Abstract: A filter which uses both an analog portion and a digital portion to optimize the filter performance. A simple analog filter provides a rough filtering of the input signal. The output of the analog filter is converted into digital form and supplied to a digital filter. The coefficients of the digital filter are changed by a digital computer in order to correct for the errors in the filtered signal produced by the analog filter. The coefficients necessary for the digital filter to provide an error offset are determined by comparing the filtered value of a test signal through the analog filter to an ideal filtered value of such test signal.

Abstract: a ratating sensor responsive to infrared or electro-optic radiation has a nearly hemispherical field of view. The sensor comprises a rotating platform (3) supporting a planar multidetector focal plane array (1). The array (1) has three or four sides. Two of the sides are straight lines. One or two sides are portions of conic sections. Individual detectors (2) within the array (1) can be continuous or discrete, and are organized into rows generally following the shape of the conic section(s). In either embodiment, time delay integration is performed row by row within the array (1) so as to equalize the sensitivity and resolution for each portion of the viewed scene. Several arrays (1) can be mounted within the carrier vehicle (8), mounted at different field angles. In this embodiment, the shape of the arrays (1) vary from a sector of a circle to rectangular.

Abstract: A power steering system for an automotive vehicle including a power steering gear, a fluid pressure pump for developing steering pressure and an electromagnetic clutch for connecting the pump to an engine driven pulley at low vehicle speeds and for disabling the pump at high vehicle speeds, and an electric circuit that prevents activation and deactivation of the pump during turning maneuvers.

Abstract: Thermosetting compositions comprising: (A) a sulfonic acid ester comprising the reaction product of an epoxy functional polymer bearing hydroxyl functionality, and a sulfonic acid having the formula ##STR1## wherein R is selected from linear or branched alkyl groups and aryl groups; and (B) an amine aldehyde crosslinking agent.During cure of the composition, component (A) breaks down to form not only a reactive sulfonic acid catalyst, but also the hydroxy functional film forming material which crosslinks with the amine aldehyde crosslinking agent.

Abstract: This disclosure teaches a method of making a silicon carbide article of less than full density. A mixture of silicon carbide particles, silicon particles and a thermosetting polymeric material are molded to form an article as a green body. The green body is pyrolyzed to change the polymer into carbon and the carbon is then changed into silicon carbide by the silicon contained in the mixture.