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Mayer's reagent is an alkaloidal precipitating reagent used for the detection of alkaloids in natural products. Mayer's reagent is freshly prepared by dissolving a mixture of mercuric chloride (1.36 g) and of potassium iodide (5.00 g) in water (100.0 ml). [ 1 ] [ 2 ] Most alkaloids are precipitated from neutral or slig... | https://en.wikipedia.org/wiki/Mayer's_reagent |
Maynard Victor Olson is an American chemist and molecular biologist. As a professor of genome sciences and medicine at the University of Washington , he became a specialist in the genetics of cystic fibrosis , and one of the founders of the Human Genome Project . During his years at Washington University in St. Louis ,... | https://en.wikipedia.org/wiki/Maynard_Olson |
Maynard operation sequence technique (MOST) [ 1 ] is a predetermined motion time system that is used primarily in industrial settings to set the standard time in which a worker should perform a task. To calculate this, a task is broken down into individual motion elements, and each is assigned a numerical time value i... | https://en.wikipedia.org/wiki/Maynard_operation_sequence_technique |
The Mayor's Award for Excellence in Science and Technology is given annually to recognise important members of the science and engineering communities in New York City . Candidates must live or work in the city. [ 1 ]
Nominations are submitted in five categories: [ 2 ]
The Mayor chooses winners from a list of finalis... | https://en.wikipedia.org/wiki/Mayor's_Award_for_Excellence_in_Science_and_Technology |
The Mayo–Lewis equation or copolymer equation in polymer chemistry describes the distribution of monomers in a copolymer . It was proposed by Frank R. Mayo and Frederick M. Lewis . [ 1 ]
The equation considers a monomer mix of two components M 1 {\displaystyle M_{1}\,} and M 2 {\displaystyle M_{2}\,} and the four diff... | https://en.wikipedia.org/wiki/Mayo–Lewis_equation |
Maytal Caspary Toroker is an associate professor in the Department of Materials Science and Engineering at Technion-Israel Institute of Technology , Haifa , Israel . [ 1 ] She is recognized for her significant contributions in the field of computational materials science, particularly in its applications to catalysis, ... | https://en.wikipedia.org/wiki/Maytal_Caspary_Toroker |
In electronic design automation , maze runner is a connection routing method that represents the entire routing space as a grid. Parts of this grid are blocked by components, specialised areas, or already present wiring. The grid size corresponds to the wiring pitch of the area. The goal is to find a chain of grid cell... | https://en.wikipedia.org/wiki/Maze_runner |
Mazut ( Russian : Мазут , romanized : Mazut ) is a low-quality heavy fuel oil , used in power plants and similar applications in Iran and some countries of the former Soviet Union. In the West, through fluid catalytic cracking , mazut is distilled into diesel and other light distillates. [ 2 ] [ 3 ] Mazut may be used f... | https://en.wikipedia.org/wiki/Mazut |
The McCabe–Thiele method is a technique that is commonly employed in the field of chemical engineering to model the separation of two substances by a distillation column . [ 1 ] [ 2 ] [ 3 ] It uses the fact that the composition at each theoretical tray is completely determined by the mole fraction of one of the two com... | https://en.wikipedia.org/wiki/McCabe–Thiele_method |
In physical chemistry , the McConnell equation gives the probability of an unpaired electron in an in aromatic radical compound (such as benzene radical anion C 6 H 6 − {\displaystyle C_{6}H_{6}^{-}} ) being on a particular atom. It relates this probability, known as the "spin density", to its proportional dependence o... | https://en.wikipedia.org/wiki/McConnell_equation |
The McCormack reaction is a method for the synthesis of organophosphorus compounds . In this reaction, a 1,3- diene and a source of R 2 P + are combined to give phospholenium cation. The reaction is named after W. B. McCormack, a research chemist at duPont.
An illustrative reaction involves phenyldichlorophosphine and... | https://en.wikipedia.org/wiki/McCormack_reaction |
The McCumber relation (or McCumber theory) is a relationship between the effective cross-sections of absorption and emission of light in the physics of solid-state lasers . [ 1 ] [ 2 ] It is named after Dean McCumber , who proposed the relationship in 1964.
