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1.
基于河南省城市体系的人口数据提出在分形结构退化民政部下利用单对数型Lorenz曲线计算城市规模分布的Gini系数的方法之一:首先借助式∑kP(k)=A+Blink计算待定系数A、B然后云G=(A-B-BlnN-50)/50算出Gini系数G值,文章以实例说明了计算G值的程序。  相似文献   

2.
本文主要考察确定性k值随机微分方程(Ⅰ)dxt=Axtdt和关于H值C.B.m的随机微分方程(Ⅱ)dxt=AXtdt+G(Xt)dBt及(Ⅲ)dxt=AXtdt+G(Xt-Xt-τ)dBt(其中τ为充分小常量)的几种稳定性之间的关系  相似文献   

3.
证明了d2k=δ2k=d2k≥b2k,其中d2k、δ2k、b2k分别表示A(BMp)在lNg中的kolmogrov、线性、Bernstein型2k-宽度,d2k表示AT(BlNq′)在lMp′中Gel′fand型2k-宽度,这里A(BMp)={Ax:x∈AlMp,‖x‖p≤1},其中A是一个N×M的CVD矩陈(N>M=rankA,M是奇数),1p+1p′=1,1q+1q′=1(1≤q≤p<+∞,p≠1).  相似文献   

4.
G=(A,B;E)是偶图,|A|=|B|=n≥2,若e,f∈E,e≠f,有d(e)+d(f)≥3n+k(k≥1),则G中所有k个边的独立集M皆可扩张成G的1-因子。  相似文献   

5.
本文证明了当方程W(k)+Ak-1w(k-1)+…+A1W’+(A0+Ge)w=0的系数满足某种优势条件时,它的解的零点性质.由此,我们得到了该类方程复振荡的若干结果.该类方程已为众多研究者所研究.  相似文献   

6.
可交换厄米特矩阵乘积的特征值   总被引:3,自引:0,他引:3  
设A,B为n阶不定厄米特矩阵,且AB=BA;μi,γi及λi分别为A,B及AB依升序排列的特征值.给出的上界λk≤(μl-k+1-μ1)γl+μ1γ1(k=1,…,l)及下界λ≥(μk-l-μ1)γl+1+μ1γn(k=l+1,…,n)(其中l是B的负惯性指标)以及一系列结果改进了一般估计:min{μ1γn,μnγ1}≤λk≤max{μ1γ1,μnγn}.  相似文献   

7.
设R是一交换环,A∈Mn(R),定义A的指数和Drazin逆A^D,假设Ak=PBQ,k=ind(A),其中P,B,Q∈Mn(R),存在P’,Q’∈Mn(R),使得P‘PB=B=BQQ’若B有群逆,则A有Drazin逆当且仅当BB^#QAPB+I-BB^#可能,此时有A^D=PB(BB^#QAPB+I-BB^#)^-1Q。  相似文献   

8.
假设Aj(z)=Bj(z)ePj(z)(j=0,1,,k-1),Aj不全恒等于零,其中Bj(z)是亚纯函数,Pj(z)=aj,mjzmj++aj,0为非常数多项式,aj,q(q=0,1,,mj)为复常数,aj,mj0,并且满足(Bj)<degPj以及当ij时,deg(Pi-Pj)=max{mi,mj}(A0).且满足当mj=(A0)且argaj,mj=arga0,m0时,|aj,mj|<|a0,m0|.那么齐次线性微分方程f(k)+Ak-1f(k-1)++A0f=0的任一非零亚纯解f都满足(f)=.特别地,如果f(z)的极点重数一致有界,那么2(f) =(A0).  相似文献   

9.
在分析CGS算法的基础上,提出了采用两个相似的Bi-CG过程,利用Bi-CG过程的迭代中系数与迭代初值密切相关的特点,使其中一个Bi-CG的系数保证剩余向量与Krylov子空间Kk(A^T,r0)正交,百另一个Bi-CG过程的迭代系数使得剩余向量与Krylov子空间K^kk(A^T,S0)正交,构造出一种新的类似CGS方法的求解大型系数矩阵稀疏线性方程组的迭代算法,数值实验表明这种算法在一定程度上  相似文献   

10.
在算子B=x.d/dx作用下,欧拉方程xndny/dxn+P1x^n-1dn-1/dx^n-1+...+Pn-1xdy/dx+Pny=f(x),其中P1,P2,...,Pn为常数),可化为:(A^nB+P1A^n-1B+...+A^0B)y=f(x)。并简记为L(B)y=f(x),把B待定系数k,则L(B)=0即为欧拉方程的特征方程,从而可求出齐次方程的通解yH,再根据L(B)的逆算子性质求欧拉方程的特解yp=1/L(B)f(x),便求得欧拉方程的通解:y=yH+yp。  相似文献   

11.
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.  相似文献   

12.
何延凌 《科技信息》2008,(4):258-258
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.  相似文献   

13.
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。  相似文献   

14.
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.  相似文献   

15.
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-  相似文献   

16.
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-  相似文献   

17.
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  相似文献   

18.
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  相似文献   

19.
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  相似文献   

20.
<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  相似文献   

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