对一维原子链晶格振动的讨论

一维原子链晶格振动是晶格振动理论的基础。本文就一维双原子链和一维单原子链振动性质的不同进行研究,阐明二者的关系。     

一维双原子晶体的表面格波

本文将H.Puszkarski法加以推广,用以讨论一维双原子晶体的表面格波,从而得出在一维双原子晶体中表面格波的存在条件和一系列与单原子晶体不同的结果.本文还对各种表面格波中的原子振动方式作了一定的描述.     

一维非线性双原子链晶格振动的色散关系

在小振动情况下,讨论非简谐项对一维双原子链晶格振动色散关系的影响;对于三次方在位非线性力的作用,得到一维双原子非线性链晶格振动的色散关系,分析了光频支和声频支色散关系在非线性作用下的变化;色散关系的频隙在非线性力的作用下发生变化,且频隙的位置将降低（非线性系数为正）或升高（非线性系数为负）。     

一维β-FPU双原子链中呼吸子解的存在及稳定性分析

采用线性稳定性分析的方法,讨论了一维β-FPU双原子链中呼吸子解的稳定性问题.首先在驻波边界条件下数值求解一维β-FPU双原子链晶格振动的方程组,得到了存在于该模型中的能隙呼吸子随时空演化的图形.此后引入线性稳定性分析方法,将其运用到一维β-FPU双原子链模型中,得到无论是非线性系数β>0(硬非线性情况)还是β<0时(软非线性情况),呼吸子解都是临界稳定存在的.     

同类双原子链一维量子振动的严格解

以量子力学变换严格求解了同类双原子链的一维量子耦合振动,得出了变换矩以及2N个原子振动的频谱。当N为一大数时,作者求解的频谱与以经典力学推导出的频谱相似,但不完全相同。     

一维双原子点阵的局域振动

本文应用格林函数方法,对于含有一个质量和力常数都与基质原子不同的各向异性杂质的一维双原子点阵,详细地计算和讨论了局域振动模在各种情形下存在的临界条件。局域振动问题,在晶体的红外光谱和表面电子态等的研究中已引起了更多的注意。关于一维点阵中,替代式杂质原子产生的局域振动问题,已有不少作者采用多种方     

一维双原子链晶格振动u_(2n 1)(q)≠u_(2n 1)(q (2π/2a))谬误的分析

对一维双原子链晶格振动的u2n 1(q)≠u2n 1(q 2π2a)谬误进行分析 ,给出了正确的关系式 ,进一步给出了一维三原子链晶格振动的波矢q振动模与相差一个倒格矢的振动模等同的有关关系式 .     

一维双原子链晶格振动u2n＋1（q）≠u2n＋1（q＋2π／2α

对一维双原子链晶格振动的u2n 1(q)≠u2n 1(q 2π/2α谬误进行分析,给出了正确的关系式,进一步给出了一维三原子链晶格振动的波矢q振动模与相差一个倒格矢的振动模等同的有关关系式。     

一维双原子链比热的研究

对于一维双原子链组成的晶格,可以求出频谱密度,进而可以求出晶格的振动能和比热,并进行了数值计算。结果表明：对于一维双原子链的晶格比热,在高温时与经典理论吻合,在低温时也符合徳拜定律,但在中温区相对原子量对比热有影响。     

一维单原子链非线性振动的孤子解和呼吸子解

运用连续极限近似，求解一维单原子链的非线性振动方程，得到了一维单原子晶格振动的孤子解．在考虑三次非简谐势的情况下，一维单原子链晶格振动具有扭结孤子解，在考虑具有四次非简谐势的情况下，得到一维单原子链晶格振动具有呼吸子解。     

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-