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Browsing by Subject "Scattering"

Now showing items 1-20 of 26

A Model for the gamma p --> pi+ pi- p Reaction

Gómez-Tejedor, José-Antonio; Oset, E. (Elsevier, 1994-05-09)

[EN] We have studied the gammap--> pi+ pi- p reaction using a model which includes N, DELTA(1232), N*(1440) and N*(1520) intermediate baryonic states and the rho-meson as intermediate 2pi-resonance. The model reproduces ...
Acoustic transparency in two-dimensional sonic crystals

Sánchez-Dehesa Moreno-Cid, José; Torrent, Daniel; Cai, Liang - Wu (IOP Publishing: Open Access Journals, 2009-01-23)

Acoustic transparency is studied in two-dimensional sonic crystals consisting of hexagonal distributions of cylinders with continuously varying properties. The transparency condition is achieved by selectively closing the ...
All-Silicon spherical-Mie-resonator photodiode with spectral response in the infrared region

Garín Escrivá, Moisés; Fenollosa Esteve, Roberto; Alcubilla, Ramón; Shi, Lei; Marsal, L. F.; Meseguer Rico, Francisco Javier (Nature Publishing Group, 2014-03)

[EN] Silicon is the material of choice for visible light photodetection and solar cell fabrication. However, due to the intrinsic band gap properties of silicon, most infrared photons are energetically useless. Here, we ...
An algorithm for the reconstruction of high-energy neutrino-induced particle showers and its application to the ANTARES neutrino telescope

Ardid Ramírez, Miguel; Felis-Enguix, Iván; Martínez Mora, Juan Antonio; Saldaña-Coscollar, María; Albert, A.; Andre, M.; Anghinolfi, M.; Anton, G.; Aubert, J. -J.; Avgitas, T.; Baret, B.; Barrios-Martí, J.; Basa, S.; Bertin, V.; Biagi, S. (Springer, 2017-06-21)

A novel algorithm to reconstruct neutrino-induced particle showers within the ANTARES neutrino telescope is presented. The method achieves a median angular resolution of 6º, for shower energies below 100 TeV. Applying this ...
Analytical model to predict the effect of a finite impedance surface on the propagation properties of 2D Sonic Crystals

Romero García, Vicente; Sánchez Pérez, Juan Vicente; García Raffi, Luis Miguel (IOP Publishing: Hybrid Open Access, 2011)

The use of sonic crystals (SCs) as environmental noise barriers has certain advantages from both the acoustical and the constructive points of view with regard to conventional ones. However, the interaction between the SCs ...
Análisis numérico mediante elementos finitos de la dispersión acústica producida por cuerpos elásticos de dimensiones finitas

González Salido, Nuria (Universitat Politècnica de València, 2012-02-17)

El estudio numérico de la dispersión de ondas planas de sonido por diferentes geometrías finitas es presentado. La información contenida en los ecos (amplitud y fase) permite caracterizar ciertas propiedades de los dispersores ...
Anisotropic mass density by two-dimensional acoustic metamaterials

Torrent Martí, Daniel; Sánchez-Dehesa Moreno-Cid, José (IOP Publishing: Open Access Journals, 2008-02-06)

We show that specially designed two-dimensional arrangements of full elastic cylinders embedded in a nonviscous fluid or gas define ( in the homogenization limit) a new class of acoustic metamaterials characterized by a ...
Brillouin Microwave Filter with enhanced Skirt Selectivity using a Birefringent Fiber

Samaniego, Diego; Vidal Rodriguez, Borja (Institute of Electrical and Electronics Engineers, 2019-03-15)

[EN] A technique to enhance the slope of a photonic microwave filter based on the stimulated Brillouin scattering is proposed. It relies on exploiting the polarization dependence of Brillouin gain in birefringent fibers. ...
Broadband true time delay for microwave signal processing, using slow light based on stimulated Brillouin scattering in optical fibers

Chin, Sanghoon; Thevenaz, Luc; Sancho Durá, Juan; Sales Maicas, Salvador; Capmany Francoy, José; Berger, Perrine; Bourderionnet, Jerome; Dolfi, Daniel (Optical Society of America: Open Access Journals, 2010-10-11)

[EN] We experimentally demonstrate a novel technique to process broadband microwave signals, using all-optically tunable true time delay in optical fibers. The configuration to achieve true time delay basically consists ...
Contribution to the modelling of the light field distribution within Synechocystis sp. PCC 6803 cultures and its influence on cellular photosynthesis processes

Fuente Herraiz, David (Universitat Politècnica de València, 2019-06-28)

