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Tesi sul tema "Electromagnetic"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Bekele, Ephrem Teshale. "Innovative Electromagnetic Field Manipulating Devices Based on Transformation Electromagnetics." Doctoral thesis, Università degli studi di Trento, 2015. https://hdl.handle.net/11572/368574.

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Quasiconformal Transformation Optics (QCTO) has been investigated and applied for the design of innovative electromagnetic field manipulating devises. The design is focused on enhancing radiation performance of antenna arrays. Towards this end, the QCTO approach has been utilized for the application of compressing dimension of linear array at the same time keeping its radiation performance equivalent to the original array. The basic QCTO is then generalized to allow an arbitrary physical arrangement coated with a suitable lens to exhibit the same radiating features of an arbitrary reference vi

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2

Bekele, Ephrem Teshale. "Innovative Electromagnetic Field Manipulating Devices Based on Transformation Electromagnetics." Doctoral thesis, University of Trento, 2015. http://eprints-phd.biblio.unitn.it/1499/1/Ph.D.Thesis.BEKELE-April.2015.Final.pdf.

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Quasiconformal Transformation Optics (QCTO) has been investigated and applied for the design of innovative electromagnetic field manipulating devises. The design is focused on enhancing radiation performance of antenna arrays. Towards this end, the QCTO approach has been utilized for the application of compressing dimension of linear array at the same time keeping its radiation performance equivalent to the original array. The basic QCTO is then generalized to allow an arbitrary physical arrangement coated with a suitable lens to exhibit the same radiating features of an arbitrary reference vi

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3

Sainath, Kamalesh K. "Robust Numerical Electromagnetic Eigenfunction Expansion Algorithms." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1480340627500682.

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4

Lei, Feiran. "Homogenization of Heterogeneous Composites by Using Effective Electromagnetic Properties." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1299513068.

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5

Bau-Hsing, Ann. "Computer-aided electromagnetic analysis of chokes and transformers." The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu1438255468.

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6

Lalley, Nicholas M. "Composite Electromagnetic Applications and Devices." University of Cincinnati / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1504878841254054.

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7

Park, Young C. (Young Chul) 1960. "A Study of Some Biological Effects of Non-Ionizing Electromagnetic Radiation." Thesis, University of North Texas, 1996. https://digital.library.unt.edu/ark:/67531/metadc278105/.

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The experimental studies of this work were done using a microwave cavity spectrometer, Escherichia coli (E-coli) bacteria, and other peripheral equipment. The experiment consists of two steps. First, a general survey of frequencies from 8 GHz to 12 GHz was made. Second, a detailed experiment for specific frequencies selected from the first survey were further studied. Interesting frequency dependent results, such as unusually higher growing or killing rates of E-coli at some frequencies, were found. It is also concluded that some results are genetic, that is, the 2nd, and 3rd subcultures showe

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8

Zhu, Boyuan. "The Electromagnetic Compatibility Problems of Integrated Circuits." Thesis, Griffith University, 2011. http://hdl.handle.net/10072/365527.

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With the constant speed of growth in semiconductor technology, integrated circuit (IC) has taken a considerable position in an electronic system. The integrated circuit is working in a low supply voltage with high operation frequency. The internal complexity and chip density are also increased dramatically. Modern microelectronic technology in wafer fabrication easily allows component densities to exceed one million transistors per die. So far, integrated circuits are suering from various and complicated electromagnetic environments. Being the heart of an electronic system, stability and relia

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9

Stevenson, Adrian Carl. "Electromagnetic biosensors." Thesis, University of Cambridge, 1995. https://www.repository.cam.ac.uk/handle/1810/252090.

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10

Cuff, David P. (David Preston). "Electromagnetic nanopositioner." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/38712.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2006.<br>Includes bibliographical references (p. 195-200).<br>This thesis presents the analysis, design, and control of a new class of magnetic nanopositioner. Applications for this class of positioner include sample positioning for scanning microscopy and interferometry, nanofabrication, vibration cancellation, biological cell tracking/positioning, and beam focusing/steering. The nanometer-resolution positioning required in these applications is often provided using piezoelectric ceramic actuators. The draw

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11

Nouri, Farnoosh Massoudian. "Electromagnetic aftereffects of near-death experiences." Thesis, University of North Texas, 2008. https://digital.library.unt.edu/ark:/67531/metadc9054/.

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The purpose of this quantitative study was first to investigate the comparative incidence of electromagnetic aftereffects (EMEs) during the past year among near-death experiencers (NDErs), people who experienced a close brush with death without an NDE (CBrs), and people who reported never having experienced a close brush with death (LCErs). The second purpose was to investigate a possible change in EME incidence among the three groups before and after a critical life event. The third purpose was to investigate the relationship between the reported overall depth and specific components of the s

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12

Fouda, Ahmed Elsayed. "Electromagnetic Time-Reversal Imaging and Tracking Techniques for Inverse Scattering and Wireless Communications." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1366202740.

