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Vortex Ring Toy
An air vortex cannon is a toy that releases doughnut-shaped air vortices — similar to smoke rings but larger, stronger and invisible. The vortices are able to ruffle hair, disturb papers or blow out candles after travelling several metres. The design consists of a short and broad barrel with a slight taper, closed by a flexible diaphragm at the larger end. The diaphragm is internally attached to the barrel by elastic strips. The cannon is "armed" by pulling the diaphragm out, distending the elastic bands, and is "fired" by releasing the diaphragm. The diaphragm quickly pushes a quantity of air out of the open end, creating a vortex ring. An air vortex cannon can be made easily at home, from just a cardboard box.The Vortex Cannon - Student Science at YouTube. Accessed February 2013. A toy commercial version, w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Airzooka
An air vortex cannon is a toy that releases doughnut-shaped air vortices — similar to smoke rings but larger, stronger and invisible. The vortices are able to ruffle hair, disturb papers or blow out candles after travelling several metres. The design consists of a short and broad barrel with a slight taper, closed by a flexible diaphragm at the larger end. The diaphragm is internally attached to the barrel by elastic strips. The cannon is "armed" by pulling the diaphragm out, distending the elastic bands, and is "fired" by releasing the diaphragm. The diaphragm quickly pushes a quantity of air out of the open end, creating a vortex ring. An air vortex cannon can be made easily at home, from just a cardboard box.The Vortex Cannon - Student Science at YouTube. Accessed February 2013. A toy commercial version, wi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wham-O
Wham-O Inc. is an American toy company based in Carson, California, United States. It is known for creating and marketing many popular toys for nearly 70 years, including the Hula hoop, Frisbee, Slip 'N Slide, Super Ball, Trac-Ball, Silly String, Hacky sack, Wham-O Bird Ornithopter and Boogie Board, many of which have become genericized trademarks. Corporate history Richard Knerr (1925–2008) and Arthur "Spud" Melin (1924–2002), two University of Southern California graduates who were friends since their teens, were unhappy with their jobs and decided to start their own business. In 1948 they formed the WHAM-O Manufacturing Company in the Knerr family garage in South Pasadena. Their first product was the Wham-O Slingshot, made of ash wood, which Knerr and Melin promoted by holding demonstrations of their own slingshot skills. The name "Wham-O" was inspired by the sound of the slingshot's shot hitting the target. The powerful slingshot was adopted by clubs for competit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Radio Nottingham
University Radio Nottingham is the university radio station of the University of Nottingham, England, where it is part of the Students' Union. During term-time it broadcasts locally on University Park Campus on 1350 AM and worldwide via its website. It is a multi-award winning station run by the student volunteers from the University of Nottingham. History URN was established from the University's Radio Broadcasting Club, who, in the late 1970s had an hour's slot on BBC Radio Nottingham. The station set up its first studio in the Cherry Tree buildings in 1978 and "University Radio Nottingham" started broadcasting to Hugh Stewart Hall and Cripps Hall of residence on 963 kHz (312m) in November 1979. Additional induction loops were set up over the next few years in other halls on campus. A fifth induction loop was installed on Sutton Bonington Campus in 1990, financed by their Guild. In 1997, URN became one of the first radio stations to broadcast on the internet using th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vortex Ring Gun
The vortex ring gun is an experimental non-lethal weapon for crowd control that uses high-energy vortex rings of gas to knock down people or spray them with marking ink or other chemicals. The concept was explored by the US Army starting in 1998, and by some commercial firms. Knockdown of distant individuals currently seems unlikely even if the rings are launched at theoretical maximum speed. As for the delivery of chemicals, leakage during flight is still a problem. Weapons based on similar principles but different designs and purposes have been described before, typically using acetylene-air or hydrogen–oxygen explosions to create and propel the vortices. Operation In a typical concept, a blank cartridge is fired into a gun barrel that has a diverging nozzle screwed onto the muzzle. In the nozzle, the short pulse of high pressure gas briefly accelerates to a supersonic exit velocity, whereupon a portion of the exhaust transforms from axial flow into a subsonic, high ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bubble Ring
A bubble ring, or toroidal bubble, is an underwater vortex ring where an air bubble occupies the core of the vortex, forming a ring shape. The ring of air as well as the nearby water spins poloidally as it travels through the water, much like a flexible bracelet might spin when it is rolled on to a person's arm. The faster the bubble ring spins, the more stable it becomes. The physics of vortex rings are still under active study in fluid dynamics. Devices have been invented which generate bubble vortex rings. Physics As the bubble ring rises, a lift force pointing downward that is generated by the vorticity acts on the bubble in order to counteract the buoyancy force. This reduces the bubble's velocity and increases its diameter. The ring becomes thinner, despite the total volume inside the bubble increasing as the external water pressure decreases. Bubble rings fragment into rings of spherical bubbles when the ring becomes thinner than a few millimetres. This is due to Platea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Česká Televize
