Abstract: A barrier discharge lamp wherein an ultraviolet radiation flux is emitted by a working gas confined between two coaxial silica tubes connected at both ends. The gas is subjected to electrical pulses supplied by a generator and applied between an inner and an outer electrode including a conductive window. The cooling is provided by a driven air flow, in particular in the tube, by a fan. Its efficacy is enhanced by a radiator associated with the inner electrode, and by a convective working gas flow. The flow is provided not only around the tube in the vicinity of the electrodes, but in an axial plane with channels on either side of the tube at both ends thereof spaced apart from at least one of the electrodes. The invention is applicable to industrial processes and medical treatments using ultraviolet radiation with very small spectral width, and for treating psoriasis and vitiligo.

Abstract: An installation for heating grounds, in particular sports grounds, using cables (9, 9?, 9?) supplied with electric current which are buried in the ground. The installation is characterized in that the surface of the grounds to be heated is divided into a number of sectors (1a, 1b, 1c, . . . , 1n), and each sector is heated by at least two heating lines (9, 9?, 9?) constituting each a secondary of a common transformer (3a, 3b et 3c).

Abstract: A powerful glow discharge lamp comprising two coaxial tubes, the outer tube being optically transparent, with a cathode and anode placed at opposite ends of the tubes, the space between the tubes being filled with working gas. The electrodes are made as cylindrical tumblers placed in line to one other in such a way that one end of the cathode is inserted into the inner tube, one end of the anode coaxially covers the end of the outer tube, the inner tube penetrating and extending through the anode. The increased electrodes' surface area increases glow discharge electron current and, correspondingly, average radiation power of discharge plasma. The inner tube contains at least one cooling liquid tube placed along the axis of the inner tube along the entire lamp length to provide cathode cooling. The anode has a circumferential heat extracting radiator which removes heat from the anode.