关于平均值不等式的新应用

利用平均值不等式推得Holder不等式和在数学竞赛题中有广泛应用的"分式和"不等式.此外,通过平均值不等式建立了一个应用非常广泛的新不等式.     

均值不等式的推广

不等式在初等数学中占有重要的地位.不等式的证明经常要用到算术平均值、几何平均值、调和平均值和平方平均值之间的关系.本文着重讲述了这几种均值不等式之间的关系,对他们之间的关系加以推广,并给予证明.     

F.Holland猜想的推广

利用不等式的经典理论和归纳法证明了如下结果设xi>0 (i=1,2,...n),且二维递归数阵{qik}满足文中递归关系式(3),由此给出F.Holland猜想混合算术-几何平均不等式的一个更一般的加权幂平均值推广.     

平均值不等式再讨论

将传统平均值不等式的求和项个数拓展到可变个,重新讨论了平均值不等式.通过定义体积函数,给出了体积函数的两个等价函数表示,来验证它的基本分析性质.     

r-凸函数与几个重要不等式的联系及应用

从凸函数定义出发,引入并研究了一类广义凸函数——r-凸函数,利用极限等数学工具,证明了它包含凸函数、拟凸函数、对数型凸函数作为其特例.同时,证明了它的一些性质,利用其性质,给出了几何平均值、代数平均值、调和平均值、柯西不等式几个重要不等式间的联系.最后,给出了r-凸函数在不等式证明中的应用.所得的结果统一和发展了一些已有的工作.     

含参数的混合算术—几何不等式及其应用

提出两个含参数的混合算术－几何平均值不等式并指出它们在非线性规划问题中的应用。     

一个"母"函数不等式的高维推广

将一个重要的"母"函数不等式作了高维推广,并由它得到了m维空间的一系列不同类型的函数不等式,它们是算术-几何平均值不等式、柯西不等式等的联合推广.     

广义混合变分不等式的Tikhonov正则化方法

极小化问题可以转化为变分不等式,因此,变分不等式是解决极小化问题的一类重要方法.当变分不等式模型中的集合无界时,许多学者研究了各种各样的强制条件,以保证变分不等式的解存在.比较了几种主要强制性条件之间的关系,并在映射具有变分不等式性质时,给出了广义变分不等式解存在的证明,并且用Tikhonov正则化方法解决了不适定广义变分不等式解的存在性问题.广义混合变分不等式是比广义变分不等式更一般的模型,将广义变分不等式的Tikhonov正则化方法推广到广义混合变分不等式,以使Tikhonov正则化方法具有更加广泛的应用范围.为此,主要建立广义混合变分不等式的Tikhonov正则化理论.首先,在更弱的强制条件下,证明了广义混合变分不等式解的存在性,然后给出了广义混合变分不等式的Tikhonov正则化结果.     

对均值不等式的探讨

均值不等式是高中数学的一个教学内容,虽然仅仅占了一个课时,但在历年的高考题中却占着举足轻重的地位,本文介绍了几种常见的平均值,并且运用几何的观点构建了一些不等式,而这些不等式由简单的二维入手,再到多维的拓展,更能充分地说明不等式的一些特征.其中算术——几何平均值在不等式理论中处于核心地位,它在高中数学中有着广泛的应用,在这里本文巧妙地利用均值不等式来证明不等式、求函数的最值以及证明三角函数不等式,并在此基础上,给出一个均值不等式的推广,它是均值不等式的一个延伸.     

算术-几何平均值与几何-调和平均值的注记

给出算术-几何平均值与几何-调和平均值之间的一些基本关系式和有关的不等式,并且把它们与常见的几类复合平均值做了比较.     

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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