简介:Self-similarsteadynaturalconvectionthermalboundarylayerflowfromarotatingverticalconetoanisotropicDarcianporousmediumisinvestigatedtheoreticallyandnumerically.Thetransformednon-dimensionaltwo-pointboundaryvalueproblemisreducedtoasystemofcoupled,highlynonlinearordinarydifferentialequations,whicharesolvedsubjecttorobustsurfaceandfreestreamboundaryconditionswiththeMAPLE17numericalquadraturesoftware.Validationwithearliernon-rotatingstudiesisincluded,andalsofurtherverificationofrotatingsolutionsisachievedwithavariationalfiniteelementmethod(FEM).Therotational(spin)parameteremergesasaninversefunctionoftheGrashofnumber.Theinfluenceofthisparameter,primaryDarcynumber,secondaryDarcynumberandPrandtlnumberontangentialvelocityandswirlvelocity,temperatureandheattransferratearestudiedindetail.ItisfoundthatthedimensionlesstangentialvelocityincreaseswhilstthedimensionlessswirlvelocityandtemperaturedecreasewiththeswirlDarcynumber,tangentialDarcynumberandtherotationalparameters.Themodelfindsapplicationsinchemicalengineeringfiltrationprocessing,liquidcoatingandspinningconedistillationcolumns.
简介:WiththeeconomicdevelopmentandtheaccelerationofmotorizationinChina,thenumberofprivatecarsincreasesrapidlyinurbanareas.However,thelimitofurbanresourcesandthecontradictionbetweentrafficsupplyanddemandareincreasinglyprominentinlargecities,whileprivatecarconsumptionhasbeenanew'light'inmediumandsmallcities.Consumers’behaviorsdifferfromregiontoregion.Aimingattheaboveproblems,weformulatestructuralequationmodelingandcarryoutempiricalresearch.Inthispaper,acomparativestudyaboutthemaininfluentialfactorsthataffecttheconsumptionofprivatecarsinlargeandsmallcitiesinChinaismade,anditishopedthatsomeguidanceforpolicyrecommendationscanbeobtained.
简介:Ⅰ.AnalysisofFactorsAffectingIntellectualPropertyPledgeFinancingSincetechnologyisamajordrivingforceforeconomicrevitalization,eachcountryattachesgreatimportancetotheadjustmentofindustrialstructure,highlightsthedevelopmentofhigh-technologyenterprises,andpursuestheroadofinnovationanddevelopment.