A petroleum well for producing petroleum products that incoroprates a system adapted to provide power to a down-hole device in the well. module 1 comprising at least one storage unit that contains the films, andor at least one supply unit that supplies the films for transfer by a second module, b. Pharmaceutical compositions and vaccines comprising such polypeptides or DNA sequences are also provided, together with antibodies directed against such polypeptides. The determination that indicators monitored by a rule do not correlate closely in their transitions is used to reduce the likelihood of the rule finding correlation of the indicators as a whole. 2 to 12 atom % of niobium and 0. The sensor includes an amplifier section that amplifies a voltage across opposite ends of at least one of resistors that constitute a bridge circuit, a current control section that is controlled based on an output voltage of the amplifier section, and an output terminal that is connected to one end of a heating element that is controlled to be energized by the current control section.