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Дисертації з теми "Electric waves Measurement"

Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 19 липня 2025

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1

Matandirotya, Electdom. "Measurement and modelling of geomagnetically induced currents (GIC) in power lines." Thesis, Cape Peninsula University of Technology, 2016. http://hdl.handle.net/20.500.11838/2459.

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Thesis (DTech (Electrical Engineering))--Cape Peninsula University of Technology, 2016.<br>Geomagnetically induced currents (GIC) are currents induced in ground-based conductor networks in the Earth's surface. The GIC are driven by an electric eld induced by geomagnetic variations which are a result of time-varying magnetospheric-ionospheric currents during adverse space weather events. Several studies have shown that there is a likelihood of technological damage (the power grid) in the mid- and low-latitude regions that could be linked to GIC during some geomagnetic storms over the past

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2

Chowdhury, Rehana Momtaz Engineering &amp Information Technology Australian Defence Force Academy UNSW. "Use of Higher Order Harmonics from a Limiter to Improve the Single-Tone Detection Performance of an Envelope Detector." Awarded by:University of New South Wales - Australian Defence Force Academy. Engineering & Information Technology, 2009. http://handle.unsw.edu.au/1959.4/43512.

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The limiter is a commonly used device in communication receiving systems to remove the amplitude variations of the received signal, but it is usually observed that limiter degrades the envelope detection performance of a single tone. In this thesis, it is demonstrated that the limiter-generated third harmonic can be used to improve the envelope detection performance of a single tone over that of the linearly processed fundamental. Differences in the probability distributions of the limiter-generated harmonics cause differences in their detection probabilities, which lead to differences in

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3

Huang, Liling. "Electromechanical Wave Propagation in Large Electric Power Systems." Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/11054.

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In a large and dense power network, the transmission lines, the generators and the loads are considered to be continuous functions of space. The continuum technique provides a macro-scale analytical tool to gain an insight into the mechanisms by which the disturbances initiated by faults and other random events propagate in the continuum. This dissertation presents one-dimensional and two-dimensional discrete models to illustrate the propagation of electromechanical waves in a continuum system. The more realistic simulations of the non-uniform distribution of generators and boundary conditions

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4

Matos, Carmen. "Robotically Controlled Measurement System for Millimeter-Wave Antennas." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1588180162492972.

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5

Friedlander, Jeffrey B. "Wireless Strain Measurement with Surface Acoustic Wave Sensors." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1306874020.

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6

Hamrita, Takoi K. "On-line digital signal processing methods for the correction of errors in high voltage power waveform measurements." Diss., Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/15921.

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7

Boykov, Nikolay D. "Measurements of the electrical properties of coal measure rocks." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4715.

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Thesis (M.S.)--West Virginia University, 2006.<br>Title from document title page. Document formatted into pages; contains xi, 89 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 88-89).

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8

Nordin, Daniel. "Optical frequency modulated continuous wave (FMCW) range and velocity measurements." Doctoral thesis, Luleå, 2004. http://epubl.luth.se/1402-1544/2004/43.

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9

Danielson, James Robert. "Measurement of Landau damping of electron plasma waves in the linear and trapping regimes /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC IP addresses, 2002. http://wwwlib.umi.com/cr/ucsd/fullcit?p3044767.

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10

Goldberg, Benjamin M. "Electric Field Measurements in Non-Equilibrium ElectricDischarge Plasmas Using Picosecond Four-Wave Mixing." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1449236861.

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11

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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12

Henderson, Gregory N. "Semiconductor quantum electron wave transport, diffraction, and interference : analysis, devices, and measurement." Diss., Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/15716.

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13

Smith, Jared. "Improvement of Continuous Wave Radar Measurements in a Partially Controlled Environment." Wright State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=wright1496094047730053.

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14

Bernstein, Joseph Barry. "Electrical characterization of polymeric insulation by electrically stimulated acoustic wave measurements." Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/54340.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1990.<br>Includes bibliographical references (leaves 207-211).<br>by Joseph Barry Bernstein.<br>Ph.D.

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15

Xu, Minnan 1979. "Local measurement of the pulse wave velocity using Doppler ultrasound." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/16868.

