学科分类
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425 个结果
  • 简介:Tomakeitpossibleforthethermalwavetheoryontemperatureoscillation(TO)effectsinlivingtissuestobefoundedonthesubstantialexperimentalbasis,aseriesoftypicaldecisiveexperimentsinvivoaswellasinartificiallysimulatingcostructionswerecarredout.COnclusionsobtainedincludingsomeotherscholarsanimalexperimentalresultsallgreatlysupportthethermalwaveviewpointqualitatively,Afewexperimentalfactsusednottobeeasilyunderstoodfromtheclassicalviewpointarealsowellreinterpreted.TherevealingonthethermalwavemechanismsofTOinlivingtissuesisabrandnewdiscoveryanddeepinsightintothisimportantthermophysiologicalphenomenon,Itmaypossiblypromotenewinvestigationsonthecorrespondingtopicsinthefieldofbioheattransferscience.

  • 标签: 生物细胞 热传输 热生理学
  • 简介:磁性的元素Fe,公司和Ni的线性热扩大(CLE)的系数用与MATLAB计算相结合的理论模型从试验性的信息被估计。模型参数能精确地被决定,并且估计的数据在对试验性的结果的好同意。便于评价,热扩大的理论被使用把CLE分开成它的无磁性、磁性的部件。对CLE的无磁性的贡献的计算基于MnBi/NdFeB混血儿的修改Grc性质结合的磁铁都逐渐地减少,当混合磁铁的密度几乎线性地改善时。在293-398的一个温度范围?K,混合磁铁的coercivity温度系数从0.59逐渐地改善?%比较。建模和频率与二低角落频率认为压力消除阀门是一个秒顺序系统是合理的试验性的结果表演。PID控制,死了的乐队赔偿控制和鷸?鷸??

  • 标签: 线性热膨胀系数 磁性元件 评估 模型参数 实验数据 MATLAB
  • 简介:我们基于它的eigenstates的分类在arbitary-length1D海森堡spin-1/2链调查热纠纷的一般性质。纠纷上的磁场和温度的影响是讨论的品质上,三个特征被介绍。结论为由两部组成、多国参加的纠纷成立,并且与Arnesen等数字地证明的结果一致。

  • 标签: 海森堡 自旋 热熵 热学
  • 简介:Basedonfullconsiderationofthewinterwheatbiologicalcharacters,anagrometeorologicalmodelofphysiologicalthermalindexofwinterwheatincludingvernalizationandphotoperiodresponseisestablished,inwhichtheinfluenceofdiurnalvariationoftemperature,effectivetemperatureanddaylengthonthedevelopmentofwinterwheatduringtheperiodfromemergencetoelongationarecomprehensivelyconsidered.ValidationofthemodelusingthedatatakenfromtheexperimentsofwheatecologyinChinashowsthatthemodelbehaveswellwithmeanerrorlessthan3days.

  • 标签: simulation model winter WHEAT DEVELOPMENT stage(DVS)
  • 简介:稀罕、危及的种类Ammopiptanthusmongolicus(格言)的人口Chengf。在瓷器干旱区域和中亚很快衰退了。有迫切需要保护这种,它在在整个西北的中国的干旱区域维持生物多样性是特别地重要的。由基于植物蒸发转移系数分析红外线的热图象(h在)和光合的参数,我们成为量、精确植物生长和A的健康地位诊断。mongolicus。用一个LI-COR6400光合作用系统,我们测量了网络光合的率(Pn),有气孔的传导力(Gs),和蒸发率(Tr)。在这域里获得的红外线的热图象被ENVI4.8软件处理计算植物题目的表面温度。我们发现植物蒸发转移A的系数。mongolicus在旧植物的顺序>幼苗>中间的植物。年轻、中间、旧的植物的衰退健康层次被划分成三个范畴:<0.4,0.40.7,并且>0.7。系数与Tr,Gs,和P显示他们能同时反映植物生长的状态的n,。由建立h在在回归模型Y的和光合的参数?=?a-blnx,我们能精确地诊断植物生长和植物健康条件的衰落。

  • 标签: 中国西北部 健康诊断 红外热成像技术 沙冬青 珍稀濒危植物 保护生物多样性
  • 简介:Bythe90°elasticlightscatteringinvestigationandfarfieldobservationintherangeof20-800℃,therelationbetweenbehavioroflightscatteringanomaliesandevolutionofnanodomainstructuresinlatticeofbariumsodiumniobate(Ba_2NaNb_5O_(15),BSN)crystalwasclarified.ThecorrelationbetweenanomaliesonthetemperaturecurvesoftheelasticlightscatteringintensityandtemperaturetransformationsofnanodomainswasstudiedbyX-rayandelectronmicroscopemethods.Phasetransitionnear500℃andmovementinfieldofscatteringlightcouldbeexplainedbyappearanceofanewincommensuratephase.

