简介:Inthispaper,thewaves’breakingintheleewavesissuccessfullysimulatedbytheatmosphericmesoscalenumericalmodelwithasecond-ordertur-bulentclosure.Itisfurtherprovedthattheturbulenceinthewave-breakingregionplaystheroleofintensemixingfortheaveragefield,whichleadstothetrappingofupwardpropagatingwavesandthuspromotesthedevelopmentofthedownslopewind.Theturbulentstructureinthewave-breakingregionisdiscussedandthefol-lowingconclusionsareobtained:(1)Inthewave-breakingregion,theturbulentheatfluxestransferfrominsidetooutsideandtheturbulentmomentumfluxestransferfromoutsidetoinside.(2)Inthewave-breakingregion,theturbulentenergymainlycomesfromthewindshearandthebuoyancypromotestheturbulentdevelopmentonlyinpartoftheregion.(3)Intheupperpartofthewave-breakingregion,theturbulentmomentumfluxesbehaveasacounter-gradienttransfer.(4)Theturbulentmixinginthewave-breakingregionisnon-local.
简介:Friedberg,LeeandZhao(FLZ)proposedamethodforeffectivelyevaluatingtheeigenenergiesandeigenwavefunctionsofquantumsystems.Inthiswork,westudyseveralspecialcasestoinvestigateapplicabilityofthemethod.Concretely,wecalculatetheground-stateeigenenergyoftheHellmannpotentialaswellastheCornellpotential,andalsoevaluatetheenergiesofthesystemswherelineartermisaddedtotheCoulombasaperturbation.Theresultsobtainedinthismethodhaveasurprisingagreementwiththetraditionalmethodorthenumericalresults.Sincetheresultsinthismethodhaveobviousanalyticitycomparedtothatinothermethods,andbecauseofthesimplicityforcalculationsthismethodcanbeappliedtosolvingtheSchrodingerequationandprovidesusabetterunderstandingofthephysicalessenceoftheconcernedsystems.ButmeanwhileapplicationsoftheFLZmethodarerestrictedatpresent,especiallyforcertainpotentialforms,butduetoitsobviousadvantages,itshouldbefurtherdeveloped.
简介:由于保险公司经营规模的不断扩大,险种类型的增多,用古典风险模型及其其它推广的单一险种风险模型来研究其风险经营过程存在着局限性,因而需要建立多险种的风险模型。本文研究了一类两种险种且理赔次数服从Cox过程的模型。得到了破产概率满足推广的Lundberg不等式。以及在特殊情况时ψ(0)的明确表达式。