Дисертації з теми "Dépendance spectrale"
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Cuberos, Andres. "Modélisation de la dépendance et estimation du risque agrégé." Thesis, Lyon 1, 2015. http://www.theses.fr/2015LYO10321/document.
This thesis comprises three essays on estimation methods for the dependence between risks and its aggregation. In the first essay we propose a new method to estimate high level quantiles of sums of risks. It is based on the estimation of the ratio between the VaR (or TVaR) of the sum and the VaR (or TVaR) of the maximum of the risks. We use results on regularly varying functions. We compare the efficiency of our method with classical ones, on several models. Our method gives good results when approximating the VaR or TVaR in high levels on strongly dependent risks where at least one of the risks is heavy tailed. In the second essay we propose an estimation procedure for the distribution of an aggregated risk based on the checkerboard copula. It allows to get good estimations from a (quite) small sample of the multivariate law and a full knowledge of the marginal laws. This situation is realistic for many applications. Estimations may be improved by including in the checkerboard copula some additional information (on the law of a sub-vector or on extreme probabilities). Our approach is illustrated by numerical examples. In the third essay we propose a kernel based estimator for the spectral measure density of a bivariate distribution with regular variation. An extension of our method allows to estimate discrete spectral measures. Some convergence properties are obtained
Kodia, Banzouzi Bernédy Nel Messie. "Mesures de dépendance pour une modélisation alpha-stable : application aux séries chronologiques stables." Toulouse 3, 2011. http://thesesups.ups-tlse.fr/1468/.
This thesis is a contribution to the study of the dependence between heavy tails random variables, and especially symmetric a-stable random variables, by introducing a new coefficient of dependence: the signed symmetric covariation coefficient. We use this coefficient and the generalized association parameter introduced by Paulauskas (1976), in the context of time series, for Identification of MA and AR stable processes. In the first chapter, we give an overview of a-stable laws. We recall the basic concepts, some representations of associated random variables in both the univariate and multivariate cases. The spectral measure carries all the information about the dependence structure of an a-stable random vector. Its form is given for two sub-families of laws : the sub-Gaussian random vectors and linear combinations of independent random variables. Covariation and codifference are presented. We introduce the signed symmetric covariation coefficient in the second chapter. This coefficient has most of the properties of the correlation coefficient of Pearson. In the case of sub-Gaussian random vectors, it coincides with the generalized association parameter. The consistency of the proposed estimators for these quantities is demonstrated. The results of a study on the asymptotic behavior of estimators are presented. In the third chapter, we introduce the concepts of signed symmetric autocovariation and generalized auto-association for linear stationary processes. We use these coefficients for identifying the order of a MA stable process. We propose a statistic acting as a partial autocorrelation coefficient. We compare this statistic with quadratic statistics asymptotically invariant based on the ranks and used by Garel and Hallin (1999) for the identification of AR stables. A study of the results is performed using simulations
Lavancier, Frédéric. "Les champs aléatoires à longue mémoire." Lille 1, 2005. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2005/50376-2005-Lavancier.pdf.
Fermín, Lisandro. "Agrégation de processus stochastiques, désagrégation et longue mémoire." Paris 11, 2008. http://www.theses.fr/2008PA112120.
This thesis is devoted to three closely related problems. The first one is the aggregation of doubly stochastic processes. The second one is about obtaining a long memory processes through the aggregation of short memory processes. The third one is the inverse problem of aggregation, which we shall call disaggregation. We star by studying the aggregation of doubly stochastic linear processes with interactive innovations and we develop a novel SLLN for random quadratic forms of U-statistic which implies the a. S. Convergence of the covariance function of the partial aggregation process. Then, we extend the aggregation convergence results for some doubly stochastic nonlinear processes considering common innovations and weakly dependent innovations. In this last setting we introduce a new weak dependence notion for doubly stochastic processes and we exhibit several models satisfying this notion. In a second part we study the aggregation and the disaggregation of autoregressive processes. Mixture of spectral densities with random poles is the main tool. This tool is useful to build long memory processes by aggregation. Finally, we study the disaggregation on the class of short memory processes whose spectral densities are infinitely differentiable. We prove that a large set of long memory processes are obtained by an aggregation procedure involving these processes
Berrue, Jacques. "Contribution à l'etude de la diffusion de la lumière : étude spectrale de la diffusion collisionnelle, de la dépendance en densité des taux de diffusion et mise au point d'une méthode optique de détermination des équations d'état." Angers, 1986. http://www.theses.fr/1986ANGE0004.
