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GH-CONGRUENCE CANONICAL FORM OF QUATERNION MATRIX AND SIMULTANEOUS DIAGONALIZATION OF MATRICES 被引量:1
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作者 Zhang Jinchuan(Dept.of Math.,Quanzhou Normal college,Quanzhou,Fujian,362000) 《Numerical Mathematics A Journal of Chinese Universities(English Series)》 SCIE 2000年第S1期122-128,共7页
In this paper,the GH-congruence canonical forms of positive semidefinite and definte inite and definite(need not be self-conjugate)quaternion matrices are given,and a neccessary and sufficientcondition of GH-congruenc... In this paper,the GH-congruence canonical forms of positive semidefinite and definte inite and definite(need not be self-conjugate)quaternion matrices are given,and a neccessary and sufficientcondition of GH-congruence for two positive semidifinite(definite)quaternion matrices isgiven also.Then simultaneous GH-congruence reduced forms for two self-conjugate matri-ces and some result about the simultaneous GH-congruence diagonalization of quaternionmatrices are obtained. 展开更多
关键词 GH-CONGRUENCE CANONICAL FORM OF QUATERNION matrix AND SIMULTANEOUS diagonalization OF MATRICES REAL EGL PBP FORM
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THE STRESS SUBSPACE OF HYBRID STRESS ELEMENT AND THE DIAGONALIZATION METHOD FOR FLEXIBILITY MATRIX H 被引量:2
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作者 张灿辉 冯伟 黄黔 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2002年第11期1263-1273,共11页
The following is proved: 1) The linear independence of assumed stress modes is the necessary and sufficient condition for the nonsingular flexibility matrix; 2) The equivalent assumed stress modes lead to the identica... The following is proved: 1) The linear independence of assumed stress modes is the necessary and sufficient condition for the nonsingular flexibility matrix; 2) The equivalent assumed stress modes lead to the identical hybrid element. The Hilbert stress subspace of the assumed stress modes is established. So, it is easy to derive the equivalent orthogonal normal stress modes by Schmidt's method. Because of the resulting diagonal flexibility matrix, the identical hybrid element is free from the complex matrix inversion so that the hybrid efficiency, is improved greatly. The numerical examples show that the method is effective. 展开更多
关键词 hybrid stress finite element Hilbert stress subspace diagonalization method for flexibility matrix
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New Criteria for Judging Generalized Strictly Diagonally Dominant Matrix 被引量:1
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作者 ZHANG Jin-song 《Chinese Quarterly Journal of Mathematics》 2015年第2期166-171,共6页
Generalized strictly diagonally dominant matrices play a wide and important role in computational mathematics, mathematical physics, theory of dynamical systems, etc.But it is difficult to judge a matrix is or not gen... Generalized strictly diagonally dominant matrices play a wide and important role in computational mathematics, mathematical physics, theory of dynamical systems, etc.But it is difficult to judge a matrix is or not generalized strictly diagonally dominant matrix.In this paper, by using the properties of α-chain diagonally dominant matrix, we obtain new criteria for judging generalized strictly diagonally dominant matrix, which enlarge the identification range. 展开更多
关键词 generalized strictly diagonally dominant matrix CRITERIA s-chain diagonallydominant matrix
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A New Approximation to the Linear Matrix Equation AX = B by Modification of He’s Homotopy Perturbation Method 被引量:1
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作者 Amir Sadeghi 《Advances in Linear Algebra & Matrix Theory》 2016年第2期23-30,共8页
It is well known that the matrix equations play a significant role in engineering and applicable sciences. In this research article, a new modification of the homotopy perturbation method (HPM) will be proposed to obt... It is well known that the matrix equations play a significant role in engineering and applicable sciences. In this research article, a new modification of the homotopy perturbation method (HPM) will be proposed to obtain the approximated solution of the matrix equation in the form AX = B. Moreover, the conditions are deduced to check the convergence of the homotopy series. Numerical implementations are adapted to illustrate the properties of the modified method. 展开更多
关键词 matrix Equation Homotopy Perturbation Method CONVERGENCE Diagonally Dominant matrix Regular Splitting
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GENERALIZED DIAGONALIZATION OF MATRICES OVER QUATERNION FIELD
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作者 姜同松 陈丽 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1999年第11期1297-1304,共8页
A concept of [GRAPHICS] diagonalization matrix over quaternion field is given, the necessary and sufficient conditions for determining whether a quaternion matrix is a [GRAPHICS] diagonalization one are discussed, and... A concept of [GRAPHICS] diagonalization matrix over quaternion field is given, the necessary and sufficient conditions for determining whether a quaternion matrix is a [GRAPHICS] diagonalization one are discussed, and a method of [GRAPHICS] diagonalization of matrices over quaternion field is given. 展开更多
关键词 complex quaternion ring quaternion field matrix diagonalization matrix
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Criteria Condition for Generalized Diagonally Dominant Matrices 被引量:3
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作者 田素霞 《Chinese Quarterly Journal of Mathematics》 CSCD 2001年第1期102-106,共5页
In this paper, we provide some new necessary and sufficient conditions for generalized diagonally dominant matrices and also obtain some criteria for nongeneralized dominant matrices.
