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Doubly periodic patterns of modulated h.drodynamic waves:exact solutions of th. Davey-Stewartson system

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Acta Mech.nica Sinica 2011年第5期27卷 620-626页

作者： J.-h. Li S.-Y. Lou k.-W. Ch.w Department of Mech.nical Engineering University of Hong Kong Pokfulam Road Hong Kong China Department of Ph.sics Shanghai Jiao Tong University200030 Shanghai China

Exact doubly periodic standing wave patterns of th. Davey-Stewartson （DS） equations are derived in terms of rational expressions of elliptic *** fluid mech.nics,DS equations govern th. evolution of weakly nonlinear,free surface wave packets wh.n long wavelength.modulations in two mutually perpendicular,h.rizontal directions are *** functions with.two different moduli （periods） are necessary in th. two *** relation between th. moduli and th. wave numbers constitutes th. dispersion relation of such.*** th. long wave limit,localized pulses are recovered.

关键词： Free surface waves · Periodic patterns · DaveyStewartson equations

Experimental investigations of th. functional morph.logy of dragonfly wings

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Ch.nese Ph.sics B 2013年第8期22卷 738-745页

作者： h. Rajabi A. Darvizeh Department of Mech.nical Engineering Faculty of Engineering The University of GuilanRasht Iran

Nowadays, th. importance of identifying th. fligh. mech.nisms of th. dragonfly, as an inspiration for designing flapping wing veh.cles, is well known. An experimental approach.to understanding th. complexities of insect wings as organs of fligh. could provide significant outcomes for design purposes. In th.s paper, a compreh.nsive investigation is carried out on th. morph.logical and microstructural features of dragonfly wings. Scanning electron microscopy （SEM） and tensile testing are used to experimentally verify th. functional roles of different parts of th. wings. A number of SEM images of th. elements of th. wings, such.as th. nodus, leading edge, trailing edge, and vein sections, wh.ch.play dominant roles in strength.ning th. wh.le structure, are presented. Th. results from th. tensile tests indicate th.t th. nodus migh. be th. critical region of th. wing th.t is subjected to h.gh.tensile stresses. Considering th. patterns of th. longitudinal corrugations of th. wings obtained in th.s paper, it can be supposed th.t th.y increase th. load-bearing capacity, giving th. wings an ability to tolerate dynamic loading conditions. In addition, it is suggested th.t th. longitudinal veins, along with.th. leading and trailing edges, are structural mech.nisms th.t furth.r improve fatigue resistance by providing h.gh.r fracture tough.ess, preventing crack propagation, and allowing th. wings to sustain a significant amount of damage with.ut loss of strength.

关键词： dragonfly wings SEM tensile test nodus longitudinal corrugation

Quantifying th. Microstructures of Pure Cu Subjected to Dynamic Plastic Deformation at Cryogenic Temperature

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Journal of Materials Science & Tech.ology 2011年第8期27卷 673-679页

作者： F. Yan h. W. Zh.ng N.R. Tao k. Lu Sh.nyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

A pure Cu （99.995 wt%） h.s been subjected to dynamic plastic deformation at cryogenic temperature to a strain of 2.1. Th.ee types of microstructures th.t are related to dislocation slip, twinning and sh.ar banding h.ve been quantitatively ch.racterized by transmission electron microscopy （TEM） assisted by convergent beam electron diffraction （CBED） analysis. Microstructures originated from dislocation slip inside or outside th. sh.ar bands are ch.racterized by low angle boundaries （〈15°） th.t are spaced in th. nanometer scale, wh.reas most deformation twins are deviated from th. perfect ∑3 coincidence （60°/〈111〉） up to th. maximum angle of 9°. Th. quantitative structural ch.racteristics are compared with.th.se in conventionally deformed Cu at low strain rates, and allowed a quantitative analysis of th. flow stress-structural parameter relationsh.p.

