简介：InspiteofthecurrentprevalenceoftheCVD-basedprocesses,theelectricarcremainsaninterestingprocessforthesynthesisofcarbonnanoforms,thankstoitsversatility,robustnessandeasiness.Italsoallowsperformingin-situsubstitutionofcarbonatomsbyhetero-elementsinthegraphenelattice.Ourworkaimstoestablishacorrelationbetweentheplasmaproperties,typeandchemicalcomposition(andthesubstitutionrate)oftheobtainedsingle-wallcarbonnanotubes.TheplasmawascharacterizedbyopticalemissionspectroscopyandtheproductswereanalyzedbyhighresolutiontransmissionelectronmicroscopyandcorelevelElectronEnergy-LossSpectroscopy(EELS).Resultsshowthatahighboroncontentleadstoaplasmatemperaturedecreaseandhinderstheformationofnanotubes.Thiseffectcanbecompensatedbyincreasingthearccurrentand/oryttriumcontent.Theoptimalconditionsforthesynthesisofboron-and/ornitrogen-substitutednanotubescorrespondtoahighaxialplasmatemperatureassociatedtoastrongradialgradient.EELSanalysisconfirmedthattheboronincorporatesintothegraphemelattice.

简介：本文通过对三聚氰胺(C3N6H6)的室温高压原位同步辐射能量散射x-ray衍射实验（EDXRD），在14．7GPa压力范围内，观察到常压下为单斜晶系的三聚氰胺经历了两次压致结构相变。在1．3GPa下，三聚氰胺分子晶体从单斜相转变为三斜相；在8．2GPa又转变为正交相。

简介：SpectroscopicmethodsareusedtoinvestigatecoordinationstructureofN-picolylpolyurethanetransitionmetalcomplexes(PUPYM,M=Co^2+andNi^2+).Geometricalarrangementofligandsinfirst-shellcoordinationsphereofmetalionsispostulatedtobetetrahedralCoL2Cl2andoctahedralNiL2-Cl2Z2.whereListhepicolylgroupandZisahydrate.FromextendedX-rayabsorptionfinestructure(EXAFS)analysis,bondlengthsformetal-chlorineandmetal-ligandofPUPYMaresimilartothoseofsmallmolecularweighttransitionmetalcomplexes.Atwo-phasemodelofPUPYMwhichbestdescribestheexperimentaldataofDMTAandSAXS.isproposed.Onemicrophaseistheharddomainofselfsegregatedhaedsegmentsbroughtaboutbymetal-ligandinteraction.andtheotherphaseisthematrixofsoftsegments.Transitionmetalion-ligandmoietiesandtheirinteractionsdominatethemacroscopicthermalbehaviorofPUPYM.Theligandfieldstabilizationenergydifference(ΔLFSE)betweenmteald-electronsincomplexeswithtwopicolylligandsinthecoordinationsphereofmetalionsandcomplexesmaintainingonepicolylligandascoordinationpendentgroupiscalculatedonthebasisofobservedcoordinationstructure,anditrepresentstheenergysuppliedtosplitcoordinationcross-links.ΔLFSEofpolyurethanenickel(II)complexislargerthanthatofthecobalt(II)complex,Sincethemobilityofhardsegmentsisininverseproportiontothestrengthofcoordinationcross-links.ahigherα-transitiontemperatureofPUPYNi^2+withrespecttoPUPYCo^2+isfoundasexpected.

