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Skyguard is a chemical laser -based area defense system proposed by Northrop Grumman, to protect airports and other areas against a variety of military threats including short-range ballistic missiles, short- and long-range rockets, artillery shells, mortars, unmanned aerial vehicles and cruise missiles. Each shot costs about $1,000 which ...
v. t. e. In economics, a price system is a system through which the valuations of any forms of property (tangible or intangible) are determined. All societies use price systems in the allocation and exchange of resources as a consequence of scarcity. [1] Even in a barter system with no money, price systems are still utilized in the ...
The Philadelphia Industrial Correction Center (PICC) opened in 1986 holds approximately 900 medium custody adult male inmates. It was the first PDP facility constructed to operate on the basis of unit management. PICC's is split into 13 housing units arranged around separate yards, laundry facilities, medical triage areas, counseling rooms, and ...
Electricity price area. An electricity price area is a zone throughout which the electricity is traded at the same spot price on a power exchange. An electricity price area is decided by transmission system operator and can be a whole country, or parts of it. [1]
Ring laser gyroscope. A ring laser gyroscope ( RLG) consists of a ring laser having two independent counter-propagating resonant modes over the same path; the difference in phase is used to detect rotation. It operates on the principle of the Sagnac effect which shifts the nulls of the internal standing wave pattern in response to angular rotation.
Laser-ultrasonics uses lasers to generate and detect ultrasonic waves. [1] It is a non-contact technique used to measure materials thickness, detect flaws and carry out materials characterization. The basic components of a laser-ultrasonic system are a generation laser, a detection laser and a detector.
A Schmidt–Pechan prism is a type of optical prism used to rotate an image by 180°. These prisms are commonly used in binoculars as an image erecting system. The Schmidt–Pechan prism makes use of a roof prism section (from the German: "Dachkante", lit. roof edge ). Binoculars designs using Schmidt–Pechan prisms can be constructed more ...
Refractive surgery. Refractive surgery is optional eye surgery used to improve the refractive state of the eye and decrease or eliminate dependency on glasses or contact lenses. This can include various methods of surgical remodeling of the cornea ( keratomileusis ), lens implantation or lens replacement.