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Tesi sul tema "Propagation"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Braunstein, Alfredo. "Survey propagation." Doctoral thesis, SISSA, 2004. http://hdl.handle.net/20.500.11767/4250.

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2

Nechayev, Yuriy Ivanovich. "Investigations into propagation mechanisms for urban radiowave propagation modelling." Thesis, University of Birmingham, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.420512.

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3

Kubicek, Martin. "High dimensional uncertainty propagation for hypersonic flows and entry propagation." Thesis, University of Strathclyde, 2018. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=30780.

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Abstract (sommario):

To solve complex design problems, engineers cannot avoid to take into account the involved uncertainties. This is important for the analysis and design of hypersonic objects and vehicles, which have to operate in extreme conditions. In this work, two approaches for a high dimensional uncertainty quantification (UQ) are developed. The first approach performs a single-fidelity non-intrusive forward UQ, while the second one performs a multi fidelity UQ, as an extension of the first approach. Both methods are focused on real engineering problems and, therefore, appropriate heuristics are included

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4

Tu, Ronghui. "Generalized Survey Propagation." Thèse, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/19972.

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Survey propagation (SP) has recently been discovered as an efficient algorithm in solving classes of hard constraint-satisfaction problems (CSP). Powerful as it is, SP is still a heuristic algorithm, and further understanding its algorithmic nature, improving its effectiveness and extending its applicability are highly desirable. Prior to the work in this thesis, Maneva et al. introduced a Markov Random Field (MRF) formalism for k-SAT problems, on which SP may be viewed as a special case of the well-known belief propagation (BP) algorithm. This result had sometimes been interpreted to an unde

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5

Muirhead, Matthew. "Interior wave propagation." Thesis, University of Nottingham, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289312.

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6

Mikulica, Tomáš. "Light Propagation Volumes." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2015. http://www.nusl.cz/ntk/nusl-234902.

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This thesis deals with problem of computation of global illumination in real-time. Two methods are described. Namely Reflective Shadow Maps and Light Propagation Volumes. The first of them deals with the problem by using extended Shadow Mapping algorithm. The second one uses scene embedded into a 3D grid together with Spherical harmonics to compute light propagation in the scene. Furthermore this thesis contains results of measurement of the rendering speed of the Light Propagation Volumes algorithm with various settings on several machines. Quality of the resulting output of the algorithm is

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7

Růžička, Tomáš. "Light Propagation Volumes." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2016. http://www.nusl.cz/ntk/nusl-255483.

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The aim of master thesis is to describe different calculation of global illumination methods including Light Propagation Volumes. All three steps of LPV calculation are widely described: injection, propagation and rendering. It is also proposed several custom extensions improving graphics quality of this method. Two parts of design and implementation are focused on scene description, rendering system, shadow rendering, implementation of LPV method and proposed extensions. As conclusion, measurement and several images of application are presented, followed by comparison in environment with diff

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8

Bertin, Michaël. "Propagation des incertitudes dans un modèle réduit de propagation des infrasons." Thesis, Cachan, Ecole normale supérieure, 2014. http://www.theses.fr/2014DENS0020/document.

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La perturbation d’un système peut donner lieu à de la propagation d’onde. Une façon classique d’appréhender ce phénomène est de rechercher les modes propres de vibration du milieu. Mathématiquement, trouver ces modes consiste à rechercher les valeurs et fonctions propres de l’opérateur de propagation. Cependant, d’un point de vue numérique, l’opération peut s’avérer coûteuse car les matrices peuvent avoir de très grandes tailles. En outre, dans la plupart des applications, des incertitudes sont inévitablement associées à notre modèle. La question se pose alors de savoir s’il faut attribuer d’i

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9

Maxwell, Douglas Wayne. "Propagation of Camptotheca acuminata." [College Station, Tex. : Texas A&M University, 2004. http://hdl.handle.net/1969.1/454.

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10

Izquierdo, Fernández Benjamín. "Electromagnetic propagation in tunnels." Doctoral thesis, Universitat Politècnica de Catalunya, 2011. http://hdl.handle.net/10803/38437.

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Introduction of wireless communications systems in railway communications are at the origin of this thesis. Ifercat, the company in charge of the development of Línia 9 of Barcelona Metro, decided that wireless systems were employed in order to increase efficiency and safety. For this reason, characterisation of ISM 5.8GHz band in tunnel environments for broad band wireless train communications becomes necessary. Tunnel environments constitute harsh environments due to humidity, obstacles, power systems, moving trains, curves¿ The Automatic Train Control system requires a 20MHz bandwidth for t

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11

Calle, Juan Carlos. "Indoor propagation simulation software." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2000. http://handle.dtic.mil/100.2/ADA383980.

