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    • Mechanical engineering stubs

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    • Acid gas

    • Acid gas is a particular typology of natural gas or any other gas mixture containing significant quantities of hydrogen sulfide (H2S), carbon dioxide (CO2), or similar acidic gases. The terms acid gas and sour gas are often incorrectly treated as synonyms. Strictly speaking, a sour gas is any gas that specifically con ... Read »


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    • Active flow control

    • Airplane wing performance has a substantial effect on not only the runway length, approach speed, climb rate, cargo capacity, and operation range but also the community noise and emission levels. The wing performance is often degraded by flow separation, which strongly depends on the aerodynamic design of the airfoil p ... Read »


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    • Advanced Design System

    • Advanced Design System (ADS) is an electronic design automation software system produced by Keysight EEsof EDA, a division of Keysight Technologies. It provides an integrated design environment to designers of RF electronic products such as mobile phones, pagers, wireless networks, satellite communications, radar syste ... Read »


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    • Air pump

    • An air pump is a device for pushing air. Examples include a bicycle pump, pumps that are used to aerate an aquarium or a pond via an airstone; a gas compressor used to power a pneumatic tool, air horn or pipe organ; a bellows used to encourage a fire; a vacuum cleaner and a vacuum pump. Pumps and compressors use very ... Read »


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    • Aluminium powder

    • Aluminum powder is powdered aluminum. This was originally produced by mechanical means using a stamp mill to create flakes. Subsequently, a process of spraying molten aluminum to create a powder of droplets was developed by E. J. Hall in the 1920s. The resulting powder might then be processed further in a ball mill to ... Read »


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    • Aluminized screen

    • Aluminized screen may refer to a type of cathode ray tube (CRT) for video display, or to a type of projection screen for showing motion pictures or slides, especially in polarized 3D. Some cathode ray tubes, e.g., television picture tubes, include a thin layer of aluminium deposited on the back surface of their intern ... Read »


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    • Amplification factor

    • In structural engineering the amplification factor is the ratio of second order to first order deflections. The amplification factor, also called gain, is the extent to which an analog amplifier boosts the strength of a signal. In calculations this is represented by the symbol AF In numerical analysis the amplificat ... Read »


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    • Anchor portal

    • An anchor portal or H-frame tower is a structure supporting overhead power lines in a switchyard. Their static function is similar to a dead-end tower. Anchor portals are almost always steel-tube or steel-framework constructions. anchor pylon and anchor portal, 380kV anchor gantry, 110kV diagonal frame ... Read »


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    • The Ancient Engineers

    • The Ancient Engineers

      The Ancient Engineers is a 1963 science book by L. Sprague de Camp, one of his most popular works. It was first published by Doubleday and has been reprinted numerous times by other publishers. Translations into German and Polish have also appeared. Portions of the work had previously appeared as articles in the magazi ... Read »


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    • Arnold Anderson (scientist)

    • Arnold Anderson was a Six Nations Tuscarora tribal member who worked as a chemical engineer on the Manhattan Project to help the United States develop the first atomic bombs. He was president and founding member of the American Indian Science and Engineering Society which was founded in 1977 with six other American Ind ... Read »


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    • Annubar

    • A Rosemount Annubar primary element is an averaging Pitot tube similar to a single point pitot tube used to measure the flow of gas, steam, or liquid in a pipe. An Annubar primary element or Annubar averaging Pitot tube provides better accuracy than single point Pitot tubes. The Pitot tube measures the difference betw ... Read »


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    • ANSA Pre-processor

    • ANSA is a computer-aided engineering tool for Finite Element Analysis and CFD Analysis widely used in the automotive industry. It is developed by the BETA CAE Systems S.A., Greece. In the United States, it is distributed by Beta CAE Systems, USA, based in Farmington Hills, Michigan. ANSA maintains the association betw ... Read »


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    • Aquatic and environmental engineering

    • Aquatic and environmental engineering; an engineering topic, used sometimes as a synonym for Civil engineering by some universities in Sweden, since the word 'civil engineer' often refers to an engineering degree. Aquatic engineering is where the engineer studies that of oceanography, and aquatic life in the area of ... Read »


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    • Army engineering maintenance

    • Army engineering maintenance consists of those engineers, technicians, and military organizations responsible for the expert repair and maintenance of army vehicles, weapon systems, and other equipment. Army engineering maintenance should not be confused with military engineering which is distinctly separate and analo ... Read »


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    • Asset integrity management systems

    • Asset Integrity Management Systems (AIMS) outline the ability of an asset to perform its required function effectively and efficiently whilst protecting health, safety and the environment and the means of ensuring that the people, systems, processes, and resources that deliver integrity are in place, in use and will pe ... Read »


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    • Association of Professional Engineers and Geoscientists of Saskatchewan

    • The Association of Professional Engineers and Geoscientists of Saskatchewan (APEGS) is the regulatory body for professional engineers and geoscientists in the Canadian province of Saskatchewan. It is a member of Engineers Canada. ... Read »


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    • ASTM A795

    • ASTM A795 is an ASTM specification for steel pipe to be used in fire sprinkler systems. It is available in a black lacquer finish, or with a hot-dipped zinc coating. Sizes are specified using the nominal pipe size system. ... Read »


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    • Atomically precise manufacturing

    • Atomically Precise Manufacturing (APM) is the production of materials, structures, devices, and finished goods in a manner such that every atom is at its specified location relative to the other atoms, and in which there are no defects, missing atoms, extra atoms, or incorrect (impurity) atoms. ... Read »


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    • Average rectified value

    • In electrical engineering, the average rectified value (ARV) of a quantity is the average of its absolute value. The average of a symmetric alternating value is zero and it is therefore not useful to characterize it. Thus the easiest way to determine a quantitative measurement size is to use the average rectified valu ... Read »


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    • Babtie, Shaw and Morton

    • Babtie, Shaw and Morton was a firm of civil engineers based in Glasgow, Scotland, and noted for its work on bridges, dams and reservoirs. It took its name following the 1906 merger of Babtie & Bonn (a partnership founded by John Babtie and Carl Bonn in 1897) and Shaw & Morton (founded by William Shaw and Hugh Morton). ... Read »


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    • Back-up ring

    • A back-up ring is a rigid ring that holds an elastomeric seal or plastic (such as Polyethylene) connection to its designed shape and in its correct place. Back up rings are commonly used with O-rings, lip seals, and as reciprocating shaft seals. They are also used for piping connections joining two different materials ... Read »


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    • Balance of plant

    • Balance of plant (BOP) is a term generally used in the context of power engineering to refer to all the supporting components and auxiliary systems of a power plant needed to deliver the energy, other than the generating unit itself. These may include transformers, inverters, supporting structures etc., depending on th ... Read »


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    • Bald arch

    • Bald arch is a technical term used by engineers to describe the decay of the crucial keystones in medieval buildings, particularly churches and cathedrals. Many attribute the decay to low pitch vibrations produced by late 19th Century pipe organs, the proliferation of the 32 feet pipe particularly responsible, alt ... Read »


