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  2. Surface reconstruction - Wikipedia

    en.wikipedia.org/wiki/Surface_reconstruction

    The Si (111) structure, by comparison, exhibits a much more complex reconstruction. Cleavage along the (111) surface at low temperatures results in another 2×1 reconstruction, differing from the (100) surface by forming long π-bonded chains in the first and second surface layers. However, when heated above 400 °C, this structure converts ...

  3. Clay mineral X-ray diffraction - Wikipedia

    en.wikipedia.org/wiki/Clay_Mineral_X-Ray_Diffraction

    Typically, powder X-ray diffraction (XRD) is an average of randomly oriented microcrystals that should equally represent all crystal orientation if a large enough sample is present. X-rays are directed at the sample while slowly rotated that produce a diffraction pattern that shows intensity of x-rays collected at different angles. Randomly ...

  4. Obiekt 279 - Wikipedia

    en.wikipedia.org/wiki/Obiekt_279

    The Obiekt 279, or Object 279, (Объект 279) was a Soviet experimental heavy tank developed at the end of 1959. This special purpose tank was intended to fight on cross country terrain, inaccessible to conventional tanks, acting as a heavy breakthrough tank. It was planned as a tank of the Supreme Command Reserve. [citation needed]

  5. X-ray crystallography - Wikipedia

    en.wikipedia.org/wiki/X-ray_crystallography

    A powder X-ray diffractometer in motion. X-ray crystallography is the experimental science of determining the atomic and molecular structure of a crystal, in which the crystalline structure causes a beam of incident X-rays to diffract in specific directions.

  6. X-ray fluorescence - Wikipedia

    en.wikipedia.org/wiki/X-ray_fluorescence

    X-ray diffraction (XRD) is still the most used method for structural analysis of chemical compounds. Yet, with increasing detail on the relation of K β {\displaystyle K_{\beta }} -line spectra and the surrounding chemical environment of the ionized metal atom, measurements of the so-called valence-to-core (V2C) energy region become ...

  7. Tanks of Czechoslovakia - Wikipedia

    en.wikipedia.org/wiki/Tanks_of_Czechoslovakia

    This article deals with the history of tanks employed by military forces in Czechoslovakia from the interwar period, and the more conventional tanks designed for the Czechoslovak Army before World War II, and the tanks that ended up as Panzers of the German Wehrmacht during World War II, or in the use of other countries who purchased them before the war began.

  8. What are angel numbers? Why numbers like 111 and 222 are ...

    www.aol.com/news/angel-numbers-why-numbers-111...

    Here's a breakdown of the numerology and the meaning of numbers like 111, 222, 333, 444, 555, 666, 777, and so on. Why numbers like 111 and 222 are considered good luck Skip to main content

  9. 111th Tank Division (Soviet Union) - Wikipedia

    en.wikipedia.org/wiki/111th_Tank_Division...

    The 111th Tank Division was a Tank division of the Soviet Union's Red Army and after 1946, the Soviet Army. The division was formed in the summer of 1941 in the Soviet Far East from the tank regiment of a motorized division that had been reorganized into a motor rifle division, and had thus lost its tank regiment.