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Dissertations / Theses on the topic 'Wave Transform'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Nazaikinskii, Vladimir, Bert-Wolfgang Schulze, and Boris Sternin. "Quantization and the wave packet transform." Universität Potsdam, 1999. http://opus.kobv.de/ubp/volltexte/2008/2544/.

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2

Kerber, Florian. "Dispersive Wave Analysis using the Chirplet Transform." Thesis, Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14116.

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Time-frequency representations (TFR) are a widely used tool to analyze signals of guided waves such as Lamb waves. As a consequence of the uncertainty principle, however, the resolution in time and frequency is limited for all existing TFR methods. Due to the multi-modal and dispersive character of Lamb waves, displacement or energy related quantities can only be allocated to individual modes when they are separated in the time-frequency plane. The chirplet transform has been introduced as a generalization of both the wavelet and Short-time Fourier transform. It offers additional degrees of f

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3

Navarro, Moisés M. "Ocean wave data analysis using Hilbert transform techniques." Thesis, Monterey, California. Naval Postgraduate School, 1996. http://hdl.handle.net/10945/32022.

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A novel technique to determine the phase velocity of long-wavelength shoaling waves is investigated. Operationally, the technique consists of three steps. First, using the Hilbert transform of a time series, the phase of the analytic signal is determined. Second, the correlations of the phases of analytic signals between two points in space are calculated and an average time of travel of the wave fronts is obtained. Third, if directional spectra are available or can be determined from time series of large array of buoys, the angular information can be used to determine the true time of travel.

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4

Navarro, Jaime. "The Continuous Wavelet Transform and the Wave Front Set." Thesis, University of North Texas, 1993. https://digital.library.unt.edu/ark:/67531/metadc277762/.

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In this paper I formulate an explicit wavelet transform that, applied to any distribution in S^1(R^2), yields a function on phase space whose high-frequency singularities coincide precisely with the wave front set of the distribution. This characterizes the wave front set of a distribution in terms of the singularities of its wavelet transform with respect to a suitably chosen basic wavelet.

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5

Chang, Jin. "SINGLE ENDED TRAVELING WAVE BASED FAULT LOCATION USING DISCRETE WAVELET TRANSFORM." UKnowledge, 2014. http://uknowledge.uky.edu/ece_etds/58.

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In power transmission systems, locating faults is an essential technology. When a fault occurs on a transmission line, it will affect the whole power system. To find the fault location accurately and promptly is required to ensure the power supply. In this paper, the study of traveling wave theory, fault location method, Karrenbauer transform, and Wavelet transform is presented. This thesis focuses on single ended fault location method. The signal processing technique and evaluation study are presented. The MATLAB SimPowerSystem is used to test and simulate fault scenarios for evaluation studi

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6

Fiadeiro, Paulo Torrao. "Wave-front reconstruction of optical disturbances using digital image processing." Thesis, Loughborough University, 1995. https://dspace.lboro.ac.uk/2134/32619.

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This thesis is concerned with the development of a practical digital image processing system for recording and subsequent reconstruction of the magnitude and phase of an optical wave-front arriving from a coherently illuminated object disturbance. Since the wave-fronts of concern are coherent, the magnitude and phase of such waves are generally independent functions in the sense that the knowledge of one is not sufficient to uniquely deduce the other. To uniquely reconstruct and characterize optical disturbances both the magnitude and phase are required. In general, all recording media respond

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7

Negro, Giuseppe. "Sharp estimates for linear and nonlinear wave equations via the Penrose transform." Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCD071.

