Academic literature on the topic 'Propriétés spatio-Temporelles'
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Dissertations / Theses on the topic "Propriétés spatio-Temporelles":
Olivier, Gérard. "Propriétés spatio-temporelles de l'image mentale visuelle." Nice, 1998. http://www.theses.fr/1998NICE2032.
Campo, David. "Propriétés des spectres primordiaux dans le scénario inflationnaireCorrélations spatio-temporelles et rôle des fréquences trans-planckiennes." Tours, 2004. http://www.theses.fr/2004TOUR4013.
In this thesis I study the primordial metric fluctuations which are predicted in the cosmological scenario known as inflation, and which are at the origin of the large scale structures in the universe. The first part contains an introduction to the Standard Cosmological Model and to the inflationary paradigm. In the second part I present an analysis of the space-time correlations in inflationary spectra in quantum settings. In the next part I reexamine the questions of the decoherence and the entropy of the primordial spectra. The last section of the manuscript is devoted to the role played by very high frequences, the so-called trans-Planckian frequencies, in the properties of the inflationary spectra
Genet, Marie. "Variations spatio-temporelles des propriétés de renforcement racinaire de forêts naturelles et plantées dans le sud ouest de la Chine et leurs impacts sur la stabilité des pentes." Bordeaux 1, 2007. http://www.theses.fr/2007BOR13546.
Vegetation, and particularly trees, can be used in ‘eco-engineering’ techniques to stabilize sloping terrain, thus preventing slope instability and soil erosion. The influence of root reinforcement has traditionally been investigated through mechanical and empirical studies. However, how soil is reinforced on a larger scale and the influence of stand structure and local environment on slope stability is still lacking, largely due to the heterogeneity of parameters and root morphological characteristics. This study examined such spatial and temporal heterogeneity through field studies and incorporated data into models of slope stability; results can be used to establish effective plans for managing natural and plantation forest. Fieldwork was carried out in the regions of Sichuan and Tibet in China, a country where soil conservation is a priority after many years of severe deforestation
Haubert, Jérôme. "Contrôle de concurrence et ordonnancement des transactions dans les SGBD temps réel." Le Havre, 2006. http://www.theses.fr/2006LEHA0005.
Real-time database systems are systems designed to manage applications which deal with large volume of data and which need real-time processing of these data. The concurrent access control on data items by transactions is one of the main problems in DBSs. Indeed, on top of the traditional DBS objectives, the system must maximize the number of transactions which meet their deadline. In distributed context, the problem is more complex, since for the distributed transaction commit process. In this document, we give an overview of the main transaction concurrency control and commit protocols proposed in classical DBSs, and in RTDBSs. Then, we present our contribution in the real-time transaction management. Our work is mainly based on the relaxation of ACID properties. These works enter within the scope of an ACI-JC project (#1055) we have obtained in 2002
Federico, Maxime. "Spatio-temporal description of single photons : from cavity production to local detection." Electronic Thesis or Diss., Bourgogne Franche-Comté, 2024. http://www.theses.fr/2024UBFCK013.
This work provides an analysis of spatio-temporal properties of single-photon states. Starting with a direct quantization in position space representation, we show that two different formulations are equivalent, i.e., they give the same quantum theory. The equivalence is formulated in terms of isomorphisms of their respective Hilbert space of states. We then use this construction in position space to study the propagation of photons in terms of pulses and we show that the dynamics of any state of the quantum electromagnetic field is given by the classical Maxwell equations for the classical pulse onto which the photons are defined. We also construct a model for local detection of photons using the energy density operator. This model allows us to show the nonlocality of all single-photon states using the anti-local property of the frequency operator Ω=c(-Δ)^{1/2}. We then characterize this nonlocal property for a single-photon state spontaneously emitted by a Hydrogen atom and we show a radial decay of its energy density of 1/r^6 in the asymptotic limit of large distances r from the atom. Finally, we consider the production of photons in cavities where we show through topological arguments that in the adiabatic limit, the rotating wave approximation is justified and thus the photons produced with these techniques can be very close to perfect single photons. We also construct as a preliminary result a heuristic model using quasinormal modes to describe the production of photons inside leaky cavities
Ailliot, Pierre. "Modèles autorégressifs à changements de régimes markoviens. Applications aux séries tempo-relles de vent." Phd thesis, Université Rennes 1, 2004. http://tel.archives-ouvertes.fr/tel-00007602.