Billa, Bertrand. "Le spectre hertzien, dépendance du domaine public." Toulouse 1, 2006. http://www.theses.fr/2006TOU10005.
Ranarijaona, Zo Alain. "Étude des écarts à l'équilibre thermique dans les plasmas d'arc." Toulouse 3, 2011. http://thesesups.ups-tlse.fr/1472/.
This thesis is a contribution to the study of the dependence between heavy tails random variables, and especially symmetric a-stable random variables, by introducing a new coefficient of dependence: the signed symmetric covariation coefficient. We use this coefficient and the generalized association parameter introduced by Paulauskas (1976), in the context of time series, for Identification of MA and AR stable processes. In the first chapter, we give an overview of a-stable laws. We recall the basic concepts, some representations of associated random variables in both the univariate and multivariate cases. The spectral measure carries all the information about the dependence structure of an a-stable random vector. Its form is given for two sub-families of laws : the sub-Gaussian random vectors and linear combinations of independent random variables. Covariation and codifference are presented. We introduce the signed symmetric covariation coefficient in the second chapter. This coefficient has most of the properties of the correlation coefficient of Pearson. In the case of sub-Gaussian random vectors, it coincides with the generalized association parameter. The consistency of the proposed estimators for these quantities is demonstrated. The results of a study on the asymptotic behavior of estimators are presented. In the third chapter, we introduce the concepts of signed symmetric autocovariation and generalized auto-association for linear stationary processes. We use these coefficients for identifying the order of a MA stable process. We propose a statistic acting as a partial autocorrelation coefficient. We compare this statistic with quadratic statistics asymptotically invariant based on the ranks and used by Garel and Hallin (1999) for the identification of AR stables. A study of the results is performed using simulations
Michel, Rodriguez Mónica. "Wavelength dependency of phytoplankton photosynthesis : photoregulation and photoacclimation processes in coastal seas." Electronic Thesis or Diss., Université de Lille (2018-2021), 2021. http://www.theses.fr/2021LILUR007.
Phytoplankton photoregulation and photoacclimation are controlled by variations in the light climate (i.e. quantity and quality of light) at different temporal and spatial scales. In coastal and megatidal seas such as the English Channel, the underwater light climate is also affected by the hydrodynamics and river outputs. In one hand, the strong hydrodynamism leads to resuspension processes and to intense vertical mixing, transporting cells through the euphotic layer and beyond, in the disphotic layer. In another hand, large river outputs generate an increase of turbidity with particulate matter and with carbon dissolved organic matter (CDOM). All these processes induce a decrease of light penetration in the water column and a general modification of the light climate. For instance, the CDOM absorbs better blue wavelengths.The wavelength dependent processes of phytoplankton such as photoregulation and photoacclimation have been studied for the first time on natural communities thanks to a new generation of multi-spectral fluorometer called MULTI-COLOR-PAM PAM (Walz). Photosynthesis light curves (P-E) were measured after long dark acclimation at 5 wavelengths, as well as the functional light absorption coefficient of photosystem II (Sigma(II)λ). Furthermore, the development of an original protocol of data analysis including Linear Mixed Effects Models (LME), Principal Triadic Analyses (PTA) and Redundancy Analyses (RDA) have helped the interpretation of this unique dataset and have highlighted the wavelength dependency of photosynthetic processes at different spatial and temporal scales
Rienmueller, Tobias. "Equations intégrales volumiques pour l'acoustique sous marine avec vitesse dépendant de la profondeur." Palaiseau, Ecole polytechnique, 2015. http://www.theses.fr/2015EPXX0052.
Caron, Emmanuel. "Comportement des estimateurs des moindres carrés du modèle linéaire dans un contexte dépendant : Étude asymptotique, implémentation, exemples." Thesis, Ecole centrale de Nantes, 2019. http://www.theses.fr/2019ECDN0036.