Czech Television ( cs, Česká televize, italics=no ; abbreviation: ČT) is a public television broadcaster in the Czech Republic, broadcasting seven channels. Established after the Velvet Revolution in 1992, it is the successor to Czechoslovak Television founded in 1953. History 1953–1992: Czechoslovak Television Founded on 1 May 1953, Czechoslovak Television (ČST) was the state television broadcaster of Czechoslovakia used as a state propaganda medium of the then socialist state. It was known by three names over its lifetime: cs, Československá televize, sk, Československá televízia (until 1990) and (from 1990 until 1992). ČST originally consisted of a single channel and limited experimental broadcasting in 1953. Regular broadcasts began on 25 February 1954 and on 10 May 1970, a second channel was launched. The broadcast language of ČST was predominantly Czech in the first channel, Slovak for selected programming, and both for news. The second channel was sp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Minnesota
The University of Minnesota, formally the University of Minnesota, Twin Cities, (UMN Twin Cities, the U of M, or Minnesota) is a public land-grant research university in the Twin Cities of Minneapolis and Saint Paul, Minnesota, United States. The Twin Cities campus comprises locations in Minneapolis and Falcon Heights, a suburb of St. Paul, approximately apart. The Twin Cities campus is the oldest and largest in the University of Minnesota system and has the ninth-largest main campus student body in the United States, with 52,376 students at the start of the 2021–22 academic year. It is the flagship institution of the University of Minnesota System, and is organized into 19 colleges, schools, and other major academic units. The Minnesota Territorial Legislature drafted a charter for the U of M as a territorial university in 1851, seven years before Minnesota became a state. Today, the university is classified among "R1: Doctoral Universities – Very high research acti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bungee Cord
Bungee cords equipped with metal hooks A bungee cord (sometimes spelled bungle; also known as a shock cord) is an elastic cord composed of one or more elastic strands forming a core, usually covered in a woven cotton or polypropylene sheath. The sheath does not materially extend elastically, but it is braided with its strands spiralling around the core so that a longitudinal pull causes it to squeeze the core, transmitting the core's elastic compression to the longitudinal extension of the sheath and cord. Specialized bungees, such as some used in bungee jumping, may be made entirely of elastic strands. Uses upA child on a bungee cord device in Moscow, Russia Bungee cords have been used to provide a lightweight suspension for aircraft undercarriages from before World War I, and are still used on many small homebuilt aircraft where weight remains critical. Bungee cords were also used in parachuting to assist in opening the old-style parachute container after the ripcord was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brian S
Brian (sometimes spelled Bryan in English) is a male given name of Irish and Breton origin, as well as a surname of Occitan origin. It is common in the English-speaking world. It is possible that the name is derived from an Old Celtic word meaning "high" or "noble". For example, the element ''bre'' means "hill"; which could be transferred to mean "eminence" or "exalted one". The name is quite popular in Ireland, on account of Brian Boru, a 10th-century High King of Ireland. The name was also quite popular in East Anglia during the Middle Ages. This is because the name was introduced to England by Bretons following the Norman Conquest. Bretons also settled in Ireland along with the Normans in the 12th century, and 'their' name was mingled with the 'Irish' version. Also, in the north-west of England, the 'Irish' name was introduced by Scandinavian settlers from Ireland. Within the Gaelic speaking areas of Scotland, the name was at first only used by professional families of Irish ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Giant Smoke Ring
In folklore, giants (from Ancient Greek: ''gigas'', cognate giga-) are beings of human-like appearance, but are at times prodigious in size and strength or bear an otherwise notable appearance. The word ''giant'' is first attested in 1297 from Robert of Gloucester's chronicle. It is derived from the ''Gigantes'' ( grc-gre, Γίγαντες) of Greek mythology. Fairy tales such as ''Jack the Giant Killer'' have formed the modern perception of giants as dimwitted ogres, sometimes said to eat humans, while other giants tend to eat the livestock. The antagonist in ''Jack and the Beanstalk'' is often described as a giant. In some more recent portrayals, like those of Jonathan Swift and Roald Dahl, some giants are both intelligent and friendly. Literary and cultural analysis Giants appear in the folklore of cultures worldwide as they represent a relatively simple concept. Representing the human body enlarged to the point of being monstrous, giants evoke terror and remind humans of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Universal Parks & Resorts
Universal Parks & Resorts, also known as Universal Studios Theme Parks or solely Universal Theme Parks, is the theme park unit of NBCUniversal, a subsidiary of Comcast. The company, headquartered in Orlando, Florida, operates Universal theme parks and resort properties around the world. Universal Parks & Resorts is best known for attractions and lands based on famous classic and modern pop culture properties (movies, television, literature, cartoons, comics, video games, music, etc.) from not only NBCUniversal, but also third-party companies, for all of its parks. It started as a touring attraction in the 1910s at the Universal Studios Lot in Universal City near Los Angeles, California, and in 1964 turned into a Universal Studios Hollywood theme park destination, where guests can look behind the scenes of motion pictures and television programs, produced by Universal Pictures and occasionally others, and ride the attraction based on the world's favorite feature films and telev ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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