Jet engine - Jet engine A jet engine is a type of air-breathing engine, often used on aircraft. The principle of all jet engines is the same. Air is drawn in at the front and compressed. Fuel is then added and the resulting mixture burned. The combustion greatly increases the pressure of the gases which are then exhausted out of the rear of the engine. The process can be seen to be the same as a normal four stroke cycle, but with the processes - induction, compression, ignition and exhaust - taking place continuously. The engine generates thrust because of the acceleration of the air through it - the equal and opposite force this acceleration produces (Newton's third law) is thrust. A jet engine takes a relatively small mass.
Jet sprint boat racing - Jet sprint boat racing Jet Sprint Boat racing is a form of racing sport where trailerable speed boats, powered by water jet propulsion rather than by conventional propellers, race around shallow, artificial watercourses characterised by many tight turns. The racing format is usually a sequence of time trials. While the Jetboat was invented in New Zealand, this form of boat racing is becoming more popular in Australasia, and attracts large crowds to events. see also sport, Offshore Powerboat racing.
Jet Li - Jet Li Jet Li, 李連杰 Gwohngdongwa pengyam: Ley5 Lin4 Git6 pinyin Li3 lian2 jie2, (born April 26 1963) is a martial artist and actor. He won the Chinese Wushu national championship five times, which eventually lead to a career as a martial arts movie star, first in mainland China, then in Hong Kong and now in Hollywood. He has made many movies in Hong Kong over the years. His début in Hollywood was in Lethal Weapon 4 as a villain. His first leading role in a Hollywood movie was in Romeo must die. After that came Kiss of the dragon, The One premièred in North America on November 2, 2001, and his latest movie Cradle 2 the Grave premièred in North America on February 28, 2003..
Jet Propulsion Laboratory - Jet Propulsion Laboratory The Caltech Jet Propulsion Laboratory (JPL) near Pasadena, California builds and operates unmanned spacecraft for NASA. JPL-run projects include the Galileo Jupiter mission and the Mars rovers, including the 1997 Mars Pathfinder and the twin 2003 Mars Exploration Rovers. Over the years, JPL has sent unmanned missions to every planet, except Pluto. In addition, JPL has also done extensive mapping missions of the Earth. JPL also manages the world-wide Deep Space Network, with facilities in California's Mojave Desert, near Madrid, Spain, and near Canberra, Australia. The 177-acre JPL campus is actually located in the city of La Canada Flintridge, California, but JPL maintains a Pasadena address (4800 Oak Grove Drive, Pasadena, CA 91109), for simplicity's sake. There are approximately 5,000 full-time employees, and.
Jet stream - Jet stream Jet streams are fast flowing, confined air currents found in the atmosphere at around 12 km above the surface of the Earth (just under the tropopause). They form at the boundaries of adjacent air masses with significant differences in temperature, such as of the polar region and the warmer air to the south (the meridional temperature gradient). Because of the effect of the Earth's rotation the streams flow west to east, propagating in a serpentine or wave-like manner at lower speeds than that of the actual wind within the flow. There are two main jet streams at polar latitudes, one in each hemisphere, and two lesser streams closer to the equator. In the northern hemisphere the streams are most commonly found between latitude 30°.
Jet - Jet Jet is a geological material that is not considered a mineral in the true sense of the word. It is a hard, compact variety of lignite, coal-black in color. It is easily polished and has been used in the manufacture of cheap ornaments. A jet is a stream of fluid produced by discharge through an orifice into free space. Since gas is a compressible fluid, the velocity attained by a jet of gas cannot be determined by Bernoulli's principle. Instead, if one uses adiabatic expansion from P1 to P2 in a properly shaped nozzle, the ideal velocity of a gas jet is: v = 8×√((RT1/z)×(1-(P2/P1)z)) where R and z are characteristics of the gas, R being the common gas constant and z being (cp-cv)/cp, where.
