Abstract: An upholstery fabric of enhanced stability is formed of knitted double jersey construction and has (i) a visible face side and (ii) a rear face side of principally bird's eye structure. The fabric has on its visible face side zones of a bird's eye structure, there being on the rear face side of the said zones a plain structure.

Abstract: A system which enables the user to visualize directly an object in 3-D Lobachevskian, 4-D Euclidean, or other geometries. The system includes an input device (10), a transducer (11), a processing device (11), and an output device (12). The transducer (11) determines incident angles of light rays from each object point with respect to the coordinate axes of the system eye, employing geometric relationships to the alternative geometry. Then, using those incident angles, it defines new rays which produce an image constituting a direct representation on the human retina of the original object in the space of the alternative geometry. The processing device (11) them assembles the image points and delivers them to an output device (12) to be viewed by the user.

Abstract: A pedicle hook for use in treatment of the spine has a bifurcated blade in which one of the legs formed by the bifurcation is longer than the other.

Abstract: A signal processor, which receives autocorrelation and cross-correlation coefficients of a system under study, provides predictor and filter coefficients of the system in an optimal manner, and allows the use of any number of available parallel processing units. The signal processor may be implemented in a fully parallel or fully sequential manner, or in a "parallel-partitioned" implementation.

Abstract: Apparatus for feeding flexible sheets singly from the top of a stack of sheets comprises a pick-up device which includes a gas deflector and gas supplying holes for directing a stream of gas at the topmost sheet on the stack to cause the sheet to separate from the stack. One of the gas supplying holes also directs a further gas stream at the gas deflector, with this further gas stream attaching itself to the gas deflector by the Coanda effect and entraining the topmost sheet into contact with the gas deflector.

Abstract: This implant for an osteosynthesis device, in particular for spinal column correction, contains a lower part (2) to be anchored to the bone and an upper part (3) to be adjustably fixed to a longitudinal bar (4). The upper part (3) contains a channel (6) running from front to back and open on the top, which positions the two side arms (7), threaded on the inside (10), to hold the longitudinal bar (4). In addition, there is a clamp (5) for the longitudinal bar (4), which is comprised of a cap (11) with a coaxial, outer rim (15) to surround the arms (7) and a coaxial inner cylinder (12) introduced between the arms (7); the outer surface of the inner cylinder (12) contains threads (13) which correspond to the inner threads (10) of the upper part (3).

Abstract: An endocardiac lead of the type including a conductive spiral winding 2 placed inside a sheath 1 made of a flexible material being insensitive to body fluids. This spiral winding 2 is electrically connected to an electrode 3 intended for being brought into contact with the inner wall of the heart. The electrode 3 is hollow and accommodates along its centerline a deformable helix 6 intended for fastening the lead into the heart muscle. The inner diameter of the electrode 3 is smaller than the outer diameter of the undeformed helix 6. The helix 6 presents a sufficient longitudinal elasticity modulus for being retractable inside the electrode 3 with a mechanical deformation, while the helix will substantially recover its initial shape during its extraction out of the electrode and secure the electrode to the tissue. The helix 6 may be made of a nickel-titanium based alloy.

Abstract: Trialkylsilyl nitrile is prepared by anhydrously reacting stoichiometric amounts of trialkylsilyl halide, hexaalkyldisilazane or trialkylsilyl amine, and hydrogen cyanide, in the absence or presence of a solvent or inert gas atmosphere. No catalyst is necessary, and the reaction preferably is performed at a temperature of from 5.degree. C. to 25.degree. C.

Abstract: In a thin film evaporator for the evaporation of solutions, colloids, suspensions, or the like, to concentrates, which has a heatable cylindrical evaporator casing coupled with a rotary drive, which evaporator casing has a feed inlet at one end, in the form of a feed distributor that runs on bearings and is coupled with a rotary drive, and at the other end has a concentrate discharge, the axis of the evaporator casing is arranged horizontally. The distal end of the feed distributor can reach the inside surface of the evaporator casing to within less than 2 cm. Wiper elements can work together with the effective surface of the evaporator casing. This thin film evaporator makes possible an optimal setting of the retention time of the process material to be treated in the evaporator casing and has the effect that the thickness of the layer of the process material changes very little over the entire axial length.

