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Letteratura scientifica selezionata sul tema "Robustesse en mode RF"

Autore: Grafiati

Pubblicato: 1 marzo 2025

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Articoli di riviste sul tema "Robustesse en mode RF"

Benabderrahman, Hossam Eddine, Rachid Taleb, M'hamed Helaimi e Fayçal Chabni. "Commande par mode glissant d’ordre deux d’un moteur asynchrone lié à un convertisseur multi-niveau asymétrique". Journal of Renewable Energies 21, n. 2 (30 giugno 2018): 267–78. http://dx.doi.org/10.54966/jreen.v21i2.687.

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Afin de pouvoir améliorer le rendement délivré à la charge, autrement dit la qualité de la tension de sortie des moyennes qui ont été utilisées parmi ces derniers: l'utilisation d'un onduleur multi-niveau au lieu de l'onduleur à deux niveaux, une seconde solution basée sur le choix de commande d'un moteur. Dans notre article, on a choisi la technique de commande par mode glissant d'ordre supérieure, cette commande conserve les mêmes performances de robustesse et de stabilité données par le mode glissant classique tout en réduisant le broutement.

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Djeriri, Youcef, e Zinelaabidine Boudjema. "Commande robuste par la logique floue et les réseaux de neurones artificiels de la GADA : étude comparative". Journal of Renewable Energies 20, n. 1 (12 ottobre 2023): 147–60. http://dx.doi.org/10.54966/jreen.v20i1.616.

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Cet article présente la commande de la machine asynchrone à double alimentation en mode génératrice (GADA) par des techniques de l'Intelligence Artificielle (IA), utilisée dans un système de conversion d'énergie éolienne à vitesse variable. Donc dans ce travail, on s’intéresse particulièrement à l’application de la commande vectorielle indirecte par orientation du flux statorique à la GADA, basée sur les régulateurs de l'intelligence artificielle, tels que la logique floue et les réseaux de neurones. Ces derniers surpassent les limites des techniques classiques et possèdent des caractéristiques essentielles pour l'amélioration de la robustesse de la commande vectorielle. Des résultats de simulation sous Matlab/Simulink sontdonnés afin de comparer les performances des deux régulateurs dans le contrôle de la GADA.

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Gao, Yuan. "The Effect of Online and Offline Sports Safety Education combined with MOOC Platforms in Physical Education Teaching in Colleges and Universities". Scalable Computing: Practice and Experience 24, n. 3 (10 settembre 2023): 585–96. http://dx.doi.org/10.12694/scpe.v24i3.2285.

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In light of Internet+, how to make network technology better serve the educational cause needs more exploration. The online and offline hybrid education model that integrates MOOC is a new attempt. The sports safety of college students is the premise for the smooth development of sports activities. Therefore, a mixed teaching mode of sports safety combined with MOOC is designed to evaluate the teaching effect. However, under this teaching mode, the commonly used teaching effect evaluation methods cannot adhere to formative evaluation standards. Consequently, to better evaluate the MOOC teaching mode, a model for evaluating instructional effects based on RF mixed teaching mode is constructed. Aiming at the defects of RF in data processing, a genetic algorithm and particle swarm algorithm are used to optimize random forest. The outcomes demonstrate that the enhanced PSO-RF evaluation model has a 98.68% accuracy rate, which is 5.44% and 3.49% higher than the RF and GA-RF model respectively. Therefore, the enhanced PSO-RF-based teaching effect assessment model can better assess the mixed teaching mode in sports safety, meeting the evaluation requirements for students’ learning effects.

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Pugliese, Giovanni, Felix Piel, Phillip Trefz, Philipp Sulzer, Jochen K. Schubert e Wolfram Miekisch. "Effects of modular ion-funnel technology onto analysis of breath VOCs by means of real-time mass spectrometry". Analytical and Bioanalytical Chemistry 412, n. 26 (13 agosto 2020): 7131–40. http://dx.doi.org/10.1007/s00216-020-02846-8.

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Abstract Proton transfer reaction time-of-flight mass spectrometry (PTR-ToF-MS) is a powerful tool for real-time monitoring of trace concentrations of volatile organic compounds (VOCs). The sensitivity of PTR-ToF-MS also depends on the ability to effectively focus and transmit ions from the relatively high-pressure drift tube (DT) to the low-pressure mass analyzer. In the present study, a modular ion-funnel (IF) is placed adjacent to the DT of a PTR-ToF-MS instrument to improve the ion-focusing. IF consists of a series of electrodes with gradually decreasing orifice diameters. Radio frequency (RF) voltage and direct current (DC) electric field are then applied to the electrodes to get the ions focused. We investigated the effect of the RF voltage and DC field on the sensitivity of a pattern of VOCs including hydrocarbons, alcohols, aldehydes, ketones, and aromatic compounds. In a proof-of-concept study, the instrument operating both as normal DT (DC-mode) and at optimal IF conditions (RF-mode) was applied for the breath analysis of 21 healthy human subjects. For the range of investigated VOCs, an improvement of one order of magnitude in sensitivity was observed in RF-mode compared with DC-mode. Limits of detection could be improved by a factor of 2–4 in RF-mode compared with DC-mode. Operating the instrument in RF-mode allowed the detection of more compounds in the exhaled air compared with DC-mode. Incorporation of the IF considerably improved the performance of PTR-ToF-MS allowing the real-time monitoring of a larger number of potential breath biomarkers.

