简介：Cold-stretchedpressurevesselsfromausteniticstainlesssteels(ASS)arewidelyusedforstorageandtransportationofliquefiedgases,andhavesuchadvantagesasthinwallandlightweight.Fatigueisanimportantconcerninthesepressurevessels,whicharesubjectedtoalternativeloads.Eventhoughseveralcodesandstandardshaveguidelinesonthesepressurevessels,therearenorelevantdesignmethodsonfatiguefailure.TounderstandthefatiguepropertiesofASS1.4301(equivalentsincludeUNSS30400andAISI304)insolution-annealed(SA)andcold-stretchedconditions(9%strainlevel)andtheresponseoffatiguepropertiestocoldstretching(CS),low-cyclefatigue(LCF)testswereperformedatroomtemperature,withtotalstrainamplitudesrangingfrom-.4%to-.8%.Martensitetransformationsweremeasuredduringthetests.Comparisonsoncyclicstressresponse,cyclicstress-strainbehavior,andfatiguelifewerecarriedoutbetweenSAandCSmaterials.ResultsshowthatCSreducestheinitialhardeningstage,butprolongsthesofteningperiodinthecyclicstressresponse.Martensitetransformationhelpsformastableregimeandsubsequentsecondaryhardening.Thestressesofmonotonicandcyclicstress-straincurvesareimprovedbyCS,whichleadstoalowerplasticstrainandamuchhigherelasticstrain.ThefatigueresistanceoftheCSmaterialisbetterthanthatoftheSAmaterial,whichisapproximately1?03to2?04cycles.TheS-NcurveoftheASMEstandardforASSiscomparedwiththefatiguedataandisjustifiedtobesuitableforthefatiguedesignofcold-stretchedpressurevessels.However,consideringtheCSmaterialhasabetterfatigueresistance,theS-Ncurvewillbemoreconservative.ThepresentstudywouldbehelpfulinmakingfulluseoftheadvantagesofCStodevelopanewS-Ncurveforfatiguedesignofcold-stretchedpressurevessels.

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简介：AdeuteronpossessesacoulombpotentialbarrierwithmaximumUmax≈10^6eV(atro=1.51×10^-13cm)aroundhim.Soprerequisitetodirectcollideandexcitenuclearfusionreactionfortwodeuteronsistopenetratetoallofoppositebarrier.

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简介：固体加速长度在一张冷稠密的运输病床上被调查(0.10中间的

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简介：我们实现在我们87Rb空间寒冷原子钟，它在单程的模式操作。几修正在我们的以前的物理、光的系统上被做。在最高的察觉地区的有效原子信号与87%被增加到2.5次抽效率。冷原子云的温度被1.4K增加。我们在抽的激光紧张和detuning上学习有效信号获得和抽的效率的依赖。转变的效果被讨论。这种技术可以在未来空间寒冷原子钟被使用。

简介：Numericalanalysesofthecoldturbulentflowinmodelcombustionchambersweremadebyusingκ.εturbulentmodel.ThehybriddifferenceschemeandSNIPmethodwereemployed.Numericalsolutionsforretouchmentlengthandvelocitydistributionswereobtainedintherecirculatingzoneofthecombustionchambers.Thecalculationresultswereinfairlygoodagreementwiththereportedexperimentaldata.Theworkpresentedinthispaperwasabasicpartofthecalculationmodelofsudden-enlargedcombustionchambers.

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简介：我们在场在高度反响的媒介的极端慢的明亮、黑暗的光solitons的形成上的系统的研究。由调查，四一生拓宽了原子系统，即，三状态的A类型和串联类型计划，和四状态的N类型和cascade-typeschemes，我们证明在冷原子系统的如此的极端慢的soh'tons的形成是相当通用的现象。

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简介：Vanadiumalloys,especiallythatofV4Cr4Ti,aresupposedasthepromisingcandidatestructuralmaterialforfusionapplicationsfortheirgoodthermalproperties,hightemperaturestrengthandtheinherentlowactivationcharacteristics.However,inrecent

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简介：Theplasticanisotropyofsheetmetalisusuallycausedbypreferredorientationofgrains,developedbymechanicaldeformationandthermaltreatment.Inthepresentstudy,aTaylor-likepolycrystalmodelsuggestedbyAsaroandNeedlemanisappliedtoinvestigatetheevolutionoftheanisotropicbehaviorofafacecenteredcubic(FCC)polycrystallinemetal,whichithasundergoneaplane-straincompressionthatrationallysimulatesthecoldrollingprocessofFCCpolycrystallinepurealuminium.ByusingtheTaylor-likepolycrystalmodel,polefiguresareobtainedtodescribethetexturedevelopmentofpolycrystallineaggregateafterplane-straincompression,andthentheplasticanisotropyofpolycrystallineaggregateisevaluatedbystretchingthepolycrystallineaggregateindifferentdirectionintermofyieldstress.Accordingtotheresults,thecontoursoflongitudinalflowstressinthree-dimensionalorientationspacearegivenandanalyzed.ExperimentresultssimilartothepredictionofplanaranisotropycanbefoundintheliteraturewrittenbyTakahashietal.thatindirectlyshowthecorrectnessofthepredictionofnon-planarplasticanisotropybythisanalysis.

简介：Wereportonthemodificationofthewettabilityofstainlesssteelbypicosecondlasersurfacemicrostructuringinthispaper.Comparedwithtraditionalmethods,picosecondlaser-inducedsurfacemodificationprovidesafastandfacilemethodforsurfacemodificationwithoutchemicaldamageandenvironmentalpollution.Asaresultoftreatmentby100pslaserpulses,microstructuresarefabricatedonthestainlesssteelsamplesurface,contributingtotheincreaseofthecontactanglefrom88°to105°,whichrealizesatransformationfromhydrophilicitytohydrophobicity.Themorphologicalfeaturesoffabricatedmicrostructuresarecharacterizedbyscanningelectronmicroscopyandopticalmicroscopy.

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