Academic literature on the topic 'Méthode d’inversion'
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Journal articles on the topic "Méthode d’inversion":
Assani, Ali A., Francis Lajoie, and Charles Laliberté. "Impacts des barrages sur les caractéristiques des débits moyens annuels en fonction du mode de gestion et de la taille des bassins versants au Québec." Revue des sciences de l'eau 20, no. 1 (May 7, 2007): 127–46. http://dx.doi.org/10.7202/015741ar.
Assani, A. A., É. Gravel, T. Buffin-Bélanger, and A. G. Roy. "Impacts des barrages sur les débits annuels minimums en fonction des régimes hydrologiques artificialisés au Québec (Canada)." Revue des sciences de l'eau 18, no. 1 (April 12, 2005): 103–27. http://dx.doi.org/10.7202/705552ar.
Dlugos, Kayla V., Kateryna Maksyutynska, Luke T. Kyne, Tianna Costa, and Tony P. George. "Peer-administered Naloxone for Preventing Opioid Overdose: A Scoping Review." Canadian Journal of Addiction 15, no. 1 (March 2024): 37–49. http://dx.doi.org/10.1097/cxa.0000000000000202.
Ben Hassen, F., Y. Boukari, and H. Haddar. "Inverse impedance boundary problem via the conformal mapping method: the case of small impedances." Revue Africaine de la Recherche en Informatique et Mathématiques Appliquées Volume 13 - 2010 - Special... (August 26, 2010). http://dx.doi.org/10.46298/arima.1936.
Auroux, D., L. Jaafar-Belaid, and B. Rjaibi. "Application of the topological gradient method to tomography." Revue Africaine de la Recherche en Informatique et Mathématiques Appliquées Volume 13 - 2010 - Special... (September 30, 2010). http://dx.doi.org/10.46298/arima.1939.
Wilson, Andrew Timothy. "An extension of MacMahon's Equidistribution Theorem to ordered multiset partitions." Discrete Mathematics & Theoretical Computer Science DMTCS Proceedings vol. AT,..., Proceedings (January 1, 2014). http://dx.doi.org/10.46298/dmtcs.2405.
Dissertations / Theses on the topic "Méthode d’inversion":
Ouloin, Martyrs. "Méthode d’inversion d’un Modèle de diffusion Mobile Immobile fractionnaire." Thesis, Avignon, 2012. http://www.theses.fr/2012AVIG0504/document.
Appealing models for mass transport in porous media assume that fluid and tracer particles can be trapped during random periods. Among them, the fractional version of the Mobile Immobile Model (f-MIM) was found to agree with several tracer test data recorded in environmental media.This model is equivalent to a stochastic process whose density probability function satisfies an advection-diffusion equation equipped with a supplementary time derivative, of non-integer order. The stochastic process is the hydrodynamic limit of random walks accumulating convective displacements, diffusive displacements, and stagnation steps of random duration distributed by a stable Lévy law having no finite average. Random walk and fractional differential equation provide complementary simulation methods.We describe that methods, in view of having tools for comparing the model with tracer test data consisting of time concentration curves. An other essential step in this direction is finding the four parameters of the fractional equation which make its solutions fit at best given sets of such data. Hence, we also present an inversion method adapted to the f-MIM. This method is based on Laplace transform. It exploits the link between model's parameters and Laplace transformed solutions to f-MIM equation. The link is exact in semi-infinite domains. After having checked inverse method's efficiency for numerical artificial data, we apply it to real tracer test data recorded in non-saturated porous sand
Zein, Samih. "Application des méthodes d’optimisation stochastiques à deux problèmes d’inversion sismique." Rennes 1, 2007. http://www.theses.fr/2007REN1S043.
In this thesis we are interested in solving two seismic inverse problems using Monte Carlo type methods. The first problem is on estimating the density and the Lamé's coefficients of a thin layered solid from measures of the pressure variation due to the propagation of a seismic wave. We use MCMC and SPSA methods and a finite elements code to perform the inversion. We give an estimation of the treshold of the noise in the pressure measures with respect to the condition number of the jacobien of the foward problem. The second inverse problem is on the estimation of the wave's velocity from the seismic traveltime measures. We propose a reduction of the computations time by taking a formulation that avoids seeking the rays that are hard to find. We use the genetic algorithms and the ray tracing technique. We study the robustness of the solution by doing a SVD of the jacobien to find the solution
Di, Nunno Palma. "Réfléchir Bergson. Moments de retournements, d’inversion et de conversion dans l’œuvre bergsonienne." Thesis, Paris 4, 2012. http://www.theses.fr/2012PA040186.
