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Dissertations / Theses on the topic 'Bessel'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Elad, Altman Henri. "Integration by parts formulae for the laws of Bessel bridges, and Bessel stochastic PDEs." Thesis, Sorbonne université, 2019. http://www.theses.fr/2019SORUS441.

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Dans cette thèse, nous obtenons des formules d’intégration par parties pour les lois de ponts de Bessel de dimension δ > 0, étendant ainsi les formules précédemment obtenues par Zambotti dans le cas δ ≥ 3. Ceci nous permet d’identifier la structure de certaines EDP stochastiques (EDPS) ayant la loi d’un pont de Bessel de dimension δ ∈ (0, 3) pour mesure invariante, et qui étendent de manière naturelle les EDPS considérées précédemment par Zambotti dans le cas δ ≥ 3. Nous nommons ces équations EDPS de Bessel, et les écrivons à l’aide de temps locaux renormalisés. Dans les cas particuliers δ

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2

Maahs, Ilse [Verfasser], and Hans Rudolf [Akademischer Betreuer] Lerche. "Curved boundary crossing of bessel processes." Freiburg : Universität, 2016. http://d-nb.info/1119717701/34.

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3

Dallaire, Michael. "Faisceaux Bessel spatiotemporels : théorie et expérimentation." Thesis, Université Laval, 2013. http://www.theses.ulaval.ca/2013/29894/29894.pdf.

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Les travaux présentés dans cette thèse portent en premier lieu sur l’établissement d’un modèle théorique décrivant une nouvelle famille de faisceaux invariants reposant sur une distribution correspondant à la fonction de Bessel dans le plan spatiotemporel, d’où leur nom de faisceaux Bessel spatiotemporels (BST). Le modèle analytique décrivant ces faisceaux n’a pas de bornes physiques, ce qui se traduit par une impossibilité de les générer expérimentalement. Il est cependant possible dans les faits de limiter l’étendue spatiale et temporelle de ceux-ci en utilisant par exemple une enveloppe gau

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4

Noshirvani, Allahabadi Golchehr, and Allahabadi Golchehr Noshirvani. "Bessel Light Sheet Structured Illumination Microscopy." Diss., The University of Arizona, 2016. http://hdl.handle.net/10150/621810.

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Biomedical study researchers using animals to model disease and treatment need fast, deep, noninvasive, and inexpensive multi-channel imaging methods. Traditional fluorescence microscopy meets those criteria to an extent. Specifically, two-photon and confocal microscopy, the two most commonly used methods, are limited in penetration depth, cost, resolution, and field of view. In addition, two-photon microscopy has limited ability in multi-channel imaging. Light sheet microscopy, a fast developing 3D fluorescence imaging method, offers attractive advantages over traditional two-photon and confo

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5

Dallaire, Michaël. "Faisceaux Bessel spatiotemporels : théorie et expérimentation." Doctoral thesis, Université Laval, 2013. http://hdl.handle.net/20.500.11794/24630.

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Les travaux présentés dans cette thèse portent en premier lieu sur l’établissement d’un modèle théorique décrivant une nouvelle famille de faisceaux invariants reposant sur une distribution correspondant à la fonction de Bessel dans le plan spatiotemporel, d’où leur nom de faisceaux Bessel spatiotemporels (BST). Le modèle analytique décrivant ces faisceaux n’a pas de bornes physiques, ce qui se traduit par une impossibilité de les générer expérimentalement. Il est cependant possible dans les faits de limiter l’étendue spatiale et temporelle de ceux-ci en utilisant par exemple une enveloppe gau

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6

Fay, TH, and PH Kloppers. "The Gibbs’ phenomenon for Fourier–Bessel series." International Journal of Mathematical Education in Science and Technology, 2003. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001984.

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Summary The paper investigates the Gibbs’ phenomenon at a jump discontinuity for Fourier–Bessel series expansions. The unexpected thing is that the Gibbs’ constant for Fourier–Bessel series appears to be the same as that for Fourier series expansions. In order to compute the coefficients for Fourier–Bessel functionsefficiently, several integral formulasare derived and the Struve functions and their asymptotic expansions discussed, all of which significantly ease the computations. Three numerical examples are investigated. Findings suggest further investigations suitable for undergraduate resea

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7

Omoefe, Idisi David, and Andrew Forbes. "Creation and detection of Vector Bessel Beams." Thesis, University of Fort Hare, 2016. http://hdl.handle.net/10353/1785.