关键词 generalized diagonally dominant matrices Positive diagonal matrix criteria condition
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Electric dipole moments of lithium atoms in Rydberg states
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作者 董慧杰 黄可树 +3 位作者 李昌勇 赵建明 张临杰 贾锁堂 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第9期170-173,共4页
Recently, the diverse properties of Rydberg atoms, which probably arise from its large electric dipole moment (EDM), have been explored. In this paper, we report electric dipole moments along with Stark energies and... Recently, the diverse properties of Rydberg atoms, which probably arise from its large electric dipole moment (EDM), have been explored. In this paper, we report electric dipole moments along with Stark energies and charge densities of lithium Rydberg states in the presence of electric fields, calculated by matrix diagonalization. Huge electric dipole moments are discovered. In order to check the validity of the EDMs, we also use these electric dipole moments to calculate the Stark energies by numerical integration. The results agree with those calculated by matrix diagonalization. 展开更多
关键词 electric dipole moment Stark energy charge density matrix diagonalization
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Studyon hardware-in-the-loopsimulation of beer fermentation system
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作者 姚超修 郑娟娟 +1 位作者 蒋玉龙 赵有波 《Journal of Measurement Science and Instrumentation》 CAS 2014年第1期71-74,共4页
Beer fermentation process is a complex biochemical reaction process.It is the most important to control temperature of the wort in fermentation tank in accordance with the beer fermentation temperature curve so as to ... Beer fermentation process is a complex biochemical reaction process.It is the most important to control temperature of the wort in fermentation tank in accordance with the beer fermentation temperature curve so as to ensure the completion of fermentation.The controlled object is characterized by large inertia,long time delay and mutual coupling of three temperature areas.Based on this,a temperature control method for beer fermentation system is designed.Using digital incremental proportion integration differentiation (PID) control algorithm,the controlled quantity is transmitted to the controlled object after diagonal matrix decoupling.This simulation system can be completed in laboratory using VB and Kingview software,so it has the features of good security and low cost.It is very suitable for experimental teaching. 展开更多
关键词 beer fermentation system hardware-in-the-loop simulation diagonal matrix decoupling proportion integration differentiation (PID) control algorithm
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Necessary and Sufficient Condition for Generalized Diagonal Dominance Matrices 被引量:1
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作者 杨益民 《Chinese Quarterly Journal of Mathematics》 CSCD 1996年第2期26-29,共4页
In the paper,a necessary and sufficeent condition for generalized diagonal domiance matrices is given.Further, the relations among all generalized positive definite matrices are shown, also,some flaws and mistakes in... In the paper,a necessary and sufficeent condition for generalized diagonal domiance matrices is given.Further, the relations among all generalized positive definite matrices are shown, also,some flaws and mistakes in the references are corrected. 展开更多
关键词 generalized diagonal dominance matrix generalized positive definite matrix M-matrix
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Sufficient Conditions of Nonsingular H-matrices
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作者 王广彬 洪振杰 高中喜 《Journal of Shanghai University(English Edition)》 CAS 2004年第1期35-37,共3页
From the concept of α diagonally dominant matrix, two sufficient conditions of nonsingular H-matrices were obtained in this paper. An example was given to show that these results improve the known results.
关键词 diagonally dominant matrix nonsingular H-matrix.
