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Dissertations / Theses on the topic 'RF Sources'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Kurpad, Krishna Nagaraj. "Transmit field pattern control for high field magnetic resonance imaging with integrated RF current sources." Texas A&M University, 2004. http://hdl.handle.net/1969.1/2755.

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The primary design criterion for RF transmit coils for MRI is uniform transverse magnetic (B1) field. Currently, most high frequency transmit coils are designed as periodic, symmetric structures that are resonant at the imaging frequency, as determined by the static magnetic (B0) field strength. These coils are excited by one or more voltage sources. The distribution of currents on the coil elements or rungs is determined by the symmetry of the coil structure. At field strengths of 3T and above, electric properties such as the dielectric constant and conductivity of the load lead to B1 field i

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2

Rauner, David [Verfasser], та Ursel [Akademischer Betreuer] Fantz. "Eﬃciency of RF plasma generation for fusion relevant ion sources / David Rauner ; Betreuer: Ursel Fantz". Augsburg : Universität Augsburg, 2019. http://d-nb.info/1181693330/34.

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3

Maxey, Christopher Allen. "Switched-Tank VCO Designs and Single Crystal Silicon Contour-Mode Disk Resonators for use in Multiband Radio Frequency Sources." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/10074.

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To support the large growth in wireless devices, such as personal data assistants (PDAs), wireless local area network (WLAN) enabled laptop computers, and intelligent transportation systems (ITS), the FCC allocated three high-frequency bands for unlicensed operation. Of particular interest is the 5-6 GHz Unlicensed National Information Infrastructure (UNII) band intended to support high-speed WLAN applications. The UNII band is further split into three smaller 100 MHz sub-bands: 5.15 - 5.25 GHz; 5.25-5.35 GHz; and 5.725-5.825 GHz. VCOs that can be switched between each of the three UNII sub-b

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4

Mimo, Alessandro [Verfasser], and Ursel [Akademischer Betreuer] Fantz. "Optimization of Caesium Dynamics in Large and Powerful RF Sources for Negative Hydrogen Ions / Alessandro Mimo ; Betreuer: Ursel Fantz." Augsburg : Universität Augsburg, 2018. http://d-nb.info/1165503328/34.

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5

Abdallah, Zeina. "Microwave sources based on high quality factor resonators : modeling, optimization and metrology." Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30267/document.

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La technologie photonique-RF offre une alternative intéressante à l'approche purement électronique dans différents systèmes micro-ondes pour des applications militaires, spatiales et civiles. Un composant original, l'oscillateur optoélectronique (OEO), permet la génération de signaux RF stables et à haute pureté spectrale. Il est basé sur une liaison photonique micro-onde utilisée comme boucle de rétroaction et comportant soit une fibre longue, soit un résonateur à fort coefficient de qualité. Différentes études ont été menées au cours de cette thèse afin d'optimiser et d'améliorer la performa

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6

Wimmer, Christian Verfasser], and Ursel [Akademischer Betreuer] [Fantz. "Characteristics and Dynamics of the Boundary Layer in RF-driven Sources for Negative Hydrogen Ions / Christian Wimmer. Betreuer: Ursel Fantz." Augsburg : Universität Augsburg, 2014. http://d-nb.info/1077704674/34.

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Wimmer, Christian [Verfasser], and Ursel [Akademischer Betreuer] Fantz. "Characteristics and Dynamics of the Boundary Layer in RF-driven Sources for Negative Hydrogen Ions / Christian Wimmer. Betreuer: Ursel Fantz." Augsburg : Universität Augsburg, 2014. http://d-nb.info/1077704674/34.

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8

Chamas, Ibrahim. "The Analysis and Design of Phase-tunable Low-Power Low-Phase-Noise I/Q Signal Sources for Analog Phase Calibrated Transceivers." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/102076.

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Due to the demand for low-cost, small-form factor and large-scale integration of system-on-chip wireless transceivers, the image-reject, zero-IF and low-IF receiver architectures have become the main topologies used in mainstream wireless communication systems. Consequently, signal sources with quadrature phase outputs [quadrature oscillators (QOs)] are therefore essential, and their phase noise, driving capability, tuning range, oscillation frequency, and power consumption have a major impact on the overall receiver performance. Additionally, it is required that the QO synthesize precise I/Q

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9

Seif, 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.

