Gotowa bibliografia na temat „Equation des ondes harmoniques”
Utwórz poprawne odniesienie w stylach APA, MLA, Chicago, Harvard i wielu innych
Zobacz listy aktualnych artykułów, książek, rozpraw, streszczeń i innych źródeł naukowych na temat „Equation des ondes harmoniques”.
Przycisk „Dodaj do bibliografii” jest dostępny obok każdej pracy w bibliografii. Użyj go – a my automatycznie utworzymy odniesienie bibliograficzne do wybranej pracy w stylu cytowania, którego potrzebujesz: APA, MLA, Harvard, Chicago, Vancouver itp.
Możesz również pobrać pełny tekst publikacji naukowej w formacie „.pdf” i przeczytać adnotację do pracy online, jeśli odpowiednie parametry są dostępne w metadanych.
Artykuły w czasopismach na temat "Equation des ondes harmoniques"
Lardet-Vieudrin, Franck, Serge Dos Santos i Michel Planat. "Blocage par injection de modes sous- harmoniques d’un oscillateur utilisant une ligne à retard à ondes de surface". Annales Des Télécommunications 51, nr 7-8 (lipiec 1996): 330–34. http://dx.doi.org/10.1007/bf02996020.
Pełny tekst źródłaYoussef, Mejri. "Inverse Problem: Stability for the aligned magnetic field by the Dirichlet-to-Neumann map for the wave equation in a periodic quantum waveguide". Revue Africaine de la Recherche en Informatique et Mathématiques Appliquées Volume 23 - 2016 - Special... (13.12.2016). http://dx.doi.org/10.46298/arima.1509.
Pełny tekst źródłaBjørnestad, Maria, Henrik Kalisch, Malek Abid, Christian Kharif i Mats Brun. "Wave Breaking in Undular Bores with Shear Flows". Water Waves, 6.01.2021. http://dx.doi.org/10.1007/s42286-020-00046-6.
Pełny tekst źródłaRouchon, Pierre. "Quantum systems and control 1". Revue Africaine de la Recherche en Informatique et Mathématiques Appliquées Volume 9, 2007 Conference in... (22.09.2008). http://dx.doi.org/10.46298/arima.1904.
Pełny tekst źródłaRozprawy doktorskie na temat "Equation des ondes harmoniques"
Ponomarev, Dmitry. "Quelques problèmes inverses avec des données partielles". Thesis, Nice, 2016. http://www.theses.fr/2016NICE4027/document.
Pełny tekst źródłaThe thesis consists of three parts. In Part I, we consider partially overdeterminedboundary-value problemS for Laplace PDE in a planar simply connected domain withLipschitz boundary. Assuming Dirichlet and Neumann data available on its part to be realvaluedfunctions of certain regularity, we develop a non-iterative method for solving thisill-posed Cauchy problem choosing as a regularizing parameter L2 bound of the solutionon complementary part of the boundary. The present complex-analytic approach alsonaturally allows imposing additional pointwise constraints on the solution which, onpractical side, can help incorporating outlying boundary measurements without changingthe boundary into a less regular one. Part II is concerned with spectral structure of atruncated Poisson operator arising in various physical applications. We deduce importantproperties of solutions, discuss connections with other problems and pursue differentreductions of the formulation for large and small values of asymptotic parameter yieldingsolutions by means of solving simpler integral equations and ODEs. In Part III, we dealwith a particular inverse problem arising in real physical experiments performed withSQUID microscope. The goal is to recover certain magnetization features of a sample frompartial measurements of one component of magnetic field above it. We develop newmethods based on Kelvin and Fourier transformations resulting in estimates of netmoment components
Ha, Duong Tuong. "Equations intégrales pour la résolution numérique de problèmes de diffraction d'ondes acoustiques dans R**(3)". Paris 6, 1987. http://www.theses.fr/1987PA066420.
