Teses / dissertações sobre o tema "Irradiartion aux ions lourds"
Crie uma referência precisa em APA, MLA, Chicago, Harvard, e outros estilos
Veja os 50 melhores trabalhos (teses / dissertações) para estudos sobre o assunto "Irradiartion aux ions lourds".
Ao lado de cada fonte na lista de referências, há um botão "Adicionar à bibliografia". Clique e geraremos automaticamente a citação bibliográfica do trabalho escolhido no estilo de citação de que você precisa: APA, MLA, Harvard, Chicago, Vancouver, etc.
Você também pode baixar o texto completo da publicação científica em formato .pdf e ler o resumo do trabalho online se estiver presente nos metadados.
Veja as teses / dissertações das mais diversas áreas científicas e compile uma bibliografia correta.
Dujarrier, Alexis. "Effet de la micrοstructure οbtenue par fabricatiοn additive sur le vieillissement sοus irradiatiοn d'alliages ΝΙ-20CR". Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMC231.
Texto completo da fonteAdditive Manufacturing (AM) of metals is an advanced technology that enables rapid implementation and design optimization of complex parts. It is now used in many industrial sectors, including nuclear. One of the most common processes in AM is Laser Powder Bed Fusion, which results in a particular microstructure that could influence the material's response to irradiation. The objective of this thesis was to study the effect of heavy ion irradiation on the microstructure of AM Ni-20Cr using Transmission Electron Microscopy (TEM), as well as its impact on its mechanical properties, to determine whether AM could be used for nuclear applications. For this purpose, three additive manufacturing strategies and the effect of annealing were studied and compared to a reference material. Various heavy ion irradiation experiments were conducted, on bulk samples as well as on thin foils observed via in situ TEM. In situ experiments allow measuring the defect growth kinetics at low doses and tracking the evolution of certain characteristics.It is thus demonstrated that in all samples, irradiation induces the formation of Frank loops and perfect loops. The manufacturing strategy does not influence the microstructure evolution of AM samples. However, the dendritic cells, characteristic of AM, are dissolved under irradiation. Additionally, a lower density of dislocation loops is measured in the AM samples compared to the annealed and reference samples that show a similar evolution. This is explained by a higher density of defect sinks in the as built AM material. The observed microstructural evolution is linked to the mechanical properties, which are measured by micropillar compression. It is shown that the annealed and reference materials experience an increase in their critical resolved shear stress due to the creation of dislocation loops, whereas the AM material show a decrease due to the dissolution of dislocation cells, superior to the hardening component. These changes are confirmed by the application of the dispersed barrier-hardening model
Provost-Grellier, Antoine. "Test aux ions lourds de VLSI programmables". Grenoble INPG, 1989. http://tel.archives-ouvertes.fr/tel-00334460.
Texto completo da fonteProvost-Grellier, Antoine Velazco Raoul. "Test aux ions lourds de VLSI programmables". S.l. : Université Grenoble 1, 2008. http://tel.archives-ouvertes.fr/tel-00334460.
Texto completo da fonteHamrita, Hassen. "Réponse en courant des détecteurs silicium aux particules chargées et aux ions lourds". Phd thesis, Université Pierre et Marie Curie - Paris VI, 2005. http://tel.archives-ouvertes.fr/tel-00010145.
Texto completo da fonteVu, Thi Hai Yen. "Simulation du Comportement sous Irradiation aux Ions Lourds du Nanocomposite Au-SiO2". Palaiseau, Ecole polytechnique, 2015. https://tel.archives-ouvertes.fr/tel-01265991/document.
