Results 31 to 40 of about 8,079,144 (302)

Active and Reactive Power Control for Wind Turbines Based DFIG Using LQR Controller with Optimal Gain-Scheduling

open access: yesJournal of Electrical and Computer Engineering, 2021
This paper proposes an optimal gain-scheduling for linear quadratic regulator (LQR) control framework to improve the performance of wind turbines based Doubly Fed Induction Generator (DFIG).
Ashraf Radaideh   +2 more
doaj   +1 more source

Support Vector Machines in R [PDF]

open access: yes, 2005
Being among the most popular and efficient classification and regression methods currently available, implementations of support vector machines exist in almost every popular programming language.
Kurt Hornik   +5 more
core   +1 more source

New Exploration of Phase Portrait Classification of Quadratic Polynomial Differential Systems Based on Invariant Theory

open access: yesAppliedMath
After linear differential systems in the plane, the easiest systems are quadratic polynomial differential systems in the plane. Due to their nonlinearity and their many applications, these systems have been studied by many authors.
Joan Carles Artés   +2 more
doaj   +1 more source

Heterotic Kerr-Schild Double Field Theory and its double Yang-Mills formulation

open access: yesJournal of High Energy Physics, 2022
We present a formulation of heterotic Double Field Theory (DFT), where the fundamental fields are in O(D, D) representations. The theory is obtained splitting an O(D, D + K ) duality invariant DFT.
Eric Lescano, Sourav Roychowdhury
doaj   +1 more source

A note on quadratic performance of a class of switched uncertain nonlinear systems

open access: yesSystems Science & Control Engineering
We 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

kernlab - An S4 package for kernel methods in R [PDF]

open access: yes, 2004
kernlab is an extensible package for kernel-based machine learning methods in R. It takes advantage of R's new S4 object model and provides a framework for creating and using kernel-based algorithms. The package contains dot product primitives (kernels),
Zeileis, Achim   +10 more
core   +1 more source

Periodic perturbations of quadratic planar polynomial vector fields [PDF]

open access: yesAnais 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

Nilpotent Center in a Continuous Piecewise Quadratic Polynomial Hamiltonian Vector Field

open access: yesInternational 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   +3 more sources

Convex Optimization for Array Diagnosis Using Amplitude-Only Far Field Data in Impulsive Noise Environment

open access: yesIEEE 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

open access: yesPhysics 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

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