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Nous appliquons la transformée de Penrose, qui est un outil basique de la physique relativiste, à des estimations optimales pour les équations des ondes linéaire et non linéaire. Nous infirmons une conjecture de Foschi concernant les points extrémaux de l’inégalité de Strichartz à données dans l’espace de Sobolev Ḣ½ x Ḣ⁻½ (Rᵈ) où d ⩾2 est pair. En revanche, nous donnons des indications appuyant cette conjecture en dimension impaire, ainsi qu’une version raffinée de son inégalité optimale sur R¹⁺³, en ajoutant un terme proportionnel à la distance des données initiales de l’ensemble des points e

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8

Fluty, Wesley. "FAULT LOCATION TECHNIQUES USING THE TRAVELING WAVE METHOD AND THE DISCRETE WAVELET TRANSFORM." UKnowledge, 2019. https://uknowledge.uky.edu/ece_etds/146.

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Fault location within electric power systems is an important topic that helps reduce outage duration and increases reliability of the system. This paper explores the topic of fault location using traveling waves generated by fault conditions and the discrete wavelet transform used for time-frequency analysis. The single-ended and double-ended traveling wave methods are presented and evaluated on a single circuit and double circuit 500kV system modeled using MATLAB SIMULINK. Results are compared on the basis of wavelet used for analysis, sampling rate, and fault resistance.

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9

Fateri, Sina. "Advanced signal processing techniques for multimodal ultrasonic guided wave response." Thesis, Brunel University, 2015. http://bura.brunel.ac.uk/handle/2438/11657.

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Ultrasonic technology is commonly used in the eld of Non-Destructive Testing (NDT) of metal structures such as steel, aluminium, etc. Compared to ultrasonic bulk waves that travel in infinite media with no boundary influence, Ultrasonic Guided Waves (UGWs) require a structural boundary for propagation such that they can be used to inspect and monitor long elements of a structure from a single position. The greatest challenges for any UGW system are the plethora of wave modes arising from the geometry of the structural element which propagate with a range of frequency dependent velocities and t

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10

Yu, Sihan. "Ocean Wave Simulation and Prediction." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/84992.

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WiFi can provide network coverage for users on land at anytime and anywhere, but on the sea, the wireless communication scenes change dramatically due to the signals are non-existence. Although some techniques (e.g. satellite, undersea fiber, microwave communication) have been used in marine communication, they are either too expensive with very small bandwidth, or too limited in its coverage range. We propose to develop a marine wireless mesh network which is formed by low cost buoyed wireless base stations to provide broadband connectivity for users on the sea. Ocean wave simulation and pred

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11

Harris, Matthew W. "Numerical realization of the generalized Carrier-Greenspan transform for the shallow water wave equations." Thesis, University of Alaska Fairbanks, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1598961.

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<p> Run-up of long waves in sloping U-shaped bays is studied analytically in the framework of the 1-D nonlinear shallow-water theory. By assuming that the wave flow is uniform along the cross-section, the 2-D nonlinear shallow-water equations are reduced to a linear semi-axis variable-coefficient 1-D wave equation via the generalized Carrier-Greenspan transformation (Rybkin et al., 2014). A spectral solution is developed by solving the linear semiaxis variable-coefficient 1-D equation via separation of variables and then applying the inverse Carrier-Greenspan transform. To compute the run-up o

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12

Lacko, Michal. "Potlačení síťového rušení v signálech EKG." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218657.

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This project includes survey of various methods ECG signal filtering, to suppress of powerline interference. It is specialized especially on properties which affecting the quality of filtration. The main essence of project is evaluation of the proposed methods in terms of quality and the least possible distortion of the resulting ECG signal. The work is focused on linear, adaptive filtering and filtering using discrete wavelet trans-form. Signal processing and evaluation of descriptive parameters are transferred using the graphical interface GUI in the program Matlab 7.7.0 ( R2008b ).

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Stockwell, Robert G. "S-transform analysis of gravity wave activity from a small scale network of airglow imagers." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0016/NQ42554.pdf.

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14

Huang, Shiwei 1962. "Preconditioned inexact spectral transform technique : a new method to solve the scalar Helmholtz wave equation." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=79234.

