signal attenuation
121Laser beam profiler — A laser beam profiler captures, displays, and records the spatial intensity profile of a laser beam at a particular plane transverse to the beam propagation path. Since there are many types of lasers ultraviolet, visible, infrared, continuous… …
122Otto Julius Zobel — Born October 20, 1887(1887 10 20) Ripon, Wisconsin Died January 1970 (age 82) Morristown, New Jersey …
123Transparency and translucency — Diaphanes redirects here. For the genus of firefly, see Diaphanes (beetle). Translucence redirects here. For other uses, see Translucence (disambiguation). Translucent redirects here. For the Japanese manga series, see Translucent (manga).… …
124AMPLIFICATEURS — Un amplificateur est un dispositif électronique qui réalise sur une grandeur électrique – tension ou intensité – porteuse d’information l’opération mathématique élémentaire: multiplication par une constante, et qui accroît l’énergie véhiculée par …
125Radio propagation — is a term used to explain how radio waves behave when they are transmitted, or are propagated from one point on the Earth to another. [ H. P. Westman et al, (ed), Reference Data for Radio Engineers, Fifth Edition , 1968, Howard W. Sams and Co.,… …
126Heaviside condition — The Heaviside condition, due to Oliver Heaviside (1850–1925), is the condition an electrical transmission line must meet in order for there to be no distortion of a transmitted signal. Also known as the distortionless condition, it can be used to …
127Active sensory systems — are sensory receptors that are activated by probing the environment with self generated energy. Examples include echolocation of bats and dolphins and insect antennae. Using self generated energy allows more control over signal intensity,… …
128Multipath — En télécommunications sans fil, le multipath est un phénomène qui se produit lorsqu’un signal radio se propage par plusieurs chemins et est reçu sur une antenne. Les causes de l’atténuation multipath sont la réflexion sur l’ionosphère, réfraction …