Pełny tekst źródłaCaudron, Boris. "Couplages FEM-BEM faibles et optimisés pour des problèmes de diffraction harmoniques en acoustique et en électromagnétisme". Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0062/document.
Pełny tekst źródłaIn this doctoral dissertation, we propose new methods for solving acoustic and electromagnetic three-dimensional harmonic scattering problems for which the scatterer is penetrable and inhomogeneous. The resolution of such problems is key in the computation of sonar and radar cross sections (SCS and RCS). However, this task is known to be difficult because it requires discretizing partial differential equations set in an exterior domain. Being unbounded, this domain cannot be meshed thus hindering a volume finite element resolution. There are two standard approaches to overcome this difficulty. The first one consists in truncating the exterior domain and renders possible a volume finite element resolution. Given that they approximate the scattering problems at the continuous level, truncation methods may however not be accurate enough for SCS and RCS computations. Inhomogeneous penetrable harmonic scattering problems can also be solved by coupling a volume variational formulation associated with the scatterer and surface integral equations related to the exterior domain. This approach is known as FEM-BEM coupling (Finite Element Method-Boundary Element Method). It is of great interest because it is exact at the continuous level. Classical FEM-BEM couplings are qualified as strong because they couple the volume variational formulation and the surface integral equations within one unique formulation. They are however not suited for solving high-frequency problems. To remedy this drawback, other FEM-BEM couplings, said to be weak, have been proposed. These couplings are actually domain decomposition algorithms iterating between the scatterer and the exterior domain. In this thesis, we introduce new acoustic and electromagnetic weak FEM-BEM couplings based on recently developed Padé approximations of Dirichlet-to-Neumann and Magnetic-to-Electric operators. The number of iterations required to solve these couplings is only slightly dependent on the frequency and the mesh refinement. The weak FEM-BEM couplings that we propose are therefore suited to accurate SCS and RCS computations at high frequencies
Amenoagbadji, Pierre. "Wave propagation in quasi-periodic media". Electronic Thesis or Diss., Institut polytechnique de Paris, 2023. http://www.theses.fr/2023IPPAE020.
Pełny tekst źródłaThe goal of this thesis is to develop efficient numerical methods for the solution of the time-harmonic wave equation in quasiperiodic media, in the spirit of methods previously developed for periodic media. The goal is to use as in quasiperiodic homogenization the idea that an elliptic PDE with quasiperiodic coefficients can be interpreted as the cut of a higher-dimensional PDE which is elliptically degenerate, but with periodic coefficients. The periodicity property allows to use adapted tools, but the non-elliptic aspect makes the mathematical and numerical analysis of the PDE delicate. One application concerns transmission problems between periodic half-spaces (typically photonic crystals) when (1) the interface does not cut the periodic half-spaces in a direction of periodicity, or (2) when the periodic media have noncommensurate periods along the interface
Faucher, Florian. "Contributions à l'imagerie sismique par inversion des formes d’onde pour les équations d'onde harmoniques : Estimation de stabilité, analyse de convergence, expériences numériques avec algorithmes d'optimisation à grande échelle". Thesis, Pau, 2017. http://www.theses.fr/2017PAUU3024/document.
