Relevant bibliographies by topics / Intervalles temporels flous

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Intervalles temporels flous'

Author: Grafiati
Published: 4 June 2021
Last updated: 2 February 2022

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Journal articles on the topic "Intervalles temporels flous"

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Geoga, Christopher J., Charlotte L. Haley, Andrew R. Siegel, and Mihai Anitescu. "Frequency–wavenumber spectral analysis of spatio-temporal flows." Journal of Fluid Mechanics 848 (June 8, 2018): 545–59. http://dx.doi.org/10.1017/jfm.2018.366.

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We propose a fully spatio-temporal approach for identifying spatially varying modes of oscillation in fluid dynamics simulation output by means of multitaper frequency–wavenumber spectral analysis. One-dimensional spectrum estimation has proven to be a valuable tool in the analysis of turbulence data applied spatially to determine the rate of energy transport between spatial scales, or temporally to determine frequencies of oscillatory flows. It also allows for the quantitative comparison of flow characteristics between two scenarios using a standard basis. It has the limitation, however, that
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Balakrishna, Ramachandran, and Haris N. Koutsopoulos. "Incorporating within-Day Transitions in Simultaneous Offline Estimation of Dynamic Origin-Destination Flows without Assignment Matrices." Transportation Research Record: Journal of the Transportation Research Board 2085, no. 1 (2008): 31–38. http://dx.doi.org/10.3141/2085-04.

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An offline methodology is presented: it simultaneously estimates dynamic origin-destination (O-D) matrices, without using assignment matrices that incorporate within-day transition equations. The proposed formulation and solution approach extends a calibration method recently developed that directly uses the output of any network loading model (such as a dynamic traffic assignment or simulation model) so that the complex relationships between O-D flows and model outputs are accurately captured (as opposed to the more common method of approximate linear relationships based on the assignment mat
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3

GIBBON, J. D., and Charles R. DOERING. "Intermittency in solutions of the three-dimensional Navier–Stokes equations." Journal of Fluid Mechanics 478 (March 10, 2003): 227–35. http://dx.doi.org/10.1017/s0022112002003555.

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Dissipation-range intermittency was first observed by Batchelor & Townsend (1949) in high Reynolds number turbulent flows. It typically manifests itself in spatio-temporal binary behaviour which is characterized by long, quiescent periods in the signal which are interrupted by short, active ‘events’ during which there are large excursions away from the average. It is shown that Leray's weak solutions of the three-dimensional incompressible Navier–Stokes equations can have this binary character in time. An estimate is given for the widths of the short, active time intervals, which decreases
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Bakhoum, Ezzat G., and Cristian Toma. "Modeling Transitions in Complex Systems by Multiplicative Effect of Temporal Patterns Extracted from Signal Flows." Mathematical Problems in Engineering 2012 (2012): 1–11. http://dx.doi.org/10.1155/2012/409856.

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This study presents a mathematical model based on Fourier decomposition of a sequence of internal signals generated in a complex system by a sequence of external pulses (time series) for characterizing suddenly emerging phenomena as nonlinear transitions. Newly created temporal patterns extracted from internal signal flow (mathematically represented as oscillations with long period) interact as new entities in a multiplicative manner with subsequent pulses from the external time series (already existing entities) in order to generate nonlinear transitions within the system. Such effects are en
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5

Nakamura, R., W. Baumjohann, T. L. Zhang, et al. "Cluster and Double Star observations of dipolarization." Annales Geophysicae 23, no. 8 (2005): 2915–20. http://dx.doi.org/10.5194/angeo-23-2915-2005.

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Abstract. We studied two types of dipolarization events with different IMF conditions when Cluster and Double Star (TC-1) were located in the same local time sector: 7 August 2004, 18:00-24:00 UT, during a disturbed southward/northward IMF interval, and 14 August 2004, 21:00-24:00 UT, when the IMF was stably northward. Cluster observed dipolarization as well as fast flows during both intervals, but this was not the case for TC-1. For both events the satellites crossed near the conjugate location of the MIRACLE stations. By using multi-point analysis techniques, the direction/speed of the propa
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6

Sandholt, P. E., and C. J. Farrugia. "Plasma flows, Birkeland currents and auroral forms in relation to the Svalgaard-Mansurov effect." Annales Geophysicae 30, no. 5 (2012): 817–30. http://dx.doi.org/10.5194/angeo-30-817-2012.

