Abstract: Apparatus and method for the bending of rigid workpieces, particularly tubes, such as those of use in automotive exhaust systems, heat exchangers and aircraft hydraulic systems.

Abstract: In a method for the production of carbon black and hydrogen by means of pyrolysis of hydrocarbons with a plasma torch (3) in a reaction chamber the pressure in the reaction chamber (1), the feed rate for the hydrogen plasma gas and hydrocarbons and the angle of the injection nozzles (2) in the reaction chamber (1) are adjusted in order to establish a reaction zone (5) in the chamber's central area with a location which determines the reaction enthalpy for decomposition of the hydrocarbons into hydrogen and carbon black in order to obtain a desired quality for the carbon part. The enthalpy value is adjusted in a range between 1 and 50 kWh/Nm.sup.3 and the temperature in the reaction zone is maintained between 1000.degree. C. and 4000.degree. C.

Abstract: Provided is a combustion chamber for producing a pressurized gas containing: a wall structure defining an interior chamber; a first reflecting surface for reflecting a pressure wave within the interior chamber; a second reflecting surface for reflecting the pressure wave within the interior chamber, wherein the first and second reflecting surfaces are constructed and arranged to resonate the pressure wave in the interior chamber; at least one first inlet for introducing a first gas into the interior chamber; and at least one outlet from the interior chamber for drawing off a pressurized gas from the interior chamber. Also provided is a turbine engine containing the combustion chamber, and an electrical generating power plant containing the turbine engine.

Abstract: A sample removing tool comprises two partly spherical blades which are rotatably mounted on a carrier member about parallel axes. The cutting edges of the blades face each other and a portion of the cutting edges are arranged to lie in a nominal circle. The carrier member is rotatably mounted on a support member about an axis, the axis is perpendicular to a plane containing the nominal circle and passes through the center of the nominal circle. The axes of the blades are inclined to the axis of rotation of the carrier member. The blades are rotated about their axes and the carrier member is rotated about its axis such that the cutting edges of the blades move along the circumference of the nominal circle to cut a sample from a surface of a component arranged perpendicular to and intersecting the nominal circle.

Abstract: A method for determining the resonant frequency of vibration of a rotating blade comprises determining the approximate resonance frequency and rotating a blade at a plurality of frequencies in a range above and below the approximate frequency. At each frequency two measurements are taken representative of synchronous amplitudes at each measurement point (P.sub.1 and P.sub.2) wherein the two points are separated by an angle .beta. and there are an unknown number x of complete synchronous vibrations between the two points. A set of data is provided and a plot of P.sub.1 and P.sub.2 produced, the data being analysed to determine a likely value of x and hence the resonant frequency.

Abstract: Provided is a process for making pulp having the steps of:contacting an undigested cellulosic fiber material with a pretreatment liquid formulated from a mixture comprising alkali metal bicarbonate and alkali metal hydrogen sulfide as reaction components which are dissolved or disbursed in an aqueous liquid, under conditions that:(1) the reaction components react to form H.sub.2 S, CO.sup.2 and alkali metal carbonate in situ;(2) HS.sup.- ions are formed by disassociation of H.sub.2 S and/or by disassociation of alkali metal hydrogen sulfide; and(3) at least a portion of the H.sub.2 S and/or HS.sup.- ions is absorbed or diffused into the undigested cellulosicfiber material to enhance the sulfur content of the undigested cellulosic fiber material,to form a sulfur enhanced, undigested cellulosic fiber material, wherein the pretreatment liquid is substantially free of alkali metal hydroxide; anddigesting the sulfur enhanced, undigested cellulosic fiber material in a digester to form a pulp.

Abstract: A combustor for a gas turbine engine has a fuel nozzle located in the upstream end thereof and is positioned within a cylinder coaxial with said nozzle. The cylinder comprises at its downstream end an annular flange extending from the cylinder in a generally radial direction. The flange has a plurality of cooling air apertures radially extending therethrough so as to direct cooling air along the face of an adjacent heatshield.

Abstract: A frequency allocation plan for a wireless communication system that accommodates growth in demand from a low density reuse pattern of twelve cells to a high efficiency reuse pattern of three cells. The available radio spectrum is first divided into three ranges and each range is further divided into four groups. The frequencies in each range are sequentially assigned to the four groups, and the groups are further identified as even and/or odd index groups. The twelve cell groups are laid out in rectangular shapes of four cells across by three cells high, with a first set of three cells in the upper left portion being assigned to use a first even index frequency group. A second group of three cells in a lower left portion are assigned to use a second even index frequency group. A third and fourth group of three cells associated with upper right and lower right positions are assigned the first and second odd index frequency group.

Abstract: An electrical machine has a rotor shaft (12) which carries a plurality of rotor discs (14) for rotation therewith. Each rotor disc (14) has pairs of rotor rims (16) secured thereto. Each rotor rim (16) consists of a single row of alternate magnets (20) and laminated pole pieces (18) and is opposed by a series of stator cores (22) which straddle the rotor rim (16). Armature windings (24) are disposed within the stator cores (22) for operably exciting said stator. The phase relationship between the currents through the armature windings (24) and the orientation of the stator cores (22) or the magnets (20) in opposing rims (16) are such that the effects of electromagnetic coupling, long path fluxes and torque ripple is reduced.

