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Defense Advanced Research Projects Agency

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ALSO CALLED: Advanced Research Projects Agency, DARPA, ARPA
DEFINITION:  A cloak of invisibility is a method of rendering physical objects undetectable or invisible. Researchers from the United States and England have developed a prototype for a cloaking device that can hide an object approximately 30 centimeters (1 foot ) in diameter. The device works by producing a mirage, in a manner similar to the way a layer of heated air causes reflection or refraction of light to  … 
Definition continues below.
Defense Advanced Research Projects AgencyMultimedia (View All Report Types)
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WEBCAST: Learn how USB devices are used to transfer data, the federal government’s ban on USB devices and its impact, and how to effectively manage USB devices to secure data and networks without impacting productivity.
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Lumension
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DEFENSE ADVANCED RESEARCH PROJECTS AGENCY DEFINITION (continued): …  create an illusion that can conceal objects on the earth's surface when viewed from a distance at a grazing angle.In the microwave portion of the radio-frequency (RF) spectrum, where most radar systems operate, cloaking differs from stealth technology. A stealth aircraft evades radar detection by presenting a minimal profile for reflecting microwave electromagnetic fields. Cloaking actually diverts electromagnetic waves around the object. This can completely eliminate its image at a specific wavelength. At visible-light wavelengths, such a process may cause distortion of images directly behind … 
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