Abstract: Two sensors are carried on board a spacecraft: a first, low resolution "preview" sensor, and a second high resolution "fine sensor", the latter having sensing parameters which can be adjusted to satisfy the needs of a particular customer. The instantaneous field of view of the preview sensor is located at a fixed distance ahead of that of the fine sensor, so that within a predetermined time period, users may decide which partial data are to be transmitted by the fine sensor and under which observation parameters (such as spacial resolution, spectral channels, measuring site, size of the measured area) to their earth station in near real time, still within the course of the actual overflight. Compilation of the specific data requested by the customers takes place on-board the spacecraft upon telecommands by the customers themselves. Sensing of the data requested by the customer is then performed by the fine sensor.

Abstract: The invention relates to a method and to an apparatus for continuously removing metabolically produced carbon dioxide from respired air, such as the air found in life support systems or cabin circulating systems, using two sets of hollow fibers disposed in a flowing, carbon dioxide-selective liquid membrane. The carbon dioxide-containing respired air flows through the first set of hollow fibers and the second set of hollow fibers serves to carry away the permeate stream.

Abstract: The invention relates to a process for determining the deviation of the intermediate frequency from a given reference frequency (f.sub.R) in the case of a frequency-pulse radar system, characterized bythe time-related scanning of the echo signal such that, from an echo pulse of an individual target, several scanning values are obtained at different, preferably equidistant points in time within the echo pulse,the Doppler filtering by way of the thus obtained scanning values of an individual target so that several Doppler signals of the same frequency are obtained from the same target from whose phase differences the intermediate-frequency deviation is determined.

Abstract: Device for recording flight data in a data recorder located in a spherical metal housing with thermal insulation on the interior surface and with connecting lines between the data recorder and data sources.

Abstract: A method and apparatus for carrying out an electrolytic process produces clean gases, such as oxygen and hydrogen. For this purpose, a porous diaphragm is arranged between the cathode and the anode of an electrolyzer, and a liquid electrolyte is fixed in the pores of the cathode and anode. A first gas chamber adjoins the cathode, while a second gas chamber adjoins the anode, and an educt chamber is separated from the first gas chamber by a membrane. An aqueous, non-corrosive solution of salts of inorganic and organic acids or mixtures of water with organic additives is used as an educt, which, compared with the electrolyte, has a higher partial water vapor pressure.

Abstract: An electrolyzer has an educt chamber, a membrane, a cathode-side product chamber, a porous cathode, a diaphragm, a porous anode, in which case a liquid electrolyte can be fixed in the pores of the anode and the cathode, and an anode-side product chamber. Between the membrane and the cathode-side product chamber, a first electrically conductive plate and, adjacent to the anode-side product gas chamber, a second electrically conductive plate, are situated. The two conductive plates are used for the current supply to and the current removal from the electrodes.

Abstract: The invention provides an IR modulator for synchronized interruption of an IR beam path in a thermal imaging device. A layer made of thermorefractive material is arranged in the beam path, and means are provided for changing the temperature of the thermorefractive layer.

Abstract: The invention relates to a method for continuously removing nitrogen oxides in exhaust gases of internal combustion engines containing an excess of oxygen by feeding a reactive nitrogen-containing plasma jet into the exhaust gas stream, wherein the plasma jet is generated by electromagnetic high-frequency fields.

Abstract: The invention relates to a joint for folding and unfolding a cantilever arm on a satellite. Pivoting of the cantilever arm during unfolding is governed by a guide element which is rigidly connected with the end of the cantilever arm and is held against stop plates which are rigidly attached to the satellite, by means of at least one coil tension spring connected with cantilever arm and with satellite itself. Each of the stop plates has first, second, and third unfolded stops which cooperate with the guide element. The first and second unfolded stops are mounted symmetrically with respect to the motion plane of cantilever arm. During unfolding of the cantilever arm, the guide element strikes alternately the first two unfolded stops on the one hand and the third unfolded stop on the other hand; and with cantilever arm in the unfolded state it abuts all three unfolded stops. Two additional stops rigidly connected with satellite are provided for guide element, on which cantilever arm rests in the folded state.

