污染数据线性回归模型的参数估计和区间估计

研究线性回归模型：yi=α＋βxi＋εi,i=1，2，…，n，其中Eεi=0，Eεi^2=σ1^2;但y1，y2，…，yn受到另一个独立同分布随机变量序列W1，W2，…，Wn的污染，仅能观察到yi^＊=（1-v）yi＋vwi,i=1，2，…n，Wi与yi相互独立．文章给出了α，β，v的估计及区间估计．     

污染数据回归模型的相合估计

考虑线性回归模型yi=xi′β iε,i=1,2,…n,其中ε=(1ε,…,nε)′满足E()ε=0,Cov()ε=21σV(V>0),假定{yi}受到另一独立同分布的随机变量序列{iμ}的污染,仅能观察到污染数据,{yi}与{iμ}独立,本文给出污染参数及回归系数的参数估计,并证明在适当的条件下其具有强,弱相合性。     

非线性约束条件的污染数据的L2-估计

讨论非线性回归模型yi=f(xi,β)+ei,i=1,2,...,n,其中Eei=0,Eei2=α21,假设yi受到另一独立同分布随机变量序列ui的污染,仅能观察到污染数据y*i=(1-v)yi+vui,0≤v《1,v为未知参数.估计问题带有等式和不等式约束,约束是非线性的.首先利用矩估计方法给出污染参数的估计,最后利用最优化方法讨论了其非线性约束的L2-估计渐近问题,并给出估计量是概率有界的等相关结果.     

相依误差下回归函数导数估计的渐近分布

设y1,…，yn是固定点x1,…，xn的n个观察值，适合模型yi=g(xi) εi,1≤i≤n。在{εi}为φ－混合、α－混合、ρ－混合误差序列情形下，得到了回归函数导数估计的联合渐近分布。     

半参数回归模型的稳健估计

考虑半参数回归模型yi＝Ti^Tβ g(ti)-εi i=1,2,…n,先由稳健估计的原则得出β^Λ和g^Λ（t)，然后基于影响函数得出这些估计的方差——协方差矩阵。     

多重线性回归的最小二乘估计的递推算法

给出多重线性回归yi=β0+β1xil+…+βpxip+εi(i=1,2,…,n)的最小二乘估计的递推算法β(n)=β(n-1)=PnXn(yn-Xtnβ(n-1)Pn=Pn-1-Pn-1XnXtnPn-1β(0)=0,P0=αI(α>>1).这种算法是自适应的,也是均方收敛的.     

一类多元线性模型的一致最小方差无偏估计

本文讨论一类多元线性模型 :y=(S T′) β+e,E(e) =0 ,e=(ε′(1) ,… ,ε′(n) )′,E(ε(i) ε′(n) ) =Φ 0 ,E(ε(i) ε′(i) ε(i) ε′(i) ) =K,i=1 ,2 ,… ,n.当 y准正态分布时 ,在一定意义下得到Φ的 L S估计Φ1,以及 tr(DΦ1)为 tr(DΦ ) (D=D′)的一致对 (Φ ,k)的最小方差无偏估计 (UMVUE)的若干充要条件 .     

一类时滞差分方程组的振动准则

考虑如下时滞差分方程组△（yi（n））=fi（b,y1（τ1（n））,y1（τ2（n））,y1（τ2（n））,y2（τ2（n）））,n≥n0 i=1,2其中（i）fi（n,u1,u2,v1,v2）对所有参数都是连续的;（ii）τi（n）∈C[N0,R^＋],τi（n）≤n,且τi（n）单调不减lim n→∞ τi（n）=∞,i=1,2,获得了该方程组所有解振动的充分条件。     

相依误差下回归函数的小波估计

对于非参数回归模型Yi=g(ti)+σiεi,i=1,2,…,n,中的函数g(t)的小波估计■n(t),在{εi,i=1,2,…,n}是NA和PA随机误差时,研究了估计■n(t)的弱相合速度以及r-阶矩相合性.     

误差ei为ρ混合序列在非线性模型下M估计的强相合性

对于非线性模型yi=f(xi,θ)+ei,i=1,2,…,n,当{ei,i=1,2,…,n}为ρ混合序列时,创造合适的条件,在此条件下证明了θ的M估计的强相合性.     

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