简介：Thispaperstudiestheretardationprocessforphotosensitizedoxidationof9,10-diphenylanthracene（9,10-DPA）inducedbyhypocrellinA（HA）asasensitizerinthepresenceofpraseodymiumion(Pr3+).ExperimentalresultshowsthatthepromptfluorescenceofHAcanbequenchedbyPr3+inmethanol.Measurementoffluorescencelifetimerevealsthatitremainsconstantwithincreasingcon-centrationofPr3+,thusastaticquenchingcharacterisindicated.ThethermallyinduceddelayedfluorescenceofHAcanalsobequenchedeffectivelybythePr3+-HAcomplex.Thedelayedfluorescencelifetimeisre-ducedfrom1744±50nsto700±50nsand500±50nsinthepresenceofoxygenandPr3+respectively,thusthequenchingofdelayedfluorescenceisofdynamiccharacter.Ascomparedwiththedoublereciprocalrela-tionshipofconcentrationbetweentheoxidationproductderivedfromsingletoxygenandthereactant,itshowsthatthePr3+-HAcomplexcanquenchnotonlytheexcitedtripletofHAbutalsothesingletoxygenandthereforethephotosensitizedoxidationof9,10-DPAisretardedefficiently.

简介：ＡｐｐｌｉｃａｔｉｏｎｏｆｔｈｅＥｕ３＋ＩｏｎｆｏｒＳｉｔｅＳｙｍｍｅｔｒｙＤｅｔｅｒｍｉｎａｔｉｏｎＢｉｎｎｅｍａｎｓＫ，Ｇｏｒｌｌｅｒ－ＷａｌｒａｎｄＣ(ＵｎｉｖｅｒｓｉｔｙｏｆＬｅｕｖｅｎ，ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙ，Ｃｏ?..

简介：

简介：Intensevisibleemissionsfromdysprosium（Dy3+）ionsdopedglassesbecameprospectivefordiversetechnologicalapplications.Inthispaper,physical,opticalandstructuralpropertiesofmagnesiumborateglassesdopedwithvariedconcentrationsofDy2O3wereexamined.Suchglassesweresynthesisedbymeltquenchingmethodandcharacterizedatroomtemperatureusingseveralanalyticaltechniques.Luminescenceandabsorptionspectra（inthevisibleregion）ofas-quenchedsampleswereusedtoevaluatethephysicalandopticalproperties.XRDpatternconfimstheamorphousstateofas-quenchedsamples.TheFouriertransforminfrared（FTIR）spectraofglassesrevealvariousbondingvibrationsassignedtodifferentfunctionalgroups.UV-vis-NIRspectradiscloseeightabsorptionbandsaccompaniedbyabandforhypersensitivetransitionpositionedat1260nm(6H15/2→6F11/2).ThevaluesofdirectandindirectopticalenergybandgapofthestudiedglassesaredecreasedwiththeincreaseofDy3+ioncontents.Thephotoluminescencespectraofallglassesundertheexcitationof380nmdisplaytwoprominentemissionbandscentredat497nm(4F9/2→6H15/2,blue)and587nm(4F9/2→6H13/2,green).Theachievedintenseluminescencefromtheproposedglasscompositionmaybebeneficialforsolidstatelaserapplications.

简介：AnovelsolidsolutionCe6MoO15wasachieved.Theirstructureandoxideionicconductivitywerestudied.BasedonCe6MoO15,rareearthelementsubstitutiononceriumsiteshowsthatallresultingoxidesenhancetheconductivityfurther,andhavehighoxide-ionconductivity,whichmaybeakindofpromisingmaterialforSOFCs.

简介：

简介：以便改进金属压路机的表演，Mo+Y2O3合金粉末由CO2激光为激光表面alloying处理在40Cr钢压路机底层的表面上一致地习惯于上衣，结果证明许多好后果在增加稀土元素氧化物Y2O3以后被获得。合金层的水晶谷物显著地被精制。水晶谷物的边界被加强。微观结构的一致性和密度被增加。坚硬和合金层的穿的抵抗更加被改进。合金层的原子价电子结构分析被固体和分子(EET)的实验电子理论做。计算结果证明Y应该在第一个阶段被混合，Fe应该在第十八个混合乐队。说明的分析结果稳固的答案的电子理论在alloying上显示出加强的效果层，它提高了契约并且证实了试验性的结果。

简介：Additionofrareearth（RE）suchasYinthesurfacelayerofgraycastironorNi-basedsuperalloybylasersutfacemeltingwascarriedoutusinga2kWCO2laser.FordeliveringtheelementYtothemetalsurfacedur-inglaserirradiation,severalmethodswereemployed.ItisfoundthatY-containingsurfacemodifiedlayercanhecontrollablyobtainedonsubstrates,agraycastironcanbelasersurface-modifiedwithCr+Al-Ypowderre-sultinginathinlayerofFe-Cr-Al-Yalloysuchas30Fe40Cr27Al3Y.

