We have observed the zero resistance state up to 210 K in the
mixed system of nominal composition Yj.2BaOSCu04-prepared
under simultaneous action oi pulsed electric field up to 30 kV/cm
and uniaxial force of 180 kN. The onset of the decrease of the
resistance at 281 K in the repeated cycles and preliminary data
diamagnetism are understood by us as a possible superconductivity
event related to a particular composition