Дисертації з теми "Helmholtz Model"
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Scheiman, Kevin S. "A Parallel Spectral Method Approach to Model Plasma Instabilities." Wright State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=wright1527424992108785.
Повний текст джерелаLiu, Bing. "Properties Model for Aqueous Sodium Chloride Solutions near the Critical Point of Water." Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd1034.pdf.
Повний текст джерелаGernert, Georg Johannes [Verfasser], Roland [Gutachter] Span, and Eckhard [Gutachter] Weidner. "A new Helmholtz energy model for humid gases and CCS mixtures / Georg Johannes Gernert ; Gutachter: Roland Span, Eckhard Weidner ; Fakultät für Maschinenbau." Bochum : Ruhr-Universität Bochum, 2013. http://d-nb.info/1212661400/34.
Повний текст джерелаVölker, Doris [Verfasser]. "Chemical-sensitive genes in zebrafish (Danio rerio) early development - identification and characterisation of differential expression in embryos exposed to the model compound 3,4-dichloroaniline / Doris Völker. [Helmholtz Centre for Environmental Research, UFZ]." Leipzig : Helmholtz Centre for Environmental Research, 2007. http://d-nb.info/1007282541/34.
Повний текст джерелаSargent, Cristina Vasilica. "Trapped modes of the Helmholtz equation." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/11115.
Повний текст джерелаLiu, Guanhui. "Formulation of multifield finite element models for Helmholtz problems." Click to view the E-thesis via HKUTO, 2010. http://sunzi.lib.hku.hk/hkuto/record/B44204875.
Повний текст джерелаLiu, Guanhui, and 刘冠辉. "Formulation of multifield finite element models for Helmholtzproblems." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B44204875.
Повний текст джерелаFANTI, ALESSANDRO. "A generalized finite difference approach to the computation of modes." Doctoral thesis, Università degli Studi di Cagliari, 2012. http://hdl.handle.net/11584/266145.
Повний текст джерелаFaure, Cédric. "Contrôle de la diffusion par des façades : cas des métasurfaces et des guides d'ondes ouverts inhomogènes." Thesis, Le Mans, 2017. http://www.theses.fr/2017LEMA1033/document.
Повний текст джерелаThe aim of this thesis is to develop a scheme for controling the propagation of acoustic waves using heteregenous surfaces. Its results can be applied in the field of urban acoustic. The thesis is composed of two sections, each of them employing a different method. The first section focuses on controling the direction of a reflected wave, using a metasurface. The second concentrates on the influence of an inconsistent treatment to the side of an open waveguide on the wave joint and competitive effects of absorption, confinement and radiation. Part one provides experimental evidence that it is possible to conceal an object placed on a wall from an audible acoustic wave. To prove it, the thinest possible metasurface was constructed with Helmholtz resonators. The experimental results were compared to a numerical study realized with finite elements. This work was made in both temporal and frequency domains, allowing to point out the wide frequency characteristics of the metasurface. The numerical and experimental results show that the direction of a reflected wave can, indeed, be controled. Part two analyse the impact of a heterogeneous wall on the spreadinf of an acoustic wave in a street. Due to radiation losses, the street produces complex ways of propagation. The presence of a porous material on a waveguide‘ side deeply disrupt the spatial location of these waves, making them more or less fleeting. In particular, depending on the position of the material in the street, certain waves will be more confined to the inside of the street, radiating less towards the open external environment. They are consequently, less cushioned
Djoudi, Adel. "Binary level static analysis." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLX093.