Abstract: An inflatable pressure vessel (1), which may be a decompression chamber for treating divers, has a flexible elongate casing (2) made of a silicone elastomer material reinforced with windings of reinforcing filaments and one or more removable end members (7,8) to provide access. An end member may be a rigid plate which seals against a frame (3,4) defining the entrance under internal vessel pressure. A transparent plastic plate gives illumination and allows inspection of a diver under treatment in a decompression chamber. Two pressure vessels (31,32) may be connected by a linking element (24) comprising a male part (25) which seals within a female part (33,34) under internal pressure and which has inter-engaging projections (29,35) and depressions (30,36) to prevent the parts from sliding apart axially under that pressure.

Abstract: A description is made of the preparation of new 2-piperazinylbenzimidazole erivatives, of general formula ##STR1## where R can be a hydrogen atom, a short chain alkyl group and a phenyl radical, substituted in position four by a halogen, and R.sub.1 can be a hydrogen atom, an alkoxycarbonyl radical, a hydroxymethyl group and a diphenylmethyl group, and their addition salts with pharmaceutically acceptable acids.These compounds are pharmacologically active as antagonists of the serotonin 5HT.sub.3 receptors.

Abstract: A two piece dispensing closure for a container having an internally threaded base with a dispensing orifice in the front section and an elevated rear land that has a pivot recess adapted to receive a separate lid that rotates at least 90.degree. from the closed position. The front section of the lid is generally circular with a pivot post at its rear, and when closed the upper surfaces of the lid and base are co-planar, and the closure has the appearance of a conventional screw cap.

Abstract: Controlling a cardiac pacemaker wherein the cardiac pacing rate is controlled according to a measure of the metabolic demand. The average minute ventilation MV-8-0 is measured over the eight last breathing cycles (first one to eighth one), and it is compared with the average minute ventilation MV-8-1 over the previous eight breathing cycles (ninth one to sixteenth one), and it is determined that an effort phase is present when MV-8-0>MV-8-1, and that a recovery phase is present when MV-8-0<MV-8-1. These determinations are used to determine whether sensed changes in the ventilation correspond to transitions between the effort and recovery or ventilation gaps or artifacts so that the cardiac pacing rate is not decreased during an effort.

Abstract: A high angle light scattering detector using classical Rayleigh scattering. A high intensity arc light source, filtered to leave only one wavelength illuminates a flow cell. Through the flow cell, very small particles such as biological proteins flow in solution after separation by HPLC or some other means. A UV detector generates data regarding the weight concentration of the eluting particles and a scattered light detector collecting scattered light at angles of approximately 90.degree. generates a scattered light signal. The incident light intensity is also measured. The average molecular weight is then computed using the scattered and incident light data, the weight concentration data and a simplified mathematical relationship from which the size factor P and the viral coefficients have been eliminated.

Abstract: An optimal parametric signal processor, which receives autocorrelation coefficients, provides lattice coefficients in an optimal manner, and allows the use of any number of available parallel processing units. The signal processor may be implemented in a fully parallel or fully sequential manner, or in a "parallel-partitioned" implementation which provides the benefits of parallel processing, manageable hardware complexity, and optimal signal processing for a given number of available processors. By using a "lattice basic cell" structure, hardware complexity is minimized.

Abstract: A robot end effector (10) for holding a fabric workpiece (64) against a working surface (74) has a rigid backing member (11), a facing strip material (13) arranged to contact the workpiece (64) around its periphery and a resilient intermediate layer (12) between the backing member (11) and the facing strip material (13), the width (w) of the facing strip material (13) being no greater than the thickness (t) of the intermediate layer (12).

Abstract: An upholstered three dimensional structure incorporating an internal core and a knitted fabric cover, in which there is provided in the cover a line along which the fabric is less extensible compared to the surrounding fabric, the line being positioned on the fabric such that the line curves over an edge of the core so that on stretching the fabric over the core the less extensible line is displaced from the general plane of the fabric towards the core.

Abstract: A signal processor, which receives autocorrelation coefficients, provides lattice coefficients in an optimal manner, and allows the use of any number of available parallel processing units. The signal processor may be implemented in a fully parallel or fully sequential manner, or in a "parallel-partitioned" implementation which provides the benefits of parallel processing, manageable hardware complexity, and optimal signal processing for a given number of available processors.