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Dissertations / Theses on the topic 'Frequency'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 July 2025

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1

Saarinen, Linn. "The Frequency of the Frequency : On Hydropower and Grid Frequency Control." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-308441.

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Variations in the electricity consumption and production connected to the power system have to be balanced by active control. Hydropower is the most important balancing resource in the Nordic system, and will become even more important as the share of variable renewable energy sources increases. This thesis concerns balancing of active power, especially the real-time balancing called frequency control. The thesis starts in a description of the situation today, setting up models for the behaviour of hydropower units and the power system relevant to frequency control, and comparing the models wi
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2

Walker, Scott A. Luna Lauro. "Frequency mapping for the operational frequency manager." Monterey, Calif. : Naval Postgraduate School, 2008. http://bosun.nps.edu/uhtbin/hyperion-image.exe/08Mar%5FWalker%5FScott.pdf.

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Thesis (M.S. in Information Technology Management)--Naval Postgraduate School, March 2008.<br>Thesis Advisor(s): Bordetsky, Alex ; Bourakov, Eugene. "March 2008." Description based on title screen as viewed on May 1, 2008. Includes bibliographical references (p. 119). Also available in print.
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3

Luna, Lauro. "Frequency mapping for the operational frequency manager." Thesis, Monterey, California. Naval Postgraduate School, 2008. http://hdl.handle.net/10945/4231.

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The Department of Defense (DOD) has placed great emphasis on the networking and connectivity of forces over the last several years. Programs include the Global Information Grid (GIG), Force Net, and Net Centric Warfare to name a few. These programs emphasize and stress the warfighter's need to stay connected to their appropriate operational command and control structure during operations. The value of this connectivity is crucial to both the individual warfighter and the command structure as a force multiplier in modern warfare. One solution to this problem of connectivity is giving our operat
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4

Wong, S. W. "Frequency hopping data transmission at high frequency." Thesis, University of Manchester, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317262.

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5

Mai, Cuong. "Frequency Estimation Using Time-Frequency Based Methods." ScholarWorks@UNO, 2007. http://scholarworks.uno.edu/td/571.

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Any periodic signal can be decomposed into a sum of oscillating functions. Traditionally, cosine and sine segments have been used to represent a single period of the periodic signal (Fourier Series). In more general cases, each of these functions can be represented by a set of spectral parameters such as its amplitude, frequency, phase, and the variability of its instantaneous spectral components. The accuracy of these parameters depends on several processing variables such as resolution, noise level, and bias of the algorithm used. This thesis presents some background of existing freque
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6

Ceylan, Oktay. "Resolving frequency ambiguities in step : frequency compressive receivers." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1999. http://handle.dtic.mil/100.2/ADA374376.

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Thesis (M.S. in Systems Engineering) Naval Postgraduate School, December 1999.<br>"December 1999". Thesis advisor(s): D. Curtis Schleher. Includes bibliographical references (p. 129-130). Also available online.
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7

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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8

Rohani-Mehdiabadi, Bijan. "Frequency discriminator detection in frequency-selective fading environments." Thesis, Curtin University, 1998. http://hdl.handle.net/20.500.11937/451.

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In recent years, millions of customers all over the world have been subscribing to mobile telephony services which are based on modern digital transmission. At the high transmission bit rates that these systems use, the mobile radio channel exhibits frequency-selective fading characteristics. Under such conditions, the received signal could experience significant intersymbol interference (ISI) from severe distortion to the waveform of the received baseband signal. Therefore, such techniques as adaptive waveform equalisation or adaptive maximum likelihood sequence estimation (MLSE) are used in
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9

Rohani-Mehdiabadi, Bijan. "Frequency discriminator detection in frequency-selective fading environments." Curtin University of Technology, School of Electrical and Computer Engineering, 1998. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=12148.

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In recent years, millions of customers all over the world have been subscribing to mobile telephony services which are based on modern digital transmission. At the high transmission bit rates that these systems use, the mobile radio channel exhibits frequency-selective fading characteristics. Under such conditions, the received signal could experience significant intersymbol interference (ISI) from severe distortion to the waveform of the received baseband signal. Therefore, such techniques as adaptive waveform equalisation or adaptive maximum likelihood sequence estimation (MLSE) are used in
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10

Borda, Fortuny C. "New frequency reconfigurable antennas for wide frequency range tuning." Thesis, University College London (University of London), 2017. http://discovery.ucl.ac.uk/1544686/.

