简介:Theweaknonlinearmodulationofthesurfacewaveofathree-dimensionalimcompressiblefluidwithoutrotation,whichiscontainedinarectangulartroughisstudiedbyusingthemethodofmulti-plescalesperturbationtheory.Theeffectsofviscidandexternaldriveonthemotion,whichmodifiestheLarraza-Puttermanequation,areconsidered.TheresultsareconsistentwiththatofMiles.
简介:TheablativeRichtmyer–Meshkovinstability(ARMI)iscrucialtothesuccessfulignitionimplosionoftheinertialconfinementfusion(ICF)becauseofitsactionastheseedoftheRayleigh–Taylorinstability.InusualICFimplosions,thefirstshockdrivenbyvariousfootsofthepulsesplaysacentralroleintheARMIgrowth.WeproposeanewschemeforrefrainingfromARMIwithapulseofsuccessivepickets.Withthesuccessive-picketpulsedesign,arippledcapsulesurfaceiscompressedbythreesuccessiveshockswithsequentiallystrengtheningintensitiesandablatedstabilization,andtheablativeRichtmyer–Meshkovgrowthismitigatedquiteeffectively.Ournumericalsimulationsandtheoreticalanalysesidentifythevalidityofthisscheme.
简介:Ofthe17rareearthelements(REEs),somehaveprovenrarerthanothers.Neodymiumandpraseodymium(NdPr),twometalsinstrumentaltotherapidlyexpandinggreenenergyandelectricvehicle(EV)sectors,sawthegreatestdemandandpricemovementin2018.Demandforthemetals,whichareusedtomakehigh-strengthmagnetsforwindturbinesandEVengines,isexpectedtogrowasmoreEVsaremanufacturedandasclean-energystrategiesareadopted.
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