CONTINUOUS SELF-LOCKING SPIRAL WOUND SEAL NASA Case No. LAR-12315-1 Address inquiries to: Langley Station Hampton, VA 23665 Corresponding to U.S. Patent No. 4,309,039 Filed 11-20-79. A spiral wound seal for effecting a seal between two surfaces. The seal consists of a strip of gasket material wound into a groove machined into one of the surfaces. The gasket strip is wider than the groove is deep such that a portion of the gasket material protrudes from the groove. The seal is effected by clamping the second surface onto the first surface and thereby compressing the protruding gasket material. GELS AS BATTERY SEPARATORS FOR NASA Case No. LEW-12364-1 Inventor: Dean W. Sheibly, et al. Address inquiries to: Lewis Research Center 21000 Brookpark Road Corresponding to U.S. Patent No. 4,018,971 Filed 7-20-76 Issued 4-19-77 Gels are formed from silica powders and hydrochloric acid. The gels can then be impregnated into a polymeric foam and the resultant sheet material can then be used in applications where the transport of chloride ions is desired. Specifically disclosed is the utilization of the sheet in electrically rechargeable redox flow cells which find application in bulk power storage systems. *Japanese manufacturing rights exclusively licensed to Japan Engineering Development Company. See page 23 for address. All other foreign patent rights available from NASA. 81 The invention is a new and improved, high power, microwave GaAs FET which minimizes losses in impedance matching networks and inactive zones (electrode segments that are not superimposed on an active region) of the FET by limiting the total active area of each unit cell of the FET and by matching or partially matching the impedances of each unit cell to the source and load if a plurality of unit cells are combined in a single device having the usual external source, drain and gate electrodes. To minimize losses in the inactive zones of each device, matching networks are physically located immediately adjacent the GaAs active region of the high power, microwave GaAs FET and are actually part of the FET electrodes. By placing the matching networks within the device and immediately adjacent the active region, the area and therefore losses of the inactive zone are minimized. A linear magnetic bearing having mutually orthogonal x, y and z axes comprises a stationary stator member and a relatively long movable member. The movable member is controlled so that it is centered on the z axis. One of the members includes permanent magnet means for positioning the movable member relative to the stationary member. A sensor controls electro-magnet means on one of the members, to center the longitudinal axis of the movable member on the z axis. A radial air gap is established between the members. The members include means for establishing first low reluctance magnetic flux paths for the permanent magnet means through both of the members and the air gap and second low reluctance magnetic flux paths for the electro-magnet means through both of the members and the air gap so that no net forces are applied to the movable member in the direction of the z axis by either the permanent magnet means or the electro-magnet means. The first and second low reluctance flux paths are arranged so that flux from the electro-magnet means does not flow through the high reluctance permanent magnet means. The linear magnetic motor/generator includes an axially movable actuator mechanism. A permanent magnet mechanism defines a first magnetic flux path which passes through a first end portion of the actuator mechanism. Another permanent magnet mechanism defines a second magnetic flux path which passes through a second end portion of the actuator mechanism. A drive coil defines a third magnetic flux path passing through a third central portion of the actuator mechanism. A drive coil selectively adds magnetic flux to and subtracts magnetic flux from magnetic flux flowing in the first and second magnetic flux paths and, respectively, for supplying an axial force to the actuator mechanism. |