Дисертації з теми "THZ FREQUENCY"
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Parvex, Pichaida Taky. "Astrometric precision spectroscopy: Experimental development of a dual-frequency laser synthesizer based on an optical frequency comb." Tesis, Universidad de Chile, 2018. http://repositorio.uchile.cl/handle/2250/159288.
Повний текст джерелаLa tecnología de terahercios se encuentra en un estado de desarrollo atrasado con respecto a las tecnologías usadas en las bandas adyacentes, como la óptica infrarroja o la electróni- ca de microondas. En particular, no se poseen fuentes compactas de radiación que operen dentro esta banda logrando buenos niveles de potencia y amplios rangos de frecuencia. Las útiles propiedades de la radiación de terahercios como su capacidad de detectar moléculas complejas, buena resolución espacial y ser radiación no ionizante, hacen que el desarrollo de tecnología para esta banda sea un área con creciente interés. En el contexto del desarrollo de una nueva línea de investigación sobre espectroscopía molecular, en el Laboratorio de Terahertz y Astrofotónica de la Universidad de Chile, se realiza este trabajo que consiste en el desarrollo experimental de un sistema láser para la ali- mentación de fotomezcladores. Este sistema tiene como objetivo la generación de dos señales ópticas de alta estabilidad y coherencia, cuya diferencia de frecuencias puede ser ajustada de forma continua dentro del rango de 10 GHz a 300 GHz. Para esto, se utiliza un esquema basado en un peine de frecuencias óptico sobre el cual se enclava por inyección un láser de diodos de frecuencia sintonizable. Esto consigue tener una fuente infrarroja de alta precisión dentro de un gran rango. Además, se genera una segunda señal por medio de modulación en amplitud (AM), la cual es sintonizable dentro de un rango igual al espaciado producido por el peine óptico. En conjunto, estas señales logran abarcar un amplio espectro de frecuencias de forma continua sin perder estabilidad ni calidad de las señales. En este trabajo se logra implementar los subsistemas para la generación de cada una de las señales requeridas y se estudia la capacidad de estos para trabajar dentro del rango deseado. Para la señal generada por enclavamiento por inyección, se logra probar el concepto dentro de un rango reducido, principalmente por falta de un buen sistema de medición de altas frecuencias. Para la señal generada por modulación AM, se logran resultados positivos en todo el rango de diseño. Finalmente, se proponen modificaciones al sistema para mejorar su desempeño.
Este trabajo ha sido parcialmente financiado por Conicyt, a través de su fondo ALMA para el desarrollo de la astronomía, Proyecto 31140025, QUIMAL, Proyecto 1500010, CATA-Basal PFB06 y Fondecyt 1151213
Dolasinski, Brian David. "Nonlinear systems for frequency conversion from IR to RF." University of Dayton / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1417804168.
Повний текст джерелаSuizu, Koji, Kodo Kawase, and 晃道 川瀬. "Monochromatic-Tunable Terahertz-Wave Sources Based on Nonlinear Frequency Conversion Using Lithium Niobate Crystal." IEEE, 2008. http://hdl.handle.net/2237/11170.
Повний текст джерелаWang, Cheng. "Wideband and fast THz spectrometer using dual-frequency-comb on CMOS." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/118025.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 71-75).
