Academic literature on the topic 'Propriétés à température finie'
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Journal articles on the topic "Propriétés à température finie"
Dormieux, Luc, and Samir Maghous. "Évolution des propriétés élastiques en poroplasticité finie." Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics 328, no. 8 (August 2000): 593–600. http://dx.doi.org/10.1016/s1620-7742(00)00014-3.
Full textRoustila, Atika, and Jacques Chêne. "Etude par Spectroscopie XPS du Rôle de l’Hydrogène et de la Température sur la Ségrégation du Cérium dans le Composé Intermétallique CeNi2." Journal of Renewable Energies 7, no. 1 (June 30, 2004): 23–30. http://dx.doi.org/10.54966/jreen.v7i1.862.
Full textGraton, Guillaume, F. Kratz, and Jacques Fantini. "Observateurs à mémoire finie. Propriétés et application au diagnostic." Journal Européen des Systèmes Automatisés 41, no. 3-4 (June 10, 2007): 471–503. http://dx.doi.org/10.3166/jesa.41.471-503.
Full textSchapira, Barbara. "Propriétés ergodiques du flot horocyclique d'une surface hyperbolique géométriquement finie." Séminaire de théorie spectrale et géométrie 21 (2003): 147–63. http://dx.doi.org/10.5802/tsg.339.
Full textFares, Hanaa, Albert Noumowe, Sébastien Remond, and Richard Cabrillac. "Bétons autoplaçants à haute température Propriétés mécaniques et physico-chimiques." European Journal of Environmental and Civil engineering 14, no. 1 (January 15, 2010): 29–54. http://dx.doi.org/10.3166/ejece.14.29-54.
Full textCazarre, A., R. Vehil, G. Bonnet, F. Morancho, and P. Austin. "Dépendance en température des propriétés de conduction du silicium massif." J3eA 4 (2005): 002. http://dx.doi.org/10.1051/j3ea:200514.
Full textSchaul, Raphaèle C., Joëlle Duplay, and Yves Tardy. "Propriétés thermodynamiques, température et solubilité de composés organiques du sol." Comptes Rendus de l'Académie des Sciences - Series IIA - Earth and Planetary Science 325, no. 1 (July 1997): 27–33. http://dx.doi.org/10.1016/s1251-8050(97)83269-7.
Full textNguyen Ba Vy, Vy, Didier Richard, and J. P. Gillet. "Propriétés d’une souche d’orthopoxvirus isolée des dromadaires du Niger." Revue d’élevage et de médecine vétérinaire des pays tropicaux 42, no. 1 (January 1, 1989): 19–25. http://dx.doi.org/10.19182/remvt.8872.
Full textRatier, B., A. Moliton, B. Guille, and G. Froyer. "Effet de la température d’implantation sur les propriétés électriques du PPP." Journal de Chimie Physique 89 (1992): 1313–18. http://dx.doi.org/10.1051/jcp/1992891313.
Full textCohen, A., G. Di Bernardo, and D. Decroocq. "Etude des propriétés rhéologiques des coupes lourdes à haute température et pression." Revue de l'Institut Français du Pétrole 43, no. 2 (March 1988): 281–92. http://dx.doi.org/10.2516/ogst:1988017.
Full textDissertations / Theses on the topic "Propriétés à température finie"
Sinito, Chiara. "Propriétés magnéto-optiques de nanocristaux de CdSe individuels à basse température." Thesis, Bordeaux, 2014. http://www.theses.fr/2014BORD0282/document.
Full textThe development of emerging applications of CdSe nanocrystals requires a detailed understanding of the band-edge exciton fine structure and relaxation pathways. This thesis is focused on cryogenic spectroscopy of single nanocrystal with a remarkable photostability. Photoluminescence spectra as a function of temperature and under external magnetic fields provide a spectral fingerprint of the low energy sub-levels, revealing the morphology and the crystal structure of individual nanocrystals. In order to probe the entire band-edge exciton fine structure, a high resolution luminescence excitation technique has been developed. Zeeman and anisotropy-induced splittings are used to reveal the entire 8-state band-edge fine structure, enabling complete comparison with band-edge exciton models. State selective excitation allows the preparation of single quantum states. It is also used to map the hole spin relaxation pathways between the fine structure sub-levels.Charged quantum dots provide an important platform for a range of emerging quantum technologies. Double shell CdSe nanocrystals are engineered to efficiently ionize at cryogenic temperatures, resulting in trion emission with a single sharp zero-phonon line and a near-unity quantum yield. Zeeman splitting of this line enables direct determination of electron and hole g-factors. Spin relaxation is observed in high fields, enabling identification of the trion charge. Importantly, we show that spin flips are completely inhibited for Zeeman splittings below the low-energy bound for confined acoustic phonons. This charac- teristic unique to colloidal quantum dots has potential applications in single spin coherent manipulation
Stern, Anthony. "Comportements métallurgique et mécanique des matériaux de gainage du combustible REP oxydes à haute température." Paris, ENMP, 2007. http://www.theses.fr/2007ENMP1506.
