Simultaneous self-collimation of sound beams with different frequencies, corresponding to fundamental wave and to its second harmonic, is proposed theoretically and demonstrated experimentally. The result is obtained when ...
We propose and numerically demonstrate the feasibility of spatial filtering, i.e. a selective removal of the high spatial frequency components, of narrow acoustic beams during their propagation along a two- dimensional ...
De Valcarcel Gonzalvo, German Jose; Garcia-Ferrer, F. V.; Hoppner, R. M.; Pérez Arjona, Isabel; Navarrete-Benlloch, C.; Roldan, E.(Society of Photo-optical Instrumentation Engineers (SPIE), 2010)
[EN] In the last years we have proposed the use of the mechanism of spontaneous symmetry breaking with the purpose of generating perfect quadrature squeezing. Here we review previous work dealing with spatial (translational ...
[EN] Target strength (TS) measurements for ventral aspect of gilthead sea bream (Sparus aurata) have been performed in a scaled aquaculture cage. The measurements have been made with a Simrad EK-60 scientific echososunder ...
Boyra, G .; Moreno, G.; Sobradillo, B.; Pérez Arjona, Isabel; Sancristóbal, I.; Demer, David(Oxford University Press, 2018)
[EN] This paper presents measures of target strength (TS; dB re 1 m(2)) and models of TS vs. fork length (L; cm), i.e. TS = 20log(L) + b(20), for skip-jack tuna associated with fish aggregating devices (FADs) in the Central ...
We consider the problem of parametric sound generation in an acoustic interferometer
containing a fluid. We have taken explicitly into account both the influence of the nonlinearly
generated second harmonic and the ...
Remiro Gargallo, Andrea Vicenta(Universitat Politècnica de València, 2019-10-16)
[ES] Como bien indica unas de las características más importantes y nos concierne
a la mayoría de nosotros dentro de la aplicación de la propagación acústica en
el marco de la estrategia marina (MSFD), es que el medio ...
[EN] Anthropogenic activities are causing increased noise levels in the marine environment. To date, few studies have been undertaken to investigate the effects of different noise frequencies on the behaviour of juvenile ...
Ladino-Velásquez, Anderson; Puig Pons, Vicente; Espinosa Roselló, Víctor; Pérez Arjona, Isabel; De la Gandara García, Fernando; Ortega, A.(Elsevier, 2022)
[EN] Swimbladder inflation is a significant matter in intensive fish farming, since it is related to larval survival rate and the morphological quality of individuals. In this work, we propose a non-invasive acoustic ...
Ordoñez Cebrián, Patricia(Universitat Politècnica de València, 2017-09-01)
In recent decades, acoustic techniques have become the most appropriate tools for biomass estimation in the fishing industry. This is because acoustic waves are the only waves that can be used for remote sensing in the ...
[EN] Posidonia oceanica meadows are ecosystem engineers that play several roles in marine environment maintenance. In this sense, monitoring of the spatial distribution and health status of their meadows is key to make ...
Sevillano Fernández-Freire, Sara(Universitat Politècnica de València, 2020-07-20)
El objetivo de este proyecto es la visualización y medida de pulsos
ultrasónicos mediante una técnica de visualización de flujos. En concreto la
técnica de campo oscuro denominada técnica de Schlieren. Este método ...