简介:Puretungsten(PW)andW-1wt%La2O3(WL10)werepreparedbypowdermetallurgicalroutefollowedbytheswaging+rollingprocess.Thelogarithmicstrainsare0,0.37,0.58,and0.98forWL10and0,0.58forPW.Heattreatmentswereperformedattemperaturesvariedfrom1,573to2,173Ktodeterminetherecrystallizationtemperature.Recrystallizationtemperaturesare1,973and2,173KforWL1(logarithmicstrainof0.37)andWL3(logarithmicstrainof0.98),respectively.ButinthecaseofWL2(logarithmicstrainof0.58),fullrecrystallizationisnotachievedattemperatureofabove2,173K.Furthermore,therecrystallizationtemperatureofPWwithlogarithmicstrainof0.58isatleast300KlowerthanthatoftheequivalentWL10sample.Moreover,theincreaseofrecrystallizationtemperatureinhibitsthestrengthdegradationofWL2:sampleslose4%and22%strengthwhenannealedat1,573and1,973Kcomparedwithroomtemperature(RT)sample.Finally,thetextureevolutionfortheswaged+rolledWL10issignificantlyrelatedtothedeformationdegree:thedominatedorientationis<001>forWL2while<110>forWL3.
简介:Weconsideronesourceofdecoherenceforaquantumcomputercomposedofmanytrappedionsduetothethermaleffectsofthesysteminthepresenceoflaser-ioninteraction.Theupperlimitofthetemperatureatwhichthelogicalgateoperationscouldbecarriedoutreliablyisgiven,andourresultisagreementwiththeexperiment.
简介:BasedonNCEP/CFSR0.5°reanalysisdataandthebesttrackdatafromtheJapanTokyoTyphoonCenter,compositeandcomparativeanalysesdemonstratetheasymmetricalstructuresofthetemperatureandhumidityintropicalcyclonesovertheWesternNorthPacificandtheSouthChinaSeafrom1979to2010.Theresultsareshownasfollows.(1)Withintensifyingtropicalcyclones,theflowfieldtendstobecomegraduallymoreaxisymmetric;however,theasymmetryofthespecifichumidityintheouterregionsismoreobvious.(2)Ingeneral,tropicalcycloneshaveanon-uniform,vertical,'doublewarm-core'structure.The'warm-cores'inthelowerlevelofweaktropicalcyclonesandinthehigherlevelofstrongtropicalcyclonesarethestrongerofthetwo.(3)Thedistributionareaofa'warm-core'isenhancedwithcycloneintensificationandtendstobecomemoreaxisymmetric.At200hPa,the'warm-core'ofaweakcyclonehasaweakanticycloneinthecenter,whereasthatofastrongcyclonehasaweakcycloneinthecenter.(4)The'wet-core'ofatropicalcycloneisprimarilylocatedinthelowerlevel(700-850hPa).Withthecyclone’sintensification,theintensityofthe'wet-core'increasesandthescopeofthe0.8gkg-1specifichumidityanomalytendstoexpandtohigherlevels.(5)Withthecyclone’sdeepening,thepseudo-equivalentpotentialtemperatureatdifferentlevelsindifferentregionsincreases.Inaddition,thelargestwarmingratesateachintensitylevelinthedifferentregionsoccurinthecorearea,followedinturnbytheenvelopeandouterareas.
