The analysis of electromagnetic problems with moving objects has many applications: RF Doppler radars, astrophysics, GPS, electromagnetic gyroscopes… This seminar proposes an original and thorough analysis of the behavior of electromagnetic waves in the presence of moving bodies by using the Finite Difference Time Domain (FDTD) method. Movements are implemented by changing positions of the objects at each time step, through the classical FDTD time loop. With this direct approach, time is implicitly absolute and Voigt-Lorentz transformations are not implemented. This technique is suitable for non-relativistic speeds and, thus for most encountered electromagnetic problems, especially in antennas and propagation domain. The numerical aspects that need to be considered are studied. Then, different problems are investigated: moving plane wave source with resistors, moving observation point, moving inclined Partially Reflecting Surface (PRS), moving line source, and moving metallic cylinder illuminated by a plane wave. The results, in terms of Doppler frequency shift and changes in amplitude of the electric field, are compared with those of special relativity which are considered as the references. Some aspects of special relativity are present in the direct FDTD approach, such as the independence of the velocity of electromagnetic wave propagation with the speed of the source and Lorentz local time (with a different physical interpretation). Some of the obtained results agree with special relativity. Other ones are different, but the differences are negligible for non-relativistic speeds. Techniques are proposed for the implementation of relativistic effects. The results obtained with our analysis bring new physical insights into the propagation of waves with moving bodies. In particular, it is shown that the amplitude of the electric field for an ideal plane wave source does not increase with the speed of motion. Moreover, for a moving scattering metallic wire, one can observe a phenomenon similar to shock waves. Other analyzed problems include complex motions (multiple speeds, acceleration, rotation, oscillation), moving airplanes, Michelson-Morley interferometer, Sagnac effect, and Heaviside faster-than-light analysis. Some quantum phenomena (Compton experiment, blackbody radiation) are also studied… Co-sponsored by: INRS, Staracom Room: 6900, Bldg: 800, De La Gauchetière Ouest Bureau, INRS, 6th floor, MONTREAL, Quebec, Canada, H5A 1K6

Abstract: The talk will review the work done by the group of kinetics of nanosecond discharges of Laboratory of Plasma Physics in the direction of studying of plasma parameters and optimizing plasma chemistry. Special attention will be payed to techniques related to optics, plasma action on cell morphology and measuring of ROS produced by plasma. The capabilities of the phase imaging technique, Quadriwave Lateral Shearing Interferometry (QLSI) as a diagnostic for the plasma action on living cells will be discussed. A novel approach to calibration of ratio of two-photon Xe/O cross-sections for two-photon absorption fluorescence (TALIF) of atomic oxygen will be presented. Bio: Svetlana Starikovskaia received the Ph.D. in Plasma Physics from Moscow Institute of Physics and Technology (MIPT) in 1993, Dr.Sc. degree from Joint Institute of High Temperatures Russian Academy of Sciences in Moscow State University in 2000 and degree of Professor from MIPT in 2006. She is currently a CNRS Leading Scientific Researcher in Laboratory of Plasma Physics (LPP) and Professor at Ecole Polytechnique, Palaiseau, France. Her scientific interest involves molecular energy transfer, non-equilibrium plasma, plasma-assisted combustion, shock waves and chemical kinetics, plasma conversion of CO2, plasma-living cells interaction. Local J-1035 Pavillon J. A. Bombardier, Polytechnique Montréal, Montréal, Quebec, Canada

[] Despite major breakthroughs in chatbot and virtual assistant technology, the use of chatbots in education is still insubstantial. In my talk, based on my thesis, I will delve into chatbot technology’s under-explored potential in education: What are educational chatbots’ advantages and limitations? What pedagogical approaches emphasize their capabilities and help overcome their shortcomings? What are the best scenarios for their integration into a digital educational platform? To explore answers to these questions, I will present a prototype of a crowd-learning platform with integrated peer-chatbots that has a potential to contribute to a more successful educational process. Speaker(s): Dr. Shaydullina Virtual: https://events.vtools.ieee.org/m/438523

Cyber Security is an Application of Decision Sciences or Why Every Cyber Security Dept Needs a Decision Scientist Cyber has become a big topic. Cyber security may be the new battlefront. The news is covered with stories of this or that company or agency being hacked and the information being for sale on the dark web. It affects business, military, medical, and many forms of life. This presentation gives an overview of what is cyber security and how it is managed. The theory behind the programming is explained covering the concepts of why and how. This is done from the perspective of a decision scientist and programming is not discussed. Many examples are given to demonstrate the concepts. Speaker(s): Dr Brad Morantz, Virtual: https://events.vtools.ieee.org/m/438059

L'optique spatiale au service de la Terre - maintenir l'humanité dans les limites planétaires Abstract: Satellite technologies play an essential role in the fight against climate change. The data needed for prediction, mitigation and adaptation are often obtained using optical instruments. In this presentation, Geneviève will share some examples of projects led by the Canadian Space Agency in this direction, and provide an overview of existing programs to participate in space developments that may be of interest to research groups and the student community. She will also discuss diverse efforts to increase equity, diversity and inclusion in the space sector and STEM in general, hopefully inspiring the audience to bring their own contributions toward a more diverse and inclusive field. ------------------------------------------------------------------------ L’optique spatiale au service de la Terre – maintenir l’humanité dans les limites planétaires Résumé : Les technologies satellitaires jouent un rôle essentiel dans la lutte contre le changement climatique. Les données nécessaires pour la prédiction, l'atténuation et l'adaptation sont souvent obtenues à l'aide d'instruments optiques. Dans cette présentation, Geneviève partagera quelques exemples de projets menés par l'Agence spatiale canadienne dans ce domaine et fournira un aperçu des programmes existants permettant de participer aux développements spatiaux qui pourraient intéresser les groupes de recherche et la communauté étudiante. Elle discutera également des divers efforts visant à accroître l'équité, la diversité et l'inclusion dans le secteur spatial et dans les STIM en général, dans l'espoir d'inspirer l'auditoire à apporter leurs propres contributions vers un domaine plus diversifié et inclusif. Co-sponsored by: Astrolith. Speaker(s): Geneviève Gariépy Agenda: - 14:30-15:30: séminaire (hybride) / seminar (hybrid) - 15:30-16:00: réseautage (sur place) / networking (on-site only) Room: A-416 , Bldg: PAVILLON PRINCIPAL, Polytechnique Montréal, Montréal, Quebec, Canada, Virtual: https://events.vtools.ieee.org/m/439332