D2分子X^1∑g^＋,B^1∑u^＋和C^1∏u态的势能函数

使用SAC／SAC—CI和D95＋＋＊＊、6—311＋＋g＊＊及cc—PVTZ基组,分别对D2分子的基态X^1∑6^＋、第二激发态B^1∑u^＋和第三简并激发态CI见的平衡结构和谐振频率进行优化计算．对所有计算结果进行比较,得出cc—PVTZ基组为最优基组．运用cc—PVTZ基组和SAC方法对基态X^1∑g^＋、SAC—CI方法对激发态B^1∑u^＋和C^1∏u进行单点能扫描计算,并用正规方程组拟合Murrell—Sorbie函数,得到相应电子态的势能函数解析式,由得到的势能函数计算了与X^1∑g^＋、B^1∑u^＋和C^1∏u态相对应的光谱常数,结果与实验数据较为一致．     

^7Li2分子A^1∑^＋u态的平衡几何、离解能及其谐振频率

利用分子反应静力学的原理，确定了^7Li2分子A^1∑^＋态的离解极限；利用SAC-CI方法、使用6-311G、6-311＋＋G、6-31IG（3df，3pa）、6-311＋＋G（3df，3pd）、D95（3df，3pd）、D95、D95V、D95V（d，p）、cc-PVTZ和AUG-cc-PVTZ等基组，对^7Li2分子A^1∑^＋u态的平衡几何进行了优化计算，且将计算结果与精细的单点能扫描结果进行了比较．分析表明。由单点能扫描获得的平衡核间距应更为合理．同时也得出了AUG-cc-PVTZ基组为最优基组的结论．在0．14—1．5nm范围内对该态进行了单点能扫描，并用最小二乘法拟合出了其解析势能函数．从得到的解析势能函数出发，计算了谊态的力常数（f2、f3和f4）及谐振频率（ωe），进而计算了其他光谱常数（Be，αe和ωeХe），理论值与实验结果一致．同时为便于分析和比较，对基态X^1∑^＋g也进行了相应的计算．     

BCl分子激发态A1Π、a3Π1的势能函数与垂直激发能

为了弄清BCl在金属蚀刻中的机理，了解BCl分子激发态势能函数和稳定性的基本信息是必要的。运用群论及原子分子反应静力学方法，推导出了BCl分子低激发态A^1∏、a^3∏1的电子态及相应的离解极限；使用SAC／SAC—CI方法，6—311＋＋g（d）^＊＊基组对BCl分子低激发态A^1∏、a^3∏1的平衡结构和谐振频率进行了几何优化计算，并对BCl分子低激发态A^1∏、a^3∏1进行了单点能扫描计算，用正规方程组拟合Murrell—Sorbie函数，得到相应电子态的势能函数解析式，利用得到的势能函数计算了相对应的力常数（f2、f3、f4）和光谱数据（Be、αe、ωe、ωe、χe、），数据值分别为：基态BCI（X^1∑^＋）的Re=0.1867nm，De=1．4855eV，Be=0．6228cm^-1，αe=0．0060cm^-1，ωe=810．2001cm^-1，ωeχe=4.981cm^-1；激发态BCI（a^3∏1）的Re=0.1726cm，De=6．1151eV，Be=0．6843cm^-1，αe=0．0039cm^-1，ωe=897．8493cm^-1，ωeχe=5．2800cm^-1；激发态BCI（A^1∏）的Re=0．1722nm，De=7．1515eV，Be=0.6799cm^-1，αe=0．0085cm^-1，ωe=784.5359cm^-1，ωeχe=12.88cm^-1．结果与文献数据相符合；在基态的平衡位置处，计算了从基态到A^1∏、a^3∏1态的垂直激发能，其值分别为7．6291eV，10．1023eV．     

C（^3Pg）＋SiO（X^1∑^＋）体系的反应碰撞轨迹

使用经典轨迹法研究了反应C（^3Pg）＋SiO（X^1∑^＋，V=0，J=0）碰撞轨迹．碳化硅合成反应C（^3Pg）＋SiO（X^1∑^1，V=0，1；J=0）→SiC（X^1∑^1）＋O（^3Pg）存在阈能，反应截面存在一个极大值和最佳反应能量．在SiC最佳产率区，通过反应物的振动激发并不能使SiC产率明显提高，基态下SiC合成反应的最佳能区为该反应的最佳产率区．     

