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Дисертації з теми "Coherence technique"

Автор: Grafiati
Опубліковано: 21 грудня 2024

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1

Chau, Alexandra H. (Alexandra Hung) 1980. "Elastography using optical coherence tomography : development and validation of a novel technique." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/91380.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2004.<br>Includes bibliographical references (p. 161-167).<br>Atherosclerosis is an inflammatory disease characterized by an accumulation of lipid and fibrous tissue in the arterial wall. Postmortem studies have characterized rupture-prone atherosclerotic plaques by the presence of a large lipid-rich core covered by a thin fibrous cap. Studies employing finite element analysis (FEA) based on ex vivo plaque geometry have found that most plaques rupture at sites of high circumferential stress, thus diagnosis o
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2

Kinnunen, M. (Matti). "Comparison of optical coherence tomography, the pulsed photoacoustic technique, and the time-of-flight technique in glucose measurements in vitro." Doctoral thesis, University of Oulu, 2006. http://urn.fi/urn:isbn:9514281462.

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Abstract The development of a non-invasive glucose monitoring technique is very important because it would tremendously diminish the need to puncture the skin when taking blood samples and help diabetic patients in controlling their blood glucose levels and in treating Diabetes Mellitus. The focus of this thesis is on measuring the effect of glucose on the light scattering properties of a tissue-simulating phantom and biological tissues in vitro. Optical coherence tomography (OCT), the pulsed photoacoustic (PA) technique, and the time-of-flight (TOF) technique are used in the measurements and
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3

Hollington, Barnaby Paul. "Chordal roots, Klangverwandtschaft, euphony and coherence : an approach to ostensibly 'atonal', 'non-tonal' or 'post-tonal' harmonic technique." Thesis, University of Sussex, 2018. http://sro.sussex.ac.uk/id/eprint/75394/.

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My harmonic approach is founded on two premises, pertaining especially to chordal spacing. First, that for each of the 4,096 possible sets of pitch-classes within equal temperament, without exception, certain spacing principles and techniques, if consistently applied, will generate clear, or relatively clear chordal roots. Typically, the resulting sonorities will possess more than one root – that is, be heard as polychords. Second, that one may control the level of inherent sensory dissonance of any given set of pitch-classes, presented as a chord, through register. These two factors combine t
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4

Pfeffer, Nathalie. "Connaissances expertes, propagation de contraintes et maintien de coherence pour l'aide a la conception. Application a la conception d'equipements electroniques de satellites : le systeme smack." Paris 11, 1992. http://www.theses.fr/1992PA112278.

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L'activite de conception donne naissance a tous les objets qui nous entourent: les voitures, les batiments, les ordinateurs. . . Cette these vise l'automatisation du processus de conception preliminaire d'objets industriels (artefacts). Le modele computationnel de conception par assemblage que nous avons elabore s'execute en trois phases. La premiere analyse l'ensemble des specifications pour y detecter les points delicats et completer les valeurs manquantes. La seconde phase applique un modele de decomposition/combinaison pour construire un artefact de performances proches des specifications.
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5

Gerges, Awad Samir. "Novel fibre-optic-based interferometric sensors exploiting coherent and low-coherence signal processing techniques." Thesis, University of Kent, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236854.

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6

Wu, Jigang Yang Changhuei Yang Changhuei. "Coherence domain optical imaging techniques /." Diss., Pasadena, Calif. : Caltech, 2009. http://resolver.caltech.edu/CaltechETD:etd-12112008-102138.

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7

Albezzawy, Muhammad Nabil Mustafa. "Advanced signal processing methods for source identification using references." Electronic Thesis or Diss., Lyon, INSA, 2024. http://www.theses.fr/2024ISAL0074.

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Les techniques de référence à rang réduit sont couramment employées pour résoudre les problèmes d’extraction de source et de resynchronisation de champs physiques, lorsque le nombre de références dépasse celui des sources incohérentes. Dans ce cas, la matrice croisée-spectrale devient mal conditionnée, rendant la solution des moindres carrés invalide. Bien que la décomposition en valeurs singulières tronquée (DVST) soit utilisée pour résoudre ce problème, elle n'est valable que pour un bruit scalaire sur les références. De plus, il est difficile de définir un seuil de troncature lorsque les va
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8

Zhu, Kai. "Coherent and non-coherent techniques for cooperative communications." Thesis, University of York, 2014. http://etheses.whiterose.ac.uk/6852/.

