Littérature scientifique sur le sujet « Longueur de localisation »
Créez une référence correcte selon les styles APA, MLA, Chicago, Harvard et plusieurs autres
Consultez les listes thématiques d’articles de revues, de livres, de thèses, de rapports de conférences et d’autres sources académiques sur le sujet « Longueur de localisation ».
À côté de chaque source dans la liste de références il y a un bouton « Ajouter à la bibliographie ». Cliquez sur ce bouton, et nous générerons automatiquement la référence bibliographique pour la source choisie selon votre style de citation préféré : APA, MLA, Harvard, Vancouver, Chicago, etc.
Vous pouvez aussi télécharger le texte intégral de la publication scolaire au format pdf et consulter son résumé en ligne lorsque ces informations sont inclues dans les métadonnées.
Articles de revues sur le sujet "Longueur de localisation"
Rojo, Gabriel, Mathias Glaus, Robert Hausler, Valérie Laforest et Jacques Bourgois. « La gestion territoriale basée sur l’approche systémique de la gestion dynamique des déchets (GDD) ». Canadian Journal of Civil Engineering 38, no 3 (mars 2011) : 283–92. http://dx.doi.org/10.1139/l10-119.
Texte intégralGeoffroy, B., F. Bialota, J. P. Bossy, M. Ravallec, F. D'Amico et Dominique Cuisance. « Les chimiorécepteurs de l'aile chez Glossina pallidipes (Diptera : Glossinidae) et Stomoxys nigra (Diptera : Muscidae) ». Revue d’élevage et de médecine vétérinaire des pays tropicaux 49, no 2 (1 février 1996) : 141–48. http://dx.doi.org/10.19182/remvt.9532.
Texte intégralCollignon, Bernard. « Apports de la télédétection des puits pastoraux à la cartographie des eaux souterraines du Sahel ». Revue Française de Photogrammétrie et de Télédétection 223 (13 décembre 2021) : 189–99. http://dx.doi.org/10.52638/rfpt.2021.602.
Texte intégralBaccaïni, Brigitte. « Les navettes des périurbains d'Ile-de-France ». Population Vol. 52, no 2 (1 février 1997) : 327–64. http://dx.doi.org/10.3917/popu.p1997.52n2.0364.
Texte intégralKudi, A. C., A. O. Aganga, V. C. Ogbogu et J. U. Umoh. « Prévalence de Sarcocystis sp. chez les ovins et caprins au Nord-Nigeria ». Revue d’élevage et de médecine vétérinaire des pays tropicaux 44, no 1 (1 janvier 1991) : 59–60. http://dx.doi.org/10.19182/remvt.9217.
Texte intégralMwangomb, K. D. « Caracteristiques Phenotypiques des Populations de Cobaye Domestique (<i>Cavia porcellus</i>) du Sud-Est du Katanga en RD Congo ». Journal of the Cameroon Academy of Sciences 19, no 2 (3 août 2023) : 109–24. http://dx.doi.org/10.4314/jcas.v19i2.1.
Texte intégralEGGEN, A. « Cartographie fine d’un gène et clonage positionnel ». INRAE Productions Animales 13, HS (22 décembre 2000) : 133–36. http://dx.doi.org/10.20870/productions-animales.2000.13.hs.3824.
Texte intégralLamonde, Yvan. « Le membership d'une association du XIXe siècle. Le cas de l'Institut canadien de Longueuil (1857-1860) ». Les associations volontaires au XIXe siècle 16, no 2 (12 avril 2005) : 219–40. http://dx.doi.org/10.7202/055690ar.
Texte intégralDeshaies, Laurent. « La croisance des villes minières canadiennes, essai d’explication ». Cahiers de géographie du Québec 19, no 46 (12 avril 2005) : 61–86. http://dx.doi.org/10.7202/021248ar.
Texte intégralGilormini, Graziella, Hélène Bertrand, Asuka Desroches, Florence Hecmil, Cécile Domingues et Catherine Pages. « La prise en charge en pédopsychiatrie de liaison de l’enfant brûlé et de sa famille dans un service de chirurgie infantile : évaluation, prévention et accompagnement ». Enfances & ; Psy N° 100, no 2 (24 mai 2024) : 161–72. http://dx.doi.org/10.3917/ep.100.0161.
Texte intégralThèses sur le sujet "Longueur de localisation"
Zejli, Hasnae. « Détection et localisation par émission acoustique de fils rompus dans les ancrages des câbles d'ouvrage d'art ». Compiègne, 2007. http://www.theses.fr/2007COMP1669.