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    • Ballistic limit

    • The ballistic limit or limit velocity is the velocity required for a particular projectile to reliably (at least 50% of the time) penetrate a particular piece of material. In other words, a given projectile will generally not pierce a given target when the projectile velocity is lower than the ballistic limit. The term ... Read »


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    • Bar-link chain

    • A bar-link chain, also called a block-and-bar chain or a block chain, is a mechanical drive chain. It is composed of side plates, where each plate straddles one end of a block and is connected to the block with a pin going through a hole at one end of the block. Bar-link chains are simple, and often heavier and less ef ... Read »


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    • Basic dimension

    • In technical drawing, a basic dimension is a theoretically exact dimension, given from a datum to a feature of interest. In Geometric dimensioning and tolerancing, basic dimensions are defined as a numerical value used to describe the theoretically exact size, profile, orientation or location of a feature or datum targ ... Read »


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    • Basic service element

    • In telecommunication, a basic service element (BSE) is: BSEs constitute optional capabilities to which the customer may subscribe or decline to subscribe. ... Read »


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    • Beam and block

    • Beam and block is a construction method to support flooring, especially for ground floors. It is made of cast concrete, one piece of which is an inverted T-shape beam, the other piece being a simple rectangular block. The blocks are placed at regular intervals and the beams placed between them to form a connection betw ... Read »


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    • Bearing reducer

    • A Bearing reducer is a bearing that designates the full integration of high-precision reduction gear and high-precision radial-axial bearing in a compact unit. This transmission system allows the utilization of the bearing reducer in several technics, such as robotics and automation, machine tools, measuring equipment, ... Read »


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    • Bendora Gravity Main

    • The Bendora Gravity Main is a water main located in the Australian Capital Territory, Australia. Water in the water main travels 19.3 kilometres (12.0 mi) from the Bendora Dam via gravity to the treatment plant on Mount Stromlo, adjacent to the Cotter Dam pumping station, upstream from the confluence of the Cotter ... Read »


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    • Beyond design-basis

    • Beyond design-basis is a term used in engineering, especially the design of nuclear power plants, to describe conditions or a significant event in which a system, structure or component (SSC) was not designed or intended to safely operate, contrasted to a design basis accident. Such conditions could reduce or eliminate ... Read »


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    • Beyond Fear: Thinking Sensibly About Security in an Uncertain World

    • Beyond Fear: Thinking Sensibly About Security in an Uncertain World is a non-fiction book by Bruce Schneier, published in 2003. The book grew out of an Atlantic Monthly article by Charles Mann. Beyond Fear presents a five-step process for evaluating the value of a countermeasure against security attacks. The book is di ... Read »


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    • Bio-geoengineering

    • Bio-geoengineering is a form of climate engineering which seeks to use or modify plants or other living things to modify the Earth's climate. Bio-energy with carbon storage, afforestation projects, and ocean nourishment (including iron fertilization) could be considered examples of bio-geoengineering. Biogenic aeroso ... Read »


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    • A Biographical Dictionary of Civil Engineers

    • A Biographical Dictionary of Civil Engineers in Great Britain and Ireland discusses the lives of the people who were concerned with building harbours and lighthouses, undertook fen drainage and improved river navigations, built canals, roads, bridges and early railways, and provided water supply facilities. Volume One, ... Read »


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    • Biomechanical engineering

    • Biomechanics is the study of biological systems such as the human body, combined with the study of mechanics, or mechanical applications. Using the skills learned from biology, engineering and physics to research and develop for health care, such as organs that have been made from artificial materials, or new advanc ... Read »


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    • Biomedical Engineering Society

    • BMES (the Biomedical Engineering Society) is the professional society for students, faculty, researcher and industry working in the broad area of biomedical engineering. BMES is the leading biomedical engineering society in the United States and was founded on February 1, 1968 "to promote the increase of biomedical eng ... Read »


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    • Bistable structure

    • In mechanical engineering, a bistable structure is one that has two stable mechanical shapes, particularly where they are stabilized by different curvature axes. A common example of a bistable structure is a slap bracelet. Bistable structures enable long tube-like structures to roll up into small cylinders. ... Read »


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    • Blackman's theorem


    • Blocks to Robots

    • Blocks to Robots: Learning with Technology in the Early Childhood Classroom (2008) is an educational guide book by Marina Umaschi Bers that introduces the idea of learning with technology in the early childhood classroom. Research shows that attitudes about science, math, and technology start to form during early educ ... Read »


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    • Blow down facility

    • A blow down facility is a testing facility that relies on charging an energy reservoir (often a tank of pressurized gas) and releasing the energy over a relatively short time to produce test conditions at higher energy release rates than can be maintained continuously. Impulse facilities are a special case of blow down ... Read »


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    • Blow fill seal

    • Blow-Fill-Seal (BFS) technology is a manufacturing technique used to produce small, (0.1mL) and large volume, (500mL +) liquid-filled containers. Originally developed in Europe in the 1930s, it was introduced in the United States in the 1960s, but over the last 20 years it has become more prevalent within the pharmaceu ... Read »


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    • Boston Society of Civil Engineers

    • The Boston Society of Civil Engineers, now the Boston Society of Civil Engineers Section of the American Society of Civil Engineers was established in 1848. It claims to be the oldest engineering society in the United States by four years, and has over 4,000 members. According to the ASCE 150th anniversary publication ... Read »


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    • Boundary friction

    • Boundary friction occurs when a surface is at least partially wet, but not so lubricated that there is no direct friction between two surfaces. When two consistent, unlubricated surfaces slide against each other, there is a specific, predictable amount of friction that occurs. This amount increases as velocity does, b ... Read »


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    • Box truss

    • A box truss is a structure composed of three or more chords connected by transverse and/or diagonal structural elements. Box trusses are commonly used in certain types of aircraft fuselages, electric power pylons, large radio antennas, and many bridge structures. (For various truss arrangements used see truss bridge.) ... Read »


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    • Brake shoe

    • A brake shoe is the part of a braking system which carries the brake lining in the drum brakes used on automobiles, or the brake block in train brakes and bicycle brakes. The brake shoe carries the brake lining, which is riveted or glued to the shoe. When the brake is applied, the shoe moves and presses the lining ... Read »


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    • Bridge management system

    • "Bridge management" redirects here. A bridge management system or BMS is a means for managing bridges throughout design, construction, operation and maintenance of the bridges. As funds available become tighter, road authorities around the world are facing challenges related to bridge management and the escalating mai ... Read »


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    • The Bridge: The Building of the Verrazano–Narrows Bridge


    • Britalus rotary engine

    • The Britalus rotary engine was invented in 1982 by Kenneth W. Porter, P.E., M.S.A.E, of King County, Washington. It operates on a modified Brayton cycle, but with continuous pulsed combustion, similar to that of a gas turbine. It can burn most commonly available hydrocarbon fuels and features the high compression ratio ... Read »


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    • British Iron and Steel Research Association

