42,772 articles
mpmath
mpmath is a free, BSD-licensed Python library for arbitrary-precision real and complex floating-point arithmetic, created by Fredrik Johansson in 2007 and serving as the numerical evaluation engine for SymPy.
Mponeng Gold Mine
Mponeng Gold Mine is an underground gold mine near Carletonville, South Africa, described by its operators as the deepest mine in the world, operating down to about 3,740 m below surface.
MPTP
MPTP is a synthetic neurotoxin that causes permanent Parkinson's disease symptoms by killing dopamine neurons in the brain; identified in 1982 in contaminated opioids, it became the most widely used toxin model of Parkinson's disease.
MPtrj
MPtrj (Materials Project Trajectory) is an open dataset of 1.58 million DFT relaxation trajectories from the Materials Project, collated in 2023 as CHGNet's training set.
MRI contrast agent
An MRI contrast agent is a substance, usually a gadolinium chelate injected intravenously, that alters the magnetic properties of nearby water molecules so tissues stand out on MRI scans.
MRI-ESM
MRI-ESM is a family of Earth system models developed at the Meteorological Research Institute of the Japan Meteorological Agency in Tsukuba, Japan; its flagship version, MRI-ESM2.0, contributes to CMIP6.
Mrk 116
Mrk 116, also written Markarian 116, is the Markarian catalog designation for I Zwicky 18, an extremely metal-poor blue compact dwarf galaxy in the constellation Ursa Major.
Mrk 1502
Mrk 1502, better known as I Zwicky 1 (I Zw 1), is a nearby narrow-line Seyfert 1 galaxy in an almost face-on spiral host at redshift 0.0589.
Mrk 335
Mrk 335, also known as Markarian 335, is a narrow-line Seyfert 1 galaxy about 324 million light-years away in Pegasus whose supermassive black hole drives unusually variable X-ray output.
Mrk 509
Mrk 509 (Markarian 509) is a bright Seyfert 1 galaxy in Aquarius, about 500 million light-years away, with a black hole of roughly 300 million solar masses.
MSF time signal
The MSF time signal is the United Kingdom's dedicated time broadcast on 60 kHz from Anthorn, Cumbria, keeping radio-controlled clocks set to UK civil time.
Mstislav Gnevyshev
Mstislav Nikolaevich Gnevyshev (Мстислав Николаевич Гневышев, 1914–1992) was a Soviet astronomer at Pulkovo Observatory known for the Gnevyshev–Ohl rule, the Gnevyshev gap, and the Gnevyshev–Waldmeier rule.
MSWEP
MSWEP (Multi-Source Weighted-Ensemble Precipitation) is a global gridded precipitation dataset merging gauge, satellite, and reanalysis data, with version 3 offering hourly, 0.1° estimates from 1979.
Mt Todd
Mt Todd is a development-stage gold project in Australia's Northern Territory, 55 km northwest of Katherine, holding 9.1 million ounces of gold and owned by Vista Gold.
MT3DMS
MT3DMS is a modular three-dimensional multi-species solute transport model that simulates contaminant advection, dispersion, and reactions in groundwater, coupled with the USGS flow model MODFLOW.
Mu (亩/畝) (land)
The mu, also known as the Chinese acre, is a traditional Chinese unit of land area, fixed since 1959 at 666 ²⁄₃ square meters, one fifteenth of a hectare.
Mu Cassiopeiae
Mu Cassiopeiae (μ Cas) is a nearby binary star in Cassiopeia whose metal-poor, high-velocity primary is an old Population II star about 12.7 billion years old.
Mu Centauri
Mu Centauri (μ Cen) is a bright Be star of spectral type B2 in the constellation Centaurus, about magnitude 3.47, ringed by a gaseous circumstellar disk.
Mu Cephei
Mu Cephei (μ Cep), known as Herschel's Garnet Star, is a deep-red semiregular variable red supergiant in Cepheus, among the largest and most luminous known.
Mu Columbae
Mu Columbae (μ Col, Mu Col) is a hot O9.5 main-sequence star in the constellation Columba, one of the fastest known runaway stars, moving at about 117 km/s.
Mu Geminorum
Mu Geminorum, formally named Tejat by the International Astronomical Union in 2017, is a red giant and irregular variable star of magnitude 3 in Gemini, about 230 light-years away.
Mu-Hyun Baik
Mu-Hyun Baik (백무현) is a South Korean computational chemist, professor at KAIST since 2015, known for computationally designed C–H activation catalysts and the electro-inductive effect reported in Science in 2020.
Mu¹ Herculis
Mu¹ Herculis, abbreviated μ Her, is a nearby quadruple star system in Hercules about 27 light years from the Sun, with a bright G-type subgiant primary that shows solar-like oscillations.
Mu2e
Mu2e is a Fermilab particle physics experiment searching for the neutrinoless conversion of a muon into an electron, with first physics data planned for 2027.
Mu3e
Mu3e is a particle physics experiment at the Paul Scherrer Institute in Villigen, Switzerland, searching for the forbidden muon decay into two positrons and one electron.
Muconic acid
Muconic acid is an unsaturated dicarboxylic acid with three stereoisomers, produced by fermentation from biomass and valued as a renewable route to adipic acid, the nylon precursor.
Mud logging
Mud logging is a wellsite monitoring method in petroleum geology that analyzes drilling mud and rock cuttings to detect hydrocarbons while a well is drilled, standard on rigs since the 1930s.
Mudstone
Mudstone is a fine-grained sedimentary rock of hardened mud, essentially shale without its fine lamination or ability to split into thin flakes, making up much of the sedimentary record.
Mudstone (carbonate)
Mudstone, in carbonate geology, is a mud-supported limestone or carbonate rock with less than 10 percent grains, the finest-grained class of Robert J. Dunham's 1962 depositional-texture classification, formed in low-energy settings.
Mueller matrix imaging
Mueller matrix imaging is an optical technique that measures, pixel by pixel, the 4×4 Mueller matrix describing how a sample transforms light's polarization, used in cancer diagnostics and materials analysis.