一类解析函数的Fekete-Szeg ? 不等式

利用微分从属构造了解析函数类H(α,A,B)={f(z)∈H:(1-α)f(z)/z+αf'(z)(1+Az)/(1+Bz),z∈U},其中0≤α≤1,-1≤BA≤1,z∈U.利用施瓦兹函数的Fekete-Szeg ?不等式,得到了该函数类上的a_2及a_3-μa_2~2(μ∈C)的精确估计:a_3-μa_2~2≤(A-B)/(1+2α)max {1|,B+(μ(1+2α)(A-B))/((1+α)~2)},并给出了相应的极值函数,其结果推广了已有的结论.     

关于具有负系数和缺系数的算子解析函数类

设Vk(A,B,λ,μ)表示在单位圆盘U＝{z∶|z|＜1}内部解析且对于z∈U满足|[(1-λz)Hμp(z)-1]/[A-B(1-λz)Hμp(z)]|＜1的函数p(z)＝1-∑∞n=k|bn|zn(k=1,2,…)的类,其中-1≤B＜A≤1,0≤λ＜(A-B)/(1-B)≤1,μ＞-1,Hμp(z)＝(1)/((1-z)μ 1)*p(z)＝1-∑∞n=k((μ 1)...(μ n))/(n!)|bn|zn.c 1zc 1)∫z0tcf(t)dt,c＞-1的保持积分的算子类.     

2-循环相容次序阵的AOR迭代的收敛域

设A∈Cn×n是2-循环相容次序阵,其Jacobi阵J的非零特征值均为纯虚数.记α=ρ(J).本文证明了A的AOR迭代阵Lr,ω(约定ω》0,r≠0)收敛当且仅当参数ω,r满足条件0＜ω＜2/(1 α2),ω ω-2/α2＜r＜1/2[ω (2-ω)2/ωα2],r≠0,或等价地,{r≥rb,0＜ω＜2 rα2-α(r2α2 4r-4)/1 α2;rb≥r＞-2/α2,r≠0,0＜ω＜2 rα2/1 α2,其中rb=2/1 (1 α2).这一结果纠正了薛秋芳文给出的相应结果,并指出了其中的3个问题.     

B(H)上保持*-拟积的双射

设B(H)是维数大于1的复Hilbert空间H上有界线性算子全体得到的代数.?A,B∈B(H),定义拟积A°B=A+B-AB.证明?是B(H)上的双射且满足?(A*°B)=?(A)*°?(B),?A,B∈B(H)的充要条件是当dim H≥3时,存在H上的酉算子或共轭酉算子U使得?(A)=UAU*,A∈B(H);当dim H=2时,存在H上的酉算子U使得?(A)=UA_τU*,A∈B(H),其中τ是C上的环自同构.设A=(a_(ij))∈M_2,则令A_τ=τ(a_(ij)).     

自伴算子空间上保持Jordan积范数的映射

设H是复数域C上的Hilbert空间且dimH≥2,Bs(H)是H上所有自伴算子全体。设Φ是Bs(H)上的双射,如果Φ满足对任意A,B∈Bs(H),都有‖Φ(A)Φ(B)+Φ(B)Φ(A)‖=‖AB+BA‖,则存在一个酉算子或反酉算子U和泛函h:B(H)→{1,-1}使得对任意X∈B(H),有Φ(X)=h(X)UXU*。     

有关LUCAS序列的几个充要条件

Lucas序列Un(u)和Vn(u)定义为:U0=0,V0=2,U1=1,V1=u,Un=uUn-1-Un-2,Vn=uVn-1-Vn-2,n≥2.本文分别给出了同余式组 UN r(u)≡0 mod NVN r(u)(≠)2 mod N,UN r(u)(≠)0 mod NVN r(u)≡2 mod N和UN r(u)(≠)0 mod NVN r(u)(≠)2 mod N成立的几个充要条件,并对满足同余式组的u的个数进行估计,其中N=pq是两个奇素数之积,q=k(p 1) r,|r|＜(p 1)/(2),k≥7,((u2-4)/(p))=-1且gcd(u,N)=gcd(u2-4,N)=1.     

有界对称域上Hp,α空间的性质分析

在Cn中的有界对称域上继续分析了Hp,α空间上函数的性质,得到了两个定理.定理1设0＜α＜1,0＜p＜q＜∞,β＜(qα)/(p),λ＞0,若f∈Hp,α(Ω),那么∫10(1-r) nλ((α)/(p)-(β)/(q))-1Mq(r,f)λdr≤C‖f‖λp,α,这里C是与f无关的正常数.定理2设0＜α＜1,0＜p＜2,β＜(2α)/(p),若f(z)＝∑k,vakvφkv(z)∈Hp,α(Ω),那么,∑∞k=0(k+1)np((1+β)/(2)-(α)/(p))-n∑mkv=1|akv|p＜∞.     

混序的一个特征

设H是一个Hilbert空间, 一个大写字母表示H上的有界线性算子. T是一个有界线性算子, 若对(A)x∈H, 有(Tx,x)≥0,称T为正的,记为T≥0;若T≥0且T可逆,称算子T为严格正的, 记为T>0. 设A, B是严格正算子, 若log A≥log B, 则称A, B满足混序关系, 记为A>>B.     

用阿基米德滚刀加工渐开线齿形的原理误差计算

分析了阿基米德滚刀加工渐开线齿形的原理误差,推导出滚刀切削刃连续位置的包络线方程及齿形误差的计算式:θ=(nβ)/(Hcos αcos λ)r2sin2α+2r2ha+ha2-((ρnβ)/(Hcos αcos λ))2-1+cos-1((H)/(ρnβ)cos αcos λ)-α△fF=ρ{[(1)/(cos α)((nβ)/(Hcos λ)-(1)/(r2))r22sin2α+2r2ha+ha2]-[((ρnβ)/(Hcos αcos λ))2-1-((ρ)/(r2cos α))2-1]+[cos-1((H)/(ρnβ)cos αcos λ)-cos-1((r2cos α)/(ρ))]}所用的方法,也可用于其它齿形的范成法.     

关于Bergman加权移位算子的二次亚正规性

讨论了Bergman加权移位算子的二次亚正规性。在原有权序列α0:=x,αn:=(n+1)/(n+2)(n≥1)的基础上,得到一个新的加权序列α0:=x,αn:=(n+2)/(n+3)(n≥1),用以验证加权移位算子的二次亚正规性,得出Bergman加权移位算子的二次亚正规性与亚正规性是一样的。     

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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