平行曲率子流形的无穷小变分

在引文〔1〕、〔2〕中给出了子流形的无穷小变分。本文是在引文〔5〕的基础上研究了平行曲率子流形的无穷小变分,得到了某些结果。     

Fuzzy映射族的公共不动点定理

Heilpern〔1〕首先把Banach压缩映射不动点定理推广到Fuzzy映射的情形。Euzzy映射不动点定理的进一步讨论可见Butnariu〔2〕,张石生〔3〕—〔5〕,王戈平〔6〕等等。最近,方锦暄〔7〕引入了Fuzzy映射不动度的概念,将文献〔1〕〔3〕〔4〕中的某些结果进行了推广。本文对不动度概念做某些讨论,并且给出Fuzzy映射族的一个新的公共不动点定理。     

以营养动力学为基础 捕食模型的定性分析

文献〔1〕给出了捕食模型 文献〔2〕对(1)进行了讨论并给出某些结果,本文在〔2〕的基础上对(1)的全局稳定性进行了讨论。     

函数空间L〔0,∞)中的概率测度序列的紧性

在(1)中,P.Billingsley给出了C〔0,1〕和D〔0,1〕中的概率测度序列的紧性准则。W.Whitt(2)将C〔0,1〕的某些结果推广到了C〔0,∞),得到了相应结论。这里考虑L〔0,∞)中的概率测度序列的紧性条件,以及子空间M〔0,∞)中概率测度的弱收敛。     

柯召定理的一个证明

柯召教授在文献〔1〕、〔2〕中证明了著名的“柯召定理”:设P>3是素数,则方程x~2-1=y~p没有正整数解x,y。后来,Chein、Rotkiewicz分别给出了一个简化证明。本文作者还给出了一个推广。但这些工作都是基于文〔1〕的一个结果。本文避开了〔1〕的结果,给出了柯召定理的一个简短的初等证明。     

某些二阶非线性系统全局稳定性的充分,必要条件

本文研究某些二阶非线性系统全局稳定性的充分、必要条件。本文的主要结果推广和改进了参考文献〔1〕、〔2〕、〔3〕的主要定理。     

序数算术

本文应用〔1〕和〔3〕里的某些定理,研究序数的加法,乘法和方幂,获得多项完善的结果。文中所有的记号和术语,凡在〔1〕或〔3〕里出现过的都不再作说明,所有的希腊字母都表示序数。 1.序数的进位表示     

拟相似性与谱

本文推广了文献〔2〕之定理Ⅱ.4.4和文献〔3〕之定理4.4,证明了在较弱条件下拟相似性保持谱不变。特别作为简单推论,得到了S.Clary的结果,最后,我们证明了在一定条件下,拟相似性保持弱可分解性。     

局部凸空间中非线性压缩半群的收敛性

<正> Trotter〔1〕曾研究了线性算子半群数列的收敛问题。后来T.kato把Trotter的一个定理扩充到局部凸的拓扑线性空间(见〔2〕,P.269),另一些作者对局部凸空间中线性算子半群叙列的收敛问题也有过研究(参看〔3〕,〔4〕),Brezis-pazy〔6〕研究了Hilbert空间中非线性压缩半群叙列的收敛问题(见〔6〕,定理3.3及推论3.1),其处理方法仅限于使用在Hilbert空间的场合,本文考虑了局部凸空间中非线性压缩半群叙列的收敛问题,文中的主要结果是§2中的定理1、2、3。定理1把Trotter-Kato定理(见〔2〕,P.269)扩充到非线性的情形,同时也把〔6〕、〔7〕和〔9〕中的某些结果扩充到局部凸的拓扑线性空间;而定理2和定理3则是把Trotter的另一定理(见〔1〕,定理5.2)扩充到局部凸空间非线性的情形。     

C'iriC'型映射的不动点定理

设T是一距离空间(X,d)的自映射,对某α∈(0,1)和对一切x,y∈X 成立(1)min{d(Tx,Ty),d(x,Tx),d(y,Ty)}—min{d(x,Ty),d(y,Tx)}≤αd(x,y).C'iriC'首先在适当假设下对上述映射证明了某些不动点定理.Ise'ki 和Kasahara 已将〔1〕的结果推广到L(?)空间.最近Achari 将〔1〕的结果推广到了多值映射和Lal;Das 将〔1〕的结果改进并推广到了2(?)距离空间.本文目的是分别在L(?)空间和2(?)距离空间内将上述已知结果进一步改进并推广到交换型     

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-