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Les travaux de thèse, présentés dans ce manuscrit, portent sur la caractérisation et la modélisation des sources de bruit basse fréquence dans les transistors bipolaires à hétérojonction Si/SiGe:C issus des filières BiCMOS 130 et 55 nm utilisées pour la réalisation de circuits intégrés dédiés aux futures applications dans le domaine du THz. A partir des mesures réalisées en fonction de la polarisation, de paramètres géométriques (surface et périmètre d'émetteur principalement) et de la température, la composante de bruit en 1/f, associée aux fluctuations du courant de base, a été entièrement c

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10

Broue, Adrien. "Analyse multi physique des sources de défiabilisation du microcontact électrique à destination des interrupteurs MEMS." Toulouse 3, 2012. http://thesesups.ups-tlse.fr/1985/.

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Les micro- et nanotechnologies (MNT) connaissent aujourd'hui un essor important dans des domaines très variés. On observe en particulier un développement des filières de micro-interrupteurs. En effet, les interrupteurs MEMS ont démontré un gain de performances significatif en comparaison avec les systèmes de commutation actuels. Ces composants sont donc devenus très attractifs pour de nombreuses applications grand public et haute fiabilité, notamment en raison de la facilité d'intégration des microsystèmes à d'autres composants passifs ou issus de la filière microélectronique. L'énorme potenti

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11

Jain, Palak. "Studies and experimental activities to qualify the behaviour of RF power circuits for Negative Ion Sources of Neutral Beam Injectors for ITER and fusion experiments." Doctoral thesis, Università degli studi di Padova, 2018. http://hdl.handle.net/11577/3425385.

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The International Thermonuclear Experimental reactor (ITER), the world’s largest experimental facility in the realm of nuclear fusion for energy production, requires two Neutral Beam Injectors (NBI) rated for the total power of 33 MW for plasma heating and current drive. The ITER NBI includes an ion source which can produce 40 A of D¯ ions beams for 3600 s, accelerated at the energy of 1 MeV. The requirements for the ITER NBI are quite demanding and have never been achieved before all together in a single device. This specifically called for a development of the ITER Neutral Beam Test Facility

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12

Broué, Adrien. "Analyse multi-physique des sources de défiabilisation du microcontact ohmique dans les interrupteurs MEMS." Phd thesis, Université Paul Sabatier - Toulouse III, 2012. http://tel.archives-ouvertes.fr/tel-00862813.

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Les micro- et nanotechnologies (MNT) connaissent aujourd'hui un essor important dans des domaines très variés. On observe en particulier un développement des filières de micro-interrupteurs. En effet, les interrupteurs MEMS ont démontré un gain de performances significatif en comparaison avec les systèmes de commutation actuels. Ces composants sont donc devenus très attractifs pour de nombreuses applications grand public et haute fiabilité, notamment en raison de la facilité d'intégration des microsystèmes à d'autres composants passifs ou issus de la filière microélectronique. L'énorme potenti

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13

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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14

Serrière, Vincent. "Dynamique longitudinale du faisceau dans les anneaux de stockage d'électrons équipés d'un système RF harmonique pour allonger les paquets : Application aux sources de lumière synchroton et amélioration du temps de vie attendue à l'ESRF." Paris 11, 2002. http://www.theses.fr/2002PA112275.

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Sur les sources circulaires de rayonnement synchrotron, des cavités RF harmoniques permettent d'augmenter la durée de vie Touschek d'un facteur 2 à 4 en allongeant les paquets. Certains effets secondaires peuvent limiter le gain en durée de vie, voire déstabiliser le faisceau ou au contraire le stabiliser. Le but de cette thèse a été l'évaluation de systèmes RF harmoniques en tenant compte de leur interaction avec tous les mécanismes de dynamique longitudinale dans diverses conditions d'opération. Des modèles de poursuite (tracking) ont été développés car les méthodes de calcul standard ne s'a

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15

O'Connor, Kevin A. Curry Randy D. "Compact power conditioning and RF systems for a high power RF source." Diss., Columbia, Mo. : University of Missouri--Columbia, 2008. http://hdl.handle.net/10355/6285.