    • The British Iron and Steel Research Association or BISRA, formed in 1944, was the research arm of the British steel industry. It had headquarters in London, originally at 11 Park Lane, later moved to 24 Buckingham Gate, with Laboratories in Sheffield on Hoyle Street,Swansea, Teesside, and Battersea. The organization wa ... Read »


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    • Brushless electric motor

    • A brushless electric motor is an electric motor driven by an electrical input, which lacks any form of commutator or slip ring. The motor requires some form of alternating current to turn, either from an AC supply, or an electronic circuit. A brushless DC electric motor contains a synchronous motor and integrated powe ... Read »


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    • Bubblegram

    • A bubblegram (a.k.a. laser crystal, 3D crystal engraving or vitrography) is a solid block of glass or transparent plastic that has been exposed to laser beams to generate three-dimensional designs inside. The image is composed of many small points of fracture or other visible deformations and appears to float inside th ... Read »


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    • Buckling-restrained braced frame

    • Buckling-restrained braced frame (BRBF) is a structural steel frame that provides lateral resistance to buckling, particularly during seismic activity. The BRBF is typically a special case of a concentrically braced frame. Tests have demonstrated BRBF systems are highly effective for energy dissipation, while being vu ... Read »


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    • Constantin Budeanu

    • Constantin Budeanu (28 February 1886 - 1959) was a Romanian electrical engineer who contributed to the analysis of electric networks states and the SI system of units. He studied electricity in Paris with a V. Adamachi scholarship gained after the completion of studies in Bucharest. He proposed the unit electric r ... Read »


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    • Building lifecycle management

    • Building lifecycle management or BLM is the adaptation of product lifecycle management (PLM)-like techniques to the design, construction, and management of buildings. Building lifecycle management requires accurate and extensive building information modeling (BIM). Life-cycle management of the built environment requir ... Read »


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    • Bulging factor

    • Bulging factor is an engineering term describing the geometry of out-of plane deformations of the surface of a crack on a pressurized fuselage structure. It is used in evaluating the damage tolerance of airframe fuselages. The single curved geometry and pressure differential causes a longitudinal crack to bulge out or ... Read »


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    • Bureau of Engineer Surveyors

    • The Bureau of Engineering Surveyors is the professional sector of the Society of Operations Engineers (SOE) for Engineer Surveyors, but also allied professionals in building services and engineering safety. It was founded in 1965 and merged with other societies to form the SOE in 2000. Its members check machinery and f ... Read »


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    • Burst mode (computing)

    • Burst mode (alternatively burst-mode) is a generic electronics term referring to any situation in which a device is transmitting data repeatedly without going through all the steps required to transmit each piece of data in a separate transaction. The usual reason for having a burst mode capability, or using burst mode ... Read »


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    • Cage aerial

    • A cage antenna (british cage aerial) is a radio antenna that consists of the top portion of a tower or mast and of several parallel wires, which are radially arranged around the lower part of the mast. One advantage of the cage aerial is that the supporting tower can be grounded, allowing it to be used for other radio ... Read »


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    • Calibrated orifice

    • A calibrated orifice is a restriction that is deliberately placed into a system of pipes to set the flow rate through the system. The may be designed to produce proportional flow (as in the jet in a carburetor), or choked flow (as in a filtering bypass in a closed industrial cooling system, which might be designed to ... Read »


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    • Caliduct

    • Caliducts were a kind of pipes, or canals, placed along the walls of houses and apartments, used by the ancients for the conveyance of heat to several remote parts of the house, from one common furnace.  This article incorporates text from a publication now in the public domain: Chambers, Ephraim, ed. (1728). "a ... Read »


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    • Capacitor voltage transformer

    • A capacitor voltage transformer (CVT or CCVT), is a transformer used in power systems to step down extra high voltage signals and provide a low voltage signal, for metering or operating a protective relay. In its most basic form, the device consists of three parts: two capacitors across which the transmission line ... Read »


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    • Cardington test

    • The Cardington Fire Tests were a series of large-scale fire tests conducted in real structures (wood, steel-concrete composite and concrete) at the BRE Cardington facility near Cardington, Bedfordshire, England. during the mid 1990s. After the tests, extensive computational and analytical studies of the behaviour of st ... Read »


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    • Carpentier joint

    • A carpentier joint is a hinge consisting of several thin metal strips of curved cross section. It has two configurations: closed and open. The defining property of the joint is that it is self-opening, does not need mechanical elements such as guides, and maintains a certain degree of stiffness when in the open configu ... Read »


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    • Casing shoe

    • In oil drilling and borehole mining, a casing shoe or guide shoe is a bull-nose shaped device which is attached to the bottom of the casing string. A casing hanger, which allows the casing to be suspended from the wellhead, is attached to the top of the casing. ... Read »


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    • CCNP

    • A Cisco certified network professional (CCNP) is someone in the IT industry who has achieved a the professional level of Cisco career certification, which is a type of IT professional certification created by Cisco Systems, best for Network Operations Specialist, Network administrators & engineers. There are eight ... Read »


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    • Cement accelerator

    • A cement accelerator is an admixture for the use in concrete, mortar, rendering or screeds. The addition of an accelerator speeds the setting time and thus cure time starts earlier. This allows concrete to be placed in winter with reduced risk of frost damage. Concrete is damaged if it does not reach a strength of 500 ... Read »


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    • Ceramic valve

    • A ceramic valve is a valve with ceramic trim, ball, seat, disc or lining. A carbon or stainless steel body is used to protect the ceramic trim from being damaged by sudden thermal or mechanical shock. Advanced ceramics are used in the manufacture including alumina,zirconia and silicon nitride. Significant benefits of t ... Read »


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    • Certified Quality Engineer

    • Certified Quality Engineer, often abbreviated CQE, is a certification given by the American Society for Quality. These engineers are professionally educated in quality engineering and quality control. They are trained in researching and preventing unnecessary costs through lack of quality, lost production costs, lost ... Read »


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    • Chicago fitting

    • A Chicago fitting (also called a Duck's foot fitting due to its shape) is a one quarter turn fitting used for attaching hoses or piping together. Chicago fittings are used on both low to medium pressure gas and fluid lines. The advantages of the Chicago fitting are that it can be used in a wide range of industries and ... Read »


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    • Chilton and Colburn J-factor analogy

    • Chilton–Colburn J-factor analogy is a successful and widely used analogy between heat, momentum, and mass transfer. The basic mechanisms and mathematics of heat, mass, and momentum transport are essentially the same. Among many analogies (like Reynolds analogy, Prandtl–Taylor analogy) developed to directly re ... Read »


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    • Choke ring antenna

    • A choke ring antenna is a particular form of omnidirectional antenna for use at high frequencies. It consists of a number of conductive concentric cylinders around a central antenna. Due to its delicate construction, it is often enclosed in a protective cover or radome when placed outside and exposed to the elements. ... Read »


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    • Civil drawing

    • A civil drawing, or site drawing, is a type of technical drawing that shows information about grading, landscaping, or other site details. These drawings are intended to give a clear picture of all things in a construction site to a civil engineer. Civil drafters prepare drawings and topographical and relief maps used ... Read »


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    • Clarkstown radio transmitter

