Дисертації з теми "Mécanisme de déclenchement"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-22 дисертацій для дослідження на тему "Mécanisme de déclenchement".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
Bissonnette, Nathalie. "Mécanisme de déclenchement de l'apoptose par des lésions à l'ADN protection par l'induction de l'expression de p21(Waf1/Cip1)." Thèse, Université de Sherbrooke, 1998. http://savoirs.usherbrooke.ca/handle/11143/4117.
Ghira, Zinho Antunes Maria Francisca. "Un modèle et un mécanisme d'éxécution pour les bases de données actives." Grenoble 1, 1991. https://theses.hal.science/tel-00009427.
Bissonnette, Nathalie. "Mécanisme de déclenchement de l'apoptose par des lésions à l'ADN, protection par l'induction de l'expression de p21[exposant W][exposant a][exposant f][exposant 1][exposant /][exposant C][exposant i][exposant p][exposant 1]." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape10/PQDD_0024/NQ56989.pdf.
El, Tannoury Claude. "Mécanismes de déclenchement des avalanches granulaires humides." Thesis, Rennes 1, 2018. http://www.theses.fr/2018REN1S125/document.
The dynamics of avalanche triggering in a slowly inclined granular medium passes through three phases; (1) small local and independent rearrangements of grains (2) followed by collective, successive and quasi-periodic movements, called 'precursors' (3) ending in an avalanche. This dynamic can depend on many parameters. In this thesis, we have studied, by optical and acoustic measurements, the response of the granular medium subjected to a slow inclination of its container. We determined the importance of choosing the power of the acoustic signal on our measurements. We observed the effect of the grain surface condition on the occurrence of precursors and the occurrence of the avalanche. We performed tilted cycles ranging from -θ to +θ ending in an avalanche. We have demonstrated the influence of the θ cycle angle on the precursors and the final avalanche angle. We have also studied granular media with moisture contents between 40 and 96%, by surface and lateral optical measurements. We have shown that the avalanche angles and the appearance of the first precursors depend on the grain size but also the humidity. This dependence is related to cohesive forces that are relatively higher at high humidity and that compensate for the force of gravity for small grains. Finally, we have shown the importance of a homogeneous diffusion of moisture in the environment on its behavior. The impact of grain wettability was also discussed
Ivagnes, Alexandre. "Valeur prédictive du récepteur NKp30 dans la réponse à l’imatinib mesylate des tumeurs stromales gastrointestinales et identification d’un nouveau mécanisme inhibiteur des cellules Natural Killer par la voie TNFα/TNFR2/BIRC3/TRAF1". Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS237/document.
Over the last 10 years, immunotherapy has been at the forefront of cancer therapy. Natural Killer (NK) cells are part of the innate immune system and have the unique ability to lyse tumor cells without any antigen specific priming. They have a key prognostic role in several hematological and solid cancers including gastrointestinal stromal tumors (GIST). A balance between activating and inhibitory receptors triggers NK cell activation. Natural cytotoxicity receptors (NCR) are among the most clinically relevant activating receptors and include NKp30, NKp44 and NKp46. NKp30 can be expressed in 3 different isoforms: NKp30a and NKp30b are both immunostimulatory, inducing interferon (IFN) γ and tumor necrosis factor (TNF) α secretion whereas NKp30c is immunosuppressive, producing interleukin 10 (IL-10). IFNγ is a potent activator of immune cells whereas IL-10 is an anti-inflammatory cytokine. TNFα was first described as a serum factor, inducing tumor necrosis but its role has since been broadened to homeostatic functions. Ample evidence suggests that anti-tumor functions of NK cells are tightly regulated and expand far beyond the simple killing of malignant cells. Despite the tremendous progress in understanding NK cell biology, further work is warranted to fully exploit the anticancer potential of these cells.Our group demonstrated the crucial role that NK cells have in GIST. Indeed, NK