Literatura académica sobre el tema "Balance de vorticité linéaire"
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Artículos de revistas sobre el tema "Balance de vorticité linéaire"
VERNEY, D., M. LEBOIS, F. IBRAHIM, S. ESSABAA, F. AZAIEZ, M. CHEIKH MHAMED, E. COTTEREAU et al. "STRUCTURE OF THE NEUTRON RICH Ga AND Ge ISOTOPES OBSERVED AT ALTO". International Journal of Modern Physics E 18, n.º 10 (noviembre de 2009): 1976–80. http://dx.doi.org/10.1142/s0218301309014111.
Texto completoGrégoire, Tania. "Identité contemporaine et poétique du mouvement dans l’œuvre de Marie-Andrée Gill". Quebec Studies 73, n.º 1 (1 de junio de 2022): 31–52. http://dx.doi.org/10.3828/qs.2022.4.
Texto completoSAUVANT, D., G. CANTALAPIEDRA-HIJAR, L. DELABY, J. B. DANIEL, P. FAVERDIN y P. NOZIÈRE. "Actualisation des besoins protéiques des ruminants et détermination des réponses des femelles laitières aux apports de protéines digestibles dans l’intestin". INRA Productions Animales 28, n.º 5 (14 de enero de 2020): 347–68. http://dx.doi.org/10.20870/productions-animales.2015.28.5.3038.
Texto completoIDRIS, Halima Abdulkadir. "Declining Urban Greenery in Kano Metropolis, Nigeria". AFRIGIST JOURNAL OF LAND ADMINISTRATION AND ENVIRONMENTAL MANAGEMENT 2, n.º 1 (17 de mayo de 2022): 1–13. http://dx.doi.org/10.54222/afrigist/ajlaem/v2i1.1.
Texto completoIDRIS, Halima Abdulkadir. "Declining Urban Greenery in Kano Metropolis, Nigeria". AFRIGIST JOURNAL OF LAND ADMINISTRATION AND ENVIRONMENTAL MANAGEMENT 2, n.º 1 (17 de mayo de 2022): 1–13. http://dx.doi.org/10.54222/afrigist/ajleam/v2i1.1.
Texto completoCyrille-Joseph, ATTA Assemien, KADJO Blaise, SOULEMANE Ouattara y KOUADIO Yao Roger. "Abondance et distribution des buffles Syncerus caffer (Sparrman, 1779) dans le Parc National de la Comoé, Nord-Est de la Côte d’Ivoire". Journal of Animal and Plant Sciences 45, n.º 3 (30 de septiembre de 2020): 8024–37. http://dx.doi.org/10.35759/janmplsci.v45-3.6.
Texto completoDalémat, Marie, Michel Coret, Adrien Leygue y Erwan Verron. "Robustness of the Data-Driven Identification algorithm with incomplete input data". Journal of Theoretical, Computational and Applied Mechanics, 21 de febrero de 2024. http://dx.doi.org/10.46298/jtcam.12590.
Texto completoTesis sobre el tema "Balance de vorticité linéaire"
Cortés, Morales Diego. "Large-scale Vertical Velocities in the Global Open Ocean via Linear Vorticity Balance". Electronic Thesis or Diss., Sorbonne université, 2024. http://www.theses.fr/2024SORUS061.
