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Dissertations / Theses on the topic 'Low frequency electromagnetic waves'

Author: Grafiati

Published: 6 September 2023

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1

Liu, Zhongjian. "Investigation of low frequency electromagnetic waves for long-range lightning location." Thesis, University of Bath, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760951.

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Lightning is the strongest natural electromagnetic radiation source, emitting electromagnetic energy in the frequency range from ~4 Hz to ~300 MHz or more. The location of lightning is calculated based on the received electromagnetic waves. The received electromagnetic waves, or lightning sferics, propagate from the lightning radiation source to the receiver along the ground path and reflections by the ionosphere named sky waves. Particularly for a long-baseline (>400 km) lightning receiver array, the received electromagnetic waves are usually a mixture of the ground wave and sky waves, which

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2

Seguin, Sarah Ann. "Detection of low cost radio frequency receivers based on their unintended electromagnetic emissions and an active stimulation." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2009. http://scholarsmine.mst.edu/thesis/pdf/Seguin_09007dcc80708216.pdf.

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Thesis (Ph. D.)--Missouri University of Science and Technology, 2009.<br>Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed November 23, 2009) Includes bibliographical references.

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3

Umeda, Takayuki. "Generation of low-frequency electrostatic and electromagnetic waves as nonlinear consequences of beam–plasma interactions." American Institite of Physics, 2008. http://hdl.handle.net/2237/12028.

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4

Chen, Chi-Chih. "Design and applications of two low frequency guided wave electromagnetic measurement structures." The Ohio State University, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=osu1406708013.

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5

Pokkuluri, Kiran S. "Effect of Admixtures, Chlorides, and Moisture on Dielectric Properties of Portland Cement Concrete in the Low Microwave Frequency Range." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/37039.

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The use of electromagnetic waves as a nondestructive evaluation technique to evaluate Portland cement concrete (PCC) structures is based on the principle that a change in the structure, composition, or properties of PCC results in a change in its dielectric properties. The coaxial transmission line is one of the few devices that can measure the dielectric properties of PCC at a frequency range of 100-1000 MHz. A coaxial transmission line developed at Virginia Tech was used to study the effect of moisture, type of aggregate, water/cement ratio, curing period, admixture type (microsilica,

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6

Bittle, James R. "2017 Full Solar Eclipse| Observations and LWPC Modeling of Very Low Frequency Electromagnetic Wave Propagation." Thesis, University of Colorado at Denver, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10843376.

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<p> On August 21, 2017 a total solar eclipse occurred over the United States commencing on the west coast moving across to the east coast providing an opportunity to observe how the rapid day-night-day transition changed the ionosphere’s D-region electron density and how very low frequency (VLF) electromagnetic wave propagation was affected. To observe the solar obscurity effects, VLF receivers were deployed in two locations: one in the path of totality in Lakeside, Nebraska and another south of the totality path in Hugo, Colorado. The locations were chosen to achieve an orthogonal geome

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7

MAROUAN, YOUSSEF. "Etat de polarisation et caracteristiques de propagation moyennes d'emissions em naturelles dans un magnetoplasma froid : application aux donnees ebf du satellite aureol-3." Orléans, 1988. http://www.theses.fr/1988ORLE2040.

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Observation supposee effectuee en un point fixe de l'espace. Cette observation consiste en la mesure simultanee d'au moins trois composantes du champ electromagnetique. Discussion des estimateurs du degre de polarisation proposes par samson. Simulation numerique. Identification experimentale des modes d'une onde multiple en propagation dans ce magnetoplasma (ou deux modes peuvent coexister), obtenue a partir des caracteristiques de polarisation des ondes. Application aux emissions tres basse frequence observees par satellite aureol-3

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8

Suedan, Gibreel A. "High frequency beam diffraction by apertures and reflectors." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/27545.

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Most solutions for electromagnetic wave diffraction by obstacles and apertures assume plane wave incidence or omnidirectional local sources. Solutions to diffraction problems for local directive sources are needed. The complex source point representation of directive beams together with uniform solutions to high frequency diffraction problems is a powerful combination for this. Here the method is applied to beam diffraction by planar structures with edges, such as the half-plane, slit, strip, wedge and circular aperture. Previously used restrictions to very narrow beams and paraxial regions,

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9

Kipp, Robert. "Mixed potential integral equation solutions for layered media structures : high frequency interconnects and frequency selective surfaces /." Thesis, Connect to this title online; UW restricted, 1993. http://hdl.handle.net/1773/5974.