Texte intégralThe objective of this study is the development of a method based on acoustic emission (AB) for detection and localization of broken wires in the cables anchorages. The analysis of the behavior mechanical of a broken wire in a tented strand, anchored at its two ends and subjected to a dynamic bending contributed 10 understand the physical phenomenon detected by AB. The development of an analytical model allowed to determine the most favourable conditions of vibration for detection of broken wires. The control method used is based on the acoustic emissions of the cable under dynamic bending. The broken wire generates on acoustic emission due to friction by slip over its recovery length. However, the healthy wire starting from certain deviation amplitude, can slip and constitute an additional source of AB. These phenomena sources were identified thanks to the analysis methodology of the AB parameters. The work showed that the acoustic signature of interwire friction depends on the surface state, the number of vibration cycles and on the degree damage of the cable (a number of broken wires inside anchorage). The acoustic emission is a technique able to give a diagnosis on the degradation state of a cable inside its anchorage, at least in the laboratory conditions
Vervisch-Picois, Alexandre. « Etude de systèmes de positionnement en intérieur utilisant des mesures de phase du code ou de phase de la porteuse de signaux de navigation par satellites ». Phd thesis, Institut National des Télécommunications, 2010. http://tel.archives-ouvertes.fr/tel-00626177.
Texte intégralVervisch-Picois, Alexandre. « Etude de systèmes de positionnement en intérieur utilisant des mesures de phase du code ou de phase de la porteuse de signaux de navigation par satellites ». Electronic Thesis or Diss., Evry, Institut national des télécommunications, 2010. http://www.theses.fr/2010TELE0012.
Texte intégralThe thesis proposes the study of systems of local constellations for positioning indoors.In this context, it appears that indirect paths disturb the measurement of time delay between the transmitter antenna and receiver antenna. The Near-Far problem between signals, a CDMA interference phenomenon, is exacerbated because of the short distances and variations in received power. The thesis provides answers to these two issues.For indirect multipath we propose to use carrier phase measurements. It must then solve the problem of ambiguity on these measurements. A method without carrying out a differential technique is proposed: a tracking loop insensitive to indirect routes: the SMICL. For the Near-Far problem, we have developed three approaches. One approach uses sequences of maximum length and significantly reduces its influence. A second method, called the Double Transmission Technique (DTT), can completely remove the interference for a pair of transmitters when their respective Doppler are equal. We have studied the case where different Doppler and developed an improved version of the DTT, the DTT extended to the carrier, which eliminates the influence of the Doppler. We also showed that this may also be applied to a fixed transmitter in the presence of a constellation of satellites. A third method, called DTT maximum, again uses a maximum length sequence to extend the method to the case DTT in the presence of several transmitters
Le, Perchec Jérôme. « Localisations et exaltations de la lumière dans des structures métalliques sub-longueur d'onde ». Université Joseph Fourier (Grenoble), 2007. http://www.theses.fr/2007GRE10014.
Texte intégralThis thesis presents theoretical works based on a modal approach, about the optical properties of metallic surfaces with rectangular grooves whose dimensions are smaller than the wavelength of the incident light. These surfaces show reflection anomalies related to local enhancements of the electromagnetic field, due to, in particular, Fabry-Pérot like resonances inside the grooves. The problem of two near-field coupled sub-wavelength cavities is analysed. Hot spot phenomena occur, and we show how to control the localization of light at sub-wavelength scales. The results could find important applications: optical switching, quantitative light addressing, surface enhanced Raman scattering (SERS). . . We also study the localization effects due to structural disorder: breaking the symmetry of periodic arrangements, different lighting configurations may appear, very sensitive to the excitation frequency. Some theoretical predictions are evidenced experimentally. Finally, we deal with the case of very sub-wavelength lamellar gratings, in connection with the Abnormal Optical Absorption and the SERS effect observed for some rough metallic films. Giant enhancements of the electric field, calculated inside nano-cavities with the exact modal method, in the visible region, are explained by the excitation of surface plasmons-polaritons whose wave vectors are much larger than those of light
Ollivier, Benjamin. « Acoustique longue portée pour transmission et localisation de signaux ». Thesis, Télécom Bretagne, 2016. http://www.theses.fr/2016TELB0413/document.
