简介：Aprocessfornumericalanalysisofradialcirculationdistributionofpropellerbladeisproposedandpresented.Itisbasedontheresultsofnumericalsimulationofthevelocityfieldaroundpropellerbladesandinthewake.Thewell-knowntraditionalmethodusingtangentialvelocitydatainthewakeandapplyingStockes'stheoremwasalsoexaminedintheinvestigation.Theresultsfromtwoapproachesarecomparedwitheachother.Itisfoundthatifthetraditionalwayisutilized,inmanycasesanunexpected'hump'appearsinthecirculationdistributionatcertainouterradius.Theauthorscalculatedthecirculationsdirectlyaroundbladesections,anditisreferredasdirectmethod.Theunexpectedhumpofthecirculationdistributiondisappearsintheresultsofdirectmethod.Thisarticlealsodiscussesthereasonsoftheappearanceoftheunexpectedhumpintraditionalapproach.Thedirectmethodisproposedtohaveapotentialinanalyzingorverifyingtheradialroaddistributionfordesignedpropellerandthenumericalanalysisinsteadofexperimentalvalidationforcirculationdistributioncanbeasatoolinthepropellerdesignprocess.

简介：Thedynamicsindexes,playinganimportantroleinthecerebralcirculation,willbechangedsignificantlycomparedwiththeirnormalrangeinmanycerebrovasculardisease.ThegeometricalparametersofcerebrovascularmaybedetectedbyDSAorMRAscan,butthehemodynamicparameters,suchas,bloodflow,arteryresistanceandcompliancemustbecalculatedbybuildinghemodynamicsmodel.Thecerebralcircularsystemthathasfourentrancesforbloodflow(twocarotidandtwovertebralarteries)andthreecommunicatingarteriesismuchdifferentfromthesystematicststemwhichhasonlyoneentrance,ic.,theaortic.Thepurposeofthisstudyistosetupahemodynamicsmodelwithlumpedparameterstodescribethecerebralcirculation.Fromthismodel,wegetitsgoverningequationsandpresentanewmethodtocalculatethehemodynamicsindexesinclinicalapplication.

简介：AseveretyphoonUtor,occurringbetweenJuly3and8,2001,broughtheavyrainfall,strongwindandstormsurge.UtorwasresponsiblefortremendousdestructionandeconomiclossesinPhilippines,TaiwanandGuangdong.Anair-seamodelsystem(MM5andPrincetonOceanModel(POM))wasbuilttosimulatemeteorologicaldynamicsandoceancirculationintheSouthChinaSea(SCS).InthePOMtheoutputofMM5wasusedastheinputdata.Withanincreasednumberofverticallevels,ahigh-resolutionplanetaryboundarylayerschemeandupdatedlanduse/vegetationdata,theaccuracyofcomputingwind,temperatureandothermeteorologicalfieldsareimprovedinnearsurfaceandupperlevelsinMM5simulations.ThesimulatedtrajectoryandwindspeedofUtorareclosetotheobservedresults.ThesimulateddistributionofrainfallisaccordedwellwithmeasureddatainthePearlRiverDelta(PRD)area.AtdifferentmeteorologicalstationsinHongKong,thewind,temperatureandseasurfacepressurearewellsimulated.Thesimulatedoceansurfacecurrentandsurfacetemperaturefieldshaveanobviousrightward-biasedresponsetothetyphoonUtor,andthemaximumvelocityandthelowesttemperatureregionappearinthe30kmoftherightsideofthetyphoontrack.ThetyphoonUtorcouldmakethewater50munderthesurfaceoceanunwelltosurfaceandtheoceansurfacetemperaturedecreasebyabout2°C.

简介：Theaimofthisexperimentalstudyistoinvestigatetheeffectsofhydraulicparametersontheformationofair-entrainingvorticesathorizontalintakestructureswithoutapproachflowinducedcirculation.Sixintakepipesofdifferentdiametersweretestedinthestudy.Theintakepipetobetestedwashorizontallymountedtothefrontsideofalargereservoirandthenforawiderangeofdischargesexperimentswereconductedandcriticalsubmergencesweredetectedwithadjustableapproachchannelsidewalls.Empiricalequationswerederivedforthedimensionlesscriticalsubmergenceasafunctionoftherelevantdimensionlessparameters.Availabledataisalsocheckedforthepossiblescaleeffect.Then,theseobtainedequationswerecomparedwiththesimilaronesintheliteraturewhichshowedaquitegoodagreement.