简介:摘要院未来战争的复杂性决定了运用作战仿真的方法来研究战争是必要的。本文首先介绍了兰彻斯特方程和EINSTein仿真实验平台两种作战仿真方法,之后,运用EINSTein仿真实验平台对兰彻斯特方程模型进行了仿真实验的验证,验证结果表明了运用计算机作战仿真软件和传统的兰彻斯特数学模型来模拟战争的一致性。
简介:THEGENERALIZEDEINSTEINRELATIONONACOMPACT ORIENTABLERIMANNIANMANIFOLDFangHaito(方海涛);GongGuanglu(龚光鲁)(DepartmentofAppliedMathem...
简介:Inthisarticle,theauthorsconsiderthecollapsesolutionsofCauchyproblemforthenonlinearSchrdingerequationiψt+1/2△ψ-1/2ω2|x|2ψ+|ψ|2ψ=0,x∈R2,whichmodelstheBose-Einsteincondensatewithattractiveinteractions.Theauthorsestablishthelowerboundofcollapserateast→T.Furthermore,theL2-concentrationpropertyoftheradiallysymmetriccollapsesolutionsisobtained.
简介:介绍了如何从某种形式的度规出发,利用Mathematica软件计算联络,Ricci张量和总曲率,最终写出了真空Einstein场方程,并在附录中给出了相应的Mathematica程度,它可有效地协助用户进行与广义相对论有关的理论,观测研究。
简介:介绍了如何从某种形式的度规出发,利用Mathematica软件计算联络、Ricci张量和总曲率,最终写出了真空Einstein场方程。并在附录中给出了相应的Mathematica程序,它可有效地协助用户进行与广义相对论有关的理论、观测研究。
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简介:TheentanglemententropyofanacousticblackholeinaBose–Einsteincondensates(BEC)isderived,whichisassociatedwiththephononsgeneratedviatheHawkingmechanisminasonichole.ConsideringthedispersionrelationofaBEC,werecalculatetheentanglemententropyoftheacousticblackholebymeansofstatisticalmethodintwolimits.Wefindthattheentropyisstillproportionaltotheareaofeventhorizon,butwithacoefcientdependentontheinfraredcutof.
简介:WeobtainsolitonandplanewavesolutionsforthecouplednonlinearSchr?dingerequations,whichdescribethedynamicsofthethree-componentBose-EinsteincondensatesbyusingtheHirotamethod.Meanwhilewefindthatthesystemwhichhasattractiveatomicinteractionwillonlypossessashapechanging(inelastic)collisionpropertyduetointensityredistributionintheabsenceofthespin-exchangeinteraction.Asadiscussedexample,weinvestigatetheone-soliton,two-solitonsolutionsandcollisionaleffectsbetweenbrighttwo-soliotnsolution,whichleadtotheintensityredistribution.
简介:Inthereportwepointoutthatthereexistsanintrinsicdifferenceintheinternalsymmetryofthetwocomponentsspin-1/2BosecondensatesfromthatofspinorBosecondensatesoftheatomswithhyperfinestatesofnonzerointeger-spins,whichgivesrisetoanewtopologicalconstrainonthecirculationforthistwo-componentspin-1/2Bosecondensates.ItisshownthattheSU(2)symmetryofthespin-1/2Bosecondensateimpliesa
简介:探讨了Taud度规下,复标量场的Einstein-Klein-Gordon方程的“平面波”解。
简介:Weproposeanewmeasurementschemefortheatom-moleculedarkstatebyusingelectromagneticallyinducedtransparency(EIT)technique.Basedonadensity-matrixformalism,wecalculatetheabsorptioncoefficientnumerically.TheappearanceoftheEITdipinthespectraprofilegivesclearevidenceforthecreationofthedarkstateintheatom-moleculeBose-Einsteincondensate.
简介:ForBose-Einsteincondensationofneutralatomsinanisotropictrapsatzerotemperature,wepresentsimpleanalyticalmethodsforcomputingthepropertiesofgroundstateandsinglevortexofBose-Einsteincondensates,andcomparethoseresultstoextensivenumericalsimulations.Thecriticalangularvelocityforproductionofvorticesiscalculatedforbothpositiveandnegativescatteringlengthsa,andfindananalyticalexpressionforthelarge-Nlimitofthevortexcriticalangularvelocityfora>0,andthecriticalnumberforcondensatepopulationapproachesthepointofcollapsefora<0,byusingapproximatevariationalmethod.