Such terms as « retournement », « renversement », « inversion », « conversion » etc. belong to a recurrent lexicon in Bergson’s works. The frequent presence in his writings of these words, and related adjectives and verbs, announces our departing point. Its from this lexicon that we move to unveil our reading of Bergson through a filter which, first of all, must be well calibrated. Thus, an image arises, one that we must take, at first, with a certain vagueness, considering it « image médiatrice »; an image which then clarifies itself as «centrale» or «primitive», from which other images radiate. Looking for the style of thought, through moments of writings more then themes, we cover Bergson’s major works to uncover moments of change, whether proposed by the philosopher in his doctrine, or traceable in the practice of thought, its exercise, or, in other words, the application of the method. A major difficulty comes forth, unsolved, but full of fruitful tension: the paradox of expressing the inexpressible entwines itself with that of exploring bergsonism with its language of expression as a starting point. This path, dotted with impasses, will take us to the identification of two principal moments: a moment of subjective-epistemological reversal and an ontological-metaphysical one. The first one applies to the subject and its existential dimension (read behavior) in strained relationship with the philosophical method as inversion of the spontaneously practical destination of intelligence. The second one touches directly the doctrine and, in particular, the theory of perception in Matière et mémoire as well as the genesis of materiality and intellectuality in L’évolution créatrice. It’s in the 1907 work and its possible extensions (which we only glance at), that we also find the correspondence and complication of the two moments. With these we achieve the final image of an invertible chord through which Bergson’s philosophy resounds
Bouchoucha, Mohamed Khalil. "Méthode de conception basée sur le coefficient d’inversion pour l’optimisation énergétiques des circuits RF et millimétrique, en technologie 28 nm FD-SOI CMOS." Electronic Thesis or Diss., Université Grenoble Alpes, 2024. http://www.theses.fr/2024GRALT026.
In response to the flourishing market demands for the new generation of IoT devices, thiswork addresses the design and optimization of Low Noise Amplifiers (LNAs). The LNAsserves as the main building block of low-power LNA-first sub-6GHz receivers dedicated to5G Long-Term Evolution for machines (LTE-M) and Narrowband IoT (NB-IoT) cellularstandards. Recognizing the escalating challenges in ultra-low power IoT device connectivity, the significance of optimizing LNAs lies in enhancing overall receiver performanceand meeting the strict low noise and reduced power budget requirements of LTE-M andNB-IoT applications. Besides, it requires the utilization of cost-efficient, high-performing,and extensively integrated technology for Very Large Scale Integration. In this thesis, weemploy the 28 nm FD-SOI CMOS technology provided by STMicroelectronics.To improve power efficiency, the LNA is designed using a comprehensive analyticalmethodology. This methodology leverages the transistor inversion level as a key designparameter, providing insights into the design space. Employing a proposed simple 6-parameter advanced compact model (ACM) introduced in this work, applicable acrossall transistor regions and operation regimes, the methods enable preliminary LNA sizingthrough analytical equations. This simple model, an adaptation of previous ACM versionsaccommodating various physical parameters, is made suitable for both bulk and FD-SOItechnology, incorporating a fourth terminal.The primary contribution lies in the design of a wideband, low-noise sub-6GHz tunable multimode inductorless LNA, utilizing an active gm-boosting Common-Gate (CG)architecture. Tunability is achieved through discrete coarse mode selection and continuous fine-tuning the back-gate of FD-SOI CMOS technology, showcasing the adaptabilityof body-bias for finely tunable architectures, specifically addressing the dynamic demandsof IoT environments.The transistor model, coupled with the analytical LNA description, guides the designalgorithm, exploring various performance trade-offs against the specified requirements.Implemented in STMicroelectronics’ 28 nm FD-SOI CMOS Technology with an activearea of 0.0059 mm2, the measured performance demonstrates over 30 dB voltage gainwith a dynamic range exceeding 20 dB across modes for a frequency range of 400 MHzto 5 GHz. The noise figure (NF) varies from a stringent value of 1.8 dB to 7 dB, while the Input-referred third-order Intercept Point (IIP3) spans from -24.5 dBm to -6.5 dBmbased on the selected mode. The maximum power consumption is 1.86 mW from a 0.9 Vsupply. Fine-tuning the LNA performances across modes achieves extensive coverage ofthe design space.Furthermore, the proposed design methodologies are applied to different LNA architectures, including Resistive feedback common-source, common-gate, and gm-boost common gate LNAs, showcasing the simplicity and applicability of the analytical approach in addressing diverse design scenarios. This paves the way to future energy-efficient implementations targetting ULP ULV IoT receiver front-end solutions
Acikgoz, Hulusi. "Technique d'inversion associant la modélisation numérique et les réseaux de neurones pour la caractérisation micro-ondes de matériaux." Paris 6, 2008. http://www.theses.fr/2008PA066387.
