一类带有时滞和时滞耦合复杂网络的脉冲同步

研究了耦合项和非线性项含有时滞的复杂网络的脉冲同步问题.根据可控的复杂网络达到同步时耦合项会自动消失,可以得到含有脉冲影响复杂网络的误差动态网络.根据脉冲微分方程的稳定性分析,建立合适的Lyapunov Krasovskii泛函,得到含有脉冲影响的复杂网络新的脉冲同步准则.最后,复杂网络的微分方程模型和误差系统仿真图说明了脉冲同步准则的有效性和正确性.     

一类耦合时延复杂动态网络的输出脉冲同步研究

针对含有耦合时延的一类输出耦合复杂动态网络,研究该类复杂动态网络的脉冲同步问题。基于输出控制思想和脉冲时滞控制方法,设计一种新的输出脉冲控制器,使该类复杂动态网络实现同步,并给出同步条件。以Lorenz混沌系统作为节点动态进行数值仿真,结果表明所设计的脉冲控制器能够有效实现复杂动态网络的同步。     

节点含时滞的输出耦合复杂网络的自适应脉冲同步

针对节点含时滞的输出耦合动态网络模型,基于Lyapunov稳定性理论和时滞脉冲微分方程理论,设计了复杂网络同步自适应脉冲控制器,给出网络同步的充分条件,保证动态网络渐近同步于任意指定的网络中单独节点的状态,进而实现该网络的同步.理论推导和数值结果均表明该同步方法的有效性及可行性.     

HR神经元网络抗脉冲干扰特性的研究

采用数值仿真的方法,研究了电突触耦合对Hindmarsh-Rose(HR)神经元网络抗脉冲干扰特性的影响.结果表明:规则的耦合形式和神经元数目对网络的抗脉冲干扰特性影响较小;神经元间电突触耦合强度的分布对网络的抗脉冲干扰特性影响较大.在全局耦合结构下,当突触耦合强的度分布满足一定条件时,网络中的神经元仍能同步放电且保持稳定的放电频率,呈现出较好的抵御脉冲干扰能力.     

脉冲耦合复值神经网络的全局渐近同步

本文研究多个复值神经网络在脉冲耦合机制下形成复杂网络系统的全局渐近同步问题.首先,基于序列连通和Dirac函数,引入网络节点仅在离散时刻进行信息交互的脉冲耦合策略.其次,通过直接误差方法及迭代思想建立脉冲耦合复值神经网络渐近同步的判别条件.最后,给出相关数值实例及仿真来验证理论结果的正确性和有效性.     

星状联结脉冲耦合网络的同步性

通过研究Mirollo与Strongatz提出的脉冲耦合振子模型,讨论了星状网络的同步性,并证明了除一个测度为0的集合外,网络将达到同步的结论.     

带耦合时滞的复杂网络通过时滞脉冲牵制控制达到同步

研究了带有耦合时滞的复杂网络通过时滞脉冲牵制控制达到同步的问题,其中时滞脉冲牵制控制被设计,基于李雅普诺夫函数法等,提出了保证复杂动力网络的指数同步的一些充分条件.本文的结果是基于先前结果的促进和改善.最后,通过数值模拟证明了结果的有效性.     

N星型连接电感问题的研究

本文提出对于N星型连接的电感电路之间存在耦合,可以找到去耦合的一般规律,而且对于去耦合N星型连接的电感电路可以用网形电感网络来等效转换,并给出等效变换的方法。     

一类节点结构相同的复杂网络脉冲同步

研究采用脉冲方法实现复杂网络的混沌同步问题,考察了脉冲信号作用下复杂网络的稳定性,推导出稳定性判定定理,以判断能否用脉冲信号实现复杂网络的脉冲同步.研究得到:脉冲信号作用下复杂网络稳定性判定定理,并通过4个节点的蔡电路网络的同步问题说明定理的有效性和方便实用性,数值模拟验证了理论结果的正确性.该研究成果对复杂网络的同步提供了一个可行的选择方案.     

扰动下混合时滞耦合动态网络的脉冲同步

针对一类具有混合时滞和多重扰动的耦合动态网络，提出了脉冲同步控制方法和新的同步性能指标。在传统的完全同步性指标无法实现的情况下，通过设计脉冲型反馈控制器，使得误差系统的状态最终收敛到有界范围内，克服了外部扰动对同步误差的影响；建立的改进型混合时滞差分不等式，避免了时滞效应对误差系统动力学分析造成的新困难；获得的同步性判据和控制器设计方法，不但改进了已有文献的相关结果，而且适用于兼具混合时滞和多重扰动的耦合网络模型，应用范围更广。     

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.