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Daniel Jackson (born 1963) is a professor of Computer Science at the Massachusetts Institute of Technology (MIT). He is the principal designer of the Alloy modelling language, and author of the books Software Abstractions: Logic, Language, and Analysis [1] and The Essence of Software. [2]
Positive material identification (PMI) is the analysis of a material, this can be any material but is generally used for the analysis of metallic alloy to establish composition by reading the quantities by percentage of its constituent elements. Typical methods for PMI include X-ray fluorescence (XRF) and optical emission spectrometry (OES). [1]
Alloy specifications can be checked using the Alloy Analyzer. Although Alloy is designed with automatic analysis in mind, Alloy differs from many specification languages designed for model-checking in that it permits the definition of infinite models. The Alloy Analyzer is designed to perform finite scope checks even on infinite models.
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Every 1% by mass of lithium added to aluminium reduces the density of the resulting alloy by 3% and increases the stiffness by 5%. [1] This effect works up to the solubility limit of lithium in aluminium, which is 4.2%. Strain hardening Introducing another type of atom into the crystal strains the lattice, which helps block dislocations. The ...
Differential thermal analysis (DTA) is a thermoanalytic technique that is similar to differential scanning calorimetry. In DTA, the material under study and an inert reference are made to undergo identical thermal cycles, (i.e., same cooling or heating programme) while recording any temperature difference between sample and reference. [ 1 ]
Plutonium in the delta (δ) phase [7] normally exists in the 310 °C to 452 °C range but is stable at room temperature when alloyed with a small percentage of gallium, aluminium, or cerium, enhancing workability and allowing it to be welded in weapons applications. The δ phase has more typical metallic character and is roughly as strong and ...
Aluminium carbide is prepared by direct reaction of aluminium and carbon in an electric arc furnace. [3]4 Al + 3 C → Al 4 C 3. An alternative reaction begins with alumina, but it is less favorable because of generation of carbon monoxide.
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