Abstract: An electroluminescent edge emitting device having an improved operational life and electroluminescent efficiency includes a host material composed of at least two Group II elements and at least one element selected from Group VIA. The host material is doped with at least one of the rare earth elements in its 3+ or 2+ oxidation state. In one embodiment of the invention, two Group IIB elements are selected, namely cadmium and zinc. In an alternate embodiment, three Group IIA elements, magnesium, calcium and strontium, are selected as the host material. The Group VIA element is sulfide and/or selenide. The dopant is composed of one, two or three elements selected from the rare earth elements (lanthanides). In an alternate embodiment, the dopants include Mn.sup.2+ and one or two of the lanthanides.

Abstract: A system is disclosed for conserving power in a robotic arm device. The robotic arm device is responsive to a motion command and controlled by a servo loop having a motor, a motor driver, and a motor encoder. The system positions the robotic arm to a stow position when the time since a last motion command exceeds a predetermined power shut down time. When the robotic arm has reached the stow position, power is removed from the motor and the motor drivers by opening the servo loop. Thus, power is conserved while the robotic arm rests in its stow position. When a new command is received, the servo loop is closed and power is applied to position the robotic arm to its desired position.

Abstract: A technique is disclosed for processing audio-video data in a storage medium where indexes are generated by automatically extracting and indexing words and pictures in the audio-video data with their corresponding timing or other location data. The indexes permit searching and selective retrieval of word and/or scene data in accordance with location data associated therewith.