cell infiltrate positively correlates with progression-free survival. Moreover, we showed that the preferential expression of the immunosuppressive isoform NKp30c, negatively impacts the clinical outcome of GIST patients. To further extend these observations, we explored the influence of various NKp30 isoforms in GIST patients.Firstly, we revealed that a high ratio between the expression of NKp30b and NKp30c isoforms predicted a stronger imatinib mesylate (IM) response (a tyrosine kinase inhibitor, TKI – first line standard of care in GIST) and that tumor cytokine milieu is modified following NKp30 isoform expression. Furthermore, we demonstrated a link between the presence of soluble ligands of NKp30, soluble B7 Homolog 6 (sB7-H6) and soluble BCL2 Associated Athanogene 6 (sBAG6), and a decrease in event-free survival in IM-treated GIST patients.Despite the presence of immune infiltration in many tumors, antitumor functions of lymphocytes are inhibited by the tumor microenvironment. Thus, we explored which signaling pathways were associated with NK cell inhibition in the tumor microenvironment. To do so, we performed a microarray from GIST infiltrating NK cells which highlighted the deleterious effect of TNFα/TNF Receptor 2/Baculoviral IAP Repeat Containing 3 (BIRC3)/TNF Receptor Associated Factor 1 (TRAF1) pathway on the function of NK cells. Next, we demonstrated that activation of this pathway in NK cells decreased gene transcription and protein expression of the activating receptor NKp46 (also called Natural Cytotoxicity Triggering Receptor 1 NCR1). This decrease positively correlated with NKp30c isoform expression. Moreover we showed that in mice, TNFα increases the metastatic dissemination of the NK sensitive tumor cell line, B16F10.Results from our research on NK cells strengthen the potential of NK cells as a therapeutic target for anti-tumor immunotherapy. Taken together, this thesis demonstrates the key role of the NKp30 receptor and its isoforms in the IM therapy as predictive marker in GIST response and describes for the first time a new NK cell inhibitory mechanism via the TNFα/TNFR2/BIRC3/TRAF1 pathway, paving the way for novel therapeutic strategies in cancer treatment
Fall, Ousmane. "L'érosion éolienne dans le bassin arachidier du Sénégal : déclenchement, mécanismes et réactions." Reims, 2002. http://www.theses.fr/2002REIML004.
Faillettaz, Jérôme. "Le déclenchement des avalanches de plaque de neige : de l'approche mécanique à l'approche statistique." Université Joseph Fourier (Grenoble), 2003. http://www.theses.fr/2003GRE10104.
Rodriguez, Axel. "Étude des mécanismes de déclenchement des Bits Collés dans les SRAM et DRAM en Environnement Radiatif Spatial." Thesis, Montpellier, 2017. http://www.theses.fr/2017MONTS032/document.
CNES’s onboard experiment results on several satellites have demonstrated that on SRAM and SDRAM memories, a fraction of words suffers from unknown errors that increase the afflicted words’ rate of error by orders of magnitude compared to other words. CNES’s experts found that these errors were due to the space radiation environment (proton, electrons, heavy ions).The main goals of this Ph.D. thesis are to successfully recreate such errors at ground level using irradiation facilities and particle accelerators, to investigate their behavior and finally, to submit a physical mechanism for memory cell degradation under irradiation, both coherent with experimental data and data obtained from TCAD simulations
Durrieu, Françoise. "Réponse des cellules leucémiques au traitement par anthracyclines : étude du déclenchement de l'apoptose et de mécanismes de résistance." Bordeaux 2, 1998. http://www.theses.fr/1998BOR28571.
Carassou, Sébastien. "Déclenchement du clivage dans un acier faiblement allié : rôle de l'endommagement ductile localisé autour des inclusions." ENSMP, 1999. http://www.theses.fr/1999ENMP0935.
Valentin, Hélène. "Étude des mécanismes de déclenchement et de contrôle de l'activation des lymphocytes via les molécules CD2 et CD3 : impacts en immunothérapie." Compiègne, 1990. http://www.theses.fr/1990COMPD276.
Léal, Laetitia. "Étude des mécanismes de nucléation par action simultanée de l'ébullition et de la cavitation." Toulouse 3, 2012. http://thesesups.ups-tlse.fr/1928/.