Abstract: A flexible coupling and torque monitoring device includes a hub having two sets of flexible spokes extending radially outwardly from a common hub to respective separate rims; the rims are each provided with fingers attached at one end to one rim and with the opposite end extending over the other rim with the fingers of one rim interspersed with the fingers of the other rim; the rims are each attachable respectively to the end of a drive and driven shaft; a sensing member is located radially outwardly of the rims to detect deviations in the spacing between the fingers.

Abstract: A wireless system architecture whereby high efficiency broadband transceiver systems can be deployed at an initial build out stage of the system in a cost-efficient manner. A home base station location is identified within each cluster of cells and rather than deploy a complete suite of base station equipment at each of the cells in the cluster, inexpensive translator units are located in the outlying cells serviced by the home base station in which low traffic density is expected. The translators are connected to directional antennas arranged to point back to the home base station site. The translators are deployed in such a way which meshes with the eventually intended frequency reuse for the entire cluster of cells. The translator to base station radio links operate in-band, that is, within the frequencies assigned to the service provider.

Abstract: In this approach to implementing a wireless communication system, in band translator components are located in the center of remote cells which would normally contain a base transceiver system (BTS). Selective diversity processing is implemented in the translators by providing for at least two spatially separated receive antennas and two receive path circuits in the up link direction. A diversity circuit is time synchronized to the downlink signal to provide for proper detection and selection of the appropriate signal to be forwarded to a centralized BTS. As a result, a separate diversity path need not be maintained for the remainder of each backhaul link, and radio frequency components such as a second upconverter, synthesizer and power amplifier associated with the range extender can be eliminated.

Abstract: A heat exchanger has been developed with a helical insert (9) permanently mounted in a housing (2). Between the windings in the insert (9) there is formed a helical channel (20) for one heat exchange medium. The insert (9) is designed with a channel (10) for the second heat exchange medium. The heat exchanger is designed with a central tube (13) which is axially movable and rotatable. The central tube (13) is designed with scraper elements for removal of deposits in the channel (20). In one embodiment the scraper element is formed by a helical insert (15) of the same design as the insert (9). The insert (15) is designed with a channel (16) for the second heat exchange medium. In a further embodiment the central tube (13) is designed with one or more scraper arms (23) which may be liquid-cooled. Deposits are often formed on the heat transfer surfaces.

Abstract: A protective eyeglass assembly for use during sport activities comprises a pair of separate lens frames individually cooperating with a lens holder to secure a pair of lenses therebetween. A detachable nose bridge interconnects the pair of separate lens frames with the lens holder so as to form a unitary eyeglass assembly, easily dismountable for lens replacement due to lens damage or lens prescription.

Abstract: An abradable seal comprises a plurality of hollow aluminosilicate spheres in a matrix of aluminium phosphate. The matrix of aluminium phosphate also has an aluminosilicate filler. The hollow aluminosilicate spheres have a diameter in the range of 400 to 1800 microns, preferably a diameter in the range of 800 to 1400 microns. The weight proportion of hollow aluminosilicate spheres in the abradable seal is 30% to 50%. The density of the abradable seal is 1.5 grams per cubic centimeter. The hollow aluminosilicate spheres in the aluminium phosphate matrix have a relatively high temperature capability of approximately 1300.degree. C. maximum. This makes the abradable seal better able to withstand the environment in the turbine of a turbofan gas turbine engine.

Abstract: A hybrid access system and method using a hybrid access system point of presence router and a remote link adapter to connect a user computer terminal to a network for fast downstream information transfer by high speed information broadcasting with lower speed upstream information transfer through an independent upstream channel to the hybrid access system point of presence router. High speed downstream information transfer passes through a cable TV headend or a TV transmitter or a cell station.

Abstract: A technique for mobility signaling between a Base Transceiver System (BTS) and Mobile Switching Center (MSC) in a mobile telecommunications system. The MSC is interconnected to a number of BTSs using one or more primary rate links using a protocol such as Integrated Digital Services Network (ISDN), including a number of bearer (B) channels for voice transmission and at least one data (D) channel for control function transmission. Standard call processing messages are utilized on the ISDN D channel to support basic telephone functions such as call origination, call termination, and call release as much as possible. However, an additional logical communication link is established over each ISDN D channel to accommodate mobility related messaging which may include messages such as hand-off and registration messaging needed to support mobile communications.

Abstract: A reinforced front part of plastic, for use in the manufacture of cabins or bodies for vehicles in order to achieve rigidity, is molded or shaped as a box-shaped unit in one piece with an enclosure defined by at least five walls which serve as the front, bottom, bonnet, and side walls and with an open side to face the interior of the vehicle.