BEGIN:VCALENDAR VERSION:2.0 X-WR-CALNAME:EventsCalendar PRODID:-//hacksw/handcal//NONSGML v1.0//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:America/New_York LAST-MODIFIED:20240422T053451Z TZURL:https://www.tzurl.org/zoneinfo-outlook/America/New_York X-LIC-LOCATION:America/New_York BEGIN:DAYLIGHT TZNAME:EDT TZOFFSETFROM:-0500 TZOFFSETTO:-0400 DTSTART:19700308T020000 RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU END:DAYLIGHT BEGIN:STANDARD TZNAME:EST TZOFFSETFROM:-0400 TZOFFSETTO:-0500 DTSTART:19701101T020000 RRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU END:STANDARD END:VTIMEZONE BEGIN:VEVENT CATEGORIES:College of Engineering,Thesis/Dissertations DESCRIPTION:Topic: The Spectral Projection Model for Scattering of Electrom agnetic Waves from Cylindrical and Spherical Surfaces Abstract: In the f ields of radar, remote sensing and wireless communications, estimating the scattered electromagnetic field is one of the most significant objectives pursued. The scattered electromagnetic field can be estimated by calculat ing the induced currents on the surface of the object under consideration. The most widely used computational technique for calculating the current induced on a regular or irregular geometrical surface is the Method of Mom ents (MoM). The computational complexity of MoM depends heavily on the geo metry of the surface, and the number of data points needed for accurate es timates of the currents make the computational load overwhelming. The Spec tral Projection Model is a novel approach which was developed to preserve the physical clarity of the scattering process, while minimizing the compu tational complexity. SPM utilizes the addition theorem for Hankel and Bess el functions to formulate the scattering process as a projection of vector s known as spectral signatures. This approach does not estimate the induce d current on the surface, instead it solves for the spectral signature of the induced current, which is used to estimate the scattered fields. This effectively reduces the computational load of the numerical calculations. A novel vector sum technique is utilized to translate the origin and circu mvent constraints of the addition theorem. Electromagnetic scattering is a nalyzed in elementary curvilinear wave functions such cylindrical and sphe rical surfaces. SPM is verified and validated by applying it to the scatte ring from complex structures such as multi-layered cylinders and spheres. Simulation results from SPM are compared with those from MoM and modal ana lysis. The comparisons indicate that SPM generates results which are accur ate at a significantly lower computational cost. Advisor: Dr. Dayalan P. Kasilingam, Professor, Department of Electrical & Computer Engineering, U MASS Dartmouth Committee Members: Dr. Paul J. Gendron, Professor, Depart ment of Electrical & Computer Engineering, UMASS Dartmouth; Dr. Antonio H. Costa, Professor Emeritus, Department of Electrical & Computer Engineerin g, UMASS Dartmouth; Dr. Alfa Heryudono, Professor, Mathematics Department, UMASS Dartmouth; Dr. Sembiam R. Rengarajan, Professor, Department of Elec trical & Computer Engineering, California State University NOTE: All ECE G raduate Students are ENCOURAGED to attend. All interested parties are invi ted to attend. Open to the public. *For further information, please contac t Dr. Dayalan Kasilingam via email at dkasilingam@umassd.edu.\nEvent page: https://www.umassd.edu/events/cms/9-18-26-doctor-of-philosophy-dissertati on-defense--by-vidyasagar-sivalingam.php\nEvent link: https://umassd.zoom. us/j/94368881668 X-ALT-DESC;FMTTYPE=text/html:

Topic: The Spectral Projection Model for Scattering of Electromagnetic Waves from Cylindrical and Spheric al Surfaces

Abstract: In the fields of radar\, remote sensing an d wireless communications\, estimating the scattered electromagnetic field is one of the most significant objectives pursued. The scattered electrom agnetic field can be estimated by calculating the induced currents on the surface of the object under consideration. The most widely used computatio nal technique for calculating the current induced on a regular or irregula r geometrical surface is the Method of Moments (MoM). The computational co mplexity of MoM depends heavily on the geometry of the surface\, and the n umber of data points needed for accurate estimates of the currents make th e computational load overwhelming. The Spectral Projection Model is a nove l approach which was developed to preserve the physical clarity of the sca ttering process\, while minimizing the computational complexity. SPM utili zes the addition theorem for Hankel and Bessel functions to formulate the scattering process as a projection of vectors known as spectral signatures . This approach does not estimate the induced current on the surface\, ins tead it solves for the spectral signature of the induced current\, which i s used to estimate the scattered fields. This effectively reduces the comp utational load of the numerical calculations. A novel vector sum technique is utilized to translate the origin and circumvent constraints of the add ition theorem. Electromagnetic scattering is analyzed in elementary curvil inear wave functions such cylindrical and spherical surfaces. SPM is verif ied and validated by applying it to the scattering from complex structures such as multi-layered cylinders and spheres. Simulation results from SPM are compared with those from MoM and modal analysis. The comparisons indic ate that SPM generates results which are accurate at a significantly lower computational cost.

Advisor: Dr. Dayalan P. Kasilingam\, Profes sor\, Department of Electrical & Computer Engineering\, UMASS Dartmouth < /p>\n

Committee Members: Dr. Paul J. Gendron\, Professor\, Department of Electrical & Computer Engineering\, UMASS Dartmouth\; Dr. Antonio H. Cost a\, Professor Emeritus\, Department of Electrical & Computer Engineering\, UMASS Dartmouth\; Dr. Alfa Heryudono\, Professor\, Mathematics Department \, UMASS Dartmouth\; Dr. Sembiam R. Rengarajan\, Professor\, Department of Electrical & Computer Engineering\, California State University

N OTE: All ECE Graduate Students are ENCOURAGED to attend. All interested pa rties are invited to attend. Open to the public.

*For further info rmation\, please contact Dr. Dayalan Kasilingam via email at dkasilingam@u massd.edu.

Event page: https://www.umassd.edu/events/cms/9-18-26-doctor-of-philosophy-disser tation-defense--by-vidyasagar-sivalingam.php
Event link: https://umassd.zoom.us/j/94368881668< /a>

DTSTAMP:20260902T221611 DTSTART;TZID=America/New_York:20260918T100000 DTEND;TZID=America/New_York:20260918T120000 LOCATION:Lester W. Cory Conference Room, Science & Engineering Building (SENG), Room 213A SUMMARY;LANGUAGE=en-us:ELEE Doctor of Philosophy Dissertation Defense by V idyasagar Sivalingam UID:cdc1e0adca41ef7d6894518364b7e4f8@www.umassd.edu END:VEVENT END:VCALENDAR