Abstract: An apparatus for separating isotopes of uranium, comprising a vacuum chamber and a source of uranium placed therein, means for evaporating uranium from the source, means for selectively ionizing a selected isotope from resultant uranium vapor, means for applying an electric and/or magnetic field within the chamber and a set of collector plates for collecting uranium ions and at least a collector plate for collecting un-ionized uranium, said ion-collecting plates consisting, at least at the collecting surface, of sintered yttrium oxide made electrically conductive by doping.

Abstract: Isotopes of an element are separated using a method in which a gaseous compound containing said element is brought into a condition in which the molecules of the compound are in the ground vibrational state, and the molecules containing the pre-determined isotope are selectively excited by means of a source of radiation. The selectively excited molecules are further excited, and/or directly dissociated, using at least a second source of radiation, including at least two laser beams which are converted using so-called "four-wave mixing" in a Raman cell. One of the laser beams is a high-energy beam that is a train of very short pulses.

Abstract: An electron accelerator of the microtron type, housing a vacuum chamber with two spaced apart, nearly parallel, flat pole pieces, between which a static, substantially homogeneous magnetic field is maintainable, a microwave resonating cavity interposed between the pole pieces, a source for supplying electrons and injecting them into the accelerator, said electrons moving in circular orbits in a plane parallel to the pole pieces under the influence of the homogeneous magnetic field and undergoing acceleration at each crossing of the microwave resonating cavity, as well as a device for withdrawing the electrons from the accelerator after they have been sufficiently accelerated, said source for injecting electrons ensuring source of electrons through one of the pole pieces, at an angle to the circular orbits of the electrons, and including a deflecting magnet interposed between the pole pieces for deflecting the injected beam into the plane of the circular orbits of the electrons.

Abstract: A biomedical centrifuge having a rotor in the form of a body having rotational symmetry wherein, from a surface area thereof, cavities are provided which accommodate substantially cylindrical vessels. The cavities--as viewed in a plane normal to the axis of rotation of the rotor--are located at the angular points of a regular polygon. There is also provided a motor for rotating the rotor at a speed of many tens of thousands r.p.m. The rotor body is made of a cap-shaped frame of synthetic plastics material and the cavities are provided in the plastics material. The remainder of the frame is substantially hollow. On its radially outer the periphery, the frame is surrounded by reinforcing rings or a reinforcing envelope made of substantially tangentially oriented long fibres of suitable material.

Abstract: A centrifuge in particular for medical use, comprising a vacuum chamber housing a centrifuge rotor, means for driving said rotor, at least one elongate vessel for substances to be separated, which vessel is pivotally suspended from the rotor in a pivot in such a manner that the central longitudinal axis of the vessel is directed substantially vertically when the rotor is at rest, but occupies a radial position at least at the operating speed of the rotor, in which latter position the vessel extends through an opening in an element formed integrally with, or attached to the rotor, in which position the vessel is retained in the radial outward direction by retaining means.

Abstract: A sublimation apparatus comprising an inner vessel placed within an outer vessel leaving an interspace between them. Inlets and outlets for a gas to be treated are connected to the inner vessel. Plurality of parallel-connected heat exchange channels are provided around the inner vessel, which heat exchange channels are connected to a bottom header and to a top header. A heat exchanger is placed in the top header. The apparatus further has a first reservoir for a first heat exchange medium. A closable connecting duct connects the bottom header and the first reservoir, and another connecting duct connects a vapor space of the first reservoir and the top header. A second reservoir for a second heat exchange medium different from the first heat exchange medium is connected by a closable connecting duct to the interspace between the inner and outer vessels. A closable connecting duct connects a vapor space of the second reservoir with the top portion of the interspace.

Abstract: A method of forming a ridge in a cylindrical tube member comprises placing the ends of the tube member into spaced-apart dies so that each die is a close fit around the respective end of the tube member, and the tube member has a free portion between the ends. Liquid is supplied to the interior of the tube member and the liquid pressure within the tube is increased so that its free portion bulges radially outwardly. While the radial bulge of the free portion of the tube member is continuously measured on the outside, the liquid pressure is gradually increased depending on the radial bulge measured until a pre-determined radial bulge is measured. Thereafter, while the liquid pressure is maintained in the tube member, the dies are axially moved towards each other until they are spaced a pre-determined axial distance apart. During this displacement the dies deform the bulge until the desired ridge form is reached.

Abstract: The invention relates to a high-vacuum molecular pump of the kind comprising at least two coaxial elements (1 and 2) mounted rotatably with respect to each other and at a small distance from each other, wherein a side of one of the elements (1) positioned opposite a side of another element (2) is provided with at least one helical groove (5), and wherein a pump space (6) is present between these two sides of the elements, which pump space (6) is in communication with a gas supply (7) and a gas discharge (10, 8). Between the gas supply (7) and the pump space (6) a substantially annular gas supply chamber (9) is present, which is bounded by the elements (1 and 2) and which is relatively wide near the gas supply (7) but narrows downstream towards the pumpspace (6). The helical groove (5) extends into the annular gas supply chamber (9).