Texto completo da fonteMetal-glass nanocomposites are interesting owing to their particular optical-properties. Ion irradiation can be used as a tool to fabricate nanocomposites. The aim of this thesis was to study, from a fundamental point of view, the behavior of gold nanoparticles (NPs) embedded in an amorphous silica matrix under irradiation. My contribution consists in the interpretation, by modeling and numerical simulation, of experimental results previously obtained by researchers of the Laboratoire des Solides Irradiés. In a first type of experiments, the system was irradiated with 4 MeV gold ions while in a second type the irradiation was performed by using 74 MeV krypton ions. For the study of the first type of experiments, the simulation by kinetic Monte Carlo (KMC) on rigid lattice was chosen and developed specifically to study the behavior of NPs irradiated at different temperatures. The simulations allows us to reproduce qualitatively the experimental results at any temperature. We found that the system evolves within a direct coarsening regime at high temperature (T>900 K) whereas at low temperatures (T<600 K) it becomes resistant to coarsening and the NPs dissolve. A transition regime is observed between 600 K and 900 K. The KMC simulation highlights and explains an effect of the size of the NPs on their dissolution under irradiation. It also demonstrated that unidirectional ballistic models could account for the law of dissolution. A model based on the theoretical approach of Frost and Russel including a size-dependent recoil generation rate fully describes the dissolution for any NP size. In the second type, the system evolves in the electronic energy deposition regime. Depending on their size, the NP can be vaporized (diameter<10 nm), transformed into nanorod (10-30 nm) or faceted NP (30-60 nm) or slightly deformed (>60 nm) by the incident ions. We imagined a scenario for the mechanism of deformation which is based on the thermal expansion of the melted NP into the track produced by the incident ion in the matrix. Its implementation using a new simulation technique helped to refine certain elements of the scenario and to improve the overall understanding of the process. The qualitative agreement between the experimental data and the results obtained by the simulation validate the proposed mechanism
Vinet, Loïc. "Approche semi-classique de la physique des ions lourds aux énergies intermédiaires". Paris 11, 1986. http://www.theses.fr/1986PA112199.
Texto completo da fonteThe study of heavy ion collisions at intermediate energies (10 to 100 MeV/A), can be undertaken by a semi-classical approach: the nuclear Vlasov equation. It is possible to decompose the one body distribution function over a suitable coherent state basis for dynamical studies. This method is applied for colliding slabs, and the results are compared with those of TDHF. With imposed spherica1 symmetry, the isoscalar monopole resonance, evaporation, formation of bubble nuclei and total evaporation, are obtained. The extension to three dimensions and to the Landau-Vlasov equation through the residual interaction included in the Uehling-Uhlenbeck collision term permits a general study of the dynamical instability of highly excited nuclei. The application to heavy ion collisions gives a description of bath the main mechanisms of reaction, and the ineffective fusion for the system 40Ar (35 MeV/A) + 27Al. Alpha particle multiplicities in correlation with evaporated residues in the experience 40Ar (27 MeV/A) +27Al, have been extracted. From theoretical results, different scenario are proposed (entrance channel limitation and exit channel disintegration), in order to explain the disappearance of the fusion component observed for this system at energies above 32 MeV/A
Vinet, Loïc. "Approche semi-classique de la physique des ions lourds aux énergies intermédiaires". Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb37601731t.
Texto completo da fonteBouillaud, Pascal. "Irradiation aux ions lourds de films minces nanocristallins d'alliages FeCo et FeAl". Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37612171v.
Texto completo da fonteBlumenfeld, Yorick. "Collisions périphériques d'ions lourds induites par ⁴⁰ Ar aux énergies intermédiaires : résonances géantes, structures à haute énergie et fragmentation du projectile". Paris 11, 1987. http://www.theses.fr/1987PA112405.
Texto completo da fonteThis work concerns the study of peripheral heavy ion reactions induced by 40Ar beams at intermediate energies. The results obtained ln similar studies at low incident energies are first of all reviewed. The time of flight spectrometer built for the experiments is then described. It performances allow an excellent charge and mass separation of the reaction products and a good energy resolution. A study of the properties of the projectile-like fragments shows numerous deviations from the relativistic energy fragmentation modal. Evidence for a strong surface transfer reaction component is given and the persistence of mean field affects at Intermediate energies is stressed. A calculation of the contribution of the transfer evaporation mechanism to the inelastic spectra shows that this mechanism is responsible for the major part of the background measured at high excitation energy and can in same cases induce narrow structures in the spectra. The inelastic spectra show a strong excitation of the giant quadrupole resonance. In the region between 20 and 80 MeV excitation energy narrow structures are present for all the studied systems. Statistical and Fourier analyses allow to quantify the probabilities of existence, the widths and the excitation energies of these structures. A transfer evaporation hypothesis cannot consistently reproduce all the observed structures. The excitation energies of the structures can be well described by phenomenological laws where the energies are proportional to the -113 power of the target mass. Complete calculations of the excitation probabilities of giant resonances and multiphonon states are performed within a modal where the nuclear excitation is calculated microscopically ln the Random Phase Approximation. It is shown that a possible Interpretation of the structures is the excitation of multiphonon states built with 2+ giant resonances
Tisserand, Raphaël. "Caractérisation de l'endommagement de matériaux apatitiques irradiés aux ions lourds et recuits thermiquement". Phd thesis, Université de Franche-Comté, 2004. http://tel.archives-ouvertes.fr/tel-00008573.
