All articles starting with Q
2,252 articles
Quasistatic loading
Quasistatic loading is a mechanical testing method in which load is applied slowly enough that inertial forces are negligible, producing the stress-strain curves, strengths, and moduli against which higher-rate behavior is compared.
Quasistatic process
A quasistatic process, also called a quasi-equilibrium process, is an idealized thermodynamic process in which the system stays in equilibrium at each instant, so its work can be computed.
Quatermass (TV serial)
Quatermass is a British TV science-fiction franchise written by Nigel Kneale: The Quatermass Experiment (1953), Quatermass II (1955), Quatermass and the Pit (1958-59), and Quatermass (ITV 1979), plus Hammer film adaptations.
Quatermass 2
Quatermass 2 (US title Enemy from Space) is a 1957 Hammer science fiction horror film directed by Val Guest, starring Brian Donlevy, adapted by Nigel Kneale from his 1955 BBC serial about alien infiltration via a secret government complex.
Quatermass and the Pit
Quatermass and the Pit is Nigel Kneale's 1958-59 BBC serial, third in the Quatermass series, in which a Martian spaceship dug up in London reveals aliens shaped human evolution; adapted by Hammer in 1967 as Five Million Years to Earth.
Quatermass and the Pit (film)
Quatermass and the Pit (US: Five Million Years to Earth) is Hammer's 1967 British sci-fi horror film directed by Roy Ward Baker, written by Nigel Kneale, starring Andrew Keir, about a Martian craft unearthed in London.
Quaternary
The Quaternary is the current geological period, covering the past 2.58 million years and defined by glacial cycles, human evolution, and the extinction of large mammals.
Quaternary ammonium and amine N-oxide chemistry
Quaternary ammonium and amine N-oxide chemistry covers two nitrogen functional groups whose nitrogen carries a full or near-full positive charge, comparing their bonding, preparation, properties, and applications.
Quaternary ammonium cation
The quaternary ammonium cation is a permanently positive polyatomic ion with a central nitrogen bonded to four organic groups; its salts, called quats, serve as disinfectants and surfactants.
Quaternary ammonium compounds
Quaternary ammonium compounds (QACs, also called quats) are organically substituted ammonium salts used since the 1930s as disinfectants, antiseptics, and surfactants in many products.
Quaternary fatty ammonium salts and esterquats
Quaternary fatty ammonium salts and esterquats are quaternary ammonium compounds with long fatty alkyl chains, used mainly as fabric softeners, hair conditioners, and antistatic agents.
Quaternary glaciation
Quaternary glaciation: the ongoing ice age of the last 2.58 million years, marked by 41-kyr then ~100-kyr glacial–interglacial cycles, Northern Hemisphere ice sheets, the Mid-Pleistocene Transition at ~900 ka, and the current Holocene interglacial.
Quaternary Ice Age divisions
The Quaternary Ice Age divisions are the glacial and interglacial subdivisions of the Pleistocene, classically the four Alpine ice ages Günz, Mindel, Riss, and Würm.
Quaternion
Quaternions, also called Hamiltonian quaternions, are four-dimensional numbers discovered by William Rowan Hamilton in Dublin in 1843, now the standard way to represent 3D rotations without gimbal lock.
Quaternion group
The quaternion group Q8 is the eight-element nonabelian group of unit quaternions, one of the two nonabelian groups of order 8, alongside the dihedral group D4.
Quaternion kinematics
Quaternion kinematics is the use of unit quaternions, four-parameter numbers with one unit-length constraint, to represent rigid-body orientation in robotics, aerospace, and computer graphics, avoiding the singularities of Euler angles.
Quaternions and spatial rotation
Quaternions and spatial rotation is the use of quaternions, four-dimensional numbers invented by William Rowan Hamilton in 1843, to represent rotations of objects in three-dimensional space.
Quatrain
Quatrain: a four-line stanza or poem, from French quatre; the most common English stanza form, with schemes ABAB, ABBA, AABB, ABCB, AABA, used in ballads, hymns, sonnets, and the Persian robāʿī.
Quatre sept
Quatre sept, also known as La Politaine or La Poule, is a four-player partnership trick-taking card game from French-speaking Canada, adapted from the Italian game Tressette.
Quattro (four-wheel-drive system)
Quattro is Audi's permanent all-wheel-drive system, first shown in 1980 in the original Audi quattro, whose rally successes from 1981 made four-wheel drive the standard in top-level rallying.
Quattro Hong Kong 2
Quattro Hong Kong 2 (香港四重奏 II) is a 2011 Hong Kong omnibus of four shorts by Apichatpong Weerasethakul, Brillante Mendoza, Ho Yuhang, and Stanley Kwan, commissioned by Brand Hong Kong and premiered as an opening film of the 35th HKIFF.
Quattro robot
The Quattro robot, commercialized from the Par4 mechanism patented in 2003, is a four-arm parallel delta-type robot by Adept Technology and OMRON for high-speed packaging and food handling.
Quavers
Quavers are British cheese-flavored snacks made from potato starch and shaped into wavy curls, launched by Smiths in 1968 and produced by Walkers, a PepsiCo company.
Quavo
Quavo (Quavious Keyate Marshall), Atlanta-area rapper and Migos leader with Takeoff and Offset; solo albums QUAVO HUNCHO, Rocket Power, and the 2026 Pharrell-executive-produced QRÖMELIFE; founded the Rocket Foundation after Takeoff's 2022 death.
Quavonlimab
Quavonlimab (MK-1308) is Merck's investigational humanized IgG1 anti-CTLA-4 monoclonal antibody, tested with pembrolizumab (coformulation MK-1308A) in lung cancer, melanoma, renal cell and colorectal cancer trials.
Quay of Karnak
The Quay of Karnak, also Karnak Quay, is a stone quay and embankment wall at Karnak's temple of Amun-Re in Luxor, Egypt, inscribed with Nile flood records.
Quay of Taharqa
The Quay of Taharqa, also known as Taharqa's Quay at Karnak, is a stone Nile embankment at Karnak built by pharaoh Taharqa, dated to 685/4 BC.
Quay wall
A quay wall is a vertical waterfront retaining structure along which ships berth, retaining the ground behind a berth line so cargo and passengers can be loaded and discharged.
Quayola
Quayola, born Davide Quayola in Rome in 1982, is an Italian digital artist who re-imagines classical art through custom software, winning Ars Electronica's Golden Nica in 2013.
Quazepam
Quazepam (Doral) is a long-acting Schedule IV benzodiazepine hypnotic for insomnia, US-approved 1985 and relaunched 2016; half-life 27-41 hours, α1-GABA-A selective, dosed 7.5-15 mg.