Abstract: The invention comprises real-time down-hole intelligent communication based on the characterization of signal attenuation caused by a coaxial cable used as a communication medium and by frequency response changes of the electronic components of the transmitters and receivers, generated by the down-hole operating environment. The invention relates to a method for the real-time characterization of the attenuation response of a two-way communication system using a coaxial cable, consisting in: generating test tones for the real-time characterization of the attenuation response of a two-way communication system in the transmission and reception bands, measuring the signals received, estimating noise and the ratio to the communication signal, comparing with reference responses, adjusting the transmission and reception frequencies in order to maintain the communication with the maximum signal-to-noise ratio.

Abstract: The invention relates to a system and a method for measuring electrical energy with functions of pre-pay and data collection by means of an optical recharging device, comprising an electronic pre-pay meter with a supply connection/deconnection module, an optical recharging device, an energy sale-purchase module, a server containing measurement data collection and recharging management software, and a remote communication network.

Abstract: The invention comprises real-time down-hole intelligent communication based on the characterisation of signal attenuation caused by a coaxial cable used as a communication medium and by frequency response changes of the electronic components of the transmitters and receivers, generated by the down-hole operating environment. The invention relates to a method for the real-time characterisation of the attenuation response of a two-way communication system using a coaxial cable, consisting in: generating test tones for the real-time characterisation of the attenuation response of a two-way communication system in the transmission and reception bands, measuring the signals received, estimating noise and the ratio to the communication signal, comparing with reference responses, adjusting the transmission and reception frequencies in order to maintain the communication with the maximum signal-to-noise ratio.

Abstract: There is disclosed an acoustic device for manipulation of fluid samples including fluid samples comprising particles characterised in that it comprises a flexible member, a sound wave generator for generating a sound wave and a sound wave coupler for coupling the sound wave from the generator into the flexible member, in which the device, flexible member and the coupler are adapted to excite a predetermined acoustic mode of pure resonant vibration in the flexible member at a predetermined frequency of the sound wave.