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  2. Renormalization group - Wikipedia

    en.wikipedia.org/wiki/Renormalization_group

    e. In theoretical physics, the term renormalization group (RG) refers to a formal apparatus that allows systematic investigation of the changes of a physical system as viewed at different scales. In particle physics, it reflects the changes in the underlying force laws (codified in a quantum field theory) as the energy scale at which physical ...

  3. Fracture mechanics - Wikipedia

    en.wikipedia.org/wiki/Fracture_mechanics

    e. Fracture mechanics is the field of mechanics concerned with the study of the propagation of cracks in materials. It uses methods of analytical solid mechanics to calculate the driving force on a crack and those of experimental solid mechanics to characterize the material's resistance to fracture. Theoretically, the stress ahead of a sharp ...

  4. Röhm Gesellschaft - Wikipedia

    en.wikipedia.org/wiki/Röhm_Gesellschaft

    Firearms, weapons. Owner. Umarex. Röhm Gesellschaft, often referred to as RG, is a German brand of firearms and related shooting equipment. RG developed as a diversification of Röhm GmbH in the 1950s. After 1968, RG Industries was established as a US division in Miami and operated until 1986. In 2010, the RG brand was acquired by Umarex GmbH ...

  5. R. G. LeTourneau - Wikipedia

    en.wikipedia.org/wiki/R._G._LeTourneau

    Robert Gilmour "R. G." LeTourneau (/ lətˈərnoʊ /; November 30, 1888 – June 1, 1969), born in Richford, Vermont, was a prolific inventor of technologies related to earthmoving machinery, and founder of LeTourneau Technologies and LeTourneau University. [1] His factories supplied machinery which represented nearly 75 percent of the ...

  6. Crack growth resistance curve - Wikipedia

    en.wikipedia.org/wiki/Crack_growth_resistance_curve

    Crack growth resistance curve. In fracture mechanics, a crack growth resistance curve shows the energy required for crack extension as a function of crack length in a given material. For materials that can be modeled with linear elastic fracture mechanics (LEFM), crack extension occurs when the applied energy release rate exceeds the material's ...

  7. Universality class - Wikipedia

    en.wikipedia.org/wiki/Universality_class

    Universality class. In statistical mechanics, a universality class is a collection of mathematical models which share a single scale-invariant limit under the process of renormalization group flow. While the models within a class may differ dramatically at finite scales, their behavior will become increasingly similar as the limit scale is ...

  8. Functional renormalization group - Wikipedia

    en.wikipedia.org/wiki/Functional_renormalization...

    Functional renormalization group. In theoretical physics, functional renormalization group (FRG) is an implementation of the renormalization group (RG) concept which is used in quantum and statistical field theory, especially when dealing with strongly interacting systems. The method combines functional methods of quantum field theory with the ...

  9. Mechanics - Wikipedia

    en.wikipedia.org/wiki/Mechanics

    Mechanics (from Ancient Greek: μηχανική, mēkhanikḗ, lit. "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 result in displacements, which are changes of an object's position relative to its environment.

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