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Diamond cut
Diamond cut is the quality of how a polished diamond's facets are arranged and proportioned, distinct from shape, and the factor that most determines its beauty.
Diamond DA62
The Diamond DA62 is a twin-engine, seven-seat light aircraft built by Diamond Aircraft Industries, certified by EASA in 2015 and powered by two Austro Engine AE330 jet-fuel piston engines.
Diamond Green Diesel
Diamond Green Diesel is a 50/50 joint venture of Valero Energy and Darling Ingredients producing renewable diesel at Gulf Coast plants in Louisiana and Texas since 2013.
Diamond grinding
Diamond grinding is a concrete pavement preservation technique, first used in California in 1965, that restores smoothness, friction, and noise levels by shaving a thin surface layer.
Diamond interchange
A diamond interchange is a road junction where diagonal ramps in all four quadrants connect a freeway to a surface street via a single bridge.
Diamond maser
A diamond maser is a microwave oscillator or amplifier using nitrogen-vacancy defect centers in diamond, first shown to operate continuously at room temperature and ambient pressure in 2018.
Diamond mining in Angola
Diamond mining in Angola is the extraction of diamonds, begun in 1912 and now led by the state company ENDIAMA, concentrated in the northeastern Lunda provinces.
Diamond Oil Pipeline (Memphis–Byhalia)
The Diamond Oil Pipeline is a 440-mile crude oil pipeline from Cushing, Oklahoma, to Valero's Memphis refinery, owned by Plains All American and Valero with a capacity of 200,000 barrels per day.
Diamond photonics
Diamond photonics builds optical devices, from waveguides to integrated circuits, out of single-crystal diamond, whose color centers serve as single-photon sources, spin qubits, and quantum memories.
Diamond Princess (ship)
Diamond Princess is a Grand-class cruise ship operated by Princess Cruises, built by Mitsubishi Heavy Industries in Nagasaki, Japan, in 2004 and known for the 2020 COVID-19 outbreak during quarantine at Yokohama.
Diamond Shamrock
Diamond Shamrock was an American oil refining and marketing company formed by the 1967 merger of Diamond Alkali and Shamrock Oil and Gas; Valero absorbed it in 2001.
Diamond transistor
A diamond transistor is a field-effect transistor whose channel is made of synthetic diamond, an ultra-wide-bandgap semiconductor suited to high power, high temperatures, and radiation; it remains at the research and early-commercialization stage.
Diamond turning
Diamond turning, formally single-point diamond turning (SPDT), is a precision machining process in which a lathe fitted with a diamond-tipped tool cuts optical-quality surfaces directly, without a subsequent polishing step.
Diamond wire sawing
Diamond wire sawing is a wafer-slicing process in which steel wire coated with fixed diamond abrasive cuts hard, brittle materials such as silicon, silicon carbide, and sapphire into wafers.
Diamond-copper composite
The diamond-copper composite, also called copper-diamond composite, is a metal-matrix composite of diamond particles in copper, combining diamond's high thermal conductivity and low expansion with copper's processability.
Diamond-like carbon
Diamond-like carbon (DLC) is an amorphous carbon coating whose diamond-like sp³ bonding gives high hardness (up to 3,000 HV) and low friction, deposited on tools, engine components, razor blades, and implants.
Diamond-like carbon coating
Diamond-like carbon (DLC) coating is a thin amorphous carbon film mixing diamond-like sp³ and graphite-like sp² bonds, combining hardness, low friction, and wear resistance in applications from automotive parts to razor blades.
Diana Sailplanes Diana
The SZD-56 Diana, also called the Diana 2, is a Polish high-performance racing sailplane in the FAI 15-meter flapped class, first flown in its modern form in 2005.
Diandong power station
Diandong power station (滇东电厂) is a coal-fired power complex in Qujing, Yunnan, China, operated by Huaneng Yunnan Diandong Energy, with two sites, Diandong and Yuwang, totaling 3,600 MW.
Diandong Yuwang power station
The Diandong Yuwang power station is a 1,200 MW coal-fired power station in Fuyuan County, Qujing, Yunnan, China, owned by Huaneng, with units commissioned in 2009 and 2010.
Dianne Chong
Dianne Chong is a retired American materials engineer who was Boeing's vice president of Research and Technology and was elected to the National Academy of Engineering in 2017.
Diantou power station
Diantou power station is a coal-fired power station of at least 1,320 MW in Diantou Town, Huangling County, Yan'an, Shaanxi, China, with its first phase commissioned in 2023.
Dianzuo Wang
Dianzuo Wang (Wang Dianzuo, 1934–2023) was a Chinese mineral processing scientist known for flotation theory and reagent design, a member of the Chinese and US engineering academies who died in 2023.
Diaphragm compressor
A diaphragm compressor is a reciprocating compressor in which a flexible metal diaphragm compresses gas without contamination, making it the standard choice for hydrogen refueling stations.
Diaphragm pump
The diaphragm pump, also called a membrane pump, is a positive displacement pump that moves fluid by flexing a flexible membrane, handling corrosive and hazardous media without leakage.
Diaphragm wall
A diaphragm wall is a continuous underground wall of abutting concrete panels excavated under bentonite slurry and filled with concrete, serving as basement walls, foundations, and seepage cutoffs.
Diatomaceous earth and perlite filtration media
Diatomaceous earth (diatomite, kieselguhr) and expanded perlite are the two principal mineral filter aids used as precoat or body feed in food, beverage, pharmaceutical, and chemical filtration, differing in bulk density, crystalline silica content, and trace metal leaching.
Dibang Multipurpose hydroelectric plant
The Dibang Multipurpose Project is a 2,880 MW hydroelectric and flood-moderation scheme on the Dibang river in Arunachal Pradesh, India, planned around India's highest dam and due in 2032.
Dibenzyltoluene
Dibenzyltoluene (DBT) is an aromatic hydrocarbon mixture used as a liquid organic hydrogen carrier, storing 6.2 wt% hydrogen that a catalyst releases at about 300 °C.
Dice (ticketing company)
DICE is a London-based mobile ticketing and event discovery platform for live music, founded in 2014 by Phil Hutcheon and ustwo, and acquired by Fever in 2025.