All articles starting with D
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Depression
Depression: in geography, land lower than its surroundings (Dead Sea, Qattara, cryptodepressions); in meteorology, a mid-latitude low-pressure weather system with fronts.
Depression (mood)
Depression (depressive disorder) is a common mental disorder involving persistent depressed mood or loss of interest for at least two weeks; about 322 million people affected, more common in women, treatable with psychotherapy and antidepressants.
Depression Anxiety Stress Scales
The Depression Anxiety Stress Scales (DASS) are public-domain self-report questionnaires measuring depression, anxiety, and stress over the past week, published by P.F. Lovibond and S.H. Lovibond in 1995.
Depression glass
Depression glass: inexpensive American machine-pressed colored tableware, roughly 1920s to early 1940s, made by firms like Hocking, Federal, and Hazel-Atlas, given away as premiums, and widely reproduced since the 1980s.
Depression of 1882-1885
The Depression of 1882-1885 was an American economic downturn, dated from March 1882 to May 1885, that began without a financial panic and prompted the first investigation by the US Bureau of Labor.
Depression of 1920-1921
The Depression of 1920-1921 was a sharp, brief postwar deflationary slump in the United States, an 18-month contraction the NBER dates from January 1920 to July 1921.
Deprogramming
Deprogramming: coercive 1970s-1990s American anti-cult practice of abducting and counterindoctrinating cult members, justified by brainwashing theory, later replaced by voluntary exit counseling after lawsuits ended the Cult Awareness Network.
Deprotection of silyl ethers
Deprotection of silyl ethers is the removal of a silyl protecting group to regenerate a masked alcohol, most commonly using fluoride ion such as TBAF.
DEPT (NMR)
DEPT (Distortionless Enhancement by Polarization Transfer) is a carbon-13 NMR experiment, introduced in 1982, that determines how many hydrogens attach to each carbon while suppressing quaternary carbons.
Dept. Q
Dept. Q is a Netflix British crime drama created by Scott Frank, adapted from Jussi Adler-Olsen's Department Q novels. Matthew Goode stars as DCI Carl Morck in an Edinburgh cold case unit; Season 1 premiered May 29, 2025, renewed for Season 2.
Deptford
Deptford is a district in the London Borough of Lewisham, south-east London, on the Thames at Deptford Creek. Known for its Royal Dockyard founded by Henry VIII in 1513 and closed in 1869, and today a designated Opportunity Area.
Depth (ring theory)
Depth, also called the depth of a module or of a local ring, is an invariant of commutative algebra measuring the length of a maximal regular sequence on a module.
Depth and Complexity
Depth and Complexity is a curriculum differentiation framework of eleven icon-based thinking prompts, developed in the 1990s for gifted education and now used in thousands of schools.
Depth Anything
Depth Anything is a family of monocular depth estimation foundation models, first released in January 2024, that predicts a depth map for a whole scene from one photograph.
Depth charge
A depth charge, also called a depth bomb, is an anti-submarine weapon dropped from ships or aircraft that detonates at a preset depth to destroy submerged submarines.
Depth completion
Depth completion is the computer vision task of generating a dense pixel-wise depth map from sparse LiDAR or RGB-D measurements, used in autonomous driving, robotics, and augmented reality.
Depth hoar
Depth hoar, also called sugar snow, is a layer of weak, cup-shaped ice crystals that forms at the base of the snowpack and drives persistent slab avalanches.
Depth interview
A depth interview, also called an in-depth interview or IDI, is a one-on-one qualitative research conversation using open-ended questioning and probing to explore a participant's experiences, motivations, and beliefs.
Depth of discharge
Depth of discharge (DoD) is the percentage of a battery's rated capacity removed during a discharge, the complement of state of charge, and a central factor in cycle life.
Depth of field
Depth of field is the range of object distances rendered acceptably sharp by a lens, set by aperture, focal length, subject distance, and the acceptable circle of confusion; includes hyperfocal distance, sensor-size effects, focus stacking, and synthetic smartphone bokeh.
Depth of focus
Depth of focus (DOF) in optical lithography is the range of focus errors a process can tolerate while printing features within specification, a key constraint in semiconductor manufacturing.
Depth perception
Depth perception is the visual ability to judge distances in space using monocular cues (relative size, occlusion, perspective, motion parallax) and binocular cues (retinal disparity, convergence). Stereopsis, Wheatstone's 1838 stereoscope, cortical disparity detectors, clinical testing, and 3D displays distinguish it from related topics.
Depth profiling
Depth profiling is an analytical technique that measures how a material's elemental composition changes with depth, sputtering away surface layers to yield concentration-versus-depth curves for thin films and buried interfaces.
Depth sounding
Depth sounding is the measurement of water depth, historically by weighted lead line and today mostly by timing sound or laser pulses from the seafloor.
Depth-first search
Depth-first search (DFS), also called depth-first traversal, is a graph traversal algorithm that explores one path deeply before backtracking, and underlies cycle detection and topological sorting.
Depth-graded multilayer coating
A depth-graded multilayer coating is a thin-film optical structure in which alternating layer thicknesses vary through the stack, letting one coating reflect a broad band of X-rays at a single incidence angle.
DEPTHX
DEPTHX (DEep Phreatic THermal eXplorer) was a NASA-funded autonomous underwater vehicle built by Stone Aerospace to map flooded Mexican sinkholes as a prototype for exploring Jupiter's moon Europa.
Depurination
Depurination is the hydrolytic loss of a purine base (adenine or guanine) from DNA, creating about 10,000 abasic sites per human cell each day, repaired by base excision repair.
Deputy
Deputy: a person appointed to act for a superior officeholder. Covers Canadian deputy ministers, UK deputy prime minister, South African and Kenyan deputy presidents, US vice president, and deputy mayors, with appointment, delegated powers, and accountability.
Deputy (TV series)
Deputy is an American police procedural drama series that aired on Fox from 2020. It follows Bill Hollister, a deputy who becomes acting sheriff under an arcane county charter rule.