Millimeter-wave/terahertz rotational spectroscopy of polar gaseous molecules provides a powerful tool for complicated gas mixture analysis. Here, a 220-to-320 GHz dual-frequency-comb spectrometer in 65-nm bulk CMOS is presented, along with a systematic analysis on fundamental issues of rotational spectrometer, including the impacts of various noise mechanisms, gas cell, molecular properties, detection sensitivity, etc. The spectrometer utilizes two counter-propagating frequency-comb signals to seamlessly scan the broadband spectrum. The comb signal, with 10 equally-spaced frequency tones, is generated and detected by a chain of inter-locked transceivers on chip. Each transceiver is based on a multi-functional electromagnetic structure, which serves as frequency doubler, sub-harmonic mixer and on-chip radiator simultaneously. In particular, theory and design methodology of a dual transmission line feedback scheme are presented, which maximizes the transistor gain near its cut-off frequency fmax. The dual-frequency-comb scheme does not only improve the scanning speed by 20 x, but also reduces the overall energy consumption to 90 mJ/point with 1 Hz bandwidth (or 0.5 s integration time). With its channelized 100-GHz scanning range and sub-kHz specificity, wide range of molecules can be detected. In the measurements, state-of-the-art total radiated power of 5.2 mW and single sideband noise figure (NF) of 14.6~19.5 dB are achieved, which further boost the scanning speed and sensitivity. Lastly, spectroscopic measurements for carbonyl sulfide (OCS) and acetonitrile (CH3CN) are presented. With a path length of 70 cm and 1 Hz bandwidth, the measured minimum detectable absorption coefficient reaches [alpha] gas,min=7 .2 x 10-7 cm- 1 . For OCS, that enables a minimum detectable concentration of 11 ppm. The predicted sensitivity for some other molecules reaches ppm level (e.g. 3 ppm for hydrogen cyanide (HCN)), or 10 ppt level if gas pre-concentration with a typical gain of 10 5 is used.
by Cheng Wang.
S.M.
Paquet, Romain. "Nouvelles sources lasers pour génération THz." Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTS017.
Повний текст джерелаThis work focuses on the design, realization and experimental study of highly coherent dual-frequency laser sources emitting at 1 µm for THz radiation generation by photomixing. We are particularly interested in vertical-external-cavity surface-emitting laser (VeCSEL), the aim being to obtain a robust dual-frequency continuous wave operation, based on simultaneous coexistence of two Laguerre-Gaussian transverse modes. We design intracavity transverse selective losses mask to select only the two Laguerre-Gaussian modes. The stable and simultaneous dual-frequency operation, the beat-frequency tunability range and the temporal coherence was specifically studied. We demonstrated THz emission by seeding a uni-travelling-carrier photodiode by an optically-pumped dual-frequency vertical-external-cavity surface-emitting
Cluff, Julian. "Time domain THz spectroscopy of semiconductors." Thesis, University of Bath, 2000. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311454.
Повний текст джерелаNiklas, Andrew John. "Characterization of Structured Nanomaterials using Terahertz Frequency Radiation." Wright State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=wright1347461386.
Повний текст джерелаThoma, Petra [Verfasser]. "Ultra-fast YBa2Cu3O7-x direct detectors for the THz frequency range / Petra Thoma." Karlsruhe : KIT Scientific Publishing, 2013. http://www.ksp.kit.edu.
Повний текст джерелаSung, Chieh. "Interaction of a relativistic electron beam with radiation in the THz frequency range." Diss., Restricted to subscribing institutions, 2008. http://proquest.umi.com/pqdweb?did=1679290761&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.
Повний текст джерелаWang, Yuekun. "In0.53Ga0.47As-In0.52Al0.48As multiple quantum well THz photoconductive switches and In0.53Ga0.47As-AlAs asymmetric spacer layer tunnel (ASPAT) diodes for THz electronics." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/in053ga047asin052al048as-multiple-quantum-well-thz-photoconductive-switches-and-in053ga047asalas-asymmetric-spacer-layer-tunnel-aspat-diodes-for-thz-electronics(5fd73bd5-aef3-476b-be1b-7498da3f9627).html.
Повний текст джерелаSuzanovičienė, Rasa. "Investigation of carrier kinetics in semiconductors by terahertz radiation pulses." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2010. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20101116_163924-89818.