Boiling is used in heat transfer enhancement techniques due to the high heat transfer coefficient which can be reached. However, the onset of boiling requires high wall temperatures. A technique to control the onset of nucleation is proposed. It consists in the dynamic deformation of a confinement wall which induces oscillations of the liquid pressure over time. This technique provides nucleation by simultaneous cavitation and boiling. The experimental device developed shows the efficiency of this technique: the temperature required for boiling incipience is greatly decreased. In addition, the physical mechanisms involved in this configuration differ from those predicted by existing theories of nucleation: some dynamic effects have a major effect on the conditions of nucleation. A theoretical study identified the physics governing the evolution of an embryo trapped in a cavity where it is subjected to a heat flux and where the liquid pressure oscillates. Furthermore, the effects of the dynamics and the hysteresis of the contact angle on nucleation incipience conditions have been approached from a theoretical point of view. It seems that these phenomena can be dominant mechanisms of nucleation by the simultaneous action of boiling and cavitation. Parallel to this study, a prototype of a compact heat exchanger incorporating the pumping function of the fluid has been designed
Lorteau, Mathieu. "Identification et analyse des mécanismes de génération du bruit de jet à partir de résultats expérimentaux et de simulations numériques." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066060/document.
This study falls within the field of aircraft noise reduction and more precisely jet noise as it represents the main noise source during take-off. The present work consists in the identification and the analysis of the jet noise source mecanisms using experimental results and numerical simulation. First, an analysis of the near field pressure of a hot subsonic turbulent jet has been done from experimental data acquired with an azimuthal array of microphones. Secondly, in order to continue the analysis, a numerical simulation using the LES approach with turbulence triggering reproducing the experimental configuration has been set up and validated. The data obtained from the simulation enable to link the highlighted behaviours in the near field to pressure waves developping in the shear layer and propagating toward the potential core end, through correlation calculations. The intermittency of the downstream acoustic radiation, i.e. the main direction of radiation, has been evidenced and related to the coherent structures developping in the shear layer. To deepen the analysis, it would be interesting for instance to calculate spectral coherence between the aerodynamic and the acoustic fields from synchronised measurements
Gunzburger, Yann. "Rôle de la thermique dans la prédisposition, la préparation et le déclenchement des mouvements de versants complexes : exemple des Rochers de Valabre (Alpes-Maritimes)." Vandoeuvre-les-Nancy, INPL, 2004. http://docnum.univ-lorraine.fr/public/INPL_T_2004_GUNZBURGER_Y.pdf.
The present dissertation describes a rockfall that has affected the Rochers de Valabres slope and discusses one possible mechanism for its occurrence, along with the potential for future ones. Ln the absence of an obvious explanatory trigger factor, we set out to examine whether natural daily surface temperature changes could have played a role in this event. Ln particular, it is suspected that these slight, yet repeated, perturbations may be a preparatory factor for rockfalls, with a day-to-day cumulative effect. A numerical model strengthens this hypothesis by showing that thermally-induced deformations can be sufficient to cause the graduai downward creep of rock blocks located in an awkward position. To investigate this notion more thoroughly, a currently-vulnerable part of the slope has been instrumented with a high-precision geodetic monitoring system to capture thermally-induced movements. Measured data are compared herein with numerical modelling results
Trichet, Yohan. "L'entrée dans la psychose : apparition ou déclenchement ? : la clinique de l'entrée dans la psychose, ses mécanismes, ses thérapeutiques et ses auto-traitements dans le champ de la psychopathologie." Phd thesis, Université Rennes 2, 2010. http://tel.archives-ouvertes.fr/tel-00458219.
Ochoa, Tejeda Veronica. "Étude des facteurs favorables au déclenchement des glissements de terrain dans les formations superficielles et les affleurements rocheux de la Sierra Norte de Puebla (Mexique)." Paris 7, 2010. http://www.theses.fr/2010PA070010.
In the years 1999 and the 2005 Sierra Norte de Puebla was affected by torrential rains caused by hurricanes of the Gulf of Mexico which involved the release of many landslides. In the zone of study there are a variety of geological formations which made it possible to define the existing relations between them and the landslides. The study of the factors which influence the development of mass movements and the nature of the material in which these events occur, allows us to develop a model showing the zones that present slope instability. For this reason all the studied lithologic formations (rocks, breccias and colluvions) have been studied in their geotectonic context and the structural geological features and the types of surface formations replaced in a 3-dimensional space. All these objective criteria have been used in order to define the factors that trigger mass movements according to the morphological characteristics of the landscape
Namjesnik, Dalija. "Origin of seismicity related to a flooded abandoned coal mining district at Gardanne, Provence, France." Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0116.
