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Listar por palabra clave "Spectrum"

Mostrando ítems 1-20 de 47

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5G Spectrum: enabling the future mobile landscape

Schotten, Hans D.; Uusitalo, Mikko A.; Monserrat del Río, José Francisco; Queseth, Olav (Institute of Electrical and Electronics Engineers (IEEE), 2015-07)

The arrival of the fifth generation (5G) is expected to come together with three important enablers. First, the densification of access nodes will continue. Second, 5G networks must be highly flexible and adapt to the ...
A Note on the Spectrum of Composition Operators on Spaces of Real Analytic Functions

Bonet Solves, José Antonio; DOMANSKI, PAWEL (Springer-Verlag, 2017-01)

[EN] In this paper the spectrum of composition operators on the space of real analytic functions is investigated. In some cases it is completely determined while in some other cases it is only estimated.
A Note on the Spectrum of Some Composition Operators on Korenblum Type Spaces

Galindo, Pablo; Gomez-Orts, Esther (Springer-Verlag, 2021-05)

[EN] We prove that under some mild conditions on the symbol phi, the spectrum of the corresponding composition operator C-phi on the Korenblum type spaces A_(-alpha) and A(+)(-alpha) contains a closed ball of positive radius.
Abel's Functional Equation and Eigenvalues of Composition Operators on Spaces of Real Analytic Functions

Bonet Solves, José Antonio; Domanski, Pawel (Springer Verlag (Germany), 2015-04)

We obtain full description of eigenvalues and eigenvectors of composition operators Cϕ : A (R) → A (R) for a real analytic self map ϕ : R → R as well as an isomorphic description of corresponding eigenspaces. We completely ...
Acoustics for Musicians: Sounds & Spectra

Nuño Fernández, Luis (Universitat Politècnica de València, 2018-06-25)

The sound of a musical instrument can be represented either in time domain (envelope, waveform) or in frequency domain (spectrum, harmonics). The variation of the spectrum is analysed as a function of the sound length, the ...
Algorithms for solving the inverse problem associated with KAK = A(s+1)

Lebtahi Ep-Kadi-Hahifi, Leila; Romero Martínez, José Oscar; Thome Coppo, Néstor Javier (Elsevier, 2017)

[EN] In previous papers, the authors introduced and characterized a class of matrices called {K, s+1}-potent. Also, they established a method to construct these matrices. The purpose of this paper is to solve the associated ...
Anomalous Raman modes in tellurides

Manjón, Francisco-Javier; Gallego-Parra, Samuel; Rodríguez Hernández, Plácida; Muñoz, Alfonso; Drasar, Cestmir; Muñoz-Sanjosé, Vicente; Oeckler, Oliver (The Royal Society of Chemistry, 2021-05-21)

[EN] Two anomalous broad bands are usually found in the Raman spectrum of bulk and 2D Te-based chalcogenides, which include binary compounds, like ZnTe, CdTe, HgTe, GaTe, GeTe, SnTe, PbTe, GeTe2, As2Te3, Sb2Te3, Bi2Te3, ...
Aplicación de espectroscopia de infrarrojo cercano para identificar adulteraciones de cacao con harina de algarroba

Renuncio Gabarda, Laura (Universitat Politècnica de València, 2017-09-15)

[ES] El cacao ha incrementado su precio en el mercado en los últimos años. Por este motivo, se sospecha que determinados comerciantes de cacao podrían estar adulterando el cacao en polvo con otros ingredientes más baratos. ...
Broadcast television spectrum incentive auctions in the U.S.: trends, challenges, and opportunities

Gómez Barquero, David; Caldwell, M. Winston (Institute of Electrical and Electronics Engineers (IEEE), 2015-07)

This article presents an overview of the upcoming television broadcast spectrum incentive auction in the U.S., which will be the first ever attempted worldwide, and discusses the main business, regulatory, and technical ...
Characterizations of {K,s+1}-Potent Matrices and Applications

Lebtahi Ep-Kadi-Hahifi, Leila; Romero Martínez, José Oscar; Thome, Néstor (Elsevier, 2012-01-15)

Recently, situations where a matrix coincides with some of its powers have been studied. This kind of matrices is related to the generalized inverse matrices. On the other hand, it is possible to introduce another class ...
Cluster values for algebras of analytic functions

Carando, Daniel; Galicer, Daniel; Muro, Santiago; Sevilla Peris, Pablo (Elsevier, 2018-04)

[EN] The Cluster Value Theorem is known for being a weak version of the classical Corona Theorem. Given a Banach space X, we study the Cluster Value Problem for the ball algebra A(u)(B-X), the Banach algebra of all uniformly ...
Convergence of arithmetic means of operators in Fréchet spaces

Albanese, Angela Ama; Bonet Solves, José Antonio; Ricker, Werner J. (Elsevier, 2013-05-01)

Every Köthe echelon Fréchet space XX that is Montel and not isomorphic to a countable product of copies of the scalar field admits a power bounded continuous linear operator TT such that I−TI−T does not have closed range, ...
Corrigendum to Cluster values for algebras of analytic functions

Carando, Daniel; Galicer, Daniel; Muro, Santiago; Sevilla Peris, Pablo (Elsevier, 2018-04)

[EN] While the article was in publication process, we found a mistake in a key tool for the proof one of the main results. As a consequence, our result on the ball A(u)(B-X) algebra remains open. For the algebra H-b(X) we ...
DROA. Daily Routine Organizer for Autistic children

Martínez Herrera, Caridad Marina (Universitat Politècnica de València, 2020-07-31)

[EN] ASD or Autism spectrum disorder is a set of developmental disorders that today affects 1 in 100 births in Europe and 1 in 88 in the USA . It is said spectrum because there is a great variety in the level of affectation ...
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 ...
Dynamics and spectrum of the Cesàro operator on C-infinity(R+)

Albanese, Angela A.; Bonet Solves, José Antonio; Ricker, Werner J. (Springer-Verlag, 2016)

[EN] The spectrum and point spectrum of the Cesaro averaging operator C acting on the Frechet space C-infinity(R+) of all C-infinity functions on the interval [0, infinity) are determined. We employ an approach via ...
El fenómeno del metamerismo en la digitalización de las obras de arte

Silva Fino, Michel; Contell Villagrasa, Teresa (Editorial Universitat Politècnica de València, 2022-10-25)

[EN] Metamerism is a problem suffered by specialists in the field of photography and graphic arts. This phenomenon causes two colors that are different cannot be correctly distinguished, could be for various reasons, ...
Energy-efficient resource allocation model for device-to-device communication in 5G wireless personal area networks

Jaganathan Logeshwaran; Shanmugasundaram, Nallasamy; Lloret, Jaime (John Wiley & Sons, 2023-09-10)

[EN] In general, there are several many devices that can overload the network and reduce performance. Devices can minimize interference and optimize bandwidth usage by using directional antennas and by avoiding overlapping ...
Experiments with Harmonics

Nuño Fernández, Luis (Universitat Politècnica de València, 2019-06-18)

Three different signals are analyzed, one electronic with complex tones, and two real, piano and violin. In each case, the first 3 harmonics are played separately, then the group of first harmonics having greater strength, ...
Function lattices and compactifications

Alaste, Tomi Matias (Editorial Universitat Politècnica de València, 2014-10-01)

[EN] Let F be a lattice of real-valued functions on a non-empty set X such that F contains the constant functions. Using certain filters on X determined by F, we construct a compact Hausdorff topological space δX with the ...