Повний текст джерелаUltrasparčių puslaidininkinių komponentų kūrimas reikalauja gilesnio supratimo apie tai, kaip puslaidininkiuose vyksta fizikiniai procesai, trunkantys kelias pikosekundes ar net mažiau nei vieną pikosekundę. Tokie reiškiniai, kaip elektronų impulso ir energijos relaksacija bei nepusiausvyrųjų krūvininkų pagavimas yra labai svarbūs puslaidininkinių fotonikos ir terahercinio diapazono prietaisų veikimui. Iki pastarojo meto pagrindinis ultrasparčiųjų procesų puslaidininkiuose tyrimo įrankis buvo optiniai metodai, kuriuose elektronų dinamikai stebėti buvo pasitelkiami pikosekundinių ar femtosekundinių lazerių impulsai. Nepaisant išskirtinai didelės šių metodų laikinės skyros, optinio kaupinimo-zondavimo matavimų rezultatus yra palyginti sudėtinga interpretuoti. Šie rezultatai dažniausiai yra įtakojami kelių sistemos parametrų kitimo ir įvairių fizikinių reiškinių tarpusavio sąveikos, todėl sunkiai susiejamas su kuria nors elektronų laikine charakteristika. Disertacijos darbo tikslas – naudojant terahercinės spinduliuotės impulsus išmatuoti elektronų impulso ir energijos relaksacijos trukmes keliuose siauratarpiuose puslaidininkiuose bei jų gyvavimo trukmes medžiagose, skirtose fotolaidžių terahercinės spinduliuotės emiterių ir detektorių gamybai. Šioje disertacijoje yra pateikiami įvairių charakteringų elektroninius procesus puslaidininkiuose apibūdinančių trukmių matavimų naudojant terahercinės spinduliuotės impulsus rezultatai. Tokie tyrimai atlikti ir optinio žadinimo –... [toliau žr. visą tekstą]
Petersen, Eliot. "Cavity Enhanced THz Generation in Nonlinear Crystals Pumped by Near-IR Fiber Lasers." Diss., The University of Arizona, 2012. http://hdl.handle.net/10150/222833.
Повний текст джерелаSuzanovičienė, Rasa. "Krūvininkų kinetikos puslaidininkiuose tyrimai naudojant terahercinės spinduliuotės impulsus." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2010. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20101116_163938-18022.
Повний текст джерелаCreation of ultrafast semiconductor components is inconceivable without understanding various processes of picoscond duration in semiconductors. These processes, as electron energy relaxation time or nonequiriblium carrier capture are very important for semiconductor photonics and terahertz range devices. Since now, the most popular tool of measuring ultrafast processes in semiconductors was picosecond or femtosecond laser pulses. In spite of excellent time resolution, optical pump – probe methods have a significant imperfection. Interpretation of the results can be very complicate. Also, the measured result can be affected by few variable parameters or interaction of various physical phenomenon. Therefore determinate results can be hardly related with electron time dependent characteristic. The aim of this dissertation was to measure electron energy relaxation times and electron life times by using terahertz pulses in narrow – gap semiconductors used for photoconductive terahertz emitters or detectors. In this dissertation, electron characteristic times witch describe various processes in semiconductor, were studied. These measurements were performed by optical pump – terahertz probe technique and time domain terahertz spectroscopy. The emission of terahertz pulses from the semiconductor surface, illuminated by femtosecond laser pulses, was investigated.
Smith, Ryan Michael. "Terahertz frequency analysis of gaseous and solid samples using terahertz time-domain spectroscopy." Diss., University of Iowa, 2012. https://ir.uiowa.edu/etd/3386.
Повний текст джерелаKantemur, A., Q. Tang, and H. Xin. "Design of volumetric sub-THz negative refractive index metamaterial with gain." IEEE, 2016. http://hdl.handle.net/10150/622669.
Повний текст джерелаMajeed, Farhat. "Screen Printed and Graphene and Carbon Nanotube Antennas at UHF and EHF - Design, Modelling and Measurement." Thesis, Griffith University, 2018. http://hdl.handle.net/10072/376514.
Повний текст джерелаThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Eng & Built Env
Science, Environment, Engineering and Technology
Full Text
Mu, Tangjie. "Heteroepitaxy of OP-GaP on GaAs for frequency conversion in mid-IR and THz regions." Thesis, KTH, Tillämpad fysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-265627.
Повний текст джерелаMotzkau, Holger. "High-frequency phenomena in small Bi2Sr2CaCu2O8+x intrinsic Josephson junctions." Doctoral thesis, Stockholms universitet, Fysikum, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-115582.
Повний текст джерелаSinha, Raju. "Tunable, Room Temperature THz Emitters Based on Nonlinear Photonics." FIU Digital Commons, 2017. http://digitalcommons.fiu.edu/etd/3172.
