简介:Afleaandaflyflewupinaflue.Saidtheflea,“Letusfly!”Saidthefly,“Letusflee!”Sotheyflewthroughaflawintheflue.一只跳蚤和一只苍蝇在排烟管里往上飞。跳蚤说,“我们飞!”苍蝇说,“我们逃!”它们就从排烟管的裂缝飞出去了。
简介:Experimentswereconductedtoinvestigatetheeffectofimpellergeometryandtongueshapeontheflowfieldofcrossflowfans.Threeimpellers(Ⅰ,Ⅱ,Ⅲ)havingsameouterdiameter,butdifferentradiusratioandbladeangleswereemployedfortheinvestigation.Eachimpellerwastestedwithtwotongueshapes.Flowsurveywascarriedoutforeachimpellerandtongueshapeattwoflowcoefficients.andforeachflowcoefficientatdifferentcircumferentialpositions.Theflowistwo-dimensionalalongthebladespanexceptneartheshrouds.Thetotalpressuredevelopedbytheimpellersineachcaseisfoundtobemaximumatacircumferentialpositionofaround270°.Thetotalandstaticpressuresattheinletofimpellersaremoreorlesssameregardlessofimpellerandtonguegeometry,buttheyvaryconsiderablyatexitoftheimpellers.ImpellerⅢwithtongueT2developshighertotalpressureandefficiencywhereasimpellerⅡwithtongueT2developsminimumtotalpressure.HigherdiffusionandsmallervortexsizearethereasonsforbetterperformanceofimpellerⅢwithtongueT2。
简介:Inthispaper,weproposeanovelautomaticobjectextractionalgorithm,namedtheTemplateGuidedLiveWire,basedonthepopularlyusedlivewiretechniques.Wediscussindetailsthenovelmethod'sapplicationsontongueextractionindigitalimages.Withtheguidesofagiventemplatecurvewhichapproximatesthetongue'sshape,ourmethodcanfinishtheextractionoftonguewithoutanyhumanintervention.Inthepaper,wealsodiscussedindetailshowthetemplateguidesthelivewire,andwhyourmethodfunctionsmoreeffectivelythanotherboundarybasedsegmentationmethodsespeciallythesnakealgorithm.Experimentalresultsonsometongueimagesareaswellprovidedtoshowourmethod'sbetteraccuracyandrobustnessthanthesnakealgorithm.