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FERRARIO, MASSIMO, e CONCETTA RONSIVALLE. "RESONANT MODES IN A 1.6 CELLS RF GUN". International Journal of Modern Physics A 22, n. 23 (20 settembre 2007): 4204–13. http://dx.doi.org/10.1142/s0217751x07037767.

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The SPARC photoinjector RF gun consists in the BNL/SLAC/UCLA 1.6 cell structure designed to resonate at 2856 MHz in the π mode. It will be demonstrated by a numerical modelization based on SUPERFISH code combined with the LC-circuit analysis that the two oscillating modes of the system usually indicated as 0-mode and π-mode (the operating mode) are in reality a π/3-mode-like and a π-mode-like. The consequences on the definition of the coupling coefficient and on the use of mode-separation based RF measurements are described.

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Ma, Minglin, e Zhijun Li. "All Current Mode RF Receiver Front End". IETE Journal of Research 58, n. 6 (2012): 441. http://dx.doi.org/10.4103/0377-2063.106735.

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Lisovskiy, V., J.-P. Booth, K. Landry, D. Douai, V. Cassagne e V. Yegorenkov. "Rf discharge dissociative mode in NF3and SiH4". Journal of Physics D: Applied Physics 40, n. 21 (19 ottobre 2007): 6631–40. http://dx.doi.org/10.1088/0022-3727/40/21/023.

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Jin, S., N. J. Fisch e A. H. Reiman. "Pulsed RF schemes for tearing mode stabilization". Physics of Plasmas 27, n. 6 (giugno 2020): 062508. http://dx.doi.org/10.1063/5.0007861.

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KAUP, D. J., J. O. EL-REEDY e GARY E. THOMAS. "Parametric interactions inside a magnetron". Journal of Plasma Physics 64, n. 4 (ottobre 2000): 489–506. http://dx.doi.org/10.1017/s0022377800008783.

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The purpose of this work is to understand theoretically what are the possible noise levels in a magnetron or a crossed-field amplifier (CFA), due to parametric three-wave interactions in the electron plasma, at various operating parameters. Our approach is to use the cold-fluid equations and their Fourier decomposition into a background (DC) mode, a pump (RF) mode, and two other noise (RF) modes. The two RF noise modes are assumed to interact parametrically with the large RF pump mode, and to satisfy the standard resonance conditions for the sum of the wave vectors and sum of the frequencies. We use our previous results to determine the background mode and the RF pump mode. Any strong RF electric field propagating in a crossed-field electron vacuum device can drive a Brillouin sheath unstable by means of a Rayleigh instability, whenever a wave–particle resonance can be found inside the sheath. What happens physically is that, at the resonance, the laminar flow of the electrons is strongly disturbed, and a diffusion process ensues, whereby the electrons diffuse away from the resonance region. This upsets the balance in the Brillouin flow, causing the electrons to redistribute into a new average DC density profile – which may be far from the original Brillouin profile, but is a stationary solution of a nonlinear diffusion equation. Using these stationary density profiles, we can then study the propagation of small RF signals on such a DC background, as well as their parametric interactions with the RF pump wave, at various DC voltages and magnetic fields. In addition to being able to predict the operating regime and the DC current flow, these studies demonstrate that parametric interactions probably limit the operating voltage range of a typical magnetron or crossed-field amplifier to about 20% above the Hartree voltage.

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SCHMERGE, J. F., J. CASTRO, J. E. CLENDENIN, D. H. DOWELL, S. M. GIERMAN e H. LOOS. "THE S-BAND 1.6 CELL RF GUN CORRELATED ENERGY SPREAD DEPENDENCE ON π AND 0 MODE RELATIVE AMPLITUDE". International Journal of Modern Physics A 22, n. 23 (20 settembre 2007): 4061–68. http://dx.doi.org/10.1142/s0217751x07037639.

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The π mode or accelerating mode in a 1.6 cell rf gun is normally the only mode considered in rf gun simulations. However, due to the finite Q there is a small but measurable 0 mode present even at steady state. The π mode by definition has a 180° phase shift between cells but this phase shift for the total field is several degrees different. This results in a correlated energy spread exiting the gun. A comparison of simulation and experiment will be shown.

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Più fonti

Tesi sul tema "Robustesse en mode RF"

Said, Nasri. "Evaluation de la robustesse des technologies HEMTs GaN à barrière AlN ultrafine pour l'amplification de puissance au-delà de la bande Ka". Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0425.

