学科分类
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6 个结果
  • 简介:利用Ising模型模拟了金融市场价格的变化,对相应的收益率序列分析发现,概率密度函数具有标度关系、定性符合L6vy稳定分布;序列又具有多重分形的特征。模拟结果与实证研究相一致,表明Ising模型能够有效地描述金融市场价格的形成机制。

  • 标签: ISING模型 Lévy稳定分布 多重分形 经济物理学
  • 简介:Numericalandanalyticalresultsarepresentedforthemagneticorderinginabond-dilutedspin-1/2andspin-1mixedtransverseIsingsystemwithasingle-ionanisotropyonahoneycomblattice.Specialemphsisisplacedonthemagneticorderingunderthebonddilutionandpercolationthreshold.Wediscussindetailtheinfluenceoftransversefieldsofdifferentsublatticsonthenormalmagneticorderingandonthemagneticorderinginducedbysingle-lonanisotropy.Wefindthatthemagneticorderingofasystemexhibitsanexplicitdifferencewhenreceivingthetransversefield.Thisphenomenonhasnotbeenrevealedinpreviousreports.

  • 标签: 磁性材料 ISING模型 磁序
  • 简介:Thermodynamicpropertiesandphasediagramsofamixedspin-(1,2)Isingferrimagneticsystemwithsingleionanisotropyonhexagonalnanowirearestudiedbyusingeffective-fieldtheorywithcorrelations.Thesusceptibility,internalenergyandspecificheatofthesystemarenumericallyexaminedandsomeinterestingphenomenainthesequantitiesarefound.TheeffectoftheHamiltonianparametersonphasediagramsareexaminedindetail.Besidessecond-orderphasetransition,linesoffirst-ordertransitionandtricriticalpointsarefound.Inparticular,wefoundthatforsomenegativevaluesofsingle-ionanisotropies,thereexistfirst-orderphasetransitions.

  • 标签: HEXAGONAL ISING NANOWIRE mixed spin-(1 2)