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32 个结果
  • 简介:Oxygenisotopefractionationbetweencoexistingmineralsinslowlycooledrocksconveysinformationabouttheircoolinghistory.Byusingthefastgrainboundary(FGB)modeltosimulateclosed-systemdiffusiveexchangeofoxygenisotopesbetweencoexistingminerals,Ishowthattheapparentequilibriumtemperatures(Tae)bythemineralpairwiththelargestisotopicfractionation(PLIF)alwaysliesbetweentheclosuretemperatures(Tc)ofthosetwominerals.Therefore,whentherateofoxygendiffusionandhenceTcforthePLIFchancetobecomparable(suchasinthecaseofquartzandmagnetite),TaewillserveasagoodapproximationofTcregardlessofvariationinmineralproportions.ThespecialtyofthePLIFinconstrainingTaewithintheirTcrangecanbegeneralizedtootherstableisotopesystemsandelementpartitioning.ByapproximatingTcwithTaeandinvertingDodson'sequation,thecoolingrateofplutonicormetamorphicrockscanbeinferred.

  • 标签: 氧同位素分馏 封闭温度 平衡温度 表观 共生矿物 冷却速率
  • 简介:<正>Polyhalite(K2SO4·MgSO4·2CaSO4·2H2O)isoneoftheinsolublepotassiummineralwhichiswidelydistributedinsulfate-typepotassium-bearingdeposit,andthetheoreticalconcentrationofK2SO4is28%.Itcanbedirectlyusedasa

  • 标签: POLYHALITE potassium-rich BRINE LEACHING calcium CHLORIDE
  • 简介:消费者们对容易腐烂的食物的质量给予越来越多的注意,它被存储温度主要影响。这份报纸在温度控制下面为容易腐烂的食物论述一个动态定价模型。为了最大化全部的利润,最佳的价格和存储,温度用Pontryagins最大的原则被获得。一个静态的定价模型被提供与动态的作比较。它被动态政策能比静态的使更多的收入成为的一个数字例子显示出。而且,经理的含意被分析,建议方法的有效性被表明。

  • 标签: 易腐食品 温度控制 动态定价 储存温度 定价模式 最大值原理
  • 简介:影响司烧混合的层温度变化上的飘移被考虑Stokes飘移在混合的层温度并且用的方程导致的一个移流的热运输学期估计海洋并且从一个全球海洋发行量模型(HYCOM)和一个波浪的波浪参数当模特儿(波浪手表III)。维的分析和量的评价方法被进行估计Stokes飘移导致的效果的重要性并且分析它的空间分发和季节的变化特征。到在mid-to-high纬度的混合的层温度变化的Stokes飘移的贡献与吝啬的水流的是可比较的结果表演,和混合的层温度变化的实质的部分被考虑Stokes飘移效果导致。尽管Stokes飘移导致的移流热运输不是为混合的层温度方程的领先的术语,它不能被忽视并且甚至为upperocean温度的模拟在一些区域变得批评。

  • 标签: 温度变化 海洋环流 数值估算 上层 定量预测方法 季节变化特征
  • 简介:Inthisstudy,weexaminedtheeffectofelevatedtemperatureontheexpressionpatternsofgenes,i.e.,nacrein,irr,n16,n19,andhsp70inthepearloysterPinctadafucata.Theexperimentwascarriedoutat4temperatures,i.e.,20℃(ambient,control),24,28℃,and32℃.TheexpressionlevelsoftargetgenesinP.fucatawereassayedat0,6,24,48,and96hviareal-timepolymerasechainreaction.Resultsshowedthattheexpressionlevelsofnacreinandirrhadnosignificantvariationsamongdifferenttimepointsbelow28℃,butsignificantlyincreasedovertimeat32℃.Theexpressionlevelsofn16andn19didnotchangemarkedlyat20℃.Theformerincreasedsignificantlyat6hand24hwhilethelattersubstantiallydecreasedduring6–96hat24,28and32℃.Amongdifferenttemperatures,thelevelofn16wassignificantlylowerat20℃thanatothertemperaturesduring6–96h,andthelevelofn19significantlyvariedamongdifferenttemperaturesat48hand96h.Theexpressionlevelofhsp70wassignificantlyhigherat32℃thanat20,24and28℃at24h.TheseresultsdemonstratedthatelevatedtemperatureimpactedthephysiologicalprocessesofP.fucataandpotentiallyinfluenceditsadaptabilitytothermalstress.

