Academic literature on the topic 'Modélisation de disponibilité'
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Journal articles on the topic "Modélisation de disponibilité":
Barthélémy, Marc. "La croissance des villes vue par la physique statistique." Reflets de la physique, no. 67 (November 2020): 16–20. http://dx.doi.org/10.1051/refdp/202067016.
Savary, S., J. P. Fortin, M. Bernier, and E. Martin. "Modélisation de l'évolution du couvert nival, sur le sous-bassin LG4 de la rivière La Grande dans le nord du Québec, à l'aide du modèle français CROCUS." Revue des sciences de l'eau 17, no. 3 (April 12, 2005): 395–417. http://dx.doi.org/10.7202/705540ar.
Sadoulet, Élisabeth. "Conférence François-Albert Angers (2000). Marchés imparfaits et modélisation des comportements des ménages paysans : où en sommes-nous?" Articles 76, no. 4 (February 5, 2009): 459–89. http://dx.doi.org/10.7202/602332ar.
Ambroise, B. "Génèse des débits dans les petits bassins versants ruraux en milieu tempéré : 2 - Modélisation systémique et dynamique." Revue des sciences de l'eau 12, no. 1 (April 12, 2005): 125–53. http://dx.doi.org/10.7202/705346ar.
Nyckees, Vincent. "Comprendre l’autre comme soi-même ? Pour un modèle médiationniste de l’intercompréhension linguistique." Signifiances (Signifying) 5, no. 1 (June 9, 2022): 84–108. http://dx.doi.org/10.52497/signifiances.v5i1.312.
Mougin, Bruno, Jérôme Nicolas, Yannick Vigier, Hélène Bessière, and Stéphane Loigerot. "« MétéEAU Nappes » : un site Internet contenant des services utiles à la gestion des étiages." La Houille Blanche, no. 5 (October 2020): 28–36. http://dx.doi.org/10.1051/lhb/2020045.
Beven, K., A. Musy, and C. Higy. "Tribune Libre : L'unicité de lieu, d'action et de temps." Revue des sciences de l'eau 14, no. 4 (April 12, 2005): 525–33. http://dx.doi.org/10.7202/705431ar.
Koné, Moussa, Fadaba Danioko, Mamadou Dansoko, Sid-Ali Addouche, David Tchoffa, and Abderrhaman El-Mhamedi. "Evaluation du potentiel de production du biogaz emanant des dechets organiques : cas de Bamako." Journal de Physique de la SOAPHYS 2, no. 2 (May 12, 2021): C20A24–1—C20A24–6. http://dx.doi.org/10.46411/jpsoaphys.2020.02.24.
Zerguini, Seghir, and Nathalie Gaussier. "MUST-B : un modèle LUTI multidisciplinaire au service de la complexité du phénomène urbain." Canadian Journal of Regional Science 43, no. 2 (October 28, 2021): 50–59. http://dx.doi.org/10.7202/1083293ar.
Sauvant, D., J. Van Milgen, and P. Lescoat. "Modélisation de la régulation de la stoechiométrie des fermentations ruminales par la disponibilité en ATP et en NADH2." CrossRef Listing Of Deleted DOIs 44, Suppl. 1 (1995): 167. http://dx.doi.org/10.1051/rnd:199505art0135.
Dissertations / Theses on the topic "Modélisation de disponibilité":
Kanoun, Karama. "Croissance de la sûreté de fonctionnement des logiciels : caractérisation, modélisation, évaluation." Toulouse, INPT, 1989. http://www.theses.fr/1989INPT091H.
Arnaud, Jean. "Performance, disponibilité et coût de services Internet adaptatifs." Phd thesis, Grenoble, 2010. http://tel.archives-ouvertes.fr/tel-00529936.
Devau, Nicolas. "Processus rhizosphériques déterminant la disponibilité en phosphore : apport de la modélisation mécaniste géochimique." Thesis, Montpellier, SupAgro, 2010. http://www.theses.fr/2010NSAM0019.
Root-induced chemical processes are recognized as a major strategy developed by plants to enhance phosphorus (P) availability and thus to promote P acquisition. However, the exact influence of these root-induced chemical processes is still poorly understood and quantified. The present study aimed at investigating the influence of root-induced chemical processes, especially root-induced pH changes, on P availability in the rhizosphere. In this work, we used a set of mechanistic adsorption models (« 1-pK triple plane », ion-exchange and Nica-Donnan) within the framework of the component additive approach in order to simulate the effects of root activity on P availability. First, we described the effects of pH on P availability in several soils unaffected by roots, a Chromic Cambisol and a Luvisol. The Luvisol showed different concentrations in inorganic P because of a long-term fertilisation trial. In the rhizosphere of durum wheat (Triticum tu rgidum durum L.) grown on these two soils, we found that calcium (Ca) uptake, in addition to P uptake and root-induced alkalisation, controlled to various extents the changes of soil P availability. Calcium uptake markedly increased P availability by decreasing the promoting effect of Ca adsorption on P adsorption. The relative influence of these three root processes depended on the solution composition (especially concentration of Ca and pH). Our simulations showed the relationship between changes in P availability and the speciation of adsorbed P onto the different soil minerals. Soil mineralogy, especially the relative abundance of illite vs. Fe oxides, controlled the influence of root processes by regulating the contribution of soil minerals to P adsorption. By identifying a novel root-induced processes, namely the Ca uptake, and describing its influence on P availability, our results demonstrate the ability of surface complexation models to predict the effects of root-i nduced processes on P availability in soils
Saintis, Laurent. "Modélisation et évaluation des performances de disponibilité d'un avion dans un contexte opérationnel lors des phases de conception." Toulouse 3, 2008. http://thesesups.ups-tlse.fr/4300/.
