Abstract: An optical unit (10) comprising a plurality of optical elements, a receiving structure (12) with a plurality of element supports (40, 41) for receiving the optical elements. The element supports (40, 41) are in the form of a plate or shell or tube, whose dimensions are greater than the dimensions of the optical elements to be received, and is connected to another element support. At least one element support (40, 41) comprises temperature elements (43-49) that can be heated and/or cooled. The optical unit (10) furthermore comprises a control unit for driving the temperature elements (43-49) in order to locally change the temperature of the at least one element support (40, 41) so as to influence in a controlled manner the shape of the at least one element support (40, 41).

Abstract: An optical unit (10) comprising a plurality of optical elements, a receiving structure (12) with a plurality of element supports (40, 41) for receiving the optical elements. The element supports (40, 41) are in the form of a plate or shell or tube, whose dimensions are greater than the dimensions of the optical elements to be received, and is connected to another element support. At least one element support (40, 41) comprises temperature elements (43-49) that can be heated and/or cooled. The optical unit (10) furthermore comprises a control unit for driving the temperature elements (43-49) in order to locally change the temperature of the at least one element support (40, 41) so as to influence in a controlled manner the shape of the at least one element support (40, 41).

Abstract: Method for calibrating the deviation of a received beam in a terminal from its desired position. The received beam reaches a receiving sensor, and an acquisition beam an acquisition sensor of the terminal. The detection range of the acquisition sensor is greater than that of the receiving sensor. A portion of a transmitted beam emitted by the terminal to the partner terminal is guided as an incident beam on the reflecting surface, where it is reflected as an outgoing beam. A portion of the outgoing beam is respectively brought to the acquisition sensor and the receiving sensor. A respective measurement for the acquisition sensor and the receiving sensor is performed at least approximately isochronously; the measured results are compared for determining the deviation of the received beam from its desired position. Also a device for calibrating the deviation of a received beam in a terminal from its desired position.

Abstract: In the process according to the invention molding compounds based on duroplastic bonding agents are produced thereby that the bonding agents are mixed as a melt with the filler and additive substances. Curing is achieved thereby that the temperature of the mixture during the mixing process increases above the onset temperature of the curing reaction and, after the desired degree of curing has been attained, is suddenly lowered.

Abstract: An aqueous resol solution produced by an alkaline condensation of a phenolic compound with an aldehyde in a molar ratio of 1:1.5 to 2.5 with an alkali metal content of 1 to 5.0% by weight of the reaction solution, neutralizing the solution after the end of condensation at least partially with an aromatic hydroxy carboxylic acid at a temperature not greater than 50.degree. C. and then concentrating the reaction mixture which is readily dilutable with water.

Abstract: Mixtures consisting of a phenolic resin, a hardener, and residues from bisphenol-A production in the ratio of 1:9 to 9:1 are used for the production of binder mixtures for thermostable molding materials. Usable for said purpose are binders with a minimum content of phenolic resin of 10%.

Abstract: A granular molding material with a binder comprising a phenol novolac and a polyisocyanate which hardens upon addition of amine catalysts wherein the molar ratio of phenol to formaldehyde in the novolac is 1:0.25 to 1:0.5 and has the formula ##STR1## wherein R, R' and R" are individually selected from the group consisting of hydrogen, alkyl of 1 to 12 carbon atoms, hydroxy, cycloalkyl of 3 to 12 carbon atoms and an anellated ring and X is an integer from 0 to 4 or >4 with the percent molar distribution based on X is as follows:______________________________________ when X = 0: 20-55% X = 1: 15-30% X = 2: 10-30% X = 3: 0-50% X .gtoreq. 4: 0-2.5% ______________________________________for the production of improved foundry cores and molds.

Abstract: Improved high temperature resistant molding materials containing customary filler materials and additives and a carbon forming bonding agent which is a phenol novolac with a molar ratio of phenol to formaldehyde of 1 to 0.2 to 1 to 0.35 of high quality and free of solvents useful as refractory products, carbon materials, abrasive wheels, friction lining and the like.

Abstract: A non-woven textiles comprising a web of organic fibers bonded together by a binder applied to the fibers as a powdered mixture of a non-heat reactive phenolic resin and at least one thermoreactive condensation resin selected from the group consisting of phenolic resins, epoxy resins and amino resins and then fused and a method of producing said textiles.

Abstract: Binders are described based on acid curing phenol resins and acid curing agents which, after mixing, have an extended processability time but nevertheless exhibit a rapid curing time at relatively low temperatures. They are obtained by using, as the resin, aqueous phenol resols and, as the curing agent, either copper, aluminum, or iron(III) salts of aromatic sulfonic acids or addition products of hydroxy-containing, water-compatible polyols with aromatic sulfonic acids or mixtures of these salts and the polyol addition products. The binders are used for impregnation of fabrics, for production of abrasives and for fiber reinforced plastics.

Abstract: Hardenable molding masses are disclosed containing an organic binder material, fillers and additives wherein the binder material after the shaping and hardening is pyrolytically decomposed. The development of harmful substances such as aromatic hydrocarbons is considerably reduced through the addition of a boron containing compound.

Abstract: An arrangement for photographic data marking upon a film strip passing through a photographic camera, especially a high-speed theodolite camera, while utilizing a perforated mask and luminescent diodes carried by a substrate. In accordance with the invention, the arrangement is structured as an integrated component which contains at least the substrate, the semiconductor bodies of the luminescent diodes, the perforated mask and a transparent cover plate. The perforated mask is fixedly connected at the side confronting the film strip with the inner side or face of the cover plate. The semiconductor bodies which are electrically connected by electrical connections with one another and with the substrate are arranged at a slight spacing from the other side or face of the perforated mask.