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Turning Radius
The turning radius (alternatively, turning diameter or turning circle) of a vehicle defines the minimum dimension (typically the radius or diameter) of available space required for that vehicle to make a semi-circular U-turn without skidding. The Oxford English Dictionary describes turning circle as "the smallest circle within which a ship, motor vehicle, etc., can be turned round completely". The term thus refers to a theoretical minimal circle in which for example an aeroplane, a ground vehicle or a watercraft can be turned around. The terms (''radius'', ''diameter'', or ''circle'') can have different meanings; refer to the section. Definition On wheeled vehicles with the common type of front wheel steering (i.e. one, two or even four wheels at the front capable of steering), the vehicle's ''turning diameter'' measures the minimum space needed to turn the vehicle around while the steering is set to its maximum displacement from the central 'straight ahead' position - i.e. ei ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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U-turn
A U-turn in driving refers to performing a 180° rotation to reverse the direction of travel. It is called a "U-turn" because the maneuver looks like the U, letter U. In some areas, the maneuver is illegal, while in others, it is treated as a more ordinary turn, merely extended. In still other areas, lanes are occasionally marked "U-turn permitted" or even "U-turn only." Occasionally, on a divided highway, special U-turn ramps exist to allow traffic to make a U-turn, though often their use is restricted to emergency and police vehicles only. In the United States, U-turn regulations vary by state: in Indiana U-turns are allowed as long as the driver follows all of the precautions normally ascribed to making a left turn (yielding right-of-way (traffic), right-of-way, etc.). Many places, including Texas and Georgia, have specially designed U-turn lanes (referred to as Texas U-turn lanes). In Michigan, U-turns are required for many left turns to and from divided highways, as par ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Swept Path Analysis
Sweep or swept may refer to: Cleaning * Sweep, the action of using a brush to clean * Chimney sweep, a worker who clears ash and soot from chimneys * Street sweeper, a person's occupation, or a machine that cleans streets * Swept quartz, a cleaning of quartz crystal from alkali metal ions Arts, entertainment, and media * ''Sweep'' (book series), a fictional series by Cate Tiernan * Sweep (puppet), a character on the British children's television series ''The Sooty Show'' * Sweep, an ability keyword in '' Magic: The Gathering'' * Sweep-picking, a guitar technique * Sweeps period, a system of calculating viewership for television programming * ''Swept'' (album), a 1991 album by the English singer Julia Fordham * "Swept", a 1986 song by Spandau Ballet from the album ''Through the Barricades'' Detection * Bug sweeping, the common name for electronic counter surveillance * Minesweeper (ship), a small naval ship designed to engage in minesweeping * Minesweeping, the practice ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Three-point Turn
The three-point turn (sometimes called a Y-turn, K-turn, or broken U-turn) is the standard method of turning a vehicle around to face the opposite direction in a limited space, using forward and reverse gears. This is typically done when the road is too narrow for a U-turn, and there are no driveways or sideroads that are conducive to a two-point turn. Three-point turns are dangerous because they make the driver vulnerable to oncoming traffic for an extended period of time. For this reason, they are generally recommended to be used only as a last resort. This manoeuvre is a common requirement in driving tests. Process The basic manoeuvre consists of driving across the road turning towards the offside kerb, reversing across the road to the original nearside kerb while turning, and driving forward towards the original offside kerb, now the nearside. In a narrow road or with a longer vehicle, more than three legs may be required to achieve a full 180 degree rotation. Naming ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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J-turn
A J-turn is a driving maneuver in which a reversing vehicle is spun 180 degrees and continues, facing forward, without changing direction of travel. The J-turn is also called a " moonshiner's turn" (from the evasive driving tactics used by bootleggers), a "reverse 180", a reverse flick, a "Rockford Turn", a "Rockford Spin", or simply a "Rockford" popularized by the 1970s TV show ''The Rockford Files''. A J-turn differs from a bootleg turn in that the vehicle begins in reverse gear. It is often performed by stunt drivers in film and television shows. It can be performed both on dry and snowy surfaces; the latter is preferable while learning the skill. Technique The turn is achieved by transferring the momentum of the car by reversing quickly in a straight line then turning the wheel sharply while using a brake to lock the front wheels. The driver changes into a forward gear as the nose comes about. World record The narrowest J-turn was performed in a Renault Twingo, between b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Synchronization
