一类不确定组合广义大系统的稳定性

一类不确定组合广义大系统所含有的不确定性是时不变未知但范数有界的,对所有容许的不确定性,寻找通过子系统特征,使得该不确定组合广义大系统都是正则的、脉冲自由且稳定的条件。应用线性矩阵不等式方法,给出了完全用子系统特征描述的该类不确定组合广义大系统稳定性的充分条件;作为主要结果的特例,给出了不合不确定项的组合广义大系统的用子系统特征描述的稳定性条件。最后用数值例子说明该方法的应用。     

时滞大系统的模型集结及其无条件稳定性(1)

本文用分解——集结法结合比较原理,对于有时滞的非线性定常大系统,建立了低维线性集结模型。由低维集结模型的稳定性一次完成对原来高维非线性大系统的稳定性判定,省去了对各子系统稳定性的判定条件。同时给出了稳定性的参数形式的充分条件。所得结果与时滞大小无关。     

具有时变时滞线性大系统的鲁棒稳定新判据

应用Lyapunov稳定性理论,导出了一类具有时变时滞线性大系统时滞无关稳定性条件.应用所得的研究结果提供了一种测试时变时滞大系统稳定性的简便而有效的方法.示例的结果与相关理论结果比较妥合,从而论证所得研究方法法的有效性.参11.     

时变大系统的零解的稳定性

本文利用参数变易法研究时变大系统的零解的稳定性问题,获得了简洁的结果,且运算很简单,避免了通常研究大系统时的繁杂运算.     

用平衡结构法讨论大系统实用稳定性和极限环存在性

首先简介由本文作者提出的研究大系统稳定性的平衡结构法。其次应用平衡结构法讨论大系统的实用稳定性,并研究了一般二维非线性动态系统的极限环存在问题。最后给出一个实例说明所得结果的应用。     

灰色离散大系统零解的稳定性

利用一般离散大系统零解稳定性的Ｌｙａｐｕｎｏｖ分解结论,结合区间矩阵的概念,讨论了线性灰色离散大系统和具有非线性扰动项的灰色离散大系统的稳定性问题,得到了若干稳定性的充分判据。这项成果将文献〖２～４〗的主要结果由普通灰色离散系统推广到大型灰色离散系统,并给出应用实例。     

关于一类变系数系统解的稳定性

本文利用大系统理论研究了一类变系数系统解的稳定性,并且讨论了飞机纵向运动方程,得到了比文[1]更好的结果。     

具有参数扰动的时滞大系统鲁棒稳定性的充分条件

本文提出了具有参数扰动的时滞大系统鲁棒稳定性的充分条件，该条件改进了Ｋ．Ｍｉｚｕｋａｍｉ，Ｓ．Ｙ．Ｚｈａｎｇ，及Ｈ．Ｓ．Ｗｕ等人近期的相应结果     

探讨大温差技术在空调系统中的应用分析

本文对空调大温差这一空调领域的新技术,从送风大温差、冷冻水大温差系统及与变流量、冰蓄冷相结合的冷水大温差和低温送风系统进行了分析。与常规系统比较,大温差技术能减少系统的运行费用,节约能源尤其是高品位的电能,能减少系统的一次投资。     

无穷时滞非线性大系统的时滞无关稳定性

本文讨论一类具有无穷时滞的非线性大系统的全局渐近稳定性,改进了文献[2]的结果.     

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)

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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