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U N I NSTA 11

To remove an application with all its elements in different folders from a computer or a disk drive,

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U-BOLTS

Bars bent into U-shape and threaded at each end: used for anchoring a semi-elliptic spring to an axle beam, a plate being threaded over the ends and secured by nuts.

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U-LINKS

The spring links used to join isolated sections of communication channels, the ends of which are brought to a special link-board. Removal of a link opens the circuit, so that test equipment can be rapidly inserted.

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U-MATIC

TN for an industrial composite format using % in tape in two sizes of cassette. There is also an upgraded superior performance SP version. Broadcast video U-matic BVU is a high-band. subbroadcast standard version, now in SP form,

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U-PACKING

A flexible annular ring of U-section and used to pack the glands of fluid power pistons, rams. The hollow of the U faces the pressure side so that the pressure expands the legs of the U, forming a seal. Modern designs use neoprene or similar and may have a toroidal spring in the arms of the U. Also U-leather.

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U-WRAP

Tape path on the drum of a helical scan VTR giving 180 contact. Fig. <]

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UART

Abbrev for universal asynchronous receiver/ transmitter.

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UBBELOHDE VISCOMETER

Type of viscometer used for measuring dilute solution viscosity of polymers. Consists of glass capillary and reservoir on which are enscribed two fixed marks. Held vertical, the solution is allowed to flow through the capillary from the reservoir, and the time for movement between the fixed marks recorded. This is repeated for several different concentrations, from which data, the intrinsic viscosity of the polymer can be calculated.

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UBBLE STABILIZATION

Tendency of polymer bubble blown after extrusion in manufacture of film to maintain a constant shape without breaking or collapsing. Depends on tension-stiffening behaviour of molten polymer. See Troutonian fluid

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UBIQUINONE

Small highly mobile electron carrier mediating the transfer of electrons from flavoprotein to cytochrome in the electron transfer chain.

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