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Canoe Sprint
Canoe sprint is a water sport in which athletes race canoes or kayaks on calm water. Overview Race categories vary by the number of athletes in the boat, the length of the course, and whether the boat is a canoe or kayak. Canoe sprints are sometimes referred to as flat water racing. The distances recognized by the ICF for international canoe sprint races are 200m, 500m, and 1000m. These races take place on straight courses with each boat paddling in its own designated lane. Longer marathon races do exist, notably the 5000m (also an ICF-recognized distance) – these usually have athletes starting in a large pack at a start line before paddling around a set course with marked turning points (there are no assigned lanes). For each race a number of heats, semi-finals and a final may be necessary, depending on the number of competitors. The sport is governed by the International Canoe Federation. The International Canoe Federation is the worldwide canoeing organization and create ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rio 2016
) , nations = 207 (including IOA and EOR teams) , athletes = 11,238 , events = 306 in 28 sports (41 disciplines) , opening = 5 August 2016 , closing = 21 August 2016 , opened_by = Vice President Michel Temer , cauldron = Vanderlei Cordeiro de Lima , stadium = Maracanã Stadium (ceremonies), Estádio Olímpico João Havelange (athletics competition) , summer_prev = London 2012 , summer_next = Tokyo 2020 , winter_prev = Sochi 2014 , winter_next = Pyeongchang 2018 The 2016 Summer Olympics ( pt, Jogos Olímpicos de Verão de 2016), officially the Games of the XXXI Olympiad ( pt, Jogos da XXXI Olimpíada) and also known as Rio 2016, was an international multi-sport event held from 5 to 21 August 2016 in Rio de Janeiro, Brazil, with preliminary events in some sports beginning on 3 August. Rio de Janeiro was announced as the host city at the 121st IOC Session in Copenhagen, Denmark, on 2 October 2009. 11,238 athletes from 207 nations took part in the 2016 Game ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Epoxy Resin
Epoxy is the family of basic components or Curing (chemistry), cured end products of epoxy resins. Epoxy resins, also known as polyepoxides, are a class of reactive prepolymers and polymers which contain epoxide groups. The epoxide functional group is also collectively called ''epoxy''. The IUPAC name for an epoxide group is an oxirane. Epoxy resins may be reacted (cross-linked) either with themselves through catalytic homopolymerisation, or with a wide range of co-reactants including polyfunctional amines, acids (and acid anhydrides), phenols, alcohols and thiols (usually called mercaptans). These co-reactants are often referred to as hardeners or curatives, and the cross-linking reaction is commonly referred to as curing. Reaction of polyepoxides with themselves or with polyfunctional hardeners forms a thermosetting polymer, often with favorable mechanical properties and high thermal and chemical resistance. Epoxy has a wide range of applications, including metal coatings, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canoeing Disciplines
Canoeing is an activity which involves paddling a canoe with a single-bladed paddle. Common meanings of the term are limited to when the canoeing is the central purpose of the activity. Broader meanings include when it is combined with other activities such as canoe camping, or where canoeing is merely a transportation method used to accomplish other activities. Most present-day canoeing is done as or as a part of a sport or recreational activity. In some parts of Europe canoeing refers to both canoeing and kayaking, with a canoe being called an ''open canoe''. A few of the recreational forms of canoeing are canoe camping and canoe racing. Other forms include a wide range of canoeing on lakes, rivers, oceans, ponds and streams. History of organized recreational canoeing Canoeing is an ancient mode of transportation. Modern recreational canoeing was established in the late 19th century. In 1924, canoeing associations from Austria, Germany, Denmark and Sweden founded the ''I ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canoe Sprint
Canoe sprint is a water sport in which athletes race canoes or kayaks on calm water. Overview Race categories vary by the number of athletes in the boat, the length of the course, and whether the boat is a canoe or kayak. Canoe sprints are sometimes referred to as flat water racing. The distances recognized by the ICF for international canoe sprint races are 200m, 500m, and 1000m. These races take place on straight courses with each boat paddling in its own designated lane. Longer marathon races do exist, notably the 5000m (also an ICF-recognized distance) – these usually have athletes starting in a large pack at a start line before paddling around a set course with marked turning points (there are no assigned lanes). For each race a number of heats, semi-finals and a final may be necessary, depending on the number of competitors. The sport is governed by the International Canoe Federation. The International Canoe Federation is the worldwide canoeing organization and create ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
War Canoe
A war canoe is a watercraft of the canoe type designed and outfitted for warfare, and which is found in various forms in many world cultures. In modern times, such designs have become adapted as a sport, and "war canoe" can mean a type of flatwater racing canoe. History War canoes were used in Africa, Austronesia, Americas and Europe to transport troops and supplies, and engage targets onshore. While documentation of canoe versus canoe battles on the open ocean is rare, records from the 14th century mention various peoples of West Africa using huge fighting canoes in inland waters, some up to and carrying over 100 men.Robert Smith, The Canoe in West African History, The Journal of African History, Vol. 11, No. 4 (1970), pp. 515–533 Construction of the war canoe was typically from one massive tree trunk, with the silk cotton tree being particularly useful. The inside was dug out and carved using fire and hand tools. Braces and stays were used to prevent excessive expansion whi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wing
