Abstract: A system for communication via satellite between a gateway and a plurality of terminals comprises: a controller device to calculate a time-frequency plan of burst signals from a terminal and to transmit, based on the time-frequency plan, to the terminal information including configuration information on transmit burst signals; a multi-carrier demodulator structure arranged to receive a resulting signal comprising receive signals and arranged to receive information for the receive signals.

Abstract: A wireless multiple access communication system (5) comprises a forward link (31) to a terminal (40) and a return link (32) from a terminal (40). The return link (32) uses a medium which is shared between terminals (40) on the basis of time and frequency. A terminal (40) transmits a return link signal (32) from the terminal comprising a sequence of transmission slots (51, 52, 53). each transmission slot being defined as a time slot and, carrier frequency, wherein carrier frequency and symbol, rate can change between transmission slots. The return link signal (32) is transmitted continuously across the sequence of transmission slots (51, 52, 53).

Abstract: In a process for cooling an article by applying a liquid coolant to the surface (20) of the article (18) in the form of continuous jets (16) of coolant, the delivery rate of each jet of coolant is set in such a manner that the coolant striking the surface (20) evaporates completely. The jets (16) of coolant are applied by means of a plurality of jets (16) of coolant of small diameter (d) distributed over the surface (20) to be cooled. Each jet (16) of coolant has a diameter (d) of 20 to 200 .mu.m.