Léon Brillouin: Diferenzas entre revisións
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==Traxectoria==
Dende 1908 ata 1912 estudou física na [[École Normale Supérieure]] de [[París]]. Dende 1911 estudou baixo Jean Perrin ata que marchou á [[Universidade Ludwig Maximilians de Múnic]] (LMU) en 1912. Alí estudou física teórica con [[Arnold Sommerfeld]]. En 1913 volveu a Francia para estudar na [[Universidade de París]]. Durante a [[primeira guerra mundial]] servíu no exército, desenvolvendo o [[amplificador de válvulas]] xunto a G. A. Beauvais.<ref>M. A. Ainslie, Principles of Sonar Performance Modeling (Springer, 2010), p12</ref> Trala fin da guerra volveu á Universidade de París para continuar cos seus estudos con [[Paul Langevin]], e recibiu o
After receipt of his doctorate, Brillouin became the scientific secretary of the reorganized ''[[EDP Sciences#History|Journal de Physique et le Radium]]''. In 1932, he became associate director of the physics laboratories at the [[Collège de France]]. In 1926, [[Gregor Wentzel]],<ref>Gregor Wentzel ''Eine Verallgemeinerun der Quantenbedingungen für die Zwecke der Wellenmechanik'', ''Z. Physik.'' '''38''' 518–529 (1926). As cieted in Mehra, 2001, Volume 5, Part 2, p. 961.</ref> [[Hendrik Anthony Kramers|Hendrik Kramers]],<ref>H. A. Kramers ''Wellenmechanik und halbzahlige Quantisierung'', ''Z. Physik.'' '''39''' 828-840 (1926). As cited in Mehra, 2001, Volume 5, Part 2, p. 920.</ref> and Brillouin<ref>Léon Brillouin ''La mécanique ondulatoire de Schrödinger; une méthode générale de resolution par approximations successives'', ''Comptes rendus'' (Paris) '''183''' 24–26 (1926). As cited in Mehra, 2001, Volume 5, Part 2, p. 882.</ref> independently developed what is known as the [[WKB approximation|Wentzel–Kramers–Brillouin approximation]], also known as the ''WKB method'', ''classical approach'', and ''phase integral method''.<ref>Schiff, 1968, p. 269.</ref> In 1928, after the [[Institut Henri Poincaré]] was established, he was appointed as professor to the Chair for Theoretical Physics. During his work on the propagation of electron waves in a crystal lattice, he introduced the concept of [[Brillouin zone]]s in 1930. Quantum mechanical perturbations techniques by Brillouin and by [[Eugene Wigner]] resulted in what is known as the Brillouin–Wigner formula.<ref name="Mehra, Volume 5, Part 2, p. 579"/><ref name="Léon Brillouin"/><ref>[http://www.amphilsoc.org/library/guides/ahqp/ Author Catalog: Brillouin] {{webarchive|url=https://web.archive.org/web/20070205234854/http://www.amphilsoc.org/library/guides/ahqp/ |date=2007-02-05 }} – American Philosophical Society</ref>
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