k-途径正则有向图

In this paper, we define a class of strongly connected digraph, called the k-walk- regular digraph, study some properties of it, provide its some algebraic characterization and point out that the 0-walk-regular digraph is the same as the walk-regular digraph discussed by Liu and Lin in 2010 and the D-walk-regular digraph is identical with the weakly distance-regular digraph defined by Comellas et al in 2004.     

隐式重启精化全局Lanczos方法

The numerical methods for solving large symmetric eigenvalue problems are considered in this paper.Based on the global Lanczos process,a global Lanczos method for solving large symmetric eigenvalue problems is presented.In order to accelerate the convergence of the F-Ritz vectors,the refined global Lanczos method is developed.Combining the implicitly restarted strategy with the deflation technique,an implicitly restarted and refined global Lanczos method for computing some eigenvalues of large symmetric matrices is proposed.Numerical results show that the proposed methods are efficient.     

分次环的分次σ-根

在分次环类中定义H-关系,利用H-关系给出分次σ-根的定义,并进一步得到分次环类γ是分次σ-根的几个充分必要条件.     

叠加码的一些新构作

利用集合的并与直积运算建立了新的二元矩阵,从而在已有的叠加码的基础上构作了一些新的叠加码.     

重掺杂AZO透明导电薄膜的光电特性

以Al质量分数为2%的ZnO陶瓷靶为靶材,在氧气气氛中,采用脉冲激光沉积方法(PLD)在石英衬底表面生长了重掺杂的ZnO:Al(AZO)薄膜.通过X射线衍射仪、紫外可见分光光度计、微区拉曼光谱仪、霍尔测量仪对合成薄膜材料的晶体结构、光学、电学性质等进行了研究.结果表明:所制备的AZO薄膜呈现具有高度c轴择优取向的ZnO...     

基于取整最小二乘的全局相位展开新方法

基于取整操作和全局最小二乘,提出了一种快速简单的相位展开算法;不同与传统的相位展开方法,该算法通过一种非迭代的和健壮的方法来处理相位跳变部分的梯度;因此,降低了残差点的传播和平滑的影响;并用提出的算法与四种经典的相位展开算法:切枝法、最小费用流法(MCF)、质量图导向(QG)和快速傅里叶变换(FFT)进行对比;通过计算机模拟和实验结果表明:该算法仅仅需要与FFT方法相接近的较低的运算时间,就能达到比MCF方法更高的精度;而且,该算法运算速度快,非常简单,可以在干涉测量技术中得到实时的应用。