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Teses / dissertações sobre o tema "Radio frequency"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 25 de julho de 2025

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1

Ker, Louise Moira. "Radio AGN evolution with low frequency radio surveys." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/7616.

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Supermassive black holes are leading candidates for the regulation of galaxy growth and evolution over cosmic time, via ‘feedback’ processes, whereby outflows from the Active Galactic Nuclei (AGN) halt star formation within the galaxy. AGN feedback is generally thought to occur in two modes, high-excitation (HERG, or ‘quasar-mode’) and low-excitation (LERG or ’radio-mode’) each having a different effect on the host galaxy. LERGs curtail the growth of the most massive galaxies, whereas HERGs are thought to be activated by mergers/interactions, switching off star formation at high redshift. A cr

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2

Finlay, Chris. "Radio Frequency Interference: Simulations for Radio Interferometry Arrays." Master's thesis, Faculty of Science, 2021. http://hdl.handle.net/11427/33716.

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Radio Frequency Interference (RFI) is a massive problem for radio observatories around the world. Due to the growth of telecommunications and air travel RFI is increasing exactly when the world's radio telescopes are increasing significantly in sensitivity, making RFI one of the most pressing problems for astronomy in the era of the Square Kilometre Array (SKA). Traditionally RFI is dealt with through simple algorithms that remove unexpected rapid changes but the recent explosion of machine learning and artificial intelligence (AI) provides an exciting opportunity for pushing the state-of-the-

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3

Shenouda, Hany H. "An agile frequency synthesizer for frequency hopping radio." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0016/MQ49683.pdf.

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4

Chen, Bing-Hung. "Inductively coupled radio-frequency discharges." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244566.

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5

Heikkinen, Jouko. "TELEMETRY AND RADIO FREQUENCY IDENTIFICATION." International Foundation for Telemetering, 1999. http://hdl.handle.net/10150/607334.

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International Telemetering Conference Proceedings / October 25-28, 1999 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>Comparison of short-range telemetry and radio frequency identification (RFID) systems reveals that they are based on very similar operating principles. Combining the identification and measurement functions into one transponder sensor offers added value for both RFID and telemetry systems. The presence of a memory (e.g. FRAM) in the transponder, required for ID information, can also be utilized for storing measurement results. For passive transponders low pow

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6

Andrews, Seth Dixon. "Extensions to Radio Frequency Fingerprinting." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/95952.

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Radio frequency fingerprinting, a type of physical layer identification, allows identifying wireless transmitters based on their unique hardware. Every wireless transmitter has slight manufacturing variations and differences due to the layout of components. These are manifested as differences in the signal emitted by the device. A variety of techniques have been proposed for identifying transmitters, at the physical layer, based on these differences. This has been successfully demonstrated on a large variety of transmitters and other devices. However, some situations still pose challenges: So

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7

Viyyure, Uday Kiran Varma. "Frequency Assignments in Radio Networks." Kent State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=kent1209060158.

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8

Fernandes, Rui Miguel Félix. "Object signature in radio frequency." Master's thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/13708.

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Mestrado em Engenharia Eletrónica e Telecomunicações<br>The RF signature can be consider as a fingerprint of an object when submitted to electromagnetic radiation. Based on this concept, the initial goal of this work was to elaborate a comparative analysis of the Radio Frequency signature of different materials. Through the design of a prototype based on an adapted Wi-Fi network was developed an innovative system capable of distinguishing materials with the analysis of their interference in the propagated channel. In order to refine this distinction was utilized a signal processing tool, the

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9

Matarrese, Vincent D. "Tapered radio frequency transmission lines." PDXScholar, 1992. https://pdxscholar.library.pdx.edu/open_access_etds/4329.

