Ahmad Tawab Abawi

Heat, Light, and Sound Research

12730 High Bluff Drive, Suite 130

San Diego, CA 92130

 (858) 336-6409, (858) 228-1734 (Fax)

abawi@HLSResearch.com


Research Interest

My areas of interest include mathematical modeling and computational physics, numerical solution of partial differential equations and boundary value problems, scattering theory, acoustic and electromagnetic propagation modeling.   I am also interested in array signal processing, matched field processing and data analysis.

 

Education

1993

Ph.D., Physics, University of California, San Diego

 

1988

MS, Physics, University of California, San Diego

 

1984

BS, Physics, University of California, Irvine

 

1983

BS, Electrical Engineering, University of California, Irvine

 


Dissertation

The WKB solution of the wave equation for a plane angular sector

Work Experience

Dec 2004-Present

Chief Scientist Heat, Light, and Sound Research Inc.   

Modeling of sound scattering from targets in a waveguide, Algorithm development, Propagation modeling, Signal processing. 

Oct 2003-Dec 2004

Senior Scientist Center for Ocean Research, Science Applications International Corporation.  

Algorithm development, Signal processing, Data analysis, Matched field processing.

March 1995 - May 1997

Staff scientist AETC Inc, San Diego

Signal processing, data analysis, modeling of scattering from submerged objects.

December 1993-June 1995

Post-graduate researcher   Marine Physical Laboratory, Scripps Institute of Oceanography, University of California, San Diego

Propagation modeling, coupled mode theory, signal processing.

1991-1992

Member of technical staff   Hughes Technology Center, Carlsbad, CA 

Monte Carlo methods in modeling of electron transport in semiconductors.

1990-1991

Member of technical staff   Hughes Research Labs, Malibu, CA

Computation of radar cross-section of finite objects and mechanical modeling using variational techniques.

1983-1990

Member of technical staff   Hughes Technology Center, Carlsbad, CA 

Modeling and simulation of semiconductor and superconductor devices and computer code development. 

 

Publications

 


Ahmad T. Abawi, and Petr Krysl, “Coupled finite element/boundary element formulation of scattering from an elastic object  in a layered mediumJ. Acoust. Soc. Am. 142 (6), 3637 (2017).


Ahmad T. Abawi, “Kirchhoff scattering from non-penetrable targets as an assembly of triangular facets”,   J. Acoust. Soc. Am. 140(3), 1878 (2016).

Ahmad T. Abawi, “The use of the virtual source technique in computing scattering from periodic ocean surface”,  J. Acoust. Am. 130(2), 683 (2011).


Ahmad T. Abawi and Michael B. Porter, “Propagation in an elastic wedge using the virtual source technique”,  J. Acoust. Am. 121, 1374 (2007).

 

Ahmad T. Abawi, "An energy-conserving one-way coupled mode propagation model",  J. Acoust. Soc. Am. 111(1), Pt. 1, Jan. 2002.

 

 

N. O. Booth, P. W. Schey, A. T. Abawi and W. S. Hodgkiss , "Detection of low-level broadband signals using adaptive matched-field processing with vertical aperture arrays",  IEEE J. Oceanic Engineering, 25(3) July 1998

 

 

Ahmad T. Abawi and Roger F. Dashen, "The WKB solution of the wave equation for a plane angular sector",  Physical Review E, 58(1):1051-1063, July 1998

 

 

 Ahmad T. Abawi and Roger F. Dashen, "The scattering amplitude for a plane angular sector",  Physical Review E, 56(2):2172-2180, August 1997.

 

 

Ahmad T. Abawi, W. A. Kuperman and Michael D. Collins, "Coupled mode parabolic equation",  J. Acoust. Soc. Am., 102(1), 233-238, July 1997.

 

 

Ahmad T. Abawi,  Roger F. Dashen and Herbert Levine,  "The eigenvalues of the Laplacian on sphere with boundary conditions specified on a segment of a great circle"Journal of Mathematical Physics , 38(3):1623-1649, March 1997.

 

 

Ahmad T. Abawi, Roger Dashen and Steve Wandzura,  "Line integral formula for scattering of waves from a thin plate",  Physical Review E, 52-1:1235-1237, 1995. 