简介:Theviscosityoffivebitumenswasmeasuredatdifferenttemperaturesandtheviscosity-temperaturerelationshipwasdevelopedtoevaluatethetemperaturesusceptibilityofdifferentbitumens.Thegenericfractions(ie,saturates,aromatics,resinsandasphaltenes)ofthebitumenswereseparatedandtestedbythin-layerchromatographywithflameionizationdetection(TLC-FID)andtheeffectofchemicalcompositionsontemperaturesusceptibilityofbitumenswasanalyzedusingthelinearregressionmethod.Theexperimentalresultsshowthatthefourgenericfractionsplayaninconsistentroleinthetemperaturesusceptibilityofbitumensandthecorrelationdegreeofeachfractionissomewhatdifferent.Theexistenceofaromaticsandasphaltenescanlowerthesensitivitytotemperaturechangeswhereassaturatesandresinsmayhaveanadverseimpactonthetemperaturesusceptibilityofbitumens.Asforthecorrelationdegrees,resinsshowtheclosestcorrelationwiththetemperaturesusceptibilityofbitumens,thenasphaltenesandaromatics,andthecorrelationbetweentemperaturesusceptibilityandsaturatesisrelativelyweak.
简介:Inthispaper,theresponseoftheatmospheric3-5yearcycletoNorthernPacificSSTisdiscussed,Theresultsareasfollows:1.FromthesimultaneoustemporalcorrelationsbetweentheEquatorialEasternPacificSST,thewesterlydirftarea’sSSTandtheNorthernPacificSSTatallgridpoints,wefindthattherearethreecorrelativeregionsintheNorthernPacificSSTfield,theyarethewesterlydriftarea,theEquatorialEasternPacificandtheAlaskaBay,andtheirstructuresareverysimilartothePNApatternintheatmosphereThedifferencePTIbetweentheEquatorialEasternPacificSSTanomalyandthewesterlydriftarea’sSSTanomalycanindicatethechangeofthePNApatternoftheNorthernPacificSSTanomaly.ItcanrepresentSSTchangeof65%areasovertheNorthernPacificandcankeepwatchonElNinoandun-ElNino.2.SimultaneoustemporalcorrelativefieldbetweenPTIandfiltered500hPa(thereis3-5yearcycleonly)oftheNorthernHemispherepresentsclearPNAstructure.Theresp
简介:Athree-dimensionalsimulationmodelfortheplasma-MIGweldingprocess,whichtakestheinteractionbetweentheplasmaarcandMIGarcintoaccount,ispresentedandthequasi-steadytemperaturefieldsontheworkpiecearecalculatedwiththemodel.The10mm-5A06aluminumalloyisweldedandthetemperaturefieldsaremeasuredwiththethermoelectriccouple.Thesimulationresultsandmeasuredresultsshowthatthebiggestdeviationofpeaktemperaturebetweenthemisbelow20℃,whichindicatesgoodcoincidencebetweenthesimulationandmeasurement.
简介:DetailedanalysisontransientcharacteristicsofECLcircuitsareperformedinthispaper,thenarelativelyexactpropagationdelayexpressionappliedforalltemperaturesispresented.Thecryogeniccharacteristicsofsomedominantparameterscontributedtopropagationdelayarealsodiscussed.Themodelachievedissuitableforoptimumdesignsofhighspeeddevicesandcircuitsatalltemperatures.
简介:统计downscaling的二条途径在19602008期间在夏天在北京车站基于每日的最大、最小的温度观察的百分位数被用于温度极端的索引。一个人到过由起初使用文件结束分析和逐步的线性回归的下阶层的每天最大、最小的温度,然后计算极端的索引;其它到过直接下阶层由使用季节的大规模温度和geo潜在的高度记录的基于百分位数的索引。交叉验证结果证明后者途径比前者有更好的表演。然后,后者途径在北中国被用于48个气象学的车站。所有48个车站的交叉验证结果显示出在基于百分位数的索引和季节的大规模变量之间的靠近的关联。最后,在北中国的温度极端的索引的未来情形被把统计downscaling用于哈德利中心投射联合模型版本3(HadCM3)在代表性的集中小径下面的模拟4.5(RCP4.5)第五的情形联合了模型内部比较的工程(CMIP5)。结果证明每日的最大的温度的第90百分位数将在所有地s珀?珀由大约1.5talSe增加吗??