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Title from PDF of title page (University of Missouri--Columbia, viewed on Feb. 19, 2010). The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Dr. Randy Curry, Thesis Supervisor Includes bibliographical references.

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16

Schucker, Thomas Douglas, and Thomas Douglas Schucker. "Emitter Source Geolocation from Imparted Rotor Blade Modulation." Thesis, The University of Arizona, 2016. http://hdl.handle.net/10150/623262.

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In RF communications with a rotorcraft such as a helicopter, the rotor blades can impart a modulation onto the received signal called Rotor Blade Modulation (RBM). This modulation is caused by the reflection of a signal off the rotating blades. The reflected signal is Doppler shifted based on where the signal is reflected along the length of the blade as well as the angle between the axis of rotation and the emitter. RBM is known to degrade the performance of RF communications on rotorcraft and can be used in radar applications to detect and classify aircraft, but there is little on its useful

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17

Melicher, Milos. "An Enhancement of Existing RF Data Links Using Advanced Diversity Techniques." International Foundation for Telemetering, 2010. http://hdl.handle.net/10150/605912.

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ITC/USA 2010 Conference Proceedings / The Forty-Sixth Annual International Telemetering Conference and Technical Exhibition / October 25-28, 2010 / Town and Country Resort & Convention Center, San Diego, California<br>The theoretical capacity of communication channel in the presence of additive white Gaussian noise (AWGN) as defined by Shannon's channel capacity theorem has been well understood since 1940s. This theorem bounds the bit error rate (BER) of RF data links achievable for a particular noise level. The development in digital technology over the last decade has made it possible not ju

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18

Book, Stefan. "1kW Class-E solid state power amplifier for cyclotron RF-source." Thesis, Uppsala universitet, FREIA, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-341693.

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This thesis discusses the design, construction and testing of a highefficiency, 100 MHz, 1 kW, Class-E solid state power amplifier. The design was performed with the aid of computer simulations using electronic design software (ADS). The amplifier was constructed around Ampleon's BLF188XR LDMOS transistor in a single ended design. The results for 100 MHz operation show a power added efficiency of 82% at 1200 W pulsed power output. For operation at 102 MHz results show a power added efficiency of 86% at 1050 W pulsed power output. Measurements of the drain- and gate voltage waveforms provide va

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19

Shields, Brendan John. "Loading a planar RF Paul Trap from a cold Yb⁺ source." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/36117.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2006.<br>Includes bibliographical references (p. 61-63).<br>In this thesis, we demonstrate a functioning planar radio frequency, three-rod Paul Trap, loaded with Yb+ ions that have been photoionized from a source of neutral atoms, which were cooled in a magneto-optical trap. Planar ion traps have only recently been successfully loaded[1], and never from a cold ion source. Additionally, ionizing directly from a MOT allows for isotope selection.<br>by Brendan John Shields.<br>S.B.

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20

Lee, ByungKun. "RF test methods for balanced receivers for swept source optical coherence tomography." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/77446.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2012.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 47-48).<br>Optical coherence tomography (OCT) has risen as a clinical standard of diagnosis and management of ocular diseases since its development in 1991 by the MIT group and the collaborators. Since current cutting-edge OCT technology based on frequency-swept lasers has achieved scanning rate over 1,000,000 axial scans per second, the imaging speed is limited by the detection and analog-to-dig

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21

McIntyre, Dustin L. "The coaxial cavity resonator as a prototype RF IC engine ignition source." Morgantown, W. Va. : [West Virginia University Libraries], 2000. http://etd.wvu.edu/templates/showETD.cfm?recnum=1504.

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Thesis (M.S.)--West Virginia University, 2000.<br>Title from document title page. Document formatted into pages; contains xii, 119 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 106-107).