Texto completo da fonteDammak, Hichem. "Changement de phase cristalline induit par irradiation aux ions lourds rapides dans un métal pur". Palaiseau, Ecole polytechnique, 1994. http://www.theses.fr/1994EPXX0005.
Texto completo da fonteLeray, Sylvie. "Étude du transfert incomplet d'impulsion dans les réactions entre ions lourds aux énergies intermédiaires". Paris 11, 1986. http://www.theses.fr/1986PA112152.
Texto completo da fonteLeray, Sylvie. "Etude du transfert incomplet d'impulsion dans les réactions entre ions lourds aux énergies intermédiaires". Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb37599167s.
Texto completo da fonteDammak, Hichem. "Changement de phase cristalline induit par irradiation aux ions lourds rapides dans un métal pur /". Gif-sur-Yvette : Service de documentation et d'édition multimédia, Centre d'études de Saclay, 1994. http://catalogue.bnf.fr/ark:/12148/cb35771191c.
Texto completo da fonteLopez-Martens, Araceli. "Structure Nucléaire aux Extrêmes de Déformation et de Charge". Habilitation à diriger des recherches, Université Paris Sud - Paris XI, 2010. http://tel.archives-ouvertes.fr/tel-00460473.
Texto completo da fonteBouttet, Denis. "Mécanismes de fluorescence et de scintillation dans des cristaux inorganiques lourds dopés aux ions Ce3+ et Pr3+". Lyon 1, 1995. http://www.theses.fr/1995LYO10284.
Texto completo da fonteSchlösser, Dominik. "Modifications des transitions de phase dans les polymères ferroélectriques soumis à une irradiation aux ions lourds rapides". Palaiseau, Ecole polytechnique, 1995. http://www.theses.fr/1995EPXX0044.
Texto completo da fonteMoisy, Florent. "Etude des modifications induites dans les semiconducteurs AlxGa1-xN par irradiation aux ions lourds de haute énergie". Caen, 2016. https://hal.archives-ouvertes.fr/tel-01843596.
Texto completo da fonteNitride semiconductors are attractive materials for optoelectronic applications. They can be subjected to heavy ions in a wide range of energy during their elaboration (improvement of their properties by ionic implantation) or during their potential use in extreme environments (outer space). This thesis focuses on the study of AlxGa1-xN alloys under heavy ion irradiation from GANIL. In GaN, the formation of Ga vacancies has been highlighted, these latter coming from elastic collisions between atoms in the material and the projectiles. On the other hand, it is possible to observe the formation of disordered ion tracks for projectiles with high electronic stopping power (Se). These tracks induce strong surface modifications, a closing of the optical bandgap, but also an extension strain along the direction parallel to the ion direction and biaxial stresses of some GPa. Concerning AlxGa1-xN alloys with x from 0. 3 to 1, the points defects are more complex, and a synergy between electronic excitations and nuclear collisions is responsible of their formation. Nevertheless, the increase of the Al molar fraction (x), tends to improve the resistance to ion tracks formation in these materials
Porteboeuf, Sarah. "Étude des processus durs dans les collisions proton-proton et noyau-noyau aux énergies LHC". Nantes, 2009. http://www.theses.fr/2009NANT2064.
Texto completo da fonteCollisions of high energy particles are useful to probe the elementary structure of matter: partons (quarks and gluons). Ultra relativistic heavy ion collisions produce in the same event a so-called Quark-Gluon Plasma (QGP) as well as elementary parton-parton interaction. Those interactions, called hard processes, originate from the very first moment of the collision, and produce high transverse momentum partons which then decay into observable hadrons (jets). Before this ���hadronization”, the partons may interact with the QGP, which modifies the hadron properties. Studying hard processes will be an important issue at LHC. Jet production cross sections can be computed within the pQCD framework. The EPOS formalism tends to compute full events which are directly comparable to experimental events, reproducing the soft part (QGP) as well as the hard part in a coherent model. In this manuscript, I will motivate the realization of hard processes in a complete event. The hard part should be compatible with the results from pQCD. Doing so, as in experiment, production of rare processes needs large statistics. I will therefore introduce method allowing to trigger on high transverse momentum events, to easily produce rare event in the context of soft particles
Garrido, Frederico. "Etude par microanalyse nucleaire du transport atomique dans un solide amorphe irradie aux ions lourds de haute energie". Paris 11, 1994. http://www.theses.fr/1994PA112212.
