Abstract: An apparatus for comminuting concretions in bodies of living beings with a focusing chamber forming part of an ellipsoid of revolution wherein shock waves can be generated by spark discharge at one of the foci, the body being prone in a tub filled with a liquid, where(a) the focusing chamber is sealed by a high-strength membrane,(b) the focusing chamber is filled with an extensively degassed liquid,(c) the liquid is under increased pressure, and(d) the liquid is made to circulate, the liquid being evacuated at a location of the focusing chamber as high as possible, and a liquid free of gas bubbles being replenished into the focusing chamber.

Abstract: The test equipment for a synthetic aperture radar (SAR) system is provided with an input and output connector (6) and is composed of a signal loop (3) arranged between the input and output connector (6) and electromagnetically reproduces these pulses or signals (4) emitted from a SAR system (2) in the absence of a SAR antenna (18). The input connector (6) is electrically connected with a circulator (5) which is integrated into the signal loop (3) and which combines the incoming and outgoing pulses or signals (4) to and from the SAR system (2). The signal loop (3) is composed of a forward branch (7) and a backward branch (10), the forward branch (7) being composed of a multitap time-delay and reproducing different travel times of the pulses or signals (4), while the backward branch (10) in the form of a bus (9) combines the delayed pulses or signals (4).

Abstract: The invention concerns a procedure and a circuit arrangement for a coherent, high-resolution pulse radar applicable to distances from several tens of meters down to less than one meter and which evinces at the same time an accuracy in the cm range; the application is in particular to industrial monitoring operations.Two highly stable pulse sequences are generated in the transmitter and differ only slightly with respect to their pulse repetition frequencies. Both sequences are shaped into microwave pulse bundles and one sequence is processed into transmitter pulses, the other sequence being processed into scanning pulses for a time-expansion procedure. Heterodyning with the scanning pulses takes place in the receiver mixer, the result being a combined formation of intermediate-frequency (IF) and time-expansion. In this manner the signal bandwidth is already decreased by the time-expansion factor in the IF part. This is made possible in that coherent phases are used, i.e.

Abstract: This invention relates to an improvement in a collapsible antenna reflector with rigid, collapsible elements for high accuracy of contour, composed of a central panel and collapsible segments mounted thereto by means of joints, the improvement comprising means mounting the individual collapsible segments (5) so that in their collapsed state their contour curvature is equidirectional, with the individual collapsible segments being mounted perpendicularly to the central panel and being arranged from its periphery obliquely to the antenna axis.

Abstract: A high-temperature reaction solder, for silicon carbide materials, containing 20-45% cobalt and 80-55% silicon by weight, and a process for brazing are disclosed.

Abstract: A heterogenous powder comprising particles of tungsten grains with a diameter of less than 1 .mu.m with a binder sponge-like coating of at least one metal selected from the group consisting of nickel, copper, silver, iron, cobalt, molybdenum and rhenium with a particle diameter of 10 to 50 .mu.m, a process for the preparation thereof, method of forming sintered elements therefrom and the elements produced thereby being useful as penetrating projectiles.

Abstract: This invention relates to an improvement in a stepping motor composed of a stator housing containing annularly arranged electromagnets or coils with pole pieces and a magnetically conducting rotor composed of a flexible membrane solidly connected to an annular armature plate and connected to a drive shaft axially supported within the stator housing, the rotor being provided at its periphery with a toothed rim, the improvement comprising, in addition to the rotor (5), a second rotor (11) mounted on the drive shaft (3) and being composed of a flexible membrane (11') including a ring (9) provided with a toothed rim (10) conencted to the membrane (11'), the toothed rim (10) corresponding to a detent toothed rim (13) fixed to the stator housing (2), and the rotor (11) being so actuated by an electronically controlled indexing coil (15) located between the electromagnets or coils (4) that the rotor (11) is indexed or fixed in place according to the pitch of the detent toothed rim (13).

Abstract: This invention relates to an improvement in an apparatus for advancing or retracting a flexible pay-out connection in a controlled manner, for instance a pay-out cable fixed to a satellite body with a pay-out means mounted thereon, in particular for a spin-imparted satellite, the improvement comprising at least one groove means at the periphery of the satellite body to receive the pay-out connection, and at least one elastic holding means to hold the pay-out connection at the groove opening.

Abstract: This invention relates to equipment for rendering visible a specific metal charge of an ion exchanger comprising transparent viewing means, permeable container means behind said viewing means, and a mixture of chargeable resin particles and inert particles in said container means, said inert particles being lighter in weight than said resin particles when the latter are charged with metal ions. The invention also relates to a process for rendering visible a specific metal charge of an ion exchanger.

Abstract: This invention relates to a silver powder of Ag/CdO composition for use in electrical contacts comprising particles in the size range of about 1 to 10 microns and containing cadmium oxide in the form of a precipitate with a grain size less than about 0.5 micron.

