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A blazed diffraction grating reflecting only the green portion of the spectrum from a room's fluorescent lighting. For a diffraction grating, the relationship between the grating spacing (i.e., the distance between adjacent grating grooves or slits), the angle of the wave (light) incidence to the grating, and the diffracted wave from the grating is known as the grating equation.
It is usually expressed as Michelson contrast: [2] the difference between maximum and minimum luminance divided by their sum. Orientation is the angle the grating makes with some reference orientation (such as the y-axis in a picture or of another grating). It is usually measured in degree or in radians.
Grate firing is a type of industrial combustion system used for solid fuels. It now is used mainly for burning waste and biomass, but also for smaller coal furnaces. Capacities 0.3 to 175 MWth in industry and CHP; Fuel fired per grate area 1-2 MW/m 2, maximum grate area 100 m 2
The Weber Piano Company is a former piano manufacturing company based in New York City and East Rochester, New York from the middle of the 19th century through the beginning of the 20th century, and continued as a division of Aeolian-American at East Rochester, New York until 1985, when Aeolian went out of business.
A Weber bar is a device designed to detect gravitational waves, first devised and constructed by physicist Joseph Weber at the University of Maryland. The device consisted of aluminium cylinders, 2 meters in length and 1 meter in diameter , antennae for detecting gravitational waves .
A tournament is an orientation of a complete graph. A polytree is an orientation of an undirected tree. [2] Sumner's conjecture states that every tournament with 2n – 2 vertices contains every polytree with n vertices. [3] The number of non-isomorphic oriented graphs with n vertices (for n = 1, 2, 3, …) is
Coordinate charts are mathematical objects of topological manifolds, and they have multiple applications in theoretical and applied mathematics. When a differentiable structure and a metric are defined, greater structure exists, and this allows the definition of constructs such as integration and geodesics .