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Frequency reconfigurable antennas are becoming a compelling solution for the increasing demand of higher antenna capabilities, since they can operate at tunable narrow frequency bands while rejecting the undesirable signals from other bands. The aim of this project is to develop new designs for frequency reconfigurable antennas that can work across a wide frequency range (from 1 GHz up to 6 GHz) while maintaining stable radiation pattern and polarisation as required by the industry sponsors. A Vivaldi antenna is considered as the basis for a frequency reconfigurable design as it maintains the
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11

Challakere, Nagaravind. "Carrier Frequency Offset Estimation for Orthogonal Frequency Division Multiplexing." DigitalCommons@USU, 2012. https://digitalcommons.usu.edu/etd/1423.

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This thesis presents a novel method to solve the problem of estimating the carrier frequency set in an Orthogonal Frequency Division Multiplexing (OFDM) system. The approach is based on the minimization of the probability of symbol error. Hence, this approach is called the Minimum Symbol Error Rate (MSER) approach. An existing approach based on Maximum Likelihood (ML) is chosen to benchmark the performance of the MSER-based algorithm. The MSER approach is computationally intensive. The thesis evaluates the approximations that can be made to the MSER-based objective function to make the computa
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12

Abdoush, Yazan <1989&gt. "Time-Frequency Signal Analysis and Adaptive Instantaneous Frequency Estimation." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amsdottorato.unibo.it/9079/1/Thesis.pdf.

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Most of the human-made and physical signals have nonstationary spectra that evolve rapidly with time. To study and characterize such signals, the classic time-domain and frequency-domain representations are inadequate, since they do not provide joint time and frequency information; meaning that, they are signal representations in which the time and frequency variables are mutually exclusive. Time-frequency (TF) signal analysis (TFSA) concerns the processing of signals with time-varying spectral content. It allows for the construction of a signal representation in which the time and frequency v
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13

Cooperrider, Jason R. "Interactions between word frequency and neighborhood frequency in lexical access." Connect to resource, 2007. http://hdl.handle.net/1811/28449.

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Thesis (Honors)--Ohio State University, 2007.<br>Title from first page of PDF file. Document formatted into pages: contains 25 p. Includes bibliographical references (p. 15). Available online via Ohio State University's Knowledge Bank.
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14

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

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15

Holman, Kevin W. "Distribution of an ultrastable frequency reference using optical frequency combs." Diss., Connect to online resource, 2005. http://wwwlib.umi.com/cr/colorado/fullcit?p3190346.

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16

Žitkevičius, Evaras. "Analysis of medical images in frequency and space-frequency domains." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2007. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2007~D_20071204_102356-91944.

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Images of CT and MRI are grayscale images and usually they are analyzed by radiologists on display either on transparency screen. Then objects in images are recognized by their properties like average luminosity of the region, localization, shape, dimensions, etc. The process of visual recognition is affected by many factors. The totality of factors determines uncertainties of diagnostics. More and more often there are used software utilities in the analysis of images which help to lower the uncertainties and speed up the analysis time. The aim of the work is investigation of medical image pro
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17

Khumsat, Phanumas. "Transition frequency integration : technique for high frequency continuous-time filters." Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398200.

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18

Veerakitti, Paesol. "High Frequency VCO and Frequency Divider in VLSI 90nm Technology." Wright State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=wright1278426944.

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19

Moghaddar, Ali. "Time-frequency representation of frequency-dispersive waveguide and cavity scatterers /." The Ohio State University, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487859879939625.

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20

Heuschel, Eugene R. "Time-frequency, bi-frequency detector analysis of noise technology radar." Thesis, Monterey, California. Naval Postgraduate School, 2006. http://hdl.handle.net/10945/2636.

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Enemy integrated air defense systems (IADS) using low probability of intercept (LPI) emitters can cause significant problems for suppression of enemy air defense (SEAD) techniques. New threat emitter configurations using low-power random noise modulation have a significant processing gain unavailable to non-cooperative intercept receivers. Consequently, the detection of these emitters can not be accomplished with conventional intercept receiver detection methods. This thesis examines the use of time-frequency, bi-frequency signal detection techniques to identify the parameters of the fou
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21

Koski, Antti E. "Rapid frequency estimation." Worcester, Mass. : Worcester Polytechnic Institute, 2006. http://www.wpi.edu/Pubs/ETD/Available/etd-032806-165036/.

