学科分类
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425 个结果
  • 简介:Thenon-isothermaldecompositionoflead2,4,6-trinitroresorcinatemonohydrate,Pb(TNR)·H2O,wasinvestigatedbymeansofTG-DTA,DSCandIR.Thethermaldecompositionmechanismandthedissociatedkineticswerealsoinvestigated.ThekineticparameterswereobtainedfromtheanalysisoftheDSCcurvesbyintegralanddifferentialmethods.ThemostprobablekineticmodelfunctionofthedehydrationreactionofPb(TNR)·H2Owassuggestedbythecomparisonofthekineticparameters.

  • 标签: 热分解动力学 2 4 6-三硝基间苯二酚 铅化合物 一水化物
  • 简介:Duetotheexistenceofthermaloffsets,globalsolarirradiancesmeasuredbypyranometersaresmallerthanactualvalues,anderrorsarelargerinthedaytime.Untilnow,thereisnouniversally-recognizedcorrectionmethodforthermaloffseterrors.Therefore,itisimperativetoidentifyaconvenientandeffectivecorrectionmethod.Fivecorrectionmethodswereevaluatedbasedonthedatameasuredfromafieldexperimentfrom23Januaryto15November,2011.Resultshaveshown:1)Temporalvariationcharacteristicsofthermaloffsetsinthefourtestedpyranometersareconsistent.2)Amongthefivemethods,non-dimensionalquantitymethodissuggestedforusetocorrectthermaloffsets,becauseitisconvenientandnomodificationofinstrumentsisrequired.Ifcollocatednetlongwaveradiationandwindspeeddataareavailableandtheiruncertaintiesaresmall,thehistoricalsolarradiationdatasetscanalsobecorrected.Andcorrectioneffectsbythemethodarebetter.

  • 标签: PYRANOMETER TBQ-2-B THERMAL OFFSETS solar RADIATIO
  • 简介:Athermalmodelofcrystalisestablished.Thetemperaturefielddifferentialequationofthediode-end-pumpedlasercrystalwithcircularcross-sectionandnewboundaryconditions,inwhichtheconvectionheattransferissupposedtoexistbetweenlasercrystalendsandair,isestablished.Theanalyticalexpressionsoftemperaturefield,thermaldistortionandadditionalopticalpathdifference(OPD)ofcrystalareobtained.Bynumericalcalculation,theinfluenceofheattransferonthethermaleffectsoflasercrystalNd:YAGisstudied.Resultsshowthatcrystal'sthermaleffects,includingtemperaturefield,thermaldistortion,OPDandthermalfocallength,areallweakenedastheheattransferthroughendsofcrystalisstrengthened.Thisconclusioncouldbeusedtocontrolthermaleffectsoflasercrystalandimprovelaserworkingstability.

  • 标签: 二极管端面泵浦 激光晶体 热效应 传热 解析表达式 附加光程差
  • 简介:Thermalplasmawasappliedforthetreatmentofcokewastewatersludgederivedfromthesteelindustryinordertoinvestigatethefeasibilityofthesafetreatmentandenergyrecoveryofthesludge.A30kWplasmatorchsystemwasappliedtostudythevitrificationandgasproductionofcokewastewatersludge.Toxicityleachingresultsindicatedthatthesludgetreatedviathethermalplasmaprocessconvertedintoavitrifiedslagwhichresistedtheleachingofheavymetals.CO2wasutilizedasworkinggastostudytheproductionandheatenergyofthesyngas.Theheatingvalueofthegasproductsbythermalplasmaachieved8.43kJ/L,indicatingthefurtherutilizationofthegasproducts.Consideringtheutilizationofthesyngasandrecoveryheatfromthegasproducts,theestimatedtreatmentcostofcokewastewatersludgeviaplasmatorchwasabout0.98CNY/kgsludgeintheexperiment.Bypreliminaryeconomicanalysis,thedehydrationcosttakesanimportantpartofthetotalsludgetreatmentcost.Thetreatmentcostofthecokewastewatersludgewith50wt.%moisturewascalculatedtobeabout1.45CNY/kgsludgedrybasis.Thetreatmentcostofthecokewastewatersludgecouldbeeffectivelycontrolledbydecreasingthewatercontentofthesludge.Thesefindingssuggestthataneconomicdewateringpretreatmentmethodcouldbecombinedtocutthetotaltreatmentcostinanactualtreatmentprocess.

