平均非扩张映射Ishikawa迭代收敛的充要条件

在Banach空间中研究了平均非扩张映射Ishikawa迭代的逼近问题,给出了平均非扩张映射的Ishikawa迭代的收敛的充要条件:limn→∞inf‖xn-Tyn‖=0.所得结果改进和推广了平均非扩张映射的Ishikawa迭代收敛的性质.     

渐近伪压缩映象不动点的迭代逼近

设C是实Banach空间E的非空凸子集,T:C→C是具有不动点p的一致L-Lipschitz的渐近伪压缩映象,{xn}是带误差的修改的Ishikawa迭代序列,在存在严格增加函数:[0,∞)→[0,∞),ф(0)=0,使得〈Tnxn 1-p,j(xn 1-p)〉≤kn‖xn 1-p‖2-ф(‖xn 1-p‖)■n≥0的条件下,对参数作了一些限制,证明了带误差的修改的Ishikawa迭代序列强收敛于T的不动点p.     

Ishikawa迭代收敛点与最佳逼近元

研究了Ishikawa迭代收敛点与平均非扩张映射的不动点集中的最佳逼近元之间的关系.证明了Ishikawa迭代收敛点必是平均非扩张映射的不动点集中的最佳逼近元.     

非扩张映像Ishikawa迭代参数趋向[0,1]端点时的收敛定理

设X是一致凸Banach空间,C是X中非空闭凸子集,T：C→C是具不动点的非扩张映像,对任意的x1∈C,存在Ishikawa迭代过程{xn|(xn 1=(1-tn)xn tnT(snTxn (1-sn)xn),tn→1,sn→0,∞↑∑↓（n=1) (1-tn)= ∞的子序列{xnk},使‖xnk-Txnk‖→0(k→∞）,证明了当映像T具紧性时,Ishikawa迭代过程{xn}强收敛于某不动点,当空间X满足Opial’s条件时,Ishikawa迭代过程{xn}弱收敛于某不动点。     

凸度量空间内渐近拟非扩张映射不动点的迭代

2001年和2002年Liu Qihou推广了Petryshgh和Williamson,Ghosh和Debnath分别在1973年和1977年的结果,在Banach空间和一致凸Banach空间证明了Ishikawa迭代序列和带误差的Ishikawa迭代序列收敛于渐近拟非扩张映射不动点的若干充要条件.笔者在凸度量空间内,定义了带误差的Ishikawa迭代程序,并且证明了带误差的Ishikawa迭代程序收敛于渐近拟非扩张映射不动点的若干充要条件.该结果统一和推广了近期文献中的许多已知结果.     

具误差的渐进伪压缩映射不动点的迭代

主要研究在巴拿赫空间中具误差的渐进伪压缩映射Ishikawa和Mann 迭代收敛到不动点的问题.Ishikawa迭代和Mann迭代是具误差的Ishikawa迭代和Mann迭代的特例.在以前的基础上,将渐进伪压缩映射从单值推广到多值,将Ishikawa迭代和Mann迭代从不带误差推广到带误差.论文中所得到的结果是对以前结果的一种推广.     

q-赋范空间中Zamfirescu算子Ishikawa 迭代的收敛性

设X为q-赋范空间,T为Zamfireseu算子.证明了Zamfirescu算子T的Ishikawa迭代收敛于T的不动点,并且某些Ishikawa迭代序列与Mann迭代序列的收敛性是等价的.     

Hilbert空间中非扩张映射带误差项的Ishikawa迭代序列

讨论了Hilbert空间中非扩张映射修正的带误差项的Ishikawa迭代序列的强收敛和弱收敛性质,并且给出了该迭代序列强收敛和弱收敛于不动点的充分条件.     

半压缩映像下含误差项的变形Ishikawa迭代序列不动点的逼近

文章讨论误差项的变形Ishikawa迭代序列,证明了含误差项的变形Ishikawa迭代序列收敛到半压缩映像的不动点的若干充分必要条件.     

Banach空间中具误差的Ishikawa和Mann迭代序列的强收敛定理

在新的限制条件下，通过引入序列不等式证明了具误差的Ishikawa和Mann迭代序列的强收敛定理，并得出了Ishikawa和Mann迭代的强收敛定理．     

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