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22

Slobodan, Birgermajer. "Nove konfiguracije mikrotalasnih pasivnih kola u tehnologiji mikrostrip grebenastog talasovoda na bazi procepa." Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2018. https://www.cris.uns.ac.rs/record.jsf?recordId=107817&source=NDLTD&language=en.

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Ubrzan razvoj bežičnih komunikacionih sistema postavlja zahtev za razvojem novih kompaktnih kola visokih performansi, na visokim učestanostima u mikrotalasnom i milimetarskom opsegu, koja će zadovoljiti potrebu za većim brzinama za prenos velike količine podataka. U okviru ove disertacije su predstavljena pasivna kola projektovana u tehnologiji mikrostrip talasovoda na bazi procepa, koja mogu da zadovolje zahteve postavljene od komunikacionih sistema.Predstavljeno je šest filtarskih topologija i jedan sprežnik. Prve četiri filtarske topologije zasnovane su na novim minijaturnim rezonantnim šup

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23

Andrea, Marić. "Metode za poboljšanje RF performansi mikro-induktorskih i transformatorskih struktura." Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2016. http://www.cris.uns.ac.rs/record.jsf?recordId=101196&source=NDLTD&language=en.

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Tematika disertacije obuhvata projektovanje, izradu i karakterizaciju pasivnih induktivnih RF komponenti u PCB i LTCC tehnologiji, kao i poboljšanje njihovih performansi. Izvršena je i karakterizacijarazličitih tipova dielektričnih i feritnih  LTCC materijala koji su korišćeni za izradu komponenti. Ukupno je projektovano i izrađeno 37 struktura, 14 induktora i 23 transformatora. Na poboljšanje karakteristika projektovanih struktura, koje se ogleda prvenstveno u povećanju induktivnosti zavojaka, uticalo se izradom projektovanih struktura na supstratima izrađenih od različitih materijala, s

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24

Lu, Cheng, John Roach, and George Sasvari. "Utilization of an IEEE 1588 Timing Reference Source in the iNET RF Transceiver." International Foundation for Telemetering, 2008. http://hdl.handle.net/10150/606168.

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ITC/USA 2008 Conference Proceedings / The Forty-Fourth Annual International Telemetering Conference and Technical Exhibition / October 27-30, 2008 / Town and Country Resort & Convention Center, San Diego, California<br>Synchronization of the iNET communication link is essential for implementing the TDMA channel access control functions within the transceiver MAC transport layer, and providing coherent signal demodulation timing at the transceiver PHY layer. In the following implementation, the 1588 timing reference source is the GPS receiver. Because it is being used in the Ground Station Segm

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25

Schnaffnit, Catherine. "Elaboration de couches minces de nitrure de bore par voie chimique assistée par plasma R. F. à partir de BCl3/N2/H2/Ar : étude du procédé et des propriétés physico-chimiques du matériau." Grenoble INPG, 1996. http://www.theses.fr/1996INPG0125.

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Des couches minces de nitrure de bore ont ete synthetisees a partir de melanges bcl#3/n#2/h#2/ar dans un reacteur plasma r. F. A couplage capacitif. L'etude a porte dans un premier temps sur la caracterisation de la phase gazeuse par spectrometrie de masse et par spectroscopie optique d'emission. En particulier, l'effet de la teneur de la phase gazeuse en hydrogene sur la nature et la concentration relative des especes a ete etudie: tout d'abord dans un plasma argon-hydrogene, dans lequel ont ensuite ete ajoutes les deux precurseurs bcl#3 et n#2, separement puis simultanement. Le debit d'hydro

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26

Chaour, Issam. "Efficiency Improvement of RF Energy Transfer by a Modified Voltage Multiplier RF DC Converter." Universitätsverlag Chemnitz, 2018. https://monarch.qucosa.de/id/qucosa%3A33143.

