逆高斯分布参数的估计

在给出逆高斯分布参数μ及β的极大似然估计和矩估计的基础上,验证了参数μ的样本均值的无偏性及相合性.     

正态总体参数容许分析

对一般正态分布N（μ，σ^2），在参数μ已知及未知条件下，σ^2的容许估计进行了讨论，并得到了一个在μ未知时，σ^2的一个容许估计。     

Nekrasov-矩阵逆矩阵的无穷大范数的新上界

目的研究Nekrasov-矩阵逆矩阵的无穷范数估计问题。方法利用矩阵分裂构造含参数的严格对角占优矩阵,并结合Nekrasov-矩阵的等价定义及不等式放缩技巧,估计Nekrasov-矩阵逆的无穷范数的上界。结果给出一个含有可调节参数μ的新上界。结论数值算例表明当选取适当的参数μ时,新的上界估计式优于现有的结果。     

寿命分布中位置参数和尺度参数的区间估计

型分布是可靠性试验中常见的一类寿命分布，其分布参数μ、σ的区间估计，一直是可靠性统计分析关心的问题之一。本文借助次序统计量讨论了μ、σ均未知情况下各自的区间估计，并利用极大似然估计及渐近性讨论了μ、σ近似区间估计。本文方法适用于全样本情况和截尾样本情况。     

Linex损失函数下正态总体位置参数的估计

首先研究正态分布位置参数在Linex损失函数L(μ,)δ=ea(μ-δ)-a(μ-δ)-1下的最小风险同变估计及其Bayes估计,并给出在该损失函数下位置参数最小风险平移同变估计的精确表达式和Bayes估计的可容许性证明,最后讨论形如cT(x)+d的可容许性.     

正态分布参数函数的估计

讨论正态分布N(μ,σ2)的参数(μ,σ2)的函数θ=exp{aμ ba2}(a≥0,b≥0)的估计问题,给出了θ的最大似然估计及矩估计.在μ和σ2的先验分布独立时,在损失函数L(θ,a)=(θ-a)2和L(θ,a)=(θ-1×a-1)2下给出Bayes估计和最小最大估计.     

恒加试验中F(t-μ/σ)型寿命分布参数线性无偏估计的改进

给出了F(t-μ/σ)型寿命分布在恒加试验中，加速方程的两个系数a和b，以及尺度参数σ的一种新的最优线性无偏估计，所得到的估计比常用的加权最小二乘估计a和b，以及线性无偏估计σ的方差更小，且计算较为简便。最后，讨论了常见F(t-μ/σ)型寿命分布参数μ、σ在定时截尾试验下的近似无偏估计以及它们的方差、协方差。     

逆高斯分布的参数经验Bayes估计

本文在当参数μ已知时,在平方损失下给出了参数的Bayes估计,进一步利用核密度估计方法构造了参数θ的经验Bayes估计函数,并在一定的条件下,证明了所提出的经验Bayes估计函数的收敛速度.     

半参数TBS模型的局部线性估计

研究了半参数多元回归模型E(Y|X)=μ(XTβ),其中X是维数为p的列向量,μ,β是未知参数.由于此模型不容易满足误差方差齐性和误差分布正态性,作者对该半参数回归模型两边同时应用含参数λ的Cox-Cox变换,使得变换后的回归模型满足误差方差齐性和误差分布正态性条件,然后应用局部线性技术及极大似然方法,通过两步迭代,对未知参数β,λ及未知函数μ(.)进行了估计.     

非倍测度下参数型Marcinkiewicz积分多线性交换子的一些估计

当假设测试μ满足多项式增长的条件时,得到了参数型Marcinkiewicz积分与Lipβ(μ)函数生成的多线性交换子Mρ-bf(x)具有(Lp(μ),Lp(μ))的有界性,以及在H1(μ)空间的端点估计,从而推广了参数型Marcinkiewicz积分单线性交换子的相关结果.     

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