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Scoop. In stage lighting, an ellipsoidal reflector floodlight (sometimes known by the acronym ERF which is often pronounced "erf"), better known as a scoop, is a large, simple lighting fixture with a dome-like reflector, large high-wattage lamp and no lens.
The resulting beam of light is wide and soft-edged, creating soft shadows, and is commonly used for back light, top light, and side light. Another method of controlling the spread of light is to use either a top hat (also referred to as a snoot), which generally limits the light coming out, or a barn door , whose flaps work as though they were ...
Thermoacoustics is the interaction between temperature, density and pressure variations of acoustic waves. Thermoacoustic heat engines can readily be driven using solar energy or waste heat and they can be controlled using proportional control.
The company’s "VTAC" ("Vietnam Tactical Tomahawk") is in use by the US Army Stryker Brigade in Afghanistan, the 172nd SBCT Team based at Grafenwoehr, GE, the 3rd Brigade, 2nd Infantry Division out of Fort Lewis, a Recon Platoon in the 2-183d CAV (116th IBCT)(OIF 2007-2008) and numerous other soldiers.
VTAC may mean: Victorian Tertiary Admissions Centre; Vietnam Tactical Tomahawk; VTAC, vertical design of a packaged terminal air conditioner (PTAC). See also.
The Solar Bottle Bulb, as it has also been called, [7] is installed in the roof of homes with the purpose of refracting sunlight in order to light up a room. The project's innovation lies in its utilization of cheap, durable and readily available materials to produce high quality natural lighting enabling the urban poor to have access to an ...