简介:Grapheneistwodimensionalmaterialswhichismadeofhoneycombedcarbonatoms.Itattractsextensiveinterestsforitswonderfulcharacteristicsthatmakethegrapheneapotentialcandidateinfieldsofmicroelectronicsproduction,moleculedetection,desalinationandDNAsequencing.Highlychargedion(HCI)hashugepotentialenergyforpeelingoffelectrons.Wheninteractingwithsolidsurface,theHCIdistortedthesolidlatticeviapotentialdepositionandthenthenanostructureswereformedonthesolidsurface.TheHCIwasexpectedasatoolforsurfacemodification.Inthiswork,HOPGandgraphemewereirradiatedwithXeq+andArq+ions.ThetypicalRamanspectraofgrapheneandHOPGirradiatedwithhighlychargedionswereshowninFig.1.TheDpeakappearedat1335cm??1onthespectraofgrapheneirradiatedwithhighlychargedions.TheintensityofDpeakincreasedwithfluence.TheratioofintensityofDpeaktothatofGpeakvariedwithfluenceinFig.2.Theratioroselinearlywiththesquarerootoffluencewhenfluencewaslow.Theratiosaturatedwhentheirradiationfluencewashigh.Thecriticalfluencedependedonthechargestateofion.Thehigherchargestateitwas,thelowercriticalfluenceitwouldbe.
简介:Inthequantumkeydistributionsystem,quantumchannelisalwaysaffectedbyspontaneousRamanscatteringnoisewhenittransmitswithclassicalchannelsthatactassynchronizationanddatachannelsonasharedfiber.Tostudytheeffectofthenoiseexactly,thetemporaldistributioncharacteristicsoftheRamanscatteringnoiseareanalyzedtheoreticallyandmeasuredbyasingle-photondetector.Onthebasisofthis,aschemetodecreasethenoiseisproposed.
简介:RamanpeaksofvarioushydratesintheH2O-NaCl-CaCl2systemhavebeenpreviouslyidentified,butaquantitativerelationshipbetweentheRamanpeaksandXNaCl(i.e.,NaCl/(NaCl+CaCl2))hasnotbeenestablished,mainlyduetothedifficultytofreezethesolutions.Thisproblemwassolvedbyaddingaluminapowdertothesolutionstofacilitatenucleationofcrystals.Cryogenic(-185oC)Ramanspectroscopicstudiesofalumina-spicedsolutionsindicatethatXNaClislinearlycorrelatedwiththetotalpeakareafractionofhydrohalite.Capsulesofsolutionsmadefromsilicacapillarywerepreparedtosimulatefluidinclusions.Mostoftheseartificialfluidinclusionscouldnotbetotallyfrozenevenattemperaturesaslowas-185oC,andthetotalpeakareafractionofhydrohaliteisnotcorrelatedlinearlywithXNaCl.However,thedegreeofdeviation(?XNaCl)fromthelinearcorrelationestablishedearlierisrelatedtotheamountofresidualsolution,whichisreflectedbytheratio(r)ofthebaseline"bump"area,resultingfromtheinterstitialunfrozenbrinenear3435cm-1,andthetotalhydratepeakareabetween3350and3600cm-1.Alinearcorrelationbetween?XNaClandrisestablishedtoestimateXNaClfromcryogenicRamanspectroscopicanalysisforfluidinclusions.
简介:Two-dimensional(2D)materialshaveattractedgreatresearchinterestsduetotheiruniqueproperties.2DMoS2,unlikeitsbulkformwhichwidelyusedassolidlubricantandcatalyst,isofbrilliantapplicationprospectinnanoelectronicsandoptoelectrnics.Theelectronicdevicesworkinkindsofradiationenvironment.Toevaluatetheionradiationeffectsonmaterialpropertiesandstabilityofdevice,theswiftheavyionradiationeffectonsingle-layerMoS2wasstudiedinthiswork[1??2].
