具连续变量中立型差分方程的线性振动性

利用积分法研究了二阶具连续变量中立型非线性差分方程的线性振动性,即建立了此非线性差分方程和其相应的线性极限方程振动性间的联系.通过判定一个较简单的线性差分方程的振动性,就可以得到其相应非线性差分方程,甚至是一类非线性差分方程的振动性.     

含有极大值的二阶差分方程的有界振动性和非振动性

研究了带有极大值的二阶差分方程,讨论了有界解的振动性和非振动性,在已有的含有极大值的一阶差分方程有关文献的基础上对一些结论进行了扩展,主要运用了不等式的放缩法得出了含有极大值的二阶差分方程的振动性和非振动性.     

时间测度链上一类二阶非线性动力方程非振动解的存在性和振动性

研究了时间测度链上的一类二阶非线性动力方程的渐近性质和振动性质,将方程的非振动解分为3种类型,借助Banach空间的不动点定理及时间测度链上的有关理论和一些分析技巧,得到了该类方程存在非振动解的充分必要条件,同时得到了该类方程振动的充分必要条件.并给出了定理应用的例子.     

一类二阶振动矩阵方程的求解

研究了一类二阶振动矩阵方程的求解问题,该方程在振动控制领域得到广泛应用。针对具有约当对角标准型的特征值情形,提出了一种求解该二阶振动矩阵方程的参数化方法。该参数化方法给出了该矩阵方程中两个未知矩阵的完全参数化表达式,其含有自由参量为二阶振动矩阵方程的解提供了全部自由度。最后,利用所提出的二阶振动矩阵方程的参数化方法对数值算例进行了求解,结果表明该参数化方法的简单和有效性。     

横向磁场中导电梁式薄板的非线性振动分岔

在薄板的电磁弹性运动基本方程及电磁力表达式的基础上,得到了横向磁场和机械载荷共同作用下梁式薄板的振动方程,应用Calerkin法将梁式薄板的振动方程化为Duffing方程,同时将梁式薄板的非线性振动方程转化,通过求中心流形上流的方程得出分岔方程,讨论了系统的分岔并画出分岔图.     

时间测度链上一类二阶非线性动力方程的振动性

作者研究了时间测度链上的一类二阶非线性动力方程的振动性质.利用时间测度链上的理论和一些分析技巧, 作者得到了该类方程存在非振动解的必要条件及方程振动的充分条件.     

具连续变量脉冲时滞差分方程的振动性

利用构造辅助方程的方法,建立了无脉冲的具连续变量时滞差分方程与有脉冲具连续变量时滞差分方程在振动性上的等价性,然后利用反证法、构造序列法和积分中值定理等方法,研究了无脉冲的具连续变量时滞差分方程的振动性,得到了方程所有解振动的两个充分性条件,从而得到了具有连续变量脉冲时滞差分方程的所有解振动的两个充分性条件。     

一类二阶非线性差分方程的振动性

差分方程反映的是关于离散变量的变化规律.通过分析方程解的特别性质,可以把握离散变量的变化过程的规律.方程的振动性是研究方程定性理论的重要组成部分,从理论上探讨解的形态变化一直是近年来研究的热点.文章对已有文献中的线性差分方程进行了改进,研究了更普遍的方程,一类二阶非线性多时滞差分方程打振动性,利用分析的方法及积分中值定理,得到了该类方程振动的几个充分条件,并且应用差分方程的振动理论,研究了这类方程在特殊情形下解的一价差分的振动性,得到了一阶差分振动的充分条件,从而丰富了这类方程的研究成果.     

具有连续变量的2阶差分方程的振动性

利用振动理论研究一类具有连续变量的2阶非线性差分方程的振动性,得到了方程的解和解的1阶差分振动的充分条件,并且利用Banach空间的不动点原理研究这类方程的非振动解,得到了这类方程在特殊情形下的有界正解.     

具有连续变量的奇数阶时滞差分方程的振动准则

文章研究了一类具有连续变量的奇数阶非线性时滞差分方程的振动性, 得出了该类方程所有有界解振动的几个充分条件,同时得出了该类方程振动的充分条件.     

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-