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Tennis Technology
Since the sport's inception, the design and manufacture of tennis equipment has been affected by technological advances and regulations. As is common in major sports, regulations became more exacting over time, with improvements affecting the qualities of the tennis racket and the tennis ball. Rackets As materials improved, becoming lighter and stronger, rackets were made larger, accordingly. Larger rackets have more surface area, making them easier for many players to return a ball. Sizes are: * Mid: and below * Mid-plus: * Oversized: * Super-oversized: and larger The balance point and grip size of a racket changed as technology progressed. Depending on the player's style of play, choice is made between a head-heavy racket and a head-light racket. Head-heavy rackets provide more power on serves and ground strokes, while head-light rackets provide more control. Along with racket balance, the size of the grip on the racket can affect play style as well. Materials Early ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tennis
Tennis is a racket sport that is played either individually against a single opponent ( singles) or between two teams of two players each ( doubles). Each player uses a tennis racket that is strung with cord to strike a hollow rubber ball covered with felt over or around a net and into the opponent's court. The object of the game is to manoeuvre the ball in such a way that the opponent is not able to play a valid return. The player who is unable to return the ball validly will not gain a point, while the opposite player will. Tennis is an Olympic sport and is played at all levels of society and at all ages. The sport can be played by anyone who can hold a racket, including wheelchair users. The modern game of tennis originated in Birmingham, England, in the late 19th century as lawn tennis. It had close connections both to various field (lawn) games such as croquet and bowls as well as to the older racket sport today called real tennis. The rules of modern tennis have ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magnesium
Magnesium is a chemical element with the symbol Mg and atomic number 12. It is a shiny gray metal having a low density, low melting point and high chemical reactivity. Like the other alkaline earth metals (group 2 of the periodic table) it occurs naturally only in combination with other elements and it almost always has an oxidation state of +2. It reacts readily with air to form a thin passivation coating of magnesium oxide that inhibits further corrosion of the metal. The free metal burns with a brilliant-white light. The metal is obtained mainly by electrolysis of magnesium salts obtained from brine. It is less dense than aluminium and is used primarily as a component in strong and lightweight alloys that contain aluminium. In the cosmos, magnesium is produced in large, aging stars by the sequential addition of three helium nuclei to a carbon nucleus. When such stars explode as supernovas, much of the magnesium is expelled into the interstellar medium where it ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spalding (sports Equipment)
Spalding is an American sports equipment manufacturing company founded by Albert Spalding in Chicago, in 1876, although it is now headquartered in Bowling Green, Kentucky. Spalding currently primarily focuses on basketball, mainly producing balls but also commercializing hoops, rims, nets and ball pump needles. Softballs are commercialized through its subsidiary Dudley Sports. In the past, Spalding has manufactured balls for other sports, such as American football, baseball, soccer, volleyball, tennis and golf. For a brief period in the 1980s, Spalding was also a designer of aftermarket automotive wheels. History The company was founded in 1876 when Albert Spalding was a pitcher and manager of a baseball team in Chicago, the Chicago White Stockings. The company standardized early baseballs and developed the modern baseball bat with the bulge at its apex. In 1892, Spalding acquired Wright & Ditson and A. J. Reach, both rival sporting goods companies. In 1893, A.G. Spal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carbon Fibre
Carbon fiber-reinforced polymers (American English), carbon-fibre-reinforced polymers (Commonwealth English), carbon-fiber-reinforced plastics, carbon-fiber reinforced-thermoplastic (CFRP, CRP, CFRTP), also known as carbon fiber, carbon composite, or just carbon, are extremely strong and light fiber-reinforced plastics that contain carbon fibers. CFRPs can be expensive to produce, but are commonly used wherever high strength-to-weight ratio and stiffness (rigidity) are required, such as aerospace, superstructures of ships, automotive, civil engineering, sports equipment, and an increasing number of consumer and technical applications. The binding polymer is often a thermoset resin such as epoxy, but other thermoset or thermoplastic polymers, such as polyester, vinyl ester, or nylon, are sometimes used. The properties of the final CFRP product can be affected by the type of additives introduced to the binding matrix (resin). The most common additive is silica, but other addit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Composite Material
A composite material (also called a composition material or shortened to composite, which is the common name) is a material which is produced from two or more constituent materials. These constituent materials have notably dissimilar chemical or physical properties and are merged to create a material with properties unlike the individual elements. Within the finished structure, the individual elements remain separate and distinct, distinguishing composites from mixtures and solid solutions. Typical engineered composite materials include: *Reinforced concrete and masonry *Composite wood such as plywood *Reinforced plastics, such as fibre-reinforced polymer or fiberglass *Ceramic matrix composites ( composite ceramic and metal matrices) *Metal matrix composites *and other advanced composite materials There are various reasons where new material can be favoured. Typical examples include materials which are less expensive, lighter, stronger or more durable when compared with commo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John McEnroe