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Abstract. The traditional explanation of the polar cap magnetic deflections, referred to as the Svalgaard-Mansurov effect, is in terms of currents associated with ionospheric flow resulting from the release of magnetic tension on newly open magnetic field lines. In this study, we aim at an updated description of the sources of the Svalgaard-Mansurov effect based on recent observations of configurations of plasma flow channels, Birkeland current systems and aurorae in the magnetosphere-ionosphere system. Central to our description is the distinction between two different flow channels (FC 1 and
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7

ERN, PATRICIA, and JOSÉ EDUARDO WESFREID. "Flow between time-periodically co-rotating cylinders." Journal of Fluid Mechanics 397 (October 25, 1999): 73–98. http://dx.doi.org/10.1017/s0022112099006059.

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We consider oscillatory flows between concentric co-rotating cylinders at angular velocity Ω(t) = Ωm + Ωo cos ωt as a prototype to investigate the competing effects of centrifugal and Coriolis forces on the flow stability. We first study by flow visualization the effect of the mean rotation Ωm on the centrifugal destabilization due to the temporal modulation. We show that increasing the mean rotation first destabilizes and then restabilizes the flow. The instability of the purely azimuthal basic flow is then analysed by investigating the dynamics of the axial velocity component of the vortex s
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8

Sandholt, P. E., Y. L. Andalsvik, and C. J. Farrugia. "The pulsed nature of the nightside contribution to polar cap convection: repetitive substorm activity under steady interplanetary driving." Annales Geophysicae 30, no. 10 (2012): 1539–53. http://dx.doi.org/10.5194/angeo-30-1539-2012.

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Abstract. The aim of this study is to investigate the relative contributions of dayside and nightside processes to the spatial and temporal structure of polar cap plasma convection. The central parameter is the cross-polar cap potential (CPCP). Selecting a 10-h-long interval of stable interplanetary driving by an interplanetary CME (ICME), we are able to distinguish between the dayside and nightside sources of the convection. The event was initiated by an abrupt enhancement of the magnetopause (MP) reconnection rate triggered by a southward turning of the ICME magnetic field. This was followed
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Wang, Tianyu, Sarah T. Gille, Matthew R. Mazloff, Nathalie V. Zilberman, and Yan Du. "Numerical Simulations to Project Argo Float Positions in the Middepth and Deep Southwest Pacific." Journal of Atmospheric and Oceanic Technology 35, no. 7 (2018): 1425–40. http://dx.doi.org/10.1175/jtech-d-17-0214.1.

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AbstractArgo float trajectories are simulated in the southwest Pacific basin (25°–45°S, 170°E–165°W) using velocity fields from a 1/12° Southern Ocean model and a Lagrangian particle tracking model programmed to represent the vertical motions of profiling Argo floats. The system is applied to simulate both core Argo floats (typically parked at 1000-m depth and profiling to 2000-m depth) and Deep Argo floats (parked 500 m above the seafloor). The goal is to estimate probability density functions (PDFs) predicting future float positions. Differences are expected in the trajectory statistics, lar
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10

HALPERN, DAVID, and ALEXANDER L. FRENKEL. "Saturated Rayleigh–Taylor instability of an oscillating Couette film flow." Journal of Fluid Mechanics 446 (October 23, 2001): 67–93. http://dx.doi.org/10.1017/s0022112001005596.

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The nonlinear stability of a two-fluid system consisting of a viscous film bounded above by a heavier and thicker layer, between two horizontal plates, with one of the plates oscillating horizontally about a fixed position, is investigated. An evolution equation governing the thickness of the viscous film is derived. Numerical simulations of this equation on extended spatial intervals demonstrate nonlinear small-amplitude saturation of the Rayleigh–Taylor instability in certain parametric regimes. In the low-frequency time-asymptotic regimes, the averaged properties of the extensive spatio-tem
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Dissertations / Theses on the topic "Intervalles temporels flous"

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Gammoudi, Aymen. "Contribution à l'étude de l'exploitation des données temporelles en présence d'imperfections." Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2017. http://www.theses.fr/2017ESMA0008/document.