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La filière GaN est stratégique pour l'Union Européenne car elle permet d'améliorer la puissance et le rendement des systèmes radar et de télécommunication, notamment dans les bandes S à Ka (jusqu'à 30 GHz). Pour répondre aux besoins des futures applications, telles que la 5G et les systèmes militaires, le développement des technologies GaN vise à augmenter les fréquences jusqu'aux ondes millimétriques. Cela nécessite d'optimiser l'épitaxie et la réduction de la longueur de grille à moins de 150 nm, ainsi que l'utilisation de barrières ultrafines (<10 nm) pour éviter les effets de canaux courts. La substitution de la barrière AlGaN par du AlN représente une solution pour maintenir de bonnes performances tout en miniaturisant les composants. Dans ces travaux de thèse, plusieurs variantes technologiques à barrière AlN ultrafine (3 nm) sur des canaux GaN non-dopés de différentes épaisseurs, développées par le laboratoire IEMN sont étudiés. L'évaluation des performances et de la robustesse de ces technologies, cruciale pour leur qualification et utilisation dans des missions à long-terme, sont ainsi menées en mode DC et RF afin de définir les zones de sécurité de fonctionnement (SOA) et d’identifier les mécanismes de dégradation.La campagne de caractérisation DC et pulsée a révélé une faible dispersion des composants après leur stabilisation électrique, reflétant une bonne maîtrise technologique : ceci permet par ailleurs des études statistiques et des analyses génériques plus pertinentes sur l’ensemble des lots de composants étudiés. L'analyse de la sensibilité des dispositifs à des températures allant jusqu'à 200°C a prouvé la forte stabilité thermique des performances en mode diode et transistor, en suivant les indicateurs paramétriques représentatifs des modèles électriques des composants (courants de saturation et courants de fuite, tension de seuil, taux de retard aux commandes entrée sortie, …). L’ajout d’une barrière arrière AlGaN sur une couche tampon moyennement dopée C a réglé le compromis entre confinement des électrons et densités de pièges. Les tests de vieillissement accéléré en mode DC à différents points de polarisation et en mode RF par paliers de puissance d’entrée ont montré que la barrière arrière AlGaN confère une meilleure stabilité des courants de fuite et des courbes I(V) statiques, une réduction des effets de piégeage et d'auto-échauffement, ainsi qu'une extension de la SOA-DC opérationnelle. Les tests de vieillissement accéléré en mode dynamique à 10 GHz sur des HEMTs avec différents espacements grille-drain ont montré que la SOA-RF ne dépend pas de cet espacement, mais plutôt de la capacité de la grille à supporter des signaux RF élevés, avant dégradation brutale de cette dernière. En utilisant une méthode de modélisation non linéaire originale, prenant en compte le phénomène d'auto-polarisation, les dispositifs avec barrière AlGaN se sont révélés plus robustes également en RF. Cela se traduit par leur compression plus tardive de gain, allant jusqu’à +10dB et sans dégradation électrique ainsi que structurelle apparente (observée par photoluminescence). Indépendamment de la variante AlN/GaN, le mécanisme de dégradation en stress RF correspond au claquage abrupt de la grille Schottky conduisant à sa défaillance. Ces résultats prouvent que les composants sont plus sensibles aux conditions de polarisation DC qu’au niveau de signal RF injecté [...]
The GaN industry is strategic for the European Union because it enhances the power and efficiency of radar and telecommunication systems, especially in the S to Ka bands (up to 30 GHz). To meet the needs of future applications such as 5G and military systems, GaN technology development aims to increase frequencies to the millimeter-wave range. This requires optimizing epitaxy and reducing the gate length to less than 150 nm, as well as using ultrathin barriers (<10 nm) to avoid short-channel effects. Replacing the AlGaN barrier with AlN is a solution to maintain good performance while miniaturizing devices. In this thesis, several technological variants with an ultrathin AlN barrier (3 nm) on undoped GaN channels of various thicknesses, developed by the IEMN laboratory, are studied. The evaluation of the performance and robustness of these technologies, crucial for their qualification and use in long-term profil missions, is conducted in both DC and RF modes to define the safe operating areas (SOA) and identify degradation mechanisms.The DC and pulsed characterization campaign revealed low component dispersion after electrical stabilization, reflecting good technological control. This also allows for more relevant statistical studies and generic analyses across all component batches studied. The sensitivity analysis of the devices at temperatures up to 200°C demonstrated strong thermal stability in diode and transistor modes, following parametric indicators representative of the electrical models of the components (saturation currents and leakage currents, threshold voltage, gate and drain lags rates, ...). The addition of a AlGaN back-barrier on a moderately C-doped buffer layer resolved the trade-off between electron confinement and trap densities. Accelerated aging tests in DC mode at various biasing conditions and in RF mode by input power steps showed that the AlGaN back-barrier provides better stability in leakage currents and static I(V) curves, reduces trapping and self-heating effects, and extends the operational DC-SOA.Dynamic accelerated aging tests at 10 GHz on HEMTs with different gate-drain spacings showed that the RF-SOA does not depend on this spacing but rather on the gate's ability to withstand high RF signals before abrupt degradation occurs. Using an original nonlinear modeling method that considers the self-biasing phenomenon, devices with the AlGaN back-barrier proved to be more robust in RF as well. This is reflected in their later gain compression, up to +10 dB, without apparent electrical or structural degradation (as observed by photoluminescence). Regardless of the AlN/GaN variant, the RF stress degradation mechanism corresponds to the abrupt breakdown of the Schottky gate, leading to its failure. These results indicate that the components are more sensitive to DC bias conditions than to the level of injected RF signals [...]

