Results 31 to 40 of about 23,170 (262)
Quadratic Morse-Smale Vector Fields which are not Structurally Stable [PDF]
Proceedings of the American Mathematical Society, 1982 An example is given of a quadratic system in the plane which is Morse-Smale but not structurally stable. Also, it is proved that no such example exists for a quadratic system which is a gradient.
Chicone, Carmen, Shafer, Douglas S.
openaire +1 more source
A note on quadratic performance of a class of switched uncertain nonlinear systems
Systems Science & Control EngineeringWe address quadratic performance, specifically quadratic stabilization and [Formula: see text] gain for a class of switched systems consisting of uncertain nonlinear subsystems.
Yufang Chang +3 more
doaj +1 more source
Nilpotent Center in a Continuous Piecewise Quadratic Polynomial Hamiltonian Vector Field
International Journal of Bifurcation and Chaos, 2022 In this paper, we study the global dynamics of continuous piecewise quadratic Hamiltonian systems separated by the straight line [Formula: see text], where these kinds of systems have a nilpotent center at [Formula: see text], which comes from the combination of two cusps of both Hamiltonian systems.
Chen, Ting, Llibre, Jaume
openaire +2 more sources
IEEE Access, 2019 In this paper, an array diagnosis method using amplitude-only far-field data in impulsive noise environment is proposed. For amplitude-only far-field data, the power of the observed field is quadratic with respect to array excitation, which leads to a ...
Ying Zhang +3 more
doaj +1 more source
One-loop radiative corrections in bumblebee-Stueckelberg model
Physics Letters B, 2023 This work aims to study the radiative corrections in a vector model with spontaneous Lorentz symmetry violation, known in the literature as the bumblebee model.
Fernando M. Belchior, Roberto V. Maluf
doaj +1 more source
Periodic perturbations of quadratic planar polynomial vector fields [PDF]
Anais da Academia Brasileira de Ciências, 2002 In this work are studied periodic perturbations, depending on two parameters, of quadratic planar polynomial vector fields having an infinite heteroclinic cycle, which is an unbounded solution joining two saddle points at infinity. The global study envolving infinity is performed via the Poincaré compactification.
openaire +6 more sources
Quadratic Discriminant Analysis of Spatially Correlated Data
Nonlinear Analysis, 2001 The problem of classification of the realisation of the stationary univariate Gaussian random field into one of two populations with different means and different factorised covariance matrices is considered. In such a case optimal classification rule in
K. Dučinskas, J. Šaltytė
doaj +1 more source
Generalized spinning particles on $${\mathcal {S}}^2$$ S 2 in accord with the Bianchi classification
European Physical Journal C: Particles and Fields, 2021 Motivated by recent studies of superconformal mechanics extended by spin degrees of freedom, we construct minimally superintegrable models of generalized spinning particles on $${\mathcal {S}}^2$$ S 2 , the internal degrees of freedom of which are ...
Anton Galajinsky
doaj +1 more source
Phase Field Failure Modeling: Brittle‐Ductile Dual‐Phase Microstructures under Compressive Loading
Advanced Engineering Materials, EarlyView.The approach by Amor and the approach by Miehe and Zhang for asymmetric damage behavior in the phase field method for fracture are compared regarding their fitness for microcrack‐based failure modeling. The comparison is performed for the case of a dual‐phase microstructure with a brittle and a ductile constituent.
Jakob Huber, Jan Torgersen, Ewald Werner
wiley +1 more source
An Extended Newmark-FDTD Method for Complex Dispersive Media
International Journal of Antennas and Propagation, 2018 Based on polarizability in the form of a complex quadratic rational function, a novel finite-difference time-domain (FDTD) approach combined with the Newmark algorithm is presented for dealing with a complex dispersive medium.
Yu-Qiang Zhang, Peng-Ju Yang
doaj +1 more source