 

 

Ahmad T. Abawi,  "The use of a new formula in calculation of scattering from sinusoidal surfaces",  presented at the Shallow Water Acoustic Conference (SWAC-97) in Beijing, China, April 1997.

 

 

G. Liao, A.F. Lawrence and Ahmad Abawi,  "Noise and nonlinearities in (1+1)-dimensional systems",  Communications in Theoretical Physics, Vol. 16 No. 2, 195-200, 1991.

 

 

Ahmad T. Abawi,  "The bending of bonded layers due to thermal stress",  Hughes Research Labs. Internal Memorandum (Feb. 1991)

 

 

Ahmad T. Abawi,  "The use of variational principle in determining the equilibrium shape of solder joints",  Hughes Research Labs. Internal Memorandum (Dec. 1990)

 

 

Ahmad T. Abawi,  "Determination of the resonant frequencies of a cone-sphere by the method of moments",  Hughes Research Labs. Internal Memorandum (Sep. 1990)

 

 

Conference Presentations

 

 

Ahmad T. Abawi, Ivars P. Kirsteins, Phillip L. Marston and Timothy D. Daniel, “Measuring the modal shape of elastic targets using modulated radiation pressure J. Acoust. Soc. Am. 146, 3019 (2019).

 

Ahmad T. Abawi, Ivars P. Kirsteins, Phillip L. Marston and Timothy D. Daniel, “Scattering from multiple elastic targets using the coupled finite element/boundary element methodJ. Acoust. Soc. Am. 144, 1810 (2018).


Ahmad T. Abawi, and Petr Krysl, “Coupled finite element/boundary element formulation of scattering from an elastic object  in a layered mediumJ. Acoust. 

Soc. Am. 142 (6), 3637 (2017).


Ahmad T. Abawi, Ivars P. Kirsteins, Phillip L. Marston and Timothy D. Daniel, “On target excitation by modulated radiation pressureJ. Acoust. Soc. Am. 142, 2498 (2017).


Ahmad T. Abawi, “Finite Element and Boundary Methods in Structural Acoustics and VibrationJ. Acoust. Soc. Am. 141, 4300 (2017).


Ahmad T. Abawi, Petr Krysl, Aubrey España, Steve Kargl and Kevin Williams, “Modeling the acoustic response of elastic targets in a layered medium using the coupled finite element/boundary element methodJ. Acoust. Soc. Am. 140, 2968 (2016).


Ahmad T. Abawi, “Numerically exact three-dimensional propagationJ. Acoust. Soc. Am. 137, 2419 (2015).


 Ahmad T. Abawi and Petr Krysl, “The fluid–structure interaction technique specialized to axially symmetric targetsJ. Acoust. Soc. Am. 136, 2086 (2014).


 Ahmad T. Abawi and Ivars Kirsteins, “Acoustic radiation force. Part I: Finite element modeling for elastic objectsJ. Acoust. Soc. Am. 134, 4109 (2013).


 Ahmad T. Abawi and Ivars Kirsteins, “Acoustic radiation force. Part II:  Eigenmode excitation of a scaled targetJ. Acoust. Soc. Am. 134, 4110 (2013).


 Ahmad T. Abawi and Paul Hursky, “The use of graphical processing unit in rough surface scatteringJ. Acoust. Soc. Am. 133, 3615 (2013).


 Ahmad T. Abawi, Ivars Kirsteins and Daniel Plotnick, “An experimental study of drive-by single channel time reversal using scaled targets and clutterJ. Acoust. Soc. Am. 132, 2082 (2012).


Ahmad T. Abawi, “Low frequency scattering from elastic objects embedded in a waveguide by the finite element techniqueJ. Acoust. Soc. Am. 129, 2486 (2011).


 Ahmad T. Abawi, “Scattering from elastic objects in a waveguide using the finite element techniqueJ. Acoust. Soc. Am. 128, 2292 (2010).


Ahmad T. Abawi and Michael B. Porter, “Scattering from rotationally‐symmetric objects using only free space Green's functionsJ. Acoust. Soc. Am. 123, 3466 (2008).


Ahmad T. Abawi, Michael B. Porter and Martin Siderius, “Modeling of glints due to surface curvature using the virtual source techniqueJ. Acoust. Soc. Am. 119, 3310 (2006).



 

 

  

 

 

 

 

 




 

FURTHER DETAILS AND REFERENCES AVAILABLE UPON REQUEST