Léon N. Brillouin ( August 7 is the 219th day of the year in the Gregorian Calendar (220th in leap years), with 146 days remaining. There are 94 days in North Hemisphere summer, South Hemisphere winter. The Northern Hemisphere is considered to be halfway through the summer on August 7. Events 1600-1899 1679... August 7, Events January-April January 8 - Herman Hollerith receives a patent for his electric tabulating machine January 22 - Columbia Phonograph is formed in Washington, DC. February 11 - Japan adopted; 1st Diet convenes in 1890 January 30 ? Crown Prince Rudolf of Austria and his mistress Marie Vetsera commit a double suicide... 1889- 1969 was a common year starting on Wednesday (the link is to a full 1969 calendar). For other uses, see Number 1969. For the movie, see 1969 (movie). Events January January 1 - Australian media baron Rupert Murdoch purchases the largest selling British Sunday newspaper The News Of The World January... 1969) was a The French Republic or France ( French: République française or France) is a country whose metropolitan territory is located in western Europe, and which is further made up of a collection of overseas islands and territories located in other continents. France is a democracy organised as a... French physicist. His father Marcel Brillouin was a physicist as well. He was born in Sèvres, France, and died in This is an article about New York City; see also NYC, New York, and New York, New York. Midtown Manhattan, looking north from the Empire State Building, 2005. New York City (officially named the City of New York) is the most populous city in the United States and is at... New York City.

See also: In mathematics and solid state physics, the first Brillouin zone is the primitive cell in the reciprocal lattice in momentum space. It is found by the same method as for the Wigner-Seitz cell in the Bravais lattice. Taking the surfaces at the same distance from one element of the... Brillouin zone, Brillouin scattering occurs when light in a medium (such as water or a crystal) interacts with density variations and changes its path. The density variations may be due to acoustic modes (travelling sound waves) or temperature gradients. As described in classical physics, when the medium is compressed, the index of... Brillouin scattering, Laboratoire Léon Brillouin (the french In quantum physics, neutrons are particles that can occur as building blocks of atomic nuclei. In a nuclear reactor, neutrons can be set free when nuclei decay (fission, radioactivity). All quantum particles can exhibit wave phenomena we typically associate with light or sound. Diffraction is one of those phenomena; it... neutron scattering center)