closed-circuit telegraph system
51Histoire des techniques de télévision — L histoire des techniques de télévision concerne les avancées successives qui ont mené des premiers dispositifs d images mécaniques aux diffusions par satellite ou aux programmes sur téléphone portable. L histoire de la télévision comme média est …
52Relay — This article is about the electrical component. For other uses, see Relay (disambiguation). Automotive style miniature relay, dust cover is taken off A relay is an electrically operated switch. Many relays use an electromagnet to operate a… …
53Computers and Information Systems — ▪ 2009 Introduction Smartphone: The New Computer. The market for the smartphone in reality a handheld computer for Web browsing, e mail, music, and video that was integrated with a cellular telephone continued to grow in 2008. According to… …
54electromagnetism — /i lek troh mag ni tiz euhm/, n. 1. the phenomena associated with electric and magnetic fields and their interactions with each other and with electric charges and currents. 2. Also, electromagnetics. the science that deals with these phenomena.… …
55literature — /lit euhr euh cheuhr, choor , li treuh /, n. 1. writings in which expression and form, in connection with ideas of permanent and universal interest, are characteristic or essential features, as poetry, novels, history, biography, and essays. 2.… …
56Media and Publishing — ▪ 2007 Introduction The Frankfurt Book Fair enjoyed a record number of exhibitors, and the distribution of free newspapers surged. TV broadcasters experimented with ways of engaging their audience via the Internet; mobile TV grew; magazine… …
57Indiana — This article is about the U.S. state of Indiana. For other uses, see Indiana (disambiguation). Hoosier State redirects here. For the passenger train, see Hoosier State (train). State of Indiana …
58Action potential — In physiology, an action potential is a short lasting event in which the electrical membrane potential of a cell rapidly rises and falls, following a consistent trajectory. Action potentials occur in several types of animal cells, called… …
59Deepwater Horizon oil spill — 2010 oil spill and BP oil spill redirect here. For other oil spills in 2010, see 2010 oil spill (disambiguation). For the 2006 oil spill involving BP, see Prudhoe Bay oil spill. For the drilling rig and explosion, see Deepwater Horizon… …
60Northamptonshire — Coordinates: 52°17′N 0°50′W / 52.283°N 0.833°W / 52.283; 0.833 …