Texto completo da fontePARISELLE, MARC ANTOINE. "Etudes des mecanismes de formation des defauts de type v dans les iodures alcalins irradies aux ions lourds". Nantes, 1995. http://www.theses.fr/1995NANT2009.
Texto completo da fonteMIKOU, MOHAMMED. "Defauts crees par irradiation aux ions lourds rapides dans l'arseniure de gallium : etude par effet hall et photoluminescence". Caen, 1995. http://www.theses.fr/1995CAEN2018.
Texto completo da fonteSousa, Rui de. "Contribution à l'étude de la physique des vortex dans le supraconducteur fortement lamellaire Bi2Sr2CaCu2O8 irradié aux ions lourds". Tours, 2001. http://www.theses.fr/2001TOUR4005.
Texto completo da fonteDarracq, Frédéric. "Caractérisation à l'aide d'un laser impulsionnel de la sensibilité des circuits intégrés aux effets singuliers : méthodologie de tri préliminaire des composants SRAM commerciaux". Bordeaux 1, 2003. http://www.theses.fr/2003BOR12681.
Texto completo da fonteThis work concerns the elaboration of an industrial method for Single Event Effect (SEE) sensitivity testing on integrated circuits. The concerned SEEs are those produced by heavy ions and are mainly Single Event Upset (SEU) and Single Event Latchup (SEL). The original test approach chosen in this study relies on the use of infrared laser pulses striking the backside of the tested device. Laser pulse and heavy ion interaction with semiconductor materials are described and a presentation of the particle accelerator test and some former laser test methods is also given. Advantages and drawbacks of those two techniques are discussed. The developed experimental setup uses a near infrared fiber coupled Neodyme/YAG pulsed laser. Its different elements are described. Using this tool to characterise the SEU sensitivity of several modern SRAMs has allowed to define a test methodology. Its efficiency is discussed and illustrated by different experimental results
BELLOT, THIERRY. "Etude des mecanismes de reaction entre ions lourds aux energies vivitron a l'aide du multidetecteur de particules chargees icare". Université Louis Pasteur (Strasbourg) (1971-2008), 1997. http://www.theses.fr/1997STR13231.
Texto completo da fonteMoustabchir, Rachid Demeyer Albert Roy René. "Recherche d'une signature de phénomènes critiques et des effets dynamiques lors des collisions entre ions lourds aux énergies de Fermi". Villeurbanne : Université Claude Bernard, 2004. http://tel.archives-ouvertes.fr/docs/00/04/78/01/PDF/tel-00008654.pdf.
Texto completo da fonteThèse soutenue en co-tutelle. Titre provenant de l'écran titre. 113 réf. bibliogr.
Moustabchir, Rachid. "Recherche d'une signature de phénomènes critiques et des effets dynamiques lors des collisions entre ions lourds aux énergies de Fermi". Phd thesis, Université Claude Bernard - Lyon I, 2004. http://tel.archives-ouvertes.fr/tel-00008654.
Texto completo da fonteTomasi-Gustafsson, Egle. "Étude des réactions de stripping d'un nucléon induites par ions lourds aux énergies de quelques dizaines de MeV par nucléon". Paris 11, 1988. http://www.theses.fr/1988PA112144.
Texto completo da fonteWe have studied at the GANIL facility (Caen) the one-nucleon stripping reactions (¹ ² C,¹ ¹ C) and (¹ ² C,¹ ¹ B) on a ²⁰⁸Pb target at an incident energy of 480MeV. We have analysed the energy spectra up to 15 MeV excitation energy. The energy resolution obtained with the energy loss magnetic spectrometer SPEG was 200 keV FWHM. The comparison with similar reactions induced by 160 on ²⁰⁸Pb at 793 MeV gives experimental evidence of the population of the excited discrete levels in terms of two selection rules : 1) High spin states are selected ; 2) the most populated states correspond to no spin-flip transitions. These rules are well understood in the semi-classical model of D. M. Brink, and are contained in the Exact Finite Range-Distorted Wave Born Approximation (EFR-DWBA) formalism. The angular distributions of the observed states were measured between 2° and 9° in the laboratory system. The EFR-DWBA calculations reproduce fairly well their shape, allowing us to extract spectroscopic factors in agreement with those previously known. EFR-DWBA calculations for ¹ ² C induced reactions reproduce also the absolute values of the cross sections for all the analysed states, while for the reaction induced by l6O the theory overestimates the experimental values by a factor of five to ten. A detailed study of the influence of the various parameters was carried out: the optical model parameters extracted from elastic scattering, which was also measured, and the form factor parameters, which were taken from previous studies at lower incident energy for the same system. The EFR-DWBA absolute cross sections are found to be very sensitive to the optical potential reduced radius, which, on the other hand, doesn't affect much the shape of the transfer reaction angular distributions. Moreover, between 4 and 10 MeV excitation energy, broad peaks and large structures have been observed, which are attributed to the excitation of high spin states which are fragmented into many components. We have looked at the effect of a spin-orbit term in heavy ion reactions at high energy. Polarization measurements are necessary to determine without ambiguities if this term does or does not play an important role, as we might expect from the fact that the angular momenta involved in the reactions investigated here are very large
Tomasi-Gustafsson, Egie. "Etude des réactions de stripping d'un nucléon induites par ions lourds aux énergies de quelques dizaines de MeV par nucléon". Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb376188779.