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Future wireless network may consist of a cluster of low-complexity battery-powered nodes or mobile stations (MS). Information is propagated from one location in the network to another by cooperation and relaying. Due to the channel fading or node failure, one or more relaying links could become unreliable during multiple-hop relaying. Inspired by conventional multiple-input multiple-output (MIMO) techniques exploiting multiple co-located transmit antennas to introduce temporal and spatial diversity, the error performance and robustness against channel fading of a multiple-hop cooperative netwo
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9

Dunsby, Christopher William. "Wide-field coherence-gated imaging techniques including photorefractive holography." Thesis, Imperial College London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.407465.

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10

Méteau, Jérémy. "Instrumentation optique pour la caractérisation des tissus : analyse de la complémentarité et des limites techniques de fluorescence hyperspectrale et de Tomographie Optique Cohérente en vue de leur intégration multimodale." Thesis, Besançon, 2014. http://www.theses.fr/2014BESA2041/document.

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L'objectif de ce travail de recherche est le développement d'un système fibré d'imagerie point par point d'auto fluorescence multi-excitation, de tissus biologiques en utilisant la technique de fluorescence hyperspectrale et l'étude d'un système de tomographie optique cohérente comme possible modalité supplémentaire. La première partie de ce rapport présente les propriétés optique des tissus biologiques et les fluorophores pertinents pour la détection de tumeurs cancéreuses. La deuxième partie présente l'instrumentation du système d'imagerie de fluorescence et l'analyse hyperspectrale des résu
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11

Rodriguez, Solimar Reyes. "Optical coherence tomography and microwave imaging diagnostic techniques for osteoporosis /." Diss., Connect to online resource - MSU authorized users, 2008.

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12

Fatadin, M. I. A. "DSP techniques for optical coherent receivers." Thesis, University College London (University of London), 2011. http://discovery.ucl.ac.uk/1306182/.

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The design of modern optical communication systems seeks a solution to the optimisation of bandwidth utilisation. Despite the inherent simplicity offered by intensity modulation direct detection (IM-DD), it is evident that this conventional binary scheme cannot fully explore in full the theoretical achievable capacity of optical systems. A lot of research activity is directing towards coherent detection techniques, already investigated in the early nineties, but then abandoned because of IM-DD cost efficiency and technological ease with erbium-doped fibre amplifiers. Coherent techniques requir
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13

Cuesta, Sáez Blas Antonio. "Efficient techniques to provide scalability for token-based cache coherence protocols." Doctoral thesis, Universitat Politècnica de València, 2009. http://hdl.handle.net/10251/6024.

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Cache coherence protocols based on tokens can provide low latency without relying on non-scalable interconnects thanks to the use of efficient requests that are unordered. However, when these unordered requests contend for the same memory block, they may cause protocols races. To resolve the races and ensure the completion of all the cache misses, token protocols use a starvation prevention mechanism that is inefficient and non-scalable in terms of required storage structures and generated traffic. Besides, token protocols use non-silent invalidations which increase the latency of write misses
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14

Holmes, R. D. "Coherent optical detection techniques in surface metrology." Thesis, University of Nottingham, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294698.

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15

Baines, Darwin Tarry. "Accelerated Ray Traced Animations Exploiting Temporal Coherence." Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd915.baines.

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16

Russell, Christopher David. "Study of interference effects and signal processing techniques in optical coherence tomography." Thesis, University of Liverpool, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.406628.

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17

Zhang, Hao, Robert Kuschmierz, and Jürgen Czarske. "3D interferometric shape measurement technique using coherent fiber bundles." SPIE, 2017. https://tud.qucosa.de/id/qucosa%3A34957.

