Abstract: In a multiflow gas-dynamic pressure-wave machine, with a rotor, a housing surrounding the rotor as well as an air housing and a gas housing with ducts for the intake and discharge of the gaseous working substance, the cell ring of the rotor is subdivided by two intermediate pipes placed between a hub pipe and a shroud band into three concentric flows. The radially directed cell walls of the flows are mutually offset in the circumferential direction. The middle flow in the radial direction is dimensioned higher than the inner and outer flow. The cells of the three flows in the circumferential direction exhibit an uneven division.

Abstract: In a radial fan suitable in particular for traction vehicles, 10-15% of the conveyed air quantity is diverted radially from the cooling-air path by guide devices (10) which at the same time serve as a separator; the main proportion passes to the coolers after a 90.degree. deflection. In this way, dirt particles such as dust, snow, spray water, etc, are effectively kept away from the coolers.

Abstract: Process for applying a catalyst layer (4) composed of noble metals and/or noble-metal compounds to a ceramic support (1), in which a foil (2) made of an Ag/Ti alloy is first placed on the surface of the support (1) and this is fused in vacuo by heat treatment, cooled down again and firmly bound to the support (1). The catalyst layer (4) is in turn deposited in an electrochemical manner on the electrically conducting intermediate layer.

Abstract: A power semiconductor module and method for producing the module includes a plastic housing having a lower surface. An electrically insulating substrate having an upper surface is inserted in the lower surface of the plastic housing for supporting electrical components. A metallization is disposed at least on the upper surface of the substrate. The metallization on the upper surface of the substrate is patterned to form conductor tracks. Components are soldered onto the patterned metallization. Locating compartments disposed in the plastic housing form a soldering jig for the components during production of the module.

Abstract: In a steam condenser in which the steam is condensed on tubes which are grouped together in separate nests (2) and through which cooling water flows, the tubes, arranged in rows, of a nest enclosing a hollow space (13), a cooler (14) for the non-condensable gases in arranged in the hollow space. Two nests (2) are provided which are at a distance from one another and to which steam is admitted over their entire periphery, the nest form, irrespective of the external form of the condenser, being selected in such a way that first of all a convergent flow channel (15)--accelerating the steam--and then adjoining it a divergent retaining part (16)--deflecting the steam--are formed between the nests (2) on the one side and also between one nest each and the condenser wall. The cooler (14) for the non-condensable gases is located inside a nest in the plane in which, outside the nest, the convergent steam channel merges into the divergent part.

Abstract: A MOS transistor is formed in a silicon layer applied on an insulating base. The channel region of the transistor has a weakly doped region located nearest the surface of the layer and a more heavily doped region nearest the base. The latter region extends in under the source region of the transistor and is connected to the source contact of the transistor via a highly doped region of the same conduction type. The more heavily doped region is doped with a doping dose of at least 2.10.sup.12 cm.sup.-2.

Abstract: In an arrangement for measuring the energy of a microwave pulse a container (2) is placed on the end of a waveguide (1). In container (2) there is an absorption liquid (3) with a given heat content, which absorbs the energy of the irradiated microwave pulse. The increase of the heat content thus caused which corresponds to the energy of the microwave pulse is determined by the volume expansion of the absorption liquid (3). For this purpose container (2) is connected to a capillary (4). Preferably container (2) is covered with a reflection layer (12). Further, it is additionally connected to a balancing volume (5) and is cooled with a cooling coil (14).

Abstract: In the combustion chamber of a gas turbine, an air distribution chamber (19) and a combustion space (7) are locationally separated from one another within the combustion chamber shell (1). A multiplicity of tubular elements (2) are located between the distibution chamber and the combustion space, in which elements a premixing and pre-evaporation of the fuel oil supplied via the premixing nozzles (15') and/or a premixing of the fuel gas supplied through the premixing nozzles (15") takes place with compressor air. Each tubular element (2) is provided with a flameholder (3) in the direction towards the combustion space (7). A diffusion nozzle (8) for fuel directed into the combustion space (7) is located within the flameholder. In operation on load, only a small part of the fuel supplied to each element (2) is burned by means of the diffusion nozzle (8), the major proportion, on the other hand, being burnt by means of the premixing nozzles (15' of 15").

Abstract: An inductive heating unit for a magnetically permeable ladle containing molten steel has a cylindrical permeable wall for receiving the ladle and on which is wound an induction coil with an outer cylindrical permeable wall surrounding and enclosing the coil. The coil is wound from a conductor formed by a plurality of superposed flat metal strips which are insulated from each other. The outer wall is formed with a vertical channel in which a power lead for the coil is positioned.

Abstract: In a controllable power semiconductor component having a pnpn layer sequence of p-type emitter layer (9), n-type base layer (8), p-type base layer (7) and n-type emitter layer (5) the critical increased field rise during turn-off is reduced as a result of an intermediate layer (11), which has a higher n-doping than the n-type base layer (8) and which is inserted between the n-type base layer (8) and the p-type base layer (7).