Bell分子A^2∏1/2∏3/2电子态的势能函数

采用多组态简并微扰理论计算了自旋轨道耦舍下的BeH分子第一激发态A^2∏的分裂,得到了这些分裂态的Murrell-Sorbie势能函数,在此基础上推导出了电子态^2∏1/2和^2∏3/2的光谱常数.^2∏1/2和^2∏3/2的垂直激发能为78．422cm^-1,对于电子态^2∏1/2和^2∏3/2的光谱数据在我们的计算中首次给出．     

H2分子X^1Σg^＋，B^1Σu^＋和C^1Πu态的势能函数

使用SAC／SAC—CI方法，利用D95＋＋^＊＊、6—311＋＋g^＊＊以及cc—PVTZ等基组，对H2分子的基态X^1Σg^＋、第二激发态B^1Σu^＋及第三简并激发态C^1Πu的平衡结构和谐振频率进行了优化计算。通过对三个基组的计算结果的比较，得出了cc—PVTZ基组为三个基组中的最优基组的结论；使用cc—PVTZ基组，利用SAC的GSUM（Group Sum of Operators）方法对基态X^1Σg^＋、SAC—CI的GSUM方法对激发态B^1Σu^＋和C^1Πu进行单点能扫描计算，用正规方程组拟合Murrell—Sorbie函数，得到了相应电子态的完整势能函数；从得到的势能函数计算了与基态X^1Σg^＋、第二激发态B^1Σu^＋和第三简并激发态C^1Πu相对应的光谱常数（Be，αe，ωe和ωeχe），结果与实验数据基本一致。     

BeO分子基态（X^1∑^＋）的结构与势能函数的理论研究

采用量子力学abinitio从头算,运用Gaussian03软件包中的三种方法结合不同基组优化计算了BeO分子基态（X^1∑^＋）的结构,选用二次组态相互作用QCISD（T）方法结合、6-311＋＋G＊＊（3af,3N）基组对BeO分子基态（X^1∑^＋）进行了单点能扫描计算;用Murrell-Sorbie函数表示分子解析势能函数,得出了相关系数和力常数,并计算出了BeO分子的光谱数据（ωe、ωeXe、Be、αe、De）,结果与实验光谱数据吻合较好。     

SiO分子的基态（X^1∑^＋）势能函数的研究

运用Gaussian03程序，使用从头算方法计算了SiO分子基态（X^1∑^＋）的平衡结构和离解能，利用单点能计算的结果，采用正规方程组拟合Murrell—Sorbie函数，得出SiO分子的基态分析势能函数，并且计算出SiO分子的光谱常数ωe、ωeχe、Be和αe的值，计算结果与实验值符合得较好．     

7LiH分子的基态X1Σ+和激发态A1Σ+、B1Π与b3Π的平衡几何与垂直激发能

使用分子反应静力学的有关原理,推导出了7L iH分子的基态X1Σ 、单重态的第一激发态A1Σ 、第二激发态B1Π以及三重态的第二激发态b3Π的合理离解极限.利用“对称性匹配蔟-组态相互作用”方法,在完全活性空间中计算了这一分子相应于上述各态的平衡核间距.其中,X1Σ 态为0.160 9 nm;A1Σ 和B1Π态分别为0.248 7和0.243 4 nm;b3Π态为0.195 8 nm.在基态的平衡位置处,计算了从基态到A1Σ 、B1Π及b3Π态的垂直激发能,其值分别为3.613、4.612和4.233 eV.将本文获得的计算结果与其它理论方法获得的计算结果及实验结果进行了比较,计算结果与实验结果吻合得很好;同时,本文获得的平衡核间距和垂直激发能与使用很复杂的方法获得的计算结果也相当接近.     

HCl分子基态（X^1 ∑^＋）的平衡几何与势能函数

采用密度泛函理论的B3LYP方法和二次组态相互作用的QCISD和QCISD（T）等理论方法，在D95（d），6—311G（d，P）和6—311G（3df，3pd）基组下，对HCl分子基态的平衡结构、离解能和谐振频率进行了优化计算，利用QCISD／d95（d）对HCl分子的基态进行了单点能量扫描，并将扫描结果用正规方程组拟合Murrell—Sorbie势能函数．由拟舍得到的势能函数，计算与X^1 ∑^＋态相应的光谱常数（Be、αe ωe和ωeXe），其结果与实验符合得较好．     

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.     

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.     

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