    • Clarkstown

      The Clarkstown radio transmitter is a longwave radio transmitter in County Meath, Ireland. It is located some 3.5 km east of the village of Summerhill, in a field south of the R156 regional road at Clarkstown. Constructed in 1988 for the transmission of Atlantic 252 on 252 kHz, it uses one 248-metre-high guyed ... Read »


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    • Classic Volkswagens

    • Classic Volkswagens is a 1998 bestselling Non-Fiction Automobile book, by photographer and author Colin Burnham. It was printed by Osprey Publishing as part of their classic automotive collection in the 1980s and 1990s and made sales of over 250,000. It is the second book in a series of nine automotive books by author ... Read »


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    • Click and go gas spring

    • A gas spring is a type of spring that, unlike a typical metal spring, uses a compressed gas, contained in a cylinder and compressed by a piston, to exert a force. Common applications include automobiles (where they are incorporated into the design of struts that support the weight of hatchback doors while they are ope ... Read »


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    • Coaxial antenna

    • A coaxial antenna (often known as a coaxial dipole) is a particular form of a half-wave dipole antenna, most often employed as a vertically polarized omnidirectional antenna. Arnold B. Bailey was granted the US patent 2,184,729 Antenna System on December 26, 1939 after filing in 1937 for a vertical antenna providi ... Read »


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    • Cobra probe

    • A Cobra probe is a device to measure the pressure and velocity components of a moving fluid. It is a multi-holed pressure probe with rotational axis of the probe shaft coplanar with the measurement plane of the instrument. Because of this geometry, when the instrument is rotated around the shaft's axis, the measurement ... Read »


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    • Cognitive engineering

    • Cognitive engineering was an engineering method used in the 1970s at Bell Labs, focused on how people form a cognitive model of a system based upon common metaphors. As explained by Joseph Henry Condon: The idea is that people form a model. You present them with some instruments, tools, like a faucet, electric stove o ... Read »


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    • Committee on Science, Engineering, and Public Policy

    • The Committee on Science, Engineering, and Public Policy (COSEPUP) is a committee of the United States National Academy of Sciences (NAS), the National Academy of Engineering (NAE), and the Institute of Medicine (IOM). It is chartered by the Academies to address "the concerns and requests of the President's Science Adv ... Read »


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    • Common Arrangement of Work Sections

    • Common arrangement of work sections

      Common Arrangement of Work Sections, first published in 1987, is a construction industry working convention designed to promote standardisation of, and detailed coordination between, bills of quantities and specifications. It is part of an industry-wide coordinated projects information initiative (now managed by the Co ... Read »


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    • Compartmentalization (engineering)

    • When referring to engineering, compartmentalization is the general technique of separating two or more parts of a system to prevent from spreading between or among them. This entails the breaking up of a project or problem into sub classes and sub categories, with the intention of simplifying the task at hand, or to e ... Read »


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    • Compensation (engineering)

    • In engineering, compensation is planning for side effects or other unintended issues in a design. In a more simpler term, it's a "counter-procedure" plan on expected side effect performed to produce more efficient and useful results. The design of an invention can itself also be to compensate for some other existing is ... Read »


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    • Compressive stress

    • In long, slender structural elements — such as columns or truss bars — an increase of compressive force F leads to structural failure due to buckling at lower stress than the compressive strength. Compressive stress has stress units (force per unit area), usually with negative values to indicate the compacti ... Read »


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    • Computer-aided inspection

    • Computer Aided Inspection (CAI) is a new technology that enables one to develop a comparison of a physical part to a 3D CAD model. This process is faster, more complete, and more accurate than using a Coordinate Measuring Machine (CMM) or other more traditional methods. An automatic inspection method and apparatus usin ... Read »


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    • Concrete Series

    • The Concrete Series was a long-running series of books about the use of concrete in construction that was published by Concrete Publications Limited of Dartmouth Street, London, from the 1930s to the 1960s. The Concrete Series was a book series about the use of concrete in construction that was published by Concre ... Read »


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    • Constant-force spring

    • A constant-force spring is a spring for which the force it exerts over its range of motion is a constant. That is, it does not obey Hooke's law. Generally constant-force springs are constructed as a rolled ribbon of spring steel such that the spring is relaxed when it is fully rolled up. As it is unrolled, the restorin ... Read »


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    • Constrained-layer damping

    • Constrained-layer damping is a mechanical engineering technique for suppression of vibration. Typically a viscoelastic or other damping material, is sandwiched between two sheets of stiff materials that lack sufficient damping by themselves. The ending result is, any vibration made on ether side of the constraining mat ... Read »


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    • The Construction and Principal Uses of Mathematical Instruments

    • The Construction and Principal Uses of Mathematical Instruments

      The Construction and Principal Uses of Mathematical Instruments (French: Traité de la construction et des principaux usages des instrumens de mathématique) is a book by Nicholas Bion, first published in 1709. It was translated into English in 1723 by Edmund Stone. It was described as "the most famous book devote ... Read »


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    • Contextualization (computer science)

    • In computer science, contextualization is an initialization phase permitting one, at instantiation time, to set or override properties having unknown or default values at the time of template creation. Templates permit one to define generic capacities and behavior of objects, and default values for some object propert ... Read »


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    • Continuous facility

    • A continuous facility is a type of testing facility that produces test conditions that can be maintained indefinitely, such as certain types of wind tunnels. In contrast to continuous facilities are blow down facilities that operate only in short bursts at conditions that cannot be maintained continuously. ... Read »


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    • Continuous Monitoring and Adaptive Control

    • Continuous Monitoring and Adaptive Control (CMAC) is a category of stormwater Best Management Practice (BMP) that allows for a wider range of operation of detention and retention ponds. CMAC systems typically consist of a water level sensor, an actuated valve, and an internet connection. Specific applications of CMAC ... Read »


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    • Contraflexure

    • In a bending beam, a point is known as a point of contraflexure if it is a location at which no bending occurs. In a bending moment diagram, it is the point at which the bending moment curve intersects with the zero line. In other words where the bending moment changes its sign from negative to positive or vice versa. ... Read »


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    • Control display unit

    • A Control Display Unit (CDU) is used in remote operated gasfields placed on the seabed. It distributes power, control signals and chemicals arriving through the umbilical and pipelines from land to the other sub-sea structures. The connection point – manifold – in the control distribution unit can be retriev ... Read »


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    • Control panel (engineering)

    • A control panel is a flat, often vertical, area where control or monitoring instruments are displayed. They are found in factories to monitor and control machines or production lines and in places such as nuclear power plants, ships, aircraft and mainframe computers. Older control panels are most often equipped with p ... Read »


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    • Conveyor pulley

    • A conveyor pulley is a mechanical device used to change the direction of the belt in a conveyor system, to drive the belt, and to tension the belt. Modern pulleys are made of rolled shells with flexible end disks and locking assemblies. Early pulley engineering was developed by Josef Sitzwohl in Australia in 1948 an ... Read »


