Abstract: In an apparatus for managing area data, the first data structure for area management includes: a first index data structure including a first root node corresponding to a first set of areas containing a first area, first non-leaf nodes, and first leaf nodes; and a first data storage corresponding to the first leaf nodes. The second storage for area data stores one or more second data structures for area management constructed on the basis of area data collected from data in the first storage for area data based on one or more area attributes designated by a user. The second data structure for area management includes: a second index data structure including a second root node corresponding to a second set of areas containing second areas collected based on the one or more area attributes designated, second non-leaf nodes, and second leaf nodes; and a second data storage corresponding to the second leaf nodes.

Abstract: Disclosed are magnetic domain (bubble) memory arrays and correlator type memory arrays in uniaxially anisotropic crystals which utilize wavering loop conductor patterns at each bit location defining three contiguous magnetic domain retaining regions. On current reversal a bubble in the center loop of a wavering loop pattern will be equally attracted to either of the outside loops. Decision control is provided by a second array of two conductor lines interposed between the respective domain retaining regions. These control conductors establish an aiding or inhibiting magnetic field when current flows through them. In an alternate design a correlator function is obtained by using bubbles retained in previously disclosed bistable loops as memory elements and interrogating them by means of auxiliary bubbles driven by adjacent wavering loops.

Abstract: A multi-state memory cell which uses magnetic bubble domains in uniaxial material is described. The cell includes a channel in which a number of stable bubble positions separated by barriers is formed and on which select conductors are positioned to switch a bubble from one stable position to another on a threshold basis by means of coincident currents. A cell in accordance with this invention may take the form of a four-state-two conductor cell, two-bistable-state two-conductor cell, multi-state six conductor cell and six-state three-conductor cell and include destructive or non-destructive readout.

Abstract: A photomagnetic image pickup element and system, the element comprising a thin film of magnetic material capable of having magnetic bubbles formed therein where the intensity of the magnetic-bubble collapse field varies with temperature; a first conductor pattern disposed on one side of the thin film; and a second conductor patterndisposed either on the one side or on the other side of the thin film, the first and second conductor patterns being so disposed with respect to one another as to form a lattice shape on the thin film.