时滞混沌神经网络的指数同步

本文研究了带有时滞混沌神经网络的指数同步问题,通过利用非线性回归控制和有效地控制定律,根据所给定的条件构造相应的线性矩阵不等式,得到了时滞神经网络的指数同步。这个方法比之前的线性控制方法更有效,数值结果进一步证明了该方法的有效性。     

基于采样控制的时滞神经网络的指数同步

基于采样控制研究了时滞神经网络的指数同步问题。首先,建立了驱动-响应时滞神经网络的数学模型并设计了采样控制器。其次,在输入延迟法的框架下,通过构造时间依赖的李雅普诺夫泛函,并结合自由权矩阵方法,建立了保证驱动-响应系统取得指数同步的线性矩阵不等式形式(LMIs)的判据。最后,通过两个数值仿真算例验证了结果的可行性。     

具时滞离散型神经网络指数同步问题

给出了具有时变时滞的离散型神经网络全局指数同步的定义,并对一类具有时变时滞的离散型时滞神经网络的全局指数同步问题作了详细的研究,得出了一类离散型神经网络全局指数同步的充分性判据,可通过LMI工具箱检验判据有效性。     

时滞细胞神经网络全局同步的滑模控制方法

利用改进的滑模控制方法,研究了具有多时滞和分布时滞细胞神经网络的全局同步问题.基于Lyapunov稳定性原理,运用线性矩阵不等式方法,设计滑模面,考虑了时滞独立和时滞相关两种情况.设计了合适的滑模控制器,以使得误差系统的轨迹能全局达到滑模面.得到了相对充分的条件,来确保时滞独立与时滞相关两种情况下误差系统的全局稳定性,从而实现时滞细胞神经网络的全局同步.结果表明所设计的滑模控制器由误差反馈控制输出来获得高增益补偿的准则,可用以处理神经网络的全局同步问题,并且此方法可应用于其他复杂神经网络.     

具有脉冲效应和Leakage项时滞的随机扰动模糊细胞神经网络的指数同步

研究了具有脉冲效应和Leakage项时滞的随机扰动模糊细胞神经网络的指数同步,通过李雅普诺夫稳定性理论、随机微分方程理论、随机分析法、It?'s公式及一些不等式方法,基于p-范数下得到了新的指数同步的充分条件.在本文中所考虑的脉冲效应是一般函数,而不是线性函数;还发现随机扰动和Leakage项时滞对系统同步有抑制作用.     

一类离散神经网络的全局指数同步探析

定义了离散型神经网络全局指数同步的概念,研究了一类离散型时滞神经网络的全局指数同步问题,给出了这类神经网络全局指数同步的充分性判据,判据的有效性可通过LMI工具箱得到检验.     

分布时滞区间神经网络的脉冲同步控制

利用脉冲控制方法研究了具有分布时滞的区间神经网络的全局指数同步问题,充分考虑了分布时滞和不确定的区间参数对系统的影响.设计了一个新的脉冲控制器来保证区间神经网络的全局指数同步,整个系统的同步在很大程度上依赖于本文所设计的脉冲控制器.通过构造Lyapunov函数,利用脉冲微分不等式技术及其它数学方法,给出了驱动系统和响应系统实现全局指数同步的充分判据.所得判据均由LMI形式给出,易于通过Matlab中的工具箱进行验证.最后,通过数值算例和仿真结果验证了相关结论的可行性和有效性.     

一类随机离散神经网络全局渐近同步

研究离散型时滞随机神经网络的同步问题,考虑了参数不确定性,解决离散型分布时滞对神经网络同步问题的影响.基于主从同步的概念,设计一个有更广泛应用的控制器,应用Lyapunov稳定性理论和线性矩阵不等式工具箱,得到这类神经网络同步的充分性判据.最后给出实际例子,检验了判据的有效性.     

基于反馈控制的分数阶时滞神经网络的同步

研究了分数阶时滞神经网络的同步问题,通过使用Mittag-Leffler函数和线性反馈控制,给出了同步控制器解析式,得到了关于Caputo导数的时滞神经网络同步的充分条件;系统同步的条件容易证明和实现且仅依赖于系统的结构;最后通过数值模拟验证了理论的有效性.     

时标上具有离散时滞的Wilson-Cowan网络同步

在时标上微积分理论的基础上研究了具有离散时滞的Wilson-Cowan网络的全局指数型同步。通过构造Lyapunov函数,运用线性矩阵不等式和Kronecker积运算等方法,得到了时标上具有离散时滞的Wilson-Cowan网络全局指数型同步的充分条件,即当系统满足定理1中的线性矩阵不等式时可达到全局指数型同步。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

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.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

A computer generator for randomly layered structures

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

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

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。     

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.     

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

正~~     

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