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A transformation used to obtain solutions for the beam parameter equation of fiber optics is applied to the second order differential equation for nonuniform transmission lines. Methods are developed for deriving possible transmission line tapers from known solutions of the transformed equation. This study begins with a comprehensive overview of previous work done to obtain closed-form solutions for the transmission line equations. Limitations of the lumped parameter model are also discussed. As part of this thesis, a tapered transmission line is constructed, based on one of the solutions obta

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10

Blackard, Kenneth Lee. "Measurements and models of radio frequency impulsive noise inside buildings." Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-08182009-040318/.

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11

Kunselman, Gary L. "Radio frequency power amplifiers for portable communication systems." Thesis, Virginia Tech, 1992. http://hdl.handle.net/10919/41493.

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<p>Portable communication systems require, in part, high-efficiency radio frequency power amplifiers (RF PA) if battery lifetime is to be conserved. Conventional amplifier classifications and definitions are presented in a unified and concise format. The Bipolar Junction Transistor (BJT) and Metal-Semiconductor Field Effect Transistor (MESFET) are evaluated as active devices in high-efficiency RF PA designs. Two amplifier classes (class CE and class F) meet the system requirements of an 850 MHz operating frequency, a power output of 3 W, a battery supply voltage of 9 Vdc, and a sinusoidal-type

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12

Bracht, Roger, Jeff Dimsdle, Dave Rich, and Frank Smith. "RADIO FREQUENCY OVERVIEW OF THE HIGH EXPLOSIVE RADIO TELEMETRY PROJECT." International Foundation for Telemetering, 1998. http://hdl.handle.net/10150/607352.

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International Telemetering Conference Proceedings / October 26-29, 1998 / Town & Country Resort Hotel and Convention Center, San Diego, California<br>High explosive radio telemetry (HERT) is a project that is being developed jointly by Los Alamos National Laboratory and AlliedSignal FM&T. The ultimate goal is to develop a small, modular telemetry system capable of high-speed detection of explosive events, with an accuracy on the order of 10 nanoseconds. The reliable telemetry of this data, from a high-speed missile trajectory, is a very challenging opportunity. All captured data must be t

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13

Raspopoulos, Marios. "Radio propagation in frequency selective buildings." Thesis, University of Surrey, 2007. http://epubs.surrey.ac.uk/843209/.

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Predicting and improving Radio propagation conditions has been a major topic of research since wireless communications started to emerge. The aim is to increase signal coverage and reliability, meet the increased traffic demands and provide high quality signal to the higher levels of the OSI model. Moreover, the coexistence of various wireless networks in a wireless communication environment, operating on various frequency bands increases the need for a frequency selective solution for improving radio propagation conditions of the various networks. For this reason, this work proposes a novel w

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14

Karderinis, Sideris. "Spectroscopic studies of radio-frequency plasmas." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325952.

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15

Valenta, Václav. "Frequency synthesis for cognitive multi-radio." Phd thesis, Université Paris-Est, 2010. http://tel.archives-ouvertes.fr/tel-00597461.

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This doctoral thesis deals with design aspects of a reconfigurable frequency synthesizer for flexible radio transceivers in future cognitive multi-radios. The frequency bandwidth to be covered by this multi-radio synthesizer corresponds to the frequency bands of the most diffused wireless communication standards in the frequency band 800 MHz to 6 GHz. Since multi-standard operation is required, the synthesizer must fulfil the most stringent and sometimes conflicting requirements. Given these requirements, a novel approach for multi-mode frequency synthesis has been conceived. A hybrid phase lo

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16

Mazal, Mohammed Jellop. "Optically scanned radio frequency field imaging." Thesis, King's College London (University of London), 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266654.

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17

Madic, Jelena 1977. "Security Sphere : radio frequency subsampling receiver." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/87251.

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Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, June 2002.<br>Includes bibliographical references (p. 85-86).<br>by Jelena Madic.<br>M.Eng.

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18

Rivas, Juan 1976. "Radio frequency dc-dc power conversion." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/38691.

