IVANOV 140 



became a professor. From 1948 to 1955 he was Director of the 

 Institute of Mathematics of the Ukrainian S.S.R. Academy of 

 Sciences and also a professor at Kiev University. In 1955 he 

 was appointed director of a scientific research institute. He 

 has been a member of the Communist Party of the Soviet Union 

 since 1940. He was elected Academician of the Ukrainian 

 S.S.R. Academy of Sciences in 1948, and in 1960 Academician of 

 the U. S.S.R. Academy of Sciences. 



Ishlinskii's main investigations are in general mechanics, 

 elasticity, and oscillations. He presented a theory of gyro- 

 scopic devices, investigated the behavior of complex gyroscopic 

 systems on a movable base, and gave the theoretical basis for 

 a space gyroscope. 

 Bibliography: 



Mechanics of Special Gyroscopic Systems. Kiev: 1952. 



Dynamical forms of stability loss of elastic systems. Dok- 



lady Akad. Nauk S.S.S.R., 1949, 64, #6. 



On the dynamics of soil masses. Doklady Akad. Nauk 



S.S.S.R., 1954,15, #4. 



General theory of plasticity with a linear strengthening. 



Ukr. Mat. Zhur., 1954, #3. 



Sketches in History of Technology. Kiev: 1955. 



On the theory of a horizon-compass. Priklad. Mat. i Mekh., 



1956, #4. 



The theory of a gyroscopic pendulum. Priklad. Mat. i Mekh., 



1957, #1. 



Theory of a bigyroscopic gyrovertical. Priklad. Mat. i 

 Mekh., 1957, #2. 

 Office: Academy of Sciences Ukrainian SSR 



Vladimirskaya Ulitsa 5 

 Kiev, Ukrainian SSR 



IVANOV, LEONID ALEKSANDROVICH (Deceased, April 12, 

 1962). 

 L. A. Ivanov was born February 24, 1871. He graduated 

 from Moscow University in 1895. From 1904 to 1941, he was 

 professor at the Institute of Forestry (now the S. M. Korov 

 Forest-Technical Academy). From 1938 to 1947, he headed the 

 photosynthesis laboratory of the Institute of Plant Physiology of 

 the U. S.S.R. Academy of Sciences. Since 1944, he has been the 

 chief of the Laboratory on the Physiology and Ecology of Wood 

 Strains of the U. S.S.R. Academy of Sciences Institute of Forests. 

 He became a Corresponding Member of the U. S.S.R. Academy 

 of Sciences in 1922. 