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Thesis (M.Eng. and S.B.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.<br>Includes bibliographical references (p. 77-79).<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cardiovascular disease is the leading cause of death in many developed countries. Arteries of people suffering from this disease become stiff and blocked by fatty deposits. In recent years, non-invasive imaging techniques have been playing an increasingly important role

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16

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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17

Kayra, Seda. "Imaging Solar Cells Using Terahertz Waves." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12612920/index.pdf.

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In this thesis, Terahertz Time-Domain spectroscopy (THz-TDS) was used in order to measure the electrical properties of silicon solar cells. The advantage of THz-TDS is that it allows us to measure the electrical properties without electrical contacts. In order to perform these measurements, a reflection based system was constructed and the changes in the peak amplitude in the time-domain under a, 450mW 808 nm continuous wave laser source were measured. The solar cell that was used in this thesis was manufactured in Middle East Technical University Microelectromechanical Systems (METU-MEMS) res

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18

Wendt, Martin. "Experimental Investigations of Wave Motion and Electric Resistance in Collisionfree Plasmas." Doctoral thesis, Stockholm : Tekniska högsk, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3199.

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19

Starks, Michael James 1971. "Measurement of the conjugate propagation of VLF waves by matched filter and application to ionospheric diagnosis." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/80126.

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Thesis (Sc.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.<br>Includes bibliographical references (p. 173-176).<br>by Michael James Starks.<br>Sc.D.

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20

Channamallu, Aditya. "Software Defined Radio Based Modulated Scatterer Antenna Measurement." PDXScholar, 2018. https://pdxscholar.library.pdx.edu/open_access_etds/4447.

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The modulated scattering technique is used in conjunction with a Software Defined Radio (SDR) dongle to obtain a software-based modulated signal output. SDR# is the software package used to get spectrum analysis of the modulated signal. A transmitter yagi antenna sends a 2.304GHz signal on to an antenna connected to a reflector coefficient modulator (700Hz) and the modulated waves are received by another yagi. The receiver yagi antenna is then connected to a frequency converter to convert a 2.304GHz signal to a 144MHz dongle input signal which finally puts the scattered output on computer soft

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21

Higginbotham, Steven. "Enhanced Electrical Impedance Sensing of Biological Cells Using Travelling Wave Dielectrophoresis Manipulation." Thesis, Griffith University, 2007. http://hdl.handle.net/10072/367544.

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Electrokinetics involves techniques of applying forces and torques to fluids or suspended microscopic particles like biological cells, by exploiting their electrical properties and their interactions with electric fields. This has been demonstrated many times to have significant applications in lab-on-a-chip systems. Biological cells and other microparticles are dielectrically-heterogeneous structures, and therefore each different particle has a distinct dielectric frequency-response signature. This dielectric distinction allows sub-populations of particles to be separated by different criteri

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22

Boyer, Laura L. "Carrier-phase wrap-up caused by rotating a global positioning system antenna and its effect on measurements." Ohio : Ohio University, 1999. http://www.ohiolink.edu/etd/view.cgi?ohiou1175890688.

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23

Pozderac, Jonathan M. "Refractivity Inversion Utilizing X-Band Array Measurement System." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1498690950705285.

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24

Kowalski, Elizabeth J. (Elizabeth Joan). "Miter bend loss and higher order mode content measurements in overmoded millimeter-wave transmission lines." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/62444.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2010.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 119-121).<br>High power applications require an accurate calculation of the losses on overmoded corrugated cylindrical transmission lines. Previous assessments of power loss on these lines have not considered beam polarization or higher order mode effects. This thesis will develop a theory of transmission that includes the effect of linearly polarized higher order modes on power loss in overmoded co

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25

Wachsmuth, Matthew George. "Measurement and Characterization of Terahertz Radiation Propagating Through a Parallel Plate Waveguide." PDXScholar, 2011. https://pdxscholar.library.pdx.edu/open_access_etds/317.