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Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, February 2007.<br>Includes bibliographical references (p. 197-204).<br>THIS THESIS addresses the development of system architectures and circuit topologies for dc-dc power conversion at very high frequencies. The systems architectures that are developed are structured to overcome limitations associated with conventional designs. In particular, the new architectures described here structure the energy processing and control functions of the system in such a manner that high efficiency c

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19

Luschas, Susan 1975. "Radio frequency digital to analog converter." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/28277.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2003.<br>Includes bibliographical references (p. 124-126).<br>Dynamic performance of high speed, high resolution digital-to-analog converters (DACs) is limited by distortion at the data switching instants. Inter-symbol interference (ISI), imperfect timing synchronization and clock jitter are all culprits. A DAC output current controlled by an oscillating waveform is proposed to mitigate the effects of the switching distortion. The oscillating waveform should be a multiple (k*fs) of the

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20

Mohd, Yusof Yuslinda. "Miniature magneto-inductive radio frequency sensors." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.615702.

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21

Neophytou, Regas Ioanni. "Modelling of radio frequency heating systems." Thesis, University of Cambridge, 1998. https://www.repository.cam.ac.uk/handle/1810/272305.

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22

Sihlangu, Isaac. "The MeerKAT Radio Frequency Interference Environment." Master's thesis, Faculty of Science, 2019. https://hdl.handle.net/11427/31748.

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Radio signals from astronomical sources are extremely weak and easily distorted/- corrupted or overwhelmed by man-made radio signals such as cellphones, satellites, aircraft and telescope electronics. These Radio Frequency Interference (RFI) are increasingly threatening radio observatories due to our increasingly technological world. To detect and mitigate RFI, observatories need to understand their RFI environment, what contributes to it and how it is changing. While there are few dedicated RFI monitoring systems on the MeerKAT site, the most sensitive RFI detector is the MeerKAT array itself

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23

Jagoo, Mohammud Zafrullah. "Radio-frequency Heating of Magnetic Nanoparticles." Wright State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=wright1334849224.

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24

Venkatesh, Prabhu. "Radio frequency-based data collection network." Master's thesis, This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-01262010-020232/.

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25

Mirowski, L. "Detecting Clone Radio Frequency Identification Tags." Thesis, Honours thesis, University of Tasmania, 2006. https://eprints.utas.edu.au/792/1/Detecting_Clone_Radio_Frequency_Identification_Tags.pdf.

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The theft of Radio Frequency Identification (RFID) tag identity, commonly referred to as tag cloning, is a serious threat to RFID systems. It can enable an attacker to gain access to a secure facility, make fraudulent purchases, or disrupt supply chains. It may even enable crimes like financial gain, people smuggling, and drug trafficking, terrorism and money laundering. Presently there is no practical solution to defend against tag cloning. This thesis details research that aims to detect the presence of clone tags which may be the first step in defending against them and preventing RFID-

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26

Murji, Rizwan Deen M. Jamal. "Low-power CMOS radio frequency integrated circuits for frequency synthesis /." *McMaster only, 2005.

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27

Gendron, Paul John. "A comparison of digital beacon receiver frequency estimators." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-09292009-020307/.

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28

Atefi, A. "An investigation of radio wave propagation in mobile radio frequency bands." Thesis, University of Liverpool, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.354537.

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29

Kim, Hyung Joon. "Multi-standard radio transceiver architectures and radio frequency front-end design." Connect to this title online, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1110399471.

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Thesis (Ph. D.)--Ohio State University, 2005.<br>Title from first page of PDF file. Document formatted into pages; contains xv, 128 p.; also includes graphics (some col.). Includes bibliographical references (p. 125-128). Available online via OhioLINK's ETD Center

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30

Appler, Jason A. Finney Sean M. McMellon Michael A. "Aerial remote radio frequency identification system for small vessel monitoring." Monterey, California : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/MBAPR/2009/Dec/09Dec%5FAppler%5FMBA.pdf.