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Comparison of Two Simulation Methods in Electron Crystallography: BW Method and a Modified Direct Product Method of Scattering Matrix
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作者 Yi Yang Canying Cai Qibin Yang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2017年第2期210-214,共5页
In this paper, a modified direct product method of scattering matrix (DPSM) was presented and the cal- culation formulawas derived as follows: φ(z)=∑n1/n!(Mz)nφ(O)and φ(z+εj)=∑n1/n!(Mεj)nφ(z),... In this paper, a modified direct product method of scattering matrix (DPSM) was presented and the cal- culation formulawas derived as follows: φ(z)=∑n1/n!(Mz)nφ(O)and φ(z+εj)=∑n1/n!(Mεj)nφ(z),whereM is the scattering matrix of which the dimension can be reduced by 'Bethe potential method' drastically and therefore the calculation speed can be increased tremendously without losing accuracy very much. The results calculated with the DPSM method are in almost exact agreement with those calculated with BW method. However, the calculation speed for the modified DPSM method is approximately three times faster than that for the BW method. Furthermore, the DPSM is suitable for computing all types of ma- trices without requiring symmetry or conjugate symmetry. 展开更多
关键词 Electron crystallography Image simulation Bethe potential method matrix diagonalization
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State of Charge Estimation for Lithium-Ion Battery Based on Improved Cubature Kalman Filter Algorithm 被引量:1
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作者 Guochun Li Chang Liu +1 位作者 Enlong Wang Limei Wang 《Automotive Innovation》 CSCD 2021年第2期189-200,共12页
An improved cubature Kalman filter(CKF)algorithm for estimating the state of charge of lithium-ion batteries is proposed.This improved algorithm implements the diagonalization decomposition of the covariance matrix an... An improved cubature Kalman filter(CKF)algorithm for estimating the state of charge of lithium-ion batteries is proposed.This improved algorithm implements the diagonalization decomposition of the covariance matrix and a strong tracking filter.First,a first-order RC equivalent circuit model is first established and verified,whose voltage estimation error is within 1.5%;this confirms that the model can be used to describe the characteristics of a battery.Then the calculation processes of the traditional and proposed CKF algorithms are compared.Subsequently,the improved CKF algorithm is applied to the state of charge estimation under the constant-current discharge and dynamic stress test conditions.The average errors for these two conditions are 0.76%and 1.2%,respectively,and the maximum absolute error is only 3.25%.The results indicate that the proposed method has higher filter stability and estimation accuracy than the extended Kalman filter(EKF),unscented Kalman filter(UKF)and traditional CKF algorithms.Finally,the convergence rates of the above four algorithms are compared,among which the proposed algorithm track the referenced values at the highest speed. 展开更多
关键词 Lithium-ion battery State of charge Cubature Kalman filter Strong tracking filter Covariance matrix diagonalization decomposition
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GENERALIZED NEKRASOV MATRICES AND APPLICATIONS 被引量:20
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作者 Mingxian Pang Zhuxiang Li (Dept. of Math, of Normal college, Beihua University, Ji Lin 132013, China) 《Journal of Computational Mathematics》 SCIE CSCD 2003年第2期183-188,共6页
In this paper, the concept of generalized Nekrasov matrices is introduced, some properties of these matrices are discussed, obtained equivalent representation of generalized diagonally dominant matrices.
关键词 Nekrasov matrix Generalized Nekrasov matrix Generalized diagonally domi- nant matrix.
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Optimal Estimation for Power of Variance with Application to Gene-Set Testing 被引量:1
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作者 Min XIAO Ting CHEN +1 位作者 Kunpeng HUANG Ruixing MING 《Journal of Systems Science and Information》 CSCD 2020年第6期549-564,共16页
Detecting differential expression of genes in genom research(e.g.,2019-nCoV)is not uncommon,due to the cost only small sample is employed to estimate a large number of variances(or their inverse)of variables simultane... Detecting differential expression of genes in genom research(e.g.,2019-nCoV)is not uncommon,due to the cost only small sample is employed to estimate a large number of variances(or their inverse)of variables simultaneously.However,the commonly used approaches perform unreliable.Borrowing information across different variables or priori information of variables,shrinkage estimation approaches are proposed and some optimal shrinkage estimators are obtained in the sense of asymptotic.In this paper,we focus on the setting of small sample and a likelihood-unbiased estimator for power of variances is given under the assumption that the variances are chi-squared distribution.Simulation reports show that the likelihood-unbiased estimators for variances and their inverse perform very well.In addition,application comparison and real data analysis indicate that the proposed estimator also works well. 展开更多
关键词 high-dimensional diagonal covariance matrix geometric shrinkage estimator small sample optimal shrinkage parameter likelihood-unbiased estimator hotelling’s T2test
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