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As the amount of study into the terahertz (THz) region of the electromagnetic spectrum steadily increases, the parallel plate waveguide has emerged as a simple and effective fixture to perform many experiments. The ability to concentrate THz radiation into a small area or volume enables us to analyze smaller samples and perform more repeatable measurements, which is essential for future research. While the fundamental physics of PPW transmission are understood mathematically, the practical knowledge of building such a fixture for the THz domain and taking measurements on it with a real system

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26

Calder, Bruce. "Direct current resistance measurement structure for determining line width and metal thickness variations in surface acoustic wave devices." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq36672.pdf.

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27

Park, Sang-Hoon Ph D. Massachusetts Institute of Technology. "Verification of d-wave pairing symmetry by microwave intermodulation distortion measurements in yttrium barium copper oxide." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/39732.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2004.<br>Includes bibliographical references (p. 113-119).<br>We report measurements of the temperature and power dependence of the microwave frequency intermodulation distortion (IMD) in high quality pulsed laser deposition (PLD) Yttrium Barium Copper Oxide (YBCO) on LaAlO3 substrate. A low-temperature (T < 30 K) increase in IMD is the observation of an upturn of the nonlinear coefficient of the quadratic field dependence of the penetration depth. This IMD upturn is limited by the non

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28

Gunn, D. A. "Electronic instrumentation for the measurement of velocities and attenuations of shear and compressional seismic waves in rocks and soils under in-situ stress conditions." Thesis, University of Manchester, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.690902.

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29

Choo, Hyunwook. "Engineering behavior and characterization of physical-chemical particulate mixtures using geophysical measurement techniques." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/52178.

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Natural geomaterials exhibit a wide range in size, physical properties, chemical properties, and mechanical behaviors. Soils that are composed of mixtures of particles with different physical and chemical properties pose a challenge to characterization and quantification of the engineering properties. This study examined the behavior of particulate mixtures composed of differently sized silica particles, mixtures composed of aluminosilicate and organic carbon particles, and mixtures composed of particles with approximately three orders of magnitude difference in particle size. This experimenta

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30

Kamf, Tobias. "Automated Production Technologies and Measurement Systems for Ferrite Magnetized Linear Generators." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-330866.

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The interest in breaking the historical dependence on fossil energy and begin moving towards more renewable energy sources is rising worldwide. This is largely due to uncertainties in the future supply of fossil fuels and the rising concerns about humanity’s role in the currently ongoing climate changes. One renewable energy source is ocean waves and Uppsala University has since the early 2000s been performing active research in this area. The Uppsala wave energy concept is centered on developing linear generators coupled to point absorbing buoys, with the generator situated on the seabed and

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31

Engholm, Marcus. "Ultrasonic Arrays for Sensing and Beamforming of Lamb Waves." Doctoral thesis, Uppsala universitet, Signaler och System, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-122189.

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Non-destructive testing (NDT) techniques are critical to ensure integrity and safety of engineered structures. Structural health monitoring (SHM) is considered as the next step in the field enabling continuous monitoring of structures. The first part of the thesis concerns NDT and SHM using guided waves in plates, or Lamb waves, to perform imaging of plate structures. The imaging is performed using a fixed active array setup covering a larger area of a plate. Current methods are based on conventional beamforming techniques that do not efficiently exploit the available data from the small array

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32

Wang, Qi. "Estimation of Refractivity Conditions in the Marine Atmospheric Boundary Layer from Range and Height Measurement of X-band EM Propagation and Inverse Solutions." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1565885420888906.

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33

Du, Xinpeng. "Laser-Ultrasonic Measurement of Single-Crystal Elastic Constants from Polycrystalline Samples by Measuring and Modeling Surface Acoustic Wave Velocities." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1524177819455643.

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34

Wallace, Jon. "Modeling Electromagnetic Wave Propagation in Electrically Large Structures." BYU ScholarsArchive, 2003. https://scholarsarchive.byu.edu/etd/91.

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Existing unified numerical electromagnetic methods are often unable to analyze electrically large structures due to the amount of memory and processing power required, necessitating approximate analyses with limited applicability. In this research a hybrid modeling methodology is adopted to solve these complex problems more efficiently than unified numerical methods and more accurately than analytical methods. Electromagnetic modeling problems are divided into two or more levels of scale. Each level analyzes a specific level of detail and only promotes the required information to the next leve

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35

Karri, Avinash. "Employment of dual frequency excitation method to improve the accuracy of an optical current sensor, by measuring both current and temperature." Thesis, University of North Texas, 2008. https://digital.library.unt.edu/ark:/67531/metadc9766/.