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Radio Frequency (RF) energy transfer is getting increasingly importance in new generations of wireless sensor networks and this trend is tremendously supported by the modern trends to Internet of things (IoT). This promising technology enables proactive energy replenishment for wireless devices. With RF energy, transmission long distances between the energy source and the receiver can be overbridged. The main challenge thereby is the power conversion efficiency from a low level RF input power to a Direct Current (DC) voltage which is able to supply the mobile system. For this purpose, a novel

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27

Ozdur, Ibrahim Tuna. "Low noise, narrow optical linewidth semiconductor-based optical comb source and low noise RF signal generation." Doctoral diss., University of Central Florida, 2011. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5009.

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Recently optical frequency combs and low noise RF tones are drawing increased attention due to applications in spectroscopy, metrology, arbitrary waveform generation, optical signal processing etc. This thesis focuses on the generation of low noise RF tones and stabilized optical frequency combs. The optical frequency combs are generated by a semiconductor based external cavity mode-locked laser with a high finesse intracavity etalon. In order to get the lowest noise and broadest bandwidth from the mode-locked laser, it is critical to know the free spectral range (FSR) of the etalon precisely.

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28

Castaneda-Villa, Norma. "Independent component analysis and source analysis of auditory evoked potentials for assessment of cochlear implant users." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/161079/.

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Source analysis of the Auditory Evoked Potential (AEP) has been used before to evaluate the maturation of the auditory system in both adult and children; in the same way, this technique could be applied to ongoing EEG recordings, in response to acoustic specific frequency stimuli, from children with cochlear implants (CI). This is done in oder to objectively assess the performance of this electronic device and the maturation of the child‟s hearing. However, these recordings are contaminated by an artifact produced by the normal operation of the CI; this artifact in particular makes the detecti

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29

Ikram, M. "Radio-frequency generation of an electron plasma in a Malmberg-Penning trap and its interaction with a stationary or pulsed electron beam." Doctoral thesis, Università degli Studi di Milano, 2014. http://hdl.handle.net/2434/233616.

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Experiments and numerical investigations on trapped electron plasmas and traveling electron bunches are discussed. A Thomson backscattering diagnostics set up was installed in the ELTRAP (Electron TRAP) device, a Penning-Malmberg trap operating at the Department of Physics of the University of Milano since 2001. Here, an infrared (IR) laser pulse collides with nanosecond electron bunches with an energy of 1-20 keV traveling through a longitudinal magnetic field in a dynamical regime where space-charge effects play a significant role. The backscattered radiation is optically filtered and detec

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30

Alena, Đugova. "Nova konfiguracija širokopojasnog nisko-šumnog pojačavača u CMOS tehnologiji." Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2016. https://www.cris.uns.ac.rs/record.jsf?recordId=100329&source=NDLTD&language=en.

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Nisko-šumni pojačavač (NŠP) nalazi se u prijemnom delu bežičnogprimopredajnika neposredno nakon antene. NJegova uloga je da ulaznisignal određene frekvencije i male snage izdvoji i pojača iznad nivoašuma prijemnika. U okviru doktorske disertacije prikazane su iopisane metode za projektovanje širokopojasnih (UWB) NŠP u CMOStehnologiji. Ukupno je predloženo devet novih konfiguracija NŠP. Naosnovu dobijenih rezultata, u 0,18 μm UMC CMOS tehnologijirealizovan je i fabrikovan NŠP jednostavne topologije, kojapredstavlja zbir dva pristupa, pojačavačkog stepena kaskodnestrukture sa povratnom sprego

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Del, Pozo Rodriguez Sofia. "Investigation and optimisation of a plasma cathode electron beam gun for material processing applications." Thesis, Brunel University, 2016. http://bura.brunel.ac.uk/handle/2438/13565.

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This thesis describes design, development and testing work on a plasma cathode electron beam gun as well as plasma diagnosis experiments and Electron Beam (EB) current measurements carried out with the aim of maximising the power of the EB extracted and optimising the electron beam gun system for material processing applications. The elements which influence EB gun design are described and put into practice in a thermionic EB gun case study. The relevant principles of plasma EB gun systems, such low-temperature, low-pressure, RF excitation, are described along with the test rigs developed to i

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32

Uesugi, Y., T. Imai, K. Kawada, and S. Takamura. "3RD HARMONIC OPERATION OF SIT INVERTER RF SOURCE FOR ICRF HEATING IN THE DIVERTOR PLASMA SIMULATOR NAGDIS-Ⅱ." IEEE, 2001. http://hdl.handle.net/2237/7170.

