关于Diophantine方程x~(d(n))+y~(φ(n))=z~(σ(n))

对于正整数n=2tpa11pa22…pakk,这里pi是奇素数,mi是正整数,i=1,2,…,k,2p1p2…pk,t是非负整数.设d(n),φ(n),σ(n)分别表示n的约数函数,Eu ler函数和约数和函数.给出了:n=2和3时,方程xd(n)+yφ(n)=zσ(n)正整数解的一般公式;并证明了ai(i=1,2,…,k)中至少有两个为奇数或存在i及奇素数p,使pi≡1(modp)且ai≡-1(modp)两种情形时,方程xd(n)+yφ(n)=zσ(n)没有正整数解.     

Euler商中的p次方幂

对于正整数n,设φ(n)和ω(n)分别是n的Euler函数和n的不同素因子的个数.对于适合a1以及gcd(a,n)=1的正整数a,形如(aφ(n)-1)/n的正整数称为Euler商.设p是奇素数,根据高次Diophantine方程的性质讨论了Euler商中p次方幂.证明了:当ω(n)≥3时,Euler商都不是p次方幂.     

关于两个数论函数的一个整除式

证明了对于正整数n,当2n且n≠2αpq(α∈N),ω(n)=3时,σ(n)=kφ(n)(k∈N且k≤4)无正整数解,其中p,q为不同的奇素数.     

关于方程Z(n)=φe(SL(n))的正整数解

基于广义欧拉函数φ_e(n)的计算公式,利用初等方法和技巧给出e∈{p~t,pq}时,方程Z(n)=φ_e(SL(n))没有正整数解的几个充分条件,其中p、q是不同的素数,t为正整数.最后对任意的正整数e,完全确定方程Z(n)=φ_e(SL(n))的全部正整数解.     

关于两类数论函数方程解的讨论

目的 研究方程S(SL(n^3))=φ(n)和S(SL(n^3))=φ_2(n)的可解性。方法 对于任意正整数 n , S(n),SL(n),φ(n)分别是Smarandache函数、Smarandache LCM函数和Euler函数,利用S(n),SL(n),φ(n)的基本性质结合初等的方法,推广了方程S(SL(n^3))=φ(n)。结果 给出并证明了上述方程的所有正整数解。结论 方程S(SL(n^3))=φ(n)有且仅有正整数解n=1,20,32,48,49,98。方程S(SL(n^3))=φ_2(n)有且仅有正整数解n=56,60,72,80,81,147,169,196,294。     

数论函数方程kφ(Y)=φ2(Y)+S(Y 8)的解

该文讨论了包含φ(n)、φ_e(n)与S(n)3个数论函数的方程kφ(Y)=φ₂(Y)+S(Y ⁸)的可解性.利用这3个数论函数的性质,得到了该方程只在k=1、2、4、5、9、11时有正整数解,并给出了其具体的正整数解,其中函数φ(n)是Euler函数,函数φ_e(n)是广义Euler函数,函数S(n)是Smarandache函数.     

Euler函数φ(n)与广义Euler函数 φ2(n)混合的两个方程

令φ(n)为Euler函数,φ_e(n)为广义Euler函数.讨论了Euler函数φ(n)与广义Euler函数φ_2(n)混合的两个方程φ_2(φ(m-φ_2(m)))=2与φ(φ_2(m-φ2(m)))=2的正整数解,利用分类讨论的方式及初等方法,分别得到了这两个方程各自的所有正整数解.     

数论函数方程tφ(n)+φ2(n)=S(SL(nk))的正整数解

设t∈N,n∈Z⁺,其中N和Z⁺分别是所有非负整数集合和所有正整数集合，利用欧拉函数φ(n)、广义欧拉函数φ₂(n)、Smarandache LCM函数SL(n)和Smarandache函数S(n)的性质以及初等数论的方法，得到了方程tφ(n)+φ₂(n)=S(SL(n¹³))只在t=0、1、2、3、4、5、7、10、13、15时有正整数解n及方程tφ(n)+φ₂(n)=S(SL(n¹⁸))只在t=0、1、3、6、7、9、14、18、19时有正整数解n,并给出了这两个方程的所有正整数解n。     

关于Diophantine方程x~(φ(n))-1=ny~2

对于正整数n,设φ(n)和ω(n)分别是n的Eluer函数和n的不同素因数的个数.利用高次Diophantine方程的性质,证明了当ω(n)≥3时,方程xφ(n)-1=ny2无正整数解(x,y).     

关于t-Euler优美数对的确定

设n为正整数,φ(n)是n的Eu ler函数,对于正整数a和b,如果存在正整数t使得φ(a)=b/t,φ(b)=a/t,则称(t,a,b)是一个t-Eu ler优美数对.用初等而简洁的方法讨论了t-Eu ler优美数对的存在性,并得到了全部的t-Eu ler优美数对只有(t,a,b)=(1,1,1),(2,2α,2α)及(3,2α.3β,2α.3β),其中α,β都是正整数.     

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     

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