Seismic metamaterials have been the subject of much recent interest, with notable conceptual advances and the demonstration of possible full-scale effectiveness in earthquake protection. Here, through a fine analysis of the dispersion properties and behavior of resonators introduced in a laboratory scale setup, we propose a strategy for the design ...
Due to a too sparse permanent seismic coverage during the last decades, the crustal structure of western France and the surrounding regions is poorly known. In this study, we present a 3-D seismic tomographic model of this area obtained from the analysis of 2-yr continuous data recorded from 55 broad-band seismometers. An unconventional approach is...
Monitoring the small variations of a medium is increasingly important in subsurface geophysics due to climate change. Classical seismic surface wave dispersion methods are limited to quantitative estimations of these small variations when the variation ratio is smaller than 10 per cent, especially in the case of variations in deep media. Based on t...
The first meters of the underground media, the Critical Zone, involve many human activities. It is also the site of disturbances due to climate change through variations in the level of the water table, hydric and mechanical modifications that increase erosion and the risks of damage or even collapse. Therefore, monitoring of the subsurface and its...
Metasurfaces are used to design mantle cloaks based on scattering cancellation which involves surface impedance analysis. Theory of characteristic modes is a good tool for analyzing the scattering of a metallic object because it is based on the surface impedance and brings physical insight into the scattering properties of a structure independently...
International Workshop on Antenna Technology (iWAT), Bucarest, ROUMANIE, 25-/02/2020 - 28/02/2020
Metasurfaces are used to design mantle cloaks based on scattering cancellation which involves surface impedance analysis. Theory of characteristic modes is a good tool for analyzing the scattering of a metallic object because it is based on the surface impedance and brings physical insight into the scattering properties of a structure independently...
A numerical model is proposed to compute the eigenmodes and the forcedresponse of multilayered elastic spheres. The main idea is to describe analyti-cally the problem along the angular coordinates with spherical harmonics andto discretize the radial direction with one-dimensional finite elements. Theproper test function must be carefully chosen so ...
Les premiers mètres du sous-sol, la Zone Critique, concentrent de nombreuses activités humaines. La ZC est aussi le siège de perturbations en raison du changement climatique à travers des variations du niveau des nappes, de modifications hydriques et mécaniques qui augmentent l'érosion et les risques de dommages voire d'effondrements. Aussi, la sur...
Although a rigorous theoretical ground on metasurfaces has been established in the recent years on the basis of the equivalence principle, the majority of metasurfaces for converting a propagating wave into a surface wave are developed in accordance with the so-called generalized Snell's law being a simple heuristic rule for performing wave transfo...
