简介：联合同轴的共鸣器的现象的模式的研究与理论被进行了。通过建立没有来源的传播线方程，有一个弄皱的内部售票员的同轴的共鸣器的边界条件被分析。最后，计算为Karlsruhe工学院(工具包)的共鸣器在大量折皱参数被执行相关同轴的振动陀螺仪。

简介：Inthisarticletheemphasiswasgiventothediscussionoftheeffectsofdiameterratioandswirlingoninstabilitycharacterforthegas/liquidcoaxialjetusedbyLiao,etal.[1].Theresultsindicatethatthefinitediameterratiomarkedlyincreasesthemaximumgrowthrate,themostunstablewavenumber,aswellasthecutoffwavenumber.Itimpliesthatthefinitediameterratiowillleadtotheliquidjetbreakuplengthshorterandtheliquiddropsizesmaller.Theeffectoftheswirlingjetsismuchmorecomplex:fortheaxisymmetricperturbationmode,theswirlingenhancestheflowstability,forhelicalperturbation,thedominantinstabilitymodeoccursatn<0.Anditisfoundthatinlongwaveregionthereexistsanewkindofinstabilitymodesatn=1thatwasnotmentionedinLiaoetal.'sarticle.Forthisnewmode,thereappearsadominatedswirlingratioatwhichtheflowhasthemaximumgrowthrate.

简介：Inordertounderstandthebreakupperformanceofcoaxialporousinjectors,thespraysofcoaxialporousinjectorswithtwodifferentporousmaterialcylinderlengthswerecomparedwiththoseofconventionalshearcoaxialinjectors.Toallowcomparison,thewallinjectionlengthsweredesignedtobeequivalenttothevalueoftherecessdepth.Coldflowsprayswerevisualizedusingback-litphotographymethodsandanalyzedquantitativelywithalaserdiffractionapparatus,inordertostudytheeffectsofthemomentumfluxratioandWebernumberonthebreakupforeachtypeofinjector.Incaseoftheshearcoaxialinjector,thelargeliquidcorewasobservedinlowairmassflowratecondition.However,thedestabilizationoftheliquidjetfromthecoaxialporousinjectorisalmostcompletewithintheinnerregion,neartheinjectorfaceplate.Additionally,betterbreakupperformanceinlowgasflowrateconditionwasobtainedwhentheporouscylinderlengthdecreased,whiletheshearcoaxialinjectorsshowedbetterbreakupefficiencywhentherecesslengthincreased.Inconclusion,thedifferentbreakupprocesscausedbytheradialmomentumintheinnerregionoftheporousinjectordisintegratedtheliquidcore.

简介：Theinertiasofthefluidandtheinnercylinderincoaxialcylinderrheometer(CACR)havegreatinfluenceontheunsteadyflowofnon-Newtonianfluid.EvenfortheNewtonianfluidthereexistthesocalled'stressovershoot'phenomenon.Inthepresentarticlethisphenomenonwasstudiedindetailandamethodcorrectingthemeasuredresultsforanunsteadyflowintherheometerwasproposed.Itisfoundthattheinertiaeffectofthefluidcanbeignoredwhenthegapbetweencylindersissmall.

简介：Tounveilthecharacteristicsandavailablepropagationmechanismofcoaxial-typemicrowaveexcitedline-shapeplasma,theeffectsofparametersincludingmicrowavepower,workingpressure,dielectricconstant,andexternalmagneticfieldontheplasmadistributionwerenumericallyinvestigatedbysolvingacoupledsystemofMaxwell’sequationsandcontinuityequations.Numericalresultsindicatethathighmicrowavepower,relativelyhighworkingpressure,lowdielectricconstant,andshapedmagneticfieldprofileswillhelpproduceahigh-densityanduniformplasmasource.Excitingbothendsbymicrowavecontributedtothehigh-densityanduniformplasmasourceaswell.Possiblemechanismswereanalyzedbyusingthepolarizationmodeloflowtemperatureplasma.Thegenerationandpropagationprocessesoftheline-shapeplasmamainlydependontheinteractionofthreeaspects,i.e.thetransmittedpart,penetrationpartandabsorptivepartoftheelectromagneticfield.Thenumericalresultswerequalitativelyconsistentwithavailableexperimentalresultsfromliterature.Moreelaboratedescriptionsofthethreeaspectsandcorrespondinginteractionsamongthemneedtobeinvestigatedfurthertoimprovethepropertiesoftheline-shapeplasma.

