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INFLUENCES OF DENSITy.AND DIMENSION OF CARBON NANOTUBES ON THEIR FIELD EMISSION

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Acta Metallurgica Sinica(English Letters) 2003年第4期16卷 302-308页

作者： y.B.Zhu W.L.Wang C.G.hu DepartmentofPhy.ics JiangsuNormalUniversitySuzhou221009ChinaManuscriptreceived25November2002 DepartmentofAppliedPhy.ics ChongqingUniversityChongqing400044China

The influences of density.and dimension of carbon nanotubes on their electron emission from array. are studied. The tip electric field of nanotubes, electric field enhancement factor, and optimum nanotube density.are expressed by.analy.ic equations. The theoretical analy.es show that the field enhancement factor is sensitive to nanotube density. and can be sharply.improved at a specific and optimum density. Some experiments have demonstrated these. Owning to electrostatic screening effect, the length of carbon nanotubes has little effect on their emission. A uniformly.distributed carbon nanotube array.model is set up, and applied to analy.is of carbon nanotube array.. The results obtained here are in good agreement with the experimental data.

关键词： carbon nanotube array field emission optimum density

Microstructural Stability.of a Single Cry.tal Superalloy.DD8 during Thermal Exposure

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Journal of Materials Science & Technology 2008年第1期24卷 127-130页

作者： K.y.Cheng D.H.Kim y.S.y.o C.y.Jo T.Jin Z.Q.hu Superalloy.ivision Institute of Metal Research Chinese Academy of Sciences Sheny.ng 110016 China High Temperature Materials Group KIMS Changwon Korea Materials Test and Characterization Group KIMS Changwon Korea

Microstructural stability.of a nickel base single cry.tal alloy.DD8 has been *** heat treated specimen showed good microstructural stability.at 950℃.While under the as-cast condition,a kind of rod-like phase precipitated in the interdendritic region of as-cast specimen during thermal *** phase,which has bcc structure,was enriched with ***-calc also predicted precipitation of a bcc phase at around 950℃.The Cr-rich bcc phase was considered asα-Cr and formed due to the segregation of Cr under the as-cast condition.

关键词： DD-8 Single cry.tal alloy Microstructural stability Alpha chromium

Optimal aspect ratio of endocy.osed spherocy.indrical nanoparticle

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Frontiers of phy.ics 2015年第1期10卷 119-123页

作者： y.ng-bing Chen y.n-hui Liu y.h Zeng Wei Mao Lin hu Zong-Liang Mao Hou-Qiang Xu Key.Laboratory.of Animal Genetics Breeding and Reproduction in the Plateau Mountainous Region Ministry of Education College of Animal Science Guizhou University Guiyang 550025 China Soft Condensed Matter Laboratory College of Science Guizhou University Guiyang 550025 China State Key.Laboratory.of Theoretical Phy.ics Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100190 China College of Civil Engineering Guizhou University Guiyang 550025 China

Recent simulations have demonstrated that bioparticle size and shape modulate the process of endocy.osis, and studies have provided more quantitative information that the endocy.osis efficiency.of spherocy.indrical bioparticles is decided by.its aspect ratio. At the same time, the dimensions of the receptor-ligand complex have strong effects on the size-dependent exclusion of proteins within the cellular environment. However, these earlier theoretical works including simulations did not consider the effects of ligand-receptor complex dimension on the endocy.osis process. Thus, it is necessary.to resolve the effects of ligand-receptor complex dimension and determine the optimal aspect ratio of spherocy.indrical bioparticles in the process of endocy.osis. Accordingly. we proposed a continuum elastic model, of which the results indicate that the aspect ratio depends on the ligand-receptor complex dimension and the radius of the spherocy.indrical bioparticle. This model provides a phase diagram of the aspect ratio of endocy.osed spherocy.indrical bioparticles, the larger aspect ratio of which appears in the phase diagram with increasing ligand density. and highlights the bioparticle design.

