|
Scotchlite
Retroreflective sheeting is flexible retroreflective material primarily used to increase the nighttime conspicuity of traffic signs, high-visibility clothing, and other items so they are safely and effectively visible in the light of an approaching driver's headlamps. They are also used as a material to increase the scanning range of barcodes in factory settings. The sheeting consists of retroreflective glass beads, microprisms, or encapsulated lenses sealed onto a fabric or plastic substrate. Many different colors and degrees of reflection intensity are provided by numerous manufacturers for various applications. As with any retroreflector, sheeting glows brightly when there is a small angle between the observer's eye and the light source directed toward the sheeting, but appears nonreflective when viewed from other directions. Applications Retroreflective sheeting is widely used in a variety of applications today, after early widespread use on road signs in the 1960s. High ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lightsaber
A lightsaber is a fictional energy sword featured throughout the ''Star Wars'' franchise. A typical lightsaber is depicted as a luminescent plasma blade about in length emitted from a metal hilt around in length. First introduced in the original ''Star Wars'' film, it has since appeared in most ''Star Wars'' films, with at least one lightsaber duel occurring in each installment of the "Skywalker saga". The lightsaber's distinct appearance was created using rotoscoping for the original films, and with digital effects for the prequel and sequel trilogies. In the ''Star Wars'' universe, the lightsaber is the signature weapon of the light side-wielding Jedi Order and the dark side-wielding Sith Order and the Knights of Ren. However, the lightsaber can also be wielded by non-Force-sensitive characters as an ordinary weapon or tool. The Jedi use different colored lightsabers (predominantly blue and green, though purple and yellow have also appeared in canon media), while t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Front Projection Effect
A front projection effect is an in-camera visual effects process in film production for combining foreground performance with pre-filmed background footage. In contrast to rear projection, which projects footage onto a screen from behind the performers, front projection projects the pre-filmed material over the performers and onto a highly reflective background surface. Description In contrast to rear projection, in front projection the background image is projected onto both the performer and a highly reflective background screen, with the result that the projected image is bounced off the screen and into the lens of a camera. This is achieved by having a screen made of a retroreflective material such as Scotchlite, a product of the 3M company that is also used to make screens for movie theaters. Such material is made from millions of glass beads affixed to the surface of the cloth. These glass beads reflect light back only in the direction from which it came, far more eff ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ASTM
ASTM International, formerly known as American Society for Testing and Materials, is an international standards organization that develops and publishes voluntary consensus technical standards for a wide range of materials, products, systems, and services. Some 12,575 ASTM voluntary consensus standards operate globally. The organization's headquarters is in West Conshohocken, Pennsylvania, about northwest of Philadelphia. It is founded in 1902 as the American Section of the International Association for Testing Materials (see also International Organization for Standardization). History A group of scientists and engineers, led by Charles Dudley, formed ASTM in 1898 to address the frequent rail breaks affecting the fast-growing railroad industry. The group developed a standard for the steel used to fabricate rails. Originally called the "American Society for Testing Materials" in 1902, it became the "American Society for Testing And Materials" in 1961. In 2001, ASTM official ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hyperloop
A hyperloop is a proposed high-speed transportion system for both public and goods transport. The idea was picked up by Elon Musk to describe a modern project based on the vactrain concept (first appearance in 1799). Hyperloop systems comprise three essential elements: tubes, pods, and terminals. The tube is a large, sealed and low-pressure system (usually a long tunnel). The pod is a coach pressurized at atmospheric pressure that runs substantially free of air resistance or friction inside this tube using magnetic propulsion (in some cases augmented by a ducted fan). The terminal handles pod arrivals and departures. The Hyperloop, in the initial form proposed by Musk, differs from vactrains by relying on residual air pressure inside the tube to provide lift by aerofoils and propulsion by fans. The hyperloop has its roots in a concept by George Medhurst in 1799 and subsequently developed under the names pneumatic railway, atmospheric railway or vactrain. Elon Musk renewed in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Navigation
