[1] He was born in Crevenicu, Teleorman County, in a family of peasants, and completed his secondary studies at the Matei Basarab High School in Bucharest.
He then studied in the Department of Physics and Mathematics of the University of Bucharest, where he took courses with teachers such as Spiru Haret, Marin Alexe [ro], and Emanoil Bacaloglu.
Miculescu is noted for his 1891 determination, with great precision, of the mechanical equivalent of the calorie using water circulated in a calorimeter.
[4] Miculescu died in Bucharest at age 74, and was buried, according to his wishes, at Cula Sultănica in Șuici, Argeș County.
[4][5] An award of the Romanian Academy bears his name,[1][6] and his bust by the sculptor Cornel Medrea is exhibited at the University of Bucharest.