In this thesis, we consider the usual linear regression model in the case where the error process is assumed strictly stationary.We use a result from Hannan (1973) who proved a Central Limit Theorem for the usual least squares estimator under general conditions on the design and on the error process. Whatever the design and the error process satisfying Hannan’s conditions, we define an estimator of the asymptotic covariance matrix of the least squares estimator and we prove its consistency under very mild conditions. Then we show how to modify the usual tests on the parameter of the linear model in this dependent context. We propose various methods to estimate the covariance matrix in order to correct the type I error rate of the tests. The R package slm that we have developed contains all of these statistical methods. The procedures are evaluated through different sets of simulations and two particular examples of datasets are studied. Finally, in the last chapter, we propose a non-parametric method by penalization to estimate the regression function in the case where the errors are Gaussian and correlated
Esstafa, Youssef. "Modèles de séries temporelles à mémoire longue avec innovations dépendantes." Thesis, Bourgogne Franche-Comté, 2019. http://www.theses.fr/2019UBFCD021.
We first consider, in this thesis, the problem of statistical analysis of FARIMA (Fractionally AutoRegressive Integrated Moving-Average) models endowed with uncorrelated but non-independent error terms. These models are called weak FARIMA and can be used to fit long-memory processes with general nonlinear dynamics. Relaxing the independence assumption on the noise, which is a standard assumption usually imposed in the literature, allows weak FARIMA models to cover a large class of nonlinear long-memory processes. The weak FARIMA models are dense in the set of purely non-deterministic stationary processes, the class of these models encompasses that of FARIMA processes with an independent and identically distributed noise (iid). We call thereafter strong FARIMA models the models in which the error term is assumed to be an iid innovations.We establish procedures for estimating and validating weak FARIMA models. We show, under weak assumptions on the noise, that the least squares estimator of the parameters of weak FARIMA(p,d,q) models is strongly consistent and asymptotically normal. The asymptotic variance matrix of the least squares estimator of weak FARIMA(p,d,q) models has the "sandwich" form. This matrix can be very different from the asymptotic variance obtained in the strong case (i.e. in the case where the noise is assumed to be iid). We propose, by two different methods, a convergent estimator of this matrix. An alternative method based on a self-normalization approach is also proposed to construct confidence intervals for the parameters of weak FARIMA(p,d,q) models.We then pay particular attention to the problem of validation of weak FARIMA(p,d,q) models. We show that the residual autocorrelations have a normal asymptotic distribution with a covariance matrix different from that one obtained in the strong FARIMA case. This allows us to deduce the exact asymptotic distribution of portmanteau statistics and thus to propose modified versions of portmanteau tests. It is well known that the asymptotic distribution of portmanteau tests is correctly approximated by a chi-squared distribution when the error term is assumed to be iid. In the general case, we show that this asymptotic distribution is a mixture of chi-squared distributions. It can be very different from the usual chi-squared approximation of the strong case. We adopt the same self-normalization approach used for constructing the confidence intervals of weak FARIMA model parameters to test the adequacy of weak FARIMA(p,d,q) models. This method has the advantage of avoiding the problem of estimating the asymptotic variance matrix of the joint vector of the least squares estimator and the empirical autocovariances of the noise.Secondly, we deal in this thesis with the problem of estimating autoregressive models of order 1 endowed with fractional Gaussian noise when the Hurst parameter H is assumed to be known. We study, more precisely, the convergence and the asymptotic normality of the generalized least squares estimator of the autoregressive parameter of these models
Eu, Jean-François d'. "Spectroscopie millimétrique et infrarouge de Si2H2F2, NO et HCN : différenciation des profils Galatry et de Voigt dépendant des vitesses." Lille 1, 2001. https://pepite-depot.univ-lille.fr/RESTREINT/Th_Num/2001/50376-2001-141.pdf.
Nicolas, Virginie. "Interaction du complexe membranaire RH avec le squelette erythrocytaire spectrine-dépendant : caractérisation moléculaire et altération dans des phénotypes variants." Paris 7, 2004. http://www.theses.fr/2004PA077132.
Martin, Pierre-Marie. "Rôle de SCHIP-1 dans l'organisation et la fonction des fibres myélinisées." Paris 6, 2008. http://www.theses.fr/2008PA066479.
Meresse, Cédric. "Contribution à l'analyse de la dynamique quantique dans des systèmes de Hall en présence d'un flux Aharonov-Bohm dépendant du temps." Phd thesis, Université de la Méditerranée - Aix-Marseille II, 2010. http://tel.archives-ouvertes.fr/tel-00541689.
