简介：Ithasbeenproposedthatfusionreactionsbetweenneutron-richlightnuclei,forexample24C,24Oand28Ne,maycontributetoachievingtheignitiontemperatureforexplosivecarbonburningprocessduringsuperbusrsts[1,2].Studiesoffusionreactionsinvolvingneutron-richnucleiarebeyondordinaryexperimentaltechniques,sincetheintensityofradioactivebeambecomelowforthesemeasurements[3].TheactivetargettechniqueusingTPC(TimeProjectionChamber),withpropertiesofmulti-sampling,highefficiencyandlowbackground,isasuitablesolutiontotheproblem.

简介：Inthispaper,thevariableseparationapproachisusedtoobtainlocalizedcoherentstructuresofthe(2+1)-dimensionalgeneralizedDavey-Stewarsonequations:iqt+1/2(qxx+qyy)+(R+S)q=O,Rx=-σ/2|q|2ySy=-σ/2|q|2/x.ApplyingaspecialBacklundtransformationandintroducingarbitraryfunctionsoftheseedsolutions,anabundanceofthelocalizedstructuresofthismodelisderived.Byselectingthearbitraryfunctionsappropriately,somespecialtypesoflocalizedexcitationssuchasdromions,dromionlattice,breathers,andinstantonsareconstructed.

简介：MOS型功率场效应管具有大的脉冲开关电流(数十安培)、较高的漏源电压(达千伏)、小的导通内阻(欧姆量级)和较快的导通时间(数纳秒)。由于其输入输出电容大，故用其制作的脉冲源抗脉冲电磁干扰能力较强，也因此它的开关速度较慢。采用过驱动能提高MOS型功率场效应管的开关速度。就是使栅极驱动脉冲波形的前沿很快且上冲大大超过额定的栅源驱动电压。为此，在研制过程中，解决了用多个场效应管串、并联组合，形成具有纳秒级陡峭前沿的大电流开关；用多个脉冲变压器并联，对大电流开关输出的信号进行放大和成形；用脉冲变压器的技术解决了大功率脉冲功率合成等关键技术，采用稳定的开关器件等技术和工艺，解决低压电路抗高速高压强电干扰。实现了用固体器件—场效应管，替代国外氢闸流管部分用途的功能。

简介：Thespectrumofisospin3/2Δ++(1232)excitedstatesisoneofthemostimportantissuesinhadronicphysicsandisattractingmuchattentionbecauseitisthemostexperimentallyaccessiblesystemcomposedofthreeidenticalvalencequarks.However,ourknowledgeontheseresonancesmainlycomesfromoldNexperimentsandisstillverypoor[1].Intheenergyregionaroundorabove2.0GeV,therearestillmanytheoreticalpredictionsofmissingΔstateswhichhavesofarnotbeenobserved.Searchingforthesemissingstatesfromotherproductionprocessesisnecessary.ApossiblenewexcellentsourceforstudyingtheseΔresonancecomprisesthe+p!K+Σ+(1385)andpp!nK+Σ+(1385)reactions,whichhaveaspecialadvantage,i:e:,thereisnocontributionsfromisospin1/2nucleonresonancesduetotheisospinandchargeconservations.

简介：说到课程改革，常挂嘴边的就是“更新观念”．一点不错，“改革”是行为，“观念”是思想，行为受思想支配．要转变什么观念？不少人可以说出一大串，但大都只是表达一些陈述性的条文，而行动上却不完全是那么回事，甚至完全不是那么回事．在思考“课改已近十年，而现实教学却并未发生根本性改观”的原因时，我曾以为“咱们并不缺少新的理念，

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简介：TheCMSCollaborationof2000scientistsinvolves150institutionsfrom31nationsspreadallovertheworld.CMSsoftwaresystemintegrationandreleasemanagementisperformedatCERN.CodemanagementisbasedonCVS,withreadorwriteaccesstotherepositoryviaaCVSserver,Softwareconfiguration,releasemanagementtools(SCRAM)arebeingdevelopedatCERN.Softwarereleasesarethendistributedtoregionalcenters,wherethesoftwareisusedbyalocalcommunityforawidevarietyoftasks,suchassoftwaredevelopmentdetectorsimulationandreconstructionandphysicsanalysis.Dependingonspecificapplication,thesystemenvironmentandlocalhardwarerequirements,differentapproachesandtoolsareusedfortheCMSsoftwareinstallationatdifferentplaces.Thispresentationdescribesconceptsandreactialsolutionsforavarietyofwaysofsoftwaredistribution,withanemphasisontheCMSexperienceatFermilab,Installationandusageofdifferentmodelsusedfortheproductionfarm,forcodedevelopmentandforphysicsanalysisaredescribed.

