The ratio of the intensity of sound radiated directly from a source to the intensity of sound reverberating from the material.
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Related Terms |
GEARBOX
A system of gears which alter the ratio between the revolution of the engine and the propeller shaft so the propeller operates in a relatively efficient speed range. By using a gearbox the engine and the propeller shaft will revolve at different speeds. |
AMPLIFICATION
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DIRECTIVITY FACTOR
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FORM FACTOR
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POISSON RATIO
The ratio of the transverse contracting strain to the elongation strain when a rod is stretched by forces which are applied at its ends and which are parallel to the rod's axis.
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PLATE MODULUS
The ratio of the stress component Txx in an isotropic, elastic body obeying a generalized Hooke's law to the corresponding strain component Sxx, when the strain components Syy and Szz are 0; the sum of the Poisson ratio and twice the rigidity modulus.
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PLANT FACTOR
The ratio of the average power load of an electric power plant to its rated capacity. Also known as capacity factor.
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PHOTOELECTRIC CONSTANT
The ratio of the frequency of radiation causing emission of photoelectrons to the voltage corresponding to the energy absorbed by a photoelectron; equal to Planck's constant divided by the electron charge.
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PHASE MARGIN
The difference between 180 and the phase of the loop ratio of a stable system at the gain-crossover frequency.
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PERFORMANCE INDEX
The ratio of standard hours to the hours of work actually used; a ratio exceeding 1.00 (or 100) indicates subsoil and rocks in which the contained water is permanently frozen.
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