一类具有对数非线性项的伪抛物方程的初边值问题

研究有界区域内一类具有对数非线性项的伪抛物方程的齐次Dirichlet初值问题.分别在低初始能量0J(u_0)d和临界初始能量J(u_0)=d条件下,研究了问题的弱解的整体存在性.此外,在适当假设下,得到了问题的弱解的唯一性及其在有限时间内发生爆破的结果.     

具有边界阻尼和非线性对数源项的波方程的能量衰减

对数型源项问题广泛存在于膨胀宇宙学、超对称场论和量子力学中.为了深入研究对数型源项对波方程能量衰减的影响,讨论了具有边界阻尼、线性强阻尼、非线性弱阻尼和非线性源项的波方程的初边值问题.在合适的假设条件下,通过构造稳定集和Lyapunov泛函,利用势阱方法分别证明了在E(0)相似文献   

一类带记忆项的非线性Petrovsky方程解的爆破时间下界估计

考虑如下具有记忆项的非线性Petrovsky方程:utt+Δ~2u-∫t0g(t-τ)Δ~2 u(x,τ)dτ+︱u_t︱~(q-2) ut=︱u︱~( p-2) u,具Dirichlet边界条件的初边值问题。当松弛函数g满足适当的条件时,该问题的解在有限时间内会爆破。进一步对解的爆破时间进行研究,给出了正的初始能量下解的爆破时间的下界估计。     

一类具有记忆项的双曲型方程解的能量衰减估计

讨论了一类带记忆项的双曲型的阻尼波动方程解的能量衰减估计问题.此类方程的损耗十分微弱,且包含在记忆项中.利用乘子思想,构造等价于能量函数E(t)的Lyapunov函数L并利用微分不等式来得到相应的解的能量衰减估计.     

黄头鹡鸰雏鸟生长能学的研究

在黄头 (Motacillacitreola)自然生长状态下 ,通过测定雏鸟气体代谢和身体组织能量积累的方法 ,研究了它们在生长期间的能量投入 .最小能量投入在 0～ 1d (d为日龄 ,用t表示 ) ,为 10 82kJ/d . 1只雏鸟需要能量为 414 2 6kJ,其中生产能为 15 3 14kJ,用于维持的能量是 2 6 1 12kJ .     

确定耦合双曲-抛物方程组低阶项的系数

本文证明了在某些条件下,确定耦合的双曲-抛物方程组低阶项系数的反问题(带有Dirichlet-Cauchy数据)在H~8空间内存在有唯一的解。主要的工具是能量不等式。     

确定耦合双曲-抛物方程组低阶项的系数

本文证明了在某些条件下,确定耦合的双曲-抛物方程组低阶项系数的反问题(带有Dirichlet-Cauchy数据)在H~5空间内存在有唯一的解。主要的工具是能量不等式。     

给定直径的单圈图的极小匹配能量

图的匹配能量定义为该图的匹配多项式的零点的绝对值之和.设U(n,d)为n阶且直径为d的连通单圈图的集合,刻画了U(n,d)中取到极小匹配能量的极图.     

四元环芳香体系N2S2的量子化学计算研究

在UB3L YP／6-311 G(d，P)、UB3L YP／6-311 G(3df，2p)、UB3L YP／AUG-CC-PVTZ，UQCISD／6-311 G(d，p)水平优化得到了N2S2单、三重态的平衡几何构型，发现单重态N2S2为能量最低的稳定分子。用优化的最稳定单重态N2S2结构在UB3L YP／6-311 G(d，p)／／UB3L YP／6-311 G(d，P)，UB3L YP／6-311 G(3df，2p)／／UB3L YP／6-311 G(3df，2p)计算同键反应芳香性稳定化能(HASE)。用基团加和法(group increment approach)在UB3L YP／6-311 G(d，P)／／UB3L YP／6-311 G(d，P)和UB3L YP／6-311 G(3df，2p)／／UB3L YP／6-311 G(3df，2p)水平计算磁化率增量(A)，计算结果表明N2S2分子的键长发生了平均化。同键反应芳香性稳定化能和磁化率增量均为负值．表明N2S2具有芳香性．实现了N2S2分子芳香性的几何、能量和磁性的判定．     

3d和4s轨道的能量关系初探

我们在无机化学和结构化学的学习中,经常遇到这样的问题:3d和4s轨道的能量到底哪一个高?电子在填充这些轨道时,遵循什么规律,按照什么顺序?电离时首先失去的是哪个轨道上的电子?这些问题,现有的新版高校教材都没有予以圆满地、系统的阐述.目前,国内外的一些化学工作者都在积极地探讨这些问题.本文试从量子力学的基本假设出发,推出3d和4s轨道的能量计算公式,借助于斯莱特(Slatar)规则定量地计算出1～36号元素原子的3d和4s轨道能量,同时也计算了电子在这些轨道上排布时各种可能组态的能量,从而在解释上述问题时得到了比较满意的结果.     

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-