Texte intégralThere is an increasing interest in underwater positioning system in industry (off-shore, military, and biology). In order to localize a receiver relative to a grid of transmitters, thanks to the knowledge of positions and transmission time, it needs to detect each signal and estimate the TOA (Time Of Arrival). Thus, a range between a transmitter and receiver can be deduced by estimation of TOA. When receiver knows three ranges at least, it can deduce its position by triangulation. This work takes into account signal detection, and waveform choice. Detection method, based on matched filter, needs to be robust face to propagation channel (transmission loss, multi-paths) and to the system (multi-users environment). Moreover, the detection structure, being a combination of binary hypothesis testing, must work in real time. In a CDMA context which requires to distinguish each transmitter, the FHSS (Frequency Hopped Spread Spectrum) modulation, allocating one code per user, is adapted. FHSS signals performance, depending of the number of frequency shifts N and the time-bandwidth product, are analyzed from detection criterion point of view. Moreover, detection method and adapted signal is tested in a shallow water environment.The research was supported by ALSEAMAR and DGA-MRIS scholarship
Kiorpelidis, Ioannis-Markos. « Wave phenomena in one-dimensional space or time varying media ». Electronic Thesis or Diss., Le Mans, 2023. https://cyberdoc-int.univ-lemans.fr/Theses/2023/2023LEMA1032.pdf.
Texte intégralThe interaction of waves with media possessing spatial or/and temporal fluctuations leads tointeresting phenomenology. Within this framework, in the present thesis four wave phenomena arestudied: two occurring in spatially-varying media and two in time-varying media. We begin byexploring wave scattering by a finite spatially-periodic setup that is subject to perturbation. Ourfocus is on perfect transmission resonances (PTRs) and we develop a method for preserving themunder asymmetric perturbations. The performed analysis reveals a pairwise connection betweenPTRs of a spatially-periodic scattering setup with mirror symmetric cells. In the same contextof spatially varying media, we compute the localization length of the topological edge modes thatare supported in a mechanical mass-spring chain possessing random fluctuations of its stiffnessparameters. In the presence of strong chiral disorder the localization length diverges, implying atopological phase transition that is induced purely by disorder. As a next step we consider thecase where the couplings of the mechanical mass-spring chain vary with time in a deterministicway. Then this time-varying system can serve as a platform for transferring a topological edgemode. Going beyond the adiabatic limit, we design a protocol for the time-varying couplingsthat results in a fast and robust transfer and even more leads to amplification of the transferrededge mode. To shed light into the phenomenon of amplification in a time-varying platform, weexplore the propagation of a wave in a medium with time-periodic refractive index and with wavedynamics governed by the Mathieu equation. The wave exhibits transient amplification due to thenon normal nature of the propagator matrix and we provide numerical evidence that the globalamplifying features are provided merely by the monodromy matrix
Rebour, Thierry. « Conjoncture longue et dynamique spatiale la theorie du "rachat" : valeur, mobilités et localisations ». Paris 1, 1996. http://books.openedition.org/psorbonne/36928.
Texte intégralThe very existence of urban areas comes from desequilibriums in long-term economic trends, caused by the "buying up of value". The shape of such areas, at different scales, varies with the type of desequilibrium that originally created them
Kaur, Namneet. « Transfert de temps à longue distance utilisant des liaisons à fibre optique et comparaison croisée avec des méthodes par satelliteires ». Thesis, Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLEO002/document.
Texte intégralTime and frequency references are widely distributed over communications and computer networks, for a variety of scientific and industrial applications. Driven by a demand for improved performance, a number of new methods for time and frequency transfer over optical fiber-based networks have been developed in recent years. In this thesis our objective is to develop a scalable network time and frequency transfer approach, providing multi-user dissemination, compatible with large telecommunication networks and competitive with GNSS-based time distribution. Therefore we are concerned with methods for use in packet-based networks, like the Network Time Protocol (NTP) and Precision Timing Protocol (PTP). We also concentrate on “unidirectional” links, where the forward and backward signals between network nodes propagate over separate fibers, not within the same fiber (“bidirectional” links).In particular we use a method called White Rabbit PTP (WR). This is a novel technology developed at CERN, based on PTP while using Synchronous Ethernet and other techniques to achieve high performance. It demonstrates sub-nanosecond time stability and synchronization of arrays of instruments over 10 km scale networks. We are particularly interested in extending this method for large scale distribution of references at regional or national level, over links of up to 1000 km.We first study extensively the default performances and limitations of White Rabbit network equipment, in particular the White Rabbit switch. We make various improvements to its operation: on the locking of the grandmaster switch to the external reference, thus improving its short-term stability by more than an order of magnitude; optimizing the locking bandwidth of the slave switch; and increasing the PTP messaging rate between master and slave