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Thermo-mechanical fatigue (short TMF) is the overlay of a cyclical mechanical loading, that leads to fatigue of a material, with a cyclical thermal loading. Thermo-mechanical fatigue is an important point that needs to be considered, when constructing turbine engines or gas turbines.
In mathematics, topological modular forms (tmf) is the name of a spectrum that describes a generalized cohomology theory.In concrete terms, for any integer n there is a topological space , and these spaces are equipped with certain maps between them, so that for any topological space X, one obtains an abelian group structure on the set of homotopy classes of continuous maps from X to .
Thulium(II) fluoride is one of the fluoride salts of the lanthanide metal thulium, with the chemical compound of TmF 2.It can react with zirconium tetrafluoride at 900 °C to form TmZrF 6, which has a hexagonal structure. [1]
(h 3 o)tm 3 f 10 → 3 tmf 3 + hf↑ + h 2 o↑ Thulium(III) oxide reacts with fluorinating agents such as hydrogen fluoride , [ 2 ] nitrogen trifluoride [ 3 ] xenon difluoride [ 4 ] to create thullium(III) fluoride as well, although the reaction with nitrogen trifluoride is incomplete and produces a mixture of TmOF and TmF 3 .
A TMF greater than one signifies that accumulation in the organism is greater than that of the medium, with the medium being seawater in this case. PFOS, a long-chain sulfonic acid, was found at the highest concentrations relative to other PFASs measured in fish and birds in northern seas such as the Barents Sea and the Canadian Arctic.
Despite its (mild) radioactivity, thorium fluoride is used as an antireflection material in multilayered optical coatings. It has excellent optical transparency in the range 0.35–12 μm, and its radiation is primarily due to alpha particles, which can be easily stopped by a thin cover layer of another material.
Lead tetrafluoride is a compound of lead and fluorine.The yellow solid (melting point 600 °C) is the only room-temperature stable tetrahalide of lead. [3] Lead tetrafluoride is isostructural with tin(IV) fluoride and contains planar layers of octahedrally coordinated lead, where the octahedra share four corners and there are two terminal, unshared, fluorine atoms trans to one another.
The boiling point of chlorine trifluoride oxide is 29 °C. [9]The shape of the molecule is a trigonal bipyramid, with two fluorine atoms at the top and bottom (apex) (F a) and an electron pair, oxygen and fluorine (F e) on the equator. [7]