Texto completo da fonteDavid, Laurent. "Développement de la microscopie thermique à sonde locale pour la détermination de la conductivité thermique de films minces : application aux céramiques pour le nucléaire". Lyon, INSA, 2006. http://theses.insa-lyon.fr/publication/2006ISAL0065/these.pdf.
Texto completo da fonteLn order to understand and characterize the phenomena of transport of thermal energy at microscopie and submicroscopic scales, Thermal Scanning Probe Microscopy (SThM) is promising. Based on the analysis of the thermal interaction between an heated probe and a sample, it permits to probe the matter at the level of micrometrie size in volumes. This work more particularly relates to the study ofthin films thermal conductivity. We propose a new modelling of the prediction of measurement. This model allows not only the calibration of the method for the measurement of bulk material thermal conductivity but also to specify and to better describe the probe - sample thermal coupling and to estimate, from its inversion, thin films thermal conductivity. This new approach of measurement has allowed the determination of the thermal conductivity of micrometrie and submicrometric thicknesses of mesoporeux silicon thin film. For the lower thicknesses of film, we give new data. Our mode] has allowed a better definition of the in-depth resolution of the apparatus. We also developed the technique by the vacuum setting of SThM. Our first results are encouraging and validate the description of the coup ling used in our model. Our method was applied to the study of ceramics under consideration in the composition of future nuclear fuels. Because of the limitations of SThM in terms of sensitivity to thermal conductivity and in-depth resolution, measurements were also undertaken with a modulated thermoreflectance microscope. Our results permit to propose a first estimate of the degradation of the thermal conductivity, caused by an irradiation with energy heavy ions, of the ceramics considered
David, Laurent Gomès Séverine Raynaud Martin. "Développement de la microscopie thermique à sonde locale pour la détermination de la conductivité thermique de films minces application aux céramiques pour le nucléaire /". Villeurbanne : Doc'INSA, 2007. http://docinsa.insa-lyon.fr/these/pont.php?id=david_l.
Texto completo da fonteGrenier, Adeline. "Etude à l’échelle atomique de multicouches magnétostrictives TbFe/Co et TbFeCo/Fe : structure, propriétés et effet de l’irradiation aux ions lourds". Rouen, 2008. http://www.theses.fr/2008ROUES045.
Texto completo da fonteFor the first time, the tomographic atom probe allowed the chemical study at the atomic scale of magnetostrictives multilayers (TbFe2 5nm/Co3 ou 7 nm)x20 and the study of their modifications induced by swift heavy ion irradiation. It revealed the asymmetry of the interfaces. The cobalt diffusion, under irradiation, was interpreted by the inelastic thermal spike model. Depth magnetization profiles were deducted from the concentration profiles of allowed to understandthe increase of the magnetic properties under irradiation. The reversal of magnetization was studied according to various parameters by polarized neutron reflectometry. Tjis study showed that during a parallel configuration of magnetizations, the domain walls are mainly located in the TbFeCo layer. A exchange bias was put in evidence at 100K whose the sign depends on cooking field and then on the initial configuration of the TbFeCo layer
Sebille, François. "Approche semi-classique de la dynamique des ions lourds aux énergies intermédiaires, fondements théoriques et application à l'émission de particules légères". Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb37601103x.
Texto completo da fonteMostefaï, M'Hamed. "Étude des collisions centrales dans les réactions induites par ions lourds aux énergies intermédiaires par la méthode des corrélations angulaires des fragments de fission". Paris 11, 1987. http://www.theses.fr/1987PA112196.
