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Listar por autor "Galbis Verdu, Antonio"

Mostrando ítems 1-14 de 14

Atomic decompositions and frames in Fréchet spaces and their duals

Ribera Puchades, Juan Miguel (Universitat Politècnica de València, 2015-05-11)

[EN] The Ph.D. Thesis "Atomic decompositions and frames in Fréchet spaces and their duals" presented here treats different areas of functional analysis with applications. Schauder frames are used to represent an arbitrary ...
Atrial fibrillation subtypes classification using the General Fourier-family Transform

Ortigosa, Nuria; Cano, O.; Ayala Gallego, Guillermo; Galbis Verdu, Antonio; Fernandez Rosell, Carmen (Elsevier, 2014-04)

Atrial fibrillation patients can be classified into paroxysmal, persistent and permanent attending to the temporal pattern of this arrhythmia. The surface electrocardiogram hides this differentiation. A classification ...
Composition operators on the Schwartz space

GALBIS VERDU, ANTONIO; Jorda Mora, Enrique (European Mathematical Society Publishing House, 2018)

[EN] We study composition operators on the Schwartz space of rapidly decreasing functions. We prove that such a composition operator is never a compact operator and we obtain necessary or sufficient conditions for the range ...
Dynamics and spectra of composition operators on the Schwartz space

FERNÁNDEZ ROSELL, CARMEN; GALBIS VERDU, ANTONIO; Jorda Mora, Enrique (Elsevier, 2018)

[EN] In this paper we study the dynamics of the composition operators defined in the Schwartz space of rapidly decreasing functions. We prove that such an operator is never supercyclic and, for monotonic symbols, it is ...
Early prediction of cardiac resynchronization therapy response by non-invasive electrocardiogram markers

Ortigosa, Nuria; Pérez-Roselló, Víctor; Donoso, Victor; Osca Asensi, Joaquín; Martínez-Dolz, Luis; Fernández Rosell, Carmen; Galbis Verdu, Antonio (Springer-Verlag, 2018-04)

[EN] Cardiac resynchronization therapy (CRT) is an effective treatment for those patients with severe heart failure. Regrettably, there are about one third of CRT "non-responders", i.e. patients who have undergone this ...
Frames and representing systems in Fréchet spaces and their duals

Bonet Solves, José Antonio; Fernandez Rosell, Carmen; Galbis Verdu, Antonio; Ribera Puchades, Juan Miguel (Duke University Press, 2017)

[EN] Frames and Bessel sequences in Fr\'echet spaces and their duals are defined and studied. Their relation with Schauder frames and representing systems is analyzed. The abstract results presented here, when applied to ...
Frames de Gabor: el principio de dualidad de Ron y Shen

Primo Tárraga, Eva (Universitat Politècnica de València, 2015-07-17)

[EN] We introduce the frame theory and the ir relationship with Riesz bases. We focus on the study of Gabor frames and conclude with the Ron-Shen duality principie
Gabor frames for classification of paroxysmal and persistent atrial fibrillation episodes

Ortigosa, Nuria; Galbis Verdu, Antonio; Fernández, Carmen; Cano-Pérez, Óscar (Elsevier, 2017-01)

[EN] In this study, we propose a new classification method for early differentiation of paroxysmal and persistent atrial fibrillation episodes, i.e. those which spontaneously or with external intervention will return to ...
Invariant subspaces of the integration operators on Hörmander algebras and Korenblum type spaces

Bonet Solves, José Antonio; Galbis, Antonio (Springer-Verlag, 2020-07-27)

[EN] We describe the proper closed invariant subspaces of the integration operator when it acts continuously on countable intersections and countable unions of weighted Banach spaces of holomorphic functions on the unit ...
Iterados de operadores diferenciales en clases no casi analíticas

Juan Huguet, Jordi (Universitat Politècnica de València, 2012-01-10)

En el contexto de las clases de funciones no casi analíticas de Braun, Meyse yTaylor, definimos espacios de funciones mediante los iterados de un operador en derivadas parcial lineales. Estudiamos la completidud de estos ...
Iterates of differential operators and vector valued functions on non quasi analytic classes

Juan Huguet, Jordi (Universitat Politècnica de València, 2011-02-04)

En el año 1960 Komatsu introdujo ciertas clases de funciones infinitamente derivables definidas mediante estimaciones del crecimiento de los sucesivos iterados de un operador en derivadas parciales cuando estudiaba propiedades ...
Operadores pseudodiferenciales en clases no cuasianalíticas de tipo Beurling

Jornet Casanova, David (Universitat Politècnica de València, 2015-09-22)

Los operadores pseudodiferenciales son generalizaciones de los operadores integrales singulares y de los operadores en derivadas parciales con coeficientes variables. A cada operador le corresponde un símbolo, que es una ...
Phase information of time-frequency transforms as a key feature for classification of atrial fibrillation episodes

Ortigosa, Nuria; Fernandez Rosell, Carmen; Galbis Verdu, Antonio; Cano-Pérez, Óscar (IOP Publishing, 2015-03)

[EN] Patients suffering from atrial fibrillation can be classified into different subtypes, according to the temporal pattern of the arrhythmia and its recurrence. Nowadays, clinicians cannot differentiate a priori between ...
Spectrum of composition operators on S(R) with polynomial symbols

Fernández, Carmen; Galbis, Antonio; Jorda Mora, Enrique (Elsevier, 2020-05-13)

[EN] We study the spectrum of operators in the Schwartz space of rapidly decreasing functions which associate each function with its composition with a polynomial. In the case where this operator is mean ergodic we prove ...