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Статті в журналах з теми "Injection de séquence nulle"
Kremer, S., Abu Eid, A. Bogorin, M. Koob, G. Bierry, G. Zollner, and J. L. Dietemann. "CO-14 - Apports de la séquence flair retardée après injection pour le diagnostic des lésions lepto-meningées." Journal of Neuroradiology 33, no. 1 (February 2006): 8. http://dx.doi.org/10.1016/s0150-9861(06)77134-6.
Повний текст джерелаLarbouret, Christel, Marie-Alix Poul, and Thierry Chardès. "Imiter la réponse immunitaire humorale polyclonale." médecine/sciences 35, no. 12 (December 2019): 1083–91. http://dx.doi.org/10.1051/medsci/2019216.
Повний текст джерелаLe Bras, Anthony, Valentine Crépin, François Eugène, Hélène Raoult, Jean-Yves Gauvrit, and Jean-Christophe Ferré. "Protocole IRM à la phase aiguë de l’accident vasculaire cérébral : l’ARM des troncs supra-aortiques après injection doit-elle remplacer la séquence 3D TOF ?" Journal of Neuroradiology 45, no. 2 (March 2018): 72–73. http://dx.doi.org/10.1016/j.neurad.2017.12.008.
Повний текст джерелаAuger, F., S. Willoteaux, C. Lions, Z. Negaiwi, L. Gengler, M. Midulla, K. Akkari, and J. P. Beregi. "Imagerie par résonance magnétique des artères coronaires : acquisition « cœur entier », en respiration libre, sans injection d’agent de contraste et utilisant la séquence 3D en écho de gradient balancé ultrarapide." Journal de Radiologie 91, no. 1 (January 2010): 78–81. http://dx.doi.org/10.1016/s0221-0363(10)70012-3.
Повний текст джерелаДисертації з теми "Injection de séquence nulle"
Bourgeade, Adrien. "PWM control optimization of a two-level inverter : Application to electric and hybrid vehicles." Electronic Thesis or Diss., Ecole centrale de Nantes, 2022. http://www.theses.fr/2022ECDN0045.
Повний текст джерелаDespite improvements in DC/AC converter topologies, the two-level inverter remains the "gold standard" in the industry for many reasons: simplicity, reliability, etc. In this thesis between Ecole Centrale and Renault, new inverter controls have been developed to improve the performance without modifying the converter topology. For this purpose, two approaches based on synchronous off-line controls have been proposed. Firstly, an angular symmetry relaxation between phases usually imposed on the converter. Secondly triangular carrier based strategies, meaning injecting a triple frequency homopolar sequence into the modulating signal. The consequence of this approach has given rise to a generalization of the classical third harmonic injection. A calculation extension has shown the existence of an easily implementable methodology, which takes the form of a sawtooth injection. Both approaches revisit the pulse width modulation (PWM) control strategies of the literature with simple considerations based on relaxation and extension of existing properties. The advantage of all these strategies is that they improve significantly the harmonic distortion rate of the voltages or currents supplied by the inverter for low synchronous switching frequencies. These observations have been done in simulation and validated on a low power experimental bench
Zaim, Sami. "Contribution à la commande sans capteur mécanique d' actionneurs électriques motorisés par des machines synchrones à aimants permanents." Thesis, Université de Lorraine, 2013. http://www.theses.fr/2013LORR0134/document.
Повний текст джерелаFor their high power density and ease of control, permanent magnet synchronous motors (PMSM) are widely used in more electric aircraft. In order to control PMSMs, precise information on the rotor position is required. This information is provided by position sensors which have inherent drawbacks despite their good precision: these sensors decrease reliability and increase weight, volume, and cost of the whole system. In this thesis, we present a mechanical sensorless control method by estimating the rotor speed and position only from the phase currents measurements. Sensorless control methods suitable for high speeds and based on back-EMF estimation are first discussed. Then, a state of the art in sensorless methods for low speeds operations is presented. A new sensorless control, independent from the motor parameters, is presented for operating at low speeds and standstill. Both simulations (on a PMSM model taking into account the saturation phenomenon) and experimental results show the effectiveness of this model-independent method. A convergence analysis and a robustness study of the proposed algorithm are also made. Finally, an initialization process and a method for smooth transition between low and high speeds methods are proposed and validated on an experimental test-bench
Dehghanikiadehi, Abbas. "Commande vectorielle innovante pour véhicules électriques ou hybrides." Thesis, Université Clermont Auvergne (2017-2020), 2017. http://www.theses.fr/2017CLFAC012/document.
Повний текст джерелаOver the last decade, the interest for low-carbon vehicle technologies has surged among both governments and automotive manufacturers across and beyond the European Union (EU). Great hopes have been put, first, on biofuel vehicles and more recently on electric vehicles (EVs) and hybrid electric vehicles (HEVs) as key technologies to mitigate climate change, enhance energy security and nurture new industry branches within the automotive sector. So electrification of vehicles has been seen as a key strategy to reduce CO2 emissions from the transport sector. The main challenge toward EVs and HEVs is to keep driving for longer distance (which has been always fields for competition among traction industries) as well as lifetime battery cells as storage system. As a result, these indicate importance of power converter efficiency as a key gate for next generations of these up-coming vehicles. The next parameter is the quality of output voltage/current (especially by suppressing low-order harmonics) to reduce the size of filtering. The aim of this thesis is to achieve better efficiency and output voltage/current Total Harmonic Distortion (THD) by proposing novel power converter and associated Pulse Width Modulation (PWM) methods while imposing modification on power converter topology. As a result, dual-inverter is proposed to supply open-end motor from both sides. To this aim, three PWM methods are suggested as: The first one, Modified Space Vector Modulation (MSVM) for dual-inverter supplied by single dc source, improves efficiency by 4-5% (while having lower switching losses), and reduces Common Mode Voltage (CMV) levels by 66%, as well. The voltage/current harmonics are analytically analyzed which shows mainly better performance. Effective switching frequency is also reduced by 66% due to the reduction of number of commutations. In the second one, Near State PWM (NSPWM) is adapted for dual-inverter supplied by single dc source in order to eliminate triplen harmonics (therefore Zero Sequence Voltage, ZSV) and improve efficiency (by 3-4%) compared to Space Vector Modulation (SVM). Additionally due to avoiding use of zero vectors, CMV is improved by 66%. While having 8 commutations instead of 12 in SVM, effective switching frequency is improved by 33%. And finally, the third proposed method deals with NSPWM for dual-inverter supplied by two isolated dc sources wherein efficiency and CMV levels show the same performance as previous one. However, in this method, voltage THD is highly reduced compared to SVM. Triplen harmonics of the output voltage are inherently suppressed by the structure. These 3 proposed methods are analytically studied and their performances are step by step simulated in Matlab/Simulink environment. Then the methods are implemented in dualinverter fed open-end motor in laboratory setup; and the results are compared with these of SVM. Finally, it is found that novel proposed methods are so competitive solutions to be applied in HEVs and EVs and bring superior efficiency and voltage/current harmonic features