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33

Siriwan, Krainara. "Investigation and improvement of the performance of THz Coherent Undulator Radiation source driven by a photocathode RF gun." Kyoto University, 2019. http://hdl.handle.net/2433/244571.

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34

Efimova, Varvara, Volker Hoffmann, and Jürgen Eckert. "Electrical properties of the µs pulsed glow discharge in a Grimm-type source: comparison of dc and rf modes." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-138728.

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The electrical properties, in particular the U–I characteristics, current and voltage signal shapes within the pulse, are important parameters for the understanding of the processes taking place in the pulsed glow discharge (PGD). The electrical properties are also closely related to the analytical performance of the PGD such as sputtering rates, crater shapes and emission yields. Moreover, the dependence of the U–I plots on the density of the discharge gas can be used to estimate the gas temperature. This result is relevant for the analysis of thermally fragile samples. Nevertheless, there is

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Efimova, Varvara, Volker Hoffmann, and Jürgen Eckert. "Electrical properties of the µs pulsed glow discharge in a Grimm-type source: comparison of dc and rf modes." Royal Society of Chemistry, 2011. https://tud.qucosa.de/id/qucosa%3A27775.

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The electrical properties, in particular the U–I characteristics, current and voltage signal shapes within the pulse, are important parameters for the understanding of the processes taking place in the pulsed glow discharge (PGD). The electrical properties are also closely related to the analytical performance of the PGD such as sputtering rates, crater shapes and emission yields. Moreover, the dependence of the U–I plots on the density of the discharge gas can be used to estimate the gas temperature. This result is relevant for the analysis of thermally fragile samples. Nevertheless, there is

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36

Dieudonné, Christophe. "Synchronisation d'un oscillateur à transfert de spin à une source de courant RF : mécanismes et caractérisation à température ambiante." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAY095/document.

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Les oscillateurs à transfert de spin (STO) sont des oscillateurs nanométriques (~100nm) prometteurs pour les applications radiofréquence. Ils reposent sur la précession de l'aimantation d'une couche magnétique mince induite par transfert de spin (STT). Un dispositif STO basé sur jonction tunnel magnétique (MTJ) fournira typiquement un signal électrique de l'ordre d'une dizaine de GHz et d'une puissance de plusieurs nW. Comparés aux oscillateurs contrôlés en tension (VCO) utilisés actuellement pour la génération de microondes, les STO ont l'avantage d'être hautement accordables en fréquence. Ma

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FRANCO, MANUEL. "Induction chez la souris de cellulest cytotoxiques cd8+ specifiques de la souche rf du rotavirus bovin." Paris 7, 1993. http://www.theses.fr/1993PA077255.

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Le rotavirus est l'agent pathogene le plus important responsable des diarrhees severes chez l'enfant. Les mecanismes immunitaires qui induisent une protection vis-a-vis des rotavirus sont meconnus. Cette etude concerne la reponse de cellules t cytotoxiques (ctl) specifiques du rotavirus bovin de la souche rf chez des souris c57bl/6, balb/c et c3h. Chez les souris c57bl/6, nous avons mis en evidence ces ctl apres une reponse secondaire in vitro. Ces ctl presentent une reaction croisee avec les souches wa (humaine) et sa11 (simienne) de rotavirus. Chez les souris balb/c et c3h, nous n'avons pas

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Maistrello, Alberto. "Characterization of the dielectric strength in vacuum of RF drivers for fusion neutral beam injectors." Doctoral thesis, Università degli studi di Padova, 2018. http://hdl.handle.net/11577/3422806.

