Academic literature on the topic 'Bruit – Stabilité'
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Journal articles on the topic "Bruit – Stabilité"
Boukraa, Mohamed Aziz, Lorenzo Audibert, Marcella Bonazzoli, Houssem Haddar, and Denis Vautrin. "Imagerie d’interface barrage-fondation par inversion de forme d'onde complète." E3S Web of Conferences 504 (2024): 04002. http://dx.doi.org/10.1051/e3sconf/202450404002.
Full textDolas, Prakash M., and Karanam Kishore Kumar. "Retrieval of static stability parameter from the radiosonde/rawinsonde ascent rate profiles: a wavelet approach." Annales Geophysicae 27, no. 2 (February 2, 2009): 547–53. http://dx.doi.org/10.5194/angeo-27-547-2009.
Full textAnderson, R., D. H. Jones, and G. H. Gudmundsson. "Halley Research Station, Antarctica: calving risks and monitoring strategies." Natural Hazards and Earth System Sciences 14, no. 4 (April 17, 2014): 917–27. http://dx.doi.org/10.5194/nhess-14-917-2014.
Full textAnderson, R., D. H. Jones, and G. H. Gudmundsson. "Halley Research Station, Antarctica: calving risks and monitoring strategies." Natural Hazards and Earth System Sciences Discussions 1, no. 6 (November 5, 2013): 6227–56. http://dx.doi.org/10.5194/nhessd-1-6227-2013.
Full textBILLANT, PAUL. "Zigzag instability of vortex pairs in stratified and rotating fluids. Part 1. General stability equations." Journal of Fluid Mechanics 660 (July 21, 2010): 354–95. http://dx.doi.org/10.1017/s0022112010002818.
Full textReinecke, Patrick A., and Dale R. Durran. "Estimating Topographic Blocking Using a Froude Number When the Static Stability Is Nonuniform." Journal of the Atmospheric Sciences 65, no. 3 (March 1, 2008): 1035–48. http://dx.doi.org/10.1175/2007jas2100.1.
Full textZaire, Bonnie, and Laurène Jouve. "Dipolar stability in spherical simulations: The impact of an inner stable zone." Proceedings of the International Astronomical Union 15, S354 (June 2019): 185–88. http://dx.doi.org/10.1017/s1743921319009803.
Full textPérez, I. A., M. L. Sánchez, M. Á. García, and B. de Torre. "Boundary layer structure and stability classification validated with CO<sub>2</sub> concentrations over the Northern Spanish Plateau." Annales Geophysicae 27, no. 1 (January 21, 2009): 339–49. http://dx.doi.org/10.5194/angeo-27-339-2009.
Full textKumar, Naresh, M. Mohapatra, and B. P. Yadav. "Boundary Layer Impact on Mountain Waves across Western Ghats of India." Mapana - Journal of Sciences 10, no. 1 (June 30, 2011): 25–31. http://dx.doi.org/10.12723/mjs.18.3.
Full textCandelier, Julien, Stéphane Le Dizès, and Christophe Millet. "Inviscid instability of a stably stratified compressible boundary layer on an inclined surface." Journal of Fluid Mechanics 694 (February 2, 2012): 524–39. http://dx.doi.org/10.1017/jfm.2012.7.
Full textDissertations / Theses on the topic "Bruit – Stabilité"
Bouyrie, Raphaël. "Influences, stabilité au bruit et déficit isopérimétrique pour des modèles continus et discrets." Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30078/document.
