简介:Themajoraimscombustionengineersallovertheworldarestrivingatareconservationofenergyandallevia-tionofenvironmentalpollution,forwhichthemonitoringandcontrolofthefurnaceprocessareofprimeimportancetoattainanoptimizedconditionofcombustion.Oxygencontentinfluegasisgenerallyusedasanindicatorofwhethertherightamountofcombustionairissupplied.However,itcannotdirectlyreflectthedegreeofperfectionofthecombustionprocesstakingplaceinthefurnace.OntheotherhandCOisaproductofchemicalreactionwhichdirectlyreflectsthe
简介:石墨和ZrB2–SiC的氧化行为修改了石墨合成在1×105Pa空气和0.2×105PaO2。氧化测试在一个感应的加热炉子被进行。这二材料的氧化跟随了线性率法律。在2100°C的石墨和C–ZrB2–SiC的坚定的半径损失率在1×105−2和1.05×10−2%/s>Pa空气,和3.23×10−2和2.21×10在0.2×105−2%/s>PaO2,分别地。ZrB2并且原文如此的加入显著地减少了石墨的氧化率因为在氧化期间在样品表面上形成的氧化物规模在减少暴露的表面区域帮助在下面底层。在有一样的氧的二不同气氛部分压力,石墨和C–ZrB2–SiC在0.2×105PaO2比在1×105Pa空气。氧化为石墨和C–ZrB2–SiC的控制率的步被建议分别地是通过边界层并且通过在氧化物规模的毛孔的氧的里面的散开。一个模型基于散开理论被建立在他们的氧化行为上讨论全部的煤气的压力的效果。
简介:Aquantumdynamiccalculationonafive-dimensionalO2/LiF(001)modelsystemisperformedusingthemulti-configurationtime-dependentHartreemethod.Theobtainedresultsshowthatthemechanismofrotationalanddiffractiveexcitationindetails:Comparisonwiththerotationalexcitedstate,theinitiallynon-rotationalstateisseentofavortheinelasticscatteringintherotationalexcitationprocess.Thesurfacecorrugationcandampthequantuminterferencesandproduceagreateramountofrotationalinelasticscatteringattheexpenseoftheelasticprocessintherotationalexcitationprocess.Thediffractionprocessandtheaverageenergytransferredintotherotationalanddiffractivemodearealsodiscussed.
简介:NOVELOXIDATIONOFHEXABENZYLHEXAAZA-ISOWURTZITANEBYMe2CHNO2/CuCl/Py/O2XiaoPeiGUAN;HongYAN;JianGuangSUN;YongZhongYU(ScholofChe?..
简介:TheeffectofthecoadsorptionofCOandO2ontheZiff-Gulari-BarshadsurfacecatalyticreactionsysteminstudiedbyMonteCarlosimulation.ThecoadsorptionofbothspeciesaddsanextrareactionsteptotheclassicalZiff-Gulari-Barshadmodel.Itisshownthatthesecond-orderphasetransitionfromthereactivestatetotheO-passivatedstateintheZiff-Gulari-Barshadmodeliseliminated,andtheproductionrateofCO2increaseslinearlyalongthefractionycoofCOingasphasewhenitislow,inagreementwithexperimentalresults.WealsofindthattheincreaseoftheprobabilityofthecoadsorptionleadstothedecreaseofthecriticalvalueofycoofthediscontinuousphasetransitiontotheCO-passivatedstate.
简介:Asasuccessiveworkofourpreviouspaper,^1theelectrontransfermatrixelement(Vrp)intheoxidationofthesimplifiedmodelmoleculeofα-aminocarbon-centeredradicalbyO2hasbeeninvestigatedwithabinitiocalculationatthelevelofUHF/6-31G**.Basedontheoptimizedgeometriesofthereactgantandtheion-paircomplexobtainedpreviously,thereactionheatandtheiunerreorganizationenergyhavebeenobtainedbyconstructingthepotentialenergycurvesofreactantandproductstatesconsideringthesolventeffectwiththeconductor-likescreeningmodel(COSMO).ThesolventreorganizationenergyhasbeenestimatedusingLippert-Matagarelationship.ThecalculatedresultsshowthatthevalueofVrpisseveraltimeslargerthanthatofRT,whichmeansthatthemodelreactionisanadiabaticone.Theoreticalinvestigationindicatesthatthesolventeffectonthedirectelectrontransfer(ET)processofoxidationofα-aminocarbon-centeredradicalbyoxygenisremarkable.
简介:StudyonMorphologyofSurfaceofLargeAreaYBCOThinFilmsonZr(Y)O2SubstrateWangRuikun(王瑞坤),SunLihong(孙丽虹),LiuHongfei(刘鸿飞)WangXiaopi?..
简介:Thisworkinvestigatesinternalplasmaprocessparametersusingahairpinresonanceprobeandopticalemissionspectroscopy.ThedependenceofelectrondensityandatomicfluorineonthepercentageofoxygeninanSF6/O2dischargewasmeasuredusingthesemethods.AnRIEOxfordInstruments80pluschamberwasusedfortheexperiments.Twodifferentprocesspowers(100Wand300W)ataconstantpressure(100mTorr)wereused,anditwasfoundthattheopticalemissionintensityofthe703.7nmand685.6nmlinesofatomicfluorineincreasedrapidlyasoxygenwasaddedtotheSF6discharge,reachedtheirmaximumatanO2fractionof20%andthendecreasedwithfurtheradditionofoxygen.TheplasmaelectrondensitywasalsostronglyinfluencedbytheadditionofO2.