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In-situ 3-D shape measurements with submicron shape uncertainty of fast rotating objects in a cutting lathe are expected, which can be achieved by simultaneous distance and velocity measurements. Conventional tactile methods, coordinate measurement machines, only support ex-situ measurements. Optical measurement techniques such as triangulation and conoscopic holography offer only the distance, so that the absolute diameter cannot be retrieved directly. In comparison, laser Doppler distance sensors (P-LDD sensor) enable simultaneous and in-situ distance and velocity measurements for monitoring
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18

Ribeiro, H. "Symmetry and proportion : how these issues guide, inform and add coherence to musical composition." Thesis, Canterbury Christ Church University, 2011. http://create.canterbury.ac.uk/10823/.

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The central subject of this thesis is the application of the concepts of symmetry and proportion in music and how these can be used to generate original compositions. Information about the musical application regarding concepts of symmetry and proportion both in the twentieth-century and earlier is provided. The first section also offers additional information about the construction of symmetrical harmony and its common usage; here too, principles of intervallic proportion are explained based on the compositional thinking of English composer Christopher Bochmann. The second section presents se
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19

Adler, Desmond Christopher 1978. "Digital signal processing techniques for optical coherence tomography : OCT and OCT image enhancement." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/28486.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2004.<br>Includes bibliographical references (p. 132-135).<br>Digital signal processing (DSP) techniques were developed to improve the flexibility, functionality, and image quality of ultrahigh resolution optical coherence tomography (OCT) systems. To reduce the dependence of OCT research systems on fixed analog electronics and to improve overall system flexibility, a digital demodulation scheme implemented entirely in software was developed. This improvement allowed rapid reconfiguratio
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20

Laurain, Alexandre. "Sources laser à semiconducteur à émission verticale de haute cohérence et de forte puissance dans le proche et le moyen infrarouge." Phd thesis, Université Montpellier II - Sciences et Techniques du Languedoc, 2010. http://tel.archives-ouvertes.fr/tel-00613743.

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Le développement de sources lasers monomodes et accordables constitue un enjeu important dans plusieurs domaines en fort développement telle que la métrologie, les senseurs optiques, la spectroscopie, le traitement optique de l'information ou la médecine. Dans cette thèse nous faisons le point sur les limites des technologies actuelles, puis nous montrons comment les surpasser à travers la conception et l'étude physique de lasers à semiconducteur de haute cohérence émettant dans l'infrarouge. Nous nous intéressons particulièrement aux VECSEL dans le but d'obtenir un fonctionnement monofréquenc
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21

Goldfarb, Gilad. "DIGITAL SIGNAL PROCESSING TECHNIQUES FOR COHERENT OPTICAL COMMUNICATION." Doctoral diss., University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2893.

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Coherent detection with subsequent digital signal processing (DSP) is developed, analyzed theoretically and numerically and experimentally demonstrated in various fiber‐optic transmission scenarios. The use of DSP in conjunction with coherent detection unleashes the benefits of coherent detection which rely on the preservation of full information of the incoming field. These benefits include high receiver sensitivity, the ability to achieve high spectral‐efficiency and the use of advanced modulation formats. With the immense advancements in DSP speeds, many of the problems hindering the use of
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22

Alwafi, Reem. "Development of optical coherence tomography endoscopy for gynaecological and gastrointestinal studies and peritoneal membrane imaging." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/development-of-optical-coherence-tomography-endoscopy-for-gynaecological-and-gastrointestinal-studies-and-peritoneal-membrane-imaging(8254ec5d-549d-413a-a048-7d773e28dc79).html.

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In the medical field, the detection and diagnosis of diseases continue to improve. Developments in diagnostic techniques have helped to improve treatment in the early stages and avoid many risks to patients. One relatively new diagnostic technique is optical coherence tomography (OCT), which is used in many medical applications to perform internal microstructure imaging of the human body at high resolution (typically 10 micro metre), at high speed and in real time. OCT is non-invasive and can be used as a contact or non-contact technique to obtain an image. In medicine, there are many applicat
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23

Meadway, Alexander. "Combinations of techniques for the advancement of scanning laser ophthalmology and optical coherence tomography." Thesis, University of Kent, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.653049.

