简介：

简介：

简介：

简介：TungstenisenvisagedasoneofthemaincandidatematerialsfordivertorplateofITERandfuturefusionreactors.DuetoD-Treaction,PFMswouldsufferheliumirradiationfromplasmaadditionaltothehighheatloads.Heliumretentionandthermaldesorptionbehaviorarelargelyconcerned.

简介：Microplasmasareveryinterestingduetotheiruniquepropertiesandachievableregimesmaintainedatatmosphericpressures.Duetothesmallscales,numericalmodelingcouldcontributetotheunderstandingofunderlyingphenomenaasitprovidesaccesstolocalparameters—andcomplementsexperimentalglobalcharacteristics.Aself-consistentformalism,appliedtonanosecondpulsedatmosphericnon-equilibriumheliumplasmas,revealsthatseveralsuccessivedischargescanpersistasaresultofacombinedvolumeanddielectricsurfaceeffects.Thevaluableinsightsprovidedbythespatiotemporalsimulationresultsshowthecriticalimportanceofcoupledgasandplasmadynamics—namelygasheatingandelectricfieldreversals.

简介：JUNA(JinpingUndergroundlaboratoryforNuclearAstrophysics)isplaningtomeasurethe13C(α,n)16OandsomeotherimportantreactionsatorclosetostellarenergiesusingintenseheliumbeamoutofanECRdrivenacceleratorinJinpingUndergroundlaboratory[1].Deuteriumimpurityinionsourcewillproducessignificantamountofneutrons,limitingthebackgroundlevel.Tocontrolthedeteriumimpurity,wehavedevelopedamethodtomeasurethedeuteriumimpuritywithinHeliumbeamusingthed(d,p)treaction.

简介：Aone-dimensionalfluidmodelforhomogeneousatmosphericpressurebarrierdischargesinheliumispresentedbyconsiderilagelementaryprocessesofexcitationandionizationincludingametastableatomeffect.Usingthismodelweinvestigatethebehavioursoftheheliummetastableatomsindischargesaswellastheirinfluenceonthedischargecharacteristics.Itisshownthatthemetastableatomswitharelativelyhighconcentrationduringthedischargearemainlyproducedintheactivephaseofthedischargeanddissolvedintheoffphase.Itisalsofoundthatthemetastableatomcollisionscannotonlyprovideseedelectronsfordischargesbutalsoinfluencetheconcentrationofions.Areductionofmatestableatomdensityresultsinadropinthechargedparticledensitiesandcausesaqualitativechangeinthedischargepatterns.

简介：Theanisotropicpotentialdevelopedinourpreviousresearchandtheclose-couplingmethodareappliedtotheHBr-3He(4He,5He,6He,7He)system,andthepartialcrosssections(PCSs)attheincidentenergyof60meVarecalculated.Basedonthecalculations,theinfluencesoftheisotopeheliumatomonPCSsarediscussedindetail.TheresultsshowthattheexcitationPCSsconvergefasterthantheelasticPCSsforthecollisionenergyandthesystemsconsideredhere.AlsotheexcitationPCSsconvergemorerapidlyforthehigh-excitedstates.Thetaileffectispresentonlyinelasticscatteringandlow-excitedstatesbutnotinhigh-excitedstates.Withtheincreaseofreducedmassofthecollisionsystem,theconvergingspeedoftheelasticandexcitationPCSsslowsdown,andthetaileffectgoesup.

