一类具有非局部源的退化抛物方程组解的整体存在和有限爆破

讨论了一类具有非局部源的退化抛物方程组:u1=vp2(△u+bum2∫Ωvq2 dx),vt=up2(△v+bvm2∫Ωuq2 dx)在Diriclet边界条件下解的爆破现象.通过运用比较原理和上、下解方法,建立了该方程组解的整体存在和有限爆破的充分条件.     

一类含非局部源和非变分形式的椭圆型方程组正解的存在性

本文研究一类含非局部源的椭圆型方程组{-A(∫Ω|u|kdc)△pu=λvm∫Ωuαvβdx,x∈Ω -B(∫Ω|v|sdx)△qv=μun∫Ωuγvδdx,x∈Ω (0.1)并且带有Dirichlet零边界条件的正解存在性.这里Ω是RN,N≥1中的有界区域,边界( 6)Ω光滑.为了得到它的解,我们先考虑与之相应的局部椭圆型方程组-△pu=λvm,-△qv=μuninΩ;u=v=0,on (6)Ω (2)正解的存在性.我们将应用上下解方法得到问题(1)和(2)的解.     

具变指标的耦合抛物系统解的爆破行为

考虑了含有变指标的耦合抛物系统ut=△u+∫Ωvp(x)dx,vt=△v+∫Ωuq(x)dx非负解的爆破性质。使用上下解方法和特征函数方法,得到了其齐次问题非负解整体存在和有限时刻爆破的充分条件。     

关于一类含自然增长条件的变分不等式

该文讨论如下的含自然增长条件的变分不等式:求u∈K∩L~∞(Ω),使得∫_Ωa_(αβ)(x,u)D_αuD_β(v-u)dx+1/2∫_Ω(v-u)D_ua_(αβ)(x,u)D_αuD_βudx≥0,?v∈K∩L~∞(Ω)其中K={v∈H~(1,2)(Ω),v≥Ψa.e.于Q,v|?Ω=u_0},得到了其解的存在性。     

非局部抛物方程组解的一致爆破及边界层估计

研究了带有非局部反应项的抛物方程组ut－Δu=∫Ωu^α₁dx∫Ωv^β1dx,vt－Δv=∫Ωu^α2dx∫Ωv^β2dx解的性质，给出了爆破解的一致爆破模式和边界层估计.     

可压缩磁流体方程组整体弱解的不存在性

在RN,N≥2中研究了可压缩磁流体方程组整体弱解的不存在性.在密度、速度和磁场满足一定的积分条件下,如果初值满足∫RNρ0 (x) v0(x)x/｜x｜[∫｜x｜0w(r) dr]dx≥0,那么整体弱解中的密度和磁场都是零解;如果初值满足∫RNρ0(x)v0(x)x/｜x｜[∫｜x｜0w(r)dr]dx＞0,其中w(r)是[0,∞)上某个正的非增函数,那么可压缩磁流体方程组不存在整体弱解.     

一类非局部反应扩散系统的整体存在性与爆破性

运用比较原理获得了一类非局部源的反应扩散系统：ut-△u=∫num1dx∫nvn1dx,ut-△u=∫nvn2dx非负解整体存在和有限时间爆破的条件．     

含函数微分的积分不等式

利用变分方法构造并证明了含变元微分的积分不等式方法,并用该方法推广了Hilbert不等式和Opial不等式,求出了下述不等式的最优常数: ∫Ω∫ΩF(x,y)f(x) g(y) dxdy≤C[∫Ωp(x)[Dβ1f(x))]2dx∫Ωp(x)[Dβ2g(x)]2dx]1/2, C1∫Ωp(x)[Dαf(x)]2d...     

具非局部源的半线性发展方程的爆破问题

研究了下列带有非局部源项的半线性发展方程u1=△u＋u＇∫Ωup（x）dx u11=△u＋u＇∫Ωup（x）dx 的爆破现象,证明了方程的非负解在有限时刻爆破。     

双极量子流体动力学模型的混合边值问题

研究了下列椭圆方程组的混合边值问题:δ2△u=u(V g1(u2)-a1),δ△w=w(-V g2(w2)-a2),-λ△V=u2-w2-C,u=u0,w=w0,V=V0 on ГD,(e)u/(e)v=(e)w/(e)v=(e)v/(e)v=0 onГN·这里u0,w0,V0∈H1(Ω)∩ L∞(Ω),u0,w0≥0 in Ω,v是ГN上的单位外法向量. 证明了方程组解的存在性和唯一性.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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