  • 标签: 合浦珠母贝 基因表达 温度 热休克蛋白70 聚合酶链反应 HSP70
  • 简介:一个模型(贝叶斯的海洋的前面察觉,BOFD)海表面温度(SST)在卫星的前面察觉--导出的SST图象基于阀值间隔被介绍,在象气候、环境的研究或渔业那样的不同应用程序被过去常。模型首先由使用一个Sobel算法模板计算SST坡度。根据坡度价值,阀值间隔被一个坡度决定累积直方图。根据这阀值间隔,前面候选人能被获得,优先的概率和可能性的能是计算的。候选人是否是前面点,能被使用贝叶斯的决定理论决定。模型在自台湾东面的菲律宾海流向日本的暖流前面区域的部分的先进很高分辨率的辐射计图象上被评估。结果与使用方法在文学建议了的几SST前面察觉获得的那些相比。这比较证明BOFD不仅压制噪音和小规模的前面,而且保留连续前面。

  • 标签: 检测模型 时间间隔 海面温度 阈值 贝叶斯决策理论 甚高分辨率
  • 简介:Acousticfatiguelifeevaluationisessentialforthermalprotectionstructuresduetotheseverethermo-acousticloadinservice.AstudyontemperaturedependenceofacousticfatiguelifeforaC/SiCpanelispresentedinthispaper.EffectsoftemperatureonboththestructuralresponsesandtheS–Ncurvesareinvestigated.TheDirlikmethodisadoptedtopredictthefatiguelifeofaC/SiCpanelatthreedifferenttemperaturesrespectively.Significantdifferencesareobservedfromtheresultsofnumericalsimulationsbetweenthefatiguelivesofthepanelinthethreecases.Thetemperature-dependenceofacousticfatiguelifeofaC/SiCpanelisverified,andfatiguetestofthematerialneedstobemoreattentivelyperformed.

  • 标签: 温度依赖性 疲劳寿命 保护结构 SIC纤维 热防护结构 寿命评价
  • 简介:黄桃树蛾,Conogethespunctiferalis(Guenée),multivoltine种是的过冬diapausing幼虫,是在中国的玉米上的最严肃的昆虫害虫之一。幼虫的diapause上的光周期和温度的效果在实验实验室条件下面被检验。短天的处理在25°C引起了幼虫的diapause,并且批评光周期在12和13h之间(或12h51min)每天轻。没有敏感中间形态为在下面感应的diapause被识别突然轮流出现--(L : D11 : 13h)并且长天(L : D14 : 10h)在不同幼虫的舞台的处理。然而,三中间形态的积聚的处理和在短天的处理下面的10d为50%幼虫的diapause的正式就职被要求。而不到3%那么在30°C做了,所有幼虫在20°C进入了diapause,不管长天或短天的处理。在短天的处理下面,而且,超过90%幼虫带着温度≤去了进diapause25°C,但是不到17%那么在28°C做了。在长天的处理下面,相反,不到19%幼虫带着温度≥去了进diapause23°C。在长天的政体下面的批评温度的前面的移动(5°C)在diapause正式就职上表明了温度和光周期的补偿效果。在结论,C。punctiferalis让一个温度依赖者打字我photoperiodicdiapause反应;短天的周期和暴露的中间形态的数字两个都为diapause决心,而是photoperiodic累积时间反措施没有敏感中间形态,并且photoperiodicdiapause反应,是补偿温度的现象。

  • 标签: 滞育诱导 临界温度 桃蛀螟 光照 螟蛾科 鳞翅目
  • 简介:Amongthecomponentsonamany-corechip,network-on-chip(NoC)hasalreadycontributedalargeportiontooverallpowerconsumption.OptimizingNoCperformanceunderagivenpowerbudgetisfurthercomplicatedtokeepthenetworkconnectivityandminimizethedetourdistances.Inthispaper,aNoCpowerbudgetingmethodfromthecommunicationperspectiveisproposed,whichintelligentlypowersoffrouters/linksandsetsupalternativepathstorestrictthepowerandthermalenvelop.Theeffectofperformanceoptimizaionoftheproposedpowerbudgetingmothodismeasuredbasedonlatencyandinthegivenpowerbudget,22%latencycanbereducedaveragelycomparedwithsomecompetingmethodswhenrunningrealbenchmarks.

