Littérature scientifique sur le sujet « Onde de fuite »
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Articles de revues sur le sujet "Onde de fuite"
Carvalho, Luiz Fernando Medeiros de. « Animal em movimento ». Revista do Centro de Estudos Portugueses 27, no 38 (31 décembre 2007) : 91. http://dx.doi.org/10.17851/2359-0076.27.38.91-100.
Texte intégralMekkioui, Zahéra, et Henri Baudrand. « Analyse rigoureuse d’antenne diélectrique microruban uniforme à ondes de fuite ». Annales Des Télécommunications 57, no 5-6 (mai 2002) : 540–60. http://dx.doi.org/10.1007/bf02995175.
Texte intégralCharnay, Thierry. « "Les Désastreuses aventures" pédagogiques des schémas narratifs ». Ondina - Ondine, no 4 (14 octobre 2020) : 102–14. http://dx.doi.org/10.26754/ojs_ondina/ond.201944032.
Texte intégralSilva, Dimas Agostinho, Bruna Veridiana Muller, Eliane Cristina Kuiaski, Elder Eloy, Alexandre Behling et Cecilia Moura Colaço. « Propriedades da madeira de Eucalyptus benthamii para produção de energia ». Pesquisa Florestal Brasileira 35, no 84 (31 décembre 2015) : 481. http://dx.doi.org/10.4336/2015.pfb.35.84.677.
Texte intégralDa Silva Moreira, Letícia, et Victor Hugo Pereira Moutinho. « DENSIDADE BÁSICA E RESISTÊNCIA MECÂNICA DE MADEIRAS DE RESÍDUOS FLORESTAIS DA REGIÃO AMAZÔNICA ». Revista Agroecossistemas 10, no 2 (19 novembre 2018) : 64. http://dx.doi.org/10.18542/ragros.v10i2.5160.
Texte intégralRufini, Ana Luiza, José Roberto Soares Scolforo, Antonio Donizette de Oliveira et José Márcio de Mello. « Equações volumétricas para o cerrado sensu stricto, em Minas Gerais ». CERNE 16, no 1 (mars 2010) : 1–11. http://dx.doi.org/10.1590/s0104-77602010000100001.
Texte intégralMekkioui, Zahéra, et Henri Baudrand. « Analyse d’antenne diélectrique à ondes de fuite chargée de motif métallique quelconque/Dielectric leaky-wave antenna analysis of arbitrary metallic shape ». Annales Des Télécommunications 62, no 5-6 (mai 2007) : 663–89. http://dx.doi.org/10.1007/bf03253283.
Texte intégralCarvalho, Renata Reis de, Claudiney Do Couto Guimarães, Júlio Cesar Medeiros da Silva et Dione Richer Momolli. « Estoque de biomassa e de nutrientes em um povoamento do híbrido Eucalyptus urophylla x Eucalyptus grandis no Bioma Pampa – RS ». Revista Ecologia e Nutrição Florestal - ENFLO 3, no 3 (11 août 2016) : 71. http://dx.doi.org/10.5902/2316980x18275.
Texte intégralSilva Júnior, Adelson Lemes, Lucimara Cruz De Souza, Paulo Henrique De Souza, William Macedo Delarmelina, Fábio Demolinari De Miranda et Marcos Vinicius Winckler Caldeira. « SELEÇÃO DE ÁRVORES MATRIZES DE Schizolobium parahyba var. amazonicum (Huber ex. Ducke) Barneby NO ESPÍRITO SANTO ». Revista Univap 22, no 40 (10 janvier 2017) : 263. http://dx.doi.org/10.18066/revistaunivap.v22i40.692.
Texte intégralVaccaro, Sandro, et Solon Jonas Longhi. « Análise fitossociológica de algumas áreas remanescentes da floresta do Alto Uruguai, entre os rios Ijuí e Turvo, no Rio Grande do Sul. » Ciência Florestal 5, no 1 (30 mars 1999) : 33. http://dx.doi.org/10.5902/19805098309.
Texte intégralThèses sur le sujet "Onde de fuite"
Mohamed, Ahmed Aly Shaaban. « Reconstitution des courants de fuite d'un four micro-onde domestique ». Toulouse, INPT, 1993. http://www.theses.fr/1993INPT109H.
Texte intégralSiragusa, Romain. « Étude de nouvelles fonctions radiofréquences à base d'antennes à onde de fuite composite main droite/gauche ». Grenoble INPG, 2009. http://www.theses.fr/2009INPG0124.