Pełny tekst źródłaIn this project, we investigate the recovery of subsurface Earth parameters. Weconsider the seismic imaging as a large scale iterative minimization problem, anddeploy the Full Waveform Inversion (FWI) method, for which several aspects mustbe treated. The reconstruction is based on the wave equations because thecharacteristics of the measurements indicate the nature of the medium in whichthe waves propagate. First, the natural heterogeneity and anisotropy of the Earthrequire numerical methods that are adapted and efficient to solve the wavepropagation problem. In this study, we have decided to work with the harmonicformulation, i.e., in the frequency domain. Therefore, we detail the mathematicalequations involved and the numerical discretization used to solve the waveequations in large scale situations.The inverse problem is then established in order to frame the seismic imaging. Itis a nonlinear and ill-posed inverse problem by nature, due to the limitedavailable data, and the complexity of the subsurface characterization. However,we obtain a conditional Lipschitz-type stability in the case of piecewise constantmodel representation. We derive the lower and upper bound for the underlyingstability constant, which allows us to quantify the stability with frequency andscale. It is of great use for the underlying optimization algorithm involved to solvethe seismic problem. We review the foundations of iterative optimizationtechniques and provide the different methods that we have used in this project.The Newton method, due to the numerical cost of inverting the Hessian, may notalways be accessible. We propose some comparisons to identify the benefits ofusing the Hessian, in order to study what would be an appropriate procedureregarding the accuracy and time. We study the convergence of the iterativeminimization method, depending on different aspects such as the geometry ofthe subsurface, the frequency, and the parametrization. In particular, we quantifythe frequency progression, from the point of view of optimization, by showinghow the size of the basin of attraction evolves with frequency. Following the convergence and stability analysis of the problem, the iterativeminimization algorithm is conducted via a multi-level scheme where frequencyand scale progress simultaneously. We perform a collection of experiments,including acoustic and elastic media, in two and three dimensions. Theperspectives of attenuation and anisotropic reconstructions are also introduced.Finally, we study the case of Cauchy data, motivated by the dual sensors devicesthat are developed in the geophysical industry. We derive a novel cost function,which arises from the stability analysis of the problem. It allows elegantperspectives where no prior information on the acquisition set is required
Gaudron, Renaud. "Réponse acoustique de flammes prémélangées soumises à des ondes sonores harmoniques". Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLC073/document.
Pełny tekst źródłaThermoacoustic instabilities, also known as combustion instabilities, are a major concern in the aerospace and energy production industries. They are due to an energy transfer that occurs between a heat source, usually a flame stabilized inside a combustor, and the surrounding acoustic field and may lead to undesirable phenomena such as flame extinction, increased heat fluxes, very large sound emissions at certain frequencies, vibration, structural damage and even catastrophic failure in some cases. Given the potential consequences of such phenomena, a large research effort has been devoted to predicting the onset of combustion instabilities in modern boilers, rocket engines and gas turbines during the past few decades. Unfortunately, the theoretical framework associated with the study of thermoacoustic instabilities is complex and multi-physics and the geometry of practical combustors is an intricate arrangement of 3D cavities. As a consequence, predicting the thermoacoustic stability of a combustor at an early design stage is a challenging task to date... (See inside the manuscript for the remainder of the abstract)
Goulet, Pierre. "Contribution à l'étude des molécules à symétrie C4v, à l'aide de la spectroscopie hertzienne". Dijon, 1990. http://www.theses.fr/1990DIJOS022.
Pełny tekst źródłaPeynaud, Emilie. "Rayonnement sonore dans un écoulement subsonique complexe en régime harmonique : analyse et simulation numérique du couplage entre les phénomènes acoustiques et hydrodynamiques". Thesis, Toulouse, INSA, 2013. http://www.theses.fr/2013ISAT0019/document.
Pełny tekst źródłaThis thesis deals with the numerical simulation of time harmonic acoustic propagation in an arbitrary mean flow in an unbounded domain. Our approach is based on an equation equivalent to the linearized Euler equations called the Galbrun equation. It is derived from a mixed Eulerian-Lagrangian formulation and results in a single equation whose only unknown is the perturbation of the Lagrangian displacement. A direct solution using finite elements is unstable but this difficulty can be overcome by using an augmented equation which is constructed by adding a new unknown, the vorticity, defined as the curl of the displacement. This leads to a set of equations coupling a wave like equation with a time harmonic transport equation which allows the use of perfectly matched layers (PML) at artificial boundaries to bound the computational domain. The first part of the thesis is a study of the time harmonic transport equation and its approximation by means of a discontinuous Galerkin scheme, the difficulties coming from the oscillating behaviour of its solutions. Once these difficulties have been overcome, it is possible to deal with the resolution of the acoustic propagation problem. The approximation method is based on a mixed continuous-Galerkin and discontinuous-Galerkin finite element scheme. The well-posedness of both the continuous and discrete problems is established and the convergence of the approximation under some mean flow conditions is proved. Finally a numerical implementation is achieved and numerical results are given which confirm the validity of the method and also show that it is relevant in complex cases, even for unstable flows
Stutzmann, Eléonore. "Tomographie du manteau a partir des modes harmoniques des ondes de surface". Paris 7, 1993. http://www.theses.fr/1993PA077102.
