β级α型λ-Bazilevi函数的对数系数

利用从属关系给出(g(z)/f(z))α的估计,并运用构造一个非负函数和对复变函数模的积分进行估计的方法,研究β级α型λ-Bazilevi函数类B(λ,α,β)的对数系数b_n,得到|b_n|≤(Alog n)/n+B/n+32β/(1-|1-2β|),其中A、B是绝对常数,推广了相关结果.     

矩阵特征值在椭圆形区域上的估计

矩阵特征值的估计在理论和应用上都非常重要,传统估计的结果都是用圆形、卵形等区域来定位的。本文寻求一种新的方法来定位复矩阵特征值的分布范围,给出了任意n阶具有实系数特征多项式的矩阵特征值都包含在下面的椭圆形区域内β2(x-trA/n)2+α2y2≤α2β2,其中α=[(n-1)/n∑nk=1(Reλk-trA/n](1/2),β=[(n-1)/n∑nk=1(Imλk)2](1/2)。最后给出了更精确的估计区域,进一步改进了已有的一些结论。     

空间自回归模型中的强相合性

(n,n)表示在空间自回归模型Zij=αZi-1,j βZi,j-1-αβZi-1,j-1 εij中参数(α,β)的Guass-Newton估计,根据已知的结论:当α=β=1时,{n3/2)((^αn)-α,(^β)n-β)}收敛于二元正态随机向量分布即limn{n3/2(^αn)-α,(^β)n-β))′}(D→)N2(0,Γ),其中Γ=diag(2,2).利用双参数强鞅收敛定理,可以证明,当r<(3)/(2)时,nr(n-α,n-β)→(-0).a.e.     

一类Ruscheweyh型α-凸函数

本文考虑■内满足条件■,■的解析函数■,构成的类H(n,p,α,β),这里p是正整数,n是大于-p的任意整数,0≤α≤1,■表示■与f(z)的Hadamard乘积.我们得到了使得H(n,p,α,β),含于H(n,P,0,δ)的最大的δ.对类H(n,p,α,β),准确的系数估计和偏差定理也被给出.     

一类具有负系数的单叶函数

引进新的函数类L*n(α,β,γ),即一类满足某些条件且具有负系数的单叶解析函数类,并研究了L*n(α,β,γ)的一些性质、系数估计、偏差定理及极值点问题.     

矩阵损失下随机效应模型回归系数的齐次线性MINIMAX估计

对于随机效应模型{Y=Xβ ε E(βε)=(Aα0) Cov(βε)=σ2(V1 00 V2),(Vi＞0,i=1,2)这里β和ε分别为p维和n维的随机向量.我们对β和α的可估函数Sα Qβ进行估计,在一定条件下,得出了可估函数Sα Qβ在齐次线性估计类中的唯一的MINIMAX估计.     

一类单叶函数的Fekete-Szeg(o)问题

设f(z)=z+(∞∑n=2)anzn∈B(α,β,γ),其中B(α,β,γ)是一α型β级巴西列维奇函数类,本文讨论了B(α,β,γ)中函数f(z)的Fekete-Szeg(o)问题,得到了| a3-λa22|(0≤λ≤1)的准确估计,一些已知的结论是本文的特例.     

一类单叶函数的Fekete-Szeg问题

设f(z)=z ∑n=2anzn∈B(α,β,γ),其中B(α,β,γ)是一α型β级巴西列维奇函数类,本文讨论了B(α,β,γ)中函数f(z)的Fekete-Szeg问题,得到了|a3-λa22|(0≤λ≤1)的准确估计,一些已知的结论是本文的特例.     

一类单叶函数的Fekete-Szeg问题

设f(z)=z+(∞∑n=2)anzn∈B(α,β,γ),其中B(α,β,γ)是一α型β级巴西列维奇函数类,本文讨论了B(α,β,γ)中函数f(z)的Fekete-Szeg(o)问题,得到了| a3-λa22|(0≤λ≤1)的准确估计,一些已知的结论是本文的特例.     

基于Jacobi多项式零点的拟Grünwald插值算子

考虑基于一般Jacobi多项式Jn(x)=J(α,β)n(x)(0≤α,β<1)零点∪{-1,1}的拟Grünwald插值多项式G*n(f,x),证明了G*n(f,x)在(-1,1)内几乎一致收敛于连续函数f(x),并给出点态逼近估计.     

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.     

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.     

A computer generator for randomly layered structures

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

Perspherical Approaches for Electrons in Atoms and Charged Excitons in Quantum Wells

Instead of following Fock’s expansion,we solve the Schrodinger equation for some quantum mechanical manybody systems such as electrons in atoms and charged excitons in quantum wells in a similar way in hyperspherical coordinates by expanding the wave functions into orthonormal complete basis sets of the hyperspherical hannonics(HHs)of hyperangles and generalized Laguerre polynomials(GLPs)of the hyperradius.This leads the equation to     

Advances in broadband wireless communications under high-mobility scenarios

Future mobile communication systems aim at providing very high data transmission rates, even in high-mobility scenarios such as high-speed wheel-track trains, maglev trains, highway vehicles, airplanes, guided missiles or spacecraft. A particularly important commercial application is the strong and increasing worldwide demand for high- speed broadband wireless communications （up to 574.8 km/ h test speeds or 380 km/h commercial speeds） in railways, providing data, voice and video services for applications such as onboard entertainment services to passengers, train control, train dispatch, train sensor status handling and sur- veillance. In such high-mobility scenarios, there are a number of communication challenges, including fast hand- over, location updating, high-speed channel modeling, estimation and equalization, anti-Doppler spreading tech- niques, fast power control, and dedicated network architec- ture. Because signal transmission in very high-speed scenarios will inevitably experience serious deterioration, it is imperative to develop key broadband mobile communi- cation techniques for such high-speed vehicles.     

Wuhan University Journal of Natural Sciences TOTAL CONTENTS

<正>~~     

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。     

Scale-based spatial data model for GIS

Being the primary media of geographical information and the elementary objects manipulated, almost all of maps adopt the layer-based model to represent geographic information in the existent GIS. However, it is difficult to extend the map represented in layer-based model. Furthermore, in Web-Based GIS, It is slow to transmit the spatial data for map viewing. In this paper, for solving the questions above, we have proposed a new method for representing the spatial data. That is scale-based model. In this model we represent maps in three levels: scale-view, block, and spatial object, and organize the maps in a set of map layers, named Scale-View, which associates some given scales.Lastly, a prototype Web-Based GIS using the proposed spatial data representation is described briefly.     

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     

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