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Bessel beams are optical fields which falls into the category of non-diffracting beams. Vector Bessel beams are vector beams possessing cylindrical symmetry. Cylindrically symmetric beams tend to have a tight focal point during propagation. The tight focal beam nature of vector Bessel beams makes them a good potential in various facets of science such as biological optical trapping, wireless communications, remote sensing, microscopy etc. In this research work, vector Bessel beams were generated using the phase of an Axicon that was encoded into a spatial light modulator. Firstly, scalar Besse

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8

Qi, Zhi. "Theory of Bessel Functions of High Rank." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1428530485.

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9

Ouadghiri, Idrissi Ismail. "Nonlinear instabilities and filamentation of Bessel beams." Thesis, Bourgogne Franche-Comté, 2018. http://www.theses.fr/2018UBFCD071/document.

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Un faisceau de Bessel est un champ électromagnétique résistant à la diffraction. il peut se propager en préservant son profile transversal d'intensité même en régime de filamentation. Ceci est très avantageux pour les applications laser de haute puissance, en particulier parce qu’ils permettent de générer des canaux de plasma homogènes dans les diélectriques. Cependant, à haute intensité, les impulsions laser ultracourtes subissent, dans certaines conditions expérimentales (faible focalisation), des instabilités non linéaires entraînant la modulation d’intensité du lobe central au cours de la

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10

Fortin, Pierre-Yves. "Figure d'interférence par faisceaux Bessel, étude et applications." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq33637.pdf.

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11

Müller, Angelina [Verfasser], and Ulrike [Akademischer Betreuer] Wallrabe. "Micro-optical components for depth-controlled Bessel beams." Freiburg : Universität, 2019. http://d-nb.info/1188196006/34.

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12

Caron, Christian Frédéric Roger Caron. "Harmonic generation in gases using Bessel-Gauss beams." Thesis, Durham University, 1998. http://etheses.dur.ac.uk/4668/.

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The generation and propagation of harmonics in an atomic gas are described for the case of an incident Bessel-Gauss beam. Theoretical expressions are derived for the far-field amplitude of the harmonic field by solving the propagation equation using an elaborate integral formalism. We establish simple rules which determine the optimum Bessel-Gauss beam with respect to phase-matching as a function of the medium properties, such as the dispersion and the gas density. Target depletion due to photoionization and refractive index variations originating from both free electrons and dressed linear at

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13

Hornik, Kurt, and Bettina Grün. "Amos-type bounds for modified Bessel function ratios." Elsevier, 2013. http://dx.doi.org/10.1016/j.jmaa.2013.05.070.

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14

Dion, Jean-François. "Conception et réalisation d'un résonateur Bessel auto-filtrant." Master's thesis, Université Laval, 2015. http://hdl.handle.net/20.500.11794/26011.

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Le faisceau Bessel, solution exacte de l’équation d’onde, possède une zone où il garde pratiquement la même forme et les mêmes dimensions ; dans cette zone, il ne diffracte pas. Cette propriété intéressante a amené, depuis les années 80, plusieurs groupes de recherche à concevoir des cavités laser produisant ce type de faisceau non-diffractant. Une des difficultés de cette tâche réside dans la sélection des modes transverses du résonateur. Dans la plupart des cas, le problème est résolu en bloquant les modes supérieurs avec un iris, ce qui limite souvent le faisceau en propagation et en puissa

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15

Dib, Hacen. "Fonctions de Bessel sur une algèbre de Jordan." Université Louis Pasteur (Strasbourg) (1971-2008), 1988. http://www.theses.fr/1988STR13150.

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16

Grecco, Ryan Francis. "Microwave Bessel-Beam Propagation through Spatially Inhomogeneous Media." ScholarWorks @ UVM, 2017. http://scholarworks.uvm.edu/graddis/726.

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Long range wireless power transmission (WPT) is a critical technology for the development of remote power systems for air and space vehicles as well as for point-to-point transmission on Earth. This can be achieved using either a laser for transmission in the infrared to optical frequency domain or by using microwaves. The objective of this research is to study the application of microwave power transmission (MPT) through the use of a so-called Bessel-beam whose unique propagation properties include a self-healing ability as well as non-diffractive properties. These two unique properties lead

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17

Norfolk, Andrew W. G. "Bessel beams : a novel approach to periodic structures." Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/6035.