Synchronization is the coordination of events to operate a system in unison. For example, the Conductor (music), conductor of an orchestra keeps the orchestra synchronized or ''in time''. Systems that operate with all parts in synchrony are said to be synchronous or ''in sync''—and those that are not are ''Asynchronous system, asynchronous''. Today, time synchronization can occur between systems around the world through satellite navigation signals and other time and frequency transfer techniques. Navigation and railways Time-keeping and synchronization of clocks is a critical problem in long-distance ocean navigation. Before radio navigation and Radionavigation-satellite service, satellite-based navigation, navigators required accurate time in conjunction with astronomical observations to determine History of longitude, how far east or west their vessel traveled. The invention of an accurate marine chronometer revolutionized marine navigation. By the end of the 19th cent ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Z Axis
In geometry, a Cartesian coordinate system (, ) in a plane is a coordinate system that specifies each point uniquely by a pair of real numbers called ''coordinates'', which are the signed distances to the point from two fixed perpendicular oriented lines, called '' coordinate lines'', ''coordinate axes'' or just ''axes'' (plural of ''axis'') of the system. The point where the axes meet is called the ''origin'' and has as coordinates. The axes directions represent an orthogonal basis. The combination of origin and basis forms a coordinate frame called the Cartesian frame. Similarly, the position of any point in three-dimensional space can be specified by three ''Cartesian coordinates'', which are the signed distances from the point to three mutually perpendicular planes. More generally, Cartesian coordinates specify the point in an -dimensional Euclidean space for any dimension . These coordinates are the signed distances from the point to mutually perpendicular fixed hype ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Film Industry
The film industry or motion picture industry comprises the technological and commercial institutions of filmmaking, i.e., film production company, production companies, film studios, cinematography, animation, film production, screenwriting, pre-production, post production, post-production, film festivals, Distribution (marketing), distribution, and actors. Though the expense involved in making film almost immediately led film production to concentrate under the auspices of standing production companies, advances in affordable filmmaking equipment, as well as an expansion of opportunities to acquire investment capital from outside the film industry itself, have allowed independent film production to evolve. In 2019, the global box office was worth . When including box office and Home video, home entertainment revenue, the global film industry was worth in 2018. Cinema of the United States, Hollywood is the world's oldest national film industry, and largest in terms of box-office ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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0 (number)
0 (zero) is a number representing an empty quantity. Adding (or subtracting) 0 to any number leaves that number unchanged; in mathematical terminology, 0 is the additive identity of the integers, rational numbers, real numbers, and complex numbers, as well as other algebraic structures. Multiplying any number by 0 results in 0, and consequently division by zero has no meaning in arithmetic. As a numerical digit, 0 plays a crucial role in decimal notation: it indicates that the power of ten corresponding to the place containing a 0 does not contribute to the total. For example, "205" in decimal means two hundreds, no tens, and five ones. The same principle applies in place-value notations that uses a base other than ten, such as binary and hexadecimal. The modern use of 0 in this manner derives from Indian mathematics that was transmitted to Europe via medieval Islamic mathematicians and popularized by Fibonacci. It was independently used by the Maya. Common names for th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Motorized Wheelchair
A motorized wheelchair, powerchair, electric wheelchair, or electric-powered wheelchair (EPW) is a wheelchair that is propelled by means of an electric motor (usually using differential steering) rather than human power, manual power. Motorized wheelchairs are useful for those unable to propel a manual wheelchair or who may need to use a wheelchair for distances or over terrain which would be fatiguing in a manual wheelchair. They may also be used not just by people with 'traditional' mobility impairments, but also by people with Circulatory system, cardiovascular and fatigue-based conditions. History An electrically propelled tricycle was developed by the R.A. Harding company in England in the 1920s. The first electric-powered wheelchair to be put into production was invented by George Klein (inventor), George Klein, who worked for the National Research Council of Canada, to assist injured veterans after World War II. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Lawn Mower
A lawn mower (also known as a grass cutter or simply mower, also often spelled lawnmower) is a device utilizing one or more revolving blades (or a reel) to cut a lawn, grass surface to an even height. The height of the cut grass may be fixed by the mower's design but generally is adjustable by the operator, typically by a single master lever or by a mechanism on each of the machine's wheels. The blades may be powered by manual force, with wheels mechanically connected to the cutting blades so that the blades spin when the mower is pushed forward, or the machine may have a Battery (electricity), battery-powered or AC power plugs and sockets, plug-in electric motor. The most common self-contained power source for lawn mowers is a small four-stroke engine, 4-stroke (typically Single-cylinder engine, one-cylinder) internal combustion engine. Smaller mowers often lack any form of self-propulsion, requiring human power to move over a surface; "walk-behind" mowers are self-propelled, re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |