The Experts below are selected from a list of 233751 Experts worldwide ranked by ideXlab platform
James Stuber - One of the best experts on this subject based on the ideXlab platform.
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influence of stray light on visible spectroscopy for the scrape off layer in iter
Plasma Physics and Controlled Fusion, 2013Co-Authors: Shin Kajita, E Veshchev, Steve Lisgo, Robin Barnsley, M Walsh, R Reichle, A G Alekseev, A V Gorshkov, Dmitry Vukolov, James StuberAbstract:Since ITER will be a full metallic wall machine, scattered photons from the strong emission in the divertor may distort the emission from the scrape-off layer (SOL). The influence of stray light for visible spectroscopy of H? and Be?I emissions in ITER was investigated with a ray-tracing simulation. It was found that the stray light would be always more than one order of magnitude greater than the Real Signal intensity for H? emission from the SOL. For Be?I emission, although the situation was better than the cases of H? measurement, the stray light could be much larger than the Real Signal from the SOL. In ITER, it will inevitably reduce the stray light somehow for visible spectroscopy. The effect of optical dumps embedded on first walls was investigated with the ray-tracing analysis.
Amir Shahdadi - One of the best experts on this subject based on the ideXlab platform.
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MTPA Tracking Algorithms for IPMSMs and SynRMs: Accurate Evaluation and Adaptive Tuning of Real Signal Injection and Virtual Signal Injection
2020 IEEE Energy Conversion Congress and Exposition (ECCE), 2020Co-Authors: Sandro Calligaro, Davide Marzona, Roberto Petrella, Amir ShahdadiAbstract:Two main classes for Maximum-Torque-Per-Ampere (MTPA) tracking in Interior Permanent Magnet (IPM) and Synchronous Reluctance (SynR) machines have been proposed in literature, namely Real Signal Injection (RSI) and Virtual Signal Injection (VSI). Unfortunately, a fair evaluation of the accuracy and performance of each class and a direct comparison between them is still missing, and is the first contribution of this paper. Validation and evaluation of the accuracy and performance is considered, by taking into account a non-linear model of a SynRM, based on an analytical representation of flux-linkage, in order to reduce the errors due to approximations, allowing therefore a quantitative comparison. A new technique is proposed, allowing both tuning and adaptation of the VSI tracking loop gains, therefore assuring both stability and the same dynamical performance in the whole machine torque/speed range. Finally, an original strategy to compensate for steady-state MTPA tracking errors due to non-linear flux maps is proposed, thus increasing the accuracy of VSI even in the case the machine flux maps are known with relatively low quantization. An IPM motor drive is considered to validate the proposed contributions.
Shin Kajita - One of the best experts on this subject based on the ideXlab platform.
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influence of stray light for divertor spectroscopy in iter
Journal of Nuclear Materials, 2015Co-Authors: Shin Kajita, E Veshchev, Steve Lisgo, Robin Barnsley, Philip J Morgan, M Walsh, Toshinori Sugie, H. Ogawa, Keisuke ItamiAbstract:Abstract The influence of stray light in the divertor spectroscopy system in ITER is quantitatively investigated using a ray tracing simulation. Simulation results show that the stray light is negligible at positions in the divertor where the plasma emission is strong. However, it is also shown that the stray light can be significantly greater than the Real Signal if the plasma intensity is low. Deuterium and beryllium emissions are used for the assessment; for beryllium cases in particular, since the emission profile may be non-uniform in the divertor region, the influence of stray light can be non-negligible at some positions, e.g., above the divertor dome.
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influence of stray light on visible spectroscopy for the scrape off layer in iter
Plasma Physics and Controlled Fusion, 2013Co-Authors: Shin Kajita, E Veshchev, Steve Lisgo, Robin Barnsley, M Walsh, R Reichle, A G Alekseev, A V Gorshkov, Dmitry Vukolov, James StuberAbstract:Since ITER will be a full metallic wall machine, scattered photons from the strong emission in the divertor may distort the emission from the scrape-off layer (SOL). The influence of stray light for visible spectroscopy of H? and Be?I emissions in ITER was investigated with a ray-tracing simulation. It was found that the stray light would be always more than one order of magnitude greater than the Real Signal intensity for H? emission from the SOL. For Be?I emission, although the situation was better than the cases of H? measurement, the stray light could be much larger than the Real Signal from the SOL. In ITER, it will inevitably reduce the stray light somehow for visible spectroscopy. The effect of optical dumps embedded on first walls was investigated with the ray-tracing analysis.
Alexander S Mikhailov - One of the best experts on this subject based on the ideXlab platform.
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design and statistical properties of robust functional networks a model study of biological Signal transduction
Physical Review E, 2007Co-Authors: Pablo Kaluza, Mads Ipsen, Martin Vingron, Alexander S MikhailovAbstract:A simple flow network model of biological Signal transduction is investigated. Networks with prescribed Signal processing functions, robust against random node or link removals, are designed through an evolutionary optimization process. Statistical properties of large ensembles of such networks, including their characteristic motif distributions, are determined. Our analysis suggests that robustness against link removals plays the principal role in the architecture of Real Signal transduction networks and developmental genetic transcription networks.
Boualem Boashash - One of the best experts on this subject based on the ideXlab platform.
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ICASSP (3) - Filtering Real Signals through frequency modulation and peak detection in the time-frequency plane
Proceedings of ICASSP '94. IEEE International Conference on Acoustics Speech and Signal Processing, 1Co-Authors: M. J. Arnold, M. Roessgen, Boualem BoashashAbstract:A novel technique for filtering a Real Signal is presented. The method is based upon encoding the Signal as an instantaneous frequency (IF) and using IF analysis techniques to recover a filtered version of it. A general iterative time-frequency peak filtering (TFPF) scheme based on this method is formulated. Simulations are given which show extremely clean recovery of Signals in noise levels down to -9 dB. Applications to estimating the polynomial phase coefficients of nonstationary Signals and differentiating noisy Signals are presented. >
