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  2. Singleton pattern - Wikipedia

    en.wikipedia.org/wiki/Singleton_pattern

    In object-oriented programming, the singleton pattern is a software design pattern that restricts the instantiation of a class to a singular instance. It is one of the well-known "Gang of Four" design patterns , which describe how to solve recurring problems in object-oriented software. [ 1 ]

  3. Template:Locomotive design - Wikipedia

    en.wikipedia.org/wiki/Template:Locomotive_design

    This template's initial visibility currently defaults to autocollapse, meaning that if there is another collapsible item on the page (a navbox, sidebar, or table with the collapsible attribute), it is hidden apart from its title bar; if not, it is fully visible. To change this template's initial visibility, the |state= parameter may be used:

  4. Standard Model - Wikipedia

    en.wikipedia.org/wiki/Standard_Model

    The electroweak sector is a Yang–Mills gauge theory with the symmetry group U(1) × SU(2) L, = ¯ + ¯ + ¯ + ¯ + ¯, where the subscript sums over the three generations of fermions; ,, and are the left-handed doublet, right-handed singlet up type, and right handed singlet down type quark fields; and and are the left-handed doublet and right ...

  5. Singlet state - Wikipedia

    en.wikipedia.org/wiki/Singlet_state

    The ability of positronium to form both singlet and triplet states is described mathematically by saying that the product of two doublet representations (meaning the electron and positron, which are both spin-1/2 doublets) can be decomposed into the sum of an adjoint representation (the triplet or spin 1 state) and a trivial representation (the ...

  6. Singlet fission - Wikipedia

    en.wikipedia.org/wiki/Singlet_fission

    Singlet fission is a spin-allowed process, unique to molecular photophysics, whereby one singlet excited state is converted into two triplet states.The phenomenon has been observed in molecular crystals, aggregates, disordered thin films, and covalently-linked dimers, where the chromophores are oriented such that the electronic coupling between singlet and the double triplet states is large.

  7. Quark model - Wikipedia

    en.wikipedia.org/wiki/Quark_model

    Figure 2: Pseudoscalar mesons of spin-0 form a nonet Figure 3: Vector mesons of spin-1 form a nonet. The Eightfold Way classification is named after the following fact: If we take three flavors of quarks, then the quarks lie in the fundamental representation, 3 (called the triplet) of flavor SU(3).

  8. Devin Singletary - Wikipedia

    en.wikipedia.org/wiki/Devin_Singletary

    Singletary scored his first touchdown of the season in week 2 against the Miami Dolphins, a 46-yard run, in which he reached a top speed of 20.29 miles per hour according to NFL NextGen Stats. His touchdown was the first for Buffalo in the game, as the Bills wound up winning 35–0. [ 27 ]

  9. Powerlifting - Wikipedia

    en.wikipedia.org/wiki/Powerlifting

    Powerlifting is a competitive strength sport that consists of three attempts at maximal weight on three lifts: squat, bench press, and deadlift.As in the sport of Olympic weightlifting, it involves the athlete attempting a maximal weight single-lift effort of a barbell loaded with weight plates.