  • 标签: 功率预算 功耗 通信 温度 片上网络 网络性能
  • 简介:Melt-spunribbonswhicharetheimportantrawmaterialforhot-deformedmagnetscanbepreparedbysingle-rollermelt-spinning.Inordertopreparewell-structuredribbons,themodeloftemperaturefieldforsingle-rollermelt-spinningprocesswasconstructedinthiswork.Theheatconductioninthisprocesswassimplifiedasonedimensionalheatconductionproblem.Itwasshownbymodelingthat,thetemperaturefieldinthemelt-spinningbeforesolidificationinthismodelcouldbedescribedasthisequationT(x,t)=Tmoexp[–k(x–x0)–k2αt]+T0.ThetemperatureT(x,t)ofthealloymeltsdecreasedwithincreasedpositionxandcoolingtimetexponentiallyfromthewheel-freesurfacetothewheel-sidesurface.TheconstantkdeterminedthedecreasespeedofalloytemperatureT(x,t),whichwasproportionaltotheinterfacialheattransfercoefficienthandtheinterfacialareaofheatconductionA0,butinverselyproportionaltothethermalconductivityK.x0wasthethicknessofthealloymelt.Withincreasedx0,thetemperaturedifferencebetweenwheel-freesurfaceandthewheel-sidesurfacebecamelarger,whichwouldleadtolargerdifferenceingrainsize.Inexperiments,theinfluenceofmelt-spinningprocessparametersonthetemperaturefieldmodelwasdiscussed,suchascoolingrollermaterials,wheelspeed,andsoon.Melt-spunribbonspreparedbysingle-rollermeltspinningatdifferentwheelspeedwereinvestigatedandmagneticpropertiesofdie-upsetmagnetsfrommelt-spunribbonsondifferentcoolingrollerwereanalyzed.Thevariationofgrainsizeinthedepthdirectionconsistedwithtemperaturefieldmodel.Thismodelprovideddirectionsforthepreparationofmelt-spunribbonswithuniformlydistributedfinegrains,whichwereverynecessaryforproducinghot-deformedmagnetswithhighmagneticperformance.

  • 标签: 温度场模型 制备工艺 钕铁硼粉末 熔纺 车轮速度 热传导问题
  • 简介:TakingTi-6Al-4Vspecimensintoconsideration,thecoupledthermal-electricalfiniteelementmodelhasbeendevelopedinAbaqus/ExplicittosimulatetheheatingprocessinGleeble3800andtostudythetemperaturehistoryanddistributioninthespecimen.Inordertoverifythefiniteelement(FE)results,thermaltestsarecarriedoutonGleeble3800foraTi-6Al-4Vspecimenwithaslottointhecentreofthespecimen.Theeffectsofthespecimensize,heatingrate,andairconvectiononthetemperaturedistributionoverthespecimenhavebeeninvestigated.Theconclusionscanbedrawnas:thetemperaturegradientofthespecimendecreasesasthespecimensize,heatingrate,andvacuumingdecrease.

  • 标签: 温度分布 成型条件 TI-6AL-4V 试样温度 有限元模型 测试
  • 简介:Combustioncharacteristicsofmethanejetflamesinanindustrialburnerworkinginhightemperaturecombustionregimewereinvestigatedexperimentallyandnumericallytoclarifytheeffectsofswirlinghightemperatureaironcombustion.Speziale-Sarkar-Gatski(SSG)Reynoldsstressmodel,Eddy-DissipationModel(EDM),DiscreteOrdinatesMethod(DTM)combinedwithWeighted-Sum-of-GreyGasesModel(WSGG)wereemployedforthenumericalsimulation.BothThermal-NOandPrompt-NOmechanismwereconsideredtoevaluatetheNOformation.Temperaturedistribution,NOemissionsbyexperimentandcomputationinswirlingandnon-swirlingpatternsshowcombustioncharacteristicsofmethanejetflamesaretotallydifferent.Non-swirlinghightemperatureairmadehighNOformationwhilesignificantNOprohibitionwereachievedbyswirlinghightemperatureair.Furthermore,velocityfields,dimensionlessmajorspeciesmolefractiondistributionsandThermal-NOmolarreactionrateprofilesbycomputationinterpretaninnerexhaustgasrecirculationformedinthecombustionzoneinswirlingcase.

  • 标签: 高温空气燃烧 NO生成 燃烧特性 旋流式 甲烷 雷诺应力模型
  • 简介:basedonoptimaldesignonthecoreelementofthesensor,awirelessandpassivesurfaceacousticwave(SAW)temperaturesensorintegratedwithIDTagwaspresented.Areflectivedelayline,whichconsistsofatransducerandeightreflectorsonYZLiNbO3substrate.Wasfabricatedasthesensorelement,inwhich,threereflectorswereusedfortemperaturesensing,andtheotherfivewerefortheIDTagusingphaseencoding.Singlephaseunidirectionaltransducers(SPUDTs)andshortedgratingwereusedtostructurethesAWdevice,leadingtoexcellentsignaltonoiseratio(SNR).TheperformanceoftheSAWdevicewassimulatedbythecouplingofmodes(COM)priortofabrication.Usingthenetworkanalyzer,theresponseintimedomainofthefabricated434MHzSAWsensorwascharacterized,themeasuredS11agreeswellwiththesimulatedone,sharpreflectionpeaks,highsignal/noise,andlowspuriousnoisebetweenthereflectionpeakswereobserved.UsingtheradarsystembasedonFSCWasthereaderunit.thedevelopedSAWtemperaturesensorswereevaluatedwirelessly.Excellent1inearityandgoodresolutionof士1℃wereobserved.

  • 标签: 温度传感器 表面声波 反射器 延迟线 无线 无源