Cor (musique)Le cor est le nom générique de plusieurs instruments de musique à vent. Son nom vient des cornes avec lesquelles furent conçues les premières formes « archaïques » des cors. En allemand comme en anglais, le cor est appelé horn (de même que la corne animale). Le mot cor désigne : soit un instrument à embouchure rudimentaire en corne ; soit un instrument à embouchure en métal, à perce conique, enroulé sur lui-même en cercle, même partiellement et se terminant par un large pavillon ; soit un instrument à anche de la famille des bois.
Crossbar switchIn electronics and telecommunications, a crossbar switch (cross-point switch, matrix switch) is a collection of switches arranged in a matrix configuration. A crossbar switch has multiple input and output lines that form a crossed pattern of interconnecting lines between which a connection may be established by closing a switch located at each intersection, the elements of the matrix. Originally, a crossbar switch consisted literally of crossing metal bars that provided the input and output paths.
Electronic switchIn electronics, an electronic switch is a switch controlled by an active electronic component or device. Without using moving parts, they are called solid state switches, which distinguishes them from mechanical switches. Electronic switches are considered binary devices because they dramatically change the conductivity of a path in electrical circuit between two extremes when switching between their two states of on and off.
Submarine power cableA submarine power cable is a transmission cable for carrying electric power below the surface of the water. These are called "submarine" because they usually carry electric power beneath salt water (arms of the ocean, seas, straits, etc.) but it is also possible to use submarine power cables beneath fresh water (large lakes and rivers). Examples of the latter exist that connect the mainland with large islands in the St. Lawrence River. The purpose of submarine power cables is the transport of electric current at high voltage.
Collecteur tournantvignette|upright=1.5|Principe du collecteur tournant Les collecteurs tournants ou rotatifs sont des organes électriques, présents notamment dans des moteurs, permettant de créer une connexion électrique entre une partie fixe (stator) et, une partie tournante (rotor). Ils sont utilisés dans le cas d'une rotation multi-tours du rotor autour du stator, là où une transmission par câble serait impossible (car le câble s'enroulerait autour du stator et causerait très rapidement une défaillance électro-mécanique).
Stored program controlStored program control (SPC) is a telecommunications technology for telephone exchanges. Its characteristic is that the switching system is controlled by a computer program stored in a memory in the switching system. SPC was the enabling technology of electronic switching systems (ESS) developed in the Bell System in the 1950s, and may be considered the third generation of switching technology. Stored program control was invented in 1954 by Bell Labs scientist Erna Schneider Hoover, who reasoned that computer software could control the connection of telephone calls.