  • 标签: 等离子体处理 废水污泥 焦化废水 火炬系统 热处理 气体生产
  • 简介:Recentstudiesindicatedthatexceptfortheland-seathermalcontrast,therealsoexistedtheland-landthermalcontrast.Thecompositeanalysisandt-testmethodareusedtofurtherstudythelocalthermalcontrastvariationovertheAsiancontinent,andtodiscusstheassociationofseasonalvariationoflandthermalstatewithcirculationoverEastAsia,theearlysummerandsummermonsoonactivity,andtheprecipitationanomalyinChinainthedecadalscale.Resultsshowthatthepositivemeridionaltemperatureanomalytransportsdownwardfromuppertroposphericlayersinmiddle-highlatitudesnorthof25°Ninthepositiveyears.Inthezonaldirection,theTibetanPlateauheatinginthesuccessivespringactsasaforcetoinfluencetheatmosphere,leadingtotherapidtemperaturewarmingovereasternChinesecontinent,whichcouldincreasetheland-seathermalcontrastwiththenegativeSSTA.Accordingly,themonsoonactivityinearlysummeroverEastAsianestablishesearlierandthesummermonsoonintensitybecomesstronger.Theearlysummerprecipitationismore-than-normalovertheYangtzeRiver,andthesummerprecipitationismore-than-normaloverthenorthChinaandthesouthwestChina.Thesituationiscontraryinthenegativeyears.

  • 标签: LAND-SEA THERMAL CONTRAST T-TEST method ASIAN
  • 简介:Becausethelargermetallicsurroundsareheatedbytheeddycurrent,whichisgeneratedbytheACcurrentflowingthroughtheACbusbarintheInternationalThermonuclearExperimentalReactor(ITER)poloidalfield(PF)convertersystem,shieldingoftheACbusbarisrequiredtodecreasethetemperatureriseofthesurroundstosatisfythedesignrequirement.ThreespecialtypesofACbusbarwithnaturalcooling,aircoolingandwatercoolingbusbarstructurehavebeenproposedandinvestigatedinthispaper.Foreachcoolingscheme,a3Dfinitemodelbasedontheproposedstructurehasbeendevelopedtoperformtheelectromagneticandthermalanalysistopredicttheiroperationbehavior.Comparingtheanalysisresultsofthethreedifferentcoolingpatterns,watercoolinghasmoreadvantagesthantheotherpatternsanditisselectedtobethethermaldissipationpatternfortheACbusbarofITERPFconverterunit.TheapproachtoqualifythesuitablecoolingschemeinthispapercanbeprovidedasareferenceonthethermaldissipationdesignofACbusbarintheconvertersystem.

  • 标签: 交流母线 散热设计 ITER PF 转换器 国际热核试验堆
  • 简介:在这个工作,SCSMEX数据被用来诊断并且比较本地陆地海热条件,与在1998的在夏季风的发作和开发上的西方的太平洋和西藏的高原的热强迫的可能的影响的讨论的焦点。结果显示出在热来源的分发之间的一种靠近的关系,陆地海形成对照。由于地面的堵住的效果,在有更多的明显的纵贯的陆地海对比的区域的热来源的主要最大的地区更显然是向南方的专门与海洋比那些定位了。加热的表面与在土地和海之间的明显的季节变异和差别被描绘。在西方的太平洋和夏季风的发作之间的关系在海面温度(SST)和潜伏的热的变化被反映。西藏的高原的影响机制在夏季风期间是不同的:它被在华南海季风期间的理智的加热并且由在印度季风期间的压缩潜伏的加热统治。

  • 标签: summer monsoon LAND-SEA CONTRAST TOPOGRAPHY THERMAL
  • 简介:Carboranebisphenolnovolacs(3and4)weresynthesizedinthepresenceofacidcatalystfromcarboranebisphenols(5and6)andformaldehyde.Furtherepoxidizationofcarboranebisphenolnovolacswithepichlorohydringavecarboranebisphenolepoxynovolacs(1and2).Themolecularweightandepoxyvalueofobtainedresinsweredeterminedusingthemolecularweightoftheirprecursors.Theepoxyvaluesof1and2were0.48and0.52respectively,higherthanthemaximumtheoreticalepoxyvalue(0.45)ofdifunctionalcarboranebisphenolepoxyresins.FTIRandNMRwereutilizedtocharacterize1and2.ThecuringbehaviorswerealsostudiedbyDSCandtheoptimizedcuringconditionswereobtained.TGAanalysisindicatedthatcarboranemoietycouldshielditsadjacentorganicstructuresagainstinitialdecomposition.Ontheotherhand,B―Honcarboranecagecouldreactwithoxygentoformathree-dimensionalnetworklinkedbyB―O―BandB―Cbonds,whichfurtherblockedthemovementofformedradicalsandthusthedegradationprocesswasinhibited.

  • 标签: CARBORANE Epoxy novolacs Thermal stability
  • 简介:Inthis,phasecompsitionandthermalexpansionbehaviourofCaOStabilisedrefractorieswerestudied,Specialattentionwaspaidtotheexpasionbehaviourofthreematerialswithdifferentphasecomposition,TheresearchresultsindicatedthattheexpansionbehaviourcouldbeimprovedbymodifyingthestabilizationofZrO2,whichthusleadstotheincreaseinthethermalshockresistanceandpossiblyeroionresistaceofas-obtainedCaOstabilisedZrOmaterial.