Texto completoAt oceanic basin scales, vertical velocities are several orders of magnitude smaller than their horizontal counterparts, rendering a formidable challenge for their direct measurement in the real ocean. Therefore, their estimations need a combination of observation-based datasets and theoretical considerations.Historically, scientists have employed various techniques to estimate vertical velocities across different scales constrained by the available observations of their time. Various approaches have been attempted, ranging from methods utilizing in situ horizontal current divergence to those based on intricate omega-type equations. However, the Sverdrup balance has captured the attention of researchers and ours due to its robust and straightforward description of ocean dynamics. One of the fundamental components of the Sverdrup balance is the linear vorticity balance (LVB: βv = f ∂z w). It introduces a novel vertical dimension to the conventional Sverdrup balance, establishing a connection between vertical movement and the meridional transport above it.In order to advance on the theoretical prospect of estimating the vertical velocities, it is primarily identified the annual and interannual timescales patterns governing the linear vorticity balance within an eddy-permitting OGCM simulation. Initially, this analysis is conducted over the North Atlantic Ocean, and subsequently expanded to encompass the entire global ocean, focusing on larger scales than 5 degrees. The analysis revealed the feasibility of computing a robust vertical velocity field beneath the mixed layer using the LVB approach across large fractions of the water column in the interior regions of tropical and subtropical gyres and within some layers of the subpolar and austral circulation. Departures from the LVB occur in the western boundary currents, strong zonal tropical flows, subpolar gyres and smaller scales due to the nonlinearities, mixing and bathymetry-driven contributions to the vorticity budget.The extensive validity of the LVB description of the global ocean provides a relatively simple foundation for estimating the vertical velocities through the indefinite depth-integrated LVB. Using an OGCM, it has demonstrated that the estimates possess the capability to accurately reproduce the time-mean amplitude and interannual variability of the vertical velocity field within substantial portions of the global ocean when compared to the reference model. Here, we build the DIOLIVE (indefinite Depth-Integrated Observation-based LInear Vorticity Estimates) product by applying the observation-based geostrophic velocities from ARMOR3D into the indefinite depth-integrated LVB formalism, with wind stress data from ERA5 serving as boundary condition at the surface. This product contains vertical velocities spanning the global ocean's thermocline at 5 degrees horizontal resolution and 40 isopycnal levels during the 1993-2018 period.A comparative analysis between the DIOLIVE product and four alternative products, including one OGCM simulation, two reanalyses and an observation-based reconstruction based on the omega equation, is conducted using various metrics assessing the vertical circulation's multidimensional features of the ocean vertical flow. The omega equation-based product displays large departures from the synchronicity and baroclinicity reproduced by the validation ensemble. However, in regions where the LVB holds as a valid assumption, the DIOLIVE product demonstrates a remarkable ability to replicate the baroclinic structure of the ocean, exhibiting satisfactory spatial consistency and notable agreement in terms of temporal variability when compared to the two reanalyses and the OGCM simulation
Ménard, Richard. "Saturation d'ondes de gravité et balance non-linéaire". Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=65947.
Texto completoAydi, Hassen. "Vorticité dans le modèle de Ginzburg-Landau de la supraconductivité". Phd thesis, Université Paris XII Val de Marne, 2004. http://tel.archives-ouvertes.fr/tel-00297136.
Texto completoEn première partie, on prouve pour des certeins champs magnétiques appliqués $h_{ex}$ à la surface du supraconducteur de l'ordre du premier champ critique $H_{c_1}=\frac{|\log\e|}{2}$ que pour les minimiseurs périodiques de Ginzburg-Landau, le nombre des vortex par période est de l'ordre de $h_{ex}$ et leur répartition est uniforme. En outre, en prenant des champs $h_{ex}$ proches de $H_{c_1}$ de la forme $h_{ex}=H_{c_1}+f(\e)$ où $f(\e)\rightarrow +\infty$ et $f(\e)=o(|\log\e|)$, on montre que le nombre de vortex des minimiseurs périodiques par période est de l'ordre de $f(\e)$ et leur répartition est aussi uniforme.
Dans une deuxième partie, toujours dans le modèle périodique, on construit une suite de points critiques ayant des vortex répartis sur un nombre fini de lignes horizontales.
Dans une troisième partie, on construit dans le cas d'un disque une suite de points critiques telle que les vortex sont répartis sur un nombre fini de cercles concentriques de rayon strictement positif et de centre, le centre du disque. Dans le cas où il y a un seul cercle de vorticité, le rayon est bien caractérisé.
Finalement, dans un modèle de Ginzburg-Landau avec "pinning", on s'intéresse à l'étude du signe des degrés des vortex et on donne des résultats partiels indiquant que les degrés ne sont pas toujours positifs.
Seez, William. "Rotational, progressive and periodic free-surface waves : determination and stability". Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0130.