Full textZirconium alloys are used as cladding materials in PWR. As they are submitted to very extreme conditions, it is necessary to check their behaviour and especially to make sure they meet the safety criteria. They are therefore studied under typical in service-loadings but also under accidental loadings. In one of these accidental scenarios, the cladding temperature may increase above 800°C, in a steam environment, and decrease before a final quench of the cladding. During this temperature transient, the cladding is heavily oxidised, and the metallurgical changes leads to a decrease of the post quench mechanical properties. It is then necessary to correlate this drop in residual ductility to the metallurgical evolutions. This is the problem we want to address in this study. As oxygen goes massively into the metallic part - a zirconia layer grows at the same time – during the high temperature oxidation, the claddings tubes microstructure shows three different phases with various mechanical properties. In order to reproduce the behaviour of this multi-layered material, the first part of this study consisted in creating samples with different oxygen contents, similar to those observed in the different phases of the real cladding. The study was especially focused on the phase transformation upon cooling. A mechanism was proposed to describe this phase transformation. Then, these materials were mechanically tested at various temperatures and for various mean oxygen contents. It was thus possible to start some preliminary finite element calculations to describe the cladding behaviour under the standard technological ring compression test
Korchagina, Kseniia. "Etude par dynamique moléculaire des propriétés structurales, dynamiques et thermodynamiques d'agrégats moléculaires." Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30227/document.
Full textWater clusters constitute an important class of chemical species due to their central role in many physico-chemical and biological processes, in particular, atmospheric processes. Their physical and chemical properties are particularly sensitive to size and finite-temperature effects, which makes them particularly difficult to characterize experimentally. This thesis focused on the theoretical investigation of the structural, dynamical and thermodynamical properties as well as on the reactivity of various water clusters with the aim to implement appropriate modeling tools to enable a more detailed description of these systems. To do so, we used the paralleltempering molecular dynamics approach that was coupled with calculations of energies and gradients carried out by the Self-Consistent-Charge Density-Functional based Tight-Binding (SCC-DFTB) method.Three main areas were addressed during the work. In the first part, a detailed analysis of the structure of water clusters (H2O)nSO24- and (H2O)nH2SO4 with n=1-20 is performed. This study highlights the influence of the nature of the sulfur impurity on the hydrogen bond network of these species.The second part of this thesis focuses on the study of the "solid-liquid" phase transition in various water clusters. In addition to the sulfur-containing water clusters mentioned above, we also investigated protonated water clusters containing from 19 to 23 water molecules. To better understand the phase transition mechanism, we considered various structural changes associated with the transition, such as the evolution of the distributions of intermolecular angles and the evolution of the number of molecular rings in the cluster. We also characterized the phase transition through dynamical indicators such as the crossover frequency of the excess proton. The last part of this thesis is devoted to the study of the influence of small water clusters (from 1 to 10 water molecules) on the recombination reaction between the H atom and the CO molecule. This reaction is the first step in the formation of simple oxygenated organic molecules in the interstellar medium. It is therefore of particular interest. Due to the analysis of collisional dynamics between H and CO and the calculation of effective reaction cross sections we showed that the presence of water molecules plays an important role in the HCO radical formation
Debord, Régis. "Développement d'une cellule haute pression haute température dans la presse Paris-Edimbourg pour la mesure de propriétés élastiques et de densité : application sur les oxydes de fer." Paris 6, 2004. http://www.theses.fr/2004PA066448.
Full textDebord, Régis. "Développement d'une cellule haute pression haute température dans la presse Paris-Edimbourg pour la mesure de propriétés élastiques et de densité : Application sur les oxydes de fer." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2001. http://tel.archives-ouvertes.fr/tel-00189118.
Full textMassaoudi, Mohammed. "Contribution à la modélisation du comportement mécanique des matériaux biphasés γ/γ'." Toulouse 3, 2002. http://www.theses.fr/2002TOU30205.
Full textLiu, Xiongjie. "Développement de la caractérisation du comportement local à haute température des alliages métalliques par micro indentation." Thesis, Compiègne, 2017. http://www.theses.fr/2017COMP2326/document.
Full textOver the past two decades, the high-temperature indentation experiment has been developed gradually to meet increasingly high industrial demand. ln order to guarantee a good level of accuracy of the measurements, it is necessary to solve the problems associated with high temperature, such as the choice of the indenter material, the thermal stability of the system, heating design, etc. This thesis aims to develop the methodology of the high-temperature indentation experiment to characterize metallic materials. Particular attention has been given to the search for candidate materials for the tip and to the determination of the force and penetration ranges used for the correct operation of an indenter. The finite element analysis helps us to study the influence of defects such as the presence of a thin film and that of a misalignment between the indentation axis and the sample surface. To find a better indenter material, it is necessary to test the geometric and chemical stability of different candidate materials that can replace the diamond at elevated temperature. The collaboration with the Swiss company Anton Paar, which specializes in the manufacture of measuring machines for the mechanical characterization of a wide variety of materials, enables the development of new high-temperature micro- and nano-indentation equipment. By using the new device, we were able to carry out the indentation tests to characterize the mechanical properties of different materials and to check the thermal stability of this new instrument
Paulin, Sébastien. "Approximations simples d'intégrales de chemins à température finie." Lyon, École normale supérieure (sciences), 2007. http://www.theses.fr/2007ENSL0445.
