简介:Inthispaper,analmostP-stabletwo-stepsixth-orderHybridmethodwithphase-lagoforderinfinityandaclassexpliciteighth-orderObreckoffmethodswithphase-lagoforder10-24aredevelopedforthenumericalintegrationofthespecialsecond-orderperiodicinitial-valueproblems.Thesemethodshavetheadvantageofhigheralgebraicorderandconsiderablysmallerphase-tagcomparedwithsomemethodsin[1-6].Numericalexamplesindicatethatthesenewmethodsaremoreaccuratethanmethodsdevelopedby[1-6].
简介:一个新上面、更低的答案理论为第二个顺序问题(G'(y))被介绍“+f(t,y)=0在有限、无限的间隔上。有限间隔上的理论基于一种Leray鈥揝chauder选择,而无限的间隔上的理论在有限间隔和一个diagonalization过程上基于结果。关键词上面、更低的答案-无限的间隔-diagonalization过程-Leray鈥揝chauder选择先生(2000)题目分类34B15-34B18-34B40由捷克的共和国的资助机构和捷克的政府J14/98:153100011的委员会的资助号码201/01/1451支持了
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简介:Wepresenttheextendedhydrogenatomandmonopole-hydrogenatomtheorythroughgeneralizingtheusualhydrogenatommodelandwithamonopolemodelrespectively,inwhichY(sl(2))algebrasarerealized.WederivetheHamiltoniansofthetwomodelsbasedontheY(sl(2))andthegeneralizedPauliequation.TheenergyspectraofthesystemsarealsogivenintermsofYangianalgebraandquantummechanics.
简介:NewrareearthvanadatesYSrQ-xCaxV3O9-y(x=0.0,0.67,1.0,1.33and2.0)havebeensynthesizedbyanewsimplemethod.X-raypowderdiffractionresultsshowthattheyaremono-phase.Theybelongtoorthorhombicstructureandtheirlatticeconstantsarecalculated.TheresultsofweightgainsinTGcurvesshowthatthelowervalentvanadiumisoxidizedtohighervalentstateathighertemperature.Theoxygencontentsofnewcompoundsarecalculatedfromtheweightgains.BothV3+andV4+coexistinYSr2-xCaxV3O9-y.Thesecompoundsexhibitlowelectricresistivityatroomtemperature.
简介:为它的高氧化抵抗,钇硅酸盐是为在在1600°C上面的温度的carbon-fiber-reinforcedcomposites的保护的涂层的一个重要候选人。一个新奇方法,由一起沉淀组成,弄干水花,热处理和plasma-densification,被开发准备Y2SiO5粉末为热喷洒。作文,形态学和综合Y2SiO5粉末的流动能力被XRD,SEM和霍尔流量计分别地调查。结果证明综合Y2SiO5粉末与高纯净是将近球形的。分别地,Y2SiO5粉末的明显的密度和流动能力是1.87g/cm3和37s/50g它为大气的血浆喷洒导致多达80%的高免职效率。
简介:ForquadraticnumberfieldsF=Q(√2pl…pt-1)withprimespj≡1mod8,theauthorsstudytheclassnumberandthenormofthefundamentalunitofF.TheresultsgeneralizenicelywhathasbeenfamiliarforthefieldsQ(√2p)withaprimep≡1mod8,includingdensitystatements.Andtheresultsarestatedintermsofthequadraticformx2+32y2andillustratedintermsofgraphs.
简介:Inthispaper,theoutputquantumcorrelationsofthreefieldsinteractingwithinvertedY-typeatomsinsideathree-modecavityareinvestigated.Bynumericallycalculatingthestationarynoisespectraofthefields,weshowthatitispossibletogeneratethegenuinetripartitecontinuousvariableentanglementoutsidethecavitybycoherentlypreparingtheatomsinasuperpositionoftheupperexcitedstateandtwogroundstatesinitially.Ournumericalresultsdemonstratethatbothzerofrequencyentanglementandsidebandfrequencyentanglementcanbeobtainedunderdifferentinitialcoherentconditions.Inaddition,weinvestigatethethermalfluctuationeffectsonthequantumentanglement.Itisfoundoutthattheentanglementoccurringinahighfrequencyregimeismorerobustagainstthermalnoisethanthezerofrequencyentanglement,whichmaybeusefulforquantumcommunication.
简介:TheelectronicpropertiesandtopologicalphasesofThXY(X=Pb,Au,Pt,PdandY=Sb,Bi,Sn)compoundsinthepresenceofspin–orbitcoupling,usingdensityfunctionaltheoryareinvestigated.TheThPtSncompoundisstableintheferromagneticphaseandtheotherThXYcompoundsarestableinnonmagneticphases.Bandstructuresofthesecompoundsintopologicalphases(insulatorormetal)andnormalphaseswithingeneralizedgradientapproximation(GGA)andEngel–Voskogeneralizedgradientapproximation(GGAEV)arecompared.TheThPtSn,ThPtBi,ThPtSb,ThPdBi,andThAuBicompoundshavetopologicalphasesandtheotherThXYcompoundshavenormalphases.Bandinversionstrengthsandtopologicalphasesofthesecompoundsatdifferentpressurearestudied.Itisseenthatthebandinversionstrengthsofthesecompoundsaresensitivetopressureandforeachcompoundasecond-orderpolynomialfittedonthebandinversionstrengths–pressurecurves.