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Laser Fence
A laser fence or laser wall is a mechanism to detect objects passing the line of sight between the laser source and the detector.http://www.freepatentsonline.com/3825916.html accessed 26 Jan 2011 Stronger lasers can be used to injure entities passing the laser beam. In fiction, laser fences may have the ability to stop intruders by blocking or injuring them. Description A laser fence mechanism detects objects passing the line of sight between a source and |
Laser
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The word "laser" is an acronym for "light amplification by stimulated emission of radiation". The first laser was built in 1960 by Theodore H. Maiman at Hughes Research Laboratories, based on theoretical work by Charles Hard Townes and Arthur Leonard Schawlow. A laser differs from other sources of light in that it emits light which is ''coherent''. Spatial coherence allows a laser to be focused to a tight spot, enabling applications such as laser cutting and lithography. Spatial coherence also allows a laser beam to stay narrow over great distances (collimation), enabling applications such as laser pointers and lidar (light detection and ranging). Lasers can also have high temporal coherence, which allows them to emit light with a very narrow spectrum. Alternatively, temporal coherence can be used to produce ultrashort pulses of ligh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Human Revolution
Human Revolution may refer to: * '' Deus Ex: Human Revolution'', a 2011 video game in the ''Deus Ex'' series * ''The Human Revolution'', a multi-volume novel by Daisaku Ikeda, and adaptations * The Human Revolution (human origins), the sudden emergence of language, consciousness and culture in our species * Human evolution (origins of society and culture), the physical emergence of Homo sapiens as a distinct species * Neolithic Revolution The Neolithic Revolution, or the (First) Agricultural Revolution, was the wide-scale transition of many human cultures during the Neolithic period from a lifestyle of hunting and gathering to one of agriculture and settlement, making an incre ..., the wide-scale transition from hunting and gathering to agriculture * Origins of society, the emergence of distinctively human social organizations {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Force Lasers
In physics, a force is an influence that can change the motion of an object. A force can cause an object with mass to change its velocity (e.g. moving from a state of rest), i.e., to accelerate. Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it a vector quantity. It is measured in the SI unit of newton (N). Force is represented by the symbol (formerly ). The original form of Newton's second law states that the net force acting upon an object is equal to the rate at which its momentum changes with time. If the mass of the object is constant, this law implies that the acceleration of an object is directly proportional to the net force acting on the object, is in the direction of the net force, and is inversely proportional to the mass of the object. Concepts related to force include: thrust, which increases the velocity of an object; drag, which decreases the velocity of an object; and torque, which produces ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fences
A fence is a barrier enclosing or bordering a field, yard, etc., usually made of posts and wire or wood, used to prevent entrance, to confine, or to mark a boundary. Fence or fences may also refer to: Entertainment Music * Fences (band), an American rock band *Fences (song), a song by Blanche * "Fences", a song on Paramore's 2007 album ''Riot!'' * "Fences", a song by Phoenix from the 2009 album ''Wolfgang Amadeus Phoenix'' Other media * ''Fence'' (magazine), an American literary magazine * ''Fences'' (play), a 1983 Pulitzer Prize-winning play by August Wilson ** ''Fences'' (film), a 2016 film adaptation of the play, starring Denzel Washington and Viola Davis, and directed by Washington * ''Fence'' (comic book) * Slitherlink or Fences, a logic puzzle published by Nikoli Places * Fence, Wisconsin, a town in the United States * Fence (community), Wisconsin, an unincorporated community in the United States * Fence, Lancashire, a village in England Science and technology * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lidar
Lidar (, also LIDAR, or LiDAR; sometimes LADAR) is a method for determining ranges (variable distance) by targeting an object or a surface with a laser and measuring the time for the reflected light to return to the receiver. It can also be used to make digital 3-D representations of areas on the Earth's surface and ocean bottom of the intertidal and near coastal zone by varying the wavelength of light. It has terrestrial, airborne, and mobile applications. ''Lidar'' is an acronym of "light detection and ranging" or "laser imaging, detection, and ranging". It is sometimes called 3-D laser scanning, a special combination of 3-D scanning and laser scanning. Lidar is commonly used to make high-resolution maps, with applications in surveying, geodesy, geomatics, archaeology, geography, geology, geomorphology, seismology, forestry, atmospheric physics, laser guidance, airborne laser swath mapping (ALSM), and laser altimetry. It is also used in control and navigation for som ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Laser Doppler Velocimetry
Laser Doppler velocimetry, also known as laser Doppler anemometry, is the technique of using the Doppler shift in a laser beam to measure the velocity in transparent or semi-transparent fluid flows or the linear or vibratory motion of opaque, reflecting surfaces. The measurement with laser Doppler anemometry is absolute and linear with velocity and requires no pre-calibration. Technology origin The development of the helium–neon laser (He-Ne) in 1962 at the Bell Telephone Laboratories provided the optics community with a continuous wave electromagnetic radiation source that was highly concentrated at a wavelength of 632.8 nanometers (nm) in the red portion of the visible spectrum. It was discovered that fluid flow measurements could be made using the Doppler effect on a He-Ne beam scattered by small polystyrene spheres in the fluid. At the Research Laboratories of Brown Engineering Company (later Teledyne Brown Engineering), this phenomenon was used to develop the first laser ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Defense
