格路与组合恒等式

给出格路集Ｒ＿（ｎ×ｍ）的定义和其上的一种偏序关系；利用格路函数的性质计算出该偏序集的Ｍｂｉｕｓ函数，从而建立其上的Ｍｂｉｕｓ反演和一系列多元组合恒等式，使一些卷积公式成为其特例．     

偏序集上的M(o)bius函数的反演公式及其应用

本文把定义在自然数集Ｎ上的Ｍｏｂｉｕｓ函数推广到偏序集上,并推导出反演公式,然后利用反演公式导出集｛１,２,．．．ｎ｝的错位转换的个数,最后将Ｍｏｂｉｕｓ函数和反演公式推广到ｎ上局部有限偏离集上。     

拟阵的独立集构成的偏序集

为了将贪心算法与偏序集进行结合,以挖掘拟阵的更多算法,对拟阵的独立集族与偏序集之间的关系进行研究;利用拟阵的独立集全体关于集合的包含关系构建偏序集,利用布尔格的结构性质,讨论该偏序集的性质,得到有限偏序集在满足何种条件时,必为拟阵的结构的充要条件。结果表明:在同构意义下,有限偏序集与该偏序集所建立的拟阵之间的对应是满足一定条件的偏序集与无环拟阵之间的双射;建立了拟阵与偏序集之间的桥梁,可以将关于拟阵的一些研究成果转化为偏序集理论框架下的结论,反之亦然。     

有限格2~X的自同构群

证明了有限格 2 X 的自同构群 Aut2 X 与有限偏序集 X的自同构群是同构的这一结论     

有限格2^x的自同构群

证明了有限格2^x的自同构群Aut2^x与有限偏序集X的自同构群是同构的这一结论。     

有限分配格的自同态半群

设 P 是有限偏序集,L 是有限分配格.它们分别对应有限分配格P~*=Hom_(POS)(P,2) 及有限偏序集 L~*=Hom_(DL)(L(?)2) 。并且 L~*(序)反同构于 L的联既约元集,L~(**)(格)同构于 L.本文证明了对于有限配格 L,End_(DL)L 反同构于 End_(POS)L~*。进而得到 End_(DL)L 反同构于 End_(POS)P,其中 P 表 L 的联既约元集.作为推论,也可以获得有限 Boolc 代数情形的相应结论.     

图Kn—E（kPs∪rK3）的色唯一性

利用不可约路的概念，证明了当Ｐｓ是不可约的路时，Ｋｎ－Ｅ（ｋＰｓ∪ｒＫ３）是色唯一的图，其中设Ｋｎ－Ｅ（Ｇ）表示从完全图Ｋｎ中删去一个和Ｇ同构的子图的所有边而得到的图，ｓ≠４，且ｋｓ＋３ｒ＝ｎ，ｋ３是有３个顶点的完全图，同时给出了三类新的色等价图簇。     

有限偏序集的可拆性

就Ｆｉｘｅｄ Ｐｏｉｎｔ ｉｎ Ｐｏｓｅｔ中的定理“有限偏序集Ｐ是可拆的充要条件为Ｐ是不可约可拆”进行了改进,得到了Ｐ是同伦可拆的充要条件为Ｐ是星形不可约可拆,并且证明了这两个充要条件等价,极大地简化了不可约可拆的判别法     

强理想及其在有限偏序集上的应用

在偏序集上引入强集和强理想的概念,进而从另一个角度给出有限偏序集上元素之间的一种等价关系:连通关系,从而将有限偏序集分为连通和非连通两类.此外,在不交并偏序集上给出分支、可分分支和不可分分支等概念,并在有限偏序集上探讨强理想、非连通偏序集和不交并偏序集之间的关系.     

Mobius交错偏序集

本文研究了Ｍｏｂｉｕｓ交错偏序集，给出该类偏序集的纤维构造定理，并讨论其在积和区间运算下的保持情况．本文将Ｂａｃｌａｗｓｋｉ有关ＣＭ偏序集的一些性质推广到Ｍｏｂｉｕｓ交错偏序集上．     

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.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

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。     

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     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.