Rowing is the act of propelling a human-powered watercraft using the sweeping motions of oars to displace water and generate reactional propulsion. Rowing is functionally similar to paddling, but rowing requires oars to be mechanically attached to the boat, and the rower drives the oar like a lever, exerting force in the same direction as the boat's travel; while paddles are completely hand-held and have no attachment to the boat, and are driven like a cantilever, exerting force opposite to the intended direction of the boat.
In some strict terminologies, using oars for propulsion may be termed either "pulling" or "rowing", with different definitions for each. Where these strict terminologies are used, the definitions are reversed depending on the context. On saltwater a "pulling boat" has each person working one oar on one side, alternating port and starboard along the length of the boat; whilst "rowing" means each person operates two oars, one on each side of the boat. On inland waterways, the opposite applies, with "rowing" being where each person in a crew works one oar and "sculling" (especially in sport rowing) involves each participant using a pair of oars. In a maritime setting "sculling" means propelling a boat with a single oar operated over the stern.
This article focuses on the general types of rowing, such as recreation and transport rather than the sport of competitive rowing which is a specialized case of boat racing using strictly regulated equipment and a highly refined technique.
In the Ancient World, all major ancient civilizations used rowing for transportation, commerce, and war. It was considered a way to advance their civilization during war and peace.
The beginning of rowing is clouded in history but the use of oars in the way they are used today can be traced back to ancient Egypt. Whether it was invented in Egypt or something learned from Mesopotamia via trade is not known. However, archaeologists have recovered a model of a rowing vessel in a tomb dating back to the 18-19th century BC.
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thumb|240px|Autre galère présentée au Musée d'histoire navale de Venise. Une galère (du grec médiéval / galéa) est un type de navire à rames et voiles latines sur un, deux ou trois mâts à antennes, d'abord à usage commercial puis à fonction essentiellement militaire. Elle est mue par des galériens qui constituent la chiourme. Ce sont des rameurs volontaires, des esclaves, des repris de justice, ou des protestants incorporés pour "faits de religion" sous Louis XIV.
Un aviron ou une rame est un outil destiné à la propulsion manuelle d'une embarcation. L'aviron est utilisé depuis l'Antiquité pour des usages aussi divers que la pêche, la guerre, le sport, le transport. L'aviron utilise la force motrice des corps des rameurs. En général, un aviron est formé d'une longue pièce de bois, le manche, et l'extrémité propulsive, la « pelle », qui trempe dans l'eau. L'extrémité de la manche est dans la ou les mains du rameur ou « nageur » (celui qui rame, ou « nage », en jargon maritime) ; et le point d'appui du levier, la « dame de nage », est situé sur la lisse de l'embarcation.
Human-powered watercraft are watercraft propelled only by human power, instead of being propelled by wind power (via one or more sails) or an engine. The three main methods of exerting human power are: directly from the hands or feet, sometimes aided by swimfins; through hand-operated oars, paddles, or poles, or; through the feet with pedalss, crankset or treadle. While most human-powered watercraft use buoyancy to maintain their position relative to the surface of the water, a few, such as human-powered hydrofoils and human-powered submarines, use hydrofoils, either alone or in addition to buoyancy.
The purpose of this study was to develop a methodology for the construction of models of interest to improve the choice of areas to radiate in the use of brachytherapy (BT). This work aims to propose a principal component model which is constructed from th ...