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In this thesis methods of eye imaging are investigated, primarily optical coherence tomography (OCT) and scanning laser ophthalmology (SLO). These are two well established technologies. This thesis investigates the combination of techniques to improve resolution, sensitivity and the amount of information that can be extracted from a device. There are three systems presented in the thesis. The first generates on-axis and off axis confocal retinal images simultaneously by way of a drilled mirror. Off-axis imaging provides greater depth penetration, but at the cost of resolution. The second syste
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24

Gómez, Casco David. "Non-Coherent Acquisition Techniques for High-Sensitivity GNSS Receivers." Doctoral thesis, Universitat Autònoma de Barcelona, 2018. http://hdl.handle.net/10803/665404.

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Los sistemas de radionavegación por satélite (GNSSs) se han convertido en una herramienta indispensable de la vida diaria, ya que nos ofrecen la posibilidad de conocer de manera precisa nuestra ubicación en tiempo real y en entornos al aire libre. Desde la aparición de estos sistemas, han surgido una gran cantidad de exitosas aplicaciones de GNSS. Algunos ejemplos de estas aplicaciones son los siguientes: navegación para automóviles, rastreo de vuelos, seguimiento de actividad deportiva y juegos de realidad aumentada. Debido al éxito alcanzado por los sistemas de GNSS, un gran inter
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25

Molter, Daniel [Verfasser]. "Novel approaches in coherent terahertz measurement techniques / Daniel Molter." München : Verlag Dr. Hut, 2011. http://d-nb.info/1018982531/34.

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26

He, Qubao. "Coherent power combining on spacecraft via wavefront Multiplexing techniques." Thesis, California State University, Long Beach, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1527380.

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<p> A novel orthogonal wavefront (WF) Multiplexing (Muxing) and De-Multiplexing (Demuxing) scheme is proposed for uplink from antenna array elements to multiple spacecraft (S/C). By using an adaptive equalization at the receiver of S/C, the phase deviation due to different near field distances of the uplink from antenna array elements to S/C is compensated via the WF Demuxing method on S/C. This scheme allows power combining from antenna array elements to S/C. Besides, this scheme can be extended and applied to multiple S/C. Simulations verify that the proposed scheme achieves the same bit err
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27

Mann, Berenice Ann. "Novel coherent laser spectroscopic techniques for minor species combustion diagnostics." Thesis, University of Reading, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304258.

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28

Lee, Kyehun. "Coherent Mitigation of Radio Frequency Interference in 10-100 MHz." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/28929.

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This dissertation describes methods of mitigating radio frequency interference(RFI) in the frequency range 10-100 MHz, developing and evaluating coherent methods with which RFI is subtracted from the afflicted data, nominally resulting in no distortion of the underlying signals. This approach is of interest in weak signal applications such as radio astronomy, where the signal of interest may have interference-to-noise ratio much less than one, and so can be easily distorted by other methods. Environmental noise in this band is strong and non-white, so a realistic noise model is developed, with
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29

Ambarkutuk, Murat. "A Grid based Indoor Radiolocation Technique Based on Spatially Coherent Path Loss Model." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/80405.

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This thesis presents a grid-based indoor radiolocation technique based on a Spatially Coherent Path Loss Model (SCPL). SCPL is a path loss model which characterizes the radio wave propagation in an environment by solely using Received Signal Strength (RSS) fingerprints. The propagation of the radio waves is characterized by uniformly dividing the environment into grid cells, followed by the estimation of the propagation parameters for each grid cell individually. By using SCPL and RSS fingerprints acquired at an unknown location, the distance between an agent and all the access point in an ind
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30

Boone, Marc. "High-definition optical coherence tomography: Contribution to the non-invasive near infrared optical imaging techniques of the skin." Doctoral thesis, Universite Libre de Bruxelles, 2016. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/232235.

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Background. The development of non-invasive imaging techniques has been stimulated by the shortcomings of histopathology. Currently the only valid diagnostic technique in dermatology is skin biopsy which remains a painful, invasive intervention for the patient. Moreover, this approach is not always convenient for monitoring and follow-up of a skin disease. Optical imaging technologies could solve these shortcomings as they are fast, precise, repeatable and painless. There are four established non-invasive skin imaging techniques used in daily practice: dermoscopy, high-frequency ultrasound, re
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31

Ng, Wing Chau. "Digital signal processing algorithms in single-carrier optical coherent communications." Doctoral thesis, Université Laval, 2015. http://hdl.handle.net/20.500.11794/26102.

