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SPiN
Spin or spinning most often refers to: * Spinning (textiles), the creation of yarn or thread by twisting fibers together, traditionally by hand spinning * Spin, the rotation of an object around a central axis * Spin (propaganda), an intentionally biased portrayal of something Spin, spinning or spinnin may also refer to: Physics and mathematics * Spin, the rotation of an object around a central axis * Spin (physics) or particle spin, a fundamental property of elementary particles * Spin group, a particular double cover of the special orthogonal group SO(''n'') * Spin tensor, a tensor quantity for describing spinning motion in special relativity and general relativity * Spin (aerodynamics), autorotation of an aerodynamically stalled aeroplane * SPIN bibliographic database, an indexing and abstracting service focusing on physics research Textile arts * Spinning (polymers), a process for creating polymer fibres * Spinning (textiles), the creation of yarn or thread by twisting fibe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Figure Skating Spins
Spins are an element in figure skating in which the skater rotates, centered on a single point on the ice, while holding one or more body positions. They are performed by all disciplines of the sport, single skating, pair skating, and ice dance, and are a required element in most figure skating competitions. As '' The New York Times'' says, "While jumps look like sport, spins look more like art. While jumps provide the suspense, spins provide the scenery, but there is so much more to the scenery than most viewers have time or means to grasp". According to world champion and figure skating commentator Scott Hamilton, spins are often used "as breathing points or transitions to bigger things" Figure skating spins, along with jumps, spirals, and spread eagles were originally individual compulsory figures, sometimes special figures. Unlike jumps, spins were a "graceful and appreciated"Hines, p. 103 part of figure skating throughout the 19th century. They advanced between World W ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spin (physics)
Spin is a conserved quantity carried by elementary particles, and thus by composite particles ( hadrons) and atomic nuclei. Spin is one of two types of angular momentum in quantum mechanics, the other being ''orbital angular momentum''. The orbital angular momentum operator is the quantum-mechanical counterpart to the classical angular momentum of orbital revolution and appears when there is periodic structure to its wavefunction as the angle varies. For photons, spin is the quantum-mechanical counterpart of the polarization of light; for electrons, the spin has no classical counterpart. The existence of electron spin angular momentum is inferred from experiments, such as the Stern–Gerlach experiment, in which silver atoms were observed to possess two possible discrete angular momenta despite having no orbital angular momentum. The existence of the electron spin can also be inferred theoretically from the spin–statistics theorem and from the Pauli exclusion principle— ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spin (aerodynamics)
In flight dynamics a spin is a special category of stall resulting in autorotation (uncommanded roll) about the aircraft's longitudinal axis and a shallow, rotating, downward path approximately centred on a vertical axis. Spins can be entered intentionally or unintentionally, from any flight attitude if the aircraft has sufficient yaw while at the stall point. In a normal spin, the wing on the inside of the turn stalls while the outside wing remains flying. It is possible for both wings to stall, but the angle of attack of each wing, and consequently its lift and drag, are different. Either situation causes the aircraft to autorotate toward the stalled wing due to its higher drag and loss of lift. Spins are characterized by high angle of attack, an airspeed below the stall on at least one wing and a shallow descent. Recovery and avoiding a crash may require a specific and counter-intuitive set of actions. A spin differs from a spiral dive, in which neither wing is stalled ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hand Spinning
Spinning is an ancient textile art in which plant, animal or synthetic fibres are drawn out and twisted together to form yarn. For thousands of years, fibre was spun by hand using simple tools, the spindle and distaff. It was only with the invention of the spinning wheel in the Islamic world circa 1030, and its subsequent introduction to China, India and Europe in the High Middle Ages, that the output of individual spinners dramatically increased. Mass production later arose in the 18th century with the beginnings of the Industrial Revolution. Hand-spinning remains a popular handicraft. Characteristics of spun yarn vary according to the material used, fibre length and alignment, quantity of fibre used, and degree of twist. History The origins of spinning fibre to make string or yarn are lost in time, but archaeological evidence in the form of representation of string skirts has been dated to the Upper Paleolithic era some 20,000 years ago. There has also been recent dis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spin (cue Sports)
The following is a glossary of traditional English-language terms used in the three overarching cue sports disciplines: ''carom billiards'' referring to the various games played on a billiard table without ; ''pool'', which denotes a host of games played on a table with six pockets; and ''snooker'', played on a large pocket table, and which has a sport culture unto itself distinct from pool. There are also games such as English billiards that include aspects of multiple disciplines. Definitions and language The term "" is sometimes used to refer to all of the cue sports, to a specific class of them, or to specific ones such as English billiards; this article uses the term in its most generic sense unless otherwise noted. The labels "British" and " UK" as applied to entries in this glossary refer to terms originating in the UK and also used in countries that were fairly recently part of the British Empire and/or are part of the Commonwealth of Nations, as opposed to US (and, oft ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spin (table Tennis)