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    • Cooling capacity

    • Cooling capacity is the measure of a cooling system's ability to remove heat. The SI units are watts (W). Another common unit is the ton, which describes the amount of water at a given temperature that can be frozen in a given amount of time. 1 ton of refrigeration is the ability of a refrigerator to freeze 2000 lb of ... Read »


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    • William Corin

    • William Corin (13 October 1867- 2 March 1929) was an English-born electrical engineer, who undertook some of the early design of the Snowy Mountains Hydro-Electricity Scheme in Australia. He was born in Kent, England and was educated at King's College School and University College, London. He worked as a civil enginee ... Read »


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    • Coupling (piping)

    • A coupling (or coupler) (used in piping or plumbing) is a very short length of pipe or tube, with a socket at one or both ends that allows two pipes or tubes to be joined, welded (steel), brazed or soldered (copper, brass etc.) together. Alternatively it is a short length of pipe with two female National pipe threads ... Read »


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    • Coupling nut

    • A coupling nut, also known as extension nut, is a threaded fastener for joining two male threads, most commonly a threaded rod, but also pipes. The outside of the fastener is usually a hex so a wrench can hold it. Variations include reducing coupling nuts, for joining two different size threads; sight hole coupling nut ... Read »


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    • Crack arrestor

    • In materials science and material fatigue, a crack arrestor or rip-stop doubler is a structurally strong ring or strip of material which serves to contain stress cracking that could lead to catastrophic failure of a device. The crack arrestor can be as simple as a thickened region of metal, or may be constructed of a ... Read »


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    • Criticality matrix

    • In operations research and engineering, a criticality matrix is a representation (often graphical) of failure modes along with their probabilities and severities. For example, an aircraft might have the following matrix: ... Read »


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    • Crystal River Engineering

    • Crystal River Engineering Inc. was an American technology company best known for their pioneering work in HRTF based real-time binaural, or 3D sound processing hardware and software. The company was founded in 1989 by Scott Foster after he received a contract from NASA to create the audio component of VIEW (Virtual Env ... Read »


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    • CrystEngCommunity

    • CrystEngCommunity is a virtual web community for people working in the field of crystal engineering. The website is owned by the Royal Society of Chemistry (RSC). Also on the community are links to research articles on crystal engineering including CrystEngSelects (a selection of recent articles of interest to crystal ... Read »


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    • Cutting ring fitting

    • Cutting ring fittings are flareless fittings used for connections in fluid applications. They are widely used worldwide in hydraulic systems. The cutting ring fitting consists of the body, the cutting ring and the nut. On assembly, the two cutting edges of the cutting ring carves into the outer surface of the tube hen ... Read »


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    • Cyanometer

    • A cyanometer (from cyan and -meter) is an instrument for measuring 'blueness', specifically the colour intensity of blue sky. It is attributed to Horace-Bénédict de Saussure and Alexander von Humboldt. It consists of squares of paper dyed in graduated shades of blue and arranged in a color circle or square that c ... Read »


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    • Dalén light


    • Damping matrix

    • In applied mathematics, a damping matrix is a matrix corresponding to any of certain systems of linear ordinary differential equations. A damping matrix is defined as follows. If the system has n degrees of freedom un and is under application of m damping forces. Each force can be expressed as follows: It yields in ... Read »


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    • Damping torque

    • Damper is a generic term used to identify any mechanism used for vibration energy absorption, the shaft vibration suppression, soft start and overload protection device. In order to design an efficient damper, it is imperative that the damping torque is calculated first. Damping torque or damping forces is the speed de ... Read »


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    • Adam Ty Dean Smith

    • Adam Ty Dean Smith (better known as Adam Dean Smith) is an automobile designer. He has worked with Ford Motor Company and HSV (Holden Special Vehicles). He became Wheels Magazine's Young Designer of the Year in October 2005 with his winning entry, the Hybrid SUV 'Ford Punk' (WADA: Wheels Automoitive Design Awards, part ... Read »


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    • Decision-matrix method

    • The decision-matrix method, also Pugh method or Pugh Concept Selection, invented by Stuart Pugh, is a qualitative technique used to rank the multi-dimensional options of an option set. It is frequently used in engineering for making design decisions but can also be used to rank investment options, vendor options, produ ... Read »


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    • Degree of saturation (traffic)

    • In traffic engineering, the degree of saturation of an intersection (typically under traffic signal control) or road is a measure of how much demand it is experiencing compared to its total capacity. The degree of saturation (%) is a ratio of demand to capacity on each approach to the junction, with a value of 100% me ... Read »


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    • Design choice

    • In engineering, a design choice is a possible solution to a problem. Given a design task and a governing set of criteria (design specifications), several conceptual designs may be drafted. Each of these preliminary concepts is a potential design choice. Many never advance beyond the preliminary phase; those that are de ... Read »


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    • Design review

    • A design review is a milestone within a product development process whereby a design is evaluated against its requirements in order to verify the outcomes of previous activities and identify issues before committing to - and if need to be re-prioritise - further work. The ultimate design review, if successful, therefor ... Read »


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    • Detailed engineering

    • Detailed engineering are studies which creates a full definition of every aspect of a project development. It includes all the studies to be performed before project construction starts. Detail engineering studies are a key component for every project development across Mining, Infrastructure, energy, oil&gas sectors. ... Read »


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    • Diagonal scale

    • Diagonal scale is an engineering measuring instrument which is composed of a set of parallel straight lines which are obliquely crossed by another set of straight lines. Diagonal scales are used to measure small fractions of the unit of measurement. Diagonal scale is derived from the Latin word Diagonalis. The Lat ... Read »


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    • Diamond grinding

    • Diamond grinding is a grinding process that can be applied to a variety of surfaces including floors, stones and engineering ceramics. It takes advantage of the fact that diamond has the highest hardness of any bulk material. ... Read »


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    • Diaphragm (structural system)

    • In structural engineering, a diaphragm is a structural element that transmits lateral loads to the vertical resisting elements of a structure (such as shear walls or frames). Diaphragms are typically horizontal, but can be sloped such as in a gable roof on a wood structure or concrete ramp in a parking garage. The diap ... Read »


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    • Die preparation

    • Die preparation is a step of semiconductor device fabrication during which a wafer is prepared for IC packaging and IC testing. The process of die preparation typically consists of two steps: wafer mounting and wafer dicing. Wafer mounting is a step that is performed during the die preparation of a wafer as part o ... Read »


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    • Dielectric withstand test

    • A dielectric withstand test or "high potential" or "hipot" test is an electrical test performed on a component or product to determine the effectiveness of its insulation. The test may be between mutually insulated sections of a part or energized parts and electrical ground. The test is a means to qualify a device's ab ... Read »


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    • Direct displacement control pump

    • A direct displacement control pump is a kind of axial piston pump with a direct displacement control. A direct displacement control uses a mechanical lever attached to the swashplate of the axial piston pump. Higher system pressures require more force to move that lever, making direct displacement control only suitable ... Read »


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    • Disappearing-filament pyrometer

