213 LAVRENKO 



converters, machines with excitation by permanent magnets, 

 alternating current generators, special machines). In 1924 he 

 proposed a three-phase bridge scheme of current rectification. 

 He took part in the planning of electrical equipment in the air- 

 plane "Maxim Gorki", in the solution of technical problems 

 associated with the starting of turbo and hydro generators in 

 power plants, and in the solution of the electrification of oil 

 fields. 

 Bibliography: 



Utilization of Electricity in Aviation and Motor Transport. 

 Moscow-Leningrad: 1954. 



and others. Basis of Electrical Equipment in Aircraft and 

 Automobiles. Moscow -Leningrad: 1955. 

 and others. Hysteresis of Electric Motors. Works of the 

 Moscow Institute of Energetics of V. M. Molotov. #16, 

 Moscow-Leningrad: 1956. 



Selection of single optimum frequencies for autonomous 

 systems of alternating current with special elements and 

 electric machines of automation. Session of the U.S.S.R. 

 Academy of Sciences on Scientific Problems of Automation 

 in Industry, October 15-20, 1956. Moscow: 1957. (Works 

 of a Session of the U.S.S.R. Academy of Sciences, 5. 

 Biography: 



Professor A. N. Larionov (On the 60th Anniversary since the 

 date of birth and 30th Anniversary of his scientific- 

 pedagogical activity. Electricity, 1950, #1. 

 Office: Institute of Automation and Remote Control of USSR 



Academy of Sciences 

 Kalanchevskaya Ulitsa 15 -a 

 Moscow, USSR 

 Residence: Krasnokazarmennaya, 12 



Moscow, USSR 

 Telephone: ZH 4 38 00 



LAVRENKO, EVGENII MIKHAILOVICH (Geobotanist) 



E. M. Lavrenko was born February 24, 1900. In 1921-1928, 

 he worked at the Botanical Gardens in Khar'kov. He was as- 

 sistant professor in 1929, and in 1931-1934 professor at Khar'- 

 kov Agricultural Institute. In 1934 he started working at the 

 Botanical Institute of the U.S.S.R. Academy of Sciences. Since 

 1946 he has been a Corresponding Member of the U.S.S.R. 

 Academy of Sciences. 



Lavrenko developed a new classification for steppe vege- 

 tation of the U.S.S.R. and proposed the zonal and provincial 



