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) the Allies. "Sumida" saw combat service in the Second Sino-Japanese War, beginning with the First Shanghai Incident in 1931. "Sumida" continued to operate on the Yangtze River in China during the early 1930s, but was already considered obsolete, and was struck from the navy list on March 1, 1935. She was scrapped on March 31, 1935 at Shanghai. Japanese gunboat Sumida (1903) "Sumida" was the first gunboat in the Imperial Japanese Navy inventory designed specifically for inland river service. The need for such a vessel to operate on the rivers of the Asian mainland to protect Japanese commercial interests at