简介：

简介：当量力学，严肃，和热力学同时被考虑时，我们考虑量波浪包的重力的效果。在严肃的热力学的起源的假设下面，我们建议一个一般方程描述量波浪包的重力的效果。在古典限制，这个方程同意引力的牛顿法律。为量波浪包，然而，它预言排斥重力的效果。我们用超流体氦建议一个试验性的计划测试这排斥重力的效果。我们的研究证明与象超导的gravimetry和冷原子interferometry那样的现在的技术，为超流体氦的排斥重力的效果的测试在试验性的活动范围以内。

简介：

简介：Hydrodynamicpropertiesandstructureofstrongshockwavesinclassicaldenseheliumaresimulatedusingnon-equilibriummoleculardynamicsmethods.Theshockspeedinthesimulationreaches100km/sandtheMachnumberisover250,whichareclosetotheparametersofshockwavesintheimplosionprocessofinertialconfinementfusion.Thesimulationsshowthatthehigh-Mach-numbershockwavesindensemediahavenotabledifferencesfromweakshockwavesorthoseindilutegases.Theseresultswillprovideusefulinformationontheimplosionprocess,especiallythestructureofstrongshockwavefront,whichremainsanopenquestioninhydrodynamicsimulations.

简介：Inthispaper,theobtainedexperimentalresultsconcerningcreationofbulkelementaryexcitations(BEEs)iniso-topicallypureliquid4Heatlowtemperatures~60mKarediscussed.Positiverotons’(R+-rotons)creationbyapulsedheaterwasstudied.Signalswererecordedforthefollowingquantumprocesses:quantumevaporationof4He-atomsfromthefreeliq-uid-heliumsurfacebytheBEEsoftheliquidhelium-II,andBEEsreflectionfromthefreesurfacebackintothebulkliquid.Typicalsignalsareshown,andratiosofsignalamplitudesareevaluated.Forlongheaterpulsesfrom5to10μs,appearanceofthesecondatomiccloudconsistingofevaporated4He-atomswasobservedinadditiontothefirstatomiccloud.Itisthoughtthatthefirstatomiccloudoftheevaporatedheliumatomsconsistsofveryfast4He-atomswithenergies~35Kevaporatedbypositiverotonswiththespecialenergies~17K(~2ER~2×8.6KwithERrepresentingtherotonminimumenergy)correspondingtothethirdnon-dispersiveZakharenkowave.Thesecondcloudofslower4He-atomswascreatedbysurfaceelementaryexcitations(SEEsorripplons)possessingthespecialenergies~7.15Krepresentingthebindingenergy.ItwasassumedthatsuchSEEscanbecreatedbyphononsincomingtotheliquidsurfacewithspecialenergies~6.2Kcorrespondingtothefirstnon-dispersiveZakharenkowave,whichcaninteractattheliquidsurfacewiththesamephononsalreadyreflectedfromthesurfaceforlongheaterpulses.Also,somepulsed-heatercharacteristicswerestudiedinordertobetterunderstandthefeaturesofsuchheatersinlowtemperatureexperi-ments.

简介：Wereportontheexperimentalobservationoftheairflowmotioninducedbyan800nm,1kHzfemtosecondfilamentinacloudchamberfilledwithairandhelium.Itisfoundthatvortexpairswithoppositerotationdirectionsalwaysformbothbelowandabovethefilaments.WedonotobservethatthevorticesclearlyformedabovethefilamentinairjustbecauseoftheformationofsmallerparticleswithweakerMiescattering.Simulationsoftheairflowmotioninheliumareconductedbyusingthelaserfilamentasaheatsource,andthesimulatedpatternofvorticesandairflowvelocityagreewellwiththeexperimentalresults.更多还原

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：在主要Yishui-Tangtou差错的脚墙的花岗石的碎裂岩withmylontization招待的Longquanzhan金矿床。在液包体的~3He/~4He比率从0。14～0。24R/Ra，近到那些，外壳来源helium.~(40)，Ar/~(36)Ar比率被测量是289-1811，比那些稍微高大气的氩。氦和氩同位素的分析的结果建议形成矿石的液体从外壳主要被导出。δ~(18)O每千每千从静脉石英范围from-1.78液包体珍视到4.07，并且δD液包体珍视在-74per之间变化千并且-77每千。氢和氧同位素数据显示了为Longquanzhan金矿床的液体在矿化作用的过程与天落水混合了的那形成theore。这与从氦和氩同位素数据的结论一致。

简介：

简介：

简介：

简介：