Texto completoIn coastal zones, waves propagating at the surface of the ocean are strongly influenced by underlying shear currents. Depth-dependent velocity profiles are generated by wind blowing at the surface and friction at the bed. Considering the Euler equations for an inviscid and incompressible fluid, along with the appropriate free-surface kinematic and dynamic boundary conditions, the interaction between a two-dimensional progressive periodic free-surface wave of permanent form and an underlying current is studied. By not assuming that the velocity field derives from a scalar potential, this work extends the linear, constant vorticity, shear model to velocity profiles defined by a class of exponential vorticity functions. The two-dimensional current profiles are first shown to be linearly stable in the absence of a free-surface perturbation. The influence of the underlying shear on waves of arbitrary amplitude and depth is then studied numerically, both in the absence and presence of capillarity. Although the celerity and potential and kinetic energy of the wave are strongly influenced by the nonlinear wave steepness parameter, the effect of vorticity is shown to be non-negligible, especially for pure gravity waves. Finally, results are presented for a linear stability analysis of these finite amplitude (2D) waves under three-dimensional perturbations. It is found that the classical classes of instability corresponding to four and five wave resonances are recovered in three-dimensions in the presence of constant or depth-dependent vorticities. Finally, a mechanism is proposed for the dominant three-dimensional instability caused by the presence of an underlying shear current
Viana, Serra Villa Cristiano. "Dynamique non linéaire des rotors : Applications numériques et expérimentales à un rotor flexible". Ecully, Ecole centrale de Lyon, 2005. http://bibli.ec-lyon.fr/exl-doc/cvilla.pdf.
Texto completoThis thesis deals with the dynamic behavior of rotating machinery containing the parts whose behavior is described by non linear laws. The first goal of this research is to implement methods of non linear analysis in order to solve the equations of motion of the system. Secondly, experimental studies are made with a test rig and the results are used to update a numeric model. The rotor is represented by a finite element model. To model the bearings, three models with different levels of complexity are presented, and a model where the kinematics of the rolling elements is adopted. The type of motion of interest is the steady state vibration, and to obtain this kind of solution it is advisable to use a frequential method like the Harmonic Balance Method Alternating Frequency Time (HBM AFT). This method can be implemented with an exact condensation strategy to reduce the computational time. The HBM AFT method is validated by comparing with a direct integration of a non linear Jeffcott rotor
Rojas, René. "Sur des Gouttes, Cristaux Liquides et Front". Phd thesis, Université de Nice Sophia-Antipolis, 2005. http://tel.archives-ouvertes.fr/tel-00129102.
Texto completoLa seconde partie est consacrée à l'étude d'une goutte déposée adiabatiquement sur un solvant plus dense. La goutte tombe dans le solvant jusqu'à une hauteur minimale, ensuite la fragmentation a lieu et les gouttelettes secondaires remontent à la surface. On a developpé un modèle théorique qui inclut l'essentiel du phénomène et prédit les échelles correctes du temps de montée et de la hauteur minimale.
La troisième partie concerne l'étude linéaire du modèle de la valve à cristaux liquides avec rétro-action optique. Elle permet de comprendre un nouveau type de structures localisées qui apparaissent comme des pics isolés sur une structure spatiale de plus faible amplitude.
Meurdefroid, Anthony. "Dynamique des structures assemblées - Amortissement non linéaire". Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPAST029.
Texto completoThis thesis is part of work related to the problems of assembled structures. After an analysis and a synthesis of the different modeling scales involved in order to determine the damping in the joints, the manuscript highlights the scales changes, i.e. model reductions. Many numerical methods are used to solve nonlinear vibration problems. The framework of the thesis being steady-state vibrations, the Harmonic Balance Method is commonplace. Here it is coupled with an original fixed point algorithm. Depending on the case study, three resolution paths are proposed. If we know everything about the behavior, the study of the complete structure can be summarized to the resolution of a differential system. The question is "how to solve it efficiently?" A comparison of four different formulations of the same problem in the time and frequency domains, with or without the regularization of hysterical forces, provides answers to this question. If this is not possible or unreasonable, then one must try to decompose the problem. One way to speed up the process is to reduce the model. For this purpose a new basis for reducing the non-linear part is introduced. Its construction is based on an energy indicator and its use is based on a chart. Finally, if the construction of this chart is impossible, it is then necessary to have a complete computation with sequential generations of dynamic charts of the sub-structure. This adaptive methodology alternates the time and frequency resolutions respectively on non-linear and linear domains in a non incremental way
Jaumouillé, Vincent. "Dynamique des structures à interfaces non linéaires : Extension des techniques de balance harmonique". Phd thesis, Ecole Centrale de Lyon, 2011. http://tel.archives-ouvertes.fr/tel-00670283.
Texto completoMaach, Fatna. "Existence pour des systèmes de réaction-diffusion ou quasi linéaires avec loi de balance". Nancy 1, 1994. http://www.theses.fr/1994NAN10121.
Texto completoThomas, Roland. "L'instabilité modulationnelle en présence de vent et d'un courant cisaillé uniforme". Phd thesis, Aix-Marseille Université, 2012. http://tel.archives-ouvertes.fr/tel-00716089.
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