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简介：Theeffectofpromotercobaltandthesequencesofaddingcobaltandmolybdenumprecursorsontheperformanceofsulfur-resistantmethanationwereinvestigated.AllthesesampleswerepreparedbyimpregnationmethodandcharacterizedbyN2-adsorption,X-raydiffraction(XRD),temperature-programmedreduction(TPR)andlaserRamanspectroscopy(LRS).TheconversionsofCOforMo-Co/Al,Co-Mo/AlandCoMo/Alcatalystswere59.7%,54.3%and53.9%,respectively.Amongthesecatalysts,theMo-Co/AlcatalystpreparedstepwiselybyimpregnatingMoprecursorfirstlyshowedthebestcatalyticperformance.Meanwhile,theconversionsofCOwere48.9%forMo/Alcatalystand10.5%forCo/Alcatalyst.TheadditionofcobaltspeciescouldimprovethecatalyticactivityofMo/Alcatalyst.TheN2-adsorptionresultsshowedthatCo-Mo/Alcatalysthadthesmallestspecificsurfaceareaamongthesecatalysts.CoMoO4speciesinCoMo/AlcatalystweredetectedwithXRD,TPRandLRS.Moreover,crystalMoS2whichwasreportedtobelessactivethanamorphousMoS2wasfoundinbothCo-Mo/AlandCoMo/Alcatalysts.Mo-Co/Alcatalystshowedthebestcatalyticperformanceasithadanappropriatesurfacestructure,i.e.,nocrystalMoS2andverylittleCoMoO4species.

简介：Inthispaper,wepresenttheluminescentpropertiesofTm3+∕Ho3+co-dopednewglass.Aseriesofsilicategermanateglasswaspreparedbytheconventionalmelt-quenchingmethod.IntheTm3+∕Ho3+co-dopedsilicategermanateglass,astrongemissionof2μmoriginatingfromtheHo3+:5I7→5I8transitioncanbeobservedunderconventional808nmpumping.Thecharacteristictemperatures,structure,andabsorptionspectrahavebeenmeasured.TheradiativepropertiesofHo3+inthepreparedglasswerecalculated.TheemissioncrosssectionofHo3+ionstransitioncanreach4.78×10-21cm2around2μm,andtheFWHMisashighas153nm.TheenergytransferefficiencybetweenHo3+andTm3+hasalargevalue（52%）,whichindicatestheTm3+∕Ho3+co-dopedsilicategermanateglassisasuitablecandidateforthe2μmlaser.Moreover,theenergytransfermechanismbetweenTm3+andHo3+ionswasinvestigated.

简介：WeproposeanddemonstrateawidelytunablepassivelyQ-switchedHo^3+∕Pr^3+-codopedZrF4-BaF2-LaF3-AlF3-NaFfiberlaseroperatinginthe2.8μmmid-infrared(MIR)wavebandbasedonasingle-walledcarbonnanotube(SWCNT)saturableabsorber(SA).TheSWCNTshavediametersrangingfrom1.4to1.7nm.ThemodulationdepthandsaturationintensityoftheSWCNTSAmeasuredat2850nmare16.5%and1.66MW∕cm^2,respectively.StableQ-switchedpulseswiththeshortestpulsedurationof1.46μsandthemaximumpulseenergyof0.43μJareachievedatalaunchedpumppowerof445.6mW.ThecombineduseofabroadbandSWCNTSAandaplaneruledgratingensuresabroadcontinuouslytuningrangeof55.0nmfrom2837.6to2892.6nm.Theoutputpowers,emissionspectra,repetitionrates,andpulsedurationsatdifferenttuningwavelengthsarealsocharacterizedandanalyzed.OurresultsindicatethatSWCNTscanbeexcellentbroadbandSAsinthe3μmMIRregion.Totheauthor’sknowledge,thisisthefirstdemonstrationofawidelytunablecarbon-nanotubeenabledpassivelyQ-switchedfiberlaseroperatinginthe2.8μmMIRwaveband.

