Abstract: A waveguide junction for joining together two pairs of rectangular waveguide arms, each pair being connected to present a corner connection, to form a directional coupler in which the four arms are arranged to define a cross, the junction being composed of an element constituting a partially radiation-permeable obstacle oriented diagonally to all of the waveguide arms and two waveguide sections each disposed between a respective side of the obstacle and a respective pair of waveguide arms and dimensioned so as to match the impedance at the surfaces of the obstacle to the values required at the corner connections in a manner to permit the coupler to operate in a frequency range which permits propagation of the desired waveguide mode while spurious modes excited in the coupler are evanescent.

Abstract: Contaminated wash water in nuclear plants are processed by mixing the wash waters with ion exchange resins to form a suspension and then feeding the resulting suspension to a filter.

Abstract: A circuit for a digital/analog converter comprising a shift register whose contents correspond to a value of an electrical magnitude, a control logic unit for controlling the shift register and an integration element for integrating the contents of the shift register to produce the value of the electrical magnitude.

Abstract: A system for re-establishing the orthogonality of two orthogonally polarized transmitted signals which are each provided with a beacon signal of a different frequency and which are cross-coupled when received. The received signals are fed to a decoupling network, including two controllable members for adjusting the orthogonality of the received signals, which separates the two received signals.

Abstract: A system for simultaneously extending two storable tubular extendible members, each such member being composed of two elongate strips of elastically deformable material, each strip having been fabricated to normally assume the form of a tube having an axis parallel to the length of the strip and being capable of being coiled about an axis perpendicular to such tube axis and of being flattened in the direction of its width while retaining its ability to assume the form of a tube upon being uncoiled, there being provided two coiling drums each arranged to carry one respective component strip of each tubular member and the drums being arranged to be rotated simultaneously in order to uncoil the strips in a manner to extend the two tubular members, or to coil the strips in a manner to retract the tubular members. The system can be arranged to provide any number of pairs of tubular members by providing a plurality of axially spaced pairs of coiling drums each carrying two such strips.

Abstract: An electrode centering and clamping device for producing diffused, contacted and surface passivated semiconductor chips for semiconductor devices, wherein after producing a semiconductor wafer with a given arrangement of layers and regions of different conductance and different conductivity types for a plurality of devices by doping with impurity forming elements, both of the major surfaces of the semiconductor wafer are provided with respective metal layers and output electrodes are applied to both of the metal layers for the plurality of devices with the output electrodes being of such a thickness and overlying such areas of the metal layers so that the thickness of the electrodes will still be sufficient for further processing after a subsequent separation of the wafer into the plurality of chips and the major surfaces of the chips after separation, are completely covered by the output electrodes.

Abstract: An improved antenna system of the type including a parabolic antenna with offset exciting in which only the upper portion of the parabola is used, an approximately horizontal bottom plate, and an exciter which is disposed above the bottom plate. The exciter has a tilt angle of about 50.degree.. The paraboloidal reflector is covered by a dielectric cover plate which is inclined to the vertical so that the cover plate and parabola contact in a single plane, and a portion of both sides of the width of the parabola is removed, and side sheets are provided to connect the paraboloidal bowl and the cover plate. The exciter is a conical multimode exciter with an aperture angle of about 100.degree. and is provided with at least one and preferably a plurality of concentrically arranged slits on the conical surface of the exciter facing the paraboloidal reflector with the depth of the slits decreasing in a direction toward the edge of the cone adjacent the reflector. The width of the slits is between .lambda./10 and .

Abstract: In the fabrication of an electrophotographic recording material of the type composed of selenium, selenium compounds, or alloys with selenium, the method is simplified by initially vapor-depositing the photoconductive recording material onto a carrier at a temperature below the glass transformation temperature, and then heating the recording material to a higher second temperature range between the glass transformation temperature and a temperature just below that at which the electrophotographic properties of the recording material begin to change.

Abstract: A semiconductor arrangement comprises a region of a second type of conductivity formed in a semiconductor body of a first type of conductivity from one surface thereof, an insulating layer on this surface defining an opening above the said region and a resistance layer covering the opening in the insulating layer and comprising a metal silicide compound of silicon with a metal from the subgroups of groups V or VI of the periodic system which contain tungsten, molybdenum or tantalum.