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Optical current sensors (OCSs) are initially developed to measure relatively large current over a wide range of frequency band. They are also used as protective devices in the event a fault occurs due to a short circuit, in the power generation and distribution industries. The basic principal used in OCS is the Faraday effect. When a light guiding faraday medium is placed in a magnetic field which is produced by the current flowing in the conductor around the magnetic core, the plane of polarization of the linearly polarized light is rotated. The angle of rotation is proportional to the magnet

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36

Long, Elena A. "Polarized ³He(e,e'n) Asymmetries in Three Orthogonal Measurements." Kent State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=kent1350487441.

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37

Kim, Myeongsub. "Microscale optical thermometry techniques for measuring liquid phase and wall surface temperatures." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/43754.

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Thermal management challenges for microelectronics are a major issue for future integrated circuits, thanks to the continued exponential growth in component density described by Moore¡¯s Law. Current projections from the International Technology Roadmap for Semiconductors predict that local heat fluxes will exceed 1 kW/cm2 within a decade. There is thus an urgent need to develop new compact, high heat flux forced-liquid and evaporative cooling technologies. Thermometry techniques that can measure temperature fields with micron-scale resolution without disturbing the flow of coolant would be

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38

Tuncay, Orbay. "Wireless Strain Gauge System in a Multipath Environment." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1222089977.

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39

Spencer, Quentin H. "Transmission Strategies for Wireless Multi-user, Multiple-Input, Multiple-Output Communication Channels." Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd378.pdf.

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40

Shabara, Yahia. "Establishing Large-Scale MIMO Communication: Coding for Channel Estimation." The Ohio State University, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1618578732285999.

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41

Gaudaire, François. "Caractérisation de l'affaiblissement électromagnétique de composants du batiment." Grenoble INPG, 1997. http://www.theses.fr/1997INPG0176.

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Ce travail presente la mesure et la modelisation de l'affaiblissement electromagnetique de composants du batiment, afin de permettre une meilleure caracterisation de la propagation radioelectrique a l'interieur des batiments. Dans un premier temps, les techniques classiques de prevision de la propagation electromagnetique sont decrites, et une methode basee sur des echanges energetiques est proposee. Cela amene a considerer l'indice d'affaiblissement electromagnetique en champ diffus d'une paroi, dont la mesure en salles reverberantes est decrite. Le protocole et le principe de la mesure sont

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42

Thompson, Dane C. "Characterization and Design of Liquid Crystal Polymer (LCP) Based Multilayer RF Components and Packages." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10498.

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This thesis discusses the investigation and utilization of a new promising thin-film material, liquid crystal polymer (LCP), for microwave and millimeter-wave (mm-wave [>30 GHz]) components and packages. The contribution of this research is in the determination of LCP's electrical and mechanical properties as they pertain to use in radio frequency (RF) systems up to mm-wave frequencies, and in evaluating LCP as a low-cost substrate and packaging material alternative to the hermetic materials traditionally desired for microwave circuits at frequencies above a few gigahertz (GHz). A study of LC

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43

Gardner, Robert Matthew. "A Wide-Area Perspective on Power System Operation and Dynamics." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/26779.

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Classically, wide-area synchronized power system monitoring has been an expensive task requiring significant investment in utility communications infrastructures for the service of relatively few costly sensors. The purpose of this research is to demonstrate the viability of power system monitoring from very low voltage levels (120 V). Challenging the accepted norms in power system monitoring, the document will present the use of inexpensive GPS time synchronized sensors in mass numbers at the distribution level. In the past, such low level monitoring has been overlooked due to a perceived

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44

"Harmonic impedance estimation of a power system implementing frequency domain measurement techniques." Thesis, 2012. http://hdl.handle.net/10210/5585.

