简介：在低频率改正测量头相关的转移功能(HRTF)的一个方法被建议。由在低频率从球形的头模型分析HRTF，在400Hz的频率下面，HRTF的大小是将近不变的，阶段为远、近的地两个都是频率的线性功能，这被证明。因此，如果在400Hz上面的HRTF被实验精确地测量，它能由理论模型在低频率改正HRTF。计算和主观实验的结果证明建议方法的可行性。

简介：Recently,aSm-GdcompoundheatinsulationceramicsmaterialcontractandanapplicationproductresearchcontractonREnano-catalystincatalyticburningenergysavingandenvironmentalprotectionweresignedbyTsinghuaUniversity,BaotouResearchInstituteofREandBaotouJingruiAdvancedMaterialsCo.,Ltd.Sm-GdcompoundheatinsulationceramicmaterialtechnologytransferprojectreliesontheexistingtechnologyofTsinghuaUniversityandutilizesabundantSm-GdbyproductofBaotoutoproducehighperforman...

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简介：Thispaperreportsthekineticsofgrouptransferpolymerization(GTP)ofethylacrylate(EA)withzinciodidecatalystin1,2-dichloroethaneusingdimethylketenemethyltrimethylsilylacetal(MTS)asinitiatorat0℃andabove0℃.Theamountofcatalystusedwasstudied.Whenzinciodidecatalystusedismorethan10mol%relativetomonomer,therateofpolymerizationisproportionaltotheconcentrationofmonomer,whereaszinciodidecatalystusedislessthan10mol%ofthemonomer,therateofpolymerizationisindependentofthemonomerconcentration.IntheGTPofEAaninductionperiodwasobservedwhenthezinciodidecontentsarelessthanl0mol%.Ifthereactiontemperatureisover0℃,livingspeciesbecomeunstableanddiminish,leadingtoincompletemonomerconversion.Thereactioncurvesequationsareobtained.Thepolymershavenarrowmolecularweightdistributionswhicharenotchangedasdecreasingzinciodidecontents.Thepolydispersityisabout1.2.

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简介：Accordingto350MWand600MWboilers,underoxygenfuelcondition,throughthereasonablecontroloftheprimaryandsecondaryflowandthecorrectoptionandrevisionofmathematicalmodel,thetemperaturedistribution,heatfluxdistributionandabsorptionheatdistribution,etc.wasobtainedwhichcomparedwiththoseunderaircondition.Throughcalculation,itisobtainedthattheprimaryandsecondaryflowmixedwell,goodtangentiallyfiredcombustioninfurnacewasformed,thetemperatureunderairconditionobviouslyhigherthanthetemperatureunderO26condition.Theadiabaticflametemperatureofwetcyclewasslightlyhigherthanthatofdrycycle.Themaximumheatloadappearedonthewaterwallaroundtheburnerarea.Theheatloadgraduallydecreasedalongthefurnaceheightupanddowninburnerarea.TheheatabsorptioncapacityofthefurnaceunderO26waslowerthanthatundertheaircondition.Theheatabsorptioncapacityoftheplatenheatingsurfaceunder026wasequaltothatunderaircondition.AndtheheatabsorbingcapacityofwaterwallunderO26wasabout7%~12%lessthanthatunderaircondition.

简介：Hydrodynamicandthermalcharacteristicsinapipewithsinusoidalwavysurfaceforsteadylaminarflowareinvestigatednumericallyinthepresentstudy.TheintegralformsofgoverningequationsarediscretizedusingcontrolvolumebasedFinitevolumemethodwithcollocatedvariablearrangement.SIMPLEalgorithmisusedandTDMAsolverisappliedforsolutionofsystemofequations.Apipeoflengthequalto4λisconsidered.Effectofsurfacewaviness,determinedbywavelength-amplituderatioλ/a(=L^*),onflowandthermalfieldispresented.ThesimulationworkhasbeencarriedoutforL^*=11.0-30.0foraReynoldsnumberrange50to2000.Resultsarepresentedintheformofstreamfunction,isothermallines,velocityandvorticityprofiles,changeofmeanfrictionfactor,variationinskinfriction,localandaverageNusseltnumberwithReynoldsnumber,wavenumber(n)andL^*.Foraparticulargeometry,lengthofcirculationzoneincreaseswithreynoldsnumberandapproachesalimitingvalueforhigherReynoldsnumber.Wallshearstressinthebulgepartofthechannelshowssmallervaluesthataffectlargely.therateofheattransferandNusseltnumbershowsminimumvaluesinthisregion.Thiscirculationzonedrasticallyincreaseswiththeincreaseofsurfacewavinessshowinghighmeanfrictionfactorperwavelength.MeanfrictionfactorinverselyvarieswithReynoldsnumber.Acorrelationisproposedforcalculatingfrictionfactorintheformf=C/(Re)^m,where‘C’and‘m’representstwopolynomialsofdegree4and2respectivelyandarefunctionofL^*.Higherwavinessofthesurfaceshowsthehigherheattransferratethanlowerwaviness.Heattransferratefallsalmostexponentiallyalongtheaxialdirectionwiththeincreaseofwavenumber.

