Literatura científica selecionada sobre o tema "Modulation spatio-temporelle"
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Artigos de revistas sobre o assunto "Modulation spatio-temporelle"
Farias, Edson. "CARNAVAL CARIOCA, A MATRIZ DO NEGÓCIO DO ÓCIO BRASILEIRO". Caderno CRH 16, n.º 38 (31 de agosto de 2006). http://dx.doi.org/10.9771/ccrh.v16i38.18620.
Texto completo da fonteTeses / dissertações sobre o assunto "Modulation spatio-temporelle"
Fromaget, Catherine. "Modulation spatio-temporelle d'une protéine jonctionnelle, la CX43, au cours de l'organogénèse du myocarde et dans les cellules épithéliales". Aix-Marseille 2, 1992. http://www.theses.fr/1992AIX22030.
Texto completo da fonteFant, Bruno. "Importance du contexte cellulaire et de la régulation spatio-temporelle de l'expression du facteur de transcription Otx2 dans la modulation de ses fonctions". Thesis, Nice, 2014. http://www.theses.fr/2014NICE4100/document.
Texto completo da fonteThe molecular mechanisms explaining several functions of the homeogene Otx2 during embryonic development are the focus of this work. In a first part the importance of the regulation of its expression in the regionalisation of the central nervous system is studied. At the end of gastrulation the posterior border of Otx2 expression will position the isthmic organizer responsible for the induction of the midbrain and hindbrain. A mouse model was developed where this border is replaced by an ubiquitous expression of the gene. Contrary to the predictions of the current model, the organizer then correctly arises, and is shifted anteriorly. A concentration threshold of Otx2 thus appears necessary to its regionalising function. In a second part the importance of the cellular context in Otx2 function in the adult retina is examined. Otx2 is expressed in both tissues of this organ, the neural retina and RPE. A ChIP-seq analysis performed on both tissues revealed that this homeogene occupies very different sets of binding sites, which suggests distinct functions of the transcription factor. Most Otx2-bound sites in the neural retina were also bound by its paralogue Crx, with which a functional redundancy may therefore exist. A new mouse line finally allowed the study of the complete Otx2 interactome in the neural retina; this analysis showed that Otx2 does not interact with other important transcription factors of this tissue, and that Crx may therefore be the main actor of the Otx family in neural retina function. It also led to the discovery of a series of previously unknown partners of Otx2, which could be associated to new functions of this homeogene
Phan, Huy Dinh-Thuy. "Retournement temporel : application aux réseaux mobiles". Thesis, Rennes, INSA, 2015. http://www.theses.fr/2015ISAR0026/document.
Texto completo da fonteThis thesis studies the time reversal technique to improve the energy efficiency of future mobile networks and reduce the cost of future mobile devices. Time reversal technique consists in using the time inverse of the propagation channel impulse response (between a transceiver and a receiver) as a prefilter. Such pre-filtered signal is received with a stronger power (this is spatial focusing) and with a strong main echo, relatively to secondary echoes (this is time compression). During a previous learning phase, the transceiver estimates the channel by measuring the pilot signal emitted by the receiver. Space-time focusing is obtained only at the condition that the propagation remains identical between the learning phase and the data transmission phase: this is the ‘channel reciprocity’ condition. Numerous works show that spatial focusing allows for the reduction of the required transmit power for a given target received power, on the one hand, and that time compression allow for the reduction of the required complexity at the receiver side to handle multiple echoes, on the other hand. However, studies on complexity reduction are limited to ultra wideband. Some works of this thesis (based on simulations and experimental measurements) show that, for bands which are more typical for future networks (a carrier frequency of 1GHz and a spectrum of 30 MHz to 100 MHz), thanks to time reversal, a simple receiver and a mono-carrier signal are sufficient to reach high data rates. Moreover, the channel reciprocity condition is not verified in two scenarios which are typical from mobile networks. Firstly, in most European mobile networks, the frequency division duplex mode is used. This mode implies that the transceiver and the receiver communicate on distinct carriers, and therefore through different propagation channels. Secondly, when considering a receiver on a moving connected vehicle, the transceiver and the receiver communicate one with each other at distinct instants, corresponding to distinct positions of the vehicles, and therefore through different propagation channels. Some works of this thesis propose solutions to obtain space-time focusing for these two scenarios. Finally, some works of this thesis explore the combination of time reversal with other recent signal processing techniques (spatial modulation, on the one hand, a new multi-carrier waveform, on the other hand), or new deployment scenarios (millimeter waves and large antenna arrays to interconnect the nodes of an ultra dense network) or new applications (guidance and navigation) which can be envisaged for future mobile networks
Cambournac, Cyril. "Instabilités spatiales en milieu de Kerr : réseaux de solitons spatiaux et brisure de symétrie des solitons multimodes dans un guide plan". Phd thesis, Université de Franche-Comté, 2003. http://tel.archives-ouvertes.fr/tel-00008017.
