整值随机变量期望的一个表示式的应用与推广

建立了整值随机变量高阶矩的一个递推公式 :Eξr 1 =( r 1) [∑∞k=1kr P(ξ≥ k) -∑rk=1ak Eξk ]其中 ak 满足等式 ∑nk =1 kr=∑r 1k=1 aknk,此公式是表示式 Eξ=∑∞k =1 P(ξ≥ k)的推广 ,此外给出此公式的一些应用     

不同分布的随机中心极限定理

引言设{ξ_k}是独立同分布的随机变量序列,其均值Eξ_k=0,方差D(ξ_k)=1,(k=1、2…)。记η_n=sum from K=1 to=n(ξ_k) ξ_n=η_n/n~(1/2) 那么独立同分布的中心极限定理成立,即 n→∞P(ξ_n相似文献   

鞅差序列重对数律的精确渐进性

设{Xn;n≥1}为均值为零,方差有限的同分布鞅差序列.记Sn=∑nk=1Xk,Mn=max k≤n|Sk|,n≥1.假设σ2=EX12.本文讨论了,当ε→0时,P(Mn≥εσ2nloglogn~(1/2))的一类加权级数的精确渐近性质.这些性质与重对数律的速度有关.     

关于恒等式e^x=∑n≥0LnJn（2x）的证明

关于恒等式e^x=∑n≥0LnJn（2x）已有组合证明，本文将用微积分的方法证明该恒等式，其中L0=1,L1=1,L2=3,Ln＋1=Ln＋Ln-1（n≥2）,Jn（2x）=∑k≥0（-1）^kx^n＋2k/k!（n＋k）!.     

非平稳序列M(1)n和M(2)n的联合分布

{ξi,I≥1}为标准化的正态序列,rij=Cov(ξi,ξj).M(k)n是{ξi,I≥1}第k个最大值,L (k) n是其出现的位置,文章在条件:j-I→∞时rijlog(j-I)→γ∈(0,∞)下,得到了M(1)n和M(2)n的联合渐近分布.     

一类鞅差序列加权和的Baum-Katz大数定律的精确渐近性

设{(ξ1,ζ1),1≤i＜∞)为适应的鞅差序列,{Cnk:1≤k≤n}为双下标常数列,文章获得了一类鞅差序列加权和Sn=n∑k=1Cnk(ξ)k的Baum-Katz大数定律的精确渐近,给出了∑n≥＞1nr/p-2P(|Sn|≥∈n1/p),∑n≥11/P(|Sn|≥∈n1/p)当∈→0时的精确渐近性.     

非负WOD随机变量的第k小矩不等式

设{x_n,n≥1}为正数序列,{ξ_n,n≥1}为非负的WOD随机变量序列,其分布满足适当的条件.首先利用WOD随机变量的定义建立最小值min1≤i≤nx_iξ_i的一个指数不等式.利用此指数不等式,进一步研究非负WOD随机变量的第k小(E(k-min1≤i≤n|x_iξ_i|~p))~(1/p)的矩不等式,其中p0,k=1,2,…,n.本文中所得结果推广独立变量和NOD变量的相应结果.     

长程相依过程精确渐近性的一般结果

设{εk,-∞k∞}为零均值的独立同分布序列,令长程相依过程∞{Xt=∑akεt-k,t≥0},其中{ak,k≥0}为满足条件ak~k-αl(k)的实数序列,1/2α1,k=0l(k)为缓变函数.利用长程相依过程的弱收敛定理和矩不等式,对边界函数和拟权函数得到了矩完全收敛性的精确渐近性的一般结果.     

关于Van der Corput不等式的进一步改进

对Van der Corput不等式进行了研究，并将其进一步改进如下：设αn≥0,Sk=∑m=1^k 1/m,则∑n=1^∞（∏k=1^nαk^1/2)^1/sn≤e^1 γ∑n=1^∞ e^-1/4n(n-1/3n logn)αn，其中γ为Euler常数。     

随机环境两性分枝过程的p阶矩

利用递推和数学归纳法,研究了随机环境两性分枝过程{Wn}n的p阶矩,得到了supn≥0EWnp∞的3个充分条件。特别地,当环境序列ξ为独立同分布时,第3个充分条件Elog+Eξ[f01/μ1(ξ)]p0∞将成为supn≥0EWnp∞的充要条件。     

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.     

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.     

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.     

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.     

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.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

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.