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Dual learning
Dual learning is a machine learning framework that jointly trains two related tasks, such as translating between two languages, so each improves the other from unlabeled data.
Dual licensing
Dual licensing is the practice of releasing the same work, usually software, under two licenses, typically a free license like the GPL plus a paid commercial one.
Dual modular redundancy
Dual modular redundancy (DMR) is a fault-tolerance technique that duplicates a module and compares outputs to detect errors, but cannot correct them without external recovery.
Dual SIM
Dual SIM is the capability of a single mobile device to hold and use two SIM subscriptions at once, giving the user two phone numbers on one handset.
Dual-actuator hard disk drive
A dual-actuator hard disk drive is a hard drive with two independent actuator assemblies, each moving its own read/write heads, so two areas of the disk can be accessed at once for roughly double the throughput.
Dual-Axis Radiographic Hydrodynamic Test Facility
The Dual-Axis Radiographic Hydrodynamic Test (DARHT) Facility at Los Alamos National Laboratory uses two perpendicular X-ray accelerators to image imploding mock nuclear weapon pits for stockpile stewardship.
Dual-clutch transmission
A dual-clutch transmission (DCT), also called a twin-clutch gearbox, is an automotive gearbox combining manual-transmission efficiency with automatic shift comfort, pre-selecting the next gear on a second clutch so shifts occur without traction interruption.
Dual-die and multi-die stacking
Dual-die and multi-die stacking is a semiconductor approach bonding dies or wafers vertically with through-silicon vias into 3D integrated circuits, best known for high-bandwidth memory and 3D NAND flash.
Dual-fuel combustion
Dual-fuel combustion is an engine method where a small diesel pilot ignites a premixed gaseous fuel such as natural gas, used widely in marine propulsion.
Dual-ion battery
A dual-ion battery is a rechargeable battery in which both electrolyte cations and anions intercalate into the electrodes, unlike the rocking-chair mechanism of lithium-ion cells.
Dual-mass flywheel
A dual-mass flywheel is a vehicle flywheel split into two masses connected by springs to filter engine vibration, developed by LuK and mass-produced from around 1985.
Dual-mode ramjet
A dual-mode ramjet, also called a dual-mode scramjet (DMS), is an air-breathing jet engine that runs with either subsonic or supersonic combustion, covering flight from about Mach 2 to beyond Mach 15.
Dual-phase steel
Dual-phase steel is an advanced high-strength steel with hard martensite islands in a soft ferrite matrix, giving high strength with good ductility for automotive parts.
Dual-phase titanium alloys
Dual-phase titanium alloys, usually called α + β titanium alloys, contain both the hexagonal α phase and the body-centered cubic β phase in their microstructure.
Dual-polarization 64-QAM
Dual-polarization 64-QAM (DP-64QAM, also written PDM-64QAM) is a coherent optical modulation format that transmits 64-state QAM on two polarizations, carrying 12 bits per symbol and reaching about 100 km.
Dual-source co-evaporation of perovskite
Dual-source co-evaporation of perovskite is a vacuum deposition method that forms perovskite thin films by evaporating two precursors simultaneously, used mainly for perovskite/silicon tandem solar cells.
Dual-sport motorcycle
A dual-sport motorcycle, also called dual-purpose or all-road, is a street-legal motorcycle usable both on pavement and off-road, typically with a 250 to 650cc single-cylinder engine.
Dual-tree complex wavelet transform
The dual-tree complex wavelet transform (DTCWT), introduced by N.G. Kingsbury in 1998, runs two real wavelet transforms in parallel, giving near shift invariance and six directional subbands in 2-D.
DualDisc
DualDisc is a two-sided music disc introduced by major record labels in 2004, pairing a CD album with DVD-Audio, videos, and other DVD content on one disc.
Duality (optimization)
Duality in optimization, notably Lagrangian duality, pairs a primal minimization problem with a dual maximization problem whose value bounds the primal and usually equals it for convex problems.
DualShock
The DualShock, also known as Sony DualShock, is a line of PlayStation game controllers by Sony defined by two analog sticks and vibration feedback, introduced in 1997.
Duane Arnold nuclear power plant
The Duane Arnold nuclear power plant is a single-unit boiling water reactor in Palo, Iowa, that operated from 1974 to 2020 and is planned to restart by 2029.
Duane Arnold Solar
Duane Arnold Solar, later renamed Pleasant Creek Solar, is a 200 MW solar farm with 75 MW of battery storage in Linn County, Iowa, completed in 2024.
Duane McRuer
Duane McRuer was an American control engineer who founded Systems Technology, Inc., made fly-by-wire controls practical at Northrop, and modeled the human pilot in control loops.
Dubai Airshow
The Dubai Airshow is a biennial aerospace, defense, and space trade show in Dubai, first held in 1989 and one of the industry's three major events.
Dubai Creek Tower
Dubai Creek Tower (برج خور دبي) is a planned observation tower at Dubai Creek Harbour, Dubai, designed by Santiago Calatrava to surpass the Burj Khalifa before its 2020 suspension.
Dubai Crude
Dubai Crude is a medium sour crude oil produced in Dubai whose Platts price assessment is the main benchmark for pricing Middle East Gulf crude exported to Asia.
Dubai Electricity and Water Authority
Dubai Electricity and Water Authority (DEWA; Arabic: هيئة كهرباء ومياه دبي) is the government-owned utility that is Dubai's exclusive provider of electricity and water, created in 1992.
Dubai International Airport (مطار دبي الدولي)
Dubai International Airport (مطار دبي الدولي) is the primary airport of Dubai and the world's busiest for international passengers since 2014, serving as the home hub of Emirates.
Dubai Metro (مترو دبي)
Dubai Metro, or مترو دبي, is a fully automated, driverless rapid transit network in Dubai, United Arab Emirates, opened in 2009 and operated by the Roads and Transport Authority.