Navigation is a field of study that focuses on the process of monitoring and controlling the movement of a craft or vehicle from one place to another.Bowditch, 2003:799. The field of navigation includes four general categories: land navigation, marine navigation, aeronautic navigation, and space navigation. It is also the term of art used for the specialized knowledge used by navigators to perform navigation tasks. All navigational techniques involve locating the navigator's position compared to known locations or patterns. Navigation, in a broader sense, can refer to any skill or study that involves the determination of position and direction. In this sense, navigation includes orienteering and pedestrian navigation. History In the European medieval period, navigation was considered part of the set of '' seven mechanical arts'', none of which were used for long voyages across open ocean. Polynesian navigation is probably the earliest form of open-ocean navigation; it was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Autonomous Vehicles
Vehicular automation involves the use of mechatronics, artificial intelligence, and multi-agent systems to assist the operator of a vehicle (car, aircraft, watercraft, or otherwise).Hu, J.; Bhowmick, P.; Lanzon, A.,Group Coordinated Control of Networked Mobile Robots with Applications to Object Transportation IEEE Transactions on Vehicular Technology, 2021.Hu, J.; Bhowmick, P.; Jang, I.; Arvin, F.; Lanzon, A.,A Decentralized Cluster Formation Containment Framework for Multirobot Systems IEEE Transactions on Robotics, 2021. These features and the vehicles employing them may be labeled as ''intelligent'' or ''smart''. A vehicle using automation for difficult tasks, especially navigation, to ease but not entirely replace human input, may be referred to as ''semi-autonomous'', whereas a vehicle relying solely on automation is called robotic or autonomous. Both of these types are instantiated in today's various self-driving cars, unmanned surface vehicles, autonomous trains, advan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Optical
Optics is the branch of physics that studies the behaviour and properties of light, including its interactions with matter and the construction of instruments that use or detect it. Optics usually describes the behaviour of visible, ultraviolet, and infrared light. Because light is an electromagnetic wave, other forms of electromagnetic radiation such as X-rays, microwaves, and radio waves exhibit similar properties. Most optical phenomena can be accounted for by using the classical electromagnetic description of light. Complete electromagnetic descriptions of light are, however, often difficult to apply in practice. Practical optics is usually done using simplified models. The most common of these, geometric optics, treats light as a collection of rays that travel in straight lines and bend when they pass through or reflect from surfaces. Physical optics is a more comprehensive model of light, which includes wave effects such as diffraction and interference that cannot be ac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Star Wars (film)
''Star Wars'' (retroactively titled ''Star Wars: Episode IV – A New Hope'') is a 1977 American epic space opera film written and directed by George Lucas, produced by Lucasfilm and distributed by 20th Century Fox. It is the first film in the '' Star Wars'' film series and fourth chronological chapter of the " Skywalker Saga". Set "a long time ago" in a fictional universe where the galaxy is ruled by the tyrannical Galactic Empire, the story focuses on a group of freedom fighters known as the Rebel Alliance, who aim to destroy the Empire's newest weapon, the Death Star. Luke Skywalker becomes caught in the conflict while learning the ways of a metaphysical power known as "the Force" from Jedi Master Obi-Wan Kenobi. The cast includes Mark Hamill, Harrison Ford, Carrie Fisher, Peter Cushing, Alec Guinness, David Prowse, James Earl Jones, Anthony Daniels, Kenny Baker, and Peter Mayhew. Lucas had the idea for a science-fiction film in the vein of '' Flash Gordon'' aro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Superman (1978 Film)
''Superman'' (stylized as ''Superman: The Movie'') is a 1978 superhero film based on the character by DC Comics. An international co-production between the United Kingdom, Switzerland, Panama and the United States, it was supervised by Alexander and Ilya Salkind, produced by their partner Pierre Spengler and written by Mario Puzo from a story by Puzo, and is the first installment in the Superman film series. Directed by Richard Donner, the film features an ensemble cast including Marlon Brando, Gene Hackman, Christopher Reeve, Jeff East, Margot Kidder, Glenn Ford, Phyllis Thaxter, Jackie Cooper, Trevor Howard, Marc McClure, Terence Stamp, Valerie Perrine, Ned Beatty, Jack O'Halloran, Maria Schell, and Sarah Douglas. It depicts the origin of Superman (Reeve), including his infancy as Kal-El of Krypton, son of Jor-El (Brando) and his youthful years in the rural town of Smallville. Disguised as reporter Clark Kent, he adopts a mild-mannered disposition in Metropolis and d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Where Eagles Dare
''Where Eagles Dare'' is a 1968 war film directed by Brian G. Hutton and starring Richard Burton, Clint Eastwood and Mary Ure. It follows a joint British-American Special Operations Executive team of paratroopers raiding a castle (shot on location in Austria and Bavaria). It was filmed in Panavision using the Metrocolor process, and was distributed by Metro-Goldwyn-Mayer. Alistair MacLean wrote the screenplay, his first, at the same time that he wrote the novel of the same name. Both became commercial successes. The film involved some of the top filmmakers of the day and is considered a classic. Hollywood stuntman Yakima Canutt was the second unit director and shot most of the action scenes; British stuntman Alf Joint doubled for Burton in many sequences, including the fight on top of the cable car; award-winning conductor and composer Ron Goodwin wrote the film score; and future Oscar-nominee Arthur Ibbetson worked on the cinematography. Plot In the winter of 1943–4 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