Defense or defence may refer to: Tactical, martial, and political acts or groups * Defense (military), forces primarily intended for warfare * Civil defense, the organizing of civilians to deal with enemy attacks * Defense industry, industry which manufactures and sells weapons and military technology * Self-defense, the use of force to defend oneself * Haganah (Hebrew for "The Defence"), a paramilitary organization in British Palestine * National security, security of a nation state, its citizens, economy, and institutions, as a duty of government ** Defence diplomacy, pursuit of foreign policy objectives through the peaceful employment of defence resources ** Ministry of defence or department of defense, a part of government which regulates the armed forces ** Defence minister, a cabinet position in charge of a ministry of defense * International security, measures taken by states and international organizations to ensure mutual survival and safety Sports * Defense (sport ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Titanfall 2
''Titanfall 2'' is a first-person shooter video game, developed by Respawn Entertainment and published by Electronic Arts. A sequel to 2014's '' Titanfall'', the game was released worldwide on October 28, 2016, for PlayStation 4, Windows, and Xbox One. In ''Titanfall 2'', players control Titans, mecha-style exoskeletons and their pilots, who are agile and equipped with a variety of skills ranging from wall-running to cloaking. Set in a science fiction universe, the single-player campaign follows the story of Jack Cooper, a rifleman from the Frontier Militia, who bonds with his mentor's Titan BT-7274 after his mentor is killed in action. Together, they embark on a quest to stop the Interstellar Manufacturing Corporation (IMC) from launching a superweapon that is threatening to destroy the Militia planet Harmony. The game's two-year development cycle began in mid-2014. The decision to add a single-player campaign to the game came about because the team wanted to expand the game ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thieves In Time
Theft is the act of taking another person's property or services without that person's permission or consent with the intent to deprive the rightful owner of it. The word ''theft'' is also used as a synonym or informal shorthand term for some crimes against property, such as larceny, robbery, embezzlement, extortion, blackmail, or receiving stolen property. In some jurisdictions, ''theft'' is considered to be synonymous with '' larceny'', while in others, ''theft'' is defined more narrowly. Someone who carries out an act of theft may be described as a "thief" ( : thieves). ''Theft'' is the name of a statutory offence in California, Canada, England and Wales, Hong Kong, Northern Ireland, the Republic of Ireland, and the Australian states of South Australia Theft (and receiving). and Victoria. Theft. Elements The ''actus reus'' of theft is usually defined as an unauthorized taking, keeping, or using of another's property which must be accompanied by a ''mens rea'' of dis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Portal 2
''Portal 2'' is a 2011 puzzle-platform video game developed by Valve Corporation, Valve for Windows, Mac OS X, Linux, PlayStation 3, and Xbox 360. The digital PC version is distributed online by Valve's Steam (service), Steam service, while all retail editions were distributed by Electronic Arts. A port for the Nintendo Switch was included as part of ''Portal: Companion Collection''. Like the original ''Portal (video game), Portal'' (2007), players solve puzzles by placing portals and teleporting between them. ''Portal 2'' adds features including tractor beams, lasers, light bridges, and paint-like gels that alter player movement or allow portals to be placed on any surface. In the single-player campaign, players control Chell (Portal), Chell, who navigates the dilapidated Aperture Science Laboratories, Aperture Science Enrichment Center during its reconstruction by the supercomputer GLaDOS (Ellen McLain); new characters include robot Wheatley (Portal), Wheatley (Stephen Mercha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
What's Yours Is Mine
What or WHAT may refer to: * What, an interrogative pronoun and adverb * "What?", one of the Five Ws used in journalism Film and television * ''What!'' (film) or ''The Whip and the Body'', a 1963 Italian film directed by Mario Bava * '' What?'' (film), a 1972 film directed by Roman Polanski * "What", the name of the second baseman in Abbott and Costello's comedy routine " Who's on First?" * "What?", the catchphrase of professional wrestler Stone Cold Steve Austin Music * ''what.'', a comedy/music album by Bo Burnham, 2013 * What Records, a UK record label * What? Records, a US record label Songs * "What" (song), by Melinda Marx, 1965 * "What?" (Rob Zombie song), 2009 * "What?" (SB19 song), 2021 * "What?", by 666 from '' The Soft Boys'' * "What", by Bassnectar from ''Vava Voom'' * "What?", by Corrosion of Conformity from ''Eye for an Eye'' * "What?", by the Move from ''Looking On'' * "What?", by A Tribe Called Quest from '' The Low-End Theory'' Science and technology ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Force Field (fiction)
In speculative fiction, a force field, sometimes known as an energy shield, force shield, energy bubble or deflector shield, is a barrier made of things like energy, negative energy, dark energy, electromagnetic fields, gravitational fields, electric fields, quantum fields, plasma, particles, radiation, solid light, or pure force. It protects a person, area, or object from attacks or intrusions or even deflects energy attacks back at the attacker. This fictional technology is created as a field of energy without mass that acts as a wall, so that objects affected by the particular force relating to the field are unable to pass through the field and reach the other side, are deflected or destroyed. Actual research in the 21st century has looked into the potential to deflect radiation or cosmic rays, but also more extensive shielding. This concept has become a staple of many science-fiction works, so much so that authors frequently do not even bother to explain or justify them to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