关键词： Quantitative structural ch.racterization Cu Dynamic plastic deformation Trans mission electron microscopy Convergent beam electron diffraction

Momentum equation for straigh. electrically ch.rged jet

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Applied Math.matics and Mech.nics(English.Edition) 2011年第12期32卷 1515-1524页

作者：张若京 S. h. h.U C. k. Ch.N Sch.ol of Aerospace Engineering and Applied Mech.nics Tongji University Shanghai 200092 P. R. China Department of Applied Math.matics The Hong Kong Polytechnic University Hong Kong P. R. China

A one-dimensional momentum conservation equation for a straigh. jet driven by an electrical field is developed. It is presented in terms of a stress component, wh.ch.can be applied to any constitutive relation of fluids. Th. only assumption is th.t th. fluid is incompressible. Th. results indicate th.t both.th. axial and radial constitutive relations are required to close th. governing equations of th. straigh. ch.rged jet. h.wever, wh.n th. trace of th. extra stress tensor is zero, only th. axial constitutive relation is required. It is also found th.t th. second normal stress difference for th. ch.rged jet is always zero. Th. comparison with.oth.r developed momentum equations is made.

关键词： electrically ch.rged jet stability electrospinning

h.DRODYNAMIC LOADS ON OIL STORAGE TANkS WITh.INTERIOR SEMI-POROUS BARRIERS UNDER EARTh.UAkES

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Journal of h.drodynamics 2001年第1期13卷 1-7页

作者： Miao, G.P. Ish.da, h. Saitoh. T. kurosaki, k. Sch. of Naval Arch.t. and Ocean Eng. Shanghai Jiaotong Univ. Shanghai 200030 China

Th. estimation of th. h.drodynamic loading on cylindrical oil storage tank during earth.uakes is of fundamental importance in th. anti-seismic design. Interior semi-porous barriers are considered being effective to reduce th. h.drodynamic response of th. inner fluid and th. loading on th. tank wall. A reduced two-dimensional source distribution meth.d and sub-region match.ng tech.ique are developed for th. prediction of th.ee-dimensional h.drodynamic forces on oil storage tanks of arbitrary sections with.interior semi-porous barriers of different configurations under earth.uake excitations. Excellent agreement is observed between th. present results and th. corresponding analytical results for a circular cylindrical oil tank with.a concentric interior semi-porous barrier, wh.ch.sh.ws th. validity and effectiveness of th. present meth.d. A clear view of th. influence of semi-porous barriers on th. h.drodynamic response of tanks during earth.uakes is obtained by th. analyses of computational results, wh.ch.may offer some guidance to th. corresponding anti-seismic design for oil storage tanks and similar structures. Th. meth.d is also extended to include th. effects of th. elastic vibrations of th. tank.

关键词： Earth.uake resistance h.drodynamics

Development of an industrial Internet of th.ngs suite for smart factory towards re-industrialization

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Advances in Manufacturing 2017年第4期5卷 335-343页

作者： C. k. M. Lee S. Z. Zh.ng k. k. h. Ng Department of Industrial and Systems Engineering The Hong Kong Polytechnic University Hong Kong People's Republic of China Department of Information Management Zhejiang University of Finance and Economics Hangzhou 310018Zhejiang People's Republic of China

Re-industrialization, wh.ch.supports industrial upgrading and transformation, promotes smart production and h.gh.value-added manufacturing processes, and h.lps to create new momentum for th. economic. Under th. current situation, industrialists encounter several ch.l- lenges to ach.eve re-industrialization. Firstly, th. cost and tech.ical th.esh.lds for industrialists to leverage emerging tech.ologies are h.gh. Secondly, th.re are h.ge quantities and numerous types of Internet of th.ngs （IoT） devices in smart factories, wareh.uses and offices. Th. enormous extents of data exch.nge and communication, manage- ment, monitoring and control of IoT devices as well as th. establish.ent and maintenance of a reliable cloud platform h.nder industrialists to implement an integrated smart production management. Th.refore, to ach.eve re-indus- trialization, an industrial Internet of th.ngs （IIoT） suite consisting of a micro-services-based IIoT cloud platform and IIoT-based smart h.b is proposed, wh.ch.h.lps to materialize re-industrialization and to conduct industrial upgrading and transformation to ach.eve smart production and h.gh.value-added manufacturing processes.

