固定设计下半参数回归模型小波估计的收敛速度

对一类固定设计下的半参数回归模型进行了研究.通过利用加权最小二乘法及小波估计法给出了未知参数β和未知函数f(·)、g(·)的估计;在较弱的条件下给出了最终加权二乘估计βn的弱收敛速度,(^f)n(·),的弱收敛速度、强相合性以及(g-)n(·)的弱收敛速度.     

带有线性测量误差的半参数EV模型的估计

研究一类带有线性测量误差的半参数EV模型的估计问题.通过综合利用核光滑方法、修正最小二乘法和广义最小二乘法给出未知参数和未知函数的估计.在一般条件下,证明了未知参数估计的渐近正态性并给出了未知函数估计的收敛速度.     

NQD样本下部分线性模型中估计的强相合性

考虑回归模型：yi=xβ g(ti) σei≤i≤n,其中δ^1 i=f(ui),(xi,ti,ui)是固定非随机设计点列,β是未知待估参数,g和f是未知函数,随机误差序列{ei}为同分布的NQD序列．在一定的条件下,得到了β的最小二乘估计β、加权最小二乘估计β^-和最终加权最小二乘估计β^-的强相合性．     

开环门限自回归模型

讨论了开环门限自回归模型的参数估计,在一定条件下证明了参数的最小二乘法估计的相容性,并给出了参数的收敛速度.     

半参数回归模型随机加权估计的渐近展开

指出对简单的半参数回归模型y=xβ＋g（t）＋ε,在进行参数估计时,为避免利用BOOtstrap法需进行重新抽样,应用随机加权法构造了涉及参数β的最小二乘随机加权估计量λ,并且在适当的条件下获得了λn分布的Edgcworth展开,其收敛速度可达到O（n^-1/2）。     

END序列下半参数回归模型估计的相合性

研究误差为END序列的半参数回归模型y_i=x_iβ+g(t_i)+σ_iε_i(i=1,2,…,n).应用加权估计与最小二乘估计方法,建立未知参数β和未知函数g的最小二乘估计与加权最小二乘估计的估计量.利用END序列的Rosenthal不等式以及截尾的方法证明p(p1)阶矩的相合性.     

正态分布下无失效数据的可靠度分析

针对正态分布场合下无失效数据的情形,利用最小二乘估计,加权最小二乘估计和模糊加权最小二乘估计三种方法,给出正态分布参数和可靠度的计算方法.     

完全样本下威布尔分布参数的加权最小二乘估计

借助图法估计的思想和次序统计量的性质,给出了完全样本下威布尔分布参数的改进最小二乘估计与加权最小二乘估计.     

缺失数据下半参数回归模型的局部线性光滑

在缺失响应变量的不完全数据下,对半参数回归模型进行研究.利用最小二乘和局部线性回归拟合方法建立缺失数据下半参数回归模型参数分量和非参数分量的局部线性估计.在适当的条件下,得到^βn,^nσ的渐近正态性和^gn(t)最优弱收敛速度.     

部分线性模型中非参数估计的强相合性

考虑部分线性模型:y_i=x_iβ+g(t_i)+σ_ie_i,1≤i≤n,其中σ_i~2=f(u_i),(x_i,t_i,u_i)是固定非随机设计点列,f(·)和 g(·)是未知函数,β是待估参数,e_i 是随机误差。我们研究了基于β的最小二乘估计β_n 和加权最小二乘估计_n 的非参数 g(·)的估计,并证明了他们的强相合性。     

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