The invention concerns a method for making a radiation heating structure comprising a heating film electrically powered to produce Joule heating, a radiating film comprising radiating additives and a thermally insulating film. An obturator tip is carried by the filter and shaped to rest against the distal end of the elongate tubular member when the filter is within the lumen of the tubular member. A method of cooling a turbine includes generating a cooling gas flow with a blower to be passed through a rotor cavity of the turbine; and delivering the cooling gas flow to the turbine. Preferably, the solation agent is added to the non-fluid medium together with the sample. Due to the voltage stabilizing unit, in a programming process, the voltage applied to the bit lines which are not related with programming may not drop as a result of current leakage.