简介：Thisresearchreportsthepreparationandcharacterizationofcoppernanoparticlesmodifiedbydidecylbenzenesulfonate(DBS),TheCunanoparticles'sizewasdeterminedtobe40nmbytransmissionelectronmicroscope(TEM).TheX-rayphotoelectronspectrometry(XPS)resultsshowthatthereareinteractionsbetweenthecoppernanoparticlesandDBSfunctiongroup.Thenonlinearopticalpropertieswerestudiedbythefour-wavemixingmethod.Thevalueofx^(3)/α0wasfoundtobe6.9×10^-11esucm.

简介：

简介：Thezonalfieldseffectonthebeta-inducedAlfveneigenmode(BAE)destabilizedbytheenergeticparticlesintoroidalplasmasisstudiedthroughthegyrokineticparticlesimulations.ItisfoundthatthelocalizedzonalfieldswithanegativevaluearoundthemoderationalsurfacearegeneratedbythenonlinearBAE.Intheweaklydrivencase,thezonalfieldswithastronggeodesicacousticmode(GAM)componenthaveweakeffectsonthenonlinearBAEevolution.Inthestronglydrivencase,thezonalfieldsaredominatedbyamoresignificantzerofrequencycomponentandhavestrongereffectsonthenonlinearBAEevolution.

简介：Inthisresearch,thenonlinearevolutionofjet-likespikesinthesingle-modeablativeRayleigh-Taylorinstability(ARTI)inthepresenceofpreheating,isstudiednumerically.Itisdemonstratedthatthepreheatingplaysanessentialroleintheformationofjet-likespikesinthenonlinearARTI.Theevolutionofjet-likespikesintheARTIwithpreheatingconsistsofthreestageswithdistinctlydifferentdistinguishingfeatures.Intheearlystage,thepreheatingcontributestosignificantlyincreasethedensity-gradientscalelengthandbroadenthevelocityprofileoftheablationsurface,wheretheformercanreducethelineargrowthoftheARTIandmitigatethegrowthofitsharmonics.Inthemiddlestage,theablativeKelvin-Helmholtzinstabilityisdramaticallysuppressedduetotheablationeffects.Inthelatestage,thejet’slength(i.e.bubble-spikeamplitude)isfurtherincreasedbythebubbleaccelerationinthehighlynonlinearARTI,resultingeventuallyintheformationofjet-likespikes.