Full textThe general topic of this Ph.D thesis is functional and geometrical inequalities, in both continuous and discrete setting. In particular, we make use of the monotone property along the heat flow, which had led to important developments in analysis, geometry and probability since the pioneer work of Bakry and Émery. More recently, this principle has been used in the analysis of Boolean functions in view of application in theoretical computer science. In the first part, we present some multiple integrals inequalities and geometric type inequalities obtained by monotonicity along the heat flow. We characterize, for most of them, equality cases and we put forward rigidity phenomenon in the setting of Riemannian manifolds. In particular, we study rigidity for the Bakry-Ledoux isoperimetric comparison theorem using their semigroup proof. This proof has been exploited by Mossel and Neeman to derive robust dimension free bounds for the Gaussian isoperimetry. We simplify their proof an in particular remove most of Gaussian-specific parts. This gives hope to derive robust estimates to more general log-concave measures or on high dimensional Euclidean spheres. The second part is devoted to analysis of Boolean functions. The principal contribution in this field is the extension of a criterion of Benjamini, Kalai and Schramm linking noise sensitivity and influences of a Boolean function. Such a criterion has been extended recently in continuous setting via the concept of geometric influence. We give a new, semigroup, proof of a quantitative version of it previously established in the discrete cube and in the Gaussian space. This quantitative version generalizes both to various models of Schreier graphs and more general continuous spaces. In particular, the quantitative version over the slices of the Boolean cube has consequences in percolation theory. In the last chapter, we link this quantitative criterion with a generalization over graph products of the "Junta" theorem of Friedgut
Muller, Frédéric. "Simulations de jets propulsifs : application à l'identification des mécanismes générateurs de bruit." Paris 6, 2006. http://www.theses.fr/2006PA066390.
Full textBouchet, Eric. "Étude du bruit d'interaction pale-sillage d'un rotor principal d'hélicoptère." Le Havre, 2002. http://www.theses.fr/2002LEHA0011.
Full textUnderstanding the mecanisms responsible for the BWI noise of helicopter main rotor which occures during perpendicular blade-vortex interaction. An extensive analysis of the blade pressure is performed to get a deeper insight of the BWI mecanism. A stability analysis of modelization of the incident flow (two rectilinear and parallel filaments) is undertaken. The numerical and theoritical results are found to be in good agreement and consistent with the proposed instability hypothesis
Vernotte, François. "Stabilité temporelle des oscillateurs : Nouvelles variances, leurs propriétés, leurs applications." Besançon, 1991. http://www.theses.fr/1991BESA2007.
Full textLeynia, de la Jarrige Émilie. "Sources de bruit actives ultra stables à faible température de bruit pour la radiométrie micro-onde." Toulouse 3, 2011. http://thesesups.ups-tlse.fr/1543/.
Full textRadiometers calibration onboard a satellite for Earth observation missions are based on the measurement of reference targets. These reference sources should be able to generate distinct brightness temperatures or noise temperatures. For the cold reference sources, the most common method is to use an external source, like the cold sky. As an alternative, the use of an active cold load (ACL) based on transistor presents several advantages in terms of integration and reduction of complexity of the system. The first part of this report is dedicated to the principles of the radiometry. At first, we remind the essential of remote sensing technics used for Earth observation, then a state of art of different types of radiometer is presented. One of the most important elements for this instrument concerns its calibration. Because of that, a state of art concerning reference sources, and more particularly the active cold loads, is exposed. After all, we notice that, with their low noise level and their frequency range cover, field effect transistors (FET) are good candidates. Thus, we present, in a second chapter, a new type of ACL based on the use of a SiGe heterojunction bipolar transistor (HBT) in L-band. We discuss the technology and topology of the circuit and show the results obtained concerning the adaptation, the noise temperature and the sensitivity to the ambient temperature. In order to compare different technologies on the long-term stability, we also present the conception and the characterization of anACL based on PHEMT GaAs. The third part concerns the realization of a specific radiometer, in order to assess the long-term stability of the developed ACLs. The concept of the radiometer was articulated around two critical points: to limit gain variations of the system in order to increase its stability and to obtain a good sensitivity. In this aim, technological, technical choices and performances of the system are described. At last, the fourth part of this report is dedicated to the study of the long term stability for two developed ACLs. These ones are very stable on the short-term, and present interesting characteristics on the long-term. The approaches concerning the difference in the two circuits in terms of their behavior and performances are discussed
Nguyen, Quôc Sy. "Nanopointes métalliques : étude de la stabilité et du bruit du courant à émission de champ." Lyon 1, 1993. http://www.theses.fr/1993LYO10136.
Full textDupouy, Emmanuel. "Etude et réalisation d’un oscillateur bande X, contrôlé en tension, à varactor MEMS, pour application spatiale." Limoges, 2009. https://aurore.unilim.fr/theses/nxfile/default/0a7b6cfb-c69f-4fd5-bc50-364c054aa7c4/blobholder:0/2009LIMO4006.pdf.
