Results 31 to 40 of about 375,845 (279)

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

Journal 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, Mu’men Bodoor, Ayman Al-Quraan   +2 more
doaj   +1 more source

Relating pseudospin and spin symmetries through charge conjugation and chiral transformations: the case of the relativistic harmonic oscillator [PDF]

, 2006
We solve the generalized relativistic harmonic oscillator in 1+1 dimensions, i.e., including a linear pseudoscalar potential and quadratic scalar and vector potentials which have equal or opposite signs.
A. S. de Castro, B. Thaller, C. Itzykson, D. Itô, I. N. Bronshtein, L. I. Schiff, M. Abramowitz, M. Malheiro, P. Alberto, P. Strange, R. Lisboa, Y. Nogami   +11 more
core   +2 more sources

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

Journal 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

The mixed functors of the category Fquad: a first study [PDF]

, 2006
In previous work, we defined the category of functors Fquad, associated to vector spaces over the field with two elements equipped with a nondegenerate quadratic form.
Bourbaki, Bénabou, Christine Vespa, Franjou, Pfister, Schwartz   +5 more
core   +2 more sources

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

AppliedMath
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, Laurent Cairó, Jaume Llibre   +2 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

Inflation in a self-interacting gas universe [PDF]

, 1998
We show that a de Sitter spacetime is a solution of Einstein's field equations with the energy momentum tensor of a self-interacting, classical Maxwell-Boltzmann gas in collisional equilibrium.
Balakin, Alexander B., Zimdahl, Winfried
core   +2 more sources

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

Systems 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, Guisheng Zhai, Ziyi He, Bo Fu   +3 more
doaj   +1 more source

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

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, Wenjing Wang, Yang Zhang, Weirong Sun   +3 more
doaj   +1 more source

Vector Field and Inflation

, 2009
We have investigated if the vector field can give rise to an accelerating phase in the early universe. We consider a timelike vector field with a general quadratic kinetic term in order to preserve an isotropic background spacetime.
Golovnev A., Kanno S.
core   +1 more source