Повний текст джерелаAutomatic software verification methods have seen increasing success since the early 2000s, thanks to several industrial successes (Microsoft, Airbus, etc.).Static program analysis aims to automatically infer verified properties of programs, based on their descriptions. The standard static analysis techniques apply on the software source code, written for instance in C or Java. However, access to source code is not possible for many safety-related applications, whether the source code is not available (mobile code, computer virus), or the developer does not disclose it (shelf components, third party certification).We are interested in this dissertation in design and development of a static binary analysis platform for safety analysis. Our contributions are made at three levels: semantics, implementation and static analysis.First, the semantics of analyzed binary programs is based on a generic, simple and concise formalism called DBA. It is extended with some specification and abstraction mechanisms in this dissertation. A well defined semantics of binary programs requires also an adequate memory model. We propose a new memory model adapted to binary level requirements and inspired from recent work on low-level C. This new model allows to enjoy the abstraction of the region-based memory model while keeping the expressiveness of the flat model.Second, our binary code analysis platform BinSec offers three basic services:disassembly, simulation and static analysis. Each machine instruction is translated into a block of semantically equivalent DBA instructions. The platform handles a large part of x86 instructions. A simplification step eliminates useless intermediate calculations in order to ease further analyses. Our simplifications especially allow to eliminate up to 75% of flag updates.Finally, we developed a static analysis engine for binary programs based on abstract interpretation. Besides abstract domains specifically adapted to binary analysis, we focused on the user control of trade offs between accuracy/correctness and efficiency. In addition, we offer an original approach for high-level conditions recovery from low-level conditions in order to enhance analysis precision. The approach is sound, efficient, platform-independent and it achieves very high ratio of recovery
Olivares, Nicole Michelle. "Accuracy of Wave Speeds Computed from the DPG and HDG Methods for Electromagnetic and Acoustic Waves." PDXScholar, 2016. http://pdxscholar.library.pdx.edu/open_access_etds/2920.
Повний текст джерелаMarinho, Leonardo Ribeiro. "Análise Completa das Fibras de Bragg de Núcleo Oco." Universidade do Estado do Rio de Janeiro, 2013. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=8141.
Повний текст джерелаThe evolution of digital communication systems is intrinsically related to the development of optical fiber technology. Since its creation in the 1960s, many studies have been conducted in order to increase the system capacity, such as the attenuation reduction, chromatic dispersion control and elimination of nonlinearities. In this context, Bragg fibers appear as a structure with great potential to mitigate these drawbacks. Bragg fibers have a different operational mechanism with respect to traditional fibers to support the confined modes. Their core has a low refractive index, and the cladding consists of dielectric rings of different refractive indices, allocated alternately. For a Bragg fiber with hollow core, as considered in this paper, there are losses due to the occurrence of leaky modes. Therefore, the dispersion analysis of these structures falls in the complex plane, making it even harder. This dissertation will be based on a strategy essential to the analysis of transverse modes: TE0m, TM0m and hybrids. The found results have been validated by comparing them with those obtained in the literature. The paper discusses the losses and dispersions of the mentioned modes, and the results obtained will serve to guide the research on Bragg fibers.
Soussi, Sofiane. "Quelques Modélisations Mathématiques en Optique." Phd thesis, Ecole Polytechnique X, 2004. http://tel.archives-ouvertes.fr/tel-00008756.
Повний текст джерелаDans la deuxième partie de la thèse, on s'intéressé à la méthode dite de la (\em supercell) qui est utilisée par les physiciens afin de donner une approximation des modes introduits par un défaut à support compact dans un cristal photonique. On étudie la convergence de cette méthode donnant un sens à la convergence du spectre de l'opérateur approché. La convergence exponentielle des valeurs propres dues au défaut est démontrée.
La troisième partie de la thèse est consacrée à l'étude de la propagation d'ondes électromagnétiques dans les fibres optiques photoniques. On dérive une modélisation mathématique de ces fibres dont l'enveloppe est constituée d'un cristal photonique bidimensionnel invariant selon l'axe de la fibre. Les modes guidés par la fibre sont caractérisés comme étant les valeurs propres d'opérateurs intégraux.
Costa, Ricardo Gomes da. "Estudo dos modos de Plasmon em Fibras fracamente guiadas com camadas dielétricas sobre Filme Metálico." Universidade do Estado do Rio de Janeiro, 2008. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=7456.
