一个算术函数的误差项估计

设ψ(n)是Dedekind函数,∑n≤x=nψ(n)=αx E(x),其中α是常数,E(x)是误差项.主要目的是利用经典的复积分理论及解析方法研究了E(x)的平方积分均值,得到了一个较为精确的估计式.     

与Dedekind函数ψ（n）倒数有关的误差项的均值估计

设ψ（n)是Dedekind函数,则有∑n≤xn/ψ(n)=αx E(x),其中α是常数,而E(x)是误差项,主要目的是利用经典的复积分理论及解析方法研究E（x)的算术均值和积分均值,得到了一个较为精确的估计式。     

关于Tumura-Clunie定理的一个推广

给出Tumura-Clunie定理的一个推广.结果如下定理.设ω(z)是亚纯函数,F≡αxωn+αn-1ωn-1+…+α0满足lim →∞ r(+)E -N(r,1/F)+-N(R,ω)/T(r,ω) ＜1/2,那么 F =αn(ω+αn-1/nαn)n.     

具有δ函数势的Schroedinger方程的解和广义函数的乘积

本文证明了定义函数的乘积ε（x)δ(x)sinkx=0，利用这个结果我们证明ψ＝（1-c/2ε(x))sinkx是Schroedinger方程－d^2/dx^2 cδ(x)ψ=Eψ的解。     

具有椭圆性质的耗散非线性发展方程组解的渐近行为

讨论了如下具有椭圆性质的耗散非线性发展方程组Cauchy问题解的整体存在性和渐近行为ψt=-(1-α)ψ-θx+αψxx,θt=-(1-α)θ+υψx+2ψθx+αθxx,具有初值(ψ,θ),(x,0)=(ψ0(x),θ0(x))→(ψ±,θ±), x→±∞,其中α和υ是正常数且满足条件α＜1, υ＜α(1-α).     

具有δ函数势的Schrdinger方程的解和广义函数的乘积

本文证明广义函数的乘积ε(x)δ(x)sinkx=0。利用这个结果我们证明ψ=(1-(c/2)ε(x))sinkx是schrodinger方程-(d~2/dx~2)ψ cδ(x)ψ=Eψ的解。     

二维空间中耦合非线性Schrǒdinger方程组的孤立子波

在二维空间中研究了一类耦合非线性Scjrpedomger方程组的初值问题：{iФt r△Ф=α（p 1)|Ф|^p-1|ψ|^q 1Ф,iψt s△ψ=b(q 1)|ψ|^q-1|Ф|^q 1ψ,Ф(0,x)=Ф0(x),ψ（0,x)=ψ0(x)。通过定义一个极小化问题，利用变分法得出了具基态的孤立子的存在性，并证明了该孤立子的不稳定性．     

高维波动方程的Cauchy问题存在时间周期解的充要条件

讨论n维波动方程的Cauchy问题{utt-△u=0;t=0;u=ψ(x),ut=ψ（t) t∈R，x=(x1,x2,…，xn)∈R^n的解，何时为T－周期的，设上述问题的解为=u(x,t;φ，ψ），利用对部分变量作球平均的方法，籍助于归纳法，证明u(x,t;φ，ψ）为T－周期的充要条件是u(x,t;φ，0）与u(x,t;0,φ）均为T－周期的，并据此给出了在n=5,4时，为使u(x,t; φ，ψ）为T－周期的，初始数据φ与ψ应满足的充分必要条件。     

下级有穷整函数的一个缺项定理

研究Taylor展式有缺项的整函数的一个重要性质:设f(x)是一个下级有穷整函数.记M(r)=max/│z│=r│f(x)│,L(r)=min/│z│=r│f(x)│,若f(x)=1+∞/∑/n=1cnxλn 的残存指数序列λn(n=1,2,…)满足λn≥n(logn)(lon2n)1+η>0,则-/lim/r→∞logL(r)/logM(r)=1.     

一类带调和势Schroedinger方程组解的爆破

研究了一类带调和势Schroedinger方程组的初值问题{iФt r△Ф m|x|^2Ф|ψ|^2=a（j 1)|Ф|^j-1|ψ|^k 1Ф,iψt q△ψ n|x|^2ψ|Ф|^2=b(k 1)|ψ|^k-1|Ф|^j 1ψ，Ф（0,x)=Ф0(x),ψ（0,x)=Ф0(x),得出了该初值问题的解在有限时间内的爆破．     

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.     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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

正~~