Abstract: A terrestrial solar cell generator including a plurality of solar cells mounted in a housing and interconnected by a plurality of leads with the solar cells being protected against adverse environmental conditions. The housing is entirely formed of the same radiation resistant material and encloses the solar cells and the connecting leads on all sides.

Abstract: In the fabrication of an electrophotographic recording material composed of a photoconductive layer of selenium, at least one selenium alloy, or at least one selenium compound applied to a conductive substrate, the quality and durability of the bond between the layer and the substrate is improved by initially vapor-depositing a thin layer of the photoconductive substance while the substrate temperature is above the glass transformation temperature of the substance, and then vapor-depositing the remainder of the intended layer at a substantially lower substrate temperature.

Abstract: In a marine power plant which has an rpm-regulatable heavy gas turbine, a propulsion generator driven by the turbine, a propulsion motor driven by the generator and a fixed propeller driven by the motor, the turbine rpm is regulated as a function of the propeller rpm to obtain a delivered turbine output which lies above the minimum output limit of the turbine.

Abstract: A semiconductor arrangement comprises a semiconductor body with a metal layer thereon whose exterior surface is vapor deposited or sputtered gold, a layer of palladium on the metal layer and a connecting region of electrolytically deposited gold on the palladium layer.

Abstract: An ignition system having capacitive storage of energy required for developing ignition pulses, particularly in Otto and Wankel engines, includes a capacitive storage arrangement, a charging circuit connected between the capacitive storage arrangement and a direct current supply for charging the capacitive storage arrangement, and an ignition transformer coupled to the capacitive storage arrangement via a thyristor switching arrangement for temporarily discharging the capacitive storage arrangement through the ignition transformer to develop pulses therein for application to spark plugs or the like.

Abstract: In a circuit for compensating time errors in a television signal and including an electronically controllable delay line in the path of the signal and control signal producing elements in a control signal path connected to the line to vary the delay from a basic value of .upsilon..sub.O by .+-..DELTA..UPSILON., the delay time of the control signal path is given a value which has a selected relation to .upsilon..sub.O.

Abstract: A data transmission system for the transmission of time multiplex data between a plurality of stations via the transponder of a communications satellite wherein each pulse frame includes a code sequence (SRUW) periodically transmitted by a reference station and which can be used for synchronization by the other stations, and pulse bundles transmitted by a pedetermined sequence by the other station. A plurality of the stations are utilizable as reference stations but only one is active. Each of the stations which can be used as a reference station periodically transmits its own code sequence at the beginning of successive pulse frames, with the reference stations being synchronized with the coded sequence from the active reference station and the other stations being synchronized with the coded sequence of any of the reference stations.

Abstract: A circuit arrangement for evaluating received oscillations whose maximum possible time duration is predetermined, by determining the time duration of the oscillations. Pulses of a constant frequency are fed to a counter during the time the oscillations are being received and a count representative of the number of counted pulses is stored in a memory as information. Whenever the counter state representing the maximum possible time duration has been exceeded, indicating that the received oscillations are interfering oscillations or noise, the feeding of pulses to the counter is interrupted and the stored information is erased.

Abstract: A method of doping a semiconductor body comprises applying to a surface of the semiconductor body a layer through which the doping material can diffuse and provide the layer with a reducing agent to reduce the doping material to its elemental form at areas where doping is not required.

Abstract: An acoustic surface wave filter comprises a member stimulable to surface oscillations with means for converting electrical energy into mechanical energy and vice versa associated therewith and a plurality of disturbance locations on a surface of the member in the form of a line grating with variable spacing between adjacent lines in the longitudinal direction of the lines.

Abstract: A hammer drill has a housing, a tool shaft rotatably and axially displaceably supported in the housing, a motor, a gearing connecting the motor with the tool shaft and a striking mechanism for imparting successive impacts to the tool shaft. The striking mechanism includes an axially movable striking element. The hammer drill further has a clutch component mounted on the tool shaft and having an engaged state in which it is operatively connected to the striking element and a disengaged state in which it is disconnected from the striking element, and a drive element connecting the motor with the clutch component to rotate the latter. The drive element and the clutch component are arranged axially slidably relative to one another. The striking mechanism further has an intermediate member supported next to and in axial alignment with the clutch component.