Abstract:
Measurements of the squalene content in oil-in-water emulsions can be used as a way of checking for problems during production. In particular, it has been found that a drop in squalene content can indicate that filtration problems occurred. Testing the squalene content in the final lots is easier than investigating the characteristics of the filter, and so a squalene assay simplifies the quality control of oil-in-water emulsions.
Abstract:
A method and an apparatus for pressing elements in sheet form, in particular photovoltaic modules (3), are described. The method is carried out in a working space without a pressing membrane, using a pressing plate (1) provided with a peripheral inflatable seal (6). By creating a negative pressure in the working space (5), the pressing plate is pressed against the elements to be pressed, wherein the pressure in the inflatable seal is at the same time or previously reduced in order to carry out uniform isobaric surface-area pressing of the pressing plate against the element to be pressed. As a result, a low-cost method allowing a particularly uniform pressing process can be carried out.
Abstract:
The invention relates to a resonator assembly, comprising a conductive, semi-open outer housing, in the inside of which a conductive bar disposed coaxially to the housing is provided, wherein the bar at one end in the direction of the housing bottom has a ram and together with a dielectric and the housing bottom forms a capacitor and the bar is short-circuited to the housing at the other end such that the bar and housing together are able to form an LC oscillator circuit.
Abstract:
The invention relates to a method for producing alkyl-substituted butenols of the general formula (I): R -CH2-CH=CR -CH2OH, wherein R represents a saturated or olefinically unsaturated alkyl or cycloalkyl group with 4 to 16 carbon atoms that can be optionally substituted by an alkyl, cycloalkyl, aryl or alkaryl group with the proviso that said substituent has a maximum of 12 carbon atoms and R represents hydrogen or an alkyl group with 1 to 6 carbon atoms. The inventive butenols can be obtained in high yields and high purity by reacting the aldehydes of formula (II) R -CH2-CHO, wherein R has the same meaning as in formula (I), with the corresponding lower aldehydes and then reducing the unsaturated aldehydes obtained if (i) the aldol condensation is carried out in an inert organic solvent and (ii) the unsaturated aldehydes are reduced in the presence of optionally calcined copper-zinc. The reduction in step (ii) is carried out in a continuous and isothermal process and at temperatures ranging from 45 - 60 DEG C and at a hydrogen pressure in the range of from 1 to 300 bar.
Abstract:
The invention relates to a method for identifying a sample in a container, comprising the following steps: the container with the sample is disposed in the form of a resonator; a high-frequency signal is injected into the resonator for exciting a resonant mode of the resonator; the resonant electric field of the resonator penetrates a part of the sample in the container; the resonance curve of at least one resonant mode is measured with and without the sample; the sample is identified on the basis of the determined variation of resonance frequency compared to a measurement without sample. The invention also relates to an associated measuring device.
Abstract:
The invention relates to a multi-polar band pass filter based on a group of dielectric mode resonators which are placed in a metal housing and coupled to each other. The dual metal housing comprises metal walls. Said metal walls effect a coupling between the dual mode resonators in such a way that one positive forward coupling between the respective neighbouring pairs of resonators and a positive and a negative coupling within each pair of resonators arises.
Abstract:
The invention relates to oxidic zinc-aluminium catalysts for producing unsaturated fatty alcohols with 8 to 24 carbon atoms by hydrogenating unsaturated fatty acids, fatty acid low-alkyl esters or fatty acid glycerides. Said catalysts are obtained as follows: (a) an aqueous solution or dispersion of a zinc and aluminium salt is produced and the poorly soluble hydroxides are precipitated by the optional addition of a base, or (b) an aqueous solution or dispersion of a zinc salt is produced and the poorly soluble hydroxides are precipitated by the addition of an alkaline solution of an aluminium salt and optionally a base, or (c) an aqueous solution or dispersion of an aluminium salt is produced and the poorly soluble hydroxides are precipitated by the addition of an alkaline solution of a zinc salt and optionally a base. The precipitate which has formed is separated from the zinc aluminate, dried, optionally calcified and subsequently granulated and shaped into pieces, with the proviso that the zinc and aluminium salts are used in the molar ratio 5:1 to 1:5 in relation to the zinc and aluminium metals.
Abstract:
The invention relates to a method for hardening unsaturated fatty substances in the presence of transition metal catalysts. Said method is characterised in that the saturation of the double bonds is carried out at pressures of between 100 and 300 bar.
Abstract:
The invention relates to a multiple-chambered exhaust muffler (1), more particularly an exhaust muffler of a passenger car, comprising an outer housing (2) consisting of a top and a bottom half-shell (3, 4), an inner shell (5) and an inner exhaust line running through the exhaust muffler. According to the invention, the exhaust line is embodied with at least one first curved outlet pipe (9) having a first curved segment, the output end (27) of which is preferably rectilinear and extends in a flushed manner with the outer housing (2). The exhaust muffler (1) has an inner shell that is partly clamped in an offset peripheral fold (900) of the exhaust muffler (1).