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Digital subcarrier multiplexing
Digital subcarrier multiplexing (DSCM), also written DSM, is a coherent optical technique that divides a data stream into digitally generated subcarrier channels with lower symbol rates and greater dispersion tolerance.
Digital subscriber line
Digital subscriber line (DSL) is a family of technologies, collectively xDSL, that carries broadband data over telephone copper lines at the same time as voice calls.
Digital television
Digital television (DTV), or digital TV, transmits television sound, pictures, and data digitally, fitting more channels into the same spectrum, supporting high-definition pictures, and showing a cliff effect at weak signals.
Digital Terrestrial Multimedia Broadcast
Digital Terrestrial Multimedia Broadcast (DTMB) is China's national standard for terrestrial digital television broadcasting, defined by standard GB 20600-2006 and mandatory since 2007, used in China, Hong Kong, Macao, Cuba, and Pakistan.
Digital terrestrial television
Digital terrestrial television (DTT) is television broadcasting delivered to rooftop or indoor aerials by ground-based transmitters using digital signals, replacing analog broadcasting through a worldwide switchover begun around 2000.
Digital Thread
A digital thread is a connected flow of product and process data spanning a manufactured item's entire lifecycle, from design through production, maintenance, and end of life.
Digital transformation
Digital transformation is the economic and societal change produced when organizations use digital technologies to alter value propositions, business models, and ways of working, not just convert analog data.
Digital twin
A digital twin is a virtual representation of a physical object, process, or system kept synchronized with its real-world counterpart by data flows and able to feed decisions back.
Digital video
Digital video is moving imagery represented as sequences of digitally encoded pictures, compressed by codecs like H.264 and stored in containers such as MP4 or WebM.
Digital video recorder
A digital video recorder (DVR), also known as a personal video recorder or PVR, records live digital television to a hard drive rather than tape, replacing the VCR.
Digital Visual Interface
Digital Visual Interface (DVI) is a video interface standard introduced in 1999 to carry uncompressed digital video from a computer to a monitor or projector.
Digital volume correlation
Digital volume correlation (DVC) is an image-based technique measuring internal 3D displacement and strain fields in opaque materials and tissues, typically from X-ray CT images.
Digital-to-analog converter
A digital-to-analog converter, also known as a DAC or D-to-A, is a device that converts digital codes into an analog voltage or current proportional to each code's numeric value.
DIGITALEUROPE
DIGITALEUROPE, formerly EICTA until its 2009 renaming, is a Brussels-based trade association for Europe's digital technology industries, representing 137 corporations and 45 national trade associations across 35 countries.
DigitalGlobe
DigitalGlobe, originally EarthWatch Incorporated, was an American commercial provider of high-resolution Earth-imagery products, operating its own imaging satellites and acquired by Maxar Technologies in 2017.
DigitalOcean
DigitalOcean is an American cloud computing provider founded in 2012 that offers Linux virtual machines, managed Kubernetes, databases, and object storage to developers and startups, going public in 2021.
Digitization
Digitization is the conversion of analog material, such as a photograph or paper document, into digital form by sampling and quantization, also used for creating digital library collections.
DIgSILENT PowerFactory
DIgSILENT PowerFactory is a commercial power system analysis software for modeling generation, transmission, distribution, and industrial electrical networks, developed by DIgSILENT GmbH in Gomaringen, Germany.
DIII-D
DIII-D is a tokamak fusion research facility in San Diego, California, operated by General Atomics and the largest magnetic fusion experiment in the United States.
Dijkstra's algorithm
Dijkstra's algorithm finds shortest paths from a source node to every other node in a graph with non-negative edge weights, conceived by Edsger W. Dijkstra in 1956.
Dike ring
A dike ring (dijkring) is a closed system of dikes, dunes, dams, or high ground in the Netherlands protecting an area from flooding as one unit.
Diketopyrrolopyrrole polymers
Diketopyrrolopyrrole (DPP) polymers are π-conjugated donor–acceptor copolymers built from a strongly electron-accepting lactam core, first a pigment in the 1970s and now standard in organic solar cells, transistors, and LEDs.
DIKW pyramid
The DIKW pyramid, also called the knowledge hierarchy, is a model arranging data, information, knowledge, and wisdom in a rising sequence, each level built from the one below.
Dilbar (yacht)
Dilbar is a 156-meter motor yacht built by German shipyard Lürssen and delivered in 2016, the largest motor yacht in the world by volume, though not the longest.
Dildo
A dildo is a sex toy shaped like a penis, used for sexual pleasure through penetration or external stimulation, typically made of silicone, glass, or metal.
Dileep George
Dileep George is an AI researcher who co-founded Numenta and Vicarious, created the Recursive Cortical Network vision model that broke text CAPTCHAs, and now leads AI at the Astera Institute.
Dilip Chhabria
Dilip Chhabria, born around 1953, is an Indian car designer who founded DC Design in 1993 and created the DC Avanti, marketed as India's first sports car.
Dilly Knox
Dilly Knox, born Alfred Dillwyn Knox, was a British codebreaker who served in Room 40 and led Enigma research at Bletchley Park until his death in 1943.
Dilute acid pretreatment
Dilute acid pretreatment is a biomass pretreatment method that heats lignocellulosic material with dilute sulfuric acid to hydrolyze hemicellulose, making cellulose accessible to enzymes for ethanol production.
Dilute ammonia pretreatment
Dilute ammonia pretreatment is a chemical pretreatment for lignocellulosic biomass in which dilute aqueous ammonia selectively removes lignin, increasing fermentable sugar release for ethanol production.