离散型随机变量的概率密度函数及其应用

利用单位脉冲函数定义了离散型随机变量的概率密度,给出离散型随机变量与其独立的连续型随机变量和分布的计算公式,且证明其和分布不可能为正态分布。     

Kantorovich积分不等式的加强式及应用

从Kantorovich离散型不等式出发,推广到相应的积分型不等式,并给出构造性证明,又对其积分型不等式进行了加强,最后讨论了Kantorovich积分不等式加强式的应用.     

离散型随机变量的连续化方法

讨论了如何把离散型随机变量转化为连续型随机变量.首先给出了连续型随机变量与通过对其取整得到的离散型随机变量应该满足的两个充分必要条件,然后从不限定和限定连续型随机变量的分布这两个方面,给出了离散型随机变量连续化的几种方法,并且用这些方法分别解决了几何分布和离散韦布尔分布分别向指数分布和韦布尔分布的转化.     

构建以G(nλ1/xλ2)(λ1λ2>0)为核的半离散Hilbert型不等式的充要条件及应用#br#

利用权函数方法,证明具有非齐次核的半离散Hilbert型不等式:■成立的充分必要条件是■,并研究该不等式的最佳常数因子问题,给出其在算子理论中的应用.     

离散型随机变量连续化处理的方法

线性潜在结构方程式模型还仅限于研究连续型随机变量,对于各领域大量出现的离散型随机变量,还没有适用的线性结构方程式模型。因此,离散型随机变量连续化的研究具有重要的意义。对已知的离散型随机变量的分布律,通过分段线性插值,构造出相应的连续型随机变量的概率密度函数,使连续型与离散型随机变量有相同的数字期望和方差,并检验了两个随机变量分布函数的近似程度。     

半离散Hilbert不等式的推广

通过引进若干参数,构造了一个分式型半离散齐次核函数,由此建立一个一般形态的Hilbert型不等式.利用余切函数的部分分式展开,给出了新构建不等式常数因子的余切函数表示,并证明这一常数因子是最佳的.另外,赋予结论中参数不同的数值,文末还给出了一些特殊形式的不等式.     

鞅方法与一类强偏差定理

通过极限相对对数似然比，利用随机变量截尾的方法并结合Doob鞅收敛定理这一工具研究相依连续型和离散型随机变量序列的性质，得到了一类强极限定理及用不等式表示的强偏差定理，并推广了一些经典的强大数定律。     

二维随机变量独立性的研究

主要研究了二维离散型随机变量和二维连续型随机变量的独立性问题.给出了二维离散型随机变量相互独立的充分必要条件是其联合分布矩阵的秩等于1;二维连续型随机变量相互独立的充分必要条件是其联合概率密度为可分离变量.同时,对其应用进行了举例说明.     

一类新的非线性Volterra奇异积分不等式的离散模拟

对一类新的非线性Volterra型奇异积分不等式进行多时间步长的离散化,导出了相应离散不等式解的先验估计.所得结果可用于非线性Volterra型奇异积分方程的离散化数值处理.     

变系数差商不等式的无穷大模估计

Gronwall不等式在对偏微分方程近似解的估计中应用十分广泛,对差分方程做先验估计和误差估计时常常会遇到变系数的差分方程的情形。首先把离散的常系数Gronwall不等式推广到离散的变系数差商不等式,其次给出了离散的常系数Gronwall不等式的证明方法——归纳假设方法,并且利用归纳假设方法对离散的变系数差商不等式进行了证明,通过对差商不等式的适当放缩,最后得到了变系数差商不等式的无穷大模估计式。     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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