正规变化尾分布下破产概率的二阶展开式

考虑在经典风险模型中,假设索赔分布函数尾部是正规变化函数,首先求出正规变化函数n重卷积尾部的二阶展开式,再利用著名的Beekman卷积公式,得到破产概率的二阶展开式．从而使保险公司更清楚地了解自己的偿付能力．     

延迟更新过程大索赔破产概率的尾等价公式

Embrechts和Veraverbeke(Insurance :MathematicsandEconomics ,1 982 ,Vol.1 ,p55-p72 )研究了更新风险模型的破产概率问题 ,并且得到了在重尾索赔额的条件下破产概率的一个尾等价公式 .这个结果可以视为是对于经典的Cram啨ｒ Lundberg模型下相应结果的一个拓广 .本文指出在索赔额分布是重尾的情形下 ,对于延迟更新过程 ,Embrechts Veraverbeke的尾概率渐进等价公式仍然成立     

重尾索赔下二项风险模型破产概率局部渐近估计

本文对复合二项风险模型作进一步的研究,给出了在重尾索赔下二项风险模型破产概率局部渐近估计.     

一类重尾风险模型的有限时破产概率

考虑一类随机收取保费的重尾风险模型.与经典的风险模型相比,该模型考虑了保费收取过程的随机性,因而能够更好地刻画保险公司的运营风险.在索赔额服从强次指数分布的条件下,得到了当保险公司的初始资本x趋近于无穷大时,保险公司在时刻t之前破产的有限时破产概率的渐近估计.该渐近结果对于时间t具有一致性.     

有限次索赔时间间隔服从不同分布的复合更新风险模型下的破产概率

讨论了更具一般意义的复合更新风险模型下的破产概率,在假定索赔分布属于重尾分布族和服从不同分布的索赔时间间隔为有限的前提下,得到了所期望的破产概率的尾等价式．这一结果恰与经典的Cramfir-Lunderg模型下的结论一致．     

带随机干扰经典风险模型破产概率的局部定理

研究了带随机干扰的经典风险模型破产概率的局部定理,即假定个体索赔额是重尾分布的前提下得到了破产概率的一个局部等价式R(x,x z]~zρ-μF(x),其与Cramér-Lundberg模型中的结果完全一致,其中F表示索赔额的分布函数,μ为其均值,ρ表示模型的安全负荷系数,极限过程是x→∞.     

复合马尔可夫二项模型中的两个概率分布

讨论了复合马尔可夫二项风险模型,给出了破产前索赔次数的概率母函数,且在给定破产的条件下,得出破产后盈余过程恢复到非负值的索赔次数分布的递推表达式.     

Erlang(n)风险模型下破产时和破产前索赔次数的联合密度（英文）

研究了Erlang(n)风险模型下当索赔服从无穷可分分布时破产时和破产前索赔次数的联合密度表达式,并利用2个例子来加以说明.例1考虑了古典模型,得出的结论与Dickson(2012)一致,验证了本文方法的正确性.例2考虑了Erlang(2)模型下索赔服从Gamma分布的联合密度,说明了本文的新应用.     

风险投资和大额索赔下有限时间破产概率

考察了带风险投资的更新风险模型的有限时间破产概率.在索赔额分布属于长尾族和控制变化族的场合下,该模型分析了大额个体索赔情形下保险公司破产概率的渐近行为,并得到了有限时间破产概率的渐近表达式.     

相依风险模型中破产概率的一致渐近性

为了研究相依更新风险模型中的破产问题,首先研究了负相协更新计数过程,得到了该计数过程的一个渐近性结果;进而在此基础上考虑了相依重尾更新风险模型,其中索赔时间间隔为负相协同分布的随机变量,并且索赔额为独立同分布的随机变量,其共同的分布属于强次指数分布族;利用负相协随机变量的基本更新定理,得到了保险公司的有限时破产概率在时...     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

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.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with