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  2. Slab-grave culture - Wikipedia

    en.wikipedia.org/wiki/Slab-grave_culture

    [24] [25] The predominant Y-DNA haplogroup in Slab Grave males has been identified as Q (5/8 Q-M120 and 1/8 Q-L330), with a minority belonging to N-M231 (2/8). [ 26 ] The transition from the Slab Grave culture period to the Xiongnu period was characterized as a massive increase of West Eurasian paternal ancestry, rising from 0% to 46%, which ...

  3. Marcus' method - Wikipedia

    en.wikipedia.org/wiki/Marcus'_method

    The method was developed by Henri Marcus and described in 1938 in Die Theorie elastischer Gewebe und ihre Anwendung auf die Berechnung biegsamer Platten. [1] The method adapts the strip method and is based on an elastic analysis of torsionally restrained two-way rectangular slabs with a uniformly distributed load.

  4. Jet engine performance - Wikipedia

    en.wikipedia.org/wiki/Jet_engine_performance

    The type of jet engine used to explain the conversion of fuel into thrust is the ramjet.It is simpler than the turbojet which is, in turn, simpler than the turbofan.It is valid to use the ramjet example because the ramjet, turbojet and turbofan core all use the same principle to produce thrust which is to accelerate the air passing through them.

  5. Extended periodic table - Wikipedia

    en.wikipedia.org/wiki/Extended_periodic_table

    It is not clear how many elements beyond the expected island of stability are physically possible, whether period 8 is complete, or if there is a period 9. The International Union of Pure and Applied Chemistry (IUPAC) defines an element to exist if its lifetime is longer than 10 −14 seconds (0.01 picoseconds, or 10 femtoseconds), which is the ...

  6. List of Mikoyan-Gurevich MiG-21 variants - Wikipedia

    en.wikipedia.org/wiki/List_of_Mikoyan-Gurevich...

    MiG-21PF (1961; Izdeliye 76; NATO "Fishbed-D") P = Perekhvatchik ("Interceptor"), F = Forsirovannyy ("Uprated") Production version of the all-weather interceptor. These were powered by the R11F2-300 turbojet and, starting with the seventh production batch, fitted with the RP-21 radar (the first six batches used the older TsD-30T radar (aka RP-9-21).

  7. Water jet cutter - Wikipedia

    en.wikipedia.org/wiki/Water_jet_cutter

    The term abrasive jet refers specifically to the use of a mixture of water and an abrasive to cut hard materials such as metal, stone or glass, while the terms pure waterjet and water-only cutting refer to waterjet cutting without the use of added abrasives, often used for softer materials such as wood or rubber. [1]

  8. Museum of Orenburg History - Wikipedia

    en.wikipedia.org/wiki/Museum_of_Orenburg_History

    The collection of tableware includes porcelain from the Kuznetsov porcelain and faience factory, silver tableware, pseudo-Russian style faience and glass from the Maltsov factories. There is also clothing from the time period (handmade openwork women's jackets, corsets, men's dickeys, silk handkerchiefs, shoes, etc.) [19]

  9. Period (periodic table) - Wikipedia

    en.wikipedia.org/wiki/Period_(periodic_table)

    In the periodic table of the elements, each numbered row is a period. A period on the periodic table is a row of chemical elements. All elements in a row have the same number of electron shells. Each next element in a period has one more proton and is less metallic than its predecessor.