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Thesis (M.S. in Electrical Engineering) Naval Postgraduate School, Sept.ember 2000.<br>Thesis advisors, Lebaric, Jovan ; Adler, Richard. "September 2000." Includes bibliographical references (p. 45-46). Also available online.

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12

Saeed, Muhammad Azam. "Pulverised biomass flame propagation." Thesis, University of Leeds, 2016. http://etheses.whiterose.ac.uk/15264/.

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A resource analysis for Pakistan has demonstrated that abundant crop residues offer a viable, and environmental-friendly alternative to currently inadequate, oil-based power generation. Similarly, in many countries there is legislative pressure and incentives to replace coal with biomass, in electricity production. Efficient and safe exploitation of such biofuels requires data on flame propagation rates and explosibility characteristics. Crop residues (bagasse, rice husk, wheat-straw, corn-cob and peanut-shell) and different raw and thermally treated woods were tested using the modified Hartma

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13

Michaud, Denis 1970. "Neutrino propagation through matter." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=55513.

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In this thesis, we examine the evolution of a quantum system through background matter in order to determine the conditions of validity required for a description in terms of an effective Hamiltonian. General scattering rate equations are obtained for coherent diffuse scattering. We find, as expected, that the diffuse scattering rate is small compared to the coherent scattering rate in a medium with low fluctuations allowing an effective Hamiltonian description. However, for a more turbulent background, it is still possible to have more significant contributions to the diffuse scattering which

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14

Robinson, Anthony John. "Dynamic error propagation networks." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303145.

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15

Dorbec, Paul. "Jeux, graphes et propagation." Habilitation à diriger des recherches, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00975898.

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Ce manuscrit d'Habilitation à diriger des recherches décrit mes travaux de recherche récents en théorie des graphes et en théorie des jeux combinatoires. Une première partie est consacrée à l'étude de paramètres de graphes en s'intéressant particulièrement aux contraintes structurelles qui permettent d'améliorer les bornes connues. Dans cette partie, nous traitons notamment la paire-domination, la domination indépendante mais aussi les partitions en cographes et les colorations quasi propres. Une deuxième partie traite de la domination de puissance, une forme itérative de la domination au suje

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16

Soliman, Ehab Mohammed. "Delay hierarchy propagation model." Thesis, University of Plymouth, 2005. http://hdl.handle.net/10026.1/2334.

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Abstract (sommario):

Construction projects are always exposed to delay. Research has shown that most projects encounter delays and this problem is a global one. Previous research related to delays in construction projects have been dedicated to measuring and ranking the direct delays that have occurred. These types of delay are past delays and have already affected many aspects of the project's performance. This type of research is of the reactive type and handles delays after they have happened. The objective of this research is to model the construction project delays that can be used to predict the level of del

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17

Bixler, Reid Morris. "Sparse Matrix Belief Propagation." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/83228.

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We propose sparse-matrix belief propagation, which executes loopy belief propagation in Markov random fields by replacing indexing over graph neighborhoods with sparse-matrix operations. This abstraction allows for seamless integration with optimized sparse linear algebra libraries, including those that perform matrix and tensor operations on modern hardware such as graphical processing units (GPUs). The sparse-matrix abstraction allows the implementation of belief propagation in a high-level language (e.g., Python) that is also able to leverage the power of GPU parallelization. We demonstrate

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18

Berglund, Alexander, Fredrik Herbai, and Jonas Wedén. "Sound Propagation Through Walls." Thesis, Uppsala universitet, Avdelningen för beräkningsvetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-444632.

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Infrasound is undetectable by the human ear and excessive exposure may be a substantial health risk. Low frequency sound propagates through walls with minimal attenuation, making it difficult to avoid. This study interprets the results from both analytical calculations and simulations of pressure waves propagating through a wall in one dimension. The wall is thin compared to the wavelength; the model implements properties of three materials commonly used in walls. The results indicate that the geometry of the wall, most importantly the small ratio between wall width and wavelength, is the prim

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19

Le, Guilcher Arnaud. "Méthodes de propagation d'interfaces." Thesis, Paris Est, 2014. http://www.theses.fr/2014PEST1030/document.

