The October 2004 High Blood Pressure Research Council meeting of the American Heart Association included a debate on the proposition that “aortic diameter, aortic stiffness, and wave reflection all increase with age and in isolated systolic hypertension.” This was stimulated by a series of articles1–5 that took a contrary position to change in aortic diameter and wave reflection and placed emph...

Abstract. In this paper, a two-parameter discrete Gaussian beam summation is described and then applied to SH seismic waves in a layer over a half space. For this case the exact solution for the wide-angle reflection and head wave is known by the summation of plane waves or from the modified-Cagniard method. Using Gaussian beam summations over a single angle parameter, the wide-angle reflection...

In this paper, a two-parameter discrete Gaussian beam summation is described and then applied to SH seismic waves in a layer over a half space. For this case the exact solution for the wide-angle reflection and head wave is known by the summation of plane waves or from the modified-Cagniard method. Using Gaussian beam summations over a single angle parameter, the wide-angle reflection and head ...