Pełny tekst źródłaGuyétand, Olivier. "Photoionisation simple et double à deux couleurs d'atomes de gaz rares". Paris 11, 2008. http://www.theses.fr/2008PA112327.
Pełny tekst źródłaThe present work deals with simple and double ionization of rare gases by harmonic radiation produced by, and combined with, an intense femtosecond infrared laser. Technical aspects related to the use of harmonic generation and to the detection of ions and electrons in coincidence are exposed. Theoretical backgroung for two colour, few photon, single and double ionization is detailed. Spectra and angular distributions of the photoelectrons measured in helium are described and compared with TDSE theoretical calculations, for various conditions of the harmonic photons. The shape of the angular distributions can be explained within the frame of two distinct analytic approaches : the perturbation theory and the soft-photon approximation. The double ionization measurements have been performed on xenon, a complex atom characterized by many possible routes leading to double ionization. The analysis of energy and angular correlations of the two photoelectrons proves the feasibility of such experiments, which combine harmonic and infrared radiations. It shows that two step processes are dominant in the case of xenon. This work appeals for extending few photon, double ionization experiments to lighter rare gases
Książki na temat "Equation des ondes harmoniques"
R, Watson N., red. Power system harmonics. Wyd. 2. West Sussex, England: J. Wiley & Sons, 2003.
Znajdź pełny tekst źródłaA, Bradley D., i Bodger P. S, red. Power system harmonics. Chichester [West Sussex]: Wiley, 1985.
Znajdź pełny tekst źródłaBurgers-KPZ turbulence: Göttingen lectures. Berlin: Springer, 1998.
Znajdź pełny tekst źródłaChew, Weng, Mei Song Tong i Bin hu. Integral Equation Methods for Electromagnetic and Elastic Waves. Morgan & Claypool Publishers, 2008.
Znajdź pełny tekst źródłaHU, Bin, Weng Chew i Mei Song Tong. Integral Equation Methods for Electromagnetic and Elastic Waves. Springer International Publishing AG, 2008.
Znajdź pełny tekst źródłaVolkov, Evgenii A. Block Method for Solving the Laplace Equation and for Constructing Conformal Mappings. Taylor & Francis Group, 2017.
Znajdź pełny tekst źródłaVolkov, Evgenii A. Block Method for Solving the Laplace Equation and for Constructing Conformal Mappings. Taylor & Francis Group, 2017.
Znajdź pełny tekst źródłaVolkov, Evgenii A. Block Method for Solving the Laplace Equation and for Constructing Conformal Mappings. Taylor & Francis Group, 2017.
Znajdź pełny tekst źródłaBlock Method for Solving the Laplace Equation and for Constructing Conformal Mappings. Taylor & Francis Group, 2017.
Znajdź pełny tekst źródła(Editor), Constantine Balanis, red. Recent Advances in Integral Equation Solvers in Electromagnetics (Synthesis Lectures on Computational Electromagnetics). Morgan & Claypool, 2007.
Znajdź pełny tekst źródłaCzęści książek na temat "Equation des ondes harmoniques"
Lebeau, G. "Equation des Ondes Amorties". W Algebraic and Geometric Methods in Mathematical Physics, 73–109. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-017-0693-3_4.
Pełny tekst źródła