    • The disappearing-filament pyrometer is an optical pyrometer, in which the temperature of a glowing incandescent object is measured by comparing it to the light of a heated filament. Invented independently in 1901 by Ludwig Holborn and Ferdinand Kurlbaum in Germany and Harmon Northrup Morse in the United States, it was ... Read »


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    • Dissipator (building design)

    • A dissipator is a device mounted among some sections of a building to reduce strains during an earthquake by slowing down the shaking of the building. During an earthquake, the sections of the building are subjected to movements which are relative to each other (for instance, the relative movement between two different ... Read »


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    • Distribution uniformity

    • Distribution Uniformity or DU in irrigation is a measure of how uniformly water is applied to the area being watered, expressed as a percentage. The distribution uniformity is often calculated when performing an irrigation audit. The DU should not be confused with the coefficient of uniformity (CU) which is often prefe ... Read »


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    • Double subscript notation

    • In engineering, double-subscript notation is notation used to indicate some variable between two points (each point being represented by one of the subscripts). In electronics, the notation is usually used to indicate the direction of current or voltage, while in mechanical engineering it is sometimes used to describe ... Read »


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    • Downton pump

    • The Downton pump is type of positive displacement pump patented in 1825 by Jonathan Downton. It was typically used on ships. The design of the Downton pump sought to create a more constant flow of pumped liquid, and a steadier load-state on the pump, by increasing the number of buckets operating in the pump. These buc ... Read »


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    • Dual piping

    • Dual piping is a system of plumbing installations used to supply both potable and reclaimed water to a home or business. Under this system, two completely separate water piping systems are used to deliver water to the user. This system prevents mixing of the two water supplies, which is undesirable, since reclaimed wat ... Read »


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    • Dublin Accord

    • The Dublin Accord is an agreement for the international recognition of Engineering Technician qualifications. In May 2002, the national engineering organisations of Ireland, the United Kingdom, South Africa and Canada signed an agreement mutually recognising the qualifications which underpin the granting of Engineerin ... Read »


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    • Dühring's rule


    • ECAT Pakistan

    • Engineering College Admission Test (ECAT) is conducted in Pakistan each year for Pre-Engineering students. ECAT is conducted by University of Engineering and Technology in Punjab. Each year some 45000 students attempt this test. While there are some 3000 seats in Engineering colleges of Punjab, Pakistan. Entry test is ... Read »


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    • École nationale des sciences appliquées d'Al Hoceima


    • Eddy-current sensor

    • Eddy current sensors uses the principle of eddy current formation to sense displacement. Eddy currents are formed when a moving or changing magnetic field intersects a conductor or vice versa. The relative motion causes a circulating flow of electrons, or currents, within the conductor. These circulating eddies of curr ... Read »


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    • Edge case

    • An edge case is a problem or situation that occurs only at an extreme (maximum or minimum) operating parameter. For example, a stereo speaker might noticeably distort audio when played at its maximum rated volume, even in the absence of other extreme settings or conditions. An edge case can be expected or unexpected. ... Read »


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    • Electrical drawing

    • An electrical drawing, is a type of technical drawing that shows information about power, lighting, and communication for an engineering or architectural project. Any electrical working drawing consists of "lines, symbols, dimensions, and notations to accurately convey an engineering's design to the workers, who instal ... Read »


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    • Safe Torque Off

    • The Safe Torque Off (STO) is an electronic signal used in industrial motor drives for safety reasons. The STO function is the most common and basic drive-integrated safety function. It ensures that no torque-generating energy can continue to act upon a motor and prevents unintentional starting ... Read »


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    • Electrostatic plotter

    • An electrostatic plotter is a type of plotter that draws images on paper with an electrostatic process. They are most frequently used for Computer-Aided Engineering (CAE), producing raster images via either a Liquid Toner or a Dry Toner model. Liquid Toner models use toner that is positively charged and thus becomes a ... Read »


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    • Elevator test tower

    • An elevator test tower is a structure usually 100 to 140 metres tall that is designed to evaluate the stress and fatigue limits of specific elevator cars in a controlled environment. Tests are also carried out in the test tower to ensure reliability and safety in current elevator designs and address any failures that m ... Read »


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    • EN 1090

    • The EN 1090 standards are European standards that regulate the fabrication and assembly of steel and aluminium structures and are recognized by the Construction Products Regulation 2011 (CPR). EN 1090 comprises three parts: EN 1090 replaced the nationally applicable regulations, e.g. in Germany DIN 18800-7 and DIN V ... Read »


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    • EN 10034

    • The EN 10034 "Structural steel I and H sections. Tolerances on shape and dimensions" is an European Standard. The standard is developed by the technical committee ECISS/TC 103 - Structural steels other than reinforcements. ... Read »


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    • EN 10080

    • The EN 10080: Steel for the reinforcement of concrete is a European Standard. This standard is referenced by EN 1992. ... Read »


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    • EN 13445

    • EN 13445 - Unfired Pressure Vessels is a standard that provides rules for the design, fabrication, and inspection of pressure vessels EN 13445 consists of 8 parts: Parts 7 and 9 do exist but they are merely technical reports. EN 13445-10:2015 : Unfired pressure vessels - Part 10: Additional requirements for press ... Read »


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    • Energy separating agent

    • In chemical separation processes, an Energy separating agent (ESA) is the heat or shaft work added to facilitate the separation of two chemical species. It is contrasted with a mass separating agent, which is any chemical species added to the reaction that facilitates the reaction. ESAs are used in many common separati ... Read »


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    • Engine shaft

    • An engine shaft is a mine shaft used for the purpose of pumping, irrespective of the prime mover. ... Read »


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    • Engineering and Physical Sciences

    • The Division of Engineering and Physical Sciences is a part of the National Research Council, which serves as an independent adviser to the President, the Congress and federal agencies on scientific and technical questions of national importance. The National Research Council is jointly administered by the National Aca ... Read »


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    • Engineering and the Mind's Eye


    • Engineering apprentice

    • An engineering apprenticeship in the United Kingdom is an apprenticeship in mechanical engineering or electrical engineering or aeronautical engineering to train craftsmen, technicians, senior technicians, Incorporated Engineers and Chartered Engineer for vocational oriented work and professional practice. Chartered En ... Read »


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    • Engineering bill of materials

    • An engineering bill of materials (EBOM) is a type of bill of materials (BOM) reflecting the product as designed by engineering, referred to as the "as-designed" bill of materials. The EBOM is not related to modular BOM or configurable BOM (CBOM) concepts, as modular and configurable BOMs are used to reflect selection ... Read »


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    • Engineering controls

    • Engineering controls are strategies designed to protect workers by removing hazardous conditions or by placing a barrier between the worker and the hazard. Three basic strategies are: substitution, isolation, and ventilation. Controlling exposures to hazards can protect workers. A hierarchy of controls is used as a fr ... Read »


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    • Engineering cybernetics

    • Engineering cybernetics or technical cybernetics, established by H.S. Tsien, is a field of cybernetics, which deals with the question of control engineering of mechatronic systems as well as chemical or biological systems. It is used to control and predict the behaviour of such a system; see control theory. An example ... Read »


