变系数非线性Dirichlet问题正解的局部存在性

考察了一类具有变系数非线性二阶Dirichlet问题的正解,利用常系数二阶Dirichlet问题的Green函数,把这一问题转化为一个等价的积分方程,通过考察相应非线性算子的不动点,给出了这个问题正解局部存在的某些充分条件.     

两端固定的弱半正梁方程的解和正解

考察了两个端点固定的非线性四阶弹性梁方程的解和正解的存在性与多解性, 其中非线性项可以没有下界.主要工具是积分方程技巧 和锥上的不动点定理.所有存在性与多解性结论都依赖于非线 性项在某些有界集上的“高度”,同时与非线性项在这些有界集合以 外的增长无关.     

变系数四阶周期边值问题正解的局部存在与多解性

考察了一类变系数非线性四阶周期边值问题的正解存在性与多解性.主要工具是相关线性问题的Green函数,积分方程以及锥上的不动点指数定理.结论表明,这个问题可以具有n个正解,只要非线性项在某些有界集上的增长速度函数受到系数函数控制,其中n是一个任意的自然数.     

非线性二阶周期边值问题的n个正解的存在性

通过选择适当的控制函数并利用锥上的小动点定理研究了一类非线性二阶周期边值问题的正解存在性与多解性.利用相应线性问题的Green函数将边值问题化为积分方程,然后考察该积分方程在锥上的不动点.结果表明,只要非线性项在其定义域的某些有界子集上的增长速度足合适的,该问题至少具有n个正解,其中n是一个任意的正整数.     

一类含一阶导数的二阶三点边值问题的可解性

利用积分方程,作者通过构造适当的Banach空间考察了一类含有一阶导数的二阶三点边值问题的解和正解的存在性.利用Leray-Schauder不动点定理,作者证明了只要非线性项在其定义域的某个有界子集上的"高度"是适当的则该类问题可以有一个解或者正解.     

一类非线性分数阶微分方程边值问题正解的存在性

研究了一类非线性分数阶微分方程边值问题正解的存在性. 主要方法是锥内的 Krasnosel'skii 不动点定理的应用.结果表明: 只要非线性项在某些有界集合上的 "高度" 是适当的, 该问题有n个正解 (n是一个任意给定的正整数).     

一类非线性弹性梁方程的正周期解

利用锥上的不动点指数定理考察了一类非线性弹性梁方程的正周期解的局部存在性. 这类方程没有Green函数,通过适当的变换克服了这个困难. 主要结论表明该类方程能够具有n个正解, 只要非线性项在某些有界集合上的最大值和最小值都是适当的.     

含一阶导数的半线性四阶边值问题的多重正解

通过构造适当的锥并且利用方程的分解技巧研究了一类含一阶导数的半线性四阶边值问题的正解.主要工具是三阶两点边值问题的一个Green函数及锥拉伸与锥压缩型的Krasnasel'skii不动点定理.在力学中,这类问题描述了一端固定,另一端活动的弹性梁的形变.结论表明只要非线性项在某些有界集合上的"高度"适当,这类问题至少存在n个正解.     

奇异Neumann边值问题的多重正解

通过引入与非线性项有关的高度函数,考察了非线性项为局部Caratheodory函数的奇异二阶Neumann边值问题的正解.主要结论表明,只要高度函数在某些有界集合上的积分是适当的,该问题能够具有n个正解,其中n是一个任意的正整数.     

变系数三阶周期边值问题的正解

研究了变系数非线性三阶周期边值问题的正解.非线性项可以关于空间变元奇异.利用适当的变换此问题被转换为一个Hammerstein积分方程,利用锥上的 Guo-Krasno-sel'ski 不动点定理获得了1~2个正解的存在性.     

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-