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简介：Polystyrene(PS)fiberswithcore-shellstructureswerefabricatedbycoaxialelectrostaticspinning,[10_TD$IF]inwhichthereareliquidepoxyorcuringagentasthecoreandPSastheshell.Scanningelectronmicroscopy(SEM),Fouriertransforminfrared(FTIR)spectraandopticalmicroscopewereutilizedforcharacteringthemorphologyandcompositionofthefibers.Compositecoatingsembeddedwiththehealant-loadedcoreshellfibershavebeenpreparedandtheself-healingofthescratchonthecoatingshasbeenrevealed.

简介：Thispaperpresentsdetailedtheoreticalstudyonthetheoryofwavepropagationalongthecoaxialwaveguidefilledwithmovingmagnetizedplasma(CWMMP).MakinguseoftheLorentztransformationandtheconstitutivetransformation,Maxwell'sequationsleadtothecouplednon-homogeneousdifferentialequationswhichgovernthewavepropagationinCWMMP,andthenanalyticalsolutionshavebeenobtained.Thediscussionabouttheeigenvaluesofthewavesanddetailedstudiesonthefieldsarecarriedout.ItfindsthatthefieldsoftheCWMMParecomposedoftwopartswithdifferenteigenvalues.NumericalcalculationsshowthatbecauseofDopplershifteffect,theeigenvaluesofthemodesinsuchacaseisquitedifferentfromthoseoftheCWMMP.AndadetaileddiscussiononthedispersioncharacteristicofCWMMPispresented.

简介：AnexperimentalsetupofacquiringthecoaxialvisualimageofthemoltenpoolandkeyholeinhighpowerNd:YAGlaserweldingisintroducedinthispaper.Itisoneofthemostdifficultproblemsinacquiringcoaxialimagethatthecoaxialimagingsignalofmoltenpoolandkeyholemustbeseparatedfromthelaserbeamwithhighpower.Thisproblemwasresolvedbydesigningadichroiticspectroscope.Thecharacteristicsofimagingsignalwereanalyzedandthecoaxialimageofmoltenpoolandkeyholewasacquired.Asmoothingfilterandahomomorphicfilterweredesignedtoremovethelowfrequencynoiseandtoenhancetheimageaccordingtothecharacteristicsofimagingsignal.Atlast,edgesofmoltenpoolandkeyholeweredetectedandextractedbasedonimagesegmentationwiththreshold.

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简介：Acoaxialinsulated-rod-to-cylinderunderwaterstreamerdischargesystemcapableofinjectingplasmaintoalargevolumeofwaterwasdevelopedandemployedtodecolorizeazodyesunsetyellow.Therodtypeanodewascoveredbyaninsulatortubewithawallthicknessof0.4mm.Aseriesofslitswithawidthof20μmto80μmandalengthofabout4mmwerecutontothewalloftheinsulatortube.Dependingonthesolutionconductivity,acylindricaldischargeregionwithalengthof60mmandawallthicknessof5mmto11mmformsinthereactor.Theinfluenceofthesolutionconductivity,pHandpulsefrequencyonthedecolorationofsunsetyellowwasinvestigated.Theresultsshowthatthesolutionconductivityhaslittleeffect,whilethesolutionpHandthepulsefrequencyhavesignificantinfluenceonthedecolorationrateofsunsetyellow.Thedecolorationrateofsunsetyellowisincreasedwiththeincreaseinpulsefrequency.AlowerpHinsolutionpromotesthedecolorationofsunsetyellowwhileahigherpHinhibitsit.

简介：Anewlydevelopedcoaxialdielectricbarrierdischargereactorwithalengthof1000mmatanatmosphericpressurewasusedforplasmatreatmentofpolyesterfibercordinaroll-to-rollmanner.Inthisreactor,swirlingmixturegasesofoxygenofabout1%andargonwithaflowrateof1.5L/minto2.7L/minensuredthegasusagesparing,dischargeuniformityandefficientfibersurfacemodification.Thewatercontactangleandsurfacemorphologyofthetreatedfiberweremeasured.Theresultsshowthatthesurfaceoxygenationismainlyresponsibleforthewettabilityimprovementofthefibercordwhenpassingthroughtheplasmazoneatalinearspeedof3m/minto8m/min.Thespecimensofmodified-polyesterfiberreinforcedrubbercompositewerealsopreparedfortheinterfacialshearstrengthtests.Furthermore,theeffectofaddingoxygenintoargondischargeonthefibersurfaceoxidationwascorrelatedwithopticalemissionspectroscopy.Finally,theeffectofaddingoxygenintoargondischargeonthekineticprocessesoftheactivespeciesgenerationwerealsoanalyzed.

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