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Wu, Yichao. "RF circuit applications of enhancement-mode AlGaN/GaN HEMTs /". View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?ECED%202007%20WUY.

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Hill, C. A. "Mode control and tunability in Rf-excited CO2Ì² waveguide lasers". Thesis, University of Hull, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381878.

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Ren, Jing. "From RF signals to B-mode Images Using Deep Learning". Thesis, KTH, Medicinteknik och hälsosystem, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-235061.

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Ultrasound imaging is a safe and popular imaging technique that relies on received radio frequency (RF) echos to show the internal organs and tissue. B-mode (Brightness mode) is the typical mode of ultrasound images generated from RF signals. In practice, the real processing algorithms from RF signals to B-mode images in ultrasound machines are kept confidential by the manufacturers. The thesis aims to estimate the process and reproduce the same results as the Ultrasonix One ultrasound machine does using deep learning. 11 scalar parameters including global gain, time-gain-compensation (TGC1-8), dynamic range and reject affect the transformation from RF signals to B-mode images in the machine. Data generation strategy was proposed. Two network architectures adapted from U-Net and Tiramisu Net were investigated and compared. Results show that a deep learning network is able to translate RF signals to B-mode images with respect to the controlling parameters. The best performance is achieved by adapted U-Net that reduces per pixel error to 1.325%. The trained model can be used to generate images for other experiments.

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van, Zyl Willem Francois. "Development of an RF listening mode on the TIGER-3 FPGA platform". Master's thesis, Faculty of Engineering and the Built Environment, 2021. http://hdl.handle.net/11427/33097.

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High frequency (HF) radars have many critical applications due to the effects that physical media have on the wave's propagation. The diffraction of HF radio waves in the ionosphere allows for long range communication and radar operation. Waves travel over the horizon where they may be reflected off large scatterers such as ships, or monitor sea states over large oceanic surface areas. Furthermore, the ionosphere provides key information on solar weather. Monitoring RF reflections from the ionosphere (specifically at the polar regions) is of great importance to the scientific community. The use of the HF (3-30 Mhz) has been greatly simplified for radar transceivers in recent decades. Digital hardware can sample and process information fast enough to eliminate the need for conventional analogue down-converters. The result is an increase in sensitivity, signal to noise ratio and design simplicity. The primary advantage of digital radars is versatility. The ability to change parameters and even modes of operation means that digital radars have become more common, and have replaced or been partly integrated into most of their analogue counterparts. The SuperDARN is a network of ionosphere monitoring radars that have been in operation since the 1980s. Since its inception it has undergone multiple improvements and served the scientific community well. The 4th South African National Arctic Expedition (SANAE IV) makes use of a digital radar platform based on the third generation TIGER-3 FPGA boards. The highly adaptable nature of the transceivers provide a host of secondary applications and improvements to its analogue predecessors. The system is however not in a state that supports further development. Currently the system is programmed for a set mode of operation without access to the source software. This work details the design and implementation process followed to bring the TIGER-3 system to a state that will support further development. In this state, peripheral interfaces are designed and implemented to allow for a listening mode of operation. In this mode, the radar samples a signal from an antenna and effectively communicates the data to a personal computer via an Ethernet link. To achieve these outcomes; FPGA code (written in Verilog) was developed to implement IQ downconversion, digital filtering, and a client interface for the Ethernet link. The features were tested by recording and analysing digital outputs from the platform, and finally, by recording signal information obtained through the Ethernet interface. Supporting literature will lay the groundwork for future projects to build on the base layer implementation; with the hope of redesigning the current SuperDARN implementation in the future. Further improvements to the current system could include a range of scanning patters and multi-frequency operation.

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Tossoun, Bassem M. "Hybrid Silicon Mode-Locked Laser with Improved RF Power by Impedance Matching". DigitalCommons@CalPoly, 2014. https://digitalcommons.calpoly.edu/theses/1314.

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The mode-locked laser diode (MLLD) finds a lot of use in applications such as ultra high-speed data processing and sampling, large-capacity optical fiber communications based on optical time-division multiplexing (OTDM) systems. Integrating mode-locked lasers on silicon makes way for highly integrated silicon based photonic communication devices. The mode-locked laser being used in this thesis was built with Hybrid Silicon technology. This technology, developed by UC Santa Barbara in 2006, introduced the idea of wafer bonding a crystalline III- V layer to a Silicon-on-insulator (SOI) substrate, making integrated lasers in silicon chips possible. Furthermore, all mode-locked lasers produce phase noise, which can be a limiting factor in the performance of optical communication systems, specifically at higher bit rates. In this thesis, we design and discuss an impedance matching solution for a hybrid silicon mode-locked laser diode to lower phase noise and reduce the drive power requirements of the device. In order to develop an impedance matching solution, a thorough measurement and analysis of the impedance of the MLLD is necessary and was carried out. Then, a narrowband solution of two 0.1 pF chip capacitors in parallel is considered and examined as an impedance matching network for an operating frequency of 20 GHz. The hybrid silicon laser was packaged together in a module including the impedance- matching circuit for efficient RF injection. In conclusion, a 6 dB reduction of power required to drive the laser diode, as well as approximately a 10 dB phase noise improvement, was measured with the narrow-band solution. Also, looking ahead to possible future work, we discuss a step recovery diode (SRD) driven impulse generator, which wave-shapes the RF drive to achieve efficient injection. This novel technique takes into account the time varying impedance of the absorber as the optical pulse passes through it, to provide optimum pulse shaping.

