常利率因素的双险种风险模型

 引入了一类常利率因素的双险种风险模型,给出了初始准备金为0时破产概率Ψ(0)的明确表达式,初始准备金为u时破产概率的Cram啨r-Lundberg近似,及Ψ(u)的显式表达式和Lundberg上界.     

理赔额服从指数分布的多险种的风险模型

建立了多险种的泊松风险模型,并给出了破产概率满足的微积分方程以及初始资本为0时破产概率Ψ(0)的表达式,并就理赔额服从指数分布的情况给出了初始资本为u时破产概率Ψ(u)的表达式.     

两险种Poisson风险模型和破产概率

经典风险模型描述了单一险种的经营模式，事实上，保险公司经营的是多元化的险种.本文对两险种Poisson风险模型的破产概率进行了研究，给出了初始资本为0时破产概率Ψ(0)以及理赔额分别服从指数和混合指数分布且初始资本为“时破产概率Ψ(u)的明确表达式．     

一类两险种双Cox风险过程的破产概率估计

经典风险模型描述了单一险种且保费率是常数的经营模式.事实上保险公司经营是复杂的,险种是多元化的.考虑保费的到达和理赔的发生都服从Cox过程的两险种的风险模型,运用鞅论的方法,给出初始资本为u时破产概率Ψ(u)的明确表达式和其上界估计,以及累积强度相同且理赔额服从指数分布时的两险种双Cox风险模型的破产概率Ψ(u)的表达式.     

马氏风险模型破产概率的积分方程

重尾分布情形破产概率的估计是风险理论领域近年来极力寻求解决的热点问题 ,马氏风险模型就是针对这一问题首次建立并提出来的 ,在马氏风险模型中 ,顾客索赔到来由一个点过程 {N(t) } t 0描述 ,这里N(t)表示某一马氏跳过程在时间区间 [0 ,t]内的跳跃次数。该文主要研究了这个模型的破产概率 ,给出了破产概率Ψ(u)满足的积分方程和Ψ(0 )的明确表达式。     

复合负二项风险模型的破产概率

讨论了一般情形的复合负二项风险模型,得出了初始资本为。时的破产概率以及初始资本为u（u≥0）时的破产概率的一般公式．     

带有随机利率的复合Poisson-Geometric过程的破产问题

考虑利率的随机性,通过标准布朗运动和泊松-几何过程来描述一类破产问题,利用鞅方法,得到了Lund-berg基本方程,并给出了其解的两个有效应用,从而得到了破产概率Ψ(u)和盈余首次到达某给定水平x(x>u)概率Ψx(u)的一般表达式。最后给出了当个体理赔服从参数α为指数分布的Lundberg基本方程的两个具体解,由此可以进一步得到破产概率Ψ(u)和盈余首次到达某给定水平x(x>u)概率Ψx(u)的具体表达式。     

复合负二项风险模型下的破产概率

考虑了复合负二项风险模型下的破产概率.利用复合负二项分布与复合Poisson分布的关系,并利用古典风险模型下已有的一些结果,简单明确的得到了初始资本为u(u≥0)时的破产概率.     

马氏环境中的风险过程

本文引入随机环境建立了马氏环境中的风险过程 ,主要研究了马氏环境中风险过程的破产概率 Ψ(u) ,给出了 Ψ(0 )的明确表达式 ,并且证明了当初始资本 u趋于正无穷大时 ,Ψ(u)收敛于 0 ,及其收敛速率     

一类双险种风险模型的破产概率

对索赔次数为复合Poisson-Geometric过程的双险种风险模型进行研究,给出了初始资本为0时破产概率的具体表达式,并得到了在初始资本为u时破产概率的近似估计及指数分布下的表达式.     

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     

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