Beam-powered propulsion — is a class of spacecraft propulsion mechanisms that use energy beamed to the spacecraft from a remote power plant. Most designs are rocket engines where the energy is provided by the beam, and is used to superheat propellant that then provides… … Wikipedia
Tilt (optics) — In optics, the term tilt is a deviation in the direction a beam of light propagates. Tilt quantizes the average slope in both the X and Y directions of a wavefront or phase profile across the pupil of an optical system. In conjunction with Piston … Wikipedia
Laser 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… … Wikipedia
Accession Day tilt — The Accession Day tilts were a series of elaborate festivities held annually at the court of Elizabeth I of England to celebrate her Accession Day, November 17, also known as Queen s Day. [which was elevated into a Protestant feast day by adding… … Wikipedia
TwixT — is a two player abstract strategy game invented by Alex Randolph. It is a member of the connection game family, along with games such as Hex, Havannah, Y, PÜNCT and *Star.3M originally published TwixT as part of its Bookshelf Games line; Avalon… … Wikipedia
Antenna (radio) — Whip antenna on car … Wikipedia
Null fill — is used in radio antenna systems which are located on mountains or tall towers, to prevent too much of the signal from overshooting the nearest part of intended coverage area. Phasing is used between antenna elements to take power away from the… … Wikipedia
Microwave transmission — The atmospheric attenuation of microwaves in dry air with a precipitable water vapor level of 0.001 mm. The downward spikes in the graph correspond to frequencies at which microwaves are absorbed more strongly, such as by oxygen molecules… … Wikipedia
Phased array — This article is about general theory and electromagnetic phased array. For the ultrasonic and medical imaging application, see phased array ultrasonics. In wave theory, a phased array is a group of antennas in which the relative phases of the… … Wikipedia
Color television — Title card for NBC, promoting their broadcast in RCA color . Color television is part of the history of television, the technology of television and practices associated with television s transmission of moving images in color video. In its most… … Wikipedia
