具分布时滞的退化微分系统的全时滞稳定性

讨论了具有分布时滞的退化时滞微分系统的全时滞稳定性.首先给出退化系统渐进稳定时,其特征方程根的特性所具有的充分条件.然后给出具分布时滞的退化微分系统的特征方程,对其进行研究后,结合相关引理得到了系统全时滞稳定的充分必要条件.最后将结论推广到含有多个时滞的情形.     

具不确定时滞的非线性中立型系统的鲁棒稳定

研究了一类具不确定性及有界范数变时滞的非线性中立型微分系统的鲁棒稳定性问题，得到了依赖于时滞的全局渐近稳定性的充分判据。     

分数阶非线性变时滞脉冲微分系统的有限时间稳定性

论文研究了一类具有Caputo导数的分数阶非线性变时滞脉冲微分系统的有限时间稳定性问题,利用系统解的结构和广义的Gronwall不等式给出了具有时变时滞的分数阶非线性脉冲微分系统在有限时间区间上稳定的充分性条件,推广了现有结论,同时给出了具体的数值算例以验证定理条件的有效性。     

一类具有时滞的不确定系统的鲁棒稳定性

利用Alekseev公式和Bellman-Gronuwall不等式,讨论了一类具有时滞的不确定中立型微分系统的鲁棒稳定性问题,给出了不确定系统在具有时滞的反馈控制下是渐近稳定的充分条件。     

不确定时滞中立型系统的鲁棒稳定性

研究具有时滞的不确定中立型微分系统的鲁棒稳定性问题,利用Lyapunov泛函方法,结合代数Riccati方程,给出了不确定时滞中立型系统在不依赖时滞的反馈控制下是指数稳定的充分条件.     

具分布型时滞随机系统的时滞相关稳定性

研究了具有不确定性时滞的一类线性随机微分系统的依概率鲁棒全局渐近稳定性和均方意义下的指数稳定性，旨在研究更为广泛的一类线性随机滞后微分系统的稳定性，利用LMI方法，得到了分布时滞和离散时滞系统保守性较小的时滞相关的稳定性充分性判据。     

时变脉冲时滞微分系统的严格稳定性

考虑了时变脉冲时滞微分系统的严格稳定性,利用Lyapunov函数和比较原理,得到了时变脉冲时滞微分系统的严格一致稳定,严格一致渐近稳定和严格一致Lipsch汜稳定的充分条件。     

基于LMI方法的中立型多时滞系统稳定性分析

利用李雅普若夫第二方法结合LMI（线性矩阵不等式）方法讨论了中立型时滞微分系统的渐近稳定性，获得了该系统零解渐近稳定的充分条件，同时得到了易于判断系统渐近稳定的时滞无关与时滞相关的LMI不等式．通过实例比较表明文中结论推广并改进了现有文献中的结论．     

中立型时滞微分系统(A,B,D)-方法GZ-稳定性分析

将求解刚性常微分方程(ODEs)的(A，B，D)—方法推广到中立型时滞微分系统(NDDEs)．讨论变时滞情况下匹配一定插值方法非线性系统的GZ—4稳定性。     

一类变系数变时滞微分系统的一致渐近稳定性

文章讨论了一类变系数变时滞微分系统的一致渐近稳定性,利用拉兹密辛型条件及稳定性的有关理论,得到了该系统零解的一致渐近稳定性的简明判据.     

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).     

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.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.