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Literatura académica sobre el tema "Filtrations dynamiques"
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Artículos de revistas sobre el tema "Filtrations dynamiques"
DUCROCQ, E., S. VANNOYE y F. MAZOUNI. "La recharge artificielle de la nappe pour pérenniser la ressource : retour d’expérience de l’unité de Moulle (Pas-de-Calais)". Techniques Sciences Méthodes 12 (20 de enero de 2023): 43–52. http://dx.doi.org/10.36904/202212043.
Texto completoJuiliard, L. "Scanner dynamique pour l’etude de la perfusion et de la filtration". Journal de Radiologie 88, n.º 10 (octubre de 2007): 1473. http://dx.doi.org/10.1016/s0221-0363(07)81485-5.
Texto completoPoty, V., J. Ferain, A. Vlassenbroeck, L. Defrize y E. Coche. "Apport de la filtration dynamique des images dans le suivi oncologique thoraco-abdominal au scanner". Journal de Radiologie 89, n.º 10 (octubre de 2008): 1493–94. http://dx.doi.org/10.1016/s0221-0363(08)76574-0.
Texto completoGONZÁLEZ VÁZQUEZ, B., J. M. CHOUBERT, J. P. CANLER y E. PAUL. "Prévoir et prévenir la dérive vers le colmatage d’un biofiltre". 3 3 (21 de marzo de 2022): 49–62. http://dx.doi.org/10.36904/tsm/202203049.
Texto completoTesis sobre el tema "Filtrations dynamiques"
Li, Yidan. "Filtrations statiques et dynamiques de différents systèmes argile, électrolytes, polymère". Orléans, 1996. http://www.theses.fr/1996ORLE2014.
Texto completoBenzoni, Séverin. "Classification des filtrations dynamiques et étude des systèmes d'entropie positive". Electronic Thesis or Diss., Normandie, 2024. https://theses.hal.science/tel-04835404.
Texto completoIn this thesis, we explore the possible structures of measure preserving dynamical systems of the form $\bfX :=(X, \A, \mu, T)$ and their factor $\s$-algebras $\B \subset \A$. The first two chapters investigate various ways in which a factor $\s$-algebra $\B$ can sit in a dynamical system $\bfX :=(X, \A, \mu, T)$, i.e. we study some possible structures of the \emph{extension} $\A \arr \B$. In the first chapter, we consider the concepts of \emph{super-innovations} and \emph{standardness} of extensions, which are inspired from the theory of filtrations. An important focus of our work is the introduction of the notion of \emph{confined extensions}, which first interested us because they have no super-innovation. We give several examples and study additional properties of confined extensions, including several lifting results. Then, we show our main result: the existence of non-standard extensions. Finally, this result finds an application to the study of dynamical filtrations, i.e. filtrations of the form $(\F_n)_{n \leq 0}$ such that each $\F_n$ is a factor $\s$-algebra. We show that there exist \emph{non-standard I-cosy dynamical filtrations}.The second chapter furthers the study of confined extensions by finding a new kind of such extensions, in the setup of Poisson suspensions: we take an infinite $\s$-finite measure-preserving dynamical system $(X, \mu, T)$ and a compact extension $(X \times G, \mu \otimes m_G, T_\phi)$, then we consider the corresponding Poisson extension $((X \times G)^*, (\mu \otimes m_G)^*, (T_\phi)_*) \to (X^*, \mu^*, T_*)$. We give conditions under which that extension is confined and build an example which fits those conditions.Lastly, the third chapter focuses on a family of dynamical filtrations: \emph{weak Pinsker filtrations}. The existence of those filtrations on any ergodic system comes from a recent result by Austin \cite{austin}, and they present themselves as a potential tool to describe positive entropy systems. We explore the links between the asymptotic structure of weak Pinsker filtrations and the properties of the underlying dynamical system. Naturally, we also ask whether, on a given system, the structure of weak Pinsker filtrations is unique up to isomorphism. We give a partial answer, in the case where the underlying system is Bernoulli. We conclude our work by giving two explicit examples of weak Pinsker filtrations
Lanthier, Paul. "Aspects ergodiques et algébriques des automates cellulaires". Thesis, Normandie, 2020. http://www.theses.fr/2020NORMR034.