Texto completo da fonteHeavy ion collisions are studied in the ferrmi energy domain by means of the angular correlation method which allows to determine the amount of transferred linear momentum. Fragment mass measurements permit to deduce the excitation energies reached in the residual nuclei. The present results essentially deal with reactions, induced on a thorium Target by an argon beam from 31 to 44 mev per nucleon and by a nickel beam from 20 to 30 mev per nucleon. With the thorium target, the angular correlations show two components, One due to the sequential fission of the target, the ether due to the central collisions, the contribution of which decreases with the incident energy. The transferred linear momentum for these central collisions does not correspond to the full transfer but shows a limitation well reproduced by a simple model taking into account the nucleon-nucleon interaction and by a preequilibrium emission model. This last calculation predicts also the excitation energies and the mass of the composite systems in agreement with the mass measurements. The shapes of the angular correlations and their evolution with bombarding energy are qualitatively explained through an abrasion-ablation model. However, the experimental data do not permit a discrimination between an excitation energy limitation in the residual nuclei and entrance channel properties to be responsible of the central collision disappearance. One suggests an explanation of the high transfers in terms of two mechanisms: one due to peripheral collisions stable with the incident energy, the other one arising from central collisions for which the larger compression would lower the critical temperature and so decrease the cross section
Lavergne-Gosselin, Laurence. "Étude de détecteurs nucléaires minces, passivés et implantés, réalisés à partir de silicium épitaxique : applications aux ions lourds et au rayonnement synchrotron". Paris 11, 1989. http://www.theses.fr/1989PA112094.
Texto completo da fonteSalager, Laurent. "Conception en vue du durcissement des circuits intégrés numériques aux effets radiatifs". Montpellier 2, 1999. http://www.theses.fr/1999MON20030.
Texto completo da fonteJuraszek, Jean. "Dommages induits par irradiation aux ions lourds dans des matériaux magnétiques : multicouches metalliques Fe/Tb et grenat isolant Y 3Fe 5O 1 2". Rouen, 2000. http://www.theses.fr/2000ROUES016.
Texto completo da fonteKohler, Pierre. "Méthodes de caractérisation et analyse de la sensibilité aux effets des radiations de mémoires dynamiques basse consommation pour application spatiale". Thesis, Montpellier, 2018. http://www.theses.fr/2018MONTS003.
Texto completo da fonteElectronic components, embedded in space applications, are exposed to different types of particles that make up the space radiation environment. The individual or cumulative interaction of these particles with the integrated circuits materials is the source of single-event effects or dose effects that can alter the reliability of the systems by inducing different types of failures at basic electronic functions level and threaten the mission success. In order to predict the event rate during a mission or the components lifetime in a radiative environment, prior to their integration into a space application, it is necessary to model these failures and to characterize the functioning of the components under irradiation.In this context, the objectives of this thesis are the development and implementation of models and methods for characterizing the sensitivity of DDR3 SDRAM memories to the radiation effects for their future integration into memory modules for space applications. The development of a functional and parametric test bench compatible with various irradiation facilities is presented. Results obtained under gamma radiation, are analyzed, and supplemented by sensitivity estimation using X-rays. A characterization campaign under heavy ions, combined with laser testing, allows us to present comparative analysis of the components SEE sensitivity. The complementarity of these
Barrès, Quentin. "Effet de la structure des joints de grains sur le phénomène de ségrégation induite par irradiation aux ions lourds dans un alliage Fe-13Cr". Thesis, Normandie, 2020. http://www.theses.fr/2020NORMR072.
