Total coloring of graphs embedded in surfaces of nonnegative Euler characteristic

Let G be a graph which can be embedded in a surface of nonnegative Euler characteristic.In this paper,it is proved that the total chromatic number of G is △(G)+1 if △(G)9,where △(G)is the maximum degree of G.     

Tractable Partially Ordered Sets Derived from Root Systems and Biased Graphs

We study new posets Q obtained by removing from a geometric lattice L ofa biased graph certain flats indexed by a simplicial complex . (One example of L is the lattice of flats of thevector matroid of a root system B _n .) We study the structureand compute the characteristic polynomial of Q. With certainchoices of L and , including ones for which Q is alattice interpolating between those of B _n and D _n , we observe curious relationships among the roots of thecharacteristic polynomials of Q, L, and .     

Bounds for the Characteristic Functions of the System of Monomials in Random Variables and of Its Trigonometric Analogue

Using a multidimensional analogue of Vinogradov's inequality for a trigonometric integral, the upper bounds are constructed for the moduli of the characteristic functions both of the system of monomials in components of a random vector with an absolutely continuous distribution in and of the system where is uniformly distributed in [0, l]^s.     

An Accurate and Efficient Algorithm for the Computation of the Characteristic Polynomial of a General Square Matrix

An algorithm is presented for the efficient and accurate computation of the coefficients of the characteristic polynomial of a general square matrix. The algorithm is especially suited for the evaluation of canonical traces in determinant quantum Monte-Carlo methods.     

Characteristic Functions and Symbols in the Theory of Feller Processes

We derive a probabilistic expression for the symbol of the generator of a Feller process.     

关于λ/4长传输线的阻抗变换作用

本文分析和计算传输线的特性阻抗,并且给出一个阻抗匹配的方法．     

利用图像处理技术测定丝/毛混纺比的方法初探——特征参数的选择及模式识别

主要介绍了图像处理技术测定丝/毛混纺比时多种特征参数的选择及识别敏感度的分析,并利用多元分析方法对目标信号进行了识别和分类。     

迪·哈斯-范·阿耳芬效应特征周期的推导

对于确定费密面已经发展了若干强有力的实验方法,迪·哈斯－范·阿耳芬效应就是实验方法之一,但能看到的文献中都没有对迪·哈斯－范·阿耳芬效应特征周期给出较为详尽的数学推导。本文就此做了较为详尽的推导。     

砂岩油藏二次采油中剩余油饱和度的确定方法

根据地下油水渗流规律和水驱特征分析,结合矿场实践提出了确定油井各产层剩余油饱和度的分层驱替特征分析方法．在此基础上进一步确定了油层组、砂岩组等的剩余油分布．这种方法适用于中、高含水期的注水开发油田剩余油饱和度及其分布的确定,并能够根据地层渗透率的变化修正相渗曲线,在一定程度上克服了油藏数值模拟中相渗数据对地层非均质性适应不足的缺点．经安口沈检１井密闭取心的含油饱和度分析和欢５０块两口挖潜井生产实践检验、证明分层驱替特征确定剩余油饱和度的方法是正确、可靠的．     

(n,m)中谱半径最小的图的一个特征

设（ｎ,ｍ）表示具有ｎ个顶点ｍ条边的有限简单连通图,ρ（Ｇ）是Ｇ的最大特征值,也称为Ｇ的谱半径。若Ｇ∈（ｎ,ｍ）,ｍ≥ｎ＋１,且ρ（Ｇ）＝ｍｉｎ｛ρ（Ｈ）：Ｈ∈（ｎ,ｍ）｝,则Ｇ一定不含悬挂边。