关键词： Industrial Intemet of th.ngs (IIoTs) Cloudplatform Micro-services-based Industry 4.0 Reindustrialization

Regional-Scale Study on Sediment Processes of kh.ran Strait at Persian Gulf with.Implications for Engineering Design

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Ch.na Ocean Engineering 2019年第3期33卷 356-364页

作者： A. Sh.neh.azzadeh.h. Ardalan Faculty of Civil Engineering and Transportation University of Isfahan Isfahan Iran Water Research.Institute (WRI) Tehran Iran

In th.s article, th. sediment transport processes in th. kh.ran Strait between th. mainland Iran and Qesh. Island at North.Central Persian Gulf are studied in regional scale in a compreh.nsive manner. Th. objectives of th.s study include defining th. type and origin of th. sediment, th. influencing factors, and th. dominant mode of sediment transport. Four possible scenarios of sediment processes in terms of sediment sources and influential environmental forces are examined. Th. results of th. conceptual and 2D numerical model of MIkE21 applied for th.s purposes indicate th.t th. sediment sources in th. transport processes are mainly provided by th. sediments suspended from th. central and eastern zones of th. strait bed. Oth.r sources including input from rivers do not h.ve direct influence on th. processes. Th. results are applied to th. study of morph.logical ch.nges for engineering applications including th. pattern and amount of deposit in th. Rajaee port approach.ch.nnel and h.rbor basin. Th. pattern and amount of annual sediment deposits in th. approach.ch.nnel predicted by th. model is satisfactory, compatible with.annual dredging records.

关键词： sediment transport morph.dynamics 2D numerical model Persian Gulf kh.ran Strait Rajaee Port

On h.wking Radiation of 3D Rotating h.iry Black h.les

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Ch.nese Ph.sics Letters 2015年第10期32卷 14-16页

作者： Belh.j A Ch.bab M El Moumni h. Masmar k. SedraM. B. Departement de Ph.sique Faculte Polydisciplinaire Universite Sultan Moulay Slimane Beni Mellal Morocco h.gh.Energy Ph.sics and Astroph.sics Laboratory FSSM Cadi A yyad University Marrakesh Morocco Ddpartement de Ph.sique LHESIR Faeulte des Sciences Universitd Ibn Tofail Kdnitra Morocco

We study th. h.wking radiation of 3D rotating h.iry black h.les. Specifically, we compute th. transition probability of bosonic and fermionic particles in such.backgrounds. Th.n, we sh.w th.t th. transition probability is independent of th. nature of th. particle. It is observed th.t th. ch.rge of th. scalar h.iry B and th. rotation parameter a control such.a probability.

关键词： exp On h.wking Radiation of 3D Rotating h.iry Black h.les

ANALYTICAL SOLUTIONS FOR Th. SLOSh.NG LOADING ON CIRCULAR CYLINDRICAL LIQUID TANkS WITh.INTERIOR SEMI-POROUS BARRIERS

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Journal of h.drodynamics 2001年第2期13卷 32-39页

作者： Miao, G.P. Ish.da, h. Saitoh. T. kurosaki, k. Sch. of Naval Arch. and Ocean Eng. Shanghai Jiaotong Univ. Shanghai 200030 China

Th. estimation of slosh.ng loading on liquid tanks is of fundamental importance due to th. wide and important applications of liquid tanks in various engineering aspects. Analytical solutions for th. slosh.ng loading on circular cylindrical liquid tanks with.an interior concentric vertical th.n semi-porous barrier under external excitations are presented. And th. extensions of th. solutions to th. elastic vibrations and to th. h.gh.frequency limit to count for th. earth.uake response are also included. A clear view on th. influence of semi-porous barriers to th. slosh.ng response of oscillating tanks is obtained by th. analyses of systematic computational results. Th. present results may offer guidance to th. corresponding design for liquid tanks of various applications and also a basis of comparison for th. development of more soph.sticated numerical meth.ds for h.drodynamic and h.dro-elastic analyses.

关键词： Boundary conditions Math.matical models Tanks (containers) Vibration measurement