Повний текст джерелаIn this work the four Plasmon modes are analyzed, the symmetrical (Sb) and asymmetrical bounded (ab); the core (ln) and covering leaky modes (lc), that propagate in weakly guided optical fibers with a metallic film around that. In the metallic film a layer extra dielectric is deposited and above this, another layer denominated covering. The analysis will be developed for metallic films of the Silver, Palladium and Gold. This structure is very useful to making optical sensors.
Vianna, Pedro Arlindo Barroso Hardman. "Análise dos Modos de Plasmon em Fibras Ópticas com Contraste Arbitrário de Índices de Refração." Universidade do Estado do Rio de Janeiro, 2009. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=7541.
Повний текст джерелаIn this work it is done the analysis of the ways of plasmon that developed themselves in a mettalic film that covers an optic and generalized fiber. The studied ways of plasmon are: Cover-Leaky (lcv), Symmetric Bounded (Sb), Core-Leaky (lcr) and Asymmetrical Bounded (ab). The metallic films, for reason of comparison, used in this work, are: the silver, the gold and the paladium. It was developed a mathematical model of the electricmagnetic phenomenon and a software, that created a database which could make it easy the analysis of structures with several combinations of parameters. With the database have been got several graphs that let: analyse the types of plasmon, see the reduction of waves and the behaviour of the electricmagnetic field in each area of the structure. The confrontations between the structures with films of silver, gold and paladium made it possible to conclude that those elaborated with films of silver and gold are those that present smaller losses, so, are recommended in the confection of sensors. As silver is more accecible than gold it is advisable its utilization. The analysis and the results of this work are original in the specialized literature.
Williams, Paul David. "Nonlinear interactions of fast and slow modes in rotating, stratified fluid flows." Thesis, University of Oxford, 2003. http://ora.ox.ac.uk/objects/uuid:5365c658-ab60-41e9-b07b-0f635909835e.
Повний текст джерелаVegh, Viktor. "Numerical modelling of industrial microwave heating." Thesis, Queensland University of Technology, 2003. https://eprints.qut.edu.au/37144/7/37144_Digitised%20Thesis.pdf.
Повний текст джерелаMéry, Fabien. "Instabilités linéaires et rayonnement acoustique d'un écoulement sur une paroi présenatant une cavité." Toulouse, ISAE, 2010. http://www.theses.fr/2010ESAE0017.
Повний текст джерелаGoursaud, Benjamin. "Etude mathématique et numérique de guides d'ondes ouverts non uniformes, par approche modale." Phd thesis, Ecole Polytechnique X, 2010. http://pastel.archives-ouvertes.fr/pastel-00546093.
Повний текст джерелаBasley, Jérémy. "An Experimental Investigation on Waves and Coherent Structures in a Three-Dimensional Open Cavity Flow." Thesis, Paris 11, 2012. http://www.theses.fr/2012PA112245/document.
Повний текст джерелаA space-time study of a three-dimensional nonlinearly saturated open cavity flow is undertaken using time-resolved space-extended experimental data, acquired in both cross-stream and spanwise planes, in incompressible air and water flows. Through use of multiple modal decompositions in time and space, the waves and coherent structures composing the dynamics in the permanent regime are identified and characterised with respect to the instabilities arising in the flow.Effects of nonlinearities are thoroughly investigated in the impinging shear layer, regarding the self-sustained oscillations and their interactions with the inner-flow. In particular, the analysis conducted throughout the parameter space enlightens a global connection between the selection of locked-on modes and the amplitude modulation at the impingement and the mode switching phenomenon. Furthermore, observations of low frequencies interacting drastically with the shear layer flapping motion underline the existence of intrinsic coherent three-dimensional dynamics inside the cavity in spite of the shear layer disturbances.Linear stability analyses have demonstrated that centrifugal instabilities are at play along the main recirculation. The present investigation of the dynamics after onset of the saturation reveals numerous space-time coherent structures, whose properties are quantified and classified with respect to the underlying instabilities: travelling or standing spanwise waves. Finally, some patterns exhibited by the saturated structures suggest that the nonlinear mechanisms governing the mutations of the flow after the linear regime could gain more insight in the frame of amplitude equations
Basley, Jérémy. "Étude Expérimentale des Ondes et Structures Cohérentes dans un Écoulement Tridimensionnel de Cavité Ouverte." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00822898.