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Ce travail porte sur la résolution de problèmes faisant intervenir des mouvements d'interfaces. Dans les différentes parties de cette thèse, on cherche à déterminer ces mouvements d'interfaces en résolvant des modèles approchés consistant en des équations ou des systèmes d'équations sur des champs. Les problèmes obtenus sont des équations paraboliques et des systèmes hyperboliques. Dans la première partie (chapitre 2), on étudie un modèle simplifié pour la propagation d'une onde de souffle en dynamique des fluides compressibles. Ce modèle peut s'écrire sous la forme d'un système hyperbolique,

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20

Ridgway, Douglas Thacher. "Fluctuation-controlled front propagation /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC IP addresses, 1997. http://wwwlib.umi.com/cr/ucsd/fullcit?p9820864.

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21

Savage, Brian Kirk Gurnis Michael. "Regional seismic wavefield propagation /." Diss., Pasadena, Calif. : California Institute of Technology, 2004. http://resolver.caltech.edu/CaltechETD:etd-05262004-100247.

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22

Price, M. A. "Sound propagation in woodland." Thesis, Open University, 1986. http://oro.open.ac.uk/56924/.

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A review of past research into sound propagation in woodland is presented. The attenuation of sound in woodland is small between about 800 and 2000Hz and greater at low and high frequencies. Attenuation measurements made in three contrasting woodlands are presented and compared with theoretical models. Propagation models using simple one- and two-parameter impedance models are used to calculate appropriate ground parameters for the prediction of impedance of the woodland soils. The ground parameters varied on different days in a single stand due to differences in moisture content and compactio

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23

Becker, Saskia. "The Propagation-Separation Approach." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät II, 2014. http://dx.doi.org/10.18452/16960.

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Lokal parametrische Modelle werden häufig im Kontext der nichtparametrischen Schätzung verwendet. Bei einer punktweisen Schätzung der Zielfunktion können die parametrischen Umgebungen mithilfe von Gewichten beschrieben werden, die entweder von den Designpunkten oder (zusätzlich) von den Beobachtungen abhängen. Der Vergleich von verrauschten Beobachtungen in einzelnen Punkten leidet allerdings unter einem Mangel an Robustheit. Der Propagations-Separations-Ansatz von Polzehl und Spokoiny [2006] verwendet daher einen Multiskalen-Ansatz mit iterativ aktualisierten Gewichten. Wir präsentieren hier

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24

Schiavazzi, Daniele. "Redundant Multiresolution Uncertainty Propagation." Doctoral thesis, Università degli studi di Padova, 2013. http://hdl.handle.net/11577/3422585.

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Stochastic partial differential equations can be efficiently solved using collocation approaches combined with polynomial expansion in parameter space. Estimators based on these concepts show smaller variance than traditional or stratified Monte Carlo approaches under mild dimensionality. Research efforts in this context are focused on improving the efficiency of these methodologies for high dimensional problems (increasing number of input random variables) or for problems with discontinuous response in parameter space. In the present work, we use Compressive Sampling in order to minimize the

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25

Leissing, Thomas. "Nonlinear acoustic wave propagation in complex media : application to propagation over urban environments." Phd thesis, Université Paris-Est, 2009. http://tel.archives-ouvertes.fr/tel-00584398.

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Dans cette recherche, un modèle de propagation d'ondes de choc sur grandes distances sur un environnement urbain est construit et validé. L'approche consiste à utiliser l'Equation Parabolique Nonlinéaire (NPE) comme base. Ce modèle est ensuite étendu afin de prendre en compte d'autres effets relatifs à la propagation du son en milieu extérieur (surfaces non planes, couches poreuses, etc.). La NPE est résolue en utilisant la méthode des différences finies et donne des résultats en accord avec d'autres méthodes numériques. Ce modèle déterministe est ensuite utilisé comme base pour la constructio

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26

Mahmood, Attiya. "Impact of Antenna Mutual Coupling, Propagation, and Nonreciprocity on Propagation-Based Key Establishment." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/6831.

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Propagation-based key establishment is a physical layer method for generating encryption keys based on two radios observing a reciprocal propagation channel. This work explores the impact of mutual coupling when communicating nodes are equipped with multiple antennas, multipath richness in the propagation environment, and practical limitations caused by the nonreciprocal nature of RF circuits on key establishment. First, network theory is used to formulate a model of a realistic communication system which incorporates transmit sources and receive loads, impedance matching networks, low-noise a

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27

Leissing, Thomas. "Propagation d'ondes non linéaires en milieu complexe - Application à la propagation en environnement urbain." Phd thesis, Université Paris-Est, 2009. http://tel.archives-ouvertes.fr/tel-00455590.