简介：TheenigmaticchargedstatesZc(3900),Zc(4020),Zc(4050),Zb(10610),andZb(10650)arestudiedwithinacoupled-channelSchr¨odingermodel[1],whereradiallyexcitedquark-antiquark(qˉq)pairs,withthesameangularmomentaandisospinasthea1(1260)andb1(1235),arestronglycoupledtotheirOkubo-Zweig-Iizuka-allowedde-caychannelsDˉD+ˉDDandDˉD,orBˉB+ˉBBandBˉB,inSandD-wave.Poles,matchingtheexperimentalmassandwidthofalltheabovestates,arefoundbyvaryingonlytwofreeparameters.In

简介：Themesonproductioninnucleon-nucleoncollisionsnearthresholdhasthepotentialtogaininformationonhadronpropertiesandalsoplaysanimportantroleinexploringthebaryonspectroscopy[1].Inrecentyears,theexperimentaldatabaseonthereactionofpp!ppK+Knearthresholdhasbeenexpandedsignificantly.Inadditiontothemeasurementsofthetotalanddifferentialcrosssections,belowthethresholdoftheproductionofthe?meson,performedexperimentallywithCOSY-11andANKEdetectorsatthecoolersynchrotronCOSYinGermany,invariantmassdistributionsofvarioussubsystemshavebeenobtainedatlowenergies.Unlikeabovethethresholdoftheproductionofthe?meson,inthelowenergyregion,wedonotneedtoseparatethenon-?fromthe?contribution,andduetothefactthatthedatawerespreadoverawiderangeofK+K??invariantmasses,ithasaspecialadvantagetoinvestigatethescalarmesonsa0(980)$andf0(980)whicharedynamicallygeneratedfromtheinteractionsofK￣K,ππ,andπηtreatedascoupledchannelsinI=0andI=1,respectively.BothofthemcouplestronglytotheK￣Kchannel.

简介：InfluenceoftheeffectivefermionhexadecapoleforcenewlyincorporatedinamicroscopicsdgIBM-1onspectra,reducedE2andE4transitionmatrixelements(T(E2)sandT(E4)s)intheeven-evenplatinumisotopes(A=192,194,196,198)isinvestigatedintermsofnumericalcalculations.ItisfoundthattheintroducedinteractioncausesonlylimitedmodificationtothespectrumandT(E2)s,apartfromafewexceptions.However,itplaysanessentialroleindescribingE4transitions.Thusinthecasethattheinteractionisincorporatedwithcertainstrength,areasonabledescriptionofalltheE4transitionsintheplatinumisotopesisreachedinthemicroscopicsdgIBM-1incomparingbothtoexperimentaldataandtheresultscalculatedinphenomenologicalbosonmodel.``

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简介：Weproposeandexperimentallydemonstratecompacton-chip1×2wavelengthselectiveswitches(WSSs)basedonsiliconmicroringresonators(MRRs)withnestedpairsofsubrings(NPSs).OwingtotheresonancesplittinginducedbytheinnerNPSs,theproposeddevicesarecapableofperformingselectivechannelroutingatcertainresonancewavelengthsoftheouterMRRs.SystemdemonstrationofdynamicchannelroutingusingfabricateddeviceswithoneandtwoNPSsiscarriedoutfor10Gb∕snon-return-to-zerosignal.Theexperimentalresultsverifytheeffectivenessofthefabricateddevicesascompacton-chipWSSs.

简介：Atheoreticaldesignispresentedfora1×Mwavelength-selectiveswitch（WSS）thatroutesanyoneofNincomingwavelengthsignalstoanyoneofMoutputports.Thisplanaron-chipdevicecomprisesofa1×Ndemultiplexer,agroupofNswitching'trees'actuatedbyelectro-opticalorthermo-opticalmeans,andanM-foldsetofN×1multiplexers.Treesutilize1×2switches.TheWSSinsertionlossisproportionalto(log2（M+N+1）)Alongwithcrosstalkfromtrees,crosstalkispresentateachcross-illuminatedwaveguideintersectionwithintheWSS,andthereareatmostN-1suchcrossingsperpath.TheselossandcrosstalkpropertieswilllikelyplaceapracticallimitofN=M=16upontheWSSsize.Byconstrainingthe1×2switchingenergyto1fJ∕bit,wefindthatresonant,narrowband1×2switchesarerequired.The1×2devicesproposedherearenanobeamMach–Zehndersandasymmetriccontra-directionalcouplerswithgratingassistance.

