Friday, November 21, 2003 4:00 p.m. Dr. Jean-Claude Risset Composer and Director of Research at CNRS Laboratoire de Mcanique et d’Acoustique Marseille, France http://omicron.cnrs-mrs.fr Dr. Risset will give a talk on the perception of musical sound, with a number of sound examples on CD. He will elaborate on the progress in perception of musical sound…
Friday, October 31, 2003 4:00 p.m. Shihong Chi Department of Petroleum and Geosystems Engineering The University of Texas at Austin http://www.pge.utexas.edu Modern acoustic logging provides accurate descriptions of in-situ velocities of elastic waves propagating in rock formations. These velocities are used to calibrate surface seismic data and to estimate the strength of rock formations for…
Friday, October 24, 2003 4:00 p.m. Dr. Brian R. La Cour and Mr. Michael Linford Applied Research Laboratories The University of Texas at Austin http://www.arlut.utexas.edu A novel method of detection and classification for marine mammals is presented which uses techniques from independent component analysis to solve the blind source separation problem for right whales in…
Friday, October 10, 2003 4:00 p.m. Dr. Frank Boyle Applied Research Laboratories The University of Texas at Austin http://www.arlut.utexas.edu An acoustic line array’s finite aperture can be used to localize sources of detected acoustic signals in range as well as azimuth. Two passive localization methods have been explored, including (1) a range focusing method wherein…
Friday, October 3, 2003 4:00 p.m. Xiang Yan Department of Mechanical Engineering The University of Texas at Austin http://www.me.utexas.edu Tissue harmonic imaging (THI) is a new imaging technique in medical ultrasound. The images are created from the nonlinearly generated second harmonics produced when ultrasound propagates inside the body. For many patients, THI improves image resolution…
Friday, September 19, 2003 4:00 p.m. Professor Robert H. Flake Department of Electrical and Computer Engineering The University of Texas at Austin http://www.ece.utexas.edu A nondispersive propagating waveform has recently been discovered. This special signal, called Speedy Delivery (SD), can theoretically be transmitted in many different categories of lossy, dispersive media without change in shape or…
Friday, September 12, 2003 4:00 p.m. Professor Preston Wilson Department of Mechanical Engineering The University of Texas at Austin http://www.me.utexas.edu Sonar operation in shallow water is complicated by interaction with the sea surface. One difficulty is accounting for scattering from near-surface bubble clouds, which are generated by breaking waves. This problem has been addressed in…
Friday, August 29, 2003 4:00 p.m. Professor Tom Muir Jamie Whitten National Center for Physical Acoustics University of Mississippi and the U.S. Naval Postgraduate School, Monterrey, California http://www.olemiss.edu/depts/ncpa http://www.olemiss.edu http://www.nps.navy.mil Over 100 million landmines are buried in over 60 countries, worldwide, killing or maiming over 25,000 innocent humans each year, mostly women and children. Present…
Thursday, April 17, 2003 4:00 p.m. Adam Dudley Technical Coordinator/Audio Supervisor Bass Concert Hall The University of Texas at Austin http://www.utpac.org A technical tour of Bass Concert Hall will commence at the loading dock entrance on the back (west) side of the building. The tour will describe how the technical team configures the auditorium and…
Friday, April 11, 2003 4:00 p.m. Professor David Peterson Department of Mathematics University of Central Arkansas, Conway, Arkansas http://www.uca.edu/divisions/academic/math http://www.uca.edu Vibrating bars have been extensively studied and the theory is well understood. But unlike a vibrating string, mode frequencies are not integer multiples of the fundamental. By carving a bar in various ways it is…
Friday, April 4, 2003 4:00 p.m. Dr. Diane Dalecki Department of Biomedical Engineering University of Rochester, Rochester, New York http://www.bme.rochester.edu http://www.rochester.edu Tissues known to contain gas bodies are particularly susceptible to damage from exposure to acoustic fields. Lung and intestine contain gas bodies naturally and studies have demonstrated that ultrasound can produce damage to these…
Monday, March 31, 2003 4:00 p.m. Professor Preston Wilson Department of Mechanical Engineering The University of Texas at Austin http://www.me.utexas.edu For sonar-based naval operations to be successful in shallow water, significant knowledge of the acoustic behavior of the ocean surface, the water column, and the ocean bottom is required. Natural and artificial processes produce bubbles…
Friday, March 21, 2003 4:00 p.m. Jack Evans, P.E. JEAcoustics http://www.jeacoustics.com Two case studies will be presented involving architectural acoustics and noise control issues at the Denton A. Cooley Texas Heart Institute Building in Houston . Very late in the construction phase the hospital management decided to convert an unused atrium, designed originally as a…
Friday, March 7, 2003 4:00 p.m. Jeff G. Schmitt, P.E. VIAcoustics http://www.viacoustics.com Jeff G. Schmitt is a 1983 UT graduate in acoustics and, until 1995, he served as President of Acoustic Systems, an Austin based manufacturer of acoustical enclosures. Since starting his own independent consulting firm he has worked with a variety of large and…
Monday, March 3, 2003 4:00 p.m. Dr. Ron E. Kumon Department of Physics University of Windsor, Windsor, Ontario, Canada http://cronus.uwindsor.ca/units/physics/home.nsf/welcome?OpenForm http://cronus.uwindsor.ca/ The linear and nonlinear properties of surface acoustic waves (SAWs) in crystalline and laminated media are significantly different from those of SAWs in an isotropic half-space. Selected numerical results are presented for the propagation…
Friday, February 21, 2003 4:00 p.m. Professor Mark Hamilton Department of Mechanical Engineering The University of Texas at Austin http://www.me.utexas.edu Acoustic streaming is the steady flow that is generated by momentum transfer associated with the attenuation of sound. In a standing wave, shear stresses in the viscous boundary layer along the side walls of an…
Friday, February 14, 2003 4:00 p.m. Jeff G. Schmitt, P.E. VIAcoustics http://www.viacoustics.com Jeff G. Schmitt is the principal consultant of JGS Consulting, he is a 1983 UT graduate in acoustics and, until 1995, he served as the President of Acoustic Systems, an Austin based manufacturer of acoustical enclosures. He now practices as an independent acoustical…
Friday, February 7, 2003 4:00 p.m. Jack Evans, P.E. JEAcoustics http://www.jeacoustics.com JEAcoustics is an acoustical consulting firm specializing in architectural acoustics, mechanical, and environmental noise and vibration. Two of our recent cases involving environmental noise control are discussed in this seminar. The first involves an air-cooled chiller with rotary screw compressors installed at a new…
Friday, January 31, 2003 4:00 p.m. Nathan Crow Applied Research Laboratories The University of Texas at Austin http://www.arlut.utexas.edu Applied Research Laboratories has developed a diver-held sonar system for the U.S. Navy’s Naval Special Clearance Team One. This system, called the Integrated Navigation Sonar Sensor (INSS), was designed to find mines in the very shallow water…
Friday, January 24, 2003 4:00 p.m. Dr. Marcia Isakson Applied Research Laboratories The University of Texas at Austin http://www.arlut.utexas.edu An accurate model of sediment acoustics is critical to understanding shallow water sound propagation and the detection and classification of buried objects such as mines. Indeed, as SONAR becomes more important in shallow water operations, an…