This study is the first attempt to classify seizures and to characterise epilepsy in a referral-based equine population. Predictive factors of epilepsy in horses were similar to those reported in other species and may assist the clinician with the early diagnosis of epilepsy.

The majority of the seizures described were focal seizures with or without secondary generalisation. The clinical presentation was independent of the underlying disease.

The presence of ultrasonic surface waves of various modes on a fluid-porous solid interface is demonstrated and their velocities measured. The experimental technique (developed earlier by one of the authors for a fluid-isotropic solid interface) utilizes reflected broadband spectra from periodic surfaces. Three sharp re'raima corresponding to three mode-converted waves coupled to the porous solid are observed. The velocities of these "surface" waves are in qualitative agreement with theoretical predictions [S. Feng and D. L. Johnson, J. Acoust. Soc. Am. 74, 906 (1983) and 74, 915 (1983) ] and are identified as pseudo Rayleigh, pseudo Stoneley, and true Stoneley waves.

A study of ultrasonic surface and bulk waves in saturated porous solids [43.35.Pt, 43.35.Yb, 43.20.Hq]--Michael Mayes, Welding Engineering, The Ohio State University, Columbus, OH 43210, •4pril 1986 (M.S.). The presence of ultrasonic surface waves of various modes on a water-fluidsaturated porous solid interface is demonstrated and their velocities are measured. A new surface mode believed to be associated with the Blot bulk "slow" compressional wave has been detected. Porous material bulk wave measurements have been made and a "wedge" technique is presented for enhancing slow wave detection. The experimental technique for measuring surface modes utilizes reflected broadband spectra from periodic surfaces. Usually, two, and in certain cases, three minima corresponding to mode coupling of incident waves into surface waves at the water-porous solid interface are observed. The velocities of the observed surface waves are in qualitative agreement with theoretical predictions [ S. Feng and D. L. Johnson, J. Acoust. Soc. Am. 74, 906 (1983) ]. Finally, the above slow bulk wave and surface wave measurement techniques are applied on rock samples. Thesis Advisor: Laszlo Adler.ceiver. Before estimating BRL, this extraneous loss (called bottom transmission loss, BTL) must be removed. The developed BRL computation method, called the grazing angle matching empirical method (GAME),

The presence of ultrasonic surface waves of various modes on a fluid-porous solid interface is demonstrated and their velocities are measured. The experimental technique developed earlier [A. Jungroan et al., J. Appl. Phys. 53, 4672 (1982)] for a fluid-isotropic solid interface utilizes reflected broadband spectra from periodic surfaces. Three sharp minima corresponding to mode coupling of incident waves into surface waves at the fluid-porous solid interface are observed. The velocities of these surface waves are in qualitative agreement with theoretical predictions [S. Feng and D. L. Johnson, J. Acoust. Soc. Am. 74, 906 (1983)] and are identified as pseudo-Rayleigh, pseudo-Stoneley, and true Stoneley waves. [This work is supported by the U.S. Department of Energy through Lawrence Livermore National Laboratory.]