生灭过程自有限态“流入”的轨道性质

将生灭过程与游程理论结合起来,针对不唯一且附加态正则情形的生灭过程,引入了游程的相关概念,并在此基础上探讨了自有限态"流入"的那部分轨道结构的性质.     

It游程理论下生灭过程的构造

不唯一且附加态正则情形的生灭过程的轨道结构异常复杂,利用It游程理论研究了此类生灭过程的具体构造,回避了传统的＂分析＂方法.     

It?游程理论下生灭过程的构造

不唯一且附加态正则情形的生灭过程的轨道结构异常复杂,利用It?游程理论研究了此类生灭过程的具体构造,回避了传统的"分析"方法.     

一般形式的连续时间拟生灭过程各种遍历性判定准则及其应用

讨论了一般形式连续时间拟生灭过程各种遍历性，并给出连续时间拟生灭过程的指数遍历多项式遍历的一个新证明，该证明给出了具有某些特殊条件下连续时间拟生灭过程遍历性与离散时间拟生灭过程遍历性的之间关系。     

基于转移概率矩阵的生灭过程拟平稳分布新求解

针对生灭过程拟平稳分布的求解问题,本文提出了一种新的基于状态概率矩阵的求解方法.该方法利用生灭过程的状态变化特点及拟平稳分布的性质,通过Kolmogorov向前方程得到了生灭过程拟平稳分布的迭代解析式;并且根据纯灭过程自身状态变化特点,由Perron-Frobenius特征值特征变化求解了纯灭过程拟平稳分布的解析式.与以往利用收敛范数的方法相比,新方法降低了求解拟平稳分布的难度,具有一定的推广价值.     

一类生灭过程的渐近性质

根据生灭过程的自然尺度与标准测度的概率意义,研究了生灭过程的发散问题和一类生灭过程的渐近性质:一类生灭过程{Xt}t≥0在t→∞时,Xt是将以g(t)=(1+8t)1/2-1/2的方式发散到∞.     

单瞬时态单边生灭Q过程的常返性和遍历性

设Q为单瞬时态单边生灭矩阵，该文利用单边生灭Q－矩阵的定性理论和单时态Q过程的分解定理得到了单边生灭Q－矩阵存在常返Q过程和遍历Q过程的充要条件，并在Q－矩阵满足定理条件时构造了单边生灭常返Q过程和遍历Q过程。     

随机环境中的广义生灭过程的常返性

建立了连续时间的随机环境中的广义生灭过程（ＧＢＤＰＲＥ）模型,通过差分方程的计算,先得到固定环境的广义生灭过程（ＧＢＤＰ）的常返性,进而将环境随机化,得到随机环境中的广义生灭过程常返性的一个充分条件．     

双边生灭过程的轨道结构与Motoo理论

主要研究双边生灭过程的轨道结构和构造理论中的生灭过程与Motoo理论之间的对应关系,并且说明了构造理论中各个参数的概率含义.     

双边吸收边界生灭过程的特征值估计

用对偶方法给出双边吸收边界生灭过程第一特征值的精确II算子,进而给出该特征值的变分公式、显式估计和逼近定理.     

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