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10

Lachin, Anoosh. "Low frequency waves in the solar system." Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267713.

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11

Clausen, Lasse Boy Novock. "Ultra-low frequency waves in the magnetosphere." Thesis, University of Leicester, 2009. http://hdl.handle.net/2381/7533.

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Ultra-low frequency waves, i.e. pulsations between 0.1 and 1,000 mHz, are an inherent feature of space plasmas. These plasmas are largely collisionless and hence waves play an important role as an agent to transfer energy, mass and momentum. This work explores some of the wave's features in the Earth's magnetosphere using several different measurement techniques located in different regions. The first of the three case studies presented describes results from an experiment involving an ionospheric heating facility located on Svalbard. The SPace Exploration by Active Radar (SPEAR) facility peri

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12

Borderick, James David. "Ionospheric signatures of ultra low frequency waves." Thesis, University of Leicester, 2011. http://hdl.handle.net/2381/9170.

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Ultra Low Frequency (ULF) waves have been studied for many years and the observation and modelling of such phenomena reveals important information about the solar-terrestrial interaction. Being ubiquitous in the collisionless terrestrial space plasma environment, ULF waves represent important physical processes in the transfer of energy and momentum. This thesis comprises three distinct studies to observe, model and analyse ULF phenomena. The first two studies focus on ULF wave observations at high-latitudes in the terrestrial ionosphere using a collection of both space- and ground-based instr

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13

Fozard, John Andrew. "Diffraction and scattering of high frequency waves." Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.433239.

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This thesis examines certain aspects of diffraction and scattering of high frequency waves, utilising and extending upon the Geometrical Theory of Diffraction (GTD). The first problem considered is that of scattering of electromagnetic plane waves by a perfectly conducting thin body, of aspect ratio O(k^1/2), where k is the dimensionless wavenumber. The edges of such a body have a radius of curvature which is comparable to the wavelength of the incident field, which lies inbetween the sharp and blunt cases traditionally treated by the GTD. The local problem of scattering by such an edge is tha

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14

Li, Min. "Robust topological design of low frequency electromagnetic devices." Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=121229.

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This thesis presents an automated topological design system for low frequency electromagnetic devices, e.g. an interior permanent magnet motor. The automated design is carried out through a topological shape optimization process: first, the system employs a topological sensitivity analysis to examine the design domain and to determine the optimal topology (distribution of source and materials); second, the system uses a shape optimizer to further improve the design; these two steps are performed alternately until the optimality condition is satisfied. The robustness of a topology with respect

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15

Miseikis, Vaidotas. "The interaction of graphene with high-frequency acoustic and electromagnetic waves." Thesis, University of Leeds, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.595843.

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Devices were developed to explore the perturbation of graphene using high-frequency signals. Two kinds of effects were studied: the interaction of graphene with surface acoustic waves (SAWs) and the propagation of picosecond pulses. The coupling of graphene with SAWs was first studied using flip-chip devices, which employed an evanescent field extending across the gap between the chips. A later design directly integrated layers of graphene grown by chemical vapour deposition (CVD) on piezoelectric 5ubstrates, containing interdigital transducers (IDTs) for SAW generation and detection. Graphene

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16

Wilson, Robert John. "Ultra low frequency waves in the Jovian magnetosphere." Thesis, Imperial College London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251582.

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17

Apo, Daniel Jolomi. "Low Frequency Microscale Energy Harvesting." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/49773.

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The rapid advancement in complimentary metal-oxide-semiconductor (CMOS) electronics has led to a reduction in the sizes of wireless sensor networks (WSN) and a subsequent decrease in their power requirements. To meet these power requirements for long time of operation, energy harvesters have been developed at the micro scale which can convert vibration energy into electrical energy. Recent studies have shown that for mechanical-to-electrical conversion at the mm-scale (or micro scale), piezoelectric mechanism provides the best output power density at low frequencies as compared to the other po

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18

Davies, Jacob Owen. "Inspection of pipes using low frequency focused guided waves." Thesis, Imperial College London, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.503091.