Let σ a ( ω ) {\displaystyle \sigma _{\rm {a}}(\omega )} be t... | https://en.wikipedia.org/wiki/McCumber_relation |
The McCutcheon index or chemotactic ratio is a numerical metric that quantifies the efficiency of movement. It is calculated as the ratio of the net displacement of a moving entity to the total length of the path it has traveled. [ 1 ] [ 2 ]
The index acts as an evaluative measure of the directness of movement. A valu... | https://en.wikipedia.org/wiki/McCutcheon_index |
The McDonald–Kreitman test [ 1 ] is a statistical test often used by evolutionary and population biologists to detect and measure the amount of adaptive evolution within a species by determining whether adaptive evolution has occurred, and the proportion of substitutions that resulted from positive selection (also know... | https://en.wikipedia.org/wiki/McDonald–Kreitman_test |
The McFadyen–Stevens reaction is a chemical reaction best described as a base-catalyzed thermal decomposition of acylsulfonylhydrazides to aldehydes . [1] [2]
Dudman et al. have developed an alternative hydrazide reagent. [3]
The mechanism of the McFadyen–Stevens reaction is still under investigation. Two groups hav... | https://en.wikipedia.org/wiki/McFadyen–Stevens_reaction |
In microbiology , McFarland standards are used as a reference to adjust the turbidity of bacterial suspensions so that the number of bacteria will be within a given range to standardize microbial testing. An example of such testing is antibiotic susceptibility testing by measurement of minimum inhibitory concentration... | https://en.wikipedia.org/wiki/McFarland_standards |
The McGehee transformation was introduced by Richard McGehee to study the triple collision singularity in the n-body problem .
The transformation blows up the single point in phase space where the collision occurs into a collision manifold , the phase space point is cut out and in its place a smooth manifold is pasted... | https://en.wikipedia.org/wiki/McGehee_transformation |
McIlvaine buffer is a buffer solution composed of citric acid and disodium hydrogen phosphate , also known as citrate-phosphate buffer . It was introduced in 1921 by the United States agronomist Theodore Clinton McIlvaine (1875–1959) from West Virginia University , and it can be prepared in pH 2.2 to 8 by mixing two st... | https://en.wikipedia.org/wiki/McIlvaine_buffer |
McIntosh and Fildes' anaerobic jar is an instrument used in the production of an anaerobic environment. This method of anaerobiosis as others is used to culture bacteria which die or fail to grow in presence of oxygen ( anaerobes ). [ 1 ] [ 2 ] It was originally introduced by James McIntosh, Paul Fildes and William Bul... | https://en.wikipedia.org/wiki/McIntosh_and_Fildes'_anaerobic_jar |
In mathematics , specifically in the field of group theory , the McKay conjecture is a theorem of equality between two numbers: the number of irreducible complex characters of degree not divisible by a prime number p {\displaystyle p} for a given finite group and the same number for the normalizer in that group of a Sy... | https://en.wikipedia.org/wiki/McKay_conjecture |
Condorcet methods
Positional voting
Cardinal voting
Quota-remainder methods
Approval-based committees
Fractional social choice
Semi-proportional representation
By ballot type
Pathological response
Strategic voting
Paradoxes of majority rule
Positive results
The McKelvey–Schofield chaos theorem is a result i... | https://en.wikipedia.org/wiki/McKelvey–Schofield_chaos_theorem |
McKinsey & Company (informally McKinsey or McK ) is an American multinational strategy and management consulting firm that offers professional services to corporations, governments, and other organizations. Founded in 1926 by James O. McKinsey , McKinsey is the oldest and largest of the " MBB " management consultancies... | https://en.wikipedia.org/wiki/McKinsey_&_Company |
The McLafferty rearrangement is a reaction observed in mass spectrometry during the fragmentation or dissociation of organic molecules. It is sometimes found that a molecule containing a keto-group undergoes β-cleavage, with the gain of the γ-hydrogen atom, as first reported by Anthony Nicholson working in the Division... | https://en.wikipedia.org/wiki/McLafferty_rearrangement |
The McMurry reaction is an organic reaction in which two ketone or aldehyde groups are coupled to form an alkene using a titanium chloride compound such as titanium(III) chloride and a reducing agent . The reaction is named after its co-discoverer, John E. McMurry . The McMurry reaction originally involved the use of a... | https://en.wikipedia.org/wiki/McMurry_reaction |
In automata theory , McNaughton's theorem refers to a theorem that asserts that the set of ω-regular languages is identical to the set of languages recognizable by deterministic Muller automata . [ 1 ] This theorem is proven by supplying an algorithm to construct a deterministic Muller automaton for any ω-regular langu... | https://en.wikipedia.org/wiki/McNaughton's_theorem |