T'Jampens, Stéphane. "Etude de la violation de la symétrie CP dans les canaux charmonium-K*(892) par une analyse angulaire complète dépendante du temps (expérience BABAR)." Phd thesis, Université Paris Sud - Paris XI, 2002. http://tel.archives-ouvertes.fr/tel-00002447.
Baumard, Julie. "Transport and spectral properties of low-dimensional superconductors in the presence of spin-dependent fields." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0357.
The interplay between superconductivity and spin-dependent fields is known to lead to striking phenomena, like critical field enhancement, magnetoelectric effects and the appearance of Yu-Shiba-Rusinov bound states at magnetic impurities. In this thesis, we investigate these effects in low dimensional systems.We first demonstrate that the combination of both spin-orbit and Zeeman fields in superconducting one-dimensional systems leads to the appearance of an inhomogeneous phase at low magnetic field and high critical temperature. We show that the ground state corresponds to a zero-current state where the current stemming from spin-orbit coupling, called anomalous charge current, is exactly compensated by the current coming from the wave-vector of the superconducting order parameter. We also discuss how it is possible to predict the appearance of the anomalous current from symmetry arguments based on the SU(2)-covariant formalism.In a second part, we consider a type-II superconducting thin film in contact with a Néel skyrmion. The skyrmion induces spontaneous currents in the superconducting layer, which under the right condition generate a superconducting vortex in the absence of external magnetic fields. We compute the magnetic field and current distributions in the superconducting layer in the presence of the Néel skyrmion.In the last part of this thesis, we focus on the appearance of Yu-Shiba-Rusinov states in the superconducting crystal beta-Bi2Pd. We propose effective models in order to explain recent experimental results showing a double spatial oscillation of the local density of states at Shiba energy. We demonstrate that the minimal condition to reproduce this double oscillation is the presence of two superconducting channels connected via a hopping term or via a magnetic impurity. These effective models can be easily generalized to describe the spectrum of multiband superconductors with magnetic impurities
Dhifallah, Sandra. "Étude fonctionnelle de mutations des canaux sodiques potentiel-dépendants Nav1.1 et Nav1.2 : corrélation phénotype/génotype et mise en évidence d’un mécanisme spécifique pour les troubles du spectre de l’autisme." Thesis, Université Côte d'Azur, 2020. http://www.theses.fr/2020COAZ6004.
The genes encoding for the voltage-gated sodium channels (Nav) expressed in the central nervous system are the target of numerous mutations leading to various phenotypes. The aim of my work is to understand why mutations in the same gene can lead to distinct pathologies in order to consider the development of new therapeutic approaches. The SCN1A gene encoding for the Nav1.1 channels, mainly expressed in GABAergic interneurons (GABA IN), is the target of mutations responsible for epileptic syndromes and familial hemiplegic migraine (FHM-3), a rare form of migraine with aura. The mutations responsible for epilepsy have been shown to cause a loss of function, which leads to hypoexcitability of GABA IN and subsequently to the network hyperexcitability. At the opposite, the mutations responsible for MHF-3 showed a gain of function and hyperexcitability of GABA IN which can lead to the cortical spreading depression, a pathological mechanism of migarine. In particular, the functional study of the L1649Q mutation showed that the mutation leads to an important decrease of the current density (loss of function). Analysis of the biophysical properties of the mutated channels after partial recovery of the current density showed that the overall effect of the mutation is a gain of function, consistent with an hyperexcitability of GABA IN (Cestele and al. 2013 PNAS). In order to identify if other FHM-3 mutations share the same mechanism (loss / gain of function), the first part of my thesis aimed to characterize a new mutation responsible for MHF-3, L1670W. This mutation leads to a defect in the Nav1.1 channels expression at the membrane but after partial recovery of the current density, the mutation induces a clear gain of function of Nav1.1 channels. These results showed that the L1670W mutation, like the L1649Q mutation, leads to a defect in the Nav1.1 channels expression at the membrane and a gain in function, thus reinforcing the hypothesis that this mechanism could be generalized to other mutations responsible for MHF-3. The SCN2A gene encodes for the α subunit of Nav1.2 channels mainly expressed in excitatory neurons. Mutations in the SCN2A gene are responsible for different pathologies such as benign epilepsies, epileptic encephalopathies and autism spectrum disorder (ASD). To date, the detailed mechanisms responsible for these different pathologies remain unclear. In order to elucidate the genotype/phenotype relationship, we studied the functional effects of 23 SCN2A mutants responsible for these different pathologies. Our results show that all the mutations responsible for ASD induce an important decrease (almost complete) of the current density while for the other pathologies the effects are heterogeneous. In order to reproduce the heterozygous conditions, we studied the co-expression of wild-type (WT) channels with each mutated channel. Our results showed a reduction in the WT channels current density only in the presence of channels carrying mutations responsible for ASD. Consequently, only the mutations responsible for ASD induce a negative dominance on WT channels. To determine whether this negative dominance mechanism is due to the interaction of α subunits described recently (Clatot et al., 2018 Nat Commun), we used different strategies to inhibit this interaction. The results obtained showed that the negative dominance effect of the mutants responsible for ASD is no longer observed when the interaction between the α subunits is inhibited. Therefore, our results allow us to describe for the first time that mutations in Na+ channels responsible for ASD act by a negative dominance mechanism, which is mediated by the interaction between WT and mutated channels
Pujol, Camille. "Le récepteur 5-HT6 et la dynamique de son réceptosome : rôle dans la différenciation neuronale et potentiel thérapeutique pour le traitement des troubles du spectre de l’autisme." Thesis, Montpellier, 2018. http://www.theses.fr/2018MONTT059.
