一维非齐次BBM方程初边值问题的整体吸引子

研究了一维非齐次方程BBM方程ut-αuxxt-(βu2n)x=g(x) f(u) γuxx,α>0,β>0,γ>0,ux(0,t)=0,u(1,t)=0,u( x,0) = u0( x)的初边值问题,利用Sobolev插值不等式,对解做关于时间t的一致性先验估计,证明了该问题的整体吸引子的存在性.     

一类非线性发展方程全局吸引子的存在性

研究一类非线性高阶发展方程(|ut|r-2 ut)t-Δu-μΔut-Δutt+f(u)=g(x)整体解的长时间渐近行为,运用渐近光滑方法研究3r6时系统解半群{S(t)}t0在H10(Ω)×H10(Ω)中全局吸引子A的存在性.A在H10(Ω)×H10(Ω)中紧、不变,并按H10(Ω)×H10(Ω)的范数吸引H10(Ω)×H10(Ω)中的任意有界集.其中非线性项满足临界指数增长条件.     

非自治Kuramoto－Sivashinsky方程一致吸引子的存在性、一致有界性和收敛性

讨论了具有奇异振动外力项的Kuramoto－Sivashinsky方程ut＋Δ2u＋Δu＋u·u＝g(x,t)＋ε－ρh(t/ε),u|t＝τ＝uτ和相应的Kuramoto－Sivashinsky方程ut＋Δ2u＋Δu＋u·u＝g(x,t),u|t＝τ＝uτ在外力项g(x,t),hε(t)仅满足平移有界而非平移紧时Hper(2) 空间中一致吸引子Aε的存在性,进一步证明了一个方程的一致吸引子Aε的一致有界性,并且,当ε→0＋时,Aε收敛到二个方程的吸引子A0.     

一类非自治随机波动方程拉回吸引子的存在性

在R3的有界区域D上考虑了如下具有临界增长率的非自治随机波动方程的长时间渐近行为:utt+αut-Δu+f(u,t)=g(x,t)W+udW/dt其中,W是一维双边标准Wiener过程,f是具有临界增长率、时间依赖的非线性项,g是时间依赖的外力项.此方程的解导出一个具有2个参数的随机无穷维动力过程.证明了此随机无穷维动力过程的拉回吸引子的存在性.非线性项f的非紧性是研究此无穷维动力过程的渐近行为的难点所在.利用构造压缩函数的技术性方法来解决了这一难点.     

在R~N上的具有线性记忆项的非线性反应扩散方程的吸引子的Hausdorff维数和分形维数估计

在无界区域RN上考虑了一类在Coleman-Gwrtin理论中经常出现的具有线性记忆项(用卷积项来表示,反映一个或多个变量的过去历史变化情况)的非线性热传导积分-微分方程ut-Δu-∫0∞k(s)Δu(t-s)ds=f(x,u).对非线性项f(x;u)施加负指数型的条件,把方程改述成历史空间框架下,对相关解的半群的整体吸引子估计了Hausdoff.维数和分形维数的上界.     

非经典扩散方程的时间依赖强全局吸引子的存在性（英文）

本文在具有光滑边界Ω的有界域ΩR~3上研究非经典扩散方程ut-ε(t)Δu_t-Δu+λu=f(u)+g(x)并在强拓扑空间中讨论了该问题解的长时行为.所用方法基于Meng和Liu引入并证明的时间依赖全局吸引子存在性的充分条件.     

无界区域Rn上GBBM方程的指数吸引子

研究了无界区域Rn(n 3)上GBBM方程的长时间动力学行为ut-aΔut-bΔu F(u) γu=h(x),x∈Rn,t∈R ,其中F(u)满足适当条件.应用算子分解技巧和构造加权空间上紧算子等方法,通过对方程的解作先验范数估计,证明了无界区域Rn(n 3)上GBBM方程指数吸引子的存在性.     

记忆型强阻尼波方程的吸引子

本文主要研究带记忆项的强阻尼波方程(6)u-△(6)u-κ(o)△u-(f)κ'(s)△u(t-s)ds+Ψ(u)=f解的长时间行为.我们证明了轨道和全局吸引子的存在性,并给出了它们结构的刻画.     

带调和势的非线性Schrdinger方程的整体吸引子(英文)

讨论了带调和势的非线性Schrdinger方程iut+uxx-x2u+|u|2u+iαu=f(x)解的长时间行为,证明了该方程整体吸引子的存在性.     

带有非线性阻尼的 Plate 方程解的长期行为

笔者考虑了一般的Plate方程ut＋g（ut）＋Δ2u＋（β-‖△u‖2）Δu＋f（u）＝h（x）解的长时间行为,其中β＝R．当外力项h仅属于H-2（Ω）时获得了方程解的有界吸收集的存在性;当h∈L2（Ω）时,证明了与方程相关的解半群拥有一紧不变的全局吸引子．     

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.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

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-