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公开(公告)号：CA1331480C
公开(公告)日：1994-08-16
申请号：CA566244
申请日：1988-05-06
Applicant: IBM
Inventor： DAVIDSON ARTHUR , DINGER TIMOTHY R , GALLAGHER WILLIAM J , WORTHINGTON THOMAS K
Abstract: HIGH CURRENT CONDUCTORS AND HIGH FIELD MAGNETS USING ANISOTROPIC SUPERCONDUCTORS Improved conductors and superconducting magnets are described utilizing superconducting materials exhibiting critical field anisotropy. This anisotropy is one in which the ability of the superconductor to stay in a superconducting state depends on the orientation of a magnetic field applied to the superconductor with respect to the direction of current flow in the superconductor. This anisotropy is utilized in the design of conductors and magnet windings comprising the superconductive material and specifically is directed to magnet windings in which the direction of high critical current through the superconductor is parallel to the magnetic field produced by current in these windings in order to obtain high critical fields. Particularly favorable examples of a superconducting material are the so-called high Tc superconductors in which the primary supercurrent flow is confined to 2 dimensional Cu-O planes. By arranging the superconductive windings so that the Cu-O planes are substantially parallel to the magnetic field produced by current in these windings, the windings will be able to withstand high fields without being driven normal. This maximizes the magnetic field amplitudes that can be produced by the magnet.
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公开(公告)号：CA1171498A
公开(公告)日：1984-07-24
申请号：CA347837
申请日：1980-03-17
Applicant: IBM
Inventor： THOMPSON DAVID A , WORTHINGTON THOMAS K
Abstract: CODING SCHEMES FOR ACOUSTIC DELAY LINE DATA COLLECTION SYSTEM A magnetoacoustic system adapted to use as a keyboard can employ a serpentine acoustic delay line passing under a number of transducers which are activated simultaneously with a current pulse through the wire. Magnets adjacent to the wire generate magnetoacoustic pulses along the wire which arrive sequentially at a sensor at one end of the line. For each key on a keyboard at least two magnets are associated with each key position with one magnet affixed in position and one reciprocably movable towards and away from the wire in a response to actuation of the key. The magnet which remains close to the wire is used to provide a "location" signal indicating the location along the delay line provided by the wire by producing an acoustic pulse for that point on the wire for each clock pulse of current which passes through the wire. The second magnet located adjacent to the first magnet generates a pulse simultaneously with the other magnets when the current pulse YO978-057 passes through the wire, but it is delayed by the physical displacement along the wire, so it is received at a different time than the pulse from the other magnet. The data pulse can follow or precede the location pulse so long as the presence of one or both can be readily decoded. A three magnet key arrangement can be employed where it is desired to be able to use three positions per key. YO978-057
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