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Benalia, Atallah. "Contribution à la modélisation et la commande robuste du confort thermique au sein d'un habitacle automobile". Paris 11, 2004. http://www.theses.fr/2004PA112016.

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L'étude que nous présentons ici, se situe dans le cadre d'un projet lancé au sein de Valeo et qui porte sur la modélisation et la commande du confort thermique des passagers d'un habitacle automobile. Les problèmes auxquels nous nous intéressons sont décrits comme suit: -La modélisation: pour la conception des commandes avancées robustes assurants le suivi des trajectoires, il nous faut des modèles simples pour aboutir à des commandes implémentables et assez précis pour avoir une bonne estimation du confort thermique. La commande: à partir des modèles développés dans la première partie, concevoir des commandes garantissant le suivi des trajectoires et suffisamment robustes par rapport aux variations paramétriques. La première partie de cette thèse porte sur la modélisation du confort thermique des passagers dans l'habitacle automobile. Pour aboutir à cette estimation à partir des grandeurs mesurées, nous avons associer, à ce modèle, un modèle aéraulique et thermique de l'appareil de climatisation ainsi qu'un modèle thermique (dynamique) de l'habitacle automobile. La deuxième partie est à la fois une contribution à la commande des systèmes non linéaires soumis à des saturations des entrées et une application de l'automatique moderne pour la commande robuste du confort thermique des passagers. Dans un premier temps, nous avons développé une nouvelle méthode permettant de générer et de suivre les trajectoires des systèmes non linéaires dont les entrées sont limitées. L'idée de base est de reparametrer le temps de plannification pour répondre aux contraintes de la commande. Nous avons montré dans ce cadre que la génération de trajectoires des systèmes non linéaires sous contraintes sur les entrées est transformée en la résolution d'un système linéaire contraint. Dans un deuxième temps, nous avons développé trois types de commandes du confort thermique des passagers: la commande linéarisante entrée-état, la commande Backstepping et la commande par mode glissant. Nous avons constaté que la commande linéarisante entrée-état ne présente pas des propriétés de robustesse par rapport aux variations paramétriques. Les deux autres type de commande présentent de très bonnes propriétés de robustesses. Néanmoins, la commande à mode glissant présente l'avantage d'être plus simple et donc plus adapté pour l'implémentation en temps réel
The study which we present, here, is within the framework of a project launched within Valeo and which Concern the modelling and the control of the thermal comfort of the passengers of a car cockpit. The problems in witch we are interested are described folows : -The modelling: for the conception of advanced controls asssuring the task of tracking the trajectory, we need, on the one hand, simple models to have a simple control and, on the other hand, good models to have a good estimation of the thermal control. -The control: from the models developed in the first part, we develop controls who insure the trajectory tracking in the présence of parametric errors. The first part of this thesis concerns the modelization of the thermal comfort inside the car cockpit. To achieve the comfort estimation only from the measurements, we have associated to the comfort model an aerothermic models of the HVAC and a dynamic thermal model of the car cockpit. The second part is at the same time a contribution to the control of nonlinear systems subject to inputs saturation and an application of modern controls to achieve a robust trajectory tracking of the thermal comfort. At first, we developed a new method to generate and track trajectories of nonlinear systems subject to inputs constraints. The basic idea is to change the time parametrization. We show, in this case, that the generation of the trajectory is equivalent to solving a linear systems subject to input constraints. In a second time, we developed three kinds of controls in order to achieve the comfort trajectory tracking : input to state linearization, backstepping and sliding mode. We observes in this study that the input to state linearization method is not robust to parameter variations. The two other type of control presented very good robustness properties. However, the sliding mode has the advantage to be more simple and more adapted for real time implementation

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Reyss, Olivier. "Stratégies de contrôle embarquables d'un groupe moto-propulseur hybride de type bi-mode". Phd thesis, Université Paris Sud - Paris XI, 2008. http://tel.archives-ouvertes.fr/tel-00345795.

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Abstract (sommario):

