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Eng ID | Term | Definition |
---|---|---|---|
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5761 | ultra high frequency (UHF) | See FREQUENCY: RADIO. |
|
5762 | ultrashort wave | See WAVE. |
|
5763 | ultrasonic | (adj.). Having a FREQUENCY above the audible RANGE. |
|
5764 | ultrasonic depth finder | See ECHO SOUNDER. |
|
5765 | ultrasonics | The science and technology relating to SOUND WAVES of FREQUENCIES above the audible RANGE. |
|
5766 | ultraviolet | (adj.). Having a FREQUENCY immediately beyond the violet end of the visible SPECTRUM. Said of RAYS of shorter WAVE LENGTH than visible light... more |
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5767 | uncontrolled mosaic | A MOSAIC composed of uncorrected PRINTS, the detail of which has been matched from print to print without GROUND CONTROL or other ORIENTAT... more |
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5768 | uncovered | (adj.). Above water. The opposite is SUBMERGED. |
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5769 | uncovers | See COVERS AND UNCOVERS. |
|
5770 | undercliff | A TERRACE or lower CLIFF formed by a LANDSLIDE. Also written as two words. |
|
5771 | undercurrent | A CURRENT below the surface, particularly one flowing in a direction or at a SPEED differing from the SURFACE CURRENT. |
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5772 | underground mark | A STATION MARK set and plumbed below the centre of a SURFACE MARK and separated therefrom so as to preserve the STATION in case of accident ... more |
|
5773 | underkeel clearance | The distance (usually a required minimum distance) between the lowest point of a ship's hull and the SEABED. |
|
5774 | underkeel allowance | The minimum UNDERKEEL CLEARANCE estimated, or specified by a relevant authority for a defined area or vessel type, to account for vessels' s... more |
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5775 | undertow | A seaward FLOW near the BOTTOM of a sloping BEACH. The subsurface return by gravity flow of the water carried up on SHORE by WAVES or BREAKE... more |
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5776 | underwater acoustics | A special field of technical acoustics dealing with the physics of sound propagation in the water. |
|
5777 | underwater ice | See ANCHOR ICE. |
|
5778 | underwater navigation | See NAVIGATION. |
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5779 | underwater photogrammetry | See PHOTOGRAMMETRY. |
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5780 | underwater position fixing | A method of position fixing for surface vessels, submersibles or towed devices in relation to a network of underwater acoustic beacons on th... more |