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Wyszukujesz frazę "Espinosa, V." wg kryterium: Wszystkie pola


Wyświetlanie 1-3 z 3
Tytuł:
Temperature effects on the parametric generation in a water-filled acoustical resonator
Autorzy:
Pérez-Arjona, I.
Cebrecos, A.
Sánchez-Morciillo, V. J.
Espinosa, V.
Powiązania:
https://bibliotekanauki.pl/articles/332260.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Akustyczne
Opis:
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 effect of the unavoidable rising of the temperature due to the acoustic wave. Two main new features under these considerations can be observed. On one hand, the fundamental field does not achieve a saturating value when subharmonics fields appear, but still grows with the driving. On the other hand, the subharmonics fields can exist only for a limited range of driving value, due to the dependence of the cavity resonances with the temperature of the medium. The experimental setup was designed and we show here the experimental measurements, which are in good agreement with the predicted values for the mode amplitudes and the parametric threshold.
Źródło:
Hydroacoustics; 2013, 16; 197-202
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Subdiffractive propagation in a bidimensional sonic crystal
Autorzy:
Sanchez-Morcillo, V.
Perez-Arjona, I.
Redondo, J.
Espinosa, V.
Staliunas, K.
Powiązania:
https://bibliotekanauki.pl/articles/332514.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Akustyczne
Opis:
Sonic crystals are media with a periodic modulation of the acoustic parameters, as the density and the bulk modulus. They have recently attracted a great interest, because of their potential applications in the control of sound propagation, used as reflectors, focusers or waveguides. All these properties are related with the dispersion introduced by the crystal anisotropy. We report on the nondiffractive propagation of sound in two-dimensional sonic crystals. It is shown that, for given frequencies and directions of incidence, a narrow sonic beam can propagate without diffractive broadening. Such nondiffractive sonic beams exist in crystals with perfect symmetry, and do not require the presence of defects, differently from other waveguiding phenomena reported previously. The cancellation of diffraction has been predicted using the plane-wave expansion method to evaluate the dispersion surfaces of the crystal and the spatial dispersion (isofrequency) curves. It occurs for frequencies and wavevectors for which dispersion curves have zero curvature, denoting a transition between focusing and defocusing regimes. By means of perturbative techniques, a simple analytical expression for the nondiffractive conditions has been obtained. The phenomenon is also demonstrated by numerical integration of the acoustic equations using the FDTD technique with very good agreement with the preliminary experimental results. Support from Spanish MEC, project FIS2005-07931-C03-01, is acknowledged.
Źródło:
Hydroacoustics; 2007, 10; 85-92
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relative infaunal bivalve density assessed from split beam echosounder angular information
Autorzy:
Sanchez-Carnero, N.
Rodriguez-Perez, D.
Zaragoza, N.
Espinosa, V.
Freire, J.
Powiązania:
https://bibliotekanauki.pl/articles/48622.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
shellfish
bivalve
textural feature
stock assessment
acoustic technique
split-beam echosounder
mapping
monitoring
Źródło:
Oceanologia; 2014, 56, 3
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
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