  • 标签: 热膨胀 相组成 二氧化锆 耐火材料 氧化钙
  • 简介:Thefailuremodeandadhesionofthermalbarriercoating(TBC)8YSZ(ZrO2+8%(w/w)Y2O3)depositedonNiCoCrAlTaYbondcoatbyatmosphericplasmasprayingwereinvestigated.Agroovedmodifiedthree-pointbendingspecimenthatcangenerateasingleinterfacecracktofacilitatethecontrolofcrackgrowthwasadoptedfortesting,whichwasconductedattheambienttemperatureof100°C.Themorphologyandcompositionoffracturedsurfaceswereexaminedbymeansofascanningelectronmicroscopy(SEM)andanenergydispersespectroscopy(EDS).ImagesandspectrumshowthatcracksareinitiatedandpropagatedexclusivelywithinYSZlayeradjacenttotop/bondcoatinterface.Theload-displacementcurvesobtainedexhibitsimilarshapesthatindicatetwodistinctstagesincrackinitiationandstablecrackgrowth.FiniteelementanalyseswereperformedtoextracttheadhesionstrengthoftheTBCs.Thedelaminationtoughnessoftheplasma-sprayed8YSZcoatingsat100°C,intermsofcriticalstrainenergyreleaserateGc,canbereliablyobtainedfromananalyticalsolution.

  • 标签: 界面裂纹 热障涂层 涂层系统 等离子喷涂技术 扫描电子显微镜 脱层
  • 简介:OnFebruary16,theceremonytocelebratethebuilding-upofMeizhouwanThermalPowerPlantwassolemnlyheldattheplantconstructionsiteinPutianCounty,FujianProvince.Thisplantisafirstwhollyforeign-fundedone,approvedbytheStateDevelopmentPlanningCommission.ThetotalinvestmentinM

  • 标签:
  • 简介:Thermaltransportinahighlyporousmetallicwire-wovenbulkKagome(WBK)isnumericallyandanalyticallymodeled.Basedontopologysimilarityanduponintroducinganelongationparameterinthermaltortuosity,anidealizedKagomewithnon-twistedstrutsisemployed.SpecialfocusisplaceduponquantifyingtheeffectoftopologicalanisotropyofWBKuponitseffectiveconductivityItisdemonstratedthattheeffectiveconductivityreduceslinearlyastheporosityincreases,andtheextentofthereductionissignificantlydependentontheorientationofWBK.ThegoverningphysicalmechanismofanisotropicthermatransportinWBKisfoundtobetheanisotropicthermaltortuositycausedbytheintrinsicanisotropictopologyofWBK.

  • 标签: 有效导热系数 夹芯板 各向异性 织造 拓扑结构 数值模拟
  • 简介:动态、数字的方法被用来热强迫讨论大气的反应到SST。结果表演为行星的规模系统,热强迫能快速激动的站的SST稳定的大气的平衡状态回答,它被明显的大规模电视连接摆动在东方西方和南方北方方向描绘。为摘要的规模系统,SST热强迫主要使大气的低频率的摆动激动。在SST之间的某基本关系和动态过程热强迫和大气的反应模式被揭示,一些新观点被介绍。

  • 标签: SST FIELDS thermal FORCING OSCILLATION LOW-FREQUENCY
  • 简介:Heterogeneousprecipitationmethodwasusedtopreparedsurfacecoatingonself-madeBaMgAl10O17:Euphosphor.Resultsillustratethatthecoatingfilmcanbesilicondioxideinamorphousstatewith50nminthickness.Photoluminescenceresultsindicatethatthecoatinglayerpresentsanobservableimprovedeffectontheenhancementofthermalstability.Whenbakedat600℃for1h,theluminanceofcoatedBAMkeepsat92%higherthanthatofuncoatedBAMby23%.ThisprotectiveeffectcanbeattributedtothehighcompactdegreeanduniformityofthisamorphousSiO2coatingfilmwhichisservedasadiffusionblocklayertoinbreakoxygenatom,thusreleasestheoxidationextentofEu2+effectively.

  • 标签: PDP BaMgAl10O17∶Eu THERMAL DEGRADATION THERMAL stability
  • 简介:我们在一个二地区的模型的框架从壳类型超新星残余(SNR)学习非热的光子排放。在这个模型,加速,逃跑和粒子(电子和质子)的随后的放射的地点分别地被划分成加速和逃跑地区。粒子分布由二个部件组成,一个人在加速地区内被生产,其它在逃跑地区。我们把这个模型用于为三SNR的观察multi-waveband光子系列能从这些SNR在这个模型和高精力的γ-rays被解释很好的二幼仔和一旧壳类型SNR和表演可以有hadronic起源。

  • 标签: 热光子 超星星 高能物理 物理研究