The closure of mines and post-mining management nowadays present a major challenge as the problems that arise can greatly concern public security. When mines are abandoned, groundwater pumping systems are usually stopped and the water which progressively fills the remaining voids can affect the mechanical stability of underground structures. In general, mechanisms of observed seismicity in flooded, post-mining districts have been poorly understood. As a case study, this thesis focused on the abandoned, flooded coal mine in Gardanne, France, which has been experiencing significant post-mining seismicity problems. Seismic activity in Gardanne mine seems to originate from an interaction between rocks and fluids, as spatio-temporal distribution of events suggests the link with intense rainfall events as well as the active pumping. The knowledge on the origin and the triggering mechanisms of the seismic activity in Gréasque and Regagnas sector is the key for seismic hazard assessment of the entire Gardanne basin. Thesis work focused on questions concerning precise identification of seismic source origin evaluating two hypothesis, determination of the mechanism behind the seismicity, link between seismicity and the hydrogeological system, as well as improving of the detection and location of microseismicity with a sparse network. The new developed detection and location methodology adapts the full waveform-based method BTBB by Poiata by overcoming the challenges of the sparse seismic monitoring network, and includes a novel approach for noise removal from continuous dataset as well as location quality-based classification system. The seismicity clustering behaviour was indicated by the new seismic catalogue 2014-2017, which was further analysed more thoroughly. All results are in favour of the origin of the seismic sources on the fault below the mine. Spatial and temporal characteristics of observed seismic events and multiplet and repeater occurrences provided a clearer image of the active geological structures and allowed a preliminary interpretation of possible mechanisms affecting the initiation and driving of the repeating or after-shock like behavior of seismic events, based on comparison with available hydrological data. Despite the general understanding of the mechanism behind the seismicity, the maximum magnitude of the events that can be triggered is at this moment is difficult to quantify and predict due to limitations of available data. As a prospective, in order to better understand the seismic hazard, more accurate observations of the seismicity, mechanical parameters and water level changes in the seismically active zone are required to improve the understanding and the interconnection between these factors
Delisle, Stéphane. "L'asservissement de la ventilation mécanique à l'aide du déclenchement diaphragmatique permet une meilleure synchronisation patient/ventilateur et une meilleure architecture du sommeil chez les patients en sevrage ventilatoire." Thèse, Université de Sherbrooke, 2012. http://hdl.handle.net/11143/6643.
El, Kafi Bahia. "Mécanismes de déclenchement et de maintien du sommeil mis en jeu au niveau du noyau raphe dorsalis par deux peptides à propriétés hypnogènes : le CLIP et le VIP : approches polygraphique, anatomique et voltamétrique chez le rat." Lyon 1, 1995. http://www.theses.fr/1995LYO1T163.
Ghira, Zinho Antunes Maria Francisca. "Un modèle et un mécanisme d'exécution pour les bases de données actives." Phd thesis, 1991. http://tel.archives-ouvertes.fr/tel-00009427.
Olqma, Ossama. "Critères de déclenchement du délestage de la neige collante de câbles aériens." Thèse, 2009. http://constellation.uqac.ca/141/1/030118650.pdf.
Faillettaz, Jerome. "Le déclenchement des avalanches de plaque de neige:De l'approche mécanique à l'approche statistique." Phd thesis, 2003. http://tel.archives-ouvertes.fr/tel-00192355.
aux avalanches de plaques de neige.
La détermination expérimentale de la ténacité de la neige, qui caractérise sa résistance à la propagation d'une fissure, nous a donné des résultats originaux que nous interprétons en tenant compte de la structure particulière de ce matériau.
Une étude statistique basée sur les données de La Plagne et de Tignes nous a permis de montrer pour la première fois que les distributions des tailles d'avalanches sont invariantes d'échelle. Aucun modèle ne reproduisant correctement ces statistiques de terrain, nous avons créé un automate cellulaire à deux seuils, piloté en contrainte,
qui reproduit le comportement statistique des avalanches mais aussi celui d'autres aléas gravitaires naturels à l'aide du réglage d'un unique paramètre reflétant l'anisotropie de cohésion du matériau. Cette approche peut être considérée comme une alternative
à la Criticalité Auto Organisée pour les ruptures gravitaires.