A5076536124- Underwater Acoustics Research
- Seismic Imaging and Inversion Techniques
- Geophysical Methods and Applications
- Marine animal studies overview
- Seismic Waves and Analysis
- Numerical methods in inverse problems
- Digital Transformation in Industry
- Ultrasonics and Acoustic Wave Propagation
- Microwave Imaging and Scattering Analysis
- Meteorological Phenomena and Simulations
- Acoustic Wave Phenomena Research
- Simulation Techniques and Applications
- Advanced Battery Technologies Research
- Stability and Controllability of Differential Equations
- Animal Vocal Communication and Behavior
- Advanced Mathematical Modeling in Engineering
- Numerical methods for differential equations
- Agriculture and Rural Development Research
- Transgenic Plants and Applications
- Maritime and Coastal Archaeology
- Scientific Computing and Data Management
- Flexible and Reconfigurable Manufacturing Systems
- Plant tissue culture and regeneration
- Scientific Research and Discoveries
- Computational Fluid Dynamics and Aerodynamics
Laboratoire Amiénois de Mathématique Fondamentale et Appliquée
2007-2024
Université de Picardie Jules Verne
2008-2024
Centre National de la Recherche Scientifique
2007-2024
University of Tennessee at Knoxville
2018
Royal Netherlands Academy of Arts and Sciences
2017
MathWorks (United States)
2016
Apple (United States)
2016
École nationale des ponts et chaussées
2016
Centre d'Enseignement et de Recherche en Environnement Atmosphérique
2016
Université Grenoble Alpes
2016
The statistical properties of acoustic signals reflected by a randomly layered medium are analyzed when pulsed spherical wave issuing from point source is incident upon it. asymptotic analysis stochastic equations and geometrical acoustics used to arrive at set transport that characterize multiply scattered observed the surface medium. results extensive numerical simulations presented, illustrating scope theory. A number inverse problems for media also formulated where we recover large-scale...
Over the past four years, Big Data and Exascale Computing (BDEC) project organized a series of five international workshops that aimed to explore ways in which new forms data-centric discovery introduced by ongoing revolution high-end data analysis (HDA) might be integrated with established, simulation-centric paradigm high-performance computing (HPC) community. Based on those meetings, we argue rapid proliferation digital generators, unprecedented growth volume diversity they generate,...
The use of the desirability function approach combined with response surface methodology (RSM), also called Desirability Optimization Methodology (DOM), has been successfully applied to solve medical, chemical, and technological questions. It is particularly efficient for determination optimal conditions in natural or industrial processes involving different factors leading antagonist responses.Surprisingly, DOM never research programs devoted study plant responses complex environmental...
Electrode wetting is a critical step in the Lithium-Ion Battery manufacturing process. The injection of electrolyte electrodes' porosity requires application pressure-vacuum pumping strategies without warranty that full will be fully occupied with at end this process step. electrode wettability strongly depends on contact angle between and electrode, microstructure characterized by its porosity, pore network tortuosity factor, viscosity density. Computational fluid dynamics approaches such...
Traditionally, optimization in biological analyses has been carried out by monitoring the influence of one factor at a time; this technique is called one-variable-at-a-time. The disadvantage that it does not include any interactive effects among variables studied and requires large number experiments. Therefore, recent years, Response Surface Methodology (RSM) become most popular method. It an effective mathematical statistical which widely used studies with minimal experimental trials where...
The numerical simulation of acoustic waves in complex three-dimensional (3D) media is a key topic many branches science, from exploration geophysics to non-destructive testing and medical imaging. With the drastic increase computing capabilities this field has dramatically grown last 20 years. However 3D computations, especially at high frequency and/or long range, are still far beyond current reach force researchers resort approximations, for example, by working two dimensions (plane...
The spectrum of the damped wave operator for a bounded domain in R 2 is shown to be related asymptotic average damping function by geodesic flow. This allows calculation an expression distribution imaginary parts eigenvalues radially symmetric geometry. Numerical simulations confirm theoretical model. In addition, we are able exhibit beautiful structure and close links between eigenfunctions, raysof geometrical optics, geometry region. MATLAB code used this paper provided.
This essentially numerical study, sets out to investigate various geometrical properties of exact boundary controllability the wave equation when control is applied on a part boundary. Relationships between geometry domain, controlled boundary, time needed and energy are dealt with. A new norm an energetic cost factor introduced. These quantities enable detailed appraisal solutions obtained detection trapped rays.
Recently the concept of adjoint modeling has been introduced in shallow water acoustics for solving inverse problems. Analytical adjoints have derived normal modes and both standard parabolic equation Claerbout’s wide-angle approximation (WAPE). This paper proposes application a semiautomatic approach that successfully applied past multidimensional variational data assimilation meteorological climate modeling. Starting from modular graph representation underlying forward model, programming...
We consider for the wave equation inverse problem of identifying locations point sources and dipoles from limited-view data. Using as weights particular background solutions constructed by geometrical control method, we recover classical imaging algorithms appropriately averaging show both analytically numerically that if one can accurately construct geometric control, then perform with same resolution when using data full-view
In accordance with the increasing industrial interests in sea areas a two-pronged development can be observed: an appearance of new methodologies for up-to-date and cost effective management protection these cultural environmental resources which is underpinned by parallel legislative framework. For submerged heritage UNESCO's Convention on Protection Underwater Cultural Heritage (UNESCO 2001) forms important part this administrative development. The method acoustic detection Stone Age sites...
The inversion of broad-band low-frequency acoustic signals received on sparse arrays can lead to robust and efficient estimations sea-bed properties. This paper describes a shallow-water geoacoustic scheme based the use model-based matched-impulse response single hydrophone. Results from INTIMATE'96 experiment Portuguese shelf break are reviewed. In order minimize effects strong time variability due internal tides, only time-stable waterborne bottom-surface reflected arrivals exploited. A...
Inverse problems in ocean acoustics are generally solved by means of matched-field inversion combination with meta-heuristic global search algorithms. Recently adjoint-based optimal nonlocal boundary control has been proposed as a possible complement or alternative to the traditional geoacoustic methods. Especially for assessment shallow water environment where field data recorded on non-fully populated hydrophone arrays there is an inherent need observation over broad range frequencies,...
The diffraction and absorption of waves by a system with both absorbing properties irregular geometry is an open physical problem. A more reachable closely related question the understanding wave oscillations in confined systems containing material shape. This has to be solved understand why anechoic chambers (electromagnetic or acoustic) do work better walls. answer this could also used other fields such as light microwave absorption, improve performances break-waters order damp sea-waves....
Pulsed sounds are an interesting example of complex biological sounds, frequent in cetaceans' vocalizations. A two-group classification these is proposed: tonal or non-tonal. Through two simple mathematical models, it shown that this can lead to better techniques for measuring the pulse rate. This thus useful improving measurement accuracy, but also help formulating hypotheses regarding mechanisms sound production. method applied south Pacific blue whale vocalizations and found rate...