Active control of waves in a cochlear model with subpartitions.

Multiscale asymptotic methods developed previously to study macromechanical wave propagation in cochlear models are generalized here to include active control of a cochlear partition having three subpartitions, the basilar membrane, the reticular lamina, and the tectorial membrane. Activation of outer hair cells by stereocilia displacement and/or by lateral wall stretching result in a frequency-dependent force acting between the reticular lamina and basilar membrane. Wavelength-dependent fluid loads are estimated by using the unsteady Stokes' equations, except in the narrow gap between the tectorial membrane and reticular lamina, where lubrication theory is appropriate. The local wavenumber and subpartition amplitude ratios are determined from the zeroth order equations of motion. A solvability relation for the first order equations of motion determines the subpartition amplitudes. The main findings are as follows: The reticular lamina and tectorial membrane move in unison with essentially no squeezing of the gap; an active force level consistent with measurements on isolated outer hair cells can provide a 35-dB amplification and sharpening of subpartition waveforms by delaying dissipation and allowing a greater structural resonance to occur before the wave is cut off; however, previously postulated activity mechanisms for single partition models cannot achieve sharp enough tuning in subpartitioned models.

The application of electricity to the dispersion of fog ...

Typewritten ms.

Interaction of waves and currents /

This report presents an overview of wave-current interacion, including comprehensive review of references to significant U.S. and foreign literature available through December 1981. Specific topics under review are the effects of horizontally and vertically varying currents on waves, wave refraction by currents, dissipation and turbulence, small- and medium-scale currents, caustics and focusing, and wave breaking. The results of the review are then examined for engineering applications. The most appropriate general-purpose computer program to include wave-current interaction is the Dutch Rijkswaterstaat program CREDIZ, which is based on a parabolic wave equation. Further applications include wave and current forces on structures and possibly sediment transport. The report concludes with a brief state-of-the-art review of wave-current interaction and a list of topics needing further research and development.

CALINE2 - an improved microscale model for the dispersion of air pollutants from a line source. Interim report.

Federal Highway Administration, Washington, D.C.

Effects of oil slick properties on the dispersion of floating oil into the sea /

Bibliography: p. 321-326.

A study to conduct experiments concerning turbulent dispersion of oil slicks /

Final report; April 1978.

Energy losses of waves in shallow water /

"February 1982."

Propagations of waves in solid media.

"Work carried out for the Applied Physics Laboratory, Johns Hopkins University under Contract no. APL/JHU, P. O. no. 33031-2."

Time of travel and dispersion of solutes in a 36.4-mile reach of the North Platte River downstream from Casper, Wyoming /

Bibliography: p. 17.

The effect of waves on the ideal fluid forces acting on a slender axisymmetric body having three degrees of freedom /

Mode of access: Internet.

The enemies of the Constitution discovered; or, An inquiry into the origin and tendency of popular violence. Containing a complete and circumstantial account of the unlawful proceedings at the City of Utica, October 21st, 1835; the dispersion of the State Anti-Slavery Convention by the agitators, the destruction of a democratic press and of the causes which led thereto; together with a concise treatise on the practice of the court of His Honor Judge Lynch. Accompanied with numerous highly interesting and important documents.

Mode of access: Internet.

Ancient history : from the dispersion of the sons of Noe, to the battle of Actium and change of the Roman republic into an empire /

Includes bibliography.

Performance characterization and relative dispersion of drogued drifters deployed in the fjords of Nootka Sound

Senior thesis written for Oceanography 445