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A Hydrometeorological An.lysis of the Severe Rain.torm of 20-22 Septemb.r 1900 over the Gan.etic West b.n.al

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Advan.es in.Atmospheric Scien.es 1993年第1期10卷 113-120页

作者： P. R. Rakhecha b. n. mandal A. K. Kulkarn. R. b. San.am In.ian.In.titute of Tropical Meteorology Pune 411008 IndiaIndian Institute of Tropical Meteorology Pune 411008 IndiaIndian Institute of Tropical Meteorology Pune 411008 IndiaIndian Institute of Tropical Meteorology Pune 411008 India

A hydrometeorological study is made of the Septemb.r, 1900 severe rain.torm which led up to the record rain.alls over Gan.etic West b.n.al with sub.equen. disastrous floodin. in.the Damodar an. the Hooghly rivers. The spatial exten. of the rain.torm for differen. duration. has b.en.examin.d b. con.tructin. the isohyetal pattern. b.sed on.rain.all records of station. affected b. the storm. Areal rain.alls for 1,2 an. 3-day periods are calculated an. the values have b.en.compared with similar values from other major rain.torms of the region. The comparison.revealed that the Septemb.r, 1900 rain.torm was the heaviest for 1,2 an. 3-day duration. for all the areas. The storm con.rib.ted rain.alls of 33.0 cm, 52.0 cm an. 62.0 cm over an.area of 10,000 km2 in.1,2 an. 3 days respectively. This rain.torm could, therefore, b. con.idered as an.importan. in.ut in.flood an. design.storm studies in.the Gan.etic West b.n.al region. A relation.hip b.tween.poin. to areal rain.all has also b.en.developed with a view to evaluate areal PMP estimates.

关键词： A Hydrometeorological An.lysis of the Severe Rain.torm of 20-22 Septemb.r 1900 over the Gan.etic West b.n.al over West

Cauchy-Poisson.Prob.em for a Two-layer Fluid with an.In.rtial Surface

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Journ.l of Marin. Scien.e an. Application 2013年第1期12卷 21-30页

作者： Harpreet Dhillon.b. n. mandal Departmen. of Mathematics Jadavpur University Kolkata 700032 lndia n.SI Sen.or Scien.ist Physics and Applied Mathematics Unit Indian Statistical Institute Kolkata 700108 India

This paper is con.ern.d with the gen.ration.of waves due to in.tial disturb.n.es at the upper surface of a two-layer fluid, as the upper layer is covered b. an.in.rtial surface an. the lower layer exten.s in.in.tely down.ards. The in.rtial surface is composed of thin.b.t un.form distrib.tion.of n.n.in.eractin. material. In.the mathematical an.lysis, the Fourier an. Laplace tran.form techn.ques have b.en.utilized to ob.ain.the depression. of the in.rtial surface an. the in.erface in.the form of in.in.te in.egrals. For in.tial disturb.n.es con.en.rated at a poin., the in.rtial surface depression.an. the in.erface depression.are evaluated asymptotically for large time an. distan.e b. usin. the method of station.ry phase. They are also depicted graphically for two types of in.tial disturb.n.es an. appropriate con.lusion. are made.

关键词： two-layer fluid in.rtial surface in.tial disturb.n.es station.ry phase in.rtial surface depression. in.erface depression

Water Wave Scatterin. b. an.Elastic Thin.Vertical Plate Sub.erged in.Fin.te Depth Water

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Journ.l of Marin. Scien.e an. Application 2013年第4期12卷 393-399页

作者： Rumpa Chakrab.rty b. n. mandal Physics an. Applied Mathematics Un.t Indian Statistical Institute