Jet lag - Jet lag Jet lag (or "jet-lag") is a physical condition caused by crossing multiple time zones during flight. The condition is generally believed to be the result of disruption to the circadian rhythms (ie. the "light/dark" cycle) of the body. It can also be exacerbated by experiencing sudden changes in climate or seasonal conditions, as well as the low humidity commonly experienced in the cabin of an aircraft. Characteristic symptoms of jet lag include: Fatigue Disorientation and/or grogginess Nausea and/or upset stomach Headaches and/or sinus irritation Insomnia and/or highly irregular sleeping patterns Dehydration and loss of appetite Irritability Irrationality The condition is not linked to the length of flight, but to the east-west distance travelled. Hence a ten hour flight between Oslo and Johannesburg will probably.
Jet, Oklahoma - Jet, Oklahoma Jet is a town located in Alfalfa County, Oklahoma. As of the 2000 census, the town had a total population of 230. Geography \nJet is located at 36°40'0" North, 98°10'52" West (36.666790, -98.181053)1. According to the United States Census Bureau, the town has a total area of 0.8 km² (0.3 mi²). 0.8 km² (0.3 mi²) of it is land and none of the area is covered with water. Demographics \nAs of the census of 2000, there are 230 people, 115 households, and 71 families residing in the town. The population density is 286.5/km² (746.3/mi²). There are 149 housing units at an average density of 185.6/km² (483.5/mi²). The racial makeup of the town is 96.09% White, 0.00% African American, 1.30% Native American, 0.43% Asian, 0.00%.
Jet aircraft - Jet aircraft Jet aircraft are aircraft with jet engines. Generally, jets fly near the top of the troposphere, just below the stratosphere. The first jetplane was the Heinkel He 178 (Germany), piloted by Erich Warsitz in 1939. The first jet fighter was the Messerschmitt Me 262, piloted by Fritz Wendel. It was the fastest conventional airplane of WW II (the rocket-powered Messerschmitt Me 163 Komet was faster). Mass production started in 1944, too late for a decisive impact. During the Korean War on November 8, 1950, United States Air Force Lt. Russell J. Brown flying in an F-80, intercepted two North Korean MiG-15s near the Yalu River and shot them down in the first jet-to-jet dogfight in history. See also: Commercial aviation.
Jetboat - Jetboat A jetboat is a boat propelled by a jet of water ejected from the back of the craft. Unlike a powerboat or motorboat that uses a propeller in the water behind the boat, a jetboat draws the water from under the boat into an impeller pump, known as a jet unit, inside the boat then expels it through a nozzle at the stern. Steering is accomplished by small vanes that direct the water jet in the direction the boat needs to go. Because of this the jetboat is highly maneuverable and can often be reversed and brought to a stop within its own length from full speed in a maneuver known as a jetboat turn. By analogy to aircraft, a conventional screw propellor accelerates a large volume of water.
Jetliner - Jetliner A jetliner is an airliner powered by jet engines (usually of the turbofan type). Most modern long-distance air travel is conducted with jetliners, although the fleets of many airlines include a number of smaller turboprop aircraft, typically used for shorter flights to provincial towns, island communities, or airports where topography or adjoining development limits the runway length. The Boeing 707, Convair 880, de Havilland Comet, Douglas DC-8, Sud Aviation Caravelle and Tupolev Tu-104 of the 1950s represented the first generation of jetliners and considerable national prestige was attached to developing prototypes and bringing these various designs into service. There was a strong nationalism in purchasing policy, such that the Boeing and Douglas products became closely associated with Pan Am, whilst BOAC ordered Comets, Aeroflot used Tupolevs, and Air France.
JET - JET JET, the Joint European Torus, is a tokamak and is the largest and most powerful nuclear fusion reactor yet built. Situated on an old RAF airfield near Culham, Oxfordshire, in the UK, construction was started in 1978 and the first experiments began in 1983. In 1997 JET achieved 16MW of fusion power; the current world-record. JET was later equipped with remote handling facilities to cope with the radioactivity produced by deuterium-tritium fuel, which is the fuel proposed for the first generation of fusion power plants. Pending construction of ITER, JET remains the only large fusion reactor able to use this fuel mix. JET operated throughout 2003 culminating in experiments using small amounts of tritium. For most of 2004 it will be shutdown for a series.