Cognitive symptoms observed in neurodevelopmental pathologies such as schizophrenia or autism spectrum disorders are highly debilitating and poorly controlled by currently available treatments. Accordingly, there is still an urgent need for new therapeutic approaches. It has become clear in the last few years that these cognitive deficits are caused by neurodevelopmental alterations. The 5-HT6 receptor has emerged as one promising targets for the treatment of these deficits in light of its early expression during brain development, its role in key neurodevelopmental processes such as neuronal migration ad neurite growth and the pro-cognitive effects of antagonists in various cognitive tasks in rodents. In order to identify novel molecular substrates of the control of cognition and neural development by 5-HT6 receptors, our team has recently characterized the receptor interactome thanks to complementary proteomic strategies. Further functional studies revealed that the Cdk5 pathway under the control of 5-HT6 receptor plays a crucial role in in the migration and positioning of cortical pyramidal neurons as well as in the initiation of neurite outgrowth. The new protein partners of the receptor identified also include G protein-regulated inducer of neurite outgrowth 1 (GPRIN1), a Cdk5 substrate, known to promote neurite outgrowth. This thesis aims at characterizing the impact of the 5-HT6 receptor/GPRIN1 interaction upon receptor activity and neuronal differentiation in a neuroblastoma cell line (NG108-15 cells) commonly used as a cellular model for studying molecular mechanisms underlying neuronal differentiation. I showed that GPRIN1 interacts with a receptor sequence comprising the 22 N-terminal residues of its C-terminal domain via a mechanism depending on its association with activated Gαs protein and regulated by receptor phosphorylation at Ser350 by Cdk5, thus demonstrating that the receptor recruits either Cdk5 or GPRIN1 in a dynamic manner. I then showed that the physical interaction between GPRIN1 and the 5-HT6 receptor stabilizes an active receptor conformation able to activate Gs and the production of cAMP in an agonist-independent manner and exhibiting a low apparent affinity for inverse agonists. This interaction also promotes neurite extension and branching both in NG108-15 cells and primary cultured neurons originating from different regions of the mouse brain. These effects upon neuronal differentiation are mediated by agonist-independent activation of the Gs/adenylyl cyclase/PKA pathway. Collectively, my results indicate that neuronal differentiation under the control of 5-HT6 receptors requires a complex sequence of signaling mechanisms that depends on the sequential association of the receptor with Cdk5 and GPRIN1: while the 5-HT6/Cdk5 interaction is required for the initiation of neurite growth, neurite extension and branching depends on receptor association with GPRIN1. Finally, I demonstrated that sub-chronic administration to mice depleted of Mu opioid receptor (Oprm1-/- mice, preclinical model of autism spectrum disorders - ASDs -) improves a range of primary symptoms, including alteration of social cognition and stereotypic behaviors, suggesting that 5-HT6 receptor blockade might be a relevant strategy for the treatment of some behavioral symptoms in ASDs. Collectively, this thesis highlights the role of the 5-HT6 receptor interactome and of its dynamics in neuronal differentiation and the establishment of neuronal connectivity and opens new perspectives for the treatment of psychiatric disorders of neuro-developmental origin, such as ASDs
Gravier, Laurent. "Etude magnéto-optique des effets dépendants des spins de porteurs dans des structures de puits quantiques GaAs/GaAlAs en modulation de dopage." Université Joseph Fourier (Grenoble), 1996. http://www.theses.fr/1996GRE10083.
