关于Neuman-Sándor平均的两个最佳不等式

运用实分析方法,研究了Neuman-Sándor平均M(a,b)与第二类反调和平均D(a,b)和调和根平方平均H(a,b)(及调和平均H(a,b))凸组合的序关系.发现了最大值λ_1,λ_2∈(0,1)和最小值μ_1、μ_2∈(0,1)使得双边不等式λ_1D(a,b)+(1-λ_1)H(a,b)M(a,b)μ_1D(a,b)+(1-μ_1)H(a,b),λ_2D(a,b)+(1-λ_2)H(a,b)M(a,b)μ_2D(a,b)+(1-μ_2)H(a,b)对所有a,b0且a≠b成立.     

单调增加的连续函数的Picard迭代序列的收敛定理

证明了若f:[a,b]→[a,b]为单调增加的连续函数,λ∈(0,1),定义Fλ:[a,b]→[a,b],Fλx=(1-λ)x+λf(x),x1∈[a,b],xn+1=Fλxn=Fλnx1,n≥1,则{xn}单调地收敛于f的1个不动点.     

适合λ~2+aλ+b=0的方阵相似于若当标准形的一个简单证法

在高等代数中有这样一个性质:设n阶矩阵A适合方程λ~2+aλ+b=0(a,b是任意复数)则 (ⅰ) 当a~2-4b≠0时,A相似于矩阵 (1) 此处λ_1,λ_2是λ~2+aλ+b=0的两个根,γ=秩(A-λ_2I_n); (ⅱ)当a~2-4b=0时,A相似于矩阵此处λ_1是λ~2+aλ+b=0的二重根,γ=秩(A-λ_1I_n); (ⅲ)如果A又是厄米特矩阵时,A酉相似于矩阵(1)     

关于SL问题的第一特征值的下界讨论

考虑SL问题-γ″＋qy=λy,x∈[0,1],边界条件为γ（0）=0,γ′（1）/γ（1）=aλ＋b,我们得到当q≥0,a〉0,b〈1时,上述问题的特征值全大于零。     

向量值有理插值函数的递推算法

针对向量连分式序列Rn(x)=bo x-xo/b1 … x-xn-x/bn,n=0,1,2,…利用向量的Samelson逆，建立了类似于标量逐步有理插值算法的向量有理函数插值的逐步递推算法：Pλ=dλ,λPλ-1 ∑λ-1 i=1wi^λdλ-i,λPλ-i-1 (x-xλ-1)^2Pλ-2 ωλ^λBλ,Qλ=dλ,λQλ-1 ∑λ-1i=1wi^λdλ-i,λQλ-i-1 (x-xλ-1)^2Qλ-2,λ=2,3,…，n（＊） 其中{P0=b0,Q0=1;{P1=d1,1P0 ω1^1b1,Q1=d1,1Q0,Rλ(x)=Pλ(x)/Qλ(x)(λ=0,1,…，n)是满足插值条件Rλ（xi))=Rλ(xi)Qλ(xi)=Vi,i=0,1,…，λ 的向量有理函数，与向量与理函数插值的传统算法相比，上述算法的主要优点是具有承袭性；当需要增加一个插值条件Rn 1(xn-1)=Vn 1时，原来已经得到的向量有理插值函数序列P0／Q0，P1／Q1，…，Pn/Qn仍然保留，只要按（＊）式再计算一个Pn 1(x),Qn 1(x)即可。在此基础上，将上述算法推广到二元情形，数值实例验证了所给算法的有效性。     

（b,d）型A,P,间隙与模分布

本文主要证明了下述定理: 设f(z)=sum from n=0 to∞a_nz~(λ_n)为一超越整函数,那么: (1)当f(z)具有(b,d)型A.P.间隙时,对任一有穷复数a,都有δ_s(a,f)≤1-1/d;当b>0时,还有:sum from a≠∞ to δ(a,f)≤1-1/d。 (2):当λ_(m+1)-λ_m(m=n,n+1,…)的最大公因子d_n→∞(n→∞)时,对在一慢增长的亚纯函数a(z),都有:_s(a(z),f)≤1/2。     

一类带饱和项互惠模型平衡态正解的存在性

研究了一类两个物种同时带有饱和项的互惠模型在第一边界值条件下的平衡态正解的存在性．首先用单调解的方法给出了此解的先验估计，然后利用局部分歧理论研究了在λ1-c〈a〈λ1和a〉λ1两种情况下模型分别在两个半平凡解上出现的局部分歧现象，并证明了分别在分歧点（β，0，θβ）和（b＇，θa，0）附近存在正解；最后利用全局分歧理论研究了其整体分歧，从而证明了这两种情况下模型存在平衡态正解．     

奇异Dirichlet问题解的最佳逼近

在区间I =[0 ,b]与球域Ω ={x∈RN,N〉 1:|x |〈b}上 ,对a〉 1,构造出奇异问题-△u =λua ,u〉 0 ,x∈Ω ,u| Ω=0的精细逼近解 .其中在区间上的逼近解为最佳 ,即当a =3时 ,精确解是u =[λb2 ]1a +1[x(b -x) ]2a +1;而在球域上的逼近解是几乎最优的 .这里λ〉 0为参数 .     

一类合作型拟线性椭圆方程组多个解的存在性

利用Ekeland's变分原理和山路引理,考虑合作型拟线性椭圆系统-Δpu=λa(x)|u|p-2u+λ/β+1b(x)|u|α|v|βv+Fu(x,u,v),x∈Ω;-Δqu=λc(x)|v|q-2v+λ/α+1b(x)|u|α|v|βu+Fv(x,u,v),x∈Ω;u=v=0,x∈Ω在参数λ从左边无限接近于相应的非线性特征值问题的第一个特征值λ1时,系统有3个非平凡解.     

(b,d)型A.P.间隙与模分布

本文主要证明了下述定理: 设f(z))=sum from n=0 to ∞ a_nz~(λn)为一超越整函数,那么: (1)当f(z)具有(b,d)型A.P.间隙时,对任一有穷复数a,都有δ_ε(a,f)≤1-1/d;当b>0时,还有:sum from α≠∞δ(a,f)≤1-1/d。 (2):当λ_(m 1)—λ_m(m=n,n 1,…)的最大公因子d_n→∞(n→∞)时,对在一慢增长的亚纯函数a(z),都有:■_s(a(z),f)≤1/2。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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