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Recently, Huang and Carrington introduced a preconditioned inexact spectral transform (PIST) method for calculating energy levels and wave functions in quantum mechanics. Mathematically, the PIST method is a new iterative technique for solving eigenvalue problems. It gives both eigenvalues and eigenfunctions within a prescribed eigenvalue spectrum. The method requires storing only a small number of vectors but allows one to calculate eigenvalues and wavefunctions with far fewer matrix-vector products than the conventional Lanczos method used for solving eigenvalue problems. We present h

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15

Richter, Jürgen. "Resolution of signal components of a resultant electromagnetic wave received in a multipath field of microwave frequencies." Thesis, University of South Wales, 1998. https://pure.southwales.ac.uk/en/studentthesis/resolution-of-signal-components-of-a-resultant-electromagnetic-wave-received-in-a-multipath-field-of-microwave-frequencies(b6dcd52b-f13f-47ff-9a6c-6008577728da).html.

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The growing use and demand for microwave communication systems has led to an increase in system density, particularly in urban areas. Consequently this rise has increased the risk of interference. Especially in urban areas the abundant presence of potential obstacles increase the risk of multipath propagation. Multipath propagation on radio links is associated with signal delays and signal level fades on which adversely influences the system performance. For efficient frequency planning the knowledge of the multipath geometries involved is required. This knowledge can be obtained by resolving

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16

Diery, Adrian. "Novel Applications of the Wavelet Transform for Analysis of P Waves in Clinical ECG Recordings." Thesis, Griffith University, 2009. http://hdl.handle.net/10072/367532.

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In recent years there has been renewed interest in the importance and analysis of the clinical P wave in the development of cardiovascular disease. Current research has focused upon P wave morphology and its diagnostic importance in the assessment of atrial disorders and cardiac conditions in general. The analysis of P waves in clinical electrocardiogram recordings presents several problems arising from the poor signal to noise ratio of the P wave. The variability of the P wave, its susceptibility to influences from anterior processes and physiological alterations in elderly patients all af

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17

Abbagoni, Baba Musa. "Experimental investigations of two-phase flow measurement using ultrasonic sensors." Thesis, Cranfield University, 2016. http://dspace.lib.cranfield.ac.uk/handle/1826/11832.

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This thesis presents the investigations conducted in the use of ultrasonic technology to measure two-phase flow in both horizontal and vertical pipe flows which is important for the petroleum industry. However, there are still key challenges to measure parameters of the multiphase flow accurately. Four methods of ultrasonic technologies were explored. The Hilbert-Huang transform (HHT) was first applied to the ultrasound signals of air-water flow on horizontal flow for measurement of the parameters of the two- phase slug flow. The use of the HHT technique is sensitive enough to detect the hydro

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18

Sen, Saffet Gokcen. "Investigation Of Electromagnetic Wave Propagation In Double Negative Materials." Phd thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609748/index.pdf.

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This thesis analyzes some aspects of electromagnetic wave propagation in double negative materials. Double negative materials have negative refractive indices. They are backward-wave materials. Plane waves undergo negative refraction at interfaces between double positive and double negative media. Causality principle implies these properties. High frequency plane wave scattering from a double negative infinitely long cylinder has been analyzed by using modified Watson transform, geometrical optics and Mie series. Mie series results and the modified Watson transform results have been found to b

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19

North, Jan Arthur. "Fourier image synthesis and slope spectrum analysis of deepwater, wind-wave scenes viewed at Brewster's angle /." Online version of thesis, 1989. http://hdl.handle.net/1850/11520.

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20

Zhang, Renyuan, and Siyang Cao. "3D Imaging Millimeter Wave Circular Synthetic Aperture Radar." MDPI AG, 2017. http://hdl.handle.net/10150/624963.

