带有滑动边界的可压缩磁流体方程解的局部存在性

研究了在有界区域Ω?R~3中带有滑动边界条件的可压缩磁流体方程解的局部存在性.首先构造可压缩磁流体方程组的线性化方程组,然后利用Galerkin逼近方法证明线性化可压缩磁流体方程组解的局部存在性,最后通过对线性化可压缩磁流体方程的解进行迭代,构造原方程组的逼近解序列,利用能量估计和二阶椭圆估计证明逼近解收敛,从而证明可压缩磁流体方程组解的局部存在性。     

一类具退化强制的椭圆方程熵解的存在性

通过运用截断方法研究了一类带有变指数的椭圆方程.先利用变指数情形下的Marcinkiewicz估计,在得到逼近解序列的截断函数先验估计的基础上,选取适当的检验函数对逼近解序列做出估计,以此得出这类椭圆方程在加权Sobolev空间中熵解的存在性.     

一类广义Boussinesq方程局部弱解的存在唯一性

在三维空间的情形下,对一类非线性广义Boussinesq方程的Cauchy问题进行研究,利用Galerkin方法证明问题的局部弱解是存在且唯一的。首先选取适当的逼近解,借助Sobolev空间中的一些基本不等式,建立关于逼近解的能量估计式,利用能量估计式和弱收敛定理,证明问题存在一个局部弱解。最后利用证明能量估计式的过程中得到的结论对局部弱解的唯一性进行证明。     

Boussinesq方程组解的存在唯一性和Fourier谱方法的误差估计

引入Ｆｏｕｒｉｅｒ谱方法逼近来解决Ｂｏｕｓｓｉｎｅｓｑ方程周期初值问题局部广义解和古典解的存在唯一性问题，在给出了Ｆｏｕｒｉｅｒ谱方法逼近解的估计后，利用紧至于和性原理得到了Ｂｏｕｓｓｉｎｅｓｑ方程组周期初值问题局部广义解和古典解和存在性和唯一属于是一步加强初值条件的光滑性，得到了古典解的存在性，最后，给出了Ｆｏｕｒｉｃｒ谱性，进一步加强初值条件的光滑性，得出了古典解的存在性，最后，给出了Ｆｏｕｒ     

一类抛物型方程局部解的存在性与爆破

在总结前人研究抛物型方程的局部解的存在性与爆破性问题的基础上,证明了抛物型方程当初值满足一定条件时局部解的存在,以及当初值充分大时解将在有限时间内发生爆破,且当方程中参数β大于1时,不是利用比较原理,而是利用迭代的方法得到了解的Ls估计.     

Boussinesq方程组解的存在唯一性和Fourier谱方法的误差估计

引入Ｆｏｕｒｉｅｒ谱方法逼近来解决Ｂｏｕｓｉｎｅｓｑ方程组周期初值问题局部广义解和古典解的存在唯一性问题．在给出了Ｆｏｕｒｉｅｒ谱方法逼近解的估计后，利用紧致性原理得到了Ｂｏｕｓｉｎｅｓｑ方程组周期初值问题局部广义解和古典解的存在性和唯一性．进一步加强初值条件的光滑性，得出了古典解的存在性．最后，给出了Ｆｏｕｒｉｃｒ谱方法的误差估计．     

一类耦合的KdV型方程的周期解

讨论了一类耦合的KdV方程在一定条件下周期解的存在性.利用Sobolev不等式,给出了此方程解的估计以及它们的一二三阶导数的估计,然后根据Galerkin近似解及其先验估计,得到了耦合KdV方程弱解的局部存在性.     

具有非局部结构阻尼的非自治梁方程的时间依赖拉回吸引子

利用时间依赖空间上的过程理论,研究具有非局部结构阻尼的非自治梁方程解的长时间动力学行为.首先,用Faedo-Galerkin逼近方法得到解的适定性;其次,利用能量估计得到该动力系统在相应解空间中拉回吸收集的存在性;最后,用共圈技术和收缩函数的方法证明时间依赖拉回吸引子的存在性.     

一类具有变指数伪抛物型方程解的存在唯一性

考虑一类具有变指数伪抛物型方程的第一初边值问题. 对于一般光滑区域Ω, 先通过Galerkin方法构造问题的逼近解, 然后在参数满足一定条件下利用能量估计方法得到逼近解的一致性先验估计, 进而证明该类问题弱解的存在唯一性.     

一类四阶非线性抛物方程弱解的存在性

研究了一类四阶非线性抛物方程的初值问题. 通过对时间的离散化构造并证明了逼近解的存在性,然后利用逼近解的一致估计结合紧致性原理证明了问题弱解的整体存在性.     

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.     

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-