简介：WeinvestigateindetailtheeffectsofR-parityleptonnumberviolationonthedecay~↑b1→b~↑x1^0intheR-parityviolatingminimalsupersymmetricstandardmodel(Rp-MSSM)underthepresentexperimentalconstraintsonRpparameters.Inournumericalcalculationsweconsidertwocasesofinputparametersofthesquarkandsleptonsectors,MsquarkMslepton,forcomparison.TheresultsshowthattherelativeR-parityviolatingcorrectionisnotverysensitivetothemassofthelightestneutralino-0↑x1andthedegenerateR-parityviolatingcouplingparameterλ2′,butstronglydependsonMsquark,Mslepton,tanβandthedegenerateR-parityviolatingcouplingparameterλ1′.Therelativecorrectionisabout-4～3%andcanexceed-6%insomeregionofparameterspace.Therefore,preciseexperimentanalysesonthedecay~↑b1→b~↑x1^0mayprovideaprobeoftheR-parityviolation.

简介：一个新算法被介绍产生开发通过一条Bézier曲线的表面把一根准线称为的有能力的Bézier。算法基于微分几何学理论在上必要；为是的表面的足够的条件发展能，；在为参数曲线的度评估公式上；为伯恩斯坦基础的线性独立。没有非线性的典型方程不得不被解决。而且为一个锥的顶点；为正切表面的回归的边能容易被获得。Aumann的算法为开发有能力的表面是这篇论文的一种特殊情况。

简介：由于与会者来自国内高校物理教学第一线，讨论起教学来非常热烈。

简介：BasedonthelowenergyeffectiveHamiitonianwithnaivefactorization,wecalculatethebranchingratios（BRs）andCPasymmetries（CPAs）forthetwentythreedoublecharmdecaysB/Bs→Ds*Ds*inboththestandardmodel（SM）andtheminimalsupergravity（mSUGRA）model.Withintheconsideredparameterspace,wefindthat（a）thetheoreticalpredictionsfortheBRs,CPAsandthepolarizationfractionsintheSMandthemSUGRAmodelareallconsistentwiththecurrentlyavailabledatawithin±2σerrors;（b）Foralltheconsidereddecays,thesupersymmetriccontributionsinthemSUGRAmodelareverysmall,lessthan7%numerically.ItmaybedifficulttoobservesosmallSUSYcontributionsevenatLHC.

简介：TheHERA-BdataacquisitionandtriggeringsystemsmakeuseofLinuxPCfarmsfortriggeringandonlineeventreconstruction.Wepresentinthispapertherequirements,implementationandperformanceofbothPCfarms.Theyhavebeenfullyworkingduringtheyear2000detectorandtriggercommissioningrun.

简介：WestudyproductionofthetetraquarkstateTccviavirtualphotonattheB-factoriesintheQCDfactorizationframework.WepredictthecrosssectionoftetraquarkstateproductionintheleadingorderattheB-factories.

简介：MP3风靡我们的时候，我们就开始患上MP3疯魔症——眼睛睁开的第一秒，便搜索最爱的MP3，低头走路，孤立进食，默默无语……自始至终，活在一个人的世界里，你说，这不是疯了是怎么了？

简介：研究了钙钛矿太阳能电池材料CH3NH3PbI3（CH3NH3=MA,MAPbI3）的输运特性,理论分析了有机分子MA对晶格结构的影响。发现：MA沿[110]方向排布且近邻MA分子相互垂直的构型最稳定,将此构型作为MAPbI3的标准结构,使用第一性原理方法,通过分析晶格的振动散射或声子散射,计算了MAPbI3材料中形变势散射主导的载流子迁移率,分析了材料的输运特性,讨论了载流子迁移率理论计算值和实验值之间的差异。

简介：YbxY1-xAl3(BO3)4(x=0.1,0.07and0)crystalshavebeengrownbythefluxmethod.ThegrowthdefectsofYbxY1-xAl3(BO3)4crystalsweredetectedbyX-raytopography.ItisfoundthattheperfcetionofYbYABcrystalwithlowYbdopantisbetterthanthatwithhighYbdopant.InYb0.1Y0.9Al3(BO3)4crystal,growhtbands,growthboundaries,grown-indislocationsandinclusionswereobserved.Howver,thedensitiesofgrowthdefectsforYb0.07Y0.93Al3(BO3)4andYAl3(BO3)4arelowandnoobviousinclusionsareobservedinthesecrytals.Inaddition,growthtwinswrerdetectedinYbxY1-xAl3(BO3)4crystalbyusingthechemicaletchingmethod.ItisfoundthatthegrowthtwinsoccurfrequentlyinYb0.01Y0.9Al3(BO3)4crystalwhereasnogrowthtwinappearsinYAl3(BO3)4crystal.Basedontheexperimentalobservations,theformationmechanismofgrowthtwinsisdiscussed.Inthemeantime,theeffectivemeasuresforreducingthegrowthtwinsanddefectsareproposed.2001ElsevierScienceB.V.Allrightsreserved.

简介：Inthispaper,wereportedamultiwavelengthpassivelyQ-switchedYb3+:GdAl3（BO3）4solid-statelaserwithtopologicalinsulatorBi2Te3asasaturableabsorber（SA）forthefirsttime,tothebestofourknowledge.Bi2Te3nanosheetswerepreparedbythefacilesolvothermalmethod.TheinfluenceofthreeBi2Te3densitiesonthelaseroperationwascompared.Themaximumaverageoutputpowerwasupto57mWwithapulseenergyof511.7nJ.Theshortestpulsewidthwasmeasuredtobe370nswith110kHzpulserepetitionrateand40mWaveragepower.Thelaseroperatedatthreewavelengthssimultaneouslyat1043.7,1045.3,and1046.2nm,ofwhichthefrequencydifferenceswerewithintheterahertzwaveband.OurworksuggeststhatsolvothermalsynthesizedBi2Te3isapromisingSAforsimultaneouslymultiwavelengthlaseroperation.

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简介：InthispaperamethodoftrackreconstructiondevelopedfortheHERA-Bmaintrackingsystemisdiscussed.Themethodbasedonatrackfollowingalgorithmisusedfortrackfindinginthefield-freeareaandforthetrackpropagationthroughtheinhomogeneousmagneticfield.Theperformanceofprogramforsimulatedandrealdataisshown.

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简介：Multilayerblackphosphorus（BP）nanoplateletsofdifferentthicknesseswerepreparedbytheliquidphaseexfoliationmethodanddepositedontoyttriumaluminumgarnetsubstratestoformsaturableabsorbers（SAs）.Thesewerecharacterizedwithrespecttotheirthickness-dependentsaturableabsorptionpropertiesat3μm.TheBP-SAswereemployedinapassivelyQ-switchedEr:Lu2O3laserat2.84μm.ByusingBPexfoliatedindifferentsolvents,stablepulsesasshortas359nsweregeneratedatanaverageoutputpowerofupto755mW.Therepetitionrateintheexperimentwas107kHz,correspondingtoapulseenergyof7.1μJ.TheseresultsprovethatBP-SAshaveagreatpotentialforopticalmodulationinthemid-infraredrange.

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简介：AtrackreconstructionprogramCATSbasedonacellularautomatonhasbeendevelopedforthevertexdetectorsystemoftheHERA-BexperimentatDESY,AsegmentmodelofthecellularautomationusedfortrackingcanberegardedaslocaldiscreteformoftheDenby-Petersonneuralnet.Since1999CATShasbeenusedtoreconstructdatacollectedinHERA-B.Resultsonthetrackingperformance,andaccuracyofestimatesandcomputingtimearepresented.