Abstract: A Doppler velocity spectrum produced by radial projection in a two-dimensional Fourier frequency domain is processed to suppress alias spectral terms. The projected spectrum is divided into windows using an iterative algorithm which centers the spectral mean. The window containing data samples which maximizes a weighted score based upon the width and maximal value of samples within the window is used to determine which window contains true spectral components. Spectral components in other windows are then suppressed.
Abstract: A process for densifying a ceramic part includes creating an oxygen-containing sealed atmosphere, heating and pressurizing a ceramic part within the oxygen-containing sealed atmosphere to a high temperature and a high pressure, soaking the part at the high temperature and high pressure, and then cooling the part to ambient temperature and ambient pressure.
Type:
Grant
Filed:
May 21, 1987
Date of Patent:
August 13, 1991
Assignee:
North American Philips Corporation
Inventors:
Larry A. Wank, Joseph G. Braitling, Marie Kaczenski