Abstract: The high temperature superconducting material is made from a base material having two opposing surfaces and including a high purity yttrium barium copper oxide compound having a YBa.sub.2 Cu.sub.3 O.sub.7-x (123) composition with silver oxide. The method of making the superconducting material includes controlling a temperature of each opposing surface of the base material to form a time-dependent spatial temperature gradient across the base material; measuring the time-dependent spatial temperature gradient, determining whether it is within a desired range and controlling it so that the time-dependent spatial temperature gradient remains within the desired range, thereby melt-texturing the base material while decomposing the silver oxide into silver and transforming the base material into quasi-crystalline superconducting regions having YBa.sub.2 Cu.sub.3 O.sub.7-x (123) composition, intrinsically non-superconducting material zones consisting of coherent yttrium-rich material having a Y.sub.2 BaCuO.sub.

Abstract: A method for controlling the operation of uranium enrichment systems in which gaseous uranium compounds are processed. The method comprises separating at one or a plurality of precipitation points in the system the process uranium gas and/or its secondary products in small quantities, measuring the radioactive radiation of the separated uranium gas and/or its secondary products, identifying the age of the gas passing through the precipitation points by means of the radioactive radiation measurements and then controlling a parameter of the system with the accumulated data of the process gas and its secondary products.