Ces dernières années ont vu le marché automobile évoluer de manière importante, chahuté par un ensemble de contraintes géopolitiques et environnementales nouvelles, dont la principale est la nécessité de réduire les émissions de gaz à effet de serre. Une des solutions à moyen terme les plus prometteuses pour répondre à ce problème est l'hybridation des groupes moto-propulseurs. La complexification des transmissions alors engendrée pose des problèmes de contrôle dont les points clés sont : la rapidité des suivis du couple à la roue, du régime moteur et de la tension de l'élément de stockage dans un cadre multivariable, le découplage de ces suivis et la robustesse de la loi de commande face à un certain nombre de perturbations identifiées et aux non-linéarités. Un outil moderne répond à ces attentes, en proposant une approche fréquentielle, qui permet donc la traduction d'un cahier des charges précis : la synthèse H1. Dans cette thèse, nous poserons tout d'abord le contexte du marché automobile actuel, et nous déterminerons un modèle générique pour un ensemble de transmissions hybrides. Deux axes seront alors étudiés indépendamment. D'une part, nous présenterons une structure de loi de commande avantageuse reprenant l'approche moteur / boîte de vitesse que l'on retrouve dans un véhicule classique. D'autre part, nous mettrons en relief le fait que le système, bien que non linéaire, peut être abordé dans le cadre des systèmes linéaires à paramètres variants (LPV). Deux approches sont alors possibles : synthétiser un correcteur linéaire invariant, ou un correcteur également LPV. Pour faire ce choix nous mettrons en place plusieurs outils d'analyse, adaptés au cadre LPV, et réaliserons des simulations significatives. Dans le but d'implanter la loi de commande choisie dans un véhicule d'essais, une architecture logicielle sera alors définie, assurant la discrétisation et la bonne initialisation du correcteur. Les résultats obtenus sur prototype montrent que les outils utilisés sont bien adaptés aux transmissions hybrides, et qu'ils permettent un réglage fin des objectifs du cahier des charges.

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Wang, Ruonan. "Enhancement/depletion-mode HEMT technology for III-nitride mixed-signal and RF applications /". View abstract or full-text, 2008. http://library.ust.hk/cgi/db/thesis.pl?ECED%202008%20WANG.

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Razzak, M. Abdur, Shuichi Takamura e Yoshihiko Uesugi. "Dynamics of E-H mode transition in high-pressure RF inductively coupled plasmas". IEEE, 2005. http://hdl.handle.net/2237/6794.

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Libri sul tema "Robustesse en mode RF"

Tunmann, Ernest O. Practical multiservice LANs: ATM and RF broadband. Boston: Artech House, 1999.

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Kuisma, Mikko. Minimizing conducted RF-emissions in switch mode power supplies using spread-spectrum techniques. Lappeenranta: Lappeenranta University of Technology, 2004.

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Yŏnʼguwŏn, Hanʼguk Chŏnja Tʻongsin, a cura di. Tajung modŭ SDR tanmaryong dijitʻŏl RF mit ADC chʻip kaebal =: Development of digital RF and ADC chips for multi-mode SDR terminal. [Kyŏnggi-do Sŏngnam-si]: Chŏngbo Tʻongsinbu, 2007.

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Hueber, Gernot, e Robert Bogdan Staszewski. Multi-mode/multi-band RF transceivers for wireless communications: Advanced techniques, architectures, and trends. New York: Wiley, 2010.

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1972-, Hueber Gernot, e Staszewski Robert Bogdan 1965-, a cura di. Multi-mode/multi-band RF transceivers for wireless communications: Advanced techniques, architectures, and trends. New York: Wiley, 2010.

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Workshop of Advances in Analogue Circuit Design (11th 2002 Spa, Belgium). Analog circuit design: Structured mixed-mode design, multi-bit sigma-delta converters, short range RF circuits. Boston: Kluwer Academic Publishers, 2002.

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Huijsing, Johan. Analog Circuit Design: Volt Electronics; Mixed-Mode Systems; Low-Noise and RF Power Amplifiers for Telecommunication. Boston, MA: Springer US, 1999.

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1938-, Huijsing Johan H., Plassche Rudy van de, Sansen Willy M. C e Workshop of Advances in Analogue Circuit Design (7th : 1998 Copenhagen, Denmark), a cura di. Analog circuit design: Volt electronics, mixed-mode systems, low-noise and RF power amplifiers for telecommunication. Boston, Mass: Kluwer Academic Publishers, 1999.

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Sjöland, Henrik. Highly linear integrated wideband amplifiers: Design and analysis techniques for frequencies from audio to RF. Boston: Kluwer Academic Publishers, 1999.

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Capitoli di libri sul tema "Robustesse en mode RF"

Gallegos, Augusto, Philippe Silvestre, Michel Robert e Daniel Auvergne. "RF Interface Design Using Mixed Mode Methodology". In VLSI: Systems on a Chip, 326–33. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/978-0-387-35498-9_29.

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Tasic, Aleksandar. "Adaptive Multi-Mode RF Front-End Circuits". In Multi-Mode/Multi-Band RF Transceivers for Wireless Communications, 65–83. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470634455.ch3.

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Seabra, José, e João Miguel Sanches. "RF Ultrasound Estimation from B-Mode Images". In Ultrasound Imaging, 3–24. Boston, MA: Springer US, 2011. http://dx.doi.org/10.1007/978-1-4614-1180-2_1.

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Winoto, Renaldi, e Borivoje Nikolić. "Discrete-Time Processing of RF Signals". In Multi-Mode/Multi-Band RF Transceivers for Wireless Communications, 219–45. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470634455.ch8.

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Reynaert, Patrick. "CMOS RF Power Amplifiers for Mobile Communications". In Multi-Mode/Multi-Band RF Transceivers for Wireless Communications, 377–410. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470634455.ch13.

