amplification ratio
51Environmental scanning electron microscope — Wool fibers imaged in an ESEM by the use of two symmetrical plastic scintillating backscattered electron detectors …
52Laser — For other uses, see Laser (disambiguation). United States Air Force laser experiment …
53Crystal radio — Crystal set redirects here. For the Australian rock band, see The Crystal Set. A modern reproduction of an antique crystal set. It is tuned to different stations by moving the sliding contact (right) up and down the tuning coil (red). The device… …
54electromagnetic radiation — Physics. radiation consisting of electromagnetic waves, including radio waves, infrared, visible light, ultraviolet, x rays, and gamma rays. [1950 55] * * * Energy propagated through free space or through a material medium in the form of… …
55Decibel — This article is about the ratio of measures. For sound or acoustic level, see Sound pressure. For other uses, see Decibel (disambiguation). Attenuation chart of an RG 6 Coaxial cable, measured in decibels per 100 feet of cable The decibel (dB) is …
56Valve amplifier — A valve amplifier or tube amplifier is a type of electronic amplifier that make use of vacuum tubes instead of solid state semiconductor devices (such as transistors). As any other electronic amplifier they serve to increase the power and/or… …
57Gene duplication — Schematic of a region of a chromosome before and after a duplication event Gene duplication (or chromosomal duplication or gene amplification) is any duplication of a region of DNA that contains a gene; it may occur as an error in homologous… …
58Capteur photographique — Des capteurs semblables sont utilisés dans différents équipements : caméras diverses, caméscope, scanner notamment. Cet article est consacré à ceux utilisés pour la photographie. Un capteur photographique est un composant électronique… …
59Guitar — Infobox Instrument name=Guitar names= classification=String instrument (plucked, nylon stringed guitars usually played with fingerpicking, and steel , etc. usually with a pick.) range= (a regularly tuned guitar) related=*Bowed and plucked string… …
60Negative feedback amplifier — Figure 1: Ideal negative feedback model A negative feedback amplifier (or more commonly simply a feedback amplifier) is an amplifier which combines a fraction of the output with the input so that a negative feedback opposes the original signal.… …
