Friday, March 31, 2006 4:00 p.m. Dr. Nicholas P. Chotiros Applied Research Laboratories, The University of Texas at Austin http://www.arlut.utexas.edu Bottom backscatter is often the dominant component of reverberation for sonars operating in the band from 10 to 500 kHz in littoral waters. In the frequency band chosen, the scatterers are mainly confined to the…
Friday, March 24, 2006 4:00 p.m. Todd Hay and Professor Mark Hamilton Applied Research Laboratories, The University of Texas at Austin http://www.arlut.utexas.edu Bubbles are ubiquitous in liquids. While frequently imperceptible, they are manifest as impurities in all liquids, including blood and other bodily fluids. Bubbles thus provide nucleation sites for cavitation when subjected to the…
Friday, February 24, 2006 4:00 p.m. Dr. Terry L. Henderson Applied Research Laboratories, The University of Texas at Austin http://www.arlut.utexas.edu The talk will describe problems encountered in conducting Synthetic Aperture Sonar experiments at Lake Travis, and their solutions. Synthetic Aperture Radar (SAR) systems have been in use since the 1960s. However, it has been considerably…
Friday, February 17, 2006 4:00 p.m. Michael Stone Department of Mechanical Engineering, The University of Texas at Austin http://www.me.utexas.edu and Institut d’ Electronique, de Microelectronique et de Nanotechnologies Ecole Centrale de Lille, Villeneuve d’ Acsq, France http://www.iemn.univ-lille1.fr The seminar will begin with a brief introduction to the topic of wave phase conjugation, which for a…
Friday, February 10, 2006 4:00 p.m. Mark Wochner Applied Research Laboratories, The University of Texas at Austin http://www.arlut.utexas.edu A computational acoustic propagation model based upon the Navier-Stokes equations was developed that is able to simulate the effects of absorption and dispersion due to shear viscosity, bulk viscosity, thermal conductivity, and molecular relaxation of diatomic nitrogen…
Friday, February 3, 2006 4:00 p.m. David A. Nelson, INCE Bd. Cert., P.E. Principal Consultant, Nelson Acoustics, Elgin, Texas Consultant in Noise Control for Products, Equipment, Industry, and the Environment Fan-cooled devices are ubiquitous in present-day technology and are widely recognized by the general public as a source of objectionable noise. In spite of this,…
Friday, January 27, 2006 4:00 p.m. Professor Robert Flake Department of Electrical and Computer Engineering, The University of Texas at Austin http://www.ece.utexas.edu To paraphrase Walker Tire Company: If we find them, they exist and we have them. You are invited to come see some found. Experiments conducted during the seminar will demonstrate, with live measurements,…
Friday, December 2, 2005 4:00 p.m. Bill McKenna Acoustic Systems Austin, Texas http://www.acousticsystems.com/index.htm Acoustic Systems, located in Austin, Texas, has been designing, manufacturing, and installing acoustical products since 1971. While Acoustic Systems does offer standard products, our focus is on custom designs, manufactured per customer specifications. Acoustic Systems is staffed by highly qualified sales professionals…
Friday, November 18, 2005 4:00 p.m. Dr. Marcia Isakson Applied Research Laboratories The University of Texas at Austin http://wwwext.arlut.utexas.edu Unconsolidated sediments comprise much of the world’s littoral ocean bottoms. Therefore it is important to understand the acoustics of these materials in order to model long range coastal propagation and shallow water sediment characterization. However, the…
Friday, November 11, 2005 4:00 p.m. Professor Michael J. Ryan Section of Integrative Biology The University of Texas at Austin http://www.sbs.utexas.edu/ryan Most of the 5000 frog species produce mating calls that females use to identify appropriate mates. The call of the tungara frog has two components, the whine is necessary and sufficient for females to…
Wednesday, November 2, 2005 3:00 p.m. Dr. Fernando García-Osuna Sugar Land Technology Center, Schlumberger Corporation http://www.schlumberger.com Acoustic measurements for geophysical well logging were introduced in the oil industry in the mid-1920s as a companion to seismic exploration to measure compressional velocity. In the 1950s researchers at universities, oil, and service companies extended the theory of…
Friday, October 28, 2005 4:00 p.m. Professor George D. Pollak Section of Neurobiology Institute for Neuroscience and Center for Perceptual Systems The University of Texas at Austin http://www.biosci.utexas.edu/neuro Bats are best known for their echolocation abilities but they also are among the most colonial of mammals, living in caves with populations that can number in…
Friday, October 14, 2005 4:00 p.m. Soonkwon Paik and Dr. Elmer L. Hixson Department of Electrical Engineering The University of Texas at Austin http://www.ece.utexas.edu The goal of this project was to design and implement a microphone array suitable for hands-free cell phone use in a car. The acoustical environment of a car interior was investigated.…
Friday, October 7, 2005 4:00 p.m. Anderson Mills Department of Electrical Engineering The University of Texas at Austin http://www.ece.utexas.edu This Presentation is focused upon the audio analysis involved in the creation of a “pseudo-score” for electro-acoustic music. This research was undertaken because the lack of an objective visual representation prevents music theorists from being able…
Friday, September 30, 2005 4:00 p.m. Jack B. Evans JEAcoustics Austin, Texas http://www.jeacoustics.com The University of Texas at Austin has an on-campus electrical power generation plant with steam turbine generators. The plant is surrounded by academic teaching and laboratory buildings, in which more sensitive laboratory spaces have experienced vibration disturbances in the past. A planned…
Friday, September 16, 2005 4:00 p.m. Dr. Stephan J. Bless Institute for Advanced Technology The University of Texas at Austin http://www.iat.utexas.edu Impact regimes are characterized by the ratio of inertial stresses to strength. “Hypervelocity” refers to impacts where the role of target strength is relatively small. Well known examples are planetary craters. Others are space…
Friday, May 6, 2005 4:00 p.m. Douglas F. Winker Department of Electrical Engineering The University of Texas at Austin http://www.ece.utexas.edu Speech intelligibility in rooms, particularly ones that are highly reverberant, is often difficult to achieve. Typical loudspeaker applications require multiple installation locations, and compromises in audience coverage must often be made. The acoustic environment of…
Friday, April 29, 2005 4:00 p.m. Dr. Alexandre A. Kolomenskii Department of Physics Texas A&M University Home Recent developments in laser technology enable studies of elastic properties of materials at different scales ranging from centimeters to nanometers. In this talk some examples will be presented that include studies with focused and straight-crested surface acoustic waves…
Friday, April 1, 2005 4:00 p.m. Chris E. Peterson Dell Enterprise Acoustical Engineering Round Rock, Texas Computer products generate noises that vary in the degree of annoyance to target customers. The goals of acoustical engineering in the computer industry are the following: – Characterize signatures of acoustical noise – Predict impact of various types of…
Wednesday, March 23, 2005 3:00 p.m. in ETC 2.132 Professor Christy K. Holland Department of Biomedical Engineering University of Cincinnati http://www.eng.uc.edu/dept_biomed Stroke is the third leading cause of death and the leading cause of disability in the United States. Thrombolytics, or clot-busters, such as recombinant tissue plasminogen activator (rt-PA) have advanced the treatment of ischemic…