[EN] A new open, thin and low frequency acoustic barrier is presented. These barriers, based on arrays of isolated pickets produce high acoustic attenuation in a selective range of frequencies related to their geometry and ...
[EN] The Talbot effect using ultrasonic waves transmitted through a periodic perforated plate is presented. The ultrasonic wave-field at the exit of the perforated plate replicates the perforated pattern at the Talbot ...
[EN] In many engineering degrees courses, Physics is a fundamental pillar from which the rest of the subjects of the degree are formed. This fundamental nature is perceived by students as subjects with no connection to the ...
[EN] This paper presents an overview of the recents studies on the ultrasonic transmission through subwavelength holes arrays. The role of the geometrical parameters of the perforated plates in the transmission features ...
En este objeto de aprendizaje se muestra el proceso de descarga un condensador a través de una resistencia en serie con una autoinducción. Las magnitudes eléctricas evolucionan en el tiempo oscilando de manera subamortiguada, ...
[EN] The focusing capabilities of a pinhole zone plate lens are presented and compared with those
of a conventional Fresnel zone plate lens. The focusing properties are examined both experimentally
and numerically. The ...
[EN] Rice (Oryza sativa L.) is a staple cereal in the diet of more than half of the world's population. Within the European Union, Spain is a leader in rice production due to its climate and tradition, accounting for 26% ...
Tarrazó-Serrano, Daniel; Rubio Michavila, Constanza; Minin, O. V.; Uris Martínez, Antonio; Minin, I. V.(Springer, 2020-10)
[EN] The ability of focus waves with concave or convex surfaces is well known both in optics and in acoustics. Nowadays, the possibility of beamforming sound with flat lenses is a hot topic because of its application in ...
[EN] The capability of focusing of a novel acoustic lens based on a mesoscale acoustic cuboid particle filled with CO2 gas is analysed. This flat lens is able to focus sound in the same way that conventional curved acoustic ...
Estrada, Héctor; Candelas Valiente, Pilar; Uris Martínez, Antonio; Belmar Ibáñez, Francisco; Meseguer Rico, Francisco Javier; García de Abajo, F. Javier(Elsevier, 2011-04)
We present, a model to calculate sound transmission through plates perforated with periodically distributed subwavelength holes. Measurements performed using aluminium-perforated plates immersed in water are compared to ...
Theoretical results on sound transmission through plates perforated with compound periodic hole arrays are presented. Calculations are obtained by means of a model under the rigid-solid assumption, which is thoroughly ...
[EN] Reduction of noise in the transmission path is a very important environmental problem. The standard method to reduce this noise level is the use of acoustic barriers. In this paper, an acoustic metamaterial based on ...
Rubio Michavila, Constanza; Minin, Igor V.; Minin, Oleg V.; Uris Martínez, Antonio(Acoustical Society of America, 2019-09-06)
We predict acoustic super resonance modes with a field-intensity enhancement several tens of thousands
of times higher (order of magnitude: 104 -10 5) with the support of dielectric mesoscale spheres submerged
in water, ...
[EN] Sustainable Development Goals (SDGs) currently represent a challenge for the future and are already being implemented in different working areas. That is why, from the moment a student starts university education, ...
[EN] In this paper we present a new way to obtain tunable acoustic hooks. The breaking of the symmetry of the material composition is used for the generation of acoustic hooks from Janus cylinders. This fact is possible ...
[EN] In this paper, we demonstrate that, contrary to what the Geometrical Optics laws dictate, a flat polymer mesoscale cuboid immersed in water with no need of negative refraction can focus sound. Two main polymers ...
The lensing capabilities of a single subwavelength slit surrounded by a finite array of grooves milled into a brass plate is presented. The modulation of the beam intensity of this ultrasonic lens can be adjusted by varying ...
The ultrasonic transmission through plates perforated with 2 x 2 or 3 x 3 square array of subwavelength holes per unit cell are studied by numerical simulations. Calculations are obtained by means of a theoretical model ...
Estrada Beltrán, Héctor Andrés(Universitat Politècnica de València, 2011-12-23)
Las estructuras periódicas macroscópicas han sido objeto de una intensa investigación durante las dos últimas décadas debido a su capacidad de imitar fenómenos ondulatorios que son inherentes a la escala atómica. Aunque ...
[EN] One of the most important purposes when designing an ultrasonic lens, focuses on improving targeting
the waves. On the other hand, it is well known the great scientific interest in structures that follow
fractal ...