简介：氧化的本质穿cenmented的machanism碳化物工具基于热力学被学习。标准吉布斯在在不同温度切过程的可能的反应的免费精力用物质吉布斯被计算反应可能性顺序的免费精力功能方法，和顺序象每反应的特征一样被研究。理论计算显示出那WO3,公司3O4,TiO2和CoWO4是主要resultants，它与实验结果被证明。

简介：OnthebasisOftheYoung-LaplaceEquationthatdescribesthepressuredifferencebetweeneachsideofacurvedliquidsurface,astaticequilibriummodelisestablishedtodescribethesurfaceshapeoftheweldbead.Thegeo-metricalmodelforthemoltenpoolisincluded,whichisessentialtoexplaintheundercutphenomenonduringhighspeedbead-on-platewelding.Theresultsgotfromaniterationalgorithmshowthatitistheforcebalanceontheliquidmixtureofthedepositedmetalandthedepositedmetalandthemoltenbasemetalandthemoltenbasemetalthatcausestheundercut.Somefactorsandtheireffectsarealsoana-lyzed.

简介：Thisstudyanalyzestheevolutionofcarbidesinthetemperingprocessofanewlydevelopedsemi-highspeedsteelcoldforgedrollwithnitrogenadditionusingatransmissionelectronmicroscope(TEM)equippedwithanenergydispersiveX-ray(EDX).TheprecipitationsequenceofthecarbideswasidentifiedintheentiretemperingprocessanditcanbeexpressedasM3C→M3C+M(C,N)Ⅱ→M(C,N)Ⅱ+M7C3Ⅱ+M23C6.ThesecondaryhardeninginthetemperingprocesswasmainlyduetothedispersedprecipitationoffineM(C,N)Ⅱparticles.ThedissolutionofM3CtemperedathightemperaturesinducedtheprecipitationandcoarseningofM7C3ⅡandM23C6.

简介：A1.3-μmwavelengthvertical-mesaridgewaveguidemulitple-quantum-well(MQW)distributedfeedback(DFB)laserwithhighdirectlymodulatedbandwidthandwideoperationtemperaturerangeisreported.Withtheoptimizationofthestrained-layerMQWsintheactiveregion,thesurroundinggraded-indexseparated-confinement-heterostructurewaveguidelayers,togetherwiththeoptimizationofthedetuningandcouplingcoefficientoftheDFBgrating,highdirectlymodulationbandwidthof16GHzatroomtemperatureandwideworkingtemperaturerangefrom-40to85℃areobtained.Themeantimetofailure(MTTF)isestimatedtobeover2×10~6h.Thedeviceissuitableaslightsourceofhigh-bit-rateopticaltransmitterswithsmallsizeandreducedcost.

简介：有非线性赔偿的一个高速度列平行CDS/ADC电路在这份报纸被建议。相关双采样(CDS)和analog-to-digital变换器(模数转换器)工作基于二漂浮门inverters和开关电容器网络集成于一个三阶段的列平行电路。传统的单个斜坡的模数转换器的变换率被划分量子化到粗糙的步和好步加快。一个存储电容器被用来存储粗糙的步的结果并且定位好步的斜面信号的节，它能从2n把钟步骤归结为2(n/2+1)。漂浮的门inverters被实现减少电源消费。它的导致的非线性的偏移量被把一个赔偿模块介绍给inverter的输入取消，它能在建议电路的三个阶段使相等联合路径。这个电路与640为互补金属氧化物半导体图象传感器被设计并且模仿，

简介：Purenitrogengaswasheatedwithdirectcurrentarc,atinputpowersfromseveralhundredWtoover5kW,andtheninjectedthroughanozzleintoachamberat1or10Papressure,withthepurposeofacceleratingthegastoveryhighspeedaround7km/s.Variousstructuresofthearcgeneratorandgasexpansionnozzlewereexamined.Resultsshowthatbypassexhaustingoftheboundarylayerbeforeitentersthenozzledivergentsectioncangreatlyincreaseflowspeedofthejet,thusitmightbepossibletousenitrogenasaworkinggasinhighspeedgasdynamictestfacilities.att

简介：Anewandeffcientthree-dimensionalimplicithybrdschemeforEulerequatiopnsispresented.ThebasicschemeisthecouplingoftheJamesonandTurkel'sLUdecompositionsandProf.ZhangHanxin'sNNDconcept.TheimprovedLUdecompositionsareappliedtodiscretizedtheimplicitpartoftheEulerEquationsandZhang'smodifiedfluxfunctiontocalculatetherighthandsideoperatorsofthehybridscheme,Numericalcalculationsweremadeofsupersonicinletflowswithmixedexternal-internalcompressions,Someofthecomputedresultswerecomparedwithavailablewindtunneldata.

简介：Anon-linearoptical(NLO)materialwassynthesizedbymeansofasimplemethod.Thismaterialcanbeappliedinelectro-optical(EO)devices,suchasEOswitchesandmodulators.TheDisperseRed1(DR1)wasdopedinpolymethyl-methacrylate-co-glycidylmethacrylate(PMMA-co-GMA)astheNLOactivechromophore.Thesynthesisprocessandmaterialstructurewereexpressed.Thethermalproperties,surfacemorphologyandopticalcharacteristicsofthematerialwereinvestigatedbymeansofdifferentialscanningcalorimetry(DSC),thermogravimetricanalysis(TGA),atomicforcemicroscopy(AFM),andm-linestechnique.Usingthereflectiontechnique,thevalueoftheelectro-opticalcoefficientγ33wasmeasuredas11pm/Vatawavelengthof1310nm.AnEOswitchwithnanosecondresponsebasedonthismaterialhasbeenfabricated.

