Rozprawy doktorskie na temat „Frequency”
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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.
Pełny tekst źródłaWalker, 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.
Pełny tekst źródłaThesis 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.
Luna, Lauro. "Frequency mapping for the operational frequency manager". Thesis, Monterey, California. Naval Postgraduate School, 2008. http://hdl.handle.net/10945/4231.
Pełny tekst źródłaWong, 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.
Pełny tekst źródłaMai, Cuong. "Frequency Estimation Using Time-Frequency Based Methods". ScholarWorks@UNO, 2007. http://scholarworks.uno.edu/td/571.
Pełny tekst źródłaCeylan, 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.
Pełny tekst źródła"December 1999". Thesis advisor(s): D. Curtis Schleher. Includes bibliographical references (p. 129-130). Also available online.
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.
Pełny tekst źródłaRohani-Mehdiabadi, Bijan. "Frequency discriminator detection in frequency-selective fading environments". Thesis, Curtin University, 1998. http://hdl.handle.net/20.500.11937/451.
Pełny tekst źródłaRohani-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.
Pełny tekst źródłasuppressed by the use of inverse-limiting in conjunction with frequency discriminator detection. As a result, an effective adaptive detection scheme has been formulated, based on modelling the combination of the GMSK modulator, the mobile channel, the frequency discriminator, and any transmit and receive fitters, as a finite-state machine. The transmitted data is then detected using an MLSE. The BER performance of this proposed adaptive detection scheme has been extensively investigated by computer simulation. This has been carried out assuming various propagation conditions, including the two-ray fading channel model with equal path powers and relative delays of up to four bit periods, the maximum relative delay considered in the GSM system. Also, the effectiveness of the proposed adaptive detection scheme in combatting IS] has been investigated by computer simulation based on the six-ray GSM empirical propagation models for typical urban (TU), hilly terrain (HT) and rural area (RA) environments. The computer simulated results confirm that the voice grade performance required for the GSM system could be achieved by the proposed adaptive detection scheme in all the recommended GSM propagation models considered. Furthermore, the BER performance of the receiver remains unaffected by a carrier frequency offset of up to 2 kHz.
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/.
Pełny tekst źródłaChallakere, Nagaravind. "Carrier Frequency Offset Estimation for Orthogonal Frequency Division Multiplexing". DigitalCommons@USU, 2012. https://digitalcommons.usu.edu/etd/1423.
Pełny tekst źródłaAbdoush, Yazan <1989>. "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.
Pełny tekst źródłaCooperrider, Jason R. "Interactions between word frequency and neighborhood frequency in lexical access". Connect to resource, 2007. http://hdl.handle.net/1811/28449.
Pełny tekst źródłaTitle 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.
Murji, Rizwan Deen M. Jamal. "Low-power CMOS radio frequency integrated circuits for frequency synthesis /". *McMaster only, 2005.
Znajdź pełny tekst źródłaHolman, 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.
Pełny tekst źródłaŽitkevičius, 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.
Pełny tekst źródłaŽmogaus galvos KT bei MR vaizdus analizuoja apmokyti diagnostikos specialistai – radiologai. Vaizdai, kuriuos turi analizuoti radiologas, yra pilkieji vaizdai, pateikiami monitoriuje arba skaidrėse. Juose tiriami objektai yra atpažįstami pagal tam tikrų vaizdo sričių pilkumo lygį, išsidėstymą, formą, dydį ir kitus požymius. Atpažinimo procesui turi įtakos eilė veiksnių, kurių visuma lemia diagnostines neapibrėžtis. Jų sumažinimui bei diagnostikos paspartinimui vis plačiau taikoma pagalbinė kompiuterinė programinė įranga, kuri, be to, suteikia daug papildomų trimačio vizualizavimo ir skaičiavimo galimybių. Šio darbo tikslas yra ištirti medicininių vaizdų analizės ir apdorojimo galimybes, taikant dažninius ir erdvinius dažninius spektrus, bei sudaryti algoritmus, skirtus ligų sričių ar kitų specifinių vaizdo sričių segmentavimui.