Повний текст джерелаBeale, Jennifer Claire. "Modeling fuel injection using Kelvin-Helmholtz/Rayleigh-Taylor hybrid atomization model in KIVA-3V." 1999. http://catalog.hathitrust.org/api/volumes/oclc/42012813.html.
Повний текст джерелаTypescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 101-105).
Boruah, Buddha Deka. "Coupled Optical and Electrochemical Properties of ZnCo2O4 for Radiation Sensitive Supercapacitor : An Approach Towards Self-powered Photosensitive Energy Storage." Thesis, 2017. http://etd.iisc.ac.in/handle/2005/4242.
Повний текст джерелаShabanian, Samira. "Bidirectional Helmholtz Machines." Thèse, 2016. http://hdl.handle.net/1866/16181.
Повний текст джерелаEfficient unsupervised training and inference in deep generative models remains a challenging problem. One basic approach, called Helmholtz machine, involves training a top-down directed generative model together with a bottom-up auxiliary model used for approximate inference. Recent results indicate that better generative models can be obtained with better approximate inference procedures. Instead of improving the inference procedure, we here propose a new model, the bidirectional Helmholtz machine, which guarantees that the top-down and bottom-up distributions can efficiently invert each other. We achieve this by interpreting both the top-down and the bottom-up directed models as approximate inference distributions and by defining the model distribution to be the geometric mean of these two. We present a lower-bound for the likelihood of this model and we show that optimizing this bound regularizes the model so that the Bhattacharyya distance between the bottom-up and top-down approximate distributions is minimized. This approach results in state of the art generative models which prefer significantly deeper architectures while it allows for orders of magnitude more efficient approximate inference. Moreover, we introduce a deep generative model for semi-supervised learning problems based on BiHM models.
Karakoc, Kerem. "Modeling and design optimization of electromechanical brake actuator using eddy currents." Thesis, 2012. http://hdl.handle.net/1828/4289.
Повний текст джерелаGraduate
Rotermund, Lina M. "The effects of sea ice on the tides in the Kitikmeot Sea: results using year–long current meter data from Dease Strait and tidal models." Thesis, 2019. http://hdl.handle.net/1828/11020.
Повний текст джерелаGraduate
2020-07-22
Koch, Philipp. "Partikelmodellierung der Strukturbildung akustischer Kavitationsblasen in Wechselwirkung mit dem Schalldruckfeld." Doctoral thesis, 2006. http://www.gbv.de/dms/goettingen/524828539.pdf.
Повний текст джерелаTylla, Alfred. "Erste Erfahrungen mit der Micro-Diagonalpumpe Deltastream® der Firma Medos (Helmholtz Institut Aachen) als linksventrikulärem Herzunterstützungssystem (LVAD) mit pulsatiler und laminarer Perfusion am Schafsmodell über sieben Tage." Doctoral thesis, 2011. http://hdl.handle.net/11858/00-1735-0000-0006-B2B0-A.
Повний текст джерелаARRIGHETTI, Walter. "Mathematical models and methods for Electromagnetism on fractal geometries." Doctoral thesis, 2007. http://hdl.handle.net/11573/1656600.
Повний текст джерелаTsuji, Paul Hikaru. "Fast algorithms for frequency domain wave propagation." 2012. http://hdl.handle.net/2152/19533.
Повний текст джерелаtext