对称损失下一类指数分布族的Bayes估计

在对称损失函数下,研究了一类指数分布族尺度参数的估计,并研究了它的的可容许性.得到了尺度参数的Bayes估计的一般形式,在共轭先验分布下得到了尺度参数的Bayes估计的精确形式.在此基础上,讨论了一类形式如cT＋d估计量的可容许性和不可容许性. 更多还原     

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.     

对称熵损失函数下一类分布族参数的Bayes估计

在对称熵损失函数下,研究一类分布族参数的Bayes估计问题,并讨论了一类逆线性形式估计的可容许性和不可容许性。     

一种加权对称损失函数下Rayleigh分布尺度参数倒数的Bayes估计

首先给出了在加权对称损失函数下Rayleigh分布尺度参数的Bayes估计的一般形式.然后在给出先验分布的条件下,给出了Bayes估计的精确形式.最后证明了此Bayes估计的可容许性.     

Mlinex损失函数下Weibull分布的Bayes估计

基于Mlinex损失函数,在逐步增加Ⅱ型截尾样本下,讨论Weibull分布参数的Bayes估计．取逆伽玛分布为共轭先验分布,给出参数的Bayes估计,证明估计的可容许性．通过数值模拟,说明Mlinex损失函数下估计的稳健性．     

熵损失下Rayleigh分布尺度参数倒数的Bayes估计

在熵损失函数下研究Rayleigh分布的尺度参数倒数在不同先验分布下的Bayes估计并且讨论了其多层Bayes估计并证明该参数的Bayes估计是可容许的.     

复合Linex损失函数下Gamma分布的尺度参数的Bayes估计

在复合Linex对称损失函数下,当Gamma分布Γ（θ,α）的尺度参数θ（形状参数α已知）的先验分布π（θ）服从Gamma 分布Γ（λ,β）时,得到了尺度参数θ的唯一的Bayes估计δB.同时,对尺度参数θ的Bayes估计δB讨论了其可容许性.其结果是：当c=0,d＊＜d＜∞时,估计量δB是可容许估计.     

平方损失下逆威布尔分布参数的Bayes估计

在平方损失下,讨论逆威布尔(IW)分布参数的Bayes估计,并证明所给出的参数Bayes估计是可容许的.     

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.     

熵损失函数下幂函数分布和瑞利分布参数的Bayes估计

【目的】研究熵损失函数下幂函数分布和瑞利分布参数的Bayes估计并对它的可容许性进行验证。【方法】以幂函数分布及瑞利分布为基础,以熵损失函数为主要的损失函数通过参数估计的方法和性质进行证明和研究。【结果】证明得到任意分布在熵损失函数下参数的Bayes估计、先验分布为伽马分布熵损失函数下两个分布参数的Bayes估计,得到参数可容许性。【结论】得到参数的Bayes估计,同时得到两个分布的参数在熵损失函数下的Bayes估计是可容许的。     

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.     

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.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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