In the general theory of relativity , the McVittie metric is the exact solution of Einstein's field equations that describes a black hole or massive object immersed in an expanding cosmological spacetime . The solution was first fully obtained by George McVittie in the 1930s, while investigating the effect of the, the... | https://en.wikipedia.org/wiki/McVittie_metric |
Acetone ( 2-propanone or dimethyl ketone ) is an organic compound with the formula (CH 3 ) 2 CO . [ 22 ] It is the simplest and smallest ketone ( R−C(=O)−R' ). It is a colorless, highly volatile , and flammable liquid with a characteristic pungent odor. [ 23 ]
Acetone is miscible with water and serves as an important... | https://en.wikipedia.org/wiki/Me2CO |
Dimethyl sulfate ( DMS ) is a chemical compound with formula (CH 3 O) 2 SO 2 . As the diester of methanol and sulfuric acid , its formula is often written as ( CH 3 ) 2 SO 4 or Me 2 SO 4 , where CH 3 or Me is methyl . Me 2 SO 4 is mainly used as a methylating agent in organic synthesis . Me 2 SO 4 is a colourless oily... | https://en.wikipedia.org/wiki/Me2SO4 |
Trimethylborane (TMB) is a toxic, pyrophoric gas with the formula B(CH 3 ) 3 (which can also be written as Me 3 B, with Me representing methyl ).
As a liquid it is colourless. The strongest line in the infrared spectrum is at 1330 cm −1 followed by lines at 3010 cm −1 and 1185 cm −1 .
Its melting point is −161.5 °C, ... | https://en.wikipedia.org/wiki/Me3B |
MeRIPseq [ 1 ] (or MeRIP-seq ) stands for methylated RNA immunoprecipitation sequencing, which is a method for detection of post-transcriptional RNA modifications, developed by Kate Meyer et al. while working in the laboratory of Sammie Jaffrey at Cornell University Graduate School of Medical Sciences. It is also calle... | https://en.wikipedia.org/wiki/MeRIPseq |
Meagher Electronics was a Monterey, California , company which was founded in 1947 by Jim Meagher. It included a recording studio which recorded early demos for Joan Baez , her sister, Mimi Farina and her sister's husband, Richard Farina . The company also repaired all sorts of home entertainment equipment, focusing o... | https://en.wikipedia.org/wiki/Meagher_Electronics |
Meal powder [ 1 ] is the fine dust left over when black powder ( gunpowder ) is corned and screened to separate it into different grain sizes. It is used extensively in various pyrotechnic procedures, usually to prime other compositions. It can also be used in many fireworks to add power and substantially increasing ... | https://en.wikipedia.org/wiki/Meal_powder |
Mean-field game theory is the study of strategic decision making by small interacting agents in very large populations. It lies at the intersection of game theory with stochastic analysis and control theory . The use of the term "mean field" is inspired by mean-field theory in physics, which considers the behavior of s... | https://en.wikipedia.org/wiki/Mean-field_game_theory |
In physics and probability theory , Mean-field theory ( MFT ) or Self-consistent field theory studies the behavior of high-dimensional random ( stochastic ) models by studying a simpler model that approximates the original by averaging over degrees of freedom (the number of values in the final calculation of a statisti... | https://en.wikipedia.org/wiki/Mean-field_theory |
In mathematical analysis , the concept of a mean-periodic function is a generalization introduced in 1935 by Jean Delsarte [ 1 ] [ 2 ] of the concept of a periodic function . Further results were made by Laurent Schwartz and J-P Kahane. [ 3 ] [ 4 ]
Consider a continuous complex -valued function f of a real variable. ... | https://en.wikipedia.org/wiki/Mean-periodic_function |
In probability and statistics , a mean-preserving spread ( MPS ) [ 1 ] is a change from one probability distribution A to another probability distribution B, where B is formed by spreading out one or more portions of A's probability density function or probability mass function while leaving the mean (the expected valu... | https://en.wikipedia.org/wiki/Mean-preserving_spread |
In mathematics , the mean (topological) dimension of a topological dynamical system is a non-negative extended real number that is a measure of the complexity of the system. Mean dimension was first introduced in 1999 by Gromov . [ 1 ] Shortly after it was developed and studied systematically by Lindenstrauss and Weiss... | https://en.wikipedia.org/wiki/Mean_dimension |
In organizational management , mean down time ( MDT ) is the average time that a system is non-operational. This includes all downtime associated with repair , corrective and preventive maintenance , self-imposed downtime , and any logistics or administrative delays.
