Abstract: A method of a device for determining the spectral distribution of a nuclear magnetization in a limited volume, wherein each sequence of r.f. and gradient excitation comprises a sub-sequence which dephases the nuclear magnetization everywhere outside a defined layer. This sub-sequence is followed by three r.f. pulses, the first two of which are layer-selective. These three r.f. pulses excite the nuclear magnetization in an area of intersection between said layer and two layers which extend perpendicularly to one another and to said layer. In order to suppress undesirable FID signals and to enhance the spectrum, phase cycling is performed.

Abstract: The invention relates to an NMR tomography apparatus which, in addition to coil systems for generating a magnetic field which varies linearly in space, bar at least one further coil system for generating a magnetic field which varies non-linearly in space so that a locally non-constant gradient of the magnetic field is obtained. The variation of the spatial resolution is thus the same as that of the gradient of the magnetic field.

Abstract: A process for the production of highly pure bromine from heated bromine-containing solutions. The process is an improvement over prior bromine-extraction methods comprising introducing steam and chlorine countercurrent to heated bromine-containing solution into a bromine column having a reboiler said reboiler having a liquid zone and a gaseous zone, withdrawing a mixture of bromine, chlorine and steam overhead from said bromine column, condensing the mixture of bromine, chlorine and steam withdrawn overhead to form crude bromine and sour water and distilling the crude bromine so formed.

Abstract: Concentrated magnesium chloride solutions are prepared from industrial liquors or brines by debrominating the liquor with chlorine, neutralizing the debrominated liquor up to a ph value of 3-6, adding a stoichiometric excess of calcium chloride to the neutralized liquor at temperatures in the range of 30.degree.-50.degree. C to form a calcium sulfate dehydrate crystallizate, separating the crystallizate from the mother liquor, adding a sufficient amount of carnallite to the mother liquor to increase the MgCl.sub.2 content thereof to 270-330 g/l after cold decomposition of the added carnallite and concentrating the resulting solution in two or more steps in the direct current in an evaporator with crystallization characteristics up to a final concentration of 440 to 470 g/l MgCl.sub.2 whereafter the concentrated magnesium chloride solution is separated from crude crystallized carnallite and sodium chloride formed during the concentration.

Abstract: Concentrated magnesium chloride solutions are prepared from industrial liquors or brines by evaporating the liquor in a vacuum in two or more stages in a counter current evaporator with crystallization characteristics up to a final concentration of 440 to 475 g/l MgCl.sub.2, a solid content of 12 to 25% by weight and a final temperature of 95.degree. to 105.degree. C, whereafter the liquor is separated from crude crystallized carnallite and sodium chloride, is debrominated by the addition of chlorine, is neutralized by the addition of lime or dolomite milk, is separated in the heat from solid substances, is cooled to effect further crystallization, and is finally separated as a concentrated magnesium chloride solution containing 400 to 465 g/l MgCl.sub.2.