简介：Bioluminescenceimagingisakindofemergingdetectiontechnologyatcellular,molecularandgeneticlevel.Themostpopularbioluminescenceimagingmodelisdiffusionapproximation(DA).However,becauseoftheill-posednessoftheDA-basedinverseproblemandtheinstabilityofreconstructionalgorithms,thelocationaccuracyofthereconstructedsourcesislow.Radiativetransferequation(RTE),whichconsidersthedirectionofthephotonmigrationandtheeffectofabsorptionandscatteringintissues,canaccuratelyexpressthetransmissionofbioluminescentphotonsthroughthetissues.Inthispaper,westudiedthebioluminescenceimagingbasedontheRTE.2Dsimulationswereperformed,andquantitativeevaluationwasgivenbytheabsolutesourcepositionerror,therelativesourceareaerrorandtheminimumboundingbox.TheresultsoftheexperimentshowedthattheimagingqualitybasedonRTEwasbetterthanthatonebasedonDA.

简介：IntroductionReductivedesulfurizationofthioamidestoaminesisoneofthemethodstoprepareaminesandisgenerallyachievedbya)Zninacid,b)sodiumoraluminumamal-gams,c)lithiumalumminiumhydride,d)RaneyNiande)electrolyticreduction.Thesemethodsarenotveryconvenienttobeoperatedandsomeneedmorecomplexinstrument.Hereisreportedthereductivedesulfurizationofthioamidestoaminesbycatalytichydrogentransferreaction(CHT).

简介：Roboticgasmetalarcwelding(GMAW)experimentswereconductedusinganERTOS-1electrodewithAr+10%CO_2shieldinggas,andtheweldingcurrentandarcvoltagesignalswerecollectedbyadataacquisitionsystem.TheboundariesbetweenglobulartransferandspraytransferintermsoftheweldingcurrentandarcvoltageweredeterminedaccordingtothewaveformofelectricsignalsandtheFouriertransformresultsofarcvoltage.Theoptimumweldingparametersforthetwotransfermodeswereobtained,whichlaidafoundationforthenumericalsimulationandcontrolofGMAWprocess.

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简介：Theeffectofpressureoncombustionandheattransferisanalyzed.Theresearchisbasedonthebasiccombustionandheattransfertheorem.Acorrectionfortheheatcalculationmethodforpressurizedfurnaceismadeonthebasisofthenormalpressurecase.Thecorrectiontakestheeffectofpressurizingintoaccount.Theresultsshowthatthecorrectionisreasonableandthemethodisapplicabletocombustionandheattransferofthemarinesuperchargedboiler.

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简介：Thermodynamicsisabranchofphysicswhichdealswiththeenergyflowintosystems.Therearetwoprincipallawsofthermodynamicswhicharedescribedonseparateslides.Thefirstlawofthermodynamicsrelatestothetransferofvariousformsofenergy,asheat,electric,magneticandchemicalenergiestoproducemechanicalwork.Thislawissometimestakenasthedefinitionofinternalenergy,andintroducesanadditionalstatevariable,enthalpy.Thefirstlawofthermodynamicsallowsformanypossiblestatesofasystemtoexist.Butexperienceindicatesthatthereisonlyonedirectionfornaturalprocessestoproceed.Thisleadstothesecondlawofthermodynamicsandthedefinitionofanotherstatevariablecalledentropy.Thesecondlawstipulatesthatthetotalentropyofasystemplusitsenvironmentcannotdecrease;itcanremainconstantforareversibleprocessbutmustalwaysincreaseforirreversibleornaturalprocesses.However,thelimitednumberofauthorsisconcernedbysystemsthatinvolvethetransferofelectricandmagneticenergiesinadditiontotheflowofheatinstudyingageneralthermodynamicsystem.Thesubmittedreviewfollowsanentropyapproachthatintroducescleardefinitionsoftheelectricchargeandmagneticfluxtoclarifyambiguitiesofthenaturesofsuchfluxesinliterature.So,thefirstandsecondlawsofthermodynamicsareappliedonthermo-electromagneticprocessesthatembracetheflowofmechanical,thermal,electric,andmagneticenergiesintosystemsthatinvolvefluidsorsolids.Accordingly,itwaspossibletomodifyredundanciesintheSIsystemofunits.Followingtheentropyapproach,itwaspossibletocasttheMaxwell’sequationsintoanenergyframeofreferencetoexplainthediscoveredTesla’swirelesspowertransmissionas“ElectricalRadiantEnergy”,andtheMITdiscoveryofwirelesspowertransmissionofthemagneticfluxas“EvanescentWaves”andtoclarifyfuzzinessofthedualityconfusionbyspecifyingauniquepropertyfortheelectronasaparticleandaun

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简介：在这份报纸，陶器的蜂房改革者的热转移数字地基于计算液体动力学被模仿数字分析软件CFX5。改革者和气体的纵的温度分发被获得。有时间的温度的变化被讨论。另外，象打开时间，在改革者的入口的煤气的温度，改革者的高度和再生材料的特定的热那样的一些参数的效果加热浸透时间被讨论。它为再生热转移机制的进一步的学习提供了首先理论上的基础。关键词改革者-数字模拟-热浸透时间-高温度空气燃烧CLC数字TK124

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