三阶三点奇异半正边值问题的正解

利用锥拉伸锥压缩不动点定理 ,研究了三阶三点奇异半正边值问题x (t) - f(t,x) =0 ,　　　　t∈ (0 ,1 ) ,x(0 ) =x′(η) =x″(1 ) =0。正解的存在性。其中 12 <η<1 ,f(t,x)在t=0和t=1处有奇异 ,在某些t和x处 f(t,x)可能为负值     

奇异半正定二阶边值问题的正解存在性

借助于锥上的不动点指数理论研究奇异半正定二阶边值问题-x″(t)=f(t,x)(0相似文献   

二阶三点奇异边值问题正解的存在性

应用锥上的不动点指数理论,讨论二阶奇异微分方程边值问题x"(t)+f(t,x(t)), x'(t)=0, 0＜t＜1,δx(0)=γx'(0),x(1)=αx(η),0＜α＜1,0＜η＜1,δ＞0,γ≥0,正确的存在性.其中f(t,x,y)在x=0奇异.     

具有可变号且与px′有关的非线性项的奇异边值问题的无界正解

应用锥上的不动点指数理论,讨论二阶奇异微分方程边值问题{1/(p(t))(p(t)x′(t))′+φ(t)f(t,x(t),p(t)x′(t))=0, 0＜t＜1;limt→0p(t)x′(t)=x(1)=0,正解的存在性.其中f(t,u,z)可变号,∫10(1)/(p(t))dt=+∞,并且在u=0,z=0奇异.     

非线性奇异四解边值问题的正解

利用锥理论和不动点指数理论,在有关线性算子方程对应的第一特征值的条件下研究了奇异四阶边值问题X(4)(t)=ψ(t)f(x(t)),0相似文献   

一类奇异二阶微分方程对称正解的存在性

利用锥拉伸与压缩不动点定理得到了一类奇异二阶两点边值问题对称正解的存在性结果,非线性项f可以在t=0,1和x=0奇异.     

n阶非线性两点奇异边值问题单调正解的存在性

利用锥拉伸与压缩不动点定理,讨论n阶奇异边值问题{x(n)(t)+λα(t)f(t,x(t))=0,t∈(a,b),x(a)=x″(a)=…=x(n-1)(a)=0,x′(b)=0非减正解的存在性,其中λ>0是常数,α∈C((a,b),R+), f∈C([a,b]×(0,∞),R+),R+是正实数集,α(t)可以在t=a,b 处奇异,f(t,s)可以在s=0处奇异.     

Banach空间中二阶奇异边值问题的特征值问题

通过建立一个特殊的锥和运用不动点指数理论,在Banach空间中讨论二阶奇异边值问题{-μx″=f（t,x）,t∈（0,1）,x（0）=x（1）=θ。的特征值问题。     

奇异超线性三阶三点边值问题的两正解存在性

近年来,奇异非线性多点边值问题被广泛研究,然而,涉及奇异超线性问题的工作相对较少,关于此类问题多个正解的存在性的工作更为少见,本文研究了三阶三点奇异边值问题(E){xm=f(t,x) x0=x'(η)=x"(1)=0 0＜t＜1 η∈(1/2,1)的多个正解的存在性,通过格林函数的性质和一个锥上的不动点定理证明:如果非线性项f在∞处为超线性的,并且在t=0,t=1,u=0 处是奇异的,则上述问题至少存在两个正解.     

奇异半正定高阶共轭边值问题多个正解的存在性

利用锥上的不动点指数理论和Lebesgue控制收敛定理研究高阶奇异共轭边值问题(-1)n-kx(n)(t)=f(t,x(t)),0相似文献   

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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