Texto completoThe first part of this manuscript falls within the framework of probability theory, and is devoted to the study of filtrations generated by some cellular automata. We study two versions of an algebraic automaton acting on configurations whose states take values in a finite Abelian group: one is deterministic, and consists in adding the states of two consecutive cells, and the second is a random perturbation of the first one. From these automata, random Markovian processes are constructed and the filtrations generated by these processes are studied. Using the I-cosiness criterion, we show that the two filtrations are standard in the sense developed by Vershik. However, cellular automata have the particularity of commuting with the coordinate shift operator. In this thesis, we introduce a new classification of the filtrations called "dynamic" which takes into account the action of this transformation. Filtrations are no longer defined on probability spaces but on dynamical systems, and are in this case "factor" filtrations: each sigma-algebra is invariant by the dynamics of the system. The counterpart of standardity from the dynamic point of view is studied. This creates a necessary criterion for dynamic standardity called "dynamic I-cosiness". The question of whether the dynamic I-cosiness is sufficient remains open, but a first result in this direction is given, showing that a strengthened version of the dynamic I-cosiness leads to dynamic standardity. By establishing that it does not satisfy the criterion of dynamic I-cosiness, it is proved that the factor filtration generated by the deterministic automaton is not dynamically standard, and therefore that the dynamic classification of the filtrations differs from the classification developed by Vershik. The probabilistic automaton depends on an error parameter, and it is shown by a percolation argument that the factor filtration generated by this automaton is dynamically standard for large enough values of this parameter. It is conjectured that it will not be dynamically standard for very small values of this parameter. The second part of this manuscript, more algebraic, has its origin in a musical problem, linked to the calculation of intervals in a periodic melodic line. The work presented here continues the research of the Romanian composer Anatol Vieru and of Moreno Andreatta and Dan Vuza, but in an original way from the point of view of cellular automata. We study the action on periodic sequences of two algebraic cellular automata, one of which is identical to that of the first part. The questions on the characterization of reducible and reproducible sequences as well as the associated times have been deepened and improved for these two automata. The calculation of preimages and images via the two automata was explained. The question of the evolution of the periods was treated with the creation of a tool called "characteristic" which allows to describe and control the evolution of the period in negative times. Simulations show that the evolution of the periods when the preimages are drawn at random follows an almost regular pattern, and the explanation of this phenomenon remains an open question. The mathematical results of this second part have been used in the "Automaton" module of a free composing software called "UPISketch ». This module allows a composer to create melodic lines by iterating images or taking successive preimages of a starting melodic line
Espina, V. "Fractionnement de protéines du lait par filtration dynamique". Phd thesis, Université de Technologie de Compiègne, 2009. http://tel.archives-ouvertes.fr/tel-00433359.
Texto completoPayet, Sophie. "Filtration stationnaire et dynamique des aérosols liquides submicroniques". Paris 12, 1991. http://www.theses.fr/1991PA120047.
Texto completoEspina, Perez Valentina Soledad. "Fractionnement de protéines du lait par filtration dynamique". Compiègne, 2009. http://www.theses.fr/2009COMP1820.
Texto completoThis thesis focuses on milk proteins fractionation by dynamic filtration. A two-stage process has been proposed in order to separate milk proteins into three main fractions: casein micelles, A-Lactalbumin and A-Lactoglobulin. The first stage of the process consists in microfiltration of skim milk for separating casein micelles from whey proteins. The performances of two dynamic filtration modules: the Multi Shaft Disk (MSD) module and the rotating disk module have been compared. The results have shown that the MSD module presents high permeate flux, good whey proteins transmission and high casein micelles rejection. The second stage of the process is the separation of A-Lactalbumin from B-Lactoglobulin by ultrafiltration. The rotating disk module equipped with a disk with vanes and rotating at 2000 rpm, was used. The protein transmission and selectivity were constant during whey concentration. This is an advantage of dynamic filtration because in crossflow filtration protein transmission and selectivity decreased during whey concentration. The selectivities obtained with dynamic filtration, without changes in pH and ionic strength of the solution, were in the same range as those obtained with crossflow filtration after pH and ionic strength optimization
Payet, Sophie. "Filtration stationnaire et dynamique des aérosols liquides submicroniques /". Saclay : Commissariat à l'énergie atomique, 1992. http://catalogue.bnf.fr/ark:/12148/cb35520293q.