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Bessel and Bessel-like beams in Kerr-like nonlinear materials are numerically investigated. This is conducted with a view to exploiting the behaviour of such profiles for the direct laser writing of periodic structures in highly nonlinear glasses. A highly efficient numerical model is developed for the propagation of radially symmetric profiles based on the quasi-discrete Hankel transform (QDHT), making use of a reconstruction relation to allow the field to be sampled at arbitrary positions that do not coincide with the numerical grid. This Hankel-based Adaptive Radial Propagator (HARP) is sho

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18

Dib, Hacen. "Fonctions de Bessel sur une algèbre de Jordan." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37613169j.

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19

Bhattarai, Dipesh. "Application of Bessel beams in the human eye." Thesis, Queensland University of Technology, 2019. https://eprints.qut.edu.au/129455/9/Dipesh_Bhattarai_Thesis.pdf.

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Bessel light beams have spread-resistant and self-reconstruction properties. These beams were compared with conventional light beams for ophthalmic applications. The Bessel beams increased the strength of reflections used to determine ocular lens parameters, improved fixation stability, and decreased light loss during imaging of the retina. These findings indicate that Bessel beams have application in clinical ophthalmic instruments.

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20

Chellali, Mustapha. "Congruences, nombres de Bernoulli et polynômes de Bessel." Université Joseph Fourier (Grenoble ; 1971-2015), 1989. http://www.theses.fr/1989GRE10091.

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En premiere partie, on donne des congruences entre nombres de bernoulli-hcowitz dans le cas supersingulier. En deuxieme partie, on montre que la suite des nombres de bernoulli verifie des formules de recurrence qui servent a tester si un nombre premier est irregulier. En troisieme partie, on etudie les zeros des polynomes de bessel generalises, en particulier on encadre un zero reel, apres developpement asymptotique, et on donne des estimations uniformes des valeurs de ces polynomes

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21

Polat, Zeynep Sonay. "Studies On The Generalized And Reverse Generalized Bessel Polynomials." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12604961/index.pdf.

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The special functions and, particularly, the classical orthogonal polynomials encountered in many branches of applied mathematics and mathematical physics satisfy a second order differential equation, which is known as the equation of the hypergeometric type. The variable coefficients in this equation of the hypergeometric type are of special structures. Depending on the coefficients the classical orthogonal polynomials associated with the names Jacobi, Laguerre and Hermite can be derived as solutions of this equation. In this thesis, these well known classical polynomials as well as another

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22

Tovmasyan, Nariné. "Optimisation de la sensibilité d'un interféromètre à faisceaux Bessel." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ57892.pdf.

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23

Rogel-Salazar, Jesus. "Aspects of Bose-Einstein condensation and Bessel beam resonators." Thesis, Imperial College London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397329.

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24

Rodrigues, Fabio Grangeiro 1980. "Sobre cálculo fracionário e soluções da equação de Bessel." [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/306992.

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Orientador: Edmundo Capelas de Oliveira<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Matemática Estatística e Computação Científica<br>Made available in DSpace on 2018-08-26T23:00:41Z (GMT). No. of bitstreams: 1 Rodrigues_FabioGrangeiro_D.pdf: 1185818 bytes, checksum: 96f82c6ff4622e4ecdd3ccae79803dae (MD5) Previous issue date: 2015<br>Resumo: Neste trabalho é apresentado um modo de se obter soluções de um caso particular da equação hipergeométrica confluente, a equação de Bessel de ordem p, utilizando-se da teoria do cálculo de ordem arbitrária, também conhecido pop

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25

Favreau, Luc. "Combinatoire des tableaux oscillants et des polynomes de Bessel." Bordeaux 1, 1991. http://www.theses.fr/1991BOR10527.

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Nous nous interessons, dans ce travail, a la classe des tableaux oscillants generalisant les tableaux de young standards (ces derniers ayant ete abondamment etudies, par exemple dans le cadre des representations du groupe symetrique). Nous proposons une correspondance entre tableaux oscillants et generateurs de l'algebre de brauer possedant des proprietes analogues a celle de robinson-schensted pour le groupe symetrique. Nous en deduisons des formules d'enumeration pour ces tableaux suivant plusieurs parametres: longueur, forme finale et hauteur de la bande dans laquelle ils evoluent. Pour ter

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26

Castillo, René Erlin. "Generalized Non-Autonomous Kato Classes and Nonlinear Bessel Potentials." Ohio University / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1121964346.

