不可估参数函数的可容许估计

对于线性模型ＥＹ＝Ｘβ,ＣｏｖＹ－∑＾ＭＩ＝１σＳ＾２Ｖｉ。当Ｓβ不可分别给出了Ｓβ的线性估计在二次损失和矩阵损失下线性可容许的充要条件。当Ｙ－Ｎ（Ｘβ,∑＾ＭＩ＝１σ＾２Ｖｉ）时,还得到了Ｓβ的线性估计在矩阵损失下在一切估计类中可容许的充要条件和在二次损失下在切估计类中可容许的充分条件和必要条件。     

矩阵损失下带约束多元线性模型回归系数可容许线性估计的特征

讨论矩阵损失下带约束多元线性模型中线性估计的可容许性问题,证明了约束条件下多元线性模型中线性估计KB的可容许性与约束条件下一元线性模型中线性估计Kβ的可容许性具有等价性;根据这一特征得出了多元线性模型中线性估计KB的估计LY是可容许估计的充要条件。     

约束条件下的非齐次线性估计的可容许性

刻划了线性模型在不等式约束ｌ’β≥０条件下的线性估计的可容许性,给出了非齐次线性估计可容许的一个充分条件和一个必要条件。     

正态均值线性估计的可容许性

假定多元随机变量Y~Nn(β,σ2V),β∈Rn,σ2>0未知,V≥0已知;讨论了均值向量β的线性估计的可容许性,并在二次损失函数‖δ(Y)-β‖2下,得到了均值向量β的线性估计可容许的充要条件.     

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.     

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。     

均值矩阵的线性估计在广义线性估计类中的可容许性

对于多元线性模型Y～(XΘ,σ2Σ(s)V),本文在最大特征值作为矩阵大小的比较标准下,讨论了XΘ的函数SXΘ的线性估计AY在齐次线性估计类中可容许与AY在齐次广义线性估计类中可容许的关系,还讨论了AY+D在广义线性估计类中可容许与AY在齐次广义线性估计类中可容许的关系.     

一般线性模型中共同均值线性估计的可容许性

对于协方差阵半正定的一般线性模型中共同均值的线性（包括齐线性与非齐线性）估计的可容许性问题进行了研究．给出了共同均值的线性组合Ｓβ的线性估计分别在二次损失和矩阵损失下可容许的充要条件，从而推广了胡飞芳（１９９１年）的结果．     

不等式约束下线性模型中回归系数的所有可容许估计

对于线性模型Y=Xβ+ε, ε~N(0,V]), V>0已知, 给出了在不等式约束RXβ≥0下[WTHX]β[WT]的线性估计在二次损失下及一切估计类中为可容许的充要条件.     

一般线性模型中共同均值线性估计的可容许性

对于协方差阵半正定的一般线性模型中共同均值的线性（包括齐线性与非齐线性）估计的可容许性问题进行了研究。给出了共同均值的线性组合Ｓβ的线性估计分别在二次损失和矩阵损失下可容许的充要条件，从而推广了胡飞芳（１９９１年）的结果。     

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.     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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~~