简介：

简介：CeO2nanoparticles(nano-CeO2p)wereaddedintolasercladdedNiCoCrAlYcoatingsonNi-basedsuperalloysubstratetoimprovethemicrostructureandproperties.Scanningelectronmicroscope(SEM),X-raydiffractometer(XRD),micro-hardnesstester,andheattreatmentfurnacewereemployedtoinvestigatetheirmorphologies,phases,micro-hardnessandthermalshockresistance,comparedwiththecoatingwithoutnanoparticlesadded.Theresultsshowedthatthemicrostructureandpropertiesofthecoatingswiththeaddition...

简介：OpticalabsorptionandemissionintensitiesofNd3+ioninKLu(WO4)2crystalwereinvestigated.BasedontheJudd-Offelttheory,wecalculatedthefollowingspectralparameters:phenomenologicalintensityparametersΩ2=5.567×10–20,Ω4=3.597×10–20,andΩ6=3.800×10–20cm2.Theradiativelifetimeoflevels4F3/2was182.58μs.Thefluorescencebranchingratioforthetransition4F3/2→4I11/2was46.98%.Inaddition,theradiativetransitionprobabilitiesAJ,J’,oscillatorstrengthsPJ,J’andthevaluesofinte...

简介：分光镜并且在钠fluoroborate(SFB)的Nd3+离子的荧光性质眼镜通过光吸收，排放和腐烂大小被准备并且描绘。精力水平分析用免费离子的Hamiltonian模型被执行。试验性的振荡器力量被测量记录的吸收山峰包含的区域决定因为1.0mol.%Nd3+-做了眼镜。Judd-Ofelt参数(2,4,6)被用来评估象放射的转变那样的激光特征参数概率(AR)，放射的腐烂时间(R)，荧光分叉比率(R)和刺激排放为4F3/2的剖面图(e)亚稳的状态。为Nd3+离子的不同集中的荧光系列被在514.5nmAr+离子激光使样品激动记录。

简介：TheNd3+3.2%(atomfraction):KGd(WO4)2crystalwasgrownbyKyropoulosmethod.TheabsorptionspectrumandfluorescencespectrumofNd3+:KGWcrystalweremeasured.Theabsorptioncrosssectionsat808nm(0.6799×10-20cm2)werecalculated,andtheoutputwavelengthoffluorescenceis1064and1351nm.Thediode-pumpedlaserwasoperatedbothinthefree-runningandpassivelyQ-switchedoperatingmodes.Themaximumlaseroutput(1064nm)is326mWwith62.7%slopeefficiencywheninputenergyis900mW.ThebeamqualityfactorM2≈1.1.Thegreenlightof532nmisobtainedinfrequencydoublingoperation.ThelaserispassivelyQ-switchedbyusingCr4+:LuAGassaturableabsorber.Thepulsewidthis170nsatrepetitivefrequencyof15kHZ.

简介：TheelectrodeprocessofY3+iononmolybdenumandnickelelectrodeshasbeenstudiedbycyclicvoltammetryandchronopotentiometryintheYCl3-NaCl-KClmelt.Theoverallchargetransferprocessisatwo-stepreaction:Y3++e=Y2+;Y2++2e=Y.YttriumreducedonthenickelelectrodecanformaseriesofNi-Yalloys.X-raydiffractionanalysiswasemployedtodeterminethealloycompositionsformedunderdifferentcon-ditions.