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The aim of the work presented here is to develop a pipe inspection tool that is capable of detecting, locating and then sizing any defects that may be present in the pipe section under test. The work is primarily directed towards quantifying any improvements that can be made to the current screening system by using synthetically focused imaging algorithms. The algorithms are first tested for plate imaging using a linear array and then modified for use on cylindrical structures. The minimal modifications make use of similarities between the guided wave structure in plates and pipes. The pipe im

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19

Barnes, Timothy. "The generation of low-frequency water waves on beaches." Thesis, University of Bristol, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319128.

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20

Sen, Mumtaz Bilgin. "Channel estimation techniques for single and multiple transmit antenna orthogonal frequency division multiplexing (OFDM) systems." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Sep%5FSen.pdf.

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Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, September 2005.<br>Thesis Advisor(s): Roberto Cristi, Murali Tummala. Includes bibliographical references (p. 71-72). Also available online.

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21

Masumdar, Salim. "Vibration-based electromagnetic energy harvester for low-frequency road traffic." Thesis, California State University, Long Beach, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10638807.

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<p> In recent times, wireless sensor network (WSN) has played an important role for applications in the biomedical, commercial, and military fields. One of the applications is in intelligent transportation system (ITS), which uses sensors placed under the roads to detect vehicles. Progress in the field of Micro-Electro-Mechanical System (MEMS) has made it possible to make sensors that are small and easy to install, but operate on batteries which need to be replaced on a regular basis. For this reason, an alternative supply of power is necessary to run the sensors more effectively. </p><p> T

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22

Shepherd, Sebastian James. "The effects of extremely low frequency electromagnetic fields on insects." Thesis, University of Southampton, 2018. https://eprints.soton.ac.uk/422277/.

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Flying insect species are currently in decline, including many species that provide important pollination ecosystem services. Combined exposure to various environmental stressors are associated with insect declines, including land-use change, pesticide use and climate change, but the potential biological and environmental effects of extremely low frequency electromagnetic fields (ELF EMFs) are poorly understood. ELF EMFs are pervasive in the environment, and anthropogenic ELF EMF pollution has increased greatly in recent years. Despite this, little has been done to consider the potential envir

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23

Ma, Zuhui, and 馬祖輝. "Fast methods for low-frequency and static EM problems." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hdl.handle.net/10722/195987.

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Electromagnetic effects play an important role in many engineering problems. The fast and accurate numerical methods for electromagnetic analysis are highly desired in both the low-frequency analysis and the static analysis. In the first part of this thesis, a low-frequency stable domain decomposition method, the augmented equivalence principle algorithm (A-EPA) with augmented electric field integral equation (A-EFIE), is introduced for analyzing the electromagnetic problems at low frequencies. The A-EFIE is first employed as a inner current solver for the EPA algorithm so that it improves

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24

Trott, Keith Dennis. "A high frequency analysis of electromagnetic plane wave scattering by a fully illuminated perfectly conducting semi-infinite cone /." The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487323583622574.

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25

McChesney, Jon Mearns Bellan Paul Murray Bellan Paul Murray. "Observations of stochastic ion heating by low frequency drift waves /." Diss., Pasadena, Calif. : California Institute of Technology, 1989. http://resolver.caltech.edu/CaltechETD:etd-02092007-143250.

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26

Elsden, Tom. "Numerical modelling of ultra low frequency waves in Earth's magnetosphere." Thesis, University of St Andrews, 2016. http://hdl.handle.net/10023/15663.

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Ultra Low Frequency (ULF) waves are a ubiquitous feature of Earth's outer atmosphere, known as the magnetosphere, having been observed on the ground for almost two centuries, and in space over the last 50 years. These waves represent small oscillations in Earth's magnetic field, most often as a response to the external influence of the solar wind. They are important for the transfer of energy throughout the magnetosphere and for coupling different regions together. In this thesis, various features of these oscillations are considered. A detailed background on the history and previous study of

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27

Smit, Jacobus Petrus. "Theoretical development and implementation of algorithms for the inversion of frequency domain airborne electromagnetic data into a layered earth." Pretoria : [s.n.], 2005. http://upetd.up.ac.za/thesis/available/etd-02222007-142602.

