最终范数连续半群的一些性质

主要讨论了Banach空间中当t＞t0（t0≥0）时，最终范数连续半群{T（t）│t≥0}的性质，给出了最终范数连续半群无穷小生成元的一个谱分布性质．主要定理如下：设{T（t）lt≥0}是Banach空间X上的C0半群，A是其无穷小生成元，ω0=inft＞0（1/t1n‖T（t）‖）．若T（t）关于t＞α≥0是最终范数连续的，则存在一个减函数φ：（0，∞）→R，满足φ（M）→-∞（M→∞）且S={λ∈C│Reλ≥φ（│Imλ│） }lReA≥P（1ImAl）}包括于ρ（A），其中ρ（A）为A的预解集．     

关于非扩张半群的弱收敛定理

设X是满足Opial条件的巴拿赫空间,C是X的一个弱紧致子集,S是C上的一个非扩张半群,本文证明了如果X∈C,并且对于一切h≥0,limt≤→∞‖T(t h)x-T(t)x‖＝0,则T(t)x弱收敛于某个γ∈F（S）（S的不动点集全体）。     

树图的全控制数

设G为n阶连通图，集合S称为图G的全控制集，如果V（G）的每个顶点都和S中某点相邻。图G的全控制数，记为γt（G），是图G的全控制集的最小基数。证明了对阶数n≥3且T≠K1，n-1的树T，γt（T）=min{（2n/3），n-l，[n/2]＋l-1}，这里l表示树T中叶子的数目。     

有界算子扰动C0-半群增长阶的判定

文章研究Hilbert空间中具有增长ω0的C0-半群（T（t））t≥0，在有界算子B扰动后所成半群（S（t））t≥0的增长阶ω1大于或小于给定常数ω的充分条件。     

广义复合泊松风险模型的大偏差与破产时刻

进一步研究广义复合泊松风险模型的大偏差问题,其中{N（t）;t≥0}是一强度为λ〉0的泊松分布,{Xn;n≥1}是独立同分布的随机变量序列,具有共同分布F,（其中0〈μ=EX1〈∞．）{M（t）;t≥0}是一强δ〉0的泊松分布,{N（t）;t≥0},{Xn;n≥1}和{M（t）;t≥0}是相互独立的．理赔剩余过程S（t）∑i=1^N（t）Xi-cM（t）,t≥0．在F∈C上得到了一系列大偏差和破产时刻的结果,这些结果可以应用在某些金融与保险问题中．     

随机和局部精细大偏差的应用

研究了在F∈SΔ,Δ=(0,T],T≤∞的条件下随机和S(T)=SUM from i=1 to N(t) ξi,t≥0中心化的局部精细大偏差结果中{h(t),t≥0}和{J(t),t≥0}的选取,并且给出了随机和的局部精细大偏差在索赔过程和再保险中的应用.     

指数有界双连续n阶α次积分C半群的逼近

利用经典算子半群理论中的研究方法，基于双连续n阶α次积分C半群的生成定理，讨论了指数有界双连续n阶α次积分C半群的逼近定理。{T(t)}_t≥0，{Tn(t)}_t≥0分别是由A、A_n次生成的指数有界双连续n阶α次积分C半群，在一定条件下，可以得到Ra(λ，A_n) x→Ra(λ，A) x与T_n(t)x→T (t)x等价。研究结果推广了n阶α次积分C半群相关的逼近定理。     

一些特殊第二类Stirling数的p-adic赋值

设k和n为非负整数.第二类Stirling数表示将n个元素划分为恰好k个非空集合的个数,记为S（n,k）.对任意给定的素数p和正整数n,存在惟一的整数a和m≥0使得n=ap^m,其中（a,p）=1（a与p互素）.称m为n的p-adic赋值,并记v_p（n）=m.第二类Stirling数的p-adic赋值是数论和代数拓扑领域的重要问题.本文研究了一些特殊第二类Stirling数S（pⁿ,2^tp）的p-adic赋值,其中p为奇素数,t和n为正整数.本文证明当n≥2,2≤2^tp(S（pⁿ,2^tp）)≥n+2-2^t,推广了Zhao和Qiu最近的结果.     

上下解方法求解奇异动力系统

本文用上下解方法求解奇异位势的Hamilton系统，主要结果如下：定理设有界，设满足：设h（t）＝（h1（t），h2（t），…，hn（t）∈C0（S1，Rn）满足（i＝1，2，…，n），其中S1＝[0，T]/{0，T}，则动力系统至少有一个C2的T—周期解．     

Banach空间中渐近非扩展半群的强收敛性

研究了Banach空间中关于非扩展半群S＝{S(t):t≥0}且F(S)非空的序列的强收敛定理,主要证明了由下式定义的迭代{xn}:xn＝anx (1-an)1/tn∫tn0S(s)xnds,n＝0,1,2,…的强收敛性.     

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.     

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.     

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.     

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.     

A computer generator for randomly layered structures

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

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.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-