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In this paper, a new millimeter wave 3D imaging radar is proposed. The user just needs to move the radar along a circular track, and high resolution 3D imaging can be generated. The proposed radar uses the movement of itself to synthesize a large aperture in both the azimuth and elevation directions. It can utilize inverse Radon transform to resolve 3D imaging. To improve the sensing result, the compressed sensing approach is further investigated. The simulation and experimental result further illustrated the design. Because a single transceiver circuit is needed, a light, affordable and high

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21

Parker, Allen. "Exact periodic solutions of nonlinear wave equations : the bilinear transform, theta functions and a nonlinear superposition principle." Thesis, University of Newcastle Upon Tyne, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.331963.

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22

Herrmann, Felix J., Peyman P. Moghaddam, and Christiaan C. Stolk. "Just diagonalize: a curvelet-based approach to seismic amplitude recovery." European Association of Geoscientists & Engineers, 2007. http://hdl.handle.net/2429/523.

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23

Wang, Qiuhong. "Fault Location and Classification for Transmission Line Based on Wavelet Transform." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-187676.

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With the rapid development of power systems, locating and classifying faults is critical to the continuity and reliability of the transmission system. In this thesis, a traveling-wave based technique for fault location and classification on high voltage and extremely high-voltage transmission lines is proposed. The traveling-wave based protection has the advantage of fast response and not being affected by power swing and CTs saturation. In this thesis, the transient characteristics of single line to ground fault (which can be divided into solid fault and arcing fault) and lightning disturbanc

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24

Pipkins, Daniel Scott. "Non-linear analysis of (i) wave propagation using transform methods and (ii) plates and shells using integral equations." Diss., Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/20052.

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25

Vedantham, Vikram. "In-situ temperature and thickness characterization for silicon wafers undergoing thermal annealing." Thesis, Texas A&M University, 2003. http://hdl.handle.net/1969.1/1181.

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Nano scale processing of IC chips has become the prime production technique as the microelectronic industry aims towards scaling down product dimensions while increasing accuracy and performance. Accurate control of temperature and a good monitoring mechanism for thickness of the deposition layers during epitaxial growth are critical parameters influencing a good yield. The two-fold objective of this thesis is to establish the feasibility of an alternative to the current pyrometric and ellipsometric techniques to simultaneously measure temperature and thickness during wafer processing. TAP-

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26

Akangol, Mehmet. "Target Detection By The Ambiguity Function Technique And The Conventional Fourier Transform Technique In Frequency Coded Continuous Wave Radars." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606766/index.pdf.

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Continuous Wave (CW) radars are preferred for their low probability of intercept by the other receivers. Frequency modulation techniques, the linear frequency modulation (LFM) technique in particular, are commonly used in CW radars to resolve the range and the radial velocity of the detected targets. The conventional method for target detection in a linear FMCW radar makes use of a mixer followed by a low-pass filter whose output is Fourier transformed to get the range and velocity information. In this thesis, an alternative target detection technique based on the use of the Ambiguity Function

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27

Smith, John Matthew Smith. "The Schrodinger Equation of a Particle in a Time Dependent Electric Field: Case Studies." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1532045633954294.

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28

Ford, William Paul. "Development of a Fourier Transform Far Infrared (FTFIR) Spectrometer to Characterize Broadband Transmission Properties of Common Materials in the Terahertz Region." Wright State University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=wright1158508606.

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29

Tussing, Timothy Mark. "Analysis of Effects on Sound Using the Discrete Fourier Transform." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1338371732.

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30

Toušek, Vojtěch. "Detekce a rozměřování v signálu EKG." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217208.

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Automatic detection and delineation of ECG characteristic points is a basic procedure of any analyze of ECG using computer. This detection is a necessary step to simplify the work of cardiologists to evaluate long ECG records. In this thesis is proposed and evaluate a method of detection and delineation in a single-lead ECG using dyadic wavelet transform followed by correction in pseudo-orthogonal lead system taken from standard 12-lead system. The method uses information about position of positive maximum – negative minimum pair to detect ECG characteristic waves. At first the QRS complex is

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31

Zhou, Hang. "Modélisation de la propagation atmosphérique d'ondes électromagnétiques en 2D et 3D à partir de transformées de Fourier et en ondelettes." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30018/document.