Fahs, Amin. "Modeling of naturel convection in porous media : development of semi-analytical and spectral numerical solutions of heat transfer problem in special domains." Thesis, Strasbourg, 2021. https://publication-theses.unistra.fr/restreint/theses_doctorat/2021/Fahs_Amin_2021_ED269.pdf.
The problem of the porous square cavity is extensively used as a common benchmark case for Natural convection (NC) problem in porous media. It can be used for several numerical, theoretical, and practical purposes. All the existing high accurate solutions are developed under steady-state conditions. However, it is well known that the processes of NC in porous media occurs naturally in a time-dependent procedure, as boundary conditions can be variable in time. Also, the convergence of the steady-state solution is known to be difficult. To overcome this difficulty, the steady-state solution is often simulated as a transient solution that evolves until reaching the steady-state condition. These time-dependent modes are very efficient to detect the effects of the parameter variations on the physical process of NC, especially for the subject of interest in this thesis: the domain inclination level and hot wall temperature variation in time. For this purpose, three goals are identified in this Thesis: 1. Developing a time-dependent solution of natural convection in porous media using the Darcy model in two modes: Transient and unsteady. 2. Investigating the time-dependent behavior of natural convection in porous media having the domain inclination level as a variable parameter in two modes: Transient and unsteady. 3. Developing a time-dependent solution of natural convection in porous media using the Darcy-Lapwood-Brinkman model in two modes: Transient and unsteady. To do so, according to the high accuracy in the simply connected domains, one of the Galerkin spectral weighted residual method is chosen to develop a space-time dependent solution for NC problem in a square porous cavity. Applying the Fourier-Galerkin (FG) procedure, two configurations dealing with transient and unsteady regimes are considered where each solution is derived for a wide range of Rayleigh numbers with other special conditions. This work of thesis is explained in details as five chapters.The NC physical process with the time-dependent variations is described in the transient mode to reach the steady-state solution and for the unsteady mode during a one period using periodic sinusoidal boundary conditions on the cavity hot wall. Finally, the work of this thesis is described in details in five chapters; while the sixth and last chapter is devoted to the summary and conclusion.The results in this thesis work provide a set of high-accurate data that are published in three papers to be used for testing numerical codes of heat transfer in time-dependent configurations
Chibani, Siwar. "TD-DFT simulation of the properties of the excited states." Nantes, 2014. http://archive.bu.univ-nantes.fr/pollux/show.action?id=a06bd22a-c134-4a33-a4b5-8f2bb5dac6b6.
During this thesis, we have defined an efficient protocol to simulate qualitatively and quantitatively the absorption and emission spectra of aza-BODIPY, BODIPY, boranils and dioxaborines dyes. In this protocol, we have used the TD-DFT level to determine the structural parameters and vibrational effects for both ground and excited states, and we have calculated the vertical absorption and emission transition energies at the SOS-CIS(D) level. This "hybride" approach can be used for a large number of compounds in a relatively low computing time to achieve an accuracy of about 0. 1 eV and an impressive consistency with the experimental data (R2 > 0. 95). Specifically, we have shown that the M06-2X exchange-correlation functional is the most efficient to determine the 0-0 energies and the topologies of the bands of these molecules. By studying the atomic basis set effects, we have found that the structures and vibrational signatures can be calculated precisely with a compact atomic basis set, 6-31G(d), while the total energies require the use of a larger atomic basis set, 6-311+G(2d,p). To Take into account the solvent effect, several PCM models (LR, cLR and SS-PCM) have been tested. SS-PCM approach is the most appropriate model for the aza-BODIPY and BODIPY while LR and cLR approaches are more suitable for boranils and dioxaborines. The models used in this thesis have been tested on a large number of compounds to analyze the auxochromic, solvatochromic, acidochromic effects. . . In connection with recent experimental data
Tusche, Marco. "Empirical processes of multiple mixing data." Thesis, Tours, 2013. http://www.theses.fr/2013TOUR4033/document.