Texte intégralThis work deals with the study of new radiofrequency applications based on the Composite Right/Left Handed (CRLH) Leaky-Wave Antenna (LWA). In the first part, we introduce the LWA and the CRLH theory. In the second part, circuit modelisation and automate design of CRLH strucutures are presented. We proved that the classical circuit model of interdigital capacitors needed to be completed and improved. We also developed a semi-automated tool for the synthesis and the analysis of a micro-strip CRLH unit cell. Afterword, a first fully automated approach to design CRLH transmission lines is presented. We used this approach to reduce the side lobes level of a non uniform CRLH LWA. The third part is devoted to the design of an electronic CRLH LWA using a double tuning to scan at constant frequency without mismatching. The subject of the fourth part is the use of phased antenna array for focalisation applications. Finally, a novel use of CRLH LWA in a phased antenna array is presented
Ghammaz, Abdelilah. « Application de l'imagerie micro-onde à la détection des courants de fuite des applicateurs ISM ». Toulouse, INPT, 1993. http://www.theses.fr/1993INPT090H.
Texte intégralLejay, Benoît. « Contribution à l'étude des antennes diélectriques périodiques à ondes de fuite et application à la réalisation d'un réseau ». Toulouse, INSA, 1993. http://www.theses.fr/1993ISAT0033.
Texte intégralArroyo, Alejandro. « Efficient design of metasurface antennas for satellite and satcom applications ». Electronic Thesis or Diss., Sorbonne université, 2022. http://www.theses.fr/2022SORUS411.
Texte intégralThe XXI century has become the most information-consuming/demanding society era. In this context, satellites’ communications must develop more accurate and new technologies capable to provide a huge amount of electromagnetic energy to citizens in an optimum way. Indeed, conceiving antennas that can focus on a determined target (and even follow this target) with a high-efficiency gain, not many losses, and a low-cost profile, is still a challenging area of research among many scientific laboratories in the world. Modulated tensorial metasurface antennas are an interesting solution to these technological requirements. They are based on metamaterials, which provide the possibility to control the desired aperture beam by manipulating their unit cell elements components. An aperture antenna (a desired radiated beam with some technical criteria such as high gain or large bandwidth) is achieved following the physical mechanism of surface wave / leaky wave transformation: whenever the antenna is switched on, surface waves will be appear at the interface. These excited surface waves will be traveling through the substrate medium, interacting with the elements composing the metasurface. These elements will possess different impedances, which depends on the geometry design. This principle requires modulation of the metasurface to 'convert' the surface wave into a desired leaky wave. This is achieved by placing a sinusoidally-modulated surface on the top of a grounded dielectric (patch-like support). If certain electromagnetic conditions are satisfied, leaky waves could be generated and a beam will be radiated away from the surface. Applying holographic techniques, a relation between the phase of the desired radiated field distribution and the phase of the incident surface waves can be established. Interesting results have been achieved following this design procedure. Some improvements in the design process are still required. Metasurface antennas need to achieve greater frequency bandwidth and more stable radiated beams. This thesis is a continuation of the research conducted at L2E/GeePs (Centralesupelec). Three main features will be reviewed: • Power efficiency • Polarization • Bandwidth. Issues concerning these properties will be explained, and for one of each, a solution will be proposed, investigated, tested, and validated
Ghomi, Mohammad. « Contribution à l'étude des antennes micro-rubans à ondes de fuite ». Toulouse, INPT, 1992. http://www.theses.fr/1992INPT015H.
Texte intégralKallel, Asma. « Modélisation et conception d'une antenne plasma à balayage basée sur des ondes de fuite ». Phd thesis, Toulouse 3, 2014. http://oatao.univ-toulouse.fr/14142/1/kallel.pdf.
Texte intégralKallel, Asma. « Modélisation et conception d'une antenne plasma à balayage basée sur des ondes de fuite ». Phd thesis, Toulouse 3, 2014. http://thesesups.ups-tlse.fr/2514/.
Texte intégralIn this work, a beam scanning leaky-wave antenna working at a fixed operating frequency and constructed from a grounded plasma layer is proposed. The radiation angle can be tuned by the plasma electron density which is controlled by the power. A 2D theoretical model based on a canonical structure is proposed to study the leaky waves. The antenna parameters (plasma thickness, length and permittivity) are dimensioned using this theoretical model, at 10 GHz, and a microwave source is chosen to excite the antenna. The scanning range of about 60° needs a plasma reaching an electron density of. In a second step an inductively coupled plasma source is chosen since it meets the dimensioning requirements. The measurements of the plasma parameters confirm the requirements. Finally, the antenna prototype is designed
Teniou, Mounir. « Metasurface antennas for space applications ». Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066281/document.