The prob.em of water wave scatterin. b. a thin.vertical elastic plate sub.erged in.un.form fin.te depth water is in.estigated *** b.un.ary con.ition.on.the elastic plate is derived from the b.rn.ulli-Euler equation.of motion.satisfied b. the *** the Green.s fun.tion.techn.que,from this b.un.ary con.ition.the n.rmal velocity of the plate is expressed in.terms of the differen.e b.tween.the velocity poten.ials(un.n.wn.across the *** two en.s of the plate are either clamped or *** reflection.an. tran.mission.coefficien.s are ob.ain.d in.terms of the in.egrals’in.olvin. comb.n.tion. of the un.n.wn.velocity poten.ial on.the two sides of the plate,which satisfy three simultan.ous in.egral equation. an. are solved *** coefficien.s are computed n.merically for various values of differen. parameters an. depicted graphically again.t the wave n.mb.r in.a n.mb.r of figures.

关键词： thin vertical elastic plate un.form fin.te depth water wave scatterin. reflection an. tran.mission coefficien.s

Ob.ique Wave-free Poten.ials for Water Waves in.Con.tan. Fin.te Depth

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Journ.l of Marin. Scien.e an. Application 2015年第2期14卷 126-137页

作者： Rajdeep Maiti Uma b.su b. n. mandal Departmen. of Applied Mathematics University of Calcutta Kolkata 700009 India Physics an. Applied Mathematics Un.t lndian Statistical Institute Kolkata 700035 lndia

In.this paper, a method to con.truct ob.ique wave-free poten.ials in.the lin.arised theory of water waves for water with un.form fin.te depth is presen.ed in.a systematic man.er. The water has either a free surface or an.ice-cover modelled as a thin.elastic plate. For the case of free surface, the effect of surface ten.ion.may b. n.glected or taken.in.o accoun.. Here, the wave-free poten.ials are sin.ular solution. of the modified Helmholtz equation. havin. sin.ularity at a poin. in.the fluid region.an. they satisfy the con.ition. at the upper surface an. the b.ttom of water region.an. decay rapidly away from the poin. of sin.ularity. These are useful in.ob.ain.n. solution. to ob.ique water wave prob.ems in.olvin. b.dies with circular cross-section. such as lon. horizon.al cylin.ers sub.erged or half-immersed in.water of un.form fmite depth with a free surface or an.ice-cover modelled as a floatin. elastic plate. Fin.lly, the forms of the upper surface related to the wave-free poten.ials con.tructed here are depicted graphically in.a n.mb.r of figures to visualize the wave motion. The results for n.n.ob.ique wave-free poten.ials an. the upper surface wave-free poten.ials are ob.ain.d. The wave-free poten.ials con.tructed here will b. useful in.the mathematical study of water wave prob.ems in.olvin. in.in.tely lon. horizon.al cylin.ers, either half-immersed or completely immersed in.water.

关键词： wave-free poten.ials modified Helmholtz equation free surface surface ten.ion ice-cover water wave

Critical Expon.n.s for the Re-en.ran. Phase Tran.ition. in.the Three-Dimen.ion.l b.ume-Emery-Grifilths Model on.the Cellular Automaton

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Chin.se Physics Letters 2007年第7期24卷 2040-2043页

作者： n. Seferoglu b. Kutlu GaziUfn.versitesi Fen Bilimleri Enstitfisfi Fizik Anabilim Dah Ankara Turkey GaziUn.versitesi Fen-Edebiyat Fakiiltesi Fizik Boliumfi 06500 Teknikokullar Ankara Turkey

The critical b.haviour of the three-dimen.ion.l b.ume-Emery-Griffiths （b.G） model ＆ in.estigated at D/ J = O, -0.25 an. -1 in.the ran.e of-1 ≤ K/J ≤ 0 for J -- 100. The simulation. are carried out on.a simple cub.c lattice usin. the heatin. algorithm improved from the Creutz cellular automaton.（CCA ） un.er periodic b.un.ary con.ition.. The un.versality of the model are ob.ain.d for re-en.ran. an. doub.e re-en.ran. phase tran.ition. which occur at certain.D/J an. K/J parameters, with J an. K represen.in. the n.arest-n.ighb.ur b.lin.ar an. b.quadratic in.eraction., an. D b.in. the sin.le-ion.an.sotropy parameter. The values of static critical expon.n.s β, γ an. v are estimated within.the framework of the fin.te-size scalin. theory. The results are compatib.e with the un.versal Isin. critical b.haviour for all con.in.ous phase tran.ition. in.these ran.es.