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27

Bélanger, Brigitte. "Auto-imagerie en coordonnées cylindriques à l'aide de faisceaux Bessel." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq25490.pdf.

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28

Ben, Ghanem Riadh. "Fonctions de Bessel et formules de quadrature de type gaussien." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ32584.pdf.

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29

Dusablon, Laurent. "Faisceaux Bessel-Gauss spatiotemporels : interférométrie spectrale par transformée de Fourier." Master's thesis, Université Laval, 2015. http://hdl.handle.net/20.500.11794/26525.

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30

Xu, Dongli, Weibin Zhou, and Leilei Peng. "Cellular resolution multiplexed FLIM tomography with dual-color Bessel beam." OPTICAL SOC AMER, 2017. http://hdl.handle.net/10150/623268.

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Fourier multiplexed FLIM (FmFLIM) tomography enables multiplexed 3D lifetime imaging of whole embryos. In our previous FmFLIM system, the spatial resolution was limited to 25 mu m because of the trade-off between the spatial resolution and the imaging depth. In order to achieve cellular resolution imaging of thick specimens, we built a tomography system with dual-color Bessel beam. In combination with FmFLIM, the Bessel FmFLIM tomography system can perform parallel 3D lifetime imaging on multiple excitation-emission channels at a cellular resolution of 2.8 mu m. The image capability of the Bes

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31

Hassan, Mostafa. "Ultrafast imaging of Bessel beam generated nano-plasmas within dielectrics." Electronic Thesis or Diss., Bourgogne Franche-Comté, 2022. http://indexation.univ-fcomte.fr/nuxeo/site/esupversions/9cc27edd-c3bb-4525-a1f5-e5e8f55c54c1.

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Les lasers femtoseconde ultra-intense sont largement utilisés pour le traitement des matériaux à l'échelle micro et nanométrique. Dans ce contexte, il est nécessaire de contrôler l'interaction laser-matière. Les faisceaux non diffractants, tels que les faisceaux de Bessel, offrent des avantages substantiels en ce qui concerne la stabilité de la propagation non linéaire dans les diélectriques. Ils ont permis la génération de nano-vides de rapport d'aspect extrêmement élevé. Cependant, les modèles conventionnels décrivant l'interaction Bessel-diélectrique ne parviennent pas à expliquer les obser

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32

Adeyemi, Oluwafemi Ibukunoluwa. "The design of GaAs HEMT and HBT Bessel-type transimpedance amplifiers." Thesis, Texas A&M University, 2006. http://hdl.handle.net/1969.1/4663.

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The need of the everyday user to transfer large amounts of data is driving the need for larger data transfer capacity. Optical communication networks can satisfy this need. To be economically viable, optical transceivers must be integrated onto chips at low cost, using relatively cheap semiconductor processes. The optical preamplifier (transimpedance amplifier) receives optical information and converts it to a useful electrical form. It must operate at high speed, contribute little distortion to the input signal, and add little electrical noise to the incoming signal. This thesis investigates

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33

DeFranco, Mario A. (Mario Anthony). "The unramified principal series of p-adic groups : the Bessel function." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/90183.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mathematics, 2014.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 99-101).<br>Let G be a connected reductive group with a split maximal torus defined over a nonarchimedean local field. I evaluate a matrix coefficient of the unramified principal series of G known as the "Bessel function" at torus elements of dominant coweight. I show that the Bessel function shares many properties with the Macdonald spherical function of G, in particular the properties described in Casselman's 1980 evalu

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34

Ratsibi, Humbelani Edzani. "Laser drilling of metals and glass using zero-order bessel beams." University of the Western Cape, 2013. http://hdl.handle.net/11394/5428.