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The two projects of the ITER Neutral Beam Test Facility (NBTF) [1] in Padova are MITICA, the full scale prototype of the heating Neutral Beam Injector (NBI) and SPIDER, the full-size negative ion source of the NBI. Both include a Radio Frequency (RF) Ion Source where plasma is produced by the inductive coupling with coils wound around vacuum chambers called drivers. Each coil is fed at 1 MHz up to a power of 100 kW, which corresponds to a voltage of about 12 kV rms, with nominal plasma parameters. The ion source design derives from the R&D carried out at the Max-Planck-Institut für Plasmaphys

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Guglielmi, Alexandre. "Propulseur à courant de Hall double étage à source RF inductive : étude expérimentale du fonctionnement et des instabilités basses fréquences." Thesis, Toulouse 3, 2020. http://www.theses.fr/2020TOU30243.

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Contrairement aux propulseurs chimiques servant à la mise à poste, les propulseurs électriques à courant de Hall sont des moteurs de petite taille utilisés pour le maintien à poste des satellites, le changement d'orbite et les missions interplanétaires. Souvent caractérisés par de faibles poussées, ils ont l'avantage d'avoir une vitesse d'éjection et une impulsion spécifique très importantes. Le principe de fonctionnement est basé sur l'ionisation d'un gaz rare (Xe, Kr) par une différence de potentiel appliquée au travers d'une barrière magnétique. La conductivité électronique localement plus

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Thabet, Hanen. "Validation de la chaîne d'émission pour la conception d'un capteur RF autonome." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4314.

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Ce travail s’inscrit dans un projet consistant à développer un prototype de capteur RF autonome et intelligent permettant la réalisation d’un réseau de capteurs sans fil dans un environnement industriel. Cette thèse traite de l’étude, la conception et la réalisation de la partie radiofréquence de la chaîne d’émission sans fils du capteur RF dans la bande ISM 863-870 MHz en technologie CMOS AMS 0.35µm. Cette chaîne inclut toutes les fonctions depuis l’oscillateur local jusqu’à l’amplificateur de puissance. L’émetteur occupe une surface de 0.22mm² et consomme environ 27mA sous une tension d’alim

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Jelena, Radić. "Ultra-širokopojasni impulsni generator u CMOS tehnologiji." Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2014. https://www.cris.uns.ac.rs/record.jsf?recordId=87520&source=NDLTD&language=en.

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Impulsni generator predstavlja jedan od najvažnijih delova bežičnogprimopredajnika. Pored toga što treba da generiše signal čijispektar zadovoljava odgovarajuću spektralnu masku, generator treba dabude što jednostavniji, zauzima malu površinu i ima malu potrošnju.Naučni doprinos ove doktorske disertacije predstavlja sedam novihkonfiguracija ultra-širokopojasnih impulsnih generatoraprojektovanih u CMOS tehnologiji, od kojih su tri fabrikovane u0,18 μm UMC CMOS procesu. Prvi dizajn je zasnovan na principukombinovanja kratkotrajnih impulsa, sledeća tri sadrže ringoscilator, naredna dva impulsn

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Aleksandar, Pajkanović. "Пројектовање и карактеризација индуктора и нискошумног појачавача у технологији монолитних интегрисаних кола за широкопојасне примене". Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2018. https://www.cris.uns.ac.rs/record.jsf?recordId=107143&source=NDLTD&language=en.

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Пасивна индуктивна компонента и нискошумни појачавач у технологијимонолитних интегрисаних кола за широкопојасне примјене пројектованису, фабриковани и карактерисани. Приликом пројектовања индуктораизабрана је топологија меандар, а осим софтверских алата запројектовање интегрисаних кола, кориштен је и симулаторелектромагнетског поља. Осим карактеризације основних параметара,пажња је посвећена и анализи процесних и температурских варијација.Спроведена је механичка карактеризација материјала од којег се састојизаштитни слој фабрикованог интегрисаног кола. Нискошумни појачавачпројектован је као пр

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Gibrat, Olivier. "Caractérisation expérimentale de transistors de puissance RF : conception d'un banc de mesure multiharmonique source pull et load-pull basé sur la technique six-portes /." Paris : École nationale supérieure des télécommunications, 2002. http://catalogue.bnf.fr/ark:/12148/cb38952229t.

