Helton类算子的(ω1)性质的稳定性

算子T∈B(H)称作有(ω1)性质,如果σa(T)\σea(T)(∈)00(T),其中σa(T)和σea(T)分别表示算子T的逼近点谱和本性逼近点谱,π00(T)={λ∈iso σ(T):0＜dim N(T-λI)＜∞}.本文研究了Helton类算子的(ω1)性质的稳定性,同时研究了2x2上三角算子矩阵在紧摄动下的(ω1)性质的稳定性.     

BernStein算子和Bernstein-KantoroVi算子的∧_ω(A)类保持性质

设ω(x)是[0,1]上的上凸连续模函数,记A_ω(A)={f∈[0,1]:ω(f,x)≤A_ω(x)},本文得到f∈A_ω(A)的充要条件是L_n(f)∈A_ω(A),其中L_n表示Bernstrein算子B_n或BernsteinKantorovi(?)算子K_n。     

Bernstein算子和Bernstein-Kantorovic算子的∧_ω(A)类保持性质

设ω(x)是[0,1]上的上凸连续模函数,记∧_∞(A)={f∈c[O,1]:ω(f,x)≤Aω(x)},木文得到f∈A_∞(A)L_n(f)∈∧_ω(A),其中L_n表示Bernstein算子或Bernstein-Kantorovic算子。     

二阶抽象微分方程的多项式有界解的极大子空间

受文de Laubenfels[1](1997,Isreal Journal ofM athem atics,98:189~207)的启发,引进空间W(A,k)和H(A,ω),它们分别是使得该二阶抽象Cauchy问题有在[0,∞)一致连续且O((1 t)k)有界和O(eωt)有界的弱解的x∈X的全体.讨论Banach空间X上二阶抽象Cauchy问题的具有多项式有界解或指数有界解的极大子空间问题.由W ang and W ang[2](1996,Functional Analysis in Ch ina.K luwer,333~350)知,该Cauchy问题适定的充要条件是该Cauchy问题中的X上闭算子A生成一个强连续Cosine算子函数.处理该Cauchy问题不适定的情况.证明或指出了如下结论:.W(A,k)和H(A,ω)均为Banach空间,且W(A,k)和H(A,ω)均连续嵌入X;.部分算子A|W(A,k)生成一个多项式有界的余弦算子函数{C(t)}t∈R ,使‖C(t)‖W(A,k)≤2(1 t)k;.部分算子A|H(A,ω)生成一个指数有界的余弦算子函数{C(t)}t∈R ,使‖C(t)‖H(A,ω)≤2eωt;.W(A,k)和H(A,ω)分别是极大的.即若有Banach空间Y连续嵌入X,且使A|Y生成一个O((1 t)k)有界的余弦算子函数,那么Y连续嵌入W(A,k);而若使A|Y生成一个O(eωt)有界的余弦算子函数,那么Y连续嵌入H(A,ω).     

齐次Rota-Baxter 3-李代数(Ⅰ)

无限维单3-李代数Aω=∑m∈ZFLm上的齐性Rota-Baxter算子R是Aω的Rota-Baxter算子,且满足R(Lm)=f(m)Lm,其中f:Z→F.因为当λ不等于0时,3-李代数的权为λ的Rota-Baxter算子完全由权为1的Rota-Baxter算子所决定.因此,本文主要研究了Aω上权为1且满足|W1|∞的齐性RotaBaxter算子的结构,并在3-李代数Aω的基底空间A上利用齐次Rota-Baxter算子构造了5类3-代数(A,[,,]j),并证明了3-李代数(A,[,,]j)都是齐性Rota-Baxter 3-李代数.     

Szász-Bézier和Baskakov-Bézier算子的加权逼近阶

利用一阶加权光滑模ωλφ(f,t)ω讨论了Szász-Bézier算子和Baskakov-Bézier算子带权w(x)=x0(1-x)b(0＜a＜1,b＞0)的点态逼近,并给出了它们的逼近阶.     

算子演算的a-Browder定理和(ω1)性质的等价性

根据一致可逆性质定义的一种新谱集σ2(·).通过它与变化的本质逼近点谱σ1(·)之间的关系,给出了算子演算满足a-Browder定理和有(ω1)性质的充要条件.研究了a-Browder定理和(ω1)性质对算子及其共轭的算子演算同时成立的条件,描述了H(P)类算子的算子演算的(ω1)性质.     

一类向量值的加权模不等式

对于向量值函数空间LpB(Rn,ωdx)中的极大算子,利用Holder不等式及广义Minkowski不等式,对给定的权函数v(x)≥0存在另一个权函数ω(x)＜∞,a.ex∈Rn,使得Hardy-Littlewood极大算子从LpB(Rn,ωdx)到Lp(Rn,vdx)是有界的.     

弱Liouville频率下解析拟周期Jacobi算子Lyapunov指数的Hlder连续性

考虑一维拟周期Jacobi算子(Hx,ωΦ)(n)=-b(x+(n+1)ω)Φ(n+1)-b(x+nω)Φ(n-1)+a(x+nω)Φ(n),n∈Z Lyapunov指数的连续性,其中:x∈T;a(x),b(x)在T上实解析且b(x)不恒为零.运用次调和函数的Fourier系数控制理论,结合ω的数论性质,通过分析得到Jacobi算子的大偏差定理及该算子在弱Liouville频率下其Lyapunov指数的Hlder连续性.     

Szász-Kantorovich算子的加权逼近

利用Ditzian模ω2φλ(f,t) ( 0 ≤λ≤ 1)和Jacobi权w(x) =xa( 1+x) b( 0 ≤a <1)研究了Sz偄ｓｚ Kantorovich算子的加权逼近 ,得到了Sz偄ｓｚ Kantorovich算子与它所逼近函数光滑性之间的关系 ,推广了以前该算子关于ω2φ(f,t)和ω2 (f,t)的结果 .     

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