一类(1+1)维非线性微分方程的不变集与精确解

不变集方法是构造非线性偏微分方程精确解的一种有效方法,文章利用不变集思想方法,讨论了(1+1)维偏微分方程u_t=A(u)u_(xxx)+B(u)u_xu_(xx)+C(u)(uu_(xx))_x+D(u)u_x+P(u)问题,并得某些情况下方程的精确解。     

Banach格中的极限集及应用

给出Banach格中(几乎)极限集的特征及应用.Banach格中的一些常见性质如正Schur性质和双序列性质将用(几乎)极限集和(几乎)Dunford-Pettis集进行刻画.     

关于集值测度的Radon—Nikodym导数

0 引论本文首次引进了关于集值测度的积分,讨论了关于集值测度的 Radon-Nikodym 导数与其选择的 Radon-Nikodym 导数之间的关系,并给出了一个充分必要条件。本文规定:(T,(?),λ)是有限测度空间,(?)(R~n)为 R~n 的全体子集,对 A(?)R~n,cl(A)表示 A 的闭色。定义1 (1)集值映射π:(?)→(?)(R~n)称为集值测度,如果满足:(a)π(A)≠φ(A∈(?));(b)A_i∈(?)(R~n)(i≥1),A_i∩A_j=φ(i≠j)时,有     

广义Boussinesq方程的不变集与精确解

不变集方法是一种构造非线性偏微分方程精确解的有效方法.文章利用不变集思想方法,讨论了一类非线性偏微分方程utt=A(u)uxxxx+B(u)uxx+C(u)(uux)x+D(u)u2d的问题,得到了一些情况下对应方程的精确解,从而丰富了这类方程解的研究.     

框架小波集和紧框架小波集

引入了L2(R)的约化子空间X的框架小波集和紧框架小波集的概念,证明了一个可测集E是XΩ的框架小波集充分必要条件是E为基本集且所有2nE(n∈Z)的并集为Ω;给出了可测集E为XΩ的紧框架集、小波集的充要条件,从而使DaiXingde等人关于L2(R)的有关结果成为该结论的特例.     

图与补图断裂度的关系

在这篇文章中,作者解决了图与补图断裂度关系的问题.主要结果:1、若n(≥4)阶图G与(?)都连通,则(1)-(n-5)≤B(G)_B(G)≤n-2:(2)对[-(n-5),n-2]中任一整数r,都存在G,使B(G)+B(?)=r.2、若n(≥5)阶图H与(?)都是Hamilton图,则(1)-(n-5)≤B(H)+B(?)≤0;(2)对[-(n-5),0]中任一整数r,都存在互补的Hamilton图H和(?)使B(H)+B(?)=r.     

关于路图的连通度

研究图 G 的路图 P_3(G)的连通度,得到3—正则连通图 G 的路图 P_3(G)是2—连通的且也是4—连通的等一些结论.     

k-阶圈链Q(Cs1,P2,Cs2,…,P2,Csk)Hosoya指标最大值

图族k-阶圈链Q(C s 1 ,P 2,C s 2 ,…,P 2,C s k )是n个顶点的图,由k个圈C s 1 ,C s 2 ,…,C s k 通过使相邻两个圈C i和C i+1 (i=1,2,…,k 1)分别被路P 2的两个顶点点粘接而得到．通过对图族k-阶圈链Q(C s 1 ,P 2,C s 2 ,…,P 2,C s k )的 Hosoya 指标进行研究,刻画出该类图族的 Hosoya 指标取得最大值的图是Q(C 4,P 2,C 4,…,P 2,C n 4(k 1) )．     

线段上连续自映射混沌现象的充分条件

2002年赵勇提出了线段连续自映射混沌现象的几个充分条件,本文在此基础上,用分析的方法根据ω-极限轨迹的特点将其分为各种情况,得到了线段连续自映射混沌现象的两个充分条件.即设f为线段I上的一个连续自映射,x∈ω(f)-P(f),若存在mi∈N(当I→ ∞时mi→ ∞),使得,fmi 3(x)＜fmi(x)＜fmi 2(x)＜fmi 1(x),则f在I是混沌的和设f为线段I上的一个连续自映射,x∈ω(f)-P(f),若存在mi∈N(当I→ ∞时mi→ ∞),使得fmi 3(x)＞fmi(x)＞fmi 2(x)＞fmi 1(x)则f在I是混沌的,进一步揭示混沌现象的本质.     

L-Flou集范畴及其层表示

用模糊集的方法和原理,给出L-flou集合范畴Set(fL)的概念,并证明L-fuzzy集合范畴Set(L)与范畴Set(fL)的同构关系.根据范畴Set(L)与赋予层结构的集合范畴SetL(S H)的同构关系,得到范畴Set(fL)同构于范畴Set_L(S H).     

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-