一类关于A—单调算子的广义变分包含组

在Hilbert空间中,引入并研究了一类新的关于A-单调算子的广义变分包含组问题,利用不动点定理证明了这类广义变分包含组解的存在性和唯一性,并且利用A-单调映像的预解算子技巧研究了这类变分包含组解的迭代算法逼近,及由算法生成的迭代序列的收敛性。     

Banach空间中一类变分包含组问题的扰动算法和稳定性

讨论一类含极大η-单调算子的广义非线性混合似变分包含组的迭代算法．依据不动点理论和极大η-单调算子的预解算子技巧，提出了一种求这类变分不等式组的逼近解的新的扰动迭代算法，证明了这类算法的收敛性和稳定性，并推广和统一了近期文献中的一些相关结论．     

一种求解变分包含问题的Man迭代算法

首先回顾了与变分包含问题相关的一些基本概念。然后介绍H-单调算子的概念,接下来考虑一类带有H-单调算子的变分包含问题,该类变分包含问题可以涵盖前人研究过的几类变分问题和变分不等式问题,从而表明该类问题是已研究问题的有效推广深入研究。接下来笔者给出了预解算子的概念,并利用该概念进一步建立了变分包含问题与某个不动点问题的等价性。这种等价性允许使用预解算子技巧提出一种新型的Man迭代算法。最后对算法的收敛性进行了分析,在所给定理条件下,利用文献[3]中被广泛应用的一个引理,不仅可以证明这类变分包含问题存在唯一解,而且可以保证所提的新型Man迭代算法最终强收敛到原问题的唯一解。     

关于一类非线性变分不等式的可解性

在Hilbert空间中引入了一类非线性变分不等式,建立了这类非线性变分不等式近似解的扰动迭代算法,证明了此类非线性变分不等式解的存在性和唯一性,并讨论了由该迭代算法所产生的迭代序列的收敛性.     

强单调有界Lipschitz算子方程解的迭代算法

设H为实Hilbert空间,A:H→H为强单调有界Lipschitz算子. Brezis提出了一种迭代算法逼近算子方程Ax=f之唯一解, 其中f∈H任意取定.指出了Brezis迭代算法及其收敛性证明中的一个错误,给出了正确的迭代格式以及收敛性证明,并把所得结果推广应用于变分不等式解的迭代算法.     

Hilbert空间中一类集值变分包含

在Hilbert空间中引入并研究了一类涉及广义极大单调映象的集值变分包含问题．利用预解算子技巧构造这类变分包含解的迭代逼近算法，证明了解的存在性以及由算法生成的迭代序列的收敛性．     

关于极大η-单调映象的广义变分包含

应用预解算子方法，引入和研究了Hilbert空间中一类新的关于极大η-单调映象的广义变分包含，用预解算子方法构造了这类变分包含解的迭代算法，并给出了由此迭代算法生成迭代序列的收敛性分析。     

Banach空间中变分不等式组的广义f-投影迭代算法

在Hilbert空间中,利用投影算法的收敛性来研究变分不等式组解的逼近已较广泛.但这个问题在Banach空间的研究却相对较少,主要原因是在Banach空间中投影映射缺少某些良好性质.运用广义f-投影算子,建议和分析了一类计算广义变分不等式组的近似解的迭代算法,在一致光滑和一致凸Banach空间中的一定条件下,建立解的存在性以及由算法生成的迭代序列的强收敛性定理.     

含H-单调算子的广义变分包含

在Hilbert空间中引入并研究了一类新的含H-单调算子的广义变分包含问题．利用方和黄关于H-单调算子的预解算子方法，得到了这类含H-单调算子的广义变分包含问题解的存在性和唯一性，发展了逼近唯一解的Mann迭代算法．     

序Banach空间中带⊕算子的广义混合序变分不等式组

在序Banach空间中,引入和研究了带算子的广义混合序变分不等式组.应用序Banach空间理论和矩阵分析方法,给出了其不等式组解的存在性定理,并基于序B-限制增生映象,给出了求解不等式组的迭代算法,迭代序列的收敛性和逼近解.     

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.     

Wuhan University Journal of Natural Sciences TOTAL CONTENTS

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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.     

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     

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.     

英文诗歌中的喻类修辞

为了有助于提高英文爱好者的个人情操、文化素养和学习兴趣,以及专业人员对英语学习和研究进行多途径的探索,本文通过一些精选诗歌的引证和分析,着重论述了喻类修辞法在英文诗歌中的运用其及效果。     

Man Is Unable to Change the Miserable Life——Analysis of the Arrangement of Four Characters in The Glass Menagerie

Tennessee Williams is considered as one of the most important American playwrights since World War II.The Glass Menagerie is his first successful drama,which describes a tragic situation of family and means to say that Man is unable to change the miserable life,no matter whatever means he try,This essay focuses on the analysis of the arrangement of the four main characters:Laura.Amanda,Jim and Tom to reveal the theme.Laura is fragile.Amanda is brave.Jim is vital.Tom is sensible.And all of them develop and try the different means to struggle against life,but fail tragically.With the evidence,the paper comes to conclusion naturally that Man is unable to change the miserable life,and he dooms to fail.     

Characterization of root-nodulating bacteria on Retama raetam in arid Tunisian soils

The aim of this study is to investigate the diversity of Retama raetam root-nodule bacteria isolated from arid regions of Tunisia. Twelve isolates, chosen as representative for different 16S rRNA gene patterns, were characterized by 16S rRNA gene sequencing and phenotypic analysis. Isolates were assigned to Sinorhizobium, Rhizobium and Agrobacterium. Symbiotic properties of Sinorhizobium and Rhizobium isolates showed a large diversity in their capacity to infect their host plant and fix atmospheric nitrogen. Strain RK 22 identified as Rhizobium was the most effective isolate.     

An Affordable Accurate Evaluation of the Binding Conformations Predicted by Molecular Docking Studies in Bio-System

正Recently,docking has been widely used to predict the binding-modes of protein-inhibitors,when the crystal complexes structure was absent.Most docking algorithms are able to generate a large number of probable conformations,it,however,is difficult to effectively evaluate these docking poses and identify the most reasonable bindingmode.In the present study,on the basis of the crystallographic data of human 3-hydroxy-3-methylglutaryl coenzyme     

WIMAX与WI-FI技术分析及联合组网

介绍了WiMAX与Wi-Fi两种无线宽带接入技术,并对两者之间的关系及相互之间的影响做了对比及分析,并对WiMAX的关键技术进行了详细说明,最后对两者的联合组网方式做了简单的探讨。