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Ce travail de thèse porte sur l’exploitation des données temporelles en présence d’imperfections. Il s’agit de définir, concevoir et développer un système intelligent pour l’interrogation des bases de données temporelles où la dimension temps (des relations ou des entités) est définie d’une manière imprécise et floue. Ce type de base de données se manifeste fréquemment dans les applications issues du domaine médical, de l’historique et de l’archive, de la planification, etc.Nous rappelons tout d’abord les différents formalismes utilisés dans le traitement des informations temporelles, puis, no
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Book chapters on the topic "Intervalles temporels flous"

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"Hudson River Fishes and their Environment." In Hudson River Fishes and their Environment, edited by Nina F. Caraco and Jonathan J. Cole. American Fisheries Society, 2006. http://dx.doi.org/10.47886/9781888569827.ch5.

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<em>Abstract.—</em>Organic material can enter aquatic systems by de novo gross primary production (GPP) from inorganic carbon within the system (autochthonous sources) or by import from the surrounding watershed and upstream aquatic systems (allochthonous sources). We analyzed the spatio–temporal variation in these two organic carbon sources for the 150-km long tidal freshwater Hudson during 2 years (1999 and 2000). Gross primary production was calculated from dawn– dusk sampling at 2-km intervals over the length of the Estuary for dissolved oxygen, pH, and DIC. Allochthonous inputs (All) were also calculated for the same periods based on organic carbon measurements and hydrologic flows. The relative importance of these two organic carbon sources (GPP/All) varied by over 30-fold across space and time. This variation was related to hydrologic inputs; on average 1999 (the second driest summer in the past 15 years) had 10- fold greater GPP/All than did 2000 (the wettest summer in 15 years). Associated with the high GPP/All in 2000 there was higher carbon dioxide supersaturation and net heterotrophy as compared to 1999. We suggest that hydrologically driven variation in GPP/All may also impact the food web and the dominant organic carbon source for fish and invertebrate consumers in the river. Natural abundance <sup>14</sup>C measurements could potentially trace these two food sources as they vary in space and time.
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"Hudson River Fishes and their Environment." In Hudson River Fishes and their Environment, edited by Nina F. Caraco and Jonathan J. Cole. American Fisheries Society, 2006. http://dx.doi.org/10.47886/9781888569827.ch5.

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<em>Abstract.—</em>Organic material can enter aquatic systems by de novo gross primary production (GPP) from inorganic carbon within the system (autochthonous sources) or by import from the surrounding watershed and upstream aquatic systems (allochthonous sources). We analyzed the spatio–temporal variation in these two organic carbon sources for the 150-km long tidal freshwater Hudson during 2 years (1999 and 2000). Gross primary production was calculated from dawn– dusk sampling at 2-km intervals over the length of the Estuary for dissolved oxygen, pH, and DIC. Allochthonous inputs (All) were also calculated for the same periods based on organic carbon measurements and hydrologic flows. The relative importance of these two organic carbon sources (GPP/All) varied by over 30-fold across space and time. This variation was related to hydrologic inputs; on average 1999 (the second driest summer in the past 15 years) had 10- fold greater GPP/All than did 2000 (the wettest summer in 15 years). Associated with the high GPP/All in 2000 there was higher carbon dioxide supersaturation and net heterotrophy as compared to 1999. We suggest that hydrologically driven variation in GPP/All may also impact the food web and the dominant organic carbon source for fish and invertebrate consumers in the river. Natural abundance <sup>14</sup>C measurements could potentially trace these two food sources as they vary in space and time.
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Conference papers on the topic "Intervalles temporels flous"

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Uesawa, Shin-ichiro, Akiko Kaneko, and Yutaka Abe. "Measurement of Void Fraction in Dispersed Bubbly Flow With Constant Electric Current Method." In 2012 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/icone20-power2012-54510.

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Void fraction is one of important physical values for gas-liquid two-phase flow in nuclear power plants, and it is an essential parameter for designs and performance evaluations of devices, including a core of BWR and so on. Therefore void fraction measurement with real time, high temporal resolution and high spatial resolution has been needed. In several void fraction measurement methods, electric measurement methods of void fraction can realize real-time measurement. In previous studies, conductance methods capacitance methods, wire mesh methods and tomography techniques have been studied. I
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