Abstract: An acoustic absorber is made of a pot-shaped lower part with a pot bottom and side wall as well as an upper part having a horn. The horn projects into the bottom part and tapers in the direction of the pot bottom. Undesired noise is effectively reduced by the absorber. A relatively broadband, and at a given size, a relatively low-frequency absorption effect is achieved that is capable of protecting human hearing from injury or reducing the impact of noise such as on technical equipment and components.

Abstract: This invention relates to a high-strength ceramic fiber composite with a high temperature stability and an improved oxidation stability and to a process for producing it.

Abstract: A pane made of glass or plastic, whose optical degree of reflection can be controlled by switching between two different interference conditions. As a result, the transmissibility with respect to sun radiation can be reduced very efficiently and an excessive heating of glazed objects can be prevented. Preferred applications of the invention are the climate control of motor vehicles, rail vehicles, airplanes and buildings.

Abstract: The present invention relates to a self-supporting joining element for planar high-temperature fuel cells for high-temperature electrolysis cells comprising the materialLa.sub.1+.delta. Mg.sub.x Al.sub.y Cr.sub.1-x-y O.sub.3.+-..epsilon.wherein 0.ltoreq..delta..ltoreq.0.1;0.02.ltoreq.x.ltoreq.0.0;0.1.ltoreq.y.ltoreq.0.25; and0.ltoreq..epsilon..ltoreq.0.1.

Abstract: A microelectronic thin-film device having a thin superconducting layer in contact with a thin quasi-insulating conversion layer. The critical current of the superconducting layer is controlled by application of a voltage to the conversion layer by means of a gate electrode, causing the conversion layer to undergo an insulator-metal transition.

Abstract: A process for detecting metallic or other electrically conducting objects in essentially flat search areas by means of at least one search probe which generates search signals is presented. The probe is guided relative to the search area parallel to its surface, along a search path situated in a search surface. By at least one analysis unit coupled with the search probe, the search signals are automatically correlated with the positions of the search probe on the search surface, as determined by localizing devices. The correlated data are converted to an image of the objects in the search area, such as an object map.

Abstract: The invention provides a fuel cell arrangement with a plurality of fuel cell stacks which are stacked on top of one another and are enclosed in a sealed exterior housing. Supply air is freely guided to the fuel cell stacks within the enclosure, while combustion gas is provided to the respective stacks by means of pipes. A plurality of flat seals are provided between adjacent fuel cell stacks, each having a central air opening and a separate peripheral combustion gas channel. The lowermost fuel stack is mounted by means of such a seal, on a base plate into which a collective channel for exhaust air and a channel for combustion gas are integrated.

Abstract: By means of this acoustic protection it is possible to protect the payloads of expandable launch vehicles effectively against noise emissions from the rocket propulsion system which result in damage of the payloads. For this purpose acoustic absorbers (8) tuned to a defined frequency range are provided and are arranged in foamed plastic mats (7) disposed on the insides (6) of the payload fairing (1). The acoustic absorbers (8) are composed of a cup-shaped lower part (12) and an upper part (13) having a horn (18). The horn (8) tapers in a curved-conical manner from a larger diameter (D.sub.m) to a smaller diameter (D.sub.t) and projects into the lower part (12) by a defined distance (a) from a bottom (14) thereof. Slits (21) for the dissipation of the directed flow energy occurring in the horn (18) are disposed in the wall of the horn in the area of the smaller diameter (D.sub.t).

Abstract: A method and a device for NO reduction of exhaust in motor vehicles by reduction on a catalyst is provided. The hydrogen required for NO reduction is generated directly on board the motor vehicle by electrolysis with liquid fixed electrolyte.

Abstract: A layer system with a controllable heat emission, includes an IR-transparent carrier substrate, a layer with a controllable IR-transmission, an ion-permeable, IR-reflecting electrode, a solid electrolyte, an ion storage layer, a back electrode. The ion-permeable, IR-reflecting electrode is structured in such a manner that it is provided with non-cohesive openings which are distributed homogeneously over the electrode surface and whose maximal flat dimension is smaller than 10 .mu.m.

Abstract: A process for the production of sandwich structures made of fiber-reinforced ceramics, the base substance of the ceramic matrix consisting of a Si-organic polymer and a ceramic or metallic powder. A cross-linking of the Si-organic polymer takes place under increased pressure and at an increased temperature. After the joining of the facings and the honeycomb core, the sandwich structure is pyrolysed to form a ceramic material.