Texte intégralIn this thesis, a method for the implementation of arbitrary aperture field distributions using tensorial metasurfaces is introduced. Sinusoidally modulated metasurfaces are used in order to generate leaky waves with control on both phase and amplitude. The desired aperture phase distribution is obtained using a new local holography formulation. On the other hand, the amplitude distribution is controlled by varying modulation indices and average impedance depending on the position. A separate control of the aperture field components is achieved by modulating the impedance tensor elements independently. The theoretical formulation of the method is presented in details by taking into account the implementation method and antenna adaptation issues. The method is applied to design a wide range of radiation patterns examples both for far-field and near-field applications. The design procedure was first validated with simulations results for a working frequency of 20GHz giving a good agreement with the theoretical results. Several metasurfaces were then manufactured and measured for working frequencies of 10 GHz, 12.25 GHz and 20GHz. The consistency of the measurements and the simulation results proves that a good control of the aperture field phase and amplitude distributions is achieved using the proposed method
Scattone, Francesco. « Phased array antenna with significant reduction of active controls ». Thesis, Rennes 1, 2015. http://www.theses.fr/2015REN1S168/document.
Texte intégralThe objective of this thesis is to exploit the leaky-wave phenomena to enhance the performance of classical aperture antennas for space applications. Here, we consider planar configurations where the leaky modes are excited between a ground plane and a partially reflective superstrate. Arrangements of small apertures opening on the ground plane are used to feed the antennas under study. The superstrate-like leaky-wave structures are developed in array or phased array configurations, considered of interest in terms of flexibility of the system for next generation satellite links. In order to efficiently study planar leaky-wave arrays, we have developed an analysis tool based on a Green's function spectral approach. The developed tool allows to precisely analyze the proposed structure by taking into account the impact of the mutual coupling among the elements on the radiation performance of the whole antenna. In addition, it can handle extremely large structures in terms of wavelengths with a small computational effort with respect to commercial tools. In particular, the gain enhancement of leaky-based structures can pave the way to the reduction of the number of elements of the associated phased arrays. In a leaky-wave configuration each element of the array will radiate with a larger equivalent aperture allowing a larger spacing among elements without affecting the final gain of the whole structure. This aspect is particularly important in the case of phased arrays, where phase shifters and control cells are, typically, the most expensive components of the system. As extensively explained in the manuscript, antennas for user segment might find the highest benefit by using leaky-wave solutions. Besides the gain enhancement, the leaky-wave technology can be effectively exploited to conveniently shape the radiation pattern by properly engineering the design parameters of the antenna. This capability can be used in phased arrays to generate a convenient element pattern to minimize the scan losses and filter the grating lobes appearing in the visible space when dealing with periodicities larger than a wavelength. Therefore, a synthesis procedure for thinned leaky-wave arrays is presented in the manuscript. Also, a novel array configuration, the irregular superstrate array, is presented. The irregular superstrate allows the reduction of the side lobes of the antenna below -20 dB in the considered 2.5 % band, using a uniform excitation. This last configuration clearly shows that the shaping capability of leaky-wave antennas is the most appealing feature to be used in phased array solutions
Livres sur le sujet "Onde de fuite"
Simenon, Georges. La fuite de M. Monde. [Paris] : Presses pocket, 1992.
Trouver le texte intégralSimenon, Georges. La Fuite De Monsieur Monde. Editions Flammarion, 1988.
Trouver le texte intégralKinloch, David. In Search of Dustie-Fute. Carcanet Press, Limited, 2018.
Trouver le texte intégralIn Search of Dustie-Fute. Carcanet Press, Limited, 2017.
Trouver le texte intégralKinloch, David. In Search of Dustie-Fute. Carcanet Press, Limited, 2018.
Trouver le texte intégralChapitres de livres sur le sujet "Onde de fuite"
Silva de Oliveira, Carlos Henrique, Cheila Deisy Ferreira, Antônio Lucineudo de Oliveira Freire, Eder Ferreira Arriel et Jussara Silva Dantas. « Dendrologia de Cnidoscolus quercifolius Pohl : uma espécie endêmica do Bioma Caatinga ». Dans Estudos em Ciências Biológicas e Florestais, 53–67. Editora Licuri, 2023. http://dx.doi.org/10.58203/licuri.20415.
Texte intégralLindheim, Sara H. « What’s Love Got To Do With It ? » Dans Latin Elegy and the Space of Empire, 56–84. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198871446.003.0003.
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