Texto completo da fonteWan, Sheng. "Nonreciprocal Acoustic Metamaterials based on Time-Varying Media". Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0230.
Texto completo da fonteNonreciprocal acoustic metamaterials are time-reversal-asymmetric devices in which the response field is different when the source and receiver are interchanged. Nonreciprocal acoustic metamaterials have significantly broadened the horizon of the whole acoustics field. As a novel category of nonreciprocal acoustic metamaterials, time-varying media are gaining research interest in recent years. In this doctoral project, we innovatively proposed several nonreciprocal devices based on time-varying media. First, a theoretical demonstration of acoustic nonreciprocity via cascaded time-modulated Fabry-Perot (FP) resonator system is introduced. Second, an experimental demonstrated of elastic flexural wave nonreciprocity via cascaded time-modulated spring-mass resonator (SMR) system is introduced, based on electromagnetic coupling. Last, we provide a new approach using air flow to bring in nonreciprocal multifunctional meta-lens. We split a sound waveguide into multiple channels, and directionally manipulate the phases of each channel to achieve unidirectional focusing and sound beam. This thesis provides new paradigms of nonreciprocal acoustic metamaterials, which would contribute to new possibilities of wave manipulation
Basley, Jérémy. "Étude Expérimentale des Ondes et Structures Cohérentes dans un Écoulement Tridimensionnel de Cavité Ouverte". Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00822898.
Texto completo da fonteBasley, Jérémy. "An Experimental Investigation on Waves and Coherent Structures in a Three-Dimensional Open Cavity Flow". Thesis, Paris 11, 2012. http://www.theses.fr/2012PA112245/document.
Texto completo da fonteA space-time study of a three-dimensional nonlinearly saturated open cavity flow is undertaken using time-resolved space-extended experimental data, acquired in both cross-stream and spanwise planes, in incompressible air and water flows. Through use of multiple modal decompositions in time and space, the waves and coherent structures composing the dynamics in the permanent regime are identified and characterised with respect to the instabilities arising in the flow.Effects of nonlinearities are thoroughly investigated in the impinging shear layer, regarding the self-sustained oscillations and their interactions with the inner-flow. In particular, the analysis conducted throughout the parameter space enlightens a global connection between the selection of locked-on modes and the amplitude modulation at the impingement and the mode switching phenomenon. Furthermore, observations of low frequencies interacting drastically with the shear layer flapping motion underline the existence of intrinsic coherent three-dimensional dynamics inside the cavity in spite of the shear layer disturbances.Linear stability analyses have demonstrated that centrifugal instabilities are at play along the main recirculation. The present investigation of the dynamics after onset of the saturation reveals numerous space-time coherent structures, whose properties are quantified and classified with respect to the underlying instabilities: travelling or standing spanwise waves. Finally, some patterns exhibited by the saturated structures suggest that the nonlinear mechanisms governing the mutations of the flow after the linear regime could gain more insight in the frame of amplitude equations
Goyette, Guillaume. "Caractérisation moléculaire de la modulation spatio-temporelle des fonctions du phagosome". Thèse, 2009. http://hdl.handle.net/1866/3585.
Texto completo da fonteMacrophages are specialized cells of the immune system which mediate destruction and killing of invading micro-organisms. They do so by engulfing them by a process called phagocytosis. Microbes are then captured in an intracellular compartment, the phagosome, which gradually acquire molecules able to attack and degrade its cargo. Use of proteomics let us demonstrate the presence of flotillin-1 enriched microdomains (also called lipid rafts or membrane rafts) on the phagosomes. Our team demonstrated the crucial importance of these rafts in the phagocytosis process. Indeed, survival of L. donovani correlates with its presence in a ‘raftless’ phagosome while a mutated L. donovani without LPG is rapidly killed in a phagosome containing lipid rafts. To understand the membrane raft destabilisation mechanism mediated the LPG molecule, we induced phagocytosis of parasites devoid of LPG (LPG-) and compared it to the wild type parasite by microscopy. We first demonstrated that LPG alone is necessary to prevent normal maturation of the phagosome. Additionally, we discovered that the LPG molecule not only inhibits lipid rafts formation on the phagosome but also disorganise pre-existing lipid rafts. This effect of LPG is proportional to the number of repetitive sugar units (Gal( 1,4)-Man 1-PO4) which compose this molecule. Our work demonstrated for the first time an important role of the membrane rafts in the phagosome maturation. Moreover, our conclusions will give new interesting leads for clinical studies on leishmaniosis. The second goal of this work was to characterise them with proteomics and lipidomics tools. To do this, we undertook the systematic identification of proteins present on both subdomains of the phagosome (lipid rafts versus the rest of the phagosomal membrane). To achieve this, we purified phagosomes, from which we isolated lipid rafts by floating Triton X-100 insoluble membranes (DRMs for Detergent Insoluble Membranes). After that, we identified proteins by mass spectrometry.