Shulejkin Mikhail

Mikhail Shulejkin (1884-1939 gg.) One of the leading Soviet scientists in the field of Radio Engineering, Academy of Sciences of the USSR. In 1908, Mr.. graduated from St. Petersburg Polytechnic Institute, majored in electrical engineering, taught there. From 1913 to 1918. worked on radio-telegraph plant Maritime department. Since 1918. served in the Red Army (the military rank - Brigadier Engineer). From 1918 to 1921. guided radiofrequency laboratory military engineering management, with 1919. Professor of Moscow Higher Technical School, where he developed radio engineering department, from 1921. Professor of Institute of National Economy. In 1919-1929 he. - Chairman of the society of the radio, from 1938. Head of commission radio USSR.

M. V. Shulejkin developed the theory of the dispersion of short waves in a homogeneous ionized medium, derived a formula for determining the equivalent permittivity of the ionosphere, the coefficient of diffusion and absorption of waves as a function of frequency. He showed how to determine the magnitude of the phase velocity.

. Shulejkin introduced the concept of critical frequency, . which the refractive index of the ionosphere becomes zero, . proved, . that the waves, . longer, . than critical, . propagation occurs without reflection from the ionosphere and the wave goes into exoatmospheric.,

. M
. V. Shulejkin developed a theory of long-wave antennas, conducted a study of frame antennas. In addition, he published several papers on electrical engineering, in particular pointed to the existence of side bands in the amplitude modulated radio oscillations.