简介：Surfacemodificationofpolypropylenemicroporousmembrane(PPMM)wasperformedbyatmosphericpressuredielectricbarrierdischargeplasmaimmobilizationofN,Ndimethylaminoethylmethacrylate(DMAEMA).Structuralandmorphologicalchangesonthemembranesurfacewerecharacterizedbyattenuatedtotalreflection-Fouriertransforminfraredspectroscopy(FT-IR/ATR),X-rayphotoelectronspectroscope(XPS)andfieldemissionscanningelectronmicroscopy(FE-SEM).Watercontactanglesofthemembranesurfaceswerealsomeasuredbythesessiledropmethod.Resultsrevealthatboththeplasma-treatingconditionsandtheadsorbedDMAEMAamounthaveremarkableeffectsontheimmobilizationdegreeofDMAEMA.Peroxidedeterminationby1,1-diphenyl-2-picrvlhydrazyl(DPPH)methodverifiestheexsistenceofradicalsinducedbyplasma,whichactivizetheimmobilizationreaction.PurewatercontactangleonthemembranesurfacedecreasedwiththeincreaseofDMAEMAimmobilizationdegree,whichindicatesanenhancedhydrophilicityforthemodifiedmembranes.Theeffectsofimmobilizationdegreesonpurewaterfluxeswerealsomeasured.Itisshownthatpurewaterfluxesfirstincreasedwithimmobilizationdegreeandthendecreased.Finally,permeationofbovineserumalbumin(BSA)andlysozymesolutionweremeasuredtoevaluatetheantifoulingpropertyoftheDMAEMA-modifiedmembranes,fromwhichitisshownthatbothhydrophilicityandelectrostaticrepulsionarebeneficialformembraneantifouling.

简介：Themicroscopiceffectivechargesinmirrornuclei51Mnand51Feareinvestigatedwiththeparticle-vibrationcouplingmodelbasedontheself-consistentSkyrme-Hartree-Fockandcontinuumrandom-phase-approximationapproaches.Theisovectorpartsarepredictedtobearound0.15,andtheprotoneffectivechargesarearound1.25e,whichislessthantheempiricalvalueofeeffp=1.5e.Themicroscopiceffectivechargesinneutronrich51Mnareabout10%lessthanitsprotonrichmirror.TheseeffectivechargesarecombinedwiththeshellmodeltocalculatethereducedelectricquadrupoletransitionprobabilityB(E2)valuesin51Mnand51Fe.ItturnsoutthatthemicroscopiceffectivechargeshavewellreproducedtheB(E2)valuesanditsratiointheterminatingstates.

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简介：Wehavedevelopedalargenumberofexocrineglandsonliquoriceleavesandfacilitatedpolysaccharidesecretion.Liquoricepolysaccharidepossessesstrongerboundwateraffinitytogaseouswatercomparedwithsucroseandglucose.Ourresultsshowthattheboundwateraffinityofliquoricepolysaccharidetogaseouswateris49.75%higherthanglucose(p<0.01).WithN~+implantation(totaldosageof4.68×10~(16)ions/cm~2andenergyof20keV)intodryliquoriceseeds,boththeboundwateraffinitytogaseouswaterandtheboundwatercontentofdryliquoriceleafcanbesignificantlyincreased30.24%(p<0.01)and36.51%(p<0.01)respectivelycomparedwiththesham-irradiatedseeds.Meanwhile,withtheseparameterschosenforN~+implantationintodryliquoriceseeds,theleafpolysaccharidecontentunderwaterstress(ψ_w=-1.5MPa)canincreasesignificantly(p<0.05)andtheplantgrowthcanalsoimprovesignificantly(p<0.05).

简介：Thezonalfieldseffectonthebeta-inducedAlfveneigenmode(BAE)destabilizedbytheenergeticparticlesintoroidalplasmasisstudiedthroughthegyrokineticparticlesimulations.ItisfoundthatthelocalizedzonalfieldswithanegativevaluearoundthemoderationalsurfacearegeneratedbythenonlinearBAE.Intheweaklydrivencase,thezonalfieldswithastronggeodesicacousticmode(GAM)componenthaveweakeffectsonthenonlinearBAEevolution.Inthestronglydrivencase,thezonalfieldsaredominatedbyamoresignificantzerofrequencycomponentandhavestrongereffectsonthenonlinearBAEevolution.

简介：本文利用同步辐射角分辨光电子谱研究了f.c.c.Fe与Cu{111}之间的界面。观察到了位于表面布里渊区中K点附近的界面态，表明它是一个有序的界面。垂直出射的价带谱表明外来Fe原子对衬底Cu{111}的能带结构无任何影响。这与互混的Co/Cu{111}的结果不同，表明界面处不存在Fe与Cu原子之间的互混。

