非负ρ-混合随机变量的逆矩

在一阶矩有限的条件下获得了非负同分布ρ-混合随机变量序列部分和的逆矩的渐进逼近,部分推广了已有的结果,即设{Zn,n≥1}是非负同分布的ρ-混合随机变量序列,对任意n≥1,Xn=n∑k=1 Zk.如果0＜EZj＜∞,则对任意a＞0,α＞0,E(a+Xn)α～(a+EXn)-α成立.     

渐近非扩张映象的粘性逼近序列的强收敛定理

假设E是具有一致Gateaux可微范数的实Banach空间,D是E的非空闭凸子集,f∶D→D是压缩映象,T∶D→D是渐近非扩张映象。设粘性逼近序列{xn}定义为xn 1=αnf(yn) (1-αn)Tnyn,yn=βnxn (1-βn)Tnxn(n≥0),其中αn∈[0,1],βn∈[0,1]。本文给出了{xn}强收敛于T的不动点的充要条件:若{αn}满足如下条件:limn→∞αn=0,∑∞n=0αn=∞,定义一簇压缩映象Sn∶D→D为Sn(z)=(1-dn)f(z) dnTnz,z∈D,其中dn=ktnn--αα,tn∈(α,1)(n=1,2,…),limn→∞tn=1且k2n-1≤(1-dn)2,n≥n0,设zn∈D是Sn的唯一不动点,即zn=Sn(zn)=(1-dn)f(zn) dnTnzn,n≥1,若limn→∞‖xn-Txn‖=0且{zn}强收敛于z*∈F(T),则{xn}强收敛于z*∈F(T)的充分必要条件是{yn}有界。本文的结果不仅是对Reich公开问题的解答,而且是对Reich[1-2]、Shioji和Takahashi[3]、张石生[4]相应结果的推广。     

渐近伪压缩型映象Noor三步迭代序列的收敛性

在没有使用∑n=0∞α_n(k_n~(-1))∞条件,并用更弱条件α_n→0(n→∞)和{T~ny_n}_n≥0有界分别取代∑n=0∞α_n~2∞和值域T(D)有界的条件下,在实Banach空间中建立了渐近伪压缩型映象不动点的带混合型误差的修改的Noor三步迭代序列的强收敛定理,从而改进和推广了有关文献中的相应结果.     

有限族渐近伪压缩映象Ishikawa迭代收敛的充要条件

在取消φ（ t）≤t,βn≤αn ,∑^∞n＝0αn （ kn-1）＜∞条件下,并用αn→0（ n→∞）取代∑∞n＝0α^2n ＜∞,在Banach空间中建立了有限族一致Lipschitz的渐近伪压缩映象不动点的修改的Ishika-wa迭代序列收敛的充要条件,从而本质推广和改进了已有文献中的结果。     

Banach空间中关于一致Lipschitzian映象的一个新结果

设E是一实Banach空间,K为E中的一非空闭凸子集,Ti:K→K,i=1,2,3为一致Lipschitzian连续映象.如果序列kn(∩)[1,∞),kn→1,{αn}、{βn}、{δn}∈[0,1],满足:(i)δn→1(n→∞);(ii)∑∞n=0αn=∞,∑∞n=0βn=∞;(iii)∑∞n=0α2n＜∞,∑∞n=0αnβn＜∞;(iv)∑∞n=0αn(kn-1)＜∞,对x0∈K,让{xn}满足以下迭代序列xn+1=(1-αn)xn+αnT n1ynyn=(1-βn)xn+βnT n2znzn=(1-δn)xn+δnT n3xn,如果存在严格增的函数φ:[0,∞)→[0,∞),φ(0)=0,使得对(A)j(x+y)∈J(x+y),x∈K(i=1,2,3)有〈T nix-x*,j(x-x*)〉≤kn||x-x*||-(ψ)(||x-x*||),则{xn}收敛于x*.文章主要结果推广了张石生教授最近文献[1,8]以及文献[6-7]等的主要结果.     

Lipschitz增生算子方程带误差Ishikawa迭代的收敛性

设E是任意实Banach空间,T:E→E是Lipschitz的增生算子,在∞∑n-0αn=∞,αn→0和lim sup βL(L 1)＜1的条件下研究了带误差的Ishikawa迭代序列收敛到方程Tx=f的惟一解的问题.     

非扩张映射的粘性迭代逼近

文中讨论了下面修正Mann’s迭代格式{xn},x0∈K,xn 1=(1-αn)yn αnf(xn)yn=(1-βn)Txn βnxnn≥0的迭代序列的收敛性问题,在适当的假设条件之下在Banach空间中证明了迭代序列{xn}强收敛到非扩张映射的某个不动点x,且x是某个变分不等式在不动点集F(T)上的唯一解.结果改进和推广了Xu Hong-kun[1]、Kim Tae-hwa和Xu Hong-kun[2]等的相应结果.     

|x|α在Chebyshev结点的有理插值

本文构造Newman-α型有理算子(0＜α＜1),利用其逼近一类非光滑函数,并研究逼近速度.论文证明了当结点组X选取修正的Chebyshev结点时,有理算子对|x|α的逼近阶为O(1/n3αlogn),并验证在此类构造下结果为最优.究其本质,可进一步构造细分结点,得到逼近阶为O(1/n(k+1)αlogn).     

关于Lipschitz严格伪压缩映象的带误差的Ishikawa型迭代程序

设K是任意实Banach空间X中的闭凸子集,T ∶ K→K是Lipschitz严格伪压缩映象,在没有假设∑∞n=0αnβn＜∞之下,本文证明了由xn+1=(1-αn) xn+αnTyn+un与yn＝(1-βn) xn+βnTxn+vn,n∈N,生成的带误差的Ishikawa迭代序列强收敛到T的唯一不动点,并给出了更为一般的收敛率估计:若un=vn=0,n∈N,则有‖xn+1-x*‖≤(1-γn) ‖xn-x*‖≤…≤∏nj=0(1-γj) ‖x0-x*‖,其中{γn}是(0,1)中的序列,满足γn≥11+kmin(ε,η-ε) αn.所得结果改进和推广了最新的一些结果.     

奇数阶非线性中立型时滞差分方程正解的存在性

在(α-1)2 (p-1)2>0,且10mss∞s?q=∑<∞的条件下证明了奇数阶非线性中立型时滞差分方程?m(xn?pxnα?τ) qn x nβ?σ=0,n≥n0,存在有界正解,所得的结果推广了已有的结果.其中τ>0和σ≥0是整数,α和β分别是两个正奇数之比,p∈(?∞,∞),{q n}是非负实数列.     

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