具非线性齐次项退化椭圆组的C1,α完全正则性

p≥2时,利用扰动法证明了一类具非线性齐次项退化椭圆组弱解的一阶微商在一定条件下,属于局部Morrey空间和Campanato空间,并在此基础上进一步加强条件限制得到了弱解一阶微商的内部Hlder连续性结果.     

能量不等式和抛物单调不等式成立的一个充分条件

讨论了含有底阶项铁磁链系统的Ｌａｎｄａｕ－Ｌｉｆｓｈｉｔｚ方程即非齐次调和映射流方程的Ｃａｕｃｈｙ问题．该问题弱解的能量不等式和抛物单调不等式在证明弱解的正则性时起关键作用．文中定义了该问题弱解满足的驻条件，给出了驻条件成立的充分条件，并且在驻条件下证明了弱解满足能量不等式和抛物单调不等式．     

非均匀粘性不可压缩流体动力学方程组的解的分数微商

本文讨论非均匀粘性不可压缩流体动力学方程组的正则性，运用Ｈａｒｄｙ－Ｌｉｔｔｌｅｗｏｏｄ极大数定理证明了其弱解有不高于１／２阶的分数微商。     

三维非齐次不可压缩Navier-Stokes-Vlasov方程组在移动区域上弱解的整体存在性

文中考虑了三维非齐次不可压缩Navier-Stokes-Vlasov方程组在移动区域上弱解的整体存在性,此结果是将文献[7]中齐次不可压缩情形推广到非齐次不可压缩情形。假设流体的初始密度有下界,基于Schaefer不动点定理和弱收敛方法证明了三维非齐次不可压缩Navier-Stokes-Vlasov方程组在移动区域上弱解的整体存在性。     

二阶散度型椭圆方程的梯度估计

探讨二阶线性散度型椭圆方程的内部梯度估计.在方程的系数函数和右端项函数都满足Dini连续条件下,证明了方程弱解的梯度也满足Dini连续.主要采用了方程弱解W~(1,2)的估计,局部L_∞估计及Caccioppoli不等式等先验估计,并进行迭代,得到方程解的梯度估计.进一步,当方程的系数函数及右端项函数均为Holder连续时,该结论也蕴含着解的梯度的Holder连续.     

一类非线性椭圆方程组弱解的处处正则性

二次增长的非线性椭圆方程弱解的正则性研究已经取得了比较完备的结果，但对于方程组弱解的正则性研究取得的成果还不多，有关文献证明了对角型椭圆方程组弱解在一定条件下是Holder连续的．本文考虎一类特殊类型的非线性椭圆方程组-DaAk^α(x，u，Du)=Bk(x，u，Du)，k=1，2，…，N x∈Ω包含R^n，在可控制增长条件下，证明其弱解是处处Hoelder连续的．这一结果把有关文献的结果向前推进了一步。     

对角形退缩椭圆型方程组弱解的局部正则性

本文得到对角形退缩椭圆型议程组弱解的某些积分估计,证明了弱解的局部Holder连续性,并把此结果推广至一类非对角形的情形.     

一阶线性偏微分方程组抽象齐次定解问题强解与弱解的一致性

本文引进了一阶线性偏微分算子组Cauchy空间的概念,提出了一阶线性偏微分算子组的抽象齐次定解问题,并给出了其强解与弱解的定义。以整体Lax-Phillips引理为工具,对Cauchy空间的拓扑结构给出了若干描述,籍此给出了一阶线性偏微分方程组抽象齐次定解问题强解与弱解一致的一个充要条件。作为应用,最后考察了局部代数一有限约束混合型定解问题强、弱解的一致性。     

波函数及其一阶微商的连续性

从薛定谔方程出发,依据数学原理对波函数及其一阶微商的连续条件作出严格的推证,得出波函数及其一阶微商连续的条件为:当势函数连续时,波函数及其一阶微商均连续;当势函数不连续时,若在其间断点的某一邻域内势函数有界,则波函数及其一阶微商连续.若在其间断点的某一邻域内势函数无界,则波函数及其一阶微商可能连续,也可能不连续.     

一类P-Laplace型椭圆方程组非常弱解的存在性

为了建立非齐次项是P-Laplace型算子的椭圆方程组非常弱解的存在性，构造适当的相对截断函数作为检验函数，并通过适当形式的权函数，结合相对覆盖分解和权重、散度-旋度定理等偏微分方程证明技巧，得到了具有P-Laplace型椭圆方程组非常弱解的存在性。     

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.     

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

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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。