Jet d'Eau - Jet d'Eau Situated at the point where Lake Geneva empties into the Rhone River, in the heart of Geneva city, Switzerland, lies a powerful water fountain, the Jet d'Eau, or water-jet. The fountain is visible throughout the city and from the air, even when flying over Geneva at 10 km altitude. 500 liters of water per second are jetted to an altitude of 140 metres by two groups of pumps, operating on 500 kW / 2,400 V electricity. The water leaves the nozzle at an amazing speed of 200 km/h. When it is in operation, at any given moment, there are about 2,000 litres of water in the air. The fountain, which operates all day in summer, and at certain daytime hours during the fall and.
JET Programme - JET Programme The Japan Exchange and Teaching Programme. Set up in 1987, this programme employs predominantly young college graduates as native speaker Assistant Language Teachers (ALTs) in Japanese schools, Coordinators for International Relations (CIRs) or Sports Education Advisors (SEAs). The programme is run by three ministries (the Ministry of Public Management, Home Affairs, Posts and Telecommunications, the Ministry of Foreign Affairs, and the Ministry of Education, Culture, Sports, Science and Technology) in conjunction with local authorities. Administration of the programme is done by CLAIR, the Council of Local Authorities for International Relations. As of 2003, roughly 6,000 foreigners were employed in Japan on this programme, making it the world's largest exchange teaching programme. Of that number, about half were from America, with Britain, Canada, Australia and.
Jet ski - Jet ski Jet ski is the brand name of Kawasaki Heavy Industries personal water craft. The name, however, is often used as a generic term for other makes of personal watercraft..
Jet Set Willy - Jet Set Willy Jet Set Willy was a computer game for the ZX Spectrum home computer. It was released during the height of the computer's popularity in the early 1980s. The game is a follow on from Manic Miner and is largely credited with bringing the platform game to the home micro scene. It was published by Software Projects. The game was written by Matthew Smith who was hailed at the time as a a games writing genius but who would eventually vanish, allegedly turning up in a Dutch commune some years later..
Jet force - Jet force A rocket-like force due to Isaac Newton's third law (for every action there is an equal and opposite reaction). The backward moving exaust of a burning fuel pushes a rocket or jet forward. Throwing a brick off the back of a child's wagon also pushes the wagon forward..
Ink jet printer - Ink jet printer Ink jet computer printers are the type of printer most commonly sold to the individual computer user. Ink jet technology was allegedly invented by Hewlett-Packard, whose printer division is still the most profitable division. An ink jet usually works by having a print cartridge with a series of tiny electrically-heated chambers that are constructed by photolithography. To print, the printer runs a pulse of current through the heating elements. A steam explosion in the chamber propels a droplet of ink. The ink's surface tension pumps another charge of ink into the chamber through a narrow channel attached to an ink reservoir. Older ink jet printers directed ink streams electrostatically; ultrasound was used to induce waves in the ink, which then broke into little droplets.
Vertical take-off and landing - easy to move the plane, moving the support equipment and fuel was not so easy. By the mid-1960s interest in VTOL had faded, perhaps due much to the widespread introduction of ICBMs as the main nuclear delivery system. Currently there are believed to be two types of practical VTOL aircraft in operation: Bell Boeing V-22 Osprey "tilt-rotor" and the British Aerospace Hawker Harrier "Jump jet" An early VTOL prototype was the so-called "flying bedstead". The Harrier is often flown in STOVL mode which enables it to carry a higher fuel or weapon load over a given distance. It was developed from the Hawker P.1127 and Kestrel. The United States Marine Corps uses a license-built derivative of the Harrier. NASA has flown other VTOL craft such as the XV-15 research craft, as.
Kansas City International Airport - airport for what is now Kansas City Downtown airport. The downtown airport was very convenient, but was not fit for the jet-age, due to it's short runway and close proximity to the downtown area. In order to accomodate the more demanding jets, the city built the International Airport on the site of the reliever facility, and in 1973, the new airport opened for business. Almost all the airlines that were at the old facility moved to the new airport. This airport served as a hub for the now defunct Eastern Airlines, as well as Braniff Airlines (also out of business). It is still a major airport, but serves more of a role as a "spoke" in the national airline network. At 10,000 acres, it is one of the largest airfields in.
