Abstract: A super-conducting magnet for magnetic resonance imaging systems comprising symmetrically located back-to-back C-frame magnets.

Abstract: A hybrid shielding arrangement for solenoid type cryogenic magnets used in MR systems uses both active and passive shielding elements to improve the effective shielding.

Abstract: A magnet assembly, particularly for use in NMR imaging apparatus, comprises a plurality of nested, coaxial coils (2-5). The radius and number of turns of the coils (2-5) are such that when working currents flow through the coils substantially uniform magnetic field is generated in a homogeneous region (16).

Abstract: A magnet assembly (1) particularly for use in NMR apparatus comprises a first superconducting coil assembly (A,A'-C,C') for generating a first magnetic field; and a second superconducting coil assembly (D-F) for generating a second magnetic field. The second superconducting coil assembly (D-F) is electrically connected in series with the first superconducting coil assembly (A,A'-C,C'). Each coil assembly (A,A'-C,C'; D-F) generates magnetic fields where corresponding components are of substantially the same order of magnitude whereby a resultant, uniform magnetic field is generated in a working volume (3). The second magnetic field opposes the first magnetic field externally of the magnet assembly (1).

Abstract: A magnet system comprises magnetic field generating means such as a superconducting magnet (12) and a shield including a number of sheets (9) of magnetic material, the size (l.sub.z, l.sub.x) and position (r) of the or each sheet (9) relatively to the magnetic field generating means (12) being such that in use at the edge of the sheet or sheets the component of magnetization (M.sub.z) parallel to the sheet in the direction of the magnetic field is less than or substantially equal to zero.

Abstract: Disclosed are two improved container alloys for radioactive nuclear waste. Radioactive nuclear waste can be contained over extended periods of time by encapsulating the waste materials in containers composed of these alloys and burying the containers underground in an impervious, stable rock formation.

Abstract: A corrosion resistant synthetic iron-nickel alloy is prepared having the composition of the mineral awaruite. It is employed as a corrosion resistant coating on industrial metals. Articles of manufacture having high resistance to corrosion can be fabricated from the synthetic nickel-iron alloy per se or from industrial ferrous metals coated with said alloy.

Abstract: Disclosed are two improved container materials for radioactive nuclear waste. Radioactive nuclear waste can be contained over extended periods of time by encapsulating the waste materials in containers composed of these alloys and burying the containers underground in an impervious, stable rock formation.

Abstract: Disclosed are two improved container alloys for radioactive nuclear waste. Radioactive nuclear waste can be contained over extended periods of time by encapsulating the waste materials in containers composed of these alloys and burying the containers underground in an impervious, stable rock formation.

Abstract: An alkali metal-sulphur cell has an outer tubular casing and an inner tubular solid electrolyte dividing the cell into anode and cathode compartments and whose interior provides one of such compartments. The outer tubular casing and the tubular solid electrolyte are spaced apart to define an annular space, which provides the other compartment of the cell.A primary porous coating is provided on at least one surface of the solid electrolyte and an outer layer is provided on the primary porous coating, the outer layer being more dense than the primary porous coating.