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M.Ing.<br>The increased used of non-linear loads within the power system during recent years have resulted in deviations from the perfect sinusoidal voltage and current waveform. This deviation from the perfect sinusoidal waveform can be expressed according to Fourier analysis by a set of co-sinusoidal waveforms having frequencies, which are a multiple of the fundamental frequency, referred to as harmonics. Non-linear loads are generally characterised by harmonic currents. It is therefore often preferred to express the harmonic emission limits in terms of harmonic currents rather than harmonic

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45

Nino, Hernandez Edwin Enrique. "Harmonic impedance and harmonic source determination based on field measurements." Master's thesis, 2009. http://hdl.handle.net/10048/848.

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Thesis (M.Sc.)--University of Alberta, 2010.<br>Title from PDF file main screen (viewed on Apr. 13, 2010). A thesis submitted to the Faculty of Graduate Studies and Research in partial fulfillment of the requirements for the degree of Master of Science, Department of Electrical & Computer Engineering, University of Alberta. Includes bibliographical references.

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46

Mawrey, Robert Stanley. "Predicted and measured arrival rates of meteors over forward-scatter links." Thesis, 1991. http://hdl.handle.net/10413/6909.

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Investigations into currently accepted methods of modelling variations in the arrival rate of meteors over forward-scatter meteor links have revealed some shortcomings. In these investigations, particular emphasis is placed on the work of Rudie due to its current acceptance in the literature. The non-uniform radiant distribution of meteors measured by Davies and modelled by Rudie, is critically examined and predictions using these models are compared with measured results taken over two forward-scatter links in the Southern Hemisphere. A new, alternative method of including the effect of non-u

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47

Lohmeier, Stephen Paul. "Supervised classification of natural targets using millimeter-wave multifrequency polarimetric radar measurements." 1996. https://scholarworks.umass.edu/dissertations/AAI9619410.

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This dissertation classifies trees, snow, and clouds using multiparameter millimeter-wave radar data at 35, 95, and 225 GHz. Classification techniques explored include feedforward multilayer perceptron neural networks trained with standard backpropagation, Gaussian and minimum distance statistical classifiers, and rule-based classifiers. Radar data products, serving as features for classification, are defined, radar and in situ data are presented, scattering phenomenology is discussed, and the effect of data biases are analyzed. A neural network was able to discriminate between white pine tree

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48

Vuthaluru, Rupa. "MF radar observations of D-region electron densities at Adelaide / by Rupa Vuthaluru." 2003. http://hdl.handle.net/2440/22029.

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"July, 2003"<br>Includes bibliographical references (leaves 177-183)<br>xxii, 183 leaves : ill. (some col.) ; 30 cm.<br>Title page, contents and abstract only. The complete thesis in print form is available from the University Library.<br>Thesis (Ph.D.)--University of Adelaide, School of Chemistry and Physics, Discipline of Physics and Mathematical Physics, 2004

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49

Li, Lihua. "Retrieval of atmospheric attenuation using ground -based and airborne millimeter-wave cloud radar measurements." 2000. https://scholarworks.umass.edu/dissertations/AAI9988816.

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Cloud measurements at millimeter-wave frequencies are affected by attenuation due to atmospheric gases, clouds and precipitation. Estimation of the true equivalent radar reflectivity, Ze, is complicated because extinction mechanisms are not well characterized at these short wavelengths. This dissertation discusses cloud radar calibration and intercomparison of airborne and ground-based radar measurements, and describes two attenuation retrieval algorithms. The first one is the dual-radar method, which is based on dual 95 GHz radar measurements of the same cloud and precipitation volumes collec

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50

Spann, Michael Dwight. "An adaptive protocol for use over meteor scatter channels." Thesis, 1987. http://hdl.handle.net/10413/6906.

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Modem technology has revived interest in the once popular area of meteor scatter communications. Meteor scatter systems offer reliable communications in the 500 to 2000 km range all day, every day. Recent advances in microprocessor technology have made meteor scatter communications a viable and cost effective method of providing modest data rate communications. A return to the basic fundamentals has revealed characteristics of meteor scatter propagation that can be used to optimize the protocols for a meteor scatter link. The duration of an underdense trail is bounded when its initial amplitud

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