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The first known popular example in the "falling-sand" genre was a web-based Java applet on the Japanese Dofi-Blog in 2005 [3] [4] which was later expanded and rehosted as the "Falling sand game", [4] which kick-started the genre as a trend and gave it its name. [5] [6]
The stoichiometric ratio is 34.2% aluminum and 65.8% perchlorate by mass. A ratio of seven parts potassium perchlorate to three parts dark pyro aluminium is the composition used by most pyrotechnicians. For best results, the aluminium powder should be "Dark Pyro" grade, with a flake particle shape, and a particle size of fewer than 10 micrometres.
Thermite may be used for repair by the welding in-place of thick steel sections such as locomotive axle-frames where the repair can take place without removing the part from its installed location. [38] Thermite can be used for quickly cutting or welding steel such as rail tracks, without requiring complex or heavy equipment.
Java, Indonesia Sunda Shelf: H. erectus (associated) Hominin remains, shell tool cut marks on bone Socotra Island [47] 2.5–1.4 Socotra Island: Indian Ocean: H. erectus (presumed) Stone tools Oldowan stone tools. May very well be earliest evidence of seafaring. Kozarnika, Dimovo Municipality [48] 1.4-1.6 Bulgaria Eastern Europe H. erectus ...
Pyrometallurgy is a branch of extractive metallurgy.It consists of the thermal treatment of minerals and metallurgical ores and concentrates to bring about physical and chemical transformations in the materials to enable recovery of valuable metals. [1]
Pyrotechnic gerbs used in the entertainment industry. Pyrotechnics is the science and craft of creating such things as fireworks, safety matches, oxygen candles, explosive bolts and other fasteners, parts of automotive airbags, as well as gas-pressure blasting in mining, quarrying, and demolition.
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Alternate spellings and abbreviations for cumulonimbus flammagenitus that may be found in the literature include Cb-Fg, pyrocumulonimbus, pyro-cumulonimbus, pyroCb, pyro-Cb, pyrocb, and volcanic cb, having developed amongst different specialist groups [8] [20] In the media and in public communications, fire-driven examples are often referred to as fires 'making their own weather'.