Повний текст джерелаKaltenecker, Korbinian J. [Verfasser], Hanspeter [Akademischer Betreuer] Helm, Markus [Akademischer Betreuer] Walther, and Bernd-Michael [Akademischer Betreuer] Fischer. "Breaking the diffraction limit : experiment and theory on sub-diffraction limited focusing and imaging realised in the THz frequency regime." Freiburg : Universität, 2016. http://d-nb.info/1119899370/34.
Повний текст джерелаArenas, Daniel J. "Devices and materials for THz spectrosopy [sic] GHz CMOS circuits, periodic hole-arrays and high-frequency dielectric materials /." [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0024735.
Повний текст джерелаMei, Jialin, Kai Zhong, Maorong Wang, Pengxiang Liu, Degang Xu, Yuye Wang, Wei Shi, Jianquan Yao, Robert A. Norwood та Nasser Peyghambarian. "Compact high-repetition-rate terahertz source based on difference frequency generation from an efficient 2-μm dual-wavelength KTP OPO". SPIE-INT SOC OPTICAL ENGINEERING, 2016. http://hdl.handle.net/10150/622890.
Повний текст джерелаBeneš, Adam. "Plazmonické antény pro vysoké vlnové délky." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443226.
Повний текст джерелаFang, Qiang. "2 μm Pulsed Fiber Laser Sources and Their Application in Terahertz Generation". Diss., The University of Arizona, 2012. http://hdl.handle.net/10150/232475.
Повний текст джерелаMeier, Steffen Marius [Verfasser], Uwe [Gutachter] Czarnetzki, and Horst [Gutachter] Fichtner. "Plasmadichtebestimmung mittels Dual-Frequency-Multichannel-Boxcar-THz-Time-Domain-Spektroskopie / Steffen Marius Meier ; Gutachter: Uwe Czarnetzki, Horst Fichtner ; Fakultät für Physik und Astronomie." Bochum : Ruhr-Universität Bochum, 2018. http://d-nb.info/1161942327/34.
Повний текст джерелаSeif, Marcelino. "Caractérisation et modélisation des sources de bruit BF dans les transistors bipolaires développés en technologie BiCMOS (sub 0,13µm) pour applications RF et THz." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS127/document.
Повний текст джерелаThe presented thesis work, in this manuscript, focuses on the characterization and modeling of the low frequency noise sources in heterojunction bipolar transistors Si/SiGe :C derived from 130 to 55 nm BiCMOS technology used in the production of integrated circuits dedicated for THz domain applications. From measurements versus bias, geometrical parameters (emitter area and perimeter) and temperature, the 1/f noise component, associated to the base current fluctuations, has been fully characterized and the associated sources have been localized. The SPICE compact model parameters have been extracted and compared with those of the literature. For the BiCMOS 130 nm technology, the obtained figure of merit value of 6,8 10-11 µm2 represents the best published result so far in all bipolar transistors. The dispersion study of the 1/f noise component, performed over a complete wafer, allowed us to extend the SPICE type compact modeling. Measured over a large temperature range, the 1/f noise did not show any variations. For the first time, a complete characterization of the 1/f component at the output of the transistors is presented as well as the extraction of SPICE parameters. Regarding the characterization of generation-recombination components (unsystematic presence), a statistical study has showed that transistors with small emitter areas (Ae < 1 µm2) are affected more than the transistors with large emitter areas by the presence of g-r components. Comparison between different technologies shows that these components are much more present in the less mature technologies. When these components have been associated to RTS, time and frequency domain method is implemented. Finally, in some cases, a study at low temperatures was used to extract the activation energy of the traps responsible for the generation-recombination components
Danion, Gwennaël. "Synthétiseur micro-onde à térahertz ultra-stable." Thesis, Rennes 1, 2015. http://www.theses.fr/2015REN1S014/document.
