基于阴影变换的动态灰值形态算子的研究

基于阴影变换和表面算子的理论,系统地研究了在空间变化(SV)即动态的二值形态学理论的基础上建立动态灰值形态算子的方法,证明了阴影集的相关结论,运用阴影变换和表面算子表示了SV灰值形态开、闭算子,并推导出腐蚀、膨胀以及开算子这3种算子所具有的代数表示形式,研究了腐蚀、膨胀、开、闭这4种算子的性质.     

R0-代数在一般集合上的⊕,→表示形式

在一般集合M上(放弃格的要求)以二元算子⊕,→为基本算子给出了R0-逻辑代数的一种纯代数表示形式(M,(⊕,→)), 进一步显示了R0-逻辑代数的一般代数特征及R0-代数与其他逻辑代数的联系.     

一类自反算子代数上的自伴线性映射

研究了完全分配交换格代数和ＶｏｎＮｅｕｍａｎｎ代数中套子代数上的自伴线性映射．得到一类完全分配交换格代数上的自件线性映射均为Ｔ→ＡＴ—ＴＢ形式，其中Ａ和Ｂ为自伴算子．证明了有限因子ＶｏｎＮｅｕｍａｎｎ代数中套子代数上的自伴线性映射也可表示为Ｔ→ＡＴ—ＴＢ，其中Ａ和Ｂ是套子代数的对角代数中的算子．     

R_0-代数在一般集合上的,→表示形式

在一般集合M上(放弃格的要求)以二元算子,→为基本算子给出了R0-逻辑代数的一种纯代数表示形式(M,(,→)),进一步显示了R0-逻辑代数的一般代数特征及R0-代数与其他逻辑代数的联系.     

格上BR0-代数结构的表示定理

利用模糊命题演绎系统BL＊中公理的基本特征,研究了BR0-代数结构,给出了BR0-代数结构在有界分配格上、有界格上及一般格上的不同形式的表示定理,同时指出了其相应的不同格上R-代数结构的表达形式。     

格上BR_0-代数结构的表示定理

利用模糊命题演绎系统BL*中公理的基本特征,研究了BR0-代数结构,给出了BR0-代数结构在有界分配格上、有界格上及一般格上的不同形式的表示定理,同时指出了其相应的不同格上R0-代数结构的表达形式。     

广义TKK代数的一类Boson表示

研究对应于欧式空间中非格半格S的Tits-Kantor-Koecher(TKK)李代数g(T(S))的泛中心扩张广义TKK代数g(T(S))的一类Boson场表示.首先将广义TKK代数g(T)的结构等式表示为一系列形式幂级数等式,然后利用关于量子环面上gln型李代数的顶点表示及由群代数与对称代数组成的Fock空间,构造一组作用于Fock空间的顶点算子.最后,证明这些顶点算子在这Fock空间上给出了广义TKK代数g(T)的一个Boson场顶点表示.     

TKK代数的一类表示

研究对应于欧氏空间中最小半格S的Tits—Kantor-Koecher李代数￡(￡(S))的泛中心扩张￡^-(￡(S))的表示．这里￡(S)为关于半格S的Jordan代数．首先将该李代数的结构等式表示为一系列形式幂级数等式．然后利用关于量子环面上gln型李代数的顶点表示及由群代数与对称代数组成的Fock空间．构造了一组作用于Fock空间的顶点算子．最后通过验证所定义的顶点算子满足该无穷维李代数的所有幂级数等式．证明了这些顶点算子在这一Fock空间上给出了TKK李代数￡^-(￡(S))的一个Boson场顶点表示．     

强双三角子空间格代数上Jordan同构的性质

目的研究非零复自反的Banach空间上的强双三角子空间格代数的性质。方法利用非零复自反的Banach空间上的强双三角子空间格代数中二秩算子和幂等算子的性质。结果证明了强双三角子空间格代数上的Jordan同构保持二秩算子。结论所给出的关于Jordan同构的性质对于进一步研究强双三角子空间格代数的性质、给出Jordan同构的刻画具有重要作用。     

有限维Hilbert空间的强自反子空间格代数模的性质

定义了空间格代数的(弱闭双边)模，对有限维Hilbert空间的强自反子空间格代数的模中的有限秩算子进行了讨论，得到有限秩算子一定可以表示为秩l算子的和．     

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