Yasuhiko Arakawa Yasuhiko Arakawa Yasuhiko Arakawa (Japanese , "Arakawa Yasuhiko"; born 6 November 1952) is a Japanese physicist. His research focuses on semiconductor physics, including growth of nanostructures and their optoelectronic applications. Among his main achievements are the proposal of the concept of quantum dots and their application to quantum dot lasers, the observation of exciton-polariton Rabi-splitting in a semiconductor microcavity, or, recently, the first 3D photonic crystal nanocavity lasers with quantum dot gain. Yasuhiko Arakawa received a B.S. degree in 1975 and a Ph.D. degree in 1980, respectively, from the University of Tokyo, both in Electronics Engineering. In 1981 he became
Japanese gunboat Sumida (1903) one smokestack to "Fushimi's" twin stack. "Sumida" was launched in June 1903, but was brought to Shanghai for final fitting out, but work was halted by official British neutrality in the Russo-Japanese War, the unfinished ship was impounded in until the end of that conflict. She was finally commissioned into the Japanese navy as a second-class gunboat on June 17, 1906. "Sumida" remained based at the International Settlement in Shanghai. During World War I, due to the official neutrality of the Republic of China, "Sumida"'s weaponry was placed under lock in 1914, and was not freed until China officially joined