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>Magister Scientiae - MSc<br>This dissertation consists of two main sections. The first section focuses on generating zero order Bessel beams using axicons. An axicon with an opening angle y = 5⁰ was illuminated with a Gaussian beam of width ω₀ = 1.67 mm from a cw fiber laser with central wavelength λ = 1064 nm to generate zero order Bessel beams with a central spot radius r₀ = 8.3 ± 0.3 μm and propagation distance ½zmax = 20.1 ± 0.5 mm. The central spot size of a Bessel beam changes slightly along the propagation distance. The central spot radius r₀ can be varied by changing the opening angle

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35

Takata, Tomohiro. "Certain multiple orthogonal polynomials and a discretization of the Bessel equation." 京都大学 (Kyoto University), 2006. http://hdl.handle.net/2433/144354.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(理学)<br>甲第11975号<br>理博第2955号<br>新制||理||1442(附属図書館)<br>23788<br>UT51-2006-C655<br>京都大学大学院理学研究科数学・数理解析専攻<br>(主査)教授上野健爾, 教授井川満, 教授河野明<br>学位規則第4条第1項該当

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Charpin, Pierre-Jean. "Modélisation de l'interaction laser-plasma dans les faisceaux de Bessel femtoseconde." Electronic Thesis or Diss., Bourgogne Franche-Comté, 2024. http://indexation.univ-fcomte.fr/nuxeo/site/esupversions/fe2dc0aa-3386-4ecd-a96f-7f70a3113aa7.

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Les impulsions femtoseconde mises en forme de faisceaux de Bessel permettent de créer des nano-plasmas denses dans les diélectriques, menant à la formation de nano-vides à très haut rapport de forme pour des applications dans le domaine de la microélectronique. La modélisation de l'interaction laser-plasma est de prime importance pour comprendre l'évolution spatio-temporelle de la création de plasma et du dépôt d'énergie par l'impulsion laser femtoseconde. Ceci permettra de développer une interaction laser-matière extrêmement efficace dans d'autres géométries et matériaux. La thèse a pour obje

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Queiroz, Pedro Afonso Teodoro Faria. "Aplicação da equação de Bessel fracionária na descrição da topografia da córnea." Master's thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/21196.

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Mestrado em Matemática e Aplicações<br>A visão é o sentido mais crucial que possuímos, uma vez que nos permite perceber o mundo de forma muito precisa. Com o avanço da tecnologia médica, o tratamento de diversas doenças oftalmológicas torna-se mais adequado e bem sucedido. Isso não seria possível sem os devidos modelos matemáticos da biomecânica do olho e seus constituintes. Uma das partes mais importantes do olho humano é a córnea, porque é responsável por cerca de dois terços do poder da refração. A descrição matemática da topografia da córnea é muito importante do ponto de vista dos

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Notaros, Jelena. "Fresnel-focusing and bessel-beam integrated optical phased arrays for optical trapping applications." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/112046.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2017.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 107-112).<br>Optical trapping and tweezing - the manipulation of particles using optical forces - enables direct interaction with biological samples and non-invasive monitoring of their properties. As such, optical trapping has become a common tool in biology with applications ranging from better understanding of DNA mechanics to non-invasive manipulation of red blood cells in vivo. While opt

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Grosjean, Thierry. "Concept et étude d'un microscope optique en champ proche à pointe virtuelle pouvant travailler en zone de non couplage." Besançon, 2003. http://www.theses.fr/2003BESA2030.

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40

Manz, Thomas. "Stimulierte Stokes- und Anti-Stokes-Raman-Streuung mit Bessel-Bündeln in Aceton und Wasserstoff." [S.l. : s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=975789325.

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Vieira, Tárcio de Almeida. "Axicons fotorrefrativos : estudo de Efeitos Foto-Induzidos por feixe de Bessel em cristais fotorrefrativos." reponame:Repositório Institucional da UFABC, 2010.

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42

Orr, Andrew McLean White. "Computational techniques for evaluating extremely low frequency electromagnetic fields produced by a horizontal electric dipole in seawater." Thesis, King's College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326222.

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43

Béraud, Jean-François. "Étude topologique des cartes, équations fonctionnelles et énumérations." Université de Marne-la-Vallée, 1998. http://www.theses.fr/1998MARN0038.

