Abstract: Apparatus and methods of generating electricity using buoyancy principles, a buoyancy-driven power generation system comprising a closed-loop passage defined by a surrounding structure, the closed-loop passage arranged vertically to extend longitudinally along a closed-loop path, the passage configured to retain a liquid, a plurality of rotor-vessels slidingly arranged within the closed-loop passage and configured to translate along the closed-loop path within the closed-loop passage, each of the plurality of rotor-vessels including a fluid-retention cavity formed in a body of the rotor-vessel and having a density greater than a liquid in which the plurality of rotor-vessels will be submerged for power generation operations.

Abstract: Apparatus and methods of generating electricity using buoyancy principles, a buoyancy-driven power generation system comprising a closed-loop passage defined by a surrounding structure, the closed-loop passage arranged vertically to extend longitudinally along a closed-loop path, the passage configured to retain a liquid, a plurality of rotor-vessels slidingly arranged within the closed-loop passage and configured to translate along the closed-loop path within the closed-loop passage, each of the plurality of rotor-vessels including a fluid-retention cavity formed in a body of the rotor-vessel and having a density greater than a liquid in which the plurality of rotor-vessels will be submerged for power generation operations.

Abstract: A ceramic plate capable of luminescing under electron X-ray or other ionizing radiation comprises a fine powder bound in water glass such as sodium or potassium hydroxy silicates, or sodium or potassium borates. The powder is typically less than 50 .mu.m mean particle size e.g. 10 .mu.m size. Powder material includes: calcium borate, yttrium aluminate, zinc yttrium silicate, calcium silicate, germanate, Magnesium borate, Barium borate, strontium borate. Dopant materials may be Tb, Tm, Ce, Eu, Pr, Yb, Mn, Cu, Ag, Pb added in amounts up to 15% weight or more. The plate is formed by mixing powder and water glass into a dough. The dough is pressed in a mould to remove excess water glass and fired at about 950.degree. C. for about 8 hours. Alternatively excess water is used when mixing powder and water glass. This excess water is allowed to evaporate while the plate is in a mould prior to pressing and firing.

Abstract: A cathode ray tube (1) having a body (3) of glass material and a faceplate (5) of solid phosphor material. The body (3) and faceplate (5) are sealed together by a sealant (15) of malleable halide material--for example silver chloride, or lead-silver chloride eutectic. Sealing is effected by inserting a ring (15) of sealant material between abutting surfaces of the body (3) and the faceplate (5), heating in vacuum to above the melting point of the sealant, and cooling to allow the sealant to solidify. The faceplate (5) may be of single crystal material--e.g. zinc tungstate or calcium borate, or may be of hot pressed solid material--e.g. zinc yttrium silicate.