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13

Moon, Haksu. "Robust Algorithms for Electromagnetic Field Computation with Conduction Currents and Kinetic Charge-Transport Models." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1440193844.

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14

Vong, Poh Kheong. "Finite element modelling of electromagnetic and coupled thermo-electromagnetic devices." Thesis, University of Bath, 2001. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760775.

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15

Bayat, Masoumeh. "Electromagnetic composite nanofibers." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/39894.

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Multifunctional composite nanofibers containing magnetite (Fe₃O₄) nanoparticles are developed in this work. The multifunctional composite nanofibers are proved to be electrically conductive and magnetically permeable. Polyacrylonitrile (PAN) is used as an appropriate polymer which is capable of being pyrolized to produce electrically conductive carbon nanofiber matrix. In order to develop magnetic nanofibers, various amounts of Fe₃O₄ nanoparticles ranging from 3 to 10wt.% are embedded in the PAN nanofiber matrix. In addition, the electromagnetic behaviour of nanocomposites made of two differen

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16

von, Keyserlingk Erik. "Electromagnetic Compatibility Scanner." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-285568.

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With the increasing amount of wireless devices in use today. All from Bluetooth headphonesto smart fridges, which communicates wirelessly to a server or phone. The needfor the radio frequency spectrum to be free from disturbances is necessarily. There aretoday regulations stating how much a device is allowed to transmit into the radio frequencyspectrum, this is to prevent and control disturbances from electronics whichdoes not intend to transmit into the radio frequency domain. In this report a setupis proposed to conduct near eld scanning of planar surfaces such as PCBs. This tolocate if a tr

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17

Schonhardt, Stefan. "Electromagnetic comb-drives." Tönning Lübeck Marburg Der Andere Verl, 2009. http://d-nb.info/995770131/04.

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18

Wang, Xiaochuan. "A Domain Decomposition Method for Analysis of Three-Dimensional Large-Scale Electromagnetic Compatibility Problems." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1338376950.

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19

Yao, Shun. "Origami Reconfigurable Electromagnetic Systems." FIU Digital Commons, 2017. https://digitalcommons.fiu.edu/etd/3514.

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With the ever-increasing demand for wireless communications, there is a great need for efficient designs of electromagnetic systems. Reconfigurable electromagnetic systems are very useful because such designs can provide multi-functionality and support different services. The geometrical topology of an electromagnetic element is very important as it determines the element’s RF performance characteristics. Origami geometries have significant advantages for launch-and-carry electromagnetic devices where devices need to fold in order to miniaturize their size during launch and unfold in order to

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20

Young, André. "Mesh termination schemes for the finite element method in electromagnetics /." Link to the online version, 2007. http://hdl.handle.net/10019/735.

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21

Sundberg, Garth. "Numerical Modeling of Electromagnetic Scattering in Explosive Granular Media." PDXScholar, 2010. https://pdxscholar.library.pdx.edu/open_access_etds/865.

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Terahertz (THz) reflection and transmission spectroscopy is a promising new field with applications in imaging and illicit material detection. One particularly useful application is for the detection of improvised explosive devices (IEDs) which is a favorite weapon of global terrorists. Explosive materials have been shown to have a unique spectral signature in the THz band which can be used to identify the explosives. However, the initial measurements performed on the explosive samples do not account for the modulation of the spectral features by random scattering that will be prevalent with a

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22

Liebfried, Oliver. "The Investigation of Electromagnetic Processes in Electromagnetic Launchers Using Colossal Magnetoresistance Sensors." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2011. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20110615_180000-02329.

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The development of rails and armatures which ensure a sliding solid-to-solid contact during the whole projectile acceleration is a great challenge in the field of railgun technology. Multifaceted physics exists at the sliding contact interface: The current concentrates at the rear of the interface due to magnetic diffusion processes and the fast armature movement. Consequently, Joule heating leads to enhanced wear in this region. In this dissertation, magnetic diffusion in railguns is investigated by means of measuring magnetic fields with CMR-B-scalar sensors at static and dynamic experimenta

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23

Padmanabhan, Mahadevan. "Wrinkling and Springback in Electromagnetic Sheet Metal Forming and electromagnetic Ring Compression." The Ohio State University, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=osu1393078676.

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24

Vallon, Henri. "Focusing high-power electromagnetic waves using time-reversal." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLC006/document.

