一类具有Robin边界条件的多方渗流牛顿方程解爆破时间的下估计

本文研究类具有Robin边界条件的多方渗流牛顿方程解问题.利用一阶微分不等式技巧,我们获得了此问题爆破时间的一个下估计.     

一类非线性抛物方程解的爆破时间估计

主要研究带有第三界边界条件的非线性抛物方程解的爆破现象,建立一系列微分不等式,给出了爆破时间的下界估计,最后给出了方程解不爆破的条件.     

具有空变系数和吸收项的抛物方程解的爆破分析

研究了一类高维非局部抛物方程解的爆破现象.运用微分不等式技巧,得到了高维空间上非线性边界条件下具有空变系数和吸收项的抛物方程全局解的条件.进一步,通过构造能量表达式,运用Sobolev不等式和其他微分不等式技巧,推出了当爆破发生时解的爆破时间上界和下界估计.     

一类具非局部边界条件抛物方程解的爆破模式

考虑一类具非局部边界条件抛物型方程解的爆破模式.借助一些积分不等式,通过适当弱化关于初值的假设条件,得到了正解的全局爆破性质及爆破速率估计.     

弱耦合 Schrödinger 方程组的稳定性

本文旨在研究弱耦合 Schrödinger 方程组的稳定性问题. 为此, 我们首先建立了关于弱耦合椭圆方程组的内插不等式. 基于此, 我们得到了耦合 Schrödinger 方程组的预解式估计，进而得到了相应的稳定性结果.     

一类具有非齐次Neumann边界条件的半线性热方程解的爆破现象

作者研究了一类具有非齐次Neumann边界条件的半线性热方程解的爆破现象.通过构造一阶微分不等式,作者得到了爆破时间的上界.另外,作者还得到了方程解爆破的充分条件.     

一类具有非线性边界条件的非线性抛物方程解的爆破现象(英文)

研究一类具有非线性边界条件的非线性抛物方程解的爆破现象.建立了方程解有限时间爆破和全局存在的一些条件.另外,当解发生爆破时,通过构造一阶微分不等式,得到爆破时间的下界.     

非齐次非对称波动方程的Strichartz估计

通过研究齐次非对称波动方程的解,应用Duhamel’s原理,得到非齐次非对称波动方程柯西问题的形式解.与此同时,借助Hardy-Littlewood-Sobolev与lderoH??不等式,给出这类非齐次方程解的Strichartz估计.     

带有耗散梯度函数的抛物方程爆破与有效性分析

通过建立合适的Sobolev型不等式, 解决一类混合边界条件下含有耗散梯度函数的抛物方程解的爆破问题, 当问题解发生爆破时, 使用两种方法得到了其爆破时间的下界估计, 并给出这些方法的有效性分析.     

带有耗散梯度函数的抛物方程爆破与有效性分析

通过建立合适的Sobolev型不等式, 解决一类混合边界条件下含有耗散梯度函数的抛物方程解的爆破问题, 当问题解发生爆破时, 使用两种方法得到了其爆破时间的下界估计, 并给出这些方法的有效性分析.     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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