Повний текст джерелаThe aim of this thesis is the optical synthesis of millimeter and submillimeter waves with a very low phase noise. The first part concerns the development of a dual-axis dual frequency laser, whose the two frequencies are tuneable independently and continuously on 1 THz. This laser is characterized in amplitude noise and phase noise. We have identified a coupling factor between the diode pump and the power fluctuations of the laser phase noise. In the second part, we report the development of an amplifier system which consists of an EDFA and a SOA per polarisation axis. This amplifier system delivers 17 dBm of power and reduces the relative intensity noise (RIN) by 20 dB on a 1 GHz bandwidth. This amplifier is also an actuator for the power stabilization to a RIN of the order of -150 dB/Hz from 3 Hz to 5 kHz. The last part concerns the setup of the cavity bench and the stabilization of the laser frequency on a ultrastable cavity. We obtain a phase noise at 10 kHz of frequency offset on a 10 GHz carrier better than the noise floor of a phase noise analyser with high performance of the order of -115 dBc/Hz. The system phase noise is independent of the beatnote frequency
Khairuzzaman, Md. "Digitally selected electronically switchable terahertz-over-fibre." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/digitally-selected-electronically-switchable-terahertzoverfibre(7003c9cb-fa46-4933-9348-b1977a446b7f).html.
Повний текст джерелаMartínek, Tomáš. "Návrh nerezonančního držáku vzorku pro obecné použití v terahertzové elektronové spinové resonanční spektroskopii." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-382623.
Повний текст джерелаCollombon, Mathieu. "Résonance noire à trois photons sur un nuage d'ions calcium confinés." Thesis, Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0017.
Повний текст джерелаThe work presented in this thesis describes the complete experimental set-up and approach to realize three-photon coherent population trapping in a cloud of radiofrequency confined calcium ions. The realization of such a population trapping relies on a stringent conditions of the phase relationship between the three lasers involved in the interrogation process, and also their spectral linewidths. Our experimental approach is based on the optimization of the performance of a frequency-stabilized titanium-sapphirelaser at 411 THz (729nm) at the 10⁻¹⁴ level, in term of relative frequency uncertainties. This laser’s fre-quency stability is subsequently transfered to a optical frequency comb by means of a phase-locked loop. Then the two other lasers involved (866 nm and 794 nm) are phase-locked to the optical frequency combwith the same technique. This work describes the transfer method along with its measured performances. With all the three lasers sharing the same ultra-stable frequency reference we have been able to experi-mentally observe for the first time a 3-photon dark resonance in the fluorescence spectra of the 40 Ca⁺, signature of a coherent population trapping in a 3-photon scheme. The dependence of this resonance at experimental parameters, such as laser powers, laser detunings and local magnetic field, have been studied and are presented in this work. The preliminary results have allowed to explain the behaviour of the dark resonance and explored conditions for the use of the 3-photon dark line as a THz frequency standard
Ayoub, Anas. "Sources laser ultrarapides performantes dans le moyen IR et le Tz." Thesis, Normandie, 2020. http://www.theses.fr/2020NORMR044.
Повний текст джерелаThe atome probe tomography is an instrument for analyzing matter in three dimensions with atomic resolution. This instrument relies on the effect of an electric field generated at the end of a sample cut into the shape of a nanoscale needle to evaporate the surface atoms which are collected by a two-dimensional detector. The measurement of the time of flight of the ions whose evaporation is triggered by an electrical or optical pulse makes it possible to measure the chemical composition in addition to the 3D localization of the atoms. In current atome probes, atomic evaporation is triggered by a high-speed laser emitting in the UV. However, the interaction of UV light with matter induces thermal heating which limits the mass resolution of the instrument and prevents its use for the analysis of fragile materials such as biocompatible components. This thesis work aims to study solutions to promote rapid evaporation while inhibiting unwanted thermal effects of the laser in atome probe. Our approach consists in exploiting ultrashort pulses in the mid-infrared or THz domain due to their high ponderomotive energy associated with low photon energy. This manuscript reports on the development of a bench for the generation and characterization of intense THz pulses. Coupling these radiations with a negatively polarized metallic nanotip has made it possible to characterize the near field induced at the surface of the nanotip, which is strongly modified by the antenna effect. The second part reports on the development of an ultra-fast laser source tunable in the mid-infrared around 3 mm using fluoride glass fibers
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.
Повний текст джерелаWalker, 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.
Повний текст джерелаThesis 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.
Повний текст джерелаDi, Malta Gina. "The development and validation of the Relational Depth Frequency Scale." Thesis, University of Roehampton, 2016. https://pure.roehampton.ac.uk/portal/en/studentthesis/the-development-and-validation-of-the-relational-depth-frequency-scale(b248083e-6a9a-4f62-b92f-cc1b6987b18c).html.
