简介：

简介：Thetransitionbetweenregularreflection(RR)andMachreflection(MR)oftypeVshock–shockinteractiononadouble-wedgegeometrywithhightemperaturenon-equilibriumeffectsisinvestigatedbyextendedshock-polarmethodandnumericalsimulation.First,thecriticalanglesoftransitionfromdetachmentcriterionandvonNeumanncriterionaredeterminedbytheextendedshock-polarmethodconsideringthenon-equilibriumeffects.Thenwavepatternsandthetransitionprocessarenumericallyobtained.Resultsofthecriticaltransitionanglesfromshock-polarcalculationandnumericalsimulationshowevidentdisagreement,indicatingtransitionmechanismbetweenRRandMRoftypeVinteractionischanged.Bycomparingwiththefrozencounterpart,itisalsofoundthatnon-equilibriumeffectsleadtoalargercriticalwedgeangleandalargerhysteresisinterval.

简介：TheRichtmyer–Meshkovinstabilityofa‘V'shapedair/heliumgaseousinterfacesubjectedtoaweakshockwaveisexperimentallystudied.Asoapfilmtechniqueisadoptedtocreatea‘V'shapedinterfacewithaccurateinitialconditions.Fivekindsof‘V'shapedinterfaceswithdifferentvertexanglesareformedtohighlighttheeffectsofinitialconditionsontheflowcharacteristics.Theresultsshowthataspikeisgeneratedaftertheshockimpact,andgrowsconstantlywithtime.Asthevertexangleincreases,vorticesgeneratedontheinterfacebecomelessnoticeable,andthespikedevelopslesspronouncedly.Thelineargrowthrateofinterfacewidthaftercompressionphaseisestimatedbyalinearmodelandarevisedlinearmodel,andthelatterisproventobemoreeffectivefortheinterfacewithhighinitialamplitudes.Thelineargrowthrateofinterfacewidthis,forthefirsttimeinaheavy/lightinterfaceconfiguration,foundtobeanon-monotonousfunctionoftheinitialperturbationamplitude–wavelengthratio.

简介：Dispersionofmulti-walledcarbonnanotubesinpoly(p-phenylene)compositeexposedtotoluenewasexperimentallyinvestigated.3mgofmulti-walledcarbonnanotubeswithnominalsizeof20nmwascompoundedwith30mgofpoly(p-phenylene)withthepresenceofterpineolasbindinginitiator.Toinvestigateanoptimalconditionforhomogenizingallconstituents,ultrasonicationwithanoutputpowerof750Wwasemployedwithcompoundingtimeof3,10,20and30min.WithFTIRanalyses,itcouldbeconfirmedthathomogeneouscompositeofmulti-walledcarbonnanotubesandpoly(p-phenylene)couldbeprepared.SEManalyseswerealsoconductedtoexaminethedispersionofmulti-walledcarbonnanotubesinthepolymermatrix.Thenintrinsicelectricalresistanceofthecompositesafterbeingexposedtotoluenewasalsoinvestigated.Itwasfoundthatthecompositefilmpreparedwithultrasonicationfor20mincouldprovidesufficientlysensitiveresponsewithrespecttovariedconcentrationoftoluene.