Wm∨Pn的交叉数

在Klesc M给出的联图W_3 V P_n的交叉数的基础上,继续对联图Wm V Pn（m=4,5）的交叉数cr进行了研究,得到了cr（W3 V Pn）=Z（5,n）＋n＋「n/2＋1」以及cr（W5 V Pn）=Z（6,n）＋n＋3[n/2」＋1,n≥2.     

高等代数课程的教学改革

讨论高等代数的教学内容以及教学方法的改革问题,介绍我们在实践中创立的立体教学法,着重阐述俯察解析几何、仰观近世代数、联系数学分析以及半双语教学法四个基本方法．     

四元数分析中正则函数的非线性带位移边值问题

研究了四元数分析中正则函数的一类非线性带位移的边值问题.首先研究Cauchy型积分的一个性质,进而设计积分算子,将边值问题转化为积分方程问题,借助积分方程理论和Schauder不动点理论证明了边值问题解的存在性,并给出了解的积分表达式.     

On the number of polynomials with small discriminants in the Euclidean and <Emphasis Type="Italic">p</Emphasis>-adic metrics

In this article it is proved that there exist a large number of polynomials which have small discriminant in terms of the Euclidean and p-adic metrics simultaneously. The measure of the set of points which satisfy certain polynomial and derivative conditions is also determined.     

Estimates of approximation numbers and applications

In this study, the estimates of approximation numbers of embedding operators in weighted spaces have been analyzed. These estimates depend on orders of differential operators, dimensions of function spaces and weighted functions. This fact implies that the associated embedding operators belong to Schatten class of compact operators. By using these estimates, the discreetness of spectrum and completion of root elements relating to principal nonselfedjoint degenerate differential operators is obtained.     

珠算加减法新算法

一、珠算加减合一"五升十进数"口诀儿童珠算加减启蒙教学,一般主张用口诀,从数的关系方面指导拨珠;要求养成条件反射的拨珠,日后丢掉口诀。今直接引入数的分解(组成)知识及符号"∧",作为"五升十进数"口诀。口诀的句数少,每句的字数少,便于融入小学数学课本,且外国小朋友也容易看懂,它便于向世界各国推广。     

“对数与对数运算（一）”的教学设计

一、教材分析 “对数与对数运算”作为高一新教材的内容,被安排在第一册第二章“基本初等函数”的第二节,共分三个课时完成,对数概念为第一课时．对数概念对于高一的学生来讲是一个全新的概念．此前,学生已学习了指数及指数函数,明白了指数运算是已知底数和指数求幂值,而对数则是已知底数和幂值求指数,二者是互逆的关系．对数概念的引入,以凸显高中数学新课程理念中的“运算思想”和“函数思想”,对数概念的学习,既加深了学生对指数的理解,又为后面对数的运算性质及对数函数的学习做了充分准备,起到了承上启下的作用．     

考虑井储和表皮效应的分形介质煤层气压力动态分析

考虑煤层的双重介质特征和介质的分形特征,建立了考虑井筒储存和表皮效应影响的分形介质煤储层非平衡吸附、非稳态条件下的气体流动数学模型,并分别求得了无限大地层条件下中心一口井定产量生产时无因次井底压力的Laplace空间解析解和实空间上的数值解.给出了无因次井底压力及其导数随分形参数、无因次井筒储存系数以及表皮系数等变化的双对数曲线图.     

Multiphase fluid dynamics and transport processes of low capillary number cavitating flows

To better understand the multiphase fluid dynamics and associated transport processes of cavitating flows at the capillary number of 0.74 and 0.54, and to validate the numerical results, a combined computational and experimental investigation of flows around a hydrofoil is studied based on flow visualizations and time-resolved interface movement. The computational model is based on a modified RNG k-ε model as turbulence closure, along with a vapor-liquid mass transfer model for treating the cavitation process. Overall, favorable agreement between the numerical and experimental results is observed. It is shown that the cavi- tation structure depends on the interaction of the water-vapor mixture and the vapor among the whole cavitation stage, the interface between the vapor and the two-phase mixture exhibits substantial unsteadiness. And, the adverse motion of the interface relates to pressure and velocity fluctuations inside the cavity. In particular, the velocity in the vapor region is lower than that in the two-phase region.     

双图的一些脆弱性参数

一个图G的双图（double graphs）的定义为D[G]=G×T2,这里×表示图的直积,而死表示两个顶点的全图．本文研究了图的双图的一些脆弱性参数．