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Abstract (sommario):

Dans cette recherche, un modèle de propagation d'ondes de choc sur grandes distances sur un environnement urbain est construit et validé. L'approche consiste à utiliser l'Equation Parabolique Nonlinéaire (NPE) comme base. Ce modèle est ensuite étendu afin de prendre en compte d'autres effets relatifs à la propagation du son en milieu extérieur (surfaces non planes, couches poreuses, etc.). La NPE est résolue en utilisant la méthode des différences finies et donne des résultats en accord avec d'autres méthodes numériques. Ce modèle déterministe est ensuite utilisé comme base pour la constructio

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28

Dessalermos, Spyridon. "Undersea acoustic propagation channel estimation." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Jun%5FDessalermos.pdf.

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Thesis (M.S. in Electrical Engineering and M.S. in Applied Physics)--Naval Postgraduate School, June 2005.<br>Thesis Advisor(s): Joseph Rice, Roberto Cristi. Includes bibliographical references (p. 117-119). Also available online.

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29

Zahn, Ralph. "Prion propagation and molecular chaperones." Zürich : Institut für Molekularbiologie und Biophysik, Eidgenössische Technische Hochschule Zürich, 2002. http://e-collection.ethbib.ethz.ch/show?type=habil&nr=4.

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30

Sander, Tavallaey Shiva. "Wave propagation in sandwich structure." Doctoral thesis, KTH, Vehicle Engineering, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3088.

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31

Lagerkvist, Mikael Zayenz. "Techniques for Efficient Constraint Propagation." Licentiate thesis, KTH, Electronic, Computer and Software Systems, ECS, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9511.

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<p>This thesis explores three new techniques for increasing the efficiency of constraint propagation: support for incremental propagation, improved representation of constraints, and abstractions to simplify propagation. Support for incremental propagation is added to a propagator centered propagation system by adding a new intermediate layer of abstraction, advisors, that capture the essential aspects of a variable centered system. Advisors are used to give propagators a detailed view of the dynamic changes between propagator runs. Advisors enable the implementation of optimal algorithms for

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32

Uddholm, Per. "Numerical Simulation of Flame Propagation." Thesis, Uppsala University, Department of Information Technology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-98325.

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<p>The effects of the temperature and length, of the preheat zone, on the deflagration to detonation transition are investigated through numerical simulation. The Navier-Stokes equations, with a reaction term, are solved in one dimension. The time integration is a one-dimensional adaptation of an existing two-dimensional finite volume method code. An iterative scheme, based on an overlap integral, is developed for the determination of the deflagration to detonation transition. The code is tested in a number of cases, where the analytical solution (to the Euler equations) is known. The location

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33

Karis, Klas, Deborah Merzan, and Jacob Wärnhjelm. "Electron Propagation in Periodic Potentials." Thesis, KTH, Teoretisk fysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-103467.

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In this bachelor thesis we study the propagation of electrons in crystals. The crystalline structure is modeled as a one dimensional periodic potential primarily composed of delta function potential barriers. We use two different models to describe how a particle behaves in such a periodic structure. The first model is the Kronig Penney model described by S. Gasiorowicz in [ 1]. The second model is described by Olsen and Vignale in the article "The Quantum mechanics of electric conduction in crystals" [ 3]. We show that there exists certain ranges of energy for which electron propagation can o

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34

Feng, Jiling. "Wave propagation in flexible tubes." Thesis, Brunel University, 2008. http://bura.brunel.ac.uk/handle/2438/5367.

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Wave dissipation was previously investigated intensively in the frequency domain, in which the dissipation of waves is described as attenuation of pressure pulse decay with respect to the frequency or harmonics. In this thesis, wave dissipation, including decay of pressure pulse, peak of wave intensity and wave energy, is investigated in the time domain using wave intensity analysis (WIA). Wave intensity analysis benefits to this research in several aspects including: 1) WIA allows for wave dissipation investigated in the time domain; 2) WIA does not make any assumptions about the tube's wall

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35

Yamout, Fadi. "Relevance Feedback Using Weight Propagation." Thesis, University of Sunderland, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485442.

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A new relevance feedback technique called Weight Propagation has been developed which provides greater retrieval effectiveness than previously described techniques. Documents judged relevant by the user propagate positive Weights to documents close by in vector similarity space, while documents judged not relevant propagate Negative Weights to such neighbouring documents. Variants of Weight Propagation are also described, namely WPI and WPR (inspired by Ide and Rocchio respectively), and WPY which is the main focus of this thesis, where only the maximum weight propagated to each document is co

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36

Wilson, Simon Trevor. "Applications of cyclic belief propagation." Thesis, University of Cambridge, 2000. https://www.repository.cam.ac.uk/handle/1810/251732.