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Dawson, Joel L. "Digitally Assisted RF Architectures: Two Illustrative Designs". In Multi-Mode/Multi-Band RF Transceivers for Wireless Communications, 411–49. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470634455.ch14.

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Valkama, Mikko. "RF Impairment Compensation for Future Radio Systems". In Multi-Mode/Multi-Band RF Transceivers for Wireless Communications, 451–96. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470634455.ch15.

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Keehr, Edward A., e Ali Hajimiri. "Digitally Enhanced Alternate Path Linearization of RF Receivers". In Multi-Mode/Multi-Band RF Transceivers for Wireless Communications, 309–45. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470634455.ch11.

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Darabi, Hooman. "Overview of Front-End RF Passive Integration into SoCs". In Multi-Mode/Multi-Band RF Transceivers for Wireless Communications, 113–58. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470634455.ch5.

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Wilson, P. B. "Fundamental-mode rf design in e + e − storage ring factories". In Lecture Notes in Physics, 293–311. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/3540565884_16.

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Atti di convegni sul tema "Robustesse en mode RF"

Lexlin Dong, Jason Shao e Nina Huang. "RF solution with pingpong test mode". In 2015 China Semiconductor Technology International Conference (CSTIC). IEEE, 2015. http://dx.doi.org/10.1109/cstic.2015.7153466.

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Wei, Chongyu, Youjun Gu, Wenlin Yang e Yong Li. "RF Design of Simultaneous Dual-Mode Mobiles". In 2008 4th International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM). IEEE, 2008. http://dx.doi.org/10.1109/wicom.2008.553.

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"Session 8 Analog, mixed mode, and RF". In 2004 IEEE International SOI Conference. IEEE, 2004. http://dx.doi.org/10.1109/soi.2004.1391600.

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Piazza, Gianluca. "Contour-Mode Aluminum Nitride Vibrating RF Microsystems". In 2007 IEEE International Frequency Control Symposium Joint with the 21st European Frequency and Time Forum. IEEE, 2007. http://dx.doi.org/10.1109/freq.2007.4319297.

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Serdyuk, G., e B. Shelkovnikov. "Mixed-mode Simulation of RF Communication Link". In 7th International Conference on Telecommunications in Modern Satellite Cable and Broadcasting Services. IEEE, 2005. http://dx.doi.org/10.1109/telsks.2005.1572151.

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Piazza, Gianluca, Philip Stephanou e Albert Pisano. "Aluminum Nitride Contour-Mode Vibrating RF MEMS". In 2006 IEEE MTT-S International Microwave Symposium Digest. IEEE, 2006. http://dx.doi.org/10.1109/mwsym.2006.249702.

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Bo Shi e Michael Yan Wah Chia. "Switching-mode linear RF power amplifier system". In 2008 IEEE MTT-S International Microwave Symposium Digest - MTT 2008. IEEE, 2008. http://dx.doi.org/10.1109/mwsym.2008.4633108.

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Ilchenko, V., J. Byrd, A. Savchenkov, P. Koonath, A. Matsko, D. Seidel e L. Maleki. "Whispering-gallery mode based photonic RF receiver". In 2010 IEEE/MTT-S International Microwave Symposium - MTT 2010. IEEE, 2010. http://dx.doi.org/10.1109/mwsym.2010.5516651.

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Ilchenko, V. S., J. Byrd, A. A. Savchenkov, P. Koonath, A. B. Matsko, D. Seidel e L. Maleki. "Whispering-gallery mode based photonic RF receiver". In 2010 IEEE/MTT-S International Microwave Symposium - MTT 2010. IEEE, 2010. http://dx.doi.org/10.1109/mwsym.2010.5516839.

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Nusinovich, Gregory S. "Mode Coupling in Sheet-Beam Klystrons". In HIGH ENERGY DENSITY AND HIGH POWER RF: 7th Workshop on High Energy Density and High Power RF. AIP, 2006. http://dx.doi.org/10.1063/1.2158765.

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Rapporti di organizzazioni sul tema "Robustesse en mode RF"

and Rainer Wanzenberg, Michael. RF design of a transverse mode cavity for kaon separation. Office of Scientific and Technical Information (OSTI), maggio 2001. http://dx.doi.org/10.2172/780614.

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Yeremian, A. Dian. Choke Flange for High Power RF Components Excited by TE01 Mode. Office of Scientific and Technical Information (OSTI), dicembre 2009. http://dx.doi.org/10.2172/969245.

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Kang, Y. W. Fundamental mode rf power dissipated in a waveguide attached to an accelerating cavity. Office of Scientific and Technical Information (OSTI), febbraio 1993. http://dx.doi.org/10.2172/10149756.

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Loewen, Roderick J. High Power Testing Results of the X-band Mixed-mode RF Windows for Linear Colliders. Office of Scientific and Technical Information (OSTI), ottobre 2000. http://dx.doi.org/10.2172/784752.

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Jason, Andrew J. First-order beam dynamics and RF parameters for the PSR short-bunch ("pulse-stacking") mode. Office of Scientific and Technical Information (OSTI), gennaio 2013. http://dx.doi.org/10.2172/1060895.