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Thesis (M.S.)--Worcester Polytechnic Institute.<br>Keywords: DSS; ECM; SVD; Singular Value Decomposition; rapid frequency estimation; frequency estimation. Includes bibliographical references (leaves 174-177).
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22

Karim, Omair. "Electronic frequency controller." Thesis, Blekinge Tekniska Högskola, Institutionen för tillämpad signalbehandling, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-690.

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The project was performed with universal electronics which is based in Karachi Pakistan at PRD Lab. Due to the energy crises the industry is switching to alternative power generators. The main issue with the maintenance of the generator is the constant failure of the controller which has to be imported ,the purpose of this project is to make a cheap efficient Electronic Frequency Controller (EFC) that can be used in almost all kinds of generators. The work was tested on Multisim and then soldered together. To make it functional the frequency generation was converted to voltage which was connec
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23

Torres, Wade Patrick. "Generalized frequency modulation." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8697.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.<br>Includes bibliographical references (p. 127-128).<br>In frequency modulation (FM) systems, a continuous-time information signal is modulated onto a sinusoidal carrier wave by using the information signal to modulate the frequency of the carrier wave. In this thesis, a more general type of modulation is developed, of which FM is a special case, that we refer to as rate modulation. A rate modulation system consists of a dynamical system whose rate of evolution is varied in propo
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24

Minns, Alan Ronald. "Low frequency variability." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624871.

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25

Geldenhuys, N. D. "Microwave frequency discriminators." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52337.

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Thesis (MScEng)--University of Stellenbosch, 2001.<br>ENGLISH ABSTRACT: The topic of microwave frequency discriminators is introduced. Various applications and implementation techniques of these devices are given and discussed. This thesis may serve as reference foundation for future research on this topic. Discriminators are developed at both S- and X-band, with high linearity and good sensitivity. The systems used to implement these devices are developed as well. The S-band discriminator is used in a direct FM demodulation system, which works well.<br>AFRIKAANSE OPSOMMING: Hierdie i
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26

Coates, Mark J. "Time frequency modelling." Thesis, University of Cambridge, 1999. https://www.repository.cam.ac.uk/handle/1810/272036.

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27

Ganesan, Adarsh. "Phononic frequency combs." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/274878.

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Optical frequency combs have resulted in significant advances in optical frequency metrology and found wide application to precise physical measurements and molecular fingerprinting. A direct analogue of frequency combs in the phononic or acoustic domain has not been reported to date. This thesis describes a series of results to provide the first clear evidence for the generation of phononic frequency combs in the domain of micromechanical resonators. These results are supported by a theoretical framework which was originally developed to predict the existence of such features of combs in phys
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28

Gaucher, Yann. "Odd-Frequency Pairing." Thesis, Uppsala universitet, Materialteori, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-401811.

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29

Mazzer, Eva <1996&gt. "HIGH FREQUENCY TRADING." Master's Degree Thesis, Università Ca' Foscari Venezia, 2021. http://hdl.handle.net/10579/19441.

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This paper is going to discuss the role of High Frequency Trading (HTF) in financial market and whether it helps the economy or if it is obstructing other agents in the market. HFT is a subset of the algorithmic trading (‘AT’) distinguished by the speed at which it processes and determines plays in the market. This is due to the sophisticated technology components that are reducing the latency, the time occurring between when the order is placed and when it is executed. The analysis starts from current knowledge of HFT and why its introduction was so revolutionary in the way trading is done to
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30

Marian, Adela Ye Jun. "Direct frequency comb spectroscopy for optical frequency metrology and coherent interactions." Diss., Connect to online resource, 2005. http://wwwlib.umi.com/dissertations/fullcit/3186934.

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31

Cai, Kun, and 蔡琨. "Bayesian carrier frequency offset estimation in orthogonal frequency division multiplexing systems." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B42841367.

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32

Li, Jie. "High frequency power transformer modelling for frequency response analysis (FRA) diagnosis." Thesis, University of Manchester, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.538489.

