简介:WeprovideanewexpressionofthequantumFisherinformation(QFI)forageneralsystem.Utilizingthisexpression,theQFIforanon-fullrankdensitymatrixisonlydeterminedbyitssupport.Thisexpressioncanbringconvenienceforaninfinite-dimensionaldensitymatrixwithafinitesupport.Besides,amatrixrepresentationoftheQFIisalsogiven.
简介:TheAtomicWeaponsEstablishment(AWE)istaskedwithsupportingContinuousAtSeaDeterrence(CASD)bycertifyingtheperformanceandsafetyofthenationaldeterrentintheComprehensiveTestBanTreaty(CTBT)era.Thismeansthatrecoursetofurtherundergroundtestingisnotpossible,andcertificationmustbeachievedbysupplementingthehistoricaldatawiththeuseofcomputercalculation.Inordertofacilitatethis,AWEoperatessomeofthelargestsupercomputersintheUK.Tovalidatethecomputercodes,andindeedthedesignerswhoareusingthem,itisnecessarytocarryoutfurtherexperimentsintherightregimes.Anexcellentwaytomeetmanyoftherequirementsformaterialpropertydataandtoprovideconfidenceinthevalidityofthealgorithmsisthroughexperimentscarriedoutonhighpowerlaserfacilities.
简介:IntheGCMwestudysomepropertiesofπmesonastheGoldstonebosonsinanuclearmatterwithfinitedensity.Usingtheeffectiveactioninanuclearmatter,wecalculatethedecayconstantandπmassasfunctionsofthechemicalpotential.Therelationbetweenthechemicalpotentialandthedensityofanuclearmatterisfirstlygivenhere.Wefindthatfπandmπmonotonouslydecreaseasnuclearmatterdensityincreases.Theresultisconsistentwiththeusualassumptionthatthechiralsymmetryisgraduallyrestoredasthedensityofanuclearmatterincreases.
简介:Transformationacousticsareconcentratedforthepurposeofdesigningnovelacousticdevicestotailoracousticwavestoachievedesirablecharacteristics.However,thesedevicesrequirefluidorfluid-likematerialswithananisotropicdensitythatgenerallydoesnotexistinnature.Therefore,weintroducepentamodemetamaterialsintoanalternatingmultilayerisotropicmediummodeltobuildfluid-likemetamaterialswithananisotropicdensity.A2Dacousticbendingbasedontransformationacousticsisestablishedandinvestigatedtoverifyourmethod.Thisideaprovidesamethodtodesignbroadbandandphysicallyrealizableacousticmetamaterialswithananisotropicdensityandismeaningfulforthedesignofacousticmetamaterials.
简介:Thispaperpresentsanewmethodtocontrolthepositionofamicro-columnsnowtarget.Thistargetenablesthemeasurementofthemeanelectrondensityofthepre-plasmacreatedbyapre-pulsewithdifferenttimedelays.Thisresearchwillallowabetterunderstandingofthegenerationoffastprotonsfromtheinteractionbetweenastructuredpre-plasmaandahighintensitylaser.
简介:Recentresearchactivitiesrelevanttohighenergydensityphysics(HEDP)drivenbytheheavyionbeamattheInstituteofModernPhysics,ChineseAcademyofSciencesarepresented.RadiographyofstaticobjectswiththefastextractedhighenergycarbonionbeamfromtheCoolingStorageRingisdiscussed.Investigationofthelowenergyheavyionbeamandplasmainteractionisreported.WithHEDPresearchasoneofthemaingoals,theprojectHIAF(HighIntensityheavy-ionAcceleratorFacility),proposedbytheInstituteofModernPhysicsasthe12thfive-year-planofChina,isintroduced.
简介:ThisworkpresentsanopticalmethodusingtheMach–Zehnderinterferometer.Weespeciallydiagnoseapurenitrogengassubjectedtoapointtoplanecoronadischarge,andvisualizethedensityspatialmap.Theinterelectrodedistanceequals6mmandthevariationoftheopticalpathhasbeenmeasuredatdifferentpressures:220Torr,400Torr,and760Torr.TheinterferogramsarerecordedwithaCCDcamera,andthenumericalanalysisoftheseinterferogramsisassuredbytheinverseAbeltransformation.ThenitrogendensityisextractedthroughtheGladstone–Dalerelation.Theobtainedresultsareincloseagreementwithvaluesavailableintheliterature.
简介:Wecalculatethetwo-pioncorrelationfunctionforanexpandinghadronsourcewithafinitebaryondensity.Thespace-timeevolutionofthesourceisdescribedbyrelativistichydrodynamicsandtheHanbury-Brown-Twiss(HBT)radiusisextractedaftereffectsofcollectiveexpansionandmultiplescatteringontheHBTinterferometryhavebeentakenintoaccount,usingquantumprobabilityamplitudesinapath-integralformalism.WefindthatthisradiusissubstantiallysmallerthantheHBTradiusextractedfromthefreeze-outconfiguration.
简介:Inthispaper,thecalculatingmethodoftheplasmaelectrondensitybasedontheHCNwaveformdataisintroduced.ThewaysdecidingthebasevoltageandthephasezerocrosspointsoftheHCNsignals,phaseandcomputingthedensityaredescribed.Moreover,someideasforthefurtherimprovementofthemethodarealsonoticedinthearticle.
简介:Byusingthetechniqueofintegrationwithinanorderedproductofoperators,thenormalordereddensityoperatorofthephoton-subtractedsqueezedthermalstate(PSSTS)isderived.ThenthecorrespondingWignerfunctionispresentedbyusingthecoherentstaterepresentationoftheWigneroperator.ThenonclassicalpropertiesofthePSSTSarediscussedbasedonthenegativityoftheWignerfunction.
简介:Waveguidesuperlattices,aspecialtypeofwaveguidearrays,canbedesignedtoachieveverylowcrosstalkatsubmicrometer/subwavelengthpitches.Thetheoreticalframeworkanddesignrationalesforsuchwaveguidesuperlatticeswillbepresentedindepth.Waveguidesidewallroughnesscanhelptodeterthecoherentcouplingbetweenidenticalwaveguidesinnearbysupercells,butitalsoinducesrandomfluctuationoftransmission.Statisticalbehaviorofthetransmissionduetoroughnessinawaveguidesuperlatticeissystematicallytreated.Complextransmissioncharacteristicsduetospectraloscillationandrandomroughnesswillbepresented,andtheirevolutionwiththesuperlatticelengthwillbeanalyzed.