Abstract: 5.

Abstract: A digital detection criteria control device for use in a radar tracking system incorporating a memory that is electronically synchronized to a surveillance radar in a manner to perform video mapping and control functions. This memory is organized so that each small quantum area of the radar's surveillance area has code bits which are controlled primarily by inputs from valid and invalid video return detectors. These detectors examine quantized video returns from the radar for certain bit densities and bit patterns to determine whether the video returns are valid or invalid targets. The code bits provide a history of the type of video return for each quantum area thereby making a more accurate indication of the nature of the video return possible.

Abstract: 1.

Abstract: Large, strain free, single crystals of high optical quality selected from the IB-VB-VIB and IIIB-VB-VIB ternary chalcogenide groups, having a single stable solid phase from room temperature to the melting point of the crystal and vice-versa, are synthesized by (1) placing stoichiometric quantities of the compound constituents with 3% excess VIB constituent in a two part, sublimation-reaction fused silica tube, the VB constituents being placed in sublimation part, and the remaining constituents being placed in the reaction part, and evacuating and sealing the tube, (2) subliming and purifying the VB constituent and condensing it in the reaction part, which is then cooled and sealed from the sublimation part, (3) reacting, uniting and slowly cooling the reaction part constituents, (4) placing the reacted constituents in fused silica growth tube, which is evacuated, backfilled with helium, and sealed, (5) forming a melt in the upper part of a two part furnace and lowering at about 1.8 mm/hr.