structure constant

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• Fine-structure constant — The fine structure constant or Sommerfeld fine structure constant, usually denoted alpha ,, is the fundamental physical constant characterizing the strength of the electromagnetic interaction.It is a dimensionless quantity, and thus its numerical …   Wikipedia

• fine structure constant — smulkiosios sandaros konstanta statusas T sritis Standartizacija ir metrologija apibrėžtis Apibrėžtį žr. priede. priedas( ai) Grafinis formatas atitikmenys: angl. fine structure constant vok. Feinstrukturkonstante, f rus. константа тонкой… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

• fine structure constant — smulkiosios sandaros konstanta statusas T sritis fizika atitikmenys: angl. fine structure constant vok. Feinstrukturkonstante, f rus. постоянная тонкой структуры, f pranc. constante de la structure fine, f …   Fizikos terminų žodynas

• fine-structure constant — A dimensionless constant, equal to 7.297351 x 10 3 (approximately 1/137), given by 2π times the square of the electron charge, divided by the product of the speed of light and Planck s constant …   Dictionary of automotive terms

• fine-structure constant — noun The fundamental physical value α, presumed to be constant, that characterizes the strength of the electromagnetic force …   Wiktionary

• fine-structure constant — ¦ ̷ ̷ ˈ ̷ ̷  ̷ ̷ noun : a dimensionless constant that is a measure of the strength of electromagnetic interactions of subatomic particles and that has an approximate value of 0.0073 or 1/137 symbol α …   Useful english dictionary

• STRUCTURE ET FONCTION — L’étude de la relation entre les structures et les fonctions est au cœur même de la biologie. Cette relation s’exprime chez les êtres vivants par l’adaptation des premières aux secondes et pose une série de problèmes absolument fondamentaux,… …   Encyclopédie Universelle

• Constant — Con stant, n. 1. That which is not subject to change; that which is invariable. [1913 Webster] 2. (Math.) A quantity that does not change its value; used in countradistinction to {variable}. [1913 Webster] 3. (Astron.) A number whose value, when… …   The Collaborative International Dictionary of English

• Constant of aberration — Constant Con stant, n. 1. That which is not subject to change; that which is invariable. [1913 Webster] 2. (Math.) A quantity that does not change its value; used in countradistinction to {variable}. [1913 Webster] 3. (Astron.) A number whose… …   The Collaborative International Dictionary of English

• Constant of integration — Constant Con stant, n. 1. That which is not subject to change; that which is invariable. [1913 Webster] 2. (Math.) A quantity that does not change its value; used in countradistinction to {variable}. [1913 Webster] 3. (Astron.) A number whose… …   The Collaborative International Dictionary of English

• Constant proportion portfolio insurance — (CPPI) is a capital guarantee derivative security that embeds a dynamic trading strategy in order to provide participation to the performance of a certain underlying asset. See also dynamic asset allocation. The intuition behind CPPI was adopted… …   Wikipedia