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L'objectif de la thèse a été de mettre en place dans un premier temps des modèles analytiques et statistiques permettant d'évaluer les performances d'un système à retournement temporel de fortes-puissances puis de les vérifier grâce à des mesures.Des campagnes de mesures ont alors permis de vérifier les modèles. Des simulations numériques ont aussi montrées les possibilités offertes par un tel système.En parallèle, des travaux sur l'impact des antennes dans une chambre réverbérantes ont été menés afin d'évaluer les performances d'un système ayant plusieurs sorties.Les résultats de thèses ont p

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25

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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26

Haupt, Christian. "Electromagnetic properties of baryons." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=980373271.

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27

Dimitrakopoulos, Nikolaos. "Electromagnetic MEMS RF Switch." Thesis, University of Leeds, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485179.

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This thesis describes the design, fabrication and test of an electromagne~ically actuated RF MEMS switch. The actuator was fabricated using two different wafers. The first is steel where the coil is been made with a soft magnetic material forming an inner and an outer pole. On the saine wafer the transmission line and'the beam support are present. Silicon has been used as the second wafer to fabricate the mover. The mover consists of the same soft magnetic material as used for the pot core. The switch contact along with the soft magnet is held by a fixed-fixed SU-8 beam. The mover is finally b

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28

MacLeod, Leesa Marie. "Electromagnetic interference stress testing." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq41465.pdf.

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29

Parsi, Nikhil. "Electromagnetic effects on soybeans." Diss., Columbia, Mo. : University of Missouri-Columbia, 2007. http://hdl.handle.net/10355/5041.

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Thesis (M.S.)--University of Missouri-Columbia, 2007.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on April 2, 2008) Includes bibliographical references.

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30

Lee, Aaron Mark. "Electromagnetic properties of molecules." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243017.

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31

Still, Benjamin. "T2K ND280 Electromagnetic calorimeter." Thesis, University of Sheffield, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.522357.

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32

Goudevenos, Apostolos. "Through water electromagnetic communications." Thesis, University of Liverpool, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.494085.

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Underwater communications at high frequencies have a wide variety of applications including diving, military equipment, oil and gas exploration in offshore fields as well as oceanographic mapping. Wireless communications are much more practical than hardwire communications due to the nature of the ocean environment. Currently the most commonly applied method for underwater communications is acoustic communications but have some serious disadvantages. These include low data rate, shadowing and reflections. Optical fibre communications have been offered as a viable alternative but their use is l

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33

Maguire, Yael G. 1975. "Microslots : scalable electromagnetic instrumentation." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/33677.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, 2004.<br>Includes bibliographical references (leaves 171-178).<br>This thesis explores spin manipulation, fabrication techniques and boundary conditions of electromagnetism to bridge the macroscopic and microscopic worlds of biology, chemistry and electronics. This work is centered around the design of a novel electromagnetic device scalable from centimeters to micrometers called a microslot. By creating a small slot in a planarized waveguide called a microstrip, the

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34

Pressl, Daniel G. (Daniel Gerd). "Investigation of electromagnetic welding." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/53253.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2009.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references.<br>We propose several methodologies to study and optimize the electromagnetic process for Electromagnetic Forming (EMF) and Welding (EMW), thereby lowering the necessary process energy up to a factor of three and lengthening the life-time of EMW compression coils. We present a new theoretical approach to calculate a so-called critical kinetic energy to achieve a proper EMW joint, which is related to the volume

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35

Flint, James Alan. "Efficient automotive electromagnetic modelling." Thesis, Loughborough University, 2000. https://dspace.lboro.ac.uk/2134/33758.

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The Transmission Line Modelling (TLM) method is applied to the electromagnetic modelling of vehicles. Implications of increasing frequencies in computer models of electromagnetic compatibility (EMC) studies are discussed. Efficient algorithms and resource management strategies are developed With a view to producing accurate results m a realistic computational run time. Theoretical aspects covered are: (1) the development and accuracy of the TLM method; (2) an improved Partial Huygens' surface for plane wave excitation; (3) an evaluation of high-performance local and global absorbing boundary c

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36

Levchenko, A., Світлана Григорівна Золотова, Светлана Григорьевна Золотова, and Svitlana Hryhorivna Zolotova. "Electromagnetic radiation and health." Thesis, Сумський державний університет, 2013. http://essuir.sumdu.edu.ua/handle/123456789/31097.

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Electrical hazards Strong radiation can induce current capable of delivering an electric shock to persons or animals. It can also overload and destroy electrical equipment. The induction of currents by oscillating magnetic fields is also the way in which solar storms disrupt the operation of electrical and electronic systems, causing damage to and even the explosion of power distribution transformers, blackouts (as occurred in 1989), and interference with electromagnetic signals (e.g. radio, TV, and telephone signals). When you are citing the document, use the following link http://essuir.sumd

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37

Chaudhary, Sumeet. "Lightweight Electromagnetic Induction Motor." University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1581333548692675.