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"Submitted in partial fulfillment of the requirements for the degree of Master of Business Administration from the Naval Postgraduate School, December 2009."<br>Advisor(s): Dew, Nicholas ; Hudgens, Bryan. "December 2009." "MBA Professional report"--Cover. Description based on title screen as viewed on January 26, 2010. Author(s) subject terms: RFID, Radio Frequency Identification, airborne, vessel monitoring. Includes bibliographical references (p. 103-110). Also available in print.

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31

Jereb, Alexander Robert. "Design and implementation of a Radio-Frequency detection algorithm for use within A Radio-Frequency System on Chip." University of Dayton / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1608145466947488.

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32

Wiles, Andrew Donald. "Modelling Framework for Radio Frequency Spatial Measurement." Thesis, University of Waterloo, 2006. http://hdl.handle.net/10012/771.

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The main crux of this thesis was to produce a model that was capable of simulating the theoretical performance of different configurations for a spatial measurement system using radio frequency technology. It has been important to study new modalities of spatial measurement since spatial measurement systems are an enabling technology that have allowed for the creation of better medical procedures and techniques, provided valuable data for motion capture in animation and biomechanics, and have improved the quality of manufacturing processes in many industries. However, there has been room f

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33

Alexander, Paul. "Multi-frequency studies of powerful radio sources." Thesis, University of Cambridge, 1986. https://www.repository.cam.ac.uk/handle/1810/265339.

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This thesis is concerned with the physics of extragalactic radio - sources. Radio observations of a given source provide a powerful method with which to make direct measurements of the physical processes occuring within the la~ge-scale radio lobes and hotspots . Multi-frequency observations with up to five frequencies have been made for a number of ~ources using the Cambridge 5-km telescope and the Very Large Array. These data have been used to determine the change in radio spectra across the source . to obtain information about the way in which the electron population has evolved. Combining t

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34

Rockliff, Simon C. "Frequency hopping techniques for digital mobile radio /." Title page, contents and abstract only, 1990. http://web4.library.adelaide.edu.au/theses/09PH/09phr683.pdf.

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35

Chen, Xi. "Sequential Monte Carlo radio-frequency tomographic tracking." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=104844.

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Target tracking in over a small-scale area using wireless sensor networks (WSNs) is a technique that can be used in applications ranging from emergency rescue after an earthquake to security protection in a building. Many target tracking systems rely on the presence of an electric device which must be carried by the target in order to reports back its location and status. This makes these systems unsuitable for many emergency applications; in such applications device-free tracking systems that where no devices are attached to the targets are needed. Radio-Frequency (RF) tomographic tracking is

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36

Davis, Stephen. "Radio frequency tagging in the retail industry." Thesis, University of the West of England, Bristol, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262824.

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37

Laufer, Deanna (Deanna Raquel). "Radio Frequency Identification : regulating information privacy protection." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/41767.

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Thesis (S.M.)--Massachusetts Institute of Technology, Engineering Systems Division, Technology and Policy Program, 2007.<br>Includes bibliographical references (p. 82-87).<br>As applications of Radio Frequency Identification (RFID) become more profuse, the technology itself is stirring up some controversy. Due to its potential for amassing large amounts of information about both people and things, and the possibility of using the information for marketing, tracking, or even spying, numerous consumer groups are spearheading efforts to ensure that RFID does not breach their privacy rights. While

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38

Forbess, Jessica (Jessica Anne) 1975. "Medium frequency radio propagation in urban settings." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/86471.

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39

Barton, Taylor Wallis. "Phase manipulation for efficient radio frequency transmission." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/78474.

