烷烃沸点和其分子结构图的关系

分析烷烃沸点和其结构的关系,导出求算烷烃沸点的经验公式lgT=0.1707lg(w+3△p-m)+2.2677式中,w,p为Wiener指数,m为ω—CH_3数。     

高阶摄动波动方程解的L^p—L^p′估计

研究了高阶摄动波动方程 ttu+ (-Δ) mu+V(x)u =0 ,u(x ,0 ) =0 , tu(x ,0 ) =f(x) ,x ∈Rn,n >3m ,解的Lp -Lp′ 估计 在摄动和始值 f(x)为紧支且V(x)充分小的假定下 ,得到了该问题解的Lp-Lp′ 估计 :‖u(· ,t)‖p′ ≤Ct-d‖f‖p,t >0 ,其中m >1,d =n/m (1/p- 1/p′) - 1,1/p+ 1/p′=1,m /(2n) <1/p- 1/2 相似文献   

一类含有调和数的同余式（英文）

该文目的是创建一系列含有调和数的同余式.当p3为一素数时,利用已有的组合恒等式和同余式,得到了如下的同余式:∑p-1k=1k~2H_k~2≡79/108p-4/9(mod p~2)和∑p-1k=1H_k~3≡23/18(mod p).同时也得到了∑(p-1)/2k=1H_k~2/k≡-8/3q_p~3(2)+1/6B(p-3)(mod p)和∑(p-1)/2k=1H_(2k)~2≡-1+1/2q_p~2(2)(mod p),这里Bn(n∈N)称为Bernoulli数,当pa时,q_p(a)=(a~(p-1)-1)/p称为Fermat商.     

高阶摄动波动方程解的Lp-Lp′估计（英文）

研究了高阶摄动波动方程ttu+(-Δ)mu+V(x)u=0,u(x,0)=0,tu(x,0)=f(x),x∈Rn,n>3m,解的Lp-Lp′估计.在摄动和始值f(x)为紧支且V(x)充分小的假定下,得到了该问题解的Lp-Lp′估计:‖u(*,t)‖p′≤Ct-d‖f‖p,t>0,其中 m>1,d=n/m(1/p-1/p′)-1,1/p+1/p′=1,m/(2n)<1/p-1/2相似文献   

从任意2n—1个整数中必可选出n个使其和为n之倍数

柯召、孙琦提出了如文题所述的猜测.单墫证明了这一猜测.本文的目的是用初等方法证明这一猜测.定理1.p 为素数,从任给2p-1个整数中必可选出 p 个使其和为 p 之倍数.证:任给2p-1个整数 a_1,a_2,…,a_2p-1.从中选出 p 个作和.共有 C_(2p-1)~p=C_(2p-1)~(p-1)个和:S_1=a_1+a_2+…+a_p,S_2=a_1+a_2+…+a_(p-)+a_(p+1)     

醛酮的沸点及其分子结构图

从分子醛、酮的分子结构入手，导出了醛、酮的沸点与其发子结构的关系：1gT=0.13241lg(W 2p 2n-2α-1.5ω）＋2.3729式中T为一元脂肪族醛、酮的沸点（K）；W为Wiener径为指数；p=P-P′，P，P′分别为醛、酮及其同碳原子数的直链醛、酮的极性指数；n等羰碳原子上的烷 基数减1；α等于碳原子上的烷基数减1；ω为ω碳原子上的取代基数。     

应用通项公式探索法数列之和

通项公式a_n=f(n)在特殊数列求和中有着很重要作用,利用它求某些特殊数列之和,往往事半功倍。 如:S_n=1+(1+2)+(1+2+3)+…+(1+2+3+…+n) a_n=1+2+3+…+n=(n(n+1))/2=n~2/2+n/2 相加得: S_n=1/2(1~2+2~2+3~2…+n~2)+1/2(1+2+3+…+n), 当然S′_n=1~2+2~2+…+n~2=1/6n(n+1)(2n+1) S_n=1/2·1/6n(n+1)(2n+1)+1/2·n(n+1)/2=1/12n(n+1)(2n+1+3)=1/12n(n+1)(2n+4)=1/6n(n+1)(n+2) 再如:S_n=1+1/(1+2)+1/(1+2+3)+…+1/(1+2+3+…+n)     

关于丢番图方程x~3±27=py~2

利用初等方法得出了:p=3(3k+1)(3k+2)+1(k≡1,2(mod4))为奇素数时,丢番图方程x3+27=py2无正整数解;p=3k(k+1)+1≡1(mod8)(n≡k(mod 13))为奇素数时,丢番图方程x3-27=py2无正整数解.     

默森尼质数的判别法及其构造

得到默森尼 (Mersenne)数为质数的判别法和构造 ,当Mp=2 p- 1为合数时其因数的特征及其因数个数的估计。(1)Mp=2 p- 1为质数的充要条件是 Mp2kp + 1≡ 0　 (mod p)(2 )如果Mp=2 p- 1且Qi|Mp　i=1,2 ,……T那么 12     

在RN上的拟线性椭圆型方程正解的存在性

研究了以下非线性Dirichlet问题在一定条件下的弱正解的存在性-div(|(△)u|p-2(△)u)+a(x)up-1=h(x)uq+up*-1,x∈RN,u≥0,u0,∫RN?a(x)*|u|pdx＜+∞.其中,aRN→R是连续非负函数,hRN→R是某类可积函数,2≤p＜N且p2≤N,0＜q＜(p2(p-1))/(N-p)-1,p*=(Np)/(N-p).从而在更弱的条件下将p=2或次临界指数的情形推广到P-Laplacian及临界指数的情形,同时推广了a(x)=0时的某些结果.     

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     

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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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has