Abstract: In a method of manufacturing a gold containing pigment, a vaporizable gold compound, a vaporizable compound of another metal, which includes an oxide or a nitride with a melting temperature above the melting temperature of gold, and a reaction gas consisting of a mixture of argon and oxygen are introduced into a first microwave plasma, whereby cores covered with gold clusters are formed from the oxide or nitride and the gold cluster covered cores are subjected to a tempering process at 150° C. to 300° C. for causing coloration of the gold cluster covered oxide or nitride cores.

Abstract: A method for producing coated particles includes the steps of converting particles consisting of a compound of one of (a) a metal with a non-metal or (b) a semi-metal with a non-metal to an aerosol form; contacting the particles in aerosol form with a gas including at least one aromatic compound; and guiding the particles in aerosol form together with the gas through a plasma zone of a microwave plasma. The at least one aromatic compound is preferably selected from the group consisting of benzol, benzol derivatives, naphthalene, and naphthalene derivatives. The gas preferable further includes at least one metallocene which is preferably selected from the group consisting of ferrocene or magnesocene.

Abstract: In a method of manufacturing a gold containing pigment, a vaporizable gold compound, a vaporizable compound of another metal, which includes an oxide or a nitride with a melting temperature above the melting temperature of gold, and a reaction gas consisting of a mixture of argon and oxygen are introduced into a first microwave plasma, whereby cores covered with gold clusters are formed from the oxide or nitride and the gold cluster covered cores are subjected to a tempering process at 150° C. to 300° C. for causing coloration of the gold cluster covered oxide or nitride cores.

Abstract: There is described a process for the production of ceramic fuel pellets which contain fission and/or fertile material in oxidized form, by heating porous green fuel pellets in a reducing atmosphere to a temperature below 2500.degree. C., molding in a die, ejecting from the die and cooling the finished pellets. Thereby the heating and cooling is carried out stepwise whereby the heating and cooling speed below 1200.degree. C. is less than 30.degree. C./second and above 1200.degree. C. is greater than 30.degree. C./second.

Abstract: Every image point of an image of a sample formed by an optical objective, focussed by, for each image point, deriving a representation of the autocorrelation function of the brightness distribution of the image of that image point, deriving a representation of the average of the autocorrelation function of the brightness distribution of a plurality of image points in the region of that image point, deriving a representation constituting a function of the quotient formed by dividing the representation of the autocorrelation function for that image point by the representation of the average of the autocorrelation function, and varying the distance between the objective and the sample while iteratively performing the above steps of deriving for determining the distance at which the function of the quotient has a maximum value.