Thouin, Emmanuelle. "L’étude de performances d’une nouvelle technique d’imagerie flash laser : l’imagerie flash laser mosaïque." Thesis, Toulouse, ISAE, 2015. http://www.theses.fr/2015ESAE0017/document.
Flash active imaging can be used for surveillance or target identification at long range and Iow visibility conditions. Its principle is based on the illumination of a scene With a pulsed laser which is then backscattered to the sensor. The signal to noise ratio and contrast of the object over the background are increased in comparison With passive imaging. Even though, range and field of view (FOV) are limited for a given laser power. The new active imaging system presented here aims at vercoming this limitation. It acquires the entire scene With a high-speed scanning laser illumination focused on a limited region, whereas at each scan the full frame active image is acquired. The whole image is then reconstructed by mosaicking Il these successive images. A evaluation of the performance of this system is conducted by using a direct physical model of his so-called « mosaic active imaging ». This End to End model, realistic in terms of turbulence effects (scintillation, beam andering.. gives us a sequence of images a synthetic scenes. After describing this model, the reconstruction method will be described. It is based on a total-variation minimization scheme. Finally, the performances of this new concept are ompared to those of a conventional flash active camera by using usual metrics (Johnston's criteria, SNR, ...). For va rious mean laser powers, we quantify the gains expected in terms of range and field of view of this new concept
Zaugg, Louis. "Apport de l'imagerie hyperspectrale pour la caractérisation optique des eaux issues de rejets industriels." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPAST026.
Investigating the application of remote sensing to water pollution in industrial ponds is of great interest for rapid and cost-effective pollution monitoring. This study presents a method to detect pollutants and map their spatial distribution in industrial ponds using the water inherent optical properties (IOPs), namely the absorption and backscattering coefficients, derived from hyperspectral imaging. The IOPs of industrial water pollutants remain poorly known. Current remote sensing methods are site-specific and require in situ measurements to calibrate empirically-based models. Here, a generic approach is proposed based on the semi-analytical radiative transfer model by Lee et al. (1998) adapted to take into account both the absorption and backscattering coefficients of pollutant particles. The model is then inverted using an alternating multi-pixel method, named IWOC (Industrial Wastewater Optical Characterization), to map the spatial distribution of the pollutants. The performances of IWOC are evaluated using noise-free and noisy simulated datasets for natural waters, absorption-dominated water cases and backscattering-dominated water cases. The performances of the IWOC method are also examined through hyperspectral airborne images acquired over relevant study areas. The approach conducted in this study is a first step towards a generic inversion method for the optical characterization of in waters from industrial discharges and pollution in water. Further research could lead to an operational method
Pluriel, William. "Effets de la structure tridimensionnelle des atmosphères d’exoplanètes chaudes sur les observations et les modèles d’inversion de données." Thesis, Bordeaux, 2020. http://www.theses.fr/2020BORD0167.
