Wednesday, November 14, 1984 12:00 p.m. David T. Blackstock Applied Research Laboratories The University of Texas at Austin In 1821-22, during an exploration voyage to northern North America to try to discover a “Northwest Passage” (a quick route to the Pacific Ocean), some measurements of the speed of sound were made. The time between the…
Wednesday, November 7, 1984 12:00 p.m. Jim Hawkins Applied Research Laboratories The University of Texas at Austin The U.S. Government has built and is operating several wind turbine systems as part of its Federal Wind Energy Program. We have acquired a ‘canned’ slide presentation describing some of the machines and sites involved. These slides will be…
Wednesday, October 31, 1984 12:00 p.m. Ilene Busch-Vishniac Department of Mechanical Engineering The University of Texas at Austin The typical means of modeling a transducer is to represent its behavior using discrete lumped elements. In such a model the transducer exists at a point in space and thus the distributed nature of the transducer is…
Wednesday, October 24, 1984 12:00 p.m. Whang Cho Department of Mechanical Engineering The University of Texas at Austin Simplified analysis shows that the decay rate of the transient response decreases as the frequency mode increases.
Wednesday, October 17, 1984 12:00 p.m. Halvor Hobæk Department of Physics The University of Bergen Bergen, Norway Computations show that the nearfield of a spherical piston -in the sense that the directional properties are dependent on range- extends much farther out than for a plane source of similar dimensions. The reason for this can be seen by…
Wednesday, September 26, 1984 12:00 p.m. Yves H. Berthelot Applied Research Laboratories The University of Texas at Austin A thermoacoustic array can be generated by modulating the intensity of a laser beam illuminating a liquid. The nearfield directivity pattern of a thermoacoustic array is found by taking the Fourier transform of the impulse response of…
Wednesday, September 19, 1984 12:00 p.m. Professor Mark F. Hamilton Department of Mechanical Engineering The University of Texas at Austin Finite amplitude propagation of directional sound beams is well modeled by Kuznetsov’s paraxial wave equation, which accounts consistently for nonlinearity, diffraction, and absorption. The solution of Kuznetsov’s equation is found in the form of a…
Wednesday, September 12, 1984 12:00 p.m. Alex Garcia Applied Research Laboratories The University of Texas at Austin The field of ordinary Stochastic Differential Equations (SDE) has in the past 20 years progressed from the dangerous and unexplored jungles of the cutting edge of analysis to the paved and well-lit treatments in undergraduate texts. Soon most…