Abstract: A method and an apparatus for the representation of video images or scenes, in particular aerial images with a relative movement between a pick-up sensor and the scene transmitted at reduced frame rate. Intermediate frames are reconstructed to be inserted between two transmitted frames, said reproduction starting from a small number of distinct corresponding reference points in the two transmitted frames, said reference points being situated in different vertical and horizontal coordinates within each of said two transmitted frames, and being determined by correlation of image point location within said transmitted frames calculating for each picture element in said intermediate frames the locations of the corresponding picture elements in each of said two transmitted frames and determining the value of the intensity for each picture element of said intermediate frame by interpolation and/or extrapolation and issuing said value.

Abstract: Laser beams are modulated by ultrasonic pulses transmitted through gaseous media as a means of determining flow field patterns and temperatures without disturbing the test media.

Abstract: A device is described which operates with pyrotechnic charges to release nts under load effected between a plurality of constructional components and including bolts acted on by transverse forces. An example of such a device is for the separation of the rotor blades of a helicopter in order to be able to eject the crew upwards from the helicopter by an escape system without danger on failure of the helicopter to fly. The bolts of the joint are connected to a housing having a cylindrical bore of which the axis lies substantially in the direction of the resultant of the forces necessary to release the joint by extracting the bolts. On one of the constructional components there is a piston which supports itself on said component and engages in a cylindrical bore of the housing. The pyrotechnic charge is situated in the space between the end of the piston and the base of the cylinder bore. An ignition device for the pyrotechnic charge is provided on the housing.

Abstract: An unstable laser resonator having two spherical mirrors for producing a collimated output beam with rotationally unsymmetrical magnification characterized by the inclusion between the two spherical mirrors of at least two other optical elements with cylindrical surfaces and wherein the cylindrical axes of said cylindrical surfaces are essentially perpendicular to each other. These other two optical elements may be mirrors or lenses.

Abstract: To avoid the necessity of piston rings in a piston-cylinder set, it is prsed that the cylinder liner be surrounded by a band consisting of a fiber composite whose thermal expansion in a radial direction is less than that of the cylinder liner, the impediment to expansion presented by the band varying over the length of the cylinder housing; that the piston be constructed with a cap consisting of a piston head facing the combustion chamber and an essentially cylindrical piston skirt adjacent to the cylinder bearing surface, and a force-transmitting core that contains the bearing for the piston pin and the spherical pressure pad; that a force-transmitting connection rotationally symmetrical to the piston's longitudinal axis be provided above the spherical pressure pad; that the cap be connected at the lower edge of the piston skirt to the force-transmitting core, but otherwise no contact be provided between cap and force-transmitting core except in the area of the force-transmitting connection; and that both cy

Abstract: In an absorption heat pump capable of bivalent operation, to make possible combined operation in addition to the pure heat pump operation and the pure boiler operation, it is proposed to divide the refrigerant stream after the condenser and the stream of weak solution leaving the boiler, with one component stream of the refrigerant being fed through the refrigerant throttle and the vaporizer to a low-pressure absorber, into which a component stream of the weak solution is introduced through the temperature changer and the solvent throttle, while the other component stream of the refrigerant is fed either directly to the boiler or to a high-pressure absorber, to which the other component stream of the weak solution is fed directly in both cases, and to feed the strong solution from the low-pressure absorber through the temperature changer and/or the reflux condenser to the boiler, but on the other hand to feed the solution from the high-pressure absorber directly to the boiler.

Abstract: A method is disclosed for increasing the cycle stability of a latent heat accumulator medium consisting essentially of a pure or saturated sodium sulfate salt melt. The cycle stability is increased by adding sulfuric acid to the latent heat accumulator medium in an amount of from 0.5 to 3%, by weight, based on the weight of the latent heat accumulator medium. The pH value of the latent heat accumulator medium is lowered without precipitation of impurities or the occurance of supercooling in the latent heat accumulator medium.

Abstract: An oil burner for installation in heating or steam-raising boilers. The ber has downstream of an oil atomization device a plate having a single opening or a plurality of openings arranged in a ring coaxially of the oil atomising device, the plate opening or openings being the only throughway for combustion air. A mixing tube is arranged coaxially at a distance downstream of the plate. The mixing tube has a diameter greater than the diameter of the single opening or of a circle which encloses the plurality of openings in the plate. A flame tube positioned coaxially around the mixing tube has a length such that the flow of combustion gases downstream of the mixing tube is applied against the internal wall of the flame tube. To enable the burner alternatively to be used for burning gaseous fuel at will, an annular chamber for the supply of a gaseous fuel and having gas outlet openings in the region of the plate opening or openings is also provided downstream of and close to the plate.

Abstract: An angular velocity sensor based on a ring laser, wherein at any given time beam components of oppositely directed wave trains can be decoupled, having photo-receivers for the decoupled beam components, and means for the generation of signals which correspond to intensity differences of the decoupled beam components. In accordance with the invention a photo-receiver is provided for each decoupled beam and detector means is provided to analyze the output signals from the photo-receivers both for amplitude and frequency. The detector means may consist of a subtractor, a pulse-former and a counter. A rotation-direction detector may also receive an output signal from the pulse-former and feed this as a plus or minus sign into the counter.

Abstract: Ultrasonic transducers, of an electrical capacitor formed of a counter-elrode and a synthetic material film lying thereon, held by a clamping ring and metallized on one side, are used amongst other things for running time measurements in flow field examinations in wind tunnels. It is in that case important to disturb the flow as little as possible by the spatial dimensions of the ultrasonic transducer and by the necessary mountings and current feeds. For the solution of the problem, it is proposed to fasten the counter-electrode (2) and the clamping ring (3) holding the synthetic material film (5) electrically insulated therefrom on a conductor plate (6) and electrically conductively to connect each with a respective conductor track portion (7, 8 or 7, 10, 8, 9).