Abstract: Gastight seal for a rotary shaft or a cylindrical resp. cylindrical like body, the seal being of the type using a molecular gas, which seal has properties that automatically will stabilize the rotor, if whirl phenomena exited by gasforces have temporarily given rise to a precessional movement.

Abstract: This invention deals with improvements in a seal for sealing flanges, covers and other objects, which seal consists of a combination of at least one metal annular packing and one elastic annular packing, one of them being situated concentrically about the other one, the metal packing serving mainly as a sealing member and the elastic packing serving as a backing ring.One of the flanges is provided with a stepped recess by which the position of the seal is fully defined and by which the seal is supported laterally. In case of providing the seal in the form of two mutually spaced concentric metal packings between which the elastic packing is fitted, the stepped recess in the flange possesses an appreciably lower upright edge.

Abstract: Centrifuge for the separation of gaseous mixtures with a rotor inside a housing, comprising a hollow, cylindrical or nearly cylindrical rotorpart also called a separating drum, in which drum a gaseous component may condense as a liquid. This liquid is admitted thereafter through openings in the drum to the space between drum and housing. In this space are formed a sequence of narrow openings, so called restrictors in which the liquid is brought to expansion, returning to gas form.These restrictors act also as bearings for the drum. The gaseous component that does not liquefy in the drum is drawn off.

Abstract: Nuclear reactor with a MHD driven gas-core vortex, that may be preceded by an enrichment section and followed by a reprocessing section, both sections based on gas-cores that are MHD driven gas-vortexes, in which the nuclear reactor functions with a mixture of e.g. UF.sub.6 and one or more light gases such as H.sub.2, DT, He.

Abstract: Apparatus wherein a partially ionized mass of gas is enclosed by a rotationally symmetric, axially elongate housing and set in rotation by a force which arises as a result of a substantially axial magnetic field constant in time and an electric current having a non-zero vector component in the radial direction, whereby positively charged ions originating from a centralized axial gas discharge arc region and moving at a high speed of rotation set the whole mass of gas in rotation by pulse transfer, said housing being lined on the inside with annular wall electrodes segmented in non-azimuthal direction and arranged against each other; the inside wall of said housing at an extremity thereof curving toward the center axis and approaching a centrally mounted electrode of opposite polarity, the wall electrodes being connected with variable resistors which are adjusted so that the voltage applied to the wall electrodes increases blockwise from a minimum value at a chosen point on the axis of the housing to the grid-

Abstract: A system for the continuous separation of a gaseous mixture or a mixture of gaseous isotopes by means of a number of cascade-connected separating units for enriching the mixture (called the rectifier) and a number of cascade-connected separating units for depleting the mixture (called the stripper), so designed that means are provided for transferring separating units temporarily from one stage of the cascade to another stage of the cascade.

Abstract: Apparatus for etching fine grooves in surfaces by the combination of pulsed currents in a modified Electro-Chemical Machining method in combination with a flow guiding template.The apparatus is very suitable for the etching of grooves in a surface used in a bearing.

Abstract: This invention relates to a device for welding cylindrical elements headwise to one another, whereby the welding is achieved by subjecting the cylindrical parts during the welding operation to a radial pressure near the welding area, which radial pressure may be directed inwardly or outwardly, whereas the device employed comprises an elastic ring to be arranged around the parts to be welded, said ring being accommodated in a sleeve in which a conduit for the supply of pressurized medium to the space between the ring and the sleeve is arranged.

Abstract: A conductor lead-through for elongated bodies, such as electric current conductors, which conductor lead-through is vacuum tight and contains no welded joints and is particularly suitable for use with difficultly weldable or non-weldable combinations of materials, said conductor lead-through comprising an assembly of parts including a cover, an intermediate ring engaging one end of the cover and a seal, such as an O-ring seal, the latter being fitted about said cover, said parts of said assembly being retained together and secured in an opening for that purpose by means of a clamp ring the periphery of which engages the wall of the opening.

Abstract: A system comprising a plurality of reactors each of which is connected by a plurality of pipelines to each of a plurality of manifolds, each pipeline having a central pipelength curved in a circular arc of about 270.degree. and connected at its ends to two substantially straight pipelengths which are arranged at a right angle with respect to each other, said reactors being arranged in at least one row, with said manifolds situated parallel to this row and above the reactors, in such a way that the distance between two successive manifolds is larger than the largest diametrical dimension of a curved central pipelength.

Abstract: A method for etching fine grooves in surfaces by the combination of pulsed currents in a modified E.C.M. (Electro Chemical Machining) method in combination with a flow guiding template.The method is very suitable for the etching of grooves in a surface used in a bearing.

Abstract: Holder for a welding head for carrying out welds on the innerside of a substantially closed body, said holder being in the form of an elongated member, the end portion of which is provided with a holding member for the welding head adapted to pivot from an axial position to a radial position, and wherein means are provided for controlling said holding member.