The present thesis studies weak convergence of empirical processes of multiple mixing data. It is based on the articles Durieu and Tusche (2012), Dehling, Durieu, and Tusche (2012), and Dehling, Durieu, and Tusche (2013). We follow the approximating class approach introduced by Dehling, Durieu, and Voln (2009)and Dehling and Durieu (2011), who established empirical central limit theorems for dependent R- and R”d-valued random variables, respectively. Extending their technique, we generalize their results to arbitrary state spaces and to empirical processes indexed by classes of functions. Moreover we study sequential empirical processes. Our results apply to B-geometrically ergodic Markov chains, iterative Lipschitz models, dynamical systems with a spectral gap on the Perron—Frobenius operator, and ergodic toms automorphisms. We establish conditions under which the empirical process of such processes converges weakly to a Gaussian process
Timrov, Iurii. "Étude ab initio des plasmons et du couplage électron-phonon dans le bismuth: de la modélisation de l'absorption des porteurs libres à une nouvelle méthode pour le calcul de spectre de perte d'énergie électronique." Phd thesis, Ecole Polytechnique X, 2013. http://pastel.archives-ouvertes.fr/pastel-00823758.
Attafi, Yosra. "Étude des effets des collisions dans les spectres infrarouges de CH₃I, molécule d’intérêt atmosphérique." Electronic Thesis or Diss., Université Paris Cité, 2020. http://www.theses.fr/2020UNIP7086.
The work presented in this manuscript is devoted to the study of the effects of collisions in the infrared spectra of CH₃I, which is an important source of iodine, which is a catalyst for ozone destruction. Good modelling of its absorption spectrum is therefore essential for atmospheric concentration measurements. In international databases, the band ν6 is not mentioned due to the lack of spectroscopic parameters. Being very intense and localized in the atmospheric window of 11 μm, the ν6 band could be used for future IR detection of CH₃I, by instruments probing in the IR, such as the IASI-NG instrument under preparation. But first, it is necessary to provide the spectroscopic parameters of CH₃I, using laboratory spectroscopy. It is in this context that our work has been carried out. The manuscript consists of five parts. The first part concerns the spectroscopic properties of the CH3I molecule. The second part is dedicated to the apparatus, with a description of the Bruker IFS125HR FTIR spectrometer. In the third part, we present the results of the line intensities and self-broadening coefficients that are extracted from the recorded spectra. The fourth part presents the results obtained on N₂, O₂ broadening and shift coefficients. The last part is devoted to the interpretation of the collisional widening measurements, previously obtained using theoretical calculations. The dependence of these parameters on the quantum numbers J and K has been studied
Maaroufi, Nourhene. "Détermination des paramètres spectroscopiques des bandes v1 et v3 de NH3 par spectroscopie infrarouge." Electronic Thesis or Diss., Sorbonne Paris Cité, 2019. http://www.theses.fr/2019USPCC099.
The aim of this work was to determine the parameters of the absorption lines of the ammonia molecule for atmospheric applications. In this regard, we measured, at room temperature, the intensities, the broadening and the shift coefficients of the lines of the bands v1, v3, 2v4, and 4v2 in the spectral region 3050-3600 cm-1 of self-disturbed NH3. These measurements were carried out in a large number of branches of these bands with very high precision using a high resolution Fourier transform infrared spectrometer (0.008 cm-1).These spectroscopic parameters were determined using a multi-pressure fitting technique using two different profiles: a Voigt profile and a Rosenkranz profile.The manuscript consists of five parts. The first part concerns the spectroscopic properties of ammonia. The second part is dedicated to the apparatus, with the description of the Bruker IFS125HR IRTF spectrometer. In the third part, we expose the results of the line intensities and self-broadenings of isolated lines, which are extracted from the recorded spectra, bands v1, v3, 2v4 and 4v2 of NH3. The fourth part presents the results obtained on line shifts and the interference effects between the components of the doublets of the v1 and v3 bands of NH3.To interpret the results of the line width measurements of the self-disturbed NH3 collisional system, we will present in chapter 5 the formalism adopted for the calculation of these widths. A comparison between the calculated and measured widths makes it possible to test the validity of the formalism used
Lambert-Lacroix, Sophie. "Fonction d'autocorrélation partielle des processus à temps discret non stationnaires et applications." Phd thesis, Université Joseph Fourier (Grenoble), 1998. http://tel.archives-ouvertes.fr/tel-00004893.
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