氢原子电多极动态极化率的解析表达式及其应用

在Tang和Chan所给出的氢原子的2-l极动态极化率的微分表达式的基础上,进一步导出了氢原子电多极动态极化率的解析表达式,从而完全解决了氢原子动态极化率的计算问题.应用此解析表达式,首次计算了氢原子H(2s)-H(2s)-H(2s)体系的三体相互作用系数.     

类锂体系1s22p2P态能量的相对论修正

利用不可约张量理论,导出了锂原子(含类锂离子)能量的相对论修正(包括相对论质量修正、达尔文修正、自旋-自旋接触相互作用和轨道-轨道相互作用)的解析表达式,在此基础上具体计算了类锂体系(Z=3→7)激发态1s22p 2P的总能量,所得计算结果与实验数据符合得较好.     

类铍体系基太以及低激发态能量的相对论修正

利用不可约张量理论,导出了铍原子(含类铍离子)能量的相对论修正(其中包括相对论质量修正、达尔文修正、自旋-自旋接触相互作用)的解析表达式,以此为基础,对于类铍体系(Z=4-8)基态(1s)22s2s1S以及低激发态(1s)22s2p3P分别完成角向、径向积分以及自旋求和,具体计算了这两个态的总能量,计算结果与实验数据符合得较好.     

在均匀强磁场中氢原子能级的计算

根据简并态微扰理论导出了在均匀强磁场中氢原子能级计算公式.该公式表明,只需给出量子数,可用简单的代数方法计算出相应的氢原子能级.本文应用该公式计算了在强磁场中(10≤B≤104T)氢原子n=4激发态的能级,并给出n=4的能级图.计算结果表明在强磁场中,氢原子的库仑场的对称性遭到破坏,n=4的能级简并几乎被全部解除.     

氟等电子序列1s22s2p6 2S态能量的计算

本文利用对角和方法,导出了氟等电子序列(Z=9-14)激发态1s22s2p6 2S非相对论能量的解析表达式,在考虑了电子间交换相互作用以及内外壳层电子的不同屏蔽效应的基础上,利用变分原理计算了非相对论能量值,计算结果与实验数据符合得较好,误差均小于1%.     

W~(40+)离子双电子复合速率系数的理论研究

利用基于全相对论组态相互作用理论的FAC程序包,详细研究了类硒W40+离子从基组态3s23p63d104s24p4俘获一个电子形成双激发态(3s23p63d104s24p4)-1 nln′l′(n=4~6,n′=4~100)的双电子复合(DR)过程.通过对不同壳层电子激发的DR速率系数的比较,得到了主要的电子激发DR通道,并且发现由4p电子激发的DR速率系数对总DR速率系数有重要贡献.在1~5×104 eV温度范围内,计算得到了n′=4~16的DR速率系数,并外推到n′=100,进而得到总DR速率系数.给出了Δn=0,1,2三类芯激发对总DR速率系数的贡献,发现对总DR速率系数的主要贡献来自于Δn=0,1的芯激发.对总DR速率系数和辐射复合(RR)以及三体复合(TBR)速率系数进行了比较,发现DR速率系数在研究的温度范围内远大于TBR和RR速率系数.为了方便应用,对总DR速率系数进行了参数拟合.     

硼原子激发态(4S)态能量的计算

以对角和不变法则为基础,导出了硼原子(含类硼离子)激发态(电子组态为(1s)2(2p)34)S态非相对论能量的解析表达式,并利用变分法计算出硼原子激发态4(S)态的非相对论能量值;在此基础上计算了类硼体系(Z=5～8)激发态4(S)态的能量,计算结果与实验数据符合的较好,误差小于0.6%。     

Au离子双电子复合速率系数的理论研究

利用全相对论组态相互作用理论方法,研究了Au33+离子由基态俘获一个电子形成双激发态(3d104s24p64d10)-1nln'l'(n=4~6,n'=4~15)的双电子复合(DR)过程。分析考虑了双激发态j=4d94f15p级联辐射退激到末态f=4d94fn'l'(n'=9,12.l'=0,2),可知DAC效应对DR速率系数有不可忽略的影响。研究分析了4d电子激发到不同壳层的DR速率系数以及在综合了分析得到对Au33+离子DR过程有明显贡献的各种因素后,进一步得到了总DR速率系数。     

类硼S离子高自旋态6Pe-6Po的辐射跃迁

利用Rayleigh-Ritz变分方法计算了类硼S离子内壳层激发高自旋六重态1s2s2p~2np~6 P~o(n=3-9),1s2s2p~2 n′s、1s2s2p~2 n′d ~6 P~e(n′=3-5)的电偶极辐射跃迁振子强度、辐射跃迁率、辐射跃迁波长,讨论了类硼S~(11+)离子1s2s2p~2 np ~6 P~o里德堡系列激发态的辐射跃迁规律.本文的计算结果将为相关实验光谱鉴定提供有价值的理论数据.     

中等强度磁场中氢原子能级的计算

借助角动量耦合理论在耦合表象中导出了中等磁场中氢原子哈密顿的对角元和非对角元的一般表达式,给出了考虑电子自旋与外磁场作用情形下氢原子在中等磁场中的能级结构的一般理论,具体计算了在中等磁场中氢原子n=5能级的结构.     

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

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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