John Patrick McEnroe Jr. (born February 16, 1959) is an American former professional tennis player. He was known for his shot-making and volleying skills, his rivalries with Björn Borg and Jimmy Connors, and his confrontational on-court behavior, which frequently landed him in trouble with umpires and tennis authorities. McEnroe is the only male player in tennis history to hold the world No. 1 ranking in both singles and doubles simultaneously. Only one other male player, Stefan Edberg, ever attained No. 1 in both, although at different times. McEnroe finished his career with 77 singles titles on the ATP Tour and 78 doubles titles; this remains the highest men's combined total of the Open Era. He is the only male player to win more than 70 titles in both the men's singles and the men's doubles categories. He also won 25 singles titles on the ATP Champions tour. He won seven Grand Slam singles titles (four at the US Open and three at Wimbledon), nine Grand Slam men's doubl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prince Original Graphite
The Prince original graphite, or the "POG" as it is called, or "The Original G" is a tennis racquet manufactured by Prince Sports. It was first introduced in 1980 and has been used by numerous world-class tennis players, including Andre Agassi, Michael Chang, Gabriela Sabatini, and Monica Seles Monica Seles (; hu, Széles Mónika, ; sr, Моника Селеш, Monika Seleš; born December 2, 1973) is a retired professional tennis player who represented Yugoslavia and the United States. A former world No. 1, she won nine Grand Slam .... The Graphite is a full-weighted tennis racquet with a box-shaped 19 mm beam, characterized by the Cross Bar Stabilizer, which reduces twisting on off-center hits. Most, if not all, versions were offered in either mid-size or oversized head. The racquet also featured a signature foam handle with a leather grip. Prince produced various versions of this racquet from the original in 1978 until 2016, including the Prince Graphite (The very ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Graphite
Graphite () is a crystalline form of the element carbon. It consists of stacked layers of graphene. Graphite occurs naturally and is the most stable form of carbon under standard conditions. Synthetic and natural graphite are consumed on large scale (300 kton/year, in 1989) for uses in pencils, lubricants, and electrodes. Under high pressures and temperatures it converts to diamond. It is a weak conductor of heat and electricity. Types and varieties Natural graphite The principal types of natural graphite, each occurring in different types of ore deposits, are * Crystalline small flakes of graphite (or flake graphite) occurs as isolated, flat, plate-like particles with hexagonal edges if unbroken. When broken the edges can be irregular or angular; * Amorphous graphite: very fine flake graphite is sometimes called amorphous; * Lump graphite (or vein graphite) occurs in fissure veins or fractures and appears as massive platy intergrowths of fibrous or acicular crystalline ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Organization Science (journal)
''Organization Science'' is a bimonthly peer-reviewed academic journal published by the Institute for Operations Research and the Management Sciences. It covers research on the dynamics of organizations. In 2012, it was one of the four general-management journals listed by the University of Texas at Dallas when ranking universities by research. In 2016, the journal was ranked on the ''Financial Times'' top 45 list. The editor-in-chief is Gautam Ahuja (Cornell University). According to the ''Journal Citation Reports'', the journal has a 2021 impact factor The impact factor (IF) or journal impact factor (JIF) of an academic journal is a scientometric index calculated by Clarivate that reflects the yearly mean number of citations of articles published in the last two years in a given journal, as ... of 5.152. References External links * Publications established in 1990 Bimonthly journals Business and management journals INFORMS academic journals English-language journa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tennis Ball
A tennis ball is a ball designed for the sport of tennis. Tennis balls are fluorescent yellow in organised competitions, but in recreational play can be virtually any color. Tennis balls are covered in a fibrous felt which modifies their aerodynamic properties, and each has a white curvilinear oval covering it. Specifications Modern tennis balls must conform to certain criteria for size, weight, deformation, and bounce criteria to be approved for regulation play. The International Tennis Federation (ITF) defines the official diameter as . Balls must have masses in the range . Yellow and white are the only colors approved by the ITF, and most balls produced are a fluorescent yellow known as "optic yellow", first introduced in 1972 following research demonstrating they were more visible on television. Tennis balls are filled with air and are surfaced by a uniform felt-covered rubber compound. The felt delays flow separation in the boundary layer which reduces aerodynamic drag an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lamar Hunt
Lamar Hunt (August 2, 1932 – December 13, 2006) was an American businessman most notable for his promotion of American football, soccer, and tennis in the United States. He was the principal founder of the American Football League (AFL) and Major League Soccer (MLS), as well as MLS's predecessor, the North American Soccer League (NASL), and co-founder of World Championship Tennis. He was also the founder and owner of the Kansas City Chiefs of the National Football League (NFL), the Kansas City Wizards of MLS, and at the time of his death owned two other MLS teams, Columbus Crew and FC Dallas. In Kansas City, Hunt also helped establish the Worlds of Fun and Oceans of Fun theme parks. The oldest ongoing national soccer tournament in the United States, the U.S. Open Cup (founded 1914), now bears his name in honor of his pioneering role in that sport stateside. He was inducted into the Pro Football Hall of Fame in 1972; into the National Soccer Hall of Fame in 1982; and i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
World Championship Tennis
World Championship Tennis (WCT) was a tour for professional male tennis players established in 1968 (the first players signed a contract at the end of 1967) and lasted until the emergence of the ATP Tour in 1990. A number of tennis tournaments around the world were affiliated with WCT and players were ranked in a special WCT ranking according to their results in those tournaments. The WCT had an important impact on the commercial development of tennis. It instituted a tie-breaker system and outfitted players with colored clothing, a radical idea at that time. WCT also strongly encouraged the audience to cheer for players, rather than politely applaud, as the more staid tennis audiences had done before. They publicly emphasized their prize money structure and special bonus pool as an incentive to attract top players. History World Championship Tennis was founded in September 1967 by New Orleans sports promoter David Dixon, who had earlier witnessed the dreary conditions of the prof ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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