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Transformer fault diagnosis through Frequency Response Analysis (FRA) has been receiving a great deal of attention in recent years. As a comparative technique, FRA has good capability and sensitivity in detecting mechanical faults that are difficult to identify by conventional condition assessment techniques. Power transformers are among the most expensive equipment owned by electric utilities, and it is not reasonable to produce deformation on actual transformers and carry out measurement sensitivity studies. On the other hand, simulation models, which can accurately reproduce transformer hig
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33

Feng, Mabel Y. "Frequency translation method for low frequency variable gain amplification and filtering." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/41642.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2007.<br>Includes bibliographical references (leaves 75-78).<br>This thesis discusses an innovative solution to an industry challenge. A frequency translation method is designed to shift low frequency signals to intermediate frequencies in order to utilize higher-frequency components. This solution, appropriate for applications involving 1-10MHz signals, can provide continuously variable gain and filtering at little cost in dynamic performance. The working system converts the low freq
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34

Gul, Malik Muhammad Usman. "Timing and frequency synchronization for orthogonal frequency division multiple-access systems." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/52328.

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Reliable timing and frequency synchronization is a major requirement in orthogonal frequency division multiple-access (OFDMA) systems as synchronization errors can result in inter-symbol-interference (ISI) and inter-carrier-interference (ICI) in the received signal, which severely degrade system performance. Thus, the objective of the proposed research is to develop, analyze, and prototype timing and frequency synchronization techniques for downlink (DL) and uplink (UL) OFDMA transmissions. For synchronization in DL OFDMA transmissions, we have developed conditions to select appropriate Zadoff
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35

Elayouty, Amira Sherif Mohamed. "Time and frequency domain statistical methods for high-frequency time series." Thesis, University of Glasgow, 2017. http://theses.gla.ac.uk/8061/.

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Advances in sensor technology enable environmental monitoring programmes to record and store measurements at high-temporal resolution over long time periods. These large volumes of high-frequency data promote an increasingly comprehensive picture of many environmental processes that would not have been accessible in the past with monthly, fortnightly or even daily sampling. However, benefiting from these increasing amounts of high-frequency data presents various challenges in terms of data processing and statistical modeling using standard methods and software tools. These challenges are attri
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36

Ismael, Alexander. "Comparison of fast frequency reserve strategies for Nordic grid frequency stability." Thesis, Uppsala universitet, Institutionen för elektroteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-411503.

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How long would modern society cope with a power outage, what would happen to vital systems that we today take for granted in modern society. The Nordic electricity grid is facing a major shift where electricity production from non-renewable sources are to be replaced increasingly by renewable sources. By increasing the penetration of wind and solar power the electric power system might be exposed to disturbances due to decreasing inertia as a result of the electricity transition. Currently the electric power system has different reserves to use to maintain frequency stability but there are oth
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37

Abdulhamed, Bilal Khudhur Abdulhammed. "Digital Instantaneous Frequency Measurement Receiver for Fine Frequency and High Sensitivity." Wright State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=wright1559548084463134.

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38

Cai, Kun. "Bayesian carrier frequency offset estimation in orthogonal frequency division multiplexing systems." Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B42841367.

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39

Pei, Zhengyang. "Load Frequency Control Design for Improving Frequency Quality of Power Systems." Thesis, The University of Sydney, 2019. https://hdl.handle.net/2123/21979.

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Load frequency control (LFC) has been widely recognized as a feasible tool in power system frequency regulation. With the rapidly increasing scale of power grids and proportion of renewables in power systems, the frequency control has been potentially impaired because this occurrence may raise more power fluctuations and diminish power system inertia. In light of this, there is a necessity to accommodate the current frequency control methods to the emerging integrated power systems. Against this background, this thesis addresses the frequency control problems from two aspects: one of ameliorat
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40

Jones, Graeme Stephen. "Instantaneous frequency, time-frequency distributions and the analysis of multicomponent signals." Thesis, Queensland University of Technology, 1992.

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41

Hill, Martin T. "New techniques for measurement and tracking of phase and frequency." Thesis, Curtin University, 1997. http://hdl.handle.net/20.500.11937/1923.

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This thesis presents and analyses new techniques to measure and track the phase and frequency of high frequency narrow bandwidth signals. In particular, these techniques are all digital in nature or can be implemented in digital integrated circuit technology.Presented first is a frequency measurement technique which involves sampling at regular intervals a binary quantized narrow band signal. The binary quantized samples are digitally processed to obtain the instantaneous frequency of the signal.It is shown that small phase movements in the signal can be detected even though the sampling occur
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42

Geladakis, Dimitrios N. "Comparison of the step frequency radar with the conventional constant frequency radars." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA328272.