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.
Pełny tekst źródłaVeerakitti, 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.
Pełny tekst źródłaMoghaddar, 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.
Pełny tekst źródłaHeuschel, 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.
Pełny tekst źródłaKoski, Antti E. "Rapid frequency estimation". Worcester, Mass. : Worcester Polytechnic Institute, 2006. http://www.wpi.edu/Pubs/ETD/Available/etd-032806-165036/.
Pełny tekst źródłaKeywords: DSS; ECM; SVD; Singular Value Decomposition; rapid frequency estimation; frequency estimation. Includes bibliographical references (leaves 174-177).
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.
Pełny tekst źródłaTorres, Wade Patrick. "Generalized frequency modulation". Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8697.
Pełny tekst źródłaIncludes bibliographical references (p. 127-128).
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 proportion to an information signal. The rate-modulated carrier wave is a scalar function of the state variables of the modulator. The thesis is focused on three aspects of rate modulation and demodulation systems. First, explicit expressions are derived for the power density spectrum of the rate modulated carrier wave for sinusoidal modulation. Second, a systematic procedure is derived for constructing demodulators. This procedure requires that the dynamical system used in the modulator has a known exponentially convergent observer. Assuming such an observer is known, a systematic procedure for constructing demodulators is given that depends on the underlying dynamical system in a simple manner. Finally, the quasi-moment neglect closure technique is used to approximate the signal-to-noise ratio when the carrier wave is corrupted by additive white-noise.
by Wade P. Torres.
Ph.D.
Minns, Alan Ronald. "Low frequency variability". Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624871.
Pełny tekst źródłaGeldenhuys, N. D. "Microwave frequency discriminators". Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52337.
Pełny tekst źródłaENGLISH 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.
AFRIKAANSE OPSOMMING: Hierdie is 'n inleiding tot die onderwerp van mikrogolf frekwensie diskrimineerders. Verskeie toepassings en implementeringstegnieke van hierdie toestelle word genoem en bespreek. Hierdie tesis kan dien as verwysings-raamwerk vir toekomstige navorsing oor hierdie onderwerp. Diskrimineerders is ontwikkel by beide S- en X-band, met 'n goeie lineariteit en sensitiwiteit. Die stelsels wat gebruik word om hulle te implementeer, is ook ontwikkel. Die S-band diskrimineerder is gebruik in 'n direkte FM demodulasie sisteem en werk goed.
Coates, Mark J. "Time frequency modelling". Thesis, University of Cambridge, 1999. https://www.repository.cam.ac.uk/handle/1810/272036.
Pełny tekst źródłaGanesan, Adarsh. "Phononic frequency combs". Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/274878.
Pełny tekst źródłaGaucher, Yann. "Odd-Frequency Pairing". Thesis, Uppsala universitet, Materialteori, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-401811.
Pełny tekst źródłaMazzer, Eva <1996>. "HIGH FREQUENCY TRADING". Master's Degree Thesis, Università Ca' Foscari Venezia, 2021. http://hdl.handle.net/10579/19441.
Pełny tekst źródłaMarian, 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.
Pełny tekst źródłaCai, Kun, i 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.
Pełny tekst źródłaLi, 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.
Pełny tekst źródłaFeng, 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.
Pełny tekst źródłaIncludes bibliographical references (leaves 75-78).
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 frequency signals up to the 70MHz band to achieve up to 28dB attenuation and 60-86MHz variable filtering. A Single Side Band system has a Signal-to-Noise Ratio (SNR) of 71dB with a 73dB SNR Analog-to-Digital Converter (ADC), 44 dB Output Third-Order Intercept Point (OIP3), and a Noise Figure (NF) of 14dB. Ultrasound and other applications in the 1-10MHz range benefit greatly from this upconversion scheme.
by Mabel Y. Feng.
