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materialism
materialism in philosophy, a widely held system of thought that explains the nature of the world as entirely dependent on matter, the fundamental and final reality beyond which nothing need be sought. Certain periods in history, usually those associated with scientific advance, are marked by strong...
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dialectical materialism
dialectical materialism official philosophy of Communism, based on the writings of Karl Marx and Friedrich Engels , as elaborated by G. V. Plekhanov , V. I. Lenin , and Joseph Stalin . In theory dialectical materialism is meant to provide both a general world view and a specific method for th...
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composite material
composite material or composite, any material made from at least two discrete substances, such as concrete. Many materials are produced as composites, such as the fiberglass -reinforced plastics used for automobile bodies and boat hulls, but the term usually is used to describe any of various ...
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ceramics
ceramics , materials made of nonmetallic minerals that have been permanently hardened by firing at a high temperature, or objects made of such materials. Most ceramics resist heat and chemicals and are poor conductors of heat and electricity. Traditional ceramics are made of clay and other natural o...
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leaf mold
leaf mold crumbly brown humus typical of forest floors. It is composed of decayed leaves and other plant material mixed with soil.
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dredging
dredging process of excavating materials underwater. It is used to deepen waterways, harbors, and docks and for mining alluvial mineral deposits, including tin, gold, and diamonds.
The Dutch at an early period cleared their canals of silt with a pole to which was attached a bag held open by a ...
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fiberglass
fiberglass thread made from glass. It is made by forcing molten glass through a kind of sieve, thereby spinning it into threads. Fiberglass is strong, durable, and impervious to many caustics and to extreme temperatures. For those qualities, fabrics woven from the glass threads are widely used for ...
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Young's modulus
Young's modulus [for Thomas Young ], number representing (in pounds per square inch or dynes per square centimeter) the ratio of stress to strain for a wire or bar of a given substance. According to Hooke's law the strain is proportional to stress, and therefore the ratio of the two is a constant ...
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pinocytosis
pinocytosis A form of endocytosis in which the material enclosed is a liquid and there is no fusion with a lysosome. Pinocytosis may be a means by which macromolecules (e.g. hormones and proteins) are taken into a cell....
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annealing
annealing , process in which glass, metals, and other materials are treated to render them less brittle and more workable. Annealing consists of heating the material and then cooling it very slowly and uniformly; the time and temperatures required in the process are set according to the properties d...
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