All articles starting with D
24,034 articles
Discovery of the neutron
The discovery of the neutron was James Chadwick's 1932 demonstration that the penetrating radiation from bombarded beryllium was a new uncharged particle, the neutron, with a mass close to the proton's.
Discovery of the old-text classics in the wall of Confucius's residence
The discovery of the old-text classics (孔壁古文经) was the Western Han finding of pre-Qin texts in a wall of Confucius's house, made when Prince Gong of Lu demolished it.
Discovery of the Zacatecas silver mines
The discovery of the Zacatecas silver mines (Descubrimiento de las minas de Zacatecas) was the finding of rich silver veins by Juan de Tolosa in 1546.
Discovery of X-rays
The discovery of X-rays was made by German physicist Wilhelm Röntgen at the University of Würzburg on 8 November 1895, earning him the first Nobel Prize in Physics.
Discovery Program
The Discovery Program is a NASA planetary science program, created in 1992, funding competitively selected, principal-investigator-led missions like Pathfinder, Kepler, and InSight under a fixed cost cap.
Discovery Rupes
Discovery Rupes is a large lobate scarp, a thrust-fault cliff, in Mercury's southern hemisphere, over 500 km long with about 1.5 km relief, first imaged by Mariner 10 and named for Cook's ship HMS Discovery.
DisCoVeRy trial
DisCoVeRy (NCT04315948) was a French multicentre adaptive randomised trial of remdesivir, lopinavir/ritonavir, interferon beta-1a, and hydroxychloroquine in hospitalised COVID-19 adults, an add-on to WHO Solidarity; its hydroxychloroquine and lopinavir arms were stopped in 2020.
Discovery UNESCO Global Geopark
Discovery UNESCO Global Geopark, Bonavista Peninsula, Newfoundland and Labrador, Canada; designated 2020; one of five Canadian geoparks; named for the Discovery Trail and John Cabot's 1497 landfall; fossils of early complex life.
Discovery World
Discovery World names a Milwaukee, Wisconsin lakefront science museum with the Reiman Aquarium (opened 1982, lakefront 2006) and the 探索世界 land theme park of Taiwan's Lihpao Land Resort, home of the Vekoma Tilt Coaster Gravity Max.
Discovery Zone
Discovery Zone, the 1990s American pay-for-play children's indoor playground chain (FunCenters, SkyTubes, ball pits), grew from 8 to 300+ stores under Blockbuster, went bankrupt in 1996 and 1999, and closed in 2001.
Discovery, Inc.
Discovery, Inc., formerly Discovery Communications, was an American mass-media company founded by John Hendricks in 1982, known for Discovery Channel, HGTV, and TLC; it became Warner Bros. Discovery in 2022.
Discovery+
Discovery+ (discovery+) is a non-fiction and reality TV streaming service from Warner Bros. Discovery, launched January 4, 2021 with 55,000+ episodes from HGTV, TLC, Food Network, and ID; priced $6.99 to $11.99 monthly after the October 2026 increase, now under Skydance ownership.
Discrepancy theory
Discrepancy theory, also known as the theory of irregularities of distribution, is a branch of mathematics studying how evenly discrete objects can approximate balanced distributions, with roots in Hermann Weyl's work.
Discrete and causal approaches to quantum gravity
Discrete and causal approaches to quantum gravity are research programs replacing smooth spacetime with discrete, causally ordered structures, chiefly causal set theory and causal dynamical triangulations.
Discrete choice
Discrete choice, also known as discrete choice analysis, is the branch of econometrics that models decisions among a countable set of outcomes using random utility theory.
Discrete cosine transform
The discrete cosine transform (DCT), also called cosine transform, is a family of real-valued Fourier-related transforms, introduced in 1974, that underlies JPEG image and MP3 audio compression.
Discrete dipole approximation
The discrete dipole approximation (DDA), also called the coupled dipole method, is a numerical method in computational electromagnetics that computes how particles of arbitrary shape scatter and absorb light.
Discrete elastic rods
Discrete elastic rods (DER) is a numerical method, introduced at SIGGRAPH in 2008, for simulating slender elastic bodies such as hair strands, cables, and soft robot limbs.
Discrete element method
The discrete element method (DEM), also called the discrete element model, is a numerical simulation technique that computes the motion of large particle assemblies contact by contact.
Discrete event simulation
Discrete event simulation is a modeling method where a system's state changes only at discrete event times, used to estimate waiting times, throughput, and bottlenecks.
Discrete exterior calculus
Discrete exterior calculus, introduced in Anil Hirani's 2003 Caltech dissertation, translates differential forms and the exterior derivative onto simplicial meshes, with applications in computer graphics and electromagnetics.
Discrete Fourier transform
The discrete Fourier transform (DFT) is the form of Fourier analysis computed by computers, converting N samples into complex numbers giving the amplitude and phase of component sinusoids.
Discrete fracture network model
A discrete fracture network (DFN) model simulates fluid flow and transport through fractured rock by representing each fracture explicitly, used in nuclear waste safety and hydraulic fracturing.
Discrete fracture network modeling
Discrete fracture network (DFN) modeling is a geological simulation method representing fractured rock as explicit networks of individual fractures to predict fluid flow and solute transport.
Discrete geometry
Discrete geometry, also called combinatorial geometry, is the branch of geometry studying discrete arrangements of points, lines, polygons, and polyhedra, with applications in robotics, computer graphics, and crystallography.
Discrete Laplace operator
The discrete Laplace operator is a linear operator, usually a matrix, that plays the role of the Laplacian on graphs and grids, encoding connectivity and approximating partial differential equations.
Discrete logarithm
The discrete logarithm is the exponent x satisfying g^x = h in a finite group; recovering it from g and h secures the 1976 Diffie-Hellman key exchange.
Discrete mathematics
Discrete mathematics is the branch of mathematics studying objects with distinct, separated values rather than smoothly varying ones, centered on combinatorics, graph theory, logic, and the mathematical foundations of computing.
Discrete Mathematics (journal)
Discrete Mathematics is a peer-reviewed mathematics journal published by Elsevier that covers combinatorics and graph theory; it was founded in 1971 by North-Holland in Amsterdam.
Discrete papular lichen myxedematosus
Discrete papular lichen myxedematosus is a rare, chronic skin condition with small, symmetrical, flesh-colored mucinous papules on the limbs and trunk, without paraproteinemia or thyroid disease.