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Ce travail est divise en trois parties : apres avoir introduit les notions de cartes pointees topologiques et combinatoires, on presente differentes operations topologiques sur les cartes pointees. Les principales operations traitees sont l'operation topologique de suppression du brin pointe tout d'abord, et ensuite les operations plus complexes d'ouverture du sommet pointe et d'extraction du schema de carte. La deuxieme partie presente en premier lieu les equations que l'on peut obtenir a partir des operations topologiques presentees dans la premiere partie. On montre ensuite diverses enumera

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44

Siriwardena, Pathiranage Lochana Pabakara. "STOCHASTIC MODELS IN POPULATION DYNAMICS." OpenSIUC, 2014. https://opensiuc.lib.siu.edu/dissertations/908.

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This dissertation discusses the construction of some stochastic models for population dynamics with a variety of birth and death rate functions. A general model is constructed considering a fundamental growth rate function of the population while allowing random births and deaths in the population. Four stochastic discrete delay models and two non-delay models using the infinitesimal mean and variance given by birth and death rate functions have been produced and analyzed. In these constructions drift terms are in the form of logistic growth or logistic growth with delay. Logistic growth m

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MAINSEL, FRANCIOSO ANNE-MARIE. "La maladie exostosante ou maladie de bessel-hagen : a propos d'une serie hospitaliere de 7 cas." Saint-Etienne, 1990. http://www.theses.fr/1990STET6202.

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Meinert, Tobias [Verfasser], Alexander [Akademischer Betreuer] Rohrbach, and Ulrich [Akademischer Betreuer] Kubitscheck. "Optimierungsstrategien zur computerholographischen Beleuchtung und zur Abbildung streuender Objekte in der Lichtscheibenmikroskopie mit Bessel-Strahlen." Freiburg : Universität, 2018. http://d-nb.info/1151817910/34.

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Augello, Elisa. "Precise Near-Field Focusing exploiting Bessel Beam Launchers for Wireless Power Transfer at millimeter waves." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amslaurea.unibo.it/25774/.

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Abstract:

Wireless Power Transfer has become a promising technology to overcome the limits of wired solutions. Within this framework, the objective of this thesis is to study a WPT link at millimeter waves involving a particular type of antenna working in the radiative near-field, known as Bessel Beam (BB) Launcher. This antenna has been chosen for its peculiarity of generating a Bessel Beam which is by nature non-diffractive, showing good focusing and self-healing capabilities. In particular, a Bull-Eye Leaky Wave Antenna is designed and analysed, fed by a loop antenna and resonating at approximately 3

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Marzec, Jolanta. "On Bessel models for GSp₄ and Fourier coefficients of Siegel modular forms of degree 2." Thesis, University of Bristol, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.702462.

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In this work, we make a detailed study of the Fourier coefficients of cuspidal Siegel modular forms of degree 2. We derive a very general relation between the Fourier coefficients that extends previous work in this direction by Andrianov, Kowalski-Saha-Tsimerman and others. The basis for our relation is the dependence between values of global Bessel periods and averages of Fourier coefficients. Consequently our relation applies also to Bessel periods of more general automorphic forms on GSp4(A). We use our relation to prove that cuspidal Siegel modular forms associated to P-CAP representations

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F, SARRI. "Optical microstructuring of alkali metal nanoparticle coatings on porous silica substrates induced by Bessel beam." Doctoral thesis, Università di Siena, 2019. http://hdl.handle.net/11365/1075534.

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The ability to control atomic adsorption/desorption processes by light as well as nanoparticle growth on proper substrates is nowadays recognized as a promising technique in nanotechnology. This subject is a part of a rising area of research devoted to the development of micro and nanophotonic devices, sensors, metamaterials. The experimental work in this thesis aims at obtaining ordered microstructures exploiting atomic desorption phenomena such as LIAD (Light Induced Atomic Desorption). The suitable substrates consist in nanoporous silica matrices sealed inside cells and exposed to alk

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Kalliterakis, Adonios. "Comportement à l'inifini des fonctions de Bessel associées aux représentations des algèbres de Jordan euclidiennes." Nancy 1, 1996. http://www.theses.fr/1996NAN10309.

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On étudie le comportement asymptotique de la fonction de Bessel généralisée (au sens de J. Faraut et G. Travaglini) d'une algèbre de Jordan euclidienne simple associée à une représentation régulière. On établit, par la méthode de la phase stationnaire, le développement asymptotique de cette fonction le long d'un rayon appartenant au cône symétrique fermé de l'algèbre, et on obtient une estimation uniforme précise.

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