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    • Engineering research

    • Engineering research seeks improvements in theory and practice in fields such as (for example) high-speed computation, bioengineering, earthquake prediction, power systems, nanotechnology and construction. Major contributors to engineering research around the world include governments, private business, and academia. ... Read »


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    • Engineering science and mechanics

    • Engineering Science and Mechanics (ESM) is a multidisciplinary and interdisciplinary engineering program and/or academic department at the Pennsylvania State University, University of Virginia, Virginia Polytechnic Institute and State University, Georgia Institute of Technology, or University of Alabama. A B.S., M.S., ... Read »


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    • EngineeringUK

    • EngineeringUK

      EngineeringUK, formerly the Engineering and Technology Board (ETB), is an independent, not-for-profit organisation whose purpose is to promote the contribution that engineers, and engineering and technology, make to society. Working within the United Kingdom, EngineeringUK aims to inspire people at all levels to pursue ... Read »


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    • Entrainment (engineering)

    • In engineering, entrainment is the entrapment of one substance by another substance. For example: ... Read »


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    • Equivalent dumping coefficient

    • An equivalent dumping coefficient is a mathematical coefficient used in the calculation of the energy dispersed when a structure moves. As a civil engineering term, it defines the percent of a cycle of oscillation that is absorbed (converted to heat by friction) for the structure or sub-structure under analysis. Usuall ... Read »


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    • ERF damper

    • An ERF damper or electrorheological fluid damper, is a type of quick-response active non-linear damper used in high-sensitivity vibration control. ... Read »


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    • Erosion corrosion

    • Erosion corrosion is a degradation of material surface due to mechanical action, often by impinging liquid, abrasion by a slurry, particles suspended in fast flowing liquid or gas, bubbles or droplets, cavitation, etc. The mechanism can be described as follows: The mechanism of erosion corrosion, the materials affecte ... Read »


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    • Ethylenediamine pyrocatechol

    • Ethylenediamine pyrocatechol (EDP), also known as ethylenediamine-pyrocatechol-water (EPW), is an anisotropic etchant solution for silicon. A typical formulation consists of ethylenediamine, pyrocatechol, pyrazine and water. It is carcinogenic and very corrosive. It is mainly used in research labs, and is not used in m ... Read »


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    • Etteh Aro and Partners Consulting Engineers

    • The Etteh Aro and Partners Consulting Engineers is a civil engineering consultancy, headquartered in Ibadan, the capital of Oyo State southwestern Nigeria. The firm was established on 29 April 1970 by the late Lawrence Oluwawemimo Arokodare in partnership with Engr. Ikpong Ikpong Etteh. In early 1970's, the firm awarde ... Read »


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    • Euphrates Tunnel

    • The Euphrates Tunnel was allegedly a 929 meter long tunnel built to connect the two halves of the city of Babylon; archaeologists believe it was built between 2180 and 2160 BCE. Construction began with a temporary dam across the Euphrates river, and proceeded using a "cut and cover" technique. The tunnel was supposedly ... Read »


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    • Event tree

    • Event tree is an inductive analytical diagram in which an event is analyzed using Boolean logic to examine a chronological series of subsequent events or consequences. For example, event tree analysis is a major component of nuclear reactor safety engineering. An event tree displays sequence progression, sequence end ... Read »


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    • Excess Noise Ratio

    • The term Excess Noise Ratio is primarily used in connection with noise diodes which are a common method of measuring the noise performance of an amplifier. The measurement technique is described in detail in application notes such as Keysight Application note 57-2 "Noise Figure Measurement Accuracy - The Y-Factor metho ... Read »


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    • Expanded metal

    • Expanded metal is a type of metal which has been squeezed and stretched to form a diamond pattern of metal wire-like material. This material is commonly used for walkways and fences. Expanded metal is stronger than wire because the material is flattened allowing the metal to stay solid. The other benefit to expande ... Read »


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    • Expansion tube

    • An expansion tube is a type of impulse facility that is conceptually similar to a shock tube with a secondary diaphragm, an expansion section, a test section, and a dump tank where the endwall would be located in a shock tube. It is typically used to produce high enthalpy flows for high speed aerodynamic flow and aerod ... Read »


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    • Fall protection

    • Fall protection is the use of controls designed to protect personnel from falling or in the event they do fall, to stop them without causing severe injury. Typically, fall protection is implemented when working at height, but may be relevant when working near any edge, such as near a pit or hole, or performing work on ... Read »


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    • Fatigue damage spectrum

    • The Fatigue Damage Spectrum (FDS) of a vibration is obtained by tracing the fatigue damage experienced by a linear Single Degree of Freedom System (SDOF) according to its natural frequency, for given damping ratio and for a given value of parameter b (this parameter comes from the Basquin law representing the Wöhler ... Read »


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    • FDOA

    • Frequency difference of arrival (FDOA), also frequently called differential Doppler (DD), is a technique analogous to TDOA for estimating the location of a radio emitter based on observations from other points. (It can also be used for estimating one's own position based on observations of multiple emitters). TDOA and ... Read »


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    • Fender pier

    • A fender pier is a structure built to protect another structure from damage, such as by ship collision. ... Read »


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    • FETI

    • In mathematics, in particular numerical analysis, the FETI method (finite element tearing and interconnect) is an iterative substructuring method for solving systems of linear equations from the finite element method for the solution of elliptic partial differential equations, in particular in computational mechanics I ... Read »


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    • Fiberglass reinforced plastic grating

    • Fiberglass reinforced plastic grating (also known as FRP grating, glass reinforced plastic grating or fiberglass grating) is a composite material manufactured by combining a matrix of resin and fiberglass. Fiberglass grating does not corrode like steel grating and is therefore used in corrosive environments to reduce m ... Read »


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    • Fieldwire

    • Fieldwire

      Fieldwire is a mobile collaboration platform designed for construction foremen, superintendents, contractors, and engineers. The application allows field workers to access up-to-date information like drawings, files and tasks directly from the jobsite on their mobile device. The San Francisco, California based st ... Read »


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    • Filling carousel

    • A filling carousel is intended for filling liquefied petroleum gas (LPG) cylinders in large groups. It consist of a frame with running wheels, rails, a central column for LPG and air, and a driving unit the carousel frame around the central column. The speed of the carousel can be adapted to the various filling times a ... Read »


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    • Filling factor

    • Filling factor,  F {\displaystyle ~F~}, is a quantity measuring the efficiency of absorption of pump in the core of a double-clad fiber. The efficiency of absorption of pumping energy in the fiber is an important parameter of a double-clad fiber laser. In many cases this efficiency can be approximated with ... Read »


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    • Fire Dynamics Simulator

    • Fire Dynamics Simulator (FDS) is a computational fluid dynamics (CFD) model of fire-driven fluid flow. The computer program solves numerically a large eddy simulation form of the Navier–Stokes equations appropriate for low-speed, thermally-driven flow, with an emphasis on smoke and heat transport from fires, to de ... Read »


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    • First-order reliability method

