可换Lipschitz半群的拟轨道的渐近动态

设C是实Hilbert空间H的闭凸集,G是含有单位元的可换半群。如果■={S(t):t∈G}是C上的Lipschitz映射所成半群,用k_t表示S(t)的Lipschitz常数,有lim supk_1≤1,那么■的拟轨道{u(t):t∈G}弱收敛于C中某一点的充分必要条件是对任意,h∈G,u(t+h)-u(t)弱收敛于0。     

关于一致正规结构

Banach空间X称为具有正规结构,如果对每个非平凡有界凸子集K,存在p∈K,使 sup{‖p-x‖;彩x∈tr}相似文献   

Banach空间上Lipschitzian映射的渐近行为

设X是具Frechet可微范数或Opial条件的一致凸Banach空间，C是X的非空有界闭凸子集，｛Tn｝n=1^∞是C上渐近非扩映射,文中主要证明了：若存在x0∈C，使得ωω（x0）∪→AF（S）和lim supm→ ∞lim supn→ ∞||TnTmx0-Tnx0||=0成立，则存在p∈AF(S),使得Tnx0ω↑→p。     

Hilbert空间中逼近算子不动点的几何结果

设E是Hilbert空间,T是E中具非空不动点集F(T)的非线性映象,许多非线性映像的多种形式的迭代序列{xn}可逼近映像T的不动点p0∈F(T).并且逼近过程{xn}与不动点集F(T)有如下的钝角关系lim supm→∞〈p-p0,xn-p0/‖xn-p0‖〉≤0,(A)p∈F(T).证明了一般非线性映像不动点逼近过程的这种几何结果,并应用这个结果研究了具误差Ishihwa迭代逼近非扩张映像不动点的钝角关系.     

Banach空间中的非Lipschitzian一般半群的非线性遍历定理（英文）

设G为半群,C为具FrEchet可微范数的一致凸Banach空间X的非空有界闭凸子集.（■）={T_t：t∈G}为C上到自身的渐近非扩张型半群,且F（■）非空.在本文中,我们证明了：对■的任一殆轨道u（·）,■co{u（ts）,t∈G}∩F（S）至多为单点集.进一步,对x∈C,∩_（s∈G）co{T_（ts）x,t∈G}∩F（■）非空当且仅当存在C到F（■）上非扩张压缩P,使得对任意t∈G,PT_t=T_tP=P,Px∈co{T_tx,t∈G}.这一结果不仅推广了许多已知结果,而且说明它们中的一些关键条件是不必要的.     

矩阵方程AX＋YB＝D及AX＋XA＝D的最优解

本文考虑如下问题问题Ⅰ.给定A∈Rm×n,B∈Rt×p,D∈Rm×p,设L1={[X,y]X∈Rm×p,Y∈Rm×t,‖AX+YB-D‖=min},求[X,Y]∈L1,使得‖[X,Y]‖=(‖X‖2+‖Y‖2)1/2=min问题Ⅱ.给定A∈SRm×m,B∈Rm×m,(a)设S1={XX∈SPm×m,‖AX+XA-B‖=min}求     

T.A.Burton定理的拓广

设r>0为一给定常数,C_n=C(〔-r,0〕,R~n).对φ∈C_n,定义‖φ‖=sup|φ(s)|,对任意给定常数H>0,记C~H_m考虑泛函微分方程(t)=F(t,x_t,y_t)(1)■(t)=G(t,x_t,y_t)其中F∈C(t, 0, 0)=0,G(t, 0, 0,)=0_0本文证明文的主要定理中,李雅普诺夫函数沿方程的解的导数关于状态变元(x,y)的定负性条件,可用李雅普诺夫函数沿方程的解的导数仅关于部分状态变元y的定负性条件代替.     

关于一致正规结构

Banach空间X称为具有正规结构,如果对每个非平凡有界凸子集K,存在p∈K,使sup{||p-x||;x∈K}相似文献   

非Lipschitzian右可逆半群的弱收敛定理

设C为自反Banach空间X的非空有界闭凸子集,X具备Opial条件或X*具KK性质,S={T(t):t∈G}是C上的γ类渐近非扩张型右可逆半群,u为S上的渐近等距殆轨道.若D上有不变平均,则下列命题等价:①ww(u)F(S);②w-limt∈Gu(t)=p∈F(S);③对任意的h∈G,w-limt∈G[u(ht)-u(t)]=0.     

关于广义凸性模

设X是维数不小于2的实Banach空间,分别记X的单位球面和单位球为SX={x∈X:‖x‖=1}和BX={x∈X:‖x‖≤1}.对于每个α∈(0,1),X的广义凸性模δ(α)(ε):[0, 2]→[0, 1] 定义如下:δ(α)(ε)=inf{1-‖α x (1-α)y‖:x,y∈SX,‖x-y‖≥ε}. 上述定义中的"SX"和""可以分别替换为"BX"和"=", 详细的证明见文献[1].     

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