61,984 articles
Metal matrix composite
A metal matrix composite (MMC) is an engineered material combining a metal matrix, usually aluminum, titanium, or magnesium, with ceramic reinforcement for strength, stiffness, and wear resistance.
Metal oxide redox thermal energy storage
Metal oxide redox thermal energy storage is a thermochemical technology that stores heat in the reversible reduction of a metal oxide and releases it on reoxidation with air.
Metal particle tape
Metal particle tape (MP tape) is a magnetic recording tape whose coating is pure iron particles in a polymer binder, introduced for videotape in 1987 and used in Betacam SP, 8 mm, and D-2.
Metal-clad switchgear
Metal-clad switchgear (MC switchgear) is medium-voltage switchgear in which circuit breakers, buses, and cable terminations are housed in separate compartments enclosed by grounded metal barriers.
Metal-enclosed switchgear
Metal-enclosed switchgear is power switching equipment enclosed on all sides and top in sheet metal, containing switches, circuit breakers, fuses, and buses for medium-voltage distribution, standardized by IEEE C37.20.3.
Metal-halide lamp
A metal-halide lamp is a high-intensity discharge lamp that makes light from an electric arc through mercury vapor and metal-halide salts, first announced commercially by General Electric in 1962.
Metal-organic chemical vapor deposition
Metal-organic chemical vapor deposition, also called metalorganic vapor phase epitaxy (MOVPE), is an epitaxy process that grows semiconductor films and dominates manufacture of LEDs and laser diodes.
Metal-organic framework thermal energy storage
Metal-organic framework thermal energy storage stores and releases heat using MOFs, porous crystals that hold phase change materials in their pores or act as adsorbents in heat-storage cycles.
Metal-organic framework water harvesting
Metal-organic framework water harvesting is atmospheric water harvesting in which porous MOF crystals capture water vapor even in dry desert air, then release it when heated or exposed to sunlight.
Metal-oxide photoresist
A metal-oxide photoresist (MOR) is an inorganic, metal-containing photosensitive film used to pattern integrated circuits in extreme ultraviolet (EUV) lithography; tin-oxide formulations are leading candidates for advanced chips.
Metal–air battery
A metal–air battery is an electrochemical cell that oxidizes a metal anode while drawing its cathode oxygen from the air, giving it some of the highest theoretical energy densities of any battery family.
Metal–organic framework hydrogen storage
Metal–organic framework hydrogen storage stores hydrogen by physisorption inside metal–organic frameworks, porous crystalline materials with tunable pores and exceptionally high surface areas studied intensively as adsorbents since 2003.
Metal–organic frameworks for gas separation
Metal–organic frameworks for gas separation are porous crystalline adsorbents and membranes built from metal ions and organic linkers, whose tunable pores sort gas mixtures selectively.
Metal–semiconductor–metal photodetector
A metal–semiconductor–metal (MSM) photodetector uses two interdigitated Schottky metal electrodes on a semiconductor, giving very low capacitance, high speed, and easy integration with transistor circuits.
Metallic uranium fuel
Metallic uranium fuel is nuclear fuel made of uranium metal or alloys such as U-Zr and U-Mo rather than ceramic uranium dioxide, used mainly in fast and research reactors.
Metallization (semiconductor fabrication)
Metallization is the semiconductor-fabrication step that deposits metal layers onto a wafer, forming the contacts, vias, and interconnects that link transistors into a working circuit.
Metallurgy
Metallurgy is the art and science of extracting metals from their ores and modifying them for use, spanning extraction steps like smelting and refining, and physical processes like alloying and heat treatment.
Metalorganic vapor phase epitaxy
Metalorganic vapor phase epitaxy (MOVPE), also known as MOCVD, is a chemical vapor deposition technique that grows single-crystal semiconductor layers, the basis of LEDs, lasers, and solar cells.
Metalsa
Metalsa is a Mexican manufacturer of structural automotive components, specializing in chassis structures for light and commercial vehicles, headquartered in Monterrey and owned by Grupo Proeza.
Metalworking
Metalworking is the set of processes that shape metal into useful objects, spanning casting of molten metal, forming under pressure, cutting, joining, and heat treatment, with roots in ancient history.
MetaMask
MetaMask is a self-custodial cryptocurrency wallet developed by Consensys, launched as a browser extension in 2016 and used to hold tokens and connect to dapps on Ethereum and other blockchains.
Metamaterial
A metamaterial is an engineered composite whose properties come from subwavelength structure rather than chemical composition, allowing effects like negative refraction not found in natural materials.
Metamaterial lens
A metamaterial lens is a lens made from an engineered periodic composite with a designed refractive index, covering negative-index slab superlenses that image beyond the diffraction limit and flat metalenses built from metasurfaces.
Metamaterial waveguides for slow light (plasmonic)
Plasmonic metamaterial waveguides for slow light are artificial metal-dielectric structures that slow guided surface-plasmon polaritons up to roughly 100-fold, enhancing light-matter interactions while metal absorption limits practical performance.
Metamodeling (simulation)
Metamodeling builds a simplified mathematical surrogate that approximates the input–output behavior of an expensive computer simulation, so optimization, sensitivity analysis, and uncertainty quantification can run on the surrogate instead of the simulator.
Metamorphic code
Metamorphic code is program code that rewrites itself between copies while retaining its core functionality, used in some mission-critical software but best known for helping malware evade signature-based antivirus detection.
Metamorphic mechanism
A metamorphic mechanism is a mechanism whose structure, number of links, and degrees of freedom change during operation, proposed by Jian S. Dai and J. Rees Jones in 1998.
Metamorphic testing
Metamorphic testing is a software testing technique that checks whether outputs of multiple related executions satisfy metamorphic relations, letting testers check programs that lack a test oracle.
METANET
METANET is a macroscopic second-order traffic flow model and simulation program for motorway networks, developed by Markos Papageorgiou and Albert Messmer and first published in 1990.
Metaphone
Metaphone is a phonetic algorithm published by Lawrence Philips in 1990 that codes English words by pronunciation, so similarly sounding words and names match despite different spellings; it replaced Soundex.