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Composite materials
Composite materials A composite material (or just composite) is a mixture of two or more materials with properties superior to the materials of which it is made. Many common examples of composite materials can be found in the world around us. Wood and bone are examples of natural composites. Wood... Read more |
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wood
wood botanically, the xylem tissue that forms the bulk of the stem of a woody plant. Xylem conducts sap upward from the roots to the leaves, stores food in the form of complex carbohydrates, and provides support; it is made up of various types of cells specialized for each of these purposes. Among... Read more |
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woodcut and wood engraving
woodcut and wood engraving prints made from designs cut in relief on wood, in contrast to copper or steel engraving and etching (which are intaglio ). The term woodcutting is loosely included within the wood-engraving process, from which, however, it can be distinguished. Woodcutting, the... Read more |
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Fernando Wood
Fernando Wood Fernando Wood (1812-1881), American politician, was mayor of New York City, and a leading Peace Democrat during the Civil War. Fernando Wood was born in Philadelphia on June 14, 1812. After a meager education, he worked at a number of jobs, twice failing in businesses of his... Read more |
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Shingle
Shingle Background Roofing shingles are made from several types of materials. Wood shingles are sawed from red cedar or pine. Modern shingles are cut from new growth trees and must be treated with chemical preservatives to make them last as well as earlier versions that were... Read more |
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Wood wastes
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John Wood
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Mountain beaver
mountain beaver stout, short-limbed North American rodent , Aplodontia rufa, not closely related to the true beaver. Also called sewellel beaver after the Chinook word for a robe made from its pelts, it is among the most primitive of the rodents and the only living member of its family. The... Read more |
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Apostle Islands
Apostle Islands group of more than 20 wooded islands, in Lake Superior, off N Wis. Madeline, 13 mi (21 km) long, is the largest island and has the group's only settlement, La Pointe. Noted for their wave-eroded cliffs and abundant wildlife, the islands are visited by tourists and hunters. The... Read more |
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lignin
lignin , a highly polymerized and complex chemical compound especially common in woody plants. The cellulose walls of the wood become impregnated with lignin, a process called lignification, which greatly increases the strength and hardness of the cell and gives the necessary rigidity to the tree.... Read more |
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Go, christmas tree, go, christmas tree: out the door with ye
...trees can keep giving long after all the presents...Christmas trees is widespread...percent of real trees recycled though community programs...made into wood chips for...The ... |