简介:he will have regrets about having never gone back and traveling down the roads he did not take. Yet he remains proud of his decision and he recognizes that it was this path that he chose that made him turn out the way and he did and live his life the way in which he lived. "I took the road less trvaelled by and that had made all the difference." To this man,and having perhaps the better claim." What made it have the better claim is that "it was grassy and wanted wear." It was something that was obviously not for everyone because it seemed that the majority of people took the other path therefore he calls it "the road less travelled by". The fact that the traveler took this path over the more popular,"And sorry I could not travel both..." It is always difficult to make a decision because it is impossible not to wonder about the opportunity cost
简介:he will have regrets about having never gone back and traveling down the roads he did not take. Yet he remains proud of his decision and he recognizes that it was this path that he chose that made him turn out the way and he did and live his life the way in which he lived. "I took the road less trvaelled by and that had made all the difference." To this man,and having perhaps the better claim." What made it have the better claim is that "it was grassy and wanted wear." It was something that was obviously not for everyone because it seemed that the majority of people took the other path therefore he calls it "the road less travelled by". The fact that the traveler took this path over the more popular,"And sorry I could not travel both..." It is always difficult to make a decision because it is impossible not to wonder about the opportunity cost
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:摘要运用Heath-Carter人体测量体型方法对广西贺州壮族成年人532例(男为267例,女为265例)进行了体型评定。结果表明⑴贺州壮族成人男女的平均体型值分别为2.7-4.9-2.9和4.7-4.4-2.2,分别属均衡的中胚层体型和内胚层-中胚层均衡体型。⑵男性的内因子值在25岁后、30岁后这两个年龄段增长较快,其余年龄组变化不大,中因子值随着年龄的增加而缓慢增高,而在55岁后年龄段则稍下降,外因子值在20岁后、55岁后年龄段处于较高水平,其他年龄组变化不大;女性内因子值随年龄的增加缓慢增高,50岁后下降明显,中因子除20岁后较低外,25岁以后变化不大,外因子在20岁后年龄段较高,而随着年龄的增长则出现逐渐下降情况,而在50岁后、55岁后又明显增大。⑶贺州壮族成人男女间的体型有显著的性差异(P<0.01)。⑷与国内外资料相比,贺州壮族体型与广西仫佬族、贵州布依族最为接近。