Abstract: A data processing unit monitoring device produces a first type of information and a second type of information in a data processing unit. A first troubleshooting device external to the data processing unit has a sequence network for producing a third type of information in response to receipt of the first type of information from the data processing unit a plurality of times. The third type of information is then transferred to a comparator for comparing the third type of information with other, predetermined information in response to receipt of the second type of information from the data processing unit, whereby to perform a test function. A process for monitoring a data processing unit thus produces a first type of information and a second type of information in a data processing unit for a test thereof.

Abstract: A method in signal processing of a train of pulses with a stable, high repetition frequency f.sub.r, in particular in connection with dispersion measurements of optical fibers, comprises sampling (1) of the received signal at a sampling frequency f.sub.s, wheref.sub.s =(f.sub.r .+-..DELTA.f)/n(n is an integer and .DELTA.f is several magnitudes smaller than f.sub.r). When the sampling frequency is generated by a pulse generator (3), which, through a phase-detecting circuit (4), depends on partly a reference signal (from the oscillator 6) and partly a low frequency signal derived (via 5) from the signal received and sampled at the frequency f.sub.s, a stable sampling frequency is obtained even though the signal/noise ratio on the input of the receiver is significantly smaller than was permissible in the past.

Abstract: Sink/float separation of finely divided mixtures of scrap plastics and non-plastics materials, such as metal and glass, by addition of a liquid halogenated hydrocarbon being substantially chemically inert towards the components of the mixture, having essentially no swelling or dissolving effect on the plastics components and having an intermediate density adapted to the densities of the plastics and non-plastics components, preferably a chlorofluoro-substituted aliphatic hydrocarbon, such as 1,1,2-trichloro-1,2,2-trifluoroethane, and then the resulting non-sedimented and sedimented fractions are separated and, if desired, subjected to further separation treatments, while the halogenated hydrocarbon is recycled.The process is non-destructive and particularly useful for separation of finely divided scrap wire, glass or cable, such as PVC/Cu, rubber/Cu, PEX/Al, PVC/Al, PE/Cu or mixtures thereof.

Abstract: In a screen consisting of a supporting frame (1) which is covered with apertured (6) screen elements (2) of resilient material, said screen elements (2) are well supported and particularly easy to replace without intervention, e.g. by way of welding, as they have longitudinal guide grooves (7) which have a profile serving to be snapped on to the upper layer (3) of the supporting frame (1) and such a depth that the lower layer (4) of the supporting frame (1) engages the underside of the screen elements (2). In a preferred embodiment the wires or bars in the lower layer (4) of the supporting frame are disposed so as to be out of alignment with the apertures (6) of the screen elements so that also the wires in this layer are protected against wear.

Abstract: A machine for forming heads on shanks, in particular nail heads, where the shanks are temporarily secured in a preferably rotary tool defining wholly or partially the shape of the heads and co-operating with a rotary roll. According to the invention at least one roll is adapted for internal rolling with respect to one or more of rings serving as tools, the shanks being located substantially radially in said rings.

Abstract: An optical element for incorporation into optical transmission means and comprising an optical fiber provided with a coating with a substantially circular cross section applied essentially coaxially closely around the fiber, to which coating is imparted such an adhesion to the optical fiber that a contraction tendency in the coating brought about in connection with the application of the coating affects the fiber with such an axial compressive force in its whole length that the force causes a real shortening of the fiber and a corresponding increase of the elongation at break of the fiber. The fiber can be provided with an intermediate protective layer, and an intermediate adhesive layer can be used. Optical transmission means comprising one or more optical elements in a sheath are described.

Abstract: An oblong cylindrical body such as an electrical or optical cable or a pipe having a concentric armour of spaced wires is provided with one or more binder tapes being provided with indentations such as corrugations or depressions in all or some of the spaces between the wires. The indentations may be produced by means of rollers having a surface in accordance with the desired indentations. The indentations may be produced before or after the application of the binder tape.

Abstract: A process and apparatus for continuously transforming a flat metal strip into an elongated pipe, in which the strip is fed through a forming tool along a curved forming path wherein the longitudinal edge portions are progressively turned up into cross-sectionally arcuate portions leaving between a substantially cross-sectionally rectilinear section, the width of which progressively decreases during travel of the strip through the forming tool. The curved forming path in the tool is such that it has a radius of curvature R(z) in its longitudinal direction, the arcuate portions each having a radius r.sub.o and the decreasing width of said rectilinear section being 2x(z) (wherein z is the distance of travel through the tool). The radius of curvature R(z) is controlled in sole dependence on r.sub.o and the differential quotient x'(z).

Abstract: An optical element for use in optical transmission comprising one or more optical fibers provided with an essentially tight-fitting coating and a strength member provided with an essentially tight-fitting coating of the same material, each of said coatings having an essentially circular cross-section, wherein the coating or coatings on the optical fibers are firmly connected with the coating on the strength member by connection means of the same material, and whose thickness is substantially smaller than the diameter of the coatings and where further the fiber or fibers are given a curve or wave shaped course. The connection means can be a continuous or locally broken fin and the coating can be applied commonly or separately around the fibers. Optical transmission means comprising such optical elements are described.

Abstract: The cross-linking of a moulded object based on polymeric materials is effected by heating the object in the presence of a liquid medium containing one or more peroxides under conditions that cause penetration, and the heating is continued at increasing temperatures to cause a homogeneous cross-linking.Employable peroxides are substantially stable under the first heating step but are cleaved into free radicals during the second heating step, at least the cross-linking step being carried out with the object enclosed in a liquid of approximately the same density as the polymeric material.

Abstract: A method in which to a brass containing 61-66% of copper there is added 0.02% of an alloying element such as arsenic, antimony or phosphorus and up to 4% of lead and in the case of chill casting and pressure die casting alloys 0.05-0.8% of aluminum, the remainder being zinc and usual impurities from the raw materials used, and in which the alloy after chill casting, pressure die-casting or sand casting, after extrusion or, where applicable, after hot pressing of parts cut from extruded rods, is heated to a temperature in the interval between 450 and 600.degree. Celcius for a period so selected that the .beta.-crystals are broken up, thus avoiding the occurence of a coherent structure of .beta.-crystals through the brass.