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Artykuły w czasopismach na temat "Quantification des fuites"
Rondeau, Anthony, Augustin Pouye i Eric Lafargue. "Etude expérimentale sur les émissions acoustiques générées par un écoulement de jet — application à la quantification des fuites dans des organes de robinetterie industrielle". e-journal of nondestructive testing 28, nr 9 (wrzesień 2023). http://dx.doi.org/10.58286/28521.
Pełny tekst źródłaRozprawy doktorskie na temat "Quantification des fuites"
Cunat, Pierre. "Détection et évaluation des fuites à travers les ouvrages hydrauliques en remblai, par analyse des températures réparties, mesurées par fibre optique". Phd thesis, Université de Grenoble, 2012. http://tel.archives-ouvertes.fr/tel-00721827.
Pełny tekst źródłaBoleve, Alexandre. "Localisation et quantification des zones de fuites dans les digues et les barrages par la méthode du potentiel spontané". Phd thesis, Chambéry, 2009. http://tel.archives-ouvertes.fr/tel-00381930.
Pełny tekst źródłaMarsac, Perrine. "Analyse automatisée d’images IRM ciné et flux 4D (3D+t) pour une meilleure quantification des fuites des valves cardiaques chez l’Humain". Electronic Thesis or Diss., Sorbonne université, 2024. http://www.theses.fr/2024SORUS031.
Pełny tekst źródłaThe heart valves, which enable our heart to behave like a pump alternating flow exchange along with perfect sealing between the different chambers, can be targeted by disease inducing regurgitation, which can at its turn be deleterious to the heart. Regurgitation assessment, currently achieved using echocardiography in clinical routine, can be inaccurate in case of complex or eccentric regurgitant jets. In such cases, patients can be referred to Magnetic Resonance Imaging (MRI) to help for patient management and surgical decision making. Among contributive MRI sequences, 4D flow MRI, which enables visualizing the velocities in the cardiac volume according to the 3 space directions and during the entire cardiac cycle, can help in estimating both straightforward indices such as velocities as well as advanced hemodynamic indices such as pressure gradients. Of note, such 4D flow data are acquired with relevant anatomical cine images within the same exam.This thesis aims to develop dedicated methods to process both 2D and 4D MRI images and extract quantitative indices of mitral regurgitation. In such context, we sought to calculate quantitative MRI indices such as: : 1) the surface and the volume of the regurgitant jet, 2) velocities distribution and the orientation of the main and regurgitant jet to potentially identify the area of flow impact where mechanical stresses might be exerted on the myocardium, 3) a pressure gradients map within the left atrium in the areas surrounding the regurgitant jet, and 4) the temporal persistence of vortices created by the regurgitant jet.These flow data were estimated in conjunction with functional and geometric parameters such as myocardial deformation and atrioventricular angulation, derived from cine MRI images and then compared with echocardiographic measurements as well as with patient exercise capacity
Cheng, Wei. "What can information guess ? : Towards information leakage quantification in side-channel analysis". Electronic Thesis or Diss., Institut polytechnique de Paris, 2021. http://www.theses.fr/2021IPPAT044.
Pełny tekst źródłaCryptographic algorithms are nowadays prevalent in establishing secure connectivity in our digital society. Such computations handle sensitive information like encryption keys, which are usually very exposed during manipulation, resulting in a huge threat to the security of the sensitive information concealed in cryptographic components. In the field of embedded systems security, side-channel analysis is one of the most powerful techniques against cryptographic implementations. The main subject of this thesis is the measurable side-channel security of cryptographic implementations, particularly in the presence of random masking. Overall, this thesis consists of two topics. One is the leakage quantification of the most general form of masking equipped with the linear codes, so-called code-based masking; the other one is exploration of applying more generic information measures in a context of side-channel analysis. Two topics are inherently connected to each other in assessing and enhancing the practical security of cryptographic implementations .Regarding the former, we propose a unified coding-theoretic framework for measuring the information leakage in code-based masking. Specifically, our framework builds formal connections between coding properties and leakage metrics in side-channel analysis. Those formal connections enable us to push forward the quantitative evaluation on how the linear codes can affect the concrete security of all code-based masking schemes. Moreover, relying on our framework, we consolidate code-based masking by providing the optimal linear codes in the sense of maximizing the side-channel resistance of the corresponding masking scheme. Our framework is finally verified by attack-based evaluation, where the attacks utilize maximum-likelihood based distinguishers and are therefore optimal. Regarding the latter, we present a full spectrum of application of alpha-information, a generalization of (Shannon) mutual information, for assessing side-channel security. In this thesis, we propose to utilize a more general information-theoretic measure, namely alpha-information (alpha-information) of order alpha. The new measure also gives the upper bound on success rate and the lower bound on the number of measurements. More importantly, with proper choices of alpha, alpha-information provides very tight bounds, in particular, when alpha approaches to positive infinity, the bounds will be exact. As a matter of fact, maximum-likelihood based distinguishers will converge to the bounds. Therefore, we demonstrate how the two world, information-theoretic measures (bounds) and maximum-likelihood based side-channel attacks, are seamlessly connected in side-channel analysis .In summary, our study in this thesis pushes forward the evaluation and consolidation of side-channel security of cryptographic implementations. From a protection perspective, we provide a best-practice guideline for the application of code-based masking. From an evaluation perspective, the application of alpha-information enables practical evaluators and designers to have a more accurate (or even exact) estimation of concrete side-channel security level of their cryptographic chips
Demange, David. "Mesure non intrusive de l'activité de fûts de déchets tritiés par modélisation d'une fuite 3He et sa quantification par spectrométrie de masse". Besançon, 2002. http://www.theses.fr/2002BESA2016.
