Construct · 3 fields · 3 citations
One name. Different field. Different construct. One map.
● jingle · one word, three constructs Nearest construct by meaningfracturecompare the meaningsEvery construct on the map is compared with every other by the meaning of its definitions, and the closest one is surfaced here. The nearest construct to aperture is fracture.
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In radio astronomy, aperture synthesis builds a large effective aperture out of many small antennas, or one antenna moved to many positions, by combining their signals so that the system resolves fine detail as if it were a single dish the size of the whole array. The angular resolution of any telescope improves as its aperture grows, so synthesizing a wide aperture is how radio astronomers see sharply at long wavelengths. Ryle and Hewish's 1960 The Synthesis of Large Radio Telescopes set out the method, work for which Ryle later shared a Nobel Prize. This aperture is not a physical opening at all but an effective, reconstructed size, and it differs from the light-admitting hole in a camera, the open width of a rock fracture, and the opening of the vocal tract in speech.[1]
In structural geology and hydrogeology, the aperture of a fracture is the width of the open gap between its two rock walls, the distance that sets how easily fluid can flow through the crack. Because flow through a smooth opening rises with the cube of that width, small changes in aperture change the permeability of fractured rock enormously. Witherspoon, Wang, Iwai, and Gale's 1980 study of the cubic law measured flow through fractures with apertures down to fractions of a micrometre and confirmed this steep dependence. Here the aperture is a physical gap in solid rock, measured as a length, and it has nothing in common with a camera's light-admitting stop, a radio array's synthesized collecting area, or the openness of the vocal tract.[2]
In linguistics, aperture is the degree to which the vocal tract is open as a speech sound is made: sounds run from a complete closure, as in a [p] or [t], through progressively more open articulations up to a fully open vowel like [a]. Saussure's 1916 Course in General Linguistics ranked sounds on a scale of aperture, from aperture zero for a full stop up to the widest opening, and used that ranking to explain how syllables are built. Here the aperture is a property of how a person shapes the mouth and throat while speaking, described as a degree rather than a measured length, and it is unrelated to the opening in a camera, the synthesized aperture of a radio telescope, or the gap in a rock fracture.[3]
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