Abstract: The invention proposes a changer device for optical elements (2a-2e) in stereomicroscopes with which a pair of optical elements (2) can be inserted in the two stereo channels (3) of a stereomicroscope. A particularly compact construction can be achieved by arranging the optical elements (2) side by side in an arc, more particularly in a circle, while between the elements of a pair of elements (2a, 2d) associated with the two stereo channels (3), at least one other optical element (2e; 2b, 2c) is provided, and in that the center (4) of the arcuate or circular arrangement (1) is shifted laterally away from the middle (5) of the stereobase of the stereo channels (3).

Abstract: A zero-clearance, axially displaceable aligning mount system for optical components includes an unthreaded mount receptacle having a transverse orifice and includes an aligning mount carrying lens elements or lens combinations. A cured plastic casting compound forms a thread substitute in the region of the transverse orifice and beyond it. Coating of this region with an antiadhesion agent, prior to application of the casting compound in pasty form, prevents the molded threads from sticking.

Abstract: A magnetically positioned precision holder for optical components in an optical device comprises a carrier for replaceably holding at least one optical component. The carrier is arranged in positionally adjustable fashion in a housing recess including a precision stop surface. Magnet pairs (A1/A2 and B1/B2) are oriented with identical polarity being provided in order to achieve a continuous contact pressure of the carrier (2; 3) against the stop surface (6), in such a way that the one magnet (A1, B1) is located in the recess and the corresponding magnet (A2, B2) is located in the carrier. The use of identically poled magnet pairs for movable precision holders and for precision positioning systems is also proposed.

Abstract: Stereomicroscope, particularly a mono-objective stereomicroscope, having an objective changer (2), particularly a revolving objective holder, accommodating at least two objectives (4, 6), wherein by actuating the objective changer (2) the optical axes (4a, 6a) of the objectives (4, 6) can be selectively moved, particularly rotated, into an operative position of the objective, wherein the objective changer (2) comprises a device (3) for rigidly fixing at least one objective (6) in a direction parallel to the optical axis (6a) thereof, and an adjustment device (12, 2a) for adjustably fixing and securing at least one other objective (4) in a direction parallel to its optical axis (4a).

Abstract: A zero-clearance, axially displaceable aligning mount system for optical components includes an unthreaded mount receptacle having a transverse orifice and includes an aligning mount carrying lens elements or lens combinations. A cured plastic casting compound forms a thread substitute in the region of the transverse orifice and beyond it. Coating of this region with an antiadhesion agent, prior to application of the casting compound in pasty form, prevents the molded threads from sticking.

Abstract: The invention relates to a novel type of microscope with an illuminating beam which is guided through the magnification power changer with optimized light intensity parallel to the observation beam. The invention specifically relates to a stereo fluorescence microscope comprising a set of quickly replaceable filters in interchangeable filter carriers. The novel design offers good light efficiency on the object. Malfunctions occurring as a result of intrinsic reflections or fluorescence phenomena inside the microscope are avoided.

Abstract: The cracking of hydrocarbon fractions, for example to obtain low olefins, in particular ethylene, is performed in reaction tubes that are at least partially coated with catalyst. The catalyst can promote gasification of coke with water vapor after the water-gas reaction in CO, CO2 and H2, and/or the cracking reactions. The catalyst coating can be placed directly on reaction tubes or on top of a previously applied adhesion promoter and/or auxiliary medium placed on the reaction tubes, in particular on a grid. Preferably, the catalyst coating is applied thermally, by cold-coating processes, in particular the slip process, by vapor deposition and/or,adhesion. The catalyst can promote, in particular, gasification of coke with water vapor after the water-gas reaction in CO, CO2 and H2 and make hydrogen, obtained during catalytic gasification, available for cracking hydrocarbons and/or as additional product.

Abstract: An apparatus for testing sheet material with sensors having one or more components and fastened to the front of a base plate as separate units on one and/or both sides of a sheet material path. The fastening system includes a first fastening device which is operable from the back of the base plate and permits removal of the sensor in the released state. In order to open a gap between at least one component of a sensor and the transport path, this component has second fastening device which is operable from the front of the base plate and permits only motion of the component relative to the transport system in the released state. Removal of the sensor is impossible in the released state of the second fastening means unless the first fastener device is released.

