All articles starting with D

Dens Park

Dens Park is a football stadium in Dundee, Scotland, home to Dundee Football Club since 1899. It opened in 1899 and features a main stand designed by Archibald Leitch.

Dense captioning

Dense captioning is a computer vision task in which a model both localizes regions of an image and captions each in natural language, introduced by Stanford researchers in 2015.

Dense mapping (SLAM)

Dense mapping is a SLAM approach that reconstructs a complete 3D model of an environment, assigning geometry to every observed pixel or voxel rather than tracking sparse features.

Dense passage retrieval

Dense passage retrieval, or DPR, is a retrieval method introduced by Facebook AI in 2020 that finds relevant text passages using neural embeddings instead of keyword matching.

Dense plasma focus

A dense plasma focus (DPF) is a pulsed plasma device whose coaxial accelerator compresses plasma into an extremely dense pinch, producing intense pulses of neutrons and x rays.

Dense set

A dense set, sometimes called an everywhere-dense set, is a subset of a topological space that intersects every nonempty open set, such as the rationals in the reals.

Dense wavelength-division multiplexing

Dense wavelength-division multiplexing (DWDM) is an optical fiber technique that carries many tightly spaced channels on a single fiber strand; it is the capacity workhorse of long-haul and submarine networks.

DenseNet

DenseNet, short for Dense Convolutional Network, is a convolutional neural network architecture in which each layer connects to every preceding layer, introduced in 2016 and recognized with a CVPR 2017 Best Paper Award.

Denshattack!

Denshattack! (also Denshattack) is a 2026 'train punk' trick-based 3D platformer by Undercoders, published by Fireshine Games and Boltray Games; 'Tony Hawk but you're a train', launched July 15, 2026 on PC, PS5, Xbox Series X|S and Switch 2, 88 Metacritic, 98% positive Steam reviews.

Sep 23, 2026

Denshawai Incident

The Denshawai Incident (حادثة دنشواي) was a violent 1906 clash between Egyptian villagers and British officers in the Nile Delta, followed by hangings that fueled Egyptian nationalism.

Oct 22, 2026

Denshūtai

The Denshūtai (伝習隊) was a Western-style elite unit formed by the Tokugawa shogunate in 1867 and trained by the first French military mission to Japan.

Densitometer

A densitometer is an instrument that measures how much light a material absorbs or blocks, used to control ink on printing presses and darkness of film.

Density

Density, also called mass density or volumetric density, is a material's mass divided by its volume, ρ = m/V, usually given in kg/m³ or g/cm³.

Density altitude

Density altitude is the altitude in the standard atmosphere at which air density matches the air at a given point, used by pilots as an index of aircraft performance.

Density estimation

Density estimation is the statistical task of recovering a probability density function from observed data, using parametric mixture models or nonparametric methods like kernel density estimation.

Density evolution

Density evolution is an analytical technique in coding theory that tracks the probability densities of messages exchanged by iterative decoders, predicting code ensemble performance and yielding the decoding threshold.

Density functional theory

Density functional theory (DFT) is a quantum-mechanical method for calculating the electronic structure of atoms, molecules, and solids using electron density rather than wave functions.

Oct 22, 2026

Density functional theory volcano plots for HER/OER

Density functional theory volcano plots are activity maps for the hydrogen and oxygen evolution reactions, plotting adsorption free energies from DFT against predicted rates or overpotentials.

Density functional tight binding

Density functional tight binding (DFTB) is an approximate quantum-chemical method deriving a tight-binding model from density functional theory, running roughly 100 to 1000 times faster at modest accuracy cost.

Density gradient centrifugation

Density gradient centrifugation is a laboratory method that separates cells, organelles, viruses, and macromolecules into visible bands by buoyant density or sedimentation rate, introduced by Myron K. Brakke in 1951.

Density index

The density index, also known as the Straube-Pfeiffer test or reduced pressure test, is a foundry quality-control number expressing, as a percentage, the gas porosity tendency of molten aluminum.

Density matrix

The density matrix, or density operator, is the most general description of a quantum state, covering both pure states and statistical mixtures; it was introduced by von Neumann and Landau in 1927.

Oct 22, 2026

Density matrix embedding theory

Density matrix embedding theory (DMET) is a quantum embedding method for computing ground-state properties of large quantum systems by dividing them into fragments, each solved as a small impurity problem.

Density matrix renormalization group

The density matrix renormalization group (DMRG) is a numerical algorithm introduced by Steven R. White in 1992 for computing ground states of quantum many-body systems.

Density modification

Density modification is a family of crystallographic methods for improving initial phase estimates by modifying an electron-density map through solvent flattening, histogram matching, and non-crystallographic symmetry averaging.

Density of air

Density of air, or air density, is the mass of Earth's atmosphere in a unit volume, about 1.225 kg/m³ at sea level, falling with altitude, temperature, and humidity.

Density of states

The density of states (DOS) is a function giving the number of available quantum states per unit energy interval, central to solid-state physics, semiconductors, and materials science.

Density parameter

The density parameter, written Ω (Omega), is the ratio of the actual mean density of the universe or a component to the critical density, and the components sum to 1.

Density peak clustering

Density peak clustering is a clustering algorithm, proposed by Rodriguez and Laio in Science in 2014, that finds cluster centers as points of high density far from denser points.