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La propagation à longue distance est un problème majeur dans les télécommunications, la navigation et la surveillance. L'objectif de cette thèse est de développer une méthode rapide pour simuler la propagation des ondes dans une atmosphère en 2D et 3D. Dans ce travail, deux contributions principales vers cet objectif sont obtenues. Tout d'abord, des méthodes auto-cohérentes,c'est-à-dire basées sur une théorie discrète de l'électromagnétisme, sont développées en 2D et 3D. Ensuite, une méthode rapide 2D basée sur les ondelettes est proposée. Pour simuler la propagation d'ondes électromagnétiques

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32

Nguyen, Thi trang. "Contribution to peroidic homogenization of a spectral problem and of the wave equation." Thesis, Besançon, 2014. http://www.theses.fr/2014BESA2027/document.

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Dans cette thèse, nous présentons des résultats d’homogénéisation périodique d’un problème spectral et de l’équation d’ondes de Bloch. Il permet de modéliser les ondes à basse et haute fréquences. La partie modèle à basse fréquence est bien connu et n’est pas donc abordée dans ce travail. A contrario ; la partie à haute fréquence du modèle, qui représente des oscillations aux échelles microscopiques et macroscopiques, est un problème laissé ouvert. En particulier, les conditions aux limites de l’équation macroscopique à hautes fréquences établies dans [36] n’étaient pas connues avant le début

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33

Han, Junyu. "Fault location on mixed overhead line and cable network." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/fault-location-on-mixed-overhead-line-and-cable-network(1a911a42-ddfa-4592-8365-badc8d5c45f3).html.

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Society is increasingly concerned about the environmental impact of energy systems, and prefers to locate power lines underground. In future, certain socially/environmentally sensitive overhead transmission feeders will need to include underground cable sections. Fault location, especially when using travelling waves, become complicated when the combined transmission line includes a number of discontinuities, such as junction points, teed points and fault points. Consequently, a diverse range of fault locators were developed in this thesis, and the performance of the proposed fault locators in

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34

Popuzin, Vitaly. "Methods of fast Fourier transform in diffraction problems of elastic and acoustic waves with applications to crack mechanics." Doctoral thesis, Università di Catania, 2014. http://hdl.handle.net/10761/1548.

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The activity is connected with a development of modern fast computational methods applied to problems in wave dynamics, acoustics, and boundary-value problems of mechanics with mixed boundary conditions. This includes: 1) Development of fast methods for integral equations with convolution kernels arising in these fields of application. Such integral equations, after discretization, may be reduced to linear algebraic systems with matrix of Toepliz or circulant form. For both the types there can be applied fast iteration methods founded on Conjugate Gradient method with a preconditioning. Thi

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35

Madeiro, JoÃo Paulo do Vale. "DetecÃÃo e segmentaÃÃo automÃtica de batimentos cardÃacos do eletrocardiograma por modelagem matemÃtica e combinaÃÃo das transformadas Wavelet e de Hilbert." Universidade Federal do CearÃ, 2013. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=10281.

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nÃo hÃ<br>Sistemas automÃticos de auxÃlio ao diagnÃstico visam Ã extraÃÃo de mÃtricas especÃficas, podendo ser por algoritmos computacionais, de forma a subsidiar a anÃlise por parte do especialista de condiÃÃes orgÃnicas e fisiolÃgicas do paciente. No contexto da cardiologia, referidos sistemas sÃo particularmente importantes quando aplicados no processamento de sinais de longa duraÃÃo, como o eletrocardiograma (ECG) de 24 horas. As tÃcnicas para segmentaÃÃo e extraÃÃo automÃtica de parÃmetros do sinal ECG propostas nesta tese abrangem diversos campos de pesquisa. Inicialmente, o sistema real

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36

Mihálik, Ondrej. "Signály s omezeným spektrem, jejich vlastnosti a možnosti jejich extrapolace." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2019. http://www.nusl.cz/ntk/nusl-400958.