M.Eng.
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.
Pełny tekst źródłaElayouty, 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/.
Pełny tekst źródłaIsmael, 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.
Pełny tekst źródłaAbdulhamed, 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.
Pełny tekst źródłaCai, 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.
Pełny tekst źródłaPei, Zhengyang. "Load Frequency Control Design for Improving Frequency Quality of Power Systems". Thesis, The University of Sydney, 2019. https://hdl.handle.net/2123/21979.
Pełny tekst źródłaJones, Graeme Stephen. "Instantaneous frequency, time-frequency distributions and the analysis of multicomponent signals". Thesis, Queensland University of Technology, 1992.
Znajdź pełny tekst źródłaHill, Martin T. "New techniques for measurement and tracking of phase and frequency". Thesis, Curtin University, 1997. http://hdl.handle.net/20.500.11937/1923.
Pełny tekst źródłaGeladakis, 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.
Pełny tekst źródła"December 1996." Thesis advisor(s): Gurnam S. Gill. Includes bibliographical references (p. 45). Also available online.
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.
Pełny tekst źródłaElias, 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.
Pełny tekst źródłaLedingham, 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.
Pełny tekst źródłaZiai, 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.
Pełny tekst źródłaBozic, 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.
Pełny tekst źródłaMARTINEZ, 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.
Pełny tekst źródłaCOORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
PROGRAMA DE EXCELENCIA ACADEMICA
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 elétricos mais adequadamente, melhorando assim as condições de análise. Neste trabalho são apresentadas três modelagens do fluxo de carga mais completas que a modelagem clássica, a saber: a modelagem de múltiplas barras swing, a modelagem com regulação primária e a modelagem com parâmetros da rede de transmissão variáveis com a frequência. Uma vez utilizadas na solução do problema do fluxo de carga estas modelagens são estendidas para a realização do cálculo dos índices de estabilidade de tensão das barras de carga, barras de tensão controlada e barras swing. Testes numéricos com um sistema-teste de 6 barras são apresentados para a verificação da aplicabilidade e adequação dos modelos analisados.
The growing demand for electricity increases the complexity of electric power systems which, when combined with limitations in the expansion of transmission systems, results in the operation of electrical systems closer to their limits, making them vulnerable to voltage stability problems. In this context, there is a gap in the market for the development of computational tools that can represent the electrical systems more appropriately, thereby improving the conditions of analysis. The present study formulates three non-classical load flow representations: multiple swing buses, primary frequency control, and frequency dependent transmission network parameters. Once used in the load flow problem solving, these models are also extended to allow the calculation of voltage stability indices of load buses, controlled voltage buses and swing buses. Numerical tests with a 6-bus test system are presented to verify the applicability and adequacy of the proposed models.
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.
Pełny tekst źródłaIncludes bibliographical references (leaves 77-79).
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 item, the materials in the item, and the item's surrounding environment. The majority of existing commercial tag antennas are two-dimensional making the tags a) orientation-sensitive, working well in some directions and not at all in others, and b) susceptible to communication interference from the contents of the tagged object. The Albano antenna designs are three-dimensional, affording the tags to be minimally affected by object material while maintaining near omnidirectional performance. The Albano antenna designs provide significantly improved orientation insensitivity compared with existing widely deployed commercial tag antenna designs.
by Stefanie Alkistis Delichatsios.
M.Eng.
Jung, Chang won, Ming-jer Lee, Sunan Liu, G. P. Li i 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.
Pełny tekst źródłaReconfigurable 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 attached to the edge of the patch acts as the perturbation to produce the circular polarization. Gain of proposed antenna is 5 - 6dBi, and axial ratio satisfies 3dB criterion at both operating frequencies. The switches are monolithically integrated on quartz substrate. The antenna can be used in applications requiring frequency diversity of remarkable high frequency ratio.