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On Ge: Sb crystals with dopant concentrations, N , ranging between 8 x 10l6 and 1.5 x 10'' cm-3, the temperature and concentration dependences are found of the mobility anisotropy coefficient, K , over the temperature interval 4.2 K 5 T 5 180 K and at T 5 4.2 K. At temperatures T, close to the Hall-coefficient-maximum temperature, the K versus T curve exhibits a minimum at T = Tmin. The temperature Tmin corresponds to the boundary that separates the regions of weak and strong electron scattering. At sufficiently low temperatures, where the scattering is strong (the impurity and band states of electrons are mixed), neither the formulae for classical conductivity nor the formulae of the theory of quantum corrections permit a reliable determination of the value of mobility anisotropy K . Ha KpUCTaJIJIaX Ge

Sub-second time structure of hard X-rays observed during solar flares by spectrometer "IRIS" on a board of CORONAS satellite are discussed. The burst duration of 80ms and FWHM about 30ms are recorded in powerful flare of

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