简介:ThispaperstudiestheequilibriumgeometriesandelectronicpropertiesofBenandBenLiclusters,upton=15,byusingdensity-functionaltheory(DFT)atB3LYP/6-31G(d)level.Thelowest-energystructuresofBenandBenLiclustersweredetermined.Theresultsindicatethatasinglelithiumimpurityenhancesthestabilityandchemicalreactivityoftheberylliumclusters.Itfindsthatthegeometriesofthehostclusterschangesignificantlyaftertheadditionofthelithiumatomforn≥8.Thelithiumimpuritypreferstobeontheperipheryofberylliumclusters,andoccupiesvertexsites.BothBe4Li,Be9Li,andBe13Liwerefoundtobeparticularlystablewithhigheraveragebindingenergy,localpeaksofsecond-orderenergydifferenceandfragmentationenergies.ForalltheBenLiclustersstudied,wefoundchargetransfersfromtheLitoBesiteandco-existenceofcovalentandmetallicbondingcharacteristics.更多还原
简介:Thestructureandbindingenergyofcopperclustersofthesizerange70to150werestudiedbyusingtheembeddedatommethod.Thestabilityofthestructureoftheclusterswasstudiedbycalculatingtheaveragebindingenergyperatom,firstdifferenceenergyandseconddifferenceenergyofcoppercluster.Mostofthecopperclustersofthesizen=70-150adoptanicosahedralstructure.Theresultsshowthatthetrendsareinagreementwiththeoreticpredictionforcopperclusters.Themoststablestructuresforcopperclustersarefoundatn=77,90,95,131,139.
简介:Inthispaper,weinvestigateperfectquantumteleportationanddensecodingbyusingan2N-qubitWstatechannel.Inthequantumteleportationscheme,anunknownN-qubitentangledstatecanbeperfectlyteleported.Oneebitofentanglementandtwobitsofclassicalcommunicationareconsumedintheteleportationprocess,justlikewhenusingtheBellstatechannel.WhileN+1bitsofclassicalinformationcanbetransmittedbyonlysendingNparticlesinthedensecodingprotocol.
简介:FirstObservationofYrastBandinN=91Odd-odd162LuNucleus¥ZhangYuhu;ZhouXiaohong;ZhaoQingzhong;SunXiangfu;LeiXiangguo;?..
简介:为在一种尺寸与开的边界条件跳跃相关的N部件Bariev模型在并列Betheansatz方法的框架被学习。Theenergy光谱,integrable边界条件和相应Betheansatz方程被导出。
简介:ThepresolarSiCgrains[1]carrytheoriginalstellarnucleosynthesissignature.Theirisotopicanomaliescomparedtothesunarethestrongconstrainsinthesupernovae(SN)modelcalculations.The15N-excessinsomeSiC-ABgrains(12C/13C<10and14N/15N<272)isoneofthechallengesofcore-collapsesupernovae(CCSNe)models[2].Recently,PignataripointedoutthattheentrainmentofH-richmaterialintotheHeshellbeforetheSNexplosionallowsthecoproductionof13C,15Nand26Al,whichprovidesanewproductionscenarioforSiC-ABgrains[2].IntheHeshellnucleosynthesis,the13Cisproducedthrough12C(p,γ)13N(β+γ)13Creaction.The14Nissynthesizedthrough13N(n,γ)and13C(p,γ)reactions.
简介:LargeapertureNd:phosphatelaserglassisakeyopticalelementforaninertialconfinementfusion(ICF)facility.N31,onetypeofneodymiumdopedphosphateglasses,wasdevelopedforhighpeakpowerlaserfacilityapplicationsinChina.ThecompositionandmainpropertiesofN31glassaregiven,togetherwiththoseofLHG-8,LG-770,andKGSS-0180Nd:phosphatelaserglasses,fromHoyaandSchott,andfromRussia.Thetechnologiesofpotmelting,continuousmelting,andedgecladdingoflargesizeN31phosphatelaserglassarebrieflydescribed.ThesmallsignalgainprofilesofN31glassslabsfrombothpotmeltingandcontinuousmeltingatvariousvaluesofthepumpingenergyofthexenonlamparepresented.N31glassischaracterizedbyastimulatedemissioncrosssectionof3.8×10-20cm2at1053nm,anabsorptioncoefficientof0.10–0.15%cm-1atlaserwavelength,smallresidualstressaroundtheinterfacebetweenthecladdingglassandthelaserglass,opticalhomogeneityof~2×10-6ina400mmaperture,andlaserdamagethresholdlargerthan42J/cm2fora3nspulsewidthat1064nmwavelength.
