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Strings (tennis)
In tennis, the strings are the part of a tennis racquet which make contact with the ball. The strings form a woven network inside the head (or "hoop") of the racquet. Strings have been made with a variety of materials and possess varying properties that have been measured, such as dynamic stiffness, tension retention, thickness (gauge), string texture (shape of the string), and rebound efficiency. Composition The material used in tennis string can significantly affect a player's performance, and even health. Several materials are used to make tennis strings. They vary in terms of elasticity, durability, rebound efficiency, tension holding capability, and manufacturing cost, among other considerations. Natural gut Animal intestine is the most resilient material used to make tennis strings. It has better tension retention than any other material, and also is softer than any other material used for tennis strings. It provides the most energy return, meaning it is the most efficien ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prince Syngutdf Auflicht
A prince is a Monarch, male ruler (ranked below a king, grand prince, and grand duke) or a male member of a monarch's or former monarch's family. ''Prince'' is also a title of nobility (often highest), often hereditary title, hereditary, in some European State (polity), states. The female equivalent is a princess. The English language, English word derives, via the French language, French word ''prince'', from the Latin noun , from (first) and (head), meaning "the first, foremost, the chief, most distinguished, noble monarch, ruler, prince". In a related sense, now not commonly used, all more or less sovereign rulers over a state, including kings, were "princes" in the language of international politics. They normally had another title, for example king or duke. Many of these were Princes of the Holy Roman Empire. Historical background The Latin word (older Latin *prīsmo-kaps, ), became the usual title of the informal leader of the Roman senate some centuries before the tra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gustavo Kuerten French Open 2005
Gustavo is the Latinate form of a Germanic male given name with respective prevalence in Portuguese, Spanish, and Italian. It is derived from Gustav /ˈɡʊstɑːv/, also spelled Gustaf, a Swedish name, likely from Slavic Gostislav. People with the name Drama, film and television * Gustavo Alatriste, Mexican actor, director, and producer of films, married to Silvia Pinal * Gustavo Aguerre (born 1953), Argentine artist, curator, writer, and theatre designer * Gustavo Sorola, American actor, podcast host, and co-founder of the American company, Rooster Teeth Engineering, religion and science * Gustavo Colonnetti (1886–1968), Italian mathematician and engineer * Gustavo Gutiérrez Merino (1928-2024), Peruvian theologian and Dominican priest regarded as the founder of Liberation Theology at the University of Notre Dame * Gustavo Tamayo, Colombian ophthalmologist * Gustavo Marín, Chilean-French economist and sociologist * Gustavo Scuseria (born 1956), Robert A. Welch Prof ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pound-force
The pound of force or pound-force (symbol: lbf, sometimes lbf,) is a unit of force used in some systems of measurement, including English Engineering units and the foot–pound–second system. Pound-force should not be confused with pound-mass (lb), often simply called "pound", which is a unit of mass; nor should these be confused with foot-pound (ft⋅lbf), a unit of energy, or pound-foot (lbf⋅ft), a unit of torque. Definitions The pound-force is equal to the gravitational force exerted on a mass of one avoirdupois pound on the surface of Earth. Since the 18th century, the unit has been used in low-precision measurements, for which small changes in Earth's gravity (which varies from equator to pole by up to half a percent) can safely be neglected. The 20th century, however, brought the need for a more precise definition, requiring a standardized value for acceleration due to gravity. Product of avoirdupois pound and standard gravity The pound-force is the p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Knot
A knot is an intentional complication in Rope, cordage which may be practical or decorative, or both. Practical knots are classified by function, including List of hitch knots, hitches, List of bend knots, bends, List of loop knots, loop knots, and Rope splicing, splices: a ''hitch'' fastens a rope to another object; a ''bend'' fastens two ends of a rope to each another; a ''loop knot'' is any knot creating a loop; and ''splice'' denotes any multi-strand knot, including bends and loops. A knot may also refer, in the strictest sense, to a stopper (knot), stopper or knob at the end of a rope to keep that end from slipping through a grommet or eye. Knots have excited interest since ancient times for their practical uses, as well as their Topology, topological intricacy, studied in the area of mathematics known as knot theory. History Knots and knotting have been used and studied throughout history. For example, Chinese knotting is a decorative handicraft art that began as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Half Hitch
The half hitch is a simple List of hitch knots, hitch knot, where the Knot#Working end, working end of a line is brought over and under the Knot#Standing part, standing part. Insecure on its own, it is a valuable component of a wide variety of useful and reliable List of hitch knots, hitches, Bend knot, bends, and knots. Securing an additional single hitch to the rope's standing part produces the related knot two half-hitches.Alternatively, a half hitch may be made secure on its own by placing the final crossing opposite to the turn around the working end. This locks the end in place, and holds fast as long as the hitch is loaded by a steady pull. A half hitch in this configuration is sometimes used to tie strings to the bridge of a classical guitar. Another instance where a half hitch stands on its own without additional embellishment is when added to a timber hitch to help stabilize a load in the direction of pull. A timber hitch is tied on the far end of the load to bind ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spaghetti Racquet