  • 标签: 热进化 钡元素 铌酸盐 结晶
  • 简介:Thermalstresscaninducebirefringenceinalasermedium,whichcancausedepolarizationofthelaser.Thedepolarizationeffectwillbeverysevereinahigh-average-powerlaser.Becausethedepolarizationwillmakethefrequencydoublingefficiencydecline,itshouldbecompensated.Inthispaper,thethermalcharacteristicsoftwokindsofmaterialsareanalyzedinrespectoftemperature,thermaldeformationandthermalstress.Thedepolarizationresultfromthermalstresswassimulated.Depolarizationonnon-uniformpumpingwasalsosimulated,andthecompensationmethodisdiscussed.

  • 标签: DEPOLARIZATION DEPOLARIZATION COMPENSATION THERMAL BIREFRINGENCE
  • 简介:在里面很多地球物理或planetological背景包括地球内部核心,从岩浆海洋结晶的一个硅酸盐披风,或包围可能在很多主神并且农神冰冷的satellitesa对流传热遇到的一种深水oceana状况的冰壳水晶的层在与它的melt的层的接触。允许在一个稳固的层的边界或两个融化/结冰是可能的在层影响传送对流的模式。我们这里学习热传送对流的发作在一粘滞球形的壳与动态地导致了它的边界在也或两个都融化/结冰。这被显示出无尺寸的数字P(为每条边界的)的价值上的每interfacepermeable或impermeabledepends的行为,它是融化/结冰的timescale在上的比率一粘滞松驰timescale。P的小价值对应于可渗透的边界条件,当P的大价值对应于透不过的边界条件时。当也边界描绘的数字P是足够小的时,线性稳定性分析预言半渗透的边界的重要效果:允许边界在也融化/结冰允许更大的规模的出现对流模式。当外部边界是可渗透的时,效果是特别地激烈的,自从1个模式仍然是的度甚至在薄球形的壳的情况中最不稳定。在有可渗透的内部、外部的边界的球形的壳的情况中,最不稳定的模式在稳固的壳的一个全球翻译在于,没有变丑。在有可渗透的外部边界的一个完整的范围的限制,这对应于最近为地球内部核心建议的对流翻译模式。作为可能的申请的另一个例子,我们在假定全球表面下的海洋的存在的恩塞勒达斯冰壳讨论热传送对流的盒子,并且发现融化/结冰能在冰壳在传送对流的模式上有重要效果。

  • 标签: 边界条件 热对流 薄球壳 凝固 线性稳定性分析 熔解
  • 简介:Inrecentyears,thepotentialofrenewablegreenenergysourceshasbeenextensivelystudied.Theproventechnologywhichisphotovoltaicsolarcellsstrictlydependsondaylightandproduceslow-efficiently.Toovercometherestrictions,onetechnologystudiedisthroughharvestingthethermalradiationenergywhichcanprovidea24-hourenergysource.Thecontinuityofenergysourcespromisesverygoodenergyconversionespeciallyformilitaryapplications.Thisarticlepresentsanewstructurethatcanharvesttheabundantthermalradiationenergyintousableenergyatthewavelengthof10μm.Arectangularstructurewithaperturbationslitwasdesignedtointegratewitharectifiercircuitforgreenenergyconversion.Theslittunneljunctionguidedtheelectromagneticfieldintoajunctionwheretheenergycouldbecollectedandconverted.Anenhancementfactorofapproximately110.6canbeachievedbyaperturbationslitlengthof1.0μm.Theresultsextractedfromtheproposeddesignpromiseabettercandidatetoovercomethedisadvantagesofphotovoltaicsolarcellsforenergyharvestingdevices.