简介：

简介：Inordertostabilisetheoperationoftheblastfurnaceandtoraiseitsoperationefficiency,researchworksfortheapplicationofmicrowaveandlaserscanningtechnologiestothemeasurementhavebeenintensivelycarriedoutatChinaSteelCorporation(CSC).Tomonitortheburdenprofileduringtheoperation,amicrowaveburdenprofilemeasuringsystemwasdeveloped.Thesystemconsistsofaradarunit,asignalprocessingsystem,andadrivingdevicewhichiscapableofrotatingtheradartoscantheburdensurfaceinaspecifieddirection.Anitrogencoolingsystemwasdesignedtoprotectthemeasurementsystem.AprototypeburdenprofilemeterwassuccessfullytestedinNo.1blastfurnacein2008,andapermanentonewasinstalledatNo.3blastfurnace.ThesystemhasprovidedusefulinformationforadjustingthechargingsequenceinNo.3blastfurnace.Foranotherapplication,3-Dlaserscanningtechnologyisemployedtomonitortheblastfurnaceliningcondition.Tothisend,adataregistrationmethodhasbeendeveloped,throughwhichtwomeasuredrangeimagessensedatdifferentperiodandlocationscanbefittedintothesamecoordinatesystem.Inpractice,theerosionoftheblastfurnaceliningcanbeestimatedwhenthecurrentinnerprofileiscomparedwiththattakenbeforetheblow-inoperation.ThistechnologyisalsoadoptedtoevaluatetheperformanceofgunningoperationintheblastfurnacesatCSC.

简介：Thetransformationinducedplasticity(TRIP)steelseffectoccursbecauseofthemartensitictransformationofretainedausteniteduringplasticdeformation,anditprovidesthesteelwithexcellentstrengthandductility.Whileweldingremainsavitalpartofautobodymanufacturing,theweldabilityofTRIPsteelsisproblematic,andthispreventsitsadoptionformanyapplicationsintheautomotiveindustry.Thispresentworkstudiestheeffectsofweldingandpost-weldheattreatmentonthemicrostructureof...

简介：ThereactionofNdCl3withlithiummethylnaphthalenein1:2moleratioinTHFgeneratesblackpowder.Thepowderreactswithcyclooctatetraene（COT）inTHFtoformthetitlecomplex.[Li（THF）4Nd（C8H8）2]·2THFcrystallizesinthemonoclinicspacegroupP2/cwithunit-celldimensionsa=1.7858（7）nm,h=1.3243（4）nm,c=1.8086（6）nm.β=106.52（4）°,V=4.10nm3andDc=1.268g/cm3forZ=4.F（000）=1660,R=0.0774,Rn=0.0733.Thecomplexconsistsofdiscreteion-pairandtwoTHFmoleculesadduct.Intheanion,theneodymiumatomiscoordinatedbytwoCOTrings.ThestructureofthecationshowsthatthelithiumatomisattachedwithTHFmoleculesonly.

简介：高度取向附生、纯(001)面向的CeO2电影被激光在SrTiO3(001)底层上种没有任何气体的分子的横梁取向附生方法周围。CeO2的Layer-by-layer取向附生的生长模式被证实由在situ思考高精力的电子衍射(RHEED)观察。高分辨率的X光检查衍射(HRXRD)和高分辨率的传播电子显微镜学(HRTEM)结果显示了STO(100)//CeO2(100)，STO[100]//CeO2[110]为out-of-plane和在里面飞机的取向附生的关系分别地。取向附生的电影的形成机制也根据一个理论模型被讨论。LMBEceria电影的化学状态被评估并且证实因为Ce3+和氧空缺的存在被介绍。

简介：AdetailedstudyofthefluorescenceemissionpropertiesandenergytransfermechanisminEr3+/Tm3+co-dopedleadsilicateglasseswasreported.Enhancednearinfrared1.8μmandvisibleup-conversionemissionswereinvestigatedunder808and980nmexcitations,respectively.TheenergytransfermechanismbetweenEr3+andTm3+wasanalyzedaccordingtotheabsorptionspectra,theemissionspectraandthelevelstructuresofEr3+andTm3+.TheenergytransferefficiencybetweenEr3+andTm3+reached68.1%intheEr3+/Tm3+co-dopedleadsilicateglasseswhenpumpedby808nmlaserdiode.Basedontheabsorptionspectra,theJudd-Ofeltparameters,spontaneousemissionprobability,absorptionandemissioncrosssections,gaincoefficientswerecalculatedandanalyzed.Itwasfoundthatthecalculatedemissioncrosssectionandthemaximumgaincoefficientaround1.8μmwere4.9×10–21cm2and1.12cm–1,respectively.TheseresultsindicatedthattheEr3+/Tm3+co-dopedlead-silicateglasseshadpotentialapplicationinnearinfraredlasers.