The inclusion of delay times distinguishes mean dow... | https://en.wikipedia.org/wiki/Mean_down_time |
In fluid dynamics , the fluid flow is often decomposed into a mean flow and deviations from the mean . The averaging can be done either in space or in time, or by ensemble averaging .
Calculation of the mean flow may often be as simple as the mathematical mean : simply add up the given flow rates and then divide the f... | https://en.wikipedia.org/wiki/Mean_flow |
In physics , mean free path is the average distance over which a moving particle (such as an atom , a molecule , or a photon ) travels before substantially changing its direction or energy (or, in a specific context, other properties), typically as a result of one or more successive collisions with other particles.
Im... | https://en.wikipedia.org/wiki/Mean_free_path |
Molecules in a fluid constantly collide with each other. The mean free time for a molecule in a fluid is the average time between collisions. The mean free path of the molecule is the product of the average speed and the mean free time. [ 1 ] These concepts are used in the kinetic theory of gases to compute transport c... | https://en.wikipedia.org/wiki/Mean_free_time |
Mean inter-particle distance (or mean inter-particle separation) is the mean distance between microscopic particles (usually atoms or molecules ) in a macroscopic body.
From the very general considerations, the mean inter-particle distance is proportional to the size of the per-particle volume 1 / n {\displaystyle 1/n... | https://en.wikipedia.org/wiki/Mean_inter-particle_distance |
In calculus , and especially multivariable calculus , the mean of a function is loosely defined as the ” average " value of the function over its domain .
In a one-dimensional domain , the mean of a function f ( x ) over the interval ( a , b ) is defined by: [ 1 ]
Recall that a defining property of the average value ... | https://en.wikipedia.org/wiki/Mean_of_a_function |
Mean opinion score ( MOS ) is a measure used in the domain of Quality of Experience and telecommunications engineering , representing overall quality of a stimulus or system. It is the arithmetic mean over all individual "values on a predefined scale that a subject assigns to his opinion of the performance of a system ... | https://en.wikipedia.org/wiki/Mean_opinion_score |
In game theory , a mean payoff game is a zero-sum game played on the vertices of a weighted directed graph . The game is played as follows: at the start of the game, a token is placed on one of the vertices of the graph. Each vertex is assigned to either the Maximizer of the Minimizer. The player that controls the curr... | https://en.wikipedia.org/wiki/Mean_payoff_game |
The mean radius in astronomy is a measure for the size of planets and small Solar System bodies . Alternatively, the closely related mean diameter ( D {\displaystyle D} ), which is twice the mean radius, is also used. For a non-spherical object, the mean radius (denoted R {\displaystyle R} or r {\displaystyle r} ) is d... | https://en.wikipedia.org/wiki/Mean_radius_(astronomy) |
The mean sojourn time (or sometimes mean waiting time ) for an object in a dynamical system is the amount of time an object is expected to spend in a system before leaving the system permanently. This concept is widely used in various fields, including physics, chemistry, and stochastic processes, to study the behavio... | https://en.wikipedia.org/wiki/Mean_sojourn_time |
The mean speed theorem , also known as the Merton rule of uniform acceleration , [ 1 ] was discovered in the 14th century by the Oxford Calculators of Merton College , and was proved by Nicole Oresme . It states that a uniformly accelerated body (starting from rest, i.e. zero initial velocity) travels the same distance... | https://en.wikipedia.org/wiki/Mean_speed_theorem |
In medicine , the mean systemic pressure (MSP) or mean systemic filling pressure (MSFP) is defined as the mean pressure that exists in the circulatory system when there is no blood motion. A similar term, mean circulatory filling pressure , (MCFP) is defined as the mean pressure that exists in the combined circulatory ... | https://en.wikipedia.org/wiki/Mean_systemic_pressure |
In a system the mean time between outages ( MTBO ) is the mean time between equipment failures that result in loss of system continuity or unacceptable degradation .
