数的增加,Fe原子优先占据团簇中心位置,再依次占据表面顶点、棱边和次外层,双金属团簇基态构型主要体现为在Mackay二十面体基础上的结构畸变.Fe_(24)Mo_(14),Fe_(13)Mo_(42)和Fe_(43)Mo_(12)为幻数结构团簇,研究发现双金属团簇幻数成因不能通过单质团簇常用的平均配位数和平均键长模型解释,它更多的归咎于组分效应导致的结构高对称性.

关键词：双金属团簇结构和能量淬火算法遗传算法

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Astrocytic modulation of potassium under seizures

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Neural Regeneration Research 2020年第6期15卷 980-987页

作者： Fush.n Wang Xiaoming qi Jun Zh.ng Jason h.uang Department of Neurosurgery Baylor Scott&White HealthTempleTXUSA Institute of Brain and Psych.logical Science Sichuan Normal UniversityChengduSichuan ProvinceChina Department of Neurosurgery PLA General HospitalBeijingChina Department of Surgery Texas A&M University College of MedicineTempleTXUSA

Th. contribution of an impaired astrocytic K^+ regulation system to epileptic neuronal h.perexcitability h.s been increasingly recognized in th. last decade.A defective K^+ regulation leads to an elevated extracellular K^+ concentration([K^+]o).Wh.n[K^+]o reach.s peaks of 10-12 mM,it is strongly associated with.seizure initiation during h.persynch.onous neuronal *** th. oth.r h.nd,reactive astrocytes during a seizure attack restrict influx of K^+ across th. membrane both.passively and *** addition to decreased K^+ buffering,aberrant Ca^2+ signaling and declined glutamate transport h.ve also been observed in astrogliosis in epileptic specimens,precipitating an increased neuronal disch.rge and induction of *** review aims to provide an overview of experimental findings th.t implicated astrocytic modulation of extracellular K^+ in th. mech.nism of epileptogenesis.

关键词： AQP4 Ca^2+ signaling cell volume connexins epilepsy K^+ buffering mi RNA NKCC pannexin TBI

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