Abstract: The compounds of formula (1), their pharmaceutically acceptable salts and their solvates, wherein R1 is a radical selected between hydrogen and alkyl; R2 is selected from hydroxyalkyl, phenyl, phenyl mono-substituted and phenyl di-substituted in positions 3 and 4; R3 is selected from phenyl, phenyl mono-substituted and phenyl di-substituted in positions 3 and 4; the substituents of the phenyl of R2 and R3 selected from halogen, (C1-C4)-alkyl and (C1-C4)-alkoxyl and R4 is selected from hydrogen, alkyl allyl and homoallyl, they are useful for the treatment of mycobacterial infections, in particular for the treatment of infections produced by Mycobacterium tuberculosis, Mycobacterium avium-intracellulare complex or Mycobacterium kansasii.

Abstract: The compounds of formula (1), their pharmaceutically acceptable salts and their solvates, wherein R1 is a radical selected between hydrogen and alkyl; R2 is selected from hydroxyalkyl, phenyl, phenyl mono-substituted and phenyl di-substituted in positions 3 and 4; R3 is selected from phenyl, phenyl mono-substituted and phenyl di-substituted in positions 3 and 4; the substituents of the phenyl of R2 and R3 selected from halogen, (C1-C4)-alkyl and (C1-C4)-alkoxyl and R4 is selected from hydrogen, alkyl allyl and homoallyl, they are useful for the treatment of mycobacterial infections, in particular for the treatment of infections produced by Mycobacterium tuberculosis, Mycobacterium avium-intracellulare complex or Mycobacterium kansasii.

Abstract: A frequency converter circuit has at least two outputs that are respectively connected to a load, in particular an induction coil. A first output is operated at a first switching frequency and a second output is simultaneously operated at a second switching frequency that is different from the first, in such a way that noise having a frequency generated by the superposition of the first switching frequency and the second switching frequency is produced. The frequency converter circuit is operated in such a way that the frequency of the noise is lower than a first cutoff frequency and/or is higher than a second cutoff frequency.

Abstract: Electric power steering for parking comprising a dc electric booster motor (1) provided with a clutch, a reduction gear (2), a steering wheel torque sensor (3), a vehicle speed sensor and an electronic circuit for control of the motor, characterized, on the one hand, in that the torque sensor delivers all-or-nothing signals, and, on the other hand, in that the boost ratio is proportional to the time during which the torque signal is present when the vehicle travels below a preset speed limit and is canceled when the vehicle exceeds this speed.