简介:Non-noblemetal-basedcatalysts,especiallystableones,havegainedincreasingattentionsinthefieldofelectronicallycatalytichydrogenevolutionreaction(HER).Inthiswork,anN-dopedcarbonconfinedCo–Nialloywithreducedgrapheneoxide(rGO)decoration(CoNi@N-C/rGO)wasfabricatedforHER.ThepreparedcatalystexhibitedexcellentHERactivityinanacidicelectrolyte(Tafelslopeof~133.7mV).TheresultsshowedthattheenhancedHERperformanceofthenanostructuresisattributedtothechemicalandelectronicsynergiceffectbetweentheconfinedCo–NialloyandrGO.Stabilitytests,realizedvialongtermpotentialcyclesandextendedelectrolysis,providedtheconfirmationoftheexceptionaldurabilityofthecatalyst,whichoriginatedfromtheconfiningeffectoftheN-dopedcarbonshell.Thisversatilemethodprovidesastrategyfordesigningstablenon-preciousmetalelectrocatalystsconfinedbycarboncoating.
简介:Accordingtothegoodchargetransportingpropertyofperovskite,wedesignandsimulateap–i–n-typeall-perovskitesolarcellbyusingone-dimensionaldevicesimulator.Theperovskitechargetransportinglayersandtheperovskiteabsorberconstitutetheall-perovskitecell.Bymodulatingthecellparameters,suchaslayerthicknessvalues,dopingconcentrationsandenergybandsofn-,i-,andp-typeperovskitelayers,theall-perovskitesolarcellobtainsahighpowerconversionefficiencyof25.84%.Thebandmatchedcellshowsappreciablyimprovedperformancewithwidenabsorptionspectrumandloweredrecombinationrate,soweobtainahighJ_(sc)of32.47mA/cm~2.Thesmallseriesresistanceoftheall-perovskitesolarcellalsobenefitsthehighJ_(sc).Thesimulationprovidesanovelthoughtofdesigningperovskitesolarcellswithsimpleproducingprocess,lowproductioncostandhighefficientstructuretosolvetheenergyproblem.
简介:制备了金属-铁电层-绝缘层-半导体(Pt/Bi3.15Nd0.85Ti3O12/YSZ/Si,MFIS)二极管,研究了该二极管的存储窗口电压、疲劳特性和高温保持特性。结果表明:该二极管的存储窗口电压随扫描电压的增大呈先增大后减小的趋势,其中最大存储窗口电压约为0.88V且存储窗口电压的变化几乎不受扫描电压的扫描速度与频率的影响;该二极管在109次翻转循环后,其积累电容和耗尽电容基本没有变化,且存储窗口电压仅下降了5%。另外,该二极管在80℃下加速测量8h(相当于常温下测量60d)后,加速后器件的电容差比加速前降低了13%,说明该二极管抗疲劳特性和高温特性良好。
简介:利用TCAD仿真技术,研究了电离总剂量辐射陷阱电荷对0.18μmN沟道MOSFET转移特性的影响.构建了0.18μmN沟道MOSFET的三维仿真结构,获得了在电离总剂量(totalionizingdose,TID)效应影响下,负栅压偏置时器件中电流密度的分布情况.分析了器件浅槽隔离层(shallowtrenchisolation,STI)中氧化物陷阱电荷和界面态陷阱电荷对器件泄漏电流的影响.仿真计算了N-MOSFET的转移特性,仿真结果与辐照试验结果受辐照影响的趋势基本一致,为深亚微米MOS器件的总剂量辐射效应的损伤机制提供了一种分析手段.