简介:Siliconcarbidefiber/siliconcarbidematrix(SiCf/SiC)compositesareofinterestasafuelcladdingandstructuralmaterialindesignsofadvancednuclearreactorduetotheirsuperiorthermo-mechanicalpropertiesandstabilitiesandlowcross-sectionforneutroncaptureunderthesevereserviceenvironmentincludinghightemperatureandhighenergyneutronbombardment.SiCf/SiCcompositionsconsistsofSiCfiberandSiCmatrixwhichexistinwellover100polymorphsdependentonthevariedstackingofSi-Cclose-packedatomicplanes,2H-SiC,4H-SiC,6H-SiC,3C-SiC,15R-SiC,etc.EnergeticHeatomscanbecreatedandaccumulatedvianuclearreactions.HeatomsagglomerateandcoarsenintoHebubblesandcandeterioratestructuralpropertiesbyinducingcrackandcreep.Inthisexperiment,thedamageofn-type4H-SiCwafers(researchstandard,suppliedbytheCreeResearchInc.)withathicknessof0.38mmimplantedwith100keVHe+toafluenceof31016He+/cm2andpost-implantation-annealedbehavioratdifferenttemperaturewerestudiedusingRamanscatteringspectroscopy.
简介:摘要传统的称重法是最可靠的检测粉尘浓度的方法,但由于其费时费力,近年来,便携式粉尘测试仪得到人们的青睐,其中光散射式数字粉尘测试仪以性能稳定、灵敏度高、测量方便等优势得到广泛应用,但测量结果是粉尘仪的相对浓度,所以,为保证测量结果既有称重法的可靠性,又有直测法的方便性,依据滤膜称重原理使用校准粒子对美国TSI生产的AM510进行校准,并进行测量结果的不确定度分析,既实现了粉尘仪的量值溯源,也提供了测量结果的可靠性保证。
简介:摘要现代军事作战越来越强调隐身性能,通过对良好的隐身材料以及雷达散射特性技术的运用来提高作战中的隐身性能,不仅能够有效保存己方有生力量,还能够在很大程度上对敌人发起致命一击,应用价值较高。随着科学技术不断向前发展,雷达散射特性研究工作已广泛展开并取得了初步阶段的研究成果,实际运用成果瞩目。因此对其在军事目标伪装中的技术特点与应用进行研究对促进我国相关研究的发展以及提高国防水平具有重要的促进作用以及现实意义。
简介:在这份报纸,消极地切换Q、锁模式的c切割在1.17m的做Nd的vanadate水晶self-Raman激光被使用Cr第一表明<啜class=“a-plus-plus”>4+:YAG。Nd的二晶体<啜class=“a-plus-plus”>3+:YVO4和Nd<啜class=“a-plus-plus”>3+:GdVO4被采用分别地产生激光。与13W的事件泵力量,在1.17m的678mW和852mW的平均产量力量分别地与1.8ns和2ns的切换Q的信封的持续时间被获得。锁模式的重复率分别地象2.3Hz和2.2GHz一样高。根据我们知道,切换Q的信封是最狭窄并且锁模式的重复率是最高目前在这块地里。另外,黄激光输出被使用解放也完成<潜水艇class=“a-plus-plus”>3O<潜水艇class=“a-plus-plus”>5频率加倍水晶。
简介:一系列立方的稀土元素sesquioxidesRE2O3的拉曼系列(RE=Eu,Gd,Dy,惊讶,嗯,Tm,Yb,陆,Sc和Y)被拉曼光谱学与532和785根nm激光线调查。丰富的另外的乐队由于激光激动的光被观察。为Eu2O3,Dy2O3,Ho2O3,Er2O3,Tm2O3和Yb2O3,,光主要为Gd2O3,Lu2O3,Sc2O3和Y2O3来自内在的三价的lanthanide离子,他们的光被归因于象Eu3+,Nd3+和Er3+那样的另外的光lanthanide离子的踪迹杂质。这调查为检测踪迹作为一个有用工具证实了拉曼光谱学光lanthanide杂质。
简介:ByusingPDM-OFDM-16QAMmodulation,all-Ramanamplification,coherentdetection,and7%forwarderrorcorrection(FEC)threshold,wesuccessfullydemonstrate63-Tb/s(368×183.3-Gb/s)signalover160-kmstandardsinglemodefiber(SSMF)transmissionintheC-andL-bandswith25-GHzchannelspacing.368opticalchannelswithbandwidthspacingof25GHzaregeneratedfrom16externalcavitylasersources.After160-kmSSMFtransmission,alltestedbiterrorrate(BER)areunder3.8×10-3,whichcanberecoveredby7%FECthreshold.Withineachchannel,weachievethespectralefficiencyof6.85bit/s/HzinC/Lband.