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The work is concerned with the band-limited signal extrapolation using truncated series of prolate spheroidal wave function. Our aim is to investigate the extent to which it is possible to extrapolate signal from its samples taken in a finite interval. It is often believed that this extrapolation method depends on computing definite integrals. We show an alternative approach by using the least squares method and we compare it with the methods of numerical integration. We also consider their performance in the presence of noise and the possibility of using these algorithms for real-time data pr

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37

Feng, Le. "An in-depth examination of two-dimensional Laplace inversion and application to three-dimensional holography." University of Dayton / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1406814392.

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Geldenhuis, Andre. "The Atmospheric Gravity Wave Transfer Function above Scott Base." Thesis, University of Canterbury. Physics and Astronomy, 2008. http://hdl.handle.net/10092/3698.

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Gravity waves have a significant dynamic effect in the mesosphere. In particular, they drive the mesospheric circulation and are the reason that the summer polar mesosphere is cooler than the winter polar mesosphere. This thesis examines whether the effects of gravity waves are largely determined by filtering effects which allow only gravity waves with certain properties to propagate into the atmosphere. The filtering of gravity waves above Scott Base, Antarctica is examined using a radiosonde derived gravity wave source function, an MF-radar derived mesospheric gravity wave climatology, and a

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Wu, Liming, and Kai Li. "Water Simulating in Computer Graphics." Thesis, Växjö University, School of Mathematics and Systems Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:vxu:diva-1581.

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<p>Fluid simulating is one of the most difficult problems in computer graphics. On the other hand, water appears in our life very frequently. This thesis focuses on water simulating. We have two main methods to do this in the thesis: the first is wave based water simulating; Sine wave summing based and Fast Fourier Transform based methods are all belong to this part. The other one is physics based water simulating. We make it based on Navier-Stokes Equation and it is the most realistic animation of water. It can deal with the boundary and spray which other method cannot express. Then we put ou

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Fritzell, Julius. "Sound propagation modelling with applications to wind turbines." Thesis, KTH, Mekanik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-260322.

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Wind power is a rapidly increasing resource of electrical power world-wide. With the increasing number of wind turbines installed one major concern is the noise they generate. Sometimes already built wind turbines have to be put down or down-regulated, when certain noise levels are exceeded, resulting in economical and environmental losses. Therefore, accurate sound propagation calculations would be beneficial already in a planning stage of a wind farm. A model that can account for varying wind speeds and complex terrains could therefore be of great importance when future wind farms are planne

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41

Owowo, Julius. "Simulation, measurement and detection of leakage and blockage in fluid pipeline systems." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/simulation-measurement-and-detection-of-leakage-and-blockage-in-fluid-pipeline-systems(f165fb02-a6fb-4063-a63d-3caa129c29f4).html.

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Leakage and blockage of oil and gas pipeline systems, water pipelines, pipe-work of process plants and other pipe networks can cause serious environmental, health and economic problems. There are a number of non-destructive testing (NDT) methods for detecting these defects in pipeline systems such as radiographic, ultrasonic, magnetic particle inspection, pressure transient and acoustic wave methods. In this study, the acoustic wave method and a modal frequency technique, which based on a roving mass method, are used. The aim of the thesis is to employ acoustic wave propagation based methods i

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42

Sun, Haili. "Ray-tracing internal wave/wave interactions and spectral energy transfer /." Thesis, Connect to this title online; UW restricted, 1997. http://hdl.handle.net/1773/10973.

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Turkboylari, Alpaslan. "Radar Propagation Modelling Using The Split Step Parabolic Equation Method." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/2/1260451/index.pdf.