This thesis deals with the modelling and computation of in-service aircraft availability at the preliminary design stage. This problem is crucial for designers because it enables them to evaluate availability indicators in order to improve systems under design and to optimize aircraft support. We formalize the dynamic process of technical incidents and their effects on corrective maintenance in airline's aircraft operations. In the context of a mission defined by a sequence of flight cycles, standard reliability methods are not computationally conceivable with respect to industrial timing constraints. Based on analytic developments, we introduce a methodology that provides an efficient algorithm for computing bounds for availability indicators. Finally, we show the usefulness of our approach on use-cases inspired by real-world aircraft systems
Martinello, Magnos. "Modélisation et évaluation de la disponibilité de services mis en oeuvre sur le web : une approche pragmatique." Toulouse, INPT, 2005. https://hal.science/tel-04595476.
This thesis presents a pragmatic modeling approach allowing designers of web-based applications and systems to evaluate the service availability provided to the users. Multiple sources of service unavailability are taken into account, in particular i) hardware and software failures affecting the servers, and ii) performance degradation (overload of servers, very long response time, etc. ). An hierarchical multi-level approach is proposed based on performability modeling, combining Markov chains and queueing models. The main concepts and the feasibility of this approach are illustrated using a web-based travel agency. Various analytical models and sensitivity studies are presented considering different assumptions with respect to the architectures, recovery strategies, faults, users profile and traffic characteristics
Zequeira, Alfonso Romulo Isbel. "Modélisation stochastique pour l'évalusation de politiques d'inspection et de maintenance des systèmes de sécurité." Troyes, 2005. http://www.theses.fr/2005TROY0008.
High safety systems availability is important to keep industrial risks at low levels. Usually the failures of those systems can be detected only by periodic inspections. Besides, they deteriorate in time. Hence to replace them periodically may decrease total cost. We consider the determination of inspection and maintenance policies of safety systems. Important practical aspects considered in this thesis are the quality of inspections, the quality of maintenance actions and the use of predictive maintenance. We study how to include in the models the opportunities for inspecting and replacing the system. Further, we examine the inspection and maintenance policy for two-components parallel systems with dependent component lifetimes, for two criteria: the cost rate and a reliability constraint
EREAU, Jean François. "Réseaux de Petri pour l'étude de la disponibilité opérationnelle des systèmes spatiaux en phases d'avant-projet." Phd thesis, Université Paul Sabatier - Toulouse III, 1997. http://tel.archives-ouvertes.fr/tel-00010089.
Savard, Christophe. "Amélioration de la disponibilité opérationnelle des systèmes de stockage de l'énergie électrique multicellulaires." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEI111/document.
High-capacity electrical energy storage system (EESS) are often matrix-organized system with a large number of elementary storage cells. Due to manufactoring tolerances and their individual use, the electrical characteristics of these cells do not evolve in the same way. These imbalances reduce operative dependability, in the short term by contributing to a decrease of the charge-discharge capacity, in the long-term by shortening lifetime. To improve storage performance, redundant cells can be added. It is also possible, in order to increase efficiency of stored energy restitution, to balance electrical characteristics by using energy exchange forced by an adequate configuration. It should therefore be possible to increase long-term operative dependability by reconfiguring internal connections in dynamic mode. Parallel-series (PS) architecture EESS consists of the series association of blocks, made up of several cells connected in parallel. Series-Parallel dual solution (SP) associates strings of cells in parallel. If other architectures are being studied, often requiring several switches per cell to reconfigure the matrix, we propose in this thesis a new architecture, called C3C, satisfying an acceptable level of reliability and distributing current flows. We then compare the classic solutions and the C3C in terms of reliability and the long-term operative dependability and propose a reflection on the possibilities to discrete control aspects to pilot architecture with a suitable control algorithm. The reliability of any structure can be improved by redundancy, with additional cells that will be used either to replace failing cells or temporarily supplemeting the weak ones. The system may also be designed to tolerate the defect of a portion of the cells. We demonstrate by modeling reliability diagrams and Markov chains that the C3C and PS architectures have a much eigher level of reliability than a SP architecture. The sustainability of these structures can also be improved by piloting activating and rest of the available resources according to different strategies in a choice algorithm based on SoC (State of Charge) or SoH (State of Health) of each cell. To do this, we model a cell on Matlab, precisely simulating the aging parameters and their dynamic evolution. It emerges that, whatever the architecture, if it includes a minimal share of redundant cells, an adequate differentiated management of the cells allows an improvement of the long-term operative dependability of nearly 40% on average. In order to study the reconfigurability control of architectures, we propose a model based on Discrete Event Systems through a colored Petri net. Simulation of this model has reinforced the behaviors already identified
Djeridi, Radhouane. "Contribution à la maîtrise de la disponibilité de systèmes complexes : proposition d'une méthode de réordonnancement proactif de la maintenance." Phd thesis, Paris, ENSAM, 2010. http://pastel.archives-ouvertes.fr/pastel-00592437.
Dhouib, Karem. "Modélisation, analyse et amélioration de la disponibilité des systèmes de production cellulaires dont les machines sont sujettes à des défaillances aléatoires." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0001/NQ43059.pdf.