简介：Moleculardynamicssimulationswereperformedtostudytheinteractionbetweenatomichydrogenandsiliconcarbide.Inthepresentstudy,wefocusontheeffectofthesurfacetemperatureonHinteractingwithsiliconcarbide.ThesimulationresultsshowthattheretentionofHatomsinthesampledecreaseslinearlywithincreasingsurfacetemperature.ThedepthprofileanalysisshowsthatthesampleismodifiedbyHbombardment,andthedensityofHatomsisgreaterthanthoseofSiandCatomsneartheinterfaceregionbetweentheH-containingregionandthebulk.However,nearthesurfaceregionthedensitiesofH,SiandCatomsarealmostequivalent.Inthemodifiedlayer,thebondsconsistofSi-CandSi-HandC-H.ThefractionofSi-Cbondsisthegreatest.OnlyafewC-Hbondsarepresent.

简介：Geepilayersofdifferentthicknessesaregrownbymolecular-beamepitaxywithSbasasurfactantonSI(100)substrates,X-raydiffractionillustratesthattheseGethinfilmsarepartiallystrained.andthestrainsdecreasegraduallywithincreasingepilayerthickness,RamanspectrarevealadownwardshiftoftheGe-Gemodepeakastheepilayerthicknessincreases.Intheregionsofhighstrain,therelationshipbetweentheRamanshiftofthismodeandthestraininthepartiallyrelaxedsamplesisconsiderablydifferentfromthelinearrelationshipreportedbefore,whichismainlyattributedtothespatialconfinementeffectofphononsinananocrystal.

简介：本文利用XAFS方法研究机械合金化方法制备的Fe100-xCux(x=0,10,20,40,60,70,80,100,x为原子百分比）合金中Fe、Cu原子的局域环境结构随组成的变化。对于Fe100-xCux二元混合物，当x≥40时，Fe原子的近邻配位结构从bcc转变为fcc，但Cu原子的近邻结构保持其fcc不变；与之相反，当x≤20时，Fe原子的近邻配位保持bcc结构而Cu原子的近邻配位结构从fcc转变为bcc结构。XAFS结果还表明fcc结构的Fe100-xCux中Fe的无序因子σ（0．009A）比bcc结构的Fe100-xCux中的σ（0．081A）大得多；并且在同一机械合金化Fe100-xCux（x≥40）样品中Fe原子的σ（0．099A）比Cu原子的σ（0．089A）大。这表明机械合金化的Fe100-xCux样品中Fe和Cu原子可以有相同的局域结构环境但不是均匀的过饱和固溶体，而是fcc或bcc合金相同时存在Fe富集区和Cu富集区。

简介：Alargediamondcrystalupto500μmindiameterwithasmooth(100)facetatitstophasbeensynthesizedonMosubstratethroughmicrowaveplasmachemicalvapordeposition(MPCVD).Itsmorphologyandqualitywerecharacterizedbyscanningelectronmicroscopy(SEM),andthegrowthmechanismwasroughlyillustratedfrombothmacroscopicandmicroscopicviewpoints.Itwasfoundthatmorphologicalinstabilitiesareamajorfactorresultinginsynthesisoflargediamondcrystals,moreover,highmicrowavepowerdensity(MPD),highCH4concentrations,highpressure,highsubstratesurfacetemperatureandtheadditionofasmallamountofO2werealsonecessaryforthesynthesisoflargediamondcrystals.

简介：Neutralbeaminjection(NBI)isrecognizedasoneofthemosteffectivemeansforplasmaheating.A100slongpulseneutralbeamwith30keVbeamenergy,10Abeamcurrentanda100slongpulsemodulatingneutralbeamwith50keVbeamenergy,16AbeamcurrentwereachievedintheEASTneutralbeaminjectoronthetest-stand.ThepreliminaryresultssuggestthatEAST-NBIsysteminitiallypossesstheabilityoflongpulsebeamextraction.

简介：StationarylongpulseplasmaofhighelectrontemperaturewasproducedonEASTforthefirsttimethroughanintegratedcontrolofplasmashape,divertorheatflux,particleexhaust,wallconditioning,impuritymanagement,andthecouplingofmultipleheatingandcurrentdrivepower.Adischargewithalowersinglenulldivertorconfigurationwasmaintainedfor103sataplasmacurrentof0.4MA,q95≈7.0,apeakelectrontemperatureof>4.5keV,andacentraldensityne（0）2.5×1019m-3.Theplasmacurrentwasnearlynon-inductive(Vloop<0.05V,poloidalbeta0.9)drivenbyacombinationof0.6MWlowerhybridwaveat2.45GHz,1.4MWlowerhybridwaveat4.6GHz,0.5MWelectroncyclotronheatingat140GHz,and0.4MWmodulatedneutraldeuteriumbeaminjectedat60kV.Thisprogressdemonstratedstrongsynergyofelectroncyclotronandlowerhybridelectronheating,currentdrive,andenergyconfinementofstationaryplasmaonEAST.Itfurtherintroducedanexampleofintegrated'hybrid'operatingscenarioofinteresttoITERandCFETR.

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简介：GaInP/GaAs/Getriple-junctionsolarcellswereirradiatedwith50keVand100keVprotonsatfluencesof5×1010cm-2,1×1011cm-2,1×1012cm-2,and1×1013cm-2.Theirperformancedegradationisanalyzedusingcurrent-voltagecharacteristicsandspectralresponsemeasurements,andthenthechangesinIsc,Voc,Pmaxandthespectralresponseofthecellsareobservedasfunctionsofprotonirradiationfluenceandenergy.Theresultsshowthatthespectralresponseofthetopcelldegradesmoresignificantlythanthatofthemiddlecell,and100keVproton-induceddegradationratesofIsc,VocandPmaxarelargercomparedwith50keVprotonirradiation.