关于维纳过程增量的讨论

关于Winener过程增量有多大的研究前人已经得出了一些重要的结论,本文利用正态分布尾概率不等式和Borel-Cantelli引理等工具,对Wiener过程在区间[0,T]以及长度为aT的子区间上的一个线性组合的增量问题进行了探讨,得出了关于线性组合在区间[0,T]以及长度为aT的子区间上的增量有多大的一些重要结论,本结论是对Csórgó.M和Révész.P两人关于Winener过程增量有多大重要结果的推广。     

一类二维维纳过程加权和的增量讨论

通过二维Wiener过程的有限加权和形式,利用正态分布的尾概率不等式和Borel-Cantelli引理,对推广的二维Wiener过程的有限加权和在区间[0,T]、长度为aT的子区间的增量有多大问题进行讨论,得出类似于一维Wiener过程的有限加权和增量有多大的结论,该结论可视为一维Wiener过程增量结果的非平凡推广。     

二维加权维纳过程增量的探讨

提出二维Wiener过程有限加权和形式,并将Book和Shore所做一维Wiener过程增量有多大这一重要的结果椎广到加权二维Wiener过程场合,得出更一般的结论.     

一类两参数 Wiener 过程

本文讨论一类形为 W(x,n)的两参数 Wiener 过程,及其与单参数Wiener 过程相类似的连续模的几种形式.对于[2]中关于增量的与[4]中关于增量的的讨论,分别给出关于增量的与的相应结果。     

加权维纳过程增量大小的探讨

提出了维纳过程有限加权和形式，利用推广的尾概率的估计不等式和Levy连续模定理导出Wiener过程有限加权和形式增量有多大这一重要结果，是对Book和Shore所做结果的进一步推广．     

概率论极限理论中Wiener过程增量方向的研究取得新成果

最近以来,我校数理系刘坤会老师在Wiener过程增量方向的研究方面取得了可喜的新成果。 1983年D·Hanson和R·Russo于Ann、Prob,11期中发表了两篇文章,对Wiener过程某种增量表达式极限点分布问题进行了研究。刘老师讨论了与此问题相应     

有限区间上平稳 Poisson 过程增量及 Poisson 流的分布

在分析无限区间上强度为λ的Ｐｏｉｓｓｏｎ过程的基础上,提出了一类新的数学模型,即有限区间上的平稳Ｐｏｉｓｓｏｎ过程．得出了三个主要结论：有限区间上Ｐｏｉｓ－ｓｏｎ过程增量的分布,在有限区间上的Ｐｏｉｓｓｏｎ过程的增量是平稳的,有限区间上Ｐｏｉｓｓｏｎ流的分布密度．     

一类推广情形下的Pólya罐过程的收敛性

研究了一类在推广情形下的Pólya罐过程的收敛性问题.用耦合方法建立起推广情形下的Pólya罐过程和标准Pólya罐过程之间的联系,得到了推广情形下的Pólya罐过程在给定条件下的收敛性.     

关于Wiener过程连续模定理证明的注记

在Csorgo和Revesz关于Wiener过程连续模定理的证明中,有一处漏洞,本文指出并补上了这一漏洞.     

Hermite-Fejér插值在Wiener空间中的平均误差

在加权Lp范数意义下确定了基于Chebyshev结点组的Hermite-Fejér插值序列在Wiener空间下的平均误差的弱渐近阶.     

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.     

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.     

A computer generator for randomly layered structures

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

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

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