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Des systèmes de détection cohérente avec traitement numérique du signal (DSP) sont présentement déployés pour la transmission optique de longue portée. La modulation par déplacement de phase en quadrature à deux polarisations (DP-QPSK) est une forme de modulation appropriée pour la transmission optique sur de longues distances (1000 km ou plus). Une autre forme de modulation, le DP-16-QAM (modulation d’amplitude en quadrature) a été récemment utilisée pour les communications métropolitaines (entre 100 et 1000 km). L’extension de la distance maximum de transmission du DP-16-QAM est un domaine d
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32

Olsson, Andreas. "Target recognition by vibrometry with a coherent laser radar." Thesis, Linköping University, Department of Electrical Engineering, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1730.

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<p>Laser vibration sensing can be used to classify military targets by its unique vibration signature. A coherent laser radar receives the target´s rapidly oscillating surface vibrations and by using proper demodulation and Doppler technique, stationary, radially moving and even accelerating targets can be taken care of. </p><p>A frequency demodulation method developed at the former FOA, is for the first time validated against real data with turbulence, scattering, rain etc. The issue is to find a robust and reliable system for target recognition and its performance is therefore compared with
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33

Iqbal, Md Asif. "Advanced Raman amplification techniques for high capacity and broadband coherent optical transmission systems." Thesis, Aston University, 2018. http://publications.aston.ac.uk/37651/.

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This thesis presents a detailed study of different advanced Raman fibre laser (RFL) based amplification schemes and the development of novel broadband distributed and discrete Raman amplifiers in order to improve the transmission performance of modern high capacity, long-haul coherent optical systems. The numerical modelling of different Raman amplifier techniques including power distribution of signal, pump and noise components, RIN transfer from pump to signal, broadband gain optimization and so on have been described in details. The RIN and noise performances of RFL based distributed Raman
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34

Zhang, Bo. "Experimental Studies of Quantum Dynamics and Coherent Control in Homonuclear Alkali Diatomic Molecules." Doctoral thesis, KTH, Physics, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3420.

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<p>The main theme covered in this thesis is experimentalstudies of quantum dynamics and coherent control in homonuclearalkali diatomic molecules by ultrafast laser spectroscopy iththe implementation of pump-probe techniques.</p><p>A series of experiments have been performed on the Rb2molecules in a molecular beam as well as in a thermal oven. Thereal-time molecular quantum dynamics of the predissociatingelectronically excited D(3)<sup>1</sup>Πu state of Rb<sub>2</sub>, which couples to/intersects several otherneighbouring states, is investigated using wavepackets. Thepredissociation of the D s
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35

Tongning, Robert-christopher. "Ralentir le déphasage des états de superposition atomiques dans un cristal de Tm3+ : YAG." Phd thesis, Université Paris Sud - Paris XI, 2014. http://tel.archives-ouvertes.fr/tel-01011160.

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Ce travail se place dans le contexte des recherches sur les mémoires quantiques pour la lumière. L'information quantique est stockée dans un état de superposition atomique, dont la durée de vie détermine le temps maximum de stockage.On s'intéresse particulièrement aux matériaux capables de capturer la lumière par excitation résonnante d'une raie d'absorption, puis de conserver l'information quantique dans un état de superposition du fondamental électronique.Dans Tm3+:YAG, l'information est enregistrée dans un état de spin nucléaire. Cependant le champ magnétique qui lève la dégénérescence nucl
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36

Lau, Alan Pak Tao. "Signal processing techniques for coherent fiber-optic communication systems in presence of Kerr nonlinearity /." May be available electronically:, 2008. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.

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37

FRANCESCHINI, PAOLO. "NOVEL SCHEMES FOR ULTRAFAST MANIPULATION OF QUANTUM MATERIALS." Doctoral thesis, Università Cattolica del Sacro Cuore, 2022. http://hdl.handle.net/10280/111822.