Texto completoFrappart, Matthieu. "Traitement d'effluents modèles de l'industrie laitière par filtration dynamique". Compiègne, 2006. http://www.theses.fr/2006COMP1651.
Texto completoLn an environmental context, the dairy industry must find new solutions to treat this process waters which, although not toxic, have a strong polluting capacity because of the raw material losses (lactose, milk proteins). The membrane processes are weIl adapted to this type of application. Studies were carried out in nanofiltration and reverse osmosis in order to produce a reusable water or water which can be rejected into the natural environment according to rejection standards. These studies, carried out on vibrating and rotating systems avoiding the fouling of membranes and thus maintaining their performances in terms of fluxes and retentions, have permitted, in nanofiltration, to obtain a rejectable water, whereas the classical crossflow systems do not allow it, and to reach, in reverse osmosis, specific characteristics of reuse (boiler feed water for example)
Luo, Jianquan. "Traitement d'effluents industriels par filtration membranaire dynamique à fort cisaillement". Compiègne, 2012. http://www.theses.fr/2012COMP2026.
Texto completoMembrane filtration is easy to combine with other technologies to treat industrial wastewater, for the production of reusable water and the reutilization of organic/inorganic components. But flux decline due to concentration polarization and membrane fouling is an important limitation in applying membrane technologies to recycle wastewater. In order to reduce flux decline, shear-enhanced membrane filtration was used to treat detergent and dairy wastewaters in this work. Flux behaviors, fouling mechanisms, foulant roles and control strategies in recycling wastewater by shear-enhanced membrane filtration were investigated to provide useful information for industrial applications. The flux decline in the treatment of detergent wastewater by nanofiltration (NF) could be controlled as the surfactant concentration polarization layer was reduced by high shear rate on the membrane. Increasing feed pH had a positive effect by enhancing electrostatic repulsion between surfactant molecules and membrane. The membrane fouling layer could be broken up by water rinse, and thus membrane permeability could be fully recovered without any chemical cleaning. Membrane fouling in the treatment of dairy wastewater was more complicated. When operating at high shear rate and pressure, after a stable flux period, a slow flux decline caused by surface adsorption of foulants (lactose, multivalent salt ions and their aggregates) occurred. In this adsorption fouling stage, pore narrowing and blocking governed by foulant–membrane interaction were the main fouling mechanisms. In absence of chemical cleaning, this adsorption fouling could induce cake fouling formation by proteins-calcium aggregates, resulting in severe flux decline. Ultrafiltration (UF) pretreatment could reduce NF membrane fouling at low shear rate due to the elimination of caseins and whey proteins, while it had a negative effect on NF of UF permeate at high shear rates. Two new membrane operations, i. E. At extreme hydrodynamic conditions and threshold flux conditions, were proposed. Extreme hydrodynamic conditions consists in high shear rate and high applied pressure (up to 40 bar), while threshold flux operation implies limiting the flux to reduce fouling (the point above which flux ceases to increase linearly with transmembrane pressure). The former had high process efficiency and good permeate quality, but the latter is advantageous in long-term runs due to low flux decline. It can be concluded that, using shear-enhanced membrane filtration, flux decline can be well controlled by its high shear rate on the membrane. Extreme hydrodynamic operation with suitable chemical cleaning and threshold flux operation with low fouling rate, are two possible choices for dynamic shear-enhanced membrane process. The comparison and applicability of these two operations need to be further studied
Tu, Z. "Filtration dynamique de suspensions de CaCO3 et de solutions de surfactants". Phd thesis, Université de Technologie de Compiègne, 2009. http://tel.archives-ouvertes.fr/tel-00413890.
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