Abstract: In a power semiconductor component with switch-off facility in which the switch-off capability is achieved by MCT unit cells, IGBT unit cells which are connected in parallel with the MCT unit cells are provided for switching on.This structure ensures an improved switch-on capability and an increased flexibility in designing the component.

Abstract: A surge arrester comprises a plurality of cylindrical arrester elements (11) of metal oxide varistor material which are arranged, with confronting end surfaces, between two end electrodes (13) in an elongated protective housing (10) which is resistant to deformation under the operating conditions for the surge arrester. The housing is of cross-linked HD polyethylene and is shrunk onto the envelope surfaces of the arrester elements and onto envelope surfaces on heat-absorbing metallic bodies (12) arranged between the arrester elements.

Abstract: In a high-power GTO thyristor with anode short-circuits (7) in the anode-side p-type emitter layer (6), the triggering sensitivity is improved by an additional thin and lightly doped p.sup.- -type barrier layer (9) between the anode short-circuits (7) and the n-type base layer (5) without the turn-off process being negatively affected.

Abstract: A radiation detector, serving as an infrared movement monitor, which is reactive to thermal radiation includes a housing having a window admitting the radiation and optics. The window having a size being coordinated with the angle of coverage of the optics disposed behind it. The optics focussing the radiation onto an optical sensor, preferably through a Fresnel lens. The window having a frame for accepting and guiding at least one masking element formed of a strip-shaped plastic film diminishing the infrared radiation and being slideably displaced in a guide channel along the window for covering the optics in a variable sub-region thereof.

Abstract: In order to enhance the efficiency of an ozone generator it is proposed that its outer electrodes (1,2) are formed essentially as metal plates arranged and separated from one another in pairs, between which a tube (3) or a layer of closely-spaced tubes (3) with a diameter corresponding to the separation of the metal plates lies. The tubes (3) have an outer coating of dielectric material, or themselves consist of such, and possess in each case an inner electrode (4) of an electrically conductive material.Despite a comparatively inhomogeneous discharge gap (6), such an ozone generator has a high efficiency of ozone generation because the heat arising in the discharge space can be dissipated optimally.

Abstract: A current limiter according to the invention has two resistors, the first one consisting of a thin layer of a material which may become superconducting and the second one is a resistance layer applied on first resistor, the latter resistor layer being dimensioned such that its resistance becomes considerably lower than the resistance of the superconducting layer when it is not superconducting, however with a resistance of such a magnitude that, in the current circuit in question, it limits the current to a permissible value. For mechanical support of the resistors, an insulator is included in the current limiter, and the superconducting material is applied on insulator. The resistors and the insulator are arranged immersed into a cryotank.

Abstract: Process water is formed when pyrolysis gas obtained in the pyrolytic decomposition of a starting material is cooled. Due to its content of chemical compounds, it is very costly to dispose of or eliminate the process water. A process for reducing the quantity of by-products in the generation of pyrolysis gas recycles the process water to a pyrolysis reactor operating with a fluidized bed. As a result, the process water is reduced in quantity and purified in a simple manner, and the yield of pyrolysis gas is increased.

Abstract: A method of making an object of superconductive material in the form of an oxide by isostatic pressing of a body preformed from a powder material with an oxygen-containing pressure medium at a temperature required for sintering of the preformed body, the powder material is an oxide of the metals contained in the superconductive material. Before the isostatic pressing is carried out, the preformed body is surrounded by a gas-tight casing with the ability to transport oxygen.

Abstract: A precipitation-hardenable nickel-base superalloy with improved mechanical properties in the temperature range from 600.degree. to 750.degree. C. which has the following composition:Cr=12-15 percent by weightCo=3-4.5 percent by weightW=1-3.5 percent by weightTa=4-5.5 percent by weightAl=3-4.3 percent by weightTi=4-5 percent by weightHf=0-2.5 percent by weightB=0-0.02 percent by weightZr=0.01-0.06 percent by weightC=0.05-0.

Abstract: A process for complete removal of nitrites and nitrates from an aqueous solution (1) by means of electrolysis, wherein the aqueous solution (1) is fed to the cathode space (4) of an electrolysis cell (2) and an aqueous solution (10), still containing only non-participating residual salts, is discharged from the anode space (6), whereas the gas (7) formed at the cathode is fed to a catalyst bed (8). In the latter, the gases H.sub.2, NH.sub.3, NO and N.sub.2 O collected in the cathode space (4) are converted to the non-toxic substances N.sub.2 and H.sub.2 O. In addition, partial combustion of H.sub.2 by O.sub.2 from the anode space (6) for maintaining the temperature of the catalyst bed (8).