简介：Westudytarget-searchingprocessesonapercolation,onwhichahuntertracksatargetbysmellingodorsitemits.Theodorintensityissupposedtobeinverselyproportionaltothedistanceitpropagates.TheMonteCarlosimulationisperformedona2-dimensionalbond-percolationabovethethreshold.Havingnoideaofthelocationofthetarget,thehunterdeterminesitsmovesonlybyrandomattemptsineachdirection.Forlagerpercolationconnectivityp(＞～)0.90,itrevealsascalinglawforthesearchingtimeversusthedistancetothepositionofthetarget.Thescalingexponentisdependentonthesensitivityofthehunter.Forsmallerp,thescalinglawisbrokenandtheprobabilityoffindingoutthetargetsignificantlyreduces.Thehunterseemstrappedintheclusterofthepercolationandcanhardlyreachthegoal.

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简介：ThisarticledescribesthefabricationofasuiteoflasertargetsbytheTargetFabricationgroupintheCentralLaserFacility(CLF),STFCRutherfordAppletonLaboratoryforthefirstacademic-accessexperimentontheOrionlaserfacility(Hoppsetal.,Appl.Opt.52,3597–3601(2013))atAtomicWeaponsEstablishment(AWE).Thisexperiment,partofthePOLARproject(Falizeetal.,Astrophys.SpaceSci.336,81–85(2011);Busschaertetal.,NewJ.Phys.15,035020(2013)),studiedconditionsrelevanttotheradiation-hydrodynamicprocessesoccurringinaremarkableclassofastrophysicalstarsystemsknownasmagneticcataclysmicvariables.Alargenumberofcomplexfabricationtechnologiesandresearchanddevelopmentactivitieswererequiredtofieldatotalof80high-specificationtargets.Targetdesignandfabricationproceduresaredescribedandinitialalignmentandcharacterizationdataarediscussed.

简介：Thedesignsofinertialconfinementfusion(ICF)targets,whichfieldonShenGuangIII,arebecomingmorecomplexandmorestringentintermsofassemblyprecision.Akeyspecificationofthesetargetsisthespatialanglealignmentaccuracy.Tomeettheseneeds,wepresentanewspatialangleassemblymethod,usingtargetpart's3Dmodel-baseddualorthogonalcameravision,whichisbettersuitedfortheflexibleautomationoftargetassemblyprocesses.Thetwo-handsstructuremicromanipulatesystemanddualorthogonalstructurevisualfeedbacksystemwereinvestigatedbyconsideringthekinematics,spatialanglemeasuring,andmotioncontrolinanintegratedway.Inthispaper,wediscussthemeasurementaccuracyofspatialangleassemblymethod,whichcomparedthereal-timeimageacquisitionwiththeredrawing2Dprojection.Theresultshowsthattheassemblymethodproposedisveryeffectiveandmeetstherequirementsofangleassemblyaccuracy,whichislessthan1°.Also,thisworkisexpectedtocontributegreatlytotheadvancementofothertargetmicroassemblyequipments.

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简介：熔化力量输出不仅与参予反应的燃料粒子数字密度而且到熔化反应率系数成正比(或反应)，它依赖于反应物速度分发功能。他们通常被假定是有为热核聚变情形的一样的温度的双Maxwellian分发功能。不管多么高驱动中立横梁注射和少数离子种类ICRF血浆加热，或多拧的血浆横梁迎头向前的碰撞，在收敛，区域在未来被要求并且调查大规模熔化反应堆，当时，源于电离或费用交换的注射精力充沛的快离子尾巴的部分将足够大，他们对non-Maxwellian分发功能的贡献不是可以忽略的，因此评估fu的系数或计算到熔化反应在如此的情况，横梁目标，和横梁横梁反应改进中，效果贡献应该起很重要的作用。在这份报纸，为不同横梁和目标联合情形计算熔化反应率系数的几个有用公式详细被导出。

简介：Theeffectsofdilatationalphasetransformationonthetargetstrengthofceramicmateri-alsareinvestigatedbasedonTate’smodel.Theconstitutivebehaviorofmaterialsindifferentregions(elastic,cracked,plasticandphasetransformation)aretakenintoaccount.Itisfoundthat,withaproperchoiceofmaterialparameters,thedilatationalphasetransformationcanincreaseeffectivelythetargetstrengthR_t.Thiswouldbeofimportanceinpenetration-resistancedesign.

简介：Theinfluenceoftheaxialrelativemotionbetweenthetargetandthesourceonghostimaging(GI)isinvestigated.BoththeanalyticalandexperimentalresultsshowthatthetransverseresolutionofGIisreducedasthedeviationofthetarget’scenterpositionfromtheopticalaxisortheaxialmotionrangeincreases.Toovercomethemotionblur,weproposeadeblurringmethodbasedonspeckle-resizingandspeedretrieval,andweexperimentallyvalidateitseffectivenessforanaxiallymovingtargetwithanunknownconstantspeed.Theresultsdemonstratedherewillbeveryusefultoforward-lookingGIremotesensing.

