Interdisciplinary Research in Physics: Mathematical Aspects of Hamiltonian Theories for the Ocean, Environmentally Adaptive Sonar Controller, Influence of Local Variation in Surficial Sediment Porosity on the Spacial Distribution of Bacterial Numbers and Activity, Response of Gas-Filled Bubble to an Ultrasound Beam

摘要

The purpose of this grant was to create a program of high quality fundamental research which brings together collaborative research between APL and other academic units of the University of Washington. The research was in four major areas: (1) To determine the usefulness of the Hamiltonian formalism for numerical modeling of ocean flow fields, including internal waves and to clarify the nature of conservation laws. (2) To build a ship sonar controller that will automatically tune onboard systems to maximize the performance of the sonar for undersea detection of threat submarines in the face of changing ocean environmental conditions. (3) To obtain the spatial heterogeneity of sediment porosity on the centimeter scale in order to interpret high frequency bottom backscatter acoustic data and to access the impacts of biological activities on the variation of sediment heterogeneity. (4) To obtain, through experimental measurements, the fundamental physical and acoustical properties of stabilized gas-filled microbubbles (ultrasound contrast agents).