Results 31 to 40 of about 568 (104)

Stochastic COVID‐19 epidemic model incorporating asymptomatic and isolated compartments

Mathematical Methods in the Applied Sciences, Volume 48, Issue 7, Page 8400-8422, 15 May 2025.
This study delves into the intricate dynamics of the COVID‐19 epidemic by extending a deterministic compartmental model incorporating asymptomatic, quarantined and isolated compartments, with a stochastic model capturing the natural randomness of the processes.
Tomás Caraballo, Ibrahim Bouzalmat, Adel Settati, Aadil Lahrouz, Abdeladim Nait Brahim, Bilal Harchaoui   +5 more
wiley   +1 more source

Control Multivariable Centralizado con Desacoplo para Aerogeneradores de Velocidad Variable

Revista Iberoamericana de Automática e Informática Industrial RIAI, 2010
Resumen: El diseño de sistemas de control para aerogeneradores de velocidad variable representa un reto importante ya que se trata de procesos multivariables no lineales, con fuertes perturbaciones, diversas restricciones y gran interacción entre sus ...
Miguel E. González, Francisco Vázquez, Fernando Morilla   +2 more
doaj   +1 more source

Impact of deep or ovarian endometriosis on pelvic pain and quality of life: prospective cross‐sectional ultrasound study

Ultrasound in Obstetrics &Gynecology, Volume 65, Issue 3, Page 372-383, March 2025.
ABSTRACT Objective To assess whether premenopausal women diagnosed with deep or ovarian endometriosis on transvaginal sonography (TVS) were more likely to suffer from dyspareunia and pelvic pain symptoms, and have a lower quality of life, compared to women without sonographically diagnosed deep or ovarian endometriosis.
P. Chaggar, T. Tellum, N. Thanatsis, L. V. de Braud, T. Setty, D. Jurkovic   +5 more
wiley   +1 more source

The assembly and dynamics of ecological communities in an ever‐changing world

Ecological Monographs, Volume 94, Issue 4, November 2024.
Abstract Alternative perspectives on the maintenance of biodiversity and the assembly of ecological communities suggest that both processes cannot be investigated simultaneously. In this concept and synthesis, we challenge this view by presenting major theoretical advances in structural stability and permanence theory.
Oscar Godoy, Fernando Soler‐Toscano, José R. Portillo, José A. Langa   +3 more
wiley   +1 more source

Dirichlet problems with skew-symmetric drift terms

Comptes Rendus. Mathématique
We prove existence of finite energy solutions for a linear Dirichlet problem with a drift and a convection term of the form $A\,E(x)\nabla u + \mathrm{div}(u\,E(x))$, with $A > 0$ and $E$ in $(L^{r}(\Omega ))^{N}$.
Boccardo, Lucio, Casado-Diaz, Juan, Orsina, Luigi   +2 more
doaj   +1 more source

Attractors for non-autonomous retarded lattice dynamical systems

Nonautonomous Dynamical Systems, 2015
In this paperwe study a non-autonomous lattice dynamical system with delay. Under rather general growth and dissipative conditions on the nonlinear term,we define a non-autonomous dynamical system and prove the existence of a pullback attractor for such ...
Caraballo Tomás, Morillas Francisco, Valero José   +2 more
doaj   +1 more source

Alan Turing y los orígenes de la eliminación gaussiana moderna

Arbor: Ciencia, Pensamiento y Cultura, 2013
La resolución de sistemas de ecuaciones lineales es sin duda el problema más importante en Matemática Aplicada. Es importante en sí mismo y también porque es un paso intermedio en la resolución de muchos otros problemas de gran relevancia. La eliminación
Froilán M. Dopico
doaj   +1 more source

Optimal Control of Insect Populations

Mathematics, 2021
We consider some optimal control problems for systems governed by linear parabolic PDEs with local controls that can move along the domain region Ω of the plane. We prove the existence of optimal paths and also deduce the first order necessary optimality
Anderson L. Albuquerque de Araujo, José L. Boldrini, Roberto C. Cabrales, Enrique Fernández-Cara, Milton L. Oliveira   +4 more
doaj   +1 more source

A New Method for the Exact Controllability of Linear Parabolic Equations

Mathematics
This work solves the exact controllability to zero in the final time for a linear parabolic problem when the control only acts in a part of the spatial domain. Specifically, it is proved, by compactness arguments, the existence of a partially distributed
Inmaculada Gayte Delgado, Irene Marín-Gayte   +1 more
doaj   +1 more source

Software Tutorial de apoyo al aprendizaje de los métodos básicos de Análisis Numérico para la solución de problemas de ingeniería

Publicaciones e Investigación, 2007
The software Numericals is a tutorial for support to the learning of the techniques used for the Numerical Analysis mediates the programming of the main numerical methods, for the solution of engineering problems.
Jesús Alfonso Torres Ortega
doaj   +1 more source