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This document describes radar propagation modelling using split step parabolic wave equation (PWE) method. A computer program using Fourier split-step (FSS) marching technique is developed for predicting the electromagnetic wave propagation in troposphere. The program allows specification of frequency, polarization, antenna radiation pattern, antenna altitude, elevation angle and terrain profile. Both staircase terrain modelling and conformal mapping are used to model the irregular terrain. Mixed Fourier transform is used to implement the impedance boundary conditions. The conditions and the l

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Ozyazicioglu, Mehmet H. "A Boundary Element Formulation For Axi-symmetric Problems In Poro-elasticity." Phd thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/3/12607351/index.pdf.

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A formulation is proposed for the boundary element analysis of poro-elastic media with axi-symmetric geometry. The boundary integral equation is reduced to a set of line integral equations in the generating plane for each of the Fourier coefficients, through complex Fourier series expansion of boundary quantities in circumferential direction. The method is implemented into a computer program, where the fundamental solutions are integrated by Gaussian Quadrature along the generator, while Fast Fourier Transform algorithm is employed for integrations in circumferential direction. The strongly si

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Weir, Brad. "The transfer of momentum from waves to currents due to wave breaking." Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/195128.

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The research presented in this dissertation focuses on understanding the dynamics of waves and currents in the presence of wave breaking. The simplest approach, direct numerical simulation of the ocean dynamics, is computationally prohibitive--waves typically have periods of tens of seconds, while currents vary on times from hours to days. This work uses a multi-scale asymptotic theory for the waves and currents (Craik and Leibovich, 1976; McWilliams et al., 2004}, similar to Reynolds-averaged Navier-Stokes, in order to avoid resolving the wave field. The theory decomposes the total flow int

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Richter, Zdeněk. "Vícesvodová rozhodovací pravidla v rozměřování signálů EKG." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219529.

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This work deals with ECG signal measuring and methods of its processing. It compares some of the QRS detection methods and describes some of the testing databases. In this work a detector of QRS complex is realized, it is based on the approach of zero crossings. Next section makes combination of results from separate leads to one, which improves efficiency of detection. One section of this work deals with design and realization delination of ECG signal. In the last part outputs of this delineation are compared with the results of the other authors.

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Bajgar, Jiří. "Detekce P vlny v EKG signálech." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221317.

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The aim of this diploma thesis is to introduce methods of detection of the QRS complex and the subsequent detection of P waves. The intention is to create a program by specified method in the software Matlab which will be able to implement this method. The thesis describes the basic and important methods of detection and subsequent algorithm to detect P waves. Solution of the algorithm is tested on real data. It also describes the automatic signal evaluation and the results of this automatic function.

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Hurlebaus, Stefan. "Laser generation and detection techniques for developing transfer functions to characterize the effect of geometry on elastic wave propagation." Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/20742.

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Bylsma, Jason Michael. "Multidimensional Spectroscopy of Semiconductor Quantum Dots." Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4001.

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The coherent properties of semiconductor nanostructures are inherently difficult to measure and one-dimensional spectroscopies are often unable to separate inhomogeneous and homogeneous linewidths. We have refined and improved a method of performing multidimensional Fourier transform spectroscopy based on four-wave mixing (FWM) experiments in the box geometry. We have modified our system with broadband beamsplitters in all interferometer arms, high-resolution translation stages and the ability to work in reflection geometry. By improving the phase-stability of our setup and scanning pulse dela

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Moraes, Tiago Bueno de. "Precessão Livre no Estado Estacionário com alternância de fase para RMN em alta e baixa resolução." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-14102016-091634/.

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A aplicação de uma sequência de pulsos com tempo de repetição muito menor que os tempos de relaxação Tp << T2; T1, faz com que a magnetização atinja um estado estacionário descrito por H.Y. Carr como Estado Estacionário em Precessão Livre, Steady State Free Precession (SSFP). Nessa condição, o sinal é composto pela complexa sobreposição das componentes FID e eco. Sequências tipo SSFP são utilizadas na aquisição rápida de sinais, resultando em uma boa razão sinal ruído (s/r) em curto intervalo de tempo, porém introduzem fortes anomalias de fase e amplitude devido a complexa interação das compon

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