Full textThis research work is dedicated to the design and realization of a 10 GHz voltage controlled oscillator. A feasibility study of the oscillator using MEMS varactor to control the oscillation frequency is realized. First chapter presents analysis methods enabling to simulate accurately all of circuit electrical characteristics before its realization : start-up conditions, steady-state and phase noise analysis. Second chapter presents the non linear modeling of the SiGe heterojonction bipolar transistor used to design the oscillator. Second part of this chapter shows low frequency noise modeling of this transistor, since it’s the major contribution of phase noise near the carrier. Thrid Chapter is devoted to the design of the final oscillator. The different design steps using tools presented in the first chapter and models presented in the second chapter are explained. This work leads to the realization of a fixed frequency oscillator and a voltage controlled oscillator respectively reaching phase noise of -119 dBc/Hz and -115 dBc/Hz @ 100 kHz from the carrier
Leynia, De La Jarrige Emilie. "Sources de bruit actives ultra stables à faible température de bruit pour la radiométrie micro-onde." Phd thesis, Université Paul Sabatier - Toulouse III, 2011. http://tel.archives-ouvertes.fr/tel-00662860.
Full textGuénanff, Ronan. "Couplage instationnaire Navier-Stokes/Euler pour la génération et le rayonnement des sources de bruit aérodynamique." Rennes 1, 2004. https://tel.archives-ouvertes.fr/tel-00068113.
Full textKoenig, Maxime. "Réduction de bruit de jet par injection fluidique en corps central tournant." Poitiers, 2011. http://www.theses.fr/2011POIT2324.
Full textIn this study, we explore a novel jet noise reduction device involving the steady injection of fluid from two diametrically-opposed ports on a rotating centerbody. We observe noise reductions over a low-frequency range up to the rotation frequency for the rotation speeds currently possible. Flow measurements are made with timeresolved stereo PIV for the baseline jet and three control cases with different rotation frequencies (Rotation Strouhal numbers are St=0. 06, St=0. 12 and St=0. 23). Results suggest that the flow can be loosely decomposed into a perturbation area, where changes of the flow are monotonic with the rotation frequency, and a jet response area where the role of the instability modes seems prevailing. It appears that the actuator is efficient in driving a high-intensity mode 2 in the flow. Comparisons are made with the spatial linear stability theory of Michalke. Results suggest : (1) that the noise reduction mechanism may be due to the most unstable flow modes (axisymmetric mode m = 0) being deprived of fluctuation energy due to an excitation of less unstable modes (azimuthal mode m = 2 driven at St=0. 23). (2) Non-linear mechanisms in the flow for the St=0. 12 case lead to an increase of jet noise radiation in the far field. (3) The deformation of the mean axial velocity profile for the St=0. 23 case leads to a mode 0 which is less unstable and this case allows to introduce turbulence in the jet response area rather than wavepackets
Books on the topic "Bruit – Stabilité"
Jean-Christophe, Servant, ed. Afriques, années zéro: Du bruit à la parole. Nantes: Atalante, 2008.
Find full textBook chapters on the topic "Bruit – Stabilité"
Stoltze, D., J. Harms, and A. Nanassy. "Wertigkeit der Stabilität bei der Indikation zur operativen Behandlung von Verletzungen der Brust- und Lendenwirbelsäule." In Rehabilitation beginnt am Unfallort, 115–21. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-77231-3_23.
Full textSchwartzberg, Steven. "Rupture: The Shattering of Meaning." In A Crisis of Meaning, 101–24. Oxford University PressNew York, NY, 1996. http://dx.doi.org/10.1093/oso/9780195096279.003.0005.
Full textShettigar, Jagadish, and Pooja Misra. "Functional Autonomy to Banks." In Resurgent India, 176—C3.5.P3. Oxford University PressOxford, 2022. http://dx.doi.org/10.1093/oso/9780192866486.003.0035.
Full textNzimakwe, Thokozani Ian, and Sakhile Zondi. "Coalitions in South African Local Government and the Implications for Public Service Delivery." In Advances in Public Policy and Administration, 263–76. IGI Global, 2024. http://dx.doi.org/10.4018/979-8-3693-1654-2.ch016.
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