简介:Theground-stateandthermodynamicpropertiesofquantummixed-spinchainsof1/2-1/2-1-1and3/2-3/2-1-1areinvestigatedbyaquantumMonteCarlosimulationwiththeloop-clusteralgorithm.For1/2-1/2-1-1chain,wefindithastwophasesseparatedbyanenergy-gapvanishingpointintheground-state.For3/2-3/2-1-1chain,thenumericalresultsshowtwoenergy-gapvanishingpointsisolatedbydifferentphasesinitsground-state.Ourcalculationsindicatethatallthesegroundstatephasescanbeunderstoodbymeansofvalence-bond-solidpicture,andthethermodynamicbehavioratfinitetemperaturesiscontinuousasafunctionofparameterα=J2/J1.
简介:证明了在场强为零势不为零的复连通区域,规范势沿粒子运动闭合路径的不可积积分是Berry几何相位。说明了由规范势构成的不可积相位因子中一部分是几何Berry相因子,并以电磁场为例说明规范场和相位因子的关系。因此不可积Berry相因子最完整地描述了与规范场有关的物理现象
简介:Inthispaper,thetwo-dimensionalMarcinkewiczintegralintroducedbySteinμ(f)(x)=(∫0x|∫|x-y|≤1|x-y|Ω(x-y)f(y)dy|2t-3dt)2isshowntobeofweaktype(1,1)andweightedweaktype(1,1)withrespecttopowerweight|x|"if-1<α<0,whereΩishomogeneousofdegree0.hasmeanvalue0andbelongstoLlog+L(S1).
简介:如果对一个简单图G的每一个与G的顶点数同奇偶的独立集I,都有G-I有完美匹配,则称G是独立集可削去的因子临界图.如果图G不是独立集可削去的因子临界图,而对任意两个不相邻的顶点x与y,G+xy是独立集可削去的因子临界图,则称G是极大非独立集可削去的因子临界图.本文刻画了极大非独立集可削去的因子临界图.
简介:Thereactionof1-phenyl-3-methyl-4-benzoyl-2,5-dihydro-1H-pyrazol-5-one(PMBP)andmethyldithiocarbazate(mdtc)inmethanolresultsinformationofayellowcrystallinesolid,adductof1-phenyl-3-methyl-4benzoyl-2,5-dihydro-lH-pyrazol-5-oneandmethyldithiocarbazate.Whentheyellowsolidsweredissolvedinamixtureofmethanolandether(1:4),aredcrystal,whichisanoxidationproductoftheformer,wasobtainedbyallowingsolventtoevaporateforafewdaysatroomtemperature.TheX-rayanalysisoftheredcrystalindicatesthatitisanoveldisulfidewithaspecialstructurelikea“U”conformationinthesolidstate.
简介:α-Aminonitrileswerepreparedefficientlyfromanodiccyanationofα-aminoester.Theeffectofdifferentsolventsandelectrolyteswasstudied.Theotherbyproductswereanalyzed.
简介:如果对一个简单图G的每一个与G的顶点数同奇偶的独立集1,都有G-I有完美匹配,则称G是独立集可削去的因子临界图.如果图G不是独立集可削去的因子临界图,而对任意两个不相邻的顶点x与y,G+zy是独立集可削去的因子临界图,则称G是极大非独赢集可削去的因子临界图.本文刻画了极大非独立集可削去的因子临界图.
简介:单个不可分的操作员g_(Ω,α),和Marcinkiewicz不可分的操作员μ_(Ω,α)被学习。操作符的内核象|y一样表现|~(-n-α)(α>0)接近起源,并且包含震荡的因素e~((i|y|)~(-β))(β>0)并且联合起来的范围S~(n-1)上的分发Ω。如果Ω与0
简介:随便取一个自然数,如果它是偶数,用2除它;如果它是奇数,将它乘3之后再加1,这样反复运算,最终必然得1.比如,取自然数N=6.6是偶数,先用2除,6÷2=3;3是奇数,要将它乘3之后再加1,3×3+1=10;按着上述法则往下做:10÷2=5;5×3+1=16;16÷2=8;8÷2=4;4÷2=2;2÷2=1.从6开始经历了3→10→5→16→8→4→2→1,最后得1.通过大量演算发现最后结果总是得1.于是数学家提出如下猜想:对于任一个自然数N,若N是偶数,就把它变成N2;若N是奇数,就把它变成3N+1.按照这个规则运算下去,最后必然得1.这个猜想到目前还没有人给予证明,不过日本东京大学的米田信
简介:Anecessaryandsufficientconditionofregularityof(0,1,…,m-2,m)interpolationonthezerosof(1-x)Pn-1α,β(x)(α>-1,β≥-1)inamanageableformisestablished,wherePn-1α,β(x)standsforthe(n-1)thJacobipolynomial.Meanwhile,theexplicitrepresentationofthefundamentalpolynomialswhentheyexist,isgiven.