angular amplitude
61Photon — This article is about the elementary particle of light. For other uses, see Photon (disambiguation). Photon Photons emitted in a coherent beam from a laser Composition Elementary particle …
62Propagation constant — The propagation constant of an electromagnetic wave is a measure of the change undergone by the amplitude of the wave as it propagates in a given direction. The quantity being measured can be the voltage or current in a circuit or a field vector… …
63Saccade — A saccade is a fast movement of an eye, head or other part of an animal s body or device. It can also be a fast shift in frequency of an emitted signal or other quick change. However, this article deals with saccadic eye motion. Eye saccades are… …
64Monopulse radar — is an adaptation of conical scanning radar which sends additional information in the radar signal in order to avoid problems caused by rapid changes in signal strength. The system also makes jamming more difficult. Most radars designed since the… …
65History of string theory — 1943 1958: S Matrix String theory is an outgrowth of a research program begun by Werner Heisenberg in 1943, picked up and advocated by many prominent theorists starting in the late 1950s and throughout the 1960s, which was discarded and… …
66permafrost — /perr meuh frawst , frost /, n. (in arctic or subarctic regions) perennially frozen subsoil. Also called pergelisol. [1943; PERMA(NENT) + FROST] * * * Perennially frozen earth, with a temperature below 32 °F (0 °C) continuously for two years or… …
67Insect wing — Original veins and wing posture of a dragonfly. Hoverflies hovering to mate …
68Mode shape — ] In the study of vibration in engineering, a mode shape describes the expected curvature (or displacement) of a surface vibrating at a particular mode. To determine the vibration of a system, the mode shape is multiplied by a function that… …
69Radar sensor — Radio detection and ranging (radar) is used to sense angle, range and velocity of (moving) scatterers in the environment [Skolnik, M. I.: Introduction to Radar Systems, 3rd Ed. . McGraw Hill, 2005] [Stimson, G. W.: Introduction to Airborne Radar …
70Multipole radiation — is a theoretical framework for the description of electromagnetic or gravitational radiation from time dependent distributions of distant sources. These tools are applied to physical phenomena which occur at a variety of length scales from… …