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简介：Taylorimpactisawidelyusedstrategyinwhichaflat-nosedprojectileisfiredontoarigidanvildirectlytodeterminethedynamicstrengthofrodspecimens.Nowadays,therigidanvilisoftenreplacedbyanoutputtargetbartoensuretheaccuracyofmeasurementviarecordingstrainsignalsintheoutputbar.Fortestingthedynamicstrengthoflow-densitymaterials,alow-impedancetargetbar,whichexhibitsviscoelasticcharacteristicsisoftenemployed.Inthispaper,anextendedTaylormodelisproposedtoimprovetheidealizationoftreatingthetargetbarasperfectlyrigidmaterialintheclassicTaylormodel,andtheviscoelasticeffectofthetargetbarisincorporated.Theviscoelastictargetbarisdepictedbytwoelasticspringsandonedashpot.Basedontheplasticshockwavetheoryintheflat-nosedprojectileassociatedwiththeviscoelasticwaveanalysisinthetargetbar,theviscoelasticeffectofthetargetbarontheimpactresponseoftheflat-nosedprojectileisinvestigated.Thefiniteelementsimulationisalsocarriedouttoverifythetheoreticalmodel,andgoodagreementisfound.ThepresenttheoreticalmodelisalsocalledtheTaylor-cylinderHopkinsonimpact,whichprovidesamoreaccuratewaytoidentifythedynamicmaterialparameters.Thedynamicresponsesofthepresentmodelarefurthercomparedwithpreviouselasticandrigidtargetbarmodels.ItisfoundthattheviscoelasticeffectofthetargetbarshouldbetakenintoconsiderationintheTaylor-cylinderHopkinsonimpacttestforlow-impedancematerials.

简介：Auniqueapproachforpermeationfillingofnonpermeableinertialconfinementfusiontargetcapsuleswithdeuterium-tritium（DT）ispresented.Thisprocessusesapermeablecapsulecoupledintothefinaltargetcapsulewitha0.03-mm-diameterfilltube.Leakfreepermeationfillingofglow-dischargepolymerization（GDP）targetsusingthismethodhavebeensuccessfullydemonstrated,aswellasicelayeringofthetarget,yieldinganinnericesurfaceroughnessof1-μmrms（rootmeansquare）.Finally,themeasuredDTice-thicknessprofileforthisexperimentwasusedtovalidateathermalmodel＇spredictionofthesamethicknessprofile.

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简介：Theimprovedlaser-to-pedestalcontrastratioenabledbycurrenthigh-powerlaserpulsecleaningtechniquesallowsthefinefeaturesofthetargetsurvivebeforethemainlaserpulsearrives.Weproposetointroducethenano-fabricationtechnologiesintolaser–plasmainteractiontoexplorethenoveleffectsofmicro-structures.Wefoundoutthatnotonlylaser-drivenparticlesourcesbutalsothelaserpulseitselfcanbemanipulatedbyspecificallydesignedmicro-cylinderand-tubetargets,respectively.Theproposalwassupportedbyfull-3Dparticle-in-cellsimulationsandsuccessfulproofof-principleexperimentsforthefirsttime.Webelievethiswouldopenawaytomanipulaterelativisticlaser–plasmainteractionatthemicro-sizelevel.

简介：Spacecraftsciencemissionstoplanetsorasteroidshavehistoricallyvisitedonlyoneorseveralcelestialbodiespermission.Theresearchgoalofthispaperistocreateatrajectorydesignalgorithmthatgeneratestrajectoryallowingaspacecrafttovisitasignificantnumberofasteroidsduringasinglemission.Fortheproblemofglobaltrajectoryoptimization,evenwithrecentadvancesinlow-thrusttrajectoryoptimization,afullenumerationofthisproblemisnotpossible.Thisworkpresentsanalgorith...

简介：Spallationtargetrepresentsoneofthemostchallengingcomponentsinacceleratordrivensystems(ADS)sinceitisthecomponentcouplingtheacceleratorandthesub-criticalcore.Itissubjectedtobombardmentofintenseprotonbeamandveryhighthermalloadinastrongradiationfield.TheirradiatedLBEtargetposesseverehandlingproblemsforthemaintenancestaffandotherscientistsduetoitsresidualactivity[1].ToassistthedesignofADS,thegeneralradiologicalsafetyaspectsoflead,lead-bismutheutectic(LBE)andtungstenspallationtargetwerestudiedwithMCNPX2.7code[2].Thespallationtargetwasirradiatedbya250MeV,10mAprotonbeamproducedbyalinearprotonaccelerator.Theneutronyield,neutronspectrum,residualproductionandtimeevolutionfortheirradiatedtargetwereanalyzed.

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