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Dotmatics
Dotmatics is a scientific research software company, founded in 2005 by two Merck scientists, providing a cloud platform for managing and analyzing laboratory data in the life sciences.
Dots per inch
Dots per inch (DPI), often abbreviated dpi, is a measure of printing resolution counting the ink or toner dots a printer places in one linear inch.
Doubao
Doubao (豆包) is ByteDance's AI assistant app and the consumer product of its proprietary large language models, launched in August 2023 and China's most popular AI app.
Doubao (豆包) (assistant)
Doubao (豆包) is a consumer AI assistant app developed by ByteDance, released in China in August 2023 and the country's most-used AI chatbot by mid-2026.
Doubao / Seed (model family)
Doubao / Seed is ByteDance's large language model family, developed by its Seed research line, sold through Volcano Engine, and powering China's most-used consumer AI assistant, the Doubao app.
Doubao voice models
The Doubao voice models are a family of speech models built by ByteDance's Seed team for real-time spoken interaction, including the end-to-end Realtime Voice Model launched in January 2025.
Double (robot)
The Double is a two-wheeled, self-balancing telepresence robot by Double Robotics of California, first sold in 2012, letting a remote user see, hear, and drive.
Double Asteroid Redirection Test
The Double Asteroid Redirection Test (DART) was a NASA planetary defense mission that crashed a spacecraft into the asteroid Dimorphos in September 2022, shortening its orbit around Didymos.
Double bottom
A double bottom is a ship hull built with two layers of bottom plating, the space between serving as tanks for ballast, fuel, or fresh water.
Double buffering
Double buffering is a technique using two buffers, one read or displayed while the other is written; in graphics, it prevents flicker and tearing in animation.
Double coding
Double coding is a concept in architectural theory introduced by Charles Jencks in 1977, holding that a postmodern building addresses experts and the general public at once.
Double containment
Double containment is a nuclear reactor design with two concentric walls enclosing the reactor, used in French 1300 MWe and N4 reactors and the EPR.
Double Decker Express
The Double Decker Express is a class of Indian Railways express trains with air-conditioned double-decker coaches seating passengers on two levels, introduced from October 2011.
Double deep Q-learning
Double deep Q-learning (Double DQN) is a reinforcement learning algorithm that reduces overestimation of action values by selecting the greedy action with the online network but evaluating it with the target network.
Double deep Q-network
The double deep Q-network, or double DQN, is a reinforcement learning algorithm that reduces overestimation of action values in tasks such as playing Atari games.
Double descent (machine learning)
Double descent is a machine learning phenomenon in which test error follows the classical U-shaped curve, peaks at the interpolation threshold, then falls again with overparameterization.
Double H Pipeline
The Double H Pipeline is a 485-mile crude oil pipeline from Dore, North Dakota, to Guernsey, Wyoming, opened in 2015 and owned by Kinder Morgan.
Double hull
A double hull is a ship hull made of two watertight steel layers separated by a space, mandated on oil tankers because oil spills require breaching both layers.
Double machine learning
Double machine learning, also known as debiased machine learning, is a statistical method for estimating treatment effects using machine learning, introduced by Victor Chernozhukov and colleagues in 2018.
Double penetration dildo
A double penetration dildo, also called a double-ended dildo or double dildo, is a sex toy with insertable ends at both tips, usable solo or by two partners.
Double Q-learning
Double Q-learning is a reinforcement learning algorithm that uses two value estimators to remove the overestimation bias of Q-learning, introduced by Hado van Hasselt in 2010.
Double Ratchet Algorithm
The Double Ratchet Algorithm, also known as the Axolotl ratchet, is a key-management algorithm for end-to-end encrypted messaging that derives a fresh key for every message, securing Signal, WhatsApp, and Facebook Messenger.
Double Rayleigh scattering
Double Rayleigh scattering, also called double Rayleigh backscattering (DRB), is noise in optical fiber Raman amplifiers in which signal light backscattered twice returns as in-band crosstalk, limiting gain in long-haul systems.
Double shield TBM
A double shield TBM (DS TBM) is a hard-rock tunnel boring machine combining an open gripper TBM and a single-shield TBM, switching thrust modes as ground conditions change.
Double Star (satellite)
Double Star (Tan Ce, "Explorer") was a joint China-ESA mission of two satellites, TC-1 and TC-2, launched in 2003 and 2004 to study Earth's magnetosphere with Cluster.
Double wishbone suspension
Double wishbone suspension, also called double A-arm or SLA suspension, is an independent suspension using two wishbone-shaped control arms per wheel, first used in the 1930s by Citroën.
Double-barreled shotgun
A double-barreled shotgun is a smoothbore long gun with two barrels arranged side by side or over and under, typically break action, dominant for roughly a century and a half.
Double-crank linkage
A double-crank linkage, also called a drag-link mechanism, is a planar four-bar linkage whose two frame-hinged links rotate fully, converting one continuous rotation into another, non-uniform one.
Double-curvature arch dam
A double-curvature arch dam is a concrete arch dam curved both horizontally and vertically into a bowl shape, which lets designers build it thinner than other concrete dams.
Double-deck aircraft
A double-deck aircraft is an airliner with two passenger decks; only the Boeing 747, with a partial upper deck, and the Airbus A380 entered wide service.