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) 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 various treaty ports had been perceived even before the Boxer Rebellion. The Japanese government turned to the United Kingdom, and placed an order for such two such vessels in 1903: one the "Sumida" to John I. Thornycroft & Company and the other to Yarrow Shipbuilders in Scotland. "Sumida", was slightly larger than "Fushimi" and easily distinguishable by having