简介:TheHL-2AisthefirstdivertortokamakinChina.ItsconstructionisbasedonthemaincomponentsofASDEXfromIPPandanentirelynewpowersupplysystemisrequiredtopoweritsmagneticfieldcoilsandtheplasmaheatingsystem.ThemostimportantelectricparametersofHL-2Aaretoroidalfieldof2.8kAwithaflattopT,plasmacurrentof450of5s.
简介:Therearemanyinneritemsinvacuumvessel,andhundredsofsealsonthevesselbortsintheHL-2Atokamak,soitisdifficulttogetexcellentvacuum.Duringtheengineeringtestin2002,theresultsofquadrupolemassspectrometershowedthatthepartialpressuresofoxygenandH2Owerehigherthannormalvalue,someleaksontheupperMP3coiljacketsandportsealshadbeendetected.Inordertocarryoutgooddischargeexperiment,thegoodvacuumandwallconditionmustbemaintained.
简介:OperationandDevelopmenton2MVTandemAccelerator¥WangXianyi;LiZhengfang;XuZhenkiia;HaoJunyuan;ZuKailing;XuHuang;LiHengyuanandHeJ...
简介:TheapproachofutilizingcombustionsynthesistomakefineparticlesofSiO2,Al2O3andTiO2isaquitemoderntechnology.Throughthechemicalreactioninpost-flameregion,fineSiO2particlescanbeformedwithhighpurityonplatesurface.Therefore,thecombustionsynthesisofSiO2powdersisanimportantareaforfurtherresearchanddevelopment,especiallyfortheapplicationofSiO2inthesemiconductorindustry.Thisinvestigationproposesanexperimentalapproach(i.e.,agas-phasecombustionsynthesis)usingtwodifferentkindsoforganiccompounds,Hexamethyldisilazane(HMDSA)andHexamethyldisioxane(HMDSO),asthesiliconprecursors.ApremixedgasburnerischosenwithC3H8asfuel,airasoxidantandpartoftheairwasusedasthecarryinggastoentrainHMDSA/HMDSOvaporintothecombustiblemixture.ObservationsshowthattheC3H8/airflamechangedcolorfromapale-blueflametolightyellowandthenorangewhendifferentamountsofprecursorswereintroduced.Throughthechemicalreactioninthepost-flameregion,fineSiO2particleswereformedinthegasphaseandthenquenchedandcollectedonanaluminumflatplate.TheobjectiveofthispaperistostudytheeffectsofHMDSOandHMDSAconcentrationsandflametemperaturesonthesynthesisofSiO2particles.
简介:InHL-2Aexperiments,thescreencapturesoftwareisdevelopedtogetthescreenimagesontheremotecomputers.TheimagescanbesavedintothecorrespondingdirectoryasBMPorJPGfiles.Beforethisprogramstarts,itisnecessarytodetectwhetherthenetworkisblockedornot.Ifthenetworkisokay,thesetupparametersforlasttimewillbeloadedin.Ifthetriggersignalarrives,thesystemstartsworkingaccordingtothegivensetup.Atthesametime,
简介:ThecapacitytocaptureCO2wasdeterminedinseveralstoichiometriccompositionsintheLi2O–Bi2O3system.Thecompounds(Li7BiO6,Li5BiO5,Li3BiO4andLiBiO2phases)weresynthesizedviasolid-statereactionandcharacterizedbyX-raydiffraction,scanningelectronmicroscopyandN2adsorptiontechniques.Thesampleswereheat-treatedattemperaturesfrom40to750°CundertheCO2atmospheretoevaluatethecarbonateformation,whichisindicativeofthecapacityofCO2capture.Moreover,Li7BiO6showsanexcellentCO2capturecapacityof7.1mmol/g,whichisconsiderablyhigherthanthoseofotherpreviouslyreportedceramics.Li7BiO6isabletoreactwithCO2from240°Ctoapproximately660°CshowingahighkineticreactionevenatCO2partialpressurevaluesaslowas0.05.
简介:AnewSnO_2-Fe_2O_3/SWCNTs(single-walledcarbonnanotubes)ternarynanocompositewasfirstsynthesizedbyafacilehydrothermalapproach.SnO_2andFe_2O_3nanoparticles(NPs)werehomogeneouslylocatedonthesurfaceofSWCNTs,asconfirmedbyX-raydiffraction(XRD),transmissionelectronmicroscope(TEM)andenergydispersiveX-rayspectroscopy(EDX).Duetothesynergisticeffectofdifferentcomponents,theassynthesizedSnO_2-Fe_2O_3/SWCNTscompositeasananodematerialforlithium-ionbatteriesexhibitedexcellentelectrochemicalperformancewithahighcapacityof692mAh·g~(-1)whichcouldbemaintainedafter50cyclesat200mA·g~(-1).Evenatahighrateof2000mA·g~(-1),thecapacitywasstillremainedat656mAh·g~(-1).