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28

Toida, Mieko, Takashi Yoshiya, and Yukiharu Ohsawa. "Low-frequency electromagnetic fluctuations in thermal-equilibrium, multi-ion-species plasmas." American Institute of Physics, 2005. http://hdl.handle.net/2237/7057.

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29

Demanuele, Charmaine. "Analysis of very low frequency oscillations in electromagnetic brain signal recordings." Thesis, University of Southampton, 2010. https://eprints.soton.ac.uk/159351/.

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Spontaneous very low frequency oscillations (<0.5 Hz), previously regarded as physiological noise, have of late been increasingly analysed in neuroimaging studies. These slow oscillations, which occur within widely distributed neuroanatomical systems and are unrelated to cardiac and respiratory events, are thought to arise from variations in metabolic demands in the resting brain. However, they also persist during active goal-directed processing, where they predict inter-trial variability in evoked responses and may present a potential source of attention deficit during task performance. This

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30

Koyama, Shin. "Genotoxic effects of extremely low frequency electromagnetic fields and radiofrequency radiation." Kyoto University, 2007. http://hdl.handle.net/2433/136436.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(人間・環境学)<br>甲第13165号<br>人博第372号<br>新制||人||91(附属図書館)<br>18||D||173(吉田南総合図書館)<br>UT51-2007-H438<br>京都大学大学院人間・環境学研究科相関環境学<br>(主査)教授小松賢志, 助教授倉橋和義, 助教授三浦智行<br>学位規則第4条第1項該当

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31

Callegary, James Briggs. "Spatial sensitivity of low-induction-number frequency-domain electromagnetic-induction instruments." Diss., The University of Arizona, 2005. http://hdl.handle.net/10150/282901.

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Numerical simulations were used to study spatial averaging in low-induction-number frequency-domain electromagnetic induction (LIN FEM) instruments. Local ( LS) and cumulative (CS) sensitivity were used to analyze three different aspects of LIN FEM spatial sensitivity. LS is the variation in a measured property given a small change at a given location of the property of interest. CS contours are derived from LS and reveal the shape and the fraction of total instrument sensitivity enclosed within the contours. The first study re-evaluated the asymptotic approach to LIN FEM spatial sensitivity.

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32

Mason, Sammuel P. "Atmospheric effects on radio frequency (RF) wave propagation in a humid, near-surface environment." Monterey, California : Naval Postgraduate School, 2010. http://edocs.nps.edu/npspubs/scholarly/theses/2010/Mar/10Mar%5FMason.pdf.

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Thesis (M.S. in Meteorology)--Naval Postgraduate School, March 2010.<br>Thesis Advisor(s): Guest, Peter S. ; Goroch, Andreas K. "March 2010." Author(s) subject terms: Electromagnetic propagation, electromagnetic scattering, groundwave propagation, mathematical techniques, variance reduction. Includes bibliographical references (p. 67-68). Also available in print.

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33

Kochergov, Roman. "Wave equations for low frequency waves in hot magnetically confined plasmas." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=967545463.

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34

Dong, Chuanfei. "Heating of ions by low-frequency Alfven waves in solar atmosphere." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37160.

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The exact mechanisms responsible for heating the solar atmosphere in regions such as the chromosphere (partially ionized) and the corona (fully ionized) remain quantitatively unknown. This thesis demonstrates that the ions can be heated by Alfven waves with low frequencies in fully and partially ionized low beta plasmas, which is contrary to the customary expectation. For the partially ionized case, we find the heating process to be less efficient than the scenario with no ion-neutral collisions, and that the heating efficiency depends on the ratio of ion-neutral collision frequency to the ion

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35

Narita, Yasuhito. "Low frequency waves upstream and downstream of the terrestrial bow shock." Katlenburg-Lindau Copernicus GmbH, 2006. http://deposit.d-nb.de/cgi-bin/dokserv?idn=979493870.

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36

Lu, Paul ChihPeng. "Passive cancellation of low frequency sound waves using optimized embedded mechanisms." Diss., Restricted to subscribing institutions, 2009. http://proquest.umi.com/pqdweb?did=1876285421&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.

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37

Kim, Hyo Tae. "High frequency analysis of EM scattering from a circular conducting cylinder with dielectric/ferrite coating /." The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487322984315885.

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38

Kim, Tony C. "Interaction of Very Low Frequency (VLF) and Extremely Low Frequency (ELF) Waves in the Ionospheric Plasma and Parametric Antenna Concept." Wright State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=wright1486674973747427.

