BEGIN:VCALENDAR VERSION:2.0 PRODID:IEEE vTools.Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:America/New_York BEGIN:DAYLIGHT DTSTART:20240310T030000 TZOFFSETFROM:-0500 TZOFFSETTO:-0400 RRULE:FREQ=YEARLY;BYDAY=2SU;BYMONTH=3 TZNAME:EDT END:DAYLIGHT BEGIN:STANDARD DTSTART:20241103T010000 TZOFFSETFROM:-0400 TZOFFSETTO:-0500 RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=11 TZNAME:EST END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20241109T005602Z UID:E9D9955E-F20C-4ACA-8130-9D51697B561C DTSTART;TZID=America/New_York:20241009T133000 DTEND;TZID=America/New_York:20241009T150000 DESCRIPTION:The analysis of electromagnetic problems with moving objects ha s many applications: RF Doppler radars\, astrophysics\, GPS\, electromagne tic 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 im plemented by changing positions of the objects at each time step\, through the classical FDTD time loop. With this direct approach\, time is implici tly absolute and Voigt-Lorentz transformations are not implemented. This t echnique is suitable for non-relativistic speeds and\, thus for most encou ntered electromagnetic problems\, especially in antennas and propagation d omain. The numerical aspects that need to be considered are studied. Then\ , different problems are investigated: moving plane wave source with resis tors\, moving observation point\, moving inclined Partially Reflecting Sur face (PRS)\, moving line source\, and moving metallic cylinder illuminated by a plane wave. The results\, in terms of Doppler frequency shift and ch anges in amplitude of the electric field\, are compared with those of spec ial relativity which are considered as the references. Some aspects of spe cial relativity are present in the direct FDTD approach\, such as the inde pendence of the velocity of electromagnetic wave propagation with the spee d of the source and Lorentz local time (with a different physical interpre tation). Some of the obtained results agree with special relativity. Other ones are different\, but the differences are negligible for non-relativis tic speeds. Techniques are proposed for the implementation of relativistic effects. The results obtained with our analysis bring new physical insigh ts 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 so urce does not increase with the speed of motion. Moreover\, for a moving s cattering metallic wire\, one can observe a phenomenon similar to shock wa ves. Other analyzed problems include complex motions (multiple speeds\, ac celeration\, rotation\, oscillation)\, moving airplanes\, Michelson-Morley interferometer\, Sagnac effect\, and Heaviside faster-than-light analysis . Some quantum phenomena (Compton experiment\, blackbody radiation) are al so studied…\n\nCo-sponsored by: INRS\, Staracom\n\nRoom: 6900\, Bldg: 80 0\, De La Gauchetière Ouest Bureau\, INRS\, 6th floor\, MONTREAL\, Quebec \, Canada\, H5A 1K6 LOCATION:Room: 6900\, Bldg: 800\, De La Gauchetière Ouest Bureau\, INRS\, 6th floor\, MONTREAL\, Quebec\, Canada\, H5A 1K6 ORGANIZER:djerafi@emt.inrs.ca SEQUENCE:4 SUMMARY:Computational electromagnetism with moving matter and some quantum phenomena URL;VALUE=URI:https://events.vtools.ieee.org/m/437515 X-ALT-DESC:Description: <br /><p class="x_MsoNormal"><span lang="EN-CA">The analysis of electromagnetic problems with moving objects has many applica tions: RF Doppler radars\, astrophysics\, GPS\, electromagnetic gyroscopes &hellip\; This seminar proposes an original and thorough analysis of the b ehavior of electromagnetic waves in the presence of moving bodies by using the Finite Difference Time Domain (FDTD) method. Movements are implemente d by changing positions of the objects at each time step\, through the cla ssical FDTD time loop. With this direct approach\, time is implicitly abso lute and Voigt-Lorentz transformations are not implemented. This technique is suitable for non-relativistic speeds and\, thus for most encountered e lectromagnetic problems\, especially in antennas and propagation domain. T he numerical aspects that need to be considered are studied. Then\, differ ent problems are investigated: moving plane wave source with resistors\, m oving observation point\, moving inclined Partially Reflecting Surface (PR S)\, moving line source\, and moving metallic cylinder illuminated by a pl ane wave. The results\, in terms of Doppler frequency shift and changes in amplitude of the electric field\, are compared with those of special rela tivity which are considered as the references. Some aspects of special rel ativity 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 ar e different\, but the differences are negligible for non-relativistic spee ds. 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 t hat the amplitude of the electric field for an ideal plane wave source doe s not increase with the speed of motion. </span><span lang="EN-CA">Moreove r\, for a moving scattering metallic wire\, one can observe a phenomenon s imilar to shock waves. Other analyzed problems include complex motions (mu ltiple speeds\, acceleration\, rotation\, oscillation)\, moving airplanes\ , Michelson-Morley interferometer\, Sagnac effect\, and Heaviside faster-t han-light analysis. Some quantum phenomena (Compton experiment\, blackbody radiation) are also studied&hellip\;</span></p>\n<p class="x_MsoNormal">< span lang="EN-CA">&nbsp\;</span></p>\n<p class="x_MsoNormal"><span lang="E N-CA">&nbsp\;</span></p>\n<p class="x_MsoNormal" aria-hidden="true">&nbsp\ ;</p> END:VEVENT END:VCALENDAR