Results 61 to 70 of about 130,152 (295)
Teoría de perturbaciones de Brillouin-Wigner: Oscilador armónico perturbado
Momento, 1993 An harmonic oscillator is subject to a perturbation [Physical Formula] where [Physical Formula] is an eigenket of the momentum operator. The Brillouin-Wigner perturbation theory is applied to solve the eigenvalue equation of the perturbed Hamiltonian.
D. Campos
doaj
International Islamic University Malaysia Engineering Journal, 2013 : In this article, methods of theory of bifurcations, applies to the problem of retaining of the approximately given multiple eigenvalues and their generalized eigenvectors.
Rakhimov Davran Ganievich
doaj +1 more source
Floating Phase in 1D Transverse ANNNI Model
, 2006 To study the ground state of ANNNI chain under transverse field as a function of frustration parameter $\kappa$ and field strength $\Gamma$, we present here two different perturbative analyses. In one, we consider the (known) ground state at $\kappa=0.5$
Anjan Kumar Chandra +5 more
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An Approach of Eigenvalue Perturbation Theory [PDF]
Applied Numerical Analysis & Computational Mathematics, 2005 The eigenvalue problem of the form \((A+\varepsilon B)\phi(\varepsilon)= \lambda(\varepsilon) \phi(\varepsilon)\) is considered, where \(A, B\) are matrices, or more generally, differential operators. If \(A\) is selfadjoint and the eigenvalue \(\lambda(0)\) of \(A\) is simple, it is shown that \(\lambda(\varepsilon)\) has a power series expansion ...
openaire +3 more sources
Advanced Optical Materials, EarlyView.The nanoparticle‐on‐slit (NPoS) cavity has emerged as a sub‐wavelength platform for efficient coherent frequency conversion between mid‐infrared and visible light, and for nanoscale nonlinear vibrational spectroscopy. This numerical study identifies the NPoS quasi‐normal modes, relates them to known nanogap patterns, and predicts the relative ...
Huatian Hu +3 more
wiley +1 more source
Perturbing eigenvalues of nonnegative matrices
Linear Algebra and its Applications, 2016 Let $A$ be an irreducible (entrywise) nonnegative $n\times n$ matrix with eigenvalues $$ , b+ic,b-ic, _4,\cdots, _n,$$ where $ $ is the Perron eigenvalue. It is shown that for any $t \in [0, \infty)$ there is a nonnegative matrix with eigenvalues $$ + \tilde t, _2+t, _3+t, _4 \cdots, _n,$$ whenever $\tilde t \ge _n t$ with $ _3=1, _4 ...
Xuefeng Wang +2 more
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Non‐Hermitian Topological Lattice Photonics: An Analytic Perspective
Advanced Photonics Research, EarlyView.This review establishes exact analytical solutions for non‐Hermitian Hatano–Nelson, Su–Schrieffer–Heeger, and generalized Rice–Mele models. We demonstrate non‐Hermitian skin effects via point‐gap topology, hybrid skin‐topological edge states in 2D lattices, and spin‐polarized boundary modes governed by dual bulk‐boundary correspondence.
Shihua Chen +6 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
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Wilson chiral perturbation theory, Wilson-Dirac operator eigenvalues and clover improvement [PDF]
, 2013 Chiral perturbation theory for eigenvalue distributions, and equivalently random matrix theory, has recently been extended to include lattice effects for Wilson fermions.
Damgaard, Poul H. +2 more
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A novel iterative method to approximate structured singular values
, 2016 A novel method for approximating structured singular values (also known as mu-values) is proposed and investigated. These quantities constitute an important tool in the stability analysis of uncertain linear control systems as well as in structured ...
Guglielmi, Nicola +2 more
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