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39

TOIDA, MIEKO, and YUKIHARU OHSAWA. "Multi-ion-species effects on low-frequency electromagnetic fluctuations and energy transport." Cambridge University Press, 2006. http://hdl.handle.net/2237/10300.

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40

Bhakta, Nitin. "Extremely low frequency electromagnetic properties in marine environments with non-parallel interfaces." Thesis, King's College London (University of London), 2001. https://kclpure.kcl.ac.uk/portal/en/theses/extremely-low-frequency-electromagnetic-properties-in-marine-environments-with-nonparallel-interfaces(b13ce673-453d-4aca-925a-a7adf547cb69).html.

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41

Hill, Steven. "Measurements of low frequency acoustic backscatter from the sea surface." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/31022.

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The overall objective of this thesis was to predict, model and measure low frequency acoustic backscatter from the sea surface zone (SSZ). In particular, the objectives were fourfold: to relate the acoustic backscatter Doppler spectrum to the directional waveheight spectrum (DWS) through a perturbation analysis; to develop instrumentation suitable for measuring the properties of acoustic backscatter from the SSZ; to design and implement signal processing hardware and software to process raw data from the instrument; and to deploy the instrument and make measurements to test the validity of the

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42

Emelyanenko, Artyom. "Measurements and interpretation of lateral electromagnetic waves on the surface of low conductivity media." Thesis, Griffith University, 2020. http://hdl.handle.net/10072/393637.

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Measurements of electromagnetic fields are used for a wide range of applications. Often such measurements provide a non-destructive and non-intrusive way of obtaining information about the internal structure and other properties of the medium. Observations may be conducted across a very broad frequency range. Depending on the application domain, the frequency bands may range from the UHF band in biomedical engineering to the ULF band in geophysics. This thesis reports on several experiments where the electric and magnetic fields were measured on the surface of different media for the purpose o

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43

Diamanti, Kalliopi. "Active-sensor health monitoring of composite structures using low-frequency Lamb waves." Thesis, Imperial College London, 2005. http://hdl.handle.net/10044/1/8293.

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44

Drexler, Josef. "Determining the properties of low-frequency Farley-Buneman waves at high latitudes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ58028.pdf.

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45

Farell, Cesar E. "A theoretical investigation of the low-frequency sound generated by breaking waves." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0002/MQ40967.pdf.

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46

Eriksson, Tommy. "Multi-point Measurements of Ultra Low Frequency Waves in the Terrestrial Magnetosphere." Doctoral thesis, Stockholm, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4404.

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47

Landgren, Markus. "A Survey of Low-Frequency Plasma Waves in the Magnetosphere of Saturn." Thesis, KTH, Rymd- och plasmafysik, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-121328.

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The Cassini mission to Saturn carries a wide variety of instruments to investigate Saturn and its surroundings. Since Cassini is an orbiter, the spatial coverage of this mission far exceeds the few flybys made by earlier spacecraft. We focus on just one of the instruments, and conduct a preliminary analysis of data from five-channel waveform receiver (WFR) which is a part of the Radio and Plasma Wave Science instrument (RPWS). Two electric and three magnetic field components are measured in the 3 Hz to 2.5 kHz band and recorded in the time domain. Interference from other systems of the spacecr

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48

Meyer, Patrik K. (Patrik Kristof). "The impact of high frequency/low energy seismic waves on unreinforced masonry." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/38557.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2006.<br>Includes bibliographical references (p. [85]-87).<br>Traditionally, the high frequency components of earthquake loading are disregarded as a source of structural damage because of their small energy content and because their frequency is too high to resonate with the natural frequencies of structures. This thesis argues that higher frequency waves travelling through stiff masonry structures can trigger two types of failure mechanisms that have not yet been taken into account. First, the

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49

Myung, Noh Hoon. "A high frequency analysis of electromagnetic plane wave scattering by perfectly-conducting semi-infinite parallel plate and rectangular waveguides with absorber coated inner walls /." The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487267546980859.

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50

Shih, Wan-Chun. "Performance analysis of variable code rate signals transmitted over frequency-nonselective, slowly fading channels in a pulse-interference environment." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Sep%5FShih.pdf.

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