简介：Thispapercarriesoutabinitiocalculationstostudythe80Se2(X3Σg-)stateand80Se2(X2Πg),80Se2(a4Πg)statesbyusingcompletedactivespaceself-consistentfieldandmulti-referencesecondorderperturbationtheory.Theelectroniccurvesofthesestatesincludingspin-orbitcouplingarecalculated,andthenthespectroscopicparametersareobtained.Thephotoelectronspectraof80Se2moleculeingasphaseareassignedaccordingtoFranck-Condonanalysisbasedoncalculatedpotentialenergycurves.Theionizationenergiesof80Se2moleculearedeterminedbythepresentcalculation.

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简介：二轨道的哈伯德模型被在真实空间和动量空间使用Hartree-Fock近似数字地学习，并且碱金属的地面状态性质熨硒化物半导体的KFe1.5Se2被调查。有，顺序被发现的stripetypeantiferromagnetic(AFM)的一份菱形类型Fe空缺订单在散布实验的中子被观察[J.赵，等，Phys。加快。Lett。109，267003(2012)]。跳跃参数被在真实空间适合试验性地观察的条纹AFM阶段获得。这些跳跃参数然后被用来在动量空格学习半导体的地面状态性质。是有大所在地的库仑排斥U的一个强烈相关的系统被发现，类似于莫特·阿夫姆绝缘体铜氧化物超导体的父母混合物。我们也发现在dxz和dyzorbitals的电子职业数字和磁化同时变得不同，显示轨道的订什么时候U>Uc(3.4eV)。这些结果暗示在二orbitals之间的旋转对称被轨道的订打破并且因此驾驶磁性的联合的强壮的anisotropy被实验观察了并且在这混合物的条纹类型AFM顺序可以被和观察大anisotropy的轨道的订引起。

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简介：Thispaperisconcernedwithexperimentalandnumericalresearchon3DflowpastprismaticturbinecascadeSE1050(knowninQNETnetworkasopentestcaseSE1050).Theprimarygoalwastoassesstheinfluenceoftheinletvelocityprofileontheflowstructuresintheinterbladechannelandontheflowfieldparametersatthecascadeexitandtocomparethesefindingstoresultsofnumericalsimulations.Investigationsof3Dflowpastthecascadewithnon-uniforminletvelocityprofilewerecarriedoutbothexperimentallyandnumericallyatsubsonic(M2is=0.8)andattransonic(M2is=1.2)regimeatdesignangleofincidence.Experimentaldatawasobtainedusingatraversingdevicewithafive-holeconicalprobe.Numerically,the3DflowwassimulatedbyopensourcecodeOpenFOAMandin-housecode.AnalysesofexperimentaldataandCFDsimulationshaverevealedthedevelopmentofdistinctivevortexstructuresresultingfromnon-uniforminletvelocityprofile.Originofthesestructuresresultsinincreasedlossofkineticenergyandspanwiseshiftofkineticenergylosscoefficientdistribution.Differencesfoundbetweenthesubsonicandthetransoniccaseconfirmearlierfindingsavailableintheliterature.ResultsofCFDandexperimentsagreereasonablywell.

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简介：中考是全区统一的大规模选拔考试，其试题应具有较高的信度、效度和必要的区分度。今年广西的中考物理试题继续遵循着这一中考命题的指导思想和基本原则。从试题的具体设计看，与９６、９７两年试题比较，虽然有某些变化，但整体来看，试卷涉及的知识内容没有超出中考的《...

简介：Wemeasurethecurrent–voltage(I–V)characteristicsforthesinglecrystalofTl0.4K0.41Fe1.71Se2withthesuperconductingtransitiontemperature(TC)around30.5K,undera10Tmagneticfieldappliedperpendicularandparalleltotheabplane.WefindthattheshapesoftheI–Visothermsareverydifferentfromthedescriptionbythevortex-glass(VG)model.CombiningtheoreticalcalculationsandanalysisoftheρH⊥ab–TandρHab–Tdata,wegiveanexplicitdiscussionoverthesuitabilityoftheVGmodelfortheA0.8Fe2Se2superconductors,andpointoutthepossibilityofthematerialactingasaconvenientplatformforre-examinationandfurtherstudyofthecomplexvortexbehaviorsinthelayeredsuperconductors.

简介：Broadband（1.6–18THz）terahertztime-domainspectroscopy（THz-TDS）andtime-resolvedterahertzspectroscopy（TRTS）wereperformedona54μmthickchalcogenideglass(As30Se30Te40)samplewithatwo-colorlaser-inducedairplasmaTHzsystemintransmissionandreflectionmodes,respectively.Twoabsorptionbandsat2–3and5–8THzwereobserved.TRTSrevealsanultrafastrelaxationprocessofthephotoinducedcarrierresponse,welldescribedbyarateequationmodelwithafiniteconcentrationofmid-bandgaptrapstatesforself-trappedexcitons.ThephotoinducedconductivitycanbewelldescribedbytheDrude–Smithconductivitymodelwithacarrierscatteringtimeof12–17fs,andweobservesignificantcarrierlocalizationeffects.Afastrefractiveindexchangewasobserved100fsbeforetheconductivityreacheditsmaximum,with2ordersofmagnitudelargeramplitudethanexpectedfortheopticallyinducedTHzKerreffect,indicatingthatfreecarriersareresponsibleforthetransientindexchange.

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简介：WereportQ-switchedandmode-lockederbium-dopedall-fiberlasersusingternaryReS2(1-x)Se2xassaturableabsorbers(SAs).ThemodulationdepthandsaturableintensityofthefilmSAare1.8%and0.046MW∕cm2.InQ-switchedmechanismoutput,thepulsewascenteredat1531.1nmwithmaximumpulseenergyandminimumpulsewidthof28.29nJand1.07μs,respectively.Inmode-lockedoperation,thepulsewascenteredat1561.15nmwithpulsewidthof888fs,repetitionrateof2.95MHz,andmaximumpulseenergyof0.275nJ.Tothebestofourknowledge,thisisthefirstreportonthemode-lockedEr3+-dopedfiberlaserusingternarytransitionmetaldichalcogenides.Thisworksuggestsprospective2D-materialSAscanbewidelyusedinversatilefieldsduetotheirattractiveoptoelectronicandtunableenergybandgapproperties.