The MTBO is calculated by the equation,
M T B O = M T B F 1 − F F A S {\displaystyle MTBO={\frac {MTBF}{1-FFAS}}}
where MTBF is the nonredundant mean t... | https://en.wikipedia.org/wiki/Mean_time_between_outages |
Mean time (to) first failure (MTFF , sometimes MTTFF) is a concept in reliability engineering , which describes time to failure for non-repairable components like an integrated circuit soldered on a circuit board. [ 1 ] For repairable components like a replaceable light bulb the concept of mean time between failures is... | https://en.wikipedia.org/wiki/Mean_time_to_first_failure |
Mean time to recovery ( MTTR ) [ 1 ] [ 2 ] [ 3 ] is the average time that a device will take to recover from any failure. Examples of such devices range from self-resetting fuses (where the MTTR would be very short, probably seconds), to whole systems which have to be repaired or replaced.
The MTTR would usually be pa... | https://en.wikipedia.org/wiki/Mean_time_to_recovery |
In mathematics , the mean value theorem (or Lagrange's mean value theorem ) states, roughly, that for a given planar arc between two endpoints, there is at least one point at which the tangent to the arc is parallel to the secant through its endpoints. It is one of the most important results in real analysis . This the... | https://en.wikipedia.org/wiki/Mean_value_theorem |
In mathematics , a meander or closed meander is a self-avoiding closed curve which crosses a given line a number of times, meaning that it intersects the line while passing from one side to the other. Intuitively, a meander can be viewed as a meandering river with a straight road crossing the river over a number of br... | https://en.wikipedia.org/wiki/Meander_(mathematics) |
Non-linguistic (or pre-linguistic ) meaning is a type of meaning not mediated or perceived through linguistic signs .
In linguistics , the concept is used in discussions. It is whether about such meaning is different from meaning expressed through language (i.e. semantics ), It is also Interesting, should play a role ... | https://en.wikipedia.org/wiki/Meaning_(non-linguistic) |
This is a list of minor planets which have been officially named by the Working Group for Small Bodies Nomenclature (WGSBN) of the International Astronomical Union (IAU). The list consists of partial pages, each covering a number range of 1,000 bodies citing the source after each minor planet was named for. An overview... | https://en.wikipedia.org/wiki/Meanings_of_minor-planet_names |
In mathematics , a measure-preserving dynamical system is an object of study in the abstract formulation of dynamical systems , and ergodic theory in particular. Measure-preserving systems obey the Poincaré recurrence theorem , and are a special case of conservative systems . They provide the formal, mathematical basis... | https://en.wikipedia.org/wiki/Measure-preserving_dynamical_system |
The measure problem in cosmology concerns how to compute the ratios of universes of different types within a multiverse . It typically arises in the context of eternal inflation . The problem arises because different approaches to calculating these ratios yield different results, and it is not clear which approach (if ... | https://en.wikipedia.org/wiki/Measure_problem_(cosmology) |
A measure space is a basic object of measure theory , a branch of mathematics that studies generalized notions of volumes . It contains an underlying set, the subsets of this set that are feasible for measuring (the σ -algebra ) and the method that is used for measuring (the measure ). One important example of a measu... | https://en.wikipedia.org/wiki/Measure_space |
In the oil industry measured depth (commonly referred to as MD, or just the depth ) is the length of the drilled borehole . [ 1 ] In conventional vertical wells, this coincides with the true vertical depth , but in directional or horizontal wells, especially those using extended reach drilling , the two can deviate gre... | https://en.wikipedia.org/wiki/Measured_depth |
An Measured Environmental Concentration (MEC) relates to a chemical substance found in an environmental sample. The concentration of the compound may result from direct contamination, transformation and/or metabolization of a different chemical contaminant, natural origin or a combination of these sources.
