International audienceThe permanent operation of a 3 axes magnetometer in the LSBB below 550 m of calcite rock is a unique system of magnetic observation: a rejection rate better than 3 fT/Hz over 40 Hz. The observation of magneto-ionosphere responses to wave emissions both at the epicentre and at their arrival at LSBB for earthquakes of magnitude larger than 3 is reported. A simple model predicts the starting time of these events. These results are compared with those provided by Doppler sounders for ionosphere responses to Rayleigh waves

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New characteristics obtained with metal-insulatormetal (MIM) diodes are studied. These new characteristics are interpreted according to the tunneling process, and they are compared with the characteristics one can obtain with the IN23 diodes.

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We report experimental results on frequency tuning in superconductive resonators and bandpass filters with controlling magnetic fields. The frequency shifts are attributed to the presence of vortices modifying the microwave penetration depth and therefore the kinetic inductance of the circuit. 7-pole microstrip filters with a center frequency of 14 GHz and a bandwidth of 4% were fabricated using YBaCuO films deposited on MgO substrate with Au ground plane. A negative frequency shift of −12 MHz for fields lower than 0.1 mT was observed at 40 K.