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简介：为研究空间用四结太阳电池中InGaAsP/InGaAs子电池在电子辐照条件下的性能衰退情况,对InGaAsP/InGaAs双结电池开展了1MeV电子辐照试验,测试了辐照前后的电学参数和量子效率,分析讨论了参数退化情况.结果表明：随着电子注量和位移损伤剂量的增加,电池性能参数退化程度逐渐加大;由位移损伤缺陷导致的载流子寿命减小,是导致电池短路电流和开路电压下降的主要原因;InGaAsP/InGaAs双结电池基区损伤比发射区损伤更加严重,因此,提高其抗辐射能力的关键在于优化基区结构.

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简介：Magnetoplasmonicsensorsareattractivecandidatesforultrasensitivechemicalandbiomedicalsensorapplications.Avarietyofferromagneticmetalthinfilmshavebeenusedformagnetoplasmonicdeviceapplications,yetthedependenceofsensorperformanceontheopticalandmagneto-opticalpropertiesofferromagneticmetalmaterialshasbeenrarelystudied.Inthiswork,wereportthestudyofenhancedmagneto-opticalKerreffect（MOKE）andsensingperformanceinAu∕FexCo1-xbilayermagneto-opticalsurfaceplasmonresonance（MOSPR）transducers.TheopticalconstantsofFexCo1-x（x=0,0.29,0.47,0.65,and1）inasputter-depositedAu∕FexCo1-xdevicearecharacterizedbytheattenuatedtotalinternalreflection（ATR）method.FexCo1-xthinfilmsshowdifferentMOKEsasafunctionofthechemicalconcentration,withthehighesttransverseMOKEsignalobservedinFe0.7Co0.3.Indexsensingperformanceiscloselyrelatedtothematerial’sopticalandmagneto-opticalconstants.BystudyingthesensingperformanceintheparameterspaceoftheAu∕FexCo1-xbilayerthicknesses,thehighestsensitivityisfoundtobe0.385（theoretical）and0.306RIU-1（experimental）intheAu∕Fe0.7Co0.3MOSPRdevices.OurresearchhighlightstheinfluenceoftheopticalpropertiesofferromagneticmaterialtodevicesensitivityinMOSPRtransducers.ThehighsensitivityinAu∕FexCo1-xMOSPRdevicesmakethesestructuresattractivecandidatesforchemicalandbiomedicalsensingapplications.

简介：AseriesofRbxCs1-xAg4I5(x=0-1)thinfilmsweregrownbyvacuumevaporationonNaCIcrystalsubstratesat350K.Theabsorptionspectraofthesefilmsweremeasuredat80Kinthewavelengthrangefrom240nmto400nm.ItisshownthatsuperionicconductorthinfilmsofquaternarycompoundRb0.5Cs0.5Ag4I5andternarycompoundRbAg415canbeobtainedatx=0.5-0.6andx=0.7-1,respectively.Atx=0.65,thecombinedcompoundfilmofthemixtureof30mol%RbAg4I5and70mol%Rb0.5Cs0.5Ag4I5ispresented.Then,basedonthespectralpositionsoftheA1andA2peaks,wedeterminedthattheRb0.5Cs0.5Ag4I5excitoncouplingenergyRexis0.21eV,theforbiddenzonewidthEgis3.82eVandtheexcitonradiusaexis0.70hm.Furthermore,theionicconductivitiesofsuperionicconductorthinfilmsofRbAg4I5andRb0.5Cs0.5Ag4I5andtheirmixturefilmareinvestigated,respectively,inthetemperaturerange303K-393K.

简介：Inthispaper,adetailedLiesymmetryanalysisofthe(2+1)-dimensionalcouplednonlinearextensionofthereaction-diffusionequationispresented.Thegeneralfinitetransformationgroupisderivedviaasimpledirectmethod,whichisequivalenttoLiepointsymmetrygroupactually.Similarityreductionandsomeexactsolutionsoftheoriginalequationareobtainedbasedontheoptimalsystemofone-dimensionalsubalgebras.Inaddition,conservationlawsareconstructedbyemployingthenewconservationtheorem.

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