acoustic emission signal
61Piézoélectricité — Illustration du comportement d’une pastille piézoélectrique : la contrainte appliquée crée un signal électrique. La piézoélectricité (du grec piézein presser, appuyer) est la propriété que possèdent certains corps de se polariser… …
62Physical Sciences — ▪ 2009 Introduction Scientists discovered a new family of superconducting materials and obtained unique images of individual hydrogen atoms and of a multiple exoplanet system. Europe completed the Large Hadron Collider, and China and India took… …
63Fading — This article is about signal loss in telecommunications. For the poetry book, see Fading (book). For other uses, see Fade (disambiguation). Frequency selective time varying fading causes a cloudy pattern to appear on a spectrogram. Time is shown… …
64List of radio propagation topics — This is a list of radio propagation terms. NOTOC A a index A index aa index active prominence active prominence region (APR) active region active surge region (ASR) active dark filament (ADF) AE index Air Force Geophysics Laboratory (AFGL) arch… …
65Chain Home — / AMES TYPE 1 (Air Ministry Experimental Station = Station expérimentale du Ministère de l Air) était le nom de code pour la chaîne côtière de stations radar construite par les Britanniques avant et pendant la seconde Guerre mondiale. Le système… …
66Chain home — / AMES TYPE 1 (Air Ministry Experimental Station = Station expérimentale du Ministère de l Air) était le nom de code pour la chaîne côtière de stations radar construite par les Britanniques avant et pendant la seconde Guerre mondiale. Le système… …
67List of electronics topics — Alphabetization has been neglected in some parts of this article (the b section in particular). You can help by editing it. This is a list of communications, computers, electronic circuits, fiberoptics, microelectronics, medical electronics,… …
68Audio feedback — (also known as the Larsen effect after the Danish scientist, Søren Larsen, who first discovered its principles) is a special kind of positive feedback which occurs when a sound loop exists between an audio input (for example, a microphone or… …
69Torpedo — The modern torpedo (historically called an automotive, automobile, locomotive, or fish torpedo) is a self propelled explosive projectile weapon, launched above or below the water surface, propelled underwater toward a target, and designed to… …
70Photoacoustic spectroscopy — is based on the photoacoustic effect. The discovery of the photoacoustic effect dates to 1880 when Alexander Graham Bell showed that thin discs emitted sound when exposed to a beam of sunlight that was rapidly interrupted with a rotating slotted… …