Nowdays, we are able to discover more and more exoplanets, and even more important we can observe their atmospheres and we are starting to get information on their physical, dynamic and, chemical properties. With the new generation of space telescopes such as the JWST or Ariel, we will be able to observe spectral features that are now unobservable. However, during transit observations, the geometric structure of the atmospheres, and in particular the day to night dichotomy of hot and ultra hot Jupiters, affects the transmission spectrum and generates biases in the interpretations of retrieval outputs analysis.The aim of my thesis is to study the effects of the three-dimensional structure of exoplanet atmospheres, and in particular the hottest ones, in order to determine the importance and the origin of these biases to allow a better analysis of the spectral data. I set up a numerical experiment simulating observations of hot Jupiters where I control the entire observational chain, from the atmosphere's simulation to the retrieval. In addition, I analyzed observations of Kelt-7 b, a hot Jupiter, from the Hubble Space Telescope, to link my numerical analysis to real data.My work has shown that the particular structure of the hottest Jupiters significantly affects observations, implying significant biases in the results of 1D retrieval models. Although these models are valid over a large range of planets, I have demonstrated that for the hottest exoplanets, they are unable to find the abundances of species. I succeeded in quantifying these biases and in understanding their origins, hence an improvement in the interpretation of future results from 1D retrieval models. Furthermore, I conclude that it is necessary to develop 2D retrieval models to try to resolve these biases
Vernet, Kinson. "Imagerie densitométrique 3D des volcans par muographie." Electronic Thesis or Diss., Université Clermont Auvergne (2021-...), 2022. http://www.theses.fr/2022UCFAC112.
Muography is an imaging technique in particle physics where atmospheric muons passing through a target are used to determine information about the interior of the target : density distribution or chemical composition via the atomic number. Depending on the energy of the muons and the amount of matter they have to cross, some of them will survive and others will be stopped by the target. And, the diffusion of the muons depends, to a first approximation, on their momentum and the average atomic number along their flight path. Muography proposes, from the measurement of the transmission and/or diffusion of muons through a target, to provide information about its interior.There are currently two types of muography : transmission muography, where the transmitted flux of muons through the target is measured to infer the density distribution of that target, and diffusion muography, where the diffusion of muons through the target is used to determine the distribution of the atomic number of the target. This thesis discusses transmission muography in order to radiography volcanoes.In the case of transmission muography, a muon telescope is used to measure the transmitted flux of atmospheric muons through the target. This flux is, to a first approximation, a bijective function of the amount of matter encountered by the muons. The idea is to invert the measured number of muons into a density estimation of the target.There are other imaging methods in geophysics that can be used to reconstruct the density of a target. This is the case, for example, of gravimetry and seismic imaging. These so-called conventional methods have weaknesses. For these methods, the inversion problem is either ill-posed, i.e. there is no unique solution, or the solution presents large variations for small variations of the parameters on which it depends. A set of additional constraints are then added to remove the non-uniqueness.In muography however, the inversion problem is well posed and the solution is unique. Conventional geophysical methods alone cannot determine the density of a target. Combined with muography, they have great potential, either by providing other information on the rock and/or on the nature of the water, or by improving the accuracy of the target density reconstruction.Several experiments use the CSDA (Continuous Slowing Down Approximation) approximation to estimate the survival probability of muons through a target. Using this approximation, thus neglecting the stochastic character of the interaction of muons with matter, underestimates the muon survival probability and therefore induces systematic effects on the density reconstruction. In standard rock kilometers the effect is 3% - 8% depending on the modeling of the interaction of high energy muons with matter. In addition, a bad estimation of the background of the low momentum muons affecting the measurement of the signal results in an underestimation of the density of the target with respect to the gravimetry. This probably comes from the use of the analytical approximation to simulate the propagation of the muons through the target and the difficulty of rejecting in the measurement those with low momentum. For these reasons, in the Muon IMaging (MIM) experiment (where this thesis was conducted), we use a Monte Carlo treatment to simulate the muon transport through the target. In this case, we can accurately estimate the effet of these low momentum muons on the density reconstruction. One of the techniques used in our experiment, to make the low momentum muons scatter so that they can be statistically rejected, is to insert a thickness of lead between the telescope detection planes. (...)
Book chapters on the topic "Méthode d’inversion":
LÉONARD, Jean Léo. "Les ateliers thématiques de Méthodologie en Anthropologie Sociale Critique (MASC)." In Linguistique pour le Développement, 47–70. Editions des archives contemporaines, 2022. http://dx.doi.org/10.17184/eac.5244.
GESRET, Alexandrine. "Méthodes d’inversion probabiliste." In Inversion et assimilation de données de télédétection, 203–36. ISTE Group, 2023. http://dx.doi.org/10.51926/iste.9142.ch6.