Results 71 to 80 of about 808,768 (351)
Fifty years of eigenvalue perturbation theory
, 1991 We highlight progres in the study of eigenvalue perturbation theory, especially problems connected to quantum mechanics. Six models are discussed in detail: isoelectronic atoms, autoionizing states, the anharmonic oscillator, double wells, and the Zeeman
B. Simon
semanticscholar +1 more source
Topological Singularities and Edge‐State Coupling Enable Robust on‐Chip Slow Light
Advanced Science, EarlyView.This work demonstrates the first experimental observation of a topological quantum‐interference‐like effect in a 1D on‐chip system, utilizing two topological mechanisms for robust slow light. Topological charges ensure immunity to parameter deviations, while edge states provide robustness against disturbances.
Yuqian Wang +6 more
wiley +1 more source
Advanced Electronic Materials, EarlyView.The BiSbF2 monolayer is a 2D topological insulator with a large bandgap (252 meV) hosting topological edge states and giant valley‐contrasted spin‐splitting (478 meV). The sizable gap enables room‐temperature quantum spin Hall effects, while its coexisting topological and valleytronic features provide a versatile platform for exploring topological ...
Bin Geng +4 more
wiley +1 more source
Analysis of Semi-Blind Channel Estimation in Multiuser Massive MIMO Systems With Perturbations
IEEE Access, 2019 In the massive multiple-input multiple-output (MIMO) systems, pilot contamination and signal perturbation are two important issues in the semi-blind channel estimation methods.
Cheng Hu, Hong Wang, Rongfang Song
doaj +1 more source
An Approach of Eigenvalue Perturbation Theory
, 2005 This paper presents an approach of eigenvalue perturbation theory, which frequently arises in engineering and physical science. In particular, the problem of interest is an eigenvalue problem of the form (A + eB)φ(e) = λ(e)φ(e) where A and B are n × n ...
K. Ngo
semanticscholar +1 more source
Aggregate, EarlyView.This study developed a rapid, in situ, and derivatization‐free detection system for 3‐MCPD in paper‐based food contact materials, based on molecular imprinting and quartz crystal microbalance sensing technologies, achieving a detection limit of 0.006 µM and reducing analysis time by 75% compared to traditional methods.
Jinwei Zhao +10 more
wiley +1 more source
Eigenvalue perturbation models for robust control
IEEE Transactions on Automatic Control, 1995 This paper presents a nonconservative description of the regions containing the eigenvalues of a diagonal matrix, perturbed by the set of all unknown, Euclidean norm bounded matrices. This is extended to real valued block diagonal matrices where each two-
Roy S. Smith
semanticscholar +1 more source
Model‐based fault diagnosis in closed‐loop safety‐critical chemical reactors: An experimental study
AIChE Journal, EarlyView.Abstract This experimental study investigates fault detection and estimation in a continuous stirred‐tank reactor (CSTR) system under closed‐loop feedback control, including an analysis of different manipulative inputs for temperature regulation. A novel fault diagnosis approach is proposed, combining residual signal analysis and T2 statistic for real ...
Pu Du, Benjamin Wilhite, Costas Kravaris
wiley +1 more source
Signatures of three coalescing eigenfunctions
, 2011 Parameter dependent non-Hermitian quantum systems typically not only possess eigenvalue degeneracies, but also degeneracies of the corresponding eigenfunctions at exceptional points.
Demange, Gilles, Graefe, Eva-Maria
core +2 more sources
Eigenvalues of perturbed Hermitian matrices
Linear Algebra and its Applications, 1974 AbstractIt is a common experience that the perturbation, or even the omission, of some elements of a matrix often has negligible effect on some of the eigenvalues of the whole matrix. Here some new theorems are presented on this isolation effect in Hermitian matrices.
openaire +2 more sources