利用相对论性自治Birkhoff系统的第一积分求非等时变分方程的特解

给出相对论性自治 Birkhoff系统的非等时变分方程 ,研究它们的解 ,并利用第一积分来得到变分方程的特解 ,最后举例说明其应用。     

约束自治广义Birkhoff系统平衡稳定性的梯度系统方法

建立约束自治广义Birkhoff系统的微分方程.给出约束自治广义Birkhoff系统转化为梯度系统的条件.利用梯度系统的特性来研究约束自治广义Birkhoff系统的稳定性.最后举例说明结果的应用.     

非齐次Hamilton系统的Birkhoff表示

本文首先讨论了Hamilton系统与Birkhoff系统的关系,以及Birkhoff系统研究的理论意义和实际价值．进一步研究了非齐次Hamilton系统的Birkhoff化理论、Birkhoff方程的实现条件、构造方法,指出了Birkhoff动力学研究的主要困难和未来应该重点关注的基本问题;最后给出了广义Birkhoff系统动力学方程的形式以及研究广义Birkhoff方程的重要意义,并探讨了赝广义Birkhoff方程的形式以及构造动力学系统赝广义Birkhoff方程的目的和意义．     

高维自治Birkhoff系统奇点类型及其稳定性

研究了高维自治Birkhoff系统的奇点类型及其稳定性,首先由奇点方程得到系统的奇点及其性质,然后研究了奇点处Fréchet导数的特征根性质,从而判断出高维自治Birkhoff系统的奇点不存在汇和源,只存在双曲奇点.并给出判断奇点稳定性的相关定理.     

相对论性自治Birkhoff系统的第一积分与其变分方程特解的联系

给出相对论自治Birkhoff系统的变分方程,研究它们的解,并利用第一积分得到变分方程的特解.     

二阶广义自治Birkhoff系统的全局稳定性

利用Liapunov函数法和Кpacoвcκий方法研究二阶广义自治Birkhoff系统的全局渐近稳定性.首先给出该系统Liapunov函数V的形式,然后证明了Liapunov函数对时间的导数V与矩阵F(a)的关系,进一步给出了判断该系统全局渐近稳定性的命题,最后举例说明结果的应用.     

非自治广义Birkhoff系统的Poisson理论

研究了非自治广义Birkhoff方程的代数结构,证明非自治广义Birkhoff方程具有相容代数结构和Lie容许代数结构;建立了非自治广义Birkhoff系统的Poisson理论,包括建立系统的Poisson条件,证明了在一定条件下可由已知第一积分得到新的第一积分;讨论了与非自治广义Birkhoff系统的Poisson方法相关的动力学逆问题.结果具有普遍性,非自治Birkhoff系统的情况是该结果的特殊情况.文末举例说明了结果的应用.     

Birkhoff系统的Mei对称性与动力学逆问题

研究Birkhoff系统Mei对称性的动力学逆问题的提法和解法.首先列出Birkhoff系统的Mei对称性的确定方程、结构方程以及Mei对称性导致的Mei守恒量.其次,给出Birkhoff系统Mei对称性逆问题的两种提法和相应的解法,并举例说明结果的应用.     

线性动力系统可化为线性自治Birkhoff动力系统的条件

研究一般线性动力系统何时转化为线性自治Birkhoff动力系统的问题，给出线性自治Birkhoff动力系统与线性自治Hamilton动力系统等价性的定理，并推导出2n维线性动力系统转化为线性自治Birkhoff动力系统条件，通过运用若当形对转化条件进行分析，分情况给出Bikhoff张量非退化的条件。     

相对论性约束力学系统的Birkhoff表示

给出相对论性Ｐｆａｆｆ－Ｂｉｒｋｈｏｆｆ原理和相对论性Ｂｉｒｋｈｏｆｆ方程,证明：相对论性完整保守力学系统可以直接纳入Ｂｉｒｋｈｏｆｆ系统动力学,一般相对论性完整力学系统,先将运动方程表成显形式,然后实行Ｂｉｒｋｈｏｆｆ化。并给出应用实例。     

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-