Texto completo da fonteFerritic / Martensitic steels (F/M) and ODS steels are candidates as structural and cladding materials for future generations of reactors (GEN IV & Fusion). Indeed, these alloys have very good mechanical properties and corrosion resistance. However, under irradiation, materials are subjected to a flux of defects which promote Irradiation-Induced Segregation (IIS) at sinks. This non-equilibrium segregation change the local composition of the material around sinks, such as grain boundaries. This modification of the composition will have drastic effects on materials properties. Many parameters related to the material as well as the irradiation conditions can influence IIS. This study focused on the effect of grain boundaries structure on IIS in a Fe-Cr model alloy. The aim is to quantify the effects of grain boundary structure on IIS in a Fe-13at.%Cr alloy. The first step was to set up an experimental processin order to be able to characterize a grain boundary using atom probe tomography (APT). The grain boundary need to be fully characterized according to its five degrees of freedom (5 DoF) using electron diffraction techniques EBSD / TKD. Analyzes are performed before and after irradiation in order to dissociate IIS from the equilibrium segregation on grain boundaries. Finally, to improve the representativeness of the results, each analyze was doubled or tripled. To reach an enrichment of chromium at grain boundaries, ions irradiation have been conducted with Fe5 + ions, at 450 °C, and at low damage rate (6.10-5 dpa.s-1 ).. Effects of grain boundaries structure on IIS have been shown by APT analyzes in a Fe-13%Cr alloy. Different kind of grain boundaries structure have been test for a dose of 2 dpa. Effects of grain boundaries plans orientation have been quantify on APT in two different Σ3 (60° ) coincidence grain boundaries. A W-shape composition profile is systematically observed on Cr profiles made across grain boundaries. This chromium segregation is paired to a carbon segregation that lead to heterogeneous segregation / precipitation in the plane of the grain boundaries. These precipitates rich in chromium and carbon are likely to be the first step of carbide formation. Monte Carlo simulations (AKMC) can reproduce IIS phenomenon on a Fe-Cr alloy under the same irradiation conditions as explored experimentally in this study. Grain boundary structure, sinks density and ballistic effects have been prove qualitatively by these simulations. However, chromium W-shape composition profile can’t be obtain with this binary Fe-Cr simulation. This supports the hypothesis that carbon plays an important role in the formation of this atypical profile
Mostefaï, M'Hamed. "Etude des collisions centrales dans les réactions induites par ions lourds aux énergies intermédiaires par la méthode des corrélations angulaires des fragments de fission". Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37608182r.
Texto completo da fontePhulpin, Tanguy. "Contribution à l'analyse des mécanismes de défaillance lors de décharges électrostatiques et de radiations aux ions lourds de composants MESFET en carbure de silicium". Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30049/document.
Texto completo da fontePower management is nowadays crucial with the global warming and the electronic needs of the society. Wideband gap semi-conductors like Silicon Carbide (SiC) are emerging in power electronic landscape because of their better properties in comparison with Silicon. Nevertheless reliability and knowledge about internal physic during electrostatic discharge (ESD) or radiation event is still missing and need specific studies. In this work, several SiC MESFET have been tested and results show two mains failure mechanism. First the passivation oxide clamping, and secondly the SiC sublimation induced by a parasitic structure in the device. An ESD protection was tested and validated. Unfortunately, this solution isn't efficient for heavy ion protection. Indeed, no impact on the radiation robustness is noticed on the MESFET during a radiation event. SiC ESD reliability doesn't look better than for Silicon devices. ESD robustness improvements are proposed in this work even if integration of this MESFET is still required to validate the improvement
Monnet, François. "Système de détection à large acceptance angulaire et grande dynamique en énergie destiné à la physique des ions lourds aux énergies intermédiaires : détecteur M.E.Ω [oméga]". Paris 11, 1985. http://www.theses.fr/1985PA112156.
Texto completo da fonteBuilt for intermediate energy heavy ions nuclear physics, the M. E. Ω detector uses various and complementary detection methods: ionization chamber, parallel plate avalanche counter, plastic scintillators. With these techniques, velocity, energy, mass and charge of nuclei were measured over wide range. From the detailed theoretical study of each method, limitations and perturbation causes are deduced. The solutions used for optimizing the detector, and the main results are exposed. The internal sectorisation of the detector, which permits a modulation in counting rate and electronical adjustments, has been revealed to be very suitable for heavy ions intermediate energy physics. Results of the first experiment realized with M. E. Ω (Ar + Ag at 35 MeV/u) are commented
Assoum, Ammar. "Etude de la tolérance aux aléas logiques des réseaux de neurones artificiels". Phd thesis, Grenoble INPG, 1997. http://tel.archives-ouvertes.fr/tel-00004913.
Texto completo da fonteNouicer, Rachid. "Signatures d'un Nouvel État de la Matière Nucléaire "Fluide Quasi Parfait de Quarks et de Gluons" dans les Collisions des Ions Lourds aux Énergies du RHIC". Habilitation à diriger des recherches, Université de Strasbourg, 2013. http://tel.archives-ouvertes.fr/tel-00925262.
Texto completo da fontePaccou, Elie. "Etude de l'évolution des propriétés mécaniques et de la sensibilité à la fissuration intergranulaire en fonction de la microstructure d'irradiation d'un acier 304 irradié aux ions lourds". Thesis, Toulouse 3, 2019. http://www.theses.fr/2019TOU30119.