简介:一系列随机的共聚物(PCLA)被D,L减水乳酸(LA)和-caprolactone(CL)的戒指洞聚合与不同臼齿的比率综合。PCLA基于聚氨酯(PCLAU)被获得由有hexamethylenediisocyanate(HDI)的PCLA和polytetramethylene醚(PTMEG)扩大链。所有PCLAU超过98%与高形状固定性比率展出好形状记忆性质,在第一的超过82%的形状恢复比率骑车,91%在第二骑车。有更少的CL内容的PCLAU证明有更多的CL内容的更快的恢复速度和PCLAU显示出更高的形状恢复比率。扳机温度能被以CL调整LA的臼齿的比率在身体温度附近调节或控制。PCLAU有潜在的应用在植入生物医学的设备,特别为最低限度地侵略的可部署的设备。
简介:Onthebasisofthequantizationofmesoscopicbiologicalcellequivalentcircuit,westudiedthequantumfluctuationsofvoltageandcurrentofmesoscopicbiologicalcellequivalentcircuitasfinitetemperaturebyBogoliuovtransformation.Theresultshowsthatthequantumfluctuationsofvoltageandcurrentnotonlyrelatewiththeparametersofequivalentcircuit,temperature,butalsodecaywithtime.Thisresultmayhavesignificantvalueonthedesignandapplicationofthebio-electronicapparatus.
简介:Inrecentyearsperovskitesolarcellshaveattractedanincreasingscientificandtechnologicalinterestinthescientificcommunity.Itisimportanttoknowthatthetemperatureisoneofthefactorswhichhaveastrongeffectontheefficiencyofperovskitesolarcell.ThisstudycommunicatesatemperatureanalysisonthephotovoltaicparametersofCH_3NH_3PbI_3-basedperovskitesolarcellinabroadintervalfrom80to360K.Strongtemperature-dependentphotovoltaiceffectshavebeenobservedinthetypeofsolarcell,whichcouldbemainlyattributedtoCH_3NH_3PbI_3,showingaferroelectric-paraelectricphasetransitionatlowtemperature(T<160K).Anincreaseintemperatureovertheroomtemperaturedecreasedtheperovskitesolarcellperformanceandreduceditsefficiencyfrom16%to9%.Theinvestigationwithelectronicimpedancespectroscopyrevealsthatatlowtemperature(T<120K)thechargetransportlayerlimitsthedeviceperformance,whileathightemperature(T>200K),theinterfacialchargerecombinationbecomesthedominantfactor.
简介:Theprincipleofanewopticalfibertemperaturetransducerispresented,andingeniousdesignschemeofthistransducerisgiven.Becausetakingthespecialmodulationandratiomeasurement,thisnewtransducerhasprovidedwithhighcharacteristics:experimentaltransmittingdistanceis500m;measurementerror,inthemeasuredtemperaturerangeof0-250℃,,islessthan±0.5℃;powerconsumptionoftheprobeislessthan300μW.Finally,somepointsoftheexperimentaregiven.
简介:TheArrheniuslawimpliesthatreactionrateisacontinuousfunctionoftemperature.However,thesteadylaminarflameletmodel(SLFM)doesnotexplicitlygivethisfunctionalrelationship.ThepresentstudyaddressesthisrelationintheSLFM.Itisfoundthatreactionrateisnotcontinuousinthemixture-fractionspace.Asaresult,theSLFMisunabletopredictlocalextinctionandreignition.Furthermore,weusetheunstablebranchofthe"S-curve"tofillthegapbetweensteadyburningbranchandextinctio...
简介:Theaxialandradialconvectiveflow,temperaturefluctuationanddistributionintheHMCZsiliconmeltarestudiedtentatively.Theexperimentalresultsshowthattheaxialandradialconvectivespeeds,thetempera-turevariationandtheradialtemperaturegradient,paralleltomagneticfieldandnearmeltsurface,alldecrease,buttheaxisymmetryoftemperaturedistributionnolongerexistswhenthemagneticfieldisapplied.