La presente tesis doctoral, titulada "Contribution to the modelling of the light field distribution within Synechocystis sp. PCC 6803 cultures and its influence on cellular photosynthesis processes", engloba diversos ...
High-pressure lattice dynamics in wurtzite and rocksalt indium nitride investigated by means of Raman spectroscopy

Ibánez, J.; Oliva, R.; Manjón Herrera, Francisco Javier; Segura, A.; Yamaguchi, T.; Nanishi, Y.; Cuscó, R.; Artús, L. (American Physical Society, 2013-09-05)

We present an experimental and theoretical lattice-dynamical study of InN at high hydrostatic pressures. We perform Raman scattering measurements on five InN epilayers, with different residual strain and free electron ...
High-pressure theoretical and experimental study of HgWO4

Lopez-Solano, J.; Rodriguez-Hernandez, Plácida; Muñoz, A.; Santamaria-Perez, David; Manjón Herrera, Francisco Javier; Ray, S.; Gomis Hilario, Oscar; Mollar García, Miguel Alfonso; Panchal, V.; Errandonea, Daniel (Taylor & Francis, 2011-03)

HgWO 4 at ambient pressure is characterized using a combination of ab initio calculations, X-ray diffraction and Raman scattering measurements. The effect of low pressure and temperature on the structural stability is ...
Influence of the scattering and absorption coefficients on homogeneous room simulations that use a diffusion equation model

Navarro Ruiz, Juan Miguel; Escolano Carrasco, José; Cobos Serrano, Máximo; López Monfort, José Javier (Acoustical Society of America, 2013-03)

The diffusion equation model was used for room acoustic simulations to predict the sound pressure level and the reverberation time. The technical literature states that the diffusion equation method accurately models the ...
Introducción a las radiocomunicaciones. Reflexión, refracción y fenómenos de scattering

Despujol Zabala, Ignacio (Universitat Politècnica de València, 2019-06-18)

Se describen la reflexión, la refracción y los fenómenos de scattering
La medida de color en alimentos translucidos

Talens Oliag, Pau (Universitat Politècnica de València, 2016-07-28)

Cuando la luz índice sobre un alimento opaco, la porción de luz que no es absorbida es reflejada por el producto con mayor o menor intensidad dependiendo de la naturaleza del alimento y de la estructura de la superficie. ...
Letter of interest for a neutrino beam from Protvino to KM3NeT/ORCA

Akindinov, A.V.; Anassontzis, E.G.; Anton, G.; Ardid Ramírez, Miguel; Aublin, J.; Baret, B.; Bertin, V.; Bourret, S.; Bozza, C.; Bruchner, M.; Bruijn, R.; Brunner, J.; Chabab, M.; Chau, N.; Chepurnov, A.S.; Poirè, Chiara (Springer-Verlag, 2019-09)

[EN] The Protvino accelerator facility located in the Moscow region, Russia, is in a good position to offer a rich experimental research program in the field of neutrino physics. Of particular interest is the possibility ...
Measurements with cylinders

Páez Rodríguez, Jorge (Universitat Politècnica de València, 2014-03-11)

Scattering of sound from cylinders of various materials and lengths is an important issue, although it has been investigated for decades,some measurements has discovered that some modes of propagation hasn't been described ...
Metadiffusers: Deep-subwavelength sound diffusers

Jimenez, Noe; Cox, Trevor J.; Romero García, Vicente; Groby, J.P. (Nature Publishing Group, 2017-07-14)

[EN] We present deep-subwavelength diffusing surfaces based on acoustic metamaterials, namely metadiffusers. These sound diffusers are rigidly backed slotted panels, with each slit being loaded by an array of Helmholtz ...
Photonic Microwave Filter With Steep Skirt Selectivity Based on Stimulated Brillouin Scattering

Samaniego-Riera, Diego; Vidal Rodriguez, Borja (Institute of Electrical and Electronics Engineers (IEEE), 2016-12)

A method to enhance the filter slope of Brillouin-based photonic microwave filters is presented. This improvement is achieved by the combination of Brillouin gain and loss responses over phase-modulated signals. The ...
Propiedades de dispersión de luz por partículas irregulares: una aplicación al estudio de las partículas cometarias

Vilaplana Cerda, Rosario Isabel (Universitat Politècnica de València, 2008-05-06)

Esta tesis está enfocada a la obtención de las propiedades de scattering de una distribución de partículas no esféricas y a su aplicación a las observaciones astronómicas, en longitudes de onda del dominio visible, del ...