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Over Bridge
Over Bridge is a single-arch stone bridge over the River Severn at Gloucester, England, built between 1825 and 1830 to a design by Thomas Telford.
Over-provisioning (flash memory)
Over-provisioning in flash memory is the reserve of NAND capacity in an SSD, invisible to the host, used by the controller for garbage collection and wear leveling.
Over-the-air testing
Over-the-air (OTA) testing is a wireless engineering method that evaluates antennas and radio devices by transmitting signals through free space in a controlled chamber, without cables.
Over-the-air update
An over-the-air (OTA) update is the remote delivery and installation of software, firmware, or configuration over a network without physical access, used in Android updates and standardized by the IETF for IoT devices.
Over-the-top media service
An over-the-top (OTT) media service is a video or audio application delivered over the public internet, bypassing the network operator, including Netflix, Disney+, YouTube, and free services like Pluto TV.
Overall equipment effectiveness
Overall equipment effectiveness (OEE), a manufacturing metric introduced by Seiichi Nakajima in 1988 within Total Productive Maintenance, multiplies availability, performance, and quality to expose downtime, speed, and defect losses.
Overclocking
Overclocking, also called OCing, is running a computer component such as a CPU or GPU faster than its factory-rated speed, improving performance at the cost of heat, power, and possibly the warranty.
Overconsolidation ratio
The overconsolidation ratio (OCR) in soil mechanics is the ratio of a soil's past maximum effective stress to its present overburden stress, distinguishing soils that have been unloaded.
Overconstrained mechanism
An overconstrained mechanism is a linkage with more kinematic constraints than the standard mobility count requires that still moves, since special geometric relationships among its joints make some constraints dependent.
Overcurrent protection
Overcurrent protection is a power system protection method in which a relay trips a circuit breaker when current exceeds a preset pickup value, after a fixed or inverse-time delay.
Overdrive (mechanics)
Overdrive (mechanics) is a transmission gear ratio below 1:1, so the output spins faster than the engine crankshaft, cutting RPM, noise, and fuel use on highways.
Overfire air
Overfire air (OFA) is a combustion modification that diverts 5 to 20 percent of a furnace's air to ports above the burners, reducing nitrogen oxide (NOx) formation.
Overfitting
Overfitting is a failure mode in machine learning where a model fits its training data, including random variation, so closely that it predicts poorly on new, unseen data.
Overflow spillway
An overflow spillway, or ogee spillway, passes flood water over the top of a dam on a crest shaped to match a falling water sheet.
Overhaul (maintenance)
An overhaul is a comprehensive maintenance process in which a machine is completely disassembled, cleaned, inspected, repaired, reassembled, and tested so it can return to service for a further period of operation.
Overhead camshaft engine
An overhead camshaft (OHC) engine mounts its camshafts in the cylinder head, close to the valves, allowing faster valve operation, higher engine speeds, and three or four valves per cylinder.
Overhead crane
An overhead crane is a crane with a movable bridge carrying a hoist on an overhead runway, the standard lifting machine of factories, steel mills, and power plants.
Overhead ground wire
An overhead ground wire, also called a shield wire, static wire, earth wire, or skywire, is a grounded conductor atop power lines that intercepts lightning strokes.
Overhead line
An overhead line, also called overhead contact system or overhead line equipment, is a system of energized wires that supplies electric power to moving trains through a pantograph, from trams to high-speed lines.
Overhead power line
An overhead power line, also known as a high tension line, carries electric power through conductors suspended above the ground on poles or towers, using air as insulation.
Overhead valve engine
An overhead valve (OHV) engine, also called a pushrod engine, is a piston engine with valves in the cylinder head operated by pushrods from a camshaft in the block.
Overland Pass NGL Pipeline
The Overland Pass Pipeline is a natural gas liquids pipeline carrying NGLs from Opal, Wyoming, to Conway, Kansas, owned equally by Williams and ONEOK and operated by Williams.
Overland telegraphy in colonial Africa
Overland telegraphy in colonial Africa was the landline telegraph networks built across the continent's colonies from the 1860s to the mid-twentieth century, serving imperial control more than commerce.
Overlay analysis
Overlay analysis is a geographic information system technique combining two or more spatial data layers, such as land use and soils, to identify areas meeting combined criteria.
Overlay metrology
Overlay metrology is the measurement of how precisely successive patterned layers of a semiconductor device are aligned, a critical process control step in chip manufacturing.
Overlay network
An overlay network is a virtual network built on top of another network, whose logical connections run over paths the underlying physical network forwards without understanding them.
Overleaf
Overleaf, also known as Overleaf.com, is a cloud-based real-time collaborative LaTeX editor created in 2011, owned by Digital Science, and widely used for academic writing.
Overlock
An overlock, also called merrow stitching, is a machine stitch that wraps thread around a fabric edge to prevent fraying while the seam is sewn.
Overmolding
Overmolding is an injection molding process in which a material such as rubbery TPE is molded onto a rigid part, adding grip or sealing without adhesives.
Overpressure ammunition
Overpressure ammunition, marked +P, is commercially loaded ammunition whose pressure exceeds the cartridge's standard maximum; SAAMI standardized it in 1974, with unstandardized +P+ above it.