MEC is to b... | https://en.wikipedia.org/wiki/Measured_environmental_concentration |
A variety of objective means exist to empirically measure biodiversity . Each measure relates to a particular use of the data, and is likely to be associated with the variety of genes. Biodiversity is commonly measured in terms of taxonomic richness of a geographic area over a time interval. In order to calculate biodi... | https://en.wikipedia.org/wiki/Measurement_of_biodiversity |
Throughput of a network can be measured using various tools available on different platforms. This page explains the theory behind what these tools set out to measure and the issues regarding these measurements.
Reasons for measuring throughput in networks.
People are often concerned about measuring the maximum data ... | https://en.wikipedia.org/wiki/Measuring_network_throughput |
Mebendazole ( MBZ ), sold under the brand name Vermox among others, is a medication used to treat a number of parasitic worm infestations. [ 5 ] This includes ascariasis , pinworm infection , hookworm infections , guinea worm infections and hydatid disease , among others. [ 5 ] It has been used for treatment of giardia... | https://en.wikipedia.org/wiki/Mebendazole |
mecA is a gene found in bacterial cells which allows them to be resistant to antibiotics such as methicillin , penicillin and other penicillin-like antibiotics. [ 1 ]
The bacteria strain most commonly known to carry mecA is methicillin-resistant Staphylococcus aureus ( MRSA ). In Staphylococcus species, mecA is sprea... | https://en.wikipedia.org/wiki/MecA |
Mechanical, Electrical, and Plumbing ( MEP ) refers to the installation of services which provide a functional and comfortable space for the building occupants. In residential and commercial buildings, these elements are often designed by specialized MEP engineers. MEP's design is important for planning, decision-makin... | https://en.wikipedia.org/wiki/Mechanical,_electrical,_and_plumbing |
The Mechanical Workshops Wilhelm Albrecht (MWA) ( German : Mechanische Werkstätten Wilhelm Albrecht ) were founded in 1926 by the innovator, engineer, and entrepreneur, Wilhelm Albrecht [ 1 ] in Berlin-Tempelhof . The logo he designed became an internationally known trademark for complete device systems for image-synch... | https://en.wikipedia.org/wiki/Mechanical_Workshops_Wilhelm_Albrecht |
Mechanical advantage is a measure of the force amplification achieved by using a tool, mechanical device or machine system. The device trades off input forces against movement to obtain a desired amplification in the output force. The model for this is the law of the lever . Machine components designed to manage force... | https://en.wikipedia.org/wiki/Mechanical_advantage |
A simple machine that exhibits mechanical advantage is called a mechanical advantage device - e.g.:
Consider lifting a weight with rope and pulleys. A rope looped through a pulley attached to a fixed spot, e.g. a barn roof rafter, and attached to the weight is called a single pulley . It has a mechanical advantage (M... | https://en.wikipedia.org/wiki/Mechanical_advantage_device |
Mechanical alloying ( MA ) is a solid-state and powder processing technique involving repeated cold welding , fracturing, and re-welding of blended powder particles in a high-energy ball mill to produce a homogeneous material. Originally developed to produce oxide-dispersion strengthened (ODS) nickel- and iron-base sup... | https://en.wikipedia.org/wiki/Mechanical_alloying |
A mechanical biological treatment ( MBT ) system is a type of waste processing facility that combines a sorting facility with a form of biological treatment such as composting or anaerobic digestion . MBT plants are designed to process mixed household waste as well as commercial and industrial wastes .
The terms mecha... | https://en.wikipedia.org/wiki/Mechanical_biological_treatment |
Mechanical brake stretch wrappers are manual stretch wrapping systems which consist of a simple structure supporting a roll of film to be stretched and a mechanical brake which acts on the film roll, creating resistance to turning and stretching the film as it is fed out.