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38

Millet, Floyd W. "Improving Electromagnetic Bias Estimates." Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd525.pdf.

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39

Xie, Zhongqiang. "Fourth-order finite difference methods for the time-domain Maxwell equations with applications to scattering by rough surfaces and interfaces." Thesis, Coventry University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369842.

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40

Mohajer, Iravani Baharak. "Electromagnetic interference reduction using electromagnetic bandgap structures in packages, enclosures, cavities, and antennas." College Park, Md.: University of Maryland, 2007. http://hdl.handle.net/1903/7669.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2007.<br>Thesis research directed by: Dept. of Electrical and Computer Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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41

Jones, Travis Hamilton. "On the Interactions of Electromagnetic Fields with Human Cells." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1587493583447491.

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42

Berry, Yoke. "The effect of pulsed electromagnetic fields on protein unfolding." Access electronically, 2005. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20060713.142625/index.html.

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43

Germany, Garrett Ross. "ANALYSIS OF ELECTROMAGNETIC LAUNCHER DESIGN AND MODELING." DigitalCommons@CalPoly, 2016. https://digitalcommons.calpoly.edu/theses/1563.

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This thesis derives working expressions from electromagnetic physical laws to gain a deeper understanding of the nature of railguns. The expressions are refined for ease of use and then compared to electromagnetic simulators that solve complex equations that arise from different rail geometry. Further simplifications lead to an expression for the final velocity of the projectile and showcase the importance of the system resistance to projectile flux gain ratio. A Simulink simulation then incorporates the resulting non-linear differential equations and approximates the projectile velocity over

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44

Naftali, Verena Kashikuka. "Implementation of a reverberation chamber for electro-magnetic compatibility measurements." Thesis, Cape Peninsula University of Technology, 2017. http://hdl.handle.net/20.500.11838/2566.

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Thesis (MTech (Electrical Engineering))--Cape Peninsula University of Technology, 2017.<br>This research project focuses on the implementation of a Reverberation Chamber (RC) by the transformation of an existing electromagnetically shielded room. The reverberation chamber is a kind of shielded room designed to create a statistically random internal electromagnetic environment. The reverberating environment makes it possible to obtain high field strengths from a relatively low input power. The electric fields in the chamber have to be stirred to achieve a statistically uniform field. The first

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45

Kimn, Edward Sun. "A parametric finite element analysis study of a lab-scale electromagnetic launcher." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/39498.

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The purpose of the study is to better understand the factors that affect melt-wear in the armature-to-rail contact interface of an electromagnetic launcher (EML). In order to investigate the factors, the study uses finite element analysis (FEA) to vary parameters of a lab-scale EML at the Georgia Institute of Technology. FEA is used due to the complex nature of the system, which includes the geometry and various engineering aspects that the EML incorporates. The study focuses on an uncoupled analysis of the structural, electromagnetic (EMAG), thermal, and modal aspects. The reason for the unco

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46

Lintz, William A. "Electromagnetic resonances of metallic bodies." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1997. http://handle.dtic.mil/100.2/ADA333440.

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Thesis (M.S. in Electrical Engineering) Naval Postgraduate School, June 1997.<br>Thesis advisors, Richard W. Adler, Jovan E. Lebaric. Includes bibliographical references (p. 45). Also available online.

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47

Wawrzyniak, Daniel J. "Electromagnetic imaging of axisymmetric scatterers." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1997. http://handle.dtic.mil/100.2/ADA333395.

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48

Ranlöf, Martin. "Electromagnetic Analysis of Hydroelectric Generators." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-146629.

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Hydropower maintains its position as the most important source of renewable electric energy in the world. The efficiency of large hydropower plants is unsurpassed, and after more than hundred years of development, the technology is mature and highly reliable. While new hydro resources are currently being developed in Asia and South America, most European countries go through a phase of intense refurbishment and upgrading of existing plants. Challenges faced by the hydropower industry include a knowledge transfer to new generations and the adaptation of unit designs to meet new operational requ

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49

Adamu, Tigist Atnafseged. "Electromagnetic Interference in Dwnhole Applications." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elkraftteknikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-19394.

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SummaryElectromagnetic compatibility (EMC) and electromagnetic interference (EMI) are topics which have been of concern to electrical industry for many years. Excessive generation of electromagnetic noise and interference, resulting inadequate EMC, is one potential source of interaction and performance degradation which may reduce operational effectiveness of the devices. Because of this, EMC testing services and regulation imposed by governments have forced product designer to pay close attention electromagnetic interference level of their products.For improving oil and gas production recover

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50

Ullrich, Stefan [Verfasser]. "Electromagnetic Drift Waves / Stefan Ullrich." Greifswald : Universitätsbibliothek Greifswald, 2011. http://d-nb.info/1015149332/34.

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