Full textLiu, Lihui. "Cosmologie quantique à température finie en théorie des supercordes." Phd thesis, Ecole Polytechnique X, 2012. http://pastel.archives-ouvertes.fr/pastel-00733052.
Full textZhong, Anruo. "Machine learning and adaptive sampling to predict finite-temperature properties in metallic materials at the atomic scale." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASP107.
Full textThe properties and behaviors of materials under extreme conditions are essential for energy systems such as fission and fusion reactors. However, accurately predicting the properties of materials at high temperatures remains challenging. Direct measurements of these properties are constrained by experimental instrument limitations, and atomic-scale simulations based on empirical force fields are often unreliable due to a lack of accuracy. This problem can be addressed using machine learning techniques, which have recently become widely used in materials research. Machine learning force fields achieve the accuracy of ab initio calculations; however, their implementation in sampling methods is limited by high computational costs, typically several orders of magnitude greater than those of traditional force fields. To overcome this limitation, this thesis has two objectives: (i) developing machine learning force fields with a better accuracy-efficiency trade-off, and (ii) creating accelerated sampling methods to facilitate the use of computationally expensive machine learning force fields and accurately estimate free energy. For the first objective, we enhance the construction of machine learning force fields by focusing on three key factors: the database, the descriptor of local atomic environments, and the regression model. Within the framework of Gaussian process regression, we propose and optimize descriptors based on Fourier-sampled kernels and novel sparse points selection methods for kernel regression. For the second objective, we develop a fast and robust Bayesian sampling scheme for estimating the fully anharmonic free energy, which is crucial for understanding temperature effects in crystalline solids, utilizing an improved adaptive biasing force method. This method performs a thermodynamic integration from a harmonic reference system, where numerical instabilities associated with zero frequencies are screened off. The proposed sampling method significantly improves convergence speed and overall accuracy. We demonstrate the efficiency of the improved method by calculating the second-order derivatives of the free energy, such as the elastic constants, which are computed several hundred times faster than with standard methods. This approach enables the prediction of the thermodynamic properties of tungsten and Ta-Ti-V-W high-entropy alloys at temperatures that cannot be investigated experimentally, up to their melting point, with ab initio accuracy by employing accurate machine learning force fields. An extension of this method allows for the sampling of a specified metastable state without transitions between different energy basins, thereby providing the formation and binding free energies of defective configurations. This development helps to explain the mechanism behind the observation of voids in tungsten, which cannot be explained by existing ab initio calculations. The free energy profile of vacancies in the Ta-Ti-V-W system is also computed for the first time. Finally, we validate the application of this free energy sampling method to liquids. The accuracy and numerical efficiency of the proposed computational framework, which combines machine learning force fields and enhanced sampling methods, opens up numerous possibilities for the reliable prediction of finite-temperature material properties
Books on the topic "Propriétés à température finie"
Chater, Rabah. Etude des antimonites MeSb₂O₄ à basse température: Évolution structurale, thermodynamique, propriétés élastiques et magnétiques anisotropes. Modélisation. 1986.
Find full textRoth, Connie B. Polymer Glasses. Taylor & Francis Group, 2016.
Find full textRoth, Connie B. Polymer Glasses. Taylor & Francis Group, 2021.
Find full textRoth, Connie B. Polymer Glasses. Taylor & Francis Group, 2016.
Find full textRoth, Connie B. Polymer Glasses. Taylor & Francis Group, 2016.
Find full textPolymer Glasses. Taylor & Francis Group, 2016.
Find full textThermophysical Properties of Metallic Liquids Vol. 2: Predictive Models. Oxford University Press, 2015.
Find full textBook chapters on the topic "Propriétés à température finie"
FLAMANT, Gilles. "Fluides caloporteurs pour centrales solaires." In Le solaire à concentration, 167–84. ISTE Group, 2023. http://dx.doi.org/10.51926/iste.9079.ch5.
Full textCOLAS, Maggy, Patrick SIMON, Michel MERMOUX, and Ganesh D. SOCKALINGUM. "Infrarouge et Raman : de la spectroscopie à l’imagerie." In Spectroscopies vibrationnelles, 197–220. Editions des archives contemporaines, 2020. http://dx.doi.org/10.17184/eac.4201.
Full textDELAFOY, Christine, Frederico GARRIDO, and Yves PIPON. "Les céramiques au coeur des REP." In Les matériaux du nucléaire sous irradiation, 91–127. ISTE Group, 2024. http://dx.doi.org/10.51926/iste.9148.ch3.
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