简介：Thewidthandspacingofadiabaticshearbands(ASBs)intheserratedchipsgeneratedduringhighspeedorthogonalcuttingof30CrNi3MoVstructuralsteelweremeasuredbyopticalmicroscopy(OM),thetemperatureriseintheshearbandwasestimated.ThemicrostructuresoftheASBswerealsocharacterizedbySEMandTEM.TheresultsshowthatthewidthandspacingofASBsdecreasewiththeincreaseofthecuttingspeed.ThefurtherobservationsshowthatthemicrostructurebetweenthematrixandthecenteroftheASBgraduallychanges,andthatthemartensiticphasetransformation,carbideprecipitationandrecrystallizationmayoccurintheASB.

简介：A100-Gb/shigh-speedopticaltransmitterisproposedandexperimentallydemonstrated.Basedonfrequency-quadruplingtechnique,twosub-channelswithafixed50-GHzspacingareobtainedfromonelasersource.Usingreturn-to-zerodifferentialquadraturephase-shiftkeying(RZ-DQPSK)modulationformatandpolarizationmultiplexing(PolMux),onlylow-speedelectronicdevicesof12.5GHzareneededforthe100-Gb/stransmitter.Thiseliminatestheneedofultrahigh-speedoptoelectronicdevicesandthusgreatlyreducesthecost.Theexperimentalresultsshowthatthistransmittercanachievegoodperfor-manceindispersiontoleranceofa25-kmsinglemodefiber(SMF).

简介：Thesingle-shotspiralmagneticresonanceimaging(MRI)techniquewasimplementedandoptimizedonaBrukerBiospec47/30scanner.Thetechniqueincludesthepulsesequenceforgenerationanddetectionofthek-spaceMRIsignal(freeinductiondecay(FID)),andPC-basedprogramsforthedatagridandimagereconstruction.Thetemporalresolutionis70ms(14imagespersecond),whichconsistsofadataacquisitiontimeasshortas13.7ms,aspin-echotimeof13.6msandamagnetizationrecoverytimeof43ms.Thismakesitpossibletotakereal-timeimagesofmovingobjects.Thetechniqueisdemonstratedusingapendulum(tube)filledwithwater.

简介：摘 要：文章针对高线分离爪气缸在使用过程中存在的故障进行分析，对影响分离爪气缸缸故障的问题进行改进。

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简介：Si16Sb84-based线房间阶段变化随机存取记忆(PCRAM)，在哪个Si16Sb84阶段变化线被听电极与nanoscale差距联系，被为重设操作的最低当前、测量的脉搏宽度是的电子横梁平版印刷术制作115μA和18ns，分别地为再结晶的测量最短的脉搏宽度是110ns，与1.5V的应用脉搏振幅。为有不同的线长度的线房间的集合和重设电流是坚定的。106的耐力与上面的电阻比率骑车800被完成了。

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简介：Windspeedscalinginsimilaritylawinwind-generatedwavesandthedragcoefficientarestudied.Inanalyzingthedatainthewindwavechannel,itisfoundthattheu.scalinggreatlyreducesthescatterintheU10scaling.Theu.scalinghasmuchlessscatterthanthescalingusingotherwindspeeds.Thefrictionvelocityseemstoplayadistinctiveroleinwavegrowth.Theresultisimportantintheapplicationsofthesimilaritylawandinwavemodeling.Intheoryitgivesaninsightintothemechanismofwindwaveinteraction.Itisfoundthatwavesteepnessisimportantininfluencingthedragcoefficient.Thevariabilityofthecoefficientsinthecurrentlywidelyuseddragformcanbeexplainedbythedifferencesinwavesteepnessintheobservations.Adragcoefficientmodelwithwindspeedandwavesteepnessasparametersisproposed.AnexplanationforKahma'sresultthattheu.scalingdoesnotreducethescatterintheU10scalingisgiven.

简介：Acouplingframeofspeedgainandmaintainwassuggestedtoassesstheflightperformanceofhypersoniccruisevehicles(HCV).Theoptimalcruisespeedwasobtainedbyanalyzingtheflightperformancemeasuredbytheratioofinitialboostmasstogeneralizedpayload.TheperformanceofHCVsbasedonrocketsandair-breathingramjetswasstudiedandcomparedtothatofaminimum-energyballistictrajectoryunderacertainflightdistance.Itisconcludedthatrocket-basedHCVsflyingattheoptimalspeedar...

简介：Thereexistmanymethodstomeasurebloodspeed,allofwhichhavesomeseriousshortcomings.Asfiberischaracterisedbytinydiameter,andlowlostratioofpowerandflexibility,itissuitableformeasuringbloodspeed.Itisprovedthatthespeedometerhashighspaceresolvingpower,hightimeresolvingpower,andoutstandingcapabilityofapproachingtarget,etc.

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