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Medley, S. S. ,. PPPL. Operation of the TFTR Pellet Charge Exchange Diagnostic in the Pulse Counting Mode during H+ RF-minority Heating. Office of Scientific and Technical Information (OSTI), maggio 1998. http://dx.doi.org/10.2172/289901.

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Byrd, John, John Corlett, Larry Doolittle, William Fawley, Steven Lidia, Gregory Penn, Alex Ratti et al. R&D Requirements, RF Gun Mode Studies, FEL-2 Steady-StateStudies, Preliminary FEL-1 Time-Dependent Studies, and Preliminary LayoutOption Investigation. Office of Scientific and Technical Information (OSTI), ottobre 2005. http://dx.doi.org/10.2172/883785.

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Li, Yuan, Benjamin Metcalf, Sopio Chochua, Zhongya Li, Robert Gertz, Hollis Walker, Paulina Hawkins, Theresa Tran, Lesley McGee e Bernard W. Beall. Validation of β-lactam minimum inhibitory concentration predictions for pneumococcal isolates with newly encountered penicillin binding protein (PBP) sequences [Supporting data]. Centers for Disease Control and Prevention (U.S.), novembre 2017. http://dx.doi.org/10.15620/cdc/147467.

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Abstract (sommario):

The datafiles, R scripts, MIC tables, and other files were used to evaluate the prediction performance of a penicillin-binding protein (PBP) typing system and two methods (Random Forest (RF) and Mode MIC (MM) previously developed by this research team. This data and these files support the finding of the paper "Validation of β-lactam minimum inhibitory concentration predictions for pneumococcal isolates with newly encountered penicillin binding protein (PBP) sequences" at https://doi.org/10.1186%2Fs12864-017-4017-7 or at https://stacks.cdc.gov/view/cdc/47684.

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Weinberg, Zwi G., Richard E. Muck, Nathan Gollop, Gilad Ashbell, Paul J. Weimer e Limin Kung, Jr. effect of lactic acid bacteria silage inoculants on the ruminal ecosystem, fiber digestibility and animal performance. United States Department of Agriculture, settembre 2003. http://dx.doi.org/10.32747/2003.7587222.bard.

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Abstract (sommario):

The overall objective of the whole research was to elucidate the mechanisms by which LAB silage inoculants enhance ruminant performance. The results generated will permit the development of better silage inoculants that maximize both silage preservation and animal performance. For this one-year BARD feasibility study, the objectives were to: 1. determine whether lactic acid bacteria (LAB) used in inoculants for silage can survive in rumen fluid (RF) 2.select the inoculants that survived best, and 3. test whether LAB silage inoculants produce bacteriocins-like substances. The most promising strains will be used in the next steps of the research. Silage inoculants containing LAB are used in order to improve forage preservation efficiency. In addition, silage inoculants enhance animal performance in many cases. This includes improvements in feed intake, liveweight gain and milk production in 25-40% of studies reviewed. The cause for the improvement in animal performance is not clear but appears to be other than direct effect of LAB inoculants on silage fermentation. Results from various studies suggest a possible probiotic effect. Our hypothesis is that specific LAB strains interact with rumen microorganisms which results in enhanced rumen functionality and animal performance. The first step of the research is to determine whether LAB of silage inoculants survive in RF. Silage inoculants (12 in the U.S. and 10 in Israel) were added to clarified and strained RF. Inoculation rate was 10 ⁶ (clarified RF), 10⁷ (strained RF) (in the U.S.) and 10⁷, 10⁸ CFU ml⁻¹ in Israel (strained RF). The inoculated RF was incubated for 72 and 96 h at 39°C, with and without 5 g 1⁻¹ glucose. Changes in pH, LAB numbers and fermentation products were monitored throughout the incubation period. The results indicated that LAB silage inoculants can survive in RF. The inoculants with the highest counts after 72 h incubation in rumen fluid were Lactobacillus plantarum MTD1 and a L. plantarum/P. cerevisiae mixture (USA) and Enterococcus faecium strains and Lactobacillus buchneri (Israel). Incubation of rumen fluid with silage LAB inoculants resulted in higher pH values in most cases as compared with that of un-inoculated controls. The magnitude of the effect varied among inoculants and typically was enhanced with the inoculants that survived best. This might suggest the mode of action of LAB silage inoculants in the rumen as higher pH enhances fibrolytic microorganisms in the rumen. Volatile fatty acid (VFA) concentrations in the inoculated RF tended to be lower than in the control RF after incubation. However, L. plalltarull1 MTDI resulted in the highest concentrations of VFA in the RF relative to other inoculants. The implication of this result is not as yet clear. In previous research by others, feeding silages which were inoculated with this strain consistently enhanced animal performance. These finding were recently published in Weinberg et.al.. (2003), J. of Applied Microbiology 94:1066-1071 and in Weinberg et al.. (2003), Applied Biochemistry and Biotechnology (accepted). In addition, some strains in our studies have shown bacteriocins like activity. These included Pediococcus pentosaceus, Enterococcus faecium and Lactobacillus plantarum Mill 1. These results will enable us to continue the research with the LAB strains that survived best in the rumen fluid and have the highest potential to affect the rumen environment.

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