All articles starting with D
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Drill (music genre)
Drill is a hip hop subgenre that emerged on Chicago's South Side around 2012, defined by dark trap beats and graphic lyrics about street life and gangs.
Drill bit
A drill bit is a rotating cutting tool with cutting edges and helical flutes that remove chips, made in materials from carbon steel to cemented carbide.
Drill bit sizes
Drill bit sizes designate a twist drill's cutting diameter in four coexisting systems: fractional inch, number gauge, letter gauge, and metric, so a stock drill sits near almost any needed hole size.
Drill commands
Drill commands are standardized oral orders, usually a preparatory command plus a command of execution (e.g., "Forward, march"), governing military drill; governed by manuals like TC 3-21.5 and Canada's A-DH-201-000/PT-000.
Drill hall
A drill hall is a purpose-built building for training volunteer and reserve soldiers, a building type that began in Britain around 1859 and spread to almost every English town.
Drill Hall Library
Drill Hall Library at Chatham Maritime, Kent, is the shared library of the Universities at Medway (Greenwich, Kent, Canterbury Christ Church), housed in a Grade II listed 1902 Royal Navy drill hall, opened as a library in 2006.
Drill halls in Northern Ireland
Drill halls in Northern Ireland are purpose-built training buildings for Army volunteer forces, closely tied to the Ulster Volunteer Force and Ulster Special Constabulary after Partition.
Drill halls in Scotland
Drill halls in Scotland are purpose-built buildings for training the Army's volunteer forces, dating from about 1859; around 180 of roughly 350 built survive today.
Drill hole surveying and downhole orientation
Drill hole surveying and downhole orientation measure a borehole's inclination and azimuth with depth to reconstruct its three-dimensional path, and determine the in-hole direction of core features.
Drill instructor
Drill instructor: US Marine Corps title for the NCOs who turn civilians into recruits' service members during basic training; Army calls them drill sergeants, Air Force MTIs, Navy RDCs, Coast Guard company commanders.
Drill purpose rifle
Drill purpose rifle: an inert rifle for drill training. Covers British L59A1/L59A2 Lee-Enfield DP conversions (1970s–1980s Cadet Forces) and non-firing M1903 Springfield replicas used in US JROTC armed drill.
Drill stem test
A drill stem test (DST) is a well test that isolates a formation with packers so its pressure, fluids, and productivity can be measured before a well is completed.
Drill team
Drill team: synchronized precision-movement performing and competitive groups, spanning JROTC military drill, dance/drill teams (founded via Kilgore Rangerettes, 1940), and equestrian drill; styles include military, high-kick, pom, jazz, hip-hop.
Drillbit Taylor
Drillbit Taylor is a 2008 American teen comedy where three bullied high school freshmen hire a homeless drifter, played by Owen Wilson, as their bodyguard.
Drilliidae
Drilliidae (Olsson, 1964) is a family of venomous predatory sea snails in superfamily Conoidea, formerly lumped in the polyphyletic "turrids"; synonym Clavidae; about 45 genera including Drillia and Clavus; sandy-substrate marine predators.
Drilling
Drilling is the process of making a cylindrical hole with a rotating cutting tool, covering machining with twist drills and well drilling for water and energy.
Drilling and blasting
Drilling and blasting, also called drill and blast, is a rock excavation method that fragments rock with explosives in boreholes, used widely in tunnels and mining.
Drilling fluid
Drilling fluid, also called drilling mud, is the circulating fluid used in rotary drilling of wells to clean the hole, carry cuttings to the surface, and counterbalance formation pressure.
Drilling rig
A drilling rig, or drill rig, is the machine used to drill a wellbore for oil, gas, or geothermal resources, combining hoisting, rotating, and circulating systems on land or offshore.
Drilling riser
A drilling riser is the large-diameter pipe connecting a floating drilling vessel to the subsea blowout preventer on the seafloor, returning drilling mud to the surface.
Drillinginfo (Drilling Info Holdings, Inc.)
Drillinginfo was an Austin, Texas-based SaaS data and analytics company serving the energy industry. Founded by Allen Gilmer and co-founders, it launched in 2000 and was renamed Enverus in 2018.
Drillship
A drillship is a maritime vessel modified with a drilling rig and station-keeping equipment, held on location by anchors, thrusters, or both, for drilling in deep water.
Drilon Vallis
Drilon Vallis is an IAU-approved valley on Mars in Xanthe Terra, centered at 7.22N, 307.60E, about 94 km across, named in 1985 after the classical name of Albania's Drin River and interpreted as a groundwater-sapping valley.
Drimia maritima
Drimia maritima, maritime squill or sea onion (syn. Urginea maritima, Scilla maritima), is a Mediterranean bulbous geophyte with toxic bufadienolide glycosides; white squill is medicinal, red squill (scilliroside) a rodenticide.
Drimys
Drimys (canelo, winter's bark) is a genus of seven vessel-less evergreen Winteraceae trees and shrubs native from Mexico to southern South America, described by the Forsters in 1776, with Australasian species split off into Tasmannia.
Drina Banovina
Drina Banovina (Дринска бановина) was a province of the Kingdom of Yugoslavia from 1929 to 1941, centered on the Drina river and administered from Sarajevo.
Drina Wolves (Вукови са Дрине)
Drina Wolves (Вукови са Дрине, Vukovi sa Drine), elite Podrinje Detachment of the VRS Zvornik Brigade, 1992–1995; about 360 men under Milan Jolović "Legenda"; Drina Corps assault unit in the July 1995 Srebrenica operation.
Drinabant
Drinabant, also known as AVE1625, is an investigational CB1 receptor antagonist developed by Sanofi, tested in phase 2 trials for Alzheimer's disease and schizophrenia without approval.
Drinfeld center
The Drinfeld center of a monoidal category is a braided monoidal category whose objects are pairs with half-braidings, the categorical counterpart of Drinfeld's quantum double of a Hopf algebra.
Drinfeld double
The Drinfeld double, also called the quantum double, is a Hopf algebra built from a Hopf algebra and its dual, introduced by Vladimir Drinfeld in 1986.