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Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2012.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 109-112).<br>Power amplifiers (PAs) for microwave communications are generally the most power-hungry element of a transmitter. High linearity is required for modern digital communications standards, and often is achieved at the expense of efficiency. Outphasing architectures, which combine multiple nonlinear but efficient switching PAs into a system with an overall linear response, represent a pro

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40

Nation, Joshua C. (Joshua Caleb). "Fabrication of chip-scale radio frequency inductors." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/92067.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2014.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (pages 101-104).<br>The purpose of this research was to learn the relationship between force and deformation in forming of micro-scale inductor coils. This was accomplished by applying large-deflection beam bending to the case of planar wire deformation a

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41

Foley, Joseph Timothy 1976. "Security approaches for Radio Frequency Identification systems." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/38710.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2007.<br>Includes bibliographical references (p. 253-270) and index.<br>In this thesis, I explore the challenges related to the security of the Electronic Product Code (EPC) class of Radio Frequency Identification (RFID) tags and associated data. RFID systems can be used to improve supply chain performance and automate asset management. However, an antagonist could use the functionality of the RFID tags and the EPC data to invade personal privacy or acquire access to unauthorized corporate information such a

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42

Liney, David John. "Radio frequency properties of high Tc superconductors." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624839.

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43

Gurr, J. Richard, Anthony Auvil, and Jim Rizzo. "WIDE-BAND RADIO FREQUENCY (RF) SOURCE SURVEILLANCE." International Foundation for Telemetering, 1998. http://hdl.handle.net/10150/607394.

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International Telemetering Conference Proceedings / October 26-29, 1998 / Town & Country Resort Hotel and Convention Center, San Diego, California<br>Reduction in available radio frequency (RF) spectrum for use in aircraft testing has steadily increased the probability of interference. The increase in users and required bandwidth generates requirements for increased monitoring and active management of the RF spectrum. The detection of background RF emissions and monitoring of authorized users will be used by future range test engineers to make decisions on when and where to conduct test m

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44

Tegkelidis, Christos, and Erik Lindström. "Modeling of Radio Frequency Heating in JET." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-293886.

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This study examines the efficiency of ion cyclotronresonance heating in multi-ion plasmas in JET (Joint EuropeanTorus), using deuterium and tritium as fuel along with smallconcentrations of a third ion species. In particular, two ionminority scenarios, hydrogen and helium, as well as a 3-ionscenario using beryllium were constructed. The scenarios weresimulated with FEMIC and the obtained data was then compiledand analyzed through a number of metrics.The highest total power absorption was 8.56 W and wasachieved by the 4% hydrogen scenario. However, 8% hydrogenattained the highest power partitio

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45

ABASCAL, CARLOS G. "ADAPTIVE EQUALIZATION OF A RADIO FREQUENCY AMPLIFIER." University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin983391684.

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46

Pan, Kuan-Chang. "Vanadium Dioxide Based Radio Frequency Tunable Devices." University of Dayton / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=dayton154341840843132.

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47

Harrison, Kyle. "Machine Learning for Radio Frequency Interference Flagging." Master's thesis, Faculty of Engineering and the Built Environment, 2021. http://hdl.handle.net/11427/33777.

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The field of radio frequency interference (RFI) flagging involves the identification of corrupted data within radio astronomy measurements. This work explores the application of supervised machine learning algorithms for RFI flagging, trained on real measurement data and simulated data with simulated RFI. The goal of this work is to investigate the prediction of RFI using specific machine learning algorithms; Naive Bayes Classifier, K-Nearest Neighbours Classifier, Random Forest Classifier, the U-Net convolution neural network and the Multilayer Perceptron. These algorithms are trained on real

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48

Sivarajan, Kumar N. McEliece Robert J. McEliece Robert J. "Spectrum efficient frequency assignment for cellular radio /." Diss., Pasadena, Calif. : California Institute of Technology, 1990. http://resolver.caltech.edu/CaltechETD:etd-11082007-105043.

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49

Kim, David Storm. "Hybrid free-space and radio frequency switching." College Park, Md.: University of Maryland, 2008. http://hdl.handle.net/1903/8913.

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Thesis (M.S.) -- University of Maryland, College Park, 2008.<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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50

Liu, Xiaojian. "Radio frequency evaluation of oriented strand board." Diss., Mississippi State : Mississippi State University, 2008. http://library.msstate.edu/etd/show.asp?etd=etd-07082008-145942.

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