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简介：对K3±δC60多晶薄膜进行了同步辐射光电子谱研究。入射光子能量为17－86cV。实验发现K3±δC60光电子谱的HOMO－1，HOMO及LUMO等导出能带的谱峰强度均随入射光子能量的增加而呈现振荡的性质，与纯C60的光电子谱峰随入射光子能量变化的趋势相似。结果C60分子独特的笼状几何结构，认为其电离截面的变化是由于K3±δC60的末态电子在C60分子笼内形成球状驻波引起的。以驻波的边界条件为基础进行理论计算，得到的电离截面极小值对应的光子能量与实验得到的结果符合良好。

简介：Thetransportprocessof12CionsinwaterwasstudiedwithSRIMcodeandGeant4toolkit.TheSRIMresultsindicatethatthetransversediffusionof12Cionbeamcausesdistortionofenergydepositalongthebeamdirection.Thedistortionbecomesmorenotableasthetrans-versediffusionincreases.ThesimulationresultsofGeant4indicatethattheinfluenceofsecondaryfragmentsonenergydepositdistributionwouldbethemainfactorcausingthedistortioninhigherenergyrange.Intheregionadjacenttothebeamlinewherethecontributionfrom12Cionsdomi-nates,thecontributionsfromsecondaryfragmentsareignorable.Thefurtherfromthebeamaxistheregionlocates,thelargerthecontributionsfromsecondaryfragments,untilthecontributionsfromsecondaryfragmentsareignorable.Thefurtherfromthebeamaxistheregionlocates,thelargerthecontributionsfromsecondaryfragments,untilthecontributionsfromsecondaryfrag-mentsexceedthatof12C.Amongallthesecondaryfragments,thecontributionsofH,HeandBionsaremostlynotable.Itisalsofoundthatsomepositron-emittingsecondaryfragmentscouldbeveryusefulforpositionemittingtomography(PET).

简介：利用角分辨紫外光电子谱对乙烯和乙炔气体在Ru(1010)表面的吸附及与K的共吸附的研究结果表明：当衬底温度超过200K，乙烯即发生脱氢反应，σCH和σCC能级均向高结合能方向移动。在室温下，σCH和σCC能级位置与乙炔在Ru(1010）表面的吸附时的分子能级完全一致。乙烯发生脱氢反应后的主要产物为乙炔。衬底温度从120K到室温，Ru(1010）表面上乙炔的σCH和σCC能级均未发现变化。室温下乙炔仍然可以在Ru(1010）表面以分子状态稳定吸附。在有K的Ru(1010）表面上，室温时σCC谱峰几乎。碱金属K的存在促进了乙炔的分解。

简介：根据K在C60晶体中的扩散系数分析了在C60（111）单晶解理面上制备K3C60单晶膜的实验条件。对制备出的样品进行了角分辨光电子谱研究。结果表明样品确实为K3C60单晶，并首次观察到K3C60的能带色散。

简介：BasedonthesinglebiasingelectrodeexperimentstooptimizetheconfinementofplasmainthedeviceofKT-5Ctokamak,dual-biasingelectrodeswereinsertedintotheKT5Cplasmaforthefirsttimetoexploretheenhancingeffectsofbiasingandthemechanismsofthebiasing.Bymeansofapplyingdifferentcombinationsofbiasingvoltagesontothedualelectrodes,thechangesofE_r,whicharethekeyfactorforboostinguptheE_r×Bflowshear,wereobserved.Thetimeevolutionshowedthattheinnerelectrodeplayedamajorroleindual-biasing,whichdrewlargercurrentthantheouterone.Theouterelectrodeproducedlittleinfluence.Itturnedoutthatthedual-biasingelectrodeswereaseffectiveasasingleoneinimprovingtheplasmaconfinement,forthemechanismofbiasingwasessentiallyanedgeeffect.

简介：用磁控溅射方法制备了一系列[C(t)/Cu(2.04nm))In(n＝20,30)周期多层膜，利用四端点法、振动样品磁强计研究了多层膜的电磁性质，样品的磁电阻随钴亚层厚度的增大有一最佳值t＝1.2nm。利用同步辐射掠入射X射线散射(衍射)技术在不同的X射线能量下研究了耦合多层腹的界面结构，探索了耦合多层膜中磁电阻增强的可能原因。

简介：测量了K3C60单晶薄膜[111]方向的同步辐射角分辨光电子谱。首次观察到K3C60能带色散。通过对能带色散关系的分析，确立了K3C60低温下的一维无序取向结构。