ferrite element
81Vacuum tube — This article is about the electronic device. For experiments in an evacuated pipe, see free fall. For the transport system, see pneumatic tube. Modern vacuum tubes, mostly miniature style In electronics, a vacuum tube, electron tube (in North… …
82Electronic component — Various components An electronic component is a basic electronic element and may be available in a discrete form having two or more electrical terminals (or leads). These are intended to be connected together, usually by soldering to a printed… …
83Mixed oxide — For nuclear reactor fuel, see MOX fuel. In chemistry, a mixed oxide is a somewhat informal name for an oxide that contains more than one chemical element in its cation, or of a single element cation that has atoms in several states of oxidation.… …
84MÉTALLOGRAPHIE - Essais non destructifs — Le but des méthodes non destructives d’examen est de déceler dans une pièce le plus souvent métallique, et en respectant son intégrité, toute particularité de sa structure qui peut avoir une influence sur son comportement en service. Il en sera… …
85MÉTALLOGRAPHIE - Essais physiques — Les principales caractéristiques physiques, en tout cas celles d’usage le plus courant, concernent respectivement la dilatation, la résistivité électrique, la capacité thermique massique, la conductivité thermique, les propriétés magnétiques, le… …
86Microcode — is a layer of hardware level instructions and/or data structures involved in the implementation of higher level machine code instructions in many computers and other processors; it resides in special high speed memory and translates machine… …
87Electromagnet — An electromagnet is a type of magnet in which the magnetic field is produced by the flow of electric current. The magnetic field disappears when the current is turned off. Electromagnets are widely used as components of other electrical devices,… …
88Crystal 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… …
89Project Rainbow — is the name commonly given to two separate United States secret military projects in the 20th century, both concerned with stealth and radar invisibility: one of which is considered a conspiracy theory while the other appears to be factual. At… …
90Magnetic storage — and magnetic recording are terms from engineering referring to the storage of data on a magnetized medium. Magnetic storage uses different patterns of magnetization in a magnetizable material to store data and is a form of non volatile memory.… …