Abstract: The invention relates to a process for producing polyesters, especially high-molecular polyethylene terephthalate (PET) using titanium-containing catalyst-inhibitor combinations.

Abstract: The present invention provides a master batch composition based on elastomeric carriers, comprising an organic peroxide, a plasticizer and a filling material and optionally further additives compatible with the organic peroxide, wherein, in addition to the elastomeric carrier, it contains a polyoctenamer.The present invention also provides a process for the production of a master batch composition, wherein (a) the elastomeric carrier, the polyoctenamer, the plasticizer and optionally a part of the filling material or filling material mixture are homogeneously mixed and thereafter (b) the filling material or the filling material mixture or possibly the remaining amounts thereof, together with the organic peroxide, are incorporated at a temperature below the decomposition temperature of the peroxide.

Abstract: Process and catalyst for dehydrogenation or dehydrocyclization of hydrocarbons. The catalyst consists of an aluminum oxide/chromium oxide support with promotors consisting of compounds of alkali metals and/or alkaline earth metals and compounds of metals from the third and/or fourth subgroups of the periodic table. Coke formation and side reactions can be substantially suppressed by the use of these catalysts under special operating conditions and special reactors.

Abstract: An apparatus for removing cations/anions from liquids including a container provided with an anode mounted centrally in the container, a cathode surrounding the anode and a layer of ion exchange material mounted between the cathode and anode, the cathode and a wall of the container form an outer space filled with water therebetween, the anode and cathode form a water-free inner space therebetween, the inner and outer spaces are connected with each other at opposite ends in order to generate a liquid circulation.

Abstract: The invention relates to an apparatus for removing cations/anions from liquids, having a container material between a cathode and the layer of ion exchange material between the anode and the cathode and a free liquid-filled space as a treatment space between the layer of ion exchange material and the cathode and a liquid-filled outer space between the cathode and the wall of the container, the treatment space and the outer space being connected to one another at both ends in order to permit liquid circulation.

Abstract: The feeding apparatus comprises a flat housing mounted on the component insertion apparatus in vertical orientation. The housing includes a guiding channel for guiding the supporting tape of the belt containing the components to be fed. The guiding channel comprises a channel portion running horizontally along the upper narrow edge of the housing and has a freely exposed component pick-up area.Driving means are provided for stepwise forwarding the belt through the guiding channel, said driving means mounted in the interior of the housing and including a driving motor.The driving motor has a drive shaft running parallel to the two lateral surfaces of the housing. First and a second power transmission means are fixed to the drive shaft and adapted to stepwise forward the belt containing the components, and to forward the cover tape when it is peeled off from the belt.

Abstract: Oligomerization and isomerization of olefins, e.g., butene, is performed in the gas phase on a solid catalyst containing a superacid fluorine compound of an element of Group III, IV and/or V of the periodic table, e.g. Al.sub.2 O.sub.3 impregnated with a superacid or a salt thereof. e.g. HBF.sub.4, (NH.sub.4).sub.2 SiF.sub.6, H.sub.2 SiF.sub.6, NH.sub.4 BF.sub.4 or HPF.sub.6. The process is particularly applicable for increasing the olefin yield in steam cracking plants or for the recovery of fuel components from FCC residual gases.

Abstract: Low-molecular weight olefins from heavy hydrocarbons are obtained with a hydrogenating pretreatment and a subsequent thermal cracking of at least a portion of the hydrogenated product. In the first stage, the polyaromatic content of a first hydrocarbon fraction high in polyaromatic compounds, e.g., a vacuum gas oil, is selectively degraded with a zeolitic hydrotreating catalyst, and in a second stage the resultant hydrocarbons are refined with a non-zeolitic hydrotreating catalyst in admixture with a second heavy hydrocarbon fraction low in polyaromatic compounds, e.g., and atmospheric gas oil. This two-stage process permits the utilization of lower operating pressures as compared to the separate treatment of the heavy hydrocarbon fractions.

Abstract: Hot working roller reinforced with a working jacket of hard metal or the like, the jacket being prestressed in the direction of the roller axis by a clamping force acting via clamping rings presenting clamping surfaces inclined with respect to the roller axis, with the jacket being separated from the roller body by an annular gap having a height such that during use of the roller the outer surface of the roller body remains out of contact with the inner surface of the jacket over the entire intended operating temperature range of the roller.