The "spaghetti" racquet was a type of double-strung tennis racquet that had a brief spike in popularity in the fall of 1977, revolutionizing the sport for about a month before being banned at the top levels of play. It applied far more spin to a tennis ball than conventionally strung racquets, leading to disorienting movements through the air, especially after bounces. Design The racquet frame is not what is unusual about the spaghetti racquet; the difference lies in how it is strung. Rather than one set of interwoven strings, it features two stacked atop each other. The vertical (or main) strings and the horizontal (or cross) strings do not intertwine; rather, the cross strings sit between the two main ones, leaving all the strings a greater range of motion. There are fewer cross strings than on a traditional racquet — typically 5 or 6 pairs instead of the usual 20. Where the main and cross strings meet, the main strings are protected by small segments of sheath tubing, and th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nylon
Nylon is a family of synthetic polymers characterised by amide linkages, typically connecting aliphatic or Polyamide#Classification, semi-aromatic groups. Nylons are generally brownish in color and can possess a soft texture, with some varieties exhibiting a silk-like appearance. As Thermoplastic, thermoplastics, nylons can be melt-processed into fibres, Thin film, films, and diverse shapes. The properties of nylons are often modified by blending with a variety of additives. Numerous types of nylon are available. One family, designated nylon-XY, is derived from diamines and dicarboxylic acids of carbon chain lengths X and Y, respectively. An important example is nylon-6,6 (). Another family, designated nylon-Z, is derived from amino acid, aminocarboxylic acids with carbon chain length Z. An example is nylon-[6]. Nylon polymers have extensive commercial applications, including uses in textiles and fibres (such as apparel, flooring and rubber reinforcement), molded components fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Titanium
Titanium is a chemical element; it has symbol Ti and atomic number 22. Found in nature only as an oxide, it can be reduced to produce a lustrous transition metal with a silver color, low density, and high strength, resistant to corrosion in sea water, aqua regia, and chlorine. Titanium was discovered in Cornwall, Great Britain, by William Gregor in 1791 and was named by Martin Heinrich Klaproth after the Titans of Greek mythology. The element occurs within a number of minerals, principally rutile and ilmenite, which are widely distributed in the Earth's crust and lithosphere; it is found in almost all living things, as well as bodies of water, rocks, and soils. The metal is extracted from its principal mineral ores by the Kroll and Hunter processes. The most common compound, titanium dioxide (TiO2), is a popular photocatalyst and is used in the manufacture of white pigments. Other compounds include titanium tetrachloride (TiCl4), a component of smoke screens and cata ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polyolefin
A polyolefin is a type of polymer with the general formula (CH2CHR)n where R is an alkyl group. They are usually derived from a small set of simple olefins (alkenes). Dominant in a commercial sense are polyethylene and polypropylene. More specialized polyolefins include Polyisobutene, polyisobutylene and polymethylpentene. They are all colorless or white oils or solids. Many copolymers are known, such as polybutene, which derives from a mixture of different butene isomers. The name of each polyolefin indicates the olefin from which it is prepared; for example, polyethylene is derived from ethylene, and polymethylpentene is derived from 4-methyl-1-pentene. Polyolefins are not olefins themselves because the double bond of each olefin monomer is opened in order to form the polymer. Monomers having more than one double bond such as butadiene and isoprene yield polymers that contain double bonds (polybutadiene and polyisoprene) and are usually not considered polyolefins. Polyolefins are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ProKennex
ProKennex is a Taiwanese manufacturer of racquet sports equipment for tennis, squash, badminton, racquetball, and pickleball. The company enjoyed wide global distribution in the 1980s, when manufacturing in Taiwan was booming due to domestic economic conditions. Parent company Kunnan Enterprise Ltd. has faced financial difficulties since the mid 1990s, leading to a contraction of the ProKennex name globally. Today, the company focuses on a niche set of consumers interested in technology advancements in racquet sports. The company focuses on this aspect of its products by promoting itself as a "science and design company", rather than a standard racket manufacturer. History The origins of the company began in 1965 when Lo Kunnan, the son of a plastic toy gun manufacturer, began producing wooden badminton racquets in the backyard of his father's house. In 1968, Lo moved on to producing wooden tennis racquets, followed by aluminum racquets in 1973. In 1969, Lo launched sporting go ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yonex
is a Japanese sports equipment manufacturing company. Yonex produces equipment and apparel for tennis, badminton, golf, and running. Its range of products manufactured and commercialized includes equipment for badminton and tennis ( rackets, shuttlecocks, balls, bags) and golf (clubs, bags). Yonex also produces athletic shoes and apparel Clothing (also known as clothes, garments, dress, apparel, or attire) is any item worn on a human human body, body. Typically, clothing is made of fabrics or textiles, but over time it has included garments made from animal skin and other thin s ... including T-shirts, jackets, skirts, shorts, hoodies, leggings and hats. History The company was founded in 1946 by Minoru Yoneyama as a producer of wooden Glass float, floats for fishing nets. The company was later forced out of this market because of the invention of plastic floats. This led to a commitment by Yoneyama to never again be left behind by technological advancements. In 1957, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
