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  2. Wind profile power law - Wikipedia

    en.wikipedia.org/wiki/Wind_profile_power_law

    The power law is often used in wind power assessments [4] [5] where wind speeds at the height of a turbine ( 50 metres) must be estimated from near surface wind observations (~10 metres), or where wind speed data at various heights must be adjusted to a standard height [6] prior to use.

  3. French aircraft carrier Béarn - Wikipedia

    en.wikipedia.org/wiki/French_aircraft_carrier_Béarn

    The original waterline belt armor of the Normandie-class battleships was totally inappropriate for Béarn ' s new role as an aircraft carrier and was replaced by a thinner, but much deeper belt of 83-millimeter (3.3 in) non-cemented armor that extended from 2.35 m (7 ft 9 in) above the waterline to 3.124 m (10 ft 3 in) below it. The lower ...

  4. SMS Gefion - Wikipedia

    en.wikipedia.org/wiki/SMS_Gefion

    The German fleet in the 1890s; visible are Sachsen-class ironclads, a Wacht-class aviso, and a Bismarck-class corvette. In the mid-1880s, the German Kaiserliche Marine (Imperial Navy) had begun a program of construction to modernize its cruiser force, beginning with the Irene class of protected cruisers of 1886, followed the Schwalbe-class unprotected cruisers in 1886–1887 and Kaiserin ...

  5. Surface (topology) - Wikipedia

    en.wikipedia.org/wiki/Surface_(topology)

    The term surface used without qualification refers to surfaces without boundary. In particular, a surface with empty boundary is a surface in the usual sense. A surface with empty boundary which is compact is known as a 'closed' surface. The two-dimensional sphere, the two-dimensional torus, and the real projective plane are examples of closed ...

  6. Surface tension - Wikipedia

    en.wikipedia.org/wiki/Surface_tension

    Surface tension is the tendency of liquid surfaces at rest to shrink into the minimum surface area possible. Surface tension is what allows objects with a higher density than water such as razor blades and insects (e.g. water striders) to float on a water surface without becoming even partly submerged.

  7. Surface (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Surface_(mathematics)

    A sphere is the surface of a solid ball, here having radius r. In mathematics, a surface is a mathematical model of the common concept of a surface.It is a generalization of a plane, but, unlike a plane, it may be curved; this is analogous to a curve generalizing a straight line.

  8. Soviet Union - Wikipedia

    en.wikipedia.org/wiki/Soviet_Union

    The Union of Soviet Socialist Republics [t] (USSR), [u] commonly known as the Soviet Union, [v] was a transcontinental country that spanned much of Eurasia from 1922 to 1991. . During its existence, it was the largest country by area, extending across eleven time zones and sharing borders with twelve countries, and the third-most populous co

  9. HAL Tejas - Wikipedia

    en.wikipedia.org/wiki/HAL_Tejas

    [10] [11] Tejas made its first flight in 2001 and entered into service with the IAF in 2015. [12] [13] In 2003, the aircraft was officially named 'Tejas'. [14] Currently, Tejas is the smallest and lightest in its class of supersonic combat aircraft. [15] Tejas is the second jet powered combat aircraft developed by HAL after the HF-24 Marut. [16]