The amount of braking is often variable by mea... | https://en.wikipedia.org/wiki/Mechanical_brake_stretch_wrapper |
A mechanical calculator , or calculating machine , is a mechanical device used to perform the basic operations of arithmetic automatically, or a simulation like an analog computer or a slide rule . Most mechanical calculators were comparable in size to small desktop computers and have been rendered obsolete by the adve... | https://en.wikipedia.org/wiki/Mechanical_calculator |
Mechanical counters are counters built using mechanical components. They typically consist of a series of disks mounted on an axle, with the digits zero through nine marked on their edge. The right most disk moves one increment with each event. Each disk except the left-most has a protrusion that, after the completion ... | https://en.wikipedia.org/wiki/Mechanical_counter |
Mechanical engineering is the study of physical machines and mechanisms that may involve force and movement. It is an engineering branch that combines engineering physics and mathematics principles with materials science , to design , analyze, manufacture, and maintain mechanical systems . [ 1 ] It is one of the oldest... | https://en.wikipedia.org/wiki/Mechanical_engineering |
Mechanical engineering technology is the application of engineering principles and technological developments for the creation of useful products and production machinery. [ 1 ]
Mechanical engineering technologists are expected to apply current technologies and principles from machine and product design, production an... | https://en.wikipedia.org/wiki/Mechanical_engineering_technology |
Mechanical impedance is a measure of how much a structure resists motion when subjected to a harmonic force. It relates forces with velocities acting on a mechanical system. The mechanical impedance of a point on a structure is the ratio of the force applied at a point to the resulting velocity at that point. [ 1 ] [ 2... | https://en.wikipedia.org/wiki/Mechanical_impedance |
A mechanical joint is a section of a machine which is used to connect one or more mechanical parts to another. Mechanical joints may be temporary or permanent; most types are designed to be disassembled. Most mechanical joints are designed to allow relative movement of these mechanical parts of the machine in one degre... | https://en.wikipedia.org/wiki/Mechanical_joint |
Mechanical load is the physical stress on a mechanical system or component [ 1 ] leading to strain . Loads can be static or dynamic . Some loads are specified as part of the design criteria of a mechanical system. Depending on the usage, some mechanical loads can be measured by an appropriate test method in a laborat... | https://en.wikipedia.org/wiki/Mechanical_load |
Mechanical metamaterials are rationally designed artificial materials/structures of precision geometrical arrangements leading to unusual physical and mechanical properties. These unprecedented properties are often derived from their unique internal structures rather than the materials from which they are made. Inspira... | https://en.wikipedia.org/wiki/Mechanical_metamaterial |
A mechanical network is an abstract interconnection of mechanical elements along the lines of an electrical circuit diagram . Elements include rigid bodies , springs , dampers , transmissions , and actuators .
The symbols from left to right are: stiffness element (e.g. spring), mass (rigid body), mechanical resistanc... | https://en.wikipedia.org/wiki/Mechanical_network |
The failure or fracture of a product or component as a result of a single event is known as mechanical overload . It is a common failure mode . The terms are used in forensic engineering and structural engineering when analysing product failure. Failure may occur because either the product is weaker than expected owing... | https://en.wikipedia.org/wiki/Mechanical_overload |
The mechanical paradox is an apparatus for studying physical paradoxes . It consists of a trapezoidal veneered wooden frame with two brass rails, and a pair of brass cones joined at their bases by a wooden disk which rests on the rails. When the double cone is placed at the low end of the frame, it automatically starts... | https://en.wikipedia.org/wiki/Mechanical_paradox |
Mechanical plating , also known as peen plating , mechanical deposition , or impact plating , is a plating process that imparts the coating by cold welding fine metal particles to a workpiece. Mechanical galvanization is the same process, but applies to coatings that are thicker than 0.001 in (0.025 mm). [ 1 ] It is co... | https://en.wikipedia.org/wiki/Mechanical_plating |
A mechanical powder press is a machine press designed to compress powders, commonly used in the production of technical ceramics .
The function principles of the mechanic press machines differ in how to ensure the upper punch–main movement by cams, spindles-and friction drives, eccentric , knuckle-joints or by the rou... | https://en.wikipedia.org/wiki/Mechanical_powder_press |
Mechanical screening , often just called screening , is the practice of taking granulated or crushed ore material and separating it into multiple grades by particle size .
This practice occurs in a variety of industries such as mining and mineral processing , agriculture, pharmaceutical, food, plastics, and recycling.... | https://en.wikipedia.org/wiki/Mechanical_screening |
In classical mechanics , a branch overlapping in physics and applied mathematics , mechanical similarity occurs when the potential energy is a homogeneous function of the positions of the particles, with the result that the trajectories of the particles in the system are geometrically similar paths, differing in size b... | https://en.wikipedia.org/wiki/Mechanical_similarity |
In engineering , a mechanical singularity is a position or configuration of a mechanism or a machine where the subsequent behaviour cannot be predicted, or the forces or other physical quantities involved become infinite or nondeterministic .
