简介:Itisveryimportanttomeasurelocaldeformationsforanin-depthunderstandingofmechanicalpropertiesandfracturemechanismofstructuralandfunctionalmaterials.Inthispaper,differenttypesofmodelgridfabricationmethodsandmanytypesofelectronMoiremethodsusinganelectronbeamdrawingsystem,ascanningelectronmicroscopeorafocusionbeamarereported,togetherwiththeirapplicationsinthemeasurementofdeformationsoccurringinvariousengineeringsandmaterialsscienceresearch.
简介:Thebehaviorofargonplasmadrivenbynanosecondpulsedplasmainalow-pressureplasmareactorisinvestigatedusingaglobalmodel,andtheresultsarecomparedwiththeexperimentalmeasurements.ThetimeevolutionofplasmadensityandtheelectronenergyprobabilityfunctionarecalculatedbysolvingtheenergybalanceandBoltzmannequations.Duringandshortlyafterthedischargepulse,theelectronenergyprobabilityfunctioncanberepresentedbyabi-Maxwelliandistribution,indicatingtwoenergygroupsofelectrons.Accordingtotheeffectiveelectrontemperaturecalculation,wefindthattherearemorehigh-energyelectronsthatplayanimportantroleintheexcitationandionizationprocessesthanlow-energyelectrons.Theeffectiveelectrontemperatureisalsomeasuredviaopticalemissionspectroscopytoevaluatethesimulationmodel.Inthecomparison,thesimulationresultsarefoundtobeinagreementwiththemeasurements.Furthermore,variationsoftheeffectiveelectrontemperaturearepresentedversusotherdischargeparameters,suchaspulsewidthtime,pulserisetimeandgaspressure.
简介:Ta/MgO/NiFe/MgO/TaultrathinfilmswithandwithoutintercalationofNiFenanoparticlesinMgOlayerswerepreparedbymagnetronsputtering,followedbyavacuumannealingprocess.Themeasuredandcalculatedresultsshowthattheformerhashigherspecularelectronscattering(SES)parameteratMgO/NiFeinterfaces,lowerresistivity,andhighermagnetoresistance(MR).Theimprovedtransportproperties(TPs)aremainlyattributedtothesuppresseddiffuseelectronscatteringbymeansoftheintroductionofNiFenanoparticles.
简介:一系列电子施主包括1,1-cyclopentanecarboxylic酸diethyl酉旨(CPCADEE),1,1-cyclopentanedimethanol醋性的diester(CPDMAD),1,1-biethoxymethyl戊烷(BEMP),2,2-diethyldiethylmalonate(DEDEM)和2,2-diethyl-1,3-propanediol醋性的diester(DEPDADE),被diethylmalonate(DEM)综合。上述产品的纯净和结构被煤气的层析(GC)和煤气的层析团分光计(GCMS)分别地描绘。而且,这些施主的可能的最佳的三维的结构借助于Gaussian03和Chem3D被模仿。然后,这些电子施主与tetrachloro钛(TiCl4)和氯化物镁(MgCl2)被协调为丙烯的聚合获得催化剂。当CPCADEE或DEPDADE被用作内部施主(标志)时,聚丙烯的催化活动和性质被增加外部施主(编辑)极大地改进。然而,当BEMP被用作标志时,没有增加编辑,最高催化的活动被获得,它能减少生产费用并且简化催化合成。实验显示BEMP有氧原子和最高的electronegativity的最短的距离。
简介:Theadditivityruleforelectron-moleculescatteringisrevisedbyconsideringthedifferencebetweenthefreeatomandtheboundatominthemolecule.Thetotalcrosssectionsforelectronscatteringfromfluoromethanes(CF4,CF3H,CF2H2,andCFH3)arecalculatedinanenergyrangefrom100eVto1500eVbytherevisedadditivityrule.Thepresentcalculationsarecomparedwiththeoriginaladditivityruleresultsandtheavailableexperimentaldata.Betteragreementwitheachotherisobtained.
简介:Theenergydepositionforlow-energyelectronbeamonSi-SiO2modelswascalculatedbyMonte-Carlomethod.Makinguseofelectronparamagneticresonance(EPR)technique,aninvestigationoftheeffectofdopanttypeandconcentrationonEPRsignalvariationswascarriedoutbyusingp-typeandn-typesilicon(111)waferswithconcentrationof1×1015cm3and1×1017cm3,andthechangesofintensityofdefectparamagneticcentersbeforeandafterirradiationofelectronswerecompared.Thechemicalstatesof...
简介:Thelocalthermalconductivityofpolycrystallinealuminumnitride(AlN)ceramicsismeasuredandimagedbyusingascanningthermalmicroscope(SThM)andcomplementaryscanningelectronmicroscope(SEM)basedtechniquesatroomtemperature.ThequantitativethermalconductivityfortheAlNsampleisgainedbyusingaSThMwithaspatialresolutionofsub-micrometerscalethroughusingthe3ωmethod.Athermalconductivityof308W/m·Kwithingrainscorrespondingtothatofhigh-puritysinglecrystalAlNisobtained.Theslightdifferencesinthermalconductionbetweentheadjacentgrainsarefoundtoresultfromcrystallographicmisorientations,asdemonstratedintheelectronbackscattereddiffraction.Amuchlowerthermalconductivityatthegrainboundaryisduetoimpuritiesanddefectsenrichedinthesesites,asindicatedbyenergydispersiveX-rayspectroscopy.
简介:Thisworkinvestigatesinternalplasmaprocessparametersusingahairpinresonanceprobeandopticalemissionspectroscopy.ThedependenceofelectrondensityandatomicfluorineonthepercentageofoxygeninanSF6/O2dischargewasmeasuredusingthesemethods.AnRIEOxfordInstruments80pluschamberwasusedfortheexperiments.Twodifferentprocesspowers(100Wand300W)ataconstantpressure(100mTorr)wereused,anditwasfoundthattheopticalemissionintensityofthe703.7nmand685.6nmlinesofatomicfluorineincreasedrapidlyasoxygenwasaddedtotheSF6discharge,reachedtheirmaximumatanO2fractionof20%andthendecreasedwithfurtheradditionofoxygen.TheplasmaelectrondensitywasalsostronglyinfluencedbytheadditionofO2.