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La possibilità di controllare le proprietà elettroniche on-demand su una scala di tempo ultraveloce rappresenta una delle sfide più intriganti verso la realizzazione di dispositivi fotonici ed elettronici di nuova generazione. Stimolata da questo, negli ultimi decenni la ricerca scientifica ha concentrato la propria attenzione su diverse piattaforme a stato solido. Tra tutte, nanostrutture dielettriche (e metamateriali) e materiali correlati si presentano come i più promettenti candidati per la realizzazione di dispositivi dotati di nuove funzionalità. Al di là delle caratteristiche specifiche
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38

Muhammad, Rashed D. B. "Assessment of new real-time in-situ optical coherence tomography instrumentation and techniques for diagnosing and monitoring oral and cutaneous lesions." Thesis, University College London (University of London), 2015. http://discovery.ucl.ac.uk/1471556/.

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Head and neck cancer is the sixth most common cancer worldwide, with 686,328 new cases per year. Most head and neck cancers are squamous cell carcinomas of the oral cavity and oropharynx, and are burdened by high mortality (50% at 5 years from diagnosis), notwithstanding recent progress in treatment methods. The vast majority of oro-pharyngeal cancers are late diagnosed, with significant adverse effects on cure, morbidity and prognosis. There is general consensus that earlier diagnosis contributes to better outcome measures. Current diagnostic standards consist of clinical examination and surg
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39

Fornieri, Antonio. "Coherent manipulation of electronic heat currents in superconducting quantum circuits." Doctoral thesis, Scuola Normale Superiore, 2017. http://hdl.handle.net/11384/85898.

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40

Hanna, Sherif Fayez. "Electronic resonance enhanced coherent anti-Stokes Raman scattering technique for detection of combustion species and biological molecules." Texas A&M University, 2005. http://hdl.handle.net/1969.1/4379.

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Анотація:
The application of electronic-resonance enhanced (ERE) coherent anti-Stokes Raman scattering (CARS) for the detection of nitric oxide (NO) and acetylene (C2H2) is experimentally demonstrated and the effects of various parameters on the ERE CARS signal investigated. In addition, the detection of dipicolinic acid (DPA) using “normal” CARS is demonstrated. For NO detection, the frequency difference between a visible Raman pump beam and Stokes beam is tuned to a vibrational Q-branch Raman resonance of the No molecule to create a Raman polarization in the medium. The second pump beam is t
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41

PLANTEY, JOSIANE. "Reseaux de capteurs a fibres optiques pour materiaux composites : analyse et developpement des techniques de reflectometrie frequentielle et de multiplexage de coherence." Nice, 1991. http://www.theses.fr/1991NICE4520.

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Dans le cadre du projet ostic, des experts et utilisateurs de materiaux composites ont exprime le besoin de doter les pieces fabriquees de capteurs susceptibles de les informer sur l'etat de contraintes et de temperature affectant celles-ci, lors des phases de cuisson et/ou d'utilisation. Les capteurs proposes sont des capteurs a fibres optiques dont le nombre lie a la finesse de la resolution spatiale requise (quelques centimetres), et par la-meme au nombre de points de mesure, a exige une mise en reseau de ceux-ci. Deux systemes ont ete, ici, presentes: pour le premier, la gestion du reseau
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42

Fickers, Jessica. "Modulation formats and digital signal processing for fiber-optic communications with coherent detection." Doctoral thesis, Universite Libre de Bruxelles, 2014. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209204.

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A débit de données élevé, typiquement supérieur à 10 Gsymboles/s, les lignes de<p>télécommunication optique à fibre monomode souffrent de façon accrue des distorsions<p>inhérentes à la fibre et à l’architecture de transmission. Nous pouvons classer les<p>effets de fibre en plusieurs catégories:<p>– Les effets linéaires. La dispersion chromatique est entraînée par la dépendance en<p>fréquence de l’indice de réfraction de la fibre. Il en résulte un élargissement des<p>bits optiques. La dispersion des modes de polarisation prend son origine dans<p>la biréfringence de la fibre. La modélisation de
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43

Parks, Daniel. "X-ray Scattering Techniques for Coherent Imaging in Reflection Geometry, Measurement of Mutual Intensity, and Symmetry Determination in Disordered Materials." Thesis, University of Oregon, 2013. http://hdl.handle.net/1794/13221.

