Greengard, Leslie; O Neil, Michael; Rachh, Manas; Vico Bondía, Felipe(Elsevier, 2021-03)
[EN] While fast multipole methods (FMMs) are in widespread use for the rapid evaluation of potential fields governed by the Laplace, Helmholtz, Maxwell or Stokes equations, their coupling to high-order quadratures for ...
Sherfey, Jason S.; Ardid-Ramírez, Joan Salvador; Hass, Joachim; Hasselmo, Michael E.; Kopell, Nancy J.(Public Library of Science, 2018-08-09)
[EN] Oscillations are ubiquitous features of brain dynamics that undergo task-related changes in synchrony, power, and frequency. The impact of those changes on target networks is poorly understood. In this work, we used ...
Climente Alarcón, Alfonso; Torrent Martí, Daniel; Sánchez-Dehesa Moreno-Cid, José(American Institute of Physics, 2014-08-11)
This work presents a method for the realization of gradient index devices for flexural waves in thin plates. Unlike recent approaches based on phononic crystals, the present approach is based on the thickness-dependence ...
Reyes Ayona, Edgar; Torrent Martí, Daniel; Sánchez-Dehesa Moreno-Cid, José(Acoustical Society of America, 2012-10)
A multiple-scattering theory is applied to study the homogenization of clusters of elastic cylinders distributed in a isotropic lattice and embedded in a viscous fluid. Asymptotic relations are derived and employed to ...
Optical forces allow manipulation of small particles and control of nanophotonic structures
with light beams. While some techniques rely on structured light to move particles using field intensity gradients, acting locally, ...
Anisotropic and inhomogeneous metamaterial shells are studied in order to exploit all their resonant mode richness. These multilayer structures are based on a cylindrical distribution of radially dependent constitutive ...
Anisotropic characteristics of cylindrically corrugated microstructures are analyzed in terms of their acoustic and electromagnetic (EM) behavior paying special attention to their differences and similarities. A simple ...
A multiple scattering formulation of two-dimensional (2D) acoustic metamaterials is presented. This approach is comprehensive and can lead to frequency-dependent effective parameters (scalar bulk modulus and tensorial mass ...
We report the design and the characterization of artificial structures made of periodical distributions of structured cylindrical scatterers embedded in a two-dimensional (2D) waveguide. For certain values of their geometrical ...
This Letter reports the design, fabrication, and experimental characterization of hyperbolic materials showing negative refraction and energy funneling of airborne sound. Negative refraction is demonstrated using a stack ...
Climente Alarcón, Alfonso; Torrent Martí, Daniel; Sánchez-Dehesa Moreno-Cid, José(American Institute of Physics, 2012-04-06)
We present the design, construction, and experimental characterization of the acoustic analogue of the so called photonic black-hole. The fabricated sample has cylindrical symmetry and consists of two parts, a shell that ...
Climente Alarcón, Alfonso; Torrent Martí, Daniel; Sánchez-Dehesa Moreno-Cid, José(American Institute of Physics (AIP), 2013)
This work presents a gradient index device for insulating from vibrations a circular area of a thin plate. The gradient of the refractive index is achieved exploiting the thickness-dependence of the dispersion relation of ...
[EN] This paper presents a trajectory planning approach in multirobot systems based on Petri net models. This type of models is very useful for high-level specifications since, in this case, the classical planning methods ...
Sherfey, Jason; Ardid-Ramírez, Joan Salvador; Miller, Earl K.; Hasselmo, Michael E.; Kopell, Nancy J.(Elsevier, 2020-09)
[EN] Cognition involves using attended information, maintained in working memory (WM), to guide action. During a cognitive task, a correct response requires flexible, selective gating so that only the appropriate information ...
[EN] We present a framework suited to the analysis of cryptographic protocols that make use of time in their execution. We provide
a process algebra syntax that makes time information available to processes, and a transition ...
García Chocano, Víctor Manuel; Graciá Salgado, Rogelio; Torrent Martí, Daniel; Cervera Moreno, Francisco Salvador; Sánchez-Dehesa Moreno-Cid, José(American Physical Society, 2012-05-14)
We present the experimental realization and characterization of an acoustic metamaterial with negative bulk modulus. The metamaterial consists of a two-dimensional array of cylindrical cavities, and the bulk modulus is ...
Based on the concepts of artificially microstructured materials, i.e. metamaterials, we present here the first practical realization of a radial wave crystal. This type of device was introduced as a theoretical proposal ...
García Chocano, Víctor Manuel; Torrent Martí, Daniel; Sánchez-Dehesa Moreno-Cid, José(American Institute of Physics, 2012-08-22)
This letter presents the design of a reduced acoustic cloak that uses a temperature gradient in order to obtain sound speeds larger than in air. The cloak consists of a circular acoustic crystal made of ten concentric ...
García Chocano, Víctor Manuel; Nagaraj; López-Rios Fernández, Tomás; Gumen, Lyudmila; Sánchez-Dehesa Moreno-Cid, José; Krokhin, Arkadii(Acoustical Society of America, 2012-10)
Coupling of Rayleigh waves propagating along two metal surfaces separated by a narrow fluid channel is predicted and experimentally observed. Although the coupling through a fluid (water) is weak, a strong synchronization ...
Climente Alarcón, Alfonso; Norris, A.N.; Sánchez-Dehesa Moreno-Cid, José(Acoustical Society of America, 2015-01)
The scattering of flexural waves by a hole in a thin plate traversed by a beam is modeled here by coupling the Kirchhoff Love and the Euler Bernoulli theories. A closed form expression is obtained for the transfer matrix ...