一类含有梯度项的奇异抛物方程古典解的存在性

研究了一类含有梯度项的奇异型抛物方程. 在一定条件下, 通过抛物正则化方法及上下解方法, 获得了该问题的古典解, 证明了这个解在边界点处的一阶导数为0. 而且,证明了某些奇异问题古典径向解的存在性.     

一类奇异抛物方程非负古典解的存在性

一类含梯度项的奇异抛物方程在文中得到了讨论.在某些特定条件下,通过抛物正则化方法及上下解方法,作者获得该类方程的非负古典解的存在性.     

一类奇异抛物方程古典解的存在性及其渐近行为

研究了一类有界光滑区域上的奇异抛物方程.运用抛物正则化及上下解方法,证明了古典解的存在性.同时,讨论了当λ→∞时解的渐近行为.     

一带时滞的退化奇异抛物型方程的熄灭

本文考虑了一带时滞的退化奇异抛物型方程的熄灭问题.通过使用正则化方法和上下解技巧,我们得到了该问题存在唯一古典解的结论.并且对q≥0,通过寻找一个特殊的上解和利用特殊特征值问题的第一特征值及其对应的特征函数性质,获得了上述问题解的整体存在和熄灭的充分条件.与此同时,我们还获得了q≥0时解的熄灭时间T和临界长度a*的简单估计.     

人口问题中一般扩散模型的径向对称解

研究四阶非线性抛物方程初边值问题的径向对称解. 采用抛物正则化方法, 借助Campanato空间框架和一致Schauder型估计, 得到了正则化问题古典解的存在性, 并基于正则化问题解的一些必要一致估计, 证明了弱解的存在性.     

一类最优投资理论的数学模型

考虑一类最优投资理论的数学模型, 该类数学模型可以归结为一个抛物型Monge Ampère方程的混合定解问题. 将连续性方法与解的先验估计相结合, 建立了相关方程混合初边值问题古典解的存在唯一性.     

光滑无边紧流形上的线性抛物方程

用半群方法证明光滑无边紧流形上线性抛物方程的广义解的存在性 ,并通过讨论解的正则性 ,得到古典解的存在惟一性及 Schauder型先验估计 .     

抛物型Hessian方程的第三初边值问题

给出了一类抛物型Hessian方程第三初边值问题解的情况.在一定条件下,利用辅助函数和闸函数得到了上述问题严格凸解的先验估计结果,进而利用连续性方法得到了所述问题严格凸古典解的存在唯一性.     

某种更一般形式的抛物型Monge-Ampère方程

对于Caffarelli-Nirenberg-Spruck提出的一种更一般的椭圆型Monge-Ampère算子, 讨论了相应的抛物型Monge-Ampère方程第一初边值问题, 证明了古典解的存在惟一性, 推广了Ladyzhenskaya-Ivochkina关于相应抛物型Monge-Ampère方程的结果.     

奇异线性抛物问题的时空有限元方法

讨论了一类奇异线性抛物方程的自适应有限元方法,即时间间断、空间连续的间断时空有限元方法.以对偶问题的强稳定性和误差估计为基础,给出了有限元解的加权L2模误差估计.     

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

正~~