nonlinear variation
51Calculus of variations — is a field of mathematics that deals with extremizing functionals, as opposed to ordinary calculus which deals with functions. A functional is usually a mapping from a set of functions to the real numbers. Functionals are often formed as definite …
52Hermann Moisl — Dr. Hermann Moisl is a senior lecturer in linguistics at Newcastle University and was educated at various institutes, including Trinity College Dublin and the University of Oxford. Research interests include, amongst others, computational… …
53Dispersion (optics) — This article is about dispersion of waves in optics. For other forms of dispersion, see Dispersion (disambiguation). In a prism, material dispersion (a wavelength dependent refractive index) causes different colors to refract at different angles …
54Michelson interferometer — A Michelson interferometer for use on an optical table. The Michelson interferometer is the most common configuration for optical interferometry and was invented by Albert Abraham Michelson. An interference pattern is produced by splitting a beam …
55Conjugate gradient method — A comparison of the convergence of gradient descent with optimal step size (in green) and conjugate vector (in red) for minimizing a quadratic function associated with a given linear system. Conjugate gradient, assuming exact arithmetic,… …
56Demetrios Christodoulou — Born October 19, 1951 (1951 10 19) (age 60) …
57Disc brake — Close up of a disc brake on a car On automobiles, disc brakes are often located with …
58Reassignment method — The method of reassignment is a technique forsharpening a time frequency representation by mappingthe data to time frequency coordinates that are nearer tothe true region of support of theanalyzed signal. The method has been… …
59Постоянная тонкой структуры — Постоянная тонкой структуры, обычно обозначаемая как , является фундаментальной физической постоянной, характеризующей силу электромагнитного взаимодействия. Она была введена в 1916 году немецким физиком Арнольдом Зоммерфельдом в качестве меры… …
60gravitation — gravitational, adj. gravitationally, adv. /grav i tay sheuhn/, n. 1. Physics. a. the force of attraction between any two masses. Cf. law of gravitation. b. an act or process caused by this force. 2. a sinking or falling …