Table tennis, also known as ping-pong and whiff-whaff, is a sport in which two or four players hit a lightweight ball, also known as the ping-pong ball, back and forth across a table using small solid rackets. It takes place on a hard table divided by a net. Except for the initial serve, the rules are generally as follows: Players must allow a ball played toward them to bounce once on their side of the table and must return it so that it bounces on the opposite side. A point is scored when a player fails to return the ball within the rules. Play is fast and demands quick reactions. Spinning the ball alters its trajectory and limits an opponent's options, giving the hitter a great advantage. Table tennis is governed by the worldwide organization International Table Tennis Federation (ITTF), founded in 1926. ITTF currently includes 226 member associations. The official rules are specified in the ITTF handbook. Table tennis has been an Olympic sport since 1988, with several event ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pen Spinning
Pen spinning is a form of object manipulation that involves the deft manipulation of a writing instrument with hands. Although it is often considered a form of self-entertainment (usually in a school or office setting), multinational competitions and meetings are sometimes held. It is sometimes classified as a form of contact juggling; however, some tricks, e.g. "spreads" and "aerial tricks" do leave contact with the body. In addition to writing instruments, it is often also seen performed by drummers with their drumsticks. In fact, drumsticks are substantially easier to manipulate than pens, because of their extra mass and length. Pen spinning has quickly gained international popularity through online video sharing and forums. The hobby has been popular around the world since at least the 1970s. History The earliest record of pen spinning comes from a student in pre-WWII Japan. Others in Japan spun pens at least as early as the 1970s; however, the tricks performed were only bas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spinning (textiles)
Spinning is a twisting technique to form yarn from fibers. The fiber intended is drawn out, twisted, and wound onto a bobbin. A few popular fibers that are spun into yarn other than cotton, which is the most popular, are viscose (the most common form of rayon), and synthetic polyester. Originally done by hand using a spindle whorl, starting in the 500s AD the spinning wheel became the predominant spinning tool across Asia and Europe. The spinning jenny and spinning mule, invented in the late 1700s, made mechanical spinning far more efficient than spinning by hand, and especially made cotton manufacturing one of the most important industries of the Industrial Revolution. Process The yarn issuing from the drafting rollers passes through a thread-guide, round a traveller that is free to rotate around a ring, and then onto a tube or bobbin, which is carried on to a spindle, the axis of which passes through a center of the ring. The spindle is driven (usually at an angular ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spin Bowling
Spin bowling is a bowling technique in cricket, in which the ball is delivered slowly but with the potential to deviate sharply after bouncing. The bowler is referred to as a spinner. Purpose The main aim of spin bowling is to bowl the cricket ball with rapid rotation so that when it bounces on the pitch it will deviate from its normal straight path, thus making it difficult for the batsman to hit the ball cleanly.Knight, pp.122–123. The speed the ball travels is not critical, and is significantly slower than that for fast bowling. A typical spin delivery has a speed in the range 70–90 km/h (45–55 mph). Techniques Spin bowling is divided into four different categories, depending on the particular physical technique used. There is virtually no overlap between the two basic biomechanical techniques of wrist spin and finger spin. Depending on technique, a spin bowler uses either predominant wrist or finger motion to impart spin to the ball around a horiz ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chevrolet Spin
The Chevrolet Spin is a mini MPV produced by General Motors under the Chevrolet marque. Developed by GM do Brasil, the vehicle replaced the Meriva and Zafira in South America with an option of two-row and three-row seating. It is produced in Brazil since 2012 and has been exported throughout the South American region. Between 2013 and 2015, GM Indonesia assembled the vehicle for the Southeast Asian market at its Bekasi plant. Overview The Spin was mainly designed and engineered in Brazil by GM Brasil Centro Tecnológico São Caetano do Sul. During development, it was known as the PM5/PM7 project. The vehicle is developed to replace both the Chevrolet Meriva and Chevrolet Zafira in South America which was developed by Opel. It is built on the same platform as the Brazilian Chevrolet Cobalt. Developed with a goal of a large cabin space, the vehicle is built on a -long wheelbase which is shared with the Cobalt. For three-row models, the seats are arranged in a "theatre" fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glossary Of Tennis Terms
This page is a glossary of tennis terminology. A * Ace: Serve where the tennis ball lands inside the '' service box'' and is not touched by the receiver; thus, a shot that is both a serve and a winner is an ace. Aces are usually powerful and generally land on or near one of the corners at the back of the service box. Initially, the term was used to indicate the scoring of a point. * Action: Synonym of '' spin''. * Ad court: Left side of the court of each player, so called because the ''ad'' (''advantage'') point immediately following a deuce is always served to this side of the court. * Ad in: ''Advantage'' to the '' server''. * Ad out: ''Advantage'' to the '' receiver''. * Ad: Used by the chair umpire to announce the score when a player has the ''advantage'', meaning they won the point immediately after a ''deuce''. See scoring in tennis. * Advantage set: Set won by a player or team having won at least six games with a two-game advantage over the opponent (as opposed to a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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