When the underlying engineering equations of a mechanism or machine are eval... | https://en.wikipedia.org/wiki/Mechanical_singularity |
Mechanical testing covers a wide range of tests, which can be divided broadly into two types:
There exists a large number of tests, many of which are standardized, to determine the various mechanical properties of materials. In general, such tests set out to obtain geometry-independent properties; i.e. those intrinsic... | https://en.wikipedia.org/wiki/Mechanical_testing |
In physics , a mechanical wave is a wave that is an oscillation of matter , and therefore transfers energy through a material medium . [ 1 ] (Vacuum is, from classical perspective, a non-material medium, where electromagnetic waves propagate.)
While waves can move over long distances, the movement of the medium of tra... | https://en.wikipedia.org/wiki/Mechanical_wave |
Mechanically aided scrubbers are a form of pollution control technology. This type of technology is a part of the group of air pollution controls collectively referred to as wet scrubbers .
In addition to using liquid sprays or the exhaust stream, scrubbing systems can use motors to supply energy. The motor drives a ... | https://en.wikipedia.org/wiki/Mechanically_aided_scrubber |
Polymer gradient materials (PGM) are a class of polymers with gradually changing mechanical properties along a defined direction creating an anisotropic material. These materials can be defined based upon the direction and the steepness of the gradient used and can display gradient or graded transitions. [ 1 ] A wide r... | https://en.wikipedia.org/wiki/Mechanically_gradient_polymers |
In chemistry , mechanically interlocked molecular architectures ( MIMAs ) are molecules that are connected as a consequence of their topology . This connection of molecules is analogous to keys on a keychain loop. The keys are not directly connected to the keychain loop but they cannot be separated without breaking the... | https://en.wikipedia.org/wiki/Mechanically_interlocked_molecular_architectures |
In thermodynamics , a mechanically isolated system is a system that is mechanically constrained to disallow deformations, so that it cannot perform any work on its environment. It may however, exchange heat across the system boundary.
For a simple system, mechanical isolation is equivalent to a state of constant volum... | https://en.wikipedia.org/wiki/Mechanically_isolated_system |
Mechanically stimulated gas emission (MSGE) is a complex phenomenon embracing various physical and chemical processes occurring on the surface and in the bulk of a solid under applied mechanical stress and resulting in emission of gases . MSGE is a part of a more general phenomenon of mechanically stimulated neutral em... | https://en.wikipedia.org/wiki/Mechanically_stimulated_gas_emission |
A mechanician is an engineer or a scientist working in the field of mechanics , or in a related or sub-field: engineering or computational mechanics , applied mechanics , geomechanics , biomechanics , and mechanics of materials . Names other than mechanician have been used occasionally, such as mechaniker and mechanic... | https://en.wikipedia.org/wiki/Mechanician |
Mechanics (from Ancient Greek μηχανική ( mēkhanikḗ ) ' of machines ' ) [ 1 ] [ 2 ] is the area of physics concerned with the relationships between force , matter , and motion among physical objects . [ 3 ] Forces applied to objects may result in displacements , which are changes of an object's position relative to its ... | https://en.wikipedia.org/wiki/Mechanics |
Mechanics of Advanced Composite Structures is a biannual peer-reviewed open-access scientific journal published by Semnan University . The editor-in-chief is Abdoulhossein Fereidoon (Semnan University). The journal covers all aspects of research on composite structures . It was established in 2014 and is abstracted and... | https://en.wikipedia.org/wiki/Mechanics_of_Advanced_Composite_Structures |
Mechanics of gelation describes processes relevant to sol-gel process .
In a static sense, the fundamental difference between a liquid and a solid is that the solid has elastic resistance against a shearing stress while a liquid does not. Thus, a simple liquid will not typically support a transverse acoustic phonon , ... | https://en.wikipedia.org/wiki/Mechanics_of_gelation |
In biology , a mechanism is a system of causally interacting parts and processes that produce one or more effects. [ 1 ] Phenomena can be explained by describing their mechanisms. For example, natural selection is a mechanism of evolution ; other mechanisms of evolution include genetic drift , mutation , and gene flow ... | https://en.wikipedia.org/wiki/Mechanism_(biology) |
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