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Thesis (M.S. in Electrical Engineering) Naval Postgraduate School, December 1996.<br>"December 1996." Thesis advisor(s): Gurnam S. Gill. Includes bibliographical references (p. 45). Also available online.
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43

Xu, Yiwen. "Frequency analysis of low-frequency field fluctuations detected by the Cluster satellites." Thesis, KTH, Rymd- och plasmafysik, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-91547.

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44

Elias, Bartholomew. "Cross-modal facilitation of spatial frequency discriminations through auditory frequency cue presentations." Thesis, Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/28611.

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45

Ledingham, Jamie Andrew. "The estimation of flood frequency curves by mapping from rainfall frequency curves." Thesis, University of Newcastle Upon Tyne, 2011. http://hdl.handle.net/10443/1320.

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Recent large flooding events have reinforced the need for prudent flood risk management. The July 2007 floods in Yorkshire and the Midlands and the November 2009 floods in the Lake District have highlighted the current vulnerability of key infrastructure and the built environment in the UK to flooding. This existing flood risk is coupled with concerns over the potential impacts of future climate change on flood regimes. Therefore, there is a need to develop tools and methodologies to assess the potential impact of likely climate change on flood risk. The link between large rainfall and flow ev
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46

Ziai, Mohamad Ali. "Electrically thin and platform insensitive ultra high frequency radio frequency identification tags." Thesis, University of Kent, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.594196.

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The objective of this research is to design passive UHF RFID tags that are insensitive to the platform they are applied to. The tag antennas developed in this work will exhibit good read range in harsh electromagnetic environments, such as metallic objects, liquid containers and human skin, while balancing the tag unit cost and form factor with perfonnance. In the early part of this thesis a brief introduction to RFID, the essential antenna parameters, the physics of RFID and the environmental effects on tag antennas sets the background necessary for understanding the procedure used when desig
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Bozic, Milos. "Suppression techniques of unwanted spurious frequency components in direct digital frequency synthesis." Thesis, University of Bradford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385596.

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48

MARTINEZ, DIANA MARGARITA GARCIA. "VOLTAGE STABILITY ASSESSMENT CONSIDERING PRIMARY FREQUENCY CONTROL AND FREQUENCY-DEPENDENT LINE PARAMETERS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2015. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=25603@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>PROGRAMA DE EXCELENCIA ACADEMICA<br>A crescente demanda de energia elétrica faz com que a complexidade dos sistemas elétricos de potência seja cada vez maior, associado às limitações na expansão do sistema de transmissão, resulta na operação dos sistemas elétricos mais próximos de seus limites, tornando-os vulneráveis a problemas de estabilidade de tensão. Nesse contexto, faz-se necessário o desenvolvimento de ferramentas computacionais capazes de representar os sistemas elétri
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49

Delichatsios, Stefanie Alkistis. "Multi-dimensional ultra-high frequency passive radio frequency identification tag antenna designs." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/37050.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2006.<br>Includes bibliographical references (leaves 77-79).<br>In this thesis, we present the design, simulation, and empirical evaluation of two novel multi-dimensional ultra-high frequency (UHF) passive radio frequency identification (RFID) tag antennas, the Albano-Dipole antenna and the Albano-Patch antenna, that provide omnidirectional communication capabilities. The performance of a passive UHF RFID tag is highly dependent upon the tag's antenna design, the tag's placement on an
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50

Jung, Chang won, Ming-jer Lee, Sunan Liu, G. P. Li, and Flaviis Franco De. "RECONFIGURABLE PATCH ANTENNA FOR FREQUENCY DIVERSITY WITH HIGH FREQUENCY RATIO (1.6:1)." International Foundation for Telemetering, 2005. http://hdl.handle.net/10150/605028.

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ITC/USA 2005 Conference Proceedings / The Forty-First Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2005 / Riviera Hotel & Convention Center, Las Vegas, Nevada<br>Reconfigurable patch antenna integrated with RF mircoelectromechanical system (MEMS) switches is presented in this paper. The proposed antenna radiates circularly polarized wave at selectable dual frequencies (4.7 GHz and 7.5GHz) of high frequency ratio (1.6:1). The switches are incorporated into the diagonally-fed square patch for controlling the operation frequency, and a rectangular stub at
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