  • 标签: Enhancement factor green energy harvesting RENEWABLE thermal radiation
  • 简介:photonic水晶的热性质有18个循环地分布式的核心的纤维(PCF)激光被使用完整向量的有限元素方法调查(女性)。结果证明18核心PCF与单个核心PCF和19核心PCF相比举办更有效的热分散建设。另外,有不同热负担的18核心PCF激光的温度分发被模仿。当热负担在近似对应于600W的抽的力量的80W/m上面时,结果证明核心温度接近近似拉1800K的价值的纤维,当当热负担在近似对应于110W的抽的力量的15W/m上面时,涂层温度接近大约550K的损坏价值时。因此冷却的纤维是必要的完成力量可伸缩。与另外的不同冷却系统相比,使计划凉下来的铜被发现是一个有效方法减少热效果。

  • 标签: 光子晶体光纤激光器 热分布 多核心 矢量有限元法 核心温度 冷却系统
  • 简介:Thepetrologicalresearchontheultra-highpressuremetamorphism(UHP)ofcollisionalorogenindicatesthattheupper-crustalrocksissubductedtodepthsexceeding100km,andreturnedtothesurfacerapidly.Inthisstudy,weinvestigatethethermalstructureofcollisionalorogenasaslabofcontinentallithospherebeingsubductedbeneathanoverridingwedgeofcontinentallithospherebythe2-Dfiniteelementmethod.Theadvectionheattransferduetotheaccretionoforogenicwedgeisconsidered.

  • 标签:
  • 简介:Amethodofmeasuringtheinteractionsinamultivariablecontrolsys-tem(MVCS)intimedomainisdefinedinthispaper.Anintelligentdecouplingcom-pensatorisdesignedintermsoftheconceptoffuzzycontrol,sothattheauto-tuningofcontrollers’parametersina2×2MVCScanbeturnedintothatoftwoindependentsingle-loopcontrolsystems(SLCS).Themethodpresentedinthepaperhassuccess-fullybeenusedinasimulationexperimentontheautomatictuningofacoordinatedcontrolsystem(CCS)inthedrum-boilerturbogeneratingunit(DBTU)andthesimu-lationresultsaxesatisfactory.

  • 标签: boiler-turbine COORDINATED CONTROL MULTIVARIABLE SYSTEM SELF-TUNING
  • 简介:OnthebasisofHamilton’sprincipleanddynamicversionofvonKàrmàn’sequations,thenonlinearvibrationandthermal-bucklingofauniformlyheatedisotropicannularplatewithacompletelyclampedouteredgeandafixedrigidmassalongtheinneredgearestudied.Byparametricperturbationandnumericaldifferentiation,thenonlinearresponseoftheplate-masssystemandthecriticaltemperatureinthemid-planeatwhichtheplateisinbuckledstateareobtained.Somemeaningfulcharacteristiccurvesanddatatablesaregiven.

  • 标签: plate-rigid MASS system nonlinear vibration thermal-buckling
  • 简介:ThemorphoussiliconfilmspreparedbyPECVDatsubstratetemperaturesof30℃havebeencrystallizedbyrapidthermalannealingmethod,thebudgetoftime-temperatureintheannealingprocessis600℃for120s,850℃for120s,and950℃for120s.Theresultsindicatethecrystallizationat850℃and950℃arebetterasshowninmicro-Ramanscatteringandscanningelectronicmicroscope.

  • 标签: 固相晶化 非晶硅 快速热退火 PECVD
  • 简介:Thermalshockresistantpropertiesofreactionsinteredbauxite-basedβ-Sialonbondedcorundumhavebeeninvestigated,andtheresultsarecomparedwiththoseofAl2O3basedcounterpart.Itisfoundtheyallhaveverygoodthermalshockresistance.Theirresidualstrengthratiosafteronethermalshockcycleat△T=1200℃and△T=1350℃are61%~73%and53%~65%respectively.Theircriticaltemperaturedifference(TSR)is600℃~800℃.TSRparametersarecalculatedbasedonthermalexpansion,modulusofelasticity,andfracturetoughnessdetermined.ThereasonsforimprovingTSRofthesecompositematerialsarediscussed.

  • 标签: 硅铝氧氮聚合材料 铁铝氧石 热冲击 金刚砂 耐火材料
  • 简介:Inthiswork,wesimulatenumericallythethermaleffectsinnitrogenatatmosphericpressurecausedbyanegativecoronaDCdischargeoflowcurrent.Amathematicalfunctionthatsimulatestheinjectionofthethermaltransferingasisproposed.Thesimulateddischargeisofanegativepointtoplanemasstype,withaninterelectrodedistanceof12mmandasymmetryabouttheaxisofdischarge.Thespatialandtemporalevolutionofneutralsisanalyzedbasedupontheequationsofcontinuity,momentumandenergyinacylindricalgeometry.Forthegeometryofthesystem,theFCT(fluxcorrectedtransport)procedurewasadopted.

  • 标签: 负电晕放电 数值模拟 热效应 几何形状 连续性方程