图的λ_k最优性和超级性(k=2,3)的邻域交与边度条件

本文给出了图的λk最优性和超级性(k=2,3)的用邻域交与边度表示的充分条件.     

广义斯坦纳系GSk+1(2,k,v,g)的一个构造方法及简单应用

给出了广义斯坦纳系GSk 1(2,k,v,g)的一个递推构造方法，并给出了当k=4时该方法的一个简单应用。     

图的λk最优性和超级性的充分条件

分别给出了直径为2的图的λ3最优性和不含三角的图是超级λk的一个充分条件,讨论了不含三角的图的λk最优性和λk超级性的关系,这些结果在网络可靠性分析中有一定应用．     

k圈轮的Cordial性

以Cn 表示n圈 ,设Gk=Cn1∪…∪Cnk,顶点s V(Gk) ,称GkV{s}是k圈轮 .本文给出k圈轮是Cordial图的充要条件为 ∑ki=1ni 3(mod4 ) .     

Cn与1Cn的优美标号

设k1,k2,…,kn是非负整数,Cn=v1v2…vnv1是有n个顶点n条边的圈,则称图Cn+{v1v11,v1v12,…,v1v1k1,v2v21,…v2v2k2,…,vnvn1,…,vnvnkn}为(k1,k2,…,kn)轮环图,简记为C(k1,k2,…,kn)·本文研究了圈Cn与图C(k1,k2,…,kn)的优美性,给出图Cn与1Cn在n=4k与n=4k+3时的优美标号算法,从而证明了它们都是优美图等结论.     

凝聚场缺方向性的一个充分条件及其应用

本文给出了凝聚场缺方向性的一个充分条件,从而推出凝聚场和 k 集压缩场其拓扑度等于零的充分条件.作为应用,得到了某些关于固有值及不动点的定理.     

图的邻域并和连通的[k,k+1]-因子

设G是阶为n的图.F是G的支撑子图且对所有的x∈V(G)都有k≤dF(x)≤k+1,则称F为G的[k,k+1]-因子.一个[k,k+1]-因子如果连通,则称为连通的[k,k+1]-因子.一个[k,k+1]-因子若包含一个哈密顿圈,则称为哈密顿[k,k+1]-因子.给出了图有哈密顿[k,k+1]-因子或连通的[k,k+1]-因子关于邻域并的若干新的充分条件.     

二部图的K1,4-因子分解

Km,n的K1,k-因子分解问题已被多位研究者所研究,当k=2时Km,n具有K1,2-因子分解的存在性问题已被Ushio完全解决.当k=3时Wang研究了Km,n的K1,3-因子分解问题,并给出了Km,n具有K1,3-因子分解的一个充分条件.本文研究Km,n的K1,4-因子分解问题,并给出Km,n具有K1,4-因子分解的一个充分条件.     

2^n周期平衡二元序列的2错线性复杂度

线性复杂度和k错线性复杂度是度量密钥流序列的密码强度的重要指标.Meidl给出奇数个非零元素的2^n周期二元序列的1错线性复杂度分布情况.基于Games-Chan算法,文中讨论了更为重要的偶数个非零元素的2^n周期二元序列的2错线性复杂度分布情况.给出了对应k错线性复杂度序列的完整计数公式,k=2,3.对于一般的2n周期二元序列,也可以使用该方法给出对应k（k＞2）错线性复杂度序列的计数公式.     

图是超级λk-连通(k=4,5)的一个Ore型充分条件

图的k阶限制边连通度λk（G）对衡量网络可靠性起重要的作用．本文给出图是超级λk（k=4,5）连通的一个Ore型条件．     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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.     

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-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the