Повний текст джерелаGeladakis, 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.
Повний текст джерела"December 1996." Thesis advisor(s): Gurnam S. Gill. Includes bibliographical references (p. 45). Also available online.
Bhattacharya, Gautam. "Sparse denoising of audio by greedy time-frequency shrinkage." Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=123263.
Повний текст джерелаL'algorithme de Matching Pursuit (MP) construit par itérations une représentation parcimonieuse du signal, au prix d'un coût de calcul élevé. Ce mémoire présente une analyse de l'algorithme de MP dans le contexte du débruitage audio. En interprétant l'algorithme MP comme une méthode de contraction simple (simple shrinkage), nous chercherons à identifier les facteurs essentiels à son succès, puis proposerons plusieurs approches afin d'en améliorer les performances et la robustesse. Plusieurs améliorations du modèle seront ainsi développées, et une approche du débruitage audio dénommée Greedy Time-Frequency Shrinkage (GTFS) sera présentée en détails. Des expérimentations numériques appliquées à un large éventail de signaux sonores démontrent que les résultats obtenus par débruitage GTFS s'avèrent compétitifs face aux méthodes de débruitage audio qui constituent l'état de l'art. En particulier, le GTFS ne retient qu'un faible pourcentage des coefficients de la transformée du signal pour en construire une représentation débruitée, et produit ainsi des résultats débruités très compacts.
Koller, Angela Erika. "The frequency assignment problem." Thesis, Brunel University, 2004. http://bura.brunel.ac.uk/handle/2438/4967.
Повний текст джерелаJones, Graeme Stephen. "Instantaneous frequency, time-frequency distributions and the analysis of multicomponent signals." Thesis, Queensland University of Technology, 1992.
Знайти повний текст джерелаLi, Shaomeng. "Do more mergers and acquisitions create value for the firm?" Thesis, Brunel University, 2015. http://bura.brunel.ac.uk/handle/2438/10536.
Повний текст джерелаGordon, Jocelynne E. "Nighttime fears in children : origins, frequency, content and severity." Monash University, Faculty of Education, 2004. http://arrow.monash.edu.au/hdl/1959.1/5321.
Повний текст джерелаXu, 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.
Повний текст джерелаLedingham, 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.
Повний текст джерелаWilliams, N. G. "Frequency domain parameter identification and the statistical properties of frequency response estimates." Thesis, Loughborough University, 1993. https://dspace.lboro.ac.uk/2134/25141.
Повний текст джерелаLabib, Amr. "Crack detection in frames using natural frequency degradations." Thesis, Cardiff University, 2016. http://orca.cf.ac.uk/88543/.
Повний текст джерелаOmara, Hisham. "A methodology for determining the load frequency sensitivity." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/a-methodology-for-determining-the-load-frequency-sensitivity(fcad5d22-66b2-4964-a32a-461fec5ffcb2).html.
Повний текст джерелаChen, Shuming. "Filtering in the frequency domain." Thesis, University of Sheffield, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.434612.
Повний текст джерелаCassady, Charles Richard. "The frequency distribution of availability." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-09052009-040624/.
Повний текст джерелаXu, Dongming. "On the testing of the RFID security /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?CSED%202009%20XU.
Повний текст джерелаPaje, Vladimir I. "THE EFFECTS OF CARRIER FREQUENCY AND ANTENNA DIAMETER ON FREQUENCY SELECTIVE MULTIPATH FADING." International Foundation for Telemetering, 2000. http://hdl.handle.net/10150/606502.
Повний текст джерелаThis paper uses ARTM channel sounding data collected at Edwards Air Force Base to investigate the dependency between the characteristics of frequency selective multipath fading and carrier frequency and ground based received antenna diameter. Channel model parameters are obtained from data sets measured at different frequencies and various ground based antenna diameters. The analysis shows that the multipath characteristics do not statistically change between the L-band and S-band carrier frequencies, but do change with antenna diameter. Furthermore, Flight 18 data shows that antenna diversity may be a useful technique to reduce data loss from multipath fading.