熵损失函数下一类广义分布族参数估计的容许性

在熵损失函数下,研究了一类分布族参数的Bayes估计和可容许估计,并讨论了一类(cT+d)-1形式估计的可容许性和不可容许性.     

基于熵损失函数和定数截尾情形下一类分布族参数的估计

基于定数截尾和熵损失函数,得到了一类分布族参数的Bayes估计和可容许估计,并讨论了一类(cT+d)-1形式估计的可容许性和不可容许性.     

向量损失下共同均值向量的线性可容许估计

在向量损失函数下,利用矩阵的向量化方法,分别研究了多元线性模型和增长曲线模型中共同均值向量的线性估计在齐次线性估计类L2={C1Y1 C2Y2 … CnYn,Ci为k×m阶矩阵,i=1,2,…,n}及L3={A1Y1B1 A2Y2B2 … AnYnBn,Ai,Bi分别为l×m,q×s阶矩阵,i=1,2,…,n}中的可容许性;得到了线性估计在齐次线性估计类中可容许的充分和必要条件,推广了相关结果.     

对称熵损失函数下两参数广义指数分布形状参数的Bayes估计

在对称熵损失函数下,讨论了两参数广义指数分布形状参数的Bayes估计和可容许估计,并给出了一类逆线性形式(cT+d)-1估计的可容许性和不可容许性的条件.     

方差分量模型中均值参数的可容许线性无偏估计类

对（y,Xβ,^k∑i=1θiVi）,Vi〉0,i=1,2,……,k,首先给出了Sβ的线性无偏估计ψr不可容许的充要条件,然后得出了Sβ的线性无偏估ψT可容许的充要条件,从而,在此基础上给出了Sβ的可容许线性无偏估计类。     

标准伽玛分布均值的非齐次线性估计可容许性

设x1,x2,,xn为独立标准伽玛分布的随机变量,即xi服从Γ(λi,1),i=1,,n.在矩阵损失函数(Ax c-λ)(Ax c-λ)′下,我们给出了非负、非齐次线性估计类中非齐次线性估计可容许的一些充分条件。     

方差分量模型中回归系数估计的可容许性(Ⅱ)

本文考虑方差分量模型Y～N(X β,σ_1~?V_1 σ_2~2V_2)中β的函数g(β)的估计在一般估计类D_1中且在平方损失下的可容许性问题.给出了当X=In时β的估计AY为D_1可容许的充分条件.以及可估函数Sβ的估计AY为D_1可容许的充分条件.同时给出了可估函效Sβ的非齐次线性估计AY a为D_1可容许的充要条件及充分条件.本文还讨论了在矩阵损失下方差分量模型中回归系数估计的可容许性,并得到了估计量为可容许估计的充分条件.     

熵损失下Poisson分布参数倒数的估计

研究在熵损失函数下 ,Poisson分布参数倒数的估计 ,得出在熵损失下 ,[c T( X ) d] -1 形式的一类估计的可容许性和不可容许性 ,并给出可容许估计的充要条件     

约束条件下误差协方差阵的二次型估计的可容许性

估计的可容许性一直是模型估计理论的重要部分,其主要包括系数估计的可容许性与误差估计的可容许性。随着统计模型的不断扩展与完善,各种有关的容许性理论也在不断的更新和完善之中。作为椭圆约束下一元模型中误差估计的可容许性向高维的一种推广,本文主要讨论在不等式约束条件下多元线性模型中误差协方差阵V的二次型估计的可容许性,得到了在二次型估计可容许的必要条件以及rk（x）=1与x=（1,1,…,1）T情形下可容许估计的充要条件等结果。     

基于对称熵损失和记录值的一类分布族参数的估计

在对称熵损失函数下,基于记录值样本,得到了一类分布族参数的Bayes估计和经验Bayes估计,并讨论了一类逆线性(cT+d)-1形式估计的可容许性和不可容许性.     

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