[en] The results of investigation of level supersonic signal indicators with continuous and impulse radiator excitation in N₂O₄ medium in the range of temperatures from +20 up to +150 deg C and pressure 0-10 MPa are presented. It has been proved experimentally that the signal indicators with radiator impulse excitation show the best performance for these conditions. They can be widely used for provision of the normal operation of large-scale experimental stands and plants with gas-liquid cycle using nitrogen tetroxide as a coolant and working medium

[en] Specially developed level indicator is suggested with differential to-transformer converter of the float motion, operating in line with a movable electronic block, intended for indicating the level of the dissociating nitrogen tetroxide liquid phase. On the basis of the indicator elements the device is realized to measure the time of calibrated volume fillino. in by liquid nitrogen tetroxide in steady state operation of the experimental bench-marks

[en] Possibility of preparation of 2223 single-phase samples in Bi-Pb-Sr-Ca-Cu-O system, using solid-phase method, was investigated. Ceramic samples with T₀=116 K temperature of transformation to superconducting state were synthesized. Fine monocrystals of 2223 were prepared by the method of recrystallization. Their real compositions and superconducting properties were studied