利用线性抽样方法求解反介质散射问题

线性抽样方法在考虑一个第一类线性积分方程中的参数z从区域内部趋近散射区域边界δD时，该方程的解趋近于无穷大。在此基础上对z∈R^2＼D的情形就反介质散射问题，利用积分方程理论严格证明了该方程的解的收敛性。     

Fisher方程的级数解

本文首先给出了Ｆｉｓｈｅｒ方程的定性分析，讨论三种形式解，并得到了一类解析解，然后把整个解分布三个区域的级数解，利用对接条件构成一个整体级数解。     

奇异热流密度场的数值分析(Ⅰ)——热传导特征解问题

为得到用于分析奇异热流密度场的高效的有限元列式，针对不同材料中界面裂纹尖端的扇形区域，推导出二维热传导特征解问题的基本方程和边界条件的弱形式．利用特征方程展开方法，可获得分析裂纹尖端处二维热传导特征解的一维有限元列式．该列式只需对扇形区域在角度方向上离散，最后得到一个二次特征根矩阵的总体方程．求解该方程可得到二维热传导问题的特征解．数值计算表明，该方法可高效准确地求解奇异热流密度场特征解．     

一类具有扩散的捕食与被捕食动力系统的研究

对一类描述具有扩散的捕食与被捕食生态系统的偏微分方程组进行了研究。该系统考虑了种群对于时间及空间的依赖性，当不考虑空间影响时，方程简化为一类具有功能性反应的Lotka-Volterra模型，应用反应－扩散方程的单调方法和不变区域理论，证明了解是一致有界的，且所有解最终进入相空间中的一个固定区域，也讨论了对应于一个或两个种群灭绝的常数平衡解的稳定性。     

方程(/(x))△u=h(x,y)的ВИШИК問題

本文给出題目所列方程的一个“Dirichlet-Cauchy問題”(問題)的解的存在、唯一性証明,作出一个經典解定理与两个广义解定理,並给出区域为园域及一般区域时解的各种表达式.     

一个非局部的反应扩散方程

考虑一个带参数的非局部反应扩散方程，证明了小初值时非负解整体存在，大初值时，存在一个临界值ε＾＊，使得当０〈ε〈ε＾＊时方程的非负解体存在；当ε〉ε＾＊时方程的非负解在有限时刻爆破，而且爆破集是整个区域Ω＾－。     

带有非局部边界条件的反应——扩散方程解的爆破与整体存在

考虑在有界区域中非局部边界条件下的一个反应-扩散方程,在一定条件下,该方程的解整体存在或有限时刻爆破.通过构造方程的上、下解,由比较原理,得到定理的证明.     

一类周期性热传导方程的边界元数值解法

引入周期性热传导方程混合边值问题的基本解矩阵，得到边界积分方程和边界变分方程。利用Soblev空间的性质，给出边界元近似解的误差估计。本文结果消除了常规边界元计算中边界积分方程的区域积分项。     

二元混合型偏微分方程的Frankl问题和Tricomi问题

研究一个二元混合型偏微分方程的Frankl问题解的存在惟一性,并讨论此方程的Frankl问题的解如何趋向于其对应的Tricomi问题的解.此混合型方程的系数在双曲型区域与椭圆型区域的连接线上是间断的.主要结果是:此方程的Frankl问题在H1中存在惟一的解;当Frankl问题的边界条件给法趋向于Tricomi问题的边界条件给法时,该方程的Frankl问题的解也在H1中趋近于其对应的Tricomi问题的解.     

三阶拟线性抛物-双曲型方程的定解问题

对三阶拟线性抛物-双曲型方程提出两个定解问题,并且证明了这两个定解问题解的存在唯一性。在证明过程中,首先把原来的定解问题用特征坐标表示出来,并用特征坐标把问题化为与之等价的微分-积分方程;其次,用这个微分-积分方程定义一个算子,并且证明了这个算子在一个小区域上存在唯一的不动点即解;最后,把这个解延拓到原来的求解区域。     

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…     

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).     

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.     

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.