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  2. Air preheater - Wikipedia

    en.wikipedia.org/wiki/Air_preheater

    The heating plate elements in this type of regenerative air preheater are also installed in a casing, but the heating plate elements are stationary rather than rotating. Instead the air ducts in the preheater are rotated so as to alternatively expose sections of the heating plate elements to the upflowing cool air. [1] [2] [3]

  3. Point groups in two dimensions - Wikipedia

    en.wikipedia.org/wiki/Point_groups_in_two_dimensions

    The 2D symmetry groups correspond to the isometry groups, except that symmetry according to O(2) and SO(2) can only be distinguished in the generalized symmetry concept applicable for vector fields. Also, depending on application, homogeneity up to arbitrarily fine detail in transverse direction may be considered equivalent to full homogeneity ...

  4. Planar Systems - Wikipedia

    en.wikipedia.org/wiki/Planar_Systems

    In November 2012, Planar announced the sale of its electroluminescent business to Beneq Oy, a supplier of production and research equipment for thin film coatings. Under the terms of the transaction, consideration consists of a $6.5 million base purchase price, of which $3.9 million was paid in cash at closing and $2.6 million was paid in the ...

  5. List of planar symmetry groups - Wikipedia

    en.wikipedia.org/wiki/List_of_planar_symmetry_groups

    The 17 wallpaper groups, with finite fundamental domains, are given by International notation, orbifold notation, and Coxeter notation, classified by the 5 Bravais lattices in the plane: square, oblique (parallelogrammatic), hexagonal (equilateral triangular), rectangular (centered rhombic), and rhombic (centered rectangular).

  6. Planar chirality - Wikipedia

    en.wikipedia.org/wiki/Planar_chirality

    Planar chirality, also known as 2D chirality, is the special case of chirality for two dimensions. Most fundamentally, planar chirality is a mathematical term, finding use in chemistry , physics and related physical sciences, for example, in astronomy , optics and metamaterials .

  7. Air-start system - Wikipedia

    en.wikipedia.org/wiki/Air-start_system

    All vane type air starters should have a lubricator installed to insure long-life and maximum performance. [4] Lubricators give the moving parts a needed friction barrier, reduce metal corrosion and keep vanes sealed properly against the cylinder walls. Even the so-called lube-free air starters require lubrication to prolong trouble free life.

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