简介:Thispaperreportsonthelongevityofglycerol-dry(CO2)reformingoverthelanthanum(La)promotedNi/Al2O3catalysts.TheXRDresultsshowedthattheNiparticlewaswell-dispersedinthepresenceofLapromoter.Inaddition,viatheNH3-TPDanalysis,itwasfoundthattheLapromoterhasreducedtheacidityofNicatalystwhichmayhaveexplainedthemitigationofcarbonlaydown.Itwasdeterminedthatthe3.0wt%La-promotedNi/Al2O3catalystpossessedthelargestBETspecificsurfaceareaof97m2g-1.Consequently,ityieldedthebestcatalyticlongevityperformancewithconversionattainedmorethan90%,evenafter72hofreactionduration.Significantly,itcanbeconfirmedthatthepresenceofCO2duringtheglyceroldryreformingwasessentialinreducingcarbondeposition,mostlikelyviagasificationpathway.Thishasensuredastabilityofcatalyticactivityforalongreactionperiod(72h).
简介:WehavesynthesizedandinvestigatedphysicalpropertiesoftwonewquaternarycompoundsGd2CoAl4T2(T=Si,Ge)singlecrystals,whichareisostructuraltoTb2NiAl4Ge2andEr2CoAl4Ge2.Themostimportantstructuralfeatureofthesematerialsistheanti-CaF2-typeCoAl4T2slabs.Thesematerialsshowmetallicbehaviorbelow300Kandthereisalong-rangeantiferromagnetic(AFM)transitionappearingat20and27KforGdCoAl4Ge2andGd2CoAl4Si2,respectively.ResistivityandheatcapacitymeasurementsalsoconfirmthesebulkAFMtransitions.Furtheranalysisindicatesthatthislong-rangeantiferromagnetismshouldresultfromthemagneticinteractionbetweenlocalmomentsofGd^3+ions.
简介:AhighsensitivityD-shapedholedouble-claddingfibertemperaturesensorbasedonsurfaceplasmonresonance(SPR)isdesignedandinvestigatedbyafull-vectorfiniteelementmethod.WithintheD-shapedholedoublecladdingfiber,thehollowD-sectioniscoatedwithgoldfilmandtheninjectedinahighthermo-opticcoefficientliquidtorealizethehightemperaturesensitivityforthefiberSPRtemperaturesensor.ThenumericalsimulationresultsshowthatthepeakinglossoftheD-shapedholedouble-claddingfiberSPRishugelyinfluencedbythedistancebetweentheD-shapedholeandfibercoreandbythethicknessofthegoldfilm,butthetemperaturesensitivityisalmostinsensitivetotheaboveparameters.Whenthethermo-opticcoefficientis-2.8×10-4∕℃,thethicknessofthegoldfilmis47nm,andthedistancebetweentheD-shapedholeandfibercoreis5μm,thetemperaturesensitivityoftheD-shapedholefiberSPRsensorcanreachto-3.635nm∕℃.
简介:在这份报纸,我们在场一三维(3D)在为收音机频率的晶片水平的真空包装技术微机电的系统(RFMEMS)共鸣器,低损失的硅vias在被用来播送RF发信号。Au-Sn焊接结合被采用象电的导体一样提供真空封装。封装帽子的一个RF模型被建立评估包装的寄生效果,它提供3DRFMEMS封装的一个有效设计答案。与建议包装结构,24dB的signal-to-background比率(SBR)被完成,以及共鸣器的优秀因素(Q因素)在包装以后从8000~10400增加。包装共鸣器有线性频率温度(英尺)在在0楨?慰数?之间的一个温度范围特征?牵敶?牡?牰癯摩吗??
简介:Inthispaper,weproposeahighlyautomaticapproachfor3Dphotorealisticfacereconstructionfromasinglefrontalimage.Thekeypointofourworkistheimplementationofadaptivemanifoldlearningapproach.Beforehand,anactiveappearancemodel(AAM)istrainedforautomaticfeatureextractionandadaptivelocallylinearembedding(ALLE)algorithmisutilizedtoreducethedimensionalityofthe3Ddatabase.Then,givenaninputfrontalfaceimage,thecorrespondingweightsbetween3DsamplesandtheimagearesynthesizedadaptivelyaccordingtotheAAMselectedfacialfeatures.Finally,geometryreconstructionisachievedbylinearweightedcombinationofadaptivelyselectedsamples.Radialbasisfunction(RBF)isadoptedtomapfacialtexturefromthefrontalimagetothereconstructedfacegeometry.Thetextureofinvisibleregionsbetweenthefaceandtheearsisinterpolatedbysamplingfromthefrontalimage.Thisapproachhasseveraladvantages:(1)Onlyasinglefrontalfaceimageisneededforhighlyautomaticfacereconstruction;(2)Comparedwithformerworks,ourreconstructionapproachprovideshigheraccuracy;(3)ConstraintbasedRBFtexturemappingprovidesnaturalappearanceforreconstructedface.