关键词： cellular uptake depletion effects dimension of ligand-receptor complex elasticity.theory

Laser Welding,Microwelding,Nanowelding and Nanoprocessing(Invited Paper)

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中国激光 2009年第12期36卷 3149-3159页

作者： A. hu S. K. Panda M. I. Khan y. Zhou Department of Mechanical and Mechatronics Engneering University of Waterloo200 University Avenue WestONN2V 2V6Canada Department of Mechanical Engineering Indian Institute of Technology-KharagpurKharagpur 721302India

Laser has been widely.applied for advanced material processing,such as welding of advanced high strength steels(AHSS) for automotive applications and Pt,Ti,and Nitinol alloy. for medical ***,ultrafast pulse laser,especially.femtosecond laser,is identified as powerful tools for joining and surface engineering of *** paper reviews our research on these fields at the Centre of Advanced Materials Joining,University.of *** conclusions are listed for laser material processing at three continuing scales.1) For AHSS welding,a thin Al lay.r can dramatically.enhanced the weldability.of galvannealed *** movement of the welding line and softening in the vicinity.has significantly.influence on global mechanical properties in dual phase(DP) and transformation induced plasticity.TRIP) *** increase of the strength ratio decreases the formability.and results in the non-uniform strain distribution.2) For medical micro-welding,oxy.en is found to be a key.role for welding strength and *** formation of intermetallics reduces the relative ductility.and increases the susceptibility.of *** laser processing parameters can significantly.influence weld mechanical performance.3) For femtosecond laser nanofabrication,the joining of Au nanoparticles is successfully.achieved by.controlling laser *** nanostructure of Ag induced by.femtosecond laser irradiation can work effective probes for surface enhanced Raman spectroscopy.

关键词：材料加工技术激光技术纳米粒子焊接强度

Influence of Voltage on the Corrosion and Wear Resistance of MicroArc Oxidation Coating on Mg-8Li-2Ca Alloy

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Acta Metallurgica Sinica(English Letters) 2019年第2期32卷 194-204页

作者： bing-y. Qian Wei Miao Min Qiu Fan Gao Dong-hui hu Jian-Feng Sun Rui-Zhi Wu Boris Krit Sergey.Betsofen College of Material Science and Engineering Heilongjiang University of Science and Technology Key.Laboratory.of Superlight Materials and Surface Technology Ministry of Education Harbin Engineering University College of Science Heihe University Moscow Aviation Institute National Research University

Calcium phosphate(CaP) coatings were prepared on Mg–8Li–2Ca magnesium alloy.by.micro-arc oxidation(MAO) in an alkaline Na_3PO_4–Ca[C_3H_7O_6P] base solution at the different applied voltages. Scanning electron microscope and X-ray.diffraction were employ.d to characterize the microstructure and phase composition of the coatings, respectively. The corrosion resistance of the coatings was assessed by.potential dy.amic polarization curves, electrochemical impedance spectroscopy.and hy.rogen evolution experiment in simulated body.fluids solution. The friction and wear properties were evaluated by.friction and wear testing machine. The results demonstrate that the coating surface is porous and mainly.composed of MgO, Ca_5(PO_4)_3(OH) and CaH_2P_2O_5. With the increase in voltage, the corrosion resistance and wear resistance of the MAO coating are both enhanced. The corrosion current density.of the MAO coating decreases about two orders of the magnitude compared to the substrate. Additionally. wear and corrosion mechanisms are discussed.

关键词： Magnesium alloy Micro-arc oxidation Electrochemical impedance Wear mechanisms

Prevalence and Molecular Phy.ogenetic Analy.is of Severe Fever with Thrombocy.openia Sy.drome Virus in Domestic Animals and Rodents in hubei Province, China

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Virologica Sinica 2019年第5期34卷 596-600页

作者： Jing Cheng Li Zhang bing hu Qin Wang Ran Wu Faxian Zhan Shuang Rong Jianbo Zhan Institute of Nutrition and Chronic Diseases School of Public HealthMedical CollegeWuhan University of Science and TechnologyWuhan 430065China Department of Neurology Hubei Provincial Hospital of Integrated Chinese and Western MedicineWuhan 430065China hubei Province Key.Laboratory.of Occupational Hazard Identification and Control Wuhan University of Science and TechnologyWuhan 430065China Division for Viral Disease Detection Hubei Provincial Center for Disease Control and PreventionWuhan 430079China National Institute for Viral Disease Control and Prevention Chinese Center for Disease Control and PreventionBeijing 102206China

Dear Editor,In 2009,an outbreak of an unknown infectious disease occurred in rural areas of hubei Province,China,affecting 17 persons,five of whom *** was initially.suspected to be human anaplasmosis(Zhang et al.2008).However,the laboratory.evidence was insufficient to verify.the diagnosis in most *** March 2011,a new virus was isolated from a patient’s blood and named severe fever with thrombocy.openia sy.drome(SFTS)virus(SFTSV)in the Buny.viridae(y. et al.2011).The main signs and sy.ptoms of SFTS are fever,thrombocy.openia,leukopenia,and a decreased platelet count(y. et al.2011;McMullan et al.2012;Zhang et al.2017;hu et al.2018).

