Abstract: A method is provided for removing traces of heavy metals from concentrated alkali metal chloride solutions down into the range of 0.01 ppm by coprecipitation from an acidic concentrated alkali metal chloride solution with iron oxide hydrate.

Abstract: There are provided 13-alkyl-11beta-phenyl-gonanes of formula I ##STR1## wherein Z is an oxygen atom or N--OH;R.sup.2 is alpha- or beta-position methyl or ethyl;R.sup.1 is selected from heteroaryl radicals, cycloalkyl radicals, cycloalkenyl radicals, aryl radicals, alkenyl radicals, and alkyl radicals where R.sup.2 is in the alpha-position and an ethyl radical where R.sup.2 is in the beta-position; andR.sup.3 and R.sup.4 are selected from one of two different groups of substituent pairs, the group from which the selection is made being determined by the position of R.sup.2.

Abstract: There are provided 13-alkyl-11beta-phenyl-gonanes of formula I ##STR1## wherein Z is an oxygen atom or N--OH;R.sup.2 is alpha- or beta-position methyl or ethyl;R.sup.1 is selected from heteroaryl radicals, cycloalkyl radicals, cycloalkenyl radicals, aryl radicals, alkenyl radicals, and alkyl radicals where R.sup.2 is in the alpha-position and an ethyl radical where R.sup.2 is in the beta-position; andR.sup.3 and R.sup.4 are selected from one of two different groups of substituent pairs, the group from which the selection is made being determined by the position of R.sup.2.

Abstract: New 11.beta.-phenyl-14.beta.H-steroids of general formula (I), where Z is an oxygen atom or the hydroxyimino-grouping N.about.OH, and M and N are either jointly a second compound or L is a hydrogen atom and M is an .alpha.-permanent hydroxy group and either A and B together are a second compound and D is a hydrogen atom, where R.sup.1 is a five or six-part heteroalkyl residue or a cycloalkyl, cycloalkenyl or aryl residue or A is a hydrogen atom and B and D together are a methylene bridge, where R.sup.1 besides the aforementioned residues may be a possibly substituted hydrocarbon residue with up to 10 C atoms, a possibly substituted amino group, a hydroxy or C.sub.1-8 alkoxy, mercapto or thioalkyl group, R.sup.2 is a methyl or ethyl residue, and R.sup.3 /R.sup.4 represents the usual combination of substituents on the C17 atom in steroid chemistry, having antigestagenic and other properties.

Abstract: New 11.beta. phenyl-4,9,15-estratrienes of formula I ##STR1## are described, where X implies an oxygen atom or a hydroxyimino grouping N.about.OH,R.sup.1 stands for a hydrogen atom or a methyl group,R.sup.2 implies a hydrogen atom, an alkyl radical or an acyl radical with in each case 1 to 10 carbon atoms,R.sup.3 stands for a hydrogen atom, a cyanomethyl group, --(CH.sub.2).sub.n CH.sub.2 Z where n implies the numbers 0, 1, 2, 3, 4 or 5, Z=--H or --OR.sup.5 with R.sup.5 having the significance of a hydrogen atom or an alkyl or acyl group with in each case 1 to 10 carbon atoms, or for --(CH.sub.2).sub.m --C.tbd.C--Y where m=0-2 and Y implies a hydrogen, chlorine, fluorine, iodine or bromine atom, an alkyl, hydroxyalkyl, alkoxyalkyl or acyloxyalkyl group with in each case 1 to 10 carbon atoms,R.sup.4 represents a straight-chain or branched-chain, saturated or unsaturated hydrocarbon radical with up to 8 carbon atoms which contains the grouping ##STR2## with X having the above significance.

Abstract: For passive range metering of moving vehicles a receiver is used having two detectors spaced apart and directed to the path of the vehicle which moves with constant speed and the length of which is known. The receiver measures the pass-through time of the image of the vehicle through the first detector and furthermore measures the traveling time of the image of the vehicle from one detector to the other. The distance E can be calculated by equation ##EQU1## wherein f is the focal distance of the receiver optics, Q.sub.t is the quotient of the measured time values, l is the length of the vehicle.

Abstract: A re-securable mine including a triggering or ignition circuit which is actuatable through the intermediary of a trigger securing arrangement. A re-securing block with a comparator is provided for a pregiven information or code and for an introduceable information or code, so as to reset the securing arrangement into the secured position at a pregivable relationship between the two informations or codes.

Abstract: An infrared simulator serves to directly transduce electron beams into infrared radiation. To this purpose a modified cathode-ray tube is provided which includes an infrared transmissive window. Behind this window a film within the vacuum of the cathode-ray tube is arranged in order to transduce the electron bombardment into infrared radiation.