A variety of statistically steady energy spectra in elastic wave turbulence have been reported in numerical simulations, experiments, and theoretical studies. Focusing on the energy levels of the system, we perform direct numerical simulations according to the Föppl-von Kármán equation, and successfully reproduce the variability of the energy spectra by changing the magnitude of external force ...

In this study, we analyze the refraction of long oceanic waves at the Gulf Stream’s north wall off the Florida coast as observed in imagery obtained from the RADARSAT-1 synthetic aperture radar (SAR) during the passage of Hurricane Bonnie on August 25, 1998. The wave spectra are derived from RADARSAT-1 SAR images from both inside and outside the Gulf Stream. From the image spectra, we can deter...

By cross-correlating successive ultrasonic scans of the biological tissue that is excited by a transient source on the surface, recent experiments show that elastic wave displacement during the interval between the two scans can be measured everywhere in the tissue. Assuming that we know the displacement history, w(t, x), of a propagating shear wave everywhere, we identify the stiffness change ...

In this paper, the surface displacement response of a-nite uid{loaded shell and the resulting far eld acoustic pressure are studied. A high resolution signal processing algorithm is applied to the surface displacement to estimate the constituent wave numbers and corresponding amplitudes for these wave components. This parameter estimation technique identiies the uid{loaded cylinder's complex di...

Synthetic aperture radar offers high resolution images of a static scene while moving objects are often smeared and displaced in azimuth. Ground moving target indication with a monopulse system makes it possible to correct the azimuth displacement and measure an accurate individual radial velocity component of moving targets via special processing techniques. The presented method requires the f...

A three-wave coupling model with complex linear frequencies is investigated for the nonlinear interaction in a triad that has linearly unstable and stable modes. Time scales associated with linear and nonlinear physics are identified and compared with features of the frequency spectrum. From appropriate time scales, the frequency spectra are well characterized even in the transition to the stea...

Synthetic Aperture Radar (SAR) has been recognized as a powerful tool for modeling ocean waves and forecasting over an area of 300 km x 300 km. The quantitative descriptors of the ocean surface wave properties such as wave height and wave slope spectra can retrieve from several satellite SAR missions, such as ENVISAT ASAR data.The retrieving techniques of sea surface quantitative descriptors in...