简介：奇异的“丘奇巷3号”现象是如何产生的呢？本文就此提出了看法。

简介：我们与J(PC)=0(++)在bar'状态上在酒吧(q)上学习Qq(Q)的群众，1(++)，1(+-)并且2(++)在chiral苏(3)夸克模型，在Q是重夸克(c或b)，q(q')是轻夸克(u，d或s)的地方。根据我们的数字结果，做解释是不可能的[在在酒吧上的酒吧(n)上的cn(c)](1++)并且[在在酒吧上的酒吧(n)上的cn(c)](2++)(n=u，d)分别地作为X(3872)和Y(3940)说。然而，它对在在在bar'系统上的工具条(q)上的bq(b)的lindthetetraquarks有趣。

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简介：全部的内部分区和(尖端)为~(12)在温度被计算直到6000KC~(16)O_2。用计算分区函数，我们生产ν_的线紧张~(12)的3乐队在几高温度的C~(16)O_2。结果证明计算的线紧张在在直到3000K的温度的HITRAN数据库的对那些的很好的同意，它在高温度为尖端和线紧张的计算提供强壮的支持。然后，计算被扩大推进高温度，和ν_的模仿的系列~(12)的3乐队在5000和6000K的C~(16)O_2被报导。

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简介：Inthepresentwork,theLEDchipwasirradiatedbyusing59.6MeVNionsinaterminalchamberoftheSector-focusedcyclotron(SFC)intheNationalLabortaryofHeavy-ionAcceleratorsinLanzhou.The63MeVNionspenetratedthroughagoldfoilandscatteredinalargearea.Theenergyofionwasreducedto59.6MeVafterscatteringofthegoldfoil.TheLEDwasprovidedbytheSemiconductorLightingCenterinInstituteofSemiconductorinBeijing.TheluminencesoftheLEDbefore/afterirradiationweretestedthroughaintegratingsphereinSemiconductorLightingCenterinInstituteofSemiconductorinBeijing.Theluminancewastestedunderacurrentof350mA.Fig.1showstherelationshipbetweentheluminencesandtheirradiationfluences.Theirradiationledto

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简介：Grapheneanditsderivativeshaveattractedtremendousresearchinterestbecauseoftheiruniquecompositionandphysicochemicalproperties[1??3].However,thepotentialbiologicaltoxicityofGQDshasbecomeahealthriskbecauseoftheirinherentchemicalcompositionandnanoscaleproperties[4].Zebrafish(Daniorerio)isoneofthemostpromisinginvivomodelsystemsfortoxicitystudies[5].

简介：TheprogressofresearchgoingoninGroupofEnergyMaterials(GEM),MaterialResearchCenter,in2014isinthefollowingthreeaspects.1.FacilitydevelopmentInordertopushforwardourstudyonfusionreactormaterials,weupgradedtheirradiationterminal(128#)ofthesectorfocusedcyclotron(SFC)atHIRFL,bydevelopinganewspecimenstagespecificforirradiationwithlow-fluencescatteredions.Sofartheterminaliscapableofirradiationtobothverylowfluences(106ions/cm2)andveryhighfluences(typically1016ions/cm2)forvariousmaterials.SpecimentemperaturecanbereadilycontrolledusingtheL-N2coolingstageorthethehigh-Tstage(upto600oC).Ourrecentinvestigationwithtransmissionelectronmicroscopy(TEM)ofthedefectsproducedbyhigh-energyNeionsinsteelspecimensprovidesaclearevidencethatdefectswereproduceduniformlyalongthedepthinthespecimen,indicatingthattheenergydegraderoftheterminalworkseffectivelytodispersetheionenergyinawiderange.AphotooftheterminaltogetherwithaSRIMestimateofdepthprofilesofdamageinan8%Crreducedactivationferritic/martensiticsteel(RAFMS)isshowninFig.1.

简介：利用50Co实验研究了国产LiF(Mg,Ti)-M热释光剂量片(TLD)的线性响应上限及重复性.结果表明,国产LiF(Mg,Ti)-M的线性响应上限在150～200Gy之间,超过线性上限后灵敏度下降.在剂量片线性响应范围内重复使用,灵敏度基本不变;超过线性上限后重复使用,灵敏度会增加.实验结果还表明,通过筛选可以使一组剂量片的响应一致性满足使用要求,而且不论后续使用中的辐照剂量是否在线性范围,它们的响应一致性均不会因多次使用而变差,因此可以采用成批使用的方法测量非线性区吸收剂量,以提高大剂量测量的准确度.