检索结果-南通市图书馆

Extrapolation of Mixed Finite Element Approximations for the Maxwell Eigenvalue Problem

在线全文

学校读者我要写书评

暂无评论

Numerical Mathematics(Theory,Methods and Applications) 2011年第3期4卷 379-395页

作者： Changhui Yao Zhonghua Qiao Department of Mathematics Zhengzhou UniversityZhengzhouChina Institute for Computational Mathematics&Department of Mathematics Hong Kong Baptist UniversityKowloon TongHong Kong.

In this paper,a general method to derive asymptotic error expansion formulas for the mixed finite element approximations of the Maxwell eigenvalue problem is *** lemmas for the error of the eigenvalue approximations are ob*** on the asymptotic error expansion formulas,the Richardson extrapolation method is employed to improve the accuracy of the approximations for the eigenvalues of the Maxwell system from O(h2)to O(h4)when applying the lowest order Nédélec mixed finite element and a nonconforming mixed finite *** our best knowledge,this is the first superconvergence result of the Maxwell eigenvalue problem by the extrapolation of the mixed finite element *** experiments are provided to demonstrate the theoretical results.

关键词： Maxwell eigenvalue problem mixed finite element asymptotic error expansion Richardson extrapolation.

On the number of matchings of graphs formed by a graph operation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Mathematics 2006年第10期49卷 1383-1391页

作者： YEH Yeong-Nan Institute of Mathematics Academia Sinica

Let G be a simple graph. Define R(G) to be the graph obtained from G by adding a new vertex e* corresponding to each edge e = (a, b) of G and by joining each new vertex e* to the end vertices a and b of the edge e corresponding to it. In this paper, we prove that the number of matchings of R(G) is completely determined by the degree sequence of vertices of G.

关键词： matching, Hosoya index, matching polynomial, oriented incident matrix,skew adjacency matrix.

Seismic performance of precast bridge columns connected with grouted corrugated-metal duct through biaxial quasi-static experiment and modeling

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2021年第3期20卷 747-770页

作者： Xia Zhanghua Lin Shangshun He Yongbo Ge Jiping Sun Jinlei Department of Civil Engineering Fuzhou UniversityFuzhou 350116China Department of Civil Engineering Fujian University of TechnologyFuzhou 350116China Department of Civil Engineering Shanghai Institute of TechnologyShanghai 201418China

In this paper,the seismic behaviors of precast bridge columns connected with grouted corrugated-metal duct(GCMD)were investigated through the biaxial quasi-static experiment and numerical *** a geometric scale ratio of 1:5,five specimens were fabricated,including four precast bridge columns connected with GCMD and one cast-in-place(CIP)bridge column.A finite element analysis model was also established by using OpenSees and was then calibrated by using the experimental results for parameter *** results show the biaxial seismic performance of the precast bridge columns connected with GCMD was similar to the CIP bridge columns regarding ultimate bearing capacity and hysteresis energy,and further,that it could meet the design goal of equivalent *** seismic performance of the precast bridge columns connected with GCMD deteriorated more significantly under bi-directional load than under uni-directional load.A proper slenderness ratio(e.g.,7.0-10.0)and longitudinal reinforcement ratio could significantly improve the energy dissipation capacity and deformation capacity of the precast bridge columns,while the axial load ratio and concrete strength had little influence on the above *** research results could bring insights to the development of the seismic design of precast bridge columns connected with GCMD.

关键词： precast bridge column cast-in-place column grouted corrugated-metal duct connection biaxial quasi-static test seismic performance hysteresis energy

在线全文

学校读者我要写书评

暂无评论

理想收敛与几乎处处收敛（英文）

数学进展 2015年第6期44卷 939-944页

作者：鲍玲鑫福建农林大学计算机与信息学院福州福建350002

本文试图利用统计测度理论刻画Banach空间X中的序列为理想L-几乎处处收敛的特征.设L2^N为任意一个统计型的理想,令XL=span{χA：A∈L}e∞,pL为商空间e∞/XL的商范数,pL（e）表示半范数pL在e≡χN点的次微分映射.本文证明了x^＊∈... 详细信息

本文试图利用统计测度理论刻画Banach空间X中的序列为理想L-几乎处处收敛的特征.设L2^N为任意一个统计型的理想,令XL=span{χA：A∈L}e∞,pL为商空间e∞/XL的商范数,pL（e）表示半范数pL在e≡χN点的次微分映射.本文证明了x^＊∈pL（e）为一个端点当且仅当x^＊是保正交不变的.证明了序列（xn） X L-几乎处处收敛于x∈X当且仅当存在（xn）的一个子列（x（nk））使得xnk→x（k→∞）且对任意x^＊∈extpL（e）,x^＊为{e（nk）}的w^＊-聚点,其中extpL（e）表示集合pL（e）的所有端点构成的集合.

关键词：理想收敛几乎处处收敛端点统计测度 Banach空间

在线全文

学校读者我要写书评

暂无评论

蕴含K4+P2-可图序列的刻划（英文）

数学研究 2009年第4期42卷 375-382页

作者：王艳黄伟兰漳州师范学院数学与信息科学系

对于给定的图H,若存在可图序列π的一个实现包含H作为子图,则称π为蕴含H-可图的.Gould等人考虑了下述极值问题的变形:确定最小的偶整数σ（H,n）,使得每个满足σ（π）≥σ（H,n）的n项可图序列π=（d1,d2,…,dn）是蕴含H-可图的,其中... 详细信息

对于给定的图H,若存在可图序列π的一个实现包含H作为子图,则称π为蕴含H-可图的.Gould等人考虑了下述极值问题的变形:确定最小的偶整数σ（H,n）,使得每个满足σ（π）≥σ（H,n）的n项可图序列π=（d1,d2,…,dn）是蕴含H-可图的,其中σ（π）=∑di.本文刻划了蕴含K4+P2-可图序列,其中K4+P2是向K4的一个顶点添加两条悬挂边后构成的简单图.这一刻划导出σ（K4+P2,n）的值.

关键词：图度序列蕴含K4+P2-可图序列