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The advent of highly-coherent x-ray light sources, such as those now available world-wide in modern third-generation synchrotrons and increasingly available in free-electron lasers, is driving the need for improved analytical and experimental techniques which exploit the coherency of the generated light. As the light illuminating a sample approaches full coherence, a simple Fourier transform describes the diffraction pattern generated by the scattered light in the far field; because the Fourier transform of an object is unique, coherent scattering can directly probe local structure in the sca
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44

Fiege, Daniel Pascal [Verfasser]. "Development and application of multiple-quantum coherence techniques for in vivo sodium MRI at high and ultra-high field strengths / Daniel Pascal Fiege." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2014. http://d-nb.info/1052254756/34.

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45

Corradini, Marina. "Reconstruction of the earthquake rupture process through coherent teleseismic imaging and statistical modeling." Thesis, Université de Paris (2019-....), 2019. https://theses.md.univ-paris-diderot.fr/CORRADINI_Marina_va1.pdf.

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De nombreuses études ont tenté d’éclairer la complexité de la rupture sismique de grands séismes en utilisant des techniques d’imagerie cohérente telles que la back- projection (BP). Dans une étude récente, Fukahata et al. (2013) ont suggéré que, d’un point de vue théorique, l’image BP de la rupture sismique est liée au glissement ou à la vitesse de glissement sur la faille. Cependant, la relation quantitative entre les images BP et les propriétés physiques du processus de rupture reste encore peu connue. Cette thèse vise à clarifier comment les images BP du champ d’ondes rayonné peuvent être
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46

Zhao, Qing. "Advanced Synchronization Techniques for Continuous Phase Modulation." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10486.

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The objective of this research work is to develop reliable and power-efficient synchronization algorithms for continuous phase modulation (CPM). CPM is a bandwidth and power efficient signaling scheme suitable for wireless and mobile communications. Binary CPM schemes have been widely used in many commercial and military systems. CPM with multilevel symbol inputs, i.e., M-ary CPM, can achieve a higher data rate than binary CPM. However, the use of M-ary CPM has been limited due to receiver complexity and synchronization problems. In the last decade, serially concatenated CPM (SCCPM) has drawn
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47

Ingels, Alexandre. "Développement de techniques d’imageries pour le diagnostic et le pronostic des tumeurs du rein." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS451/document.

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Le but du projet est le développement de nouvelles techniques d’imagerie pour le diagnostic et le traitement du cancer du rein. Nous avons évalué différentes techniques comprenant la tomographie en cohérence optique et l’imagerie moléculaire. Nous avons évalué différents marqueurs potentiels pour l’imagerie moléculaire en étudiant l’expression de différents marqueurs dans le cancer du rein et leur association avec le pronostic de la maladie. Enfin, nous avons évalué deux techniques d’imagerie moléculaire sur des modèles précliniques : l’Imagerie par Résonnance Magnétique moléculaire et l’échog
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48

Barnhart, Samuel. "Design and Development of a Coherent Detection Rayleigh Doppler Lidar System for Use as an Alternative Velocimetry Technique in Wind Tunnels." University of Dayton / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1595276402371536.

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49

Alhumaidi, Mouhammad [Verfasser], Abdelhak M. [Akademischer Betreuer] Zoubir, and Harald [Akademischer Betreuer] Klingbeil. "Statistical Signal Processing Techniques for Coherent Transversal Beam Dynamics in Synchrotrons / Mouhammad Alhumaidi. Betreuer: Abdelhak M. Zoubir ; Harald Klingbeil." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2015. http://d-nb.info/1111112657/34.

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50

Parks, Daniel H. "X-ray scattering techniques for coherent imaging in reflection geometry, measurement of mutual intensity, and symmetry determination in disordered materials." Thesis, University of Oregon, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3589544.

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<p> The advent of highly-coherent x-ray light sources, such as those now available world-wide in modern third-generation synchrotrons and increasingly available in free-electron lasers, is driving the need for improved analytical and experimental techniques which exploit the coherency of the generated light. As the light illuminating a sample approaches full coherence, a simple Fourier transform describes the diffraction pattern generated by the scattered light in the far field; because the Fourier transform of an object is unique, coherent scattering can directly probe local structure in the
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