A wing is a type of fin that produces lift while moving through air or some other fluid. Accordingly, wings have streamlined cross-sections that are subject to aerodynamic forces and act as airfoils. A wing's aerodynamic efficiency is expressed as its lift-to-drag ratio. The lift a wing generates at a given speed and angle of attack can be one to two orders of magnitude greater than the total drag on the wing. A high lift-to-drag ratio requires a significantly smaller thrust to propel the wings through the air at sufficient lift. Lifting structures used in water include various foils, such as hydrofoils. Hydrodynamics is the governing science, rather than aerodynamics. Applications of underwater foils occur in hydroplanes, sailboats and submarines. Etymology and usage For many centuries, the word "wing", from the Old Norse ''vængr'', referred mainly to the foremost limbs of birds (in addition to the architectural aisle). But in recent centuries the word's meanin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rudder
A rudder is a primary control surface used to steer a ship, boat, submarine, hovercraft, aircraft, or other vehicle that moves through a fluid medium (generally air or water). On an aircraft the rudder is used primarily to counter adverse yaw and p-factor and is not the primary control used to turn the airplane. A rudder operates by redirecting the fluid past the hull or fuselage, thus imparting a turning or yawing motion to the craft. In basic form, a rudder is a flat plane or sheet of material attached with hinges to the craft's stern, tail, or after end. Often rudders are shaped so as to minimize hydrodynamic or aerodynamic drag. On simple watercraft, a tiller—essentially, a stick or pole acting as a lever arm—may be attached to the top of the rudder to allow it to be turned by a helmsman. In larger vessels, cables, pushrods, or hydraulics may be used to link rudders to steering wheels. In typical aircraft, the rudder is operated by pedals via mechanical li ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paddle
A paddle is a handheld tool with an elongated handle and a flat, widened distal end (i.e. the ''blade''), used as a lever to apply force onto the bladed end. It most commonly describes a completely handheld tool used to propel a human-powered watercraft by pushing water in a direction opposite to the direction of travel (i.e. paddling). It is different to an oar (which is similar in shape and performs the same function via rowing) in that the latter is attached to the watercraft via a fulcrum. However, the term "paddle" can also be used to describe objects of similar shapes or functions: *A rotating set of paddle boards known as a paddle wheel is used to propel a steamboat (i.e. paddle steamer). *A number of games (e.g. ping-pong), a "paddle" or "bat" is a small racket used to strike a ball. *A mixing paddle is an agitator device used to stir and more thoroughly mix separate ingredients within a mixture. *A spanking paddle is used in corporal punishment, typically to forc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kevlar
Kevlar (para-aramid) is a strong, heat-resistant synthetic fiber, related to other aramids such as Nomex and Technora. Developed by Stephanie Kwolek at DuPont in 1965, the high-strength material was first used commercially in the early 1970s as a replacement for steel in racing tires. It is typically spun into ropes or fabric sheets that can be used as such, or as an ingredient in composite material components. Kevlar has many applications, ranging from bicycle tires and racing sails to bulletproof vests, all due to its high tensile strength-to-weight ratio; by this measure it is five times stronger than steel. It is also used to make modern marching drumheads that withstand high impact; and for mooring lines and other underwater applications. A similar fiber called Twaron with the same chemical structure was developed by Akzo in the 1970s; commercial production started in 1986, and Twaron is now manufactured by Teijin. History Poly-paraphenylene terephthalamide (K2 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Water Sport
Water sports or aquatic sports are sport activities conducted on waterbodies, and can be categorized according to the degree of immersion by the participants. On the water * Boat racing, the use of powerboats to participate in races * Boating, the use of boats for personal recreation * Cable skiing, similar to wake boarding but with cables for artificial maneuvering * Canoe polo combines boating and ball handling skills with a contact team game, where tactics and positional play are as important as the speed and fitness of the individual athletes. * Canoeing is an activity which involves paddling a canoe with a single-bladed paddle. Most present-day canoeing is done as or as a part of a sport or recreational activity. * Dragon boat racing, teams of 20 paddlers racing the ancient dragon boat * Fishing, the recreation and sport of catching fish * Flyboard, a brand of hydroflighting device which supplies propulsion to drive the Flyboard into the air to perform a sport known as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aramid
Aramid fibers, short for aromatic polyamide, are a class of heat-resistant and strong synthetic fibers. They are used in aerospace and military applications, for ballistic-rated body armor fabric and ballistic composites, in marine cordage, marine hull reinforcement, and as an asbestos substitute. The chain molecules in the fibers are highly oriented along the fiber axis. As a result, a higher proportion of the chemical bond contributes more to fiber strength than in many other synthetic fibers. Aramids have a very high melting point (>500 °C). Common aramid brand names include Kevlar, Nomex, and Twaron. Terminology and chemical structure ''Aramid'' is a shortened form of aromatic polyamide. The term was introduced in 1972, accepted in 1974 by the Federal Trade Commission of the USA as the name of a generic category of fiber distinct from nylon, and adopted by the International Standards Organisation in 1977. Aromatic in the name refers to the presence of aromatic r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carbon Fiber
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 a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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