Abstract: A sensor measuring the partial oxygen pressure in furnace exhaust gas has an active layer of palladium. When the sensor is maintained at a particular temperature, for example about 700.degree. C., the palladium changes to palladium oxide at a specific air number, namely 1.2. The change from palladium to palladium oxide and vice versa causes a change in conductivity by a factor of approximately 20. This change in conductivity is a clearly defined output signal which can be adjusted to occur at any desired air number in the region from 1.05-1.4, depending upon the temperature at which the sensor is maintained. Two sensors may be used, each maintained at a different temperature so that a control region is defined as the air number region wherein the sensor maintained at the lower temperature is oxidized while the second sensor is reduced. Preferably, the active layer consists not only of the metal oxide but also of a ceramic component such as cerium oxide which is doped with 0.5-10% by volume of Nb.sub.2 O.sub.

Abstract: A hard ferrite powder with the composition BaO.6Fe.sub.2 O.sub.3 composed of particles in the size range from about 1 to 10 microns and being easily separated into primary grains (monocrystal domains) which contain at least about 85% of primary grains with hexagonal lattice structures and sizes equal to or less than 0.5 micron.

Abstract: The mass flow rate of helium from a container is controlled by two disks having highly polished mating surfaces and mounted for rotation relative to one another. Each of the disks has at least one axial through passage, at least one of the disks having a through passage which is eccentric to the axis of rotation of the disk. Use of a plurality of through passages in one of the disks, one or more capillary grooves emanating from one of the through passages in one disk and terminating in the circular path described by the through passage in the other disk for controlling the flow rate is illustrated. For example a step motor in combination with a wobble plate rotates one disk in very exact steps relative to the other.

Abstract: At least part of the effluent from an ion exchanger flows past a first and second electrode. The electrodes are mounted within the pipe carrying the fluid so that they are visible from the outside. A DC voltage is applied between the electrodes. If the effluent contains a metal which should have been adsorbed by the ion exchanger, its presence is indicated either by a change in the voltage-current curve of the electrodes or a change in color of the cathode. Either a single metal or a group of metals may be precipitated.

Abstract: This invention relates to a material for the manufacture of porous electrodes for electrochemical high temperature cells and measuring sondes having oxygen ion-conducting solid electrolytes based on zirconium dioxide or cerium dioxide, comprising an admixture of mixed oxides having a perovskite structure based on LaMnO.sub.3 or LaNiO.sub.3 or LaCoO.sub.3, and small amounts of chromium and monovalent or bivalent cations selected from the group of the alkali elements or the alkaline earth elements or of Zn, Cd, Mg, Sn, or Pb. The invention also relates to a process for the manufacture of electrode material.

Abstract: This invention relates to an improvement in a circuit arrangement for defined current sharing, between parallel-connected switching regulator modules in DC switching regulators with continuous inductor current and common error amplifiers for the purpose of generating regulated DC voltage from an unregulated voltage source, the improvement comprising means in each switching regulator module, composed of an inductor, a semi-conductor switch, a free-wheeling diode and a pulse-width modulator, whereby for the purpose of controlling the pulse-width modulator a signal proportional to the time-varying inductor current of the individual switching regulator module is negatively fed back to the output signal of the error amplifier, and where the signal resulting therefrom is used to control the pulse-width of the corresponding switching regulator module.

Abstract: Fatigue in structural elements is determined by measuring the loss in specular reflection in a foil of polished metal secured to an exposed surface of the tested object, the elastic limit of the foil material under shearing stresses being lower than that of the tested object, and the foil consisting either of a single crystal or of polycrystalline material of uniform, small grain size.

Abstract: A solar collector panel consisting essentially of an electrically conductive substrate and of galvanically deposited projections which substantially completely cover a face of the substrate and extend away from the face to respective peaks absorb solar radiation efficiently when their peak-to-peak spacing averages 0.1 to 1 .mu.m in a direction parallel to the covered face, and the surfaces of the projections consist essentially of metal. The heat resistance of the projections can be enhanced by providing them with a core of different material, such as refractive metal oxide.

Abstract: Apparatus for supporting a body on a carrier in a desired angular position while the carrier is mounted on a moving base, such as a ship, includes an electrically operated drive for angularly moving the carrier relative to the base about a normally horizontally extending axis. The control device for controlling the drive includes a first signal generator which senses the rate of angular movement of the carrier in a plane perpendicular to the afore-mentioned axis and generates a first signal indicative of the sensed rate. A second signal generator includes a mercury switch and generates a second, constant, D.C. signal indicative of the absence or presence of a predetermined angular position of the mercury switch in plane perpendicular to the axis. A circuit connected to the signal generators and the drive transmits to the drive an electrical operating signal in response to the first and second signals and thereby causes the mercury switch to be moved by the drive into its predetermined angular position.

Abstract: This invention relates to an improvement in a spiral grooved bearing for a shaft adapted to travel in the direction of rotation, composed of a stationary bearing part with a hemispherically cup-shaped first sliding surface and a bearing part of the shaft having a spherical second sliding surface with spiral grooves in said second surface adapted to feed a lubricant between said sliding surfaces, the improvement comprising an additional bearing part centered at the hemispherically-shaped bearing part, said additional part having a sliding surface which encloses said second sliding surface up to the vicinity of said shaft, and sleeve means adapted to receive said stationary bearing part and said additional part.