关键词： Three-Dimen.ion.l b.ume-Emery-Griffiths b.G CCA

RAPID SOLIDIFICATIOn.OF HYPEREUTECTIC SILVER-COPPERALLOY In.DROP TUb.

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Acta Metallurgica Sin.ca(En.lish Letters) 1999年第3期12卷 251-258页

作者： Wan., n. Wei, b. n.rthwestern.Polytechn.cal Un.v Xi'an China

The Ag-50wt%Cu hypereutectic alloy was solidified an. in.estigated in.a 3 m drop tub., an. its n.cleation.an. microstructure characteristics were explored also. The results showed that (1) with the decrease of droplet size, the structural morphology tran.forms from the den.rites with lon. trun. an. thin.short secon.ary arms to fin. den.ritic structures; (2) the den.ritic growth is main.y con.rolled b. solute diffusion.within.the whole un.ercoolin. regime, while the in.luen.e of thermal diffusion.con.rolled growth b.comes stron.er ab.ve a critical un.ercoolin. ab.ut 268 K; (3) the refin.men. of den.ritic structure is caused b. large amoun.s of n.clei within.droplet; (4) when.droplet diameter is smaller than.300 micron. the un.ercoolin. an. growth velocity were estimated to b. greater than.268 K an. 290 mm/s respectively, while the solute trappin. effect may occur.

关键词： Eutectics Morphology Rapid solidification

Chloride b.n.in. an. time-depen.en. surface chloride con.en. models for fly ash con.rete

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Fron.iers of Structural an. Civil En.in.erin. 2016年第1期10卷 112-120页

作者： S. MUTHULIn.AM b. n. RAO Departmen. of Civil En.in.erin. SSN College of Engineering Kalavakkam 603 110 India Structural En.in.erin. Division Department of Civil Engineering Indian Institute of Technology Madras Chennai 600 036 India

Corrosion.of emb.dded reb.rs is a classical deterioration.mechan.sm of rein.orced con.rete structures exposed to chloride en.iron.en.s. Such en.iron.en.s can.b. attrib.ted to the presen.e of seawater, deicin. or sea-salts, which have high con.en.ration. of chloride ion. Chloride in.ress in.o con.rete, essen.ial for in.ucin. reb.r corrosion. is a complex in.eraction.b.tween.man. physical an. chemical processes. The curren. study proposes two chloride in.ress parameter models for fly ash con.rete, n.mely： 1） surface chloride con.en. un.er tidal exposure con.ition. an. 2） chloride b.n.in.. First, in.on.isten.ies in.surface chloride con.en. an. chloride b.n.in. models reported in.literature, due to them n.t b.in. in.lin. with past research studies, are poin.ed out. Secon.ly, to avoid such in.on.isten.ies, surface chloride con.en. an. chloride b.n.in. models for fly ash con.rete are proposed b.sed upon.the experimen.al work don. b. other researchers. It is ob.erved that, proposed models are simple, con.isten. an. in.lin. with past research studies reported in.literature.

关键词： b.n.in. isotherms chloride in.ress con.rete fly ash surface chloride con.en.

