Abstract: The technology provides embodiments for a waveguide including gaps which turn the direction of light. Each of a plurality of planes located within a waveguide includes a group of gaps so that each of the gapped planes partially reflects out of the waveguide light within a first angle range and transmits down the waveguide light received within a second angle range. In some examples, the waveguide is formed by joining optically transparent sections, and each group of gaps is formed in a surface of each optically transparent section which becomes a joining surface when bonded with an abutting all flat surface of an adjacent section. The waveguide may be used in displays, and in particular in near-eye displays (NED)s.

Abstract: The technology provides embodiments for a waveguide including gaps which turn the direction of light. Each of a plurality of planes located within a waveguide includes a group of gaps so that each of the gapped planes partially reflects out of the waveguide light within a first angle range and transmits down the waveguide light received within a second angle range. In some examples, the waveguide is formed by joining optically transparent sections, and each group of gaps is formed in a surface of each optically transparent section which becomes a joining surface when bonded with an abutting all flat surface of an adjacent section. The waveguide may be used in displays, and in particular in near-eye displays (NED)s.

Abstract: A system wherein control of a safety-critical system operation is effected by sending a plurality of keywords via a low integrity transmission means.

Abstract: A door stile structure utilizing a pair of skins. An elongated member extends between at least a portion of the pair of skins. The elongated member includes an outer surface having a pair of ridges with a recessed portion therebetween. The ridges lie in a plane which intersects the edge of the door. The elongated member may lie flush with the edges of the skins forming the door or be imbedded within the skins to lock the elongated member into the door structure.

Abstract: Compound preforms are provided having a first region, including a porous ceramic and a second region including a porous or solid ceramic in which the two regions differ in composition. The compound preform is infiltrated with a liquid metal which is then solidified to form a metal matrix composite.

Abstract: Compound preforms are provided having a first region, including a porous ceramic and a second region including a porous or solid ceramic in which the two regions differ in composition. The compound preform is infiltrated with a liquid metal which is then solidified to form a metal matrix composite.

Abstract: A door stile structure utilizing a pair of skins. An elongated member extends between at least a portion of the pair of skins. The elongated member includes an outer surface having a pair of ridges with a recessed portion therebetween. The ridges lie in a plane which intersects the edge of the door. The elongated member may lie flush with the edges of the skins forming the door or be imbedded within the skins to lock the elongated member into the door structure.

Abstract: Compound preforms are provided having a first region, including a porous ceramic and a second region including a porous or solid ceramic in which the two regions differ in composition. The compound preform is infiltrated with a liquid metal which is then solidified to form a metal matrix composite.

Abstract: A door lamination structure including a core member with first and second surfaces separated by an endless edge third surface. A groove extends around the endless third surface and forms a chamber in the core. First and second sheets of protective material are placed over the first and second surfaces respectfully. A fastener holds the first and second sheets to the chamber of the groove.

Abstract: A system of the present invention includes a relational database management system (RDBMS). Methods are described for maintaining integrity between "design documents," which may be creating under different operating systems, and one or more information tables of the system. The system provides each field of a table with a unique ID ("field ID") for tracking the field regardless of restructuring changes which may be made to the table by various clients. Corresponding field IDs are stored with the fields of design documents, thereby permitting the system to maintain a link between a design document and its table. Upon a restructure of a table, the dependent design documents may be appropriately updated by their respective clients. Methods are also described for improved storage of free-form or "memo" data. In a preferred embodiment, memo data are stored in a separate file comprised of variable-length storage blocks.