Pełny tekst źródłaCohen, Grégory. "Caractérisation, quantification et modélisation du transport et des interactions du CO2 dans une zone vadose carbonatée : application à une fuite diffuse de CO2 en contexte de séquestration géologique". Phd thesis, Université Michel de Montaigne - Bordeaux III, 2013. http://tel.archives-ouvertes.fr/tel-00976867.
Pełny tekst źródłaCohen, Grégory. "Caractérisation, quantification et modélisation du transport et des interactions du CO₂ dans une zone vadose carbonatée : application à une fuite diffuse de CO₂ en contexte de séquestration géologique". Thesis, Bordeaux 3, 2013. http://www.theses.fr/2013BOR30022/document.
Pełny tekst źródłaGlobal warming is related to atmospheric greenhouse gas concentration increase and especially anthropogenic CO₂ emissions. Geologic sequestration has the potential capacity and the longevity to significantly diminish anthropogenic CO₂ emissions. This sequestration in deep geological formation induces leakage risks from the geological reservoir. Several leakage scenarios have been imagined. Since it could continue for a long period, inducing environmental issues and risks for human, the scenario of a diffusive leakage is the most worrying. Thus, monitoring tools and protocols are needed to set up a near-surface monitoring plan. The present thesis deals with this problematic. The aims are the characterisation, the quantification and the modelling of transport and interactions of CO₂ in a carbonate unsaturated zone. This was achieved following an experimental approach on a natural pilot site in Saint-Emilion (Gironde, France), where diffusive gas leakage experiments were set up in a carbonate unsaturated zone. Different aspects were investigated during the study: natural pilot site description and instrumentation; the physical and chemical characterisation of carbonate reservoir heterogeneity; the natural functioning of the carbonate unsaturated zone and especially the set-up of a CO₂ concentrations baseline; the characterisation of gas plume extension following induced diffusive leakage in the carbonate unsaturated zone and the study of gas-water-rock interactions during a CO₂ diffusive leakage in a carbonate unsaturated zone through numerical simulations. The results show the importance of the carbonate reservoir heterogeneity characterisation as well as the sampling and analysing methods for the different phases. The baseline set-up is of main interest since it allows discrimination between the induced and the natural CO₂ concentrations variations. The transfer of CO₂ in a carbonate unsaturated zone is varying in function of physical and chemical properties. This transfer is done by diffusion and/or advection. Because the detection of the noble gases allows the prediction of CO₂ plume arrival, the use of tracers in the sequestration site is of main importance. The chemical interactions have to be taken under account in transport models in order to predict delay factors and the impact of a CO₂ leakage in a carbonate unsaturated zone
Rhino, Kévins. "Caractérisation, quantification et modélisation des processus de transfert et des interactions CO₂-eau-roche en milieu poreux non saturé en contexte de forage lors d'un stockage géologique". Thesis, Bordeaux 3, 2017. http://www.theses.fr/2017BOR30040/document.
Pełny tekst źródłaCarbon storage is one of the most encouraging methods to decrease CO₂ concentration into the atmosphere. Carbon storage provides the longevity and the capacity needed to decrease CO₂ emissions toward the atmosphere. When dealing with storage on an industrial scale, carbonated reservoirs can be among the most suitable storage sites. However, these high depth injections are subject to leakage risks from the geologic trap itself or from the framework created by the establishment of the site. Two main types of leakage exist: brutal and diffusive leakage. In both cases, they are likely to endanger the environment and the population. Therefore, it is essential to develop tools that are able to anticipate any types of CO₂ leakage. Furthermore, it is also necessary to understand the reactive transport mechanism that take place when the leakage arrives in the shallow subsurface (vadose zone)and to see how the leakage can be buffered. This work deals with the characterization, the quantification and the modelling of transfer processes and CO₂-H₂O-CaCO₃ interactions into the vadose zone in a context of a leakage from a drilling well. This issue was first dealt through field experiment on the site of Saint Emilion. Then, the CO₂-H₂O-CaCO₃ interactions were studied through an experimental approach in laboratory. Two leakage experiments were performed on the site: a diffusive leakage and an ultra-diffusive leakage. They were performed as a sequel of former experiments carried on the pilot site. A comparison of all the leakage experiments revealed the necessity to use noble gases as precursor of the CO₂ arrival at the surface. Depending of the type of the leakage, helium can be a temporal precursor while krypton can anticipate the spread of the CO₂ gas plume. The higher the injection pressure, the more the gas migrates through advective flux. Moreover, a high injection pressure favors the existence of preferential paths in the vadose zone. The use of helium and carbon isotopes makes it possible to reveal the presence of a local aqueous phase within the porous media and to identify the origin of CO₂. The core scale experiments lead to the estimation of the buffering power of Oligocene limestone according to the rock facies. The permeability and the porosity influence the dissolution of the limestone. The reactivity of carbonates during a leakage depends on the pH of the aqueous phase, the flow rate that goes through the porous media, the water saturation and petrophysical characteristics of the carbonates