计算方幂和∑mk=1km的几个递推公式

如何简化方幂和的计算,一直是人们研究的一个热点问题,首先应用初等微积分知识给出一个积分恒等式,然后利用这个恒等式构造出一个结构简单、便于使用的计算方幂和的递推公式,进而再给出两个计算方幂和的简化的递推公式.     

计算方幂和m∑k=1K^m的几个递推公式

如何简化方幂和的计算，一直是人们研究的一个热点问题，首先应用初等微积分知识给出一个积分恒等式，然后利用这个恒等式构造出一个结构简单、便于使用的计算方幂和的递推公式，进而再给出两个计算方幂和的简化的递推公式。     

非线性动态模型中均值代替预测值的一种算法

针对一类特殊的非线性贝叶斯动态模型提出了一种新的递推算法,将均值代入状态方程,得到一个递推公式,不是把方程线性化,达到简化计算的目的．并给出其应用条件和递推计算程序．     

组合数运算的一个递推公式

利用初等的方法给出组合数运算的一个递推公式,并在此基础上得出两个组合恒等式。     

e一的二次Pade逼近多项式的递推公式

指数函数是非常重要的初等函数,它在微分方程中有特殊的作用,关于指数函数的二次Pade逼近的文献已有许多,但是关于指数函数的二次Pade逼近多项式的递推公式的文献,至今还没有看到.该文首先证明指数函数的二次Pade逼近多项式的一组微分恒等式,然后由这一组微分恒等式得到指数函数的二次Pade逼近多项式的递推公式,利用所给出的递推公式,就能够由指数函数的(m,n,r)型二次Pade逼近多项式计算出它的(m+1,n+1,r+1)型二次Pade逼近多项式.最后给出数值例子.     

与n-colour有序分拆相关的两个组合恒等式

给出了正整数ν分拆成m个分部量的n-colour有序分拆数的递推公式,并由这些递推关系得到了两个组合恒等式.     

关于二项式型多项式的注记

讨论了二项式型多项式的性质和与Bell多项式的关系及其应用,给出了一个二项式型多项式的递推公式,推广了现有文献的结果．得到了一些组合恒等式．     

e-x的二次Pade逼近多项式的递推公式

指数函数是非常重要的初等函数,它在微分方程中有特殊的作用,关于指数函数的二次Pade逼近的文献已有许多,但是关于指数函数的二次Pade逼近多项式的递推公式的文献,至今还没有看到.该文首先证明指数函数的二次Pade逼近多项式的一组微分恒等式,然后由这一组微分恒等式得到指数函数的二次Pade逼近多项式的递推公式,利用所给出的递推公式,就能够由指数函数的(m,n,r)型二次Pade逼近多项式计算出它的(m+1,n+1,r+1)型二次Pade逼近多项式.最后给出数值例子.     

e~(-x)的二次Padé逼近多项式的递推公式

指数函数是非常重要的初等函数 ,它在微分方程中有特殊的作用 ,关于指数函数的二次 Padé逼近的文献已有许多 ,但是关于指数函数的二次 Padé逼近多项式的递推公式的文献 ,至今还没有看到。该文首先证明指数函数的二次 Padé逼近多项式的一组微分恒等式 ,然后由这一组微分恒等式得到指数函数的二次 Padé逼近多项式的递推公式 ,利用所给出的递推公式 ,就能够由指数函数的 (m ,n,r)型二次 Padé逼近多项式计算出它的 (m + 1,n + 1,r+ 1)型二次 Padé逼近多项式。最后给出数值例子。     

包含奇-偶下标第一类Chebyshev多项式的恒等式

主要研究了第一类Chebyshev多项式，给出了一类包含奇一偶下标第一类Chebyshev多项式求和的递推公式及恒等式．     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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