简介：Throughphysicalmodelingandnumericalsimulation,theflowfieldinaslabcontinuouscastingmoldwithelectromagneticstirringismeasuredunderdifferentcastingparametersandstirringcurrents.Toqualitativelyevaluatetheflowfieldinthemold,twoindexes,i.e.,moldfluxentrapmentandvelocityuniformity,areproposed.Basedonthesetwoindexes,someoptimizedstirringparametersunderdifferentcastingconditionscanbedetermined.

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：ThephysicalandchemicalpropertiesandsoundnessofBaosteelPowerPlant’sdrydesulphurizedflyashweresystematicallyinvestigatedandcomparedwiththoseofthesimilarbyproductsproducedbysomeotherdomesticpowerplants.Thefeasibilityofthesebyproductsusedasaconstructionmaterialwasalsoanalyzed.TheresultsshowthatBaosteel’sdrydesulphurizedflyashisakindofashwithhighcalciumandhighsulfurcontents,whichhasthecharacteristicsofvolcanicashactivity.Itcontainssulfateandsulfite,andiseasytocausesulfateactivation.Ithashigheractivitycomparedwithcommonflyash.Buthighercalciumsulfiteandfree-CaOcontentsinashwillbringaboutsoundnessconcernstousers.Therefore,qualitytestsandvolumecontrolwillbenecessarywhenflyashisusedasaconstructionmaterial.

简介：Byusingsurfaceeffects（Augerelectronspectroscopy,X-rayphotoelectronspectroscopy,polarKerreffect）andvolumeeffects（magnetization,torquecurve）thephysicalprocessofsurfaceoxidationofrareearth-transitionmetalamorphousmagneto-opticalthinfilmswasstudiedinthispaper.Therareearthelementsoxidizepreferentiallyandrichatthefilmsurface,andthetransitionmetalsdepleteinoxidationlayer.Fe2O3inthesurfaceoxidationlayercontributestotheplanarmagnetization,andtherebytheanomalouspeakappearsnear180°onthetorquecurvesandtheamplitudeofthepeaksisrelatedtothedepthofsurfaceoxidationlayers.Theironbondstooxygeneasierthanthecobolt.RE-Comagneto-optiealthinfilmshavegoodpropertiesofresistancetooxidationandhumidity.