switches.We then study medium and long-distance WR links. We construct a 100 km, unidirectional link using fiber spools in the laboratory. We discover that the short-term performance is limited by chromatic dispersion in the fiber, while the long-term performance is degraded by the influence of temperature variations on the fiber. To limit the effect of chromatic dispersion for long-haul links, we propose the use of a cascaded approach. We realise a national scale, cascaded, 500 km link, again utilizing fiber spools. We use Dense Wavelength Division Multiplexing methods to construct this link by mutliple passages through shorter spools. We achieve a frequency transfer stability of 2 × 10−12 at one second of integration time and 5 × 10−15 at one day, limited by thermal noise in the long term. We achieve a time stability of 5 ps at one second of integration time, decreasing to a minimum of 1.2 ps at 20 seconds and remaining below one nanosecond for longer averaging times. These performances are similar in the short term, and two orders of magnitude better in the long term, than good quality GPS receivers. We expect thermal fluctuations and therefore the effect of fiber thermal noise to be suppressed by a factor of approximately five for installations in the field.Finally we make preliminary investigations of time calibration of WR links. The main challenge here is to measure the optical length asymmetry between the two fibers used for signal transfer in the forward and backward directions. We demonstrate a fiber swapping technique, using a mid range, suburban White Rabbit link over dark fiber. We then describe and test a new variational method for calibration, involving a differential measurement method based on operating two WR links at different wavelengths over the same optical fiber link.In conclusion, we demonstrate high performance, long haul White Rabbit links for time and frequency dissemination to multiple users. With the level of frequency transfer performance achieved, White Rabbit PTP provides a competitive and scalable technique for comparing industrial atomic clocks at regional and national scales
Trambly, de Laissardière Guy. « Etude théorique de la structure électronique des matériaux quasicristallins ». Université Joseph Fourier (Grenoble), 1996. http://www.theses.fr/1996GRE10075.
Texte intégralWolf, Florian. « Multi-channel ranging system for the localization of wireless connected objects in low power wide aea networks : From modeling to field trials ». Thesis, Limoges, 2020. http://www.theses.fr/2020LIMO0017.
Texte intégralThe Internet of Things (IoT) is an enabler to new applications, such as smart metering and environmental monitoring, intended to address current and future societal and ecological challenges. Things, possibly mobile or in distant locations, require wireless connectivity for data collection and remote control. Low Power Wide Area (LPWA) networks provide city-scale long-range, narrowband radio transmissions respecting the energy constraints of battery-powered low-cost objects. Being capable to localize these objects will add value to their data, enables tracking applications and is therefore a demanded and recent research topic. Precise and accurate radio signal delay based positioning without integrating additional hardware but taking advantage of intrinsic wireless communication signals is appealing in terms of device complexity, cost and energy consumption. However, radio localization within LPWA networks is challenging due to narrowband transmissions, resulting in a lack of delay precision as well as due to radio propagation channels, which degrade the accuracy of location estimates. This work addresses both challenges by investigating a multi-channel ranging system for LPWA networks. Coherently combining multiple sequentially transmitted narrowband signals on different radio channels improves delay estimation precision and allows resolving multipath channels for refined positioning accuracy. This scheme, based on instantaneous narrowband signals, conserves the LPWA long-range feature and is hence compatible with LPWA networks. A detailed signal model considering hardware imperfections as well as the required protocol exchanges for time, frequency and phase synchronization is developed. Based on this model, the requirements on radio transceiver architectures regarding the necessary phase coherence for multi-channel ranging are discussed. Lower bounds on the ranging precision are derived for both, free-space and multipath propagation channels, illustrating the improved precision compared to narrowband single channel ranging. Numerical simulations of radio signals for the two-way multi-channel ranging protocol illustrate that the performance of developed range estimators attains the theoretical precision bound and pave the way towards implementation. A flexible Software Defined Radio (SDR) based demonstrator is implemented to validate simulation results. Field trials in real urban outdoor environments are in accordance with simulation results and prove how scalable multi-channel ranging, in combination with advanced signal processing methods, will be an enabler towards precise and accurate localization in LPWA networks
Chapitres de livres sur le sujet "Longueur de localisation"
RAJARAPU, Swapna Priya, Diane E. ULLMAN, Marilyne UZEST, Dorith ROTENBERG, Norma A. ORDAZ et Anna E. WHITFIELD. « Interactions plantes-virus-vecteurs ». Dans Virologie, 225–86. ISTE Group, 2022. http://dx.doi.org/10.51926/iste.9023.ch7.
Texte intégralActes de conférences sur le sujet "Longueur de localisation"
Sergheraert, J., S. Grenier, C. Mauprivez, B. Lefevre et S. Laurence. « Cystadénome papillaire d’une glande salivaire accessoire. A propos d’un cas ». Dans 66ème Congrès de la SFCO. Les Ulis, France : EDP Sciences, 2020. http://dx.doi.org/10.1051/sfco/20206602011.
Texte intégral