Texto completo da fonteIASCC is a phenomenon of embrittlement observed in stainless austenitic steels used as internal structural elements of PWRs. The magnitude and the characteristics of the phenomenon depend on the material, the PWR environment, the neutron irradiation and the mechanical stresses that these elements undergo. The degradation of one of these contributors makes it possible to limit or eliminate the sensitivity to intergranular cracking. Although contributors such as deformation localization and intergranular segregation have been identified, the role of the irradiation microstructure on the susceptibility to this phenomenon of a material is not fully established. The role of irradiation nanocavities on IASCC, especially those located at grain boundaries is questioned. In this thesis, a 304L stainless steel austenitic was subjected to different irradiation conditions in order to determine the influence of the hardening, the localization and the effect of the irradiation cavities on the embrittlement of this material. The steel samples were irradiated with 10 MeV iron ions with or without helium and under two different temperatures, 450 ° and 600 ° C. These parameters made it possible to modify the microstructures of irradiation. The size and density of the cavities and the Frank loops generated are linked to the irradiation conditions employed. The study of the susceptibility of the irradiated samples has shown that the microstructure that underwent the strongest hardening is the most sensitive to intergranular cracking, although this susceptibility may appear after a weak hardening. The irradiation microstructure, in particular the presence of cavities, seems to reduce the sensitivity to cracking by limiting the location of the deformation or by their softening effect. In this study, the presence of cavities at grain boundaries does not increase sensitivity to intergranular cracking. For the study of radiation-induced hardening, we have developed and realized in situ microcompression tests in SEM on ion-irradiated materials. These simple slip tests show a significant effect of the size of unirradiated micropiliers, which is attenuated or completely annihilated by the hardening effect of the irradiation microstructure. These microcompression tests lead to results consistent with those established by nanoindentation. To better understand the localization effect of the deformation, we varied the grain size of the material under study. When this decreases, the deformation concentrates even more on grains with strong Schmid factors. In addition, the sensitivity to cracking decreases as the grain size increases, showing an effect of the ratio between the irradiation depth and the average grain size
Clochard, Marie-Claude. "Des polymérisations classiques en solution aux polymérisations radio-induites contrôlées en milieu confiné". Habilitation à diriger des recherches, Université Pierre et Marie Curie - Paris VI, 2013. http://tel.archives-ouvertes.fr/tel-00823555.
Texto completo da fontePorteboeuf, Sarah. "Etude des processus durs dans les collisions proton-proton et noyau-noyau aux énergies LHC". Phd thesis, Université de Nantes, 2009. http://tel.archives-ouvertes.fr/tel-00436909.
Texto completo da fonteChouard, Nolwenn. "Structure, stabilité thermique et résistance sous irradiation externe de verres aluminoborosilicatés riches en terres rares et en molybdène". Phd thesis, Université Pierre et Marie Curie - Paris VI, 2011. http://pastel.archives-ouvertes.fr/pastel-00644194.
Texto completo da fonteAFIF, ABDELMJID. "Etude par marquage radicalaire de polymeres aux interfaces application a la determination de l'epaisseur de la couche, de la cinetique d'adsorption et des proprietes separatives pour les ions lourds". Paris 6, 1999. http://www.theses.fr/1997PA066594.
Texto completo da fonteD'Enterria, David. "Bremsstrahlung thermique comme sonde de la multifragmentation nucléaire dans les collisions noyau-noyau aux énergies de Fermi". Phd thesis, Université de Caen, 2000. http://tel.archives-ouvertes.fr/tel-00202019.
Texto completo da fonteNos résultats confirment l'origine dominante des photons durs comme étant due au rayonnement de freinage émis dans les collisions proton-neutron (pn gamma) de première chance (hors équilibre). Nous établissons aussi de façon définitive l'existence d'une composante de radiation thermique dans le spectre photon mesuré dans les sytèmes lourds, et attribuons son origine au rayonnement de freinage émis dans les collisions p-n de deuxième-chance.
Nous exploitons cette observation pour i) démontrer que la matière nucléaire atteint un équilibre thermique lors de la réaction, ii) valider un nouveau thermomètre basé sur les photons du rayonnement de freinage, iii) déduire les propriétés thermodynamiques de la matière nucléaire chaude (en particulier, pour établir la "courbe calorique") et iv) évaluer les échelles de temps du processus de fragmentation nucléaire.