一类部分和序列的Lp范数收敛性

设(Tk,k∈P)为一列具有Δ性质的算子, 本文运用鞅方法考虑了部分和序列{n∑k=1Tkf}的Lp范数收敛性, 得到了一些充分条件,所得结果对于研究鞅变换的收敛性问题是很有用的.     

随机指标鞅序列的收敛性

主要讨论了以停时序列{τn}n∈N作为鞅序列{xn}n∈N的指标时,序列{xτn}n∈N的收敛性问题.     

关于Banach空间中有限多个渐近伪压缩映像的迭代格式

设E是实Banach空间,K是E的非空有界闭凸子集,设Ti:K→K,i=1,2,…,N,是N个一致渐近L-Lipschitzian,具序列{ε(i)n}的一致渐近正则和具序列{k(i)n}的渐近伪压缩映像,其中{k(i)n}和{ε(i)n},i=1,2,...,N满足某些适当条件.对给定的x1∈K,给出了一个关于映像Ti,i=1,2,…,N的具扰动映像的混合迭代格式.证明了由此迭代格式生成的序列{xn}满足:xn-Tlxn→ 0(n→∞),l∈{1,2,…,N}.     

复值渐近鞅的收敛性

鞅型序列的收敛性在理论及实际问题中都有广泛的应用,研究各类鞅型序列的收敛性是近年来随机学领域的一个重要课题.文献中分别给出了右闭鞅收敛定理和渐近鞅收敛定理.该文通过研究几类鞅收敛性,建立了复概率空间,定义复概率空间中的渐近鞅,证明了复概率空间上渐近鞅的收敛性.     

鞅收敛定理的讨论

设(Ω,F,μ)为一概率空间,{F_n}_(n∈N)为一列上升的F的子σ代数,N表示非负整数集合。定义设{X_n,F_n}_(n∈N)为一鞅(上鞅),由{X_n}的任一子列{X_n_k}构成的鞅(上鞅){X_n_k,F_n_k}_(k∈N)称为{X_n}的子鞅(子上鞅)。为方便起见,简记鞅(上鞅)为{X_n},子     

由AANA序列生成线性过程的中心极限定理

考虑线性过程■,其中{Xn,n≥1}是均值为零且方差有限的渐近几乎负相依(AANA)随k=-∞∞∞n机变量序列,{a_k,k∈Z}是一实数列,满足■,在适当的假设下,利用AANA序列的矩不等式及线性过程{Y_t≥1}的收的收敛性,给出AANA序列生成线性过程的中心极限定理.     

一个基于函数值平均权重的新的非单调自适应信赖域算法

将一种基于函数值平均权重的非单调线搜索技术与自动确定信赖域半径的方法相结合,提出求解无约束优化问题的一个新的非单凋自动确定信赖域半径的算法.在假设H∶A.对任意的x1∈Rn,水平集L(x1)={x∈Rn|f(x)≤f(x1)}有界;B.在水平集L(x1)={x∈Rn|f(x)≤f(x1)}内,目标函数f(x)的梯度函数g(x)满足Lipschitz条件;C.矩阵序列{Bk}一致有界及其它条件下证明了本算法的全局收敛性.     

一类鞅差序列加权和的Baum-Katz大数定律的精确渐近性

设{(ξ1,ζ1),1≤i＜∞)为适应的鞅差序列,{Cnk:1≤k≤n}为双下标常数列,文章获得了一类鞅差序列加权和Sn=n∑k=1Cnk(ξ)k的Baum-Katz大数定律的精确渐近,给出了∑n≥＞1nr/p-2P(|Sn|≥∈n1/p),∑n≥11/P(|Sn|≥∈n1/p)当∈→0时的精确渐近性.     

Banach空间的RNP及鞅不等式的相关研究

设B是有限维的,通过研究B值鞅型序列之间的关系及鞅的收敛性、RNP和光滑性,得出了RNP一个简明的充分条件和B值鞅的一个不等式.     

Banach空间值渐近鞅(amart)的极限定理

主要研究取值于p一致光滑的Bananch空间值渐近鞅及其差序列的局部收敛性和大数定律,将引理[2]中胡迪鹤关于鞅的相应结论推广到渐近鞅的情况,并且推广了万成高在文献[5]和文献[6]的相应结论.     

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.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the