G的立方图G~3的上可嵌入性

自从Nordhaus,Stewart和White[1]等引入图的最大亏格以来,图的最大亏格以及图的上可嵌入引起了广泛关注.而图的最大亏格rM(G)是指最大的整数k使得图G的一个2 胞腔嵌入到可定向的曲面Sk上.因为图在任意可定向曲面上的2 胞腔嵌入中至少有一个面,关于图的上可嵌入性,刘彦佩[2],Xuong[3]和Nebseky[4]分别给出不同形式的充要条件.主要证明下述结果:设G是一个简单图,则G3是上可嵌入的.特别地,当k≥4时,Gk也是上可嵌入的.     

G的立方图G3的上可嵌入性

自从Nordhaus，Stewan和White等引入图的最大亏格以来，图的最大亏格以及图的上可嵌入引起了广泛关注．而图的最大亏格rM(G)是指最大的整数k使得图G的一个2-胞腔嵌入到可定向的曲面Sk上．因为图在任意可定向曲面上的2-胞腔嵌入中至少有一个面，关于图的上可嵌入性，刘彦佩，Xuong和Nebseky分别给出不同形式的充要条件．主要证明下述结果：设G是一个简单图，则G^3是上可嵌入的．特别地，当k≥4时，G^4也是上可嵌入的．     

循环赛图K(i)2n与边矩阵K''''2n的K-边着色

为了让一个2n阶的完全图K2n变成一个可用于循环赛安排的循环赛图K(i)2n,给出了边矩阵和循环赛图的定义,提出了利用边矩阵K'2n的k-边着色求求解完全图K2n的k个完备匹配Mi的算法.介绍了循环赛图K(i)14,K(i)16,…,K(i)32的构造结果及其应用.     

一类近三角剖分图的上可嵌入性

-个图在某个曲面上的嵌入三角剖分该曲面.那么这个图是上可嵌入的,对于一个近三角剖分图却不一定是上可嵌人的.已经证明了平面近三角剖分图的上可嵌人性与独立边集之间的关系是:若G的对偶图G*有[1/2φ]个独立边集.那么图G的最大亏格γM(G)=(「)β(G)/2」-1.进一步讨论了平面近三角剖面图G有k个三角△1,△2,…,△k其上可嵌人的条件.     

二维可定向流形的几个定理(英文)

给出了二维可定向流形的几个定理。 (K6-E(K3) )不能三胞腔嵌入二维可定向流形 ;若围长为g的 (p ,q) -连通图能G 2 Sk,则g >3 ,q 3(p +2k - 2 ) ,q 2 (p+2h - 2 ) ;n点k -正则图G能三胞腔嵌入Sh,则h=1+n(k - 6 ) / 12。     

循环赛图K2n^（i）与边矩阵K′2n的K-边着色

为了让一个2n阶的完全图K2n变成一个可用于循环赛安排的循环赛图K(2in),给出了边矩阵和循环赛图的定义,提出了利用边矩阵K′2n的k-边着色求求解完全图K2n的k个完备匹配Mi的算法。介绍了循环赛图K(1i4),K(1i6),…,K(3i2)的构造结果及其应用。     

连通3-正则图的最大亏格与上可嵌入性

文章探讨了连通3-正则图的最大亏格与上可嵌入性,并得到了当γM(G)=「β(G)3■时连通3-正则图的结构特征.     

图的最大亏格综述(英文)

综述了近30年来关于图的最大亏格,以及它与其他不变量之间关系的重要研究进展,包括最大亏格与图的连通性、图的直径、图的染色数和图的z-因子之间的关系,最大亏格嵌入数,以及最大亏格与嵌入图等方面.     

3-正则图的最大亏格计算公式

本文主要讨论了三正则连通图的叶子数l(T)以及叶子数与图的最大亏格γM之间的关系,并给出了3-正则图的最大亏格的计算公式:γM=12(l(T) pα-pβ);这里,T是图G的XUONG树,l(T)是T的叶子数;pα,pβ分别是G-T的偶长路数和奇长圈数.作为应用我们计算了若干类图的最大亏格.     

图到其二次迭线图内的关联嵌入

图G到图H的子图上的同构称为G到H内的嵌入。本文给出图到其2次迭线图内一种特殊嵌入——关联嵌入的分类,证明每个可关联嵌入到共2次迭线图内的连通图,都能夠由一个称为胚的可嵌入子图通过一系列扩张得到,而图的胚依据形状可分为四种类型:H_k(k≥0),C_n(n≥3),A_k(k≥-2,k≠0)和B_k(k≥-3)。此外,本文还研究了关联嵌入的计数与共轭性。     

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-