Abstract: Disclosure is directed to an apparatus for producing a microwave discharge n a supersonic gas flow such that the available microwave energy is deposited in the gas as completely and uniformly as possible through a substantial cross-section of the flow channel. The flow channel is provided within a waveguide and microwave energy is caused to be propagated through the waveguide substantially in the direction of the gas flow. A supersonic nozzle is provided in the channel dividing the channel into an upstream plenum and a downstream low pressure region, and the electric discharge occurs in the low pressure region just beyond the nozzle throat.

Abstract: A latent heat accumulator is disclosed including an upright container hav, in a major volume first section, a latent heat storage medium, and a passage for a heat exchange medium extending through the charge in the first section. The passage is of the type of a conduit provided with intake openings at different levels. The flow of heat exchange medium through the conduit generates low pressure at the intake openings with the result that a part of the surrounding charge of the heat storage medium is drawn into the conduit for thorough intermixing and heat transfer. The intake openings are preferably protected to prevent large solidified particles of the heat storage medium from blocking the openings or from entering the conduit. The invention improves the heat transfer capacity and reduces the charge of the heat storage medium entering the associated heat exchange circulation system while retaining a relatively simple structure of the accumulator.

Abstract: To ensure that a body will be independent of gravitation for the performance of tests, an evacuable protection box is provided which encloses contact free the body from all sides.The protection box has contactless scanning units to monitor the position of the body in its inside. It is conducted along three axes by a guiding system firmly connected to the spacecraft.The movements along each of the three axes is accomplished by driving means controlled by the scanning units so that the protection box follows changed positions of the body relative to the spacecraft.

Abstract: An assembly as used to test material in a specimen within a high temperat range. The specimen or workpiece is clamped into a clamping mechanism having two clamping heads that are movably disposed with respect to each other. A divided workpiece end holder is disposed within an inwardly enlarged opening form on the facing front walls of each clamping head. A measuring apparatus including two elongation measurement holders are disposed at two laterally displaced locations along the length of the workpiece or specimen. A shoulder configuration is located at the laterally displaced locations on the workpiece. As the specimen is pulled apart by the clamping mechanisms located at each end thereof, the material between the shoulders is elongated. A particular rod and tube arrangement is used to measure the relative movement occurring between the elongation measurement holders disposed at the shoulder locations on the workpiece.

Abstract: Hydrogen evaporating in a liquid hydrogen tank is fed to a fuel cell generating electrical energy used to drive a cooling unit which cools the tank.

Abstract: An injection head introduces H.sub.2 and O.sub.2 into one end of an elongate combustion chamber. At the same time, water is injected into the chamber through peripheral ducts to form a water curtain, or through inlets in the injection head, or through apertures facing away from the injection head in water-cooled tubing extending in a plane perpendicular to the chamber axis.

Abstract: A latent heat accumulator is disclosed including a vessel for receiving a tent heat storage medium and a circuit for a heat exchanger medium. The heat exchanger medium is immiscible with the latent heat storage medium, has a different density than the heat storage medium and is openly conveyed through the heat storage medium. The vessel contains a collecting chamber for the heat exchanger medium and has a heat exchanger arranged therein. An external heat carrier medium flows through the heat exchanger for transfer of heat between the heat carrier medium and the heat exchange medium. The accumulator is characterized in that a first heat carrier medium for adding heat and a second heat carrier medium for withdrawing heat are conveyed in the heat exchanger in separate conduit systems which are in heat-conductive contact with each other and with the surrounding heat exchanger medium.

Abstract: A blue-flame oil burner including a flame-tube, a wall extending transvery of the flame-tube and defining the upstream end thereof, the wall having therein a metering orifice through which air enters the flame-tube, the orifice being the only air inlet into the flame-tube, an oil atomizing nozzle positioned upstream of the wall and discharging an oil spray through the orifice into the flame-tube, and a mixing tube positioned within the flame-tube co-axially of the orifice and having its upstream end spaced axially from the wall by a distance such that the peripheral area of the space between the wall and the upstream end of the mixing tube and defined within an imaginary upstream extension of the peripheral wall of the mixing tube to the transverse wall is between one and three times the difference between the cross-sectional area at the upstream end of the mixing tube and that at the orifice, the mixing tube having a length, L, and a diameter, D, such that the ratio L/D is between 1.0 and 1.

Abstract: The measuring equipment is used for the optical monitoring of cracks in mrial test pieces, which are loaded by a loading device. A television camera trained on the test piece is connected to a discriminator which converts the image points of the television image into binary pulses. The binary pulses of the television image are stored from time to time in a store. A comparator compares the contents of the store with the binary pulses of a consecutive television image and ascertains deviations between two consecutively-taken television images. The number of the non-coincident binary pulses of the compared television images is counted and indicated.

Abstract: An electro-hydraulic actuator is disclosed, particularly for use with control surfaces in aircraft. The actuator includes a regulating piston and cylinders and rapidly-operable switching valves for the positioning of the piston in the cylinder that are operated by the supplying of discrete volumes of operating fluid thereto. Switching pulses are applied to the valves by a computer, and a sensor that is responsive to each activation of the switching valves applies an answering pulse to the computer wherein a valve breakdown can immediately be recognized. The sensor may be responsive to changes in pressure and/or flow between the valves and the cylinder located at the valve body.