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37

Qu, Yong. "Breeding and propagation of Meconopsis." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/24899.

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Six species of Meconopsis were investigated for self-fertility and cross compatibility in order to incorporate desirable characters from both parents. The six species used were: M. cambrica, M. villosa, M. quintuplinervia, M. betonicifolia, M. horridula, M. aculeata. Chromosome counts were made: M. cambrica, n=14; M. villosa, n=16; M. quintuplinervia, n= c.42; M. betonicifolia, n=40; M. horridula, n=28 and M. aculeata, n=28. Interspecific compatibility was correlated with differences in ploidy level between parents. All crosses made except M. cambrica x quintuplinervia set seeds. M. cambrica,

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38

Lu, Chun. "The error propagation in robots." Thesis, University of Ottawa (Canada), 1990. http://hdl.handle.net/10393/5871.

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The accuracy of a robot manipulator has been receiving scrutinity since the widespread acceptance of robot manipulators. The relationship between two consecutive joint coordinate frames of a robot manipulator can be completely defined by five link parameters; one is the joint variable and the other four are the geometric parameters. The basis for the open-loop manipulator control is often the relationship between the Cartesian coordinates of the end-effector and the joint coordinates; therefore, the accuracy of the Cartesian position and orientation of the end-effector with regard to the real

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39

Bourbon, Claire. "Propagation de la 2-birationalité." Thesis, Bordeaux 1, 2011. http://www.theses.fr/2011BOR14279/document.

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L’objet de cette thèse est l’étude de la propagation de la 2-birationalité pour les 2-extensions de corps de nombres. Le problème étudié se présente comme suit : étant donnés un corps 2-rationnel totalement réel K, une extension quadratique totalement imaginaire L de K, et une 2-extension totalement réelle de K de K, à quelles conditions la 2-birationalité du compositum L = KL se lit-elle sur L ? La thèse se structure en trois parties : l’étude du cas absolument quadratique d’abord, le cas relativement quadratique ensuite ; le cas général enfin. Le résultat principal de la thèse résout complèt

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40

Sander, Tavallaey Shiva. "Wave propagation in sandwich structures /." Stockholm, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3088.

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41

Mandehgar, Mahboubeh. "THz propagation in the Atmosphere." Thesis, Linnéuniversitetet, Institutionen för fysik och elektroteknik (IFE), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-25561.

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42

Meurer, Thomas. "Wave propagation in hysteretic media." Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/19090.

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43

Kamalarasa, Sanmugarasa. "Buckle propagation in submarine pipelines." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328779.

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44

Joia, Ivo Alexander. "Electromagnetic propagation through controlled turbulence." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319988.

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45

Hodgkins, Andrew D. "Crack propagation in nuclear graphite." Thesis, University of Manchester, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488486.

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46

McBurnie, Sarah E. "Sound propagation through bubbly liquids." Thesis, University of Oxford, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.531980.

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47

McKelvie, Marion Lindsay. "Ultrasonic propagation in cancellous bone." Thesis, University of Hull, 1988. http://hydra.hull.ac.uk/resources/hull:8397.

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Abstract (sommario):

The thesis covers two main areas of work. The first is detailed experimental work and the second is the evaluation of existing ultrasonic theories in attempt to apply them to the propagation in cancellous bone. The work is related to a new technique which uses ultrasonic attenuation to measure and predict osteoporosis, especially in the elderly population. The ultrasonic attenuation, the longitudinal ultrasonic velocity, the scattering effect and the attenuation as a function of frequency were measured on a range of cancellous bone samples, from healthy to severely osteoporotic, and also a few

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48

McBride, Hugh Joseph. "Wave propagation in elastic solids." Thesis, Monterey, California. Naval Postgraduate School, 1992. http://hdl.handle.net/10945/24107.

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49

Zhao, Xin. "Wave Propagation under Ice Covers." Thesis, Clarkson University, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3667183.

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Abstract (sommario):

<p> The operational ocean wave model needs a sea ice component to simulate the global ocean waves. Current ocean wave models treat ice covered regions crudely. The purpose of this thesis is to provide a unified continuum model for the wave ice interaction. Sea ice is constantly subject to environmental forcing. As a result, its physical appearance and mechanical properties vary dynamically. There are three existing classic wave ice interaction models: viscous layer, mass loading, and thin elastic plate models. Viscous layer models may be used to simulate grease ice, mass loading model is proba

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50

Ambrizzi, Tercio. "Rossby wave propagation and teleconnections." Thesis, University of Reading, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335893.

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