计算再生核的一种新方法

再生核的计算一直都是一个难题。本文利用卷积算子和H1(R)的再生核函数给出了一种计算Hn(R)的再生核的新方法。利用这种方法计算再生核简便易行。所以可以说这种方法成功地解决了这一难题     

计算再生核的一种新方法

再生核的计算一直都是一个难题。本文利用卷积算子和H^1(R)的再生核函数给出了一种计算H^n（R）的再生核的新方法。利用这种方法计算再生核简便易行。所以可以说这种方法成功地解决了这一难题。     

再生核空间W_2~1(R)中的分段投影插值

本文在具有再生核的空间W_2~1(R)中讨论分段插值问题,给出W_2~1(R)的再生核的解析式,并构造一个分段插值公式。     

基于最小二乘支持向量机的信号回归

基于支持向量机核函数的条件和Sobolev Hilbert空间H1(R;a,b)的再生核,提出了一种称为最小二乘支持向量机的新的回归模型,并将该回归模型应用于信号回归的仿真实验中.实验表明,最小二乘支持向量机的核函数采用再生核是可行的,它优于常用的高斯核函数.     

再生核空间W2^1（R）上的有界线性算子的最佳逼近问题

利用泛函分析工具和逼近的方法得到了由再生核空间W2^1（R）到连续函数空间C（R）上的有界线性算子的一些性质,进而在等度连续的条件下给出了一种最佳逼近的表达式．     

传染病模型中的马尔萨斯常数(英文)

建立了一个随机传染病模型,此模型中传染个体可能具有多样化的疾病传播模式.利用最近一个关于算子谱半径连续性的结果,证明了汉基本再生数R0>1时,在一个疾病大爆发的初期,染病人口的数量呈指数增长,而染病人数的本质增长率就是基本再生核的马尔萨斯常数.     

基于小波多分辨分析的再生核

再生核Hilbert空间是连续小波变换的基础，在小波多分辨分析理论的基础上，再生核理论和小波分析理论有着很深的联系，针对小波变换不同尺度下的尺度空间，存在一系列再生核，这些再生核具有一定的联系，特别是强一层空间的尺度核和弱一层空间的尺度核之间有相应的内积关系，同时不同小波空间的再生小波核也具有类似于尺度核的相关性。     

具有再生核Hilbert空间中紧的偏微分算子

用再生核函数来刻画再生核空间中算子的性质,是研究再生核空间性质的一个重要方法.在本文中,研究了具有再生核的多元整函数Hilbert空间的基本性质,着重讨论了偏微分算子在该空间上的紧性,给出了一个用再生核函数刻画的偏微分算子是紧算子的充分必要条件,从而在具有再生核的多元整函数Hilbert空间上推广了已有的结果.     

再生核空间算子样条插值函数

在具体的再生核空间Ｈ＾１０中，解出了再生核的解析表达式，并建立了空间Ｈ＾１０中的微分算子样条插值函数与再生核的联系，丰富了再生核空间微分算子样条函数的一系列重要性质。     

再生核空间H^10中分段再生核插值函数

在再生核空间Ｈ＾１０中，以其再生核作为插值逼近的基函数，构造了分段再生核插值函数，并讨论了该插值函数的最佳性质。     

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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