广义C0半群的性质与生成定理

引进广义C0半群及其C生成元的概念,得到广义C0半群的一些性质和生成定理.推广C0半群的结论,为直接用于讨论初值问题(d)/(dt)(Cx(t))=Ax(t)Cx(0)=Cy奠定了基础.     

一类广义抽象柯西问题的适定性

为研究广义抽象柯西问题ddtCx(t) =Ax(t)Cx(0 ) =Cy,引进广义C0 半群及其C生成元概念。利用广义C0 半群的一些性质证明了广义抽象柯西问题的适定性的充要条件     

广义C0半群的谱映射定理

传统的C0半群在诸如广义动态经济系统,电 网系统及时滞微分方程等形如d/dt(Cx(t)=Ax(t) Bu(t)其中C不可逆）中得不到直接应用,为此引入广义C0半群来研究初值问题{d/dt(Cx(t))=Ax(t),Cx(O)=Cy,为了讨论其解的稳定性（也即广义C0半群的稳定性）,引入广义C0半群的C生成元A的C谱,用Banach代数中的谱理论方法得到了广义C0半群在此广义谱下的谱映射定理。     

广义Co半群的性质与生成定理

引进广义Co半群及其C生成元的概念，得到广义Co半群的一些性质和生成定理，推广Co半群的结论，为直接用于讨论初值问题{d/dt(Cx(t))=Ax(t)Cx(o)=Cy奠定了基础。     

广义C0半群与耗散算子

利用了广义C0半群的定义、生成元的概念、性质、C0半群所具有的耗散算子的结论,主要得到了广义C0半群与生成元之间的关系,线性算子的耗散性刻画了广义C0半群以及压缩的广义C0生成元的充要条件,进而得到耗散的线性算子与广义C0半群的生成元之间的关系,耗散算子与共轭之间的关系,给出了耗散算子的一些性质。Banach空间中耗散算子是一类应用背景极强的算子,该工作对研究Banach空间下的无穷维动力系统的长期行为意义极大。将C0半群中的耗散算子的性质广泛推广到了广义C0半群,极大的丰富了广义C0半群的内容。     

(C0)类等度连续半群的无穷小生成元的特征

主要讨论在局部凸线性拓扑空间上的(C0)类等度连续半群{T(t):t≥0}诱导的C0-半群拓扑意义下,{T(t):t≥0}的一些基本性质,以及(C0)类等度连续半群{T(t):t≥0}在C0-半群拓扑意义下以及原拓扑意义下的无穷小生成元之间的关系.     

广义C0算子群

在Banach空间上研究单参数有界线性算子族--广义C0算子群,文中给出了广义C0半群及它的生成元定义,进而类似于C0算子群,给出了广义C0算子群的概念,并讨论了它与广义C0半群之间的关系.     

n阶α次积分C半群的逼近

借助算子半群逼近的相关理论及经典算子理论的研究方法,对算子A,An分别次生成的n阶α次积分C半群{T(t)}t≥0和{Tn(t)}t≥0,在一定条件下,当Tn(t)x逼近于T(t)x,则有Rc(λ,An)x逼近于Rc(λ,A)x,反之也成立.从而丰富了n阶α次积分C半群的研究内容.     

广义C-半群的生成元和性质

C-半群是有界线性算子强连续半群的一个有意义的推广,这一概念最早是由Davies与Pang引入的。后来,R.delaubenfels对其中生成元的定义作了改进。高文华为解决广义动态经济问题提出了广义C0-半群的定义,王宗毅对其进行了进一步研究,刘嫚提出了广义C-半群的定义。文章在此基础上给出了广义C-半群生成元及其弱生成元的定义,并且对其生成元的强弱性进行了研究,证明了其生成元的强弱等价性。另外,王宗毅在传统C0-半群的基础上,给出了广义C0-半群的定义,并且研究了它的一些性质,得到了一些有意义的结果,文章在此基础上进一步探讨了广义C-半群生成元的若干性质。     

可微C0-半群的谱

利用可微C0-半群的若干性质给出了可微C0-半群{T(t):t≥0}的生成元A的谱与AT(t)的谱之间的关系.     

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