几种分布族中参数之待估函数可估性的判定

考虑总体是ξ的分布族{F（x,θ）,θ∈},其中θ=（θ_1,θ_2,…,θ_h）是待估计的 未知参数, 设g（θ）是参数θ的实值待估函数,从总体ξ中抽取i.i.d.样本（ξ_1,ξ_2,…,ξ_n）,如果存在统计量g（ξ_1,ξ_2,…,ξ_n）:R~((n))→,使得     

一类回归模型的M—估计的相合性

设有回归模型y_1=θ_1x_1r θ_2x_2 … θ_1x_p ε,t=1,2,…,N.(1)其中x_1,…,x是(非随机)自变量;ε是随机残差变量;y为因变量;θ_1,…,θ为回归参数。     

多维正态分布参数估计的损失函数和风险函数的Bayes估计

在N P（θ,Σ）和方差Σ已知情况下,给出了多维正态分布多维参数均值θ=（θ1,θ2,…,θΡ）估计的损失函数和风险函数的Bayes估计。     

一类刻度参数指数分布族参数的最小风险同变估计

对Parsian（1996）与Jozani（2002）所研究的一类刻度参数指数分布族c（x,n）θ^-ν e^-T（x）^/θ,利用文献[1]提出的p,q对称熵损失函数L（θ,δ）=θ^p/δ^p＋δ^q/θ^q-2（p,q〉0）,用参数估计方法,研究了刻度参数θ的最小风险同变估计与Bayes估计,并得到了它们的一般形式与精确形式,最后应用积分变换定理证明了Parsian（1996）未曾讨论的问题,即θ的最小风险同变估计具有最小最大性.     

二阶矩的最优二次无偏估计

设X1,X2,…,Xniid,EX1=θ,Var(X1)=σ∧2,在假定X1与N（θ,σ∧2）有相同的前四阶矩的条件下给出参数了τ=aθ∧2 bσ∧2 d的最小方差二次无偏估计,统一和推广了一些已有结果。     

M-估计的强相合性

本文在x1，x2，…，xn，…为非随机变量的情况下讨论了模型y1=f（xi，θ）＋εi i=1，2，…，n下的M-估计θn的强相合性，其中θn满足∑^ni=1p（yi-f（xi,θn））=minθ∈⊙ ∑^ni=1p（yi-f（xi,θ））给出了M-估计具有强相合性的一个充分条件。     

两个方差分量的线性函数的非负可估性

一、问题的提出考虑模型■ (1.1)其中 rk(x)=r≤p相似文献   

二阶矩的最优二次无偏估计

在假定X1与N（θ,σ^2）有相同的前四阶矩的条件下给出了参数τ的最小方差二次无偏估计,并统一和推广了一些已有结果。     

某类均匀分布参数极大似然估计及优良性的讨论

讨论了双参数均匀分布U=[θ1-1/2θ2,θ1＋1/2θ2]中未知参数θ1,θ2的极大似然估计的均方误差和相合性,表明参数θ2修正后的极大似然估计均方误差较小,并给出未知参数θ1,θ2的UMVUE.     

具有非卷积型核的多线性Littlewood-Paley算子在Campanato空间上的新估计

考虑具有非卷积型核的多线性Littlewood-Paley算子在Campanato空间上的有界性,其中包括多线性g-函数,多线性Lusin面积积分S和多线性g_λ*-函数.证明了如果f=(f_1,…,f_n),f_i∈ε~(α_i,p_i)(R~n),i=1,…,m,那么g(f),S(f),g_λ*(f)几乎处处等于无穷或几乎处处有限,且在后一种情形下,算子[g(f)]~2,[S(f)]~2,[g_λ*(f)]~2从ε~(α_1,p_1)(R~n)×…×ε~(α_m,p_m)(R~n)到ε_*~(2_(α,p)/2)(R~n)是有界的.     

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

正~~