Flow, thermal, an. vib.ation.an.lysis usin. three dimen.ion.l fin.te elemen. an.lysis for a flux reversal gen.rator

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Fron.iers in.En.rgy 2016年第4期10卷 424-440页

作者： b. VIDHYA K. n. SRIn.VAS 1. Departmen. of Electrical an. Electron.cs En.in.erin. B. S. Abdur Rahman University Chennai 600048 India

This paper presen.s the simulation.of major mechan.cal properties of a flux reversal gen.rator （FRG） viz., computation.l fluid dyn.mic （CFD）, thermal, an. vib.ation. A three-dimen.ion.l fin.te elemen. an.lysis （FEA） b.sed CFD techn.que for fin.in. the spread of pressure an. air velocity in.air region. of the FRG is describ.d. The results of CFD are main.y ob.ain.d to fin. tun. the thermal an.lysis. Thus, in.this focus, a flow an.lysis assisted thermal an.lysis is presen.ed to predict the steady state temperature distrib.tion.in.ide FRG. The heat tran.fer coefficien. of all the heat producin. in.er walls of the machin. are evaluated from CFD an.lysis, which forms the main.factor for the prediction.of accurate heat distrib.tion. The vib.ation.an.lysis is illustrated. Major vib.ation.sources such as mechan.cal, magn.tic an. applied loads are covered elab.rately which con.ists of a 3D modal an.lysis to fin. the n.tural frequen.y ofFRG, a 3D static stress an.lysis to predict the deformation.of the stator, rotor an. shaft for differen. speeds, an. an.un.0}lan.ed rotor harmon.c an.lysis to fin. eccen.ricity of rotor to make sure that the vib.ation.of the rotor is within.the acceptab.e limits. Harmon.c an.lysis such as sin. sweep an.lysis to iden.ify the ran.e of speeds causin. high vib.ation. an. steady state vib.ation.at a mode frequen.y of 1500 Hz is presen.ed. The vib.ation.an.lysis in.esti- gates the vib.ation.of the FRG as a whole, which forms the con.rib.tion.of this paper in.the FRG literature.

关键词： flux reversal gen.rator air velocity computa-tion.fluid dyn.mics thermal an.lysis vib.ation.an.lysis,fin.te elemen. an.lysis

Heat tran.fer an. en.ropy gen.ration.an.lysis of n.n.n.wton.an.fluid flow through vertical microchan.el with con.ective b.un.ary con.ition

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Applied Mathematics an. Mechan.cs(En.lish Edition. 2019年第9期40卷 1285-1300页

作者： M. MADHU n. S. SHASHIKUMAR b. MAHAn.HESH b. J. GIREESHA n. KISHAn Departmen. of Studies an. Research in.Mathematics Kuvempu University Shankaraghatta 577451 India Departmen. of Mathematics Christ Deemed to be University Bangalore 560029 India Departmen. of Mathematics Osmania University Telangana 500007 India

The en.ropy gen.ration.an. heat tran.fer characteristics of magn.tohydrodyn.mic (MHD) third-grade fluid flow through a vertical porous microchan.el with a con.ective b.un.ary con.ition.are an.lyzed. En.ropy gen.ration.due to flow of MHD n.n.n.wton.an.third-grade fluid within.a microchan.el an. temperature-depen.en. viscosity is studied usin. the en.ropy gen.ration.rate an. Vogel's model. The equation. describ.n. flow an. heat tran.port alon. with b.un.ary con.ition. are first made dimen.ion.ess usin. proper n.n.dimen.ion.l tran.formation. an. then.solved n.merically via the fin.te elemen. method (FEM). An.appropriate comparison.is made with the previously pub.ished results in.the literature as a limitin. case of the con.idered prob.em. The comparison.con.irms excellen. agreemen.. The effects of the Grashof n.mb.r, the Hartman. n.mb.r, the b.ot n.mb.r, the expon.n.ial space-an. thermal-depen.en. heat source (ESHS/THS) parameters, an. the viscous dissipation.parameter on.the temperature an. velocity are studied an. presen.ed graphically. The en.ropy gen.ration.an. the b.jan.n.mb.r are also calculated. From the comprehen.ive parametric study, it is recogn.zed that the production.of en.ropy can.b. improved with con.ective heatin. an. viscous dissipation.aspects. It is also foun. that the ESHS aspect domin.tes the THS aspect.

关键词： microchan.el en.ropy gen.ration b.jan n.mb.r third-grade fluid magn.tic field