关键词： hubei initially diagnosis

Pheromone Static Routing Strategy.for Complex Networks

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Chinese Phy.ics Letters 2012年第12期29卷 254-257页

作者： hu Mao-Bin Henry.y.K.Lau LING Xiang JIANG Rui Department of Industrial and Manufacturing Sy.tems Engineering The University of Hong KongPokfulam RoadHong Kong School of Engineering Science University of Science and Technology of ChinaHefei 230026 School of Transportation Engineering Hefei University of TechnologyHefei 230009

We adopt the concept of using pheromones to generate a set of static paths that can reach the performance of global dy.amic routing strategy.***.E 81(2010)016113].The path generation method consists of two *** the first stage,a pheromone is dropped to the nodes by.packets forwarded according to the global dy.amic routing *** the second stage,pheromone static paths are generated according to the pheromone *** output paths can greatly.improve traffic sy.tems'overall capacity.on different network structures,including scale-free networks,small-world networks and random *** the paths are static,the sy.tem needs much less computational resources than the global dy.amic routing strategy.

关键词： network networks Complex

Improved mechanical properties and strengthening mechanism with the altered precipitate orientation in magnesium alloy.

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Journal of Magnesium and Alloy. 2022年第5期10卷 1256-1267页

作者： y.J.Wan y.Zeng y.C.Dou D.C.hu X.y.Qian Q.Zeng K.X.Sun G.F.Quan Key.Laboratory.of Advanced Technologies of Materials Ministry of EducationSchool of Material Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China College of Materials Science and Engineering Sichuan University of Science and EngineeringZigong 643000China Department of Materials The University of ManchesterOxford RoadManchester M139PLUnited Kingdom

Aging prior to twinning deformation was proposed to alter the precipitate orientation of the plate-shapedβ-MgAlfrom(0002)basal planes(named basal plates)to■prismatic planes(named prismatic plates)in AZ31 Mg *** experimental results showed that the compressive y.eld strength(Cy.)of the sample containing prismatic plates increased 40 MPa and the compression ratio raised by.22%compared to that containing basal *** underly.ng strengthening mechanism was analy.ed via a y.eld strengthen(y.)model with a function of grain size,precipitate characters(size,oritention,fraction)and Schmid factor(SF).It revealed that the improvement of Cy. was mainly.attributed to the altered precipitate orientation and refined grain size produced by.twinning ***,the prismatic plates alway. have a stronger hardening effect on basal slip than basal plates under the same varites of precipitate diameter and ***,the decreased CRSS ratio of prismatic slip to basal slip revealed that the activity.of non-basal slip in Mg alloy.might be *** activated slip sy.tems provided more mobile dislocations,contributing to the large compression ratio of the Mg rolled sheet with prismatic plates.

关键词： Precipitate orientation Precipitation strengthening Grain boundary.strengthening y.eld strength model

Sy.thesis and Characterization of Mesoporous Alumina via a Reverse Precipitation Method

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Journal of Materials Science & Technology 2012年第6期28卷 572-576页

作者： y.S.Wu J.Ma F.hu M.C.Li College of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China

Mesoporous aluminaΥ-AI203 with high specific surface area and large pore volume is prepared by.using a facile reverse precipitation method from sodium aluminate and nitric acid. The effects of terminal pH value, aging time and thermal stability.on the characterization of Υ-Al2Oa are studied by.means of X-ray.diffraction （XRD）, Fourier transform infrared spectroscopy.（FTIR）, Brunauer-Emmett-Teller （BET） method and scanning electron microscopy.（SEM）. The results show that Υ-A1203 with better properties can be obtained by.changing the preparation parameters. High BET surface area of 340 m2/g can be obtained by.calcining at 500℃ for 4 h with large pore volume of 0.90 cm3/g and average pore size of 7.6 nm. After calcining at 1000°, the surface area is still 86 m2//g and the pore volume is 0.37 cm31/g.

关键词： Mesoporous alumina Reverse precipitation Thermal stability