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MDF (file format)
MDF, or Measurement Data Format, is a binary file format standardized by ASAM e.V. that stores recorded measurement data, serving as the de facto standard in the automotive industry.
MDL (programming language)
MDL, originally named Muddle, is a strongly typed Lisp dialect created at MIT in 1970, best known as the language of the original mainframe Zork.
MDX (MultiDimensional eXpressions)
MDX (MultiDimensional eXpressions), the OLAP query language from Microsoft defined in OLE DB for OLAP, queries cubes via SELECT/FROM/WHERE; used by Analysis Services, SAP, and Essbase, distinct from DAX.
Meagan S. Mauter
Meagan S. Mauter is an American environmental engineer at Stanford who works on water treatment and desalination, directing WE3Lab and the National Alliance for Water Innovation.
Mean average precision
Mean average precision, or mAP, is the standard evaluation metric for object detection models: the mean of per-class average precision computed from precision-recall curves of ranked detections.
Mean effective pressure
Mean effective pressure (MEP) is a theoretical engine parameter defined as the work produced in one engine cycle divided by displacement volume, allowing comparison of differently sized engines.
Mean filter
The mean filter is a linear spatial filter that replaces each pixel with the average of its neighborhood, reducing noise and smoothing images while blurring edges.
Mean reciprocal rank
Mean reciprocal rank (MRR) is an evaluation metric for ranked retrieval that averages, over a query set, the reciprocal of the rank of the first relevant result.
Mean shift
Mean shift is a nonparametric clustering algorithm that iteratively moves data points toward the mean of their neighborhood, settling at density modes that serve as cluster centers.
Mean time to recovery
Mean time to recovery (MTTR) is a reliability metric, also read as mean time to repair or resolve, measuring the average time to restore a system after failure.
Meandu Coal Mine
Meandu Coal Mine is an open-cut thermal coal mine near Kingaroy in Queensland, Australia, supplying the adjacent Tarong and Tarong North power stations since 1984.
Means of egress
A means of egress is the continuous, unobstructed path from any occupied part of a building to a public way, comprising the exit access, exit, and exit discharge.
Measured Boot
Measured Boot is a boot-security mechanism that records hashes of each firmware and software piece executed during startup into a TPM, enabling remote attestation of what booted.
Measurement and verification
Measurement and verification (M&V) quantifies the energy, water, and cost savings from efficiency improvements by comparing post-installation use against a baseline adjusted for weather and occupancy.
Measurement while drilling
Measurement while drilling (MWD) is a drilling technique that transmits downhole measurements, principally wellbore inclination and azimuth, to the surface in real time, typically by mud-pulse telemetry.
Measures on Cybersecurity Review
The Measures on Cybersecurity Review (网络安全审查办法), also translated Cybersecurity Review Measures, are Chinese regulatory rules under which the state reviews network products, services, and data-processing activities for national security risks.
Measuring AI Ability to Complete Long Tasks
Measuring AI Ability to Complete Long Tasks is a March 2025 METR benchmark measuring how long a task AI agents can complete, with horizons doubling every seven months since 2019.
Meat grinder
A meat grinder, also called a meat mincer, is a kitchen machine that forces meat through a perforated plate with a rotating screw and cutting knife, credited to Karl Drais in the 1820s.
MeBo
MeBo, short for Meeresboden-Bohrgerät (German for "sea floor drill rig"), is a family of robotic seafloor drilling rigs developed at MARUM, University of Bremen, that drills up to 80 m into the seabed.
Mecanum wheel
A Mecanum wheel, also called an Ilon wheel or Swedish wheel, is an omnidirectional wheel whose angled rollers let a four-wheel platform move sideways and rotate in place.
Meccano
Meccano is a metal model construction system of reusable strips, plates, and gears connected with nuts and bolts, invented by Frank Hornby in Liverpool and patented in 1901.
Mechanical advantage
Mechanical advantage is the ratio of the load a machine overcomes to the effort applied at its input, so an MA of 5 lifts a 500 N load with 100 N.
Mechanical alloying
Mechanical alloying, developed by John S. Benjamin at INCO in 1970, is a solid state powder metallurgy method that blends elemental powders in a high-energy ball mill.
Mechanical biological treatment
Mechanical biological treatment (MBT) is a waste management method combining mechanical sorting of mixed waste with biological treatment, diverting waste from landfill by recovering recyclables, producing fuel, and stabilizing organics.
Mechanical computing in metamaterials
Mechanical computing in metamaterials is an approach to information processing in which architected materials perform computations, with forces and deformations as inputs and bistable cells implementing logic gates and memory.
Mechanical counterpressure suit
A mechanical counterpressure suit, also known as a Space Activity Suit, is a proposed skintight elastic spacesuit protecting against vacuum without gas pressurization; none has flown.
Mechanical engineering
Mechanical engineering is the branch of engineering that applies physics and mathematics to design machines and mechanical systems, from turbines and generators to refrigeration and air-conditioning systems.
Mechanical face seal
A mechanical face seal is a device that seals fluid where a rotating shaft enters a stationary enclosure, most commonly on pumps, mixers, agitators, and compressors.
Mechanical fuse
A mechanical fuse is a deliberately weak drivetrain component, typically a shear pin or slip clutch, that breaks or slips under overload, protecting more expensive components downstream.
Mechanical metamaterial
A mechanical metamaterial is an artificial material whose mechanical properties come from a designed internal architecture, typically periodic unit cells, rather than chemical composition, enabling properties like negative stiffness.