    • The first-order reliability method, (FORM), is a semi-probabilistic reliability analysis method devised to evaluate the reliability of a system. The accuracy of the method can be improved by averaging over many samples, which is known as Line Sampling. ... Read »


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    • Flare fitting

    • Flare fittings are a type of compression fitting used with metal tubing, usually soft steel, ductile (soft) copper and aluminum, though other materials are also used.  Tube flaring is considered to be a type of forging operation, and is usually a cold working procedure.  During assembly, a flare nut is used to se ... Read »


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    • Flexible debris-resisting barrier

    • Flexible debris-resisting barrier, also known as protective rock barrier fence and rockfall catch fence, is a steel ring net barrier to resist the impact of landslide debris flow or boulders and prevent further downslope flow. Flexible debris-resisting barriers have been adopted as a mitigation measure for retention of ... Read »


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    • Float voltage

    • Float voltage is the voltage at which a battery is maintained after being fully charged to maintain that capacity by compensating for self-discharge of the battery. The voltage could be held constant for the entire duration of the cell's operation (such as in an automotive battery) or could be held for a particular pha ... Read »


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    • Flood control channel

    • Flood control channels are a series of large and empty basins which let water flow in and out (except when a flood is actually present) open-air channels that extend below the street levels of some larger cities, so that if and when a flood occurs, the flood will run into the channels, and proceed to be drained to the ... Read »


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    • Floodway (road)

    • A floodway is a flood plain crossing for a road, built at or close to the natural ground level. They are designed to be submerged under water, but withstand such conditions. Typically floodways are used when the flood frequency or time span is minimal, traffic volumes are low, and the cost of a bridge is uneconomic â ... Read »


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    • Flow control (fluid)

    • Flow control is a major rapidly evolving field of fluid dynamics. It implies a small change of a configuration serving an ideally large engineering benefit, like drag reduction, lift increase, mixing enhancement or noise reduction. This change may be accomplished by passive or active devices. Passive devices, like turb ... Read »


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    • Flow splitter

    • A flow splitter, in hydraulic engineering, is any device designed to break up the flow of water or nappe over a dam wall or weir. Flow splitters are used to reduce the likelihood of nappe vibration that might cause the failure of a dam wall by aerating the water flow. They are also used to restrict large flows of storm ... Read »


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    • Flow stress

    • Flow stress is defined as the instantaneous value of stress required to continue plastically deforming the material - to keep the metal flowing. It is the yield strength of the metal as a function of strain, which can be expressed: Hence, Flow stress can also be defined as the stress required to sustain plastic deform ... Read »


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    • Flushing hydrant

    • A flushing hydrant is a hydrant that is used for a water line of silt, rust, debris, or stagnant water. Many water utilities use standard fire hydrants for flushing their lines. Specialized flushing hydrants are often smaller and less expensive than a fire hydrant to reduce cost where fire fighting use is not needed o ... Read »


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    • Foot-pound (energy)

    • The foot-pound force (symbol: ft·lbf) is a unit of work or energy in the Engineering and Gravitational Systems in United States customary and imperial units of measure. It is the energy transferred upon applying a force of one pound-force (lbf) through a linear displacement of one foot. The corresponding SI unit is ... Read »


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    • Force gauge

    • A force gauge (also force gage) is a small measuring instrument used across all industries to measure the force during a push or pull test. Applications exist in research and development, laboratory, quality, production and field environment. There are two kinds of force gauges today: mechanical and digital force gauge ... Read »


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    • Foundation integrity testing

    • Foundation integrity testing is the non-destructive testing of piled foundations. It was first used in the late 1960s and has been developed over the years by many companies. Three organizations supply a majority of the test equipment in use: CEBTP (Centre Expérimental de Recherches et d'Etudes du Bâtiment et des ... Read »


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    • Free-turbine turboshaft

    • A free-turbine turboshaft is a form of turboshaft or turboprop gas turbine engine where the power is extracted from the exhaust stream of a gas turbine by a separate turbine, downstream of the gas turbine and is not connected to the gas turbine. This is opposed to the power being extracted from the power spool via a ge ... Read »


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    • Frequency domain decomposition

    • The frequency domain decomposition (FDD) is an output-only system identification technique popular in civil engineering, in particular in structural health monitoring. As an output-only algorithm, it is useful when the input data is unknown. FDD is a modal analysis technique which generates a system realization using t ... Read »


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    • Don Freshwater

    • Donald Cole Freshwater (21 April 1924 – 2 August 2004), known as Don Freshwater, was a British professor of chemical engineering. Freshwater was born in Brewood where he attended the Grammar School. He gained a degree in chemistry at Birmingham University in 1944, then took a course in Fuel Technology at the ... Read »


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    • Frontal solver

    • A frontal solver, due to Bruce Irons is an approach to solving sparse linear systems which is used extensively in finite element analysis. It is a variant of Gauss elimination that automatically avoids a large number of operations involving zero terms. A frontal solver builds a LU or Cholesky decomposition of a sparse ... Read »


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    • Fun with Radio

    • Fun with Radio is a book by Gilbert Davey first published in 1957 by Edmund Ward Ltd (London). At a time when radio receivers were still very expensive, and portable radios still a rarity (transistors were just being introduced), the book introduced many youngsters, mainly boys, to radio construction, and in some cases ... Read »


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    • Function (engineering)

    • In engineering, a function is interpreted as a specific process, action or task that a system is able to perform. In the lifecycle of engineering projects, there are usually distinguished subsequently: Requirements and Functional specification documents. The Requirements usually specifies the most important attrib ... Read »


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    • Function–means tree


    • Gamma loop

    • A Gamma loop is a loop about alloys of steel. When adding additives to iron, a stable zone of austenite may increase or decrease. Some additives decrease the Austenite stable zone. In this case, the phase boundary becomes a loop. Adding Gamma loop additives prevents the steel from suffering phase transition to other so ... Read »


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    • Gas-free engineer

    • A gas-free engineer (GFE) is a person who has successfully completed a similarly named training course offered by the United States Navy. The gas-free engineer is thereby qualified to certify a confined space as being safe to enter without the use of an air-purifying or supplied air (SAR/SCBA) respirator. The confined ... Read »


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    • Gear manufacturing

    • Gear manufacturing refers to the making of gears. Gears can be manufactured by a variety of processes, including casting, forging, extrusion, powder metallurgy, and blanking. As a general rule, however, machining is applied to achieve the final dimensions, shape and surface finish in the gear. The initial operations th ... Read »


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    • Geometrically and materially nonlinear analysis with imperfections included

    • Geometrically and materially nonlinear analysis with imperfections included (GMNIA), is a structural analysis method designed to verify the strength capacity of a structure, which accounts for both plasticity and buckling failure modes. GMNIA is currently considered the most sophisticated and perspectively the most acc ... Read »


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    • Global powder metallurgy property database

    • The Global Powder Metallurgy Database (GPMD) is an online searchable database that has been developed as the result of a joint project between leading regional powder metallurgy (PM) trade associations, the EPMA and its sister organisations in Japan (JPMA) and North America (MPIF). This database was created in respons ... Read »


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