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Gibrat, Olivier. "Caractérisation expérimentale de transistors de puissance RF : Conception d'un banc de mesure multiharmonique source pull et load-pull basé sur la technique des six-portes." Paris, ENST, 2002. http://www.theses.fr/2002ENST0005.

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Herceg, Erik. "Výkonový zesilovač pro pásmo 435MHz s vysokou účinností." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-316446.

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This diploma thesis is focused on design of high frequency power amplifiers in UHF band, specifically at 435 MHz. Amplifiers are designed in different classes of operation. The thesis deals with the comparison of main parameters in each class of operation, the most important parameter is effeciency. The amplifying part is unipolar transistor which is working in Single-stage mode. The results were simulated in Advanced Design Systems Software.

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46

Baltador, Carlo. "Numerical and experimental characterization of beams of negative ions and investigation on strategies for beam efficiency improvements." Doctoral thesis, Università degli studi di Padova, 2017. http://hdl.handle.net/11577/3425839.

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The research activity done during the three years Joint Doctorate in Fusion Science and Engineering was focused on negative ion sources and dedicated to numerical investigations of beam optics, experimental measurements and development of improvements for experimental devices. In particular, I carried out investigations on plasma source behavior and beam extraction under different operational conditions, paying special attention to beam optics improvement and co-extracted electron suppression efficiency, as well as analysing and developing solutions by means of numerical codes such as SLACCAD

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Hazami, Zahra. "Development of a solid state amplifier for the 3rd harmonic cavity for ALBA synchrotron light source." Doctoral thesis, Universitat Politècnica de Catalunya, 2020. http://hdl.handle.net/10803/668825.

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In Synchrotron Light Source facilities with high energy and low emittance electron beams different techniques for improving the quality of the synchrotron light for the users are applied. With this aim ALBA, the Spanish 3rd generation Synchrotron Light Source, is developing a 3rd Harmonic radiofrequency (RF) system as a system additional to the main RF system of the storage ring. This system will consist of four normal conducting active cavities at 1.5 GHz that will provide the required 1.1 MV accelerating voltage to the electron beam and will be fed by four 20 kW power transmitters. This pow

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Poulsen, Andrew Joseph. "Real-time Adaptive Cancellation of Satellite Interference in Radio Astronomy." Diss., CLICK HERE for online access, 2003. http://contentdm.lib.byu.edu/ETD/image/etd238.pdf.

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Gisbert, Rémy. "Optimisation d'une source d'ions à décharge luminsescente pour spectromètre de masse." Grenoble 1, 1992. http://www.theses.fr/1992GRE10118.

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La source d'ions a decharge luminescente en mode continu est utilisee en spectrometrie de masse car elle permet d'obtenir un signal intense, stable et peu discriminatoire. Nous avons etudie les differentes fonctions remplies par cette source (atomisation de l'echantillon et ionisation des produits re-emis) pour analyser son fonctionnement et l'optimiser. L'etude des processus successifs (etablissement et fonctionnement de l'auto-entretien, atomisation par pulverisation de l'echantillon, ionisation des atomes emis dans la decharge) nous a permis de montrer l'importance des parametres suivants:

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50

Bieber, Thomas. "Etude expérimentale d'une source plasma RF à configuration hélicon dans le mélange Ar/H2 : application à la gravure chimique de surfaces graphitiques dans le cadre des interactions plasma-paroi du divertor d'ITER." Thesis, Université de Lorraine, 2012. http://www.theses.fr/2012LORR0011/document.

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Les interactions plasma-paroi représentent l'un des principaux problèmes à résoudre pour avancer dans la recherche sur la fusion contrôlée. Ce travail de thèse a pour objectif de développer une source d'hydrogène atomique à basse pression (< Torr) dans un réacteur à configuration hélicon en mélange H2/Ar pour étudier la gravure chimique du graphite et de composites à fibres de carbone utilisés dans le tokamak Tore Supra. Selon les conditions expérimentales, le réacteur peut générer les modes de couplages capacitif, inductif, Trivelpiece-Gould et hélicon à bas champ. Leur caractérisation a m

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